diff options
Diffstat (limited to 'drivers/scsi/osst.c')
| -rw-r--r-- | drivers/scsi/osst.c | 5914 |
1 files changed, 5914 insertions, 0 deletions
diff --git a/drivers/scsi/osst.c b/drivers/scsi/osst.c new file mode 100644 index 0000000..c585c7b --- /dev/null +++ b/drivers/scsi/osst.c @@ -0,0 +1,5914 @@ +/* + SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying + file Documentation/scsi/st.txt for more information. + + History: + + OnStream SCSI Tape support (osst) cloned from st.c by + Willem Riede (osst@riede.org) Feb 2000 + Fixes ... Kurt Garloff <garloff@suse.de> Mar 2000 + + 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 - 2002 Kai Makisara / 2000 - 2004 Willem Riede + email osst@riede.org + + $Header: /cvsroot/osst/Driver/osst.c,v 1.73 2005/01/01 21:13:34 wriede Exp $ + + Microscopic alterations - Rik Ling, 2000/12/21 + Last st.c sync: Tue Oct 15 22:01:04 2002 by makisara + Some small formal changes - aeb, 950809 +*/ + +static const char * cvsid = "$Id: osst.c,v 1.73 2005/01/01 21:13:34 wriede Exp $"; +static const char * osst_version = "0.99.3"; + +/* The "failure to reconnect" firmware bug */ +#define OSST_FW_NEED_POLL_MIN 10601 /*(107A)*/ +#define OSST_FW_NEED_POLL_MAX 10704 /*(108D)*/ +#define OSST_FW_NEED_POLL(x,d) ((x) >= OSST_FW_NEED_POLL_MIN && (x) <= OSST_FW_NEED_POLL_MAX && d->host->this_id != 7) + +#include <linux/module.h> + +#include <linux/fs.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/proc_fs.h> +#include <linux/mm.h> +#include <linux/init.h> +#include <linux/string.h> +#include <linux/errno.h> +#include <linux/mtio.h> +#include <linux/ioctl.h> +#include <linux/fcntl.h> +#include <linux/spinlock.h> +#include <linux/vmalloc.h> +#include <linux/blkdev.h> +#include <linux/moduleparam.h> +#include <linux/devfs_fs_kernel.h> +#include <linux/delay.h> +#include <asm/uaccess.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 OSST_DEB_MSG KERN_NOTICE + +#include <scsi/scsi.h> +#include <scsi/scsi_dbg.h> +#include <scsi/scsi_device.h> +#include <scsi/scsi_driver.h> +#include <scsi/scsi_eh.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_ioctl.h> +#include <scsi/scsi_request.h> + +#define ST_KILOBYTE 1024 + +#include "st.h" +#include "osst.h" +#include "osst_options.h" +#include "osst_detect.h" + +static int max_dev = 0; +static int write_threshold_kbs = 0; +static int max_sg_segs = 0; + +#ifdef MODULE +MODULE_AUTHOR("Willem Riede"); +MODULE_DESCRIPTION("OnStream {DI-|FW-|SC-|USB}{30|50} Tape Driver"); +MODULE_LICENSE("GPL"); + +module_param(max_dev, int, 0444); +MODULE_PARM_DESC(max_dev, "Maximum number of OnStream Tape Drives to attach (4)"); + +module_param(write_threshold_kbs, int, 0644); +MODULE_PARM_DESC(write_threshold_kbs, "Asynchronous write threshold (KB; 32)"); + +module_param(max_sg_segs, int, 0644); +MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (9)"); +#else +static struct osst_dev_parm { + char *name; + int *val; +} parms[] __initdata = { + { "max_dev", &max_dev }, + { "write_threshold_kbs", &write_threshold_kbs }, + { "max_sg_segs", &max_sg_segs } +}; +#endif + +static char *osst_formats[ST_NBR_MODES] ={"", "l", "m", "a"}; + +/* Some default definitions have been moved to osst_options.h */ +#define OSST_BUFFER_SIZE (OSST_BUFFER_BLOCKS * ST_KILOBYTE) +#define OSST_WRITE_THRESHOLD (OSST_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 OSST_BUFFER_SIZE >= (2 << 24 - 1) +#error "Buffer size should not exceed (2 << 24 - 1) bytes!" +#endif + +#if DEBUG +static int debugging = 1; +/* uncomment define below to test error recovery */ +// #define OSST_INJECT_ERRORS 1 +#endif + +/* Do not retry! The drive firmware already retries when appropriate, + and when it tries to tell us something, we had better listen... */ +#define MAX_RETRIES 0 + +#define NO_TAPE NOT_READY + +#define OSST_WAIT_POSITION_COMPLETE (HZ > 200 ? HZ / 200 : 1) +#define OSST_WAIT_WRITE_COMPLETE (HZ / 12) +#define OSST_WAIT_LONG_WRITE_COMPLETE (HZ / 2) + +#define OSST_TIMEOUT (200 * HZ) +#define OSST_LONG_TIMEOUT (1800 * HZ) + +#define TAPE_NR(x) (iminor(x) & ~(-1 << ST_MODE_SHIFT)) +#define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) +#define TAPE_REWIND(x) ((iminor(x) & 0x80) == 0) +#define TAPE_IS_RAW(x) (TAPE_MODE(x) & (ST_NBR_MODES >> 1)) + +/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower + 24 bits) */ +#define SET_DENS_AND_BLK 0x10001 + +static int osst_buffer_size = OSST_BUFFER_SIZE; +static int osst_write_threshold = OSST_WRITE_THRESHOLD; +static int osst_max_sg_segs = OSST_MAX_SG; +static int osst_max_dev = OSST_MAX_TAPES; +static int osst_nr_dev; + +static struct osst_tape **os_scsi_tapes = NULL; +static DEFINE_RWLOCK(os_scsi_tapes_lock); + +static int modes_defined = 0; + +static struct osst_buffer *new_tape_buffer(int, int, int); +static int enlarge_buffer(struct osst_buffer *, int); +static void normalize_buffer(struct osst_buffer *); +static int append_to_buffer(const char __user *, struct osst_buffer *, int); +static int from_buffer(struct osst_buffer *, char __user *, int); +static int osst_zero_buffer_tail(struct osst_buffer *); +static int osst_copy_to_buffer(struct osst_buffer *, unsigned char *); +static int osst_copy_from_buffer(struct osst_buffer *, unsigned char *); + +static int osst_probe(struct device *); +static int osst_remove(struct device *); + +static struct scsi_driver osst_template = { + .owner = THIS_MODULE, + .gendrv = { + .name = "osst", + .probe = osst_probe, + .remove = osst_remove, + } +}; + +static int osst_int_ioctl(struct osst_tape *STp, struct scsi_request ** aSRpnt, + unsigned int cmd_in, unsigned long arg); + +static int osst_set_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt, int frame, int skip); + +static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt); + +static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request ** aSRpnt); + +static int osst_write_error_recovery(struct osst_tape * STp, struct scsi_request ** aSRpnt, int pending); + +static inline char *tape_name(struct osst_tape *tape) +{ + return tape->drive->disk_name; +} + +/* Routines that handle the interaction with mid-layer SCSI routines */ + +/* Convert the result to success code */ +static int osst_chk_result(struct osst_tape * STp, struct scsi_request * SRpnt) +{ + char *name = tape_name(STp); + int result = SRpnt->sr_result; + unsigned char * sense = SRpnt->sr_sense_buffer, scode; +#if DEBUG + const char *stp; +#endif + + if (!result) { + sense[0] = 0; /* We don't have sense data if this byte is zero */ + return 0; + } + if ((driver_byte(result) & DRIVER_MASK) == 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(OSST_DEB_MSG "%s:D: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n", + name, result, + SRpnt->sr_cmnd[0], SRpnt->sr_cmnd[1], SRpnt->sr_cmnd[2], + SRpnt->sr_cmnd[3], SRpnt->sr_cmnd[4], SRpnt->sr_cmnd[5], + SRpnt->sr_bufflen); + if (scode) printk(OSST_DEB_MSG "%s:D: Sense: %02x, ASC: %02x, ASCQ: %02x\n", + name, scode, sense[12], sense[13]); + if (driver_byte(result) & DRIVER_SENSE) + scsi_print_req_sense("osst ", SRpnt); + } + 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 && + SRpnt->sr_cmnd[0] != MODE_SENSE && + SRpnt->sr_cmnd[0] != TEST_UNIT_READY)) { /* Abnormal conditions for tape */ + if (driver_byte(result) & DRIVER_SENSE) { + printk(KERN_WARNING "%s:W: Command with sense data:\n", name); + scsi_print_req_sense("osst:", SRpnt); + } + else { + static int notyetprinted = 1; + + printk(KERN_WARNING + "%s:W: Warning %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n", + name, result, suggestion(result), driver_byte(result) & DRIVER_MASK, + host_byte(result)); + if (notyetprinted) { + notyetprinted = 0; + printk(KERN_INFO + "%s:I: This warning may be caused by your scsi controller,\n", name); + printk(KERN_INFO + "%s:I: it has been reported with some Buslogic cards.\n", name); + } + } + } + STp->pos_unknown |= STp->device->was_reset; + + if ((sense[0] & 0x70) == 0x70 && + scode == RECOVERED_ERROR) { + STp->recover_count++; + STp->recover_erreg++; +#if DEBUG + if (debugging) { + if (SRpnt->sr_cmnd[0] == READ_6) + stp = "read"; + else if (SRpnt->sr_cmnd[0] == WRITE_6) + stp = "write"; + else + stp = "ioctl"; + printk(OSST_DEB_MSG "%s:D: Recovered %s error (%d).\n", name, stp, + STp->recover_count); + } +#endif + if ((sense[2] & 0xe0) == 0) + return 0; + } + return (-EIO); +} + + +/* Wakeup from interrupt */ +static void osst_sleep_done (struct scsi_cmnd * SCpnt) +{ + struct osst_tape * STp = container_of(SCpnt->request->rq_disk->private_data, struct osst_tape, driver); + + 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[2] & 0x0f) == VOLUME_OVERFLOW) + STp->buffer->midlevel_result = SCpnt->result; /* Error */ + else + STp->buffer->midlevel_result = INT_MAX; /* OK */ + } + else + STp->buffer->midlevel_result = SCpnt->result; + SCpnt->request->rq_status = RQ_SCSI_DONE; + STp->buffer->last_SRpnt = SCpnt->sc_request; + +#if DEBUG + STp->write_pending = 0; +#endif + complete(SCpnt->request->waiting); +} + + +/* Do the scsi command. Waits until command performed if do_wait is true. + Otherwise osst_write_behind_check() is used to check that the command + has finished. */ +static struct scsi_request * osst_do_scsi(struct scsi_request *SRpnt, struct osst_tape *STp, + unsigned char *cmd, int bytes, int direction, int timeout, int retries, int do_wait) +{ + unsigned char *bp; +#ifdef OSST_INJECT_ERRORS + static int inject = 0; + static int repeat = 0; +#endif + if (SRpnt == NULL) { + if ((SRpnt = scsi_allocate_request(STp->device, GFP_ATOMIC)) == NULL) { + printk(KERN_ERR "%s:E: Can't get SCSI request.\n", tape_name(STp)); + if (signal_pending(current)) + (STp->buffer)->syscall_result = (-EINTR); + else + (STp->buffer)->syscall_result = (-EBUSY); + return NULL; + } + } + + init_completion(&STp->wait); + SRpnt->sr_use_sg = (bytes > (STp->buffer)->sg[0].length) ? + (STp->buffer)->use_sg : 0; + if (SRpnt->sr_use_sg) { + bp = (char *)&(STp->buffer->sg[0]); + if (STp->buffer->sg_segs < SRpnt->sr_use_sg) + SRpnt->sr_use_sg = STp->buffer->sg_segs; + } + else + bp = (STp->buffer)->b_data; + SRpnt->sr_data_direction = direction; + SRpnt->sr_cmd_len = 0; + SRpnt->sr_request->waiting = &(STp->wait); + SRpnt->sr_request->rq_status = RQ_SCSI_BUSY; + SRpnt->sr_request->rq_disk = STp->drive; + + scsi_do_req(SRpnt, (void *)cmd, bp, bytes, osst_sleep_done, timeout, retries); + + if (do_wait) { + wait_for_completion(SRpnt->sr_request->waiting); + SRpnt->sr_request->waiting = NULL; + STp->buffer->syscall_result = osst_chk_result(STp, SRpnt); +#ifdef OSST_INJECT_ERRORS + if (STp->buffer->syscall_result == 0 && + cmd[0] == READ_6 && + cmd[4] && + ( (++ inject % 83) == 29 || + (STp->first_frame_position == 240 + /* or STp->read_error_frame to fail again on the block calculated above */ && + ++repeat < 3))) { + printk(OSST_DEB_MSG "%s:D: Injecting read error\n", tape_name(STp)); + STp->buffer->last_result_fatal = 1; + } +#endif + } + return SRpnt; +} + + +/* Handle the write-behind checking (downs the semaphore) */ +static void osst_write_behind_check(struct osst_tape *STp) +{ + struct osst_buffer * STbuffer; + + STbuffer = STp->buffer; + +#if DEBUG + if (STp->write_pending) + STp->nbr_waits++; + else + STp->nbr_finished++; +#endif + wait_for_completion(&(STp->wait)); + (STp->buffer)->last_SRpnt->sr_request->waiting = NULL; + + STp->buffer->syscall_result = osst_chk_result(STp, STp->buffer->last_SRpnt); + + if ((STp->buffer)->syscall_result) + (STp->buffer)->syscall_result = + osst_write_error_recovery(STp, &((STp->buffer)->last_SRpnt), 1); + else + STp->first_frame_position++; + + scsi_release_request((STp->buffer)->last_SRpnt); + + if (STbuffer->writing < STbuffer->buffer_bytes) + printk(KERN_WARNING "osst :A: write_behind_check: something left in buffer!\n"); + + STbuffer->buffer_bytes -= STbuffer->writing; + STbuffer->writing = 0; + + return; +} + + + +/* Onstream specific Routines */ +/* + * Initialize the OnStream AUX + */ +static void osst_init_aux(struct osst_tape * STp, int frame_type, int frame_seq_number, + int logical_blk_num, int blk_sz, int blk_cnt) +{ + os_aux_t *aux = STp->buffer->aux; + os_partition_t *par = &aux->partition; + os_dat_t *dat = &aux->dat; + + if (STp->raw) return; + + memset(aux, 0, sizeof(*aux)); + aux->format_id = htonl(0); + memcpy(aux->application_sig, "LIN4", 4); + aux->hdwr = htonl(0); + aux->frame_type = frame_type; + + switch (frame_type) { + case OS_FRAME_TYPE_HEADER: + aux->update_frame_cntr = htonl(STp->update_frame_cntr); + par->partition_num = OS_CONFIG_PARTITION; + par->par_desc_ver = OS_PARTITION_VERSION; + par->wrt_pass_cntr = htons(0xffff); + /* 0-4 = reserved, 5-9 = header, 2990-2994 = header, 2995-2999 = reserved */ + par->first_frame_ppos = htonl(0); + par->last_frame_ppos = htonl(0xbb7); + aux->frame_seq_num = htonl(0); + aux->logical_blk_num_high = htonl(0); + aux->logical_blk_num = htonl(0); + aux->next_mark_ppos = htonl(STp->first_mark_ppos); + break; + case OS_FRAME_TYPE_DATA: + case OS_FRAME_TYPE_MARKER: + dat->dat_sz = 8; + dat->reserved1 = 0; + dat->entry_cnt = 1; + dat->reserved3 = 0; + dat->dat_list[0].blk_sz = htonl(blk_sz); + dat->dat_list[0].blk_cnt = htons(blk_cnt); + dat->dat_list[0].flags = frame_type==OS_FRAME_TYPE_MARKER? + OS_DAT_FLAGS_MARK:OS_DAT_FLAGS_DATA; + dat->dat_list[0].reserved = 0; + case OS_FRAME_TYPE_EOD: + aux->update_frame_cntr = htonl(0); + par->partition_num = OS_DATA_PARTITION; + par->par_desc_ver = OS_PARTITION_VERSION; + par->wrt_pass_cntr = htons(STp->wrt_pass_cntr); + par->first_frame_ppos = htonl(STp->first_data_ppos); + par->last_frame_ppos = htonl(STp->capacity); + aux->frame_seq_num = htonl(frame_seq_number); + aux->logical_blk_num_high = htonl(0); + aux->logical_blk_num = htonl(logical_blk_num); + break; + default: ; /* probably FILL */ + } + aux->filemark_cnt = ntohl(STp->filemark_cnt); + aux->phys_fm = ntohl(0xffffffff); + aux->last_mark_ppos = ntohl(STp->last_mark_ppos); + aux->last_mark_lbn = ntohl(STp->last_mark_lbn); +} + +/* + * Verify that we have the correct tape frame + */ +static int osst_verify_frame(struct osst_tape * STp, int frame_seq_number, int quiet) +{ + char * name = tape_name(STp); + os_aux_t * aux = STp->buffer->aux; + os_partition_t * par = &(aux->partition); + struct st_partstat * STps = &(STp->ps[STp->partition]); + int blk_cnt, blk_sz, i; + + if (STp->raw) { + if (STp->buffer->syscall_result) { + for (i=0; i < STp->buffer->sg_segs; i++) + memset(page_address(STp->buffer->sg[i].page), + 0, STp->buffer->sg[i].length); + strcpy(STp->buffer->b_data, "READ ERROR ON FRAME"); + } else + STp->buffer->buffer_bytes = OS_FRAME_SIZE; + return 1; + } + if (STp->buffer->syscall_result) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, read error\n", name); +#endif + return 0; + } + if (ntohl(aux->format_id) != 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, format_id %u\n", name, ntohl(aux->format_id)); +#endif + goto err_out; + } + if (memcmp(aux->application_sig, STp->application_sig, 4) != 0 && + (memcmp(aux->application_sig, "LIN3", 4) != 0 || STp->linux_media_version != 4)) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, incorrect application signature\n", name); +#endif + goto err_out; + } + if (par->partition_num != OS_DATA_PARTITION) { + if (!STp->linux_media || STp->linux_media_version != 2) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, partition num %d\n", + name, par->partition_num); +#endif + goto err_out; + } + } + if (par->par_desc_ver != OS_PARTITION_VERSION) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, partition version %d\n", name, par->par_desc_ver); +#endif + goto err_out; + } + if (ntohs(par->wrt_pass_cntr) != STp->wrt_pass_cntr) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, wrt_pass_cntr %d (expected %d)\n", + name, ntohs(par->wrt_pass_cntr), STp->wrt_pass_cntr); +#endif + goto err_out; + } + if (aux->frame_type != OS_FRAME_TYPE_DATA && + aux->frame_type != OS_FRAME_TYPE_EOD && + aux->frame_type != OS_FRAME_TYPE_MARKER) { + if (!quiet) +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, frame type %x\n", name, aux->frame_type); +#endif + goto err_out; + } + if (aux->frame_type == OS_FRAME_TYPE_EOD && + STp->first_frame_position < STp->eod_frame_ppos) { + printk(KERN_INFO "%s:I: Skipping premature EOD frame %d\n", name, + STp->first_frame_position); + goto err_out; + } + if (frame_seq_number != -1 && ntohl(aux->frame_seq_num) != frame_seq_number) { + if (!quiet) +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame, sequence number %u (expected %d)\n", + name, ntohl(aux->frame_seq_num), frame_seq_number); +#endif + goto err_out; + } + if (aux->frame_type == OS_FRAME_TYPE_MARKER) { + STps->eof = ST_FM_HIT; + + i = ntohl(aux->filemark_cnt); + if (STp->header_cache != NULL && i < OS_FM_TAB_MAX && (i > STp->filemark_cnt || + STp->first_frame_position - 1 != ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[i]))) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: %s filemark %d at frame pos %d\n", name, + STp->header_cache->dat_fm_tab.fm_tab_ent[i] == 0?"Learned":"Corrected", + i, STp->first_frame_position - 1); +#endif + STp->header_cache->dat_fm_tab.fm_tab_ent[i] = htonl(STp->first_frame_position - 1); + if (i >= STp->filemark_cnt) + STp->filemark_cnt = i+1; + } + } + if (aux->frame_type == OS_FRAME_TYPE_EOD) { + STps->eof = ST_EOD_1; + STp->frame_in_buffer = 1; + } + if (aux->frame_type == OS_FRAME_TYPE_DATA) { + blk_cnt = ntohs(aux->dat.dat_list[0].blk_cnt); + blk_sz = ntohl(aux->dat.dat_list[0].blk_sz); + STp->buffer->buffer_bytes = blk_cnt * blk_sz; + STp->buffer->read_pointer = 0; + STp->frame_in_buffer = 1; + + /* See what block size was used to write file */ + if (STp->block_size != blk_sz && blk_sz > 0) { + printk(KERN_INFO + "%s:I: File was written with block size %d%c, currently %d%c, adjusted to match.\n", + name, blk_sz<1024?blk_sz:blk_sz/1024,blk_sz<1024?'b':'k', + STp->block_size<1024?STp->block_size:STp->block_size/1024, + STp->block_size<1024?'b':'k'); + STp->block_size = blk_sz; + STp->buffer->buffer_blocks = OS_DATA_SIZE / blk_sz; + } + STps->eof = ST_NOEOF; + } + STp->frame_seq_number = ntohl(aux->frame_seq_num); + STp->logical_blk_num = ntohl(aux->logical_blk_num); + return 1; + +err_out: + if (STp->read_error_frame == 0) + STp->read_error_frame = STp->first_frame_position - 1; + return 0; +} + +/* + * Wait for the unit to become Ready + */ +static int osst_wait_ready(struct osst_tape * STp, struct scsi_request ** aSRpnt, + unsigned timeout, int initial_delay) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + unsigned long startwait = jiffies; +#if DEBUG + int dbg = debugging; + char * name = tape_name(STp); + + printk(OSST_DEB_MSG "%s:D: Reached onstream wait ready\n", name); +#endif + + if (initial_delay > 0) + msleep(jiffies_to_msecs(initial_delay)); + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + if (!SRpnt) return (-EBUSY); + + while ( STp->buffer->syscall_result && time_before(jiffies, startwait + timeout*HZ) && + (( SRpnt->sr_sense_buffer[2] == 2 && SRpnt->sr_sense_buffer[12] == 4 && + (SRpnt->sr_sense_buffer[13] == 1 || SRpnt->sr_sense_buffer[13] == 8) ) || + ( SRpnt->sr_sense_buffer[2] == 6 && SRpnt->sr_sense_buffer[12] == 0x28 && + SRpnt->sr_sense_buffer[13] == 0 ) )) { +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG "%s:D: Sleeping in onstream wait ready\n", name); + printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name); + debugging = 0; + } +#endif + msleep(100); + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + } + *aSRpnt = SRpnt; +#if DEBUG + debugging = dbg; +#endif + if ( STp->buffer->syscall_result && + osst_write_error_recovery(STp, aSRpnt, 0) ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Abnormal exit from onstream wait ready\n", name); + printk(OSST_DEB_MSG "%s:D: Result = %d, Sense: 0=%02x, 2=%02x, 12=%02x, 13=%02x\n", name, + STp->buffer->syscall_result, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2], + SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]); +#endif + return (-EIO); + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Normal exit from onstream wait ready\n", name); +#endif + return 0; +} + +/* + * Wait for a tape to be inserted in the unit + */ +static int osst_wait_for_medium(struct osst_tape * STp, struct scsi_request ** aSRpnt, unsigned timeout) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + unsigned long startwait = jiffies; +#if DEBUG + int dbg = debugging; + char * name = tape_name(STp); + + printk(OSST_DEB_MSG "%s:D: Reached onstream wait for medium\n", name); +#endif + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + if (!SRpnt) return (-EBUSY); + + while ( STp->buffer->syscall_result && time_before(jiffies, startwait + timeout*HZ) && + SRpnt->sr_sense_buffer[2] == 2 && SRpnt->sr_sense_buffer[12] == 0x3a && + SRpnt->sr_sense_buffer[13] == 0 ) { +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG "%s:D: Sleeping in onstream wait medium\n", name); + printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name); + debugging = 0; + } +#endif + msleep(100); + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + } + *aSRpnt = SRpnt; +#if DEBUG + debugging = dbg; +#endif + if ( STp->buffer->syscall_result && SRpnt->sr_sense_buffer[2] != 2 && + SRpnt->sr_sense_buffer[12] != 4 && SRpnt->sr_sense_buffer[13] == 1) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Abnormal exit from onstream wait medium\n", name); + printk(OSST_DEB_MSG "%s:D: Result = %d, Sense: 0=%02x, 2=%02x, 12=%02x, 13=%02x\n", name, + STp->buffer->syscall_result, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2], + SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]); +#endif + return 0; + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Normal exit from onstream wait medium\n", name); +#endif + return 1; +} + +static int osst_position_tape_and_confirm(struct osst_tape * STp, struct scsi_request ** aSRpnt, int frame) +{ + int retval; + + osst_wait_ready(STp, aSRpnt, 15 * 60, 0); /* TODO - can this catch a write error? */ + retval = osst_set_frame_position(STp, aSRpnt, frame, 0); + if (retval) return (retval); + osst_wait_ready(STp, aSRpnt, 15 * 60, OSST_WAIT_POSITION_COMPLETE); + return (osst_get_frame_position(STp, aSRpnt)); +} + +/* + * Wait for write(s) to complete + */ +static int osst_flush_drive_buffer(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + int result = 0; + int delay = OSST_WAIT_WRITE_COMPLETE; +#if DEBUG + char * name = tape_name(STp); + + printk(OSST_DEB_MSG "%s:D: Reached onstream flush drive buffer (write filemark)\n", name); +#endif + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_FILEMARKS; + cmd[1] = 1; + + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + if (!SRpnt) return (-EBUSY); + if (STp->buffer->syscall_result) { + if ((SRpnt->sr_sense_buffer[2] & 0x0f) == 2 && SRpnt->sr_sense_buffer[12] == 4) { + if (SRpnt->sr_sense_buffer[13] == 8) { + delay = OSST_WAIT_LONG_WRITE_COMPLETE; + } + } else + result = osst_write_error_recovery(STp, aSRpnt, 0); + } + result |= osst_wait_ready(STp, aSRpnt, 5 * 60, delay); + STp->ps[STp->partition].rw = OS_WRITING_COMPLETE; + + return (result); +} + +#define OSST_POLL_PER_SEC 10 +static int osst_wait_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int curr, int minlast, int to) +{ + unsigned long startwait = jiffies; + char * name = tape_name(STp); +#if DEBUG + char notyetprinted = 1; +#endif + if (minlast >= 0 && STp->ps[STp->partition].rw != ST_READING) + printk(KERN_ERR "%s:A: Waiting for frame without having initialized read!