2 * ext_attr.c --- extended attribute blocks
4 * Copyright (C) 2001 Andreas Gruenbacher, <a.gruenbacher@computer.org>
6 * Copyright (C) 2002 Theodore Ts'o.
9 * This file may be redistributed under the terms of the GNU Library
10 * General Public License, version 2.
23 #include "ext2_ext_attr.h"
27 #define NAME_HASH_SHIFT 5
28 #define VALUE_HASH_SHIFT 16
31 * ext2_xattr_hash_entry()
33 * Compute the hash of an extended attribute.
35 __u32 ext2fs_ext_attr_hash_entry(struct ext2_ext_attr_entry *entry, void *data)
38 char *name = ((char *) entry) + sizeof(struct ext2_ext_attr_entry);
41 for (n = 0; n < entry->e_name_len; n++) {
42 hash = (hash << NAME_HASH_SHIFT) ^
43 (hash >> (8*sizeof(hash) - NAME_HASH_SHIFT)) ^
47 /* The hash needs to be calculated on the data in little-endian. */
48 if (entry->e_value_block == 0 && entry->e_value_size != 0) {
49 __u32 *value = (__u32 *)data;
50 for (n = (entry->e_value_size + EXT2_EXT_ATTR_ROUND) >>
51 EXT2_EXT_ATTR_PAD_BITS; n; n--) {
52 hash = (hash << VALUE_HASH_SHIFT) ^
53 (hash >> (8*sizeof(hash) - VALUE_HASH_SHIFT)) ^
54 ext2fs_le32_to_cpu(*value++);
61 static errcode_t check_ext_attr_header(struct ext2_ext_attr_header *header)
63 if ((header->h_magic != EXT2_EXT_ATTR_MAGIC_v1 &&
64 header->h_magic != EXT2_EXT_ATTR_MAGIC) ||
65 header->h_blocks != 1)
66 return EXT2_ET_BAD_EA_HEADER;
71 #undef NAME_HASH_SHIFT
72 #undef VALUE_HASH_SHIFT
74 errcode_t ext2fs_read_ext_attr3(ext2_filsys fs, blk64_t block, void *buf,
80 retval = io_channel_read_blk64(fs->io, block, 1, buf);
84 if (!(fs->flags & EXT2_FLAG_IGNORE_CSUM_ERRORS) &&
85 !ext2fs_ext_attr_block_csum_verify(fs, inum, block, buf))
88 #ifdef WORDS_BIGENDIAN
89 ext2fs_swap_ext_attr(buf, buf, fs->blocksize, 1);
92 retval = check_ext_attr_header(buf);
93 if (retval == 0 && csum_failed)
94 retval = EXT2_ET_EXT_ATTR_CSUM_INVALID;
99 errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block, void *buf)
101 return ext2fs_read_ext_attr3(fs, block, buf, 0);
104 errcode_t ext2fs_read_ext_attr(ext2_filsys fs, blk_t block, void *buf)
106 return ext2fs_read_ext_attr2(fs, block, buf);
109 errcode_t ext2fs_write_ext_attr3(ext2_filsys fs, blk64_t block, void *inbuf,
115 #ifdef WORDS_BIGENDIAN
116 retval = ext2fs_get_mem(fs->blocksize, &write_buf);
119 ext2fs_swap_ext_attr(write_buf, inbuf, fs->blocksize, 1);
121 write_buf = (char *) inbuf;
124 retval = ext2fs_ext_attr_block_csum_set(fs, inum, block,
125 (struct ext2_ext_attr_header *)write_buf);
129 retval = io_channel_write_blk64(fs->io, block, 1, write_buf);
130 #ifdef WORDS_BIGENDIAN
131 ext2fs_free_mem(&write_buf);
134 ext2fs_mark_changed(fs);
138 errcode_t ext2fs_write_ext_attr2(ext2_filsys fs, blk64_t block, void *inbuf)
140 return ext2fs_write_ext_attr3(fs, block, inbuf, 0);
143 errcode_t ext2fs_write_ext_attr(ext2_filsys fs, blk_t block, void *inbuf)
145 return ext2fs_write_ext_attr2(fs, block, inbuf);
149 * This function adjusts the reference count of the EA block.
