* ext4 lazytime: ctime of some files changed
@ 2015-05-13 9:35 Jörg-Volker Peetz
2015-05-13 16:20 ` Jörg-Volker Peetz
` (2 more replies)
0 siblings, 3 replies; 10+ messages in thread
From: Jörg-Volker Peetz @ 2015-05-13 9:35 UTC (permalink / raw)
To: linux-fsdevel; +Cc: Theodore Ts'o
Dear Ted,
on my laptop with ext4 fs (on SSD) I started to try the lazytime mount option
using a self compiled kernel 4.0.2 on a debian system with mount version 2.26.2.
Before that, I've used the noatime mount option.
After restarting the system with an adapted /etc/fstab file and the kernel
parameter "rootflags=lazytime", the relatime mount option was also set. I
changed that by commanding "mount -o remount,strictatime /", etc.
By accident, I noticed that some files had a modified ctime and mtime although
they were not changed or modified.
Has anybody else experienced that? Do I miss a patch?
Mount options in fstab: nobarrier,lazytime,errors=remount-ro
The filesystems are ext4 on a primary partition of the SSD with default mount
option journal_data_writeback. I created them in Feb 2011.
By the way, the command "mount -o remount,lazytime /" does not do the switch to
lazytime.
And thanks for your tireless work on Linux.
--
Regards,
jvp.
^ permalink raw reply [flat|nested] 10+ messages in thread* Re: ext4 lazytime: ctime of some files changed 2015-05-13 9:35 ext4 lazytime: ctime of some files changed Jörg-Volker Peetz @ 2015-05-13 16:20 ` Jörg-Volker Peetz 2015-05-14 2:17 ` Theodore Ts'o 2015-05-16 14:30 ` Holger Hoffstätte 2 siblings, 0 replies; 10+ messages in thread From: Jörg-Volker Peetz @ 2015-05-13 16:20 UTC (permalink / raw) To: linux-fsdevel Jörg-Volker Peetz wrote on 05/13/2015 11:35: > Dear Ted, > > on my laptop with ext4 fs (on SSD) I started to try the lazytime mount option > using a self compiled kernel 4.0.2 on a debian system with mount version 2.26.2. > Before that, I've used the noatime mount option. > > After restarting the system with an adapted /etc/fstab file and the kernel > parameter "rootflags=lazytime", the relatime mount option was also set. I > changed that by commanding "mount -o remount,strictatime /", etc. > By accident, I noticed that some files had a modified ctime and mtime although > they were not changed or modified. > > Has anybody else experienced that? Do I miss a patch? > > Mount options in fstab: nobarrier,lazytime,errors=remount-ro > The filesystems are ext4 on a primary partition of the SSD with default mount > option journal_data_writeback. I created them in Feb 2011. > > By the way, the command "mount -o remount,lazytime /" does not do the switch to > lazytime. > > And thanks for your tireless work on Linux. > After writing the above, I encountered another accident regarding two files of the emacs24 package of which the mtime got changed. I tried to repair this by using versions of the two files with the correct mtime in the /tmp directory and commanded > touch -r /tmp/debian-ispell.elc /usr/share/emacs24/site-lisp/dictionaries-common/debian-ispell.elc > touch -r /tmp/ess-noweb-font-lock-mode.elc /usr/share/emacs24/site-lisp/ess/ess-noweb-font-lock-mode.elc A few hours later I unpacked and tested a tar archive by commanding s.t. like > tar xf linux-4.0.tar.xz > sync > echo 3 >/proc/sys/vm/drop_caches > tar df linux-4.0.tar.xz Thereafter, the two emacs package files again had a wrong mtime (which by the way shows when I start emacs). Could this be due to the lazytime mount option? -- Regards, jvp. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-13 9:35 ext4 lazytime: ctime of some files changed Jörg-Volker Peetz 2015-05-13 16:20 ` Jörg-Volker Peetz @ 2015-05-14 2:17 ` Theodore Ts'o 2015-05-14 8:27 ` Jörg-Volker Peetz 2015-05-14 8:34 ` Jörg-Volker Peetz 2015-05-16 14:30 ` Holger Hoffstätte 2 siblings, 2 replies; 10+ messages in thread From: Theodore Ts'o @ 2015-05-14 2:17 UTC (permalink / raw) To: Jörg-Volker Peetz; +Cc: linux-fsdevel On Wed, May 13, 2015 at 11:35:31AM +0200, Jörg-Volker Peetz wrote: > > on my laptop with ext4 fs (on SSD) I started to try the lazytime mount option > using a self compiled kernel 4.0.2 on a debian system with mount version 2.26.2. > Before that, I've used the noatime mount option. > > After restarting the system with an adapted /etc/fstab file and the kernel > parameter "rootflags=lazytime", the relatime mount option was also set. I > changed that by commanding "mount -o remount,strictatime /", etc. The lazytime flag is independent of strictatime/relatime/noatime. And the default is relatime. So when you replaced noatime with lazytime, it's not surprising that you saw the relatime mount option being set. > By accident, I noticed that some files had a modified ctime and mtime although > they were not changed or modified. > > Has anybody else experienced that? Do I miss a patch? I haven't seen this myself. > Mount options in fstab: nobarrier,lazytime,errors=remount-ro > The filesystems are ext4 on a primary partition of the SSD with default mount > option journal_data_writeback. I created them in Feb 2011. > > By the way, the command "mount -o remount,lazytime /" does not do the switch to > lazytime. # grep sda3 /proc/mounts /dev/sda3 / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0 # mount -o remount,lazytime / # grep sda3 /proc/mounts /dev/sda3 / ext4 rw,lazytime,relatime,errors=remount-ro,data=ordered 0 0 # uname -a Linux closure 4.1.0-rc2-11633-gef8a5d0 #125 SMP Tue May 5 21:21:08 EDT 2015 x86_64 GNU/Linux - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-14 2:17 ` Theodore Ts'o @ 2015-05-14 8:27 ` Jörg-Volker Peetz 2015-05-14 12:38 ` Theodore Ts'o 2015-05-14 8:34 ` Jörg-Volker Peetz 1 sibling, 1 reply; 10+ messages in thread From: Jörg-Volker Peetz @ 2015-05-14 8:27 UTC (permalink / raw) To: linux-fsdevel Theodore Ts'o wrote on 05/14/2015 04:17: > On Wed, May 13, 2015 at 11:35:31AM +0200, Jörg-Volker Peetz wrote: >> >> By the way, the command "mount -o remount,lazytime /" does not do the switch to >> lazytime. > > > # grep sda3 /proc/mounts > /dev/sda3 / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0 > # mount -o remount,lazytime / > # grep sda3 /proc/mounts > /dev/sda3 / ext4 rw,lazytime,relatime,errors=remount-ro,data=ordered 0 0 > # uname -a > Linux closure 4.1.0-rc2-11633-gef8a5d0 #125 SMP Tue May 5 21:21:08 EDT 2015 x86_64 GNU/Linux # uname -a Linux fehu 4.0.2 #1 SMP Thu May 7 00:09:53 CEST 2015 x86_64 GNU/Linux # grep sda2 /proc/mounts /dev/sda2 /home ext4 rw,noatime,nobarrier,errors=remount-ro 0 0 # mount -o remount,lazytime /home # grep sda2 /proc/mounts /dev/sda2 /home ext4 rw,noatime,nobarrier,errors=remount-ro 0 0 # mount --version mount from util-linux 2.26.2 (libmount 2.26.0: selinux, assert, debug) Also switching to relatime does not work with the mount command. Could it be a problem with the mount package of debian? -- Regards, jvp. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-14 8:27 ` Jörg-Volker Peetz @ 2015-05-14 12:38 ` Theodore Ts'o 2015-05-14 12:58 ` Jörg-Volker Peetz 0 siblings, 1 reply; 10+ messages in thread From: Theodore Ts'o @ 2015-05-14 12:38 UTC (permalink / raw) To: Jörg-Volker Peetz; +Cc: linux-fsdevel On Thu, May 14, 2015 at 10:27:58AM +0200, Jörg-Volker Peetz wrote: > > Also switching to relatime does not work with the mount command. Could it be a > problem with the mount package of debian? I'm using Debian Jessie: ii mount 2.25.2-6 amd64 Tools for mounting and manipulating filesystem The other difference might be what you and I have in our /etc/fstab? I have: LABEL=closure-root / ext4 errors=remount-ro 0 1 Can you also try something like this? # strace -o /tmp/st mount -o remount,nolazytime / # grep ^mount /tmp/st mount("/dev/sda3", "/", 0x1f21250, MS_MGC_VAL|MS_REMOUNT, "errors=remount-ro,lazytime") = 0 Cheers, - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-14 12:38 ` Theodore Ts'o @ 2015-05-14 12:58 ` Jörg-Volker Peetz 2015-05-14 13:09 ` Jörg-Volker Peetz 2015-05-14 17:58 ` Jörg-Volker Peetz 0 siblings, 2 replies; 10+ messages in thread From: Jörg-Volker Peetz @ 2015-05-14 12:58 UTC (permalink / raw) To: linux-fsdevel; +Cc: Theodore Ts'o Theodore Ts'o wrote on 05/14/2015 14:38: > On Thu, May 14, 2015 at 10:27:58AM +0200, Jörg-Volker Peetz wrote: >> >> Also switching to relatime does not work with the mount command. Could it be a >> problem with the mount package of debian? > > I'm using Debian Jessie: > I'm using a mixture of testing and sid with mount, util-linux, etc. version 2.26.2-2. > ii mount 2.25.2-6 amd64 Tools for mounting and manipulating filesystem > > The other difference might be what you and I have in our /etc/fstab? > I have: > > LABEL=closure-root / ext4 errors=remount-ro 0 1 > Here: UUID=7e13aca5-... / ext4 nobarrier,noatime,errors=remount-ro 0 2 > Can you also try something like this? > > # strace -o /tmp/st mount -o remount,nolazytime / > # grep ^mount /tmp/st > mount("/dev/sda3", "/", 0x1f21250, MS_MGC_VAL|MS_REMOUNT, "errors=remount-ro,lazytime") = 0 > mount("/dev/sda1", "/", 0x1488780, MS_MGC_VAL|MS_REMOUNT|MS_NOATIME, "nobarrier,errors=remount-ro") = 0 > Cheers, > > - Ted Thank you for your support. -- Jörg. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-14 12:58 ` Jörg-Volker Peetz @ 2015-05-14 13:09 ` Jörg-Volker Peetz 2015-05-14 17:58 ` Jörg-Volker Peetz 1 sibling, 0 replies; 10+ messages in thread From: Jörg-Volker Peetz @ 2015-05-14 13:09 UTC (permalink / raw) To: linux-fsdevel; +Cc: Theodore Ts'o Jörg-Volker Peetz wrote on 05/14/2015 14:58: > Theodore Ts'o wrote on 05/14/2015 14:38: >> On Thu, May 14, 2015 at 10:27:58AM +0200, Jörg-Volker Peetz wrote: >>> >>> Also switching to relatime does not work with the mount command. Could it be a >>> problem with the mount package of debian? >> >> I'm using Debian Jessie: >> > I'm using a mixture of testing and sid with mount, util-linux, etc. version > 2.26.2-2. > >> ii mount 2.25.2-6 amd64 Tools for mounting and manipulating filesystem >> >> The other difference might be what you and I have in our /etc/fstab? >> I have: >> >> LABEL=closure-root / ext4 errors=remount-ro 0 1 >> > Here: > UUID=7e13aca5-... / ext4 nobarrier,noatime,errors=remount-ro 0 2 > Typo here, is actually UUID=7e13aca5-... / ext4 nobarrier,noatime,errors=remount-ro 0 1 >> Can you also try something like this? >> >> # strace -o /tmp/st mount -o remount,nolazytime / >> # grep ^mount /tmp/st >> mount("/dev/sda3", "/", 0x1f21250, MS_MGC_VAL|MS_REMOUNT, "errors=remount-ro,lazytime") = 0 >> > mount("/dev/sda1", "/", 0x1488780, MS_MGC_VAL|MS_REMOUNT|MS_NOATIME, > "nobarrier,errors=remount-ro") = 0 > >> Cheers, >> >> - Ted > Thank you for your support. > -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-14 12:58 ` Jörg-Volker Peetz 2015-05-14 13:09 ` Jörg-Volker Peetz @ 2015-05-14 17:58 ` Jörg-Volker Peetz 1 sibling, 0 replies; 10+ messages in thread From: Jörg-Volker Peetz @ 2015-05-14 17:58 UTC (permalink / raw) To: linux-fsdevel; +Cc: Theodore Ts'o Jörg-Volker Peetz wrote on 05/14/2015 14:58: > Theodore Ts'o wrote on 05/14/2015 14:38: >> On Thu, May 14, 2015 at 10:27:58AM +0200, Jörg-Volker Peetz wrote: >>> >>> Also switching to relatime does not work with the mount command. Could it be a >>> problem with the mount package of debian? >> >> I'm using Debian Jessie: >> > I'm using a mixture of testing and sid