1 /* 2 * History: 3 * Started: Aug 9 by Lawrence Foard (entropy@world.std.com), 4 * to allow user process control of SCSI devices. 5 * Development Sponsored by Killy Corp. NY NY 6 * 7 * Original driver (sg.c): 8 * Copyright (C) 1992 Lawrence Foard 9 * Version 2 and 3 extensions to driver: 10 * Copyright (C) 1998 - 2005 Douglas Gilbert 11 * 12 * Modified 19-JAN-1998 Richard Gooch <rgooch@atnf.csiro.au> Devfs support 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2, or (at your option) 17 * any later version. 18 * 19 */ 20 21 static int sg_version_num = 30534; /* 2 digits for each component */ 22 #define SG_VERSION_STR "3.5.34" 23 24 /* 25 * D. P. Gilbert (dgilbert@interlog.com, dougg@triode.net.au), notes: 26 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 27 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 28 * (otherwise the macros compile to empty statements). 29 * 30 */ 31 #include <linux/module.h> 32 33 #include <linux/fs.h> 34 #include <linux/kernel.h> 35 #include <linux/sched.h> 36 #include <linux/string.h> 37 #include <linux/mm.h> 38 #include <linux/errno.h> 39 #include <linux/mtio.h> 40 #include <linux/ioctl.h> 41 #include <linux/slab.h> 42 #include <linux/fcntl.h> 43 #include <linux/init.h> 44 #include <linux/poll.h> 45 #include <linux/moduleparam.h> 46 #include <linux/cdev.h> 47 #include <linux/idr.h> 48 #include <linux/seq_file.h> 49 #include <linux/blkdev.h> 50 #include <linux/delay.h> 51 #include <linux/blktrace_api.h> 52 #include <linux/mutex.h> 53 #include <linux/ratelimit.h> 54 55 #include "scsi.h" 56 #include <scsi/scsi_dbg.h> 57 #include <scsi/scsi_host.h> 58 #include <scsi/scsi_driver.h> 59 #include <scsi/scsi_ioctl.h> 60 #include <scsi/sg.h> 61 62 #include "scsi_logging.h" 63 64 #ifdef CONFIG_SCSI_PROC_FS 65 #include <linux/proc_fs.h> 66 static char *sg_version_date = "20061027"; 67 68 static int sg_proc_init(void); 69 static void sg_proc_cleanup(void); 70 #endif 71 72 #define SG_ALLOW_DIO_DEF 0 73 74 #define SG_MAX_DEVS 32768 75 76 /* 77 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 78 * Then when using 32 bit integers x * m may overflow during the calculation. 79 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 80 * calculates the same, but prevents the overflow when both m and d 81 * are "small" numbers (like HZ and USER_HZ). 82 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 83 * in 32 bits. 84 */ 85 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 86 87 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 88 89 int sg_big_buff = SG_DEF_RESERVED_SIZE; 90 /* N.B. This variable is readable and writeable via 91 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 92 of this size (or less if there is not enough memory) will be reserved 93 for use by this file descriptor. [Deprecated usage: this variable is also 94 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 95 the kernel (i.e. it is not a module).] */ 96 static int def_reserved_size = -1; /* picks up init parameter */ 97 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 98 99 static int scatter_elem_sz = SG_SCATTER_SZ; 100 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 101 102 #define SG_SECTOR_SZ 512 103 104 static int sg_add(struct device *, struct class_interface *); 105 static void sg_remove(struct device *, struct class_interface *); 106 107 static DEFINE_MUTEX(sg_mutex); 108 109 static DEFINE_IDR(sg_index_idr); 110 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 111 file descriptor list for device */ 112 113 static struct class_interface sg_interface = { 114 .add_dev = sg_add, 115 .remove_dev = sg_remove, 116 }; 117 118 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 119 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 120 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 121 unsigned bufflen; /* Size of (aggregate) data buffer */ 122 struct page **pages; 123 int page_order; 124 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 125 unsigned char cmd_opcode; /* first byte of command */ 126 } Sg_scatter_hold; 127 128 struct sg_device; /* forward declarations */ 129 struct sg_fd; 130 131 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 132 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 133 struct sg_fd *parentfp; /* NULL -> not in use */ 134 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 135 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 136 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 137 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 138 char orphan; /* 1 -> drop on sight, 0 -> normal */ 139 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 140 volatile char done; /* 0->before bh, 1->before read, 2->read */ 141 struct request *rq; 142 struct bio *bio; 143 struct execute_work ew; 144 } Sg_request; 145 146 typedef struct sg_fd { /* holds the state of a file descriptor */ 147 struct list_head sfd_siblings; 148 struct sg_device *parentdp; /* owning device */ 149 wait_queue_head_t read_wait; /* queue read until command done */ 150 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 151 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 152 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 153 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 154 unsigned save_scat_len; /* original length of trunc. scat. element */ 155 Sg_request *headrp; /* head of request slist, NULL->empty */ 156 struct fasync_struct *async_qp; /* used by asynchronous notification */ 157 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 158 char low_dma; /* as in parent but possibly overridden to 1 */ 159 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 160 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 161 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 162 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 163 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 164 char mmap_called; /* 0 -> mmap() never called on this fd */ 165 struct kref f_ref; 166 struct execute_work ew; 167 } Sg_fd; 168 169 typedef struct sg_device { /* holds the state of each scsi generic device */ 170 struct scsi_device *device; 171 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 172 int sg_tablesize; /* adapter's max scatter-gather table size */ 173 u32 index; /* device index number */ 174 struct list_head sfds; 175 volatile char detached; /* 0->attached, 1->detached pending removal */ 176 volatile char exclude; /* opened for exclusive access */ 177 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 178 struct gendisk *disk; 179 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 180 struct kref d_ref; 181 } Sg_device; 182 183 /* tasklet or soft irq callback */ 184 static void sg_rq_end_io(struct request *rq, int uptodate); 185 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 186 static int sg_finish_rem_req(Sg_request * srp); 187 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 188 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 189 Sg_request * srp); 190 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 191 const char __user *buf, size_t count, int blocking, 192 int read_only, int sg_io_owned, Sg_request **o_srp); 193 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 194 unsigned char *cmnd, int timeout, int blocking); 195 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 196 static void sg_remove_scat(Sg_scatter_hold * schp); 197 static void sg_build_reserve(Sg_fd * sfp, int req_size); 198 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 199 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 200 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 201 static void sg_remove_sfp(struct kref *); 202 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 203 static Sg_request *sg_add_request(Sg_fd * sfp); 204 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 205 static int sg_res_in_use(Sg_fd * sfp); 206 static Sg_device *sg_get_dev(int dev); 207 static void sg_put_dev(Sg_device *sdp); 208 209 #define SZ_SG_HEADER sizeof(struct sg_header) 210 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 211 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 212 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 213 214 static int sg_allow_access(struct file *filp, unsigned char *cmd) 215 { 216 struct sg_fd *sfp = filp->private_data; 217 218 if (sfp->parentdp->device->type == TYPE_SCANNER) 219 return 0; 220 221 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 222 } 223 224 static int 225 sg_open(struct inode *inode, struct file *filp) 226 { 227 int dev = iminor(inode); 228 int flags = filp->f_flags; 229 struct request_queue *q; 230 Sg_device *sdp; 231 Sg_fd *sfp; 232 int res; 233 int retval; 234 235 mutex_lock(&sg_mutex); 236 nonseekable_open(inode, filp); 237 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 238 sdp = sg_get_dev(dev); 239 if (IS_ERR(sdp)) { 240 retval = PTR_ERR(sdp); 241 sdp = NULL; 242 goto sg_put; 243 } 244 245 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 246 /* Prevent the device driver from vanishing while we sleep */ 247 retval = scsi_device_get(sdp->device); 248 if (retval) 249 goto sg_put; 250 251 retval = scsi_autopm_get_device(sdp->device); 252 if (retval) 253 goto sdp_put; 254 255 if (!