/* * Don't import our own symbols, as this would severely mess up our * symbol tables. */ #define _SCSI_SYMS_VER_ #define __NO_VERSION__ #include #include #include #include #include #include #include #include #include #include #include "scsi.h" #include "hosts.h" #include "scsi_ioctl.h" #define MAX_RETRIES 5 #define MAX_TIMEOUT 900 #define MAX_BUF 4096 #define max(a,b) (((a) > (b)) ? (a) : (b)) /* * 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 *buffer) { int temp, result; unsigned int len,slen; const char * string; if ((temp = host->hostt->present) && buffer) { result = verify_area(VERIFY_READ, buffer, sizeof(long)); if (result) return result; len = get_user ((unsigned int *) buffer); 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; result = verify_area(VERIFY_WRITE, buffer, len); if (result) return result; memcpy_tofs (buffer, string, len); } } return temp; } /* * * The SCSI_IOCTL_SEND_COMMAND ioctl sends a command out to the SCSI host. * The MAX_TIMEOUT and MAX_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 no more than MAX_BUF data bytes will be transfered. Since * SCSI block device size is 512 bytes, I figured 1K was good. * but (WDE) changed it to 8192 to handle large bad track buffers. * ERY: I changed this to a dynamic allocation using scsi_malloc - we were * getting a kernel stack overflow which was crashing the system when we * were using 8192 bytes. * * 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 void scsi_ioctl_done (Scsi_Cmnd * SCpnt) { struct request * req; req = &SCpnt->request; req->rq_status = RQ_SCSI_DONE; /* Busy, but indicate request done */ if (req->sem != NULL) { up(req->sem); } } static int ioctl_internal_command(Scsi_Device *dev, char * cmd) { int result; Scsi_Cmnd * SCpnt; SCpnt = allocate_device(NULL, dev, 1); { struct semaphore sem = MUTEX_LOCKED; SCpnt->request.sem = &sem; scsi_do_cmd(SCpnt, cmd, NULL, 0, scsi_ioctl_done, MAX_TIMEOUT, MAX_RETRIES); down(&sem); } if(driver_byte(SCpnt->result) != 0) switch(SCpnt->sense_buffer[2] & 0xf) { case ILLEGAL_REQUEST: if(cmd[0] == ALLOW_MEDIUM_REMOVAL) dev->lockable = 0; else printk("SCSI device (ioctl) reports ILLEGAL REQUEST.\n"); break; case NOT_READY: /* This happens if there is no disc in drive */ if(dev->removable){ printk(KERN_INFO "Device not ready. Make sure there is a disc in the drive.\n"); break; }; case UNIT_ATTENTION: if (dev->removable){ dev->changed = 1; SCpnt->result = 0; /* This is no longer considered an error */ printk(KERN_INFO "Disc change detected.\n"); break; }; default: /* Fall through for non-removable media */ printk("SCSI error: host %d id %d lun %d return code = %x\n", dev->host->host_no, dev->id, dev->lun, SCpnt->result); printk("\tSense class %x, sense error %x, extended sense %x\n", sense_class(SCpnt->sense_buffer[0]), sense_error(SCpnt->sense_buffer[0]), SCpnt->sense_buffer[2] & 0xf); }; result = SCpnt->result; SCpnt->request.rq_status = RQ_INACTIVE; wake_up(&SCpnt->device->device_wait); return result; } /* * This interface is depreciated - users should use the scsi generics * interface instead, as this is a more flexible approach to performing * generic SCSI commands on a device. */ static int ioctl_command(Scsi_Device *dev, void *buffer) { char * buf; char cmd[12]; char * cmd_in; Scsi_Cmnd * SCpnt; unsigned char opcode; int inlen, outlen, cmdlen; int needed, buf_needed; int result; if (!buffer) return -EINVAL; /* * Verify that we can read at least this much. */ result = verify_area(VERIFY_READ, buffer, 2*sizeof(long) + 1); if (result) return result; /* * The structure that we are passed should look like: * * struct sdata{ * int inlen; * int outlen; * char cmd[]; # However many bytes are used for cmd. * char data[]; */ inlen = get_user((unsigned int *) buffer); outlen = get_user( ((unsigned int *) buffer) + 1); /* * 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 instead. */ if( inlen > MAX_BUF ) inlen = MAX_BUF; if( outlen > MAX_BUF ) outlen = MAX_BUF; cmd_in = (char *) ( ((int *)buffer) + 2); opcode = get_user(cmd_in); 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 = (char *) scsi_malloc(buf_needed); if (!buf) return -ENOMEM; memset(buf, 0, buf_needed); } else buf = NULL; /* * Obtain the command from the user's address space. */ cmdlen = COMMAND_SIZE(opcode); result = verify_area(VERIFY_READ, cmd_in, cmdlen + inlen > MAX_BUF ? MAX_BUF : inlen); if (result) return result; memcpy_fromfs ((void *) cmd, cmd_in, cmdlen); /* * Obtain the data to be sent to the device (if any). */ memcpy_fromfs ((void *) buf, (void *) (cmd_in + cmdlen), inlen); /* * Set the lun field to the correct value. */ cmd[1] = ( cmd[1] & 0x1f ) | (dev->lun << 5); #ifndef DEBUG_NO_CMD SCpnt = allocate_device(NULL, dev, 1); { struct semaphore sem = MUTEX_LOCKED; SCpnt->request.sem = &sem; scsi_do_cmd(SCpnt, cmd, buf, needed, scsi_ioctl_done, MAX_TIMEOUT, MAX_RETRIES); down(&sem); } /* * If there was an error condition, pass the info back to the user. */ if(SCpnt->result) { result = verify_area(VERIFY_WRITE, cmd_in, sizeof(SCpnt->sense_buffer)); if (result) return result; memcpy_tofs((void *) cmd_in, SCpnt->sense_buffer, sizeof(SCpnt->sense_buffer)); } else { result = verify_area(VERIFY_WRITE, cmd_in, outlen); if (result) return result; memcpy_tofs ((void *) cmd_in, buf, outlen); } result = SCpnt->result; SCpnt->request.rq_status = RQ_INACTIVE; if (buf) scsi_free(buf, buf_needed); if(SCpnt->device->scsi_request_fn) (*SCpnt->device->scsi_request_fn)(); wake_up(&SCpnt->device->device_wait); return result; #else { int i; printk("scsi_ioctl : device %d. command = ", dev->id); for (i = 0; i < 12; ++i) printk("%02x ", cmd[i]); printk("\nbuffer ="); for (i = 0; i < 20; ++i) printk("%02x ", buf[i]); printk("\n"); printk("inlen = %d, outlen = %d, cmdlen = %d\n", inlen, outlen, cmdlen); printk("buffer = %d, cmd_in = %d\n", buffer, cmd_in); } return 0; #endif } /* * the scsi_ioctl() function differs from most ioctls in that it does * not take a major/minor number as the dev filed. Rather, it takes * a pointer to a scsi_devices[] element, a structure. */ int scsi_ioctl (Scsi_Device *dev, int cmd, void *arg) { int result; char scsi_cmd[12]; /* No idea how this happens.... */ if (!dev) return -ENXIO; switch (cmd) { case SCSI_IOCTL_GET_IDLUN: result = verify_area(VERIFY_WRITE, (void *) arg, 2*sizeof(long)); if (result) return result; put_user(dev->id + (dev->lun << 8) + (dev->channel << 16) + ((dev->host->hostt->proc_dir->low_ino & 0xff) << 24), (unsigned long *) arg); put_user( dev->host->unique_id, (unsigned long *) arg+1); return 0; case SCSI_IOCTL_TAGGED_ENABLE: if(!suser()) return -EACCES; if(!dev->tagged_supported) return -EINVAL; dev->tagged_queue = 1; dev->current_tag = 1; break; case SCSI_IOCTL_TAGGED_DISABLE: if(!suser()) return -EACCES; if(!dev->tagged_supported) return -EINVAL; dev->tagged_queue = 0; dev->current_tag = 0; break; case SCSI_IOCTL_PROBE_HOST: return ioctl_probe(dev->host, arg); case SCSI_IOCTL_SEND_COMMAND: if(!suser()) return -EACCES; return ioctl_command((Scsi_Device *) dev, arg); case SCSI_IOCTL_DOORLOCK: if (!dev->removable || !dev->lockable) return 0; scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL; scsi_cmd[1] = dev->lun << 5; scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; scsi_cmd[4] = SCSI_REMOVAL_PREVENT; return ioctl_internal_command((Scsi_Device *) dev, scsi_cmd); break; case SCSI_IOCTL_DOORUNLOCK: if (!dev->removable || !dev->lockable) return 0; scsi_cmd[0] = ALLOW_MEDIUM_REMOVAL; scsi_cmd[1] = dev->lun << 5; scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; scsi_cmd[4] = SCSI_REMOVAL_ALLOW; return ioctl_internal_command((Scsi_Device *) dev, scsi_cmd); case SCSI_IOCTL_TEST_UNIT_READY: scsi_cmd[0] = TEST_UNIT_READY; scsi_cmd[1] = dev->lun << 5; scsi_cmd[2] = scsi_cmd[3] = scsi_cmd[5] = 0; scsi_cmd[4] = 0; return ioctl_internal_command((Scsi_Device *) dev, scsi_cmd); break; default : return -EINVAL; } return -EINVAL; } /* * Just like scsi_ioctl, only callable from kernel space with no * fs segment fiddling. */ int kernel_scsi_ioctl (Scsi_Device *dev, int cmd, void *arg) { unsigned long oldfs; int tmp; oldfs = get_fs(); set_fs(get_ds()); tmp = scsi_ioctl (dev, cmd, arg); set_fs(oldfs); return tmp; } /* * Overrides for Emacs so that we almost follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only. This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-indent-level: 4 * c-brace-imaginary-offset: 0 * c-brace-offset: -4 * c-argdecl-indent: 4 * c-label-offset: -4 * c-continued-statement-offset: 4 * c-continued-brace-offset: 0 * indent-tabs-mode: nil * tab-width: 8 * End: */