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6732932c83
Use the new blk_rq_map_user_io helper instead of duplicating code at various places. Additionally this also takes advantage of the on-stack iov fast path. Signed-off-by: Anuj Gupta <anuj20.g@samsung.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20220930062749.152261-5-anuj20.g@samsung.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
958 lines
23 KiB
C
958 lines
23 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Changes:
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* Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000
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* - get rid of some verify_areas and use __copy*user and __get/put_user
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* for the ones that remain
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*/
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#include <linux/module.h>
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#include <linux/blkdev.h>
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#include <linux/interrupt.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/cdrom.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi_device.h>
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#include <scsi/scsi_eh.h>
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#include <scsi/scsi_host.h>
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#include <scsi/scsi_ioctl.h>
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#include <scsi/sg.h>
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#include <scsi/scsi_dbg.h>
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#include "scsi_logging.h"
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#define NORMAL_RETRIES 5
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#define IOCTL_NORMAL_TIMEOUT (10 * HZ)
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#define MAX_BUF PAGE_SIZE
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/**
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* ioctl_probe -- return host identification
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* @host: host to identify
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* @buffer: userspace buffer for identification
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*
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* Return an identifying string at @buffer, if @buffer is non-NULL, filling
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* to the length stored at * (int *) @buffer.
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*/
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static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
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{
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unsigned int len, slen;
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const char *string;
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if (buffer) {
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if (get_user(len, (unsigned int __user *) buffer))
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return -EFAULT;
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if (host->hostt->info)
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string = host->hostt->info(host);
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else
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string = host->hostt->name;
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if (string) {
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slen = strlen(string);
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if (len > slen)
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len = slen + 1;
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if (copy_to_user(buffer, string, len))
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return -EFAULT;
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}
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}
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return 1;
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}
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static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
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int timeout, int retries)
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{
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int result;
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struct scsi_sense_hdr sshdr;
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SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev,
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"Trying ioctl with scsi command %d\n", *cmd));
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result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
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&sshdr, timeout, retries, NULL);
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SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
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"Ioctl returned 0x%x\n", result));
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if (result < 0)
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goto out;
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if (scsi_sense_valid(&sshdr)) {
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switch (sshdr.sense_key) {
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case ILLEGAL_REQUEST:
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if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
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sdev->lockable = 0;
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else
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sdev_printk(KERN_INFO, sdev,
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"ioctl_internal_command: "
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"ILLEGAL REQUEST "
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"asc=0x%x ascq=0x%x\n",
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sshdr.asc, sshdr.ascq);
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break;
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case NOT_READY: /* This happens if there is no disc in drive */
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if (sdev->removable)
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break;
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fallthrough;
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case UNIT_ATTENTION:
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if (sdev->removable) {
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sdev->changed = 1;
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result = 0; /* This is no longer considered an error */
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break;
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}
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fallthrough; /* for non-removable media */
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default:
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sdev_printk(KERN_INFO, sdev,
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"ioctl_internal_command return code = %x\n",
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result);
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scsi_print_sense_hdr(sdev, NULL, &sshdr);
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break;
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}
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}
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out:
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SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
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"IOCTL Releasing command\n"));
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return result;
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}
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int scsi_set_medium_removal(struct scsi_device *sdev, char state)
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{
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char scsi_cmd[MAX_COMMAND_SIZE];
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int ret;
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if (!sdev->removable || !sdev->lockable)
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return 0;
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scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
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scsi_cmd[1] = 0;
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scsi_cmd[2] = 0;
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scsi_cmd[3] = 0;
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scsi_cmd[4] = state;
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scsi_cmd[5] = 0;
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ret = ioctl_internal_command(sdev, scsi_cmd,
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IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
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if (ret == 0)
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sdev->locked = (state == SCSI_REMOVAL_PREVENT);
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return ret;
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}
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EXPORT_SYMBOL(scsi_set_medium_removal);
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/*
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* The scsi_ioctl_get_pci() function places into arg the value
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* pci_dev::slot_name (8 characters) for the PCI device (if any).
