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 000000000000..68c9728dfbbb
--- /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);