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authorJens Axboe <axboe@kernel.dk>2022-09-30 07:47:38 -0600
committerJens Axboe <axboe@kernel.dk>2022-09-30 07:47:38 -0600
commit736feaa3a08124020afe6e51f50bae8598c99f55 (patch)
tree2bfb7cb73a389229e69cb48a32098f6108bf2dc5 /drivers/md
parentf76349cf41451c5c42a99f18a9163377e4b364ff (diff)
parent30514bd2dd4e86a3ecfd6a93a3eadf7b9ea164a0 (diff)
Merge branch 'for-6.1/block' into for-6.1/passthrough
* for-6.1/block: (162 commits) sbitmap: fix lockup while swapping block: add rationale for not using blk_mq_plug() when applicable block: adapt blk_mq_plug() to not plug for writes that require a zone lock s390/dasd: use blk_mq_alloc_disk blk-cgroup: don't update the blkg lookup hint in blkg_conf_prep nvmet: don't look at the request_queue in nvmet_bdev_set_limits nvmet: don't look at the request_queue in nvmet_bdev_zone_mgmt_emulate_all blk-mq: use quiesced elevator switch when reinitializing queues block: replace blk_queue_nowait with bdev_nowait nvme: remove nvme_ctrl_init_connect_q nvme-loop: use the tagset alloc/free helpers nvme-loop: store the generic nvme_ctrl in set->driver_data nvme-loop: initialize sqsize later nvme-fc: use the tagset alloc/free helpers nvme-fc: store the generic nvme_ctrl in set->driver_data nvme-fc: keep ctrl->sqsize in sync with opts->queue_size nvme-rdma: use the tagset alloc/free helpers nvme-rdma: store the generic nvme_ctrl in set->driver_data nvme-tcp: use the tagset alloc/free helpers nvme-tcp: store the generic nvme_ctrl in set->driver_data ... Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/bcache.h2
-rw-r--r--drivers/md/bcache/bset.c2
-rw-r--r--drivers/md/bcache/stats.h1
-rw-r--r--drivers/md/bcache/writeback.c78
-rw-r--r--drivers/md/dm-table.c4
-rw-r--r--drivers/md/md.c5
-rw-r--r--drivers/md/raid0.c2
-rw-r--r--drivers/md/raid10.c151
-rw-r--r--drivers/md/raid10.h2
-rw-r--r--drivers/md/raid5-cache.c11
-rw-r--r--drivers/md/raid5.c147
-rw-r--r--drivers/md/raid5.h32
12 files changed, 263 insertions, 174 deletions
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 2acda9cea0f9..aebb7ef10e63 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -107,7 +107,7 @@
*
* BTREE NODES:
*
- * Our unit of allocation is a bucket, and we we can't arbitrarily allocate and
+ * Our unit of allocation is a bucket, and we can't arbitrarily allocate and
* free smaller than a bucket - so, that's how big our btree nodes are.
*
* (If buckets are really big we'll only use part of the bucket for a btree node
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c
index 94d38e8a59b3..2bba4d6aaaa2 100644
--- a/drivers/md/bcache/bset.c
+++ b/drivers/md/bcache/bset.c
@@ -1264,7 +1264,7 @@ static void __btree_sort(struct btree_keys *b, struct btree_iter *iter,
*
* Don't worry event 'out' is allocated from mempool, it can
* still be swapped here. Because state->pool is a page mempool
- * creaated by by mempool_init_page_pool(), which allocates
+ * created by mempool_init_page_pool(), which allocates
* pages by alloc_pages() indeed.
*/
diff --git a/drivers/md/bcache/stats.h b/drivers/md/bcache/stats.h
index ca4f435f7216..bd3afc856d53 100644
--- a/drivers/md/bcache/stats.h
+++ b/drivers/md/bcache/stats.h
@@ -54,7 +54,6 @@ void bch_cache_accounting_destroy(struct cache_accounting *acc);
void bch_mark_cache_accounting(struct cache_set *c, struct bcache_device *d,
bool hit, bool bypass);
-void bch_mark_cache_readahead(struct cache_set *c, struct bcache_device *d);
void bch_mark_cache_miss_collision(struct cache_set *c,
struct bcache_device *d);
void bch_mark_sectors_bypassed(struct cache_set *c,
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 3f0ff3aab6f2..0285b676e983 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -157,6 +157,53 @@ static void __update_writeback_rate(struct cached_dev *dc)
dc->writeback_rate_target = target;
}
+static bool idle_counter_exceeded(struct cache_set *c)
+{
+ int counter, dev_nr;
+
+ /*
+ * If c->idle_counter is overflow (idel for really long time),
+ * reset as 0 and not set maximum rate this time for code
+ * simplicity.
