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ext4: restructure ext4_expand_extra_isize 

Current ext4_expand_extra_isize just tries to expand extra isize, if
someone is holding xattr lock or some check fails, it will give up.
So rename its name to ext4_try_to_expand_extra_isize.

Besides that, we clean up unnecessary check and move some relative checks
into it.

Signed-off-by: Miao Xie <miaoxie@huawei.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
This commit is contained in:
Miao Xie 2017-08-06 00:40:01 -04:00 committed by Theodore Ts'o
parent 3b10fdc6d8
commit cf0a5e818f
2 changed files with 36 additions and 40 deletions
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67
fs/ext4/inode.c
View File

@ -5706,21 +5706,35 @@ ext4_reserve_inode_write(handle_t *handle, struct inode *inode,
* Expand an inode by new_extra_isize bytes.
* Returns 0 on success or negative error number on failure.
*/
static int ext4_expand_extra_isize(struct inode *inode,
unsigned int new_extra_isize,
struct ext4_iloc iloc,
handle_t *handle)
static int ext4_try_to_expand_extra_isize(struct inode *inode,
unsigned int new_extra_isize,
struct ext4_iloc iloc,
handle_t *handle)
{
struct ext4_inode *raw_inode;
struct ext4_xattr_ibody_header *header;
int no_expand;
int error;
if (EXT4_I(inode)->i_extra_isize >= new_extra_isize)
return 0;
if (ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND))
return -EOVERFLOW;
/*
* In nojournal mode, we can immediately attempt to expand
* the inode. When journaled, we first need to obtain extra
* buffer credits since we may write into the EA block
* with this same handle. If journal_extend fails, then it will
* only result in a minor loss of functionality for that inode.
* If this is felt to be critical, then e2fsck should be run to
* force a large enough s_min_extra_isize.
*/
if (ext4_handle_valid(handle) &&
jbd2_journal_extend(handle,
EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) != 0)
return -ENOSPC;
if (ext4_write_trylock_xattr(inode, &no_expand) == 0)
return 0;
return -EBUSY;
raw_inode = ext4_raw_inode(&iloc);
@ -5747,6 +5761,7 @@ static int ext4_expand_extra_isize(struct inode *inode,
no_expand = 1;
}
ext4_write_unlock_xattr(inode, &no_expand);
return error;
}
@ -5767,44 +5782,18 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode)
{
struct ext4_iloc iloc;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
static unsigned int mnt_count;
int err, ret;
int err;
might_sleep();
trace_ext4_mark_inode_dirty(inode, _RET_IP_);
err = ext4_reserve_inode_write(handle, inode, &iloc);
if (err)
return err;
if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize &&
!ext4_test_inode_state(inode, EXT4_STATE_NO_EXPAND)) {
/*
* In nojournal mode, we can immediately attempt to expand
* the inode. When journaled, we first need to obtain extra
* buffer credits since we may write into the EA block
* with this same handle. If journal_extend fails, then it will
* only result in a minor loss of functionality for that inode.
* If this is felt to be critical, then e2fsck should be run to
* force a large enough s_min_extra_isize.
*/
if (!ext4_handle_valid(handle) ||
jbd2_journal_extend(handle,
EXT4_DATA_TRANS_BLOCKS(inode->i_sb)) == 0) {
ret = ext4_expand_extra_isize(inode,
sbi->s_want_extra_isize,
iloc, handle);
if (ret) {
if (mnt_count !=
le16_to_cpu(sbi->s_es->s_mnt_count)) {
ext4_warning(inode->i_sb,
"Unable to expand inode %lu. Delete"
" some EAs or run e2fsck.",
inode->i_ino);
mnt_count =
le16_to_cpu(sbi->s_es->s_mnt_count);
}
}
}
}
if (EXT4_I(inode)->i_extra_isize < sbi->s_want_extra_isize)
ext4_try_to_expand_extra_isize(inode, sbi->s_want_extra_isize,
iloc, handle);
return ext4_mark_iloc_dirty(handle, inode, &iloc);
}

9
fs/ext4/xattr.c
View File

@ -2638,12 +2638,14 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize,
{
struct ext4_xattr_ibody_header *header;
struct buffer_head *bh = NULL;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
static unsigned int mnt_count;
size_t min_offs;
size_t ifree, bfree;
int total_ino;
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 s_min_extra_isize = le16_to_cpu(sbi->s_es->s_min_extra_isize);
int isize_diff; /* How much do we need to grow i_extra_isize */
retry:
@ -2731,6 +2733,11 @@ out:
cleanup:
brelse(bh);
if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) {
ext4_warning(inode->i_sb, "Unable to expand inode %lu. Delete some EAs or run e2fsck.",
inode->i_ino);
mnt_count = le16_to_cpu(sbi->s_es->s_mnt_count);
}
return error;
}