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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, 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 /*
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, GFP_KERNEL);
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, GFP_KERNEL);
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{
1063 int err;
1064
1065 err = mnt_want_write(path->mnt);
1066 if (err)
1067 return err;
1068
1069 err = vfs_removexattr(idmap, path->dentry, attr_name);
1070 mnt_drop_write(path->mnt);
1071
1072 return err;
1073}
1074
1075int ksmbd_vfs_unlink(struct file *filp)
1076{
1077 int err = 0;
1078 struct dentry *dir, *dentry = filp->f_path.dentry;
1079 struct mnt_idmap *idmap = file_mnt_idmap(filp);
1080
1081 err = mnt_want_write(filp->f_path.mnt);
1082 if (err)
1083 return err;
1084
1085 dir = dget_parent(dentry);
1086 err = ksmbd_vfs_lock_parent(dir, dentry);
1087 if (err)
1088 goto out;
1089 dget(dentry);
1090
1091 if (S_ISDIR(d_inode(dentry)->i_mode))
1092 err = vfs_rmdir(idmap, d_inode(dir), dentry);
1093 else
1094 err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
1095
1096 dput(dentry);
1097 inode_unlock(d_inode(dir));
1098 if (err)
1099 ksmbd_debug(VFS, "failed to delete, err %d\n", err);
1100out:
1101 dput(dir);
1102 mnt_drop_write(filp->f_path.mnt);
1103
1104 return err;
1105}
1106
1107static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
1108 loff_t offset, u64 ino, unsigned int d_type)
1109{
1110 struct ksmbd_readdir_data *buf;
1111
1112 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1113 buf->dirent_count++;
1114
1115 return buf->dirent_count <= 2;
1116}
1117
1118/**
1119 * ksmbd_vfs_empty_dir() - check for empty directory
1120 * @fp: ksmbd file pointer
1121 *
1122 * Return: true if directory empty, otherwise false
1123 */
1124int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
1125{
1126 int err;
1127 struct ksmbd_readdir_data readdir_data;
1128
1129 memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
1130
1131 set_ctx_actor(&readdir_data.ctx, __dir_empty);
1132 readdir_data.dirent_count = 0;
1133
1134 err = iterate_dir(fp->filp, &readdir_data.ctx);
1135 if (readdir_data.dirent_count > 2)
1136 err = -ENOTEMPTY;
1137 else
1138 err = 0;
1139 return err;
1140}
1141
1142static bool __caseless_lookup(struct dir_context *ctx, const char *name,
1143 int namlen, loff_t offset, u64 ino,
1144 unsigned int d_type)
1145{
1146 struct ksmbd_readdir_data *buf;
1147 int cmp = -EINVAL;
1148
1149 buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
1150
1151 if (buf->used != namlen)
1152 return true;
1153 if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
1154 const struct qstr q_buf = {.name = buf->private,
1155 .len = buf->used};
1156 const struct qstr q_name = {.name = name,
1157 .len = namlen};
1158
1159 cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
1160 }
1161 if (cmp < 0)
1162 cmp = strncasecmp((char *)buf->private, name, namlen);
1163 if (!cmp) {
1164 memcpy((char *)buf->private, name, namlen);
1165 buf->dirent_count = 1;
1166 return false;
1167 }
1168 return true;
1169}
1170
1171/**
1172 * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
1173 * @dir: path info
1174 * @name: filename to lookup
1175 * @namelen: filename length
1176 * @um: &struct unicode_map to use
1177 *
1178 * Return: 0 on success, otherwise error
1179 */
1180static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
1181 size_t namelen, struct unicode_map *um)
1182{
1183 int ret;
1184 struct file *dfilp;
1185 int flags = O_RDONLY | O_LARGEFILE;
1186 struct ksmbd_readdir_data readdir_data = {
1187 .ctx.actor = __caseless_lookup,
1188 .private = name,
1189 .used = namelen,
1190 .dirent_count = 0,
1191 .um = um,
1192 };
1193
1194 dfilp = dentry_open(dir, flags, current_cred());
1195 if (IS_ERR(dfilp))
1196 return PTR_ERR(dfilp);
1197
1198 ret = iterate_dir(dfilp, &readdir_data.ctx);
1199 if (readdir_data.dirent_count > 0)
1200 ret = 0;
1201 fput(dfilp);
1202 return ret;
1203}
1204
1205/**
1206 * ksmbd_vfs_kern_path_locked() - lookup a file and get path info
1207 * @work: work
1208 * @name: file path that is relative to share
1209 * @flags: lookup flags
1210 * @parent_path: if lookup succeed, return parent_path info
1211 * @path: if lookup succeed, return path info
1212 * @caseless: caseless filename lookup
1213 *
1214 * Return: 0 on success, otherwise error
1215 */
