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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 for_each_file_lock(flock, &ctx->flc_posix) {
341 /* check conflict locks */
342 if (flock->fl_end >= start && end >= flock->fl_start) {
343 if (lock_is_read(flock)) {
344 if (type == WRITE) {
345 pr_err("not allow write by shared lock\n");
346 error = 1;
347 goto out;
348 }
349 } else if (lock_is_write(flock)) {
350 /* check owner in lock */
351 if (flock->c.flc_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, KSMBD_DEFAULT_GFP);
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 | FILE_APPEND_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 /*
758 * explicitly handle file overwrite case, for compatibility with
759 * filesystems that may not support rename flags (e.g: fuse)
760 */
761 if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
762 err = -EEXIST;
763 goto out4;
764 }
765 flags &= ~(RENAME_NOREPLACE);
766
767 if (old_child == trap) {
768 err = -EINVAL;
769 goto out4;
770 }
771
772 if (new_dentry == trap) {
773 err = -ENOTEMPTY;
774 goto out4;
775 }
776
777 rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
778 rd.old_dir = d_inode(old_parent),
779 rd.old_dentry = old_child,
780 rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
781 rd.new_dir = new_path.dentry->d_inode,
782 rd.new_dentry = new_dentry,
783 rd.flags = flags,
784 rd.delegated_inode = NULL,
785 err = vfs_rename(&rd);
786 if (err)
787 ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
788
789out4:
790 dput(new_dentry);
791out3:
792 dput(old_parent);
793 unlock_rename(old_parent, new_path.dentry);
794out_drop_write:
795 mnt_drop_write(old_path->mnt);
796out2:
797 path_put(&new_path);
798
799 if (retry_estale(err, lookup_flags)) {
800 lookup_flags |= LOOKUP_REVAL;
801 goto retry;
802 }
803out1:
804 putname(to);
805revert_fsids:
806 ksmbd_revert_fsids(work);
807 return err;
808}
809
810/**
811 * ksmbd_vfs_truncate() - vfs helper for smb file truncate
812 * @work: work
813 * @fp: ksmbd file pointer
814 * @size: truncate to given size
815 *
816 * Return: 0 on success, otherwise error
817 */
818int ksmbd_vfs_truncate(struct ksmbd_work *work,
819 struct ksmbd_file *fp, loff_t size)
820{
821 int err = 0;
822 struct file *filp;
823
824 filp = fp->filp;
825
826 /* Do we need to break any of a levelII oplock? */
827 smb_break_all_levII_oplock(work, fp, 1);
828
829 if (!work->tcon->posix_extensions) {
830 struct inode *inode = file_inode(filp);
831
832 if (size < inode->i_size) {
833 err = check_lock_range(filp, size,
834 inode->i_size - 1, WRITE);
835 } else {
836 err = check_lock_range(filp, inode->i_size,
837 size - 1, WRITE);
838 }
839
840 if (err) {
841 pr_err("failed due to lock\n");
842 return -EAGAIN;
843 }
844 }
845
846 err = vfs_truncate(&filp->f_path, size);
847 if (err)
848 pr_err("truncate failed, err %d\n", err);
849 return err;
850}
851
852/**
853 * ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
854 * @dentry: dentry of file for listing xattrs
855 * @list: destination buffer
856 *
857 * Return: xattr list length on success, otherwise error
858 */
859ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
860{
861 ssize_t size;
862 char *vlist = NULL;
863
864 size = vfs_listxattr(dentry, NULL, 0);
865 if (size <= 0)
866 return size;
867
868 vlist = kvzalloc(size, KSMBD_DEFAULT_GFP);
869 if (!vlist)
870 return -ENOMEM;
871
872 *list = vlist;
873 size = vfs_listxattr(dentry, vlist, size);
874 if (size < 0) {
875 ksmbd_debug(VFS, "listxattr failed\n");
876 kvfree(vlist);
877 *list = NULL;
878 }
879
880 return size;
881}
882
883static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
884 struct dentry *dentry, char *xattr_name)