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* Returns: 0 on success
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* -ENXIO if there isn't a PCI device pointer
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* (could be because the SCSI driver hasn't been
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* updated yet, or because it isn't a SCSI
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* device)
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* any copy_to_user() error on failure there
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*/
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static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
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{
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struct device *dev = scsi_get_device(sdev->host);
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const char *name;
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if (!dev)
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return -ENXIO;
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name = dev_name(dev);
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/* compatibility with old ioctl which only returned
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* 20 characters */
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return copy_to_user(arg, name, min(strlen(name), (size_t)20))
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? -EFAULT: 0;
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}
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static int sg_get_version(int __user *p)
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{
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static const int sg_version_num = 30527;
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return put_user(sg_version_num, p);
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}
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static int sg_set_timeout(struct scsi_device *sdev, int __user *p)
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{
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int timeout, err = get_user(timeout, p);
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if (!err)
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sdev->sg_timeout = clock_t_to_jiffies(timeout);
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return err;
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}
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static int sg_get_reserved_size(struct scsi_device *sdev, int __user *p)
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{
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int val = min(sdev->sg_reserved_size,
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queue_max_bytes(sdev->request_queue));
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return put_user(val, p);
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}
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static int sg_set_reserved_size(struct scsi_device *sdev, int __user *p)
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{
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int size, err = get_user(size, p);
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if (err)
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return err;
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if (size < 0)
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return -EINVAL;
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sdev->sg_reserved_size = min_t(unsigned int, size,
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queue_max_bytes(sdev->request_queue));
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return 0;
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}
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/*
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* will always return that we are ATAPI even for a real SCSI drive, I'm not
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* so sure this is worth doing anything about (why would you care??)
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*/
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static int sg_emulated_host(struct request_queue *q, int __user *p)
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{
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return put_user(1, p);
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}
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static int scsi_get_idlun(struct scsi_device *sdev, void __user *argp)
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{
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struct scsi_idlun v = {
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.dev_id = (sdev->id & 0xff) +
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((sdev->lun & 0xff) << 8) +
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((sdev->channel & 0xff) << 16) +
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((sdev->host->host_no & 0xff) << 24),
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.host_unique_id = sdev->host->unique_id
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};
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if (copy_to_user(argp, &v, sizeof(struct scsi_idlun)))
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return -EFAULT;
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return 0;
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}
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static int scsi_send_start_stop(struct scsi_device *sdev, int data)
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{
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u8 cdb[MAX_COMMAND_SIZE] = { };
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cdb[0] = START_STOP;
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cdb[4] = data;
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return ioctl_internal_command(sdev, cdb, START_STOP_TIMEOUT,
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NORMAL_RETRIES);
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}
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/*
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* Check if the given command is allowed.
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*
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* Only a subset of commands are allowed for unprivileged users. Commands used
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* to format the media, update the firmware, etc. are not permitted.
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*/
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bool scsi_cmd_allowed(unsigned char *cmd, fmode_t mode)
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{
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/* root can do any command. */
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if (capable(CAP_SYS_RAWIO))
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return true;
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/* Anybody who can open the device can do a read-safe command */
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switch (cmd[0]) {
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/* Basic read-only commands */
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case TEST_UNIT_READY:
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case REQUEST_SENSE:
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case READ_6:
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case READ_10:
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case READ_12:
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case READ_16:
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case READ_BUFFER:
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case READ_DEFECT_DATA:
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case READ_CAPACITY: /* also GPCMD_READ_CDVD_CAPACITY */
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case READ_LONG:
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case INQUIRY:
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case MODE_SENSE:
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case MODE_SENSE_10:
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case LOG_SENSE:
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case START_STOP:
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case GPCMD_VERIFY_10:
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case VERIFY_16:
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case REPORT_LUNS:
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case SERVICE_ACTION_IN_16:
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case RECEIVE_DIAGNOSTIC:
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case MAINTENANCE_IN: /* also GPCMD_SEND_KEY, which is a write command */
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case GPCMD_READ_BUFFER_CAPACITY:
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/* Audio CD commands */
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case GPCMD_PLAY_CD:
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case GPCMD_PLAY_AUDIO_10:
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case GPCMD_PLAY_AUDIO_MSF:
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case GPCMD_PLAY_AUDIO_TI:
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case GPCMD_PAUSE_RESUME:
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/* CD/DVD data reading */
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case GPCMD_READ_CD:
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case GPCMD_READ_CD_MSF:
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case GPCMD_READ_DISC_INFO:
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case GPCMD_READ_DVD_STRUCTURE:
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case GPCMD_READ_HEADER:
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case GPCMD_READ_TRACK_RZONE_INFO:
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case GPCMD_READ_SUBCHANNEL:
