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| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2019-07-30 19:32:49 +0300 |
|---|---|---|
| committer | John Snow <jsnow@redhat.com> | 2019-08-16 18:29:43 -0400 |
| commit | 319bd5edb92addc725b2701d73381c415146c287 (patch) | |
| tree | 386c8c029f130a3fb727ac990a7156caa48b9e2b /block | |
| parent | 590a63d5983c9cdf2e1bf96a519532949963085d (diff) | |
| download | qemu-319bd5edb92addc725b2701d73381c415146c287.zip qemu-319bd5edb92addc725b2701d73381c415146c287.tar.gz qemu-319bd5edb92addc725b2701d73381c415146c287.tar.bz2 | |
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 <vsementsov@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20190730163251.755248-2-vsementsov@virtuozzo.com
Signed-off-by: John Snow <jsnow@redhat.com>
Diffstat (limited to 'block')
| -rw-r--r-- | block/backup.c | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/block/backup.c b/block/backup.c index a9be072..083fc18 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) { |