151 errcode_t ext2fs_adjust_ea_refcount3(ext2_filsys fs, blk64_t blk,
152 char *block_buf, int adjust,
153 __u32 *newcount, ext2_ino_t inum)
156 struct ext2_ext_attr_header *header;
159 if ((blk >= ext2fs_blocks_count(fs->super)) ||
160 (blk < fs->super->s_first_data_block))
161 return EXT2_ET_BAD_EA_BLOCK_NUM;
164 retval = ext2fs_get_mem(fs->blocksize, &buf);
170 retval = ext2fs_read_ext_attr3(fs, blk, block_buf, inum);
174 header = (struct ext2_ext_attr_header *) block_buf;
175 header->h_refcount += adjust;
177 *newcount = header->h_refcount;
179 retval = ext2fs_write_ext_attr3(fs, blk, block_buf, inum);
185 ext2fs_free_mem(&buf);
189 errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk,
190 char *block_buf, int adjust,
193 return ext2fs_adjust_ea_refcount3(fs, blk, block_buf, adjust,
197 errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk,
198 char *block_buf, int adjust,
201 return ext2fs_adjust_ea_refcount2(fs, blk, block_buf, adjust,
205 /* Manipulate the contents of extended attribute regions */
212 struct ext2_xattr_handle {
215 struct ext2_xattr *attrs;
216 size_t length, count;
221 static errcode_t ext2fs_xattrs_expand(struct ext2_xattr_handle *h,
222 unsigned int expandby)
224 struct ext2_xattr *new_attrs;
227 err = ext2fs_get_arrayzero(h->length + expandby,
228 sizeof(struct ext2_xattr), &new_attrs);
232 memcpy(new_attrs, h->attrs, h->length * sizeof(struct ext2_xattr));
233 ext2fs_free_mem(&h->attrs);
234 h->length += expandby;
235 h->attrs = new_attrs;
240 struct ea_name_index {
245 /* Keep these names sorted in order of decreasing specificity. */
246 static struct ea_name_index ea_names[] = {
247 {3, "system.posix_acl_default"},
248 {2, "system.posix_acl_access"},
249 {8, "system.richacl"},
257 static int find_ea_index(char *fullname, char **name, int *index);
259 /* Push empty attributes to the end and inlinedata to the front. */
260 static int attr_compare(const void *a, const void *b)
262 const struct ext2_xattr *xa = a, *xb = b;
263 char *xa_suffix, *xb_suffix;
267 if (xa->name == NULL)
269 else if (xb->name == NULL)
271 else if (!strcmp(xa->name, "system.data"))
273 else if (!strcmp(xb->name, "system.data"))
277 * Duplicate the kernel's sorting algorithm because xattr blocks
278 * require sorted keys.
280 xa_suffix = xa->name;
281 xb_suffix = xb->name;
283 find_ea_index(xa->name, &xa_suffix, &xa_idx);
284 find_ea_index(xb->name, &xb_suffix, &xb_idx);
285 cmp = xa_idx - xb_idx;
288 cmp = strlen(xa_suffix) - strlen(xb_suffix);
291 cmp = strcmp(xa_suffix, xb_suffix);
295 static const char *find_ea_prefix(int index)
297 struct ea_name_index *e;
299 for (e = ea_names; e->name; e++)
300 if (e->index == index)
306 static int find_ea_index(char *fullname, char **name, int *index)
308 struct ea_name_index *e;
310 for (e = ea_names; e->name; e++) {
311 if (memcmp(fullname, e->name, strlen(e->name)) == 0) {
312 *name = (char *)fullname + strlen(e->name);
320 errcode_t ext2fs_free_ext_attr(ext2_filsys fs, ext2_ino_t ino,
321 struct ext2_inode_large *inode)
323 struct ext2_ext_attr_header *header;
324 void *block_buf = NULL;
327 struct ext2_inode_large i;
331 err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)&i,
332 sizeof(struct ext2_inode_large));
338 /* Do we already have an EA block? */
