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fs/9p: Add drop_inode 9p callback
[people/ms/linux.git] / fs / 9p / vfs_inode_dotl.c
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53c06f4e
AK		 1/*
2 * linux/fs/9p/vfs_inode_dotl.c
3 *
4 * This file contains vfs inode ops for the 9P2000.L protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
36#include <linux/sched.h>
37#include <linux/slab.h>
38#include <linux/xattr.h>
39#include <linux/posix_acl.h>
40#include <net/9p/9p.h>
41#include <net/9p/client.h>
42
43#include "v9fs.h"
44#include "v9fs_vfs.h"
45#include "fid.h"
46#include "cache.h"
47#include "xattr.h"
48#include "acl.h"
49
50static int
51v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
52 dev_t rdev);
53
54/**
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
58 */
59
60static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61{
62 BUG_ON(dir_inode == NULL);
63
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
67 }
68 return current_fsgid();
69}
70
71/**
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
73 * dir inode.
74 *
75 */
76
77static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
78{
79 struct dentry *dentry;
80
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
86 return dentry;
87}
88
5ffc0cb3
AK		 89static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
90 struct p9_qid *qid,
91 struct p9_fid *fid,
92 struct p9_stat_dotl *st)
93{
94 int retval;
95 unsigned long i_ino;
96 struct inode *inode;
97 struct v9fs_session_info *v9ses = sb->s_fs_info;
98
99 i_ino = v9fs_qid2ino(qid);
100 inode = iget_locked(sb, i_ino);
101 if (!inode)
102 return ERR_PTR(-ENOMEM);
103 if (!(inode->i_state & I_NEW))
104 return inode;
105 /*
106 * initialize the inode with the stat info
107 * FIXME!! we may need support for stale inodes
108 * later.
109 */
110 retval = v9fs_init_inode(v9ses, inode, st->st_mode);
111 if (retval)
112 goto error;
113
114 v9fs_stat2inode_dotl(st, inode);
115#ifdef CONFIG_9P_FSCACHE
a78ce05d 116 v9fs_fscache_set_key(inode, &st->qid);
5ffc0cb3
AK		 117 v9fs_cache_inode_get_cookie(inode);
118#endif
119 retval = v9fs_get_acl(inode, fid);
120 if (retval)
121 goto error;
122
123 unlock_new_inode(inode);
124 return inode;
125error:
126 unlock_new_inode(inode);
127 iput(inode);
128 return ERR_PTR(retval);
129
130}
131
53c06f4e 132struct inode *
a78ce05d
AK		 133v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
134 struct super_block *sb)
53c06f4e 135{
53c06f4e 136 struct p9_stat_dotl *st;
5ffc0cb3 137 struct inode *inode = NULL;
53c06f4e
AK		 138
139 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
140 if (IS_ERR(st))
141 return ERR_CAST(st);
142
5ffc0cb3 143 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st);
53c06f4e 144 kfree(st);
5ffc0cb3 145 return inode;
53c06f4e
AK		 146}
147
148/**
149 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
150 * @dir: directory inode that is being created
151 * @dentry: dentry that is being deleted
152 * @mode: create permissions
153 * @nd: path information
154 *
155 */
156
157static int
158v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
159 struct nameidata *nd)
160{
161 int err = 0;
53c06f4e
AK		 162 gid_t gid;
163 int flags;
164 mode_t mode;
6b39f6d2 165 char *name = NULL;
53c06f4e
AK		 166 struct file *filp;
167 struct p9_qid qid;
168 struct inode *inode;
6b39f6d2
AK		 169 struct p9_fid *fid = NULL;
170 struct v9fs_inode *v9inode;
171 struct p9_fid *dfid, *ofid, *inode_fid;
172 struct v9fs_session_info *v9ses;
53c06f4e
AK		 173 struct posix_acl *pacl = NULL, *dacl = NULL;
174
175 v9ses = v9fs_inode2v9ses(dir);
176 if (nd && nd->flags & LOOKUP_OPEN)
177 flags = nd->intent.open.flags - 1;
178 else {
179 /*
180 * create call without LOOKUP_OPEN is due
181 * to mknod of regular files. So use mknod
182 * operation.
