From ea17481fb48888fa11f412766bde36be9171247e Mon Sep 17 00:00:00 2001 From: Song Liu Date: Thu, 9 Mar 2017 21:23:39 -0800 Subject: md/r5cache: generate R5LOG_PAYLOAD_FLUSH In r5c_finish_stripe_write_out(), R5LOG_PAYLOAD_FLUSH is append to log->current_io. Appending R5LOG_PAYLOAD_FLUSH in quiesce needs extra writes to journal. To simplify the logic, we just skip R5LOG_PAYLOAD_FLUSH in quiesce. Even R5LOG_PAYLOAD_FLUSH supports multiple stripes per payload. However, current implementation is one stripe per R5LOG_PAYLOAD_FLUSH, which is simpler. Signed-off-by: Song Liu Signed-off-by: Shaohua Li --- drivers/md/raid5-cache.c | 45 ++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 42 insertions(+), 3 deletions(-) (limited to 'drivers/md/raid5-cache.c') diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c index f85ab2744bfb..64493132470b 100644 --- a/drivers/md/raid5-cache.c +++ b/drivers/md/raid5-cache.c @@ -593,7 +593,7 @@ 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); - if (log->need_cache_flush) + if (log->need_cache_flush && !list_empty(&io->stripe_list)) r5l_move_to_end_ios(log); else r5l_log_run_stripes(log); @@ -621,9 +621,11 @@ static void r5l_log_endio(struct bio *bio) bio_endio(bi); atomic_dec(&io->pending_stripe); } - if (atomic_read(&io->pending_stripe) == 0) - __r5l_stripe_write_finished(io); } + + /* finish flush only io_unit and PAYLOAD_FLUSH only io_unit */ + if (atomic_read(&io->pending_stripe) == 0) + __r5l_stripe_write_finished(io); } static void r5l_do_submit_io(struct r5l_log *log, struct r5l_io_unit *io) @@ -845,6 +847,41 @@ static void r5l_append_payload_page(struct r5l_log *log, struct page *page) r5_reserve_log_entry(log, io); } +static void r5l_append_flush_payload(struct r5l_log *log, sector_t sect) +{ + struct mddev *mddev = log->rdev->mddev; + struct r5conf *conf = mddev->private; + struct r5l_io_unit *io; + struct r5l_payload_flush *payload; + int meta_size; + + /* + * payload_flush requires extra writes to the journal. + * To avoid handling the extra IO in quiesce, just skip + * flush_payload + */ + if (conf->quiesce) + return; + + mutex_lock(&log->io_mutex); + meta_size = sizeof(struct r5l_payload_flush) + sizeof(__le64); + + if (r5l_get_meta(log, meta_size)) { + mutex_unlock(&log->io_mutex); + return; + } + + /* current implementation is one stripe per flush payload */ + io = log->current_io; + payload = page_address(io->meta_page) + io->meta_offset; + payload->header.type = cpu_to_le16(R5LOG_PAYLOAD_FLUSH); + payload->header.flags = cpu_to_le16(0); + payload->size = cpu_to_le32(sizeof(__le64)); + payload->flush_stripes[0] = cpu_to_le64(sect); + io->meta_offset += meta_size; + mutex_unlock(&log->io_mutex); +} + static int r5l_log_stripe(struct r5l_log *log, struct stripe_head *sh, int data_pages, int parity_pages) { @@ -2784,6 +2821,8 @@ void r5c_finish_stripe_write_out(struct r5conf *conf, atomic_dec(&conf->r5c_flushing_full_stripes); atomic_dec(&conf->r5c_cached_full_stripes); } + + r5l_append_flush_payload(log, sh->sector); } int r5c_cache_data(struct r5l_log *log, struct stripe_head *sh) -- cgit v1.2.3-58-ga151