This will allow us to stop writeout to portions of the array
while they are resynced by someone else - e.g. another node in
a cluster.
Signed-off-by: NeilBrown <neilb@xxxxxxx>
---
drivers/md/raid1.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index e07ce2e..35b2d86 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -801,6 +801,25 @@ static int make_request(struct request_queue *q, struct bio * bio)
md_write_start(mddev, bio); /* wait on superblock update early */
+ if (bio_data_dir(bio) == WRITE &&
+ bio->bi_sector + bio->bi_size/512 > mddev->suspend_lo &&
+ bio->bi_sector < mddev->suspend_hi) {
+ /* As the suspend_* range is controlled by
+ * userspace, we want an interruptible
+ * wait.
+ */
+ DEFINE_WAIT(w);
+ for (;;) {
+ flush_signals(current);
+ prepare_to_wait(&conf->wait_barrier,
+ &w, TASK_INTERRUPTIBLE);
+ if (bio->bi_sector + bio->bi_size/512 <= mddev->suspend_lo ||
+ bio->bi_sector >= mddev->suspend_hi)
+ break;
+ schedule();
+ }
+ finish_wait(&conf->wait_barrier, &w);
+ }
if (unlikely(!mddev->barriers_work &&
bio_rw_flagged(bio, BIO_RW_BARRIER))) {
if (rw == WRITE)
@@ -2271,6 +2290,9 @@ static void raid1_quiesce(mddev_t *mddev, int state)
conf_t *conf = mddev->private;
switch(state) {
+ case 2: /* wake for suspend */
+ wake_up(&conf->wait_barrier);
+ break;
case 1:
raise_barrier(conf);
break;
--
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