1/*-
2 * Copyright (c) 2010-2012 Semihalf.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/conf.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/malloc.h>
36#include <sys/mount.h>
37#include <sys/mutex.h>
38#include <sys/buf.h>
39#include <sys/namei.h>
40#include <sys/vnode.h>
41#include <sys/bio.h>
42
43#include <fs/nandfs/nandfs_mount.h>
44#include <fs/nandfs/nandfs.h>
45#include <fs/nandfs/nandfs_subr.h>
46
47struct buf *
48nandfs_geteblk(int size, int flags)
49{
50	struct buf *bp;
51
52	/*
53	 * XXX
54	 * Right now we can call geteblk with GB_NOWAIT_BD flag, which means
55	 * it can return NULL. But we cannot afford to get NULL, hence this panic.
56	 */
57	bp = geteblk(size, flags);
58	if (bp == NULL)
59		panic("geteblk returned NULL");
60
61	return (bp);
62}
63
64void
65nandfs_dirty_bufs_increment(struct nandfs_device *fsdev)
66{
67
68	mtx_lock(&fsdev->nd_mutex);
69	KASSERT(fsdev->nd_dirty_bufs >= 0, ("negative nd_dirty_bufs"));
70	fsdev->nd_dirty_bufs++;
71	mtx_unlock(&fsdev->nd_mutex);
72}
73
74void
75nandfs_dirty_bufs_decrement(struct nandfs_device *fsdev)
76{
77
78	mtx_lock(&fsdev->nd_mutex);
79	KASSERT(fsdev->nd_dirty_bufs > 0,
80	    ("decrementing not-positive nd_dirty_bufs"));
81	fsdev->nd_dirty_bufs--;
82	mtx_unlock(&fsdev->nd_mutex);
83}
84