On 08/08/2018 05:13 PM, Alberto Garcia wrote:
On Wed 08 Aug 2018 09:10:49 AM CEST, Leonid Bloch wrote:
The caches are now recalculated upon image resizing. This is done
because the new default behavior of assigning a sufficient L2 cache to
cover the entire image implies that the cache will still be sufficient
after an image resizing.
This is related to what I mentioned in the previous patch. The default
behavior doesn't make the cache try to cover the entire image (or at
least it doesn't *extend* the cache, which is what I understand from
this paragraph). What it does is *reduce* the cache if the smaller
version is enough for the entire image.
But it doesn't say that it extends the cache. It says that it *adapts*
the cache to the image size, and therefore it should be resized when the
image is resized. At least I understand it this way. That said, I'd
mention the limit there, instead of just "sufficient".
Signed-off-by: Leonid Bloch <lbl...@janustech.com>
---
block/qcow2.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/block/qcow2.c b/block/qcow2.c
index 98cb96aaca..f60cb92169 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -3639,6 +3639,8 @@ static int coroutine_fn
qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
}
}
+ bs->total_sectors = offset / BDRV_SECTOR_SIZE;
+
/* write updated header.size */
offset = cpu_to_be64(offset);
ret = bdrv_pwrite_sync(bs->file, offsetof(QCowHeader, size),
@@ -3649,6 +3651,12 @@ static int coroutine_fn
qcow2_co_truncate(BlockDriverState *bs, int64_t offset,
}
s->l1_vm_state_index = new_l1_size;
You could add an empty line here for readability.
Yes, definitely, I will. Thanks.
+ /* Update cache sizes */
+ QDict *options = qdict_clone_shallow(bs->options);
C99 allows variable declarations in the middle of a block, but we're
still doing it at the beginning (I don't know if there's a good reason
for this?).
I did it for readability, and I didn't see a style directive for this.
But if the style requires it - no problem. :)
Otherwise the patch looks good to me. Thanks!
Thanks!
Leonid.
Berto
