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 <crypto/sha2.h>
8 #include <linux/kernel.h>
9 #include <linux/fs.h>
10 #include <linux/filelock.h>
11 #include <linux/uaccess.h>
12 #include <linux/backing-dev.h>
13 #include <linux/writeback.h>
14 #include <linux/xattr.h>
15 #include <linux/falloc.h>
16 #include <linux/fsnotify.h>
17 #include <linux/dcache.h>
18 #include <linux/slab.h>
19 #include <linux/vmalloc.h>
20 #include <linux/sched/xacct.h>
21 #include <linux/crc32c.h>
22 #include <linux/namei.h>
23 #include <linux/splice.h>
24
25 #include "glob.h"
26 #include "oplock.h"
27 #include "connection.h"
28 #include "vfs.h"
29 #include "vfs_cache.h"
30 #include "smbacl.h"
31 #include "ndr.h"
32 #include "auth.h"
33 #include "misc.h"
34
35 #include "smb_common.h"
36 #include "mgmt/share_config.h"
37 #include "mgmt/tree_connect.h"
38 #include "mgmt/user_session.h"
39 #include "mgmt/user_config.h"
40
ksmbd_vfs_inherit_owner(struct ksmbd_work * work,struct inode * parent_inode,struct inode * inode)41 static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
42 struct inode *parent_inode,
43 struct inode *inode)
44 {
45 if (!test_share_config_flag(work->tcon->share_conf,
46 KSMBD_SHARE_FLAG_INHERIT_OWNER))
47 return;
48
49 i_uid_write(inode, i_uid_read(parent_inode));
50 }
51
52 /**
53 * ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
54 * @parent: parent dentry
55 * @child: child dentry
56 *
57 * Returns: %0 on success, %-ENOENT if the parent dentry is not stable
58 */
ksmbd_vfs_lock_parent(struct dentry * parent,struct dentry * child)59 int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
60 {
61 inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
62 if (child->d_parent != parent) {
63 inode_unlock(d_inode(parent));
64 return -ENOENT;
65 }
66
67 return 0;
68 }
69
ksmbd_vfs_path_lookup(struct ksmbd_share_config * share_conf,char * pathname,unsigned int flags,struct path * path,bool do_lock)70 static int ksmbd_vfs_path_lookup(struct ksmbd_share_config *share_conf,
71 char *pathname, unsigned int flags,
72 struct path *path, bool do_lock)
73 {
74 struct qstr last;
75 struct filename *filename __free(putname) = NULL;
76 const struct path *root_share_path = &share_conf->vfs_path;
77 int err, type;
78 struct dentry *d;
79
80 if (pathname[0] == '\0') {
81 pathname = share_conf->path;
82 root_share_path = NULL;
83 } else {
84 flags |= LOOKUP_BENEATH;
85 }
86
87 filename = getname_kernel(pathname);
88 if (IS_ERR(filename))
89 return PTR_ERR(filename);
90
91 err = vfs_path_parent_lookup(filename, flags,
92 path, &last, &type,
93 root_share_path);
94 if (err)
95 return err;
96
97 if (unlikely(type != LAST_NORM)) {
98 path_put(path);
99 return -ENOENT;
100 }
101
102 if (do_lock) {
103 err = mnt_want_write(path->mnt);
104 if (err) {
105 path_put(path);
106 return -ENOENT;
107 }
108
109 inode_lock_nested(path->dentry->d_inode, I_MUTEX_PARENT);
110 d = lookup_one_qstr_excl(&last, path->dentry, 0);
111
112 if (!IS_ERR(d)) {
113 dput(path->dentry);
114 path->dentry = d;
115 return 0;
116 }
117 inode_unlock(path->dentry->d_inode);
118 mnt_drop_write(path->mnt);
119 path_put(path);
120 return -ENOENT;
121 }
122
123 d = lookup_noperm_unlocked(&last, path->dentry);
124 if (!IS_ERR(d) && d_is_negative(d)) {
125 dput(d);
126 d = ERR_PTR(-ENOENT);
127 }
128 if (IS_ERR(d)) {
129 path_put(path);
130 return -ENOENT;
131 }
132 dput(path->dentry);
133 path->dentry = d;
134
135 if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
136 err = follow_down(path, 0);
137 if (err < 0) {
138 path_put(path);
139 return -ENOENT;
140 }
141 }
142 return 0;
143 }
144
ksmbd_vfs_query_maximal_access(struct mnt_idmap * idmap,struct dentry * dentry,__le32 * daccess)145 void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
146 struct dentry *dentry, __le32 *daccess)
147 {
148 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
149
150 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
151 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
152 FILE_WRITE_DATA | FILE_APPEND_DATA |
153 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
154 FILE_DELETE_CHILD);
155
156 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
157 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
158
159 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
160 *daccess |= FILE_EXECUTE_LE;
161
162 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
163 *daccess |= FILE_DELETE_LE;
164 }
165
166 /**
167 * ksmbd_vfs_create() - vfs helper for smb create file
168 * @work: work
169 * @name: file name that is relative to share
170 * @mode: file create mode
171 *
172 * Return: 0 on success, otherwise error
173 */
ksmbd_vfs_create(struct ksmbd_work * work,const char * name,umode_t mode)174 int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
175 {
176 struct path path;
177 struct dentry *dentry;
178 int err;
179
180 dentry = ksmbd_vfs_kern_path_create(work, name,
181 LOOKUP_NO_SYMLINKS, &path);
182 if (IS_ERR(dentry)) {
183 err = PTR_ERR(dentry);
184 if (err != -ENOENT)
185 pr_err("path create failed for %s, err %d\n",
186 name, err);
187 return err;
188 }
189
190 mode |= S_IFREG;
191 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
192 dentry, mode, true);
193 if (!err) {
194 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
195 d_inode(dentry));
196 } else {
197 pr_err("File(%s): creation failed (err:%d)\n", name, err);
198 }
199
200 end_creating_path(&path, dentry);
201 return err;
202 }
203
204 /**
205 * ksmbd_vfs_mkdir() - vfs helper for smb create directory
206 * @work: work
207 * @name: directory name that is relative to share
208 * @mode: directory create mode
209 *
210 * Return: 0 on success, otherwise error
211 */
ksmbd_vfs_mkdir(struct ksmbd_work * work,const char * name,umode_t mode)212 int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
213 {
214 struct mnt_idmap *idmap;
215 struct path path;
216 struct dentry *dentry, *d;
217 int err = 0;
218
219 dentry = ksmbd_vfs_kern_path_create(work, name,
220 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
221 &path);
222 if (IS_ERR(dentry)) {
223 err = PTR_ERR(dentry);
224 if (err != -EEXIST)
225 ksmbd_debug(VFS, "path create failed for %s, err %d\n",
226 name, err);
227 return err;
228 }
229
230 idmap = mnt_idmap(path.mnt);
231 mode |= S_IFDIR;
232 d = dentry;
233 dentry = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
234 if (IS_ERR(dentry))
235 err = PTR_ERR(dentry);
236 else if (d_is_negative(dentry))
237 err = -ENOENT;
238 if (!err && dentry != d)
239 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(dentry));
