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Diffstat (limited to 'block-migration.c')
-rw-r--r--block-migration.c390
1 files changed, 184 insertions, 206 deletions
diff --git a/block-migration.c b/block-migration.c
index 09771eded2..37e41abe27 100644
--- a/block-migration.c
+++ b/block-migration.c
@@ -21,7 +21,7 @@
#define SECTOR_SIZE (1 << SECTOR_BITS)
#define SECTOR_MASK ~(SECTOR_SIZE - 1);
-#define BLOCK_SIZE (block_mig_state->sectors_per_block << SECTOR_BITS)
+#define BLOCK_SIZE (block_mig_state->sectors_per_block << SECTOR_BITS)
#define BLK_MIG_FLAG_DEVICE_BLOCK 0x01
#define BLK_MIG_FLAG_EOS 0x02
@@ -34,13 +34,23 @@
//#define DEBUG_BLK_MIGRATION
#ifdef DEBUG_BLK_MIGRATION
-#define dprintf(fmt, ...) \
+#define dprintf(fmt, ...) \
do { printf("blk_migration: " fmt, ## __VA_ARGS__); } while (0)
#else
-#define dprintf(fmt, ...) \
+#define dprintf(fmt, ...) \
do { } while (0)
#endif
+typedef struct BlkMigDevState {
+ BlockDriverState *bs;
+ int bulk_completed;
+ int shared_base;
+ struct BlkMigDevState *next;
+ int64_t cur_sector;
+ int64_t total_sectors;
+ int64_t dirty;
+} BlkMigDevState;
+
typedef struct BlkMigBlock {
uint8_t *buf;
BlkMigDevState *bmds;
@@ -68,87 +78,85 @@ typedef struct BlkMigState {
int64_t print_completion;
} BlkMigState;
-static BlkMigState *block_mig_state = NULL;
+static BlkMigState *block_mig_state = NULL;
static void blk_mig_read_cb(void *opaque, int ret)
{
BlkMigBlock *blk = opaque;
-
+
blk->ret = ret;
-
+
/* insert at the end */
- if(block_mig_state->last_blk == NULL) {
+ if (block_mig_state->last_blk == NULL) {
block_mig_state->first_blk = blk;
block_mig_state->last_blk = blk;
} else {
block_mig_state->last_blk->next = blk;
block_mig_state->last_blk = blk;
}
-
+
block_mig_state->submitted--;
block_mig_state->read_done++;
assert(block_mig_state->submitted >= 0);
-
- return;
}
static int mig_read_device_bulk(QEMUFile *f, BlkMigDevState *bms)
-{
+{
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 = bdrv_getlength(bs) >> SECTOR_BITS;
-
- if(bms->shared_base) {
- while(cur_sector < bms->total_sectors &&
- !bdrv_is_allocated(bms->bs, cur_sector,
- MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
+
+ if (bms->shared_base) {
+ while (cur_sector < bms->total_sectors &&
+ !bdrv_is_allocated(bms->bs, cur_sector,
+ MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
cur_sector += nr_sectors;
}
}
-
- if(cur_sector >= total_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) {
+
+ if (cur_sector >= block_mig_state->print_completion) {
printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors);
fflush(stdout);
- block_mig_state->print_completion +=
+ block_mig_state->print_completion +=
(block_mig_state->sectors_per_block * 10000);
}
-
+
/* we going to transfder BLOCK_SIZE any way even if it is not allocated */
nr_sectors = block_mig_state->sectors_per_block;
cur_sector &= ~((int64_t)block_mig_state->sectors_per_block -1);
-
- if(total_sectors - cur_sector < block_mig_state->sectors_per_block) {
+
+ if (total_sectors - cur_sector < block_mig_state->sectors_per_block) {
nr_sectors = (total_sectors - cur_sector);
}
-
+
bms->cur_sector = cur_sector + nr_sectors;
blk->sector = cur_sector;
blk->bmds = bms;
blk->next = NULL;
-
+
blk->iov.iov_base = blk->buf;
blk->iov.iov_len = nr_sectors * 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) {
+
+ if (!blk->aiocb) {
printf("Error reading sector %" PRId64 "\n", cur_sector);
qemu_free(blk->buf);
qemu_free(blk);
@@ -157,91 +165,87 @@ static int mig_read_device_bulk(QEMUFile *f, BlkMigDevState *bms)
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;
BlockDriverState *bs = bmds->bs;
tmp_buf = qemu_malloc(BLOCK_SIZE);