+ */
+ counter = atomic_inc_return(&c->idle_counter);
+ if (counter <= 0) {
+ atomic_set(&c->idle_counter, 0);
+ return false;
+ }
+
+ dev_nr = atomic_read(&c->attached_dev_nr);
+ if (dev_nr == 0)
+ return false;
+
+ /*
+ * c->idle_counter is increased by writeback thread of all
+ * attached backing devices, in order to represent a rough
+ * time period, counter should be divided by dev_nr.
+ * Otherwise the idle time cannot be larger with more backing
+ * device attached.
+ * The following calculation equals to checking
+ * (counter / dev_nr) < (dev_nr * 6)
+ */
+ if (counter < (dev_nr * dev_nr * 6))
+ return false;
+
+ return true;
+}
+
+/*
+ * Idle_counter is increased every time when update_writeback_rate() is
+ * called. If all backing devices attached to the same cache set have
+ * identical dc->writeback_rate_update_seconds values, it is about 6
+ * rounds of update_writeback_rate() on each backing device before
+ * c->at_max_writeback_rate is set to 1, and then max wrteback rate set
+ * to each dc->writeback_rate.rate.
+ * In order to avoid extra locking cost for counting exact dirty cached
+ * devices number, c->attached_dev_nr is used to calculate the idle
+ * throushold. It might be bigger if not all cached device are in write-
+ * back mode, but it still works well with limited extra rounds of
+ * update_writeback_rate().
+ */
static bool set_at_max_writeback_rate(struct cache_set *c,
struct cached_dev *dc)
{
@@ -167,21 +214,8 @@ static bool set_at_max_writeback_rate(struct cache_set *c,
/* Don't set max writeback rate if gc is running */
if (!c->gc_mark_valid)
return false;
- /*
- * Idle_counter is increased everytime when update_writeback_rate() is
- * called. If all backing devices attached to the same cache set have
- * identical dc->writeback_rate_update_seconds values, it is about 6
- * rounds of update_writeback_rate() on each backing device before
- * c->at_max_writeback_rate is set to 1, and then max wrteback rate set
- * to each dc->writeback_rate.rate.
- * In order to avoid extra locking cost for counting exact dirty cached
- * devices number, c->attached_dev_nr is used to calculate the idle
- * throushold. It might be bigger if not all cached device are in write-
- * back mode, but it still works well with limited extra rounds of
- * update_writeback_rate().
- */
- if (atomic_inc_return(&c->idle_counter) <
- atomic_read(&c->attached_dev_nr) * 6)
+
+ if (!idle_counter_exceeded(c))
return false;
if (atomic_read(&c->at_max_writeback_rate) != 1)
@@ -195,13 +229,10 @@ static bool set_at_max_writeback_rate(struct cache_set *c,
dc->writeback_rate_change = 0;
/*
- * Check c->idle_counter and c->at_max_writeback_rate agagain in case
- * new I/O arrives during before set_at_max_writeback_rate() returns.
- * Then the writeback rate is set to 1, and its new value should be
- * decided via __update_writeback_rate().
+ * In case new I/O arrives during before
+ * set_at_max_writeback_rate() returns.
*/
- if ((atomic_read(&c->idle_counter) <
- atomic_read(&c->attached_dev_nr) * 6) ||
+ if (!idle_counter_exceeded(c) ||
!atomic_read(&c->at_max_writeback_rate))
return false;
@@ -801,10 +832,9 @@ static int bch_writeback_thread(void *arg)
}
}
- if (dc->writeback_write_wq) {
- flush_workqueue(dc->writeback_write_wq);
+ if (dc->writeback_write_wq)
destroy_workqueue(dc->writeback_write_wq);
- }
+
cached_dev_put(dc);
wait_for_kthread_stop();
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 332f96b58252..d8034ff0cb24 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c
@@ -1856,9 +1856,7 @@ static bool dm_table_supports_write_zeroes(struct dm_table *t)
static int device_not_nowait_capable(struct dm_target *ti, struct dm_dev *dev,
sector_t start, sector_t len, void *data)
{
- struct request_queue *q = bdev_get_queue(dev->bdev);
-
- return !blk_queue_nowait(q);
+ return !bdev_nowait(dev->bdev);
}
static bool dm_table_supports_nowait(struct dm_table *t)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 729be2c5296c..a467b492d4ad 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5845,7 +5845,7 @@ int md_run(struct mddev *mddev)
}
}
sysfs_notify_dirent_safe(rdev->sysfs_state);
- nowait = nowait && blk_queue_nowait(bdev_get_queue(rdev->bdev));
+ nowait = nowait && bdev_nowait(rdev->bdev);
}
if (!bioset_initialized(&mddev->bio_set)) {
@@ -6982,7 +6982,7 @@ static int hot_add_disk(struct mddev *mddev, dev_t dev)
* If the new disk does not support REQ_NOWAIT,
* disable on the whole MD.
