From f59fce847fc8483508b5028c24e2b1e00523dd88 Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Wed, 15 May 2013 00:11:26 -0700 Subject: [PATCH] bcache: Fix error handling in init code This code appears to have rotted... fix various bugs and do some refactoring. Signed-off-by: Kent Overstreet --- drivers/md/bcache/bcache.h | 2 +- drivers/md/bcache/stats.c | 34 ++++---- drivers/md/bcache/super.c | 182 +++++++++++++++++++----------------------- drivers/md/bcache/writeback.c | 2 +- 4 files changed, 99 insertions(+), 121 deletions(-) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index 340146d..d3e15b4 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -1241,7 +1241,7 @@ void bch_cache_set_stop(struct cache_set *); struct cache_set *bch_cache_set_alloc(struct cache_sb *); void bch_btree_cache_free(struct cache_set *); int bch_btree_cache_alloc(struct cache_set *); -void bch_writeback_init_cached_dev(struct cached_dev *); +void bch_cached_dev_writeback_init(struct cached_dev *); void bch_moving_init_cache_set(struct cache_set *); void bch_cache_allocator_exit(struct cache *ca); diff --git a/drivers/md/bcache/stats.c b/drivers/md/bcache/stats.c index 64e6794..b8730e7 100644 --- a/drivers/md/bcache/stats.c +++ b/drivers/md/bcache/stats.c @@ -93,24 +93,6 @@ static struct attribute *bch_stats_files[] = { }; static KTYPE(bch_stats); -static void scale_accounting(unsigned long data); - -void bch_cache_accounting_init(struct cache_accounting *acc, - struct closure *parent) -{ - kobject_init(&acc->total.kobj, &bch_stats_ktype); - kobject_init(&acc->five_minute.kobj, &bch_stats_ktype); - kobject_init(&acc->hour.kobj, &bch_stats_ktype); - kobject_init(&acc->day.kobj, &bch_stats_ktype); - - closure_init(&acc->cl, parent); - init_timer(&acc->timer); - acc->timer.expires = jiffies + accounting_delay; - acc->timer.data = (unsigned long) acc; - acc->timer.function = scale_accounting; - add_timer(&acc->timer); -} - int bch_cache_accounting_add_kobjs(struct cache_accounting *acc, struct kobject *parent) { @@ -244,3 +226,19 @@ void bch_mark_sectors_bypassed(struct search *s, int sectors) atomic_add(sectors, &dc->accounting.collector.sectors_bypassed); atomic_add(sectors, &s->op.c->accounting.collector.sectors_bypassed); } + +void bch_cache_accounting_init(struct cache_accounting *acc, + struct closure *parent) +{ + kobject_init(&acc->total.kobj, &bch_stats_ktype); + kobject_init(&acc->five_minute.kobj, &bch_stats_ktype); + kobject_init(&acc->hour.kobj, &bch_stats_ktype); + kobject_init(&acc->day.kobj, &bch_stats_ktype); + + closure_init(&acc->cl, parent); + init_timer(&acc->timer); + acc->timer.expires = jiffies + accounting_delay; + acc->timer.data = (unsigned long) acc; + acc->timer.function = scale_accounting; + add_timer(&acc->timer); +} diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index b09beb2..f88e2b6 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -731,8 +731,7 @@ static void bcache_device_free(struct bcache_device *d) if (d->c) bcache_device_detach(d); - - if (d->disk) + if (d->disk && d->disk->flags & GENHD_FL_UP) del_gendisk(d->disk); if (d->disk && d->disk->queue) blk_cleanup_queue(d->disk->queue); @@ -755,12 +754,9 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size) if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio))) || !