#endif
#include <string.h>
#include <time.h>
+#include <errno.h>
#include "ext2_fs.h"
#include "ext2_ext_attr.h"
#undef NAME_HASH_SHIFT
#undef VALUE_HASH_SHIFT
+#define BLOCK_HASH_SHIFT 16
+/*
+ * Re-compute the extended attribute hash value after an entry has changed.
+ */
+static void ext2fs_attr_rehash(struct ext2_ext_attr_header *header,
+ struct ext2_ext_attr_entry *entry)
+{
+ struct ext2_ext_attr_entry *here;
+ __u32 hash = 0;
+
+ entry->e_hash = ext2fs_ext_attr_hash_entry(entry, (char *)header +
+ entry->e_value_offs);
+
+ here = ENTRY(header+1);
+ while (!EXT2_EXT_IS_LAST_ENTRY(here)) {
+ if (!here->e_hash) {
+ /* Block is not shared if an entry's hash value == 0 */
+ hash = 0;
+ break;
+ }
+ hash = (hash << BLOCK_HASH_SHIFT) ^
+ (hash >> (8*sizeof(hash) - BLOCK_HASH_SHIFT)) ^
+ here->e_hash;
+ here = EXT2_EXT_ATTR_NEXT(here);
+ }
+ header->h_hash = hash;
+}
+
errcode_t ext2fs_read_ext_attr2(ext2_filsys fs, blk64_t block, void *buf)
{
errcode_t retval;
if (retval)
goto errout;
- header = (struct ext2_ext_attr_header *) block_buf;
+ header = BHDR(block_buf);
+ if (header->h_magic != EXT2_EXT_ATTR_MAGIC)
+ return EXT2_ET_EA_BAD_MAGIC;
+
header->h_refcount += adjust;
if (newcount)
*newcount = header->h_refcount;
char *block_buf, int adjust,
__u32 *newcount)
{
- return ext2fs_adjust_ea_refcount(fs, blk, block_buf, adjust, newcount);
+ return ext2fs_adjust_ea_refcount2(fs, blk, block_buf, adjust, newcount);
+}
+
+struct ext2_attr_info {
+ int name_index;
+ const char *name;
+ const char *value;
+ int value_len;
+};
+
+struct ext2_attr_search {
+ struct ext2_ext_attr_entry *first;
+ char *base;
+ char *end;
+ struct ext2_ext_attr_entry *here;
+ int not_found;
+};
+
+struct ext2_attr_ibody_find {
+ ext2_ino_t ino;
+ struct ext2_attr_search s;
+};
+
+struct ext2_attr_block_find {
+ struct ext2_attr_search s;
+ char *block;
+};
+
+void ext2fs_attr_shift_entries(struct ext2_ext_attr_entry *entry,
+ int value_offs_shift, char *to,
+ char *from, int n)
+{
+ struct ext2_ext_attr_entry *last = entry;
+
+ /* Adjust the value offsets of the entries */
+ for (; !EXT2_EXT_IS_LAST_ENTRY(last); last = EXT2_EXT_ATTR_NEXT(last)) {
+ if (!last->e_value_block && last->e_value_size) {
+ last->e_value_offs = last->e_value_offs +
+ value_offs_shift;
+ }
+ }
+ /* Shift the entries by n bytes and zero freed space in inode */
+ memmove(to, from, n);
+ if (to > from)
+ memset(from, 0, to - from);
+}
+
+/*
+ * This function returns the free space present in the inode or the EA block.
+ * total is number of bytes taken up by the EA entries and is used to shift
+ * the EAs in ext2fs_expand_extra_isize().
