Skip to main content

Browse the archive

Revision 0007c04038e5a3111bea1c4588bfb6778a69131d authored by Linus Torvalds on 07 January 2023, 18:20:33 UTC, committed by Linus Torvalds on 07 January 2023, 18:20:33 UTC 
Merge tag 'devicetree-fixes-for-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux
 
Pull devicetree fixes from Rob Herring:

 - Fix DT memory scanning for some MIPS boards when memory is not
   specified in DT

 - Redo CONFIG_CMDLINE* handling for missing /chosen node. The first
   attempt broke PS3 (and possibly other PPC platforms).

 - Fix constraints in QCom Soundwire schema

* tag 'devicetree-fixes-for-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux:
  of: fdt: Honor CONFIG_CMDLINE* even without /chosen node, take 2
  Revert "of: fdt: Honor CONFIG_CMDLINE* even without /chosen node"
  dt-bindings: soundwire: qcom,soundwire: correct sizes related to number of ports
  of/fdt: run soc memory setup when early_init_dt_scan_memory fails
2 parent s c28bdea + 064e32d
Raw File
advise.c 
// 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;
	u32				len;
	u32				advice;
};

struct io_madvise {
	struct file			*file;
	u64				addr;
	u32				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->off || sqe->splice_fd_in)
		return -EINVAL;

	ma->addr = READ_ONCE(sqe->addr);
	ma->len = READ_ONCE(sqe->len);
	ma->advice = READ_ONCE(sqe->fadvise_advice);
	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;

	if (issue_flags & IO_URING_F_NONBLOCK)
		return -EAGAIN;

	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
	io_req_set_res(req, ret, 0);
	return IOU_OK;
#else
	return -EOPNOTSUPP;
#endif
}

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->addr || sqe->splice_fd_in)
		return -EINVAL;

	fa->offset = READ_ONCE(sqe->off);
	fa->len = READ_ONCE(sqe->len);
	fa->advice = READ_ONCE(sqe->fadvise_advice);
	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;

	if (issue_flags & IO_URING_F_NONBLOCK) {
		switch (fa->advice) {
		case POSIX_FADV_NORMAL:
		case POSIX_FADV_RANDOM:
		case POSIX_FADV_SEQUENTIAL:
			break;
		default:
			return -EAGAIN;
		}
	}

	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_OK;
}
back to top