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36#include <linux/reiserfs_fs.h>
37#include <linux/capability.h>
38#include <linux/dcache.h>
39#include <linux/namei.h>
40#include <linux/errno.h>
41#include <linux/gfp.h>
42#include <linux/fs.h>
43#include <linux/file.h>
44#include <linux/pagemap.h>
45#include <linux/xattr.h>
46#include <linux/reiserfs_xattr.h>
47#include <linux/reiserfs_acl.h>
48#include <asm/uaccess.h>
49#include <net/checksum.h>
50#include <linux/stat.h>
51#include <linux/quotaops.h>
52#include <linux/security.h>
53
54#define PRIVROOT_NAME ".reiserfs_priv"
55#define XAROOT_NAME "xattrs"
56
57
58
59
60
61#ifdef CONFIG_REISERFS_FS_XATTR
62static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
63{
64 BUG_ON(!mutex_is_locked(&dir->i_mutex));
65 return dir->i_op->create(dir, dentry, mode, NULL);
66}
67#endif
68
69static int xattr_mkdir(struct inode *dir, struct dentry *dentry, int mode)
70{
71 BUG_ON(!mutex_is_locked(&dir->i_mutex));
72 return dir->i_op->mkdir(dir, dentry, mode);
73}
74
75
76
77
78
79static int xattr_unlink(struct inode *dir, struct dentry *dentry)
80{
81 int error;
82 BUG_ON(!mutex_is_locked(&dir->i_mutex));
83
84 reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex,
85 I_MUTEX_CHILD, dir->i_sb);
86 error = dir->i_op->unlink(dir, dentry);
87 mutex_unlock(&dentry->d_inode->i_mutex);
88
89 if (!error)
90 d_delete(dentry);
91 return error;
92}
93
94static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
95{
96 int error;
97 BUG_ON(!mutex_is_locked(&dir->i_mutex));
98
99 reiserfs_mutex_lock_nested_safe(&dentry->d_inode->i_mutex,
100 I_MUTEX_CHILD, dir->i_sb);
101 dentry_unhash(dentry);
102 error = dir->i_op->rmdir(dir, dentry);
103 if (!error)
104 dentry->d_inode->i_flags |= S_DEAD;
105 mutex_unlock(&dentry->d_inode->i_mutex);
106 if (!error)
107 d_delete(dentry);
108 dput(dentry);
109
110 return error;
111}
112
113#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
114
115static struct dentry *open_xa_root(struct super_block *sb, int flags)
116{
117 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
118 struct dentry *xaroot;
119 if (!privroot->d_inode)
120 return ERR_PTR(-ENODATA);
121
122 mutex_lock_nested(&privroot->d_inode->i_mutex, I_MUTEX_XATTR);
123
124 xaroot = dget(REISERFS_SB(sb)->xattr_root);
125 if (!xaroot)
126 xaroot = ERR_PTR(-ENODATA);
127 else if (!xaroot->d_inode) {
128 int err = -ENODATA;
129 if (xattr_may_create(flags))
130 err = xattr_mkdir(privroot->d_inode, xaroot, 0700);
131 if (err) {
132 dput(xaroot);
133 xaroot = ERR_PTR(err);
134 }
135 }
136
137 mutex_unlock(&privroot->d_inode->i_mutex);
138 return xaroot;
139}
140
141static struct dentry *open_xa_dir(const struct inode *inode, int flags)
142{
143 struct dentry *xaroot, *xadir;
144 char namebuf[17];
145
146 xaroot = open_xa_root(inode->i_sb, flags);
147 if (IS_ERR(xaroot))
148 return xaroot;
149
150 snprintf(namebuf, sizeof(namebuf), "%X.%X",
151 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
152 inode->i_generation);
153
154 mutex_lock_nested(&xaroot->d_inode->i_mutex, I_MUTEX_XATTR);
155
156 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
157 if (!IS_ERR(xadir) && !xadir->d_inode) {
158 int err = -ENODATA;
159 if (xattr_may_create(flags))
160 err = xattr_mkdir(xaroot->d_inode, xadir, 0700);
161 if (err) {
162 dput(xadir);
163 xadir = ERR_PTR(err);
164 }
165 }
166
167 mutex_unlock(&xaroot->d_inode->i_mutex);
168 dput(xaroot);
169 return xadir;
170}
171
172
173
174
175struct reiserfs_dentry_buf {