1216int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
1217 unsigned int flags, struct path *parent_path,
1218 struct path *path, bool caseless)
1219{
1220 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1221 int err;
1222
1223 err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
1224 path);
1225 if (!err)
1226 return 0;
1227
1228 if (caseless) {
1229 char *filepath;
1230 size_t path_len, remain_len;
1231
1232 filepath = kstrdup(name, GFP_KERNEL);
1233 if (!filepath)
1234 return -ENOMEM;
1235
1236 path_len = strlen(filepath);
1237 remain_len = path_len;
1238
1239 *parent_path = share_conf->vfs_path;
1240 path_get(parent_path);
1241
1242 while (d_can_lookup(parent_path->dentry)) {
1243 char *filename = filepath + path_len - remain_len;
1244 char *next = strchrnul(filename, '/');
1245 size_t filename_len = next - filename;
1246 bool is_last = !next[0];
1247
1248 if (filename_len == 0)
1249 break;
1250
1251 err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
1252 filename_len,
1253 work->conn->um);
1254 if (err)
1255 goto out2;
1256
1257 next[0] = '\0';
1258
1259 err = vfs_path_lookup(share_conf->vfs_path.dentry,
1260 share_conf->vfs_path.mnt,
1261 filepath,
1262 flags,
1263 path);
1264 if (err)
1265 goto out2;
1266 else if (is_last)
1267 goto out1;
1268 path_put(parent_path);
1269 *parent_path = *path;
1270
1271 next[0] = '/';
1272 remain_len -= filename_len + 1;
1273 }
1274
1275 err = -EINVAL;
1276out2:
1277 path_put(parent_path);
1278out1:
1279 kfree(filepath);
1280 }
1281
1282 if (!err) {
1283 err = mnt_want_write(parent_path->mnt);
1284 if (err) {
1285 path_put(path);
1286 path_put(parent_path);
1287 return err;
1288 }
1289
1290 err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
1291 if (err) {
1292 path_put(path);
1293 path_put(parent_path);
1294 }
1295 }
1296 return err;
1297}
1298
1299void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
1300{
1301 inode_unlock(d_inode(parent_path->dentry));
1302 mnt_drop_write(parent_path->mnt);
1303 path_put(path);
1304 path_put(parent_path);
1305}
1306
1307struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
1308 const char *name,
1309 unsigned int flags,
1310 struct path *path)
1311{
1312 char *abs_name;
1313 struct dentry *dent;
1314
1315 abs_name = convert_to_unix_name(work->tcon->share_conf, name);
1316 if (!abs_name)
1317 return ERR_PTR(-ENOMEM);
1318
1319 dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
1320 kfree(abs_name);
1321 return dent;
1322}
1323
1324int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
1325 const struct path *path)
1326{
1327 char *name, *xattr_list = NULL;
1328 ssize_t xattr_list_len;
1329 int err = 0;
1330
1331 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1332 if (xattr_list_len < 0) {
1333 goto out;
1334 } else if (!xattr_list_len) {
1335 ksmbd_debug(SMB, "empty xattr in the file\n");
1336 goto out;
1337 }
1338
1339 err = mnt_want_write(path->mnt);
1340 if (err)
1341 goto out;
1342
1343 for (name = xattr_list; name - xattr_list < xattr_list_len;
1344 name += strlen(name) + 1) {
1345 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1346
1347 if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
1348 sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
1349 !strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
1350 sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
1351 err = vfs_remove_acl(idmap, path->dentry, name);
1352 if (err)
1353 ksmbd_debug(SMB,
1354 "remove acl xattr failed : %s\n", name);
1355 }
1356 }
1357 mnt_drop_write(path->mnt);
1358
1359out:
1360 kvfree(xattr_list);
1361 return err;
1362}
1363
1364int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
1365{
1366 char *name, *xattr_list = NULL;
1367 ssize_t xattr_list_len;
1368 int err = 0;
1369
1370 xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
1371 if (xattr_list_len < 0) {
1372 goto out;
1373 } else if (!xattr_list_len) {
1374 ksmbd_debug(SMB, "empty xattr in the file\n");
1375 goto out;
1376 }
1377
1378 for (name = xattr_list; name - xattr_list < xattr_list_len;
1379 name += strlen(name) + 1) {
1380 ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
1381
1382 if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
1383 err = ksmbd_vfs_remove_xattr(idmap, path, name);
1384 if (err)
1385 ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
1386 }
1387 }
1388out:
1389 kvfree(xattr_list);
1390 return err;
1391}
1392
