From patchwork Wed Mar 2 12:08:12 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Mkrtchyan, Tigran" X-Patchwork-Id: 8480481 Return-Path: X-Original-To: patchwork-linux-nfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 512DF9F2F0 for ; Wed, 2 Mar 2016 12:08:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 419DC2037E for ; Wed, 2 Mar 2016 12:08:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9A31B200DC for ; Wed, 2 Mar 2016 12:08:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753197AbcCBMIV (ORCPT ); Wed, 2 Mar 2016 07:08:21 -0500 Received: from smtp-o-1.desy.de ([131.169.56.154]:48186 "EHLO smtp-o-1.desy.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751609AbcCBMIU (ORCPT ); Wed, 2 Mar 2016 07:08:20 -0500 X-Clacks-Overhead: GNU Terry Pratchett Received: from smtp-map-1.desy.de (smtp-map-1.desy.de [131.169.56.66]) by smtp-o-1.desy.de (DESY-O-1) with ESMTP id 2665028019C for ; Wed, 2 Mar 2016 13:08:18 +0100 (CET) Received: from ZITSWEEP2.win.desy.de (zitsweep2.win.desy.de [131.169.97.96]) by smtp-map-1.desy.de (DESY_MAP_1) with ESMTP id 0D8C813E8B for ; Wed, 2 Mar 2016 13:08:17 +0100 (MET) Received: from smtp-intra-3.desy.de (lb-40-26.desy.de) by ZITSWEEP2.win.desy.de (Clearswift SMTPRS 5.5.0) with ESMTP id ; Wed, 2 Mar 2016 13:08:17 +0100 Received: from anahit.desy.de (anahit.desy.de [131.169.185.68]) by smtp-intra-3.desy.de (DESY-INTRA-3) with ESMTP id 81A311152; Wed, 2 Mar 2016 13:08:16 +0100 (MET) From: Tigran Mkrtchyan To: trond.myklebust@primarydata.com Cc: linux-nfs@vger.kernel.org, Tigran Mkrtchyan Subject: [PATCH] pnfs support servers with multiple layout types Date: Wed, 2 Mar 2016 13:08:12 +0100 Message-Id: <1456920492-22533-1-git-send-email-tigran.mkrtchyan@desy.de> X-Mailer: git-send-email 2.5.0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Spam-Status: No, score=-5.9 required=5.0 tests=BAYES_00,HK_RANDOM_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 current NFSv4.1/pNFS client assumes that MDS supports only one layout type. While it's true for most existing servers, nevertheless, this can be change in the near future. This patch is an attempt to multi layouttype MDS support. To make it possible for such servers to function with existing clients, server must always send default layout type first in the list. The client starts processing layout types starting from the second element and will fall back to the wfirst one, if none of presented types is supported. Testing done: - started a server with nfs4_file and flex_file layout - new kernel picked flexr_-file layout - old complained about multiple layout types and proceeded nfs4_file layout Signed-off-by: Tigran Mkrtchyan --- fs/nfs/client.c | 2 +- fs/nfs/nfs4xdr.c | 23 ++++++++++------------- fs/nfs/pnfs.c | 45 ++++++++++++++++++++++++++++++++------------- fs/nfs/pnfs.h | 2 +- include/linux/nfs_xdr.h | 8 +++++++- 5 files changed, 51 insertions(+), 29 deletions(-) diff --git a/fs/nfs/client.c b/fs/nfs/client.c index d6d5d2a..ec8e7db 100644 --- a/fs/nfs/client.c +++ b/fs/nfs/client.c @@ -787,7 +787,7 @@ int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, struct nfs } fsinfo.fattr = fattr; - fsinfo.layouttype = 0; + memset(fsinfo.layouttype, 0, sizeof(fsinfo.layouttype)); error = clp->rpc_ops->fsinfo(server, mntfh, &fsinfo); if (error < 0) goto out_error; diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index 4e44412..ac8747b 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -4702,14 +4702,13 @@ static int decode_getfattr(struct xdr_stream *xdr, struct nfs_fattr *fattr, } /* - * Decode potentially multiple layout types. Currently we only support - * one layout driver per file system. + * Decode potentially multiple layout types. */ -static int decode_first_pnfs_layout_type(struct xdr_stream *xdr, +static int decode_pnfs_layout_types(struct xdr_stream *xdr, uint32_t *layouttype) { __be32 *p; - int num; + uint32_t num, i; p = xdr_inline_decode(xdr, 4); if (unlikely(!p)) @@ -4718,18 +4717,17 @@ static int decode_first_pnfs_layout_type(struct xdr_stream *xdr, /* pNFS is not supported by the underlying file system */ if (num == 0) { - *layouttype = 0; return 0; } - if (num > 1) - printk(KERN_INFO "NFS: %s: Warning: Multiple pNFS layout " - "drivers per filesystem not supported\n", __func__); + if (num > NFS_MAX_LAYOUT_TYPES) + printk(KERN_INFO "NFS: %s: Warning: Too many (%d) pNFS layout types\n", __func__, num); /* Decode and set first layout type, move xdr->p past unused types */ p = xdr_inline_decode(xdr, num * 