df: auto fs's don't show in normal df

[Burton Windle]

Hello. I recently started using Ext3, and based on advice on the LKML,
changed my /etc/fstab to mount / as auto (incase I didn't have ext2
support). This was tested on 2.4.16, as well as 2.5.1-pre4. 

Now, my / partition doesn't show up in 'df' unless I do 'df -a' or
explictly as for /

If I change my /etc/fstab to mount / as ext3 instead of auto, it works
again.

cypher:~# df --version
df (fileutils) 4.1

cypher:~# dpkg -s fileutils
Package: fileutils
Essential: yes
Status: install ok installed
Priority: required
Section: base
Installed-Size: 1612
Maintainer: Michael Stone <address@hidden>
Version: 4.1-7


cypher:~# df
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hda1              6036144   1278368   4757776  22% /mnt/C
/dev/hdb1             30000512  13929392  16071120  47% /mnt/D

cypher:~# df -a
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hda2              1984272   1496656    386816  80% /
proc                         0         0         0   -  /proc
devpts                       0         0         0   -  /dev/pts
/dev/hda1              6036144   1278368   4757776  22% /mnt/C
none                         0         0         0   -  /proc/bus/usb
/dev/hdb1             30000512  13929392  16071120  47% /mnt/D

cypher:~# df /
Filesystem           1k-blocks      Used Available Use% Mounted on
/dev/hda2              1984272   1496656    386816  80% /


cypher:~# cat /proc/mounts
/dev/root / ext3 rw 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw 0 0
/dev/hda1 /mnt/C vfat rw 0 0
none /proc/bus/usb usbdevfs rw 0 0
/dev/hdb1 /mnt/D vfat rw 0 0

cypher:~# cat /etc/mtab
/dev/hda2 / auto rw,errors=remount-ro,errors=remount-ro 0 0
proc /proc proc rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
/dev/hda1 /mnt/C vfat rw,0 0 0
none /proc/bus/usb usbdevfs rw 0 0
/dev/hdb1 /mnt/D vfat rw 0 0
cypher:~# cat /etc/fstab
# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>
<dump> <pass>
/dev/hda2       /               auto    defaults,errors=remount-ro      0
1/dev/hda3       none            swap    sw                      0       0
proc            /proc           proc    defaults                        0
0/dev/fd0        /floppy         auto    defaults,user,noauto            0
0/dev/cdrom      /cdrom          iso9660 defaults,ro,user,noauto         0
0/dev/burner     /burner         iso9660 defaults,ro,user,noauto         0
/dev/hda1       /mnt/C          vfat                                    0
none  /proc/bus/usb  usbdevfs  defaults  0  0
/dev/hdb1       /mnt/D          vfat

