From patchwork Tue Dec 16 19:01:52 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Haynes X-Patchwork-Id: 5503231 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id EC759BEEBA for ; Tue, 16 Dec 2014 19:03:46 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 06DA7209BD for ; Tue, 16 Dec 2014 19:03:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F19CB2092B for ; Tue, 16 Dec 2014 19:03:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751341AbaLPTDo (ORCPT ); Tue, 16 Dec 2014 14:03:44 -0500 Received: from mail-pd0-f173.google.com ([209.85.192.173]:42053 "EHLO mail-pd0-f173.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750986AbaLPTDn (ORCPT ); Tue, 16 Dec 2014 14:03:43 -0500 Received: by mail-pd0-f173.google.com with SMTP id ft15so14406771pdb.18 for ; Tue, 16 Dec 2014 11:03:43 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ukS8mS6ot2q1X+aJbOO/cqMxpCbbDmYFbTJ47dNnV24=; b=DFzP3uncds/wUjgx8oHCN0IyUb1nYQg4JxnItOYkXujUl1UafmVbmgdvgZEZOA8L4/ Ot/9fmc1z5wy4HPufSLeeEsmM2DNDNYd1EyhPZUUx3b1zahix4EgBOk7BrVV5KGEqvwa WsyGoY1je8kyHCog0T0eUnJkxfbZM9EV2V92J5zi5RMx5ulsoW67WgPg560ZYlmEc0yD EW0qS8D9dLFuBY1TNzmYgjBqdqIPOEvMIzPk0Q52UqZS/8Ru4zXv2IQJZ8NCQ9FcaPr3 /dsBtuRn8THk/v218x0vNdzF5wKZr8XqTh2XtxuMvsVU0Pl+wdrUOjnraefZ5KjOxzhq LGkg== X-Gm-Message-State: ALoCoQmMiOHHRsFedrQybzPvD3IrT5k8B1HAxCSq7YVECsGBty3Uyf1JYKFyF60ZNs33OsGBNMo2 X-Received: by 10.67.5.2 with SMTP id ci2mr26667255pad.36.1418756622285; Tue, 16 Dec 2014 11:03:42 -0800 (PST) Received: from localhost.localdomain ([50.242.95.105]) by mx.google.com with ESMTPSA id q4sm1620669pdh.79.2014.12.16.11.03.41 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 16 Dec 2014 11:03:41 -0800 (PST) From: Tom Haynes X-Google-Original-From: Tom Haynes To: Trond Myklebust Cc: Linux NFS Mailing List Subject: [PATCH 49/50] nfs41: wait for LAYOUTRETURN before retrying LAYOUTGET Date: Tue, 16 Dec 2014 11:01:52 -0800 Message-Id: <1418756513-95187-50-git-send-email-loghyr@primarydata.com> X-Mailer: git-send-email 1.9.3 In-Reply-To: <1418756513-95187-1-git-send-email-loghyr@primarydata.com> References: <1418756513-95187-1-git-send-email-loghyr@primarydata.com> Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Peng Tao Also take care to stop waiting if someone clears retry bit. Signed-off-by: Peng Tao --- fs/nfs/nfs4proc.c | 4 +++- fs/nfs/pnfs.c | 39 ++++++++++++++++++++++++++++++++++++++- fs/nfs/pnfs.h | 5 ++++- 3 files changed, 45 insertions(+), 3 deletions(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 72c5e01..f05e965 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -7786,7 +7786,9 @@ static void nfs4_layoutreturn_release(void *calldata) spin_lock(&lo->plh_inode->i_lock); if (lrp->res.lrs_present) pnfs_set_layout_stateid(lo, &lrp->res.stateid, true); - clear_bit(NFS_LAYOUT_RETURN, &lo->plh_flags); + clear_bit_unlock(NFS_LAYOUT_RETURN, &lo->plh_flags); + smp_mb__after_atomic(); + wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); clear_bit(NFS_LAYOUT_RETURN_BEFORE_CLOSE, &lo->plh_flags); rpc_wake_up(&NFS_SERVER(lo->plh_inode)->roc_rpcwaitq); lo->plh_block_lgets--; diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index fec1d897..8c1440d 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -1404,6 +1404,26 @@ static bool pnfs_within_mdsthreshold(struct nfs_open_context *ctx, return ret; } +/* stop waiting if someone clears NFS_LAYOUT_RETRY_LAYOUTGET bit. */ +static int pnfs_layoutget_retry_bit_wait(struct wait_bit_key *key) +{ + if (!test_bit(NFS_LAYOUT_RETRY_LAYOUTGET, key->flags)) + return 1; + return nfs_wait_bit_killable(key); +} + +static bool pnfs_prepare_to_retry_layoutget(struct pnfs_layout_hdr *lo) +{ + /* + * send layoutcommit as it can hold up layoutreturn due to lseg + * reference + */ + pnfs_layoutcommit_inode(lo->plh_inode, false); + return !wait_on_bit_action(&lo->plh_flags, NFS_LAYOUT_RETURN, + pnfs_layoutget_retry_bit_wait, + TASK_UNINTERRUPTIBLE); +} + /* * Layout segment is retreived from the server if not cached. * The appropriate layout segment is referenced and returned to the caller. @@ -1450,7 +1470,8 @@ lookup_again: } /* if LAYOUTGET already failed once we don't try again */ - if (pnfs_layout_io_test_failed(lo, iomode)) + if (pnfs_layout_io_test_failed(lo, iomode) && + !pnfs_should_retry_layoutget(lo)) goto out_unlock; first = list_empty(&lo->plh_segs); @@ -1475,6 +1496,22 @@ lookup_again: goto out_unlock; } + /* + * Because we free lsegs before sending LAYOUTRETURN, we need to wait + * for LAYOUTRETURN even if first is true. + */ + if (!lseg && pnfs_should_retry_layoutget(lo) && + test_bit(NFS_LAYOUT_RETURN, &lo->plh_flags)) { + spin_unlock(&ino->i_lock); + dprintk("%s wait for layoutreturn\n", __func__); + if (pnfs_prepare_to_retry_layoutget(lo)) { + pnfs_put_layout_hdr(lo); + dprintk("%s retrying\n", __func__); + goto lookup_again; + } + goto out_put_layout_hdr; + } + if (pnfs_layoutgets_blocked(lo, &arg, 0)) goto out_unlock; atomic_inc(&lo->plh_outstanding); diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 67a436b..c2b4328 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -358,8 +358,11 @@ static inline void pnfs_set_retry_layoutget(struct pnfs_layout_hdr *lo) static inline void pnfs_clear_retry_layoutget(struct pnfs_layout_hdr *lo) { - if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) + if (test_and_clear_bit(NFS_LAYOUT_RETRY_LAYOUTGET, &lo->plh_flags)) { atomic_dec(&lo->plh_refcount); + /* wake up waiters for LAYOUTRETURN as that is not needed */ + wake_up_bit(&lo->plh_flags, NFS_LAYOUT_RETURN); + } } static inline bool pnfs_should_retry_layoutget(struct pnfs_layout_hdr *lo)