tree d725aca3ab9555b8ee92f753a797034ff79f580c
parent b7ca1e8ec53259359db5313f923a0a20fa04bdb6
author Jan Kara <jack@suse.cz> 1311685631 -0400
committer Theodore Ts'o <tytso@mit.edu> 1311685631 -0400

ext4: fix data corruption in inodes with journalled data

When journalling data for an inode (either because it is a symlink or
because the filesystem is mounted in data=journal mode), ext4_evict_inode()
can discard unwritten data by calling truncate_inode_pages(). This is
because we don't mark the buffer / page dirty when journalling data but only
add the buffer to the running transaction and thus mm does not know there
are still unwritten data.

Fix the problem by carefully tracking transaction containing inode's data,
committing this transaction, and writing uncheckpointed buffers when inode
should be reaped.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>