[PARISC] Fix compile warning in pci.h
[linux-2.6.22.y-op.git] / fs / jfs / xattr.c
blob23aa5066b5a438014d84a2d0491c79e49b25e4dd
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Copyright (C) Christoph Hellwig, 2002
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/fs.h>
21 #include <linux/xattr.h>
22 #include <linux/posix_acl_xattr.h>
23 #include <linux/quotaops.h>
24 #include <linux/security.h>
25 #include "jfs_incore.h"
26 #include "jfs_superblock.h"
27 #include "jfs_dmap.h"
28 #include "jfs_debug.h"
29 #include "jfs_dinode.h"
30 #include "jfs_extent.h"
31 #include "jfs_metapage.h"
32 #include "jfs_xattr.h"
33 #include "jfs_acl.h"
36 * jfs_xattr.c: extended attribute service
38 * Overall design --
40 * Format:
42 * Extended attribute lists (jfs_ea_list) consist of an overall size (32 bit
43 * value) and a variable (0 or more) number of extended attribute
44 * entries. Each extended attribute entry (jfs_ea) is a <name,value> double
45 * where <name> is constructed from a null-terminated ascii string
46 * (1 ... 255 bytes in the name) and <value> is arbitrary 8 bit data
47 * (1 ... 65535 bytes). The in-memory format is
49 * 0 1 2 4 4 + namelen + 1
50 * +-------+--------+--------+----------------+-------------------+
51 * | Flags | Name | Value | Name String \0 | Data . . . . |
52 * | | Length | Length | | |
53 * +-------+--------+--------+----------------+-------------------+
55 * A jfs_ea_list then is structured as
57 * 0 4 4 + EA_SIZE(ea1)
58 * +------------+-------------------+--------------------+-----
59 * | Overall EA | First FEA Element | Second FEA Element | .....
60 * | List Size | | |
61 * +------------+-------------------+--------------------+-----
63 * On-disk:
65 * FEALISTs are stored on disk using blocks allocated by dbAlloc() and
66 * written directly. An EA list may be in-lined in the inode if there is
67 * sufficient room available.
70 struct ea_buffer {
71 int flag; /* Indicates what storage xattr points to */
72 int max_size; /* largest xattr that fits in current buffer */
73 dxd_t new_ea; /* dxd to replace ea when modifying xattr */
74 struct metapage *mp; /* metapage containing ea list */
75 struct jfs_ea_list *xattr; /* buffer containing ea list */
79 * ea_buffer.flag values
81 #define EA_INLINE 0x0001
82 #define EA_EXTENT 0x0002
83 #define EA_NEW 0x0004
84 #define EA_MALLOC 0x0008
86 /* Namespaces */
87 #define XATTR_SYSTEM_PREFIX "system."
88 #define XATTR_SYSTEM_PREFIX_LEN (sizeof (XATTR_SYSTEM_PREFIX) - 1)
90 #define XATTR_USER_PREFIX "user."
91 #define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
93 #define XATTR_OS2_PREFIX "os2."
94 #define XATTR_OS2_PREFIX_LEN (sizeof (XATTR_OS2_PREFIX) - 1)
96 /* XATTR_SECURITY_PREFIX is defined in include/linux/xattr.h */
97 #define XATTR_SECURITY_PREFIX_LEN (sizeof (XATTR_SECURITY_PREFIX) - 1)
99 #define XATTR_TRUSTED_PREFIX "trusted."
100 #define XATTR_TRUSTED_PREFIX_LEN (sizeof (XATTR_TRUSTED_PREFIX) - 1)
103 * These three routines are used to recognize on-disk extended attributes
104 * that are in a recognized namespace. If the attribute is not recognized,
105 * "os2." is prepended to the name
107 static inline int is_os2_xattr(struct jfs_ea *ea)
110 * Check for "system."
112 if ((ea->namelen >= XATTR_SYSTEM_PREFIX_LEN) &&
113 !strncmp(ea->name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN))
114 return FALSE;
116 * Check for "user."
118 if ((ea->namelen >= XATTR_USER_PREFIX_LEN) &&
119 !strncmp(ea->name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
120 return FALSE;
122 * Check for "security."
124 if ((ea->namelen >= XATTR_SECURITY_PREFIX_LEN) &&
125 !strncmp(ea->name, XATTR_SECURITY_PREFIX,
126 XATTR_SECURITY_PREFIX_LEN))
127 return FALSE;
129 * Check for "trusted."