183 */
184 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
185 }
186
187 name = (char *) dentry->d_name.name;
188 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
189 "mode:0x%x\n", name, flags, omode);
190
191 dfid = v9fs_fid_lookup(dentry->d_parent);
192 if (IS_ERR(dfid)) {
193 err = PTR_ERR(dfid);
194 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
195 return err;
196 }
197
198 /* clone a fid to use for creation */
199 ofid = p9_client_walk(dfid, 0, NULL, 1);
200 if (IS_ERR(ofid)) {
201 err = PTR_ERR(ofid);
202 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
203 return err;
204 }
205
206 gid = v9fs_get_fsgid_for_create(dir);
207
208 mode = omode;
209 /* Update mode based on ACL value */
210 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
211 if (err) {
212 P9_DPRINTK(P9_DEBUG_VFS,
213 "Failed to get acl values in creat %d\n", err);
214 goto error;
215 }
216 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
217 if (err < 0) {
218 P9_DPRINTK(P9_DEBUG_VFS,
219 "p9_client_open_dotl failed in creat %d\n",
220 err);
221 goto error;
222 }
53c06f4e 223
af7542fc
AK		 224 /* instantiate inode and assign the unopened fid to the dentry */
225 fid = p9_client_walk(dfid, 1, &name, 1);
226 if (IS_ERR(fid)) {
227 err = PTR_ERR(fid);
c25a61f5 228 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
53c06f4e 229 fid = NULL;
af7542fc 230 goto error;
53c06f4e 231 }
a78ce05d 232 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
af7542fc
AK		 233 if (IS_ERR(inode)) {
234 err = PTR_ERR(inode);
235 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
236 goto error;
237 }
af7542fc
AK		 238 d_instantiate(dentry, inode);
239 err = v9fs_fid_add(dentry, fid);
240 if (err < 0)
241 goto error;
242
53c06f4e
AK		 243 /* Now set the ACL based on the default value */
244 v9fs_set_create_acl(dentry, dacl, pacl);
6b39f6d2
AK		 245
246 v9inode = V9FS_I(inode);
247 if (v9ses->cache && !v9inode->writeback_fid) {
3cf387d7 248 /*
6b39f6d2 249 * clone a fid and add it to writeback_fid
3cf387d7
AK		 250 * we do it during open time instead of
251 * page dirty time via write_begin/page_mkwrite
252 * because we want write after unlink usecase
253 * to work.
254 */
255 inode_fid = v9fs_writeback_fid(dentry);
256 if (IS_ERR(inode_fid)) {
257 err = PTR_ERR(inode_fid);
258 goto error;
259 }
6b39f6d2 260 v9inode->writeback_fid = (void *) inode_fid;
3cf387d7 261 }
af7542fc
AK		 262 /* Since we are opening a file, assign the open fid to the file */
263 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
264 if (IS_ERR(filp)) {
53c06f4e 265 p9_client_clunk(ofid);
af7542fc
AK		 266 return PTR_ERR(filp);
267 }
268 filp->private_data = ofid;
46848de0
AK		 269#ifdef CONFIG_9P_FSCACHE
270 if (v9ses->cache)
271 v9fs_cache_inode_set_cookie(inode, filp);
272#endif
53c06f4e
AK		 273 return 0;
274
275error:
276 if (ofid)
277 p9_client_clunk(ofid);
278 if (fid)
279 p9_client_clunk(fid);
280 return err;
281}
282
283/**
284 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
285 * @dir: inode that is being unlinked
286 * @dentry: dentry that is being unlinked
287 * @mode: mode for new directory
288 *
289 */
290
291static int v9fs_vfs_mkdir_dotl(struct inode *dir,
292 struct dentry *dentry, int omode)
293{
294 int err;
295 struct v9fs_session_info *v9ses;
296 struct p9_fid *fid = NULL, *dfid = NULL;
297 gid_t gid;
298 char *name;
299 mode_t mode;
300 struct inode *inode;
301 struct p9_qid qid;
302 struct dentry *dir_dentry;
303 struct posix_acl *dacl = NULL, *pacl = NULL;
304
