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-rw-r--r--drivers/md/bcache/alloc.c3
-rw-r--r--drivers/md/bcache/bcache.h33
-rw-r--r--drivers/md/bcache/btree.c11
-rw-r--r--drivers/md/bcache/io.c2
-rw-r--r--drivers/md/bcache/journal.c4
-rw-r--r--drivers/md/bcache/request.c26
-rw-r--r--drivers/md/bcache/super.c6
-rw-r--r--drivers/md/bcache/sysfs.c18
-rw-r--r--drivers/md/bcache/util.h6
-rw-r--r--drivers/md/bcache/writeback.c37
10 files changed, 116 insertions, 30 deletions
diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c
index 458e1d38577d..004cc3cc6123 100644
--- a/drivers/md/bcache/alloc.c
+++ b/drivers/md/bcache/alloc.c
@@ -287,7 +287,8 @@ do { \
break; \
\
mutex_unlock(&(ca)->set->bucket_lock); \
- if (kthread_should_stop()) { \
+ if (kthread_should_stop() || \
+ test_bit(CACHE_SET_IO_DISABLE, &ca->set->flags)) { \
set_current_state(TASK_RUNNING); \
return 0; \
} \
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index b5ddb848cd31..8a0327581d62 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -188,6 +188,7 @@
#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/workqueue.h>
+#include <linux/kthread.h>
#include "bset.h"
#include "util.h"
@@ -475,10 +476,15 @@ struct gc_stat {
*
* CACHE_SET_RUNNING means all cache devices have been registered and journal
* replay is complete.
+ *
+ * CACHE_SET_IO_DISABLE is set when bcache is stopping the whold cache set, all
+ * external and internal I/O should be denied when this flag is set.
+ *
*/
#define CACHE_SET_UNREGISTERING 0
#define CACHE_SET_STOPPING 1
#define CACHE_SET_RUNNING 2
+#define CACHE_SET_IO_DISABLE 3
struct cache_set {
struct closure cl;
@@ -868,6 +874,33 @@ static inline void wake_up_allocators(struct cache_set *c)
wake_up_process(ca->alloc_thread);
}
+static inline void closure_bio_submit(struct cache_set *c,
+ struct bio *bio,
+ struct closure *cl)
+{
+ closure_get(cl);
+ if (unlikely(test_bit(CACHE_SET_IO_DISABLE, &c->flags))) {
+ bio->bi_status = BLK_STS_IOERR;
+ bio_endio(bio);
+ return;
+ }
+ generic_make_request(bio);
+}
+
+/*
+ * Prevent the kthread exits directly, and make sure when kthread_stop()
+ * is called to stop a kthread, it is still alive. If a kthread might be
+ * stopped by CACHE_SET_IO_DISABLE bit set, wait_for_kthread_stop() is
+ * necessary before the kthread returns.
+ */
+static inline void wait_for_kthread_stop(void)
+{
+ while (!kthread_should_stop()) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ schedule();
+ }
+}
+
/* Forward declarations */
void bch_count_io_errors(struct cache *, blk_status_t, int, const char *);
diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c
index fad9fe8817eb..39cc8a549091 100644
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1744,6 +1744,7 @@ static void bch_btree_gc(struct cache_set *c)
btree_gc_start(c);
+ /* if CACHE_SET_IO_DISABLE set, gc thread should stop too */
do {
ret = btree_root(gc_root, c, &op, &writes, &stats);
closure_sync(&writes);
@@ -1751,7 +1752,7 @@ static void bch_btree_gc(struct cache_set *c)
if (ret && ret != -EAGAIN)
pr_warn("gc failed!");
- } while (ret);
+ } while (ret && !test_bit(CACHE_SET_IO_DISABLE, &c->flags));
bch_btree_gc_finish(c);
wake_up_allocators(c);
@@ -1789,15 +1790,19 @@ static int bch_gc_thread(void *arg)
while (1) {
wait_event_interruptible(c->gc_wait,
- kthread_should_stop() || gc_should_run(c));
+ kthread_should_stop() ||
+ test_bit(CACHE_SET_IO_DISABLE, &c->flags) ||
+ gc_should_run(c));
- if (kthread_should_stop())
+ if (kthread_should_stop() ||
+ test_bit(CACHE_SET_IO_DISABLE, &c->flags))
break;
set_gc_sectors(c);
bch_btree_gc(c);
}
+ wait_for_kthread_stop();
return 0;
}
diff --git a/drivers/md/bcache/io.c b/drivers/md/bcache/io.c
index a783c5a41ff1..8013ecbcdbda 100644
--- a/drivers/md/bcache/io.c
+++ b/drivers/md/bcache/io.c
@@ -38,7 +38,7 @@ void __bch_submit_bbio(struct bio *bio, struct cache_set *c)
bio_set_dev(bio, PTR_CACHE(c, &b->key, 0)->bdev);
b->submit_time_us = local_clock_us();
- closure_bio_submit(bio, bio->bi_private);
