From patchwork Sat May 11 02:42:37 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benny Halevy X-Patchwork-Id: 2552921 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork2.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork2.kernel.org (Postfix) with ESMTP id 290DADF2A2 for ; Sat, 11 May 2013 02:42:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756781Ab3EKCmp (ORCPT ); Fri, 10 May 2013 22:42:45 -0400 Received: from mail-wi0-f172.google.com ([209.85.212.172]:52853 "EHLO mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754337Ab3EKCmo (ORCPT ); Fri, 10 May 2013 22:42:44 -0400 Received: by mail-wi0-f172.google.com with SMTP id hm14so1201985wib.17 for ; Fri, 10 May 2013 19:42:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=x-received:sender:from:to:subject:date:message-id:x-mailer :in-reply-to:references; bh=k/xiMr2QlMKMOyTMPeCF3P67WvV+z61DwSRSykans2w=; b=Pm9s2SFJ31QbZAikm/Q4n2SxAAsBRumJ7KskX2qpw/ZD30MwfxIH9rTGTnTDI5WZRl yhQJVik4joOEkuPiK+qEGAhtynQdc3QB6GpPqsyDBAokyVCHIstlPL2uI0dIgnEKwCLN F8MOCXbdTQq0UwaAaspCImlZ+mCanP+8T3fAqHl8sjV7sy3MkZ2OE7Kkn3n6HDfmCrX0 VaxrMEpQxUrjBqPKyK0juJoAb8azrw+QraeB9UrxKkB+1ws94ZkueL8N/Pg0BxggGYfw ty2Ka/0+oC4fdk3zMuq1noGH/XAT5Dukt+OANeqCFC3SAQFC6wlIjjSat3k0atfi00K+ i4HA== X-Received: by 10.180.210.225 with SMTP id mx1mr7255017wic.15.1368240163195; Fri, 10 May 2013 19:42:43 -0700 (PDT) Received: from bhalevy-lt.il.tonian.com (bzq-79-180-144-28.red.bezeqint.net. [79.180.144.28]) by mx.google.com with ESMTPSA id i4sm1153461wix.10.2013.05.10.19.42.41 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 10 May 2013 19:42:42 -0700 (PDT) From: Benny Halevy To: linux-nfs@vger.kernel.org Subject: [PATCH 03/38] Revert "pnfsd: update ds stateid from mds" Date: Sat, 11 May 2013 05:42:37 +0300 Message-Id: <1368240157-31834-1-git-send-email-bhalevy@tonian.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <518B6377.3000207@tonian.com> References: <518B6377.3000207@tonian.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org This reverts commit 9bf768bb5e8ea1d6c258fc59c779a26806fdbde9. --- fs/nfsd/nfs4pnfsds.c | 595 --------------------------------------------------- 1 file changed, 595 deletions(-) delete mode 100644 fs/nfsd/nfs4pnfsds.c diff --git a/fs/nfsd/nfs4pnfsds.c b/fs/nfsd/nfs4pnfsds.c deleted file mode 100644 index 13fe811..0000000 --- a/fs/nfsd/nfs4pnfsds.c +++ /dev/null @@ -1,595 +0,0 @@ -/* -* linux/fs/nfsd/nfs4pnfsds.c -* -* Copyright (c) 2005 The Regents of the University of Michigan. -* All rights reserved. -* -* Andy Adamson -* -* Redistribution and use in source and binary forms, with or without -* modification, are permitted provided that the following conditions -* are met: -* -* 1. Redistributions of source code must retain the above copyright -* notice, this list of conditions and the following disclaimer. -* 2. Redistributions in binary form must reproduce the above copyright -* notice, this list of conditions and the following disclaimer in the -* documentation and/or other materials provided with the distribution. -* 3. Neither the name