-
+
cur_sector = bmds->cur_sector;
-
- if(bmds->shared_base) {
- while(cur_sector < bmds->total_sectors &&
- !bdrv_is_allocated(bmds->bs, cur_sector,
- MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
+
+ if (bmds->shared_base) {
+ while (cur_sector < bmds->total_sectors &&
+ !bdrv_is_allocated(bmds->bs, cur_sector,
+ MAX_IS_ALLOCATED_SEARCH, &nr_sectors)) {
cur_sector += nr_sectors;
}
}
-
- if(cur_sector >= total_sectors) {
+
+ if (cur_sector >= total_sectors) {
bmds->cur_sector = total_sectors;
qemu_free(tmp_buf);
return 1;
}
-
- if(cur_sector >= block_mig_state->print_completion) {
+
+ if (cur_sector >= block_mig_state->print_completion) {
printf("Completed %" PRId64 " %%\r", cur_sector * 100 / total_sectors);
fflush(stdout);
- block_mig_state->print_completion +=
+ block_mig_state->print_completion +=
(block_mig_state->sectors_per_block * 10000);
}
-
+
cur_sector &= ~((int64_t)block_mig_state->sectors_per_block -1);
-
- /* we going to transfer
- BLOCK_SIZE
- any way even if it is not allocated */
+
+ /* we going to transfer BLOCK_SIZE any way even if it is not allocated */
nr_sectors = block_mig_state->sectors_per_block;
-
- if(total_sectors - cur_sector < block_mig_state->sectors_per_block) {
+
+ if (total_sectors - cur_sector < block_mig_state->sectors_per_block) {
nr_sectors = (total_sectors - cur_sector);
}
-
- if(bdrv_read(bs, cur_sector, tmp_buf, nr_sectors) < 0) {
+
+ 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);
-
- /* Device name */
- qemu_put_be64(f,(cur_sector << SECTOR_BITS) | BLK_MIG_FLAG_DEVICE_BLOCK);
-
+
+ /* sector number and flags */
+ qemu_put_be64(f, (cur_sector << 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);
-
+
+ qemu_put_buffer(f, tmp_buf, BLOCK_SIZE);
+
bmds->cur_sector = cur_sector + block_mig_state->sectors_per_block;
-
+
qemu_free(tmp_buf);
-
+
return (bmds->cur_sector >= total_sectors);
}
static void send_blk(QEMUFile *f, BlkMigBlock * blk)
{
int len;
-
- /* Device name */
- qemu_put_be64(f,(blk->sector << SECTOR_BITS) | BLK_MIG_FLAG_DEVICE_BLOCK);
-
+
+ /* sector number and flags */
+ qemu_put_be64(f, (blk->sector << 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);
-
- return;
+
+ qemu_put_buffer(f, blk->buf, BLOCK_SIZE);
}
static void blk_mig_save_dev_info(QEMUFile *f, BlkMigDevState *bmds)
@@ -251,47 +255,43 @@ static void blk_mig_save_dev_info(QEMUFile *f, BlkMigDevState *bmds)
static void set_dirty_tracking(int enable)
{
BlkMigDevState *bmds;
- for(bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
- bdrv_set_dirty_tracking(bmds->bs,enable);
+ for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
+ bdrv_set_dirty_tracking(bmds->bs, enable);
}
-
- return;
}
static void init_blk_migration(QEMUFile *f)
{
BlkMigDevState **pbmds, *bmds;
BlockDriverState *bs;
-
+
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
- if(bs->type == BDRV_TYPE_HD) {
+ if (bs->type == BDRV_TYPE_HD) {
bmds = qemu_mallocz(sizeof(BlkMigDevState));
bmds->bs = bs;
bmds->bulk_completed = 0;
bmds->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
bmds->shared_base = block_mig_state->shared_base;
-
- if(bmds->shared_base) {
- printf("Start migration for %s with shared base image\n",
+
+ if (bmds->shared_base) {
+ printf("Start migration for %s with shared base image\n",
bs->device_name);
} else {
printf("Start full migration for %s\n", bs->device_name);
}
-
+
/* insert at the end */
pbmds = &block_mig_state->bmds_first;
- while (*pbmds != NULL)
+ while (*pbmds != NULL) {
pbmds = &(*pbmds)->next;
+ }
*pbmds = bmds;
-
+
blk_mig_save_dev_info(f, bmds);
-
}
- }
-
+ }
+
block_mig_state->sectors_per_block = bdrv_get_sectors_per_chunk();
-
- return;
}
