patch-2.4.0-prerelease linux/drivers/scsi/osst.c
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- Lines: 5332
- Date:
Sun Dec 31 10:26:17 2000
- Orig file:
v2.4.0-test12/linux/drivers/scsi/osst.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.4.0-test12/linux/drivers/scsi/osst.c linux/drivers/scsi/osst.c
@@ -0,0 +1,5331 @@
+/*
+ SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying
+ file README.st 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 - 2000 Kai Makisara
+ email Kai.Makisara@metla.fi
+
+ $Header: /home/cvsroot/Driver/osst.c,v 1.51 2000/12/22 20:48:27 garloff Exp $
+
+ Microscopic alterations - Rik Ling, 2000/12/21
+ Last modified: Wed Feb 2 22:04:05 2000 by makisara@kai.makisara.local
+ Some small formal changes - aeb, 950809
+*/
+
+static const char * cvsid = "$Id: osst.c,v 1.51 2000/12/22 20:48:27 garloff Exp $";
+const char * osst_version = "0.9.4.3";
+
+/* The "failure to reconnect" firmware bug */
+#define OSST_FW_NEED_POLL_MIN 10602 /*(107A)*/
+#define OSST_FW_NEED_POLL_MAX 10708 /*(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/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/version.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
+
+#define MAJOR_NR OSST_MAJOR
+#include <linux/blk.h>
+
+#include "scsi.h"
+#include "hosts.h"
+#include <scsi/scsi_ioctl.h>
+
+#define ST_KILOBYTE 1024
+
+#include "st.h"
+#include "osst.h"
+#include "osst_options.h"
+#include "osst_detect.h"
+
+#include "constants.h"
+
+static int buffer_kbs = 0;
+static int write_threshold_kbs = 0;
+static int max_buffers = 0;
+static int max_sg_segs = 0;
+
+#ifdef MODULE
+MODULE_AUTHOR("Willem Riede");
+MODULE_DESCRIPTION("OnStream SCSI Tape Driver");
+MODULE_PARM(buffer_kbs, "i");
+MODULE_PARM(write_threshold_kbs, "i");
+MODULE_PARM(max_buffers, "i");
+MODULE_PARM(max_sg_segs, "i");
+#else
+static struct osst_dev_parm {
+ char *name;
+ int *val;
+} parms[] __initdata = {
+ { "buffer_kbs", &buffer_kbs },
+ { "write_threshold_kbs", &write_threshold_kbs },
+ { "max_buffers", &max_buffers },
+ { "max_sg_segs", &max_sg_segs }
+ };
+#endif
+
+/* 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;
+#endif
+
+#define MAX_RETRIES 0
+#define MAX_WRITE_RETRIES 0
+#define MAX_READY_RETRIES 5
+#define NO_TAPE NOT_READY
+
+#define OSST_TIMEOUT (200 * HZ)
+#define OSST_LONG_TIMEOUT (1800 * HZ)
+
+#define TAPE_NR(x) (MINOR(x) & ~(128 | ST_MODE_MASK))
+#define TAPE_MODE(x) ((MINOR(x) & ST_MODE_MASK) >> ST_MODE_SHIFT)
+
+/* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower
+ 24 bits) */
+#define SET_DENS_AND_BLK 0x10001
+
+static int osst_nbr_buffers;
+static int osst_buffer_size = OSST_BUFFER_SIZE;
+static int osst_write_threshold = OSST_WRITE_THRESHOLD;
+static int osst_max_buffers = OSST_MAX_BUFFERS;
+static int osst_max_sg_segs = OSST_MAX_SG;
+
+static OS_Scsi_Tape **os_scsi_tapes = NULL;
+static OSST_buffer **osst_buffers = NULL;
+
+static int modes_defined = FALSE;
+
+static OSST_buffer *new_tape_buffer(int, int);
+static int enlarge_buffer(OSST_buffer *, int, int);
+static void normalize_buffer(OSST_buffer *);
+static int append_to_buffer(const char *, OSST_buffer *, int);
+static int from_buffer(OSST_buffer *, char *, int);
+static int osst_zero_buffer_tail(OSST_buffer *);
+static int osst_copy_to_buffer(OSST_buffer *, unsigned char *);
+static int osst_copy_from_buffer(OSST_buffer *, unsigned char *);
+
+static int osst_init(void);
+static int osst_attach(Scsi_Device *);
+static int osst_detect(Scsi_Device *);
+static void osst_detach(Scsi_Device *);
+
+struct Scsi_Device_Template osst_template =
+{
+ name: "OnStream tape",
+ tag: "osst",
+ scsi_type: TYPE_TAPE,
+ major: OSST_MAJOR,
+ detect: osst_detect,
+ init: osst_init,
+ attach: osst_attach,
+ detach: osst_detach
+};
+
+static int osst_int_ioctl(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt, unsigned int cmd_in,unsigned long arg);
+
+static int osst_set_frame_position(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt, int frame, int skip);
+
+static int osst_get_frame_position(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt);
+
+static int osst_flush_write_buffer(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt, int file_blk);
+
+static int osst_write_error_recovery(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int pending);
+
+
+/* Routines that handle the interaction with mid-layer SCSI routines */
+
+/* Convert the result to success code */
+static int osst_chk_result(OS_Scsi_Tape * STp, Scsi_Request * SRpnt)
+{
+ int dev = TAPE_NR(STp->devt);
+ 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_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 "osst%d: Error: %x, cmd: %x %x %x %x %x %x Len: %d\n",
+ dev, 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 (driver_byte(result) & DRIVER_SENSE)
+ 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 "osst%d: Error with sense data: ", dev);
+ print_req_sense("osst", SRpnt);
+ }
+ else
+ printk(KERN_WARNING
+ "osst%d: Error %x (sugg. bt 0x%x, driver bt 0x%x, host bt 0x%x).\n",
+ dev, result, suggestion(result), driver_byte(result) & DRIVER_MASK,
+ host_byte(result));
+ }
+
+ 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 "osst%d: Recovered %s error (%d).\n", dev, stp,
+ os_scsi_tapes[dev]->recover_count);
+ }
+#endif
+ if ((sense[2] & 0xe0) == 0)
+ return 0;
+ }
+ return (-EIO);
+}
+
+
+/* Wakeup from interrupt */
+static void osst_sleep_done (Scsi_Cmnd * SCpnt)
+{
+ unsigned int dev;
+ int remainder;
+ OS_Scsi_Tape * STp;
+
+ if ((dev = TAPE_NR(SCpnt->request.rq_dev)) < osst_template.nr_dev) {
+ STp = os_scsi_tapes[dev];
+ if ((STp->buffer)->writing &&
+ (SCpnt->sense_buffer[0] & 0x70) == 0x70 &&
+ (SCpnt->sense_buffer[2] & 0x40)) {
+ /* EOM at write-behind, has all been written? */
+ if ((SCpnt->sense_buffer[0] & 0x80) != 0)
+ remainder = (SCpnt->sense_buffer[3] << 24) |
+ (SCpnt->sense_buffer[4] << 16) |
+ (SCpnt->sense_buffer[5] << 8 ) |
+ SCpnt->sense_buffer[6];
+ else
+ remainder = 0;
+ if ((SCpnt->sense_buffer[2] & 0x0f) == VOLUME_OVERFLOW ||
+ remainder > 0)
+ (STp->buffer)->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
+ up(SCpnt->request.sem);
+ }
+#if DEBUG
+ else if (debugging)
+ printk(KERN_ERR "osst?: Illegal interrupt device %x\n", dev);
+#endif
+}
+
+
+/* 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 Scsi_Request * osst_do_scsi(Scsi_Request *SRpnt, OS_Scsi_Tape *STp,
+ unsigned char *cmd, int bytes, int direction, int timeout, int retries, int do_wait)
+{
+ unsigned char *bp;
+//static int inject = 0; /* FIXME - take out inject occasional read errors */
+//static int repeat = 0;
+ if (SRpnt == NULL) {
+ if ((SRpnt = scsi_allocate_request(STp->device)) == NULL) {
+ printk(KERN_ERR "osst%d: Can't get SCSI request.\n", TAPE_NR(STp->devt));
+ if (signal_pending(current))
+ (STp->buffer)->syscall_result = (-EINTR);
+ else
+ (STp->buffer)->syscall_result = (-EBUSY);
+ return NULL;
+ }
+ }
+
+ cmd[1] |= (SRpnt->sr_device->lun << 5) & 0xe0;
+ init_MUTEX_LOCKED(&STp->sem);
+ 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.sem = &(STp->sem);
+ SRpnt->sr_request.rq_status = RQ_SCSI_BUSY;
+ SRpnt->sr_request.rq_dev = STp->devt;
+
+ scsi_do_req(SRpnt, (void *)cmd, bp, bytes, osst_sleep_done, timeout, retries);
+
+ if (do_wait) {
+ down(SRpnt->sr_request.sem);
+ SRpnt->sr_request.sem = NULL;
+ STp->buffer->syscall_result = osst_chk_result(STp, SRpnt);
+//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 "osst%d: injecting read error\n", TAPE_NR(STp->devt));
+// STp->buffer->last_result_fatal = 1; /* FIXME - take out inject occasional read errors */
+//}
+ }
+ return SRpnt;
+}
+
+
+/* Handle the write-behind checking (downs the semaphore) */
+static void osst_write_behind_check(OS_Scsi_Tape *STp)
+{
+ OSST_buffer * STbuffer;
+ ST_partstat * STps;
+
+ STbuffer = STp->buffer;
+
+#if DEBUG
+ if (STp->write_pending)
+ STp->nbr_waits++;
+ else
+ STp->nbr_finished++;
+#endif
+
+ down(&(STp->sem));
+ (STp->buffer)->last_SRpnt->sr_request.sem = 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)
+#if 0
+ memcpy(STbuffer->b_data,
+ STbuffer->b_data + STbuffer->writing,
+ STbuffer->buffer_bytes - STbuffer->writing);
+#else
+ printk(KERN_WARNING "osst: write_behind_check: something left in buffer!\n");
+#endif
+ STbuffer->buffer_bytes -= STbuffer->writing;
+ STps = &(STp->ps[STp->partition]);
+ if (STps->drv_block >= 0) {
+ if (STp->block_size == 0)
+ STps->drv_block++;
+ else
+ STps->drv_block += STbuffer->writing / STp->block_size;
+ }
+ STbuffer->writing = 0;
+
+ return;
+}
+
+
+
+/* Onstream specific Routines */
+/*
+ * Initialize the OnStream AUX
+ */
+static void osst_init_aux(OS_Scsi_Tape * STp, int frame_type, int logical_blk_num)
+{
+ 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(frame_type==OS_FRAME_TYPE_DATA?STp->block_size:0);
+ dat->dat_list[0].blk_cnt = htons(1);
+ 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(logical_blk_num);
+ 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); /* FIXME -- violates ADR spec */
+ aux->phys_fm = ntohl(0xffffffff);
+ aux->last_mark_ppos = ntohl(STp->last_mark_ppos);
+}
+
+/*
+ * Verify that we have the correct tape frame
+ */
+static int osst_verify_frame(OS_Scsi_Tape * STp, int logical_blk_num, int quiet)
+{
+ os_aux_t * aux = STp->buffer->aux;
+ os_partition_t * par = &(aux->partition);
+ ST_partstat * STps = &(STp->ps[STp->partition]);
+ int i;
+ int dev = TAPE_NR(STp->devt);
+
+ if (STp->raw) {
+ if (STp->buffer->syscall_result) {
+ for (i=0; i < STp->buffer->sg_segs; i++)
+ memset(STp->buffer->sg[i].address, 0, STp->buffer->sg[i].length);
+ strcpy(STp->buffer->b_data, "READ ERROR ON FRAME");
+ }
+ return 1;
+ }
+ if (STp->buffer->syscall_result) {
+ printk(KERN_INFO "osst%d: Skipping frame, read error\n", dev);
+ return 0;
+ }
+ if (ntohl(aux->format_id) != 0) {
+ printk(KERN_INFO "osst%d: Skipping frame, format_id %u\n", dev, ntohl(aux->format_id));
+ return 0;
+ }
+ if (memcmp(aux->application_sig, STp->application_sig, 4) != 0 &&
+ (memcmp(aux->application_sig, "LIN3", 4) != 0 || STp->linux_media_version != 4)) {
+ printk(KERN_INFO "osst%d: Skipping frame, incorrect application signature\n", dev);
+ return 0;
+ }
+ if (par->partition_num != OS_DATA_PARTITION) {
+ if (!STp->linux_media || STp->linux_media_version != 2) {
+ printk(KERN_INFO "osst%d: Skipping frame, partition num %d\n", dev, par->partition_num); return 0;
+ }
+ }
+ if (par->par_desc_ver != OS_PARTITION_VERSION) {
+ printk(KERN_INFO "osst%d: Skipping frame, partition version %d\n", dev, par->par_desc_ver);
+ return 0;
+ }
+ if (ntohs(par->wrt_pass_cntr) != STp->wrt_pass_cntr) {
+ printk(KERN_INFO "osst%d: Skipping frame, wrt_pass_cntr %d (expected %d)\n",
+ dev, ntohs(par->wrt_pass_cntr), STp->wrt_pass_cntr);
+ return 0;
+ }
+ if (aux->frame_seq_num != aux->logical_blk_num) {
+ printk(KERN_INFO "osst%d: Skipping frame, seq != logical\n", dev);
+ return 0;
+ }
+ if (aux->frame_type != OS_FRAME_TYPE_DATA &&
+ aux->frame_type != OS_FRAME_TYPE_EOD &&
+ aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ if (!quiet)
+ printk(KERN_INFO "osst%d: Skipping frame, frame type %x\n", dev, aux->frame_type);
+ return 0;
+ }
+ if (aux->frame_type == OS_FRAME_TYPE_EOD &&
+ STp->first_frame_position < STp->eod_frame_ppos) {
+ printk(KERN_INFO "osst%d: Skipping premature EOD frame %d\n", dev, STp->first_frame_position);
+ return 0;
+ }
+ STp->logical_blk_in_buffer = 1;
+
+ if (logical_blk_num != -1 && ntohl(aux->logical_blk_num) != logical_blk_num) {
+ if (!quiet)
+ printk(KERN_INFO "osst%d: Skipping frame, logical_blk_num %u (expected %d)\n",
+ dev, ntohl(aux->logical_blk_num), logical_blk_num);
+ return 0;
+ }
+ 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 1 //DEBUG
+ printk(OSST_DEB_MSG "osst%i: %s filemark %d at frame %d\n", dev,
+ 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;
+ }
+ if (aux->frame_type == OS_FRAME_TYPE_DATA) {
+ STps->eof = ST_NOEOF;
+ }
+ return 1;
+}
+
+/*
+ * Wait for the unit to become Ready
+ */
+static int osst_wait_ready(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, unsigned timeout)
+{
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt;
+ long startwait = jiffies;
+#if DEBUG
+ int dbg = debugging;
+ int dev = TAPE_NR(STp->devt);
+
+ printk(OSST_DEB_MSG "osst%d: Reached onstream wait ready\n", dev);
+#endif
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = TEST_UNIT_READY;
+
+ SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, SCSI_DATA_NONE, STp->timeout, MAX_READY_RETRIES, TRUE);
+ *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) ) {
+#if DEBUG
+ if (debugging) {
+ printk(OSST_DEB_MSG "osst%d: Sleeping in onstream wait ready\n", dev);
+ printk(OSST_DEB_MSG "osst%d: Turning off debugging for a while\n", dev);
+ debugging = 0;
+ }
+#endif
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout(HZ / 10);
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = TEST_UNIT_READY;
+
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, SCSI_DATA_NONE, STp->timeout, MAX_READY_RETRIES, TRUE);
+ }
+ *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 "osst%d: Abnormal exit from onstream wait ready\n", dev);
+printk(OSST_DEB_MSG "osst%d: Result = %d, Sense: 0=%02x, 2=%02x, 12=%02x, 13=%02x\n", dev,
+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 "osst%d: Normal exit from onstream wait ready\n", dev);
+#endif
+ return 0;
+}
+
+static int osst_position_tape_and_confirm(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int frame)
+{
+ int retval;
+
+ osst_wait_ready(STp, aSRpnt, 15 * 60); /* 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);
+ return (osst_get_frame_position(STp, aSRpnt));
+}
+
+/*
+ * Wait for write(s) to complete
+ */
+static int osst_flush_drive_buffer(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt;
+
+ int result = 0;
+#if DEBUG
+ int dev = TAPE_NR(STp->devt);
+
+ printk(OSST_DEB_MSG "osst%d: Reached onstream flush drive buffer (write filemark)\n", dev);
+#endif
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = WRITE_FILEMARKS;
+ cmd[1] = 1;
+
+ SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, SCSI_DATA_NONE, STp->timeout, MAX_WRITE_RETRIES, TRUE);
+ *aSRpnt = SRpnt;
+ if (!SRpnt) return (-EBUSY);
+
+ if ((STp->buffer)->syscall_result)
+ result = osst_write_error_recovery(STp, aSRpnt, 0);
+
+ result |= osst_wait_ready(STp, aSRpnt, 5 * 60);
+ STp->ps[STp->partition].rw = ST_IDLE;
+ return (result);
+}
+
+#define OSST_POLL_PER_SEC 10
+static int osst_wait_frame(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int curr, int minlast, int to)
+{
+ long startwait = jiffies;
+ int dev = TAPE_NR(STp->devt);
+#if DEBUG
+ char notyetprinted = 1;
+#endif
+ if ((minlast >= 0 && STp->ps[STp->partition].rw != ST_READING) ||
+ (minlast < 0 && STp->ps[STp->partition].rw != ST_WRITING) )
+ printk(KERN_ERR "osst%i: waiting for frame without having initialized %s!\n",
+ dev, minlast<0?"write":"read");
+
+ 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; /* successfull 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
+ "osst%i: Succ wait f fr %i (>%i): %i-%i %i (%i): %3li.%li s\n",
+ dev, 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 "osst%i: Wait for frame %i (>%i): %i-%i %i (%i)\n",
+ dev, curr, curr+minlast, STp->first_frame_position,
+ STp->last_frame_position, STp->cur_frames, result);
+ notyetprinted--;
+ }
+#endif
+ current->state = TASK_INTERRUPTIBLE;
+ schedule_timeout (HZ / OSST_POLL_PER_SEC);
+ }
+#if DEBUG
+ printk (OSST_DEB_MSG "osst%i: Fail wait f fr %i (>%i): %i-%i %i: %3li.%li s\n",
+ dev, 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;
+}
+
+/*
+ * Read the next OnStream tape block at the current location
+ */
+static int osst_read_block(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int timeout)
+{
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt;
+ int retval = 0;
+#if DEBUG
+ os_aux_t * aux = STp->buffer->aux;
+ int dev = TAPE_NR(STp->devt);
+#endif
+
+ /* TODO: Error handling */
+ if (STp->poll)
+ retval = osst_wait_frame (STp, aSRpnt, STp->first_frame_position, 0, timeout);
+#if 0// DEBUG
+ printk ("osst_read: wait for frame returned %i\n", retval);
+#endif
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = READ_6;
+ cmd[1] = 1;
+ cmd[4] = 1;
+
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%i: Reading block from OnStream tape\n", dev);
+#endif
+ SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, OS_FRAME_SIZE, SCSI_DATA_READ,
+ STp->timeout, MAX_RETRIES, TRUE);
+ *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;
+ printk(OSST_DEB_MSG "osst: recording read error at %d\n", STp->read_error_frame);/*FIXME*/
+ }
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n",
+ dev,
+ 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) {
+ printk(OSST_DEB_MSG "osst%i: AUX: %c%c%c%c UpdFrCt#%d %s FrSeq#%d LogBlk#%d\n", dev,
+ aux->application_sig[0], aux->application_sig[1],
+ aux->application_sig[2], aux->application_sig[3], ntohl(aux->update_frame_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) );
+ if (aux->frame_type==2)
+ printk(OSST_DEB_MSG "osst%i: mark_cnt=%d, last_mark=%d, next_mark=%d\n", dev,
+ ntohl(aux->filemark_cnt), ntohl(aux->last_mark_ppos), ntohl(aux->next_mark_ppos));
+ printk(OSST_DEB_MSG "osst%i: Exit read block from OnStream tape with code %d\n", dev, retval);
+ }
+#endif
+ return (retval);
+}
+
+static int osst_initiate_read(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ ST_partstat * STps = &(STp->ps[STp->partition]);
+ Scsi_Request * SRpnt ;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ int retval = 0;
+#if DEBUG
+ int dev = TAPE_NR(STp->devt);
+#endif
+
+ if (STps->rw != ST_READING) { /* Initialize read operation */
+ if (STps->rw == ST_WRITING) {
+ osst_flush_write_buffer(STp, aSRpnt, 1);
+ osst_flush_drive_buffer(STp, aSRpnt);
+ }
+ STps->rw = ST_READING;
+ STp->logical_blk_in_buffer = 0;
+
+ /*
+ * Issue a read 0 command to get the OnStream drive
+ * read blocks into its buffer.
