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929be906 | 1 | // SPDX-License-Identifier: LGPL-2.1 |
1da177e4 | 2 | /* |
1da177e4 LT |
3 | * |
4 | * vfs operations that deal with files | |
fb8c4b14 | 5 | * |
f19159dc | 6 | * Copyright (C) International Business Machines Corp., 2002,2010 |
1da177e4 | 7 | * Author(s): Steve French (sfrench@us.ibm.com) |
7ee1af76 | 8 | * Jeremy Allison (jra@samba.org) |
1da177e4 | 9 | * |
1da177e4 LT |
10 | */ |
11 | #include <linux/fs.h> | |
37c0eb46 | 12 | #include <linux/backing-dev.h> |
1da177e4 LT |
13 | #include <linux/stat.h> |
14 | #include <linux/fcntl.h> | |
15 | #include <linux/pagemap.h> | |
16 | #include <linux/pagevec.h> | |
37c0eb46 | 17 | #include <linux/writeback.h> |
6f88cc2e | 18 | #include <linux/task_io_accounting_ops.h> |
23e7dd7d | 19 | #include <linux/delay.h> |
3bc303c2 | 20 | #include <linux/mount.h> |
5a0e3ad6 | 21 | #include <linux/slab.h> |
690c5e31 | 22 | #include <linux/swap.h> |
f86196ea | 23 | #include <linux/mm.h> |
1da177e4 LT |
24 | #include <asm/div64.h> |
25 | #include "cifsfs.h" | |
26 | #include "cifspdu.h" | |
27 | #include "cifsglob.h" | |
28 | #include "cifsproto.h" | |
fb157ed2 | 29 | #include "smb2proto.h" |
1da177e4 LT |
30 | #include "cifs_unicode.h" |
31 | #include "cifs_debug.h" | |
32 | #include "cifs_fs_sb.h" | |
9451a9a5 | 33 | #include "fscache.h" |
bd3dcc6a | 34 | #include "smbdirect.h" |
8401e936 | 35 | #include "fs_context.h" |
087f757b | 36 | #include "cifs_ioctl.h" |
05b98fd2 | 37 | #include "cached_dir.h" |
07b92d0d | 38 | |
fb157ed2 SF |
39 | /* |
40 | * Mark as invalid, all open files on tree connections since they | |
41 | * were closed when session to server was lost. | |
42 | */ | |
43 | void | |
44 | cifs_mark_open_files_invalid(struct cifs_tcon *tcon) | |
45 | { | |
46 | struct cifsFileInfo *open_file = NULL; | |
47 | struct list_head *tmp; | |
48 | struct list_head *tmp1; | |
49 | ||
50 | /* only send once per connect */ | |
51 | spin_lock(&tcon->ses->ses_lock); | |
52 | if ((tcon->ses->ses_status != SES_GOOD) || (tcon->status != TID_NEED_RECON)) { | |
53 | spin_unlock(&tcon->ses->ses_lock); | |
54 | return; | |
55 | } | |
56 | tcon->status = TID_IN_FILES_INVALIDATE; | |
57 | spin_unlock(&tcon->ses->ses_lock); | |
58 | ||
59 | /* list all files open on tree connection and mark them invalid */ | |
60 | spin_lock(&tcon->open_file_lock); | |
61 | list_for_each_safe(tmp, tmp1, &tcon->openFileList) { | |
62 | open_file = list_entry(tmp, struct cifsFileInfo, tlist); | |
63 | open_file->invalidHandle = true; | |
64 | open_file->oplock_break_cancelled = true; | |
65 | } | |
66 | spin_unlock(&tcon->open_file_lock); | |
67 | ||
05b98fd2 | 68 | invalidate_all_cached_dirs(tcon); |
fb157ed2 SF |
69 | spin_lock(&tcon->tc_lock); |
70 | if (tcon->status == TID_IN_FILES_INVALIDATE) | |
71 | tcon->status = TID_NEED_TCON; | |
72 | spin_unlock(&tcon->tc_lock); | |
73 | ||
74 | /* | |
75 | * BB Add call to invalidate_inodes(sb) for all superblocks mounted | |
76 | * to this tcon. | |
77 | */ | |
78 | } | |
79 | ||
1da177e4 LT |
80 | static inline int cifs_convert_flags(unsigned int flags) |
81 | { | |
82 | if ((flags & O_ACCMODE) == O_RDONLY) | |
83 | return GENERIC_READ; | |
84 | else if ((flags & O_ACCMODE) == O_WRONLY) | |
85 | return GENERIC_WRITE; | |
86 | else if ((flags & O_ACCMODE) == O_RDWR) { | |
87 | /* GENERIC_ALL is too much permission to request | |
88 | can cause unnecessary access denied on create */ | |
89 | /* return GENERIC_ALL; */ | |
90 | return (GENERIC_READ | GENERIC_WRITE); | |
91 | } | |
92 | ||
e10f7b55 JL |
93 | return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES | |
94 | FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA | | |
95 | FILE_READ_DATA); | |
7fc8f4e9 | 96 | } |
e10f7b55 | 97 | |
fb157ed2 | 98 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
608712fe | 99 | static u32 cifs_posix_convert_flags(unsigned int flags) |
7fc8f4e9 | 100 | { |
608712fe | 101 | u32 posix_flags = 0; |
e10f7b55 | 102 | |
7fc8f4e9 | 103 | if ((flags & O_ACCMODE) == O_RDONLY) |
608712fe | 104 | posix_flags = SMB_O_RDONLY; |
7fc8f4e9 | 105 | else if ((flags & O_ACCMODE) == O_WRONLY) |
608712fe JL |
106 | posix_flags = SMB_O_WRONLY; |
107 | else if ((flags & O_ACCMODE) == O_RDWR) | |
108 | posix_flags = SMB_O_RDWR; | |
109 | ||
07b92d0d | 110 | if (flags & O_CREAT) { |
608712fe | 111 | posix_flags |= SMB_O_CREAT; |
07b92d0d SF |
112 | if (flags & O_EXCL) |
113 | posix_flags |= SMB_O_EXCL; | |
114 | } else if (flags & O_EXCL) | |
f96637be JP |
115 | cifs_dbg(FYI, "Application %s pid %d has incorrectly set O_EXCL flag but not O_CREAT on file open. Ignoring O_EXCL\n", |
116 | current->comm, current->tgid); | |
07b92d0d | 117 | |
608712fe JL |
118 | if (flags & O_TRUNC) |
119 | posix_flags |= SMB_O_TRUNC; | |
120 | /* be safe and imply O_SYNC for O_DSYNC */ | |
6b2f3d1f | 121 | if (flags & O_DSYNC) |
608712fe | 122 | posix_flags |= SMB_O_SYNC; |
7fc8f4e9 | 123 | if (flags & O_DIRECTORY) |
608712fe | 124 | posix_flags |= SMB_O_DIRECTORY; |
7fc8f4e9 | 125 | if (flags & O_NOFOLLOW) |
608712fe | 126 | posix_flags |= SMB_O_NOFOLLOW; |
7fc8f4e9 | 127 | if (flags & O_DIRECT) |
608712fe | 128 | posix_flags |= SMB_O_DIRECT; |
7fc8f4e9 SF |
129 | |
130 | return posix_flags; | |
1da177e4 | 131 | } |
fb157ed2 | 132 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
1da177e4 LT |
133 | |
134 | static inline int cifs_get_disposition(unsigned int flags) | |
135 | { | |
136 | if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL)) | |
137 | return FILE_CREATE; | |
138 | else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC)) | |
139 | return FILE_OVERWRITE_IF; | |
140 | else if ((flags & O_CREAT) == O_CREAT) | |
141 | return FILE_OPEN_IF; | |
55aa2e09 SF |
142 | else if ((flags & O_TRUNC) == O_TRUNC) |
143 | return FILE_OVERWRITE; | |
1da177e4 LT |
144 | else |
145 | return FILE_OPEN; | |
146 | } | |
147 | ||
fb157ed2 | 148 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
f6f1f179 | 149 | int cifs_posix_open(const char *full_path, struct inode **pinode, |
608712fe | 150 | struct super_block *sb, int mode, unsigned int f_flags, |
6d5786a3 | 151 | __u32 *poplock, __u16 *pnetfid, unsigned int xid) |
608712fe JL |
152 | { |
153 | int rc; | |
154 | FILE_UNIX_BASIC_INFO *presp_data; | |
155 | __u32 posix_flags = 0; | |
156 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
157 | struct cifs_fattr fattr; | |
158 | struct tcon_link *tlink; | |
96daf2b0 | 159 | struct cifs_tcon *tcon; |
608712fe | 160 | |
f96637be | 161 | cifs_dbg(FYI, "posix open %s\n", full_path); |
608712fe JL |
162 | |
163 | presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL); | |
164 | if (presp_data == NULL) | |
165 | return -ENOMEM; | |
166 | ||
167 | tlink = cifs_sb_tlink(cifs_sb); | |
168 | if (IS_ERR(tlink)) { | |
169 | rc = PTR_ERR(tlink); | |
170 | goto posix_open_ret; | |
171 | } | |
172 | ||
173 | tcon = tlink_tcon(tlink); | |
174 | mode &= ~current_umask(); | |
175 | ||
176 | posix_flags = cifs_posix_convert_flags(f_flags); | |
177 | rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data, | |
178 | poplock, full_path, cifs_sb->local_nls, | |
bc8ebdc4 | 179 | cifs_remap(cifs_sb)); |
608712fe JL |
180 | cifs_put_tlink(tlink); |
181 | ||
182 | if (rc) | |
183 | goto posix_open_ret; | |
184 | ||
185 | if (presp_data->Type == cpu_to_le32(-1)) | |
186 | goto posix_open_ret; /* open ok, caller does qpathinfo */ | |
187 | ||
188 | if (!pinode) | |
189 | goto posix_open_ret; /* caller does not need info */ | |
190 | ||
191 | cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb); | |
192 | ||
193 | /* get new inode and set it up */ | |
194 | if (*pinode == NULL) { | |
195 | cifs_fill_uniqueid(sb, &fattr); | |
196 | *pinode = cifs_iget(sb, &fattr); | |
197 | if (!*pinode) { | |
198 | rc = -ENOMEM; | |
199 | goto posix_open_ret; | |
200 | } | |
201 | } else { | |
cee8f4f6 | 202 | cifs_revalidate_mapping(*pinode); |
4d66952a | 203 | rc = cifs_fattr_to_inode(*pinode, &fattr); |
608712fe JL |
204 | } |
205 | ||
206 | posix_open_ret: | |
207 | kfree(presp_data); | |
208 | return rc; | |
209 | } | |
fb157ed2 | 210 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
608712fe | 211 | |
eeb910a6 | 212 | static int |
f6f1f179 | 213 | cifs_nt_open(const char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb, |
fb1214e4 PS |
214 | struct cifs_tcon *tcon, unsigned int f_flags, __u32 *oplock, |
215 | struct cifs_fid *fid, unsigned int xid) | |
eeb910a6 PS |
216 | { |
217 | int rc; | |
fb1214e4 | 218 | int desired_access; |
eeb910a6 | 219 | int disposition; |
3d3ea8e6 | 220 | int create_options = CREATE_NOT_DIR; |
eeb910a6 | 221 | FILE_ALL_INFO *buf; |
b8c32dbb | 222 | struct TCP_Server_Info *server = tcon->ses->server; |
226730b4 | 223 | struct cifs_open_parms oparms; |
eeb910a6 | 224 | |
b8c32dbb | 225 | if (!server->ops->open) |
fb1214e4 PS |
226 | return -ENOSYS; |
227 | ||
228 | desired_access = cifs_convert_flags(f_flags); | |
eeb910a6 PS |
229 | |
230 | /********************************************************************* | |
231 | * open flag mapping table: | |
232 | * | |
233 | * POSIX Flag CIFS Disposition | |
234 | * ---------- ---------------- | |
235 | * O_CREAT FILE_OPEN_IF | |
236 | * O_CREAT | O_EXCL FILE_CREATE | |
237 | * O_CREAT | O_TRUNC FILE_OVERWRITE_IF | |
238 | * O_TRUNC FILE_OVERWRITE | |
239 | * none of the above FILE_OPEN | |
240 | * | |
241 | * Note that there is not a direct match between disposition | |
242 | * FILE_SUPERSEDE (ie create whether or not file exists although | |
243 | * O_CREAT | O_TRUNC is similar but truncates the existing | |
244 | * file rather than creating a new file as FILE_SUPERSEDE does | |
245 | * (which uses the attributes / metadata passed in on open call) | |
246 | *? | |
247 | *? O_SYNC is a reasonable match to CIFS writethrough flag | |
248 | *? and the read write flags match reasonably. O_LARGEFILE | |
249 | *? is irrelevant because largefile support is always used | |
250 | *? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY, | |
251 | * O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation | |
252 | *********************************************************************/ | |
253 | ||
254 | disposition = cifs_get_disposition(f_flags); | |
255 | ||
256 | /* BB pass O_SYNC flag through on file attributes .. BB */ | |
257 | ||
258 | buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); | |
259 | if (!buf) | |
260 | return -ENOMEM; | |
261 | ||
1013e760 SF |
262 | /* O_SYNC also has bit for O_DSYNC so following check picks up either */ |
263 | if (f_flags & O_SYNC) | |
264 | create_options |= CREATE_WRITE_THROUGH; | |
265 | ||
266 | if (f_flags & O_DIRECT) | |
267 | create_options |= CREATE_NO_BUFFER; | |
268 | ||
226730b4 PS |
269 | oparms.tcon = tcon; |
270 | oparms.cifs_sb = cifs_sb; | |
271 | oparms.desired_access = desired_access; | |
0f060936 | 272 | oparms.create_options = cifs_create_options(cifs_sb, create_options); |
226730b4 PS |
273 | oparms.disposition = disposition; |
274 | oparms.path = full_path; | |
275 | oparms.fid = fid; | |
9cbc0b73 | 276 | oparms.reconnect = false; |
226730b4 PS |
277 | |
278 | rc = server->ops->open(xid, &oparms, oplock, buf); | |
eeb910a6 PS |
279 | |
280 | if (rc) | |
281 | goto out; | |
282 | ||
d313852d | 283 | /* TODO: Add support for calling posix query info but with passing in fid */ |
eeb910a6 PS |
284 | if (tcon->unix_ext) |
285 | rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb, | |
286 | xid); | |
287 | else | |
288 | rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb, | |
42eacf9e | 289 | xid, fid); |
eeb910a6 | 290 | |
30573a82 PS |
291 | if (rc) { |
292 | server->ops->close(xid, tcon, fid); | |
293 | if (rc == -ESTALE) | |
294 | rc = -EOPENSTALE; | |
295 | } | |
296 | ||
eeb910a6 PS |
297 | out: |
298 | kfree(buf); | |
299 | return rc; | |
300 | } | |
301 | ||
63b7d3a4 PS |
302 | static bool |
303 | cifs_has_mand_locks(struct cifsInodeInfo *cinode) | |
304 | { | |
305 | struct cifs_fid_locks *cur; | |
306 | bool has_locks = false; | |
307 | ||
308 | down_read(&cinode->lock_sem); | |
309 | list_for_each_entry(cur, &cinode->llist, llist) { | |
310 | if (!list_empty(&cur->locks)) { | |
311 | has_locks = true; | |
312 | break; | |
313 | } | |
314 | } | |
315 | up_read(&cinode->lock_sem); | |
316 | return has_locks; | |
317 | } | |
318 | ||
d46b0da7 DW |
319 | void |
320 | cifs_down_write(struct rw_semaphore *sem) | |
321 | { | |
322 | while (!down_write_trylock(sem)) | |
323 | msleep(10); | |
324 | } | |
325 | ||
32546a95 RS |
326 | static void cifsFileInfo_put_work(struct work_struct *work); |
327 | ||
15ecb436 | 328 | struct cifsFileInfo * |
fb1214e4 | 329 | cifs_new_fileinfo(struct cifs_fid *fid, struct file *file, |
15ecb436 JL |
330 | struct tcon_link *tlink, __u32 oplock) |
331 | { | |
1f1735cb | 332 | struct dentry *dentry = file_dentry(file); |
2b0143b5 | 333 | struct inode *inode = d_inode(dentry); |
4b4de76e PS |
334 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
335 | struct cifsFileInfo *cfile; | |
f45d3416 | 336 | struct cifs_fid_locks *fdlocks; |
233839b1 | 337 | struct cifs_tcon *tcon = tlink_tcon(tlink); |
63b7d3a4 | 338 | struct TCP_Server_Info *server = tcon->ses->server; |
4b4de76e PS |
339 | |
340 | cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL); | |
341 | if (cfile == NULL) | |
342 | return cfile; | |
343 | ||
f45d3416 PS |
344 | fdlocks = kzalloc(sizeof(struct cifs_fid_locks), GFP_KERNEL); |
345 | if (!fdlocks) { | |
346 | kfree(cfile); | |
347 | return NULL; | |
348 | } | |
349 | ||
350 | INIT_LIST_HEAD(&fdlocks->locks); | |
351 | fdlocks->cfile = cfile; | |
352 | cfile->llist = fdlocks; | |
f45d3416 | 353 | |
4b4de76e | 354 | cfile->count = 1; |
4b4de76e PS |
355 | cfile->pid = current->tgid; |
356 | cfile->uid = current_fsuid(); | |
357 | cfile->dentry = dget(dentry); | |
358 | cfile->f_flags = file->f_flags; | |
359 | cfile->invalidHandle = false; | |
860b69a9 | 360 | cfile->deferred_close_scheduled = false; |
4b4de76e | 361 | cfile->tlink = cifs_get_tlink(tlink); |
4b4de76e | 362 | INIT_WORK(&cfile->oplock_break, cifs_oplock_break); |
32546a95 | 363 | INIT_WORK(&cfile->put, cifsFileInfo_put_work); |
c3f207ab | 364 | INIT_DELAYED_WORK(&cfile->deferred, smb2_deferred_work_close); |
f45d3416 | 365 | mutex_init(&cfile->fh_mutex); |
3afca265 | 366 | spin_lock_init(&cfile->file_info_lock); |
15ecb436 | 367 | |
24261fc2 MG |
368 | cifs_sb_active(inode->i_sb); |
369 | ||
63b7d3a4 PS |
370 | /* |
371 | * If the server returned a read oplock and we have mandatory brlocks, | |
372 | * set oplock level to None. | |
373 | */ | |
53ef1016 | 374 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { |
f96637be | 375 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); |
63b7d3a4 PS |
376 | oplock = 0; |
377 | } | |
378 | ||
6f582b27 PS |
379 | cifs_down_write(&cinode->lock_sem); |
380 | list_add(&fdlocks->llist, &cinode->llist); | |
381 | up_write(&cinode->lock_sem); | |
382 | ||
3afca265 | 383 | spin_lock(&tcon->open_file_lock); |
63b7d3a4 | 384 | if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock) |
233839b1 PS |
385 | oplock = fid->pending_open->oplock; |
386 | list_del(&fid->pending_open->olist); | |
387 | ||
42873b0a | 388 | fid->purge_cache = false; |
63b7d3a4 | 389 | server->ops->set_fid(cfile, fid, oplock); |
233839b1 PS |
390 | |
391 | list_add(&cfile->tlist, &tcon->openFileList); | |
fae8044c | 392 | atomic_inc(&tcon->num_local_opens); |
3afca265 | 393 | |
15ecb436 | 394 | /* if readable file instance put first in list*/ |
487317c9 | 395 | spin_lock(&cinode->open_file_lock); |
15ecb436 | 396 | if (file->f_mode & FMODE_READ) |
4b4de76e | 397 | list_add(&cfile->flist, &cinode->openFileList); |
15ecb436 | 398 | else |
4b4de76e | 399 | list_add_tail(&cfile->flist, &cinode->openFileList); |
487317c9 | 400 | spin_unlock(&cinode->open_file_lock); |
3afca265 | 401 | spin_unlock(&tcon->open_file_lock); |
15ecb436 | 402 | |
42873b0a | 403 | if (fid->purge_cache) |
4f73c7d3 | 404 | cifs_zap_mapping(inode); |
42873b0a | 405 | |
4b4de76e PS |
406 | file->private_data = cfile; |
407 | return cfile; | |
15ecb436 JL |
408 | } |
409 | ||
764a1b1a JL |
410 | struct cifsFileInfo * |
411 | cifsFileInfo_get(struct cifsFileInfo *cifs_file) | |
412 | { | |
3afca265 | 413 | spin_lock(&cifs_file->file_info_lock); |
764a1b1a | 414 | cifsFileInfo_get_locked(cifs_file); |
3afca265 | 415 | spin_unlock(&cifs_file->file_info_lock); |
764a1b1a JL |
416 | return cifs_file; |
417 | } | |
418 | ||
32546a95 RS |
419 | static void cifsFileInfo_put_final(struct cifsFileInfo *cifs_file) |
420 | { | |
421 | struct inode *inode = d_inode(cifs_file->dentry); | |
422 | struct cifsInodeInfo *cifsi = CIFS_I(inode); | |
423 | struct cifsLockInfo *li, *tmp; | |
424 | struct super_block *sb = inode->i_sb; | |
425 | ||
426 | /* | |
427 | * Delete any outstanding lock records. We'll lose them when the file | |
428 | * is closed anyway. | |
429 | */ | |
430 | cifs_down_write(&cifsi->lock_sem); | |
431 | list_for_each_entry_safe(li, tmp, &cifs_file->llist->locks, llist) { | |
432 | list_del(&li->llist); | |
433 | cifs_del_lock_waiters(li); | |
434 | kfree(li); | |
435 | } | |
436 | list_del(&cifs_file->llist->llist); | |
437 | kfree(cifs_file->llist); | |
438 | up_write(&cifsi->lock_sem); | |
439 | ||
440 | cifs_put_tlink(cifs_file->tlink); | |
441 | dput(cifs_file->dentry); | |
442 | cifs_sb_deactive(sb); | |
443 | kfree(cifs_file); | |
444 | } | |
445 | ||
446 | static void cifsFileInfo_put_work(struct work_struct *work) | |
447 | { | |
448 | struct cifsFileInfo *cifs_file = container_of(work, | |
449 | struct cifsFileInfo, put); | |
450 | ||
451 | cifsFileInfo_put_final(cifs_file); | |
452 | } | |
453 | ||
b98749ca AA |
454 | /** |
455 | * cifsFileInfo_put - release a reference of file priv data | |
456 | * | |
457 | * Always potentially wait for oplock handler. See _cifsFileInfo_put(). | |
607dfc79 SF |
458 | * |
459 | * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file | |
cdff08e7 | 460 | */ |
b33879aa | 461 | void cifsFileInfo_put(struct cifsFileInfo *cifs_file) |
b98749ca | 462 | { |
32546a95 | 463 | _cifsFileInfo_put(cifs_file, true, true); |
b98749ca AA |
464 | } |
465 | ||
466 | /** | |
467 | * _cifsFileInfo_put - release a reference of file priv data | |
468 | * | |
469 | * This may involve closing the filehandle @cifs_file out on the | |
32546a95 RS |
470 | * server. Must be called without holding tcon->open_file_lock, |
471 | * cinode->open_file_lock and cifs_file->file_info_lock. | |
b98749ca AA |
472 | * |
473 | * If @wait_for_oplock_handler is true and we are releasing the last | |
474 | * reference, wait for any running oplock break handler of the file | |
607dfc79 SF |
475 | * and cancel any pending one. |
476 | * | |
477 | * @cifs_file: cifs/smb3 specific info (eg refcounts) for an open file | |
478 | * @wait_oplock_handler: must be false if called from oplock_break_handler | |
479 | * @offload: not offloaded on close and oplock breaks | |
b98749ca AA |
480 | * |
481 | */ | |
32546a95 RS |
482 | void _cifsFileInfo_put(struct cifsFileInfo *cifs_file, |
483 | bool wait_oplock_handler, bool offload) | |
b33879aa | 484 | { |
2b0143b5 | 485 | struct inode *inode = d_inode(cifs_file->dentry); |
96daf2b0 | 486 | struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink); |
233839b1 | 487 | struct TCP_Server_Info *server = tcon->ses->server; |
e66673e3 | 488 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
24261fc2 MG |
489 | struct super_block *sb = inode->i_sb; |
490 | struct cifs_sb_info *cifs_sb = CIFS_SB(sb); | |
233839b1 PS |
491 | struct cifs_fid fid; |
492 | struct cifs_pending_open open; | |
ca7df8e0 | 493 | bool oplock_break_cancelled; |
cdff08e7 | 494 | |
3afca265 | 495 | spin_lock(&tcon->open_file_lock); |
1a67c415 | 496 | spin_lock(&cifsi->open_file_lock); |
3afca265 | 497 | spin_lock(&cifs_file->file_info_lock); |
5f6dbc9e | 498 | if (--cifs_file->count > 0) { |
3afca265 | 499 | spin_unlock(&cifs_file->file_info_lock); |
1a67c415 | 500 | spin_unlock(&cifsi->open_file_lock); |
3afca265 | 501 | spin_unlock(&tcon->open_file_lock); |
cdff08e7 SF |
502 | return; |
503 | } | |
3afca265 | 504 | spin_unlock(&cifs_file->file_info_lock); |
cdff08e7 | 505 | |
233839b1 PS |
506 | if (server->ops->get_lease_key) |
507 | server->ops->get_lease_key(inode, &fid); | |
508 | ||
509 | /* store open in pending opens to make sure we don't miss lease break */ | |
510 | cifs_add_pending_open_locked(&fid, cifs_file->tlink, &open); | |
511 | ||
cdff08e7 SF |
512 | /* remove it from the lists */ |
513 | list_del(&cifs_file->flist); | |
514 | list_del(&cifs_file->tlist); | |
fae8044c | 515 | atomic_dec(&tcon->num_local_opens); |
cdff08e7 SF |
516 | |
517 | if (list_empty(&cifsi->openFileList)) { | |
f96637be | 518 | cifs_dbg(FYI, "closing last open instance for inode %p\n", |
2b0143b5 | 519 | d_inode(cifs_file->dentry)); |
25364138 PS |
520 | /* |
521 | * In strict cache mode we need invalidate mapping on the last | |
522 | * close because it may cause a error when we open this file | |
523 | * again and get at least level II oplock. | |
524 | */ | |
4f8ba8a0 | 525 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) |
aff8d5ca | 526 | set_bit(CIFS_INO_INVALID_MAPPING, &cifsi->flags); |
c6723628 | 527 | cifs_set_oplock_level(cifsi, 0); |
cdff08e7 | 528 | } |
3afca265 | 529 | |
1a67c415 | 530 | spin_unlock(&cifsi->open_file_lock); |
3afca265 | 531 | spin_unlock(&tcon->open_file_lock); |
cdff08e7 | 532 | |
b98749ca AA |
533 | oplock_break_cancelled = wait_oplock_handler ? |
534 | cancel_work_sync(&cifs_file->oplock_break) : false; | |
ad635942 | 535 | |
cdff08e7 | 536 | if (!tcon->need_reconnect && !cifs_file->invalidHandle) { |
0ff78a22 | 537 | struct TCP_Server_Info *server = tcon->ses->server; |
6d5786a3 | 538 | unsigned int xid; |
0ff78a22 | 539 | |
6d5786a3 | 540 | xid = get_xid(); |
43f8a6a7 SF |
541 | if (server->ops->close_getattr) |
542 | server->ops->close_getattr(xid, tcon, cifs_file); | |
543 | else if (server->ops->close) | |
760ad0ca PS |
544 | server->ops->close(xid, tcon, &cifs_file->fid); |
545 | _free_xid(xid); | |
cdff08e7 SF |
546 | } |
547 | ||
ca7df8e0 SP |
548 | if (oplock_break_cancelled) |
549 | cifs_done_oplock_break(cifsi); | |
550 | ||
233839b1 PS |
551 | cifs_del_pending_open(&open); |
552 | ||
32546a95 RS |
553 | if (offload) |
554 | queue_work(fileinfo_put_wq, &cifs_file->put); | |
555 | else | |
556 | cifsFileInfo_put_final(cifs_file); | |
b33879aa JL |
557 | } |
558 | ||
1da177e4 | 559 | int cifs_open(struct inode *inode, struct file *file) |
233839b1 | 560 | |
1da177e4 LT |
561 | { |
562 | int rc = -EACCES; | |
6d5786a3 | 563 | unsigned int xid; |
590a3fe0 | 564 | __u32 oplock; |
1da177e4 | 565 | struct cifs_sb_info *cifs_sb; |
b8c32dbb | 566 | struct TCP_Server_Info *server; |
96daf2b0 | 567 | struct cifs_tcon *tcon; |
7ffec372 | 568 | struct tcon_link *tlink; |
fb1214e4 | 569 | struct cifsFileInfo *cfile = NULL; |
f6a9bc33 AV |
570 | void *page; |
571 | const char *full_path; | |
7e12eddb | 572 | bool posix_open_ok = false; |
fb1214e4 | 573 | struct cifs_fid fid; |
233839b1 | 574 | struct cifs_pending_open open; |
1da177e4 | 575 | |
6d5786a3 | 576 | xid = get_xid(); |
1da177e4 LT |
577 | |
578 | cifs_sb = CIFS_SB(inode->i_sb); | |
087f757b SF |
579 | if (unlikely(cifs_forced_shutdown(cifs_sb))) { |
580 | free_xid(xid); | |
581 | return -EIO; | |
582 | } | |
583 | ||
7ffec372 JL |
584 | tlink = cifs_sb_tlink(cifs_sb); |
585 | if (IS_ERR(tlink)) { | |
6d5786a3 | 586 | free_xid(xid); |
7ffec372 JL |
587 | return PTR_ERR(tlink); |
588 | } | |
589 | tcon = tlink_tcon(tlink); | |
b8c32dbb | 590 | server = tcon->ses->server; |
1da177e4 | 591 | |
f6a9bc33 AV |
592 | page = alloc_dentry_path(); |
593 | full_path = build_path_from_dentry(file_dentry(file), page); | |
594 | if (IS_ERR(full_path)) { | |
595 | rc = PTR_ERR(full_path); | |
232341ba | 596 | goto out; |
1da177e4 LT |
597 | } |
598 | ||
f96637be | 599 | cifs_dbg(FYI, "inode = 0x%p file flags are 0x%x for %s\n", |
b6b38f70 | 600 | inode, file->f_flags, full_path); |
276a74a4 | 601 | |
787aded6 NJ |
602 | if (file->f_flags & O_DIRECT && |
603 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO) { | |
604 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_BRL) | |
605 | file->f_op = &cifs_file_direct_nobrl_ops; | |
606 | else | |
607 | file->f_op = &cifs_file_direct_ops; | |
608 | } | |
609 | ||
c3f207ab RS |
610 | /* Get the cached handle as SMB2 close is deferred */ |
611 | rc = cifs_get_readable_path(tcon, full_path, &cfile); | |
612 | if (rc == 0) { | |
613 | if (file->f_flags == cfile->f_flags) { | |
614 | file->private_data = cfile; | |
860b69a9 | 615 | spin_lock(&CIFS_I(inode)->deferred_lock); |
c3f207ab RS |
616 | cifs_del_deferred_close(cfile); |
617 | spin_unlock(&CIFS_I(inode)->deferred_lock); | |
70431bfd | 618 | goto use_cache; |
c3f207ab | 619 | } else { |
c3f207ab RS |
620 | _cifsFileInfo_put(cfile, true, false); |
621 | } | |
c3f207ab RS |
622 | } |
623 | ||
233839b1 | 624 | if (server->oplocks) |
276a74a4 SF |
625 | oplock = REQ_OPLOCK; |
626 | else | |
627 | oplock = 0; | |
628 | ||
fb157ed2 | 629 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
64cc2c63 | 630 | if (!tcon->broken_posix_open && tcon->unix_ext && |
29e20f9c PS |
631 | cap_unix(tcon->ses) && (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
632 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { | |
276a74a4 | 633 | /* can not refresh inode info since size could be stale */ |
2422f676 | 634 | rc = cifs_posix_open(full_path, &inode, inode->i_sb, |
8401e936 | 635 | cifs_sb->ctx->file_mode /* ignored */, |
fb1214e4 | 636 | file->f_flags, &oplock, &fid.netfid, xid); |
276a74a4 | 637 | if (rc == 0) { |
f96637be | 638 | cifs_dbg(FYI, "posix open succeeded\n"); |
7e12eddb | 639 | posix_open_ok = true; |
