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[/] [or1k/] [trunk/] [rc203soc/] [sw/] [uClinux/] [drivers/] [scsi/] [st.c] - Rev 1626
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/* 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, Eyal Lebedinsky, J"org Weule, and Eric Youngdale. Copyright 1992 - 1996 Kai Makisara email Kai.Makisara@metla.fi Last modified: Tue Oct 1 22:53:51 1996 by makisara@kai.makisara.fi Some small formal changes - aeb, 950809 */ #include <linux/module.h> #include <linux/fs.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/mm.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/mtio.h> #include <linux/ioctl.h> #include <linux/fcntl.h> #include <asm/segment.h> #include <asm/dma.h> #include <asm/system.h> /* 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 <linux/blk.h> #include "scsi.h" #include "hosts.h" #include <scsi/scsi_ioctl.h> #include "st.h" #include "constants.h" /* The default definitions have been moved to st_options.h */ #define ST_BLOCK_SIZE 1024 #include "st_options.h" #define ST_BUFFER_SIZE (ST_BUFFER_BLOCKS * ST_BLOCK_SIZE) #define ST_WRITE_THRESHOLD (ST_WRITE_THRESHOLD_BLOCKS * ST_BLOCK_SIZE) /* 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; 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 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 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 printk("\n"); } #endif scode = sense[2] & 0x0f; #if !DEBUG 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.\n", dev, result); } #endif 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; if ((STp->buffer)->writing) { /* Process errors before releasing request */ (STp->buffer)->last_result_fatal = st_chk_result(SCpnt); SCpnt->request.rq_status = RQ_INACTIVE; } else SCpnt->request.rq_status = RQ_SCSI_DONE; #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 */ static Scsi_Cmnd * st_do_scsi(Scsi_Cmnd *SCpnt, Scsi_Tape *STp, unsigned char *cmd, int bytes, int timeout, int retries) { if (SCpnt == NULL) if ((SCpnt = allocate_device(NULL, STp->device, 1)) == NULL) { printk(KERN_ERR "st%d: Can't get SCSI request.\n", TAPE_NR(STp->devt)); return NULL; } cmd[1] |= (SCpnt->lun << 5) & 0xe0; STp->sem = MUTEX_LOCKED; SCpnt->request.sem = &(STp->sem); SCpnt->request.rq_status = RQ_SCSI_BUSY; SCpnt->request.rq_dev = STp->devt; scsi_do_cmd(SCpnt, (void *)cmd, (STp->buffer)->b_data, bytes, st_sleep_done, timeout, retries); down(SCpnt->request.sem); (STp->buffer)->last_result_fatal = st_chk_result(SCpnt); return SCpnt; } /* Handle the write-behind checking */ static void write_behind_check(Scsi_Tape *STp) { ST_buffer * STbuffer; STbuffer = STp->buffer; #if DEBUG if (STp->write_pending) STp->nbr_waits++; else STp->nbr_finished++; #endif down(&(STp->sem)); if (STbuffer->writing < STbuffer->buffer_bytes) memcpy(STbuffer->b_data, STbuffer->b_data + STbuffer->writing, STbuffer->buffer_bytes - STbuffer->writing); STbuffer->buffer_bytes -= STbuffer->writing; if (STp->drv_block >= 0) { if (STp->block_size == 0) STp->drv_block++; else STp->drv_block += STbuffer->writing / STp->block_size; } STbuffer->writing = 0; return; } /* Back over EOF if it has been inadvertently crossed (ioctl not used because it messes up the block number). */ static int back_over_eof(Scsi_Tape *STp) { Scsi_Cmnd *SCpnt; unsigned char cmd[10]; cmd[0] = SPACE; cmd[1] = 0x01; /* Space FileMarks */ cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ cmd[5] = 0; SCpnt = st_do_scsi(NULL, STp, cmd, 0, ST_TIMEOUT, MAX_RETRIES); if (!SCpnt) return (-EBUSY); SCpnt->request.rq_status = RQ_INACTIVE; if ((STp->buffer)->last_result != 0) { printk(KERN_ERR "st%d: Backing over filemark failed.