\n", name); + + while (time_before (jiffies, startwait + to*HZ)) + { + int result; + result = osst_get_frame_position(STp, aSRpnt); + if (result == -EIO) + if ((result = osst_write_error_recovery(STp, aSRpnt, 0)) == 0) + return 0; /* successful recovery leaves drive ready for frame */ + if (result < 0) break; + if (STp->first_frame_position == curr && + ((minlast < 0 && + (signed)STp->last_frame_position > (signed)curr + minlast) || + (minlast >= 0 && STp->cur_frames > minlast) + ) && result >= 0) + { +#if DEBUG + if (debugging || jiffies - startwait >= 2*HZ/OSST_POLL_PER_SEC) + printk (OSST_DEB_MSG + "%s:D: Succ wait f fr %i (>%i): %i-%i %i (%i): %3li.%li s\n", + name, curr, curr+minlast, STp->first_frame_position, + STp->last_frame_position, STp->cur_frames, + result, (jiffies-startwait)/HZ, + (((jiffies-startwait)%HZ)*10)/HZ); +#endif + return 0; + } +#if DEBUG + if (jiffies - startwait >= 2*HZ/OSST_POLL_PER_SEC && notyetprinted) + { + printk (OSST_DEB_MSG "%s:D: Wait for frame %i (>%i): %i-%i %i (%i)\n", + name, curr, curr+minlast, STp->first_frame_position, + STp->last_frame_position, STp->cur_frames, result); + notyetprinted--; + } +#endif + msleep(1000 / OSST_POLL_PER_SEC); + } +#if DEBUG + printk (OSST_DEB_MSG "%s:D: Fail wait f fr %i (>%i): %i-%i %i: %3li.%li s\n", + name, curr, curr+minlast, STp->first_frame_position, + STp->last_frame_position, STp->cur_frames, + (jiffies-startwait)/HZ, (((jiffies-startwait)%HZ)*10)/HZ); +#endif + return -EBUSY; +} + +static int osst_recover_wait_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int writing) +{ + struct scsi_request * SRpnt; + unsigned char cmd[MAX_COMMAND_SIZE]; + unsigned long startwait = jiffies; + int retval = 1; + char * name = tape_name(STp); + + if (writing) { + char mybuf[24]; + char * olddata = STp->buffer->b_data; + int oldsize = STp->buffer->buffer_size; + + /* write zero fm then read pos - if shows write error, try to recover - if no progress, wait */ + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_FILEMARKS; + cmd[1] = 1; + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, + MAX_RETRIES, 1); + + while (retval && time_before (jiffies, startwait + 5*60*HZ)) { + + if (STp->buffer->syscall_result && (SRpnt->sr_sense_buffer[2] & 0x0f) != 2) { + + /* some failure - not just not-ready */ + retval = osst_write_error_recovery(STp, aSRpnt, 0); + break; + } + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout (HZ / OSST_POLL_PER_SEC); + + STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24; + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = READ_POSITION; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 20, DMA_FROM_DEVICE, STp->timeout, + MAX_RETRIES, 1); + + retval = ( STp->buffer->syscall_result || (STp->buffer)->b_data[15] > 25 ); + STp->buffer->b_data = olddata; STp->buffer->buffer_size = oldsize; + } + if (retval) + printk(KERN_ERR "%s:E: Device did not succeed to write buffered data\n", name); + } else + /* TODO - figure out which error conditions can be handled */ + if (STp->buffer->syscall_result) + printk(KERN_WARNING + "%s:W: Recover_wait_frame(read) cannot handle %02x:%02x:%02x\n", name, + (*aSRpnt)->sr_sense_buffer[ 2] & 0x0f, + (*aSRpnt)->sr_sense_buffer[12], + (*aSRpnt)->sr_sense_buffer[13]); + + return retval; +} + +/* + * Read the next OnStream tape frame at the current location + */ +static int osst_read_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int timeout) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + int retval = 0; +#if DEBUG + os_aux_t * aux = STp->buffer->aux; + char * name = tape_name(STp); +#endif + + if (STp->poll) + if (osst_wait_frame (STp, aSRpnt, STp->first_frame_position, 0, timeout)) + retval = osst_recover_wait_frame(STp, aSRpnt, 0); + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = READ_6; + cmd[1] = 1; + cmd[4] = 1; + +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Reading frame from OnStream tape\n", name); +#endif + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, DMA_FROM_DEVICE, + STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + if (!SRpnt) + return (-EBUSY); + + if ((STp->buffer)->syscall_result) { + retval = 1; + if (STp->read_error_frame == 0) { + STp->read_error_frame = STp->first_frame_position; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Recording read error at %d\n", name, STp->read_error_frame); +#endif + } +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", + name, + SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[1], + SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[3], + SRpnt->sr_sense_buffer[4], SRpnt->sr_sense_buffer[5], + SRpnt->sr_sense_buffer[6], SRpnt->sr_sense_buffer[7]); +#endif + } + else + STp->first_frame_position++; +#if DEBUG + if (debugging) { + char sig[8]; int i; + for (i=0;i<4;i++) + sig[i] = aux->application_sig[i]<32?'^':aux->application_sig[i]; + sig[4] = '\0'; + printk(OSST_DEB_MSG + "%s:D: AUX: %s UpdFrCt#%d Wpass#%d %s FrSeq#%d LogBlk#%d Qty=%d Sz=%d\n", name, sig, + ntohl(aux->update_frame_cntr), ntohs(aux->partition.wrt_pass_cntr), + aux->frame_type==1?"EOD":aux->frame_type==2?"MARK": + aux->frame_type==8?"HEADR":aux->frame_type==0x80?"DATA":"FILL", + ntohl(aux->frame_seq_num), ntohl(aux->logical_blk_num), + ntohs(aux->dat.dat_list[0].blk_cnt), ntohl(aux->dat.dat_list[0].blk_sz) ); + if (aux->frame_type==2) + printk(OSST_DEB_MSG "%s:D: mark_cnt=%d, last_mark_ppos=%d, last_mark_lbn=%d\n", name, + ntohl(aux->filemark_cnt), ntohl(aux->last_mark_ppos), ntohl(aux->last_mark_lbn)); + printk(OSST_DEB_MSG "%s:D: Exit read frame from OnStream tape with code %d\n", name, retval); + } +#endif + return (retval); +} + +static int osst_initiate_read(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + struct st_partstat * STps = &(STp->ps[STp->partition]); + struct scsi_request * SRpnt ; + unsigned char cmd[MAX_COMMAND_SIZE]; + int retval = 0; + char * name = tape_name(STp); + + if (STps->rw != ST_READING) { /* Initialize read operation */ + if (STps->rw == ST_WRITING || STp->dirty) { + STp->write_type = OS_WRITE_DATA; + osst_flush_write_buffer(STp, aSRpnt); + osst_flush_drive_buffer(STp, aSRpnt); + } + STps->rw = ST_READING; + STp->frame_in_buffer = 0; + + /* + * Issue a read 0 command to get the OnStream drive + * read frames into its buffer. + */ + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = READ_6; + cmd[1] = 1; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Start Read Ahead on OnStream tape\n", name); +#endif + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + if ((retval = STp->buffer->syscall_result)) + printk(KERN_WARNING "%s:W: Error starting read ahead\n", name); + } + + return retval; +} + +static int osst_get_logical_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, + int frame_seq_number, int quiet) +{ + struct st_partstat * STps = &(STp->ps[STp->partition]); + char * name = tape_name(STp); + int cnt = 0, + bad = 0, + past = 0, + x, + position; + + /* + * If we want just any frame (-1) and there is a frame in the buffer, return it + */ + if (frame_seq_number == -1 && STp->frame_in_buffer) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Frame %d still in buffer\n", name, STp->frame_seq_number); +#endif + return (STps->eof); + } + /* + * Search and wait for the next logical tape frame + */ + while (1) { + if (cnt++ > 400) { + printk(KERN_ERR "%s:E: Couldn't find logical frame %d, aborting\n", + name, frame_seq_number); + if (STp->read_error_frame) { + osst_set_frame_position(STp, aSRpnt, STp->read_error_frame, 0); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Repositioning tape to bad frame %d\n", + name, STp->read_error_frame); +#endif + STp->read_error_frame = 0; + STp->abort_count++; + } + return (-EIO); + } +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Looking for frame %d, attempt %d\n", + name, frame_seq_number, cnt); +#endif + if ( osst_initiate_read(STp, aSRpnt) + || ( (!STp->frame_in_buffer) && osst_read_frame(STp, aSRpnt, 30) ) ) { + if (STp->raw) + return (-EIO); + position = osst_get_frame_position(STp, aSRpnt); + if (position >= 0xbae && position < 0xbb8) + position = 0xbb8; + else if (position > STp->eod_frame_ppos || ++bad == 10) { + position = STp->read_error_frame - 1; + bad = 0; + } + else { + position += 29; + cnt += 19; + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Bad frame detected, positioning tape to block %d\n", + name, position); +#endif + osst_set_frame_position(STp, aSRpnt, position, 0); + continue; + } + if (osst_verify_frame(STp, frame_seq_number, quiet)) + break; + if (osst_verify_frame(STp, -1, quiet)) { + x = ntohl(STp->buffer->aux->frame_seq_num); + if (STp->fast_open) { + printk(KERN_WARNING + "%s:W: Found logical frame %d instead of %d after fast open\n", + name, x, frame_seq_number); + STp->header_ok = 0; + STp->read_error_frame = 0; + return (-EIO); + } + if (x > frame_seq_number) { + if (++past > 3) { + /* positioning backwards did not bring us to the desired frame */ + position = STp->read_error_frame - 1; + } + else { + position = osst_get_frame_position(STp, aSRpnt) + + frame_seq_number - x - 1; + + if (STp->first_frame_position >= 3000 && position < 3000) + position -= 10; + } +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Found logical frame %d while looking for %d: back up %d\n", + name, x, frame_seq_number, + STp->first_frame_position - position); +#endif + osst_set_frame_position(STp, aSRpnt, position, 0); + cnt += 10; + } + else + past = 0; + } + if (osst_get_frame_position(STp, aSRpnt) == 0xbaf) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping config partition\n", name); +#endif + osst_set_frame_position(STp, aSRpnt, 0xbb8, 0); + cnt--; + } + STp->frame_in_buffer = 0; + } + if (cnt > 1) { + STp->recover_count++; + STp->recover_erreg++; + printk(KERN_WARNING "%s:I: Don't worry, Read error at position %d recovered\n", + name, STp->read_error_frame); + } + STp->read_count++; + +#if DEBUG + if (debugging || STps->eof) + printk(OSST_DEB_MSG + "%s:D: Exit get logical frame (%d=>%d) from OnStream tape with code %d\n", + name, frame_seq_number, STp->frame_seq_number, STps->eof); +#endif + STp->fast_open = 0; + STp->read_error_frame = 0; + return (STps->eof); +} + +static int osst_seek_logical_blk(struct osst_tape * STp, struct scsi_request ** aSRpnt, int logical_blk_num) +{ + struct st_partstat * STps = &(STp->ps[STp->partition]); + char * name = tape_name(STp); + int retries = 0; + int frame_seq_estimate, ppos_estimate, move; + + if (logical_blk_num < 0) logical_blk_num = 0; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Seeking logical block %d (now at %d, size %d%c)\n", + name, logical_blk_num, STp->logical_blk_num, + STp->block_size<1024?STp->block_size:STp->block_size/1024, + STp->block_size<1024?'b':'k'); +#endif + /* Do we know where we are? */ + if (STps->drv_block >= 0) { + move = logical_blk_num - STp->logical_blk_num; + if (move < 0) move -= (OS_DATA_SIZE / STp->block_size) - 1; + move /= (OS_DATA_SIZE / STp->block_size); + frame_seq_estimate = STp->frame_seq_number + move; + } else + frame_seq_estimate = logical_blk_num * STp->block_size / OS_DATA_SIZE; + + if (frame_seq_estimate < 2980) ppos_estimate = frame_seq_estimate + 10; + else ppos_estimate = frame_seq_estimate + 20; + while (++retries < 10) { + if (ppos_estimate > STp->eod_frame_ppos-2) { + frame_seq_estimate += STp->eod_frame_ppos - 2 - ppos_estimate; + ppos_estimate = STp->eod_frame_ppos - 2; + } + if (frame_seq_estimate < 0) { + frame_seq_estimate = 0; + ppos_estimate = 10; + } + osst_set_frame_position(STp, aSRpnt, ppos_estimate, 0); + if (osst_get_logical_frame(STp, aSRpnt, frame_seq_estimate, 1) >= 0) { + /* we've located the estimated frame, now does it have our block? */ + if (logical_blk_num < STp->logical_blk_num || + logical_blk_num >= STp->logical_blk_num + ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt)) { + if (STps->eof == ST_FM_HIT) + move = logical_blk_num < STp->logical_blk_num? -2 : 1; + else { + move = logical_blk_num - STp->logical_blk_num; + if (move < 0) move -= (OS_DATA_SIZE / STp->block_size) - 1; + move /= (OS_DATA_SIZE / STp->block_size); + } + if (!move) move = logical_blk_num > STp->logical_blk_num ? 1 : -1; +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Seek retry %d at ppos %d fsq %d (est %d) lbn %d (need %d) move %d\n", + name, retries, ppos_estimate, STp->frame_seq_number, frame_seq_estimate, + STp->logical_blk_num, logical_blk_num, move); +#endif + frame_seq_estimate += move; + ppos_estimate += move; + continue; + } else { + STp->buffer->read_pointer = (logical_blk_num - STp->logical_blk_num) * STp->block_size; + STp->buffer->buffer_bytes -= STp->buffer->read_pointer; + STp->logical_blk_num = logical_blk_num; +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Seek success at ppos %d fsq %d in_buf %d, bytes %d, ptr %d*%d\n", + name, ppos_estimate, STp->frame_seq_number, STp->frame_in_buffer, + STp->buffer->buffer_bytes, STp->buffer->read_pointer / STp->block_size, + STp->block_size); +#endif + STps->drv_file = ntohl(STp->buffer->aux->filemark_cnt); + if (STps->eof == ST_FM_HIT) { + STps->drv_file++; + STps->drv_block = 0; + } else { + STps->drv_block = ntohl(STp->buffer->aux->last_mark_lbn)? + STp->logical_blk_num - + (STps->drv_file ? ntohl(STp->buffer->aux->last_mark_lbn) + 1 : 0): + -1; + } + STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD:ST_NOEOF; + return 0; + } + } + if (osst_get_logical_frame(STp, aSRpnt, -1, 1) < 0) + goto error; + /* we are not yet at the estimated frame, adjust our estimate of its physical position */ +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Seek retry %d at ppos %d fsq %d (est %d) lbn %d (need %d)\n", + name, retries, ppos_estimate, STp->frame_seq_number, frame_seq_estimate, + STp->logical_blk_num, logical_blk_num); +#endif + if (frame_seq_estimate != STp->frame_seq_number) + ppos_estimate += frame_seq_estimate - STp->frame_seq_number; + else + break; + } +error: + printk(KERN_ERR "%s:E: Couldn't seek to logical block %d (at %d), %d retries\n", + name, logical_blk_num, STp->logical_blk_num, retries); + return (-EIO); +} + +/* The values below are based on the OnStream frame payload size of 32K == 2**15, + * that is, OSST_FRAME_SHIFT + OSST_SECTOR_SHIFT must be 15. With a minimum block + * size of 512 bytes, we need to be able to resolve 32K/512 == 64 == 2**6 positions + * inside each frame. Finaly, OSST_SECTOR_MASK == 2**OSST_FRAME_SHIFT - 1. + */ +#define OSST_FRAME_SHIFT 6 +#define OSST_SECTOR_SHIFT 9 +#define OSST_SECTOR_MASK 0x03F + +static int osst_get_sector(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + int sector; +#if DEBUG + char * name = tape_name(STp); + + printk(OSST_DEB_MSG + "%s:D: Positioned at ppos %d, frame %d, lbn %d, file %d, blk %d, %cptr %d, eof %d\n", + name, STp->first_frame_position, STp->frame_seq_number, STp->logical_blk_num, + STp->ps[STp->partition].drv_file, STp->ps[STp->partition].drv_block, + STp->ps[STp->partition].rw == ST_WRITING?'w':'r', + STp->ps[STp->partition].rw == ST_WRITING?STp->buffer->buffer_bytes: + STp->buffer->read_pointer, STp->ps[STp->partition].eof); +#endif + /* do we know where we are inside a file? */ + if (STp->ps[STp->partition].drv_block >= 0) { + sector = (STp->frame_in_buffer ? STp->first_frame_position-1 : + STp->first_frame_position) << OSST_FRAME_SHIFT; + if (STp->ps[STp->partition].rw == ST_WRITING) + sector |= (STp->buffer->buffer_bytes >> OSST_SECTOR_SHIFT) & OSST_SECTOR_MASK; + else + sector |= (STp->buffer->read_pointer >> OSST_SECTOR_SHIFT) & OSST_SECTOR_MASK; + } else { + sector = osst_get_frame_position(STp, aSRpnt); + if (sector > 0) + sector <<= OSST_FRAME_SHIFT; + } + return sector; +} + +static int osst_seek_sector(struct osst_tape * STp, struct scsi_request ** aSRpnt, int sector) +{ + struct st_partstat * STps = &(STp->ps[STp->partition]); + int frame = sector >> OSST_FRAME_SHIFT, + offset = (sector & OSST_SECTOR_MASK) << OSST_SECTOR_SHIFT, + r; +#if DEBUG + char * name = tape_name(STp); + + printk(OSST_DEB_MSG "%s:D: Seeking sector %d in frame %d at offset %d\n", + name, sector, frame, offset); +#endif + if (frame < 0 || frame >= STp->capacity) return (-ENXIO); + + if (frame <= STp->first_data_ppos) { + STp->frame_seq_number = STp->logical_blk_num = STps->drv_file = STps->drv_block = 0; + return (osst_set_frame_position(STp, aSRpnt, frame, 0)); + } + r = osst_set_frame_position(STp, aSRpnt, offset?frame:frame-1, 0); + if (r < 0) return r; + + r = osst_get_logical_frame(STp, aSRpnt, -1, 1); + if (r < 0) return r; + + if (osst_get_frame_position(STp, aSRpnt) != (offset?frame+1:frame)) return (-EIO); + + if (offset) { + STp->logical_blk_num += offset / STp->block_size; + STp->buffer->read_pointer = offset; + STp->buffer->buffer_bytes -= offset; + } else { + STp->frame_seq_number++; + STp->frame_in_buffer = 0; + STp->logical_blk_num += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt); + STp->buffer->buffer_bytes = STp->buffer->read_pointer = 0; + } + STps->drv_file = ntohl(STp->buffer->aux->filemark_cnt); + if (STps->eof == ST_FM_HIT) { + STps->drv_file++; + STps->drv_block = 0; + } else { + STps->drv_block = ntohl(STp->buffer->aux->last_mark_lbn)? + STp->logical_blk_num - + (STps->drv_file ? ntohl(STp->buffer->aux->last_mark_lbn) + 1 : 0): + -1; + } + STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD:ST_NOEOF; +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Now positioned at ppos %d, frame %d, lbn %d, file %d, blk %d, rptr %d, eof %d\n", + name, STp->first_frame_position, STp->frame_seq_number, STp->logical_blk_num, + STps->drv_file, STps->drv_block, STp->buffer->read_pointer, STps->eof); +#endif + return 0; +} + +/* + * Read back the drive's internal buffer contents, as a part + * of the write error recovery mechanism for old OnStream + * firmware revisions. + * Precondition for this function to work: all frames in the + * drive's buffer must be of one type (DATA, MARK or EOD)! + */ +static int osst_read_back_buffer_and_rewrite(struct osst_tape * STp, struct scsi_request ** aSRpnt, + unsigned int frame, unsigned int skip, int pending) +{ + struct scsi_request * SRpnt = * aSRpnt; + unsigned char * buffer, * p; + unsigned char cmd[MAX_COMMAND_SIZE]; + int flag, new_frame, i; + int nframes = STp->cur_frames; + int blks_per_frame = ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt); + int frame_seq_number = ntohl(STp->buffer->aux->frame_seq_num) + - (nframes + pending - 1); + int logical_blk_num = ntohl(STp->buffer->aux->logical_blk_num) + - (nframes + pending - 1) * blks_per_frame; + char * name = tape_name(STp); + unsigned long startwait = jiffies; +#if DEBUG + int dbg = debugging; +#endif + + if ((buffer = (unsigned char *)vmalloc((nframes + 1) * OS_DATA_SIZE)) == NULL) + return (-EIO); + + printk(KERN_INFO "%s:I: Reading back %d frames from drive buffer%s\n", + name, nframes, pending?" and