xnu-3247.1.106.tar.gz

[apple/xnu.git] / bsd / hfs / hfs_extents.h

diff --git a/bsd/hfs/hfs_extents.h b/bsd/hfs/hfs_extents.h
new file mode 100644 (file)
index 0000000..9dd6073
--- /dev/null
+++ b/bsd/hfs/hfs_extents.h
@@ -0,0 +1,54 @@
+//
+//  hfs_extents.h
+//  hfs
+//
+//  Created by csuter on 7/11/14.
+//  Copyright (c) 2014 Apple. All rights reserved.
+//
+
+#ifndef HFS_EXTENTS_H_
+#define HFS_EXTENTS_H_
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "hfs_format.h"
+
+#if !HFS_EXTENTS_TEST && !HFS_ALLOC_TEST
+#include "hfs_cnode.h"
+#include "hfs.h"
+#include "hfscommon/headers/BTreesInternal.h"
+#endif
+
+typedef struct hfs_ext_iter {
+       struct vnode               *vp;                 // If NULL, this is an xattr extent
+       BTreeIterator                   bt_iter;
+       uint8_t                                 ndx;            // Index in group
+       bool                                    last_in_fork;
+       uint32_t                                file_block;
+       uint32_t                                group_block_count;
+       HFSPlusExtentRecord             group;
+} hfs_ext_iter_t;
+
+errno_t hfs_ext_find(vnode_t vp, off_t offset, hfs_ext_iter_t *iter);
+
+errno_t hfs_ext_replace(hfsmount_t *hfsmp, vnode_t vp,
+                                               uint32_t file_block,
+                                               const HFSPlusExtentDescriptor *repl,
+                                               int count,
+                                               HFSPlusExtentRecord catalog_extents);
+
+bool hfs_ext_iter_is_catalog_extents(hfs_ext_iter_t *iter);
+
+static inline void hfs_ext_copy_rec(const HFSPlusExtentRecord src,
+                                                                       HFSPlusExtentRecord dst)
+{
+       memcpy(dst, src, sizeof(HFSPlusExtentRecord));
+}
+
+static inline uint32_t hfs_ext_end(const HFSPlusExtentDescriptor *ext)
+{
+       return ext->startBlock + ext->blockCount;
+}
+
+#endif // HFS_EXTENTS_H_