of the University nor the names of its -* contributors may be used to endorse or promote products derived -* from this software without specific prior written permission. -* -* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED -* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF -* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE -* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE -* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR -* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF -* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR -* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING -* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS -* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. -* -*/ -#if defined(CONFIG_PNFSD) - -#define NFSDDBG_FACILITY NFSDDBG_PNFS - -#include -#include -#include -#include -#include -#include - -#include "nfsd.h" -#include "pnfsd.h" -#include "state.h" - -/* - * Hash tables for pNFS Data Server state - * - * mds_nodeid: list of struct pnfs_mds_id one per Metadata server (MDS) using - * this data server (DS). - * - * mds_clid_hashtbl[]: uses clientid_hashval(), hash of all clientids obtained - * from any MDS. - * - * ds_stid_hashtbl[]: uses stateid_hashval(), hash of all stateids obtained - * from any MDS. - * - */ -/* Hash tables for clientid state */ -#define CLIENT_HASH_BITS 4 -#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS) -#define CLIENT_HASH_MASK (CLIENT_HASH_SIZE - 1) - -#define clientid_hashval(id) \ - ((id) & CLIENT_HASH_MASK) - -/* hash table for pnfs_ds_stateid */ -#define STATEID_HASH_BITS 10 -#define STATEID_HASH_SIZE (1 << STATEID_HASH_BITS) -#define STATEID_HASH_MASK (STATEID_HASH_SIZE - 1) - -static int stateid_hashval(stateid_t *stidp) -{ - unsigned v = stidp->si_opaque.so_clid.cl_boot ^ - stidp->si_opaque.so_clid.cl_id ^ - stidp->si_opaque.so_id; - return v & STATEID_HASH_MASK; -} - -static struct list_head mds_id_tbl; -static struct list_head mds_clid_hashtbl[CLIENT_HASH_SIZE]; -static struct list_head ds_stid_hashtbl[STATEID_HASH_SIZE]; - -static void put_ds_clientid(struct pnfs_ds_clientid *dcp); -static void put_ds_mdsid(struct pnfs_mds_id *mdp); - -/* Mutex for data server state. Needs to be separate from - * mds state mutex since a node can be both mds and ds */ -static DEFINE_MUTEX(ds_mutex); -static struct thread_info *ds_mutex_owner; - -static void -ds_lock_state(void) -{ - mutex_lock(&ds_mutex); - ds_mutex_owner = current_thread_info(); -} - -static void -ds_unlock_state(void) -{ - BUG_ON(ds_mutex_owner != current_thread_info()); - ds_mutex_owner = NULL; - mutex_unlock(&ds_mutex); -} - -static int -cmp_clid(const clientid_t *cl1, const clientid_t *cl2) -{ - return (cl1->cl_boot == cl2->cl_boot) && - (cl1->cl_id == cl2->cl_id); -} - -void -nfs4_pnfs_state_init(void) -{ - int i; - - for (i = 0; i < CLIENT_HASH_SIZE; i++) - INIT_LIST_HEAD(&mds_clid_hashtbl[i]); - - for (i = 0; i < STATEID_HASH_SIZE; i++) - INIT_LIST_HEAD(&ds_stid_hashtbl[i]); - - INIT_LIST_HEAD(&mds_id_tbl); -} - -static struct