The patch titled
Subject: jbd2: make the whole kjournald2 kthread NOFS safe
has been removed from the -mm tree. Its filename was
jbd2-make-the-whole-kjournald2-kthread-nofs-safe.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Michal Hocko <mhocko@xxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxxxxxxx: coding-style fixes]
Link: http://lkml.kernel.org/r/20170306131408.9828-8-mhocko@xxxxxxxxxx
Signed-off-by: Michal Hocko <mhocko@xxxxxxxx>
Suggested-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Chris Mason <clm@xxxxxx>
Cc: David Sterba <dsterba@xxxxxxx>
Cc: Brian Foster <bfoster@xxxxxxxxxx>
Cc: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Cc: Nikolay Borisov <nborisov@xxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/jbd2/journal.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN fs/jbd2/journal.c~jbd2-make-the-whole-kjournald2-kthread-nofs-safe fs/jbd2/journal.c
--- a/fs/jbd2/journal.c~jbd2-make-the-whole-kjournald2-kthread-nofs-safe
+++ a/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);
_
Patches currently in -mm which might be from mhocko@xxxxxxxx are
mm-introduce-kvalloc-helpers.patch
mm-vmalloc-properly-track-vmalloc-users.patch
mm-support-__gfp_repeat-in-kvmalloc_node-for-32kb.patch
rhashtable-simplify-a-strange-allocation-pattern.patch
ila-simplify-a-strange-allocation-pattern.patch
xattr-zero-out-memory-copied-to-userspace-in-getxattr.patch
treewide-use-kvalloc-rather-than-opencoded-variants.patch
net-use-kvmalloc-with-__gfp_repeat-rather-than-open-coded-variant.patch
md-use-kvmalloc-rather-than-opencoded-variant.patch
bcache-use-kvmalloc.patch
mm-vmalloc-use-__gfp_highmem-implicitly.patch
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