+ */
+int ext2fs_attr_free_space(struct ext2_ext_attr_entry *last,
+ int *min_offs, char *base, int *total)
+{
+ for (; !EXT2_EXT_IS_LAST_ENTRY(last); last = EXT2_EXT_ATTR_NEXT(last)) {
+ *total += EXT2_EXT_ATTR_LEN(last->e_name_len);
+ if (!last->e_value_block && last->e_value_size) {
+ int offs = last->e_value_offs;
+ if (offs < *min_offs)
+ *min_offs = offs;
+ }
+ }
+
+ return *min_offs - ((char *)last - base) - sizeof(__u32);
+}
+
+static errcode_t ext2fs_attr_check_names(struct ext2_ext_attr_entry *entry,
+ char *end)
+{
+ while (!EXT2_EXT_IS_LAST_ENTRY(entry)) {
+ struct ext2_ext_attr_entry *next = EXT2_EXT_ATTR_NEXT(entry);
+ if ((char *)next >= end)
+ return EXT2_ET_EA_BAD_ENTRIES;
+ entry = next;
+ }
+ return 0;
+}
+
+static errcode_t ext2fs_attr_find_entry(struct ext2_ext_attr_entry **pentry,
+ int name_index, const char *name,
+ int size, int sorted)
+{
+ struct ext2_ext_attr_entry *entry;
+ int name_len;
+ int cmp = 1;
+
+ if (name == NULL)
+ return EXT2_ET_EA_BAD_NAME;
+
+ name_len = strlen(name);
+ entry = *pentry;
+ for (; !EXT2_EXT_IS_LAST_ENTRY(entry);
+ entry = EXT2_EXT_ATTR_NEXT(entry)) {
+ cmp = name_index - entry->e_name_index;
+ if (!cmp)
+ cmp = name_len - entry->e_name_len;
+ if (!cmp)
+ cmp = memcmp(name, entry->e_name, name_len);
+ if (cmp <= 0 && (sorted || cmp == 0))
+ break;
+ }
+ *pentry = entry;
+
+ return cmp ? EXT2_ET_EA_NAME_NOT_FOUND : 0;
+}
+
+static errcode_t ext2fs_attr_block_find(ext2_filsys fs,struct ext2_inode *inode,
+ struct ext2_attr_info *i,
+ struct ext2_attr_block_find *bs)
+{
+ struct ext2_ext_attr_header *header;
+ errcode_t error;
+
+ if (inode->i_file_acl) {
+ /* The inode already has an extended attribute block. */
+ error = ext2fs_get_mem(fs->blocksize, &bs->block);
+ if (error)
+ return error;
+ error = ext2fs_read_ext_attr(fs, inode->i_file_acl, bs->block);
+ if (error)
+ goto cleanup;
+
+ header = BHDR(bs->block);
+ if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
+ error = EXT2_ET_EA_BAD_MAGIC;
+ goto cleanup;
+ }
+
+ /* Find the named attribute. */
+ bs->s.base = bs->block;
+ bs->s.first = (struct ext2_ext_attr_entry *)(header + 1);
+ bs->s.end = bs->block + fs->blocksize;
+ bs->s.here = bs->s.first;
+ error = ext2fs_attr_find_entry(&bs->s.here, i->name_index,
+ i->name, fs->blocksize, 1);
+ if (error && error != EXT2_ET_EA_NAME_NOT_FOUND)
+ goto cleanup;
+ bs->s.not_found = error;
+ }
+ error = 0;
+
+cleanup:
+ if (error && bs->block)
+ ext2fs_free_mem(&bs->block);
+ return error;
+}
+
+static errcode_t ext2fs_attr_ibody_find(ext2_filsys fs,
+ struct ext2_inode_large *inode,
+ struct ext2_attr_info *i,
+ struct ext2_attr_ibody_find *is)
+{
+ __u32 *eamagic;
+ char *start;
+ errcode_t error;
+
+ if (EXT2_INODE_SIZE(fs->super) == EXT2_GOOD_OLD_INODE_SIZE)
+ return 0;
+
+ if (inode->i_extra_isize == 0)
+ return 0;
+ eamagic = IHDR(inode);
+
+ start = (char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
+ inode->i_extra_isize + sizeof(__u32);
+ is->s.first = (struct ext2_ext_attr_entry *)start;
+ is->s.base = start;
+ is->s.here = is->s.first;
+ is->s.end = (char *)inode + EXT2_INODE_SIZE(fs->super);
+ if (*eamagic == EXT2_EXT_ATTR_MAGIC) {
+ error = ext2fs_attr_check_names((struct ext2_ext_attr_entry *)
+ start, is->s.end);
+ if (error)