one that was pending":""); + + osst_copy_from_buffer(STp->buffer, (p = &buffer[nframes * OS_DATA_SIZE])); +#if DEBUG + if (pending && debugging) + printk(OSST_DEB_MSG "%s:D: Pending frame %d (lblk %d), data %02x %02x %02x %02x\n", + name, frame_seq_number + nframes, + logical_blk_num + nframes * blks_per_frame, + p[0], p[1], p[2], p[3]); +#endif + for (i = 0, p = buffer; i < nframes; i++, p += OS_DATA_SIZE) { + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = 0x3C; /* Buffer Read */ + cmd[1] = 6; /* Retrieve Faulty Block */ + cmd[7] = 32768 >> 8; + cmd[8] = 32768 & 0xff; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, OS_FRAME_SIZE, DMA_FROM_DEVICE, + STp->timeout, MAX_RETRIES, 1); + + if ((STp->buffer)->syscall_result || !SRpnt) { + printk(KERN_ERR "%s:E: Failed to read frame back from OnStream buffer\n", name); + vfree((void *)buffer); + *aSRpnt = SRpnt; + return (-EIO); + } + osst_copy_from_buffer(STp->buffer, p); +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Read back logical frame %d, data %02x %02x %02x %02x\n", + name, frame_seq_number + i, p[0], p[1], p[2], p[3]); +#endif + } + *aSRpnt = SRpnt; + osst_get_frame_position(STp, aSRpnt); + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Frames left in buffer: %d\n", name, STp->cur_frames); +#endif + /* Write synchronously so we can be sure we're OK again and don't have to recover recursively */ + /* In the header we don't actually re-write the frames that fail, just the ones after them */ + + for (flag=1, new_frame=frame, p=buffer, i=0; i < nframes + pending; ) { + + if (flag) { + if (STp->write_type == OS_WRITE_HEADER) { + i += skip; + p += skip * OS_DATA_SIZE; + } + else if (new_frame < 2990 && new_frame+skip+nframes+pending >= 2990) + new_frame = 3000-i; + else + new_frame += skip; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Position to frame %d, write fseq %d\n", + name, new_frame+i, frame_seq_number+i); +#endif + osst_set_frame_position(STp, aSRpnt, new_frame + i, 0); + osst_wait_ready(STp, aSRpnt, 60, OSST_WAIT_POSITION_COMPLETE); + osst_get_frame_position(STp, aSRpnt); + SRpnt = * aSRpnt; + + if (new_frame > frame + 1000) { + printk(KERN_ERR "%s:E: Failed to find writable tape media\n", name); + vfree((void *)buffer); + return (-EIO); + } + if ( i >= nframes + pending ) break; + flag = 0; + } + osst_copy_to_buffer(STp->buffer, p); + /* + * IMPORTANT: for error recovery to work, _never_ queue frames with mixed frame type! + */ + osst_init_aux(STp, STp->buffer->aux->frame_type, frame_seq_number+i, + logical_blk_num + i*blks_per_frame, + ntohl(STp->buffer->aux->dat.dat_list[0].blk_sz), blks_per_frame); + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_6; + cmd[1] = 1; + cmd[4] = 1; + +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG + "%s:D: About to write frame %d, seq %d, lbn %d, data %02x %02x %02x %02x\n", + name, new_frame+i, frame_seq_number+i, logical_blk_num + i*blks_per_frame, + p[0], p[1], p[2], p[3]); +#endif + SRpnt = osst_do_scsi(SRpnt, STp, cmd, OS_FRAME_SIZE, DMA_TO_DEVICE, + STp->timeout, MAX_RETRIES, 1); + + if (STp->buffer->syscall_result) + flag = 1; + else { + p += OS_DATA_SIZE; i++; + + /* if we just sent the last frame, wait till all successfully written */ + if ( i == nframes + pending ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Check re-write successful\n", name); +#endif + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_FILEMARKS; + cmd[1] = 1; + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, + STp->timeout, MAX_RETRIES, 1); +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG "%s:D: Sleeping in re-write wait ready\n", name); + printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name); + debugging = 0; + } +#endif + flag = STp->buffer->syscall_result; + while ( !flag && time_before(jiffies, startwait + 60*HZ) ) { + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, STp->timeout, + MAX_RETRIES, 1); + + if (SRpnt->sr_sense_buffer[2] == 2 && SRpnt->sr_sense_buffer[12] == 4 && + (SRpnt->sr_sense_buffer[13] == 1 || SRpnt->sr_sense_buffer[13] == 8)) { + /* in the process of becoming ready */ + msleep(100); + continue; + } + if (STp->buffer->syscall_result) + flag = 1; + break; + } +#if DEBUG + debugging = dbg; + printk(OSST_DEB_MSG "%s:D: Wait re-write finished\n", name); +#endif + } + } + *aSRpnt = SRpnt; + if (flag) { + if ((SRpnt->sr_sense_buffer[ 2] & 0x0f) == 13 && + SRpnt->sr_sense_buffer[12] == 0 && + SRpnt->sr_sense_buffer[13] == 2) { + printk(KERN_ERR "%s:E: Volume overflow in write error recovery\n", name); + vfree((void *)buffer); + return (-EIO); /* hit end of tape = fail */ + } + i = ((SRpnt->sr_sense_buffer[3] << 24) | + (SRpnt->sr_sense_buffer[4] << 16) | + (SRpnt->sr_sense_buffer[5] << 8) | + SRpnt->sr_sense_buffer[6] ) - new_frame; + p = &buffer[i * OS_DATA_SIZE]; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Additional write error at %d\n", name, new_frame+i); +#endif + osst_get_frame_position(STp, aSRpnt); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: reported frame positions: host = %d, tape = %d, buffer = %d\n", + name, STp->first_frame_position, STp->last_frame_position, STp->cur_frames); +#endif + } + } + if (flag) { + /* error recovery did not successfully complete */ + printk(KERN_ERR "%s:D: Write error recovery failed in %s\n", name, + STp->write_type == OS_WRITE_HEADER?"header":"body"); + } + if (!pending) + osst_copy_to_buffer(STp->buffer, p); /* so buffer content == at entry in all cases */ + vfree((void *)buffer); + return 0; +} + +static int osst_reposition_and_retry(struct osst_tape * STp, struct scsi_request ** aSRpnt, + unsigned int frame, unsigned int skip, int pending) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + char * name = tape_name(STp); + int expected = 0; + int attempts = 1000 / skip; + int flag = 1; + unsigned long startwait = jiffies; +#if DEBUG + int dbg = debugging; +#endif + + while (attempts && time_before(jiffies, startwait + 60*HZ)) { + if (flag) { +#if DEBUG + debugging = dbg; +#endif + if (frame < 2990 && frame+skip+STp->cur_frames+pending >= 2990) + frame = 3000-skip; + expected = frame+skip+STp->cur_frames+pending; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Position to fppos %d, re-write from fseq %d\n", + name, frame+skip, STp->frame_seq_number-STp->cur_frames-pending); +#endif + osst_set_frame_position(STp, aSRpnt, frame + skip, 1); + flag = 0; + attempts--; + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(HZ / 10); + } + if (osst_get_frame_position(STp, aSRpnt) < 0) { /* additional write error */ +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Addl error, host %d, tape %d, buffer %d\n", + name, STp->first_frame_position, + STp->last_frame_position, STp->cur_frames); +#endif + frame = STp->last_frame_position; + flag = 1; + continue; + } + if (pending && STp->cur_frames < 50) { + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_6; + cmd[1] = 1; + cmd[4] = 1; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: About to write pending fseq %d at fppos %d\n", + name, STp->frame_seq_number-1, STp->first_frame_position); +#endif + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, DMA_TO_DEVICE, + STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + + if (STp->buffer->syscall_result) { /* additional write error */ + if ((SRpnt->sr_sense_buffer[ 2] & 0x0f) == 13 && + SRpnt->sr_sense_buffer[12] == 0 && + SRpnt->sr_sense_buffer[13] == 2) { + printk(KERN_ERR + "%s:E: Volume overflow in write error recovery\n", + name); + break; /* hit end of tape = fail */ + } + flag = 1; + } + else + pending = 0; + + continue; + } + if (STp->cur_frames == 0) { +#if DEBUG + debugging = dbg; + printk(OSST_DEB_MSG "%s:D: Wait re-write finished\n", name); +#endif + if (STp->first_frame_position != expected) { + printk(KERN_ERR "%s:A: Actual position %d - expected %d\n", + name, STp->first_frame_position, expected); + return (-EIO); + } + return 0; + } +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG "%s:D: Sleeping in re-write wait ready\n", name); + printk(OSST_DEB_MSG "%s:D: Turning off debugging for a while\n", name); + debugging = 0; + } +#endif + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(HZ / 10); + } + printk(KERN_ERR "%s:E: Failed to find valid tape media\n", name); +#if DEBUG + debugging = dbg; +#endif + return (-EIO); +} + +/* + * Error recovery algorithm for the OnStream tape. + */ + +static int osst_write_error_recovery(struct osst_tape * STp, struct scsi_request ** aSRpnt, int pending) +{ + struct scsi_request * SRpnt = * aSRpnt; + struct st_partstat * STps = & STp->ps[STp->partition]; + char * name = tape_name(STp); + int retval = 0; + int rw_state; + unsigned int frame, skip; + + rw_state = STps->rw; + + if ((SRpnt->sr_sense_buffer[ 2] & 0x0f) != 3 + || SRpnt->sr_sense_buffer[12] != 12 + || SRpnt->sr_sense_buffer[13] != 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Write error recovery cannot handle %02x:%02x:%02x\n", name, + SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]); +#endif + return (-EIO); + } + frame = (SRpnt->sr_sense_buffer[3] << 24) | + (SRpnt->sr_sense_buffer[4] << 16) | + (SRpnt->sr_sense_buffer[5] << 8) | + SRpnt->sr_sense_buffer[6]; + skip = SRpnt->sr_sense_buffer[9]; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Detected physical bad frame at %u, advised to skip %d\n", name, frame, skip); +#endif + osst_get_frame_position(STp, aSRpnt); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: reported frame positions: host = %d, tape = %d\n", + name, STp->first_frame_position, STp->last_frame_position); +#endif + switch (STp->write_type) { + case OS_WRITE_DATA: + case OS_WRITE_EOD: + case OS_WRITE_NEW_MARK: + printk(KERN_WARNING + "%s:I: Relocating %d buffered logical frames from position %u to %u\n", + name, STp->cur_frames, frame, (frame + skip > 3000 && frame < 3000)?3000:frame + skip); + if (STp->os_fw_rev >= 10600) + retval = osst_reposition_and_retry(STp, aSRpnt, frame, skip, pending); + else + retval = osst_read_back_buffer_and_rewrite(STp, aSRpnt, frame, skip, pending); + printk(KERN_WARNING "%s:%s: %sWrite error%srecovered\n", name, + retval?"E" :"I", + retval?"" :"Don't worry, ", + retval?" not ":" "); + break; + case OS_WRITE_LAST_MARK: + printk(KERN_ERR "%s:E: Bad frame in update last marker, fatal\n", name); + osst_set_frame_position(STp, aSRpnt, frame + STp->cur_frames + pending, 0); + retval = -EIO; + break; + case OS_WRITE_HEADER: + printk(KERN_WARNING "%s:I: Bad frame in header partition, skipped\n", name); + retval = osst_read_back_buffer_and_rewrite(STp, aSRpnt, frame, 1, pending); + break; + default: + printk(KERN_INFO "%s:I: Bad frame in filler, ignored\n", name); + osst_set_frame_position(STp, aSRpnt, frame + STp->cur_frames + pending, 0); + } + osst_get_frame_position(STp, aSRpnt); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Positioning complete, cur_frames %d, pos %d, tape pos %d\n", + name, STp->cur_frames, STp->first_frame_position, STp->last_frame_position); + printk(OSST_DEB_MSG "%s:D: next logical frame to write: %d\n", name, STp->logical_blk_num); +#endif + if (retval == 0) { + STp->recover_count++; + STp->recover_erreg++; + } else + STp->abort_count++; + + STps->rw = rw_state; + return retval; +} + +static int osst_space_over_filemarks_backward(struct osst_tape * STp, struct scsi_request ** aSRpnt, + int mt_op, int mt_count) +{ + char * name = tape_name(STp); + int cnt; + int last_mark_ppos = -1; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reached space_over_filemarks_backwards %d %d\n", name, mt_op, mt_count); +#endif + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks_bwd\n", name); +#endif + return -EIO; + } + if (STp->linux_media_version >= 4) { + /* + * direct lookup in header filemark list + */ + cnt = ntohl(STp->buffer->aux->filemark_cnt); + if (STp->header_ok && + STp->header_cache != NULL && + (cnt - mt_count) >= 0 && + (cnt - mt_count) < OS_FM_TAB_MAX && + (cnt - mt_count) < STp->filemark_cnt && + STp->header_cache->dat_fm_tab.fm_tab_ent[cnt-1] == STp->buffer->aux->last_mark_ppos) + + last_mark_ppos = ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[cnt - mt_count]); +#if DEBUG + if (STp->header_cache == NULL || (cnt - mt_count) < 0 || (cnt - mt_count) >= OS_FM_TAB_MAX) + printk(OSST_DEB_MSG "%s:D: Filemark lookup fail due to %s\n", name, + STp->header_cache == NULL?"lack of header cache":"count out of range"); + else + printk(OSST_DEB_MSG "%s:D: Filemark lookup: prev mark %d (%s), skip %d to %d\n", + name, cnt, + ((cnt == -1 && ntohl(STp->buffer->aux->last_mark_ppos) == -1) || + (STp->header_cache->dat_fm_tab.fm_tab_ent[cnt-1] == + STp->buffer->aux->last_mark_ppos))?"match":"error", + mt_count, last_mark_ppos); +#endif + if (last_mark_ppos > 10 && last_mark_ppos < STp->eod_frame_ppos) { + osst_position_tape_and_confirm(STp, aSRpnt, last_mark_ppos); + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Couldn't get logical blk num in space_filemarks\n", name); +#endif + return (-EIO); + } + if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) { + printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n", + name, last_mark_ppos); + return (-EIO); + } + goto found; + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reverting to scan filemark backwards\n", name); +#endif + } + cnt = 0; + while (cnt != mt_count) { + last_mark_ppos = ntohl(STp->buffer->aux->last_mark_ppos); + if (last_mark_ppos == -1) + return (-EIO); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Positioning to last mark at %d\n", name, last_mark_ppos); +#endif + osst_position_tape_and_confirm(STp, aSRpnt, last_mark_ppos); + cnt++; + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n", name); +#endif + return (-EIO); + } + if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) { + printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n", + name, last_mark_ppos); + return (-EIO); + } + } +found: + if (mt_op == MTBSFM) { + STp->frame_seq_number++; + STp->frame_in_buffer = 0; + STp->buffer->buffer_bytes = 0; + STp->buffer->read_pointer = 0; + STp->logical_blk_num += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt); + } + return 0; +} + +/* + * ADRL 1.1 compatible "slow" space filemarks fwd version + * + * Just scans for the filemark sequentially. + */ +static int osst_space_over_filemarks_forward_slow(struct osst_tape * STp, struct scsi_request ** aSRpnt, + int mt_op, int mt_count) +{ + int cnt = 0; +#if DEBUG + char * name = tape_name(STp); + + printk(OSST_DEB_MSG "%s:D: Reached space_over_filemarks_forward_slow %d %d\n", name, mt_op, mt_count); +#endif + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks_fwd\n", name); +#endif + return (-EIO); + } + while (1) { + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n", name); +#endif + return (-EIO); + } + if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_MARKER) + cnt++; + if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_EOD) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: space_fwd: EOD reached\n", name); +#endif + if (STp->first_frame_position > STp->eod_frame_ppos+1) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: EOD position corrected (%d=>%d)\n", + name, STp->eod_frame_ppos, STp->first_frame_position-1); +#endif + STp->eod_frame_ppos = STp->first_frame_position-1; + } + return (-EIO); + } + if (cnt == mt_count) + break; + STp->frame_in_buffer = 0; + } + if (mt_op == MTFSF) { + STp->frame_seq_number++; + STp->frame_in_buffer = 0; + STp->buffer->buffer_bytes = 0; + STp->buffer->read_pointer = 0; + STp->logical_blk_num += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt); + } + return 0; +} + +/* + * Fast linux specific version of OnStream FSF + */ +static int osst_space_over_filemarks_forward_fast(struct osst_tape * STp, struct scsi_request ** aSRpnt, + int mt_op, int mt_count) +{ + char * name = tape_name(STp); + int cnt = 0, + next_mark_ppos = -1; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reached space_over_filemarks_forward_fast %d %d\n", name, mt_op, mt_count); +#endif + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks_fwd\n", name); +#endif + return (-EIO); + } + + if (STp->linux_media_version >= 4) { + /* + * direct lookup in header filemark list + */ + cnt = ntohl(STp->buffer->aux->filemark_cnt) - 1; + if (STp->header_ok && + STp->header_cache != NULL && + (cnt + mt_count) < OS_FM_TAB_MAX && + (cnt + mt_count) < STp->filemark_cnt && + ((cnt == -1 && ntohl(STp->buffer->aux->last_mark_ppos) == -1) || + (STp->header_cache->dat_fm_tab.fm_tab_ent[cnt] == STp->buffer->aux->last_mark_ppos))) + + next_mark_ppos = ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[cnt + mt_count]); +#if DEBUG + if (STp->header_cache == NULL || (cnt + mt_count) >= OS_FM_TAB_MAX) + printk(OSST_DEB_MSG "%s:D: Filemark lookup fail due to %s\n", name, + STp->header_cache == NULL?"lack of header cache":"count out of range"); + else + printk(OSST_DEB_MSG "%s:D: Filemark lookup: prev mark %d (%s), skip %d to %d\n", + name, cnt, + ((cnt == -1 && ntohl(STp->buffer->aux->last_mark_ppos) == -1) || + (STp->header_cache->dat_fm_tab.fm_tab_ent[cnt] == + STp->buffer->aux->last_mark_ppos))?"match":"error", + mt_count, next_mark_ppos); +#endif + if (next_mark_ppos <= 10 || next_mark_ppos > STp->eod_frame_ppos) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reverting to slow filemark space\n", name); +#endif + return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count); + } else { + osst_position_tape_and_confirm(STp, aSRpnt, next_mark_ppos); + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n", + name); +#endif + return (-EIO); + } + if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) { + printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n", + name, next_mark_ppos); + return (-EIO); + } + if (ntohl(STp->buffer->aux->filemark_cnt) != cnt + mt_count) { + printk(KERN_WARNING "%s:W: Expected to find marker %d at ppos %d, not %d\n", + name, cnt+mt_count, next_mark_ppos, + ntohl(STp->buffer->aux->filemark_cnt)); + return (-EIO); + } + } + } else { + /* + * Find nearest (usually previous) marker, then jump from marker to marker + */ + while (1) { + if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_MARKER) + break; + if (STp->buffer->aux->frame_type == OS_FRAME_TYPE_EOD) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: space_fwd: EOD reached\n", name); +#endif + return (-EIO); + } + if (ntohl(STp->buffer->aux->filemark_cnt) == 0) { + if (STp->first_mark_ppos == -1) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reverting to slow filemark space\n", name); +#endif + return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count); + } + osst_position_tape_and_confirm(STp, aSRpnt, STp->first_mark_ppos); + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Couldn't get logical blk num in space_filemarks_fwd_fast\n", + name); +#endif + return (-EIO); + } + if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) { + printk(KERN_WARNING "%s:W: Expected to find filemark at %d\n", + name, STp->first_mark_ppos); + return (-EIO); + } + } else { + if (osst_space_over_filemarks_backward(STp, aSRpnt, MTBSF, 1) < 0) + return (-EIO); + mt_count++; + } + } + cnt++; + while (cnt != mt_count) { + next_mark_ppos = ntohl(STp->buffer->aux->next_mark_ppos); + if (!next_mark_ppos || next_mark_ppos > STp->eod_frame_ppos) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reverting to slow filemark space\n", name); +#endif + return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count - cnt); + } +#if DEBUG + else printk(OSST_DEB_MSG "%s:D: Positioning to next mark at %d\n", name, next_mark_ppos); +#endif + osst_position_tape_and_confirm(STp, aSRpnt, next_mark_ppos); + cnt++; + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in space_filemarks\n", + name); +#endif + return (-EIO); + } + if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) { + printk(KERN_WARNING "%s:W: Expected to find marker at ppos %d, not found\n", + name, next_mark_ppos); + return (-EIO); + } + } + } + if (mt_op == MTFSF) { + STp->frame_seq_number++; + STp->frame_in_buffer = 0; + STp->buffer->buffer_bytes = 0; + STp->buffer->read_pointer = 0; + STp->logical_blk_num += ntohs(STp->buffer->aux->dat.dat_list[0].blk_cnt); + } + return 0; +} + +/* + * In debug mode, we want to see as many errors as possible + * to test the error recovery mechanism. + */ +#if DEBUG +static void osst_set_retries(struct osst_tape * STp, struct scsi_request ** aSRpnt, int retries) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt = * aSRpnt; + char * name = tape_name(STp); + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SELECT; + cmd[1] = 0x10; + cmd[4] = NUMBER_RETRIES_PAGE_LENGTH + MODE_HEADER_LENGTH; + + (STp->buffer)->b_data[0] = cmd[4] - 1; + (STp->buffer)->b_data[1] = 0; /* Medium Type - ignoring */ + (STp->buffer)->b_data[2] = 0; /* Reserved */ + (STp->buffer)->b_data[3] = 0; /* Block Descriptor Length */ + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 0] = NUMBER_RETRIES_PAGE | (1 << 7); + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 1] = 2; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] = 4; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] = retries; + + if (debugging) + printk(OSST_DEB_MSG "%s:D: Setting number of retries on OnStream tape to %d\n", name, retries); + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1); + *aSRpnt = SRpnt; + + if ((STp->buffer)->syscall_result) + printk (KERN_ERR "%s:D: Couldn't set retries to %d\n", name, retries); +} +#endif + + +static int osst_write_filemark(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + int result; + int this_mark_ppos = STp->first_frame_position; + int this_mark_lbn = STp->logical_blk_num; +#if DEBUG + char * name = tape_name(STp); +#endif + + if (STp->raw) return 0; + + STp->write_type = OS_WRITE_NEW_MARK; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Writing Filemark %i at fppos %d (fseq %d, lblk %d)\n", + name, STp->filemark_cnt, this_mark_ppos, STp->frame_seq_number, this_mark_lbn); +#endif + STp->dirty = 1; + result = osst_flush_write_buffer(STp, aSRpnt); + result |= osst_flush_drive_buffer(STp, aSRpnt); + STp->last_mark_ppos = this_mark_ppos; + STp->last_mark_lbn = this_mark_lbn; + if (STp->header_cache != NULL && STp->filemark_cnt < OS_FM_TAB_MAX) + STp->header_cache->dat_fm_tab.fm_tab_ent[STp->filemark_cnt] = htonl(this_mark_ppos); + if (STp->filemark_cnt++ == 0) + STp->first_mark_ppos = this_mark_ppos; + return result; +} + +static int osst_write_eod(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + int result; +#if DEBUG + char * name = tape_name(STp); +#endif + + if (STp->raw) return 0; + + STp->write_type = OS_WRITE_EOD; + STp->eod_frame_ppos = STp->first_frame_position; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Writing EOD at fppos %d (fseq %d, lblk %d)\n", name, + STp->eod_frame_ppos, STp->frame_seq_number, STp->logical_blk_num); +#endif + STp->dirty = 1; + + result = osst_flush_write_buffer(STp, aSRpnt); + result |= osst_flush_drive_buffer(STp, aSRpnt); + STp->eod_frame_lfa = --(STp->frame_seq_number); + return result; +} + +static int osst_write_filler(struct osst_tape * STp, struct scsi_request ** aSRpnt, int where, int count) +{ + char * name = tape_name(STp); + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reached onstream write filler group %d\n", name, where); +#endif + osst_wait_ready(STp, aSRpnt, 60 * 5, 0); + osst_set_frame_position(STp, aSRpnt, where, 0); + STp->write_type = OS_WRITE_FILLER; + while (count--) { + memcpy(STp->buffer->b_data, "Filler", 6); + STp->buffer->buffer_bytes = 6; + STp->dirty = 1; + if (osst_flush_write_buffer(STp, aSRpnt)) { + printk(KERN_INFO "%s:I: Couldn't write filler frame\n", name); + return (-EIO); + } + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Exiting onstream write filler group\n", name); +#endif + return osst_flush_drive_buffer(STp, aSRpnt); +} + +static int __osst_write_header(struct osst_tape * STp, struct scsi_request ** aSRpnt, int where, int count) +{ + char * name = tape_name(STp); + int result; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reached onstream write header group %d\n", name, where); +#endif + osst_wait_ready(STp, aSRpnt, 60 * 5, 0); + osst_set_frame_position(STp, aSRpnt, where, 0); + STp->write_type = OS_WRITE_HEADER; + while (count--) { + osst_copy_to_buffer(STp->buffer, (unsigned char *)STp->header_cache); + STp->buffer->buffer_bytes = sizeof(os_header_t); + STp->dirty = 1; + if (osst_flush_write_buffer(STp, aSRpnt)) { + printk(KERN_INFO "%s:I: Couldn't write header frame\n", name); + return (-EIO); + } + } + result = osst_flush_drive_buffer(STp, aSRpnt); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Write onstream header group %s\n", name, result?"failed":"done"); +#endif + return result; +} + +static int osst_write_header(struct osst_tape * STp, struct scsi_request ** aSRpnt, int locate_eod) +{ + os_header_t * header; + int result; + char * name = tape_name(STp); + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Writing tape header\n", name); +#endif + if (STp->raw) return 0; + + if (STp->header_cache == NULL) { + if ((STp->header_cache = (os_header_t *)vmalloc(sizeof(os_header_t))) == NULL) { + printk(KERN_ERR "%s:E: Failed to allocate header cache\n", name); + return (-ENOMEM); + } + memset(STp->header_cache, 0, sizeof(os_header_t)); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Allocated and cleared memory for header cache\n", name); +#endif + } + if (STp->header_ok) STp->update_frame_cntr++; + else STp->update_frame_cntr = 0; + + header = STp->header_cache; + strcpy(header->ident_str, "ADR_SEQ"); + header->major_rev = 1; + header->minor_rev = 4; + header->ext_trk_tb_off = htons(17192); + header->pt_par_num = 1; + header->partition[0].partition_num = OS_DATA_PARTITION; + header->partition[0].par_desc_ver = OS_PARTITION_VERSION; + header->partition[0].wrt_pass_cntr = htons(STp->wrt_pass_cntr); + header->partition[0].first_frame_ppos = htonl(STp->first_data_ppos); + header->partition[0].last_frame_ppos = htonl(STp->capacity); + header->partition[0].eod_frame_ppos = htonl(STp->eod_frame_ppos); + header->cfg_col_width = htonl(20); + header->dat_col_width = htonl(1500); + header->qfa_col_width = htonl(0); + header->ext_track_tb.nr_stream_part = 1; + header->ext_track_tb.et_ent_sz = 32; + header->ext_track_tb.dat_ext_trk_ey.et_part_num = 0; + header->ext_track_tb.dat_ext_trk_ey.fmt = 1; + header->ext_track_tb.dat_ext_trk_ey.fm_tab_off = htons(17736); + header->ext_track_tb.dat_ext_trk_ey.last_hlb_hi = 0; + header->ext_track_tb.dat_ext_trk_ey.last_hlb = htonl(STp->eod_frame_lfa); + header->ext_track_tb.dat_ext_trk_ey.last_pp = htonl(STp->eod_frame_ppos); + header->dat_fm_tab.fm_part_num = 0; + header->dat_fm_tab.fm_tab_ent_sz = 4; + header->dat_fm_tab.fm_tab_ent_cnt = htons(STp->filemark_cnt<OS_FM_TAB_MAX? + STp->filemark_cnt:OS_FM_TAB_MAX); + + result = __osst_write_header(STp, aSRpnt, 0xbae, 5); + if (STp->update_frame_cntr == 0) + osst_write_filler(STp, aSRpnt, 0xbb3, 5); + result &= __osst_write_header(STp, aSRpnt, 5, 5); + + if (locate_eod) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Locating back to eod frame addr %d\n", name, STp->eod_frame_ppos); +#endif + osst_set_frame_position(STp, aSRpnt, STp->eod_frame_ppos, 0); + } + if (result) + printk(KERN_ERR "%s:E: Write header failed\n", name); + else { + memcpy(STp->application_sig, "LIN4", 4); + STp->linux_media = 1; + STp->linux_media_version = 4; + STp->header_ok = 1; + } + return result; +} + +static int osst_reset_header(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + if (STp->header_cache != NULL) + memset(STp->header_cache, 0, sizeof(os_header_t)); + + STp->logical_blk_num = STp->frame_seq_number = 0; + STp->frame_in_buffer = 0; + STp->eod_frame_ppos = STp->first_data_ppos = 0x0000000A; + STp->filemark_cnt = 0; + STp->first_mark_ppos = STp->last_mark_ppos = STp->last_mark_lbn = -1; + return osst_write_header(STp, aSRpnt, 1); +} + +static int __osst_analyze_headers(struct osst_tape * STp, struct scsi_request ** aSRpnt, int ppos) +{ + char * name = tape_name(STp); + os_header_t * header; + os_aux_t * aux; + char id_string[8]; + int linux_media_version, + update_frame_cntr; + + if (STp->raw) + return 1; + + if (ppos == 5 || ppos == 0xbae || STp->buffer->syscall_result) { + if (osst_set_frame_position(STp, aSRpnt, ppos, 0)) + printk(KERN_WARNING "%s:W: Couldn't position tape\n", name); + osst_wait_ready(STp, aSRpnt, 60 * 15, 0); + if (osst_initiate_read (STp, aSRpnt)) { + printk(KERN_WARNING "%s:W: Couldn't initiate read\n", name); + return 0; + } + } + if (osst_read_frame(STp, aSRpnt, 180)) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't read header frame\n", name); +#endif + return 0; + } + header = (os_header_t *) STp->buffer->b_data; /* warning: only first segment addressable */ + aux = STp->buffer->aux; + if (aux->frame_type != OS_FRAME_TYPE_HEADER) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping non-header frame (%d)\n", name, ppos); +#endif + return 0; + } + if (ntohl(aux->frame_seq_num) != 0 || + ntohl(aux->logical_blk_num) != 0 || + aux->partition.partition_num != OS_CONFIG_PARTITION || + ntohl(aux->partition.first_frame_ppos) != 0 || + ntohl(aux->partition.last_frame_ppos) != 0xbb7 ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Invalid header frame (%d,%d,%d,%d,%d)\n", name, + ntohl(aux->frame_seq_num), ntohl(aux->logical_blk_num), + aux->partition.partition_num, ntohl(aux->partition.first_frame_ppos), + ntohl(aux->partition.last_frame_ppos)); +#endif + return 0; + } + if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0 && + strncmp(header->ident_str, "ADR-SEQ", 7) != 0) { + strlcpy(id_string, header->ident_str, 8); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Invalid header identification string %s\n", name, id_string); +#endif + return 0; + } + update_frame_cntr = ntohl(aux->update_frame_cntr); + if (update_frame_cntr < STp->update_frame_cntr) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame %d with update_frame_counter %d<%d\n", + name, ppos, update_frame_cntr, STp->update_frame_cntr); +#endif + return 0; + } + if (header->major_rev != 1 || header->minor_rev != 4 ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: %s revision %d.%d detected (1.4 supported)\n", + name, (header->major_rev != 1 || header->minor_rev < 2 || + header->minor_rev > 4 )? "Invalid" : "Warning:", + header->major_rev, header->minor_rev); +#endif + if (header->major_rev != 1 || header->minor_rev < 2 || header->minor_rev > 4) + return 0; + } +#if DEBUG + if (header->pt_par_num != 1) + printk(KERN_INFO "%s:W: %d partitions defined, only one supported\n", + name, header->pt_par_num); +#endif + memcpy(id_string, aux->application_sig, 4); + id_string[4] = 0; + if (memcmp(id_string, "LIN", 3) == 0) { + STp->linux_media = 1; + linux_media_version = id_string[3] - '0'; + if (linux_media_version != 4) + printk(KERN_INFO "%s:I: Linux media version %d detected (current 4)\n", + name, linux_media_version); + } else { + printk(KERN_WARNING "%s:W: Non Linux media detected (%s)\n", name, id_string); + return 0; + } + if (linux_media_version < STp->linux_media_version) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping frame %d with linux_media_version %d\n", + name, ppos, linux_media_version); +#endif + return 0; + } + if (linux_media_version > STp->linux_media_version) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Frame %d sets linux_media_version to %d\n", + name, ppos, linux_media_version); +#endif + memcpy(STp->application_sig, id_string, 5); + STp->linux_media_version = linux_media_version; + STp->update_frame_cntr = -1; + } + if (update_frame_cntr > STp->update_frame_cntr) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Frame %d sets update_frame_counter to %d\n", + name, ppos, update_frame_cntr); +#endif + if (STp->header_cache == NULL) { + if ((STp->header_cache = (os_header_t *)vmalloc(sizeof(os_header_t))) == NULL) { + printk(KERN_ERR "%s:E: Failed to allocate header cache\n", name); + return 0; + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Allocated memory for header cache\n", name); +#endif + } + osst_copy_from_buffer(STp->buffer, (unsigned char *)STp->header_cache); + header = STp->header_cache; /* further accesses from cached (full) copy */ + + STp->wrt_pass_cntr = ntohs(header->partition[0].wrt_pass_cntr); + STp->first_data_ppos = ntohl(header->partition[0].first_frame_ppos); + STp->eod_frame_ppos = ntohl(header->partition[0].eod_frame_ppos); + STp->eod_frame_lfa = ntohl(header->ext_track_tb.dat_ext_trk_ey.last_hlb); + STp->filemark_cnt = ntohl(aux->filemark_cnt); + STp->first_mark_ppos = ntohl(aux->next_mark_ppos); + STp->last_mark_ppos = ntohl(aux->last_mark_ppos); + STp->last_mark_lbn = ntohl(aux->last_mark_lbn); + STp->update_frame_cntr = update_frame_cntr; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Detected write pass %d, update frame counter %d, filemark counter %d\n", + name, STp->wrt_pass_cntr, STp->update_frame_cntr, STp->filemark_cnt); + printk(OSST_DEB_MSG "%s:D: first data frame on tape = %d, last = %d, eod frame = %d\n", name, + STp->first_data_ppos, + ntohl(header->partition[0].last_frame_ppos), + ntohl(header->partition[0].eod_frame_ppos)); + printk(OSST_DEB_MSG "%s:D: first mark on tape = %d, last = %d, eod frame = %d\n", + name, STp->first_mark_ppos, STp->last_mark_ppos, STp->eod_frame_ppos); +#endif + if (header->minor_rev < 4 && STp->linux_media_version == 4) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Moving filemark list to ADR 1.4 location\n", name); +#endif + memcpy((void *)header->dat_fm_tab.fm_tab_ent, + (void *)header->old_filemark_list, sizeof(header->dat_fm_tab.fm_tab_ent)); + memset((void *)header->old_filemark_list, 0, sizeof(header->old_filemark_list)); + } + if (header->minor_rev == 4 && + (header->ext_trk_tb_off != htons(17192) || + header->partition[0].partition_num != OS_DATA_PARTITION || + header->partition[0].par_desc_ver != OS_PARTITION_VERSION || + header->partition[0].last_frame_ppos != htonl(STp->capacity) || + header->cfg_col_width != htonl(20) || + header->dat_col_width != htonl(1500) || + header->qfa_col_width != htonl(0) || + header->ext_track_tb.nr_stream_part != 1 || + header->ext_track_tb.et_ent_sz != 32 || + header->ext_track_tb.dat_ext_trk_ey.et_part_num != OS_DATA_PARTITION || + header->ext_track_tb.dat_ext_trk_ey.fmt != 1 || + header->ext_track_tb.dat_ext_trk_ey.fm_tab_off != htons(17736) || + header->ext_track_tb.dat_ext_trk_ey.last_hlb_hi != 0 || + header->ext_track_tb.dat_ext_trk_ey.last_pp != htonl(STp->eod_frame_ppos) || + header->dat_fm_tab.fm_part_num != OS_DATA_PARTITION || + header->dat_fm_tab.fm_tab_ent_sz != 4 || + header->dat_fm_tab.fm_tab_ent_cnt != + htons(STp->filemark_cnt<OS_FM_TAB_MAX?STp->filemark_cnt:OS_FM_TAB_MAX))) + printk(KERN_WARNING "%s:W: Failed consistency check ADR 1.4 format\n", name); + + } + + return 1; +} + +static int osst_analyze_headers(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + int position, ppos; + int first, last; + int valid = 0; + char * name = tape_name(STp); + + position = osst_get_frame_position(STp, aSRpnt); + + if (STp->raw) { + STp->header_ok = STp->linux_media = 1; + STp->linux_media_version = 0; + return 1; + } + STp->header_ok = STp->linux_media = STp->linux_media_version = 0; + STp->wrt_pass_cntr = STp->update_frame_cntr = -1; + STp->eod_frame_ppos = STp->first_data_ppos = -1; + STp->first_mark_ppos = STp->last_mark_ppos = STp->last_mark_lbn = -1; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reading header\n", name); +#endif + + /* optimization for speed - if we are positioned at ppos 10, read second group first */ + /* TODO try the ADR 1.1 locations for the second group if we have no valid one yet... */ + + first = position==10?0xbae: 5; + last = position==10?0xbb3:10; + + for (ppos = first; ppos < last; ppos++) + if (__osst_analyze_headers(STp, aSRpnt, ppos)) + valid = 1; + + first = position==10? 5:0xbae; + last = position==10?10:0xbb3; + + for (ppos = first; ppos < last; ppos++) + if (__osst_analyze_headers(STp, aSRpnt, ppos)) + valid = 1; + + if (!valid) { + printk(KERN_ERR "%s:E: Failed to find valid ADRL header, new media?\n", name); + STp->eod_frame_ppos = STp->first_data_ppos = 0; + osst_set_frame_position(STp, aSRpnt, 10, 0); + return 0; + } + if (position <= STp->first_data_ppos) { + position = STp->first_data_ppos; + STp->ps[0].drv_file = STp->ps[0].drv_block = STp->frame_seq_number = STp->logical_blk_num = 0; + } + osst_set_frame_position(STp, aSRpnt, position, 0); + STp->header_ok = 1; + + return 1; +} + +static int osst_verify_position(struct osst_tape * STp, struct scsi_request ** aSRpnt) +{ + int frame_position = STp->first_frame_position; + int frame_seq_numbr = STp->frame_seq_number; + int logical_blk_num = STp->logical_blk_num; + int halfway_frame = STp->frame_in_buffer; + int read_pointer = STp->buffer->read_pointer; + int prev_mark_ppos = -1; + int actual_mark_ppos, i, n; +#if DEBUG + char * name = tape_name(STp); + + printk(OSST_DEB_MSG "%s:D: Verify that the tape is really the one we think before writing\n", name); +#endif + osst_set_frame_position(STp, aSRpnt, frame_position - 1, 0); + if (osst_get_logical_frame(STp, aSRpnt, -1, 0) < 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't get logical blk num in verify_position\n", name); +#endif + return (-EIO); + } + if (STp->linux_media_version >= 4) { + for (i=0; i<STp->filemark_cnt; i++) + if ((n=ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[i])) < frame_position) + prev_mark_ppos = n; + } else + prev_mark_ppos = frame_position - 1; /* usually - we don't really know */ + actual_mark_ppos = STp->buffer->aux->frame_type == OS_FRAME_TYPE_MARKER ? + frame_position - 1 : ntohl(STp->buffer->aux->last_mark_ppos); + if (frame_position != STp->first_frame_position || + frame_seq_numbr != STp->frame_seq_number + (halfway_frame?0:1) || + prev_mark_ppos != actual_mark_ppos ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Block mismatch: fppos %d-%d, fseq %d-%d, mark %d-%d\n", name, + STp->first_frame_position, frame_position, + STp->frame_seq_number + (halfway_frame?0:1), + frame_seq_numbr, actual_mark_ppos, prev_mark_ppos); +#endif + return (-EIO); + } + if (halfway_frame) { + /* prepare buffer for append and rewrite on top of original */ + osst_set_frame_position(STp, aSRpnt, frame_position - 1, 0); + STp->buffer->buffer_bytes = read_pointer; + STp->ps[STp->partition].rw = ST_WRITING; + STp->dirty = 1; + } + STp->frame_in_buffer = halfway_frame; + STp->frame_seq_number = frame_seq_numbr; + STp->logical_blk_num = logical_blk_num; + return 0; +} + +/* Acc. to OnStream, the vers. numbering is the following: + * X.XX for released versions (X=digit), + * XXXY for unreleased versions (Y=letter) + * Ordering 1.05 < 106A < 106B < ... < 106a < ... < 1.06 + * This fn makes monoton numbers out of this scheme ... + */ +static unsigned int osst_parse_firmware_rev (const char * str) +{ + if (str[1] == '.') { + return (str[0]-'0')*10000 + +(str[2]-'0')*1000 + +(str[3]-'0')*100; + } else { + return (str[0]-'0')*10000 + +(str[1]-'0')*1000 + +(str[2]-'0')*100 - 100 + +(str[3]-'@'); + } +} + +/* + * Configure the OnStream SCII tape drive for default operation + */ +static int osst_configure_onstream(struct osst_tape *STp, struct scsi_request ** aSRpnt) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + char * name = tape_name(STp); + struct scsi_request * SRpnt = * aSRpnt; + osst_mode_parameter_header_t * header; + osst_block_size_page_t * bs; + osst_capabilities_page_t * cp; + osst_tape_paramtr_page_t * prm; + int drive_buffer_size; + + if (STp->ready != ST_READY) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Not Ready\n", name); +#endif + return (-EIO); + } + + if (STp->os_fw_rev < 10600) { + printk(KERN_INFO "%s:I: Old OnStream firmware revision detected (%s),\n", name, STp->device->rev); + printk(KERN_INFO "%s:I: an upgrade to version 1.06 or above is recommended\n", name); + } + + /* + * Configure 32.5KB (data+aux) frame size. + * Get the current frame size from the block size mode page + */ + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SENSE; + cmd[1] = 8; + cmd[2] = BLOCK_SIZE_PAGE; + cmd[4] = BLOCK_SIZE_PAGE_LENGTH + MODE_HEADER_LENGTH; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1); + if (SRpnt == NULL) { +#if DEBUG + printk(OSST_DEB_MSG "osst :D: Busy\n"); +#endif + return (-EBUSY); + } + *aSRpnt = SRpnt; + if ((STp->buffer)->syscall_result != 0) { + printk (KERN_ERR "%s:E: Can't get tape block size mode page\n", name); + return (-EIO); + } + + header = (osst_mode_parameter_header_t *) (STp->buffer)->b_data; + bs = (osst_block_size_page_t *) ((STp->buffer)->b_data + sizeof(osst_mode_parameter_header_t) + header->bdl); + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: 32KB play back: %s\n", name, bs->play32 ? "Yes" : "No"); + printk(OSST_DEB_MSG "%s:D: 32.5KB play back: %s\n", name, bs->play32_5 ? "Yes" : "No"); + printk(OSST_DEB_MSG "%s:D: 32KB record: %s\n", name, bs->record32 ? "Yes" : "No"); + printk(OSST_DEB_MSG "%s:D: 32.5KB record: %s\n", name, bs->record32_5 ? "Yes" : "No"); +#endif + + /* + * Configure default auto columns mode, 32.5KB transfer mode + */ + bs->one = 1; + bs->play32 = 0; + bs->play32_5 = 1; + bs->record32 = 0; + bs->record32_5 = 1; + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SELECT; + cmd[1] = 0x10; + cmd[4] = BLOCK_SIZE_PAGE_LENGTH + MODE_HEADER_LENGTH; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1); + *aSRpnt = SRpnt; + if ((STp->buffer)->syscall_result != 0) { + printk (KERN_ERR "%s:E: Couldn't set tape block size mode page\n", name); + return (-EIO); + } + +#if DEBUG + printk(KERN_INFO "%s:D: Drive Block Size changed to 32.5K\n", name); + /* + * In debug mode, we want to see as many errors as possible + * to test the error recovery mechanism. + */ + osst_set_retries(STp, aSRpnt, 0); + SRpnt = * aSRpnt; +#endif + + /* + * Set vendor name to 'LIN4' for "Linux support version 4". + */ + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SELECT; + cmd[1] = 0x10; + cmd[4] = VENDOR_IDENT_PAGE_LENGTH + MODE_HEADER_LENGTH; + + header->mode_data_length = VENDOR_IDENT_PAGE_LENGTH + MODE_HEADER_LENGTH - 1; + header->medium_type = 0; /* Medium Type - ignoring */ + header->dsp = 0; /* Reserved */ + header->bdl = 0; /* Block Descriptor Length */ + + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 0] = VENDOR_IDENT_PAGE | (1 << 7); + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 1] = 6; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] = 'L'; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] = 'I'; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 4] = 'N'; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 5] = '4'; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 6] = 0; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 7] = 0; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1); + *aSRpnt = SRpnt; + + if ((STp->buffer)->syscall_result != 0) { + printk (KERN_ERR "%s:E: Couldn't set vendor name to %s\n", name, + (char *) ((STp->buffer)->b_data + MODE_HEADER_LENGTH + 2)); + return (-EIO); + } + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SENSE; + cmd[1] = 8; + cmd[2] = CAPABILITIES_PAGE; + cmd[4] = CAPABILITIES_PAGE_LENGTH + MODE_HEADER_LENGTH; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1); + *aSRpnt = SRpnt; + + if ((STp->buffer)->syscall_result != 0) { + printk (KERN_ERR "%s:E: Can't get capabilities page\n", name); + return (-EIO); + } + + header = (osst_mode_parameter_header_t *) (STp->buffer)->b_data; + cp = (osst_capabilities_page_t *) ((STp->buffer)->b_data + + sizeof(osst_mode_parameter_header_t) + header->bdl); + + drive_buffer_size = ntohs(cp->buffer_size) / 2; + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SENSE; + cmd[1] = 8; + cmd[2] = TAPE_PARAMTR_PAGE; + cmd[4] = TAPE_PARAMTR_PAGE_LENGTH + MODE_HEADER_LENGTH; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1); + *aSRpnt = SRpnt; + + if ((STp->buffer)->syscall_result != 0) { + printk (KERN_ERR "%s:E: Can't get tape parameter page\n", name); + return (-EIO); + } + + header = (osst_mode_parameter_header_t *) (STp->buffer)->b_data; + prm = (osst_tape_paramtr_page_t *) ((STp->buffer)->b_data + + sizeof(osst_mode_parameter_header_t) + header->bdl); + + STp->density = prm->density; + STp->capacity = ntohs(prm->segtrk) * ntohs(prm->trks); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Density %d, tape length: %dMB, drive buffer size: %dKB\n", + name, STp->density, STp->capacity / 32, drive_buffer_size); +#endif + + return 0; + +} + + +/* Step over EOF if it has been inadvertently crossed (ioctl not used because + it messes up the block number). */ +static int cross_eof(struct osst_tape *STp, struct scsi_request ** aSRpnt, int forward) +{ + int result; + char * name = tape_name(STp); + +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Stepping over filemark %s.