64cc2c63 SF |
640 | } else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) { |
641 | if (tcon->ses->serverNOS) | |
f96637be | 642 | cifs_dbg(VFS, "server %s of type %s returned unexpected error on SMB posix open, disabling posix open support. Check if server update available.\n", |
b438fcf1 | 643 | tcon->ses->ip_addr, |
f96637be | 644 | tcon->ses->serverNOS); |
64cc2c63 | 645 | tcon->broken_posix_open = true; |
276a74a4 SF |
646 | } else if ((rc != -EIO) && (rc != -EREMOTE) && |
647 | (rc != -EOPNOTSUPP)) /* path not found or net err */ | |
648 | goto out; | |
fb1214e4 PS |
649 | /* |
650 | * Else fallthrough to retry open the old way on network i/o | |
651 | * or DFS errors. | |
652 | */ | |
276a74a4 | 653 | } |
fb157ed2 | 654 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
276a74a4 | 655 | |
233839b1 PS |
656 | if (server->ops->get_lease_key) |
657 | server->ops->get_lease_key(inode, &fid); | |
658 | ||
659 | cifs_add_pending_open(&fid, tlink, &open); | |
660 | ||
7e12eddb | 661 | if (!posix_open_ok) { |
b8c32dbb PS |
662 | if (server->ops->get_lease_key) |
663 | server->ops->get_lease_key(inode, &fid); | |
664 | ||
7e12eddb | 665 | rc = cifs_nt_open(full_path, inode, cifs_sb, tcon, |
fb1214e4 | 666 | file->f_flags, &oplock, &fid, xid); |
233839b1 PS |
667 | if (rc) { |
668 | cifs_del_pending_open(&open); | |
7e12eddb | 669 | goto out; |
233839b1 | 670 | } |
7e12eddb | 671 | } |
47c78b7f | 672 | |
fb1214e4 PS |
673 | cfile = cifs_new_fileinfo(&fid, file, tlink, oplock); |
674 | if (cfile == NULL) { | |
b8c32dbb PS |
675 | if (server->ops->close) |
676 | server->ops->close(xid, tcon, &fid); | |
233839b1 | 677 | cifs_del_pending_open(&open); |
1da177e4 LT |
678 | rc = -ENOMEM; |
679 | goto out; | |
680 | } | |
1da177e4 | 681 | |
fb157ed2 | 682 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
7e12eddb | 683 | if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) { |
fb1214e4 PS |
684 | /* |
685 | * Time to set mode which we can not set earlier due to | |
686 | * problems creating new read-only files. | |
687 | */ | |
7e12eddb PS |
688 | struct cifs_unix_set_info_args args = { |
689 | .mode = inode->i_mode, | |
49418b2c EB |
690 | .uid = INVALID_UID, /* no change */ |
691 | .gid = INVALID_GID, /* no change */ | |
7e12eddb PS |
692 | .ctime = NO_CHANGE_64, |
693 | .atime = NO_CHANGE_64, | |
694 | .mtime = NO_CHANGE_64, | |
695 | .device = 0, | |
696 | }; | |
fb1214e4 PS |
697 | CIFSSMBUnixSetFileInfo(xid, tcon, &args, fid.netfid, |
698 | cfile->pid); | |
1da177e4 | 699 | } |
fb157ed2 | 700 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
1da177e4 | 701 | |
70431bfd DH |
702 | use_cache: |
703 | fscache_use_cookie(cifs_inode_cookie(file_inode(file)), | |
704 | file->f_mode & FMODE_WRITE); | |
705 | if (file->f_flags & O_DIRECT && | |
706 | (!((file->f_flags & O_ACCMODE) != O_RDONLY) || | |
707 | file->f_flags & O_APPEND)) | |
708 | cifs_invalidate_cache(file_inode(file), | |
709 | FSCACHE_INVAL_DIO_WRITE); | |
710 | ||
1da177e4 | 711 | out: |
f6a9bc33 | 712 | free_dentry_path(page); |
6d5786a3 | 713 | free_xid(xid); |
7ffec372 | 714 | cifs_put_tlink(tlink); |
1da177e4 LT |
715 | return rc; |
716 | } | |
717 | ||
fb157ed2 | 718 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
f152fd5f | 719 | static int cifs_push_posix_locks(struct cifsFileInfo *cfile); |
fb157ed2 | 720 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
f152fd5f | 721 | |
2ae78ba8 PS |
722 | /* |
723 | * Try to reacquire byte range locks that were released when session | |
f152fd5f | 724 | * to server was lost. |
2ae78ba8 | 725 | */ |
f152fd5f PS |
726 | static int |
727 | cifs_relock_file(struct cifsFileInfo *cfile) | |
1da177e4 | 728 | { |
2b0143b5 | 729 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
f152fd5f | 730 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
1da177e4 | 731 | int rc = 0; |
fb157ed2 SF |
732 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
733 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
734 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ | |
1da177e4 | 735 | |
560d3889 | 736 | down_read_nested(&cinode->lock_sem, SINGLE_DEPTH_NESTING); |
f152fd5f | 737 | if (cinode->can_cache_brlcks) { |
689c3db4 PS |
738 | /* can cache locks - no need to relock */ |
739 | up_read(&cinode->lock_sem); | |
f152fd5f PS |
740 | return rc; |
741 | } | |
742 | ||
fb157ed2 | 743 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
f152fd5f PS |
744 | if (cap_unix(tcon->ses) && |
745 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
746 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
747 | rc = cifs_push_posix_locks(cfile); | |
748 | else | |
fb157ed2 | 749 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
f152fd5f | 750 | rc = tcon->ses->server->ops->push_mand_locks(cfile); |
1da177e4 | 751 | |
689c3db4 | 752 | up_read(&cinode->lock_sem); |
1da177e4 LT |
753 | return rc; |
754 | } | |
755 | ||
2ae78ba8 PS |
756 | static int |
757 | cifs_reopen_file(struct cifsFileInfo *cfile, bool can_flush) | |
1da177e4 LT |
758 | { |
759 | int rc = -EACCES; | |
6d5786a3 | 760 | unsigned int xid; |
590a3fe0 | 761 | __u32 oplock; |
1da177e4 | 762 | struct cifs_sb_info *cifs_sb; |
96daf2b0 | 763 | struct cifs_tcon *tcon; |
2ae78ba8 PS |
764 | struct TCP_Server_Info *server; |
765 | struct cifsInodeInfo *cinode; | |
fb8c4b14 | 766 | struct inode *inode; |
f6a9bc33 AV |
767 | void *page; |
768 | const char *full_path; | |
2ae78ba8 | 769 | int desired_access; |
1da177e4 | 770 | int disposition = FILE_OPEN; |
3d3ea8e6 | 771 | int create_options = CREATE_NOT_DIR; |
226730b4 | 772 | struct cifs_open_parms oparms; |
1da177e4 | 773 | |
6d5786a3 | 774 | xid = get_xid(); |
2ae78ba8 PS |
775 | mutex_lock(&cfile->fh_mutex); |
776 | if (!cfile->invalidHandle) { | |
777 | mutex_unlock(&cfile->fh_mutex); | |
6d5786a3 | 778 | free_xid(xid); |
f6a9bc33 | 779 | return 0; |
1da177e4 LT |
780 | } |
781 | ||
2b0143b5 | 782 | inode = d_inode(cfile->dentry); |
1da177e4 | 783 | cifs_sb = CIFS_SB(inode->i_sb); |
2ae78ba8 PS |
784 | tcon = tlink_tcon(cfile->tlink); |
785 | server = tcon->ses->server; | |
786 | ||
787 | /* | |
788 | * Can not grab rename sem here because various ops, including those | |
789 | * that already have the rename sem can end up causing writepage to get | |
790 | * called and if the server was down that means we end up here, and we | |
791 | * can never tell if the caller already has the rename_sem. | |
792 | */ | |
f6a9bc33 AV |
793 | page = alloc_dentry_path(); |
794 | full_path = build_path_from_dentry(cfile->dentry, page); | |
795 | if (IS_ERR(full_path)) { | |
2ae78ba8 | 796 | mutex_unlock(&cfile->fh_mutex); |
f6a9bc33 | 797 | free_dentry_path(page); |
6d5786a3 | 798 | free_xid(xid); |
f6a9bc33 | 799 | return PTR_ERR(full_path); |
1da177e4 LT |
800 | } |
801 | ||
f96637be JP |
802 | cifs_dbg(FYI, "inode = 0x%p file flags 0x%x for %s\n", |
803 | inode, cfile->f_flags, full_path); | |
1da177e4 | 804 | |
10b9b98e | 805 | if (tcon->ses->server->oplocks) |
1da177e4 LT |
806 | oplock = REQ_OPLOCK; |
807 | else | |
4b18f2a9 | 808 | oplock = 0; |
1da177e4 | 809 | |
fb157ed2 | 810 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
29e20f9c | 811 | if (tcon->unix_ext && cap_unix(tcon->ses) && |
7fc8f4e9 | 812 | (CIFS_UNIX_POSIX_PATH_OPS_CAP & |
29e20f9c | 813 | le64_to_cpu(tcon->fsUnixInfo.Capability))) { |
608712fe JL |
814 | /* |
815 | * O_CREAT, O_EXCL and O_TRUNC already had their effect on the | |
816 | * original open. Must mask them off for a reopen. | |
817 | */ | |
2ae78ba8 | 818 | unsigned int oflags = cfile->f_flags & |
15886177 | 819 | ~(O_CREAT | O_EXCL | O_TRUNC); |
608712fe | 820 | |
2422f676 | 821 | rc = cifs_posix_open(full_path, NULL, inode->i_sb, |
8401e936 | 822 | cifs_sb->ctx->file_mode /* ignored */, |
9cbc0b73 | 823 | oflags, &oplock, &cfile->fid.netfid, xid); |
7fc8f4e9 | 824 | if (rc == 0) { |
f96637be | 825 | cifs_dbg(FYI, "posix reopen succeeded\n"); |
fe090e4e | 826 | oparms.reconnect = true; |
7fc8f4e9 SF |
827 | goto reopen_success; |
828 | } | |
2ae78ba8 PS |
829 | /* |
830 | * fallthrough to retry open the old way on errors, especially | |
831 | * in the reconnect path it is important to retry hard | |
832 | */ | |
7fc8f4e9 | 833 | } |
fb157ed2 | 834 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
7fc8f4e9 | 835 | |
2ae78ba8 | 836 | desired_access = cifs_convert_flags(cfile->f_flags); |
7fc8f4e9 | 837 | |
44805b0e PS |
838 | /* O_SYNC also has bit for O_DSYNC so following check picks up either */ |
839 | if (cfile->f_flags & O_SYNC) | |
840 | create_options |= CREATE_WRITE_THROUGH; | |
841 | ||
842 | if (cfile->f_flags & O_DIRECT) | |
843 | create_options |= CREATE_NO_BUFFER; | |
844 | ||
b8c32dbb | 845 | if (server->ops->get_lease_key) |
9cbc0b73 | 846 | server->ops->get_lease_key(inode, &cfile->fid); |
b8c32dbb | 847 | |
226730b4 PS |
848 | oparms.tcon = tcon; |
849 | oparms.cifs_sb = cifs_sb; | |
850 | oparms.desired_access = desired_access; | |
0f060936 | 851 | oparms.create_options = cifs_create_options(cifs_sb, create_options); |
226730b4 PS |
852 | oparms.disposition = disposition; |
853 | oparms.path = full_path; | |
9cbc0b73 PS |
854 | oparms.fid = &cfile->fid; |
855 | oparms.reconnect = true; | |
226730b4 | 856 | |
2ae78ba8 PS |
857 | /* |
858 | * Can not refresh inode by passing in file_info buf to be returned by | |
d81b8a40 | 859 | * ops->open and then calling get_inode_info with returned buf since |
2ae78ba8 PS |
860 | * file might have write behind data that needs to be flushed and server |
861 | * version of file size can be stale. If we knew for sure that inode was | |
862 | * not dirty locally we could do this. | |
863 | */ | |
226730b4 | 864 | rc = server->ops->open(xid, &oparms, &oplock, NULL); |
b33fcf1c PS |
865 | if (rc == -ENOENT && oparms.reconnect == false) { |
866 | /* durable handle timeout is expired - open the file again */ | |
867 | rc = server->ops->open(xid, &oparms, &oplock, NULL); | |
868 | /* indicate that we need to relock the file */ | |
869 | oparms.reconnect = true; | |
870 | } | |
871 | ||
1da177e4 | 872 | if (rc) { |
2ae78ba8 | 873 | mutex_unlock(&cfile->fh_mutex); |
f96637be JP |
874 | cifs_dbg(FYI, "cifs_reopen returned 0x%x\n", rc); |
875 | cifs_dbg(FYI, "oplock: %d\n", oplock); | |
15886177 JL |
876 | goto reopen_error_exit; |
877 | } | |
878 | ||
fb157ed2 | 879 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
7fc8f4e9 | 880 | reopen_success: |
fb157ed2 | 881 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
2ae78ba8 PS |
882 | cfile->invalidHandle = false; |
883 | mutex_unlock(&cfile->fh_mutex); | |
884 | cinode = CIFS_I(inode); | |
15886177 JL |
885 | |
886 | if (can_flush) { | |
887 | rc = filemap_write_and_wait(inode->i_mapping); | |
9a66396f PS |
888 | if (!is_interrupt_error(rc)) |
889 | mapping_set_error(inode->i_mapping, rc); | |
15886177 | 890 | |
d313852d SF |
891 | if (tcon->posix_extensions) |
892 | rc = smb311_posix_get_inode_info(&inode, full_path, inode->i_sb, xid); | |
893 | else if (tcon->unix_ext) | |
2ae78ba8 PS |
894 | rc = cifs_get_inode_info_unix(&inode, full_path, |
895 | inode->i_sb, xid); | |
15886177 | 896 | else |
2ae78ba8 PS |
897 | rc = cifs_get_inode_info(&inode, full_path, NULL, |
898 | inode->i_sb, xid, NULL); | |
899 | } | |
900 | /* | |
901 | * Else we are writing out data to server already and could deadlock if | |
902 | * we tried to flush data, and since we do not know if we have data that | |
903 | * would invalidate the current end of file on the server we can not go | |
904 | * to the server to get the new inode info. | |
905 | */ | |
906 | ||
de740250 PS |
907 | /* |
908 | * If the server returned a read oplock and we have mandatory brlocks, | |
909 | * set oplock level to None. | |
910 | */ | |
911 | if (server->ops->is_read_op(oplock) && cifs_has_mand_locks(cinode)) { | |
912 | cifs_dbg(FYI, "Reset oplock val from read to None due to mand locks\n"); | |
913 | oplock = 0; | |
914 | } | |
915 | ||
9cbc0b73 PS |
916 | server->ops->set_fid(cfile, &cfile->fid, oplock); |
917 | if (oparms.reconnect) | |
918 | cifs_relock_file(cfile); | |
15886177 JL |
919 | |
920 | reopen_error_exit: | |
f6a9bc33 | 921 | free_dentry_path(page); |
6d5786a3 | 922 | free_xid(xid); |
1da177e4 LT |
923 | return rc; |
924 | } | |
925 | ||
c3f207ab RS |
926 | void smb2_deferred_work_close(struct work_struct *work) |
927 | { | |
928 | struct cifsFileInfo *cfile = container_of(work, | |
929 | struct cifsFileInfo, deferred.work); | |
930 | ||
931 | spin_lock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); | |
932 | cifs_del_deferred_close(cfile); | |
860b69a9 | 933 | cfile->deferred_close_scheduled = false; |
c3f207ab RS |
934 | spin_unlock(&CIFS_I(d_inode(cfile->dentry))->deferred_lock); |
935 | _cifsFileInfo_put(cfile, true, false); | |
936 | } | |
937 | ||
1da177e4 LT |
938 | int cifs_close(struct inode *inode, struct file *file) |
939 | { | |
c3f207ab RS |
940 | struct cifsFileInfo *cfile; |
941 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
942 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
943 | struct cifs_deferred_close *dclose; | |
944 | ||
70431bfd DH |
945 | cifs_fscache_unuse_inode_cookie(inode, file->f_mode & FMODE_WRITE); |
946 | ||
77970693 | 947 | if (file->private_data != NULL) { |
c3f207ab | 948 | cfile = file->private_data; |
77970693 | 949 | file->private_data = NULL; |
c3f207ab RS |
950 | dclose = kmalloc(sizeof(struct cifs_deferred_close), GFP_KERNEL); |
951 | if ((cinode->oplock == CIFS_CACHE_RHW_FLG) && | |
0ab95c25 | 952 | cinode->lease_granted && |
35866f3f | 953 | !test_bit(CIFS_INO_CLOSE_ON_LOCK, &cinode->flags) && |
c3f207ab | 954 | dclose) { |
4f222622 | 955 | if (test_and_clear_bit(CIFS_INO_MODIFIED_ATTR, &cinode->flags)) { |
c3f207ab | 956 | inode->i_ctime = inode->i_mtime = current_time(inode); |
18d04062 | 957 | } |
c3f207ab RS |
958 | spin_lock(&cinode->deferred_lock); |
959 | cifs_add_deferred_close(cfile, dclose); | |
860b69a9 RS |
960 | if (cfile->deferred_close_scheduled && |
961 | delayed_work_pending(&cfile->deferred)) { | |
9687c85d RS |
962 | /* |
963 | * If there is no pending work, mod_delayed_work queues new work. | |
964 | * So, Increase the ref count to avoid use-after-free. | |
965 | */ | |
966 | if (!mod_delayed_work(deferredclose_wq, | |
5efdd912 | 967 | &cfile->deferred, cifs_sb->ctx->closetimeo)) |
9687c85d | 968 | cifsFileInfo_get(cfile); |
c3f207ab RS |
969 | } else { |
970 | /* Deferred close for files */ | |
971 | queue_delayed_work(deferredclose_wq, | |
5efdd912 | 972 | &cfile->deferred, cifs_sb->ctx->closetimeo); |
860b69a9 | 973 | cfile->deferred_close_scheduled = true; |
c3f207ab RS |
974 | spin_unlock(&cinode->deferred_lock); |
975 | return 0; | |
976 | } | |
977 | spin_unlock(&cinode->deferred_lock); | |
978 | _cifsFileInfo_put(cfile, true, false); | |
979 | } else { | |
980 | _cifsFileInfo_put(cfile, true, false); | |
981 | kfree(dclose); | |
982 | } | |
77970693 | 983 | } |
7ee1af76 | 984 | |
cdff08e7 SF |
985 | /* return code from the ->release op is always ignored */ |
986 | return 0; | |
1da177e4 LT |
987 | } |
988 | ||
52ace1ef SF |
989 | void |
990 | cifs_reopen_persistent_handles(struct cifs_tcon *tcon) | |
991 | { | |
9543c8ab | 992 | struct cifsFileInfo *open_file, *tmp; |
f2cca6a7 PS |
993 | struct list_head tmp_list; |
994 | ||
96a988ff PS |
995 | if (!tcon->use_persistent || !tcon->need_reopen_files) |
996 | return; | |
997 | ||
998 | tcon->need_reopen_files = false; | |
999 | ||
a0a3036b | 1000 | cifs_dbg(FYI, "Reopen persistent handles\n"); |
f2cca6a7 | 1001 | INIT_LIST_HEAD(&tmp_list); |
52ace1ef SF |
1002 | |
1003 | /* list all files open on tree connection, reopen resilient handles */ | |
1004 | spin_lock(&tcon->open_file_lock); | |
9543c8ab | 1005 | list_for_each_entry(open_file, &tcon->openFileList, tlist) { |
f2cca6a7 PS |
1006 | if (!open_file->invalidHandle) |
1007 | continue; | |
1008 | cifsFileInfo_get(open_file); | |
1009 | list_add_tail(&open_file->rlist, &tmp_list); | |
52ace1ef SF |
1010 | } |
1011 | spin_unlock(&tcon->open_file_lock); | |
f2cca6a7 | 1012 | |
9543c8ab | 1013 | list_for_each_entry_safe(open_file, tmp, &tmp_list, rlist) { |
96a988ff PS |
1014 | if (cifs_reopen_file(open_file, false /* do not flush */)) |
1015 | tcon->need_reopen_files = true; | |
f2cca6a7 PS |
1016 | list_del_init(&open_file->rlist); |
1017 | cifsFileInfo_put(open_file); | |
1018 | } | |
52ace1ef SF |
1019 | } |
1020 | ||
1da177e4 LT |
1021 | int cifs_closedir(struct inode *inode, struct file *file) |
1022 | { | |
1023 | int rc = 0; | |
6d5786a3 | 1024 | unsigned int xid; |
4b4de76e | 1025 | struct cifsFileInfo *cfile = file->private_data; |
92fc65a7 PS |
1026 | struct cifs_tcon *tcon; |
1027 | struct TCP_Server_Info *server; | |
1028 | char *buf; | |
1da177e4 | 1029 | |
f96637be | 1030 | cifs_dbg(FYI, "Closedir inode = 0x%p\n", inode); |
1da177e4 | 1031 | |
92fc65a7 PS |
1032 | if (cfile == NULL) |
1033 | return rc; | |
1034 | ||
6d5786a3 | 1035 | xid = get_xid(); |
92fc65a7 PS |
1036 | tcon = tlink_tcon(cfile->tlink); |
1037 | server = tcon->ses->server; | |
1da177e4 | 1038 | |
f96637be | 1039 | cifs_dbg(FYI, "Freeing private data in close dir\n"); |
3afca265 | 1040 | spin_lock(&cfile->file_info_lock); |
52755808 | 1041 | if (server->ops->dir_needs_close(cfile)) { |
92fc65a7 | 1042 | cfile->invalidHandle = true; |
3afca265 | 1043 | spin_unlock(&cfile->file_info_lock); |
92fc65a7 PS |
1044 | if (server->ops->close_dir) |
1045 | rc = server->ops->close_dir(xid, tcon, &cfile->fid); | |
1046 | else | |
1047 | rc = -ENOSYS; | |
f96637be | 1048 | cifs_dbg(FYI, "Closing uncompleted readdir with rc %d\n", rc); |
92fc65a7 PS |
1049 | /* not much we can do if it fails anyway, ignore rc */ |
1050 | rc = 0; | |
1051 | } else | |
3afca265 | 1052 | spin_unlock(&cfile->file_info_lock); |
92fc65a7 PS |
1053 | |
1054 | buf = cfile->srch_inf.ntwrk_buf_start; | |
1055 | if (buf) { | |
f96637be | 1056 | cifs_dbg(FYI, "closedir free smb buf in srch struct\n"); |
92fc65a7 PS |
1057 | cfile->srch_inf.ntwrk_buf_start = NULL; |
1058 | if (cfile->srch_inf.smallBuf) | |
1059 | cifs_small_buf_release(buf); | |
1060 | else | |
1061 | cifs_buf_release(buf); | |
1da177e4 | 1062 | } |
92fc65a7 PS |
1063 | |
1064 | cifs_put_tlink(cfile->tlink); | |
1065 | kfree(file->private_data); | |
1066 | file->private_data = NULL; | |
1da177e4 | 1067 | /* BB can we lock the filestruct while this is going on? */ |
6d5786a3 | 1068 | free_xid(xid); |
1da177e4 LT |
1069 | return rc; |
1070 | } | |
1071 | ||
85160e03 | 1072 | static struct cifsLockInfo * |
9645759c | 1073 | cifs_lock_init(__u64 offset, __u64 length, __u8 type, __u16 flags) |
7ee1af76 | 1074 | { |
a88b4707 | 1075 | struct cifsLockInfo *lock = |
fb8c4b14 | 1076 | kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL); |
a88b4707 PS |
1077 | if (!lock) |
1078 | return lock; | |
1079 | lock->offset = offset; | |
1080 | lock->length = length; | |
1081 | lock->type = type; | |
a88b4707 | 1082 | lock->pid = current->tgid; |
9645759c | 1083 | lock->flags = flags; |
a88b4707 PS |
1084 | INIT_LIST_HEAD(&lock->blist); |
1085 | init_waitqueue_head(&lock->block_q); | |
1086 | return lock; | |
85160e03 PS |
1087 | } |
1088 | ||
f7ba7fe6 | 1089 | void |
85160e03 PS |
1090 | cifs_del_lock_waiters(struct cifsLockInfo *lock) |
1091 | { | |
1092 | struct cifsLockInfo *li, *tmp; | |
1093 | list_for_each_entry_safe(li, tmp, &lock->blist, blist) { | |
1094 | list_del_init(&li->blist); | |
1095 | wake_up(&li->block_q); | |
1096 | } | |
1097 | } | |
1098 | ||
081c0414 PS |
1099 | #define CIFS_LOCK_OP 0 |
1100 | #define CIFS_READ_OP 1 | |
1101 | #define CIFS_WRITE_OP 2 | |
1102 | ||
1103 | /* @rw_check : 0 - no op, 1 - read, 2 - write */ | |
85160e03 | 1104 | static bool |
f45d3416 | 1105 | cifs_find_fid_lock_conflict(struct cifs_fid_locks *fdlocks, __u64 offset, |
9645759c RS |
1106 | __u64 length, __u8 type, __u16 flags, |
1107 | struct cifsFileInfo *cfile, | |
081c0414 | 1108 | struct cifsLockInfo **conf_lock, int rw_check) |
85160e03 | 1109 | { |
fbd35aca | 1110 | struct cifsLockInfo *li; |
f45d3416 | 1111 | struct cifsFileInfo *cur_cfile = fdlocks->cfile; |
106dc538 | 1112 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 | 1113 | |
f45d3416 | 1114 | list_for_each_entry(li, &fdlocks->locks, llist) { |
85160e03 PS |
1115 | if (offset + length <= li->offset || |
1116 | offset >= li->offset + li->length) | |
1117 | continue; | |
081c0414 PS |
1118 | if (rw_check != CIFS_LOCK_OP && current->tgid == li->pid && |
1119 | server->ops->compare_fids(cfile, cur_cfile)) { | |
1120 | /* shared lock prevents write op through the same fid */ | |
1121 | if (!(li->type & server->vals->shared_lock_type) || | |
1122 | rw_check != CIFS_WRITE_OP) | |
1123 | continue; | |
1124 | } | |
f45d3416 PS |
1125 | if ((type & server->vals->shared_lock_type) && |
1126 | ((server->ops->compare_fids(cfile, cur_cfile) && | |
1127 | current->tgid == li->pid) || type == li->type)) | |
85160e03 | 1128 | continue; |
9645759c RS |
1129 | if (rw_check == CIFS_LOCK_OP && |
1130 | (flags & FL_OFDLCK) && (li->flags & FL_OFDLCK) && | |
1131 | server->ops->compare_fids(cfile, cur_cfile)) | |
1132 | continue; | |
579f9053 PS |
1133 | if (conf_lock) |
1134 | *conf_lock = li; | |
f45d3416 | 1135 | return true; |
85160e03 PS |
1136 | } |
1137 | return false; | |
1138 | } | |
1139 | ||
579f9053 | 1140 | bool |
55157dfb | 1141 | cifs_find_lock_conflict(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
9645759c RS |
1142 | __u8 type, __u16 flags, |
1143 | struct cifsLockInfo **conf_lock, int rw_check) | |
161ebf9f | 1144 | { |
fbd35aca | 1145 | bool rc = false; |
f45d3416 | 1146 | struct cifs_fid_locks *cur; |
2b0143b5 | 1147 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
fbd35aca | 1148 | |
f45d3416 PS |
1149 | list_for_each_entry(cur, &cinode->llist, llist) { |
1150 | rc = cifs_find_fid_lock_conflict(cur, offset, length, type, | |
9645759c RS |
1151 | flags, cfile, conf_lock, |
1152 | rw_check); | |
fbd35aca PS |
1153 | if (rc) |
1154 | break; | |
1155 | } | |
fbd35aca PS |
1156 | |
1157 | return rc; | |
161ebf9f PS |
1158 | } |
1159 | ||
9a5101c8 PS |
1160 | /* |
1161 | * Check if there is another lock that prevents us to set the lock (mandatory | |
1162 | * style). If such a lock exists, update the flock structure with its | |
1163 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
1164 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
1165 | * the server or 1 otherwise. | |
1166 | */ | |
85160e03 | 1167 | static int |
fbd35aca PS |
1168 | cifs_lock_test(struct cifsFileInfo *cfile, __u64 offset, __u64 length, |
1169 | __u8 type, struct file_lock *flock) | |
85160e03 PS |
1170 | { |
1171 | int rc = 0; | |
1172 | struct cifsLockInfo *conf_lock; | |
2b0143b5 | 1173 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
106dc538 | 1174 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; |
85160e03 PS |
1175 | bool exist; |
1176 | ||
1b4b55a1 | 1177 | down_read(&cinode->lock_sem); |
85160e03 | 1178 | |
55157dfb | 1179 | exist = cifs_find_lock_conflict(cfile, offset, length, type, |
9645759c RS |
1180 | flock->fl_flags, &conf_lock, |
1181 | CIFS_LOCK_OP); | |
85160e03 PS |
1182 | if (exist) { |
1183 | flock->fl_start = conf_lock->offset; | |
1184 | flock->fl_end = conf_lock->offset + conf_lock->length - 1; | |
1185 | flock->fl_pid = conf_lock->pid; | |
106dc538 | 1186 | if (conf_lock->type & server->vals->shared_lock_type) |
85160e03 PS |
1187 | flock->fl_type = F_RDLCK; |
1188 | else | |
1189 | flock->fl_type = F_WRLCK; | |
1190 | } else if (!cinode->can_cache_brlcks) | |
1191 | rc = 1; | |
1192 | else | |
1193 | flock->fl_type = F_UNLCK; | |
1194 | ||
1b4b55a1 | 1195 | up_read(&cinode->lock_sem); |
85160e03 PS |
1196 | return rc; |
1197 | } | |
1198 | ||
161ebf9f | 1199 | static void |
fbd35aca | 1200 | cifs_lock_add(struct cifsFileInfo *cfile, struct cifsLockInfo *lock) |
85160e03 | 1201 | { |
2b0143b5 | 1202 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
d46b0da7 | 1203 | cifs_down_write(&cinode->lock_sem); |
f45d3416 | 1204 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 1205 | up_write(&cinode->lock_sem); |
7ee1af76 JA |
1206 | } |
1207 | ||
9a5101c8 PS |
1208 | /* |
1209 | * Set the byte-range lock (mandatory style). Returns: | |
1210 | * 1) 0, if we set the lock and don't need to request to the server; | |
1211 | * 2) 1, if no locks prevent us but we need to request to the server; | |
413d6100 | 1212 | * 3) -EACCES, if there is a lock that prevents us and wait is false. |
9a5101c8 | 1213 | */ |
85160e03 | 1214 | static int |
fbd35aca | 1215 | cifs_lock_add_if(struct cifsFileInfo *cfile, struct cifsLockInfo *lock, |
161ebf9f | 1216 | bool wait) |
85160e03 | 1217 | { |
161ebf9f | 1218 | struct cifsLockInfo *conf_lock; |
2b0143b5 | 1219 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
85160e03 PS |
1220 | bool exist; |
1221 | int rc = 0; | |
1222 | ||
85160e03 PS |
1223 | try_again: |
1224 | exist = false; | |
d46b0da7 | 1225 | cifs_down_write(&cinode->lock_sem); |
85160e03 | 1226 | |
55157dfb | 1227 | exist = cifs_find_lock_conflict(cfile, lock->offset, lock->length, |
9645759c RS |
1228 | lock->type, lock->flags, &conf_lock, |
1229 | CIFS_LOCK_OP); | |
85160e03 | 1230 | if (!exist && cinode->can_cache_brlcks) { |
f45d3416 | 1231 | list_add_tail(&lock->llist, &cfile->llist->locks); |
1b4b55a1 | 1232 | up_write(&cinode->lock_sem); |
85160e03 PS |
1233 | return rc; |
1234 | } | |
1235 | ||
1236 | if (!exist) | |
1237 | rc = 1; | |
1238 | else if (!wait) | |
1239 | rc = -EACCES; | |
1240 | else { | |
1241 | list_add_tail(&lock->blist, &conf_lock->blist); | |
1b4b55a1 | 1242 | up_write(&cinode->lock_sem); |
85160e03 PS |
1243 | rc = wait_event_interruptible(lock->block_q, |
1244 | (lock->blist.prev == &lock->blist) && | |
1245 | (lock->blist.next == &lock->blist)); | |