((flags & O_NONBLOCK) || 256 scsi_block_when_processing_errors(sdp->device))) { 257 retval = -ENXIO; 258 /* we are in error recovery for this device */ 259 goto error_out; 260 } 261 262 if (flags & O_EXCL) { 263 if (O_RDONLY == (flags & O_ACCMODE)) { 264 retval = -EPERM; /* Can't lock it with read only access */ 265 goto error_out; 266 } 267 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) { 268 retval = -EBUSY; 269 goto error_out; 270 } 271 res = 0; 272 __wait_event_interruptible(sdp->o_excl_wait, 273 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 274 if (res) { 275 retval = res; /* -ERESTARTSYS because signal hit process */ 276 goto error_out; 277 } 278 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 279 if (flags & O_NONBLOCK) { 280 retval = -EBUSY; 281 goto error_out; 282 } 283 res = 0; 284 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 285 res); 286 if (res) { 287 retval = res; /* -ERESTARTSYS because signal hit process */ 288 goto error_out; 289 } 290 } 291 if (sdp->detached) { 292 retval = -ENODEV; 293 goto error_out; 294 } 295 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */ 296 sdp->sgdebug = 0; 297 q = sdp->device->request_queue; 298 sdp->sg_tablesize = queue_max_segments(q); 299 } 300 if ((sfp = sg_add_sfp(sdp, dev))) 301 filp->private_data = sfp; 302 else { 303 if (flags & O_EXCL) { 304 sdp->exclude = 0; /* undo if error */ 305 wake_up_interruptible(&sdp->o_excl_wait); 306 } 307 retval = -ENOMEM; 308 goto error_out; 309 } 310 retval = 0; 311 error_out: 312 if (retval) { 313 scsi_autopm_put_device(sdp->device); 314 sdp_put: 315 scsi_device_put(sdp->device); 316 } 317 sg_put: 318 if (sdp) 319 sg_put_dev(sdp); 320 mutex_unlock(&sg_mutex); 321 return retval; 322 } 323 324 /* Following function was formerly called 'sg_close' */ 325 static int 326 sg_release(struct inode *inode, struct file *filp) 327 { 328 Sg_device *sdp; 329 Sg_fd *sfp; 330 331 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 332 return -ENXIO; 333 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 334 335 sfp->closed = 1; 336 337 sdp->exclude = 0; 338 wake_up_interruptible(&sdp->o_excl_wait); 339 340 scsi_autopm_put_device(sdp->device); 341 kref_put(&sfp->f_ref, sg_remove_sfp); 342 return 0; 343 } 344 345 static ssize_t 346 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 347 { 348 Sg_device *sdp; 349 Sg_fd *sfp; 350 Sg_request *srp; 351 int req_pack_id = -1; 352 sg_io_hdr_t *hp; 353 struct sg_header *old_hdr = NULL; 354 int retval = 0; 355 356 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 357 return -ENXIO; 358 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 359 sdp->disk->disk_name, (int) count)); 360 361 if (!access_ok(VERIFY_WRITE, buf, count)) 362 return -EFAULT; 363 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 364 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 365 if (!old_hdr) 366 return -ENOMEM; 367 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 368 retval = -EFAULT; 369 goto free_old_hdr; 370 } 371 if (old_hdr->reply_len < 0) { 372 if (count >= SZ_SG_IO_HDR) { 373 sg_io_hdr_t *new_hdr; 374 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 375 if (!new_hdr) { 376 retval = -ENOMEM; 377 goto free_old_hdr; 378 } 379 retval =__copy_from_user 380 (new_hdr, buf, SZ_SG_IO_HDR); 381 req_pack_id = new_hdr->pack_id; 382 kfree(new_hdr); 383 if (retval) { 384 retval = -EFAULT; 385 goto free_old_hdr; 386 } 387 } 388 } else 389 req_pack_id = old_hdr->pack_id; 390 } 391 srp = sg_get_rq_mark(sfp, req_pack_id); 392 if (!srp) { /* now wait on packet to arrive */ 393 if (sdp->detached) { 394 retval = -ENODEV; 395 goto free_old_hdr; 396 } 397 if (filp->f_flags & O_NONBLOCK) { 398 retval = -EAGAIN; 399 goto free_old_hdr; 400 } 401 while (1) { 402 retval = 0; /* following macro beats race condition */ 403 __wait_event_interruptible(sfp->read_wait, 404 (sdp->detached || 405 (srp = sg_get_rq_mark(sfp, req_pack_id))), 406 retval); 407 if (sdp->detached) { 408 retval = -ENODEV; 409 goto free_old_hdr; 410 } 411 if (0 == retval) 412 break; 413 414 /* -ERESTARTSYS as signal hit process */ 415 goto free_old_hdr; 416 } 417 } 418 if (srp->header.interface_id != '\0') { 419 retval = sg_new_read(sfp, buf, count, srp); 420 goto free_old_hdr; 421 } 422 423 hp = &srp->header; 424 if (old_hdr == NULL) { 425 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 426 if (! old_hdr) { 427 retval = -ENOMEM; 428 goto free_old_hdr; 429 } 430 } 431 memset(old_hdr, 0, SZ_SG_HEADER); 432 old_hdr->reply_len = (int) hp->timeout; 433 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 434 old_hdr->pack_id = hp->pack_id; 435 old_hdr->twelve_byte = 436 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 437 old_hdr->target_status = hp->masked_status; 438 old_hdr->host_status = hp->host_status; 439 old_hdr->driver_status = hp->driver_status; 440 if ((CHECK_CONDITION & hp->masked_status) || 441 (DRIVER_SENSE & hp->driver_status)) 442 memcpy(old_hdr->sense_buffer, srp->sense_b, 443 sizeof (old_hdr->sense_buffer)); 444 switch (hp->host_status) { 445 /* This setup of 'result' is for backward compatibility and is best 446 ignored by the user who should use target, host + driver status */ 447 case DID_OK: 448 case DID_PASSTHROUGH: 449 case DID_SOFT_ERROR: 450 old_hdr->result = 0; 451 break; 452 case DID_NO_CONNECT: 453 case DID_BUS_BUSY: 454 case DID_TIME_OUT: 455 old_hdr->result = EBUSY; 456 break; 457 case DID_BAD_TARGET: 458 case DID_ABORT: 459 case DID_PARITY: 460 case DID_RESET: 461 case DID_BAD_INTR: 462 old_hdr->result = EIO; 463 break; 464 case DID_ERROR: 465 old_hdr->result = (srp->sense_b[0] == 0 && 466 hp->masked_status == GOOD) ? 0 : EIO; 467 break; 468 default: 469 old_hdr->result = EIO; 470 break; 471 } 472 473 /* Now copy the result back to the user buffer. */ 474 if (count >= SZ_SG_HEADER) { 475 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 476 retval = -EFAULT; 477 goto free_old_hdr; 478 } 479 buf += SZ_SG_HEADER; 480 if (count > old_hdr->reply_len) 481 count = old_hdr->reply_len; 482 if (count > SZ_SG_HEADER) { 483 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 484 retval = -EFAULT; 485 goto free_old_hdr; 486 } 487 } 488 } else 489 count = (old_hdr->result == 0) ? 0 : -EIO; 490 sg_finish_rem_req(srp); 491 retval = count; 492 free_old_hdr: 493 kfree(old_hdr); 494 return retval; 495 } 496 497 static ssize_t 498 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 499 { 500 sg_io_hdr_t *hp = &srp->header; 501 int err = 0; 502 int len; 503 504 if (count < SZ_SG_IO_HDR) { 505 err = -EINVAL; 506 goto err_out; 507 } 508 hp->sb_len_wr = 0; 509 if ((hp->mx_sb_len > 0) && hp->sbp) { 510 if ((CHECK_CONDITION & hp->masked_status) || 511 (DRIVER_SENSE & hp->driver_status)) { 512 int sb_len = SCSI_SENSE_BUFFERSIZE; 513 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 514 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 515 len = (len > sb_len) ? sb_len : len; 516 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 517 err = -EFAULT; 518 goto err_out; 519 } 520 hp->sb_len_wr = len; 521 } 522 } 523 if (hp->masked_status || hp->host_status || hp->driver_status) 524 hp->info |= SG_INFO_CHECK; 525 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 526 err = -EFAULT; 527 goto err_out; 528 } 529 err_out: 530 err = sg_finish_rem_req(srp); 531 return (0 == err) ? count : err; 532 } 533 534 static ssize_t 535 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 536 { 537 int mxsize, cmd_size, k; 538 int input_size, blocking; 539 unsigned char opcode; 540 Sg_device *sdp; 541 Sg_fd *sfp; 542 Sg_request *srp; 543 struct sg_header old_hdr; 544 sg_io_hdr_t *hp; 545 unsigned char cmnd[MAX_COMMAND_SIZE]; 546 547 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 548 return -ENXIO; 549 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 550 sdp->disk->disk_name, (int) count)); 551 if (sdp->detached) 552 return -ENODEV; 553 if (!((filp->f_flags & O_NONBLOCK) || 554 scsi_block_when_processing_errors(sdp->device))) 555 return -ENXIO; 556 557 if (!access_ok(VERIFY_READ, buf, count)) 558 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 559 if (count < SZ_SG_HEADER) 560 return -EIO; 561 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 562 return -EFAULT; 563 blocking = !(filp->f_flags & O_NONBLOCK); 564 if (old_hdr.reply_len < 0) 565 return sg_new_write(sfp, filp, buf, count, 566 blocking, 0, 0, NULL); 567 if (count < (SZ_SG_HEADER + 6)) 568 return -EIO; /* The minimum scsi command length is 6 bytes. */ 569 570 if (!(srp = sg_add_request(sfp))) { 571 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 572 return -EDOM; 573 } 574 buf += SZ_SG_HEADER; 575 __get_user(opcode, buf); 576 if (sfp->next_cmd_len > 0) { 577 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 578 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 579 sfp->next_cmd_len = 0; 580 sg_remove_request(sfp, srp); 581 return -EIO; 582 } 583 cmd_size = sfp->next_cmd_len; 584 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 585 } else { 586 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 587 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 588 cmd_size = 12; 589 } 590 SCSI_LOG_TIMEOUT(4, printk( 591 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 592 /* Determine buffer size. */ 593 input_size = count - cmd_size; 594 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 595 mxsize -= SZ_SG_HEADER; 596 input_size -= SZ_SG_HEADER; 597 if (input_size < 0) { 598 sg_remove_request(sfp, srp); 599 return -EIO; /* User did not pass enough bytes for this command. */ 600 } 601 hp = &srp->header; 602 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 603 hp->cmd_len = (unsigned char) cmd_size; 604 hp->iovec_count = 0; 605 hp->mx_sb_len = 0; 606 if (input_size > 0) 607 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 608 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 609 else 610 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 611 hp->dxfer_len = mxsize; 612 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 613 hp->dxferp = (char __user *)buf + cmd_size; 614 else 615 hp->dxferp = NULL; 616 hp->sbp = NULL; 617 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 618 hp->flags = input_size; /* structure abuse ... */ 619 hp->pack_id = old_hdr.pack_id; 620 hp->usr_ptr = NULL; 621 if (__copy_from_user(cmnd, buf, cmd_size)) 622 return -EFAULT; 623 /* 624 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 625 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 626 * is a non-zero input_size, so emit a warning. 