\n", + name, forward ? "forward" : "backward"); +#endif + + if (forward) { + /* assumes that the filemark is already read by the drive, so this is low cost */ + result = osst_space_over_filemarks_forward_slow(STp, aSRpnt, MTFSF, 1); + } + else + /* assumes this is only called if we just read the filemark! */ + result = osst_seek_logical_blk(STp, aSRpnt, STp->logical_blk_num - 1); + + if (result < 0) + printk(KERN_WARNING "%s:W: Stepping over filemark %s failed.\n", + name, forward ? "forward" : "backward"); + + return result; +} + + +/* Get the tape position. */ + +static int osst_get_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt) +{ + unsigned char scmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + int result = 0; + char * name = tape_name(STp); + + /* KG: We want to be able to use it for checking Write Buffer availability + * and thus don't want to risk to overwrite anything. Exchange buffers ... */ + char mybuf[24]; + char * olddata = STp->buffer->b_data; + int oldsize = STp->buffer->buffer_size; + + if (STp->ready != ST_READY) return (-EIO); + + memset (scmd, 0, MAX_COMMAND_SIZE); + scmd[0] = READ_POSITION; + + STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24; + SRpnt = osst_do_scsi(*aSRpnt, STp, scmd, 20, DMA_FROM_DEVICE, + STp->timeout, MAX_RETRIES, 1); + if (!SRpnt) { + STp->buffer->b_data = olddata; STp->buffer->buffer_size = oldsize; + return (-EBUSY); + } + *aSRpnt = SRpnt; + + if (STp->buffer->syscall_result) + result = ((SRpnt->sr_sense_buffer[2] & 0x0f) == 3) ? -EIO : -EINVAL; /* 3: Write Error */ + + if (result == -EINVAL) + printk(KERN_ERR "%s:E: Can't read tape position.\n", name); + else { + if (result == -EIO) { /* re-read position - this needs to preserve media errors */ + unsigned char mysense[16]; + memcpy (mysense, SRpnt->sr_sense_buffer, 16); + memset (scmd, 0, MAX_COMMAND_SIZE); + scmd[0] = READ_POSITION; + STp->buffer->b_data = mybuf; STp->buffer->buffer_size = 24; + SRpnt = osst_do_scsi(SRpnt, STp, scmd, 20, DMA_FROM_DEVICE, + STp->timeout, MAX_RETRIES, 1); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reread position, reason=[%02x:%02x:%02x], result=[%s%02x:%02x:%02x]\n", + name, mysense[2], mysense[12], mysense[13], STp->buffer->syscall_result?"":"ok:", + SRpnt->sr_sense_buffer[2],SRpnt->sr_sense_buffer[12],SRpnt->sr_sense_buffer[13]); +#endif + if (!STp->buffer->syscall_result) + memcpy (SRpnt->sr_sense_buffer, mysense, 16); + else + printk(KERN_WARNING "%s:W: Double error in get position\n", name); + } + STp->first_frame_position = ((STp->buffer)->b_data[4] << 24) + + ((STp->buffer)->b_data[5] << 16) + + ((STp->buffer)->b_data[6] << 8) + + (STp->buffer)->b_data[7]; + STp->last_frame_position = ((STp->buffer)->b_data[ 8] << 24) + + ((STp->buffer)->b_data[ 9] << 16) + + ((STp->buffer)->b_data[10] << 8) + + (STp->buffer)->b_data[11]; + STp->cur_frames = (STp->buffer)->b_data[15]; +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG "%s:D: Drive Positions: host %d, tape %d%s, buffer %d\n", name, + STp->first_frame_position, STp->last_frame_position, + ((STp->buffer)->b_data[0]&0x80)?" (BOP)": + ((STp->buffer)->b_data[0]&0x40)?" (EOP)":"", + STp->cur_frames); + } +#endif + if (STp->cur_frames == 0 && STp->first_frame_position != STp->last_frame_position) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Correcting read position %d, %d, %d\n", name, + STp->first_frame_position, STp->last_frame_position, STp->cur_frames); +#endif + STp->first_frame_position = STp->last_frame_position; + } + } + STp->buffer->b_data = olddata; STp->buffer->buffer_size = oldsize; + + return (result == 0 ? STp->first_frame_position : result); +} + + +/* Set the tape block */ +static int osst_set_frame_position(struct osst_tape *STp, struct scsi_request ** aSRpnt, int ppos, int skip) +{ + unsigned char scmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + struct st_partstat * STps; + int result = 0; + int pp = (ppos == 3000 && !skip)? 0 : ppos; + char * name = tape_name(STp); + + if (STp->ready != ST_READY) return (-EIO); + + STps = &(STp->ps[STp->partition]); + + if (ppos < 0 || ppos > STp->capacity) { + printk(KERN_WARNING "%s:W: Reposition request %d out of range\n", name, ppos); + pp = ppos = ppos < 0 ? 0 : (STp->capacity - 1); + result = (-EINVAL); + } + + do { +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Setting ppos to %d.\n", name, pp); +#endif + memset (scmd, 0, MAX_COMMAND_SIZE); + scmd[0] = SEEK_10; + scmd[1] = 1; + scmd[3] = (pp >> 24); + scmd[4] = (pp >> 16); + scmd[5] = (pp >> 8); + scmd[6] = pp; + if (skip) + scmd[9] = 0x80; + + SRpnt = osst_do_scsi(*aSRpnt, STp, scmd, 0, DMA_NONE, STp->long_timeout, + MAX_RETRIES, 1); + if (!SRpnt) + return (-EBUSY); + *aSRpnt = SRpnt; + + if ((STp->buffer)->syscall_result != 0) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: SEEK command from %d to %d failed.\n", + name, STp->first_frame_position, pp); +#endif + result = (-EIO); + } + if (pp != ppos) + osst_wait_ready(STp, aSRpnt, 5 * 60, OSST_WAIT_POSITION_COMPLETE); + } while ((pp != ppos) && (pp = ppos)); + STp->first_frame_position = STp->last_frame_position = ppos; + STps->eof = ST_NOEOF; + STps->at_sm = 0; + STps->rw = ST_IDLE; + STp->frame_in_buffer = 0; + return result; +} + +static int osst_write_trailer(struct osst_tape *STp, struct scsi_request ** aSRpnt, int leave_at_EOT) +{ + struct st_partstat * STps = &(STp->ps[STp->partition]); + int result = 0; + + if (STp->write_type != OS_WRITE_NEW_MARK) { + /* true unless the user wrote the filemark for us */ + result = osst_flush_drive_buffer(STp, aSRpnt); + if (result < 0) goto out; + result = osst_write_filemark(STp, aSRpnt); + if (result < 0) goto out; + + if (STps->drv_file >= 0) + STps->drv_file++ ; + STps->drv_block = 0; + } + result = osst_write_eod(STp, aSRpnt); + osst_write_header(STp, aSRpnt, leave_at_EOT); + + STps->eof = ST_FM; +out: + return result; +} + +/* osst versions of st functions - augmented and stripped to suit OnStream only */ + +/* Flush the write buffer (never need to write if variable blocksize). */ +static int osst_flush_write_buffer(struct osst_tape *STp, struct scsi_request ** aSRpnt) +{ + int offset, transfer, blks = 0; + int result = 0; + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt = *aSRpnt; + struct st_partstat * STps; + char * name = tape_name(STp); + + if ((STp->buffer)->writing) { + if (SRpnt == (STp->buffer)->last_SRpnt) +#if DEBUG + { printk(OSST_DEB_MSG + "%s:D: aSRpnt points to scsi_request that write_behind_check will release -- cleared\n", name); +#endif + *aSRpnt = SRpnt = NULL; +#if DEBUG + } else if (SRpnt) + printk(OSST_DEB_MSG + "%s:D: aSRpnt does not point to scsi_request that write_behind_check will release -- strange\n", name); +#endif + osst_write_behind_check(STp); + if ((STp->buffer)->syscall_result) { +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Async write error (flush) %x.\n", + name, (STp->buffer)->midlevel_result); +#endif + if ((STp->buffer)->midlevel_result == INT_MAX) + return (-ENOSPC); + return (-EIO); + } + } + + result = 0; + if (STp->dirty == 1) { + + STp->write_count++; + STps = &(STp->ps[STp->partition]); + STps->rw = ST_WRITING; + offset = STp->buffer->buffer_bytes; + blks = (offset + STp->block_size - 1) / STp->block_size; + transfer = OS_FRAME_SIZE; + + if (offset < OS_DATA_SIZE) + osst_zero_buffer_tail(STp->buffer); + + if (STp->poll) + if (osst_wait_frame (STp, aSRpnt, STp->first_frame_position, -50, 120)) + result = osst_recover_wait_frame(STp, aSRpnt, 1); + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_6; + cmd[1] = 1; + cmd[4] = 1; + + switch (STp->write_type) { + case OS_WRITE_DATA: +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Writing %d blocks to frame %d, lblks %d-%d\n", + name, blks, STp->frame_seq_number, + STp->logical_blk_num - blks, STp->logical_blk_num - 1); +#endif + osst_init_aux(STp, OS_FRAME_TYPE_DATA, STp->frame_seq_number++, + STp->logical_blk_num - blks, STp->block_size, blks); + break; + case OS_WRITE_EOD: + osst_init_aux(STp, OS_FRAME_TYPE_EOD, STp->frame_seq_number++, + STp->logical_blk_num, 0, 0); + break; + case OS_WRITE_NEW_MARK: + osst_init_aux(STp, OS_FRAME_TYPE_MARKER, STp->frame_seq_number++, + STp->logical_blk_num++, 0, blks=1); + break; + case OS_WRITE_HEADER: + osst_init_aux(STp, OS_FRAME_TYPE_HEADER, 0, 0, 0, blks=0); + break; + default: /* probably FILLER */ + osst_init_aux(STp, OS_FRAME_TYPE_FILL, 0, 0, 0, 0); + } +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Flushing %d bytes, Transfering %d bytes in %d lblocks.\n", + name, offset, transfer, blks); +#endif + + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, transfer, DMA_TO_DEVICE, + STp->timeout, MAX_RETRIES, 1); + *aSRpnt = SRpnt; + if (!SRpnt) + return (-EBUSY); + + if ((STp->buffer)->syscall_result != 0) { +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: write sense [0]=0x%02x [2]=%02x [12]=%02x [13]=%02x\n", + name, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2], + SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]); +#endif + if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 && + (SRpnt->sr_sense_buffer[2] & 0x40) && /* FIXME - SC-30 drive doesn't assert EOM bit */ + (SRpnt->sr_sense_buffer[2] & 0x0f) == NO_SENSE) { + STp->dirty = 0; + (STp->buffer)->buffer_bytes = 0; + result = (-ENOSPC); + } + else { + if (osst_write_error_recovery(STp, aSRpnt, 1)) { + printk(KERN_ERR "%s:E: Error on flush write.\n", name); + result = (-EIO); + } + } + STps->drv_block = (-1); /* FIXME - even if write recovery succeeds? */ + } + else { + STp->first_frame_position++; + STp->dirty = 0; + (STp->buffer)->buffer_bytes = 0; + } + } +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Exit flush write buffer with code %d\n", name, result); +#endif + return result; +} + + +/* Flush the tape buffer. The tape will be positioned correctly unless + seek_next is true. */ +static int osst_flush_buffer(struct osst_tape * STp, struct scsi_request ** aSRpnt, int seek_next) +{ + struct st_partstat * STps; + int backspace = 0, result = 0; +#if DEBUG + char * name = tape_name(STp); +#endif + + /* + * If there was a bus reset, block further access + * to this device. + */ + if( STp->pos_unknown) + return (-EIO); + + if (STp->ready != ST_READY) + return 0; + + STps = &(STp->ps[STp->partition]); + if (STps->rw == ST_WRITING || STp->dirty) { /* Writing */ + STp->write_type = OS_WRITE_DATA; + return osst_flush_write_buffer(STp, aSRpnt); + } + if (STp->block_size == 0) + return 0; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reached flush (read) buffer\n", name); +#endif + + if (!STp->can_bsr) { + 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; + STp->frame_in_buffer = 0; /* FIXME is this relevant w. OSST? */ + } + + if (!seek_next) { + if (STps->eof == ST_FM_HIT) { + result = cross_eof(STp, aSRpnt, 0); /* 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) /* TODO -- design and run a test case for this */ + result = osst_seek_logical_blk(STp, aSRpnt, STp->logical_blk_num - 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; +} + +static int osst_write_frame(struct osst_tape * STp, struct scsi_request ** aSRpnt, int synchronous) +{ + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt; + int blks; +#if DEBUG + char * name = tape_name(STp); +#endif + + if ((!STp-> raw) && (STp->first_frame_position == 0xbae)) { /* _must_ preserve buffer! */ +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Reaching config partition.\n", name); +#endif + if (osst_flush_drive_buffer(STp, aSRpnt) < 0) { + return (-EIO); + } + /* error recovery may have bumped us past the header partition */ + if (osst_get_frame_position(STp, aSRpnt) < 0xbb8) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Skipping over config partition.\n", name); +#endif + osst_position_tape_and_confirm(STp, aSRpnt, 0xbb8); + } + } + + if (STp->poll) + if (osst_wait_frame (STp, aSRpnt, STp->first_frame_position, -48, 120)) + if (osst_recover_wait_frame(STp, aSRpnt, 1)) + return (-EIO); + +// osst_build_stats(STp, &SRpnt); + + STp->ps[STp->partition].rw = ST_WRITING; + STp->write_type = OS_WRITE_DATA; + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = WRITE_6; + cmd[1] = 1; + cmd[4] = 1; /* one frame at a time... */ + blks = STp->buffer->buffer_bytes / STp->block_size; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Writing %d blocks to frame %d, lblks %d-%d\n", name, blks, + STp->frame_seq_number, STp->logical_blk_num - blks, STp->logical_blk_num - 1); +#endif + osst_init_aux(STp, OS_FRAME_TYPE_DATA, STp->frame_seq_number++, + STp->logical_blk_num - blks, STp->block_size, blks); + +#if DEBUG + if (!synchronous) + STp->write_pending = 1; +#endif + SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, DMA_TO_DEVICE, STp->timeout, + MAX_RETRIES, synchronous); + if (!SRpnt) + return (-EBUSY); + *aSRpnt = SRpnt; + + if (synchronous) { + if (STp->buffer->syscall_result != 0) { +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Error on write:\n", name); +#endif + if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 && + (SRpnt->sr_sense_buffer[2] & 0x40)) { + if ((SRpnt->sr_sense_buffer[2] & 0x0f) == VOLUME_OVERFLOW) + return (-ENOSPC); + } + else { + if (osst_write_error_recovery(STp, aSRpnt, 1)) + return (-EIO); + } + } + else + STp->first_frame_position++; + } + + STp->write_count++; + + return 0; +} + +/* Lock or unlock the drive door. Don't use when struct scsi_request allocated. */ +static int do_door_lock(struct osst_tape * STp, int do_lock) +{ + int retval, cmd; + + cmd = do_lock ? SCSI_IOCTL_DOORLOCK : SCSI_IOCTL_DOORUNLOCK; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: %socking drive door.\n", tape_name(STp), do_lock ? "L" : "Unl"); +#endif + retval = scsi_ioctl(STp->device, cmd, NULL); + if (!retval) { + STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; + } + else { + STp->door_locked = ST_LOCK_FAILS; + } + return retval; +} + +/* Set the internal state after reset */ +static void reset_state(struct osst_tape *STp) +{ + int i; + struct st_partstat *STps; + + STp->pos_unknown = 0; + 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 = 0; + STps->drv_block = -1; + STps->drv_file = -1; + } +} + + +/* Entry points to osst */ + +/* Write command */ +static ssize_t osst_write(struct file * filp, const char __user * buf, size_t count, loff_t *ppos) +{ + ssize_t total, retval = 0; + ssize_t i, do_count, blks, transfer; + int write_threshold; + int doing_write = 0; + const char __user * b_point; + struct scsi_request * SRpnt = NULL; + struct st_modedef * STm; + struct st_partstat * STps; + struct osst_tape * STp = filp->private_data; + char * name = tape_name(STp); + + + if (down_interruptible(&STp->lock)) + return (-ERESTARTSYS); + + /* + * 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) ) { + retval = (-ENXIO); + goto out; + } + + if (STp->ready != ST_READY) { + if (STp->ready == ST_NO_TAPE) + retval = (-ENOMEDIUM); + else + retval = (-EIO); + goto out; + } + STm = &(STp->modes[STp->current_mode]); + if (!STm->defined) { + retval = (-ENXIO); + goto out; + } + if (count == 0) + goto out; + + /* + * If there was a bus reset, block further access + * to this device. + */ + if (STp->pos_unknown) { + retval = (-EIO); + goto out; + } + +#if DEBUG + if (!STp->in_use) { + printk(OSST_DEB_MSG "%s:D: Incorrect device.\n", name); + retval = (-EIO); + goto out; + } +#endif + + if (STp->write_prot) { + retval = (-EACCES); + goto out; + } + + /* Write must be integral number of blocks */ + if (STp->block_size != 0 && (count % STp->block_size) != 0) { + printk(KERN_ERR "%s:E: Write (%Zd bytes) not multiple of tape block size (%d%c).\n", + name, count, STp->block_size<1024? + STp->block_size:STp->block_size/1024, STp->block_size<1024?'b':'k'); + retval = (-EINVAL); + goto out; + } + + if (STp->first_frame_position >= STp->capacity - OSST_EOM_RESERVE) { + printk(KERN_ERR "%s:E: Write truncated at EOM early warning (frame %d).\n", + name, STp->first_frame_position); + retval = (-ENOSPC); + goto out; + } + + if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && !do_door_lock(STp, 1)) + STp->door_locked = ST_LOCKED_AUTO; + + STps = &(STp->ps[STp->partition]); + + if (STps->rw == ST_READING) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Switching from read to write at file %d, block %d\n", name, + STps->drv_file, STps->drv_block); +#endif + retval = osst_flush_buffer(STp, &SRpnt, 0); + if (retval) + goto out; + STps->rw = ST_IDLE; + } + if (STps->rw != ST_WRITING) { + /* Are we totally rewriting this tape? */ + if (!STp->header_ok || + (STp->first_frame_position == STp->first_data_ppos && STps->drv_block < 0) || + (STps->drv_file == 0 && STps->drv_block == 0)) { + STp->wrt_pass_cntr++; +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Allocating next write pass counter: %d\n", + name, STp->wrt_pass_cntr); +#endif + osst_reset_header(STp, &SRpnt); + STps->drv_file = STps->drv_block = 0; + } + /* Do we know where we'll be writing on the tape? */ + else { + if ((STp->fast_open && osst_verify_position(STp, &SRpnt)) || + STps->drv_file < 0 || STps->drv_block < 0) { + if (STp->first_frame_position == STp->eod_frame_ppos) { /* at EOD */ + STps->drv_file = STp->filemark_cnt; + STps->drv_block = 0; + } + else { + /* We have no idea where the tape is positioned - give up */ +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: Cannot write at indeterminate position.\n", name); +#endif + retval = (-EIO); + goto out; + } + } + if ((STps->drv_file + STps->drv_block) > 0 && STps->drv_file < STp->filemark_cnt) { + STp->filemark_cnt = STps->drv_file; + STp->last_mark_ppos = + ntohl(STp->header_cache->dat_fm_tab.fm_tab_ent[STp->filemark_cnt-1]); + printk(KERN_WARNING + "%s:W: Overwriting file %d with old write pass counter %d\n", + name, STps->drv_file, STp->wrt_pass_cntr); + printk(KERN_WARNING + "%s:W: may lead to stale data being accepted on reading back!\n", + name); +#if DEBUG + printk(OSST_DEB_MSG + "%s:D: resetting filemark count to %d and last mark ppos,lbn to %d,%d\n", + name, STp->filemark_cnt, STp->last_mark_ppos, STp->last_mark_lbn); +#endif + } + } + STp->fast_open = 0; + } + if (!STp->header_ok) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Write cannot proceed without valid headers\n", name); +#endif + retval = (-EIO); + goto out; + } + + if ((STp->buffer)->writing) { +if (SRpnt) printk(KERN_ERR "%s:A: Not supposed to have SRpnt at line %d\n", name, __LINE__); + osst_write_behind_check(STp); + if ((STp->buffer)->syscall_result) { +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Async write error (write) %x.