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ksmbd: auth: fix most kernel-doc warnings
[thirdparty/linux.git] / fs / smb / server / vfs.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4 * Copyright (C) 2018 Samsung Electronics Co., Ltd.
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/fs.h>
9 #include <linux/filelock.h>
10 #include <linux/uaccess.h>
11 #include <linux/backing-dev.h>
12 #include <linux/writeback.h>
13 #include <linux/xattr.h>
14 #include <linux/falloc.h>
15 #include <linux/fsnotify.h>
16 #include <linux/dcache.h>
17 #include <linux/slab.h>
18 #include <linux/vmalloc.h>
19 #include <linux/sched/xacct.h>
20 #include <linux/crc32c.h>
21 #include <linux/namei.h>
22
23 #include "glob.h"
24 #include "oplock.h"
25 #include "connection.h"
26 #include "vfs.h"
27 #include "vfs_cache.h"
28 #include "smbacl.h"
29 #include "ndr.h"
30 #include "auth.h"
31 #include "misc.h"
32
33 #include "smb_common.h"
34 #include "mgmt/share_config.h"
35 #include "mgmt/tree_connect.h"
36 #include "mgmt/user_session.h"
37 #include "mgmt/user_config.h"
38
39 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
40 struct inode *parent_inode,
41 struct inode *inode)
42 {
43 if (!test_share_config_flag(work->tcon->share_conf,
44 KSMBD_SHARE_FLAG_INHERIT_OWNER))
45 return;
46
47 i_uid_write(inode, i_uid_read(parent_inode));
48 }
49
50 /**
51 * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
52 */
53 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
54 {
55 inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
56 if (child->d_parent != parent) {
57 inode_unlock(d_inode(parent));
58 return -ENOENT;
59 }
60
61 return 0;
62 }
63
64 static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
65 char *pathname, unsigned int flags,
66 struct path *parent_path,
67 struct path *path)
68 {
69 struct qstr last;
70 struct filename *filename;
71 struct path *root_share_path = &share_conf->vfs_path;
72 int err, type;
73 struct dentry *d;
74
75 if (pathname[0] == '\0') {
76 pathname = share_conf->path;
77 root_share_path = NULL;
78 } else {
79 flags |= LOOKUP_BENEATH;
80 }
81
82 filename = getname_kernel(pathname);
83 if (IS_ERR(filename))
84 return PTR_ERR(filename);
85
86 err = vfs_path_parent_lookup(filename, flags,
87 parent_path, &last, &type,
88 root_share_path);
89 if (err) {
90 putname(filename);
91 return err;
92 }
93
94 if (unlikely(type != LAST_NORM)) {
95 path_put(parent_path);
96 putname(filename);
97 return -ENOENT;
98 }
99
100 err = mnt_want_write(parent_path->mnt);
101 if (err) {
102 path_put(parent_path);
103 putname(filename);
104 return -ENOENT;
105 }
106
107 inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
108 d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
109 if (IS_ERR(d))
110 goto err_out;
111
112 if (d_is_negative(d)) {
113 dput(d);
114 goto err_out;
115 }
116
117 path->dentry = d;
118 path->mnt = mntget(parent_path->mnt);
119
120 if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
121 err = follow_down(path, 0);
122 if (err < 0) {
123 path_put(path);
124 goto err_out;
125 }
126 }
127
128 putname(filename);
129 return 0;
130
131 err_out:
132 inode_unlock(d_inode(parent_path->dentry));
133 mnt_drop_write(parent_path->mnt);
134 path_put(parent_path);
135 putname(filename);
136 return -ENOENT;
137 }
138
139 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
140 struct dentry *dentry, __le32 *daccess)
141 {
142 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
143
144 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
145 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
146 FILE_WRITE_DATA | FILE_APPEND_DATA |
147 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
148 FILE_DELETE_CHILD);
149
150 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
151 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
152
153 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
154 *daccess |= FILE_EXECUTE_LE;
155
156 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
157 *daccess |= FILE_DELETE_LE;
158 }
159
160 /**
161 * ksmbd_vfs_create() - vfs helper for smb create file
162 * @work: work
163 * @name: file name that is relative to share
164 * @mode: file create mode
165 *
166 * Return: 0 on success, otherwise error
167 */
168 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
169 {
170 struct path path;
171 struct dentry *dentry;
172 int err;
173
174 dentry = ksmbd_vfs_kern_path_create(work, name,
175 LOOKUP_NO_SYMLINKS, &path);
176 if (IS_ERR(dentry)) {
177 err = PTR_ERR(dentry);
178 if (err != -ENOENT)
179 pr_err("path create failed for %s, err %d\n",
180 name, err);
181 return err;
182 }
183
184 mode |= S_IFREG;
185 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
186 dentry, mode, true);
187 if (!err) {
188 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
189 d_inode(dentry));
190 } else {
191 pr_err("File(%s): creation failed (err:%d)\n", name, err);
192 }
193
194 done_path_create(&path, dentry);
195 return err;
196 }
197
198 /**
199 * ksmbd_vfs_mkdir() - vfs helper for smb create directory
200 * @work: work
201 * @name: directory name that is relative to share
202 * @mode: directory create mode
203 *
204 * Return: 0 on success, otherwise error
205 */
206 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
207 {
208 struct mnt_idmap *idmap;
209 struct path path;
210 struct dentry *dentry;
211 int err;
212
213 dentry = ksmbd_vfs_kern_path_create(work, name,
214 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
215 &path);
216 if (IS_ERR(dentry)) {
217 err = PTR_ERR(dentry);
218 if (err != -EEXIST)
219 ksmbd_debug(VFS, "path create failed for %s, err %d\n",
220 name, err);
221 return err;
222 }
223
224 idmap = mnt_idmap(path.mnt);
225 mode |= S_IFDIR;
226 err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
227 if (!err && d_unhashed(dentry)) {
228 struct dentry *d;
229
230 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
231 dentry->d_name.len);
232 if (IS_ERR(d)) {
233 err = PTR_ERR(d);
234 goto out_err;
235 }
236 if (unlikely(d_is_negative(d))) {
237 dput(d);
238 err = -ENOENT;
239 goto out_err;
240 }
241
242 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
243 dput(d);
244 }
245
246 out_err:
247 done_path_create(&path, dentry);
248 if (err)
249 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
250 return err;
251 }
252
253 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
254 struct dentry *dentry, char *attr_name,
255 int attr_name_len, char **attr_value)
256 {
257 char *name, *xattr_list = NULL;
258 ssize_t value_len = -ENOENT, xattr_list_len;
259
260 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
261 if (xattr_list_len <= 0)
262 goto out;
263
264 for (name = xattr_list; name - xattr_list < xattr_list_len;
265 name += strlen(name) + 1) {
266 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
267 if (strncasecmp(attr_name, name, attr_name_len))
268 continue;
269
270 value_len = ksmbd_vfs_getxattr(idmap,
271 dentry,
272 name,
273 attr_value);
274 if (value_len < 0)
275 pr_err("failed to get xattr in file\n");
276 break;
277 }
278
279 out:
280 kvfree(xattr_list);
281 return value_len;
282 }
283
284 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
285 size_t count)
286 {
287 ssize_t v_len;
288 char *stream_buf = NULL;
289
290 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
291 *pos, count);
292
293 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
294 fp->filp->f_path.dentry,
295 fp->stream.name,
296 fp->stream.size,
297 &stream_buf);
298 if ((int)v_len <= 0)
299 return (int)v_len;
300
301 if (v_len <= *pos) {
302 count = -EINVAL;
303 goto free_buf;
304 }
305
306 if (v_len - *pos < count)
307 count = v_len - *pos;
308
309 memcpy(buf, &stream_buf[*pos], count);
310
311 free_buf:
312 kvfree(stream_buf);
313 return count;
314 }
315
316 /**
317 * check_lock_range() - vfs helper for smb byte range file locking
318 * @filp: the file to apply the lock to
319 * @start: lock start byte offset
320 * @end: lock end byte offset
321 * @type: byte range type read/write
322 *
323 * Return: 0 on success, otherwise error
324 */
325 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
326 unsigned char type)
327 {
328 struct file_lock *flock;
329 struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
330 int error = 0;
331
332 if (!ctx || list_empty_careful(&ctx->flc_posix))
333 return 0;
334
335 spin_lock(&ctx->flc_lock);
336 list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
337 /* check conflict locks */
338 if (flock->fl_end >= start && end >= flock->fl_start) {
339 if (flock->fl_type == F_RDLCK) {
340 if (type == WRITE) {
341 pr_err("not allow write by shared lock\n");
342 error = 1;
343 goto out;
344 }
345 } else if (flock->fl_type == F_WRLCK) {
346 /* check owner in lock */
347 if (flock->fl_file != filp) {
348 error = 1;
349 pr_err("not allow rw access by exclusive lock from other opens\n");
350 goto out;
351 }
352 }
353 }
354 }
355 out:
356 spin_unlock(&ctx->flc_lock);
357 return error;
358 }
359
360 /**
361 * ksmbd_vfs_read() - vfs helper for smb file read
362 * @work: smb work
363 * @fid: file id of open file
364 * @count: read byte count
365 * @pos: file pos
366 * @rbuf: read data buffer
367 *
368 * Return: number of read bytes on success, otherwise error
369 */
370 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
371 loff_t *pos, char *rbuf)
372 {
373 struct file *filp = fp->filp;
374 ssize_t nbytes = 0;
375 struct inode *inode = file_inode(filp);
376
377 if (S_ISDIR(inode->i_mode))
378 return -EISDIR;
379
380 if (unlikely(count == 0))
381 return 0;
382
383 if (work->conn->connection_type) {
384 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
385 pr_err("no right to read(%pD)\n", fp->filp);
386 return -EACCES;
387 }
388 }
389
390 if (ksmbd_stream_fd(fp))
391 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
392
393 if (!work->tcon->posix_extensions) {
394 int ret;
395
396 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
397 if (ret) {
398 pr_err("unable to read due to lock\n");
399 return -EAGAIN;
400 }
401 }
402
403 nbytes = kernel_read(filp, rbuf, count, pos);
404 if (nbytes < 0) {
405 pr_err("smb read failed, err = %zd\n", nbytes);
406 return nbytes;
407 }
408
409 filp->f_pos = *pos;
410 return nbytes;
411 }
412
413 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
414 size_t count)
415 {
416 char *stream_buf = NULL, *wbuf;
417 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
418 size_t size;
419 ssize_t v_len;
420 int err = 0;
421
422 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
423 *pos, count);
424
425 size = *pos + count;
426 if (size > XATTR_SIZE_MAX) {
427 size = XATTR_SIZE_MAX;
428 count = (*pos + count) - XATTR_SIZE_MAX;
429 }
430
431 v_len = ksmbd_vfs_getcasexattr(idmap,
432 fp->filp->f_path.dentry,
433 fp->stream.name,
434 fp->stream.size,
435 &stream_buf);
436 if (v_len < 0) {
437 pr_err("not found stream in xattr : %zd\n", v_len);
438 err = v_len;
439 goto out;
440 }
441
442 if (v_len < size) {
443 wbuf = kvzalloc(size, GFP_KERNEL);
444 if (!wbuf) {
445 err = -ENOMEM;
446 goto out;
447 }
448
449 if (v_len > 0)
450 memcpy(wbuf, stream_buf, v_len);
451 kvfree(stream_buf);
452 stream_buf = wbuf;
453 }
454
455 memcpy(&stream_buf[*pos], buf, count);
456
457 err = ksmbd_vfs_setxattr(idmap,
458 &fp->filp->f_path,
459 fp->stream.name,
460 (void *)stream_buf,
461 size,
462 0,
463 true);
464 if (err < 0)
465 goto out;
466
467 fp->filp->f_pos = *pos;
468 err = 0;
469 out:
470 kvfree(stream_buf);
471 return err;
472 }
473
474 /**
475 * ksmbd_vfs_write() - vfs helper for smb file write
476 * @work: work
477 * @fid: file id of open file
478 * @buf: buf containing data for writing
479 * @count: read byte count
480 * @pos: file pos
481 * @sync: fsync after write
482 * @written: number of bytes written
483 *
484 * Return: 0 on success, otherwise error
485 */
486 int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
487 char *buf, size_t count, loff_t *pos, bool sync,
488 ssize_t *written)
489 {
490 struct file *filp;
491 loff_t offset = *pos;
492 int err = 0;
493
494 if (work->conn->connection_type) {
495 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
496 pr_err("no right to write(%pD)\n", fp->filp);
497 err = -EACCES;
498 goto out;
499 }
500 }
501
502 filp = fp->filp;
503
504 if (ksmbd_stream_fd(fp)) {
505 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
506 if (!err)
507 *written = count;