1246 | if (!rc) | |
1247 | goto try_again; | |
d46b0da7 | 1248 | cifs_down_write(&cinode->lock_sem); |
a88b4707 | 1249 | list_del_init(&lock->blist); |
85160e03 PS |
1250 | } |
1251 | ||
1b4b55a1 | 1252 | up_write(&cinode->lock_sem); |
85160e03 PS |
1253 | return rc; |
1254 | } | |
1255 | ||
fb157ed2 | 1256 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
9a5101c8 PS |
1257 | /* |
1258 | * Check if there is another lock that prevents us to set the lock (posix | |
1259 | * style). If such a lock exists, update the flock structure with its | |
1260 | * properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks | |
1261 | * or leave it the same if we can't. Returns 0 if we don't need to request to | |
1262 | * the server or 1 otherwise. | |
1263 | */ | |
85160e03 | 1264 | static int |
4f6bcec9 PS |
1265 | cifs_posix_lock_test(struct file *file, struct file_lock *flock) |
1266 | { | |
1267 | int rc = 0; | |
496ad9aa | 1268 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
4f6bcec9 PS |
1269 | unsigned char saved_type = flock->fl_type; |
1270 | ||
50792760 PS |
1271 | if ((flock->fl_flags & FL_POSIX) == 0) |
1272 | return 1; | |
1273 | ||
1b4b55a1 | 1274 | down_read(&cinode->lock_sem); |
4f6bcec9 PS |
1275 | posix_test_lock(file, flock); |
1276 | ||
1277 | if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) { | |
1278 | flock->fl_type = saved_type; | |
1279 | rc = 1; | |
1280 | } | |
1281 | ||
1b4b55a1 | 1282 | up_read(&cinode->lock_sem); |
4f6bcec9 PS |
1283 | return rc; |
1284 | } | |
1285 | ||
9a5101c8 PS |
1286 | /* |
1287 | * Set the byte-range lock (posix style). Returns: | |
2e98c018 | 1288 | * 1) <0, if the error occurs while setting the lock; |
1289 | * 2) 0, if we set the lock and don't need to request to the server; | |
1290 | * 3) FILE_LOCK_DEFERRED, if we will wait for some other file_lock; | |
1291 | * 4) FILE_LOCK_DEFERRED + 1, if we need to request to the server. | |
9a5101c8 | 1292 | */ |
4f6bcec9 PS |
1293 | static int |
1294 | cifs_posix_lock_set(struct file *file, struct file_lock *flock) | |
1295 | { | |
496ad9aa | 1296 | struct cifsInodeInfo *cinode = CIFS_I(file_inode(file)); |
2e98c018 | 1297 | int rc = FILE_LOCK_DEFERRED + 1; |
50792760 PS |
1298 | |
1299 | if ((flock->fl_flags & FL_POSIX) == 0) | |
1300 | return rc; | |
4f6bcec9 | 1301 | |
d46b0da7 | 1302 | cifs_down_write(&cinode->lock_sem); |
4f6bcec9 | 1303 | if (!cinode->can_cache_brlcks) { |
1b4b55a1 | 1304 | up_write(&cinode->lock_sem); |
50792760 | 1305 | return rc; |
4f6bcec9 | 1306 | } |
66189be7 PS |
1307 | |
1308 | rc = posix_lock_file(file, flock, NULL); | |
1b4b55a1 | 1309 | up_write(&cinode->lock_sem); |
9ebb389d | 1310 | return rc; |
4f6bcec9 PS |
1311 | } |
1312 | ||
d39a4f71 | 1313 | int |
4f6bcec9 | 1314 | cifs_push_mandatory_locks(struct cifsFileInfo *cfile) |
85160e03 | 1315 | { |
6d5786a3 PS |
1316 | unsigned int xid; |
1317 | int rc = 0, stored_rc; | |
85160e03 PS |
1318 | struct cifsLockInfo *li, *tmp; |
1319 | struct cifs_tcon *tcon; | |
0013fb4c | 1320 | unsigned int num, max_num, max_buf; |
32b9aaf1 | 1321 | LOCKING_ANDX_RANGE *buf, *cur; |
4d61eda8 CIK |
1322 | static const int types[] = { |
1323 | LOCKING_ANDX_LARGE_FILES, | |
1324 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES | |
1325 | }; | |
32b9aaf1 | 1326 | int i; |
85160e03 | 1327 | |
6d5786a3 | 1328 | xid = get_xid(); |
85160e03 PS |
1329 | tcon = tlink_tcon(cfile->tlink); |
1330 | ||
0013fb4c PS |
1331 | /* |
1332 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
b9a74cde | 1333 | * and check it before using. |
0013fb4c PS |
1334 | */ |
1335 | max_buf = tcon->ses->server->maxBuf; | |
b9a74cde | 1336 | if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) { |
6d5786a3 | 1337 | free_xid(xid); |
0013fb4c PS |
1338 | return -EINVAL; |
1339 | } | |
1340 | ||
92a8109e RL |
1341 | BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) > |
1342 | PAGE_SIZE); | |
1343 | max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr), | |
1344 | PAGE_SIZE); | |
0013fb4c PS |
1345 | max_num = (max_buf - sizeof(struct smb_hdr)) / |
1346 | sizeof(LOCKING_ANDX_RANGE); | |
4b99d39b | 1347 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
32b9aaf1 | 1348 | if (!buf) { |
6d5786a3 | 1349 | free_xid(xid); |
e2f2886a | 1350 | return -ENOMEM; |
32b9aaf1 PS |
1351 | } |
1352 | ||
1353 | for (i = 0; i < 2; i++) { | |
1354 | cur = buf; | |
1355 | num = 0; | |
f45d3416 | 1356 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
32b9aaf1 PS |
1357 | if (li->type != types[i]) |
1358 | continue; | |
1359 | cur->Pid = cpu_to_le16(li->pid); | |
1360 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1361 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1362 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1363 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1364 | if (++num == max_num) { | |
4b4de76e PS |
1365 | stored_rc = cifs_lockv(xid, tcon, |
1366 | cfile->fid.netfid, | |
04a6aa8a PS |
1367 | (__u8)li->type, 0, num, |
1368 | buf); | |
32b9aaf1 PS |
1369 | if (stored_rc) |
1370 | rc = stored_rc; | |
1371 | cur = buf; | |
1372 | num = 0; | |
1373 | } else | |
1374 | cur++; | |
1375 | } | |
1376 | ||
1377 | if (num) { | |
4b4de76e | 1378 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
04a6aa8a | 1379 | (__u8)types[i], 0, num, buf); |
32b9aaf1 PS |
1380 | if (stored_rc) |
1381 | rc = stored_rc; | |
1382 | } | |
85160e03 PS |
1383 | } |
1384 | ||
32b9aaf1 | 1385 | kfree(buf); |
6d5786a3 | 1386 | free_xid(xid); |
85160e03 PS |
1387 | return rc; |
1388 | } | |
1389 | ||
3d22462a JL |
1390 | static __u32 |
1391 | hash_lockowner(fl_owner_t owner) | |
1392 | { | |
1393 | return cifs_lock_secret ^ hash32_ptr((const void *)owner); | |
1394 | } | |
fb157ed2 | 1395 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
3d22462a | 1396 | |
d5751469 PS |
1397 | struct lock_to_push { |
1398 | struct list_head llist; | |
1399 | __u64 offset; | |
1400 | __u64 length; | |
1401 | __u32 pid; | |
1402 | __u16 netfid; | |
1403 | __u8 type; | |
1404 | }; | |
1405 | ||
fb157ed2 | 1406 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
4f6bcec9 | 1407 | static int |
b8db928b | 1408 | cifs_push_posix_locks(struct cifsFileInfo *cfile) |
4f6bcec9 | 1409 | { |
2b0143b5 | 1410 | struct inode *inode = d_inode(cfile->dentry); |
4f6bcec9 | 1411 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
bd61e0a9 JL |
1412 | struct file_lock *flock; |
1413 | struct file_lock_context *flctx = inode->i_flctx; | |
e084c1bd | 1414 | unsigned int count = 0, i; |
4f6bcec9 | 1415 | int rc = 0, xid, type; |
d5751469 PS |
1416 | struct list_head locks_to_send, *el; |
1417 | struct lock_to_push *lck, *tmp; | |
4f6bcec9 | 1418 | __u64 length; |
4f6bcec9 | 1419 | |
6d5786a3 | 1420 | xid = get_xid(); |
4f6bcec9 | 1421 | |
bd61e0a9 JL |
1422 | if (!flctx) |
1423 | goto out; | |
d5751469 | 1424 | |
e084c1bd JL |
1425 | spin_lock(&flctx->flc_lock); |
1426 | list_for_each(el, &flctx->flc_posix) { | |
1427 | count++; | |
1428 | } | |
1429 | spin_unlock(&flctx->flc_lock); | |
1430 | ||
4f6bcec9 PS |
1431 | INIT_LIST_HEAD(&locks_to_send); |
1432 | ||
d5751469 | 1433 | /* |
e084c1bd JL |
1434 | * Allocating count locks is enough because no FL_POSIX locks can be |
1435 | * added to the list while we are holding cinode->lock_sem that | |
ce85852b | 1436 | * protects locking operations of this inode. |
d5751469 | 1437 | */ |
e084c1bd | 1438 | for (i = 0; i < count; i++) { |
d5751469 PS |
1439 | lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL); |
1440 | if (!lck) { | |
1441 | rc = -ENOMEM; | |
1442 | goto err_out; | |
1443 | } | |
1444 | list_add_tail(&lck->llist, &locks_to_send); | |
1445 | } | |
1446 | ||
d5751469 | 1447 | el = locks_to_send.next; |
6109c850 | 1448 | spin_lock(&flctx->flc_lock); |
bd61e0a9 | 1449 | list_for_each_entry(flock, &flctx->flc_posix, fl_list) { |
d5751469 | 1450 | if (el == &locks_to_send) { |
ce85852b PS |
1451 | /* |
1452 | * The list ended. We don't have enough allocated | |
1453 | * structures - something is really wrong. | |
1454 | */ | |
f96637be | 1455 | cifs_dbg(VFS, "Can't push all brlocks!\n"); |
d5751469 PS |
1456 | break; |
1457 | } | |
d80c6984 | 1458 | length = cifs_flock_len(flock); |
4f6bcec9 PS |
1459 | if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK) |
1460 | type = CIFS_RDLCK; | |
1461 | else | |
1462 | type = CIFS_WRLCK; | |
d5751469 | 1463 | lck = list_entry(el, struct lock_to_push, llist); |
3d22462a | 1464 | lck->pid = hash_lockowner(flock->fl_owner); |
4b4de76e | 1465 | lck->netfid = cfile->fid.netfid; |
d5751469 PS |
1466 | lck->length = length; |
1467 | lck->type = type; | |
1468 | lck->offset = flock->fl_start; | |
4f6bcec9 | 1469 | } |
6109c850 | 1470 | spin_unlock(&flctx->flc_lock); |
4f6bcec9 PS |
1471 | |
1472 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
4f6bcec9 PS |
1473 | int stored_rc; |
1474 | ||
4f6bcec9 | 1475 | stored_rc = CIFSSMBPosixLock(xid, tcon, lck->netfid, lck->pid, |
c5fd363d | 1476 | lck->offset, lck->length, NULL, |
4f6bcec9 PS |
1477 | lck->type, 0); |
1478 | if (stored_rc) | |
1479 | rc = stored_rc; | |
1480 | list_del(&lck->llist); | |
1481 | kfree(lck); | |
1482 | } | |
1483 | ||
d5751469 | 1484 | out: |
6d5786a3 | 1485 | free_xid(xid); |
4f6bcec9 | 1486 | return rc; |
d5751469 PS |
1487 | err_out: |
1488 | list_for_each_entry_safe(lck, tmp, &locks_to_send, llist) { | |
1489 | list_del(&lck->llist); | |
1490 | kfree(lck); | |
1491 | } | |
1492 | goto out; | |
4f6bcec9 | 1493 | } |
fb157ed2 | 1494 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
4f6bcec9 | 1495 | |
9ec3c882 | 1496 | static int |
b8db928b | 1497 | cifs_push_locks(struct cifsFileInfo *cfile) |
9ec3c882 | 1498 | { |
2b0143b5 | 1499 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
b8db928b | 1500 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
9ec3c882 | 1501 | int rc = 0; |
fb157ed2 SF |
1502 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
1503 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
1504 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ | |
9ec3c882 PS |
1505 | |
1506 | /* we are going to update can_cache_brlcks here - need a write access */ | |
d46b0da7 | 1507 | cifs_down_write(&cinode->lock_sem); |
9ec3c882 PS |
1508 | if (!cinode->can_cache_brlcks) { |
1509 | up_write(&cinode->lock_sem); | |
1510 | return rc; | |
1511 | } | |
4f6bcec9 | 1512 | |
fb157ed2 | 1513 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
29e20f9c | 1514 | if (cap_unix(tcon->ses) && |
4f6bcec9 PS |
1515 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1516 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
b8db928b PS |
1517 | rc = cifs_push_posix_locks(cfile); |
1518 | else | |
fb157ed2 | 1519 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
b8db928b | 1520 | rc = tcon->ses->server->ops->push_mand_locks(cfile); |
4f6bcec9 | 1521 | |
b8db928b PS |
1522 | cinode->can_cache_brlcks = false; |
1523 | up_write(&cinode->lock_sem); | |
1524 | return rc; | |
4f6bcec9 PS |
1525 | } |
1526 | ||
03776f45 | 1527 | static void |
04a6aa8a | 1528 | cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock, |
106dc538 | 1529 | bool *wait_flag, struct TCP_Server_Info *server) |
1da177e4 | 1530 | { |
03776f45 | 1531 | if (flock->fl_flags & FL_POSIX) |
f96637be | 1532 | cifs_dbg(FYI, "Posix\n"); |
03776f45 | 1533 | if (flock->fl_flags & FL_FLOCK) |
f96637be | 1534 | cifs_dbg(FYI, "Flock\n"); |
03776f45 | 1535 | if (flock->fl_flags & FL_SLEEP) { |
f96637be | 1536 | cifs_dbg(FYI, "Blocking lock\n"); |
03776f45 | 1537 | *wait_flag = true; |
1da177e4 | 1538 | } |
03776f45 | 1539 | if (flock->fl_flags & FL_ACCESS) |
f96637be | 1540 | cifs_dbg(FYI, "Process suspended by mandatory locking - not implemented yet\n"); |
03776f45 | 1541 | if (flock->fl_flags & FL_LEASE) |
f96637be | 1542 | cifs_dbg(FYI, "Lease on file - not implemented yet\n"); |
03776f45 | 1543 | if (flock->fl_flags & |
3d6d854a | 1544 | (~(FL_POSIX | FL_FLOCK | FL_SLEEP | |
9645759c | 1545 | FL_ACCESS | FL_LEASE | FL_CLOSE | FL_OFDLCK))) |
f96637be | 1546 | cifs_dbg(FYI, "Unknown lock flags 0x%x\n", flock->fl_flags); |
1da177e4 | 1547 | |
106dc538 | 1548 | *type = server->vals->large_lock_type; |
03776f45 | 1549 | if (flock->fl_type == F_WRLCK) { |
f96637be | 1550 | cifs_dbg(FYI, "F_WRLCK\n"); |
106dc538 | 1551 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1552 | *lock = 1; |
1553 | } else if (flock->fl_type == F_UNLCK) { | |
f96637be | 1554 | cifs_dbg(FYI, "F_UNLCK\n"); |
106dc538 | 1555 | *type |= server->vals->unlock_lock_type; |
03776f45 PS |
1556 | *unlock = 1; |
1557 | /* Check if unlock includes more than one lock range */ | |
1558 | } else if (flock->fl_type == F_RDLCK) { | |
f96637be | 1559 | cifs_dbg(FYI, "F_RDLCK\n"); |
106dc538 | 1560 | *type |= server->vals->shared_lock_type; |
03776f45 PS |
1561 | *lock = 1; |
1562 | } else if (flock->fl_type == F_EXLCK) { | |
f96637be | 1563 | cifs_dbg(FYI, "F_EXLCK\n"); |
106dc538 | 1564 | *type |= server->vals->exclusive_lock_type; |
03776f45 PS |
1565 | *lock = 1; |
1566 | } else if (flock->fl_type == F_SHLCK) { | |
f96637be | 1567 | cifs_dbg(FYI, "F_SHLCK\n"); |
106dc538 | 1568 | *type |= server->vals->shared_lock_type; |
03776f45 | 1569 | *lock = 1; |
1da177e4 | 1570 | } else |
f96637be | 1571 | cifs_dbg(FYI, "Unknown type of lock\n"); |
03776f45 | 1572 | } |
1da177e4 | 1573 | |
03776f45 | 1574 | static int |
04a6aa8a | 1575 | cifs_getlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 | 1576 | bool wait_flag, bool posix_lck, unsigned int xid) |
03776f45 PS |
1577 | { |
1578 | int rc = 0; | |
d80c6984 | 1579 | __u64 length = cifs_flock_len(flock); |
4f6bcec9 PS |
1580 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1581 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1582 | struct TCP_Server_Info *server = tcon->ses->server; |
fb157ed2 | 1583 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
4b4de76e | 1584 | __u16 netfid = cfile->fid.netfid; |
f05337c6 | 1585 | |
03776f45 PS |
1586 | if (posix_lck) { |
1587 | int posix_lock_type; | |
4f6bcec9 PS |
1588 | |
1589 | rc = cifs_posix_lock_test(file, flock); | |
1590 | if (!rc) | |
1591 | return rc; | |
1592 | ||
106dc538 | 1593 | if (type & server->vals->shared_lock_type) |
03776f45 PS |
1594 | posix_lock_type = CIFS_RDLCK; |
1595 | else | |
1596 | posix_lock_type = CIFS_WRLCK; | |
3d22462a JL |
1597 | rc = CIFSSMBPosixLock(xid, tcon, netfid, |
1598 | hash_lockowner(flock->fl_owner), | |
c5fd363d | 1599 | flock->fl_start, length, flock, |
4f6bcec9 | 1600 | posix_lock_type, wait_flag); |
03776f45 PS |
1601 | return rc; |
1602 | } | |
fb157ed2 | 1603 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
1da177e4 | 1604 | |
fbd35aca | 1605 | rc = cifs_lock_test(cfile, flock->fl_start, length, type, flock); |
85160e03 PS |
1606 | if (!rc) |
1607 | return rc; | |
1608 | ||
03776f45 | 1609 | /* BB we could chain these into one lock request BB */ |
d39a4f71 PS |
1610 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, type, |
1611 | 1, 0, false); | |
03776f45 | 1612 | if (rc == 0) { |
d39a4f71 PS |
1613 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1614 | type, 0, 1, false); | |
03776f45 PS |
1615 | flock->fl_type = F_UNLCK; |
1616 | if (rc != 0) | |
f96637be JP |
1617 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1618 | rc); | |
a88b4707 | 1619 | return 0; |
1da177e4 | 1620 | } |
7ee1af76 | 1621 | |
106dc538 | 1622 | if (type & server->vals->shared_lock_type) { |
03776f45 | 1623 | flock->fl_type = F_WRLCK; |
a88b4707 | 1624 | return 0; |
7ee1af76 JA |
1625 | } |
1626 | ||
d39a4f71 PS |
1627 | type &= ~server->vals->exclusive_lock_type; |
1628 | ||
1629 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, | |
1630 | type | server->vals->shared_lock_type, | |
1631 | 1, 0, false); | |
03776f45 | 1632 | if (rc == 0) { |
d39a4f71 PS |
1633 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1634 | type | server->vals->shared_lock_type, 0, 1, false); | |
03776f45 PS |
1635 | flock->fl_type = F_RDLCK; |
1636 | if (rc != 0) | |
f96637be JP |
1637 | cifs_dbg(VFS, "Error unlocking previously locked range %d during test of lock\n", |
1638 | rc); | |
03776f45 PS |
1639 | } else |
1640 | flock->fl_type = F_WRLCK; | |
1641 | ||
a88b4707 | 1642 | return 0; |
03776f45 PS |
1643 | } |
1644 | ||
f7ba7fe6 | 1645 | void |
9ee305b7 PS |
1646 | cifs_move_llist(struct list_head *source, struct list_head *dest) |
1647 | { | |
1648 | struct list_head *li, *tmp; | |
1649 | list_for_each_safe(li, tmp, source) | |
1650 | list_move(li, dest); | |
1651 | } | |
1652 | ||
f7ba7fe6 | 1653 | void |
9ee305b7 PS |
1654 | cifs_free_llist(struct list_head *llist) |
1655 | { | |
1656 | struct cifsLockInfo *li, *tmp; | |
1657 | list_for_each_entry_safe(li, tmp, llist, llist) { | |
1658 | cifs_del_lock_waiters(li); | |
1659 | list_del(&li->llist); | |
1660 | kfree(li); | |
1661 | } | |
1662 | } | |
1663 | ||
fb157ed2 | 1664 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
d39a4f71 | 1665 | int |
6d5786a3 PS |
1666 | cifs_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, |
1667 | unsigned int xid) | |
9ee305b7 PS |
1668 | { |
1669 | int rc = 0, stored_rc; | |
4d61eda8 CIK |
1670 | static const int types[] = { |
1671 | LOCKING_ANDX_LARGE_FILES, | |
1672 | LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES | |
1673 | }; | |
9ee305b7 | 1674 | unsigned int i; |
0013fb4c | 1675 | unsigned int max_num, num, max_buf; |
9ee305b7 PS |
1676 | LOCKING_ANDX_RANGE *buf, *cur; |
1677 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
2b0143b5 | 1678 | struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); |
9ee305b7 | 1679 | struct cifsLockInfo *li, *tmp; |
d80c6984 | 1680 | __u64 length = cifs_flock_len(flock); |
9ee305b7 PS |
1681 | struct list_head tmp_llist; |
1682 | ||
1683 | INIT_LIST_HEAD(&tmp_llist); | |
1684 | ||
0013fb4c PS |
1685 | /* |
1686 | * Accessing maxBuf is racy with cifs_reconnect - need to store value | |
b9a74cde | 1687 | * and check it before using. |
0013fb4c PS |
1688 | */ |
1689 | max_buf = tcon->ses->server->maxBuf; | |
b9a74cde | 1690 | if (max_buf < (sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE))) |
0013fb4c PS |
1691 | return -EINVAL; |
1692 | ||
92a8109e RL |
1693 | BUILD_BUG_ON(sizeof(struct smb_hdr) + sizeof(LOCKING_ANDX_RANGE) > |
1694 | PAGE_SIZE); | |
1695 | max_buf = min_t(unsigned int, max_buf - sizeof(struct smb_hdr), | |
1696 | PAGE_SIZE); | |
0013fb4c PS |
1697 | max_num = (max_buf - sizeof(struct smb_hdr)) / |
1698 | sizeof(LOCKING_ANDX_RANGE); | |
4b99d39b | 1699 | buf = kcalloc(max_num, sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL); |
9ee305b7 PS |
1700 | if (!buf) |
1701 | return -ENOMEM; | |
1702 | ||
d46b0da7 | 1703 | cifs_down_write(&cinode->lock_sem); |
9ee305b7 PS |
1704 | for (i = 0; i < 2; i++) { |
1705 | cur = buf; | |
1706 | num = 0; | |
f45d3416 | 1707 | list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { |
9ee305b7 PS |
1708 | if (flock->fl_start > li->offset || |
1709 | (flock->fl_start + length) < | |
1710 | (li->offset + li->length)) | |
1711 | continue; | |
1712 | if (current->tgid != li->pid) | |
1713 | continue; | |
9ee305b7 PS |
1714 | if (types[i] != li->type) |
1715 | continue; | |
ea319d57 | 1716 | if (cinode->can_cache_brlcks) { |
9ee305b7 PS |
1717 | /* |
1718 | * We can cache brlock requests - simply remove | |
fbd35aca | 1719 | * a lock from the file's list. |
9ee305b7 PS |
1720 | */ |
1721 | list_del(&li->llist); | |
1722 | cifs_del_lock_waiters(li); | |
1723 | kfree(li); | |
ea319d57 | 1724 | continue; |
9ee305b7 | 1725 | } |
ea319d57 PS |
1726 | cur->Pid = cpu_to_le16(li->pid); |
1727 | cur->LengthLow = cpu_to_le32((u32)li->length); | |
1728 | cur->LengthHigh = cpu_to_le32((u32)(li->length>>32)); | |
1729 | cur->OffsetLow = cpu_to_le32((u32)li->offset); | |
1730 | cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32)); | |
1731 | /* | |
1732 | * We need to save a lock here to let us add it again to | |
1733 | * the file's list if the unlock range request fails on | |
1734 | * the server. | |
1735 | */ | |
1736 | list_move(&li->llist, &tmp_llist); | |
1737 | if (++num == max_num) { | |
4b4de76e PS |
1738 | stored_rc = cifs_lockv(xid, tcon, |
1739 | cfile->fid.netfid, | |
ea319d57 PS |
1740 | li->type, num, 0, buf); |
1741 | if (stored_rc) { | |
1742 | /* | |
1743 | * We failed on the unlock range | |
1744 | * request - add all locks from the tmp | |
1745 | * list to the head of the file's list. | |
1746 | */ | |
1747 | cifs_move_llist(&tmp_llist, | |
f45d3416 | 1748 | &cfile->llist->locks); |
ea319d57 PS |
1749 | rc = stored_rc; |
1750 | } else | |
1751 | /* | |
1752 | * The unlock range request succeed - | |
1753 | * free the tmp list. | |
1754 | */ | |
1755 | cifs_free_llist(&tmp_llist); | |
1756 | cur = buf; | |
1757 | num = 0; | |
1758 | } else | |
1759 | cur++; | |
9ee305b7 PS |
1760 | } |
1761 | if (num) { | |
4b4de76e | 1762 | stored_rc = cifs_lockv(xid, tcon, cfile->fid.netfid, |
9ee305b7 PS |
1763 | types[i], num, 0, buf); |
1764 | if (stored_rc) { | |
f45d3416 PS |
1765 | cifs_move_llist(&tmp_llist, |
1766 | &cfile->llist->locks); | |
9ee305b7 PS |
1767 | rc = stored_rc; |
1768 | } else | |
1769 | cifs_free_llist(&tmp_llist); | |
1770 | } | |
1771 | } | |
1772 | ||
1b4b55a1 | 1773 | up_write(&cinode->lock_sem); |
9ee305b7 PS |
1774 | kfree(buf); |
1775 | return rc; | |
1776 | } | |
fb157ed2 | 1777 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
9ee305b7 | 1778 | |
03776f45 | 1779 | static int |
f45d3416 | 1780 | cifs_setlk(struct file *file, struct file_lock *flock, __u32 type, |
6d5786a3 PS |
1781 | bool wait_flag, bool posix_lck, int lock, int unlock, |
1782 | unsigned int xid) | |
03776f45 PS |
1783 | { |
1784 | int rc = 0; | |
d80c6984 | 1785 | __u64 length = cifs_flock_len(flock); |
03776f45 PS |
1786 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; |
1787 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
106dc538 | 1788 | struct TCP_Server_Info *server = tcon->ses->server; |
2b0143b5 | 1789 | struct inode *inode = d_inode(cfile->dentry); |
03776f45 | 1790 | |
fb157ed2 | 1791 | #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY |
03776f45 | 1792 | if (posix_lck) { |
08547b03 | 1793 | int posix_lock_type; |
4f6bcec9 PS |
1794 | |
1795 | rc = cifs_posix_lock_set(file, flock); | |
2e98c018 | 1796 | if (rc <= FILE_LOCK_DEFERRED) |
4f6bcec9 PS |
1797 | return rc; |
1798 | ||
106dc538 | 1799 | if (type & server->vals->shared_lock_type) |
08547b03 SF |
1800 | posix_lock_type = CIFS_RDLCK; |
1801 | else | |
1802 | posix_lock_type = CIFS_WRLCK; | |
50c2f753 | 1803 | |
03776f45 | 1804 | if (unlock == 1) |
beb84dc8 | 1805 | posix_lock_type = CIFS_UNLCK; |
7ee1af76 | 1806 | |
f45d3416 | 1807 | rc = CIFSSMBPosixLock(xid, tcon, cfile->fid.netfid, |
3d22462a JL |
1808 | hash_lockowner(flock->fl_owner), |
1809 | flock->fl_start, length, | |
f45d3416 | 1810 | NULL, posix_lock_type, wait_flag); |
03776f45 PS |
1811 | goto out; |
1812 | } | |
fb157ed2 | 1813 | #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |
03776f45 | 1814 | if (lock) { |
161ebf9f PS |
1815 | struct cifsLockInfo *lock; |
1816 | ||
9645759c RS |
1817 | lock = cifs_lock_init(flock->fl_start, length, type, |
1818 | flock->fl_flags); | |
161ebf9f PS |
1819 | if (!lock) |
1820 | return -ENOMEM; | |
1821 | ||
fbd35aca | 1822 | rc = cifs_lock_add_if(cfile, lock, wait_flag); |
21cb2d90 | 1823 | if (rc < 0) { |
161ebf9f | 1824 | kfree(lock); |
21cb2d90 PS |
1825 | return rc; |
1826 | } | |
1827 | if (!rc) | |
85160e03 PS |
1828 | goto out; |
1829 | ||
63b7d3a4 PS |
1830 | /* |
1831 | * Windows 7 server can delay breaking lease from read to None | |
1832 | * if we set a byte-range lock on a file - break it explicitly | |
1833 | * before sending the lock to the server to be sure the next | |
1834 | * read won't conflict with non-overlapted locks due to | |
1835 | * pagereading. | |
1836 | */ | |
18cceb6a PS |
1837 | if (!CIFS_CACHE_WRITE(CIFS_I(inode)) && |
1838 | CIFS_CACHE_READ(CIFS_I(inode))) { | |
4f73c7d3 | 1839 | cifs_zap_mapping(inode); |
f96637be JP |
1840 | cifs_dbg(FYI, "Set no oplock for inode=%p due to mand locks\n", |
1841 | inode); | |
18cceb6a | 1842 | CIFS_I(inode)->oplock = 0; |
63b7d3a4 PS |
1843 | } |
1844 | ||
d39a4f71 PS |
1845 | rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length, |
1846 | type, 1, 0, wait_flag); | |
161ebf9f PS |
1847 | if (rc) { |
1848 | kfree(lock); | |
21cb2d90 | 1849 | return rc; |
03776f45 | 1850 | } |
161ebf9f | 1851 | |
fbd35aca | 1852 | cifs_lock_add(cfile, lock); |
9ee305b7 | 1853 | } else if (unlock) |
d39a4f71 | 1854 | rc = server->ops->mand_unlock_range(cfile, flock, xid); |
03776f45 | 1855 | |
03776f45 | 1856 | out: |
d0677992 | 1857 | if ((flock->fl_flags & FL_POSIX) || (flock->fl_flags & FL_FLOCK)) { |
bc31d0cd AA |
1858 | /* |
1859 | * If this is a request to remove all locks because we | |
1860 | * are closing the file, it doesn't matter if the | |
1861 | * unlocking failed as both cifs.ko and the SMB server | |
1862 | * remove the lock on file close | |
1863 | */ | |
1864 | if (rc) { | |
1865 | cifs_dbg(VFS, "%s failed rc=%d\n", __func__, rc); | |
1866 | if (!(flock->fl_flags & FL_CLOSE)) | |
1867 | return rc; | |
1868 | } | |
4f656367 | 1869 | rc = locks_lock_file_wait(file, flock); |
bc31d0cd | 1870 | } |
03776f45 PS |
1871 | return rc; |
1872 | } | |
1873 | ||
d0677992 SF |
1874 | int cifs_flock(struct file *file, int cmd, struct file_lock *fl) |
1875 | { | |
1876 | int rc, xid; | |
1877 | int lock = 0, unlock = 0; | |
1878 | bool wait_flag = false; | |
1879 | bool posix_lck = false; | |
1880 | struct cifs_sb_info *cifs_sb; | |
1881 | struct cifs_tcon *tcon; | |
d0677992 | 1882 | struct cifsFileInfo *cfile; |
d0677992 SF |
1883 | __u32 type; |
1884 | ||
1885 | rc = -EACCES; | |
1886 | xid = get_xid(); | |
1887 | ||
1888 | if (!(fl->fl_flags & FL_FLOCK)) | |
