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| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2017-04-07 14:34:04 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-04-28 16:02:03 +0200 |
| commit | 9f1b92add20d244677c916e77d840b6282f691ac (patch) | |
| tree | d1b136a0f194809679f7119ffc6c1878e8f44f2a /qemu-img.c | |
| parent | 504c205a0d4a790dba2be0dc0aab8b8d1b905a7d (diff) | |
| download | qemu-9f1b92add20d244677c916e77d840b6282f691ac.tar.gz | |
qemu-img: improve convert_iteration_sectors()
Do not do extra call to _get_block_status()
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20170407113404.9351-1-vsementsov@virtuozzo.com
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'qemu-img.c')
| -rw-r--r-- | qemu-img.c | 32 |
1 files changed, 10 insertions, 22 deletions
diff --git a/qemu-img.c b/qemu-img.c index 9eb82830f7..9b6e72893a 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -1554,9 +1554,15 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num) if (s->sector_next_status <= sector_num) { BlockDriverState *file; - ret = bdrv_get_block_status(blk_bs(s->src[src_cur]), - sector_num - src_cur_offset, - n, &n, &file); + if (s->target_has_backing) { + ret = bdrv_get_block_status(blk_bs(s->src[src_cur]), + sector_num - src_cur_offset, + n, &n, &file); + } else { + ret = bdrv_get_block_status_above(blk_bs(s->src[src_cur]), NULL, + sector_num - src_cur_offset, + n, &n, &file); + } if (ret < 0) { return ret; } @@ -1565,26 +1571,8 @@ static int convert_iteration_sectors(ImgConvertState *s, int64_t sector_num) s->status = BLK_ZERO; } else if (ret & BDRV_BLOCK_DATA) { s->status = BLK_DATA; - } else if (!s->target_has_backing) { - /* Without a target backing file we must copy over the contents of - * the backing file as well. */ - /* Check block status of the backing file chain to avoid - * needlessly reading zeroes and limiting the iteration to the - * buffer size */ - ret = bdrv_get_block_status_above(blk_bs(s->src[src_cur]), NULL, - sector_num - src_cur_offset, - n, &n, &file); - if (ret < 0) { - return ret; - } - - if (ret & BDRV_BLOCK_ZERO) { - s->status = BLK_ZERO; - } else { - s->status = BLK_DATA; - } } else { - s->status = BLK_BACKING_FILE; + s->status = s->target_has_backing ? BLK_BACKING_FILE : BLK_DATA; } s->sector_next_status = sector_num + n; |