305 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
306 err = 0;
307 v9ses = v9fs_inode2v9ses(dir);
308
309 omode |= S_IFDIR;
310 if (dir->i_mode & S_ISGID)
311 omode |= S_ISGID;
312
313 dir_dentry = v9fs_dentry_from_dir_inode(dir);
314 dfid = v9fs_fid_lookup(dir_dentry);
315 if (IS_ERR(dfid)) {
316 err = PTR_ERR(dfid);
317 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
318 dfid = NULL;
319 goto error;
320 }
321
322 gid = v9fs_get_fsgid_for_create(dir);
323 mode = omode;
324 /* Update mode based on ACL value */
325 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
326 if (err) {
327 P9_DPRINTK(P9_DEBUG_VFS,
328 "Failed to get acl values in mkdir %d\n", err);
329 goto error;
330 }
331 name = (char *) dentry->d_name.name;
332 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
333 if (err < 0)
334 goto error;
335
336 /* instantiate inode and assign the unopened fid to the dentry */
337 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
338 fid = p9_client_walk(dfid, 1, &name, 1);
339 if (IS_ERR(fid)) {
340 err = PTR_ERR(fid);
341 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
342 err);
343 fid = NULL;
344 goto error;
345 }
346
a78ce05d 347 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 348 if (IS_ERR(inode)) {
349 err = PTR_ERR(inode);
350 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
351 err);
352 goto error;
353 }
53c06f4e
AK		 354 d_instantiate(dentry, inode);
355 err = v9fs_fid_add(dentry, fid);
356 if (err < 0)
357 goto error;
358 fid = NULL;
359 } else {
360 /*
361 * Not in cached mode. No need to populate
362 * inode with stat. We need to get an inode
363 * so that we can set the acl with dentry
364 */
365 inode = v9fs_get_inode(dir->i_sb, mode);
366 if (IS_ERR(inode)) {
367 err = PTR_ERR(inode);
368 goto error;
369 }
53c06f4e
AK		 370 d_instantiate(dentry, inode);
371 }
372 /* Now set the ACL based on the default value */
373 v9fs_set_create_acl(dentry, dacl, pacl);
374
375error:
376 if (fid)
377 p9_client_clunk(fid);
378 return err;
379}
380
381static int
382v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
383 struct kstat *stat)
384{
385 int err;
386 struct v9fs_session_info *v9ses;
387 struct p9_fid *fid;
388 struct p9_stat_dotl *st;
389
390 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
391 err = -EPERM;
392 v9ses = v9fs_inode2v9ses(dentry->d_inode);
a1211908
AK		 393 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
394 generic_fillattr(dentry->d_inode, stat);
395 return 0;
396 }
53c06f4e
AK		 397 fid = v9fs_fid_lookup(dentry);
398 if (IS_ERR(fid))
399 return PTR_ERR(fid);
400
401 /* Ask for all the fields in stat structure. Server will return
402 * whatever it supports
403 */
404
405 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
406 if (IS_ERR(st))
407 return PTR_ERR(st);
408
409 v9fs_stat2inode_dotl(st, dentry->d_inode);
410 generic_fillattr(dentry->d_inode, stat);
411 /* Change block size to what the server returned */
412 stat->blksize = st->st_blksize;
413
414 kfree(st);
415 return 0;
416}
417
418/**
419 * v9fs_vfs_setattr_dotl - set file metadata
420 * @dentry: file whose metadata to set
421 * @iattr: metadata assignment structure
422 *
423 */
424
425int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
426{
427 int retval;
428 struct v9fs_session_info *v9ses;
429 struct p9_fid *fid;
430 struct p9_iattr_dotl p9attr;
431
432 P9_DPRINTK(P9_DEBUG_VFS, "\n");
433
434 retval = inode_change_ok(dentry->d_inode, iattr);
435 if (retval)
436 return retval;
437
438 p9attr.valid = iattr->ia_valid;
