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Christoph Hellwig
df308a1458
bio_iov_iter_align_down expects the "normal" biovec layout from vector 0,
while bio_iov_iter_bounce_read abuses vector 0 for a bounce buffer
allocation. Pass an explicit bvec to bio_iov_iter_align_down to deal
with this case to avoid a double unpin.
Additionally we need to free the folio if no bio_vec could be added,
and adjust the size of the first bio_vec that contains the bounce buffer
when the I/O size is aligned down.
Fixes: e7b8b3c5b2 ("block: align down bounces bios")
Reported-by: 0wnerD1ed <[email protected]>
Signed-off-by: Christoph Hellwig <[email protected]>
Tested-by: 0wnerD1ed <[email protected]>
Reviewed-by: Keith Busch <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jens Axboe <[email protected]>