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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>
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parent
d51a2427f6
commit
2ec711dcd4
18
block/vpc.c
18
block/vpc.c
@ -602,7 +602,7 @@ static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
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{
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BDRVVPCState *s = bs->opaque;
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VHDFooter *footer = (VHDFooter*) s->footer_buf;
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int64_t start, offset, next;
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int64_t start, offset;
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bool allocated;
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int n;
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@ -626,20 +626,18 @@ static int64_t coroutine_fn vpc_co_get_block_status(BlockDriverState *bs,
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*pnum += n;
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sector_num += n;
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nb_sectors -= n;
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next = start + (*pnum * BDRV_SECTOR_SIZE);
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/* *pnum can't be greater than one block for allocated
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* sectors since there is always a bitmap in between. */
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if (allocated) {
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return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
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}
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if (nb_sectors == 0) {
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break;
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}
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offset = get_sector_offset(bs, sector_num, 0);
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} while ((allocated && offset == next) || (!allocated && offset == -1));
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} while (offset == -1);
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if (allocated) {
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return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID | start;
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} else {
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return 0;
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}
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return 0;
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}
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/*
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