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authorColy Li <colyli@suse.de>2019-04-25 00:48:37 +0800
committerJens Axboe <axboe@kernel.dk>2019-04-24 10:56:28 -0600
commit88c12d42d2bb6e05deb3cfd24d12f6fe80544575 (patch)
treea468c2ee2f98c1e94073fe7c5b178489c65f7784 /drivers/md
parent68d10e6979a3b59e3cd2e90bfcafed79c4cf180a (diff)
downloadlinux-88c12d42d2bb6e05deb3cfd24d12f6fe80544575.tar.gz
bcache: add error check for calling register_bdev()
This patch adds return value to register_bdev(). Then if failure happens inside register_bdev(), its caller register_bcache() may detect and handle the failure more properly. Signed-off-by: Coly Li <colyli@suse.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/md')
-rw-r--r--drivers/md/bcache/super.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index f8d80adcafec..fde334939545 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1279,7 +1279,7 @@ static int cached_dev_init(struct cached_dev *dc, unsigned int block_size)
/* Cached device - bcache superblock */
-static void register_bdev(struct cache_sb *sb, struct page *sb_page,
+static int register_bdev(struct cache_sb *sb, struct page *sb_page,
struct block_device *bdev,
struct cached_dev *dc)
{
@@ -1317,10 +1317,11 @@ static void register_bdev(struct cache_sb *sb, struct page *sb_page,
BDEV_STATE(&dc->sb) == BDEV_STATE_STALE)
bch_cached_dev_run(dc);
- return;
+ return 0;
err:
pr_notice("error %s: %s", dc->backing_dev_name, err);
bcache_device_stop(&dc->disk);
+ return -EIO;
}
/* Flash only volumes */
@@ -2271,7 +2272,7 @@ static bool bch_is_open(struct block_device *bdev)
static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
const char *buffer, size_t size)
{
- ssize_t ret = size;
+ ssize_t ret = -EINVAL;
const char *err = "cannot allocate memory";
char *path = NULL;
struct cache_sb *sb = NULL;
@@ -2305,7 +2306,7 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (!IS_ERR(bdev))
bdput(bdev);
if (attr == &ksysfs_register_quiet)
- goto out;
+ goto quiet_out;
}
goto err;
}
@@ -2326,8 +2327,10 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
goto err_close;
mutex_lock(&bch_register_lock);
- register_bdev(sb, sb_page, bdev, dc);
+ ret = register_bdev(sb, sb_page, bdev, dc);
mutex_unlock(&bch_register_lock);
+ if (ret < 0)
+ goto err;
} else {
struct cache *ca = kzalloc(sizeof(*ca), GFP_KERNEL);
@@ -2337,6 +2340,8 @@ static ssize_t register_bcache(struct kobject *k, struct kobj_attribute *attr,
if (register_cache(sb, sb_page, bdev, ca) != 0)
goto err;
}
+quiet_out:
+ ret = size;
out:
if (sb_page)
put_page(sb_page);
@@ -2349,7 +2354,6 @@ err_close:
blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
err:
pr_info("error %s: %s", path, err);
- ret = -EINVAL;
goto out;
}