ntfs: new export ops

Trivial switch over to the new generic helpers.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Neil Brown <neilb@suse.de>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Anton Altaparmakov <aia21@cantab.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ntfs/namei.c

@@ -450,58 +450,40 @@ static struct dentry *ntfs_get_parent(struct dentry *child_dent)
 	return parent_dent;
 }
 
-/**
- * ntfs_get_dentry - find a dentry for the inode from a file handle sub-fragment
- * @sb:		super block identifying the mounted ntfs volume
- * @fh:		the file handle sub-fragment
- *
- * Find a dentry for the inode given a file handle sub-fragment.  This function
- * is called from fs/exportfs/expfs.c::find_exported_dentry() which in turn is
- * called from the default ->decode_fh() which is export_decode_fh() in the
- * same file.  The code is closely based on the default ->get_dentry() helper
- * fs/exportfs/expfs.c::get_object().
- *
- * The @fh contains two 32-bit unsigned values, the first one is the inode
- * number and the second one is the inode generation.
- *
- * Return the dentry on success or the error code on error (IS_ERR() is true).
- */
-static struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
+static struct inode *ntfs_nfs_get_inode(struct super_block *sb,
+		u64 ino, u32 generation)
 {
-	struct inode *vi;
-	struct dentry *dent;
-	unsigned long ino = ((u32 *)fh)[0];
-	u32 gen = ((u32 *)fh)[1];
+	struct inode *inode;
 
-	ntfs_debug("Entering for inode 0x%lx, generation 0x%x.", ino, gen);
-	vi = ntfs_iget(sb, ino);
-	if (IS_ERR(vi)) {
-		ntfs_error(sb, "Failed to get inode 0x%lx.", ino);
-		return (struct dentry *)vi;
-	}
-	if (unlikely(is_bad_inode(vi) || vi->i_generation != gen)) {
-		/* We didn't find the right inode. */
-		ntfs_error(sb, "Inode 0x%lx, bad count: %d %d or version 0x%x "
-				"0x%x.", vi->i_ino, vi->i_nlink,
-				atomic_read(&vi->i_count), vi->i_generation,
-				gen);
-		iput(vi);
-		return ERR_PTR(-ESTALE);
+	inode = ntfs_iget(sb, ino);
+	if (!IS_ERR(inode)) {
+		if (is_bad_inode(inode) || inode->i_generation != generation) {
+			iput(inode);
+			inode = ERR_PTR(-ESTALE);
 		}
-	/* Now find a dentry.  If possible, get a well-connected one. */
-	dent = d_alloc_anon(vi);
-	if (unlikely(!dent)) {
-		iput(vi);
-		return ERR_PTR(-ENOMEM);
 	}
-	ntfs_debug("Done for inode 0x%lx, generation 0x%x.", ino, gen);
-	return dent;
+
+	return inode;
+}
+
+static struct dentry *ntfs_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,
+				    ntfs_nfs_get_inode);
+}
+
+static struct dentry *ntfs_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,
+				    ntfs_nfs_get_inode);
 }
 
 /**
  * Export operations allowing NFS exporting of mounted NTFS partitions.
  *
- * We use the default ->decode_fh() and ->encode_fh() for now.  Note that they
+ * We use the default ->encode_fh() for now.  Note that they
  * use 32 bits to store the inode number which is an unsigned long so on 64-bit
  * architectures is usually 64 bits so it would all fail horribly on huge
  * volumes.  I guess we need to define our own encode and decode fh functions
@@ -520,7 +502,6 @@ static struct dentry *ntfs_get_dentry(struct super_block *sb, void *fh)
 struct export_operations ntfs_export_ops = {
 	.get_parent	= ntfs_get_parent,	/* Find the parent of a given
 						   directory. */
-	.get_dentry	= ntfs_get_dentry,	/* Find a dentry for the inode
-						   given a file handle
-						   sub-fragment. */
+	.fh_to_dentry	= ntfs_fh_to_dentry,
+	.fh_to_parent	= ntfs_fh_to_parent,
 };