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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109// SPDX-License-Identifier: GPL-2.0#include <linux/kernel.h>#include <linux/errno.h>#include <linux/fs.h>#include <linux/file.h>#include <linux/mm.h>#include <linux/slab.h>#include <linux/namei.h>#include <linux/io_uring.h>
#include <uapi/linux/fadvise.h>#include <uapi/linux/io_uring.h>
#include "io_uring.h"#include "advise.h"
struct io_fadvise { struct file *file; u64 offset; u64 len; u32 advice;};
struct io_madvise { struct file *file; u64 addr; u64 len; u32 advice;};
int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe){#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise);
if (sqe->buf_index || sqe->splice_fd_in) return -EINVAL;
ma->addr = READ_ONCE(sqe->addr); ma->len = READ_ONCE(sqe->off); if (!ma->len) ma->len = READ_ONCE(sqe->len); ma->advice = READ_ONCE(sqe->fadvise_advice); req->flags |= REQ_F_FORCE_ASYNC; return 0;#else return -EOPNOTSUPP;#endif}
int io_madvise(struct io_kiocb *req, unsigned int issue_flags){#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU) struct io_madvise *ma = io_kiocb_to_cmd(req, struct io_madvise); int ret;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);
ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice); io_req_set_res(req, ret, 0); return IOU_COMPLETE;#else return -EOPNOTSUPP;#endif}
static bool io_fadvise_force_async(struct io_fadvise *fa){ switch (fa->advice) { case POSIX_FADV_NORMAL: case POSIX_FADV_RANDOM: case POSIX_FADV_SEQUENTIAL: return false; default: return true; }}
int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe){ struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise);
if (sqe->buf_index || sqe->splice_fd_in) return -EINVAL;
fa->offset = READ_ONCE(sqe->off); fa->len = READ_ONCE(sqe->addr); if (!fa->len) fa->len = READ_ONCE(sqe->len); fa->advice = READ_ONCE(sqe->fadvise_advice); if (io_fadvise_force_async(fa)) req->flags |= REQ_F_FORCE_ASYNC; return 0;}
int io_fadvise(struct io_kiocb *req, unsigned int issue_flags){ struct io_fadvise *fa = io_kiocb_to_cmd(req, struct io_fadvise); int ret;
WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK && io_fadvise_force_async(fa));
ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice); if (ret < 0) req_set_fail(req); io_req_set_res(req, ret, 0); return IOU_COMPLETE;}