tmpfs

From: ADAM Sulmicki (adam@cfar.umd.edu)
Date: Sat Feb 19 2000 - 16:06:53 EST

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    Hello,
            Solaris has something called tmpfs. Some ppl wanted it under
            linux.

            An easy way to do is create ramdisk and then just mount it
            as /tmp. It comes out especially handy if you boot whole
            system in readonly mode and some programs require writable
            tmp (like X for its pipes).

            I used to do something like

                    mke2fs -vm0 /dev/ram 2048
                    mount /dev/ram /tmp

            and it used to work like charm. However, unfortunatelly, it
            does not work for me anymore :( Any idea what changed?

    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------
    [root@pepsi adam]# /sbin/mke2fs -vm0 /dev/ram 2048
    mke2fs 1.17, 26-Oct-1999 for EXT2 FS 0.5b, 95/08/09
    Filesystem label=
    OS type: Linux
    Block size=1024 (log=0)
    Fragment size=1024 (log=0)
    256 inodes, 2048 blocks
    0 blocks (0.00%) reserved for the super user
    First data block=1
    1 block group
    8192 blocks per group, 8192 fragments per group
    256 inodes per group

    Writing inode tables: done
    Writing superblocks and filesystem accounting information: done

    [root@pepsi adam]# mount /dev/ram /mnt2 -t ext2
    mount: wrong fs type, bad option, bad superblock on /dev/ram,
           or too many mounted file systems

    [relevant part of dmesg]
    MSDOS: Hardware sector size is 1024
    fatfs: bogus cluster size
    VFS: Can't find a valid MSDOS filesystem on dev 01:01.
    VFS: Can't find an ext2 filesystem on dev ramdisk(1,1).
    ----------------------------------------------------------------------------
    ----------------------------------------------------------------------------
    [root@pepsi adam]# /sbin/mke2fs -V
    mke2fs 1.17, 26-Oct-1999 for EXT2 FS 0.5b, 95/08/09
            Using EXT2FS Library version 1.17
    [root@pepsi adam]# mount -V
    mount: mount-2.9u
    [root@pepsi adam]# uname -a
    Linux pepsi 2.3.42 #240 SMP Tue Feb 1 18:57:15 EST 2000 i686 unknown
    [root@pepsi adam]# cat /proc/filesystems
            ext2
    nodev proc
    nodev nfs
            iso9660
    nodev devpts
            vfat
    [root@pepsi adam]#

    ----------------------------------------------------------------------------
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