+ */
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = READ_6;
+ cmd[1] = 1;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Start Read Ahead on OnStream tape\n", dev);
+#endif
+ SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, 0, SCSI_DATA_NONE, STp->timeout, MAX_RETRIES, TRUE);
+ *aSRpnt = SRpnt;
+ retval = STp->buffer->syscall_result;
+ }
+
+ return retval;
+}
+
+static int osst_get_logical_blk(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int logical_blk_num, int quiet)
+{
+ ST_partstat * STps = &(STp->ps[STp->partition]);
+ int dev = TAPE_NR(STp->devt);
+ int cnt = 0,
+ bad = 0,
+ past = 0,
+ x,
+ position;
+
+ /*
+ * Search and wait for the next logical tape block
+ */
+ while (1) {
+ if (cnt++ > 400) {
+ printk(KERN_WARNING "osst%d: Couldn't find logical block %d, aborting\n",
+ dev, logical_blk_num);
+ if (STp->read_error_frame) {
+ osst_set_frame_position(STp, aSRpnt, STp->read_error_frame, 0);
+#if 1 //DEBUG
+ printk(OSST_DEB_MSG "osst%d: Repositioning tape to bad block %d\n",
+ dev, STp->read_error_frame);
+#endif
+ STp->read_error_frame = 0;
+ }
+ return (-EIO);
+ }
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Looking for block %d, attempt %d\n",
+ dev, logical_blk_num, cnt);
+#endif
+ if ( osst_initiate_read(STp, aSRpnt)
+ || ( (!STp->logical_blk_in_buffer) && osst_read_block(STp, aSRpnt, 30) ) ) {
+ position = osst_get_frame_position(STp, aSRpnt);
+ if (position >= 0xbae && position < 0xbb8)
+ position = 0xbb8;
+ else if (position > STp->eod_frame_ppos || ++bad == 10) {
+printk(OSST_DEB_MSG "osst%d: start again from pos %d, eod %d, bad %d\n", dev, position, STp->eod_frame_ppos, bad); /*FIXME*/
+ position = STp->read_error_frame - 1;
+ }
+ else {
+ position += 39;
+ cnt += 20;
+ }
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Bad block detected, positioning tape to block %d\n",
+ dev, position);
+#endif
+ osst_set_frame_position(STp, aSRpnt, position, 0);
+ continue;
+ }
+ if (osst_verify_frame(STp, logical_blk_num, quiet))
+ break;
+ if (osst_verify_frame(STp, -1, quiet)) {
+ x = ntohl(STp->buffer->aux->logical_blk_num);
+ if (STp->fast_open) {
+#if 1 //DEBUG
+ printk(OSST_DEB_MSG
+ "osst%d: Found logical block %d instead of %d after fast open\n",
+ dev, x, logical_blk_num);
+#endif
+ STp->header_ok = 0;
+ STp->read_error_frame = 0;
+ return (-EIO);
+ }
+ if (x > logical_blk_num) {
+ if (++past > 3) {
+ /* positioning backwards did not bring us to the desired block */
+ position = STp->read_error_frame - 1;
+ }
+ else
+ position = osst_get_frame_position(STp, aSRpnt)
+ + logical_blk_num - x - 1;
+#if 1 //DEBUG
+ printk(OSST_DEB_MSG
+ "osst%d: Found logical block %d while looking for %d: back up %d\n",
+ dev, x, logical_blk_num,
+ 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 "osst%d: Skipping config partition\n", dev);
+#endif
+ osst_set_frame_position(STp, aSRpnt, 0xbb8, 0);
+ cnt--;
+ }
+ STp->logical_blk_in_buffer = 0;
+ }
+ if (cnt > 1) {
+ STp->recover_count++;
+ STp->recover_erreg++;
+ }
+ STp->logical_blk_num = ntohl(STp->buffer->aux->logical_blk_num);
+
+#if DEBUG
+ if (debugging || STps->eof)
+ printk(OSST_DEB_MSG "osst%i: Exit get logical block (%d=>%d) from OnStream tape with code %d\n", dev, logical_blk_num, STp->logical_blk_num, STps->eof);
+#endif
+ STp->fast_open = FALSE;
+ STp->read_error_frame = 0;
+ return (STps->eof);
+}
+
+static int osst_seek_logical_blk(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int logical_blk_num)
+{
+ int estimate;
+ int retries = 0;
+ int dev = TAPE_NR(STp->devt);
+
+ if (logical_blk_num < 0) logical_blk_num = 0;
+ /* FIXME -- this may not be valid for foreign formats */
+ if (logical_blk_num < 2980) estimate = logical_blk_num + 10;
+ else estimate = logical_blk_num + 20;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Seeking logical block %d (now at %d)\n",
+ dev, logical_blk_num, STp->logical_blk_num);
+#endif
+ while (++retries < 10) {
+ osst_set_frame_position(STp, aSRpnt, estimate, 0);
+ if (osst_get_logical_blk(STp, aSRpnt, logical_blk_num, 1) >= 0)
+ return 0;
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 1) < 0)
+ goto error;
+ if (STp->logical_blk_num != logical_blk_num)
+ estimate += logical_blk_num - STp->logical_blk_num;
+ else
+ break;
+ }
+error:
+ printk(KERN_WARNING "osst%d: Couldn't seek to logical block %d (at %d), %d retries\n",
+ dev, logical_blk_num, STp->logical_blk_num, retries);
+ return (-EIO);
+}
+
+static int osst_seek_frame(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int frame)
+{
+ ST_partstat * STps = &(STp->ps[STp->partition]);
+ int r;
+
+ if (frame < 0 || frame >= STp->capacity) return (-ENXIO);
+
+ if (frame <= STp->first_data_ppos) {
+ 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, frame-1, 0);
+ if (r < 0) return r;
+
+ r = osst_get_logical_blk(STp, aSRpnt, -1, 1);
+ if (r < 0) return r;
+
+ if (osst_get_frame_position(STp, aSRpnt) != frame) return (-EIO);
+
+ STp->logical_blk_num++;
+ STp->logical_blk_in_buffer = 0;
+ STps->drv_file = htonl(STp->buffer->aux->filemark_cnt);
+ STps->drv_block = -1;
+ STps->eof = ST_NOEOF;
+ return 0;
+}
+
+/*
+ * Read back the drive's internal buffer contents, as a part
+ * of the write error recovery mechanism for old OnStream
+ * firmware revisions.
+ */
+static int osst_read_back_buffer_and_rewrite(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt,
+ unsigned int block, unsigned int skip, int pending)
+{
+ Scsi_Request * SRpnt = * aSRpnt;
+ unsigned char * buffer, * p;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ int frames, flag, new_block, i, logical_blk_num;
+ int dev = TAPE_NR(STp->devt);
+ long startwait = jiffies;
+#if DEBUG
+ int dbg = debugging;
+#endif
+
+ frames = STp->cur_frames;
+ if ((buffer = (unsigned char *)vmalloc((frames + pending) * OS_DATA_SIZE)) == NULL)
+ return (-EIO);
+
+ logical_blk_num = STp->logical_blk_num - frames - pending;
+ printk(KERN_INFO "osst%d: Reading back %d frames from drive buffer%s\n",
+ dev, frames, pending?" and one that was pending":"");
+
+ if (pending) {
+ osst_copy_from_buffer(STp->buffer, (p = &buffer[frames * OS_DATA_SIZE]));
+// memcpy((p = &buffer[frames * OS_DATA_SIZE]), STp->buffer->b_data, OS_DATA_SIZE);
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Pending logical block %d, data %x %x %x %x\n",
+ dev, logical_blk_num + frames, p[0], p[1], p[2], p[3]);
+#endif
+ }
+ for (i = 0, p = buffer; i < frames; 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, SCSI_DATA_READ,
+ STp->timeout, MAX_RETRIES, TRUE);
+
+ if ((STp->buffer)->syscall_result) {
+ printk(KERN_ERR "osst%d: Failed to read block back from OnStream buffer\n", dev);
+ vfree((void *)buffer);
+ *aSRpnt = SRpnt;
+ return (-EIO);
+ }
+ osst_copy_from_buffer(STp->buffer, p);
+// memcpy(p, STp->buffer->b_data, OS_DATA_SIZE);
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Read back logical block %d, data %x %x %x %x\n",
+ dev, logical_blk_num + i, p[0], p[1], p[2], p[3]);
+#endif
+ }
+ *aSRpnt = SRpnt;
+ osst_get_frame_position(STp, aSRpnt);
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Frames left in buffer: %d\n", dev, 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 blocks that fail, just the ones after them */
+
+ for (flag=1, new_block=block, p=buffer, i=0; i < frames + pending; ) {
+
+ if (flag) {
+ if (STp->write_type == OS_WRITE_HEADER) {
+ i += skip;
+ p += skip * OS_DATA_SIZE;
+ }
+ else if (new_block < 2990 && new_block+skip+frames+pending >= 2990)
+ new_block = 3000-i;
+ else
+ new_block += skip;
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Position to frame %d, write lblk %d\n",
+ dev, new_block+i, logical_blk_num+i); /* FIXME var blk sz */
+#endif
+ osst_set_frame_position(STp, aSRpnt, new_block + i, 0);
+ osst_wait_ready(STp, aSRpnt, 60);
+ osst_get_frame_position(STp, aSRpnt);
+ SRpnt = * aSRpnt;
+
+ if (new_block > block + 1000) {
+ printk(KERN_ERR "osst%d: Failed to find valid tape media\n", dev);
+ vfree((void *)buffer);
+ return (-EIO);
+ }
+ flag = 0;
+ if ( i >= frames + pending ) break;
+ }
+ osst_copy_to_buffer(STp->buffer, p);
+// memcpy(STp->buffer->b_data, p, OS_DATA_SIZE);
+ /*
+ * IMPORTANT: for error recovery to work, _never_ queue frames with mixed frame type!
+ */
+ osst_init_aux(STp, STp->buffer->aux->frame_type, logical_blk_num+i );
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = WRITE_6;
+ cmd[1] = 1;
+ cmd[4] = 1;
+
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: About to attempt to write to frame %d\n", dev, new_block+i);
+#endif
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, OS_FRAME_SIZE, SCSI_DATA_WRITE,
+ STp->timeout, MAX_WRITE_RETRIES, TRUE);
+
+ 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 == frames + pending ) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Check re-write successful\n", dev);
+#endif
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = WRITE_FILEMARKS;
+ cmd[1] = 1;
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, 0, SCSI_DATA_NONE,
+ STp->timeout, MAX_WRITE_RETRIES, TRUE);
+#if DEBUG
+ if (debugging) {
+ printk(OSST_DEB_MSG "osst%d: Sleeping in re-write wait ready\n", dev);
+ printk(OSST_DEB_MSG "osst%d: Turning off debugging for a while\n", dev);
+ 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, SCSI_DATA_NONE, STp->timeout,
+ MAX_READY_RETRIES, TRUE);
+
+ 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 */
+ schedule_timeout(HZ / 10);
+ continue;
+ }
+ if (STp->buffer->syscall_result)
+ flag = 1;
+ break;
+ }
+#if DEBUG
+ debugging = dbg;
+ printk(OSST_DEB_MSG "osst%d: Wait re-write finished\n", dev);
+#endif
+ }
+ }
+ 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 "osst%d: Volume overflow in write error recovery\n", dev);
+ 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_block;
+ p = &buffer[i * OS_DATA_SIZE];
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Additional write error at %d\n", dev, new_block+i);
+#endif
+ osst_get_frame_position(STp, aSRpnt);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: reported frame positions: host = %d, tape = %d\n",
+ dev, STp->first_frame_position, STp->last_frame_position);
+#endif
+ }
+ *aSRpnt = SRpnt;
+ }
+ vfree((void *)buffer);
+ return 0;
+}
+
+static int osst_reposition_and_retry(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt,
+ unsigned int block, unsigned int skip, int pending)
+{
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt = * aSRpnt;
+ int dev = TAPE_NR(STp->devt);
+ int attempts = 1000 / skip;
+ int flag = 1;
+ 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 (block < 2990 && block+skip+STp->cur_frames+pending >= 2990)
+ block = 3000-skip;
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Position to frame %d, re-write from lblk %d\n",
+ dev, block+skip, STp->logical_blk_num-STp->cur_frames-pending);
+#endif
+ osst_set_frame_position(STp, aSRpnt, block + skip, 1);
+ flag = 0;
+ attempts--;
+ }
+ if (osst_get_frame_position(STp, aSRpnt) < 0) { /* additional write error */
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Addl error, host %d, tape %d, buffer %d\n",
+ dev, STp->first_frame_position,
+ STp->last_frame_position, STp->cur_frames);
+#endif
+ block = 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 "osst%d: About to write pending lblk %d at frame %d\n",
+ dev, STp->logical_blk_num-1, STp->first_frame_position);
+#endif
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, OS_FRAME_SIZE, SCSI_DATA_WRITE,
+ STp->timeout, MAX_WRITE_RETRIES, TRUE);
+ *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(OSST_DEB_MSG
+ "osst%d: Volume overflow in write error recovery\n",
+ dev);
+ 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 "osst%d: Wait re-write finished\n", dev);
+#endif
+ return 0;
+ }
+#if DEBUG
+ if (debugging) {
+ printk(OSST_DEB_MSG "osst%d: Sleeping in re-write wait ready\n", dev);
+ printk(OSST_DEB_MSG "osst%d: Turning off debugging for a while\n", dev);
+ debugging = 0;
+ }
+#endif
+ schedule_timeout(HZ / 10);
+ }
+ printk(KERN_ERR "osst%d: Failed to find valid tape media\n", dev);
+#if DEBUG
+ debugging = dbg;
+#endif
+ return (-EIO);
+}
+
+/*
+ * Error recovery algorithm for the OnStream tape.