+ closure_bio_submit(c, bio, bio->bi_private);
}
void bch_submit_bbio(struct bio *bio, struct cache_set *c,
diff --git a/drivers/md/bcache/journal.c b/drivers/md/bcache/journal.c
index 1b736b860739..c94085f400a4 100644
--- a/drivers/md/bcache/journal.c
+++ b/drivers/md/bcache/journal.c
@@ -62,7 +62,7 @@ reread: left = ca->sb.bucket_size - offset;
bio_set_op_attrs(bio, REQ_OP_READ, 0);
bch_bio_map(bio, data);
- closure_bio_submit(bio, &cl);
+ closure_bio_submit(ca->set, bio, &cl);
closure_sync(&cl);
/* This function could be simpler now since we no longer write
@@ -674,7 +674,7 @@ static void journal_write_unlocked(struct closure *cl)
spin_unlock(&c->journal.lock);
while ((bio = bio_list_pop(&list)))
- closure_bio_submit(bio, cl);
+ closure_bio_submit(c, bio, cl);
continue_at(cl, journal_write_done, NULL);
}
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 6422846b546e..7aca308bee5b 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -747,7 +747,7 @@ static void cached_dev_read_error(struct closure *cl)
/* XXX: invalidate cache */
- closure_bio_submit(bio, cl);
+ closure_bio_submit(s->iop.c, bio, cl);
}
continue_at(cl, cached_dev_cache_miss_done, NULL);
@@ -872,7 +872,7 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s,
s->cache_miss = miss;
s->iop.bio = cache_bio;
bio_get(cache_bio);
- closure_bio_submit(cache_bio, &s->cl);
+ closure_bio_submit(s->iop.c, cache_bio, &s->cl);
return ret;
out_put:
@@ -880,7 +880,7 @@ out_put:
out_submit:
miss->bi_end_io = request_endio;
miss->bi_private = &s->cl;
- closure_bio_submit(miss, &s->cl);
+ closure_bio_submit(s->iop.c, miss, &s->cl);
return ret;
}
@@ -945,7 +945,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
if ((bio_op(bio) != REQ_OP_DISCARD) ||
blk_queue_discard(bdev_get_queue(dc->bdev)))
- closure_bio_submit(bio, cl);
+ closure_bio_submit(s->iop.c, bio, cl);
} else if (s->iop.writeback) {
bch_writeback_add(dc);
s->iop.bio = bio;
@@ -960,12 +960,12 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s)
flush->bi_private = cl;
flush->bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
- closure_bio_submit(flush, cl);
+ closure_bio_submit(s->iop.c, flush, cl);
}
} else {
s->iop.bio = bio_clone_fast(bio, GFP_NOIO, dc->disk.bio_split);
- closure_bio_submit(bio, cl);
+ closure_bio_submit(s->iop.c, bio, cl);
}
closure_call(&s->iop.cl, bch_data_insert, NULL, cl);
@@ -981,7 +981,7 @@ static void cached_dev_nodata(struct closure *cl)
bch_journal_meta(s->iop.c, cl);
/* If it's a flush, we send the flush to the backing device too */
- closure_bio_submit(bio, cl);
+ closure_bio_submit(s->iop.c, bio, cl);
continue_at(cl, cached_dev_bio_complete, NULL);
}
@@ -996,6 +996,12 @@ static blk_qc_t cached_dev_make_request(struct request_queue *q,
struct cached_dev *dc = container_of(d, struct cached_dev, disk);
int rw = bio_data_dir(bio);
+ if (unlikely(d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags))) {
+ bio->bi_status = BLK_STS_IOERR;
+ bio_endio(bio);
+ return BLK_QC_T_NONE;
+ }
+
atomic_set(&dc->backing_idle, 0);
generic_start_io_acct(q, rw, bio_sectors(bio), &d->disk->part0);
@@ -1112,6 +1118,12 @@ static blk_qc_t flash_dev_make_request(struct request_queue *q,
struct bcache_device *d = bio->bi_disk->private_data;
int rw = bio_data_dir(bio);
+ if (unlikely(d->c && test_bit(CACHE_SET_IO_DISABLE, &d->c->flags))) {
+ bio->bi_status = BLK_STS_IOERR;
+ bio_endio(bio);
+ return BLK_QC_T_NONE;
+ }
+
generic_start_io_acct(q, rw, bio_sectors(bio), &d->disk->part0);
s = search_alloc(bio, d);
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index e5be599338c5..dda4ccdd1360 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -521,7 +521,7 @@ static void prio_io(struct cache *ca, uint64_t bucket, int op,
bio_set_op_attrs(bio, op, REQ_SYNC|REQ_META|op_flags);
bch_bio_map(bio, ca->disk_buckets);
- closure_bio_submit(bio, &ca->prio);
+ closure_bio_submit(ca->set, bio, &ca->prio);
closure_sync(cl);
}
@@ -1350,6 +1350,9 @@ bool bch_cache_set_error(struct cache_set *c, const char *fmt, ...)
