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37#include "reiserfs.h"
38#include <linux/capability.h>
39#include <linux/dcache.h>
40#include <linux/namei.h>
41#include <linux/errno.h>
42#include <linux/gfp.h>
43#include <linux/fs.h>
44#include <linux/file.h>
45#include <linux/pagemap.h>
46#include <linux/xattr.h>
47#include "xattr.h"
48#include "acl.h"
49#include <linux/uaccess.h>
50#include <net/checksum.h>
51#include <linux/stat.h>
52#include <linux/quotaops.h>
53#include <linux/security.h>
54#include <linux/posix_acl_xattr.h>
55
56#define PRIVROOT_NAME ".reiserfs_priv"
57#define XAROOT_NAME "xattrs"
58
59
60
61
62
63
64
65#ifdef CONFIG_REISERFS_FS_XATTR
66static int xattr_create(struct inode *dir, struct dentry *dentry, int mode)
67{
68 BUG_ON(!inode_is_locked(dir));
69 return dir->i_op->create(dir, dentry, mode, true);
70}
71#endif
72
73static int xattr_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
74{
75 BUG_ON(!inode_is_locked(dir));
76 return dir->i_op->mkdir(dir, dentry, mode);
77}
78
79
80
81
82
83
84
85static int xattr_unlink(struct inode *dir, struct dentry *dentry)
86{
87 int error;
88
89 BUG_ON(!inode_is_locked(dir));
90
91 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
92 error = dir->i_op->unlink(dir, dentry);
93 inode_unlock(d_inode(dentry));
94
95 if (!error)
96 d_delete(dentry);
97 return error;
98}
99
100static int xattr_rmdir(struct inode *dir, struct dentry *dentry)
101{
102 int error;
103
104 BUG_ON(!inode_is_locked(dir));
105
106 inode_lock_nested(d_inode(dentry), I_MUTEX_CHILD);
107 error = dir->i_op->rmdir(dir, dentry);
108 if (!error)
109 d_inode(dentry)->i_flags |= S_DEAD;
110 inode_unlock(d_inode(dentry));
111 if (!error)
112 d_delete(dentry);
113
114 return error;
115}
116
117#define xattr_may_create(flags) (!flags || flags & XATTR_CREATE)
118
119static struct dentry *open_xa_root(struct super_block *sb, int flags)
120{
121 struct dentry *privroot = REISERFS_SB(sb)->priv_root;
122 struct dentry *xaroot;
123
124 if (d_really_is_negative(privroot))
125 return ERR_PTR(-ENODATA);
126
127 inode_lock_nested(d_inode(privroot), I_MUTEX_XATTR);
128
129 xaroot = dget(REISERFS_SB(sb)->xattr_root);
130 if (!xaroot)
131 xaroot = ERR_PTR(-ENODATA);
132 else if (d_really_is_negative(xaroot)) {
133 int err = -ENODATA;
134
135 if (xattr_may_create(flags))
136 err = xattr_mkdir(d_inode(privroot), xaroot, 0700);
137 if (err) {
138 dput(xaroot);
139 xaroot = ERR_PTR(err);
140 }
141 }
142
143 inode_unlock(d_inode(privroot));
144 return xaroot;
145}
146
147static struct dentry *open_xa_dir(const struct inode *inode, int flags)
148{
149 struct dentry *xaroot, *xadir;
150 char namebuf[17];
151
152 xaroot = open_xa_root(inode->i_sb, flags);
153 if (IS_ERR(xaroot))
154 return xaroot;
155
156 snprintf(namebuf, sizeof(namebuf), "%X.%X",
157 le32_to_cpu(INODE_PKEY(inode)->k_objectid),
158 inode->i_generation);
159
160 inode_lock_nested(d_inode(xaroot), I_MUTEX_XATTR);
161
162 xadir = lookup_one_len(namebuf, xaroot, strlen(namebuf));
163 if (!IS_ERR(xadir) && d_really_is_negative(xadir)) {
164 int err = -ENODATA;
165
166 if (xattr_may_create(flags))
167 err = xattr_mkdir(d_inode(xaroot), xadir, 0700);
168 if (err) {
169 dput(xadir);
170 xadir = ERR_PTR(err);
171 }
172 }
173
174 inode_unlock(d_inode(xaroot));
175 dput(xaroot);
176 return xadir;
177}
178
179
180
181
182
183
184struct reiserfs_dentry_buf {
185 struct dir_context ctx;
186 struct dentry *xadir;
187 int count;
188 int err;
189 struct dentry *dentries[8];
190};
191
192static int
193fill_with_dentries(struct dir_context *ctx, const char *name, int namelen,
194 loff_t offset, u64 ino, unsigned int d_type)
195{
196 struct reiserfs_dentry_buf *dbuf =
197 container_of(ctx, struct reiserfs_dentry_buf, ctx);
198 struct dentry *dentry;
199
200 WARN_ON_ONCE(!inode_is_locked(d_inode(dbuf->xadir)));
201
202 if (dbuf->count == ARRAY_SIZE(dbuf->dentries))
203 return -ENOSPC;
204
205 if (name[0] == '.' && (namelen < 2 ||
206 (namelen == 2 && name[1] == '.')))