176 struct dentry *xadir;
177 int count;
178 struct dentry *dentries[8];
179};
180
181static int
182fill_with_dentries(void *buf, const char *name, int namelen, loff_t offset,
183 u64 ino, unsigned int d_type)
184{
185 struct reiserfs_dentry_buf *dbuf = buf;
186 struct dentry *dentry;
187 WARN_ON_ONCE(!mutex_is_locked(&dbuf->xadir->d_inode->i_mutex));
188
189 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
190 return -ENOSPC;
191
192 if (name[0] == '.' && (name[1] == '\0' ||
193 (name[1] == '.' && name[2] == '\0')))
194 return 0;
195
196 dentry = lookup_one_len(name, dbuf->xadir, namelen);
197 if (IS_ERR(dentry)) {
198 return PTR_ERR(dentry);
199 } else if (!dentry->d_inode) {
200
201 reiserfs_error(dentry->d_sb, "xattr-20003",
202 "Corrupted directory: xattr %s listed but "
203 "not found for file %s.\n",
204 dentry->d_name.name, dbuf->xadir->d_name.name);
205 dput(dentry);
206 return -EIO;
207 }
208
209 dbuf->dentries[dbuf->count++] = dentry;
210 return 0;
211}
212
213static void
214cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
215{
216 int i;
217 for (i = 0; i < buf->count; i++)
218 if (buf->dentries[i])
219 dput(buf->dentries[i]);
220}
221
222static int reiserfs_for_each_xattr(struct inode *inode,
223 int (*action)(struct dentry *, void *),
224 void *data)
225{
226 struct dentry *dir;
227 int i, err = 0;
228 loff_t pos = 0;
229 struct reiserfs_dentry_buf buf = {
230 .count = 0,
231 };
232
233
234 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
235 return 0;
236
237 reiserfs_write_unlock(inode->i_sb);
238 dir = open_xa_dir(inode, XATTR_REPLACE);
239 if (IS_ERR(dir)) {
240 err = PTR_ERR(dir);
241 reiserfs_write_lock(inode->i_sb);
242 goto out;
243 } else if (!dir->d_inode) {
244 err = 0;
245 reiserfs_write_lock(inode->i_sb);
246 goto out_dir;
247 }
248
249 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
250
251 reiserfs_write_lock(inode->i_sb);
252
253 buf.xadir = dir;
254 err = reiserfs_readdir_dentry(dir, &buf, fill_with_dentries, &pos);
255 while ((err == 0 || err == -ENOSPC) && buf.count) {
256 err = 0;
257
258 for (i = 0; i < buf.count && buf.dentries[i]; i++) {
259 int lerr = 0;
260 struct dentry *dentry = buf.dentries[i];
261
262 if (err == 0 && !S_ISDIR(dentry->d_inode->i_mode))
263 lerr = action(dentry, data);
264
265 dput(dentry);
266 buf.dentries[i] = NULL;
267 err = lerr ?: err;
268 }
269 buf.count = 0;
270 if (!err)
271 err = reiserfs_readdir_dentry(dir, &buf,
272 fill_with_dentries, &pos);
273 }
274 mutex_unlock(&dir->d_inode->i_mutex);
275
276
277 cleanup_dentry_buf(&buf);
278
279 if (!err) {
280
281
282
283
284
285 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
286 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
287 struct reiserfs_transaction_handle th;
288 err = journal_begin(&th, inode->i_sb, blocks);
289 if (!err) {
290 int jerror;
291 reiserfs_mutex_lock_nested_safe(
292 &dir->d_parent->d_inode->i_mutex,
293 I_MUTEX_XATTR, inode->i_sb);
294 err = action(dir, data);
295 jerror = journal_end(&th, inode->i_sb, blocks);
296 mutex_unlock(&dir->d_parent->d_inode->i_mutex);
297 err = jerror ?: err;
298 }
299 }
300out_dir:
301 dput(dir);
302out:
303
304 if (err == -ENODATA)
305 err = 0;
306 return err;
307}
308
309static int delete_one_xattr(struct dentry *dentry, void *data)
310{
311 struct inode *dir = dentry->d_parent->d_inode;
312
313
314 if (S_ISDIR(dentry->d_inode->i_mode))
315 return xattr_rmdir(dir, dentry);
316
317 return xattr_unlink(dir, dentry);
318}
319