1393static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
1394 struct inode *inode,
1395 int acl_type)
1396{
1397 struct xattr_smb_acl *smb_acl = NULL;
1398 struct posix_acl *posix_acls;
1399 struct posix_acl_entry *pa_entry;
1400 struct xattr_acl_entry *xa_entry;
1401 int i;
1402
1403 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1404 return NULL;
1405
1406 posix_acls = get_inode_acl(inode, acl_type);
1407 if (IS_ERR_OR_NULL(posix_acls))
1408 return NULL;
1409
1410 smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
1411 sizeof(struct xattr_acl_entry) * posix_acls->a_count,
1412 GFP_KERNEL);
1413 if (!smb_acl)
1414 goto out;
1415
1416 smb_acl->count = posix_acls->a_count;
1417 pa_entry = posix_acls->a_entries;
1418 xa_entry = smb_acl->entries;
1419 for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
1420 switch (pa_entry->e_tag) {
1421 case ACL_USER:
1422 xa_entry->type = SMB_ACL_USER;
1423 xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
1424 break;
1425 case ACL_USER_OBJ:
1426 xa_entry->type = SMB_ACL_USER_OBJ;
1427 break;
1428 case ACL_GROUP:
1429 xa_entry->type = SMB_ACL_GROUP;
1430 xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
1431 break;
1432 case ACL_GROUP_OBJ:
1433 xa_entry->type = SMB_ACL_GROUP_OBJ;
1434 break;
1435 case ACL_OTHER:
1436 xa_entry->type = SMB_ACL_OTHER;
1437 break;
1438 case ACL_MASK:
1439 xa_entry->type = SMB_ACL_MASK;
1440 break;
1441 default:
1442 pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
1443 goto out;
1444 }
1445
1446 if (pa_entry->e_perm & ACL_READ)
1447 xa_entry->perm |= SMB_ACL_READ;
1448 if (pa_entry->e_perm & ACL_WRITE)
1449 xa_entry->perm |= SMB_ACL_WRITE;
1450 if (pa_entry->e_perm & ACL_EXECUTE)
1451 xa_entry->perm |= SMB_ACL_EXECUTE;
1452 }
1453out:
1454 posix_acl_release(posix_acls);
1455 return smb_acl;
1456}
1457
1458int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
1459 struct mnt_idmap *idmap,
1460 const struct path *path,
1461 struct smb_ntsd *pntsd, int len,
1462 bool get_write)
1463{
1464 int rc;
1465 struct ndr sd_ndr = {0}, acl_ndr = {0};
1466 struct xattr_ntacl acl = {0};
1467 struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
1468 struct dentry *dentry = path->dentry;
1469 struct inode *inode = d_inode(dentry);
1470
1471 acl.version = 4;
1472 acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
1473 acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
1474
1475 memcpy(acl.desc, "posix_acl", 9);
1476 acl.desc_len = 10;
1477
1478 pntsd->osidoffset =
1479 cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
1480 pntsd->gsidoffset =
1481 cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
1482 pntsd->dacloffset =
1483 cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
1484
1485 acl.sd_buf = (char *)pntsd;
1486 acl.sd_size = len;
1487
1488 rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
1489 if (rc) {
1490 pr_err("failed to generate hash for ndr acl\n");
1491 return rc;
1492 }
1493
1494 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1495 ACL_TYPE_ACCESS);
1496 if (S_ISDIR(inode->i_mode))
1497 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1498 ACL_TYPE_DEFAULT);
1499
1500 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
1501 smb_acl, def_smb_acl);
1502 if (rc) {
1503 pr_err("failed to encode ndr to posix acl\n");
1504 goto out;
1505 }
1506
1507 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
1508 acl.posix_acl_hash);
1509 if (rc) {
1510 pr_err("failed to generate hash for ndr acl\n");
1511 goto out;
1512 }
1513
1514 rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
1515 if (rc) {
1516 pr_err("failed to encode ndr to posix acl\n");
1517 goto out;
1518 }
1519
1520 rc = ksmbd_vfs_setxattr(idmap, path,
1521 XATTR_NAME_SD, sd_ndr.data,
1522 sd_ndr.offset, 0, get_write);
1523 if (rc < 0)
1524 pr_err("Failed to store XATTR ntacl :%d\n", rc);
1525
1526 kfree(sd_ndr.data);
1527out:
1528 kfree(acl_ndr.data);
1529 kfree(smb_acl);
1530 kfree(def_smb_acl);
1531 return rc;
1532}
1533
1534int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
1535 struct mnt_idmap *idmap,
1536 struct dentry *dentry,
1537 struct smb_ntsd **pntsd)
1538{
1539 int rc;
1540 struct ndr n;
1541 struct inode *inode = d_inode(dentry);
1542 struct ndr acl_ndr = {0};
1543 struct xattr_ntacl acl;
1544 struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
1545 __u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
1546
1547 rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
