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| author | Jan Kara <jack@suse.cz> | 2016-08-11 12:38:55 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2016-08-11 12:38:55 -0400 |
| commit | 2e81a4eeedcaa66e35f58b81e0755b87057ce392 (patch) | |
| tree | c51fa9b5eb8a39ec51afcaf836b2a7ad597743cd /fs/ext4/inode.c | |
| parent | 443a8c41cd49de66a3fda45b32b9860ea0292b84 (diff) | |
| download | op-kernel-dev-2e81a4eeedcaa66e35f58b81e0755b87057ce392.zip op-kernel-dev-2e81a4eeedcaa66e35f58b81e0755b87057ce392.tar.gz | |
ext4: avoid deadlock when expanding inode size
When we need to move xattrs into external xattr block, we call
ext4_xattr_block_set() from ext4_expand_extra_isize_ea(). That may end
up calling ext4_mark_inode_dirty() again which will recurse back into
the inode expansion code leading to deadlocks.
Protect from recursion using EXT4_STATE_NO_EXPAND inode flag and move
its management into ext4_expand_extra_isize_ea() since its manipulation
is safe there (due to xattr_sem) from possible races with
ext4_xattr_set_handle() which plays with it as well.
CC: stable@vger.kernel.org # 4.4.x
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 5a6277d..13c95b2 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -5466,8 +5466,6 @@ int ext4_mark_inode_dirty(handle_t *handle, struct inode *inode) sbi->s_want_extra_isize, iloc, handle); if (ret) { - ext4_set_inode_state(inode, - EXT4_STATE_NO_EXPAND); if (mnt_count != le16_to_cpu(sbi->s_es->s_mnt_count)) { ext4_warning(inode->i_sb, |
