From: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx> This patch adds client support for decoding a single NFS4_CONTENT_DATA segment returned by the server. This is the simplest implementation possible, since it does not account for any hole segments in the reply. Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx> --- fs/nfs/nfs42xdr.c | 138 ++++++++++++++++++++++++++++++++++++++ fs/nfs/nfs4proc.c | 32 ++++++++- fs/nfs/nfs4xdr.c | 1 + include/linux/nfs4.h | 2 +- include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 2 +- 6 files changed, 171 insertions(+), 5 deletions(-) diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c index c03f3246d6c5..bf118ecabe2c 100644 --- a/fs/nfs/nfs42xdr.c +++ b/fs/nfs/nfs42xdr.c @@ -45,6 +45,15 @@ #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 NFS42_READ_PLUS_SEGMENT_SIZE (1 /* data_content4 */ + \ + 2 /* data_info4.di_offset */ + \ + 2 /* data_info4.di_length */) +#define decode_read_plus_maxsz (op_decode_hdr_maxsz + \ + 1 /* rpr_eof */ + \ + 1 /* rpr_contents count */ + \ + NFS42_READ_PLUS_SEGMENT_SIZE) #define encode_seek_maxsz (op_encode_hdr_maxsz + \ encode_stateid_maxsz + \ 2 /* offset */ + \ @@ -128,6 +137,14 @@ decode_putfh_maxsz + \ decode_deallocate_maxsz + \ decode_getattr_maxsz) +#define NFS4_enc_read_plus_sz (compound_encode_hdr_maxsz + \ + encode_sequence_maxsz + \ + encode_putfh_maxsz + \ + encode_read_plus_maxsz) +#define NFS4_dec_read_plus_sz (compound_decode_hdr_maxsz + \ + decode_sequence_maxsz + \ + decode_putfh_maxsz + \ + decode_read_plus_maxsz) #define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \ encode_sequence_maxsz + \ encode_putfh_maxsz + \ @@ -252,6 +269,16 @@ static void encode_deallocate(struct xdr_stream *xdr, encode_fallocate(xdr, args); } +static void encode_read_plus(struct xdr_stream *xdr, + const 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, const struct nfs42_seek_args *args, struct compound_hdr *hdr) @@ -446,6 +473,29 @@ static void nfs4_xdr_enc_deallocate(struct rpc_rqst *req, encode_nops(&hdr); } +/* + * Encode READ_PLUS request + */ +static void nfs4_xdr_enc_read_plus(struct rpc_rqst *req, + struct xdr_stream *xdr, + const void *data) +{ + const struct nfs_pgio_args *args = data; + 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); + + rpc_prepare_reply_pages(req, args->pages, args->pgbase, + args->count, hdr.replen); + req->rq_rcv_buf.flags |= XDRBUF_READ; + encode_nops(&hdr); +} + /* * Encode SEEK request */ @@ -694,6 +744,67 @@ static int decode_deallocate(struct xdr_stream *xdr, struct nfs42_falloc_res *re return decode_op_hdr(xdr, OP_DEALLOCATE); } +static uint32_t decode_read_plus_data(struct xdr_stream *xdr, struct nfs_pgio_res *res, + uint32_t *eof) +{ + __be32 *p; + uint32_t count, recvd; + uint64_t offset; + + p = xdr_inline_decode(xdr, 8 + 4); + if (unlikely(!p)) + return -EIO; + + p = xdr_decode_hyper(p, &offset); + count = be32_to_cpup(p); + if (count == 0) + return 0; + + 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; + *eof = 0; + } + + return count; +} + +static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res) +{ + __be32 *p; + uint32_t count, eof, segments, type; + int status; + + status = decode_op_hdr(xdr, OP_READ_PLUS); + if (status) + return status; + + p = xdr_inline_decode(xdr, 4 + 4); + if (unlikely(!p)) + return -EIO; + + eof = be32_to_cpup(p++); + segments = be32_to_cpup(p++); + if (segments == 0) + return 0; + + p = xdr_inline_decode(xdr, 4); + if (unlikely(!p)) + return -EIO; + + type = be32_to_cpup(p++); + if (type == NFS4_CONTENT_DATA) + count = decode_read_plus_data(xdr, res, &eof); + else + return -EINVAL; + + res->eof = eof; + res->count = count; + return 0; +} + static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res) { int status; @@ -870,6 +981,33 @@ static int nfs4_xdr_dec_deallocate(struct rpc_rqst *rqstp, return status; } +/* + * Decode READ_PLUS request + */ +static int nfs4_xdr_dec_read_plus(struct rpc_rqst *rqstp, + struct xdr_stream *xdr, + void *data) +{ + struct nfs_pgio_res *res = data; + 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 */ diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 64bbb0d0ff5a..60b1ec684751 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -69,6 +69,10 @@ #include "nfs4trace.h" +#ifdef CONFIG_NFS_V4_2 +#include "nfs42.h" +#endif /* CONFIG_NFS_V4_2 */ + #define NFSDBG_FACILITY NFSDBG_PROC #define NFS4_BITMASK_SZ 3 @@ -5195,9 +5199,15 @@ 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)) @@ -5208,13 +5218,28 @@ 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; if (!hdr->pgio_done_cb) 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, 0); } @@ -9957,7 +9982,8 @@ static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = { | NFS_CAP_SEEK | NFS_CAP_LAYOUTSTATS | NFS_CAP_CLONE - | NFS_CAP_LAYOUTERROR, + | NFS_CAP_LAYOUTERROR + | NFS_CAP_READ_PLUS, .init_client = nfs41_init_client, .shutdown_client = nfs41_shutdown_client, .match_stateid = nfs41_match_stateid, diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index 02890606e14a..dd81c9ddd0fb 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -7593,6 +7593,7 @@ const struct rpc_procinfo nfs4_procedures[] = { PROC42(COPY_NOTIFY, enc_copy_notify, dec_copy_notify), PROC(LOOKUPP, enc_lookupp, dec_lookupp), PROC42(LAYOUTERROR, enc_layouterror, dec_layouterror), + PROC42(READ_PLUS, enc_read_plus, dec_read_plus), }; static unsigned int nfs_version4_counts[ARRAY_SIZE(nfs4_procedures)]; diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index 82d8fb422092..c1eeef52545c 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -540,8 +540,8 @@ enum { NFSPROC4_CLNT_LOOKUPP, NFSPROC4_CLNT_LAYOUTERROR, - NFSPROC4_CLNT_COPY_NOTIFY, + NFSPROC4_CLNT_READ_PLUS, }; /* nfs41 types */ diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index 465fa98258a3..11248c5a7b24 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -281,5 +281,6 @@ struct nfs_server { #define NFS_CAP_OFFLOAD_CANCEL (1U << 25) #define NFS_CAP_LAYOUTERROR (1U << 26) #define NFS_CAP_COPY_NOTIFY (1U << 27) +#define NFS_CAP_READ_PLUS (1U << 28) #endif diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index bb8652792b84..412297a10878 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -655,7 +655,7 @@ struct nfs_pgio_args { struct nfs_pgio_res { struct nfs4_sequence_res seq_res; struct nfs_fattr * fattr; - __u32 count; + __u64 count; __u32 op_status; union { struct { -- 2.24.1