This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / ntfs / lcnalloc.h

diff --git a/fs/ntfs/lcnalloc.h b/fs/ntfs/lcnalloc.h
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+/*
+ * 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 "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);
+}
+
+#endif /* NTFS_RW */
+
+#endif /* defined _LINUX_NTFS_LCNALLOC_H */