Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 516 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_ioctl.c b/drivers/scsi/scsi_ioctl.c
new file mode 100644
index 0000000..68c9728
--- /dev/null
+++ b/drivers/scsi/scsi_ioctl.c
@@ -0,0 +1,516 @@
+/*
+ * 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_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_request.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 FORMAT_UNIT_TIMEOUT		(2 * 60 * 60 * HZ)
+#define START_STOP_TIMEOUT		(60 * HZ)
+#define MOVE_MEDIUM_TIMEOUT		(5 * 60 * HZ)
+#define READ_ELEMENT_STATUS_TIMEOUT	(5 * 60 * HZ)
+#define READ_DEFECT_DATA_TIMEOUT	(60 * HZ )  /* ZIP-250 on parallel port takes as long! */
+
+#define MAX_BUF PAGE_SIZE
+
+/*
+ * If we are told to probe a host, we will return 0 if  the host is not
+ * present, 1 if the host is present, and will return an identifying
+ * string at *arg, if arg is non null, filling to the length stored at
+ * (int *) arg
+ */
+
+static int ioctl_probe(struct Scsi_Host *host, void __user *buffer)
+{
+	unsigned int len, slen;
+	const char *string;
+	int temp = host->hostt->present;
+
+	if (temp && 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 temp;
+}
+
+/*
+
+ * 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)
+{
+	struct scsi_request *sreq;
+	int result;
+	struct scsi_sense_hdr sshdr;
+
+	SCSI_LOG_IOCTL(1, printk("Trying ioctl with scsi command %d\n", *cmd));
+
+	sreq = scsi_allocate_request(sdev, GFP_KERNEL);
+	if (!sreq) {
+		printk(KERN_WARNING "SCSI internal ioctl failed, no memory\n");
+		return -ENOMEM;
+	}
+
+	sreq->sr_data_direction = DMA_NONE;
+        scsi_wait_req(sreq, cmd, NULL, 0, timeout, retries);
+
+	SCSI_LOG_IOCTL(2, printk("Ioctl returned  0x%x\n", sreq->sr_result));
+
+	if ((driver_byte(sreq->sr_result) & DRIVER_SENSE) &&
+	    (scsi_request_normalize_sense(sreq, &sshdr))) {
+		switch (sshdr.sense_key) {
+		case ILLEGAL_REQUEST:
+			if (cmd[0] == ALLOW_MEDIUM_REMOVAL)
+				sdev->lockable = 0;
+			else
+				printk(KERN_INFO "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 && (cmd[0] != TEST_UNIT_READY)) {
+				printk(KERN_INFO "Device not ready. Make sure"
+				       " there is a disc in the drive.\n");
+				break;
+			}
+		case UNIT_ATTENTION:
+			if (sdev->removable) {
+				sdev->changed = 1;
+				sreq->sr_result = 0;	/* This is no longer considered an error */
+				break;
+			}
+		default:	/* Fall through for non-removable media */
+			printk(KERN_INFO "ioctl_internal_command: <%d %d %d "
+			       "%d> return code = %x\n",
+			       sdev->host->host_no,
+			       sdev->channel,
+			       sdev->id,
+			       sdev->lun,
+			       sreq->sr_result);
+			scsi_print_req_sense("   ", sreq);
+			break;
+		}
+	}
+
+	result = sreq->sr_result;
+	SCSI_LOG_IOCTL(2, printk("IOCTL Releasing command\n"));
+	scsi_release_request(sreq);
+	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);
+
+/*
+ * This interface is deprecated - users should use the scsi generic (sg)
+ * interface instead, as this is a more flexible approach to performing
+ * generic SCSI commands on a device.
+ *
+ * The structure that we are passed should look like:
+ *
+ * struct sdata {
+ *  unsigned int inlen;      [i] Length of data to be written to device 
+ *  unsigned int outlen;     [i] Length of data to be read from device 
+ *  unsigned char cmd[x];    [i] SCSI command (6 <= x <= 12).
+ *                           [o] Data read from device starts here.
+ *                           [o] On error, sense buffer starts here.
+ *  unsigned char wdata[y];  [i] Data written to device starts here.