pnfs_mds_id * -find_pnfs_mds_id(u32 mdsid) -{ - struct pnfs_mds_id *local = NULL; - - dprintk("pNFSD: %s\n", __func__); - list_for_each_entry(local, &mds_id_tbl, di_hash) { - if (local->di_mdsid == mdsid) - return local; - } - return NULL; -} - -static struct pnfs_ds_clientid * -find_pnfs_ds_clientid(const clientid_t *clid) -{ - struct pnfs_ds_clientid *local = NULL; - unsigned int hashval; - - dprintk("pNFSD: %s\n", __func__); - - hashval = clientid_hashval(clid->cl_id); - list_for_each_entry(local, &mds_clid_hashtbl[hashval], dc_hash) { - if (cmp_clid(&local->dc_mdsclid, clid)) - return local; - } - return NULL; -} - -/* FIXME: Can we use the server generic idr based stateid bookeeping introduced in 3.2? */ -static struct pnfs_ds_stateid * -find_pnfs_ds_stateid(stateid_t *stidp) -{ - struct pnfs_ds_stateid *local = NULL; - unsigned int hashval; - - dprintk("pNFSD: %s\n", __func__); - - hashval = stateid_hashval(stidp); - list_for_each_entry(local, &ds_stid_hashtbl[hashval], ds_hash) - if (!memcmp(&local->ds_stid.si_opaque, &stidp->si_opaque, sizeof(stidp->si_opaque))) { - stateid_t *sid = &local->ds_stid; - dprintk("NFSD: %s <-- %p ds_flags %lx " STATEID_FMT "\n", - __func__, local, local->ds_flags, - STATEID_VAL(sid)); - return local; - } - return NULL; -} - -static void -release_ds_mdsid(struct kref *kref) -{ - struct pnfs_mds_id *mdp = - container_of(kref, struct pnfs_mds_id, di_ref); - dprintk("pNFSD: %s\n", __func__); - - list_del(&mdp->di_hash); - list_del(&mdp->di_mdsclid); - kfree(mdp); -} - -static void -release_ds_clientid(struct kref *kref) -{ - struct pnfs_ds_clientid *dcp = - container_of(kref, struct pnfs_ds_clientid, dc_ref); - struct pnfs_mds_id *mdp; - dprintk("pNFSD: %s\n", __func__); - - mdp = find_pnfs_mds_id(dcp->dc_mdsid); - if (mdp) - put_ds_mdsid(mdp); - - list_del(&dcp->dc_hash); - list_del(&dcp->dc_stateid); - list_del(&dcp->dc_permdsid); - kfree(dcp); -} - -static void -release_ds_stateid(struct kref *kref) -{ - struct pnfs_ds_stateid *dsp = - container_of(kref, struct pnfs_ds_stateid, ds_ref); - struct pnfs_ds_clientid *dcp; - dprintk("pNFS %s: dsp %p\n", __func__, dsp); - - dcp = find_pnfs_ds_clientid(&dsp->ds_mdsclid); - if (dcp) - put_ds_clientid(dcp); - - list_del(&dsp->ds_hash); - list_del(&dsp->ds_perclid); - kfree(dsp); -} - -static void -put_ds_clientid(struct pnfs_ds_clientid *dcp) -{ - dprintk("pNFS %s: dcp %p ref %d\n", __func__, dcp, - atomic_read(&dcp->dc_ref.refcount)); - kref_put(&dcp->dc_ref, release_ds_clientid); -} - -static void -get_ds_clientid(struct pnfs_ds_clientid *dcp) -{ - dprintk("pNFS %s: dcp %p ref %d\n", __func__, dcp, - atomic_read(&dcp->dc_ref.refcount)); - kref_get(&dcp->dc_ref); -} - -static void -put_ds_mdsid(struct pnfs_mds_id *mdp) -{ - dprintk("pNFS %s: mdp %p ref %d\n", __func__, mdp, - atomic_read(&mdp->di_ref.refcount)); - kref_put(&mdp->di_ref, release_ds_mdsid); -} - -static void -get_ds_mdsid(struct pnfs_mds_id *mdp) -{ - dprintk("pNFS %s: mdp %p ref %d\n", __func__, mdp, - atomic_read(&mdp->di_ref.refcount)); - kref_get(&mdp->di_ref); -} - -static