4); if (unlikely(!p)) goto out_overflow; - *layouttype = be32_to_cpup(p); + for(i = 0; i < num && i < NFS_MAX_LAYOUT_TYPES; i++) + layouttype[i] = be32_to_cpup(p++); return 0; out_overflow: print_overflow_msg(__func__, xdr); @@ -4749,10 +4747,9 @@ static int decode_attr_pnfstype(struct xdr_stream *xdr, uint32_t *bitmap, if (unlikely(bitmap[1] & (FATTR4_WORD1_FS_LAYOUT_TYPES - 1U))) return -EIO; if (bitmap[1] & FATTR4_WORD1_FS_LAYOUT_TYPES) { - status = decode_first_pnfs_layout_type(xdr, layouttype); + status = decode_pnfs_layout_types(xdr, layouttype); bitmap[1] &= ~FATTR4_WORD1_FS_LAYOUT_TYPES; - } else - *layouttype = 0; + } return status; } @@ -4833,7 +4830,7 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo) status = decode_attr_time_delta(xdr, bitmap, &fsinfo->time_delta); if (status != 0) goto xdr_error; - status = decode_attr_pnfstype(xdr, bitmap, &fsinfo->layouttype); + status = decode_attr_pnfstype(xdr, bitmap, fsinfo->layouttype); if (status != 0) goto xdr_error; diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c index 2fa483e..6b3b67a 100644 --- a/fs/nfs/pnfs.c +++ b/fs/nfs/pnfs.c @@ -102,32 +102,51 @@ unset_pnfs_layoutdriver(struct nfs_server *nfss) * Try to set the server's pnfs module to the pnfs layout type specified by id. * Currently only one pNFS layout driver per filesystem is supported. * - * @id layout type. Zero (illegal layout type) indicates pNFS not in use. + * @ids array of layout types supported by MDS. */ void set_pnfs_layoutdriver(struct nfs_server *server, const struct nfs_fh *mntfh, - u32 id) + u32 *ids) { struct pnfs_layoutdriver_type *ld_type = NULL; + u32 id; + int i; - if (id == 0) - goto out_no_driver; if (!(server->nfs_client->cl_exchange_flags & (EXCHGID4_FLAG_USE_NON_PNFS | EXCHGID4_FLAG_USE_PNFS_MDS))) { - printk(KERN_ERR "NFS: %s: id %u cl_exchange_flags 0x%x\n", - __func__, id, server->nfs_client->cl_exchange_flags); + printk(KERN_ERR "NFS: %s: cl_exchange_flags 0x%x\n", + __func__, server->nfs_client->cl_exchange_flags); goto out_no_driver; } - ld_type = find_pnfs_driver(id); - if (!ld_type) { + /* + * If server supports more than one layout types. + * By assuming, that server will put 'common default' as the first + * entry, try all following entries ibefore and fall back to the default + * if we did not found a matching one. + */ + for(i = 1; i < NFS_MAX_LAYOUT_TYPES && ids[i] != 0; i++) { + id = ids[i]; request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); ld_type = find_pnfs_driver(id); - if (!ld_type) { - dprintk("%s: No pNFS module found for %u.\n", - __func__, id); - goto out_no_driver; - } + if(ld_type) + goto found_module; + + dprintk("%s: No pNFS module found for %u.\n", __func__, id); + } + + /* + * no other layout types found. Try default one. + */ + id = ids[0]; + request_module("%s-%u", LAYOUT_NFSV4_1_MODULE_PREFIX, id); + ld_type = find_pnfs_driver(id); + + if (!ld_type) { + dprintk("%s: No pNFS module found for %u.\n", __func__, id); + goto out_no_driver; } + +found_module: server->pnfs_curr_ld = ld_type; if (ld_type->set_layoutdriver && ld_type->set_layoutdriver(server, mntfh)) { diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index 1ac1db5..5d7d9e0 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -234,7 +234,7 @@ void pnfs_get_layout_hdr(struct pnfs_layout_hdr *lo); void pnfs_put_lseg(struct pnfs_layout_segment *lseg); void pnfs_put_lseg_locked(struct pnfs_layout_segment *lseg); -void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32); +void set_pnfs_layoutdriver(struct nfs_server *, const struct nfs_fh *, u32 *); void unset_pnfs_layoutdriver(struct nfs_server *); void pnfs_generic_pg_init_read(struct nfs_pageio_descriptor *, struct nfs_page *); int pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc); diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index d320906..e45bcb9 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -125,6 +125,12 @@ struct nfs_fattr { | NFS_ATTR_FATTR_V4_SECURITY_LABEL) /* + * Maximal number of supported layout drivers. + */ +#define NFS_MAX_LAYOUT_TYPES 8 + + +/* * Info on the file system */ struct nfs_fsinfo { @@ -139,7 +145,7 @@ struct nfs_fsinfo { __u64 maxfilesize; struct timespec time_delta; /* server time granularity */ __u32 lease_time; /* in seconds */ - __u32 layouttype; /* supported pnfs layout driver */ + __u32 layouttype[NFS_MAX_LAYOUT_TYPES]; /* supported pnfs layout driver */ __u32 blksize; /* preferred pnfs io block size */ __u32 clone_blksize; /* granularity of a CLONE operation */ };