+ return error;
+ /* Find the named attribute. */
+ error = ext2fs_attr_find_entry(&is->s.here, i->name_index,
+ i->name, is->s.end -
+ (char *)is->s.base, 0);
+ if (error && error != EXT2_ET_EA_NAME_NOT_FOUND)
+ return error;
+ is->s.not_found = error;
+ }
+
+ return 0;
+}
+
+static errcode_t ext2fs_attr_set_entry(ext2_filsys fs, struct ext2_attr_info *i,
+ struct ext2_attr_search *s)
+{
+ struct ext2_ext_attr_entry *last;
+ int free, min_offs = s->end - s->base, name_len = strlen(i->name);
+
+ /* Compute min_offs and last. */
+ for (last = s->first; !EXT2_EXT_IS_LAST_ENTRY(last);
+ last = EXT2_EXT_ATTR_NEXT(last)) {
+ if (!last->e_value_block && last->e_value_size) {
+ int offs = last->e_value_offs;
+
+ if (offs < min_offs)
+ min_offs = offs;
+ }
+ }
+ free = min_offs - ((char *)last - s->base) - sizeof(__u32);
+
+ if (!s->not_found) {
+ if (!s->here->e_value_block && s->here->e_value_size) {
+ int size = s->here->e_value_size;
+ free += EXT2_EXT_ATTR_SIZE(size);
+ }
+ free += EXT2_EXT_ATTR_LEN(name_len);
+ }
+ if (i->value) {
+ if (free < EXT2_EXT_ATTR_LEN(name_len) +
+ EXT2_EXT_ATTR_SIZE(i->value_len))
+ return EXT2_ET_EA_NO_SPACE;
+ }
+
+ if (i->value && s->not_found) {
+ /* Insert the new name. */
+ int size = EXT2_EXT_ATTR_LEN(name_len);
+ int rest = (char *)last - (char *)s->here + sizeof(__u32);
+
+ memmove((char *)s->here + size, s->here, rest);
+ memset(s->here, 0, size);
+ s->here->e_name_index = i->name_index;
+ s->here->e_name_len = name_len;
+ memcpy(s->here->e_name, i->name, name_len);
+ } else {
+ if (!s->here->e_value_block && s->here->e_value_size) {
+ char *first_val = s->base + min_offs;
+ int offs = s->here->e_value_offs;
+ char *val = s->base + offs;
+ int size = EXT2_EXT_ATTR_SIZE(s->here->e_value_size);
+
+ if (i->value &&
+ size == EXT2_EXT_ATTR_SIZE(i->value_len)) {
+ /* The old and the new value have the same
+ size. Just replace. */
+ s->here->e_value_size = i->value_len;
+ memset(val + size - EXT2_EXT_ATTR_PAD, 0,
+ EXT2_EXT_ATTR_PAD); /* Clear pad bytes */
+ memcpy(val, i->value, i->value_len);
+ return 0;
+ }
+
+ /* Remove the old value. */
+ memmove(first_val + size, first_val, val - first_val);
+ memset(first_val, 0, size);
+ s->here->e_value_size = 0;
+ s->here->e_value_offs = 0;
+ min_offs += size;
+
+ /* Adjust all value offsets. */
+ last = s->first;
+ while (!EXT2_EXT_IS_LAST_ENTRY(last)) {
+ int o = last->e_value_offs;
+
+ if (!last->e_value_block &&
+ last->e_value_size && o < offs)
+ last->e_value_offs = o + size;
+ last = EXT2_EXT_ATTR_NEXT(last);
+ }
+ }
+ if (!i->value) {
+ /* Remove the old name. */
+ int size = EXT2_EXT_ATTR_LEN(name_len);
+
+ last = ENTRY((char *)last - size);
+ memmove((char *)s->here, (char *)s->here + size,
+ (char *)last - (char *)s->here + sizeof(__u32));
+ memset(last, 0, size);
+ }
+ }
+
+ if (i->value) {
+ /* Insert the new value. */
+ s->here->e_value_size = i->value_len;
+ if (i->value_len) {
+ int size = EXT2_EXT_ATTR_SIZE(i->value_len);
+ char *val = s->base + min_offs - size;
+
+ s->here->e_value_offs = min_offs - size;
+ memset(val + size - EXT2_EXT_ATTR_PAD, 0,
+ EXT2_EXT_ATTR_PAD); /* Clear the pad bytes. */
+ memcpy(val, i->value, i->value_len);
+ }
+ }
+
+ return 0;
+}
+
+static errcode_t ext2fs_attr_block_set(ext2_filsys fs, struct ext2_inode *inode,
