/*
* Copyright (c) 2024 Jiri Svoboda
* Copyright (c) 2012 Sean Bartell
* 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.
*/
/** @addtogroup bithenge
* @{
*/
/**
* @file
* Access block devices as blobs.
* @todo Provide more information about the block device (block size).
*/
#include <assert.h>
#include <block.h>
#include <errno.h>
#include <loc.h>
#include <macros.h>
#include <stdlib.h>
#include <bithenge/blob.h>
#include "block.h"
typedef struct {
bithenge_blob_t base;
service_id_t service_id;
aoff64_t size;
} block_blob_t;
static inline block_blob_t *blob_as_block(bithenge_blob_t *base)
{
return (block_blob_t *)base;
}
static inline bithenge_blob_t *block_as_blob(block_blob_t *blob)
{
return &blob->base;
}
static errno_t block_size(bithenge_blob_t *base, aoff64_t *size)
{
block_blob_t *self = blob_as_block(base);
*size = self->size;
return EOK;
}
static errno_t block_read(bithenge_blob_t *base, aoff64_t offset, char *buffer,
aoff64_t *size)
{
block_blob_t *self = blob_as_block(base);
if (offset > self->size)
return ELIMIT;
*size = min(*size, self->size - offset);
return block_read_bytes_direct(self->service_id, offset, *size, buffer);
}
static void block_destroy(bithenge_blob_t *base)
{
block_blob_t *self = blob_as_block(base);
block_fini(self->service_id);
free(self);
}
static const bithenge_random_access_blob_ops_t block_ops = {
.size = block_size,
.read = block_read,
.destroy = block_destroy,
};
/** Create a blob for a block device. The blob must be freed with
* @a bithenge_node_t::bithenge_node_destroy after it is used.
* @param[out] out Stores the created blob.
* @param service_id The service ID of the block device.
* @return EOK on success or an error code from errno.h.
*/
errno_t bithenge_new_block_blob(bithenge_node_t **out, service_id_t service_id)
{
assert(out);
// Initialize libblock
errno_t rc;
rc = block_init(service_id);
if (rc != EOK)
return rc;
// Calculate total device size
size_t bsize;
aoff64_t nblocks;
aoff64_t size;
rc = block_get_bsize(service_id, &bsize);
if (rc != EOK) {
block_fini(service_id);
return rc;
}
rc = block_get_nblocks(service_id, &nblocks);
if (rc != EOK) {
block_fini(service_id);
return rc;
}
size = bsize * nblocks;
// Create blob
block_blob_t *blob = malloc(sizeof(*blob));
if (!blob) {
block_fini(service_id);
return ENOMEM;
}
rc = bithenge_init_random_access_blob(block_as_blob(blob),
&block_ops);
if (rc != EOK) {
free(blob);
block_fini(service_id);
return rc;
}
blob->service_id = service_id;
blob->size = size;
*out = bithenge_blob_as_node(block_as_blob(blob));
return EOK;
}
/** @}
*/