339 blk = ext2fs_file_acl_block(fs, (struct ext2_inode *)inode);
343 /* Find block, zero it, write back */
344 if ((blk < fs->super->s_first_data_block) ||
345 (blk >= ext2fs_blocks_count(fs->super))) {
346 err = EXT2_ET_BAD_EA_BLOCK_NUM;
350 err = ext2fs_get_mem(fs->blocksize, &block_buf);
354 err = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
358 /* We only know how to deal with v2 EA blocks */
359 header = (struct ext2_ext_attr_header *) block_buf;
360 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
361 err = EXT2_ET_BAD_EA_HEADER;
365 header->h_refcount--;
366 err = ext2fs_write_ext_attr3(fs, blk, block_buf, ino);
370 /* Erase link to block */
371 ext2fs_file_acl_block_set(fs, (struct ext2_inode *)inode, 0);
372 if (header->h_refcount == 0)
373 ext2fs_block_alloc_stats2(fs, blk, -1);
374 err = ext2fs_iblk_sub_blocks(fs, (struct ext2_inode *)inode, 1);
380 err = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)&i,
381 sizeof(struct ext2_inode_large));
387 ext2fs_free_mem(&block_buf);
392 static errcode_t prep_ea_block_for_write(ext2_filsys fs, ext2_ino_t ino,
393 struct ext2_inode_large *inode)
395 struct ext2_ext_attr_header *header;
396 void *block_buf = NULL;
400 /* Do we already have an EA block? */
401 blk = ext2fs_file_acl_block(fs, (struct ext2_inode *)inode);
403 if ((blk < fs->super->s_first_data_block) ||
404 (blk >= ext2fs_blocks_count(fs->super))) {
405 err = EXT2_ET_BAD_EA_BLOCK_NUM;
409 err = ext2fs_get_mem(fs->blocksize, &block_buf);
413 err = ext2fs_read_ext_attr3(fs, blk, block_buf, ino);
417 /* We only know how to deal with v2 EA blocks */
418 header = (struct ext2_ext_attr_header *) block_buf;
419 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
420 err = EXT2_ET_BAD_EA_HEADER;
424 /* Single-user block. We're done here. */
425 if (header->h_refcount == 1)
428 /* We need to CoW the block. */
429 header->h_refcount--;
430 err = ext2fs_write_ext_attr3(fs, blk, block_buf, ino);
434 /* No block, we must increment i_blocks */
435 err = ext2fs_iblk_add_blocks(fs, (struct ext2_inode *)inode,
441 /* Allocate a block */
442 goal = ext2fs_find_inode_goal(fs, ino, (struct ext2_inode *)inode, 0);
443 err = ext2fs_alloc_block2(fs, goal, NULL, &blk);
446 ext2fs_file_acl_block_set(fs, (struct ext2_inode *)inode, blk);
449 ext2fs_free_mem(&block_buf);
455 static errcode_t write_xattrs_to_buffer(struct ext2_xattr_handle *handle,
456 struct ext2_xattr **pos,
458 unsigned int storage_size,
459 unsigned int value_offset_correction,
462 struct ext2_xattr *x = *pos;
463 struct ext2_ext_attr_entry *e = entries_start;
464 char *end = (char *) entries_start + storage_size;
466 unsigned int entry_size, value_size;
469 memset(entries_start, 0, storage_size);
470 /* For all remaining x... */
471 for (; x < handle->attrs + handle->length; x++) {
475 /* Calculate index and shortname position */
477 ret = find_ea_index(x->name, &shortname, &idx);
479 /* Calculate entry and value size */
480 entry_size = (sizeof(*e) + strlen(shortname) +
481 EXT2_EXT_ATTR_PAD - 1) &
482 ~(EXT2_EXT_ATTR_PAD - 1);
483 value_size = ((x->value_len + EXT2_EXT_ATTR_PAD - 1) /
484 EXT2_EXT_ATTR_PAD) * EXT2_EXT_ATTR_PAD;
487 * Would entry collide with value?
488 * Note that we must leave sufficient room for a (u32)0 to
489 * mark the end of the entries.
