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From: schumaker.anna@gmail.com
To: Trond.Myklebust@hammerspace.com, linux-nfs@vger.kernel.org
Cc: Anna.Schumaker@Netapp.com
Subject: [PATCH v2 5/6] NFS: Add READ_PLUS hole segment decoding
Date: Fri, 14 Feb 2020 16:12:26 -0500
Message-ID: <20200214211227.407836-6-Anna.Schumaker@Netapp.com> (raw)
In-Reply-To: <20200214211227.407836-1-Anna.Schumaker@Netapp.com>

From: Anna Schumaker <Anna.Schumaker@Netapp.com>

We keep things simple for now by only decoding a single hole or data
segment returned by the server, even if they returned more to us.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
 fs/nfs/nfs42xdr.c | 32 ++++++++++++++++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index bf118ecabe2c..3407a3cf2e13 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -47,7 +47,7 @@
 #define decode_deallocate_maxsz		(op_decode_hdr_maxsz)
 #define encode_read_plus_maxsz		(op_encode_hdr_maxsz + \
 					 encode_stateid_maxsz + 3)
-#define NFS42_READ_PLUS_SEGMENT_SIZE	(1 /* data_content4 */ + \
+#define NFS42_READ_PLUS_SEGMENT_SIZE	(2 /* data_content4 */ + \
 					 2 /* data_info4.di_offset */ + \
 					 2 /* data_info4.di_length */)
 #define decode_read_plus_maxsz		(op_decode_hdr_maxsz + \
@@ -771,6 +771,31 @@ static uint32_t decode_read_plus_data(struct xdr_stream *xdr, struct nfs_pgio_re
 	return count;
 }
 
+static uint32_t decode_read_plus_hole(struct xdr_stream *xdr, struct nfs_pgio_res *res,
+				      uint32_t *eof)
+{
+	__be32 *p;
+	uint64_t offset, length;
+	size_t recvd;
+
+	p = xdr_inline_decode(xdr, 8 + 8);
+	if (unlikely(!p))
+		return -EIO;
+
+	p = xdr_decode_hyper(p, &offset);
+	p = xdr_decode_hyper(p, &length);
+	if (length == 0)
+		return 0;
+
+	recvd = xdr_expand_hole(xdr, 0, length);
+	if (recvd < length) {
+		*eof = 0;
+		length = recvd;
+	}
+
+	return length;
+}
+
 static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
 {
 	__be32 *p;
@@ -798,7 +823,10 @@ static int decode_read_plus(struct xdr_stream *xdr, struct nfs_pgio_res *res)
 	if (type == NFS4_CONTENT_DATA)
 		count = decode_read_plus_data(xdr, res, &eof);
 	else
-		return -EINVAL;
+		count = decode_read_plus_hole(xdr, res, &eof);
+
+	if (segments > 1)
+		eof = 0;
 
 	res->eof = eof;
 	res->count = count;
-- 
2.25.0


  parent reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 21:12 [PATCH v2 0/6] NFS: Add support for the v4.2 READ_PLUS operation schumaker.anna
2020-02-14 21:12 ` [PATCH v2 1/6] SUNRPC: Split out a function for setting current page schumaker.anna
2020-02-14 21:12 ` [PATCH v2 2/6] SUNRPC: Add the ability to expand holes in data pages schumaker.anna
2020-02-14 21:12 ` [PATCH v2 3/6] SUNRPC: Add the ability to shift data to a specific offset schumaker.anna
2020-02-14 21:12 ` [PATCH v2 4/6] NFS: Add READ_PLUS data segment support schumaker.anna
2020-02-14 22:28   ` Chuck Lever
2020-02-20 14:42     ` Anna Schumaker
2020-02-20 14:55       ` Chuck Lever
2020-02-20 18:28         ` Anna Schumaker
2020-02-20 18:30           ` Chuck Lever
2020-02-20 18:35             ` Anna Schumaker
2020-02-20 18:54               ` Chuck Lever
2020-02-14 21:12 ` schumaker.anna [this message]
2020-02-14 21:12 ` [PATCH v2 6/6] NFS: Decode multiple READ_PLUS segments schumaker.anna
2020-02-20 17:40 ` [PATCH v2 0/6] NFS: Add support for the v4.2 READ_PLUS operation Chuck Lever
2020-02-20 18:25   ` Anna Schumaker
2020-02-20 18:29     ` Chuck Lever

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