627 */ 628 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 629 static char cmd[TASK_COMM_LEN]; 630 if (strcmp(current->comm, cmd)) { 631 printk_ratelimited(KERN_WARNING 632 "sg_write: data in/out %d/%d bytes " 633 "for SCSI command 0x%x-- guessing " 634 "data in;\n program %s not setting " 635 "count and/or reply_len properly\n", 636 old_hdr.reply_len - (int)SZ_SG_HEADER, 637 input_size, (unsigned int) cmnd[0], 638 current->comm); 639 strcpy(cmd, current->comm); 640 } 641 } 642 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 643 return (k < 0) ? k : count; 644 } 645 646 static ssize_t 647 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 648 size_t count, int blocking, int read_only, int sg_io_owned, 649 Sg_request **o_srp) 650 { 651 int k; 652 Sg_request *srp; 653 sg_io_hdr_t *hp; 654 unsigned char cmnd[MAX_COMMAND_SIZE]; 655 int timeout; 656 unsigned long ul_timeout; 657 658 if (count < SZ_SG_IO_HDR) 659 return -EINVAL; 660 if (!access_ok(VERIFY_READ, buf, count)) 661 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 662 663 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 664 if (!(srp = sg_add_request(sfp))) { 665 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 666 return -EDOM; 667 } 668 srp->sg_io_owned = sg_io_owned; 669 hp = &srp->header; 670 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 671 sg_remove_request(sfp, srp); 672 return -EFAULT; 673 } 674 if (hp->interface_id != 'S') { 675 sg_remove_request(sfp, srp); 676 return -ENOSYS; 677 } 678 if (hp->flags & SG_FLAG_MMAP_IO) { 679 if (hp->dxfer_len > sfp->reserve.bufflen) { 680 sg_remove_request(sfp, srp); 681 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 682 } 683 if (hp->flags & SG_FLAG_DIRECT_IO) { 684 sg_remove_request(sfp, srp); 685 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 686 } 687 if (sg_res_in_use(sfp)) { 688 sg_remove_request(sfp, srp); 689 return -EBUSY; /* reserve buffer already being used */ 690 } 691 } 692 ul_timeout = msecs_to_jiffies(srp->header.timeout); 693 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 694 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 695 sg_remove_request(sfp, srp); 696 return -EMSGSIZE; 697 } 698 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 699 sg_remove_request(sfp, srp); 700 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 701 } 702 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 703 sg_remove_request(sfp, srp); 704 return -EFAULT; 705 } 706 if (read_only && sg_allow_access(file, cmnd)) { 707 sg_remove_request(sfp, srp); 708 return -EPERM; 709 } 710 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 711 if (k < 0) 712 return k; 713 if (o_srp) 714 *o_srp = srp; 715 return count; 716 } 717 718 static int 719 sg_common_write(Sg_fd * sfp, Sg_request * srp, 720 unsigned char *cmnd, int timeout, int blocking) 721 { 722 int k, data_dir; 723 Sg_device *sdp = sfp->parentdp; 724 sg_io_hdr_t *hp = &srp->header; 725 726 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 727 hp->status = 0; 728 hp->masked_status = 0; 729 hp->msg_status = 0; 730 hp->info = 0; 731 hp->host_status = 0; 732 hp->driver_status = 0; 733 hp->resid = 0; 734 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 735 (int) cmnd[0], (int) hp->cmd_len)); 736 737 k = sg_start_req(srp, cmnd); 738 if (k) { 739 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 740 sg_finish_rem_req(srp); 741 return k; /* probably out of space --> ENOMEM */ 742 } 743 if (sdp->detached) { 744 if (srp->bio) 745 blk_end_request_all(srp->rq, -EIO); 746 sg_finish_rem_req(srp); 747 return -ENODEV; 748 } 749 750 switch (hp->dxfer_direction) { 751 case SG_DXFER_TO_FROM_DEV: 752 case SG_DXFER_FROM_DEV: 753 data_dir = DMA_FROM_DEVICE; 754 break; 755 case SG_DXFER_TO_DEV: 756 data_dir = DMA_TO_DEVICE; 757 break; 758 case SG_DXFER_UNKNOWN: 759 data_dir = DMA_BIDIRECTIONAL; 760 break; 761 default: 762 data_dir = DMA_NONE; 763 break; 764 } 765 hp->duration = jiffies_to_msecs(jiffies); 766 767 srp->rq->timeout = timeout; 768 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 769 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 770 srp->rq, 1, sg_rq_end_io); 771 return 0; 772 } 773 774 static int 775 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 776 { 777 void __user *p = (void __user *)arg; 778 int __user *ip = p; 779 int result, val, read_only; 780 Sg_device *sdp; 781 Sg_fd *sfp; 782 Sg_request *srp; 783 unsigned long iflags; 784 785 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 786 return -ENXIO; 787 788 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 789 sdp->disk->disk_name, (int) cmd_in)); 790 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 791 792 switch (cmd_in) { 793 case SG_IO: 794 { 795 int blocking = 1; /* ignore O_NONBLOCK flag */ 796 797 if (sdp->detached) 798 return -ENODEV; 799 if (!scsi_block_when_processing_errors(sdp->device)) 800 return -ENXIO; 801 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 802 return -EFAULT; 803 result = 804 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 805 blocking, read_only, 1, &srp); 806 if (result < 0) 807 return result; 808 while (1) { 809 result = 0; /* following macro to beat race condition */ 810 __wait_event_interruptible(sfp->read_wait, 811 (srp->done || sdp->detached), 812 result); 813 if (sdp->detached) 814 return -ENODEV; 815 write_lock_irq(&sfp->rq_list_lock); 816 if (srp->done) { 817 srp->done = 2; 818 write_unlock_irq(&sfp->rq_list_lock); 819 break; 820 } 821 srp->orphan = 1; 822 write_unlock_irq(&sfp->rq_list_lock); 823 return result; /* -ERESTARTSYS because signal hit process */ 824 } 825 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 826 return (result < 0) ? result : 0; 827 } 828 case SG_SET_TIMEOUT: 829 result = get_user(val, ip); 830 if (result) 831 return result; 832 if (val < 0) 833 return -EIO; 834 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 835 val = MULDIV (INT_MAX, USER_HZ, HZ); 836 sfp->timeout_user = val; 837 sfp->timeout = MULDIV (val, HZ, USER_HZ); 838 839 return 0; 840 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 841 /* strange ..., for backward compatibility */ 842 return sfp->timeout_user; 843 case SG_SET_FORCE_LOW_DMA: 844 result = get_user(val, ip); 845 if (result) 846 return result; 847 if (val) { 848 sfp->low_dma = 1; 849 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 850 val = (int) sfp->reserve.bufflen; 851 sg_remove_scat(&sfp->reserve); 852 sg_build_reserve(sfp, val); 853 } 854 } else { 855 if (sdp->detached) 856 return -ENODEV; 857 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 858 } 859 return 0; 860 case SG_GET_LOW_DMA: 861 return put_user((int) sfp->low_dma, ip); 862 case SG_GET_SCSI_ID: 863 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 864 return -EFAULT; 865 else { 866 sg_scsi_id_t __user *sg_idp = p; 867 868 if (sdp->detached) 869 return -ENODEV; 870 __put_user((int) sdp->device->host->host_no, 871 &sg_idp->host_no); 872 __put_user((int) sdp->device->channel, 873 &sg_idp->channel); 874 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 875 __put_user((int) sdp->device->lun, &sg_idp->lun); 876 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 877 __put_user((short) sdp->device->host->cmd_per_lun, 878 &sg_idp->h_cmd_per_lun); 879 __put_user((short) sdp->device->queue_depth, 880 &sg_idp->d_queue_depth); 881 __put_user(0, &sg_idp->unused[0]); 882 __put_user(0, &sg_idp->unused[1]); 883 return 0; 884 } 885 case SG_SET_FORCE_PACK_ID: 886 result = get_user(val, ip); 887 if (result) 888 return result; 889 sfp->force_packid = val ? 1 : 0; 890 return 0; 891 case SG_GET_PACK_ID: 892 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 893 return -EFAULT; 894 read_lock_irqsave(&sfp->rq_list_lock, iflags); 895 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 896 if ((1 == srp->done) && (!srp->sg_io_owned)) { 897 read_unlock_irqrestore(&sfp->rq_list_lock, 898 iflags); 899 __put_user(srp->header.pack_id, ip); 900 return 0; 901 } 902 } 903 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 904 __put_user(-1, ip); 905 return 0; 906 case SG_GET_NUM_WAITING: 907 read_lock_irqsave(&sfp->rq_list_lock, iflags); 908 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 909 if ((1 == srp->done) && (!srp->sg_io_owned)) 910 ++val; 911 } 912 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 913 return put_user(val, ip); 914 case SG_GET_SG_TABLESIZE: 915 return put_user(sdp->sg_tablesize, ip); 916 case SG_SET_RESERVED_SIZE: 917 result = get_user(val, ip); 918 if (result) 919 return result; 920 if (val < 0) 921 return -EINVAL; 922 val = min_t(int, val, 923 queue_max_sectors(sdp->device->request_queue) * 512); 924 if (val != sfp->reserve.bufflen) { 925 if (sg_res_in_use(sfp) || sfp->mmap_called) 926 return -EBUSY; 927 sg_remove_scat(&sfp->reserve); 928 sg_build_reserve(sfp, val); 929 } 930 return 0; 931 case SG_GET_RESERVED_SIZE: 932 val = min_t(int, sfp->reserve.bufflen, 933 queue_max_sectors(sdp->device->request_queue) * 512); 934 return put_user(val, ip); 935 case SG_SET_COMMAND_Q: 936 result = get_user(val, ip); 937 if (result) 938 return result; 939 sfp->cmd_q = val ? 