240
241 end_creating_path(&path, dentry);
242 if (err)
243 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
244 return err;
245 }
246
ksmbd_vfs_getcasexattr(struct mnt_idmap * idmap,struct dentry * dentry,char * attr_name,int attr_name_len,char ** attr_value)247 static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
248 struct dentry *dentry, char *attr_name,
249 int attr_name_len, char **attr_value)
250 {
251 char *name, *xattr_list = NULL;
252 ssize_t value_len = -ENOENT, xattr_list_len;
253
254 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
255 if (xattr_list_len <= 0)
256 goto out;
257
258 for (name = xattr_list; name - xattr_list < xattr_list_len;
259 name += strlen(name) + 1) {
260 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
261 if (strncasecmp(attr_name, name, attr_name_len))
262 continue;
263
264 value_len = ksmbd_vfs_getxattr(idmap,
265 dentry,
266 name,
267 attr_value);
268 if (value_len < 0)
269 pr_err("failed to get xattr in file\n");
270 break;
271 }
272
273 out:
274 kvfree(xattr_list);
275 return value_len;
276 }
277
ksmbd_vfs_stream_read(struct ksmbd_file * fp,char * buf,loff_t * pos,size_t count)278 static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
279 size_t count)
280 {
281 ssize_t v_len;
282 char *stream_buf = NULL;
283
284 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
285 *pos, count);
286
287 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
288 fp->filp->f_path.dentry,
289 fp->stream.name,
290 fp->stream.size,
291 &stream_buf);
292 if ((int)v_len <= 0)
293 return (int)v_len;
294
295 if (v_len <= *pos) {
296 count = -EINVAL;
297 goto free_buf;
298 }
299
300 if (v_len - *pos < count)
301 count = v_len - *pos;
302 fp->stream.pos = v_len;
303
304 memcpy(buf, &stream_buf[*pos], count);
305
306 free_buf:
307 kvfree(stream_buf);
308 return count;
309 }
310
311 /**
312 * check_lock_range() - vfs helper for smb byte range file locking
313 * @filp: the file to apply the lock to
314 * @start: lock start byte offset
315 * @end: lock end byte offset
316 * @type: byte range type read/write
317 *
318 * Return: 0 on success, otherwise error
319 */
check_lock_range(struct file * filp,loff_t start,loff_t end,unsigned char type)320 static int check_lock_range(struct file *filp, loff_t start, loff_t end,
321 unsigned char type)
322 {
323 struct file_lock *flock;
324 struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
325 int error = 0;
326
327 if (!ctx || list_empty_careful(&ctx->flc_posix))
328 return 0;
329
330 spin_lock(&ctx->flc_lock);
331 for_each_file_lock(flock, &ctx->flc_posix) {
332 /* check conflict locks */
333 if (flock->fl_end >= start && end >= flock->fl_start) {
334 if (lock_is_read(flock)) {
335 if (type == WRITE) {
336 pr_err("not allow write by shared lock\n");
337 error = 1;
338 goto out;
339 }
340 } else if (lock_is_write(flock)) {
341 /* check owner in lock */
342 if (flock->c.flc_file != filp) {
343 error = 1;
344 pr_err("not allow rw access by exclusive lock from other opens\n");
345 goto out;
346 }
347 }
348 }
349 }
350 out:
351 spin_unlock(&ctx->flc_lock);
352 return error;
353 }
354
355 /**
356 * ksmbd_vfs_read() - vfs helper for smb file read
357 * @work: smb work
358 * @fp: ksmbd file pointer
359 * @count: read byte count
360 * @pos: file pos
361 * @rbuf: read data buffer
362 *
363 * Return: number of read bytes on success, otherwise error
364 */
ksmbd_vfs_read(struct ksmbd_work * work,struct ksmbd_file * fp,size_t count,loff_t * pos,char * rbuf)365 int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
366 loff_t *pos, char *rbuf)
367 {
368 struct file *filp = fp->filp;
369 ssize_t nbytes = 0;
370 struct inode *inode = file_inode(filp);
371
372 if (S_ISDIR(inode->i_mode))
373 return -EISDIR;
374
375 if (unlikely(count == 0))
376 return 0;
377
378 if (work->conn->connection_type) {
379 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
380 pr_err("no right to read(%pD)\n", fp->filp);
381 return -EACCES;
382 }
383 }
384
385 if (ksmbd_stream_fd(fp))
386 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
387
388 if (!work->tcon->posix_extensions) {
389 int ret;
390
391 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
392 if (ret) {
393 pr_err("unable to read due to lock\n");
394 return -EAGAIN;
395 }
396 }
397
398 nbytes = kernel_read(filp, rbuf, count, pos);
399 if (nbytes < 0) {
400 pr_err("smb read failed, err = %zd\n", nbytes);
401 return nbytes;
402 }
403
404 filp->f_pos = *pos;
405 return nbytes;
406 }
407
ksmbd_vfs_stream_write(struct ksmbd_file * fp,char * buf,loff_t * pos,size_t count)408 static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
409 size_t count)
410 {
411 char *stream_buf = NULL, *wbuf;
412 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
413 size_t size;
414 ssize_t v_len;
415 int err = 0;
416
417 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
418 *pos, count);
419
420 if (*pos >= XATTR_SIZE_MAX) {
421 pr_err("stream write position %lld is out of bounds\n", *pos);
422 return -EINVAL;
423 }
424
425 size = *pos + count;
426 if (size > XATTR_SIZE_MAX) {
427 size = XATTR_SIZE_MAX;
428 count = XATTR_SIZE_MAX - *pos;
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, KSMBD_DEFAULT_GFP);
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 else
467 fp->stream.pos = size;
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 * @fp: ksmbd file pointer
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 */
ksmbd_vfs_write(struct ksmbd_work * work,struct ksmbd_file * fp,char * buf,size_t count,loff_t * pos,bool sync,ssize_t * written)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 | FILE_APPEND_DATA_LE)) ||
496 S_ISDIR(file_inode(fp->filp)->i_mode)) {
497 pr_err("no right to write(%pD)\n", fp->filp);
498 err = -EACCES;
499 goto out;
500 }
501 }
502
503 filp = fp->filp;
504
505 if (ksmbd_stream_fd(fp)) {
506 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
507 if (!err)
508 *written = count;
509 goto out;
510 }
511
512 if (!work->tcon->posix_extensions) {
513 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
514 if (err) {
515 pr_err("unable to write due to lock\n");
516 err = -EAGAIN;
517 goto out;
518 }
519 }
520
521 /* Reserve lease break for parent dir at closing time */
522 fp->reserve_lease_break = true;
523
524 /* Do we need to break any of a levelII oplock? */
525 smb_break_all_levII_oplock(work, fp, 1);
526
527 err = kernel_write(filp, buf, count, pos);
528 if (err < 0) {
529 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
530 goto out;
531 }
532