(d->unaligned_bvec = mempool_create_kmalloc_pool(1, sizeof(struct bio_vec) * BIO_MAX_PAGES)) || - bio_split_pool_init(&d->bio_split_hook)) - - return -ENOMEM; - - d->disk = alloc_disk(1); - if (!d->disk) + bio_split_pool_init(&d->bio_split_hook) || + !(d->disk = alloc_disk(1)) || + !(q = blk_alloc_queue(GFP_KERNEL))) return -ENOMEM; snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", bcache_minor); @@ -770,10 +766,6 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size) d->disk->fops = &bcache_ops; d->disk->private_data = d; - q = blk_alloc_queue(GFP_KERNEL); - if (!q) - return -ENOMEM; - blk_queue_make_request(q, NULL); d->disk->queue = q; q->queuedata = d; @@ -998,14 +990,17 @@ static void cached_dev_free(struct closure *cl) mutex_lock(&bch_register_lock); - bd_unlink_disk_holder(dc->bdev, dc->disk.disk); + if (atomic_read(&dc->running)) + bd_unlink_disk_holder(dc->bdev, dc->disk.disk); bcache_device_free(&dc->disk); list_del(&dc->list); mutex_unlock(&bch_register_lock); if (!IS_ERR_OR_NULL(dc->bdev)) { - blk_sync_queue(bdev_get_queue(dc->bdev)); + if (dc->bdev->bd_disk) + blk_sync_queue(bdev_get_queue(dc->bdev)); + blkdev_put(dc->bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); } @@ -1027,73 +1022,67 @@ static void cached_dev_flush(struct closure *cl) static int cached_dev_init(struct cached_dev *dc, unsigned block_size) { - int err; + int ret; struct io *io; - - closure_init(&dc->disk.cl, NULL); - set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq); + struct request_queue *q = bdev_get_queue(dc->bdev); __module_get(THIS_MODULE); INIT_LIST_HEAD(&dc->list); + closure_init(&dc->disk.cl, NULL); + set_closure_fn(&dc->disk.cl, cached_dev_flush, system_wq); kobject_init(&dc->disk.kobj, &bch_cached_dev_ktype); - - bch_cache_accounting_init(&dc->accounting, &dc->disk.cl); - - err = bcache_device_init(&dc->disk, block_size); - if (err) - goto err; - - spin_lock_init(&dc->io_lock); - closure_init_unlocked(&dc->sb_write); INIT_WORK(&dc->detach, cached_dev_detach_finish); + closure_init_unlocked(&dc->sb_write); + INIT_LIST_HEAD(&dc->io_lru); + spin_lock_init(&dc->io_lock); + bch_cache_accounting_init(&dc->accounting, &dc->disk.cl); dc->sequential_merge = true; dc->sequential_cutoff = 4 << 20; - INIT_LIST_HEAD(&dc->io_lru); - dc->sb_bio.bi_max_vecs = 1; - dc->sb_bio.bi_io_vec = dc->sb_bio.bi_inline_vecs; - for (io = dc->io; io < dc->io + RECENT_IO; io++) { list_add(&io->lru, &dc->io_lru); hlist_add_head(&io->hash, dc->io_hash + RECENT_IO); } - bch_writeback_init_cached_dev(dc); + ret = bcache_device_init(&dc->disk, block_size); + if (ret) + return ret; + + set_capacity(dc->disk.disk, + dc->bdev->bd_part->nr_sects - dc->sb.data_offset); + + dc->disk.disk->queue->backing_dev_info.ra_pages = + max(dc->disk.disk->queue->backing_dev_info.ra_pages, + q->backing_dev_info.ra_pages); + + bch_cached_dev_request_init(dc); + bch_cached_dev_writeback_init(dc); return 0; -err: - bcache_device_stop(&dc->disk); - return err; } /* Cached device - bcache superblock */ -static const char *register_bdev(struct cache_sb *sb, struct page *sb_page, +static void register_bdev(struct cache_sb *sb, struct page *sb_page, struct block_device *bdev, struct cached_dev *dc) { char