diff options
Diffstat (limited to 'drivers/md/raid1.c')
| -rw-r--r-- | drivers/md/raid1.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 18aaa7247bba..b6c4e44f9b4b 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1590,16 +1590,19 @@ static void raid1_write_request(struct mddev *mddev, struct bio *bio, continue; if (first_clone) { + unsigned long max_write_behind = + mddev->bitmap_info.max_write_behind; + struct md_bitmap_stats stats; + int err; + /* do behind I/O ? * Not if there are too many, or cannot * allocate memory, or a reader on WriteMostly * is waiting for behind writes to flush */ - if (bitmap && write_behind && - (atomic_read(&bitmap->behind_writes) - < mddev->bitmap_info.max_write_behind) && - !waitqueue_active(&bitmap->behind_wait)) { + err = md_bitmap_get_stats(bitmap, &stats); + if (!err && write_behind && !stats.behind_wait && + stats.behind_writes < max_write_behind) alloc_behind_master_bio(r1_bio, bio); - } md_bitmap_startwrite(bitmap, r1_bio->sector, r1_bio->sectors, test_bit(R1BIO_BehindIO, &r1_bio->state)); |