885{
886 return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
887}
888
889/**
890 * ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
891 * @idmap: idmap
892 * @dentry: dentry of file for getting xattrs
893 * @xattr_name: name of xattr name to query
894 * @xattr_buf: destination buffer xattr value
895 *
896 * Return: read xattr value length on success, otherwise error
897 */
898ssize_t ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
899 struct dentry *dentry,
900 char *xattr_name, char **xattr_buf)
901{
902 ssize_t xattr_len;
903 char *buf;
904
905 *xattr_buf = NULL;
906 xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
907 if (xattr_len < 0)
908 return xattr_len;
909
910 buf = kmalloc(xattr_len + 1, KSMBD_DEFAULT_GFP);
911 if (!buf)
912 return -ENOMEM;
913
914 xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
915 (void *)buf, xattr_len);
916 if (xattr_len > 0)
917 *xattr_buf = buf;
918 else
919 kfree(buf);
920 return xattr_len;
921}
922
923/**
924 * ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
925 * @idmap: idmap of the relevant mount
926 * @path: path of dentry to set XATTR at
927 * @attr_name: xattr name for setxattr
928 * @attr_value: xattr value to set
929 * @attr_size: size of xattr value
930 * @flags: destination buffer length
931 * @get_write: get write access to a mount
932 *
933 * Return: 0 on success, otherwise error
934 */
935int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
936 const struct path *path, const char *attr_name,
937 void *attr_value, size_t attr_size, int flags,
938 bool get_write)
939{
940 int err;
941
942 if (get_write == true) {
943 err = mnt_want_write(path->mnt);
944 if (err)
945 return err;
946 }
947
948 err = vfs_setxattr(idmap,
949 path->dentry,
950 attr_name,
951 attr_value,
952 attr_size,
953 flags);
954 if (err)
955 ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
956 if (get_write == true)
957 mnt_drop_write(path->mnt);
958 return err;
959}
960
961/**
962 * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
963 * @filp: file pointer for IO
964 * @option: smb IO options
965 */
966void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
967{
968 struct address_space *mapping;
969
970 mapping = filp->f_mapping;
971
972 if (!option || !mapping)
973 return;
974
975 if (option & FILE_WRITE_THROUGH_LE) {
976 filp->f_flags |= O_SYNC;
977 } else if (option & FILE_SEQUENTIAL_ONLY_LE) {
978 filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
979 spin_lock(&filp->f_lock);
980 filp->f_mode &= ~FMODE_RANDOM;
981 spin_unlock(&filp->f_lock);
982 } else if (option & FILE_RANDOM_ACCESS_LE) {
983 spin_lock(&filp->f_lock);
984 filp->f_mode |= FMODE_RANDOM;
985 spin_unlock(&filp->f_lock);
986 }
987}
988
989int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
990 loff_t off, loff_t len)
991{
992 smb_break_all_levII_oplock(work, fp, 1);
993 if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
994 return vfs_fallocate(fp->filp,
995 FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
996 off, len);
997
998 return vfs_fallocate(fp->filp,
999 FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
1000 off, len);
1001}
1002
1003int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
1004 struct file_allocated_range_buffer *ranges,
1005 unsigned int in_count, unsigned int *out_count)
1006{
1007 struct file *f = fp->filp;
1008 struct inode *inode = file_inode(fp->filp);
1009 loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
1010 loff_t extent_start, extent_end;
1011 int ret = 0;
1012
1013 if (start > maxbytes)
1014 return -EFBIG;
1015
1016 if (!in_count)
1017 return 0;
1018
1019 /*
1020 * Shrink request scope to what the fs can actually handle.