\n", TAPE_NR(STp->devt)); if ((STp->mt_status)->mt_fileno >= 0) (STp->mt_status)->mt_fileno += 1; (STp->mt_status)->mt_blkno = 0; } 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; 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, ST_TIMEOUT, MAX_WRITE_RETRIES); if (!SCpnt) return (-EBUSY); 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); } STp->drv_block = (-1); } else { if (STp->drv_block >= 0) STp->drv_block += blks; STp->dirty = 0; (STp->buffer)->buffer_bytes = 0; } SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ } 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; 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; if (STp->ps[STp->partition].rw == ST_WRITING) /* Writing */ return flush_write_buffer(STp); if (STp->block_size == 0) { STp->eof = ST_NOEOF; STp->eof_hit = 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 ((STp->eof == ST_FM) && !STp->eof_hit) { result = back_over_eof(STp); /* Back over the EOF hit */ if (!result) { STp->eof = ST_NOEOF; STp->eof_hit = 0; } } if (!result && backspace > 0) result = st_int_ioctl(inode, MTBSR, backspace); } else if ((STp->eof == ST_FM) && !STp->eof_hit) { if ((STp->mt_status)->mt_fileno >= 0) (STp->mt_status)->mt_fileno++; STp->drv_block = 0; } 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; 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); 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 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; flags = filp->f_flags; STp->write_prot = ((flags & O_ACCMODE) == O_RDONLY); STp->dirty = 0; for (i=0; i < ST_NBR_PARTITIONS; i++) STp->ps[i].rw = ST_IDLE; STp->ready = ST_READY; if (STp->eof != ST_EOD) /* Save EOD across opens */ STp->eof = ST_NOEOF; STp->eof_hit = 0; STp->recover_count = 0; #if DEBUG STp->nbr_waits = STp->nbr_finished = 0; #endif if (scsi_tapes[dev].device->host->hostt->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)++; if(st_template.usage_count) (*st_template.usage_count)++; memset ((void *) &cmd[0], 0, 10); cmd[0] = TEST_UNIT_READY; SCpnt = st_do_scsi(NULL, STp, cmd, 0, ST_LONG_TIMEOUT, MAX_READY_RETRIES); if (!SCpnt) { if (scsi_tapes[dev].device->host->hostt->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)--; if(st_template.usage_count) (*st_template.usage_count)--; return (-EBUSY); } if ((SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */ (STp->mt_status)->mt_fileno = 0 ; memset ((void *) &cmd[0], 0, 10); cmd[0] = TEST_UNIT_READY; SCpnt = st_do_scsi(SCpnt, STp, cmd, 0, ST_LONG_TIMEOUT, MAX_READY_RETRIES); (STp->mt_status)->mt_fileno = STp->drv_block = 0; STp->eof = ST_NOEOF; (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++) { STp->ps[i].rw = ST_IDLE; STp->ps[i].moves_after_eof = 1; STp->ps[i].at_sm = 0; STp->ps[i].last_block_valid = FALSE; } new_session = TRUE; } if ((STp->buffer)->last_result_fatal != 0) { if ((SCpnt->sense_buffer[0] & 0x70) == 0x70 && (SCpnt->sense_buffer[2] & 0x0f) == NO_TAPE) { (STp->mt_status)->mt_fileno = STp->drv_block = 0 ; STp->ready = ST_NO_TAPE; } else { (STp->mt_status)->mt_fileno = STp->drv_block = (-1); STp->ready = ST_NOT_READY; } SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ STp->density = 0; /* Clear the erroneous "residue" */ STp->write_prot = 0; STp->block_size = 0; STp->eof = ST_NOEOF; (STp->mt_status)->mt_fileno = STp->drv_block = 0; 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, ST_TIMEOUT, MAX_READY_RETRIES); 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, ST_TIMEOUT, MAX_READY_RETRIES); 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); (STp->buffer)->in_use = 0; STp->buffer = NULL; if (scsi_tapes[dev].device->host->hostt->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)--; if(st_template.usage_count) (*st_template.usage_count)--; return (-EIO); } STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; } SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ if (STp->block_size > 0) (STp->buffer)->buffer_blocks = st_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->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)--; if(st_template.usage_count) (*st_template.usage_count)--; 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->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)--; if(st_template.usage_count) (*st_template.usage_count)--; 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->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)--; if(st_template.usage_count) (*st_template.usage_count)--; 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; } /* Close the device*/ static void scsi_tape_close(struct inode * inode, struct file * filp) { int result; static unsigned char cmd[10]; Scsi_Cmnd * SCpnt; Scsi_Tape * STp; kdev_t devt = inode->i_rdev; int dev; dev = TAPE_NR(devt); STp = &(scsi_tapes[dev]); if (STp->can_partitions && 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 ( STp->ps[STp->partition].