Description of problem:
while I/O is happening on the mount point keep on add-brick for a stripe volume then I/O fails at some point in time

Version-Release number of selected component (if applicable):
Mainline

How reproducible:
often

Steps to Reproduce:
1.create a stripe volume with count 2
2.mount the volume and start kernel untar on the mount point
3.keep on adding bricks to the volume i.e. volume becomes distributed-stripe with increasing distribute count
  
Actual results:
I/O fails

Expected results:
untar should succeed

Additional info:

This test passes on distributed-stripe without brick count change, passed on plain stripe , passed on plain distribute.


LOG
====


[2012-02-21 00:10:27.702464] I [client-handshake.c:923:client_setvolume_cbk] 3-strvol-client-9: Connected to 10.1.11.118:24049, attached to remote volume '/br/st10'.
[2012-02-21 00:10:27.706431] I [fuse-bridge.c:3699:fuse_graph_setup] 0-fuse: switched to graph 3
[2012-02-21 00:10:28.601401] E [stripe.c:137:stripe_ctx_handle] 3-strvol-stripe-1: Failed to get stripe-size
[2012-02-21 00:10:28.880476] E [stripe.c:487:stripe_lookup_cbk] 3-strvol-stripe-1: Error getting fctx info from dict
[2012-02-21 00:10:28.880552] E [stripe.c:137:stripe_ctx_handle] 3-strvol-stripe-1: Failed to get stripe-size
[2012-02-21 00:10:28.880585] E [stripe.c:487:stripe_lookup_cbk] 3-strvol-stripe-1: Error getting fctx info from dict
[2012-02-21 00:16:48.568906] E [stripe.c:137:stripe_ctx_handle] 3-strvol-stripe-0: Failed to get stripe-size
[2012-02-21 00:16:48.576113] E [stripe.c:487:stripe_lookup_cbk] 3-strvol-stripe-0: Error getting fctx info from dict
[2012-02-21 00:16:48.576170] E [stripe.c:137:stripe_ctx_handle] 3-strvol-stripe-0: Failed to get stripe-size
[2012-02-21 00:16:48.576191] E [stripe.c:487:stripe_lookup_cbk] 3-strvol-stripe-0: Error getting fctx info from dict