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Subject[PATCH 4.14 36/61] md: move suspend_hi/lo handling into core md code
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: NeilBrown <neilb@suse.com>

commit b3143b9a38d5039bcd1f2d1c94039651bfba8043 upstream.

responding to ->suspend_lo and ->suspend_hi is similar
to responding to ->suspended. It is best to wait in
the common core code without incrementing ->active_io.
This allows mddev_suspend()/mddev_resume() to work while
requests are waiting for suspend_lo/hi to change.
This is will be important after a subsequent patch
which uses mddev_suspend() to synchronize updating for
suspend_lo/hi.

So move the code for testing suspend_lo/hi out of raid1.c
and raid5.c, and place it in md.c

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jack Wang <jinpu.wang@profitbricks.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/md/md.c | 29 +++++++++++++++++++++++------
drivers/md/raid1.c | 14 +++++---------
drivers/md/raid5.c | 22 ----------------------
3 files changed, 28 insertions(+), 37 deletions(-)

--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -266,16 +266,31 @@ static DEFINE_SPINLOCK(all_mddevs_lock);
* call has finished, the bio has been linked into some internal structure
* and so is visible to ->quiesce(), so we don't need the refcount any more.
*/
+static bool is_suspended(struct mddev *mddev, struct bio *bio)
+{
+ if (mddev->suspended)
+ return true;
+ if (bio_data_dir(bio) != WRITE)
+ return false;
+ if (mddev->suspend_lo >= mddev->suspend_hi)
+ return false;
+ if (bio->bi_iter.bi_sector >= mddev->suspend_hi)
+ return false;
+ if (bio_end_sector(bio) < mddev->suspend_lo)
+ return false;
+ return true;
+}
+
void md_handle_request(struct mddev *mddev, struct bio *bio)
{
check_suspended:
rcu_read_lock();
- if (mddev->suspended) {
+ if (is_suspended(mddev, bio)) {
DEFINE_WAIT(__wait);
for (;;) {
prepare_to_wait(&mddev->sb_wait, &__wait,
TASK_UNINTERRUPTIBLE);
- if (!mddev->suspended)
+ if (!is_suspended(mddev, bio))
break;
rcu_read_unlock();
schedule();
@@ -4849,10 +4864,11 @@ suspend_lo_store(struct mddev *mddev, co
goto unlock;
old = mddev->suspend_lo;
mddev->suspend_lo = new;
- if (new >= old)
+ if (new >= old) {
/* Shrinking suspended region */
+ wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 2);
- else {
+ } else {
/* Expanding suspended region - need to wait */
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
@@ -4892,10 +4908,11 @@ suspend_hi_store(struct mddev *mddev, co
goto unlock;
old = mddev->suspend_hi;
mddev->suspend_hi = new;
- if (new <= old)
+ if (new <= old) {
/* Shrinking suspended region */
+ wake_up(&mddev->sb_wait);
mddev->pers->quiesce(mddev, 2);
- else {
+ } else {
/* Expanding suspended region - need to wait */
mddev->pers->quiesce(mddev, 1);
mddev->pers->quiesce(mddev, 0);
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -1298,11 +1298,9 @@ static void raid1_write_request(struct m
*/


- if ((bio_end_sector(bio) > mddev->suspend_lo &&
- bio->bi_iter.bi_sector < mddev->suspend_hi) ||
- (mddev_is_clustered(mddev) &&
+ if (mddev_is_clustered(mddev) &&
md_cluster_ops->area_resyncing(mddev, WRITE,
- bio->bi_iter.bi_sector, bio_end_sector(bio)))) {
+ bio->bi_iter.bi_sector, bio_end_sector(bio))) {

/*
* As the suspend_* range is controlled by userspace, we want
@@ -1313,12 +1311,10 @@ static void raid1_write_request(struct m
sigset_t full, old;
prepare_to_wait(&conf->wait_barrier,
&w, TASK_INTERRUPTIBLE);
- if ((bio_end_sector(bio) <= mddev->suspend_lo ||
- bio->bi_iter.bi_sector >= mddev->suspend_hi) &&
- (!mddev_is_clustered(mddev) ||
- !md_cluster_ops->area_resyncing(mddev, WRITE,
+ if (!mddev_is_clustered(mddev) ||
+ !md_cluster_ops->area_resyncing(mddev, WRITE,
bio->bi_iter.bi_sector,
- bio_end_sector(bio))))
+ bio_end_sector(bio)))
break;
sigfillset(&full);
sigprocmask(SIG_BLOCK, &full, &old);
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -5686,28 +5686,6 @@ static bool raid5_make_request(struct md
goto retry;
}

- if (rw == WRITE &&
- logical_sector >= mddev->suspend_lo &&
- logical_sector < mddev->suspend_hi) {
- raid5_release_stripe(sh);
- /* As the suspend_* range is controlled by
- * userspace, we want an interruptible
- * wait.
- */
- prepare_to_wait(&conf->wait_for_overlap,
- &w, TASK_INTERRUPTIBLE);
- if (logical_sector >= mddev->suspend_lo &&
- logical_sector < mddev->suspend_hi) {
- sigset_t full, old;
- sigfillset(&full);
- sigprocmask(SIG_BLOCK, &full, &old);
- schedule();
- sigprocmask(SIG_SETMASK, &old, NULL);
- do_prepare = true;
- }
- goto retry;
- }
-
if (test_bit(STRIPE_EXPANDING, &sh->state) ||
!add_stripe_bio(sh, bi, dd_idx, rw, previous)) {
/* Stripe is busy expanding or

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