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qemu-img: Switch get_block_status() to byte-based

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We are gradually converting to byte-based interfaces, as they are
easier to reason about than sector-based.  Continue by converting
an internal function (no semantic change), and simplifying its
caller accordingly.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2017-10-11 22:47:02 -05:00 committed by Kevin Wolf
parent 7286d6106f
commit 5e344dd8c2
1 changed files with 11 additions and 13 deletions
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24
qemu-img.c
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@ -2671,14 +2671,16 @@ static void dump_map_entry(OutputFormat output_format, MapEntry *e,
}
}
static int get_block_status(BlockDriverState *bs, int64_t sector_num,
int nb_sectors, MapEntry *e)
static int get_block_status(BlockDriverState *bs, int64_t offset,
int64_t bytes, MapEntry *e)
{
int64_t ret;
int depth;
BlockDriverState *file;
bool has_offset;
int nb_sectors = bytes >> BDRV_SECTOR_BITS;
assert(bytes < INT_MAX);
/* As an optimization, we could cache the current range of unallocated
* clusters in each file of the chain, and avoid querying the same
* range repeatedly.
@ -2686,8 +2688,8 @@ static int get_block_status(BlockDriverState *bs, int64_t sector_num,
depth = 0;
for (;;) {
ret = bdrv_get_block_status(bs, sector_num, nb_sectors, &nb_sectors,
&file);
ret = bdrv_get_block_status(bs, offset >> BDRV_SECTOR_BITS, nb_sectors,
&nb_sectors, &file);
if (ret < 0) {
return ret;
}
@ -2707,7 +2709,7 @@ static int get_block_status(BlockDriverState *bs, int64_t sector_num,
has_offset = !!(ret & BDRV_BLOCK_OFFSET_VALID);
*e = (MapEntry) {
.start = sector_num * BDRV_SECTOR_SIZE,
.start = offset,
.length = nb_sectors * BDRV_SECTOR_SIZE,
.data = !!(ret & BDRV_BLOCK_DATA),
.zero = !!(ret & BDRV_BLOCK_ZERO),
@ -2837,16 +2839,12 @@ static int img_map(int argc, char **argv)
length = blk_getlength(blk);
while (curr.start + curr.length < length) {
int64_t nsectors_left;
int64_t sector_num;
int n;
sector_num = (curr.start + curr.length) >> BDRV_SECTOR_BITS;
int64_t offset = curr.start + curr.length;
int64_t n;
/* Probe up to 1 GiB at a time. */
nsectors_left = DIV_ROUND_UP(length, BDRV_SECTOR_SIZE) - sector_num;
n = MIN(1 << (30 - BDRV_SECTOR_BITS), nsectors_left);
ret = get_block_status(bs, sector_num, n, &next);
n = QEMU_ALIGN_DOWN(MIN(1 << 30, length - offset), BDRV_SECTOR_SIZE);
ret = get_block_status(bs, offset, n, &next);
if (ret < 0) {
error_report("Could not read file metadata: %s", strerror(-ret));