*/
- if (!blk_queue_nowait(bdev_get_queue(rdev->bdev))) {
+ if (!bdev_nowait(rdev->bdev)) {
pr_info("%s: Disabling nowait because %pg does not support nowait\n",
mdname(mddev), rdev->bdev);
blk_queue_flag_clear(QUEUE_FLAG_NOWAIT, mddev->queue);
@@ -8156,7 +8156,6 @@ static void *md_seq_start(struct seq_file *seq, loff_t *pos)
list_for_each(tmp,&all_mddevs)
if (!l--) {
mddev = list_entry(tmp, struct mddev, all_mddevs);
- mddev_get(mddev);
if (!mddev_get(mddev))
continue;
spin_unlock(&all_mddevs_lock);
diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 78addfe4a0c9..857c49399c28 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -47,7 +47,7 @@ static void dump_zones(struct mddev *mddev)
int len = 0;
for (k = 0; k < conf->strip_zone[j].nb_dev; k++)
- len += snprintf(line+len, 200-len, "%s%pg", k?"/":"",
+ len += scnprintf(line+len, 200-len, "%s%pg", k?"/":"",
conf->devlist[j * raid_disks + k]->bdev);
pr_debug("md: zone%d=[%s]\n", j, line);
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 64d6e4cd8a3a..3aa8b6e11d58 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -79,6 +79,21 @@ static void end_reshape(struct r10conf *conf);
#include "raid1-10.c"
+#define NULL_CMD
+#define cmd_before(conf, cmd) \
+ do { \
+ write_sequnlock_irq(&(conf)->resync_lock); \
+ cmd; \
+ } while (0)
+#define cmd_after(conf) write_seqlock_irq(&(conf)->resync_lock)
+
+#define wait_event_barrier_cmd(conf, cond, cmd) \
+ wait_event_cmd((conf)->wait_barrier, cond, cmd_before(conf, cmd), \
+ cmd_after(conf))
+
+#define wait_event_barrier(conf, cond) \
+ wait_event_barrier_cmd(conf, cond, NULL_CMD)
+
/*
* for resync bio, r10bio pointer can be retrieved from the per-bio
* 'struct resync_pages'.
@@ -274,6 +289,12 @@ static void put_buf(struct r10bio *r10_bio)
lower_barrier(conf);
}
+static void wake_up_barrier(struct r10conf *conf)
+{
+ if (wq_has_sleeper(&conf->wait_barrier))
+ wake_up(&conf->wait_barrier);
+}
+
static void reschedule_retry(struct r10bio *r10_bio)
{
unsigned long flags;
@@ -930,78 +951,101 @@ static void flush_pending_writes(struct r10conf *conf)
static void raise_barrier(struct r10conf *conf, int force)
{
+ write_seqlock_irq(&conf->resync_lock);
BUG_ON(force && !conf->barrier);
- spin_lock_irq(&conf->resync_lock);
/* Wait until no block IO is waiting (unless 'force') */
- wait_event_lock_irq(conf->wait_barrier, force || !conf->nr_waiting,
- conf->resync_lock);
+ wait_event_barrier(conf, force || !conf->nr_waiting);
/* block any new IO from starting */
- conf->barrier++;
+ WRITE_ONCE(conf->barrier, conf->barrier + 1);
/* Now wait for all pending IO to complete */
- wait_event_lock_irq(conf->wait_barrier,
- !atomic_read(&conf->nr_pending) && conf->barrier < RESYNC_DEPTH,
- conf->resync_lock);
+ wait_event_barrier(conf, !atomic_read(&conf->nr_pending) &&
+ conf->barrier < RESYNC_DEPTH);
- spin_unlock_irq(&conf->resync_lock);
+ write_sequnlock_irq(&conf->resync_lock);
}
static void lower_barrier(struct r10conf *conf)
{
unsigned long flags;
- spin_lock_irqsave(&conf->resync_lock, flags);
- conf->barrier--;
- spin_unlock_irqrestore(&conf->resync_lock, flags);
+
+ write_seqlock_irqsave(&conf->resync_lock, flags);
+ WRITE_ONCE(conf->barrier, conf->barrier - 1);
+ write_sequnlock_irqrestore(&conf->resync_lock, flags);
wake_up(&conf->wait_barrier);
}
+static bool stop_waiting_barrier(struct r10conf *conf)
+{
+ struct bio_list *bio_list = current->bio_list;
+
+ /* barrier is dropped */
+ if (!conf->barrier)
+ return true;
+
+ /*
+ * If there are already pending requests (preventing the barrier from
+ * rising completely), and the pre-process bio queue isn't empty, then
+ * don't wait, as we need to empty that queue to get the nr_pending
+ * count down.
