1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 SCSI Tape Driver for Linux version 1.1 and newer. See the accompanying 4 file Documentation/scsi/st.rst for more information. 5 6 History: 7 Rewritten from Dwayne Forsyth's SCSI tape driver by Kai Makisara. 8 Contribution and ideas from several people including (in alphabetical 9 order) Klaus Ehrenfried, Eugene Exarevsky, Eric Lee Green, Wolfgang Denk, 10 Steve Hirsch, Andreas Koppenh"ofer, Michael Leodolter, Eyal Lebedinsky, 11 Michael Schaefer, J"org Weule, and Eric Youngdale. 12 13 Copyright 1992 - 2016 Kai Makisara 14 email Kai.Makisara@kolumbus.fi 15 16 Some small formal changes - aeb, 950809 17 18 Last modified: 18-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 19 */ 20 21 static const char *verstr = "20160209"; 22 23 #include <linux/module.h> 24 25 #include <linux/compat.h> 26 #include <linux/fs.h> 27 #include <linux/kernel.h> 28 #include <linux/sched/signal.h> 29 #include <linux/mm.h> 30 #include <linux/init.h> 31 #include <linux/string.h> 32 #include <linux/slab.h> 33 #include <linux/errno.h> 34 #include <linux/mtio.h> 35 #include <linux/cdrom.h> 36 #include <linux/ioctl.h> 37 #include <linux/fcntl.h> 38 #include <linux/spinlock.h> 39 #include <linux/blkdev.h> 40 #include <linux/moduleparam.h> 41 #include <linux/cdev.h> 42 #include <linux/idr.h> 43 #include <linux/delay.h> 44 #include <linux/mutex.h> 45 46 #include <linux/uaccess.h> 47 #include <asm/dma.h> 48 #include <asm/unaligned.h> 49 50 #include <scsi/scsi.h> 51 #include <scsi/scsi_dbg.h> 52 #include <scsi/scsi_device.h> 53 #include <scsi/scsi_driver.h> 54 #include <scsi/scsi_eh.h> 55 #include <scsi/scsi_host.h> 56 #include <scsi/scsi_ioctl.h> 57 #include <scsi/sg.h> 58 59 60 /* The driver prints some debugging information on the console if DEBUG 61 is defined and non-zero. */ 62 #define DEBUG 1 63 #define NO_DEBUG 0 64 65 #define ST_DEB_MSG KERN_NOTICE 66 #if DEBUG 67 /* The message level for the debug messages is currently set to KERN_NOTICE 68 so that people can easily see the messages. Later when the debugging messages 69 in the drivers are more widely classified, this may be changed to KERN_DEBUG. */ 70 #define DEB(a) a 71 #define DEBC(a) if (debugging) { a ; } 72 #else 73 #define DEB(a) 74 #define DEBC(a) 75 #endif 76 77 #define ST_KILOBYTE 1024 78 79 #include "st_options.h" 80 #include "st.h" 81 82 static int buffer_kbs; 83 static int max_sg_segs; 84 static int try_direct_io = TRY_DIRECT_IO; 85 static int try_rdio = 1; 86 static int try_wdio = 1; 87 static int debug_flag; 88 89 static struct class st_sysfs_class; 90 static const struct attribute_group *st_dev_groups[]; 91 static const struct attribute_group *st_drv_groups[]; 92 93 MODULE_AUTHOR("Kai Makisara"); 94 MODULE_DESCRIPTION("SCSI tape (st) driver"); 95 MODULE_LICENSE("GPL"); 96 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_TAPE_MAJOR); 97 MODULE_ALIAS_SCSI_DEVICE(TYPE_TAPE); 98 99 /* Set 'perm' (4th argument) to 0 to disable module_param's definition 100 * of sysfs parameters (which module_param doesn't yet support). 101 * Sysfs parameters defined explicitly later. 102 */ 103 module_param_named(buffer_kbs, buffer_kbs, int, 0); 104 MODULE_PARM_DESC(buffer_kbs, "Default driver buffer size for fixed block mode (KB; 32)"); 105 module_param_named(max_sg_segs, max_sg_segs, int, 0); 106 MODULE_PARM_DESC(max_sg_segs, "Maximum number of scatter/gather segments to use (256)"); 107 module_param_named(try_direct_io, try_direct_io, int, 0); 108 MODULE_PARM_DESC(try_direct_io, "Try direct I/O between user buffer and tape drive (1)"); 109 module_param_named(debug_flag, debug_flag, int, 0); 110 MODULE_PARM_DESC(debug_flag, "Enable DEBUG, same as setting debugging=1"); 111 112 113 /* Extra parameters for testing */ 114 module_param_named(try_rdio, try_rdio, int, 0); 115 MODULE_PARM_DESC(try_rdio, "Try direct read i/o when possible"); 116 module_param_named(try_wdio, try_wdio, int, 0); 117 MODULE_PARM_DESC(try_wdio, "Try direct write i/o when possible"); 118 119 #ifndef MODULE 120 static int write_threshold_kbs; /* retained for compatibility */ 121 static struct st_dev_parm { 122 char *name; 123 int *val; 124 } parms[] __initdata = { 125 { 126 "buffer_kbs", &buffer_kbs 127 }, 128 { /* Retained for compatibility with 2.4 */ 129 "write_threshold_kbs", &write_threshold_kbs 130 }, 131 { 132 "max_sg_segs", NULL 133 }, 134 { 135 "try_direct_io", &try_direct_io 136 }, 137 { 138 "debug_flag", &debug_flag 139 } 140 }; 141 #endif 142 143 /* Restrict the number of modes so that names for all are assigned */ 144 #if ST_NBR_MODES > 16 145 #error "Maximum number of modes is 16" 146 #endif 147 /* Bit reversed order to get same names for same minors with all 148 mode counts */ 149 static const char *st_formats[] = { 150 "", "r", "k", "s", "l", "t", "o", "u", 151 "m", "v", "p", "x", "a", "y", "q", "z"}; 152 153 /* The default definitions have been moved to st_options.h */ 154 155 #define ST_FIXED_BUFFER_SIZE (ST_FIXED_BUFFER_BLOCKS * ST_KILOBYTE) 156 157 /* The buffer size should fit into the 24 bits for length in the 158 6-byte SCSI read and write commands. */ 159 #if ST_FIXED_BUFFER_SIZE >= (2 << 24 - 1) 160 #error "Buffer size should not exceed (2 << 24 - 1) bytes!" 161 #endif 162 163 static int debugging = DEBUG; 164 165 #define MAX_RETRIES 0 166 #define MAX_WRITE_RETRIES 0 167 #define MAX_READY_RETRIES 0 168 #define NO_TAPE NOT_READY 169 170 #define ST_TIMEOUT (900 * HZ) 171 #define ST_LONG_TIMEOUT (14000 * HZ) 172 173 /* Remove mode bits and auto-rewind bit (7) */ 174 #define TAPE_NR(x) ( ((iminor(x) & ~255) >> (ST_NBR_MODE_BITS + 1)) | \ 175 (iminor(x) & ((1 << ST_MODE_SHIFT)-1))) 176 #define TAPE_MODE(x) ((iminor(x) & ST_MODE_MASK) >> ST_MODE_SHIFT) 177 178 /* Construct the minor number from the device (d), mode (m), and non-rewind (n) data */ 179 #define TAPE_MINOR(d, m, n) (((d & ~(255 >> (ST_NBR_MODE_BITS + 1))) << (ST_NBR_MODE_BITS + 1)) | \ 180 (d & (255 >> (ST_NBR_MODE_BITS + 1))) | (m << ST_MODE_SHIFT) | ((n != 0) << 7) ) 181 182 /* Internal ioctl to set both density (uppermost 8 bits) and blocksize (lower 183 24 bits) */ 184 #define SET_DENS_AND_BLK 0x10001 185 186 static int st_fixed_buffer_size = ST_FIXED_BUFFER_SIZE; 187 static int st_max_sg_segs = ST_MAX_SG; 188 189 static int modes_defined; 190 191 static int enlarge_buffer(struct st_buffer *, int, int); 192 static void clear_buffer(struct st_buffer *); 193 static void normalize_buffer(struct st_buffer *); 194 static int append_to_buffer(const char __user *, struct st_buffer *, int); 195 static int from_buffer(struct st_buffer *, char __user *, int); 196 static void move_buffer_data(struct st_buffer *, int); 197 198 static int sgl_map_user_pages(struct st_buffer *, const unsigned int, 199 unsigned long, size_t, int); 200 static int sgl_unmap_user_pages(struct st_buffer *, const unsigned int, int); 201 202 static int st_probe(struct device *); 203 static int st_remove(struct device *); 204 205 static struct scsi_driver st_template = { 206 .gendrv = { 207 .name = "st", 208 .owner = THIS_MODULE, 209 .probe = st_probe, 210 .remove = st_remove, 211 .groups = st_drv_groups, 212 }, 213 }; 214 215 static int st_compression(struct scsi_tape *, int); 216 217 static int find_partition(struct scsi_tape *); 218 static int switch_partition(struct scsi_tape *); 219 220 static int st_int_ioctl(struct scsi_tape *, unsigned int, unsigned long); 221 222 static void scsi_tape_release(struct kref *); 223 224 #define to_scsi_tape(obj) container_of(obj, struct scsi_tape, kref) 225 226 static DEFINE_MUTEX(st_ref_mutex); 227 static DEFINE_SPINLOCK(st_index_lock); 228 static DEFINE_SPINLOCK(st_use_lock); 229 static DEFINE_IDR(st_index_idr); 230 231 232 233 #ifndef SIGS_FROM_OSST 234 #define SIGS_FROM_OSST \ 235 {"OnStream", "SC-", "", "osst"}, \ 236 {"OnStream", "DI-", "", "osst"}, \ 237 {"OnStream", "DP-", "", "osst"}, \ 238 {"OnStream", "USB", "", "osst"}, \ 239 {"OnStream", "FW-", "", "osst"} 240 #endif 241 242 static struct scsi_tape *scsi_tape_get(int dev) 243 { 244 struct scsi_tape *STp = NULL; 245 246 mutex_lock(&st_ref_mutex); 247 spin_lock(&st_index_lock); 248 249 STp = idr_find(&st_index_idr, dev); 250 if (!STp) goto out; 251 252 kref_get(&STp->kref); 253 254 if (!STp->device) 255 goto out_put; 256 257 if (scsi_device_get(STp->device)) 258 goto out_put; 259 260 goto out; 261 262 out_put: 263 kref_put(&STp->kref, scsi_tape_release); 264 STp = NULL; 265 out: 266 spin_unlock(&st_index_lock); 267 mutex_unlock(&st_ref_mutex); 268 return STp; 269 } 270 271 static void scsi_tape_put(struct scsi_tape *STp) 272 { 273 struct scsi_device *sdev = STp->device; 274 275 mutex_lock(&st_ref_mutex); 276 kref_put(&STp->kref, scsi_tape_release); 277 scsi_device_put(sdev); 278 mutex_unlock(&st_ref_mutex); 279 } 280 281 struct st_reject_data { 282 char *vendor; 283 char *model; 284 char *rev; 285 char *driver_hint; /* Name of the correct driver, NULL if unknown */ 286 }; 287 288 static struct st_reject_data reject_list[] = { 289 /* {"XXX", "Yy-", "", NULL}, example */ 290 SIGS_FROM_OSST, 291 {NULL, }}; 292 293 /* If the device signature is on the list of incompatible drives, the 294 function returns a pointer to the name of the correct driver (if known) */ 295 static char * st_incompatible(struct scsi_device* SDp) 296 { 297 struct st_reject_data *rp; 298 299 for (rp=&(reject_list[0]); rp->vendor != NULL; rp++) 300 if (!strncmp(rp->vendor, SDp->vendor, strlen(rp->vendor)) && 301 !strncmp(rp->model, SDp->model, strlen(rp->model)) && 302 !strncmp(rp->rev, SDp->rev, strlen(rp->rev))) { 303 if (rp->driver_hint) 304 return rp->driver_hint; 305 else 306 return "unknown"; 307 } 308 return NULL; 309 } 310 311 312 static inline char *tape_name(struct scsi_tape *tape) 313 { 314 return tape->disk->disk_name; 315 } 316 317 #define st_printk(prefix, t, fmt, a...) \ 318 sdev_prefix_printk(prefix, (t)->device, tape_name(t), fmt, ##a) 319 #ifdef DEBUG 320 #define DEBC_printk(t, fmt, a...) \ 321 if (debugging) { st_printk(ST_DEB_MSG, t, fmt, ##a ); } 322 #else 323 #define DEBC_printk(t, fmt, a...) 324 #endif 325 326 static void st_analyze_sense(struct st_request *SRpnt, struct st_cmdstatus *s) 327 { 328 const u8 *ucp; 329 const u8 *sense = SRpnt->sense; 330 331 s->have_sense = scsi_normalize_sense(SRpnt->sense, 332 SCSI_SENSE_BUFFERSIZE, &s->sense_hdr); 333 s->flags = 0; 334 335 if (s->have_sense) { 336 s->deferred = 0; 337 s->remainder_valid = 338 scsi_get_sense_info_fld(sense, SCSI_SENSE_BUFFERSIZE, &s->uremainder64); 339 switch (sense[0] & 0x7f) { 340 case 0x71: 341 s->deferred = 1; 342 /* fall through */ 343 case 0x70: 344 s->fixed_format = 1; 345 s->flags = sense[2] & 0xe0; 346 break; 347 case 0x73: 348 s->deferred = 1; 349 /* fall through */ 350 case 0x72: 351 s->fixed_format = 0; 352 ucp = scsi_sense_desc_find(sense, SCSI_SENSE_BUFFERSIZE, 4); 353 s->flags = ucp ? (ucp[3] & 0xe0) : 0; 354 break; 355 } 356 } 357 } 358 359 360 /* Convert the result to success code */ 361 static int st_chk_result(struct scsi_tape *STp, struct st_request * SRpnt) 362 { 363 int result = SRpnt->result; 364 u8 scode; 365 DEB(const char *stp;) 366 char *name = tape_name(STp); 367 struct st_cmdstatus *cmdstatp; 368 369 if (!result) 370 return 0; 371 372 cmdstatp = &STp->buffer->cmdstat; 373 st_analyze_sense(SRpnt, cmdstatp); 374 375 if (cmdstatp->have_sense) 376 scode = STp->buffer->cmdstat.sense_hdr.sense_key; 377 else 378 scode = 0; 379 380 DEB( 381 if (debugging) { 382 st_printk(ST_DEB_MSG, STp, 383 "Error: %x, cmd: %x %x %x %x %x %x\n", result, 384 SRpnt->cmd[0], SRpnt->cmd[1], SRpnt->cmd[2], 385 SRpnt->cmd[3], SRpnt->cmd[4], SRpnt->cmd[5]); 386 if (cmdstatp->have_sense) 387 __scsi_print_sense(STp->device, name, 388 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 389 } ) /* end DEB */ 390 if (!debugging) { /* Abnormal conditions for tape */ 391 if (!cmdstatp->have_sense) 392 st_printk(KERN_WARNING, STp, 393 "Error %x (driver bt 0x%x, host bt 0x%x).\n", 394 result, driver_byte(result), host_byte(result)); 395 else if (cmdstatp->have_sense && 396 scode != NO_SENSE && 397 scode != RECOVERED_ERROR && 398 /* scode != UNIT_ATTENTION && */ 399 scode != BLANK_CHECK && 400 scode != VOLUME_OVERFLOW && 401 SRpnt->cmd[0] != MODE_SENSE && 402 SRpnt->cmd[0] != TEST_UNIT_READY) { 403 404 __scsi_print_sense(STp->device, name, 405 SRpnt->sense, SCSI_SENSE_BUFFERSIZE); 406 } 407 } 408 409 if (cmdstatp->fixed_format && 410 STp->cln_mode >= EXTENDED_SENSE_START) { /* Only fixed format sense */ 411 if (STp->cln_sense_value) 412 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 413 STp->cln_sense_mask) == STp->cln_sense_value); 414 else 415 STp->cleaning_req |= ((SRpnt->sense[STp->cln_mode] & 416 STp->cln_sense_mask) != 0); 417 } 418 if (cmdstatp->have_sense && 419 cmdstatp->sense_hdr.asc == 0 && cmdstatp->sense_hdr.ascq == 0x17) 420 STp->cleaning_req = 1; /* ASC and ASCQ => cleaning requested */ 421 422 STp->pos_unknown |= STp->device->was_reset; 423 424 if (cmdstatp->have_sense && 425 scode == RECOVERED_ERROR 426 #if ST_RECOVERED_WRITE_FATAL 427 && SRpnt->cmd[0] != WRITE_6 428 && SRpnt->cmd[0] != WRITE_FILEMARKS 429 #endif 430 ) { 431 STp->recover_count++; 432 STp->recover_reg++; 433 434 DEB( 435 if (debugging) { 436 if (SRpnt->cmd[0] == READ_6) 437 stp = "read"; 438 else if (SRpnt->cmd[0] == WRITE_6) 439 stp = "write"; 440 else 441 stp = "ioctl"; 442 st_printk(ST_DEB_MSG, STp, 443 "Recovered %s error (%d).\n", 444 stp, STp->recover_count); 445 } ) /* end DEB */ 446 447 if (cmdstatp->flags == 0) 448 return 0; 449 } 450 return (-EIO); 451 } 452 453 static struct st_request *st_allocate_request(struct scsi_tape *stp) 454 { 455 struct st_request *streq; 456 457 streq = kzalloc(sizeof(*streq), GFP_KERNEL); 458 if (streq) 459 streq->stp = stp; 460 else { 461 st_printk(KERN_ERR, stp, 462 "Can't get SCSI request.\n"); 463 if (signal_pending(current)) 464 stp->buffer->syscall_result = -EINTR; 465 else 466 stp->buffer->syscall_result = -EBUSY; 467 } 468 469 return streq; 470 } 471 472 static void st_release_request(struct st_request *streq) 473 { 474 kfree(streq); 475 } 476 477 static void st_do_stats(struct scsi_tape *STp, struct request *req) 478 { 479 ktime_t now; 480 481 now = ktime_get(); 482 if (scsi_req(req)->cmd[0] == WRITE_6) { 483 now = ktime_sub(now, STp->stats->write_time); 484 atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); 485 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 486 atomic64_inc(&STp->stats->write_cnt); 487 if (scsi_req(req)->result) { 488 atomic64_add(atomic_read(&STp->stats->last_write_size) 489 - STp->buffer->cmdstat.residual, 490 &STp->stats->write_byte_cnt); 491 if (STp->buffer->cmdstat.residual > 0) 492 atomic64_inc(&STp->stats->resid_cnt); 493 } else 494 atomic64_add(atomic_read(&STp->stats->last_write_size), 495 &STp->stats->write_byte_cnt); 496 } else if (scsi_req(req)->cmd[0] == READ_6) { 497 now = ktime_sub(now, STp->stats->read_time); 498 atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); 499 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 500 atomic64_inc(&STp->stats->read_cnt); 501 if (scsi_req(req)->result) { 502 atomic64_add(atomic_read(&STp->stats->last_read_size) 503 - STp->buffer->cmdstat.residual, 504 &STp->stats->read_byte_cnt); 505 if (STp->buffer->cmdstat.residual > 0) 506 atomic64_inc(&STp->stats->resid_cnt); 507 } else 508 atomic64_add(atomic_read(&STp->stats->last_read_size), 509 &STp->stats->read_byte_cnt); 510 } else { 511 now = ktime_sub(now, STp->stats->other_time); 512 atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); 513 atomic64_inc(&STp->stats->other_cnt); 514 } 515 atomic64_dec(&STp->stats->in_flight); 516 } 517 518 static void st_scsi_execute_end(struct request *req, blk_status_t status) 519 { 520 struct st_request *SRpnt = req->end_io_data; 521 struct scsi_request *rq = scsi_req(req); 522 struct scsi_tape *STp = SRpnt->stp; 523 struct bio *tmp; 524 525 STp->buffer->cmdstat.midlevel_result = SRpnt->result = rq->result; 526 STp->buffer->cmdstat.residual = rq->resid_len; 527 528 st_do_stats(STp, req); 529 530 tmp = SRpnt->bio; 531 if (rq->sense_len) 532 memcpy(SRpnt->sense, rq->sense, SCSI_SENSE_BUFFERSIZE); 533 if (SRpnt->waiting) 534 complete(SRpnt->waiting); 535 536 blk_rq_unmap_user(tmp); 537 blk_put_request(req); 538 } 539 540 static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, 541 int data_direction, void *buffer, unsigned bufflen, 542 int timeout, int retries) 543 { 544 struct request *req; 545 struct scsi_request *rq; 546 struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; 547 int err = 0; 548 struct scsi_tape *STp = SRpnt->stp; 549 550 req = blk_get_request(SRpnt->stp->device->request_queue, 551 data_direction == DMA_TO_DEVICE ? 552 REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, 0); 553 if (IS_ERR(req)) 554 return DRIVER_ERROR << 24; 555 rq = scsi_req(req); 556 req->rq_flags |= RQF_QUIET; 557 558 mdata->null_mapped = 1; 559 560 if (bufflen) { 561 err = blk_rq_map_user(req->q, req, mdata, NULL, bufflen, 562 GFP_KERNEL); 563 if (err) { 564 blk_put_request(req); 565 return DRIVER_ERROR << 24; 566 } 567 } 568 569 atomic64_inc(&STp->stats->in_flight); 570 if (cmd[0] == WRITE_6) { 571 atomic_set(&STp->stats->last_write_size, bufflen); 572 STp->stats->write_time = ktime_get(); 573 } else if (cmd[0] == READ_6) { 574 atomic_set(&STp->stats->last_read_size, bufflen); 575 STp->stats->read_time = ktime_get(); 576 } else { 577 STp->stats->other_time = ktime_get(); 578 } 579 580 SRpnt->bio = req->bio; 581 rq->cmd_len = COMMAND_SIZE(cmd[0]); 582 memset(rq->cmd, 0, BLK_MAX_CDB); 583 memcpy(rq->cmd, cmd, rq->cmd_len); 584 req->timeout = timeout; 585 rq->retries = retries; 586 req->end_io_data = SRpnt; 587 588 blk_execute_rq_nowait(req->q, NULL, req, 1, st_scsi_execute_end); 589 return 0; 590 } 591 592 /* Do the scsi command. Waits until command performed if do_wait is true. 593 Otherwise write_behind_check() is used to check that the command 594 has finished. */ 595 static struct st_request * 596 st_do_scsi(struct st_request * SRpnt, struct scsi_tape * STp, unsigned char *cmd, 597 int bytes, int direction, int timeout, int retries, int do_wait) 598 { 599 struct completion *waiting; 600 struct rq_map_data *mdata = &STp->buffer->map_data; 601 int ret; 602 603 /* if async, make sure there's no command outstanding */ 604 if (!do_wait && ((STp->buffer)->last_SRpnt)) { 605 st_printk(KERN_ERR, STp, 606 "Async command already active.