+ */
+
+static int osst_write_error_recovery(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int pending)
+{
+ Scsi_Request * SRpnt = * aSRpnt;
+ ST_partstat * STps = & STp->ps[STp->partition];
+ int dev = TAPE_NR(STp->devt);
+ int retval = 0;
+ int rw_state;
+ unsigned int block, 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 "osst%d: Write error recovery cannot handle %02x:%02x:%02x\n",
+ dev, SRpnt->sr_sense_buffer[2], SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]);
+#endif
+ return (-EIO);
+ }
+ block = (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 "osst%d: Detected physical bad block at %u, advised to skip %d\n", dev, block, skip);
+#endif
+ osst_get_frame_position(STp, aSRpnt);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: reported frame positions: host = %d, tape = %d\n",
+ dev, 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 "osst%d: Relocating %d buffered logical blocks to physical block %u\n",
+ dev, STp->cur_frames, block + skip);
+ if (STp->os_fw_rev >= 10600)
+ retval = osst_reposition_and_retry(STp, aSRpnt, block, skip, pending);
+ else
+ retval = osst_read_back_buffer_and_rewrite(STp, aSRpnt, block, skip, pending);
+ break;
+ case OS_WRITE_LAST_MARK:
+ printk(KERN_ERR "osst%d: Bad block in update last marker, fatal\n", dev);
+ osst_set_frame_position(STp, aSRpnt, block + STp->cur_frames + pending, 0);
+ retval = -EIO;
+ break;
+ case OS_WRITE_HEADER:
+ printk(KERN_WARNING "osst%d: Bad block in header partition, skipped\n", dev);
+ retval = osst_read_back_buffer_and_rewrite(STp, aSRpnt, block, 1, pending);
+ break;
+ default:
+ printk(KERN_WARNING "osst%d: Bad block in filler, ignored\n", dev);
+ osst_set_frame_position(STp, aSRpnt, block + STp->cur_frames + pending, 0);
+ }
+ osst_get_frame_position(STp, aSRpnt);
+#if DEBUG
+ printk(KERN_ERR "osst%d: Positioning complete, cur_frames %d, pos %d, tape pos %d\n",
+ dev, STp->cur_frames, STp->first_frame_position, STp->last_frame_position);
+ printk(OSST_DEB_MSG "osst%d: next logical block to write: %d\n", dev, STp->logical_blk_num);
+#endif
+ if (retval == 0) {
+ STp->recover_count++;
+ STp->recover_erreg++;
+ }
+ STps->rw = rw_state;
+ return retval;
+}
+
+static int osst_space_over_filemarks_backward(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt,
+ int mt_op, int mt_count)
+{
+ int dev = TAPE_NR(STp->devt);
+ int cnt;
+ int last_mark_ppos = -1;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Reached space_over_filemarks_backwards %d %d\n", dev, mt_op, mt_count);
+#endif
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks_bwd\n", dev);
+ 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 1 //DEBUG
+ if (STp->header_cache == NULL || (cnt - mt_count) < 0 || (cnt - mt_count) >= OS_FM_TAB_MAX)
+ printk(OSST_DEB_MSG "osst%i: Filemark lookup fail due to %s\n", dev,
+ STp->header_cache == NULL?"lack of header cache":"count out of range");
+ else
+ printk(OSST_DEB_MSG "osst%i: Filemark lookup: prev mark %d (%s), skip %d to %d\n",
+ dev, 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_set_frame_position(STp, aSRpnt, last_mark_ppos, 0);
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks\n", dev);
+ return (-EIO);
+ }
+ if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ printk(KERN_INFO "osst%i: Expected to find marker at block %d, not found\n",
+ dev, last_mark_ppos);
+ return (-EIO);
+ }
+ if (mt_op == MTBSFM) {
+ STp->logical_blk_num++;
+ STp->logical_blk_in_buffer = 0;
+ }
+ return 0;
+ }
+ printk(KERN_INFO "osst%i: Reverting to scan filemark backwards\n", dev);
+ }
+ 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 "osst%i: Positioning to last mark at %d\n", dev, last_mark_ppos);
+#endif
+ osst_set_frame_position(STp, aSRpnt, last_mark_ppos, 0);
+ cnt++;
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks\n", dev);
+ return (-EIO);
+ }
+ if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ printk(KERN_INFO "osst%i: Expected to find marker at block %d, not found\n", dev, last_mark_ppos);
+ return (-EIO);
+ }
+ }
+ if (mt_op == MTBSFM) {
+ STp->logical_blk_num++;
+ STp->logical_blk_in_buffer = 0;
+ }
+ 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(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt,
+ int mt_op, int mt_count)
+{
+ int dev = TAPE_NR(STp->devt);
+ int cnt = 0;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Reached space_over_filemarks_forward_slow %d %d\n", dev, mt_op, mt_count);
+#endif
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks_fwd\n", dev);
+ return (-EIO);
+ }
+ while (1) {
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks\n", dev);
+ 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 "osst%i: space_fwd: EOD reached\n", dev);
+#endif
+ if (STp->first_frame_position > STp->eod_frame_ppos+1) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: EOD position corrected (%d=>%d)\n",
+ dev, 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->logical_blk_in_buffer = 0;
+ }
+ if (mt_op == MTFSF) {
+ STp->logical_blk_num++;
+ STp->logical_blk_in_buffer = 0;
+ }
+ return 0;
+}
+
+/*
+ * Fast linux specific version of OnStream FSF
+ */
+static int osst_space_over_filemarks_forward_fast(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt,
+ int mt_op, int mt_count)
+{
+ int dev = TAPE_NR(STp->devt);
+ int cnt = 0,
+ next_mark_ppos = -1;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Reached space_over_filemarks_forward_fast %d %d\n", dev, mt_op, mt_count);
+#endif
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks_fwd\n", dev);
+ 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 1 //DEBUG
+ if (STp->header_cache == NULL || (cnt + mt_count) >= OS_FM_TAB_MAX)
+ printk(OSST_DEB_MSG "osst%i: Filemark lookup fail due to %s\n", dev,
+ STp->header_cache == NULL?"lack of header cache":"count out of range");
+ else
+ printk(OSST_DEB_MSG "osst%i: Filemark lookup: prev mark %d (%s), skip %d to %d\n", dev, 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) {
+ printk(KERN_INFO "osst%i: Reverting to slow filemark space\n", dev);
+ return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count);
+ } else {
+ osst_set_frame_position(STp, aSRpnt, next_mark_ppos, 0);
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks\n", dev);
+ return (-EIO);
+ }
+ if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ printk(KERN_INFO "osst%i: Expected to find marker at block %d, not found\n",
+ dev, next_mark_ppos);
+ return (-EIO);
+ }
+ if (ntohl(STp->buffer->aux->filemark_cnt) != cnt + mt_count) {
+ printk(KERN_INFO "osst%i: Expected to find marker %d at block %d, not %d\n",
+ dev, 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 "osst%i: space_fwd: EOD reached\n", dev);
+#endif
+ return (-EIO);
+ }
+ if (ntohl(STp->buffer->aux->filemark_cnt) == 0) {
+ if (STp->first_mark_ppos == -1) {
+ printk(KERN_INFO "osst%i: Reverting to slow filemark space\n", dev);
+ return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count);
+ }
+ osst_set_frame_position(STp, aSRpnt, STp->first_mark_ppos, 0);
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO
+ "osst%i: Couldn't get logical blk num in space_filemarks_fwd_fast\n",
+ dev);
+ return (-EIO);
+ }
+ if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ printk(KERN_INFO "osst%i: Expected to find filemark at %d\n",
+ dev, 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) {
+ printk(KERN_INFO "osst%i: Reverting to slow filemark space\n", dev);
+ return osst_space_over_filemarks_forward_slow(STp, aSRpnt, mt_op, mt_count - cnt);
+ }
+#if DEBUG
+ else printk(OSST_DEB_MSG "osst%i: Positioning to next mark at %d\n", dev, next_mark_ppos);
+#endif
+ osst_set_frame_position(STp, aSRpnt, next_mark_ppos, 0);
+ cnt++;
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+ printk(KERN_INFO "osst%i: Couldn't get logical blk num in space_filemarks\n", dev);
+ return (-EIO);
+ }
+ if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ printk(KERN_INFO "osst%i: Expected to find marker at block %d, not found\n",
+ dev, next_mark_ppos);
+ return (-EIO);
+ }
+ }
+ }
+ if (mt_op == MTFSF)
+ STp->logical_blk_num++;
+ STp->logical_blk_in_buffer = 0;
+ 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(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int retries)
+{
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt = * aSRpnt;
+ int dev = TAPE_NR(STp->devt);
+
+ 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 "osst%i: Setting number of retries on OnStream tape to %d\n", dev, retries);
+
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], SCSI_DATA_WRITE, STp->timeout, 0, TRUE);
+ *aSRpnt = SRpnt;
+
+ if ((STp->buffer)->syscall_result)
+ printk (KERN_ERR "osst%d: Couldn't set retries to %d\n", dev, retries);
+}
+#endif
+
+#if 0
+static void osst_update_markers(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int last_mark_ppos, int this_mark_ppos)
+{
+ int dev = TAPE_NR(STp->devt);
+ int frame,
+ reslt;
+
+ if (STp->raw) return;
+
+ STp->last_mark_ppos = this_mark_ppos;
+ 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;
+
+ if (STp->linux_media_version >= 4) return;
+ if (last_mark_ppos == -1) return;
+
+ STp->write_type = OS_WRITE_LAST_MARK;
+ frame = osst_get_frame_position(STp, aSRpnt);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Update last_marker at frame %d\n", dev, last_mark_addr);
+ printk(OSST_DEB_MSG "osst%i: current position %d, lblk %d, tape blk %d\n",
+ dev, frame, STp->logical_blk_num, STp->last_frame_position);
+#endif
+ osst_set_frame_position(STp, aSRpnt, last_mark_ppos, 0);
+ osst_initiate_read (STp, aSRpnt);
+ reslt = osst_read_block(STp, aSRpnt, 180);
+
+ if (reslt) {
+ printk(KERN_WARNING "osst%i: couldn't read last marker\n", dev);
+ osst_set_frame_position(STp, aSRpnt, frame, 0);
+ return;
+ }
+ if (STp->buffer->aux->frame_type != OS_FRAME_TYPE_MARKER) {
+ printk(KERN_WARNING "osst%i: expected marker at addr %d\n", dev, last_mark_ppos);
+ osst_set_frame_position(STp, aSRpnt, frame, 0);
+ return;
+ }
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: writing back marker\n", dev);
+#endif
+ STp->buffer->aux->next_mark_ppos = htonl(this_mark_ppos);
+ osst_set_frame_position(STp, aSRpnt, last_mark_ppos, 0);
+ STp->dirty = 1;
+ if (osst_flush_write_buffer(STp, aSRpnt, 0) ||
+ osst_flush_drive_buffer(STp, aSRpnt) ) {
+ printk(KERN_WARNING "osst%i: couldn't write marker back at addr %d\n", dev, last_mark_ppos);
+ }
+ osst_set_frame_position(STp, aSRpnt, frame, 0);
+
+ return; /* FIXME -- errors should go back to user space */
+}
+#endif
+
+static int osst_write_filemark(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ int result;
+ int this_mark_ppos;
+#if DEBUG
+ int dev = TAPE_NR(STp->devt);
+#endif
+
+ if (STp->raw) return 0;
+
+ STp->write_type = OS_WRITE_NEW_MARK;
+ this_mark_ppos = osst_get_frame_position(STp, aSRpnt);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Writing Filemark %i at frame %d (lblk %d)\n",
+ dev, STp->filemark_cnt, this_mark_ppos, STp->logical_blk_num);
+#endif
+ osst_init_aux(STp, OS_FRAME_TYPE_MARKER, STp->logical_blk_num++);
+ STp->ps[STp->partition].rw = ST_WRITING;
+ STp->dirty = 1;
+ result = osst_flush_write_buffer(STp, aSRpnt, 0);
+ result |= osst_flush_drive_buffer(STp, aSRpnt);
+ STp->last_mark_ppos = this_mark_ppos;
+ 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;
+// osst_update_markers(STp, aSRpnt, STp->last_mark_addr, this_mark_addr);
+ return result;
+}
+
+static int osst_write_eod(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ int result;
+#if DEBUG
+ int dev = TAPE_NR(STp->devt);
+#endif
+
+ if (STp->raw) return 0;
+
+ STp->write_type = OS_WRITE_EOD;
+ STp->eod_frame_ppos = osst_get_frame_position(STp, aSRpnt);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Writing EOD at %d=>%d\n", dev, STp->logical_blk_num, STp->eod_frame_ppos);
+#endif
+ osst_init_aux(STp, OS_FRAME_TYPE_EOD, STp->logical_blk_num++);
+ STp->ps[STp->partition].rw = ST_WRITING;
+ STp->dirty = 1;
+
+ result = osst_flush_write_buffer(STp, aSRpnt, 0);
+ result |= osst_flush_drive_buffer(STp, aSRpnt);
+ STp->eod_frame_lfa = --(STp->logical_blk_num);
+ return result;
+}
+
+static int osst_write_filler(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int block, int count)
+{
+ int dev = TAPE_NR(STp->devt);
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Reached onstream write filler group %d\n", dev, block);
+#endif
+ osst_wait_ready(STp, aSRpnt, 60 * 5);
+ osst_set_frame_position(STp, aSRpnt, block, 0);
+ STp->write_type = OS_WRITE_FILLER;
+ osst_init_aux(STp, OS_FRAME_TYPE_FILL, 0);
+ while (count--) {
+ memcpy(STp->buffer->b_data, "Filler", 6);
+ STp->buffer->buffer_bytes = 6;
+ STp->dirty = 1;
+ if (osst_flush_write_buffer(STp, aSRpnt, 0)) {
+ printk(KERN_INFO "osst%i: Couldn't write filler frame\n", dev);
+ return (-EIO);
+ }
+ }
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Exiting onstream write filler group\n", dev);
+#endif
+ return osst_flush_drive_buffer(STp, aSRpnt);
+}
+
+static int __osst_write_header(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int block, int count)
+{
+ int dev = TAPE_NR(STp->devt);
+ int result;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Reached onstream write header group %d\n", dev, block);
+#endif
+ osst_wait_ready(STp, aSRpnt, 60 * 5);
+ osst_set_frame_position(STp, aSRpnt, block, 0);
+ STp->write_type = OS_WRITE_HEADER;
+ STp->ps[STp->partition].rw = ST_WRITING;
+ osst_init_aux(STp, OS_FRAME_TYPE_HEADER, STp->logical_blk_num);
+ 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, 0)) {
+ printk(KERN_INFO "osst%i: Couldn't write header frame\n", dev);
+ return (-EIO);
+ }
+ }
+ result = osst_flush_drive_buffer(STp, aSRpnt);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Write onstream header group %s\n", dev, result?"failed":"done");
+#endif
+ return result;
+}
+
+static int osst_write_header(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int locate_eod)
+{
+ os_header_t * header;
+ int result;
+ int dev = TAPE_NR(STp->devt);
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Writing tape header\n", dev);
+#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 "osst%i: Failed to allocate header cache\n", dev);
+ return (-ENOMEM);
+ }
+ memset(STp->header_cache, 0, sizeof(os_header_t));
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Allocated and cleared memory for header cache\n", dev);
+#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 "osst%i: locating back to eod frame addr %d\n", dev, STp->eod_frame_ppos);
+#endif
+ osst_set_frame_position(STp, aSRpnt, STp->eod_frame_ppos, 0);
+ }
+ if (result)
+ printk(KERN_WARNING "osst%i: write header failed\n", dev);
+ 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(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ if (STp->header_cache != NULL)
+ memset(STp->header_cache, 0, sizeof(os_header_t));
+
+ STp->logical_blk_num = 0;
+ STp->logical_blk_in_buffer = 0;
+ STp->eod_frame_ppos = STp->first_data_ppos = 0x0000000A;
+ STp->filemark_cnt = 0;