+ */
+ if (atomic_read(&conf->nr_pending) && bio_list &&
+ (!bio_list_empty(&bio_list[0]) || !bio_list_empty(&bio_list[1])))
+ return true;
+
+ /* move on if recovery thread is blocked by us */
+ if (conf->mddev->thread->tsk == current &&
+ test_bit(MD_RECOVERY_RUNNING, &conf->mddev->recovery) &&
+ conf->nr_queued > 0)
+ return true;
+
+ return false;
+}
+
+static bool wait_barrier_nolock(struct r10conf *conf)
+{
+ unsigned int seq = read_seqbegin(&conf->resync_lock);
+
+ if (READ_ONCE(conf->barrier))
+ return false;
+
+ atomic_inc(&conf->nr_pending);
+ if (!read_seqretry(&conf->resync_lock, seq))
+ return true;
+
+ if (atomic_dec_and_test(&conf->nr_pending))
+ wake_up_barrier(conf);
+
+ return false;
+}
+
static bool wait_barrier(struct r10conf *conf, bool nowait)
{
bool ret = true;
- spin_lock_irq(&conf->resync_lock);
+ if (wait_barrier_nolock(conf))
+ return true;
+
+ write_seqlock_irq(&conf->resync_lock);
if (conf->barrier) {
- struct bio_list *bio_list = current->bio_list;
- conf->nr_waiting++;
- /* Wait for the barrier to drop.
- * However if there are already pending
- * requests (preventing the barrier from
- * rising completely), and the
- * pre-process bio queue isn't empty,
- * then don't wait, as we need to empty
- * that queue to get the nr_pending
- * count down.
- */
/* Return false when nowait flag is set */
if (nowait) {
ret = false;
} else {
+ conf->nr_waiting++;
raid10_log(conf->mddev, "wait barrier");
- wait_event_lock_irq(conf->wait_barrier,
- !conf->barrier ||
- (atomic_read(&conf->nr_pending) &&
- bio_list &&
- (!bio_list_empty(&bio_list[0]) ||
- !bio_list_empty(&bio_list[1]))) ||
- /* move on if recovery thread is
- * blocked by us
- */
- (conf->mddev->thread->tsk == current &&
- test_bit(MD_RECOVERY_RUNNING,
- &conf->mddev->recovery) &&
- conf->nr_queued > 0),
- conf->resync_lock);
+ wait_event_barrier(conf, stop_waiting_barrier(conf));
+ conf->nr_waiting--;
}
- conf->nr_waiting--;
if (!conf->nr_waiting)
wake_up(&conf->wait_barrier);
}
/* Only increment nr_pending when we wait */
if (ret)
atomic_inc(&conf->nr_pending);
- spin_unlock_irq(&conf->resync_lock);
+ write_sequnlock_irq(&conf->resync_lock);
return ret;
}
@@ -1009,7 +1053,7 @@ static void allow_barrier(struct r10conf *conf)
{
if ((atomic_dec_and_test(&conf->nr_pending)) ||
(conf->array_freeze_pending))
- wake_up(&conf->wait_barrier);
+ wake_up_barrier(conf);
}
static void freeze_array(struct r10conf *conf, int extra)
@@ -1026,27 +1070,24 @@ static void freeze_array(struct r10conf *conf, int extra)
* must match the number of pending IOs (nr_pending) before
* we continue.
