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remove the raw driver
The raw driver used to provide direct unbuffered access to block devices before O_DIRECT was invented. It has been obsolete for more than a decade. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/lkml/Pine.LNX.4.64.0703180754060.6605@CPE00045a9c397f-CM001225dbafb6/ Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210531072526.97052-1-hch@lst.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christoph Hellwig
Greg Kroah-Hartman
parent
39ee156c5a
commit
603e4922f1
@ -357,27 +357,6 @@ config NVRAM
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To compile this driver as a module, choose M here: the
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module will be called nvram.
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config RAW_DRIVER
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tristate "RAW driver (/dev/raw/rawN)"
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depends on BLOCK
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help
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The raw driver permits block devices to be bound to /dev/raw/rawN.
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Once bound, I/O against /dev/raw/rawN uses efficient zero-copy I/O.
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See the raw(8) manpage for more details.
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Applications should preferably open the device (eg /dev/hda1)
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with the O_DIRECT flag.
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config MAX_RAW_DEVS
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int "Maximum number of RAW devices to support (1-65536)"
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depends on RAW_DRIVER
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range 1 65536
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default "256"
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help
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The maximum number of RAW devices that are supported.
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Default is 256. Increase this number in case you need lots of
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raw devices.
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config DEVPORT
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bool "/dev/port character device"
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depends on ISA || PCI
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@ -8,7 +8,6 @@ obj-$(CONFIG_TTY_PRINTK) += ttyprintk.o
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obj-y += misc.o
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obj-$(CONFIG_ATARI_DSP56K) += dsp56k.o
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obj-$(CONFIG_VIRTIO_CONSOLE) += virtio_console.o
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obj-$(CONFIG_RAW_DRIVER) += raw.o
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obj-$(CONFIG_MSPEC) += mspec.o
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obj-$(CONFIG_UV_MMTIMER) += uv_mmtimer.o
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obj-$(CONFIG_IBM_BSR) += bsr.o
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@ -16,7 +16,6 @@
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#include <linux/mman.h>
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#include <linux/random.h>
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#include <linux/init.h>
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#include <linux/raw.h>
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#include <linux/tty.h>
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#include <linux/capability.h>
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#include <linux/ptrace.h>
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@ -1,362 +0,0 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/drivers/char/raw.c
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*
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* Front-end raw character devices. These can be bound to any block
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* devices to provide genuine Unix raw character device semantics.
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*
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* We reserve minor number 0 for a control interface. ioctl()s on this
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* device are used to bind the other minor numbers to block devices.
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*/
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/major.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/module.h>
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#include <linux/raw.h>
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#include <linux/capability.h>
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#include <linux/uio.h>
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#include <linux/cdev.h>
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#include <linux/device.h>
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#include <linux/mutex.h>
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#include <linux/gfp.h>
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#include <linux/compat.h>
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#include <linux/vmalloc.h>
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#include <linux/uaccess.h>
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struct raw_device_data {
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dev_t binding;
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struct block_device *bdev;
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int inuse;
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};
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static struct class *raw_class;
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static struct raw_device_data *raw_devices;
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static DEFINE_MUTEX(raw_mutex);
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static const struct file_operations raw_ctl_fops; /* forward declaration */
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static int max_raw_minors = CONFIG_MAX_RAW_DEVS;
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module_param(max_raw_minors, int, 0);
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MODULE_PARM_DESC(max_raw_minors, "Maximum number of raw devices (1-65536)");
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/*
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* Open/close code for raw IO.
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*
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* We just rewrite the i_mapping for the /dev/raw/rawN file descriptor to
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* point at the blockdev's address_space and set the file handle to use
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* O_DIRECT.
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*
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* Set the device's soft blocksize to the minimum possible. This gives the
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* finest possible alignment and has no adverse impact on performance.
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*/
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static int raw_open(struct inode *inode, struct file *filp)
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{
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const int minor = iminor(inode);
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struct block_device *bdev;
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int err;
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if (minor == 0) { /* It is the control device */
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filp->f_op = &raw_ctl_fops;
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return 0;
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}
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pr_warn_ratelimited(
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"process %s (pid %d) is using the deprecated raw device\n"
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"support will be removed in Linux 5.14.\n",
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current->comm, current->pid);
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mutex_lock(&raw_mutex);
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/*
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* All we need to do on open is check that the device is bound.
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*/
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err = -ENODEV;
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if (!raw_devices[minor].binding)
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goto out;
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bdev = blkdev_get_by_dev(raw_devices[minor].binding,
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filp->f_mode | FMODE_EXCL, raw_open);
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if (IS_ERR(bdev)) {
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err = PTR_ERR(bdev);
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goto out;
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}
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err = set_blocksize(bdev, bdev_logical_block_size(bdev));
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if (err)
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goto out1;
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filp->f_flags |= O_DIRECT;
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filp->f_mapping = bdev->bd_inode->i_mapping;
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if (++raw_devices[minor].inuse == 1)
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file_inode(filp)->i_mapping =
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bdev->bd_inode->i_mapping;
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filp->private_data = bdev;
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raw_devices[minor].bdev = bdev;
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mutex_unlock(&raw_mutex);
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return 0;
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out1:
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blkdev_put(bdev, filp->f_mode | FMODE_EXCL);
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out:
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mutex_unlock(&raw_mutex);
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return err;
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}
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/*
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* When the final fd which refers to this character-special node is closed, we
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* make its ->mapping point back at its own i_data.
