1 /*
2 * runlist.h - Defines for runlist handling in NTFS Linux kernel driver.
3 * Part of the Linux-NTFS project.
4 *
5 * Copyright (c) 2001-2005 Anton Altaparmakov
6 * Copyright (c) 2002 Richard Russon
7 *
8 * This program/include file is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as published
10 * by the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program/include file is distributed in the hope that it will be
14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program (in the main directory of the Linux-NTFS
20 * distribution in the file COPYING); if not, write to the Free Software
21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24 #ifndef _LINUX_NTFS_RUNLIST_H
25 #define _LINUX_NTFS_RUNLIST_H
26
27 #include "types.h"
28 #include "layout.h"
29 #include "volume.h"
30
31 /**
32 * runlist_element - in memory vcn to lcn mapping array element
33 * @vcn: starting vcn of the current array element
34 * @lcn: starting lcn of the current array element
35 * @length: length in clusters of the current array element
36 *
37 * The last vcn (in fact the last vcn + 1) is reached when length == 0.
38 *
39 * When lcn == -1 this means that the count vcns starting at vcn are not
40 * physically allocated (i.e. this is a hole / data is sparse).
41 */
42 typedef struct { /* In memory vcn to lcn mapping structure element. */
43 VCN vcn; /* vcn = Starting virtual cluster number. */
44 LCN lcn; /* lcn = Starting logical cluster number. */
45 s64 length; /* Run length in clusters. */
46 } runlist_element;
47
48 /**
49 * runlist - in memory vcn to lcn mapping array including a read/write lock
50 * @rl: pointer to an array of runlist elements
51 * @lock: read/write spinlock for serializing access to @rl
52 *
53 */
54 typedef struct {
55 runlist_element *rl;
56 struct rw_semaphore lock;
57 } runlist;
58
59 static inline void ntfs_init_runlist(runlist *rl)
60 {
61 rl->rl = NULL;
62 init_rwsem(&rl->lock);
63 }
64
65 typedef enum {
66 LCN_HOLE = -1, /* Keep this as highest value or die! */
67 LCN_RL_NOT_MAPPED = -2,
68 LCN_ENOENT = -3,
69 LCN_ENOMEM = -4,
70 LCN_EIO = -5,
71 } LCN_SPECIAL_VALUES;
72
73 extern runlist_element *ntfs_runlists_merge(runlist_element *drl,
74 runlist_element *srl);
75
76 extern runlist_element *ntfs_mapping_pairs_decompress(const ntfs_volume *vol,
77 const ATTR_RECORD *attr, runlist_element *old_rl);
78
79 extern LCN ntfs_rl_vcn_to_lcn(const runlist_element *rl, const VCN vcn);
80
81 #ifdef NTFS_RW
82
83 extern runlist_element *ntfs_rl_find_vcn_nolock(runlist_element *rl,
84 const VCN vcn);
85
86 extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume *vol,
87 const runlist_element *rl, const VCN first_vcn,
88 const VCN last_vcn);
89
90 extern int ntfs_mapping_pairs_build(const ntfs_volume *vol, s8 *dst,
91 const int dst_len, const runlist_element *rl,
92 const VCN first_vcn, const VCN last_vcn, VCN *const stop_vcn);
93
94 extern int ntfs_rl_truncate_nolock(const ntfs_volume *vol,
95 runlist *const runlist, const s64 new_length);
96
97 int ntfs_rl_punch_nolock(const ntfs_volume *vol, runlist *const runlist,
98 const VCN start, const s64 length);
99
100 #endif /* NTFS_RW */
101
102 #endif /* _LINUX_NTFS_RUNLIST_H */
103
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