Re: [PATCH v3 3/3] btrfs: drop unnecessary ASSERT from btrfs_submit_direct()

On Wed, Jul 21, 2021 at 09:43:34PM +0900, Naohiro Aota wrote:

When on SINGLE block group, btrfs_get_io_geometry() will return "the
size of the block group - the offset of the logical address within the
block group" as geom.len. Since we allow up to 8 GB zone size on zoned
btrfs, we can have up to 8 GB block group, so can have up to 8 GB
geom.len. With this setup, we easily hit the "ASSERT(geom.len <=
INT_MAX);".

The ASSERT looks like to guard btrfs_bio_clone_partial() and bio_trim()
which both take "int" (now "unsigned int" with the previous patch). So to

                              ^^^^^^^^^^^^

That is now u64, fixed in the case below too.

be precise the ASSERT should check if clone_len <= UINT_MAX. But
actually, clone_len is already capped by bio.bi_iter.bi_size which is
unsigned int. So the ASSERT is not necessary.

Drop the ASSERT and properly compare submit_len and geom.len in u64. Then,
let the implicit casting to convert it to unsigned int.

                                            ^^^^^^^^^^^^

As it's fixing the 8GB zone case I'd like to put the series to -rc
queue. There are the two block layer patches, reviewed by Christoph but
I'll wait a bit for acks before sending it to Linus. Meanwhile I'll add
it to for-next for testing. Thanks.