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, ST_TIMEOUT, MAX_WRITE_RETRIES); if (!SCpnt) goto out; SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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 */ printk(KERN_ERR "st%d: Error on write filemark.\n", dev); else { if ((STp->mt_status)->mt_fileno >= 0) (STp->mt_status)->mt_fileno++ ; STp->drv_block = 0; if (STp->two_fm) back_over_eof(STp); } } #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) { if (STp->can_bsr) flush_buffer(inode, filp, 0); else if ((STp->eof == ST_FM) && !STp->eof_hit) back_over_eof(STp); } out: if (STp->rew_at_close) st_int_ioctl(inode, MTREW, 1); 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->usage_count) (*scsi_tapes[dev].device->host->hostt->usage_count)--; if(st_template.usage_count) (*st_template.usage_count)--; return; } /* Write command */ static int st_write(struct inode * inode, struct file * filp, const char * buf, int count) { int total, 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 (STp->ready != ST_READY) return (-EIO); STm = &(STp->modes[STp->current_mode]); if (!STm->defined) return (-ENXIO); /* * 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 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 && (STp->mt_status)->mt_fileno == 0 && STp->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 (STps->moves_after_eof < 255) STps->moves_after_eof++; 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) { retval = (-ENOSPC); /* All has been written */ STp->eof = ST_EOM_OK; } else retval = (-EIO); return retval; } } if (STp->eof == ST_EOM_OK) return (-ENOSPC); else if (STp->eof == ST_EOM_ERROR) return (-EIO); if (!STm->do_buffer_writes) { if (STp->block_size != 0 && (count % STp->block_size) != 0) return (-EIO); /* Write must be integral number of blocks */ 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; } memcpy_fromfs((STp->buffer)->b_data + (STp->buffer)->buffer_bytes, b_point, do_count); if (STp->block_size == 0) blks = transfer = do_count; else { blks = ((STp->buffer)->buffer_bytes + do_count) / 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, ST_TIMEOUT, MAX_WRITE_RETRIES); 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 (STp->drv_block >= 0) { if (STp->block_size == 0 && transfer < do_count) STp->drv_block++; else if (STp->block_size != 0) STp->drv_block += (do_count - transfer) / STp->block_size; } STp->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 { STp->eof = ST_EOM_ERROR; STp->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 { STp->drv_block = (-1); /* Too cautious? */ retval = (-EIO); } SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ (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 (STp->drv_block >= 0) { if (STp->block_size == 0) STp->drv_block++; else STp->drv_block += blks; } (STp->buffer)->buffer_bytes = 0; STp->dirty = 0; } if (count != 0) { STp->dirty = 1; memcpy_fromfs((STp->buffer)->b_data + (STp->buffer)->buffer_bytes,b_point,count); filp->f_pos += count; (STp->buffer)->buffer_bytes += count; count = 0; } if (doing_write && (STp->buffer)->last_result_fatal != 0) { SCpnt->request.rq_status = RQ_INACTIVE; 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 (!SCpnt) { SCpnt = allocate_device(NULL, STp->device, 1); if (!SCpnt) return (-EBUSY); } 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; STp->sem = MUTEX_LOCKED; SCpnt->request.sem = &(STp->sem); SCpnt->request.rq_status = RQ_SCSI_BUSY; SCpnt->request.rq_dev = STp->devt; #if DEBUG STp->write_pending = 1; #endif scsi_do_cmd (SCpnt, (void *) cmd, (STp->buffer)->b_data, (STp->buffer)->writing, st_sleep_done, ST_TIMEOUT, MAX_WRITE_RETRIES); } else if (SCpnt != NULL) SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ STps->at_sm &= (total == 0); return( total); } /* Read command */ static int st_read(struct inode * inode, struct file * filp, char * buf, int count) { int total; int transfer, blks, bytes; static unsigned char cmd[10]; 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 (STp->ready != ST_READY) 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; STps = &(STp->ps[STp->partition]); 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; if (STps->rw == ST_WRITING) { transfer = flush_buffer(inode, filp, 0); if (transfer) return transfer; STps->rw = ST_READING; } if (STps->moves_after_eof < 255) STps->moves_after_eof++; #if DEBUG if (debugging && STp->eof != ST_NOEOF) printk(ST_DEB_MSG "st%d: EOF flag up. Bytes %d\n", dev, (STp->buffer)->buffer_bytes); #endif if (((STp->buffer)->buffer_bytes == 0) && (STp->eof == ST_EOM_OK || STp->eof == ST_EOD)) return (-EIO); /* EOM or Blank Check */ STps->rw = ST_READING; for (total = 0; total < count; ) { if ((STp->buffer)->buffer_bytes == 0 && STp->eof == ST_NOEOF) { 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 - total; 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 = st_do_scsi(SCpnt, STp, cmd, bytes, ST_TIMEOUT, MAX_RETRIES); if (!SCpnt) return (-EBUSY); (STp->buffer)->read_pointer = 0; STp->eof_hit = 0; STps->at_sm = 0; if ((STp->buffer)->last_result_fatal) { #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 */ 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) { if (STp->block_size == 0) { if (transfer <= 0) transfer = 0; (STp->buffer)->buffer_bytes = bytes - transfer; } else { SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ if (transfer == blks) { /* We did not get anything, signal error */ printk(KERN_NOTICE "st%d: Incorrect block size.\n", dev); if (STp->drv_block >= 0) STp->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 %d %d.\n", dev, count - total, (STp->buffer)->buffer_bytes); #endif if (count - total > (STp->buffer)->buffer_bytes) count = total + (STp->buffer)->buffer_bytes; if (STp->drv_block >= 0) STp->drv_block += 1; if (st_int_ioctl(inode, MTBSR, 1)) return (-EIO); SCpnt = NULL; } } else if (SCpnt->sense_buffer[2] & 0x80) { /* FM overrides EOM */ STp->eof = ST_FM; 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, transferred %d bytes).\n", dev, (STp->buffer)->buffer_bytes, total); #endif } else if (SCpnt->sense_buffer[2] & 0x40) { STp->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 SCpnt->request.rq_status = RQ_INACTIVE; STp->drv_block = (-1); if (total) return total; else if (STps->moves_after_eof == 1 && (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 STp->eof = ST_EOD; return 0; /* First BLANK_CHECK after EOF */ } else return -EIO; } } /* End of extended sense test */ else { transfer = (STp->buffer)->last_result_fatal; SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ return transfer; } } /* End of error handling */ else /* Read successful */ (STp->buffer)->buffer_bytes = bytes; if (STp->drv_block >= 0) { if (STp->block_size == 0) STp->drv_block++; else STp->drv_block += (STp->buffer)->buffer_bytes / STp->block_size; } } /* if ((STp->buffer)->buffer_bytes == 0 && STp->eof == ST_NOEOF) */ if ((STp->buffer)->buffer_bytes > 0) { #if DEBUG if (debugging && STp->eof != ST_NOEOF) printk(ST_DEB_MSG "st%d: EOF up. Left %d, needed %d.\n", dev, (STp->buffer)->buffer_bytes, count - total); #endif transfer = (STp->buffer)->buffer_bytes < count - total ? (STp->buffer)->buffer_bytes : count - total; memcpy_tofs(buf, (STp->buffer)->b_data + (STp->buffer)->read_pointer,transfer); filp->f_pos += transfer; buf += transfer; total += transfer; (STp->buffer)->buffer_bytes -= transfer; (STp->buffer)->read_pointer += transfer; } else if (STp->eof != ST_NOEOF) { STp->eof_hit = 1; if (SCpnt != NULL) SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ if (total == 0 && STp->eof == ST_FM) { STp->eof = ST_NOEOF; STp->eof_hit = 0; STp->drv_block = 0; if (STps->moves_after_eof > 1) STps->moves_after_eof = 0; if ((STp->mt_status)->mt_fileno >= 0) (STp->mt_status)->mt_fileno++; } if (total == 0 && STp->eof == ST_EOM_OK) return (-ENOSPC); /* ST_EOM_ERROR not used in read */ return total; } if (STp->block_size == 0) count = total; /* Read only one variable length block */ } /* for (total = 0; total < count; ) */ if (SCpnt != NULL) SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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); #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; #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 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_BLOCK_SIZE; 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_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], ST_TIMEOUT, 0); 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 SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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 SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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], ST_TIMEOUT, 0); if ((STp->buffer)->last_result_fatal != 0) { #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression change failed.\n", dev); #endif SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ return (-EIO); } #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Compression state changed to %d.\n", dev, state); #endif SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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 = ST_LONG_TIMEOUT; long ltmp; int i, ioctl_result; 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) return (-EIO); STps = &(STp->ps[STp->partition]); fileno = (STp->mt_status)->mt_fileno ; blkno = STp->drv_block; at_sm = STps->at_sm; memset(cmd, 0, 10); datalen = 0; switch (cmd_in) { case MTFSF: case MTFSFM: 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 MTBSF: case MTBSFM: 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 = ST_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 = ST_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 ST_NOWAIT cmd[1] = 1; /* Don't wait for completion */ timeout = ST_TIMEOUT; #else timeout = ST_LONG_TIMEOUT * 8; #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 = ST_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 = (STp->mt_status)->mt_fileno ; if (STp->eof == ST_EOD || STp->eof == ST_EOM_OK) 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 = ST_TIMEOUT; #else timeout = ST_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: 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: 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 */ 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 = ST_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); if (!SCpnt) return (-EBUSY); ioctl_result = (STp->buffer)->last_result_fatal; SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ if (cmd_in == MTFSF) STps->moves_after_eof = 0; else if (cmd_in != MTLOAD && cmd_in != MTLOCK && cmd_in != MTUNLOCK && cmd_in != MTSETBLK && cmd_in != MTSETDENSITY && cmd_in != MTSETDRVBUFFER) STps->moves_after_eof = 1; if (!ioctl_result) { /* SCSI command successful */ STp->drv_block = blkno; (STp->mt_status)->mt_fileno = 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); else 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; } else if (cmd_in == MTSETDRVBUFFER) STp->drv_buffer = (arg & 7); else if (cmd_in == MTSETDENSITY) STp->density = arg; else if (cmd_in == MTEOM) { STp->eof = ST_EOD; STp->eof_hit = 0; } else if (cmd_in != MTSETBLK && cmd_in != MTNOP) { STp->eof = ST_NOEOF; STp->eof_hit = 0; } if (cmd_in == SET_DENS_AND_BLK) STp->density = arg >> MT_ST_DENSITY_SHIFT; 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].moves_after_eof = 1; STp->ps[i].last_block_valid = FALSE; } STp->partition = 0; } } else { /* SCSI command was not completely successful */ if (SCpnt->sense_buffer[2] & 0x40) { if (cmd_in != MTBSF && cmd_in != MTBSFM && cmd_in != MTBSR && cmd_in != MTBSS) STp->eof = ST_EOM_OK; STp->eof_hit = 0; STp->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++; (STp->mt_status)->mt_fileno = fileno; } else if ( (cmd_in == MTFSF) || (cmd_in == MTFSFM) ) { if (fileno >= 