/* SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying file README.st for more information. History: Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. Contribution and ideas from several people including (in alphabetical order) Klaus Ehrenfried, Wolfgang Denk, Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, J"org Weule, and Eric Youngdale. Copyright 1992 - 1999 Kai Makisara email Kai.Makisara@metla.fi Last modified: Tue May 18 08:32:34 1999 by makisara@home Some small formal changes - aeb, 950809 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* The driver prints some debugging information on the console if DEBUG is defined and non-zero. */ #define DEBUG 0 /* The message level for the debug messages is currently set to KERN_NOTICE so that people can easily see the messages. Later when the debugging messages in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ #define ST_DEB_MSG KERN_NOTICE #define MAJOR_NR SCSI_TAPE_MAJOR #include #include "scsi.h" #include "hosts.h" #include #define ST_KILOBYTE 1024 #include "st_options.h" #include "st.h" #include "constants.h" #ifdef MODULE MODULE_PARM(buffer_kbs, "i"); MODULE_PARM(write_threshold_kbs, "i"); MODULE_PARM(max_buffers, "i"); MODULE_PARM(max_sg_segs, "i"); static int buffer_kbs = 0; static int write_threshold_kbs = 0; static int max_buffers = 0; static int max_sg_segs = 0; #endif /* The default definitions have been moved to st_options.h */ #define ST_BUFFER_SIZE (ST_BUFFER_BLOCKS * ST_KILOBYTE) #define ST_WRITE_THRESHOLD (ST_WRITE_THRESHOLD_BLOCKS * ST_KILOBYTE) /* The buffer size should fit into the 24 bits for length in the 6-byte SCSI read and write commands. */ #if ST_BUFFER_SIZE >= (2 << 24 - 1) #error "Buffer size should not exceed (2 << 24 - 1) bytes!" #endif #if DEBUG static int debugging = 1; #endif #define MAX_RETRIES 0 #define MAX_WRITE_RETRIES 0 #define MAX_READY_RETRIES 5 #define NO_TAPE NOT_READY #define ST_TIMEOUT (900 * HZ) #define ST_LONG_TIMEOUT (14000 * HZ) #define TAPE_NR(x) (MINOR(x) & ~(128 | ST_MODE_MASK)) #define TAPE_MODE(x) ((MINOR(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 24 bits) */ #define SET_DENS_AND_BLK 0x10001 static int st_nbr_buffers; static ST_buffer **st_buffers; static int st_buffer_size = ST_BUFFER_SIZE; static int st_write_threshold = ST_WRITE_THRESHOLD; static int st_max_buffers = ST_MAX_BUFFERS; static int st_max_sg_segs = ST_MAX_SG; static Scsi_Tape * scsi_tapes = NULL; static int modes_defined = FALSE; static ST_buffer *new_tape_buffer(int, int); static int enlarge_buffer(ST_buffer *, int, int); static void normalize_buffer(ST_buffer *); static int append_to_buffer(const char *, ST_buffer *, int); static int from_buffer(ST_buffer *, char *, int); static int st_init(void); static int st_attach(Scsi_Device *); static int st_detect(Scsi_Device *); static void st_detach(Scsi_Device *); struct Scsi_Device_Template st_template = {NULL, "tape", "st", NULL, TYPE_TAPE, SCSI_TAPE_MAJOR, 0, 0, 0, 0, st_detect, st_init, NULL, st_attach, st_detach}; static int st_compression(Scsi_Tape *, int); static int find_partition(struct inode *); static int update_partition(struct inode *); static int st_int_ioctl(struct inode * inode, unsigned int cmd_in, unsigned long arg); /* Convert the result to success code */ static int st_chk_result(Scsi_Cmnd * SCpnt) { int dev = TAPE_NR(SCpnt->request.rq_dev); int result = SCpnt->result; unsigned char * sense = SCpnt->sense_buffer, scode; #if DEBUG const char *stp; #endif if (!result /* && SCpnt->sense_buffer[0] == 0 */ ) return 0; if (driver_byte(result) & DRIVER_SENSE) scode = sense[2] & 0x0f; else { sense[0] = 0; /* We don't have sense data if this byte is zero */ scode = 0; } #if DEBUG if (debugging) { printk(ST_DEB_MSG "st%d: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n", dev, result, SCpnt->data_cmnd[0], SCpnt->data_cmnd[1], SCpnt->data_cmnd[2], SCpnt->data_cmnd[3], SCpnt->data_cmnd[4], SCpnt->data_cmnd[5], SCpnt->request_bufflen); if (driver_byte(result) & DRIVER_SENSE) print_sense("st", SCpnt); } else #endif if (!(driver_byte(result) & DRIVER_SENSE) || ((sense[0] & 0x70) == 0x70 && scode != NO_SENSE && scode != RECOVERED_ERROR && /* scode != UNIT_ATTENTION && */ scode != BLANK_CHECK && scode != VOLUME_OVERFLOW && SCpnt->data_cmnd[0] != MODE_SENSE && SCpnt->data_cmnd[0] != TEST_UNIT_READY)) { /* Abnormal conditions for tape */ if (driver_byte(result) & DRIVER_SENSE) { printk(KERN_WARNING "st%d: Error with sense data: ", dev); print_sense("st", SCpnt); } else printk(KERN_WARNING "st%d: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n", dev, result, suggestion(result), driver_byte(result), host_byte(result)); } if ((sense[0] & 0x70) == 0x70 && scode == RECOVERED_ERROR #if ST_RECOVERED_WRITE_FATAL && SCpnt->data_cmnd[0] != WRITE_6 && SCpnt->data_cmnd[0] != WRITE_FILEMARKS #endif ) { scsi_tapes[dev].recover_count++; scsi_tapes[dev].mt_status->mt_erreg += (1 << MT_ST_SOFTERR_SHIFT); #if DEBUG if (debugging) { if (SCpnt->data_cmnd[0] == READ_6) stp = "read"; else if (SCpnt->data_cmnd[0] == WRITE_6) stp = "write"; else stp = "ioctl"; printk(ST_DEB_MSG "st%d: Recovered %s error (%d).\n", dev, stp, scsi_tapes[dev].recover_count); } #endif if ((sense[2] & 0xe0) == 0) return 0; } return (-EIO); } /* Wakeup from interrupt */ static void st_sleep_done (Scsi_Cmnd * SCpnt) { unsigned int st_nbr; int remainder; Scsi_Tape * STp; if ((st_nbr = TAPE_NR(SCpnt->request.rq_dev)) < st_template.nr_dev) { STp = &(scsi_tapes[st_nbr]); if ((STp->buffer)->writing && (SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x40)) { /* EOM at write-behind, has all been written? */ if ((SCpnt->sense_buffer[0] & 0x80) != 0) remainder = (SCpnt->sense_buffer[3] << 24) | (SCpnt->sense_buffer[4] << 16) | (SCpnt->sense_buffer[5] << 8) | SCpnt->sense_buffer[6]; else remainder = 0; if ((SCpnt->sense_buffer[2] & 0x0f) == VOLUME_OVERFLOW || remainder > 0) (STp->buffer)->last_result = SCpnt->result; /* Error */ else (STp->buffer)->last_result = INT_MAX; /* OK */ } else (STp->buffer)->last_result = SCpnt->result; SCpnt->request.rq_status = RQ_SCSI_DONE; (STp->buffer)->last_SCpnt = SCpnt; #if DEBUG STp->write_pending = 0; #endif up(SCpnt->request.sem); } #if DEBUG else if (debugging) printk(KERN_ERR "st?: Illegal interrupt device %x\n", st_nbr); #endif } /* Do the scsi command. Waits until command performed if do_wait is true. Otherwise write_behind_check() is used to check that the command has finished. */ static Scsi_Cmnd * st_do_scsi(Scsi_Cmnd *SCpnt, Scsi_Tape *STp, unsigned char *cmd, int bytes, int timeout, int retries, int do_wait) { unsigned long flags; unsigned char *bp; spin_lock_irqsave(&io_request_lock, flags); if (SCpnt == NULL) if ((SCpnt = scsi_allocate_device(NULL, STp->device, 1)) == NULL) { printk(KERN_ERR "st%d: Can't get SCSI request.\n", TAPE_NR(STp->devt)); spin_unlock_irqrestore(&io_request_lock, flags); return NULL; } cmd[1] |= (SCpnt->lun << 5) & 0xe0; init_MUTEX_LOCKED(&STp->sem); SCpnt->use_sg = (bytes > (STp->buffer)->sg[0].length) ? (STp->buffer)->use_sg : 0; if (SCpnt->use_sg) { bp = (char *)&((STp->buffer)->sg[0]); if ((STp->buffer)->sg_segs < SCpnt->use_sg) SCpnt->use_sg = (STp->buffer)->sg_segs; } else bp = (STp->buffer)->b_data; SCpnt->cmd_len = 0; SCpnt->request.sem = &(STp->sem); SCpnt->request.rq_status = RQ_SCSI_BUSY; SCpnt->request.rq_dev = STp->devt; scsi_do_cmd(SCpnt, (void *)cmd, bp, bytes, st_sleep_done, timeout, retries); spin_unlock_irqrestore(&io_request_lock, flags); if (do_wait) { down(SCpnt->request.sem); (STp->buffer)->last_result_fatal = st_chk_result(SCpnt); } return SCpnt; } /* Handle the write-behind checking (downs the semaphore) */ static void write_behind_check(Scsi_Tape *STp) { ST_buffer * STbuffer; ST_partstat * STps; STbuffer = STp->buffer; #if DEBUG if (STp->write_pending) STp->nbr_waits++; else STp->nbr_finished++; #endif down(&(STp->sem)); (STp->buffer)->last_result_fatal = st_chk_result((STp->buffer)->last_SCpnt); scsi_release_command((STp->buffer)->last_SCpnt); if (STbuffer->writing < STbuffer->buffer_bytes) #if 0 memcpy(STbuffer->b_data, STbuffer->b_data + STbuffer->writing, STbuffer->buffer_bytes - STbuffer->writing); #else printk(KERN_WARNING "st: write_behind_check: something left in buffer!\n"); #endif STbuffer->buffer_bytes -= STbuffer->writing; STps = &(STp->ps[STp->partition]); if (STps->drv_block >= 0) { if (STp->block_size == 0) STps->drv_block++; else STps->drv_block += STbuffer->writing / STp->block_size; } STbuffer->writing = 0; return; } /* Step over EOF if it has been inadvertently crossed (ioctl not used because it messes up the block number). */ static int cross_eof(Scsi_Tape *STp, int forward) { Scsi_Cmnd *SCpnt; unsigned char cmd[10]; cmd[0] = SPACE; cmd[1] = 0x01; /* Space FileMarks */ if (forward) { cmd[2] = cmd[3] = 0; cmd[4] = 1; } else cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ cmd[5] = 0; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Stepping over filemark %s.\n", TAPE_NR(STp->devt), forward ? "forward" : "backward"); #endif SCpnt = st_do_scsi(NULL, STp, cmd, 0, STp->timeout, MAX_RETRIES, TRUE); if (!SCpnt) return (-EBUSY); scsi_release_command(SCpnt); SCpnt = NULL; if ((STp->buffer)->last_result != 0) printk(KERN_ERR "st%d: Stepping over filemark %s failed.\n", TAPE_NR(STp->devt), forward ? "forward" : "backward"); return (STp->buffer)->last_result_fatal; } /* Flush the write buffer (never need to write if variable blocksize). */ static int flush_write_buffer(Scsi_Tape *STp) { int offset, transfer, blks; int result; unsigned char cmd[10]; Scsi_Cmnd *SCpnt; ST_partstat * STps; if ((STp->buffer)->writing) { write_behind_check(STp); if ((STp->buffer)->last_result_fatal) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Async write error (flush) %x.\n", TAPE_NR(STp->devt), (STp->buffer)->last_result); #endif if ((STp->buffer)->last_result == INT_MAX) return (-ENOSPC); return (-EIO); } } if (STp->block_size == 0) return 0; result = 0; if (STp->dirty == 1) { offset = (STp->buffer)->buffer_bytes; transfer = ((offset + STp->block_size - 1) / STp->block_size) * STp->block_size; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Flushing %d bytes.\n", TAPE_NR(STp->devt), transfer); #endif memset((STp->buffer)->b_data + offset, 0, transfer - offset); memset(cmd, 0, 10); cmd[0] = WRITE_6; cmd[1] = 1; blks = transfer / STp->block_size; cmd[2] = blks >> 16; cmd[3] = blks >> 8; cmd[4] = blks; SCpnt = st_do_scsi(NULL, STp, cmd, transfer, STp->timeout, MAX_WRITE_RETRIES, TRUE); if (!SCpnt) return (-EBUSY); STps = &(STp->ps[STp->partition]); if ((STp->buffer)->last_result_fatal != 0) { if ((SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x40) && (SCpnt->sense_buffer[2] & 0x0f) == NO_SENSE) { STp->dirty = 0; (STp->buffer)->buffer_bytes = 0; result = (-ENOSPC); } else { printk(KERN_ERR "st%d: Error on flush.