[Gluster-devel] posix-locks: running ls on file (or directory containing file) while file is being written causes failure

[Kevan Benson]

glusterfs 1.3.1 TLA 489 / Fuse 2.7.0 GLFS3

When writing a file from a client, an operation that does a listing on 
that file from another client while the file is being written causes the 
write operation to fail when the posix-locks feature is used.

I can replicate this with multiple config types, with AFR and Unify on 
the server, or on the client, or in the simplest case, with absolutely 
no special xlators besides posix-locks and a single server.  Here's the 
configs for that case:

Here's what it looks like:
# dd if=/dev/zero of=/mnt/glusterfs/testfile.10MB bs=1k count=10k
dd: writing `/mnt/glusterfs/testfile.10MB': Bad file descriptor
4006+0 records in
4005+0 records out
dd: closing output file `/mnt/glusterfs/testfile.10MB': Bad file descriptor

On the other client I'm simply running this to cause the error:
# ls /mnt/glusterfs/

Here's the configs for the simplest case:

# server.vol
volume share
        type storage/posix
        option directory /exports/test
end-volume

volume brick
        type features/posix-locks
        subvolumes share
end-volume

volume server
        type protocol/server
        option transport-type tcp/server
        option listen-port 6996
        subvolumes brick
        option auth.ip.brick.allow *
end-volume

volume trace
        type debug/trace
        subvolumes server
        option debug on
end-volume


# client.vol
volume brick
        type protocol/client
        option transport-type tcp/client
        option remote-host 172.16.1.81
        option remote-port 6996
        option remote-subvolume brick
end-volume