1 : 0; 940 return 0; 941 case SG_GET_COMMAND_Q: 942 return put_user((int) sfp->cmd_q, ip); 943 case SG_SET_KEEP_ORPHAN: 944 result = get_user(val, ip); 945 if (result) 946 return result; 947 sfp->keep_orphan = val; 948 return 0; 949 case SG_GET_KEEP_ORPHAN: 950 return put_user((int) sfp->keep_orphan, ip); 951 case SG_NEXT_CMD_LEN: 952 result = get_user(val, ip); 953 if (result) 954 return result; 955 sfp->next_cmd_len = (val > 0) ? val : 0; 956 return 0; 957 case SG_GET_VERSION_NUM: 958 return put_user(sg_version_num, ip); 959 case SG_GET_ACCESS_COUNT: 960 /* faked - we don't have a real access count anymore */ 961 val = (sdp->device ? 1 : 0); 962 return put_user(val, ip); 963 case SG_GET_REQUEST_TABLE: 964 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 965 return -EFAULT; 966 else { 967 sg_req_info_t *rinfo; 968 unsigned int ms; 969 970 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 971 GFP_KERNEL); 972 if (!rinfo) 973 return -ENOMEM; 974 read_lock_irqsave(&sfp->rq_list_lock, iflags); 975 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 976 ++val, srp = srp ? srp->nextrp : srp) { 977 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 978 if (srp) { 979 rinfo[val].req_state = srp->done + 1; 980 rinfo[val].problem = 981 srp->header.masked_status & 982 srp->header.host_status & 983 srp->header.driver_status; 984 if (srp->done) 985 rinfo[val].duration = 986 srp->header.duration; 987 else { 988 ms = jiffies_to_msecs(jiffies); 989 rinfo[val].duration = 990 (ms > srp->header.duration) ? 991 (ms - srp->header.duration) : 0; 992 } 993 rinfo[val].orphan = srp->orphan; 994 rinfo[val].sg_io_owned = 995 srp->sg_io_owned; 996 rinfo[val].pack_id = 997 srp->header.pack_id; 998 rinfo[val].usr_ptr = 999 srp->header.usr_ptr; 1000 } 1001 } 1002 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1003 result = __copy_to_user(p, rinfo, 1004 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1005 result = result ? -EFAULT : 0; 1006 kfree(rinfo); 1007 return result; 1008 } 1009 case SG_EMULATED_HOST: 1010 if (sdp->detached) 1011 return -ENODEV; 1012 return put_user(sdp->device->host->hostt->emulated, ip); 1013 case SG_SCSI_RESET: 1014 if (sdp->detached) 1015 return -ENODEV; 1016 if (filp->f_flags & O_NONBLOCK) { 1017 if (scsi_host_in_recovery(sdp->device->host)) 1018 return -EBUSY; 1019 } else if (!scsi_block_when_processing_errors(sdp->device)) 1020 return -EBUSY; 1021 result = get_user(val, ip); 1022 if (result) 1023 return result; 1024 if (SG_SCSI_RESET_NOTHING == val) 1025 return 0; 1026 switch (val) { 1027 case SG_SCSI_RESET_DEVICE: 1028 val = SCSI_TRY_RESET_DEVICE; 1029 break; 1030 case SG_SCSI_RESET_TARGET: 1031 val = SCSI_TRY_RESET_TARGET; 1032 break; 1033 case SG_SCSI_RESET_BUS: 1034 val = SCSI_TRY_RESET_BUS; 1035 break; 1036 case SG_SCSI_RESET_HOST: 1037 val = SCSI_TRY_RESET_HOST; 1038 break; 1039 default: 1040 return -EINVAL; 1041 } 1042 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1043 return -EACCES; 1044 return (scsi_reset_provider(sdp->device, val) == 1045 SUCCESS) ? 0 : -EIO; 1046 case SCSI_IOCTL_SEND_COMMAND: 1047 if (sdp->detached) 1048 return -ENODEV; 1049 if (read_only) { 1050 unsigned char opcode = WRITE_6; 1051 Scsi_Ioctl_Command __user *siocp = p; 1052 1053 if (copy_from_user(&opcode, siocp->data, 1)) 1054 return -EFAULT; 1055 if (sg_allow_access(filp, &opcode)) 1056 return -EPERM; 1057 } 1058 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1059 case SG_SET_DEBUG: 1060 result = get_user(val, ip); 1061 if (result) 1062 return result; 1063 sdp->sgdebug = (char) val; 1064 return 0; 1065 case SCSI_IOCTL_GET_IDLUN: 1066 case SCSI_IOCTL_GET_BUS_NUMBER: 1067 case SCSI_IOCTL_PROBE_HOST: 1068 case SG_GET_TRANSFORM: 1069 if (sdp->detached) 1070 return -ENODEV; 1071 return scsi_ioctl(sdp->device, cmd_in, p); 1072 case BLKSECTGET: 1073 return put_user(queue_max_sectors(sdp->device->request_queue) * 512, 1074 ip); 1075 case BLKTRACESETUP: 1076 return blk_trace_setup(sdp->device->request_queue, 1077 sdp->disk->disk_name, 1078 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1079 NULL, 1080 (char *)arg); 1081 case BLKTRACESTART: 1082 return blk_trace_startstop(sdp->device->request_queue, 1); 1083 case BLKTRACESTOP: 1084 return blk_trace_startstop(sdp->device->request_queue, 0); 1085 case BLKTRACETEARDOWN: 1086 return blk_trace_remove(sdp->device->request_queue); 1087 default: 1088 if (read_only) 1089 return -EPERM; /* don't know so take safe approach */ 1090 return scsi_ioctl(sdp->device, cmd_in, p); 1091 } 1092 } 1093 1094 static long 1095 sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1096 { 1097 int ret; 1098 1099 mutex_lock(&sg_mutex); 1100 ret = sg_ioctl(filp, cmd_in, arg); 1101 mutex_unlock(&sg_mutex); 1102 1103 return ret; 1104 } 1105 1106 #ifdef CONFIG_COMPAT 1107 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1108 { 1109 Sg_device *sdp; 1110 Sg_fd *sfp; 1111 struct scsi_device *sdev; 1112 1113 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1114 return -ENXIO; 1115 1116 sdev = sdp->device; 1117 if (sdev->host->hostt->compat_ioctl) { 1118 int ret; 1119 1120 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1121 1122 return ret; 1123 } 1124 1125 return -ENOIOCTLCMD; 1126 } 1127 #endif 1128 1129 static unsigned int 1130 sg_poll(struct file *filp, poll_table * wait) 1131 { 1132 unsigned int res = 0; 1133 Sg_device *sdp; 1134 Sg_fd *sfp; 1135 Sg_request *srp; 1136 int count = 0; 1137 unsigned long iflags; 1138 1139 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1140 || sfp->closed) 1141 return POLLERR; 1142 poll_wait(filp, &sfp->read_wait, wait); 1143 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1144 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1145 /* if any read waiting, flag it */ 1146 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1147 res = POLLIN | POLLRDNORM; 1148 ++count; 1149 } 1150 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1151 1152 if (sdp->detached) 1153 res |= POLLHUP; 1154 else if (!sfp->cmd_q) { 1155 if (0 == count) 1156 res |= POLLOUT | POLLWRNORM; 1157 } else if (count < SG_MAX_QUEUE) 1158 res |= POLLOUT | POLLWRNORM; 1159 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1160 sdp->disk->disk_name, (int) res)); 1161 return res; 1162 } 1163 1164 static int 1165 sg_fasync(int fd, struct file *filp, int mode) 1166 { 1167 Sg_device *sdp; 1168 Sg_fd *sfp; 1169 1170 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1171 return -ENXIO; 1172 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1173 sdp->disk->disk_name, mode)); 1174 1175 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1176 } 1177 1178 static int 1179 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1180 { 1181 Sg_fd *sfp; 1182 unsigned long offset, len, sa; 1183 Sg_scatter_hold *rsv_schp; 1184 int k, length; 1185 1186 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1187 return VM_FAULT_SIGBUS; 1188 rsv_schp = &sfp->reserve; 1189 offset = vmf->pgoff << PAGE_SHIFT; 1190 if (offset >= rsv_schp->bufflen) 1191 return VM_FAULT_SIGBUS; 1192 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1193 offset, rsv_schp->k_use_sg)); 1194 sa = vma->vm_start; 1195 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1196 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1197 len = vma->vm_end - sa; 1198 len = (len < length) ? len : length; 1199 if (offset < len) { 1200 struct page *page = nth_page(rsv_schp->pages[k], 1201 offset >> PAGE_SHIFT); 1202 get_page(page); /* increment page count */ 1203 vmf->page = page; 1204 return 0; /* success */ 1205 } 1206 sa += len; 1207 offset -= len; 1208 } 1209 1210 return VM_FAULT_SIGBUS; 1211 } 1212 1213 static const struct vm_operations_struct sg_mmap_vm_ops = { 1214 .fault = sg_vma_fault, 1215 }; 1216 1217 static int 1218 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1219 { 1220 Sg_fd *sfp; 1221 unsigned long req_sz, len, sa; 1222 Sg_scatter_hold *rsv_schp; 1223 int k, length; 1224 1225 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1226 return -ENXIO; 1227 req_sz = vma->vm_end - vma->vm_start; 1228 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1229 (void *) vma->vm_start, (int) req_sz)); 1230 if (vma->vm_pgoff) 1231 return -EINVAL; /* want no offset */ 1232 rsv_schp = &sfp->reserve; 1233 if (req_sz > rsv_schp->bufflen) 1234 return -ENOMEM; /* cannot map more than reserved buffer */ 1235 1236 sa = vma->vm_start; 1237 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1238 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1239 len = vma->vm_end - sa; 1240 len = (len < length) ? len : length; 1241 sa += len; 1242 } 1243 1244 sfp->mmap_called = 1; 1245 vma->vm_flags |= VM_RESERVED; 1246 vma->vm_private_data = sfp; 1247 vma->vm_ops = &sg_mmap_vm_ops; 1248 return 0; 1249 } 1250 1251 static void sg_rq_end_io_usercontext(struct work_struct *work) 1252 { 1253 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1254 struct sg_fd *sfp = srp->parentfp; 1255 1256 sg_finish_rem_req(srp); 1257 kref_put(&sfp->f_ref, sg_remove_sfp); 1258 } 1259 1260 /* 1261 * This function is a "bottom half" handler that is called by the mid 1262 * level when a command is completed (or has failed). 