io_uring: add infra for importing vectored reg buffers

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Add io_import_reg_vec(), which will be responsible for importing
vectored registered buffers. The function might reallocate the vector,
but it'd try to do the conversion in place first, which is why it's
required of the user to pad the iovec to the right border of the cache.

Overlapping also depends on struct iovec being larger than bvec, which
is not the case on e.g. 32 bit architectures. Don't try to complicate
this case and make sure vectors never overlap, it'll be improved later.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/60bd246b1249476a6996407c1dbc38ef6febad14.1741362889.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Pavel Begunkov 2025-03-07 16:00:30 +00:00 • committed by Jens Axboe

parent e1d4995909

commit 9ef4cbbcb4

3 changed files with 138 additions and 2 deletions

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5

include/linux/io_uring_types.h

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128

io_uring/rsrc.c

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5

io_uring/rsrc.h

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