2 * runlist.h - Defines for runlist handling in NTFS Linux kernel driver.
3 * Part of the Linux-NTFS project.
5 * Copyright (c) 2001-2005 Anton Altaparmakov
6 * Copyright (c) 2002 Richard Russon
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.
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.
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
24 #ifndef _LINUX_NTFS_RUNLIST_H
25 #define _LINUX_NTFS_RUNLIST_H
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
37 * The last vcn (in fact the last vcn + 1) is reached when length == 0.
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).
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. */
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
56 struct rw_semaphore lock
;
59 static inline void ntfs_init_runlist(runlist
*rl
)
62 init_rwsem(&rl
->lock
);
66 LCN_HOLE
= -1, /* Keep this as highest value or die! */
67 LCN_RL_NOT_MAPPED
= -2,
73 extern runlist_element
*ntfs_runlists_merge(runlist_element
*drl
,
74 runlist_element
*srl
);
76 extern runlist_element
*ntfs_mapping_pairs_decompress(const ntfs_volume
*vol
,
77 const ATTR_RECORD
*attr
, runlist_element
*old_rl
);
79 extern LCN
ntfs_rl_vcn_to_lcn(const runlist_element
*rl
, const VCN vcn
);
83 extern runlist_element
*ntfs_rl_find_vcn_nolock(runlist_element
*rl
,
86 extern int ntfs_get_size_for_mapping_pairs(const ntfs_volume
*vol
,
87 const runlist_element
*rl
, const VCN first_vcn
,
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
);
94 extern int ntfs_rl_truncate_nolock(const ntfs_volume
*vol
,
95 runlist
*const runlist
, const s64 new_length
);
99 #endif /* _LINUX_NTFS_RUNLIST_H */
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