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case GPCMD_READ_TOC_PMA_ATIP:
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case GPCMD_REPORT_KEY:
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case GPCMD_SCAN:
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case GPCMD_GET_CONFIGURATION:
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case GPCMD_READ_FORMAT_CAPACITIES:
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case GPCMD_GET_EVENT_STATUS_NOTIFICATION:
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case GPCMD_GET_PERFORMANCE:
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case GPCMD_SEEK:
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case GPCMD_STOP_PLAY_SCAN:
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/* ZBC */
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case ZBC_IN:
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return true;
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/* Basic writing commands */
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case WRITE_6:
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case WRITE_10:
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case WRITE_VERIFY:
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case WRITE_12:
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case WRITE_VERIFY_12:
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case WRITE_16:
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case WRITE_LONG:
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case WRITE_LONG_2:
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case WRITE_SAME:
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case WRITE_SAME_16:
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case WRITE_SAME_32:
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case ERASE:
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case GPCMD_MODE_SELECT_10:
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case MODE_SELECT:
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case LOG_SELECT:
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case GPCMD_BLANK:
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case GPCMD_CLOSE_TRACK:
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case GPCMD_FLUSH_CACHE:
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case GPCMD_FORMAT_UNIT:
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case GPCMD_REPAIR_RZONE_TRACK:
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case GPCMD_RESERVE_RZONE_TRACK:
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case GPCMD_SEND_DVD_STRUCTURE:
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case GPCMD_SEND_EVENT:
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case GPCMD_SEND_OPC:
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case GPCMD_SEND_CUE_SHEET:
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case GPCMD_SET_SPEED:
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case GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
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case GPCMD_LOAD_UNLOAD:
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case GPCMD_SET_STREAMING:
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case GPCMD_SET_READ_AHEAD:
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/* ZBC */
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case ZBC_OUT:
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return (mode & FMODE_WRITE);
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default:
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return false;
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}
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}
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EXPORT_SYMBOL(scsi_cmd_allowed);
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static int scsi_fill_sghdr_rq(struct scsi_device *sdev, struct request *rq,
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struct sg_io_hdr *hdr, fmode_t mode)
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{
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struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
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if (hdr->cmd_len < 6)
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return -EMSGSIZE;
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if (copy_from_user(scmd->cmnd, hdr->cmdp, hdr->cmd_len))
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return -EFAULT;
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if (!scsi_cmd_allowed(scmd->cmnd, mode))
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return -EPERM;
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scmd->cmd_len = hdr->cmd_len;
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rq->timeout = msecs_to_jiffies(hdr->timeout);
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if (!rq->timeout)
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rq->timeout = sdev->sg_timeout;
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if (!rq->timeout)
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rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
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if (rq->timeout < BLK_MIN_SG_TIMEOUT)
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rq->timeout = BLK_MIN_SG_TIMEOUT;
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return 0;
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}
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static int scsi_complete_sghdr_rq(struct request *rq, struct sg_io_hdr *hdr,
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struct bio *bio)
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{
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struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(rq);
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int r, ret = 0;
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/*
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* fill in all the output members
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*/
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hdr->status = scmd->result & 0xff;
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hdr->masked_status = status_byte(scmd->result);
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hdr->msg_status = COMMAND_COMPLETE;
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hdr->host_status = host_byte(scmd->result);
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hdr->driver_status = 0;
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if (scsi_status_is_check_condition(hdr->status))
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hdr->driver_status = DRIVER_SENSE;
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hdr->info = 0;
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if (hdr->masked_status || hdr->host_status || hdr->driver_status)
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hdr->info |= SG_INFO_CHECK;
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hdr->resid = scmd->resid_len;
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hdr->sb_len_wr = 0;
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if (scmd->sense_len && hdr->sbp) {
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int len = min((unsigned int) hdr->mx_sb_len, scmd->sense_len);
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if (!copy_to_user(hdr->sbp, scmd->sense_buffer, len))
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hdr->sb_len_wr = len;
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else
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ret = -EFAULT;
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}
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r = blk_rq_unmap_user(bio);
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if (!ret)
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ret = r;
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return ret;
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}
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static int sg_io(struct scsi_device *sdev, struct sg_io_hdr *hdr, fmode_t mode)
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{
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unsigned long start_time;
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ssize_t ret = 0;
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int writing = 0;
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int at_head = 0;
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struct request *rq;
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struct scsi_cmnd *scmd;
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struct bio *bio;
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if (hdr->interface_id != 'S')
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return -EINVAL;
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if (hdr->dxfer_len > (queue_max_hw_sectors(sdev->request_queue) << 9))
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return -EIO;
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if (hdr->dxfer_len)
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switch (hdr->dxfer_direction) {
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default:
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return -EINVAL;
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case SG_DXFER_TO_DEV:
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writing = 1;
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break;
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case SG_DXFER_TO_FROM_DEV:
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case SG_DXFER_FROM_DEV:
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break;
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}
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if (hdr->flags & SG_FLAG_Q_AT_HEAD)
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at_head = 1;
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rq = scsi_alloc_request(sdev->request_queue, writing ?