320static int chown_one_xattr(struct dentry *dentry, void *data)
321{
322 struct iattr *attrs = data;
323 return reiserfs_setattr(dentry, attrs);
324}
325
326
327int reiserfs_delete_xattrs(struct inode *inode)
328{
329 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
330 if (err)
331 reiserfs_warning(inode->i_sb, "jdm-20004",
332 "Couldn't delete all xattrs (%d)\n", err);
333 return err;
334}
335
336
337int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
338{
339 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
340 if (err)
341 reiserfs_warning(inode->i_sb, "jdm-20007",
342 "Couldn't chown all xattrs (%d)\n", err);
343 return err;
344}
345
346#ifdef CONFIG_REISERFS_FS_XATTR
347
348
349
350static struct dentry *xattr_lookup(struct inode *inode, const char *name,
351 int flags)
352{
353 struct dentry *xadir, *xafile;
354 int err = 0;
355
356 xadir = open_xa_dir(inode, flags);
357 if (IS_ERR(xadir))
358 return ERR_CAST(xadir);
359
360 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
361 xafile = lookup_one_len(name, xadir, strlen(name));
362 if (IS_ERR(xafile)) {
363 err = PTR_ERR(xafile);
364 goto out;
365 }
366
367 if (xafile->d_inode && (flags & XATTR_CREATE))
368 err = -EEXIST;
369
370 if (!xafile->d_inode) {
371 err = -ENODATA;
372 if (xattr_may_create(flags))
373 err = xattr_create(xadir->d_inode, xafile,
374 0700|S_IFREG);
375 }
376
377 if (err)
378 dput(xafile);
379out:
380 mutex_unlock(&xadir->d_inode->i_mutex);
381 dput(xadir);
382 if (err)
383 return ERR_PTR(err);
384 return xafile;
385}
386
387
388static inline void reiserfs_put_page(struct page *page)
389{
390 kunmap(page);
391 page_cache_release(page);
392}
393
394static struct page *reiserfs_get_page(struct inode *dir, size_t n)
395{
396 struct address_space *mapping = dir->i_mapping;
397 struct page *page;
398
399
400 mapping_set_gfp_mask(mapping, GFP_NOFS);
401 page = read_mapping_page(mapping, n >> PAGE_CACHE_SHIFT, NULL);
402 if (!IS_ERR(page)) {
403 kmap(page);
404 if (PageError(page))
405 goto fail;
406 }
407 return page;
408
409 fail:
410 reiserfs_put_page(page);
411 return ERR_PTR(-EIO);
412}
413
414static inline __u32 xattr_hash(const char *msg, int len)
415{
416 return csum_partial(msg, len, 0);
417}
418
419int reiserfs_commit_write(struct file *f, struct page *page,
420 unsigned from, unsigned to);
421
422static void update_ctime(struct inode *inode)
423{
424 struct timespec now = current_fs_time(inode->i_sb);
425 if (inode_unhashed(inode) || !inode->i_nlink ||
426 timespec_equal(&inode->i_ctime, &now))
427 return;
428
429 inode->i_ctime = CURRENT_TIME_SEC;
430 mark_inode_dirty(inode);
431}
432
433static int lookup_and_delete_xattr(struct inode *inode, const char *name)
434{
435 int err = 0;
436 struct dentry *dentry, *xadir;
437
438 xadir = open_xa_dir(inode, XATTR_REPLACE);
439 if (IS_ERR(xadir))
440 return PTR_ERR(xadir);
441
442 mutex_lock_nested(&xadir->d_inode->i_mutex, I_MUTEX_XATTR);
443 dentry = lookup_one_len(name, xadir, strlen(name));
444 if (IS_ERR(dentry)) {
445 err = PTR_ERR(dentry);
446 goto out_dput;
447 }
448
449 if (dentry->d_inode) {
450 reiserfs_write_lock(inode->i_sb);
451 err = xattr_unlink(xadir->d_inode, dentry);
452 reiserfs_write_unlock(inode->i_sb);
453 update_ctime(inode);
454 }
455
456 dput(dentry);
457out_dput:
458 mutex_unlock(&xadir->d_inode->i_mutex);
459 dput(xadir);
460 return err;
461}
462
463
464
465
466
467
468
469int
470reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
471 struct inode *inode, const char *name,