491 if ((char *)e + entry_size + sizeof(__u32) > end - value_size)
494 /* Fill out e appropriately */
495 e->e_name_len = strlen(shortname);
496 e->e_name_index = (ret ? idx : 0);
497 e->e_value_offs = end - value_size - (char *)entries_start +
498 value_offset_correction;
499 e->e_value_block = 0;
500 e->e_value_size = x->value_len;
502 /* Store name and value */
504 memcpy((char *)e + sizeof(*e), shortname, e->e_name_len);
505 memcpy(end, x->value, e->e_value_size);
508 e->e_hash = ext2fs_ext_attr_hash_entry(e, end);
512 e = EXT2_EXT_ATTR_NEXT(e);
520 errcode_t ext2fs_xattrs_write(struct ext2_xattr_handle *handle)
522 struct ext2_xattr *x;
523 struct ext2_inode_large *inode;
524 char *start, *block_buf = NULL;
525 struct ext2_ext_attr_header *header;
526 __u32 ea_inode_magic;
528 unsigned int storage_size;
532 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
533 i = EXT2_INODE_SIZE(handle->fs->super);
534 if (i < sizeof(*inode))
536 err = ext2fs_get_memzero(i, &inode);
540 err = ext2fs_read_inode_full(handle->fs, handle->ino,
541 (struct ext2_inode *)inode,
542 EXT2_INODE_SIZE(handle->fs->super));
546 /* If extra_isize isn't set, we need to set it now */
547 if (inode->i_extra_isize == 0 &&
548 EXT2_INODE_SIZE(handle->fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
549 char *p = (char *)inode;
550 size_t extra = handle->fs->super->s_want_extra_isize;
553 extra = sizeof(__u32);
554 memset(p + EXT2_GOOD_OLD_INODE_SIZE, 0, extra);
555 inode->i_extra_isize = extra;
557 if (inode->i_extra_isize & 3) {
558 err = EXT2_ET_INODE_CORRUPTED;
563 * Force the inlinedata attr to the front and the empty entries
567 qsort(x, handle->length, sizeof(struct ext2_xattr), attr_compare);
569 /* Does the inode have space for EA? */
570 if (inode->i_extra_isize < sizeof(inode->i_extra_isize) ||
571 EXT2_INODE_SIZE(handle->fs->super) <= EXT2_GOOD_OLD_INODE_SIZE +
572 inode->i_extra_isize +
576 /* Write the inode EA */
577 ea_inode_magic = EXT2_EXT_ATTR_MAGIC;
578 memcpy(((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
579 inode->i_extra_isize, &ea_inode_magic, sizeof(__u32));
580 storage_size = EXT2_INODE_SIZE(handle->fs->super) -
581 EXT2_GOOD_OLD_INODE_SIZE - inode->i_extra_isize -
583 start = ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
584 inode->i_extra_isize + sizeof(__u32);
586 err = write_xattrs_to_buffer(handle, &x, start, storage_size, 0, 0);
592 if (x >= handle->attrs + handle->count)
595 /* Write the EA block */
596 err = ext2fs_get_memzero(handle->fs->blocksize, &block_buf);
600 storage_size = handle->fs->blocksize -
601 sizeof(struct ext2_ext_attr_header);
602 start = block_buf + sizeof(struct ext2_ext_attr_header);
604 err = write_xattrs_to_buffer(handle, &x, start, storage_size,
605 start - block_buf, 1);
609 if (x < handle->attrs + handle->length) {
610 err = EXT2_ET_EA_NO_SPACE;
614 /* Write a header on the EA block */
615 header = (struct ext2_ext_attr_header *) block_buf;
616 header->h_magic = EXT2_EXT_ATTR_MAGIC;
617 header->h_refcount = 1;
618 header->h_blocks = 1;
620 /* Get a new block for writing */
621 err = prep_ea_block_for_write(handle->fs, handle->ino, inode);
625 /* Finally, write the new EA block */
626 blk = ext2fs_file_acl_block(handle->fs,
627 (struct ext2_inode *)inode);
628 err = ext2fs_write_ext_attr3(handle->fs, blk, block_buf,
634 blk = ext2fs_file_acl_block(handle->fs, (struct ext2_inode *)inode);