+ STp->first_mark_ppos = STp->last_mark_ppos = -1;
+ return osst_write_header(STp, aSRpnt, 1);
+}
+
+static int __osst_analyze_headers(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int block)
+{
+ int dev = TAPE_NR(STp->devt);
+ 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 (block == 5 || block == 0xbae || STp->buffer->syscall_result) {
+ if (osst_set_frame_position(STp, aSRpnt, block, 0))
+ printk(KERN_WARNING "osst%i: Couldn't position tape\n", dev);
+ if (osst_initiate_read (STp, aSRpnt)) {
+ printk(KERN_WARNING "osst%i: Couldn't initiate read\n", dev);
+ return 0;
+ }
+ }
+ if (osst_read_block(STp, aSRpnt, 180)) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Couldn't read header frame\n", dev);
+#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 "osst%i: Skipping non-header frame (%d)\n", dev, block);
+#endif
+ return 0;
+ }
+ if (strncmp(header->ident_str, "ADR_SEQ", 7) != 0 &&
+ strncmp(header->ident_str, "ADR-SEQ", 7) != 0) {
+ strncpy(id_string, header->ident_str, 7);
+ id_string[7] = 0;
+ printk(KERN_INFO "osst%i: Invalid header identification string %s\n", dev, id_string);
+ return 0;
+ }
+ update_frame_cntr = ntohl(aux->update_frame_cntr);
+ if (update_frame_cntr < STp->update_frame_cntr) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Skipping frame %d with update_frame_counter %d<%d\n",
+ dev, block, update_frame_cntr, STp->update_frame_cntr);
+#endif
+ return 0;
+ }
+ if (header->major_rev != 1 || header->minor_rev != 4 ) {
+ printk(KERN_INFO "osst%i: %s revision %d.%d detected (1.4 supported)\n",
+ dev, (header->major_rev != 1 || header->minor_rev < 2 ||
+ header->minor_rev > 4 )? "Invalid" : "Warning:",
+ header->major_rev, header->minor_rev);
+ if (header->major_rev != 1 || header->minor_rev < 2 || header->minor_rev > 4)
+ return 0;
+ }
+ if (header->pt_par_num != 1)
+ printk(KERN_INFO "osst%i: Warning: %d partitions defined, only one supported\n",
+ dev, header->pt_par_num);
+ 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 "osst%i: Linux media version %d detected (current 4)\n",
+ dev, linux_media_version);
+ } else {
+ printk(KERN_WARNING "osst%i: non Linux media detected (%s)\n", dev, id_string);
+ return 0;
+ }
+ if (linux_media_version < STp->linux_media_version) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Skipping frame %d with linux_media_version %d\n",
+ dev, block, linux_media_version);
+#endif
+ return 0;
+ }
+ if (linux_media_version > STp->linux_media_version) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Frame %d sets linux_media_version to %d\n",
+ dev, block, 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 "osst%i: Frame %d sets update_frame_counter to %d\n",
+ dev, block, 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 "osst%i: Failed to allocate header cache\n", dev);
+ return 0;
+ }
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Allocated memory for header cache\n", dev);
+#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->update_frame_cntr = update_frame_cntr;
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: detected write pass %d, update frame counter %d, filemark counter %d\n",
+ dev, STp->wrt_pass_cntr, STp->update_frame_cntr, STp->filemark_cnt);
+ printk(OSST_DEB_MSG "osst%i: first data frame on tape = %d, last = %d, eod frame = %d\n", dev,
+ STp->first_data_ppos,
+ ntohl(header->partition[0].last_frame_ppos),
+ ntohl(header->partition[0].eod_frame_ppos));
+ printk(OSST_DEB_MSG "osst%i: first mark on tape = %d, last = %d, eod frame = %d\n",
+ dev, STp->first_mark_ppos, STp->last_mark_ppos, STp->eod_frame_ppos);
+#endif
+ if (header->minor_rev < 4 && STp->linux_media_version == 4) {
+ printk(OSST_DEB_MSG "osst%i: Moving filemark list to ADR 1.4 location\n", dev);
+ 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 "osst%i: Failed consistency check ADR 1.4 format\n", dev);
+
+// memcpy(STp->header_cache, header, sizeof(os_header_t));
+ }
+
+ return 1;
+}
+
+static int osst_analyze_headers(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ int position, block;
+ int first, last;
+ int valid = 0;
+ int dev = TAPE_NR(STp->devt);
+
+ 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 = -1;
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Reading header\n", dev);
+#endif
+
+ /* optimization for speed - if we are positioned at block 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 (block = first; block < last; block++)
+ if (__osst_analyze_headers(STp, aSRpnt, block))
+ valid = 1;
+
+ first = position==10? 5:0xbae;
+ last = position==10?10:0xbb3;
+
+ for (block = first; block < last; block++)
+ if (__osst_analyze_headers(STp, aSRpnt, block))
+ valid = 1;
+
+ if (!valid) {
+ printk(KERN_ERR "osst%i: Failed to find valid ADRL header, new media?\n", dev);
+ 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->logical_blk_num = 0;
+ }
+ osst_set_frame_position(STp, aSRpnt, position, 0);
+ STp->header_ok = 1;
+
+ return 1;
+}
+
+static int osst_verify_position(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt)
+{
+ int frame_position = STp->first_frame_position;
+ int logical_blk_num = STp->logical_blk_num;
+ int prev_mark_ppos = -1;
+ int actual_mark_ppos, i, n;
+#if 1 //DEBUG
+ int dev = TAPE_NR(STp->devt);
+
+ printk(OSST_DEB_MSG "osst%i: Verify that the tape is really the one we think before writing\n", dev);
+#endif
+ osst_set_frame_position(STp, aSRpnt, frame_position - 1, 0);
+ if (osst_get_logical_blk(STp, aSRpnt, -1, 0) < 0) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Couldn't get logical blk num in verify_position\n", dev);
+#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 ||
+ logical_blk_num != STp->logical_blk_num + 1 ||
+ prev_mark_ppos != actual_mark_ppos ) {
+#if 1 //DEBUG
+ printk(OSST_DEB_MSG "osst%i: Block mismatch: frame %d-%d, lblk %d-%d, mark %d-%d\n", dev,
+ STp->first_frame_position, frame_position, STp->logical_blk_num + 1,
+ logical_blk_num, actual_mark_ppos, prev_mark_ppos);
+#endif
+ return (-EIO);
+ }
+ STp->logical_blk_in_buffer = 0;
+ 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 < 106a < 106B < ... < 1.06
+ * This fn makes monoton numbers out of this scheme ...
+ */
+static unsigned int osst_parse_firmware_rev (const char * str)
+{
+ unsigned int rev;
+ if (str[1] == '.') {
+ rev = (str[0]-0x30)*10000
+ +(str[2]-0x30)*1000
+ +(str[3]-0x30)*100;
+ } else {
+ rev = (str[0]-0x30)*10000
+ +(str[1]-0x30)*1000
+ +(str[2]-0x30)*100 - 100;
+ rev += 2*(str[3] & 0x1f)
+ +(str[3] >= 0x60? 1: 0);
+ }
+ return rev;
+}
+
+/*
+ * Configure the OnStream SCII tape drive for default operation
+ */
+static int osst_configure_onstream(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt)
+{
+ int dev = TAPE_NR(STp->devt);
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ 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 "osst%i: Not Ready\n", dev);
+#endif
+ return (-EIO);
+ }
+
+ if (STp->os_fw_rev < 10600) {
+ printk("osst%i: Old OnStream firmware revision detected (%s)\n",
+ dev, STp->device->rev);
+ printk("osst%i: An upgrade to version 1.06 or above is recommended\n",
+ dev);
+ }
+
+ /*
+ * Configure 32.5KB (data+aux) frame size.
+ * Get the current block 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], SCSI_DATA_READ, STp->timeout, 0, TRUE);
+ if (SRpnt == NULL) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst: Busy\n");
+#endif
+ return (-EBUSY);
+ }
+ *aSRpnt = SRpnt;
+ if ((STp->buffer)->syscall_result != 0) {
+ printk (KERN_ERR "osst%i: Can't get tape block size mode page\n", dev);
+ 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(KERN_INFO "osst%i: 32KB play back: %s\n", dev, bs->play32 ? "Yes" : "No");
+ printk(KERN_INFO "osst%i: 32.5KB play back: %s\n", dev, bs->play32_5 ? "Yes" : "No");
+ printk(KERN_INFO "osst%i: 32KB record: %s\n", dev, bs->record32 ? "Yes" : "No");
+ printk(KERN_INFO "osst%i: 32.5KB record: %s\n", dev, 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], SCSI_DATA_WRITE, STp->timeout, 0, TRUE);
+ *aSRpnt = SRpnt;
+ if ((STp->buffer)->syscall_result != 0) {
+ printk (KERN_ERR "osst%i: Couldn't set tape block size mode page\n", dev);
+ return (-EIO);
+ }
+
+ STp->block_size = (STp->raw) ? OS_FRAME_SIZE : OS_DATA_SIZE;
+ STp->min_block = OS_FRAME_SIZE; /* FIXME */
+ STp->max_block = STp->block_size;
+
+#if DEBUG
+ printk(KERN_INFO "osst%i: Block Size changed to 32.5K\n", dev);
+ /*
+ * 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], SCSI_DATA_WRITE, STp->timeout, 0, TRUE);
+ *aSRpnt = SRpnt;
+
+ if ((STp->buffer)->syscall_result != 0) {
+ printk (KERN_ERR "osst%i: Couldn't set vendor name to %s\n", dev,
+ (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], SCSI_DATA_READ, STp->timeout, 0, TRUE);
+ *aSRpnt = SRpnt;
+
+ if ((STp->buffer)->syscall_result != 0) {
+ printk (KERN_ERR "osst%i: can't get capabilities page\n", dev);
+ 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], SCSI_DATA_READ, STp->timeout, 0, TRUE);
+ *aSRpnt = SRpnt;
+
+ if ((STp->buffer)->syscall_result != 0) {
+ printk (KERN_ERR "osst%i: can't get tape parameter page\n", dev);
+ 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 "osst%d: Density %d, tape length: %dMB, drive buffer size: %dKB\n",
+ dev, 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(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt, int forward)
+{
+ int result;
+ int dev = TAPE_NR(STp->devt);
+
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Stepping over filemark %s.\n",
+ dev, 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_ERR "osst%d: Stepping over filemark %s failed.\n",
+ dev, forward ? "forward" : "backward");
+
+ return result;
+}
+
+
+/* Get the tape position. */
+
+static int osst_get_frame_position(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt)
+{
+ unsigned char scmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt;
+ int result = 0;
+
+ /* 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;
+ int dev = TAPE_NR(STp->devt);
+
+ 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, SCSI_DATA_READ,
+ STp->timeout, MAX_READY_RETRIES, TRUE);
+ 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;
+
+ if (result == -EINVAL)
+ printk(KERN_ERR "osst%d: Can't read tape position.\n", dev);
+ else {
+
+ if (result == -EIO) { /* re-read position */
+ 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, SCSI_DATA_READ,
+ STp->timeout, MAX_READY_RETRIES, TRUE);
+ if (!STp->buffer->syscall_result)
+ memcpy (SRpnt->sr_sense_buffer, mysense, 16);
+ }
+ 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 "osst%d: Drive Positions: host %d, tape %d%s, buffer %d\n", dev,
+ 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(KERN_WARNING "osst%d: Correcting read position %d, %d, %d\n", dev,
+ 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(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt, int block, int skip)
+{
+ unsigned char scmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt;
+ ST_partstat * STps;
+ int result = 0;
+ int timeout;
+ int dev = TAPE_NR(STp->devt);
+
+ if (STp->ready != ST_READY) return (-EIO);
+
+ timeout = STp->long_timeout;
+ STps = &(STp->ps[STp->partition]);
+
+ if (block < 0 || block > STp->capacity) {
+ printk(KERN_ERR "osst%d: Reposition request %d out of range\n", dev, block);
+ block = block < 0 ? 0 : (STp->capacity - 1);
+ result = (-EINVAL);
+ }
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Setting block to %d.\n", dev, block);
+#endif
+ memset (scmd, 0, MAX_COMMAND_SIZE);
+ scmd[0] = SEEK_10;
+ scmd[1] = 1;
+ scmd[3] = (block >> 24);
+ scmd[4] = (block >> 16);
+ scmd[5] = (block >> 8);
+ scmd[6] = block;
+ if (skip)
+ scmd[9] = 0x80;
+
+ SRpnt = osst_do_scsi(*aSRpnt, STp, scmd, 0, SCSI_DATA_NONE, timeout, MAX_READY_RETRIES, TRUE);
+ if (!SRpnt)
+ return (-EBUSY);
+ *aSRpnt = SRpnt;
+
+ STp->first_frame_position = STp->last_frame_position = block;
+ STps->eof = ST_NOEOF;
+ if ((STp->buffer)->syscall_result != 0) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: SEEK command failed.\n", dev);
+#endif
+ result = (-EIO);
+ }
+ STps->at_sm = 0;
+ STps->rw = ST_IDLE;
+ STp->logical_blk_in_buffer = 0;
+ 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(OS_Scsi_Tape *STp, Scsi_Request ** aSRpnt, int file_blk)
+{
+ int offset, transfer, blks = 0;
+ int result = 0;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt = *aSRpnt;
+ ST_partstat * STps;
+ int dev = TAPE_NR(STp->devt);
+
+ if ((STp->buffer)->writing) {
+ if (SRpnt == (STp->buffer)->last_SRpnt)
+#if DEBUG
+ { printk(OSST_DEB_MSG
+ "osst%d: aSRpnt points to Scsi_Request that write_behind_check will release -- cleared\n", dev);
+#endif
+ *aSRpnt = SRpnt = NULL;
+#if DEBUG
+ } else if (SRpnt)
+ printk(OSST_DEB_MSG
+ "osst%d: aSRpnt does not point to Scsi_Request that write_behind_check will release -- strange\n", dev);
+#endif
+ osst_write_behind_check(STp);
+ if ((STp->buffer)->syscall_result) {
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Async write error (flush) %x.\n",
+ dev, (STp->buffer)->midlevel_result);
+#endif
+ if ((STp->buffer)->midlevel_result == INT_MAX)
+ return (-ENOSPC);
+ return (-EIO);
+ }
+ }
+
+ result = 0;
+ if (STp->dirty == 1) {
+
+ offset = STp->buffer->buffer_bytes;
+ transfer = OS_FRAME_SIZE;
+ blks = 1;
+
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Flushing %d bytes, Tranfering %d bytes in %d blocks.\n",
+ dev, offset, transfer, blks);
+#endif
+ if (offset < OS_DATA_SIZE)
+ osst_zero_buffer_tail(STp->buffer);
+
+ /* TODO: Error handling! */
+ if (STp->poll)
+ result = osst_wait_frame (STp, aSRpnt, STp->first_frame_position, -50, 120);
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = WRITE_6;
+ cmd[1] = 1;
+ cmd[4] = blks;
+
+ SRpnt = osst_do_scsi(*aSRpnt, STp, cmd, transfer, SCSI_DATA_WRITE,
+ STp->timeout, MAX_WRITE_RETRIES, TRUE);
+ *aSRpnt = SRpnt;
+ if (!SRpnt)
+ return (-EBUSY);
+
+ STps = &(STp->ps[STp->partition]);
+ if ((STp->buffer)->syscall_result != 0) {
+ printk(OSST_DEB_MSG
+ "osst%d: write sense [0]=0x%02x [2]=%02x [12]=%02x [13]=%02x\n",
+ dev, SRpnt->sr_sense_buffer[0], SRpnt->sr_sense_buffer[2],
+ SRpnt->sr_sense_buffer[12], SRpnt->sr_sense_buffer[13]);
+ 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 "osst%d: Error on flush.\n", dev);
+ result = (-EIO);
+ }
+ }
+ STps->drv_block = (-1);
+ }
+ else {
+ if (file_blk && STps->drv_block >= 0)
+ STps->drv_block += blks;
+ STp->first_frame_position += blks;
+ STp->dirty = 0;
+ (STp->buffer)->buffer_bytes = 0;
+ }
+ }
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Exit flush write buffer with code %d\n", dev, result);
+#endif
+ return result;
+}
+
+
+/* Flush the tape buffer. The tape will be positioned correctly unless
+ seek_next is true. */
+static int osst_flush_buffer(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, int seek_next)
+{
+ int backspace, result;
+ OSST_buffer * STbuffer;
+ ST_partstat * STps;
+#if DEBUG
+ int dev = TAPE_NR(STp->devt);
+#endif
+
+ STbuffer = STp->buffer;
+
+ /*
+ * If there was a bus reset, block further access
+ * to this device.
