-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 11/26/2013 06:37 PM, Bernhard Voelker wrote: > As already mentioned, the current implementation is not ideal. It > is a compromise between the requirements which hit 'df' at that > time: > > * showing the real root file system instead of early-boot rootfs: > > $ src/df -a | grep ' /$' rootfs 12095032 7988888 > 3491744 70% / /dev/sda1 12095032 7988888 3491744 70% > /
That doesn't seem to be at all related since the path on both is exactly the same, not one longer than the other, and is filtered by the fstype being "rootfs". For that matter, this has always seemed like a bug in the kernel to me: rootfs isn't mounted in /, it is mounted above / and therefore is not visible to this process, so it shouldn't be shown in /proc/mounts. > * suppressing massive bind-mounts with hundreds or thousands of > bind mounts of the same file system: > > $ for f in $(seq 1000) ; do mkdir dir$f \ && mount -o bind /etc > dir$f ; \ done and then look at 'df' vs. 'df -a'. Yes, the whole topic is hiding bind mounts; the question is how to choose which one to hide. Why use the path length instead of which was mounted first? > * IIRC there was a another issue re. shortening mount information > like: > /dev/disk/by-id/scsi-SATA_Hitachi_HDS7210_JP2911N03AR0WV-part1 Again, that seems totally unrelated. The by-id is a symlink so it is followed to the underlying devnode and that's what is reported in /proc/mounts, and it doesn't have anything to do with the length of the mount point. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.14 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCgAGBQJSlU+JAAoJEI5FoCIzSKrwJnEH/jYK117dsdMOQWJsSBqYIRUD fI4ilZjsTPb5n49dlsN4oXI/phzdFvGTKdw3LRNYv2MJhG2KcQScIRqIgV4OT+Rr 9RsRAHtvGF7j89AtdKbu4HVQlFm450WrqAsReg9vnjCrj6q57Ms/CXp4GNHDu1HD JaNZ/8XlpLAsJR9rz62+R1GCqQF4yZbwRDgudy8gxG1OcXmO24Wk6SE03Q0Ss8Ho QFSreq9Bpzs4l/BAkqLuAXJAMBHX5gQ1R/URbHv+m3mW6RnCVryjSQmOGd7+wWRn Y6ttY+OGU9334ckwfsJ4lD448fY2/81ty89NhrkKPuXwZbUj1ocJiZK8SWyfcAE= =pAtS -----END PGP SIGNATURE-----