/*
* write the buffer to the inline inode.
* If 'create' is set, we don't need to do the extra copy in the xattr
* value since it is already handled by ext4_xattr_ibody_inline_set.
* That saves us one memcpy.
*/
static void ext4_write_inline_data(struct inode *inode, struct ext4_iloc *iloc,
void *buffer, loff_t pos, unsigned int len)
{
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
struct ext4_inode *raw_inode;
int cp_len = 0;
BUG_ON(!EXT4_I(inode)->i_inline_off);
BUG_ON(pos + len > EXT4_I(inode)->i_inline_size);
raw_inode = ext4_raw_inode(iloc);
buffer += pos;
if (pos < EXT4_MIN_INLINE_DATA_SIZE) {
cp_len = pos + len > EXT4_MIN_INLINE_DATA_SIZE ?
EXT4_MIN_INLINE_DATA_SIZE - pos : len;
memcpy((void *)raw_inode->i_block + pos, buffer, cp_len);
len -= cp_len;
buffer += cp_len;
pos += cp_len;
}
if (!len)
return;
pos -= EXT4_MIN_INLINE_DATA_SIZE;
header = IHDR(inode, raw_inode);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
memcpy((void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs) + pos,
buffer, len);
}
/*
* Called during xattr set, and if we can sparse space 'needed',
* just create the extent tree evict the data to the outer block.
*
* We use jbd2 instead of page cache to move data to the 1st block
* so that the whole transaction can be committed as a whole and
* the data isn't lost because of the delayed page cache write.
*/
int ext4_try_to_evict_inline_data(handle_t *handle,
struct inode *inode,
int needed)
{
int error;
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
struct ext4_inode *raw_inode;
struct ext4_iloc iloc;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
return error;
raw_inode = ext4_raw_inode(&iloc);
header = IHDR(inode, raw_inode);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
if (EXT4_XATTR_LEN(entry->e_name_len) +
EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
error = -ENOSPC;
goto out;
}
error = ext4_convert_inline_data_nolock(handle, inode, &iloc);
out:
brelse(iloc.bh);
return error;
}
static int get_max_inline_xattr_value_size(struct inode *inode,
struct ext4_iloc *iloc)
{
struct ext4_xattr_ibody_header *header;
struct ext4_xattr_entry *entry;
struct ext4_inode *raw_inode;
int free, min_offs;
min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
EXT4_GOOD_OLD_INODE_SIZE -
EXT4_I(inode)->i_extra_isize -
sizeof(struct ext4_xattr_ibody_header);
/*
* We need to subtract another sizeof(__u32) since an in-inode xattr
* needs an empty 4 bytes to indicate the gap between the xattr entry
* and the name/value pair.
*/
if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
return EXT4_XATTR_SIZE(min_offs -
EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA)) -
EXT4_XATTR_ROUND - sizeof(__u32));
raw_inode = ext4_raw_inode(iloc);
header = IHDR(inode, raw_inode);
entry = IFIRST(header);
/* Compute min_offs. */
for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
if (!entry->e_value_block && entry->e_value_size) {
size_t offs = le16_to_cpu(entry->e_value_offs);
if (offs < min_offs)
min_offs = offs;
}
}
free = min_offs -
((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
if (EXT4_I(inode)->i_inline_off) {
entry = (struct ext4_xattr_entry *)
((void *)raw_inode + EXT4_I(inode)->i_inline_off);
free += EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size));
goto out;
}
free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA));
if (free > EXT4_XATTR_ROUND)
free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
else
free = 0;
out:
return free;
}
static int get_max_inline_xattr_value_size(struct inode *inode,
struct ext4_iloc *iloc)
{
struct ext4_xattr_ibody_header *header;
struct ext4_xattr_entry *entry;
struct ext4_inode *raw_inode;
int free, min_offs;
if (!ext4_test_inode_state(inode, EXT4_STATE_XATTR))
return EXT4_XATTR_SIZE(EXT4_SB(inode->i_sb)->s_inode_size -
EXT4_GOOD_OLD_INODE_SIZE -
EXT4_I(inode)->i_extra_isize -
sizeof(struct ext4_xattr_ibody_header) -
EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA_NAME)) -
EXT4_XATTR_ROUND - sizeof(__u32));
down_read(&EXT4_I(inode)->xattr_sem);