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REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
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if (IS_ERR(rq))
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return PTR_ERR(rq);
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scmd = blk_mq_rq_to_pdu(rq);
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if (hdr->cmd_len > sizeof(scmd->cmnd)) {
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ret = -EINVAL;
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goto out_put_request;
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}
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ret = scsi_fill_sghdr_rq(sdev, rq, hdr, mode);
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if (ret < 0)
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goto out_put_request;
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ret = blk_rq_map_user_io(rq, NULL, hdr->dxferp, hdr->dxfer_len,
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GFP_KERNEL, hdr->iovec_count && hdr->dxfer_len,
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hdr->iovec_count, 0, rq_data_dir(rq));
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if (ret)
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goto out_put_request;
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bio = rq->bio;
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scmd->allowed = 0;
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start_time = jiffies;
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blk_execute_rq(rq, at_head);
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hdr->duration = jiffies_to_msecs(jiffies - start_time);
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ret = scsi_complete_sghdr_rq(rq, hdr, bio);
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out_put_request:
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blk_mq_free_request(rq);
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return ret;
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}
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/**
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* sg_scsi_ioctl -- handle deprecated SCSI_IOCTL_SEND_COMMAND ioctl
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* @q: request queue to send scsi commands down
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* @mode: mode used to open the file through which the ioctl has been
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* submitted
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* @sic: userspace structure describing the command to perform
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*
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* Send down the scsi command described by @sic to the device below
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* the request queue @q.
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*
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* Notes:
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* - This interface is deprecated - users should use the SG_IO
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* interface instead, as this is a more flexible approach to
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* performing SCSI commands on a device.
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* - The SCSI command length is determined by examining the 1st byte
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* of the given command. There is no way to override this.
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* - Data transfers are limited to PAGE_SIZE
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* - The length (x + y) must be at least OMAX_SB_LEN bytes long to
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* accommodate the sense buffer when an error occurs.
|
|
* The sense buffer is truncated to OMAX_SB_LEN (16) bytes so that
|
|
* old code will not be surprised.
|
|
* - If a Unix error occurs (e.g. ENOMEM) then the user will receive
|
|
* a negative return and the Unix error code in 'errno'.
|
|
* If the SCSI command succeeds then 0 is returned.
|
|
* Positive numbers returned are the compacted SCSI error codes (4
|
|
* bytes in one int) where the lowest byte is the SCSI status.
