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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.7.99; envelope-from=vsementsov@virtuozzo.com; helo=EUR04-HE1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/30 07:10:48 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Received-From: 40.107.7.99 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, fam@euphon.net, integration@gluster.org, berto@igalia.com, pavel.dovgaluk@ispras.ru, dillaman@redhat.com, qemu-devel@nongnu.org, sw@weilnetz.de, pl@kamp.de, ronniesahlberg@gmail.com, mreitz@redhat.com, den@openvz.org, sheepdog@lists.wpkg.org, vsementsov@virtuozzo.com, stefanha@redhat.com, namei.unix@gmail.com, pbonzini@redhat.com, jsnow@redhat.com, ari@tuxera.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @virtuozzo.com) Content-Type: text/plain; charset="utf-8" We are generally moving to int64_t for both offset and bytes parameters on all io paths. Main motivation is realization of 64-bit write_zeroes operation for fast zeroing large disk chunks, up to the whole disk. We chose signed type, to be consistent with off_t (which is signed) and with possibility for signed return type (where negative value means error). So, convert bdrv_check_byte_request() now. Patch-correctness audit by Eric Blake: This changes an unsigned to signed value on 64-bit machines, and additionally widens the parameter on 32-bit machines. Existing callers: bdrv_co_preadv_part() with 'unsigned int' - no impact bdrv_co_pwritev_part() with 'unsigned int' - no impact bdrv_co_copy_range_internal() with 'uint64_t' - potentially fixes a latent bug on 32-bit machines. Requires a larger audit to see how bdrv_co_copy_range() and friends are used: block/block-backend.c:blk_co_copy_range() - passes 'int', thus < 2G block/block-copy.c:block_copy_do_copy() - passes 'int64_t', but only after assert(nbytes < INT_MAX); also it has a BLOCK_COPY_MAX_COPY_RANGE set to 16M that factors into its calculations on how much to do per iteration So it looks like at present we are safe. Series: 64bit-block-status Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Eric Blake Reviewed-by: Alberto Garcia --- block/io.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/block/io.c b/block/io.c index 20ebf3c536..7a7d4e578d 100644 --- a/block/io.c +++ b/block/io.c @@ -875,9 +875,9 @@ static bool coroutine_fn bdrv_wait_serialising_requests= (BdrvTrackedRequest *self } =20 static int bdrv_check_byte_request(BlockDriverState *bs, int64_t offset, - size_t size) + int64_t bytes) { - if (size > BDRV_REQUEST_MAX_BYTES) { + if (bytes > BDRV_REQUEST_MAX_BYTES) { return -EIO; } =20 @@ -885,7 +885,7 @@ static int bdrv_check_byte_request(BlockDriverState *bs= , int64_t offset, return -ENOMEDIUM; } =20 - if (offset < 0) { + if (offset < 0 || bytes < 0) { return -EIO; } =20 --=20 2.21.0