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io_uring/rsrc: don't rely on user vaddr alignment

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There is no guaranteed alignment for user pointers, however the
calculation of an offset of the first page into a folio after coalescing
uses some weird bit mask logic, get rid of it.

Cc: stable@vger.kernel.org
Reported-by: David Hildenbrand <david@redhat.com>
Fixes: a8edbb424b ("io_uring/rsrc: enable multi-hugepage buffer coalescing")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/io-uring/e387b4c78b33f231105a601d84eefd8301f57954.1750771718.git.asml.silence@gmail.com/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov
2025-06-24 14:40:34 +01:00
committed by Jens Axboe
parent 5afb4bf9fc
commit 3a3c6d6157
2 changed files with 7 additions and 1 deletions
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io_uring/rsrc.h
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@@ -49,6 +49,7 @@ struct io_imu_folio_data {
unsigned int nr_pages_mid;
unsigned int folio_shift;
unsigned int nr_folios;
unsigned long first_folio_page_idx;
};
bool io_rsrc_cache_init(struct io_ring_ctx *ctx);