|
|
*/
|
|
static int sg_scsi_ioctl(struct request_queue *q, fmode_t mode,
|
|
struct scsi_ioctl_command __user *sic)
|
|
{
|
|
struct request *rq;
|
|
int err;
|
|
unsigned int in_len, out_len, bytes, opcode, cmdlen;
|
|
struct scsi_cmnd *scmd;
|
|
char *buffer = NULL;
|
|
|
|
if (!sic)
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* get in an out lengths, verify they don't exceed a page worth of data
|
|
*/
|
|
if (get_user(in_len, &sic->inlen))
|
|
return -EFAULT;
|
|
if (get_user(out_len, &sic->outlen))
|
|
return -EFAULT;
|
|
if (in_len > PAGE_SIZE || out_len > PAGE_SIZE)
|
|
return -EINVAL;
|
|
if (get_user(opcode, sic->data))
|
|
return -EFAULT;
|
|
|
|
bytes = max(in_len, out_len);
|
|
if (bytes) {
|
|
buffer = kzalloc(bytes, GFP_NOIO | GFP_USER | __GFP_NOWARN);
|
|
if (!buffer)
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
rq = scsi_alloc_request(q, in_len ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(rq)) {
|
|
err = PTR_ERR(rq);
|
|
goto error_free_buffer;
|
|
}
|
|
scmd = blk_mq_rq_to_pdu(rq);
|
|
|
|
cmdlen = COMMAND_SIZE(opcode);
|
|
|
|
/*
|
|
* get command and data to send to device, if any
|
|
*/
|
|
err = -EFAULT;
|
|
scmd->cmd_len = cmdlen;
|
|
if (copy_from_user(scmd->cmnd, sic->data, cmdlen))
|
|
goto error;
|
|
|
|
if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len))
|
|
goto error;
|
|
|
|
err = -EPERM;
|
|
if (!scsi_cmd_allowed(scmd->cmnd, mode))
|
|
goto error;
|
|
|
|
/* default. possible overridden later */
|
|
scmd->allowed = 5;
|
|
|
|
switch (opcode) {
|
|
case SEND_DIAGNOSTIC:
|
|
case FORMAT_UNIT:
|
|
rq->timeout = FORMAT_UNIT_TIMEOUT;
|
|
scmd->allowed = 1;
|
|
break;
|
|
case START_STOP:
|
|
rq->timeout = START_STOP_TIMEOUT;
|
|
break;
|
|
case MOVE_MEDIUM:
|
|
rq->timeout = MOVE_MEDIUM_TIMEOUT;
|
|
break;
|
|
case READ_ELEMENT_STATUS:
|
|
rq->timeout = READ_ELEMENT_STATUS_TIMEOUT;
|
|
break;
|
|
case READ_DEFECT_DATA:
|
|
rq->timeout = READ_DEFECT_DATA_TIMEOUT;
|
|
scmd->allowed = 1;
|
|
break;
|
|
default:
|
|
rq->timeout = BLK_DEFAULT_SG_TIMEOUT;
|
|
break;
|
|
}
|
|
|
|
if (bytes) {
|
|
err = blk_rq_map_kern(q, rq, buffer, bytes, GFP_NOIO);
|
|
if (err)
|
|
goto error;
|
|
}
|
|
|
|
blk_execute_rq(rq, false);
|
|
|
|
err = scmd->result & 0xff; /* only 8 bit SCSI status */
|
|
if (err) {
|
|
if (scmd->sense_len && scmd->sense_buffer) {
|
|
/* limit sense len for backward compatibility */
|
|
if (copy_to_user(sic->data, scmd->sense_buffer,
|
|
min(scmd->sense_len, 16U)))
|
|
err = -EFAULT;
|
|
}
|
|
} else {
|
|
if (copy_to_user(sic->data, buffer, out_len))
|
|
err = -EFAULT;
|
|
}
|
|
|
|
error:
|
|
blk_mq_free_request(rq);
|
|
|
|
error_free_buffer:
|
|
kfree(buffer);
|
|
|
|
return err;
|
|
}
|
|
|
|
int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
if (in_compat_syscall()) {
|
|
struct compat_sg_io_hdr hdr32 = {
|
|
.interface_id = hdr->interface_id,
|
|
.dxfer_direction = hdr->dxfer_direction,
|
|
.cmd_len = hdr->cmd_len,
|
|
.mx_sb_len = hdr->mx_sb_len,
|
|
.iovec_count = hdr->iovec_count,
|
|
