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block migration: Consolidate block transmission

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Based on the original patch by Pierre Riteau: Use a common blk_send
function to transmit a block.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Jan Kiszka 2009-11-30 18:21:21 +01:00 committed by Anthony Liguori
parent 57cce12d54
commit 13f0b67fd3
1 changed files with 39 additions and 65 deletions
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98
block-migration.c
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@ -72,6 +72,22 @@ typedef struct BlkMigState {
static BlkMigState block_mig_state;
static void blk_send(QEMUFile *f, BlkMigBlock * blk)
{
int len;
/* sector number and flags */
qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS)
| BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
len = strlen(blk->bmds->bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len);
qemu_put_buffer(f, blk->buf, BLOCK_SIZE);
}
static void blk_mig_read_cb(void *opaque, int ret)
{
BlkMigBlock *blk = opaque;
@ -90,9 +106,8 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds, int is_async)
int64_t total_sectors = bmds->total_sectors;
int64_t cur_sector = bmds->cur_sector;
BlockDriverState *bs = bmds->bs;
int len, nr_sectors;
BlkMigBlock *blk;
uint8_t *tmp_buf;
int nr_sectors;
if (bmds->shared_base) {
while (cur_sector < total_sectors &&
@ -123,75 +138,42 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds, int is_async)
nr_sectors = total_sectors - cur_sector;
}
if (is_async) {
blk = qemu_malloc(sizeof(BlkMigBlock));
blk->buf = qemu_malloc(BLOCK_SIZE);
bmds->cur_sector = cur_sector + nr_sectors;
blk->sector = cur_sector;
blk->bmds = bmds;
blk->sector = cur_sector;
if (is_async) {
blk->iov.iov_base = blk->buf;
blk->iov.iov_len = nr_sectors * BDRV_SECTOR_SIZE;
qemu_iovec_init_external(&blk->qiov, &blk->iov, 1);
blk->aiocb = bdrv_aio_readv(bs, cur_sector, &blk->qiov,
nr_sectors, blk_mig_read_cb, blk);
if (!blk->aiocb) {
printf("Error reading sector %" PRId64 "\n", cur_sector);
qemu_free(blk->buf);
qemu_free(blk);
return 0;
}
bdrv_reset_dirty(bs, cur_sector, nr_sectors);
block_mig_state.submitted++;
} else {
tmp_buf = qemu_malloc(BLOCK_SIZE);
if (bdrv_read(bs, cur_sector, tmp_buf, nr_sectors) < 0) {
if (bdrv_read(bs, cur_sector, blk->buf, nr_sectors) < 0) {
printf("Error reading sector %" PRId64 "\n", cur_sector);
return 0;
}
blk_send(f, blk);
qemu_free(blk->buf);
qemu_free(blk);
}
bdrv_reset_dirty(bs, cur_sector, nr_sectors);
/* sector number and flags */
qemu_put_be64(f, (cur_sector << BDRV_SECTOR_BITS)
| BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
len = strlen(bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)bs->device_name, len);
qemu_put_buffer(f, tmp_buf, BLOCK_SIZE);
bmds->cur_sector = cur_sector + BDRV_SECTORS_PER_DIRTY_CHUNK;
qemu_free(tmp_buf);
}
bmds->cur_sector = cur_sector + nr_sectors;
return (bmds->cur_sector >= total_sectors);
}
static void send_blk(QEMUFile *f, BlkMigBlock * blk)
{
int len;
/* sector number and flags */
qemu_put_be64(f, (blk->sector << BDRV_SECTOR_BITS)
| BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
len = strlen(blk->bmds->bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)blk->bmds->bs->device_name, len);
qemu_put_buffer(f, blk->buf, BLOCK_SIZE);
}
static void set_dirty_tracking(int enable)
{
BlkMigDevState *bmds;
@ -254,30 +236,22 @@ static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
static void blk_mig_save_dirty_blocks(QEMUFile *f)
{
BlkMigDevState *bmds;
uint8_t *buf;
BlkMigBlock blk;
int64_t sector;
int len;
buf = qemu_malloc(BLOCK_SIZE);
blk.buf = qemu_malloc(BLOCK_SIZE);
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
for (sector = 0; sector < bmds->cur_sector;) {
if (bdrv_get_dirty(bmds->bs, sector)) {
if (bdrv_read(bmds->bs, sector, buf,
if (bdrv_read(bmds->bs, sector, blk.buf,
BDRV_SECTORS_PER_DIRTY_CHUNK) < 0) {
printf("Error reading sector %" PRId64 "\n", sector);
/* FIXME: add error handling */
}
/* sector number and flags */
qemu_put_be64(f, (sector << BDRV_SECTOR_BITS)
| BLK_MIG_FLAG_DEVICE_BLOCK);
/* device name */
len = strlen(bmds->bs->device_name);
qemu_put_byte(f, len);
qemu_put_buffer(f, (uint8_t *)bmds->bs->device_name, len);
qemu_put_buffer(f, buf, BLOCK_SIZE);
blk.bmds = bmds;
blk.sector = sector;
blk_send(f, &blk);
bdrv_reset_dirty(bmds->bs, sector,
BDRV_SECTORS_PER_DIRTY_CHUNK);
@ -286,7 +260,7 @@ static void blk_mig_save_dirty_blocks(QEMUFile *f)
}
}
qemu_free(buf);
qemu_free(blk.buf);
}
static void flush_blks(QEMUFile* f)
@ -301,7 +275,7 @@ static void flush_blks(QEMUFile* f)
if (qemu_file_rate_limit(f)) {
break;
}
send_blk(f, blk);
blk_send(f, blk);
QSIMPLEQ_REMOVE_HEAD(&block_mig_state.blk_list, entry);
qemu_free(blk->buf);