508 goto out;
509 }
510
511 if (!work->tcon->posix_extensions) {
512 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
513 if (err) {
514 pr_err("unable to write due to lock\n");
515 err = -EAGAIN;
516 goto out;
517 }
518 }
519
520 /* Reserve lease break for parent dir at closing time */
521 fp->reserve_lease_break = true;
522
523 /* Do we need to break any of a levelII oplock? */
524 smb_break_all_levII_oplock(work, fp, 1);
525
526 err = kernel_write(filp, buf, count, pos);
527 if (err < 0) {
528 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
529 goto out;
530 }
531
532 filp->f_pos = *pos;
533 *written = err;
534 err = 0;
535 if (sync) {
536 err = vfs_fsync_range(filp, offset, offset + *written, 0);
537 if (err < 0)
538 pr_err("fsync failed for filename = %pD, err = %d\n",
539 fp->filp, err);
540 }
541
542 out:
543 return err;
544 }
545
546 /**
547 * ksmbd_vfs_getattr() - vfs helper for smb getattr
548 * @work: work
549 * @fid: file id of open file
550 * @attrs: inode attributes
551 *
552 * Return: 0 on success, otherwise error
553 */
554 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
555 {
556 int err;
557
558 err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
559 if (err)
560 pr_err("getattr failed, err %d\n", err);
561 return err;
562 }
563
564 /**
565 * ksmbd_vfs_fsync() - vfs helper for smb fsync
566 * @work: work
567 * @fid: file id of open file
568 *
569 * Return: 0 on success, otherwise error
570 */
571 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
572 {
573 struct ksmbd_file *fp;
574 int err;
575
576 fp = ksmbd_lookup_fd_slow(work, fid, p_id);
577 if (!fp) {
578 pr_err("failed to get filp for fid %llu\n", fid);
579 return -ENOENT;
580 }
581 err = vfs_fsync(fp->filp, 0);
582 if (err < 0)
583 pr_err("smb fsync failed, err = %d\n", err);
584 ksmbd_fd_put(work, fp);
585 return err;
586 }
587
588 /**
589 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
590 * @name: directory or file name that is relative to share
591 *
592 * Return: 0 on success, otherwise error
593 */
594 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
595 {
596 struct mnt_idmap *idmap;
597 struct dentry *parent = path->dentry->d_parent;
598 int err;
599
600 if (ksmbd_override_fsids(work))
601 return -ENOMEM;
602
603 if (!d_inode(path->dentry)->i_nlink) {
604 err = -ENOENT;
605 goto out_err;
606 }
607
608 idmap = mnt_idmap(path->mnt);
609 if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
610 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
611 if (err && err != -ENOTEMPTY)
612 ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
613 } else {
614 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
615 if (err)
616 ksmbd_debug(VFS, "unlink failed, err %d\n", err);
617 }
618
619 out_err:
620 ksmbd_revert_fsids(work);
621 return err;
622 }
623
624 /**
625 * ksmbd_vfs_link() - vfs helper for creating smb hardlink
626 * @oldname: source file name
627 * @newname: hardlink name that is relative to share
628 *
629 * Return: 0 on success, otherwise error
630 */
631 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
632 const char *newname)
633 {
634 struct path oldpath, newpath;
635 struct dentry *dentry;
636 int err;
637
638 if (ksmbd_override_fsids(work))
639 return -ENOMEM;
640
641 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
642 if (err) {
643 pr_err("cannot get linux path for %s, err = %d\n",
644 oldname, err);
645 goto out1;
646 }
647
648 dentry = ksmbd_vfs_kern_path_create(work, newname,
649 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
650 &newpath);
651 if (IS_ERR(dentry)) {
652 err = PTR_ERR(dentry);
653 pr_err("path create err for %s, err %d\n", newname, err);
654 goto out2;
655 }
656
657 err = -EXDEV;
658 if (oldpath.mnt != newpath.mnt) {
659 pr_err("vfs_link failed err %d\n", err);
660 goto out3;
661 }
662
663 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
664 d_inode(newpath.dentry),
665 dentry, NULL);
666 if (err)
667 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
668
669 out3:
670 done_path_create(&newpath, dentry);
671 out2:
672 path_put(&oldpath);
673 out1:
674 ksmbd_revert_fsids(work);
675 return err;
676 }
677
678 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
679 char *newname, int flags)
680 {
681 struct dentry *old_parent, *new_dentry, *trap;
682 struct dentry *old_child = old_path->dentry;
683 struct path new_path;
684 struct qstr new_last;
685 struct renamedata rd;
686 struct filename *to;
687 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
688 struct ksmbd_file *parent_fp;
689 int new_type;
690 int err, lookup_flags = LOOKUP_NO_SYMLINKS;
691
692 if (ksmbd_override_fsids(work))
693 return -ENOMEM;
694
695 to = getname_kernel(newname);
696 if (IS_ERR(to)) {
697 err = PTR_ERR(to);
698 goto revert_fsids;
699 }
700
701 retry:
702 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
703 &new_path, &new_last, &new_type,
704 &share_conf->vfs_path);
705 if (err)
706 goto out1;
707
708 if (old_path->mnt != new_path.mnt) {
709 err = -EXDEV;
710 goto out2;
711 }
712
713 err = mnt_want_write(old_path->mnt);
714 if (err)
715 goto out2;
716
717 trap = lock_rename_child(old_child, new_path.dentry);
718
719 old_parent = dget(old_child->d_parent);
720 if (d_unhashed(old_child)) {
721 err = -EINVAL;
722 goto out3;
723 }
724
725 parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
726 if (parent_fp) {
727 if (parent_fp->daccess & FILE_DELETE_LE) {
728 pr_err("parent dir is opened with delete access\n");
729 err = -ESHARE;
730 ksmbd_fd_put(work, parent_fp);
731 goto out3;
732 }
733 ksmbd_fd_put(work, parent_fp);
734 }
735
736 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
737 lookup_flags | LOOKUP_RENAME_TARGET);
738 if (IS_ERR(new_dentry)) {
739 err = PTR_ERR(new_dentry);
740 goto out3;
741 }
742
743 if (d_is_symlink(new_dentry)) {
744 err = -EACCES;
745 goto out4;
746 }
747
748 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
749 err = -EEXIST;
750 goto out4;
751 }
752
753 if (old_child == trap) {
754 err = -EINVAL;
755 goto out4;
756 }
757
758 if (new_dentry == trap) {
759 err = -ENOTEMPTY;
760 goto out4;
761 }
762
763 rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
764 rd.old_dir = d_inode(old_parent),
