Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx11.netapp.com ([216.240.18.76]:16166 "EHLO mx11.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754256AbaIBRbG (ORCPT ); Tue, 2 Sep 2014 13:31:06 -0400 From: Anna Schumaker To: , Subject: [PATCH v2] NFS: Implement SEEK Date: Tue, 2 Sep 2014 13:31:00 -0400 Message-ID: <1409679060-32313-2-git-send-email-Anna.Schumaker@Netapp.com> In-Reply-To: <1409679060-32313-1-git-send-email-Anna.Schumaker@Netapp.com> References: <1409679060-32313-1-git-send-email-Anna.Schumaker@Netapp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Anna Schumaker The SEEK operation is used when an application makes an lseek call with either the SEEK_HOLE or SEEK_DATA flags set. I fall back on nfs_file_llseek() if the server does not have SEEK support. Signed-off-by: Anna Schumaker --- fs/nfs/Makefile | 1 + fs/nfs/inode.c | 2 + fs/nfs/nfs42.h | 14 +++++++ fs/nfs/nfs42proc.c | 39 +++++++++++++++++++ fs/nfs/nfs42xdr.h | 98 +++++++++++++++++++++++++++++++++++++++++++++++ fs/nfs/nfs4_fs.h | 7 ++++ fs/nfs/nfs4client.c | 2 + fs/nfs/nfs4file.c | 68 ++++++++++++++++++++++++++++++++ fs/nfs/nfs4proc.c | 1 - fs/nfs/nfs4xdr.c | 7 ++++ fs/nfsd/nfs4proc.c | 2 +- include/linux/nfs4.h | 3 ++ include/linux/nfs_fs_sb.h | 1 + include/linux/nfs_xdr.h | 19 +++++++++ 14 files changed, 262 insertions(+), 2 deletions(-) create mode 100644 fs/nfs/nfs42.h create mode 100644 fs/nfs/nfs42proc.c create mode 100644 fs/nfs/nfs42xdr.h diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile index 4782e08..04cb830 100644 --- a/fs/nfs/Makefile +++ b/fs/nfs/Makefile @@ -28,6 +28,7 @@ nfsv4-y := nfs4proc.o nfs4xdr.o nfs4state.o nfs4renewd.o nfs4super.o nfs4file.o nfsv4-$(CONFIG_NFS_USE_LEGACY_DNS) += cache_lib.o nfsv4-$(CONFIG_SYSCTL) += nfs4sysctl.o nfsv4-$(CONFIG_NFS_V4_1) += pnfs.o pnfs_dev.o +nfsv4-$(CONFIG_NFS_V4_2) += nfs42proc.o obj-$(CONFIG_PNFS_FILE_LAYOUT) += filelayout/ obj-$(CONFIG_PNFS_OBJLAYOUT) += objlayout/ diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index 577a36f..56d073e 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -716,6 +716,7 @@ struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx) kfree(new); return res; } +EXPORT_SYMBOL_GPL(nfs_get_lock_context); void nfs_put_lock_context(struct nfs_lock_context *l_ctx) { @@ -728,6 +729,7 @@ void nfs_put_lock_context(struct nfs_lock_context *l_ctx) spin_unlock(&inode->i_lock); kfree(l_ctx); } +EXPORT_SYMBOL_GPL(nfs_put_lock_context); /** * nfs_close_context - Common close_context() routine NFSv2/v3 diff --git a/fs/nfs/nfs42.h b/fs/nfs/nfs42.h new file mode 100644 index 0000000..9eecdf2 --- /dev/null +++ b/fs/nfs/nfs42.h @@ -0,0 +1,14 @@ +/* + * Copyright (c) 2014 Anna Schumaker + */ + +#ifndef __LINUX_FS_NFS_NFS4_2_H +#define __LINUX_FS_NFS_NFS4_2_H + +/* nfs4.2proc.c */ +loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int); + +/* nfs4.2xdr.h */ +extern struct rpc_procinfo nfs4_2_procedures[]; + +#endif /* __LINUX_FS_NFS_NFS4_2_H */ diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c new file mode 100644 index 