131 if ((ea->namelen >= XATTR_TRUSTED_PREFIX_LEN) &&
132 !strncmp(ea->name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN))
133 return FALSE;
135 * Add any other valid namespace prefixes here
139 * We assume it's OS/2's flat namespace
141 return TRUE;
144 static inline int name_size(struct jfs_ea *ea)
146 if (is_os2_xattr(ea))
147 return ea->namelen + XATTR_OS2_PREFIX_LEN;
148 else
149 return ea->namelen;
152 static inline int copy_name(char *buffer, struct jfs_ea *ea)
154 int len = ea->namelen;
156 if (is_os2_xattr(ea)) {
157 memcpy(buffer, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN);
158 buffer += XATTR_OS2_PREFIX_LEN;
159 len += XATTR_OS2_PREFIX_LEN;
161 memcpy(buffer, ea->name, ea->namelen);
162 buffer[ea->namelen] = 0;
164 return len;
167 /* Forward references */
168 static void ea_release(struct inode *inode, struct ea_buffer *ea_buf);
171 * NAME: ea_write_inline
173 * FUNCTION: Attempt to write an EA inline if area is available
175 * PRE CONDITIONS:
176 * Already verified that the specified EA is small enough to fit inline
178 * PARAMETERS:
179 * ip - Inode pointer
180 * ealist - EA list pointer
181 * size - size of ealist in bytes
182 * ea - dxd_t structure to be filled in with necessary EA information
183 * if we successfully copy the EA inline
185 * NOTES:
186 * Checks if the inode's inline area is available. If so, copies EA inline
187 * and sets <ea> fields appropriately. Otherwise, returns failure, EA will
188 * have to be put into an extent.
190 * RETURNS: 0 for successful copy to inline area; -1 if area not available
192 static int ea_write_inline(struct inode *ip, struct jfs_ea_list *ealist,
193 int size, dxd_t * ea)
195 struct jfs_inode_info *ji = JFS_IP(ip);
198 * Make sure we have an EA -- the NULL EA list is valid, but you
199 * can't copy it!
201 if (ealist && size > sizeof (struct jfs_ea_list)) {
202 assert(size <= sizeof (ji->i_inline_ea));
205 * See if the space is available or if it is already being
206 * used for an inline EA.
208 if (!(ji->mode2 & INLINEEA) && !(ji->ea.flag & DXD_INLINE))
209 return -EPERM;
211 DXDsize(ea, size);
212 DXDlength(ea, 0);
213 DXDaddress(ea, 0);
214 memcpy(ji->i_inline_ea, ealist, size);
215 ea->flag = DXD_INLINE;
216 ji->mode2 &= ~INLINEEA;
217 } else {
218 ea->flag = 0;
219 DXDsize(ea, 0);
220 DXDlength(ea, 0);
221 DXDaddress(ea, 0);
223 /* Free up INLINE area */
224 if (ji->ea.flag & DXD_INLINE)
225 ji->mode2 |= INLINEEA;
228 return 0;
232 * NAME: ea_write
234 * FUNCTION: Write an EA for an inode
236 * PRE CONDITIONS: EA has been verified
238 * PARAMETERS:
239 * ip - Inode pointer
240 * ealist - EA list pointer
241 * size - size of ealist in bytes
242 * ea - dxd_t structure to be filled in appropriately with where the
243 * EA was copied
245 * NOTES: Will write EA inline if able to, otherwise allocates blocks for an
246 * extent and synchronously writes it to those blocks.
248 * RETURNS: 0 for success; Anything else indicates failure
250 static int ea_write(struct inode *ip, struct jfs_ea_list *ealist, int size,
251 dxd_t * ea)
253 struct super_block *sb = ip->i_sb;
254 struct jfs_inode_info *ji = JFS_IP(ip);
255 struct jfs_sb_info *sbi = JFS_SBI(sb);
256 int nblocks;
257 s64 blkno;
258 int rc = 0, i;
259 char *cp;
260 s32 nbytes, nb;
261 s32 bytes_to_write;
262 struct metapage *mp;
265 * Quick check to see if this is an in-linable EA. Short EAs
266 * and empty EAs are all in-linable, provided the space exists.
268 if (!ealist || size <= sizeof (ji->i_inline_ea)) {
269 if (!ea_write_inline(ip, ealist, size, ea))
270 return 0;
273 /* figure out how many blocks we need */
274 nblocks = (size + (sb->s_blocksize - 1)) >> sb->s_blocksize_bits;
276 /* Allocate new blocks to quota. */
277 if (DQUOT_ALLOC_BLOCK(ip, nblocks)) {
278 return -EDQUOT;
281 rc = dbAlloc(ip, INOHINT(ip), nblocks, &blkno);
282 if (rc) {
283 /*Rollback quota allocation. */
284 DQUOT_FREE_BLOCK(ip, nblocks);
285 return rc;
289 * Now have nblocks worth of storage to stuff into the FEALIST.
290 * loop over the FEALIST copying data into the buffer one page at
291 * a time.