207 return 0;
208
209 dentry = lookup_one_len(name, dbuf->xadir, namelen);
210 if (IS_ERR(dentry)) {
211 dbuf->err = PTR_ERR(dentry);
212 return PTR_ERR(dentry);
213 } else if (d_really_is_negative(dentry)) {
214
215 reiserfs_error(dentry->d_sb, "xattr-20003",
216 "Corrupted directory: xattr %pd listed but "
217 "not found for file %pd.\n",
218 dentry, dbuf->xadir);
219 dput(dentry);
220 dbuf->err = -EIO;
221 return -EIO;
222 }
223
224 dbuf->dentries[dbuf->count++] = dentry;
225 return 0;
226}
227
228static void
229cleanup_dentry_buf(struct reiserfs_dentry_buf *buf)
230{
231 int i;
232
233 for (i = 0; i < buf->count; i++)
234 if (buf->dentries[i])
235 dput(buf->dentries[i]);
236}
237
238static int reiserfs_for_each_xattr(struct inode *inode,
239 int (*action)(struct dentry *, void *),
240 void *data)
241{
242 struct dentry *dir;
243 int i, err = 0;
244 struct reiserfs_dentry_buf buf = {
245 .ctx.actor = fill_with_dentries,
246 };
247
248
249 if (IS_PRIVATE(inode) || get_inode_sd_version(inode) == STAT_DATA_V1)
250 return 0;
251
252 dir = open_xa_dir(inode, XATTR_REPLACE);
253 if (IS_ERR(dir)) {
254 err = PTR_ERR(dir);
255 goto out;
256 } else if (d_really_is_negative(dir)) {
257 err = 0;
258 goto out_dir;
259 }
260
261 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
262
263 buf.xadir = dir;
264 while (1) {
265 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
266 if (err)
267 break;
268 if (buf.err) {
269 err = buf.err;
270 break;
271 }
272 if (!buf.count)
273 break;
274 for (i = 0; !err && i < buf.count && buf.dentries[i]; i++) {
275 struct dentry *dentry = buf.dentries[i];
276
277 if (!d_is_dir(dentry))
278 err = action(dentry, data);
279
280 dput(dentry);
281 buf.dentries[i] = NULL;
282 }
283 if (err)
284 break;
285 buf.count = 0;
286 }
287 inode_unlock(d_inode(dir));
288
289 cleanup_dentry_buf(&buf);
290
291 if (!err) {
292
293
294
295
296
297
298
299 int blocks = JOURNAL_PER_BALANCE_CNT * 2 + 2 +
300 4 * REISERFS_QUOTA_TRANS_BLOCKS(inode->i_sb);
301 struct reiserfs_transaction_handle th;
302
303 reiserfs_write_lock(inode->i_sb);
304 err = journal_begin(&th, inode->i_sb, blocks);
305 reiserfs_write_unlock(inode->i_sb);
306 if (!err) {
307 int jerror;
308
309 inode_lock_nested(d_inode(dir->d_parent),
310 I_MUTEX_XATTR);
311 err = action(dir, data);
312 reiserfs_write_lock(inode->i_sb);
313 jerror = journal_end(&th);
314 reiserfs_write_unlock(inode->i_sb);
315 inode_unlock(d_inode(dir->d_parent));
316 err = jerror ?: err;
317 }
318 }
319out_dir:
320 dput(dir);
321out:
322
323 if (err == -ENODATA)
324 err = 0;
325 return err;
326}
327
328static int delete_one_xattr(struct dentry *dentry, void *data)
329{
330 struct inode *dir = d_inode(dentry->d_parent);
331
332
333 if (d_is_dir(dentry))
334 return xattr_rmdir(dir, dentry);
335
336 return xattr_unlink(dir, dentry);
337}
338
339static int chown_one_xattr(struct dentry *dentry, void *data)
340{
341 struct iattr *attrs = data;
342 int ia_valid = attrs->ia_valid;
343 int err;
344
345
346
347
348
349
350 attrs->ia_valid &= (ATTR_UID|ATTR_GID);
