Eliminated many redundant vm_map_lookup operations for vm_mmap.

Speed up for vfs_bio -- addition of a routine bqrelse to greatly diminish
	overhead for merged cache.
Efficiency improvement for vfs_cluster.  It used to do alot of redundant
	calls to cluster_rbuild.
Correct the ordering for vrele of .text and release of credentials.
Use the selective tlb update for 486/586/P6.
Numerous fixes to the size of objects allocated for files.  Additionally,
	fixes in the various pagers.
Fixes for proper positioning of vnode_pager_setsize in msdosfs and ext2fs.
Fixes in the swap pager for exhausted resources.  The pageout code
	will not as readily thrash.
Change the page queue flags (PG_ACTIVE, PG_INACTIVE, PG_FREE, PG_CACHE) into
	page queue indices (PQ_ACTIVE, PQ_INACTIVE, PQ_FREE, PQ_CACHE),
	thereby improving efficiency of several routines.
Eliminate even more unnecessary vm_page_protect operations.
Significantly speed up process forks.
Make vm_object_page_clean more efficient, thereby eliminating the pause
	that happens every 30seconds.
Make sequential clustered writes B_ASYNC instead of B_DELWRI even in the
	case of filesystems mounted async.
Fix a panic with busy pages when write clustering is done for non-VMIO
	buffers.

1 files changed, 6 insertions, 3 deletions

diff --git a/sys/gnu/ext2fs/ext2_readwrite.c b/sys/gnu/ext2fs/ext2_readwrite.c
index 093f7fb..478f0d2 100644
--- a/sys/gnu/ext2fs/ext2_readwrite.c
+++ b/sys/gnu/ext2fs/ext2_readwrite.c
@@ -120,8 +120,11 @@ READ(ap)
 			    size, &nextlbn, &nextsize, 1, NOCRED, &bp);
 		} else
 			error = bread(vp, lbn, size, NOCRED, &bp);
-		if (error)
+		if (error) {
+			brelse(bp);
+			bp = NULL;
 			break;
+		}
 		vp->v_lastr = lbn;
 
 		/*
@@ -148,10 +151,10 @@ READ(ap)
 		    uio->uio_offset == ip->i_size))
 			bp->b_flags |= B_AGE;
 #endif
-		brelse(bp);
+		bqrelse(bp);
 	}
 	if (bp != NULL)
-		brelse(bp);
+		bqrelse(bp);
 	ip->i_flag |= IN_ACCESS;
 	return (error);
 }