diff options
| author |   tholo <tholo@openbsd.org> | 1996-06-26 19:44:59 +0000 |
|---|---|---|
| committer | tholo <tholo@openbsd.org> | 1996-06-26 19:44:59 +0000 |
| commit | f9fa4019fc32d962317c1afac639d27868e516a7 (patch) | |
| tree | 69f27d034f8f5bf97a25f2373f4c0d03fb24741f | |
| parent | Print empty TCP flags checks (like '/SA' ) properly (diff) | |
| download | wireguard-openbsd-f9fa4019fc32d962317c1afac639d27868e516a7.tar.xz wireguard-openbsd-f9fa4019fc32d962317c1afac639d27868e516a7.zip | |
When a dirty buffer is written to, don't move it to the tail of the
dirty list. Doing that can, for a block that is written to with a
period of less than 30 seconds, cause the block to never be flushed
to disk. Idea from Jeffrey Mogul's paper covering the same basic
changes.
| -rw-r--r-- | sys/kern/vfs_bio.c | 23 |
1 files changed, 1 insertions, 22 deletions
diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c index d0d1b1efd0a..f2db58ffa1d 100644 --- a/sys/kern/vfs_bio.c +++ b/sys/kern/vfs_bio.c @@ -1,4 +1,4 @@ -/* $OpenBSD: vfs_bio.c,v 1.7 1996/06/14 06:36:24 deraadt Exp $ */ +/* $OpenBSD: vfs_bio.c,v 1.8 1996/06/26 19:44:59 tholo Exp $ */ /* $NetBSD: vfs_bio.c,v 1.44 1996/06/11 11:15:36 pk Exp $ */ /*- @@ -404,27 +404,6 @@ bdwrite(bp) curproc->p_stats->p_ru.ru_oublock++; /* XXX */ reassignbuf(bp, bp->b_vp); } - else { - /* - * The buffer has been rewritten. Move it to the - * end of the dirty block list, and if it was the - * first entry before being moved, reschedule the - * timeout - */ - if (bdirties.tqh_first == bp) { - untimeout((void (*)__P((void *)))wakeup, - &bdirties); - setit = 1; - } - else - setit = 0; - TAILQ_REMOVE(&bdirties, bp, b_synclist); - TAILQ_INSERT_TAIL(&bdirties, bp, b_synclist); - if (setit && bdirties.tqh_first != bp) - timeout((void (*)__P((void *)))wakeup, - &bdirties, - (bdirties.tqh_first->b_synctime - time.tv_sec) * hz); - } /* If this is a tape block, write the block now. */ if (bdevsw[major(bp->b_dev)].d_type == D_TAPE) { |