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md: add honouring of suspend_{lo,hi} to raid1. 

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@suse.de>
This commit is contained in:
NeilBrown 2009-12-14 12:49:51 +11:00
parent 729a18663a
commit 6eef4b21ff
1 changed files with 22 additions and 0 deletions
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22
drivers/md/raid1.c
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@ -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;