}
while (!IS_LAST_ENTRY(entry)) {
+ if (entry->e_value_block != 0)
+ return -EFSCORRUPTED;
if (entry->e_value_size != 0 &&
(value_start + le16_to_cpu(entry->e_value_offs) <
(void *)e + sizeof(__u32) ||
size_t *min_offs, void *base, int *total)
{
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
- if (!last->e_value_block && last->e_value_size) {
+ if (last->e_value_size) {
size_t offs = le16_to_cpu(last->e_value_offs);
if (offs < *min_offs)
*min_offs = offs;
/* Compute min_offs and last. */
last = s->first;
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
- if (!last->e_value_block && last->e_value_size) {
+ if (last->e_value_size) {
size_t offs = le16_to_cpu(last->e_value_offs);
if (offs < min_offs)
min_offs = offs;
}
free = min_offs - ((void *)last - s->base) - sizeof(__u32);
if (!s->not_found) {
- if (!s->here->e_value_block && s->here->e_value_size) {
+ if (s->here->e_value_size) {
size_t size = le32_to_cpu(s->here->e_value_size);
free += EXT4_XATTR_SIZE(size);
}
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) {
+ if (s->here->e_value_size) {
void *first_val = s->base + min_offs;
size_t offs = le16_to_cpu(s->here->e_value_offs);
void *val = s->base + offs;
last = s->first;
while (!IS_LAST_ENTRY(last)) {
size_t o = le16_to_cpu(last->e_value_offs);
- if (!last->e_value_block &&
- last->e_value_size && o < offs)
+ if (last->e_value_size && o < offs)
last->e_value_offs =
cpu_to_le16(o + size);
last = EXT4_XATTR_NEXT(last);
*/
static void ext4_xattr_shift_entries(struct ext4_xattr_entry *entry,
int value_offs_shift, void *to,
- void *from, size_t n, int blocksize)
+ void *from, size_t n)
{
struct ext4_xattr_entry *last = entry;
int new_offs;
+ /* We always shift xattr headers further thus offsets get lower */
+ BUG_ON(value_offs_shift > 0);
+
/* Adjust the value offsets of the entries */
for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
- if (!last->e_value_block && last->e_value_size) {
+ if (last->e_value_size) {
new_offs = le16_to_cpu(last->e_value_offs) +
value_offs_shift;
- BUG_ON(new_offs + le32_to_cpu(last->e_value_size)
- > blocksize);
last->e_value_offs = cpu_to_le16(new_offs);
}
}
memmove(to, from, n);
}
+/*
+ * Move xattr pointed to by 'entry' from inode into external xattr block
+ */
+static int ext4_xattr_move_to_block(handle_t *handle, struct inode *inode,
+ struct ext4_inode *raw_inode,
+ struct ext4_xattr_entry *entry)
+{
+ struct ext4_xattr_ibody_find *is = NULL;
+ struct ext4_xattr_block_find *bs = NULL;
+ char *buffer = NULL, *b_entry_name = NULL;
+ size_t value_offs, value_size;
+ struct ext4_xattr_info i = {
+ .value = NULL,
+ .value_len = 0,
+ .name_index = entry->e_name_index,
+ };
+ struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode);
+ int error;
+
+ value_offs = le16_to_cpu(entry->e_value_offs);
+ value_size = le32_to_cpu(entry->e_value_size);
+
+ is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
+ bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
+ buffer = kmalloc(value_size, GFP_NOFS);
+ b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
+ if (!is || !bs || !buffer || !b_entry_name) {
+ error = -ENOMEM;
+ goto out;
+ }
+
+ is->s.not_found = -ENODATA;
+ bs->s.not_found = -ENODATA;
+ is->iloc.bh = NULL;
+ bs->bh = NULL;
+
+ /* Save the entry name and the entry value */
+ memcpy(buffer, (void *)IFIRST(header) + value_offs, value_size);
+ memcpy(b_entry_name, entry->e_name, entry->e_name_len);
+ b_entry_name[entry->e_name_len] = '\0';
+ i.name = b_entry_name;
+
+ error = ext4_get_inode_loc(inode, &is->iloc);
+ if (error)
+ goto out;
+
+ error = ext4_xattr_ibody_find(inode, &i, is);
+ if (error)
+ goto out;
+
+ /* Remove the chosen entry from the inode */
+ error = ext4_xattr_ibody_set(handle, inode, &i, is);
+ if (error)
+ goto out;
+
+ i.name = b_entry_name;
+ i.value = buffer;
+ i.value_len = value_size;
+ error = ext4_xattr_block_find(inode, &i, bs);
+ if (error)
+ goto out;
+
+ /* Add entry which was removed from the inode into the block */
+ error = ext4_xattr_block_set(handle, inode, &i, bs);
+ if (error)
+ goto out;
+ error = 0;
+out:
+ kfree(b_entry_name);