635 if (!block_buf && blk) {
636 /* xattrs shrunk, free the block */
637 err = ext2fs_free_ext_attr(handle->fs, handle->ino, inode);
642 /* Write the inode */
643 err = ext2fs_write_inode_full(handle->fs, handle->ino,
644 (struct ext2_inode *)inode,
645 EXT2_INODE_SIZE(handle->fs->super));
650 ext2fs_free_mem(&block_buf);
652 ext2fs_free_mem(&inode);
657 static errcode_t read_xattrs_from_buffer(struct ext2_xattr_handle *handle,
658 struct ext2_ext_attr_entry *entries,
659 unsigned int storage_size,
663 struct ext2_xattr *x;
664 struct ext2_ext_attr_entry *entry, *end;
666 unsigned int remain, prefix_len;
668 unsigned int values_size = storage_size +
669 ((char *)entries - value_start);
677 remain = storage_size;
678 while (remain >= sizeof(struct ext2_ext_attr_entry) &&
679 !EXT2_EXT_IS_LAST_ENTRY(end)) {
681 /* header eats this space */
682 remain -= sizeof(struct ext2_ext_attr_entry);
684 /* is attribute name valid? */
685 if (EXT2_EXT_ATTR_SIZE(end->e_name_len) > remain)
686 return EXT2_ET_EA_BAD_NAME_LEN;
688 /* attribute len eats this space */
689 remain -= EXT2_EXT_ATTR_SIZE(end->e_name_len);
690 end = EXT2_EXT_ATTR_NEXT(end);
694 remain = storage_size;
695 while (remain >= sizeof(struct ext2_ext_attr_entry) &&
696 !EXT2_EXT_IS_LAST_ENTRY(entry)) {
699 /* header eats this space */
700 remain -= sizeof(struct ext2_ext_attr_entry);
702 /* attribute len eats this space */
703 remain -= EXT2_EXT_ATTR_SIZE(entry->e_name_len);
705 /* check value size */
706 if (entry->e_value_size > remain)
707 return EXT2_ET_EA_BAD_VALUE_SIZE;
709 if (entry->e_value_offs + entry->e_value_size > values_size)
710 return EXT2_ET_EA_BAD_VALUE_OFFSET;
712 if (entry->e_value_size > 0 &&
713 value_start + entry->e_value_offs <
714 (char *)end + sizeof(__u32))
715 return EXT2_ET_EA_BAD_VALUE_OFFSET;
717 /* e_value_block must be 0 in inode's ea */
718 if (entry->e_value_block != 0)
719 return EXT2_ET_BAD_EA_BLOCK_NUM;
721 hash = ext2fs_ext_attr_hash_entry(entry, value_start +
722 entry->e_value_offs);
724 /* e_hash may be 0 in older inode's ea */
725 if (entry->e_hash != 0 && entry->e_hash != hash)
726 return EXT2_ET_BAD_EA_HASH;
728 remain -= entry->e_value_size;
730 /* Allocate space for more attrs? */
731 if (x == handle->attrs + handle->length) {
732 err = ext2fs_xattrs_expand(handle, 4);
735 x = handle->attrs + handle->length - 4;
738 /* Extract name/value */
739 prefix = find_ea_prefix(entry->e_name_index);
740 prefix_len = (prefix ? strlen(prefix) : 0);
741 err = ext2fs_get_memzero(entry->e_name_len + prefix_len + 1,
746 memcpy(x->name, prefix, prefix_len);
747 if (entry->e_name_len)
748 memcpy(x->name + prefix_len,
749 (char *)entry + sizeof(*entry),
752 err = ext2fs_get_mem(entry->e_value_size, &x->value);
755 x->value_len = entry->e_value_size;
756 memcpy(x->value, value_start + entry->e_value_offs,
757 entry->e_value_size);
760 entry = EXT2_EXT_ATTR_NEXT(entry);
766 static void xattrs_free_keys(struct ext2_xattr_handle *h)
768 struct ext2_xattr *a = h->attrs;
771 for (i = 0; i < h->length; i++) {
773 ext2fs_free_mem(&a[i].name);
775 ext2fs_free_mem(&a[i].value);
780 errcode_t ext2fs_xattrs_read(struct ext2_xattr_handle *handle)
782 struct ext2_inode_large *inode;
783 struct ext2_ext_attr_header *header;
784 __u32 ea_inode_magic;
785 unsigned int storage_size;
786 char *start, *block_buf = NULL;
791 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
