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author | gber <gber@FreeBSD.org> | 2012-05-17 10:11:18 +0000 |
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committer | gber <gber@FreeBSD.org> | 2012-05-17 10:11:18 +0000 |
commit | 6f7c7353004e2ff9709b326a4008ce8ea63d9270 (patch) | |
tree | a325137a898341311de8641f7212e28b7d87950e /sys/fs/nandfs/nandfs_buffer.c | |
parent | 661b9d94414ea6d11d5b7960aef1f172975ce52b (diff) | |
download | FreeBSD-src-6f7c7353004e2ff9709b326a4008ce8ea63d9270.zip FreeBSD-src-6f7c7353004e2ff9709b326a4008ce8ea63d9270.tar.gz |
Import work done under project/nand (@235533) into head.
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
Diffstat (limited to 'sys/fs/nandfs/nandfs_buffer.c')
-rw-r--r-- | sys/fs/nandfs/nandfs_buffer.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/sys/fs/nandfs/nandfs_buffer.c b/sys/fs/nandfs/nandfs_buffer.c new file mode 100644 index 0000000..b0d72668 --- /dev/null +++ b/sys/fs/nandfs/nandfs_buffer.c @@ -0,0 +1,83 @@ +/*- + * Copyright (c) 2010-2012 Semihalf. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/conf.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mount.h> +#include <sys/mutex.h> +#include <sys/buf.h> +#include <sys/namei.h> +#include <sys/vnode.h> +#include <sys/bio.h> + +#include <fs/nandfs/nandfs_mount.h> +#include <fs/nandfs/nandfs.h> +#include <fs/nandfs/nandfs_subr.h> + +struct buf * +nandfs_geteblk(int size, int flags) +{ + struct buf *bp; + + /* + * XXX + * Right now we can call geteblk with GB_NOWAIT_BD flag, which means + * it can return NULL. But we cannot afford to get NULL, hence this panic. + */ + bp = geteblk(size, flags); + if (bp == NULL) + panic("geteblk returned NULL"); + + return (bp); +} + +void +nandfs_dirty_bufs_increment(struct nandfs_device *fsdev) +{ + + mtx_lock(&fsdev->nd_mutex); + KASSERT(fsdev->nd_dirty_bufs >= 0, ("negative nd_dirty_bufs")); + fsdev->nd_dirty_bufs++; + mtx_unlock(&fsdev->nd_mutex); +} + +void +nandfs_dirty_bufs_decrement(struct nandfs_device *fsdev) +{ + + mtx_lock(&fsdev->nd_mutex); + KASSERT(fsdev->nd_dirty_bufs > 0, + ("decrementing not-positive nd_dirty_bufs")); + fsdev->nd_dirty_bufs--; + mtx_unlock(&fsdev->nd_mutex); +} |