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| author | Miao Xie <miaoxie@huawei.com> | 2017-08-06 00:27:38 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2017-08-06 00:27:38 -0400 |
| commit | 3b10fdc6d8bd048f4fb14af5eda2051ace7b8b16 (patch) | |
| tree | cab4fdbe9b87cda858f93fa1b89519d69a9fd4df /fs | |
| parent | 9699d4f91d9bd2f70dcc37afe3c9f18145ab2dba (diff) | |
| download | linux-3b10fdc6d8bd048f4fb14af5eda2051ace7b8b16.tar.gz linux-3b10fdc6d8bd048f4fb14af5eda2051ace7b8b16.tar.bz2 linux-3b10fdc6d8bd048f4fb14af5eda2051ace7b8b16.zip | |
ext4: fix forgetten xattr lock protection in ext4_expand_extra_isize
We should avoid the contention between the i_extra_isize update and
the inline data insertion, so move the xattr trylock in front of
i_extra_isize update.
Signed-off-by: Miao Xie <miaoxie@huawei.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ext4/inode.c | 18 | ||||
| -rw-r--r-- | fs/ext4/xattr.c | 10 |
2 files changed, 16 insertions, 12 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 56bca45bcdf4..5dabbf276651 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5713,10 +5713,15 @@ static int ext4_expand_extra_isize(struct inode *inode, { 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_write_trylock_xattr(inode, &no_expand) == 0) + return 0; + raw_inode = ext4_raw_inode(&iloc); header = IHDR(inode, raw_inode); @@ -5728,12 +5733,21 @@ static int ext4_expand_extra_isize(struct inode *inode, EXT4_I(inode)->i_extra_isize, 0, new_extra_isize - EXT4_I(inode)->i_extra_isize); EXT4_I(inode)->i_extra_isize = new_extra_isize; + ext4_write_unlock_xattr(inode, &no_expand); return 0; } /* try to expand with EAs present */ - return ext4_expand_extra_isize_ea(inode, new_extra_isize, - raw_inode, handle); + error = ext4_expand_extra_isize_ea(inode, new_extra_isize, + raw_inode, handle); + if (error) { + /* + * Inode size expansion failed; don't try again + */ + no_expand = 1; + } + ext4_write_unlock_xattr(inode, &no_expand); + return error; } /* diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c index 5fa912e5d2a6..862ba3891398 100644 --- a/fs/ext4/xattr.c +++ b/fs/ext4/xattr.c @@ -2645,10 +2645,6 @@ int ext4_expand_extra_isize_ea(struct inode *inode, int new_extra_isize, 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 */ - int no_expand; - - if (ext4_write_trylock_xattr(inode, &no_expand) == 0) - return 0; retry: isize_diff = new_extra_isize - EXT4_I(inode)->i_extra_isize; @@ -2731,16 +2727,10 @@ shift: EXT4_I(inode)->i_extra_isize = new_extra_isize; brelse(bh); out: - ext4_write_unlock_xattr(inode, &no_expand); return 0; cleanup: brelse(bh); - /* - * Inode size expansion failed; don't try again - */ - no_expand = 1; - ext4_write_unlock_xattr(inode, &no_expand); return error; } |