472 const void *buffer, size_t buffer_size, int flags)
473{
474 int err = 0;
475 struct dentry *dentry;
476 struct page *page;
477 char *data;
478 size_t file_pos = 0;
479 size_t buffer_pos = 0;
480 size_t new_size;
481 __u32 xahash = 0;
482
483 if (get_inode_sd_version(inode) == STAT_DATA_V1)
484 return -EOPNOTSUPP;
485
486 reiserfs_write_unlock(inode->i_sb);
487
488 if (!buffer) {
489 err = lookup_and_delete_xattr(inode, name);
490 reiserfs_write_lock(inode->i_sb);
491 return err;
492 }
493
494 dentry = xattr_lookup(inode, name, flags);
495 if (IS_ERR(dentry)) {
496 reiserfs_write_lock(inode->i_sb);
497 return PTR_ERR(dentry);
498 }
499
500 down_write(&REISERFS_I(inode)->i_xattr_sem);
501
502 reiserfs_write_lock(inode->i_sb);
503
504 xahash = xattr_hash(buffer, buffer_size);
505 while (buffer_pos < buffer_size || buffer_pos == 0) {
506 size_t chunk;
507 size_t skip = 0;
508 size_t page_offset = (file_pos & (PAGE_CACHE_SIZE - 1));
509 if (buffer_size - buffer_pos > PAGE_CACHE_SIZE)
510 chunk = PAGE_CACHE_SIZE;
511 else
512 chunk = buffer_size - buffer_pos;
513
514 page = reiserfs_get_page(dentry->d_inode, file_pos);
515 if (IS_ERR(page)) {
516 err = PTR_ERR(page);
517 goto out_unlock;
518 }
519
520 lock_page(page);
521 data = page_address(page);
522
523 if (file_pos == 0) {
524 struct reiserfs_xattr_header *rxh;
525 skip = file_pos = sizeof(struct reiserfs_xattr_header);
526 if (chunk + skip > PAGE_CACHE_SIZE)
527 chunk = PAGE_CACHE_SIZE - skip;
528 rxh = (struct reiserfs_xattr_header *)data;
529 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
530 rxh->h_hash = cpu_to_le32(xahash);
531 }
532
533 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
534 if (!err) {
535 if (buffer)
536 memcpy(data + skip, buffer + buffer_pos, chunk);
537 err = reiserfs_commit_write(NULL, page, page_offset,
538 page_offset + chunk +
539 skip);
540 }
541 unlock_page(page);
542 reiserfs_put_page(page);
543 buffer_pos += chunk;
544 file_pos += chunk;
545 skip = 0;
546 if (err || buffer_size == 0 || !buffer)
547 break;
548 }
549
550 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
551 if (!err && new_size < i_size_read(dentry->d_inode)) {
552 struct iattr newattrs = {
553 .ia_ctime = current_fs_time(inode->i_sb),
554 .ia_size = new_size,
555 .ia_valid = ATTR_SIZE | ATTR_CTIME,
556 };
557
558 reiserfs_write_unlock(inode->i_sb);
559 mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_XATTR);
560 down_write(&dentry->d_inode->i_alloc_sem);
561 reiserfs_write_lock(inode->i_sb);
562
563 err = reiserfs_setattr(dentry, &newattrs);
564 up_write(&dentry->d_inode->i_alloc_sem);
565 mutex_unlock(&dentry->d_inode->i_mutex);
566 } else
567 update_ctime(inode);
568out_unlock:
569 up_write(&REISERFS_I(inode)->i_xattr_sem);
570 dput(dentry);
571 return err;
572}
573
574
575int reiserfs_xattr_set(struct inode *inode, const char *name,
576 const void *buffer, size_t buffer_size, int flags)
577{
578
579 struct reiserfs_transaction_handle th;
580 int error, error2;
581 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
582
583 if (!(flags & XATTR_REPLACE))
584 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
585
586 reiserfs_write_lock(inode->i_sb);
587 error = journal_begin(&th, inode->i_sb, jbegin_count);
588 if (error) {
589 reiserfs_write_unlock(inode->i_sb);
590 return error;
591 }
592
593 error = reiserfs_xattr_set_handle(&th, inode, name,
594 buffer, buffer_size, flags);
595
596 error2 = journal_end(&th, inode->i_sb, jbegin_count);