1889 | return -ENOLCK; | |
1890 | ||
1891 | cfile = (struct cifsFileInfo *)file->private_data; | |
1892 | tcon = tlink_tcon(cfile->tlink); | |
1893 | ||
1894 | cifs_read_flock(fl, &type, &lock, &unlock, &wait_flag, | |
1895 | tcon->ses->server); | |
1896 | cifs_sb = CIFS_FILE_SB(file); | |
d0677992 SF |
1897 | |
1898 | if (cap_unix(tcon->ses) && | |
1899 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
1900 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1901 | posix_lck = true; | |
1902 | ||
1903 | if (!lock && !unlock) { | |
1904 | /* | |
1905 | * if no lock or unlock then nothing to do since we do not | |
1906 | * know what it is | |
1907 | */ | |
1908 | free_xid(xid); | |
1909 | return -EOPNOTSUPP; | |
1910 | } | |
1911 | ||
1912 | rc = cifs_setlk(file, fl, type, wait_flag, posix_lck, lock, unlock, | |
1913 | xid); | |
1914 | free_xid(xid); | |
1915 | return rc; | |
1916 | ||
1917 | ||
1918 | } | |
1919 | ||
03776f45 PS |
1920 | int cifs_lock(struct file *file, int cmd, struct file_lock *flock) |
1921 | { | |
1922 | int rc, xid; | |
1923 | int lock = 0, unlock = 0; | |
1924 | bool wait_flag = false; | |
1925 | bool posix_lck = false; | |
1926 | struct cifs_sb_info *cifs_sb; | |
1927 | struct cifs_tcon *tcon; | |
03776f45 | 1928 | struct cifsFileInfo *cfile; |
04a6aa8a | 1929 | __u32 type; |
03776f45 PS |
1930 | |
1931 | rc = -EACCES; | |
6d5786a3 | 1932 | xid = get_xid(); |
03776f45 | 1933 | |
773891ff PA |
1934 | cifs_dbg(FYI, "%s: %pD2 cmd=0x%x type=0x%x flags=0x%x r=%lld:%lld\n", __func__, file, cmd, |
1935 | flock->fl_flags, flock->fl_type, (long long)flock->fl_start, | |
1936 | (long long)flock->fl_end); | |
03776f45 | 1937 | |
03776f45 PS |
1938 | cfile = (struct cifsFileInfo *)file->private_data; |
1939 | tcon = tlink_tcon(cfile->tlink); | |
106dc538 PS |
1940 | |
1941 | cifs_read_flock(flock, &type, &lock, &unlock, &wait_flag, | |
1942 | tcon->ses->server); | |
7119e220 | 1943 | cifs_sb = CIFS_FILE_SB(file); |
35866f3f | 1944 | set_bit(CIFS_INO_CLOSE_ON_LOCK, &CIFS_I(d_inode(cfile->dentry))->flags); |
03776f45 | 1945 | |
29e20f9c | 1946 | if (cap_unix(tcon->ses) && |
03776f45 PS |
1947 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && |
1948 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
1949 | posix_lck = true; | |
1950 | /* | |
1951 | * BB add code here to normalize offset and length to account for | |
1952 | * negative length which we can not accept over the wire. | |
1953 | */ | |
1954 | if (IS_GETLK(cmd)) { | |
4f6bcec9 | 1955 | rc = cifs_getlk(file, flock, type, wait_flag, posix_lck, xid); |
6d5786a3 | 1956 | free_xid(xid); |
03776f45 PS |
1957 | return rc; |
1958 | } | |
1959 | ||
1960 | if (!lock && !unlock) { | |
1961 | /* | |
1962 | * if no lock or unlock then nothing to do since we do not | |
1963 | * know what it is | |
1964 | */ | |
6d5786a3 | 1965 | free_xid(xid); |
03776f45 | 1966 | return -EOPNOTSUPP; |
7ee1af76 JA |
1967 | } |
1968 | ||
03776f45 PS |
1969 | rc = cifs_setlk(file, flock, type, wait_flag, posix_lck, lock, unlock, |
1970 | xid); | |
6d5786a3 | 1971 | free_xid(xid); |
1da177e4 LT |
1972 | return rc; |
1973 | } | |
1974 | ||
597b027f JL |
1975 | /* |
1976 | * update the file size (if needed) after a write. Should be called with | |
1977 | * the inode->i_lock held | |
1978 | */ | |
72432ffc | 1979 | void |
fbec9ab9 JL |
1980 | cifs_update_eof(struct cifsInodeInfo *cifsi, loff_t offset, |
1981 | unsigned int bytes_written) | |
1982 | { | |
1983 | loff_t end_of_write = offset + bytes_written; | |
1984 | ||
1985 | if (end_of_write > cifsi->server_eof) | |
1986 | cifsi->server_eof = end_of_write; | |
1987 | } | |
1988 | ||
ba9ad725 PS |
1989 | static ssize_t |
1990 | cifs_write(struct cifsFileInfo *open_file, __u32 pid, const char *write_data, | |
1991 | size_t write_size, loff_t *offset) | |
1da177e4 LT |
1992 | { |
1993 | int rc = 0; | |
1994 | unsigned int bytes_written = 0; | |
1995 | unsigned int total_written; | |
ba9ad725 PS |
1996 | struct cifs_tcon *tcon; |
1997 | struct TCP_Server_Info *server; | |
6d5786a3 | 1998 | unsigned int xid; |
7da4b49a | 1999 | struct dentry *dentry = open_file->dentry; |
2b0143b5 | 2000 | struct cifsInodeInfo *cifsi = CIFS_I(d_inode(dentry)); |
7c06514a | 2001 | struct cifs_io_parms io_parms = {0}; |
1da177e4 | 2002 | |
35c265e0 AV |
2003 | cifs_dbg(FYI, "write %zd bytes to offset %lld of %pd\n", |
2004 | write_size, *offset, dentry); | |
1da177e4 | 2005 | |
ba9ad725 PS |
2006 | tcon = tlink_tcon(open_file->tlink); |
2007 | server = tcon->ses->server; | |
2008 | ||
2009 | if (!server->ops->sync_write) | |
2010 | return -ENOSYS; | |
50c2f753 | 2011 | |
6d5786a3 | 2012 | xid = get_xid(); |
1da177e4 | 2013 | |
1da177e4 LT |
2014 | for (total_written = 0; write_size > total_written; |
2015 | total_written += bytes_written) { | |
2016 | rc = -EAGAIN; | |
2017 | while (rc == -EAGAIN) { | |
ca83ce3d JL |
2018 | struct kvec iov[2]; |
2019 | unsigned int len; | |
2020 | ||
1da177e4 | 2021 | if (open_file->invalidHandle) { |
1da177e4 LT |
2022 | /* we could deadlock if we called |
2023 | filemap_fdatawait from here so tell | |
fb8c4b14 | 2024 | reopen_file not to flush data to |
1da177e4 | 2025 | server now */ |
15886177 | 2026 | rc = cifs_reopen_file(open_file, false); |
1da177e4 LT |
2027 | if (rc != 0) |
2028 | break; | |
2029 | } | |
ca83ce3d | 2030 | |
2b0143b5 | 2031 | len = min(server->ops->wp_retry_size(d_inode(dentry)), |
cb7e9eab | 2032 | (unsigned int)write_size - total_written); |
ca83ce3d JL |
2033 | /* iov[0] is reserved for smb header */ |
2034 | iov[1].iov_base = (char *)write_data + total_written; | |
2035 | iov[1].iov_len = len; | |
fa2989f4 | 2036 | io_parms.pid = pid; |
ba9ad725 PS |
2037 | io_parms.tcon = tcon; |
2038 | io_parms.offset = *offset; | |
fa2989f4 | 2039 | io_parms.length = len; |
db8b631d SF |
2040 | rc = server->ops->sync_write(xid, &open_file->fid, |
2041 | &io_parms, &bytes_written, iov, 1); | |
1da177e4 LT |
2042 | } |
2043 | if (rc || (bytes_written == 0)) { | |
2044 | if (total_written) | |
2045 | break; | |
2046 | else { | |
6d5786a3 | 2047 | free_xid(xid); |
1da177e4 LT |
2048 | return rc; |
2049 | } | |
fbec9ab9 | 2050 | } else { |
2b0143b5 | 2051 | spin_lock(&d_inode(dentry)->i_lock); |
ba9ad725 | 2052 | cifs_update_eof(cifsi, *offset, bytes_written); |
2b0143b5 | 2053 | spin_unlock(&d_inode(dentry)->i_lock); |
ba9ad725 | 2054 | *offset += bytes_written; |
fbec9ab9 | 2055 | } |
1da177e4 LT |
2056 | } |
2057 | ||
ba9ad725 | 2058 | cifs_stats_bytes_written(tcon, total_written); |
1da177e4 | 2059 | |
7da4b49a | 2060 | if (total_written > 0) { |
2b0143b5 | 2061 | spin_lock(&d_inode(dentry)->i_lock); |
78c09634 | 2062 | if (*offset > d_inode(dentry)->i_size) { |
2b0143b5 | 2063 | i_size_write(d_inode(dentry), *offset); |
78c09634 RS |
2064 | d_inode(dentry)->i_blocks = (512 - 1 + *offset) >> 9; |
2065 | } | |
2b0143b5 | 2066 | spin_unlock(&d_inode(dentry)->i_lock); |
1da177e4 | 2067 | } |
2b0143b5 | 2068 | mark_inode_dirty_sync(d_inode(dentry)); |
6d5786a3 | 2069 | free_xid(xid); |
1da177e4 LT |
2070 | return total_written; |
2071 | } | |
2072 | ||
6508d904 JL |
2073 | struct cifsFileInfo *find_readable_file(struct cifsInodeInfo *cifs_inode, |
2074 | bool fsuid_only) | |
630f3f0c SF |
2075 | { |
2076 | struct cifsFileInfo *open_file = NULL; | |
874c8ca1 | 2077 | struct cifs_sb_info *cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb); |
6508d904 JL |
2078 | |
2079 | /* only filter by fsuid on multiuser mounts */ | |
2080 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
2081 | fsuid_only = false; | |
630f3f0c | 2082 | |
cb248819 | 2083 | spin_lock(&cifs_inode->open_file_lock); |
630f3f0c SF |
2084 | /* we could simply get the first_list_entry since write-only entries |
2085 | are always at the end of the list but since the first entry might | |
2086 | have a close pending, we go through the whole list */ | |
2087 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { | |
fef59fd7 | 2088 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6508d904 | 2089 | continue; |
2e396b83 | 2090 | if (OPEN_FMODE(open_file->f_flags) & FMODE_READ) { |
860b69a9 | 2091 | if ((!open_file->invalidHandle)) { |
630f3f0c SF |
2092 | /* found a good file */ |
2093 | /* lock it so it will not be closed on us */ | |
3afca265 | 2094 | cifsFileInfo_get(open_file); |
cb248819 | 2095 | spin_unlock(&cifs_inode->open_file_lock); |
630f3f0c SF |
2096 | return open_file; |
2097 | } /* else might as well continue, and look for | |
2098 | another, or simply have the caller reopen it | |
2099 | again rather than trying to fix this handle */ | |
2100 | } else /* write only file */ | |
2101 | break; /* write only files are last so must be done */ | |
2102 | } | |
cb248819 | 2103 | spin_unlock(&cifs_inode->open_file_lock); |
630f3f0c SF |
2104 | return NULL; |
2105 | } | |
630f3f0c | 2106 | |
fe768d51 PS |
2107 | /* Return -EBADF if no handle is found and general rc otherwise */ |
2108 | int | |
86f740f2 | 2109 | cifs_get_writable_file(struct cifsInodeInfo *cifs_inode, int flags, |
fe768d51 | 2110 | struct cifsFileInfo **ret_file) |
6148a742 | 2111 | { |
2c0c2a08 | 2112 | struct cifsFileInfo *open_file, *inv_file = NULL; |
d3892294 | 2113 | struct cifs_sb_info *cifs_sb; |
2846d386 | 2114 | bool any_available = false; |
fe768d51 | 2115 | int rc = -EBADF; |
2c0c2a08 | 2116 | unsigned int refind = 0; |
86f740f2 AA |
2117 | bool fsuid_only = flags & FIND_WR_FSUID_ONLY; |
2118 | bool with_delete = flags & FIND_WR_WITH_DELETE; | |
fe768d51 PS |
2119 | *ret_file = NULL; |
2120 | ||
2121 | /* | |
2122 | * Having a null inode here (because mapping->host was set to zero by | |
2123 | * the VFS or MM) should not happen but we had reports of on oops (due | |
2124 | * to it being zero) during stress testcases so we need to check for it | |
2125 | */ | |
60808233 | 2126 | |
fb8c4b14 | 2127 | if (cifs_inode == NULL) { |
f96637be | 2128 | cifs_dbg(VFS, "Null inode passed to cifs_writeable_file\n"); |
60808233 | 2129 | dump_stack(); |
fe768d51 | 2130 | return rc; |
60808233 SF |
2131 | } |
2132 | ||
874c8ca1 | 2133 | cifs_sb = CIFS_SB(cifs_inode->netfs.inode.i_sb); |
d3892294 | 2134 | |
6508d904 JL |
2135 | /* only filter by fsuid on multiuser mounts */ |
2136 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) | |
2137 | fsuid_only = false; | |
2138 | ||
cb248819 | 2139 | spin_lock(&cifs_inode->open_file_lock); |
9b22b0b7 | 2140 | refind_writable: |
2c0c2a08 | 2141 | if (refind > MAX_REOPEN_ATT) { |
cb248819 | 2142 | spin_unlock(&cifs_inode->open_file_lock); |
fe768d51 | 2143 | return rc; |
2c0c2a08 | 2144 | } |
6148a742 | 2145 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
6508d904 JL |
2146 | if (!any_available && open_file->pid != current->tgid) |
2147 | continue; | |
fef59fd7 | 2148 | if (fsuid_only && !uid_eq(open_file->uid, current_fsuid())) |
6148a742 | 2149 | continue; |
86f740f2 AA |
2150 | if (with_delete && !(open_file->fid.access & DELETE)) |
2151 | continue; | |
2e396b83 | 2152 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
9b22b0b7 SF |
2153 | if (!open_file->invalidHandle) { |
2154 | /* found a good writable file */ | |
3afca265 | 2155 | cifsFileInfo_get(open_file); |
cb248819 | 2156 | spin_unlock(&cifs_inode->open_file_lock); |
fe768d51 PS |
2157 | *ret_file = open_file; |
2158 | return 0; | |
2c0c2a08 SP |
2159 | } else { |
2160 | if (!inv_file) | |
2161 | inv_file = open_file; | |
9b22b0b7 | 2162 | } |
6148a742 SF |
2163 | } |
2164 | } | |
2846d386 JL |
2165 | /* couldn't find useable FH with same pid, try any available */ |
2166 | if (!any_available) { | |
2167 | any_available = true; | |
2168 | goto refind_writable; | |
2169 | } | |
2c0c2a08 SP |
2170 | |
2171 | if (inv_file) { | |
2172 | any_available = false; | |
3afca265 | 2173 | cifsFileInfo_get(inv_file); |
2c0c2a08 SP |
2174 | } |
2175 | ||
cb248819 | 2176 | spin_unlock(&cifs_inode->open_file_lock); |
2c0c2a08 SP |
2177 | |
2178 | if (inv_file) { | |
2179 | rc = cifs_reopen_file(inv_file, false); | |
fe768d51 PS |
2180 | if (!rc) { |
2181 | *ret_file = inv_file; | |
2182 | return 0; | |
2c0c2a08 | 2183 | } |
fe768d51 | 2184 | |
487317c9 | 2185 | spin_lock(&cifs_inode->open_file_lock); |
fe768d51 | 2186 | list_move_tail(&inv_file->flist, &cifs_inode->openFileList); |
487317c9 | 2187 | spin_unlock(&cifs_inode->open_file_lock); |
fe768d51 PS |
2188 | cifsFileInfo_put(inv_file); |
2189 | ++refind; | |
2190 | inv_file = NULL; | |
cb248819 | 2191 | spin_lock(&cifs_inode->open_file_lock); |
fe768d51 | 2192 | goto refind_writable; |
2c0c2a08 SP |
2193 | } |
2194 | ||
fe768d51 PS |
2195 | return rc; |
2196 | } | |
2197 | ||
2198 | struct cifsFileInfo * | |
86f740f2 | 2199 | find_writable_file(struct cifsInodeInfo *cifs_inode, int flags) |
fe768d51 PS |
2200 | { |
2201 | struct cifsFileInfo *cfile; | |
2202 | int rc; | |
2203 | ||
86f740f2 | 2204 | rc = cifs_get_writable_file(cifs_inode, flags, &cfile); |
fe768d51 | 2205 | if (rc) |
a0a3036b | 2206 | cifs_dbg(FYI, "Couldn't find writable handle rc=%d\n", rc); |
fe768d51 PS |
2207 | |
2208 | return cfile; | |
6148a742 SF |
2209 | } |
2210 | ||
8de9e86c RS |
2211 | int |
2212 | cifs_get_writable_path(struct cifs_tcon *tcon, const char *name, | |
86f740f2 | 2213 | int flags, |
8de9e86c RS |
2214 | struct cifsFileInfo **ret_file) |
2215 | { | |
8de9e86c | 2216 | struct cifsFileInfo *cfile; |
f6a9bc33 | 2217 | void *page = alloc_dentry_path(); |
8de9e86c RS |
2218 | |
2219 | *ret_file = NULL; | |
2220 | ||
2221 | spin_lock(&tcon->open_file_lock); | |
f6a9bc33 AV |
2222 | list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
2223 | struct cifsInodeInfo *cinode; | |
2224 | const char *full_path = build_path_from_dentry(cfile->dentry, page); | |
2225 | if (IS_ERR(full_path)) { | |
8de9e86c | 2226 | spin_unlock(&tcon->open_file_lock); |
f6a9bc33 AV |
2227 | free_dentry_path(page); |
2228 | return PTR_ERR(full_path); | |
8de9e86c | 2229 | } |
f6a9bc33 | 2230 | if (strcmp(full_path, name)) |
8de9e86c | 2231 | continue; |
8de9e86c | 2232 | |
8de9e86c RS |
2233 | cinode = CIFS_I(d_inode(cfile->dentry)); |
2234 | spin_unlock(&tcon->open_file_lock); | |
f6a9bc33 | 2235 | free_dentry_path(page); |
86f740f2 | 2236 | return cifs_get_writable_file(cinode, flags, ret_file); |
8de9e86c RS |
2237 | } |
2238 | ||
2239 | spin_unlock(&tcon->open_file_lock); | |
f6a9bc33 | 2240 | free_dentry_path(page); |
8de9e86c RS |
2241 | return -ENOENT; |
2242 | } | |
2243 | ||
496902dc RS |
2244 | int |
2245 | cifs_get_readable_path(struct cifs_tcon *tcon, const char *name, | |
2246 | struct cifsFileInfo **ret_file) | |
2247 | { | |
496902dc | 2248 | struct cifsFileInfo *cfile; |
f6a9bc33 | 2249 | void *page = alloc_dentry_path(); |
496902dc RS |
2250 | |
2251 | *ret_file = NULL; | |
2252 | ||
2253 | spin_lock(&tcon->open_file_lock); | |
f6a9bc33 AV |
2254 | list_for_each_entry(cfile, &tcon->openFileList, tlist) { |
2255 | struct cifsInodeInfo *cinode; | |
2256 | const char *full_path = build_path_from_dentry(cfile->dentry, page); | |
2257 | if (IS_ERR(full_path)) { | |
496902dc | 2258 | spin_unlock(&tcon->open_file_lock); |
f6a9bc33 AV |
2259 | free_dentry_path(page); |
2260 | return PTR_ERR(full_path); | |
496902dc | 2261 | } |
f6a9bc33 | 2262 | if (strcmp(full_path, name)) |
496902dc | 2263 | continue; |
496902dc | 2264 | |
496902dc RS |
2265 | cinode = CIFS_I(d_inode(cfile->dentry)); |
2266 | spin_unlock(&tcon->open_file_lock); | |
f6a9bc33 | 2267 | free_dentry_path(page); |
496902dc RS |
2268 | *ret_file = find_readable_file(cinode, 0); |
2269 | return *ret_file ? 0 : -ENOENT; | |
2270 | } | |
2271 | ||
2272 | spin_unlock(&tcon->open_file_lock); | |
f6a9bc33 | 2273 | free_dentry_path(page); |
496902dc RS |
2274 | return -ENOENT; |
2275 | } | |
2276 | ||
fb157ed2 SF |
2277 | void |
2278 | cifs_writedata_release(struct kref *refcount) | |
2279 | { | |
2280 | struct cifs_writedata *wdata = container_of(refcount, | |
2281 | struct cifs_writedata, refcount); | |
2282 | #ifdef CONFIG_CIFS_SMB_DIRECT | |
2283 | if (wdata->mr) { | |
2284 | smbd_deregister_mr(wdata->mr); | |
2285 | wdata->mr = NULL; | |
2286 | } | |
2287 | #endif | |
2288 | ||
2289 | if (wdata->cfile) | |
2290 | cifsFileInfo_put(wdata->cfile); | |
2291 | ||
2292 | kvfree(wdata->pages); | |
2293 | kfree(wdata); | |
2294 | } | |
2295 | ||
2296 | /* | |
2297 | * Write failed with a retryable error. Resend the write request. It's also | |
2298 | * possible that the page was redirtied so re-clean the page. | |
2299 | */ | |
2300 | static void | |
2301 | cifs_writev_requeue(struct cifs_writedata *wdata) | |
2302 | { | |
2303 | int i, rc = 0; | |
2304 | struct inode *inode = d_inode(wdata->cfile->dentry); | |
2305 | struct TCP_Server_Info *server; | |
2306 | unsigned int rest_len; | |
2307 | ||
2308 | server = tlink_tcon(wdata->cfile->tlink)->ses->server; | |
2309 | i = 0; | |
2310 | rest_len = wdata->bytes; | |
2311 | do { | |
2312 | struct cifs_writedata *wdata2; | |
2313 | unsigned int j, nr_pages, wsize, tailsz, cur_len; | |
2314 | ||
2315 | wsize = server->ops->wp_retry_size(inode); | |
2316 | if (wsize < rest_len) { | |
2317 | nr_pages = wsize / PAGE_SIZE; | |
2318 | if (!nr_pages) { | |
2319 | rc = -EOPNOTSUPP; | |
2320 | break; | |
2321 | } | |
2322 | cur_len = nr_pages * PAGE_SIZE; | |
2323 | tailsz = PAGE_SIZE; | |
2324 | } else { | |
2325 | nr_pages = DIV_ROUND_UP(rest_len, PAGE_SIZE); | |
2326 | cur_len = rest_len; | |
2327 | tailsz = rest_len - (nr_pages - 1) * PAGE_SIZE; | |
2328 | } | |
2329 | ||
2330 | wdata2 = cifs_writedata_alloc(nr_pages, cifs_writev_complete); | |
2331 | if (!wdata2) { | |
2332 | rc = -ENOMEM; | |
2333 | break; | |
2334 | } | |
2335 | ||
2336 | for (j = 0; j < nr_pages; j++) { | |
2337 | wdata2->pages[j] = wdata->pages[i + j]; | |
2338 | lock_page(wdata2->pages[j]); | |
2339 | clear_page_dirty_for_io(wdata2->pages[j]); | |
2340 | } | |
2341 | ||
2342 | wdata2->sync_mode = wdata->sync_mode; | |
2343 | wdata2->nr_pages = nr_pages; | |
2344 | wdata2->offset = page_offset(wdata2->pages[0]); | |
2345 | wdata2->pagesz = PAGE_SIZE; | |
2346 | wdata2->tailsz = tailsz; | |
2347 | wdata2->bytes = cur_len; | |
2348 | ||
2349 | rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, | |
2350 | &wdata2->cfile); | |
2351 | if (!wdata2->cfile) { | |
2352 | cifs_dbg(VFS, "No writable handle to retry writepages rc=%d\n", | |
2353 | rc); | |
2354 | if (!is_retryable_error(rc)) | |
2355 | rc = -EBADF; | |
2356 | } else { | |
2357 | wdata2->pid = wdata2->cfile->pid; | |
2358 | rc = server->ops->async_writev(wdata2, | |
2359 | cifs_writedata_release); | |
2360 | } | |
2361 | ||
2362 | for (j = 0; j < nr_pages; j++) { | |
2363 | unlock_page(wdata2->pages[j]); | |
2364 | if (rc != 0 && !is_retryable_error(rc)) { | |
2365 | SetPageError(wdata2->pages[j]); | |
2366 | end_page_writeback(wdata2->pages[j]); | |
2367 | put_page(wdata2->pages[j]); | |
2368 | } | |
2369 | } | |
2370 | ||
2371 | kref_put(&wdata2->refcount, cifs_writedata_release); | |
2372 | if (rc) { | |
2373 | if (is_retryable_error(rc)) | |
2374 | continue; | |
2375 | i += nr_pages; | |
2376 | break; | |
2377 | } | |
2378 | ||
2379 | rest_len -= cur_len; | |
2380 | i += nr_pages; | |
2381 | } while (i < wdata->nr_pages); | |
2382 | ||
2383 | /* cleanup remaining pages from the original wdata */ | |
2384 | for (; i < wdata->nr_pages; i++) { | |
2385 | SetPageError(wdata->pages[i]); | |
2386 | end_page_writeback(wdata->pages[i]); | |
2387 | put_page(wdata->pages[i]); | |
2388 | } | |
2389 | ||
2390 | if (rc != 0 && !is_retryable_error(rc)) | |
2391 | mapping_set_error(inode->i_mapping, rc); | |
2392 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2393 | } | |
2394 | ||
2395 | void | |
2396 | cifs_writev_complete(struct work_struct *work) | |
2397 | { | |
2398 | struct cifs_writedata *wdata = container_of(work, | |
2399 | struct cifs_writedata, work); | |
2400 | struct inode *inode = d_inode(wdata->cfile->dentry); | |
2401 | int i = 0; | |
2402 | ||
2403 | if (wdata->result == 0) { | |
2404 | spin_lock(&inode->i_lock); | |
2405 | cifs_update_eof(CIFS_I(inode), wdata->offset, wdata->bytes); | |
2406 | spin_unlock(&inode->i_lock); | |
2407 | cifs_stats_bytes_written(tlink_tcon(wdata->cfile->tlink), | |
2408 | wdata->bytes); | |
2409 | } else if (wdata->sync_mode == WB_SYNC_ALL && wdata->result == -EAGAIN) | |
2410 | return cifs_writev_requeue(wdata); | |
2411 | ||
2412 | for (i = 0; i < wdata->nr_pages; i++) { | |
2413 | struct page *page = wdata->pages[i]; | |
2414 | ||
2415 | if (wdata->result == -EAGAIN) | |
2416 | __set_page_dirty_nobuffers(page); | |
2417 | else if (wdata->result < 0) | |
2418 | SetPageError(page); | |
2419 | end_page_writeback(page); | |
2420 | cifs_readpage_to_fscache(inode, page); | |
2421 | put_page(page); | |
2422 | } | |
2423 | if (wdata->result != -EAGAIN) | |
2424 | mapping_set_error(inode->i_mapping, wdata->result); | |
2425 | kref_put(&wdata->refcount, cifs_writedata_release); | |
2426 | } | |
2427 | ||
2428 | struct cifs_writedata * | |
2429 | cifs_writedata_alloc(unsigned int nr_pages, work_func_t complete) | |
2430 | { | |
2431 | struct page **pages = | |
2432 | kcalloc(nr_pages, sizeof(struct page *), GFP_NOFS); | |
2433 | if (pages) | |
2434 | return cifs_writedata_direct_alloc(pages, complete); | |
2435 | ||
2436 | return NULL; | |
2437 | } | |
2438 | ||
2439 | struct cifs_writedata * | |
2440 | cifs_writedata_direct_alloc(struct page **pages, work_func_t complete) | |
2441 | { | |
2442 | struct cifs_writedata *wdata; | |
2443 | ||
2444 | wdata = kzalloc(sizeof(*wdata), GFP_NOFS); | |
2445 | if (wdata != NULL) { | |
2446 | wdata->pages = pages; | |
2447 | kref_init(&wdata->refcount); | |
2448 | INIT_LIST_HEAD(&wdata->list); | |
2449 | init_completion(&wdata->done); | |
2450 | INIT_WORK(&wdata->work, complete); | |
2451 | } | |
2452 | return wdata; | |
2453 | } | |
2454 | ||
2455 | ||
1da177e4 LT |
2456 | static int cifs_partialpagewrite(struct page *page, unsigned from, unsigned to) |
2457 | { | |
2458 | struct address_space *mapping = page->mapping; | |
09cbfeaf | 2459 | loff_t offset = (loff_t)page->index << PAGE_SHIFT; |
1da177e4 LT |
2460 | char *write_data; |
2461 | int rc = -EFAULT; | |
2462 | int bytes_written = 0; | |
1da177e4 | 2463 | struct inode *inode; |
6148a742 | 2464 | struct cifsFileInfo *open_file; |
1da177e4 LT |
2465 | |
2466 | if (!mapping || !mapping->host) | |
2467 | return -EFAULT; | |
2468 | ||
2469 | inode = page->mapping->host; | |
1da177e4 LT |
2470 | |
2471 | offset += (loff_t)from; | |
2472 | write_data = kmap(page); | |
2473 | write_data += from; | |
2474 | ||
09cbfeaf | 2475 | if ((to > PAGE_SIZE) || (from > to)) { |
1da177e4 LT |
2476 | kunmap(page); |
2477 | return -EIO; | |
2478 | } | |
2479 | ||
2480 | /* racing with truncate? */ | |
2481 | if (offset > mapping->host->i_size) { | |
2482 | kunmap(page); | |
2483 | return 0; /* don't care */ | |
2484 | } | |
2485 | ||
2486 | /* check to make sure that we are not extending the file */ | |
2487 | if (mapping->host->i_size - offset < (loff_t)to) | |
fb8c4b14 | 2488 | to = (unsigned)(mapping->host->i_size - offset); |
1da177e4 | 2489 | |
86f740f2 AA |
2490 | rc = cifs_get_writable_file(CIFS_I(mapping->host), FIND_WR_ANY, |
2491 | &open_file); | |
fe768d51 | 2492 | if (!rc) { |
fa2989f4 PS |
2493 | bytes_written = cifs_write(open_file, open_file->pid, |
2494 | write_data, to - from, &offset); | |
6ab409b5 | 2495 | cifsFileInfo_put(open_file); |
1da177e4 | 2496 | /* Does mm or vfs already set times? */ |
c2050a45 | 2497 | inode->i_atime = inode->i_mtime = current_time(inode); |
bb5a9a04 | 2498 | if ((bytes_written > 0) && (offset)) |
6148a742 | 2499 | rc = 0; |
bb5a9a04 SF |
2500 | else if (bytes_written < 0) |
2501 | rc = bytes_written; | |
fe768d51 PS |
2502 | else |
2503 | rc = -EFAULT; | |
6148a742 | 2504 | } else { |
fe768d51 PS |
2505 | cifs_dbg(FYI, "No writable handle for write page rc=%d\n", rc); |
2506 | if (!is_retryable_error(rc)) | |
2507 | rc = -EIO; | |
1da177e4 LT |
2508 | } |
2509 | ||
2510 | kunmap(page); | |
2511 | return rc; | |
2512 | } | |
2513 | ||
90ac1387 PS |
2514 | static struct cifs_writedata * |
2515 | wdata_alloc_and_fillpages(pgoff_t tofind, struct address_space *mapping, | |
2516 | pgoff_t end, pgoff_t *index, | |
2517 | unsigned int *found_pages) | |
2518 | { | |
90ac1387 PS |
2519 | struct cifs_writedata *wdata; |
2520 | ||
2521 | wdata = cifs_writedata_alloc((unsigned int)tofind, | |
2522 | cifs_writev_complete); | |
2523 | if (!wdata) | |
2524 | return NULL; | |
2525 | ||
9c19a9cb JK |
2526 | *found_pages = find_get_pages_range_tag(mapping, index, end, |
2527 | PAGECACHE_TAG_DIRTY, tofind, wdata->pages); | |
90ac1387 PS |
2528 | return wdata; |
2529 | } | |
2530 | ||
7e48ff82 PS |
2531 | static unsigned int |
2532 | wdata_prepare_pages(struct cifs_writedata *wdata, unsigned int found_pages, | |
2533 | struct address_space *mapping, | |
2534 | struct writeback_control *wbc, | |
2535 | pgoff_t end, pgoff_t *index, pgoff_t *next, bool *done) | |
2536 | { | |
2537 | unsigned int nr_pages = 0, i; | |
2538 | struct page *page; | |
2539 | ||
2540 | for (i = 0; i < found_pages; i++) { | |
2541 | page = wdata->pages[i]; | |
2542 | /* | |
b93b0163 MW |
2543 | * At this point we hold neither the i_pages lock nor the |
2544 | * page lock: the page may be truncated or invalidated | |
2545 | * (changing page->mapping to NULL), or even swizzled | |
2546 | * back from swapper_space to tmpfs file mapping | |
7e48ff82 PS |
2547 | */ |
2548 | ||
2549 | if (nr_pages == 0) | |
2550 | lock_page(page); | |
2551 | else if (!trylock_page(page)) | |
2552 | break; | |
2553 | ||
2554 | if (unlikely(page->mapping != mapping)) { | |
2555 | unlock_page(page); | |
2556 | break; | |
2557 | } | |
2558 | ||
2559 | if (!wbc->range_cyclic && page->index > end) { | |
2560 | *done = true; | |
2561 | unlock_page(page); | |
2562 | break; | |
