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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
39static 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 * @parent: parent dentry
53 * @child: child dentry
54 *
55 * Returns: %0 on success, %-ENOENT if the parent dentry is not stable
56 */
57int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
58{
59 inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
60 if (child->d_parent != parent) {
61 inode_unlock(d_inode(parent));
62 return -ENOENT;
63 }
64
65 return 0;
66}
67
68static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
69 char *pathname, unsigned int flags,
70 struct path *parent_path,
71 struct path *path)
72{
73 struct qstr last;
74 struct filename *filename;
75 struct path *root_share_path = &share_conf->vfs_path;
76 int err, type;
77 struct dentry *d;
78
79 if (pathname[0] == '\0') {
80 pathname = share_conf->path;
81 root_share_path = NULL;
82 } else {
83 flags |= LOOKUP_BENEATH;
84 }
85
86 filename = getname_kernel(pathname);
87 if (IS_ERR(filename))
88 return PTR_ERR(filename);
89
90 err = vfs_path_parent_lookup(filename, flags,
91 parent_path, &last, &type,
92 root_share_path);
93 if (err) {
94 putname(filename);
95 return err;
96 }
97
98 if (unlikely(type != LAST_NORM)) {
99 path_put(parent_path);
100 putname(filename);
101 return -ENOENT;
102 }
103
104 err = mnt_want_write(parent_path->mnt);
105 if (err) {
106 path_put(parent_path);
107 putname(filename);
108 return -ENOENT;
109 }
110
111 inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
112 d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
113 if (IS_ERR(d))
114 goto err_out;
115
116 if (d_is_negative(d)) {
117 dput(d);
118 goto err_out;
119 }
120
121 path->dentry = d;
122 path->mnt = mntget(parent_path->mnt);
123
124 if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
125 err = follow_down(path, 0);
126 if (err < 0) {
127 path_put(path);
128 goto err_out;
129 }
130 }
131
132 putname(filename);
133 return 0;
134
135err_out:
136 inode_unlock(d_inode(parent_path->dentry));
137 mnt_drop_write(parent_path->mnt);
138 path_put(parent_path);
139 putname(filename);
140 return -ENOENT;
141}
142
143void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
144 struct dentry *dentry, __le32 *daccess)
145{
146 *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
147
148 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
149 *daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
150 FILE_WRITE_DATA | FILE_APPEND_DATA |
151 FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
152 FILE_DELETE_CHILD);
153
154 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
155 *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
156
157 if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
158 *daccess |= FILE_EXECUTE_LE;
159
160 if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
161 *daccess |= FILE_DELETE_LE;
162}
163
164/**
165 * ksmbd_vfs_create() - vfs helper for smb create file
166 * @work: work
167 * @name: file name that is relative to share
168 * @mode: file create mode
169 *
170 * Return: 0 on success, otherwise error
171 */
172int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
173{
174 struct path path;
175 struct dentry *dentry;
176 int err;
177
178 dentry = ksmbd_vfs_kern_path_create(work, name,
179 LOOKUP_NO_SYMLINKS, &path);
180 if (IS_ERR(dentry)) {
181 err = PTR_ERR(dentry);
182 if (err != -ENOENT)
183 pr_err("path create failed for %s, err %d\n",
184 name, err);
185 return err;
186 }
187
188 mode |= S_IFREG;
189 err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
190 dentry, mode, true);
191 if (!err) {
192 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
193 d_inode(dentry));
194 } else {
195 pr_err("File(%s): creation failed (err:%d)\n", name, err);
196 }
197
198 done_path_create(&path, dentry);
199 return err;
200}
201
202/**
203 * ksmbd_vfs_mkdir() - vfs helper for smb create directory
204 * @work: work
205 * @name: directory name that is relative to share
206 * @mode: directory create mode
207 *
208 * Return: 0 on success, otherwise error
209 */
210int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
211{
212 struct mnt_idmap *idmap;
213 struct path path;
214 struct dentry *dentry;
215 int err;
216
217 dentry = ksmbd_vfs_kern_path_create(work, name,
218 LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
219 &path);
220 if (IS_ERR(dentry)) {
221 err = PTR_ERR(dentry);
222 if (err != -EEXIST)
223 ksmbd_debug(VFS, "path create failed for %s, err %d\n",
224 name, err);
225 return err;
226 }
227
228 idmap = mnt_idmap(path.mnt);
229 mode |= S_IFDIR;
230 err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
231 if (!err && d_unhashed(dentry)) {
232 struct dentry *d;
233
234 d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
235 dentry->d_name.len);
236 if (IS_ERR(d)) {
237 err = PTR_ERR(d);
238 goto out_err;
239 }
240 if (unlikely(d_is_negative(d))) {
241 dput(d);
242 err = -ENOENT;
243 goto out_err;
244 }
245
246 ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
247 dput(d);
248 }
249
250out_err:
251 done_path_create(&path, dentry);
252 if (err)
253 pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
254 return err;
255}
256
257static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
258 struct dentry *dentry, char *attr_name,
259 int attr_name_len, char **attr_value)
260{
261 char *name, *xattr_list = NULL;
262 ssize_t value_len = -ENOENT, xattr_list_len;
263
264 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
265 if (xattr_list_len <= 0)
266 goto out;
267
268 for (name = xattr_list; name - xattr_list < xattr_list_len;
269 name += strlen(name) + 1) {
270 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
271 if (strncasecmp(attr_name, name, attr_name_len))
272 continue;
273
274 value_len = ksmbd_vfs_getxattr(idmap,
275 dentry,
276 name,
277 attr_value);
278 if (value_len < 0)
279 pr_err("failed to get xattr in file\n");
280 break;