351 err = reiserfs_setattr(dentry, attrs);
352 attrs->ia_valid = ia_valid;
353
354 return err;
355}
356
357
358int reiserfs_delete_xattrs(struct inode *inode)
359{
360 int err = reiserfs_for_each_xattr(inode, delete_one_xattr, NULL);
361
362 if (err)
363 reiserfs_warning(inode->i_sb, "jdm-20004",
364 "Couldn't delete all xattrs (%d)\n", err);
365 return err;
366}
367
368
369int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
370{
371 int err = reiserfs_for_each_xattr(inode, chown_one_xattr, attrs);
372
373 if (err)
374 reiserfs_warning(inode->i_sb, "jdm-20007",
375 "Couldn't chown all xattrs (%d)\n", err);
376 return err;
377}
378
379#ifdef CONFIG_REISERFS_FS_XATTR
380
381
382
383
384
385static struct dentry *xattr_lookup(struct inode *inode, const char *name,
386 int flags)
387{
388 struct dentry *xadir, *xafile;
389 int err = 0;
390
391 xadir = open_xa_dir(inode, flags);
392 if (IS_ERR(xadir))
393 return ERR_CAST(xadir);
394
395 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
396 xafile = lookup_one_len(name, xadir, strlen(name));
397 if (IS_ERR(xafile)) {
398 err = PTR_ERR(xafile);
399 goto out;
400 }
401
402 if (d_really_is_positive(xafile) && (flags & XATTR_CREATE))
403 err = -EEXIST;
404
405 if (d_really_is_negative(xafile)) {
406 err = -ENODATA;
407 if (xattr_may_create(flags))
408 err = xattr_create(d_inode(xadir), xafile,
409 0700|S_IFREG);
410 }
411
412 if (err)
413 dput(xafile);
414out:
415 inode_unlock(d_inode(xadir));
416 dput(xadir);
417 if (err)
418 return ERR_PTR(err);
419 return xafile;
420}
421
422
423static inline void reiserfs_put_page(struct page *page)
424{
425 kunmap(page);
426 put_page(page);
427}
428
429static struct page *reiserfs_get_page(struct inode *dir, size_t n)
430{
431 struct address_space *mapping = dir->i_mapping;
432 struct page *page;
433
434
435
436
437 mapping_set_gfp_mask(mapping, GFP_NOFS);
438 page = read_mapping_page(mapping, n >> PAGE_SHIFT, NULL);
439 if (!IS_ERR(page)) {
440 kmap(page);
441 if (PageError(page))
442 goto fail;
443 }
444 return page;
445
446fail:
447 reiserfs_put_page(page);
448 return ERR_PTR(-EIO);
449}
450
451static inline __u32 xattr_hash(const char *msg, int len)
452{
453
454
455
456
457
458
459
460
461
462 return csum_partial(msg, len, 0);
463}
464
465int reiserfs_commit_write(struct file *f, struct page *page,
466 unsigned from, unsigned to);
467
468static void update_ctime(struct inode *inode)
469{
470 struct timespec64 now = current_time(inode);
471
472 if (inode_unhashed(inode) || !inode->i_nlink ||
473 timespec64_equal(&inode->i_ctime, &now))
474 return;
475
476 inode->i_ctime = current_time(inode);
477 mark_inode_dirty(inode);
478}
479
480static int lookup_and_delete_xattr(struct inode *inode, const char *name)
481{
482 int err = 0;
483 struct dentry *dentry, *xadir;
484
485 xadir = open_xa_dir(inode, XATTR_REPLACE);
486 if (IS_ERR(xadir))
487 return PTR_ERR(xadir);
488
489 inode_lock_nested(d_inode(xadir), I_MUTEX_XATTR);
490 dentry = lookup_one_len(name, xadir, strlen(name));
491 if (IS_ERR(dentry)) {
492 err = PTR_ERR(dentry);