0000000..4c0703f --- /dev/null +++ b/fs/nfs/nfs42proc.c @@ -0,0 +1,39 @@ +/* + * Copyright (c) 2014 Anna Schumaker + */ +#include +#include +#include +#include +#include +#include +#include +#include "nfs4_fs.h" +#include "nfs42.h" + + +loff_t nfs42_proc_llseek(struct inode *inode, nfs4_stateid *stateid, + loff_t offset, int whence) +{ + struct nfs42_seek_args args = { + .sa_fh = NFS_FH(inode), + .sa_stateid = stateid, + .sa_offset = offset, + .sa_what = (whence == SEEK_HOLE) ? + NFS4_CONTENT_HOLE : NFS4_CONTENT_DATA, + }; + struct nfs42_seek_res res; + struct rpc_message msg = { + .rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEEK], + .rpc_argp = &args, + .rpc_resp = &res, + }; + struct nfs_server *server = NFS_SERVER(inode); + int status; + + status = nfs4_call_sync(server->client, server, &msg, + &args.seq_args, &res.seq_res, 0); + if (status) + return status; + return res.sr_offset; +} diff --git a/fs/nfs/nfs42xdr.h b/fs/nfs/nfs42xdr.h new file mode 100644 index 0000000..a30cb3a --- /dev/null +++ b/fs/nfs/nfs42xdr.h @@ -0,0 +1,98 @@ +/* + * Copyright (c) 2014 Anna Schumaker + */ +#ifndef __LINUX_FS_NFS_NFS4_2XDR_H +#define __LINUX_FS_NFS_NFS4_2XDR_H + +#define encode_seek_maxsz (op_encode_hdr_maxsz + \ + XDR_QUADLEN(NFS4_STATEID_SIZE) + \ + 2 /* offset */ + \ + 1 /* whence */) +#define decode_seek_maxsz (op_decode_hdr_maxsz + \ + 1 /* eof */ + \ + 1 /* whence */ + \ + 2 /* offset */ + \ + 2 /* length */) + +#define NFS4_enc_seek_sz (compound_encode_hdr_maxsz + \ + encode_putfh_maxsz + \ + encode_seek_maxsz) +#define NFS4_dec_seek_sz (compound_decode_hdr_maxsz + \ + decode_putfh_maxsz + \ + decode_seek_maxsz) + + +static void encode_seek(struct xdr_stream *xdr, + struct nfs42_seek_args *args, + struct compound_hdr *hdr) +{ + encode_op_hdr(xdr, OP_SEEK, decode_seek_maxsz, hdr); + encode_nfs4_stateid(xdr, args->sa_stateid); + encode_uint64(xdr, args->sa_offset); + encode_uint32(xdr, args->sa_what); +} + +/* + * Encode SEEK request + */ +static void nfs4_xdr_enc_seek(struct rpc_rqst *req, + struct xdr_stream *xdr, + struct nfs42_seek_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->sa_fh, &hdr); + encode_seek(xdr, args, &hdr); + encode_nops(&hdr); +} + +static int decode_seek(struct xdr_stream *xdr, struct nfs42_seek_res *res) +{ + int status; + __be32 *p; + + status = decode_op_hdr(xdr, OP_SEEK); + if (status) + return status; + + p = xdr_inline_decode(xdr, 12); + if (unlikely(!p)) + goto out_overflow; + + res->sr_eof = be32_to_cpup(p++); + p = xdr_decode_hyper(p, &res->sr_offset); + return 0; + +out_overflow: + print_overflow_msg(__func__, xdr); + return -EIO; +} + +/* + * Decode SEEK request + */ +static int nfs4_xdr_dec_seek(struct rpc_rqst *rqstp, + struct xdr_stream *xdr, + struct nfs42_seek_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_seek(xdr, res); +out: + return status; +} +#endif /* __LINUX_FS_NFS_NFS4_2XDR_H */ diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h index 92193ed..ec1078f 100644 --- a/fs/nfs/nfs4_fs.h +++ b/fs/nfs/nfs4_fs.h @@ -227,6 +227,9 @@ int