On 2018年03月03日 02:47, je...@suse.com wrote:
> From: Jeff Mahoney <je...@suse.com>
> 
> This patch reports on the first-level qgroup, if any, associated with
> a particular subvolume.  It displays the usage and limit, subject
> to the usual unit parameters.
> 
> Signed-off-by: Jeff Mahoney <je...@suse.com>
> ---
>  cmds-subvolume.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
> 
> diff --git a/cmds-subvolume.c b/cmds-subvolume.c
> index 8a473f7a..29d0e0e5 100644
> --- a/cmds-subvolume.c
> +++ b/cmds-subvolume.c
> @@ -972,6 +972,7 @@ static const char * const cmd_subvol_show_usage[] = {
>       "Show more information about the subvolume",
>       "-r|--rootid   rootid of the subvolume",
>       "-u|--uuid     uuid of the subvolume",
> +     HELPINFO_UNITS_SHORT_LONG,
>       "",
>       "If no option is specified, <subvol-path> will be shown, otherwise",
>       "the rootid or uuid are resolved relative to the <mnt> path.",
> @@ -993,6 +994,13 @@ static int cmd_subvol_show(int argc, char **argv)
>       int by_uuid = 0;
>       u64 rootid_arg;
>       u8 uuid_arg[BTRFS_UUID_SIZE];
> +     struct btrfs_qgroup_stats stats;
> +     unsigned int unit_mode;
> +     const char *referenced_size;
> +     const char *referenced_limit_size = "-";
> +     unsigned field_width = 0;
> +
> +     unit_mode = get_unit_mode_from_arg(&argc, argv, 1);
>  
>       while (1) {
>               int c;
> @@ -1112,6 +1120,44 @@ static int cmd_subvol_show(int argc, char **argv)
>       btrfs_list_subvols_print(fd, filter_set, NULL, BTRFS_LIST_LAYOUT_RAW,
>                       1, raw_prefix);
>  
> +     ret = btrfs_qgroup_query(fd, get_ri.root_id, &stats);
> +     if (ret < 0) {
> +             if (ret == -ENODATA)
> +                     printf("Quotas must be enabled for per-subvolume 
> usage\n");

This seems a little confusing.
If quota is disabled, we get ENOTTY not ENODATA.

For ENODATA we know quota is enabled but just no info for this qgroup.

Thanks,
Qu

> +             else if (ret != -ENOTTY)
> +                     fprintf(stderr,
> +                             "\nERROR: BTRFS_IOC_QUOTA_QUERY failed: %s\n",
> +                             strerror(errno));
> +             goto out;
> +     }
> +
> +     printf("\tQuota Usage:\t\t");
> +     fflush(stdout);
> +
> +     referenced_size = pretty_size_mode(stats.info.referenced, unit_mode);
> +     if (stats.limit.max_referenced)
> +            referenced_limit_size = pretty_size_mode(
> +                                             stats.limit.max_referenced,
> +                                             unit_mode);
> +     field_width = max(strlen(referenced_size),
> +                       strlen(referenced_limit_size));
> +
> +     printf("%-*s referenced, %s exclusive\n ", field_width,
> +            referenced_size,
> +            pretty_size_mode(stats.info.exclusive, unit_mode));
> +
> +     printf("\tQuota Limits:\t\t");
> +     if (stats.limit.max_referenced || stats.limit.max_exclusive) {
> +             const char *excl = "-";
> +
> +             if (stats.limit.max_exclusive)
> +                    excl = pretty_size_mode(stats.limit.max_exclusive,
> +                                            unit_mode);
> +             printf("%-*s referenced, %s exclusive\n", field_width,
> +                    referenced_limit_size, excl);
> +     } else
> +             printf("None\n");
> +
>  out:
>       /* clean up */
>       free(get_ri.path);
> 

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