+ struct ext2_attr_info *i,
+ struct ext2_attr_block_find *bs)
+{
+ struct ext2_attr_search *s = &bs->s;
+ char *new_buf = NULL, *old_block = NULL;
+ blk_t blk;
+ int clear_flag = 0;
+ errcode_t error;
+
+ if (i->value && i->value_len > fs->blocksize)
+ return EXT2_ET_EA_NO_SPACE;
+
+ if (s->base) {
+ if (BHDR(s->base)->h_refcount != 1) {
+ int offset = (char *)s->here - bs->block;
+
+ /* Decrement the refcount of the shared block */
+ old_block = s->base;
+ BHDR(s->base)->h_refcount -= 1;
+
+ error = ext2fs_get_mem(fs->blocksize, &s->base);
+ if (error)
+ goto cleanup;
+ clear_flag = 1;
+ memcpy(s->base, bs->block, fs->blocksize);
+ s->first = ENTRY(BHDR(s->base)+1);
+ BHDR(s->base)->h_refcount = 1;
+ s->here = ENTRY(s->base + offset);
+ s->end = s->base + fs->blocksize;
+ }
+ } else {
+ error = ext2fs_get_mem(fs->blocksize, &s->base);
+ if (error)
+ goto cleanup;
+ clear_flag = 1;
+ memset(s->base, 0, fs->blocksize);
+ BHDR(s->base)->h_magic = EXT2_EXT_ATTR_MAGIC;
+ BHDR(s->base)->h_blocks = 1;
+ BHDR(s->base)->h_refcount = 1;
+ s->first = ENTRY(BHDR(s->base)+1);
+ s->here = ENTRY(BHDR(s->base)+1);
+ s->end = s->base + fs->blocksize;
+ }
+
+ error = ext2fs_attr_set_entry(fs, i, s);
+ if (error)
+ goto cleanup;
+
+ if (!EXT2_EXT_IS_LAST_ENTRY(s->first))
+ ext2fs_attr_rehash(BHDR(s->base), s->here);
+
+ if (!EXT2_EXT_IS_LAST_ENTRY(s->first)) {
+ if (bs->block && bs->block == s->base) {
+ /* We are modifying this block in-place */
+ new_buf = bs->block;
+ blk = inode->i_file_acl;
+ error = ext2fs_write_ext_attr(fs, blk, s->base);
+ if (error)
+ goto cleanup;
+ } else {
+ /* We need to allocate a new block */
+ error = ext2fs_new_block(fs, 0, 0, &blk);
+ if (error)
+ goto cleanup;
+ ext2fs_block_alloc_stats(fs, blk, 1);
+ error = ext2fs_write_ext_attr(fs, blk, s->base);
+ if (error)
+ goto cleanup;
+ new_buf = s->base;
+ if (old_block) {
+ BHDR(s->base)->h_refcount -= 1;
+ error = ext2fs_write_ext_attr(fs,
+ inode->i_file_acl,
+ s->base);
+ if (error)
+ goto cleanup;
+ }
+ }
+ }
+
+ /* Update the i_blocks if we added a new EA block */
+ if (!inode->i_file_acl && new_buf)
+ inode->i_blocks += fs->blocksize / 512;
+ /* Update the inode. */
+ inode->i_file_acl = new_buf ? blk : 0;
+
+cleanup:
+ if (clear_flag)
+ ext2fs_free_mem(&s->base);
+ return 0;
+}
+
+static errcode_t ext2fs_attr_ibody_set(ext2_filsys fs,
+ struct ext2_inode_large *inode,
+ struct ext2_attr_info *i,
+ struct ext2_attr_ibody_find *is)
+{
+ __u32 *eamagic;
+ struct ext2_attr_search *s = &is->s;
+ errcode_t error;
+
+ if (EXT2_INODE_SIZE(fs->super) == EXT2_GOOD_OLD_INODE_SIZE)
+ return EXT2_ET_EA_NO_SPACE;
+
+ error = ext2fs_attr_set_entry(fs, i, s);
+ if (error)
+ return error;
+
+ eamagic = IHDR(inode);
+ if (!EXT2_EXT_IS_LAST_ENTRY(s->first))
+ *eamagic = EXT2_EXT_ATTR_MAGIC;
+ else
+ *eamagic = 0;
+
+ return ext2fs_write_inode_full(fs, is->ino, (struct ext2_inode *)inode,
+ EXT2_INODE_SIZE(fs->super));
+}
+
+static struct {
+ char str[28];
+ int len;
+} ext2_attr_index_prefix[] = {
+ [EXT2_ATTR_INDEX_USER] = { EXT2_ATTR_INDEX_USER_PREFIX,
+ sizeof(EXT2_ATTR_INDEX_USER_PREFIX) },
+ [EXT2_ATTR_INDEX_POSIX_ACL_ACCESS] = {
+ EXT2_ATTR_INDEX_POSIX_ACL_ACCESS_PREFIX,
+ sizeof(EXT2_ATTR_INDEX_POSIX_ACL_ACCESS_PREFIX) },