2563 | } | |
2564 | ||
2565 | if (*next && (page->index != *next)) { | |
2566 | /* Not next consecutive page */ | |
2567 | unlock_page(page); | |
2568 | break; | |
2569 | } | |
2570 | ||
2571 | if (wbc->sync_mode != WB_SYNC_NONE) | |
2572 | wait_on_page_writeback(page); | |
2573 | ||
2574 | if (PageWriteback(page) || | |
2575 | !clear_page_dirty_for_io(page)) { | |
2576 | unlock_page(page); | |
2577 | break; | |
2578 | } | |
2579 | ||
2580 | /* | |
2581 | * This actually clears the dirty bit in the radix tree. | |
2582 | * See cifs_writepage() for more commentary. | |
2583 | */ | |
2584 | set_page_writeback(page); | |
2585 | if (page_offset(page) >= i_size_read(mapping->host)) { | |
2586 | *done = true; | |
2587 | unlock_page(page); | |
2588 | end_page_writeback(page); | |
2589 | break; | |
2590 | } | |
2591 | ||
2592 | wdata->pages[i] = page; | |
2593 | *next = page->index + 1; | |
2594 | ++nr_pages; | |
2595 | } | |
2596 | ||
2597 | /* reset index to refind any pages skipped */ | |
2598 | if (nr_pages == 0) | |
2599 | *index = wdata->pages[0]->index + 1; | |
2600 | ||
2601 | /* put any pages we aren't going to use */ | |
2602 | for (i = nr_pages; i < found_pages; i++) { | |
09cbfeaf | 2603 | put_page(wdata->pages[i]); |
7e48ff82 PS |
2604 | wdata->pages[i] = NULL; |
2605 | } | |
2606 | ||
2607 | return nr_pages; | |
2608 | } | |
2609 | ||
619aa48e | 2610 | static int |
c4b8f657 PS |
2611 | wdata_send_pages(struct cifs_writedata *wdata, unsigned int nr_pages, |
2612 | struct address_space *mapping, struct writeback_control *wbc) | |
619aa48e | 2613 | { |
258f0603 | 2614 | int rc; |
619aa48e PS |
2615 | |
2616 | wdata->sync_mode = wbc->sync_mode; | |
2617 | wdata->nr_pages = nr_pages; | |
2618 | wdata->offset = page_offset(wdata->pages[0]); | |
09cbfeaf | 2619 | wdata->pagesz = PAGE_SIZE; |
619aa48e PS |
2620 | wdata->tailsz = min(i_size_read(mapping->host) - |
2621 | page_offset(wdata->pages[nr_pages - 1]), | |
09cbfeaf KS |
2622 | (loff_t)PAGE_SIZE); |
2623 | wdata->bytes = ((nr_pages - 1) * PAGE_SIZE) + wdata->tailsz; | |
c4b8f657 | 2624 | wdata->pid = wdata->cfile->pid; |
619aa48e | 2625 | |
352d96f3 | 2626 | rc = adjust_credits(wdata->server, &wdata->credits, wdata->bytes); |
9a1c67e8 | 2627 | if (rc) |
258f0603 | 2628 | return rc; |
9a1c67e8 | 2629 | |
c4b8f657 PS |
2630 | if (wdata->cfile->invalidHandle) |
2631 | rc = -EAGAIN; | |
2632 | else | |
352d96f3 AA |
2633 | rc = wdata->server->ops->async_writev(wdata, |
2634 | cifs_writedata_release); | |
619aa48e | 2635 | |
619aa48e PS |
2636 | return rc; |
2637 | } | |
2638 | ||
1da177e4 | 2639 | static int cifs_writepages(struct address_space *mapping, |
37c0eb46 | 2640 | struct writeback_control *wbc) |
1da177e4 | 2641 | { |
c7d38dbe PS |
2642 | struct inode *inode = mapping->host; |
2643 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
cb7e9eab | 2644 | struct TCP_Server_Info *server; |
c3d17b63 JL |
2645 | bool done = false, scanned = false, range_whole = false; |
2646 | pgoff_t end, index; | |
2647 | struct cifs_writedata *wdata; | |
c7d38dbe | 2648 | struct cifsFileInfo *cfile = NULL; |
37c0eb46 | 2649 | int rc = 0; |
9a66396f | 2650 | int saved_rc = 0; |
0cb012d1 | 2651 | unsigned int xid; |
50c2f753 | 2652 | |
37c0eb46 | 2653 | /* |
c3d17b63 | 2654 | * If wsize is smaller than the page cache size, default to writing |
37c0eb46 SF |
2655 | * one page at a time via cifs_writepage |
2656 | */ | |
522aa3b5 | 2657 | if (cifs_sb->ctx->wsize < PAGE_SIZE) |
37c0eb46 SF |
2658 | return generic_writepages(mapping, wbc); |
2659 | ||
0cb012d1 | 2660 | xid = get_xid(); |
111ebb6e | 2661 | if (wbc->range_cyclic) { |
37c0eb46 | 2662 | index = mapping->writeback_index; /* Start from prev offset */ |
111ebb6e OH |
2663 | end = -1; |
2664 | } else { | |
09cbfeaf KS |
2665 | index = wbc->range_start >> PAGE_SHIFT; |
2666 | end = wbc->range_end >> PAGE_SHIFT; | |
111ebb6e | 2667 | if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX) |
c3d17b63 JL |
2668 | range_whole = true; |
2669 | scanned = true; | |
37c0eb46 | 2670 | } |
352d96f3 AA |
2671 | server = cifs_pick_channel(cifs_sb_master_tcon(cifs_sb)->ses); |
2672 | ||
37c0eb46 | 2673 | retry: |
c3d17b63 | 2674 | while (!done && index <= end) { |
335b7b62 | 2675 | unsigned int i, nr_pages, found_pages, wsize; |
66231a47 | 2676 | pgoff_t next = 0, tofind, saved_index = index; |
335b7b62 PS |
2677 | struct cifs_credits credits_on_stack; |
2678 | struct cifs_credits *credits = &credits_on_stack; | |
fe768d51 | 2679 | int get_file_rc = 0; |
c3d17b63 | 2680 | |
c7d38dbe PS |
2681 | if (cfile) |
2682 | cifsFileInfo_put(cfile); | |
2683 | ||
86f740f2 | 2684 | rc = cifs_get_writable_file(CIFS_I(inode), FIND_WR_ANY, &cfile); |
fe768d51 PS |
2685 | |
2686 | /* in case of an error store it to return later */ | |
2687 | if (rc) | |
2688 | get_file_rc = rc; | |
c7d38dbe | 2689 | |
522aa3b5 | 2690 | rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize, |
335b7b62 | 2691 | &wsize, credits); |
9a66396f PS |
2692 | if (rc != 0) { |
2693 | done = true; | |
cb7e9eab | 2694 | break; |
9a66396f | 2695 | } |
c3d17b63 | 2696 | |
09cbfeaf | 2697 | tofind = min((wsize / PAGE_SIZE) - 1, end - index) + 1; |
c3d17b63 | 2698 | |
90ac1387 PS |
2699 | wdata = wdata_alloc_and_fillpages(tofind, mapping, end, &index, |
2700 | &found_pages); | |
c3d17b63 JL |
2701 | if (!wdata) { |
2702 | rc = -ENOMEM; | |
9a66396f | 2703 | done = true; |
cb7e9eab | 2704 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2705 | break; |
2706 | } | |
2707 | ||
c3d17b63 JL |
2708 | if (found_pages == 0) { |
2709 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2710 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 JL |
2711 | break; |
2712 | } | |
2713 | ||
7e48ff82 PS |
2714 | nr_pages = wdata_prepare_pages(wdata, found_pages, mapping, wbc, |
2715 | end, &index, &next, &done); | |
37c0eb46 | 2716 | |
c3d17b63 JL |
2717 | /* nothing to write? */ |
2718 | if (nr_pages == 0) { | |
2719 | kref_put(&wdata->refcount, cifs_writedata_release); | |
cb7e9eab | 2720 | add_credits_and_wake_if(server, credits, 0); |
c3d17b63 | 2721 | continue; |
37c0eb46 | 2722 | } |
fbec9ab9 | 2723 | |
335b7b62 | 2724 | wdata->credits = credits_on_stack; |
c7d38dbe | 2725 | wdata->cfile = cfile; |
352d96f3 | 2726 | wdata->server = server; |
c7d38dbe | 2727 | cfile = NULL; |
941b853d | 2728 | |
c4b8f657 | 2729 | if (!wdata->cfile) { |
fe768d51 PS |
2730 | cifs_dbg(VFS, "No writable handle in writepages rc=%d\n", |
2731 | get_file_rc); | |
2732 | if (is_retryable_error(get_file_rc)) | |
2733 | rc = get_file_rc; | |
2734 | else | |
2735 | rc = -EBADF; | |
c4b8f657 PS |
2736 | } else |
2737 | rc = wdata_send_pages(wdata, nr_pages, mapping, wbc); | |
f3983c21 | 2738 | |
258f0603 PS |
2739 | for (i = 0; i < nr_pages; ++i) |
2740 | unlock_page(wdata->pages[i]); | |
2741 | ||
c3d17b63 JL |
2742 | /* send failure -- clean up the mess */ |
2743 | if (rc != 0) { | |
335b7b62 | 2744 | add_credits_and_wake_if(server, &wdata->credits, 0); |
c3d17b63 | 2745 | for (i = 0; i < nr_pages; ++i) { |
9a66396f | 2746 | if (is_retryable_error(rc)) |
c3d17b63 JL |
2747 | redirty_page_for_writepage(wbc, |
2748 | wdata->pages[i]); | |
2749 | else | |
2750 | SetPageError(wdata->pages[i]); | |
2751 | end_page_writeback(wdata->pages[i]); | |
09cbfeaf | 2752 | put_page(wdata->pages[i]); |
37c0eb46 | 2753 | } |
9a66396f | 2754 | if (!is_retryable_error(rc)) |
941b853d | 2755 | mapping_set_error(mapping, rc); |
c3d17b63 JL |
2756 | } |
2757 | kref_put(&wdata->refcount, cifs_writedata_release); | |
941b853d | 2758 | |
66231a47 PS |
2759 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) { |
2760 | index = saved_index; | |
2761 | continue; | |
2762 | } | |
2763 | ||
9a66396f PS |
2764 | /* Return immediately if we received a signal during writing */ |
2765 | if (is_interrupt_error(rc)) { | |
2766 | done = true; | |
2767 | break; | |
2768 | } | |
2769 | ||
2770 | if (rc != 0 && saved_rc == 0) | |
2771 | saved_rc = rc; | |
2772 | ||
c3d17b63 JL |
2773 | wbc->nr_to_write -= nr_pages; |
2774 | if (wbc->nr_to_write <= 0) | |
2775 | done = true; | |
b066a48c | 2776 | |
c3d17b63 | 2777 | index = next; |
37c0eb46 | 2778 | } |
c3d17b63 | 2779 | |
37c0eb46 SF |
2780 | if (!scanned && !done) { |
2781 | /* | |
2782 | * We hit the last page and there is more work to be done: wrap | |
2783 | * back to the start of the file | |
2784 | */ | |
c3d17b63 | 2785 | scanned = true; |
37c0eb46 SF |
2786 | index = 0; |
2787 | goto retry; | |
2788 | } | |
c3d17b63 | 2789 | |
9a66396f PS |
2790 | if (saved_rc != 0) |
2791 | rc = saved_rc; | |
2792 | ||
111ebb6e | 2793 | if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0)) |
37c0eb46 SF |
2794 | mapping->writeback_index = index; |
2795 | ||
c7d38dbe PS |
2796 | if (cfile) |
2797 | cifsFileInfo_put(cfile); | |
0cb012d1 | 2798 | free_xid(xid); |
c3f207ab RS |
2799 | /* Indication to update ctime and mtime as close is deferred */ |
2800 | set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags); | |
1da177e4 LT |
2801 | return rc; |
2802 | } | |
1da177e4 | 2803 | |
9ad1506b PS |
2804 | static int |
2805 | cifs_writepage_locked(struct page *page, struct writeback_control *wbc) | |
1da177e4 | 2806 | { |
9ad1506b | 2807 | int rc; |
6d5786a3 | 2808 | unsigned int xid; |
1da177e4 | 2809 | |
6d5786a3 | 2810 | xid = get_xid(); |
1da177e4 | 2811 | /* BB add check for wbc flags */ |
09cbfeaf | 2812 | get_page(page); |
ad7a2926 | 2813 | if (!PageUptodate(page)) |
f96637be | 2814 | cifs_dbg(FYI, "ppw - page not up to date\n"); |
cb876f45 LT |
2815 | |
2816 | /* | |
2817 | * Set the "writeback" flag, and clear "dirty" in the radix tree. | |
2818 | * | |
2819 | * A writepage() implementation always needs to do either this, | |
2820 | * or re-dirty the page with "redirty_page_for_writepage()" in | |
2821 | * the case of a failure. | |
2822 | * | |
2823 | * Just unlocking the page will cause the radix tree tag-bits | |
2824 | * to fail to update with the state of the page correctly. | |
2825 | */ | |
fb8c4b14 | 2826 | set_page_writeback(page); |
9ad1506b | 2827 | retry_write: |
09cbfeaf | 2828 | rc = cifs_partialpagewrite(page, 0, PAGE_SIZE); |
9a66396f PS |
2829 | if (is_retryable_error(rc)) { |
2830 | if (wbc->sync_mode == WB_SYNC_ALL && rc == -EAGAIN) | |
97b37f24 | 2831 | goto retry_write; |
9ad1506b | 2832 | redirty_page_for_writepage(wbc, page); |
97b37f24 | 2833 | } else if (rc != 0) { |
9ad1506b | 2834 | SetPageError(page); |
97b37f24 JL |
2835 | mapping_set_error(page->mapping, rc); |
2836 | } else { | |
9ad1506b | 2837 | SetPageUptodate(page); |
97b37f24 | 2838 | } |
cb876f45 | 2839 | end_page_writeback(page); |
09cbfeaf | 2840 | put_page(page); |
6d5786a3 | 2841 | free_xid(xid); |
1da177e4 LT |
2842 | return rc; |
2843 | } | |
2844 | ||
9ad1506b PS |
2845 | static int cifs_writepage(struct page *page, struct writeback_control *wbc) |
2846 | { | |
2847 | int rc = cifs_writepage_locked(page, wbc); | |
2848 | unlock_page(page); | |
2849 | return rc; | |
2850 | } | |
2851 | ||
d9414774 NP |
2852 | static int cifs_write_end(struct file *file, struct address_space *mapping, |
2853 | loff_t pos, unsigned len, unsigned copied, | |
2854 | struct page *page, void *fsdata) | |
1da177e4 | 2855 | { |
d9414774 NP |
2856 | int rc; |
2857 | struct inode *inode = mapping->host; | |
d4ffff1f PS |
2858 | struct cifsFileInfo *cfile = file->private_data; |
2859 | struct cifs_sb_info *cifs_sb = CIFS_SB(cfile->dentry->d_sb); | |
2860 | __u32 pid; | |
2861 | ||
2862 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
2863 | pid = cfile->pid; | |
2864 | else | |
2865 | pid = current->tgid; | |
1da177e4 | 2866 | |
f96637be | 2867 | cifs_dbg(FYI, "write_end for page %p from pos %lld with %d bytes\n", |
b6b38f70 | 2868 | page, pos, copied); |
d9414774 | 2869 | |
a98ee8c1 JL |
2870 | if (PageChecked(page)) { |
2871 | if (copied == len) | |
2872 | SetPageUptodate(page); | |
2873 | ClearPageChecked(page); | |
09cbfeaf | 2874 | } else if (!PageUptodate(page) && copied == PAGE_SIZE) |
d9414774 | 2875 | SetPageUptodate(page); |
ad7a2926 | 2876 | |
1da177e4 | 2877 | if (!PageUptodate(page)) { |
d9414774 | 2878 | char *page_data; |
09cbfeaf | 2879 | unsigned offset = pos & (PAGE_SIZE - 1); |
6d5786a3 | 2880 | unsigned int xid; |
d9414774 | 2881 | |
6d5786a3 | 2882 | xid = get_xid(); |
1da177e4 LT |
2883 | /* this is probably better than directly calling |
2884 | partialpage_write since in this function the file handle is | |
2885 | known which we might as well leverage */ | |
2886 | /* BB check if anything else missing out of ppw | |
2887 | such as updating last write time */ | |
2888 | page_data = kmap(page); | |
d4ffff1f | 2889 | rc = cifs_write(cfile, pid, page_data + offset, copied, &pos); |
d9414774 | 2890 | /* if (rc < 0) should we set writebehind rc? */ |
1da177e4 | 2891 | kunmap(page); |
d9414774 | 2892 | |
6d5786a3 | 2893 | free_xid(xid); |
fb8c4b14 | 2894 | } else { |
d9414774 NP |
2895 | rc = copied; |
2896 | pos += copied; | |
ca8aa29c | 2897 | set_page_dirty(page); |
1da177e4 LT |
2898 | } |
2899 | ||
d9414774 NP |
2900 | if (rc > 0) { |
2901 | spin_lock(&inode->i_lock); | |
78c09634 | 2902 | if (pos > inode->i_size) { |
d9414774 | 2903 | i_size_write(inode, pos); |
78c09634 RS |
2904 | inode->i_blocks = (512 - 1 + pos) >> 9; |
2905 | } | |
d9414774 NP |
2906 | spin_unlock(&inode->i_lock); |
2907 | } | |
2908 | ||
2909 | unlock_page(page); | |
09cbfeaf | 2910 | put_page(page); |
c3f207ab RS |
2911 | /* Indication to update ctime and mtime as close is deferred */ |
2912 | set_bit(CIFS_INO_MODIFIED_ATTR, &CIFS_I(inode)->flags); | |
d9414774 | 2913 | |
1da177e4 LT |
2914 | return rc; |
2915 | } | |
2916 | ||
02c24a82 JB |
2917 | int cifs_strict_fsync(struct file *file, loff_t start, loff_t end, |
2918 | int datasync) | |
1da177e4 | 2919 | { |
6d5786a3 | 2920 | unsigned int xid; |
1da177e4 | 2921 | int rc = 0; |
96daf2b0 | 2922 | struct cifs_tcon *tcon; |
1d8c4c00 | 2923 | struct TCP_Server_Info *server; |
c21dfb69 | 2924 | struct cifsFileInfo *smbfile = file->private_data; |
496ad9aa | 2925 | struct inode *inode = file_inode(file); |
8be7e6ba | 2926 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); |
1da177e4 | 2927 | |
3b49c9a1 | 2928 | rc = file_write_and_wait_range(file, start, end); |
2391ca41 SF |
2929 | if (rc) { |
2930 | trace_cifs_fsync_err(inode->i_ino, rc); | |
02c24a82 | 2931 | return rc; |
2391ca41 | 2932 | } |
02c24a82 | 2933 | |
6d5786a3 | 2934 | xid = get_xid(); |
1da177e4 | 2935 | |
35c265e0 AV |
2936 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
2937 | file, datasync); | |
50c2f753 | 2938 | |
18cceb6a | 2939 | if (!CIFS_CACHE_READ(CIFS_I(inode))) { |
4f73c7d3 | 2940 | rc = cifs_zap_mapping(inode); |
6feb9891 | 2941 | if (rc) { |
f96637be | 2942 | cifs_dbg(FYI, "rc: %d during invalidate phase\n", rc); |
6feb9891 PS |
2943 | rc = 0; /* don't care about it in fsync */ |
2944 | } | |
2945 | } | |
eb4b756b | 2946 | |
8be7e6ba | 2947 | tcon = tlink_tcon(smbfile->tlink); |
1d8c4c00 PS |
2948 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2949 | server = tcon->ses->server; | |
71e6864e | 2950 | if (server->ops->flush == NULL) { |
1d8c4c00 | 2951 | rc = -ENOSYS; |
71e6864e SF |
2952 | goto strict_fsync_exit; |
2953 | } | |
2954 | ||
2955 | if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) { | |
2956 | smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY); | |
2957 | if (smbfile) { | |
2958 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
2959 | cifsFileInfo_put(smbfile); | |
2960 | } else | |
2961 | cifs_dbg(FYI, "ignore fsync for file not open for write\n"); | |
2962 | } else | |
2963 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
1d8c4c00 | 2964 | } |
8be7e6ba | 2965 | |
71e6864e | 2966 | strict_fsync_exit: |
6d5786a3 | 2967 | free_xid(xid); |
8be7e6ba PS |
2968 | return rc; |
2969 | } | |
2970 | ||
02c24a82 | 2971 | int cifs_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
8be7e6ba | 2972 | { |
6d5786a3 | 2973 | unsigned int xid; |
8be7e6ba | 2974 | int rc = 0; |
96daf2b0 | 2975 | struct cifs_tcon *tcon; |
1d8c4c00 | 2976 | struct TCP_Server_Info *server; |
8be7e6ba | 2977 | struct cifsFileInfo *smbfile = file->private_data; |
71e6864e | 2978 | struct inode *inode = file_inode(file); |
7119e220 | 2979 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(file); |
02c24a82 | 2980 | |
3b49c9a1 | 2981 | rc = file_write_and_wait_range(file, start, end); |
f2bf09e9 SF |
2982 | if (rc) { |
2983 | trace_cifs_fsync_err(file_inode(file)->i_ino, rc); | |
02c24a82 | 2984 | return rc; |
f2bf09e9 | 2985 | } |
8be7e6ba | 2986 | |
6d5786a3 | 2987 | xid = get_xid(); |
8be7e6ba | 2988 | |
35c265e0 AV |
2989 | cifs_dbg(FYI, "Sync file - name: %pD datasync: 0x%x\n", |
2990 | file, datasync); | |
8be7e6ba PS |
2991 | |
2992 | tcon = tlink_tcon(smbfile->tlink); | |
1d8c4c00 PS |
2993 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC)) { |
2994 | server = tcon->ses->server; | |
71e6864e | 2995 | if (server->ops->flush == NULL) { |
1d8c4c00 | 2996 | rc = -ENOSYS; |
71e6864e SF |
2997 | goto fsync_exit; |
2998 | } | |
2999 | ||
3000 | if ((OPEN_FMODE(smbfile->f_flags) & FMODE_WRITE) == 0) { | |
3001 | smbfile = find_writable_file(CIFS_I(inode), FIND_WR_ANY); | |
3002 | if (smbfile) { | |
3003 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
3004 | cifsFileInfo_put(smbfile); | |
3005 | } else | |
3006 | cifs_dbg(FYI, "ignore fsync for file not open for write\n"); | |
3007 | } else | |
3008 | rc = server->ops->flush(xid, tcon, &smbfile->fid); | |
1d8c4c00 | 3009 | } |
b298f223 | 3010 | |
71e6864e | 3011 | fsync_exit: |
6d5786a3 | 3012 | free_xid(xid); |
1da177e4 LT |
3013 | return rc; |
3014 | } | |
3015 | ||
1da177e4 LT |
3016 | /* |
3017 | * As file closes, flush all cached write data for this inode checking | |
3018 | * for write behind errors. | |
3019 | */ | |
75e1fcc0 | 3020 | int cifs_flush(struct file *file, fl_owner_t id) |
1da177e4 | 3021 | { |
496ad9aa | 3022 | struct inode *inode = file_inode(file); |
1da177e4 LT |
3023 | int rc = 0; |
3024 | ||
eb4b756b | 3025 | if (file->f_mode & FMODE_WRITE) |
d3f1322a | 3026 | rc = filemap_write_and_wait(inode->i_mapping); |
50c2f753 | 3027 | |
f96637be | 3028 | cifs_dbg(FYI, "Flush inode %p file %p rc %d\n", inode, file, rc); |
2b058ace C |
3029 | if (rc) { |
3030 | /* get more nuanced writeback errors */ | |
3031 | rc = filemap_check_wb_err(file->f_mapping, 0); | |
f2bf09e9 | 3032 | trace_cifs_flush_err(inode->i_ino, rc); |
2b058ace | 3033 | } |
1da177e4 LT |
3034 | return rc; |
3035 | } | |
3036 | ||
72432ffc PS |
3037 | static int |
3038 | cifs_write_allocate_pages(struct page **pages, unsigned long num_pages) | |
3039 | { | |
3040 | int rc = 0; | |
3041 | unsigned long i; | |
3042 | ||
3043 | for (i = 0; i < num_pages; i++) { | |
e94f7ba1 | 3044 | pages[i] = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
72432ffc PS |
3045 | if (!pages[i]) { |
3046 | /* | |
3047 | * save number of pages we have already allocated and | |
3048 | * return with ENOMEM error | |
3049 | */ | |
3050 | num_pages = i; | |
3051 | rc = -ENOMEM; | |
e94f7ba1 | 3052 | break; |
72432ffc PS |
3053 | } |
3054 | } | |
3055 | ||
e94f7ba1 JL |
3056 | if (rc) { |
3057 | for (i = 0; i < num_pages; i++) | |
3058 | put_page(pages[i]); | |
3059 | } | |
72432ffc PS |
3060 | return rc; |
3061 | } | |
3062 | ||
3063 | static inline | |
3064 | size_t get_numpages(const size_t wsize, const size_t len, size_t *cur_len) | |
3065 | { | |
3066 | size_t num_pages; | |
3067 | size_t clen; | |
3068 | ||
3069 | clen = min_t(const size_t, len, wsize); | |
a7103b99 | 3070 | num_pages = DIV_ROUND_UP(clen, PAGE_SIZE); |
72432ffc PS |
3071 | |
3072 | if (cur_len) | |
3073 | *cur_len = clen; | |
3074 | ||
3075 | return num_pages; | |
3076 | } | |
3077 | ||
da82f7e7 | 3078 | static void |
4a5c80d7 | 3079 | cifs_uncached_writedata_release(struct kref *refcount) |
da82f7e7 JL |
3080 | { |
3081 | int i; | |
4a5c80d7 SF |
3082 | struct cifs_writedata *wdata = container_of(refcount, |
3083 | struct cifs_writedata, refcount); | |
3084 | ||
c610c4b6 | 3085 | kref_put(&wdata->ctx->refcount, cifs_aio_ctx_release); |
4a5c80d7 SF |
3086 | for (i = 0; i < wdata->nr_pages; i++) |
3087 | put_page(wdata->pages[i]); | |
3088 | cifs_writedata_release(refcount); | |
3089 | } | |
3090 | ||
c610c4b6 PS |
3091 | static void collect_uncached_write_data(struct cifs_aio_ctx *ctx); |
3092 | ||
4a5c80d7 SF |
3093 | static void |
3094 | cifs_uncached_writev_complete(struct work_struct *work) | |
3095 | { | |
da82f7e7 JL |
3096 | struct cifs_writedata *wdata = container_of(work, |
3097 | struct cifs_writedata, work); | |
2b0143b5 | 3098 | struct inode *inode = d_inode(wdata->cfile->dentry); |
da82f7e7 JL |
3099 | struct cifsInodeInfo *cifsi = CIFS_I(inode); |
3100 | ||
3101 | spin_lock(&inode->i_lock); | |
3102 | cifs_update_eof(cifsi, wdata->offset, wdata->bytes); | |
3103 | if (cifsi->server_eof > inode->i_size) | |
3104 | i_size_write(inode, cifsi->server_eof); | |
3105 | spin_unlock(&inode->i_lock); | |
3106 | ||
3107 | complete(&wdata->done); | |
c610c4b6 PS |
3108 | collect_uncached_write_data(wdata->ctx); |
3109 | /* the below call can possibly free the last ref to aio ctx */ | |
4a5c80d7 | 3110 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
da82f7e7 JL |
3111 | } |
3112 | ||
da82f7e7 | 3113 | static int |
66386c08 PS |
3114 | wdata_fill_from_iovec(struct cifs_writedata *wdata, struct iov_iter *from, |
3115 | size_t *len, unsigned long *num_pages) | |
da82f7e7 | 3116 | { |
66386c08 PS |
3117 | size_t save_len, copied, bytes, cur_len = *len; |
3118 | unsigned long i, nr_pages = *num_pages; | |
c9de5c80 | 3119 | |
66386c08 PS |
3120 | save_len = cur_len; |
3121 | for (i = 0; i < nr_pages; i++) { | |
3122 | bytes = min_t(const size_t, cur_len, PAGE_SIZE); | |
3123 | copied = copy_page_from_iter(wdata->pages[i], 0, bytes, from); | |
3124 | cur_len -= copied; | |
3125 | /* | |
3126 | * If we didn't copy as much as we expected, then that | |
3127 | * may mean we trod into an unmapped area. Stop copying | |
3128 | * at that point. On the next pass through the big | |
3129 | * loop, we'll likely end up getting a zero-length | |
3130 | * write and bailing out of it. | |
3131 | */ | |
3132 | if (copied < bytes) | |
3133 | break; | |
3134 | } | |
3135 | cur_len = save_len - cur_len; | |
3136 | *len = cur_len; | |
da82f7e7 | 3137 | |
66386c08 PS |
3138 | /* |
3139 | * If we have no data to send, then that probably means that | |
3140 | * the copy above failed altogether. That's most likely because | |
3141 | * the address in the iovec was bogus. Return -EFAULT and let | |
3142 | * the caller free anything we allocated and bail out. | |
3143 | */ | |
3144 | if (!cur_len) | |
3145 | return -EFAULT; | |
da82f7e7 | 3146 | |
66386c08 PS |
3147 | /* |
3148 | * i + 1 now represents the number of pages we actually used in | |
3149 | * the copy phase above. | |
3150 | */ | |
3151 | *num_pages = i + 1; | |
3152 | return 0; | |
da82f7e7 JL |
3153 | } |
3154 | ||
8c5f9c1a LL |
3155 | static int |
3156 | cifs_resend_wdata(struct cifs_writedata *wdata, struct list_head *wdata_list, | |
3157 | struct cifs_aio_ctx *ctx) | |
3158 | { | |
335b7b62 PS |
3159 | unsigned int wsize; |
3160 | struct cifs_credits credits; | |
8c5f9c1a | 3161 | int rc; |
352d96f3 | 3162 | struct TCP_Server_Info *server = wdata->server; |
8c5f9c1a | 3163 | |
8c5f9c1a | 3164 | do { |
d53e292f LL |
3165 | if (wdata->cfile->invalidHandle) { |
3166 | rc = cifs_reopen_file(wdata->cfile, false); | |
3167 | if (rc == -EAGAIN) | |
3168 | continue; | |
3169 | else if (rc) | |
3170 | break; | |
3171 | } | |
8c5f9c1a | 3172 | |
8c5f9c1a | 3173 | |
d53e292f LL |
3174 | /* |
3175 | * Wait for credits to resend this wdata. | |
3176 | * Note: we are attempting to resend the whole wdata not in | |
3177 | * segments | |
3178 | */ | |
3179 | do { | |
3180 | rc = server->ops->wait_mtu_credits(server, wdata->bytes, | |
3181 | &wsize, &credits); | |
3182 | if (rc) | |
3183 | goto fail; | |
3184 | ||
3185 | if (wsize < wdata->bytes) { | |
3186 | add_credits_and_wake_if(server, &credits, 0); | |
3187 | msleep(1000); | |
3188 | } | |
3189 | } while (wsize < wdata->bytes); | |
3190 | wdata->credits = credits; | |
8c5f9c1a | 3191 | |
d53e292f LL |
3192 | rc = adjust_credits(server, &wdata->credits, wdata->bytes); |
3193 | ||
3194 | if (!rc) { | |
3195 | if (wdata->cfile->invalidHandle) | |
3196 | rc = -EAGAIN; | |
b7a55bbd LL |
3197 | else { |
3198 | #ifdef CONFIG_CIFS_SMB_DIRECT | |
3199 | if (wdata->mr) { | |
3200 | wdata->mr->need_invalidate = true; | |
3201 | smbd_deregister_mr(wdata->mr); | |
3202 | wdata->mr = NULL; | |
3203 | } | |
3204 | #endif | |
d53e292f | 3205 | rc = server->ops->async_writev(wdata, |
8c5f9c1a | 3206 | cifs_uncached_writedata_release); |
b7a55bbd | 3207 | } |
d53e292f | 3208 | } |
8c5f9c1a | 3209 | |
d53e292f LL |
3210 | /* If the write was successfully sent, we are done */ |
3211 | if (!rc) { | |
3212 | list_add_tail(&wdata->list, wdata_list); | |
3213 | return 0; | |
3214 | } | |
8c5f9c1a | 3215 | |
d53e292f LL |
3216 | /* Roll back credits and retry if needed */ |
3217 | add_credits_and_wake_if(server, &wdata->credits, 0); | |
3218 | } while (rc == -EAGAIN); | |
8c5f9c1a | 3219 | |
d53e292f LL |
3220 | fail: |
3221 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); | |
8c5f9c1a LL |
3222 | return rc; |
3223 | } | |
3224 | ||
43de94ea PS |
3225 | static int |
3226 | cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from, | |
3227 | struct cifsFileInfo *open_file, | |
c610c4b6 PS |
3228 | struct cifs_sb_info *cifs_sb, struct list_head *wdata_list, |
3229 | struct cifs_aio_ctx *ctx) | |
72432ffc | 3230 | { |
43de94ea PS |
3231 | int rc = 0; |
3232 | size_t cur_len; | |
66386c08 | 3233 | unsigned long nr_pages, num_pages, i; |
43de94ea | 3234 | struct cifs_writedata *wdata; |