\n"); 607 if (signal_pending(current)) 608 (STp->buffer)->syscall_result = (-EINTR); 609 else 610 (STp->buffer)->syscall_result = (-EBUSY); 611 return NULL; 612 } 613 614 if (!SRpnt) { 615 SRpnt = st_allocate_request(STp); 616 if (!SRpnt) 617 return NULL; 618 } 619 620 /* If async IO, set last_SRpnt. This ptr tells write_behind_check 621 which IO is outstanding. It's nulled out when the IO completes. */ 622 if (!do_wait) 623 (STp->buffer)->last_SRpnt = SRpnt; 624 625 waiting = &STp->wait; 626 init_completion(waiting); 627 SRpnt->waiting = waiting; 628 629 if (STp->buffer->do_dio) { 630 mdata->page_order = 0; 631 mdata->nr_entries = STp->buffer->sg_segs; 632 mdata->pages = STp->buffer->mapped_pages; 633 } else { 634 mdata->page_order = STp->buffer->reserved_page_order; 635 mdata->nr_entries = 636 DIV_ROUND_UP(bytes, PAGE_SIZE << mdata->page_order); 637 mdata->pages = STp->buffer->reserved_pages; 638 mdata->offset = 0; 639 } 640 641 memcpy(SRpnt->cmd, cmd, sizeof(SRpnt->cmd)); 642 STp->buffer->cmdstat.have_sense = 0; 643 STp->buffer->syscall_result = 0; 644 645 ret = st_scsi_execute(SRpnt, cmd, direction, NULL, bytes, timeout, 646 retries); 647 if (ret) { 648 /* could not allocate the buffer or request was too large */ 649 (STp->buffer)->syscall_result = (-EBUSY); 650 (STp->buffer)->last_SRpnt = NULL; 651 } else if (do_wait) { 652 wait_for_completion(waiting); 653 SRpnt->waiting = NULL; 654 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 655 } 656 657 return SRpnt; 658 } 659 660 661 /* Handle the write-behind checking (waits for completion). Returns -ENOSPC if 662 write has been correct but EOM early warning reached, -EIO if write ended in 663 error or zero if write successful. Asynchronous writes are used only in 664 variable block mode. */ 665 static int write_behind_check(struct scsi_tape * STp) 666 { 667 int retval = 0; 668 struct st_buffer *STbuffer; 669 struct st_partstat *STps; 670 struct st_cmdstatus *cmdstatp; 671 struct st_request *SRpnt; 672 673 STbuffer = STp->buffer; 674 if (!STbuffer->writing) 675 return 0; 676 677 DEB( 678 if (STp->write_pending) 679 STp->nbr_waits++; 680 else 681 STp->nbr_finished++; 682 ) /* end DEB */ 683 684 wait_for_completion(&(STp->wait)); 685 SRpnt = STbuffer->last_SRpnt; 686 STbuffer->last_SRpnt = NULL; 687 SRpnt->waiting = NULL; 688 689 (STp->buffer)->syscall_result = st_chk_result(STp, SRpnt); 690 st_release_request(SRpnt); 691 692 STbuffer->buffer_bytes -= STbuffer->writing; 693 STps = &(STp->ps[STp->partition]); 694 if (STps->drv_block >= 0) { 695 if (STp->block_size == 0) 696 STps->drv_block++; 697 else 698 STps->drv_block += STbuffer->writing / STp->block_size; 699 } 700 701 cmdstatp = &STbuffer->cmdstat; 702 if (STbuffer->syscall_result) { 703 retval = -EIO; 704 if (cmdstatp->have_sense && !cmdstatp->deferred && 705 (cmdstatp->flags & SENSE_EOM) && 706 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 707 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR)) { 708 /* EOM at write-behind, has all data been written? */ 709 if (!cmdstatp->remainder_valid || 710 cmdstatp->uremainder64 == 0) 711 retval = -ENOSPC; 712 } 713 if (retval == -EIO) 714 STps->drv_block = -1; 715 } 716 STbuffer->writing = 0; 717 718 DEB(if (debugging && retval) 719 st_printk(ST_DEB_MSG, STp, 720 "Async write error %x, return value %d.\n", 721 STbuffer->cmdstat.midlevel_result, retval);) /* end DEB */ 722 723 return retval; 724 } 725 726 727 /* Step over EOF if it has been inadvertently crossed (ioctl not used because 728 it messes up the block number). */ 729 static int cross_eof(struct scsi_tape * STp, int forward) 730 { 731 struct st_request *SRpnt; 732 unsigned char cmd[MAX_COMMAND_SIZE]; 733 734 cmd[0] = SPACE; 735 cmd[1] = 0x01; /* Space FileMarks */ 736 if (forward) { 737 cmd[2] = cmd[3] = 0; 738 cmd[4] = 1; 739 } else 740 cmd[2] = cmd[3] = cmd[4] = 0xff; /* -1 filemarks */ 741 cmd[5] = 0; 742 743 DEBC_printk(STp, "Stepping over filemark %s.\n", 744 forward ? "forward" : "backward"); 745 746 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 747 STp->device->request_queue->rq_timeout, 748 MAX_RETRIES, 1); 749 if (!SRpnt) 750 return (STp->buffer)->syscall_result; 751 752 st_release_request(SRpnt); 753 SRpnt = NULL; 754 755 if ((STp->buffer)->cmdstat.midlevel_result != 0) 756 st_printk(KERN_ERR, STp, 757 "Stepping over filemark %s failed.\n", 758 forward ? "forward" : "backward"); 759 760 return (STp->buffer)->syscall_result; 761 } 762 763 764 /* Flush the write buffer (never need to write if variable blocksize). */ 765 static int st_flush_write_buffer(struct scsi_tape * STp) 766 { 767 int transfer, blks; 768 int result; 769 unsigned char cmd[MAX_COMMAND_SIZE]; 770 struct st_request *SRpnt; 771 struct st_partstat *STps; 772 773 result = write_behind_check(STp); 774 if (result) 775 return result; 776 777 result = 0; 778 if (STp->dirty == 1) { 779 780 transfer = STp->buffer->buffer_bytes; 781 DEBC_printk(STp, "Flushing %d bytes.\n", transfer); 782 783 memset(cmd, 0, MAX_COMMAND_SIZE); 784 cmd[0] = WRITE_6; 785 cmd[1] = 1; 786 blks = transfer / STp->block_size; 787 cmd[2] = blks >> 16; 788 cmd[3] = blks >> 8; 789 cmd[4] = blks; 790 791 SRpnt = st_do_scsi(NULL, STp, cmd, transfer, DMA_TO_DEVICE, 792 STp->device->request_queue->rq_timeout, 793 MAX_WRITE_RETRIES, 1); 794 if (!SRpnt) 795 return (STp->buffer)->syscall_result; 796 797 STps = &(STp->ps[STp->partition]); 798 if ((STp->buffer)->syscall_result != 0) { 799 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 800 801 if (cmdstatp->have_sense && !cmdstatp->deferred && 802 (cmdstatp->flags & SENSE_EOM) && 803 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 804 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 805 (!cmdstatp->remainder_valid || 806 cmdstatp->uremainder64 == 0)) { /* All written at EOM early warning */ 807 STp->dirty = 0; 808 (STp->buffer)->buffer_bytes = 0; 809 if (STps->drv_block >= 0) 810 STps->drv_block += blks; 811 result = (-ENOSPC); 812 } else { 813 st_printk(KERN_ERR, STp, "Error on flush.\n"); 814 STps->drv_block = (-1); 815 result = (-EIO); 816 } 817 } else { 818 if (STps->drv_block >= 0) 819 STps->drv_block += blks; 820 STp->dirty = 0; 821 (STp->buffer)->buffer_bytes = 0; 822 } 823 st_release_request(SRpnt); 824 SRpnt = NULL; 825 } 826 return result; 827 } 828 829 830 /* Flush the tape buffer. The tape will be positioned correctly unless 831 seek_next is true. */ 832 static int flush_buffer(struct scsi_tape *STp, int seek_next) 833 { 834 int backspace, result; 835 struct st_partstat *STps; 836 837 /* 838 * If there was a bus reset, block further access 839 * to this device. 840 */ 841 if (STp->pos_unknown) 842 return (-EIO); 843 844 if (STp->ready != ST_READY) 845 return 0; 846 STps = &(STp->ps[STp->partition]); 847 if (STps->rw == ST_WRITING) /* Writing */ 848 return st_flush_write_buffer(STp); 849 850 if (STp->block_size == 0) 851 return 0; 852 853 backspace = ((STp->buffer)->buffer_bytes + 854 (STp->buffer)->read_pointer) / STp->block_size - 855 ((STp->buffer)->read_pointer + STp->block_size - 1) / 856 STp->block_size; 857 (STp->buffer)->buffer_bytes = 0; 858 (STp->buffer)->read_pointer = 0; 859 result = 0; 860 if (!seek_next) { 861 if (STps->eof == ST_FM_HIT) { 862 result = cross_eof(STp, 0); /* Back over the EOF hit */ 863 if (!result) 864 STps->eof = ST_NOEOF; 865 else { 866 if (STps->drv_file >= 0) 867 STps->drv_file++; 868 STps->drv_block = 0; 869 } 870 } 871 if (!result && backspace > 0) 872 result = st_int_ioctl(STp, MTBSR, backspace); 873 } else if (STps->eof == ST_FM_HIT) { 874 if (STps->drv_file >= 0) 875 STps->drv_file++; 876 STps->drv_block = 0; 877 STps->eof = ST_NOEOF; 878 } 879 return result; 880 881 } 882 883 /* Set the mode parameters */ 884 static int set_mode_densblk(struct scsi_tape * STp, struct st_modedef * STm) 885 { 886 int set_it = 0; 887 unsigned long arg; 888 889 if (!STp->density_changed && 890 STm->default_density >= 0 && 891 STm->default_density != STp->density) { 892 arg = STm->default_density; 893 set_it = 1; 894 } else 895 arg = STp->density; 896 arg <<= MT_ST_DENSITY_SHIFT; 897 if (!STp->blksize_changed && 898 STm->default_blksize >= 0 && 899 STm->default_blksize != STp->block_size) { 900 arg |= STm->default_blksize; 901 set_it = 1; 902 } else 903 arg |= STp->block_size; 904 if (set_it && 905 st_int_ioctl(STp, SET_DENS_AND_BLK, arg)) { 906 st_printk(KERN_WARNING, STp, 907 "Can't set default block size to %d bytes " 908 "and density %x.\n", 909 STm->default_blksize, STm->default_density); 910 if (modes_defined) 911 return (-EINVAL); 912 } 913 return 0; 914 } 915 916 917 /* Lock or unlock the drive door. Don't use when st_request allocated. */ 918 static int do_door_lock(struct scsi_tape * STp, int do_lock) 919 { 920 int retval; 921 922 DEBC_printk(STp, "%socking drive door.\n", do_lock ? "L" : "Unl"); 923 924 retval = scsi_set_medium_removal(STp->device, 925 do_lock ? SCSI_REMOVAL_PREVENT : SCSI_REMOVAL_ALLOW); 926 if (!retval) 927 STp->door_locked = do_lock ? ST_LOCKED_EXPLICIT : ST_UNLOCKED; 928 else 929 STp->door_locked = ST_LOCK_FAILS; 930 return retval; 931 } 932 933 934 /* Set the internal state after reset */ 935 static void reset_state(struct scsi_tape *STp) 936 { 937 int i; 938 struct st_partstat *STps; 939 940 STp->pos_unknown = 0; 941 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 942 STps = &(STp->ps[i]); 943 STps->rw = ST_IDLE; 944 STps->eof = ST_NOEOF; 945 STps->at_sm = 0; 946 STps->last_block_valid = 0; 947 STps->drv_block = -1; 948 STps->drv_file = -1; 949 } 950 if (STp->can_partitions) { 951 STp->partition = find_partition(STp); 952 if (STp->partition < 0) 953 STp->partition = 0; 954 STp->new_partition = STp->partition; 955 } 956 } 957 958 /* Test if the drive is ready. Returns either one of the codes below or a negative system 959 error code. */ 960 #define CHKRES_READY 0 961 #define CHKRES_NEW_SESSION 1 962 #define CHKRES_NOT_READY 2 963 #define CHKRES_NO_TAPE 3 964 965 #define MAX_ATTENTIONS 10 966 967 static int test_ready(struct scsi_tape *STp, int do_wait) 968 { 969 int attentions, waits, max_wait, scode; 970 int retval = CHKRES_READY, new_session = 0; 971 unsigned char cmd[MAX_COMMAND_SIZE]; 972 struct st_request *SRpnt = NULL; 973 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 974 975 max_wait = do_wait ? ST_BLOCK_SECONDS : 0; 976 977 for (attentions=waits=0; ; ) { 978 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 979 cmd[0] = TEST_UNIT_READY; 980 SRpnt = st_do_scsi(SRpnt, STp, cmd, 0, DMA_NONE, 981 STp->long_timeout, MAX_READY_RETRIES, 1); 982 983 if (!SRpnt) { 984 retval = (STp->buffer)->syscall_result; 985 break; 986 } 987 988 if (cmdstatp->have_sense) { 989 990 scode = cmdstatp->sense_hdr.sense_key; 991 992 if (scode == UNIT_ATTENTION) { /* New media? */ 993 new_session = 1; 994 if (attentions < MAX_ATTENTIONS) { 995 attentions++; 996 continue; 997 } 998 else { 999 retval = (-EIO); 1000 break; 1001 } 1002 } 1003 1004 if (scode == NOT_READY) { 1005 if (waits < max_wait) { 1006 if (msleep_interruptible(1000)) { 1007 retval = (-EINTR); 1008 break; 1009 } 1010 waits++; 1011 continue; 1012 } 1013 else { 1014 if ((STp->device)->scsi_level >= SCSI_2 && 1015 cmdstatp->sense_hdr.asc == 0x3a) /* Check ASC */ 1016 retval = CHKRES_NO_TAPE; 1017 else 1018 retval = CHKRES_NOT_READY; 1019 break; 1020 } 1021 } 1022 } 1023 1024 retval = (STp->buffer)->syscall_result; 1025 if (!retval) 1026 retval = new_session ? CHKRES_NEW_SESSION : CHKRES_READY; 1027 break; 1028 } 1029 1030 if (SRpnt != NULL) 1031 st_release_request(SRpnt); 1032 return retval; 1033 } 1034 1035 1036 /* See if the drive is ready and gather information about the tape. Return values: 1037 < 0 negative error code from errno.h 1038 0 drive ready 1039 1 drive not ready (possibly no tape) 1040 */ 1041 static int check_tape(struct scsi_tape *STp, struct file *filp) 1042 { 1043 int i, retval, new_session = 0, do_wait; 1044 unsigned char cmd[MAX_COMMAND_SIZE], saved_cleaning; 1045 unsigned short st_flags = filp->f_flags; 1046 struct st_request *SRpnt = NULL; 1047 struct st_modedef *STm; 1048 struct st_partstat *STps; 1049 struct inode *inode = file_inode(filp); 1050 int mode = TAPE_MODE(inode); 1051 1052 STp->ready = ST_READY; 1053 1054 if (mode != STp->current_mode) { 1055 DEBC_printk(STp, "Mode change from %d to %d.\n", 1056 STp->current_mode, mode); 1057 new_session = 1; 1058 STp->current_mode = mode; 1059 } 1060 STm = &(STp->modes[STp->current_mode]); 1061 1062 saved_cleaning = STp->cleaning_req; 1063 STp->cleaning_req = 0; 1064 1065 do_wait = ((filp->f_flags & O_NONBLOCK) == 0); 1066 retval = test_ready(STp, do_wait); 1067 1068 if (retval < 0) 1069 goto err_out; 1070 1071 if (retval == CHKRES_NEW_SESSION) { 1072 STp->pos_unknown = 0; 1073 STp->partition = STp->new_partition = 0; 1074 if (STp->can_partitions) 1075 STp->nbr_partitions = 1; /* This guess will be updated later 1076 if necessary */ 1077 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1078 STps = &(STp->ps[i]); 1079 STps->rw = ST_IDLE; 1080 STps->eof = ST_NOEOF; 1081 STps->at_sm = 0; 1082 STps->last_block_valid = 0; 1083 STps->drv_block = 0; 1084 STps->drv_file = 0; 1085 } 1086 new_session = 1; 1087 } 1088 else { 1089 STp->cleaning_req |= saved_cleaning; 1090 1091 if (retval == CHKRES_NOT_READY || retval == CHKRES_NO_TAPE) { 1092 if (retval == CHKRES_NO_TAPE) 1093 STp->ready = ST_NO_TAPE; 1094 else 1095 STp->ready = ST_NOT_READY; 1096 1097 STp->density = 0; /* Clear the erroneous "residue" */ 1098 STp->write_prot = 0; 1099 STp->block_size = 0; 1100 STp->ps[0].drv_file = STp->ps[0].drv_block = (-1); 1101 STp->partition = STp->new_partition = 0; 1102 STp->door_locked = ST_UNLOCKED; 1103 return CHKRES_NOT_READY; 1104 } 1105 } 1106 1107 if (STp->omit_blklims) 1108 STp->min_block = STp->max_block = (-1); 1109 else { 1110 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1111 cmd[0] = READ_BLOCK_LIMITS; 1112 1113 SRpnt = st_do_scsi(SRpnt, STp, cmd, 6, DMA_FROM_DEVICE, 1114 STp->device->request_queue->rq_timeout, 1115 MAX_READY_RETRIES, 1); 1116 if (!SRpnt) { 1117 retval = (STp->buffer)->syscall_result; 1118 goto err_out; 1119 } 1120 1121 if (!SRpnt->result && !STp->buffer->cmdstat.have_sense) { 1122 STp->max_block = ((STp->buffer)->b_data[1] << 16) | 1123 ((STp->buffer)->b_data[2] << 8) | (STp->buffer)->b_data[3]; 1124 STp->min_block = ((STp->buffer)->b_data[4] << 8) | 1125 (STp->buffer)->b_data[5]; 1126 if ( DEB( debugging || ) !STp->inited) 1127 st_printk(KERN_INFO, STp, 1128 "Block limits %d - %d bytes.\n", 1129 STp->min_block, STp->max_block); 1130 } else { 1131 STp->min_block = STp->max_block = (-1); 1132 DEBC_printk(STp, "Can't read block limits.\n"); 1133 } 1134 } 1135 1136 memset((void *) &cmd[0], 0, MAX_COMMAND_SIZE); 1137 cmd[0] = MODE_SENSE; 1138 cmd[4] = 12; 1139 1140 SRpnt = st_do_scsi(SRpnt, STp, cmd, 12, DMA_FROM_DEVICE, 1141 STp->device->request_queue->rq_timeout, 1142 MAX_READY_RETRIES, 1); 1143 if (!SRpnt) { 1144 retval = (STp->buffer)->syscall_result; 1145 goto err_out; 1146 } 1147 1148 if ((STp->buffer)->syscall_result != 0) { 1149 DEBC_printk(STp, "No Mode Sense.\n"); 1150 STp->block_size = ST_DEFAULT_BLOCK; /* Educated guess (?) */ 1151 (STp->buffer)->syscall_result = 0; /* Prevent error propagation */ 1152 STp->drv_write_prot = 0; 1153 } else { 1154 DEBC_printk(STp,"Mode sense. Length %d, " 1155 "medium %x, WBS %x, BLL %d\n", 1156 (STp->buffer)->b_data[0], 1157 (STp->buffer)->b_data[1], 1158 (STp->buffer)->b_data[2], 1159 (STp->buffer)->b_data[3]); 1160 1161 if ((STp->buffer)->b_data[3] >= 8) { 1162 STp->drv_buffer = ((STp->buffer)->b_data[2] >> 4) & 7; 1163 STp->density = (STp->buffer)->b_data[4]; 1164 STp->block_size = (STp->buffer)->b_data[9] * 65536 + 1165 (STp->buffer)->b_data[10] * 256 + (STp->buffer)->b_data[11]; 1166 DEBC_printk(STp, "Density %x, tape length: %x, " 1167 "drv buffer: %d\n", 1168 STp->density, 1169 (STp->buffer)->b_data[5] * 65536 + 1170 (STp->buffer)->b_data[6] * 256 + 1171 (STp->buffer)->b_data[7], 1172 STp->drv_buffer); 1173 } 1174 STp->drv_write_prot = ((STp->buffer)->b_data[2] & 0x80) != 0; 1175 if (!STp->drv_buffer && STp->immediate_filemark) { 1176 st_printk(KERN_WARNING, STp, 1177 "non-buffered tape: disabling " 1178 "writing immediate filemarks\n"); 1179 STp->immediate_filemark = 0; 1180 } 1181 } 1182 st_release_request(SRpnt); 1183 SRpnt = NULL; 1184 STp->inited = 1; 1185 1186 if (STp->block_size > 0) 1187 (STp->buffer)->buffer_blocks = 1188 (STp->buffer)->buffer_size / STp->block_size; 1189 else 1190 (STp->buffer)->buffer_blocks = 1; 1191 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 1192 1193 DEBC_printk(STp, "Block size: %d, buffer size: %d (%d blocks).\n", 1194 STp->block_size, (STp->buffer)->buffer_size, 1195 (STp->buffer)->buffer_blocks); 1196 1197 if (STp->drv_write_prot) { 1198 STp->write_prot = 1; 1199 1200 DEBC_printk(STp, "Write protected\n"); 1201 1202 if (do_wait && 1203 ((st_flags & O_ACCMODE) == O_WRONLY || 1204 (st_flags & O_ACCMODE) == O_RDWR)) { 1205 retval = (-EROFS); 1206 goto err_out; 1207 } 1208 } 1209 1210 if (STp->can_partitions && STp->nbr_partitions < 1) { 1211 /* This code is reached when the device is opened for the first time 1212 after the driver has been initialized with tape in the drive and the 1213 partition support has been enabled. */ 1214 DEBC_printk(STp, "Updating partition number in status.\n"); 1215 if ((STp->partition = find_partition(STp)) < 0) { 1216 retval = STp->partition; 1217 goto err_out; 1218 } 1219 STp->new_partition = STp->partition; 1220 STp->nbr_partitions = 1; /* This guess will be updated when necessary */ 1221 } 1222 1223 if (new_session) { /* Change the drive parameters for the new mode */ 1224 STp->density_changed = STp->blksize_changed = 0; 1225 STp->compression_changed = 0; 1226 if (!(STm->defaults_for_writes) && 1227 (retval = set_mode_densblk(STp, STm)) < 0) 1228 goto err_out; 1229 1230 if (STp->default_drvbuffer != 0xff) { 1231 if (st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer)) 1232 st_printk(KERN_WARNING, STp, 1233 "Can't set default drive " 1234 "buffering to %d.