+ * };
+ * Notes:
+ *   -  The SCSI command length is determined by examining the 1st byte
+ *      of the given command. There is no way to override this.
+ *   -  Data transfers are limited to PAGE_SIZE (4K on i386, 8K on alpha).
+ *   -  The length (x + y) must be at least OMAX_SB_LEN bytes long to
+ *      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.
+ *      See the drivers/scsi/scsi.h file for more information on this.
+ *
+ */
+#define OMAX_SB_LEN 16		/* Old sense buffer length */
+
+int scsi_ioctl_send_command(struct scsi_device *sdev,
+			    struct scsi_ioctl_command __user *sic)
+{
+	char *buf;
+	unsigned char cmd[MAX_COMMAND_SIZE];
+	char __user *cmd_in;
+	struct scsi_request *sreq;
+	unsigned char opcode;
+	unsigned int inlen, outlen, cmdlen;
+	unsigned int needed, buf_needed;
+	int timeout, retries, result;
+	int data_direction, gfp_mask = GFP_KERNEL;
+
+	if (!sic)
+		return -EINVAL;
+
+	if (sdev->host->unchecked_isa_dma)
+		gfp_mask |= GFP_DMA;
+
+	/*
+	 * Verify that we can read at least this much.
+	 */
+	if (!access_ok(VERIFY_READ, sic, sizeof(Scsi_Ioctl_Command)))
+		return -EFAULT;
+
+	if(__get_user(inlen, &sic->inlen))
+		return -EFAULT;
+		
+	if(__get_user(outlen, &sic->outlen))
+		return -EFAULT;
+
+	/*
+	 * We do not transfer more than MAX_BUF with this interface.
+	 * If the user needs to transfer more data than this, they
+	 * should use scsi_generics (sg) instead.
+	 */
+	if (inlen > MAX_BUF)
+		return -EINVAL;
+	if (outlen > MAX_BUF)
+		return -EINVAL;
+
+	cmd_in = sic->data;
+	if(get_user(opcode, cmd_in))
+		return -EFAULT;
+
+	needed = buf_needed = (inlen > outlen ? inlen : outlen);
+	if (buf_needed) {
+		buf_needed = (buf_needed + 511) & ~511;
+		if (buf_needed > MAX_BUF)
+			buf_needed = MAX_BUF;
+		buf = kmalloc(buf_needed, gfp_mask);
+		if (!buf)
+			return -ENOMEM;
+		memset(buf, 0, buf_needed);
+		if (inlen == 0) {
+			data_direction = DMA_FROM_DEVICE;
+		} else if (outlen == 0 ) {
+			data_direction = DMA_TO_DEVICE;
+		} else {
+			/*
+			 * Can this ever happen?
+			 */
+			data_direction = DMA_BIDIRECTIONAL;
+		}
+
+	} else {
+		buf = NULL;
+		data_direction = DMA_NONE;
+	}
+
+	/*
+	 * Obtain the command from the user's address space.
+	 */
+	cmdlen = COMMAND_SIZE(opcode);
+	
+	result = -EFAULT;
+
+	if (!access_ok(VERIFY_READ, cmd_in, cmdlen + inlen))
+		goto error;
+
+	if(__copy_from_user(cmd, cmd_in, cmdlen))
+		goto error;
+
+	/*
+	 * Obtain the data to be sent to the device (if any).
+	 */
+
+	if(copy_from_user(buf, cmd_in + cmdlen, inlen))
+		goto error;
+
+	switch (opcode) {
+	case SEND_DIAGNOSTIC:
+	case FORMAT_UNIT:
+		timeout = FORMAT_UNIT_TIMEOUT;
+		retries = 1;
+		break;
+	case START_STOP:
+		timeout = START_STOP_TIMEOUT;
+		retries = NORMAL_RETRIES;
+		break;
+	case MOVE_MEDIUM:
+		timeout = MOVE_MEDIUM_TIMEOUT;
+		retries = NORMAL_RETRIES;
+		break;
+	case READ_ELEMENT_STATUS:
+		timeout = READ_ELEMENT_STATUS_TIMEOUT;
+		retries = NORMAL_RETRIES;
+		break;
+	case READ_DEFECT_DATA:
+		timeout = READ_DEFECT_DATA_TIMEOUT;
+		retries = 1;
+		break;
+	default:
+		timeout = IOCTL_NORMAL_TIMEOUT;
+		retries = NORMAL_RETRIES;
+		break;
+	}
+
+	sreq = scsi_allocate_request(sdev, GFP_KERNEL);
+        if (!sreq) {
+                result = -EINTR;
+                goto error;
+        }
+
+	sreq->sr_data_direction = data_direction;
+        scsi_wait_req(sreq, cmd, buf, needed, timeout, retries);
+
+	/* 
+	 * If there was an error condition, pass the info back to the user. 
