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Re: M700-10 problems..

Subject: Re: M700-10 problems..
From: (Tor Arntsen)
Date: Tue, 19 Mar 1996 12:24:10 +0100
In-reply-to: Warner Losh <> "Re: M700-10 problems.." (Mar 19, 11:43)
On Mar 19, 11:43, Warner Losh wrote:
>: VFS: Mounted root (ext2 filesystem) readonly.
>: EXT2-fs error (device 02:00): ext2_find_entry: bad entry in directory #12:
>:  rec_len is smaller than minimal - offset=40, inode=0, rec_len=0, name_len=0
>Same problem here (except mine was due to the fs code thinking the
>directory spanned multiple blocks).  I've discovered so far that
>either the same data is transferred twice, or that the second trafer
>doesn't happen, even though the kernel thinks that it happened.  I've
>not had the time to go in and figure out the exact reasons for this.
>I do know that the kernel will checksum the blocks to the same thing
>(well, I added that code).  Are you using a 720k floppy, or a 1.4M
>job?  I'm using a 1.4M that I created from scratch on my FreeBSD
>system, but that mounts and seems to work correctly from the Linux
>1.1.59 system that I have laying around on another partition of my

I'm using a 1.44MB floppy disk drive, and I tried both a self-made
(on Linux/x86) ext2fs 1.44MB file system, and the rhello-720k.image 
(just cat'ed to a formatted 1.44MB floppy).  Same problem on both.  From
what I can find out using debugfs it looks like the 'directory #' (which is
different for my two floppies) in both cases points to the /dev directory on 
the floppy file systems -- given that I interpret the debugfs 'ls' output 
correctly of course..  I'm not sure what Linux tries to read first from a 
root mounted file system, for all I know the /dev directory will always be 
the first one?   If it really finds the /dev directory then the problem seems 
to be limited to reading the entries in the directory, not total corruption.
But this is pure speculation, I should look more into this.  I have limited 
time available at the moment, unfortunately.


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