c34d4d490d
A shallow copy will copy over the destination device only the cluster allocated to the blob/lvol discarding those belonging to the blob/lvol parent snapshot. blob/lvol must be read only. Signed-off-by: Damiano Cipriani <damiano.cipriani@suse.com>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (C) 2023 SUSE LLC.
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* All rights reserved.
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*/
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#include "thread/thread_internal.h"
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#include "spdk/blob.h"
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#define EXT_DEV_BUFFER_SIZE (4 * 1024 * 1024)
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uint8_t g_ext_dev_buffer[EXT_DEV_BUFFER_SIZE];
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struct spdk_io_channel g_ext_io_channel;
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static struct spdk_io_channel *
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ext_dev_create_channel(struct spdk_bs_dev *dev)
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{
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return &g_ext_io_channel;
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}
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static void
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ext_dev_destroy_channel(struct spdk_bs_dev *dev, struct spdk_io_channel *channel)
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{
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}
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static void
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ext_dev_destroy(struct spdk_bs_dev *dev)
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{
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free(dev);
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}
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static void
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ext_dev_read(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload,
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uint64_t lba, uint32_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args)
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{
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uint64_t offset, length;
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offset = lba * dev->blocklen;
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length = lba_count * dev->blocklen;
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SPDK_CU_ASSERT_FATAL(offset + length <= EXT_DEV_BUFFER_SIZE);
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if (length > 0) {
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memcpy(payload, &g_ext_dev_buffer[offset], length);
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}
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0);
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}
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static void
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ext_dev_write(struct spdk_bs_dev *dev, struct spdk_io_channel *channel, void *payload,
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uint64_t lba, uint32_t lba_count,
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struct spdk_bs_dev_cb_args *cb_args)
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{
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uint64_t offset, length;
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offset = lba * dev->blocklen;
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length = lba_count * dev->blocklen;
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SPDK_CU_ASSERT_FATAL(offset + length <= EXT_DEV_BUFFER_SIZE);
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memcpy(&g_ext_dev_buffer[offset], payload, length);
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cb_args->cb_fn(cb_args->channel, cb_args->cb_arg, 0);
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}
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static struct spdk_bs_dev *
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init_ext_dev(uint64_t blockcnt, uint32_t blocklen)
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{
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struct spdk_bs_dev *dev = calloc(1, sizeof(*dev));
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SPDK_CU_ASSERT_FATAL(dev != NULL);
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dev->create_channel = ext_dev_create_channel;
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dev->destroy_channel = ext_dev_destroy_channel;
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dev->destroy = ext_dev_destroy;
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dev->read = ext_dev_read;
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dev->write = ext_dev_write;
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dev->blockcnt = blockcnt;
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dev->blocklen = blocklen;
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return dev;
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}
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