struct pnfs_export_operations defines the VFS level API for pNFS,
not including callbacks. A pnfs-exportable filesystem sets
a pointer to its pnfs export vector in its struct super_block.s_pnfs_op.
The file system provides the per-superblock layout_type method that
determines if it supports pnfs for the filesystem identified by
the superblock, and if so, with which layout type (only one per-sb is
supported).
Device ops:
get_device_iter is used to fill-in the device list for GETDEVICELIST
and get_device_info is used to encode the device info for GETDEVICEINFO.
Layout ops:
layout_get, layout_commit, and layout_return implement the file system- and
layout type- specific parts of their respective protocol operations: LAYOUTGET,
LAYOUTCOMMIT, and LAYOUTRETURN.
Note: define pnfs export operations in a stub form in this patch.
Actual operations are defined along with their usage.
Note: the following methods are mandatory to be implemented:
layout_type, get_device_info, and layout_get.
[pnfsd: provide default no-op operations]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
[pnfsd: compile fixes for pnfsd branch]
Signed-off-by: Fred Isaman <iisaman@xxxxxxxxxxxxxx>
[gfs2: set pnfs_dlm_export_ops only for CONFIG_PNFSD]
[pnfsd: handle s_pnfs_op==NULL]
Signed-off-by: Benny Halevy <bhalevy@xxxxxxxxxxx>
---
fs/nfsd/export.c | 1 +
include/linux/fs.h | 2 ++
include/linux/nfsd/nfsd4_pnfs.h | 14 ++++++++++++++
3 files changed, 17 insertions(+), 0 deletions(-)
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index cd377a7..f82ed90 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -18,6 +18,7 @@
#include <linux/module.h>
#include <linux/exportfs.h>
+#include <linux/nfsd/nfsd4_pnfs.h>
#include <linux/nfsd/syscall.h>
#include <net/ipv6.h>
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2620a8c..9a9beb8 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -382,6 +382,7 @@ struct inodes_stat_t {
#include <asm/byteorder.h>
struct export_operations;
+struct pnfs_export_operations;
struct hd_geometry;
struct iovec;
struct nameidata;
@@ -1325,6 +1326,7 @@ struct super_block {
const struct dquot_operations *dq_op;
const struct quotactl_ops *s_qcop;
const struct export_operations *s_export_op;
+ const struct pnfs_export_operations *s_pnfs_op;
unsigned long s_flags;
unsigned long s_magic;
struct dentry *s_root;
diff --git a/include/linux/nfsd/nfsd4_pnfs.h b/include/linux/nfsd/nfsd4_pnfs.h
index 9e7d95e..ff6613e 100644
--- a/include/linux/nfsd/nfsd4_pnfs.h
+++ b/include/linux/nfsd/nfsd4_pnfs.h
@@ -34,4 +34,18 @@
#ifndef _LINUX_NFSD_NFSD4_PNFS_H
#define _LINUX_NFSD_NFSD4_PNFS_H
+/*
+ * pNFS export operations vector.
+ *
+ * The filesystem must implement the following methods:
+ * layout_type
+ * get_device_info
+ * layout_get
+ *
+ * All other methods are optional and can be set to NULL if not implemented.
+ */
+struct pnfs_export_operations {
+ /* stub */
+};
+
#endif /* _LINUX_NFSD_NFSD4_PNFS_H */
--
1.6.5.1
--
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