1021 */
1022 if (length > maxbytes || (maxbytes - length) < start)
1023 length = maxbytes - start;
1024
1025 if (start + length > inode->i_size)
1026 length = inode->i_size - start;
1027
1028 *out_count = 0;
1029 end = start + length;
1030 while (start < end && *out_count < in_count) {
1031 extent_start = vfs_llseek(f, start, SEEK_DATA);
1032 if (extent_start < 0) {
1033 if (extent_start != -ENXIO)
1034 ret = (int)extent_start;
1035 break;
1036 }
1037
1038 if (extent_start >= end)
1039 break;
1040
1041 extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
1042 if (extent_end < 0) {
1043 if (extent_end != -ENXIO)
1044 ret = (int)extent_end;
1045 break;
1046 } else if (extent_start >= extent_end) {
1047 break;
1048 }
1049
1050 ranges[*out_count].file_offset = cpu_to_le64(extent_start);
1051 ranges[(*out_count)++].length =
1052 cpu_to_le64(min(extent_end, end) - extent_start);
1053
1054 start = extent_end;
1055 }
1056
1057 return ret;
1058}
1059
1060int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
1061 const struct path *path, char *attr_name,
1062 bool get_write)
1063{
1064 int err;
1065
1066 if (get_write == true) {
1067 err = mnt_want_write(path->mnt);
1068 if (err)
1069 return err;
1070 }
1071
1072 err = vfs_removexattr(idmap, path->dentry, attr_name);
1073
1074 if (get_write == true)
1075 mnt_drop_write(path->mnt);
1076
1077 return err;
1078}
1079
1080int ksmbd_vfs_unlink(struct file *filp)
1081{
1082 int err = 0;
1083 struct dentry *dir, *dentry = filp->f_path.dentry;
1084 struct mnt_idmap *idmap = file_mnt_idmap(filp);
1085
1086 err = mnt_want_write(filp->f_path.mnt);
1087 if (err)
1088 return err;
1089
1090 dir = dget_parent(dentry);
1091 err = ksmbd_vfs_lock_parent(dir, dentry);
1092 if (err)
1093 goto out;
1094 dget(dentry);
1095
1096 if (S_ISDIR(d_inode(dentry)->i_mode))
1097 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1098 else
1099 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1100
1101 dput(dentry);
1102 inode_unlock(d_inode(dir));
1103 if (err)
1104 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1105out:
1106 dput(dir);
1107 mnt_drop_write(filp->f_path.mnt);
1108
1109 return err;
1110}
1111
1112static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1113 loff_t offset, u64 ino, unsigned int d_type)
1114{
1115 struct ksmbd_readdir_data *buf;
1116
1117 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1118 if (!is_dot_dotdot(name, namlen))
1119 buf->dirent_count++;
1120
1121 return !buf->dirent_count;
1122}
1123
1124/**
1125 * ksmbd_vfs_empty_dir() - check for empty directory
1126 * @fp: ksmbd file pointer
1127 *
1128 * Return: true if directory empty, otherwise false
1129 */
1130int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1131{
1132 int err;
1133 struct ksmbd_readdir_data readdir_data;
1134
1135 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1136
1137 set_ctx_actor(&readdir_data.ctx, __dir_empty);
1138 readdir_data.dirent_count = 0;
1139
1140 err = iterate_dir(fp->filp, &readdir_data.ctx);
1141 if (readdir_data.dirent_count)
1142 err = -ENOTEMPTY;
1143 else
1144 err = 0;
1145 return err;
1146}
1147
1148static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1149 int namlen, loff_t offset, u64 ino,
1150 unsigned int d_type)
1151{
1152 struct ksmbd_readdir_data *buf;
1153 int cmp = -EINVAL;
1154
1155 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1156
1157 if (buf->used != namlen)
1158 return true;
1159 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1160 const struct qstr q_buf = {.name = buf->private,
1161 .len = buf->used};
1162 const struct qstr q_name = {.name = name,
1163 .len = namlen};
1164
1165 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1166 }
1167 if (cmp < 0)
1168 cmp = strncasecmp((char *)buf->private, name, namlen);
1169 if (!cmp) {
1170 memcpy((char *)buf->private, name, buf->used);
1171 buf->dirent_count = 1;
1172 return false;
1173 }
1174 return true;
1175}
1176
1177/**
1178 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1179 * @dir: path info
1180 * @name: filename to lookup
1181 * @namelen: filename length
1182 * @um: &struct unicode_map to use
1183 *
1184 * Return: 0 on success, otherwise error
1185 */
