bbf1813fb8
importantly to take a locked runlist rather than them locking it
which leads to lock reversal.
Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
115 lines
4.1 KiB
C
115 lines
4.1 KiB
C
/*
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* lcnalloc.h - Exports for NTFS kernel cluster (de)allocation. Part of the
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* Linux-NTFS project.
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*
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* Copyright (c) 2004 Anton Altaparmakov
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*
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* This program/include file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program/include file is distributed in the hope that it will be
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* useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (in the main directory of the Linux-NTFS
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* distribution in the file COPYING); if not, write to the Free Software
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* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _LINUX_NTFS_LCNALLOC_H
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#define _LINUX_NTFS_LCNALLOC_H
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#ifdef NTFS_RW
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#include <linux/fs.h>
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#include "types.h"
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#include "runlist.h"
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#include "volume.h"
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typedef enum {
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FIRST_ZONE = 0, /* For sanity checking. */
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MFT_ZONE = 0, /* Allocate from $MFT zone. */
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DATA_ZONE = 1, /* Allocate from $DATA zone. */
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LAST_ZONE = 1, /* For sanity checking. */
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} NTFS_CLUSTER_ALLOCATION_ZONES;
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extern runlist_element *ntfs_cluster_alloc(ntfs_volume *vol,
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const VCN start_vcn, const s64 count, const LCN start_lcn,
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const NTFS_CLUSTER_ALLOCATION_ZONES zone);
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extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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s64 count, const BOOL write_locked, const BOOL is_rollback);
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/**
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* ntfs_cluster_free - free clusters on an ntfs volume
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* @vi: vfs inode whose runlist describes the clusters to free
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* @start_vcn: vcn in the runlist of @vi at which to start freeing clusters
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* @count: number of clusters to free or -1 for all clusters
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* @write_locked: true if the runlist is locked for writing
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*
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* Free @count clusters starting at the cluster @start_vcn in the runlist
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* described by the vfs inode @vi.
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*
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* If @count is -1, all clusters from @start_vcn to the end of the runlist are
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* deallocated. Thus, to completely free all clusters in a runlist, use
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* @start_vcn = 0 and @count = -1.
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*
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* Note, ntfs_cluster_free() does not modify the runlist at all, so the caller
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* has to deal with it later.
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*
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* Return the number of deallocated clusters (not counting sparse ones) on
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* success and -errno on error.
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*
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* Locking: - The runlist described by @vi must be locked on entry and is
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* locked on return. Note if the runlist is locked for reading the
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* lock may be dropped and reacquired. Note the runlist may be
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* modified when needed runlist fragments need to be mapped.
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* - The volume lcn bitmap must be unlocked on entry and is unlocked
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* on return.
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* - This function takes the volume lcn bitmap lock for writing and
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* modifies the bitmap contents.
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*/
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static inline s64 ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
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s64 count, const BOOL write_locked)
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{
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return __ntfs_cluster_free(vi, start_vcn, count, write_locked, FALSE);
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}
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extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,
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const runlist_element *rl);
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/**
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* ntfs_cluster_free_from_rl - free clusters from runlist
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* @vol: mounted ntfs volume on which to free the clusters
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* @rl: runlist describing the clusters to free
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*
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* Free all the clusters described by the runlist @rl on the volume @vol. In
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* the case of an error being returned, at least some of the clusters were not
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* freed.
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*
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* Return 0 on success and -errno on error.
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*
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* Locking: - This function takes the volume lcn bitmap lock for writing and
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* modifies the bitmap contents.
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* - The caller must have locked the runlist @rl for reading or
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* writing.
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*/
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static inline int ntfs_cluster_free_from_rl(ntfs_volume *vol,
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const runlist_element *rl)
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{
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int ret;
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down_write(&vol->lcnbmp_lock);
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ret = ntfs_cluster_free_from_rl_nolock(vol, rl);
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up_write(&vol->lcnbmp_lock);
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return ret;
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}
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#endif /* NTFS_RW */
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#endif /* defined _LINUX_NTFS_LCNALLOC_H */
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