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Commit f59fce84 authored by Kent Overstreet's avatar Kent Overstreet
Browse files

bcache: Fix error handling in init code 



This code appears to have rotted... fix various bugs and do some
refactoring.

Signed-off-by: default avatarKent Overstreet <koverstreet@google.com>
parent fe0a797a

drivers/md/bcache/bcache.h

+1 −1
Original line number Diff line number Diff line
@@ -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);

drivers/md/bcache/stats.c

+16 −18
Original line number Diff line number Diff line
@@ -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);

}

drivers/md/bcache/super.c

+81 −101
Original line number Diff line number Diff line
@@ -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;
@@ -998,6 +990,7 @@ static void cached_dev_free(struct closure *cl) 


	mutex_lock(&bch_register_lock);



	if (atomic_read(&dc->running))

		bd_unlink_disk_holder(dc->bdev, dc->disk.disk);

	bcache_device_free(&dc->disk);

	list_del(&dc->list);
@@ -1005,7 +998,9 @@ static void cached_dev_free(struct closure *cl) 
	mutex_unlock(&bch_register_lock);



	if (!IS_ERR_OR_NULL(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 @@ static int cache_alloc(struct cache_sb *sb, struct cache *ca) 
	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 (IS_ERR(bdev)) {

		if (bdev == ERR_PTR(-EBUSY))

			err = "device busy";



	if (IS_ERR(bdev) ||

	    set_blocksize(bdev, 4096))

		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);

	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;

	}



	kfree(sb);

	kfree(path);

	mutex_unlock(&bch_register_lock);

	module_put(THIS_MODULE);

	return ret;

	goto out;

}



static int bcache_reboot(struct notifier_block *n, unsigned long code, void *x)

drivers/md/bcache/writeback.c

+1 −1
Original line number Diff line number Diff line
@@ -375,7 +375,7 @@ static void read_dirty(struct closure *cl) 
	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);