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nbd/server: Fix blockstatus trace

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Don't increment remaining_bytes until we know that we will actually be
including the current block status extent in the reply; otherwise, the
value traced will include a bytes value that is oversized by the
length of the next block status extent which did not get sent because
it instead ended the loop.

Fixes: fb7afc79
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20190403030526.12258-2-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
This commit is contained in:
Eric Blake 2019-04-02 22:05:20 -05:00
parent 2c57310627
commit 2178a569be
1 changed files with 3 additions and 6 deletions
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9
nbd/server.c
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@ -1880,17 +1880,12 @@ static int blockstatus_to_extents(BlockDriverState *bs, uint64_t offset,
flags = (ret & BDRV_BLOCK_ALLOCATED ? 0 : NBD_STATE_HOLE) |
(ret & BDRV_BLOCK_ZERO ? NBD_STATE_ZERO : 0);
offset += num;
remaining_bytes -= num;
if (first_extent) {
extent->flags = flags;
extent->length = num;
first_extent = false;
continue;
}
if (flags == extent->flags) {
} else if (flags == extent->flags) {
/* extend current extent */
extent->length += num;
} else {
@ -1903,6 +1898,8 @@ static int blockstatus_to_extents(BlockDriverState *bs, uint64_t offset,
extent->flags = flags;
extent->length = num;
}
offset += num;
remaining_bytes -= num;
}
extents_end = extent + 1;