nfs4_replace_transport(struct nfs_server *server, const struct nfs4_fs_locations *locations); /* nfs4proc.c */ +extern int nfs4_call_sync(struct rpc_clnt *, struct nfs_server *, + struct rpc_message *, struct nfs4_sequence_args *, + struct nfs4_sequence_res *, int); extern int nfs4_proc_setclientid(struct nfs_client *, u32, unsigned short, struct rpc_cred *, struct nfs4_setclientid_res *); extern int nfs4_proc_setclientid_confirm(struct nfs_client *, struct nfs4_setclientid_res *arg, struct rpc_cred *); extern int nfs4_proc_get_rootfh(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *, bool); @@ -364,6 +367,10 @@ nfs4_state_protect_write(struct nfs_client *clp, struct rpc_clnt **clntp, } #endif /* CONFIG_NFS_V4_1 */ +#ifdef CONFIG_NFS_V4_2 +loff_t nfs42_proc_llseek(struct inode *, nfs4_stateid *, loff_t, int); +#endif /* CONFIG_NFS_V4_2 */ + extern const struct nfs4_minor_version_ops *nfs_v4_minor_ops[]; extern const u32 nfs4_fattr_bitmap[3]; diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c index 53e435a..f914797 100644 --- a/fs/nfs/nfs4client.c +++ b/fs/nfs/nfs4client.c @@ -931,6 +931,8 @@ static int nfs4_server_common_setup(struct nfs_server *server, server->client->cl_auth->au_flavor == RPC_AUTH_UNIX) server->caps |= NFS_CAP_UIDGID_NOMAP; + if (server->nfs_client->cl_minorversion >= 2) + server->caps |= NFS_CAP_SEEK; /* Probe the root fh to retrieve its FSID and filehandle */ error = nfs4_get_rootfh(server, mntfh, auth_probe); diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index a816f06..6702f99 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -8,6 +8,10 @@ #include "fscache.h" #include "pnfs.h" +#ifdef CONFIG_NFS_V4_2 +#include "nfs42.h" +#endif + #define NFSDBG_FACILITY NFSDBG_FILE static int @@ -115,8 +119,72 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) return ret; } +#ifdef CONFIG_NFS_V4_2 +static int nfs42_select_stateid(struct file *file, nfs4_stateid *stateid, fmode_t mode) +{ + struct nfs_open_context *open; + struct nfs_lock_context *lock; + int ret; + + open = nfs_file_open_context(file); + if (!open) + return -EBADF; + + lock = nfs_get_lock_context(open); + if (IS_ERR(lock)) + return PTR_ERR(lock); + + ret = nfs4_set_rw_stateid(stateid, open, lock, mode); + + if (lock) + nfs_put_lock_context(lock); + return ret; +} + +static loff_t nfs42_file_llseek(struct file *filep, loff_t offset, int whence) +{ + struct inode *inode = file_inode(filep); + nfs4_stateid stateid; + loff_t pos; + int err; + + err = nfs42_select_stateid(filep, &stateid, FMODE_READ | FMODE_WRITE); + if (err < 0) + return err; + + nfs_wb_all(inode); + pos = nfs42_proc_llseek(inode, &stateid, offset, whence); + if (pos < 0) + return pos; + return vfs_setpos(filep, pos, inode->i_sb->s_maxbytes); +} + +static loff_t nfs4_file_llseek(struct file *filep, loff_t offset, int whence) +{ + struct nfs_server *server = NFS_SERVER(file_inode(filep)); + loff_t ret; + + switch (whence) { + case SEEK_HOLE: + case SEEK_DATA: + if (server->caps & NFS_CAP_SEEK) { + ret = nfs42_file_llseek(filep, offset, whence); + if (ret != -ENOTSUPP) + return ret; + server->caps &= ~NFS_CAP_SEEK; + } + default: + return nfs_file_llseek(filep, offset, whence); + } +} +#endif /* CONFIG_NFS_V4_2 */ + const struct file_operations nfs4_file_operations = { +#ifdef CONFIG_NFS_V4_2 + .llseek = nfs4_file_llseek, +#else .llseek = nfs_file_llseek, +#endif .read = new_sync_read, .write = new_sync_write, .read_iter = nfs_file_read, diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 18eb31c..bc8b7e4 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -875,7 +875,6 @@ static int nfs4_call_sync_sequence(struct rpc_clnt *clnt, return ret; } -static int nfs4_call_sync(struct rpc_clnt *clnt, struct nfs_server *server, struct rpc_message *msg, diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c index e13b59d..6b94428 100644 --- a/fs/nfs/nfs4xdr.c +++ b/fs/nfs/nfs4xdr.c @@ -7427,6 +7427,10 @@ nfs4_stat_to_errno(int stat) return -stat; } +#if defined(CONFIG_NFS_V4_2) +#include "nfs42xdr.h" +#endif /* CONFIG_NFS_V4_2 */ + #define PROC(proc, argtype, restype) \ [NFSPROC4_CLNT_##proc] = { \ .p_proc = NFSPROC4_COMPOUND, \ @@ -7495,6 +7499,9 @@ struct rpc_procinfo nfs4_procedures[] = { enc_bind_conn_to_session, dec_bind_conn_to_session), PROC(DESTROY_CLIENTID, enc_destroy_clientid, dec_destroy_clientid), #endif /* CONFIG_NFS_V4_1 */ +#if defined(CONFIG_NFS_V4_2) + PROC(SEEK, enc_seek, dec_seek), +#endif /* CONFIG_NFS_V4_2 */ }; const struct rpc_version nfs_version4 = { diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index aed5b88..9fd2b78 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1018,7 +1018,7 @@ nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, struct nfsd4_seek *seek) { struct file *file; - __be32 status = nfs_ok; + __be32 status; status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate, &seek->seek_stateid, diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index 026b0c0..356acc2 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -487,6 +487,9 @@ enum { NFSPROC4_CLNT_GETDEVICELIST, NFSPROC4_CLNT_BIND_CONN_TO_SESSION, NFSPROC4_CLNT_DESTROY_CLIENTID, + + /* nfs42 */ + NFSPROC4_CLNT_SEEK, }; /* nfs41 types */ diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h index 922be2e..a32ba0d 100644 --- a/include/linux/nfs_fs_sb.h +++ b/include/linux/nfs_fs_sb.h @@ -230,5 +230,6 @@ struct nfs_server { #define NFS_CAP_STATEID_NFSV41 (1U << 16) #define NFS_CAP_ATOMIC_OPEN_V1 (1U << 17) #define NFS_CAP_SECURITY_LABEL (1U << 18) +#define NFS_CAP_SEEK (1U << 19) #endif diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 0040629..9724257 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -1239,6 +1239,25 @@ struct pnfs_ds_commit_info { #endif /* CONFIG_NFS_V4_1 */ +#ifdef CONFIG_NFS_V4_2 +struct nfs42_seek_args { + struct nfs4_sequence_args seq_args; + + struct nfs_fh *sa_fh; + nfs4_stateid *sa_stateid; + u64 sa_offset; + u32 sa_what; +}; + +struct nfs42_seek_res { + struct nfs4_sequence_res seq_res; + unsigned int status; + + u32 sr_eof; + u64 sr_offset; +}; +#endif + struct nfs_page; #define NFS_PAGEVEC_SIZE (8U) -- 2.1.0