281 }
282
283out:
284 kvfree(xattr_list);
285 return value_len;
286}
287
288static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
289 size_t count)
290{
291 ssize_t v_len;
292 char *stream_buf = NULL;
293
294 ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
295 *pos, count);
296
297 v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
298 fp->filp->f_path.dentry,
299 fp->stream.name,
300 fp->stream.size,
301 &stream_buf);
302 if ((int)v_len <= 0)
303 return (int)v_len;
304
305 if (v_len <= *pos) {
306 count = -EINVAL;
307 goto free_buf;
308 }
309
310 if (v_len - *pos < count)
311 count = v_len - *pos;
312
313 memcpy(buf, &stream_buf[*pos], count);
314
315free_buf:
316 kvfree(stream_buf);
317 return count;
318}
319
320/**
321 * check_lock_range() - vfs helper for smb byte range file locking
322 * @filp: the file to apply the lock to
323 * @start: lock start byte offset
324 * @end: lock end byte offset
325 * @type: byte range type read/write
326 *
327 * Return: 0 on success, otherwise error
328 */
329static int check_lock_range(struct file *filp, loff_t start, loff_t end,
330 unsigned char type)
331{
332 struct file_lock *flock;
333 struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
334 int error = 0;
335
336 if (!ctx || list_empty_careful(&ctx->flc_posix))
337 return 0;
338
339 spin_lock(&ctx->flc_lock);
340 list_for_each_entry(flock, &ctx->flc_posix, fl_list) {
341 /* check conflict locks */
342 if (flock->fl_end >= start && end >= flock->fl_start) {
343 if (flock->fl_type == F_RDLCK) {
344 if (type == WRITE) {
345 pr_err("not allow write by shared lock\n");
346 error = 1;
347 goto out;
348 }
349 } else if (flock->fl_type == F_WRLCK) {
350 /* check owner in lock */
351 if (flock->fl_file != filp) {
352 error = 1;
353 pr_err("not allow rw access by exclusive lock from other opens\n");
354 goto out;
355 }
356 }
357 }
358 }
359out:
360 spin_unlock(&ctx->flc_lock);
361 return error;
362}
363
364/**
365 * ksmbd_vfs_read() - vfs helper for smb file read
366 * @work: smb work
367 * @fp: ksmbd file pointer
368 * @count: read byte count
369 * @pos: file pos
370 * @rbuf: read data buffer
371 *
372 * Return: number of read bytes on success, otherwise error
373 */
374int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
375 loff_t *pos, char *rbuf)
376{
377 struct file *filp = fp->filp;
378 ssize_t nbytes = 0;
379 struct inode *inode = file_inode(filp);
380
381 if (S_ISDIR(inode->i_mode))
382 return -EISDIR;
383
384 if (unlikely(count == 0))
385 return 0;
386
387 if (work->conn->connection_type) {
388 if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
389 pr_err("no right to read(%pD)\n", fp->filp);
390 return -EACCES;
391 }
392 }
393
394 if (ksmbd_stream_fd(fp))
395 return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
396
397 if (!work->tcon->posix_extensions) {
398 int ret;
399
400 ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
401 if (ret) {
402 pr_err("unable to read due to lock\n");
403 return -EAGAIN;
404 }
405 }
406
407 nbytes = kernel_read(filp, rbuf, count, pos);
408 if (nbytes < 0) {
409 pr_err("smb read failed, err = %zd\n", nbytes);
410 return nbytes;
411 }
412
413 filp->f_pos = *pos;
414 return nbytes;
415}
416
417static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
418 size_t count)
419{
420 char *stream_buf = NULL, *wbuf;
421 struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
422 size_t size;
423 ssize_t v_len;
424 int err = 0;
425
426 ksmbd_debug(VFS, "write stream data pos : %llu, count : %zd\n",
427 *pos, count);
428
429 size = *pos + count;
430 if (size > XATTR_SIZE_MAX) {
431 size = XATTR_SIZE_MAX;
432 count = (*pos + count) - XATTR_SIZE_MAX;
433 }
434
435 v_len = ksmbd_vfs_getcasexattr(idmap,
436 fp->filp->f_path.dentry,
437 fp->stream.name,
438 fp->stream.size,
439 &stream_buf);
440 if (v_len < 0) {
441 pr_err("not found stream in xattr : %zd\n", v_len);
442 err = v_len;
443 goto out;
444 }
445
446 if (v_len < size) {
447 wbuf = kvzalloc(size, GFP_KERNEL);
448 if (!wbuf) {
449 err = -ENOMEM;
450 goto out;
451 }
452
453 if (v_len > 0)
454 memcpy(wbuf, stream_buf, v_len);
455 kvfree(stream_buf);
456 stream_buf = wbuf;
457 }
458
459 memcpy(&stream_buf[*pos], buf, count);
460
461 err = ksmbd_vfs_setxattr(idmap,
462 &fp->filp->f_path,
463 fp->stream.name,
464 (void *)stream_buf,
465 size,
466 0,
467 true);
468 if (err < 0)
469 goto out;
470
471 fp->filp->f_pos = *pos;
472 err = 0;
473out:
474 kvfree(stream_buf);
475 return err;
476}
477
478/**
479 * ksmbd_vfs_write() - vfs helper for smb file write
480 * @work: work
481 * @fp: ksmbd file pointer
482 * @buf: buf containing data for writing
483 * @count: read byte count
484 * @pos: file pos
485 * @sync: fsync after write
486 * @written: number of bytes written
487 *
488 * Return: 0 on success, otherwise error
489 */
490int ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
491 char *buf, size_t count, loff_t *pos, bool sync,
492 ssize_t *written)
493{
494 struct file *filp;
495 loff_t offset = *pos;
496 int err = 0;
497
498 if (work->conn->connection_type) {
499 if (!(fp->daccess & FILE_WRITE_DATA_LE)) {
500 pr_err("no right to write(%pD)\n", fp->filp);
501 err = -EACCES;
502 goto out;
503 }
504 }
505
506 filp = fp->filp;
507
508 if (ksmbd_stream_fd(fp)) {
509 err = ksmbd_vfs_stream_write(fp, buf, pos, count);
510 if (!err)
511 *written = count;
512 goto out;
513 }
514
515 if (!work->tcon->posix_extensions) {
516 err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
517 if (err) {
518 pr_err("unable to write due to lock\n");
519 err = -EAGAIN;
520 goto out;
521 }
522 }
523
524 /* Reserve lease break for parent dir at closing time */
525 fp->reserve_lease_break = true;
526
527 /* Do we need to break any of a levelII oplock? */
528 smb_break_all_levII_oplock(work, fp, 1);
529
530 err = kernel_write(filp, buf, count, pos);
531 if (err < 0) {
532 ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
533 goto out;
534 }
535