0) (STp->mt_status)->mt_fileno = fileno - undone ; else (STp->mt_status)->mt_fileno = fileno; STp->drv_block = 0; } else if ( (cmd_in == MTBSF) || (cmd_in == MTBSFM) ) { (STp->mt_status)->mt_fileno = fileno + undone ; STp->drv_block = 0; } else if (cmd_in == MTFSR) { if (SCpnt->sense_buffer[2] & 0x80) { /* Hit filemark */ (STp->mt_status)->mt_fileno++; STp->drv_block = 0; } else { if (blkno >= undone) STp->drv_block = blkno - undone; else STp->drv_block = (-1); } } else if (cmd_in == MTBSR) { if (SCpnt->sense_buffer[2] & 0x80) { /* Hit filemark */ (STp->mt_status)->mt_fileno--; STp->drv_block = (-1); } else { if (blkno >= 0) STp->drv_block = blkno + undone; else STp->drv_block = (-1); } } else if (cmd_in == MTEOM) { (STp->mt_status)->mt_fileno = (-1); STp->drv_block = (-1); } if (STp->eof == ST_NOEOF && (SCpnt->sense_buffer[2] & 0x0f) == BLANK_CHECK) STp->eof = ST_EOD; if (cmd_in == MTLOCK) STp->door_locked = ST_LOCK_FAILS; } 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, ST_TIMEOUT, MAX_READY_RETRIES); 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->drv_block = (STp->mt_status)->mt_fileno = 0; } #if DEBUG if (debugging) printk(ST_DEB_MSG "st%d: Got tape pos. blk %d part %d.\n", dev, *block, *partition); #endif } SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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 = ST_LONG_TIMEOUT; unsigned char scmd[10]; Scsi_Cmnd *SCpnt; STp = &(scsi_tapes[dev]); if (STp->ready != ST_READY) return (-EIO); 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 = ST_TIMEOUT; #endif SCpnt = st_do_scsi(NULL, STp, scmd, 20, timeout, MAX_READY_RETRIES); if (!SCpnt) return (-EBUSY); STp->drv_block = (STp->mt_status)->mt_fileno = (-1); STp->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->moves_after_eof = 1; STps->at_sm = 0; STps->rw = ST_IDLE; } } else STps->at_sm = 0; if (block == 0) STp->drv_block = (STp->mt_status)->mt_fileno = 0; result = 0; } SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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, ST_TIMEOUT, MAX_READY_RETRIES); if (SCpnt == NULL) return (-EBUSY); SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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], ST_LONG_TIMEOUT, MAX_READY_RETRIES); if (SCpnt == NULL) return (-EBUSY); SCpnt->request.rq_status = RQ_INACTIVE; /* Mark as not busy */ 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]); 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 = verify_area(VERIFY_READ, (void *)arg, sizeof(mtc)); if (i) return i; memcpy_fromfs((char *) &mtc, (char *)arg, sizeof(struct mtop)); if (mtc.mt_op == MTSETDRVBUFFER && !suser()) { 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 (STp->eof_hit) { if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM|| mtc.mt_op == MTEOM) { mtc.mt_count -= 1; if ((STp->mt_status)->mt_fileno >= 0) (STp->mt_status)->mt_fileno += 1; } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { mtc.mt_count += 1; if ((STp->mt_status)->mt_fileno >= 0) (STp->mt_status)->mt_fileno += 1; } } i = flush_buffer(inode, file, /* mtc.mt_op == MTSEEK || */ 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); 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 != MTSEEK && mtc.mt_op != MTSETPART) STps->rw = ST_IDLE; /* Prevent automatic WEOF */ 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].moves_after_eof = 1; 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 ?-) */ STp->drv_block = (STp->mt_status)->mt_fileno = 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); i = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct mtget)); if (i) return i; (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 = STp->drv_block; 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 (STp->eof == ST_EOM_OK || STp->eof == ST_EOM_ERROR) (STp->mt_status)->mt_gstat |= GMT_EOT(0xffffffff); else if (STp->eof == ST_EOD) (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); memcpy_tofs((char *)arg, (char *)(STp->mt_status), sizeof(struct mtget)); (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; i = verify_area(VERIFY_WRITE, (void *)arg, sizeof(mt_pos)); if (i) return i; mt_pos.mt_blkno = blk; memcpy_tofs((char *)arg, (char *) (&mt_pos), sizeof(struct mtpos)); 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 priority, a_size; ST_buffer *tb; if (st_nbr_buffers >= st_template.dev_max) return NULL; /* Should never happen */ if (from_initialization) { priority = GFP_ATOMIC; a_size = st_buffer_size; } else { priority = GFP_KERNEL; for (a_size = PAGE_SIZE; a_size < st_buffer_size; a_size <<= 1) ; /* Make sure we allocate efficiently */ } tb = (ST_buffer *)scsi_init_malloc(sizeof(ST_buffer), priority); if (tb) { if (need_dma) priority |= GFP_DMA; tb->b_data = (unsigned char *)scsi_init_malloc(a_size, priority); if (!tb->b_data) { scsi_init_free((char *)tb, sizeof(ST_buffer)); tb = NULL; } } if (!tb) { printk(KERN_NOTICE "st: Can't allocate new tape buffer (nbr %d).\n", st_nbr_buffers); return NULL; } #if DEBUG if (debugging) printk(ST_DEB_MSG "st: Allocated tape buffer %d (%d bytes, dma: %d, a: %p).\n", st_nbr_buffers, a_size, need_dma, tb->b_data); #endif tb->in_use = 0; tb->dma = need_dma; tb->buffer_size = a_size; tb->writing = 0; tb->orig_b_data = NULL; 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 a_size, priority; unsigned char *tbd; normalize_buffer(STbuffer); for (a_size = PAGE_SIZE; a_size < new_size; a_size <<= 1) ; /* Make sure that we allocate efficiently */ priority = GFP_KERNEL; if (need_dma) priority |= GFP_DMA; tbd = (unsigned char *)scsi_init_malloc(a_size, priority); if (!tbd) return FALSE; #if DEBUG if (debugging) printk(ST_DEB_MSG "st: Buffer at %p enlarged to %d bytes (dma: %d, a: %p).\n", STbuffer->b_data, a_size, need_dma, tbd); #endif STbuffer->orig_b_data = STbuffer->b_data; STbuffer->orig_size = STbuffer->buffer_size; STbuffer->b_data = tbd; STbuffer->buffer_size = a_size; return TRUE; } /* Release the extra buffer */ static void normalize_buffer(ST_buffer *STbuffer) { if (STbuffer->orig_b_data == NULL) return; scsi_init_free(STbuffer->b_data, STbuffer->buffer_size); STbuffer->b_data = STbuffer->orig_b_data; STbuffer->orig_b_data = NULL; STbuffer->buffer_size = STbuffer->orig_size; #if DEBUG if (debugging) printk(ST_DEB_MSG "st: Buffer at %p normalized to %d bytes.\n", STbuffer->b_data, STbuffer->buffer_size); #endif } /* 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. */ void st_setup(char *str, int *ints) { if (ints[0] > 0 && ints[1] > 0) st_buffer_size = ints[1] * ST_BLOCK_SIZE; if (ints[0] > 1 && ints[2] > 0) { st_write_threshold = ints[2] * ST_BLOCK_SIZE; 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]; } 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_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; i<st_template.dev_max; i++, tpnt++) if(!tpnt->device) 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->eof = ST_NOEOF; tpnt->waiting = NULL; 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 = 0; 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->drv_block = (-1); (tpnt->mt_status)->mt_fileno = (tpnt->mt_status)->mt_blkno = (-1); for (i=0; i < ST_NBR_MODES; i++) { STm = &(tpnt->modes[i]); STm->defined = FALSE; 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->moves_after_eof = 1; STps->at_sm = 0; STps->last_block_valid = FALSE; } 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_INFO "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 */ 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; i<st_template.dev_max; i++, tpnt++) if(tpnt->device == SDp) { tpnt->device = NULL; SDp->attached--; st_template.nr_dev--; st_template.dev_noticed--; return; } return; } #ifdef MODULE int init_module(void) { st_template.usage_count = &mod_use_count_; return scsi_register_module(MODULE_SCSI_DEV, &st_template); } void cleanup_module( void) { int i; 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) { scsi_init_free((char *) st_buffers[i]->b_data, st_buffers[i]->buffer_size); scsi_init_free((char *) st_buffers[i], sizeof(ST_buffer)); } 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 */
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