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| author |   Jan Kara <jack@suse.cz> | 2013-03-20 14:39:05 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2013-03-20 14:49:04 +0100 |
| commit | e643692138cfa33528f054b071ba2583509bb217 (patch) | |
| tree | b63549da76a42fa95968a6c472c0bcb059e172bd | |
| parent | ext2: Fix BUG_ON in evict() on inode deletion (diff) | |
| download | linux-dev-e643692138cfa33528f054b071ba2583509bb217.tar.xz linux-dev-e643692138cfa33528f054b071ba2583509bb217.zip | |
ext3: fix data=journal fast mount/umount hang
In data=journal mode, if we unmount the file system before a
transaction has a chance to complete, when the journal inode is being
evicted, we can end up calling into log_wait_commit() for the
last transaction, after the journalling machinery has been shut down.
That triggers the WARN_ONCE in __log_start_commit().
Arguably we should adjust ext3_should_journal_data() to return FALSE
for the journal inode, but the only place it matters is
ext3_evict_inode(), and so it's to save a bit of CPU time, and to make
the patch much more obviously correct by inspection(tm), we'll fix it
by explicitly not trying to waiting for a journal commit when we are
evicting the journal inode, since it's guaranteed to never succeed in
this case.
This can be easily replicated via:
mount -t ext3 -o data=journal /dev/vdb /vdb ; umount /vdb
This is a port of ext4 fix from Ted Ts'o.
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/ext3/inode.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c index d512c4bc4ad7..d706dbfa6220 100644 --- a/fs/ext3/inode.c +++ b/fs/ext3/inode.c @@ -218,7 +218,8 @@ void ext3_evict_inode (struct inode *inode) */ if (inode->i_nlink && ext3_should_journal_data(inode) && EXT3_SB(inode->i_sb)->s_journal && - (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode))) { + (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode)) && + inode->i_ino != EXT3_JOURNAL_INO) { tid_t commit_tid = atomic_read(&ei->i_datasync_tid); journal_t *journal = EXT3_SB(inode->i_sb)->s_journal; |