\n", name, + (STp->buffer)->midlevel_result); +#endif + if ((STp->buffer)->midlevel_result == INT_MAX) + STps->eof = ST_EOM_OK; + else + STps->eof = ST_EOM_ERROR; + } + } + if (STps->eof == ST_EOM_OK) { + retval = (-ENOSPC); + goto out; + } + else if (STps->eof == ST_EOM_ERROR) { + retval = (-EIO); + goto out; + } + + /* Check the buffer readability in cases where copy_user might catch + the problems after some tape movement. */ + if ((copy_from_user(&i, buf, 1) != 0 || + copy_from_user(&i, buf + count - 1, 1) != 0)) { + retval = (-EFAULT); + goto out; + } + + if (!STm->do_buffer_writes) { + write_threshold = 1; + } + else + write_threshold = (STp->buffer)->buffer_blocks * STp->block_size; + if (!STm->do_async_writes) + write_threshold--; + + total = count; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Writing %d bytes to file %d block %d lblk %d fseq %d fppos %d\n", + name, count, STps->drv_file, STps->drv_block, + STp->logical_blk_num, STp->frame_seq_number, STp->first_frame_position); +#endif + b_point = buf; + while ((STp->buffer)->buffer_bytes + count > write_threshold) + { + doing_write = 1; + 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) { + retval = i; + goto out; + } + + blks = do_count / STp->block_size; + STp->logical_blk_num += blks; /* logical_blk_num is incremented as data is moved from user */ + + i = osst_write_frame(STp, &SRpnt, 1); + + if (i == (-ENOSPC)) { + transfer = STp->buffer->writing; /* FIXME -- check this logic */ + if (transfer <= do_count) { + filp->f_pos += do_count - transfer; + count -= do_count - transfer; + if (STps->drv_block >= 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(OSST_DEB_MSG "%s:D: EOM with %d bytes unwritten.\n", + name, 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(OSST_DEB_MSG "%s:D: EOM with lost data.\n", name); +#endif + } + } + else + retval = i; + + if (retval < 0) { + if (SRpnt != NULL) { + scsi_release_request(SRpnt); + SRpnt = NULL; + } + STp->buffer->buffer_bytes = 0; + STp->dirty = 0; + if (count < total) + retval = total - count; + goto out; + } + + filp->f_pos += do_count; + b_point += do_count; + count -= do_count; + if (STps->drv_block >= 0) { + STps->drv_block += blks; + } + STp->buffer->buffer_bytes = 0; + STp->dirty = 0; + } /* end while write threshold exceeded */ + + if (count != 0) { + STp->dirty = 1; + i = append_to_buffer(b_point, STp->buffer, count); + if (i) { + retval = i; + goto out; + } + blks = count / STp->block_size; + STp->logical_blk_num += blks; + if (STps->drv_block >= 0) { + STps->drv_block += blks; + } + filp->f_pos += count; + count = 0; + } + + if (doing_write && (STp->buffer)->syscall_result != 0) { + retval = (STp->buffer)->syscall_result; + goto out; + } + + if (STm->do_async_writes && ((STp->buffer)->buffer_bytes >= STp->write_threshold)) { + /* Schedule an asynchronous write */ + (STp->buffer)->writing = ((STp->buffer)->buffer_bytes / + STp->block_size) * STp->block_size; + STp->dirty = !((STp->buffer)->writing == + (STp->buffer)->buffer_bytes); + + i = osst_write_frame(STp, &SRpnt, 0); + if (i < 0) { + retval = (-EIO); + goto out; + } + SRpnt = NULL; /* Prevent releasing this request! */ + } + STps->at_sm &= (total == 0); + if (total > 0) + STps->eof = ST_NOEOF; + + retval = total; + +out: + if (SRpnt != NULL) scsi_release_request(SRpnt); + + up(&STp->lock); + + return retval; +} + + +/* Read command */ +static ssize_t osst_read(struct file * filp, char __user * buf, size_t count, loff_t *ppos) +{ + ssize_t total, retval = 0; + ssize_t i, transfer; + int special; + struct st_modedef * STm; + struct st_partstat * STps; + struct scsi_request * SRpnt = NULL; + struct osst_tape * STp = filp->private_data; + char * name = tape_name(STp); + + + if (down_interruptible(&STp->lock)) + return (-ERESTARTSYS); + + /* + * 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) ) { + retval = (-ENXIO); + goto out; + } + + if (STp->ready != ST_READY) { + if (STp->ready == ST_NO_TAPE) + retval = (-ENOMEDIUM); + else + retval = (-EIO); + goto out; + } + STm = &(STp->modes[STp->current_mode]); + if (!STm->defined) { + retval = (-ENXIO); + goto out; + } +#if DEBUG + if (!STp->in_use) { + printk(OSST_DEB_MSG "%s:D: Incorrect device.\n", name); + retval = (-EIO); + goto out; + } +#endif + /* Must have initialized medium */ + if (!STp->header_ok) { + retval = (-EIO); + goto out; + } + + if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && !do_door_lock(STp, 1)) + STp->door_locked = ST_LOCKED_AUTO; + + STps = &(STp->ps[STp->partition]); + if (STps->rw == ST_WRITING) { + retval = osst_flush_buffer(STp, &SRpnt, 0); + if (retval) + goto out; + STps->rw = ST_IDLE; + /* FIXME -- this may leave the tape without EOD and up2date headers */ + } + + if ((count % STp->block_size) != 0) { + printk(KERN_WARNING + "%s:W: Read (%Zd bytes) not multiple of tape block size (%d%c).\n", name, count, + STp->block_size<1024?STp->block_size:STp->block_size/1024, STp->block_size<1024?'b':'k'); + } + +#if DEBUG + if (debugging && STps->eof != ST_NOEOF) + printk(OSST_DEB_MSG "%s:D: EOF/EOM flag up (%d). Bytes %d\n", name, + 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; + retval = 0; + goto out; + } + retval = (-EIO); /* EOM or Blank Check */ + goto out; + } + + /* 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) { + retval = (-EFAULT); + goto out; + } + + /* Loop until enough data in buffer or a special condition found */ + for (total = 0, special = 0; total < count - STp->block_size + 1 && !special; ) { + + /* Get new data if the buffer is empty */ + if ((STp->buffer)->buffer_bytes == 0) { + if (STps->eof == ST_FM_HIT) + break; + special = osst_get_logical_frame(STp, &SRpnt, STp->frame_seq_number, 0); + if (special < 0) { /* No need to continue read */ + STp->frame_in_buffer = 0; + retval = special; + goto out; + } + } + + /* Move the data from driver buffer to user buffer */ + if ((STp->buffer)->buffer_bytes > 0) { +#if DEBUG + if (debugging && STps->eof != ST_NOEOF) + printk(OSST_DEB_MSG "%s:D: EOF up (%d). Left %d, needed %d.\n", name, + STps->eof, (STp->buffer)->buffer_bytes, count - total); +#endif + /* force multiple of block size, note block_size may have been adjusted */ + transfer = (((STp->buffer)->buffer_bytes < count - total ? + (STp->buffer)->buffer_bytes : count - total)/ + STp->block_size) * STp->block_size; + + if (transfer == 0) { + printk(KERN_WARNING + "%s:W: Nothing can be transfered, requested %Zd, tape block size (%d%c).\n", + name, count, STp->block_size < 1024? + STp->block_size:STp->block_size/1024, + STp->block_size<1024?'b':'k'); + break; + } + i = from_buffer(STp->buffer, buf, transfer); + if (i) { + retval = i; + goto out; + } + STp->logical_blk_num += transfer / STp->block_size; + STps->drv_block += transfer / STp->block_size; + filp->f_pos += transfer; + buf += transfer; + total += transfer; + } + + if ((STp->buffer)->buffer_bytes == 0) { +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Finished with frame %d\n", + name, STp->frame_seq_number); +#endif + STp->frame_in_buffer = 0; + STp->frame_seq_number++; /* frame to look for next time */ + } + } /* for (total = 0, special = 0; total < count && !special; ) */ + + /* Change the eof state if no data from tape or buffer */ + if (total == 0) { + if (STps->eof == ST_FM_HIT) { + STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD_2: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; + if (STps->drv_block > 0 && STps->drv_file >= 0) + STps->drv_file++; + STps->drv_block = 0; + } + else if (STps->eof == ST_EOD_2) + STps->eof = ST_EOD; + } + else if (STps->eof == ST_FM) + STps->eof = ST_NOEOF; + + retval = total; + +out: + if (SRpnt != NULL) scsi_release_request(SRpnt); + + up(&STp->lock); + + return retval; +} + + +/* Set the driver options */ +static void osst_log_options(struct osst_tape *STp, struct st_modedef *STm, char *name) +{ + printk(KERN_INFO +"%s:I: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n", + name, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes, + STm->do_read_ahead); + printk(KERN_INFO +"%s:I: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n", + name, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock); + printk(KERN_INFO +"%s:I: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n", + name, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions, + STp->scsi2_logical); + printk(KERN_INFO +"%s:I: sysv: %d\n", name, STm->sysv); +#if DEBUG + printk(KERN_INFO + "%s:D: debugging: %d\n", + name, debugging); +#endif +} + + +static int osst_set_options(struct osst_tape *STp, long options) +{ + int value; + long code; + struct st_modedef * STm; + char * name = tape_name(STp); + + STm = &(STp->modes[STp->current_mode]); + if (!STm->defined) { + memcpy(STm, &(STp->modes[0]), sizeof(*STm)); + modes_defined = 1; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Initialized mode %d definition from mode 0\n", + name, 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 + osst_log_options(STp, STm, name); + } + 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 + osst_log_options(STp, STm, name); + } + else if (code == MT_ST_WRITE_THRESHOLD) { + value = (options & ~MT_ST_OPTIONS) * ST_KILOBYTE; + if (value < 1 || value > osst_buffer_size) { + printk(KERN_WARNING "%s:W: Write threshold %d too small or too large.\n", + name, value); + return (-EIO); + } + STp->write_threshold = value; + printk(KERN_INFO "%s:I: Write threshold set to %d bytes.\n", + name, 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 "%s:I: Default block size disabled.\n", name); + } + else { + if (value < 512 || value > OS_DATA_SIZE || OS_DATA_SIZE % value) { + printk(KERN_WARNING "%s:W: Default block size cannot be set to %d.\n", + name, value); + return (-EINVAL); + } + STm->default_blksize = value; + printk(KERN_INFO "%s:I: Default block size set to %d bytes.\n", + name, 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 "%s:I: Long timeout set to %d seconds.\n", name, + (value & ~MT_ST_SET_LONG_TIMEOUT)); + } + else { + STp->timeout = value * HZ; + printk(KERN_INFO "%s:I: Normal timeout set to %d seconds.\n", name, 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 "%s:I: Density default disabled.\n", name); + } + else { + STm->default_density = value & 0xff; + printk(KERN_INFO "%s:I: Density default set to %x\n", + name, STm->default_density); + } + } + else if (code == MT_ST_DEF_DRVBUFFER) { + if (value == MT_ST_CLEAR_DEFAULT) { + STp->default_drvbuffer = 0xff; + printk(KERN_INFO "%s:I: Drive buffer default disabled.\n", name); + } + else { + STp->default_drvbuffer = value & 7; + printk(KERN_INFO "%s:I: Drive buffer default set to %x\n", + name, 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 "%s:I: Compression default disabled.\n", name); + } + else { + STm->default_compression = (value & 1 ? ST_YES : ST_NO); + printk(KERN_INFO "%s:I: Compression default set to %x\n", + name, (value & 1)); + } + } + } + else + return (-EIO); + + return 0; +} + + +/* Internal ioctl function */ +static int osst_int_ioctl(struct osst_tape * STp, struct scsi_request ** aSRpnt, + unsigned int cmd_in, unsigned long arg) +{ + int timeout; + long ltmp; + int i, ioctl_result; + int chg_eof = 1; + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt = * aSRpnt; + struct st_partstat * STps; + int fileno, blkno, at_sm, frame_seq_numbr, logical_blk_num; + int datalen = 0, direction = DMA_NONE; + char * name = tape_name(STp); + + 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; + frame_seq_numbr = STp->frame_seq_number; + logical_blk_num = STp->logical_blk_num; + + memset(cmd, 0, MAX_COMMAND_SIZE); + switch (cmd_in) { + case MTFSFM: + chg_eof = 0; /* Changed from the FSF after this */ + case MTFSF: + if (STp->raw) + return (-EIO); + if (STp->linux_media) + ioctl_result = osst_space_over_filemarks_forward_fast(STp, &SRpnt, cmd_in, arg); + else + ioctl_result = osst_space_over_filemarks_forward_slow(STp, &SRpnt, cmd_in, arg); + if (fileno >= 0) + fileno += arg; + blkno = 0; + at_sm &= (arg == 0); + goto os_bypass; + + case MTBSF: + chg_eof = 0; /* Changed from the FSF after this */ + case MTBSFM: + if (STp->raw) + return (-EIO); + ioctl_result = osst_space_over_filemarks_backward(STp, &SRpnt, cmd_in, arg); + if (fileno >= 0) + fileno -= arg; + blkno = (-1); /* We can't know the block number */ + at_sm &= (arg == 0); + goto os_bypass; + + case MTFSR: + case MTBSR: +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Skipping %lu blocks %s from logical block %d\n", + name, arg, cmd_in==MTFSR?"forward":"backward", logical_blk_num); +#endif + if (cmd_in == MTFSR) { + logical_blk_num += arg; + if (blkno >= 0) blkno += arg; + } + else { + logical_blk_num -= arg; + if (blkno >= 0) blkno -= arg; + } + ioctl_result = osst_seek_logical_blk(STp, &SRpnt, logical_blk_num); + fileno = STps->drv_file; + blkno = STps->drv_block; + at_sm &= (arg == 0); + goto os_bypass; + + case MTFSS: + cmd[0] = SPACE; + cmd[1] = 0x04; /* Space Setmarks */ /* FIXME -- OS can't do this? */ + cmd[2] = (arg >> 16); + cmd[3] = (arg >> 8); + cmd[4] = arg; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Spacing tape forward %d setmarks.\n", name, + 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 */ /* FIXME -- OS can't do this? */ + 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(OSST_DEB_MSG "%s:D: Spacing tape backward %ld setmarks.\n", + name, (-ltmp)); + } +#endif + if (arg != 0) { + blkno = fileno = (-1); + at_sm = 1; + } + break; + case MTWEOF: + if ((STps->rw == ST_WRITING || STp->dirty) && !STp->pos_unknown) { + STp->write_type = OS_WRITE_DATA; + ioctl_result = osst_flush_write_buffer(STp, &SRpnt); + } else + ioctl_result = 0; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Writing %ld filemark(s).\n", name, arg); +#endif + for (i=0; i<arg; i++) + ioctl_result |= osst_write_filemark(STp, &SRpnt); + if (fileno >= 0) fileno += arg; + if (blkno >= 0) blkno = 0; + goto os_bypass; + + case MTWSM: + if (STp->write_prot) + return (-EACCES); + if (!STp->raw) + return 0; + cmd[0] = WRITE_FILEMARKS; /* FIXME -- need OS version */ + 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) + printk(OSST_DEB_MSG "%s:D: Writing %d setmark(s).\n", name, + cmd[2] * 65536 + cmd[3] * 256 + cmd[4]); +#endif + if (fileno >= 0) + fileno += arg; + blkno = 0; + at_sm = (cmd_in == MTWSM); + break; + case MTOFFL: + case MTLOAD: + case MTUNLOAD: + case MTRETEN: + cmd[0] = START_STOP; + cmd[1] = 1; /* Don't wait for completion */ + if (cmd_in == MTLOAD) { + if (STp->ready == ST_NO_TAPE) + cmd[4] = 4; /* open tray */ + else + cmd[4] = 1; /* load */ + } + if (cmd_in == MTRETEN) + cmd[4] = 3; /* retension then mount */ + if (cmd_in == MTOFFL) + cmd[4] = 4; /* rewind then eject */ + timeout = STp->timeout; +#if DEBUG + if (debugging) { + switch (cmd_in) { + case MTUNLOAD: + printk(OSST_DEB_MSG "%s:D: Unloading tape.\n", name); + break; + case MTLOAD: + printk(OSST_DEB_MSG "%s:D: Loading tape.\n", name); + break; + case MTRETEN: + printk(OSST_DEB_MSG "%s:D: Retensioning tape.\n", name); + break; + case MTOFFL: + printk(OSST_DEB_MSG "%s:D: Ejecting tape.\n", name); + break; + } + } +#endif + fileno = blkno = at_sm = frame_seq_numbr = logical_blk_num = 0 ; + break; + case MTNOP: +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: No-op on tape.\n", name); +#endif + return 0; /* Should do something ? */ + break; + case MTEOM: +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Spacing to end of recorded medium.\n", name); +#endif + if ((osst_position_tape_and_confirm(STp, &SRpnt, STp->eod_frame_ppos) < 0) || + (osst_get_logical_frame(STp, &SRpnt, -1, 0) < 0)) { + ioctl_result = -EIO; + goto os_bypass; + } + if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_EOD) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: No EOD frame found where expected.\n", name); +#endif + ioctl_result = -EIO; + goto os_bypass; + } + ioctl_result = osst_set_frame_position(STp, &SRpnt, STp->eod_frame_ppos, 0); + fileno = STp->filemark_cnt; + blkno = at_sm = 0; + goto os_bypass; + + case MTERASE: + if (STp->write_prot) + return (-EACCES); + ioctl_result = osst_reset_header(STp, &SRpnt); + i = osst_write_eod(STp, &SRpnt); + if (i < ioctl_result) ioctl_result = i; + i = osst_position_tape_and_confirm(STp, &SRpnt, STp->eod_frame_ppos); + if (i < ioctl_result) ioctl_result = i; + fileno = blkno = at_sm = 0 ; + goto os_bypass; + + case MTREW: + cmd[0] = REZERO_UNIT; /* rewind */ + cmd[1] = 1; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Rewinding tape, Immed=%d.\n", name, cmd[1]); +#endif + fileno = blkno = at_sm = frame_seq_numbr = logical_blk_num = 0 ; + break; + + case MTSETBLK: /* Set block length */ + if ((STps->drv_block == 0 ) && + !STp->dirty && + ((STp->buffer)->buffer_bytes == 0) && + ((arg & MT_ST_BLKSIZE_MASK) >= 512 ) && + ((arg & MT_ST_BLKSIZE_MASK) <= OS_DATA_SIZE) && + !(OS_DATA_SIZE % (arg & MT_ST_BLKSIZE_MASK)) ) { + /* + * Only allowed to change the block size if you opened the + * device at the beginning of a file before writing anything. + * Note, that when reading, changing block_size is futile, + * as the size used when writing overrides it. + */ + STp->block_size = (arg & MT_ST_BLKSIZE_MASK); + printk(KERN_INFO "%s:I: Block size set to %d bytes.\n", + name, STp->block_size); + return 0; + } + case MTSETDENSITY: /* Set tape density */ + case MTSETDRVBUFFER: /* Set drive buffering */ + case SET_DENS_AND_BLK: /* Set density and block size */ + chg_eof = 0; + 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->block_size ) { + printk(KERN_WARNING "%s:W: Illegal to set block size to %d%s.\n", + name, (int)(arg & MT_ST_BLKSIZE_MASK), + (OS_DATA_SIZE % (arg & MT_ST_BLKSIZE_MASK))?"":" now"); + return (-EINVAL); + } + return 0; /* FIXME silently ignore if block size didn't change */ + + default: + return (-ENOSYS); + } + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, datalen, direction, timeout, MAX_RETRIES, 1); + + ioctl_result = (STp->buffer)->syscall_result; + + if (!SRpnt) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Couldn't exec scsi cmd for IOCTL\n", name); +#endif + return ioctl_result; + } + + if (!ioctl_result) { /* SCSI command successful */ + STp->frame_seq_number = frame_seq_numbr; + STp->logical_blk_num = logical_blk_num; + } + +os_bypass: +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: IOCTL (%d) Result=%d\n", name, cmd_in, ioctl_result); +#endif + + if (!ioctl_result) { /* success */ + + if (cmd_in == MTFSFM) { + fileno--; + blkno--; + } + if (cmd_in == MTBSFM) { + fileno++; + blkno++; + } + STps->drv_block = blkno; + STps->drv_file = fileno; + STps->at_sm = at_sm; + + if (cmd_in == MTEOM) + STps->eof = ST_EOD; + else if ((cmd_in == MTFSFM || cmd_in == MTBSF) && STps->eof == ST_FM_HIT) { + ioctl_result = osst_seek_logical_blk(STp, &SRpnt, STp->logical_blk_num-1); + STps->drv_block++; + STp->logical_blk_num++; + STp->frame_seq_number++; + STp->frame_in_buffer = 0; + STp->buffer->read_pointer = 0; + } + else if (cmd_in == MTFSF) + STps->eof = (STp->first_frame_position >= STp->eod_frame_ppos)?ST_EOD: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) { + for (i=0; i < ST_NBR_PARTITIONS; i++) { + STp->ps[i].rw = ST_IDLE; + STp->ps[i].last_block_valid = 0;/* FIXME - where else is this field maintained? */ + } + STp->partition = 0; + } + + if (cmd_in == MTREW) { + ioctl_result = osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos); + if (ioctl_result > 0) + ioctl_result = 0; + } + + } else if (cmd_in == MTBSF || cmd_in == MTBSFM ) { + if (osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos) < 0) + STps->drv_file = STps->drv_block = -1; + else + STps->drv_file = STps->drv_block = 0; + STps->eof = ST_NOEOF; + } else if (cmd_in == MTFSF || cmd_in == MTFSFM) { + if (osst_position_tape_and_confirm(STp, &SRpnt, STp->eod_frame_ppos) < 0) + STps->drv_file = STps->drv_block = -1; + else { + STps->drv_file = STp->filemark_cnt; + STps->drv_block = 0; + } + STps->eof = ST_EOD; + } else if (cmd_in == MTBSR || cmd_in == MTFSR || cmd_in == MTWEOF || cmd_in == MTEOM) { + STps->drv_file = STps->drv_block = (-1); + STps->eof = ST_NOEOF; + STp->header_ok = 0; + } else if (cmd_in == MTERASE) { + STp->header_ok = 0; + } else if (SRpnt) { /* SCSI command was not completely successful. */ + if (SRpnt->sr_sense_buffer[2] & 0x40) { + STps->eof = ST_EOM_OK; + STps->drv_block = 0; + } + if (chg_eof) + STps->eof = ST_NOEOF; + + if ((SRpnt->sr_sense_buffer[2] & 0x0f) == BLANK_CHECK) + STps->eof = ST_EOD; + + if (cmd_in == MTLOAD && osst_wait_for_medium(STp, &SRpnt, 60)) + ioctl_result = osst_wait_ready(STp, &SRpnt, 5 * 60, OSST_WAIT_POSITION_COMPLETE); + } + *aSRpnt = SRpnt; + + return ioctl_result; +} + + +/* Open the device */ +static int os_scsi_tape_open(struct inode * inode, struct file * filp) +{ + unsigned short flags; + int i, b_size, new_session = 0, retval = 0; + unsigned char cmd[MAX_COMMAND_SIZE]; + struct scsi_request * SRpnt = NULL; + struct osst_tape * STp; + struct st_modedef * STm; + struct st_partstat * STps; + char * name; + int dev = TAPE_NR(inode); + int mode = TAPE_MODE(inode); + + /* + * We really want to do nonseekable_open(inode, filp); here, but some + * versions of tar incorrectly call lseek on tapes and bail out if that + * fails. So we disallow pread() and pwrite(), but permit lseeks. + */ + filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); + + write_lock(&os_scsi_tapes_lock); + if (dev >= osst_max_dev || os_scsi_tapes == NULL || + (STp = os_scsi_tapes[dev]) == NULL || !STp->device) { + write_unlock(&os_scsi_tapes_lock); + return (-ENXIO); + } + + name = tape_name(STp); + + if (STp->in_use) { + write_unlock(&os_scsi_tapes_lock); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Device already in use.