static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
@@ -299,14 +299,14 @@ static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
BlkMigDevState *bmds;
for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
- if(bmds->bulk_completed == 0) {
- if(is_async) {
- if(mig_read_device_bulk(f, bmds) == 1) {
+ 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) {
+ if (mig_save_device_bulk(f, bmds) == 1) {
/* completed bulk section for this device */
bmds->bulk_completed = 1;
}
@@ -314,12 +314,11 @@ static int blk_mig_save_bulked_block(QEMUFile *f, int is_async)
return 1;
}
}
-
+
/* we reached here means bulk is completed */
block_mig_state->bulk_completed = 1;
-
+
return 0;
-
}
#define MAX_NUM_BLOCKS 4
@@ -330,143 +329,131 @@ static void blk_mig_save_dirty_blocks(QEMUFile *f)
uint8_t buf[BLOCK_SIZE];
int64_t sector;
int len;
-
- for(bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
- for(sector = 0; sector < bmds->cur_sector;) {
-
- if(bdrv_get_dirty(bmds->bs,sector)) {
-
- if(bdrv_read(bmds->bs, sector, buf,
- block_mig_state->sectors_per_block) < 0) {
+
+ for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
+ for (sector = 0; sector < bmds->cur_sector;) {
+ if (bdrv_get_dirty(bmds->bs, sector)) {
+ if (bdrv_read(bmds->bs, sector, buf,
+ block_mig_state->sectors_per_block) < 0) {
+ /* FIXME: add error handling */
}
-
+
+ /* sector number and flags */
+ qemu_put_be64(f, (sector << SECTOR_BITS)
+ | BLK_MIG_FLAG_DEVICE_BLOCK);
+
/* device name */
- qemu_put_be64(f,(sector << SECTOR_BITS)
- | BLK_MIG_FLAG_DEVICE_BLOCK);
-
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_mig_state->sectors_per_block *
+
+ qemu_put_buffer(f, buf,
+ (block_mig_state->sectors_per_block *
SECTOR_SIZE));
-
- bdrv_reset_dirty(bmds->bs, sector,
+
+ bdrv_reset_dirty(bmds->bs, sector,
block_mig_state->sectors_per_block);
-
- sector += block_mig_state->sectors_per_block;
- } else {
- /* sector is clean */
- sector += block_mig_state->sectors_per_block;
- }
+ }
+ sector += block_mig_state->sectors_per_block;
}
}
-
- return;
}
static void flush_blks(QEMUFile* f)
{
- BlkMigBlock *blk, *tmp;
-
- dprintf("%s Enter submitted %d read_done %d transfered\n", __FUNCTION__,
+ BlkMigBlock *blk, *next;
+
+ dprintf("%s Enter submitted %d read_done %d transfered\n", __FUNCTION__,
submitted, read_done, transfered);
-
- for(blk = block_mig_state->first_blk;
- blk != NULL && !qemu_file_rate_limit(f); blk = tmp) {
+
+ for (blk = block_mig_state->first_blk;
+ blk != NULL && !qemu_file_rate_limit(f);
+ blk = next) {
send_blk(f, blk);
-
- tmp = blk->next;
+
+ next = blk->next;
qemu_free(blk->buf);
qemu_free(blk);
-
+
block_mig_state->read_done--;
block_mig_state->transferred++;
assert(block_mig_state->read_done >= 0);
}
block_mig_state->first_blk = blk;
-
- if(block_mig_state->first_blk == NULL) {
+
+ if (block_mig_state->first_blk == NULL) {
block_mig_state->last_blk = NULL;
}
- dprintf("%s Exit submitted %d read_done %d transferred%d\n", __FUNCTION__,
- block_mig_state->submitted, block_mig_state->read_done,
+ dprintf("%s Exit submitted %d read_done %d transferred%d\n", __FUNCTION__,
+ block_mig_state->submitted, block_mig_state->read_done,
block_mig_state->transferred);
-
- return;
}
static int is_stage2_completed(void)
{
BlkMigDevState *bmds;
-
- if(block_mig_state->submitted > 0) {
+
+ if (block_mig_state->submitted > 0) {
return 0;
}
-
+
for (bmds = block_mig_state->bmds_first; bmds != NULL; bmds = bmds->next) {
- if(bmds->bulk_completed == 0) {
+ if (bmds->bulk_completed == 0) {
return 0;
}
}
-
+
return 1;
}
static int block_save_live(QEMUFile *f, int stage, void *opaque)
{
- int ret = 1;
-
- dprintf("Enter save live stage %d submitted %d transferred %d\n", stage,