1263 */ 1264 static void sg_rq_end_io(struct request *rq, int uptodate) 1265 { 1266 struct sg_request *srp = rq->end_io_data; 1267 Sg_device *sdp; 1268 Sg_fd *sfp; 1269 unsigned long iflags; 1270 unsigned int ms; 1271 char *sense; 1272 int result, resid, done = 1; 1273 1274 if (WARN_ON(srp->done != 0)) 1275 return; 1276 1277 sfp = srp->parentfp; 1278 if (WARN_ON(sfp == NULL)) 1279 return; 1280 1281 sdp = sfp->parentdp; 1282 if (unlikely(sdp->detached)) 1283 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1284 1285 sense = rq->sense; 1286 result = rq->errors; 1287 resid = rq->resid_len; 1288 1289 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1290 sdp->disk->disk_name, srp->header.pack_id, result)); 1291 srp->header.resid = resid; 1292 ms = jiffies_to_msecs(jiffies); 1293 srp->header.duration = (ms > srp->header.duration) ? 1294 (ms - srp->header.duration) : 0; 1295 if (0 != result) { 1296 struct scsi_sense_hdr sshdr; 1297 1298 srp->header.status = 0xff & result; 1299 srp->header.masked_status = status_byte(result); 1300 srp->header.msg_status = msg_byte(result); 1301 srp->header.host_status = host_byte(result); 1302 srp->header.driver_status = driver_byte(result); 1303 if ((sdp->sgdebug > 0) && 1304 ((CHECK_CONDITION == srp->header.masked_status) || 1305 (COMMAND_TERMINATED == srp->header.masked_status))) 1306 __scsi_print_sense("sg_cmd_done", sense, 1307 SCSI_SENSE_BUFFERSIZE); 1308 1309 /* Following if statement is a patch supplied by Eric Youngdale */ 1310 if (driver_byte(result) != 0 1311 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1312 && !scsi_sense_is_deferred(&sshdr) 1313 && sshdr.sense_key == UNIT_ATTENTION 1314 && sdp->device->removable) { 1315 /* Detected possible disc change. Set the bit - this */ 1316 /* may be used if there are filesystems using this device */ 1317 sdp->device->changed = 1; 1318 } 1319 } 1320 /* Rely on write phase to clean out srp status values, so no "else" */ 1321 1322 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1323 if (unlikely(srp->orphan)) { 1324 if (sfp->keep_orphan) 1325 srp->sg_io_owned = 0; 1326 else 1327 done = 0; 1328 } 1329 srp->done = done; 1330 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1331 1332 if (likely(done)) { 1333 /* Now wake up any sg_read() that is waiting for this 1334 * packet. 1335 */ 1336 wake_up_interruptible(&sfp->read_wait); 1337 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1338 kref_put(&sfp->f_ref, sg_remove_sfp); 1339 } else { 1340 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1341 schedule_work(&srp->ew.work); 1342 } 1343 } 1344 1345 static const struct file_operations sg_fops = { 1346 .owner = THIS_MODULE, 1347 .read = sg_read, 1348 .write = sg_write, 1349 .poll = sg_poll, 1350 .unlocked_ioctl = sg_unlocked_ioctl, 1351 #ifdef CONFIG_COMPAT 1352 .compat_ioctl = sg_compat_ioctl, 1353 #endif 1354 .open = sg_open, 1355 .mmap = sg_mmap, 1356 .release = sg_release, 1357 .fasync = sg_fasync, 1358 .llseek = no_llseek, 1359 }; 1360 1361 static struct class *sg_sysfs_class; 1362 1363 static int sg_sysfs_valid = 0; 1364 1365 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1366 { 1367 struct request_queue *q = scsidp->request_queue; 1368 Sg_device *sdp; 1369 unsigned long iflags; 1370 int error; 1371 u32 k; 1372 1373 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1374 if (!sdp) { 1375 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1376 return ERR_PTR(-ENOMEM); 1377 } 1378 1379 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1380 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1381 error = -ENOMEM; 1382 goto out; 1383 } 1384 1385 write_lock_irqsave(&sg_index_lock, iflags); 1386 1387 error = idr_get_new(&sg_index_idr, sdp, &k); 1388 if (error) { 1389 write_unlock_irqrestore(&sg_index_lock, iflags); 1390 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1391 error); 1392 goto out; 1393 } 1394 1395 if (unlikely(k >= SG_MAX_DEVS)) 1396 goto overflow; 1397 1398 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1399 sprintf(disk->disk_name, "sg%d", k); 1400 disk->first_minor = k; 1401 sdp->disk = disk; 1402 sdp->device = scsidp; 1403 INIT_LIST_HEAD(&sdp->sfds); 1404 init_waitqueue_head(&sdp->o_excl_wait); 1405 sdp->sg_tablesize = queue_max_segments(q); 1406 sdp->index = k; 1407 kref_init(&sdp->d_ref); 1408 1409 write_unlock_irqrestore(&sg_index_lock, iflags); 1410 1411 error = 0; 1412 out: 1413 if (error) { 1414 kfree(sdp); 1415 return ERR_PTR(error); 1416 } 1417 return sdp; 1418 1419 overflow: 1420 idr_remove(&sg_index_idr, k); 1421 write_unlock_irqrestore(&sg_index_lock, iflags); 1422 sdev_printk(KERN_WARNING, scsidp, 1423 "Unable to attach sg device type=%d, minor " 1424 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1425 error = -ENODEV; 1426 goto out; 1427 } 1428 1429 static int 1430 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1431 { 1432 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1433 struct gendisk *disk; 1434 Sg_device *sdp = NULL; 1435 struct cdev * cdev = NULL; 1436 int error; 1437 unsigned long iflags; 1438 1439 disk = alloc_disk(1); 1440 if (!disk) { 1441 printk(KERN_WARNING "alloc_disk failed\n"); 1442 return -ENOMEM; 1443 } 1444 disk->major = SCSI_GENERIC_MAJOR; 1445 1446 error = -ENOMEM; 1447 cdev = cdev_alloc(); 1448 if (!cdev) { 1449 printk(KERN_WARNING "cdev_alloc failed\n"); 1450 goto out; 1451 } 1452 cdev->owner = THIS_MODULE; 1453 cdev->ops = &sg_fops; 1454 1455 sdp = sg_alloc(disk, scsidp); 1456 if (IS_ERR(sdp)) { 1457 printk(KERN_WARNING "sg_alloc failed\n"); 1458 error = PTR_ERR(sdp); 1459 goto out; 1460 } 1461 1462 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1463 if (error) 1464 goto cdev_add_err; 1465 1466 sdp->cdev = cdev; 1467 if (sg_sysfs_valid) { 1468 struct device *sg_class_member; 1469 1470 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1471 MKDEV(SCSI_GENERIC_MAJOR, 1472 sdp->index), 1473 sdp, "%s", disk->disk_name); 1474 if (IS_ERR(sg_class_member)) { 1475 printk(KERN_ERR "sg_add: " 1476 "device_create failed\n"); 1477 error = PTR_ERR(sg_class_member); 1478 goto cdev_add_err; 1479 } 1480 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1481 &sg_class_member->kobj, "generic"); 1482 if (error) 1483 printk(KERN_ERR "sg_add: unable to make symlink " 1484 "'generic' back to sg%d\n", sdp->index); 1485 } else 1486 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1487 1488 sdev_printk(KERN_NOTICE, scsidp, 1489 "Attached scsi generic sg%d type %d\n", sdp->index, 1490 scsidp->type); 1491 1492 dev_set_drvdata(cl_dev, sdp); 1493 1494 return 0; 1495 1496 cdev_add_err: 1497 write_lock_irqsave(&sg_index_lock, iflags); 1498 idr_remove(&sg_index_idr, sdp->index); 1499 write_unlock_irqrestore(&sg_index_lock, iflags); 1500 kfree(sdp); 1501 1502 out: 1503 put_disk(disk); 1504 if (cdev) 1505 cdev_del(cdev); 1506 return error; 1507 } 1508 1509 static void sg_device_destroy(struct kref *kref) 1510 { 1511 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1512 unsigned long flags; 1513 1514 /* CAUTION! Note that the device can still be found via idr_find() 1515 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1516 * any other cleanup. 1517 */ 1518 1519 write_lock_irqsave(&sg_index_lock, flags); 1520 idr_remove(&sg_index_idr, sdp->index); 1521 write_unlock_irqrestore(&sg_index_lock, flags); 1522 1523 SCSI_LOG_TIMEOUT(3, 1524 printk("sg_device_destroy: %s\n", 1525 sdp->disk->disk_name)); 1526 1527 put_disk(sdp->disk); 1528 kfree(sdp); 1529 } 1530 1531 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1532 { 1533 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1534 Sg_device *sdp = dev_get_drvdata(cl_dev); 1535 unsigned long iflags; 1536 Sg_fd *sfp; 1537 1538 if (!sdp || sdp->detached) 1539 return; 1540 1541 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1542 1543 /* Need a write lock to set sdp->detached. */ 1544 write_lock_irqsave(&sg_index_lock, iflags); 1545 sdp->detached = 1; 1546 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1547 wake_up_interruptible(&sfp->read_wait); 1548 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1549 } 1550 write_unlock_irqrestore(&sg_index_lock, iflags); 1551 1552 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1553 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1554 cdev_del(sdp->cdev); 1555 sdp->cdev = NULL; 1556 1557 sg_put_dev(sdp); 1558 } 1559 1560 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1561 module_param_named(def_reserved_size, def_reserved_size, int, 1562 S_IRUGO | S_IWUSR); 1563 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1564 1565 MODULE_AUTHOR("Douglas Gilbert"); 1566 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1567 MODULE_LICENSE("GPL"); 1568 MODULE_VERSION(SG_VERSION_STR); 1569 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1570 1571 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1572 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1573 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1574 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1575 1576 static int __init 1577 init_sg(void) 1578 { 1579 int rc; 1580 1581 if (scatter_elem_sz < PAGE_SIZE) { 1582 scatter_elem_sz = PAGE_SIZE; 1583 scatter_elem_sz_prev = scatter_elem_sz; 1584 } 1585 if (def_reserved_size >= 0) 1586 sg_big_buff = def_reserved_size; 1587 else 1588 def_reserved_size = sg_big_buff; 1589 1590 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1591 SG_MAX_DEVS, "sg"); 1592 if (rc) 1593 return rc; 1594 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1595 if ( IS_ERR(sg_sysfs_class) ) { 1596 rc = PTR_ERR(sg_sysfs_class); 1597 goto err_out; 1598 } 1599 sg_sysfs_valid = 1; 1600 rc = scsi_register_interface(&sg_interface); 1601 if (0 == rc) { 1602 #ifdef CONFIG_SCSI_PROC_FS 1603 sg_proc_init(); 1604 #endif /* CONFIG_SCSI_PROC_FS */ 1605 return 0; 1606 } 1607 class_destroy(sg_sysfs_class); 1608 err_out: 1609 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1610 return rc; 1611 } 1612 1613 static void __exit 1614 exit_sg(void) 1615 { 1616 #ifdef CONFIG_SCSI_PROC_FS 1617 sg_proc_cleanup(); 1618 #endif /* CONFIG_SCSI_PROC_FS */ 1619 scsi_unregister_interface(&sg_interface); 1620 class_destroy(sg_sysfs_class); 1621 sg_sysfs_valid = 0; 1622 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1623 SG_MAX_DEVS); 1624 idr_destroy(&sg_index_idr); 1625 } 1626 1627 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1628 { 1629 int res; 1630 struct request *rq; 1631 Sg_fd *sfp = srp->parentfp; 1632 sg_io_hdr_t *hp = &srp->header; 1633 int dxfer_len = (int) hp->dxfer_len; 1634 int dxfer_dir = hp->dxfer_direction; 1635 unsigned int iov_count = hp->iovec_count; 1636 Sg_scatter_hold *req_schp = &srp->data; 1637 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1638 struct request_queue *q = sfp->parentdp->device->request_queue; 1639 struct rq_map_data *md, map_data; 1640 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1641 1642 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1643 dxfer_len)); 1644 1645 rq = blk_get_request(q, rw, GFP_ATOMIC); 1646 if (!rq) 1647 return -ENOMEM; 1648 1649 memcpy(rq->cmd, cmd, hp->cmd_len); 1650 1651 rq->cmd_len = hp->cmd_len; 1652 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1653 1654 srp->rq = rq; 1655 rq->end_io_data = srp; 1656 rq->sense = srp->sense_b; 1657 rq->retries = SG_DEFAULT_RETRIES; 1658 1659 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1660 return 0; 1661 1662 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1663 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1664 !sfp->parentdp->device->host->unchecked_isa_dma && 1665 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1666 md = NULL; 1667 else 1668 md = &map_data; 1669 1670 if (md) { 1671 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1672 sg_link_reserve(sfp, srp, dxfer_len); 1673 else { 1674 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1675 if (res) 1676 return res; 1677 } 1678 1679 md->pages = req_schp->pages; 1680 md->page_order = req_schp->page_order; 1681 md->nr_entries = req_schp->k_use_sg; 1682 md->offset = 0; 1683 md->null_mapped = hp->dxferp ? 0 : 1; 1684 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1685 md->from_user = 1; 1686 else 1687 md->from_user = 0; 1688 } 1689 1690 if (iov_count) { 1691 int len, size = sizeof(struct sg_iovec) * iov_count; 1692 struct iovec *iov; 1693 1694 iov = memdup_user(hp->dxferp, size); 1695 if (IS_ERR(iov)) 1696 return PTR_ERR(iov); 1697 1698 len = iov_length(iov, iov_count); 1699 if (hp->dxfer_len < len) { 1700 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1701 len = hp->dxfer_len; 1702 } 1703 1704 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1705 iov_count, 1706 len, GFP_ATOMIC); 1707 kfree(iov); 1708 } else 1709 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1710 hp->dxfer_len, GFP_ATOMIC); 1711 1712 if (!res) { 1713 srp->bio = rq->bio; 1714 1715 if (!md) { 1716 req_schp->dio_in_use = 1; 1717 hp->info |= SG_INFO_DIRECT_IO; 1718 } 1719 } 1720 return res; 1721 } 1722 1723 static int sg_finish_rem_req(Sg_request * srp) 1724 { 1725 int ret = 0; 1726 1727 Sg_fd *sfp = srp->parentfp; 1728 Sg_scatter_hold *req_schp = &srp->data; 1729 1730 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1731 if (srp->rq) { 1732 if (srp->bio) 1733 ret = blk_rq_unmap_user(srp->bio); 1734 1735 blk_put_request(srp->rq); 1736 } 1737 1738 if (srp->res_used) 1739 sg_unlink_reserve(sfp, srp); 1740 else 1741 sg_remove_scat(req_schp); 1742 1743 sg_remove_request(sfp, srp); 1744 1745 return ret; 1746 } 1747 1748 static int 1749 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1750 { 1751 int sg_bufflen = tablesize * sizeof(struct page *); 1752 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1753 1754 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1755 if (!schp->pages) 1756 return -ENOMEM; 1757 schp->sglist_len = sg_bufflen; 1758 return tablesize; /* number of scat_gath elements allocated */ 1759 } 1760 1761 static int 1762 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1763 { 1764 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1765 int sg_tablesize = sfp->parentdp->sg_tablesize; 1766 int blk_size = buff_size, order; 1767 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1768 1769 if (blk_size < 0) 1770 return -EFAULT; 1771 if (0 == blk_size) 1772 ++blk_size; /* don't know why */ 1773 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1774 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1775 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1776 buff_size, blk_size)); 1777 1778 /* N.B. ret_sz carried into this block ... */ 1779 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1780 if (mx_sc_elems < 0) 1781 return mx_sc_elems; /* most likely -ENOMEM */ 1782 1783 num = scatter_elem_sz; 1784 if (unlikely(num != scatter_elem_sz_prev)) { 1785 if (num < PAGE_SIZE) { 1786 scatter_elem_sz = PAGE_SIZE; 1787 scatter_elem_sz_prev = PAGE_SIZE; 1788 } else 1789 scatter_elem_sz_prev = num; 1790 } 1791 1792 if (sfp->low_dma) 1793 gfp_mask |= GFP_DMA; 1794 1795 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1796 gfp_mask |= __GFP_ZERO; 1797 1798 order = get_order(num); 1799 retry: 1800 ret_sz = 1 << (PAGE_SHIFT + order); 1801 1802 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1803 k++, rem_sz -= ret_sz) { 1804 1805 num = (rem_sz > scatter_elem_sz_prev) ? 1806 scatter_elem_sz_prev : rem_sz; 1807 1808 schp->pages[k] = alloc_pages(gfp_mask, order); 1809 if (!schp->pages[k]) 1810 goto out; 1811 1812 if (num == scatter_elem_sz_prev) { 1813 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1814 scatter_elem_sz = ret_sz; 1815 scatter_elem_sz_prev = ret_sz; 1816 } 1817 } 1818 1819 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1820 "ret_sz=%d\n", k, num, ret_sz)); 1821 } /* end of for loop */ 1822 1823 schp->page_order = order; 1824 schp->k_use_sg = k; 1825 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1826 "rem_sz=%d\n", k, rem_sz)); 1827 1828 schp->bufflen = blk_size; 1829 if (rem_sz > 0) /* must have failed */ 1830 return -ENOMEM; 1831 return 0; 1832 out: 1833 for (i = 0; i < k; i++) 1834 __free_pages(schp->pages[i], order); 1835 1836 if (--order >= 0) 1837 goto retry; 1838 1839 return -ENOMEM; 1840 } 1841 1842 static void 1843 sg_remove_scat(Sg_scatter_hold * schp) 1844 { 1845 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1846 if (schp->pages && schp->sglist_len > 0) { 1847 if (!schp->dio_in_use) { 1848 int k; 1849 1850 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1851 SCSI_LOG_TIMEOUT(5, printk( 1852 "sg_remove_scat: k=%d, pg=0x%p\n", 1853 k, schp->pages[k])); 1854 __free_pages(schp->pages[k], schp->page_order); 1855 } 1856 1857 kfree(schp->pages); 1858 } 1859 } 1860 memset(schp, 0, sizeof (*schp)); 1861 } 1862 1863 static int 1864 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1865 { 1866 Sg_scatter_hold *schp = &srp->data; 1867 int k, num; 1868 1869 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1870 num_read_xfer)); 1871 if ((!outp) || (num_read_xfer <= 0)) 1872 return 0; 1873 1874 num = 1 << (PAGE_SHIFT + schp->page_order); 1875 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1876 if (num > num_read_xfer) { 1877 if (__copy_to_user(outp, page_address(schp->pages[k]), 1878 num_read_xfer)) 1879 return -EFAULT; 1880 break; 1881 } else { 1882 if (__copy_to_user(outp, page_address(schp->pages[k]), 1883 num)) 1884 return -EFAULT; 1885 num_read_xfer -= num; 1886 if (num_read_xfer <= 0) 1887 break; 1888 outp += num; 1889 } 1890 } 1891 1892 return 0; 1893 } 1894 1895 static void 1896 sg_build_reserve(Sg_fd * sfp, int req_size) 1897 { 1898 Sg_scatter_hold *schp = &sfp->reserve; 1899 1900 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1901 do { 1902 if (req_size < PAGE_SIZE) 1903 req_size = PAGE_SIZE; 1904 if (0 == sg_build_indirect(schp, sfp, req_size)) 1905 return; 1906 else 1907 sg_remove_scat(schp); 1908 req_size >>= 1; /* divide by 2 */ 1909 } while (req_size > (PAGE_SIZE / 2)); 1910 } 1911 1912 static void 1913 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1914 { 1915 Sg_scatter_hold *req_schp = &srp->data; 1916 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1917 int k, num, rem; 1918 1919 srp->res_used = 1; 1920 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1921 rem = size; 1922 1923 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1924 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1925 if (rem <= num) { 1926 req_schp->k_use_sg = k + 1; 1927 req_schp->sglist_len = rsv_schp->sglist_len; 1928 req_schp->pages = rsv_schp->pages; 1929 1930 req_schp->bufflen = size; 1931 req_schp->page_order = rsv_schp->page_order; 1932 break; 1933 } else 1934 rem -= num; 1935 } 1936 1937 if (k >= rsv_schp->k_use_sg) 1938 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1939 } 1940 1941 static void 1942 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1943 { 1944 Sg_scatter_hold *req_schp = &srp->data; 1945 1946 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1947 (int) req_schp->k_use_sg)); 1948 req_schp->k_use_sg = 0; 1949 