From: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
This patch adds READ_PLUS support by encoding file contents ase one
single data segment, matching the behavior of the READ operation.
Signed-off-by: Anna Schumaker <Anna.Schumaker@xxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 16 +++++++++++
fs/nfsd/nfs4xdr.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 93 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index ac71d13..fdf9ce3 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -1603,6 +1603,16 @@ static inline u32 nfsd4_read_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
return (op_encode_hdr_size + 2 + XDR_QUADLEN(rlen)) * sizeof(__be32);
}
+static inline u32 nfsd4_read_plus_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
+{
+ u32 maxcount = svc_max_payload(rqstp);
+ u32 rlen = min(op->u.read.rd_length, maxcount);
+ /* extra xdr space for encoding read plus segments. */
+ u32 xdr = 4;
+
+ return (op_encode_hdr_size + 2 + xdr + XDR_QUADLEN(rlen)) * sizeof(__be32);
+}
+
static inline u32 nfsd4_readdir_rsize(struct svc_rqst *rqstp, struct nfsd4_op *op)
{
u32 maxcount = 0, rlen = 0;
@@ -1980,6 +1990,12 @@ static struct nfsd4_operation nfsd4_ops[] = {
.op_name = "OP_DEALLOCATE",
.op_rsize_bop = (nfsd4op_rsize)nfsd4_write_rsize,
},
+ [OP_READ_PLUS] = {
+ .op_func = (nfsd4op_func)nfsd4_read,
+ .op_name = "OP_READ_PLUS",
+ .op_rsize_bop = (nfsd4op_rsize)nfsd4_read_plus_rsize,
+ .op_get_currentstateid = (stateid_getter)nfsd4_get_readstateid,
+ },
[OP_SEEK] = {
.op_func = (nfsd4op_func)nfsd4_seek,
.op_name = "OP_SEEK",
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 01248b2..480b07f 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -1630,7 +1630,7 @@ static nfsd4_dec nfsd4_dec_ops[] = {
[OP_LAYOUTSTATS] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_OFFLOAD_CANCEL] = (nfsd4_dec)nfsd4_decode_notsupp,
[OP_OFFLOAD_STATUS] = (nfsd4_dec)nfsd4_decode_notsupp,
- [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_notsupp,
+ [OP_READ_PLUS] = (nfsd4_dec)nfsd4_decode_read,
[OP_SEEK] = (nfsd4_dec)nfsd4_decode_seek,
[OP_WRITE_SAME] = (nfsd4_dec)nfsd4_decode_notsupp,
};
@@ -3802,6 +3802,81 @@ nfsd4_encode_test_stateid(struct nfsd4_compoundres *resp, __be32 nfserr,
}
static __be32
+nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp, struct nfsd4_read *read,
+ struct file *file)
+{
+ __be32 *p, err;
+ unsigned long maxcount;
+ struct xdr_stream *xdr = &resp->xdr;
+
+ p = xdr_reserve_space(xdr, 4 + 8 + 4); /* content type, offset, maxcount */
+ if (!p)
+ return nfserr_resource;
+ xdr_commit_encode(xdr);
+
+ maxcount = svc_max_payload(resp->rqstp);
+ maxcount = min_t(unsigned long, maxcount, (xdr->buf->buflen - xdr->buf->len));
+ maxcount = min_t(unsigned long, maxcount, read->rd_length);
+
+ err = nfsd4_encode_readv(resp, read, file, &maxcount);
+
+ *p++ = cpu_to_be32(NFS4_CONTENT_DATA);
+ p = xdr_encode_hyper(p, read->rd_offset);
+ *p++ = cpu_to_be32(maxcount);
+
+ read->rd_offset += maxcount;
+ return err;
+}
+
+static __be32
+nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
+ struct nfsd4_read *read)
+{
+ struct xdr_stream *xdr = &resp->xdr;
+ struct file *file = read->rd_filp;
+ int starting_len = xdr->buf->len;
+ struct raparms *ra;
+ __be32 *p;
+ __be32 err;
+ u32 eof, segments = 0;
+
+ if (nfserr)
+ return nfserr;
+
+ /* eof flag, segment count */
+ p = xdr_reserve_space(xdr, 4 + 4 );
+ if (!p)
+ return nfserr_resource;
+ xdr_commit_encode(xdr);
+
+ if (!read->rd_filp) {
+ err = nfsd_get_tmp_read_open(resp->rqstp, read->rd_fhp,
+ &file, &ra);
+ if (err)
+ goto err_truncate;
+ }
+
+ if (read->rd_offset >= i_size_read(file_inode(file)))
+ goto out_encode;
+
+ err = nfsd4_encode_read_plus_data(resp, read, file);
+ segments++;
+
+out_encode:
+ eof = (read->rd_offset >= i_size_read(file_inode(file)));
+ *p++ = cpu_to_be32(eof);
+ *p++ = cpu_to_be32(segments);
+
+ if (!read->rd_filp)
+ nfsd_put_tmp_read_open(file, ra);
+
+err_truncate:
+ if (err)
+ xdr_truncate_encode(xdr, starting_len);
+ return err;
+}
+
+static __be32
nfsd4_encode_seek(struct nfsd4_compoundres *resp, __be32 nfserr,
struct nfsd4_seek *seek)
{
@@ -3900,7 +3975,7 @@ static nfsd4_enc nfsd4_enc_ops[] = {
[OP_LAYOUTSTATS] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OFFLOAD_CANCEL] = (nfsd4_enc)nfsd4_encode_noop,
[OP_OFFLOAD_STATUS] = (nfsd4_enc)nfsd4_encode_noop,
- [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_noop,
+ [OP_READ_PLUS] = (nfsd4_enc)nfsd4_encode_read_plus,
[OP_SEEK] = (nfsd4_enc)nfsd4_encode_seek,
[OP_WRITE_SAME] = (nfsd4_enc)nfsd4_encode_noop,
};
--
2.2.2
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
