exofs: export_operations

[net-next-2.6.git] / fs / exofs / super.c

diff --git a/fs/exofs/super.c b/fs/exofs/super.c
index b736b117a2a405a08e20444042bb1accfd024aab..9f1985e857e254c5315928e7daf84461baa1a3ca 100644 (file)
--- 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 @@ static void destroy_inodecache(void)
  * 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 @@ static int exofs_fill_super(struct super_block *sb, void *data, int silent)
 
        /* 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");
@@ -484,6 +487,56 @@ static const struct super_operations exofs_sops = {
        .statfs         = exofs_statfs,
 };
 
+/******************************************************************************
+ * 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
  *****************************************************************************/