Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx2.netapp.com ([216.240.18.37]:53331 "EHLO mx2.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757988Ab2IUUv2 (ORCPT ); Fri, 21 Sep 2012 16:51:28 -0400 From: Trond Myklebust To: linux-nfs@vger.kernel.org Subject: [PATCH v2 07/26] NFSv4.1: Retry pNFS after a 2 minute timeout Date: Fri, 21 Sep 2012 16:50:02 -0400 Message-Id: <1348260621-10294-7-git-send-email-Trond.Myklebust@netapp.com> In-Reply-To: <1348260621-10294-6-git-send-email-Trond.Myklebust@netapp.com> References: <1348260621-10294-1-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-2-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-3-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-4-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-5-git-send-email-Trond.Myklebust@netapp.com> <1348260621-10294-6-git-send-email-Trond.Myklebust@netapp.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: If we had to fall back to read/write through MDS, then assume that we should retry pNFS after a suitable timeout period. The following patch sets a timeout of 2 minutes. Signed-off-by: Trond Myklebust --- fs/nfs/pnfs.c | 15 ++++++++++++++- fs/nfs/pnfs.h | 1 + 2 files changed, 15 insertions(+), 1 deletion(-) diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index f85cc4c..6656cb4 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -35,6 +35,7 @@ #include "iostat.h" #define NFSDBG_FACILITY NFSDBG_PNFS +#define PNFS_LAYOUTGET_RETRY_TIMEOUT (120*HZ) /* Locking: * @@ -248,6 +249,7 @@ pnfs_iomode_to_fail_bit(u32 iomode) static void pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) { + lo->plh_retry_timestamp = jiffies; set_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags); dprintk("%s Setting layout IOMODE_%s fail bit\n", __func__, iomode == IOMODE_RW ? "RW" : "READ"); @@ -256,7 +258,18 @@ pnfs_layout_io_set_failed(struct pnfs_layout_hdr *lo, u32 iomode) static bool pnfs_layout_io_test_failed(struct pnfs_layout_hdr *lo, u32 iomode) { - return test_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags) != 0; + unsigned long start, end; + if (test_bit(pnfs_iomode_to_fail_bit(iomode), &lo->plh_flags) == 0) + return false; + end = jiffies; + start = end - PNFS_LAYOUTGET_RETRY_TIMEOUT; + if (!time_in_range(lo->plh_retry_timestamp, start, end)) { + /* It is time to retry the failed layoutgets */ + clear_bit(NFS_LAYOUT_RW_FAILED, &lo->plh_flags); + clear_bit(NFS_LAYOUT_RO_FAILED, &lo->plh_flags); + return false; + } + return true; } static void diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index e3eb7d1..bc8e500 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -140,6 +140,7 @@ struct pnfs_layout_hdr { atomic_t plh_outstanding; /* number of RPCs out */ unsigned long plh_block_lgets; /* block LAYOUTGET if >0 */ u32 plh_barrier; /* ignore lower seqids */ + unsigned long plh_retry_timestamp; unsigned long plh_flags; loff_t plh_lwb; /* last write byte for layoutcommit */ struct rpc_cred *plh_lc_cred; /* layoutcommit cred */ -- 1.7.11.4