[PATCH 2/4] md-cluster: Suspend writes in RAID10 if within range
From: Guoqing Jiang <hidden>
Date: 2017-10-24 07:11:51
Subsystem:
software raid (multiple disks) support, the rest · Maintainers:
Song Liu, Yu Kuai, Linus Torvalds
If there is a resync going on, all nodes must suspend writes to the range. This is recorded in suspend_info and suspend_list. If there is an I/O within the ranges of any of the suspend_info, area_resyncing will return 1. Signed-off-by: Guoqing Jiang <redacted> --- drivers/md/raid10.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 61890231972e..5a32f6749d1c 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c@@ -25,6 +25,7 @@ #include <linux/seq_file.h> #include <linux/ratelimit.h> #include <linux/kthread.h> +#include <linux/sched/signal.h> #include <trace/events/block.h> #include "md.h" #include "raid10.h"
@@ -1294,6 +1295,22 @@ static void raid10_write_request(struct mddev *mddev, struct bio *bio, sector_t sectors; int max_sectors; + if ((mddev_is_clustered(mddev) && + md_cluster_ops->area_resyncing(mddev, WRITE, + bio->bi_iter.bi_sector, + bio_end_sector(bio)))) { + DEFINE_WAIT(w); + for (;;) { + prepare_to_wait(&conf->wait_barrier, + &w, TASK_IDLE); + if (!md_cluster_ops->area_resyncing(mddev, WRITE, + bio->bi_iter.bi_sector, bio_end_sector(bio))) + break; + schedule(); + } + finish_wait(&conf->wait_barrier, &w); + } + /* * Register the new request and wait if the reconstruction * thread has put up a bar for new requests.
--
2.10.0