597 if (error == 0)
598 error = error2;
599 reiserfs_write_unlock(inode->i_sb);
600
601 return error;
602}
603
604
605
606
607int
608reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
609 size_t buffer_size)
610{
611 ssize_t err = 0;
612 struct dentry *dentry;
613 size_t isize;
614 size_t file_pos = 0;
615 size_t buffer_pos = 0;
616 struct page *page;
617 __u32 hash = 0;
618
619 if (name == NULL)
620 return -EINVAL;
621
622
623
624 if (get_inode_sd_version(inode) == STAT_DATA_V1)
625 return -EOPNOTSUPP;
626
627 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
628 if (IS_ERR(dentry)) {
629 err = PTR_ERR(dentry);
630 goto out;
631 }
632
633 down_read(&REISERFS_I(inode)->i_xattr_sem);
634
635 isize = i_size_read(dentry->d_inode);
636
637
638 if (buffer == NULL) {
639 err = isize - sizeof(struct reiserfs_xattr_header);
640 goto out_unlock;
641 }
642
643 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
644 err = -ERANGE;
645 goto out_unlock;
646 }
647
648 while (file_pos < isize) {
649 size_t chunk;
650 char *data;
651 size_t skip = 0;
652 if (isize - file_pos > PAGE_CACHE_SIZE)
653 chunk = PAGE_CACHE_SIZE;
654 else
655 chunk = isize - file_pos;
656
657 page = reiserfs_get_page(dentry->d_inode, file_pos);
658 if (IS_ERR(page)) {
659 err = PTR_ERR(page);
660 goto out_unlock;
661 }
662
663 lock_page(page);
664 data = page_address(page);
665 if (file_pos == 0) {
666 struct reiserfs_xattr_header *rxh =
667 (struct reiserfs_xattr_header *)data;
668 skip = file_pos = sizeof(struct reiserfs_xattr_header);
669 chunk -= skip;
670
671 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
672 unlock_page(page);
673 reiserfs_put_page(page);
674 reiserfs_warning(inode->i_sb, "jdm-20001",
675 "Invalid magic for xattr (%s) "
676 "associated with %k", name,
677 INODE_PKEY(inode));
678 err = -EIO;
679 goto out_unlock;
680 }
681 hash = le32_to_cpu(rxh->h_hash);
682 }
683 memcpy(buffer + buffer_pos, data + skip, chunk);
684 unlock_page(page);
685 reiserfs_put_page(page);
686 file_pos += chunk;
687 buffer_pos += chunk;
688 skip = 0;
689 }
690 err = isize - sizeof(struct reiserfs_xattr_header);
691
692 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
693 hash) {
694 reiserfs_warning(inode->i_sb, "jdm-20002",
695 "Invalid hash for xattr (%s) associated "
696 "with %k", name, INODE_PKEY(inode));
697 err = -EIO;
698 }
699
700out_unlock:
701 up_read(&REISERFS_I(inode)->i_xattr_sem);
702 dput(dentry);
703
704out:
705 return err;
706}
707
708
709
710
711
712
713
714
715
716
717#define for_each_xattr_handler(handlers, handler) \
718 for ((handler) = *(handlers)++; \
719 (handler) != NULL; \
720 (handler) = *(handlers)++)
721
722
723static inline const struct xattr_handler *
724find_xattr_handler_prefix(const struct xattr_handler **handlers,
725 const char *name)
726{
727 const struct xattr_handler *xah;
728
729 if (!handlers)
730 return NULL;
731
732 for_each_xattr_handler(handlers, xah) {
733 if (strncmp(xah->prefix, name, strlen(xah->prefix)) == 0)
734 break;
735 }
736
737 return xah;
738}
739
740
741
742
743
744ssize_t
745reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
746 size_t size)
747{
748 const struct xattr_handler *handler;
749
750 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
751
752 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
753 return -EOPNOTSUPP;
754
755 return handler->get(dentry, name, buffer, size, handler->flags);
756}
757
758
759
760
761
762
763int
764reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