.dxfer_len = hdr->dxfer_len,
|
|
.dxferp = (uintptr_t)hdr->dxferp,
|
|
.cmdp = (uintptr_t)hdr->cmdp,
|
|
.sbp = (uintptr_t)hdr->sbp,
|
|
.timeout = hdr->timeout,
|
|
.flags = hdr->flags,
|
|
.pack_id = hdr->pack_id,
|
|
.usr_ptr = (uintptr_t)hdr->usr_ptr,
|
|
.status = hdr->status,
|
|
.masked_status = hdr->masked_status,
|
|
.msg_status = hdr->msg_status,
|
|
.sb_len_wr = hdr->sb_len_wr,
|
|
.host_status = hdr->host_status,
|
|
.driver_status = hdr->driver_status,
|
|
.resid = hdr->resid,
|
|
.duration = hdr->duration,
|
|
.info = hdr->info,
|
|
};
|
|
|
|
if (copy_to_user(argp, &hdr32, sizeof(hdr32)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
if (copy_to_user(argp, hdr, sizeof(*hdr)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(put_sg_io_hdr);
|
|
|
|
int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_sg_io_hdr hdr32;
|
|
|
|
if (in_compat_syscall()) {
|
|
if (copy_from_user(&hdr32, argp, sizeof(hdr32)))
|
|
return -EFAULT;
|
|
|
|
*hdr = (struct sg_io_hdr) {
|
|
.interface_id = hdr32.interface_id,
|
|
.dxfer_direction = hdr32.dxfer_direction,
|
|
.cmd_len = hdr32.cmd_len,
|
|
.mx_sb_len = hdr32.mx_sb_len,
|
|
.iovec_count = hdr32.iovec_count,
|
|
.dxfer_len = hdr32.dxfer_len,
|
|
.dxferp = compat_ptr(hdr32.dxferp),
|
|
.cmdp = compat_ptr(hdr32.cmdp),
|
|
.sbp = compat_ptr(hdr32.sbp),
|
|
.timeout = hdr32.timeout,
|
|
.flags = hdr32.flags,
|
|
.pack_id = hdr32.pack_id,
|
|
.usr_ptr = compat_ptr(hdr32.usr_ptr),
|
|
.status = hdr32.status,
|
|
.masked_status = hdr32.masked_status,
|
|
.msg_status = hdr32.msg_status,
|
|
.sb_len_wr = hdr32.sb_len_wr,
|
|
.host_status = hdr32.host_status,
|
|
.driver_status = hdr32.driver_status,
|
|
.resid = hdr32.resid,
|
|
.duration = hdr32.duration,
|
|
.info = hdr32.info,
|
|
};
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
if (copy_from_user(hdr, argp, sizeof(*hdr)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(get_sg_io_hdr);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
struct compat_cdrom_generic_command {
|
|
unsigned char cmd[CDROM_PACKET_SIZE];
|
|
compat_caddr_t buffer;
|
|
compat_uint_t buflen;
|
|
compat_int_t stat;
|
|
compat_caddr_t sense;
|
|
unsigned char data_direction;
|
|
unsigned char pad[3];
|
|
compat_int_t quiet;
|
|
compat_int_t timeout;
|
|
compat_caddr_t unused;
|
|
};
|
|
#endif
|
|
|
|
static int scsi_get_cdrom_generic_arg(struct cdrom_generic_command *cgc,
|
|
const void __user *arg)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
if (in_compat_syscall()) {
|
|
struct compat_cdrom_generic_command cgc32;
|
|
|
|
if (copy_from_user(&cgc32, arg, sizeof(cgc32)))
|
|
return -EFAULT;
|
|
|
|
*cgc = (struct cdrom_generic_command) {
|
|
.buffer = compat_ptr(cgc32.buffer),
|
|
.buflen = cgc32.buflen,
|
|
.stat = cgc32.stat,
|
|
.sense = compat_ptr(cgc32.sense),
|
|
.data_direction = cgc32.data_direction,
|
|
.quiet = cgc32.quiet,
|
|
.timeout = cgc32.timeout,
|
|
.unused = compat_ptr(cgc32.unused),
|
|
};
|
|
memcpy(&cgc->cmd, &cgc32.cmd, CDROM_PACKET_SIZE);
|
|
return 0;
|
|
}
|
|