792 i = EXT2_INODE_SIZE(handle->fs->super);
793 if (i < sizeof(*inode))
795 err = ext2fs_get_memzero(i, &inode);
799 err = ext2fs_read_inode_full(handle->fs, handle->ino,
800 (struct ext2_inode *)inode,
801 EXT2_INODE_SIZE(handle->fs->super));
805 xattrs_free_keys(handle);
807 /* Does the inode have space for EA? */
808 if (inode->i_extra_isize < sizeof(inode->i_extra_isize) ||
809 EXT2_INODE_SIZE(handle->fs->super) <= EXT2_GOOD_OLD_INODE_SIZE +
810 inode->i_extra_isize +
813 if (inode->i_extra_isize & 3) {
814 err = EXT2_ET_INODE_CORRUPTED;
818 /* Look for EA in the inode */
819 memcpy(&ea_inode_magic, ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
820 inode->i_extra_isize, sizeof(__u32));
821 if (ea_inode_magic == EXT2_EXT_ATTR_MAGIC) {
822 storage_size = EXT2_INODE_SIZE(handle->fs->super) -
823 EXT2_GOOD_OLD_INODE_SIZE - inode->i_extra_isize -
825 start = ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
826 inode->i_extra_isize + sizeof(__u32);
828 err = read_xattrs_from_buffer(handle,
829 (struct ext2_ext_attr_entry *) start, storage_size,
830 start, &handle->count);
836 /* Look for EA in a separate EA block */
837 blk = ext2fs_file_acl_block(handle->fs, (struct ext2_inode *)inode);
839 if ((blk < handle->fs->super->s_first_data_block) ||
840 (blk >= ext2fs_blocks_count(handle->fs->super))) {
841 err = EXT2_ET_BAD_EA_BLOCK_NUM;
845 err = ext2fs_get_mem(handle->fs->blocksize, &block_buf);
849 err = ext2fs_read_ext_attr3(handle->fs, blk, block_buf,
854 /* We only know how to deal with v2 EA blocks */
855 header = (struct ext2_ext_attr_header *) block_buf;
856 if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
857 err = EXT2_ET_BAD_EA_HEADER;
862 storage_size = handle->fs->blocksize -
863 sizeof(struct ext2_ext_attr_header);
864 start = block_buf + sizeof(struct ext2_ext_attr_header);
865 err = read_xattrs_from_buffer(handle,
866 (struct ext2_ext_attr_entry *) start, storage_size,
867 block_buf, &handle->count);
871 ext2fs_free_mem(&block_buf);
874 ext2fs_free_mem(&block_buf);
875 ext2fs_free_mem(&inode);
879 ext2fs_free_mem(&block_buf);
881 ext2fs_free_mem(&inode);
885 errcode_t ext2fs_xattrs_iterate(struct ext2_xattr_handle *h,
886 int (*func)(char *name, char *value,
887 size_t value_len, void *data),
890 struct ext2_xattr *x;
893 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
894 for (x = h->attrs; x < h->attrs + h->length; x++) {
898 ret = func(x->name, x->value, x->value_len, data);
899 if (ret & XATTR_CHANGED)
901 if (ret & XATTR_ABORT)
908 errcode_t ext2fs_xattr_get(struct ext2_xattr_handle *h, const char *key,
909 void **value, size_t *value_len)
911 struct ext2_xattr *x;
915 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
916 for (x = h->attrs; x < h->attrs + h->length; x++) {
920 if (strcmp(x->name, key) == 0) {
921 err = ext2fs_get_mem(x->value_len, &val);
924 memcpy(val, x->value, x->value_len);
926 *value_len = x->value_len;
931 return EXT2_ET_EA_KEY_NOT_FOUND;
934 errcode_t ext2fs_xattr_inode_max_size(ext2_filsys fs, ext2_ino_t ino,
937 struct ext2_ext_attr_entry *entry;
938 struct ext2_inode_large *inode;
939 __u32 ea_inode_magic;
945 i = EXT2_INODE_SIZE(fs->super);
946 if (i < sizeof(*inode))
948 err = ext2fs_get_memzero(i, &inode);
952 err = ext2fs_read_inode_full(fs, ino, (struct ext2_inode *)inode,
953 EXT2_INODE_SIZE(fs->super));
957 /* Does the inode have size for EA? */