293 cp = (char *) ealist;
294 nbytes = size;
295 for (i = 0; i < nblocks; i += sbi->nbperpage) {
297 * Determine how many bytes for this request, and round up to
298 * the nearest aggregate block size
300 nb = min(PSIZE, nbytes);
301 bytes_to_write =
302 ((((nb + sb->s_blocksize - 1)) >> sb->s_blocksize_bits))
303 << sb->s_blocksize_bits;
305 if (!(mp = get_metapage(ip, blkno + i, bytes_to_write, 1))) {
306 rc = -EIO;
307 goto failed;
310 memcpy(mp->data, cp, nb);
313 * We really need a way to propagate errors for
314 * forced writes like this one. --hch
316 * (__write_metapage => release_metapage => flush_metapage)
318 #ifdef _JFS_FIXME
319 if ((rc = flush_metapage(mp))) {
321 * the write failed -- this means that the buffer
322 * is still assigned and the blocks are not being
323 * used. this seems like the best error recovery
324 * we can get ...
326 goto failed;
328 #else
329 flush_metapage(mp);
330 #endif
332 cp += PSIZE;
333 nbytes -= nb;
336 ea->flag = DXD_EXTENT;
337 DXDsize(ea, le32_to_cpu(ealist->size));
338 DXDlength(ea, nblocks);
339 DXDaddress(ea, blkno);
341 /* Free up INLINE area */
342 if (ji->ea.flag & DXD_INLINE)
343 ji->mode2 |= INLINEEA;
345 return 0;
347 failed:
348 /* Rollback quota allocation. */
349 DQUOT_FREE_BLOCK(ip, nblocks);
351 dbFree(ip, blkno, nblocks);
352 return rc;
356 * NAME: ea_read_inline
358 * FUNCTION: Read an inlined EA into user's buffer
360 * PARAMETERS:
361 * ip - Inode pointer
362 * ealist - Pointer to buffer to fill in with EA
364 * RETURNS: 0
366 static int ea_read_inline(struct inode *ip, struct jfs_ea_list *ealist)
368 struct jfs_inode_info *ji = JFS_IP(ip);
369 int ea_size = sizeDXD(&ji->ea);
371 if (ea_size == 0) {
372 ealist->size = 0;
373 return 0;
376 /* Sanity Check */
377 if ((sizeDXD(&ji->ea) > sizeof (ji->i_inline_ea)))
378 return -EIO;
379 if (le32_to_cpu(((struct jfs_ea_list *) &ji->i_inline_ea)->size)
380 != ea_size)
381 return -EIO;
383 memcpy(ealist, ji->i_inline_ea, ea_size);
384 return 0;
388 * NAME: ea_read
390 * FUNCTION: copy EA data into user's buffer
392 * PARAMETERS:
393 * ip - Inode pointer
394 * ealist - Pointer to buffer to fill in with EA
396 * NOTES: If EA is inline calls ea_read_inline() to copy EA.
398 * RETURNS: 0 for success; other indicates failure
400 static int ea_read(struct inode *ip, struct jfs_ea_list *ealist)
402 struct super_block *sb = ip->i_sb;
403 struct jfs_inode_info *ji = JFS_IP(ip);
404 struct jfs_sb_info *sbi = JFS_SBI(sb);
405 int nblocks;
406 s64 blkno;
407 char *cp = (char *) ealist;
408 int i;
409 int nbytes, nb;
410 s32 bytes_to_read;
411 struct metapage *mp;
413 /* quick check for in-line EA */
414 if (ji->ea.flag & DXD_INLINE)
415 return ea_read_inline(ip, ealist);
417 nbytes = sizeDXD(&ji->ea);
418 if (!nbytes) {
419 jfs_error(sb, "ea_read: nbytes is 0");
420 return -EIO;
424 * Figure out how many blocks were allocated when this EA list was
425 * originally written to disk.
427 nblocks = lengthDXD(&ji->ea) << sbi->l2nbperpage;
428 blkno = addressDXD(&ji->ea) << sbi->l2nbperpage;
431 * I have found the disk blocks which were originally used to store
432 * the FEALIST. now i loop over each contiguous block copying the
433 * data into the buffer.
435 for (i = 0; i < nblocks; i += sbi->nbperpage) {
437 * Determine how many bytes for this request, and round up to
438 * the nearest aggregate block size
440 nb = min(PSIZE, nbytes);
441 bytes_to_read =
442 ((((nb + sb->s_blocksize - 1)) >> sb->s_blocksize_bits))
443 << sb->s_blocksize_bits;
445 if (!(mp = read_metapage(ip, blkno + i, bytes_to_read, 1)))
446 return -EIO;
448 memcpy(cp, mp->data, nb);
449 release_metapage(mp);
451 cp += PSIZE;
452 nbytes -= nb;
455 return 0;
459 * NAME: ea_get
461 * FUNCTION: Returns buffer containing existing extended attributes.
