1f36f774b22a0ceb7dd33eca626746c81a97b6a5 is the first bad commit
commit 1f36f774b22a0ceb7dd33eca626746c81a97b6a5
Author: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Sat Dec 26 10:56:19 2009 -0500
Switch !O_CREAT case to use of do_last()
... and now we have all intents crap well localized
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
:040000 040000 53c1effc5b22746bb83cdbc6a419bf898067882d 9606f7275fde188a056fd174aa1d622ac0630893 M fs
I have a file corruption regression bisected to above. (The one step before def4af30cf945a3735ffca865788ea84b30b25d9
was fine)
The test:
- I have an exofs filesystem mounted on /mnt/exofs
- []$ cd /mnt/exofs/some_linux_git; git status;
All is fine
- []$ mount -t nfs4 -o minorversion=0 localhost:/ /mnt/nfs
(Where etc/exports will export /mnt/exofs via nfs4.1)
- []$ cd /mnt/nfs/some_linux_git; git status;
This will fail and will corrupt the .git/index file. Sometimes the file would be
too short, and sometimes the file will become a directory (Yes really)
Simple revert of this patch over 2.6.34-rc2 will not work so I've not checked it.
A single threaded read like: "diff -r /mnt/nfs/some_linux_git /mnt/nfs/some_linux_git.back"
or even "diff -r /mnt/exofs/some_linux_git /mnt/nfs/some_linux_git" works fine.
A simple dd write test works fine as well.
So it looks like a race that only something like git can exercise, with multi threaded
reads and writes, through nfs/nfsd.
I know Benny also had failures with files export ontop of 2.6.34-rc2
(I looked at the patch, it is totally out of my league, please help)
I will try to reproduce this with a more conventional FS, or any thing else
I should test?
Thanks
Boaz
--
To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