+	 */
+	result = sreq->sr_result;
+	if (result) {
+		int sb_len = sizeof(sreq->sr_sense_buffer);
+
+		sb_len = (sb_len > OMAX_SB_LEN) ? OMAX_SB_LEN : sb_len;
+		if (copy_to_user(cmd_in, sreq->sr_sense_buffer, sb_len))
+			result = -EFAULT;
+	} else {
+		if (copy_to_user(cmd_in, buf, outlen))
+			result = -EFAULT;
+	}	
+
+	scsi_release_request(sreq);
+error:
+	kfree(buf);
+	return result;
+}
+EXPORT_SYMBOL(scsi_ioctl_send_command);
+
+/*
+ * 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);
+
+        if (!dev)
+		return -ENXIO;
+        return copy_to_user(arg, dev->bus_id, sizeof(dev->bus_id))? -EFAULT: 0;
+}
+
+
+/*
+ * 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 scsi_devices[] element, a structure. 
+ */
+int scsi_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
+{
+	char scsi_cmd[MAX_COMMAND_SIZE];
+
+	/* No idea how this happens.... */
+	if (!sdev)
+		return -ENXIO;
+
+	/*
+	 * If we are in the middle of error recovery, don't let anyone
+	 * else try and use this device.  Also, if error recovery fails, it
+	 * may try and take the device offline, in which case all further
+	 * access to the device is prohibited.
+	 */
+	if (!scsi_block_when_processing_errors(sdev))
+		return -ENODEV;
+
+	/* 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 scsi_ioctl_send_command(sdev, 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);
+	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);
+	default:
+		if (sdev->host->hostt->ioctl)
+			return sdev->host->hostt->ioctl(sdev, cmd, arg);
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(scsi_ioctl);
+
+/*
+ * the scsi_nonblock_ioctl() function is designed for ioctls which may
+ * be executed even if the device is in recovery.
+ */
+int scsi_nonblockable_ioctl(struct scsi_device *sdev, int cmd,
+			    void __user *arg, struct file *filp)
+{
+	int val, result;
+
+	/* The first set of iocts may be executed even if we're doing
+	 * error processing, as long as the device was opened
+	 * non-blocking */
+	if (filp && filp->f_flags & O_NONBLOCK) {
+		if (test_bit(SHOST_RECOVERY,
+			     &sdev->host->shost_state))
+			return -ENODEV;
+	} else if (!scsi_block_when_processing_errors(sdev))
+		return -ENODEV;
+
+	switch (cmd) {
+	case SG_SCSI_RESET:
+		result = get_user(val, (int __user *)arg);
+		if (result)
+			return result;
+		if (val == SG_SCSI_RESET_NOTHING)
+			return 0;
+		switch (val) {
+		case SG_SCSI_RESET_DEVICE:
+			val = SCSI_TRY_RESET_DEVICE;
+			break;
+		case SG_SCSI_RESET_BUS:
+			val = SCSI_TRY_RESET_BUS;
+			break;
+		case SG_SCSI_RESET_HOST:
+			val = SCSI_TRY_RESET_HOST;
+			break;
+		default:
+			return -EINVAL;
+		}
+		if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
+			return -EACCES;
+		return (scsi_reset_provider(sdev, val) ==
+			SUCCESS) ? 0 : -EIO;
+	}
+	return -ENODEV;
+}
+EXPORT_SYMBOL(scsi_nonblockable_ioctl);