Return-Path: Received: from mx142.netapp.com ([216.240.21.19]:63470 "EHLO mx142.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751707AbcEKTIz (ORCPT ); Wed, 11 May 2016 15:08:55 -0400 From: To: CC: , , , Andy Adamson Subject: [PATCH Version 4 07/10] NFS probe pseudo-fs for replicas Date: Wed, 11 May 2016 15:08:22 -0400 Message-ID: <1462993705-14673-8-git-send-email-andros@netapp.com> In-Reply-To: <1462993705-14673-1-git-send-email-andros@netapp.com> References: <1462993705-14673-1-git-send-email-andros@netapp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Andy Adamson Probe an NFSv4 Pseudo-fs for fs_locations replicas. Replicas on a Pseudo-fs returns multipath addresses for the server which will be tested for session trunking. Signed-off-by: Andy Adamson --- fs/nfs/internal.h | 2 ++ fs/nfs/nfs4getroot.c | 3 ++ fs/nfs/nfs4proc.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++ fs/nfs/nfs4xdr.c | 14 ++++++++- include/linux/nfs_xdr.h | 4 +-- 5 files changed, 104 insertions(+), 3 deletions(-) diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index f1d1d2c..4a65288 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -528,6 +528,8 @@ extern int nfs40_walk_client_list(struct nfs_client *clp, extern int nfs41_walk_client_list(struct nfs_client *clp, struct nfs_client **result, struct rpc_cred *cred); +extern void nfs4_get_pseudofs_replicas(struct nfs_server *server, + struct nfs_fh *mntfh); static inline struct inode *nfs_igrab_and_active(struct inode *inode) { diff --git a/fs/nfs/nfs4getroot.c b/fs/nfs/nfs4getroot.c index 039b3eb..4c1f5e4 100644 --- a/fs/nfs/nfs4getroot.c +++ b/fs/nfs/nfs4getroot.c @@ -36,6 +36,9 @@ int nfs4_get_rootfh(struct nfs_server *server, struct nfs_fh *mntfh, bool auth_p } memcpy(&server->fsid, &fsinfo.fattr->fsid, sizeof(server->fsid)); + + nfs4_get_pseudofs_replicas(server, mntfh); + out: nfs_free_fattr(fsinfo.fattr); dprintk("<-- nfs4_get_rootfh() = %d\n", ret); diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 70537f0..8263ee8 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -3253,6 +3253,90 @@ static int nfs4_do_find_root_sec(struct nfs_server *server, return nfs_v4_minor_ops[mv]->find_root_sec(server, fhandle, info); } +static int _nfs4_proc_fs_locations_probe(struct nfs_server *server, + struct nfs_fh *fhandle, + struct nfs4_fs_locations *fs_locations, + struct page *page) +{ + u32 bitmask[3] = { + [0] = FATTR4_WORD0_FS_LOCATIONS, + }; + struct nfs4_fs_locations_arg args = { + .fh = fhandle, + .page = page, + .bitmask = bitmask, + .replicas = 1, + }; + struct nfs4_fs_locations_res res = { + .fs_locations = fs_locations, + .replicas = 1, + }; + struct rpc_message msg = { + .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS], + .rpc_argp = &args, + .rpc_resp = &res, + }; + struct rpc_clnt *clnt = server->nfs_client->cl_rpcclient; + int status = 0; + + nfs_fattr_init(&fs_locations->fattr); + fs_locations->nlocations = 0; + fs_locations->server = server; + status = nfs4_call_sync(clnt, server, &msg, &args.seq_args, + &res.seq_res, 0); + return status; +} + +static int nfs4_proc_fs_locations_probe(struct nfs_server *server, + struct nfs_fh *fhandle, + struct nfs4_fs_locations *fs_locations, + struct page *page) +{ + struct nfs4_exception exception = { }; + int err; + + do { + err = _nfs4_proc_fs_locations_probe(server, fhandle, + fs_locations, page); + err = nfs4_handle_exception(server, err, &exception); + } while (exception.retry); + return err; +} + + +/** + * Probe the pseudo filesystem for an fs_locations replicas list. + * Note: The replicas list on a pseudofs is a list of multipath + * addresses + */ +void nfs4_get_pseudofs_replicas(struct nfs_server *server, + struct nfs_fh *mntfh) +{ + struct page *page = NULL; + struct nfs4_fs_locations *locations = NULL; + int status; + + if (server->nfs_client->cl_minorversion == 0) + return; + + page = alloc_page(GFP_KERNEL); + if (page == NULL) + goto out; + locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL); + if (locations == NULL) + goto out; + + status = nfs4_proc_fs_locations_probe(server, mntfh, locations, page); + if (status != 0) + goto out; + + /* test replicas for session trunking here */ +out: + if (page) + __free_page(page); + kfree(locations); +} + /** * nfs4_proc_get_rootfh - get file handle for server's pseudoroot * @server: initialized nfs_server handle diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index 88474a4..4dfd136 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -2685,7 +2685,11 @@ static void nfs4_xdr_enc_fs_locations(struct rpc_rqst *req, encode_compound_hdr(xdr, req, &hdr); encode_sequence(xdr, &args->seq_args, &hdr); - if (args->migration) { + if (args->replicas) { + encode_putfh(xdr, args->fh, &hdr); + replen = hdr.replen; + encode_fs_locations(xdr, args->bitmask, &hdr); + } else if (args->migration) { encode_putfh(xdr, args->fh, &hdr); replen = hdr.replen; encode_fs_locations(xdr, args->bitmask, &hdr); @@ -6916,6 +6920,14 @@ static int nfs4_xdr_dec_fs_locations(struct rpc_rqst *req, status = decode_putfh(xdr); if (status) goto out; + if (res->replicas) { + xdr_enter_page(xdr, PAGE_SIZE); + status = decode_getfattr_generic(xdr, + &res->fs_locations->fattr, + NULL, res->fs_locations, + NULL, res->fs_locations->server); + goto out; + } if (res->migration) { xdr_enter_page(xdr, PAGE_SIZE); status = decode_getfattr_generic(xdr, diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index d320906..ab9a08a2 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -1120,13 +1120,13 @@ struct nfs4_fs_locations_arg { struct page *page; const u32 *bitmask; clientid4 clientid; - unsigned char migration:1, renew:1; + unsigned char migration:1, renew:1, replicas:1; }; struct nfs4_fs_locations_res { struct nfs4_sequence_res seq_res; struct nfs4_fs_locations *fs_locations; - unsigned char migration:1, renew:1; + unsigned char migration:1, renew:1, replicas:1; }; struct nfs4_secinfo4 { -- 1.8.3.1