diff options
Diffstat (limited to 'block/backup.c')
| -rw-r--r-- | block/backup.c | 59 |
1 files changed, 52 insertions, 7 deletions
diff --git a/block/backup.c b/block/backup.c index bb3bb9a9eb..582bd0f7ee 100644 --- a/block/backup.c +++ b/block/backup.c @@ -17,6 +17,7 @@ #include "block/block.h" #include "block/block_int.h" #include "block/blockjob.h" +#include "block/block_backup.h" #include "qapi/error.h" #include "qapi/qmp/qerror.h" #include "qemu/ratelimit.h" @@ -27,13 +28,6 @@ #define BACKUP_CLUSTER_SIZE_DEFAULT (1 << 16) #define SLICE_TIME 100000000ULL /* ns */ -typedef struct CowRequest { - int64_t start; - int64_t end; - QLIST_ENTRY(CowRequest) list; - CoQueue wait_queue; /* coroutines blocked on this request */ -} CowRequest; - typedef struct BackupBlockJob { BlockJob common; BlockBackend *target; @@ -255,6 +249,57 @@ static void backup_attached_aio_context(BlockJob *job, AioContext *aio_context) blk_set_aio_context(s->target, aio_context); } +void backup_do_checkpoint(BlockJob *job, Error **errp) +{ + BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common); + int64_t len; + + assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP); + + if (backup_job->sync_mode != MIRROR_SYNC_MODE_NONE) { + error_setg(errp, "The backup job only supports block checkpoint in" + " sync=none mode"); + return; + } + + len = DIV_ROUND_UP(backup_job->common.len, backup_job->cluster_size); + bitmap_zero(backup_job->done_bitmap, len); +} + +void backup_wait_for_overlapping_requests(BlockJob *job, int64_t sector_num, + int nb_sectors) +{ + BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common); + int64_t sectors_per_cluster = cluster_size_sectors(backup_job); + int64_t start, end; + + assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP); + + start = sector_num / sectors_per_cluster; + end = DIV_ROUND_UP(sector_num + nb_sectors, sectors_per_cluster); + wait_for_overlapping_requests(backup_job, start, end); +} + +void backup_cow_request_begin(CowRequest *req, BlockJob *job, + int64_t sector_num, + int nb_sectors) +{ + BackupBlockJob *backup_job = container_of(job, BackupBlockJob, common); + int64_t sectors_per_cluster = cluster_size_sectors(backup_job); + int64_t start, end; + + assert(job->driver->job_type == BLOCK_JOB_TYPE_BACKUP); + + start = sector_num / sectors_per_cluster; + end = DIV_ROUND_UP(sector_num + nb_sectors, sectors_per_cluster); + cow_request_begin(req, backup_job, start, end); +} + +void backup_cow_request_end(CowRequest *req) +{ + cow_request_end(req); +} + static const BlockJobDriver backup_job_driver = { .instance_size = sizeof(BackupBlockJob), .job_type = BLOCK_JOB_TYPE_BACKUP, |