\n", 1235 STp->default_drvbuffer); 1236 } 1237 } 1238 1239 return CHKRES_READY; 1240 1241 err_out: 1242 return retval; 1243 } 1244 1245 1246 /* Open the device. Needs to take the BKL only because of incrementing the SCSI host 1247 module count. */ 1248 static int st_open(struct inode *inode, struct file *filp) 1249 { 1250 int i, retval = (-EIO); 1251 int resumed = 0; 1252 struct scsi_tape *STp; 1253 struct st_partstat *STps; 1254 int dev = TAPE_NR(inode); 1255 1256 /* 1257 * We really want to do nonseekable_open(inode, filp); here, but some 1258 * versions of tar incorrectly call lseek on tapes and bail out if that 1259 * fails. So we disallow pread() and pwrite(), but permit lseeks. 1260 */ 1261 filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); 1262 1263 if (!(STp = scsi_tape_get(dev))) { 1264 return -ENXIO; 1265 } 1266 1267 filp->private_data = STp; 1268 1269 spin_lock(&st_use_lock); 1270 if (STp->in_use) { 1271 spin_unlock(&st_use_lock); 1272 scsi_tape_put(STp); 1273 DEBC_printk(STp, "Device already in use.\n"); 1274 return (-EBUSY); 1275 } 1276 1277 STp->in_use = 1; 1278 spin_unlock(&st_use_lock); 1279 STp->rew_at_close = STp->autorew_dev = (iminor(inode) & 0x80) == 0; 1280 1281 if (scsi_autopm_get_device(STp->device) < 0) { 1282 retval = -EIO; 1283 goto err_out; 1284 } 1285 resumed = 1; 1286 if (!scsi_block_when_processing_errors(STp->device)) { 1287 retval = (-ENXIO); 1288 goto err_out; 1289 } 1290 1291 /* See that we have at least a one page buffer available */ 1292 if (!enlarge_buffer(STp->buffer, PAGE_SIZE, STp->restr_dma)) { 1293 st_printk(KERN_WARNING, STp, 1294 "Can't allocate one page tape buffer.\n"); 1295 retval = (-EOVERFLOW); 1296 goto err_out; 1297 } 1298 1299 (STp->buffer)->cleared = 0; 1300 (STp->buffer)->writing = 0; 1301 (STp->buffer)->syscall_result = 0; 1302 1303 STp->write_prot = ((filp->f_flags & O_ACCMODE) == O_RDONLY); 1304 1305 STp->dirty = 0; 1306 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 1307 STps = &(STp->ps[i]); 1308 STps->rw = ST_IDLE; 1309 } 1310 STp->try_dio_now = STp->try_dio; 1311 STp->recover_count = 0; 1312 DEB( STp->nbr_waits = STp->nbr_finished = 0; 1313 STp->nbr_requests = STp->nbr_dio = STp->nbr_pages = 0; ) 1314 1315 retval = check_tape(STp, filp); 1316 if (retval < 0) 1317 goto err_out; 1318 if ((filp->f_flags & O_NONBLOCK) == 0 && 1319 retval != CHKRES_READY) { 1320 if (STp->ready == NO_TAPE) 1321 retval = (-ENOMEDIUM); 1322 else 1323 retval = (-EIO); 1324 goto err_out; 1325 } 1326 return 0; 1327 1328 err_out: 1329 normalize_buffer(STp->buffer); 1330 spin_lock(&st_use_lock); 1331 STp->in_use = 0; 1332 spin_unlock(&st_use_lock); 1333 if (resumed) 1334 scsi_autopm_put_device(STp->device); 1335 scsi_tape_put(STp); 1336 return retval; 1337 1338 } 1339 1340 1341 /* Flush the tape buffer before close */ 1342 static int st_flush(struct file *filp, fl_owner_t id) 1343 { 1344 int result = 0, result2; 1345 unsigned char cmd[MAX_COMMAND_SIZE]; 1346 struct st_request *SRpnt; 1347 struct scsi_tape *STp = filp->private_data; 1348 struct st_modedef *STm = &(STp->modes[STp->current_mode]); 1349 struct st_partstat *STps = &(STp->ps[STp->partition]); 1350 1351 if (file_count(filp) > 1) 1352 return 0; 1353 1354 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1355 result = st_flush_write_buffer(STp); 1356 if (result != 0 && result != (-ENOSPC)) 1357 goto out; 1358 } 1359 1360 if (STp->can_partitions && 1361 (result2 = switch_partition(STp)) < 0) { 1362 DEBC_printk(STp, "switch_partition at close failed.\n"); 1363 if (result == 0) 1364 result = result2; 1365 goto out; 1366 } 1367 1368 DEBC( if (STp->nbr_requests) 1369 st_printk(KERN_DEBUG, STp, 1370 "Number of r/w requests %d, dio used in %d, " 1371 "pages %d.\n", STp->nbr_requests, STp->nbr_dio, 1372 STp->nbr_pages)); 1373 1374 if (STps->rw == ST_WRITING && !STp->pos_unknown) { 1375 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1376 1377 #if DEBUG 1378 DEBC_printk(STp, "Async write waits %d, finished %d.\n", 1379 STp->nbr_waits, STp->nbr_finished); 1380 #endif 1381 memset(cmd, 0, MAX_COMMAND_SIZE); 1382 cmd[0] = WRITE_FILEMARKS; 1383 if (STp->immediate_filemark) 1384 cmd[1] = 1; 1385 cmd[4] = 1 + STp->two_fm; 1386 1387 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 1388 STp->device->request_queue->rq_timeout, 1389 MAX_WRITE_RETRIES, 1); 1390 if (!SRpnt) { 1391 result = (STp->buffer)->syscall_result; 1392 goto out; 1393 } 1394 1395 if (STp->buffer->syscall_result == 0 || 1396 (cmdstatp->have_sense && !cmdstatp->deferred && 1397 (cmdstatp->flags & SENSE_EOM) && 1398 (cmdstatp->sense_hdr.sense_key == NO_SENSE || 1399 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) && 1400 (!cmdstatp->remainder_valid || cmdstatp->uremainder64 == 0))) { 1401 /* Write successful at EOM */ 1402 st_release_request(SRpnt); 1403 SRpnt = NULL; 1404 if (STps->drv_file >= 0) 1405 STps->drv_file++; 1406 STps->drv_block = 0; 1407 if (STp->two_fm) 1408 cross_eof(STp, 0); 1409 STps->eof = ST_FM; 1410 } 1411 else { /* Write error */ 1412 st_release_request(SRpnt); 1413 SRpnt = NULL; 1414 st_printk(KERN_ERR, STp, 1415 "Error on write filemark.\n"); 1416 if (result == 0) 1417 result = (-EIO); 1418 } 1419 1420 DEBC_printk(STp, "Buffer flushed, %d EOF(s) written\n", cmd[4]); 1421 } else if (!STp->rew_at_close) { 1422 STps = &(STp->ps[STp->partition]); 1423 if (!STm->sysv || STps->rw != ST_READING) { 1424 if (STp->can_bsr) 1425 result = flush_buffer(STp, 0); 1426 else if (STps->eof == ST_FM_HIT) { 1427 result = cross_eof(STp, 0); 1428 if (result) { 1429 if (STps->drv_file >= 0) 1430 STps->drv_file++; 1431 STps->drv_block = 0; 1432 STps->eof = ST_FM; 1433 } else 1434 STps->eof = ST_NOEOF; 1435 } 1436 } else if ((STps->eof == ST_NOEOF && 1437 !(result = cross_eof(STp, 1))) || 1438 STps->eof == ST_FM_HIT) { 1439 if (STps->drv_file >= 0) 1440 STps->drv_file++; 1441 STps->drv_block = 0; 1442 STps->eof = ST_FM; 1443 } 1444 } 1445 1446 out: 1447 if (STp->rew_at_close) { 1448 result2 = st_int_ioctl(STp, MTREW, 1); 1449 if (result == 0) 1450 result = result2; 1451 } 1452 return result; 1453 } 1454 1455 1456 /* Close the device and release it. BKL is not needed: this is the only thread 1457 accessing this tape. */ 1458 static int st_release(struct inode *inode, struct file *filp) 1459 { 1460 int result = 0; 1461 struct scsi_tape *STp = filp->private_data; 1462 1463 if (STp->door_locked == ST_LOCKED_AUTO) 1464 do_door_lock(STp, 0); 1465 1466 normalize_buffer(STp->buffer); 1467 spin_lock(&st_use_lock); 1468 STp->in_use = 0; 1469 spin_unlock(&st_use_lock); 1470 scsi_autopm_put_device(STp->device); 1471 scsi_tape_put(STp); 1472 1473 return result; 1474 } 1475 1476 /* The checks common to both reading and writing */ 1477 static ssize_t rw_checks(struct scsi_tape *STp, struct file *filp, size_t count) 1478 { 1479 ssize_t retval = 0; 1480 1481 /* 1482 * If we are in the middle of error recovery, don't let anyone 1483 * else try and use this device. Also, if error recovery fails, it 1484 * may try and take the device offline, in which case all further 1485 * access to the device is prohibited. 1486 */ 1487 if (!scsi_block_when_processing_errors(STp->device)) { 1488 retval = (-ENXIO); 1489 goto out; 1490 } 1491 1492 if (STp->ready != ST_READY) { 1493 if (STp->ready == ST_NO_TAPE) 1494 retval = (-ENOMEDIUM); 1495 else 1496 retval = (-EIO); 1497 goto out; 1498 } 1499 1500 if (! STp->modes[STp->current_mode].defined) { 1501 retval = (-ENXIO); 1502 goto out; 1503 } 1504 1505 1506 /* 1507 * If there was a bus reset, block further access 1508 * to this device. 1509 */ 1510 if (STp->pos_unknown) { 1511 retval = (-EIO); 1512 goto out; 1513 } 1514 1515 if (count == 0) 1516 goto out; 1517 1518 DEB( 1519 if (!STp->in_use) { 1520 st_printk(ST_DEB_MSG, STp, 1521 "Incorrect device.\n"); 1522 retval = (-EIO); 1523 goto out; 1524 } ) /* end DEB */ 1525 1526 if (STp->can_partitions && 1527 (retval = switch_partition(STp)) < 0) 1528 goto out; 1529 1530 if (STp->block_size == 0 && STp->max_block > 0 && 1531 (count < STp->min_block || count > STp->max_block)) { 1532 retval = (-EINVAL); 1533 goto out; 1534 } 1535 1536 if (STp->do_auto_lock && STp->door_locked == ST_UNLOCKED && 1537 !do_door_lock(STp, 1)) 1538 STp->door_locked = ST_LOCKED_AUTO; 1539 1540 out: 1541 return retval; 1542 } 1543 1544 1545 static int setup_buffering(struct scsi_tape *STp, const char __user *buf, 1546 size_t count, int is_read) 1547 { 1548 int i, bufsize, retval = 0; 1549 struct st_buffer *STbp = STp->buffer; 1550 1551 if (is_read) 1552 i = STp->try_dio_now && try_rdio; 1553 else 1554 i = STp->try_dio_now && try_wdio; 1555 1556 if (i && ((unsigned long)buf & queue_dma_alignment( 1557 STp->device->request_queue)) == 0) { 1558 i = sgl_map_user_pages(STbp, STbp->use_sg, (unsigned long)buf, 1559 count, (is_read ? READ : WRITE)); 1560 if (i > 0) { 1561 STbp->do_dio = i; 1562 STbp->buffer_bytes = 0; /* can be used as transfer counter */ 1563 } 1564 else 1565 STbp->do_dio = 0; /* fall back to buffering with any error */ 1566 STbp->sg_segs = STbp->do_dio; 1567 DEB( 1568 if (STbp->do_dio) { 1569 STp->nbr_dio++; 1570 STp->nbr_pages += STbp->do_dio; 1571 } 1572 ) 1573 } else 1574 STbp->do_dio = 0; 1575 DEB( STp->nbr_requests++; ) 1576 1577 if (!STbp->do_dio) { 1578 if (STp->block_size) 1579 bufsize = STp->block_size > st_fixed_buffer_size ? 1580 STp->block_size : st_fixed_buffer_size; 1581 else { 1582 bufsize = count; 1583 /* Make sure that data from previous user is not leaked even if 1584 HBA does not return correct residual */ 1585 if (is_read && STp->sili && !STbp->cleared) 1586 clear_buffer(STbp); 1587 } 1588 1589 if (bufsize > STbp->buffer_size && 1590 !enlarge_buffer(STbp, bufsize, STp->restr_dma)) { 1591 st_printk(KERN_WARNING, STp, 1592 "Can't allocate %d byte tape buffer.\n", 1593 bufsize); 1594 retval = (-EOVERFLOW); 1595 goto out; 1596 } 1597 if (STp->block_size) 1598 STbp->buffer_blocks = bufsize / STp->block_size; 1599 } 1600 1601 out: 1602 return retval; 1603 } 1604 1605 1606 /* Can be called more than once after each setup_buffer() */ 1607 static void release_buffering(struct scsi_tape *STp, int is_read) 1608 { 1609 struct st_buffer *STbp; 1610 1611 STbp = STp->buffer; 1612 if (STbp->do_dio) { 1613 sgl_unmap_user_pages(STbp, STbp->do_dio, is_read); 1614 STbp->do_dio = 0; 1615 STbp->sg_segs = 0; 1616 } 1617 } 1618 1619 1620 /* Write command */ 1621 static ssize_t 1622 st_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 1623 { 1624 ssize_t total; 1625 ssize_t i, do_count, blks, transfer; 1626 ssize_t retval; 1627 int undone, retry_eot = 0, scode; 1628 int async_write; 1629 unsigned char cmd[MAX_COMMAND_SIZE]; 1630 const char __user *b_point; 1631 struct st_request *SRpnt = NULL; 1632 struct scsi_tape *STp = filp->private_data; 1633 struct st_modedef *STm; 1634 struct st_partstat *STps; 1635 struct st_buffer *STbp; 1636 1637 if (mutex_lock_interruptible(&STp->lock)) 1638 return -ERESTARTSYS; 1639 1640 retval = rw_checks(STp, filp, count); 1641 if (retval || count == 0) 1642 goto out; 1643 1644 /* Write must be integral number of blocks */ 1645 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 1646 st_printk(KERN_WARNING, STp, 1647 "Write not multiple of tape block size.\n"); 1648 retval = (-EINVAL); 1649 goto out; 1650 } 1651 1652 STm = &(STp->modes[STp->current_mode]); 1653 STps = &(STp->ps[STp->partition]); 1654 1655 if (STp->write_prot) { 1656 retval = (-EACCES); 1657 goto out; 1658 } 1659 1660 1661 if (STps->rw == ST_READING) { 1662 retval = flush_buffer(STp, 0); 1663 if (retval) 1664 goto out; 1665 STps->rw = ST_WRITING; 1666 } else if (STps->rw != ST_WRITING && 1667 STps->drv_file == 0 && STps->drv_block == 0) { 1668 if ((retval = set_mode_densblk(STp, STm)) < 0) 1669 goto out; 1670 if (STm->default_compression != ST_DONT_TOUCH && 1671 !(STp->compression_changed)) { 1672 if (st_compression(STp, (STm->default_compression == ST_YES))) { 1673 st_printk(KERN_WARNING, STp, 1674 "Can't set default compression.\n"); 1675 if (modes_defined) { 1676 retval = (-EINVAL); 1677 goto out; 1678 } 1679 } 1680 } 1681 } 1682 1683 STbp = STp->buffer; 1684 i = write_behind_check(STp); 1685 if (i) { 1686 if (i == -ENOSPC) 1687 STps->eof = ST_EOM_OK; 1688 else 1689 STps->eof = ST_EOM_ERROR; 1690 } 1691 1692 if (STps->eof == ST_EOM_OK) { 1693 STps->eof = ST_EOD_1; /* allow next write */ 1694 retval = (-ENOSPC); 1695 goto out; 1696 } 1697 else if (STps->eof == ST_EOM_ERROR) { 1698 retval = (-EIO); 1699 goto out; 1700 } 1701 1702 /* Check the buffer readability in cases where copy_user might catch 1703 the problems after some tape movement. */ 1704 if (STp->block_size != 0 && 1705 !STbp->do_dio && 1706 (copy_from_user(&i, buf, 1) != 0 || 1707 copy_from_user(&i, buf + count - 1, 1) != 0)) { 1708 retval = (-EFAULT); 1709 goto out; 1710 } 1711 1712 retval = setup_buffering(STp, buf, count, 0); 1713 if (retval) 1714 goto out; 1715 1716 total = count; 1717 1718 memset(cmd, 0, MAX_COMMAND_SIZE); 1719 cmd[0] = WRITE_6; 1720 cmd[1] = (STp->block_size != 0); 1721 1722 STps->rw = ST_WRITING; 1723 1724 b_point = buf; 1725 while (count > 0 && !retry_eot) { 1726 1727 if (STbp->do_dio) { 1728 do_count = count; 1729 } 1730 else { 1731 if (STp->block_size == 0) 1732 do_count = count; 1733 else { 1734 do_count = STbp->buffer_blocks * STp->block_size - 1735 STbp->buffer_bytes; 1736 if (do_count > count) 1737 do_count = count; 1738 } 1739 1740 i = append_to_buffer(b_point, STbp, do_count); 1741 if (i) { 1742 retval = i; 1743 goto out; 1744 } 1745 } 1746 count -= do_count; 1747 b_point += do_count; 1748 1749 async_write = STp->block_size == 0 && !STbp->do_dio && 1750 STm->do_async_writes && STps->eof < ST_EOM_OK; 1751 1752 if (STp->block_size != 0 && STm->do_buffer_writes && 1753 !(STp->try_dio_now && try_wdio) && STps->eof < ST_EOM_OK && 1754 STbp->buffer_bytes < STbp->buffer_size) { 1755 STp->dirty = 1; 1756 /* Don't write a buffer that is not full enough. */ 1757 if (!async_write && count == 0) 1758 break; 1759 } 1760 1761 retry_write: 1762 if (STp->block_size == 0) 1763 blks = transfer = do_count; 1764 else { 1765 if (!STbp->do_dio) 1766 blks = STbp->buffer_bytes; 1767 else 1768 blks = do_count; 1769 blks /= STp->block_size; 1770 transfer = blks * STp->block_size; 1771 } 1772 cmd[2] = blks >> 16; 1773 cmd[3] = blks >> 8; 1774 cmd[4] = blks; 1775 1776 SRpnt = st_do_scsi(SRpnt, STp, cmd, transfer, DMA_TO_DEVICE, 1777 STp->device->request_queue->rq_timeout, 1778 MAX_WRITE_RETRIES, !async_write); 1779 if (!SRpnt) { 1780 retval = STbp->syscall_result; 1781 goto out; 1782 } 1783 if (async_write && !STbp->syscall_result) { 1784 STbp->writing = transfer; 1785 STp->dirty = !(STbp->writing == 1786 STbp->buffer_bytes); 1787 SRpnt = NULL; /* Prevent releasing this request! */ 1788 DEB( STp->write_pending = 1; ) 1789 break; 1790 } 1791 1792 if (STbp->syscall_result != 0) { 1793 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1794 1795 DEBC_printk(STp, "Error on write:\n"); 1796 if (cmdstatp->have_sense && (cmdstatp->flags & SENSE_EOM)) { 1797 scode = cmdstatp->sense_hdr.sense_key; 1798 if (cmdstatp->remainder_valid) 1799 undone = (int)cmdstatp->uremainder64; 1800 else if (STp->block_size == 0 && 1801 scode == VOLUME_OVERFLOW) 1802 undone = transfer; 1803 else 1804 undone = 0; 1805 if (STp->block_size != 0) 1806 undone *= STp->block_size; 1807 if (undone <= do_count) { 1808 /* Only data from this write is not written */ 1809 count += undone; 1810 b_point -= undone; 1811 do_count -= undone; 1812 if (STp->block_size) 1813 blks = (transfer - undone) / STp->block_size; 1814 STps->eof = ST_EOM_OK; 1815 /* Continue in fixed block mode if all written 1816 in this request but still something left to write 1817 (retval left to zero) 1818 */ 1819 if (STp->block_size == 0 || 1820 undone > 0 || count == 0) 1821 retval = (-ENOSPC); /* EOM within current request */ 1822 DEBC_printk(STp, "EOM with %d " 1823 "bytes unwritten.\n", 1824 (int)count); 1825 } else { 1826 /* EOT within data buffered earlier (possible only 1827 in fixed block mode without direct i/o) */ 1828 if (!retry_eot && !cmdstatp->deferred && 1829 (scode == NO_SENSE || scode == RECOVERED_ERROR)) { 1830 move_buffer_data(STp->buffer, transfer - undone); 1831 retry_eot = 1; 1832 if (STps->drv_block >= 0) { 1833 STps->drv_block += (transfer - undone) / 1834 STp->block_size; 1835 } 1836 STps->eof = ST_EOM_OK; 1837 DEBC_printk(STp, "Retry " 1838 "write of %d " 1839 "bytes at EOM.\n", 1840 STp->buffer->buffer_bytes); 1841 goto retry_write; 1842 } 1843 else { 1844 /* Either error within data buffered by driver or 1845 failed retry */ 1846 count -= do_count; 1847 blks = do_count = 0; 1848 STps->eof = ST_EOM_ERROR; 1849 STps->drv_block = (-1); /* Too cautious? */ 1850 retval = (-EIO); /* EOM for old data */ 1851 DEBC_printk(STp, "EOM with " 1852 "lost data.\n"); 1853 } 1854 } 1855 } else { 1856 count += do_count; 1857 STps->drv_block = (-1); /* Too cautious? */ 1858 retval = STbp->syscall_result; 1859 } 1860 1861 } 1862 1863 if (STps->drv_block >= 0) { 1864 if (STp->block_size == 0) 1865 STps->drv_block += (do_count > 0); 1866 else 1867 STps->drv_block += blks; 1868 } 1869 1870 STbp->buffer_bytes = 0; 1871 STp->dirty = 0; 1872 1873 if (retval || retry_eot) { 1874 if (count < total) 1875 retval = total - count; 1876 goto out; 1877 } 1878 } 1879 1880 if (STps->eof == ST_EOD_1) 1881 STps->eof = ST_EOM_OK; 1882 else if (STps->eof != ST_EOM_OK) 1883 STps->eof = ST_NOEOF; 1884 retval = total - count; 1885 1886 out: 1887 if (SRpnt != NULL) 1888 st_release_request(SRpnt); 1889 release_buffering(STp, 0); 1890 mutex_unlock(&STp->lock); 1891 1892 return retval; 1893 } 1894 1895 /* Read data from the tape. Returns zero in the normal case, one if the 1896 eof status has changed, and the negative error code in case of a 1897 fatal error. Otherwise updates the buffer and the eof state. 1898 1899 Does release user buffer mapping if it is set. 1900 */ 1901 static long read_tape(struct scsi_tape *STp, long count, 1902 struct st_request ** aSRpnt) 1903 { 1904 int transfer, blks, bytes; 1905 unsigned char cmd[MAX_COMMAND_SIZE]; 1906 struct st_request *SRpnt; 1907 struct st_modedef *STm; 1908 struct st_partstat *STps; 1909 struct st_buffer *STbp; 1910 int retval = 0; 1911 1912 if (count == 0) 1913 return 0; 1914 1915 STm = &(STp->modes[STp->current_mode]); 1916 STps = &(STp->ps[STp->partition]); 1917 if (STps->eof == ST_FM_HIT) 1918 return 1; 1919 STbp = STp->buffer; 1920 1921 if (STp->block_size == 0) 1922 blks = bytes = count; 1923 else { 1924 if (!