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io_uring_prep_fallocate(3) — Linux manual page

io_uring_prep_fallocate(3)   liburing Manualio_uring_prep_fallocate(3)

NAME        top

       io_uring_prep_fallocate - prepare a fallocate request

SYNOPSIS        top

#include <fcntl.h>#include <liburing.h>void io_uring_prep_fallocate(struct io_uring_sqe *sqe,intfd,intmode,__u64offset,__u64len);

DESCRIPTION        top

       Theio_uring_prep_fallocate(3) function prepares a fallocate       request. The submission queue entrysqe is setup to use the file       descriptor pointed to byfd to start a fallocate operation       described bymode at offsetoffset andlen length in bytes.       This function prepares an asyncfallocate(2) request. See that man       page for details.

RETURN VALUE        top

       None

ERRORS        top

       The CQEres field will contain the result of the operation. See       the related man page for details on possible values. Note that       where synchronous system calls will return-1on failure and seterrno to the actual error value, io_uring never useserrno.       Instead it returns the negatederrno directly in the CQEres       field.

SEE ALSO        top

io_uring_get_sqe(3),io_uring_submit(3),fallocate(2)

COLOPHON        top

       This page is part of theliburing (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 2025-08-11.  (At that time,       the date of the most recent commit that was found in the       repository was 2025-08-02.)  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 isnot part of the original manual page), send a mail to       man-pages@man7.orgliburing-2.2                  March 13, 2022io_uring_prep_fallocate(3)

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