765 rd.old_dentry = old_child,
766 rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
767 rd.new_dir = new_path.dentry->d_inode,
768 rd.new_dentry = new_dentry,
769 rd.flags = flags,
770 rd.delegated_inode = NULL,
771 err = vfs_rename(&rd);
772 if (err)
773 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
774
775 out4:
776 dput(new_dentry);
777 out3:
778 dput(old_parent);
779 unlock_rename(old_parent, new_path.dentry);
780 mnt_drop_write(old_path->mnt);
781 out2:
782 path_put(&new_path);
783
784 if (retry_estale(err, lookup_flags)) {
785 lookup_flags |= LOOKUP_REVAL;
786 goto retry;
787 }
788 out1:
789 putname(to);
790 revert_fsids:
791 ksmbd_revert_fsids(work);
792 return err;
793 }
794
795 /**
796 * ksmbd_vfs_truncate() - vfs helper for smb file truncate
797 * @work: work
798 * @fid: file id of old file
799 * @size: truncate to given size
800 *
801 * Return: 0 on success, otherwise error
802 */
803 int ksmbd_vfs_truncate(struct ksmbd_work *work,
804 struct ksmbd_file *fp, loff_t size)
805 {
806 int err = 0;
807 struct file *filp;
808
809 filp = fp->filp;
810
811 /* Do we need to break any of a levelII oplock? */
812 smb_break_all_levII_oplock(work, fp, 1);
813
814 if (!work->tcon->posix_extensions) {
815 struct inode *inode = file_inode(filp);
816
817 if (size < inode->i_size) {
818 err = check_lock_range(filp, size,
819 inode->i_size - 1, WRITE);
820 } else {
821 err = check_lock_range(filp, inode->i_size,
822 size - 1, WRITE);
823 }
824
825 if (err) {
826 pr_err("failed due to lock\n");
827 return -EAGAIN;
828 }
829 }
830
831 err = vfs_truncate(&filp->f_path, size);
832 if (err)
833 pr_err("truncate failed, err %d\n", err);
834 return err;
835 }
836
837 /**
838 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
839 * @dentry: dentry of file for listing xattrs
840 * @list: destination buffer
841 * @size: destination buffer length
842 *
843 * Return: xattr list length on success, otherwise error
844 */
845 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
846 {
847 ssize_t size;
848 char *vlist = NULL;
849
850 size = vfs_listxattr(dentry, NULL, 0);
851 if (size <= 0)
852 return size;
853
854 vlist = kvzalloc(size, GFP_KERNEL);
855 if (!vlist)
856 return -ENOMEM;
857
858 *list = vlist;
859 size = vfs_listxattr(dentry, vlist, size);
860 if (size < 0) {
861 ksmbd_debug(VFS, "listxattr failed\n");
862 kvfree(vlist);
863 *list = NULL;
864 }
865
866 return size;
867 }
868
869 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
870 struct dentry *dentry, char *xattr_name)
871 {
872 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
873 }
874
875 /**
876 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
877 * @idmap: idmap
878 * @dentry: dentry of file for getting xattrs
879 * @xattr_name: name of xattr name to query
880 * @xattr_buf: destination buffer xattr value
881 *
882 * Return: read xattr value length on success, otherwise error
883 */
884 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
885 struct dentry *dentry,
886 char *xattr_name, char **xattr_buf)
887 {
888 ssize_t xattr_len;
889 char *buf;
890
891 *xattr_buf = NULL;
892 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
893 if (xattr_len < 0)
894 return xattr_len;
895
896 buf = kmalloc(xattr_len + 1, GFP_KERNEL);
897 if (!buf)
898 return -ENOMEM;
899
900 xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
901 (void *)buf, xattr_len);
902 if (xattr_len > 0)
903 *xattr_buf = buf;
904 else
905 kfree(buf);
906 return xattr_len;
907 }
908
909 /**
910 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
911 * @idmap: idmap of the relevant mount
912 * @path: path of dentry to set XATTR at
913 * @attr_name: xattr name for setxattr
914 * @attr_value: xattr value to set
915 * @attr_size: size of xattr value
916 * @flags: destination buffer length
917 * @get_write: get write access to a mount
918 *
919 * Return: 0 on success, otherwise error
920 */
921 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
922 const struct path *path, const char *attr_name,
923 void *attr_value, size_t attr_size, int flags,
924 bool get_write)
925 {
926 int err;
927
928 if (get_write == true) {
929 err = mnt_want_write(path->mnt);
930 if (err)
931 return err;
932 }
933
934 err = vfs_setxattr(idmap,
935 path->dentry,
936 attr_name,
937 attr_value,
938 attr_size,
939 flags);
940 if (err)
941 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
942 if (get_write == true)
943 mnt_drop_write(path->mnt);
944 return err;
945 }
946
947 /**
948 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
949 * @filp: file pointer for IO
950 * @options: smb IO options
951 */
952 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
953 {
954 struct address_space *mapping;
955
956 mapping = filp->f_mapping;
957
958 if (!option || !mapping)
959 return;
960
961 if (option & FILE_WRITE_THROUGH_LE) {
962 filp->f_flags |= O_SYNC;
963 } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
964 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
965 spin_lock(&filp->f_lock);
966 filp->f_mode &= ~FMODE_RANDOM;
967 spin_unlock(&filp->f_lock);
968 } else if (option & FILE_RANDOM_ACCESS_LE) {
969 spin_lock(&filp->f_lock);
970 filp->f_mode |= FMODE_RANDOM;
971 spin_unlock(&filp->f_lock);
972 }
973 }
974
975 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
976 loff_t off, loff_t len)
977 {
978 smb_break_all_levII_oplock(work, fp, 1);
979 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
980 return vfs_fallocate(fp->filp,
981 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
982 off, len);
983
984 return vfs_fallocate(fp->filp,
985 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
986 off, len);
987 }
988
989 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
990 struct file_allocated_range_buffer *ranges,
991 unsigned int in_count, unsigned int *out_count)
992 {
993 struct file *f = fp->filp;
994 struct inode *inode = file_inode(fp->filp);
995 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
996 loff_t extent_start, extent_end;
997 int ret = 0;
998
999 if (start > maxbytes)
1000 return -EFBIG;
1001
1002 if (!in_count)
1003 return 0;
1004
1005 /*
1006 * Shrink request scope to what the fs can actually handle.
