X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=fs%2Fisofs%2Fexport.c;h=ed752cb3847426f108803af94566ba79d80786ed;hb=a8bef8ff6ea15fa4c67433cab0f5f3484574ef7c;hp=4af856a7fda7fd3f0fc97b86cccefa595c3d58db;hpb=94f2f715771d0aa5554451d1e2a920f11b8be3fe;p=safe%2Fjmp%2Flinux-2.6

diff --git a/fs/isofs/export.c b/fs/isofs/export.c
index 4af856a..ed752cb 100644
--- a/fs/isofs/export.c
+++ b/fs/isofs/export.c
@@ -9,7 +9,7 @@
  *
  * The following files are helpful:
  *
- *     Documentation/filesystems/Exporting
+ *     Documentation/filesystems/nfs/Exporting
  *     fs/exportfs/expfs.c.
  */
 
@@ -22,34 +22,17 @@ isofs_export_iget(struct super_block *sb,
 		  __u32 generation)
 {
 	struct inode *inode;
-	struct dentry *result;
+
 	if (block == 0)
 		return ERR_PTR(-ESTALE);
 	inode = isofs_iget(sb, block, offset);
-	if (inode == NULL)
-		return ERR_PTR(-ENOMEM);
-	if (is_bad_inode(inode)
-	    || (generation && inode->i_generation != generation))
-	{
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
+	if (generation && inode->i_generation != generation) {
 		iput(inode);
 		return ERR_PTR(-ESTALE);
 	}
-	result = d_alloc_anon(inode);
-	if (!result) {
-		iput(inode);
-		return ERR_PTR(-ENOMEM);
-	}
-	return result;
-}
-
-static struct dentry *
-isofs_export_get_dentry(struct super_block *sb, void *vobjp)
-{
-	__u32 *objp = vobjp;
-	unsigned long block = objp[0];
-	unsigned long offset = objp[1];
-	__u32 generation = objp[2];
-	return isofs_export_iget(sb, block, offset, generation);
+	return d_obtain_alias(inode);
 }
 
 /* This function is surprisingly simple.  The trick is understanding
@@ -63,7 +46,6 @@ static struct dentry *isofs_export_get_parent(struct dentry *child)
 	unsigned long parent_offset = 0;
 	struct inode *child_inode = child->d_inode;
 	struct iso_inode_info *e_child_inode = ISOFS_I(child_inode);
-	struct inode *parent_inode = NULL;
 	struct iso_directory_record *de = NULL;
 	struct buffer_head * bh = NULL;
 	struct dentry *rv = NULL;
@@ -116,26 +98,11 @@ static struct dentry *isofs_export_get_parent(struct dentry *child)
 	/* Normalize */
 	isofs_normalize_block_and_offset(de, &parent_block, &parent_offset);
 
-	/* Get the inode. */
-	parent_inode = isofs_iget(child_inode->i_sb,
-				  parent_block,
-				  parent_offset);
-	if (parent_inode == NULL) {
-		rv = ERR_PTR(-EACCES);
-		goto out;
-	}
-
-	/* Allocate the dentry. */
-	rv = d_alloc_anon(parent_inode);
-	if (rv == NULL) {
-		rv = ERR_PTR(-ENOMEM);
-		goto out;
-	}
-
+	rv = d_obtain_alias(isofs_iget(child_inode->i_sb, parent_block,
+				     parent_offset));
  out:
-	if (bh) {
+	if (bh)
 		brelse(bh);
-	}
 	return rv;
 }
 
@@ -182,43 +149,44 @@ isofs_export_encode_fh(struct dentry *dentry,
 	return type;
 }
 
+struct isofs_fid {
+	u32 block;
+	u16 offset;
+	u16 parent_offset;
+	u32 generation;
+	u32 parent_block;
+	u32 parent_generation;
+};
 
-static struct dentry *
-isofs_export_decode_fh(struct super_block *sb,
-		       __u32 *fh32,
-		       int fh_len,
-		       int fileid_type,
-		       int (*acceptable)(void *context, struct dentry *de),
-		       void *context)
+static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
+	struct fid *fid, int fh_len, int fh_type)
 {
-	__u16 *fh16 = (__u16*)fh32;
-	__u32 child[3];   /* The child is what triggered all this. */
-	__u32 parent[3];  /* The parent is just along for the ride. */
+	struct isofs_fid *ifid = (struct isofs_fid *)fid;
 
-	if (fh_len < 3 || fileid_type > 2)
+	if (fh_len < 3 || fh_type > 2)
 		return NULL;
 
-	child[0] = fh32[0];
-	child[1] = fh16[2];  /* fh16 [sic] */
-	child[2] = fh32[2];
-
-	parent[0] = 0;
-	parent[1] = 0;
-	parent[2] = 0;
-	if (fileid_type == 2) {
-		if (fh_len > 2) parent[0] = fh32[3];
-		parent[1] = fh16[3];  /* fh16 [sic] */
-		if (fh_len > 4) parent[2] = fh32[4];
-	}
-
-	return sb->s_export_op->find_exported_dentry(sb, child, parent,
-						     acceptable, context);
+	return isofs_export_iget(sb, ifid->block, ifid->offset,
+			ifid->generation);
 }
 
+static struct dentry *isofs_fh_to_parent(struct super_block *sb,
+		struct fid *fid, int fh_len, int fh_type)
+{
+	struct isofs_fid *ifid = (struct isofs_fid *)fid;
+
+	if (fh_type != 2)
+		return NULL;
+
+	return isofs_export_iget(sb,
+			fh_len > 2 ? ifid->parent_block : 0,
+			ifid->parent_offset,
+			fh_len > 4 ? ifid->parent_generation : 0);
+}
 
-struct export_operations isofs_export_ops = {
-	.decode_fh	= isofs_export_decode_fh,
+const struct export_operations isofs_export_ops = {
 	.encode_fh	= isofs_export_encode_fh,
-	.get_dentry	= isofs_export_get_dentry,
+	.fh_to_dentry	= isofs_fh_to_dentry,
+	.fh_to_parent	= isofs_fh_to_parent,
 	.get_parent     = isofs_export_get_parent,
 };