439 p9attr.mode = iattr->ia_mode;
440 p9attr.uid = iattr->ia_uid;
441 p9attr.gid = iattr->ia_gid;
442 p9attr.size = iattr->ia_size;
443 p9attr.atime_sec = iattr->ia_atime.tv_sec;
444 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
445 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
446 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
447
448 retval = -EPERM;
449 v9ses = v9fs_inode2v9ses(dentry->d_inode);
450 fid = v9fs_fid_lookup(dentry);
451 if (IS_ERR(fid))
452 return PTR_ERR(fid);
453
454 retval = p9_client_setattr(fid, &p9attr);
455 if (retval < 0)
456 return retval;
457
458 if ((iattr->ia_valid & ATTR_SIZE) &&
459 iattr->ia_size != i_size_read(dentry->d_inode)) {
460 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
461 if (retval)
462 return retval;
463 }
464
465 setattr_copy(dentry->d_inode, iattr);
466 mark_inode_dirty(dentry->d_inode);
467 if (iattr->ia_valid & ATTR_MODE) {
468 /* We also want to update ACL when we update mode bits */
469 retval = v9fs_acl_chmod(dentry);
470 if (retval < 0)
471 return retval;
472 }
473 return 0;
474}
475
476/**
477 * v9fs_stat2inode_dotl - populate an inode structure with stat info
478 * @stat: stat structure
479 * @inode: inode to populate
480 * @sb: superblock of filesystem
481 *
482 */
483
484void
485v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
486{
487
488 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
489 inode->i_atime.tv_sec = stat->st_atime_sec;
490 inode->i_atime.tv_nsec = stat->st_atime_nsec;
491 inode->i_mtime.tv_sec = stat->st_mtime_sec;
492 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
493 inode->i_ctime.tv_sec = stat->st_ctime_sec;
494 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
495 inode->i_uid = stat->st_uid;
496 inode->i_gid = stat->st_gid;
497 inode->i_nlink = stat->st_nlink;
498 inode->i_mode = stat->st_mode;
499 inode->i_rdev = new_decode_dev(stat->st_rdev);
500
501 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
502 init_special_inode(inode, inode->i_mode, inode->i_rdev);
503
504 i_size_write(inode, stat->st_size);
505 inode->i_blocks = stat->st_blocks;
506 } else {
507 if (stat->st_result_mask & P9_STATS_ATIME) {
508 inode->i_atime.tv_sec = stat->st_atime_sec;
509 inode->i_atime.tv_nsec = stat->st_atime_nsec;
510 }
511 if (stat->st_result_mask & P9_STATS_MTIME) {
512 inode->i_mtime.tv_sec = stat->st_mtime_sec;
513 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
514 }
515 if (stat->st_result_mask & P9_STATS_CTIME) {
516 inode->i_ctime.tv_sec = stat->st_ctime_sec;
517 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
518 }
519 if (stat->st_result_mask & P9_STATS_UID)
520 inode->i_uid = stat->st_uid;
521 if (stat->st_result_mask & P9_STATS_GID)
522 inode->i_gid = stat->st_gid;
523 if (stat->st_result_mask & P9_STATS_NLINK)
524 inode->i_nlink = stat->st_nlink;
525 if (stat->st_result_mask & P9_STATS_MODE) {
526 inode->i_mode = stat->st_mode;
527 if ((S_ISBLK(inode->i_mode)) ||
528 (S_ISCHR(inode->i_mode)))
529 init_special_inode(inode, inode->i_mode,
530 inode->i_rdev);
531 }
532 if (stat->st_result_mask & P9_STATS_RDEV)
533 inode->i_rdev = new_decode_dev(stat->st_rdev);
534 if (stat->st_result_mask & P9_STATS_SIZE)
535 i_size_write(inode, stat->st_size);
536 if (stat->st_result_mask & P9_STATS_BLOCKS)
537 inode->i_blocks = stat->st_blocks;
538 }
539 if (stat->st_result_mask & P9_STATS_GEN)
540 inode->i_generation = stat->st_gen;
541
542 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
543 * because the inode structure does not have fields for them.