*/
- spin_lock_irq(&conf->resync_lock);
+ write_seqlock_irq(&conf->resync_lock);
conf->array_freeze_pending++;
- conf->barrier++;
+ WRITE_ONCE(conf->barrier, conf->barrier + 1);
conf->nr_waiting++;
- wait_event_lock_irq_cmd(conf->wait_barrier,
- atomic_read(&conf->nr_pending) == conf->nr_queued+extra,
- conf->resync_lock,
- flush_pending_writes(conf));
-
+ wait_event_barrier_cmd(conf, atomic_read(&conf->nr_pending) ==
+ conf->nr_queued + extra, flush_pending_writes(conf));
conf->array_freeze_pending--;
- spin_unlock_irq(&conf->resync_lock);
+ write_sequnlock_irq(&conf->resync_lock);
}
static void unfreeze_array(struct r10conf *conf)
{
/* reverse the effect of the freeze */
- spin_lock_irq(&conf->resync_lock);
- conf->barrier--;
+ write_seqlock_irq(&conf->resync_lock);
+ WRITE_ONCE(conf->barrier, conf->barrier - 1);
conf->nr_waiting--;
wake_up(&conf->wait_barrier);
- spin_unlock_irq(&conf->resync_lock);
+ write_sequnlock_irq(&conf->resync_lock);
}
static sector_t choose_data_offset(struct r10bio *r10_bio,
@@ -1885,7 +1926,7 @@ static bool raid10_make_request(struct mddev *mddev, struct bio *bio)
__make_request(mddev, bio, sectors);
/* In case raid10d snuck in to freeze_array */
- wake_up(&conf->wait_barrier);
+ wake_up_barrier(conf);
return true;
}
@@ -1980,7 +2021,7 @@ static int enough(struct r10conf *conf, int ignore)
* Otherwise, it must be degraded:
* - recovery is interrupted.
* - &mddev->degraded is bumped.
-
+ *
* @rdev is marked as &Faulty excluding case when array is failed and
* &mddev->fail_last_dev is off.
*/
@@ -4032,7 +4073,7 @@ static struct r10conf *setup_conf(struct mddev *mddev)
INIT_LIST_HEAD(&conf->retry_list);
INIT_LIST_HEAD(&conf->bio_end_io_list);
- spin_lock_init(&conf->resync_lock);
+ seqlock_init(&conf->resync_lock);
init_waitqueue_head(&conf->wait_barrier);
atomic_set(&conf->nr_pending, 0);
@@ -4351,7 +4392,7 @@ static void *raid10_takeover_raid0(struct mddev *mddev, sector_t size, int devs)
rdev->new_raid_disk = rdev->raid_disk * 2;
rdev->sectors = size;
}
- conf->barrier = 1;
+ WRITE_ONCE(conf->barrier, 1);
}
return conf;
diff --git a/drivers/md/raid10.h b/drivers/md/raid10.h
index 5c0804d8bb1f..8c072ce0bc54 100644
--- a/drivers/md/raid10.h
+++ b/drivers/md/raid10.h
@@ -76,7 +76,7 @@ struct r10conf {
/* queue pending writes and submit them on unplug */
struct bio_list pending_bio_list;
- spinlock_t resync_lock;
+ seqlock_t resync_lock;
atomic_t nr_pending;
int nr_waiting;
int nr_queued;
diff --git a/drivers/md/raid5-cache.c b/drivers/md/raid5-cache.c
index f4e1cc1ece43..79c73330020b 100644
--- a/drivers/md/raid5-cache.c
+++ b/drivers/md/raid5-cache.c
@@ -125,7 +125,7 @@ struct r5l_log {
* reclaimed. if it's 0, reclaim spaces
* used by io_units which are in
* IO_UNIT_STRIPE_END state (eg, reclaim
- * dones't wait for specific io_unit
+ * doesn't wait for specific io_unit
* switching to IO_UNIT_STRIPE_END
* state) */
wait_queue_head_t iounit_wait;
@@ -1327,9 +1327,9 @@ static void r5l_write_super_and_discard_space(struct r5l_log *log,
* superblock is updated to new log tail. Updating superblock (either
* directly call md_update_sb() or depend on md thread) must hold
* reconfig mutex. On the other hand, raid5_quiesce is called with
- * reconfig_mutex hold. The first step of raid5_quiesce() is waitting
- * for all IO finish, hence waitting for reclaim thread, while reclaim
- * thread is calling this function and waitting for reconfig mutex. So
+ * reconfig_mutex hold. The first step of raid5_quiesce() is waiting
+ * for all IO finish, hence waiting for reclaim thread, while reclaim
+ * thread is calling this function and waiting for reconfig mutex. So
* there is a deadlock. We workaround this issue with a trylock.