+ */
+ if( STp->device->was_reset )
+ return (-EIO);
+
+ if (STp->ready != ST_READY)
+ return 0;
+
+ STps = &(STp->ps[STp->partition]);
+ if (STps->rw == ST_WRITING) /* Writing */
+ return osst_flush_write_buffer(STp, aSRpnt, 1);
+
+ if (STp->block_size == 0)
+ return 0;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%i: Reached flush (read) buffer\n", dev);
+#endif
+ backspace = ((STp->buffer)->buffer_bytes + (STp->buffer)->read_pointer) / STp->block_size -
+ ((STp->buffer)->read_pointer + STp->block_size - 1 ) / STp->block_size ;
+ (STp->buffer)->buffer_bytes = 0;
+ (STp->buffer)->read_pointer = 0;
+ result = 0;
+ if (!seek_next) {
+ if (STps->eof == ST_FM_HIT) {
+ result = cross_eof(STp, aSRpnt, FALSE); /* Back over the EOF hit */
+ if (!result)
+ STps->eof = ST_NOEOF;
+ else {
+ if (STps->drv_file >= 0)
+ STps->drv_file++;
+ STps->drv_block = 0;
+ }
+ }
+ if (!result && backspace > 0) /* 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;
+}
+
+
+/* Entry points to osst */
+
+/* Write command */
+static ssize_t osst_write(struct file * filp, const char * buf, size_t count, loff_t *ppos)
+{
+ struct inode *inode = filp->f_dentry->d_inode;
+ ssize_t total, retval = 0;
+ ssize_t i, do_count, blks, transfer;
+ int write_threshold;
+ int doing_write = 0;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ const char *b_point;
+ Scsi_Request * SRpnt = NULL;
+ OS_Scsi_Tape * STp;
+ ST_mode * STm;
+ ST_partstat * STps;
+ int dev = TAPE_NR(inode->i_rdev);
+
+ STp = os_scsi_tapes[dev];
+
+ 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 (ppos != &filp->f_pos) {
+ /* "A request was outside the capabilities of the 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->device->was_reset) {
+ retval = (-EIO);
+ goto out;
+ }
+
+#if DEBUG
+ if (!STp->in_use) {
+ printk(OSST_DEB_MSG "osst%d: Incorrect device.\n", dev);
+ 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_WARNING "osst%d: Write (%ld bytes) not multiple of tape block size (32k).\n",
+ dev, (unsigned long)count);
+ retval = (-EINVAL);
+ goto out;
+ }
+
+ if (STp->first_frame_position >= STp->capacity - 164) {
+ printk(KERN_WARNING "osst%d: Write truncated at EOM early warning (frame %d).\n",
+ dev, STp->first_frame_position);
+ retval = (-ENOSPC);
+ goto out;
+ }
+
+ STps = &(STp->ps[STp->partition]);
+
+ if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
+ !osst_int_ioctl(STp, &SRpnt, MTLOCK, 0))
+ STp->door_locked = ST_LOCKED_AUTO;
+
+
+ if (STps->rw == ST_READING) {
+ retval = osst_flush_buffer(STp, &SRpnt, 0);
+ if (retval)
+ goto out;
+ STps->rw = ST_IDLE;
+ }
+ else 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_file == 0 && STps->drv_block == 0)) {
+ STp->wrt_pass_cntr++;
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Allocating next write pass counter: %d\n",
+ dev, STp->wrt_pass_cntr);
+#endif
+ osst_reset_header(STp, &SRpnt);
+ STps->drv_file = STps->drv_block = STp->logical_blk_num = 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) {
+ 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 "osst%d: Cannot write at indeterminate position.\n", dev);
+#endif
+ retval = (-EIO);
+ goto out;
+ }
+ }
+ if (STps->drv_file > 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
+ "osst%d: Overwriting file %d with old write pass counter %d\n",
+ dev, STps->drv_file, STp->wrt_pass_cntr);
+ printk(KERN_WARNING
+ "osst%d: may lead to stale data being accepted on reading back!\n",
+ dev);
+#if DEBUG
+ printk(OSST_DEB_MSG
+ "osst%d: resetting filemark count to %d and last mark ppos to %d\n",
+ dev, STp->filemark_cnt, STp->last_mark_ppos);
+#endif
+ }
+ }
+ STp->fast_open = FALSE;
+ }
+ if (!STp->header_ok) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Write cannot proceed without valid headers\n", dev);
+#endif
+ retval = (-EIO);
+ goto out;
+ }
+
+ if ((STp->buffer)->writing) {
+if (SRpnt) printk(KERN_ERR "osst%d: Not supposed to have SRpnt at line %d\n", dev, __LINE__);
+ osst_write_behind_check(STp);
+ if ((STp->buffer)->syscall_result) {
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Async write error (write) %x.\n", dev,
+ (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) {
+#if 0
+ if (STp->block_size != 0 && (count % STp->block_size) != 0)
+ {retval=(-EIO);goto out;} /* Write must be integral number of blocks */
+#endif
+ write_threshold = 1;
+ }
+ else
+ write_threshold = (STp->buffer)->buffer_blocks * STp->block_size;
+ if (!STm->do_async_writes)
+ write_threshold--;
+
+ total = count;
+
+ if ((!STp-> raw) && (STp->first_frame_position == 0xbae)) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Skipping over config partition.\n", dev);
+#endif
+ if (osst_flush_drive_buffer(STp, &SRpnt) < 0) {
+ retval = (-EIO);
+ goto out;
+ }
+ /* error recovery may have bumped us past the header partition */
+ if (osst_get_frame_position(STp, &SRpnt) < 0xbb8)
+ osst_position_tape_and_confirm(STp, &SRpnt, 0xbb8);
+ }
+
+ if (STp->poll)
+ retval = osst_wait_frame (STp, &SRpnt, STp->first_frame_position, -50, 60);
+ /* TODO: Check for an error ! */
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = WRITE_6;
+ cmd[1] = 1;
+
+ STps->rw = ST_WRITING;
+ STp->write_type = OS_WRITE_DATA;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Writing %d bytes to file %d block %d lblk %d frame %d\n",
+ dev, count, STps->drv_file, STps->drv_block,
+ STp->logical_blk_num, 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;
+ }
+
+ transfer = OS_FRAME_SIZE;
+ blks = 1;
+
+ osst_init_aux(STp, OS_FRAME_TYPE_DATA, STp->logical_blk_num++ );
+
+ cmd[2] = blks >> 16;
+ cmd[3] = blks >> 8;
+ cmd[4] = blks;
+
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, transfer, SCSI_DATA_WRITE,
+ STp->timeout, MAX_WRITE_RETRIES, TRUE);
+ if (!SRpnt) {
+ retval = (STp->buffer)->syscall_result;
+ goto out;
+ }
+
+ if ((STp->buffer)->syscall_result != 0) {
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Error on write:\n", dev);
+#endif
+ if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 &&
+ (SRpnt->sr_sense_buffer[2] & 0x40)) {
+ if ((SRpnt->sr_sense_buffer[0] & 0x80) != 0)
+ transfer = (SRpnt->sr_sense_buffer[3] << 24) |
+ (SRpnt->sr_sense_buffer[4] << 16) |
+ (SRpnt->sr_sense_buffer[5] << 8) |
+ SRpnt->sr_sense_buffer[6];
+ else
+ transfer = 0;
+ transfer *= STp->block_size;
+ 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 "osst%d: EOM with %d bytes unwritten.\n",
+ dev, transfer);
+#endif
+ }
+ else {
+ STps->eof = ST_EOM_ERROR;
+ STps->drv_block = (-1); /* Too cautious? */
+ retval = (-EIO); /* EOM for old data */
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: EOM with lost data.\n", dev);
+#endif
+ }
+ }
+ else {
+ if (osst_write_error_recovery(STp, &SRpnt, 1) == 0) goto ok;
+ STps->drv_block = (-1); /* Too cautious? */
+ retval = (-EIO);
+ }
+
+ (STp->buffer)->buffer_bytes = 0;
+ STp->dirty = 0;
+ if (count < total)
+ retval = total - count;
+ goto out;
+ }
+ STp->first_frame_position++;
+ok:
+ filp->f_pos += do_count;
+ b_point += do_count;
+ count -= do_count;
+ if (STps->drv_block >= 0) {
+ STps->drv_block += blks;
+ }
+ STp->first_frame_position += blks;
+ (STp->buffer)->buffer_bytes = 0;
+ STp->dirty = 0;
+ }
+ if (count != 0) {
+ STp->dirty = 1;
+ i = append_to_buffer(b_point, STp->buffer, count);
+ if (i) {
+ retval = i;
+ goto out;
+ }
+ 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 &&
+ (STp->buffer)->buffer_bytes >= OS_DATA_SIZE) ) {
+ /* 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);
+
+ transfer = OS_FRAME_SIZE;
+ blks = 1;
+
+ osst_init_aux(STp, OS_FRAME_TYPE_DATA, STp->logical_blk_num++ );
+
+ cmd[2] = blks >> 16;
+ cmd[3] = blks >> 8;
+ cmd[4] = blks;
+#if DEBUG
+ STp->write_pending = 1;
+#endif
+
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, transfer, SCSI_DATA_WRITE,
+ STp->timeout, MAX_WRITE_RETRIES, FALSE);
+ if (SRpnt == NULL) {
+ retval = (STp->buffer)->syscall_result;
+ goto out;
+ }
+ }
+// else if (SRpnt != NULL) {
+// scsi_release_request(SRpnt); /* FIXME -- this relesae no longer in st - why? */
+ 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 * buf, size_t count, loff_t *ppos)
+{
+ struct inode * inode = filp->f_dentry->d_inode;
+ ssize_t total, retval = 0;
+ ssize_t i, transfer;
+ int special;
+ OS_Scsi_Tape * STp;
+ ST_mode * STm;
+ ST_partstat * STps;
+ Scsi_Request *SRpnt = NULL;
+ int dev = TAPE_NR(inode->i_rdev);
+
+ STp = os_scsi_tapes[dev];
+
+ 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 (ppos != &filp->f_pos) {
+ /* "A request was outside the capabilities of the 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 "osst%d: Incorrect device.\n", dev);
+ retval = (-EIO);
+ goto out;
+ }
+#endif
+ /* Must have initialized medium */
+ if (!STp->header_ok) {
+ retval = (-EIO);
+ goto out;
+ }
+
+ if ((count % STp->block_size) != 0) {
+ printk(KERN_WARNING "osst%d: Use multiple of %d bytes as block size (%ld requested)\n",
+ dev, STp->block_size, (unsigned long) count);
+ retval = (-EINVAL); /* Read must be integral number of blocks */
+ goto out;
+ }
+
+ if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED &&
+ !osst_int_ioctl(STp, &SRpnt, MTLOCK, 0))
+ 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;
+ }
+
+#if DEBUG
+ if (debugging && STps->eof != ST_NOEOF)
+ printk(OSST_DEB_MSG "osst%d: EOF/EOM flag up (%d). Bytes %d\n", dev,
+ STps->eof, (STp->buffer)->buffer_bytes);
+#endif
+ if ((STp->buffer)->buffer_bytes == 0 &&
+ STps->eof >= ST_EOD_1) {
+ if (STps->eof < ST_EOD) {
+ STps->eof += 1;
+ 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 && !special; ) {
+
+ /* Get new data if the buffer is empty */
+ if ((STp->buffer)->buffer_bytes == 0) {
+ special = osst_get_logical_blk(STp, &SRpnt, STp->logical_blk_num, 0);
+ STp->buffer->buffer_bytes = special ? 0 : OS_DATA_SIZE;
+ STp->buffer->read_pointer = 0;
+ STp->logical_blk_num++; /* block to look for next time */
+ STp->logical_blk_in_buffer = 0;
+ if (special < 0) { /* No need to continue read */
+ retval = special;
+ goto out;
+ }
+ STps->drv_block++;
+ }
+
+ /* 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 "osst%d: EOF up (%d). Left %d, needed %d.\n", dev,
+ STps->eof, (STp->buffer)->buffer_bytes, count - total);
+#endif
+ transfer = (STp->buffer)->buffer_bytes < count - total ?
