diff options
Diffstat (limited to 'drivers/md/bcache/super.c')
| -rw-r--r-- | drivers/md/bcache/super.c | 109 |
1 files changed, 67 insertions, 42 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index 3dea06b41d43..a31e55bcc4e5 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -37,24 +37,6 @@ static const char invalid_uuid[] = { 0xc8, 0x50, 0xfc, 0x5e, 0xcb, 0x16, 0xcd, 0x99 }; -/* Default is -1; we skip past it for struct cached_dev's cache mode */ -const char * const bch_cache_modes[] = { - "default", - "writethrough", - "writeback", - "writearound", - "none", - NULL -}; - -/* Default is -1; we skip past it for stop_when_cache_set_failed */ -const char * const bch_stop_on_failure_modes[] = { - "default", - "auto", - "always", - NULL -}; - static struct kobject *bcache_kobj; struct mutex bch_register_lock; LIST_HEAD(bch_cache_sets); @@ -654,6 +636,11 @@ static int ioctl_dev(struct block_device *b, fmode_t mode, unsigned int cmd, unsigned long arg) { struct bcache_device *d = b->bd_disk->private_data; + struct cached_dev *dc = container_of(d, struct cached_dev, disk); + + if (dc->io_disable) + return -EIO; + return d->ioctl(d, mode, cmd, arg); } @@ -766,8 +753,7 @@ static void bcache_device_free(struct bcache_device *d) put_disk(d->disk); } - if (d->bio_split) - bioset_free(d->bio_split); + bioset_exit(&d->bio_split); kvfree(d->full_dirty_stripes); kvfree(d->stripe_sectors_dirty); @@ -809,9 +795,8 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, if (idx < 0) return idx; - if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio), - BIOSET_NEED_BVECS | - BIOSET_NEED_RESCUER)) || + if (bioset_init(&d->bio_split, 4, offsetof(struct bbio, bio), + BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER) || !(d->disk = alloc_disk(BCACHE_MINORS))) { ida_simple_remove(&bcache_device_idx, idx); return -ENOMEM; @@ -864,6 +849,44 @@ static void calc_cached_dev_sectors(struct cache_set *c) c->cached_dev_sectors = sectors; } +#define BACKING_DEV_OFFLINE_TIMEOUT 5 +static int cached_dev_status_update(void *arg) +{ + struct cached_dev *dc = arg; + struct request_queue *q; + + /* + * If this delayed worker is stopping outside, directly quit here. + * dc->io_disable might be set via sysfs interface, so check it + * here too. + */ + while (!kthread_should_stop() && !dc->io_disable) { + q = bdev_get_queue(dc->bdev); + if (blk_queue_dying(q)) + dc->offline_seconds++; + else + dc->offline_seconds = 0; + + if (dc->offline_seconds >= BACKING_DEV_OFFLINE_TIMEOUT) { + pr_err("%s: device offline for %d seconds", + dc->backing_dev_name, + BACKING_DEV_OFFLINE_TIMEOUT); + pr_err("%s: disable I/O request due to backing " + "device offline", dc->disk.name); + dc->io_disable = true; + /* let others know earlier that io_disable is true */ + smp_mb(); + bcache_device_stop(&dc->disk); + break; + } + schedule_timeout_interruptible(HZ); + } + + wait_for_kthread_stop(); + return 0; +} + + void bch_cached_dev_run(struct cached_dev *dc) { struct bcache_device *d = &dc->disk; @@ -906,6 +929,14 @@ void bch_cached_dev_run(struct cached_dev *dc) if (sysfs_create_link(&d->kobj, &disk_to_dev(d->disk)->kobj, "dev") || sysfs_create_link(&disk_to_dev(d->disk)->kobj, &d->kobj, "bcache")) pr_debug("error creating sysfs link"); + + dc->status_update_thread = kthread_run(cached_dev_status_update, + dc, "bcache_status_update"); + if (IS_ERR(dc->status_update_thread)) { + pr_warn("failed to create bcache_status_update kthread, " + "continue to run without monitoring backing " + "device status"); + } } /* @@ -1139,6 +1170,8 @@ static void cached_dev_free(struct closure *cl) kthread_stop(dc->writeback_thread); if (dc->writeback_write_wq) destroy_workqueue(dc->writeback_write_wq); + if (!IS_ERR_OR_NULL(dc->status_update_thread)) + kthread_stop(dc->status_update_thread); if (atomic_read(&dc->running)) bd_unlink_disk_holder(dc->bdev, dc->disk.disk); @@ -1465,14 +1498,10 @@ static void cache_set_free(struct closure *cl) if (c->moving_gc_wq) destroy_workqueue(c->moving_gc_wq); - if (c->bio_split) - bioset_free(c->bio_split); - if (c->fill_iter) - mempool_destroy(c->fill_iter); - if (c->bio_meta) - mempool_destroy(c->bio_meta); - if (c->search) - mempool_destroy(c->search); + bioset_exit(&c->bio_split); + mempool_exit(&c->fill_iter); + mempool_exit(&c->bio_meta); + mempool_exit(&c->search); kfree(c->devices); mutex_lock(&bch_register_lock); @@ -1683,21 +1712,17 @@ struct cache_set *bch_cache_set_alloc(struct cache_sb *sb) INIT_LIST_HEAD(&c->btree_cache_freed); INIT_LIST_HEAD(&c->data_buckets); - c->search = mempool_create_slab_pool(32, bch_search_cache); - if (!c->search) - goto err; - iter_size = (sb->bucket_size / sb->block_size + 1) * sizeof(struct btree_iter_set); if (!(c->devices = kzalloc(c->nr_uuids * sizeof(void *), GFP_KERNEL)) || - !(c->bio_meta = mempool_create_kmalloc_pool(2, - sizeof(struct bbio) + sizeof(struct bio_vec) * - bucket_pages(c))) || - !(c->fill_iter = mempool_create_kmalloc_pool(1, iter_size)) || - !(c->bio_split = bioset_create(4, offsetof(struct bbio, bio), - BIOSET_NEED_BVECS | - BIOSET_NEED_RESCUER)) || + mempool_init_slab_pool(&c->search, 32, bch_search_cache) || + mempool_init_kmalloc_pool(&c->bio_meta, 2, + sizeof(struct bbio) + sizeof(struct bio_vec) * + bucket_pages(c)) || + mempool_init_kmalloc_pool(&c->fill_iter, 1, iter_size) || + bioset_init(&c->bio_split, 4, offsetof(struct bbio, bio), + BIOSET_NEED_BVECS|BIOSET_NEED_RESCUER) || !(c->uuids = alloc_bucket_pages(GFP_KERNEL, c)) || !(c->moving_gc_wq = alloc_workqueue("bcache_gc", WQ_MEM_RECLAIM, 0)) || |