Initial import

1 files changed, 289 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
new file mode 100644
index 000000000..c4f7b56fa
--- /dev/null
+++ b/drivers/scsi/scsi_ioctl.c
@@ -0,0 +1,289 @@
+/*
+ * Changes:
+ * Arnaldo Carvalho de Melo <acme@conectiva.com.br> 08/23/2000
+ * - get rid of some verify_areas and use __copy*user and __get/put_user
+ *   for the ones that remain
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/interrupt.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <asm/uaccess.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/sg.h>
+#include <scsi/scsi_dbg.h>
+
+#include "scsi_logging.h"
+
+#define NORMAL_RETRIES			5
+#define IOCTL_NORMAL_TIMEOUT			(10 * HZ)
+
+#define MAX_BUF PAGE_SIZE
+
+/**
+ * ioctl_probe  --  return host identification
+ * @host:	host to identify
+ * @buffer:	userspace buffer for identification
+ *
+ * Return an identifying string at @buffer, if @buffer is non-NULL, filling
+ * to the length stored at * (int *) @buffer.
+ */
+static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
+{
+	unsigned int len, slen;
+	const char *string;
+
+	if (buffer) {
+		if (get_user(len, (unsigned int __user *) buffer))
+			return -EFAULT;
+
+		if (host->hostt->info)
+			string = host->hostt->info(host);
+		else
+			string = host->hostt->name;
+		if (string) {
+			slen = strlen(string);
+			if (len > slen)
+				len = slen + 1;
+			if (copy_to_user(buffer, string, len))
+				return -EFAULT;
+		}
+	}
+	return 1;
+}
+
+/*
+
+ * The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host.
+ * The IOCTL_NORMAL_TIMEOUT and NORMAL_RETRIES  variables are used.  
+ * 
+ * dev is the SCSI device struct ptr, *(int *) arg is the length of the
+ * input data, if any, not including the command string & counts, 
+ * *((int *)arg + 1) is the output buffer size in bytes.
+ * 
+ * *(char *) ((int *) arg)[2] the actual command byte.   
+ * 
+ * Note that if more than MAX_BUF bytes are requested to be transferred,
+ * the ioctl will fail with error EINVAL.
+ * 
+ * This size *does not* include the initial lengths that were passed.
+ * 
+ * The SCSI command is read from the memory location immediately after the
+ * length words, and the input data is right after the command.  The SCSI
+ * routines know the command size based on the opcode decode.  
+ * 
+ * The output area is then filled in starting from the command byte. 
+ */
+
+static int ioctl_internal_command(struct scsi_device *sdev, char *cmd,
+				  int timeout, int retries)
+{
+	int result;
+	struct scsi_sense_hdr sshdr;
+
+	SCSI_LOG_IOCTL(1, sdev_printk(KERN_INFO, sdev,
+				      "Trying ioctl with scsi command %d\n", *cmd));
+
+	result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, 0,
+				  &sshdr, timeout, retries, NULL);
+
+	SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
+				      "Ioctl returned  0x%x\n", result));
+
+	if ((driver_byte(result) & DRIVER_SENSE) &&
+	    (scsi_sense_valid(&sshdr))) {
+		switch (sshdr.sense_key) {
+		case ILLEGAL_REQUEST:
+			if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
+				sdev->lockable = 0;
+			else
+				sdev_printk(KERN_INFO, sdev,
+					    "ioctl_internal_command: "
+					    "ILLEGAL REQUEST "
+					    "asc=0x%x ascq=0x%x\n",
+					    sshdr.asc, sshdr.ascq);
+			break;
+		case NOT_READY:	/* This happens if there is no disc in drive */
+			if (sdev->removable)
+				break;
+		case UNIT_ATTENTION:
+			if (sdev->removable) {
+				sdev->changed = 1;
+				result = 0;	/* This is no longer considered an error */
+				break;
+			}
+		default:	/* Fall through for non-removable media */
+			sdev_printk(KERN_INFO, sdev,
+				    "ioctl_internal_command return code = %x\n",
+				    result);
+			scsi_print_sense_hdr(sdev, NULL, &sshdr);
+			break;
+		}
+	}
+
+	SCSI_LOG_IOCTL(2, sdev_printk(KERN_INFO, sdev,
+				      "IOCTL Releasing command\n"));
+	return result;
+}
+
+int scsi_set_medium_removal(struct scsi_device *sdev, char state)
+{
+	char scsi_cmd[MAX_COMMAND_SIZE];
+	int ret;
+
+	if (!sdev->removable || !sdev->lockable)
+	       return 0;
+
+	scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL;
+	scsi_cmd[1] = 0;
+	scsi_cmd[2] = 0;
+	scsi_cmd[3] = 0;
+	scsi_cmd[4] = state;
+	scsi_cmd[5] = 0;
+
+	ret = ioctl_internal_command(sdev, scsi_cmd,
+			IOCTL_NORMAL_TIMEOUT, NORMAL_RETRIES);
+	if (ret == 0)
+		sdev->locked = (state == SCSI_REMOVAL_PREVENT);
+	return ret;
+}
+EXPORT_SYMBOL(scsi_set_medium_removal);
+
+/*
+ * The scsi_ioctl_get_pci() function places into arg the value
+ * pci_dev::slot_name (8 characters) for the PCI device (if any).