name[BDEVNAME_SIZE]; const char *err = "cannot allocate memory"; - struct gendisk *g; struct cache_set *c; - if (!dc || cached_dev_init(dc, sb->block_size << 9) != 0) - return err; - memcpy(&dc->sb, sb, sizeof(struct cache_sb)); - dc->sb_bio.bi_io_vec[0].bv_page = sb_page; dc->bdev = bdev; dc->bdev->bd_holder = dc; - g = dc->disk.disk; - - set_capacity(g, dc->bdev->bd_part->nr_sects - dc->sb.data_offset); - - g->queue->backing_dev_info.ra_pages = - max(g->queue->backing_dev_info.ra_pages, - bdev->bd_queue->backing_dev_info.ra_pages); + bio_init(&dc->sb_bio); + dc->sb_bio.bi_max_vecs = 1; + dc->sb_bio.bi_io_vec = dc->sb_bio.bi_inline_vecs; + dc->sb_bio.bi_io_vec[0].bv_page = sb_page; + get_page(sb_page); - bch_cached_dev_request_init(dc); + if (cached_dev_init(dc, sb->block_size << 9)) + goto err; err = "error creating kobject"; if (kobject_add(&dc->disk.kobj, &part_to_dev(bdev->bd_part)->kobj, @@ -1102,6 +1091,8 @@ static const char *register_bdev(struct cache_sb *sb, struct page *sb_page, if (bch_cache_accounting_add_kobjs(&dc->accounting, &dc->disk.kobj)) goto err; + pr_info("registered backing device %s", bdevname(bdev, name)); + list_add(&dc->list, &uncached_devices); list_for_each_entry(c, &bch_cache_sets, list) bch_cached_dev_attach(dc, c); @@ -1110,15 +1101,10 @@ static const char *register_bdev(struct cache_sb *sb, struct page *sb_page, BDEV_STATE(&dc->sb) == BDEV_STATE_STALE) bch_cached_dev_run(dc); - return NULL; + return; err: - kobject_put(&dc->disk.kobj); pr_notice("error opening %s: %s", bdevname(bdev, name), err); - /* - * Return NULL instead of an error because kobject_put() cleans - * everything up - */ - return NULL; + bcache_device_stop(&dc->disk); } /* Flash only volumes */ @@ -1716,20 +1702,11 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca) size_t free; struct bucket *b; - if (!ca) - return -ENOMEM; - __module_get(THIS_MODULE); kobject_init(&ca->kobj, &bch_cache_ktype); - memcpy(&ca->sb, sb, sizeof(struct cache_sb)); - INIT_LIST_HEAD(&ca->discards); - bio_init(&ca->sb_bio); - ca->sb_bio.bi_max_vecs = 1; - ca->sb_bio.bi_io_vec = ca->sb_bio.bi_inline_vecs; - bio_init(&ca->journal.bio); ca->journal.bio.bi_max_vecs = 8; ca->journal.bio.bi_io_vec = ca->journal.bio.bi_inline_vecs; @@ -1741,18 +1718,17 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca) !init_fifo(&ca->free_inc, free << 2, GFP_KERNEL) || !init_fifo(&ca->unused, free << 2, GFP_KERNEL) || !init_heap(&ca->heap, free << 3, GFP_KERNEL) || - !(ca->buckets = vmalloc(sizeof(struct bucket) * + !(ca->buckets = vzalloc(sizeof(struct bucket) * ca->sb.nbuckets)) || !(ca->prio_buckets = kzalloc(sizeof(uint64_t) * prio_buckets(ca) * 2, GFP_KERNEL)) || !(ca->disk_buckets = alloc_bucket_pages(GFP_KERNEL, ca)) || !(ca->alloc_workqueue = alloc_workqueue("bch_allocator", 0, 1)) || bio_split_pool_init(&ca->bio_split_hook)) - goto err; + return -ENOMEM; ca->prio_last_buckets = ca->prio_buckets + prio_buckets(ca); - memset(ca->buckets, 0, ca->sb.nbuckets * sizeof(struct bucket)); for_each_bucket(b, ca) atomic_set(&b->pin, 0); @@ -1765,22 +1741,28 @@ err: return -ENOMEM; } -static const char *register_cache(struct cache_sb *sb, struct page *sb_page, +static void register_cache(struct cache_sb *sb, struct page *sb_page, struct block_device *bdev, struct cache *ca) { char name[BDEVNAME_SIZE]; const char *err = "cannot allocate memory"; - if (cache_alloc(sb, ca) != 0) - return err; - - ca->sb_bio.bi_io_vec[0].bv_page = sb_page; + memcpy(&ca->sb, sb, sizeof(struct cache_sb)); ca->bdev = bdev; ca->bdev->bd_holder = ca; + bio_init(&ca->sb_bio); + ca->sb_bio.bi_max_vecs = 1; + ca->sb_bio.bi_io_vec = ca->sb_bio.bi_inline_vecs; + ca->sb_bio.bi_io_vec[0].bv_page = sb_page; + get_page(sb_page); + if (blk_queue_discard(bdev_get_queue(ca->bdev))) ca->discard = CACHE_DISCARD(&ca->sb); + if (cache_alloc(sb, ca) != 0) + goto err; + err = "error creating kobject"; if (kobject_add(&ca->kobj, &part_to_dev(bdev->bd_part)->kobj, "bcache")) goto err; @@ -1790,15 +1772,10 @@ static const char *register_cache(struct cache_sb *sb, struct page *sb_page, goto err; pr_info("registered cache device %s", bdevname(bdev, name)); - - return NULL; + return; err: + pr_notice("error opening %s: %s", bdevname(bdev, name), err); kobject_put(&ca->kobj); - pr_info("error opening %s: %s", bdevname(bdev, name), err); - /* Return NULL instead of an error because kobject_put() cleans - * everything up - */ - return NULL; } /* Global interfaces/init */ @@ -1832,12 +1809,15 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, bdev = blkdev_get_by_path(strim(path), FMODE_READ|FMODE_WRITE|FMODE_EXCL, sb); - if (bdev == ERR_PTR(-EBUSY)) - err = "device busy"; - - if (IS_ERR(bdev) || - set_blocksize(bdev, 4096)) + if (IS_ERR(bdev)) { + if (bdev == ERR_PTR(-EBUSY)) + err = "device busy"; goto err; + } + + err = "failed to set blocksize"; + if (set_blocksize(bdev, 4096)) + goto err_close; err = read_super(sb, bdev, &sb_page); if (err) @@ -1845,33 +1825,33 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, if (SB_IS_BDEV(sb)) { struct cached_dev *dc = kzalloc(sizeof(*dc), GFP_KERNEL); + if (!dc) + goto err_close; - err = register_bdev(sb, sb_page, bdev, dc); + register_bdev(sb, sb_page, bdev, dc); } else { struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL); + if (!ca) + goto err_close; - err = register_cache(sb, sb_page, bdev, ca); + register_cache(sb, sb_page, bdev, ca); } - - if (err) { - /* register_(bdev|cache) will only return an error if they - * didn't get far enough to create the kobject - if they did, - * the kobject destructor will do this cleanup. - */ +out: + if (sb_page) put_page(sb_page); -err_close: - blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); -err: - if (attr != &ksysfs_register_quiet) - pr_info("error opening %s: %s", path, err); - ret = -EINVAL; - } - kfree(sb); kfree(path); mutex_unlock(&bch_register_lock); module_put(THIS_MODULE); return ret; + +err_close: + blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); +err: + if (attr != &ksysfs_register_quiet) + pr_info("error opening %s: %s", path, err); + ret = -EINVAL; + goto out; } static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x) diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c index 93e7e31..2714ed3 100644 --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -375,7 +375,7 @@ err: refill_dirty(cl); } -void bch_writeback_init_cached_dev(struct cached_dev *dc) +void bch_cached_dev_writeback_init(struct cached_dev *dc) { closure_init_unlocked(&dc->writeback); init_rwsem(&dc->writeback_lock); -- 2.7.4