+ [EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT] = {
+ EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT_PREFIX,
+ sizeof(EXT2_ATTR_INDEX_POSIX_ACL_DEFAULT_PREFIX) },
+ [EXT2_ATTR_INDEX_TRUSTED] = { EXT2_ATTR_INDEX_TRUSTED_PREFIX,
+ sizeof(EXT2_ATTR_INDEX_TRUSTED_PREFIX) },
+ [EXT2_ATTR_INDEX_LUSTRE] = { EXT2_ATTR_INDEX_LUSTRE_PREFIX,
+ sizeof(EXT2_ATTR_INDEX_LUSTRE_PREFIX) },
+ [EXT2_ATTR_INDEX_SECURITY] = { EXT2_ATTR_INDEX_SECURITY_PREFIX,
+ sizeof(EXT2_ATTR_INDEX_SECURITY_PREFIX)},
+ { "", 0 }
+};
+
+errcode_t ext2fs_attr_set(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode *inode,
+ int name_index, const char *name, const char *value,
+ int value_len, int flags)
+{
+ struct ext2_inode_large *inode_large = NULL;
+ struct ext2_attr_info i = {
+ .name_index = name_index,
+ .name = name,
+ .value = value,
+ .value_len = value_len,
+ };
+ struct ext2_attr_ibody_find is = {
+ .ino = ino,
+ .s = { .not_found = -ENODATA, },
+ };
+ struct ext2_attr_block_find bs = {
+ .s = { .not_found = -ENODATA, },
+ };
+ errcode_t error;
+
+ if (!name)
+ return EXT2_ET_EA_BAD_NAME;
+ if (strlen(name) > 255)
+ return EXT2_ET_EA_NAME_TOO_BIG;
+
+ /* If the prefix is still present, skip it */
+ if (strncmp(name, ext2_attr_index_prefix[name_index].str,
+ ext2_attr_index_prefix[name_index].len) == 0)
+ i.name += ext2_attr_index_prefix[name_index].len;
+
+ if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE) {
+ inode_large = (struct ext2_inode_large *)inode;
+
+ error = ext2fs_attr_ibody_find(fs, inode_large, &i, &is);
+ if (error)
+ goto cleanup;
+ }
+ if (is.s.not_found) {
+ error = ext2fs_attr_block_find(fs, inode, &i, &bs);
+ if (error)
+ goto cleanup;
+ }
+
+ if (is.s.not_found && bs.s.not_found) {
+ error = EXT2_ET_EA_NAME_NOT_FOUND;
+ if (flags & XATTR_REPLACE)
+ goto cleanup;
+ error = 0;
+ if (!value)
+ goto cleanup;
+ } else {
+ error = EXT2_ET_EA_NAME_EXISTS;
+ if (flags & XATTR_CREATE)
+ goto cleanup;
+ }
+
+ if (!value) {
+ if (!is.s.not_found &&
+ (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE))
+ error = ext2fs_attr_ibody_set(fs, inode_large, &i, &is);
+ else if (!bs.s.not_found)
+ error = ext2fs_attr_block_set(fs, inode, &i, &bs);
+ } else {
+ if (EXT2_INODE_SIZE(fs->super) > EXT2_GOOD_OLD_INODE_SIZE)
+ error = ext2fs_attr_ibody_set(fs, inode_large, &i, &is);
+ if (!error && !bs.s.not_found) {
+ i.value = NULL;
+ error = ext2fs_attr_block_set(fs, inode, &i, &bs);
+ } else if (error == EXT2_ET_EA_NO_SPACE) {
+ error = ext2fs_attr_block_set(fs, inode, &i, &bs);
+ if (error)
+ goto cleanup;
+ if (!is.s.not_found) {
+ i.value = NULL;
+ if (EXT2_INODE_SIZE(fs->super) >
+ EXT2_GOOD_OLD_INODE_SIZE)
+ error = ext2fs_attr_ibody_set(fs,
+ inode_large, &i, &is);
+ }
+ }
+ }
+
+cleanup:
+ return error;
+}
+
+static errcode_t ext2fs_attr_check_block(ext2_filsys fs, char *buffer)
+{
+ if (BHDR(buffer)->h_magic != (EXT2_EXT_ATTR_MAGIC) ||
+ BHDR(buffer)->h_blocks != 1)
+ return EXT2_ET_EA_BAD_MAGIC;
+
+ return ext2fs_attr_check_names((struct ext2_ext_attr_entry *)
+ (BHDR(buffer) + 1),
+ buffer + fs->blocksize);
+}
+
+static errcode_t ext2fs_attr_block_get(ext2_filsys fs, struct ext2_inode *inode,
+ int name_index, const char *name,
+ void *buffer, size_t buffer_size,
+ int *easize)
+{
