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Diffstat (limited to 'drivers/md/raid1-10.c')
| -rw-r--r-- | drivers/md/raid1-10.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c index 52469e460dab..c62bcb17c67b 100644 --- a/drivers/md/raid1-10.c +++ b/drivers/md/raid1-10.c @@ -152,3 +152,17 @@ static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio, return true; } + +/* + * current->bio_list will be set under submit_bio() context, in this case bitmap + * io will be added to the list and wait for current io submission to finish, + * while current io submission must wait for bitmap io to be done. In order to + * avoid such deadlock, submit bitmap io asynchronously. + */ +static inline void raid1_prepare_flush_writes(struct bitmap *bitmap) +{ + if (current->bio_list) + md_bitmap_unplug_async(bitmap); + else + md_bitmap_unplug(bitmap); +} |