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: releng/10.2/sys/fs/nandfs/nandfs_buffer.c 235537 2012-05-17 10:11:18Z gber $"); 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