\n", TAPE_NR(STp->devt)); result = (-EIO); } STps->drv_block = (-1); } else { if (STps->drv_block >= 0) STps->drv_block += blks; STp->dirty = 0; (STp->buffer)->buffer_bytes = 0; } scsi_release_command(SCpnt); SCpnt = NULL; } return result; } /* Flush the tape buffer. The tape will be positioned correctly unless seek_next is true. */ static int flush_buffer(struct inode * inode, struct file * filp, int seek_next) { int backspace, result; Scsi_Tape * STp; ST_buffer * STbuffer; ST_partstat * STps; int dev = TAPE_NR(inode->i_rdev); STp = &(scsi_tapes[dev]); STbuffer = STp->buffer; /* * If there was a bus reset, block further access * to this device. */ if( STp->device->was_reset ) return (-EIO); if (STp->ready != ST_READY) return 0; STps = &(STp->ps[STp->partition]); if (STps->rw == ST_WRITING) /* Writing */ return flush_write_buffer(STp); if (STp->block_size == 0) return 0; backspace = ((STp->buffer)->buffer_bytes + (STp->buffer)->read_pointer) / STp->block_size - ((STp->buffer)->read_pointer + STp->block_size - 1) / STp->block_size; (STp->buffer)->buffer_bytes = 0; (STp->buffer)->read_pointer = 0; result = 0; if (!seek_next) { if (STps->eof == ST_FM_HIT) { result = cross_eof(STp, FALSE); /* Back over the EOF hit */ if (!result) STps->eof = ST_NOEOF; else { if (STps->drv_file >= 0) STps->drv_file++; STps->drv_block = 0; } } if (!result && backspace > 0) result = st_int_ioctl(inode, MTBSR, backspace); } else if (STps->eof == ST_FM_HIT) { if (STps->drv_file >= 0) STps->drv_file++; STps->drv_block = 0; STps->eof = ST_NOEOF; } return result; } /* Set the mode parameters */ static int set_mode_densblk(struct inode * inode, Scsi_Tape *STp, ST_mode *STm) { int set_it = FALSE; unsigned long arg; int dev = TAPE_NR(inode->i_rdev); if (!STp->density_changed && STm->default_density >= 0 && STm->default_density != STp->density) { arg = STm->default_density; set_it = TRUE; } else arg = STp->density; arg <<= MT_ST_DENSITY_SHIFT; if (!STp->blksize_changed && STm->default_blksize >= 0 && STm->default_blksize != STp->block_size) { arg |= STm->default_blksize; set_it = TRUE; } else arg |= STp->block_size; if (set_it && st_int_ioctl(inode, SET_DENS_AND_BLK, arg)) { printk(KERN_WARNING "st%d: Can't set default block size to %d bytes and density %x.\n", dev, STm->default_blksize, STm->default_density); if (modes_defined) return (-EINVAL); } return 0; } /* Open the device */ static int scsi_tape_open(struct inode * inode, struct file * filp) { unsigned short flags; int i, need_dma_buffer, new_session = FALSE; unsigned char cmd[10]; Scsi_Cmnd * SCpnt; Scsi_Tape * STp; ST_mode * STm; ST_partstat * STps; int dev = TAPE_NR(inode->i_rdev); int mode = TAPE_MODE(inode->i_rdev); if (dev >= st_template.dev_max || !scsi_tapes[dev].device) return (-ENXIO); if( !scsi_block_when_processing_errors(scsi_tapes[dev].device) ) { return -ENXIO; } STp = &(scsi_tapes[dev]); if (STp->in_use) { #if DEBUG printk(ST_DEB_MSG "st%d: Device already in use.\n", dev); #endif return (-EBUSY); } STp->rew_at_close = (MINOR(inode->i_rdev) & 0x80) == 0; if (mode != STp->current_mode) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Mode change from %d to %d.\n", dev, STp->current_mode, mode); #endif new_session = TRUE; STp->current_mode = mode; } STm = &(STp->modes[STp->current_mode]); /* Allocate a buffer for this user */ need_dma_buffer = STp->restr_dma; for (i=0; i < st_nbr_buffers; i++) if (!st_buffers[i]->in_use && (!need_dma_buffer || st_buffers[i]->dma)) break; if (i >= st_nbr_buffers) { STp->buffer = new_tape_buffer(FALSE, need_dma_buffer); if (STp->buffer == NULL) { printk(KERN_WARNING "st%d: Can't allocate tape buffer.\n", dev); return (-EBUSY); } } else STp->buffer = st_buffers[i]; (STp->buffer)->in_use = 1; (STp->buffer)->writing = 0; (STp->buffer)->last_result_fatal = 0; (STp->buffer)->use_sg = STp->device->host->sg_tablesize; /* Compute the usable buffer size for this SCSI adapter */ if (!(STp->buffer)->use_sg) (STp->buffer)->buffer_size = (STp->buffer)->sg[0].length; else { for (i=0, (STp->buffer)->buffer_size = 0; i < (STp->buffer)->use_sg && i < (STp->buffer)->sg_segs; i++) (STp->buffer)->buffer_size += (STp->buffer)->sg[i].length; } flags = filp->f_flags; STp->write_prot = ((flags & O_ACCMODE) == O_RDONLY); STp->dirty = 0; for (i=0; i < ST_NBR_PARTITIONS; i++) { STps = &(STp->ps[i]); STps->rw = ST_IDLE; } STp->ready = ST_READY; STp->recover_count = 0; #if DEBUG STp->nbr_waits = STp->nbr_finished = 0; #endif if (scsi_tapes[dev].device->host->hostt->module) __MOD_INC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_INC_USE_COUNT(st_template.module); memset ((void *) &cmd[0], 0, 10); cmd[0] = TEST_UNIT_READY; SCpnt = st_do_scsi(NULL, STp, cmd, 0, STp->long_timeout, MAX_READY_RETRIES, TRUE); if (!SCpnt) { if (scsi_tapes[dev].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_DEC_USE_COUNT(st_template.module); return (-EBUSY); } if ((SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */ memset ((void *) &cmd[0], 0, 10); cmd[0] = TEST_UNIT_READY; SCpnt = st_do_scsi(SCpnt, STp, cmd, 0, STp->long_timeout, MAX_READY_RETRIES, TRUE); (STp->device)->was_reset = 0; STp->partition = STp->new_partition = 0; if (STp->can_partitions) STp->nbr_partitions = 1; /* This guess will be updated later if necessary */ for (i=0; i < ST_NBR_PARTITIONS; i++) { STps = &(STp->ps[i]); STps->rw = ST_IDLE; STps->eof = ST_NOEOF; STps->at_sm = 0; STps->last_block_valid = FALSE; STps->drv_block = 0; STps->drv_file = 0 ; } new_session = TRUE; } if ((STp->buffer)->last_result_fatal != 0) { if ((STp->device)->scsi_level >= SCSI_2 && (SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x0f) == NOT_READY && SCpnt->sense_buffer[12] == 0x3a) { /* Check ASC */ STp->ready = ST_NO_TAPE; } else STp->ready = ST_NOT_READY; scsi_release_command(SCpnt); SCpnt = NULL; STp->density = 0; /* Clear the erroneous "residue" */ STp->write_prot = 0; STp->block_size = 0; STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); STp->partition = STp->new_partition = 0; STp->door_locked = ST_UNLOCKED; STp->in_use = 1; return 0; } if (STp->omit_blklims) STp->min_block = STp->max_block = (-1); else { memset ((void *) &cmd[0], 0, 10); cmd[0] = READ_BLOCK_LIMITS; SCpnt = st_do_scsi(SCpnt, STp, cmd, 6, STp->timeout, MAX_READY_RETRIES, TRUE); if (!SCpnt->result && !SCpnt->sense_buffer[0]) { STp->max_block = ((STp->buffer)->b_data[1] << 16) | ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; STp->min_block = ((STp->buffer)->b_data[4] << 8) | (STp->buffer)->b_data[5]; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Block limits %d - %d bytes.\n", dev, STp->min_block, STp->max_block); #endif } else { STp->min_block = STp->max_block = (-1); #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Can't read block limits.\n", dev); #endif } } memset ((void *) &cmd[0], 0, 10); cmd[0] = MODE_SENSE; cmd[4] = 12; SCpnt = st_do_scsi(SCpnt, STp, cmd, 12, STp->timeout, MAX_READY_RETRIES, TRUE); if ((STp->buffer)->last_result_fatal != 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: No Mode Sense.\n", dev); #endif STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ (STp->buffer)->last_result_fatal = 0; /* Prevent error propagation */ STp->drv_write_prot = 0; } else { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Mode sense. Length %d, medium %x, WBS %x, BLL %d\n", dev, (STp->buffer)->b_data[0], (STp->buffer)->b_data[1], (STp->buffer)->b_data[2], (STp->buffer)->b_data[3]); #endif if ((STp->buffer)->b_data[3] >= 8) { STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; STp->density = (STp->buffer)->b_data[4]; STp->block_size = (STp->buffer)->b_data[9] * 65536 + (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Density %x, tape length: %x, drv buffer: %d\n", dev, STp->density, (STp->buffer)->b_data[5] * 65536 + (STp->buffer)->b_data[6] * 256 + (STp->buffer)->b_data[7], STp->drv_buffer); #endif } if (STp->block_size > (STp->buffer)->buffer_size && !enlarge_buffer(STp->buffer, STp->block_size, STp->restr_dma)) { printk(KERN_NOTICE "st%d: Blocksize %d too large for buffer.\n", dev, STp->block_size); scsi_release_command(SCpnt); (STp->buffer)->in_use = 0; STp->buffer = NULL; if (scsi_tapes[dev].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_DEC_USE_COUNT(st_template.module); return (-EIO); } STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; } scsi_release_command(SCpnt); SCpnt = NULL; if (STp->block_size > 0) (STp->buffer)->buffer_blocks = (STp->buffer)->buffer_size / STp->block_size; else (STp->buffer)->buffer_blocks = 1; (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Block size: %d, buffer size: %d (%d blocks).\n", dev, STp->block_size, (STp->buffer)->buffer_size, (STp->buffer)->buffer_blocks); #endif if (STp->drv_write_prot) { STp->write_prot = 1; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Write protected\n", dev); #endif if ((flags & O_ACCMODE) == O_WRONLY || (flags & O_ACCMODE) == O_RDWR) { (STp->buffer)->in_use = 0; STp->buffer = NULL; if (scsi_tapes[dev].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_DEC_USE_COUNT(st_template.module); return (-EROFS); } } if (STp->can_partitions && STp->nbr_partitions < 1) { /* This code is reached when the device is opened for the first time after the driver has been initialized with tape in the drive and the partition support has been enabled. */ #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Updating partition number in status.\n", dev); #endif if ((STp->partition = find_partition(inode)) < 0) { (STp->buffer)->in_use = 0; STp->buffer = NULL; if (scsi_tapes[dev].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_DEC_USE_COUNT(st_template.module); return STp->partition; } STp->new_partition = STp->partition; STp->nbr_partitions = 1; /* This guess will be updated when necessary */ } if (new_session) { /* Change the drive parameters for the new mode */ STp->density_changed = STp->blksize_changed = FALSE; STp->compression_changed = FALSE; if (!(STm->defaults_for_writes) && (i = set_mode_densblk(inode, STp, STm)) < 0) { (STp->buffer)->in_use = 0; STp->buffer = NULL; if (scsi_tapes[dev].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_DEC_USE_COUNT(st_template.module); return i; } if (STp->default_drvbuffer != 0xff) { if (st_int_ioctl(inode, MTSETDRVBUFFER, STp->default_drvbuffer)) printk(KERN_WARNING "st%d: Can't set default drive buffering to %d.