[Bugs] [Bug 1543279] Moving multiple temporary files to the same destination concurrently causes ESTALE error

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1543279



--- Comment #8 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/19707 committed in master by "Shyamsundar
Ranganathan" <srangana at redhat.com> with a commit message- tests/bug-1110262.t:
fix a race condition

This test does:

1. mount a volume
2. kill a brick in the volume
3. mkdir (/somedir)

In my local tests and in [1], I see that mkdir in step 3 fails because
there is no dht-layout on root directory.

The reason I think is by the time first lookup on "/" hit dht, a brick
was killed as per step 2. This means layout was not healed for "/" and
since this is a new volume, no layout is present on it. Note that the
first lookup done on "/" by fuse-bridge is not synchronized with
parent process of daemonized glusterfs mount completing. IOW, by the
time glusterfs cmd executed there is no guarantee that lookup on "/"
is complete. So, if step 2 races ahead of fuse_first_lookup on "/", we
end up with an invalid dht-layout on "/" resulting in failures.

Doint an operation like ls makes sure that lookup on "/" is completed
before we kill a brick

Change-Id: Ie0c4e442c4c629fad6f7ae850437e3d63fe4bea9
Signed-off-by: Raghavendra G <rgowdapp at redhat.com>
BUG: 1543279

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