req_schp->bufflen = 0; 1950 req_schp->pages = NULL; 1951 req_schp->page_order = 0; 1952 req_schp->sglist_len = 0; 1953 sfp->save_scat_len = 0; 1954 srp->res_used = 0; 1955 } 1956 1957 static Sg_request * 1958 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1959 { 1960 Sg_request *resp; 1961 unsigned long iflags; 1962 1963 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1964 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1965 /* look for requests that are ready + not SG_IO owned */ 1966 if ((1 == resp->done) && (!resp->sg_io_owned) && 1967 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1968 resp->done = 2; /* guard against other readers */ 1969 break; 1970 } 1971 } 1972 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1973 return resp; 1974 } 1975 1976 /* always adds to end of list */ 1977 static Sg_request * 1978 sg_add_request(Sg_fd * sfp) 1979 { 1980 int k; 1981 unsigned long iflags; 1982 Sg_request *resp; 1983 Sg_request *rp = sfp->req_arr; 1984 1985 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1986 resp = sfp->headrp; 1987 if (!resp) { 1988 memset(rp, 0, sizeof (Sg_request)); 1989 rp->parentfp = sfp; 1990 resp = rp; 1991 sfp->headrp = resp; 1992 } else { 1993 if (0 == sfp->cmd_q) 1994 resp = NULL; /* command queuing disallowed */ 1995 else { 1996 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 1997 if (!rp->parentfp) 1998 break; 1999 } 2000 if (k < SG_MAX_QUEUE) { 2001 memset(rp, 0, sizeof (Sg_request)); 2002 rp->parentfp = sfp; 2003 while (resp->nextrp) 2004 resp = resp->nextrp; 2005 resp->nextrp = rp; 2006 resp = rp; 2007 } else 2008 resp = NULL; 2009 } 2010 } 2011 if (resp) { 2012 resp->nextrp = NULL; 2013 resp->header.duration = jiffies_to_msecs(jiffies); 2014 } 2015 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2016 return resp; 2017 } 2018 2019 /* Return of 1 for found; 0 for not found */ 2020 static int 2021 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2022 { 2023 Sg_request *prev_rp; 2024 Sg_request *rp; 2025 unsigned long iflags; 2026 int res = 0; 2027 2028 if ((!sfp) || (!srp) || (!sfp->headrp)) 2029 return res; 2030 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2031 prev_rp = sfp->headrp; 2032 if (srp == prev_rp) { 2033 sfp->headrp = prev_rp->nextrp; 2034 prev_rp->parentfp = NULL; 2035 res = 1; 2036 } else { 2037 while ((rp = prev_rp->nextrp)) { 2038 if (srp == rp) { 2039 prev_rp->nextrp = rp->nextrp; 2040 rp->parentfp = NULL; 2041 res = 1; 2042 break; 2043 } 2044 prev_rp = rp; 2045 } 2046 } 2047 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2048 return res; 2049 } 2050 2051 static Sg_fd * 2052 sg_add_sfp(Sg_device * sdp, int dev) 2053 { 2054 Sg_fd *sfp; 2055 unsigned long iflags; 2056 int bufflen; 2057 2058 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2059 if (!sfp) 2060 return NULL; 2061 2062 init_waitqueue_head(&sfp->read_wait); 2063 rwlock_init(&sfp->rq_list_lock); 2064 2065 kref_init(&sfp->f_ref); 2066 sfp->timeout = SG_DEFAULT_TIMEOUT; 2067 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2068 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2069 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2070 sdp->device->host->unchecked_isa_dma : 1; 2071 sfp->cmd_q = SG_DEF_COMMAND_Q; 2072 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2073 sfp->parentdp = sdp; 2074 write_lock_irqsave(&sg_index_lock, iflags); 2075 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2076 write_unlock_irqrestore(&sg_index_lock, iflags); 2077 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2078 if (unlikely(sg_big_buff != def_reserved_size)) 2079 sg_big_buff = def_reserved_size; 2080 2081 bufflen = min_t(int, sg_big_buff, 2082 queue_max_sectors(sdp->device->request_queue) * 512); 2083 sg_build_reserve(sfp, bufflen); 2084 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2085 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2086 2087 kref_get(&sdp->d_ref); 2088 __module_get(THIS_MODULE); 2089 return sfp; 2090 } 2091 2092 static void sg_remove_sfp_usercontext(struct work_struct *work) 2093 { 2094 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2095 struct sg_device *sdp = sfp->parentdp; 2096 2097 /* Cleanup any responses which were never read(). */ 2098 while (sfp->headrp) 2099 sg_finish_rem_req(sfp->headrp); 2100 2101 if (sfp->reserve.bufflen > 0) { 2102 SCSI_LOG_TIMEOUT(6, 2103 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2104 (int) sfp->reserve.bufflen, 2105 (int) sfp->reserve.k_use_sg)); 2106 sg_remove_scat(&sfp->reserve); 2107 } 2108 2109 SCSI_LOG_TIMEOUT(6, 2110 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2111 sdp->disk->disk_name, 2112 sfp)); 2113 kfree(sfp); 2114 2115 scsi_device_put(sdp->device); 2116 sg_put_dev(sdp); 2117 module_put(THIS_MODULE); 2118 } 2119 2120 static void sg_remove_sfp(struct kref *kref) 2121 { 2122 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2123 struct sg_device *sdp = sfp->parentdp; 2124 unsigned long iflags; 2125 2126 write_lock_irqsave(&sg_index_lock, iflags); 2127 list_del(&sfp->sfd_siblings); 2128 write_unlock_irqrestore(&sg_index_lock, iflags); 2129 wake_up_interruptible(&sdp->o_excl_wait); 2130 2131 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2132 schedule_work(&sfp->ew.work); 2133 } 2134 2135 static int 2136 sg_res_in_use(Sg_fd * sfp) 2137 { 2138 const Sg_request *srp; 2139 unsigned long iflags; 2140 2141 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2142 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2143 if (srp->res_used) 2144 break; 2145 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2146 return srp ? 1 : 0; 2147 } 2148 2149 #ifdef CONFIG_SCSI_PROC_FS 2150 static int 2151 sg_idr_max_id(int id, void *p, void *data) 2152 { 2153 int *k = data; 2154 2155 if (*k < id) 2156 *k = id; 2157 2158 return 0; 2159 } 2160 2161 static int 2162 sg_last_dev(void) 2163 { 2164 int k = -1; 2165 unsigned long iflags; 2166 2167 read_lock_irqsave(&sg_index_lock, iflags); 2168 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2169 read_unlock_irqrestore(&sg_index_lock, iflags); 2170 return k + 1; /* origin 1 */ 2171 } 2172 #endif 2173 2174 /* must be called with sg_index_lock held */ 2175 static Sg_device *sg_lookup_dev(int dev) 2176 { 2177 return idr_find(&sg_index_idr, dev); 2178 } 2179 2180 static Sg_device *sg_get_dev(int dev) 2181 { 2182 struct sg_device *sdp; 2183 unsigned long flags; 2184 2185 read_lock_irqsave(&sg_index_lock, flags); 2186 sdp = sg_lookup_dev(dev); 2187 if (!sdp) 2188 sdp = ERR_PTR(-ENXIO); 2189 else if (sdp->detached) { 2190 /* If sdp->detached, then the refcount may already be 0, in 2191 * which case it would be a bug to do kref_get(). 2192 */ 2193 sdp = ERR_PTR(-ENODEV); 2194 } else 2195 kref_get(&sdp->d_ref); 2196 read_unlock_irqrestore(&sg_index_lock, flags); 2197 2198 return sdp; 2199 } 2200 2201 static void sg_put_dev(struct sg_device *sdp) 2202 { 2203 kref_put(&sdp->d_ref, sg_device_destroy); 2204 } 2205 2206 #ifdef CONFIG_SCSI_PROC_FS 2207 2208 static struct proc_dir_entry *sg_proc_sgp = NULL; 2209 2210 static char sg_proc_sg_dirname[] = "scsi/sg"; 2211 2212 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2213 2214 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2215 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2216 size_t count, loff_t *off); 2217 static const struct file_operations adio_fops = { 2218 .owner = THIS_MODULE, 2219 .open = sg_proc_single_open_adio, 2220 .read = seq_read, 2221 .llseek = seq_lseek, 2222 .write = sg_proc_write_adio, 2223 .release = single_release, 2224 }; 2225 2226 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2227 static ssize_t sg_proc_write_dressz(struct file *filp, 2228 const char __user *buffer, size_t count, loff_t *off); 2229 static const struct file_operations dressz_fops = { 2230 .owner = THIS_MODULE, 2231 .open = sg_proc_single_open_dressz, 2232 .read = seq_read, 2233 .llseek = seq_lseek, 2234 .write = sg_proc_write_dressz, 2235 .release = single_release, 2236 }; 2237 2238 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2239 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2240 static const struct file_operations version_fops = { 2241 .owner = THIS_MODULE, 2242 .open = sg_proc_single_open_version, 2243 .read = seq_read, 2244 .llseek = seq_lseek, 2245 .release = single_release, 2246 }; 2247 2248 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2249 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2250 static const struct file_operations devhdr_fops = { 2251 .owner = THIS_MODULE, 2252 .open = sg_proc_single_open_devhdr, 2253 .read = seq_read, 2254 .llseek = seq_lseek, 2255 .release = single_release, 2256 }; 2257 2258 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2259 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2260 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2261 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2262 static void dev_seq_stop(struct seq_file *s, void *v); 2263 static const struct file_operations dev_fops = { 2264 .owner = THIS_MODULE, 2265 .open = sg_proc_open_dev, 2266 .read = seq_read, 2267 .llseek = seq_lseek, 2268 .release = seq_release, 2269 }; 2270 static const struct seq_operations dev_seq_ops = { 2271 .start = dev_seq_start, 2272 .next = dev_seq_next, 2273 .stop = dev_seq_stop, 2274 .show = sg_proc_seq_show_dev, 2275 }; 2276 2277 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2278 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2279 static const struct file_operations devstrs_fops = { 2280 .owner = THIS_MODULE, 