On Wed, 12 Dec 2012 11:22:49 +0800, Jeff Liu wrote:
> Signed-off-by: Jie Liu <jeff.liu@xxxxxxxxxx>
> Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
>
> ---
> fs/btrfs/ioctl.c | 14 ++++++++++++++
> fs/btrfs/ioctl.h | 2 ++
> 2 files changed, 16 insertions(+)
>
> diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
> index 8fcf9a5..b0a5e17 100644
> --- a/fs/btrfs/ioctl.c
> +++ b/fs/btrfs/ioctl.c
> @@ -3699,6 +3699,18 @@ out:
> return ret;
> }
>
> +static int btrfs_ioctl_get_fslabel(struct btrfs_root *root, void __user *arg)
> +{
> + const char *label = root->fs_info->super_copy->label;
> + int ret;
> +
> + mutex_lock(&root->fs_info->volume_mutex);
> + ret = copy_to_user(arg, label, strlen(label));
> + mutex_unlock(&root->fs_info->volume_mutex);
> +
> + return ret ? -EFAULT : 0;
> +}
> +
> long btrfs_ioctl(struct file *file, unsigned int
> cmd, unsigned long arg)
> {
> @@ -3797,6 +3809,8 @@ long btrfs_ioctl(struct file *file, unsigned int
> return btrfs_ioctl_qgroup_create(root, argp);
> case BTRFS_IOC_QGROUP_LIMIT:
> return btrfs_ioctl_qgroup_limit(root, argp);
> + case BTRFS_IOC_GET_FSLABEL:
> + return btrfs_ioctl_get_fslabel(root, argp);
> }
>
> return -ENOTTY;
> diff --git a/fs/btrfs/ioctl.h b/fs/btrfs/ioctl.h
> index 731e287..98f896f 100644
> --- a/fs/btrfs/ioctl.h
> +++ b/fs/btrfs/ioctl.h
> @@ -453,4 +453,6 @@ struct btrfs_ioctl_send_args {
> struct btrfs_ioctl_qgroup_limit_args)
> #define BTRFS_IOC_GET_DEV_STATS _IOWR(BTRFS_IOCTL_MAGIC, 52, \
> struct btrfs_ioctl_get_dev_stats)
> +#define BTRFS_IOC_GET_FSLABEL _IOR(BTRFS_IOCTL_MAGIC, 53, \
> + char[BTRFS_LABEL_SIZE])
> #endif
>
According to the project idea web,
https://btrfs.wiki.kernel.org/index.php/Project_ideas#Development_notes.2C_please_read
number 53 has been used for the drive swapping commands, so I think we should
choose another one. Maybe 49 is good since the above web says number 50 has been
reserved for set/change label command.
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