fc56b983 | 3235 | struct iov_iter saved_from = *from; |
6ec0b01b | 3236 | loff_t saved_offset = offset; |
da82f7e7 | 3237 | pid_t pid; |
6ec0b01b | 3238 | struct TCP_Server_Info *server; |
8c5f9c1a LL |
3239 | struct page **pagevec; |
3240 | size_t start; | |
335b7b62 | 3241 | unsigned int xid; |
d4ffff1f PS |
3242 | |
3243 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) | |
3244 | pid = open_file->pid; | |
3245 | else | |
3246 | pid = current->tgid; | |
3247 | ||
352d96f3 | 3248 | server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses); |
335b7b62 | 3249 | xid = get_xid(); |
6ec0b01b | 3250 | |
72432ffc | 3251 | do { |
335b7b62 PS |
3252 | unsigned int wsize; |
3253 | struct cifs_credits credits_on_stack; | |
3254 | struct cifs_credits *credits = &credits_on_stack; | |
cb7e9eab | 3255 | |
3e952994 PS |
3256 | if (open_file->invalidHandle) { |
3257 | rc = cifs_reopen_file(open_file, false); | |
3258 | if (rc == -EAGAIN) | |
3259 | continue; | |
3260 | else if (rc) | |
3261 | break; | |
3262 | } | |
3263 | ||
522aa3b5 | 3264 | rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize, |
335b7b62 | 3265 | &wsize, credits); |
cb7e9eab PS |
3266 | if (rc) |
3267 | break; | |
da82f7e7 | 3268 | |
b6bc8a7b LL |
3269 | cur_len = min_t(const size_t, len, wsize); |
3270 | ||
8c5f9c1a | 3271 | if (ctx->direct_io) { |
b98e26df SF |
3272 | ssize_t result; |
3273 | ||
1ef255e2 | 3274 | result = iov_iter_get_pages_alloc2( |
b6bc8a7b | 3275 | from, &pagevec, cur_len, &start); |
b98e26df | 3276 | if (result < 0) { |
8c5f9c1a | 3277 | cifs_dbg(VFS, |
a0a3036b JP |
3278 | "direct_writev couldn't get user pages (rc=%zd) iter type %d iov_offset %zd count %zd\n", |
3279 | result, iov_iter_type(from), | |
3280 | from->iov_offset, from->count); | |
8c5f9c1a | 3281 | dump_stack(); |
54e94ff9 LL |
3282 | |
3283 | rc = result; | |
3284 | add_credits_and_wake_if(server, credits, 0); | |
8c5f9c1a LL |
3285 | break; |
3286 | } | |
b98e26df | 3287 | cur_len = (size_t)result; |
8c5f9c1a LL |
3288 | |
3289 | nr_pages = | |
3290 | (cur_len + start + PAGE_SIZE - 1) / PAGE_SIZE; | |
3291 | ||
3292 | wdata = cifs_writedata_direct_alloc(pagevec, | |
da82f7e7 | 3293 | cifs_uncached_writev_complete); |
8c5f9c1a LL |
3294 | if (!wdata) { |
3295 | rc = -ENOMEM; | |
3296 | add_credits_and_wake_if(server, credits, 0); | |
3297 | break; | |
3298 | } | |
da82f7e7 | 3299 | |
da82f7e7 | 3300 | |
8c5f9c1a LL |
3301 | wdata->page_offset = start; |
3302 | wdata->tailsz = | |
3303 | nr_pages > 1 ? | |
3304 | cur_len - (PAGE_SIZE - start) - | |
3305 | (nr_pages - 2) * PAGE_SIZE : | |
3306 | cur_len; | |
3307 | } else { | |
3308 | nr_pages = get_numpages(wsize, len, &cur_len); | |
3309 | wdata = cifs_writedata_alloc(nr_pages, | |
3310 | cifs_uncached_writev_complete); | |
3311 | if (!wdata) { | |
3312 | rc = -ENOMEM; | |
3313 | add_credits_and_wake_if(server, credits, 0); | |
3314 | break; | |
3315 | } | |
5d81de8e | 3316 | |
8c5f9c1a LL |
3317 | rc = cifs_write_allocate_pages(wdata->pages, nr_pages); |
3318 | if (rc) { | |
9bda8723 | 3319 | kvfree(wdata->pages); |
8c5f9c1a LL |
3320 | kfree(wdata); |
3321 | add_credits_and_wake_if(server, credits, 0); | |
3322 | break; | |
3323 | } | |
3324 | ||
3325 | num_pages = nr_pages; | |
3326 | rc = wdata_fill_from_iovec( | |
3327 | wdata, from, &cur_len, &num_pages); | |
3328 | if (rc) { | |
3329 | for (i = 0; i < nr_pages; i++) | |
3330 | put_page(wdata->pages[i]); | |
9bda8723 | 3331 | kvfree(wdata->pages); |
8c5f9c1a LL |
3332 | kfree(wdata); |
3333 | add_credits_and_wake_if(server, credits, 0); | |
3334 | break; | |
3335 | } | |
3336 | ||
3337 | /* | |
3338 | * Bring nr_pages down to the number of pages we | |
3339 | * actually used, and free any pages that we didn't use. | |
3340 | */ | |
3341 | for ( ; nr_pages > num_pages; nr_pages--) | |
3342 | put_page(wdata->pages[nr_pages - 1]); | |
3343 | ||
3344 | wdata->tailsz = cur_len - ((nr_pages - 1) * PAGE_SIZE); | |
3345 | } | |
5d81de8e | 3346 | |
da82f7e7 JL |
3347 | wdata->sync_mode = WB_SYNC_ALL; |
3348 | wdata->nr_pages = nr_pages; | |
3349 | wdata->offset = (__u64)offset; | |
3350 | wdata->cfile = cifsFileInfo_get(open_file); | |
352d96f3 | 3351 | wdata->server = server; |
da82f7e7 JL |
3352 | wdata->pid = pid; |
3353 | wdata->bytes = cur_len; | |
eddb079d | 3354 | wdata->pagesz = PAGE_SIZE; |
335b7b62 | 3355 | wdata->credits = credits_on_stack; |
c610c4b6 PS |
3356 | wdata->ctx = ctx; |
3357 | kref_get(&ctx->refcount); | |
6ec0b01b | 3358 | |
9a1c67e8 PS |
3359 | rc = adjust_credits(server, &wdata->credits, wdata->bytes); |
3360 | ||
3361 | if (!rc) { | |
3362 | if (wdata->cfile->invalidHandle) | |
3e952994 PS |
3363 | rc = -EAGAIN; |
3364 | else | |
9a1c67e8 | 3365 | rc = server->ops->async_writev(wdata, |
6ec0b01b | 3366 | cifs_uncached_writedata_release); |
9a1c67e8 PS |
3367 | } |
3368 | ||
da82f7e7 | 3369 | if (rc) { |
335b7b62 | 3370 | add_credits_and_wake_if(server, &wdata->credits, 0); |
4a5c80d7 SF |
3371 | kref_put(&wdata->refcount, |
3372 | cifs_uncached_writedata_release); | |
6ec0b01b | 3373 | if (rc == -EAGAIN) { |
fc56b983 | 3374 | *from = saved_from; |
6ec0b01b PS |
3375 | iov_iter_advance(from, offset - saved_offset); |
3376 | continue; | |
3377 | } | |
72432ffc PS |
3378 | break; |
3379 | } | |
3380 | ||
43de94ea | 3381 | list_add_tail(&wdata->list, wdata_list); |
da82f7e7 JL |
3382 | offset += cur_len; |
3383 | len -= cur_len; | |
72432ffc PS |
3384 | } while (len > 0); |
3385 | ||
335b7b62 | 3386 | free_xid(xid); |
43de94ea PS |
3387 | return rc; |
3388 | } | |
3389 | ||
c610c4b6 | 3390 | static void collect_uncached_write_data(struct cifs_aio_ctx *ctx) |
43de94ea | 3391 | { |
c610c4b6 | 3392 | struct cifs_writedata *wdata, *tmp; |
43de94ea PS |
3393 | struct cifs_tcon *tcon; |
3394 | struct cifs_sb_info *cifs_sb; | |
c610c4b6 | 3395 | struct dentry *dentry = ctx->cfile->dentry; |
e946d3c8 | 3396 | ssize_t rc; |
43de94ea | 3397 | |
c610c4b6 PS |
3398 | tcon = tlink_tcon(ctx->cfile->tlink); |
3399 | cifs_sb = CIFS_SB(dentry->d_sb); | |
43de94ea | 3400 | |
c610c4b6 | 3401 | mutex_lock(&ctx->aio_mutex); |
43de94ea | 3402 | |
c610c4b6 PS |
3403 | if (list_empty(&ctx->list)) { |
3404 | mutex_unlock(&ctx->aio_mutex); | |
3405 | return; | |
3406 | } | |
da82f7e7 | 3407 | |
c610c4b6 | 3408 | rc = ctx->rc; |
da82f7e7 JL |
3409 | /* |
3410 | * Wait for and collect replies for any successful sends in order of | |
c610c4b6 PS |
3411 | * increasing offset. Once an error is hit, then return without waiting |
3412 | * for any more replies. | |
da82f7e7 JL |
3413 | */ |
3414 | restart_loop: | |
c610c4b6 | 3415 | list_for_each_entry_safe(wdata, tmp, &ctx->list, list) { |
da82f7e7 | 3416 | if (!rc) { |
c610c4b6 PS |
3417 | if (!try_wait_for_completion(&wdata->done)) { |
3418 | mutex_unlock(&ctx->aio_mutex); | |
3419 | return; | |
3420 | } | |
3421 | ||
3422 | if (wdata->result) | |
da82f7e7 JL |
3423 | rc = wdata->result; |
3424 | else | |
c610c4b6 | 3425 | ctx->total_len += wdata->bytes; |
da82f7e7 JL |
3426 | |
3427 | /* resend call if it's a retryable error */ | |
3428 | if (rc == -EAGAIN) { | |
6ec0b01b | 3429 | struct list_head tmp_list; |
c610c4b6 | 3430 | struct iov_iter tmp_from = ctx->iter; |
6ec0b01b PS |
3431 | |
3432 | INIT_LIST_HEAD(&tmp_list); | |
3433 | list_del_init(&wdata->list); | |
3434 | ||
8c5f9c1a LL |
3435 | if (ctx->direct_io) |
3436 | rc = cifs_resend_wdata( | |
3437 | wdata, &tmp_list, ctx); | |
3438 | else { | |
3439 | iov_iter_advance(&tmp_from, | |
c610c4b6 | 3440 | wdata->offset - ctx->pos); |
6ec0b01b | 3441 | |
8c5f9c1a | 3442 | rc = cifs_write_from_iter(wdata->offset, |
6ec0b01b | 3443 | wdata->bytes, &tmp_from, |
c610c4b6 PS |
3444 | ctx->cfile, cifs_sb, &tmp_list, |
3445 | ctx); | |
d53e292f LL |
3446 | |
3447 | kref_put(&wdata->refcount, | |
3448 | cifs_uncached_writedata_release); | |
8c5f9c1a | 3449 | } |
6ec0b01b | 3450 | |
c610c4b6 | 3451 | list_splice(&tmp_list, &ctx->list); |
da82f7e7 JL |
3452 | goto restart_loop; |
3453 | } | |
3454 | } | |
3455 | list_del_init(&wdata->list); | |
4a5c80d7 | 3456 | kref_put(&wdata->refcount, cifs_uncached_writedata_release); |
72432ffc PS |
3457 | } |
3458 | ||
c610c4b6 PS |
3459 | cifs_stats_bytes_written(tcon, ctx->total_len); |
3460 | set_bit(CIFS_INO_INVALID_MAPPING, &CIFS_I(dentry->d_inode)->flags); | |
3461 | ||
3462 | ctx->rc = (rc == 0) ? ctx->total_len : rc; | |
3463 | ||
3464 | mutex_unlock(&ctx->aio_mutex); | |
3465 | ||
3466 | if (ctx->iocb && ctx->iocb->ki_complete) | |
6b19b766 | 3467 | ctx->iocb->ki_complete(ctx->iocb, ctx->rc); |
c610c4b6 PS |
3468 | else |
3469 | complete(&ctx->done); | |
3470 | } | |
3471 | ||
8c5f9c1a LL |
3472 | static ssize_t __cifs_writev( |
3473 | struct kiocb *iocb, struct iov_iter *from, bool direct) | |
c610c4b6 PS |
3474 | { |
3475 | struct file *file = iocb->ki_filp; | |
3476 | ssize_t total_written = 0; | |
3477 | struct cifsFileInfo *cfile; | |
3478 | struct cifs_tcon *tcon; | |
3479 | struct cifs_sb_info *cifs_sb; | |
3480 | struct cifs_aio_ctx *ctx; | |
3481 | struct iov_iter saved_from = *from; | |
8c5f9c1a | 3482 | size_t len = iov_iter_count(from); |
c610c4b6 PS |
3483 | int rc; |
3484 | ||
3485 | /* | |
8c5f9c1a LL |
3486 | * iov_iter_get_pages_alloc doesn't work with ITER_KVEC. |
3487 | * In this case, fall back to non-direct write function. | |
3488 | * this could be improved by getting pages directly in ITER_KVEC | |
c610c4b6 | 3489 | */ |
6629400a | 3490 | if (direct && iov_iter_is_kvec(from)) { |
8c5f9c1a LL |
3491 | cifs_dbg(FYI, "use non-direct cifs_writev for kvec I/O\n"); |
3492 | direct = false; | |
3493 | } | |
c610c4b6 PS |
3494 | |
3495 | rc = generic_write_checks(iocb, from); | |
3496 | if (rc <= 0) | |
3497 | return rc; | |
3498 | ||
3499 | cifs_sb = CIFS_FILE_SB(file); | |
3500 | cfile = file->private_data; | |
3501 | tcon = tlink_tcon(cfile->tlink); | |
3502 | ||
3503 | if (!tcon->ses->server->ops->async_writev) | |
3504 | return -ENOSYS; | |
3505 | ||
3506 | ctx = cifs_aio_ctx_alloc(); | |
3507 | if (!ctx) | |
3508 | return -ENOMEM; | |
3509 | ||
3510 | ctx->cfile = cifsFileInfo_get(cfile); | |
3511 | ||
3512 | if (!is_sync_kiocb(iocb)) | |
3513 | ctx->iocb = iocb; | |
3514 | ||
3515 | ctx->pos = iocb->ki_pos; | |
3516 | ||
8c5f9c1a LL |
3517 | if (direct) { |
3518 | ctx->direct_io = true; | |
3519 | ctx->iter = *from; | |
3520 | ctx->len = len; | |
3521 | } else { | |
3522 | rc = setup_aio_ctx_iter(ctx, from, WRITE); | |
3523 | if (rc) { | |
3524 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3525 | return rc; | |
3526 | } | |
c610c4b6 PS |
3527 | } |
3528 | ||
3529 | /* grab a lock here due to read response handlers can access ctx */ | |
3530 | mutex_lock(&ctx->aio_mutex); | |
3531 | ||
3532 | rc = cifs_write_from_iter(iocb->ki_pos, ctx->len, &saved_from, | |
3533 | cfile, cifs_sb, &ctx->list, ctx); | |
3534 | ||
3535 | /* | |
3536 | * If at least one write was successfully sent, then discard any rc | |
3537 | * value from the later writes. If the other write succeeds, then | |
3538 | * we'll end up returning whatever was written. If it fails, then | |
3539 | * we'll get a new rc value from that. | |
3540 | */ | |
3541 | if (!list_empty(&ctx->list)) | |
3542 | rc = 0; | |
3543 | ||
3544 | mutex_unlock(&ctx->aio_mutex); | |
3545 | ||
3546 | if (rc) { | |
3547 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3548 | return rc; | |
3549 | } | |
3550 | ||
3551 | if (!is_sync_kiocb(iocb)) { | |
3552 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3553 | return -EIOCBQUEUED; | |
3554 | } | |
3555 | ||
3556 | rc = wait_for_completion_killable(&ctx->done); | |
3557 | if (rc) { | |
3558 | mutex_lock(&ctx->aio_mutex); | |
3559 | ctx->rc = rc = -EINTR; | |
3560 | total_written = ctx->total_len; | |
3561 | mutex_unlock(&ctx->aio_mutex); | |
3562 | } else { | |
3563 | rc = ctx->rc; | |
3564 | total_written = ctx->total_len; | |
3565 | } | |
3566 | ||
3567 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
3568 | ||
e9d1593d AV |
3569 | if (unlikely(!total_written)) |
3570 | return rc; | |
72432ffc | 3571 | |
e9d1593d | 3572 | iocb->ki_pos += total_written; |
e9d1593d | 3573 | return total_written; |
72432ffc PS |
3574 | } |
3575 | ||
8c5f9c1a LL |
3576 | ssize_t cifs_direct_writev(struct kiocb *iocb, struct iov_iter *from) |
3577 | { | |
7500a992 RS |
3578 | struct file *file = iocb->ki_filp; |
3579 | ||
3580 | cifs_revalidate_mapping(file->f_inode); | |
8c5f9c1a LL |
3581 | return __cifs_writev(iocb, from, true); |
3582 | } | |
3583 | ||
3584 | ssize_t cifs_user_writev(struct kiocb *iocb, struct iov_iter *from) | |
3585 | { | |
3586 | return __cifs_writev(iocb, from, false); | |
3587 | } | |
3588 | ||
579f9053 | 3589 | static ssize_t |
3dae8750 | 3590 | cifs_writev(struct kiocb *iocb, struct iov_iter *from) |
72432ffc | 3591 | { |
579f9053 PS |
3592 | struct file *file = iocb->ki_filp; |
3593 | struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data; | |
3594 | struct inode *inode = file->f_mapping->host; | |
3595 | struct cifsInodeInfo *cinode = CIFS_I(inode); | |
3596 | struct TCP_Server_Info *server = tlink_tcon(cfile->tlink)->ses->server; | |
5f380c7f | 3597 | ssize_t rc; |
72432ffc | 3598 | |
966681c9 | 3599 | inode_lock(inode); |
579f9053 PS |
3600 | /* |
3601 | * We need to hold the sem to be sure nobody modifies lock list | |
3602 | * with a brlock that prevents writing. | |
3603 | */ | |
3604 | down_read(&cinode->lock_sem); | |
5f380c7f | 3605 | |
3309dd04 AV |
3606 | rc = generic_write_checks(iocb, from); |
3607 | if (rc <= 0) | |
5f380c7f AV |
3608 | goto out; |
3609 | ||
5f380c7f | 3610 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(from), |
9645759c RS |
3611 | server->vals->exclusive_lock_type, 0, |
3612 | NULL, CIFS_WRITE_OP)) | |
3dae8750 | 3613 | rc = __generic_file_write_iter(iocb, from); |
5f380c7f AV |
3614 | else |
3615 | rc = -EACCES; | |
3616 | out: | |
966681c9 | 3617 | up_read(&cinode->lock_sem); |
5955102c | 3618 | inode_unlock(inode); |
19dfc1f5 | 3619 | |
e2592217 CH |
3620 | if (rc > 0) |
3621 | rc = generic_write_sync(iocb, rc); | |
579f9053 PS |
3622 | return rc; |
3623 | } | |
3624 | ||
3625 | ssize_t | |
3dae8750 | 3626 | cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) |
579f9053 | 3627 | { |
496ad9aa | 3628 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
3629 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
3630 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
3631 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
3632 | iocb->ki_filp->private_data; | |
3633 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
88cf75aa | 3634 | ssize_t written; |
ca8aa29c | 3635 | |
c11f1df5 SP |
3636 | written = cifs_get_writer(cinode); |
3637 | if (written) | |
3638 | return written; | |
3639 | ||
18cceb6a | 3640 | if (CIFS_CACHE_WRITE(cinode)) { |
88cf75aa PS |
3641 | if (cap_unix(tcon->ses) && |
3642 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) | |
c11f1df5 | 3643 | && ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) { |
3dae8750 | 3644 | written = generic_file_write_iter(iocb, from); |
c11f1df5 SP |
3645 | goto out; |
3646 | } | |
3dae8750 | 3647 | written = cifs_writev(iocb, from); |
c11f1df5 | 3648 | goto out; |
25078105 | 3649 | } |
25078105 | 3650 | /* |
ca8aa29c PS |
3651 | * For non-oplocked files in strict cache mode we need to write the data |
3652 | * to the server exactly from the pos to pos+len-1 rather than flush all | |
3653 | * affected pages because it may cause a error with mandatory locks on | |
3654 | * these pages but not on the region from pos to ppos+len-1. | |
72432ffc | 3655 | */ |
3dae8750 | 3656 | written = cifs_user_writev(iocb, from); |
6dfbd846 | 3657 | if (CIFS_CACHE_READ(cinode)) { |
88cf75aa | 3658 | /* |
6dfbd846 PS |
3659 | * We have read level caching and we have just sent a write |
3660 | * request to the server thus making data in the cache stale. | |
3661 | * Zap the cache and set oplock/lease level to NONE to avoid | |
3662 | * reading stale data from the cache. All subsequent read | |
3663 | * operations will read new data from the server. | |
88cf75aa | 3664 | */ |
4f73c7d3 | 3665 | cifs_zap_mapping(inode); |
6dfbd846 | 3666 | cifs_dbg(FYI, "Set Oplock/Lease to NONE for inode=%p after write\n", |
f96637be | 3667 | inode); |
18cceb6a | 3668 | cinode->oplock = 0; |
88cf75aa | 3669 | } |
c11f1df5 SP |
3670 | out: |
3671 | cifs_put_writer(cinode); | |
88cf75aa | 3672 | return written; |
72432ffc PS |
3673 | } |
3674 | ||
0471ca3f | 3675 | static struct cifs_readdata * |
f9f5aca1 | 3676 | cifs_readdata_direct_alloc(struct page **pages, work_func_t complete) |
0471ca3f JL |
3677 | { |
3678 | struct cifs_readdata *rdata; | |
f4e49cd2 | 3679 | |
f9f5aca1 | 3680 | rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); |
0471ca3f | 3681 | if (rdata != NULL) { |
f9f5aca1 | 3682 | rdata->pages = pages; |
6993f74a | 3683 | kref_init(&rdata->refcount); |
1c892549 JL |
3684 | INIT_LIST_HEAD(&rdata->list); |
3685 | init_completion(&rdata->done); | |
0471ca3f | 3686 | INIT_WORK(&rdata->work, complete); |
0471ca3f | 3687 | } |
f4e49cd2 | 3688 | |
0471ca3f JL |
3689 | return rdata; |
3690 | } | |
3691 | ||
f9f5aca1 LL |
3692 | static struct cifs_readdata * |
3693 | cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) | |
3694 | { | |
3695 | struct page **pages = | |
6396bb22 | 3696 | kcalloc(nr_pages, sizeof(struct page *), GFP_KERNEL); |
f9f5aca1 LL |
3697 | struct cifs_readdata *ret = NULL; |
3698 | ||
3699 | if (pages) { | |
3700 | ret = cifs_readdata_direct_alloc(pages, complete); | |
3701 | if (!ret) | |
3702 | kfree(pages); | |
3703 | } | |
3704 | ||
3705 | return ret; | |
3706 | } | |
3707 | ||
6993f74a JL |
3708 | void |
3709 | cifs_readdata_release(struct kref *refcount) | |
0471ca3f | 3710 | { |
6993f74a JL |
3711 | struct cifs_readdata *rdata = container_of(refcount, |
3712 | struct cifs_readdata, refcount); | |
bd3dcc6a LL |
3713 | #ifdef CONFIG_CIFS_SMB_DIRECT |
3714 | if (rdata->mr) { | |
3715 | smbd_deregister_mr(rdata->mr); | |
3716 | rdata->mr = NULL; | |
3717 | } | |
3718 | #endif | |
6993f74a JL |
3719 | if (rdata->cfile) |
3720 | cifsFileInfo_put(rdata->cfile); | |
3721 | ||
f9f5aca1 | 3722 | kvfree(rdata->pages); |
0471ca3f JL |
3723 | kfree(rdata); |
3724 | } | |
3725 | ||
1c892549 | 3726 | static int |
c5fab6f4 | 3727 | cifs_read_allocate_pages(struct cifs_readdata *rdata, unsigned int nr_pages) |
1c892549 JL |
3728 | { |
3729 | int rc = 0; | |
c5fab6f4 | 3730 | struct page *page; |
1c892549 JL |
3731 | unsigned int i; |
3732 | ||
c5fab6f4 | 3733 | for (i = 0; i < nr_pages; i++) { |
1c892549 JL |
3734 | page = alloc_page(GFP_KERNEL|__GFP_HIGHMEM); |
3735 | if (!page) { | |
3736 | rc = -ENOMEM; | |
3737 | break; | |
3738 | } | |
c5fab6f4 | 3739 | rdata->pages[i] = page; |
1c892549 JL |
3740 | } |
3741 | ||
3742 | if (rc) { | |
31fad7d4 RBC |
3743 | unsigned int nr_page_failed = i; |
3744 | ||
3745 | for (i = 0; i < nr_page_failed; i++) { | |
c5fab6f4 JL |
3746 | put_page(rdata->pages[i]); |
3747 | rdata->pages[i] = NULL; | |
1c892549 JL |
3748 | } |
3749 | } | |
3750 | return rc; | |
3751 | } | |
3752 | ||
3753 | static void | |
3754 | cifs_uncached_readdata_release(struct kref *refcount) | |
3755 | { | |
1c892549 JL |
3756 | struct cifs_readdata *rdata = container_of(refcount, |
3757 | struct cifs_readdata, refcount); | |
c5fab6f4 | 3758 | unsigned int i; |
1c892549 | 3759 | |
6685c5e2 | 3760 | kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release); |
c5fab6f4 JL |
3761 | for (i = 0; i < rdata->nr_pages; i++) { |
3762 | put_page(rdata->pages[i]); | |
1c892549 JL |
3763 | } |
3764 | cifs_readdata_release(refcount); | |
3765 | } | |
3766 | ||
1c892549 JL |
3767 | /** |
3768 | * cifs_readdata_to_iov - copy data from pages in response to an iovec | |
3769 | * @rdata: the readdata response with list of pages holding data | |
7f25bba8 | 3770 | * @iter: destination for our data |
1c892549 JL |
3771 | * |
3772 | * This function copies data from a list of pages in a readdata response into | |
3773 | * an array of iovecs. It will first calculate where the data should go | |
3774 | * based on the info in the readdata and then copy the data into that spot. | |
3775 | */ | |
7f25bba8 AV |
3776 | static int |
3777 | cifs_readdata_to_iov(struct cifs_readdata *rdata, struct iov_iter *iter) | |
1c892549 | 3778 | { |
34a54d61 | 3779 | size_t remaining = rdata->got_bytes; |
c5fab6f4 | 3780 | unsigned int i; |
1c892549 | 3781 | |
c5fab6f4 | 3782 | for (i = 0; i < rdata->nr_pages; i++) { |
c5fab6f4 | 3783 | struct page *page = rdata->pages[i]; |
e686bd8d | 3784 | size_t copy = min_t(size_t, remaining, PAGE_SIZE); |
9c25702c PS |
3785 | size_t written; |
3786 | ||
00e23707 | 3787 | if (unlikely(iov_iter_is_pipe(iter))) { |
9c25702c PS |
3788 | void *addr = kmap_atomic(page); |
3789 | ||
3790 | written = copy_to_iter(addr, copy, iter); | |
3791 | kunmap_atomic(addr); | |
3792 | } else | |
3793 | written = copy_page_to_iter(page, 0, copy, iter); | |
7f25bba8 AV |
3794 | remaining -= written; |
3795 | if (written < copy && iov_iter_count(iter) > 0) | |
3796 | break; | |
1c892549 | 3797 | } |
7f25bba8 | 3798 | return remaining ? -EFAULT : 0; |
1c892549 JL |
3799 | } |
3800 | ||
6685c5e2 PS |
3801 | static void collect_uncached_read_data(struct cifs_aio_ctx *ctx); |
3802 | ||
1c892549 JL |
3803 | static void |
3804 | cifs_uncached_readv_complete(struct work_struct *work) | |
3805 | { | |
3806 | struct cifs_readdata *rdata = container_of(work, | |
3807 | struct cifs_readdata, work); | |
1c892549 JL |
3808 | |
3809 | complete(&rdata->done); | |
6685c5e2 PS |
3810 | collect_uncached_read_data(rdata->ctx); |
3811 | /* the below call can possibly free the last ref to aio ctx */ | |
1c892549 JL |
3812 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); |
3813 | } | |
3814 | ||
3815 | static int | |
d70b9104 PS |
3816 | uncached_fill_pages(struct TCP_Server_Info *server, |
3817 | struct cifs_readdata *rdata, struct iov_iter *iter, | |
3818 | unsigned int len) | |
1c892549 | 3819 | { |
b3160aeb | 3820 | int result = 0; |
c5fab6f4 JL |
3821 | unsigned int i; |
3822 | unsigned int nr_pages = rdata->nr_pages; | |
1dbe3466 | 3823 | unsigned int page_offset = rdata->page_offset; |
1c892549 | 3824 | |
b3160aeb | 3825 | rdata->got_bytes = 0; |
8321fec4 | 3826 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
3827 | for (i = 0; i < nr_pages; i++) { |
3828 | struct page *page = rdata->pages[i]; | |
71335664 | 3829 | size_t n; |
1dbe3466 LL |
3830 | unsigned int segment_size = rdata->pagesz; |
3831 | ||
3832 | if (i == 0) | |
3833 | segment_size -= page_offset; | |
3834 | else | |
3835 | page_offset = 0; | |
3836 | ||
c5fab6f4 | 3837 | |
71335664 | 3838 | if (len <= 0) { |
1c892549 | 3839 | /* no need to hold page hostage */ |
c5fab6f4 JL |
3840 | rdata->pages[i] = NULL; |
3841 | rdata->nr_pages--; | |
1c892549 | 3842 | put_page(page); |
8321fec4 | 3843 | continue; |
1c892549 | 3844 | } |
1dbe3466 | 3845 | |
71335664 | 3846 | n = len; |
1dbe3466 | 3847 | if (len >= segment_size) |
71335664 | 3848 | /* enough data to fill the page */ |
1dbe3466 LL |
3849 | n = segment_size; |
3850 | else | |
71335664 | 3851 | rdata->tailsz = len; |
1dbe3466 LL |
3852 | len -= n; |
3853 | ||
d70b9104 | 3854 | if (iter) |
1dbe3466 LL |
3855 | result = copy_page_from_iter( |
3856 | page, page_offset, n, iter); | |
bd3dcc6a LL |
3857 | #ifdef CONFIG_CIFS_SMB_DIRECT |
3858 | else if (rdata->mr) | |
3859 | result = n; | |
3860 | #endif | |
d70b9104 | 3861 | else |
1dbe3466 LL |
3862 | result = cifs_read_page_from_socket( |
3863 | server, page, page_offset, n); | |
8321fec4 JL |
3864 | if (result < 0) |
3865 | break; | |
3866 | ||
b3160aeb | 3867 | rdata->got_bytes += result; |
1c892549 JL |
3868 | } |
3869 | ||
b3160aeb PS |
3870 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
3871 | rdata->got_bytes : result; | |
1c892549 JL |
3872 | } |
3873 | ||
d70b9104 PS |
3874 | static int |
3875 | cifs_uncached_read_into_pages(struct TCP_Server_Info *server, | |
3876 | struct cifs_readdata *rdata, unsigned int len) | |
3877 | { | |
3878 | return uncached_fill_pages(server, rdata, NULL, len); | |
3879 | } | |
3880 | ||
3881 | static int | |
3882 | cifs_uncached_copy_into_pages(struct TCP_Server_Info *server, | |
3883 | struct cifs_readdata *rdata, | |
3884 | struct iov_iter *iter) | |
3885 | { | |
3886 | return uncached_fill_pages(server, rdata, iter, iter->count); | |
3887 | } | |
3888 | ||
6e6e2b86 LL |
3889 | static int cifs_resend_rdata(struct cifs_readdata *rdata, |
3890 | struct list_head *rdata_list, | |
3891 | struct cifs_aio_ctx *ctx) | |
3892 | { | |
335b7b62 PS |
3893 | unsigned int rsize; |
3894 | struct cifs_credits credits; | |
6e6e2b86 | 3895 | int rc; |
352d96f3 AA |
3896 | struct TCP_Server_Info *server; |
3897 | ||
3898 | /* XXX: should we pick a new channel here? */ | |
3899 | server = rdata->server; | |
6e6e2b86 | 3900 | |
6e6e2b86 | 3901 | do { |
0b0dfd59 LL |
3902 | if (rdata->cfile->invalidHandle) { |
3903 | rc = cifs_reopen_file(rdata->cfile, true); | |
3904 | if (rc == -EAGAIN) | |
3905 | continue; | |
3906 | else if (rc) | |
3907 | break; | |
3908 | } | |
3909 | ||
3910 | /* | |
3911 | * Wait for credits to resend this rdata. | |
3912 | * Note: we are attempting to resend the whole rdata not in | |
3913 | * segments | |
3914 | */ | |
3915 | do { | |
3916 | rc = server->ops->wait_mtu_credits(server, rdata->bytes, | |
6e6e2b86 LL |
3917 | &rsize, &credits); |
3918 | ||
0b0dfd59 LL |
3919 | if (rc) |
3920 | goto fail; | |
6e6e2b86 | 3921 | |
0b0dfd59 LL |
3922 | if (rsize < rdata->bytes) { |
3923 | add_credits_and_wake_if(server, &credits, 0); | |
3924 | msleep(1000); | |
3925 | } | |
3926 | } while (rsize < rdata->bytes); | |
3927 | rdata->credits = credits; | |
6e6e2b86 | 3928 | |
0b0dfd59 LL |
3929 | rc = adjust_credits(server, &rdata->credits, rdata->bytes); |
3930 | if (!rc) { | |