+ (STp->buffer)->buffer_bytes : count - total;
+ i = from_buffer(STp->buffer, buf, transfer);
+ if (i) {
+ retval = i;
+ goto out;
+ }
+ filp->f_pos += transfer;
+ buf += transfer;
+ total += transfer;
+ }
+
+ } /* 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: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(OS_Scsi_Tape *STp, ST_mode *STm, int dev)
+{
+ printk(KERN_INFO
+"osst%d: Mode %d options: buffer writes: %d, async writes: %d, read ahead: %d\n",
+ dev, STp->current_mode, STm->do_buffer_writes, STm->do_async_writes,
+ STm->do_read_ahead);
+ printk(KERN_INFO
+"osst%d: can bsr: %d, two FMs: %d, fast mteom: %d, auto lock: %d,\n",
+ dev, STp->can_bsr, STp->two_fm, STp->fast_mteom, STp->do_auto_lock);
+ printk(KERN_INFO
+"osst%d: defs for wr: %d, no block limits: %d, partitions: %d, s2 log: %d\n",
+ dev, STm->defaults_for_writes, STp->omit_blklims, STp->can_partitions,
+ STp->scsi2_logical);
+ printk(KERN_INFO
+"osst%d: sysv: %d\n", dev, STm->sysv);
+#if DEBUG
+ printk(KERN_INFO
+ "osst%d: debugging: %d\n",
+ dev, debugging);
+#endif
+}
+
+
+static int osst_set_options(OS_Scsi_Tape *STp, long options)
+{
+ int value;
+ long code;
+ ST_mode *STm;
+ int dev = TAPE_NR(STp->devt);
+
+ STm = &(STp->modes[STp->current_mode]);
+ if (!STm->defined) {
+ memcpy(STm, &(STp->modes[0]), sizeof(ST_mode));
+ modes_defined = TRUE;
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Initialized mode %d definition from mode 0\n",
+ dev, STp->current_mode);
+#endif
+ }
+
+ code = options & MT_ST_OPTIONS;
+ if (code == MT_ST_BOOLEANS) {
+ STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0;
+ STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0;
+ STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0;
+ STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0;
+ STp->two_fm = (options & MT_ST_TWO_FM) != 0;
+ STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0;
+ STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0;
+ STp->can_bsr = (options & MT_ST_CAN_BSR) != 0;
+ STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0;
+ if ((STp->device)->scsi_level >= SCSI_2)
+ STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0;
+ STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0;
+ STm->sysv = (options & MT_ST_SYSV) != 0;
+#if DEBUG
+ debugging = (options & MT_ST_DEBUGGING) != 0;
+#endif
+ osst_log_options(STp, STm, dev);
+ }
+ else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) {
+ value = (code == MT_ST_SETBOOLEANS);
+ if ((options & MT_ST_BUFFER_WRITES) != 0)
+ STm->do_buffer_writes = value;
+ if ((options & MT_ST_ASYNC_WRITES) != 0)
+ STm->do_async_writes = value;
+ if ((options & MT_ST_DEF_WRITES) != 0)
+ STm->defaults_for_writes = value;
+ if ((options & MT_ST_READ_AHEAD) != 0)
+ STm->do_read_ahead = value;
+ if ((options & MT_ST_TWO_FM) != 0)
+ STp->two_fm = value;
+ if ((options & MT_ST_FAST_MTEOM) != 0)
+ STp->fast_mteom = value;
+ if ((options & MT_ST_AUTO_LOCK) != 0)
+ STp->do_auto_lock = value;
+ if ((options & MT_ST_CAN_BSR) != 0)
+ STp->can_bsr = value;
+ if ((options & MT_ST_NO_BLKLIMS) != 0)
+ STp->omit_blklims = value;
+ if ((STp->device)->scsi_level >= SCSI_2 &&
+ (options & MT_ST_CAN_PARTITIONS) != 0)
+ STp->can_partitions = value;
+ if ((options & MT_ST_SCSI2LOGICAL) != 0)
+ STp->scsi2_logical = value;
+ if ((options & MT_ST_SYSV) != 0)
+ STm->sysv = value;
+#if DEBUG
+ if ((options & MT_ST_DEBUGGING) != 0)
+ debugging = value;
+#endif
+ osst_log_options(STp, STm, dev);
+ }
+ else if (code == MT_ST_WRITE_THRESHOLD) {
+ value = (options & ~MT_ST_OPTIONS) * ST_KILOBYTE;
+ if (value < 1 || value > osst_buffer_size) {
+ printk(KERN_WARNING "osst%d: Write threshold %d too small or too large.\n",
+ dev, value);
+ return (-EIO);
+ }
+ STp->write_threshold = value;
+ printk(KERN_INFO "osst%d: Write threshold set to %d bytes.\n",
+ dev, value);
+ }
+ else if (code == MT_ST_DEF_BLKSIZE) {
+ value = (options & ~MT_ST_OPTIONS);
+ if (value == ~MT_ST_OPTIONS) {
+ STm->default_blksize = (-1);
+ printk(KERN_INFO "osst%d: Default block size disabled.\n", dev);
+ }
+ else {
+ STm->default_blksize = value;
+ printk(KERN_INFO "osst%d: Default block size set to %d bytes.\n",
+ dev, STm->default_blksize);
+ }
+ }
+ else if (code == MT_ST_TIMEOUTS) {
+ value = (options & ~MT_ST_OPTIONS);
+ if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) {
+ STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ;
+ printk(KERN_INFO "osst%d: Long timeout set to %d seconds.\n", dev,
+ (value & ~MT_ST_SET_LONG_TIMEOUT));
+ }
+ else {
+ STp->timeout = value * HZ;
+ printk(KERN_INFO "osst%d: Normal timeout set to %d seconds.\n", dev, value);
+ }
+ }
+ else if (code == MT_ST_DEF_OPTIONS) {
+ code = (options & ~MT_ST_CLEAR_DEFAULT);
+ value = (options & MT_ST_CLEAR_DEFAULT);
+ if (code == MT_ST_DEF_DENSITY) {
+ if (value == MT_ST_CLEAR_DEFAULT) {
+ STm->default_density = (-1);
+ printk(KERN_INFO "osst%d: Density default disabled.\n", dev);
+ }
+ else {
+ STm->default_density = value & 0xff;
+ printk(KERN_INFO "osst%d: Density default set to %x\n",
+ dev, STm->default_density);
+ }
+ }
+ else if (code == MT_ST_DEF_DRVBUFFER) {
+ if (value == MT_ST_CLEAR_DEFAULT) {
+ STp->default_drvbuffer = 0xff;
+ printk(KERN_INFO "osst%d: Drive buffer default disabled.\n", dev);
+ }
+ else {
+ STp->default_drvbuffer = value & 7;
+ printk(KERN_INFO "osst%d: Drive buffer default set to %x\n",
+ dev, STp->default_drvbuffer);
+ }
+ }
+ else if (code == MT_ST_DEF_COMPRESSION) {
+ if (value == MT_ST_CLEAR_DEFAULT) {
+ STm->default_compression = ST_DONT_TOUCH;
+ printk(KERN_INFO "osst%d: Compression default disabled.\n", dev);
+ }
+ else {
+ STm->default_compression = (value & 1 ? ST_YES : ST_NO);
+ printk(KERN_INFO "osst%d: Compression default set to %x\n",
+ dev, (value & 1));
+ }
+ }
+ }
+ else
+ return (-EIO);
+
+ return 0;
+}
+
+
+/* Internal ioctl function */
+static int osst_int_ioctl(OS_Scsi_Tape * STp, Scsi_Request ** aSRpnt, unsigned int cmd_in, unsigned long arg)
+{
+ int timeout;
+ long ltmp;
+ int i, ioctl_result;
+ int chg_eof = TRUE;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt = * aSRpnt;
+ ST_partstat * STps;
+ int fileno, blkno, at_sm, logical_blk_num;
+ int datalen = 0, direction = SCSI_DATA_NONE;
+ int dev = TAPE_NR(STp->devt);
+
+ 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;
+ logical_blk_num = STp->logical_blk_num;
+
+ memset(cmd, 0, MAX_COMMAND_SIZE);
+ switch (cmd_in) {
+ case MTFSFM:
+ chg_eof = FALSE; /* 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);
+ logical_blk_num = STp->logical_blk_num;
+ if (fileno >= 0)
+ fileno += arg;
+ blkno = 0;
+ at_sm &= (arg == 0);
+ goto os_bypass;
+
+ case MTBSF:
+ chg_eof = FALSE; /* 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);
+ logical_blk_num = STp->logical_blk_num;
+ 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 "osst%i: Skipping %lu blocks %s from logical block %d\n",
+ dev, 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-1);
+ STp->logical_blk_in_buffer = 0;
+ 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 "osst%d: Spacing tape forward %d setmarks.\n", dev,
+ cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
+#endif
+ if (arg != 0) {
+ blkno = fileno = (-1);
+ at_sm = 1;
+ }
+ break;
+ case MTBSS:
+ cmd[0] = SPACE;
+ cmd[1] = 0x04; /* Space Setmarks */ /* 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 "osst%d: Spacing tape backward %ld setmarks.\n",
+ dev, (-ltmp));
+ }
+#endif
+ if (arg != 0) {
+ blkno = fileno = (-1);
+ at_sm = 1;
+ }
+ break;
+ case MTWEOF:
+ if ( STps->rw == ST_WRITING && !(STp->device)->was_reset)
+ ioctl_result = osst_flush_write_buffer(STp, &SRpnt, 1);
+ else
+ ioctl_result = 0;
+ for (i=0; i<arg; i++)
+ ioctl_result |= osst_write_filemark(STp, &SRpnt);
+ logical_blk_num = STp->logical_blk_num;
+ 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) {
+ if (cmd_in == MTWEOF)
+ printk(OSST_DEB_MSG "osst%d: Writing %d filemarks.\n", dev,
+ cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
+ else
+ printk(OSST_DEB_MSG "osst%d: Writing %d setmarks.\n", dev,
+ cmd[2] * 65536 + cmd[3] * 256 + cmd[4]);
+ }
+#endif
+ if (fileno >= 0)
+ fileno += arg;
+ blkno = 0;
+ at_sm = (cmd_in == MTWSM);
+ break;
+ case MTOFFL:
+ case MTLOAD:
+ case MTUNLOAD:
+ case MTRETEN:
+ cmd[0] = START_STOP;
+ cmd[1] = 1; /* Don't wait for completion */
+ if (cmd_in == MTLOAD)
+ 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 "osst%d: Unloading tape.\n", dev);
+ break;
+ case MTLOAD:
+ printk(OSST_DEB_MSG "osst%d: Loading tape.\n", dev);
+ break;
+ case MTRETEN:
+ printk(OSST_DEB_MSG "osst%d: Retensioning tape.\n", dev);
+ break;
+ case MTOFFL:
+ printk(OSST_DEB_MSG "osst%d: Ejecting tape.\n", dev);
+ break;
+ }
+ }
+#endif
+ fileno = blkno = at_sm = logical_blk_num = 0 ;
+ break;
+ case MTNOP:
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: No op on tape.\n", dev);
+#endif
+ return 0; /* Should do something ? */
+ break;
+ case MTEOM:
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Spacing to end of recorded medium.\n", dev);
+#endif
+ osst_set_frame_position(STp, &SRpnt, STp->eod_frame_ppos, 0);
+ if (osst_get_logical_blk(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 "osst%d: No EOD frame found where expected.\n", dev);
+#endif
+ ioctl_result = -EIO;
+ goto os_bypass;
+ }
+ ioctl_result = osst_set_frame_position(STp, &SRpnt, STp->eod_frame_ppos, 0);
+ logical_blk_num = STp->logical_blk_num;
+ 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 = logical_blk_num = 0 ;
+ goto os_bypass;
+
+ case MTREW:
+ cmd[0] = REZERO_UNIT; /* rewind */
+ cmd[1] = 1;
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Rewinding tape, Immed=%d.\n", dev, cmd[1]);
+#endif
+ fileno = blkno = at_sm = logical_blk_num = 0 ;
+ break;
+
+ case MTLOCK:
+ chg_eof = FALSE;
+ cmd[0] = ALLOW_MEDIUM_REMOVAL;
+ cmd[4] = SCSI_REMOVAL_PREVENT;
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Locking drive door.\n", dev);
+#endif;
+ break;
+
+ case MTUNLOCK:
+ chg_eof = FALSE;
+ cmd[0] = ALLOW_MEDIUM_REMOVAL;
+ cmd[4] = SCSI_REMOVAL_ALLOW;
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Unlocking drive door.\n", dev);
+#endif;
+ break;
+
+ case MTSETBLK: /* Set block length */
+ case MTSETDENSITY: /* Set tape density */
+ case MTSETDRVBUFFER: /* Set drive buffering */
+ case SET_DENS_AND_BLK: /* Set density and block size */
+ chg_eof = FALSE;
+ if (STp->dirty || (STp->buffer)->buffer_bytes != 0)
+ return (-EIO); /* Not allowed if data in buffer */
+ if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) &&
+ (arg & MT_ST_BLKSIZE_MASK) != 0 &&
+ ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block ||
+ (arg & MT_ST_BLKSIZE_MASK) > STp->max_block ||
+ (arg & MT_ST_BLKSIZE_MASK) > osst_buffer_size)) {
+ printk(KERN_WARNING "osst%d: Illegal block size.\n", dev);
+ return (-EINVAL);
+ }
+ return 0; /* silently ignore if block size didn't change */
+
+ default:
+ return (-ENOSYS);
+ }
+
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, datalen, direction, timeout, MAX_RETRIES, TRUE);
+
+ ioctl_result = (STp->buffer)->syscall_result;
+
+ if (!SRpnt) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Couldn't exec scsi cmd for IOCTL\n", dev);
+#endif
+ return ioctl_result;
+ }
+
+os_bypass:
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: IOCTL (%d) Result=%d\n", dev, cmd_in, ioctl_result);
+#endif
+
+ if (!ioctl_result) { /* SCSI command successful */
+
+ 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;
+ STp->logical_blk_num = logical_blk_num;
+
+ if (cmd_in == MTLOCK)
+ STp->door_locked = ST_LOCKED_EXPLICIT;
+ else if (cmd_in == MTUNLOCK)
+ STp->door_locked = ST_UNLOCKED;
+
+ if (cmd_in == MTEOM)
+ STps->eof = ST_EOD;
+ 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) {
+/* STp->rew_at_close = (MINOR(inode->i_rdev) & 0x80) == 0; FIXME */
+ for (i=0; i < ST_NBR_PARTITIONS; i++) {
+ STp->ps[i].rw = ST_IDLE;
+ STp->ps[i].last_block_valid = FALSE;
+ }
+ 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 == MTLOCK)
+ STp->door_locked = ST_LOCK_FAILS;
+
+ }
+ *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, need_dma_buffer, new_session = FALSE, retval = 0;
+ unsigned char cmd[MAX_COMMAND_SIZE];
+ Scsi_Request * SRpnt;
+ OS_Scsi_Tape * STp;
+ ST_mode * STm;
+ ST_partstat * STps;
+ int dev = TAPE_NR(inode->i_rdev);
+ int mode = TAPE_MODE(inode->i_rdev);
+
+ if (dev >= osst_template.dev_max || (STp = os_scsi_tapes[dev]) == NULL || !STp->device)
+ return (-ENXIO);
+
+ if( !scsi_block_when_processing_errors(STp->device) ) {
+ return -ENXIO;
+ }
+
+ if (STp->in_use) {
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Device already in use.\n", dev);
+#endif
+ return (-EBUSY);
+ }
+ STp->in_use = 1;
+ STp->rew_at_close = (MINOR(inode->i_rdev) & 0x80) == 0;
+
+ if (STp->device->host->hostt->module)
+ __MOD_INC_USE_COUNT(STp->device->host->hostt->module);
+ if (osst_template.module)
+ __MOD_INC_USE_COUNT(osst_template.module);
+
+ if (mode != STp->current_mode) {
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Mode change from %d to %d.\n",
+ dev, STp->current_mode, mode);
+#endif
+ new_session = TRUE;
+ STp->current_mode = mode;
+ }
+ STm = &(STp->modes[STp->current_mode]);
+
+ flags = filp->f_flags;
+ STp->write_prot = ((flags & O_ACCMODE) == O_RDONLY);
+
+ STp->raw = (MINOR(inode->i_rdev) & 0x40) != 0;
+
+ /* Allocate a buffer for this user */
+ need_dma_buffer = STp->restr_dma;
+ for (i=0; i < osst_nbr_buffers; i++)
+ if (!osst_buffers[i]->in_use &&
+ (!need_dma_buffer || osst_buffers[i]->dma))
+ break;
+ if (i >= osst_nbr_buffers) {
+ STp->buffer = new_tape_buffer(FALSE, need_dma_buffer);
+ if (STp->buffer == NULL) {
+ printk(KERN_WARNING "osst%d: Can't allocate tape buffer.\n", dev);
+ retval = (-EBUSY);
+ goto err_out;
+ }
+ }
+ else
+ STp->buffer = osst_buffers[i];
+ (STp->buffer)->in_use = 1;
+ (STp->buffer)->writing = 0;
+ (STp->buffer)->syscall_result = 0;
+ (STp->buffer)->use_sg = STp->device->host->sg_tablesize;
+
+ /* Compute the usable buffer size for this SCSI adapter */
+ if (!(STp->buffer)->use_sg)
+ (STp->buffer)->buffer_size = (STp->buffer)->sg[0].length;
+ else {
+ for (i=0, (STp->buffer)->buffer_size = 0; i < (STp->buffer)->use_sg &&
+ i < (STp->buffer)->sg_segs; i++)
+ (STp->buffer)->buffer_size += (STp->buffer)->sg[i].length;
+ }
+
+ STp->dirty = 0;
+ for (i=0; i < ST_NBR_PARTITIONS; i++) {
+ STps = &(STp->ps[i]);
+ STps->rw = ST_IDLE;
+ }
+ STp->ready = ST_READY;
+ STp->recover_count = 0;
+#if DEBUG
+ STp->nbr_waits = STp->nbr_finished = 0;
+#endif
+
+ memset (cmd, 0, MAX_COMMAND_SIZE);
+ cmd[0] = TEST_UNIT_READY;
+
+ SRpnt = osst_do_scsi(NULL, STp, cmd, 0, SCSI_DATA_NONE, STp->timeout, MAX_READY_RETRIES, TRUE);
+ if (!SRpnt) {
+ retval = (STp->buffer)->syscall_result;
+ 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 "osst%d: Unit not ready, cause %x\n", dev, SRpnt->sr_sense_buffer[13]);
+#endif
+ 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, SCSI_DATA_NONE,
+ STp->timeout, MAX_READY_RETRIES, TRUE);
+ }
+ osst_wait_ready(STp, &SRpnt, (SRpnt->sr_sense_buffer[13]==1?15:3) * 60);
+ }
+ if ((SRpnt->sr_sense_buffer[0] & 0x70) == 0x70 &&
+ (SRpnt->sr_sense_buffer[2] & 0x0f) == UNIT_ATTENTION) { /* New media? */
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: Unit wants attention\n", dev);
+#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, SCSI_DATA_NONE,
+ STp->timeout, MAX_READY_RETRIES, TRUE);
+ if ((SRpnt->sr_sense_buffer[0] & 0x70) != 0x70 ||
+ (SRpnt->sr_sense_buffer[2] & 0x0f) != UNIT_ATTENTION)
+ break;
+ }
+
+ STp->device->was_reset = 0;
+ STp->partition = STp->new_partition = 0;
+ if (STp->can_partitions)
+ STp->nbr_partitions = 1; /* This guess will be updated later if necessary */
+ for (i=0; i < ST_NBR_PARTITIONS; i++) {
+ STps = &(STp->ps[i]);
+ STps->rw = ST_IDLE;
+ STps->eof = ST_NOEOF;
+ STps->at_sm = 0;
+ STps->last_block_valid = FALSE;
+ STps->drv_block = 0;
+ STps->drv_file = 0 ;
+ }
+ new_session = TRUE;
+ }
+ /*
