io_uring_prep_fallocate(3) liburing Manual io_uring_prep_fallocate(3)

io_uring_prep_fallocate - prepare a fallocate request

#include <fcntl.h>
#include <liburing.h>
void io_uring_prep_fallocate(struct io_uring_sqe *sqe,
                             int fd,
                             int mode,
                             __u64 offset,
                             __u64 len);

The io_uring_prep_fallocate(3) function prepares a fallocate request. The submission queue entry sqe is setup to use the file descriptor pointed to by fd to start a fallocate operation described by mode at offset offset and len length in bytes.

This function prepares an async fallocate(2) request. See that man page for details.


The CQE res 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 -1 on failure and set errno to the actual error value, io_uring never uses errno. Instead it returns the negated errno directly in the CQE res field.

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

March 13, 2022 liburing-2.2