3931 | if (rdata->cfile->invalidHandle) | |
3932 | rc = -EAGAIN; | |
b7a55bbd LL |
3933 | else { |
3934 | #ifdef CONFIG_CIFS_SMB_DIRECT | |
3935 | if (rdata->mr) { | |
3936 | rdata->mr->need_invalidate = true; | |
3937 | smbd_deregister_mr(rdata->mr); | |
3938 | rdata->mr = NULL; | |
3939 | } | |
3940 | #endif | |
0b0dfd59 | 3941 | rc = server->ops->async_readv(rdata); |
b7a55bbd | 3942 | } |
0b0dfd59 | 3943 | } |
6e6e2b86 | 3944 | |
0b0dfd59 LL |
3945 | /* If the read was successfully sent, we are done */ |
3946 | if (!rc) { | |
3947 | /* Add to aio pending list */ | |
3948 | list_add_tail(&rdata->list, rdata_list); | |
3949 | return 0; | |
3950 | } | |
6e6e2b86 | 3951 | |
0b0dfd59 LL |
3952 | /* Roll back credits and retry if needed */ |
3953 | add_credits_and_wake_if(server, &rdata->credits, 0); | |
3954 | } while (rc == -EAGAIN); | |
6e6e2b86 | 3955 | |
0b0dfd59 LL |
3956 | fail: |
3957 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
6e6e2b86 LL |
3958 | return rc; |
3959 | } | |
3960 | ||
0ada36b2 PS |
3961 | static int |
3962 | cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, | |
6685c5e2 PS |
3963 | struct cifs_sb_info *cifs_sb, struct list_head *rdata_list, |
3964 | struct cifs_aio_ctx *ctx) | |
1da177e4 | 3965 | { |
0ada36b2 | 3966 | struct cifs_readdata *rdata; |
335b7b62 PS |
3967 | unsigned int npages, rsize; |
3968 | struct cifs_credits credits_on_stack; | |
3969 | struct cifs_credits *credits = &credits_on_stack; | |
0ada36b2 PS |
3970 | size_t cur_len; |
3971 | int rc; | |
1c892549 | 3972 | pid_t pid; |
25f40259 | 3973 | struct TCP_Server_Info *server; |
6e6e2b86 LL |
3974 | struct page **pagevec; |
3975 | size_t start; | |
3976 | struct iov_iter direct_iov = ctx->iter; | |
a70307ee | 3977 | |
352d96f3 | 3978 | server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses); |
fc9c5966 | 3979 | |
d4ffff1f PS |
3980 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
3981 | pid = open_file->pid; | |
3982 | else | |
3983 | pid = current->tgid; | |
3984 | ||
6e6e2b86 LL |
3985 | if (ctx->direct_io) |
3986 | iov_iter_advance(&direct_iov, offset - ctx->pos); | |
3987 | ||
1c892549 | 3988 | do { |
3e952994 PS |
3989 | if (open_file->invalidHandle) { |
3990 | rc = cifs_reopen_file(open_file, true); | |
3991 | if (rc == -EAGAIN) | |
3992 | continue; | |
3993 | else if (rc) | |
3994 | break; | |
3995 | } | |
3996 | ||
06a46656 RS |
3997 | if (cifs_sb->ctx->rsize == 0) |
3998 | cifs_sb->ctx->rsize = | |
3999 | server->ops->negotiate_rsize(tlink_tcon(open_file->tlink), | |
4000 | cifs_sb->ctx); | |
4001 | ||
522aa3b5 | 4002 | rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, |
335b7b62 | 4003 | &rsize, credits); |
bed9da02 PS |
4004 | if (rc) |
4005 | break; | |
4006 | ||
4007 | cur_len = min_t(const size_t, len, rsize); | |
a70307ee | 4008 | |
6e6e2b86 | 4009 | if (ctx->direct_io) { |
b98e26df | 4010 | ssize_t result; |
6e6e2b86 | 4011 | |
1ef255e2 | 4012 | result = iov_iter_get_pages_alloc2( |
6e6e2b86 LL |
4013 | &direct_iov, &pagevec, |
4014 | cur_len, &start); | |
b98e26df | 4015 | if (result < 0) { |
6e6e2b86 | 4016 | cifs_dbg(VFS, |
a0a3036b JP |
4017 | "Couldn't get user pages (rc=%zd) iter type %d iov_offset %zd count %zd\n", |
4018 | result, iov_iter_type(&direct_iov), | |
4019 | direct_iov.iov_offset, | |
4020 | direct_iov.count); | |
6e6e2b86 | 4021 | dump_stack(); |
54e94ff9 LL |
4022 | |
4023 | rc = result; | |
4024 | add_credits_and_wake_if(server, credits, 0); | |
6e6e2b86 LL |
4025 | break; |
4026 | } | |
b98e26df | 4027 | cur_len = (size_t)result; |
6e6e2b86 LL |
4028 | |
4029 | rdata = cifs_readdata_direct_alloc( | |
4030 | pagevec, cifs_uncached_readv_complete); | |
4031 | if (!rdata) { | |
4032 | add_credits_and_wake_if(server, credits, 0); | |
4033 | rc = -ENOMEM; | |
4034 | break; | |
4035 | } | |
4036 | ||
4037 | npages = (cur_len + start + PAGE_SIZE-1) / PAGE_SIZE; | |
4038 | rdata->page_offset = start; | |
4039 | rdata->tailsz = npages > 1 ? | |
4040 | cur_len-(PAGE_SIZE-start)-(npages-2)*PAGE_SIZE : | |
4041 | cur_len; | |
4042 | ||
4043 | } else { | |
4044 | ||
4045 | npages = DIV_ROUND_UP(cur_len, PAGE_SIZE); | |
4046 | /* allocate a readdata struct */ | |
4047 | rdata = cifs_readdata_alloc(npages, | |
1c892549 | 4048 | cifs_uncached_readv_complete); |
6e6e2b86 LL |
4049 | if (!rdata) { |
4050 | add_credits_and_wake_if(server, credits, 0); | |
4051 | rc = -ENOMEM; | |
4052 | break; | |
4053 | } | |
a70307ee | 4054 | |
6e6e2b86 | 4055 | rc = cifs_read_allocate_pages(rdata, npages); |
9bda8723 PS |
4056 | if (rc) { |
4057 | kvfree(rdata->pages); | |
4058 | kfree(rdata); | |
4059 | add_credits_and_wake_if(server, credits, 0); | |
4060 | break; | |
4061 | } | |
6e6e2b86 LL |
4062 | |
4063 | rdata->tailsz = PAGE_SIZE; | |
4064 | } | |
1c892549 | 4065 | |
352d96f3 | 4066 | rdata->server = server; |
1c892549 | 4067 | rdata->cfile = cifsFileInfo_get(open_file); |
c5fab6f4 | 4068 | rdata->nr_pages = npages; |
1c892549 JL |
4069 | rdata->offset = offset; |
4070 | rdata->bytes = cur_len; | |
4071 | rdata->pid = pid; | |
8321fec4 JL |
4072 | rdata->pagesz = PAGE_SIZE; |
4073 | rdata->read_into_pages = cifs_uncached_read_into_pages; | |
d70b9104 | 4074 | rdata->copy_into_pages = cifs_uncached_copy_into_pages; |
335b7b62 | 4075 | rdata->credits = credits_on_stack; |
6685c5e2 PS |
4076 | rdata->ctx = ctx; |
4077 | kref_get(&ctx->refcount); | |
1c892549 | 4078 | |
9a1c67e8 PS |
4079 | rc = adjust_credits(server, &rdata->credits, rdata->bytes); |
4080 | ||
4081 | if (!rc) { | |
4082 | if (rdata->cfile->invalidHandle) | |
3e952994 PS |
4083 | rc = -EAGAIN; |
4084 | else | |
9a1c67e8 PS |
4085 | rc = server->ops->async_readv(rdata); |
4086 | } | |
4087 | ||
1c892549 | 4088 | if (rc) { |
335b7b62 | 4089 | add_credits_and_wake_if(server, &rdata->credits, 0); |
1c892549 | 4090 | kref_put(&rdata->refcount, |
6e6e2b86 LL |
4091 | cifs_uncached_readdata_release); |
4092 | if (rc == -EAGAIN) { | |
4093 | iov_iter_revert(&direct_iov, cur_len); | |
25f40259 | 4094 | continue; |
6e6e2b86 | 4095 | } |
1c892549 JL |
4096 | break; |
4097 | } | |
4098 | ||
0ada36b2 | 4099 | list_add_tail(&rdata->list, rdata_list); |
1c892549 JL |
4100 | offset += cur_len; |
4101 | len -= cur_len; | |
4102 | } while (len > 0); | |
4103 | ||
0ada36b2 PS |
4104 | return rc; |
4105 | } | |
4106 | ||
6685c5e2 PS |
4107 | static void |
4108 | collect_uncached_read_data(struct cifs_aio_ctx *ctx) | |
0ada36b2 | 4109 | { |
6685c5e2 PS |
4110 | struct cifs_readdata *rdata, *tmp; |
4111 | struct iov_iter *to = &ctx->iter; | |
0ada36b2 | 4112 | struct cifs_sb_info *cifs_sb; |
6685c5e2 | 4113 | int rc; |
0ada36b2 | 4114 | |
6685c5e2 | 4115 | cifs_sb = CIFS_SB(ctx->cfile->dentry->d_sb); |
0ada36b2 | 4116 | |
6685c5e2 | 4117 | mutex_lock(&ctx->aio_mutex); |
0ada36b2 | 4118 | |
6685c5e2 PS |
4119 | if (list_empty(&ctx->list)) { |
4120 | mutex_unlock(&ctx->aio_mutex); | |
4121 | return; | |
4122 | } | |
1c892549 | 4123 | |
6685c5e2 | 4124 | rc = ctx->rc; |
1c892549 | 4125 | /* the loop below should proceed in the order of increasing offsets */ |
25f40259 | 4126 | again: |
6685c5e2 | 4127 | list_for_each_entry_safe(rdata, tmp, &ctx->list, list) { |
1c892549 | 4128 | if (!rc) { |
6685c5e2 PS |
4129 | if (!try_wait_for_completion(&rdata->done)) { |
4130 | mutex_unlock(&ctx->aio_mutex); | |
4131 | return; | |
4132 | } | |
4133 | ||
4134 | if (rdata->result == -EAGAIN) { | |
74027f4a | 4135 | /* resend call if it's a retryable error */ |
fb8a3e52 | 4136 | struct list_head tmp_list; |
d913ed17 | 4137 | unsigned int got_bytes = rdata->got_bytes; |
25f40259 | 4138 | |
fb8a3e52 PS |
4139 | list_del_init(&rdata->list); |
4140 | INIT_LIST_HEAD(&tmp_list); | |
25f40259 | 4141 | |
d913ed17 PS |
4142 | /* |
4143 | * Got a part of data and then reconnect has | |
4144 | * happened -- fill the buffer and continue | |
4145 | * reading. | |
4146 | */ | |
4147 | if (got_bytes && got_bytes < rdata->bytes) { | |
6e6e2b86 LL |
4148 | rc = 0; |
4149 | if (!ctx->direct_io) | |
4150 | rc = cifs_readdata_to_iov(rdata, to); | |
d913ed17 PS |
4151 | if (rc) { |
4152 | kref_put(&rdata->refcount, | |
6e6e2b86 | 4153 | cifs_uncached_readdata_release); |
d913ed17 PS |
4154 | continue; |
4155 | } | |
74027f4a | 4156 | } |
d913ed17 | 4157 | |
6e6e2b86 LL |
4158 | if (ctx->direct_io) { |
4159 | /* | |
4160 | * Re-use rdata as this is a | |
4161 | * direct I/O | |
4162 | */ | |
4163 | rc = cifs_resend_rdata( | |
4164 | rdata, | |
4165 | &tmp_list, ctx); | |
4166 | } else { | |
4167 | rc = cifs_send_async_read( | |
d913ed17 PS |
4168 | rdata->offset + got_bytes, |
4169 | rdata->bytes - got_bytes, | |
4170 | rdata->cfile, cifs_sb, | |
6685c5e2 | 4171 | &tmp_list, ctx); |
25f40259 | 4172 | |
6e6e2b86 LL |
4173 | kref_put(&rdata->refcount, |
4174 | cifs_uncached_readdata_release); | |
4175 | } | |
4176 | ||
6685c5e2 | 4177 | list_splice(&tmp_list, &ctx->list); |
25f40259 | 4178 | |
fb8a3e52 PS |
4179 | goto again; |
4180 | } else if (rdata->result) | |
4181 | rc = rdata->result; | |
6e6e2b86 | 4182 | else if (!ctx->direct_io) |
e6a7bcb4 | 4183 | rc = cifs_readdata_to_iov(rdata, to); |
1c892549 | 4184 | |
2e8a05d8 PS |
4185 | /* if there was a short read -- discard anything left */ |
4186 | if (rdata->got_bytes && rdata->got_bytes < rdata->bytes) | |
4187 | rc = -ENODATA; | |
6e6e2b86 LL |
4188 | |
4189 | ctx->total_len += rdata->got_bytes; | |
1da177e4 | 4190 | } |
1c892549 JL |
4191 | list_del_init(&rdata->list); |
4192 | kref_put(&rdata->refcount, cifs_uncached_readdata_release); | |
1da177e4 | 4193 | } |
a70307ee | 4194 | |
13f5938d | 4195 | if (!ctx->direct_io) |
6e6e2b86 | 4196 | ctx->total_len = ctx->len - iov_iter_count(to); |
6685c5e2 | 4197 | |
09a4707e PS |
4198 | /* mask nodata case */ |
4199 | if (rc == -ENODATA) | |
4200 | rc = 0; | |
4201 | ||
97adda8b | 4202 | ctx->rc = (rc == 0) ? (ssize_t)ctx->total_len : rc; |
6685c5e2 PS |
4203 | |
4204 | mutex_unlock(&ctx->aio_mutex); | |
4205 | ||
4206 | if (ctx->iocb && ctx->iocb->ki_complete) | |
6b19b766 | 4207 | ctx->iocb->ki_complete(ctx->iocb, ctx->rc); |
6685c5e2 PS |
4208 | else |
4209 | complete(&ctx->done); | |
4210 | } | |
4211 | ||
6e6e2b86 LL |
4212 | static ssize_t __cifs_readv( |
4213 | struct kiocb *iocb, struct iov_iter *to, bool direct) | |
6685c5e2 | 4214 | { |
6685c5e2 | 4215 | size_t len; |
6e6e2b86 | 4216 | struct file *file = iocb->ki_filp; |
6685c5e2 | 4217 | struct cifs_sb_info *cifs_sb; |
6685c5e2 | 4218 | struct cifsFileInfo *cfile; |
6e6e2b86 LL |
4219 | struct cifs_tcon *tcon; |
4220 | ssize_t rc, total_read = 0; | |
4221 | loff_t offset = iocb->ki_pos; | |
6685c5e2 PS |
4222 | struct cifs_aio_ctx *ctx; |
4223 | ||
6e6e2b86 LL |
4224 | /* |
4225 | * iov_iter_get_pages_alloc() doesn't work with ITER_KVEC, | |
4226 | * fall back to data copy read path | |
4227 | * this could be improved by getting pages directly in ITER_KVEC | |
4228 | */ | |
6629400a | 4229 | if (direct && iov_iter_is_kvec(to)) { |
6e6e2b86 LL |
4230 | cifs_dbg(FYI, "use non-direct cifs_user_readv for kvec I/O\n"); |
4231 | direct = false; | |
4232 | } | |
4233 | ||
6685c5e2 PS |
4234 | len = iov_iter_count(to); |
4235 | if (!len) | |
4236 | return 0; | |
4237 | ||
4238 | cifs_sb = CIFS_FILE_SB(file); | |
4239 | cfile = file->private_data; | |
4240 | tcon = tlink_tcon(cfile->tlink); | |
4241 | ||
4242 | if (!tcon->ses->server->ops->async_readv) | |
4243 | return -ENOSYS; | |
4244 | ||
4245 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) | |
4246 | cifs_dbg(FYI, "attempting read on write only file instance\n"); | |
4247 | ||
4248 | ctx = cifs_aio_ctx_alloc(); | |
4249 | if (!ctx) | |
4250 | return -ENOMEM; | |
4251 | ||
4252 | ctx->cfile = cifsFileInfo_get(cfile); | |
4253 | ||
4254 | if (!is_sync_kiocb(iocb)) | |
4255 | ctx->iocb = iocb; | |
4256 | ||
fcb14cb1 | 4257 | if (user_backed_iter(to)) |
6685c5e2 PS |
4258 | ctx->should_dirty = true; |
4259 | ||
6e6e2b86 LL |
4260 | if (direct) { |
4261 | ctx->pos = offset; | |
4262 | ctx->direct_io = true; | |
4263 | ctx->iter = *to; | |
4264 | ctx->len = len; | |
4265 | } else { | |
4266 | rc = setup_aio_ctx_iter(ctx, to, READ); | |
4267 | if (rc) { | |
4268 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
4269 | return rc; | |
4270 | } | |
4271 | len = ctx->len; | |
6685c5e2 PS |
4272 | } |
4273 | ||
6685c5e2 PS |
4274 | /* grab a lock here due to read response handlers can access ctx */ |
4275 | mutex_lock(&ctx->aio_mutex); | |
4276 | ||
4277 | rc = cifs_send_async_read(offset, len, cfile, cifs_sb, &ctx->list, ctx); | |
4278 | ||
4279 | /* if at least one read request send succeeded, then reset rc */ | |
4280 | if (!list_empty(&ctx->list)) | |
4281 | rc = 0; | |
4282 | ||
4283 | mutex_unlock(&ctx->aio_mutex); | |
4284 | ||
4285 | if (rc) { | |
4286 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
4287 | return rc; | |
4288 | } | |
4289 | ||
4290 | if (!is_sync_kiocb(iocb)) { | |
4291 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
4292 | return -EIOCBQUEUED; | |
4293 | } | |
4294 | ||
4295 | rc = wait_for_completion_killable(&ctx->done); | |
4296 | if (rc) { | |
4297 | mutex_lock(&ctx->aio_mutex); | |
4298 | ctx->rc = rc = -EINTR; | |
4299 | total_read = ctx->total_len; | |
4300 | mutex_unlock(&ctx->aio_mutex); | |
4301 | } else { | |
4302 | rc = ctx->rc; | |
4303 | total_read = ctx->total_len; | |
4304 | } | |
4305 | ||
4306 | kref_put(&ctx->refcount, cifs_aio_ctx_release); | |
4307 | ||
0165e810 | 4308 | if (total_read) { |
e6a7bcb4 | 4309 | iocb->ki_pos += total_read; |
0165e810 AV |
4310 | return total_read; |
4311 | } | |
4312 | return rc; | |
a70307ee PS |
4313 | } |
4314 | ||
6e6e2b86 LL |
4315 | ssize_t cifs_direct_readv(struct kiocb *iocb, struct iov_iter *to) |
4316 | { | |
4317 | return __cifs_readv(iocb, to, true); | |
4318 | } | |
4319 | ||
4320 | ssize_t cifs_user_readv(struct kiocb *iocb, struct iov_iter *to) | |
4321 | { | |
4322 | return __cifs_readv(iocb, to, false); | |
4323 | } | |
4324 | ||
579f9053 | 4325 | ssize_t |
e6a7bcb4 | 4326 | cifs_strict_readv(struct kiocb *iocb, struct iov_iter *to) |
a70307ee | 4327 | { |
496ad9aa | 4328 | struct inode *inode = file_inode(iocb->ki_filp); |
579f9053 PS |
4329 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
4330 | struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); | |
4331 | struct cifsFileInfo *cfile = (struct cifsFileInfo *) | |
4332 | iocb->ki_filp->private_data; | |
4333 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); | |
4334 | int rc = -EACCES; | |
a70307ee PS |
4335 | |
4336 | /* | |
4337 | * In strict cache mode we need to read from the server all the time | |
4338 | * if we don't have level II oplock because the server can delay mtime | |
4339 | * change - so we can't make a decision about inode invalidating. | |
4340 | * And we can also fail with pagereading if there are mandatory locks | |
4341 | * on pages affected by this read but not on the region from pos to | |
4342 | * pos+len-1. | |
4343 | */ | |
18cceb6a | 4344 | if (!CIFS_CACHE_READ(cinode)) |
e6a7bcb4 | 4345 | return cifs_user_readv(iocb, to); |
a70307ee | 4346 | |
579f9053 PS |
4347 | if (cap_unix(tcon->ses) && |
4348 | (CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability)) && | |
4349 | ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0)) | |
e6a7bcb4 | 4350 | return generic_file_read_iter(iocb, to); |
579f9053 PS |
4351 | |
4352 | /* | |
4353 | * We need to hold the sem to be sure nobody modifies lock list | |
4354 | * with a brlock that prevents reading. | |
4355 | */ | |
4356 | down_read(&cinode->lock_sem); | |
e6a7bcb4 | 4357 | if (!cifs_find_lock_conflict(cfile, iocb->ki_pos, iov_iter_count(to), |
579f9053 | 4358 | tcon->ses->server->vals->shared_lock_type, |
9645759c | 4359 | 0, NULL, CIFS_READ_OP)) |
e6a7bcb4 | 4360 | rc = generic_file_read_iter(iocb, to); |
579f9053 PS |
4361 | up_read(&cinode->lock_sem); |
4362 | return rc; | |
a70307ee | 4363 | } |
1da177e4 | 4364 | |
f9c6e234 PS |
4365 | static ssize_t |
4366 | cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset) | |
1da177e4 LT |
4367 | { |
4368 | int rc = -EACCES; | |
4369 | unsigned int bytes_read = 0; | |
4370 | unsigned int total_read; | |
4371 | unsigned int current_read_size; | |
5eba8ab3 | 4372 | unsigned int rsize; |
1da177e4 | 4373 | struct cifs_sb_info *cifs_sb; |
29e20f9c | 4374 | struct cifs_tcon *tcon; |
f9c6e234 | 4375 | struct TCP_Server_Info *server; |
6d5786a3 | 4376 | unsigned int xid; |
f9c6e234 | 4377 | char *cur_offset; |
1da177e4 | 4378 | struct cifsFileInfo *open_file; |
7c06514a | 4379 | struct cifs_io_parms io_parms = {0}; |
ec637e3f | 4380 | int buf_type = CIFS_NO_BUFFER; |
d4ffff1f | 4381 | __u32 pid; |
1da177e4 | 4382 | |
6d5786a3 | 4383 | xid = get_xid(); |
7119e220 | 4384 | cifs_sb = CIFS_FILE_SB(file); |
1da177e4 | 4385 | |
5eba8ab3 | 4386 | /* FIXME: set up handlers for larger reads and/or convert to async */ |
522aa3b5 | 4387 | rsize = min_t(unsigned int, cifs_sb->ctx->rsize, CIFSMaxBufSize); |
5eba8ab3 | 4388 | |
1da177e4 | 4389 | if (file->private_data == NULL) { |
0f3bc09e | 4390 | rc = -EBADF; |
6d5786a3 | 4391 | free_xid(xid); |
0f3bc09e | 4392 | return rc; |
1da177e4 | 4393 | } |
c21dfb69 | 4394 | open_file = file->private_data; |
29e20f9c | 4395 | tcon = tlink_tcon(open_file->tlink); |
352d96f3 | 4396 | server = cifs_pick_channel(tcon->ses); |
f9c6e234 PS |
4397 | |
4398 | if (!server->ops->sync_read) { | |
4399 | free_xid(xid); | |
4400 | return -ENOSYS; | |
4401 | } | |
1da177e4 | 4402 | |
d4ffff1f PS |
4403 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
4404 | pid = open_file->pid; | |
4405 | else | |
4406 | pid = current->tgid; | |
4407 | ||
1da177e4 | 4408 | if ((file->f_flags & O_ACCMODE) == O_WRONLY) |
f96637be | 4409 | cifs_dbg(FYI, "attempting read on write only file instance\n"); |
1da177e4 | 4410 | |
f9c6e234 PS |
4411 | for (total_read = 0, cur_offset = read_data; read_size > total_read; |
4412 | total_read += bytes_read, cur_offset += bytes_read) { | |
e374d90f PS |
4413 | do { |
4414 | current_read_size = min_t(uint, read_size - total_read, | |
4415 | rsize); | |
4416 | /* | |
4417 | * For windows me and 9x we do not want to request more | |
4418 | * than it negotiated since it will refuse the read | |
4419 | * then. | |
4420 | */ | |
9bd21d4b | 4421 | if (!(tcon->ses->capabilities & |
29e20f9c | 4422 | tcon->ses->server->vals->cap_large_files)) { |
e374d90f PS |
4423 | current_read_size = min_t(uint, |
4424 | current_read_size, CIFSMaxBufSize); | |
4425 | } | |
cdff08e7 | 4426 | if (open_file->invalidHandle) { |
15886177 | 4427 | rc = cifs_reopen_file(open_file, true); |
1da177e4 LT |
4428 | if (rc != 0) |
4429 | break; | |
4430 | } | |
d4ffff1f | 4431 | io_parms.pid = pid; |
29e20f9c | 4432 | io_parms.tcon = tcon; |
f9c6e234 | 4433 | io_parms.offset = *offset; |
d4ffff1f | 4434 | io_parms.length = current_read_size; |
352d96f3 | 4435 | io_parms.server = server; |
db8b631d | 4436 | rc = server->ops->sync_read(xid, &open_file->fid, &io_parms, |
f9c6e234 PS |
4437 | &bytes_read, &cur_offset, |
4438 | &buf_type); | |
e374d90f PS |
4439 | } while (rc == -EAGAIN); |
4440 | ||
1da177e4 LT |
4441 | if (rc || (bytes_read == 0)) { |
4442 | if (total_read) { | |
4443 | break; | |
4444 | } else { | |
6d5786a3 | 4445 | free_xid(xid); |
1da177e4 LT |
4446 | return rc; |
4447 | } | |
4448 | } else { | |
29e20f9c | 4449 | cifs_stats_bytes_read(tcon, total_read); |
f9c6e234 | 4450 | *offset += bytes_read; |
1da177e4 LT |
4451 | } |
4452 | } | |
6d5786a3 | 4453 | free_xid(xid); |
1da177e4 LT |
4454 | return total_read; |
4455 | } | |
4456 | ||
ca83ce3d JL |
4457 | /* |
4458 | * If the page is mmap'ed into a process' page tables, then we need to make | |
4459 | * sure that it doesn't change while being written back. | |
4460 | */ | |
a5240cbd | 4461 | static vm_fault_t |
11bac800 | 4462 | cifs_page_mkwrite(struct vm_fault *vmf) |
ca83ce3d JL |
4463 | { |
4464 | struct page *page = vmf->page; | |
18d04062 | 4465 | |
70ef3851 DH |
4466 | /* Wait for the page to be written to the cache before we allow it to |
4467 | * be modified. We then assume the entire page will need writing back. | |
4468 | */ | |
70431bfd DH |
4469 | #ifdef CONFIG_CIFS_FSCACHE |
4470 | if (PageFsCache(page) && | |
4471 | wait_on_page_fscache_killable(page) < 0) | |
4472 | return VM_FAULT_RETRY; | |
4473 | #endif | |
ca83ce3d | 4474 | |
70ef3851 DH |
4475 | wait_on_page_writeback(page); |
4476 | ||
4477 | if (lock_page_killable(page) < 0) | |
4478 | return VM_FAULT_RETRY; | |
ca83ce3d JL |
4479 | return VM_FAULT_LOCKED; |
4480 | } | |
4481 | ||
7cbea8dc | 4482 | static const struct vm_operations_struct cifs_file_vm_ops = { |
ca83ce3d | 4483 | .fault = filemap_fault, |
f1820361 | 4484 | .map_pages = filemap_map_pages, |
ca83ce3d JL |
4485 | .page_mkwrite = cifs_page_mkwrite, |
4486 | }; | |
4487 | ||
7a6a19b1 PS |
4488 | int cifs_file_strict_mmap(struct file *file, struct vm_area_struct *vma) |
4489 | { | |
f04a703c | 4490 | int xid, rc = 0; |
496ad9aa | 4491 | struct inode *inode = file_inode(file); |
7a6a19b1 | 4492 | |
6d5786a3 | 4493 | xid = get_xid(); |
7a6a19b1 | 4494 | |
f04a703c | 4495 | if (!CIFS_CACHE_READ(CIFS_I(inode))) |
4f73c7d3 | 4496 | rc = cifs_zap_mapping(inode); |
f04a703c MW |
4497 | if (!rc) |
4498 | rc = generic_file_mmap(file, vma); | |
4499 | if (!rc) | |
ca83ce3d | 4500 | vma->vm_ops = &cifs_file_vm_ops; |
f04a703c | 4501 | |
6d5786a3 | 4502 | free_xid(xid); |
7a6a19b1 PS |
4503 | return rc; |
4504 | } | |
4505 | ||
1da177e4 LT |
4506 | int cifs_file_mmap(struct file *file, struct vm_area_struct *vma) |
4507 | { | |
1da177e4 LT |
4508 | int rc, xid; |
4509 | ||
6d5786a3 | 4510 | xid = get_xid(); |
f04a703c | 4511 | |
abab095d | 4512 | rc = cifs_revalidate_file(file); |
f04a703c | 4513 | if (rc) |
f96637be JP |
4514 | cifs_dbg(FYI, "Validation prior to mmap failed, error=%d\n", |
4515 | rc); | |
f04a703c MW |
4516 | if (!rc) |
4517 | rc = generic_file_mmap(file, vma); | |
4518 | if (!rc) | |
ca83ce3d | 4519 | vma->vm_ops = &cifs_file_vm_ops; |
f04a703c | 4520 | |
6d5786a3 | 4521 | free_xid(xid); |
1da177e4 LT |
4522 | return rc; |
4523 | } | |
4524 | ||
0471ca3f JL |
4525 | static void |
4526 | cifs_readv_complete(struct work_struct *work) | |
4527 | { | |
b770ddfa | 4528 | unsigned int i, got_bytes; |
0471ca3f JL |
4529 | struct cifs_readdata *rdata = container_of(work, |
4530 | struct cifs_readdata, work); | |
0471ca3f | 4531 | |
b770ddfa | 4532 | got_bytes = rdata->got_bytes; |
c5fab6f4 JL |
4533 | for (i = 0; i < rdata->nr_pages; i++) { |
4534 | struct page *page = rdata->pages[i]; | |
4535 | ||
b770ddfa PS |
4536 | if (rdata->result == 0 || |
4537 | (rdata->result == -EAGAIN && got_bytes)) { | |
0471ca3f JL |
4538 | flush_dcache_page(page); |
4539 | SetPageUptodate(page); | |
18d04062 SP |
4540 | } else |
4541 | SetPageError(page); | |
0471ca3f | 4542 | |
b770ddfa PS |
4543 | if (rdata->result == 0 || |
4544 | (rdata->result == -EAGAIN && got_bytes)) | |
0471ca3f JL |
4545 | cifs_readpage_to_fscache(rdata->mapping->host, page); |
4546 | ||
0174ee99 DH |
4547 | unlock_page(page); |
4548 | ||
09cbfeaf | 4549 | got_bytes -= min_t(unsigned int, PAGE_SIZE, got_bytes); |
b770ddfa | 4550 | |
09cbfeaf | 4551 | put_page(page); |
c5fab6f4 | 4552 | rdata->pages[i] = NULL; |
0471ca3f | 4553 | } |
6993f74a | 4554 | kref_put(&rdata->refcount, cifs_readdata_release); |
0471ca3f JL |
4555 | } |
4556 | ||
8d5ce4d2 | 4557 | static int |
d70b9104 PS |
4558 | readpages_fill_pages(struct TCP_Server_Info *server, |
4559 | struct cifs_readdata *rdata, struct iov_iter *iter, | |
4560 | unsigned int len) | |
8d5ce4d2 | 4561 | { |
b3160aeb | 4562 | int result = 0; |
c5fab6f4 | 4563 | unsigned int i; |
8d5ce4d2 JL |
4564 | u64 eof; |
4565 | pgoff_t eof_index; | |
c5fab6f4 | 4566 | unsigned int nr_pages = rdata->nr_pages; |
1dbe3466 | 4567 | unsigned int page_offset = rdata->page_offset; |
8d5ce4d2 JL |
4568 | |
4569 | /* determine the eof that the server (probably) has */ | |
4570 | eof = CIFS_I(rdata->mapping->host)->server_eof; | |
09cbfeaf | 4571 | eof_index = eof ? (eof - 1) >> PAGE_SHIFT : 0; |
f96637be | 4572 | cifs_dbg(FYI, "eof=%llu eof_index=%lu\n", eof, eof_index); |
8d5ce4d2 | 4573 | |
b3160aeb | 4574 | rdata->got_bytes = 0; |
09cbfeaf | 4575 | rdata->tailsz = PAGE_SIZE; |
c5fab6f4 JL |
4576 | for (i = 0; i < nr_pages; i++) { |
4577 | struct page *page = rdata->pages[i]; | |
1dbe3466 LL |
4578 | unsigned int to_read = rdata->pagesz; |
4579 | size_t n; | |
4580 | ||
4581 | if (i == 0) | |
4582 | to_read -= page_offset; | |
4583 | else | |
4584 | page_offset = 0; | |
4585 | ||
4586 | n = to_read; | |
c5fab6f4 | 4587 | |
1dbe3466 LL |
4588 | if (len >= to_read) { |
4589 | len -= to_read; | |
8321fec4 | 4590 | } else if (len > 0) { |
8d5ce4d2 | 4591 | /* enough for partial page, fill and zero the rest */ |
1dbe3466 | 4592 | zero_user(page, len + page_offset, to_read - len); |
71335664 | 4593 | n = rdata->tailsz = len; |
8321fec4 | 4594 | len = 0; |
8d5ce4d2 JL |
4595 | } else if (page->index > eof_index) { |
4596 | /* | |
4597 | * The VFS will not try to do readahead past the | |
4598 | * i_size, but it's possible that we have outstanding | |
4599 | * writes with gaps in the middle and the i_size hasn't | |
4600 | * caught up yet. Populate those with zeroed out pages | |
4601 | * to prevent the VFS from repeatedly attempting to | |
4602 | * fill them until the writes are flushed. | |
4603 | */ | |
09cbfeaf | 4604 | zero_user(page, 0, PAGE_SIZE); |
8d5ce4d2 JL |
4605 | flush_dcache_page(page); |
4606 | SetPageUptodate(page); | |
4607 | unlock_page(page); | |
09cbfeaf | 4608 | put_page(page); |
c5fab6f4 JL |
4609 | rdata->pages[i] = NULL; |
4610 | rdata->nr_pages--; | |
8321fec4 | 4611 | continue; |
8d5ce4d2 JL |
4612 | } else { |
4613 | /* no need to hold page hostage */ | |
8d5ce4d2 | 4614 | unlock_page(page); |
09cbfeaf | 4615 | put_page(page); |