493 goto out_dput;
494 }
495
496 if (d_really_is_positive(dentry)) {
497 err = xattr_unlink(d_inode(xadir), dentry);
498 update_ctime(inode);
499 }
500
501 dput(dentry);
502out_dput:
503 inode_unlock(d_inode(xadir));
504 dput(xadir);
505 return err;
506}
507
508
509
510
511
512
513
514int
515reiserfs_xattr_set_handle(struct reiserfs_transaction_handle *th,
516 struct inode *inode, const char *name,
517 const void *buffer, size_t buffer_size, int flags)
518{
519 int err = 0;
520 struct dentry *dentry;
521 struct page *page;
522 char *data;
523 size_t file_pos = 0;
524 size_t buffer_pos = 0;
525 size_t new_size;
526 __u32 xahash = 0;
527
528 if (get_inode_sd_version(inode) == STAT_DATA_V1)
529 return -EOPNOTSUPP;
530
531 if (!buffer) {
532 err = lookup_and_delete_xattr(inode, name);
533 return err;
534 }
535
536 dentry = xattr_lookup(inode, name, flags);
537 if (IS_ERR(dentry))
538 return PTR_ERR(dentry);
539
540 down_write(&REISERFS_I(inode)->i_xattr_sem);
541
542 xahash = xattr_hash(buffer, buffer_size);
543 while (buffer_pos < buffer_size || buffer_pos == 0) {
544 size_t chunk;
545 size_t skip = 0;
546 size_t page_offset = (file_pos & (PAGE_SIZE - 1));
547
548 if (buffer_size - buffer_pos > PAGE_SIZE)
549 chunk = PAGE_SIZE;
550 else
551 chunk = buffer_size - buffer_pos;
552
553 page = reiserfs_get_page(d_inode(dentry), file_pos);
554 if (IS_ERR(page)) {
555 err = PTR_ERR(page);
556 goto out_unlock;
557 }
558
559 lock_page(page);
560 data = page_address(page);
561
562 if (file_pos == 0) {
563 struct reiserfs_xattr_header *rxh;
564
565 skip = file_pos = sizeof(struct reiserfs_xattr_header);
566 if (chunk + skip > PAGE_SIZE)
567 chunk = PAGE_SIZE - skip;
568 rxh = (struct reiserfs_xattr_header *)data;
569 rxh->h_magic = cpu_to_le32(REISERFS_XATTR_MAGIC);
570 rxh->h_hash = cpu_to_le32(xahash);
571 }
572
573 reiserfs_write_lock(inode->i_sb);
574 err = __reiserfs_write_begin(page, page_offset, chunk + skip);
575 if (!err) {
576 if (buffer)
577 memcpy(data + skip, buffer + buffer_pos, chunk);
578 err = reiserfs_commit_write(NULL, page, page_offset,
579 page_offset + chunk +
580 skip);
581 }
582 reiserfs_write_unlock(inode->i_sb);
583 unlock_page(page);
584 reiserfs_put_page(page);
585 buffer_pos += chunk;
586 file_pos += chunk;
587 skip = 0;
588 if (err || buffer_size == 0 || !buffer)
589 break;
590 }
591
592 new_size = buffer_size + sizeof(struct reiserfs_xattr_header);
593 if (!err && new_size < i_size_read(d_inode(dentry))) {
594 struct iattr newattrs = {
595 .ia_ctime = current_time(inode),
596 .ia_size = new_size,
597 .ia_valid = ATTR_SIZE | ATTR_CTIME,
598 };
599
600 inode_lock_nested(d_inode(dentry), I_MUTEX_XATTR);
601 inode_dio_wait(d_inode(dentry));
602
603 err = reiserfs_setattr(dentry, &newattrs);
604 inode_unlock(d_inode(dentry));
605 } else
606 update_ctime(inode);
607out_unlock:
608 up_write(&REISERFS_I(inode)->i_xattr_sem);
609 dput(dentry);
610 return err;
611}
612
613
614int reiserfs_xattr_set(struct inode *inode, const char *name,
615 const void *buffer, size_t buffer_size, int flags)
616{
617
