Implement mandatory export_operations, so it is possible to export befs via
nfs.
Signed-off-by: Luis de Bethencourt <lui...@osg.samsung.com>
---
Hi,
NFS exporting is a very useful feature. I implement here fh_to_dentry because
it is the mandatory member of struct export_operations, and fh_to_parent since
it is easy once you have the previous one and recommended [0].
I can't trigger a call for get_parent, so not adding that one yet.
With this befs via NFS becomes available.
Thanks,
Luis
[0] Documentation/filesystems/nfs/Exporting
fs/befs/linuxvfs.c | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 8e4e18e..6ff7d01 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -18,6 +18,7 @@
#include <linux/parser.h>
#include <linux/namei.h>
#include <linux/sched.h>
+#include <linux/exportfs.h>
#include "befs.h"
#include "btree.h"
@@ -52,6 +53,10 @@ static void befs_put_super(struct super_block *);
static int befs_remount(struct super_block *, int *, char *);
static int befs_statfs(struct dentry *, struct kstatfs *);
static int parse_options(char *, struct befs_mount_options *);
+static struct dentry *befs_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type);
+static struct dentry *befs_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type);
static const struct super_operations befs_sops = {
.alloc_inode = befs_alloc_inode, /* allocate a new inode */
@@ -84,6 +89,11 @@ static const struct address_space_operations
befs_symlink_aops = {
.readpage = befs_symlink_readpage,
};
+static const struct export_operations befs_export_operations = {
+ .fh_to_dentry = befs_fh_to_dentry,
+ .fh_to_parent = befs_fh_to_parent,
+};
+
/*
* Called by generic_file_read() to read a page of data
*
@@ -629,6 +639,33 @@ befs_nls2utf(struct super_block *sb, const char *in,
return -EILSEQ;
}
+static struct inode *befs_nfs_get_inode(struct super_block *sb, uint64_t ino,
+ uint32_t generation)
+{
+ /* No need to handle i_generation */
+ return befs_iget(sb, ino);
+}
+
+/*
+ * Map a NFS file handle to a corresponding dentry
+ */
+static struct dentry *befs_fh_to_dentry(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+ befs_nfs_get_inode);
+}
+
+/*
+ * Find the parent for a file specified by NFS handle
+ */
+static struct dentry *befs_fh_to_parent(struct super_block *sb,
+ struct fid *fid, int fh_len, int fh_type)
+{
+ return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+ befs_nfs_get_inode);
+}
+
enum {
Opt_uid, Opt_gid, Opt_charset, Opt_debug, Opt_err,
};
@@ -829,6 +866,7 @@ befs_fill_super(struct super_block *sb, void *data, int
silent)
/* Set real blocksize of fs */
sb_set_blocksize(sb, (ulong) befs_sb->block_size);
sb->s_op = &befs_sops;
+ sb->s_export_op = &befs_export_operations;
root = befs_iget(sb, iaddr2blockno(sb, &(befs_sb->root_dir)));
if (IS_ERR(root)) {
ret = PTR_ERR(root);
--
2.10.2