c5fab6f4 JL |
4616 | rdata->pages[i] = NULL; |
4617 | rdata->nr_pages--; | |
8321fec4 | 4618 | continue; |
8d5ce4d2 | 4619 | } |
8321fec4 | 4620 | |
d70b9104 | 4621 | if (iter) |
1dbe3466 LL |
4622 | result = copy_page_from_iter( |
4623 | page, page_offset, n, iter); | |
bd3dcc6a LL |
4624 | #ifdef CONFIG_CIFS_SMB_DIRECT |
4625 | else if (rdata->mr) | |
4626 | result = n; | |
4627 | #endif | |
d70b9104 | 4628 | else |
1dbe3466 LL |
4629 | result = cifs_read_page_from_socket( |
4630 | server, page, page_offset, n); | |
8321fec4 JL |
4631 | if (result < 0) |
4632 | break; | |
4633 | ||
b3160aeb | 4634 | rdata->got_bytes += result; |
8d5ce4d2 JL |
4635 | } |
4636 | ||
b3160aeb PS |
4637 | return rdata->got_bytes > 0 && result != -ECONNABORTED ? |
4638 | rdata->got_bytes : result; | |
8d5ce4d2 JL |
4639 | } |
4640 | ||
d70b9104 PS |
4641 | static int |
4642 | cifs_readpages_read_into_pages(struct TCP_Server_Info *server, | |
4643 | struct cifs_readdata *rdata, unsigned int len) | |
4644 | { | |
4645 | return readpages_fill_pages(server, rdata, NULL, len); | |
4646 | } | |
4647 | ||
4648 | static int | |
4649 | cifs_readpages_copy_into_pages(struct TCP_Server_Info *server, | |
4650 | struct cifs_readdata *rdata, | |
4651 | struct iov_iter *iter) | |
4652 | { | |
4653 | return readpages_fill_pages(server, rdata, iter, iter->count); | |
4654 | } | |
4655 | ||
052e04a5 | 4656 | static void cifs_readahead(struct readahead_control *ractl) |
387eb92a | 4657 | { |
387eb92a | 4658 | int rc; |
052e04a5 DH |
4659 | struct cifsFileInfo *open_file = ractl->file->private_data; |
4660 | struct cifs_sb_info *cifs_sb = CIFS_FILE_SB(ractl->file); | |
69cebd75 | 4661 | struct TCP_Server_Info *server; |
690c5e31 | 4662 | pid_t pid; |
0174ee99 DH |
4663 | unsigned int xid, nr_pages, last_batch_size = 0, cache_nr_pages = 0; |
4664 | pgoff_t next_cached = ULONG_MAX; | |
4665 | bool caching = fscache_cookie_enabled(cifs_inode_cookie(ractl->mapping->host)) && | |
4666 | cifs_inode_cookie(ractl->mapping->host)->cache_priv; | |
4667 | bool check_cache = caching; | |
1da177e4 | 4668 | |
0cb012d1 | 4669 | xid = get_xid(); |
56698236 | 4670 | |
d4ffff1f PS |
4671 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RWPIDFORWARD) |
4672 | pid = open_file->pid; | |
4673 | else | |
4674 | pid = current->tgid; | |
4675 | ||
690c5e31 | 4676 | rc = 0; |
352d96f3 | 4677 | server = cifs_pick_channel(tlink_tcon(open_file->tlink)->ses); |
1da177e4 | 4678 | |
f96637be | 4679 | cifs_dbg(FYI, "%s: file=%p mapping=%p num_pages=%u\n", |
052e04a5 | 4680 | __func__, ractl->file, ractl->mapping, readahead_count(ractl)); |
690c5e31 JL |
4681 | |
4682 | /* | |
052e04a5 | 4683 | * Chop the readahead request up into rsize-sized read requests. |
690c5e31 | 4684 | */ |
0174ee99 DH |
4685 | while ((nr_pages = readahead_count(ractl) - last_batch_size)) { |
4686 | unsigned int i, got, rsize; | |
052e04a5 | 4687 | struct page *page; |
690c5e31 | 4688 | struct cifs_readdata *rdata; |
335b7b62 PS |
4689 | struct cifs_credits credits_on_stack; |
4690 | struct cifs_credits *credits = &credits_on_stack; | |
0174ee99 DH |
4691 | pgoff_t index = readahead_index(ractl) + last_batch_size; |
4692 | ||
4693 | /* | |
4694 | * Find out if we have anything cached in the range of | |
4695 | * interest, and if so, where the next chunk of cached data is. | |
4696 | */ | |
4697 | if (caching) { | |
4698 | if (check_cache) { | |
4699 | rc = cifs_fscache_query_occupancy( | |
4700 | ractl->mapping->host, index, nr_pages, | |
4701 | &next_cached, &cache_nr_pages); | |
4702 | if (rc < 0) | |
4703 | caching = false; | |
4704 | check_cache = false; | |
4705 | } | |
4706 | ||
4707 | if (index == next_cached) { | |
4708 | /* | |
4709 | * TODO: Send a whole batch of pages to be read | |
4710 | * by the cache. | |
4711 | */ | |
c6f62f81 | 4712 | struct folio *folio = readahead_folio(ractl); |
97b82c07 | 4713 | |
c6f62f81 | 4714 | last_batch_size = folio_nr_pages(folio); |
0174ee99 | 4715 | if (cifs_readpage_from_fscache(ractl->mapping->host, |
c6f62f81 | 4716 | &folio->page) < 0) { |
0174ee99 DH |
4717 | /* |
4718 | * TODO: Deal with cache read failure | |
4719 | * here, but for the moment, delegate | |
4720 | * that to readpage. | |
4721 | */ | |
4722 | caching = false; | |
4723 | } | |
c6f62f81 | 4724 | folio_unlock(folio); |
0174ee99 DH |
4725 | next_cached++; |
4726 | cache_nr_pages--; | |
4727 | if (cache_nr_pages == 0) | |
4728 | check_cache = true; | |
4729 | continue; | |
4730 | } | |
4731 | } | |
1da177e4 | 4732 | |
3e952994 PS |
4733 | if (open_file->invalidHandle) { |
4734 | rc = cifs_reopen_file(open_file, true); | |
052e04a5 DH |
4735 | if (rc) { |
4736 | if (rc == -EAGAIN) | |
4737 | continue; | |
3e952994 | 4738 | break; |
052e04a5 | 4739 | } |
3e952994 PS |
4740 | } |
4741 | ||
06a46656 RS |
4742 | if (cifs_sb->ctx->rsize == 0) |
4743 | cifs_sb->ctx->rsize = | |
4744 | server->ops->negotiate_rsize(tlink_tcon(open_file->tlink), | |
4745 | cifs_sb->ctx); | |
4746 | ||
522aa3b5 | 4747 | rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize, |
335b7b62 | 4748 | &rsize, credits); |
bed9da02 PS |
4749 | if (rc) |
4750 | break; | |
052e04a5 | 4751 | nr_pages = min_t(size_t, rsize / PAGE_SIZE, readahead_count(ractl)); |
0174ee99 | 4752 | nr_pages = min_t(size_t, nr_pages, next_cached - index); |
690c5e31 JL |
4753 | |
4754 | /* | |
69cebd75 PS |
4755 | * Give up immediately if rsize is too small to read an entire |
4756 | * page. The VFS will fall back to readpage. We should never | |
4757 | * reach this point however since we set ra_pages to 0 when the | |
4758 | * rsize is smaller than a cache page. | |
690c5e31 | 4759 | */ |
052e04a5 | 4760 | if (unlikely(!nr_pages)) { |
bed9da02 | 4761 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
4762 | break; |
4763 | } | |
4764 | ||
0471ca3f | 4765 | rdata = cifs_readdata_alloc(nr_pages, cifs_readv_complete); |
690c5e31 JL |
4766 | if (!rdata) { |
4767 | /* best to give up if we're out of mem */ | |
bed9da02 | 4768 | add_credits_and_wake_if(server, credits, 0); |
690c5e31 JL |
4769 | break; |
4770 | } | |
4771 | ||
052e04a5 DH |
4772 | got = __readahead_batch(ractl, rdata->pages, nr_pages); |
4773 | if (got != nr_pages) { | |
4774 | pr_warn("__readahead_batch() returned %u/%u\n", | |
4775 | got, nr_pages); | |
4776 | nr_pages = got; | |
4777 | } | |
4778 | ||
4779 | rdata->nr_pages = nr_pages; | |
4780 | rdata->bytes = readahead_batch_length(ractl); | |
4781 | rdata->cfile = cifsFileInfo_get(open_file); | |
4782 | rdata->server = server; | |
4783 | rdata->mapping = ractl->mapping; | |
4784 | rdata->offset = readahead_pos(ractl); | |
4785 | rdata->pid = pid; | |
4786 | rdata->pagesz = PAGE_SIZE; | |
4787 | rdata->tailsz = PAGE_SIZE; | |
8321fec4 | 4788 | rdata->read_into_pages = cifs_readpages_read_into_pages; |
d70b9104 | 4789 | rdata->copy_into_pages = cifs_readpages_copy_into_pages; |
052e04a5 | 4790 | rdata->credits = credits_on_stack; |
690c5e31 | 4791 | |
9a1c67e8 | 4792 | rc = adjust_credits(server, &rdata->credits, rdata->bytes); |
9a1c67e8 PS |
4793 | if (!rc) { |
4794 | if (rdata->cfile->invalidHandle) | |
3e952994 PS |
4795 | rc = -EAGAIN; |
4796 | else | |
9a1c67e8 PS |
4797 | rc = server->ops->async_readv(rdata); |
4798 | } | |
4799 | ||
69cebd75 | 4800 | if (rc) { |
335b7b62 | 4801 | add_credits_and_wake_if(server, &rdata->credits, 0); |
c5fab6f4 JL |
4802 | for (i = 0; i < rdata->nr_pages; i++) { |
4803 | page = rdata->pages[i]; | |
690c5e31 | 4804 | unlock_page(page); |
09cbfeaf | 4805 | put_page(page); |
1da177e4 | 4806 | } |
1209bbdf | 4807 | /* Fallback to the readpage in error/reconnect cases */ |
6993f74a | 4808 | kref_put(&rdata->refcount, cifs_readdata_release); |
1da177e4 LT |
4809 | break; |
4810 | } | |
6993f74a JL |
4811 | |
4812 | kref_put(&rdata->refcount, cifs_readdata_release); | |
052e04a5 | 4813 | last_batch_size = nr_pages; |
1da177e4 LT |
4814 | } |
4815 | ||
0cb012d1 | 4816 | free_xid(xid); |
1da177e4 LT |
4817 | } |
4818 | ||
a9e9b7bc SP |
4819 | /* |
4820 | * cifs_readpage_worker must be called with the page pinned | |
4821 | */ | |
1da177e4 LT |
4822 | static int cifs_readpage_worker(struct file *file, struct page *page, |
4823 | loff_t *poffset) | |
4824 | { | |
4825 | char *read_data; | |
4826 | int rc; | |
4827 | ||
56698236 | 4828 | /* Is the page cached? */ |
496ad9aa | 4829 | rc = cifs_readpage_from_fscache(file_inode(file), page); |
56698236 SJ |
4830 | if (rc == 0) |
4831 | goto read_complete; | |
4832 | ||
1da177e4 LT |
4833 | read_data = kmap(page); |
4834 | /* for reads over a certain size could initiate async read ahead */ | |
fb8c4b14 | 4835 | |
09cbfeaf | 4836 | rc = cifs_read(file, read_data, PAGE_SIZE, poffset); |
fb8c4b14 | 4837 | |
1da177e4 LT |
4838 | if (rc < 0) |
4839 | goto io_error; | |
4840 | else | |
f96637be | 4841 | cifs_dbg(FYI, "Bytes read %d\n", rc); |
fb8c4b14 | 4842 | |
9b9c5bea SF |
4843 | /* we do not want atime to be less than mtime, it broke some apps */ |
4844 | file_inode(file)->i_atime = current_time(file_inode(file)); | |
4845 | if (timespec64_compare(&(file_inode(file)->i_atime), &(file_inode(file)->i_mtime))) | |
4846 | file_inode(file)->i_atime = file_inode(file)->i_mtime; | |
4847 | else | |
4848 | file_inode(file)->i_atime = current_time(file_inode(file)); | |
fb8c4b14 | 4849 | |
09cbfeaf KS |
4850 | if (PAGE_SIZE > rc) |
4851 | memset(read_data + rc, 0, PAGE_SIZE - rc); | |
1da177e4 LT |
4852 | |
4853 | flush_dcache_page(page); | |
4854 | SetPageUptodate(page); | |
9dc06558 SJ |
4855 | |
4856 | /* send this page to the cache */ | |
496ad9aa | 4857 | cifs_readpage_to_fscache(file_inode(file), page); |
9dc06558 | 4858 | |
1da177e4 | 4859 | rc = 0; |
fb8c4b14 | 4860 | |
1da177e4 | 4861 | io_error: |
fb8c4b14 | 4862 | kunmap(page); |
466bd31b | 4863 | unlock_page(page); |
56698236 SJ |
4864 | |
4865 | read_complete: | |
1da177e4 LT |
4866 | return rc; |
4867 | } | |
4868 | ||
ce3bb0d2 | 4869 | static int cifs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 4870 | { |
ce3bb0d2 | 4871 | struct page *page = &folio->page; |
f2a26a3c | 4872 | loff_t offset = page_file_offset(page); |
1da177e4 | 4873 | int rc = -EACCES; |
6d5786a3 | 4874 | unsigned int xid; |
1da177e4 | 4875 | |
6d5786a3 | 4876 | xid = get_xid(); |
1da177e4 LT |
4877 | |
4878 | if (file->private_data == NULL) { | |
0f3bc09e | 4879 | rc = -EBADF; |
6d5786a3 | 4880 | free_xid(xid); |
0f3bc09e | 4881 | return rc; |
1da177e4 LT |
4882 | } |
4883 | ||
ce3bb0d2 | 4884 | cifs_dbg(FYI, "read_folio %p at offset %d 0x%x\n", |
b6b38f70 | 4885 | page, (int)offset, (int)offset); |
1da177e4 LT |
4886 | |
4887 | rc = cifs_readpage_worker(file, page, &offset); | |
4888 | ||
6d5786a3 | 4889 | free_xid(xid); |
1da177e4 LT |
4890 | return rc; |
4891 | } | |
4892 | ||
a403a0a3 SF |
4893 | static int is_inode_writable(struct cifsInodeInfo *cifs_inode) |
4894 | { | |
4895 | struct cifsFileInfo *open_file; | |
4896 | ||
cb248819 | 4897 | spin_lock(&cifs_inode->open_file_lock); |
a403a0a3 | 4898 | list_for_each_entry(open_file, &cifs_inode->openFileList, flist) { |
2e396b83 | 4899 | if (OPEN_FMODE(open_file->f_flags) & FMODE_WRITE) { |
cb248819 | 4900 | spin_unlock(&cifs_inode->open_file_lock); |
a403a0a3 SF |
4901 | return 1; |
4902 | } | |
4903 | } | |
cb248819 | 4904 | spin_unlock(&cifs_inode->open_file_lock); |
a403a0a3 SF |
4905 | return 0; |
4906 | } | |
4907 | ||
1da177e4 LT |
4908 | /* We do not want to update the file size from server for inodes |
4909 | open for write - to avoid races with writepage extending | |
4910 | the file - in the future we could consider allowing | |
fb8c4b14 | 4911 | refreshing the inode only on increases in the file size |
1da177e4 LT |
4912 | but this is tricky to do without racing with writebehind |
4913 | page caching in the current Linux kernel design */ | |
4b18f2a9 | 4914 | bool is_size_safe_to_change(struct cifsInodeInfo *cifsInode, __u64 end_of_file) |
1da177e4 | 4915 | { |
a403a0a3 | 4916 | if (!cifsInode) |
4b18f2a9 | 4917 | return true; |
50c2f753 | 4918 | |
a403a0a3 SF |
4919 | if (is_inode_writable(cifsInode)) { |
4920 | /* This inode is open for write at least once */ | |
c32a0b68 SF |
4921 | struct cifs_sb_info *cifs_sb; |
4922 | ||
874c8ca1 | 4923 | cifs_sb = CIFS_SB(cifsInode->netfs.inode.i_sb); |
ad7a2926 | 4924 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_DIRECT_IO) { |
fb8c4b14 | 4925 | /* since no page cache to corrupt on directio |
c32a0b68 | 4926 | we can change size safely */ |
4b18f2a9 | 4927 | return true; |
c32a0b68 SF |
4928 | } |
4929 | ||
874c8ca1 | 4930 | if (i_size_read(&cifsInode->netfs.inode) < end_of_file) |
4b18f2a9 | 4931 | return true; |
7ba52631 | 4932 | |
4b18f2a9 | 4933 | return false; |
23e7dd7d | 4934 | } else |
4b18f2a9 | 4935 | return true; |
1da177e4 LT |
4936 | } |
4937 | ||
d9414774 | 4938 | static int cifs_write_begin(struct file *file, struct address_space *mapping, |
9d6b0cd7 | 4939 | loff_t pos, unsigned len, |
d9414774 | 4940 | struct page **pagep, void **fsdata) |
1da177e4 | 4941 | { |
466bd31b | 4942 | int oncethru = 0; |
09cbfeaf KS |
4943 | pgoff_t index = pos >> PAGE_SHIFT; |
4944 | loff_t offset = pos & (PAGE_SIZE - 1); | |
a98ee8c1 JL |
4945 | loff_t page_start = pos & PAGE_MASK; |
4946 | loff_t i_size; | |
4947 | struct page *page; | |
4948 | int rc = 0; | |
d9414774 | 4949 | |
f96637be | 4950 | cifs_dbg(FYI, "write_begin from %lld len %d\n", (long long)pos, len); |
d9414774 | 4951 | |
466bd31b | 4952 | start: |
b7446e7c | 4953 | page = grab_cache_page_write_begin(mapping, index); |
a98ee8c1 JL |
4954 | if (!page) { |
4955 | rc = -ENOMEM; | |
4956 | goto out; | |
4957 | } | |
8a236264 | 4958 | |
a98ee8c1 JL |
4959 | if (PageUptodate(page)) |
4960 | goto out; | |
8a236264 | 4961 | |
a98ee8c1 JL |
4962 | /* |
4963 | * If we write a full page it will be up to date, no need to read from | |
4964 | * the server. If the write is short, we'll end up doing a sync write | |
4965 | * instead. | |
4966 | */ | |
09cbfeaf | 4967 | if (len == PAGE_SIZE) |
a98ee8c1 | 4968 | goto out; |
8a236264 | 4969 | |
a98ee8c1 JL |
4970 | /* |
4971 | * optimize away the read when we have an oplock, and we're not | |
4972 | * expecting to use any of the data we'd be reading in. That | |
4973 | * is, when the page lies beyond the EOF, or straddles the EOF | |
4974 | * and the write will cover all of the existing data. | |
4975 | */ | |
18cceb6a | 4976 | if (CIFS_CACHE_READ(CIFS_I(mapping->host))) { |
a98ee8c1 JL |
4977 | i_size = i_size_read(mapping->host); |
4978 | if (page_start >= i_size || | |
4979 | (offset == 0 && (pos + len) >= i_size)) { | |
4980 | zero_user_segments(page, 0, offset, | |
4981 | offset + len, | |
09cbfeaf | 4982 | PAGE_SIZE); |
a98ee8c1 JL |
4983 | /* |
4984 | * PageChecked means that the parts of the page | |
4985 | * to which we're not writing are considered up | |
4986 | * to date. Once the data is copied to the | |
4987 | * page, it can be set uptodate. | |
4988 | */ | |
4989 | SetPageChecked(page); | |
4990 | goto out; | |
4991 | } | |
4992 | } | |
d9414774 | 4993 | |
466bd31b | 4994 | if ((file->f_flags & O_ACCMODE) != O_WRONLY && !oncethru) { |
a98ee8c1 JL |
4995 | /* |
4996 | * might as well read a page, it is fast enough. If we get | |
4997 | * an error, we don't need to return it. cifs_write_end will | |
4998 | * do a sync write instead since PG_uptodate isn't set. | |
4999 | */ | |
5000 | cifs_readpage_worker(file, page, &page_start); | |
09cbfeaf | 5001 | put_page(page); |
466bd31b SP |
5002 | oncethru = 1; |
5003 | goto start; | |
8a236264 SF |
5004 | } else { |
5005 | /* we could try using another file handle if there is one - | |
5006 | but how would we lock it to prevent close of that handle | |
5007 | racing with this read? In any case | |
d9414774 | 5008 | this will be written out by write_end so is fine */ |
1da177e4 | 5009 | } |
a98ee8c1 JL |
5010 | out: |
5011 | *pagep = page; | |
5012 | return rc; | |
1da177e4 LT |
5013 | } |
5014 | ||
eef15ea1 | 5015 | static bool cifs_release_folio(struct folio *folio, gfp_t gfp) |
85f2d6b4 | 5016 | { |
eef15ea1 | 5017 | if (folio_test_private(folio)) |
85f2d6b4 | 5018 | return 0; |
eef15ea1 | 5019 | if (folio_test_fscache(folio)) { |
70431bfd DH |
5020 | if (current_is_kswapd() || !(gfp & __GFP_FS)) |
5021 | return false; | |
eef15ea1 | 5022 | folio_wait_fscache(folio); |
70431bfd | 5023 | } |
eef15ea1 | 5024 | fscache_note_page_release(cifs_inode_cookie(folio->mapping->host)); |
70431bfd | 5025 | return true; |
85f2d6b4 SJ |
5026 | } |
5027 | ||
0eaf6052 MWO |
5028 | static void cifs_invalidate_folio(struct folio *folio, size_t offset, |
5029 | size_t length) | |
85f2d6b4 | 5030 | { |
0eaf6052 | 5031 | folio_wait_fscache(folio); |
85f2d6b4 SJ |
5032 | } |
5033 | ||
ff2b48b9 | 5034 | static int cifs_launder_folio(struct folio *folio) |
9ad1506b PS |
5035 | { |
5036 | int rc = 0; | |
ff2b48b9 MWO |
5037 | loff_t range_start = folio_pos(folio); |
5038 | loff_t range_end = range_start + folio_size(folio); | |
9ad1506b PS |
5039 | struct writeback_control wbc = { |
5040 | .sync_mode = WB_SYNC_ALL, | |
5041 | .nr_to_write = 0, | |
5042 | .range_start = range_start, | |
5043 | .range_end = range_end, | |
5044 | }; | |
5045 | ||
ff2b48b9 | 5046 | cifs_dbg(FYI, "Launder page: %lu\n", folio->index); |
9ad1506b | 5047 | |
ff2b48b9 MWO |
5048 | if (folio_clear_dirty_for_io(folio)) |
5049 | rc = cifs_writepage_locked(&folio->page, &wbc); | |
9ad1506b | 5050 | |
ff2b48b9 | 5051 | folio_wait_fscache(folio); |
9ad1506b PS |
5052 | return rc; |
5053 | } | |
5054 | ||
9b646972 | 5055 | void cifs_oplock_break(struct work_struct *work) |
3bc303c2 JL |
5056 | { |
5057 | struct cifsFileInfo *cfile = container_of(work, struct cifsFileInfo, | |
5058 | oplock_break); | |
2b0143b5 | 5059 | struct inode *inode = d_inode(cfile->dentry); |
3bc303c2 | 5060 | struct cifsInodeInfo *cinode = CIFS_I(inode); |
95a3f2f3 | 5061 | struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); |
c11f1df5 | 5062 | struct TCP_Server_Info *server = tcon->ses->server; |
eb4b756b | 5063 | int rc = 0; |
9bd45408 | 5064 | bool purge_cache = false; |
3bc303c2 | 5065 | |
c11f1df5 | 5066 | wait_on_bit(&cinode->flags, CIFS_INODE_PENDING_WRITERS, |
74316201 | 5067 | TASK_UNINTERRUPTIBLE); |
c11f1df5 | 5068 | |
9bd45408 PS |
5069 | server->ops->downgrade_oplock(server, cinode, cfile->oplock_level, |
5070 | cfile->oplock_epoch, &purge_cache); | |
c11f1df5 | 5071 | |
18cceb6a | 5072 | if (!CIFS_CACHE_WRITE(cinode) && CIFS_CACHE_READ(cinode) && |
63b7d3a4 | 5073 | cifs_has_mand_locks(cinode)) { |
f96637be JP |
5074 | cifs_dbg(FYI, "Reset oplock to None for inode=%p due to mand locks\n", |
5075 | inode); | |
18cceb6a | 5076 | cinode->oplock = 0; |
63b7d3a4 PS |
5077 | } |
5078 | ||
3bc303c2 | 5079 | if (inode && S_ISREG(inode->i_mode)) { |
18cceb6a | 5080 | if (CIFS_CACHE_READ(cinode)) |
8737c930 | 5081 | break_lease(inode, O_RDONLY); |
d54ff732 | 5082 | else |
8737c930 | 5083 | break_lease(inode, O_WRONLY); |
3bc303c2 | 5084 | rc = filemap_fdatawrite(inode->i_mapping); |
9bd45408 | 5085 | if (!CIFS_CACHE_READ(cinode) || purge_cache) { |
eb4b756b JL |
5086 | rc = filemap_fdatawait(inode->i_mapping); |
5087 | mapping_set_error(inode->i_mapping, rc); | |
4f73c7d3 | 5088 | cifs_zap_mapping(inode); |
3bc303c2 | 5089 | } |
f96637be | 5090 | cifs_dbg(FYI, "Oplock flush inode %p rc %d\n", inode, rc); |
9bd45408 PS |
5091 | if (CIFS_CACHE_WRITE(cinode)) |
5092 | goto oplock_break_ack; | |
3bc303c2 JL |
5093 | } |
5094 | ||
85160e03 PS |
5095 | rc = cifs_push_locks(cfile); |
5096 | if (rc) | |
f96637be | 5097 | cifs_dbg(VFS, "Push locks rc = %d\n", rc); |
85160e03 | 5098 | |
9bd45408 | 5099 | oplock_break_ack: |
9e992755 RS |
5100 | /* |
5101 | * releasing stale oplock after recent reconnect of smb session using | |
5102 | * a now incorrect file handle is not a data integrity issue but do | |
5103 | * not bother sending an oplock release if session to server still is | |
5104 | * disconnected since oplock already released by the server | |
5105 | */ | |
5106 | if (!cfile->oplock_break_cancelled) { | |
5107 | rc = tcon->ses->server->ops->oplock_response(tcon, &cfile->fid, | |
5108 | cinode); | |
5109 | cifs_dbg(FYI, "Oplock release rc = %d\n", rc); | |
5110 | } | |
9e31678f | 5111 | |
32546a95 | 5112 | _cifsFileInfo_put(cfile, false /* do not wait for ourself */, false); |
c11f1df5 | 5113 | cifs_done_oplock_break(cinode); |
3bc303c2 JL |
5114 | } |
5115 | ||
dca69288 SF |
5116 | /* |
5117 | * The presence of cifs_direct_io() in the address space ops vector | |
5118 | * allowes open() O_DIRECT flags which would have failed otherwise. | |
5119 | * | |
5120 | * In the non-cached mode (mount with cache=none), we shunt off direct read and write requests | |
5121 | * so this method should never be called. | |
5122 | * | |
052e04a5 | 5123 | * Direct IO is not yet supported in the cached mode. |
dca69288 SF |
5124 | */ |
5125 | static ssize_t | |
c8b8e32d | 5126 | cifs_direct_io(struct kiocb *iocb, struct iov_iter *iter) |
dca69288 SF |
5127 | { |
5128 | /* | |
5129 | * FIXME | |
5130 | * Eventually need to support direct IO for non forcedirectio mounts | |
5131 | */ | |
5132 | return -EINVAL; | |
5133 | } | |
5134 | ||
4e8aea30 SF |
5135 | static int cifs_swap_activate(struct swap_info_struct *sis, |
5136 | struct file *swap_file, sector_t *span) | |
5137 | { | |
5138 | struct cifsFileInfo *cfile = swap_file->private_data; | |
5139 | struct inode *inode = swap_file->f_mapping->host; | |
5140 | unsigned long blocks; | |
5141 | long long isize; | |
5142 | ||
5143 | cifs_dbg(FYI, "swap activate\n"); | |
5144 | ||
e1209d3a N |
5145 | if (!swap_file->f_mapping->a_ops->swap_rw) |
5146 | /* Cannot support swap */ | |
5147 | return -EINVAL; | |
5148 | ||
4e8aea30 SF |
5149 | spin_lock(&inode->i_lock); |
5150 | blocks = inode->i_blocks; | |
5151 | isize = inode->i_size; | |
5152 | spin_unlock(&inode->i_lock); | |
5153 | if (blocks*512 < isize) { | |
5154 | pr_warn("swap activate: swapfile has holes\n"); | |
5155 | return -EINVAL; | |
5156 | } | |
5157 | *span = sis->pages; | |
5158 | ||
a0a3036b | 5159 | pr_warn_once("Swap support over SMB3 is experimental\n"); |
4e8aea30 SF |
5160 | |
5161 | /* | |
5162 | * TODO: consider adding ACL (or documenting how) to prevent other | |
5163 | * users (on this or other systems) from reading it | |
5164 | */ | |
5165 | ||
5166 | ||
5167 | /* TODO: add sk_set_memalloc(inet) or similar */ | |
5168 | ||
5169 | if (cfile) | |
5170 | cfile->swapfile = true; | |
5171 | /* | |
5172 | * TODO: Since file already open, we can't open with DENY_ALL here | |
5173 | * but we could add call to grab a byte range lock to prevent others | |
5174 | * from reading or writing the file | |
5175 | */ | |
5176 | ||
4b60c0ff N |
5177 | sis->flags |= SWP_FS_OPS; |
5178 | return add_swap_extent(sis, 0, sis->max, 0); | |
4e8aea30 SF |
5179 | } |
5180 | ||
5181 | static void cifs_swap_deactivate(struct file *file) | |
5182 | { | |
5183 | struct cifsFileInfo *cfile = file->private_data; | |
5184 | ||
5185 | cifs_dbg(FYI, "swap deactivate\n"); | |
5186 | ||
5187 | /* TODO: undo sk_set_memalloc(inet) will eventually be needed */ | |
5188 | ||
5189 | if (cfile) | |
5190 | cfile->swapfile = false; | |
5191 | ||
5192 | /* do we need to unpin (or unlock) the file */ | |
5193 | } | |
dca69288 | 5194 | |
70431bfd DH |
5195 | /* |
5196 | * Mark a page as having been made dirty and thus needing writeback. We also | |
5197 | * need to pin the cache object to write back to. | |
5198 | */ | |
5199 | #ifdef CONFIG_CIFS_FSCACHE | |
8fb72b4a | 5200 | static bool cifs_dirty_folio(struct address_space *mapping, struct folio *folio) |
70431bfd | 5201 | { |
8fb72b4a MWO |
5202 | return fscache_dirty_folio(mapping, folio, |
5203 | cifs_inode_cookie(mapping->host)); | |
70431bfd DH |
5204 | } |
5205 | #else | |
8fb72b4a | 5206 | #define cifs_dirty_folio filemap_dirty_folio |
70431bfd DH |
5207 | #endif |
5208 | ||
f5e54d6e | 5209 | const struct address_space_operations cifs_addr_ops = { |
ce3bb0d2 | 5210 | .read_folio = cifs_read_folio, |
052e04a5 | 5211 | .readahead = cifs_readahead, |
1da177e4 | 5212 | .writepage = cifs_writepage, |
37c0eb46 | 5213 | .writepages = cifs_writepages, |
d9414774 NP |
5214 | .write_begin = cifs_write_begin, |
5215 | .write_end = cifs_write_end, | |
8fb72b4a | 5216 | .dirty_folio = cifs_dirty_folio, |
eef15ea1 | 5217 | .release_folio = cifs_release_folio, |
dca69288 | 5218 | .direct_IO = cifs_direct_io, |
0eaf6052 | 5219 | .invalidate_folio = cifs_invalidate_folio, |
ff2b48b9 | 5220 | .launder_folio = cifs_launder_folio, |
4e8aea30 SF |
5221 | /* |
5222 | * TODO: investigate and if useful we could add an cifs_migratePage | |
5223 | * helper (under an CONFIG_MIGRATION) in the future, and also | |
5224 | * investigate and add an is_dirty_writeback helper if needed | |
5225 | */ | |
5226 | .swap_activate = cifs_swap_activate, | |
5227 | .swap_deactivate = cifs_swap_deactivate, | |
1da177e4 | 5228 | }; |
273d81d6 DK |
5229 | |
5230 | /* | |
ce3bb0d2 | 5231 | * cifs_readahead requires the server to support a buffer large enough to |
273d81d6 | 5232 | * contain the header plus one complete page of data. Otherwise, we need |
ce3bb0d2 | 5233 | * to leave cifs_readahead out of the address space operations. |
273d81d6 | 5234 | */ |
f5e54d6e | 5235 | const struct address_space_operations cifs_addr_ops_smallbuf = { |
ce3bb0d2 | 5236 | .read_folio = cifs_read_folio, |
273d81d6 DK |
5237 | .writepage = cifs_writepage, |
5238 | .writepages = cifs_writepages, | |
d9414774 NP |
5239 | .write_begin = cifs_write_begin, |
5240 | .write_end = cifs_write_end, | |
8fb72b4a | 5241 | .dirty_folio = cifs_dirty_folio, |
eef15ea1 | 5242 | .release_folio = cifs_release_folio, |
0eaf6052 | 5243 | .invalidate_folio = cifs_invalidate_folio, |
ff2b48b9 | 5244 | .launder_folio = cifs_launder_folio, |
273d81d6 | 5245 | }; |