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authorscw <scw@NetBSD.org>2000-01-09 19:56:15 +0000
committerscw <scw@NetBSD.org>2000-01-09 19:56:15 +0000
commit2a8d425699b4883e951a5bdedd2a6c8f5a69434e (patch)
tree53375db004e79a3121682f819c30759242121e22 /lib/libc/db/mpool/mpool.c
parent3e70433d39a01db07ac9fd998b7b05de05d1c86e (diff)
After writing a page out to disk, run the page back through the user's
input filter to ensure we don't end up with a cached copy of the page in the wrong byte-order for the host cpu. This fixes a fatal bug which bites when the DB 'lorder' is different to the cpu's, and a cached page is accessed soon after it was flushed to disk.
Diffstat (limited to 'lib/libc/db/mpool/mpool.c')
-rw-r--r--lib/libc/db/mpool/mpool.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/libc/db/mpool/mpool.c b/lib/libc/db/mpool/mpool.c
index a00518255be..4322ef5f022 100644
--- a/lib/libc/db/mpool/mpool.c
+++ b/lib/libc/db/mpool/mpool.c
@@ -1,4 +1,4 @@
-/* $NetBSD: mpool.c,v 1.10 1998/12/09 12:42:51 christos Exp $ */
+/* $NetBSD: mpool.c,v 1.11 2000/01/09 19:56:15 scw Exp $ */
/*-
* Copyright (c) 1990, 1993, 1994
@@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "@(#)mpool.c 8.5 (Berkeley) 7/26/94";
#else
-__RCSID("$NetBSD: mpool.c,v 1.10 1998/12/09 12:42:51 christos Exp $");
+__RCSID("$NetBSD: mpool.c,v 1.11 2000/01/09 19:56:15 scw Exp $");
#endif
#endif /* LIBC_SCCS and not lint */
@@ -400,6 +400,15 @@ mpool_write(mp, bp)
if (pwrite(mp->fd, bp->page, (size_t)mp->pagesize, off) != (int)mp->pagesize)
return (RET_ERROR);
+ /*
+ * Re-run through the input filter since this page may soon be
+ * accessed via the cache, and whatever the user's output filter
+ * did may screw things up if we don't let the input filter
+ * restore the in-core copy.
+ */
+ if (mp->pgin)
+ (mp->pgin)(mp->pgcookie, bp->pgno, bp->page);
+
bp->flags &= ~MPOOL_DIRTY;
return (RET_SUCCESS);
}