[LTP] [PATCH v3 2/3] lib/tst_device.c: check for BTRFS_SUPER_MAGIC instead of device major of 0

[Jeff Moyer]

Petr Vorel <pvorel@suse.cz> writes:

> Hi Jeff,
>
>> stat() may return a major number of 0 in st_dev for any number of
>> pseudo file systems.  Check for the exact file system instead.  There
>> should be no change in behavior with this patch.
>
> LGTM, thank you!
> Reviewed-by: Petr Vorel <pvorel@suse.cz>
>
> FYI I'll apply very minor formatting fix before merge.

Yup, that looks fine to me.  Thanks for taking care of that!

-Jeff

> +++ lib/tst_device.c
> @@ -559,12 +559,10 @@ static void btrfs_get_uevent_path(char *tmp_path, char *uevent_path)
>  
>  	uevent_path[0] = '\0';
>  
> -	if (d) {
> -		sprintf(uevent_path, "%s/%s/uevent",
> -			bdev_path, d->d_name);
> -	} else {
> -		tst_brkm(TBROK | TERRNO, NULL, "No backing device found while looking in %s.", bdev_path);
> -	}
> +	if (d)
> +		sprintf(uevent_path, "%s/%s/uevent", bdev_path, d->d_name);
> +	else
> +		tst_brkm(TBROK | TERRNO, NULL, "No backing device found while looking in %s", bdev_path);
>  
>  	if (SAFE_READDIR(NULL, dir))
>  		tst_resm(TINFO, "Warning: used first of multiple backing device.");
> @@ -600,7 +598,7 @@ void tst_find_backing_dev(const char *path, char *dev, size_t dev_size)
>  	if (fsbuf.f_type == TST_BTRFS_MAGIC) {
>  		btrfs_get_uevent_path(tmp_path, uevent_path);
>  	} else if (dev_major == 0) {
> -		tst_brkm(TBROK, NULL, "%s resides on an unsupported pseudo-file system.", path);
> +		tst_brkm(TBROK, NULL, "%s resides on an unsupported pseudo-file system", path);
>  	} else {
>  		tst_resm(TINFO, "Use uevent strategy");
>  		sprintf(uevent_path,