618 struct reiserfs_transaction_handle th;
619 int error, error2;
620 size_t jbegin_count = reiserfs_xattr_nblocks(inode, buffer_size);
621
622 if (!(flags & XATTR_REPLACE))
623 jbegin_count += reiserfs_xattr_jcreate_nblocks(inode);
624
625 reiserfs_write_lock(inode->i_sb);
626 error = journal_begin(&th, inode->i_sb, jbegin_count);
627 reiserfs_write_unlock(inode->i_sb);
628 if (error) {
629 return error;
630 }
631
632 error = reiserfs_xattr_set_handle(&th, inode, name,
633 buffer, buffer_size, flags);
634
635 reiserfs_write_lock(inode->i_sb);
636 error2 = journal_end(&th);
637 reiserfs_write_unlock(inode->i_sb);
638 if (error == 0)
639 error = error2;
640
641 return error;
642}
643
644
645
646
647int
648reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
649 size_t buffer_size)
650{
651 ssize_t err = 0;
652 struct dentry *dentry;
653 size_t isize;
654 size_t file_pos = 0;
655 size_t buffer_pos = 0;
656 struct page *page;
657 __u32 hash = 0;
658
659 if (name == NULL)
660 return -EINVAL;
661
662
663
664
665
666 if (get_inode_sd_version(inode) == STAT_DATA_V1)
667 return -EOPNOTSUPP;
668
669 dentry = xattr_lookup(inode, name, XATTR_REPLACE);
670 if (IS_ERR(dentry)) {
671 err = PTR_ERR(dentry);
672 goto out;
673 }
674
675 down_read(&REISERFS_I(inode)->i_xattr_sem);
676
677 isize = i_size_read(d_inode(dentry));
678
679
680 if (buffer == NULL) {
681 err = isize - sizeof(struct reiserfs_xattr_header);
682 goto out_unlock;
683 }
684
685 if (buffer_size < isize - sizeof(struct reiserfs_xattr_header)) {
686 err = -ERANGE;
687 goto out_unlock;
688 }
689
690 while (file_pos < isize) {
691 size_t chunk;
692 char *data;
693 size_t skip = 0;
694
695 if (isize - file_pos > PAGE_SIZE)
696 chunk = PAGE_SIZE;
697 else
698 chunk = isize - file_pos;
699
700 page = reiserfs_get_page(d_inode(dentry), file_pos);
701 if (IS_ERR(page)) {
702 err = PTR_ERR(page);
703 goto out_unlock;
704 }
705
706 lock_page(page);
707 data = page_address(page);
708 if (file_pos == 0) {
709 struct reiserfs_xattr_header *rxh =
710 (struct reiserfs_xattr_header *)data;
711 skip = file_pos = sizeof(struct reiserfs_xattr_header);
712 chunk -= skip;
713
714 if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
715 unlock_page(page);
716 reiserfs_put_page(page);
717 reiserfs_warning(inode->i_sb, "jdm-20001",
718 "Invalid magic for xattr (%s) "
719 "associated with %k", name,
720 INODE_PKEY(inode));
721 err = -EIO;
722 goto out_unlock;
723 }
724 hash = le32_to_cpu(rxh->h_hash);
725 }
726 memcpy(buffer + buffer_pos, data + skip, chunk);
727 unlock_page(page);
728 reiserfs_put_page(page);
729 file_pos += chunk;
730 buffer_pos += chunk;
731 skip = 0;
732 }
733 err = isize - sizeof(struct reiserfs_xattr_header);
734
735 if (xattr_hash(buffer, isize - sizeof(struct reiserfs_xattr_header)) !=
736 hash) {
737 reiserfs_warning(inode->i_sb, "jdm-20002",
738 "Invalid hash for xattr (%s) associated "
739 "with %k", name, INODE_PKEY(inode));
740 err = -EIO;
741 }
742
743out_unlock:
744 up_read(&REISERFS_I(inode)->i_xattr_sem);
745 dput(dentry);
746
747out:
748 return err;
749}
750