\n", dev, STp->default_drvbuffer); } } STp->in_use = 1; return 0; } /* Flush the tape buffer before close */ static int scsi_tape_flush(struct file * filp) { int result = 0, result2; static unsigned char cmd[10]; Scsi_Cmnd * SCpnt; Scsi_Tape * STp; ST_mode * STm; ST_partstat * STps; struct inode *inode = filp->f_dentry->d_inode; kdev_t devt = inode->i_rdev; int dev; if (filp->f_count > 1) return 0; dev = TAPE_NR(devt); STp = &(scsi_tapes[dev]); STm = &(STp->modes[STp->current_mode]); STps = &(STp->ps[STp->partition]); if (STp->can_partitions && (result = update_partition(inode)) < 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: update_partition at close failed.\n", dev); #endif goto out; } if ( STps->rw == ST_WRITING && !(STp->device)->was_reset) { result = flush_write_buffer(STp); #if DEBUG if (debugging) { printk(ST_DEB_MSG "st%d: File length %ld bytes.\n", dev, (long)(filp->f_pos)); printk(ST_DEB_MSG "st%d: Async write waits %d, finished %d.\n", dev, STp->nbr_waits, STp->nbr_finished); } #endif if (result == 0 || result == (-ENOSPC)) { memset(cmd, 0, 10); cmd[0] = WRITE_FILEMARKS; cmd[4] = 1 + STp->two_fm; SCpnt = st_do_scsi(NULL, STp, cmd, 0, STp->timeout, MAX_WRITE_RETRIES, TRUE); if (!SCpnt) goto out; if ((STp->buffer)->last_result_fatal != 0 && ((SCpnt->sense_buffer[0] & 0x70) != 0x70 || (SCpnt->sense_buffer[2] & 0x4f) != 0x40 || ((SCpnt->sense_buffer[0] & 0x80) != 0 && (SCpnt->sense_buffer[3] | SCpnt->sense_buffer[4] | SCpnt->sense_buffer[5] | SCpnt->sense_buffer[6]) == 0))) { /* Filter out successful write at EOM */ scsi_release_command(SCpnt); SCpnt = NULL; printk(KERN_ERR "st%d: Error on write filemark.\n", dev); if (result == 0) result = (-EIO); } else { scsi_release_command(SCpnt); SCpnt = NULL; if (STps->drv_file >= 0) STps->drv_file++ ; STps->drv_block = 0; if (STp->two_fm) cross_eof(STp, FALSE); STps->eof = ST_FM; } } #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Buffer flushed, %d EOF(s) written\n", dev, cmd[4]); #endif } else if (!STp->rew_at_close) { STps = &(STp->ps[STp->partition]); if (!STm->sysv || STps->rw != ST_READING) { if (STp->can_bsr) result = flush_buffer(inode, filp, 0); else if (STps->eof == ST_FM_HIT) { result = cross_eof(STp, FALSE); if (result) { if (STps->drv_file >= 0) STps->drv_file++; STps->drv_block = 0; STps->eof = ST_FM; } else STps->eof = ST_NOEOF; } } else if ((STps->eof == ST_NOEOF && !(result = cross_eof(STp, TRUE))) || STps->eof == ST_FM_HIT) { if (STps->drv_file >= 0) STps->drv_file++; STps->drv_block = 0; STps->eof = ST_FM; } } out: if (STp->rew_at_close) { result2 = st_int_ioctl(inode, MTREW, 1); if (result == 0) result = result2; } return result; } /* Close the device and release it */ static int scsi_tape_close(struct inode * inode, struct file * filp) { int result = 0; Scsi_Tape * STp; kdev_t devt = inode->i_rdev; int dev; dev = TAPE_NR(devt); STp = &(scsi_tapes[dev]); if (STp->door_locked == ST_LOCKED_AUTO) st_int_ioctl(inode, MTUNLOCK, 0); if (STp->buffer != NULL) { normalize_buffer(STp->buffer); (STp->buffer)->in_use = 0; } STp->in_use = 0; if (scsi_tapes[dev].device->host->hostt->module) __MOD_DEC_USE_COUNT(scsi_tapes[dev].device->host->hostt->module); if(st_template.module) __MOD_DEC_USE_COUNT(st_template.module); return result; } /* Write command */ static ssize_t st_write(struct file * filp, const char * buf, size_t count, loff_t *ppos) { struct inode *inode = filp->f_dentry->d_inode; ssize_t total; ssize_t i, do_count, blks, retval, transfer; int write_threshold; int doing_write = 0; static unsigned char cmd[10]; const char *b_point; Scsi_Cmnd * SCpnt = NULL; Scsi_Tape * STp; ST_mode * STm; ST_partstat * STps; int dev = TAPE_NR(inode->i_rdev); STp = &(scsi_tapes[dev]); /* * 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(STp->device) ) { return -ENXIO; } if (ppos != &filp->f_pos) { /* "A request was outside the capabilities of the device." */ return -ENXIO; } if (STp->ready != ST_READY) { if (STp->ready == ST_NO_TAPE) return (-ENOMEDIUM); else return (-EIO); } STm = &(STp->modes[STp->current_mode]); if (!STm->defined) return (-ENXIO); if (count == 0) return 0; /* * If there was a bus reset, block further access * to this device. */ if( STp->device->was_reset ) return (-EIO); #if DEBUG if (!STp->in_use) { printk(ST_DEB_MSG "st%d: Incorrect device.\n", dev); return (-EIO); } #endif /* Write must be integral number of blocks */ if (STp->block_size != 0 && (count % STp->block_size) != 0) { printk(KERN_WARNING "st%d: Write not multiple of tape block size.\n", dev); return (-EIO); } if (STp->can_partitions && (retval = update_partition(inode)) < 0) return retval; STps = &(STp->ps[STp->partition]); if (STp->write_prot) return (-EACCES); if (STp->block_size == 0 && count > (STp->buffer)->buffer_size && !enlarge_buffer(STp->buffer, count, STp->restr_dma)) return (-EOVERFLOW); if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && !st_int_ioctl(inode, MTLOCK, 0)) STp->door_locked = ST_LOCKED_AUTO; if (STps->rw == ST_READING) { retval = flush_buffer(inode, filp, 0); if (retval) return retval; STps->rw = ST_WRITING; } else if (STps->rw != ST_WRITING && STps->drv_file == 0 && STps->drv_block == 0) { if ((retval = set_mode_densblk(inode, STp, STm)) < 0) return retval; if (STm->default_compression != ST_DONT_TOUCH && !(STp->compression_changed)) { if (st_compression(STp, (STm->default_compression == ST_YES))) { printk(KERN_WARNING "st%d: Can't set default compression.\n", dev); if (modes_defined) return (-EINVAL); } } } if ((STp->buffer)->writing) { write_behind_check(STp); if ((STp->buffer)->last_result_fatal) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Async write error (write) %x.\n", dev, (STp->buffer)->last_result); #endif if ((STp->buffer)->last_result == INT_MAX) STps->eof = ST_EOM_OK; else STps->eof = ST_EOM_ERROR; } } if (STps->eof == ST_EOM_OK) return (-ENOSPC); else if (STps->eof == ST_EOM_ERROR) return (-EIO); /* Check the buffer readability in cases where copy_user might catch the problems after some tape movement. */ if (STp->block_size != 0 && (copy_from_user(&i, buf, 1) != 0 || copy_from_user(&i, buf + count - 1, 1) != 0)) return (-EFAULT); if (!STm->do_buffer_writes) { #if 0 if (STp->block_size != 0 && (count % STp->block_size) != 0) return (-EIO); /* Write must be integral number of blocks */ #endif write_threshold = 1; } else write_threshold = (STp->buffer)->buffer_blocks * STp->block_size; if (!STm->do_async_writes) write_threshold--; total = count; memset(cmd, 0, 10); cmd[0] = WRITE_6; cmd[1] = (STp->block_size != 0); STps->rw = ST_WRITING; b_point = buf; while ((STp->block_size == 0 && !STm->do_async_writes && count > 0) || (STp->block_size != 0 && (STp->buffer)->buffer_bytes + count > write_threshold)) { doing_write = 1; if (STp->block_size == 0) do_count = count; else { do_count = (STp->buffer)->buffer_blocks * STp->block_size - (STp->buffer)->buffer_bytes; if (do_count > count) do_count = count; } i = append_to_buffer(b_point, STp->buffer, do_count); if (i) { if (SCpnt != NULL) { scsi_release_command(SCpnt); SCpnt = NULL; } return i; } if (STp->block_size == 0) blks = transfer = do_count; else { blks = (STp->buffer)->buffer_bytes / STp->block_size; transfer = blks * STp->block_size; } cmd[2] = blks >> 16; cmd[3] = blks >> 8; cmd[4] = blks; SCpnt = st_do_scsi(SCpnt, STp, cmd, transfer, STp->timeout, MAX_WRITE_RETRIES, TRUE); if (!SCpnt) return (-EBUSY); if ((STp->buffer)->last_result_fatal != 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Error on write:\n", dev); #endif if ((SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x40)) { if (STp->block_size != 0 && (SCpnt->sense_buffer[0] & 0x80) != 0) transfer = (SCpnt->sense_buffer[3] << 24) | (SCpnt->sense_buffer[4] << 16) | (SCpnt->sense_buffer[5] << 8) | SCpnt->sense_buffer[6]; else if (STp->block_size == 0 && (SCpnt->sense_buffer[2] & 0x0f) == VOLUME_OVERFLOW) transfer = do_count; else transfer = 0; if (STp->block_size != 0) transfer *= STp->block_size; if (transfer <= do_count) { filp->f_pos += do_count - transfer; count -= do_count - transfer; if (STps->drv_block >= 0) { if (STp->block_size == 0 && transfer < do_count) STps->drv_block++; else if (STp->block_size != 0) STps->drv_block += (do_count - transfer) / STp->block_size; } STps->eof = ST_EOM_OK; retval = (-ENOSPC); /* EOM within current request */ #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: EOM with %d bytes unwritten.\n", dev, transfer); #endif } else { STps->eof = ST_EOM_ERROR; STps->drv_block = (-1); /* Too cautious? */ retval = (-EIO); /* EOM for old data */ #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: EOM with lost data.\n", dev); #endif } } else { STps->drv_block = (-1); /* Too cautious? */ retval = (-EIO); } scsi_release_command(SCpnt); SCpnt = NULL; (STp->buffer)->buffer_bytes = 0; STp->dirty = 0; if (count < total) return total - count; else return retval; } filp->f_pos += do_count; b_point += do_count; count -= do_count; if (STps->drv_block >= 0) { if (STp->block_size == 0) STps->drv_block++; else STps->drv_block += blks; } (STp->buffer)->buffer_bytes = 0; STp->dirty = 0; } if (count != 0) { STp->dirty = 1; i = append_to_buffer(b_point, STp->buffer, count); if (i) { if (SCpnt != NULL) { scsi_release_command(SCpnt); SCpnt = NULL; } return i; } filp->f_pos += count; count = 0; } if (doing_write && (STp->buffer)->last_result_fatal != 0) { scsi_release_command(SCpnt); SCpnt = NULL; return (STp->buffer)->last_result_fatal; } if (STm->do_async_writes && (((STp->buffer)->buffer_bytes >= STp->write_threshold && (STp->buffer)->buffer_bytes >= STp->block_size) || STp->block_size == 0) ) { /* Schedule an asynchronous write */ if (STp->block_size == 0) (STp->buffer)->writing = (STp->buffer)->buffer_bytes; else (STp->buffer)->writing = ((STp->buffer)->buffer_bytes / STp->block_size) * STp->block_size; STp->dirty = !