462 * The size of the buffer will be the larger of the existing
463 * attributes size, or min_size.
465 * The buffer, which may be inlined in the inode or in the
466 * page cache must be release by calling ea_release or ea_put
468 * PARAMETERS:
469 * inode - Inode pointer
470 * ea_buf - Structure to be populated with ealist and its metadata
471 * min_size- minimum size of buffer to be returned
473 * RETURNS: 0 for success; Other indicates failure
475 static int ea_get(struct inode *inode, struct ea_buffer *ea_buf, int min_size)
477 struct jfs_inode_info *ji = JFS_IP(inode);
478 struct super_block *sb = inode->i_sb;
479 int size;
480 int ea_size = sizeDXD(&ji->ea);
481 int blocks_needed, current_blocks;
482 s64 blkno;
483 int rc;
484 int quota_allocation = 0;
486 /* When fsck.jfs clears a bad ea, it doesn't clear the size */
487 if (ji->ea.flag == 0)
488 ea_size = 0;
490 if (ea_size == 0) {
491 if (min_size == 0) {
492 ea_buf->flag = 0;
493 ea_buf->max_size = 0;
494 ea_buf->xattr = NULL;
495 return 0;
497 if ((min_size <= sizeof (ji->i_inline_ea)) &&
498 (ji->mode2 & INLINEEA)) {
499 ea_buf->flag = EA_INLINE | EA_NEW;
500 ea_buf->max_size = sizeof (ji->i_inline_ea);
501 ea_buf->xattr = (struct jfs_ea_list *) ji->i_inline_ea;
502 DXDlength(&ea_buf->new_ea, 0);
503 DXDaddress(&ea_buf->new_ea, 0);
504 ea_buf->new_ea.flag = DXD_INLINE;
505 DXDsize(&ea_buf->new_ea, min_size);
506 return 0;
508 current_blocks = 0;
509 } else if (ji->ea.flag & DXD_INLINE) {
510 if (min_size <= sizeof (ji->i_inline_ea)) {
511 ea_buf->flag = EA_INLINE;
512 ea_buf->max_size = sizeof (ji->i_inline_ea);
513 ea_buf->xattr = (struct jfs_ea_list *) ji->i_inline_ea;
514 goto size_check;
516 current_blocks = 0;
517 } else {
518 if (!(ji->ea.flag & DXD_EXTENT)) {
519 jfs_error(sb, "ea_get: invalid ea.flag)");
520 return -EIO;
522 current_blocks = (ea_size + sb->s_blocksize - 1) >>
523 sb->s_blocksize_bits;
525 size = max(min_size, ea_size);
527 if (size > PSIZE) {
529 * To keep the rest of the code simple. Allocate a
530 * contiguous buffer to work with
532 ea_buf->xattr = kmalloc(size, GFP_KERNEL);
533 if (ea_buf->xattr == NULL)
534 return -ENOMEM;
536 ea_buf->flag = EA_MALLOC;
537 ea_buf->max_size = (size + sb->s_blocksize - 1) &
538 ~(sb->s_blocksize - 1);
540 if (ea_size == 0)
541 return 0;
543 if ((rc = ea_read(inode, ea_buf->xattr))) {
544 kfree(ea_buf->xattr);
545 ea_buf->xattr = NULL;
546 return rc;
548 goto size_check;
550 blocks_needed = (min_size + sb->s_blocksize - 1) >>
551 sb->s_blocksize_bits;
553 if (blocks_needed > current_blocks) {
554 /* Allocate new blocks to quota. */
555 if (DQUOT_ALLOC_BLOCK(inode, blocks_needed))
556 return -EDQUOT;
558 quota_allocation = blocks_needed;
560 rc = dbAlloc(inode, INOHINT(inode), (s64) blocks_needed,
561 &blkno);
562 if (rc)
563 goto clean_up;
565 DXDlength(&ea_buf->new_ea, blocks_needed);
566 DXDaddress(&ea_buf->new_ea, blkno);
567 ea_buf->new_ea.flag = DXD_EXTENT;
568 DXDsize(&ea_buf->new_ea, min_size);
570 ea_buf->flag = EA_EXTENT | EA_NEW;
572 ea_buf->mp = get_metapage(inode, blkno,
573 blocks_needed << sb->s_blocksize_bits,
575 if (ea_buf->mp == NULL) {
576 dbFree(inode, blkno, (s64) blocks_needed);
577 rc = -EIO;
578 goto clean_up;
580 ea_buf->xattr = ea_buf->mp->data;