536 filp->f_pos = *pos;
537 *written = err;
538 err = 0;
539 if (sync) {
540 err = vfs_fsync_range(filp, offset, offset + *written, 0);
541 if (err < 0)
542 pr_err("fsync failed for filename = %pD, err = %d\n",
543 fp->filp, err);
544 }
545
546out:
547 return err;
548}
549
550/**
551 * ksmbd_vfs_getattr() - vfs helper for smb getattr
552 * @path: path of dentry
553 * @stat: pointer to returned kernel stat structure
554 * Return: 0 on success, otherwise error
555 */
556int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
557{
558 int err;
559
560 err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
561 if (err)
562 pr_err("getattr failed, err %d\n", err);
563 return err;
564}
565
566/**
567 * ksmbd_vfs_fsync() - vfs helper for smb fsync
568 * @work: work
569 * @fid: file id of open file
570 * @p_id: persistent file id
571 *
572 * Return: 0 on success, otherwise error
573 */
574int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
575{
576 struct ksmbd_file *fp;
577 int err;
578
579 fp = ksmbd_lookup_fd_slow(work, fid, p_id);
580 if (!fp) {
581 pr_err("failed to get filp for fid %llu\n", fid);
582 return -ENOENT;
583 }
584 err = vfs_fsync(fp->filp, 0);
585 if (err < 0)
586 pr_err("smb fsync failed, err = %d\n", err);
587 ksmbd_fd_put(work, fp);
588 return err;
589}
590
591/**
592 * ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
593 * @work: work
594 * @path: path of dentry
595 *
596 * Return: 0 on success, otherwise error
597 */
598int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
599{
600 struct mnt_idmap *idmap;
601 struct dentry *parent = path->dentry->d_parent;
602 int err;
603
604 if (ksmbd_override_fsids(work))
605 return -ENOMEM;
606
607 if (!d_inode(path->dentry)->i_nlink) {
608 err = -ENOENT;
609 goto out_err;
610 }
611
612 idmap = mnt_idmap(path->mnt);
613 if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
614 err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
615 if (err && err != -ENOTEMPTY)
616 ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
617 } else {
618 err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
619 if (err)
620 ksmbd_debug(VFS, "unlink failed, err %d\n", err);
621 }
622
623out_err:
624 ksmbd_revert_fsids(work);
625 return err;
626}
627
628/**
629 * ksmbd_vfs_link() - vfs helper for creating smb hardlink
630 * @work: work
631 * @oldname: source file name
632 * @newname: hardlink name that is relative to share
633 *
634 * Return: 0 on success, otherwise error
635 */
636int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
637 const char *newname)
638{
639 struct path oldpath, newpath;
640 struct dentry *dentry;
641 int err;
642
643 if (ksmbd_override_fsids(work))
644 return -ENOMEM;
645
646 err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
647 if (err) {
648 pr_err("cannot get linux path for %s, err = %d\n",
649 oldname, err);
650 goto out1;
651 }
652
653 dentry = ksmbd_vfs_kern_path_create(work, newname,
654 LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
655 &newpath);
656 if (IS_ERR(dentry)) {
657 err = PTR_ERR(dentry);
658 pr_err("path create err for %s, err %d\n", newname, err);
659 goto out2;
660 }
661
662 err = -EXDEV;
663 if (oldpath.mnt != newpath.mnt) {
664 pr_err("vfs_link failed err %d\n", err);
665 goto out3;
666 }
667
668 err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
669 d_inode(newpath.dentry),
670 dentry, NULL);
671 if (err)
672 ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
673
674out3:
675 done_path_create(&newpath, dentry);
676out2:
677 path_put(&oldpath);
678out1:
679 ksmbd_revert_fsids(work);
680 return err;
681}
682
683int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
684 char *newname, int flags)
685{
686 struct dentry *old_parent, *new_dentry, *trap;
687 struct dentry *old_child = old_path->dentry;
688 struct path new_path;
689 struct qstr new_last;
690 struct renamedata rd;
691 struct filename *to;
692 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
693 struct ksmbd_file *parent_fp;
694 int new_type;
695 int err, lookup_flags = LOOKUP_NO_SYMLINKS;
696
697 if (ksmbd_override_fsids(work))
698 return -ENOMEM;
699
700 to = getname_kernel(newname);
701 if (IS_ERR(to)) {
702 err = PTR_ERR(to);
703 goto revert_fsids;
704 }
705
706retry:
707 err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
708 &new_path, &new_last, &new_type,
709 &share_conf->vfs_path);
710 if (err)
711 goto out1;
712
713 if (old_path->mnt != new_path.mnt) {
714 err = -EXDEV;
715 goto out2;
716 }
717
718 err = mnt_want_write(old_path->mnt);
719 if (err)
720 goto out2;
721
722 trap = lock_rename_child(old_child, new_path.dentry);
723 if (IS_ERR(trap)) {
724 err = PTR_ERR(trap);
725 goto out_drop_write;
726 }
727
728 old_parent = dget(old_child->d_parent);
729 if (d_unhashed(old_child)) {
730 err = -EINVAL;
731 goto out3;
732 }
733
734 parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
735 if (parent_fp) {
736 if (parent_fp->daccess & FILE_DELETE_LE) {
737 pr_err("parent dir is opened with delete access\n");
738 err = -ESHARE;
739 ksmbd_fd_put(work, parent_fp);
740 goto out3;
741 }
742 ksmbd_fd_put(work, parent_fp);
743 }
744
745 new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
746 lookup_flags | LOOKUP_RENAME_TARGET);
747 if (IS_ERR(new_dentry)) {
748 err = PTR_ERR(new_dentry);
749 goto out3;
750 }
751
752 if (d_is_symlink(new_dentry)) {
753 err = -EACCES;
754 goto out4;
755 }
756
757 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
758 err = -EEXIST;
759 goto out4;
760 }
761
762 if (old_child == trap) {
763 err = -EINVAL;
764 goto out4;
765 }
766
767 if (new_dentry == trap) {
768 err = -ENOTEMPTY;
769 goto out4;
770 }
771
772 rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
773 rd.old_dir = d_inode(old_parent),
774 rd.old_dentry = old_child,
775 rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
776 rd.new_dir = new_path.dentry->d_inode,
777 rd.new_dentry = new_dentry,
778 rd.flags = flags,
779 rd.delegated_inode = NULL,
