core/hfs_extents.h

   1 /*
   2  * Copyright (c) 2014-2015 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
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  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28
  29 #ifndef HFS_EXTENTS_H_
  30 #define HFS_EXTENTS_H_
  31
  32 #include <stdint.h>
  33 #include <stdbool.h>
  34
  35 #include "hfs_format.h"
  36
  37 #if !HFS_EXTENTS_TEST && !HFS_ALLOC_TEST
  38 #include "hfs_cnode.h"
  39 #include "hfs.h"
  40 #include "BTreesInternal.h"
  41 #endif
  42
  43 typedef struct hfs_ext_iter {
  44         struct vnode               *vp;                 // If NULL, this is an xattr extent
  45         BTreeIterator                   bt_iter;
  46         uint8_t                                 ndx;            // Index in group
  47         bool                                    last_in_fork;
  48         uint32_t                                file_block;
  49         uint32_t                                group_block_count;
  50         HFSPlusExtentRecord             group;
  51 } hfs_ext_iter_t;
  52
  53 errno_t hfs_ext_find(vnode_t vp, off_t offset, hfs_ext_iter_t *iter);
  54
  55 errno_t hfs_ext_replace(hfsmount_t *hfsmp, vnode_t vp,
  56                                                 uint32_t file_block,
  57                                                 const HFSPlusExtentDescriptor *repl,
  58                                                 int count,
  59                                                 HFSPlusExtentRecord catalog_extents);
  60
  61 bool hfs_ext_iter_is_catalog_extents(hfs_ext_iter_t *iter);
  62
  63 static inline void hfs_ext_copy_rec(const HFSPlusExtentRecord src,
  64                                                                         HFSPlusExtentRecord dst)
  65 {
  66         memcpy(dst, src, sizeof(HFSPlusExtentRecord));
  67 }
  68
  69 static inline uint32_t hfs_ext_end(const HFSPlusExtentDescriptor *ext)
  70 {
  71         return ext->startBlock + ext->blockCount;
  72 }
  73
  74 #endif // HFS_EXTENTS_H_