581 ea_buf->max_size = (min_size + sb->s_blocksize - 1) &
582 ~(sb->s_blocksize - 1);
583 if (ea_size == 0)
584 return 0;
585 if ((rc = ea_read(inode, ea_buf->xattr))) {
586 discard_metapage(ea_buf->mp);
587 dbFree(inode, blkno, (s64) blocks_needed);
588 goto clean_up;
590 goto size_check;
592 ea_buf->flag = EA_EXTENT;
593 ea_buf->mp = read_metapage(inode, addressDXD(&ji->ea),
594 lengthDXD(&ji->ea) << sb->s_blocksize_bits,
596 if (ea_buf->mp == NULL) {
597 rc = -EIO;
598 goto clean_up;
600 ea_buf->xattr = ea_buf->mp->data;
601 ea_buf->max_size = (ea_size + sb->s_blocksize - 1) &
602 ~(sb->s_blocksize - 1);
604 size_check:
605 if (EALIST_SIZE(ea_buf->xattr) != ea_size) {
606 printk(KERN_ERR "ea_get: invalid extended attribute\n");
607 dump_mem("xattr", ea_buf->xattr, ea_size);
608 ea_release(inode, ea_buf);
609 rc = -EIO;
610 goto clean_up;
613 return ea_size;
615 clean_up:
616 /* Rollback quota allocation */
617 if (quota_allocation)
618 DQUOT_FREE_BLOCK(inode, quota_allocation);
620 return (rc);
623 static void ea_release(struct inode *inode, struct ea_buffer *ea_buf)
625 if (ea_buf->flag & EA_MALLOC)
626 kfree(ea_buf->xattr);
627 else if (ea_buf->flag & EA_EXTENT) {
628 assert(ea_buf->mp);
629 release_metapage(ea_buf->mp);
631 if (ea_buf->flag & EA_NEW)
632 dbFree(inode, addressDXD(&ea_buf->new_ea),
633 lengthDXD(&ea_buf->new_ea));
637 static int ea_put(tid_t tid, struct inode *inode, struct ea_buffer *ea_buf,
638 int new_size)
640 struct jfs_inode_info *ji = JFS_IP(inode);
641 unsigned long old_blocks, new_blocks;
642 int rc = 0;
644 if (new_size == 0) {
645 ea_release(inode, ea_buf);
646 ea_buf = NULL;
647 } else if (ea_buf->flag & EA_INLINE) {
648 assert(new_size <= sizeof (ji->i_inline_ea));
649 ji->mode2 &= ~INLINEEA;
650 ea_buf->new_ea.flag = DXD_INLINE;
651 DXDsize(&ea_buf->new_ea, new_size);
652 DXDaddress(&ea_buf->new_ea, 0);
653 DXDlength(&ea_buf->new_ea, 0);
654 } else if (ea_buf->flag & EA_MALLOC) {
655 rc = ea_write(inode, ea_buf->xattr, new_size, &ea_buf->new_ea);
656 kfree(ea_buf->xattr);
657 } else if (ea_buf->flag & EA_NEW) {
658 /* We have already allocated a new dxd */
659 flush_metapage(ea_buf->mp);
660 } else {
661 /* ->xattr must point to original ea's metapage */
662 rc = ea_write(inode, ea_buf->xattr, new_size, &ea_buf->new_ea);
663 discard_metapage(ea_buf->mp);
665 if (rc)
666 return rc;
668 old_blocks = new_blocks = 0;
670 if (ji->ea.flag & DXD_EXTENT) {
671 invalidate_dxd_metapages(inode, ji->ea);
672 old_blocks = lengthDXD(&ji->ea);
675 if (ea_buf) {
676 txEA(tid, inode, &ji->ea, &ea_buf->new_ea);
677 if (ea_buf->new_ea.flag & DXD_EXTENT) {
678 new_blocks = lengthDXD(&ea_buf->new_ea);
679 if (ji->ea.flag & DXD_INLINE)
680 ji->mode2 |= INLINEEA;
682 ji->ea = ea_buf->new_ea;
683 } else {
684 txEA(tid, inode, &ji->ea, NULL);
685 if (ji->ea.flag & DXD_INLINE)
686 ji->mode2 |= INLINEEA;
687 ji->ea.flag = 0;
688 ji->ea.size = 0;
691 /* If old blocks exist, they must be removed from quota allocation. */
692 if (old_blocks)
693 DQUOT_FREE_BLOCK(inode, old_blocks);
695 inode->i_ctime = CURRENT_TIME;
697 return 0;
701 * can_set_system_xattr
703 * This code is specific to the system.* namespace. It contains policy
704 * which doesn't belong in the main xattr codepath.