#endif
|
|
if (copy_from_user(cgc, arg, sizeof(*cgc)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int scsi_put_cdrom_generic_arg(const struct cdrom_generic_command *cgc,
|
|
void __user *arg)
|
|
{
|
|
#ifdef CONFIG_COMPAT
|
|
if (in_compat_syscall()) {
|
|
struct compat_cdrom_generic_command cgc32 = {
|
|
.buffer = (uintptr_t)(cgc->buffer),
|
|
.buflen = cgc->buflen,
|
|
.stat = cgc->stat,
|
|
.sense = (uintptr_t)(cgc->sense),
|
|
.data_direction = cgc->data_direction,
|
|
.quiet = cgc->quiet,
|
|
.timeout = cgc->timeout,
|
|
.unused = (uintptr_t)(cgc->unused),
|
|
};
|
|
memcpy(&cgc32.cmd, &cgc->cmd, CDROM_PACKET_SIZE);
|
|
|
|
if (copy_to_user(arg, &cgc32, sizeof(cgc32)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
if (copy_to_user(arg, cgc, sizeof(*cgc)))
|
|
return -EFAULT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int scsi_cdrom_send_packet(struct scsi_device *sdev, fmode_t mode,
|
|
void __user *arg)
|
|
{
|
|
struct cdrom_generic_command cgc;
|
|
struct sg_io_hdr hdr;
|
|
int err;
|
|
|
|
err = scsi_get_cdrom_generic_arg(&cgc, arg);
|
|
if (err)
|
|
return err;
|
|
|
|
cgc.timeout = clock_t_to_jiffies(cgc.timeout);
|
|
memset(&hdr, 0, sizeof(hdr));
|
|
hdr.interface_id = 'S';
|
|
hdr.cmd_len = sizeof(cgc.cmd);
|
|
hdr.dxfer_len = cgc.buflen;
|
|
switch (cgc.data_direction) {
|
|
case CGC_DATA_UNKNOWN:
|
|
hdr.dxfer_direction = SG_DXFER_UNKNOWN;
|
|
break;
|
|
case CGC_DATA_WRITE:
|
|
hdr.dxfer_direction = SG_DXFER_TO_DEV;
|
|
break;
|
|
case CGC_DATA_READ:
|
|
hdr.dxfer_direction = SG_DXFER_FROM_DEV;
|
|
break;
|
|
case CGC_DATA_NONE:
|
|
hdr.dxfer_direction = SG_DXFER_NONE;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
hdr.dxferp = cgc.buffer;
|
|
hdr.sbp = cgc.sense;
|
|
if (hdr.sbp)
|
|
hdr.mx_sb_len = sizeof(struct request_sense);
|
|
hdr.timeout = jiffies_to_msecs(cgc.timeout);
|
|
hdr.cmdp = ((struct cdrom_generic_command __user *) arg)->cmd;
|
|
hdr.cmd_len = sizeof(cgc.cmd);
|
|
|
|
err = sg_io(sdev, &hdr, mode);
|
|
if (err == -EFAULT)
|
|
return -EFAULT;
|
|
|
|
if (hdr.status)
|
|
return -EIO;
|
|
|
|
cgc.stat = err;
|
|
cgc.buflen = hdr.resid;
|
|
if (scsi_put_cdrom_generic_arg(&cgc, arg))
|
|
return -EFAULT;
|
|
|
|
return err;
|
|
}
|
|
|
|
static int scsi_ioctl_sg_io(struct scsi_device *sdev, fmode_t mode,
|
|
void __user *argp)
|
|
{
|
|
struct sg_io_hdr hdr;
|
|
int error;
|
|
|
|
error = get_sg_io_hdr(&hdr, argp);
|
|
if (error)
|
|
return error;
|
|
error = sg_io(sdev, &hdr, mode);
|
|
if (error == -EFAULT)
|
|
return error;
|
|
if (put_sg_io_hdr(&hdr, argp))
|
|
return -EFAULT;
|
|
return error;
|
|
}
|
|
|
|
/**
|
|
* scsi_ioctl - Dispatch ioctl to scsi device
|
|
* @sdev: scsi device receiving ioctl
|
|
* @mode: mode the block/char device is opened with
|
|
* @cmd: which ioctl is it
|
|
* @arg: data associated with ioctl
|
|
*
|
|
* Description: The scsi_ioctl() function differs from most ioctls in that it
|
|
* does not take a major/minor number as the dev field. Rather, it takes
|
|
* a pointer to a &struct scsi_device.
