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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO | COLOPHON |
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io_uring_register_buffers(3) liburing Manualio_uring_register_buffers(3)
io_uring_register_buffers - register buffers for fixed buffer
operations
#include <liburing.h>
int io_uring_register_buffers(struct io_uring *ring,
const struct iovec *iovecs,
unsigned nr_iovecs);
int io_uring_register_buffers_sparse(struct io_uring *ring,
unsigned nr_iovecs);
The io_uring_register_buffers(3) function registers nr_iovecs
number of buffers defined by the array iovecs belonging to the
ring.
The io_uring_register_buffers_sparse(3) function registers
nr_iovecs empty buffers belonging to the ring. These buffers
must be updated before use, using eg
io_uring_register_buffers_update_tag(3).
After the caller has registered the buffers, they can be used
with one of the fixed buffers functions.
Registered buffers is an optimization that is useful in
conjunction with O_DIRECT reads and writes, where it maps the
specified range into the kernel once when the buffer is
registered rather than doing a map and unmap for each IO every
time IO is performed to that region. Additionally, it also avoids
manipulating the page reference counts for each IO.
On success io_uring_register_buffers(3) and
io_uring_register_buffers_sparse(3) return 0. On failure they
return -errno.
io_uring_get_sqe(3), io_uring_unregister_buffers(3),
io_uring_register_buf_ring(3), io_uring_prep_read_fixed(3),
io_uring_prep_write_fixed(3)
This page is part of the liburing (A library for io_uring)
project. Information about the project can be found at
⟨https://github.com/axboe/liburing⟩. If you have a bug report for
this manual page, send it to io-uring@vger.kernel.org. This page
was obtained from the project's upstream Git repository
⟨https://github.com/axboe/liburing⟩ on 2022-12-17. (At that
time, the date of the most recent commit that was found in the
repository was 2022-12-12.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
liburing-2.1 November 15, 2021io_uring_register_buffers(3)
Pages that refer to this page: io_uring_prep_read_fixed(3), io_uring_prep_write_fixed(3), io_uring_register_buffers(3), io_uring_sqe_set_flags(3), io_uring_unregister_buffers(3)
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