raw_inode = ext4_raw_inode(iloc);
header = IHDR(inode, raw_inode);
entry = IFIRST(header);
min_offs = EXT4_SB(inode->i_sb)->s_inode_size -
EXT4_GOOD_OLD_INODE_SIZE -
EXT4_I(inode)->i_extra_isize -
sizeof(struct ext4_xattr_ibody_header);
/* Compute min_offs. */
for (; !IS_LAST_ENTRY(entry); entry = EXT4_XATTR_NEXT(entry)) {
if (!entry->e_value_block && entry->e_value_size) {
size_t offs = le16_to_cpu(entry->e_value_offs);
if (offs < min_offs)
min_offs = offs;
}
}
free = min_offs -
((void *)entry - (void *)IFIRST(header)) - sizeof(__u32);
if (EXT4_I(inode)->i_inline_off) {
entry = (struct ext4_xattr_entry *)
((void *)raw_inode + EXT4_I(inode)->i_inline_off);
free += le32_to_cpu(entry->e_value_size);
goto out;
}
free -= EXT4_XATTR_LEN(strlen(EXT4_XATTR_SYSTEM_DATA_NAME));
if (free > EXT4_XATTR_ROUND)
free = EXT4_XATTR_SIZE(free - EXT4_XATTR_ROUND);
else
free = 0;
out:
up_read(&EXT4_I(inode)->xattr_sem);
return free;
}
void* ext4_get_inline_xattr_pos(struct inode *inode, struct ext4_iloc *iloc)
{
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
BUG_ON(!EXT4_I(inode)->i_inline_off);
header = IHDR(inode, ext4_raw_inode(iloc));
entry = (struct ext4_xattr_entry *)((void *)ext4_raw_inode(iloc) +
EXT4_I(inode)->i_inline_off);
return (void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs);
}
static int ext4_read_inline_data(struct inode *inode, void *buffer,
unsigned int len,
struct ext4_iloc *iloc)
{
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
int cp_len = 0;
struct ext4_inode *raw_inode;
if (!len)
return 0;
BUG_ON(len > EXT4_I(inode)->i_inline_size);
cp_len = len < EXT4_MIN_INLINE_DATA_SIZE ?
len : EXT4_MIN_INLINE_DATA_SIZE;
raw_inode = ext4_raw_inode(iloc);
memcpy(buffer, (void *)(raw_inode->i_block), cp_len);
len -= cp_len;
buffer += cp_len;
if (!len)
goto out;
header = IHDR(inode, raw_inode);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
len = min_t(unsigned int, len,
(unsigned int)le32_to_cpu(entry->e_value_size));
memcpy(buffer,
(void *)IFIRST(header) + le16_to_cpu(entry->e_value_offs), len);
cp_len += len;
out:
return cp_len;
}
/*
* Called during xattr set, and if we can sparse space 'needed',
* just create the extent tree evict the data to the outer block.
*
* We use jbd2 instead of page cache to move data to the 1st block
* so that the whole transaction can be committed as a whole and
* the data isn't lost because of the delayed page cache write.
*/
int ext4_try_to_evict_inline_data(handle_t *handle,
struct inode *inode,
int needed)
{
int error;
struct ext4_xattr_entry *entry;
struct ext4_xattr_ibody_header *header;
struct ext4_inode *raw_inode;
struct ext4_iloc iloc;
void *buf = NULL;
struct buffer_head *data_bh = NULL, tmp_bh;
struct ext4_map_blocks map;
error = ext4_get_inode_loc(inode, &iloc);
if (error)
return error;
raw_inode = ext4_raw_inode(&iloc);
header = IHDR(inode, raw_inode);
entry = (struct ext4_xattr_entry *)((void *)raw_inode +
EXT4_I(inode)->i_inline_off);
if (EXT4_XATTR_LEN(entry->e_name_len) +
EXT4_XATTR_SIZE(le32_to_cpu(entry->e_value_size)) < needed) {
error = -ENOSPC;
goto out;
}
buf = kmalloc(ext4_get_inline_size(inode), GFP_NOFS);
if (!buf) {
error = -ENOMEM;
goto out;
}
error = ext4_read_inline_data(inode, buf,
ext4_get_inline_size(inode), &iloc);
if (error < 0)
goto out;
error = ext4_destroy_inline_data_nolock(handle, inode);
if (error)
goto out;
map.m_lblk = 0;
map.m_len = 1;
map.m_flags = 0;
error = ext4_get_blocks(handle, inode, &map, &tmp_bh, EXT4_GET_BLOCKS_CREATE);
if (error < 0)
goto out;
if (!(map.m_flags & EXT4_MAP_MAPPED)) {
error = -EIO;
goto out;
}
data_bh = sb_getblk(inode->i_sb, map.m_pblk);
if (!data_bh) {
error = -EIO;
goto out;
}
lock_buffer(data_bh);
error = ext4_journal_get_create_access(handle, data_bh);
if (error) {
unlock_buffer(data_bh);
error = -EIO;
goto out;
}
memcpy(data_bh->b_data, buf, data_bh->b_size);
set_buffer_uptodate(data_bh);
unlock_buffer(data_bh);
error = ext4_handle_dirty_metadata(handle,
inode, data_bh);
out:
brelse(data_bh);
kfree(buf);
brelse(iloc.bh);
return error;
}
