VisionFive2 Linux kernel

StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)

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author: Michal Hocko <mhocko@suse.com> 2017-05-03 14:53:26 -0700 committer: Linus Torvalds <torvalds@linux-foundation.org> 2017-05-03 15:52:09 -0700 commit: eb52da3f48f5b1ddceb7e8d4725b6c88204aa2c4 parent: 81378da64de6d33d0c200885f1de431c9a3e5ccd
Commit Summary:
jbd2: make the whole kjournald2 kthread NOFS safe
Diffstat:
1 file 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>
@@ -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.
 	 */