I don't want to scare people but i've lost my ext4 partition:
r...@ubuntu:~# mount -t ext4dev /dev/sda1 /mnt
mount: wrong fs type, bad option, bad superblock on /dev/sda1,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
r...@ubuntu:~# dmesg | tail -1
[ 4874.514703] VFS: Can't find ext4 filesystem on dev sda1.
r...@ubuntu:~# e2fsck /dev/sda1
e2fsck 1.41.3 (12-Oct-2008)
e2fsck: Superblock invalid, trying backup blocks...
/dev/sda1 was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Error1: Corrupt extent header on inode 107192
Aborted (core dumped)
r...@ubuntu:~# gdb -q --args e2fsck /dev/sda1
(gdb) run
Starting program: /sbin/e2fsck /dev/sda1
[Thread debugging using libthread_db enabled]
e2fsck 1.41.3 (12-Oct-2008)
/sbin/e2fsck: Superblock invalid, trying backup blocks...
/dev/sda1 was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Error1: Corrupt extent header on inode 107192
[New Thread 0xb7e46700 (LWP 12878)]
Program received signal SIGABRT, Aborted.
[Switching to Thread 0xb7e46700 (LWP 12878)]
0xb8031430 in __kernel_vsyscall ()
(gdb) backtrace
#0 0xb8031430 in __kernel_vsyscall ()
#1 0xb7e8c880 in raise () from /lib/tls/i686/cmov/libc.so.6
#2 0xb7e8e248 in abort () from /lib/tls/i686/cmov/libc.so.6
#3 0x0805397b in scan_extent_node (ctx=0x9193038, pctx=0xbf830d7c,
pb=0xbf830c5c, start_block=0, ehandle=0x91b8170) at
/build/buildd/e2fsprogs-1.41.3/e2fsck/pass1.c:1700
#4 0x08054c02 in check_blocks (ctx=0x9193038, pctx=0xbf830d7c,
block_buf=0x91acff0 "\225\"\005") at
/build/buildd/e2fsprogs-1.41.3/e2fsck/pass1.c:1773
#5 0x080565ca in e2fsck_pass1 (ctx=0x9193038) at
/build/buildd/e2fsprogs-1.41.3/e2fsck/pass1.c:1030
#6 0x08050063 in e2fsck_run (ctx=0x9193038) at
/build/buildd/e2fsprogs-1.41.3/e2fsck/e2fsck.c:215
#7 0x0804e4b8 in main (argc=Cannot access memory at address 0x324e
) at /build/buildd/e2fsprogs-1.41.3/e2fsck/unix.c:1278
(gdb)
--
make ext4 as the primary filesystem for GNU/Linux
https://bugs.launchpad.net/bugs/293465
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