On 11/25/2014 03:11 AM, boris wrote:
> Hi all,
>
> I was looking for a quick method of testing whether a working directory is a
> subvolume.
Currently btrfs check that:
- the inode number is 255
- the path is a directory
>From cmds-subvolume.c
[...]
/*
* test if path is a subvolume:
* this function return
* 0-> path exists but it is not a subvolume
* 1-> path exists and it is a subvolume
* -1 -> path is unaccessible
*/
int test_issubvolume(char *path)
{
struct stat st;
int res;
res = stat(path, &st);
if(res < 0 )
return -1;
return (st.st_ino == 256) && S_ISDIR(st.st_mode);
}
[---]
>
> Couldn't see an obvious one, so tried 'btrfs show <somesubvol≥'. It printed
> a fail message as expected but returned 0 exit status. Bug?
>
> Can I put in a feature request for a shell file test operator for subvols,
> please (or something of the kind)? http://tldp.org/LDP/abs/html/fto.html .
> The letter v (for volume, both upper and lower case forms; one for subvol,
> other for snapshots) is unused afaict.
>
> Have I missed the obvious? Or scored a false positive?
>
> TIA.
>
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