[PATCH/RFC 2/7] Added support for FH_EXPIRE_TYPE attribute.

[Matthew Treinish <treinish@linux.vnet.ibm.com>]

FH_EXPIRE_TYPE is used by the client to determine
what type of filehandle the server is providing for a
particular filesystem.

I added the bitmask to fsinfo since the bitmask is
set per filesystem.

Signed-off-by: Matthew Treinish <treinish@linux.vnet.ibm.com>
---
 fs/nfs/client.c           |    2 ++
 fs/nfs/nfs4proc.c         |    3 ++-
 fs/nfs/nfs4xdr.c          |   27 +++++++++++++++++++++++++++
 include/linux/nfs_fs_sb.h |    1 +
 include/linux/nfs_xdr.h   |    1 +
 5 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 873bf00..44dedfe 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -957,6 +957,8 @@ static void nfs_server_set_fsinfo(struct nfs_server *server,
 
 	server->time_delta = fsinfo->time_delta;
 
+	server->fhexpiretype = fsinfo->fhexpiretype;
+
 	/* We're airborne Set socket buffersize */
 	rpc_setbufsize(server->client, server->wsize + 100, server->rsize + 100);
 }
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index b60fddf..86c273e 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -140,7 +140,8 @@ const u32 nfs4_pathconf_bitmap[2] = {
 const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
 			| FATTR4_WORD0_MAXREAD
 			| FATTR4_WORD0_MAXWRITE
-			| FATTR4_WORD0_LEASE_TIME,
+			| FATTR4_WORD0_LEASE_TIME
+			| FATTR4_WORD0_FH_EXPIRE_TYPE,
 			FATTR4_WORD1_TIME_DELTA
 			| FATTR4_WORD1_FS_LAYOUT_TYPES,
 			FATTR4_WORD2_LAYOUT_BLKSIZE
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index e6161b2..4d775e2 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -4508,6 +4508,30 @@ static int decode_attr_layout_blksize(struct xdr_stream *xdr, uint32_t *bitmap,
 	return 0;
 }
 
+/*
+ * The VFH expire type bitmask
+ */
+
+static int decode_attr_fh_expire_type(struct xdr_stream *xdr, uint32_t *bitmap,
+					uint32_t *res)
+{
+	__be32 *p;
+
+	dprintk("%s: bitmap %x\n", __func__, bitmap[0]);
+	*res = 0;
+	if (bitmap[0] & FATTR4_WORD0_FH_EXPIRE_TYPE) {
+		p = xdr_inline_decode(xdr, 4);
+		if (unlikely(!p)) {
+			print_overflow_msg(__func__, xdr);
+			return -EIO;
+		}
+		*res = be32_to_cpup(p);
+		bitmap[0] &= ~FATTR4_WORD0_FH_EXPIRE_TYPE;
+	}
+	return 0;
+
+}
+
 static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
 {
 	__be32 *savep;
@@ -4523,6 +4547,9 @@ static int decode_fsinfo(struct xdr_stream *xdr, struct nfs_fsinfo *fsinfo)
 
 	fsinfo->rtmult = fsinfo->wtmult = 512;	/* ??? */
 
+	if ((status = decode_attr_fh_expire_type(xdr, bitmap, &fsinfo->fhexpiretype)) != 0)
+		goto xdr_error;
+
 	if ((status = decode_attr_lease_time(xdr, bitmap, &fsinfo->lease_time)) != 0)
 		goto xdr_error;
 	if ((status = decode_attr_maxfilesize(xdr, bitmap, &fsinfo->maxfilesize)) != 0)
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index b5479df..706c92b 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -112,6 +112,7 @@ struct nfs_server {
 	unsigned int		dtsize;		/* readdir size */
 	unsigned short		port;		/* "port=" setting */
 	unsigned int		bsize;		/* server block size */
+	unsigned int		fhexpiretype;   /* VFH attributes */
 	unsigned int		acregmin;	/* attr cache timeouts */
 	unsigned int		acregmax;
 	unsigned int		acdirmin;
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index c74595b..72ba66b 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -123,6 +123,7 @@ struct nfs_fsinfo {
 	__u32			lease_time; /* in seconds */
 	__u32			layouttype; /* supported pnfs layout driver */
 	__u32			blksize; /* preferred pnfs io block size */
+	__u32			fhexpiretype; /* VFH attributes */
 };
 
 struct nfs_fsstat {
-- 
1.7.4.4