(STp->try_dio_now && try_rdio) && STm->do_read_ahead) { 1925 blks = (STp->buffer)->buffer_blocks; 1926 bytes = blks * STp->block_size; 1927 } else { 1928 bytes = count; 1929 if (!STbp->do_dio && bytes > (STp->buffer)->buffer_size) 1930 bytes = (STp->buffer)->buffer_size; 1931 blks = bytes / STp->block_size; 1932 bytes = blks * STp->block_size; 1933 } 1934 } 1935 1936 memset(cmd, 0, MAX_COMMAND_SIZE); 1937 cmd[0] = READ_6; 1938 cmd[1] = (STp->block_size != 0); 1939 if (!cmd[1] && STp->sili) 1940 cmd[1] |= 2; 1941 cmd[2] = blks >> 16; 1942 cmd[3] = blks >> 8; 1943 cmd[4] = blks; 1944 1945 SRpnt = *aSRpnt; 1946 SRpnt = st_do_scsi(SRpnt, STp, cmd, bytes, DMA_FROM_DEVICE, 1947 STp->device->request_queue->rq_timeout, 1948 MAX_RETRIES, 1); 1949 release_buffering(STp, 1); 1950 *aSRpnt = SRpnt; 1951 if (!SRpnt) 1952 return STbp->syscall_result; 1953 1954 STbp->read_pointer = 0; 1955 STps->at_sm = 0; 1956 1957 /* Something to check */ 1958 if (STbp->syscall_result) { 1959 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 1960 1961 retval = 1; 1962 DEBC_printk(STp, 1963 "Sense: %2x %2x %2x %2x %2x %2x %2x %2x\n", 1964 SRpnt->sense[0], SRpnt->sense[1], 1965 SRpnt->sense[2], SRpnt->sense[3], 1966 SRpnt->sense[4], SRpnt->sense[5], 1967 SRpnt->sense[6], SRpnt->sense[7]); 1968 if (cmdstatp->have_sense) { 1969 1970 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 1971 cmdstatp->flags &= 0xcf; /* No need for EOM in this case */ 1972 1973 if (cmdstatp->flags != 0) { /* EOF, EOM, or ILI */ 1974 /* Compute the residual count */ 1975 if (cmdstatp->remainder_valid) 1976 transfer = (int)cmdstatp->uremainder64; 1977 else 1978 transfer = 0; 1979 if (cmdstatp->sense_hdr.sense_key == MEDIUM_ERROR) { 1980 if (STp->block_size == 0) 1981 transfer = bytes; 1982 /* Some drives set ILI with MEDIUM ERROR */ 1983 cmdstatp->flags &= ~SENSE_ILI; 1984 } 1985 1986 if (cmdstatp->flags & SENSE_ILI) { /* ILI */ 1987 if (STp->block_size == 0 && 1988 transfer < 0) { 1989 st_printk(KERN_NOTICE, STp, 1990 "Failed to read %d " 1991 "byte block with %d " 1992 "byte transfer.\n", 1993 bytes - transfer, 1994 bytes); 1995 if (STps->drv_block >= 0) 1996 STps->drv_block += 1; 1997 STbp->buffer_bytes = 0; 1998 return (-ENOMEM); 1999 } else if (STp->block_size == 0) { 2000 STbp->buffer_bytes = bytes - transfer; 2001 } else { 2002 st_release_request(SRpnt); 2003 SRpnt = *aSRpnt = NULL; 2004 if (transfer == blks) { /* We did not get anything, error */ 2005 st_printk(KERN_NOTICE, STp, 2006 "Incorrect " 2007 "block size.\n"); 2008 if (STps->drv_block >= 0) 2009 STps->drv_block += blks - transfer + 1; 2010 st_int_ioctl(STp, MTBSR, 1); 2011 return (-EIO); 2012 } 2013 /* We have some data, deliver it */ 2014 STbp->buffer_bytes = (blks - transfer) * 2015 STp->block_size; 2016 DEBC_printk(STp, "ILI but " 2017 "enough data " 2018 "received %ld " 2019 "%d.\n", count, 2020 STbp->buffer_bytes); 2021 if (STps->drv_block >= 0) 2022 STps->drv_block += 1; 2023 if (st_int_ioctl(STp, MTBSR, 1)) 2024 return (-EIO); 2025 } 2026 } else if (cmdstatp->flags & SENSE_FMK) { /* FM overrides EOM */ 2027 if (STps->eof != ST_FM_HIT) 2028 STps->eof = ST_FM_HIT; 2029 else 2030 STps->eof = ST_EOD_2; 2031 if (STp->block_size == 0) 2032 STbp->buffer_bytes = 0; 2033 else 2034 STbp->buffer_bytes = 2035 bytes - transfer * STp->block_size; 2036 DEBC_printk(STp, "EOF detected (%d " 2037 "bytes read).\n", 2038 STbp->buffer_bytes); 2039 } else if (cmdstatp->flags & SENSE_EOM) { 2040 if (STps->eof == ST_FM) 2041 STps->eof = ST_EOD_1; 2042 else 2043 STps->eof = ST_EOM_OK; 2044 if (STp->block_size == 0) 2045 STbp->buffer_bytes = bytes - transfer; 2046 else 2047 STbp->buffer_bytes = 2048 bytes - transfer * STp->block_size; 2049 2050 DEBC_printk(STp, "EOM detected (%d " 2051 "bytes read).\n", 2052 STbp->buffer_bytes); 2053 } 2054 } 2055 /* end of EOF, EOM, ILI test */ 2056 else { /* nonzero sense key */ 2057 DEBC_printk(STp, "Tape error while reading.\n"); 2058 STps->drv_block = (-1); 2059 if (STps->eof == ST_FM && 2060 cmdstatp->sense_hdr.sense_key == BLANK_CHECK) { 2061 DEBC_printk(STp, "Zero returned for " 2062 "first BLANK CHECK " 2063 "after EOF.\n"); 2064 STps->eof = ST_EOD_2; /* First BLANK_CHECK after FM */ 2065 } else /* Some other extended sense code */ 2066 retval = (-EIO); 2067 } 2068 2069 if (STbp->buffer_bytes < 0) /* Caused by bogus sense data */ 2070 STbp->buffer_bytes = 0; 2071 } 2072 /* End of extended sense test */ 2073 else { /* Non-extended sense */ 2074 retval = STbp->syscall_result; 2075 } 2076 2077 } 2078 /* End of error handling */ 2079 else { /* Read successful */ 2080 STbp->buffer_bytes = bytes; 2081 if (STp->sili) /* In fixed block mode residual is always zero here */ 2082 STbp->buffer_bytes -= STp->buffer->cmdstat.residual; 2083 } 2084 2085 if (STps->drv_block >= 0) { 2086 if (STp->block_size == 0) 2087 STps->drv_block++; 2088 else 2089 STps->drv_block += STbp->buffer_bytes / STp->block_size; 2090 } 2091 return retval; 2092 } 2093 2094 2095 /* Read command */ 2096 static ssize_t 2097 st_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 2098 { 2099 ssize_t total; 2100 ssize_t retval = 0; 2101 ssize_t i, transfer; 2102 int special, do_dio = 0; 2103 struct st_request *SRpnt = NULL; 2104 struct scsi_tape *STp = filp->private_data; 2105 struct st_modedef *STm; 2106 struct st_partstat *STps; 2107 struct st_buffer *STbp = STp->buffer; 2108 2109 if (mutex_lock_interruptible(&STp->lock)) 2110 return -ERESTARTSYS; 2111 2112 retval = rw_checks(STp, filp, count); 2113 if (retval || count == 0) 2114 goto out; 2115 2116 STm = &(STp->modes[STp->current_mode]); 2117 if (STp->block_size != 0 && (count % STp->block_size) != 0) { 2118 if (!STm->do_read_ahead) { 2119 retval = (-EINVAL); /* Read must be integral number of blocks */ 2120 goto out; 2121 } 2122 STp->try_dio_now = 0; /* Direct i/o can't handle split blocks */ 2123 } 2124 2125 STps = &(STp->ps[STp->partition]); 2126 if (STps->rw == ST_WRITING) { 2127 retval = flush_buffer(STp, 0); 2128 if (retval) 2129 goto out; 2130 STps->rw = ST_READING; 2131 } 2132 DEB( 2133 if (debugging && STps->eof != ST_NOEOF) 2134 st_printk(ST_DEB_MSG, STp, 2135 "EOF/EOM flag up (%d). Bytes %d\n", 2136 STps->eof, STbp->buffer_bytes); 2137 ) /* end DEB */ 2138 2139 retval = setup_buffering(STp, buf, count, 1); 2140 if (retval) 2141 goto out; 2142 do_dio = STbp->do_dio; 2143 2144 if (STbp->buffer_bytes == 0 && 2145 STps->eof >= ST_EOD_1) { 2146 if (STps->eof < ST_EOD) { 2147 STps->eof += 1; 2148 retval = 0; 2149 goto out; 2150 } 2151 retval = (-EIO); /* EOM or Blank Check */ 2152 goto out; 2153 } 2154 2155 if (do_dio) { 2156 /* Check the buffer writability before any tape movement. Don't alter 2157 buffer data. */ 2158 if (copy_from_user(&i, buf, 1) != 0 || 2159 copy_to_user(buf, &i, 1) != 0 || 2160 copy_from_user(&i, buf + count - 1, 1) != 0 || 2161 copy_to_user(buf + count - 1, &i, 1) != 0) { 2162 retval = (-EFAULT); 2163 goto out; 2164 } 2165 } 2166 2167 STps->rw = ST_READING; 2168 2169 2170 /* Loop until enough data in buffer or a special condition found */ 2171 for (total = 0, special = 0; total < count && !special;) { 2172 2173 /* Get new data if the buffer is empty */ 2174 if (STbp->buffer_bytes == 0) { 2175 special = read_tape(STp, count - total, &SRpnt); 2176 if (special < 0) { /* No need to continue read */ 2177 retval = special; 2178 goto out; 2179 } 2180 } 2181 2182 /* Move the data from driver buffer to user buffer */ 2183 if (STbp->buffer_bytes > 0) { 2184 DEB( 2185 if (debugging && STps->eof != ST_NOEOF) 2186 st_printk(ST_DEB_MSG, STp, 2187 "EOF up (%d). Left %d, needed %d.\n", 2188 STps->eof, STbp->buffer_bytes, 2189 (int)(count - total)); 2190 ) /* end DEB */ 2191 transfer = STbp->buffer_bytes < count - total ? 2192 STbp->buffer_bytes : count - total; 2193 if (!do_dio) { 2194 i = from_buffer(STbp, buf, transfer); 2195 if (i) { 2196 retval = i; 2197 goto out; 2198 } 2199 } 2200 buf += transfer; 2201 total += transfer; 2202 } 2203 2204 if (STp->block_size == 0) 2205 break; /* Read only one variable length block */ 2206 2207 } /* for (total = 0, special = 0; 2208 total < count && !special; ) */ 2209 2210 /* Change the eof state if no data from tape or buffer */ 2211 if (total == 0) { 2212 if (STps->eof == ST_FM_HIT) { 2213 STps->eof = ST_FM; 2214 STps->drv_block = 0; 2215 if (STps->drv_file >= 0) 2216 STps->drv_file++; 2217 } else if (STps->eof == ST_EOD_1) { 2218 STps->eof = ST_EOD_2; 2219 STps->drv_block = 0; 2220 if (STps->drv_file >= 0) 2221 STps->drv_file++; 2222 } else if (STps->eof == ST_EOD_2) 2223 STps->eof = ST_EOD; 2224 } else if (STps->eof == ST_FM) 2225 STps->eof = ST_NOEOF; 2226 retval = total; 2227 2228 out: 2229 if (SRpnt != NULL) { 2230 st_release_request(SRpnt); 2231 SRpnt = NULL; 2232 } 2233 if (do_dio) { 2234 release_buffering(STp, 1); 2235 STbp->buffer_bytes = 0; 2236 } 2237 mutex_unlock(&STp->lock); 2238 2239 return retval; 2240 } 2241 2242 2243 2244 DEB( 2245 /* Set the driver options */ 2246 static void st_log_options(struct scsi_tape * STp, struct st_modedef * STm) 2247 { 2248 if (debugging) { 2249 st_printk(KERN_INFO, STp, 2250 "Mode %d options: buffer writes: %d, " 2251 "async writes: %d, read ahead: %d\n", 2252 STp->current_mode, STm->do_buffer_writes, 2253 STm->do_async_writes, STm->do_read_ahead); 2254 st_printk(KERN_INFO, STp, 2255 " can bsr: %d, two FMs: %d, " 2256 "fast mteom: %d, auto lock: %d,\n", 2257 STp->can_bsr, STp->two_fm, STp->fast_mteom, 2258 STp->do_auto_lock); 2259 st_printk(KERN_INFO, STp, 2260 " defs for wr: %d, no block limits: %d, " 2261 "partitions: %d, s2 log: %d\n", 2262 STm->defaults_for_writes, STp->omit_blklims, 2263 STp->can_partitions, STp->scsi2_logical); 2264 st_printk(KERN_INFO, STp, 2265 " sysv: %d nowait: %d sili: %d " 2266 "nowait_filemark: %d\n", 2267 STm->sysv, STp->immediate, STp->sili, 2268 STp->immediate_filemark); 2269 st_printk(KERN_INFO, STp, " debugging: %d\n", debugging); 2270 } 2271 } 2272 ) 2273 2274 2275 static int st_set_options(struct scsi_tape *STp, long options) 2276 { 2277 int value; 2278 long code; 2279 struct st_modedef *STm; 2280 struct cdev *cd0, *cd1; 2281 struct device *d0, *d1; 2282 2283 STm = &(STp->modes[STp->current_mode]); 2284 if (!STm->defined) { 2285 cd0 = STm->cdevs[0]; 2286 cd1 = STm->cdevs[1]; 2287 d0 = STm->devs[0]; 2288 d1 = STm->devs[1]; 2289 memcpy(STm, &(STp->modes[0]), sizeof(struct st_modedef)); 2290 STm->cdevs[0] = cd0; 2291 STm->cdevs[1] = cd1; 2292 STm->devs[0] = d0; 2293 STm->devs[1] = d1; 2294 modes_defined = 1; 2295 DEBC_printk(STp, "Initialized mode %d definition from mode 0\n", 2296 STp->current_mode); 2297 } 2298 2299 code = options & MT_ST_OPTIONS; 2300 if (code == MT_ST_BOOLEANS) { 2301 STm->do_buffer_writes = (options & MT_ST_BUFFER_WRITES) != 0; 2302 STm->do_async_writes = (options & MT_ST_ASYNC_WRITES) != 0; 2303 STm->defaults_for_writes = (options & MT_ST_DEF_WRITES) != 0; 2304 STm->do_read_ahead = (options & MT_ST_READ_AHEAD) != 0; 2305 STp->two_fm = (options & MT_ST_TWO_FM) != 0; 2306 STp->fast_mteom = (options & MT_ST_FAST_MTEOM) != 0; 2307 STp->do_auto_lock = (options & MT_ST_AUTO_LOCK) != 0; 2308 STp->can_bsr = (options & MT_ST_CAN_BSR) != 0; 2309 STp->omit_blklims = (options & MT_ST_NO_BLKLIMS) != 0; 2310 if ((STp->device)->scsi_level >= SCSI_2) 2311 STp->can_partitions = (options & MT_ST_CAN_PARTITIONS) != 0; 2312 STp->scsi2_logical = (options & MT_ST_SCSI2LOGICAL) != 0; 2313 STp->immediate = (options & MT_ST_NOWAIT) != 0; 2314 STp->immediate_filemark = (options & MT_ST_NOWAIT_EOF) != 0; 2315 STm->sysv = (options & MT_ST_SYSV) != 0; 2316 STp->sili = (options & MT_ST_SILI) != 0; 2317 DEB( debugging = (options & MT_ST_DEBUGGING) != 0; 2318 st_log_options(STp, STm); ) 2319 } else if (code == MT_ST_SETBOOLEANS || code == MT_ST_CLEARBOOLEANS) { 2320 value = (code == MT_ST_SETBOOLEANS); 2321 if ((options & MT_ST_BUFFER_WRITES) != 0) 2322 STm->do_buffer_writes = value; 2323 if ((options & MT_ST_ASYNC_WRITES) != 0) 2324 STm->do_async_writes = value; 2325 if ((options & MT_ST_DEF_WRITES) != 0) 2326 STm->defaults_for_writes = value; 2327 if ((options & MT_ST_READ_AHEAD) != 0) 2328 STm->do_read_ahead = value; 2329 if ((options & MT_ST_TWO_FM) != 0) 2330 STp->two_fm = value; 2331 if ((options & MT_ST_FAST_MTEOM) != 0) 2332 STp->fast_mteom = value; 2333 if ((options & MT_ST_AUTO_LOCK) != 0) 2334 STp->do_auto_lock = value; 2335 if ((options & MT_ST_CAN_BSR) != 0) 2336 STp->can_bsr = value; 2337 if ((options & MT_ST_NO_BLKLIMS) != 0) 2338 STp->omit_blklims = value; 2339 if ((STp->device)->scsi_level >= SCSI_2 && 2340 (options & MT_ST_CAN_PARTITIONS) != 0) 2341 STp->can_partitions = value; 2342 if ((options & MT_ST_SCSI2LOGICAL) != 0) 2343 STp->scsi2_logical = value; 2344 if ((options & MT_ST_NOWAIT) != 0) 2345 STp->immediate = value; 2346 if ((options & MT_ST_NOWAIT_EOF) != 0) 2347 STp->immediate_filemark = value; 2348 if ((options & MT_ST_SYSV) != 0) 2349 STm->sysv = value; 2350 if ((options & MT_ST_SILI) != 0) 2351 STp->sili = value; 2352 DEB( 2353 if ((options & MT_ST_DEBUGGING) != 0) 2354 debugging = value; 2355 st_log_options(STp, STm); ) 2356 } else if (code == MT_ST_WRITE_THRESHOLD) { 2357 /* Retained for compatibility */ 2358 } else if (code == MT_ST_DEF_BLKSIZE) { 2359 value = (options & ~MT_ST_OPTIONS); 2360 if (value == ~MT_ST_OPTIONS) { 2361 STm->default_blksize = (-1); 2362 DEBC_printk(STp, "Default block size disabled.\n"); 2363 } else { 2364 STm->default_blksize = value; 2365 DEBC_printk(STp,"Default block size set to " 2366 "%d bytes.\n", STm->default_blksize); 2367 if (STp->ready == ST_READY) { 2368 STp->blksize_changed = 0; 2369 set_mode_densblk(STp, STm); 2370 } 2371 } 2372 } else if (code == MT_ST_TIMEOUTS) { 2373 value = (options & ~MT_ST_OPTIONS); 2374 if ((value & MT_ST_SET_LONG_TIMEOUT) != 0) { 2375 STp->long_timeout = (value & ~MT_ST_SET_LONG_TIMEOUT) * HZ; 2376 DEBC_printk(STp, "Long timeout set to %d seconds.\n", 2377 (value & ~MT_ST_SET_LONG_TIMEOUT)); 2378 } else { 2379 blk_queue_rq_timeout(STp->device->request_queue, 2380 value * HZ); 2381 DEBC_printk(STp, "Normal timeout set to %d seconds.\n", 2382 value); 2383 } 2384 } else if (code == MT_ST_SET_CLN) { 2385 value = (options & ~MT_ST_OPTIONS) & 0xff; 2386 if (value != 0 && 2387 (value < EXTENDED_SENSE_START || 2388 value >= SCSI_SENSE_BUFFERSIZE)) 2389 return (-EINVAL); 2390 STp->cln_mode = value; 2391 STp->cln_sense_mask = (options >> 8) & 0xff; 2392 STp->cln_sense_value = (options >> 16) & 0xff; 2393 st_printk(KERN_INFO, STp, 2394 "Cleaning request mode %d, mask %02x, value %02x\n", 2395 value, STp->cln_sense_mask, STp->cln_sense_value); 2396 } else if (code == MT_ST_DEF_OPTIONS) { 2397 code = (options & ~MT_ST_CLEAR_DEFAULT); 2398 value = (options & MT_ST_CLEAR_DEFAULT); 2399 if (code == MT_ST_DEF_DENSITY) { 2400 if (value == MT_ST_CLEAR_DEFAULT) { 2401 STm->default_density = (-1); 2402 DEBC_printk(STp, 2403 "Density default disabled.\n"); 2404 } else { 2405 STm->default_density = value & 0xff; 2406 DEBC_printk(STp, "Density default set to %x\n", 2407 STm->default_density); 2408 if (STp->ready == ST_READY) { 2409 STp->density_changed = 0; 2410 set_mode_densblk(STp, STm); 2411 } 2412 } 2413 } else if (code == MT_ST_DEF_DRVBUFFER) { 2414 if (value == MT_ST_CLEAR_DEFAULT) { 2415 STp->default_drvbuffer = 0xff; 2416 DEBC_printk(STp, 2417 "Drive buffer default disabled.\n"); 2418 } else { 2419 STp->default_drvbuffer = value & 7; 2420 DEBC_printk(STp, 2421 "Drive buffer default set to %x\n", 2422 STp->default_drvbuffer); 2423 if (STp->ready == ST_READY) 2424 st_int_ioctl(STp, MTSETDRVBUFFER, STp->default_drvbuffer); 2425 } 2426 } else if (code == MT_ST_DEF_COMPRESSION) { 2427 if (value == MT_ST_CLEAR_DEFAULT) { 2428 STm->default_compression = ST_DONT_TOUCH; 2429 DEBC_printk(STp, 2430 "Compression default disabled.\n"); 2431 } else { 2432 if ((value & 0xff00) != 0) { 2433 STp->c_algo = (value & 0xff00) >> 8; 2434 DEBC_printk(STp, "Compression " 2435 "algorithm set to 0x%x.\n", 2436 STp->c_algo); 2437 } 2438 if ((value & 0xff) != 0xff) { 2439 STm->default_compression = (value & 1 ? ST_YES : ST_NO); 2440 DEBC_printk(STp, "Compression default " 2441 "set to %x\n", 2442 (value & 1)); 2443 if (STp->ready == ST_READY) { 2444 STp->compression_changed = 0; 2445 st_compression(STp, (STm->default_compression == ST_YES)); 2446 } 2447 } 2448 } 2449 } 2450 } else 2451 return (-EIO); 2452 2453 return 0; 2454 } 2455 2456 #define MODE_HEADER_LENGTH 4 2457 2458 /* Mode header and page byte offsets */ 2459 #define MH_OFF_DATA_LENGTH 0 2460 #define MH_OFF_MEDIUM_TYPE 1 2461 #define MH_OFF_DEV_SPECIFIC 2 2462 #define MH_OFF_BDESCS_LENGTH 3 2463 #define MP_OFF_PAGE_NBR 0 2464 #define MP_OFF_PAGE_LENGTH 1 2465 2466 /* Mode header and page bit masks */ 2467 #define MH_BIT_WP 0x80 2468 #define MP_MSK_PAGE_NBR 0x3f 2469 2470 /* Don't return block descriptors */ 2471 #define MODE_SENSE_OMIT_BDESCS 0x08 2472 2473 #define MODE_SELECT_PAGE_FORMAT 0x10 2474 2475 /* Read a mode page into the tape buffer. The block descriptors are included 2476 if incl_block_descs is true. The page control is ored to the page number 2477 parameter, if necessary. */ 2478 static int read_mode_page(struct scsi_tape *STp, int page, int omit_block_descs) 2479 { 2480 unsigned char cmd[MAX_COMMAND_SIZE]; 2481 struct st_request *SRpnt; 2482 2483 memset(cmd, 0, MAX_COMMAND_SIZE); 2484 cmd[0] = MODE_SENSE; 2485 if (omit_block_descs) 2486 cmd[1] = MODE_SENSE_OMIT_BDESCS; 2487 cmd[2] = page; 2488 cmd[4] = 255; 2489 2490 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_FROM_DEVICE, 2491 STp->device->request_queue->rq_timeout, 0, 1); 2492 if (SRpnt == NULL) 2493 return (STp->buffer)->syscall_result; 2494 2495 st_release_request(SRpnt); 2496 2497 return STp->buffer->syscall_result; 2498 } 2499 2500 2501 /* Send the mode page in the tape buffer to the drive. Assumes that the mode data 2502 in the buffer is correctly formatted. The long timeout is used if slow is non-zero. */ 2503 static int write_mode_page(struct scsi_tape *STp, int page, int slow) 2504 { 2505 int pgo; 2506 unsigned char cmd[MAX_COMMAND_SIZE]; 2507 struct st_request *SRpnt; 2508 int timeout; 2509 2510 memset(cmd, 0, MAX_COMMAND_SIZE); 2511 cmd[0] = MODE_SELECT; 2512 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2513 pgo = MODE_HEADER_LENGTH + (STp->buffer)->b_data[MH_OFF_BDESCS_LENGTH]; 2514 cmd[4] = pgo + (STp->buffer)->b_data[pgo + MP_OFF_PAGE_LENGTH] + 2; 2515 2516 /* Clear reserved fields */ 2517 (STp->buffer)->b_data[MH_OFF_DATA_LENGTH] = 0; 2518 (STp->buffer)->b_data[MH_OFF_MEDIUM_TYPE] = 0; 2519 (STp->buffer)->b_data[MH_OFF_DEV_SPECIFIC] &= ~MH_BIT_WP; 2520 (STp->buffer)->b_data[pgo + MP_OFF_PAGE_NBR] &= MP_MSK_PAGE_NBR; 2521 2522 timeout = slow ? 