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NTFS: Change ntfs_cluster_free() to require a write locked runlist on entry

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since we otherwise get into a lock reversal deadlock if a read locked
      runlist is passed in. In the process also change it to take an ntfs
      inode instead of a vfs inode as parameter.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-09-23 11:24:28 +01:00
parent 91fbc6edfa
commit 715dc636b6
5 changed files with 32 additions and 34 deletions
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27
fs/ntfs/lcnalloc.h
View file

@ -2,7 +2,7 @@
* lcnalloc.h - Exports for NTFS kernel cluster (de)allocation. Part of the
* Linux-NTFS project.
*
* Copyright (c) 2004 Anton Altaparmakov
* Copyright (c) 2004-2005 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
@ -28,6 +28,7 @@
#include <linux/fs.h>
#include "types.h"
#include "inode.h"
#include "runlist.h"
#include "volume.h"
@ -42,18 +43,17 @@ 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 write_locked, const BOOL is_rollback);
extern s64 __ntfs_cluster_free(ntfs_inode *ni, 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
* @ni: ntfs inode whose runlist describes the clusters to free
* @start_vcn: vcn in the runlist of @ni at which to start freeing clusters
* @count: number of clusters to free or -1 for all clusters
* @write_locked: true if the runlist is locked for writing
*
* Free @count clusters starting at the cluster @start_vcn in the runlist
* described by the vfs inode @vi.
* described by the ntfs inode @ni.
*
* 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
@ -65,19 +65,18 @@ extern s64 __ntfs_cluster_free(struct inode *vi, const VCN start_vcn,
* Return the number of deallocated clusters (not counting sparse ones) on
* success and -errno on error.
*
* Locking: - The runlist described by @vi must be locked on entry and is
* locked on return. Note if the runlist is locked for reading the
* lock may be dropped and reacquired. Note the runlist may be
* modified when needed runlist fragments need to be mapped.
* Locking: - The runlist described by @ni must be locked for writing on entry
* and is locked on return. Note the runlist may be modified when
* needed runlist fragments need to be mapped.
* - 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, const BOOL write_locked)
static inline s64 ntfs_cluster_free(ntfs_inode *ni, const VCN start_vcn,
s64 count)
{
return __ntfs_cluster_free(vi, start_vcn, count, write_locked, FALSE);
return __ntfs_cluster_free(ni, start_vcn, count, FALSE);
}
extern int ntfs_cluster_free_from_rl_nolock(ntfs_volume *vol,