Return-Path: linux-nfs-owner@vger.kernel.org Received: from mx11.netapp.com ([216.240.18.76]:7409 "EHLO mx11.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754801Ab3KNQ1J (ORCPT ); Thu, 14 Nov 2013 11:27:09 -0500 Message-ID: <5284F992.3010104@netapp.com> Date: Thu, 14 Nov 2013 11:25:54 -0500 From: Anna Schumaker MIME-Version: 1.0 To: Weston Andros Adamson , "Schumaker, Bryan" CC: Bruce Fields , linux-nfs list Subject: [PATCH v4 3/3] NFSD: Implement SEEK References: <1384371057-16454-1-git-send-email-bjschuma@netapp.com> <1384371057-16454-4-git-send-email-bjschuma@netapp.com> <5000397E-1879-4ED1-B761-8C7BB8D87F81@netapp.com> In-Reply-To: <5000397E-1879-4ED1-B761-8C7BB8D87F81@netapp.com> Content-Type: text/plain; charset="windows-1252" Sender: linux-nfs-owner@vger.kernel.org List-ID: This patch adds in the SEEK operation used by clients doing an llseek on a file to find either hole or data segments. I am making the assumption that allocated == true in the NFS4_CONTENT_DATA case and false for the NFS4_CONTENT_HOLE case. Signed-off-by: Anna Schumaker --- The first two patches in the series haven't changed, so I'm only resubmitting this one :) Changed in V4: - Remove unnecessary "else" (thanks Dros!) - Correct the switch statement now that I understand the spec better fs/nfsd/Kconfig | 12 +++++++++++ fs/nfsd/nfs4proc.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++ fs/nfsd/nfs4xdr.c | 48 ++++++++++++++++++++++++++++++++++++++++++++ fs/nfsd/xdr4.h | 16 +++++++++++++++ include/linux/nfs4.h | 6 ++++++ 5 files changed, 138 insertions(+) diff --git a/fs/nfsd/Kconfig b/fs/nfsd/Kconfig index dc8f1ef..680e017 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 419572f..89bde5a 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -1028,6 +1028,55 @@ 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; + loff_t end_pos = 0; + __be32 status; + + nfs4_lock_state(); + status = nfs4_preprocess_stateid_op(SVC_NET(rqstp), cstate, + &seek->seek_stateid, + RD_STATE | WR_STATE, &file); + if (status != nfs_ok) { + nfs4_unlock_state(); + return status; + } + + get_file(file); + nfs4_unlock_state(); + + switch (seek->seek_whence) { + case NFS4_CONTENT_DATA: + seek->seek_pos = vfs_llseek(file, seek->seek_offset, SEEK_DATA); + end_pos = vfs_llseek(file, seek->seek_pos, SEEK_HOLE); + seek->seek_allocated = true; + break; + case NFS4_CONTENT_HOLE: + seek->seek_pos = vfs_llseek(file, seek->seek_offset, SEEK_HOLE); + end_pos = vfs_llseek(file, seek->seek_pos, SEEK_DATA); + seek->seek_allocated = false; + break; + default: + status = nfserr_union_notsupp; + goto out; + } + + status = nfs_ok; + if (seek->seek_pos < 0) + status = nfserrno(seek->seek_pos); + else + seek->seek_length = end_pos - seek->seek_pos; + +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 @@ -1840,6 +1889,13 @@ static struct nfsd4_operation nfsd4_ops[] = { .op_get_currentstateid = (stateid_getter)nfsd4_get_freestateid, .op_rsize_bop = (nfsd4op_rsize)nfsd4_only_status_rsize, }, + +#ifdef CONFIG_NFSD_V4_2_SEEK + [OP_SEEK] = { + .op_func = (nfsd4op_func)nfsd4_seek, + .op_name = "OP_SEEK", + }, +#endif /* CONFIG_NFSD_V4_2_SEEK */ }; #ifdef NFSD_DEBUG diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 3af6c46..7041039 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -1507,6 +1507,24 @@ 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); + READ64(seek->seek_offset); + READ32(seek->seek_whence); + + DECODE_TAIL; +} +#endif /* CONFIG_NFSD_V4_2_SEEK */ + static __be32 nfsd4_decode_noop(struct nfsd4_compoundargs *argp, void *p) { @@ -1589,7 +1607,11 @@ static nfsd4_dec nfsd4_dec_ops[] = { [OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp, [OP_WRITE_PLUS] = (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_IO_ADVISE] = (nfsd4_dec)nfsd4_decode_notsupp, }; @@ -3514,6 +3536,28 @@ 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; + + RESERVE_SPACE(28); + WRITE32(seek->seek_eof); + WRITE32(seek->seek_whence); + WRITE64(seek->seek_pos); + WRITE64(seek->seek_length); + WRITE32(seek->seek_allocated); + ADJUST_ARGS(); + + return nfserr; +} +#endif /* CONFIG_NFSD_V4_2_SEEK */ + static __be32 nfsd4_encode_noop(struct nfsd4_compoundres *resp, __be32 nfserr, void *p) { @@ -3595,7 +3639,11 @@ static nfsd4_enc nfsd4_enc_ops[] = { [OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop, [OP_WRITE_PLUS] = (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_IO_ADVISE] = (nfsd4_enc)nfsd4_encode_noop, }; diff --git a/fs/nfsd/xdr4.h b/fs/nfsd/xdr4.h index b3ed644..c2f4e30 100644 --- a/fs/nfsd/xdr4.h +++ b/fs/nfsd/xdr4.h @@ -430,6 +430,19 @@ struct nfsd4_reclaim_complete { u32 rca_one_fs; }; +struct nfsd4_seek { + /* request */ + stateid_t seek_stateid; + loff_t seek_offset; + u32 seek_whence; + + /* response */ + u64 seek_pos; + u32 seek_eof; + u64 seek_length; + u32 seek_allocated; +}; + struct nfsd4_op { int opnum; __be32 status; @@ -475,6 +488,9 @@ 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 e58e0eb..a35b0b6 100644 --- a/include/linux/nfs4.h +++ b/include/linux/nfs4.h @@ -558,4 +558,10 @@ struct nfs4_deviceid { char data[NFS4_DEVICEID4_SIZE]; }; +enum data_content4 { + NFS4_CONTENT_DATA = 0, + NFS4_CONTENT_APP_DATA_HOLE = 1, + NFS4_CONTENT_HOLE = 2, +}; + #endif -- 1.8.4.2