2523 STp->long_timeout : STp->device->request_queue->rq_timeout; 2524 SRpnt = st_do_scsi(NULL, STp, cmd, cmd[4], DMA_TO_DEVICE, 2525 timeout, 0, 1); 2526 if (SRpnt == NULL) 2527 return (STp->buffer)->syscall_result; 2528 2529 st_release_request(SRpnt); 2530 2531 return STp->buffer->syscall_result; 2532 } 2533 2534 2535 #define COMPRESSION_PAGE 0x0f 2536 #define COMPRESSION_PAGE_LENGTH 16 2537 2538 #define CP_OFF_DCE_DCC 2 2539 #define CP_OFF_C_ALGO 7 2540 2541 #define DCE_MASK 0x80 2542 #define DCC_MASK 0x40 2543 #define RED_MASK 0x60 2544 2545 2546 /* Control the compression with mode page 15. Algorithm not changed if zero. 2547 2548 The block descriptors are read and written because Sony SDT-7000 does not 2549 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 2550 Including block descriptors should not cause any harm to other drives. */ 2551 2552 static int st_compression(struct scsi_tape * STp, int state) 2553 { 2554 int retval; 2555 int mpoffs; /* Offset to mode page start */ 2556 unsigned char *b_data = (STp->buffer)->b_data; 2557 2558 if (STp->ready != ST_READY) 2559 return (-EIO); 2560 2561 /* Read the current page contents */ 2562 retval = read_mode_page(STp, COMPRESSION_PAGE, 0); 2563 if (retval) { 2564 DEBC_printk(STp, "Compression mode page not supported.\n"); 2565 return (-EIO); 2566 } 2567 2568 mpoffs = MODE_HEADER_LENGTH + b_data[MH_OFF_BDESCS_LENGTH]; 2569 DEBC_printk(STp, "Compression state is %d.\n", 2570 (b_data[mpoffs + CP_OFF_DCE_DCC] & DCE_MASK ? 1 : 0)); 2571 2572 /* Check if compression can be changed */ 2573 if ((b_data[mpoffs + CP_OFF_DCE_DCC] & DCC_MASK) == 0) { 2574 DEBC_printk(STp, "Compression not supported.\n"); 2575 return (-EIO); 2576 } 2577 2578 /* Do the change */ 2579 if (state) { 2580 b_data[mpoffs + CP_OFF_DCE_DCC] |= DCE_MASK; 2581 if (STp->c_algo != 0) 2582 b_data[mpoffs + CP_OFF_C_ALGO] = STp->c_algo; 2583 } 2584 else { 2585 b_data[mpoffs + CP_OFF_DCE_DCC] &= ~DCE_MASK; 2586 if (STp->c_algo != 0) 2587 b_data[mpoffs + CP_OFF_C_ALGO] = 0; /* no compression */ 2588 } 2589 2590 retval = write_mode_page(STp, COMPRESSION_PAGE, 0); 2591 if (retval) { 2592 DEBC_printk(STp, "Compression change failed.\n"); 2593 return (-EIO); 2594 } 2595 DEBC_printk(STp, "Compression state changed to %d.\n", state); 2596 2597 STp->compression_changed = 1; 2598 return 0; 2599 } 2600 2601 2602 /* Process the load and unload commands (does unload if the load code is zero) */ 2603 static int do_load_unload(struct scsi_tape *STp, struct file *filp, int load_code) 2604 { 2605 int retval = (-EIO), timeout; 2606 unsigned char cmd[MAX_COMMAND_SIZE]; 2607 struct st_partstat *STps; 2608 struct st_request *SRpnt; 2609 2610 if (STp->ready != ST_READY && !load_code) { 2611 if (STp->ready == ST_NO_TAPE) 2612 return (-ENOMEDIUM); 2613 else 2614 return (-EIO); 2615 } 2616 2617 memset(cmd, 0, MAX_COMMAND_SIZE); 2618 cmd[0] = START_STOP; 2619 if (load_code) 2620 cmd[4] |= 1; 2621 /* 2622 * If arg >= 1 && arg <= 6 Enhanced load/unload in HP C1553A 2623 */ 2624 if (load_code >= 1 + MT_ST_HPLOADER_OFFSET 2625 && load_code <= 6 + MT_ST_HPLOADER_OFFSET) { 2626 DEBC_printk(STp, " Enhanced %sload slot %2d.\n", 2627 (cmd[4]) ? "" : "un", 2628 load_code - MT_ST_HPLOADER_OFFSET); 2629 cmd[3] = load_code - MT_ST_HPLOADER_OFFSET; /* MediaID field of C1553A */ 2630 } 2631 if (STp->immediate) { 2632 cmd[1] = 1; /* Don't wait for completion */ 2633 timeout = STp->device->request_queue->rq_timeout; 2634 } 2635 else 2636 timeout = STp->long_timeout; 2637 2638 DEBC( 2639 if (!load_code) 2640 st_printk(ST_DEB_MSG, STp, "Unloading tape.\n"); 2641 else 2642 st_printk(ST_DEB_MSG, STp, "Loading tape.\n"); 2643 ); 2644 2645 SRpnt = st_do_scsi(NULL, STp, cmd, 0, DMA_NONE, 2646 timeout, MAX_RETRIES, 1); 2647 if (!SRpnt) 2648 return (STp->buffer)->syscall_result; 2649 2650 retval = (STp->buffer)->syscall_result; 2651 st_release_request(SRpnt); 2652 2653 if (!retval) { /* SCSI command successful */ 2654 2655 if (!load_code) { 2656 STp->rew_at_close = 0; 2657 STp->ready = ST_NO_TAPE; 2658 } 2659 else { 2660 STp->rew_at_close = STp->autorew_dev; 2661 retval = check_tape(STp, filp); 2662 if (retval > 0) 2663 retval = 0; 2664 } 2665 } 2666 else { 2667 STps = &(STp->ps[STp->partition]); 2668 STps->drv_file = STps->drv_block = (-1); 2669 } 2670 2671 return retval; 2672 } 2673 2674 #if DEBUG 2675 #define ST_DEB_FORWARD 0 2676 #define ST_DEB_BACKWARD 1 2677 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) 2678 { 2679 s32 sc; 2680 2681 if (!debugging) 2682 return; 2683 2684 sc = sign_extend32(get_unaligned_be24(&cmd[2]), 23); 2685 if (direction) 2686 sc = -sc; 2687 st_printk(ST_DEB_MSG, STp, "Spacing tape %s over %d %s.\n", 2688 direction ? "backward" : "forward", sc, units); 2689 } 2690 #else 2691 #define ST_DEB_FORWARD 0 2692 #define ST_DEB_BACKWARD 1 2693 static void deb_space_print(struct scsi_tape *STp, int direction, char *units, unsigned char *cmd) {} 2694 #endif 2695 2696 2697 /* Internal ioctl function */ 2698 static int st_int_ioctl(struct scsi_tape *STp, unsigned int cmd_in, unsigned long arg) 2699 { 2700 int timeout; 2701 long ltmp; 2702 int ioctl_result; 2703 int chg_eof = 1; 2704 unsigned char cmd[MAX_COMMAND_SIZE]; 2705 struct st_request *SRpnt; 2706 struct st_partstat *STps; 2707 int fileno, blkno, at_sm, undone; 2708 int datalen = 0, direction = DMA_NONE; 2709 2710 WARN_ON(STp->buffer->do_dio != 0); 2711 if (STp->ready != ST_READY) { 2712 if (STp->ready == ST_NO_TAPE) 2713 return (-ENOMEDIUM); 2714 else 2715 return (-EIO); 2716 } 2717 timeout = STp->long_timeout; 2718 STps = &(STp->ps[STp->partition]); 2719 fileno = STps->drv_file; 2720 blkno = STps->drv_block; 2721 at_sm = STps->at_sm; 2722 2723 memset(cmd, 0, MAX_COMMAND_SIZE); 2724 switch (cmd_in) { 2725 case MTFSFM: 2726 chg_eof = 0; /* Changed from the FSF after this */ 2727 /* fall through */ 2728 case MTFSF: 2729 cmd[0] = SPACE; 2730 cmd[1] = 0x01; /* Space FileMarks */ 2731 cmd[2] = (arg >> 16); 2732 cmd[3] = (arg >> 8); 2733 cmd[4] = arg; 2734 deb_space_print(STp, ST_DEB_FORWARD, "filemarks", cmd); 2735 if (fileno >= 0) 2736 fileno += arg; 2737 blkno = 0; 2738 at_sm &= (arg == 0); 2739 break; 2740 case MTBSFM: 2741 chg_eof = 0; /* Changed from the FSF after this */ 2742 /* fall through */ 2743 case MTBSF: 2744 cmd[0] = SPACE; 2745 cmd[1] = 0x01; /* Space FileMarks */ 2746 ltmp = (-arg); 2747 cmd[2] = (ltmp >> 16); 2748 cmd[3] = (ltmp >> 8); 2749 cmd[4] = ltmp; 2750 deb_space_print(STp, ST_DEB_BACKWARD, "filemarks", cmd); 2751 if (fileno >= 0) 2752 fileno -= arg; 2753 blkno = (-1); /* We can't know the block number */ 2754 at_sm &= (arg == 0); 2755 break; 2756 case MTFSR: 2757 cmd[0] = SPACE; 2758 cmd[1] = 0x00; /* Space Blocks */ 2759 cmd[2] = (arg >> 16); 2760 cmd[3] = (arg >> 8); 2761 cmd[4] = arg; 2762 deb_space_print(STp, ST_DEB_FORWARD, "blocks", cmd); 2763 if (blkno >= 0) 2764 blkno += arg; 2765 at_sm &= (arg == 0); 2766 break; 2767 case MTBSR: 2768 cmd[0] = SPACE; 2769 cmd[1] = 0x00; /* Space Blocks */ 2770 ltmp = (-arg); 2771 cmd[2] = (ltmp >> 16); 2772 cmd[3] = (ltmp >> 8); 2773 cmd[4] = ltmp; 2774 deb_space_print(STp, ST_DEB_BACKWARD, "blocks", cmd); 2775 if (blkno >= 0) 2776 blkno -= arg; 2777 at_sm &= (arg == 0); 2778 break; 2779 case MTFSS: 2780 cmd[0] = SPACE; 2781 cmd[1] = 0x04; /* Space Setmarks */ 2782 cmd[2] = (arg >> 16); 2783 cmd[3] = (arg >> 8); 2784 cmd[4] = arg; 2785 deb_space_print(STp, ST_DEB_FORWARD, "setmarks", cmd); 2786 if (arg != 0) { 2787 blkno = fileno = (-1); 2788 at_sm = 1; 2789 } 2790 break; 2791 case MTBSS: 2792 cmd[0] = SPACE; 2793 cmd[1] = 0x04; /* Space Setmarks */ 2794 ltmp = (-arg); 2795 cmd[2] = (ltmp >> 16); 2796 cmd[3] = (ltmp >> 8); 2797 cmd[4] = ltmp; 2798 deb_space_print(STp, ST_DEB_BACKWARD, "setmarks", cmd); 2799 if (arg != 0) { 2800 blkno = fileno = (-1); 2801 at_sm = 1; 2802 } 2803 break; 2804 case MTWEOF: 2805 case MTWEOFI: 2806 case MTWSM: 2807 if (STp->write_prot) 2808 return (-EACCES); 2809 cmd[0] = WRITE_FILEMARKS; 2810 if (cmd_in == MTWSM) 2811 cmd[1] = 2; 2812 if (cmd_in == MTWEOFI || 2813 (cmd_in == MTWEOF && STp->immediate_filemark)) 2814 cmd[1] |= 1; 2815 cmd[2] = (arg >> 16); 2816 cmd[3] = (arg >> 8); 2817 cmd[4] = arg; 2818 timeout = STp->device->request_queue->rq_timeout; 2819 DEBC( 2820 if (cmd_in != MTWSM) 2821 st_printk(ST_DEB_MSG, STp, 2822 "Writing %d filemarks.\n", 2823 cmd[2] * 65536 + 2824 cmd[3] * 256 + 2825 cmd[4]); 2826 else 2827 st_printk(ST_DEB_MSG, STp, 2828 "Writing %d setmarks.\n", 2829 cmd[2] * 65536 + 2830 cmd[3] * 256 + 2831 cmd[4]); 2832 ) 2833 if (fileno >= 0) 2834 fileno += arg; 2835 blkno = 0; 2836 at_sm = (cmd_in == MTWSM); 2837 break; 2838 case MTREW: 2839 cmd[0] = REZERO_UNIT; 2840 if (STp->immediate) { 2841 cmd[1] = 1; /* Don't wait for completion */ 2842 timeout = STp->device->request_queue->rq_timeout; 2843 } 2844 DEBC_printk(STp, "Rewinding tape.\n"); 2845 fileno = blkno = at_sm = 0; 2846 break; 2847 case MTNOP: 2848 DEBC_printk(STp, "No op on tape.\n"); 2849 return 0; /* Should do something ? */ 2850 break; 2851 case MTRETEN: 2852 cmd[0] = START_STOP; 2853 if (STp->immediate) { 2854 cmd[1] = 1; /* Don't wait for completion */ 2855 timeout = STp->device->request_queue->rq_timeout; 2856 } 2857 cmd[4] = 3; 2858 DEBC_printk(STp, "Retensioning tape.\n"); 2859 fileno = blkno = at_sm = 0; 2860 break; 2861 case MTEOM: 2862 if (!STp->fast_mteom) { 2863 /* space to the end of tape */ 2864 ioctl_result = st_int_ioctl(STp, MTFSF, 0x7fffff); 2865 fileno = STps->drv_file; 2866 if (STps->eof >= ST_EOD_1) 2867 return 0; 2868 /* The next lines would hide the number of spaced FileMarks 2869 That's why I inserted the previous lines. I had no luck 2870 with detecting EOM with FSF, so we go now to EOM. 2871 Joerg Weule */ 2872 } else 2873 fileno = (-1); 2874 cmd[0] = SPACE; 2875 cmd[1] = 3; 2876 DEBC_printk(STp, "Spacing to end of recorded medium.\n"); 2877 blkno = -1; 2878 at_sm = 0; 2879 break; 2880 case MTERASE: 2881 if (STp->write_prot) 2882 return (-EACCES); 2883 cmd[0] = ERASE; 2884 cmd[1] = (arg ? 1 : 0); /* Long erase with non-zero argument */ 2885 if (STp->immediate) { 2886 cmd[1] |= 2; /* Don't wait for completion */ 2887 timeout = STp->device->request_queue->rq_timeout; 2888 } 2889 else 2890 timeout = STp->long_timeout * 8; 2891 2892 DEBC_printk(STp, "Erasing tape.\n"); 2893 fileno = blkno = at_sm = 0; 2894 break; 2895 case MTSETBLK: /* Set block length */ 2896 case MTSETDENSITY: /* Set tape density */ 2897 case MTSETDRVBUFFER: /* Set drive buffering */ 2898 case SET_DENS_AND_BLK: /* Set density and block size */ 2899 chg_eof = 0; 2900 if (STp->dirty || (STp->buffer)->buffer_bytes != 0) 2901 return (-EIO); /* Not allowed if data in buffer */ 2902 if ((cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) && 2903 (arg & MT_ST_BLKSIZE_MASK) != 0 && 2904 STp->max_block > 0 && 2905 ((arg & MT_ST_BLKSIZE_MASK) < STp->min_block || 2906 (arg & MT_ST_BLKSIZE_MASK) > STp->max_block)) { 2907 st_printk(KERN_WARNING, STp, "Illegal block size.\n"); 2908 return (-EINVAL); 2909 } 2910 cmd[0] = MODE_SELECT; 2911 if ((STp->use_pf & USE_PF)) 2912 cmd[1] = MODE_SELECT_PAGE_FORMAT; 2913 cmd[4] = datalen = 12; 2914 direction = DMA_TO_DEVICE; 2915 2916 memset((STp->buffer)->b_data, 0, 12); 2917 if (cmd_in == MTSETDRVBUFFER) 2918 (STp->buffer)->b_data[2] = (arg & 7) << 4; 2919 else 2920 (STp->buffer)->b_data[2] = 2921 STp->drv_buffer << 4; 2922 (STp->buffer)->b_data[3] = 8; /* block descriptor length */ 2923 if (cmd_in == MTSETDENSITY) { 2924 (STp->buffer)->b_data[4] = arg; 2925 STp->density_changed = 1; /* At least we tried ;-) */ 2926 } else if (cmd_in == SET_DENS_AND_BLK) 2927 (STp->buffer)->b_data[4] = arg >> 24; 2928 else 2929 (STp->buffer)->b_data[4] = STp->density; 2930 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2931 ltmp = arg & MT_ST_BLKSIZE_MASK; 2932 if (cmd_in == MTSETBLK) 2933 STp->blksize_changed = 1; /* At least we tried ;-) */ 2934 } else 2935 ltmp = STp->block_size; 2936 (STp->buffer)->b_data[9] = (ltmp >> 16); 2937 (STp->buffer)->b_data[10] = (ltmp >> 8); 2938 (STp->buffer)->b_data[11] = ltmp; 2939 timeout = STp->device->request_queue->rq_timeout; 2940 DEBC( 2941 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) 2942 st_printk(ST_DEB_MSG, STp, 2943 "Setting block size to %d bytes.\n", 2944 (STp->buffer)->b_data[9] * 65536 + 2945 (STp->buffer)->b_data[10] * 256 + 2946 (STp->buffer)->b_data[11]); 2947 if (cmd_in == MTSETDENSITY || cmd_in == SET_DENS_AND_BLK) 2948 st_printk(ST_DEB_MSG, STp, 2949 "Setting density code to %x.\n", 2950 (STp->buffer)->b_data[4]); 2951 if (cmd_in == MTSETDRVBUFFER) 2952 st_printk(ST_DEB_MSG, STp, 2953 "Setting drive buffer code to %d.\n", 2954 ((STp->buffer)->b_data[2] >> 4) & 7); 2955 ) 2956 break; 2957 default: 2958 return (-ENOSYS); 2959 } 2960 2961 SRpnt = st_do_scsi(NULL, STp, cmd, datalen, direction, 2962 timeout, MAX_RETRIES, 1); 2963 if (!SRpnt) 2964 return (STp->buffer)->syscall_result; 2965 2966 ioctl_result = (STp->buffer)->syscall_result; 2967 2968 if (!ioctl_result) { /* SCSI command successful */ 2969 st_release_request(SRpnt); 2970 SRpnt = NULL; 2971 STps->drv_block = blkno; 2972 STps->drv_file = fileno; 2973 STps->at_sm = at_sm; 2974 2975 if (cmd_in == MTBSFM) 2976 ioctl_result = st_int_ioctl(STp, MTFSF, 1); 2977 else if (cmd_in == MTFSFM) 2978 ioctl_result = st_int_ioctl(STp, MTBSF, 1); 2979 2980 if (cmd_in == MTSETBLK || cmd_in == SET_DENS_AND_BLK) { 2981 STp->block_size = arg & MT_ST_BLKSIZE_MASK; 2982 if (STp->block_size != 0) { 2983 (STp->buffer)->buffer_blocks = 2984 (STp->buffer)->buffer_size / STp->block_size; 2985 } 2986 (STp->buffer)->buffer_bytes = (STp->buffer)->read_pointer = 0; 2987 if (cmd_in == SET_DENS_AND_BLK) 2988 STp->density = arg >> MT_ST_DENSITY_SHIFT; 2989 } else if (cmd_in == MTSETDRVBUFFER) 2990 STp->drv_buffer = (arg & 7); 2991 else if (cmd_in == MTSETDENSITY) 2992 STp->density = arg; 2993 2994 if (cmd_in == MTEOM) 2995 STps->eof = ST_EOD; 2996 else if (cmd_in == MTFSF) 2997 STps->eof = ST_FM; 2998 else if (chg_eof) 2999 STps->eof = ST_NOEOF; 3000 3001 if (cmd_in == MTWEOF || cmd_in == MTWEOFI) 3002 STps->rw = ST_IDLE; /* prevent automatic WEOF at close */ 3003 } else { /* SCSI command was not completely successful. Don't return 3004 from this block without releasing the SCSI command block! */ 3005 struct st_cmdstatus *cmdstatp = &STp->buffer->cmdstat; 3006 3007 if (cmdstatp->flags & SENSE_EOM) { 3008 if (cmd_in != MTBSF && cmd_in != MTBSFM && 3009 cmd_in != MTBSR && cmd_in != MTBSS) 3010 STps->eof = ST_EOM_OK; 3011 STps->drv_block = 0; 3012 } 3013 3014 if (cmdstatp->remainder_valid) 3015 undone = (int)cmdstatp->uremainder64; 3016 else 3017 undone = 0; 3018 3019 if ((cmd_in == MTWEOF || cmd_in == MTWEOFI) && 3020 cmdstatp->have_sense && 3021 (cmdstatp->flags & SENSE_EOM)) { 3022 if (cmdstatp->sense_hdr.sense_key == NO_SENSE || 3023 cmdstatp->sense_hdr.sense_key == RECOVERED_ERROR) { 3024 ioctl_result = 0; /* EOF(s) written successfully at EOM */ 3025 STps->eof = ST_NOEOF; 3026 } else { /* Writing EOF(s) failed */ 3027 if (fileno >= 0) 3028 fileno -= undone; 3029 if (undone < arg) 3030 STps->eof = ST_NOEOF; 3031 } 3032 STps->drv_file = fileno; 3033 } else if ((cmd_in == MTFSF) || (cmd_in == MTFSFM)) { 3034 if (fileno >= 0) 3035 STps->drv_file = fileno - undone; 3036 else 3037 STps->drv_file = fileno; 3038 STps->drv_block = -1; 3039 STps->eof = ST_NOEOF; 3040 } else if ((cmd_in == MTBSF) || (cmd_in == MTBSFM)) { 3041 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3042 undone = (-undone); 3043 if (STps->drv_file >= 0) 3044 STps->drv_file = fileno + undone; 3045 STps->drv_block = 0; 3046 STps->eof = ST_NOEOF; 3047 } else if (cmd_in == MTFSR) { 3048 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3049 if (STps->drv_file >= 0) 3050 STps->drv_file++; 3051 STps->drv_block = 0; 3052 STps->eof = ST_FM; 3053 } else { 3054 if (blkno >= undone) 3055 STps->drv_block = blkno - undone; 3056 else 3057 STps->drv_block = (-1); 3058 STps->eof = ST_NOEOF; 3059 } 3060 } else if (cmd_in == MTBSR) { 3061 if (cmdstatp->flags & SENSE_FMK) { /* Hit filemark */ 3062 STps->drv_file--; 3063 STps->drv_block = (-1); 3064 } else { 3065 if (arg > 0 && undone < 0) /* Some drives get this wrong */ 3066 undone = (-undone); 3067 if (STps->drv_block >= 0) 3068 STps->drv_block = blkno + undone; 3069 } 3070 STps->eof = ST_NOEOF; 3071 } else if (cmd_in == MTEOM) { 3072 STps->drv_file = (-1); 3073 STps->drv_block = (-1); 3074 STps->eof = ST_EOD; 3075 } else if (cmd_in == MTSETBLK || 3076 cmd_in == MTSETDENSITY || 3077 cmd_in == MTSETDRVBUFFER || 3078 cmd_in == SET_DENS_AND_BLK) { 3079 if (cmdstatp->sense_hdr.sense_key == ILLEGAL_REQUEST && 3080 !(STp->use_pf & PF_TESTED)) { 3081 /* Try the other possible state of Page Format if not 3082 already tried */ 3083 STp->use_pf = (STp->use_pf ^ USE_PF) | PF_TESTED; 3084 st_release_request(SRpnt); 3085 SRpnt = NULL; 3086 return st_int_ioctl(STp, cmd_in, arg); 3087 } 3088 } else if (chg_eof) 3089 STps->eof = ST_NOEOF; 3090 3091 if (cmdstatp->sense_hdr.sense_key == BLANK_CHECK) 3092 STps->eof = ST_EOD; 3093 3094 st_release_request(SRpnt); 3095 SRpnt = NULL; 3096 } 3097 3098 return ioctl_result; 3099 } 3100 3101 3102 /* Get the tape position. If bt == 2, arg points into a kernel space mt_loc 3103 structure. */ 3104 3105 static int get_location(struct scsi_tape *STp, unsigned int *block, int *partition, 3106 int logical) 3107 { 3108 int result; 3109 unsigned char scmd[MAX_COMMAND_SIZE]; 3110 struct st_request *SRpnt; 3111 3112 if (STp->ready != ST_READY) 3113 return (-EIO); 3114 3115 memset(scmd, 0, MAX_COMMAND_SIZE); 3116 if ((STp->device)->scsi_level < SCSI_2) { 3117 scmd[0] = QFA_REQUEST_BLOCK; 3118 scmd[4] = 3; 3119 } else { 3120 scmd[0] = READ_POSITION; 3121 if (!logical && !STp->scsi2_logical) 3122 scmd[1] = 1; 3123 } 3124 SRpnt = st_do_scsi(NULL, STp, scmd, 20, DMA_FROM_DEVICE, 3125 STp->device->request_queue->rq_timeout, 3126 MAX_READY_RETRIES, 1); 3127 if (!SRpnt) 3128 return (STp->buffer)->syscall_result; 3129 3130 if ((STp->buffer)->syscall_result != 0 || 3131 (STp->device->scsi_level >= SCSI_2 && 3132 ((STp->buffer)->b_data[0] & 4) != 0)) { 3133 *block = *partition = 0; 3134 DEBC_printk(STp, " Can't read tape position.