544 */
545}
546
547static int
548v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
549 const char *symname)
550{
551 struct v9fs_session_info *v9ses;
552 struct p9_fid *dfid;
553 struct p9_fid *fid = NULL;
554 struct inode *inode;
555 struct p9_qid qid;
556 char *name;
557 int err;
558 gid_t gid;
559
560 name = (char *) dentry->d_name.name;
561 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
562 dir->i_ino, name, symname);
563 v9ses = v9fs_inode2v9ses(dir);
564
565 dfid = v9fs_fid_lookup(dentry->d_parent);
566 if (IS_ERR(dfid)) {
567 err = PTR_ERR(dfid);
568 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
569 return err;
570 }
571
572 gid = v9fs_get_fsgid_for_create(dir);
573
574 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
575 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
576
577 if (err < 0) {
578 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
579 goto error;
580 }
581
582 if (v9ses->cache) {
583 /* Now walk from the parent so we can get an unopened fid. */
584 fid = p9_client_walk(dfid, 1, &name, 1);
585 if (IS_ERR(fid)) {
586 err = PTR_ERR(fid);
587 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
588 err);
589 fid = NULL;
590 goto error;
591 }
592
593 /* instantiate inode and assign the unopened fid to dentry */
a78ce05d 594 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 595 if (IS_ERR(inode)) {
596 err = PTR_ERR(inode);
597 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
598 err);
599 goto error;
600 }
53c06f4e
AK		 601 d_instantiate(dentry, inode);
602 err = v9fs_fid_add(dentry, fid);
603 if (err < 0)
604 goto error;
605 fid = NULL;
606 } else {
607 /* Not in cached mode. No need to populate inode with stat */
608 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
609 if (IS_ERR(inode)) {
610 err = PTR_ERR(inode);
611 goto error;
612 }
53c06f4e
AK		 613 d_instantiate(dentry, inode);
614 }
615
616error:
617 if (fid)
618 p9_client_clunk(fid);
619
620 return err;
621}
622
623/**
624 * v9fs_vfs_link_dotl - create a hardlink for dotl
625 * @old_dentry: dentry for file to link to
626 * @dir: inode destination for new link
627 * @dentry: dentry for link
628 *
629 */
630
631static int
632v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
633 struct dentry *dentry)
634{
635 int err;
636 struct p9_fid *dfid, *oldfid;
637 char *name;
638 struct v9fs_session_info *v9ses;
639 struct dentry *dir_dentry;
640
641 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
642 dir->i_ino, old_dentry->d_name.name,
643 dentry->d_name.name);
644
645 v9ses = v9fs_inode2v9ses(dir);
646 dir_dentry = v9fs_dentry_from_dir_inode(dir);
647 dfid = v9fs_fid_lookup(dir_dentry);
648 if (IS_ERR(dfid))
649 return PTR_ERR(dfid);
650
651 oldfid = v9fs_fid_lookup(old_dentry);
652 if (IS_ERR(oldfid))
653 return PTR_ERR(oldfid);
654
655 name = (char *) dentry->d_name.name;
656
657 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
658
659 if (err < 0) {
660 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
661 return err;
662 }
663
664 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
665 /* Get the latest stat info from server. */
666 struct p9_fid *fid;
667 struct p9_stat_dotl *st;
668
669 fid = v9fs_fid_lookup(old_dentry);
670 if (IS_ERR(fid))
671 return PTR_ERR(fid);
672
673 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
674 if (IS_ERR(st))
675 return PTR_ERR(st);
676
677 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
678
679 kfree(st);
53c06f4e 680 }
20656a49 681 ihold(old_dentry->d_inode);
53c06f4e
AK		 682 d_instantiate(dentry, old_dentry->d_inode);
683
684 return err;
685}
686
687/**
688 * v9fs_vfs_mknod_dotl - create a special file
689 * @dir: inode destination for new link
690 * @dentry: dentry for file
691 * @mode: mode for creation
692 * @rdev: device associated with special file
693 *
694 */
695static int
696v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
697 dev_t rdev)
698{
699 int err;
700 char *name;
701 mode_t mode;
702 struct v9fs_session_info *v9ses;
703 struct p9_fid *fid = NULL, *dfid = NULL;
704 struct inode *inode;
705 gid_t gid;
706 struct p9_qid qid;
707 struct dentry *dir_dentry;
708 struct posix_acl *dacl = NULL, *pacl = NULL;
709
710 P9_DPRINTK(P9_DEBUG_VFS,
711 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
712 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
713
714 if (!new_valid_dev(rdev))
715 return -EINVAL;
716
717 v9ses = v9fs_inode2v9ses(dir);
718 dir_dentry = v9fs_dentry_from_dir_inode(dir);
719 dfid = v9fs_fid_lookup(dir_dentry);
720 if (IS_ERR(dfid)) {
721 err = PTR_ERR(dfid);
722 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
723 dfid = NULL;
724 goto error;
725 }
726
727 gid = v9fs_get_fsgid_for_create(dir);
728 mode = omode;
729 /* Update mode based on ACL value */
730 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
731 if (err) {
732 P9_DPRINTK(P9_DEBUG_VFS,
733 "Failed to get acl values in mknod %d\n", err);
734 goto error;
735 }
736 name = (char *) dentry->d_name.name;
737
738 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
739 if (err < 0)
740 goto error;
741
742 /* instantiate inode and assign the unopened fid to the dentry */
743 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
744 fid = p9_client_walk(dfid, 1, &name, 1);
745 if (IS_ERR(fid)) {
746 err = PTR_ERR(fid);
747 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
748 err);
749 fid = NULL;
750 goto error;
751 }
752
a78ce05d 753 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 754 if (IS_ERR(inode)) {
755 err = PTR_ERR(inode);
756 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
757 err);
758 goto error;
759 }
53c06f4e
AK		 760 d_instantiate(dentry, inode);
761 err = v9fs_fid_add(dentry, fid);
762 if (err < 0)
763 goto error;
764 fid = NULL;
765 } else {
766 /*
767 * Not in cached mode. No need to populate inode with stat.
