bsd/hfs/hfs_extents.h

   1 //
   2 //  hfs_extents.h
   3 //  hfs
   4 //
   5 //  Created by csuter on 7/11/14.
   6 //  Copyright (c) 2014 Apple. All rights reserved.
   7 //
   8
   9 #ifndef HFS_EXTENTS_H_
  10 #define HFS_EXTENTS_H_
  11
  12 #include <stdint.h>
  13 #include <stdbool.h>
  14
  15 #include "hfs_format.h"
  16
  17 #if !HFS_EXTENTS_TEST && !HFS_ALLOC_TEST
  18 #include "hfs_cnode.h"
  19 #include "hfs.h"
  20 #include "hfscommon/headers/BTreesInternal.h"
  21 #endif
  22
  23 typedef struct hfs_ext_iter {
  24         struct vnode               *vp;                 // If NULL, this is an xattr extent
  25         BTreeIterator                   bt_iter;
  26         uint8_t                                 ndx;            // Index in group
  27         bool                                    last_in_fork;
  28         uint32_t                                file_block;
  29         uint32_t                                group_block_count;
  30         HFSPlusExtentRecord             group;
  31 } hfs_ext_iter_t;
  32
  33 errno_t hfs_ext_find(vnode_t vp, off_t offset, hfs_ext_iter_t *iter);
  34
  35 errno_t hfs_ext_replace(hfsmount_t *hfsmp, vnode_t vp,
  36                                                 uint32_t file_block,
  37                                                 const HFSPlusExtentDescriptor *repl,
  38                                                 int count,
  39                                                 HFSPlusExtentRecord catalog_extents);
  40
  41 bool hfs_ext_iter_is_catalog_extents(hfs_ext_iter_t *iter);
  42
  43 static inline void hfs_ext_copy_rec(const HFSPlusExtentRecord src,
  44                                                                         HFSPlusExtentRecord dst)
  45 {
  46         memcpy(dst, src, sizeof(HFSPlusExtentRecord));
  47 }
  48
  49 static inline uint32_t hfs_ext_end(const HFSPlusExtentDescriptor *ext)
  50 {
  51         return ext->startBlock + ext->blockCount;
  52 }
  53
  54 #endif // HFS_EXTENTS_H_