[PATCH v4 3/5] NFSD: Add READ_PLUS hole segment encoding

[schumaker.anna@gmail.com]

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

However, we still only reply to the READ_PLUS call with a single segment
at this time.

Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
---
 fs/nfsd/nfs4proc.c |  2 +-
 fs/nfsd/nfs4xdr.c  | 40 +++++++++++++++++++++++++++++++++++++++-
 2 files changed, 40 insertions(+), 2 deletions(-)

diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index 9630d33211f2..36305b846f5a 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -2528,7 +2528,7 @@ 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 9af92f538000..2fa39217c256 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -4378,10 +4378,14 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
 	struct xdr_stream *xdr = &resp->xdr;
 	struct file *file = read->rd_nf->nf_file;
 	int starting_len = xdr->buf->len;
+	loff_t hole_pos = vfs_llseek(file, read->rd_offset, SEEK_HOLE);
 	__be32 nfserr;
 	__be32 *p, tmp;
 	__be64 tmp64;
 
+	if (hole_pos > read->rd_offset)
+		maxcount = min_t(unsigned long, maxcount, hole_pos - read->rd_offset);
+
 	/* Content type, offset, byte count */
 	p = xdr_reserve_space(xdr, 4 + 8 + 4);
 	if (!p)
@@ -4405,6 +4409,27 @@ nfsd4_encode_read_plus_data(struct nfsd4_compoundres *resp,
 	return nfs_ok;
 }
 
+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;
+
+	*p++ = htonl(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));
+	return nfs_ok;
+}
+
 static __be32
 nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
 		       struct nfsd4_read *read)
@@ -4415,6 +4440,7 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
 	int starting_len = xdr->buf->len;
 	int segments = 0;
 	__be32 *p, tmp;
+	loff_t pos;
 	u32 eof;
 
 	if (nfserr)
@@ -4433,11 +4459,23 @@ nfsd4_encode_read_plus(struct nfsd4_compoundres *resp, __be32 nfserr,
 	maxcount = min_t(unsigned long, maxcount, read->rd_length);
 
 	eof = read->rd_offset >= i_size_read(file_inode(file));
-	if (!eof) {
+	if (eof)
+		goto out;
+
+	pos = vfs_llseek(file, read->rd_offset, SEEK_DATA);
+	if (pos == -ENXIO)
+		pos = i_size_read(file_inode(file));
+
+	if (pos > read->rd_offset) {
+		maxcount = pos - read->rd_offset;
+		nfserr = nfsd4_encode_read_plus_hole(resp, read, maxcount, &eof);
+		segments++;
+	} else {
 		nfserr = nfsd4_encode_read_plus_data(resp, read, maxcount, &eof);
 		segments++;
 	}
 
+out:
 	if (nfserr)
 		xdr_truncate_encode(xdr, starting_len);
 	else {
-- 
2.28.0