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block/vpc: optimize vpc_co_get_block_status 

*pnum can't be greater than s->block_size / BDRV_SECTOR_SIZE for allocated
sectors since there is always a bitmap in between.

Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 1425379316-19639-2-git-send-email-pl@kamp.de
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Peter Lieven 2015-03-03 11:41:52 +01:00 committed by Max Reitz
parent d51a2427f6
commit 2ec711dcd4
1 changed files with 8 additions and 10 deletions
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18
block/vpc.c
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@ -602,7 +602,7 @@ static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
{ {
BDRVVPCState *s = bs->opaque; BDRVVPCState *s = bs->opaque;
VHDFooter *footer = (VHDFooter*) s->footer_buf; VHDFooter *footer = (VHDFooter*) s->footer_buf;
int64_t start, offset, next; int64_t start, offset;
bool allocated; bool allocated;
int n; int n;
@ -626,20 +626,18 @@ static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
*pnum += n; *pnum += n;
sector_num += n; sector_num += n;
nb_sectors -= n; nb_sectors -= n;
next = start + (*pnum * BDRV_SECTOR_SIZE); /* *pnum can't be greater than one block for allocated
* sectors since there is always a bitmap in between. */
if (allocated) {
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
}
if (nb_sectors == 0) { if (nb_sectors == 0) {
break; break;
} }
offset = get_sector_offset(bs, sector_num, 0); offset = get_sector_offset(bs, sector_num, 0);
} while ((allocated && offset == next) || (!allocated && offset == -1)); } while (offset == -1);
if (allocated) { return 0;
return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
} else {
return 0;
}
} }
/* /*