strace of 'df'
execve("/bin/df", ["df"], [/* 16 vars */]) = 0
uname({sys="Linux", node="cypher", ...}) = 0
brk(0)                                  = 0x804f164
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(0x3, 0xbfffef34)                = 0
old_mmap(NULL, 33404, PROT_READ, MAP_PRIVATE, 3, 0) = 0x40016000
close(3)                                = 0
open("/lib/libc.so.6", O_RDONLY)        = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0(\327\1"..., 1024) = 
1024
fstat64(0x3, 0xbfffef7c)                = 0
old_mmap(NULL, 1187968, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x4001f000
mprotect(0x40137000, 41088, PROT_NONE)  = 0
old_mmap(0x40137000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x117000) = 0x40137000
old_mmap(0x4013d000, 16512, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x4013d000
close(3)                                = 0
munmap(0x40016000, 33404)               = 0
brk(0)                                  = 0x804f164
brk(0x804f18c)                          = 0x804f18c
brk(0x8050000)                          = 0x8050000
open("/etc/mtab", O_RDONLY)             = 3
brk(0x8052000)                          = 0x8052000
fstat64(0x3, 0xbffff4dc)                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40016000
read(3, "/dev/hda2 / auto rw,errors=remou"..., 4096) = 223
read(3, "", 4096)                       = 0
close(3)                                = 0
munmap(0x40016000, 4096)                = 0
fstat64(0x1, 0xbffff3cc)                = 0
ioctl(1, TCGETS, {B38400 opost isig icanon echo ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40016000
write(1, "Filesystem           1k-blocks  "..., 67) = 67
statfs("/proc", {f_type="PROC_SUPER_MAGIC", f_bsize=1024, f_blocks=0, 
f_bfree=0, f_files=0, f_ffree=0, f_namelen=255}) = 0
stat64(0x80503a8, 0xbffff7fc)           = 0
open("/proc/mounts", O_RDONLY)          = 3
fstat64(0x3, 0xbfffed1c)                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40017000
read(3, "/dev/root / ext3 rw 0 0\nproc /pr"..., 1024) = 170
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
statfs("/dev/pts", {f_type=0x1cd1, f_bsize=1024, f_blocks=0, f_bfree=0, 
f_files=0, f_ffree=0, f_namelen=255}) = 0
stat64(0x80503f8, 0xbffff7fc)           = 0
open("/proc/mounts", O_RDONLY)          = 3
fstat64(0x3, 0xbfffed1c)                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40017000
read(3, "/dev/root / ext3 rw 0 0\nproc /pr"..., 1024) = 170
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
stat64(0xbffff3eb, 0xbffff384)          = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
statfs("/mnt/C", {f_type="MSDOS_SUPER_MAGIC", f_bsize=4096, f_blocks=1509036, 
f_bfree=1189444, f_files=0, f_ffree=0, f_namelen=260}) = 0
stat64(0x8050448, 0xbffff7fc)           = 0
open("/proc/mounts", O_RDONLY)          = 3
fstat64(0x3, 0xbfffed1c)                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40017000
read(3, "/dev/root / ext3 rw 0 0\nproc /pr"..., 1024) = 170
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
stat64(0xbffff3eb, 0xbffff384)          = 0
stat64(0xbffff3ee, 0xbffff384)          = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
write(1, "/dev/hda1              6036144  "..., 63) = 63
statfs("/proc/bus/usb", {f_type=0x9fa2, f_bsize=1024, f_blocks=0, f_bfree=0, 
f_files=0, f_ffree=0, f_namelen=255}) = 0
stat64(0x8050498, 0xbffff7fc)           = 0
open("/proc/mounts", O_RDONLY)          = 3
fstat64(0x3, 0xbfffed1c)                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40017000
read(3, "/dev/root / ext3 rw 0 0\nproc /pr"..., 1024) = 170
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
stat64(0xbffff3eb, 0xbffff384)          = 0
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
statfs("/mnt/D", {f_type="MSDOS_SUPER_MAGIC", f_bsize=16384, f_blocks=1875032, 
f_bfree=1004445, f_files=0, f_ffree=0, f_namelen=260}) = 0
stat64(0x80504f0, 0xbffff7fc)           = 0
open("/proc/mounts", O_RDONLY)          = 3
fstat64(0x3, 0xbfffed1c)                = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 
0x40017000
read(3, "/dev/root / ext3 rw 0 0\nproc /pr"..., 1024) = 170
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
stat64(0xbffff3eb, 0xbffff384)          = 0
stat64(0xbffff3ee, 0xbffff384)          = 0
stat64(0xbffff3e9, 0xbffff384)          = 0
stat64(0xbffff3ee, 0xbffff384)          = 0
close(3)                                = 0
munmap(0x40017000, 4096)                = 0
write(1, "/dev/hdb1             30000512  "..., 63) = 63
munmap(0x40016000, 4096)                = 0
_exit(0)                                = ?

--
Burton Windle                           address@hidden
Linux: the "grim reaper of innocent orphaned children."
          from /usr/src/linux-2.4.0/init/main.c:655