Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx11.netapp.com ([216.240.18.76]:49997 "EHLO mx11.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933852AbaH0PSH (ORCPT ); Wed, 27 Aug 2014 11:18:07 -0400 From: To: CC: Subject: [PATCH 3/3] NFSD: Implement SEEK Date: Wed, 27 Aug 2014 11:17:58 -0400 Message-ID: <1409152678-7806-4-git-send-email-bjschuma@netapp.com> In-Reply-To: <1409152678-7806-1-git-send-email-bjschuma@netapp.com> References: <1409152678-7806-1-git-send-email-bjschuma@netapp.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-nfs-owner@vger.kernel.org List-ID: From: Anna Schumaker This patch adds server support for the NFS v4.2 operation SEEK, which returns the position of the next hole or data segment in a file. This operation is off by default, and needs CONFIG_NFSD_V4_2_SEEK=y to be compiled. Signed-off-by: Anna Schumaker --- fs/nfsd/Kconfig | 12 ++++++++++++ fs/nfsd/nfs4proc.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++ fs/nfsd/nfs4xdr.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ fs/nfsd/xdr4.h | 14 ++++++++++++++ include/linux/nfs4.h | 5 +++++ 5 files changed, 123 insertions(+) diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig index f994e75..804b20a 100644 --- a/fs/nfsd/Kconfig +++ b/fs/nfsd/Kconfig @@ -81,6 +81,18 @@ config NFSD_V4 If unsure, say N. +config NFSD_V4_2_SEEK + bool "Enable SEEK support for the NFS v4.2 server" + depends on NFSD_V4 + help + Say Y here if you want to enable support for the NFS v4.2 operation + SEEK, which adds in SEEK_HOLE and SEEK_DATA support. + + WARNING: there is still a chance of backwards-incompatible protocol + changes. This feature is targeted at developers and testers only. + + If unsure, say N. + config NFSD_V4_SECURITY_LABEL bool "Provide Security Label support for NFSv4 server" depends on NFSD_V4 && SECURITY diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 5e0dc52..f555eb2 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1013,6 +1013,45 @@ nfsd4_write(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, return status; } +#ifdef CONFIG_NFSD_V4_2_SEEK +static __be32 +nfsd4_seek(struct svc_rqst *rqstp, struct nfsd4_compound_state *cstate, + struct nfsd4_seek *seek) +{ + struct file *file; + __be32 status = nfs_ok; + + status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate, + &seek->seek_stateid, + RD_STATE | WR_STATE, &file); + if (status) { + dprintk("NFSD: nfsd4_seek: couldn't process stateid!\n"); + return status; + } + + switch (seek->seek_whence) { + case NFS4_CONTENT_DATA: + seek->seek_pos = vfs_llseek(file, seek->seek_offset, SEEK_DATA); + break; + case NFS4_CONTENT_HOLE: + seek->seek_pos = vfs_llseek(file, seek->seek_offset, SEEK_HOLE); + break; + default: + status = nfserr_union_notsupp; + goto out; + } + + if (seek->seek_pos < 0) + status = nfserrno(seek->seek_pos); + else if (seek->seek_pos >= i_size_read(file_inode(file))) + seek->seek_eof = true; + +out: + fput(file); + return status; +} +#endif /* CONFIG_NFSD_V4_2_SEEK */ + /* This routine never returns NFS_OK! If there are no other errors, it * will return NFSERR_SAME or NFSERR_NOT_SAME depending on whether the * attributes matched. VERIFY is implemented by mapping NFSERR_SAME @@ -1881,6 +1920,14 @@ static struct nfsd4_operation nfsd4_ops[] = { .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid, .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize, }, + + /* NFSv4.2 operations */ +#ifdef CONFIG_NFSD_V4_2_SEEK + [OP_SEEK] = { + .op_func = (nfsd4op_func)nfsd4_seek, + .op_name = "OP_SEEK", + }, +#endif /* CONFIG_NFSD_V4_2_SEEK */ }; int nfsd4_max_reply(struct svc_rqst *rqstp, struct nfsd4_op *op) diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 94dde7b..5bedeb3 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1520,6 +1520,24 @@ static __be32 nfsd4_decode_reclaim_complete(struct nfsd4_compoundargs *argp, str DECODE_TAIL; } +#ifdef CONFIG_NFSD_V4_2_SEEK +static __be32 +nfsd4_decode_seek(struct nfsd4_compoundargs *argp, struct nfsd4_seek *seek) +{ + DECODE_HEAD; + + status = nfsd4_decode_stateid(argp, &seek->seek_stateid); + if (status) + return status; + + READ_BUF(12); + p = xdr_decode_hyper(p, &seek->seek_offset); + seek->seek_whence = be32_to_cpup(p); + + DECODE_TAIL; +} +#endif /* CONFIG_NFSD_V4_2_SEEK */ + static __be32 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) { @@ -1605,7 +1623,11 @@ static nfsd4_dec nfsd4_dec_ops[] = { [OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp, [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp, [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp, +#ifdef CONFIG_NFSD_V4_2_SEEK + [OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek, +#else [OP_SEEK] = (nfsd4_dec)nfsd4_decode_notsupp, +#endif /* CONFIG_NFSD_V4_2_SEEK */ [OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp, }; @@ -3764,6 +3786,24 @@ nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr, return nfserr; } +#ifdef CONFIG_NFSD_V4_2_SEEK +static __be32 +nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr, + struct nfsd4_seek *seek) +{ + __be32 *p; + + if (nfserr) + return nfserr; + + p = xdr_reserve_space(&resp->xdr, 12); + *p++ = cpu_to_be32(seek->seek_eof); + p = xdr_encode_hyper(p, seek->seek_pos); + + return nfserr; +} +#endif /* CONFIG_NFSD_V4_2_SEEK */ + static __be32 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) { @@ -3848,8 +3888,13 @@ static nfsd4_enc nfsd4_enc_ops[] = { [OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop, [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop, [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop, +#ifdef CONFIG_NFSD_V4_2_SEEK + [OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek, +#else [OP_SEEK] = (nfsd4_enc)nfsd4_encode_noop, +#endif /* CONFIG_NFSD_V4_2_SEEK */ [OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop, + [OP_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, }; /* diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h index 465e779..5720e94 100644 --- a/fs/nfsd/xdr4.h +++ b/fs/nfsd/xdr4.h @@ -428,6 +428,17 @@ struct nfsd4_reclaim_complete { u32 rca_one_fs; }; +struct nfsd4_seek { + /* request */ + stateid_t seek_stateid; + loff_t seek_offset; + u32 seek_whence; + + /* response */ + u32 seek_eof; + loff_t seek_pos; +}; + struct nfsd4_op { int opnum; __be32 status; @@ -473,6 +484,9 @@ struct nfsd4_op { struct nfsd4_reclaim_complete reclaim_complete; struct nfsd4_test_stateid test_stateid; struct nfsd4_free_stateid free_stateid; + + /* NFSv4.2 */ + struct nfsd4_seek seek; } u; struct nfs4_replay * replay; }; diff --git a/include/linux/nfs4.h b/include/linux/nfs4.h index cf38224..026b0c0 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -550,4 +550,9 @@ struct nfs4_deviceid { char data[NFS4_DEVICEID4_SIZE]; }; +enum data_content4 { + NFS4_CONTENT_DATA = 0, + NFS4_CONTENT_HOLE = 1, +}; + #endif -- 2.1.0