Greeting all,
I have multiple subvolumes on the same filesystem that are mounted with
different options in fstab.
The problem is the mount options for subsequent subvolume mounts seem to be
ignored as reflected in /proc/mounts.
$ cat /etc/fstab | grep mnt
UUID=<REMOVED> /mnt/a btrfs
subvol=a,defaults,nodatacow,autodefrag,noatime,space_cache,inode_cache 0 0
UUID=<REMOVED> /mnt/b btrfs
subvol=b,defaults,autodefrag,noatime,space_cache,inode_cache 0 0
UUID=<REMOVED> /mnt/c btrfs
subvol=c,defaults,compress=zlib,autodefrag,noatime,space_cache,inode_cache 0 0
$ mount | grep mnt
/dev/sdb2 on /mnt/a type btrfs
(rw,noatime,subvol=a,nodatacow,autodefrag,space_cache,inode_cache)
/dev/sdb2 on /mnt/b type btrfs
(rw,noatime,subvol=b,autodefrag,space_cache,inode_cache)
/dev/sdb2 on /mnt/c type btrfs
(rw,noatime,subvol=c,compress=zlib,autodefrag,space_cache,inode_cache)
$ cat /proc/mounts | grep mnt
/dev/sdb2 /mnt/a btrfs
rw,noatime,nodatasum,nodatacow,space_cache,autodefrag,inode_cache 0 0
/dev/sdb2 /mnt/b btrfs
rw,noatime,nodatasum,nodatacow,space_cache,autodefrag,inode_cache 0 0
/dev/sdb2 /mnt/c btrfs
rw,noatime,nodatasum,nodatacow,space_cache,autodefrag,inode_cache 0 0
continuing the example which should only change the mount options for one of
the subvolumes:
$ sudo mount -o remount,compress=zlib /mnt/oldhome
$ cat /proc/mounts | grep mnt
/dev/sdb2 /mnt/a btrfs
rw,noatime,nodatasum,nodatacow,compress=zlib,space_cache,autodefrag,inode_cache
0 0
/dev/sdb2 /mnt/b btrfs
rw,noatime,nodatasum,nodatacow,compress=zlib,space_cache,autodefrag,inode_cache
0 0
/dev/sdb2 /mnt/c btrfs
rw,noatime,nodatasum,nodatacow,compress=zlib,space_cache,autodefrag,inode_cache
0 0
Running Ubuntu mainline kernel 3.2.1 (3.2.1-030201-generic #201201121644 SMP
Thu Jan 12 21:53:24 UTC 2012 i686 athlon i386 GNU/Linux) with most recent
btrfs-progs (2011-12-01) from linux/kernel/git/mason/btrfs-progs.git
Thanks,
Kyle
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