[PATCH] df: handle bind mounts when processing device nodes

[Pádraig Brady]

Consider these standard bind mounts on my system:

$ grep sdb2 /proc/mounts
/dev/sdb2 / ext4 rw,seclabel,relatime,user_xattr,barrier=1,data=ordered 0 0
/dev/sdb2 /tmp ext4 rw,seclabel,relatime,user_xattr,barrier=1,data=ordered 0 0
/dev/sdb2 /var/tmp ext4 rw,seclabel,relatime,user_xattr,barrier=1,data=ordered 
0 0

Current df picks the last one:

$ df -h /dev/sdb2
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb2        13G  8.0G  4.5G  64% /var/tmp

The attached patch uses the same technique as when handling
non device node arguments, to use the shortest mount point:

$ src/df /dev/sdb2
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdb2        13G  8.0G  4.5G  64% /

thanks,
Pádraig.

df-disk-shortest.patch
Description: Text Data