diff options
| -rw-r--r-- | fs/block_dev.c | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c index 045f98854f14..8cc144ffc382 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -543,11 +543,11 @@ static struct kobject *bdev_get_holder(struct block_device *bdev) return kobject_get(bdev->bd_disk->holder_dir); } -static void add_symlink(struct kobject *from, struct kobject *to) +static int add_symlink(struct kobject *from, struct kobject *to) { if (!from || !to) - return; - sysfs_create_link(from, to, kobject_name(to)); + return 0; + return sysfs_create_link(from, to, kobject_name(to)); } static void del_symlink(struct kobject *from, struct kobject *to) @@ -648,30 +648,38 @@ static void free_bd_holder(struct bd_holder *bo) * If there is no matching entry with @bo in @bdev->bd_holder_list, * add @bo to the list, create symlinks. * - * Returns 1 if @bo was added to the list. - * Returns 0 if @bo wasn't used by any reason and should be freed. + * Returns 0 if symlinks are created or already there. + * Returns -ve if something fails and @bo can be freed. */ static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo) { struct bd_holder *tmp; + int ret; if (!bo) - return 0; + return -EINVAL; list_for_each_entry(tmp, &bdev->bd_holder_list, list) { if (tmp->sdir == bo->sdir) { tmp->count++; + /* We've already done what we need to do here. */ + free_bd_holder(bo); return 0; } } if (!bd_holder_grab_dirs(bdev, bo)) - return 0; + return -EBUSY; - add_symlink(bo->sdir, bo->sdev); - add_symlink(bo->hdir, bo->hdev); - list_add_tail(&bo->list, &bdev->bd_holder_list); - return 1; + ret = add_symlink(bo->sdir, bo->sdev); + if (ret == 0) { + ret = add_symlink(bo->hdir, bo->hdev); + if (ret) + del_symlink(bo->sdir, bo->sdev); + } + if (ret == 0) + list_add_tail(&bo->list, &bdev->bd_holder_list); + return ret; } /** @@ -741,7 +749,9 @@ static int bd_claim_by_kobject(struct block_device *bdev, void *holder, mutex_lock_nested(&bdev->bd_mutex, BD_MUTEX_PARTITION); res = bd_claim(bdev, holder); - if (res || !add_bd_holder(bdev, bo)) + if (res == 0) + res = add_bd_holder(bdev, bo); + if (res) free_bd_holder(bo); mutex_unlock(&bdev->bd_mutex); |