706 static int can_set_system_xattr(struct inode *inode, const char *name,
707 const void *value, size_t value_len)
709 #ifdef CONFIG_JFS_POSIX_ACL
710 struct posix_acl *acl;
711 int rc;
713 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
714 return -EPERM;
717 * POSIX_ACL_XATTR_ACCESS is tied to i_mode
719 if (strcmp(name, POSIX_ACL_XATTR_ACCESS) == 0) {
720 acl = posix_acl_from_xattr(value, value_len);
721 if (IS_ERR(acl)) {
722 rc = PTR_ERR(acl);
723 printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
724 rc);
725 return rc;
727 if (acl) {
728 mode_t mode = inode->i_mode;
729 rc = posix_acl_equiv_mode(acl, &mode);
730 posix_acl_release(acl);
731 if (rc < 0) {
732 printk(KERN_ERR
733 "posix_acl_equiv_mode returned %d\n",
734 rc);
735 return rc;
737 inode->i_mode = mode;
738 mark_inode_dirty(inode);
741 * We're changing the ACL. Get rid of the cached one
743 acl =JFS_IP(inode)->i_acl;
744 if (acl != JFS_ACL_NOT_CACHED)
745 posix_acl_release(acl);
746 JFS_IP(inode)->i_acl = JFS_ACL_NOT_CACHED;
748 return 0;
749 } else if (strcmp(name, POSIX_ACL_XATTR_DEFAULT) == 0) {
750 acl = posix_acl_from_xattr(value, value_len);
751 if (IS_ERR(acl)) {
752 rc = PTR_ERR(acl);
753 printk(KERN_ERR "posix_acl_from_xattr returned %d\n",
754 rc);
755 return rc;
757 posix_acl_release(acl);
760 * We're changing the default ACL. Get rid of the cached one
762 acl =JFS_IP(inode)->i_default_acl;
763 if (acl && (acl != JFS_ACL_NOT_CACHED))
764 posix_acl_release(acl);
765 JFS_IP(inode)->i_default_acl = JFS_ACL_NOT_CACHED;
767 return 0;
769 #endif /* CONFIG_JFS_POSIX_ACL */
770 return -EOPNOTSUPP;
773 static int can_set_xattr(struct inode *inode, const char *name,
774 const void *value, size_t value_len)
776 if (IS_RDONLY(inode))
777 return -EROFS;
779 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
780 return -EPERM;
782 if(strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) == 0)
784 * "system.*"
786 return can_set_system_xattr(inode, name, value, value_len);
788 if(strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0)
789 return (capable(CAP_SYS_ADMIN) ? 0 : -EPERM);
791 #ifdef CONFIG_JFS_SECURITY
792 if (strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN)
793 == 0)
794 return 0; /* Leave it to the security module */
795 #endif
797 if((strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) != 0) &&
798 (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) != 0))
799 return -EOPNOTSUPP;
801 if (!S_ISREG(inode->i_mode) &&
802 (!S_ISDIR(inode->i_mode) || inode->i_mode &S_ISVTX))
803 return -EPERM;
805 return permission(inode, MAY_WRITE, NULL);
808 int __jfs_setxattr(tid_t tid, struct inode *inode, const char *name,
809 const void *value, size_t value_len, int flags)
811 struct jfs_ea_list *ealist;
812 struct jfs_ea *ea, *old_ea = NULL, *next_ea = NULL;
813 struct ea_buffer ea_buf;
814 int old_ea_size = 0;
815 int xattr_size;
816 int new_size;
817 int namelen = strlen(name);
818 char *os2name = NULL;
819 int found = 0;
820 int rc;
821 int length;
823 if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
824 os2name = kmalloc(namelen - XATTR_OS2_PREFIX_LEN + 1,
825 GFP_KERNEL);
826 if (!os2name)
827 return -ENOMEM;
828 strcpy(os2name, name + XATTR_OS2_PREFIX_LEN);
829 name = os2name;
830 namelen -= XATTR_OS2_PREFIX_LEN;
833 down_write(&JFS_IP(inode)->xattr_sem);
835 xattr_size = ea_get(inode, &ea_buf, 0);
836 if (xattr_size < 0) {
837 rc = xattr_size;
838 goto out;
841 again:
842 ealist = (struct jfs_ea_list *) ea_buf.xattr;
843 new_size = sizeof (struct jfs_ea_list);
845 if (xattr_size) {
846 for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist);
847 ea = NEXT_EA(ea)) {
848 if ((namelen == ea->namelen) &&
849 (memcmp(name, ea->name, namelen) == 0)) {
850 found = 1;
851 if (flags & XATTR_CREATE) {
852 rc = -EEXIST;
853 goto release;
855 old_ea = ea;
856 old_ea_size = EA_SIZE(ea);
857 next_ea = NEXT_EA(ea);
858 } else
859 new_size += EA_SIZE(ea);
863 if (!found) {
864 if (flags & XATTR_REPLACE) {
865 rc = -ENODATA;
866 goto release;
868 if (value == NULL) {
869 rc = 0;
870 goto release;
873 if (value)
874 new_size += sizeof (struct jfs_ea) + namelen + 1 + value_len;
876 if (new_size > ea_buf.max_size) {
878 * We need to allocate more space for merged ea list.