((STp->buffer)->writing == (STp->buffer)->buffer_bytes); if (STp->block_size == 0) blks = (STp->buffer)->writing; else blks = (STp->buffer)->writing / STp->block_size; cmd[2] = blks >> 16; cmd[3] = blks >> 8; cmd[4] = blks; #if DEBUG STp->write_pending = 1; #endif SCpnt = st_do_scsi(SCpnt, STp, cmd, (STp->buffer)->writing, STp->timeout, MAX_WRITE_RETRIES, FALSE); if (SCpnt == NULL) return (-EIO); } else if (SCpnt != NULL) { scsi_release_command(SCpnt); SCpnt = NULL; } STps->at_sm &= (total == 0); if (total > 0) STps->eof = ST_NOEOF; return( total); } /* Read data from the tape. Returns zero in the normal case, one if the eof status has changed, and the negative error code in case of a fatal error. Otherwise updates the buffer and the eof state. */ static long read_tape(struct inode *inode, long count, Scsi_Cmnd **aSCpnt) { int transfer, blks, bytes; static unsigned char cmd[10]; Scsi_Cmnd *SCpnt; Scsi_Tape *STp; ST_mode * STm; ST_partstat * STps; int dev = TAPE_NR(inode->i_rdev); int retval = 0; if (count == 0) return 0; STp = &(scsi_tapes[dev]); STm = &(STp->modes[STp->current_mode]); STps = &(STp->ps[STp->partition]); if (STps->eof == ST_FM_HIT) return 1; memset(cmd, 0, 10); cmd[0] = READ_6; cmd[1] = (STp->block_size != 0); if (STp->block_size == 0) blks = bytes = count; else { if (STm->do_read_ahead) { blks = (STp->buffer)->buffer_blocks; bytes = blks * STp->block_size; } else { bytes = count; if (bytes > (STp->buffer)->buffer_size) bytes = (STp->buffer)->buffer_size; blks = bytes / STp->block_size; bytes = blks * STp->block_size; } } cmd[2] = blks >> 16; cmd[3] = blks >> 8; cmd[4] = blks; SCpnt = *aSCpnt; SCpnt = st_do_scsi(SCpnt, STp, cmd, bytes, STp->timeout, MAX_RETRIES, TRUE); *aSCpnt = SCpnt; if (!SCpnt) return (-EBUSY); (STp->buffer)->read_pointer = 0; STps->at_sm = 0; /* Something to check */ if ((STp->buffer)->last_result_fatal) { retval = 1; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", dev, SCpnt->sense_buffer[0], SCpnt->sense_buffer[1], SCpnt->sense_buffer[2], SCpnt->sense_buffer[3], SCpnt->sense_buffer[4], SCpnt->sense_buffer[5], SCpnt->sense_buffer[6], SCpnt->sense_buffer[7]); #endif if ((SCpnt->sense_buffer[0] & 0x70) == 0x70) { /* extended sense */ if ((SCpnt->sense_buffer[2] & 0x0f) == BLANK_CHECK) SCpnt->sense_buffer[2] &= 0xcf; /* No need for EOM in this case */ if ((SCpnt->sense_buffer[2] & 0xe0) != 0) { /* EOF, EOM, or ILI */ /* Compute the residual count */ if ((SCpnt->sense_buffer[0] & 0x80) != 0) transfer = (SCpnt->sense_buffer[3] << 24) | (SCpnt->sense_buffer[4] << 16) | (SCpnt->sense_buffer[5] << 8) | SCpnt->sense_buffer[6]; else transfer = 0; if (STp->block_size == 0 && (SCpnt->sense_buffer[2] & 0x0f) == MEDIUM_ERROR) transfer = bytes; if (SCpnt->sense_buffer[2] & 0x20) { /* ILI */ if (STp->block_size == 0) { if (transfer <= 0) transfer = 0; (STp->buffer)->buffer_bytes = bytes - transfer; } else { scsi_release_command(SCpnt); SCpnt = *aSCpnt = NULL; if (transfer == blks) { /* We did not get anything, error */ printk(KERN_NOTICE "st%d: Incorrect block size.\n", dev); if (STps->drv_block >= 0) STps->drv_block += blks - transfer + 1; st_int_ioctl(inode, MTBSR, 1); return (-EIO); } /* We have some data, deliver it */ (STp->buffer)->buffer_bytes = (blks - transfer) * STp->block_size; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: ILI but enough data received %ld %d.\n", dev, count, (STp->buffer)->buffer_bytes); #endif if (STps->drv_block >= 0) STps->drv_block += 1; if (st_int_ioctl(inode, MTBSR, 1)) return (-EIO); } } else if (SCpnt->sense_buffer[2] & 0x80) { /* FM overrides EOM */ if (STps->eof != ST_FM_HIT) STps->eof = ST_FM_HIT; else STps->eof = ST_EOD_2; if (STp->block_size == 0) (STp->buffer)->buffer_bytes = 0; else (STp->buffer)->buffer_bytes = bytes - transfer * STp->block_size; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: EOF detected (%d bytes read).\n", dev, (STp->buffer)->buffer_bytes); #endif } else if (SCpnt->sense_buffer[2] & 0x40) { if (STps->eof == ST_FM) STps->eof = ST_EOD_1; else STps->eof = ST_EOM_OK; if (STp->block_size == 0) (STp->buffer)->buffer_bytes = bytes - transfer; else (STp->buffer)->buffer_bytes = bytes - transfer * STp->block_size; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: EOM detected (%d bytes read).\n", dev, (STp->buffer)->buffer_bytes); #endif } } /* end of EOF, EOM, ILI test */ else { /* nonzero sense key */ #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Tape error while reading.\n", dev); #endif STps->drv_block = (-1); if (STps->eof == ST_FM && (SCpnt->sense_buffer[2] & 0x0f) == BLANK_CHECK) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Zero returned for first BLANK CHECK after EOF.\n", dev); #endif STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ } else /* Some other extended sense code */ retval = (-EIO); } } /* End of extended sense test */ else { /* Non-extended sense */ retval = (STp->buffer)->last_result_fatal; } } /* End of error handling */ else /* Read successful */ (STp->buffer)->buffer_bytes = bytes; if (STps->drv_block >= 0) { if (STp->block_size == 0) STps->drv_block++; else STps->drv_block += (STp->buffer)->buffer_bytes / STp->block_size; } return retval; } /* Read command */ static ssize_t st_read(struct file * filp, char * buf, size_t count, loff_t *ppos) { struct inode * inode = filp->f_dentry->d_inode; ssize_t total; ssize_t i, transfer; int special; Scsi_Cmnd * SCpnt = NULL; Scsi_Tape * STp; ST_mode * STm; ST_partstat * STps; int dev = TAPE_NR(inode->i_rdev); STp = &(scsi_tapes[dev]); /* * 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(STp->device) ) { return -ENXIO; } if (ppos != &filp->f_pos) { /* "A request was outside the capabilities of the device." */ return -ENXIO; } if (STp->ready != ST_READY) { if (STp->ready == ST_NO_TAPE) return (-ENOMEDIUM); else return (-EIO); } STm = &(STp->modes[STp->current_mode]); if (!STm->defined) return (-ENXIO); #if DEBUG if (!STp->in_use) { printk(ST_DEB_MSG "st%d: Incorrect device.\n", dev); return (-EIO); } #endif if (STp->can_partitions && (total = update_partition(inode)) < 0) return total; if (STp->block_size == 0 && count > (STp->buffer)->buffer_size && !enlarge_buffer(STp->buffer, count, STp->restr_dma)) return (-EOVERFLOW); if (!(STm->do_read_ahead) && STp->block_size != 0 && (count % STp->block_size) != 0) return (-EIO); /* Read must be integral number of blocks */ if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && !st_int_ioctl(inode, MTLOCK, 0)) STp->door_locked = ST_LOCKED_AUTO; STps = &(STp->ps[STp->partition]); if (STps->rw == ST_WRITING) { transfer = flush_buffer(inode, filp, 0); if (transfer) return transfer; STps->rw = ST_READING; } #if DEBUG if (debugging && STps->eof != ST_NOEOF) printk(ST_DEB_MSG "st%d: EOF/EOM flag up (%d). Bytes %d\n", dev, STps->eof, (STp->buffer)->buffer_bytes); #endif if ((STp->buffer)->buffer_bytes == 0 && STps->eof >= ST_EOD_1) { if (STps->eof < ST_EOD) { STps->eof += 1; return 0; } return (-EIO); /* EOM or Blank Check */ } /* Check the buffer writability before any tape movement. Don't alter buffer data. */ if (copy_from_user(&i, buf, 1) != 0 || copy_to_user(buf, &i, 1) != 0 || copy_from_user(&i, buf + count - 1, 1) != 0 || copy_to_user(buf + count - 1, &i, 1) != 0) return (-EFAULT); STps->rw = ST_READING; /* Loop until enough data in buffer or a special condition found */ for (total = 0, special = 0; total < count && !special; ) { /* Get new data if the buffer is empty */ if ((STp->buffer)->buffer_bytes == 0) { special = read_tape(inode, count - total, &SCpnt); if (special < 0) { /* No need to continue read */ if (SCpnt != NULL) { scsi_release_command(SCpnt); } return special; } } /* Move the data from driver buffer to user buffer */ if ((STp->buffer)->buffer_bytes > 0) { #if DEBUG if (debugging && STps->eof != ST_NOEOF) printk(ST_DEB_MSG "st%d: EOF up (%d). Left %d, needed %d.\n", dev, STps->eof, (STp->buffer)->buffer_bytes, count - total); #endif transfer = (STp->buffer)->buffer_bytes < count - total ? (STp->buffer)->buffer_bytes : count - total; i = from_buffer(STp->buffer, buf, transfer); if (i) { if (SCpnt != NULL) { scsi_release_command(SCpnt); SCpnt = NULL; } return i; } filp->f_pos += transfer; buf += transfer; total += transfer; } if (STp->block_size == 0) break; /* Read only one variable length block */ } /* for (total = 0, special = 0; total < count && !special; ) */ if (SCpnt != NULL) { scsi_release_command(SCpnt); SCpnt = NULL; } /* Change the eof state if no data from tape or buffer */ if (total == 0) { if (STps->eof == ST_FM_HIT) { STps->eof = ST_FM; STps->drv_block = 0; if (STps->drv_file >= 0) STps->drv_file++; } else if (STps->eof == ST_EOD_1) { STps->eof = ST_EOD_2; STps->drv_block = 0; if (STps->drv_file >= 0) STps->drv_file++; } else if (STps->eof == ST_EOD_2) STps->eof = ST_EOD; } else if (STps->eof == ST_FM) STps->eof = ST_NOEOF; return total; } /* Set the driver options */ static void st_log_options(Scsi_Tape *STp, ST_mode *STm, int dev) { printk(KERN_INFO "st%d: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", dev, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, STm->do_read_ahead); printk(KERN_INFO "st%d: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", dev, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); printk(KERN_INFO "st%d: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", dev, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, STp->scsi2_logical); printk(KERN_INFO "st%d: sysv: %d\n", dev, STm->sysv); #if DEBUG printk(KERN_INFO "st%d: debugging: %d\n", dev, debugging); #endif } static int st_set_options(struct inode * inode, long options) { int value; long code; Scsi_Tape *STp; ST_mode *STm; int dev = TAPE_NR(inode->i_rdev); STp = &(scsi_tapes[dev]); STm = &(STp->modes[STp->current_mode]); if (!STm->defined) { memcpy(STm, &(STp->modes[0]), sizeof(ST_mode)); modes_defined = TRUE; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Initialized mode %d definition from mode 0\n", dev, STp->current_mode); #endif } code = options & MT_ST_OPTIONS; if (code == MT_ST_BOOLEANS) { STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; STp->two_fm = (options & MT_ST_TWO_FM) != 0; STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; if ((STp->device)->scsi_level >= SCSI_2) STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; STm->sysv = (options & MT_ST_SYSV) != 0; #if DEBUG debugging = (options & MT_ST_DEBUGGING) != 0; #endif st_log_options(STp, STm, dev); } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { value = (code == MT_ST_SETBOOLEANS); if ((options & MT_ST_BUFFER_WRITES) != 0) STm->do_buffer_writes = value; if ((options & MT_ST_ASYNC_WRITES) != 0) STm->do_async_writes = value; if ((options & MT_ST_DEF_WRITES) != 0) STm->defaults_for_writes = value; if ((options & MT_ST_READ_AHEAD) != 0) STm->do_read_ahead = value; if ((options & MT_ST_TWO_FM) != 0) STp->two_fm = value; if ((options & MT_ST_FAST_MTEOM) != 0) STp->fast_mteom = value; if ((options & MT_ST_AUTO_LOCK) != 0) STp->do_auto_lock = value; if ((options & MT_ST_CAN_BSR) != 0) STp->can_bsr = value; if ((options & MT_ST_NO_BLKLIMS) != 0) STp->omit_blklims = value; if ((STp->device)->scsi_level >= SCSI_2 && (options & MT_ST_CAN_PARTITIONS) != 0) STp->can_partitions = value; if ((options & MT_ST_SCSI2LOGICAL) != 0) STp->scsi2_logical = value; if ((options & MT_ST_SYSV) != 0) STm->sysv = value; #if DEBUG if ((options & MT_ST_DEBUGGING) != 0) debugging = value; #endif st_log_options(STp, STm, dev); } else if (code == MT_ST_WRITE_THRESHOLD) { value = (options & ~MT_ST_OPTIONS) * ST_KILOBYTE; if (value < 1 || value > st_buffer_size) { printk(KERN_WARNING "st%d: Write threshold %d too small or too large.