On 12.07.2018 09:23, Gu Jinxiang wrote:
> fs_devices is always passed to btrfs_scan_one_device which
> overrides it. And in the call stack below fs_devices is passed to
> btrfs_scan_one_device from btrfs_mount_root.
> And in btrfs_mount_root the output fs_devices of this call stack
> is not used.
> btrfs_mount_root
> -> btrfs_parse_early_options
> ->btrfs_scan_one_device
> So, there is no necessary to pass fs_devices from btrfs_mount_root,
> use a local variable in btrfs_parse_early_options is enough.
>
> Signed-off-by: Gu Jinxiang <gujx@xxxxxxxxxxxxxx>
> Reviewed-by: Anand Jain <Anand.Jain@xxxxxxxxxx>
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
> ---
>
> Changelog:
> v4: changed a line warp, and adjusted the order of two rows.
> v3: rebase to misc-next.
> v2: deal with Nikolay's comment, make changelog more clair.
>
> fs/btrfs/super.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 39d8e39b2fe1..44f58bdb5fa6 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -884,10 +884,11 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
> * only when we need to allocate a new super block.
> */
> static int btrfs_parse_early_options(const char *options, fmode_t flags,
> - void *holder, struct btrfs_fs_devices **fs_devices)
> + void *holder)
> {
> substring_t args[MAX_OPT_ARGS];
> char *device_name, *opts, *orig, *p;
> + struct btrfs_fs_devices *fs_devices = NULL;
> int error = 0;
>
> if (!options)
> @@ -916,7 +917,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
> goto out;
> }
> error = btrfs_scan_one_device(device_name,
> - flags, holder, fs_devices);
> + flags, holder, &fs_devices);
> kfree(device_name);
> if (error)
> goto out;
> @@ -1524,8 +1525,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
> if (!(flags & SB_RDONLY))
> mode |= FMODE_WRITE;
>
> - error = btrfs_parse_early_options(data, mode, fs_type,
> - &fs_devices);
> + error = btrfs_parse_early_options(data, mode, fs_type);
> if (error) {
> return ERR_PTR(error);
> }
>
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