+ * if 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], SCSI_DATA_READ, STp->timeout, 0, TRUE);
+
+ 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 "osst%d: signature was changed to %c%c%c%c\n", dev,
+ 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 (osst_int_ioctl(STp, &SRpnt, MTLOCK, 0))
+ printk(KERN_WARNING "osst%d: Can't lock drive door\n", dev);
+ else
+ STp->door_locked = ST_LOCKED_AUTO;
+ }
+ STp->fast_open = TRUE;
+ scsi_release_request(SRpnt);
+ return 0;
+ }
+#if DEBUG
+ if (i != STp->first_frame_position)
+ printk(OSST_DEB_MSG "osst%d: tape position changed from %d to %d\n",
+ dev, i, STp->first_frame_position);
+#endif
+ STp->header_ok = 0;
+ }
+ STp->fast_open = FALSE;
+
+ 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 1 //DEBUG
+ printk(OSST_DEB_MSG "osst%i: Applying soft reset\n", dev);
+#endif
+ SRpnt = osst_do_scsi(SRpnt, STp, cmd, cmd[4], SCSI_DATA_WRITE, STp->timeout, 0, TRUE);
+
+ 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, SCSI_DATA_NONE,
+ STp->timeout, MAX_READY_RETRIES, TRUE);
+ 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->device->was_reset = 0;
+ STp->partition = STp->new_partition = 0;
+ if (STp->can_partitions)
+ STp->nbr_partitions = 1; /* This guess will be updated later if necessary */
+ for (i=0; i < ST_NBR_PARTITIONS; i++) {
+ STps = &(STp->ps[i]);
+ STps->rw = ST_IDLE;
+ STps->eof = ST_NOEOF;
+ STps->at_sm = 0;
+ STps->last_block_valid = FALSE;
+ STps->drv_block = 0;
+ STps->drv_file = 0 ;
+ }
+ new_session = TRUE;
+ }
+ }
+ }
+
+ if (osst_wait_ready(STp, &SRpnt, 15 * 60)) /* FIXME - not allowed with NOBLOCK */
+ printk(KERN_WARNING "osst%i: Device did not become Ready in open\n",dev);
+
+ 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;
+ }
+
+ STp->min_block = STp->max_block = (-1);
+
+ osst_configure_onstream(STp, &SRpnt);
+
+/* STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; FIXME */
+
+ if (OS_FRAME_SIZE > (STp->buffer)->buffer_size &&
+ !enlarge_buffer(STp->buffer, OS_FRAME_SIZE, STp->restr_dma)) {
+ printk(KERN_NOTICE "osst%d: Framesize %d too large for buffer.\n", dev,
+ OS_FRAME_SIZE);
+ retval = (-EIO);
+ 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 *) (STp->buffer->sg[i].address + OS_DATA_SIZE - b_size);
+#if DEBUG
+ printk(OSST_DEB_MSG "osst%d: b_data points to %p in segment 0 at %p\n", dev,
+ STp->buffer->b_data, STp->buffer->sg[0].address);
+ printk(OSST_DEB_MSG "osst%d: AUX points to %p in segment %d at %p\n", dev,
+ STp->buffer->aux, i, STp->buffer->sg[i].address);
+#endif
+ } else
+ STp->buffer->aux = NULL; /* this had better never happen! */
+
+ (STp->buffer)->buffer_blocks = 1;
+ (STp->buffer)->buffer_bytes =
+ (STp->buffer)->read_pointer =
+ STp->logical_blk_in_buffer = 0;
+
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Block size: %d, frame size: %d, buffer size: %d (%d blocks).\n",
+ dev, 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 "osst%d: Write protected\n", dev);
+#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 "osst%d: New Session\n", dev);
+#endif
+ STp->density_changed = STp->blksize_changed = FALSE;
+ STp->compression_changed = FALSE;
+ }
+
+ /*
+ * properly position the tape and check the ADR headers
+ */
+ if (STp->door_locked == ST_UNLOCKED) {
+ if (osst_int_ioctl(STp, &SRpnt, MTLOCK, 0))
+ printk(KERN_WARNING "osst%d: Can't lock drive door\n", dev);
+ 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);
+ if (STp->buffer != NULL) {
+ STp->buffer->in_use = 0;
+ STp->buffer = NULL;
+ }
+ STp->in_use = 0;
+
+ if (STp->device->host->hostt->module)
+ __MOD_DEC_USE_COUNT(STp->device->host->hostt->module);
+ if (osst_template.module)
+ __MOD_DEC_USE_COUNT(osst_template.module);
+
+ return retval;
+}
+
+
+/* Flush the tape buffer before close */
+static int os_scsi_tape_flush(struct file * filp)
+{
+ int result = 0, result2;
+ OS_Scsi_Tape * STp;
+ ST_mode * STm;
+ ST_partstat * STps;
+ Scsi_Request *SRpnt = NULL;
+
+ struct inode *inode = filp->f_dentry->d_inode;
+ kdev_t devt = inode->i_rdev;
+ int dev;
+
+ if (file_count(filp) > 1)
+ return 0;
+
+ dev = TAPE_NR(devt);
+ STp = os_scsi_tapes[dev];
+ STm = &(STp->modes[STp->current_mode]);
+ STps = &(STp->ps[STp->partition]);
+
+ if ( STps->rw == ST_WRITING && !(STp->device)->was_reset) {
+ result = osst_flush_write_buffer(STp, &SRpnt, 1);
+ if (result != 0 && result != (-ENOSPC))
+ goto out;
+ }
+
+ if ( STps->rw == ST_WRITING && !(STp->device)->was_reset) {
+
+#if DEBUG
+ if (debugging) {
+ printk(OSST_DEB_MSG "osst%d: File length %ld bytes.\n",
+ dev, (long)(filp->f_pos));
+ printk(OSST_DEB_MSG "osst%d: Async write waits %d, finished %d.\n",
+ dev, STp->nbr_waits, STp->nbr_finished);
+ }
+#endif
+
+ result = osst_flush_drive_buffer(STp, &SRpnt);
+ if (result < 0) goto out;
+ result = osst_write_filemark(STp, &SRpnt);
+ if (result < 0) goto out;
+
+ if (STps->drv_file >= 0)
+ STps->drv_file++ ;
+ STps->drv_block = 0;
+
+ result = osst_write_eod(STp, &SRpnt);
+ osst_write_header(STp, &SRpnt, !(STp->rew_at_close));
+
+ STps->eof = ST_FM;
+
+#if DEBUG
+ if (debugging)
+ printk(OSST_DEB_MSG "osst%d: Buffer flushed, %d EOF(s) written\n",
+ dev, 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);
+ else if (STps->eof == ST_FM_HIT) {
+ result = cross_eof(STp, &SRpnt, FALSE);
+ if (result) {
+ if (STps->drv_file >= 0)
+ STps->drv_file++;
+ STps->drv_block = 0;
+ STps->eof = ST_FM;
+ }
+ else
+ STps->eof = ST_NOEOF;
+ }
+ }
+ else if ((STps->eof == ST_NOEOF &&
+ !(result = cross_eof(STp, &SRpnt, TRUE))) ||
+ STps->eof == ST_FM_HIT) {
+ if (STps->drv_file >= 0)
+ STps->drv_file++;
+ STps->drv_block = 0;
+ STps->eof = ST_FM;
+ }
+ }
+
+out:
+ if (STp->rew_at_close) {
+ result2 = osst_position_tape_and_confirm(STp, &SRpnt, STp->first_data_ppos);
+ STps->drv_file = STps->drv_block = STp->logical_blk_num = 0;
+ if (result == 0)
+ result = result2;
+ }
+ if (SRpnt) scsi_release_request(SRpnt);
+
+ return result;
+}
+
+
+/* Close the device and release it */
+static int os_scsi_tape_close(struct inode * inode, struct file * filp)
+{
+ int result = 0;
+ OS_Scsi_Tape * STp;
+ Scsi_Request * SRpnt = NULL;
+
+ kdev_t devt = inode->i_rdev;
+ int dev;
+
+ dev = TAPE_NR(devt);
+ STp = os_scsi_tapes[dev];
+
+ if (STp->door_locked == ST_LOCKED_AUTO)
+ osst_int_ioctl(STp, &SRpnt, MTUNLOCK, 0);
+ if (SRpnt) scsi_release_request(SRpnt);
+
+ if (STp->buffer != NULL)
+ STp->buffer->in_use = 0;
+
+ STp->in_use = 0;
+ if (STp->device->host->hostt->module)
+ __MOD_DEC_USE_COUNT(STp->device->host->hostt->module);
+ if(osst_template.module)
+ __MOD_DEC_USE_COUNT(osst_template.module);
+
+ 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;
+ OS_Scsi_Tape *STp;
+ ST_mode *STm;
+ ST_partstat *STps;
+ Scsi_Request *SRpnt = NULL;
+ int dev = TAPE_NR(inode->i_rdev);
+
+ STp = os_scsi_tapes[dev];
+
+ if (down_interruptible(&STp->lock))
+ return -ERESTARTSYS;
+
+#if DEBUG
+ if (debugging && !STp->in_use) {
+ printk(OSST_DEB_MSG "osst%d: Incorrect device.\n", dev);
+ 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 (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) {
+ struct mtop mtc;
+
+ if (_IOC_SIZE(cmd_in) != sizeof(mtc)) {
+ retval = (-EINVAL);
+ goto out;
+ }
+
+ i = copy_from_user((char *) &mtc, (char *)arg, sizeof(struct mtop));
+ if (i) {
+ retval = (-EFAULT);
+ goto out;
+ }
+
+ if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) {
+ printk(KERN_WARNING "osst%d: MTSETDRVBUFFER only allowed for root.\n", dev);
+ retval = (-EPERM);
+ goto out;
+ }
+
+ if (!STm->defined && (mtc.mt_op != MTSETDRVBUFFER && (mtc.mt_count & MT_ST_OPTIONS) == 0)) {
+ retval = (-ENXIO);
+ goto out;
+ }
+
+ if (!(STp->device)->was_reset) {
+
+ if (STps->eof == ST_FM_HIT) {
+ if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM|| mtc.mt_op == MTEOM) {
+ mtc.mt_count -= 1;
+ if (STps->drv_file >= 0)
+ STps->drv_file += 1;
+ }
+ else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) {
+ mtc.mt_count += 1;
+ if (STps->drv_file >= 0)
+ STps->drv_file += 1;
+ }
+ }
+
+ if (mtc.mt_op == MTSEEK) {
+ /* Old position must be restored if partition will be changed */
+ i = !STp->can_partitions || (STp->new_partition != STp->partition);
+ }
+ else {
+ i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL ||
+ mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM ||
+ mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD ||
+ mtc.mt_op == MTCOMPRESSION;
+ }
+ i = 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;
+ }
+ STp->device->was_reset = 0;
+ if (STp->door_locked != ST_UNLOCKED &&
+ STp->door_locked != ST_LOCK_FAILS) {
+ if (osst_int_ioctl(STp, &SRpnt, MTLOCK, 0)) {
+ printk(KERN_NOTICE "osst%d: Could not relock door after bus reset.\n",
+ dev);
+ STp->door_locked = ST_UNLOCKED;
+ }
+ }
+ }
+
+ if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK &&
+ mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM &&
+ mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART)
+ STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */
+
+ if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED)
+ osst_int_ioctl(STp, &SRpnt, MTUNLOCK, 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 (!STp->can_partitions ||
+ mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS)
+ return (-EINVAL);
+ if (mtc.mt_count >= STp->nbr_partitions &&
+ (STp->nbr_partitions = nbr_partitions(inode)) < 0)
+ return (-EIO);*/
+ if (mtc.mt_count >= STp->nbr_partitions)
+ 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 = FALSE;
+ }
+ 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) {
+ i = osst_seek_frame(STp, &SRpnt, mtc.mt_count);
+ if (!STp->can_partitions)
+ STp->ps[0].rw = ST_IDLE;
+ retval = i;
+ goto out;
+ }
+
+/* if (STp->can_partitions && STp->ready == ST_READY &&
+ (i = update_partition(inode)) < 0)
+ {retval=i;goto out;}*/
+
+ if (mtc.mt_op == MTCOMPRESSION)
+ retval = -EINVAL /*osst_compression(STp, (mtc.mt_count & 1))*/;
+ else
+
+ 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, FALSE)) < 0) {
+ retval = i;
+ goto out;
+ }
+
+/* if (STp->can_partitions &&
+ (i = update_partition(inode)) < 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((char *)arg, (char *)&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;
+ }
+ blk = osst_get_frame_position(STp, &SRpnt);
+ if (blk < 0) {
+ retval = blk;
+ goto out;
+ }
+ mt_pos.mt_blkno = blk;
+ i = copy_to_user((char *)arg, (char *) (&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, (void *) arg);
+
+out:
+ if (SRpnt) scsi_release_request(SRpnt);
+
+ up(&STp->lock);
+
+ return retval;
+}
+
+
+/* Memory handling routines */
+
+/* Try to allocate a new tape buffer */
+static OSST_buffer * new_tape_buffer( int from_initialization, int need_dma )
+{
+ int i, priority, b_size, order, got = 0, segs = 0;
+ OSST_buffer *tb;
+
+ if (osst_nbr_buffers >= osst_template.dev_max)
+ return NULL; /* Should never happen */
+
+ if (from_initialization)
+ priority = GFP_ATOMIC;
+ else
+ priority = GFP_KERNEL;
+
+ i = sizeof(OSST_buffer) + (osst_max_sg_segs - 1) * sizeof(struct scatterlist);
+ tb = (OSST_buffer *)kmalloc(i, priority);
+ if (tb) {
+// tb->this_size = i;
+ if (need_dma)
+ priority |= GFP_DMA;
+
+ /* Try to allocate the first segment up to OSST_FIRST_ORDER and the
+ others big enough to reach the goal */
+ for (b_size = PAGE_SIZE, order = 0;
+ b_size < osst_buffer_size && order < OSST_FIRST_ORDER;
+ b_size *= 2, order++ );
+
+ for ( ; b_size >= PAGE_SIZE; order--, b_size /= 2) {
+ tb->sg[0].address =
+ (unsigned char *)__get_free_pages(priority, order);
+ if (tb->sg[0].address != NULL) {
+ tb->sg[0].alt_address = NULL;
+ tb->sg[0].length = b_size;
+ break;
+ }
+ }
+ if (tb->sg[segs].address == NULL) {
+ kfree(tb);
+ tb = NULL;
+ }
+ else { /* Got something, continue */
+
+ for (b_size = PAGE_SIZE, order = 0;
+ osst_buffer_size > tb->sg[0].length + (OSST_FIRST_SG - 1) * b_size;
+ b_size *= 2, order++ );
+
+ for (segs=1, got=tb->sg[0].length;
+ got < osst_buffer_size && segs < OSST_FIRST_SG; ) {
+ tb->sg[segs].address =
+ (unsigned char *)__get_free_pages(priority, order);
+ if (tb->sg[segs].address == NULL) {
+ if (osst_buffer_size - got <=
+ (OSST_FIRST_SG - segs) * b_size / 2) {
+ b_size /= 2; /* Large enough for the rest of the buffers */
+ order--;
+ continue;
+ }
+ tb->sg_segs = segs;
+ tb->orig_sg_segs = 0;
+#if DEBUG
+ tb->buffer_size = got;
+#endif
+ normalize_buffer(tb);
+ kfree(tb);
+ tb = NULL;
+ break;
+ }
+ tb->sg[segs].alt_address = NULL;
+ tb->sg[segs].length = b_size;
+ got += b_size;
+ segs++;
+ }
+ }
+ }
+ if (!tb) {
+ printk(KERN_NOTICE "osst: Can't allocate new tape buffer (nbr %d).\n",
+ osst_nbr_buffers);
+ return NULL;
+ }
+ tb->sg_segs = tb->orig_sg_segs = segs;
+ tb->b_data = tb->sg[0].address;
+
+#if DEBUG
+ if (debugging) {
+ printk(OSST_DEB_MSG
+ "osst: Allocated tape buffer %d (%d bytes, %d segments, dma: %d, a: %p).\n",
+ osst_nbr_buffers, got, tb->sg_segs, need_dma, tb->b_data);
+ printk(OSST_DEB_MSG
+ "osst: segment sizes: first %d, last %d bytes.\n",
+ tb->sg[0].length, tb->sg[segs-1].length);
+ }
+#endif
+ tb->in_use = 0;
+ tb->dma = need_dma;
+ tb->buffer_size = got;
+ tb->writing = 0;
+ osst_buffers[osst_nbr_buffers++] = tb;
+
+ return tb;
+}
+
+
+/* Try to allocate a temporary enlarged tape buffer */
+static int enlarge_buffer(OSST_buffer *STbuffer, int new_size, int need_dma)
+{
+ int segs, nbr, max_segs, b_size, priority, order, got;
+
+ normalize_buffer(STbuffer);
+
+ max_segs = STbuffer->use_sg;
+ if (max_segs > osst_max_sg_segs)
+ max_segs = osst_max_sg_segs;
+ nbr = max_segs - STbuffer->sg_segs;
+ if (nbr <= 0)
+ return FALSE;
+
+ priority = GFP_KERNEL;
+ if (need_dma)
+ priority |= GFP_DMA;
+ for (b_size = PAGE_SIZE, order = 0;
+ b_size * nbr < new_size - STbuffer->buffer_size;
+ b_size *= 2, order++);
+
+ for (segs=STbuffer->sg_segs, got=STbuffer->buffer_size;
+ segs < max_segs && got < new_size; ) {
+ STbuffer->sg[segs].address =
+ (unsigned char *)__get_free_pages(priority, order);
+ if (STbuffer->sg[segs].address == NULL) {
+ if (new_size - got <= (max_segs - segs) * b_size / 2) {
+ b_size /= 2; /* Large enough for the rest of the buffers */
+ order--;
+ continue;
+ }
+ printk(KERN_NOTICE "osst: Failed to enlarge buffer to %d bytes.\n",
+ new_size);
+#if DEBUG
+ STbuffer->buffer_size = got;
+#endif
+ normalize_buffer(STbuffer);
+ return FALSE;
+ }
+ STbuffer->sg[segs].alt_address = NULL;
+ STbuffer->sg[segs].length = b_size;
+ STbuffer->sg_segs += 1;
+ got += b_size;
+ STbuffer->buffer_size = got;
+ segs++;
+ }
+#if DEBUG
+ if (debugging) {
+ for (nbr=0; osst_buffers[nbr] != STbuffer && nbr < osst_nbr_buffers; nbr++);
+ printk(OSST_DEB_MSG
+ "osst: Expanded tape buffer %d (%d bytes, %d->%d segments, dma: %d, a: %p).\n",
+ nbr, got, STbuffer->orig_sg_segs, STbuffer->sg_segs, need_dma, STbuffer->b_data);
+ printk(OSST_DEB_MSG
+ "osst: segment sizes: first %d, last %d bytes.\n",
+ STbuffer->sg[0].length, STbuffer->sg[segs-1].length);
+ }
+#endif
+
+ return TRUE;
+}
+
+
+/* Release the extra buffer */
+static void normalize_buffer(OSST_buffer *STbuffer)
+{
+ int i, order, b_size;
+
+ for (i=STbuffer->orig_sg_segs; i < STbuffer->sg_segs; i++) {
+
+ for (b_size = PAGE_SIZE, order = 0;
+ b_size < STbuffer->sg[i].length;
+ b_size *= 2, order++);
+
+ free_pages((unsigned long)STbuffer->sg[i].address, order);
+ STbuffer->buffer_size -= STbuffer->sg[i].length;
+ }
+#if DEBUG
+ if (debugging && STbuffer->orig_sg_segs < STbuffer->sg_segs)
+ printk(OSST_DEB_MSG "osst: Buffer at %p normalized to %d bytes (segs %d).\n",
+ STbuffer->b_data, STbuffer->buffer_size, STbuffer->sg_segs);
+#endif
+ STbuffer->sg_segs = STbuffer->orig_sg_segs;
+}
+
+
+/* Move data from the user buffer to the tape buffer. Returns zero (success) or
+ negative error code. */
+static int append_to_buffer(const char *ubp, 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: Append_to_buffer offset overflow.\n");
+ return (-EIO);
+ }
+ for ( ; i < st_bp->sg_segs && do_count > 0; i++) {
+ cnt = st_bp->sg[i].length - offset < do_count ?