958 if (EXT2_INODE_SIZE(fs->super) <= EXT2_GOOD_OLD_INODE_SIZE +
959 inode->i_extra_isize +
961 err = EXT2_ET_INLINE_DATA_NO_SPACE;
965 minoff = EXT2_INODE_SIZE(fs->super) - sizeof(*inode) - sizeof(__u32);
966 memcpy(&ea_inode_magic, ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
967 inode->i_extra_isize, sizeof(__u32));
968 if (ea_inode_magic == EXT2_EXT_ATTR_MAGIC) {
969 /* has xattrs. calculate the size */
970 start= ((char *) inode) + EXT2_GOOD_OLD_INODE_SIZE +
971 inode->i_extra_isize + sizeof(__u32);
972 entry = (struct ext2_ext_attr_entry *) start;
973 while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
974 if (!entry->e_value_block && entry->e_value_size) {
975 unsigned int offs = entry->e_value_offs;
979 entry = EXT2_EXT_ATTR_NEXT(entry);
981 *size = minoff - ((char *)entry - (char *)start) - sizeof(__u32);
983 /* no xattr. return a maximum size */
984 *size = EXT2_EXT_ATTR_SIZE(minoff -
985 EXT2_EXT_ATTR_LEN(strlen("data")) -
986 EXT2_EXT_ATTR_ROUND - sizeof(__u32));
990 ext2fs_free_mem(&inode);
994 errcode_t ext2fs_xattr_set(struct ext2_xattr_handle *handle,
999 struct ext2_xattr *x, *last_empty;
1003 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1005 for (x = handle->attrs; x < handle->attrs + handle->length; x++) {
1012 if (strcmp(x->name, key) == 0) {
1013 err = ext2fs_get_mem(value_len, &new_value);
1016 memcpy(new_value, value, value_len);
1017 ext2fs_free_mem(&x->value);
1018 x->value = new_value;
1019 x->value_len = value_len;
1025 /* Add attr to empty slot */
1027 err = ext2fs_get_mem(strlen(key) + 1, &last_empty->name);
1030 strcpy(last_empty->name, key);
1032 err = ext2fs_get_mem(value_len, &last_empty->value);
1035 memcpy(last_empty->value, value, value_len);
1036 last_empty->value_len = value_len;
1042 /* Expand array, append slot */
1043 err = ext2fs_xattrs_expand(handle, 4);
1047 x = handle->attrs + handle->length - 4;
1048 err = ext2fs_get_mem(strlen(key) + 1, &x->name);
1051 strcpy(x->name, key);
1053 err = ext2fs_get_mem(value_len, &x->value);
1056 memcpy(x->value, value, value_len);
1057 x->value_len = value_len;
1063 errcode_t ext2fs_xattr_remove(struct ext2_xattr_handle *handle,
1066 struct ext2_xattr *x;
1068 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1069 for (x = handle->attrs; x < handle->attrs + handle->length; x++) {
1073 if (strcmp(x->name, key) == 0) {
1074 ext2fs_free_mem(&x->name);
1075 ext2fs_free_mem(&x->value);
1083 /* no key found, success! */
1087 errcode_t ext2fs_xattrs_open(ext2_filsys fs, ext2_ino_t ino,
1088 struct ext2_xattr_handle **handle)
1090 struct ext2_xattr_handle *h;
1093 if (!ext2fs_has_feature_xattr(fs->super) &&
1094 !ext2fs_has_feature_inline_data(fs->super))
1095 return EXT2_ET_MISSING_EA_FEATURE;
1097 err = ext2fs_get_memzero(sizeof(*h), &h);
1101 h->magic = EXT2_ET_MAGIC_EA_HANDLE;
1103 err = ext2fs_get_arrayzero(h->length, sizeof(struct ext2_xattr),
1106 ext2fs_free_mem(&h);
1116 errcode_t ext2fs_xattrs_close(struct ext2_xattr_handle **handle)
1118 struct ext2_xattr_handle *h = *handle;
1121 EXT2_CHECK_MAGIC(h, EXT2_ET_MAGIC_EA_HANDLE);
1123 err = ext2fs_xattrs_write(h);
1128 xattrs_free_keys(h);
1129 ext2fs_free_mem(&h->attrs);
1130 ext2fs_free_mem(handle);
1134 errcode_t ext2fs_xattrs_count(struct ext2_xattr_handle *handle, size_t *count)
1136 EXT2_CHECK_MAGIC(handle, EXT2_ET_MAGIC_EA_HANDLE);
1137 *count = handle->count;