Re: df -t fails to filter fs type

[Dmitry V. Levin]

On Sat, Feb 05, 2011 at 03:28:01AM +0300, Dmitry V. Levin wrote:
[...]
> + df -T -t btrfs -t xfs -t ext4 -t ocfs2 -t gfs2 .
> df: Warning: cannot read table of mounted file systems
> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
> -                -    10485760    793504   9692256   8% /
> 
> Looks like df agrees on the list of allowed fs types when it fails to find
> out the fs type of the given filesystem, e.g. when /etc/mtab is a symlink
> to /proc/mounts where given filesystem is not listed.

$ ls -log /etc/mtab
lrwxrwxrwx 1 12 Feb  5 00:22 /etc/mtab -> /proc/mounts
$ cat /etc/mtab
proc /proc proc rw,nosuid 0 0
$ strace -estatfs df -T -t ext4 /
statfs("/", {f_type=0x1021994, f_bsize=4096, f_blocks=2621440, f_bfree=2280903, 
f_bavail=2280903, f_files=1048576, f_ffree=999965, f_fsid={0, 0}, 
f_namelen=255, f_frsize=4096}) = 0
Filesystem    Type   1K-blocks      Used Available Use% Mounted on
-                -    10485760   1362148   9123612  13% /

That is, the fs type is 0x1021994 (S_MAGIC_TMPFS) but df fails to
recognize that and agrees that it meets "ext4" limit.


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