#include "trace.h"
#include "block/block.h"
#include "block/block_int.h"
-#include "block/blockjob.h"
+#include "block/blockjob_int.h"
+#include "block/block_backup.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qemu/ratelimit.h"
#include "qemu/cutils.h"
#include "sysemu/block-backend.h"
#include "qemu/bitmap.h"
+#include "qemu/error-report.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;
retry = false;
QLIST_FOREACH(req, &job->inflight_reqs, list) {
if (end > req->start && start < req->end) {
- qemu_co_queue_wait(&req->wait_queue);
+ qemu_co_queue_wait(&req->wait_queue, NULL);
retry = true;
break;
}
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);
}
}
+static void backup_clean(BlockJob *job)
+{
+ BackupBlockJob *s = container_of(job, BackupBlockJob, common);
+ assert(s->target);
+ blk_unref(s->target);
+ s->target = NULL;
+}
+
static void backup_attached_aio_context(BlockJob *job, AioContext *aio_context)
{
BackupBlockJob *s = container_of(job, BackupBlockJob, common);
blk_set_aio_context(s->target, aio_context);
}
-static const BlockJobDriver backup_job_driver = {
- .instance_size = sizeof(BackupBlockJob),
- .job_type = BLOCK_JOB_TYPE_BACKUP,
- .set_speed = backup_set_speed,
- .commit = backup_commit,
- .abort = backup_abort,
- .attached_aio_context = backup_attached_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 BlockErrorAction backup_error_action(BackupBlockJob *job,
bool read, int error)
static void backup_complete(BlockJob *job, void *opaque)
{
- BackupBlockJob *s = container_of(job, BackupBlockJob, common);
BackupCompleteData *data = opaque;
- blk_unref(s->target);
-
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;
/* Both FULL and TOP SYNC_MODE's require copying.. */
for (; start < end; start++) {
bool error_is_read;
+ int alloced = 0;
+
if (yield_and_check(job)) {
break;
}
if (job->sync_mode == MIRROR_SYNC_MODE_TOP) {
int i, n;
- int alloced = 0;
/* Check to see if these blocks are already in the
* backing file. */
sectors_per_cluster - i, &n);
i += n;
- if (alloced == 1 || n == 0) {
+ if (alloced || n == 0) {
break;
}
}
}
}
/* FULL sync mode we copy the whole drive. */
- ret = backup_do_cow(job, start * sectors_per_cluster,
- sectors_per_cluster, &error_is_read, false);
+ if (alloced < 0) {
+ ret = alloced;
+ } else {
+ ret = backup_do_cow(job, start * sectors_per_cluster,
+ sectors_per_cluster, &error_is_read,
+ false);
+ }
if (ret < 0) {
/* Depending on error action, fail now or retry cluster */
BlockErrorAction action =
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,
+static const BlockJobDriver backup_job_driver = {
+ .instance_size = sizeof(BackupBlockJob),
+ .job_type = BLOCK_JOB_TYPE_BACKUP,
+ .start = backup_run,
+ .set_speed = backup_set_speed,
+ .commit = backup_commit,
+ .abort = backup_abort,
+ .clean = backup_clean,
+ .attached_aio_context = backup_attached_aio_context,
+ .drain = backup_drain,
+};
+
+BlockJob *backup_job_create(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,
+ int creation_flags,
BlockCompletionFunc *cb, void *opaque,
BlockJobTxn *txn, Error **errp)
{
if (bs == target) {
error_setg(errp, "Source and target cannot be the same");
- return;
+ return NULL;
}
if (!bdrv_is_inserted(bs)) {
error_setg(errp, "Device is not inserted: %s",
bdrv_get_device_name(bs));
- return;
+ return NULL;
}
if (!bdrv_is_inserted(target)) {
error_setg(errp, "Device is not inserted: %s",
bdrv_get_device_name(target));
- return;
+ return NULL;
+ }
+
+ 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 NULL;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_BACKUP_SOURCE, errp)) {
- return;
+ return NULL;
}
if (bdrv_op_is_blocked(target, BLOCK_OP_TYPE_BACKUP_TARGET, errp)) {
- return;
+ return NULL;
}
if (sync_mode == MIRROR_SYNC_MODE_INCREMENTAL) {
if (!sync_bitmap) {
error_setg(errp, "must provide a valid bitmap name for "
"\"incremental\" sync mode");
- return;
+ return NULL;
}
/* Create a new bitmap, and freeze/disable this one. */
if (bdrv_dirty_bitmap_create_successor(bs, sync_bitmap, errp) < 0) {
- return;
+ return NULL;
}
} else if (sync_bitmap) {
error_setg(errp,
"a sync_bitmap was provided to backup_run, "
"but received an incompatible sync_mode (%s)",
MirrorSyncMode_lookup[sync_mode]);
- return;
+ return NULL;
}
len = bdrv_getlength(bs);
goto error;
}
- job = block_job_create(job_id, &backup_job_driver, bs, speed,
- cb, opaque, errp);
+ /* job->common.len is fixed, so we can't allow resize */
+ job = block_job_create(job_id, &backup_job_driver, bs,
+ BLK_PERM_CONSISTENT_READ,
+ BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
+ BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD,
+ speed, creation_flags, cb, opaque, errp);
if (!job) {
goto error;
}
- job->target = blk_new();
- blk_insert_bs(job->target, target);
+ /* The target must match the source in size, so no resize here either */
+ job->target = blk_new(BLK_PERM_WRITE,
+ BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE |
+ BLK_PERM_WRITE_UNCHANGED | BLK_PERM_GRAPH_MOD);
+ ret = blk_insert_bs(job->target, target, errp);
+ if (ret < 0) {
+ goto error;
+ }
job->on_source_error = on_source_error;
job->on_target_error = on_target_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
* targets with a backing file, try to avoid COW if possible. */
ret = bdrv_get_info(target, &bdi);
- if (ret < 0 && !target->backing) {
+ if (ret == -ENOTSUP && !target->backing) {
+ /* Cluster size is not defined */
+ error_report("WARNING: The target block device doesn't provide "
+ "information about the block size and it doesn't have a "
+ "backing file. The default block size of %u bytes is "
+ "used. If the actual block size of the target exceeds "
+ "this default, the backup may be unusable",
+ BACKUP_CLUSTER_SIZE_DEFAULT);
+ job->cluster_size = BACKUP_CLUSTER_SIZE_DEFAULT;
+ } else if (ret < 0 && !target->backing) {
error_setg_errno(errp, -ret,
"Couldn't determine the cluster size of the target image, "
"which has no backing file");
job->cluster_size = MAX(BACKUP_CLUSTER_SIZE_DEFAULT, bdi.cluster_size);
}
- bdrv_op_block_all(target, job->common.blocker);
+ /* Required permissions are already taken with target's blk_new() */
+ block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL,
+ &error_abort);
job->common.len = len;
- job->common.co = qemu_coroutine_create(backup_run, job);
block_job_txn_add_job(txn, &job->common);
- qemu_coroutine_enter(job->common.co);
- return;
+
+ return &job->common;
error:
if (sync_bitmap) {
bdrv_reclaim_dirty_bitmap(bs, sync_bitmap, NULL);
}
if (job) {
- blk_unref(job->target);
+ backup_clean(&job->common);
block_job_unref(&job->common);
}
+
+ return NULL;
}
projects / mirror_qemu.git / blobdiff