It looks like FSAL_MDCACHE changes patch cafbe60c broke more than exports 
op redirection for pNFS.

state_add() is called by acquire_layout_state() with the mutex held so we 
might need an option on state_add()  the indicates if the mutex is held.

After that problem we hit another export ops below that is not directed to 
the real FSAL, is there a way to fix them all and not one at a time?
 
Thanks, Marc.

        /* max_segment_count is also an indication of if fsal supports 
pnfs */
        max_segment_count = op_ctx->fsal_export->exp_ops.
                        fs_maximum_segments(op_ctx->fsal_export);

        if (max_segment_count == 0) {
                LogWarn(COMPONENT_PNFS,
                        "The FSAL must specify a non-zero 
fs_maximum_segments.");
                nfs_status = NFS4ERR_LAYOUTUNAVAILABLE;
                goto out;
        } 



From:   Marc Eshel/Almaden/IBM@IBMUS
To:     "Frank Filz" <ffilz...@mindspring.com>
Cc:     nfs-ganesha-devel@lists.sourceforge.net
Date:   07/22/2016 04:00 PM
Subject:        Re: [Nfs-ganesha-devel] Announce Push of V2.4-dev-26



We are making progress, now we return the file layout attribute
   197.618970099   9141 TRACE_GANESHA: [work-65] nfs4_FSALattr_To_Fattr 
:NFS4 :F_DBG :Encoded attr 62, name = FATTR4_FS_LAYOUT_TYPES

but we fail on the first layout get
   210.125317087   9147 TRACE_GANESHA: [work-71] nfs4_Compound :NFS4 
:DEBUG :Request 2: opcode 50 is OP_LAYOUTGET
   210.137484089   9147 TRACE_GANESHA: [work-71] nfs4_Compound :NFS4 
:M_DBG :NFS4: MID DEBUG: Check export perms export = 000000f0 req = 
00000040
   210.149620502   9147 TRACE_GANESHA: [work-71] state_add :RW LOCK :CRIT 
:Error 35, write locking 0x7f5e040012b0 (&obj->state_hdl->state_lock) at 
/nas/ganesha/new-ganesha/src/SAL/nfs4_state.c:299

Marc.



From:   "Frank Filz" <ffilz...@mindspring.com>
To:     <nfs-ganesha-devel@lists.sourceforge.net>
Date:   07/22/2016 02:16 PM
Subject:        [Nfs-ganesha-devel] Announce Push of V2.4-dev-26



Branch next

Tag:V2.4-dev-26

Release Highlights

* A variety of small fixes

* RGW: Add 3 new config options

Signed-off-by: Frank S. Filz <ffilz...@mindspring.com>

Contents:

5ba03b2 Frank S. Filz V2.4-dev-26
77c71ae Marc Eshel GPFS_FSAL: Use a shorter file handle.
a910381 Swen Schillig [valgrind] memory leak in mdcache_exp_release()
1c45f6a Matt Benjamin rgw: add 3 new config options
93631a9 Malahal Naineni Chomp tailing slash from pseudopath
036703e Kaleb S KEITHLEY misc fsals: 32-bit fmt strings, gcc-6.1 possible
uninit'd use
a336200 Soumya Koduri FSAL_GLUSTER/Upcall: Change poll interval to 10us
0923be1 Soumya Koduri FSAL_GLUSTER: Coverity fixes
e9f4d55 ajay nair Fixes error in sample configuration file of FSAL ZFS
f7c37f7 ajay Removed warnings in make by solving conflicts from 
cong_yacc.y
7d67e10 Daniel Gryniewicz Clang fix - don't double initialize
9ec03b6 Daniel Gryniewicz Coverity fixes
d3eff0f Daniel Gryniewicz MDCACHE - stack all the pNFS export ops
f75b336 Frank S. Filz NFS4: Actually set fsid and fileid in the returned
attributes


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