[Bugs] [Bug 1258334] New: Sharding - Unlink of VM images can sometimes fail with EINVAL

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1258334

            Bug ID: 1258334
           Summary: Sharding - Unlink of VM images can sometimes fail with
                    EINVAL
           Product: GlusterFS
           Version: mainline
         Component: sharding
          Assignee: bugs at gluster.org
          Reporter: kdhananj at redhat.com
        QA Contact: bugs at gluster.org
                CC: bugs at gluster.org



Description of problem:

Thanks to Paul Cuzner for reporting this issue.
rm -rf on VM images in sharded volumes sometimes fails with EINVAL.

rhev-data-center-mnt-glusterSD-gprfc085-glfs.rhev-rhss.lab:vmdomain.log:[2015-08-30
22:27:32.842940] W [fuse-bridge.c:1292:fuse_unlink_cbk] 0-glusterfs-fuse:
22544605: UNLINK()
/2ad90339-5c1b-4b0e-b728-3df651ecd025/images/_remouLgHrB/e39cb165-831a-46cb-88da-e26cc93d9399
=> -1 (Invalid argument)
rhev-data-center-mnt-glusterSD-gprfc085-glfs.rhev-rhss.lab:vmdomain.log:[2015-08-30
22:27:59.238742] W [fuse-bridge.c:1292:fuse_unlink_cbk] 0-glusterfs-fuse:
22545653: UNLINK()
/2ad90339-5c1b-4b0e-b728-3df651ecd025/images/_remotGxj4J/aaa115ea-7577-4358-856e-a0101b7b94a2
=> -1 (Invalid argument)

Turns out the bug is in shard_unlink_shards_do() wherein the loop that winds
unlinks on individual shards must check for the inode associated with every
shard to exist in memory (local->inode_list[]) before winding unlink on it.


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