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319 lines
8.6 KiB
319 lines
8.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Changes: |
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* Arnaldo Carvalho de Melo <[email protected]> 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 <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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/* |
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|
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* The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host. |
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* The IOCTL_NORMAL_TIMEOUT and NORMAL_RETRIES variables are used. |
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* |
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* dev is the SCSI device struct ptr, *(int *) arg is the length of the |
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* input data, if any, not including the command string & counts, |
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* *((int *)arg + 1) is the output buffer size in bytes. |
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* |
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* *(char *) ((int *) arg)[2] the actual command byte. |
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* |
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* Note that if more than MAX_BUF bytes are requested to be transferred, |
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* the ioctl will fail with error EINVAL. |
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* |
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* This size *does not* include the initial lengths that were passed. |
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* |
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* The SCSI command is read from the memory location immediately after the |
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* length words, and the input data is right after the command. The SCSI |
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* routines know the command size based on the opcode decode. |
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* |
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* The output area is then filled in starting from the command byte. |
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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 (driver_byte(result) == DRIVER_SENSE && |
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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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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 scsi_ioctl_common(struct scsi_device *sdev, int cmd, void __user *arg) |
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{ |
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char scsi_cmd[MAX_COMMAND_SIZE]; |
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struct scsi_sense_hdr sense_hdr; |
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/* Check for deprecated ioctls ... all the ioctls which don't |
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* follow the new unique numbering scheme are deprecated */ |
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switch (cmd) { |
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case SCSI_IOCTL_SEND_COMMAND: |
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case SCSI_IOCTL_TEST_UNIT_READY: |
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case SCSI_IOCTL_BENCHMARK_COMMAND: |
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case SCSI_IOCTL_SYNC: |
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case SCSI_IOCTL_START_UNIT: |
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case SCSI_IOCTL_STOP_UNIT: |
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printk(KERN_WARNING "program %s is using a deprecated SCSI " |
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"ioctl, please convert it to SG_IO\n", current->comm); |
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break; |
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default: |
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break; |
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} |
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switch (cmd) { |
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case SCSI_IOCTL_GET_IDLUN: { |
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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(arg, &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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case SCSI_IOCTL_GET_BUS_NUMBER: |
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return put_user(sdev->host->host_no, (int __user *)arg); |
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case SCSI_IOCTL_PROBE_HOST: |
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return ioctl_probe(sdev->host, arg); |
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case SCSI_IOCTL_SEND_COMMAND: |
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if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) |
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return -EACCES; |
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return sg_scsi_ioctl(sdev->request_queue, NULL, 0, arg); |
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case SCSI_IOCTL_DOORLOCK: |
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return scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); |
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case SCSI_IOCTL_DOORUNLOCK: |
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return scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); |
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case SCSI_IOCTL_TEST_UNIT_READY: |
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return scsi_test_unit_ready(sdev, IOCTL_NORMAL_TIMEOUT, |
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NORMAL_RETRIES, &sense_hdr); |
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case SCSI_IOCTL_START_UNIT: |
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scsi_cmd[0] = START_STOP; |
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scsi_cmd[1] = 0; |
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scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; |
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scsi_cmd[4] = 1; |
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return ioctl_internal_command(sdev, scsi_cmd, |
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START_STOP_TIMEOUT, NORMAL_RETRIES); |
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case SCSI_IOCTL_STOP_UNIT: |
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scsi_cmd[0] = START_STOP; |
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scsi_cmd[1] = 0; |
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scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; |
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scsi_cmd[4] = 0; |
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return ioctl_internal_command(sdev, scsi_cmd, |
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START_STOP_TIMEOUT, NORMAL_RETRIES); |
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case SCSI_IOCTL_GET_PCI: |
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return scsi_ioctl_get_pci(sdev, arg); |
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case SG_SCSI_RESET: |
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return scsi_ioctl_reset(sdev, arg); |
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} |
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return -ENOIOCTLCMD; |
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} |
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/** |
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* scsi_ioctl - Dispatch ioctl to scsi device |
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* @sdev: scsi device receiving ioctl |
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* @cmd: which ioctl is it |
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* @arg: data associated with ioctl |
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* |
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* Description: The scsi_ioctl() function differs from most ioctls in that it |
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* does not take a major/minor number as the dev field. Rather, it takes |
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* a pointer to a &struct scsi_device. |
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*/ |
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int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) |
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{ |
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int ret = scsi_ioctl_common(sdev, cmd, arg); |
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if (ret != -ENOIOCTLCMD) |
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return ret; |
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if (sdev->host->hostt->ioctl) |
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return sdev->host->hostt->ioctl(sdev, cmd, arg); |
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return -EINVAL; |
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} |
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EXPORT_SYMBOL(scsi_ioctl); |
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#ifdef CONFIG_COMPAT |
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int scsi_compat_ioctl(struct scsi_device *sdev, int cmd, void __user *arg) |
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{ |
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int ret = scsi_ioctl_common(sdev, cmd, arg); |
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if (ret != -ENOIOCTLCMD) |
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return ret; |
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if (sdev->host->hostt->compat_ioctl) |
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return sdev->host->hostt->compat_ioctl(sdev, cmd, arg); |
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return ret; |
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} |
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EXPORT_SYMBOL(scsi_compat_ioctl); |
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#endif |
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/* |
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* We can process a reset even when a device isn't fully operable. |
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*/ |
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int scsi_ioctl_block_when_processing_errors(struct scsi_device *sdev, int cmd, |
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bool ndelay) |
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{ |
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if (cmd == SG_SCSI_RESET && ndelay) { |
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if (scsi_host_in_recovery(sdev->host)) |
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return -EAGAIN; |
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} else { |
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if (!scsi_block_when_processing_errors(sdev)) |
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return -ENODEV; |
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} |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(scsi_ioctl_block_when_processing_errors);
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