\n", dev, value); return (-EIO); } STp->write_threshold = value; printk(KERN_INFO "st%d: Write threshold set to %d bytes.\n", dev, value); } else if (code == MT_ST_DEF_BLKSIZE) { value = (options & ~MT_ST_OPTIONS); if (value == ~MT_ST_OPTIONS) { STm->default_blksize = (-1); printk(KERN_INFO "st%d: Default block size disabled.\n", dev); } else { STm->default_blksize = value; printk(KERN_INFO "st%d: Default block size set to %d bytes.\n", dev, STm->default_blksize); } } else if (code == MT_ST_TIMEOUTS) { value = (options & ~MT_ST_OPTIONS); if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; printk(KERN_INFO "st%d: Long timeout set to %d seconds.\n", dev, (value & ~MT_ST_SET_LONG_TIMEOUT)); } else { STp->timeout = value * HZ; printk(KERN_INFO "st%d: Normal timeout set to %d seconds.\n", dev, value); } } else if (code == MT_ST_DEF_OPTIONS) { code = (options & ~MT_ST_CLEAR_DEFAULT); value = (options & MT_ST_CLEAR_DEFAULT); if (code == MT_ST_DEF_DENSITY) { if (value == MT_ST_CLEAR_DEFAULT) { STm->default_density = (-1); printk(KERN_INFO "st%d: Density default disabled.\n", dev); } else { STm->default_density = value & 0xff; printk(KERN_INFO "st%d: Density default set to %x\n", dev, STm->default_density); } } else if (code == MT_ST_DEF_DRVBUFFER) { if (value == MT_ST_CLEAR_DEFAULT) { STp->default_drvbuffer = 0xff; printk(KERN_INFO "st%d: Drive buffer default disabled.\n", dev); } else { STp->default_drvbuffer = value & 7; printk(KERN_INFO "st%d: Drive buffer default set to %x\n", dev, STp->default_drvbuffer); } } else if (code == MT_ST_DEF_COMPRESSION) { if (value == MT_ST_CLEAR_DEFAULT) { STm->default_compression = ST_DONT_TOUCH; printk(KERN_INFO "st%d: Compression default disabled.\n", dev); } else { STm->default_compression = (value & 1 ? ST_YES : ST_NO); printk(KERN_INFO "st%d: Compression default set to %x\n", dev, (value & 1)); } } } else return (-EIO); return 0; } #define COMPRESSION_PAGE 0x0f #define COMPRESSION_PAGE_LENGTH 16 #define MODE_HEADER_LENGTH 4 #define DCE_MASK 0x80 #define DCC_MASK 0x40 #define RED_MASK 0x60 /* Control the compression with mode page 15. Algorithm not changed if zero. */ static int st_compression(Scsi_Tape * STp, int state) { int dev; unsigned char cmd[10]; Scsi_Cmnd * SCpnt = NULL; if (STp->ready != ST_READY) return (-EIO); /* Read the current page contents */ memset(cmd, 0, 10); cmd[0] = MODE_SENSE; cmd[1] = 8; cmd[2] = COMPRESSION_PAGE; cmd[4] = COMPRESSION_PAGE_LENGTH + MODE_HEADER_LENGTH; SCpnt = st_do_scsi(SCpnt, STp, cmd, cmd[4], STp->timeout, 0, TRUE); if (SCpnt == NULL) return (-EBUSY); dev = TAPE_NR(SCpnt->request.rq_dev); if ((STp->buffer)->last_result_fatal != 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression mode page not supported.\n", dev); #endif scsi_release_command(SCpnt); SCpnt = NULL; return (-EIO); } #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression state is %d.\n", dev, ((STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] & DCE_MASK ? 1 : 0)); #endif /* Check if compression can be changed */ if (((STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] & DCC_MASK) == 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression not supported.\n", dev); #endif scsi_release_command(SCpnt); SCpnt = NULL; return (-EIO); } /* Do the change */ if (state) (STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] |= DCE_MASK; else (STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] &= ~DCE_MASK; memset(cmd, 0, 10); cmd[0] = MODE_SELECT; cmd[1] = 0x10; cmd[4] = COMPRESSION_PAGE_LENGTH + MODE_HEADER_LENGTH; (STp->buffer)->b_data[0] = 0; /* Reserved data length */ (STp->buffer)->b_data[1] = 0; /* Reserved media type byte */ (STp->buffer)->b_data[MODE_HEADER_LENGTH] &= 0x3f; SCpnt = st_do_scsi(SCpnt, STp, cmd, cmd[4], STp->timeout, 0, TRUE); if ((STp->buffer)->last_result_fatal != 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression change failed.\n", dev); #endif scsi_release_command(SCpnt); SCpnt = NULL; return (-EIO); } #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression state changed to %d.\n", dev, state); #endif scsi_release_command(SCpnt); SCpnt = NULL; STp->compression_changed = TRUE; return 0; } /* Internal ioctl function */ static int st_int_ioctl(struct inode * inode, unsigned int cmd_in, unsigned long arg) { int timeout; long ltmp; int i, ioctl_result; int chg_eof = TRUE; unsigned char cmd[10]; Scsi_Cmnd * SCpnt; Scsi_Tape * STp; ST_partstat * STps; int fileno, blkno, at_sm, undone, datalen; int dev = TAPE_NR(inode->i_rdev); STp = &(scsi_tapes[dev]); if (STp->ready != ST_READY && cmd_in != MTLOAD) { if (STp->ready == ST_NO_TAPE) return (-ENOMEDIUM); else return (-EIO); } timeout = STp->long_timeout; STps = &(STp->ps[STp->partition]); fileno = STps->drv_file; blkno = STps->drv_block; at_sm = STps->at_sm; memset(cmd, 0, 10); datalen = 0; switch (cmd_in) { case MTFSFM: chg_eof = FALSE; /* Changed from the FSF after this */ case MTFSF: cmd[0] = SPACE; cmd[1] = 0x01; /* Space FileMarks */ cmd[2] = (arg >> 16); cmd[3] = (arg >> 8); cmd[4] = arg; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Spacing tape forward over %d filemarks.\n", dev, cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); #endif if (fileno >= 0) fileno += arg; blkno = 0; at_sm &= (arg == 0); break; case MTBSFM: chg_eof = FALSE; /* Changed from the FSF after this */ case MTBSF: cmd[0] = SPACE; cmd[1] = 0x01; /* Space FileMarks */ ltmp = (-arg); cmd[2] = (ltmp >> 16); cmd[3] = (ltmp >> 8); cmd[4] = ltmp; #if DEBUG if (debugging) { if (cmd[2] & 0x80) ltmp = 0xff000000; ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; printk(ST_DEB_MSG "st%d: Spacing tape backward over %ld filemarks.\n", dev, (-ltmp)); } #endif if (fileno >= 0) fileno -= arg; blkno = (-1); /* We can't know the block number */ at_sm &= (arg == 0); break; case MTFSR: cmd[0] = SPACE; cmd[1] = 0x00; /* Space Blocks */ cmd[2] = (arg >> 16); cmd[3] = (arg >> 8); cmd[4] = arg; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Spacing tape forward %d blocks.\n", dev, cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); #endif if (blkno >= 0) blkno += arg; at_sm &= (arg == 0); break; case MTBSR: cmd[0] = SPACE; cmd[1] = 0x00; /* Space Blocks */ ltmp = (-arg); cmd[2] = (ltmp >> 16); cmd[3] = (ltmp >> 8); cmd[4] = ltmp; #if DEBUG if (debugging) { if (cmd[2] & 0x80) ltmp = 0xff000000; ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; printk(ST_DEB_MSG "st%d: Spacing tape backward %ld blocks.\n", dev, (-ltmp)); } #endif if (blkno >= 0) blkno -= arg; at_sm &= (arg == 0); break; case MTFSS: cmd[0] = SPACE; cmd[1] = 0x04; /* Space Setmarks */ cmd[2] = (arg >> 16); cmd[3] = (arg >> 8); cmd[4] = arg; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Spacing tape forward %d setmarks.\n", dev, cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); #endif if (arg != 0) { blkno = fileno = (-1); at_sm = 1; } break; case MTBSS: cmd[0] = SPACE; cmd[1] = 0x04; /* Space Setmarks */ ltmp = (-arg); cmd[2] = (ltmp >> 16); cmd[3] = (ltmp >> 8); cmd[4] = ltmp; #if DEBUG if (debugging) { if (cmd[2] & 0x80) ltmp = 0xff000000; ltmp = ltmp | (cmd[2] << 16) | (cmd[3] << 8) | cmd[4]; printk(ST_DEB_MSG "st%d: Spacing tape backward %ld setmarks.\n", dev, (-ltmp)); } #endif if (arg != 0) { blkno = fileno = (-1); at_sm = 1; } break; case MTWEOF: case MTWSM: if (STp->write_prot) return (-EACCES); cmd[0] = WRITE_FILEMARKS; if (cmd_in == MTWSM) cmd[1] = 2; cmd[2] = (arg >> 16); cmd[3] = (arg >> 8); cmd[4] = arg; timeout = STp->timeout; #if DEBUG if (debugging) { if (cmd_in == MTWEOF) printk(ST_DEB_MSG "st%d: Writing %d filemarks.\n", dev, cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); else printk(ST_DEB_MSG "st%d: Writing %d setmarks.\n", dev, cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); } #endif if (fileno >= 0) fileno += arg; blkno = 0; at_sm = (cmd_in == MTWSM); break; case MTREW: cmd[0] = REZERO_UNIT; #if ST_NOWAIT cmd[1] = 1; /* Don't wait for completion */ timeout = STp->timeout; #endif #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Rewinding tape.\n", dev); #endif fileno = blkno = at_sm = 0 ; break; case MTOFFL: case MTLOAD: case MTUNLOAD: cmd[0] = START_STOP; if (cmd_in == MTLOAD) cmd[4] |= 1; /* * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A */ if (cmd_in != MTOFFL && arg >= 1 + MT_ST_HPLOADER_OFFSET && arg <= 6 + MT_ST_HPLOADER_OFFSET) { #if DEBUG if (debugging) { printk(ST_DEB_MSG "st%d: Enhanced %sload slot %2ld.\n", dev, (cmd[4]) ? "" : "un", arg - MT_ST_HPLOADER_OFFSET); } #endif cmd[3] = arg - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ } #if ST_NOWAIT cmd[1] = 1; /* Don't wait for completion */ timeout = STp->timeout; #else timeout = STp->long_timeout; #endif #if DEBUG if (debugging) { if (cmd_in != MTLOAD) printk(ST_DEB_MSG "st%d: Unloading tape.\n", dev); else printk(ST_DEB_MSG "st%d: Loading tape.\n", dev); } #endif fileno = blkno = at_sm = 0 ; break; case MTNOP: #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: No op on tape.\n", dev); #endif return 0; /* Should do something ? */ break; case MTRETEN: cmd[0] = START_STOP; #if ST_NOWAIT cmd[1] = 1; /* Don't wait for completion */ timeout = STp->timeout; #endif cmd[4] = 3; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Retensioning tape.\n", dev); #endif fileno = blkno = at_sm = 0; break; case MTEOM: if (!STp->fast_mteom) { /* space to the end of tape */ ioctl_result = st_int_ioctl(inode, MTFSF, 0x3fff); fileno = STps->drv_file; if (STps->eof >= ST_EOD_1) return 0; /* The next lines would hide the number of spaced FileMarks That's why I inserted the previous lines. I had no luck with detecting EOM with FSF, so we go now to EOM. Joerg Weule */ } else fileno = (-1); cmd[0] = SPACE; cmd[1] = 3; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Spacing to end of recorded medium.\n", dev); #endif blkno = 0; at_sm = 0; break; case MTERASE: if (STp->write_prot) return (-EACCES); cmd[0] = ERASE; cmd[1] = 1; /* To the end of tape */ #if ST_NOWAIT cmd[1] |= 2; /* Don't wait for completion */ timeout = STp->timeout; #else timeout = STp->long_timeout * 8; #endif #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Erasing tape.\n", dev); #endif fileno = blkno = at_sm = 0 ; break; case MTLOCK: chg_eof = FALSE; cmd[0] = ALLOW_MEDIUM_REMOVAL; cmd[4] = SCSI_REMOVAL_PREVENT; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Locking drive door.\n", dev); #endif; break; case MTUNLOCK: chg_eof = FALSE; cmd[0] = ALLOW_MEDIUM_REMOVAL; cmd[4] = SCSI_REMOVAL_ALLOW; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Unlocking drive door.