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block migration: Consolidate mig_read_device_bulk into mig_save_device_bulk 

Both functions share a lot of code, so make them one.

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 18:21:20 +01:00 committed by Anthony Liguori
parent b1d10856d6
commit 57cce12d54
1 changed files with 60 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

169
block-migration.c
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@ -85,96 +85,25 @@ static void blk_mig_read_cb(void *opaque, int ret)
assert(block_mig_state.submitted >= 0);
}
static int mig_read_device_bulk(QEMUFile *f, BlkMigDevState *bms)
static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds, int is_async)
{
int nr_sectors;
int64_t total_sectors, cur_sector = 0;
BlockDriverState *bs = bms->bs;
BlkMigBlock *blk;
blk = qemu_malloc(sizeof(BlkMigBlock));
blk->buf = qemu_malloc(BLOCK_SIZE);
cur_sector = bms->cur_sector;
total_sectors = bms->total_sectors;
if (bms->shared_base) {
while (cur_sector < total_sectors &&
!bdrv_is_allocated(bms->bs, cur_sector,
MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
cur_sector += nr_sectors;
}
}
if (cur_sector >= total_sectors) {
bms->cur_sector = total_sectors;
qemu_free(blk->buf);
qemu_free(blk);
return 1;
}
if (cur_sector >= block_mig_state.print_completion) {
printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors);
fflush(stdout);
block_mig_state.print_completion +=
(BDRV_SECTORS_PER_DIRTY_CHUNK * 10000);
}
/* we are going to transfer a full block even if it is not allocated */
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
cur_sector &= ~((int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK - 1);
if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = (total_sectors - cur_sector);
}
bms->cur_sector = cur_sector + nr_sectors;
blk->sector = cur_sector;
blk->bmds = bms;
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(bms->bs, cur_sector, nr_sectors);
block_mig_state.submitted++;
return (bms->cur_sector >= total_sectors);
}
static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
{
int len, nr_sectors;
int64_t total_sectors = bmds->total_sectors, cur_sector = 0;
uint8_t *tmp_buf = NULL;
int64_t total_sectors = bmds->total_sectors;
int64_t cur_sector = bmds->cur_sector;
BlockDriverState *bs = bmds->bs;
tmp_buf = qemu_malloc(BLOCK_SIZE);
cur_sector = bmds->cur_sector;
int len, nr_sectors;
BlkMigBlock *blk;
uint8_t *tmp_buf;
if (bmds->shared_base) {
while (cur_sector < total_sectors &&
!bdrv_is_allocated(bmds->bs, cur_sector,
MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
!bdrv_is_allocated(bs, cur_sector, MAX_IS_ALLOCATED_SEARCH,
&nr_sectors)) {
cur_sector += nr_sectors;
}
}
if (cur_sector >= total_sectors) {
bmds->cur_sector = total_sectors;
qemu_free(tmp_buf);
return 1;
}
@ -191,30 +120,59 @@ static int mig_save_device_bulk(QEMUFile *f, BlkMigDevState *bmds)
nr_sectors = BDRV_SECTORS_PER_DIRTY_CHUNK;
if (total_sectors - cur_sector < BDRV_SECTORS_PER_DIRTY_CHUNK) {
nr_sectors = (total_sectors - cur_sector);
nr_sectors = total_sectors - cur_sector;
}
if (bdrv_read(bs, cur_sector, tmp_buf, nr_sectors) < 0) {
printf("Error reading sector %" PRId64 "\n", 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->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) {
printf("Error reading sector %" PRId64 "\n", cur_sector);
}
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);
}
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);
return (bmds->cur_sector >= total_sectors);
}
@ -279,16 +237,9 @@ static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
QSIMPLEQ_FOREACH(bmds, &block_mig_state.bmds_list, entry) {
if (bmds->bulk_completed == 0) {
if (is_async) {
if (mig_read_device_bulk(f, bmds) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
} else {
if (mig_save_device_bulk(f, bmds) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
if (mig_save_device_bulk(f, bmds, is_async) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
return 1;
}