2.4.7 tmpfs strange behaviour

From: J . A . Magallon (jamagallon@able.es)
Date: Tue Jul 24 2001 - 17:59:40 EST

Hi.

I have notice some strange behaviour for tmpfs/shmfs. It seems to define the
device somehow related to the cwd where the mount command is issued.
I will explain. This is the relevant part of my /etc/fstab:

tmpfs /dev/shm tmpfs defaults,size=128M 0 0

And now I try to mount it:

werewolf:~# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda1 248895 79908 156137 34% /
/dev/sda2 3099292 2080088 861768 71% /usr
/dev/sda3 4095488 1591936 2295512 41% /home
/dev/sda5 1027768 4 975556 1% /toast
/dev/sdb1 4232960 32840 4200120 1% /mnt/disk
werewolf:~# mount -a -t tmpfs
werewolf:~# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda1 248895 79908 156137 34% /
/dev/sda2 3099292 2080088 861768 71% /usr
/dev/sda3 4095488 1591936 2295512 41% /home
/dev/sda5 1027768 4 975556 1% /toast
/dev/sdb1 4232960 32840 4200120 1% /mnt/disk
/root/tmpfs 131072 0 131072 0% /dev/shm
werewolf:~# cd /tmp
werewolf:/tmp# mount -a -t tmpfs
werewolf:/tmp# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/sda1 248895 79908 156137 34% /
/dev/sda2 3099292 2080088 861768 71% /usr
/dev/sda3 4095488 1591936 2295512 41% /home
/dev/sda5 1027768 4 975556 1% /toast
/dev/sdb1 4232960 32840 4200120 1% /mnt/disk
/root/tmpfs 131072 0 131072 0% /dev/shm
/tmp/tmpfs 131072 0 131072 0% /dev/shm

???? Strange devices.... both mounted under /dev/shm.

BTW, look at /etc/mtab:
werewolf:/tmp# cat /etc/mtab
/dev/sda1 / ext2 rw 0 0
/procfs /proc proc rw 0 0
^
devpts /dev/pts devpts rw,mode=0620 0 0
/dev/sda2 /usr ext2 rw 0 0
/dev/sda3 /home ext2 rw 0 0
/dev/sda5 /toast ext2 rw 0 0
/dev/sdb1 /mnt/disk reiserfs rw 0 0
/root/tmpfs /dev/shm tmpfs rw,size=128M 0 0
^^^^^^^^^^^
/tmp/tmpfs /dev/shm tmpfs rw,size=128M 0 0
^^^^^^^^^^

Why devpts is just plain 'devpts', and procfs is '/procfs' ??? Some bug
that generates device name with cwd for all special filesystems but devpts ?

Kernel or mount bug ?

TIA 

--
J.A. Magallon                           #  Let the source be with you...        
mailto:jamagallon@able.es
Mandrake Linux release 8.1 (Cooker) for i586
Linux werewolf 2.4.7 #1 SMP Mon Jul 23 01:55:36 CEST 2001 i686
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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:20 EST