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bcache: return a pointer to the on-disk sb from read_super 

Returning the properly typed actual data structure insteaf of the
containing struct page will save the callers some work going
forward.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-01-24 01:01:32 +08:00 коммит произвёл Jens Axboe
Родитель fc8f19cc5d
Коммит cfa0c56db9
1 изменённых файлов: 11 добавлений и 11 удалений
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22
drivers/md/bcache/super.c
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@ -60,7 +60,7 @@ struct workqueue_struct *bch_journal_wq;
/* Superblock */
static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
struct page **res)
struct cache_sb_disk **res)
{
const char *err;
struct cache_sb_disk *s;
@ -191,7 +191,7 @@ static const char *read_super(struct cache_sb *sb, struct block_device *bdev,
err = NULL;
get_page(bh->b_page);
*res = bh->b_page;
*res = s;
err:
put_bh(bh);
return err;
@ -1353,7 +1353,7 @@ static int cached_dev_init(struct cached_dev *dc, unsigned int block_size)
/* Cached device - bcache superblock */
static int register_bdev(struct cache_sb *sb, struct page *sb_page,
static int register_bdev(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
struct block_device *bdev,
struct cached_dev *dc)
{
@ -1367,7 +1367,7 @@ static int register_bdev(struct cache_sb *sb, struct page *sb_page,
dc->bdev->bd_holder = dc;
bio_init(&dc->sb_bio, dc->sb_bio.bi_inline_vecs, 1);
bio_first_bvec_all(&dc->sb_bio)->bv_page = sb_page;
bio_first_bvec_all(&dc->sb_bio)->bv_page = virt_to_page(sb_disk);
if (cached_dev_init(dc, sb->block_size << 9))
goto err;
@ -2260,7 +2260,7 @@ err_free:
return ret;
}
static int register_cache(struct cache_sb *sb, struct page *sb_page,
static int register_cache(struct cache_sb *sb, struct cache_sb_disk *sb_disk,
struct block_device *bdev, struct cache *ca)
{
const char *err = NULL; /* must be set for any error case */
@ -2272,7 +2272,7 @@ static int register_cache(struct cache_sb *sb, struct page *sb_page,
ca->bdev->bd_holder = ca;
bio_init(&ca->sb_bio, ca->sb_bio.bi_inline_vecs, 1);
bio_first_bvec_all(&ca->sb_bio)->bv_page = sb_page;
bio_first_bvec_all(&ca->sb_bio)->bv_page = virt_to_page(sb_disk);
if (blk_queue_discard(bdev_get_queue(bdev)))
ca->discard = CACHE_DISCARD(&ca->sb);
@ -2375,8 +2375,8 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
const char *err;
char *path = NULL;
struct cache_sb *sb;
struct cache_sb_disk *sb_disk;
struct block_device *bdev;
struct page *sb_page;
ssize_t ret;
ret = -EBUSY;
@ -2426,7 +2426,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (set_blocksize(bdev, 4096))
goto out_blkdev_put;
err = read_super(sb, bdev, &sb_page);
err = read_super(sb, bdev, &sb_disk);
if (err)
goto out_blkdev_put;
@ -2438,7 +2438,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
goto out_put_sb_page;
mutex_lock(&bch_register_lock);
ret = register_bdev(sb, sb_page, bdev, dc);
ret = register_bdev(sb, sb_disk, bdev, dc);
mutex_unlock(&bch_register_lock);
/* blkdev_put() will be called in cached_dev_free() */
if (ret < 0)
@ -2450,7 +2450,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
goto out_put_sb_page;
/* blkdev_put() will be called in bch_cache_release() */
if (register_cache(sb, sb_page, bdev, ca) != 0)
if (register_cache(sb, sb_disk, bdev, ca) != 0)
goto out_free_sb;
}
@ -2461,7 +2461,7 @@ done:
return size;
out_put_sb_page:
put_page(sb_page);
put_page(virt_to_page(sb_disk));
out_blkdev_put:
blkdev_put(bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
out_free_sb: