[Bugs] [Bug 1212110] bricks process crash

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1212110



--- Comment #4 from Krutika Dhananjay <kdhananj at redhat.com> ---
OK, it has nothing to do with http://review.gluster.org/#/c/10180/. RCA'd it.
Will send out a patch soon.

The bug is hit with quota due to a race between xattrop and unlink.
After quota winds an xattrop fop on a path, if by the time it reaches posix,
another client has unlinked it, the brick crashes due to the absence of the
gfid link && the absence of a proper NULL-check to handle this case. The fix
involves handling the case of missing gfid link on the backend, in posix xlator
appropriately and returning failure to the xlator above.

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