* FIXME: we could miss discard if we can't take reconfig mutex
*/
@@ -1923,7 +1923,8 @@ r5c_recovery_alloc_stripe(
{
struct stripe_head *sh;
- sh = raid5_get_active_stripe(conf, stripe_sect, 0, noblock, 0);
+ sh = raid5_get_active_stripe(conf, NULL, stripe_sect,
+ noblock ? R5_GAS_NOBLOCK : 0);
if (!sh)
return NULL; /* no more stripe available */
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 31a0cbf63384..7b820b81d8c2 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -36,6 +36,7 @@
*/
#include <linux/blkdev.h>
+#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/raid/pq.h>
#include <linux/async_tx.h>
@@ -789,87 +790,80 @@ struct stripe_request_ctx {
*/
static bool is_inactive_blocked(struct r5conf *conf, int hash)
{
- int active = atomic_read(&conf->active_stripes);
-
if (list_empty(conf->inactive_list + hash))
return false;
if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
return true;
- return active < (conf->max_nr_stripes * 3 / 4);
+ return (atomic_read(&conf->active_stripes) <
+ (conf->max_nr_stripes * 3 / 4));
}
-static struct stripe_head *__raid5_get_active_stripe(struct r5conf *conf,
+struct stripe_head *raid5_get_active_stripe(struct r5conf *conf,
struct stripe_request_ctx *ctx, sector_t sector,
- bool previous, bool noblock, bool noquiesce)
+ unsigned int flags)
{
struct stripe_head *sh;
int hash = stripe_hash_locks_hash(conf, sector);
+ int previous = !!(flags & R5_GAS_PREVIOUS);
pr_debug("get_stripe, sector %llu\n", (unsigned long long)sector);
spin_lock_irq(conf->hash_locks + hash);
-retry:
- if (!noquiesce && conf->quiesce) {
- /*
- * Must release the reference to batch_last before waiting,
- * on quiesce, otherwise the batch_last will hold a reference
- * to a stripe and raid5_quiesce() will deadlock waiting for
- * active_stripes to go to zero.
- */
- if (ctx && ctx->batch_last) {
- raid5_release_stripe(ctx->batch_last);
- ctx->batch_last = NULL;
- }
-
- wait_event_lock_irq(conf->wait_for_quiescent, !conf->quiesce,
- *(conf->hash_locks + hash));
- }
+ for (;;) {
+ if (!(flags & R5_GAS_NOQUIESCE) && conf->quiesce) {
+ /*
+ * Must release the reference to batch_last before
+ * waiting, on quiesce, otherwise the batch_last will
+ * hold a reference to a stripe and raid5_quiesce()
+ * will deadlock waiting for active_stripes to go to
+ * zero.
+ */
+ if (ctx && ctx->batch_last) {
+ raid5_release_stripe(ctx->batch_last);
+ ctx->batch_last = NULL;
+ }
- sh = find_get_stripe(conf, sector, conf->generation - previous, hash);
- if (sh)
- goto out;
+ wait_event_lock_irq(conf->wait_for_quiescent,
+ !conf->quiesce,
+ *(conf->hash_locks + hash));
+ }
- if (test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
- goto wait_for_stripe;
+ sh = find_get_stripe(conf, sector, conf->generation - previous,
+ hash);
+ if (sh)
+ break;
- sh = get_free_stripe(conf, hash);
- if (sh) {
- r5c_check_stripe_cache_usage(conf);
- init_stripe(sh, sector, previous);
- atomic_inc(&sh->count);
- goto out;
- }
+ if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state)) {
+ sh = get_free_stripe(conf, hash);
+ if (sh) {
+ r5c_check_stripe_cache_usage(conf);
+ init_stripe(sh, sector, previous);
+ atomic_inc(&sh->count);
+ break;
+ }
- if (!test_bit(R5_DID_ALLOC, &conf->cache_state))
- set_bit(R5_ALLOC_MORE, &conf->cache_state);
+ if (!test_bit(R5_DID_ALLOC, &conf->cache_state))
+ set_bit(R5_ALLOC_MORE, &conf->cache_state);
+ }
-wait_for_stripe:
- if (noblock)
- goto out;
+ if (flags & R5_GAS_NOBLOCK)
+ break;
- set_bit(R5_INACTIVE_BLOCKED, &conf->cache_state);
- r5l_wake_reclaim(conf->log, 0);
- wait_event_lock_irq(conf->wait_for_stripe,
- is_inactive_blocked(conf, hash),
- *(conf->hash_locks + hash));
- clear_bit(R5_INACTIVE_BLOCKED, &conf->cache_state);
