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The NAND Flash environment consists of several distinct components: - NAND framework (drivers harness for NAND controllers and NAND chips) - NAND simulator (NANDsim) - NAND file system (NAND FS) - Companion tools and utilities - Documentation (manual pages) This work is still experimental. Please use with caution. Obtained from: Semihalf Supported by: FreeBSD Foundation, Juniper Networks
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*-
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* Copyright (c) 2010-2012 Semihalf.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/mutex.h>
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#include <sys/buf.h>
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#include <sys/namei.h>
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#include <sys/vnode.h>
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#include <sys/bio.h>
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#include <fs/nandfs/nandfs_mount.h>
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#include <fs/nandfs/nandfs.h>
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#include <fs/nandfs/nandfs_subr.h>
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struct buf *
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nandfs_geteblk(int size, int flags)
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{
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struct buf *bp;
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/*
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* XXX
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* Right now we can call geteblk with GB_NOWAIT_BD flag, which means
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* it can return NULL. But we cannot afford to get NULL, hence this panic.
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*/
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bp = geteblk(size, flags);
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if (bp == NULL)
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panic("geteblk returned NULL");
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return (bp);
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}
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void
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nandfs_dirty_bufs_increment(struct nandfs_device *fsdev)
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{
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mtx_lock(&fsdev->nd_mutex);
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KASSERT(fsdev->nd_dirty_bufs >= 0, ("negative nd_dirty_bufs"));
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fsdev->nd_dirty_bufs++;
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mtx_unlock(&fsdev->nd_mutex);
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}
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void
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nandfs_dirty_bufs_decrement(struct nandfs_device *fsdev)
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{
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mtx_lock(&fsdev->nd_mutex);
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KASSERT(fsdev->nd_dirty_bufs > 0,
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("decrementing not-positive nd_dirty_bufs"));
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fsdev->nd_dirty_bufs--;
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mtx_unlock(&fsdev->nd_mutex);
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}
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