+ struct ext2_ext_attr_header *header = NULL;
+ struct ext2_ext_attr_entry *entry;
+ char *block_buf = NULL;
+ errcode_t error;
+
+ error = EXT2_ET_EA_NAME_NOT_FOUND;
+ if (!inode->i_file_acl)
+ goto cleanup;
+
+ error = ext2fs_get_mem(fs->blocksize, &block_buf);
+ if (error)
+ return error;
+ error = ext2fs_read_ext_attr(fs, inode->i_file_acl, block_buf);
+ if (error)
+ goto cleanup;
+
+ error = ext2fs_attr_check_block(fs, block_buf);
+ if (error)
+ goto cleanup;
+
+ header = BHDR(block_buf);
+ entry = (struct ext2_ext_attr_entry *)(header+1);
+ error = ext2fs_attr_find_entry(&entry, name_index, name,
+ fs->blocksize, 1);
+ if (error)
+ goto cleanup;
+ if (easize)
+ *easize = entry->e_value_size;
+ if (buffer) {
+ error = EXT2_ET_EA_TOO_BIG;
+ if (entry->e_value_size > buffer_size)
+ goto cleanup;
+ memcpy(buffer, block_buf + entry->e_value_offs,
+ entry->e_value_size);
+ }
+
+cleanup:
+ if (block_buf)
+ ext2fs_free_mem(&block_buf);
+ return error;
+}
+
+static errcode_t ext2fs_attr_ibody_get(ext2_filsys fs,
+ struct ext2_inode_large *inode,
+ int name_index, const char *name,
+ void *buffer, size_t buffer_size,
+ int *easize)
+{
+ struct ext2_ext_attr_entry *entry;
+ int error;
+ char *end, *start;
+ __u32 *eamagic;
+
+ if (EXT2_INODE_SIZE(fs->super) == EXT2_GOOD_OLD_INODE_SIZE)
+ return EXT2_ET_EA_NAME_NOT_FOUND;
+
+ eamagic = IHDR(inode);
+ error = ext2fs_attr_check_block(fs, buffer);
+ if (error)
+ return error;
+
+ start = (char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
+ inode->i_extra_isize + sizeof(__u32);
+ entry = (struct ext2_ext_attr_entry *)start;
+ end = (char *)inode + EXT2_INODE_SIZE(fs->super);
+ error = ext2fs_attr_check_names(entry, end);
+ if (error)
+ goto cleanup;
+ error = ext2fs_attr_find_entry(&entry, name_index, name,
+ end - (char *)entry, 0);
+ if (error)
+ goto cleanup;
+ if (easize)
+ *easize = entry->e_value_size;
+ if (buffer) {
+ error = EXT2_ET_EA_TOO_BIG;
+ if (entry->e_value_size > buffer_size)
+ goto cleanup;
+ memcpy(buffer, start + entry->e_value_offs,entry->e_value_size);
+ }
+
+cleanup:
+ return error;
+}
+
+
+errcode_t ext2fs_attr_get(ext2_filsys fs, struct ext2_inode *inode,
+ int name_index, const char *name, char *buffer,
+ size_t buffer_size, int *easize)
+{
+ errcode_t error;
+
+ error = ext2fs_attr_ibody_get(fs, (struct ext2_inode_large *)inode,
+ name_index, name, buffer, buffer_size,
+ easize);
+ if (error == EXT2_ET_EA_NAME_NOT_FOUND)
+ error = ext2fs_attr_block_get(fs, inode, name_index, name,
+ buffer, buffer_size, easize);
+
+ return error;
+}
+
+int ext2fs_attr_get_next_attr(struct ext2_ext_attr_entry *entry, int name_index,
+ char *buffer, int buffer_size, int start)
+{
+ const int prefix_len = ext2_attr_index_prefix[name_index].len;
+ int total_len;
+
+ if (!start && !EXT2_EXT_IS_LAST_ENTRY(entry))
+ entry = EXT2_EXT_ATTR_NEXT(entry);
+
+ for (; !EXT2_EXT_IS_LAST_ENTRY(entry);
+ entry = EXT2_EXT_ATTR_NEXT(entry)) {
+ if (!name_index)
+ break;
+ if (name_index == entry->e_name_index)
+ break;
+ }
+ if (EXT2_EXT_IS_LAST_ENTRY(entry))
+ return 0;
+
+ total_len = prefix_len + entry->e_name_len + 1;
+ if (buffer && total_len <= buffer_size) {
+ memcpy(buffer, ext2_attr_index_prefix[name_index].str,
+ prefix_len);
+ memcpy(buffer + prefix_len, entry->e_name, entry->e_name_len);