- goto retry;
+ set_bit(R5_INACTIVE_BLOCKED, &conf->cache_state);
+ r5l_wake_reclaim(conf->log, 0);
+ wait_event_lock_irq(conf->wait_for_stripe,
+ is_inactive_blocked(conf, hash),
+ *(conf->hash_locks + hash));
+ clear_bit(R5_INACTIVE_BLOCKED, &conf->cache_state);
+ }
-out:
spin_unlock_irq(conf->hash_locks + hash);
return sh;
}
-struct stripe_head *raid5_get_active_stripe(struct r5conf *conf,
- sector_t sector, bool previous, bool noblock, bool noquiesce)
-{
- return __raid5_get_active_stripe(conf, NULL, sector, previous, noblock,
- noquiesce);
-}
-
static bool is_full_stripe_write(struct stripe_head *sh)
{
BUG_ON(sh->overwrite_disks > (sh->disks - sh->raid_conf->max_degraded));
@@ -4047,7 +4041,7 @@ static void handle_stripe_fill(struct stripe_head *sh,
* back cache (prexor with orig_page, and then xor with
* page) in the read path
*/
- if (s->injournal && s->failed) {
+ if (s->to_read && s->injournal && s->failed) {
if (test_bit(STRIPE_R5C_CACHING, &sh->state))
r5c_make_stripe_write_out(sh);
goto out;
@@ -4636,7 +4630,8 @@ static void handle_stripe_expansion(struct r5conf *conf, struct stripe_head *sh)
sector_t bn = raid5_compute_blocknr(sh, i, 1);
sector_t s = raid5_compute_sector(conf, bn, 0,
&dd_idx, NULL);
- sh2 = raid5_get_active_stripe(conf, s, 0, 1, 1);
+ sh2 = raid5_get_active_stripe(conf, NULL, s,
+ R5_GAS_NOBLOCK | R5_GAS_NOQUIESCE);
if (sh2 == NULL)
/* so far only the early blocks of this stripe
* have been requested. When later blocks
@@ -5273,7 +5268,9 @@ static void handle_stripe(struct stripe_head *sh)
/* Finish reconstruct operations initiated by the expansion process */
if (sh->reconstruct_state == reconstruct_state_result) {
struct stripe_head *sh_src
- = raid5_get_active_stripe(conf, sh->sector, 1, 1, 1);
+ = raid5_get_active_stripe(conf, NULL, sh->sector,
+ R5_GAS_PREVIOUS | R5_GAS_NOBLOCK |
+ R5_GAS_NOQUIESCE);
if (sh_src && test_bit(STRIPE_EXPAND_SOURCE, &sh_src->state)) {
/* sh cannot be written until sh_src has been read.
* so arrange for sh to be delayed a little
@@ -5542,7 +5539,6 @@ static int raid5_read_one_chunk(struct mddev *mddev, struct bio *raid_bio)
if (is_badblock(rdev, sector, bio_sectors(raid_bio), &first_bad,
&bad_sectors)) {
- bio_put(raid_bio);
rdev_dec_pending(rdev, mddev);
return 0;
}
@@ -5823,7 +5819,7 @@ static void make_discard_request(struct mddev *mddev, struct bio *bi)
DEFINE_WAIT(w);
int d;
again:
- sh = raid5_get_active_stripe(conf, logical_sector, 0, 0, 0);
+ sh = raid5_get_active_stripe(conf, NULL, logical_sector, 0);
prepare_to_wait(&conf->wait_for_overlap, &w,
TASK_UNINTERRUPTIBLE);
set_bit(R5_Overlap, &sh->dev[sh->pd_idx].flags);
@@ -5978,7 +5974,7 @@ static enum stripe_result make_stripe_request(struct mddev *mddev,
enum stripe_result ret;
struct stripe_head *sh;
sector_t new_sector;
- int previous = 0;
+ int previous = 0, flags = 0;
int seq, dd_idx;
seq = read_seqcount_begin(&conf->gen_lock);
@@ -6012,8 +6008,11 @@ static enum stripe_result make_stripe_request(struct mddev *mddev,
pr_debug("raid456: %s, sector %llu logical %llu\n", __func__,
new_sector, logical_sector);
- sh = __raid5_get_active_stripe(conf, ctx, new_sector, previous,
- (bi->bi_opf & REQ_RAHEAD), 0);
+ if (previous)
+ flags |= R5_GAS_PREVIOUS;
+ if (bi->bi_opf & REQ_RAHEAD)
+ flags |= R5_GAS_NOBLOCK;
+ sh = raid5_get_active_stripe(conf, ctx, new_sector, flags);
if (unlikely(!sh)) {
/* cannot get stripe, just give-up */
bi->bi_status = BLK_STS_IOERR;
@@ -6362,7 +6361,8 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
for (i = 0; i < reshape_sectors; i += RAID5_STRIPE_SECTORS(conf)) {
int j;
int skipped_disk = 0;
- sh = raid5_get_active_stripe(conf, stripe_addr+i, 0, 0, 1);
+ sh = raid5_get_active_stripe(conf, NULL, stripe_addr+i,
+ R5_GAS_NOQUIESCE);
