/* * 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 */