diff options
| -rw-r--r-- | drivers/md/raid5-cache.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c index a81db0a8466a..a7ee7ec89f4f 100644 --- a/drivers/md/raid5-cache.c +++ b/drivers/md/raid5-cache.c @@ -83,6 +83,8 @@ struct r5l_log { struct list_head no_space_stripes; /* pending stripes, log has no space */ spinlock_t no_space_stripes_lock; + + bool need_cache_flush; }; /* @@ -206,6 +208,22 @@ static void r5l_io_run_stripes(struct r5l_io_unit *io) } /* XXX: totally ignores I/O errors */ +static void r5l_log_run_stripes(struct r5l_log *log) +{ + struct r5l_io_unit *io, *next; + + assert_spin_locked(&log->io_list_lock); + + list_for_each_entry_safe(io, next, &log->running_ios, log_sibling) { + /* don't change list order */ + if (io->state < IO_UNIT_IO_END) + break; + + list_move_tail(&io->log_sibling, &log->finished_ios); + r5l_io_run_stripes(io); + } +} + static void r5l_log_endio(struct bio *bio) { struct r5l_io_unit *io = bio->bi_private; @@ -219,11 +237,15 @@ static void r5l_log_endio(struct bio *bio) spin_lock_irqsave(&log->io_list_lock, flags); __r5l_set_io_unit_state(io, IO_UNIT_IO_END); - r5l_move_io_unit_list(&log->running_ios, &log->io_end_ios, - IO_UNIT_IO_END); + if (log->need_cache_flush) + r5l_move_io_unit_list(&log->running_ios, &log->io_end_ios, + IO_UNIT_IO_END); + else + r5l_log_run_stripes(log); spin_unlock_irqrestore(&log->io_list_lock, flags); - md_wakeup_thread(log->rdev->mddev->thread); + if (log->need_cache_flush) + md_wakeup_thread(log->rdev->mddev->thread); } static void r5l_submit_current_io(struct r5l_log *log) @@ -620,7 +642,8 @@ static void r5l_log_flush_endio(struct bio *bio) void r5l_flush_stripe_to_raid(struct r5l_log *log) { bool do_flush; - if (!log) + + if (!log || !log->need_cache_flush) return; spin_lock_irq(&log->io_list_lock); @@ -1065,6 +1088,8 @@ int r5l_init_log(struct r5conf *conf, struct md_rdev *rdev) return -ENOMEM; log->rdev = rdev; + log->need_cache_flush = (rdev->bdev->bd_disk->queue->flush_flags != 0); + log->uuid_checksum = crc32c_le(~0, rdev->mddev->uuid, sizeof(rdev->mddev->uuid)); |