void -put_ds_stateid(struct pnfs_ds_stateid *dsp) -{ - dprintk("pNFS %s: dsp %p ref %d\n", __func__, dsp, - atomic_read(&dsp->ds_ref.refcount)); - kref_put(&dsp->ds_ref, release_ds_stateid); -} - -static void -get_ds_stateid(struct pnfs_ds_stateid *dsp) -{ - dprintk("pNFS %s: dsp %p ref %d\n", __func__, dsp, - atomic_read(&dsp->ds_ref.refcount)); - kref_get(&dsp->ds_ref); -} - -static struct pnfs_mds_id * -alloc_init_mds_id(struct pnfs_get_state *gsp) -{ - struct pnfs_mds_id *mdp; - - dprintk("pNFSD: %s\n", __func__); - - mdp = kmalloc(sizeof(*mdp), GFP_KERNEL); - if (!mdp) - return NULL; - INIT_LIST_HEAD(&mdp->di_hash); - INIT_LIST_HEAD(&mdp->di_mdsclid); - list_add(&mdp->di_hash, &mds_id_tbl); - mdp->di_mdsid = gsp->dsid; - mdp->di_mdsboot = 0; - kref_init(&mdp->di_ref); - return mdp; -} - -static struct pnfs_ds_clientid * -alloc_init_ds_clientid(struct pnfs_get_state *gsp) -{ - struct pnfs_mds_id *mdp; - struct pnfs_ds_clientid *dcp; - clientid_t *clid = (clientid_t *)&gsp->clid; - unsigned int hashval = clientid_hashval(clid->cl_id); - - dprintk("pNFSD: %s\n", __func__); - - mdp = find_pnfs_mds_id(gsp->dsid); - if (!mdp) { - mdp = alloc_init_mds_id(gsp); - if (!mdp) - return NULL; - } else { - get_ds_mdsid(mdp); - } - - dcp = kmalloc(sizeof(*dcp), GFP_KERNEL); - if (!dcp) - return NULL; - - INIT_LIST_HEAD(&dcp->dc_hash); - INIT_LIST_HEAD(&dcp->dc_stateid); - INIT_LIST_HEAD(&dcp->dc_permdsid); - list_add(&dcp->dc_hash, &mds_clid_hashtbl[hashval]); - list_add(&dcp->dc_permdsid, &mdp->di_mdsclid); - dcp->dc_mdsclid = *clid; - kref_init(&dcp->dc_ref); - dcp->dc_mdsid = gsp->dsid; - return dcp; -} - -static struct pnfs_ds_stateid * -alloc_init_ds_stateid(struct svc_fh *cfh, stateid_t *stidp) -{ - struct pnfs_ds_stateid *dsp; - - dprintk("pNFSD: %s\n", __func__); - - dsp = kmalloc(sizeof(*dsp), GFP_KERNEL); - if (!dsp) - return dsp; - - INIT_LIST_HEAD(&dsp->ds_hash); - INIT_LIST_HEAD(&dsp->ds_perclid); - memcpy(&dsp->ds_stid, stidp, sizeof(dsp->ds_stid)); - fh_copy_shallow(&dsp->ds_fh, &cfh->fh_handle); - dsp->ds_access = 0; - dsp->ds_status = 0; - dsp->ds_flags = 0L; - kref_init(&dsp->ds_ref); - set_bit(DS_STATEID_NEW, &dsp->ds_flags); - clear_bit(DS_STATEID_VALID, &dsp->ds_flags); - clear_bit(DS_STATEID_ERROR, &dsp->ds_flags); - init_waitqueue_head(&dsp->ds_waitq); - - list_add(&dsp->ds_hash, &ds_stid_hashtbl[stateid_hashval(stidp)]); - dprintk("pNFSD: %s <-- dsp %p\n", __func__, dsp); - return dsp; -} - -static int -update_ds_stateid(struct pnfs_ds_stateid *dsp, struct svc_fh *cfh, - struct pnfs_get_state *gsp) -{ - struct pnfs_ds_clientid *dcp; - int new = 0; - - dprintk("pNFSD: %s dsp %p\n", __func__, dsp); - - dcp = find_pnfs_ds_clientid((clientid_t *)&gsp->clid); - if (!dcp) { - dcp = alloc_init_ds_clientid(gsp); - if (!dcp) - return 1; - new = 1; - } - if (test_bit(DS_STATEID_NEW, &dsp->ds_flags)) { - list_add(&dsp->ds_perclid, &dcp->dc_stateid); - if (!new) - get_ds_clientid(dcp); - } - - memcpy(&dsp->ds_stid, &gsp->stid, sizeof(stateid_t)); - dsp->ds_access = gsp->access; - dsp->ds_status = 0; - dsp->ds_verifier[0] = gsp->verifier[0]; - dsp->ds_verifier[1] = gsp->verifier[1]; - memcpy(&dsp->ds_mdsclid, &gsp->clid, sizeof(clientid_t)); - set_bit(DS_STATEID_VALID, &dsp->ds_flags); - clear_bit(DS_STATEID_ERROR, &dsp->ds_flags); - clear_bit(DS_STATEID_NEW, &dsp->ds_flags); - return 0; -} - -int -nfs4_pnfs_cb_change_state(struct pnfs_get_state *gs) -{ - stateid_t *stid = (stateid_t *)&gs->stid; - struct pnfs_ds_stateid *dsp; - - dprintk("pNFSD: %s stateid=" STATEID_FMT "\n", __func__, - STATEID_VAL(stid)); - - ds_lock_state(); - dsp = find_pnfs_ds_stateid(stid); - if (dsp) - put_ds_stateid(dsp); - ds_unlock_state(); - - dprintk("pNFSD: %s dsp %p\n", __func__, dsp); - - if (dsp) - return 0; - return -ENOENT; -} - -/* Retrieves and validates stateid. - * If stateid exists and its fields match, return it. - * If stateid exists but either the generation or - * ownerids don't match, check with mds to see if it is valid. - * If the stateid doesn't exist, the first thread creates a - * invalid *marker* stateid, then checks to see if the - * stateid exists on the mds. If so, it validates the *marker* - * stateid and updates its fields. Subsequent threads that - * find the *marker* stateid wait until it is valid or an error - * occurs. - * Called with ds_state_lock. - */ -static struct pnfs_ds_stateid * -nfsv4_ds_get_state(struct svc_fh *cfh, stateid_t *stidp) -{ - struct inode *ino = cfh->fh_dentry->d_inode; - struct super_block *sb; - struct pnfs_ds_stateid *dsp = NULL; - struct pnfs_get_state gs = { - .access = 0, - }; - int status = 0, waiter = 0; - - dprintk("pNFSD: %s -->\n", __func__); - - dsp = find_pnfs_ds_stateid(stidp); - /* Note: we assume same endianess on MDS and DS */ - if (dsp && test_bit(DS_STATEID_VALID, &dsp->ds_flags) && - (stidp->si_generation == dsp->ds_stid.si_generation)) - goto out_noput; - - sb = ino->i_sb; - if (!sb || !sb->s_pnfs_op->get_state) - goto out_noput; - - /* Uninitialize current state if it exists yet it doesn't match. - * If it is already invalid, another thread is checking state */ - if (dsp) { - if (!test_and_clear_bit(DS_STATEID_VALID, &dsp->ds_flags)) - waiter = 1; - } else { - dsp = alloc_init_ds_stateid(cfh, stidp); - if (!dsp) - goto out_noput; - } - - dprintk("pNFSD: %s Starting loop\n", __func__); - get_ds_stateid(dsp); - while (!test_bit(DS_STATEID_VALID, &dsp->ds_flags)) { - ds_unlock_state(); - - /* Another thread is checking the state */ - if (waiter) { - dprintk("pNFSD: %s waiting\n", __func__); - wait_event_interruptible_timeout(dsp->ds_waitq, - (test_bit(DS_STATEID_VALID, &dsp->ds_flags) || - test_bit(DS_STATEID_ERROR, &dsp->ds_flags)), - msecs_to_jiffies(1024)); - dprintk("pNFSD: %s awake\n", __func__); - ds_lock_state(); - if (test_bit(DS_STATEID_ERROR, &dsp->ds_flags)) - goto out; - - continue; - } - - /* Validate stateid on mds */ - dprintk("pNFSD: %s Checking state on MDS\n", __func__); - memcpy(&gs.stid, stidp, sizeof(gs.stid)); - status = sb->s_pnfs_op->get_state(ino, &cfh->fh_handle, &gs); - dprintk("pNFSD: %s from MDS status %d\n", __func__, status); - ds_lock_state(); - /* if !status and stateid is valid, update id and mark valid */ - if (status || update_ds_stateid(dsp, cfh, &gs)) { - set_bit(DS_STATEID_ERROR, &dsp->ds_flags); - /* remove invalid stateid from list */ - put_ds_stateid(dsp); - wake_up(&dsp->ds_waitq); - goto out; - } - - wake_up(&dsp->ds_waitq); - } -out: - if (dsp) - put_ds_stateid(dsp); -out_noput: - if (dsp) - dprintk("pNFSD: %s <-- dsp %p ds_flags %lx " STATEID_FMT "\n", - __func__, dsp, dsp->ds_flags, STATEID_VAL(&dsp->ds_stid)); - /* If error, return null */ - if (dsp && test_bit(DS_STATEID_ERROR, &dsp->ds_flags)) - dsp = NULL; - dprintk("pNFSD: %s <-- dsp %p\n", __func__, dsp); - return dsp; -} - -int -nfs4_preprocess_pnfs_ds_stateid(struct svc_fh *cfh, stateid_t *stateid) -{ - struct pnfs_ds_stateid *dsp; - int status = 0; - - dprintk("pNFSD: %s --> " STATEID_FMT "\n", __func__, - STATEID_VAL(stateid)); - - /* Must release state lock while verifying stateid on mds */ - nfs4_unlock_state(); - ds_lock_state(); - dsp = nfsv4_ds_get_state(cfh, stateid); - if (dsp) { - get_ds_stateid(dsp); - dprintk("pNFSD: %s Found " STATEID_FMT "\n", __func__, - STATEID_VAL(&dsp->ds_stid)); - - dprintk("NFSD: %s: dsp %p fh_size %u:%u " - "fh [%08x:%08x:%08x:%08x]:[%08x:%08x:%08x:%08x] " - "gen %x:%x\n", - __func__, dsp, - cfh->fh_handle.fh_size, dsp->ds_fh.fh_size, - ((unsigned *)&cfh->fh_handle.fh_base)[0], - ((unsigned *)&cfh->fh_handle.fh_base)[1], - ((unsigned *)&cfh->fh_handle.fh_base)[2], - ((unsigned *)&cfh->fh_handle.fh_base)[3], - ((unsigned *)&dsp->ds_fh.fh_base)[0], - ((unsigned *)&dsp->ds_fh.fh_base)[1], - ((unsigned *)&dsp->ds_fh.fh_base)[2], - ((unsigned *)&dsp->ds_fh.fh_base)[3], - stateid->si_generation, dsp->ds_stid.si_generation); - } - - if (!dsp || - (cfh->fh_handle.fh_size != dsp->ds_fh.fh_size) || - (memcmp(&cfh->fh_handle.fh_base, &dsp->ds_fh.fh_base, - dsp->ds_fh.fh_size) != 0) || - (stateid->si_generation > dsp->ds_stid.si_generation)) - status = nfserr_bad_stateid; - else if (stateid->si_generation < dsp->ds_stid.si_generation) - status = nfserr_old_stateid; - - if (dsp) - put_ds_stateid(dsp); - ds_unlock_state(); - nfs4_lock_state(); - dprintk("pNFSD: %s <-- status %d\n", __func__, be32_to_cpu(status)); - return status; -} - -void -nfs4_ds_get_verifier(stateid_t *stateid, struct super_block *sb, u32 *p) -{ - struct pnfs_ds_stateid *dsp = NULL; - - dprintk("pNFSD: %s --> stid %p\n", __func__, stateid); - - ds_lock_state(); - if (stateid != NULL) { - dsp = find_pnfs_ds_stateid(stateid); - if (dsp) - get_ds_stateid(dsp); - } - - /* XXX: Should we fetch the stateid or wait if some other - * thread is currently retrieving the stateid ? */ - if (dsp && test_bit(DS_STATEID_VALID, &dsp->ds_flags)) { - *p++ = dsp->ds_verifier[0]; - *p++ = dsp->ds_verifier[1]; - put_ds_stateid(dsp); - } else { - /* must be on MDS */ - ds_unlock_state(); - sb->s_pnfs_op->get_verifier(sb, p); - ds_lock_state(); - p += 2; - } - ds_unlock_state(); - dprintk("pNFSD: %s <-- dsp %p\n", __func__, dsp); - return; -} - -#endif /* CONFIG_PNFSD */