\n"); 3135 result = (-EIO); 3136 } else { 3137 result = 0; 3138 if ((STp->device)->scsi_level < SCSI_2) { 3139 *block = ((STp->buffer)->b_data[0] << 16) 3140 + ((STp->buffer)->b_data[1] << 8) 3141 + (STp->buffer)->b_data[2]; 3142 *partition = 0; 3143 } else { 3144 *block = ((STp->buffer)->b_data[4] << 24) 3145 + ((STp->buffer)->b_data[5] << 16) 3146 + ((STp->buffer)->b_data[6] << 8) 3147 + (STp->buffer)->b_data[7]; 3148 *partition = (STp->buffer)->b_data[1]; 3149 if (((STp->buffer)->b_data[0] & 0x80) && 3150 (STp->buffer)->b_data[1] == 0) /* BOP of partition 0 */ 3151 STp->ps[0].drv_block = STp->ps[0].drv_file = 0; 3152 } 3153 DEBC_printk(STp, "Got tape pos. blk %d part %d.\n", 3154 *block, *partition); 3155 } 3156 st_release_request(SRpnt); 3157 SRpnt = NULL; 3158 3159 return result; 3160 } 3161 3162 3163 /* Set the tape block and partition. Negative partition means that only the 3164 block should be set in vendor specific way. */ 3165 static int set_location(struct scsi_tape *STp, unsigned int block, int partition, 3166 int logical) 3167 { 3168 struct st_partstat *STps; 3169 int result, p; 3170 unsigned int blk; 3171 int timeout; 3172 unsigned char scmd[MAX_COMMAND_SIZE]; 3173 struct st_request *SRpnt; 3174 3175 if (STp->ready != ST_READY) 3176 return (-EIO); 3177 timeout = STp->long_timeout; 3178 STps = &(STp->ps[STp->partition]); 3179 3180 DEBC_printk(STp, "Setting block to %d and partition to %d.\n", 3181 block, partition); 3182 DEB(if (partition < 0) 3183 return (-EIO); ) 3184 3185 /* Update the location at the partition we are leaving */ 3186 if ((!STp->can_partitions && partition != 0) || 3187 partition >= ST_NBR_PARTITIONS) 3188 return (-EINVAL); 3189 if (partition != STp->partition) { 3190 if (get_location(STp, &blk, &p, 1)) 3191 STps->last_block_valid = 0; 3192 else { 3193 STps->last_block_valid = 1; 3194 STps->last_block_visited = blk; 3195 DEBC_printk(STp, "Visited block %d for " 3196 "partition %d saved.\n", 3197 blk, STp->partition); 3198 } 3199 } 3200 3201 memset(scmd, 0, MAX_COMMAND_SIZE); 3202 if ((STp->device)->scsi_level < SCSI_2) { 3203 scmd[0] = QFA_SEEK_BLOCK; 3204 scmd[2] = (block >> 16); 3205 scmd[3] = (block >> 8); 3206 scmd[4] = block; 3207 scmd[5] = 0; 3208 } else { 3209 scmd[0] = SEEK_10; 3210 scmd[3] = (block >> 24); 3211 scmd[4] = (block >> 16); 3212 scmd[5] = (block >> 8); 3213 scmd[6] = block; 3214 if (!logical && !STp->scsi2_logical) 3215 scmd[1] = 4; 3216 if (STp->partition != partition) { 3217 scmd[1] |= 2; 3218 scmd[8] = partition; 3219 DEBC_printk(STp, "Trying to change partition " 3220 "from %d to %d\n", STp->partition, 3221 partition); 3222 } 3223 } 3224 if (STp->immediate) { 3225 scmd[1] |= 1; /* Don't wait for completion */ 3226 timeout = STp->device->request_queue->rq_timeout; 3227 } 3228 3229 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3230 timeout, MAX_READY_RETRIES, 1); 3231 if (!SRpnt) 3232 return (STp->buffer)->syscall_result; 3233 3234 STps->drv_block = STps->drv_file = (-1); 3235 STps->eof = ST_NOEOF; 3236 if ((STp->buffer)->syscall_result != 0) { 3237 result = (-EIO); 3238 if (STp->can_partitions && 3239 (STp->device)->scsi_level >= SCSI_2 && 3240 (p = find_partition(STp)) >= 0) 3241 STp->partition = p; 3242 } else { 3243 if (STp->can_partitions) { 3244 STp->partition = partition; 3245 STps = &(STp->ps[partition]); 3246 if (!STps->last_block_valid || 3247 STps->last_block_visited != block) { 3248 STps->at_sm = 0; 3249 STps->rw = ST_IDLE; 3250 } 3251 } else 3252 STps->at_sm = 0; 3253 if (block == 0) 3254 STps->drv_block = STps->drv_file = 0; 3255 result = 0; 3256 } 3257 3258 st_release_request(SRpnt); 3259 SRpnt = NULL; 3260 3261 return result; 3262 } 3263 3264 3265 /* Find the current partition number for the drive status. Called from open and 3266 returns either partition number of negative error code. */ 3267 static int find_partition(struct scsi_tape *STp) 3268 { 3269 int i, partition; 3270 unsigned int block; 3271 3272 if ((i = get_location(STp, &block, &partition, 1)) < 0) 3273 return i; 3274 if (partition >= ST_NBR_PARTITIONS) 3275 return (-EIO); 3276 return partition; 3277 } 3278 3279 3280 /* Change the partition if necessary */ 3281 static int switch_partition(struct scsi_tape *STp) 3282 { 3283 struct st_partstat *STps; 3284 3285 if (STp->partition == STp->new_partition) 3286 return 0; 3287 STps = &(STp->ps[STp->new_partition]); 3288 if (!STps->last_block_valid) 3289 STps->last_block_visited = 0; 3290 return set_location(STp, STps->last_block_visited, STp->new_partition, 1); 3291 } 3292 3293 /* Functions for reading and writing the medium partition mode page. */ 3294 3295 #define PART_PAGE 0x11 3296 #define PART_PAGE_FIXED_LENGTH 8 3297 3298 #define PP_OFF_MAX_ADD_PARTS 2 3299 #define PP_OFF_NBR_ADD_PARTS 3 3300 #define PP_OFF_FLAGS 4 3301 #define PP_OFF_PART_UNITS 6 3302 #define PP_OFF_RESERVED 7 3303 3304 #define PP_BIT_IDP 0x20 3305 #define PP_BIT_FDP 0x80 3306 #define PP_MSK_PSUM_MB 0x10 3307 #define PP_MSK_PSUM_UNITS 0x18 3308 #define PP_MSK_POFM 0x04 3309 3310 /* Get the number of partitions on the tape. As a side effect reads the 3311 mode page into the tape buffer. */ 3312 static int nbr_partitions(struct scsi_tape *STp) 3313 { 3314 int result; 3315 3316 if (STp->ready != ST_READY) 3317 return (-EIO); 3318 3319 result = read_mode_page(STp, PART_PAGE, 1); 3320 3321 if (result) { 3322 DEBC_printk(STp, "Can't read medium partition page.\n"); 3323 result = (-EIO); 3324 } else { 3325 result = (STp->buffer)->b_data[MODE_HEADER_LENGTH + 3326 PP_OFF_NBR_ADD_PARTS] + 1; 3327 DEBC_printk(STp, "Number of partitions %d.\n", result); 3328 } 3329 3330 return result; 3331 } 3332 3333 3334 static int format_medium(struct scsi_tape *STp, int format) 3335 { 3336 int result = 0; 3337 int timeout = STp->long_timeout; 3338 unsigned char scmd[MAX_COMMAND_SIZE]; 3339 struct st_request *SRpnt; 3340 3341 memset(scmd, 0, MAX_COMMAND_SIZE); 3342 scmd[0] = FORMAT_UNIT; 3343 scmd[2] = format; 3344 if (STp->immediate) { 3345 scmd[1] |= 1; /* Don't wait for completion */ 3346 timeout = STp->device->request_queue->rq_timeout; 3347 } 3348 DEBC_printk(STp, "Sending FORMAT MEDIUM\n"); 3349 SRpnt = st_do_scsi(NULL, STp, scmd, 0, DMA_NONE, 3350 timeout, MAX_RETRIES, 1); 3351 if (!SRpnt) 3352 result = STp->buffer->syscall_result; 3353 return result; 3354 } 3355 3356 3357 /* Partition the tape into two partitions if size > 0 or one partition if 3358 size == 0. 3359 3360 The block descriptors are read and written because Sony SDT-7000 does not 3361 work without this (suggestion from Michael Schaefer <Michael.Schaefer@dlr.de>). 3362 3363 My HP C1533A drive returns only one partition size field. This is used to 3364 set the size of partition 1. There is no size field for the default partition. 3365 Michael Schaefer's Sony SDT-7000 returns two descriptors and the second is 3366 used to set the size of partition 1 (this is what the SCSI-3 standard specifies). 3367 The following algorithm is used to accommodate both drives: if the number of 3368 partition size fields is greater than the maximum number of additional partitions 3369 in the mode page, the second field is used. Otherwise the first field is used. 3370 3371 For Seagate DDS drives the page length must be 8 when no partitions is defined 3372 and 10 when 1 partition is defined (information from Eric Lee Green). This is 3373 is acceptable also to some other old drives and enforced if the first partition 3374 size field is used for the first additional partition size. 3375 3376 For drives that advertize SCSI-3 or newer, use the SSC-3 methods. 3377 */ 3378 static int partition_tape(struct scsi_tape *STp, int size) 3379 { 3380 int result; 3381 int target_partition; 3382 bool scsi3 = STp->device->scsi_level >= SCSI_3, needs_format = false; 3383 int pgo, psd_cnt, psdo; 3384 int psum = PP_MSK_PSUM_MB, units = 0; 3385 unsigned char *bp; 3386 3387 result = read_mode_page(STp, PART_PAGE, 0); 3388 if (result) { 3389 DEBC_printk(STp, "Can't read partition mode page.\n"); 3390 return result; 3391 } 3392 target_partition = 1; 3393 if (size < 0) { 3394 target_partition = 0; 3395 size = -size; 3396 } 3397 3398 /* The mode page is in the buffer. Let's modify it and write it. */ 3399 bp = (STp->buffer)->b_data; 3400 pgo = MODE_HEADER_LENGTH + bp[MH_OFF_BDESCS_LENGTH]; 3401 DEBC_printk(STp, "Partition page length is %d bytes.\n", 3402 bp[pgo + MP_OFF_PAGE_LENGTH] + 2); 3403 3404 psd_cnt = (bp[pgo + MP_OFF_PAGE_LENGTH] + 2 - PART_PAGE_FIXED_LENGTH) / 2; 3405 3406 if (scsi3) { 3407 needs_format = (bp[pgo + PP_OFF_FLAGS] & PP_MSK_POFM) != 0; 3408 if (needs_format && size == 0) { 3409 /* No need to write the mode page when clearing 3410 * partitioning 3411 */ 3412 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3413 result = format_medium(STp, 0); 3414 goto out; 3415 } 3416 if (needs_format) /* Leave the old value for HP DATs claiming SCSI_3 */ 3417 psd_cnt = 2; 3418 if ((bp[pgo + PP_OFF_FLAGS] & PP_MSK_PSUM_UNITS) == PP_MSK_PSUM_UNITS) { 3419 /* Use units scaling for large partitions if the device 3420 * suggests it and no precision lost. Required for IBM 3421 * TS1140/50 drives that don't support MB units. 3422 */ 3423 if (size >= 1000 && (size % 1000) == 0) { 3424 size /= 1000; 3425 psum = PP_MSK_PSUM_UNITS; 3426 units = 9; /* GB */ 3427 } 3428 } 3429 /* Try it anyway if too large to specify in MB */ 3430 if (psum == PP_MSK_PSUM_MB && size >= 65534) { 3431 size /= 1000; 3432 psum = PP_MSK_PSUM_UNITS; 3433 units = 9; /* GB */ 3434 } 3435 } 3436 3437 if (size >= 65535 || /* Does not fit into two bytes */ 3438 (target_partition == 0 && psd_cnt < 2)) { 3439 result = -EINVAL; 3440 goto out; 3441 } 3442 3443 psdo = pgo + PART_PAGE_FIXED_LENGTH; 3444 /* The second condition is for HP DDS which use only one partition size 3445 * descriptor 3446 */ 3447 if (target_partition > 0 && 3448 (psd_cnt > bp[pgo + PP_OFF_MAX_ADD_PARTS] || 3449 bp[pgo + PP_OFF_MAX_ADD_PARTS] != 1)) { 3450 bp[psdo] = bp[psdo + 1] = 0xff; /* Rest to partition 0 */ 3451 psdo += 2; 3452 } 3453 memset(bp + psdo, 0, bp[pgo + PP_OFF_NBR_ADD_PARTS] * 2); 3454 3455 DEBC_printk(STp, "psd_cnt %d, max.parts %d, nbr_parts %d\n", 3456 psd_cnt, bp[pgo + PP_OFF_MAX_ADD_PARTS], 3457 bp[pgo + PP_OFF_NBR_ADD_PARTS]); 3458 3459 if (size == 0) { 3460 bp[pgo + PP_OFF_NBR_ADD_PARTS] = 0; 3461 if (psd_cnt <= bp[pgo + PP_OFF_MAX_ADD_PARTS]) 3462 bp[pgo + MP_OFF_PAGE_LENGTH] = 6; 3463 DEBC_printk(STp, "Formatting tape with one partition.\n"); 3464 } else { 3465 bp[psdo] = (size >> 8) & 0xff; 3466 bp[psdo + 1] = size & 0xff; 3467 if (target_partition == 0) 3468 bp[psdo + 2] = bp[psdo + 3] = 0xff; 3469 bp[pgo + 3] = 1; 3470 if (bp[pgo + MP_OFF_PAGE_LENGTH] < 8) 3471 bp[pgo + MP_OFF_PAGE_LENGTH] = 8; 3472 DEBC_printk(STp, 3473 "Formatting tape with two partitions (%i = %d MB).\n", 3474 target_partition, units > 0 ? size * 1000 : size); 3475 } 3476 bp[pgo + PP_OFF_PART_UNITS] = 0; 3477 bp[pgo + PP_OFF_RESERVED] = 0; 3478 if (size != 1 || units != 0) { 3479 bp[pgo + PP_OFF_FLAGS] = PP_BIT_IDP | psum | 3480 (bp[pgo + PP_OFF_FLAGS] & 0x07); 3481 bp[pgo + PP_OFF_PART_UNITS] = units; 3482 } else 3483 bp[pgo + PP_OFF_FLAGS] = PP_BIT_FDP | 3484 (bp[pgo + PP_OFF_FLAGS] & 0x1f); 3485 bp[pgo + MP_OFF_PAGE_LENGTH] = 6 + psd_cnt * 2; 3486 3487 result = write_mode_page(STp, PART_PAGE, 1); 3488 3489 if (!result && needs_format) 3490 result = format_medium(STp, 1); 3491 3492 if (result) { 3493 st_printk(KERN_INFO, STp, "Partitioning of tape failed.\n"); 3494 result = (-EIO); 3495 } 3496 3497 out: 3498 return result; 3499 } 3500 3501 3502 3503 /* The ioctl command */ 3504 static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p) 3505 { 3506 int i, cmd_nr, cmd_type, bt; 3507 int retval = 0; 3508 unsigned int blk; 3509 struct scsi_tape *STp = file->private_data; 3510 struct st_modedef *STm; 3511 struct st_partstat *STps; 3512 3513 if (mutex_lock_interruptible(&STp->lock)) 3514 return -ERESTARTSYS; 3515 3516 DEB( 3517 if (debugging && !STp->in_use) { 3518 st_printk(ST_DEB_MSG, STp, "Incorrect device.\n"); 3519 retval = (-EIO); 3520 goto out; 3521 } ) /* end DEB */ 3522 3523 STm = &(STp->modes[STp->current_mode]); 3524 STps = &(STp->ps[STp->partition]); 3525 3526 /* 3527 * If we are in the middle of error recovery, don't let anyone 3528 * else try and use this device. Also, if error recovery fails, it 3529 * may try and take the device offline, in which case all further 3530 * access to the device is prohibited. 3531 */ 3532 retval = scsi_ioctl_block_when_processing_errors(STp->device, cmd_in, 3533 file->f_flags & O_NDELAY); 3534 if (retval) 3535 goto out; 3536 3537 cmd_type = _IOC_TYPE(cmd_in); 3538 cmd_nr = _IOC_NR(cmd_in); 3539 3540 if (cmd_type == _IOC_TYPE(MTIOCTOP) && cmd_nr == _IOC_NR(MTIOCTOP)) { 3541 struct mtop mtc; 3542 3543 if (_IOC_SIZE(cmd_in) != sizeof(mtc)) { 3544 retval = (-EINVAL); 3545 goto out; 3546 } 3547 3548 i = copy_from_user(&mtc, p, sizeof(struct mtop)); 3549 if (i) { 3550 retval = (-EFAULT); 3551 goto out; 3552 } 3553 3554 if (mtc.mt_op == MTSETDRVBUFFER && !capable(CAP_SYS_ADMIN)) { 3555 st_printk(KERN_WARNING, STp, 3556 "MTSETDRVBUFFER only allowed for root.\n"); 3557 retval = (-EPERM); 3558 goto out; 3559 } 3560 if (!STm->defined && 3561 (mtc.mt_op != MTSETDRVBUFFER && 3562 (mtc.mt_count & MT_ST_OPTIONS) == 0)) { 3563 retval = (-ENXIO); 3564 goto out; 3565 } 3566 3567 if (!STp->pos_unknown) { 3568 3569 if (STps->eof == ST_FM_HIT) { 3570 if (mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3571 mtc.mt_op == MTEOM) { 3572 mtc.mt_count -= 1; 3573 if (STps->drv_file >= 0) 3574 STps->drv_file += 1; 3575 } else if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) { 3576 mtc.mt_count += 1; 3577 if (STps->drv_file >= 0) 3578 STps->drv_file += 1; 3579 } 3580 } 3581 3582 if (mtc.mt_op == MTSEEK) { 3583 /* Old position must be restored if partition will be 3584 changed */ 3585 i = !STp->can_partitions || 3586 (STp->new_partition != STp->partition); 3587 } else { 3588 i = mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3589 mtc.mt_op == MTRETEN || mtc.mt_op == MTEOM || 3590 mtc.mt_op == MTLOCK || mtc.mt_op == MTLOAD || 3591 mtc.mt_op == MTFSF || mtc.mt_op == MTFSFM || 3592 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM || 3593 mtc.mt_op == MTCOMPRESSION; 3594 } 3595 i = flush_buffer(STp, i); 3596 if (i < 0) { 3597 retval = i; 3598 goto out; 3599 } 3600 if (STps->rw == ST_WRITING && 3601 (mtc.mt_op == MTREW || mtc.mt_op == MTOFFL || 3602 mtc.mt_op == MTSEEK || 3603 mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM)) { 3604 i = st_int_ioctl(STp, MTWEOF, 1); 3605 if (i < 0) { 3606 retval = i; 3607 goto out; 3608 } 3609 if (mtc.mt_op == MTBSF || mtc.mt_op == MTBSFM) 3610 mtc.mt_count++; 3611 STps->rw = ST_IDLE; 3612 } 3613 3614 } else { 3615 /* 3616 * If there was a bus reset, block further access 3617 * to this device. If the user wants to rewind the tape, 3618 * then reset the flag and allow access again. 3619 */ 3620 if (mtc.mt_op != MTREW && 3621 mtc.mt_op != MTOFFL && 3622 mtc.mt_op != MTRETEN && 3623 mtc.mt_op != MTERASE && 3624 mtc.mt_op != MTSEEK && 3625 mtc.mt_op != MTEOM) { 3626 retval = (-EIO); 3627 goto out; 3628 } 3629 reset_state(STp); 3630 /* remove this when the midlevel properly clears was_reset */ 3631 STp->device->was_reset = 0; 3632 } 3633 3634 if (mtc.mt_op != MTNOP && mtc.mt_op != MTSETBLK && 3635 mtc.mt_op != MTSETDENSITY && mtc.mt_op != MTWSM && 3636 mtc.mt_op != MTSETDRVBUFFER && mtc.mt_op != MTSETPART) 3637 STps->rw = ST_IDLE; /* Prevent automatic WEOF and fsf */ 3638 3639 if (mtc.mt_op == MTOFFL && STp->door_locked != ST_UNLOCKED) 3640 do_door_lock(STp, 0); /* Ignore result! */ 3641 3642 if (mtc.mt_op == MTSETDRVBUFFER && 3643 (mtc.mt_count & MT_ST_OPTIONS) != 0) { 3644 retval = st_set_options(STp, mtc.mt_count); 3645 goto out; 3646 } 3647 3648 if (mtc.mt_op == MTSETPART) { 3649 if (!STp->can_partitions || 3650 mtc.mt_count < 0 || mtc.mt_count >= ST_NBR_PARTITIONS) { 3651 retval = (-EINVAL); 3652 goto out; 3653 } 3654 if (mtc.mt_count >= STp->nbr_partitions && 3655 (STp->nbr_partitions = nbr_partitions(STp)) < 0) { 3656 retval = (-EIO); 3657 goto out; 3658 } 3659 if (mtc.mt_count >= STp->nbr_partitions) { 3660 retval = (-EINVAL); 3661 goto out; 3662 } 3663 STp->new_partition = mtc.mt_count; 3664 retval = 0; 3665 goto out; 3666 } 3667 3668 if (mtc.mt_op == MTMKPART) { 3669 if (!STp->can_partitions) { 3670 retval = (-EINVAL); 3671 goto out; 3672 } 3673 i = do_load_unload(STp, file, 1); 3674 if (i < 0) { 3675 retval = i; 3676 goto out; 3677 } 3678 i = partition_tape(STp, mtc.mt_count); 3679 if (i < 0) { 3680 retval = i; 3681 goto out; 3682 } 3683 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 3684 STp->ps[i].rw = ST_IDLE; 3685 STp->ps[i].at_sm = 0; 3686 STp->ps[i].last_block_valid = 0; 3687 } 3688 STp->partition = STp->new_partition = 0; 3689 STp->nbr_partitions = mtc.mt_count != 0 ? 