1548 if (rc <= 0)
1549 return rc;
1550
1551 n.length = rc;
1552 rc = ndr_decode_v4_ntacl(&n, &acl);
1553 if (rc)
1554 goto free_n_data;
1555
1556 smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1557 ACL_TYPE_ACCESS);
1558 if (S_ISDIR(inode->i_mode))
1559 def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
1560 ACL_TYPE_DEFAULT);
1561
1562 rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
1563 def_smb_acl);
1564 if (rc) {
1565 pr_err("failed to encode ndr to posix acl\n");
1566 goto out_free;
1567 }
1568
1569 rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
1570 if (rc) {
1571 pr_err("failed to generate hash for ndr acl\n");
1572 goto out_free;
1573 }
1574
1575 if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
1576 pr_err("hash value diff\n");
1577 rc = -EINVAL;
1578 goto out_free;
1579 }
1580
1581 *pntsd = acl.sd_buf;
1582 if (acl.sd_size < sizeof(struct smb_ntsd)) {
1583 pr_err("sd size is invalid\n");
1584 goto out_free;
1585 }
1586
1587 (*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
1588 NDR_NTSD_OFFSETOF);
1589 (*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
1590 NDR_NTSD_OFFSETOF);
1591 (*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
1592 NDR_NTSD_OFFSETOF);
1593
1594 rc = acl.sd_size;
1595out_free:
1596 kfree(acl_ndr.data);
1597 kfree(smb_acl);
1598 kfree(def_smb_acl);
1599 if (rc < 0) {
1600 kfree(acl.sd_buf);
1601 *pntsd = NULL;
1602 }
1603
1604free_n_data:
1605 kfree(n.data);
1606 return rc;
1607}
1608
1609int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
1610 const struct path *path,
1611 struct xattr_dos_attrib *da,
1612 bool get_write)
1613{
1614 struct ndr n;
1615 int err;
1616
1617 err = ndr_encode_dos_attr(&n, da);
1618 if (err)
1619 return err;
1620
1621 err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
1622 (void *)n.data, n.offset, 0, get_write);
1623 if (err)
1624 ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
1625 kfree(n.data);
1626
1627 return err;
1628}
1629
1630int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
1631 struct dentry *dentry,
1632 struct xattr_dos_attrib *da)
1633{
1634 struct ndr n;
1635 int err;
1636
1637 err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
1638 (char **)&n.data);
1639 if (err > 0) {
1640 n.length = err;
1641 if (ndr_decode_dos_attr(&n, da))
1642 err = -EINVAL;
1643 kfree(n.data);
1644 } else {
1645 ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
1646 }
1647
1648 return err;
1649}
1650
1651/**
1652 * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
1653 * @p: destination buffer
1654 * @ksmbd_kstat: ksmbd kstat wrapper
1655 *
1656 * Returns: pointer to the converted &struct file_directory_info
1657 */
1658void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
1659{
1660 struct file_directory_info *info = (struct file_directory_info *)(*p);
1661 struct kstat *kstat = ksmbd_kstat->kstat;
1662 u64 time;
1663
1664 info->FileIndex = 0;
1665 info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
1666 time = ksmbd_UnixTimeToNT(kstat->atime);
1667 info->LastAccessTime = cpu_to_le64(time);
1668 time = ksmbd_UnixTimeToNT(kstat->mtime);
1669 info->LastWriteTime = cpu_to_le64(time);
1670 time = ksmbd_UnixTimeToNT(kstat->ctime);
1671 info->ChangeTime = cpu_to_le64(time);
1672
1673 if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
1674 info->EndOfFile = 0;
1675 info->AllocationSize = 0;
1676 } else {
1677 info->EndOfFile = cpu_to_le64(kstat->size);
1678 info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
1679 }
1680 info->ExtFileAttributes = ksmbd_kstat->file_attributes;
1681
1682 return info;
1683}
1684
1685int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
1686 struct mnt_idmap *idmap,
1687 struct dentry *dentry,
1688 struct ksmbd_kstat *ksmbd_kstat)
1689{
1690 struct ksmbd_share_config *share_conf = work->tcon->share_conf;
1691 u64 time;
1692 int rc;
1693 struct path path = {
1694 .mnt = share_conf->vfs_path.mnt,
1695 .dentry = dentry,
1696 };
1697
1698 rc = vfs_getattr(&path, ksmbd_kstat->kstat,
1699 STATX_BASIC_STATS | STATX_BTIME,
1700 AT_STATX_SYNC_AS_STAT);
1701 if (rc)
1702 return rc;
1703
1704 time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
1705 ksmbd_kstat->create_time = time;
1706
1707 /*
1708 * set default value for the case that store dos attributes is not yes
1709 * or that acl is disable in server's filesystem and the config is yes.