780 err = vfs_rename(&rd);
781 if (err)
782 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
783
784out4:
785 dput(new_dentry);
786out3:
787 dput(old_parent);
788 unlock_rename(old_parent, new_path.dentry);
789out_drop_write:
790 mnt_drop_write(old_path->mnt);
791out2:
792 path_put(&new_path);
793
794 if (retry_estale(err, lookup_flags)) {
795 lookup_flags |= LOOKUP_REVAL;
796 goto retry;
797 }
798out1:
799 putname(to);
800revert_fsids:
801 ksmbd_revert_fsids(work);
802 return err;
803}
804
805/**
806 * ksmbd_vfs_truncate() - vfs helper for smb file truncate
807 * @work: work
808 * @fp: ksmbd file pointer
809 * @size: truncate to given size
810 *
811 * Return: 0 on success, otherwise error
812 */
813int ksmbd_vfs_truncate(struct ksmbd_work *work,
814 struct ksmbd_file *fp, loff_t size)
815{
816 int err = 0;
817 struct file *filp;
818
819 filp = fp->filp;
820
821 /* Do we need to break any of a levelII oplock? */
822 smb_break_all_levII_oplock(work, fp, 1);
823
824 if (!work->tcon->posix_extensions) {
825 struct inode *inode = file_inode(filp);
826
827 if (size < inode->i_size) {
828 err = check_lock_range(filp, size,
829 inode->i_size - 1, WRITE);
830 } else {
831 err = check_lock_range(filp, inode->i_size,
832 size - 1, WRITE);
833 }
834
835 if (err) {
836 pr_err("failed due to lock\n");
837 return -EAGAIN;
838 }
839 }
840
841 err = vfs_truncate(&filp->f_path, size);
842 if (err)
843 pr_err("truncate failed, err %d\n", err);
844 return err;
845}
846
847/**
848 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
849 * @dentry: dentry of file for listing xattrs
850 * @list: destination buffer
851 *
852 * Return: xattr list length on success, otherwise error
853 */
854ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
855{
856 ssize_t size;
857 char *vlist = NULL;
858
859 size = vfs_listxattr(dentry, NULL, 0);
860 if (size <= 0)
861 return size;
862
863 vlist = kvzalloc(size, GFP_KERNEL);
864 if (!vlist)
865 return -ENOMEM;
866
867 *list = vlist;
868 size = vfs_listxattr(dentry, vlist, size);
869 if (size < 0) {
870 ksmbd_debug(VFS, "listxattr failed\n");
871 kvfree(vlist);
872 *list = NULL;
873 }
874
875 return size;
876}
877
878static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
879 struct dentry *dentry, char *xattr_name)
880{
881 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
882}
883
884/**
885 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
886 * @idmap: idmap
887 * @dentry: dentry of file for getting xattrs
888 * @xattr_name: name of xattr name to query
889 * @xattr_buf: destination buffer xattr value
890 *
891 * Return: read xattr value length on success, otherwise error
892 */
893ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
894 struct dentry *dentry,
895 char *xattr_name, char **xattr_buf)
896{
897 ssize_t xattr_len;
898 char *buf;
899
900 *xattr_buf = NULL;
901 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
902 if (xattr_len < 0)
903 return xattr_len;
904
905 buf = kmalloc(xattr_len + 1, GFP_KERNEL);
906 if (!buf)
907 return -ENOMEM;
908
909 xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
910 (void *)buf, xattr_len);
911 if (xattr_len > 0)
912 *xattr_buf = buf;
913 else
914 kfree(buf);
915 return xattr_len;
916}
917
918/**
919 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
920 * @idmap: idmap of the relevant mount
921 * @path: path of dentry to set XATTR at
922 * @attr_name: xattr name for setxattr
923 * @attr_value: xattr value to set
924 * @attr_size: size of xattr value
925 * @flags: destination buffer length
926 * @get_write: get write access to a mount
927 *
928 * Return: 0 on success, otherwise error
929 */
930int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
931 const struct path *path, const char *attr_name,
932 void *attr_value, size_t attr_size, int flags,
933 bool get_write)
934{
935 int err;
936
937 if (get_write == true) {
938 err = mnt_want_write(path->mnt);
939 if (err)
940 return err;
941 }
942
943 err = vfs_setxattr(idmap,
944 path->dentry,
945 attr_name,
946 attr_value,
947 attr_size,
948 flags);
949 if (err)
950 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
951 if (get_write == true)
952 mnt_drop_write(path->mnt);
953 return err;
954}
955
956/**
957 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
958 * @filp: file pointer for IO
959 * @option: smb IO options
960 */
961void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
962{
963 struct address_space *mapping;
964
965 mapping = filp->f_mapping;
966
967 if (!option || !mapping)
968 return;
969
970 if (option & FILE_WRITE_THROUGH_LE) {
971 filp->f_flags |= O_SYNC;
972 } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
973 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
974 spin_lock(&filp->f_lock);
975 filp->f_mode &= ~FMODE_RANDOM;
976 spin_unlock(&filp->f_lock);
977 } else if (option & FILE_RANDOM_ACCESS_LE) {
978 spin_lock(&filp->f_lock);
979 filp->f_mode |= FMODE_RANDOM;
980 spin_unlock(&filp->f_lock);
981 }
982}
983
984int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
985 loff_t off, loff_t len)
986{
987 smb_break_all_levII_oplock(work, fp, 1);
988 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
989 return vfs_fallocate(fp->filp,
990 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
991 off, len);
992
993 return vfs_fallocate(fp->filp,
994 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
995 off, len);
996}
997
998int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
999 struct file_allocated_range_buffer *ranges,
1000 unsigned int in_count, unsigned int *out_count)
1001{
1002 struct file *f = fp->filp;
1003 struct inode *inode = file_inode(fp->filp);
1004 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1005 loff_t extent_start, extent_end;
1006 int ret = 0;
1007
1008 if (start > maxbytes)
1009 return -EFBIG;
1010
1011 if (!in_count)
1012 return 0;
1013
1014 /*
1015 * Shrink request scope to what the fs can actually handle.
