Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx11.netapp.com ([216.240.18.76]:31011 "EHLO mx11.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751614AbaLQWfa (ORCPT ); Wed, 17 Dec 2014 17:35:30 -0500 From: Anna Schumaker To: , Subject: [PATCH 1/3] NFS: Add basic support for READ_PLUS Date: Wed, 17 Dec 2014 17:35:24 -0500 Message-ID: <1418855726-14262-2-git-send-email-Anna.Schumaker@Netapp.com> In-Reply-To: <1418855726-14262-1-git-send-email-Anna.Schumaker@Netapp.com> References: <1418855726-14262-1-git-send-email-Anna.Schumaker@Netapp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org List-ID: The client will only decode a single segment of type NFS4_CONTENT_DATA with this patch. This is to match the current behavior of READ before introducing support for holes. Signed-off-by: Anna Schumaker --- fs/nfs/nfs42xdr.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++ fs/nfs/nfs4proc.c | 30 +++++++++- fs/nfs/nfs4xdr.c | 1 + include/linux/nfs4.h | 1 + include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 2 +- 6 files changed, 172 insertions(+), 3 deletions(-) diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c index 038a7e1..c0d266d 100644 --- a/fs/nfs/nfs42xdr.c +++ b/fs/nfs/nfs42xdr.c @@ -13,6 +13,15 @@ #define encode_deallocate_maxsz (op_encode_hdr_maxsz + \ encode_fallocate_maxsz) #define decode_deallocate_maxsz (op_decode_hdr_maxsz) +#define encode_read_plus_maxsz (op_encode_hdr_maxsz + \ + encode_stateid_maxsz + 3) +#define decode_read_plus_maxsz (op_decode_hdr_maxsz + \ + 1 /* rpr_eof */ + \ + 1 /* rpr_contents count */ + \ + 1 /* data_content4 */ + \ + 2 /* data_info4.di_offset */ + \ + 2 /* data_info4.di_length */) + #define encode_seek_maxsz (op_encode_hdr_maxsz + \ encode_stateid_maxsz + \ 2 /* offset */ + \ @@ -35,6 +44,12 @@ #define NFS4_dec_deallocate_sz (compound_decode_hdr_maxsz + \ decode_putfh_maxsz + \ decode_deallocate_maxsz) +#define NFS4_enc_read_plus_sz (compound_encode_hdr_maxsz + \ + encode_putfh_maxsz + \ + encode_read_plus_maxsz) +#define NFS4_dec_read_plus_sz (compound_decode_hdr_maxsz + \ + decode_putfh_maxsz + \ + decode_read_plus_maxsz) #define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \ encode_putfh_maxsz + \ encode_seek_maxsz) @@ -67,6 +82,16 @@ static void encode_deallocate(struct xdr_stream *xdr, encode_fallocate(xdr, args); } +static void encode_read_plus(struct xdr_stream *xdr, + struct nfs_pgio_args *args, + struct compound_hdr *hdr) +{ + encode_op_hdr(xdr, OP_READ_PLUS, decode_read_plus_maxsz, hdr); + encode_nfs4_stateid(xdr, &args->stateid); + encode_uint64(xdr, args->offset); + encode_uint32(xdr, args->count); +} + static void encode_seek(struct xdr_stream *xdr, struct nfs42_seek_args *args, struct compound_hdr *hdr) @@ -114,6 +139,28 @@ static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req, } /* + * Encode READ_PLUS request + */ +static void nfs4_xdr_enc_read_plus(struct rpc_rqst *req, + struct xdr_stream *xdr, + struct nfs_pgio_args *args) +{ + struct compound_hdr hdr = { + .minorversion = nfs4_xdr_minorversion(&args->seq_args), + }; + + encode_compound_hdr(xdr, req, &hdr); + encode_sequence(xdr, &args->seq_args, &hdr); + encode_putfh(xdr, args->fh, &hdr); + encode_read_plus(xdr, args, &hdr); + + xdr_inline_pages(&req->rq_rcv_buf, hdr.replen << 2, + args->pages, args->pgbase, args->count); + req->rq_rcv_buf.flags |= XDRBUF_READ; + encode_nops(&hdr); +} + +/* * Encode SEEK request */ static void nfs4_xdr_enc_seek(struct rpc_rqst *req, @@ -141,6 +188,73 @@ static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_falloc_res *re return decode_op_hdr(xdr, OP_DEALLOCATE); } +static int decode_read_plus_data(struct xdr_stream *xdr, struct nfs_pgio_res *res) +{ + __be32 *p; + uint32_t count, recvd; + uint64_t offset; + + p = xdr_inline_decode(xdr, 8 + 4); + if (unlikely(!p)) + goto out_overflow; + + p = xdr_decode_hyper(p, &offset); + count = be32_to_cpup(p); + + recvd = xdr_read_pages(xdr, count); + if (count > recvd) { + dprintk("NFS: server cheating in read reply: " + "count %u > recvd %u\n", count, recvd); + count = recvd; + res->eof = 0; + } + + res->count = count; + return 0; +out_overflow: + print_overflow_msg(__func__, xdr); + return -EIO; +} + +static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res) +{ + __be32 *p; + int status, type; + uint32_t segments; + + status = decode_op_hdr(xdr, OP_READ_PLUS); + if (status) + return status; + + p = xdr_inline_decode(xdr, 4 + 4); + if (unlikely(!p)) + goto out_overflow; + + res->eof = be32_to_cpup(p++); + segments = be32_to_cpup(p++); + if (segments == 0) { + res->count = 0; + return 0; + } + + p = xdr_inline_decode(xdr, 4); + if (unlikely(!p)) + goto out_overflow; + + type = be32_to_cpup(p++); + if (type == NFS4_CONTENT_DATA) + status = decode_read_plus_data(xdr, res); + else + status = -ENOTSUPP; + + if (segments > 1) + res->eof = 0; + return status; +out_overflow: + print_overflow_msg(__func__, xdr); + return -EIO; +} + static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res) { int status; @@ -212,6 +326,32 @@ out: } /* + * Decode READ_PLUS request + */ +static int nfs4_xdr_dec_read_plus(struct rpc_rqst *rqstp, + struct xdr_stream *xdr, + struct nfs_pgio_res *res) +{ + struct compound_hdr hdr; + int status; + + status = decode_compound_hdr(xdr, &hdr); + if (status) + goto out; + status = decode_sequence(xdr, &res->seq_res, rqstp); + if (status) + goto out; + status = decode_putfh(xdr); + if (status) + goto out; + status = decode_read_plus(xdr, res); + if (!status) + status = res->count; +out: + return status; +} + +/* * Decode SEEK request */ static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp, diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index e7f8d5f..f8ee42f 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -68,6 +68,10 @@ #include "nfs4trace.h" +#ifdef CONFIG_NFS_V4_2 +#include "nfs42.h" +#endif /* CONFIG_NFS_V4_2 */ + #define NFSDBG_FACILITY NFSDBG_PROC #define NFS4_POLL_RETRY_MIN (HZ/10) @@ -4147,9 +4151,15 @@ static bool nfs4_read_stateid_changed(struct rpc_task *task, static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) { - + struct nfs_server *server = NFS_SERVER(hdr->inode); dprintk("--> %s\n", __func__); + if ((server->caps & NFS_CAP_READ_PLUS) && (task->tk_status == -ENOTSUPP)) { + server->caps &= ~NFS_CAP_READ_PLUS; + if (rpc_restart_call_prepare(task)) + task->tk_status = 0; + return -EAGAIN; + } if (!nfs4_sequence_done(task, &hdr->res.seq_res)) return -EAGAIN; if (nfs4_read_stateid_changed(task, &hdr->args)) @@ -4158,12 +4168,27 @@ static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr) nfs4_read_done_cb(task, hdr); } +#ifdef CONFIG_NFS_V4_2 +static void nfs42_read_plus_support(struct nfs_server *server, struct rpc_message *msg) +{ + if (server->caps & NFS_CAP_READ_PLUS) + msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS]; + else + msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; +} +#else +static void nfs42_read_plus_support(struct nfs_server *server, struct rpc_message *msg) +{ + msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; +} +#endif /* CONFIG_NFS_V4_2 */ + static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr, struct rpc_message *msg) { hdr->timestamp = jiffies; hdr->pgio_done_cb = nfs4_read_done_cb; - msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ]; + nfs42_read_plus_support(NFS_SERVER(hdr->inode), msg); nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0); } @@ -8426,6 +8451,7 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { | NFS_CAP_ATOMIC_OPEN_V1 | NFS_CAP_ALLOCATE | NFS_CAP_DEALLOCATE + | NFS_CAP_READ_PLUS | NFS_CAP_SEEK, .init_client = nfs41_init_client, .shutdown_client = nfs41_shutdown_client, diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index cb4376b..8b48483 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -7398,6 +7398,7 @@ struct rpc_procinfo nfs4_procedures[] = { PROC(SEEK, enc_seek, dec_seek), PROC(ALLOCATE, enc_allocate, dec_allocate), PROC(DEALLOCATE, enc_deallocate, dec_deallocate), + PROC(READ_PLUS, enc_read_plus, dec_read_plus), #endif /* CONFIG_NFS_V4_2 */ }; diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index 022b761..41fc2f4 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -492,6 +492,7 @@ enum { NFSPROC4_CLNT_SEEK, NFSPROC4_CLNT_ALLOCATE, NFSPROC4_CLNT_DEALLOCATE, + NFSPROC4_CLNT_READ_PLUS, }; /* nfs41 types */ diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index 1e37fbb..e246348 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -233,5 +233,6 @@ struct nfs_server { #define NFS_CAP_SEEK (1U << 19) #define NFS_CAP_ALLOCATE (1U << 20) #define NFS_CAP_DEALLOCATE (1U << 21) +#define NFS_CAP_READ_PLUS (1U << 22) #endif diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 467c84e..239c5ba 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -512,7 +512,7 @@ struct nfs_pgio_args { struct nfs_pgio_res { struct nfs4_sequence_res seq_res; struct nfs_fattr * fattr; - __u32 count; + __u64 count; int eof; /* used by read */ struct nfs_writeverf * verf; /* used by write */ const struct nfs_server *server; /* used by write */ -- 2.1.3