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20:8IqLJhObr1/dc9PcxNGEgoRWBF+Geo5lp/g2BfiWI0w+fklQgTTY541sgTk9DbSQ2+4+3AMOku9VawZNFhEE+KeCIJlb8hKATiUs7JvbMiIWR3pcOjioauEsHsWQCse+6ubGVmbmXr+ZHuO1Lu07XKaOG/b5ZZqCOt05/J+utAU= X-OriginatorOrg: virtuozzo.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 May 2017 09:35:06.3724 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM5PR0801MB1988 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.2.118 Subject: [Qemu-devel] [PATCH v1 02/13] qcow2: is_zero_sectors(): return true if area is outside of backing file X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, Anton Nefedov , den@virtuozzo.com, mreitz@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" in such case, bdrv_get_block_status() shall return 0, *nr == 0 iotest 154 updated accordingly: write-zeroes tail alignment can be detected as zeroes now, so pwrite_zeroes succeeds Signed-off-by: Anton Nefedov --- block/qcow2.c | 6 ++++-- tests/qemu-iotests/154.out | 4 ++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 2e6a0ec..b885dfc 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2482,7 +2482,7 @@ static bool is_zero_sectors(BlockDriverState *bs, int64_t start, int64_t res; if (start + count > bs->total_sectors) { - count = bs->total_sectors - start; + count = start < bs->total_sectors ? bs->total_sectors - start : 0; } if (!count) { @@ -2490,7 +2490,9 @@ static bool is_zero_sectors(BlockDriverState *bs, int64_t start, } res = bdrv_get_block_status_above(bs, NULL, start, count, &nr, &file); - return res >= 0 && (res & BDRV_BLOCK_ZERO) && nr == count; + return res >= 0 + && (((res & BDRV_BLOCK_ZERO) && nr == count) + || nr == 0); } static coroutine_fn int qcow2_co_pwrite_zeroes(BlockDriverState *bs, diff --git a/tests/qemu-iotests/154.out b/tests/qemu-iotests/154.out index d8485ee..259340e 100644 --- a/tests/qemu-iotests/154.out +++ b/tests/qemu-iotests/154.out @@ -322,7 +322,7 @@ wrote 1024/1024 bytes at offset 134218240 1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 2048/2048 bytes allocated at offset 128 MiB [{ "start": 0, "length": 134217728, "depth": 1, "zero": true, "data": false}, -{ "start": 134217728, "length": 2048, "depth": 0, "zero": false, "data": true, "offset": OFFSET}] +{ "start": 134217728, "length": 2048, "depth": 0, "zero": true, "data": false}] Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134219776 backing_file=TEST_DIR/t.IMGFMT.base wrote 2048/2048 bytes at offset 134217728 2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) @@ -348,7 +348,7 @@ wrote 1024/1024 bytes at offset 134218240 1 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec) 2048/2048 bytes allocated at offset 128 MiB [{ "start": 0, "length": 134217728, "depth": 1, "zero": true, "data": false}, -{ "start": 134217728, "length": 2048, "depth": 0, "zero": false, "data": true, "offset": OFFSET}] +{ "start": 134217728, "length": 2048, "depth": 0, "zero": true, "data": false}] Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134219776 backing_file=TEST_DIR/t.IMGFMT.base wrote 2048/2048 bytes at offset 134217728 2 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)