exofs: export_operations
implement export_operations and set in superblock.
It is now posible to export exofs via nfs
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index b736b11..9f1985e 100644
--- a/fs/exofs/super.c
+++ b/fs/exofs/super.c
@@ -37,6 +37,7 @@
#include <linux/parser.h>
#include <linux/vfs.h>
#include <linux/random.h>
+#include <linux/exportfs.h>
#include "exofs.h"
@@ -194,6 +195,7 @@
* SUPERBLOCK FUNCTIONS
*****************************************************************************/
static const struct super_operations exofs_sops;
+static const struct export_operations exofs_export_ops;
/*
* Write the superblock to the OSD
@@ -358,6 +360,7 @@
/* set up operation vectors */
sb->s_op = &exofs_sops;
+ sb->s_export_op = &exofs_export_ops;
root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
if (IS_ERR(root)) {
EXOFS_ERR("ERROR: exofs_iget failed\n");
@@ -485,6 +488,56 @@
};
/******************************************************************************
+ * EXPORT OPERATIONS
+ *****************************************************************************/
+
+struct dentry *exofs_get_parent(struct dentry *child)
+{
+ unsigned long ino = exofs_parent_ino(child);
+
+ if (!ino)
+ return NULL;
+
+ return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
+}
+
+static struct inode *exofs_nfs_get_inode(struct super_block *sb,
+ u64 ino, u32 generation)
+{
+ struct inode *inode;
+
+ inode = exofs_iget(sb, ino);
+ if (IS_ERR(inode))
+ return ERR_CAST(inode);
+ if (generation && inode->i_generation != generation) {
+ /* we didn't find the right inode.. */
+ iput(inode);
+ return ERR_PTR(-ESTALE);
+ }
+ return inode;
+}
+
+static struct dentry *exofs_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,
+ exofs_nfs_get_inode);
+}
+
+static struct dentry *exofs_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,
+ exofs_nfs_get_inode);
+}
+
+static const struct export_operations exofs_export_ops = {
+ .fh_to_dentry = exofs_fh_to_dentry,
+ .fh_to_parent = exofs_fh_to_parent,
+ .get_parent = exofs_get_parent,
+};
+
+/******************************************************************************
* INSMOD/RMMOD
*****************************************************************************/