jbd2: make the whole kjournald2 kthread NOFS safe
authorMichal Hocko <mhocko@suse.com>
Wed, 3 May 2017 21:53:26 +0000 (14:53 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 3 May 2017 22:52:09 +0000 (15:52 -0700)
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.

[akpm@linux-foundation.org: coding-style fixes]
Link: http://lkml.kernel.org/r/20170306131408.9828-8-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Chris Mason <clm@fb.com>
Cc: David Sterba <dsterba@suse.cz>
Cc: Brian Foster <bfoster@redhat.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Nikolay Borisov <nborisov@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/jbd2/journal.c

index 5adc2fb62b0fab89899e5d0acba1e8019a73c766..c43fe83ee708fbc079ab692515a878d872b8df9c 100644 (file)
@@ -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.
         */