1016 */
1017 if (length > maxbytes || (maxbytes - length) < start)
1018 length = maxbytes - start;
1019
1020 if (start + length > inode->i_size)
1021 length = inode->i_size - start;
1022
1023 *out_count = 0;
1024 end = start + length;
1025 while (start < end && *out_count < in_count) {
1026 extent_start = vfs_llseek(f, start, SEEK_DATA);
1027 if (extent_start < 0) {
1028 if (extent_start != -ENXIO)
1029 ret = (int)extent_start;
1030 break;
1031 }
1032
1033 if (extent_start >= end)
1034 break;
1035
1036 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1037 if (extent_end < 0) {
1038 if (extent_end != -ENXIO)
1039 ret = (int)extent_end;
1040 break;
1041 } else if (extent_start >= extent_end) {
1042 break;
1043 }
1044
1045 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1046 ranges[(*out_count)++].length =
1047 cpu_to_le64(min(extent_end, end) - extent_start);
1048
1049 start = extent_end;
1050 }
1051
1052 return ret;
1053}
1054
1055int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1056 const struct path *path, char *attr_name)
1057{
1058 int err;
1059
1060 err = mnt_want_write(path->mnt);
1061 if (err)
1062 return err;
1063
1064 err = vfs_removexattr(idmap, path->dentry, attr_name);
1065 mnt_drop_write(path->mnt);
1066
1067 return err;
1068}
1069
1070int ksmbd_vfs_unlink(struct file *filp)
1071{
1072 int err = 0;
1073 struct dentry *dir, *dentry = filp->f_path.dentry;
1074 struct mnt_idmap *idmap = file_mnt_idmap(filp);
1075
1076 err = mnt_want_write(filp->f_path.mnt);
1077 if (err)
1078 return err;
1079
1080 dir = dget_parent(dentry);
1081 err = ksmbd_vfs_lock_parent(dir, dentry);
1082 if (err)
1083 goto out;
1084 dget(dentry);
1085
1086 if (S_ISDIR(d_inode(dentry)->i_mode))
1087 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1088 else
1089 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1090
1091 dput(dentry);
1092 inode_unlock(d_inode(dir));
1093 if (err)
1094 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1095out:
1096 dput(dir);
1097 mnt_drop_write(filp->f_path.mnt);
1098
1099 return err;
1100}
1101
1102static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1103 loff_t offset, u64 ino, unsigned int d_type)
1104{
1105 struct ksmbd_readdir_data *buf;
1106
1107 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1108 buf->dirent_count++;
1109
1110 return buf->dirent_count <= 2;
1111}
1112
1113/**
1114 * ksmbd_vfs_empty_dir() - check for empty directory
1115 * @fp: ksmbd file pointer
1116 *
1117 * Return: true if directory empty, otherwise false
1118 */
1119int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1120{
1121 int err;
1122 struct ksmbd_readdir_data readdir_data;
1123
1124 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1125
1126 set_ctx_actor(&readdir_data.ctx, __dir_empty);
1127 readdir_data.dirent_count = 0;
1128
1129 err = iterate_dir(fp->filp, &readdir_data.ctx);
1130 if (readdir_data.dirent_count > 2)
1131 err = -ENOTEMPTY;
1132 else
1133 err = 0;
1134 return err;
1135}
1136
1137static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1138 int namlen, loff_t offset, u64 ino,
1139 unsigned int d_type)
1140{
1141 struct ksmbd_readdir_data *buf;
1142 int cmp = -EINVAL;
1143
1144 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1145
1146 if (buf->used != namlen)
1147 return true;
1148 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1149 const struct qstr q_buf = {.name = buf->private,
1150 .len = buf->used};
1151 const struct qstr q_name = {.name = name,
1152 .len = namlen};
1153
1154 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1155 }
1156 if (cmp < 0)
1157 cmp = strncasecmp((char *)buf->private, name, namlen);
1158 if (!cmp) {
1159 memcpy((char *)buf->private, name, namlen);
1160 buf->dirent_count = 1;
1161 return false;
1162 }
1163 return true;
1164}
1165
1166/**
1167 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1168 * @dir: path info
1169 * @name: filename to lookup
1170 * @namelen: filename length
1171 * @um: &struct unicode_map to use
1172 *
1173 * Return: 0 on success, otherwise error
1174 */
1175static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1176 size_t namelen, struct unicode_map *um)
1177{
1178 int ret;
1179 struct file *dfilp;
1180 int flags = O_RDONLY | O_LARGEFILE;
1181 struct ksmbd_readdir_data readdir_data = {
1182 .ctx.actor = __caseless_lookup,
1183 .private = name,
1184 .used = namelen,
1185 .dirent_count = 0,
1186 .um = um,
1187 };
1188
1189 dfilp = dentry_open(dir, flags, current_cred());
1190 if (IS_ERR(dfilp))
1191 return PTR_ERR(dfilp);
1192
1193 ret = iterate_dir(dfilp, &readdir_data.ctx);
1194 if (readdir_data.dirent_count > 0)
1195 ret = 0;
1196 fput(dfilp);
1197 return ret;
1198}
1199
1200/**
1201 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1202 * @work: work
1203 * @name: file path that is relative to share
1204 * @flags: lookup flags
1205 * @parent_path: if lookup succeed, return parent_path info
1206 * @path: if lookup succeed, return path info
1207 * @caseless: caseless filename lookup
1208 *
1209 * Return: 0 on success, otherwise error
1210 */
1211int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1212 unsigned int flags, struct path *parent_path,
1213 struct path *path, bool caseless)
1214{
1215 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1216 int err;
1217
1218 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1219 path);
1220 if (!err)
1221 return 0;
1222
1223 if (caseless) {
1224 char *filepath;
1225 size_t path_len, remain_len;
1226
1227 filepath = kstrdup(name, GFP_KERNEL);
1228 if (!filepath)
1229 return -ENOMEM;
1230
1231 path_len = strlen(filepath);
1232 remain_len = path_len;
1233
1234 *parent_path = share_conf->vfs_path;
1235 path_get(parent_path);
1236
1237 while (d_can_lookup(parent_path->dentry)) {
1238 char *filename = filepath + path_len - remain_len;
1239 char *next = strchrnul(filename, '/');
1240 size_t filename_len = next - filename;
1241 bool is_last = !next[0];
1242
1243 if (filename_len == 0)
1244 break;
1245