+ buffer[prefix_len + entry->e_name_len] = '\0';
+ }
+
+ return total_len;
+}
+
+errcode_t ext2fs_expand_extra_isize(ext2_filsys fs, ext2_ino_t ino,
+ struct ext2_inode_large *inode,
+ int new_extra_isize, int *ret,
+ int *needed_size)
+{
+ struct ext2_inode *inode_buf = NULL;
+ __u32 *eamagic = NULL;
+ struct ext2_ext_attr_header *header = NULL;
+ struct ext2_ext_attr_entry *entry = NULL, *last = NULL;
+ struct ext2_attr_ibody_find is = {
+ .ino = ino,
+ .s = { .not_found = EXT2_ET_EA_NO_SPACE, },
+ };
+ struct ext2_attr_block_find bs = {
+ .s = { .not_found = EXT2_ET_EA_NO_SPACE, },
+ };
+ char *start, *end, *block_buf = NULL, *buffer =NULL, *b_entry_name=NULL;
+ int total_ino = 0, total_blk, free, offs, tried_min_extra_isize = 0;
+ int s_min_extra_isize = fs->super->s_min_extra_isize;
+ errcode_t error = 0;
+
+ if (needed_size)
+ *needed_size = new_extra_isize;
+ error = ext2fs_get_mem(fs->blocksize, &block_buf);
+ if (error)
+ return error;
+
+ if (inode == NULL) {
+ error = ext2fs_get_mem(EXT2_INODE_SIZE(fs->super), &inode_buf);
+ if (error)
+ goto cleanup;
+
+ error = ext2fs_read_inode_full(fs, ino, inode_buf,
+ EXT2_INODE_SIZE(fs->super));
+ if (error)
+ goto cleanup;
+
+ inode = (struct ext2_inode_large *)inode_buf;
+ }
+
+retry:
+ if (inode->i_extra_isize >= new_extra_isize)
+ goto cleanup;
+
+ eamagic = IHDR(inode);
+ start = (char *)inode + EXT2_GOOD_OLD_INODE_SIZE + inode->i_extra_isize;
+ /* No extended attributes present */
+ if (*eamagic != EXT2_EXT_ATTR_MAGIC) {
+ memset(start, 0,
+ EXT2_INODE_SIZE(fs->super) - EXT2_GOOD_OLD_INODE_SIZE -
+ inode->i_extra_isize);
+ inode->i_extra_isize = new_extra_isize;
+ if (needed_size)
+ *needed_size = 0;
+ goto write_inode;
+ }
+
+ start += sizeof(__u32);
+ end = (char *)inode + EXT2_INODE_SIZE(fs->super);
+ last = entry = (struct ext2_ext_attr_entry *)start;
+ offs = end - start;
+ /* Consider space takenup by magic number */
+ total_ino = sizeof(__u32);
+ free = ext2fs_attr_free_space(last, &offs, start, &total_ino);
+
+ /* Enough free space available in the inode for expansion */
+ if (free >= new_extra_isize) {
+ ext2fs_attr_shift_entries(entry,
+ inode->i_extra_isize - new_extra_isize,
+ (char *)inode +
+ EXT2_GOOD_OLD_INODE_SIZE +
+ new_extra_isize,
+ start - sizeof(__u32), total_ino);
+ inode->i_extra_isize = new_extra_isize;
+ if (needed_size)
+ *needed_size = 0;
+ goto write_inode;
+ }
+
+ if (inode->i_file_acl) {
+ error = ext2fs_read_ext_attr(fs, inode->i_file_acl, block_buf);
+ if (error)
+ goto cleanup;
+
+ header = BHDR(block_buf);
+ if (header->h_magic != EXT2_EXT_ATTR_MAGIC) {
+ error = EXT2_ET_EA_BAD_MAGIC;
+ goto cleanup;
+ }
+ end = block_buf + fs->blocksize;
+ last = entry = (struct ext2_ext_attr_entry *)(header+1);
+ start = (char *)entry;
+ offs = end - start;
+ free = ext2fs_attr_free_space(last, &offs, start, &total_blk);
+ if (free < new_extra_isize) {
+ if (!tried_min_extra_isize && s_min_extra_isize) {
+ tried_min_extra_isize++;
+ new_extra_isize = s_min_extra_isize;
+ goto retry;
+ }
+ if (ret)
+ *ret = EXT2_EXPAND_EISIZE_NOSPC;
+ error = EXT2_ET_EA_NO_SPACE;
+ goto cleanup;
+ }
+ } else {
+ if (ret && *ret == EXT2_EXPAND_EISIZE_UNSAFE) {
+ *ret = EXT2_EXPAND_EISIZE_NEW_BLOCK;
+ error = 0;
+ goto cleanup;
+ }
