Author: kib
Date: Wed May 11 06:32:22 2016
New Revision: 299412
URL: https://svnweb.freebsd.org/changeset/base/299412
Log:
Add vfs_hash_ref(9) function, which finds a vnode by the hash value
and returns it referenced.
The function is similar to vfs_hash_get(9), but unlike the later,
returned vnode is not locked. This operation cannot be requested with
the vget(9) flags.
Reviewed and tested by: rmacklem
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
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 Wed May 11 06:29:07 2016 (r299411)
+++ head/sys/kern/vfs_hash.c Wed May 11 06:32:22 2016 (r299412)
@@ -104,6 +104,36 @@ vfs_hash_get(const struct mount *mp, u_i
}
void
+vfs_hash_ref(const struct mount *mp, u_int hash, struct thread *td,
+ struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg)
+{
+ struct vnode *vp;
+
+ while (1) {
+ rw_rlock(&vfs_hash_lock);
+ LIST_FOREACH(vp, vfs_hash_bucket(mp, hash), v_hashlist) {
+ if (vp->v_hash != hash)
+ continue;
+ if (vp->v_mount != mp)
+ continue;
+ if (fn != NULL && fn(vp, arg))
+ continue;
+ vhold(vp);
+ rw_runlock(&vfs_hash_lock);
+ vref(vp);
+ vdrop(vp);
+ *vpp = vp;
+ return;
+ }
+ if (vp == NULL) {
+ rw_runlock(&vfs_hash_lock);
+ *vpp = NULL;
+ return;
+ }
+ }
+}
+
+void
vfs_hash_remove(struct vnode *vp)
{
Modified: head/sys/sys/vnode.h
==============================================================================
--- head/sys/sys/vnode.h Wed May 11 06:29:07 2016 (r299411)
+++ head/sys/sys/vnode.h Wed May 11 06:32:22 2016 (r299412)
@@ -859,6 +859,8 @@ int vfs_hash_get(const struct mount *mp,
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_ref(const struct mount *mp, u_int hash, 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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