1186static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1187 size_t namelen, struct unicode_map *um)
1188{
1189 int ret;
1190 struct file *dfilp;
1191 int flags = O_RDONLY | O_LARGEFILE;
1192 struct ksmbd_readdir_data readdir_data = {
1193 .ctx.actor = __caseless_lookup,
1194 .private = name,
1195 .used = namelen,
1196 .dirent_count = 0,
1197 .um = um,
1198 };
1199
1200 dfilp = dentry_open(dir, flags, current_cred());
1201 if (IS_ERR(dfilp))
1202 return PTR_ERR(dfilp);
1203
1204 ret = iterate_dir(dfilp, &readdir_data.ctx);
1205 if (readdir_data.dirent_count > 0)
1206 ret = 0;
1207 fput(dfilp);
1208 return ret;
1209}
1210
1211/**
1212 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1213 * @work: work
1214 * @name: file path that is relative to share
1215 * @flags: lookup flags
1216 * @parent_path: if lookup succeed, return parent_path info
1217 * @path: if lookup succeed, return path info
1218 * @caseless: caseless filename lookup
1219 *
1220 * Return: 0 on success, otherwise error
1221 */
1222int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1223 unsigned int flags, struct path *parent_path,
1224 struct path *path, bool caseless)
1225{
1226 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1227 int err;
1228
1229 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1230 path);
1231 if (!err)
1232 return 0;
1233
1234 if (caseless) {
1235 char *filepath;
1236 size_t path_len, remain_len;
1237
1238 filepath = name;
1239 path_len = strlen(filepath);
1240 remain_len = path_len;
1241
1242 *parent_path = share_conf->vfs_path;
1243 path_get(parent_path);
1244
1245 while (d_can_lookup(parent_path->dentry)) {
1246 char *filename = filepath + path_len - remain_len;
1247 char *next = strchrnul(filename, '/');
1248 size_t filename_len = next - filename;
1249 bool is_last = !next[0];
1250
1251 if (filename_len == 0)
1252 break;
1253
1254 err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1255 filename_len,
1256 work->conn->um);
1257 if (err)
1258 goto out2;
1259
1260 next[0] = '\0';
1261
1262 err = vfs_path_lookup(share_conf->vfs_path.dentry,
1263 share_conf->vfs_path.mnt,
1264 filepath,
1265 flags,
1266 path);
1267 if (!is_last)
1268 next[0] = '/';
1269 if (err)
1270 goto out2;
1271 else if (is_last)
1272 goto out1;
1273 path_put(parent_path);
1274 *parent_path = *path;
1275
1276 remain_len -= filename_len + 1;
1277 }
1278
1279 err = -EINVAL;
1280out2:
1281 path_put(parent_path);
1282 }
1283
1284out1:
1285 if (!err) {
1286 err = mnt_want_write(parent_path->mnt);
1287 if (err) {
1288 path_put(path);
1289 path_put(parent_path);
1290 return err;
1291 }
1292
1293 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1294 if (err) {
1295 path_put(path);
1296 path_put(parent_path);
1297 }
1298 }
1299 return err;
1300}
1301
1302void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1303{
1304 inode_unlock(d_inode(parent_path->dentry));
1305 mnt_drop_write(parent_path->mnt);
1306 path_put(path);
1307 path_put(parent_path);
1308}
1309
1310struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1311 const char *name,
1312 unsigned int flags,
1313 struct path *path)
1314{
1315 char *abs_name;
1316 struct dentry *dent;
1317
1318 abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1319 if (!abs_name)
1320 return ERR_PTR(-ENOMEM);
1321
1322 dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1323 kfree(abs_name);
1324 return dent;
1325}
1326
1327int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1328 const struct path *path)
1329{
1330 char *name, *xattr_list = NULL;
1331 ssize_t xattr_list_len;
1332 int err = 0;
1333
1334 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1335 if (xattr_list_len < 0) {
1336 goto out;
1337 } else if (!xattr_list_len) {
1338 ksmbd_debug(SMB, "empty xattr in the file\n");
1339 goto out;
1340 }
1341
1342 err = mnt_want_write(path->mnt);
1343 if (err)
1344 goto out;
1345
1346 for (name = xattr_list; name - xattr_list < xattr_list_len;
1347 name += strlen(name) + 1) {
1348 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1349
1350 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1351 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1352 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1353 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1354 err = vfs_remove_acl(idmap, path->dentry, name);
