From: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
A very first step of re-exporting nfs via knfsd. For now, it's just
copying the underlying server's filehandle. Later patches will add
the piece that embeds it in a new FH instead.
[jlayton: add export ops flags field]
Signed-off-by: Peng Tao <tao.peng@xxxxxxxxxxxxxxx>
Signed-off-by: Jeff Layton <jeff.layton@xxxxxxxxxxxxxxx>
---
fs/nfs/Makefile | 1 +
fs/nfs/export.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
create mode 100644 fs/nfs/export.c
diff --git a/fs/nfs/Makefile b/fs/nfs/Makefile
index 8664417955a2..f1443f14be79 100644
--- a/fs/nfs/Makefile
+++ b/fs/nfs/Makefile
@@ -11,6 +11,7 @@ nfs-y := client.o dir.o file.o getroot.o inode.o super.o \
nfs-$(CONFIG_ROOT_NFS) += nfsroot.o
nfs-$(CONFIG_SYSCTL) += sysctl.o
nfs-$(CONFIG_NFS_FSCACHE) += fscache.o fscache-index.o
+nfs-$(CONFIG_NFS_REEXPORT) += export.o
obj-$(CONFIG_NFS_V2) += nfsv2.o
nfsv2-y := nfs2super.o proc.o nfs2xdr.o
diff --git a/fs/nfs/export.c b/fs/nfs/export.c
new file mode 100644
index 000000000000..d446f77b26b3
--- /dev/null
+++ b/fs/nfs/export.c
@@ -0,0 +1,46 @@
+/*
+ * Module for pnfs flexfile layout driver.
+ *
+ * Copyright (c) 2015, Primary Data, Inc. All rights reserved.
+ *
+ * Tao Peng <bergwolf@xxxxxxxxxxxxxxx>
+ */
+
+#include <linux/exportfs.h>
+#include <linux/nfs.h>
+#include <linux/nfs_fs.h>
+
+#include "nfstrace.h"
+
+#define NFSDBG_FACILITY NFSDBG_VFS
+
+/*
+ * Let's break subtree checking for now... otherwise we'll have to embed parent fh
+ * but there might not be enough space.
+ */
+static int
+nfs_encode_fh(struct inode *inode, __u32 *p, int *max_len, struct inode *parent)
+{
+ struct nfs_fh *server_fh = NFS_FH(inode);
+ struct nfs_fh *clnt_fh = (struct nfs_fh *)p;
+ int disconnected_fh_len = server_fh->size / 4 + 1;
+
+ dprintk("%s: max fh len %d inode %p parent %p",
+ __func__, *max_len, inode, parent);
+
+ if (*max_len < disconnected_fh_len) {
+ *max_len = disconnected_fh_len;
+ return FILEID_INVALID;
+ }
+
+ nfs_copy_fh(clnt_fh, server_fh);
+ *max_len = disconnected_fh_len;
+
+ dprintk("%s: result fh size %d\n", __func__, *max_len);
+ return *max_len;
+}
+
+const struct export_operations nfs_export_ops = {
+ .encode_fh = nfs_encode_fh,
+ .flags = EXPORT_OP_NOWCC|EXPORT_OP_NOSUBTREECHK|EXPORT_OP_CLOSE_BEFORE_UNLINK,
+};
--
2.4.3
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