linux-stable/fs/jbd2
Tahsin Erdogan b4709067ac jbd2: preserve original nofs flag during journal restart
When a transaction starts, start_this_handle() saves current
PF_MEMALLOC_NOFS value so that it can be restored at journal stop time.
Journal restart is a special case that calls start_this_handle() without
stopping the transaction. start_this_handle() isn't aware that the
original value is already stored so it overwrites it with current value.

For instance, a call sequence like below leaves PF_MEMALLOC_NOFS flag set
at the end:

  jbd2_journal_start()
  jbd2__journal_restart()
  jbd2_journal_stop()

Make jbd2__journal_restart() restore the original value before calling
start_this_handle().

Fixes: 81378da64d ("jbd2: mark the transaction context with the scope GFP_NOFS context")
Signed-off-by: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
2017-05-21 22:32:23 -04:00
..
checkpoint.c block,fs: use REQ_* flags directly 2016-11-01 09:43:26 -06:00
commit.c fs/jbd2, locking/mutex, sched/wait: Use mutex_lock_io() for journal->j_checkpoint_mutex 2017-01-14 11:30:06 +01:00
journal.c Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-05-10 10:30:46 -07:00
Kconfig jbd2: remove debug dependency on debug_fs and update Kconfig help text 2013-06-12 23:07:51 -04:00
Makefile
recovery.c fs: have ll_rw_block users pass in op and flags separately 2016-06-07 13:41:38 -06:00
revoke.c jbd2: don't leak memory if setting up journal fails 2017-03-15 15:08:48 -04:00
transaction.c jbd2: preserve original nofs flag during journal restart 2017-05-21 22:32:23 -04:00