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

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);
+}