1 files changed, 112 insertions, 0 deletions

diff --git a/fs/ntfs/lcnalloc.h b/fs/ntfs/lcnalloc.h
new file mode 100644
index 000000000000..4cac1c024af6
--- /dev/null
+++ b/fs/ntfs/lcnalloc.h
@@ -0,0 +1,112 @@
+/*
+ * 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 */