1710 */
1711 if (S_ISDIR(ksmbd_kstat->kstat->mode))
1712 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
1713 else
1714 ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
1715
1716 if (test_share_config_flag(work->tcon->share_conf,
1717 KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
1718 struct xattr_dos_attrib da;
1719
1720 rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
1721 if (rc > 0) {
1722 ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
1723 ksmbd_kstat->create_time = da.create_time;
1724 } else {
1725 ksmbd_debug(VFS, "fail to load dos attribute.\n");
1726 }
1727 }
1728
1729 return 0;
1730}
1731
1732ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
1733 struct dentry *dentry, char *attr_name,
1734 int attr_name_len)
1735{
1736 char *name, *xattr_list = NULL;
1737 ssize_t value_len = -ENOENT, xattr_list_len;
1738
1739 xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
1740 if (xattr_list_len <= 0)
1741 goto out;
1742
1743 for (name = xattr_list; name - xattr_list < xattr_list_len;
1744 name += strlen(name) + 1) {
1745 ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
1746 if (strncasecmp(attr_name, name, attr_name_len))
1747 continue;
1748
1749 value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
1750 break;
1751 }
1752
1753out:
1754 kvfree(xattr_list);
1755 return value_len;
1756}
1757
1758int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
1759 size_t *xattr_stream_name_size, int s_type)
1760{
1761 char *type, *buf;
1762
1763 if (s_type == DIR_STREAM)
1764 type = ":$INDEX_ALLOCATION";
1765 else
1766 type = ":$DATA";
1767
1768 buf = kasprintf(GFP_KERNEL, "%s%s%s",
1769 XATTR_NAME_STREAM, stream_name, type);
1770 if (!buf)
1771 return -ENOMEM;
1772
1773 *xattr_stream_name = buf;
1774 *xattr_stream_name_size = strlen(buf) + 1;
1775
1776 return 0;
1777}
1778
1779int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
1780 struct ksmbd_file *src_fp,
1781 struct ksmbd_file *dst_fp,
1782 struct srv_copychunk *chunks,
1783 unsigned int chunk_count,
1784 unsigned int *chunk_count_written,
1785 unsigned int *chunk_size_written,
1786 loff_t *total_size_written)
1787{
1788 unsigned int i;
1789 loff_t src_off, dst_off, src_file_size;
1790 size_t len;
1791 int ret;
1792
1793 *chunk_count_written = 0;
1794 *chunk_size_written = 0;
1795 *total_size_written = 0;
1796
1797 if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
1798 pr_err("no right to read(%pD)\n", src_fp->filp);
1799 return -EACCES;
1800 }
1801 if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
1802 pr_err("no right to write(%pD)\n", dst_fp->filp);
1803 return -EACCES;
1804 }
1805
1806 if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
1807 return -EBADF;
1808
1809 smb_break_all_levII_oplock(work, dst_fp, 1);
1810
1811 if (!work->tcon->posix_extensions) {
1812 for (i = 0; i < chunk_count; i++) {
1813 src_off = le64_to_cpu(chunks[i].SourceOffset);
1814 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1815 len = le32_to_cpu(chunks[i].Length);
1816
1817 if (check_lock_range(src_fp->filp, src_off,
1818 src_off + len - 1, READ))
1819 return -EAGAIN;
1820 if (check_lock_range(dst_fp->filp, dst_off,
1821 dst_off + len - 1, WRITE))
1822 return -EAGAIN;
1823 }
1824 }
1825
1826 src_file_size = i_size_read(file_inode(src_fp->filp));
1827
1828 for (i = 0; i < chunk_count; i++) {
1829 src_off = le64_to_cpu(chunks[i].SourceOffset);
1830 dst_off = le64_to_cpu(chunks[i].TargetOffset);
1831 len = le32_to_cpu(chunks[i].Length);
1832
1833 if (src_off + len > src_file_size)
1834 return -E2BIG;
1835
