XFS ignores all atime related mount options, noatime is always in effect, documentation misses this information
On my linux box I tried to achieve regular atime behaviour, tried mount with no atime related option at all, tried mount options atime, sync, osyncisosync, .. XFS on plain partitions, on loop devices .. I tried another kernel (sidux image with kernel 2.6.25-9) ..
My result:
It seems impossible to switch off "noatime" mount option.
atime updates happen only in core, never on disk unless coinciding with other inode modifications, regardless of specified mount options.
$ uname -a Linux roland 2.6.23.12roland2 #2 Tue Apr 15 17:10:52 CEST 2008 i686 GNU/Linux
$ zgrep XFS /proc/config.gz CONFIG_XFS_FS=m # CONFIG_XFS_QUOTA is not set CONFIG_XFS_SECURITY=y CONFIG_XFS_POSIX_ACL=y CONFIG_XFS_RT=y # CONFIG_VXFS_FS is not set
In mailing list archive I found
http://oss.sgi.com/archives/xfs/2007-10/msg00168.html
It seems, that 3 years ago an unconditional noatime enforcement has been introduced.
(1) If this is true, please update documentation accordingly. Users, who need a filesystem with regular atime behaviour, will no more waste their time to try XFS, when in fact it is unusable for their particular requirements.
(2) If I missed a possibility to achieve regular atime behaviour, please document it in Documentation/filesystems/xfs.txt and in man 8 mount.
Thanks!
Signature · 6 lines
Roland Eggner _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs
Am Donnerstag 18 Dezember 2008 schrieb Roland Eggner:
Quoted 5 lines
On my linux box I tried to achieve regular atime behaviour, tried mount with no atime related option at all, tried mount options atime, sync, osyncisosync, .. XFS on plain partitions, on loop devices .. I tried another kernel (sidux image with kernel 2.6.25-9) ..
Quoted 8 lines
My result:
It seems impossible to switch off "noatime" mount option. atime updates happen only in core, never on disk unless coinciding with other inode modifications, regardless of specified mount options.$ uname -a Linux roland 2.6.23.12roland2 #2 Tue Apr 15 17:10:52 CEST 2008 i686 GNU/Linux
I can't reproduce this on 2.6.27.7:
martin@shambhala:~/Zeit> grep /home /proc/mounts/dev/sda5 /home xfs rw,relatime,attr2,nobarrier,logbufs=8,logbsize=256k,noquota 0 0 martin@shambhala:~/Zeit> echo "hallo" >hallo.txt martin@shambhala:~/Zeit> ls -l --time=atime hallo.txt -rw-r--r-- 1 martin martin 6 19. Dez 13:56 hallo.txt martin@shambhala:~/Zeit> cat hallo.txt ; ls -l --time=atime hallo.txt hallo
-rw-r--r-- 1 martin martin 6 19. Dez 13:57 hallo.txt
How did you test it? A reproducable test case would be fine.
Quoted 7 lines
$ zgrep XFS /proc/config.gz CONFIG_XFS_FS=m # CONFIG_XFS_QUOTA is not set CONFIG_XFS_SECURITY=y CONFIG_XFS_POSIX_ACL=y CONFIG_XFS_RT=y # CONFIG_VXFS_FS is not set
martin@shambhala:~> zgrep XFS /proc/config.gzCONFIG_XFS_FS=yCONFIG_XFS_QUOTA=yCONFIG_XFS_POSIX_ACL=yCONFIG_XFS_RT=y
# CONFIG_XFS_DEBUG is not set
# CONFIG_VXFS_FS is not set
Quoted 4 lines
In mailing list archive I found
http://oss.sgi.com/archives/xfs/2007-10/msg00168.html
It seems, that 3 years ago an unconditional noatime enforcement has been introduced.
Did you look within the same mount or did you unmount and remount first? I remember there has been some issue with inode updates and unmounting, but I do not remember the details.
Quoted 3 lines
(2) If I missed a possibility to achieve regular atime behaviour, please document it in
Documentation/filesystems/xfs.txtand in man 8 mount.
Its either atime, relatime or noatime as mount option.
Ciao,
Signature · 7 lines
Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 _______________________________________________ xfs mailing list [email protected] http://oss.sgi.com/mailman/listinfo/xfs