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
This commit is contained in:
parent
8b94864213
commit
54a33d2f97
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=299412
@ -103,6 +103,36 @@ vfs_hash_get(const struct mount *mp, u_int hash, int flags, struct thread *td,
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}
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}
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void
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vfs_hash_ref(const struct mount *mp, u_int hash, struct thread *td,
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struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg)
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{
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struct vnode *vp;
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while (1) {
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rw_rlock(&vfs_hash_lock);
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LIST_FOREACH(vp, vfs_hash_bucket(mp, hash), v_hashlist) {
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if (vp->v_hash != hash)
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continue;
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if (vp->v_mount != mp)
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continue;
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if (fn != NULL && fn(vp, arg))
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continue;
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vhold(vp);
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rw_runlock(&vfs_hash_lock);
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vref(vp);
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vdrop(vp);
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*vpp = vp;
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return;
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}
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if (vp == NULL) {
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rw_runlock(&vfs_hash_lock);
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*vpp = NULL;
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return;
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}
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}
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}
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void
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vfs_hash_remove(struct vnode *vp)
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{
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@ -859,6 +859,8 @@ int vfs_hash_get(const struct mount *mp, u_int hash, int flags,
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u_int vfs_hash_index(struct vnode *vp);
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int vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td,
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struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
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void vfs_hash_ref(const struct mount *mp, u_int hash, struct thread *td,
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struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg);
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void vfs_hash_rehash(struct vnode *vp, u_int hash);
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void vfs_hash_remove(struct vnode *vp);
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