Spdk/test/unit/lib/blob/bs_dev_common.c

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 *       from this software without specific prior written permission.
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#include "spdk/io_channel.h"

#define DEV_BUFFER_SIZE (64 * 1024 * 1024)
#define DEV_BUFFER_BLOCKLEN (4096)
#define DEV_BUFFER_BLOCKCNT (DEV_BUFFER_SIZE / DEV_BUFFER_BLOCKLEN)
uint8_t *g_dev_buffer;

/* Define here for UT only. */
struct spdk_io_channel g_io_channel;

static struct spdk_io_channel *
dev_create_channel(struct spdk_bs_dev *dev)
{
	return &g_io_channel;
}

static void
dev_destroy_channel(struct spdk_bs_dev *dev, struct spdk_io_channel *channel)
{
}

static void
dev_destroy(struct spdk_bs_dev *dev)
{
	free(dev);
}

static void
dev_complete(void *arg)
{
	struct spdk_bs_dev_cb_args *cb_args = arg;

	cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0);
}

static void
dev_read(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload,
	 uint64_t lba, uint32_t lba_count,
	 struct spdk_bs_dev_cb_args *cb_args)
{
	uint64_t offset, length;

	offset = lba * DEV_BUFFER_BLOCKLEN;
	length = lba_count * DEV_BUFFER_BLOCKLEN;
	SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE);
	memcpy(payload, &g_dev_buffer[offset], length);
	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static void
dev_write(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload,
	  uint64_t lba, uint32_t lba_count,
	  struct spdk_bs_dev_cb_args *cb_args)
{
	uint64_t offset, length;

	offset = lba * DEV_BUFFER_BLOCKLEN;
	length = lba_count * DEV_BUFFER_BLOCKLEN;
	SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE);
	memcpy(&g_dev_buffer[offset], payload, length);
	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static void
__check_iov(struct iovec *iov, int iovcnt, uint64_t length)
{
	int i;

	for (i = 0; i < iovcnt; i++) {
		length -= iov[i].iov_len;
	}

	CU_ASSERT(length == 0);
}

static void
dev_readv(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
	  struct iovec *iov, int iovcnt,
	  uint64_t lba, uint32_t lba_count,
	  struct spdk_bs_dev_cb_args *cb_args)
{
	uint64_t offset, length;
	int i;

	offset = lba * DEV_BUFFER_BLOCKLEN;
	length = lba_count * DEV_BUFFER_BLOCKLEN;
	SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE);
	__check_iov(iov, iovcnt, length);

	for (i = 0; i < iovcnt; i++) {
		memcpy(iov[i].iov_base, &g_dev_buffer[offset], iov[i].iov_len);
		offset += iov[i].iov_len;
	}

	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static void
dev_writev(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
	   struct iovec *iov, int iovcnt,
	   uint64_t lba, uint32_t lba_count,
	   struct spdk_bs_dev_cb_args *cb_args)
{
	uint64_t offset, length;
	int i;

	offset = lba * DEV_BUFFER_BLOCKLEN;
	length = lba_count * DEV_BUFFER_BLOCKLEN;
	SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE);
	__check_iov(iov, iovcnt, length);

	for (i = 0; i < iovcnt; i++) {
		memcpy(&g_dev_buffer[offset], iov[i].iov_base, iov[i].iov_len);
		offset += iov[i].iov_len;
	}

	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static void
dev_flush(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
	  struct spdk_bs_dev_cb_args *cb_args)
{
	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static void
dev_unmap(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
	  uint64_t lba, uint32_t lba_count,
	  struct spdk_bs_dev_cb_args *cb_args)
{
	uint64_t offset, length;

	offset = lba * DEV_BUFFER_BLOCKLEN;
	length = lba_count * DEV_BUFFER_BLOCKLEN;
	SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE);
	memset(&g_dev_buffer[offset], 0, length);
	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static void
dev_write_zeroes(struct spdk_bs_dev *dev, struct spdk_io_channel *channel,
		 uint64_t lba, uint32_t lba_count,
		 struct spdk_bs_dev_cb_args *cb_args)
{
	uint64_t offset, length;

	offset = lba * DEV_BUFFER_BLOCKLEN;
	length = lba_count * DEV_BUFFER_BLOCKLEN;
	SPDK_CU_ASSERT_FATAL(offset + length <= DEV_BUFFER_SIZE);
	memset(&g_dev_buffer[offset], 0, length);
	spdk_thread_send_msg(spdk_get_thread(), dev_complete, cb_args);
}

static struct spdk_bs_dev *
init_dev(void)
{
	struct spdk_bs_dev *dev = calloc(1, sizeof(*dev));

	SPDK_CU_ASSERT_FATAL(dev != NULL);

	dev->create_channel = dev_create_channel;
	dev->destroy_channel = dev_destroy_channel;
	dev->destroy = dev_destroy;
	dev->read = dev_read;
	dev->write = dev_write;
	dev->readv = dev_readv;
	dev->writev = dev_writev;
	dev->flush = dev_flush;
	dev->unmap = dev_unmap;
	dev->write_zeroes = dev_write_zeroes;
	dev->blockcnt = DEV_BUFFER_BLOCKCNT;
	dev->blocklen = DEV_BUFFER_BLOCKLEN;

	return dev;
}