block: improve aligning down bios in bio_iov_iter_bounce_write

Sashiko complained about bio_iov_iter_align_down potentially dropping
bvecs, and thus losing bounce folios.  While losing bio_vecs is real,
bio_iov_iter_bounce_write allocates all segments and thus the entire bio
in multiples of the minsize, thus making the rounding down redundant.

Replace it with a safety rounding down of this_len in case something odd
happens to the greedy folio allocation helper.

Fixes: e7b8b3c5b2a6 ("block: align down bounces bios")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <mkp@kernel.org>
Link: https://patch.msgid.link/20260907074111.721054-4-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

0 files changed, 0 insertions, 0 deletions