1246 err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1247 filename_len,
1248 work->conn->um);
1249 if (err)
1250 goto out2;
1251
1252 next[0] = '\0';
1253
1254 err = vfs_path_lookup(share_conf->vfs_path.dentry,
1255 share_conf->vfs_path.mnt,
1256 filepath,
1257 flags,
1258 path);
1259 if (err)
1260 goto out2;
1261 else if (is_last)
1262 goto out1;
1263 path_put(parent_path);
1264 *parent_path = *path;
1265
1266 next[0] = '/';
1267 remain_len -= filename_len + 1;
1268 }
1269
1270 err = -EINVAL;
1271out2:
1272 path_put(parent_path);
1273out1:
1274 kfree(filepath);
1275 }
1276
1277 if (!err) {
1278 err = mnt_want_write(parent_path->mnt);
1279 if (err) {
1280 path_put(path);
1281 path_put(parent_path);
1282 return err;
1283 }
1284
1285 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1286 if (err) {
1287 path_put(path);
1288 path_put(parent_path);
1289 }
1290 }
1291 return err;
1292}
1293
1294void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1295{
1296 inode_unlock(d_inode(parent_path->dentry));
1297 mnt_drop_write(parent_path->mnt);
1298 path_put(path);
1299 path_put(parent_path);
1300}
1301
1302struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1303 const char *name,
1304 unsigned int flags,
1305 struct path *path)
1306{
1307 char *abs_name;
1308 struct dentry *dent;
1309
1310 abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1311 if (!abs_name)
1312 return ERR_PTR(-ENOMEM);
1313
1314 dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1315 kfree(abs_name);
1316 return dent;
1317}
1318
1319int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1320 const struct path *path)
1321{
1322 char *name, *xattr_list = NULL;
1323 ssize_t xattr_list_len;
1324 int err = 0;
1325
1326 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1327 if (xattr_list_len < 0) {
1328 goto out;
1329 } else if (!xattr_list_len) {
1330 ksmbd_debug(SMB, "empty xattr in the file\n");
1331 goto out;
1332 }
1333
1334 err = mnt_want_write(path->mnt);
1335 if (err)
1336 goto out;
1337
1338 for (name = xattr_list; name - xattr_list < xattr_list_len;
1339 name += strlen(name) + 1) {
1340 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1341
1342 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1343 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1344 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1345 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1346 err = vfs_remove_acl(idmap, path->dentry, name);
1347 if (err)
1348 ksmbd_debug(SMB,
1349 "remove acl xattr failed : %s\n", name);
1350 }
1351 }
1352 mnt_drop_write(path->mnt);
1353
1354out:
1355 kvfree(xattr_list);
1356 return err;
1357}
1358
1359int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1360{
1361 char *name, *xattr_list = NULL;
1362 ssize_t xattr_list_len;
1363 int err = 0;
1364
1365 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1366 if (xattr_list_len < 0) {
1367 goto out;
1368 } else if (!xattr_list_len) {
1369 ksmbd_debug(SMB, "empty xattr in the file\n");
1370 goto out;
1371 }
1372
1373 for (name = xattr_list; name - xattr_list < xattr_list_len;
1374 name += strlen(name) + 1) {
1375 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1376
1377 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1378 err = ksmbd_vfs_remove_xattr(idmap, path, name);
1379 if (err)
1380 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1381 }
1382 }
1383out:
1384 kvfree(xattr_list);
1385 return err;
1386}
1387
1388static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1389 struct inode *inode,
1390 int acl_type)
1391{
1392 struct xattr_smb_acl *smb_acl = NULL;
1393 struct posix_acl *posix_acls;
1394 struct posix_acl_entry *pa_entry;
1395 struct xattr_acl_entry *xa_entry;
1396 int i;
1397
1398 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1399 return NULL;
1400
1401 posix_acls = get_inode_acl(inode, acl_type);
1402 if (IS_ERR_OR_NULL(posix_acls))
1403 return NULL;
1404
1405 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1406 sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1407 GFP_KERNEL);
1408 if (!smb_acl)
1409 goto out;
1410
1411 smb_acl->count = posix_acls->a_count;
1412 pa_entry = posix_acls->a_entries;
1413 xa_entry = smb_acl->entries;
1414 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1415 switch (pa_entry->e_tag) {
1416 case ACL_USER:
1417 xa_entry->type = SMB_ACL_USER;
1418 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1419 break;
1420 case ACL_USER_OBJ:
1421 xa_entry->type = SMB_ACL_USER_OBJ;
1422 break;
1423 case ACL_GROUP:
1424 xa_entry->type = SMB_ACL_GROUP;
1425 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1426 break;
1427 case ACL_GROUP_OBJ:
1428 xa_entry->type = SMB_ACL_GROUP_OBJ;
1429 break;
1430 case ACL_OTHER:
1431 xa_entry->type = SMB_ACL_OTHER;
1432 break;
1433 case ACL_MASK:
1434 xa_entry->type = SMB_ACL_MASK;
1435 break;
1436 default:
1437 pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1438 goto out;
1439 }
1440
1441 if (pa_entry->e_perm & ACL_READ)
1442 xa_entry->perm |= SMB_ACL_READ;
1443 if (pa_entry->e_perm & ACL_WRITE)
1444 xa_entry->perm |= SMB_ACL_WRITE;
1445 if (pa_entry->e_perm & ACL_EXECUTE)
1446 xa_entry->perm |= SMB_ACL_EXECUTE;
1447 }
1448out:
1449 posix_acl_release(posix_acls);
1450 return smb_acl;
1451}
1452
1453int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1454 struct mnt_idmap *idmap,
1455 const struct path *path,
1456 struct smb_ntsd *pntsd, int len,
1457 bool get_write)
1458{
1459 int rc;
1460 struct ndr sd_ndr = {0}, acl_ndr = {0};
1461 struct xattr_ntacl acl = {0};
1462 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1463 struct dentry *dentry = path->dentry;
1464 struct inode *inode = d_inode(dentry);
1465
1466 acl.version = 4;
1467 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1468 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1469
1470 memcpy(acl.desc, "posix_acl", 9);
1471 acl.desc_len = 10;
1472
1473 pntsd->osidoffset =
1474 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1475 pntsd->gsidoffset =