768 * socket syscall returns a fd, so we need instantiate
769 */
770 inode = v9fs_get_inode(dir->i_sb, mode);
771 if (IS_ERR(inode)) {
772 err = PTR_ERR(inode);
773 goto error;
774 }
53c06f4e
AK		 775 d_instantiate(dentry, inode);
776 }
777 /* Now set the ACL based on the default value */
778 v9fs_set_create_acl(dentry, dacl, pacl);
779error:
780 if (fid)
781 p9_client_clunk(fid);
782 return err;
783}
784
53c06f4e
AK		 785/**
786 * v9fs_vfs_follow_link_dotl - follow a symlink path
787 * @dentry: dentry for symlink
788 * @nd: nameidata
789 *
790 */
791
792static void *
793v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
794{
31b6ceac
MK		 795 int retval;
796 struct p9_fid *fid;
53c06f4e 797 char *link = __getname();
31b6ceac 798 char *target;
53c06f4e 799
31b6ceac 800 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
53c06f4e 801
31b6ceac 802 if (!link) {
53c06f4e 803 link = ERR_PTR(-ENOMEM);
31b6ceac 804 goto ndset;
53c06f4e 805 }
31b6ceac
MK		 806 fid = v9fs_fid_lookup(dentry);
807 if (IS_ERR(fid)) {
808 __putname(link);
809 link = ERR_PTR(PTR_ERR(fid));
810 goto ndset;
811 }
812 retval = p9_client_readlink(fid, &target);
813 if (!retval) {
814 strcpy(link, target);
815 kfree(target);
816 goto ndset;
817 }
818 __putname(link);
819 link = ERR_PTR(retval);
820ndset:
53c06f4e 821 nd_set_link(nd, link);
53c06f4e
AK		 822 return NULL;
823}
824
825const struct inode_operations v9fs_dir_inode_operations_dotl = {
826 .create = v9fs_vfs_create_dotl,
827 .lookup = v9fs_vfs_lookup,
828 .link = v9fs_vfs_link_dotl,
829 .symlink = v9fs_vfs_symlink_dotl,
830 .unlink = v9fs_vfs_unlink,
831 .mkdir = v9fs_vfs_mkdir_dotl,
832 .rmdir = v9fs_vfs_rmdir,
833 .mknod = v9fs_vfs_mknod_dotl,
834 .rename = v9fs_vfs_rename,
835 .getattr = v9fs_vfs_getattr_dotl,
836 .setattr = v9fs_vfs_setattr_dotl,
837 .setxattr = generic_setxattr,
838 .getxattr = generic_getxattr,
839 .removexattr = generic_removexattr,
840 .listxattr = v9fs_listxattr,
841 .check_acl = v9fs_check_acl,
842};
843
844const struct inode_operations v9fs_file_inode_operations_dotl = {
845 .getattr = v9fs_vfs_getattr_dotl,
846 .setattr = v9fs_vfs_setattr_dotl,
847 .setxattr = generic_setxattr,
848 .getxattr = generic_getxattr,
849 .removexattr = generic_removexattr,
850 .listxattr = v9fs_listxattr,
851 .check_acl = v9fs_check_acl,
852};
853
854const struct inode_operations v9fs_symlink_inode_operations_dotl = {
31b6ceac 855 .readlink = generic_readlink,
53c06f4e
AK		 856 .follow_link = v9fs_vfs_follow_link_dotl,
857 .put_link = v9fs_vfs_put_link,
858 .getattr = v9fs_vfs_getattr_dotl,
859 .setattr = v9fs_vfs_setattr_dotl,
860 .setxattr = generic_setxattr,
861 .getxattr = generic_getxattr,
862 .removexattr = generic_removexattr,
863 .listxattr = v9fs_listxattr,
864};
Michael's Linux tree.