with mount, util-linux, etc. version > 2.26.2-2. > >> ii mount 2.25.2-6 amd64 Tools for mounting and manipulating filesystem >> >> The other difference might be what you and I have in our /etc/fstab? >> I have: >> >> LABEL=closure-root / ext4 errors=remount-ro 0 1 >> > Here: > UUID=7e13aca5-... / ext4 nobarrier,noatime,errors=remount-ro 0 2 > >> Can you also try something like this? >> >> # strace -o /tmp/st mount -o remount,nolazytime / >> # grep ^mount /tmp/st >> mount("/dev/sda3", "/", 0x1f21250, MS_MGC_VAL|MS_REMOUNT, "errors=remount-ro,lazytime") = 0 >> > mount("/dev/sda1", "/", 0x1488780, MS_MGC_VAL|MS_REMOUNT|MS_NOATIME, > "nobarrier,errors=remount-ro") = 0 > After re-reading it again, I should clarify that I meanwhile rebooted with noatime. Maybe then, it is more helpful to show the output of # strace -o /tmp/st mount -o remount,lazytime / # grep ^mount /tmp/st mount("/dev/sda1", "/", 0x10a0780, MS_REMOUNT|MS_NOATIME|0x2000000, "nobarrier,errors=remount-ro") = 0 -- Regards, Jörg. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-14 2:17 ` Theodore Ts'o 2015-05-14 8:27 ` Jörg-Volker Peetz @ 2015-05-14 8:34 ` Jörg-Volker Peetz 1 sibling, 0 replies; 10+ messages in thread From: Jörg-Volker Peetz @ 2015-05-14 8:34 UTC (permalink / raw) To: linux-fsdevel; +Cc: Theodore Ts'o [forgot to Cc to you] Theodore Ts'o wrote on 05/14/2015 04:17: > On Wed, May 13, 2015 at 11:35:31AM +0200, Jörg-Volker Peetz wrote: >> >> By the way, the command "mount -o remount,lazytime /" does not do the switch to >> lazytime. > > > # grep sda3 /proc/mounts > /dev/sda3 / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0 > # mount -o remount,lazytime / > # grep sda3 /proc/mounts > /dev/sda3 / ext4 rw,lazytime,relatime,errors=remount-ro,data=ordered 0 0 > # uname -a > Linux closure 4.1.0-rc2-11633-gef8a5d0 #125 SMP Tue May 5 21:21:08 EDT 2015 x86_64 GNU/Linux # uname -a Linux fehu 4.0.2 #1 SMP Thu May 7 00:09:53 CEST 2015 x86_64 GNU/Linux # grep sda2 /proc/mounts /dev/sda2 /home ext4 rw,noatime,nobarrier,errors=remount-ro 0 0 # mount -o remount,lazytime /home # grep sda2 /proc/mounts /dev/sda2 /home ext4 rw,noatime,nobarrier,errors=remount-ro 0 0 # mount --version mount from util-linux 2.26.2 (libmount 2.26.0: selinux, assert, debug) Also switching to relatime does not work with the mount command. Could it be a problem with the mount package of debian? -- Regards, jvp. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
* Re: ext4 lazytime: ctime of some files changed 2015-05-13 9:35 ext4 lazytime: ctime of some files changed Jörg-Volker Peetz 2015-05-13 16:20 ` Jörg-Volker Peetz 2015-05-14 2:17 ` Theodore Ts'o @ 2015-05-16 14:30 ` Holger Hoffstätte 2 siblings, 0 replies; 10+ messages in thread From: Holger Hoffstätte @ 2015-05-16 14:30 UTC (permalink / raw) To: linux-fsdevel On Wed, 13 May 2015 11:35:31 +0200, Jörg-Volker Peetz wrote: > By the way, the command "mount -o remount,lazytime /" does not do the switch to > lazytime. Had the same problem, found the regression: http://article.gmane.org/gmane.comp.file-systems.ext4/48663 Solution: downgrade to util-linux-2.25.2. cheers Holger -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 10+ messages in thread
end of thread, other threads:[~2015-05-16 14:35 UTC | newest] Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2015-05-13 9:35 ext4 lazytime: ctime of some files changed Jörg-Volker Peetz 2015-05-13 16:20 ` Jörg-Volker Peetz 2015-05-14 2:17 ` Theodore Ts'o 2015-05-14 8:27 ` Jörg-Volker Peetz 2015-05-14 12:38 ` Theodore Ts'o 2015-05-14 12:58 ` Jörg-Volker Peetz 2015-05-14 13:09 ` Jörg-Volker Peetz 2015-05-14 17:58 ` Jörg-Volker Peetz 2015-05-14 8:34 ` Jörg-Volker Peetz 2015-05-16 14:30 ` Holger Hoffstätte
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