\n", name); +#endif + return (-EBUSY); + } + if (scsi_device_get(STp->device)) { + write_unlock(&os_scsi_tapes_lock); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Failed scsi_device_get.\n", name); +#endif + return (-ENXIO); + } + filp->private_data = STp; + STp->in_use = 1; + write_unlock(&os_scsi_tapes_lock); + STp->rew_at_close = TAPE_REWIND(inode); + + if( !scsi_block_when_processing_errors(STp->device) ) { + return -ENXIO; + } + + if (mode != STp->current_mode) { +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Mode change from %d to %d.\n", + name, STp->current_mode, mode); +#endif + new_session = 1; + STp->current_mode = mode; + } + STm = &(STp->modes[STp->current_mode]); + + flags = filp->f_flags; + STp->write_prot = ((flags & O_ACCMODE) == O_RDONLY); + + STp->raw = TAPE_IS_RAW(inode); + if (STp->raw) + STp->header_ok = 0; + + /* Allocate data segments for this device's tape buffer */ + if (!enlarge_buffer(STp->buffer, STp->restr_dma)) { + printk(KERN_ERR "%s:E: Unable to allocate memory segments for tape buffer.\n", name); + retval = (-EOVERFLOW); + goto err_out; + } + if (STp->buffer->buffer_size >= OS_FRAME_SIZE) { + for (i = 0, b_size = 0; + (i < STp->buffer->sg_segs) && ((b_size + STp->buffer->sg[i].length) <= OS_DATA_SIZE); + b_size += STp->buffer->sg[i++].length); + STp->buffer->aux = (os_aux_t *) (page_address(STp->buffer->sg[i].page) + OS_DATA_SIZE - b_size); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: b_data points to %p in segment 0 at %p\n", name, + STp->buffer->b_data, page_address(STp->buffer->sg[0].page)); + printk(OSST_DEB_MSG "%s:D: AUX points to %p in segment %d at %p\n", name, + STp->buffer->aux, i, page_address(STp->buffer->sg[i].page)); +#endif + } else { + STp->buffer->aux = NULL; /* this had better never happen! */ + printk(KERN_NOTICE "%s:A: Framesize %d too large for buffer.\n", name, OS_FRAME_SIZE); + retval = (-EIO); + goto err_out; + } + STp->buffer->writing = 0; + STp->buffer->syscall_result = 0; + STp->dirty = 0; + for (i=0; i < ST_NBR_PARTITIONS; i++) { + STps = &(STp->ps[i]); + STps->rw = ST_IDLE; + } + STp->ready = ST_READY; +#if DEBUG + STp->nbr_waits = STp->nbr_finished = 0; +#endif + + memset (cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(NULL, STp, cmd, 0, DMA_NONE, STp->timeout, MAX_RETRIES, 1); + if (!SRpnt) { + retval = (STp->buffer)->syscall_result; /* FIXME - valid? */ + goto err_out; + } + if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 && + (SRpnt->sr_sense_buffer[2] & 0x0f) == NOT_READY && + SRpnt->sr_sense_buffer[12] == 4 ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Unit not ready, cause %x\n", name, SRpnt->sr_sense_buffer[13]); +#endif + if (filp->f_flags & O_NONBLOCK) { + retval = -EAGAIN; + goto err_out; + } + if (SRpnt->sr_sense_buffer[13] == 2) { /* initialize command required (LOAD) */ + memset (cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = START_STOP; + cmd[1] = 1; + cmd[4] = 1; + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, + STp->timeout, MAX_RETRIES, 1); + } + osst_wait_ready(STp, &SRpnt, (SRpnt->sr_sense_buffer[13]==1?15:3) * 60, 0); + } + if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 && + (SRpnt->sr_sense_buffer[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */ +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Unit wants attention\n", name); +#endif + STp->header_ok = 0; + + for (i=0; i < 10; i++) { + + memset (cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, + STp->timeout, MAX_RETRIES, 1); + if ((SRpnt->sr_sense_buffer[0] & 0x70) != 0x70 || + (SRpnt->sr_sense_buffer[2] & 0x0f) != UNIT_ATTENTION) + break; + } + + STp->pos_unknown = 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; /* FIXME - seems to be redundant... */ + STps->eof = ST_NOEOF; + STps->at_sm = 0; + STps->last_block_valid = 0; + STps->drv_block = 0; + STps->drv_file = 0 ; + } + new_session = 1; + STp->recover_count = 0; + STp->abort_count = 0; + } + /* + * if we have valid headers from before, and the drive/tape seem untouched, + * open without reconfiguring and re-reading the headers + */ + if (!STp->buffer->syscall_result && STp->header_ok && + !SRpnt->sr_result && SRpnt->sr_sense_buffer[0] == 0) { + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SENSE; + cmd[1] = 8; + cmd[2] = VENDOR_IDENT_PAGE; + cmd[4] = VENDOR_IDENT_PAGE_LENGTH + MODE_HEADER_LENGTH; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_FROM_DEVICE, STp->timeout, 0, 1); + + if (STp->buffer->syscall_result || + STp->buffer->b_data[MODE_HEADER_LENGTH + 2] != 'L' || + STp->buffer->b_data[MODE_HEADER_LENGTH + 3] != 'I' || + STp->buffer->b_data[MODE_HEADER_LENGTH + 4] != 'N' || + STp->buffer->b_data[MODE_HEADER_LENGTH + 5] != '4' ) { +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Signature was changed to %c%c%c%c\n", name, + STp->buffer->b_data[MODE_HEADER_LENGTH + 2], + STp->buffer->b_data[MODE_HEADER_LENGTH + 3], + STp->buffer->b_data[MODE_HEADER_LENGTH + 4], + STp->buffer->b_data[MODE_HEADER_LENGTH + 5]); +#endif + STp->header_ok = 0; + } + i = STp->first_frame_position; + if (STp->header_ok && i == osst_get_frame_position(STp, &SRpnt)) { + if (STp->door_locked == ST_UNLOCKED) { + if (do_door_lock(STp, 1)) + printk(KERN_INFO "%s:I: Can't lock drive door\n", name); + else + STp->door_locked = ST_LOCKED_AUTO; + } + if (!STp->frame_in_buffer) { + STp->block_size = (STm->default_blksize > 0) ? + STm->default_blksize : OS_DATA_SIZE; + STp->buffer->buffer_bytes = STp->buffer->read_pointer = 0; + } + STp->buffer->buffer_blocks = OS_DATA_SIZE / STp->block_size; + STp->fast_open = 1; + scsi_release_request(SRpnt); + return 0; + } +#if DEBUG + if (i != STp->first_frame_position) + printk(OSST_DEB_MSG "%s:D: Tape position changed from %d to %d\n", + name, i, STp->first_frame_position); +#endif + STp->header_ok = 0; + } + STp->fast_open = 0; + + if ((STp->buffer)->syscall_result != 0 && /* in all error conditions except no medium */ + (SRpnt->sr_sense_buffer[2] != 2 || SRpnt->sr_sense_buffer[12] != 0x3A) ) { + + memset(cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = MODE_SELECT; + cmd[1] = 0x10; + cmd[4] = 4 + MODE_HEADER_LENGTH; + + (STp->buffer)->b_data[0] = cmd[4] - 1; + (STp->buffer)->b_data[1] = 0; /* Medium Type - ignoring */ + (STp->buffer)->b_data[2] = 0; /* Reserved */ + (STp->buffer)->b_data[3] = 0; /* Block Descriptor Length */ + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 0] = 0x3f; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 1] = 1; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 2] = 2; + (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3] = 3; + +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Applying soft reset\n", name); +#endif + SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], DMA_TO_DEVICE, STp->timeout, 0, 1); + + STp->header_ok = 0; + + for (i=0; i < 10; i++) { + + memset (cmd, 0, MAX_COMMAND_SIZE); + cmd[0] = TEST_UNIT_READY; + + SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, + STp->timeout, MAX_RETRIES, 1); + if ((SRpnt->sr_sense_buffer[0] & 0x70) != 0x70 || + (SRpnt->sr_sense_buffer[2] & 0x0f) == NOT_READY) + break; + + if ((SRpnt->sr_sense_buffer[2] & 0x0f) == UNIT_ATTENTION) { + STp->pos_unknown = 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 = 0; + STps->drv_block = 0; + STps->drv_file = 0 ; + } + new_session = 1; + } + } + } + + if (osst_wait_ready(STp, &SRpnt, 15 * 60, 0)) /* FIXME - not allowed with NOBLOCK */ + printk(KERN_INFO "%s:I: Device did not become Ready in open\n", name); + + if ((STp->buffer)->syscall_result != 0) { + if ((STp->device)->scsi_level >= SCSI_2 && + (SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 && + (SRpnt->sr_sense_buffer[2] & 0x0f) == NOT_READY && + SRpnt->sr_sense_buffer[12] == 0x3a) { /* Check ASC */ + STp->ready = ST_NO_TAPE; + } else + STp->ready = ST_NOT_READY; + scsi_release_request(SRpnt); + SRpnt = 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; + return 0; + } + + osst_configure_onstream(STp, &SRpnt); + + STp->block_size = STp->raw ? OS_FRAME_SIZE : ( + (STm->default_blksize > 0) ? STm->default_blksize : OS_DATA_SIZE); + STp->buffer->buffer_blocks = STp->raw ? 1 : OS_DATA_SIZE / STp->block_size; + STp->buffer->buffer_bytes = + STp->buffer->read_pointer = + STp->frame_in_buffer = 0; + +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Block size: %d, frame size: %d, buffer size: %d (%d blocks).\n", + name, STp->block_size, OS_FRAME_SIZE, (STp->buffer)->buffer_size, + (STp->buffer)->buffer_blocks); +#endif + + if (STp->drv_write_prot) { + STp->write_prot = 1; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Write protected\n", name); +#endif + if ((flags & O_ACCMODE) == O_WRONLY || (flags & O_ACCMODE) == O_RDWR) { + retval = (-EROFS); + goto err_out; + } + } + + if (new_session) { /* Change the drive parameters for the new mode */ +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: New Session\n", name); +#endif + STp->density_changed = STp->blksize_changed = 0; + STp->compression_changed = 0; + } + + /* + * properly position the tape and check the ADR headers + */ + if (STp->door_locked == ST_UNLOCKED) { + if (do_door_lock(STp, 1)) + printk(KERN_INFO "%s:I: Can't lock drive door\n", name); + else + STp->door_locked = ST_LOCKED_AUTO; + } + + osst_analyze_headers(STp, &SRpnt); + + scsi_release_request(SRpnt); + SRpnt = NULL; + + return 0; + +err_out: + if (SRpnt != NULL) + scsi_release_request(SRpnt); + normalize_buffer(STp->buffer); + STp->header_ok = 0; + STp->in_use = 0; + scsi_device_put(STp->device); + + return retval; +} + + +/* Flush the tape buffer before close */ +static int os_scsi_tape_flush(struct file * filp) +{ + int result = 0, result2; + struct osst_tape * STp = filp->private_data; + struct st_modedef * STm = &(STp->modes[STp->current_mode]); + struct st_partstat * STps = &(STp->ps[STp->partition]); + struct scsi_request * SRpnt = NULL; + char * name = tape_name(STp); + + if (file_count(filp) > 1) + return 0; + + if ((STps->rw == ST_WRITING || STp->dirty) && !STp->pos_unknown) { + STp->write_type = OS_WRITE_DATA; + result = osst_flush_write_buffer(STp, &SRpnt); + if (result != 0 && result != (-ENOSPC)) + goto out; + } + if ( STps->rw >= ST_WRITING && !STp->pos_unknown) { + +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG "%s:D: File length %ld bytes.\n", + name, (long)(filp->f_pos)); + printk(OSST_DEB_MSG "%s:D: Async write waits %d, finished %d.\n", + name, STp->nbr_waits, STp->nbr_finished); + } +#endif + result = osst_write_trailer(STp, &SRpnt, !(STp->rew_at_close)); +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG "%s:D: Buffer flushed, %d EOF(s) written\n", + name, 1+STp->two_fm); +#endif + } + else if (!STp->rew_at_close) { + STps = &(STp->ps[STp->partition]); + if (!STm->sysv || STps->rw != ST_READING) { + if (STp->can_bsr) + result = osst_flush_buffer(STp, &SRpnt, 0); /* this is the default path */ + else if (STps->eof == ST_FM_HIT) { + result = cross_eof(STp, &SRpnt, 0); + 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, &SRpnt, 1))) || + 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 = osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos); + STps->drv_file = STps->drv_block = STp->frame_seq_number = STp->logical_blk_num = 0; + if (result == 0 && result2 < 0) + result = result2; + } + if (SRpnt) scsi_release_request(SRpnt); + + if (STp->abort_count || STp->recover_count) { + printk(KERN_INFO "%s:I:", name); + if (STp->abort_count) + printk(" %d unrecovered errors", STp->abort_count); + if (STp->recover_count) + printk(" %d recovered errors", STp->recover_count); + if (STp->write_count) + printk(" in %d frames written", STp->write_count); + if (STp->read_count) + printk(" in %d frames read", STp->read_count); + printk("\n"); + STp->recover_count = 0; + STp->abort_count = 0; + } + STp->write_count = 0; + STp->read_count = 0; + + return result; +} + + +/* Close the device and release it */ +static int os_scsi_tape_close(struct inode * inode, struct file * filp) +{ + int result = 0; + struct osst_tape * STp = filp->private_data; + + if (STp->door_locked == ST_LOCKED_AUTO) + do_door_lock(STp, 0); + + if (STp->raw) + STp->header_ok = 0; + + normalize_buffer(STp->buffer); + write_lock(&os_scsi_tapes_lock); + STp->in_use = 0; + write_unlock(&os_scsi_tapes_lock); + + scsi_device_put(STp->device); + + return result; +} + + +/* The ioctl command */ +static int osst_ioctl(struct inode * inode,struct file * file, + unsigned int cmd_in, unsigned long arg) +{ + int i, cmd_nr, cmd_type, retval = 0; + unsigned int blk; + struct st_modedef * STm; + struct st_partstat * STps; + struct scsi_request * SRpnt = NULL; + struct osst_tape * STp = file->private_data; + char * name = tape_name(STp); + void __user * p = (void __user *)arg; + + if (down_interruptible(&STp->lock)) + return -ERESTARTSYS; + +#if DEBUG + if (debugging && !STp->in_use) { + printk(OSST_DEB_MSG "%s:D: Incorrect device.\n", name); + retval = (-EIO); + goto out; + } +#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) ) { + retval = (-ENXIO); + goto out; + } + + cmd_type = _IOC_TYPE(cmd_in); + cmd_nr = _IOC_NR(cmd_in); +#if DEBUG + printk(OSST_DEB_MSG "%s:D: Ioctl %d,%d in %s mode\n", name, + cmd_type, cmd_nr, STp->raw?"raw":"normal"); +#endif + if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { + struct mtop mtc; + int auto_weof = 0; + + if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { + retval = (-EINVAL); + goto out; + } + + i = copy_from_user((char *) &mtc, p, sizeof(struct mtop)); + if (i) { + retval = (-EFAULT); + goto out; + } + + if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { + printk(KERN_WARNING "%s:W: MTSETDRVBUFFER only allowed for root.\n", name); + retval = (-EPERM); + goto out; + } + + if (!STm->defined && (mtc.mt_op != MTSETDRVBUFFER && (mtc.mt_count & MT_ST_OPTIONS) == 0)) { + retval = (-ENXIO); + goto out; + } + + if (!STp->pos_unknown) { + + 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 == MTFSF || mtc.mt_op == MTFSFM || + mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || + mtc.mt_op == MTCOMPRESSION; + } + i = osst_flush_buffer(STp, &SRpnt, i); + if (i < 0) { + retval = i; + goto out; + } + } + 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) { + retval = (-EIO); + goto out; + } + reset_state(STp); + /* remove this when the midlevel properly clears was_reset */ + STp->device->was_reset = 0; + } + + if (mtc.mt_op != MTCOMPRESSION && mtc.mt_op != MTLOCK && + mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && + mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTSETDRVBUFFER && + mtc.mt_op != MTMKPART && mtc.mt_op != MTSETPART && + mtc.mt_op != MTWEOF && mtc.mt_op != MTWSM ) { + + /* + * The user tells us to move to another position on the tape. + * If we were appending to the tape content, that would leave + * the tape without proper end, in that case write EOD and + * update the header to reflect its position. + */ +#if DEBUG + printk(KERN_WARNING "%s:D: auto_weod %s at ffp=%d,efp=%d,fsn=%d,lbn=%d,fn=%d,bn=%d\n", name, + STps->rw >= ST_WRITING ? "write" : STps->rw == ST_READING ? "read" : "idle", + STp->first_frame_position, STp->eod_frame_ppos, STp->frame_seq_number, + STp->logical_blk_num, STps->drv_file, STps->drv_block ); +#endif + if (STps->rw >= ST_WRITING && STp->first_frame_position >= STp->eod_frame_ppos) { + auto_weof = ((STp->write_type != OS_WRITE_NEW_MARK) && + !(mtc.mt_op == MTREW || mtc.mt_op == MTOFFL)); + i = osst_write_trailer(STp, &SRpnt, + !(mtc.mt_op == MTREW || mtc.mt_op == MTOFFL)); +#if DEBUG + printk(KERN_WARNING "%s:D: post trailer xeof=%d,ffp=%d,efp=%d,fsn=%d,lbn=%d,fn=%d,bn=%d\n", + name, auto_weof, STp->first_frame_position, STp->eod_frame_ppos, + STp->frame_seq_number, STp->logical_blk_num, STps->drv_file, STps->drv_block ); +#endif + if (i < 0) { + retval = i; + goto out; + } + } + STps->rw = ST_IDLE; + } + + if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) + do_door_lock(STp, 0); /* Ignore result! */ + + if (mtc.mt_op == MTSETDRVBUFFER && + (mtc.mt_count & MT_ST_OPTIONS) != 0) { + retval = osst_set_options(STp, mtc.mt_count); + goto out; + } + + if (mtc.mt_op == MTSETPART) { + if (mtc.mt_count >= STp->nbr_partitions) + retval = -EINVAL; + else { + STp->new_partition = mtc.mt_count; + retval = 0; + } + goto out; + } + + if (mtc.mt_op == MTMKPART) { + if (!STp->can_partitions) { + retval = (-EINVAL); + goto out; + } + if ((i = osst_int_ioctl(STp, &SRpnt, MTREW, 0)) < 0 /*|| + (i = partition_tape(inode, mtc.mt_count)) < 0*/) { + retval = i; + goto out; + } + 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 = 0; + } + STp->partition = STp->new_partition = 0; + STp->nbr_partitions = 1; /* Bad guess ?-) */ + STps->drv_block = STps->drv_file = 0; + retval = 0; + goto out; + } + + if (mtc.mt_op == MTSEEK) { + if (STp->raw) + i = osst_set_frame_position(STp, &SRpnt, mtc.mt_count, 0); + else + i = osst_seek_sector(STp, &SRpnt, mtc.mt_count); + if (!STp->can_partitions) + STp->ps[0].rw = ST_IDLE; + retval = i; + goto out; + } + + if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { + retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); + goto out; + } + + if (auto_weof) + cross_eof(STp, &SRpnt, 0); + + if (mtc.mt_op == MTCOMPRESSION) + retval = -EINVAL; /* OnStream drives don't have compression hardware */ + else + /* MTBSF MTBSFM MTBSR MTBSS MTEOM MTERASE MTFSF MTFSFB MTFSR MTFSS + * MTLOAD MTOFFL MTRESET MTRETEN MTREW MTUNLOAD MTWEOF MTWSM */ + retval = osst_int_ioctl(STp, &SRpnt, mtc.mt_op, mtc.mt_count); + goto out; + } + + if (!STm->defined) { + retval = (-ENXIO); + goto out; + } + + if ((i = osst_flush_buffer(STp, &SRpnt, 0)) < 0) { + retval = i; + goto out; + } + + if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { + struct mtget mt_status; + + if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { + retval = (-EINVAL); + goto out; + } + + mt_status.mt_type = MT_ISONSTREAM_SC; + mt_status.mt_erreg = STp->recover_erreg << MT_ST_SOFTERR_SHIFT; + 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); + mt_status.mt_blkno = STps->drv_block; + mt_status.mt_fileno = STps->drv_file; + if (STp->block_size != 0) { + if (STps->rw == ST_WRITING) + mt_status.mt_blkno += (STp->buffer)->buffer_bytes / STp->block_size; + else if (STps->rw == ST_READING) + mt_status.mt_blkno -= ((STp->buffer)->buffer_bytes + + STp->block_size - 1) / STp->block_size; + } + + mt_status.mt_gstat = 0; + if (STp->drv_write_prot) + mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); + if (mt_status.mt_blkno == 0) { + if (mt_status.mt_fileno == 0) + mt_status.mt_gstat |= GMT_BOT(0xffffffff); + else + mt_status.mt_gstat |= GMT_EOF(0xffffffff); + } + mt_status.mt_resid = STp->partition; + if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) + mt_status.mt_gstat |= GMT_EOT(0xffffffff); + else if (STps->eof >= ST_EOM_OK) + mt_status.mt_gstat |= GMT_EOD(0xffffffff); + if (STp->density == 1) + mt_status.mt_gstat |= GMT_D_800(0xffffffff); + else if (STp->density == 2) + mt_status.mt_gstat |= GMT_D_1600(0xffffffff); + else if (STp->density == 3) + mt_status.mt_gstat |= GMT_D_6250(0xffffffff); + if (STp->ready == ST_READY) + mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); + if (STp->ready == ST_NO_TAPE) + mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); + if (STps->at_sm) + mt_status.mt_gstat |= GMT_SM(0xffffffff); + if (STm->do_async_writes || (STm->do_buffer_writes && STp->block_size != 0) || + STp->drv_buffer != 0) + mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); + + i = copy_to_user(p, &mt_status, sizeof(struct mtget)); + if (i) { + retval = (-EFAULT); + goto out; + } + + STp->recover_erreg = 0; /* Clear after read */ + retval = 0; + goto out; + } /* End of MTIOCGET */ + + if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { + struct mtpos mt_pos; + + if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { + retval = (-EINVAL); + goto out; + } + if (STp->raw) + blk = osst_get_frame_position(STp, &SRpnt); + else + blk = osst_get_sector(STp, &SRpnt); + if (blk < 0) { + retval = blk; + goto out; + } + mt_pos.mt_blkno = blk; + i = copy_to_user(p, &mt_pos, sizeof(struct mtpos)); + if (i) + retval = -EFAULT; + goto out; + } + if (SRpnt) scsi_release_request(SRpnt); + + up(&STp->lock); + + return scsi_ioctl(STp->device, cmd_in, p); + +out: + if (SRpnt) scsi_release_request(SRpnt); + + up(&STp->lock); + + return retval; +} + +#ifdef CONFIG_COMPAT +static long osst_compat_ioctl(struct file * file, unsigned int cmd_in, unsigned long arg) +{ + struct osst_tape *STp = file->private_data; + struct scsi_device *sdev = STp->device; + int ret = -ENOIOCTLCMD; + if (sdev->host->hostt->compat_ioctl) { + + ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); + + } + return ret; +} +#endif + + + +/* Memory handling routines */ + +/* Try to allocate a new tape buffer skeleton. Caller must not hold os_scsi_tapes_lock */ +static struct osst_buffer * new_tape_buffer( int from_initialization, int need_dma, int max_sg ) +{ + int i, priority; + struct osst_buffer *tb; + + if (from_initialization) + priority = GFP_ATOMIC; + else + priority = GFP_KERNEL; + + i = sizeof(struct osst_buffer) + (osst_max_sg_segs - 1) * sizeof(struct scatterlist); + tb = (struct osst_buffer *)kmalloc(i, priority); + if (!tb) { + printk(KERN_NOTICE "osst :I: Can't allocate new tape buffer.