751
752
753
754
755
756
757
758
759
760#define for_each_xattr_handler(handlers, handler) \
761 for ((handler) = *(handlers)++; \
762 (handler) != NULL; \
763 (handler) = *(handlers)++)
764
765
766static inline const struct xattr_handler *
767find_xattr_handler_prefix(const struct xattr_handler **handlers,
768 const char *name)
769{
770 const struct xattr_handler *xah;
771
772 if (!handlers)
773 return NULL;
774
775 for_each_xattr_handler(handlers, xah) {
776 const char *prefix = xattr_prefix(xah);
777 if (strncmp(prefix, name, strlen(prefix)) == 0)
778 break;
779 }
780
781 return xah;
782}
783
784struct listxattr_buf {
785 struct dir_context ctx;
786 size_t size;
787 size_t pos;
788 char *buf;
789 struct dentry *dentry;
790};
791
792static int listxattr_filler(struct dir_context *ctx, const char *name,
793 int namelen, loff_t offset, u64 ino,
794 unsigned int d_type)
795{
796 struct listxattr_buf *b =
797 container_of(ctx, struct listxattr_buf, ctx);
798 size_t size;
799
800 if (name[0] != '.' ||
801 (namelen != 1 && (name[1] != '.' || namelen != 2))) {
802 const struct xattr_handler *handler;
803
804 handler = find_xattr_handler_prefix(b->dentry->d_sb->s_xattr,
805 name);
806 if (!handler ||
807 (handler->list && !handler->list(b->dentry)))
808 return 0;
809 size = namelen + 1;
810 if (b->buf) {
811 if (b->pos + size > b->size) {
812 b->pos = -ERANGE;
813 return -ERANGE;
814 }
815 memcpy(b->buf + b->pos, name, namelen);
816 b->buf[b->pos + namelen] = 0;
817 }
818 b->pos += size;
819 }
820 return 0;
821}
822
823
824
825
826
827
828
829
830ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
831{
832 struct dentry *dir;
833 int err = 0;
834 struct listxattr_buf buf = {
835 .ctx.actor = listxattr_filler,
836 .dentry = dentry,
837 .buf = buffer,
838 .size = buffer ? size : 0,
839 };
840
841 if (d_really_is_negative(dentry))
842 return -EINVAL;
843
844 if (!dentry->d_sb->s_xattr ||
845 get_inode_sd_version(d_inode(dentry)) == STAT_DATA_V1)
846 return -EOPNOTSUPP;
847
848 dir = open_xa_dir(d_inode(dentry), XATTR_REPLACE);
849 if (IS_ERR(dir)) {
850 err = PTR_ERR(dir);
851 if (err == -ENODATA)
852 err = 0;
853 goto out;
854 }
855
856 inode_lock_nested(d_inode(dir), I_MUTEX_XATTR);
857 err = reiserfs_readdir_inode(d_inode(dir), &buf.ctx);
858 inode_unlock(d_inode(dir));
859
860 if (!err)
861 err = buf.pos;
862
863 dput(dir);
864out:
865 return err;
866}
867
868static int create_privroot(struct dentry *dentry)
869{
870 int err;
871 struct inode *inode = d_inode(dentry->d_parent);
872
873 WARN_ON_ONCE(!inode_is_locked(inode));
874
875 err = xattr_mkdir(inode, dentry, 0700);
876 if (err || d_really_is_negative(dentry)) {
877 reiserfs_warning(dentry->d_sb, "jdm-20006",
878 "xattrs/ACLs enabled and couldn't "
879 "find/create .reiserfs_priv. "
880 "Failing mount.");
881 return -EOPNOTSUPP;
882 }
883
884 d_inode(dentry)->i_flags |= S_PRIVATE;
885 reiserfs_info(dentry->d_sb, "Created %s - reserved for xattr "
886 "storage.\n", PRIVROOT_NAME);
887
888 return 0;
889}
890
891#else
892int __init reiserfs_xattr_register_handlers(void) { return 0; }
