tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * lcnalloc.h - Exports for NTFS kernel cluster (de)allocation. Part of the
3 * Linux-NTFS project.
4 *
5 * Copyright (c) 2004 Anton Altaparmakov
6 *
7 * This program/include file is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program/include file is distributed in the hope that it will be
13 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program (in the main directory of the Linux-NTFS
19 * distribution in the file COPYING); if not, write to the Free Software
20 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#ifndef _LINUX_NTFS_LCNALLOC_H
24#define _LINUX_NTFS_LCNALLOC_H
25
26#ifdef NTFS_RW
27
28#include <linux/fs.h>
29
30#include "types.h"
31#include "runlist.h"
32#include "volume.h"
33
34typedef enum {
35 FIRST_ZONE = 0, /* For sanity checking. */
36 MFT_ZONE = 0, /* Allocate from $MFT zone. */
37 DATA_ZONE = 1, /* Allocate from $DATA zone. */
38 LAST_ZONE = 1, /* For sanity checking. */
39} NTFS_CLUSTER_ALLOCATION_ZONES;
40
41extern runlist_element *ntfs_cluster_alloc(ntfs_volume *vol,
42 const VCN start_vcn, const s64 count, const LCN start_lcn,
43 const NTFS_CLUSTER_ALLOCATION_ZONES zone);
44
45extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
46 s64 count, const BOOL write_locked, const BOOL is_rollback);
47
48/**
49 * ntfs_cluster_free - free clusters on an ntfs volume
50 * @vi: vfs inode whose runlist describes the clusters to free
51 * @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
52 * @count: number of clusters to free or -1 for all clusters
53 * @write_locked: true if the runlist is locked for writing
54 *
55 * Free @count clusters starting at the cluster @start_vcn in the runlist
56 * described by the vfs inode @vi.
57 *
58 * If @count is -1, all clusters from @start_vcn to the end of the runlist are
59 * deallocated. Thus, to completely free all clusters in a runlist, use
60 * @start_vcn = 0 and @count = -1.
61 *
62 * Note, ntfs_cluster_free() does not modify the runlist at all, so the caller
63 * has to deal with it later.
64 *
65 * Return the number of deallocated clusters (not counting sparse ones) on
66 * success and -errno on error.
67 *
68 * Locking: - The runlist described by @vi must be locked on entry and is
69 * locked on return. Note if the runlist is locked for reading the
70 * lock may be dropped and reacquired. Note the runlist may be
71 * modified when needed runlist fragments need to be mapped.
72 * - The volume lcn bitmap must be unlocked on entry and is unlocked
73 * on return.
74 * - This function takes the volume lcn bitmap lock for writing and
75 * modifies the bitmap contents.
76 */
77static inline s64 ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
78 s64 count, const BOOL write_locked)
79{
80 return __ntfs_cluster_free(vi, start_vcn, count, write_locked, FALSE);
81}
82
83extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
84 const runlist_element *rl);
85
86/**
87 * ntfs_cluster_free_from_rl - free clusters from runlist
88 * @vol: mounted ntfs volume on which to free the clusters
89 * @rl: runlist describing the clusters to free
90 *
91 * Free all the clusters described by the runlist @rl on the volume @vol. In
92 * the case of an error being returned, at least some of the clusters were not
93 * freed.
94 *
95 * Return 0 on success and -errno on error.
96 *
97 * Locking: - This function takes the volume lcn bitmap lock for writing and
98 * modifies the bitmap contents.
99 * - The caller must have locked the runlist @rl for reading or
100 * writing.
101 */
102static inline int ntfs_cluster_free_from_rl(ntfs_volume *vol,
103 const runlist_element *rl)
104{
105 int ret;
106
107 down_write(&vol->lcnbmp_lock);
108 ret = ntfs_cluster_free_from_rl_nolock(vol, rl);
109 up_write(&vol->lcnbmp_lock);
110 return ret;
111}
112
113#endif /* NTFS_RW */
114
115#endif /* defined _LINUX_NTFS_LCNALLOC_H */