1355 if (err)
1356 ksmbd_debug(SMB,
1357 "remove acl xattr failed : %s\n", name);
1358 }
1359 }
1360 mnt_drop_write(path->mnt);
1361
1362out:
1363 kvfree(xattr_list);
1364 return err;
1365}
1366
1367int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1368{
1369 char *name, *xattr_list = NULL;
1370 ssize_t xattr_list_len;
1371 int err = 0;
1372
1373 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1374 if (xattr_list_len < 0) {
1375 goto out;
1376 } else if (!xattr_list_len) {
1377 ksmbd_debug(SMB, "empty xattr in the file\n");
1378 goto out;
1379 }
1380
1381 for (name = xattr_list; name - xattr_list < xattr_list_len;
1382 name += strlen(name) + 1) {
1383 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1384
1385 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1386 err = ksmbd_vfs_remove_xattr(idmap, path, name, true);
1387 if (err)
1388 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1389 }
1390 }
1391out:
1392 kvfree(xattr_list);
1393 return err;
1394}
1395
1396static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1397 struct inode *inode,
1398 int acl_type)
1399{
1400 struct xattr_smb_acl *smb_acl = NULL;
1401 struct posix_acl *posix_acls;
1402 struct posix_acl_entry *pa_entry;
1403 struct xattr_acl_entry *xa_entry;
1404 int i;
1405
1406 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1407 return NULL;
1408
1409 posix_acls = get_inode_acl(inode, acl_type);
1410 if (IS_ERR_OR_NULL(posix_acls))
1411 return NULL;
1412
1413 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1414 sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1415 KSMBD_DEFAULT_GFP);
1416 if (!smb_acl)
1417 goto out;
1418
1419 smb_acl->count = posix_acls->a_count;
1420 pa_entry = posix_acls->a_entries;
1421 xa_entry = smb_acl->entries;
1422 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1423 switch (pa_entry->e_tag) {
1424 case ACL_USER:
1425 xa_entry->type = SMB_ACL_USER;
1426 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1427 break;
1428 case ACL_USER_OBJ:
1429 xa_entry->type = SMB_ACL_USER_OBJ;
1430 break;
1431 case ACL_GROUP:
1432 xa_entry->type = SMB_ACL_GROUP;
1433 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1434 break;
1435 case ACL_GROUP_OBJ:
1436 xa_entry->type = SMB_ACL_GROUP_OBJ;
1437 break;
1438 case ACL_OTHER:
1439 xa_entry->type = SMB_ACL_OTHER;
1440 break;
1441 case ACL_MASK:
1442 xa_entry->type = SMB_ACL_MASK;
1443 break;
1444 default:
1445 pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1446 goto out;
1447 }
1448
1449 if (pa_entry->e_perm & ACL_READ)
1450 xa_entry->perm |= SMB_ACL_READ;
1451 if (pa_entry->e_perm & ACL_WRITE)
1452 xa_entry->perm |= SMB_ACL_WRITE;
1453 if (pa_entry->e_perm & ACL_EXECUTE)
1454 xa_entry->perm |= SMB_ACL_EXECUTE;
1455 }
1456out:
1457 posix_acl_release(posix_acls);
1458 return smb_acl;
1459}
1460
1461int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1462 struct mnt_idmap *idmap,
1463 const struct path *path,
1464 struct smb_ntsd *pntsd, int len,
1465 bool get_write)
1466{
1467 int rc;
1468 struct ndr sd_ndr = {0}, acl_ndr = {0};
1469 struct xattr_ntacl acl = {0};
1470 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1471 struct dentry *dentry = path->dentry;
1472 struct inode *inode = d_inode(dentry);
1473
1474 acl.version = 4;
1475 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1476 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1477
1478 memcpy(acl.desc, "posix_acl", 9);
1479 acl.desc_len = 10;
1480
1481 pntsd->osidoffset =
1482 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1483 pntsd->gsidoffset =
1484 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1485 pntsd->dacloffset =
1486 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1487
1488 acl.sd_buf = (char *)pntsd;
1489 acl.sd_size = len;
1490
1491 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1492 if (rc) {
1493 pr_err("failed to generate hash for ndr acl\n");
1494 return rc;
1495 }
1496
1497 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1498 ACL_TYPE_ACCESS);
1499 if (S_ISDIR(inode->i_mode))
1500 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1501 ACL_TYPE_DEFAULT);
