Description of problem:
On a volume with a fuse client, cding into a directrory and changing the graph (like turning off some performance xlators)  will make operations on the fuse client say No such file or directory since resolve is not happening properly.

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


How reproducible:
Always

Steps to Reproduce:
1. create a volume and mount it via fuse
2. cd into a directory and change the graph
3. try to create some file or directory
  
Actual results:

 touch new
touch: cannot touch `new': No such file or directory
root@hyperspace:/mnt/client/dir# mkdir dir
mkdir: cannot create directory `dir': No such file or directory
root@hyperspace:/mnt/client/dir# 

Expected results:
Files and directories should be created.

Additional info:
 30:     option latency-measurement off
 31:     option count-fop-hits off
 32:     subvolumes vol-stat-prefetch
 33: end-volume

+------------------------------------------------------------------------------+
[2012-01-27 11:47:24.935091] I [rpc-clnt.c:1604:rpc_clnt_reconfig] 2-vol-client-0: changing port to 24009 (from 0)
[2012-01-27 11:47:25.811399] I [client-handshake.c:1086:select_server_supported_programs] 1-vol-client-0: Using Program GlusterFS 3git, Num (1
298437), Version (310)
[2012-01-27 11:47:25.812080] I [client-handshake.c:918:client_setvolume_cbk] 1-vol-client-0: Connected to 127.0.0.1:24009, attached to remote 
volume '/mnt/sda7/export3'.
[2012-01-27 11:47:25.826759] I [fuse-bridge.c:3718:fuse_graph_setup] 0-fuse: switched to graph 1
[2012-01-27 11:47:27.257810] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:47:27.258109] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:47:27.258391] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:47:28.812517] I [client-handshake.c:1086:select_server_supported_programs] 2-vol-client-0: Using Program GlusterFS 3git, Num (1298437), Version (310)
[2012-01-27 11:47:28.813190] I [client-handshake.c:918:client_setvolume_cbk] 2-vol-client-0: Connected to 127.0.0.1:24009, attached to remote volume '/mnt/sda7/export3'.
[2012-01-27 11:47:28.824662] I [fuse-bridge.c:3718:fuse_graph_setup] 0-fuse: switched to graph 2
[2012-01-27 11:47:48.287305] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:47:48.287639] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:29.926752] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:29.927033] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:31.027245] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:31.027846] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:32.342754] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:32.347750] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:32.360481] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:48:35.252240] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:49:44.286944] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:49:44.287317] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:51:02.417802] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 11:51:02.418186] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 12:02:03.177170] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 12:02:03.177454] E [fuse-resolve.c:192:fuse_resolve_gfid] 0-glusterfs-fuse: xl is NULL
[2012-01-27 12:02:05.276491] I [fuse-bridge.c:3617:fuse_thread_proc] 0-fuse: unmounting /mnt/client
[2012-01-27 12:02:05.277240] W [glusterfsd.c:783:cleanup_and_exit] (-->/lib/x86_64-linux-gnu/libc.so.6(clone+0x6d) [0x7f51e28ea04d] (-->/lib/x86_64-linux-gnu/libpthread.so.0(+0x6d8c) [0x7f51e2b9ed8c] (-->/usr/local/sbin/glusterfs(glusterfs_sigwaiter+0xea) [0x40744a]))) 0-: received signum (15), shutting down