set_bit(STRIPE_EXPANDING, &sh->state);
atomic_inc(&conf->reshape_stripes);
/* If any of this stripe is beyond the end of the old
@@ -6411,7 +6411,8 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
if (last_sector >= mddev->dev_sectors)
last_sector = mddev->dev_sectors - 1;
while (first_sector <= last_sector) {
- sh = raid5_get_active_stripe(conf, first_sector, 1, 0, 1);
+ sh = raid5_get_active_stripe(conf, NULL, first_sector,
+ R5_GAS_PREVIOUS | R5_GAS_NOQUIESCE);
set_bit(STRIPE_EXPAND_SOURCE, &sh->state);
set_bit(STRIPE_HANDLE, &sh->state);
raid5_release_stripe(sh);
@@ -6531,9 +6532,10 @@ static inline sector_t raid5_sync_request(struct mddev *mddev, sector_t sector_n
md_bitmap_cond_end_sync(mddev->bitmap, sector_nr, false);
- sh = raid5_get_active_stripe(conf, sector_nr, 0, 1, 0);
+ sh = raid5_get_active_stripe(conf, NULL, sector_nr,
+ R5_GAS_NOBLOCK);
if (sh == NULL) {
- sh = raid5_get_active_stripe(conf, sector_nr, 0, 0, 0);
+ sh = raid5_get_active_stripe(conf, NULL, sector_nr, 0);
/* make sure we don't swamp the stripe cache if someone else
* is trying to get access
*/
@@ -6596,8 +6598,8 @@ static int retry_aligned_read(struct r5conf *conf, struct bio *raid_bio,
/* already done this stripe */
continue;
- sh = raid5_get_active_stripe(conf, sector, 0, 1, 1);
-
+ sh = raid5_get_active_stripe(conf, NULL, sector,
+ R5_GAS_NOBLOCK | R5_GAS_NOQUIESCE);
if (!sh) {
/* failed to get a stripe - must wait */
conf->retry_read_aligned = raid_bio;
@@ -6781,7 +6783,18 @@ static void raid5d(struct md_thread *thread)
spin_unlock_irq(&conf->device_lock);
md_check_recovery(mddev);
spin_lock_irq(&conf->device_lock);
+
+ /*
+ * Waiting on MD_SB_CHANGE_PENDING below may deadlock
+ * seeing md_check_recovery() is needed to clear
+ * the flag when using mdmon.
+ */
+ continue;
}
+
+ wait_event_lock_irq(mddev->sb_wait,
+ !test_bit(MD_SB_CHANGE_PENDING, &mddev->sb_flags),
+ conf->device_lock);
}
pr_debug("%d stripes handled\n", handled);
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index a5082bed83c8..e873938a6125 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -803,16 +803,24 @@ raid5_get_dev_page(struct stripe_head *sh, int disk_idx)
}
#endif
-extern void md_raid5_kick_device(struct r5conf *conf);
-extern int raid5_set_cache_size(struct mddev *mddev, int size);
-extern sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous);
-extern void raid5_release_stripe(struct stripe_head *sh);
-extern sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
- int previous, int *dd_idx,
- struct stripe_head *sh);
-extern struct stripe_head *
-raid5_get_active_stripe(struct r5conf *conf, sector_t sector,
- bool previous, bool noblock, bool noquiesce);
-extern int raid5_calc_degraded(struct r5conf *conf);
-extern int r5c_journal_mode_set(struct mddev *mddev, int journal_mode);
+void md_raid5_kick_device(struct r5conf *conf);
+int raid5_set_cache_size(struct mddev *mddev, int size);
+sector_t raid5_compute_blocknr(struct stripe_head *sh, int i, int previous);
+void raid5_release_stripe(struct stripe_head *sh);
+sector_t raid5_compute_sector(struct r5conf *conf, sector_t r_sector,
+ int previous, int *dd_idx, struct stripe_head *sh);
+
+struct stripe_request_ctx;
+/* get stripe from previous generation (when reshaping) */
+#define R5_GAS_PREVIOUS (1 << 0)
+/* do not block waiting for a free stripe */
+#define R5_GAS_NOBLOCK (1 << 1)
+/* do not block waiting for quiesce to be released */
+#define R5_GAS_NOQUIESCE (1 << 2)
+struct stripe_head *raid5_get_active_stripe(struct r5conf *conf,
+ struct stripe_request_ctx *ctx, sector_t sector,
+ unsigned int flags);
+
+int raid5_calc_degraded(struct r5conf *conf);
+int r5c_journal_mode_set(struct mddev *mddev, int journal_mode);
#endif