+ kfree(buffer);
+ if (is)
+ brelse(is->iloc.bh);
+ kfree(is);
+ kfree(bs);
+
+ return error;
+}
+
+static int ext4_xattr_make_inode_space(handle_t *handle, struct inode *inode,
+ struct ext4_inode *raw_inode,
+ int isize_diff, size_t ifree,
+ size_t bfree, int *total_ino)
+{
+ struct ext4_xattr_ibody_header *header = IHDR(inode, raw_inode);
+ struct ext4_xattr_entry *small_entry;
+ struct ext4_xattr_entry *entry;
+ struct ext4_xattr_entry *last;
+ unsigned int entry_size; /* EA entry size */
+ unsigned int total_size; /* EA entry size + value size */
+ unsigned int min_total_size;
+ int error;
+
+ while (isize_diff > ifree) {
+ entry = NULL;
+ small_entry = NULL;
+ min_total_size = ~0U;
+ last = IFIRST(header);
+ /* Find the entry best suited to be pushed into EA block */
+ for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
+ total_size =
+ EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) +
+ EXT4_XATTR_LEN(last->e_name_len);
+ if (total_size <= bfree &&
+ total_size < min_total_size) {
+ if (total_size + ifree < isize_diff) {
+ small_entry = last;
+ } else {
+ entry = last;
+ min_total_size = total_size;
+ }
+ }
+ }
+
+ if (entry == NULL) {
+ if (small_entry == NULL)
+ return -ENOSPC;
+ entry = small_entry;
+ }
+
+ entry_size = EXT4_XATTR_LEN(entry->e_name_len);
+ total_size = entry_size +
+ EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
+ error = ext4_xattr_move_to_block(handle, inode, raw_inode,
+ entry);
+ if (error)
+ return error;
+
+ *total_ino -= entry_size;
+ ifree += total_size;
+ bfree -= total_size;
+ }
+
+ return 0;
+}
+
/*
* Expand an inode by new_extra_isize bytes when EAs are present.
* Returns 0 on success or negative error number on failure.
struct ext4_inode *raw_inode, handle_t *handle)
{
struct ext4_xattr_ibody_header *header;
- struct ext4_xattr_entry *entry, *last, *first;
struct buffer_head *bh = NULL;
- struct ext4_xattr_ibody_find *is = NULL;
- struct ext4_xattr_block_find *bs = NULL;
- char *buffer = NULL, *b_entry_name = NULL;
- size_t min_offs, free;
+ size_t min_offs;
+ size_t ifree, bfree;
int total_ino;
- void *base, *start, *end;
+ void *base, *end;
int error = 0, tried_min_extra_isize = 0;
int s_min_extra_isize = le16_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_min_extra_isize);
int isize_diff; /* How much do we need to grow i_extra_isize */
goto out;
header = IHDR(inode, raw_inode);
- entry = IFIRST(header);
/*
* Check if enough free space is available in the inode to shift the
* entries ahead by new_extra_isize.
*/
- base = start = entry;
+ base = IFIRST(header);
end = (void *)raw_inode + EXT4_SB(inode->i_sb)->s_inode_size;
min_offs = end - base;
- last = entry;
total_ino = sizeof(struct ext4_xattr_ibody_header);
error = xattr_check_inode(inode, header, end);
if (error)
goto cleanup;
- free = ext4_xattr_free_space(last, &min_offs, base, &total_ino);
- if (free >= isize_diff) {
- entry = IFIRST(header);
- ext4_xattr_shift_entries(entry, EXT4_I(inode)->i_extra_isize
- - new_extra_isize, (void *)raw_inode +
- EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
- (void *)header, total_ino,
- inode->i_sb->s_blocksize);
- EXT4_I(inode)->i_extra_isize = new_extra_isize;
- goto out;
- }
+ ifree = ext4_xattr_free_space(base, &min_offs, base, &total_ino);
+ if (ifree >= isize_diff)
+ goto shift;
/*
* Enough free space isn't available in the inode, check if
goto cleanup;
}
base = BHDR(bh);
- first = BFIRST(bh);
end = bh->b_data + bh->b_size;
min_offs = end - base;
- free = ext4_xattr_free_space(first, &min_offs, base, NULL);
- if (free < isize_diff) {
+ bfree = ext4_xattr_free_space(BFIRST(bh), &min_offs, base,
+ NULL);
+ if (bfree + ifree < isize_diff) {
if (!tried_min_extra_isize && s_min_extra_isize) {
tried_min_extra_isize++;
new_extra_isize = s_min_extra_isize;
brelse(bh);
goto retry;
}
- error = -1;
+ error = -ENOSPC;
goto cleanup;
}
} else {
- free = inode->i_sb->s_blocksize;
+ bfree = inode->i_sb->s_blocksize;
}
- while (isize_diff > 0) {
- size_t offs, size, entry_size;
- struct ext4_xattr_entry *small_entry = NULL;
- struct ext4_xattr_info i = {
- .value = NULL,
- .value_len = 0,
- };