533 filp->f_pos = *pos;
534 *written = err;
535 err = 0;
536 if (sync) {
537 err = vfs_fsync_range(filp, offset, offset + *written, 0);
538 if (err < 0)
539 pr_err("fsync failed for filename = %pD, err = %d\n",
540 fp->filp, err);
541 }
542
543 out:
544 return err;
545 }
546
547 /**
548 * ksmbd_vfs_getattr() - vfs helper for smb getattr
549 * @path: path of dentry
550 * @stat: pointer to returned kernel stat structure
551 * Return: 0 on success, otherwise error
552 */
ksmbd_vfs_getattr(const struct path * path,struct kstat * stat)553 int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
554 {
555 int err;
556
557 err = vfs_getattr(path, stat, STATX_BASIC_STATS | STATX_BTIME,
558 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 * @p_id: persistent file id
569 *
570 * Return: 0 on success, otherwise error
571 */
ksmbd_vfs_fsync(struct ksmbd_work * work,u64 fid,u64 p_id)572 int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
573 {
574 struct ksmbd_file *fp;
575 int err;
576
577 fp = ksmbd_lookup_fd_slow(work, fid, p_id);
578 if (!fp) {
579 pr_err("failed to get filp for fid %llu\n", fid);
580 return -ENOENT;
581 }
582 err = vfs_fsync(fp->filp, 0);
583 if (err < 0)
584 pr_err("smb fsync failed, err = %d\n", err);
585 ksmbd_fd_put(work, fp);
586 return err;
587 }
588
589 /**
590 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
591 * @work: work
592 * @path: path of dentry
593 *
594 * Return: 0 on success, otherwise error
595 */
ksmbd_vfs_remove_file(struct ksmbd_work * work,const struct path * path)596 int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
597 {
598 struct mnt_idmap *idmap;
599 struct dentry *parent = path->dentry->d_parent;
600 int err;
601
602 if (ksmbd_override_fsids(work))
603 return -ENOMEM;
604
605 if (!d_inode(path->dentry)->i_nlink) {
606 err = -ENOENT;
607 goto out_err;
608 }
609
610 idmap = mnt_idmap(path->mnt);
611 if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
612 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
613 if (err && err != -ENOTEMPTY)
614 ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
615 } else {
616 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
617 if (err)
618 ksmbd_debug(VFS, "unlink failed, err %d\n", err);
619 }
620
621 out_err:
622 ksmbd_revert_fsids(work);
623 return err;
624 }
625
626 /**
627 * ksmbd_vfs_link() - vfs helper for creating smb hardlink
628 * @work: work
629 * @oldname: source file name
630 * @newname: hardlink name that is relative to share
631 *
632 * Return: 0 on success, otherwise error
633 */
ksmbd_vfs_link(struct ksmbd_work * work,const char * oldname,const char * newname)634 int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
635 const char *newname)
636 {
637 struct path oldpath, newpath;
638 struct dentry *dentry;
639 int err;
640
641 if (ksmbd_override_fsids(work))
642 return -ENOMEM;
643
644 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
645 if (err) {
646 pr_err("cannot get linux path for %s, err = %d\n",
647 oldname, err);
648 goto out1;
649 }
650
651 dentry = ksmbd_vfs_kern_path_create(work, newname,
652 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
653 &newpath);
654 if (IS_ERR(dentry)) {
655 err = PTR_ERR(dentry);
656 pr_err("path create err for %s, err %d\n", newname, err);
657 goto out2;
658 }
659
660 err = -EXDEV;
661 if (oldpath.mnt != newpath.mnt) {
662 pr_err("vfs_link failed err %d\n", err);
663 goto out3;
664 }
665
666 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
667 d_inode(newpath.dentry),
668 dentry, NULL);
669 if (err)
670 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
671
672 out3:
673 end_creating_path(&newpath, dentry);
674 out2:
675 path_put(&oldpath);
676 out1:
677 ksmbd_revert_fsids(work);
678 return err;
679 }
680
ksmbd_vfs_rename(struct ksmbd_work * work,const struct path * old_path,char * newname,int flags)681 int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
682 char *newname, int flags)
683 {
684 struct dentry *old_parent, *new_dentry, *trap;
685 struct dentry *old_child = old_path->dentry;
686 struct path new_path;
687 struct qstr new_last;
688 struct renamedata rd;
689 struct filename *to;
690 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
691 struct ksmbd_file *parent_fp;
692 int new_type;
693 int err, lookup_flags = LOOKUP_NO_SYMLINKS;
694 int target_lookup_flags = LOOKUP_RENAME_TARGET | LOOKUP_CREATE;
695
696 if (ksmbd_override_fsids(work))
697 return -ENOMEM;
698
699 to = getname_kernel(newname);
700 if (IS_ERR(to)) {
701 err = PTR_ERR(to);
702 goto revert_fsids;
703 }
704
705 /*
706 * explicitly handle file overwrite case, for compatibility with
707 * filesystems that may not support rename flags (e.g: fuse)
708 */
709 if (flags & RENAME_NOREPLACE)
710 target_lookup_flags |= LOOKUP_EXCL;
711 flags &= ~(RENAME_NOREPLACE);
712
713 retry:
714 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
715 &new_path, &new_last, &new_type,
716 &share_conf->vfs_path);
717 if (err)
718 goto out1;
719
720 if (old_path->mnt != new_path.mnt) {
721 err = -EXDEV;
722 goto out2;
723 }
724
725 err = mnt_want_write(old_path->mnt);
726 if (err)
727 goto out2;
728
729 trap = lock_rename_child(old_child, new_path.dentry);
730 if (IS_ERR(trap)) {
731 err = PTR_ERR(trap);
732 goto out_drop_write;
733 }
734
735 old_parent = dget(old_child->d_parent);
736 if (d_unhashed(old_child)) {
737 err = -EINVAL;
738 goto out3;
739 }
740
741 parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
742 if (parent_fp) {
743 if (parent_fp->daccess & FILE_DELETE_LE) {
744 pr_err("parent dir is opened with delete access\n");
745 err = -ESHARE;
746 ksmbd_fd_put(work, parent_fp);
747 goto out3;
748 }
749 ksmbd_fd_put(work, parent_fp);
750 }
751
752 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
753 lookup_flags | target_lookup_flags);
754 if (IS_ERR(new_dentry)) {
755 err = PTR_ERR(new_dentry);
756 goto out3;
757 }
758
759 if (d_is_symlink(new_dentry)) {
760 err = -EACCES;
761 goto out4;
762 }
763
764 if (old_child == trap) {
765 err = -EINVAL;
766 goto out4;
767 }
768
769 if (new_dentry == trap) {
770 err = -ENOTEMPTY;
771 goto out4;
772 }
773
774 rd.mnt_idmap = mnt_idmap(old_path->mnt),
775 rd.old_parent = old_parent,
776 rd.old_dentry = old_child,
777 rd.new_parent = new_path.dentry,
778 rd.new_dentry = new_dentry,
779 rd.flags = flags,
780 rd.delegated_inode = NULL,
781 err = vfs_rename(&rd);
782 if (err)
783 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
784
785 out4:
786 dput(new_dentry);
787 out3:
788 dput(old_parent);
789 unlock_rename(old_parent, new_path.dentry);
