From 319bd5edb92addc725b2701d73381c415146c287 Mon Sep 17 00:00:00 2001 From: Vladimir Sementsov-Ogievskiy Date: Tue, 30 Jul 2019 19:32:49 +0300 Subject: [PATCH] block/backup: deal with zero detection We have detect_zeroes option, so at least for blockdev-backup user should define it if zero-detection is needed. For drive-backup leave detection enabled by default but do it through existing option instead of open-coding. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: John Snow Reviewed-by: Max Reitz Message-id: 20190730163251.755248-2-vsementsov@virtuozzo.com Signed-off-by: John Snow --- block/backup.c | 15 ++++++--------- blockdev.c | 8 ++++---- 2 files changed, 10 insertions(+), 13 deletions(-) diff --git a/block/backup.c b/block/backup.c index a9be07258c..083fc189af 100644 --- a/block/backup.c +++ b/block/backup.c @@ -113,7 +113,10 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, BlockBackend *blk = job->common.blk; int nbytes; int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0; - int write_flags = job->serialize_target_writes ? BDRV_REQ_SERIALISING : 0; + int write_flags = + (job->serialize_target_writes ? BDRV_REQ_SERIALISING : 0) | + (job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0); + assert(QEMU_IS_ALIGNED(start, job->cluster_size)); bdrv_reset_dirty_bitmap(job->copy_bitmap, start, job->cluster_size); @@ -131,14 +134,8 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, goto fail; } - if (buffer_is_zero(*bounce_buffer, nbytes)) { - ret = blk_co_pwrite_zeroes(job->target, start, - nbytes, write_flags | BDRV_REQ_MAY_UNMAP); - } else { - ret = blk_co_pwrite(job->target, start, - nbytes, *bounce_buffer, write_flags | - (job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0)); - } + ret = blk_co_pwrite(job->target, start, nbytes, *bounce_buffer, + write_flags); if (ret < 0) { trace_backup_do_cow_write_fail(job, start, ret); if (error_is_read) { diff --git a/blockdev.c b/blockdev.c index 64d06d1f67..2e536dde3e 100644 --- a/blockdev.c +++ b/blockdev.c @@ -3615,7 +3615,7 @@ static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, BlockDriverState *source = NULL; BlockJob *job = NULL; AioContext *aio_context; - QDict *options = NULL; + QDict *options; Error *local_err = NULL; int flags; int64_t size; @@ -3688,10 +3688,10 @@ static BlockJob *do_drive_backup(DriveBackup *backup, JobTxn *txn, goto out; } + options = qdict_new(); + qdict_put_str(options, "discard", "unmap"); + qdict_put_str(options, "detect-zeroes", "unmap"); if (backup->format) { - if (!options) { - options = qdict_new(); - } qdict_put_str(options, "driver", backup->format); } -- 2.11.4.GIT