*
*/
+#include "qemu/osdep.h"
+#include "qapi/error.h"
#include "qemu-common.h"
#include "block/block_int.h"
+#include "sysemu/block-backend.h"
#include "qemu/module.h"
#include "qemu/crc32c.h"
+#include "qemu/bswap.h"
#include "block/vhdx.h"
#include "migration/migration.h"
#include <uuid/uuid.h>
-#include <glib.h>
/* Options for VHDX creation */
static void vhdx_set_shift_bits(BDRVVHDXState *s)
{
- s->logical_sector_size_bits = 31 - clz32(s->logical_sector_size);
- s->sectors_per_block_bits = 31 - clz32(s->sectors_per_block);
- s->chunk_ratio_bits = 63 - clz64(s->chunk_ratio);
- s->block_size_bits = 31 - clz32(s->block_size);
+ s->logical_sector_size_bits = ctz32(s->logical_sector_size);
+ s->sectors_per_block_bits = ctz32(s->sectors_per_block);
+ s->chunk_ratio_bits = ctz64(s->chunk_ratio);
+ s->block_size_bits = ctz32(s->block_size);
}
/*
* and then update the header checksum. Header is converted to proper
* endianness before being written to the specified file offset
*/
-static int vhdx_write_header(BlockDriverState *bs_file, VHDXHeader *hdr,
+static int vhdx_write_header(BdrvChild *file, VHDXHeader *hdr,
uint64_t offset, bool read)
{
+ BlockDriverState *bs_file = file->bs;
uint8_t *buffer = NULL;
int ret;
VHDXHeader *header_le;
buffer = qemu_blockalign(bs_file, VHDX_HEADER_SIZE);
if (read) {
/* if true, we can't assume the extra reserved bytes are 0 */
- ret = bdrv_pread(bs_file, offset, buffer, VHDX_HEADER_SIZE);
+ ret = bdrv_pread(file, offset, buffer, VHDX_HEADER_SIZE);
if (ret < 0) {
goto exit;
}
vhdx_header_le_export(hdr, header_le);
vhdx_update_checksum(buffer, VHDX_HEADER_SIZE,
offsetof(VHDXHeader, checksum));
- ret = bdrv_pwrite_sync(bs_file, offset, header_le, sizeof(VHDXHeader));
+ ret = bdrv_pwrite_sync(file, offset, header_le, sizeof(VHDXHeader));
exit:
qemu_vfree(buffer);
/* We have to read the whole VHDX_HEADER_SIZE instead of
* sizeof(VHDXHeader), because the checksum is over the whole
* region */
- ret = bdrv_pread(bs->file, VHDX_HEADER1_OFFSET, buffer, VHDX_HEADER_SIZE);
+ ret = bdrv_pread(bs->file, VHDX_HEADER1_OFFSET, buffer,
+ VHDX_HEADER_SIZE);
if (ret < 0) {
goto fail;
}
}
}
- ret = bdrv_pread(bs->file, VHDX_HEADER2_OFFSET, buffer, VHDX_HEADER_SIZE);
+ ret = bdrv_pread(bs->file, VHDX_HEADER2_OFFSET, buffer,
+ VHDX_HEADER_SIZE);
if (ret < 0) {
goto fail;
}
{
uint32_t data_blocks_cnt, bitmap_blocks_cnt;
- data_blocks_cnt = s->virtual_disk_size >> s->block_size_bits;
- if (s->virtual_disk_size - (data_blocks_cnt << s->block_size_bits)) {
- data_blocks_cnt++;
- }
- bitmap_blocks_cnt = data_blocks_cnt >> s->chunk_ratio_bits;
- if (data_blocks_cnt - (bitmap_blocks_cnt << s->chunk_ratio_bits)) {
- bitmap_blocks_cnt++;
- }
+ data_blocks_cnt = DIV_ROUND_UP(s->virtual_disk_size, s->block_size);
+ bitmap_blocks_cnt = DIV_ROUND_UP(data_blocks_cnt, s->chunk_ratio);
if (s->parent_entries) {
s->bat_entries = bitmap_blocks_cnt * (s->chunk_ratio + 1);
}
/* s->bat is freed in vhdx_close() */
- s->bat = qemu_try_blockalign(bs->file, s->bat_rt.length);
+ s->bat = qemu_try_blockalign(bs->file->bs, s->bat_rt.length);
if (s->bat == NULL) {
ret = -ENOMEM;
goto fail;
static int vhdx_allocate_block(BlockDriverState *bs, BDRVVHDXState *s,
uint64_t *new_offset)
{
- *new_offset = bdrv_getlength(bs->file);
+ *new_offset = bdrv_getlength(bs->file->bs);
/* per the spec, the address for a block is in units of 1MB */
*new_offset = ROUND_UP(*new_offset, 1024 * 1024);
- return bdrv_truncate(bs->file, *new_offset + s->block_size);
+ return bdrv_truncate(bs->file->bs, *new_offset + s->block_size);
}
/*
/* Queue another write of zero buffers if the underlying file
* does not zero-fill on file extension */