1007 */
1008 if (length > maxbytes || (maxbytes - length) < start)
1009 length = maxbytes - start;
1010
1011 if (start + length > inode->i_size)
1012 length = inode->i_size - start;
1013
1014 *out_count = 0;
1015 end = start + length;
1016 while (start < end && *out_count < in_count) {
1017 extent_start = vfs_llseek(f, start, SEEK_DATA);
1018 if (extent_start < 0) {
1019 if (extent_start != -ENXIO)
1020 ret = (int)extent_start;
1021 break;
1022 }
1023
1024 if (extent_start >= end)
1025 break;
1026
1027 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1028 if (extent_end < 0) {
1029 if (extent_end != -ENXIO)
1030 ret = (int)extent_end;
1031 break;
1032 } else if (extent_start >= extent_end) {
1033 break;
1034 }
1035
1036 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1037 ranges[(*out_count)++].length =
1038 cpu_to_le64(min(extent_end, end) - extent_start);
1039
1040 start = extent_end;
1041 }
1042
1043 return ret;
1044 }
1045
1046 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1047 const struct path *path, char *attr_name)
1048 {
1049 int err;
1050
1051 err = mnt_want_write(path->mnt);
1052 if (err)
1053 return err;
1054
1055 err = vfs_removexattr(idmap, path->dentry, attr_name);
1056 mnt_drop_write(path->mnt);
1057
1058 return err;
1059 }
1060
1061 int ksmbd_vfs_unlink(struct file *filp)
1062 {
1063 int err = 0;
1064 struct dentry *dir, *dentry = filp->f_path.dentry;
1065 struct mnt_idmap *idmap = file_mnt_idmap(filp);
1066
1067 err = mnt_want_write(filp->f_path.mnt);
1068 if (err)
1069 return err;
1070
1071 dir = dget_parent(dentry);
1072 err = ksmbd_vfs_lock_parent(dir, dentry);
1073 if (err)
1074 goto out;
1075 dget(dentry);
1076
1077 if (S_ISDIR(d_inode(dentry)->i_mode))
1078 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1079 else
1080 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1081
1082 dput(dentry);
1083 inode_unlock(d_inode(dir));
1084 if (err)
1085 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1086 out:
1087 dput(dir);
1088 mnt_drop_write(filp->f_path.mnt);
1089
1090 return err;
1091 }
1092
1093 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1094 loff_t offset, u64 ino, unsigned int d_type)
1095 {
1096 struct ksmbd_readdir_data *buf;
1097
1098 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1099 buf->dirent_count++;
1100
1101 return buf->dirent_count <= 2;
1102 }
1103
1104 /**
1105 * ksmbd_vfs_empty_dir() - check for empty directory
1106 * @fp: ksmbd file pointer
1107 *
1108 * Return: true if directory empty, otherwise false
1109 */
1110 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1111 {
1112 int err;
1113 struct ksmbd_readdir_data readdir_data;
1114
1115 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1116
1117 set_ctx_actor(&readdir_data.ctx, __dir_empty);
1118 readdir_data.dirent_count = 0;
1119
1120 err = iterate_dir(fp->filp, &readdir_data.ctx);
1121 if (readdir_data.dirent_count > 2)
1122 err = -ENOTEMPTY;
1123 else
1124 err = 0;
1125 return err;
1126 }
1127
1128 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1129 int namlen, loff_t offset, u64 ino,
1130 unsigned int d_type)
1131 {
1132 struct ksmbd_readdir_data *buf;
1133 int cmp = -EINVAL;
1134
1135 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1136
1137 if (buf->used != namlen)
1138 return true;
1139 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1140 const struct qstr q_buf = {.name = buf->private,
1141 .len = buf->used};
1142 const struct qstr q_name = {.name = name,
1143 .len = namlen};
1144
1145 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1146 }
1147 if (cmp < 0)
1148 cmp = strncasecmp((char *)buf->private, name, namlen);
1149 if (!cmp) {
1150 memcpy((char *)buf->private, name, namlen);
1151 buf->dirent_count = 1;
1152 return false;
1153 }
1154 return true;
1155 }
1156
1157 /**
1158 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1159 * @dir: path info
1160 * @name: filename to lookup
1161 * @namelen: filename length
1162 *
1163 * Return: 0 on success, otherwise error
1164 */
1165 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1166 size_t namelen, struct unicode_map *um)
1167 {
1168 int ret;
1169 struct file *dfilp;
1170 int flags = O_RDONLY | O_LARGEFILE;
1171 struct ksmbd_readdir_data readdir_data = {
1172 .ctx.actor = __caseless_lookup,
1173 .private = name,
1174 .used = namelen,
1175 .dirent_count = 0,
1176 .um = um,
1177 };
1178
1179 dfilp = dentry_open(dir, flags, current_cred());
1180 if (IS_ERR(dfilp))
1181 return PTR_ERR(dfilp);
1182
1183 ret = iterate_dir(dfilp, &readdir_data.ctx);
1184 if (readdir_data.dirent_count > 0)
1185 ret = 0;
1186 fput(dfilp);
1187 return ret;
1188 }
1189
1190 /**
1191 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1192 * @name: file path that is relative to share
1193 * @flags: lookup flags
1194 * @parent_path: if lookup succeed, return parent_path info
1195 * @path: if lookup succeed, return path info
1196 * @caseless: caseless filename lookup
1197 *
1198 * Return: 0 on success, otherwise error
1199 */
1200 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1201 unsigned int flags, struct path *parent_path,
1202 struct path *path, bool caseless)
1203 {
1204 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1205 int err;
1206
1207 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1208 path);
1209 if (!err)
1210 return 0;
1211
1212 if (caseless) {
1213 char *filepath;
1214 size_t path_len, remain_len;
1215
1216 filepath = kstrdup(name, GFP_KERNEL);
1217 if (!filepath)
1218 return -ENOMEM;
1219
1220 path_len = strlen(filepath);
1221 remain_len = path_len;
1222
1223 *parent_path = share_conf->vfs_path;
1224 path_get(parent_path);
1225
1226 while (d_can_lookup(parent_path->dentry)) {
1227 char *filename = filepath + path_len - remain_len;
1228 char *next = strchrnul(filename, '/');
1229 size_t filename_len = next - filename;
1230 bool is_last = !next[0];
1231
1232 if (filename_len == 0)
1233 break;
1234
