Commit 8970f868 authored by Ben Walker's avatar Ben Walker Committed by Jim Harris
Browse files

blob: Add a bs_dev that always returns 0 



This will be useful for backing thin provisioned
blobs in the future.

Change-Id: I78cf8cda39e8dff42da69b79ed460797d7494af1
Signed-off-by: default avatarBen Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/397043


Reviewed-by: default avatarDaniel Verkamp <daniel.verkamp@intel.com>
Tested-by: default avatarSPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: default avatarJim Harris <james.r.harris@intel.com>
parent dc82989d

lib/blob/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -34,7 +34,7 @@ 
SPDK_ROOT_DIR := $(abspath $(CURDIR)/../..)

include $(SPDK_ROOT_DIR)/mk/spdk.common.mk



C_SRCS = blobstore.c request.c

C_SRCS = blobstore.c request.c zeroes.c

LIBNAME = blob



DIRS-y += bdev

lib/blob/blobstore.h

+2 −0
Original line number Diff line number Diff line
@@ -325,6 +325,8 @@ SPDK_STATIC_ASSERT(sizeof(struct spdk_bs_super_block) == 0x1000, "Invalid super 


#pragma pack(pop)



struct spdk_bs_dev *spdk_bs_create_zeroes_dev(void);



/* Unit Conversions

 *

 * The blobstore works with several different units:

lib/blob/zeroes.c

0 → 100644
+122 −0
Original line number Diff line number Diff line 
/*-

 *   BSD LICENSE

 *

 *   Copyright (c) Intel Corporation.

 *   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.

 *     * Neither the name of Intel Corporation nor the names of its

 *       contributors may be used to endorse or promote products derived

 *       from this software without specific prior written permission.

 *

 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT

 *   OWNER 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 "spdk/stdinc.h"

#include "spdk/blob.h"



#include "blobstore.h"



static void

zeroes_destroy(struct spdk_bs_dev *bs_dev)

{

	return;

}



static void

zeroes_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)

{

	memset(payload, 0, dev->blocklen * lba_count);

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

}



static void

zeroes_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)

{

	cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);

	assert(false);

}



static void

zeroes_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)

{

	int i;



	for (i = 0; i < iovcnt; i++) {

		memset(iov[i].iov_base, 0, iov[i].iov_len);

	}



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

}







static void

zeroes_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)

{

	cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, -EPERM);

	assert(false);

}



static void

zeroes_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)

{

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

}



static void

zeroes_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)

{

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

}



static struct spdk_bs_dev g_zeroes_bs_dev = {

	.blockcnt = UINT64_MAX,

	.blocklen = SPDK_BS_PAGE_SIZE,

	.create_channel = NULL,

	.destroy_channel = NULL,

	.destroy = zeroes_destroy,

	.read = zeroes_read,

	.write = zeroes_write,

	.readv = zeroes_readv,

	.writev = zeroes_writev,

	.write_zeroes = zeroes_write_zeroes,

	.unmap = zeroes_unmap,

};



struct spdk_bs_dev *

spdk_bs_create_zeroes_dev(void)

{

	return &g_zeroes_bs_dev;

}