1836 ret = vfs_copy_file_range(src_fp->filp, src_off,
1837 dst_fp->filp, dst_off, len, 0);
1838 if (ret == -EOPNOTSUPP || ret == -EXDEV)
1839 ret = vfs_copy_file_range(src_fp->filp, src_off,
1840 dst_fp->filp, dst_off, len,
1841 COPY_FILE_SPLICE);
1842 if (ret < 0)
1843 return ret;
1844
1845 *chunk_count_written += 1;
1846 *total_size_written += ret;
1847 }
1848 return 0;
1849}
1850
1851void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
1852{
1853 wait_event(flock->c.flc_wait, !flock->c.flc_blocker);
1854}
1855
1856int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
1857{
1858 return wait_event_interruptible_timeout(flock->c.flc_wait,
1859 !flock->c.flc_blocker,
1860 timeout);
1861}
1862
1863void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
1864{
1865 locks_delete_block(flock);
1866}
1867
1868int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
1869 struct path *path)
1870{
1871 struct posix_acl_state acl_state;
1872 struct posix_acl *acls;
1873 struct dentry *dentry = path->dentry;
1874 struct inode *inode = d_inode(dentry);
1875 int rc;
1876
1877 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1878 return -EOPNOTSUPP;
1879
1880 ksmbd_debug(SMB, "Set posix acls\n");
1881 rc = init_acl_state(&acl_state, 1);
1882 if (rc)
1883 return rc;
1884
1885 /* Set default owner group */
1886 acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
1887 acl_state.group.allow = (inode->i_mode & 0070) >> 3;
1888 acl_state.other.allow = inode->i_mode & 0007;
1889 acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
1890 acl_state.users->aces[acl_state.users->n++].perms.allow =
1891 acl_state.owner.allow;
1892 acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
1893 acl_state.groups->aces[acl_state.groups->n++].perms.allow =
1894 acl_state.group.allow;
1895 acl_state.mask.allow = 0x07;
1896
1897 acls = posix_acl_alloc(6, GFP_KERNEL);
1898 if (!acls) {
1899 free_acl_state(&acl_state);
1900 return -ENOMEM;
1901 }
1902 posix_state_to_acl(&acl_state, acls->a_entries);
1903
1904 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1905 if (rc < 0)
1906 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1907 rc);
1908 else if (S_ISDIR(inode->i_mode)) {
1909 posix_state_to_acl(&acl_state, acls->a_entries);
1910 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
1911 if (rc < 0)
1912 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1913 rc);
1914 }
1915
1916 free_acl_state(&acl_state);
1917 posix_acl_release(acls);
1918 return rc;
1919}
1920
1921int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
1922 struct path *path, struct inode *parent_inode)
1923{
1924 struct posix_acl *acls;
1925 struct posix_acl_entry *pace;
1926 struct dentry *dentry = path->dentry;
1927 struct inode *inode = d_inode(dentry);
1928 int rc, i;
1929
1930 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
1931 return -EOPNOTSUPP;
1932
1933 acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
1934 if (IS_ERR_OR_NULL(acls))
1935 return -ENOENT;
1936 pace = acls->a_entries;
1937
1938 for (i = 0; i < acls->a_count; i++, pace++) {
1939 if (pace->e_tag == ACL_MASK) {
1940 pace->e_perm = 0x07;
1941 break;
1942 }
1943 }
1944
1945 rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
1946 if (rc < 0)
1947 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
1948 rc);
1949 if (S_ISDIR(inode->i_mode)) {
1950 rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
1951 acls);
1952 if (rc < 0)
1953 ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
1954 rc);
1955 }
1956
1957 posix_acl_release(acls);
1958 return rc;
1959}