Rename ext4_filedev to file_dev

1 files changed, 142 insertions, 0 deletions

diff --git a/blockdev/linux/file_dev.c b/blockdev/linux/file_dev.c
new file mode 100644
index 0000000..dd0743b
--- /dev/null
+++ b/blockdev/linux/file_dev.c
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - 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.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ */
+
+#define _LARGEFILE64_SOURCE
+#define _FILE_OFFSET_BITS 64
+
+#include <ext4_config.h>
+#include <ext4_blockdev.h>
+#include <ext4_errno.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+
+/**@brief   Default filename.*/
+static const char *fname = "ext2";
+
+/**@brief   Image block size.*/
+#define EXT4_FILEDEV_BSIZE 512
+
+/**@brief   Image file descriptor.*/
+static FILE *dev_file;
+
+#define DROP_LINUXCACHE_BUFFERS 0
+
+/**********************BLOCKDEV INTERFACE**************************************/
+static int file_dev_open(struct ext4_blockdev *bdev);
+static int file_dev_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
+			 uint32_t blk_cnt);
+static int file_dev_bwrite(struct ext4_blockdev *bdev, const void *buf,
+			  uint64_t blk_id, uint32_t blk_cnt);
+static int file_dev_close(struct ext4_blockdev *bdev);
+
+/******************************************************************************/
+EXT4_BLOCKDEV_STATIC_INSTANCE(file_dev, EXT4_FILEDEV_BSIZE, 0, file_dev_open,
+		file_dev_bread, file_dev_bwrite, file_dev_close, 0, 0);
+
+/******************************************************************************/
+static int file_dev_open(struct ext4_blockdev *bdev)
+{
+	dev_file = fopen(fname, "r+b");
+
+	if (!dev_file)
+		return EIO;
+
+	/*No buffering at file.*/
+	setbuf(dev_file, 0);
+
+	if (fseeko(dev_file, 0, SEEK_END))
+		return EFAULT;
+
+	file_dev.part_offset = 0;
+	file_dev.part_size = ftello(dev_file);
+	file_dev.bdif->ph_bcnt = file_dev.part_size / file_dev.bdif->ph_bsize;
+
+	return EOK;
+}
+
+/******************************************************************************/
+
+static int file_dev_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
+			 uint32_t blk_cnt)
+{
+	if (fseeko(dev_file, blk_id * bdev->bdif->ph_bsize, SEEK_SET))
+		return EIO;
+	if (!blk_cnt)
+		return EOK;
+	if (!fread(buf, bdev->bdif->ph_bsize * blk_cnt, 1, dev_file))
+		return EIO;
+
+	return EOK;
+}
+
+static void drop_cache(void)
+{
+#if defined(__linux__) && DROP_LINUXCACHE_BUFFERS
+	int fd;
+	char *data = "3";
+
+	sync();
+	fd = open("/proc/sys/vm/drop_caches", O_WRONLY);
+	write(fd, data, sizeof(char));
+	close(fd);
+#endif
+}
+
+/******************************************************************************/
+static int file_dev_bwrite(struct ext4_blockdev *bdev, const void *buf,
+			  uint64_t blk_id, uint32_t blk_cnt)
+{
+	if (fseeko(dev_file, blk_id * bdev->bdif->ph_bsize, SEEK_SET))
+		return EIO;
+	if (!blk_cnt)
+		return EOK;
+	if (!fwrite(buf, bdev->bdif->ph_bsize * blk_cnt, 1, dev_file))
+		return EIO;
+
+	drop_cache();
+	return EOK;
+}
+/******************************************************************************/
+static int file_dev_close(struct ext4_blockdev *bdev)
+{
+	fclose(dev_file);
+	return EOK;
+}
+
+/******************************************************************************/
+struct ext4_blockdev *file_dev_get(void)
+{
+	return &file_dev;
+}
+/******************************************************************************/
+void file_dev_name_set(const char *n)
+{
+	fname = n;
+}
+/******************************************************************************/