893void reiserfs_xattr_unregister_handlers(void) {}
894static int create_privroot(struct dentry *dentry) { return 0; }
895#endif
896
897
898static const struct xattr_handler *reiserfs_xattr_handlers[] = {
899#ifdef CONFIG_REISERFS_FS_XATTR
900 &reiserfs_xattr_user_handler,
901 &reiserfs_xattr_trusted_handler,
902#endif
903#ifdef CONFIG_REISERFS_FS_SECURITY
904 &reiserfs_xattr_security_handler,
905#endif
906#ifdef CONFIG_REISERFS_FS_POSIX_ACL
907 &posix_acl_access_xattr_handler,
908 &posix_acl_default_xattr_handler,
909#endif
910 NULL
911};
912
913static int xattr_mount_check(struct super_block *s)
914{
915
916
917
918
919 if (old_format_only(s)) {
920 if (reiserfs_xattrs_optional(s)) {
921
922
923
924
925 reiserfs_warning(s, "jdm-2005",
926 "xattrs/ACLs not supported "
927 "on pre-v3.6 format filesystems. "
928 "Failing mount.");
929 return -EOPNOTSUPP;
930 }
931 }
932
933 return 0;
934}
935
936int reiserfs_permission(struct inode *inode, int mask)
937{
938
939
940
941
942 if (IS_PRIVATE(inode))
943 return 0;
944
945 return generic_permission(inode, mask);
946}
947
948static int xattr_hide_revalidate(struct dentry *dentry, unsigned int flags)
949{
950 return -EPERM;
951}
952
953static const struct dentry_operations xattr_lookup_poison_ops = {
954 .d_revalidate = xattr_hide_revalidate,
955};
956
957int reiserfs_lookup_privroot(struct super_block *s)
958{
959 struct dentry *dentry;
960 int err = 0;
961
962
963 inode_lock(d_inode(s->s_root));
964 dentry = lookup_one_len(PRIVROOT_NAME, s->s_root,
965 strlen(PRIVROOT_NAME));
966 if (!IS_ERR(dentry)) {
967 REISERFS_SB(s)->priv_root = dentry;
968 d_set_d_op(dentry, &xattr_lookup_poison_ops);
969 if (d_really_is_positive(dentry))
970 d_inode(dentry)->i_flags |= S_PRIVATE;
971 } else
972 err = PTR_ERR(dentry);
973 inode_unlock(d_inode(s->s_root));
974
975 return err;
976}
977
978
979
980
981
982
983int reiserfs_xattr_init(struct super_block *s, int mount_flags)
984{
985 int err = 0;
986 struct dentry *privroot = REISERFS_SB(s)->priv_root;
987
988 err = xattr_mount_check(s);
989 if (err)
990 goto error;
991
992 if (d_really_is_negative(privroot) && !(mount_flags & SB_RDONLY)) {
993 inode_lock(d_inode(s->s_root));
994 err = create_privroot(REISERFS_SB(s)->priv_root);
995 inode_unlock(d_inode(s->s_root));
996 }
997
998 if (d_really_is_positive(privroot)) {
999 s->s_xattr = reiserfs_xattr_handlers;
1000 inode_lock(d_inode(privroot));
1001 if (!REISERFS_SB(s)->xattr_root) {
1002 struct dentry *dentry;
1003
1004 dentry = lookup_one_len(XAROOT_NAME, privroot,
1005 strlen(XAROOT_NAME));
1006 if (!IS_ERR(dentry))
1007 REISERFS_SB(s)->xattr_root = dentry;
1008 else
1009 err = PTR_ERR(dentry);
1010 }
1011 inode_unlock(d_inode(privroot));
1012 }
1013
1014error:
1015 if (err) {
1016 clear_bit(REISERFS_XATTRS_USER, &REISERFS_SB(s)->s_mount_opt);
1017 clear_bit(REISERFS_POSIXACL, &REISERFS_SB(s)->s_mount_opt);
1018 }
1019
1020
1021 if (reiserfs_posixacl(s))
1022 s->s_flags |= SB_POSIXACL;
1023 else
1024 s->s_flags &= ~SB_POSIXACL;
1025
1026 return err;
1027}
1028