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authorMichal Hocko <mhocko@suse.com>2017-05-04 00:53:26 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-04 01:52:09 +0300
commiteb52da3f48f5b1ddceb7e8d4725b6c88204aa2c4 (patch)
tree1be347a43a1b078178521f0e36f5e45d6c565608 /fs
parent81378da64de6d33d0c200885f1de431c9a3e5ccd (diff)
downloadlinux-eb52da3f48f5b1ddceb7e8d4725b6c88204aa2c4.tar.xz
jbd2: make the whole kjournald2 kthread NOFS safe
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/jbd2/journal.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 5adc2fb62b0f..c43fe83ee708 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -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>
@@ -206,6 +207,14 @@ static int kjournald2(void *arg)
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.
*/
write_lock(&journal->j_state_lock);