1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
112 lines
3.8 KiB
C
112 lines
3.8 KiB
C
/*
|
|
* lcnalloc.h - Exports for NTFS kernel cluster (de)allocation. Part of the
|
|
* Linux-NTFS project.
|
|
*
|
|
* Copyright (c) 2004 Anton Altaparmakov
|
|
*
|
|
* This program/include file is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as published
|
|
* by the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program/include file is distributed in the hope that it will be
|
|
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program (in the main directory of the Linux-NTFS
|
|
* distribution in the file COPYING); if not, write to the Free Software
|
|
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*/
|
|
|
|
#ifndef _LINUX_NTFS_LCNALLOC_H
|
|
#define _LINUX_NTFS_LCNALLOC_H
|
|
|
|
#ifdef NTFS_RW
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include "types.h"
|
|
#include "runlist.h"
|
|
#include "volume.h"
|
|
|
|
typedef enum {
|
|
FIRST_ZONE = 0, /* For sanity checking. */
|
|
MFT_ZONE = 0, /* Allocate from $MFT zone. */
|
|
DATA_ZONE = 1, /* Allocate from $DATA zone. */
|
|
LAST_ZONE = 1, /* For sanity checking. */
|
|
} NTFS_CLUSTER_ALLOCATION_ZONES;
|
|
|
|
extern runlist_element *ntfs_cluster_alloc(ntfs_volume *vol,
|
|
const VCN start_vcn, const s64 count, const LCN start_lcn,
|
|
const NTFS_CLUSTER_ALLOCATION_ZONES zone);
|
|
|
|
extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
|
|
s64 count, const BOOL is_rollback);
|
|
|
|
/**
|
|
* ntfs_cluster_free - free clusters on an ntfs volume
|
|
* @vi: vfs inode whose runlist describes the clusters to free
|
|
* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
|
|
* @count: number of clusters to free or -1 for all clusters
|
|
*
|
|
* Free @count clusters starting at the cluster @start_vcn in the runlist
|
|
* described by the vfs inode @vi.
|
|
*
|
|
* If @count is -1, all clusters from @start_vcn to the end of the runlist are
|
|
* deallocated. Thus, to completely free all clusters in a runlist, use
|
|
* @start_vcn = 0 and @count = -1.
|
|
*
|
|
* Note, ntfs_cluster_free() does not modify the runlist at all, so the caller
|
|
* has to deal with it later.
|
|
*
|
|
* Return the number of deallocated clusters (not counting sparse ones) on
|
|
* success and -errno on error.
|
|
*
|
|
* Locking: - The runlist described by @vi must be unlocked on entry and is
|
|
* unlocked on return.
|
|
* - This function takes the runlist lock of @vi for reading and
|
|
* sometimes for writing and sometimes modifies the runlist.
|
|
* - The volume lcn bitmap must be unlocked on entry and is unlocked
|
|
* on return.
|
|
* - This function takes the volume lcn bitmap lock for writing and
|
|
* modifies the bitmap contents.
|
|
*/
|
|
static inline s64 ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
|
|
s64 count)
|
|
{
|
|
return __ntfs_cluster_free(vi, start_vcn, count, FALSE);
|
|
}
|
|
|
|
extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
|
|
const runlist_element *rl);
|
|
|
|
/**
|
|
* ntfs_cluster_free_from_rl - free clusters from runlist
|
|
* @vol: mounted ntfs volume on which to free the clusters
|
|
* @rl: runlist describing the clusters to free
|
|
*
|
|
* Free all the clusters described by the runlist @rl on the volume @vol. In
|
|
* the case of an error being returned, at least some of the clusters were not
|
|
* freed.
|
|
*
|
|
* Return 0 on success and -errno on error.
|
|
*
|
|
* Locking: This function takes the volume lcn bitmap lock for writing and
|
|
* modifies the bitmap contents.
|
|
*/
|
|
static inline int ntfs_cluster_free_from_rl(ntfs_volume *vol,
|
|
const runlist_element *rl)
|
|
{
|
|
int ret;
|
|
|
|
down_write(&vol->lcnbmp_lock);
|
|
ret = ntfs_cluster_free_from_rl_nolock(vol, rl);
|
|
up_write(&vol->lcnbmp_lock);
|
|
return ret;
|
|
}
|
|
|
|
#endif /* NTFS_RW */
|
|
|
|
#endif /* defined _LINUX_NTFS_LCNALLOC_H */
|