test_bit(CACHE_SET_STOPPING, &c->flags))
return false;
+ if (test_and_set_bit(CACHE_SET_IO_DISABLE, &c->flags))
+ pr_warn("CACHE_SET_IO_DISABLE already set");
+
/* XXX: we can be called from atomic context
acquire_console_sem();
*/
@@ -1585,6 +1588,7 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
c->congested_read_threshold_us = 2000;
c->congested_write_threshold_us = 20000;
c->error_limit = DEFAULT_IO_ERROR_LIMIT;
+ WARN_ON(test_and_clear_bit(CACHE_SET_IO_DISABLE, &c->flags));
return c;
err:
diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c
index 55673508628f..a3a45de5626d 100644
--- a/drivers/md/bcache/sysfs.c
+++ b/drivers/md/bcache/sysfs.c
@@ -95,6 +95,7 @@ read_attribute(partial_stripes_expensive);
rw_attribute(synchronous);
rw_attribute(journal_delay_ms);
+rw_attribute(io_disable);
rw_attribute(discard);
rw_attribute(running);
rw_attribute(label);
@@ -591,6 +592,8 @@ SHOW(__bch_cache_set)
sysfs_printf(gc_always_rewrite, "%i", c->gc_always_rewrite);
sysfs_printf(btree_shrinker_disabled, "%i", c->shrinker_disabled);
sysfs_printf(copy_gc_enabled, "%i", c->copy_gc_enabled);
+ sysfs_printf(io_disable, "%i",
+ test_bit(CACHE_SET_IO_DISABLE, &c->flags));
if (attr == &sysfs_bset_tree_stats)
return bch_bset_print_stats(c, buf);
@@ -680,6 +683,20 @@ STORE(__bch_cache_set)
if (attr == &sysfs_io_error_halflife)
c->error_decay = strtoul_or_return(buf) / 88;
+ if (attr == &sysfs_io_disable) {
+ int v = strtoul_or_return(buf);
+
+ if (v) {
+ if (test_and_set_bit(CACHE_SET_IO_DISABLE,
+ &c->flags))
+ pr_warn("CACHE_SET_IO_DISABLE already set");
+ } else {
+ if (!test_and_clear_bit(CACHE_SET_IO_DISABLE,
+ &c->flags))
+ pr_warn("CACHE_SET_IO_DISABLE already cleared");
+ }
+ }
+
sysfs_strtoul(journal_delay_ms, c->journal_delay_ms);
sysfs_strtoul(verify, c->verify);
sysfs_strtoul(key_merging_disabled, c->key_merging_disabled);
@@ -765,6 +782,7 @@ static struct attribute *bch_cache_set_internal_files[] = {
&sysfs_gc_always_rewrite,
&sysfs_btree_shrinker_disabled,
&sysfs_copy_gc_enabled,
+ &sysfs_io_disable,
NULL
};
KTYPE(bch_cache_set_internal);
diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h
index a6763db7f061..268024529edd 100644
--- a/drivers/md/bcache/util.h
+++ b/drivers/md/bcache/util.h
@@ -567,12 +567,6 @@ static inline sector_t bdev_sectors(struct block_device *bdev)
return bdev->bd_inode->i_size >> 9;
}
-#define closure_bio_submit(bio, cl) \
-do { \
- closure_get(cl); \
- generic_make_request(bio); \
-} while (0)
-
uint64_t bch_crc64_update(uint64_t, const void *, size_t);
uint64_t bch_crc64(const void *, size_t);
diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c
index 8f98ef1038d3..70092ada68e6 100644
--- a/drivers/md/bcache/writeback.c
+++ b/drivers/md/bcache/writeback.c
@@ -114,6 +114,7 @@ static void update_writeback_rate(struct work_struct *work)
struct cached_dev *dc = container_of(to_delayed_work(work),
struct cached_dev,
writeback_rate_update);
+ struct cache_set *c = dc->disk.c;
/*
* should check BCACHE_DEV_RATE_DW_RUNNING before calling
@@ -123,7 +124,12 @@ static void update_writeback_rate(struct work_struct *work)
/* paired with where BCACHE_DEV_RATE_DW_RUNNING is tested */
smp_mb();
- if (!test_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)) {
+ /*
+ * CACHE_SET_IO_DISABLE might be set via sysfs interface,
+ * check it here too.