1502
1503 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1504 smb_acl, def_smb_acl);
1505 if (rc) {
1506 pr_err("failed to encode ndr to posix acl\n");
1507 goto out;
1508 }
1509
1510 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1511 acl.posix_acl_hash);
1512 if (rc) {
1513 pr_err("failed to generate hash for ndr acl\n");
1514 goto out;
1515 }
1516
1517 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1518 if (rc) {
1519 pr_err("failed to encode ndr to posix acl\n");
1520 goto out;
1521 }
1522
1523 rc = ksmbd_vfs_setxattr(idmap, path,
1524 XATTR_NAME_SD, sd_ndr.data,
1525 sd_ndr.offset, 0, get_write);
1526 if (rc < 0)
1527 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1528
1529 kfree(sd_ndr.data);
1530out:
1531 kfree(acl_ndr.data);
1532 kfree(smb_acl);
1533 kfree(def_smb_acl);
1534 return rc;
1535}
1536
1537int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1538 struct mnt_idmap *idmap,
1539 struct dentry *dentry,
1540 struct smb_ntsd **pntsd)
1541{
1542 int rc;
1543 struct ndr n;
1544 struct inode *inode = d_inode(dentry);
1545 struct ndr acl_ndr = {0};
1546 struct xattr_ntacl acl;
1547 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1548 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1549
1550 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1551 if (rc <= 0)
1552 return rc;
1553
1554 n.length = rc;
1555 rc = ndr_decode_v4_ntacl(&n, &acl);
1556 if (rc)
1557 goto free_n_data;
1558
1559 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1560 ACL_TYPE_ACCESS);
1561 if (S_ISDIR(inode->i_mode))
1562 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1563 ACL_TYPE_DEFAULT);
1564
1565 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1566 def_smb_acl);
1567 if (rc) {
1568 pr_err("failed to encode ndr to posix acl\n");
1569 goto out_free;
1570 }
1571
1572 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1573 if (rc) {
1574 pr_err("failed to generate hash for ndr acl\n");
1575 goto out_free;
1576 }
1577
1578 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1579 pr_err("hash value diff\n");
1580 rc = -EINVAL;
1581 goto out_free;
1582 }
1583
1584 *pntsd = acl.sd_buf;
1585 if (acl.sd_size < sizeof(struct smb_ntsd)) {
1586 pr_err("sd size is invalid\n");
1587 goto out_free;
1588 }
1589
1590 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1591 NDR_NTSD_OFFSETOF);
1592 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1593 NDR_NTSD_OFFSETOF);
1594 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1595 NDR_NTSD_OFFSETOF);
1596
1597 rc = acl.sd_size;
1598out_free:
1599 kfree(acl_ndr.data);
1600 kfree(smb_acl);
1601 kfree(def_smb_acl);
1602 if (rc < 0) {
1603 kfree(acl.sd_buf);
1604 *pntsd = NULL;
1605 }
1606
1607free_n_data:
1608 kfree(n.data);
1609 return rc;
1610}
1611
1612int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1613 const struct path *path,
1614 struct xattr_dos_attrib *da,
1615 bool get_write)
1616{
1617 struct ndr n;
1618 int err;
1619
1620 err = ndr_encode_dos_attr(&n, da);
1621 if (err)
1622 return err;
1623
1624 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1625 (void *)n.data, n.offset, 0, get_write);
1626 if (err)
1627 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1628 kfree(n.data);
1629
1630 return err;
1631}
1632
1633int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1634 struct dentry *dentry,
1635 struct xattr_dos_attrib *da)
1636{
1637 struct ndr n;
1638 int err;
1639
1640 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1641 (char **)&n.data);
1642 if (err > 0) {
1643 n.length = err;
1644 if (ndr_decode_dos_attr(&n, da))
1645 err = -EINVAL;
1646 kfree(n.data);
1647 } else {
1648 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1649 }
1650
1651 return err;
1652}
1653
1654/**
1655 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1656 * @p: destination buffer
1657 * @ksmbd_kstat: ksmbd kstat wrapper
1658 *
1659 * Returns: pointer to the converted &struct file_directory_info
1660 */
1661void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1662{
1663 struct file_directory_info *info = (struct file_directory_info *)(*p);
1664 struct kstat *kstat = ksmbd_kstat->kstat;
1665 u64 time;
1666
