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| author | Jan Kara <jack@suse.cz> | 2008-07-11 19:27:31 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-07-11 19:27:31 -0400 |
| commit | 9ddfc3dc75b5cc55ff3cfa586e962d252f1db9d3 (patch) | |
| tree | 4932f75d2f303561b0038fb5ea8985345b3ccd6b | |
| parent | cf108bca465dde0c015f32dd453b99457d31c7c7 (diff) | |
| download | linux-3.10-9ddfc3dc75b5cc55ff3cfa586e962d252f1db9d3.tar.gz linux-3.10-9ddfc3dc75b5cc55ff3cfa586e962d252f1db9d3.tar.bz2 linux-3.10-9ddfc3dc75b5cc55ff3cfa586e962d252f1db9d3.zip | |
ext4: Fix lock inversion in ext4_ext_truncate()
We cannot call ext4_orphan_add() from under i_data_sem because that
causes a lock ordering violation between i_data_sem and and the
superblock lock.
Updated with Aneesh's locking order fix
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/ext4/extents.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index b722bce7d66..7844bbb2bac 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2768,6 +2768,9 @@ void ext4_ext_truncate(struct inode *inode) if (inode->i_size & (sb->s_blocksize - 1)) ext4_block_truncate_page(handle, mapping, inode->i_size); + if (ext4_orphan_add(handle, inode)) + goto out_stop; + down_write(&EXT4_I(inode)->i_data_sem); ext4_ext_invalidate_cache(inode); @@ -2778,8 +2781,6 @@ void ext4_ext_truncate(struct inode *inode) * Probably we need not scan at all, * because page truncation is enough. */ - if (ext4_orphan_add(handle, inode)) - goto out_stop; /* we have to know where to truncate from in crash case */ EXT4_I(inode)->i_disksize = inode->i_size; @@ -2796,6 +2797,7 @@ void ext4_ext_truncate(struct inode *inode) handle->h_sync = 1; out_stop: + up_write(&EXT4_I(inode)->i_data_sem); /* * If this was a simple ftruncate() and the file will remain alive, * then we need to clear up the orphan record which we created above. @@ -2806,7 +2808,6 @@ out_stop: if (inode->i_nlink) ext4_orphan_del(handle, inode); - up_write(&EXT4_I(inode)->i_data_sem); inode->i_mtime = inode->i_ctime = ext4_current_time(inode); ext4_mark_inode_dirty(handle, inode); ext4_journal_stop(handle); |