Commit 6a7fd522 authored Jul 04, 2016 by Vegard Nossum Committed by Theodore Ts'o Jul 04, 2016

ext4: don't call ext4_should_journal_data() on the journal inode



If ext4_fill_super() fails early, it's possible for ext4_evict_inode()
to call ext4_should_journal_data() before superblock options and flags
are fully set up.  In that case, the iput() on the journal inode can
end up causing a BUG().

Work around this problem by reordering the tests so we only call
ext4_should_journal_data() after we know it's not the journal inode.

Fixes: 2d859db3 ("ext4: fix data corruption in inodes with journalled data")
Fixes: 2b405bfa ("ext4: fix data=journal fast mount/umount hang")
Cc: Jan Kara <jack@suse.cz>
Cc: stable@vger.kernel.org
Signed-off-by: Vegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

parent 4743f839

fs/ext4/inode.c

+3 −3

Original line number	Diff line number	Diff line
		@@ -211,9 +211,9 @@ void ext4_evict_inode(struct inode *inode)
		* Note that directories do not have this problem because they
		* don't use page cache.
		*/
		if (ext4_should_journal_data(inode) &&
		(S_ISLNK(inode->i_mode) \|\| S_ISREG(inode->i_mode)) &&
		inode->i_ino != EXT4_JOURNAL_INO) {
		if (inode->i_ino != EXT4_JOURNAL_INO &&
		ext4_should_journal_data(inode) &&
		(S_ISLNK(inode->i_mode) \|\| S_ISREG(inode->i_mode))) {
		journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
		tid_t commit_tid = EXT4_I(inode)->i_datasync_tid;

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