1667 info->FileIndex = 0;
1668 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1669 time = ksmbd_UnixTimeToNT(kstat->atime);
1670 info->LastAccessTime = cpu_to_le64(time);
1671 time = ksmbd_UnixTimeToNT(kstat->mtime);
1672 info->LastWriteTime = cpu_to_le64(time);
1673 time = ksmbd_UnixTimeToNT(kstat->ctime);
1674 info->ChangeTime = cpu_to_le64(time);
1675
1676 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1677 info->EndOfFile = 0;
1678 info->AllocationSize = 0;
1679 } else {
1680 info->EndOfFile = cpu_to_le64(kstat->size);
1681 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1682 }
1683 info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1684
1685 return info;
1686}
1687
1688int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1689 struct mnt_idmap *idmap,
1690 struct dentry *dentry,
1691 struct ksmbd_kstat *ksmbd_kstat)
1692{
1693 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1694 u64 time;
1695 int rc;
1696 struct path path = {
1697 .mnt = share_conf->vfs_path.mnt,
1698 .dentry = dentry,
1699 };
1700
1701 rc = vfs_getattr(&path, ksmbd_kstat->kstat,
1702 STATX_BASIC_STATS | STATX_BTIME,
1703 AT_STATX_SYNC_AS_STAT);
1704 if (rc)
1705 return rc;
1706
1707 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1708 ksmbd_kstat->create_time = time;
1709
1710 /*
1711 * set default value for the case that store dos attributes is not yes
1712 * or that acl is disable in server's filesystem and the config is yes.
1713 */
1714 if (S_ISDIR(ksmbd_kstat->kstat->mode))
1715 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1716 else
1717 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1718
1719 if (test_share_config_flag(work->tcon->share_conf,
1720 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1721 struct xattr_dos_attrib da;
1722
1723 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1724 if (rc > 0) {
1725 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1726 ksmbd_kstat->create_time = da.create_time;
1727 } else {
1728 ksmbd_debug(VFS, "fail to load dos attribute.\n");
1729 }
1730 }
1731
1732 return 0;
1733}
1734
1735ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1736 struct dentry *dentry, char *attr_name,
1737 int attr_name_len)
1738{
1739 char *name, *xattr_list = NULL;
1740 ssize_t value_len = -ENOENT, xattr_list_len;
1741
1742 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1743 if (xattr_list_len <= 0)
1744 goto out;
1745
1746 for (name = xattr_list; name - xattr_list < xattr_list_len;
1747 name += strlen(name) + 1) {
1748 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1749 if (strncasecmp(attr_name, name, attr_name_len))
1750 continue;
1751
1752 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1753 break;
1754 }
1755
1756out:
1757 kvfree(xattr_list);
1758 return value_len;
1759}
1760
1761int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1762 size_t *xattr_stream_name_size, int s_type)
1763{
1764 char *type, *buf;
1765
1766 if (s_type == DIR_STREAM)
1767 type = ":$INDEX_ALLOCATION";
1768 else
1769 type = ":$DATA";
1770
1771 buf = kasprintf(KSMBD_DEFAULT_GFP, "%s%s%s",
1772 XATTR_NAME_STREAM, stream_name, type);
1773 if (!buf)
1774 return -ENOMEM;
1775
1776 *xattr_stream_name = buf;
1777 *xattr_stream_name_size = strlen(buf) + 1;
1778
1779 return 0;
1780}
1781
1782int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1783 struct ksmbd_file *src_fp,
1784 struct ksmbd_file *dst_fp,
1785 struct srv_copychunk *chunks,
1786 unsigned int chunk_count,
1787 unsigned int *chunk_count_written,
1788 unsigned int *chunk_size_written,
1789 loff_t *total_size_written)
1790{
1791 unsigned int i;
1792 loff_t src_off, dst_off, src_file_size;
1793 size_t len;
1794 int ret;
1795
1796 *chunk_count_written = 0;
1797 *chunk_size_written = 0;
1798 *total_size_written = 0;
1799
1800 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1801 pr_err("no right to read(%pD)\n", src_fp->filp);
1802 return -EACCES;
1803 }
1804 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1805 pr_err("no right to write(%pD)\n", dst_fp->filp);
1806 return -EACCES;
1807 }
1808
1809 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1810 return -EBADF;
1811
1812 smb_break_all_levII_oplock(work, dst_fp, 1);