790 out_drop_write:
791 mnt_drop_write(old_path->mnt);
792 out2:
793 path_put(&new_path);
794
795 if (retry_estale(err, lookup_flags)) {
796 lookup_flags |= LOOKUP_REVAL;
797 goto retry;
798 }
799 out1:
800 putname(to);
801 revert_fsids:
802 ksmbd_revert_fsids(work);
803 return err;
804 }
805
806 /**
807 * ksmbd_vfs_truncate() - vfs helper for smb file truncate
808 * @work: work
809 * @fp: ksmbd file pointer
810 * @size: truncate to given size
811 *
812 * Return: 0 on success, otherwise error
813 */
ksmbd_vfs_truncate(struct ksmbd_work * work,struct ksmbd_file * fp,loff_t size)814 int ksmbd_vfs_truncate(struct ksmbd_work *work,
815 struct ksmbd_file *fp, loff_t size)
816 {
817 int err = 0;
818 struct file *filp;
819
820 filp = fp->filp;
821
822 /* Do we need to break any of a levelII oplock? */
823 smb_break_all_levII_oplock(work, fp, 1);
824
825 if (!work->tcon->posix_extensions) {
826 struct inode *inode = file_inode(filp);
827
828 if (size < inode->i_size) {
829 err = check_lock_range(filp, size,
830 inode->i_size - 1, WRITE);
831 } else {
832 err = check_lock_range(filp, inode->i_size,
833 size - 1, WRITE);
834 }
835
836 if (err) {
837 pr_err("failed due to lock\n");
838 return -EAGAIN;
839 }
840 }
841
842 err = vfs_truncate(&filp->f_path, size);
843 if (err)
844 pr_err("truncate failed, err %d\n", err);
845 return err;
846 }
847
848 /**
849 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
850 * @dentry: dentry of file for listing xattrs
851 * @list: destination buffer
852 *
853 * Return: xattr list length on success, otherwise error
854 */
ksmbd_vfs_listxattr(struct dentry * dentry,char ** list)855 ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
856 {
857 ssize_t size;
858 char *vlist = NULL;
859
860 size = vfs_listxattr(dentry, NULL, 0);
861 if (size <= 0)
862 return size;
863
864 vlist = kvzalloc(size, KSMBD_DEFAULT_GFP);
865 if (!vlist)
866 return -ENOMEM;
867
868 *list = vlist;
869 size = vfs_listxattr(dentry, vlist, size);
870 if (size < 0) {
871 ksmbd_debug(VFS, "listxattr failed\n");
872 kvfree(vlist);
873 *list = NULL;
874 }
875
876 return size;
877 }
878
ksmbd_vfs_xattr_len(struct mnt_idmap * idmap,struct dentry * dentry,char * xattr_name)879 static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
880 struct dentry *dentry, char *xattr_name)
881 {
882 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
883 }
884
885 /**
886 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
887 * @idmap: idmap
888 * @dentry: dentry of file for getting xattrs
889 * @xattr_name: name of xattr name to query
890 * @xattr_buf: destination buffer xattr value
891 *
892 * Return: read xattr value length on success, otherwise error
893 */
ksmbd_vfs_getxattr(struct mnt_idmap * idmap,struct dentry * dentry,char * xattr_name,char ** xattr_buf)894 ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
895 struct dentry *dentry,
896 char *xattr_name, char **xattr_buf)
897 {
898 ssize_t xattr_len;
899 char *buf;
900
901 *xattr_buf = NULL;
902 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
903 if (xattr_len < 0)
904 return xattr_len;
905
906 buf = kmalloc(xattr_len + 1, KSMBD_DEFAULT_GFP);
907 if (!buf)
908 return -ENOMEM;
909
910 xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
911 (void *)buf, xattr_len);
912 if (xattr_len > 0)
913 *xattr_buf = buf;
914 else
915 kfree(buf);
916 return xattr_len;
917 }
918
919 /**
920 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
921 * @idmap: idmap of the relevant mount
922 * @path: path of dentry to set XATTR at
923 * @attr_name: xattr name for setxattr
924 * @attr_value: xattr value to set
925 * @attr_size: size of xattr value
926 * @flags: destination buffer length
927 * @get_write: get write access to a mount
928 *
929 * Return: 0 on success, otherwise error
930 */
ksmbd_vfs_setxattr(struct mnt_idmap * idmap,const struct path * path,const char * attr_name,void * attr_value,size_t attr_size,int flags,bool get_write)931 int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
932 const struct path *path, const char *attr_name,
933 void *attr_value, size_t attr_size, int flags,
934 bool get_write)
935 {
936 int err;
937
938 if (get_write == true) {
939 err = mnt_want_write(path->mnt);
940 if (err)
941 return err;
942 }
943
944 err = vfs_setxattr(idmap,
945 path->dentry,
946 attr_name,
947 attr_value,
948 attr_size,
949 flags);
950 if (err)
951 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
952 if (get_write == true)
953 mnt_drop_write(path->mnt);
954 return err;
955 }
956
957 /**
958 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
959 * @filp: file pointer for IO
960 * @option: smb IO options
961 */
ksmbd_vfs_set_fadvise(struct file * filp,__le32 option)962 void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
963 {
964 struct address_space *mapping;
965
966 mapping = filp->f_mapping;
967
968 if (!option || !mapping)
969 return;
970
971 if (option & FILE_WRITE_THROUGH_LE) {
972 filp->f_flags |= O_SYNC;
973 } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
974 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
975 spin_lock(&filp->f_lock);
976 filp->f_mode &= ~FMODE_RANDOM;
977 spin_unlock(&filp->f_lock);
978 } else if (option & FILE_RANDOM_ACCESS_LE) {
979 spin_lock(&filp->f_lock);
980 filp->f_mode |= FMODE_RANDOM;
981 spin_unlock(&filp->f_lock);
982 }
983 }
984
ksmbd_vfs_zero_data(struct ksmbd_work * work,struct ksmbd_file * fp,loff_t off,loff_t len)985 int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
986 loff_t off, loff_t len)
987 {
988 smb_break_all_levII_oplock(work, fp, 1);
989 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
990 return vfs_fallocate(fp->filp,
991 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
992 off, len);
993
994 return vfs_fallocate(fp->filp,
995 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
996 off, len);
997 }
998
ksmbd_vfs_fqar_lseek(struct ksmbd_file * fp,loff_t start,loff_t length,struct file_allocated_range_buffer * ranges,unsigned int in_count,unsigned int * out_count)999 int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
1000 struct file_allocated_range_buffer *ranges,
1001 unsigned int in_count, unsigned int *out_count)
1002 {
1003 struct file *f = fp->filp;
1004 struct inode *inode = file_inode(fp->filp);
1005 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1006 loff_t extent_start, extent_end;
1007 int ret = 0;
1008
1009 if (start > maxbytes)
1010 return -EFBIG;
1011
1012 if (!in_count)
1013 return 0;
1014
1015 /*
1016 * Shrink request scope to what the fs can actually handle.