765 size_t size, int flags)
766{
767 const struct xattr_handler *handler;
768
769 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
770
771 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
772 return -EOPNOTSUPP;
773
774 return handler->set(dentry, name, value, size, flags, handler->flags);
775}
776
777
778
779
780
781
782int reiserfs_removexattr(struct dentry *dentry, const char *name)
783{
784 const struct xattr_handler *handler;
785 handler = find_xattr_handler_prefix(dentry->d_sb->s_xattr, name);
786
787 if (!handler || get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
788 return -EOPNOTSUPP;
789
790 return handler->set(dentry, name, NULL, 0, XATTR_REPLACE, handler->flags);
791}
792
793struct listxattr_buf {
794 size_t size;
795 size_t pos;
796 char *buf;
797 struct dentry *dentry;
798};
799
800static int listxattr_filler(void *buf, const char *name, int namelen,
801 loff_t offset, u64 ino, unsigned int d_type)
802{
803 struct listxattr_buf *b = (struct listxattr_buf *)buf;
804 size_t size;
805 if (name[0] != '.' ||
806 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
807 const struct xattr_handler *handler;
808 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
809 name);
810 if (!handler)
811 return 0;
812 if (b->buf) {
813 size = handler->list(b->dentry, b->buf + b->pos,
814 b->size, name, namelen,
815 handler->flags);
816 if (size > b->size)
817 return -ERANGE;
818 } else {
819 size = handler->list(b->dentry, NULL, 0, name,
820 namelen, handler->flags);
821 }
822
823 b->pos += size;
824 }
825 return 0;
826}
827
828
829
830
831
832
833
834
835ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
836{
837 struct dentry *dir;
838 int err = 0;
839 loff_t pos = 0;
840 struct listxattr_buf buf = {
841 .dentry = dentry,
842 .buf = buffer,
843 .size = buffer ? size : 0,
844 };
845
846 if (!dentry->d_inode)
847 return -EINVAL;
848
849 if (!dentry->d_sb->s_xattr ||
850 get_inode_sd_version(dentry->d_inode) == STAT_DATA_V1)
851 return -EOPNOTSUPP;
852
853 dir = open_xa_dir(dentry->d_inode, XATTR_REPLACE);
854 if (IS_ERR(dir)) {
855 err = PTR_ERR(dir);
856 if (err == -ENODATA)
857 err = 0;
858 goto out;
859 }
860
861 mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_XATTR);
862 err = reiserfs_readdir_dentry(dir, &buf, listxattr_filler, &pos);
863 mutex_unlock(&dir->d_inode->i_mutex);
864
865 if (!err)
866 err = buf.pos;
867
868 dput(dir);
869out:
870 return err;
871}
872
873static int reiserfs_check_acl(struct inode *inode, int mask, unsigned int flags)
874{
875 struct posix_acl *acl;
876 int error = -EAGAIN;
877
878 if (flags & IPERM_FLAG_RCU)
879 return -ECHILD;
880
881 acl = reiserfs_get_acl(inode, ACL_TYPE_ACCESS);
882
883 if (acl) {
884 if (!IS_ERR(acl)) {
885 error = posix_acl_permission(inode, acl, mask);
886 posix_acl_release(acl);
887 } else if (PTR_ERR(acl) != -ENODATA)
888 error = PTR_ERR(acl);
889 }
890
891 return error;
892}
893
894static int create_privroot(struct dentry *dentry)
895{
896 int err;
897 struct inode *inode = dentry->d_parent->d_inode;
898 WARN_ON_ONCE(!mutex_is_locked(&inode->i_mutex));
899
900 err = xattr_mkdir(inode, dentry, 0700);
901 if (err || !dentry->d_inode) {
902 reiserfs_warning(dentry->d_sb, "jdm-20006",
903 "xattrs/ACLs enabled and couldn't "
904 "find/create .reiserfs_priv. "
905 "Failing mount.");
906 return -EOPNOTSUPP;
907 }
908
909 dentry->d_inode->i_flags |= S_PRIVATE;
910 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
911 "storage.\n", PRIVROOT_NAME);
