#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"
#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;
uint64_t sectors_read;
unsigned long *done_bitmap;
int64_t cluster_size;
+ bool compress;
NotifierWithReturn before_write;
QLIST_HEAD(, CowRequest) inflight_reqs;
} BackupBlockJob;
bounce_qiov.size, BDRV_REQ_MAY_UNMAP);
} else {
ret = blk_co_pwritev(job->target, start * job->cluster_size,
- bounce_qiov.size, &bounce_qiov, 0);
+ bounce_qiov.size, &bounce_qiov,
+ job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0);
}
if (ret < 0) {
trace_backup_do_cow_write_fail(job, start, ret);
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 void backup_drain(BlockJob *job)
+{
+ BackupBlockJob *s = container_of(job, BackupBlockJob, common);
+
+ /* Need to keep a reference in case blk_drain triggers execution
+ * of backup_complete...
+ */
+ if (s->target) {
+ BlockBackend *target = s->target;
+ blk_ref(target);
+ blk_drain(target);
+ blk_unref(target);
+ }
+}
+
static const BlockJobDriver backup_job_driver = {
.instance_size = sizeof(BackupBlockJob),
.job_type = BLOCK_JOB_TYPE_BACKUP,
.commit = backup_commit,
.abort = backup_abort,
.attached_aio_context = backup_attached_aio_context,
+ .drain = backup_drain,
};
static BlockErrorAction backup_error_action(BackupBlockJob *job,
BackupCompleteData *data = opaque;
blk_unref(s->target);
+ s->target = NULL;
block_job_completed(job, data->ret);
g_free(data);
int64_t end;
int64_t last_cluster = -1;
int64_t sectors_per_cluster = cluster_size_sectors(job);
- HBitmapIter hbi;
+ BdrvDirtyBitmapIter *dbi;
granularity = bdrv_dirty_bitmap_granularity(job->sync_bitmap);
clusters_per_iter = MAX((granularity / job->cluster_size), 1);
- bdrv_dirty_iter_init(job->sync_bitmap, &hbi);
+ dbi = bdrv_dirty_iter_new(job->sync_bitmap, 0);
/* Find the next dirty sector(s) */
- while ((sector = hbitmap_iter_next(&hbi)) != -1) {
+ while ((sector = bdrv_dirty_iter_next(dbi)) != -1) {
cluster = sector / sectors_per_cluster;
/* Fake progress updates for any clusters we skipped */
for (end = cluster + clusters_per_iter; cluster < end; cluster++) {
do {
if (yield_and_check(job)) {
- return ret;
+ goto out;
}
ret = backup_do_cow(job, cluster * sectors_per_cluster,
sectors_per_cluster, &error_is_read,
if ((ret < 0) &&
backup_error_action(job, error_is_read, -ret) ==
BLOCK_ERROR_ACTION_REPORT) {
- return ret;
+ goto out;
}
} while (ret < 0);
}
/* If the bitmap granularity is smaller than the backup granularity,
* we need to advance the iterator pointer to the next cluster. */
if (granularity < job->cluster_size) {
- bdrv_set_dirty_iter(&hbi, cluster * sectors_per_cluster);
+ bdrv_set_dirty_iter(dbi, cluster * sectors_per_cluster);
}
last_cluster = cluster - 1;
job->common.offset += ((end - last_cluster - 1) * job->cluster_size);
}
+out:
+ bdrv_dirty_iter_free(dbi);
return ret;
}
BackupBlockJob *job = opaque;
BackupCompleteData *data;
BlockDriverState *bs = blk_bs(job->common.blk);
- BlockBackend *target = job->target;
int64_t start, end;
int64_t sectors_per_cluster = cluster_size_sectors(job);
int ret = 0;
qemu_co_rwlock_unlock(&job->flush_rwlock);
g_free(job->done_bitmap);
- bdrv_op_unblock_all(blk_bs(target), job->common.blocker);
-
data = g_malloc(sizeof(*data));
data->ret = ret;
block_job_defer_to_main_loop(&job->common, backup_complete, data);
void backup_start(const char *job_id, BlockDriverState *bs,
BlockDriverState *target, int64_t speed,
MirrorSyncMode sync_mode, BdrvDirtyBitmap *sync_bitmap,
+ bool compress,
BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
BlockCompletionFunc *cb, void *opaque,
return;
}
+ if (compress && target->drv->bdrv_co_pwritev_compressed == NULL) {
+ error_setg(errp, "Compression is not supported for this drive %s",
+ bdrv_get_device_name(target));
+ return;
+ }
+
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
return;
}
}
job = block_job_create(job_id, &backup_job_driver, bs, speed,
- cb, opaque, errp);
+ BLOCK_JOB_DEFAULT, cb, opaque, errp);
if (!job) {
goto error;
}
job->sync_mode = sync_mode;
job->sync_bitmap = sync_mode == MIRROR_SYNC_MODE_INCREMENTAL ?
sync_bitmap : NULL;
+ job->compress = compress;
/* If there is no backing file on the target, we cannot rely on COW if our
* backup cluster size is smaller than the target cluster size. Even for
job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
}
- bdrv_op_block_all(target, job->common.blocker);
+ block_job_add_bdrv(&job->common, target);
job->common.len = len;
job->common.co = qemu_coroutine_create(backup_run, job);
block_job_txn_add_job(txn, &job->common);
projects / mirror_qemu.git / blobdiff