879 * We should only have loop to again: once.
881 ea_release(inode, &ea_buf);
882 xattr_size = ea_get(inode, &ea_buf, new_size);
883 if (xattr_size < 0) {
884 rc = xattr_size;
885 goto out;
887 goto again;
890 /* Remove old ea of the same name */
891 if (found) {
892 /* number of bytes following target EA */
893 length = (char *) END_EALIST(ealist) - (char *) next_ea;
894 if (length > 0)
895 memmove(old_ea, next_ea, length);
896 xattr_size -= old_ea_size;
899 /* Add new entry to the end */
900 if (value) {
901 if (xattr_size == 0)
902 /* Completely new ea list */
903 xattr_size = sizeof (struct jfs_ea_list);
905 ea = (struct jfs_ea *) ((char *) ealist + xattr_size);
906 ea->flag = 0;
907 ea->namelen = namelen;
908 ea->valuelen = (cpu_to_le16(value_len));
909 memcpy(ea->name, name, namelen);
910 ea->name[namelen] = 0;
911 if (value_len)
912 memcpy(&ea->name[namelen + 1], value, value_len);
913 xattr_size += EA_SIZE(ea);
916 /* DEBUG - If we did this right, these number match */
917 if (xattr_size != new_size) {
918 printk(KERN_ERR
919 "jfs_xsetattr: xattr_size = %d, new_size = %d\n",
920 xattr_size, new_size);
922 rc = -EINVAL;
923 goto release;
927 * If we're left with an empty list, there's no ea
929 if (new_size == sizeof (struct jfs_ea_list))
930 new_size = 0;
932 ealist->size = cpu_to_le32(new_size);
934 rc = ea_put(tid, inode, &ea_buf, new_size);
936 goto out;
937 release:
938 ea_release(inode, &ea_buf);
939 out:
940 up_write(&JFS_IP(inode)->xattr_sem);
942 kfree(os2name);
944 return rc;
947 int jfs_setxattr(struct dentry *dentry, const char *name, const void *value,
948 size_t value_len, int flags)
950 struct inode *inode = dentry->d_inode;
951 struct jfs_inode_info *ji = JFS_IP(inode);
952 int rc;
953 tid_t tid;
955 if ((rc = can_set_xattr(inode, name, value, value_len)))
956 return rc;
958 if (value == NULL) { /* empty EA, do not remove */
959 value = "";
960 value_len = 0;
963 tid = txBegin(inode->i_sb, 0);
964 down(&ji->commit_sem);
965 rc = __jfs_setxattr(tid, dentry->d_inode, name, value, value_len,
966 flags);
967 if (!rc)
968 rc = txCommit(tid, 1, &inode, 0);
969 txEnd(tid);
970 up(&ji->commit_sem);
972 return rc;
975 static int can_get_xattr(struct inode *inode, const char *name)
977 #ifdef CONFIG_JFS_SECURITY
978 if(strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) == 0)
979 return 0;
980 #endif
982 if(strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) == 0)
983 return (capable(CAP_SYS_ADMIN) ? 0 : -EPERM);
985 if(strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) == 0)
986 return 0;
988 return permission(inode, MAY_READ, NULL);
991 ssize_t __jfs_getxattr(struct inode *inode, const char *name, void *data,
992 size_t buf_size)
994 struct jfs_ea_list *ealist;
995 struct jfs_ea *ea;
996 struct ea_buffer ea_buf;
997 int xattr_size;
998 ssize_t size;
999 int namelen = strlen(name);
1000 char *os2name = NULL;
1001 int rc;
1002 char *value;
1004 if ((rc = can_get_xattr(inode, name)))
1005 return rc;
1007 if (strncmp(name, XATTR_OS2_PREFIX, XATTR_OS2_PREFIX_LEN) == 0) {
1008 os2name = kmalloc(namelen - XATTR_OS2_PREFIX_LEN + 1,
1009 GFP_KERNEL);
1010 if (!os2name)
1011 return -ENOMEM;
1012 strcpy(os2name, name + XATTR_OS2_PREFIX_LEN);
1013 name = os2name;
1014 namelen -= XATTR_OS2_PREFIX_LEN;
1017 down_read(&JFS_IP(inode)->xattr_sem);
1019 xattr_size = ea_get(inode, &ea_buf, 0);
1021 if (xattr_size < 0) {
1022 size = xattr_size;
1023 goto out;
1026 if (xattr_size == 0)
1027 goto not_found;