+ dprintf("Enter save live stage %d submitted %d transferred %d\n", stage,
submitted, transferred);
-
- if(block_mig_state->blk_enable != 1) {
+
+ if (block_mig_state->blk_enable != 1) {
/* no need to migrate storage */
-
- qemu_put_be64(f,BLK_MIG_FLAG_EOS);
+ qemu_put_be64(f, BLK_MIG_FLAG_EOS);
return 1;
}
-
- if(stage == 1) {
+
+ if (stage == 1) {
init_blk_migration(f);
-
+
/* start track dirty blocks */
set_dirty_tracking(1);
-
}
flush_blks(f);
-
+
/* control the rate of transfer */
- while ((block_mig_state->submitted + block_mig_state->read_done) *
- (BLOCK_SIZE) <
- (qemu_file_get_rate_limit(f))) {
-
- ret = blk_mig_save_bulked_block(f, 1);
-
- if (ret == 0) /* no more bulk blocks for now*/
+ while ((block_mig_state->submitted +
+ block_mig_state->read_done) * BLOCK_SIZE <
+ qemu_file_get_rate_limit(f)) {
+ if (blk_mig_save_bulked_block(f, 1) == 0) {
+ /* no more bulk blocks for now */
break;
+ }
}
-
+
flush_blks(f);
-
- if(stage == 3) {
-
- while(blk_mig_save_bulked_block(f, 0) != 0);
-
+
+ if (stage == 3) {
+ while (blk_mig_save_bulked_block(f, 0) != 0) {
+ /* empty */
+ }
+
blk_mig_save_dirty_blocks(f);
-
+
/* stop track dirty blocks */
- set_dirty_tracking(0);;
-
- printf("\nBlock migration completed\n");
+ set_dirty_tracking(0);
+
+ printf("\nBlock migration completed\n");
}
-
- qemu_put_be64(f,BLK_MIG_FLAG_EOS);
-
+
+ qemu_put_be64(f, BLK_MIG_FLAG_EOS);
+
return ((stage == 2) && is_stage2_completed());
}
@@ -477,43 +464,39 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
int64_t addr;
BlockDriverState *bs;
uint8_t *buf;
-
+
block_mig_state->sectors_per_block = bdrv_get_sectors_per_chunk();
buf = qemu_malloc(BLOCK_SIZE);
-
+
do {
-
addr = qemu_get_be64(f);
-
+
flags = addr & ~SECTOR_MASK;
addr &= SECTOR_MASK;
-
- if(flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
-
+
+ if (flags & BLK_MIG_FLAG_DEVICE_BLOCK) {
/* get device name */
len = qemu_get_byte(f);
-
+
qemu_get_buffer(f, (uint8_t *)device_name, len);
device_name[len] = '\0';
-
+
bs = bdrv_find(device_name);
-
- qemu_get_buffer(f, buf,
- BLOCK_SIZE);
- if(bs != NULL) {
-
- bdrv_write(bs, (addr >> SECTOR_BITS),
+
+ qemu_get_buffer(f, buf, BLOCK_SIZE);
+ if (bs != NULL) {
+ bdrv_write(bs, (addr >> SECTOR_BITS),
buf, block_mig_state->sectors_per_block);
} else {
printf("Error unknown block device %s\n", device_name);
+ /* FIXME: add error handling */
}
- } else if(flags & BLK_MIG_FLAG_EOS) {
-
- } else {
+ } else if (!(flags & BLK_MIG_FLAG_EOS)) {
printf("Unknown flags\n");
+ /* FIXME: add error handling */
}
- } while(!(flags & BLK_MIG_FLAG_EOS));
-
+ } while (!(flags & BLK_MIG_FLAG_EOS));
+
qemu_free(buf);
return 0;
@@ -525,33 +508,28 @@ static void block_set_params(int blk_enable, int shared_base, void *opaque)
block_mig_state->blk_enable = blk_enable;
block_mig_state->shared_base = shared_base;
-
+
/* shared base means that blk_enable = 1 */
block_mig_state->blk_enable |= shared_base;
-
- return;
}
void blk_mig_info(void)
{
BlockDriverState *bs;
-
+
for (bs = bdrv_first; bs != NULL; bs = bs->next) {
printf("Device %s\n", bs->device_name);
- if(bs->type == BDRV_TYPE_HD) {
- printf("device %s format %s\n",
+ if (bs->type == BDRV_TYPE_HD) {
+ printf("device %s format %s\n",
bs->device_name, bs->drv->format_name);
}
}
}
void blk_mig_init(void)
-{
-
+{
block_mig_state = qemu_mallocz(sizeof(BlkMigState));
-
- register_savevm_live("block", 0, 1, block_set_params, block_save_live,
- NULL, block_load, block_mig_state);
-
+ register_savevm_live("block", 0, 1, block_set_params, block_save_live,
+ NULL, block_load, block_mig_state);
}
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-12 07:32:15 +0000