912
913 return 0;
914}
915
916#else
917int __init reiserfs_xattr_register_handlers(void) { return 0; }
918void reiserfs_xattr_unregister_handlers(void) {}
919static int create_privroot(struct dentry *dentry) { return 0; }
920#endif
921
922
923const struct xattr_handler *reiserfs_xattr_handlers[] = {
924#ifdef CONFIG_REISERFS_FS_XATTR
925 &reiserfs_xattr_user_handler,
926 &reiserfs_xattr_trusted_handler,
927#endif
928#ifdef CONFIG_REISERFS_FS_SECURITY
929 &reiserfs_xattr_security_handler,
930#endif
931#ifdef CONFIG_REISERFS_FS_POSIX_ACL
932 &reiserfs_posix_acl_access_handler,
933 &reiserfs_posix_acl_default_handler,
934#endif
935 NULL
936};
937
938static int xattr_mount_check(struct super_block *s)
939{
940
941
942 if (old_format_only(s)) {
943 if (reiserfs_xattrs_optional(s)) {
944
945
946 reiserfs_warning(s, "jdm-2005",
947 "xattrs/ACLs not supported "
948 "on pre-v3.6 format filesystems. "
949 "Failing mount.");
950 return -EOPNOTSUPP;
951 }
952 }
953
954 return 0;
955}
956
957int reiserfs_permission(struct inode *inode, int mask, unsigned int flags)
958{
959 if (flags & IPERM_FLAG_RCU)
960 return -ECHILD;
961
962
963
964
965 if (IS_PRIVATE(inode))
966 return 0;
967
968#ifdef CONFIG_REISERFS_FS_XATTR
969
970
971
972 if (get_inode_sd_version(inode) != STAT_DATA_V1)
973 return generic_permission(inode, mask, flags,
974 reiserfs_check_acl);
975#endif
976 return generic_permission(inode, mask, flags, NULL);
977}
978
979static int xattr_hide_revalidate(struct dentry *dentry, struct nameidata *nd)
980{
981 return -EPERM;
982}
983
984static const struct dentry_operations xattr_lookup_poison_ops = {
985 .d_revalidate = xattr_hide_revalidate,
986};
987
988int reiserfs_lookup_privroot(struct super_block *s)
989{
990 struct dentry *dentry;
991 int err = 0;
992
993
994 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
995 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
996 strlen(PRIVROOT_NAME));
997 if (!IS_ERR(dentry)) {
998 REISERFS_SB(s)->priv_root = dentry;
999 d_set_d_op(dentry, &xattr_lookup_poison_ops);
1000 if (dentry->d_inode)
1001 dentry->d_inode->i_flags |= S_PRIVATE;
1002 } else
1003 err = PTR_ERR(dentry);
1004 mutex_unlock(&s->s_root->d_inode->i_mutex);
1005
1006 return err;
1007}
1008
1009
1010
1011
1012int reiserfs_xattr_init(struct super_block *s, int mount_flags)
1013{
1014 int err = 0;
1015 struct dentry *privroot = REISERFS_SB(s)->priv_root;
1016
1017 err = xattr_mount_check(s);
1018 if (err)
1019 goto error;
1020
1021 if (!privroot->d_inode && !(mount_flags & MS_RDONLY)) {
1022 reiserfs_mutex_lock_safe(&s->s_root->d_inode->i_mutex, s);
1023 err = create_privroot(REISERFS_SB(s)->priv_root);
1024 mutex_unlock(&s->s_root->d_inode->i_mutex);
1025 }
1026
1027 if (privroot->d_inode) {
1028 s->s_xattr = reiserfs_xattr_handlers;
1029 reiserfs_mutex_lock_safe(&privroot->d_inode->i_mutex, s);
1030 if (!REISERFS_SB(s)->xattr_root) {
1031 struct dentry *dentry;
1032 dentry = lookup_one_len(XAROOT_NAME, privroot,
1033 strlen(XAROOT_NAME));
1034 if (!IS_ERR(dentry))
1035 REISERFS_SB(s)->xattr_root = dentry;
1036 else
1037 err = PTR_ERR(dentry);
1038 }
1039 mutex_unlock(&privroot->d_inode->i_mutex);
1040 }
1041
1042error:
1043 if (err) {
1044 clear_bit(REISERFS_XATTRS_USER, &(REISERFS_SB(s)->s_mount_opt));
1045 clear_bit(REISERFS_POSIXACL, &(REISERFS_SB(s)->s_mount_opt));
1046 }
1047
1048
1049 if (reiserfs_posixacl(s))
1050 s->s_flags |= MS_POSIXACL;
1051 else
1052 s->s_flags &= ~MS_POSIXACL;
1053
1054 return err;
1055}
1056