From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53486) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmOSz-0005Dm-VY for qemu-devel@nongnu.org; Mon, 19 May 2014 10:23:09 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WmOSn-00047a-8I for qemu-devel@nongnu.org; Mon, 19 May 2014 10:23:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:1708) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WmOSn-00047I-0O for qemu-devel@nongnu.org; Mon, 19 May 2014 10:22:49 -0400 Received: from int-mx12.intmail.prod.int.phx2.redhat.com (int-mx12.intmail.prod.int.phx2.redhat.com [10.5.11.25]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s4JEMmt1017964 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK) for ; Mon, 19 May 2014 10:22:48 -0400 From: Kevin Wolf Date: Mon, 19 May 2014 16:22:19 +0200 Message-Id: <1400509360-25470-2-git-send-email-kwolf@redhat.com> In-Reply-To: <1400509360-25470-1-git-send-email-kwolf@redhat.com> References: <1400509360-25470-1-git-send-email-kwolf@redhat.com> Subject: [Qemu-devel] [PULL 01/22] block: Fix bdrv_is_allocated() for short backing files List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: kwolf@redhat.com bdrv_is_allocated() shouldn't return true for sectors that are unallocated, but after the end of a short backing file, even though such sectors are (correctly) marked as containing zeros. Signed-off-by: Kevin Wolf Reviewed-by: Max Reitz --- block.c | 10 ++++++---- include/block/block.h | 11 +++++++---- 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/block.c b/block.c index c90c71a..65e8191 100644 --- a/block.c +++ b/block.c @@ -3864,7 +3864,7 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, if (!bs->drv->bdrv_co_get_block_status) { *pnum = nb_sectors; - ret = BDRV_BLOCK_DATA; + ret = BDRV_BLOCK_DATA | BDRV_BLOCK_ALLOCATED; if (bs->drv->protocol_name) { ret |= BDRV_BLOCK_OFFSET_VALID | (sector_num * BDRV_SECTOR_SIZE); } @@ -3883,6 +3883,10 @@ static int64_t coroutine_fn bdrv_co_get_block_status(BlockDriverState *bs, *pnum, pnum); } + if (ret & (BDRV_BLOCK_DATA | BDRV_BLOCK_ZERO)) { + ret |= BDRV_BLOCK_ALLOCATED; + } + if (!(ret & BDRV_BLOCK_DATA) && !(ret & BDRV_BLOCK_ZERO)) { if (bdrv_unallocated_blocks_are_zero(bs)) { ret |= BDRV_BLOCK_ZERO; @@ -3959,9 +3963,7 @@ int coroutine_fn bdrv_is_allocated(BlockDriverState *bs, int64_t sector_num, if (ret < 0) { return ret; } - return - (ret & BDRV_BLOCK_DATA) || - ((ret & BDRV_BLOCK_ZERO) && !bdrv_has_zero_init(bs)); + return (ret & BDRV_BLOCK_ALLOCATED); } /* diff --git a/include/block/block.h b/include/block/block.h index 1b119aa..59be83f 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -120,6 +120,8 @@ typedef enum { /* BDRV_BLOCK_DATA: data is read from bs->file or another file * BDRV_BLOCK_ZERO: sectors read as zero * BDRV_BLOCK_OFFSET_VALID: sector stored in bs->file as raw data + * BDRV_BLOCK_ALLOCATED: the content of the block is determined by this + * layer (as opposed to the backing file) * BDRV_BLOCK_RAW: used internally to indicate that the request * was answered by the raw driver and that one * should look in bs->file directly. @@ -141,10 +143,11 @@ typedef enum { * f t f not allocated or unknown offset, read as zero * f f f not allocated or unknown offset, read from backing_hd */ -#define BDRV_BLOCK_DATA 1 -#define BDRV_BLOCK_ZERO 2 -#define BDRV_BLOCK_OFFSET_VALID 4 -#define BDRV_BLOCK_RAW 8 +#define BDRV_BLOCK_DATA 0x01 +#define BDRV_BLOCK_ZERO 0x02 +#define BDRV_BLOCK_OFFSET_VALID 0x04 +#define BDRV_BLOCK_RAW 0x08 +#define BDRV_BLOCK_ALLOCATED 0x10 #define BDRV_BLOCK_OFFSET_MASK BDRV_SECTOR_MASK typedef enum { -- 1.8.3.1