Author: kib
Date: Mon Jan 14 05:41:40 2013
New Revision: 245406
URL: http://svnweb.freebsd.org/changeset/base/245406
Log:
Add exported vfs_hash_index() function, which calculates the canonical
pre-masked hash for the given vnode. The function assumes that
vp->v_hash is initialized by the filesystem vnode instantiation
function. At the moment, it is only done if filesystem uses
vfs_hash_insert().
Reviewed by: peter
Tested by: peter, pho (previous version)
Sponsored by: The FreeBSD Foundation
MFC after: 5 days
Modified:
head/sys/kern/vfs_hash.c
head/sys/sys/vnode.h
Modified: head/sys/kern/vfs_hash.c
==============================================================================
--- head/sys/kern/vfs_hash.c Mon Jan 14 05:40:21 2013 (r245405)
+++ head/sys/kern/vfs_hash.c Mon Jan 14 05:41:40 2013 (r245406)
@@ -54,6 +54,13 @@ vfs_hashinit(void *dummy __unused)
/* Must be SI_ORDER_SECOND so desiredvnodes is available */
SYSINIT(vfs_hash, SI_SUB_VFS, SI_ORDER_SECOND, vfs_hashinit, NULL);
+u_int
+vfs_hash_index(struct vnode *vp)
+{
+
+ return (vp->v_hash + vp->v_mount->mnt_hashseed);
+}
+
static struct vfs_hash_head *
vfs_hash_bucket(const struct mount *mp, u_int hash)
{
Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h Mon Jan 14 05:40:21 2013 (r245405)
+++ head/sys/sys/vnode.h Mon Jan 14 05:41:40 2013 (r245406)
@@ -812,6 +812,7 @@ int fifo_printinfo(struct vnode *);
typedef int vfs_hash_cmp_t(struct vnode *vp, void *arg);
int vfs_hash_get(const struct mount *mp, u_int hash, int flags, struct thread
*td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
+u_int vfs_hash_index(struct vnode *vp);
int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread
*td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
void vfs_hash_rehash(struct vnode *vp, u_int hash);
void vfs_hash_remove(struct vnode *vp);
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