\n", dev); #endif; break; case MTSETBLK: /* Set block length */ case MTSETDENSITY: /* Set tape density */ case MTSETDRVBUFFER: /* Set drive buffering */ case SET_DENS_AND_BLK: /* Set density and block size */ chg_eof = FALSE; if (STp->dirty || (STp->buffer)->buffer_bytes != 0) return (-EIO); /* Not allowed if data in buffer */ if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && (arg & MT_ST_BLKSIZE_MASK) != 0 && ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || (arg & MT_ST_BLKSIZE_MASK) > STp->max_block || (arg & MT_ST_BLKSIZE_MASK) > st_buffer_size)) { printk(KERN_WARNING "st%d: Illegal block size.\n", dev); return (-EINVAL); } cmd[0] = MODE_SELECT; cmd[4] = datalen = 12; memset((STp->buffer)->b_data, 0, 12); if (cmd_in == MTSETDRVBUFFER) (STp->buffer)->b_data[2] = (arg & 7) << 4; else (STp->buffer)->b_data[2] = STp->drv_buffer << 4; (STp->buffer)->b_data[3] = 8; /* block descriptor length */ if (cmd_in == MTSETDENSITY) { (STp->buffer)->b_data[4] = arg; STp->density_changed = TRUE; /* At least we tried ;-) */ } else if (cmd_in == SET_DENS_AND_BLK) (STp->buffer)->b_data[4] = arg >> 24; else (STp->buffer)->b_data[4] = STp->density; if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { ltmp = arg & MT_ST_BLKSIZE_MASK; if (cmd_in == MTSETBLK) STp->blksize_changed = TRUE; /* At least we tried ;-) */ } else ltmp = STp->block_size; (STp->buffer)->b_data[9] = (ltmp >> 16); (STp->buffer)->b_data[10] = (ltmp >> 8); (STp->buffer)->b_data[11] = ltmp; timeout = STp->timeout; #if DEBUG if (debugging) { if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) printk(ST_DEB_MSG "st%d: Setting block size to %d bytes.\n", dev, (STp->buffer)->b_data[9] * 65536 + (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]); if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) printk(ST_DEB_MSG "st%d: Setting density code to %x.\n", dev, (STp->buffer)->b_data[4]); if (cmd_in == MTSETDRVBUFFER) printk(ST_DEB_MSG "st%d: Setting drive buffer code to %d.\n", dev, ((STp->buffer)->b_data[2] >> 4) & 7); } #endif break; default: return (-ENOSYS); } SCpnt = st_do_scsi(NULL, STp, cmd, datalen, timeout, MAX_RETRIES, TRUE); if (!SCpnt) return (-EBUSY); ioctl_result = (STp->buffer)->last_result_fatal; if (!ioctl_result) { /* SCSI command successful */ scsi_release_command(SCpnt); SCpnt = NULL; STps->drv_block = blkno; STps->drv_file = fileno; STps->at_sm = at_sm; if (cmd_in == MTLOCK) STp->door_locked = ST_LOCKED_EXPLICIT; else if (cmd_in == MTUNLOCK) STp->door_locked = ST_UNLOCKED; if (cmd_in == MTBSFM) ioctl_result = st_int_ioctl(inode, MTFSF, 1); else if (cmd_in == MTFSFM) ioctl_result = st_int_ioctl(inode, MTBSF, 1); if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { STp->block_size = arg & MT_ST_BLKSIZE_MASK; if (STp->block_size != 0) (STp->buffer)->buffer_blocks = (STp->buffer)->buffer_size / STp->block_size; (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; if (cmd_in == SET_DENS_AND_BLK) STp->density = arg >> MT_ST_DENSITY_SHIFT; } else if (cmd_in == MTSETDRVBUFFER) STp->drv_buffer = (arg & 7); else if (cmd_in == MTSETDENSITY) STp->density = arg; if (cmd_in == MTEOM) STps->eof = ST_EOD; else if (cmd_in == MTFSF) STps->eof = ST_FM; else if (chg_eof) STps->eof = ST_NOEOF; if (cmd_in == MTOFFL || cmd_in == MTUNLOAD) STp->rew_at_close = 0; else if (cmd_in == MTLOAD) { STp->rew_at_close = (MINOR(inode->i_rdev) & 0x80) == 0; for (i=0; i < ST_NBR_PARTITIONS; i++) { STp->ps[i].rw = ST_IDLE; STp->ps[i].last_block_valid = FALSE; } STp->partition = 0; } } else { /* SCSI command was not completely successful. Don't return from this block without releasing the SCSI command block! */ if (SCpnt->sense_buffer[2] & 0x40) { if (cmd_in != MTBSF && cmd_in != MTBSFM && cmd_in != MTBSR && cmd_in != MTBSS) STps->eof = ST_EOM_OK; STps->drv_block = 0; } undone = ( (SCpnt->sense_buffer[3] << 24) + (SCpnt->sense_buffer[4] << 16) + (SCpnt->sense_buffer[5] << 8) + SCpnt->sense_buffer[6] ); if (cmd_in == MTWEOF && (SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x4f) == 0x40 && ((SCpnt->sense_buffer[0] & 0x80) == 0 || undone == 0)) { ioctl_result = 0; /* EOF written succesfully at EOM */ if (fileno >= 0) fileno++; STps->drv_file = fileno; STps->eof = ST_NOEOF; } else if ( (cmd_in == MTFSF) || (cmd_in == MTFSFM) ) { if (fileno >= 0) STps->drv_file = fileno - undone ; else STps->drv_file = fileno; STps->drv_block = 0; STps->eof = ST_NOEOF; } else if ( (cmd_in == MTBSF) || (cmd_in == MTBSFM) ) { if (fileno >= 0) STps->drv_file = fileno + undone ; else STps->drv_file = fileno; STps->drv_block = 0; STps->eof = ST_NOEOF; } else if (cmd_in == MTFSR) { if (SCpnt->sense_buffer[2] & 0x80) { /* Hit filemark */ if (STps->drv_file >= 0) STps->drv_file++; STps->drv_block = 0; STps->eof = ST_FM; } else { if (blkno >= undone) STps->drv_block = blkno - undone; else STps->drv_block = (-1); STps->eof = ST_NOEOF; } } else if (cmd_in == MTBSR) { if (SCpnt->sense_buffer[2] & 0x80) { /* Hit filemark */ STps->drv_file--; STps->drv_block = (-1); } else { if (blkno >= 0) STps->drv_block = blkno + undone; else STps->drv_block = (-1); } STps->eof = ST_NOEOF; } else if (cmd_in == MTEOM) { STps->drv_file = (-1); STps->drv_block = (-1); STps->eof = ST_EOD; } else if (chg_eof) STps->eof = ST_NOEOF; if ((SCpnt->sense_buffer[2] & 0x0f) == BLANK_CHECK) STps->eof = ST_EOD; if (cmd_in == MTLOCK) STp->door_locked = ST_LOCK_FAILS; scsi_release_command(SCpnt); SCpnt = NULL; } return ioctl_result; } /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc structure. */ static int get_location(struct inode * inode, unsigned int *block, int *partition, int logical) { Scsi_Tape *STp; int dev = TAPE_NR(inode->i_rdev); int result; unsigned char scmd[10]; Scsi_Cmnd *SCpnt; STp = &(scsi_tapes[dev]); if (STp->ready != ST_READY) return (-EIO); memset (scmd, 0, 10); if ((STp->device)->scsi_level < SCSI_2) { scmd[0] = QFA_REQUEST_BLOCK; scmd[4] = 3; } else { scmd[0] = READ_POSITION; if (!logical && !STp->scsi2_logical) scmd[1] = 1; } SCpnt = st_do_scsi(NULL, STp, scmd, 20, STp->timeout, MAX_READY_RETRIES, TRUE); if (!SCpnt) return (-EBUSY); if ((STp->buffer)->last_result_fatal != 0 || (STp->device->scsi_level >= SCSI_2 && ((STp->buffer)->b_data[0] & 4) != 0)) { *block = *partition = 0; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Can't read tape position.\n", dev); #endif result = (-EIO); } else { result = 0; if ((STp->device)->scsi_level < SCSI_2) { *block = ((STp->buffer)->b_data[0] << 16) + ((STp->buffer)->b_data[1] << 8) + (STp->buffer)->b_data[2]; *partition = 0; } else { *block = ((STp->buffer)->b_data[4] << 24) + ((STp->buffer)->b_data[5] << 16) + ((STp->buffer)->b_data[6] << 8) + (STp->buffer)->b_data[7]; *partition = (STp->buffer)->b_data[1]; if (((STp->buffer)->b_data[0] & 0x80) && (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ STp->ps[0].drv_block = STp->ps[0].drv_file = 0; } #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Got tape pos. blk %d part %d.\n", dev, *block, *partition); #endif } scsi_release_command(SCpnt); SCpnt = NULL; return result; } /* Set the tape block and partition. Negative partition means that only the block should be set in vendor specific way. */ static int set_location(struct inode * inode, unsigned int block, int partition, int logical) { Scsi_Tape *STp; ST_partstat *STps; int dev = TAPE_NR(inode->i_rdev); int result, p; unsigned int blk; int timeout; unsigned char scmd[10]; Scsi_Cmnd *SCpnt; STp = &(scsi_tapes[dev]); if (STp->ready != ST_READY) return (-EIO); timeout = STp->long_timeout; STps = &(STp->ps[STp->partition]); #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Setting block to %d and partition to %d.\n", dev, block, partition); if (partition < 0) return (-EIO); #endif /* Update the location at the partition we are leaving */ if ((!STp->can_partitions && partition != 0) || partition >= ST_NBR_PARTITIONS) return (-EINVAL); if (partition != STp->partition) { if (get_location(inode, &blk, &p, 1)) STps->last_block_valid = FALSE; else { STps->last_block_valid = TRUE; STps->last_block_visited = blk; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Visited block %d for partition %d saved.\n", dev, blk, STp->partition); #endif } } memset (scmd, 0, 10); if ((STp->device)->scsi_level < SCSI_2) { scmd[0] = QFA_SEEK_BLOCK; scmd[2] = (block >> 16); scmd[3] = (block >> 8); scmd[4] = block; scmd[5] = 0; } else { scmd[0] = SEEK_10; scmd[3] = (block >> 24); scmd[4] = (block >> 16); scmd[5] = (block >> 8); scmd[6] = block; if (!logical && !STp->scsi2_logical) scmd[1] = 4; if (STp->partition != partition) { scmd[1] |= 2; scmd[8] = partition; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Trying to change partition from %d to %d\n", dev, STp->partition, partition); #endif } } #if ST_NOWAIT scmd[1] |= 1; /* Don't wait for completion */ timeout = STp->timeout; #endif SCpnt = st_do_scsi(NULL, STp, scmd, 20, timeout, MAX_READY_RETRIES, TRUE); if (!SCpnt) return (-EBUSY); STps->drv_block = STps->drv_file = (-1); STps->eof = ST_NOEOF; if ((STp->buffer)->last_result_fatal != 0) { result = (-EIO); if (STp->can_partitions && (STp->device)->scsi_level >= SCSI_2 && (p = find_partition(inode)) >= 0) STp->partition = p; } else { if (STp->can_partitions) { STp->partition = partition; STps = &(STp->ps[partition]); if (!STps->last_block_valid || STps->last_block_visited != block) { STps->at_sm = 0; STps->rw = ST_IDLE; } } else STps->at_sm = 0; if (block == 0) STps->drv_block = STps->drv_file = 0; result = 0; } scsi_release_command(SCpnt); SCpnt = NULL; return result; } /* Find the current partition number for the drive status. Called from open and returns either partition number of negative error code. */ static int find_partition(struct inode *inode) { int i, partition; unsigned int block; if ((i = get_location(inode, &block, &partition, 1)) < 0) return i; if (partition >= ST_NBR_PARTITIONS) return (-EIO); return partition; } /* Change the partition if necessary */ static int update_partition(struct inode * inode) { int dev = TAPE_NR(inode->i_rdev); Scsi_Tape *STp; ST_partstat *STps; STp = &(scsi_tapes[dev]); if (STp->partition == STp->new_partition) return 0; STps = &(STp->ps[STp->new_partition]); if (!STps->last_block_valid) STps->last_block_visited = 0; return set_location(inode, STps->last_block_visited, STp->new_partition, 1); } /* Functions for reading and writing the medium partition mode page. These seem to work with Wangtek 6200HS and HP C1533A. */ #define PART_PAGE 0x11 #define PART_PAGE_LENGTH 10 /* Get the number of partitions on the tape. As a side effect reads the mode page into the tape buffer. */ static int nbr_partitions(struct inode * inode) { int dev = TAPE_NR(inode->i_rdev), result; Scsi_Tape *STp; Scsi_Cmnd * SCpnt = NULL; unsigned char cmd[10]; STp = &(scsi_tapes[dev]); if (STp->ready != ST_READY) return (-EIO); memset ((void *) &cmd[0], 0, 10); cmd[0] = MODE_SENSE; cmd[1] = 8; /* Page format */ cmd[2] = PART_PAGE; cmd[4] = 200; SCpnt = st_do_scsi(SCpnt, STp, cmd, 200, STp->timeout, MAX_READY_RETRIES, TRUE); if (SCpnt == NULL) return (-EBUSY); scsi_release_command(SCpnt); SCpnt = NULL; if ((STp->buffer)->last_result_fatal != 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Can't read medium partition page.