1029 ealist = (struct jfs_ea_list *) ea_buf.xattr;
1031 /* Find the named attribute */
1032 for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea))
1033 if ((namelen == ea->namelen) &&
1034 memcmp(name, ea->name, namelen) == 0) {
1035 /* Found it */
1036 size = le16_to_cpu(ea->valuelen);
1037 if (!data)
1038 goto release;
1039 else if (size > buf_size) {
1040 size = -ERANGE;
1041 goto release;
1043 value = ((char *) &ea->name) + ea->namelen + 1;
1044 memcpy(data, value, size);
1045 goto release;
1047 not_found:
1048 size = -ENODATA;
1049 release:
1050 ea_release(inode, &ea_buf);
1051 out:
1052 up_read(&JFS_IP(inode)->xattr_sem);
1054 kfree(os2name);
1056 return size;
1059 ssize_t jfs_getxattr(struct dentry *dentry, const char *name, void *data,
1060 size_t buf_size)
1062 int err;
1064 err = __jfs_getxattr(dentry->d_inode, name, data, buf_size);
1066 return err;
1070 * No special permissions are needed to list attributes except for trusted.*
1072 static inline int can_list(struct jfs_ea *ea)
1074 return (strncmp(ea->name, XATTR_TRUSTED_PREFIX,
1075 XATTR_TRUSTED_PREFIX_LEN) ||
1076 capable(CAP_SYS_ADMIN));
1079 ssize_t jfs_listxattr(struct dentry * dentry, char *data, size_t buf_size)
1081 struct inode *inode = dentry->d_inode;
1082 char *buffer;
1083 ssize_t size = 0;
1084 int xattr_size;
1085 struct jfs_ea_list *ealist;
1086 struct jfs_ea *ea;
1087 struct ea_buffer ea_buf;
1089 down_read(&JFS_IP(inode)->xattr_sem);
1091 xattr_size = ea_get(inode, &ea_buf, 0);
1092 if (xattr_size < 0) {
1093 size = xattr_size;
1094 goto out;
1097 if (xattr_size == 0)
1098 goto release;
1100 ealist = (struct jfs_ea_list *) ea_buf.xattr;
1102 /* compute required size of list */
1103 for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) {
1104 if (can_list(ea))
1105 size += name_size(ea) + 1;
1108 if (!data)
1109 goto release;
1111 if (size > buf_size) {
1112 size = -ERANGE;
1113 goto release;
1116 /* Copy attribute names to buffer */
1117 buffer = data;
1118 for (ea = FIRST_EA(ealist); ea < END_EALIST(ealist); ea = NEXT_EA(ea)) {
1119 if (can_list(ea)) {
1120 int namelen = copy_name(buffer, ea);
1121 buffer += namelen + 1;
1125 release:
1126 ea_release(inode, &ea_buf);
1127 out:
1128 up_read(&JFS_IP(inode)->xattr_sem);
1129 return size;
1132 int jfs_removexattr(struct dentry *dentry, const char *name)
1134 struct inode *inode = dentry->d_inode;
1135 struct jfs_inode_info *ji = JFS_IP(inode);
1136 int rc;
1137 tid_t tid;
1139 if ((rc = can_set_xattr(inode, name, NULL, 0)))
1140 return rc;
1142 tid = txBegin(inode->i_sb, 0);
1143 down(&ji->commit_sem);
1144 rc = __jfs_setxattr(tid, dentry->d_inode, name, NULL, 0, XATTR_REPLACE);
1145 if (!rc)
1146 rc = txCommit(tid, 1, &inode, 0);
1147 txEnd(tid);
1148 up(&ji->commit_sem);
1150 return rc;
1153 #ifdef CONFIG_JFS_SECURITY
1154 int jfs_init_security(tid_t tid, struct inode *inode, struct inode *dir)
1156 int rc;
1157 size_t len;
1158 void *value;
1159 char *suffix;
1160 char *name;
1162 rc = security_inode_init_security(inode, dir, &suffix, &value, &len);
1163 if (rc) {
1164 if (rc == -EOPNOTSUPP)
1165 return 0;
1166 return rc;
1168 name = kmalloc(XATTR_SECURITY_PREFIX_LEN + 1 + strlen(suffix),
1169 GFP_NOFS);
1170 if (!name) {
1171 rc = -ENOMEM;
1172 goto kmalloc_failed;
1174 strcpy(name, XATTR_SECURITY_PREFIX);
1175 strcpy(name + XATTR_SECURITY_PREFIX_LEN, suffix);
1177 rc = __jfs_setxattr(tid, inode, name, value, len, 0);
1179 kfree(name);
1180 kmalloc_failed:
1181 kfree(suffix);
1182 kfree(value);
1184 return rc;
1186 #endif