Adjust some variables (mostly related to the buffer cache) that hold

address space sizes to be longs instead of ints.  Specifically, the follow
values are now longs: runningbufspace, bufspace, maxbufspace,
bufmallocspace, maxbufmallocspace, lobufspace, hibufspace, lorunningspace,
hirunningspace, maxswzone, maxbcache, and maxpipekva.  Previously, a
relatively small number (~ 44000) of buffers set in kern.nbuf would result
in integer overflows resulting either in hangs or bogus values of
hidirtybuffers and lodirtybuffers.  Now one has to overflow a long to see
such problems.  There was a check for a nbuf setting that would cause
overflows in the auto-tuning of nbuf.  I've changed it to always check and
cap nbuf but warn if a user-supplied tunable would cause overflow.

Note that this changes the ABI of several sysctls that are used by things
like top(1), etc., so any MFC would probably require a some gross shims
to allow for that.

MFC after:	1 month

2 files changed, 3 insertions, 3 deletions

diff --git a/sys/ufs/ffs/ffs_snapshot.c b/sys/ufs/ffs/ffs_snapshot.c
index dff56ed..b45532e 100644
--- a/sys/ufs/ffs/ffs_snapshot.c
+++ b/sys/ufs/ffs/ffs_snapshot.c
@@ -2229,7 +2229,7 @@ ffs_copyonwrite(devvp, bp)
 			VI_UNLOCK(devvp);
 			if (saved_runningbufspace != 0) {
 				bp->b_runningbufspace = saved_runningbufspace;
-				atomic_add_int(&runningbufspace,
+				atomic_add_long(&runningbufspace,
 					       bp->b_runningbufspace);
 			}
 			return (0);		/* Snapshot gone */
@@ -2354,7 +2354,7 @@ ffs_copyonwrite(devvp, bp)
 	 */
 	if (saved_runningbufspace != 0) {
 		bp->b_runningbufspace = saved_runningbufspace;
-		atomic_add_int(&runningbufspace, bp->b_runningbufspace);
+		atomic_add_long(&runningbufspace, bp->b_runningbufspace);
 	}
 	return (error);
 }
diff --git a/sys/ufs/ffs/ffs_vfsops.c b/sys/ufs/ffs/ffs_vfsops.c
index 3e0760f..3913d79 100644
--- a/sys/ufs/ffs/ffs_vfsops.c
+++ b/sys/ufs/ffs/ffs_vfsops.c
@@ -1915,7 +1915,7 @@ ffs_geom_strategy(struct bufobj *bo, struct buf *bp)
 					}
 				}
 				bp->b_runningbufspace = bp->b_bufsize;
-				atomic_add_int(&runningbufspace,
+				atomic_add_long(&runningbufspace,
 					       bp->b_runningbufspace);
 			} else {
 				error = ffs_copyonwrite(vp, bp);