1235 err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1236 filename_len,
1237 work->conn->um);
1238 if (err)
1239 goto out2;
1240
1241 next[0] = '\0';
1242
1243 err = vfs_path_lookup(share_conf->vfs_path.dentry,
1244 share_conf->vfs_path.mnt,
1245 filepath,
1246 flags,
1247 path);
1248 if (err)
1249 goto out2;
1250 else if (is_last)
1251 goto out1;
1252 path_put(parent_path);
1253 *parent_path = *path;
1254
1255 next[0] = '/';
1256 remain_len -= filename_len + 1;
1257 }
1258
1259 err = -EINVAL;
1260 out2:
1261 path_put(parent_path);
1262 out1:
1263 kfree(filepath);
1264 }
1265
1266 if (!err) {
1267 err = mnt_want_write(parent_path->mnt);
1268 if (err) {
1269 path_put(path);
1270 path_put(parent_path);
1271 return err;
1272 }
1273
1274 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1275 if (err) {
1276 path_put(path);
1277 path_put(parent_path);
1278 }
1279 }
1280 return err;
1281 }
1282
1283 void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1284 {
1285 inode_unlock(d_inode(parent_path->dentry));
1286 mnt_drop_write(parent_path->mnt);
1287 path_put(path);
1288 path_put(parent_path);
1289 }
1290
1291 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1292 const char *name,
1293 unsigned int flags,
1294 struct path *path)
1295 {
1296 char *abs_name;
1297 struct dentry *dent;
1298
1299 abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1300 if (!abs_name)
1301 return ERR_PTR(-ENOMEM);
1302
1303 dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1304 kfree(abs_name);
1305 return dent;
1306 }
1307
1308 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1309 const struct path *path)
1310 {
1311 char *name, *xattr_list = NULL;
1312 ssize_t xattr_list_len;
1313 int err = 0;
1314
1315 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1316 if (xattr_list_len < 0) {
1317 goto out;
1318 } else if (!xattr_list_len) {
1319 ksmbd_debug(SMB, "empty xattr in the file\n");
1320 goto out;
1321 }
1322
1323 err = mnt_want_write(path->mnt);
1324 if (err)
1325 goto out;
1326
1327 for (name = xattr_list; name - xattr_list < xattr_list_len;
1328 name += strlen(name) + 1) {
1329 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1330
1331 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1332 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1333 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1334 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1335 err = vfs_remove_acl(idmap, path->dentry, name);
1336 if (err)
1337 ksmbd_debug(SMB,
1338 "remove acl xattr failed : %s\n", name);
1339 }
1340 }
1341 mnt_drop_write(path->mnt);
1342
1343 out:
1344 kvfree(xattr_list);
1345 return err;
1346 }
1347
1348 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1349 {
1350 char *name, *xattr_list = NULL;
1351 ssize_t xattr_list_len;
1352 int err = 0;
1353
1354 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1355 if (xattr_list_len < 0) {
1356 goto out;
1357 } else if (!xattr_list_len) {
1358 ksmbd_debug(SMB, "empty xattr in the file\n");
1359 goto out;
1360 }
1361
1362 for (name = xattr_list; name - xattr_list < xattr_list_len;
1363 name += strlen(name) + 1) {
1364 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1365
1366 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1367 err = ksmbd_vfs_remove_xattr(idmap, path, name);
1368 if (err)
1369 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1370 }
1371 }
1372 out:
1373 kvfree(xattr_list);
1374 return err;
1375 }
1376
1377 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1378 struct inode *inode,
1379 int acl_type)
1380 {
1381 struct xattr_smb_acl *smb_acl = NULL;
1382 struct posix_acl *posix_acls;
1383 struct posix_acl_entry *pa_entry;
1384 struct xattr_acl_entry *xa_entry;
1385 int i;
1386
1387 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1388 return NULL;
1389
1390 posix_acls = get_inode_acl(inode, acl_type);
1391 if (IS_ERR_OR_NULL(posix_acls))
1392 return NULL;
1393
1394 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1395 sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1396 GFP_KERNEL);
1397 if (!smb_acl)
1398 goto out;
1399
1400 smb_acl->count = posix_acls->a_count;
1401 pa_entry = posix_acls->a_entries;
1402 xa_entry = smb_acl->entries;
1403 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1404 switch (pa_entry->e_tag) {
1405 case ACL_USER:
1406 xa_entry->type = SMB_ACL_USER;
1407 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1408 break;
1409 case ACL_USER_OBJ:
1410 xa_entry->type = SMB_ACL_USER_OBJ;
1411 break;
1412 case ACL_GROUP:
1413 xa_entry->type = SMB_ACL_GROUP;
1414 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1415 break;
1416 case ACL_GROUP_OBJ:
1417 xa_entry->type = SMB_ACL_GROUP_OBJ;
1418 break;
1419 case ACL_OTHER:
1420 xa_entry->type = SMB_ACL_OTHER;
1421 break;
1422 case ACL_MASK:
1423 xa_entry->type = SMB_ACL_MASK;
1424 break;
1425 default:
1426 pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1427 goto out;
1428 }
1429
1430 if (pa_entry->e_perm & ACL_READ)
1431 xa_entry->perm |= SMB_ACL_READ;
1432 if (pa_entry->e_perm & ACL_WRITE)
1433 xa_entry->perm |= SMB_ACL_WRITE;
1434 if (pa_entry->e_perm & ACL_EXECUTE)
1435 xa_entry->perm |= SMB_ACL_EXECUTE;
1436 }
1437 out:
1438 posix_acl_release(posix_acls);
1439 return smb_acl;
1440 }
1441
1442 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1443 struct mnt_idmap *idmap,
1444 const struct path *path,
1445 struct smb_ntsd *pntsd, int len,
1446 bool get_write)
1447 {
1448 int rc;
1449 struct ndr sd_ndr = {0}, acl_ndr = {0};
1450 struct xattr_ntacl acl = {0};
1451 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1452 struct dentry *dentry = path->dentry;
1453 struct inode *inode = d_inode(dentry);
1454
1455 acl.version = 4;
1456 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1457 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1458
1459 memcpy(acl.desc, "posix_acl", 9);
1460 acl.desc_len = 10;
1461
1462 pntsd->osidoffset =
1463 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1464 pntsd->gsidoffset =
