Subject: Re: Log structured filesystem
To: None <metamatic!metamatic.denver.co.us!ediger@uucp-1.csn.net>
From: David Brownlee <david@mono.org>
List: port-sparc
Date: 06/30/1996 17:53:09
AFAIR lfs is broken in NetBSD - & looking for someone to work
on it :)
It should be marked as 'still experimental' in the config file.
The man page _really_ should note that its broken, care
to submit a PR on this? :)
.---- I've been too drunk to love ----.--- I've been too drunk to remember -.
| Too drunk to care | The hell of the night before |
| Looked like death, felt like Hell | I've been drinking myself blind |
`------ Been the worse for wear ------'--- And still I'll drink some more --'
On Sun, 30 Jun 1996, Bruce Allen Ediger wrote:
>
>
> I'm running NetBSD 1.1 on a SPARCStation IPC, ROM Rev 2.9. I've tried
> to put an LFS filesystem on a SUN0207 disk (<CONNER, CP30200 SUN0207, 4234>).
>
> I can put the filesystem itself on the 'g' partition of the disk
> using the newlfs command (newlfs -L /dev/rsd1g). From der Mouse's
> sunlabel program, the disk looks like this:
>
> 1:46am 4 # sunlabel /dev/rsd1a /
> sunlabel> p
> a: start cyl = 0, size = 16848 (52/0/0 - 8.22656Mb)
> b: start cyl = 52, size = 178200 (550/0/0 - 87.0117Mb)
> c: start cyl = 0, size = 406296 (1254/0/0 - 198.387Mb)
> d: start cyl = 0, size = 0 (0/0/0 - 0Mb)
> e: start cyl = 0, size = 0 (0/0/0 - 0Mb)
> f: start cyl = 0, size = 0 (0/0/0 - 0Mb)
> g: start cyl = 602, size = 211248 (652/0/0 - 103.148Mb) <=== LFS here
> h: start cyl = 0, size = 0 (0/0/0 - 0Mb)
>
> I can mount the LFS filesystem on /lfs using either a vanilla 'mount' or
> a mount_lfs:
>
> mount_lfs -d -s /dev/sd1g /lfs
>
> It mounts, and I can 'cd' into /lfs and do listings. I can even 'touch'
> and 'rm' files. But if I do a 'cp' or a 'mkdir' and 'cd', the 'cp'
> process hangs. Here's what a 'ps -algxww' says about a zsh shell that
> I used to cd into a newly created directory in /lfs:
>
> 0 144 134 0 -5 0 740 164 biowai D+ p4 0:02.39 (zsh)
>
> Apparently, any process that tries to write bytes to an LFS hangs.
> The lfs_cleanerd just fives messages like this:
>
> Cleaner Not Running at Sun Jun 30 01:51:03 1996
>
> I've tried both the binary distribution kernel, and a kernel I've built
> myself. Both of these have 'options LFS' in the configuration file.
> I get the same hanging in 'D' state on the biowai WCHAN in every process
> that tries to write to the disk.
>
> I've even recompiled the newlfs, lfs_cleanerd and mount_lfs executables,
> with no change in results.
>
> I've put an ffs filesystem on the same disk, and that filesystem seems
> to work, so I'm pretty sure its not the disk hardware that's hosed.
>
> I found Margo Seltzer's January, 1995 usenet article, and the source code
> for LFS that she used. I compared the NetBSD lfs code with hers and found
> a few differences, but nothing more than trivialites (syscallarg and
> SCARG macros, format of credentials struct, timeval field name differences).
>
> What's the scoop? Does LFS work at all? Is there some mystical trick
> I'm missing, like extra options in the config file?
>
> Best regards,
> Bruce Ediger
>