+ */
+ if (!test_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags) ||
+ test_bit(CACHE_SET_IO_DISABLE, &c->flags)) {
clear_bit(BCACHE_DEV_RATE_DW_RUNNING, &dc->disk.flags);
/* paired with where BCACHE_DEV_RATE_DW_RUNNING is tested */
smp_mb();
@@ -138,7 +144,12 @@ static void update_writeback_rate(struct work_struct *work)
up_read(&dc->writeback_lock);
- if (test_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags)) {
+ /*
+ * CACHE_SET_IO_DISABLE might be set via sysfs interface,
+ * check it here too.
+ */
+ if (test_bit(BCACHE_DEV_WB_RUNNING, &dc->disk.flags) &&
+ !test_bit(CACHE_SET_IO_DISABLE, &c->flags)) {
schedule_delayed_work(&dc->writeback_rate_update,
dc->writeback_rate_update_seconds * HZ);
}
@@ -278,7 +289,7 @@ static void write_dirty(struct closure *cl)
bio_set_dev(&io->bio, io->dc->bdev);
io->bio.bi_end_io = dirty_endio;
- closure_bio_submit(&io->bio, cl);
+ closure_bio_submit(io->dc->disk.c, &io->bio, cl);
}
atomic_set(&dc->writeback_sequence_next, next_sequence);
@@ -304,7 +315,7 @@ static void read_dirty_submit(struct closure *cl)
{
struct dirty_io *io = container_of(cl, struct dirty_io, cl);
- closure_bio_submit(&io->bio, cl);
+ closure_bio_submit(io->dc->disk.c, &io->bio, cl);
continue_at(cl, write_dirty, io->dc->writeback_write_wq);
}
@@ -330,7 +341,9 @@ static void read_dirty(struct cached_dev *dc)
next = bch_keybuf_next(&dc->writeback_keys);
- while (!kthread_should_stop() && next) {
+ while (!kthread_should_stop() &&
+ !test_bit(CACHE_SET_IO_DISABLE, &dc->disk.c->flags) &&
+ next) {
size = 0;
nk = 0;
@@ -427,7 +440,9 @@ static void read_dirty(struct cached_dev *dc)
}
}
- while (!kthread_should_stop() && delay) {
+ while (!kthread_should_stop() &&
+ !test_bit(CACHE_SET_IO_DISABLE, &dc->disk.c->flags) &&
+ delay) {
schedule_timeout_interruptible(delay);
delay = writeback_delay(dc, 0);
}
@@ -583,11 +598,13 @@ static bool refill_dirty(struct cached_dev *dc)
static int bch_writeback_thread(void *arg)
{
struct cached_dev *dc = arg;
+ struct cache_set *c = dc->disk.c;
bool searched_full_index;
bch_ratelimit_reset(&dc->writeback_rate);
- while (!kthread_should_stop()) {
+ while (!kthread_should_stop() &&
+ !test_bit(CACHE_SET_IO_DISABLE, &c->flags)) {
down_write(&dc->writeback_lock);
set_current_state(TASK_INTERRUPTIBLE);
/*
@@ -601,7 +618,8 @@ static int bch_writeback_thread(void *arg)
(!atomic_read(&dc->has_dirty) || !dc->writeback_running)) {
up_write(&dc->writeback_lock);
- if (kthread_should_stop()) {
+ if (kthread_should_stop() ||
+ test_bit(CACHE_SET_IO_DISABLE, &c->flags)) {
set_current_state(TASK_RUNNING);
break;
}
@@ -637,6 +655,7 @@ static int bch_writeback_thread(void *arg)
while (delay &&
!kthread_should_stop() &&
+ !test_bit(CACHE_SET_IO_DISABLE, &c->flags) &&
!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags))
delay = schedule_timeout_interruptible(delay);
@@ -644,8 +663,8 @@ static int bch_writeback_thread(void *arg)
}
}
- dc->writeback_thread = NULL;
cached_dev_put(dc);
+ wait_for_kthread_stop();
return 0;
}