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blob: Add a bs_dev that always returns 0

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

Change-Id: I78cf8cda39e8dff42da69b79ed460797d7494af1
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/397043
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Ben Walker 2018-01-29 10:24:04 -07:00 committed by Jim Harris
parent dc82989dd2
commit 8970f8682a
3 changed files with 125 additions and 1 deletions
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2
lib/blob/Makefile
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@ -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

2
lib/blob/blobstore.h
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@ -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:

122
lib/blob/zeroes.c Normal file
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@ -0,0 +1,122 @@
/*-
* 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;
}