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jbd2: make the whole kjournald2 kthread NOFS safe

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kjournald2 is central to the transaction commit processing.  As such any
potential allocation from this kernel thread has to be GFP_NOFS.  Make
sure to mark the whole kernel thread GFP_NOFS by the memalloc_nofs_save.

[[email protected]: coding-style fixes]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Michal Hocko <[email protected]>
Suggested-by: Jan Kara <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Cc: Dave Chinner <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Cc: Chris Mason <[email protected]>
Cc: David Sterba <[email protected]>
Cc: Brian Foster <[email protected]>
Cc: Darrick J. Wong <[email protected]>
Cc: Nikolay Borisov <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michal Hocko 2017-05-03 14:53:26 -07:00 • committed by Linus Torvalds
commit eb52da3f48
1 changed files with 9 additions and 0 deletions
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9
fs/jbd2/journal.c
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@ -43,6 +43,7 @@
#include <linux/backing-dev.h>
#include <linux/bitops.h>
#include <linux/ratelimit.h>
#include <linux/sched/mm.h>
#define CREATE_TRACE_POINTS
#include <trace/events/jbd2.h>
@ -205,6 +206,14 @@ static int kjournald2(void *arg)
journal->j_task = current;
wake_up(&journal->j_wait_done_commit);
/*
* Make sure that no allocations from this kernel thread will ever
* recurse to the fs layer because we are responsible for the
* transaction commit and any fs involvement might get stuck waiting for
* the trasn. commit.
*/
memalloc_nofs_save();
/*
* And now, wait forever for commit wakeup events.
*/