1465 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1466 pntsd->dacloffset =
1467 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1468
1469 acl.sd_buf = (char *)pntsd;
1470 acl.sd_size = len;
1471
1472 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1473 if (rc) {
1474 pr_err("failed to generate hash for ndr acl\n");
1475 return rc;
1476 }
1477
1478 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1479 ACL_TYPE_ACCESS);
1480 if (S_ISDIR(inode->i_mode))
1481 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1482 ACL_TYPE_DEFAULT);
1483
1484 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1485 smb_acl, def_smb_acl);
1486 if (rc) {
1487 pr_err("failed to encode ndr to posix acl\n");
1488 goto out;
1489 }
1490
1491 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1492 acl.posix_acl_hash);
1493 if (rc) {
1494 pr_err("failed to generate hash for ndr acl\n");
1495 goto out;
1496 }
1497
1498 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1499 if (rc) {
1500 pr_err("failed to encode ndr to posix acl\n");
1501 goto out;
1502 }
1503
1504 rc = ksmbd_vfs_setxattr(idmap, path,
1505 XATTR_NAME_SD, sd_ndr.data,
1506 sd_ndr.offset, 0, get_write);
1507 if (rc < 0)
1508 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1509
1510 kfree(sd_ndr.data);
1511 out:
1512 kfree(acl_ndr.data);
1513 kfree(smb_acl);
1514 kfree(def_smb_acl);
1515 return rc;
1516 }
1517
1518 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1519 struct mnt_idmap *idmap,
1520 struct dentry *dentry,
1521 struct smb_ntsd **pntsd)
1522 {
1523 int rc;
1524 struct ndr n;
1525 struct inode *inode = d_inode(dentry);
1526 struct ndr acl_ndr = {0};
1527 struct xattr_ntacl acl;
1528 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1529 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1530
1531 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1532 if (rc <= 0)
1533 return rc;
1534
1535 n.length = rc;
1536 rc = ndr_decode_v4_ntacl(&n, &acl);
1537 if (rc)
1538 goto free_n_data;
1539
1540 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1541 ACL_TYPE_ACCESS);
1542 if (S_ISDIR(inode->i_mode))
1543 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1544 ACL_TYPE_DEFAULT);
1545
1546 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1547 def_smb_acl);
1548 if (rc) {
1549 pr_err("failed to encode ndr to posix acl\n");
1550 goto out_free;
1551 }
1552
1553 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1554 if (rc) {
1555 pr_err("failed to generate hash for ndr acl\n");
1556 goto out_free;
1557 }
1558
1559 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1560 pr_err("hash value diff\n");
1561 rc = -EINVAL;
1562 goto out_free;
1563 }
1564
1565 *pntsd = acl.sd_buf;
1566 if (acl.sd_size < sizeof(struct smb_ntsd)) {
1567 pr_err("sd size is invalid\n");
1568 goto out_free;
1569 }
1570
1571 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1572 NDR_NTSD_OFFSETOF);
1573 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1574 NDR_NTSD_OFFSETOF);
1575 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1576 NDR_NTSD_OFFSETOF);
1577
1578 rc = acl.sd_size;
1579 out_free:
1580 kfree(acl_ndr.data);
1581 kfree(smb_acl);
1582 kfree(def_smb_acl);
1583 if (rc < 0) {
1584 kfree(acl.sd_buf);
1585 *pntsd = NULL;
1586 }
1587
1588 free_n_data:
1589 kfree(n.data);
1590 return rc;
1591 }
1592
1593 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1594 const struct path *path,
1595 struct xattr_dos_attrib *da,
1596 bool get_write)
1597 {
1598 struct ndr n;
1599 int err;
1600
1601 err = ndr_encode_dos_attr(&n, da);
1602 if (err)
1603 return err;
1604
1605 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1606 (void *)n.data, n.offset, 0, get_write);
1607 if (err)
1608 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1609 kfree(n.data);
1610
1611 return err;
1612 }
1613
1614 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1615 struct dentry *dentry,
1616 struct xattr_dos_attrib *da)
1617 {
1618 struct ndr n;
1619 int err;
1620
1621 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1622 (char **)&n.data);
1623 if (err > 0) {
1624 n.length = err;
1625 if (ndr_decode_dos_attr(&n, da))
1626 err = -EINVAL;
1627 kfree(n.data);
1628 } else {
1629 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1630 }
1631
1632 return err;
1633 }
1634
1635 /**
1636 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1637 * @p: destination buffer
1638 * @ksmbd_kstat: ksmbd kstat wrapper
1639 */
1640 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1641 {
1642 struct file_directory_info *info = (struct file_directory_info *)(*p);
1643 struct kstat *kstat = ksmbd_kstat->kstat;
1644 u64 time;
1645
1646 info->FileIndex = 0;
1647 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1648 time = ksmbd_UnixTimeToNT(kstat->atime);
1649 info->LastAccessTime = cpu_to_le64(time);
1650 time = ksmbd_UnixTimeToNT(kstat->mtime);
1651 info->LastWriteTime = cpu_to_le64(time);
1652 time = ksmbd_UnixTimeToNT(kstat->ctime);
1653 info->ChangeTime = cpu_to_le64(time);
1654
1655 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1656 info->EndOfFile = 0;
1657 info->AllocationSize = 0;
1658 } else {
1659 info->EndOfFile = cpu_to_le64(kstat->size);
1660 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1661 }
1662 info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1663
1664 return info;
1665 }
1666
1667 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1668 struct mnt_idmap *idmap,
1669 struct dentry *dentry,
1670 struct ksmbd_kstat *ksmbd_kstat)
1671 {
1672 u64 time;
1673 int rc;
1674
1675 generic_fillattr(idmap, STATX_BASIC_STATS, d_inode(dentry),
1676 ksmbd_kstat->kstat);
1677
1678 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1679 ksmbd_kstat->create_time = time;
1680
1681 /*
1682 * set default value for the case that store dos attributes is not yes
1683 * or that acl is disable in server's filesystem and the config is yes.
1684 */
1685 if (S_ISDIR(ksmbd_kstat->kstat->mode))
1686 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1687 else
1688 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1689
1690 if (test_share_config_flag(work->tcon->share_conf,
1691 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1692 struct xattr_dos_attrib da;
1693
1694 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1695 if (rc > 0) {
1696 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1697 ksmbd_kstat->create_time = da.create_time;
1698 } else {
1699 ksmbd_debug(VFS, "fail to load dos attribute.\n");
1700 }
1701 }
1702
1703 return 0;
1704 }
1705
1706 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1707 struct dentry *dentry, char *attr_name,
1708 int attr_name_len)
1709 {
1710 char *name, *xattr_list = NULL;
1711 ssize_t value_len = -ENOENT, xattr_list_len;
1712
1713 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1714 if (xattr_list_len <= 0)
1715 goto out;
1716
1717 for (name = xattr_list; name - xattr_list < xattr_list_len;
1718 name += strlen(name) + 1) {
1719 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1720 if (strncasecmp(attr_name, name, attr_name_len))
1721 continue;
1722
1723 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1724 break;
1725 }
1726
1727 out:
1728 kvfree(xattr_list);
1729 return value_len;
1730 }
1731
1732 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1733 size_t *xattr_stream_name_size, int s_type)
1734 {
1735 char *type, *buf;
1736
1737 if (s_type == DIR_STREAM)
1738 type = ":$INDEX_ALLOCATION";
1739 else
1740 type = ":$DATA";
1741
1742 buf = kasprintf(GFP_KERNEL, "%s%s%s",
1743 XATTR_NAME_STREAM, stream_name, type);
1744 if (!buf)
1745 return -ENOMEM;
1746
1747 *xattr_stream_name = buf;
1748 *xattr_stream_name_size = strlen(buf) + 1;
1749
1750 return 0;
1751 }
1752
1753 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1754 struct ksmbd_file *src_fp,
1755 struct ksmbd_file *dst_fp,
1756 struct srv_copychunk *chunks,
1757 unsigned int chunk_count,
1758 unsigned int *chunk_count_written,
1759 unsigned int *chunk_size_written,
1760 loff_t *total_size_written)
1761 {
1762 unsigned int i;
1763 loff_t src_off, dst_off, src_file_size;
1764 size_t len;
1765 int ret;
1766
1767 *chunk_count_written = 0;
1768 *chunk_size_written = 0;
1769 *total_size_written = 0;
1770
1771 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1772 pr_err("no right to read(%pD)\n", src_fp->filp);
1773 return -EACCES;
1774 }
1775 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1776 pr_err("no right to write(%pD)\n", dst_fp->filp);
1777 return -EACCES;
1778 }
1779
1780 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1781 return -EBADF;
1782
1783 smb_break_all_levII_oplock(work, dst_fp, 1);
1784
1785 if (!work->tcon->posix_extensions) {
1786 for (i = 0; i < chunk_count; i++) {
1787 src_off = le64_to_cpu(chunks[i].SourceOffset);
1788 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1789 len = le32_to_cpu(chunks[i].Length);
1790
1791 if (check_lock_range(src_fp->filp, src_off,
1792 src_off + len - 1, READ))
1793 return -EAGAIN;
1794 if (check_lock_range(dst_fp->filp, dst_off,
1795 dst_off + len - 1, WRITE))
1796 return -EAGAIN;
1797 }
1798 }
1799
1800 src_file_size = i_size_read(file_inode(src_fp->filp));
1801
1802 for (i = 0; i < chunk_count; i++) {
1803 src_off = le64_to_cpu(chunks[i].SourceOffset);
1804 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1805 len = le32_to_cpu(chunks[i].Length);
1806
1807 if (src_off + len > src_file_size)
1808 return -E2BIG;
1809
1810 ret = vfs_copy_file_range(src_fp->filp, src_off,
1811 dst_fp->filp, dst_off, len, 0);
1812 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1813 ret = vfs_copy_file_range(src_fp->filp, src_off,
1814 dst_fp->filp, dst_off, len,
1815 COPY_FILE_SPLICE);
1816 if (ret < 0)
1817 return ret;
1818
1819 *chunk_count_written += 1;
1820 *total_size_written += ret;
1821 }
1822 return 0;
1823 }
1824
1825 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1826 {
1827 wait_event(flock->fl_wait, !flock->fl_blocker);
1828 }
1829
1830 int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1831 {
1832 return wait_event_interruptible_timeout(flock->fl_wait,
1833 !flock->fl_blocker,
1834 timeout);
1835 }
1836
1837 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1838 {
1839 locks_delete_block(flock);
1840 }
1841
1842 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1843 struct path *path)
1844 {
1845 struct posix_acl_state acl_state;
1846 struct posix_acl *acls;
1847 struct dentry *dentry = path->dentry;
1848 struct inode *inode = d_inode(dentry);
1849 int rc;
1850
1851 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1852 return -EOPNOTSUPP;
1853
1854 ksmbd_debug(SMB, "Set posix acls\n");
1855 rc = init_acl_state(&acl_state, 1);
1856 if (rc)
1857 return rc;
1858
1859 /* Set default owner group */
1860 acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1861 acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1862 acl_state.other.allow = inode->i_mode & 0007;
1863 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1864 acl_state.users->aces[acl_state.users->n++].perms.allow =
1865 acl_state.owner.allow;
1866 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1867 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1868 acl_state.group.allow;
1869 acl_state.mask.allow = 0x07;
1870
1871 acls = posix_acl_alloc(6, GFP_KERNEL);
1872 if (!acls) {
1873 free_acl_state(&acl_state);
1874 return -ENOMEM;
1875 }
1876 posix_state_to_acl(&acl_state, acls->a_entries);
1877
1878 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1879 if (rc < 0)
1880 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1881 rc);
1882 else if (S_ISDIR(inode->i_mode)) {
1883 posix_state_to_acl(&acl_state, acls->a_entries);
1884 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1885 if (rc < 0)
1886 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1887 rc);
1888 }
1889
1890 free_acl_state(&acl_state);
1891 posix_acl_release(acls);
1892 return rc;
1893 }
1894
1895 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1896 struct path *path, struct inode *parent_inode)
1897 {
1898 struct posix_acl *acls;
1899 struct posix_acl_entry *pace;
1900 struct dentry *dentry = path->dentry;
1901 struct inode *inode = d_inode(dentry);
1902 int rc, i;
1903
1904 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1905 return -EOPNOTSUPP;
1906
1907 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1908 if (IS_ERR_OR_NULL(acls))
1909 return -ENOENT;
1910 pace = acls->a_entries;
1911
1912 for (i = 0; i < acls->a_count; i++, pace++) {
1913 if (pace->e_tag == ACL_MASK) {
1914 pace->e_perm = 0x07;
1915 break;
1916 }
1917 }
1918
1919 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1920 if (rc < 0)
1921 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1922 rc);
1923 if (S_ISDIR(inode->i_mode)) {
1924 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1925 acls);
1926 if (rc < 0)
1927 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1928 rc);
1929 }
1930
1931 posix_acl_release(acls);
1932 return rc;
1933 }
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