2281 .open = sg_proc_open_devstrs, 2282 .read = seq_read, 2283 .llseek = seq_lseek, 2284 .release = seq_release, 2285 }; 2286 static const struct seq_operations devstrs_seq_ops = { 2287 .start = dev_seq_start, 2288 .next = dev_seq_next, 2289 .stop = dev_seq_stop, 2290 .show = sg_proc_seq_show_devstrs, 2291 }; 2292 2293 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2294 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2295 static const struct file_operations debug_fops = { 2296 .owner = THIS_MODULE, 2297 .open = sg_proc_open_debug, 2298 .read = seq_read, 2299 .llseek = seq_lseek, 2300 .release = seq_release, 2301 }; 2302 static const struct seq_operations debug_seq_ops = { 2303 .start = dev_seq_start, 2304 .next = dev_seq_next, 2305 .stop = dev_seq_stop, 2306 .show = sg_proc_seq_show_debug, 2307 }; 2308 2309 2310 struct sg_proc_leaf { 2311 const char * name; 2312 const struct file_operations * fops; 2313 }; 2314 2315 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2316 {"allow_dio", &adio_fops}, 2317 {"debug", &debug_fops}, 2318 {"def_reserved_size", &dressz_fops}, 2319 {"device_hdr", &devhdr_fops}, 2320 {"devices", &dev_fops}, 2321 {"device_strs", &devstrs_fops}, 2322 {"version", &version_fops} 2323 }; 2324 2325 static int 2326 sg_proc_init(void) 2327 { 2328 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2329 int k; 2330 2331 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2332 if (!sg_proc_sgp) 2333 return 1; 2334 for (k = 0; k < num_leaves; ++k) { 2335 struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2336 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2337 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2338 } 2339 return 0; 2340 } 2341 2342 static void 2343 sg_proc_cleanup(void) 2344 { 2345 int k; 2346 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2347 2348 if (!sg_proc_sgp) 2349 return; 2350 for (k = 0; k < num_leaves; ++k) 2351 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2352 remove_proc_entry(sg_proc_sg_dirname, NULL); 2353 } 2354 2355 2356 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2357 { 2358 seq_printf(s, "%d\n", *((int *)s->private)); 2359 return 0; 2360 } 2361 2362 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2363 { 2364 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2365 } 2366 2367 static ssize_t 2368 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2369 size_t count, loff_t *off) 2370 { 2371 int err; 2372 unsigned long num; 2373 2374 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2375 return -EACCES; 2376 err = kstrtoul_from_user(buffer, count, 0, &num); 2377 if (err) 2378 return err; 2379 sg_allow_dio = num ? 1 : 0; 2380 return count; 2381 } 2382 2383 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2384 { 2385 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2386 } 2387 2388 static ssize_t 2389 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2390 size_t count, loff_t *off) 2391 { 2392 int err; 2393 unsigned long k = ULONG_MAX; 2394 2395 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2396 return -EACCES; 2397 2398 err = kstrtoul_from_user(buffer, count, 0, &k); 2399 if (err) 2400 return err; 2401 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2402 sg_big_buff = k; 2403 return count; 2404 } 2405 return -ERANGE; 2406 } 2407 2408 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2409 { 2410 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2411 sg_version_date); 2412 return 0; 2413 } 2414 2415 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2416 { 2417 return single_open(file, sg_proc_seq_show_version, NULL); 2418 } 2419 2420 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2421 { 2422 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2423 "online\n"); 2424 return 0; 2425 } 2426 2427 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2428 { 2429 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2430 } 2431 2432 struct sg_proc_deviter { 2433 loff_t index; 2434 size_t max; 2435 }; 2436 2437 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2438 { 2439 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2440 2441 s->private = it; 2442 if (! it) 2443 return NULL; 2444 2445 it->index = *pos; 2446 it->max = sg_last_dev(); 2447 if (it->index >= it->max) 2448 return NULL; 2449 return it; 2450 } 2451 2452 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2453 { 2454 struct sg_proc_deviter * it = s->private; 2455 2456 *pos = ++it->index; 2457 return (it->index < it->max) ? it : NULL; 2458 } 2459 2460 static void dev_seq_stop(struct seq_file *s, void *v) 2461 { 2462 kfree(s->private); 2463 } 2464 2465 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2466 { 2467 return seq_open(file, &dev_seq_ops); 2468 } 2469 2470 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2471 { 2472 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2473 Sg_device *sdp; 2474 struct scsi_device *scsidp; 2475 unsigned long iflags; 2476 2477 read_lock_irqsave(&sg_index_lock, iflags); 2478 sdp = it ? sg_lookup_dev(it->index) : NULL; 2479 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2480 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2481 scsidp->host->host_no, scsidp->channel, 2482 scsidp->id, scsidp->lun, (int) scsidp->type, 2483 1, 2484 (int) scsidp->queue_depth, 2485 (int) scsidp->device_busy, 2486 (int) scsi_device_online(scsidp)); 2487 else 2488 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2489 read_unlock_irqrestore(&sg_index_lock, iflags); 2490 return 0; 2491 } 2492 2493 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2494 { 2495 return seq_open(file, &devstrs_seq_ops); 2496 } 2497 2498 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2499 { 2500 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2501 Sg_device *sdp; 2502 struct scsi_device *scsidp; 2503 unsigned long iflags; 2504 2505 read_lock_irqsave(&sg_index_lock, iflags); 2506 sdp = it ? sg_lookup_dev(it->index) : NULL; 2507 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2508 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2509 scsidp->vendor, scsidp->model, scsidp->rev); 2510 else 2511 seq_printf(s, "<no active device>\n"); 2512 read_unlock_irqrestore(&sg_index_lock, iflags); 2513 return 0; 2514 } 2515 2516 /* must be called while holding sg_index_lock */ 2517 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2518 { 2519 int k, m, new_interface, blen, usg; 2520 Sg_request *srp; 2521 Sg_fd *fp; 2522 const sg_io_hdr_t *hp; 2523 const char * cp; 2524 unsigned int ms; 2525 2526 k = 0; 2527 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2528 k++; 2529 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2530 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2531 "(res)sgat=%d low_dma=%d\n", k, 2532 jiffies_to_msecs(fp->timeout), 2533 fp->reserve.bufflen, 2534 (int) fp->reserve.k_use_sg, 2535 (int) fp->low_dma); 2536 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2537 (int) fp->cmd_q, (int) fp->force_packid, 2538 (int) fp->keep_orphan, (int) fp->closed); 2539 for (m = 0, srp = fp->headrp; 2540 srp != NULL; 2541 ++m, srp = srp->nextrp) { 2542 hp = &srp->header; 2543 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2544 if (srp->res_used) { 2545 if (new_interface && 2546 (SG_FLAG_MMAP_IO & hp->flags)) 2547 cp = " mmap>> "; 2548 else 2549 cp = " rb>> "; 2550 } else { 2551 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2552 cp = " dio>> "; 2553 else 2554 cp = " "; 2555 } 2556 seq_printf(s, cp); 2557 blen = srp->data.bufflen; 2558 usg = srp->data.k_use_sg; 2559 seq_printf(s, srp->done ? 2560 ((1 == srp->done) ? "rcv:" : "fin:") 2561 : "act:"); 2562 seq_printf(s, " id=%d blen=%d", 2563 srp->header.pack_id, blen); 2564 if (srp->done) 2565 seq_printf(s, " dur=%d", hp->duration); 2566 else { 2567 ms = jiffies_to_msecs(jiffies); 2568 seq_printf(s, " t_o/elap=%d/%d", 2569 (new_interface ? hp->timeout : 2570 jiffies_to_msecs(fp->timeout)), 2571 (ms > hp->duration ? ms - hp->duration : 0)); 2572 } 2573 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2574 (int) srp->data.cmd_opcode); 2575 } 2576 if (0 == m) 2577 seq_printf(s, " No requests active\n"); 2578 read_unlock(&fp->rq_list_lock); 2579 } 2580 } 2581 2582 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2583 { 2584 return seq_open(file, &debug_seq_ops); 2585 } 2586 2587 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2588 { 2589 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2590 Sg_device *sdp; 2591 unsigned long iflags; 2592 2593 if (it && (0 == it->index)) { 2594 seq_printf(s, "max_active_device=%d(origin 1)\n", 2595 (int)it->max); 2596 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2597 } 2598 2599 read_lock_irqsave(&sg_index_lock, iflags); 2600 sdp = it ? sg_lookup_dev(it->index) : NULL; 2601 if (sdp && !list_empty(&sdp->sfds)) { 2602 struct scsi_device *scsidp = sdp->device; 2603 2604 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2605 if (sdp->detached) 2606 seq_printf(s, "detached pending close "); 2607 else 2608 seq_printf 2609 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2610 scsidp->host->host_no, 2611 scsidp->channel, scsidp->id, 2612 scsidp->lun, 2613 scsidp->host->hostt->emulated); 2614 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2615 sdp->sg_tablesize, sdp->exclude); 2616 sg_proc_debug_helper(s, sdp); 2617 } 2618 read_unlock_irqrestore(&sg_index_lock, iflags); 2619 return 0; 2620 } 2621 2622 #endif /* CONFIG_SCSI_PROC_FS */ 2623 2624 module_init(init_sg); 2625 module_exit(exit_sg); 2626