+ free = fs->blocksize;
+ }
+
+ while (new_extra_isize > 0) {
+ int offs, size, entry_size;
+ struct ext2_ext_attr_entry *small_entry = NULL;
+ struct ext2_attr_info i = {
+ .value = NULL,
+ .value_len = 0,
+ };
+ unsigned int total_size, shift_bytes, temp = ~0U, extra_isize=0;
+
+ start = (char *)inode + EXT2_GOOD_OLD_INODE_SIZE +
+ inode->i_extra_isize + sizeof(__u32);
+ end = (char *)inode + EXT2_INODE_SIZE(fs->super);
+ last = (struct ext2_ext_attr_entry *)start;
+
+ /* Find the entry best suited to be pushed into EA block */
+ entry = NULL;
+ for (; !EXT2_EXT_IS_LAST_ENTRY(last);
+ last = EXT2_EXT_ATTR_NEXT(last)) {
+ total_size = EXT2_EXT_ATTR_SIZE(last->e_value_size) +
+ EXT2_EXT_ATTR_LEN(last->e_name_len);
+ if (total_size <= free && total_size < temp) {
+ if (total_size < new_extra_isize) {
+ small_entry = last;
+ } else {
+ entry = last;
+ temp = total_size;
+ }
+ }
+ }
+
+ if (entry == NULL) {
+ if (small_entry) {
+ entry = small_entry;
+ } else {
+ if (!tried_min_extra_isize &&
+ s_min_extra_isize) {
+ tried_min_extra_isize++;
+ new_extra_isize = s_min_extra_isize;
+ goto retry;
+ }
+ if (ret)
+ *ret = EXT2_EXPAND_EISIZE_NOSPC;
+ error = EXT2_ET_EA_NO_SPACE;
+ goto cleanup;
+ }
+ }
+ offs = entry->e_value_offs;
+ size = entry->e_value_size;
+ entry_size = EXT2_EXT_ATTR_LEN(entry->e_name_len);
+ i.name_index = entry->e_name_index;
+ error = ext2fs_get_mem(size, &buffer);
+ if (error)
+ goto cleanup;
+ error = ext2fs_get_mem(entry->e_name_len + 1, &b_entry_name);
+ if (error)
+ goto cleanup;
+ /* Save the entry name and the entry value */
+ memcpy((char *)buffer, (char *)start + offs,
+ EXT2_EXT_ATTR_SIZE(size));
+ memcpy((char *)b_entry_name, (char *)entry->e_name,
+ entry->e_name_len);
+ b_entry_name[entry->e_name_len] = '\0';
+ i.name = b_entry_name;
+
+ error = ext2fs_attr_ibody_find(fs, inode, &i, &is);
+ if (error)
+ goto cleanup;
+
+ error = ext2fs_attr_set_entry(fs, &i, &is.s);
+ if (error)
+ goto cleanup;
+
+ entry = (struct ext2_ext_attr_entry *)start;
+ if (entry_size + EXT2_EXT_ATTR_SIZE(size) >= new_extra_isize)
+ shift_bytes = new_extra_isize;
+ else
+ shift_bytes = entry_size + EXT2_EXT_ATTR_SIZE(size);
+ ext2fs_attr_shift_entries(entry,
+ inode->i_extra_isize - shift_bytes,
+ (char *)inode +EXT2_GOOD_OLD_INODE_SIZE+
+ extra_isize + shift_bytes,
+ start - sizeof(__u32),
+ total_ino - entry_size);
+
+ extra_isize += shift_bytes;
+ new_extra_isize -= shift_bytes;
+ if (needed_size)
+ *needed_size = new_extra_isize;
+ inode->i_extra_isize = extra_isize;
+
+ i.name = b_entry_name;
+ i.value = buffer;
+ i.value_len = size;
+ error = ext2fs_attr_block_find(fs, (struct ext2_inode *)inode,
+ &i, &bs);
+ if (error)
+ goto cleanup;
+
+ /* Add entry which was removed from the inode into the block */
+ error = ext2fs_attr_block_set(fs, (struct ext2_inode *)inode,
+ &i, &bs);
+ if (error)
+ goto cleanup;
+ }
+
+write_inode:
+ error = ext2fs_write_inode_full(fs, ino, (struct ext2_inode *)inode,
+ EXT2_INODE_SIZE(fs->super));
+cleanup:
+ if (inode_buf)
+ ext2fs_free_mem(&inode_buf);
+ if (block_buf)
+ ext2fs_free_mem(&block_buf);
+ if (buffer)
+ ext2fs_free_mem(&buffer);
+ if (b_entry_name)
+ ext2fs_free_mem(&b_entry_name);
+
+ return error;
}
git://git.whamcloud.com / tools / e2fsprogs.git / blobdiff