- if (bdrv_has_zero_init(bs->file) == 0) {
+ if (bdrv_has_zero_init(bs->file->bs) == 0) {
use_zero_buffers = true;
/* zero fill the front, if any */
* There are 2 headers, and the highest sequence number will represent
* the active header
*/
-static int vhdx_create_new_headers(BlockDriverState *bs, uint64_t image_size,
+static int vhdx_create_new_headers(BlockBackend *blk, uint64_t image_size,
uint32_t log_size)
{
+ BlockDriverState *bs = blk_bs(blk);
+ BdrvChild *child;
int ret = 0;
VHDXHeader *hdr = NULL;
vhdx_guid_generate(&hdr->file_write_guid);
vhdx_guid_generate(&hdr->data_write_guid);
- ret = vhdx_write_header(bs, hdr, VHDX_HEADER1_OFFSET, false);
+ /* XXX Ugly way to get blk->root, but that's a feature, not a bug. This
+ * hack makes it obvious that vhdx_write_header() bypasses the BlockBackend
+ * here, which it really shouldn't be doing. */
+ child = QLIST_FIRST(&bs->parents);
+ assert(!QLIST_NEXT(child, next_parent));
+
+ ret = vhdx_write_header(child, hdr, VHDX_HEADER1_OFFSET, false);
if (ret < 0) {
goto exit;
}
hdr->sequence_number++;
- ret = vhdx_write_header(bs, hdr, VHDX_HEADER2_OFFSET, false);
+ ret = vhdx_write_header(child, hdr, VHDX_HEADER2_OFFSET, false);
if (ret < 0) {
goto exit;
}
* The first 64KB of the Metadata section is reserved for the metadata
* header and entries; beyond that, the metadata items themselves reside.
*/
-static int vhdx_create_new_metadata(BlockDriverState *bs,
+static int vhdx_create_new_metadata(BlockBackend *blk,
uint64_t image_size,
uint32_t block_size,
uint32_t sector_size,
VHDX_META_FLAGS_IS_VIRTUAL_DISK;
vhdx_metadata_entry_le_export(&md_table_entry[4]);
- ret = bdrv_pwrite(bs, metadata_offset, buffer, VHDX_HEADER_BLOCK_SIZE);
+ ret = blk_pwrite(blk, metadata_offset, buffer, VHDX_HEADER_BLOCK_SIZE, 0);
if (ret < 0) {
goto exit;
}
- ret = bdrv_pwrite(bs, metadata_offset + (64 * KiB), entry_buffer,
- VHDX_METADATA_ENTRY_BUFFER_SIZE);
+ ret = blk_pwrite(blk, metadata_offset + (64 * KiB), entry_buffer,
+ VHDX_METADATA_ENTRY_BUFFER_SIZE, 0);
if (ret < 0) {
goto exit;
}
* Fixed images: default state of the BAT is fully populated, with
* file offsets and state PAYLOAD_BLOCK_FULLY_PRESENT.
*/
-static int vhdx_create_bat(BlockDriverState *bs, BDRVVHDXState *s,
+static int vhdx_create_bat(BlockBackend *blk, BDRVVHDXState *s,
uint64_t image_size, VHDXImageType type,
bool use_zero_blocks, uint64_t file_offset,
uint32_t length)
if (type == VHDX_TYPE_DYNAMIC) {
/* All zeroes, so we can just extend the file - the end of the BAT
* is the furthest thing we have written yet */
- ret = bdrv_truncate(bs, data_file_offset);
+ ret = blk_truncate(blk, data_file_offset);
if (ret < 0) {
goto exit;
}
} else if (type == VHDX_TYPE_FIXED) {
- ret = bdrv_truncate(bs, data_file_offset + image_size);
+ ret = blk_truncate(blk, data_file_offset + image_size);
if (ret < 0) {
goto exit;
}
if (type == VHDX_TYPE_FIXED ||
use_zero_blocks ||
- bdrv_has_zero_init(bs) == 0) {
+ bdrv_has_zero_init(blk_bs(blk)) == 0) {
/* for a fixed file, the default BAT entry is not zero */
s->bat = g_try_malloc0(length);
if (length && s->bat == NULL) {
sinfo.file_offset = data_file_offset +
(sector_num << s->logical_sector_size_bits);
sinfo.file_offset = ROUND_UP(sinfo.file_offset, MiB);
- vhdx_update_bat_table_entry(bs, s, &sinfo, &unused, &unused,
+ vhdx_update_bat_table_entry(blk_bs(blk), s, &sinfo, &unused, &unused,
block_state);
cpu_to_le64s(&s->bat[sinfo.bat_idx]);
sector_num += s->sectors_per_block;
}
- ret = bdrv_pwrite(bs, file_offset, s->bat, length);
+ ret = blk_pwrite(blk, file_offset, s->bat, length, 0);
if (ret < 0) {
goto exit;
}
* to create the BAT itself, we will also cause the BAT to be
* created.
