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ntfs-3g
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Fix compilation. 

2002/12/27 16:03:18+00:00 cantab.net!aia21
Implement ntfs_cluster_free().

(Logical change 1.59)
edge.strict_endians
cantab.net!aia21 2002-12-27 16:18:10 +00:00
parent bccfbfbff4
commit d761ee8105
1 changed files with 100 additions and 13 deletions
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113
libntfs/lcnalloc.c
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@ -19,19 +19,16 @@
* Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//#include <stdio.h>
//#include <string.h>
//#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "types.h"
#include "attrib.h"
#include "bitmap.h"
#include "runlist.h"
#include "volume.h"
#include "lcnalloc.h"
//#include "debug.h"
/**
* ntfs_cluster_alloc - allocate clusters on an ntfs volume
@ -60,12 +57,12 @@ runlist *ntfs_cluster_alloc(ntfs_volume *vol, s64 count, LCN start_lcn)
/**
* ntfs_cluster_free - free clusters on an ntfs volume
* @vol: mounted ntfs volume on which to free the clusters
* @rl: runlist describing the clusters to free
* @start_vcn: starting relative vcn into @rl at which to free the clusters
* @na: attribute whose runlist describes the clusters to free
* @start_vcn: vcn in @rl 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 @rl
* from the mounted ntfs volume @vol.
* Free @count clusters starting at the cluster @start_vcn in the runlist
* described by the attribute @na from the mounted ntfs volume @vol.
*
* If @count is -1, all clusters from @start_vcn to the end of the runlist
* are deallocated.
@ -73,14 +70,104 @@ runlist *ntfs_cluster_alloc(ntfs_volume *vol, s64 count, LCN start_lcn)
* On success return the number of deallocated clusters (not counting sparse
* clusters) and on error return -1 with errno set to the error code.
*/
int ntfs_cluster_free(ntfs_volume *vol, runlist *rl, VCN start_vcn, s64 count)
int ntfs_cluster_free(ntfs_volume *vol, ntfs_attr *na, VCN start_vcn, s64 count)
{
if (!vol || !rl || start_vcn < 0 || count < 0 || !vol->lcnbmp_na) {
runlist *rl;
s64 nr_freed, delta, to_free;
if (!vol || !vol->lcnbmp_na || !na || !na->rl || start_vcn < 0 ||
(count < 0 && count != -1)) {
errno = EINVAL;
return -1;
}
errno = ENOTSUP;
return -1;
rl = ntfs_attr_find_vcn(na, start_vcn);
if (!rl)
return -1;
if (rl->lcn < 0 && rl->lcn != LCN_HOLE) {
errno = EIO;
return -1;
}
/* Find the starting cluster inside the run that needs freeing. */
delta = start_vcn - rl->vcn;
/* The number of clusters in this run that need freeing. */
to_free = rl->length - delta;
if (count >= 0 && to_free > count)
to_free = count;
if (rl->lcn != LCN_HOLE) {
/* Do the actual freeing of the clusters in this run. */
if (ntfs_bitmap_clear_run(vol->lcnbmp_na, rl->lcn + delta,
to_free))
return -1;
/* We have freed @to_free real clusters. */
nr_freed = to_free;
} else {
/* No real clusters were freed. */
nr_freed = 0;
}
/* Go to the next run and adjust the number of clusters left to free. */
++rl;
if (count >= 0)
count -= to_free;
/*
* Loop over the remaining runs, using @count as a capping value, and
* free them.
*/
for (; rl->length && count != 0; ++rl) {
// FIXME: Need to try ntfs_attr_map_runlist() for attribute
// list support! (AIA)
if (rl->lcn < 0 && rl->lcn != LCN_HOLE) {
// FIXME: Eeek! We need rollback! (AIA)
fprintf(stderr, "%s(): Eeek! invalid lcn (= %Li). "
"Should attempt to map runlist! "
"Leaving inconsistent metadata!\n",
__FUNCTION__, (long long)rl->lcn);
errno = EIO;
return -1;
}
/* The number of clusters in this run that need freeing. */
to_free = rl->length;
if (count >= 0 && to_free > count)
to_free = count;
if (rl->lcn != LCN_HOLE) {
/* Do the actual freeing of the clusters in the run. */
if (ntfs_bitmap_clear_run(vol->lcnbmp_na, rl->lcn,
to_free)) {
int eo = errno;
// FIXME: Eeek! We need rollback! (AIA)
fprintf(stderr, "%s(): Eeek! bitmap clear run "
"failed. Leaving inconsistent "
"metadata!\n", __FUNCTION__);
errno = eo;
return -1;
}
/* We have freed @to_free real clusters. */
nr_freed += to_free;
}
if (count >= 0)
count -= to_free;
}
if (count != -1 && count != 0) {
// FIXME: Eeek! BUG()
fprintf(stderr, "%s(): Eeek! count still not zero (= %Li). "
"Leaving inconsistent metadata!\n",
__FUNCTION__, (long long)count);
errno = EIO;
return -1;
}
/* Done. Return the number of actual clusters that were freed. */
return nr_freed;
}