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[68.32.74.190]) by smtp.gmail.com with ESMTPSA id h23sm1607735ywc.105.2020.01.10.14.35.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 10 Jan 2020 14:35:43 -0800 (PST) From: schumaker.anna@gmail.com X-Google-Original-From: Anna.Schumaker@Netapp.com To: bfields@redhat.com, linux-nfs@vger.kernel.org Cc: Anna.Schumaker@Netapp.com Subject: [PATCH 3/4] NFSD: Add READ_PLUS hole segment encoding Date: Fri, 10 Jan 2020 17:35:37 -0500 Message-Id: <20200110223538.528560-4-Anna.Schumaker@Netapp.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200110223538.528560-1-Anna.Schumaker@Netapp.com> References: <20200110223538.528560-1-Anna.Schumaker@Netapp.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org From: Anna Schumaker However, we only encode the hole if it is at the beginning of the range and treat everything else as data to keep things simple. Signed-off-by: Anna Schumaker --- fs/nfsd/nfs4proc.c | 2 +- fs/nfsd/nfs4xdr.c | 47 ++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 46 insertions(+), 3 deletions(-) diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c index 3c11ca9bd5d7..fc8c821eda8b 100644 --- a/fs/nfsd/nfs4proc.c +++ b/fs/nfsd/nfs4proc.c @@ -2184,7 +2184,7 @@ static inline u32 nfsd4_read_plus_rsize(struct svc_rqst *rqstp, struct nfsd4_op u32 maxcount = svc_max_payload(rqstp); u32 rlen = min(op->u.read.rd_length, maxcount); /* enough extra xdr space for encoding either a hole or data segment. */ - u32 segments = 1 + 2 + 2; + u32 segments = 2 * (1 + 2 + 2); return (op_encode_hdr_size + 2 + segments + XDR_QUADLEN(rlen)) * sizeof(__be32); } diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c index 014e05365c17..552972b35547 100644 --- a/fs/nfsd/nfs4xdr.c +++ b/fs/nfsd/nfs4xdr.c @@ -4302,6 +4302,31 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, return nfserr; } +static __be32 +nfsd4_encode_read_plus_hole(struct nfsd4_compoundres *resp, struct nfsd4_read *read, + unsigned long maxcount, u32 *eof) +{ + struct file *file = read->rd_nf->nf_file; + __be32 *p; + + /* Content type, offset, byte count */ + p = xdr_reserve_space(&resp->xdr, 4 + 8 + 8); + if (!p) + return nfserr_resource; + + maxcount = min_t(unsigned long, maxcount, read->rd_length); + + *p++ = cpu_to_be32(NFS4_CONTENT_HOLE); + p = xdr_encode_hyper(p, read->rd_offset); + p = xdr_encode_hyper(p, maxcount); + + *eof = (read->rd_offset + maxcount) >= i_size_read(file_inode(file)); + + read->rd_offset += maxcount; + read->rd_length = (maxcount > 0) ? read->rd_length - maxcount : 0; + return nfs_ok; +} + static __be32 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, struct nfsd4_read *read) @@ -4311,6 +4336,8 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, struct xdr_stream *xdr = &resp->xdr; struct file *file; int starting_len = xdr->buf->len; + unsigned int segments = 0; + loff_t data_pos; __be32 *p; if (nfserr) @@ -4335,12 +4362,28 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr, (xdr->buf->buflen - xdr->buf->len)); maxcount = min_t(unsigned long, maxcount, read->rd_length); - nfserr = nfsd4_encode_read_plus_data(resp, read, maxcount, &eof); + data_pos = vfs_llseek(file, read->rd_offset, SEEK_DATA); + if (data_pos == -ENXIO) + data_pos = i_size_read(file_inode(file)); + else if (data_pos < 0) + data_pos = read->rd_offset; + + if (data_pos > read->rd_offset) { + nfserr = nfsd4_encode_read_plus_hole(resp, read, + data_pos - read->rd_offset, &eof); + segments++; + } + + if (!nfserr && !eof && read->rd_length > 0) { + nfserr = nfsd4_encode_read_plus_data(resp, read, maxcount, &eof); + segments++; + } + if (nfserr) xdr_truncate_encode(xdr, starting_len); else { *p++ = htonl(eof); - *p++ = htonl(1); + *p++ = htonl(segments); } return nfserr; -- 2.24.1