1017 */
1018 if (length > maxbytes || (maxbytes - length) < start)
1019 length = maxbytes - start;
1020
1021 if (start + length > inode->i_size)
1022 length = inode->i_size - start;
1023
1024 *out_count = 0;
1025 end = start + length;
1026 while (start < end && *out_count < in_count) {
1027 extent_start = vfs_llseek(f, start, SEEK_DATA);
1028 if (extent_start < 0) {
1029 if (extent_start != -ENXIO)
1030 ret = (int)extent_start;
1031 break;
1032 }
1033
1034 if (extent_start >= end)
1035 break;
1036
1037 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1038 if (extent_end < 0) {
1039 if (extent_end != -ENXIO)
1040 ret = (int)extent_end;
1041 break;
1042 } else if (extent_start >= extent_end) {
1043 break;
1044 }
1045
1046 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1047 ranges[(*out_count)++].length =
1048 cpu_to_le64(min(extent_end, end) - extent_start);
1049
1050 start = extent_end;
1051 }
1052
1053 return ret;
1054 }
1055
ksmbd_vfs_remove_xattr(struct mnt_idmap * idmap,const struct path * path,char * attr_name,bool get_write)1056 int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1057 const struct path *path, char *attr_name,
1058 bool get_write)
1059 {
1060 int err;
1061
1062 if (get_write == true) {
1063 err = mnt_want_write(path->mnt);
1064 if (err)
1065 return err;
1066 }
1067
1068 err = vfs_removexattr(idmap, path->dentry, attr_name);
1069
1070 if (get_write == true)
1071 mnt_drop_write(path->mnt);
1072
1073 return err;
1074 }
1075
ksmbd_vfs_unlink(struct file * filp)1076 int ksmbd_vfs_unlink(struct file *filp)
1077 {
1078 int err = 0;
1079 struct dentry *dir, *dentry = filp->f_path.dentry;
1080 struct mnt_idmap *idmap = file_mnt_idmap(filp);
1081
1082 err = mnt_want_write(filp->f_path.mnt);
1083 if (err)
1084 return err;
1085
1086 dir = dget_parent(dentry);
1087 err = ksmbd_vfs_lock_parent(dir, dentry);
1088 if (err)
1089 goto out;
1090 dget(dentry);
1091
1092 if (S_ISDIR(d_inode(dentry)->i_mode))
1093 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1094 else
1095 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1096
1097 dput(dentry);
1098 inode_unlock(d_inode(dir));
1099 if (err)
1100 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1101 out:
1102 dput(dir);
1103 mnt_drop_write(filp->f_path.mnt);
1104
1105 return err;
1106 }
1107
__dir_empty(struct dir_context * ctx,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)1108 static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1109 loff_t offset, u64 ino, unsigned int d_type)
1110 {
1111 struct ksmbd_readdir_data *buf;
1112
1113 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1114 if (!is_dot_dotdot(name, namlen))
1115 buf->dirent_count++;
1116
1117 return !buf->dirent_count;
1118 }
1119
1120 /**
1121 * ksmbd_vfs_empty_dir() - check for empty directory
1122 * @fp: ksmbd file pointer
1123 *
1124 * Return: true if directory empty, otherwise false
1125 */
ksmbd_vfs_empty_dir(struct ksmbd_file * fp)1126 int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1127 {
1128 int err;
1129 struct ksmbd_readdir_data readdir_data;
1130
1131 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1132
1133 set_ctx_actor(&readdir_data.ctx, __dir_empty);
1134 readdir_data.dirent_count = 0;
1135
1136 err = iterate_dir(fp->filp, &readdir_data.ctx);
1137 if (readdir_data.dirent_count)
1138 err = -ENOTEMPTY;
1139 else
1140 err = 0;
1141 return err;
1142 }
1143
__caseless_lookup(struct dir_context * ctx,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)1144 static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1145 int namlen, loff_t offset, u64 ino,
1146 unsigned int d_type)
1147 {
1148 struct ksmbd_readdir_data *buf;
1149 int cmp = -EINVAL;
1150
1151 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1152
1153 if (buf->used != namlen)
1154 return true;
1155 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1156 const struct qstr q_buf = {.name = buf->private,
1157 .len = buf->used};
1158 const struct qstr q_name = {.name = name,
1159 .len = namlen};
1160
1161 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1162 }
1163 if (cmp < 0)
1164 cmp = strncasecmp((char *)buf->private, name, namlen);
1165 if (!cmp) {
1166 memcpy((char *)buf->private, name, buf->used);
1167 buf->dirent_count = 1;
1168 return false;
1169 }
1170 return true;
1171 }
1172
1173 /**
1174 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1175 * @dir: path info
1176 * @name: filename to lookup
1177 * @namelen: filename length
1178 * @um: &struct unicode_map to use
1179 *
1180 * Return: 0 on success, otherwise error
1181 */
ksmbd_vfs_lookup_in_dir(const struct path * dir,char * name,size_t namelen,struct unicode_map * um)1182 static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1183 size_t namelen, struct unicode_map *um)
1184 {
1185 int ret;
1186 struct file *dfilp;
1187 int flags = O_RDONLY | O_LARGEFILE;
1188 struct ksmbd_readdir_data readdir_data = {
1189 .ctx.actor = __caseless_lookup,
1190 .private = name,
1191 .used = namelen,
1192 .dirent_count = 0,
1193 .um = um,
1194 };
1195
1196 dfilp = dentry_open(dir, flags, current_cred());
1197 if (IS_ERR(dfilp))
1198 return PTR_ERR(dfilp);
1199
1200 ret = iterate_dir(dfilp, &readdir_data.ctx);
1201 if (readdir_data.dirent_count > 0)
1202 ret = 0;
1203 fput(dfilp);
1204 return ret;
1205 }
1206
1207 static
__ksmbd_vfs_kern_path(struct ksmbd_work * work,char * filepath,unsigned int flags,struct path * path,bool caseless,bool do_lock)1208 int __ksmbd_vfs_kern_path(struct ksmbd_work *work, char *filepath,
1209 unsigned int flags,
1210 struct path *path, bool caseless, bool do_lock)
1211 {
1212 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1213 struct path parent_path;
1214 size_t path_len, remain_len;
1215 int err;
1216
1217 retry:
1218 err = ksmbd_vfs_path_lookup(share_conf, filepath, flags, path, do_lock);
1219 if (!err || !caseless)
1220 return err;
1221
1222 path_len = strlen(filepath);
1223 remain_len = path_len;
1224
1225 parent_path = share_conf->vfs_path;
1226 path_get(&parent_path);
1227
1228 while (d_can_lookup(parent_path.dentry)) {
1229 char *filename = filepath + path_len - remain_len;
1230 char *next = strchrnul(filename, '/');
1231 size_t filename_len = next - filename;
1232 bool is_last = !next[0];
1233
1234 if (filename_len == 0)
1235 break;
1236
1237 err = ksmbd_vfs_lookup_in_dir(&parent_path, filename,
1238 filename_len,
1239 work->conn->um);
1240 path_put(&parent_path);
1241 if (err)
1242 goto out;
1243 if (is_last) {
1244 caseless = false;
1245 goto retry;
1246 }
1247 next[0] = '\0';
1248
1249 err = vfs_path_lookup(share_conf->vfs_path.dentry,
1250 share_conf->vfs_path.mnt,
1251 filepath,
1252 flags,
1253 &parent_path);
1254 next[0] = '/';
1255 if (err)
1256 goto out;
1257
1258 remain_len -= filename_len + 1;
1259 }
1260
1261 err = -EINVAL;
1262 path_put(&parent_path);
1263 out:
1264 return err;
1265 }
1266
1267 /**
1268 * ksmbd_vfs_kern_path() - lookup a file and get path info
1269 * @work: work
1270 * @filepath: file path that is relative to share
1271 * @flags: lookup flags
1272 * @path: if lookup succeed, return path info
1273 * @caseless: caseless filename lookup
1274 *
1275 * Perform the lookup, possibly crossing over any mount point.
1276 * On return no locks will be held and write-access to filesystem
1277 * won't have been checked.
1278 * Return: 0 if file was found, otherwise error
1279 */
ksmbd_vfs_kern_path(struct ksmbd_work * work,char * filepath,unsigned int flags,struct path * path,bool caseless)1280 int ksmbd_vfs_kern_path(struct ksmbd_work *work, char *filepath,
1281 unsigned int flags,
1282 struct path *path, bool caseless)
1283 {
1284 return __ksmbd_vfs_kern_path(work, filepath, flags, path,
1285 caseless, false);
1286 }
1287
1288 /**
1289 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1290 * @work: work
1291 * @filepath: file path that is relative to share
1292 * @flags: lookup flags
1293 * @path: if lookup succeed, return path info
1294 * @caseless: caseless filename lookup
1295 *
1296 * Perform the lookup, but don't cross over any mount point.
