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Because buffers may be tossed and recreated at will under the new VM

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system, the mapping from logical to physical block number may be lost.
Hence we have to check for a reconstituted buffer and redo the call to
VOP_BMAP if the physical block number has been lost.
This commit is contained in:
Kirk McKusick 1998-11-17 00:31:12 +00:00
parent 9ba91dd44b
commit 96334b8fc8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=41205
1 changed files with 9 additions and 4 deletions
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13
sys/kern/vfs_cluster.c
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@ -33,7 +33,7 @@
* SUCH DAMAGE.
*
* @(#)vfs_cluster.c 8.7 (Berkeley) 2/13/94
* $Id: vfs_cluster.c,v 1.72 1998/11/13 01:01:40 dg Exp $
* $Id: vfs_cluster.c,v 1.73 1998/11/15 14:11:06 bde Exp $
*/
#include "opt_debug_cluster.h"
@ -823,6 +823,7 @@ cluster_collectbufs(vp, last_bp)
struct buf *last_bp;
{
struct cluster_save *buflist;
struct buf *bp;
daddr_t lbn;
int i, len;
@ -831,9 +832,13 @@ cluster_collectbufs(vp, last_bp)
M_SEGMENT, M_WAITOK);
buflist->bs_nchildren = 0;
buflist->bs_children = (struct buf **) (buflist + 1);
for (lbn = vp->v_cstart, i = 0; i < len; lbn++, i++)
(void) bread(vp, lbn, last_bp->b_bcount, NOCRED,
&buflist->bs_children[i]);
for (lbn = vp->v_cstart, i = 0; i < len; lbn++, i++) {
(void) bread(vp, lbn, last_bp->b_bcount, NOCRED, &bp);
buflist->bs_children[i] = bp;
if (bp->b_blkno == bp->b_lblkno)
VOP_BMAP(bp->b_vp, bp->b_lblkno, NULL, &bp->b_blkno,
NULL, NULL);
}
buflist->bs_children[i] = last_bp;
buflist->bs_nchildren = i + 1;
return (buflist);