|
|
*/
|
|
int scsi_ioctl(struct scsi_device *sdev, fmode_t mode, int cmd,
|
|
void __user *arg)
|
|
{
|
|
struct request_queue *q = sdev->request_queue;
|
|
struct scsi_sense_hdr sense_hdr;
|
|
|
|
/* Check for deprecated ioctls ... all the ioctls which don't
|
|
* follow the new unique numbering scheme are deprecated */
|
|
switch (cmd) {
|
|
case SCSI_IOCTL_SEND_COMMAND:
|
|
case SCSI_IOCTL_TEST_UNIT_READY:
|
|
case SCSI_IOCTL_BENCHMARK_COMMAND:
|
|
case SCSI_IOCTL_SYNC:
|
|
case SCSI_IOCTL_START_UNIT:
|
|
case SCSI_IOCTL_STOP_UNIT:
|
|
printk(KERN_WARNING "program %s is using a deprecated SCSI "
|
|
"ioctl, please convert it to SG_IO\n", current->comm);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
switch (cmd) {
|
|
case SG_GET_VERSION_NUM:
|
|
return sg_get_version(arg);
|
|
case SG_SET_TIMEOUT:
|
|
return sg_set_timeout(sdev, arg);
|
|
case SG_GET_TIMEOUT:
|
|
return jiffies_to_clock_t(sdev->sg_timeout);
|
|
case SG_GET_RESERVED_SIZE:
|
|
return sg_get_reserved_size(sdev, arg);
|
|
case SG_SET_RESERVED_SIZE:
|
|
return sg_set_reserved_size(sdev, arg);
|
|
case SG_EMULATED_HOST:
|
|
return sg_emulated_host(q, arg);
|
|
case SG_IO:
|
|
return scsi_ioctl_sg_io(sdev, mode, arg);
|
|
case SCSI_IOCTL_SEND_COMMAND:
|
|
return sg_scsi_ioctl(q, mode, arg);
|
|
case CDROM_SEND_PACKET:
|
|
return scsi_cdrom_send_packet(sdev, mode, arg);
|
|
case CDROMCLOSETRAY:
|
|
return scsi_send_start_stop(sdev, 3);
|
|
case CDROMEJECT:
|
|
return scsi_send_start_stop(sdev, 2);
|
|
case SCSI_IOCTL_GET_IDLUN:
|
|
return scsi_get_idlun(sdev, arg);
|
|
case SCSI_IOCTL_GET_BUS_NUMBER:
|
|
return put_user(sdev->host->host_no, (int __user *)arg);
|
|
case SCSI_IOCTL_PROBE_HOST:
|
|
return ioctl_probe(sdev->host, arg);
|
|
case SCSI_IOCTL_DOORLOCK:
|
|
return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
|
|
case SCSI_IOCTL_DOORUNLOCK:
|
|
return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
|
|
case SCSI_IOCTL_TEST_UNIT_READY:
|
|
return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT,
|
|
NORMAL_RETRIES, &sense_hdr);
|
|
case SCSI_IOCTL_START_UNIT:
|
|
return scsi_send_start_stop(sdev, 1);
|
|
case SCSI_IOCTL_STOP_UNIT:
|
|
return scsi_send_start_stop(sdev, 0);
|
|
case SCSI_IOCTL_GET_PCI:
|
|
return scsi_ioctl_get_pci(sdev, arg);
|
|
case SG_SCSI_RESET:
|
|
return scsi_ioctl_reset(sdev, arg);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
if (in_compat_syscall()) {
|
|
if (!sdev->host->hostt->compat_ioctl)
|
|
return -EINVAL;
|
|
return sdev->host->hostt->compat_ioctl(sdev, cmd, arg);
|
|
}
|
|
#endif
|
|
if (!sdev->host->hostt->ioctl)
|
|
return -EINVAL;
|
|
return sdev->host->hostt->ioctl(sdev, cmd, arg);
|
|
}
|
|
EXPORT_SYMBOL(scsi_ioctl);
|
|
|
|
/*
|
|
* We can process a reset even when a device isn't fully operable.
|
|
*/
|
|
int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd,
|
|
bool ndelay)
|
|
{
|
|
if (cmd == SG_SCSI_RESET && ndelay) {
|
|
if (scsi_host_in_recovery(sdev->host))
|
|
return -EAGAIN;
|
|
} else {
|
|
if (!scsi_block_when_processing_errors(sdev))
|
|
return -ENODEV;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors);
|