1813
1814 if (!work->tcon->posix_extensions) {
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 (check_lock_range(src_fp->filp, src_off,
1821 src_off + len - 1, READ))
1822 return -EAGAIN;
1823 if (check_lock_range(dst_fp->filp, dst_off,
1824 dst_off + len - 1, WRITE))
1825 return -EAGAIN;
1826 }
1827 }
1828
1829 src_file_size = i_size_read(file_inode(src_fp->filp));
1830
1831 for (i = 0; i < chunk_count; i++) {
1832 src_off = le64_to_cpu(chunks[i].SourceOffset);
1833 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1834 len = le32_to_cpu(chunks[i].Length);
1835
1836 if (src_off + len > src_file_size)
1837 return -E2BIG;
1838
1839 ret = vfs_copy_file_range(src_fp->filp, src_off,
1840 dst_fp->filp, dst_off, len, 0);
1841 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1842 ret = vfs_copy_file_range(src_fp->filp, src_off,
1843 dst_fp->filp, dst_off, len,
1844 COPY_FILE_SPLICE);
1845 if (ret < 0)
1846 return ret;
1847
1848 *chunk_count_written += 1;
1849 *total_size_written += ret;
1850 }
1851 return 0;
1852}
1853
1854void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1855{
1856 wait_event(flock->c.flc_wait, !flock->c.flc_blocker);
1857}
1858
1859int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1860{
1861 return wait_event_interruptible_timeout(flock->c.flc_wait,
1862 !flock->c.flc_blocker,
1863 timeout);
1864}
1865
1866void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1867{
1868 locks_delete_block(flock);
1869}
1870
1871int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1872 struct path *path)
1873{
1874 struct posix_acl_state acl_state;
1875 struct posix_acl *acls;
1876 struct dentry *dentry = path->dentry;
1877 struct inode *inode = d_inode(dentry);
1878 int rc;
1879
1880 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1881 return -EOPNOTSUPP;
1882
1883 ksmbd_debug(SMB, "Set posix acls\n");
1884 rc = init_acl_state(&acl_state, 1);
1885 if (rc)
1886 return rc;
1887
1888 /* Set default owner group */
1889 acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1890 acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1891 acl_state.other.allow = inode->i_mode & 0007;
1892 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1893 acl_state.users->aces[acl_state.users->n++].perms.allow =
1894 acl_state.owner.allow;
1895 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1896 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1897 acl_state.group.allow;
1898 acl_state.mask.allow = 0x07;
1899
1900 acls = posix_acl_alloc(6, KSMBD_DEFAULT_GFP);
1901 if (!acls) {
1902 free_acl_state(&acl_state);
1903 return -ENOMEM;
1904 }
1905 posix_state_to_acl(&acl_state, acls->a_entries);
1906
1907 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1908 if (rc < 0)
1909 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1910 rc);
1911 else if (S_ISDIR(inode->i_mode)) {
1912 posix_state_to_acl(&acl_state, acls->a_entries);
1913 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1914 if (rc < 0)
1915 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1916 rc);
1917 }
1918
1919 free_acl_state(&acl_state);
1920 posix_acl_release(acls);
1921 return rc;
1922}
1923
1924int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1925 struct path *path, struct inode *parent_inode)
1926{
1927 struct posix_acl *acls;
1928 struct posix_acl_entry *pace;
1929 struct dentry *dentry = path->dentry;
1930 struct inode *inode = d_inode(dentry);
1931 int rc, i;
1932
1933 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1934 return -EOPNOTSUPP;
1935
1936 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1937 if (IS_ERR_OR_NULL(acls))
1938 return -ENOENT;
1939 pace = acls->a_entries;
1940
1941 for (i = 0; i < acls->a_count; i++, pace++) {
1942 if (pace->e_tag == ACL_MASK) {
1943 pace->e_perm = 0x07;
1944 break;
1945 }
1946 }
1947
1948 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1949 if (rc < 0)
1950 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1951 rc);
1952 if (S_ISDIR(inode->i_mode)) {
1953 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1954 acls);
1955 if (rc < 0)
1956 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1957 rc);
1958 }
1959
1960 posix_acl_release(acls);
1961 return rc;
1962}