Bug 756670

Summary: mount: norelatime is being ignored
Product: [Fedora] Fedora Reporter: Need Real Name <lsof>
Component: util-linuxAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 16CC: gansalmon, itamar, jonathan, kernel-maint, kzak, lsof, madhu.chinakonda
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Hardware: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2011-11-24 11:50:05 UTC Type: ---
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Need Real Name 2011-11-24 08:32:08 UTC 
# mount |grep /boot
/dev/sda1 on /boot type ext3 (rw,relatime,seclabel,user_xattr,barrier=1,nodelalloc,data=ordered)

# mount /dev/sda1 /boot/ -onorelatime,remount

# mount |grep /boot
/dev/sda1 on /boot type ext3 (rw,relatime,seclabel,user_xattr,barrier=1,nodelalloc,data=ordered)

The same happens if I don't use remount. The same happens if I specify norelatime instead of defaults in /etc/fstab.

There is no way not to use norelatime.
Comment 1 Karel Zak 2011-11-24 11:50:05 UTC 
Did you read mount(8) man page?

# findmnt /boot
TARGET SOURCE    FSTYPE OPTIONS
/boot  /dev/sda1 ext4   rw,relatime,user_xattr,barrier=1,data=ordered

# mount -o remount,strictatime /boot

# findmnt /boot
TARGET SOURCE    FSTYPE OPTIONS
/boot  /dev/sda1 ext4   rw,user_xattr,barrier=1,data=ordered


The 'norealatime' only removes MS_RELATIME from the syscall mount(2) flags, so kernel will follow the default -- the default is realatime :-) You have to use strictatime to overwrite the default and enable full atime updates.
Comment 2 Need Real Name 2011-11-27 19:58:43 UTC 
This seems a little counter-intuitive.

So when I explicitly state the opposite of a mount option, I don't get it?

Should this also fail because rw is default?
mount -o remount,ro