*/
-static int vhdx_create_new_region_table(BlockDriverState *bs,
+static int vhdx_create_new_region_table(BlockBackend *blk,
uint64_t image_size,
uint32_t block_size,
uint32_t sector_size,
/* The region table gives us the data we need to create the BAT,
* so do that now */
- ret = vhdx_create_bat(bs, s, image_size, type, use_zero_blocks,
+ ret = vhdx_create_bat(blk, s, image_size, type, use_zero_blocks,
bat_file_offset, bat_length);
if (ret < 0) {
goto exit;
}
/* Now write out the region headers to disk */
- ret = bdrv_pwrite(bs, VHDX_REGION_TABLE_OFFSET, buffer,
- VHDX_HEADER_BLOCK_SIZE);
+ ret = blk_pwrite(blk, VHDX_REGION_TABLE_OFFSET, buffer,
+ VHDX_HEADER_BLOCK_SIZE, 0);
if (ret < 0) {
goto exit;
}
- ret = bdrv_pwrite(bs, VHDX_REGION_TABLE2_OFFSET, buffer,
- VHDX_HEADER_BLOCK_SIZE);
+ ret = blk_pwrite(blk, VHDX_REGION_TABLE2_OFFSET, buffer,
+ VHDX_HEADER_BLOCK_SIZE, 0);
if (ret < 0) {
goto exit;
}
gunichar2 *creator = NULL;
glong creator_items;
- BlockDriverState *bs;
+ BlockBackend *blk;
char *type = NULL;
VHDXImageType image_type;
Error *local_err = NULL;
goto exit;
}
- bs = NULL;
- ret = bdrv_open(&bs, filename, NULL, NULL, BDRV_O_RDWR | BDRV_O_PROTOCOL,
- &local_err);
- if (ret < 0) {
+ blk = blk_new_open(filename, NULL, NULL,
+ BDRV_O_RDWR | BDRV_O_PROTOCOL, &local_err);
+ if (blk == NULL) {
error_propagate(errp, local_err);
+ ret = -EIO;
goto exit;
}
+ blk_set_allow_write_beyond_eof(blk, true);
+
/* Create (A) */
/* The creator field is optional, but may be useful for
creator = g_utf8_to_utf16("QEMU v" QEMU_VERSION, -1, NULL,
&creator_items, NULL);
signature = cpu_to_le64(VHDX_FILE_SIGNATURE);
- ret = bdrv_pwrite(bs, VHDX_FILE_ID_OFFSET, &signature, sizeof(signature));
+ ret = blk_pwrite(blk, VHDX_FILE_ID_OFFSET, &signature, sizeof(signature),
+ 0);
if (ret < 0) {
goto delete_and_exit;
}
if (creator) {
- ret = bdrv_pwrite(bs, VHDX_FILE_ID_OFFSET + sizeof(signature),
- creator, creator_items * sizeof(gunichar2));
+ ret = blk_pwrite(blk, VHDX_FILE_ID_OFFSET + sizeof(signature),
+ creator, creator_items * sizeof(gunichar2), 0);
if (ret < 0) {
goto delete_and_exit;
}
/* Creates (B),(C) */
- ret = vhdx_create_new_headers(bs, image_size, log_size);
+ ret = vhdx_create_new_headers(blk, image_size, log_size);
if (ret < 0) {
goto delete_and_exit;
}
/* Creates (D),(E),(G) explicitly. (F) created as by-product */
- ret = vhdx_create_new_region_table(bs, image_size, block_size, 512,
+ ret = vhdx_create_new_region_table(blk, image_size, block_size, 512,
log_size, use_zero_blocks, image_type,
&metadata_offset);
if (ret < 0) {
}
/* Creates (H) */
- ret = vhdx_create_new_metadata(bs, image_size, block_size, 512,
+ ret = vhdx_create_new_metadata(blk, image_size, block_size, 512,
metadata_offset, image_type);
if (ret < 0) {
goto delete_and_exit;
delete_and_exit:
- bdrv_unref(bs);
+ blk_unref(blk);
exit:
g_free(type);
g_free(creator);
projects / mirror_qemu.git / blobdiff