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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/ntfs/lcnalloc.h | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/ntfs/lcnalloc.h')
-rw-r--r-- | fs/ntfs/lcnalloc.h | 112 |
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 */ |