Andries,
Thanks for the update. So, what do I do now? Wait for a fix for 2.2? Send
my problem report to someone else? Let me know.
Mark Post
-----Original Message-----
From: Andries.Brouwer@cwi.nl [mailto:Andries.Brouwer@cwi.nl]
Sent: Friday, April 12, 2002 4:41 PM
To: Andries.Brouwer@cwi.nl; linux-kernel@vger.kernel.org;
mark.post@eds.com
Cc: alan@lxorguk.ukuu.org.uk
Subject: Re: PROBLEM: kernel mount of initrd fails unless mke2fs uses
1024 byt e blocks
From: "Post, Mark K" <mark.post@eds.com>
[1.] One line summary of the problem:
Trying to use an initrd for an installation fails unless the
mke2fs
used a blocksize of 1024 bytes.
[2.] Full description of the problem/report:
I'm trying to create a Linux for S/390 version 2.2.20
installation
kernel/ramdisk set. When I create the ramdisk, if I issue the
mke2fs
command with -b 2048 or -b 4096, it works fine. But, I try to boot
the
system, I get an "EXT2-fs: Magic mismatch, very weird !" error when
the
kernel tries to mount the ramdisk as the root file system. If I let
the
blocksize default, or specify -b 1024, everything works fine.
The comparison that seems to be failing is at line 500 of
linux/fs/ext/super.c:
if (es->s_magic != le16_to_cpu(EXT2_SUPER_MAGIC)) {
printk ("EXT2-fs: Magic mismatch, very weird
!\n");
goto failed_mount;
I answered:
I once submitted a patch for this, but apparently it is not in 2.2.20.
but was too hasty.
I recalled a buglet here, that was fixed in 2.4 and is still in 2.2,
and indeed, there is such a buglet, but your problem is elsewhere.
The kernel does set_blocksize() to change the blocksize of your
device. This set_blocksize() throws away all buffers with the
now incorrect size. But your device is a ramdisk, and throwing
out these buffers kills all your data.
So, after doing that, you have an empty ramdisk again.
Hence mount fails.
Andries
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This archive was generated by hypermail 2b29 : Mon Apr 15 2002 - 22:00:21 EST