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*/
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static int raw_release(struct inode *inode, struct file *filp)
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{
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const int minor= iminor(inode);
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struct block_device *bdev;
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mutex_lock(&raw_mutex);
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bdev = raw_devices[minor].bdev;
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if (--raw_devices[minor].inuse == 0)
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/* Here inode->i_mapping == bdev->bd_inode->i_mapping */
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inode->i_mapping = &inode->i_data;
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mutex_unlock(&raw_mutex);
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blkdev_put(bdev, filp->f_mode | FMODE_EXCL);
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return 0;
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}
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/*
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* Forward ioctls to the underlying block device.
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*/
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static long
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raw_ioctl(struct file *filp, unsigned int command, unsigned long arg)
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{
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struct block_device *bdev = filp->private_data;
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return blkdev_ioctl(bdev, 0, command, arg);
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}
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static int bind_set(int number, u64 major, u64 minor)
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{
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dev_t dev = MKDEV(major, minor);
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dev_t raw = MKDEV(RAW_MAJOR, number);
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struct raw_device_data *rawdev;
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int err = 0;
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if (number <= 0 || number >= max_raw_minors)
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return -EINVAL;
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if (MAJOR(dev) != major || MINOR(dev) != minor)
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return -EINVAL;
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rawdev = &raw_devices[number];
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/*
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* This is like making block devices, so demand the
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* same capability
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*/
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if (!capable(CAP_SYS_ADMIN))
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return -EPERM;
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/*
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* For now, we don't need to check that the underlying
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* block device is present or not: we can do that when
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* the raw device is opened. Just check that the
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* major/minor numbers make sense.
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*/
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if (MAJOR(dev) == 0 && dev != 0)
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return -EINVAL;
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mutex_lock(&raw_mutex);
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if (rawdev->inuse) {
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mutex_unlock(&raw_mutex);
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return -EBUSY;
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}
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if (rawdev->binding)
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module_put(THIS_MODULE);
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rawdev->binding = dev;
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if (!dev) {
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/* unbind */
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device_destroy(raw_class, raw);
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} else {
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__module_get(THIS_MODULE);
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device_destroy(raw_class, raw);
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device_create(raw_class, NULL, raw, NULL, "raw%d", number);
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}
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mutex_unlock(&raw_mutex);
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return err;
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}
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static int bind_get(int number, dev_t *dev)
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{
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if (number <= 0 || number >= max_raw_minors)
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return -EINVAL;
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*dev = raw_devices[number].binding;
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return 0;
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}
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/*
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* Deal with ioctls against the raw-device control interface, to bind
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* and unbind other raw devices.
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*/
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static long raw_ctl_ioctl(struct file *filp, unsigned int command,
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unsigned long arg)
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{
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struct raw_config_request rq;
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dev_t dev;
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int err;
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switch (command) {
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case RAW_SETBIND:
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if (copy_from_user(&rq, (void __user *) arg, sizeof(rq)))
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return -EFAULT;
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return bind_set(rq.raw_minor, rq.block_major, rq.block_minor);
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case RAW_GETBIND:
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if (copy_from_user(&rq, (void __user *) arg, sizeof(rq)))
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return -EFAULT;
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err = bind_get(rq.raw_minor, &dev);
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if (err)
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return err;
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rq.block_major = MAJOR(dev);
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rq.block_minor = MINOR(dev);
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if (copy_to_user((void __user *)arg, &rq, sizeof(rq)))
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return -EFAULT;
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return 0;
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}
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return -EINVAL;
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}
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#ifdef CONFIG_COMPAT
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struct raw32_config_request {
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compat_int_t raw_minor;
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compat_u64 block_major;
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compat_u64 block_minor;
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};
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static long raw_ctl_compat_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct raw32_config_request __user *user_req = compat_ptr(arg);
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struct raw32_config_request rq;
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dev_t dev;
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int err = 0;
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switch (cmd) {
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case RAW_SETBIND:
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if (copy_from_user(&rq, user_req, sizeof(rq)))
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return -EFAULT;
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return bind_set(rq.raw_minor, rq.block_major, rq.block_minor);
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case RAW_GETBIND:
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if (copy_from_user(&rq, user_req, sizeof(rq)))
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return -EFAULT;
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err = bind_get(rq.raw_minor, &dev);
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if (err)
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return err;
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rq.block_major = MAJOR(dev);
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rq.block_minor = MINOR(dev);
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if (copy_to_user(user_req, &rq, sizeof(rq)))
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return -EFAULT;
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return 0;
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}
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return -EINVAL;
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}
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#endif
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static const struct file_operations raw_fops = {
