1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2010-2012 Semihalf.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/param.h>
33 #include <sys/systm.h>
34 #include <sys/conf.h>
35 #include <sys/kernel.h>
36 #include <sys/lock.h>
37 #include <sys/malloc.h>
38 #include <sys/mount.h>
39 #include <sys/mutex.h>
40 #include <sys/buf.h>
41 #include <sys/namei.h>
42 #include <sys/vnode.h>
43 #include <sys/bio.h>
44
45 #include <fs/nandfs/nandfs_mount.h>
46 #include <fs/nandfs/nandfs.h>
47 #include <fs/nandfs/nandfs_subr.h>
48
49 struct buf *
50 nandfs_geteblk(int size, int flags)
51 {
52 struct buf *bp;
53
54 /*
55 * XXX
56 * Right now we can call geteblk with GB_NOWAIT_BD flag, which means
57 * it can return NULL. But we cannot afford to get NULL, hence this panic.
58 */
59 bp = geteblk(size, flags);
60 if (bp == NULL)
61 panic("geteblk returned NULL");
62
63 return (bp);
64 }
65
66 void
67 nandfs_dirty_bufs_increment(struct nandfs_device *fsdev)
68 {
69
70 mtx_lock(&fsdev->nd_mutex);
71 KASSERT(fsdev->nd_dirty_bufs >= 0, ("negative nd_dirty_bufs"));
72 fsdev->nd_dirty_bufs++;
73 mtx_unlock(&fsdev->nd_mutex);
74 }
75
76 void
77 nandfs_dirty_bufs_decrement(struct nandfs_device *fsdev)
78 {
79
80 mtx_lock(&fsdev->nd_mutex);
81 KASSERT(fsdev->nd_dirty_bufs > 0,
82 ("decrementing not-positive nd_dirty_bufs"));
83 fsdev->nd_dirty_bufs--;
84 mtx_unlock(&fsdev->nd_mutex);
85 }
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