Function vfs_hash_changesize

freebsd/kern/vfs_hash.c:201–236

}

void
vfs_hash_changesize(u_long newmaxvnodes)
{
	struct vfs_hash_head *vfs_hash_newtbl, *vfs_hash_oldtbl;
	u_long vfs_hash_newmask, vfs_hash_oldmask;
	struct vnode *vp;
	int i;

	vfs_hash_newtbl = hashinit(newmaxvnodes, M_VFS_HASH,
		&vfs_hash_newmask);
	/* If same hash table size, nothing to do */
	if (vfs_hash_mask == vfs_hash_newmask) {
		free(vfs_hash_newtbl, M_VFS_HASH);
		return;
	}
	/*
	 * Move everything from the old hash table to the new table.
	 * None of the vnodes in the table can be recycled because to
	 * do so, they have to be removed from the hash table.
	 */
	rw_wlock(&vfs_hash_lock);
	vfs_hash_oldtbl = vfs_hash_tbl;
	vfs_hash_oldmask = vfs_hash_mask;
	vfs_hash_tbl = vfs_hash_newtbl;
	vfs_hash_mask = vfs_hash_newmask;
	for (i = 0; i <= vfs_hash_oldmask; i++) {
		while ((vp = LIST_FIRST(&vfs_hash_oldtbl[i])) != NULL) {
			LIST_REMOVE(vp, v_hashlist);
			LIST_INSERT_HEAD(
			    vfs_hash_bucket(vp->v_mount, vp->v_hash),
			    vp, v_hashlist);
		}
	}
	rw_wunlock(&vfs_hash_lock);
	free(vfs_hash_oldtbl, M_VFS_HASH);
}