2 : 1; 3690 STps->drv_block = STps->drv_file = 0; 3691 retval = 0; 3692 goto out; 3693 } 3694 3695 if (mtc.mt_op == MTSEEK) { 3696 i = set_location(STp, mtc.mt_count, STp->new_partition, 0); 3697 if (!STp->can_partitions) 3698 STp->ps[0].rw = ST_IDLE; 3699 retval = i; 3700 goto out; 3701 } 3702 3703 if (mtc.mt_op == MTUNLOAD || mtc.mt_op == MTOFFL) { 3704 retval = do_load_unload(STp, file, 0); 3705 goto out; 3706 } 3707 3708 if (mtc.mt_op == MTLOAD) { 3709 retval = do_load_unload(STp, file, max(1, mtc.mt_count)); 3710 goto out; 3711 } 3712 3713 if (mtc.mt_op == MTLOCK || mtc.mt_op == MTUNLOCK) { 3714 retval = do_door_lock(STp, (mtc.mt_op == MTLOCK)); 3715 goto out; 3716 } 3717 3718 if (STp->can_partitions && STp->ready == ST_READY && 3719 (i = switch_partition(STp)) < 0) { 3720 retval = i; 3721 goto out; 3722 } 3723 3724 if (mtc.mt_op == MTCOMPRESSION) 3725 retval = st_compression(STp, (mtc.mt_count & 1)); 3726 else 3727 retval = st_int_ioctl(STp, mtc.mt_op, mtc.mt_count); 3728 goto out; 3729 } 3730 if (!STm->defined) { 3731 retval = (-ENXIO); 3732 goto out; 3733 } 3734 3735 if ((i = flush_buffer(STp, 0)) < 0) { 3736 retval = i; 3737 goto out; 3738 } 3739 if (STp->can_partitions && 3740 (i = switch_partition(STp)) < 0) { 3741 retval = i; 3742 goto out; 3743 } 3744 3745 if (cmd_type == _IOC_TYPE(MTIOCGET) && cmd_nr == _IOC_NR(MTIOCGET)) { 3746 struct mtget mt_status; 3747 3748 if (_IOC_SIZE(cmd_in) != sizeof(struct mtget)) { 3749 retval = (-EINVAL); 3750 goto out; 3751 } 3752 3753 mt_status.mt_type = STp->tape_type; 3754 mt_status.mt_dsreg = 3755 ((STp->block_size << MT_ST_BLKSIZE_SHIFT) & MT_ST_BLKSIZE_MASK) | 3756 ((STp->density << MT_ST_DENSITY_SHIFT) & MT_ST_DENSITY_MASK); 3757 mt_status.mt_blkno = STps->drv_block; 3758 mt_status.mt_fileno = STps->drv_file; 3759 if (STp->block_size != 0) { 3760 if (STps->rw == ST_WRITING) 3761 mt_status.mt_blkno += 3762 (STp->buffer)->buffer_bytes / STp->block_size; 3763 else if (STps->rw == ST_READING) 3764 mt_status.mt_blkno -= 3765 ((STp->buffer)->buffer_bytes + 3766 STp->block_size - 1) / STp->block_size; 3767 } 3768 3769 mt_status.mt_gstat = 0; 3770 if (STp->drv_write_prot) 3771 mt_status.mt_gstat |= GMT_WR_PROT(0xffffffff); 3772 if (mt_status.mt_blkno == 0) { 3773 if (mt_status.mt_fileno == 0) 3774 mt_status.mt_gstat |= GMT_BOT(0xffffffff); 3775 else 3776 mt_status.mt_gstat |= GMT_EOF(0xffffffff); 3777 } 3778 mt_status.mt_erreg = (STp->recover_reg << MT_ST_SOFTERR_SHIFT); 3779 mt_status.mt_resid = STp->partition; 3780 if (STps->eof == ST_EOM_OK || STps->eof == ST_EOM_ERROR) 3781 mt_status.mt_gstat |= GMT_EOT(0xffffffff); 3782 else if (STps->eof >= ST_EOM_OK) 3783 mt_status.mt_gstat |= GMT_EOD(0xffffffff); 3784 if (STp->density == 1) 3785 mt_status.mt_gstat |= GMT_D_800(0xffffffff); 3786 else if (STp->density == 2) 3787 mt_status.mt_gstat |= GMT_D_1600(0xffffffff); 3788 else if (STp->density == 3) 3789 mt_status.mt_gstat |= GMT_D_6250(0xffffffff); 3790 if (STp->ready == ST_READY) 3791 mt_status.mt_gstat |= GMT_ONLINE(0xffffffff); 3792 if (STp->ready == ST_NO_TAPE) 3793 mt_status.mt_gstat |= GMT_DR_OPEN(0xffffffff); 3794 if (STps->at_sm) 3795 mt_status.mt_gstat |= GMT_SM(0xffffffff); 3796 if (STm->do_async_writes || 3797 (STm->do_buffer_writes && STp->block_size != 0) || 3798 STp->drv_buffer != 0) 3799 mt_status.mt_gstat |= GMT_IM_REP_EN(0xffffffff); 3800 if (STp->cleaning_req) 3801 mt_status.mt_gstat |= GMT_CLN(0xffffffff); 3802 3803 retval = put_user_mtget(p, &mt_status); 3804 if (retval) 3805 goto out; 3806 3807 STp->recover_reg = 0; /* Clear after read */ 3808 goto out; 3809 } /* End of MTIOCGET */ 3810 if (cmd_type == _IOC_TYPE(MTIOCPOS) && cmd_nr == _IOC_NR(MTIOCPOS)) { 3811 struct mtpos mt_pos; 3812 if (_IOC_SIZE(cmd_in) != sizeof(struct mtpos)) { 3813 retval = (-EINVAL); 3814 goto out; 3815 } 3816 if ((i = get_location(STp, &blk, &bt, 0)) < 0) { 3817 retval = i; 3818 goto out; 3819 } 3820 mt_pos.mt_blkno = blk; 3821 retval = put_user_mtpos(p, &mt_pos); 3822 goto out; 3823 } 3824 mutex_unlock(&STp->lock); 3825 switch (cmd_in) { 3826 case SCSI_IOCTL_STOP_UNIT: 3827 /* unload */ 3828 retval = scsi_ioctl(STp->device, cmd_in, p); 3829 if (!retval) { 3830 STp->rew_at_close = 0; 3831 STp->ready = ST_NO_TAPE; 3832 } 3833 return retval; 3834 3835 case SCSI_IOCTL_GET_IDLUN: 3836 case SCSI_IOCTL_GET_BUS_NUMBER: 3837 break; 3838 3839 default: 3840 if ((cmd_in == SG_IO || 3841 cmd_in == SCSI_IOCTL_SEND_COMMAND || 3842 cmd_in == CDROM_SEND_PACKET) && 3843 !capable(CAP_SYS_RAWIO)) 3844 i = -EPERM; 3845 else 3846 i = scsi_cmd_ioctl(STp->disk->queue, STp->disk, 3847 file->f_mode, cmd_in, p); 3848 if (i != -ENOTTY) 3849 return i; 3850 break; 3851 } 3852 return -ENOTTY; 3853 3854 out: 3855 mutex_unlock(&STp->lock); 3856 return retval; 3857 } 3858 3859 static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3860 { 3861 void __user *p = (void __user *)arg; 3862 struct scsi_tape *STp = file->private_data; 3863 int ret; 3864 3865 ret = st_ioctl_common(file, cmd_in, p); 3866 if (ret != -ENOTTY) 3867 return ret; 3868 3869 return scsi_ioctl(STp->device, cmd_in, p); 3870 } 3871 3872 #ifdef CONFIG_COMPAT 3873 static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) 3874 { 3875 void __user *p = compat_ptr(arg); 3876 struct scsi_tape *STp = file->private_data; 3877 int ret; 3878 3879 /* argument conversion is handled using put_user_mtpos/put_user_mtget */ 3880 switch (cmd_in) { 3881 case MTIOCPOS32: 3882 return st_ioctl_common(file, MTIOCPOS, p); 3883 case MTIOCGET32: 3884 return st_ioctl_common(file, MTIOCGET, p); 3885 } 3886 3887 ret = st_ioctl_common(file, cmd_in, p); 3888 if (ret != -ENOTTY) 3889 return ret; 3890 3891 return scsi_compat_ioctl(STp->device, cmd_in, p); 3892 } 3893 #endif 3894 3895 3896 3897 /* Try to allocate a new tape buffer. Calling function must not hold 3898 dev_arr_lock. */ 3899 static struct st_buffer *new_tape_buffer(int need_dma, int max_sg) 3900 { 3901 struct st_buffer *tb; 3902 3903 tb = kzalloc(sizeof(struct st_buffer), GFP_KERNEL); 3904 if (!tb) { 3905 printk(KERN_NOTICE "st: Can't allocate new tape buffer.\n"); 3906 return NULL; 3907 } 3908 tb->frp_segs = 0; 3909 tb->use_sg = max_sg; 3910 tb->dma = need_dma; 3911 tb->buffer_size = 0; 3912 3913 tb->reserved_pages = kcalloc(max_sg, sizeof(struct page *), 3914 GFP_KERNEL); 3915 if (!tb->reserved_pages) { 3916 kfree(tb); 3917 return NULL; 3918 } 3919 3920 return tb; 3921 } 3922 3923 3924 /* Try to allocate enough space in the tape buffer */ 3925 #define ST_MAX_ORDER 6 3926 3927 static int enlarge_buffer(struct st_buffer * STbuffer, int new_size, int need_dma) 3928 { 3929 int segs, max_segs, b_size, order, got; 3930 gfp_t priority; 3931 3932 if (new_size <= STbuffer->buffer_size) 3933 return 1; 3934 3935 if (STbuffer->buffer_size <= PAGE_SIZE) 3936 normalize_buffer(STbuffer); /* Avoid extra segment */ 3937 3938 max_segs = STbuffer->use_sg; 3939 3940 priority = GFP_KERNEL | __GFP_NOWARN; 3941 if (need_dma) 3942 priority |= GFP_DMA; 3943 3944 if (STbuffer->cleared) 3945 priority |= __GFP_ZERO; 3946 3947 if (STbuffer->frp_segs) { 3948 order = STbuffer->reserved_page_order; 3949 b_size = PAGE_SIZE << order; 3950 } else { 3951 for (b_size = PAGE_SIZE, order = 0; 3952 order < ST_MAX_ORDER && 3953 max_segs * (PAGE_SIZE << order) < new_size; 3954 order++, b_size *= 2) 3955 ; /* empty */ 3956 STbuffer->reserved_page_order = order; 3957 } 3958 if (max_segs * (PAGE_SIZE << order) < new_size) { 3959 if (order == ST_MAX_ORDER) 3960 return 0; 3961 normalize_buffer(STbuffer); 3962 return enlarge_buffer(STbuffer, new_size, need_dma); 3963 } 3964 3965 for (segs = STbuffer->frp_segs, got = STbuffer->buffer_size; 3966 segs < max_segs && got < new_size;) { 3967 struct page *page; 3968 3969 page = alloc_pages(priority, order); 3970 if (!page) { 3971 DEB(STbuffer->buffer_size = got); 3972 normalize_buffer(STbuffer); 3973 return 0; 3974 } 3975 3976 STbuffer->frp_segs += 1; 3977 got += b_size; 3978 STbuffer->buffer_size = got; 3979 STbuffer->reserved_pages[segs] = page; 3980 segs++; 3981 } 3982 STbuffer->b_data = page_address(STbuffer->reserved_pages[0]); 3983 3984 return 1; 3985 } 3986 3987 3988 /* Make sure that no data from previous user is in the internal buffer */ 3989 static void clear_buffer(struct st_buffer * st_bp) 3990 { 3991 int i; 3992 3993 for (i=0; i < st_bp->frp_segs; i++) 3994 memset(page_address(st_bp->reserved_pages[i]), 0, 3995 PAGE_SIZE << st_bp->reserved_page_order); 3996 st_bp->cleared = 1; 3997 } 3998 3999 4000 /* Release the extra buffer */ 4001 static void normalize_buffer(struct st_buffer * STbuffer) 4002 { 4003 int i, order = STbuffer->reserved_page_order; 4004 4005 for (i = 0; i < STbuffer->frp_segs; i++) { 4006 __free_pages(STbuffer->reserved_pages[i], order); 4007 STbuffer->buffer_size -= (PAGE_SIZE << order); 4008 } 4009 STbuffer->frp_segs = 0; 4010 STbuffer->sg_segs = 0; 4011 STbuffer->reserved_page_order = 0; 4012 STbuffer->map_data.offset = 0; 4013 } 4014 4015 4016 /* Move data from the user buffer to the tape buffer. Returns zero (success) or 4017 negative error code. */ 4018 static int append_to_buffer(const char __user *ubp, struct st_buffer * st_bp, int do_count) 4019 { 4020 int i, cnt, res, offset; 4021 int length = PAGE_SIZE << st_bp->reserved_page_order; 4022 4023 for (i = 0, offset = st_bp->buffer_bytes; 4024 i < st_bp->frp_segs && offset >= length; i++) 4025 offset -= length; 4026 if (i == st_bp->frp_segs) { /* Should never happen */ 4027 printk(KERN_WARNING "st: append_to_buffer offset overflow.\n"); 4028 return (-EIO); 4029 } 4030 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4031 struct page *page = st_bp->reserved_pages[i]; 4032 cnt = length - offset < do_count ? length - offset : do_count; 4033 res = copy_from_user(page_address(page) + offset, ubp, cnt); 4034 if (res) 4035 return (-EFAULT); 4036 do_count -= cnt; 4037 st_bp->buffer_bytes += cnt; 4038 ubp += cnt; 4039 offset = 0; 4040 } 4041 if (do_count) /* Should never happen */ 4042 return (-EIO); 4043 4044 return 0; 4045 } 4046 4047 4048 /* Move data from the tape buffer to the user buffer. Returns zero (success) or 4049 negative error code. */ 4050 static int from_buffer(struct st_buffer * st_bp, char __user *ubp, int do_count) 4051 { 4052 int i, cnt, res, offset; 4053 int length = PAGE_SIZE << st_bp->reserved_page_order; 4054 4055 for (i = 0, offset = st_bp->read_pointer; 4056 i < st_bp->frp_segs && offset >= length; i++) 4057 offset -= length; 4058 if (i == st_bp->frp_segs) { /* Should never happen */ 4059 printk(KERN_WARNING "st: from_buffer offset overflow.\n"); 4060 return (-EIO); 4061 } 4062 for (; i < st_bp->frp_segs && do_count > 0; i++) { 4063 struct page *page = st_bp->reserved_pages[i]; 4064 cnt = length - offset < do_count ? length - offset : do_count; 4065 res = copy_to_user(ubp, page_address(page) + offset, cnt); 4066 if (res) 4067 return (-EFAULT); 4068 do_count -= cnt; 4069 st_bp->buffer_bytes -= cnt; 4070 st_bp->read_pointer += cnt; 4071 ubp += cnt; 4072 offset = 0; 4073 } 4074 if (do_count) /* Should never happen */ 4075 return (-EIO); 4076 4077 return 0; 4078 } 4079 4080 4081 /* Move data towards start of buffer */ 4082 static void move_buffer_data(struct st_buffer * st_bp, int offset) 4083 { 4084 int src_seg, dst_seg, src_offset = 0, dst_offset; 4085 int count, total; 4086 int length = PAGE_SIZE << st_bp->reserved_page_order; 4087 4088 if (offset == 0) 4089 return; 4090 4091 total=st_bp->buffer_bytes - offset; 4092 for (src_seg=0; src_seg < st_bp->frp_segs; src_seg++) { 4093 src_offset = offset; 4094 if (src_offset < length) 4095 break; 4096 offset -= length; 4097 } 4098 4099 st_bp->buffer_bytes = st_bp->read_pointer = total; 4100 for (dst_seg=dst_offset=0; total > 0; ) { 4101 struct page *dpage = st_bp->reserved_pages[dst_seg]; 4102 struct page *spage = st_bp->reserved_pages[src_seg]; 4103 4104 count = min(length - dst_offset, length - src_offset); 4105 memmove(page_address(dpage) + dst_offset, 4106 page_address(spage) + src_offset, count); 4107 src_offset += count; 4108 if (src_offset >= length) { 4109 src_seg++; 4110 src_offset = 0; 4111 } 4112 dst_offset += count; 4113 if (dst_offset >= length) { 4114 dst_seg++; 4115 dst_offset = 0; 4116 } 4117 total -= count; 4118 } 4119 } 4120 4121 /* Validate the options from command line or module parameters */ 4122 static void validate_options(void) 4123 { 4124 if (buffer_kbs > 0) 4125 st_fixed_buffer_size = buffer_kbs * ST_KILOBYTE; 4126 if (max_sg_segs >= ST_FIRST_SG) 4127 st_max_sg_segs = max_sg_segs; 4128 } 4129 4130 #ifndef MODULE 4131 /* Set the boot options. Syntax is defined in Documenation/scsi/st.txt. 4132 */ 4133 static int __init st_setup(char *str) 4134 { 4135 int i, len, ints[5]; 4136 char *stp; 4137 4138 stp = get_options(str, ARRAY_SIZE(ints), ints); 4139 4140 if (ints[0] > 0) { 4141 for (i = 0; i < ints[0] && i < ARRAY_SIZE(parms); i++) 4142 if (parms[i].val) 4143 *parms[i].val = ints[i + 1]; 4144 } else { 4145 while (stp != NULL) { 4146 for (i = 0; i < ARRAY_SIZE(parms); i++) { 4147 len = strlen(parms[i].name); 4148 if (!strncmp(stp, parms[i].name, len) && 4149 (*(stp + len) == ':' || *(stp + len) == '=')) { 4150 if (parms[i].val) 4151 *parms[i].val = 4152 simple_strtoul(stp + len + 1, NULL, 0); 4153 else 4154 printk(KERN_WARNING "st: Obsolete parameter %s\n", 4155 parms[i].name); 4156 break; 4157 } 4158 } 4159 if (i >= ARRAY_SIZE(parms)) 4160 printk(KERN_WARNING "st: invalid parameter in '%s'\n", 4161 stp); 4162 stp = strchr(stp, ','); 4163 if (stp) 4164 stp++; 4165 } 4166 } 4167 4168 validate_options(); 4169 4170 return 1; 4171 } 4172 4173 __setup("st=", st_setup); 4174 4175 #endif 4176 4177 static const struct file_operations st_fops = 4178 { 4179 .owner = THIS_MODULE, 4180 .read = st_read, 4181 .write = st_write, 4182 .unlocked_ioctl = st_ioctl, 4183 #ifdef CONFIG_COMPAT 4184 .compat_ioctl = st_compat_ioctl, 4185 #endif 4186 .open = st_open, 4187 .flush = st_flush, 4188 .release = st_release, 4189 .llseek = noop_llseek, 4190 }; 4191 4192 static int create_one_cdev(struct scsi_tape *tape, int mode, int rew) 4193 { 4194 int i, error; 4195 dev_t cdev_devno; 4196 struct cdev *cdev; 4197 struct device *dev; 4198 struct st_modedef *STm = &(tape->modes[mode]); 4199 char name[10]; 4200 int dev_num = tape->index; 4201 4202 cdev_devno = MKDEV(SCSI_TAPE_MAJOR, TAPE_MINOR(dev_num, mode, rew)); 4203 4204 cdev = cdev_alloc(); 4205 if (!cdev) { 4206 pr_err("st%d: out of memory. Device not attached.\n", dev_num); 4207 error = -ENOMEM; 4208 goto out; 4209 } 4210 cdev->owner = THIS_MODULE; 4211 cdev->ops = &st_fops; 4212 STm->cdevs[rew] = cdev; 4213 4214 error = cdev_add(cdev, cdev_devno, 1); 4215 if (error) { 4216 pr_err("st%d: Can't add %s-rewind mode %d\n", dev_num, 4217 rew ? "non" : "auto", mode); 4218 pr_err("st%d: Device not attached.\n", dev_num); 4219 goto out_free; 4220 } 4221 4222 i = mode << (4 - ST_NBR_MODE_BITS); 4223 snprintf(name, 10, "%s%s%s", rew ? "n" : "", 4224 tape->disk->disk_name, st_formats[i]); 4225 4226 dev = device_create(&st_sysfs_class, &tape->device->sdev_gendev, 4227 cdev_devno, &tape->modes[mode], "%s", name); 4228 if (IS_ERR(dev)) { 4229 pr_err("st%d: device_create failed\n", dev_num); 4230 error = PTR_ERR(dev); 4231 goto out_free; 4232 } 4233 4234 STm->devs[rew] = dev; 4235 4236 return 0; 4237 out_free: 4238 cdev_del(STm->cdevs[rew]); 4239 out: 4240 STm->cdevs[rew] = NULL; 4241 STm->devs[rew] = NULL; 4242 return error; 4243 } 4244 4245 static int create_cdevs(struct scsi_tape *tape) 4246 { 4247 int mode, error; 4248 for (mode = 0; mode < ST_NBR_MODES; ++mode) { 4249 error = create_one_cdev(tape, mode, 0); 4250 if (error) 4251 return error; 4252 error = create_one_cdev(tape, mode, 1); 4253 if (error) 4254 return error; 4255 } 4256 4257 return sysfs_create_link(&tape->device->sdev_gendev.kobj, 4258 &tape->modes[0].devs[0]->kobj, "tape"); 4259 } 4260 4261 static void remove_cdevs(struct scsi_tape *tape) 4262 { 4263 int mode, rew; 4264 sysfs_remove_link(&tape->device->sdev_gendev.kobj, "tape"); 4265 for (mode = 0; mode < ST_NBR_MODES; mode++) { 4266 struct st_modedef *STm = &(tape->modes[mode]); 4267 for (rew = 0; rew < 2; rew++) { 4268 if (STm->cdevs[rew]) 4269 cdev_del(STm->cdevs[rew]); 4270 if (STm->devs[rew]) 4271 device_unregister(STm->devs[rew]); 4272 } 4273 } 4274 } 4275 4276 static int st_probe(struct device *dev) 4277 { 4278 struct scsi_device *SDp = to_scsi_device(dev); 4279 struct gendisk *disk = NULL; 4280 struct scsi_tape *tpnt = NULL; 4281 struct st_modedef *STm; 4282 struct st_partstat *STps; 4283 struct st_buffer *buffer; 4284 int i, error; 4285 char *stp; 4286 4287 if (SDp->type != TYPE_TAPE) 4288 return -ENODEV; 4289 if ((stp = st_incompatible(SDp))) { 4290 sdev_printk(KERN_INFO, SDp, 4291 "OnStream tapes are no longer supported;\n"); 4292 sdev_printk(KERN_INFO, SDp, 4293 "please mail to linux-scsi@vger.kernel.org.\n"); 4294 return -ENODEV; 4295 } 4296 4297 scsi_autopm_get_device(SDp); 4298 i = queue_max_segments(SDp->request_queue); 4299 if (st_max_sg_segs < i) 4300 i = st_max_sg_segs; 4301 buffer = new_tape_buffer((SDp->host)->unchecked_isa_dma, i); 4302 if (buffer == NULL) { 4303 sdev_printk(KERN_ERR, SDp, 4304 "st: Can't allocate new tape buffer. " 4305 "Device not attached.\n"); 4306 goto out; 4307 } 4308 4309 disk = alloc_disk(1); 4310 if (!disk) { 4311 sdev_printk(KERN_ERR, SDp, 4312 "st: out of memory. Device not attached.\n"); 4313 goto out_buffer_free; 4314 } 4315 4316 tpnt = kzalloc(sizeof(struct scsi_tape), GFP_KERNEL); 4317 if (tpnt == NULL) { 4318 sdev_printk(KERN_ERR, SDp, 4319 "st: Can't allocate device descriptor.\n"); 4320 goto out_put_disk; 4321 } 4322 kref_init(&tpnt->kref); 4323 tpnt->disk = disk; 4324 disk->private_data = &tpnt->driver; 4325 /* SCSI tape doesn't register this gendisk via add_disk(). Manually 4326 * take queue reference that release_disk() expects. */ 4327 if (!blk_get_queue(SDp->request_queue)) 4328 goto out_put_disk; 4329 disk->queue = SDp->request_queue; 4330 tpnt->driver = &st_template; 4331 4332 tpnt->device = SDp; 4333 if (SDp->scsi_level <= 2) 4334 tpnt->tape_type = MT_ISSCSI1; 4335 else 4336 tpnt->tape_type = MT_ISSCSI2; 4337 4338 tpnt->buffer = buffer; 4339 tpnt->buffer->last_SRpnt = NULL; 4340 4341 tpnt->inited = 0; 4342 tpnt->dirty = 0; 4343 tpnt->in_use = 0; 4344 tpnt->drv_buffer = 1; /* Try buffering if no mode sense */ 4345 tpnt->restr_dma = (SDp->host)->unchecked_isa_dma; 4346 tpnt->use_pf = (SDp->scsi_level >= SCSI_2); 4347 tpnt->density = 0; 4348 tpnt->do_auto_lock = ST_AUTO_LOCK; 4349 tpnt->can_bsr = (SDp->scsi_level > 2 ? 1 : ST_IN_FILE_POS); /* BSR mandatory in SCSI3 */ 4350 tpnt->can_partitions = 0; 4351 tpnt->two_fm = ST_TWO_FM; 4352 tpnt->fast_mteom = ST_FAST_MTEOM; 4353 tpnt->scsi2_logical = ST_SCSI2LOGICAL; 4354 tpnt->sili = ST_SILI; 4355 tpnt->immediate = ST_NOWAIT; 4356 tpnt->immediate_filemark = 0; 4357 tpnt->default_drvbuffer = 0xff; /* No forced buffering */ 4358 tpnt->partition = 0; 4359 tpnt->new_partition = 0; 4360 tpnt->nbr_partitions = 0; 4361 blk_queue_rq_timeout(tpnt->device->request_queue, ST_TIMEOUT); 4362 tpnt->long_timeout = ST_LONG_TIMEOUT; 4363 tpnt->try_dio = try_direct_io && !SDp->host->unchecked_isa_dma; 4364 4365 for (i = 0; i < ST_NBR_MODES; i++) { 4366 STm = &(tpnt->modes[i]); 4367 STm->defined = 0; 4368 STm->sysv = ST_SYSV; 4369 STm->defaults_for_writes = 0; 4370 STm->do_async_writes = ST_ASYNC_WRITES; 4371 STm->do_buffer_writes = ST_BUFFER_WRITES; 4372 STm->do_read_ahead = ST_READ_AHEAD; 4373 STm->default_compression = ST_DONT_TOUCH; 4374 STm->default_blksize = (-1); /* No forced size */ 4375 STm->default_density = (-1); /* No forced density */ 4376 STm->tape = tpnt; 4377 } 4378 4379 for (i = 0; i < ST_NBR_PARTITIONS; i++) { 4380 STps = &(tpnt->ps[i]); 4381 STps->rw = ST_IDLE; 4382 STps->eof = ST_NOEOF; 4383 STps->at_sm = 0; 4384 STps->last_block_valid = 0; 4385 STps->drv_block = (-1); 4386 STps->drv_file = (-1); 4387 } 4388 4389 tpnt->current_mode = 0; 4390 tpnt->modes[0].defined = 1; 4391 4392 tpnt->density_changed = tpnt->compression_changed = 4393 tpnt->blksize_changed = 0; 4394 mutex_init(&tpnt->lock); 4395 4396 idr_preload(GFP_KERNEL); 4397 spin_lock(&st_index_lock); 4398 error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT); 4399 spin_unlock(&st_index_lock); 4400 idr_preload_end(); 4401 if (error < 0) { 4402 pr_warn("st: idr allocation failed: %d\n", error); 4403 goto out_put_queue; 4404 } 4405 tpnt->index = error; 4406 sprintf(disk->disk_name, "st%d", tpnt->index); 4407 tpnt->stats = kzalloc(sizeof(struct scsi_tape_stats), GFP_KERNEL); 4408 if (tpnt->stats == NULL) { 4409 sdev_printk(KERN_ERR, SDp, 4410 "st: Can't allocate statistics.