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.read_iter = blkdev_read_iter,
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.write_iter = blkdev_write_iter,
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.fsync = blkdev_fsync,
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.open = raw_open,
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.release = raw_release,
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.unlocked_ioctl = raw_ioctl,
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.llseek = default_llseek,
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.owner = THIS_MODULE,
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};
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static const struct file_operations raw_ctl_fops = {
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.unlocked_ioctl = raw_ctl_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = raw_ctl_compat_ioctl,
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#endif
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.open = raw_open,
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.owner = THIS_MODULE,
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.llseek = noop_llseek,
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};
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static struct cdev raw_cdev;
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static char *raw_devnode(struct device *dev, umode_t *mode)
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{
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return kasprintf(GFP_KERNEL, "raw/%s", dev_name(dev));
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}
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static int __init raw_init(void)
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{
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dev_t dev = MKDEV(RAW_MAJOR, 0);
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int ret;
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if (max_raw_minors < 1 || max_raw_minors > 65536) {
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pr_warn("raw: invalid max_raw_minors (must be between 1 and 65536), using %d\n",
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CONFIG_MAX_RAW_DEVS);
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max_raw_minors = CONFIG_MAX_RAW_DEVS;
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}
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raw_devices = vzalloc(array_size(max_raw_minors,
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sizeof(struct raw_device_data)));
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if (!raw_devices) {
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printk(KERN_ERR "Not enough memory for raw device structures\n");
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ret = -ENOMEM;
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goto error;
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}
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ret = register_chrdev_region(dev, max_raw_minors, "raw");
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if (ret)
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goto error;
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cdev_init(&raw_cdev, &raw_fops);
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ret = cdev_add(&raw_cdev, dev, max_raw_minors);
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if (ret)
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goto error_region;
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raw_class = class_create(THIS_MODULE, "raw");
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if (IS_ERR(raw_class)) {
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printk(KERN_ERR "Error creating raw class.\n");
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cdev_del(&raw_cdev);
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ret = PTR_ERR(raw_class);
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goto error_region;
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}
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raw_class->devnode = raw_devnode;
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device_create(raw_class, NULL, MKDEV(RAW_MAJOR, 0), NULL, "rawctl");
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return 0;
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error_region:
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unregister_chrdev_region(dev, max_raw_minors);
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error:
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vfree(raw_devices);
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return ret;
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}
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static void __exit raw_exit(void)
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{
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device_destroy(raw_class, MKDEV(RAW_MAJOR, 0));
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class_destroy(raw_class);
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cdev_del(&raw_cdev);
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unregister_chrdev_region(MKDEV(RAW_MAJOR, 0), max_raw_minors);
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}
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module_init(raw_init);
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module_exit(raw_exit);
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MODULE_LICENSE("GPL");
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@ -1669,7 +1669,7 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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* Does not take i_mutex for the write and thus is not for general purpose
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* use.
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*/
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ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
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static ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
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{
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struct file *file = iocb->ki_filp;
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struct inode *bd_inode = bdev_file_inode(file);
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@ -1707,9 +1707,8 @@ ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from)
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blk_finish_plug(&plug);
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return ret;
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}
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EXPORT_SYMBOL_GPL(blkdev_write_iter);
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|
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ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
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static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
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{
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struct file *file = iocb->ki_filp;
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struct inode *bd_inode = bdev_file_inode(file);
|
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@ -1731,7 +1730,6 @@ ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
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iov_iter_reexpand(to, iov_iter_count(to) + shorted);
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return ret;
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}
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EXPORT_SYMBOL_GPL(blkdev_read_iter);
|
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|
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/*
|
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* Try to release a page associated with block device when the system
|
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|
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@ -3242,11 +3242,8 @@ ssize_t vfs_iocb_iter_write(struct file *file, struct kiocb *iocb,
|
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struct iov_iter *iter);
|
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|
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/* fs/block_dev.c */
|
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extern ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to);
|
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extern ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from);
|
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extern int blkdev_fsync(struct file *filp, loff_t start, loff_t end,
|
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int datasync);
|
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extern void block_sync_page(struct page *page);
|
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|
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/* fs/splice.c */
|
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extern ssize_t generic_file_splice_read(struct file *, loff_t *,
|
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|
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@ -1,17 +0,0 @@
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
|
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#ifndef __LINUX_RAW_H
|
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#define __LINUX_RAW_H
|
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|
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#include <linux/types.h>
|
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|
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#define RAW_SETBIND _IO( 0xac, 0 )
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#define RAW_GETBIND _IO( 0xac, 1 )
|
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|
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struct raw_config_request
|
||||
{
|
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int raw_minor;
|
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__u64 block_major;
|
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__u64 block_minor;
|
||||
};
|
||||
|
||||
#endif /* __LINUX_RAW_H */
|
||||
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Reference in New Issue
Block a user