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Clarify the dirhash locking protocol and remove unnessiary #ifdef DEBUG

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This commit is contained in:
reinoud 2008-10-31 16:04:59 +00:00
parent a2a624b32c
commit 54977cd016
1 changed files with 15 additions and 4 deletions
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19
sys/kern/vfs_dirhash.c
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@ -1,4 +1,4 @@
/* $NetBSD: vfs_dirhash.c,v 1.7 2008/10/31 15:48:39 reinoud Exp $ */
/* $NetBSD: vfs_dirhash.c,v 1.8 2008/10/31 16:04:59 reinoud Exp $ */
/*
* Copyright (c) 2008 Reinoud Zandijk
@ -28,7 +28,7 @@
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: vfs_dirhash.c,v 1.7 2008/10/31 15:48:39 reinoud Exp $");
__KERNEL_RCSID(0, "$NetBSD: vfs_dirhash.c,v 1.8 2008/10/31 16:04:59 reinoud Exp $");
/* CLEAN UP! */
#include <sys/param.h>
@ -50,6 +50,19 @@ __KERNEL_RCSID(0, "$NetBSD: vfs_dirhash.c,v 1.7 2008/10/31 15:48:39 reinoud Exp
# define DPRINTF(a) printf(a);
#endif
/*
* The locking protocol of the dirhash structures is fairly simple:
*
* The global dirhash_queue is protected by the dirhashmutex. This lock is
* internal only and is FS/mountpoint/vnode independent. On exit of the
* exported functions this mutex is not helt.
*
* The dirhash structure is considered part of the vnode/inode/udf_node
* structure and will thus use the lock that protects that vnode/inode.
*
* The dirhash entries are considered part of the dirhash structure and thus
* are on the same lock.
*/
static struct sysctllog *sysctl_log;
static struct pool dirhash_pool;
@ -313,12 +326,10 @@ dirhash_enter_freed(struct dirhash *dirh, uint64_t offset,
KASSERT(dirh);
KASSERT(dirh->refcnt > 0);
#ifdef DEBUG
/* check for double entry of free space */
LIST_FOREACH(dirh_e, &dirh->free_entries, next) {
KASSERT(dirh_e->offset != offset);
}
#endif
DPRINTF(("dirhash enter FREED %"PRIu64", %d\n",
offset, entry_size));