The mount -o remount,ro call does indeed not succeed.
Essentially, the test ended up looking like this:
fsck /ro (no errors)
mount -o remount,rw /ro
rsync stuff into /ro
mount -o remount,ro /ro (this fails, /ro is still mounted as rw)
fsck /ro (errors)
During testing, I was able to determine that this is likely pointing us in
the right direction. I tried a similar set of commands on a test system with
aufs removed. In this system, the root is simply mounted read-only, and has
some tmpfs directories mounted over certain areas to allow the system to
write, I used a mount --bind to then ensure the rsync copies get put into
the correct place. For simplicity, I used /ro as the bind location.
fsck / (no errors)
mount -o remount,rw /
mount --bind / /ro
rsync things into /ro
fsck / (errors are reported)
mount -o remount,ro / (succeeds, where the aufs version does not)
fsck / (errors are no longer reported)
So the difference would appear to be the remount command's failure.
On Thu, Aug 7, 2014 at 8:06 PM, <[1]sf...@users.sourceforge.net> wrote:
Jacob Burkamper:
> The fsck results are rather predictable, before the rsync there are not
any
> errors. After the rsync there are errors.
Let me make sure.
- your test script does
 fsck /ro
 mount -o remount,rw /ro
 rsync something to /ro
 mount -o remount,ro /ro
 fsck /ro
- first fsck doesn't report any error, but second fsck reports the
 error.
If so, did "remount,ro" really succeed? No error messages and you can
confirm /ro is readonly via /proc/mounts?
And your /sys/fs/aufs/si_*/xi_path shows "/rw/.aufs.xino"?
J. R. Okajima
--
Jacob Burkamper
CIPAFilter Development
Email:Â [2]jac...@cipafilter.com
----------------------
CIPAFilter Beta Program
Email: [3]b...@cipafilter.com
Web:Â Â Â Â Â [4]http://www.cipafilter.com
References
1. mailto:sf...@users.sourceforge.net
2. mailto:jac...@cipafilter.com
3. mailto:b...@cipafilter.com
4. http://www.cipafilter.com/
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