- unsigned int total_size; /* EA entry size + value size */
- unsigned int shift_bytes; /* No. of bytes to shift EAs by? */
- unsigned int min_total_size = ~0U;
-
- is = kzalloc(sizeof(struct ext4_xattr_ibody_find), GFP_NOFS);
- bs = kzalloc(sizeof(struct ext4_xattr_block_find), GFP_NOFS);
- if (!is || !bs) {
- error = -ENOMEM;
- goto cleanup;
- }
-
- is->s.not_found = -ENODATA;
- bs->s.not_found = -ENODATA;
- is->iloc.bh = NULL;
- bs->bh = NULL;
-
- last = IFIRST(header);
- /* Find the entry best suited to be pushed into EA block */
- entry = NULL;
- for (; !IS_LAST_ENTRY(last); last = EXT4_XATTR_NEXT(last)) {
- total_size =
- EXT4_XATTR_SIZE(le32_to_cpu(last->e_value_size)) +
- EXT4_XATTR_LEN(last->e_name_len);
- if (total_size <= free && total_size < min_total_size) {
- if (total_size < isize_diff) {
- small_entry = last;
- } else {
- entry = last;
- min_total_size = 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;
- kfree(is); is = NULL;
- kfree(bs); bs = NULL;
- brelse(bh);
- goto retry;
- }
- error = -1;
- goto cleanup;
- }
- }
- offs = le16_to_cpu(entry->e_value_offs);
- size = le32_to_cpu(entry->e_value_size);
- entry_size = EXT4_XATTR_LEN(entry->e_name_len);
- i.name_index = entry->e_name_index,
- buffer = kmalloc(EXT4_XATTR_SIZE(size), GFP_NOFS);
- b_entry_name = kmalloc(entry->e_name_len + 1, GFP_NOFS);
- if (!buffer || !b_entry_name) {
- error = -ENOMEM;
- goto cleanup;
+ error = ext4_xattr_make_inode_space(handle, inode, raw_inode,
+ isize_diff, ifree, bfree,
+ &total_ino);
+ if (error) {
+ if (error == -ENOSPC && !tried_min_extra_isize &&
+ s_min_extra_isize) {
+ tried_min_extra_isize++;
+ new_extra_isize = s_min_extra_isize;
+ brelse(bh);
+ goto retry;
}
- /* Save the entry name and the entry value */
- memcpy(buffer, (void *)IFIRST(header) + offs,
- EXT4_XATTR_SIZE(size));
- memcpy(b_entry_name, entry->e_name, entry->e_name_len);
- b_entry_name[entry->e_name_len] = '\0';
- i.name = b_entry_name;
-
- error = ext4_get_inode_loc(inode, &is->iloc);
- if (error)
- goto cleanup;
-
- error = ext4_xattr_ibody_find(inode, &i, is);
- if (error)
- goto cleanup;
-
- /* Remove the chosen entry from the inode */
- error = ext4_xattr_ibody_set(handle, inode, &i, is);
- if (error)
- goto cleanup;
- total_ino -= entry_size;
-
- entry = IFIRST(header);
- if (entry_size + EXT4_XATTR_SIZE(size) >= isize_diff)
- shift_bytes = isize_diff;
- else
- shift_bytes = entry_size + EXT4_XATTR_SIZE(size);
- /* Adjust the offsets and shift the remaining entries ahead */
- ext4_xattr_shift_entries(entry, -shift_bytes,
- (void *)raw_inode + EXT4_GOOD_OLD_INODE_SIZE +
- EXT4_I(inode)->i_extra_isize + shift_bytes,
- (void *)header, total_ino, inode->i_sb->s_blocksize);
-
- isize_diff -= shift_bytes;
- EXT4_I(inode)->i_extra_isize += shift_bytes;
- header = IHDR(inode, raw_inode);
-
- i.name = b_entry_name;
- i.value = buffer;
- i.value_len = size;
- error = ext4_xattr_block_find(inode, &i, bs);
- if (error)
- goto cleanup;
-
- /* Add entry which was removed from the inode into the block */
- error = ext4_xattr_block_set(handle, inode, &i, bs);
- if (error)
- goto cleanup;
- kfree(b_entry_name);
- kfree(buffer);
- b_entry_name = NULL;
- buffer = NULL;
- brelse(is->iloc.bh);
- kfree(is);
- kfree(bs);
+ goto cleanup;
}
+shift:
+ /* Adjust the offsets and shift the remaining entries ahead */
+ ext4_xattr_shift_entries(IFIRST(header), EXT4_I(inode)->i_extra_isize
+ - new_extra_isize, (void *)raw_inode +
+ EXT4_GOOD_OLD_INODE_SIZE + new_extra_isize,
+ (void *)header, total_ino);
+ EXT4_I(inode)->i_extra_isize = new_extra_isize;
brelse(bh);
out:
ext4_clear_inode_state(inode, EXT4_STATE_NO_EXPAND);
return 0;
cleanup:
- kfree(b_entry_name);
- kfree(buffer);
- if (is)
- brelse(is->iloc.bh);
- kfree(is);
- kfree(bs);
brelse(bh);
/*
* We deliberately leave EXT4_STATE_NO_EXPAND set here since inode
*name++;
}
- if (entry->e_value_block == 0 && entry->e_value_size != 0) {
+ if (entry->e_value_size != 0) {
__le32 *value = (__le32 *)((char *)header +
le16_to_cpu(entry->e_value_offs));
for (n = (le32_to_cpu(entry->e_value_size) +
projects / cascardo / linux.git / blobdiff