\n", dev); #endif result = (-EIO); } else { result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] + 1; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Number of partitions %d.\n", dev, result); #endif } return result; } /* Partition the tape into two partitions if size > 0 or one partition if size == 0 */ static int partition_tape(struct inode * inode, int size) { int dev = TAPE_NR(inode->i_rdev), result; int length; Scsi_Tape *STp; Scsi_Cmnd * SCpnt = NULL; unsigned char cmd[10], *bp; if ((result = nbr_partitions(inode)) < 0) return result; STp = &(scsi_tapes[dev]); /* The mode page is in the buffer. Let's modify it and write it. */ bp = &((STp->buffer)->b_data[0]); if (size <= 0) { length = 8; bp[MODE_HEADER_LENGTH + 3] = 0; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Formatting tape with one partition.\n", dev); #endif } else { length = 10; bp[MODE_HEADER_LENGTH + 3] = 1; bp[MODE_HEADER_LENGTH + 8] = (size >> 8) & 0xff; bp[MODE_HEADER_LENGTH + 9] = size & 0xff; #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Formatting tape with two partition (1 = %d MB).\n", dev, size); #endif } bp[MODE_HEADER_LENGTH + 6] = 0; bp[MODE_HEADER_LENGTH + 7] = 0; bp[MODE_HEADER_LENGTH + 4] = 0x30; /* IDP | PSUM = MB */ bp[0] = 0; bp[1] = 0; bp[MODE_HEADER_LENGTH] &= 0x3f; bp[MODE_HEADER_LENGTH + 1] = length - 2; memset(cmd, 0, 10); cmd[0] = MODE_SELECT; cmd[1] = 0x10; cmd[4] = length + MODE_HEADER_LENGTH; SCpnt = st_do_scsi(SCpnt, STp, cmd, cmd[4], STp->long_timeout, MAX_READY_RETRIES, TRUE); if (SCpnt == NULL) return (-EBUSY); scsi_release_command(SCpnt); SCpnt = NULL; if ((STp->buffer)->last_result_fatal != 0) { printk(KERN_INFO "st%d: Partitioning of tape failed.\n", dev); result = (-EIO); } else result = 0; return result; } /* The ioctl command */ static int st_ioctl(struct inode * inode,struct file * file, unsigned int cmd_in, unsigned long arg) { int i, cmd_nr, cmd_type, bt; unsigned int blk; struct mtop mtc; struct mtpos mt_pos; Scsi_Tape *STp; ST_mode *STm; ST_partstat *STps; int dev = TAPE_NR(inode->i_rdev); STp = &(scsi_tapes[dev]); #if DEBUG if (debugging && !STp->in_use) { printk(ST_DEB_MSG "st%d: Incorrect device.\n", dev); return (-EIO); } #endif STm = &(STp->modes[STp->current_mode]); STps = &(STp->ps[STp->partition]); /* * 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(STp->device) ) { return -ENXIO; } cmd_type = _IOC_TYPE(cmd_in); cmd_nr = _IOC_NR(cmd_in); if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { if (_IOC_SIZE(cmd_in) != sizeof(mtc)) return (-EINVAL); i = copy_from_user((char *) &mtc, (char *)arg, sizeof(struct mtop)); if (i) return (-EFAULT); if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { printk(KERN_WARNING "st%d: MTSETDRVBUFFER only allowed for root.\n", dev); return (-EPERM); } if (!STm->defined && (mtc.mt_op != MTSETDRVBUFFER && (mtc.mt_count & MT_ST_OPTIONS) == 0)) return (-ENXIO); if (!(STp->device)->was_reset) { if (STps->eof == ST_FM_HIT) { if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM|| mtc.mt_op == MTEOM) { mtc.mt_count -= 1; if (STps->drv_file >= 0) STps->drv_file += 1; } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { mtc.mt_count += 1; if (STps->drv_file >= 0) STps->drv_file += 1; } } if (mtc.mt_op == MTSEEK) { /* Old position must be restored if partition will be changed */ i = !STp->can_partitions || (STp->new_partition != STp->partition); } else { i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || mtc.mt_op == MTCOMPRESSION; } i = flush_buffer(inode, file, i); if (i < 0) return i; } else { /* * If there was a bus reset, block further access * to this device. If the user wants to rewind the tape, * then reset the flag and allow access again. */ if(mtc.mt_op != MTREW && mtc.mt_op != MTOFFL && mtc.mt_op != MTRETEN && mtc.mt_op != MTERASE && mtc.mt_op != MTSEEK && mtc.mt_op != MTEOM) return (-EIO); STp->device->was_reset = 0; if (STp->door_locked != ST_UNLOCKED && STp->door_locked != ST_LOCK_FAILS) { if (st_int_ioctl(inode, MTLOCK, 0)) { printk(KERN_NOTICE "st%d: Could not relock door after bus reset.\n", dev); STp->door_locked = ST_UNLOCKED; } } } if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) st_int_ioctl(inode, MTUNLOCK, 0); /* Ignore result! */ if (mtc.mt_op == MTSETDRVBUFFER && (mtc.mt_count & MT_ST_OPTIONS) != 0) return st_set_options(inode, mtc.mt_count); if (mtc.mt_op == MTSETPART) { if (!STp->can_partitions || mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) return (-EINVAL); if (mtc.mt_count >= STp->nbr_partitions && (STp->nbr_partitions = nbr_partitions(inode)) < 0) return (-EIO); if (mtc.mt_count >= STp->nbr_partitions) return (-EINVAL); STp->new_partition = mtc.mt_count; return 0; } if (mtc.mt_op == MTMKPART) { if (!STp->can_partitions) return (-EINVAL); if ((i = st_int_ioctl(inode, MTREW, 0)) < 0 || (i = partition_tape(inode, mtc.mt_count)) < 0) return i; for (i=0; i < ST_NBR_PARTITIONS; i++) { STp->ps[i].rw = ST_IDLE; STp->ps[i].at_sm = 0; STp->ps[i].last_block_valid = FALSE; } STp->partition = STp->new_partition = 0; STp->nbr_partitions = 1; /* Bad guess ?-) */ STps->drv_block = STps->drv_file = 0; return 0; } if (mtc.mt_op == MTSEEK) { i = set_location(inode, mtc.mt_count, STp->new_partition, 0); if (!STp->can_partitions) STp->ps[0].rw = ST_IDLE; return i; } if (STp->can_partitions && STp->ready == ST_READY && (i = update_partition(inode)) < 0) return i; if (mtc.mt_op == MTCOMPRESSION) return st_compression(STp, (mtc.mt_count & 1)); else return st_int_ioctl(inode, mtc.mt_op, mtc.mt_count); } if (!STm->defined) return (-ENXIO); if ((i = flush_buffer(inode, file, FALSE)) < 0) return i; if (STp->can_partitions && (i = update_partition(inode)) < 0) return i; if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) return (-EINVAL); (STp->mt_status)->mt_dsreg = ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); (STp->mt_status)->mt_blkno = STps->drv_block; (STp->mt_status)->mt_fileno = STps->drv_file; if (STp->block_size != 0) { if (STps->rw == ST_WRITING) (STp->mt_status)->mt_blkno += (STp->buffer)->buffer_bytes / STp->block_size; else if (STps->rw == ST_READING) (STp->mt_status)->mt_blkno -= ((STp->buffer)->buffer_bytes + STp->block_size - 1) / STp->block_size; } (STp->mt_status)->mt_gstat = 0; if (STp->drv_write_prot) (STp->mt_status)->mt_gstat |= GMT_WR_PROT(0xffffffff); if ((STp->mt_status)->mt_blkno == 0) { if ((STp->mt_status)->mt_fileno == 0) (STp->mt_status)->mt_gstat |= GMT_BOT(0xffffffff); else (STp->mt_status)->mt_gstat |= GMT_EOF(0xffffffff); } (STp->mt_status)->mt_resid = STp->partition; if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) (STp->mt_status)->mt_gstat |= GMT_EOT(0xffffffff); else if (STps->eof >= ST_EOM_OK) (STp->mt_status)->mt_gstat |= GMT_EOD(0xffffffff); if (STp->density == 1) (STp->mt_status)->mt_gstat |= GMT_D_800(0xffffffff); else if (STp->density == 2) (STp->mt_status)->mt_gstat |= GMT_D_1600(0xffffffff); else if (STp->density == 3) (STp->mt_status)->mt_gstat |= GMT_D_6250(0xffffffff); if (STp->ready == ST_READY) (STp->mt_status)->mt_gstat |= GMT_ONLINE(0xffffffff); if (STp->ready == ST_NO_TAPE) (STp->mt_status)->mt_gstat |= GMT_DR_OPEN(0xffffffff); if (STps->at_sm) (STp->mt_status)->mt_gstat |= GMT_SM(0xffffffff); if (STm->do_async_writes || (STm->do_buffer_writes && STp->block_size != 0) || STp->drv_buffer != 0) (STp->mt_status)->mt_gstat |= GMT_IM_REP_EN(0xffffffff); i = copy_to_user((char *)arg, (char *)(STp->mt_status), sizeof(struct mtget)); if (i) return (-EFAULT); (STp->mt_status)->mt_erreg = 0; /* Clear after read */ return 0; } /* End of MTIOCGET */ if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) return (-EINVAL); if ((i = get_location(inode, &blk, &bt, 0)) < 0) return i; mt_pos.mt_blkno = blk; i = copy_to_user((char *)arg, (char *) (&mt_pos), sizeof(struct mtpos)); if (i) return (-EFAULT); return 0; } return scsi_ioctl(STp->device, cmd_in, (void *) arg); } /* Try to allocate a new tape buffer */ static ST_buffer * new_tape_buffer( int from_initialization, int need_dma ) { int i, priority, b_size, got = 0, segs = 0; ST_buffer *tb; if (st_nbr_buffers >= st_template.dev_max) return NULL; /* Should never happen */ if (from_initialization) priority = GFP_ATOMIC; else priority = GFP_KERNEL; i = sizeof(ST_buffer) + (st_max_sg_segs - 1) * sizeof(struct scatterlist); tb = (ST_buffer *)scsi_init_malloc(i, priority); if (tb) { tb->this_size = i; if (need_dma) priority |= GFP_DMA; /* Try to allocate the first segment up to ST_FIRST_ORDER and the others big enough to reach the goal */ for (b_size = PAGE_SIZE << ST_FIRST_ORDER; b_size / 2 >= st_buffer_size && b_size > PAGE_SIZE; ) b_size /= 2; for ( ; b_size >= PAGE_SIZE; b_size /= 2) { tb->sg[0].address = (unsigned char *)scsi_init_malloc(b_size, priority); if (tb->sg[0].address != NULL) { tb->sg[0].alt_address = NULL; tb->sg[0].length = b_size; break; } } if (tb->sg[segs].address == NULL) { scsi_init_free((char *)tb, tb->this_size); tb = NULL; } else { /* Got something, continue */ for (b_size = PAGE_SIZE; st_buffer_size > tb->sg[0].length + (ST_FIRST_SG - 1) * b_size; ) b_size *= 2; for (segs=1, got=tb->sg[0].length; got < st_buffer_size && segs < ST_FIRST_SG; ) { tb->sg[segs].address = (unsigned char *)scsi_init_malloc(b_size, priority); if (tb->sg[segs].address == NULL) { if (st_buffer_size - got <= (ST_FIRST_SG - segs) * b_size / 2) { b_size /= 2; /* Large enough for the rest of the buffers */ continue; } for (i=0; i < segs - 1; i++) scsi_init_free(tb->sg[i].address, tb->sg[i].length); scsi_init_free((char *)tb, tb->this_size); tb = NULL; break; } tb->sg[segs].alt_address = NULL; tb->sg[segs].length = b_size; got += b_size; segs++; } } } if (!tb) { printk(KERN_NOTICE "st: Can't allocate new tape buffer (nbr %d).\n", st_nbr_buffers); return NULL; } tb->sg_segs = tb->orig_sg_segs = segs; tb->b_data = tb->sg[0].address; #if DEBUG if (debugging) { printk(ST_DEB_MSG "st: Allocated tape buffer %d (%d bytes, %d segments, dma: %d, a: %p).\n", st_nbr_buffers, got, tb->sg_segs, need_dma, tb->b_data); printk(ST_DEB_MSG "st: segment sizes: first %d, last %d bytes.