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block: Fix handling of image enlarging write 

Two problems exist when a write request that enlarges the image (i.e.
write beyond EOF) finishes:

1) parent is not notified about size change;
2) dirty bitmap is not resized although we try to set the dirty bits;

Fix them just like how bdrv_co_truncate works.

Reported-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Fam Zheng 2018-07-10 14:31:20 +08:00 committed by Kevin Wolf
parent 85fe24796d
commit 7f8f03ef6d
1 changed files with 7 additions and 3 deletions
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10
block/io.c
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@ -40,6 +40,7 @@
static AioWait drain_all_aio_wait;
static void bdrv_parent_cb_resize(BlockDriverState *bs);
static int coroutine_fn bdrv_co_do_pwrite_zeroes(BlockDriverState *bs,
int64_t offset, int bytes, BdrvRequestFlags flags);
@ -1621,13 +1622,16 @@ bdrv_co_write_req_finish(BdrvChild *child, int64_t offset, uint64_t bytes,
BlockDriverState *bs = child->bs;
atomic_inc(&bs->write_gen);
bdrv_set_dirty(bs, offset, bytes);
stat64_max(&bs->wr_highest_offset, offset + bytes);
if (ret == 0) {
bs->total_sectors = MAX(bs->total_sectors, end_sector);
if (ret == 0 &&
end_sector > bs->total_sectors) {
bs->total_sectors = end_sector;
bdrv_parent_cb_resize(bs);
bdrv_dirty_bitmap_truncate(bs, end_sector << BDRV_SECTOR_BITS);
}
bdrv_set_dirty(bs, offset, bytes);
}
/*