\n"); 4411 goto out_idr_remove; 4412 } 4413 4414 dev_set_drvdata(dev, tpnt); 4415 4416 4417 error = create_cdevs(tpnt); 4418 if (error) 4419 goto out_remove_devs; 4420 scsi_autopm_put_device(SDp); 4421 4422 sdev_printk(KERN_NOTICE, SDp, 4423 "Attached scsi tape %s\n", tape_name(tpnt)); 4424 sdev_printk(KERN_INFO, SDp, "%s: try direct i/o: %s (alignment %d B)\n", 4425 tape_name(tpnt), tpnt->try_dio ? "yes" : "no", 4426 queue_dma_alignment(SDp->request_queue) + 1); 4427 4428 return 0; 4429 4430 out_remove_devs: 4431 remove_cdevs(tpnt); 4432 kfree(tpnt->stats); 4433 out_idr_remove: 4434 spin_lock(&st_index_lock); 4435 idr_remove(&st_index_idr, tpnt->index); 4436 spin_unlock(&st_index_lock); 4437 out_put_queue: 4438 blk_put_queue(disk->queue); 4439 out_put_disk: 4440 put_disk(disk); 4441 kfree(tpnt); 4442 out_buffer_free: 4443 kfree(buffer); 4444 out: 4445 scsi_autopm_put_device(SDp); 4446 return -ENODEV; 4447 }; 4448 4449 4450 static int st_remove(struct device *dev) 4451 { 4452 struct scsi_tape *tpnt = dev_get_drvdata(dev); 4453 int index = tpnt->index; 4454 4455 scsi_autopm_get_device(to_scsi_device(dev)); 4456 remove_cdevs(tpnt); 4457 4458 mutex_lock(&st_ref_mutex); 4459 kref_put(&tpnt->kref, scsi_tape_release); 4460 mutex_unlock(&st_ref_mutex); 4461 spin_lock(&st_index_lock); 4462 idr_remove(&st_index_idr, index); 4463 spin_unlock(&st_index_lock); 4464 return 0; 4465 } 4466 4467 /** 4468 * scsi_tape_release - Called to free the Scsi_Tape structure 4469 * @kref: pointer to embedded kref 4470 * 4471 * st_ref_mutex must be held entering this routine. Because it is 4472 * called on last put, you should always use the scsi_tape_get() 4473 * scsi_tape_put() helpers which manipulate the semaphore directly 4474 * and never do a direct kref_put(). 4475 **/ 4476 static void scsi_tape_release(struct kref *kref) 4477 { 4478 struct scsi_tape *tpnt = to_scsi_tape(kref); 4479 struct gendisk *disk = tpnt->disk; 4480 4481 tpnt->device = NULL; 4482 4483 if (tpnt->buffer) { 4484 normalize_buffer(tpnt->buffer); 4485 kfree(tpnt->buffer->reserved_pages); 4486 kfree(tpnt->buffer); 4487 } 4488 4489 disk->private_data = NULL; 4490 put_disk(disk); 4491 kfree(tpnt->stats); 4492 kfree(tpnt); 4493 return; 4494 } 4495 4496 static struct class st_sysfs_class = { 4497 .name = "scsi_tape", 4498 .dev_groups = st_dev_groups, 4499 }; 4500 4501 static int __init init_st(void) 4502 { 4503 int err; 4504 4505 validate_options(); 4506 4507 printk(KERN_INFO "st: Version %s, fixed bufsize %d, s/g segs %d\n", 4508 verstr, st_fixed_buffer_size, st_max_sg_segs); 4509 4510 debugging = (debug_flag > 0) ? debug_flag : NO_DEBUG; 4511 if (debugging) { 4512 printk(KERN_INFO "st: Debugging enabled debug_flag = %d\n", 4513 debugging); 4514 } 4515 4516 err = class_register(&st_sysfs_class); 4517 if (err) { 4518 pr_err("Unable register sysfs class for SCSI tapes\n"); 4519 return err; 4520 } 4521 4522 err = register_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4523 ST_MAX_TAPE_ENTRIES, "st"); 4524 if (err) { 4525 printk(KERN_ERR "Unable to get major %d for SCSI tapes\n", 4526 SCSI_TAPE_MAJOR); 4527 goto err_class; 4528 } 4529 4530 err = scsi_register_driver(&st_template.gendrv); 4531 if (err) 4532 goto err_chrdev; 4533 4534 return 0; 4535 4536 err_chrdev: 4537 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4538 ST_MAX_TAPE_ENTRIES); 4539 err_class: 4540 class_unregister(&st_sysfs_class); 4541 return err; 4542 } 4543 4544 static void __exit exit_st(void) 4545 { 4546 scsi_unregister_driver(&st_template.gendrv); 4547 unregister_chrdev_region(MKDEV(SCSI_TAPE_MAJOR, 0), 4548 ST_MAX_TAPE_ENTRIES); 4549 class_unregister(&st_sysfs_class); 4550 idr_destroy(&st_index_idr); 4551 printk(KERN_INFO "st: Unloaded.\n"); 4552 } 4553 4554 module_init(init_st); 4555 module_exit(exit_st); 4556 4557 4558 /* The sysfs driver interface. Read-only at the moment */ 4559 static ssize_t try_direct_io_show(struct device_driver *ddp, char *buf) 4560 { 4561 return scnprintf(buf, PAGE_SIZE, "%d\n", try_direct_io); 4562 } 4563 static DRIVER_ATTR_RO(try_direct_io); 4564 4565 static ssize_t fixed_buffer_size_show(struct device_driver *ddp, char *buf) 4566 { 4567 return scnprintf(buf, PAGE_SIZE, "%d\n", st_fixed_buffer_size); 4568 } 4569 static DRIVER_ATTR_RO(fixed_buffer_size); 4570 4571 static ssize_t max_sg_segs_show(struct device_driver *ddp, char *buf) 4572 { 4573 return scnprintf(buf, PAGE_SIZE, "%d\n", st_max_sg_segs); 4574 } 4575 static DRIVER_ATTR_RO(max_sg_segs); 4576 4577 static ssize_t version_show(struct device_driver *ddd, char *buf) 4578 { 4579 return scnprintf(buf, PAGE_SIZE, "[%s]\n", verstr); 4580 } 4581 static DRIVER_ATTR_RO(version); 4582 4583 #if DEBUG 4584 static ssize_t debug_flag_store(struct device_driver *ddp, 4585 const char *buf, size_t count) 4586 { 4587 /* We only care what the first byte of the data is the rest is unused. 4588 * if it's a '1' we turn on debug and if it's a '0' we disable it. All 4589 * other values have -EINVAL returned if they are passed in. 4590 */ 4591 if (count > 0) { 4592 if (buf[0] == '0') { 4593 debugging = NO_DEBUG; 4594 return count; 4595 } else if (buf[0] == '1') { 4596 debugging = 1; 4597 return count; 4598 } 4599 } 4600 return -EINVAL; 4601 } 4602 4603 static ssize_t debug_flag_show(struct device_driver *ddp, char *buf) 4604 { 4605 return scnprintf(buf, PAGE_SIZE, "%d\n", debugging); 4606 } 4607 static DRIVER_ATTR_RW(debug_flag); 4608 #endif 4609 4610 static struct attribute *st_drv_attrs[] = { 4611 &driver_attr_try_direct_io.attr, 4612 &driver_attr_fixed_buffer_size.attr, 4613 &driver_attr_max_sg_segs.attr, 4614 &driver_attr_version.attr, 4615 #if DEBUG 4616 &driver_attr_debug_flag.attr, 4617 #endif 4618 NULL, 4619 }; 4620 ATTRIBUTE_GROUPS(st_drv); 4621 4622 /* The sysfs simple class interface */ 4623 static ssize_t 4624 defined_show(struct device *dev, struct device_attribute *attr, char *buf) 4625 { 4626 struct st_modedef *STm = dev_get_drvdata(dev); 4627 ssize_t l = 0; 4628 4629 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->defined); 4630 return l; 4631 } 4632 static DEVICE_ATTR_RO(defined); 4633 4634 static ssize_t 4635 default_blksize_show(struct device *dev, struct device_attribute *attr, 4636 char *buf) 4637 { 4638 struct st_modedef *STm = dev_get_drvdata(dev); 4639 ssize_t l = 0; 4640 4641 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_blksize); 4642 return l; 4643 } 4644 static DEVICE_ATTR_RO(default_blksize); 4645 4646 static ssize_t 4647 default_density_show(struct device *dev, struct device_attribute *attr, 4648 char *buf) 4649 { 4650 struct st_modedef *STm = dev_get_drvdata(dev); 4651 ssize_t l = 0; 4652 char *fmt; 4653 4654 fmt = STm->default_density >= 0 ? "0x%02x\n" : "%d\n"; 4655 l = snprintf(buf, PAGE_SIZE, fmt, STm->default_density); 4656 return l; 4657 } 4658 static DEVICE_ATTR_RO(default_density); 4659 4660 static ssize_t 4661 default_compression_show(struct device *dev, struct device_attribute *attr, 4662 char *buf) 4663 { 4664 struct st_modedef *STm = dev_get_drvdata(dev); 4665 ssize_t l = 0; 4666 4667 l = snprintf(buf, PAGE_SIZE, "%d\n", STm->default_compression - 1); 4668 return l; 4669 } 4670 static DEVICE_ATTR_RO(default_compression); 4671 4672 static ssize_t 4673 options_show(struct device *dev, struct device_attribute *attr, char *buf) 4674 { 4675 struct st_modedef *STm = dev_get_drvdata(dev); 4676 struct scsi_tape *STp = STm->tape; 4677 int options; 4678 ssize_t l = 0; 4679 4680 options = STm->do_buffer_writes ? MT_ST_BUFFER_WRITES : 0; 4681 options |= STm->do_async_writes ? MT_ST_ASYNC_WRITES : 0; 4682 options |= STm->do_read_ahead ? MT_ST_READ_AHEAD : 0; 4683 DEB( options |= debugging ? MT_ST_DEBUGGING : 0 ); 4684 options |= STp->two_fm ? MT_ST_TWO_FM : 0; 4685 options |= STp->fast_mteom ? MT_ST_FAST_MTEOM : 0; 4686 options |= STm->defaults_for_writes ? MT_ST_DEF_WRITES : 0; 4687 options |= STp->can_bsr ? MT_ST_CAN_BSR : 0; 4688 options |= STp->omit_blklims ? MT_ST_NO_BLKLIMS : 0; 4689 options |= STp->can_partitions ? MT_ST_CAN_PARTITIONS : 0; 4690 options |= STp->scsi2_logical ? MT_ST_SCSI2LOGICAL : 0; 4691 options |= STm->sysv ? MT_ST_SYSV : 0; 4692 options |= STp->immediate ? MT_ST_NOWAIT : 0; 4693 options |= STp->immediate_filemark ? MT_ST_NOWAIT_EOF : 0; 4694 options |= STp->sili ? MT_ST_SILI : 0; 4695 4696 l = snprintf(buf, PAGE_SIZE, "0x%08x\n", options); 4697 return l; 4698 } 4699 static DEVICE_ATTR_RO(options); 4700 4701 /* Support for tape stats */ 4702 4703 /** 4704 * read_cnt_show - return read count - count of reads made from tape drive 4705 * @dev: struct device 4706 * @attr: attribute structure 4707 * @buf: buffer to return formatted data in 4708 */ 4709 static ssize_t read_cnt_show(struct device *dev, 4710 struct device_attribute *attr, char *buf) 4711 { 4712 struct st_modedef *STm = dev_get_drvdata(dev); 4713 4714 return sprintf(buf, "%lld", 4715 (long long)atomic64_read(&STm->tape->stats->read_cnt)); 4716 } 4717 static DEVICE_ATTR_RO(read_cnt); 4718 4719 /** 4720 * read_byte_cnt_show - return read byte count - tape drives 4721 * may use blocks less than 512 bytes this gives the raw byte count of 4722 * of data read from the tape drive. 4723 * @dev: struct device 4724 * @attr: attribute structure 4725 * @buf: buffer to return formatted data in 4726 */ 4727 static ssize_t read_byte_cnt_show(struct device *dev, 4728 struct device_attribute *attr, char *buf) 4729 { 4730 struct st_modedef *STm = dev_get_drvdata(dev); 4731 4732 return sprintf(buf, "%lld", 4733 (long long)atomic64_read(&STm->tape->stats->read_byte_cnt)); 4734 } 4735 static DEVICE_ATTR_RO(read_byte_cnt); 4736 4737 /** 4738 * read_ns_show - return read ns - overall time spent waiting on reads in ns. 4739 * @dev: struct device 4740 * @attr: attribute structure 4741 * @buf: buffer to return formatted data in 4742 */ 4743 static ssize_t read_ns_show(struct device *dev, 4744 struct device_attribute *attr, char *buf) 4745 { 4746 struct st_modedef *STm = dev_get_drvdata(dev); 4747 4748 return sprintf(buf, "%lld", 4749 (long long)atomic64_read(&STm->tape->stats->tot_read_time)); 4750 } 4751 static DEVICE_ATTR_RO(read_ns); 4752 4753 /** 4754 * write_cnt_show - write count - number of user calls 4755 * to write(2) that have written data to tape. 4756 * @dev: struct device 4757 * @attr: attribute structure 4758 * @buf: buffer to return formatted data in 4759 */ 4760 static ssize_t write_cnt_show(struct device *dev, 4761 struct device_attribute *attr, char *buf) 4762 { 4763 struct st_modedef *STm = dev_get_drvdata(dev); 4764 4765 return sprintf(buf, "%lld", 4766 (long long)atomic64_read(&STm->tape->stats->write_cnt)); 4767 } 4768 static DEVICE_ATTR_RO(write_cnt); 4769 4770 /** 4771 * write_byte_cnt_show - write byte count - raw count of 4772 * bytes written to tape. 4773 * @dev: struct device 4774 * @attr: attribute structure 4775 * @buf: buffer to return formatted data in 4776 */ 4777 static ssize_t write_byte_cnt_show(struct device *dev, 4778 struct device_attribute *attr, char *buf) 4779 { 4780 struct st_modedef *STm = dev_get_drvdata(dev); 4781 4782 return sprintf(buf, "%lld", 4783 (long long)atomic64_read(&STm->tape->stats->write_byte_cnt)); 4784 } 4785 static DEVICE_ATTR_RO(write_byte_cnt); 4786 4787 /** 4788 * write_ns_show - write ns - number of nanoseconds waiting on write 4789 * requests to complete. 4790 * @dev: struct device 4791 * @attr: attribute structure 4792 * @buf: buffer to return formatted data in 4793 */ 4794 static ssize_t write_ns_show(struct device *dev, 4795 struct device_attribute *attr, char *buf) 4796 { 4797 struct st_modedef *STm = dev_get_drvdata(dev); 4798 4799 return sprintf(buf, "%lld", 4800 (long long)atomic64_read(&STm->tape->stats->tot_write_time)); 4801 } 4802 static DEVICE_ATTR_RO(write_ns); 4803 4804 /** 4805 * in_flight_show - number of I/Os currently in flight - 4806 * in most cases this will be either 0 or 1. It may be higher if someone 4807 * has also issued other SCSI commands such as via an ioctl. 4808 * @dev: struct device 4809 * @attr: attribute structure 4810 * @buf: buffer to return formatted data in 4811 */ 4812 static ssize_t in_flight_show(struct device *dev, 4813 struct device_attribute *attr, char *buf) 4814 { 4815 struct st_modedef *STm = dev_get_drvdata(dev); 4816 4817 return sprintf(buf, "%lld", 4818 (long long)atomic64_read(&STm->tape->stats->in_flight)); 4819 } 4820 static DEVICE_ATTR_RO(in_flight); 4821 4822 /** 4823 * io_ns_show - io wait ns - this is the number of ns spent 4824 * waiting on all I/O to complete. This includes tape movement commands 4825 * such as rewinding, seeking to end of file or tape, it also includes 4826 * read and write. To determine the time spent on tape movement 4827 * subtract the read and write ns from this value. 4828 * @dev: struct device 4829 * @attr: attribute structure 4830 * @buf: buffer to return formatted data in 4831 */ 4832 static ssize_t io_ns_show(struct device *dev, 4833 struct device_attribute *attr, char *buf) 4834 { 4835 struct st_modedef *STm = dev_get_drvdata(dev); 4836 4837 return sprintf(buf, "%lld", 4838 (long long)atomic64_read(&STm->tape->stats->tot_io_time)); 4839 } 4840 static DEVICE_ATTR_RO(io_ns); 4841 4842 /** 4843 * other_cnt_show - other io count - this is the number of 4844 * I/O requests other than read and write requests. 4845 * Typically these are tape movement requests but will include driver 4846 * tape movement. This includes only requests issued by the st driver. 4847 * @dev: struct device 4848 * @attr: attribute structure 4849 * @buf: buffer to return formatted data in 4850 */ 4851 static ssize_t other_cnt_show(struct device *dev, 4852 struct device_attribute *attr, char *buf) 4853 { 4854 struct st_modedef *STm = dev_get_drvdata(dev); 4855 4856 return sprintf(buf, "%lld", 4857 (long long)atomic64_read(&STm->tape->stats->other_cnt)); 4858 } 4859 static DEVICE_ATTR_RO(other_cnt); 4860 4861 /** 4862 * resid_cnt_show - A count of the number of times we get a residual 4863 * count - this should indicate someone issuing reads larger than the 4864 * block size on tape. 4865 * @dev: struct device 4866 * @attr: attribute structure 4867 * @buf: buffer to return formatted data in 4868 */ 4869 static ssize_t resid_cnt_show(struct device *dev, 4870 struct device_attribute *attr, char *buf) 4871 { 4872 struct st_modedef *STm = dev_get_drvdata(dev); 4873 4874 return sprintf(buf, "%lld", 4875 (long long)atomic64_read(&STm->tape->stats->resid_cnt)); 4876 } 4877 static DEVICE_ATTR_RO(resid_cnt); 4878 4879 static struct attribute *st_dev_attrs[] = { 4880 &dev_attr_defined.attr, 4881 &dev_attr_default_blksize.attr, 4882 &dev_attr_default_density.attr, 4883 &dev_attr_default_compression.attr, 4884 &dev_attr_options.attr, 4885 NULL, 4886 }; 4887 4888 static struct attribute *st_stats_attrs[] = { 4889 &dev_attr_read_cnt.attr, 4890 &dev_attr_read_byte_cnt.attr, 4891 &dev_attr_read_ns.attr, 4892 &dev_attr_write_cnt.attr, 4893 &dev_attr_write_byte_cnt.attr, 4894 &dev_attr_write_ns.attr, 4895 &dev_attr_in_flight.attr, 4896 &dev_attr_io_ns.attr, 4897 &dev_attr_other_cnt.attr, 4898 &dev_attr_resid_cnt.attr, 4899 NULL, 4900 }; 4901 4902 static struct attribute_group stats_group = { 4903 .name = "stats", 4904 .attrs = st_stats_attrs, 4905 }; 4906 4907 static struct attribute_group st_group = { 4908 .attrs = st_dev_attrs, 4909 }; 4910 4911 static const struct attribute_group *st_dev_groups[] = { 4912 &st_group, 4913 &stats_group, 4914 NULL, 4915 }; 4916 4917 /* The following functions may be useful for a larger audience. */ 4918 static int sgl_map_user_pages(struct st_buffer *STbp, 4919 const unsigned int max_pages, unsigned long uaddr, 4920 size_t count, int rw) 4921 { 4922 unsigned long end = (uaddr + count + PAGE_SIZE - 1) >> PAGE_SHIFT; 4923 unsigned long start = uaddr >> PAGE_SHIFT; 4924 const int nr_pages = end - start; 4925 int res, i, j; 4926 struct page **pages; 4927 struct rq_map_data *mdata = &STbp->map_data; 4928 4929 /* User attempted Overflow! */ 4930 if ((uaddr + count) < uaddr) 4931 return -EINVAL; 4932 4933 /* Too big */ 4934 if (nr_pages > max_pages) 4935 return -ENOMEM; 4936 4937 /* Hmm? */ 4938 if (count == 0) 4939 return 0; 4940 4941 pages = kmalloc_array(max_pages, sizeof(*pages), GFP_KERNEL); 4942 if (pages == NULL) 4943 return -ENOMEM; 4944 4945 /* Try to fault in all of the necessary pages */ 4946 /* rw==READ means read from drive, write into memory area */ 4947 res = get_user_pages_fast(uaddr, nr_pages, rw == READ ? FOLL_WRITE : 0, 4948 pages); 4949 4950 /* Errors and no page mapped should return here */ 4951 if (res < nr_pages) 4952 goto out_unmap; 4953 4954 for (i=0; i < nr_pages; i++) { 4955 /* FIXME: flush superflous for rw==READ, 4956 * probably wrong function for rw==WRITE 4957 */ 4958 flush_dcache_page(pages[i]); 4959 } 4960 4961 mdata->offset = uaddr & ~PAGE_MASK; 4962 STbp->mapped_pages = pages; 4963 4964 return nr_pages; 4965 out_unmap: 4966 if (res > 0) { 4967 for (j=0; j < res; j++) 4968 put_page(pages[j]); 4969 res = 0; 4970 } 4971 kfree(pages); 4972 return res; 4973 } 4974 4975 4976 /* And unmap them... */ 4977 static int sgl_unmap_user_pages(struct st_buffer *STbp, 4978 const unsigned int nr_pages, int dirtied) 4979 { 4980 int i; 4981 4982 for (i=0; i < nr_pages; i++) { 4983 struct page *page = STbp->mapped_pages[i]; 4984 4985 if (dirtied) 4986 SetPageDirty(page); 4987 /* FIXME: cache flush missing for rw==READ 4988 * FIXME: call the correct reference counting function 4989 */ 4990 put_page(page); 4991 } 4992 kfree(STbp->mapped_pages); 4993 STbp->mapped_pages = NULL; 4994 4995 return 0; 4996 } 4997