From: Christoph Hellwig <hch@lst.de> mainline inclusion from mainline-5.6-rc1 commit cfa0c56db9c087227988f6af2c7b9888d24a3b16 category: feature bugzilla: 43003 CVE: NA --------------------------- 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> Acked-by: Hanjun Guo <guohanjun@huawei.com> Reviewed-by: Yufen Yu <yuyufen@huawei.com> Signed-off-by: zhangyi (F) <yi.zhang@huawei.com> Signed-off-by: Yang Yingliang <yangyingliang@huawei.com> --- drivers/md/bcache/super.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index ce86fa7c70a6..43ba87c16617 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -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; @@ -1356,7 +1356,7 @@ 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) { @@ -1370,7 +1370,7 @@ 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; @@ -2253,7 +2253,7 @@ static int cache_alloc(struct cache *ca) 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 */ @@ -2265,7 +2265,7 @@ 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); @@ -2368,8 +2368,8 @@ 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; @@ -2419,7 +2419,7 @@ 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; @@ -2431,7 +2431,7 @@ 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) @@ -2443,7 +2443,7 @@ 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; } @@ -2454,7 +2454,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr, 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: -- 2.25.1