1297 * On return the parent of path->dentry will be locked and write-access to
1298 * filesystem will have been gained.
1299 * Return: 0 on if file was found, otherwise error
1300 */
ksmbd_vfs_kern_path_locked(struct ksmbd_work * work,char * filepath,unsigned int flags,struct path * path,bool caseless)1301 int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *filepath,
1302 unsigned int flags,
1303 struct path *path, bool caseless)
1304 {
1305 return __ksmbd_vfs_kern_path(work, filepath, flags, path,
1306 caseless, true);
1307 }
1308
ksmbd_vfs_kern_path_unlock(const struct path * path)1309 void ksmbd_vfs_kern_path_unlock(const struct path *path)
1310 {
1311 /* While lock is still held, ->d_parent is safe */
1312 inode_unlock(d_inode(path->dentry->d_parent));
1313 mnt_drop_write(path->mnt);
1314 path_put(path);
1315 }
1316
ksmbd_vfs_kern_path_create(struct ksmbd_work * work,const char * name,unsigned int flags,struct path * path)1317 struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1318 const char *name,
1319 unsigned int flags,
1320 struct path *path)
1321 {
1322 char *abs_name;
1323 struct dentry *dent;
1324
1325 abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1326 if (!abs_name)
1327 return ERR_PTR(-ENOMEM);
1328
1329 dent = start_creating_path(AT_FDCWD, abs_name, path, flags);
1330 kfree(abs_name);
1331 return dent;
1332 }
1333
ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap * idmap,const struct path * path)1334 int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1335 const struct path *path)
1336 {
1337 char *name, *xattr_list = NULL;
1338 ssize_t xattr_list_len;
1339 int err = 0;
1340
1341 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1342 if (xattr_list_len < 0) {
1343 goto out;
1344 } else if (!xattr_list_len) {
1345 ksmbd_debug(SMB, "empty xattr in the file\n");
1346 goto out;
1347 }
1348
1349 err = mnt_want_write(path->mnt);
1350 if (err)
1351 goto out;
1352
1353 for (name = xattr_list; name - xattr_list < xattr_list_len;
1354 name += strlen(name) + 1) {
1355 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1356
1357 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1358 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1359 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1360 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1361 err = vfs_remove_acl(idmap, path->dentry, name);
1362 if (err)
1363 ksmbd_debug(SMB,
1364 "remove acl xattr failed : %s\n", name);
1365 }
1366 }
1367 mnt_drop_write(path->mnt);
1368
1369 out:
1370 kvfree(xattr_list);
1371 return err;
1372 }
1373
ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap * idmap,const struct path * path)1374 int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1375 {
1376 char *name, *xattr_list = NULL;
1377 ssize_t xattr_list_len;
1378 int err = 0;
1379
1380 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1381 if (xattr_list_len < 0) {
1382 goto out;
1383 } else if (!xattr_list_len) {
1384 ksmbd_debug(SMB, "empty xattr in the file\n");
1385 goto out;
1386 }
1387
1388 for (name = xattr_list; name - xattr_list < xattr_list_len;
1389 name += strlen(name) + 1) {
1390 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1391
1392 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1393 err = ksmbd_vfs_remove_xattr(idmap, path, name, true);
1394 if (err)
1395 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1396 }
1397 }
1398 out:
1399 kvfree(xattr_list);
1400 return err;
1401 }
1402
ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap * idmap,struct inode * inode,int acl_type)1403 static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1404 struct inode *inode,
1405 int acl_type)
1406 {
1407 struct xattr_smb_acl *smb_acl = NULL;
1408 struct posix_acl *posix_acls;
1409 struct posix_acl_entry *pa_entry;
1410 struct xattr_acl_entry *xa_entry;
1411 int i;
1412
1413 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1414 return NULL;
1415
1416 posix_acls = get_inode_acl(inode, acl_type);
1417 if (IS_ERR_OR_NULL(posix_acls))
1418 return NULL;
1419
1420 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1421 sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1422 KSMBD_DEFAULT_GFP);
1423 if (!smb_acl)
1424 goto out;
1425
1426 smb_acl->count = posix_acls->a_count;
1427 pa_entry = posix_acls->a_entries;
1428 xa_entry = smb_acl->entries;
1429 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1430 switch (pa_entry->e_tag) {
1431 case ACL_USER:
1432 xa_entry->type = SMB_ACL_USER;
1433 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1434 break;
1435 case ACL_USER_OBJ:
1436 xa_entry->type = SMB_ACL_USER_OBJ;
1437 break;
1438 case ACL_GROUP:
1439 xa_entry->type = SMB_ACL_GROUP;
1440 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1441 break;
1442 case ACL_GROUP_OBJ:
1443 xa_entry->type = SMB_ACL_GROUP_OBJ;
1444 break;
1445 case ACL_OTHER:
1446 xa_entry->type = SMB_ACL_OTHER;
1447 break;
1448 case ACL_MASK:
1449 xa_entry->type = SMB_ACL_MASK;
1450 break;
1451 default:
1452 pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1453 goto out;
1454 }
1455
1456 if (pa_entry->e_perm & ACL_READ)
1457 xa_entry->perm |= SMB_ACL_READ;
1458 if (pa_entry->e_perm & ACL_WRITE)
1459 xa_entry->perm |= SMB_ACL_WRITE;
1460 if (pa_entry->e_perm & ACL_EXECUTE)
1461 xa_entry->perm |= SMB_ACL_EXECUTE;
1462 }
1463 out:
1464 posix_acl_release(posix_acls);
1465 return smb_acl;
1466 }
1467
ksmbd_vfs_set_sd_xattr(struct ksmbd_conn * conn,struct mnt_idmap * idmap,const struct path * path,struct smb_ntsd * pntsd,int len,bool get_write)1468 int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1469 struct mnt_idmap *idmap,
1470 const struct path *path,
1471 struct smb_ntsd *pntsd, int len,
1472 bool get_write)
1473 {
1474 int rc;
1475 struct ndr sd_ndr = {0}, acl_ndr = {0};
1476 struct xattr_ntacl acl = {0};
1477 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1478 struct dentry *dentry = path->dentry;
1479 struct inode *inode = d_inode(dentry);
1480
1481 acl.version = 4;
1482 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1483 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1484
1485 memcpy(acl.desc, "posix_acl", 9);
1486 acl.desc_len = 10;
1487
1488 pntsd->osidoffset =
1489 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1490 pntsd->gsidoffset =
1491 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1492 pntsd->dacloffset =
1493 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1494
1495 acl.sd_buf = (char *)pntsd;
1496 acl.sd_size = len;
1497
1498 sha256(acl.sd_buf, acl.sd_size, acl.hash);
1499
1500 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1501 ACL_TYPE_ACCESS);
1502 if (S_ISDIR(inode->i_mode))
1503 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1504 ACL_TYPE_DEFAULT);
1505
1506 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1507 smb_acl, def_smb_acl);
1508 if (rc) {
1509 pr_err("failed to encode ndr to posix acl\n");
1510 goto out;
1511 }
1512
1513 sha256(acl_ndr.data, acl_ndr.offset, acl.posix_acl_hash);
1514
1515 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1516 if (rc) {
1517 pr_err("failed to encode ndr to posix acl\n");
1518 goto out;
1519 }
1520
1521 rc = ksmbd_vfs_setxattr(idmap, path,
1522 XATTR_NAME_SD, sd_ndr.data,
1523 sd_ndr.offset, 0, get_write);
1524 if (rc < 0)
1525 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1526
1527 kfree(sd_ndr.data);
1528 out:
1529 kfree(acl_ndr.data);
1530 kfree(smb_acl);
1531 kfree(def_smb_acl);
1532 return rc;
1533 }
1534
ksmbd_vfs_get_sd_xattr(struct ksmbd_conn * conn,struct mnt_idmap * idmap,struct dentry * dentry,struct smb_ntsd ** pntsd)1535 int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1536 struct mnt_idmap *idmap,
1537 struct dentry *dentry,
1538 struct smb_ntsd **pntsd)
1539 {
1540 int rc;
1541 struct ndr n;
1542 struct inode *inode = d_inode(dentry);
1543 struct ndr acl_ndr = {0};
1544 struct xattr_ntacl acl;
1545 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1546 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1547
1548 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1549 if (rc <= 0)
1550 return rc;
1551
1552 n.length = rc;
1553 rc = ndr_decode_v4_ntacl(&n, &acl);
1554 if (rc)
1555 goto free_n_data;
1556
1557 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1558 ACL_TYPE_ACCESS);
1559 if (S_ISDIR(inode->i_mode))
1560 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1561 ACL_TYPE_DEFAULT);
1562
1563 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1564 def_smb_acl);
1565 if (rc) {
1566 pr_err("failed to encode ndr to posix acl\n");
1567 goto out_free;
1568 }
1569
1570 sha256(acl_ndr.data, acl_ndr.offset, cmp_hash);
1571
1572 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1573 pr_err("hash value diff\n");
1574 rc = -EINVAL;
1575 goto out_free;
1576 }
1577
1578 *pntsd = acl.sd_buf;
1579 if (acl.sd_size < sizeof(struct smb_ntsd)) {
1580 pr_err("sd size is invalid\n");
1581 goto out_free;
1582 }
1583
1584 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1585 NDR_NTSD_OFFSETOF);
1586 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1587 NDR_NTSD_OFFSETOF);
1588 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1589 NDR_NTSD_OFFSETOF);
1590
1591 rc = acl.sd_size;
1592 out_free:
1593 kfree(acl_ndr.data);
1594 kfree(smb_acl);
1595 kfree(def_smb_acl);
1596 if (rc < 0) {
1597 kfree(acl.sd_buf);
1598 *pntsd = NULL;
1599 }
1600
1601 free_n_data:
1602 kfree(n.data);
1603 return rc;
1604 }
1605
ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap * idmap,const struct path * path,struct xattr_dos_attrib * da,bool get_write)1606 int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1607 const struct path *path,
1608 struct xattr_dos_attrib *da,
1609 bool get_write)
1610 {
1611 struct ndr n;
1612 int err;
1613
1614 err = ndr_encode_dos_attr(&n, da);
1615 if (err)
1616 return err;
1617
1618 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1619 (void *)n.data, n.offset, 0, get_write);
1620 if (err)
1621 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1622 kfree(n.data);
1623
1624 return err;
1625 }
1626
ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap * idmap,struct dentry * dentry,struct xattr_dos_attrib * da)1627 int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1628 struct dentry *dentry,
1629 struct xattr_dos_attrib *da)
1630 {
1631 struct ndr n;
1632 int err;
1633
1634 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1635 (char **)&n.data);
1636 if (err > 0) {
1637 n.length = err;
1638 if (ndr_decode_dos_attr(&n, da))
1639 err = -EINVAL;
1640 kfree(n.data);
1641 } else {
1642 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1643 }
1644
1645 return err;
1646 }
1647
1648 /**
1649 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1650 * @p: destination buffer
1651 * @ksmbd_kstat: ksmbd kstat wrapper
1652 *
1653 * Returns: pointer to the converted &struct file_directory_info
1654 */
ksmbd_vfs_init_kstat(char ** p,struct ksmbd_kstat * ksmbd_kstat)1655 void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1656 {
1657 struct file_directory_info *info = (struct file_directory_info *)(*p);
1658 struct kstat *kstat = ksmbd_kstat->kstat;
1659 u64 time;
1660
1661 info->FileIndex = 0;
1662 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1663 time = ksmbd_UnixTimeToNT(kstat->atime);
1664 info->LastAccessTime = cpu_to_le64(time);
1665 time = ksmbd_UnixTimeToNT(kstat->mtime);
1666 info->LastWriteTime = cpu_to_le64(time);
1667 time = ksmbd_UnixTimeToNT(kstat->ctime);
1668 info->ChangeTime = cpu_to_le64(time);
1669
1670 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1671 info->EndOfFile = 0;
1672 info->AllocationSize = 0;
1673 } else {
1674 info->EndOfFile = cpu_to_le64(kstat->size);
1675 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1676 }
1677 info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1678
1679 return info;
1680 }
1681
ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work * work,struct mnt_idmap * idmap,struct dentry * dentry,struct ksmbd_kstat * ksmbd_kstat)1682 int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1683 struct mnt_idmap *idmap,
1684 struct dentry *dentry,
1685 struct ksmbd_kstat *ksmbd_kstat)
1686 {
1687 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1688 u64 time;
1689 int rc;
1690 struct path path = {
1691 .mnt = share_conf->vfs_path.mnt,
1692 .dentry = dentry,
1693 };
1694
1695 rc = vfs_getattr(&path, ksmbd_kstat->kstat,
1696 STATX_BASIC_STATS | STATX_BTIME,
1697 AT_STATX_SYNC_AS_STAT);
1698 if (rc)
1699 return rc;
1700
1701 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1702 ksmbd_kstat->create_time = time;
1703
1704 /*
1705 * set default value for the case that store dos attributes is not yes
1706 * or that acl is disable in server's filesystem and the config is yes.