1476 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1477 pntsd->dacloffset =
1478 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1479
1480 acl.sd_buf = (char *)pntsd;
1481 acl.sd_size = len;
1482
1483 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1484 if (rc) {
1485 pr_err("failed to generate hash for ndr acl\n");
1486 return rc;
1487 }
1488
1489 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1490 ACL_TYPE_ACCESS);
1491 if (S_ISDIR(inode->i_mode))
1492 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1493 ACL_TYPE_DEFAULT);
1494
1495 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1496 smb_acl, def_smb_acl);
1497 if (rc) {
1498 pr_err("failed to encode ndr to posix acl\n");
1499 goto out;
1500 }
1501
1502 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1503 acl.posix_acl_hash);
1504 if (rc) {
1505 pr_err("failed to generate hash for ndr acl\n");
1506 goto out;
1507 }
1508
1509 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1510 if (rc) {
1511 pr_err("failed to encode ndr to posix acl\n");
1512 goto out;
1513 }
1514
1515 rc = ksmbd_vfs_setxattr(idmap, path,
1516 XATTR_NAME_SD, sd_ndr.data,
1517 sd_ndr.offset, 0, get_write);
1518 if (rc < 0)
1519 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1520
1521 kfree(sd_ndr.data);
1522out:
1523 kfree(acl_ndr.data);
1524 kfree(smb_acl);
1525 kfree(def_smb_acl);
1526 return rc;
1527}
1528
1529int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1530 struct mnt_idmap *idmap,
1531 struct dentry *dentry,
1532 struct smb_ntsd **pntsd)
1533{
1534 int rc;
1535 struct ndr n;
1536 struct inode *inode = d_inode(dentry);
1537 struct ndr acl_ndr = {0};
1538 struct xattr_ntacl acl;
1539 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1540 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1541
1542 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1543 if (rc <= 0)
1544 return rc;
1545
1546 n.length = rc;
1547 rc = ndr_decode_v4_ntacl(&n, &acl);
1548 if (rc)
1549 goto free_n_data;
1550
1551 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1552 ACL_TYPE_ACCESS);
1553 if (S_ISDIR(inode->i_mode))
1554 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1555 ACL_TYPE_DEFAULT);
1556
1557 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1558 def_smb_acl);
1559 if (rc) {
1560 pr_err("failed to encode ndr to posix acl\n");
1561 goto out_free;
1562 }
1563
1564 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1565 if (rc) {
1566 pr_err("failed to generate hash for ndr acl\n");
1567 goto out_free;
1568 }
1569
1570 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1571 pr_err("hash value diff\n");
1572 rc = -EINVAL;
1573 goto out_free;
1574 }
1575
1576 *pntsd = acl.sd_buf;
1577 if (acl.sd_size < sizeof(struct smb_ntsd)) {
1578 pr_err("sd size is invalid\n");
1579 goto out_free;
1580 }
1581
1582 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1583 NDR_NTSD_OFFSETOF);
1584 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1585 NDR_NTSD_OFFSETOF);
1586 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1587 NDR_NTSD_OFFSETOF);
1588
1589 rc = acl.sd_size;
1590out_free:
1591 kfree(acl_ndr.data);
1592 kfree(smb_acl);
1593 kfree(def_smb_acl);
1594 if (rc < 0) {
1595 kfree(acl.sd_buf);
1596 *pntsd = NULL;
1597 }
1598
1599free_n_data:
1600 kfree(n.data);
1601 return rc;
1602}
1603
1604int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1605 const struct path *path,
1606 struct xattr_dos_attrib *da,
1607 bool get_write)
1608{
1609 struct ndr n;
1610 int err;
1611
1612 err = ndr_encode_dos_attr(&n, da);
1613 if (err)
1614 return err;
1615
1616 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1617 (void *)n.data, n.offset, 0, get_write);
1618 if (err)
1619 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1620 kfree(n.data);
1621
1622 return err;
1623}
1624
1625int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1626 struct dentry *dentry,
1627 struct xattr_dos_attrib *da)
1628{
1629 struct ndr n;
1630 int err;
1631
1632 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1633 (char **)&n.data);
1634 if (err > 0) {
1635 n.length = err;
1636 if (ndr_decode_dos_attr(&n, da))
1637 err = -EINVAL;
1638 kfree(n.data);
1639 } else {
1640 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1641 }
1642
1643 return err;
1644}
1645
1646/**
1647 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1648 * @p: destination buffer
1649 * @ksmbd_kstat: ksmbd kstat wrapper
1650 *
1651 * Returns: pointer to the converted &struct file_directory_info
1652 */
1653void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1654{
1655 struct file_directory_info *info = (struct file_directory_info *)(*p);
1656 struct kstat *kstat = ksmbd_kstat->kstat;
1657 u64 time;
1658
1659 info->FileIndex = 0;
1660 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1661 time = ksmbd_UnixTimeToNT(kstat->atime);
1662 info->LastAccessTime = cpu_to_le64(time);
1663 time = ksmbd_UnixTimeToNT(kstat->mtime);
1664 info->LastWriteTime = cpu_to_le64(time);
1665 time = ksmbd_UnixTimeToNT(kstat->ctime);
1666 info->ChangeTime = cpu_to_le64(time);
1667
1668 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1669 info->EndOfFile = 0;
1670 info->AllocationSize = 0;
1671 } else {
1672 info->EndOfFile = cpu_to_le64(kstat->size);
1673 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1674 }
1675 info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1676
1677 return info;
1678}
1679
1680int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1681 struct mnt_idmap *idmap,
1682 struct dentry *dentry,
1683 struct ksmbd_kstat *ksmbd_kstat)
1684{
1685 u64 time;
1686 int rc;
1687
1688 generic_fillattr(idmap, STATX_BASIC_STATS, d_inode(dentry),
1689 ksmbd_kstat->kstat);
1690
1691 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1692 ksmbd_kstat->create_time = time;
1693
1694 /*
1695 * set default value for the case that store dos attributes is not yes
1696 * or that acl is disable in server's filesystem and the config is yes.