\n"); + return NULL; + } + memset(tb, 0, i); + tb->sg_segs = tb->orig_sg_segs = 0; + tb->use_sg = max_sg; + tb->in_use = 1; + tb->dma = need_dma; + tb->buffer_size = 0; +#if DEBUG + if (debugging) + printk(OSST_DEB_MSG + "osst :D: Allocated tape buffer skeleton (%d bytes, %d segments, dma: %d).\n", + i, max_sg, need_dma); +#endif + return tb; +} + +/* Try to allocate a temporary (while a user has the device open) enlarged tape buffer */ +static int enlarge_buffer(struct osst_buffer *STbuffer, int need_dma) +{ + int segs, nbr, max_segs, b_size, priority, order, got; + + if (STbuffer->buffer_size >= OS_FRAME_SIZE) + return 1; + + if (STbuffer->sg_segs) { + printk(KERN_WARNING "osst :A: Buffer not previously normalized.\n"); + normalize_buffer(STbuffer); + } + /* See how many segments we can use -- need at least two */ + nbr = max_segs = STbuffer->use_sg; + if (nbr <= 2) + return 0; + + priority = GFP_KERNEL /* | __GFP_NOWARN */; + if (need_dma) + priority |= GFP_DMA; + + /* Try to allocate the first segment up to OS_DATA_SIZE and the others + big enough to reach the goal (code assumes no segments in place) */ + for (b_size = OS_DATA_SIZE, order = OSST_FIRST_ORDER; b_size >= PAGE_SIZE; order--, b_size /= 2) { + STbuffer->sg[0].page = alloc_pages(priority, order); + STbuffer->sg[0].offset = 0; + if (STbuffer->sg[0].page != NULL) { + STbuffer->sg[0].length = b_size; + STbuffer->b_data = page_address(STbuffer->sg[0].page); + break; + } + } + if (STbuffer->sg[0].page == NULL) { + printk(KERN_NOTICE "osst :I: Can't allocate tape buffer main segment.\n"); + return 0; + } + /* Got initial segment of 'bsize,order', continue with same size if possible, except for AUX */ + for (segs=STbuffer->sg_segs=1, got=b_size; + segs < max_segs && got < OS_FRAME_SIZE; ) { + STbuffer->sg[segs].page = + alloc_pages(priority, (OS_FRAME_SIZE - got <= PAGE_SIZE) ? 0 : order); + STbuffer->sg[segs].offset = 0; + if (STbuffer->sg[segs].page == NULL) { + if (OS_FRAME_SIZE - got <= (max_segs - segs) * b_size / 2 && order) { + b_size /= 2; /* Large enough for the rest of the buffers */ + order--; + continue; + } + printk(KERN_WARNING "osst :W: Failed to enlarge buffer to %d bytes.\n", + OS_FRAME_SIZE); +#if DEBUG + STbuffer->buffer_size = got; +#endif + normalize_buffer(STbuffer); + return 0; + } + STbuffer->sg[segs].length = (OS_FRAME_SIZE - got <= PAGE_SIZE / 2) ? (OS_FRAME_SIZE - got) : b_size; + got += STbuffer->sg[segs].length; + STbuffer->buffer_size = got; + STbuffer->sg_segs = ++segs; + } +#if DEBUG + if (debugging) { + printk(OSST_DEB_MSG + "osst :D: Expanded tape buffer (%d bytes, %d->%d segments, dma: %d, at: %p).\n", + got, STbuffer->orig_sg_segs, STbuffer->sg_segs, need_dma, STbuffer->b_data); + printk(OSST_DEB_MSG + "osst :D: segment sizes: first %d at %p, last %d bytes at %p.\n", + STbuffer->sg[0].length, page_address(STbuffer->sg[0].page), + STbuffer->sg[segs-1].length, page_address(STbuffer->sg[segs-1].page)); + } +#endif + + return 1; +} + + +/* Release the segments */ +static void normalize_buffer(struct osst_buffer *STbuffer) +{ + int i, order, b_size; + + for (i=0; i < STbuffer->sg_segs; i++) { + + for (b_size = PAGE_SIZE, order = 0; + b_size < STbuffer->sg[i].length; + b_size *= 2, order++); + + __free_pages(STbuffer->sg[i].page, order); + STbuffer->buffer_size -= STbuffer->sg[i].length; + } +#if DEBUG + if (debugging && STbuffer->orig_sg_segs < STbuffer->sg_segs) + printk(OSST_DEB_MSG "osst :D: 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 = 0; +} + + +/* Move data from the user buffer to the tape buffer. Returns zero (success) or + negative error code. */ +static int append_to_buffer(const char __user *ubp, struct osst_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 "osst :A: 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(page_address(st_bp->sg[i].page) + 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 "osst :A: 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(struct osst_buffer *st_bp, char __user *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 "osst :A: 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, page_address(st_bp->sg[i].page) + 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 "osst :A: From_buffer overflow (left %d).\n", do_count); + return (-EIO); + } + return 0; +} + +/* Sets the tail of the buffer after fill point to zero. + Returns zero (success) or negative error code. */ +static int osst_zero_buffer_tail(struct osst_buffer *st_bp) +{ + int i, offset, do_count, cnt; + + 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 "osst :A: Zero_buffer offset overflow.\n"); + return (-EIO); + } + for (do_count = OS_DATA_SIZE - st_bp->buffer_bytes; + 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 ; + memset(page_address(st_bp->sg[i].page) + offset, 0, cnt); + do_count -= cnt; + offset = 0; + } + if (do_count) { /* Should never happen */ + printk(KERN_WARNING "osst :A: Zero_buffer overflow (left %d).\n", do_count); + return (-EIO); + } + return 0; +} + +/* Copy a osst 32K chunk of memory into the buffer. + Returns zero (success) or negative error code. */ +static int osst_copy_to_buffer(struct osst_buffer *st_bp, unsigned char *ptr) +{ + int i, cnt, do_count = OS_DATA_SIZE; + + for (i = 0; i < st_bp->sg_segs && do_count > 0; i++) { + cnt = st_bp->sg[i].length < do_count ? + st_bp->sg[i].length : do_count ; + memcpy(page_address(st_bp->sg[i].page), ptr, cnt); + do_count -= cnt; + ptr += cnt; + } + if (do_count || i != st_bp->sg_segs-1) { /* Should never happen */ + printk(KERN_WARNING "osst :A: Copy_to_buffer overflow (left %d at sg %d).\n", + do_count, i); + return (-EIO); + } + return 0; +} + +/* Copy a osst 32K chunk of memory from the buffer. + Returns zero (success) or negative error code. */ +static int osst_copy_from_buffer(struct osst_buffer *st_bp, unsigned char *ptr) +{ + int i, cnt, do_count = OS_DATA_SIZE; + + for (i = 0; i < st_bp->sg_segs && do_count > 0; i++) { + cnt = st_bp->sg[i].length < do_count ? + st_bp->sg[i].length : do_count ; + memcpy(ptr, page_address(st_bp->sg[i].page), cnt); + do_count -= cnt; + ptr += cnt; + } + if (do_count || i != st_bp->sg_segs-1) { /* Should never happen */ + printk(KERN_WARNING "osst :A: Copy_from_buffer overflow (left %d at sg %d).\n", + do_count, i); + return (-EIO); + } + return 0; +} + + +/* Module housekeeping */ + +static void validate_options (void) +{ + if (max_dev > 0) + osst_max_dev = max_dev; + if (write_threshold_kbs > 0) + osst_write_threshold = write_threshold_kbs * ST_KILOBYTE; + if (osst_write_threshold > osst_buffer_size) + osst_write_threshold = osst_buffer_size; + if (max_sg_segs >= OSST_FIRST_SG) + osst_max_sg_segs = max_sg_segs; +#if DEBUG + printk(OSST_DEB_MSG "osst :D: max tapes %d, write threshold %d, max s/g segs %d.\n", + osst_max_dev, osst_write_threshold, osst_max_sg_segs); +#endif +} + +#ifndef MODULE +/* Set the boot options. Syntax: osst=xxx,yyy,... + where xxx is write threshold in 1024 byte blocks, + and yyy is number of s/g segments to use. */ +static int __init osst_setup (char *str) +{ + int i, ints[5]; + char *stp; + + stp = get_options(str, ARRAY_SIZE(ints), ints); + + if (ints[0] > 0) { + for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) + *parms[i].val = ints[i + 1]; + } else { + while (stp != NULL) { + for (i = 0; i < ARRAY_SIZE(parms); i++) { + int len = strlen(parms[i].name); + if (!strncmp(stp, parms[i].name, len) && + (*(stp + len) == ':' || *(stp + len) == '=')) { + *parms[i].val = + simple_strtoul(stp + len + 1, NULL, 0); + break; + } + } + if (i >= sizeof(parms) / sizeof(struct osst_dev_parm)) + printk(KERN_INFO "osst :I: Illegal parameter in '%s'\n", + stp); + stp = strchr(stp, ','); + if (stp) + stp++; + } + } + + return 1; +} + +__setup("osst=", osst_setup); + +#endif + +static struct file_operations osst_fops = { + .owner = THIS_MODULE, + .read = osst_read, + .write = osst_write, + .ioctl = osst_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = osst_compat_ioctl, +#endif + .open = os_scsi_tape_open, + .flush = os_scsi_tape_flush, + .release = os_scsi_tape_close, +}; + +static int osst_supports(struct scsi_device * SDp) +{ + struct osst_support_data { + char *vendor; + char *model; + char *rev; + char *driver_hint; /* Name of the correct driver, NULL if unknown */ + }; + +static struct osst_support_data support_list[] = { + /* {"XXX", "Yy-", "", NULL}, example */ + SIGS_FROM_OSST, + {NULL, }}; + + struct osst_support_data *rp; + + /* We are willing to drive OnStream SC-x0 as well as the + * * IDE, ParPort, FireWire, USB variants, if accessible by + * * emulation layer (ide-scsi, usb-storage, ...) */ + + for (rp=&(support_list[0]); rp->vendor != NULL; rp++) + if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && + !strncmp(rp->model, SDp->model, strlen(rp->model)) && + !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) + return 1; + return 0; +} + +/* + * sysfs support for osst driver parameter information + */ + +static ssize_t osst_version_show(struct device_driver *ddd, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%s\n", osst_version); +} + +static DRIVER_ATTR(version, S_IRUGO, osst_version_show, NULL); + +static void osst_create_driverfs_files(struct device_driver *driverfs) +{ + driver_create_file(driverfs, &driver_attr_version); +} + +static void osst_remove_driverfs_files(struct device_driver *driverfs) +{ + driver_remove_file(driverfs, &driver_attr_version); +} + +/* + * sysfs support for accessing ADR header information + */ + +static ssize_t osst_adr_rev_show(struct class_device *class_dev, char *buf) +{ + struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev); + ssize_t l = 0; + + if (STp && STp->header_ok && STp->linux_media) + l = snprintf(buf, PAGE_SIZE, "%d.%d\n", STp->header_cache->major_rev, STp->header_cache->minor_rev); + return l; +} + +CLASS_DEVICE_ATTR(ADR_rev, S_IRUGO, osst_adr_rev_show, NULL); + +static ssize_t osst_linux_media_version_show(struct class_device *class_dev, char *buf) +{ + struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev); + ssize_t l = 0; + + if (STp && STp->header_ok && STp->linux_media) + l = snprintf(buf, PAGE_SIZE, "LIN%d\n", STp->linux_media_version); + return l; +} + +CLASS_DEVICE_ATTR(media_version, S_IRUGO, osst_linux_media_version_show, NULL); + +static ssize_t osst_capacity_show(struct class_device *class_dev, char *buf) +{ + struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev); + ssize_t l = 0; + + if (STp && STp->header_ok && STp->linux_media) + l = snprintf(buf, PAGE_SIZE, "%d\n", STp->capacity); + return l; +} + +CLASS_DEVICE_ATTR(capacity, S_IRUGO, osst_capacity_show, NULL); + +static ssize_t osst_first_data_ppos_show(struct class_device *class_dev, char *buf) +{ + struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev); + ssize_t l = 0; + + if (STp && STp->header_ok && STp->linux_media) + l = snprintf(buf, PAGE_SIZE, "%d\n", STp->first_data_ppos); + return l; +} + +CLASS_DEVICE_ATTR(BOT_frame, S_IRUGO, osst_first_data_ppos_show, NULL); + +static ssize_t osst_eod_frame_ppos_show(struct class_device *class_dev, char *buf) +{ + struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev); + ssize_t l = 0; + + if (STp && STp->header_ok && STp->linux_media) + l = snprintf(buf, PAGE_SIZE, "%d\n", STp->eod_frame_ppos); + return l; +} + +CLASS_DEVICE_ATTR(EOD_frame, S_IRUGO, osst_eod_frame_ppos_show, NULL); + +static ssize_t osst_filemark_cnt_show(struct class_device *class_dev, char *buf) +{ + struct osst_tape * STp = (struct osst_tape *) class_get_devdata (class_dev); + ssize_t l = 0; + + if (STp && STp->header_ok && STp->linux_media) + l = snprintf(buf, PAGE_SIZE, "%d\n", STp->filemark_cnt); + return l; +} + +CLASS_DEVICE_ATTR(file_count, S_IRUGO, osst_filemark_cnt_show, NULL); + +static struct class_simple * osst_sysfs_class; + +static int osst_sysfs_valid = 0; + +static void osst_sysfs_init(void) +{ + osst_sysfs_class = class_simple_create(THIS_MODULE, "onstream_tape"); + if ( IS_ERR(osst_sysfs_class) ) + printk(KERN_WARNING "osst :W: Unable to register sysfs class\n"); + else + osst_sysfs_valid = 1; +} + +static void osst_sysfs_add(dev_t dev, struct device *device, struct osst_tape * STp, char * name) +{ + struct class_device *osst_class_member; + + if (!osst_sysfs_valid) return; + + osst_class_member = class_simple_device_add(osst_sysfs_class, dev, device, "%s", name); + if (IS_ERR(osst_class_member)) { + printk(KERN_WARNING "osst :W: Unable to add sysfs class member %s\n", name); + return; + } + class_set_devdata(osst_class_member, STp); + class_device_create_file(osst_class_member, &class_device_attr_ADR_rev); + class_device_create_file(osst_class_member, &class_device_attr_media_version); + class_device_create_file(osst_class_member, &class_device_attr_capacity); + class_device_create_file(osst_class_member, &class_device_attr_BOT_frame); + class_device_create_file(osst_class_member, &class_device_attr_EOD_frame); + class_device_create_file(osst_class_member, &class_device_attr_file_count); +} + +static void osst_sysfs_destroy(dev_t dev) +{ + if (!osst_sysfs_valid) return; + + class_simple_device_remove(dev); +} + +static void osst_sysfs_cleanup(void) +{ + if (osst_sysfs_valid) { + class_simple_destroy(osst_sysfs_class); + osst_sysfs_valid = 0; + } +} + +/* + * osst startup / cleanup code + */ + +static int osst_probe(struct device *dev) +{ + struct scsi_device * SDp = to_scsi_device(dev); + struct osst_tape * tpnt; + struct st_modedef * STm; + struct st_partstat * STps; + struct osst_buffer * buffer; + struct gendisk * drive; + int i, mode, dev_num; + + if (SDp->type != TYPE_TAPE || !osst_supports(SDp)) + return -ENODEV; + + drive = alloc_disk(1); + if (!drive) { + printk(KERN_ERR "osst :E: Out of memory. Device not attached.\n"); + return -ENODEV; + } + + /* if this is the first attach, build the infrastructure */ + write_lock(&os_scsi_tapes_lock); + if (os_scsi_tapes == NULL) { + os_scsi_tapes = + (struct osst_tape **)kmalloc(osst_max_dev * sizeof(struct osst_tape *), + GFP_ATOMIC); + if (os_scsi_tapes == NULL) { + write_unlock(&os_scsi_tapes_lock); + printk(KERN_ERR "osst :E: Unable to allocate array for OnStream SCSI tapes.\n"); + goto out_put_disk; + } + for (i=0; i < osst_max_dev; ++i) os_scsi_tapes[i] = NULL; + } + + if (osst_nr_dev >= osst_max_dev) { + write_unlock(&os_scsi_tapes_lock); + printk(KERN_ERR "osst :E: Too many tape devices (max. %d).\n", osst_max_dev); + goto out_put_disk; + } + + /* find a free minor number */ + for (i=0; os_scsi_tapes[i] && i<osst_max_dev; i++); + if(i >= osst_max_dev) panic ("Scsi_devices corrupt (osst)"); + dev_num = i; + + /* allocate a struct osst_tape for this device */ + tpnt = (struct osst_tape *)kmalloc(sizeof(struct osst_tape), GFP_ATOMIC); + if (tpnt == NULL) { + write_unlock(&os_scsi_tapes_lock); + printk(KERN_ERR "osst :E: Can't allocate device descriptor, device not attached.\n"); + goto out_put_disk; + } + memset(tpnt, 0, sizeof(struct osst_tape)); + + /* allocate a buffer for this device */ + i = SDp->host->sg_tablesize; + if (osst_max_sg_segs < i) + i = osst_max_sg_segs; + buffer = new_tape_buffer(1, SDp->host->unchecked_isa_dma, i); + if (buffer == NULL) { + write_unlock(&os_scsi_tapes_lock); + printk(KERN_ERR "osst :E: Unable to allocate a tape buffer, device not attached.\n"); + kfree(tpnt); + goto out_put_disk; + } + os_scsi_tapes[dev_num] = tpnt; + tpnt->buffer = buffer; + tpnt->device = SDp; + drive->private_data = &tpnt->driver; + sprintf(drive->disk_name, "osst%d", dev_num); + tpnt->driver = &osst_template; + tpnt->drive = drive; + tpnt->in_use = 0; + tpnt->capacity = 0xfffff; + tpnt->dirty = 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 = OSST_AUTO_LOCK; + tpnt->can_bsr = OSST_IN_FILE_POS; + tpnt->can_partitions = 0; + tpnt->two_fm = OSST_TWO_FM; + tpnt->fast_mteom = OSST_FAST_MTEOM; + tpnt->scsi2_logical = OSST_SCSI2LOGICAL; /* FIXME */ + tpnt->write_threshold = osst_write_threshold; + tpnt->default_drvbuffer = 0xff; /* No forced buffering */ + tpnt->partition = 0; + tpnt->new_partition = 0; + tpnt->nbr_partitions = 0; + tpnt->min_block = 512; + tpnt->max_block = OS_DATA_SIZE; + tpnt->timeout = OSST_TIMEOUT; + tpnt->long_timeout = OSST_LONG_TIMEOUT; + + /* Recognize OnStream tapes */ + /* We don't need to test for OnStream, as this has been done in detect () */ + tpnt->os_fw_rev = osst_parse_firmware_rev (SDp->rev); + tpnt->omit_blklims = 1; + + tpnt->poll = (strncmp(SDp->model, "DI-", 3) == 0) || + (strncmp(SDp->model, "FW-", 3) == 0) || OSST_FW_NEED_POLL(tpnt->os_fw_rev,SDp); + tpnt->frame_in_buffer = 0; + tpnt->header_ok = 0; + tpnt->linux_media = 0; + tpnt->header_cache = NULL; + + for (i=0; i < ST_NBR_MODES; i++) { + STm = &(tpnt->modes[i]); + STm->defined = 0; + STm->sysv = OSST_SYSV; + STm->defaults_for_writes = 0; + STm->do_async_writes = OSST_ASYNC_WRITES; + STm->do_buffer_writes = OSST_BUFFER_WRITES; + STm->do_read_ahead = OSST_READ_AHEAD; + STm->default_compression = ST_DONT_TOUCH; + STm->default_blksize = 512; + 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 = 0; + STps->drv_block = (-1); + STps->drv_file = (-1); + } + + tpnt->current_mode = 0; + tpnt->modes[0].defined = 1; + tpnt->modes[2].defined = 1; + tpnt->density_changed = tpnt->compression_changed = tpnt->blksize_changed = 0; + + init_MUTEX(&tpnt->lock); + osst_nr_dev++; + write_unlock(&os_scsi_tapes_lock); + { + char name[8]; + /* Rewind entry */ + osst_sysfs_add(MKDEV(OSST_MAJOR, dev_num), dev, tpnt, tape_name(tpnt)); + /* No-rewind entry */ + snprintf(name, 8, "%s%s", "n", tape_name(tpnt)); + osst_sysfs_add(MKDEV(OSST_MAJOR, dev_num + 128), dev, tpnt, name); + } + for (mode = 0; mode < ST_NBR_MODES; ++mode) { + /* Rewind entry */ + devfs_mk_cdev(MKDEV(OSST_MAJOR, dev_num + (mode << 5)), + S_IFCHR | S_IRUGO | S_IWUGO, + "%s/ot%s", SDp->devfs_name, osst_formats[mode]); + + /* No-rewind entry */ + devfs_mk_cdev(MKDEV(OSST_MAJOR, dev_num + (mode << 5) + 128), + S_IFCHR | S_IRUGO | S_IWUGO, + "%s/ot%sn", SDp->devfs_name, osst_formats[mode]); + } + drive->number = devfs_register_tape(SDp->devfs_name); + + printk(KERN_INFO + "osst :I: Attached OnStream %.5s tape at scsi%d, channel %d, id %d, lun %d as %s\n", + SDp->model, SDp->host->host_no, SDp->channel, SDp->id, SDp->lun, tape_name(tpnt)); + + return 0; + +out_put_disk: + put_disk(drive); + return -ENODEV; +}; + +static int osst_remove(struct device *dev) +{ + struct scsi_device * SDp = to_scsi_device(dev); + struct osst_tape * tpnt; + int i, mode; + + if ((SDp->type != TYPE_TAPE) || (osst_nr_dev <= 0)) + return 0; + + write_lock(&os_scsi_tapes_lock); + for(i=0; i < osst_max_dev; i++) { + if((tpnt = os_scsi_tapes[i]) && (tpnt->device == SDp)) { + osst_sysfs_destroy(MKDEV(OSST_MAJOR, i)); + osst_sysfs_destroy(MKDEV(OSST_MAJOR, i+128)); + tpnt->device = NULL; + for (mode = 0; mode < ST_NBR_MODES; ++mode) { + devfs_remove("%s/ot%s", SDp->devfs_name, osst_formats[mode]); + devfs_remove("%s/ot%sn", SDp->devfs_name, osst_formats[mode]); + } + devfs_unregister_tape(tpnt->drive->number); + put_disk(tpnt->drive); + os_scsi_tapes[i] = NULL; + osst_nr_dev--; + write_unlock(&os_scsi_tapes_lock); + if (tpnt->header_cache != NULL) vfree(tpnt->header_cache); + if (tpnt->buffer) { + normalize_buffer(tpnt->buffer); + kfree(tpnt->buffer); + } + kfree(tpnt); + return 0; + } + } + write_unlock(&os_scsi_tapes_lock); + return 0; +} + +static int __init init_osst(void) +{ + printk(KERN_INFO "osst :I: Tape driver with OnStream support version %s\nosst :I: %s\n", osst_version, cvsid); + + validate_options(); + osst_sysfs_init(); + + if ((register_chrdev(OSST_MAJOR,"osst", &osst_fops) < 0) || scsi_register_driver(&osst_template.gendrv)) { + printk(KERN_ERR "osst :E: Unable to register major %d for OnStream tapes\n", OSST_MAJOR); + osst_sysfs_cleanup(); + return 1; + } + osst_create_driverfs_files(&osst_template.gendrv); + + return 0; +} + +static void __exit exit_osst (void) +{ + int i; + struct osst_tape * STp; + + osst_remove_driverfs_files(&osst_template.gendrv); + scsi_unregister_driver(&osst_template.gendrv); + unregister_chrdev(OSST_MAJOR, "osst"); + osst_sysfs_cleanup(); + + if (os_scsi_tapes) { + for (i=0; i < osst_max_dev; ++i) { + if (!(STp = os_scsi_tapes[i])) continue; + /* This is defensive, supposed to happen during detach */ + if (STp->header_cache) + vfree(STp->header_cache); + if (STp->buffer) { + normalize_buffer(STp->buffer); + kfree(STp->buffer); + } + put_disk(STp->drive); + kfree(STp); + } + kfree(os_scsi_tapes); + } + printk(KERN_INFO "osst :I: Unloaded.\n"); +} + +module_init(init_osst); +module_exit(exit_osst); |
