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block-migration: document usage of state across threads 

Reviewed-by: Orit Wasserman <owasserm@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
This commit is contained in:
Paolo Bonzini 2013-02-22 17:36:24 +01:00 committed by Juan Quintela
parent 13197e3cba
commit 323920c4ea
1 changed files with 18 additions and 5 deletions
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23
block-migration.c
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@ -43,18 +43,24 @@
#endif
typedef struct BlkMigDevState {
/* Written during setup phase. Can be read without a lock. */
BlockDriverState *bs;
int bulk_completed;
int shared_base;
int64_t cur_sector;
int64_t cur_dirty;
int64_t completed_sectors;
int64_t total_sectors;
QSIMPLEQ_ENTRY(BlkMigDevState) entry;
/* Only used by migration thread. Does not need a lock. */
int bulk_completed;
int64_t cur_sector;
int64_t cur_dirty;
/* Protected by iothread lock. */
unsigned long *aio_bitmap;
int64_t completed_sectors;
} BlkMigDevState;
typedef struct BlkMigBlock {
/* Only used by migration thread. */
uint8_t *buf;
BlkMigDevState *bmds;
int64_t sector;
@ -62,19 +68,26 @@ typedef struct BlkMigBlock {
struct iovec iov;
QEMUIOVector qiov;
BlockDriverAIOCB *aiocb;
/* Protected by iothread lock. */
int ret;
QSIMPLEQ_ENTRY(BlkMigBlock) entry;
} BlkMigBlock;
typedef struct BlkMigState {
/* Written during setup phase. Can be read without a lock. */
int blk_enable;
int shared_base;
QSIMPLEQ_HEAD(bmds_list, BlkMigDevState) bmds_list;
int64_t total_sector_sum;
/* Protected by iothread lock. */
QSIMPLEQ_HEAD(blk_list, BlkMigBlock) blk_list;
int submitted;
int read_done;
/* Only used by migration thread. Does not need a lock. */
int transferred;
int64_t total_sector_sum;
int prev_progress;
int bulk_completed;
} BlkMigState;