+ st_bp->sg[i].length - offset : do_count;
+ res = copy_from_user(st_bp->sg[i].address + offset, ubp, cnt);
+ if (res)
+ return (-EFAULT);
+ do_count -= cnt;
+ st_bp->buffer_bytes += cnt;
+ ubp += cnt;
+ offset = 0;
+ }
+ if (do_count) { /* Should never happen */
+ printk(KERN_WARNING "osst: 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(OSST_buffer *st_bp, char *ubp, int do_count)
+{
+ int i, cnt, res, offset;
+
+ for (i=0, offset=st_bp->read_pointer;
+ i < st_bp->sg_segs && offset >= st_bp->sg[i].length; i++)
+ offset -= st_bp->sg[i].length;
+ if (i == st_bp->sg_segs) { /* Should never happen */
+ printk(KERN_WARNING "osst: From_buffer offset overflow.\n");
+ return (-EIO);
+ }
+ for ( ; i < st_bp->sg_segs && do_count > 0; i++) {
+ cnt = st_bp->sg[i].length - offset < do_count ?
+ st_bp->sg[i].length - offset : do_count;
+ res = copy_to_user(ubp, st_bp->sg[i].address + offset, cnt);
+ if (res)
+ return (-EFAULT);
+ do_count -= cnt;
+ st_bp->buffer_bytes -= cnt;
+ st_bp->read_pointer += cnt;
+ ubp += cnt;
+ offset = 0;
+ }
+ if (do_count) { /* Should never happen */
+ printk(KERN_WARNING "osst: 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(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: Zero_buffer offset overflow.\n");
+ return (-EIO);
+ }
+ for (do_count = OS_DATA_SIZE - st_bp->read_pointer;
+ 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(st_bp->sg[i].address + offset, 0, cnt);
+ do_count -= cnt;
+ offset = 0;
+ }
+ if (do_count) { /* Should never happen */
+ printk(KERN_WARNING "osst: Zero_buffer overflow (left %d).\n", do_count);
+ return (-EIO);
+ }
+ return 0;
+}
+
+/* Copy a osst 32K block of memory into the buffer.
+ Returns zero (success) or negative error code. */
+static int osst_copy_to_buffer(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(st_bp->sg[i].address, ptr, cnt);
+ do_count -= cnt;
+ ptr += cnt;
+ }
+ if (do_count || i != st_bp->sg_segs-1) { /* Should never happen */
+ printk(KERN_WARNING "osst: Copy_to_buffer overflow (left %d at sg %d).\n",
+ do_count, i);
+ return (-EIO);
+ }
+ return 0;
+}
+
+/* Copy a osst 32K block of memory from the buffer.
+ Returns zero (success) or negative error code. */
+static int osst_copy_from_buffer(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, st_bp->sg[i].address, cnt);
+ do_count -= cnt;
+ ptr += cnt;
+ }
+ if (do_count || i != st_bp->sg_segs-1) { /* Should never happen */
+ printk(KERN_WARNING "osst: 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 (buffer_kbs > 0)
+ osst_buffer_size = buffer_kbs * ST_KILOBYTE;
+ 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_buffers > 0)
+ osst_max_buffers = max_buffers;
+ if (max_sg_segs >= OSST_FIRST_SG)
+ osst_max_sg_segs = max_sg_segs;
+ printk(KERN_INFO "osst: bufsize %d, wrt %d, max buffers %d, s/g segs %d.\n",
+ osst_buffer_size, osst_write_threshold, osst_max_buffers, osst_max_sg_segs);
+//printk(OSST_DEB_MSG "osst: sizeof(header) = %d (%s)\n",sizeof(os_header_t),sizeof(os_header_t)==OS_DATA_SIZE?"ok":"error");
+}
+
+#ifndef MODULE
+/* Set the boot options. Syntax: osst=xxx,yyy,...
+ where xxx is buffer size in 1024 byte blocks and yyy is write threshold
+ in 1024 byte blocks. */
+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_WARNING "osst: 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 = {
+ read: osst_read,
+ write: osst_write,
+ ioctl: osst_ioctl,
+ open: os_scsi_tape_open,
+ flush: os_scsi_tape_flush,
+ release: os_scsi_tape_close,
+};
+
+static int osst_supports(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;
+}
+
+static int osst_attach(Scsi_Device * SDp)
+{
+ OS_Scsi_Tape * tpnt;
+ ST_mode * STm;
+ ST_partstat * STps;
+ int i;
+#ifdef CONFIG_DEVFS_FS
+ int mode;
+#endif
+
+ if (SDp->type != TYPE_TAPE || !osst_supports(SDp))
+ return 1;
+
+ if (osst_template.nr_dev >= osst_template.dev_max) {
+ SDp->attached--;
+ return 1;
+ }
+
+ /* find a free minor number */
+ for (i=0; os_scsi_tapes[i] && i<osst_template.dev_max; i++);
+ if(i >= osst_template.dev_max) panic ("Scsi_devices corrupt (osst)");
+
+ /* allocate a OS_Scsi_Tape for this device */
+ tpnt = (OS_Scsi_Tape *)kmalloc(sizeof(OS_Scsi_Tape), GFP_ATOMIC);
+ if (tpnt == NULL) {
+ SDp->attached--;
+ printk(KERN_ERR "osst: Can't allocate device descriptor.\n");
+ return 1;
+ }
+ memset(tpnt, 0, sizeof(OS_Scsi_Tape));
+ os_scsi_tapes[i] = tpnt;
+ tpnt->capacity = 0xfffff;
+
+ /* allocate a buffer for this device */
+ if (!new_tape_buffer(TRUE, TRUE))
+ printk(KERN_ERR "osst: Unable to allocate a tape buffer.\n");
+
+#ifdef CONFIG_DEVFS_FS
+ for (mode = 0; mode < ST_NBR_MODES; ++mode) {
+ char name[8];
+ static char *formats[ST_NBR_MODES] ={"", "l", "m", "a"};
+
+ /* Rewind entry */
+ sprintf (name, "mt%s", formats[mode]);
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
+ tpnt->de_r[mode] =
+ devfs_register (SDp->de, name, DEVFS_FL_DEFAULT,
+ MAJOR_NR, i + (mode << 5),
+ S_IFCHR | S_IRUGO | S_IWUGO,
+ &osst_fops, NULL);
+# else
+ tpnt->de_r[mode] =
+ devfs_register (SDp->de, name, 0, DEVFS_FL_DEFAULT,
+ MAJOR_NR, i + (mode << 5),
+ S_IFCHR | S_IRUGO | S_IWUGO,
+ 0, 0, &osst_fops, NULL);
+# endif
+ /* No-rewind entry */
+ sprintf (name, "mt%sn", formats[mode]);
+# if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,0)
+ tpnt->de_n[mode] =
+ devfs_register (SDp->de, name, DEVFS_FL_DEFAULT,
+ MAJOR_NR, i + (mode << 5) + 128,
+ S_IFCHR | S_IRUGO | S_IWUGO,
+ &osst_fops, NULL);
+# else
+ tpnt->de_n[mode] =
+ devfs_register (SDp->de, name, 0, DEVFS_FL_DEFAULT,
+ MAJOR_NR, i + (mode << 5) + 128,
+ S_IFCHR | S_IRUGO | S_IWUGO,
+ 0, 0, &osst_fops, NULL);
+# endif
+ }
+ devfs_register_tape (tpnt->de_r[0]);
+#endif
+
+ tpnt->device = SDp;
+ tpnt->devt = MKDEV(MAJOR_NR, i);
+ tpnt->dirty = 0;
+ tpnt->in_use = 0;
+ tpnt->drv_buffer = 1; /* Try buffering if no mode sense */
+ tpnt->restr_dma = (SDp->host)->unchecked_isa_dma;
+ tpnt->density = 0;
+ tpnt->do_auto_lock = 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->timeout = OSST_TIMEOUT;
+ tpnt->long_timeout = OSST_LONG_TIMEOUT;
+
+ /* Recognize OnStream tapes */
+ printk ("osst%i: Tape driver with OnStream support osst %s\nosst%i: %s\n",
+ i, osst_version, i, cvsid);
+ /* 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);
+#if DEBUG
+ printk ("osst%i: OnStream tape drive recognized, Model %s\n", i, SDp->model);
+#endif
+ tpnt->omit_blklims = 1;
+
+ tpnt->poll = (strncmp(SDp->model, "DI-", 3) == 0) || OSST_FW_NEED_POLL(tpnt->os_fw_rev,SDp);
+ tpnt->logical_blk_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 = FALSE;
+ 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 = 32 * ST_KILOBYTE; /* No forced size */
+ STm->default_density = (-1); /* No forced density */
+ }
+
+ for (i=0; i < ST_NBR_PARTITIONS; i++) {
+ STps = &(tpnt->ps[i]);
+ STps->rw = ST_IDLE;
+ STps->eof = ST_NOEOF;
+ STps->at_sm = 0;
+ STps->last_block_valid = FALSE;
+ STps->drv_block = (-1);
+ STps->drv_file = (-1);
+ }
+
+ tpnt->current_mode = 0;
+ tpnt->modes[0].defined = TRUE;
+ tpnt->density_changed = tpnt->compression_changed = tpnt->blksize_changed = FALSE;
+ init_MUTEX(&tpnt->lock);
+
+ osst_template.nr_dev++;
+ return 0;
+};
+
+static int osst_detect(Scsi_Device * SDp)
+{
+ if (SDp->type != TYPE_TAPE) return 0;
+ if ( ! osst_supports(SDp) ) return 0;
+
+ printk(KERN_WARNING
+ "Detected OnStream scsi tape osst%d at scsi%d, channel %d, id %d, lun %d\n",
+ osst_template.dev_noticed++,
+ SDp->host->host_no, SDp->channel, SDp->id, SDp->lun);
+ return 1;
+}
+
+static int osst_registered = 0;
+
+/* Driver initialization (not __initfunc because may be called later) */
+static int osst_init()
+{
+ int i;
+
+ if (osst_template.dev_noticed == 0) return 0;
+
+ if(!osst_registered) {
+#ifdef CONFIG_DEVFS_FS
+ if (devfs_register_chrdev(MAJOR_NR,"osst",&osst_fops)) {
+#else
+ if (register_chrdev(MAJOR_NR,"osst",&osst_fops)) {
+#endif
+ printk(KERN_ERR "osst: Unable to get major %d for OnStream tapes\n",MAJOR_NR);
+ return 1;
+ }
+ osst_registered++;
+ }
+
+ if (os_scsi_tapes) return 0;
+ osst_template.dev_max = OSST_MAX_TAPES;
+ if (osst_template.dev_max > 128 / ST_NBR_MODES)
+ printk(KERN_INFO "osst: Only %d tapes accessible.\n", 128 / ST_NBR_MODES);
+ os_scsi_tapes =
+ (OS_Scsi_Tape **)kmalloc(osst_template.dev_max * sizeof(OS_Scsi_Tape *),
+ GFP_ATOMIC);
+ if (os_scsi_tapes == NULL) {
+ printk(KERN_ERR "osst: Unable to allocate array for OnStream SCSI tapes.\n");
+#ifdef CONFIG_DEVFS_FS
+ devfs_unregister_chrdev(MAJOR_NR, "osst");
+#else
+ unregister_chrdev(MAJOR_NR, "osst");
+#endif
+ return 1;
+ }
+
+ for (i=0; i < osst_template.dev_max; ++i) os_scsi_tapes[i] = NULL;
+
+ /* Allocate the buffer pointers */
+ osst_buffers =
+ (OSST_buffer **)kmalloc(osst_template.dev_max * sizeof(OSST_buffer *),
+ GFP_ATOMIC);
+ if (osst_buffers == NULL) {
+ printk(KERN_ERR "osst: Unable to allocate tape buffer pointers.\n");
+#ifdef CONFIG_DEVFS_FS
+ devfs_unregister_chrdev(MAJOR_NR, "osst");
+#else
+ unregister_chrdev(MAJOR_NR, "osst");
+#endif
+ kfree(os_scsi_tapes);
+ return 1;
+ }
+ osst_nbr_buffers = 0;
+
+#if DEBUG
+ printk(OSST_DEB_MSG "osst: Buffer size %d bytes, write threshold %d bytes.\n",
+ osst_buffer_size, osst_write_threshold);
+#endif
+ return 0;
+}
+
+
+static void osst_detach(Scsi_Device * SDp)
+{
+ OS_Scsi_Tape * tpnt;
+ int i;
+#ifdef CONFIG_DEVFS_FS
+ int mode;
+#endif
+
+ for(i=0; i<osst_template.dev_max; i++) {
+ tpnt = os_scsi_tapes[i];
+ if(tpnt != NULL && tpnt->device == SDp) {
+ tpnt->device = NULL;
+#ifdef CONFIG_DEVFS_FS
+ for (mode = 0; mode < ST_NBR_MODES; ++mode) {
+ devfs_unregister (tpnt->de_r[mode]);
+ tpnt->de_r[mode] = NULL;
+ devfs_unregister (tpnt->de_n[mode]);
+ tpnt->de_n[mode] = NULL;
+ }
+#endif
+ kfree(tpnt);
+ os_scsi_tapes[i] = NULL;
+ SDp->attached--;
+ osst_template.nr_dev--;
+ osst_template.dev_noticed--;
+ return;
+ }
+ }
+ return;
+}
+
+static int __init init_osst(void)
+{
+ validate_options();
+ osst_template.module = THIS_MODULE;
+ return scsi_register_module(MODULE_SCSI_DEV, &osst_template);
+}
+
+static void __exit exit_osst (void)
+{
+ int i;
+ OS_Scsi_Tape * STp;
+
+ scsi_unregister_module(MODULE_SCSI_DEV, &osst_template);
+#ifdef CONFIG_DEVFS_FS
+ devfs_unregister_chrdev(MAJOR_NR, "osst");
+#else
+ unregister_chrdev(MAJOR_NR, "osst");
+#endif
+ osst_registered--;
+ if(os_scsi_tapes != NULL) {
+ for (i=0; i < osst_template.dev_max; ++i) {
+ if ((STp = os_scsi_tapes[i])) {
+ if (STp->header_cache != NULL) vfree(STp->header_cache);
+ kfree(STp);
+ }
+ }
+ kfree(os_scsi_tapes);
+
+ if (osst_buffers != NULL) {
+ for (i=0; i < osst_nbr_buffers; i++)
+ if (osst_buffers[i] != NULL) {
+ osst_buffers[i]->orig_sg_segs = 0;
+ normalize_buffer(osst_buffers[i]);
+ kfree(osst_buffers[i]);
+ }
+
+ kfree(osst_buffers);
+ }
+ }
+ osst_template.dev_max = 0;
+ printk(KERN_INFO "osst: Unloaded.\n");
+}
+
+module_init(init_osst);
+module_exit(exit_osst);
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)