forked from luck/tmp_suning_uos_patched
715dc636b6
since we otherwise get into a lock reversal deadlock if a read locked
runlist is passed in. In the process also change it to take an ntfs
inode instead of a vfs inode as parameter.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/*
|
|
* lcnalloc.h - Exports for NTFS kernel cluster (de)allocation. Part of the
|
|
* Linux-NTFS project.
|
|
*
|
|
* Copyright (c) 2004-2005 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 "inode.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(ntfs_inode *ni, const VCN start_vcn,
|
|
s64 count, const BOOL is_rollback);
|
|
|
|
/**
|
|
* ntfs_cluster_free - free clusters on an ntfs volume
|
|
* @ni: ntfs inode whose runlist describes the clusters to free
|
|
* @start_vcn: vcn in the runlist of @ni 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 ntfs inode @ni.
|
|
*
|
|
* 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 @ni must be locked for writing on entry
|
|
* and is locked on return. Note the runlist may be modified when
|
|
* needed runlist fragments need to be mapped.
|
|
* - 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(ntfs_inode *ni, const VCN start_vcn,
|
|
s64 count)
|
|
{
|
|
return __ntfs_cluster_free(ni, 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.
|
|
* - The caller must have locked the runlist @rl for reading or
|
|
* writing.
|
|
*/
|
|
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 */
|