From: Denis Vlasenko <vda@ilport.com.ua>
To: Chris Mason <mason@suse.com>
Subject: Re: Recursive chmod/chown OOM kills box with 32MB RAM
Date: Wed, 1 Feb 2006 12:15:54 +0200
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Cc: Hans Reiser <reiser@namesys.com>, linux-kernel@vger.kernel.org,
       Reiserfs developers mail-list <Reiserfs-Dev@namesys.com>
References: <200601281613.16199.vda@ilport.com.ua> <200601300822.47821.mason@suse.com> <200602010942.36134.vda@ilport.com.ua>
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On Wednesday 01 February 2006 09:42, Denis Vlasenko wrote:
> On Monday 30 January 2006 15:22, Chris Mason wrote:
> > You can shrink the log of an existing filesystem.  The minimum size is 513 
> > blocks, you might try 1024 as a good starting poing.
> > 
> > reiserfstune -s 1024 /dev/xxxx
> > 
> > The filesystem must be unmounted first.
> 
> It doesn't want to, for no obvious reason:
> 
> # mount
> rootfs on / type rootfs (rw)
> /dev/root on / type ext2 (ro,nogrpid)
> none on /proc type proc (rw,nodiratime)
> none on /sys type sysfs (rw)
> none on /dev type ramfs (rw)
> /dev/sda2 on /.share type ext2 (rw,noatime,nogrpid)
> /dev/sdb2 on /.1 type reiserfs (rw,noatime)
> /dev/sdc2 on /.2 type reiserfs (rw,noatime)
> /dev/sdc3 on /.3 type reiserfs (rw,noatime)
> /dev/sda2 on /.local type ext2 (rw,noatime,nogrpid)
> none on /dev/pts type devpts (rw)
> automount(pid1043) on /.local/mnt/auto type autofs (rw)
> # umount /.3
> umount: /.3: device is busy
> # mount -o ro,remount /.3
> # umount /.3
> umount: /.3: device is busy
> # reiserfstune /dev/sdc3
> reiserfstune: Reiserfstune is not allowed to be run on mounted filesystem.
> # lsof -nP | grep -F '/.3'
> # lsof -nP | grep -F '/dev/sdc'

Removed it from /etc/fstab, after reboot:

# reiserfstune -s 1024 /dev/sdc3
reiserfstune: Journal device has not been specified. Assuming journal is on the main device (/dev/sdc3).

Current parameters:

Filesystem state: consistent

Reiserfs super block in block 16 on 0x823 of format 3.6 with standard journal
Count of blocks on the device: 2094474
Number of bitmaps: 64
Blocksize: 4096
Free blocks (count of blocks - used [journal, bitmaps, data, reserved] blocks): 1019710
Root block: 32941
Filesystem is cleanly umounted
Tree height: 4
Hash function used to sort names: "r5"
Objectid map size 54, max 972
Journal parameters:
        Device [0x0]
        Magic [0x2cac04df]
        Size 8193 blocks (including 1 for journal header) (first block 18)
        Max transaction length 1024 blocks
        Max batch size 900 blocks
        Max commit age 30
Blocks reserved by journal: 0
Fs state field: 0x0:
sb_version: 2
inode generation number: 293892
UUID: 7b3aa1ab-40bd-44da-98dc-b37b21f7add0
LABEL:
Set flags in SB:
        ATTRIBUTES CLEAN
reiserfstune: Current journal parameters:
        Device [0x0]
        Magic [0x2cac04df]
        Size 8193 blocks (including 1 for journal header) (first block 18)
        Max transaction length 1024 blocks
        Max batch size 900 blocks
        Max commit age 30
WARNING: wrong transaction max size (1024). Changed to 511
reiserfstune: New journal parameters:
        Device [0x0]
        Magic [0x70dbc903]
        Size 1024 blocks (including 1 for journal header) (first block 18)
        Max transaction length 511 blocks
        Max batch size 449 blocks
        Max commit age 30
Reiserfs super block in block 16 on 0x823 of format 3.6 with non-standard journal
Count of blocks on the device: 2094474
Number of bitmaps: 64
Blocksize: 4096
Free blocks (count of blocks - used [journal, bitmaps, data, reserved] blocks): 1019710
Root block: 32941
Filesystem is cleanly umounted
Tree height: 4
Hash function used to sort names: "r5"
Objectid map size 54, max 972
Journal parameters:
        Device [0x0]
        Magic [0x70dbc903]
        Size 1024 blocks (including 1 for journal header) (first block 18)
        Max transaction length 511 blocks
        Max batch size 449 blocks
        Max commit age 30
Blocks reserved by journal: 8193
Fs state field: 0x0:
sb_version: 2
inode generation number: 293892
UUID: 7b3aa1ab-40bd-44da-98dc-b37b21f7add0
LABEL:
Set flags in SB:
        ATTRIBUTES CLEAN
reiserfstune: ATTENTION: YOU ARE ABOUT TO SETUP THE NEW JOURNAL FOR THE "/dev/sdc3"!
AREA OF "/dev/sdc3" DEDICATED FOR JOURNAL WILL BE ZEROED!
Continue (y/n):y
Initializing journal - 0%....20%....40%....60%....80%....100%
Syncing..ok

# mount /dev/sdc3 /.3 -o noatime
mount: you must specify the filesystem type

# dmesg | tail -4
br: topology change detected, propagating
br: port 1(ifi) entering forwarding state
FAT: bogus number of reserved sectors
VFS: Can't find a valid FAT filesystem on dev sdc3.

# reiserfsck /dev/sdc3
reiserfsck 3.6.11 (2003 www.namesys.com)

*************************************************************
** If you are using the latest reiserfsprogs and  it fails **
** please  email bug reports to reiserfs-list@namesys.com, **
** providing  as  much  information  as  possible --  your **
** hardware,  kernel,  patches,  settings,  all reiserfsck **
** messages  (including version),  the reiserfsck logfile, **
** check  the  syslog file  for  any  related information. **
** If you would like advice on using this program, support **
** is available  for $25 at  www.namesys.com/support.html. **
*************************************************************

Will read-only check consistency of the filesystem on /dev/sdc3
Will put log info to 'stdout'

Do you want to run this program?[N/Yes] (note need to type Yes if you do):Yes
Failed to open the journal device ((null)).

	Wow... 8(
--
vda
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