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ext4: let ext4_truncate handle inline data correctly

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Signed-off-by: Robin Dong <sanbai@taobao.com>
Signed-off-by: Tao Ma <boyu.mt@taobao.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Tao Ma 2012-12-10 14:06:02 -05:00 committed by Theodore Ts'o
parent 0d812f77b3
commit aef1c8513c
3 changed files with 107 additions and 0 deletions
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90
fs/ext4/inline.c
View File

@ -1753,3 +1753,93 @@ int ext4_try_to_evict_inline_data(handle_t *handle,
brelse(iloc.bh);
return error;
}
void ext4_inline_data_truncate(struct inode *inode, int *has_inline)
{
handle_t *handle;
int inline_size, value_len, needed_blocks;
size_t i_size;
void *value = NULL;
struct ext4_xattr_ibody_find is = {
.s = { .not_found = -ENODATA, },
};
struct ext4_xattr_info i = {
.name_index = EXT4_XATTR_INDEX_SYSTEM,
.name = EXT4_XATTR_SYSTEM_DATA,
};
needed_blocks = ext4_writepage_trans_blocks(inode);
handle = ext4_journal_start(inode, needed_blocks);
if (IS_ERR(handle))
return;
down_write(&EXT4_I(inode)->xattr_sem);
if (!ext4_has_inline_data(inode)) {
*has_inline = 0;
ext4_journal_stop(handle);
return;
}
if (ext4_orphan_add(handle, inode))
goto out;
if (ext4_get_inode_loc(inode, &is.iloc))
goto out;
down_write(&EXT4_I(inode)->i_data_sem);
i_size = inode->i_size;
inline_size = ext4_get_inline_size(inode);
EXT4_I(inode)->i_disksize = i_size;
if (i_size < inline_size) {
/* Clear the content in the xattr space. */
if (inline_size > EXT4_MIN_INLINE_DATA_SIZE) {
if (ext4_xattr_ibody_find(inode, &i, &is))
goto out_error;
BUG_ON(is.s.not_found);
value_len = le32_to_cpu(is.s.here->e_value_size);
value = kmalloc(value_len, GFP_NOFS);
if (!value)
goto out_error;
if (ext4_xattr_ibody_get(inode, i.name_index, i.name,
value, value_len))
goto out_error;
i.value = value;
i.value_len = i_size > EXT4_MIN_INLINE_DATA_SIZE ?
i_size - EXT4_MIN_INLINE_DATA_SIZE : 0;
if (ext4_xattr_ibody_inline_set(handle, inode, &i, &is))
goto out_error;
}
/* Clear the content within i_blocks. */
if (i_size < EXT4_MIN_INLINE_DATA_SIZE)
memset(ext4_raw_inode(&is.iloc)->i_block + i_size, 0,
EXT4_MIN_INLINE_DATA_SIZE - i_size);
EXT4_I(inode)->i_inline_size = i_size <
EXT4_MIN_INLINE_DATA_SIZE ?
EXT4_MIN_INLINE_DATA_SIZE : i_size;
}
out_error:
up_write(&EXT4_I(inode)->i_data_sem);
out:
brelse(is.iloc.bh);
up_write(&EXT4_I(inode)->xattr_sem);
kfree(value);
if (inode->i_nlink)
ext4_orphan_del(handle, inode);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
ext4_mark_inode_dirty(handle, inode);
if (IS_SYNC(inode))
ext4_handle_sync(handle);
ext4_journal_stop(handle);
return;
}

8
fs/ext4/inode.c
View File

@ -3594,6 +3594,14 @@ void ext4_truncate(struct inode *inode)
if (inode->i_size == 0 && !test_opt(inode->i_sb, NO_AUTO_DA_ALLOC))
ext4_set_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
if (ext4_has_inline_data(inode)) {
int has_inline = 1;
ext4_inline_data_truncate(inode, &has_inline);
if (has_inline)
return;
}
if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
ext4_ext_truncate(inode);
else

9
fs/ext4/xattr.h
View File

@ -190,6 +190,8 @@ extern int ext4_inline_data_fiemap(struct inode *inode,
extern int ext4_try_to_evict_inline_data(handle_t *handle,
struct inode *inode,
int needed);
extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
# else /* CONFIG_EXT4_FS_XATTR */
static inline int
@ -411,6 +413,13 @@ static inline int ext4_inline_data_fiemap(struct inode *inode,
{
return 0;
}
static inline void ext4_inline_data_truncate(struct inode *inode,
int *has_inline)
{
return;
}
# endif /* CONFIG_EXT4_FS_XATTR */
#ifdef CONFIG_EXT4_FS_SECURITY