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Re: Differences in mkfs.xfs and xfs_info output.

To: David Chinner <dgc@xxxxxxx>
Subject: Re: Differences in mkfs.xfs and xfs_info output.
From: Jan Derfinak <ja@xxxxxxxxxxxx>
Date: Mon, 18 Feb 2008 01:12:18 +0100 (CET)
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20080217230645.GY155407@xxxxxxx>
References: <Pine.LNX.4.63.0802160149590.4592@xxxxxxxxxxxxxxxxxx> <20080216074019.GV155407@xxxxxxx> <Pine.LNX.4.63.0802162319300.6528@xxxxxxxxxxxxxxxxxx> <20080217230645.GY155407@xxxxxxx>
Sender: xfs-bounce@xxxxxxxxxxx
On Mon, 18 Feb 2008, David Chinner wrote:

> Is this reproducable with simple tests? e.g. mkfs, mount, unmount
> check? or doing some simple things like creating some files

mkfs, mount, xfsrestore, umount is 100% reproducable. I restored 5 different
filesystems, some of them several times.

Other tests (all show bug on first try):
# /root/mkfs.xfs -f /dev/loop0
meta-data=/dev/loop0             isize=256    agcount=4, agsize=64000 blks
         =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=256000, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096  
log      =internal log           bsize=4096   blocks=1200, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
# mount /dev/loop0 /mnt/usb
# cp -a /mnt/mnt/xfs/xfs-cmds /mnt/usb  (xfs-cmds is CVS repository)
# umount /mnt/usb
# xfs_check /dev/loop0 
sb_fdblocks 248626, counted 249650

# /root/mkfs.xfs -f /dev/loop0
meta-data=/dev/loop0             isize=256    agcount=4, agsize=64000 blks
         =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=256000, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096  
log      =internal log           bsize=4096   blocks=1200, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
# mount /dev/loop0 /mnt/usb
# cd /mnt/usb
# foreach i ( `seq 1 100` )
foreach? echo 123456789 > $i
foreach? end
# cd
# umount /mnt/usb
# xfs_check /dev/loop0
sb_fdblocks 253651, counted 254675

(added removing files)
# /root/mkfs.xfs -f /dev/loop0
meta-data=/dev/loop0             isize=256    agcount=4, agsize=64000 blks
         =                       sectsz=512   attr=2
data     =                       bsize=4096   blocks=256000, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096  
log      =internal log           bsize=4096   blocks=1200, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
# mount /dev/loop0 /mnt/usb
# cd /mnt/usb
# foreach i ( `seq 1 100` )
foreach? echo 123456789 > $i
foreach? end
# foreach i ( `seq 1 2 100` )
foreach? rm -f $i
foreach? end
# cd
# umount /mnt/usb
# xfs_check /dev/loop0
sb_fdblocks 253701, counted 254725

(test if mount fixes fdblocks information)
# mount /dev/loop0 /mnt/usb
# umount /mnt/usb
# xfs_check /dev/loop0
sb_fdblocks 252677, counted 254725
# mount /dev/loop0 /mnt/usb
# umount /mnt/usb
# xfs_check /dev/loop0
sb_fdblocks 251653, counted 254725
# mount /dev/loop0 /mnt/usb
# umount /mnt/usb
# xfs_check /dev/loop0
sb_fdblocks 250629, counted 254725

mount, umount sequence changes sb_fdblocks without any activity on filesystem,
after every run is sb_fdblocks different (less than previous) but not correct.

# mount -V
mount (util-linux-ng 2.13-rc2)

fdblocks on fresh mkfs-ed filesystem is:
fdblocks = 254780

Should I do any specific test?

> with dd and rm'ing a subset of the files before unmounting?
> I've run some simple tests this morning that do this, and I
> don't see any issues. I'd like to confirm that simple cases

Did you use x86_64 and latest CVS kernel?

Cheers,

jan

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