On Mon, Oct 09, 2017 at 11:07:43AM +0800, Anand Jain wrote:
> add_missing_dev() can return device pointer so that IS_ERR/
> PTR_ERR can be used to check for the actual error occurred
> in the function.
>
> Signed-off-by: Anand Jain <anand.j...@oracle.com>
> ---
> v2: This patch is a split from
> [PATCH 1/2] btrfs: fix read_one_chunk() return error code
>
> fs/btrfs/volumes.c | 13 ++++++++-----
> 1 file changed, 8 insertions(+), 5 deletions(-)
>
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 0e8f16c305df..2f500a32089e 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -6249,7 +6249,7 @@ static struct btrfs_device *add_missing_dev(struct
> btrfs_fs_devices *fs_devices,
>
> device = btrfs_alloc_device(NULL, &devid, dev_uuid);
> if (IS_ERR(device))
> - return NULL;
> + return device;
>
> list_add(&device->dev_list, &fs_devices->devices);
> device->fs_devices = fs_devices;
> @@ -6454,9 +6454,12 @@ static int read_one_chunk(struct btrfs_fs_info
> *fs_info, struct btrfs_key *key,
> map->stripes[i].dev =
> add_missing_dev(fs_info->fs_devices, devid,
> uuid);
> - if (!map->stripes[i].dev) {
> + if (IS_ERR(map->stripes[i].dev)) {
> free_extent_map(em);
> - return -EIO;
> + btrfs_err(fs_info,
> + "failed to init missing dev %llu %ld",
> + devid, PTR_ERR(map->stripes[i].dev));
> + return PTR_ERR(map->stripes[i].dev);
> }
> btrfs_report_missing_device(fs_info, devid, uuid);
> }
> @@ -6582,8 +6585,8 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
> }
>
> device = add_missing_dev(fs_devices, devid, dev_uuid);
> - if (!device)
> - return -ENOMEM;
> + if (IS_ERR(device))
> + return PTR_ERR(device);
Could you please also add a btrfs_err() like above?
With that,
Reviewed-by: Liu Bo <bo.li....@oracle.com>
-liubo
> btrfs_report_missing_device(fs_info, devid, dev_uuid);
> } else {
> if (!device->bdev) {
> --
> 2.7.0
>
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