1707 */
1708 if (S_ISDIR(ksmbd_kstat->kstat->mode))
1709 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1710 else
1711 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1712
1713 if (test_share_config_flag(work->tcon->share_conf,
1714 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1715 struct xattr_dos_attrib da;
1716
1717 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1718 if (rc > 0) {
1719 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1720 ksmbd_kstat->create_time = da.create_time;
1721 } else {
1722 ksmbd_debug(VFS, "fail to load dos attribute.\n");
1723 }
1724 }
1725
1726 return 0;
1727 }
1728
ksmbd_vfs_casexattr_len(struct mnt_idmap * idmap,struct dentry * dentry,char * attr_name,int attr_name_len)1729 ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1730 struct dentry *dentry, char *attr_name,
1731 int attr_name_len)
1732 {
1733 char *name, *xattr_list = NULL;
1734 ssize_t value_len = -ENOENT, xattr_list_len;
1735
1736 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1737 if (xattr_list_len <= 0)
1738 goto out;
1739
1740 for (name = xattr_list; name - xattr_list < xattr_list_len;
1741 name += strlen(name) + 1) {
1742 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1743 if (strncasecmp(attr_name, name, attr_name_len))
1744 continue;
1745
1746 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1747 break;
1748 }
1749
1750 out:
1751 kvfree(xattr_list);
1752 return value_len;
1753 }
1754
ksmbd_vfs_xattr_stream_name(char * stream_name,char ** xattr_stream_name,size_t * xattr_stream_name_size,int s_type)1755 int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1756 size_t *xattr_stream_name_size, int s_type)
1757 {
1758 char *type, *buf;
1759
1760 if (s_type == DIR_STREAM)
1761 type = ":$INDEX_ALLOCATION";
1762 else
1763 type = ":$DATA";
1764
1765 buf = kasprintf(KSMBD_DEFAULT_GFP, "%s%s%s",
1766 XATTR_NAME_STREAM, stream_name, type);
1767 if (!buf)
1768 return -ENOMEM;
1769
1770 *xattr_stream_name = buf;
1771 *xattr_stream_name_size = strlen(buf) + 1;
1772
1773 return 0;
1774 }
1775
ksmbd_vfs_copy_file_ranges(struct ksmbd_work * work,struct ksmbd_file * src_fp,struct ksmbd_file * dst_fp,struct srv_copychunk * chunks,unsigned int chunk_count,unsigned int * chunk_count_written,unsigned int * chunk_size_written,loff_t * total_size_written)1776 int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1777 struct ksmbd_file *src_fp,
1778 struct ksmbd_file *dst_fp,
1779 struct srv_copychunk *chunks,
1780 unsigned int chunk_count,
1781 unsigned int *chunk_count_written,
1782 unsigned int *chunk_size_written,
1783 loff_t *total_size_written)
1784 {
1785 unsigned int i;
1786 loff_t src_off, dst_off, src_file_size;
1787 size_t len;
1788 int ret;
1789
1790 *chunk_count_written = 0;
1791 *chunk_size_written = 0;
1792 *total_size_written = 0;
1793
1794 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1795 pr_err("no right to read(%pD)\n", src_fp->filp);
1796 return -EACCES;
1797 }
1798 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1799 pr_err("no right to write(%pD)\n", dst_fp->filp);
1800 return -EACCES;
1801 }
1802
1803 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1804 return -EBADF;
1805
1806 smb_break_all_levII_oplock(work, dst_fp, 1);
1807
1808 if (!work->tcon->posix_extensions) {
1809 for (i = 0; i < chunk_count; i++) {
1810 src_off = le64_to_cpu(chunks[i].SourceOffset);
1811 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1812 len = le32_to_cpu(chunks[i].Length);
1813
1814 if (check_lock_range(src_fp->filp, src_off,
1815 src_off + len - 1, READ))
1816 return -EAGAIN;
1817 if (check_lock_range(dst_fp->filp, dst_off,
1818 dst_off + len - 1, WRITE))
1819 return -EAGAIN;
1820 }
1821 }
1822
1823 src_file_size = i_size_read(file_inode(src_fp->filp));
1824
1825 for (i = 0; i < chunk_count; i++) {
1826 src_off = le64_to_cpu(chunks[i].SourceOffset);
1827 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1828 len = le32_to_cpu(chunks[i].Length);
1829
1830 if (src_off + len > src_file_size)
1831 return -E2BIG;
1832
1833 /*
1834 * vfs_copy_file_range does not allow overlapped copying
1835 * within the same file.
1836 */
1837 if (file_inode(src_fp->filp) == file_inode(dst_fp->filp) &&
1838 dst_off + len > src_off &&
1839 dst_off < src_off + len)
1840 ret = do_splice_direct(src_fp->filp, &src_off,
1841 dst_fp->filp, &dst_off,
1842 min_t(size_t, len, MAX_RW_COUNT), 0);
1843 else
1844 ret = vfs_copy_file_range(src_fp->filp, src_off,
1845 dst_fp->filp, dst_off, len, 0);
1846 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1847 ret = vfs_copy_file_range(src_fp->filp, src_off,
1848 dst_fp->filp, dst_off, len,
1849 COPY_FILE_SPLICE);
1850 if (ret < 0)
1851 return ret;
1852
1853 *chunk_count_written += 1;
1854 *total_size_written += ret;
1855 }
1856 return 0;
1857 }
1858
ksmbd_vfs_posix_lock_wait(struct file_lock * flock)1859 void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1860 {
1861 wait_event(flock->c.flc_wait, !flock->c.flc_blocker);
1862 }
1863
ksmbd_vfs_posix_lock_unblock(struct file_lock * flock)1864 void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1865 {
1866 locks_delete_block(flock);
1867 }
1868
ksmbd_vfs_set_init_posix_acl(struct mnt_idmap * idmap,const struct path * path)1869 int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1870 const struct path *path)
1871 {
1872 struct posix_acl_state acl_state;
1873 struct posix_acl *acls;
1874 struct dentry *dentry = path->dentry;
1875 struct inode *inode = d_inode(dentry);
1876 int rc;
1877
1878 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1879 return -EOPNOTSUPP;
1880
1881 ksmbd_debug(SMB, "Set posix acls\n");
1882 rc = init_acl_state(&acl_state, 1);
1883 if (rc)
1884 return rc;
1885
1886 /* Set default owner group */
1887 acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1888 acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1889 acl_state.other.allow = inode->i_mode & 0007;
1890 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1891 acl_state.users->aces[acl_state.users->n++].perms.allow =
1892 acl_state.owner.allow;
1893 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1894 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1895 acl_state.group.allow;
1896 acl_state.mask.allow = 0x07;
1897
1898 acls = posix_acl_alloc(6, KSMBD_DEFAULT_GFP);
1899 if (!acls) {
1900 free_acl_state(&acl_state);
1901 return -ENOMEM;
1902 }
1903 posix_state_to_acl(&acl_state, acls->a_entries);
1904
1905 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1906 if (rc < 0)
1907 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1908 rc);
1909 else if (S_ISDIR(inode->i_mode)) {
1910 posix_state_to_acl(&acl_state, acls->a_entries);
1911 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1912 if (rc < 0)
1913 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1914 rc);
1915 }
1916
1917 free_acl_state(&acl_state);
1918 posix_acl_release(acls);
1919 return rc;
1920 }
1921
ksmbd_vfs_inherit_posix_acl(struct mnt_idmap * idmap,const struct path * path,struct inode * parent_inode)1922 int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1923 const struct path *path, struct inode *parent_inode)
1924 {
1925 struct posix_acl *acls;
1926 struct posix_acl_entry *pace;
1927 struct dentry *dentry = path->dentry;
1928 struct inode *inode = d_inode(dentry);
1929 int rc, i;
1930
1931 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1932 return -EOPNOTSUPP;
1933
1934 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1935 if (IS_ERR_OR_NULL(acls))
1936 return -ENOENT;
1937 pace = acls->a_entries;
1938
1939 for (i = 0; i < acls->a_count; i++, pace++) {
1940 if (pace->e_tag == ACL_MASK) {
1941 pace->e_perm = 0x07;
1942 break;
1943 }
1944 }
1945
1946 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1947 if (rc < 0)
1948 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1949 rc);
1950 if (S_ISDIR(inode->i_mode)) {
1951 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1952 acls);
1953 if (rc < 0)
1954 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1955 rc);
1956 }
1957
1958 posix_acl_release(acls);
1959 return rc;
1960 }
1961