1697 */
1698 if (S_ISDIR(ksmbd_kstat->kstat->mode))
1699 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1700 else
1701 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1702
1703 if (test_share_config_flag(work->tcon->share_conf,
1704 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1705 struct xattr_dos_attrib da;
1706
1707 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1708 if (rc > 0) {
1709 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1710 ksmbd_kstat->create_time = da.create_time;
1711 } else {
1712 ksmbd_debug(VFS, "fail to load dos attribute.\n");
1713 }
1714 }
1715
1716 return 0;
1717}
1718
1719ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1720 struct dentry *dentry, char *attr_name,
1721 int attr_name_len)
1722{
1723 char *name, *xattr_list = NULL;
1724 ssize_t value_len = -ENOENT, xattr_list_len;
1725
1726 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1727 if (xattr_list_len <= 0)
1728 goto out;
1729
1730 for (name = xattr_list; name - xattr_list < xattr_list_len;
1731 name += strlen(name) + 1) {
1732 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1733 if (strncasecmp(attr_name, name, attr_name_len))
1734 continue;
1735
1736 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1737 break;
1738 }
1739
1740out:
1741 kvfree(xattr_list);
1742 return value_len;
1743}
1744
1745int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1746 size_t *xattr_stream_name_size, int s_type)
1747{
1748 char *type, *buf;
1749
1750 if (s_type == DIR_STREAM)
1751 type = ":$INDEX_ALLOCATION";
1752 else
1753 type = ":$DATA";
1754
1755 buf = kasprintf(GFP_KERNEL, "%s%s%s",
1756 XATTR_NAME_STREAM, stream_name, type);
1757 if (!buf)
1758 return -ENOMEM;
1759
1760 *xattr_stream_name = buf;
1761 *xattr_stream_name_size = strlen(buf) + 1;
1762
1763 return 0;
1764}
1765
1766int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1767 struct ksmbd_file *src_fp,
1768 struct ksmbd_file *dst_fp,
1769 struct srv_copychunk *chunks,
1770 unsigned int chunk_count,
1771 unsigned int *chunk_count_written,
1772 unsigned int *chunk_size_written,
1773 loff_t *total_size_written)
1774{
1775 unsigned int i;
1776 loff_t src_off, dst_off, src_file_size;
1777 size_t len;
1778 int ret;
1779
1780 *chunk_count_written = 0;
1781 *chunk_size_written = 0;
1782 *total_size_written = 0;
1783
1784 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1785 pr_err("no right to read(%pD)\n", src_fp->filp);
1786 return -EACCES;
1787 }
1788 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1789 pr_err("no right to write(%pD)\n", dst_fp->filp);
1790 return -EACCES;
1791 }
1792
1793 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1794 return -EBADF;
1795
1796 smb_break_all_levII_oplock(work, dst_fp, 1);
1797
1798 if (!work->tcon->posix_extensions) {
1799 for (i = 0; i < chunk_count; i++) {
1800 src_off = le64_to_cpu(chunks[i].SourceOffset);
1801 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1802 len = le32_to_cpu(chunks[i].Length);
1803
1804 if (check_lock_range(src_fp->filp, src_off,
1805 src_off + len - 1, READ))
1806 return -EAGAIN;
1807 if (check_lock_range(dst_fp->filp, dst_off,
1808 dst_off + len - 1, WRITE))
1809 return -EAGAIN;
1810 }
1811 }
1812
1813 src_file_size = i_size_read(file_inode(src_fp->filp));
1814
1815 for (i = 0; i < chunk_count; i++) {
1816 src_off = le64_to_cpu(chunks[i].SourceOffset);
1817 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1818 len = le32_to_cpu(chunks[i].Length);
1819
1820 if (src_off + len > src_file_size)
1821 return -E2BIG;
1822
1823 ret = vfs_copy_file_range(src_fp->filp, src_off,
1824 dst_fp->filp, dst_off, len, 0);
1825 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1826 ret = vfs_copy_file_range(src_fp->filp, src_off,
1827 dst_fp->filp, dst_off, len,
1828 COPY_FILE_SPLICE);
1829 if (ret < 0)
1830 return ret;
1831
1832 *chunk_count_written += 1;
1833 *total_size_written += ret;
1834 }
1835 return 0;
1836}
1837
1838void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1839{
1840 wait_event(flock->fl_wait, !flock->fl_blocker);
1841}
1842
1843int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1844{
1845 return wait_event_interruptible_timeout(flock->fl_wait,
1846 !flock->fl_blocker,
1847 timeout);
1848}
1849
1850void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1851{
1852 locks_delete_block(flock);
1853}
1854
1855int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1856 struct path *path)
1857{
1858 struct posix_acl_state acl_state;
1859 struct posix_acl *acls;
1860 struct dentry *dentry = path->dentry;
1861 struct inode *inode = d_inode(dentry);
1862 int rc;
1863
1864 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1865 return -EOPNOTSUPP;
1866
1867 ksmbd_debug(SMB, "Set posix acls\n");
1868 rc = init_acl_state(&acl_state, 1);
1869 if (rc)
1870 return rc;
1871
1872 /* Set default owner group */
1873 acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1874 acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1875 acl_state.other.allow = inode->i_mode & 0007;
1876 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1877 acl_state.users->aces[acl_state.users->n++].perms.allow =
1878 acl_state.owner.allow;
1879 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1880 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1881 acl_state.group.allow;
1882 acl_state.mask.allow = 0x07;
1883
1884 acls = posix_acl_alloc(6, GFP_KERNEL);
1885 if (!acls) {
1886 free_acl_state(&acl_state);
1887 return -ENOMEM;
1888 }
1889 posix_state_to_acl(&acl_state, acls->a_entries);
1890
1891 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1892 if (rc < 0)
1893 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1894 rc);
1895 else if (S_ISDIR(inode->i_mode)) {
1896 posix_state_to_acl(&acl_state, acls->a_entries);
1897 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1898 if (rc < 0)
1899 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1900 rc);
1901 }
1902
1903 free_acl_state(&acl_state);
1904 posix_acl_release(acls);
1905 return rc;
1906}
1907
1908int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1909 struct path *path, struct inode *parent_inode)
1910{
1911 struct posix_acl *acls;
1912 struct posix_acl_entry *pace;
1913 struct dentry *dentry = path->dentry;
1914 struct inode *inode = d_inode(dentry);
1915 int rc, i;
1916
1917 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1918 return -EOPNOTSUPP;
1919
1920 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1921 if (IS_ERR_OR_NULL(acls))
1922 return -ENOENT;
1923 pace = acls->a_entries;
1924
1925 for (i = 0; i < acls->a_count; i++, pace++) {
1926 if (pace->e_tag == ACL_MASK) {
1927 pace->e_perm = 0x07;
1928 break;
1929 }
1930 }
1931
1932 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1933 if (rc < 0)
1934 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1935 rc);
1936 if (S_ISDIR(inode->i_mode)) {
1937 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1938 acls);
1939 if (rc < 0)
1940 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1941 rc);
1942 }
1943
1944 posix_acl_release(acls);
1945 return rc;
1946}