\n", tb->sg[0].length, tb->sg[segs-1].length); } #endif tb->in_use = 0; tb->dma = need_dma; tb->buffer_size = got; tb->writing = 0; st_buffers[st_nbr_buffers++] = tb; return tb; } /* Try to allocate a temporary enlarged tape buffer */ static int enlarge_buffer(ST_buffer *STbuffer, int new_size, int need_dma) { int segs, nbr, max_segs, b_size, priority, got; normalize_buffer(STbuffer); max_segs = STbuffer->use_sg; if (max_segs > st_max_sg_segs) max_segs = st_max_sg_segs; nbr = max_segs - STbuffer->sg_segs; if (nbr <= 0) return FALSE; priority = GFP_KERNEL; if (need_dma) priority |= GFP_DMA; for (b_size = PAGE_SIZE; b_size * nbr < new_size - STbuffer->buffer_size; ) b_size *= 2; for (segs=STbuffer->sg_segs, got=STbuffer->buffer_size; segs < max_segs && got < new_size; ) { STbuffer->sg[segs].address = (unsigned char *)scsi_init_malloc(b_size, priority); if (STbuffer->sg[segs].address == NULL) { if (new_size - got <= (max_segs - segs) * b_size / 2) { b_size /= 2; /* Large enough for the rest of the buffers */ continue; } printk(KERN_NOTICE "st: failed to enlarge buffer to %d bytes.\n", new_size); normalize_buffer(STbuffer); return FALSE; } STbuffer->sg[segs].alt_address = NULL; STbuffer->sg[segs].length = b_size; STbuffer->sg_segs += 1; got += b_size; STbuffer->buffer_size = got; segs++; } #if DEBUG if (debugging) printk(ST_DEB_MSG "st: Succeeded to enlarge buffer to %d bytes (segs %d->%d, %d).\n", got, STbuffer->orig_sg_segs, STbuffer->sg_segs, b_size); #endif return TRUE; } /* Release the extra buffer */ static void normalize_buffer(ST_buffer *STbuffer) { int i; for (i=STbuffer->orig_sg_segs; i < STbuffer->sg_segs; i++) { scsi_init_free(STbuffer->sg[i].address, STbuffer->sg[i].length); STbuffer->buffer_size -= STbuffer->sg[i].length; } #if DEBUG if (debugging && STbuffer->orig_sg_segs < STbuffer->sg_segs) printk(ST_DEB_MSG "st: Buffer at %p normalized to %d bytes (segs %d).\n", STbuffer->b_data, STbuffer->buffer_size, STbuffer->sg_segs); #endif STbuffer->sg_segs = STbuffer->orig_sg_segs; } /* Move data from the user buffer to the tape buffer. Returns zero (success) or negative error code. */ static int append_to_buffer(const char *ubp, ST_buffer *st_bp, int do_count) { int i, cnt, res, offset; for (i=0, offset=st_bp->buffer_bytes; i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++) offset -= st_bp->sg[i].length; if (i == st_bp->sg_segs) { /* Should never happen */ printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); return (-EIO); } for ( ; i < st_bp->sg_segs && do_count > 0; i++) { cnt = st_bp->sg[i].length - offset < do_count ? st_bp->sg[i].length - offset : do_count; res = copy_from_user(st_bp->sg[i].address + offset, ubp, cnt); if (res) return (-EFAULT); do_count -= cnt; st_bp->buffer_bytes += cnt; ubp += cnt; offset = 0; } if (do_count) { /* Should never happen */ printk(KERN_WARNING "st: append_to_buffer overflow (left %d).\n", do_count); return (-EIO); } return 0; } /* Move data from the tape buffer to the user buffer. Returns zero (success) or negative error code. */ static int from_buffer(ST_buffer *st_bp, char *ubp, int do_count) { int i, cnt, res, offset; for (i=0, offset=st_bp->read_pointer; i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++) offset -= st_bp->sg[i].length; if (i == st_bp->sg_segs) { /* Should never happen */ printk(KERN_WARNING "st: from_buffer offset overflow.\n"); return (-EIO); } for ( ; i < st_bp->sg_segs && do_count > 0; i++) { cnt = st_bp->sg[i].length - offset < do_count ? st_bp->sg[i].length - offset : do_count; res = copy_to_user(ubp, st_bp->sg[i].address + offset, cnt); if (res) return (-EFAULT); do_count -= cnt; st_bp->buffer_bytes -= cnt; st_bp->read_pointer += cnt; ubp += cnt; offset = 0; } if (do_count) { /* Should never happen */ printk(KERN_WARNING "st: from_buffer overflow (left %d).\n", do_count); return (-EIO); } return 0; } #ifndef MODULE /* Set the boot options. Syntax: st=xxx,yyy where xxx is buffer size in 1024 byte blocks and yyy is write threshold in 1024 byte blocks. */ __initfunc( void st_setup(char *str, int *ints)) { if (ints[0] > 0 && ints[1] > 0) st_buffer_size = ints[1] * ST_KILOBYTE; if (ints[0] > 1 && ints[2] > 0) { st_write_threshold = ints[2] * ST_KILOBYTE; if (st_write_threshold > st_buffer_size) st_write_threshold = st_buffer_size; } if (ints[0] > 2 && ints[3] > 0) st_max_buffers = ints[3]; } #endif static struct file_operations st_fops = { NULL, /* lseek - default */ st_read, /* read - general block-dev read */ st_write, /* write - general block-dev write */ NULL, /* readdir - bad */ NULL, /* select */ st_ioctl, /* ioctl */ NULL, /* mmap */ scsi_tape_open, /* open */ scsi_tape_flush, /* flush */ scsi_tape_close, /* release */ NULL /* fsync */ }; static int st_attach(Scsi_Device * SDp){ Scsi_Tape * tpnt; ST_mode * STm; ST_partstat * STps; int i; if (SDp->type != TYPE_TAPE) return 1; if (st_template.nr_dev >= st_template.dev_max) { SDp->attached--; return 1; } for(tpnt = scsi_tapes, i=0; idevice) break; if(i >= st_template.dev_max) panic ("scsi_devices corrupt (st)"); scsi_tapes[i].device = SDp; if (SDp->scsi_level <= 2) scsi_tapes[i].mt_status->mt_type = MT_ISSCSI1; else scsi_tapes[i].mt_status->mt_type = MT_ISSCSI2; tpnt->devt = MKDEV(SCSI_TAPE_MAJOR, i); tpnt->dirty = 0; tpnt->in_use = 0; tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; tpnt->density = 0; tpnt->do_auto_lock = ST_AUTO_LOCK; tpnt->can_bsr = ST_IN_FILE_POS; tpnt->can_partitions = 0; tpnt->two_fm = ST_TWO_FM; tpnt->fast_mteom = ST_FAST_MTEOM; tpnt->scsi2_logical = ST_SCSI2LOGICAL; tpnt->write_threshold = st_write_threshold; tpnt->default_drvbuffer = 0xff; /* No forced buffering */ tpnt->partition = 0; tpnt->new_partition = 0; tpnt->nbr_partitions = 0; tpnt->timeout = ST_TIMEOUT; tpnt->long_timeout = ST_LONG_TIMEOUT; for (i=0; i < ST_NBR_MODES; i++) { STm = &(tpnt->modes[i]); STm->defined = FALSE; STm->sysv = ST_SYSV; STm->defaults_for_writes = 0; STm->do_async_writes = ST_ASYNC_WRITES; STm->do_buffer_writes = ST_BUFFER_WRITES; STm->do_read_ahead = ST_READ_AHEAD; STm->default_compression = ST_DONT_TOUCH; STm->default_blksize = (-1); /* No forced size */ STm->default_density = (-1); /* No forced density */ } for (i=0; i < ST_NBR_PARTITIONS; i++) { STps = &(tpnt->ps[i]); STps->rw = ST_IDLE; STps->eof = ST_NOEOF; STps->at_sm = 0; STps->last_block_valid = FALSE; STps->drv_block = (-1); STps->drv_file = (-1); } tpnt->current_mode = 0; tpnt->modes[0].defined = TRUE; tpnt->density_changed = tpnt->compression_changed = tpnt->blksize_changed = FALSE; st_template.nr_dev++; return 0; }; static int st_detect(Scsi_Device * SDp) { if(SDp->type != TYPE_TAPE) return 0; printk(KERN_WARNING "Detected scsi tape st%d at scsi%d, channel %d, id %d, lun %d\n", st_template.dev_noticed++, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun); return 1; } static int st_registered = 0; /* Driver initialization (not __initfunc because may be called later) */ static int st_init() { int i; Scsi_Tape * STp; #if !ST_RUNTIME_BUFFERS int target_nbr; #endif if (st_template.dev_noticed == 0) return 0; if(!st_registered) { if (register_chrdev(SCSI_TAPE_MAJOR,"st",&st_fops)) { printk(KERN_ERR "Unable to get major %d for SCSI tapes\n",MAJOR_NR); return 1; } st_registered++; } if (scsi_tapes) return 0; st_template.dev_max = st_template.dev_noticed + ST_EXTRA_DEVS; if (st_template.dev_max < ST_MAX_TAPES) st_template.dev_max = ST_MAX_TAPES; if (st_template.dev_max > 128 / ST_NBR_MODES) printk(KERN_INFO "st: Only %d tapes accessible.\n", 128 / ST_NBR_MODES); scsi_tapes = (Scsi_Tape *) scsi_init_malloc(st_template.dev_max * sizeof(Scsi_Tape), GFP_ATOMIC); if (scsi_tapes == NULL) { printk(KERN_ERR "Unable to allocate descriptors for SCSI tapes.\n"); unregister_chrdev(SCSI_TAPE_MAJOR, "st"); return 1; } #if DEBUG printk(ST_DEB_MSG "st: Buffer size %d bytes, write threshold %d bytes.\n", st_buffer_size, st_write_threshold); #endif memset(scsi_tapes, 0, st_template.dev_max * sizeof(Scsi_Tape)); for (i=0; i < st_template.dev_max; ++i) { STp = &(scsi_tapes[i]); STp->capacity = 0xfffff; STp->mt_status = (struct mtget *) scsi_init_malloc(sizeof(struct mtget), GFP_ATOMIC); /* Initialize status */ memset((void *) scsi_tapes[i].mt_status, 0, sizeof(struct mtget)); } /* Allocate the buffers */ st_buffers = (ST_buffer **) scsi_init_malloc(st_template.dev_max * sizeof(ST_buffer *), GFP_ATOMIC); if (st_buffers == NULL) { printk(KERN_ERR "Unable to allocate tape buffer pointers.\n"); unregister_chrdev(SCSI_TAPE_MAJOR, "st"); scsi_init_free((char *) scsi_tapes, st_template.dev_max * sizeof(Scsi_Tape)); return 1; } #if ST_RUNTIME_BUFFERS st_nbr_buffers = 0; #else target_nbr = st_template.dev_noticed; if (target_nbr < ST_EXTRA_DEVS) target_nbr = ST_EXTRA_DEVS; if (target_nbr > st_max_buffers) target_nbr = st_max_buffers; for (i=st_nbr_buffers=0; i < target_nbr; i++) { if (!new_tape_buffer(TRUE, TRUE)) { if (i == 0) { #if 0 printk(KERN_ERR "Can't continue without at least one tape buffer.\n"); unregister_chrdev(SCSI_TAPE_MAJOR, "st"); scsi_init_free((char *) st_buffers, st_template.dev_max * sizeof(ST_buffer *)); scsi_init_free((char *) scsi_tapes, st_template.dev_max * sizeof(Scsi_Tape)); return 1; #else printk(KERN_INFO "No tape buffers allocated at initialization.\n"); break; #endif } printk(KERN_INFO "Number of tape buffers adjusted.\n"); break; } } #endif return 0; } static void st_detach(Scsi_Device * SDp) { Scsi_Tape * tpnt; int i; for(tpnt = scsi_tapes, i=0; idevice == SDp) { tpnt->device = NULL; SDp->attached--; st_template.nr_dev--; st_template.dev_noticed--; return; } return; } #ifdef MODULE int init_module(void) { int result; if (buffer_kbs > 0) st_buffer_size = buffer_kbs * ST_KILOBYTE; if (write_threshold_kbs > 0) st_write_threshold = write_threshold_kbs * ST_KILOBYTE; if (st_write_threshold > st_buffer_size) st_write_threshold = st_buffer_size; if (max_buffers > 0) st_max_buffers = max_buffers; if (max_sg_segs >= ST_FIRST_SG) st_max_sg_segs = max_sg_segs; printk(KERN_INFO "st: bufsize %d, wrt %d, max buffers %d, s/g segs %d.\n", st_buffer_size, st_write_threshold, st_max_buffers, st_max_sg_segs); st_template.module = &__this_module; result = scsi_register_module(MODULE_SCSI_DEV, &st_template); if (result) return result; return 0; } void cleanup_module( void) { int i, j; scsi_unregister_module(MODULE_SCSI_DEV, &st_template); unregister_chrdev(SCSI_TAPE_MAJOR, "st"); st_registered--; if(scsi_tapes != NULL) { scsi_init_free((char *) scsi_tapes, st_template.dev_max * sizeof(Scsi_Tape)); if (st_buffers != NULL) { for (i=0; i < st_nbr_buffers; i++) if (st_buffers[i] != NULL) { for (j=0; j < st_buffers[i]->sg_segs; j++) scsi_init_free((char *) st_buffers[i]->sg[j].address, st_buffers[i]->sg[j].length); scsi_init_free((char *) st_buffers[i], st_buffers[i]->this_size); } scsi_init_free((char *) st_buffers, st_template.dev_max * sizeof(ST_buffer *)); } } st_template.dev_max = 0; printk(KERN_INFO "st: Unloaded.\n"); } #endif /* MODULE */