+ * Returns: 0 on success
+ *          -ENXIO if there isn't a PCI device pointer
+ *                 (could be because the SCSI driver hasn't been
+ *                  updated yet, or because it isn't a SCSI
+ *                  device)
+ *          any copy_to_user() error on failure there
+ */
+static int scsi_ioctl_get_pci(struct scsi_device *sdev, void __user *arg)
+{
+	struct device *dev = scsi_get_device(sdev->host);
+	const char *name;
+
+        if (!dev)
+		return -ENXIO;
+
+	name = dev_name(dev);
+
+	/* compatibility with old ioctl which only returned
+	 * 20 characters */
+        return copy_to_user(arg, name, min(strlen(name), (size_t)20))
+		? -EFAULT: 0;
+}
+
+
+/**
+ * scsi_ioctl - Dispatch ioctl to scsi device
+ * @sdev: scsi device receiving ioctl
+ * @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, int cmd, void __user *arg)
+{
+	char scsi_cmd[MAX_COMMAND_SIZE];
+
+	/* 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 SCSI_IOCTL_GET_IDLUN:
+		if (!access_ok(VERIFY_WRITE, arg, sizeof(struct scsi_idlun)))
+			return -EFAULT;
+
+		__put_user((sdev->id & 0xff)
+			 + ((sdev->lun & 0xff) << 8)
+			 + ((sdev->channel & 0xff) << 16)
+			 + ((sdev->host->host_no & 0xff) << 24),
+			 &((struct scsi_idlun __user *)arg)->dev_id);
+		__put_user(sdev->host->unique_id,
+			 &((struct scsi_idlun __user *)arg)->host_unique_id);
+		return 0;
+	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_SEND_COMMAND:
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		return sg_scsi_ioctl(sdev->request_queue, NULL, 0, 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, NULL);
+	case SCSI_IOCTL_START_UNIT:
+		scsi_cmd[0] = START_STOP;
+		scsi_cmd[1] = 0;
+		scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
+		scsi_cmd[4] = 1;
+		return ioctl_internal_command(sdev, scsi_cmd,
+				     START_STOP_TIMEOUT, NORMAL_RETRIES);
+	case SCSI_IOCTL_STOP_UNIT:
+		scsi_cmd[0] = START_STOP;
+		scsi_cmd[1] = 0;
+		scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0;
+		scsi_cmd[4] = 0;
+		return ioctl_internal_command(sdev, scsi_cmd,
+				     START_STOP_TIMEOUT, NORMAL_RETRIES);
+        case SCSI_IOCTL_GET_PCI:
+                return scsi_ioctl_get_pci(sdev, arg);
+	case SG_SCSI_RESET:
+		return scsi_ioctl_reset(sdev, arg);
+	default:
+		if (sdev->host->hostt->ioctl)
+			return sdev->host->hostt->ioctl(sdev, cmd, arg);
+	}
+	return -EINVAL;
+}
+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);