• Miklos Szeredi's avatar
    add filesystem subtype support · 79c0b2df
    Miklos Szeredi authored
    There's a slight problem with filesystem type representation in fuse
    based filesystems.
    From the kernel's view, there are just two filesystem types: fuse and
    fuseblk.  From the user's view there are lots of different filesystem
    types.  The user is not even much concerned if the filesystem is fuse based
    or not.  So there's a conflict of interest in how this should be
    represented in fstab, mtab and /proc/mounts.
    The current scheme is to encode the real filesystem type in the mount
    source.  So an sshfs mount looks like this:
      sshfs#user@server:/   /mnt/server    fuse   rw,nosuid,nodev,...
    This url-ish syntax works OK for sshfs and similar filesystems.  However
    for block device based filesystems (ntfs-3g, zfs) it doesn't work, since
    the kernel expects the mount source to be a real device name.
    A possibly better scheme would be to encode the real type in the type
    field as "type.subtype".  So fuse mounts would look like this:
      /dev/hda1       /mnt/windows   fuseblk.ntfs-3g   rw,...
      user@server:/   /mnt/server    fuse.sshfs        rw,nosuid,nodev,...
    This patch adds the necessary code to the kernel so that this can be
    correctly displayed in /proc/mounts.
    Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
filesystems.c 5.46 KB