Hi, As the subject specifies there is some confusion (at least with me:) as to what should be the ouput/behaviour of command btrfs fi df
Please refer to https://bugzilla.redhat.com/show_bug.cgi?id=1114995 The comment by Eric Sendeen further complicates the understanding. (again with me:) 1} The command btrfs fi df has been more or less been equated with traditional df. The problem is that traditional df does not output error when no path is given as what currently is done by btrfs fi df 2} Traditional df outputs a column 'Mounted on' for each device/fs it finds which btrfs fi df does not. For Ex. [vikram@localhost ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/sdb6 153942744 69903440 81431312 47% / devtmpfs 1520392 0 1520392 0% /dev tmpfs 1527612 1444 1526168 1% /dev/shm tmpfs 1527612 9108 1518504 1% /run tmpfs 1527612 0 1527612 0% /sys/fs/cgroup tmpfs 1527612 120 1527492 1% /tmp /dev/sda1 1515376 172040 1248312 13% /boot /dev/dm-0 330327632 230022072 97561080 71% /home/vikram [vikram@localhost ~]# btrfs fi df /usr/ Data, RAID1: total=42.00GiB, used=32.44GiB System, RAID1: total=32.00MiB, used=12.00KiB Metadata, RAID1: total=2.00GiB, used=915.04MiB [vikram@localhost ~]# btrfs fi df / Data, RAID1: total=42.00GiB, used=32.44GiB System, RAID1: total=32.00MiB, used=12.00KiB Metadata, RAID1: total=2.00GiB, used=915.04MiB [ivikram@localhost ~]# btrfs fi show Label: 'fedora' uuid: d2b3420c-99c1-44cc-a922-ac266072c7fb Total devices 2 FS bytes used 33.33GiB devid 2 size 73.51GiB used 44.03GiB path /dev/sdb6 devid 3 size 73.30GiB used 44.03GiB path /dev/sda2 Label: 'Vikram' uuid: 0809b072-35f3-4866-92b8-af4772b23ed6 Total devices 2 FS bytes used 109.68GiB devid 1 size 158.03GiB used 157.00GiB path /dev/dm-0 devid 2 size 157.00GiB used 157.00GiB path /dev/mapper/sdb1 So there in no way to understand if there was an error (except for non existant path) in the path argument given to btrfs fi df. This can create a lot of confusion in administeration. So IMHO some changes need to done to btrfs fi df. 1} The requirement for path arg be removed, since that gives a false impression by a valid output that the arg was correct as in fs mount point sense POV. 2} btrfs fi df should output the mount point in all cases: a} Where arg path is valid but not a mount point. Should output btrfs FS info with mount point as traditional df. b} Where arg path is valid & is also a mount point. Should show output for that mount only. c} Where no arg is given, Should output all btrfs FSes info with mount points. 3} btrfs fi df should error out on an invalid path as it does currently. Thanks for your precious time. -- vikram... |||||||| |||||||| ^^'''''^^||root||^^^'''''''^^ // \\ )) //(( \\// \\ // /\\ || \\ || / )) (( \\ -- Nice boy, but about as sharp as a sack of wet mice. -- Foghorn Leghorn -- o ~|~ = -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
