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 54 #include "scsi.h" 55 #include <scsi/scsi_dbg.h> 56 #include <scsi/scsi_host.h> 57 #include <scsi/scsi_driver.h> 58 #include <scsi/scsi_ioctl.h> 59 #include <scsi/sg.h> 60 61 #include "scsi_logging.h" 62 63 #ifdef CONFIG_SCSI_PROC_FS 64 #include <linux/proc_fs.h> 65 static char *sg_version_date = "20061027"; 66 67 static int sg_proc_init(void); 68 static void sg_proc_cleanup(void); 69 #endif 70 71 #define SG_ALLOW_DIO_DEF 0 72 73 #define SG_MAX_DEVS 32768 74 75 /* 76 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 77 * Then when using 32 bit integers x * m may overflow during the calculation. 78 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 79 * calculates the same, but prevents the overflow when both m and d 80 * are "small" numbers (like HZ and USER_HZ). 81 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 82 * in 32 bits. 83 */ 84 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 85 86 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 87 88 int sg_big_buff = SG_DEF_RESERVED_SIZE; 89 /* N.B. This variable is readable and writeable via 90 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 91 of this size (or less if there is not enough memory) will be reserved 92 for use by this file descriptor. [Deprecated usage: this variable is also 93 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 94 the kernel (i.e. it is not a module).] */ 95 static int def_reserved_size = -1; /* picks up init parameter */ 96 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 97 98 static int scatter_elem_sz = SG_SCATTER_SZ; 99 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 100 101 #define SG_SECTOR_SZ 512 102 103 static int sg_add(struct device *, struct class_interface *); 104 static void sg_remove(struct device *, struct class_interface *); 105 106 static DEFINE_MUTEX(sg_mutex); 107 108 static DEFINE_IDR(sg_index_idr); 109 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 110 file descriptor list for device */ 111 112 static struct class_interface sg_interface = { 113 .add_dev = sg_add, 114 .remove_dev = sg_remove, 115 }; 116 117 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 118 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 119 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 120 unsigned bufflen; /* Size of (aggregate) data buffer */ 121 struct page **pages; 122 int page_order; 123 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 124 unsigned char cmd_opcode; /* first byte of command */ 125 } Sg_scatter_hold; 126 127 struct sg_device; /* forward declarations */ 128 struct sg_fd; 129 130 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 131 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 132 struct sg_fd *parentfp; /* NULL -> not in use */ 133 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 134 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 135 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 136 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 137 char orphan; /* 1 -> drop on sight, 0 -> normal */ 138 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 139 volatile char done; /* 0->before bh, 1->before read, 2->read */ 140 struct request *rq; 141 struct bio *bio; 142 struct execute_work ew; 143 } Sg_request; 144 145 typedef struct sg_fd { /* holds the state of a file descriptor */ 146 struct list_head sfd_siblings; 147 struct sg_device *parentdp; /* owning device */ 148 wait_queue_head_t read_wait; /* queue read until command done */ 149 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 150 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 151 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 152 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 153 unsigned save_scat_len; /* original length of trunc. scat. element */ 154 Sg_request *headrp; /* head of request slist, NULL->empty */ 155 struct fasync_struct *async_qp; /* used by asynchronous notification */ 156 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 157 char low_dma; /* as in parent but possibly overridden to 1 */ 158 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 159 volatile char closed; /* 1 -> fd closed but request(s) outstanding */ 160 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 161 char next_cmd_len; /* 0 -> automatic (def), >0 -> use on next write() */ 162 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 163 char mmap_called; /* 0 -> mmap() never called on this fd */ 164 struct kref f_ref; 165 struct execute_work ew; 166 } Sg_fd; 167 168 typedef struct sg_device { /* holds the state of each scsi generic device */ 169 struct scsi_device *device; 170 wait_queue_head_t o_excl_wait; /* queue open() when O_EXCL in use */ 171 int sg_tablesize; /* adapter's max scatter-gather table size */ 172 u32 index; /* device index number */ 173 struct list_head sfds; 174 volatile char detached; /* 0->attached, 1->detached pending removal */ 175 volatile char exclude; /* opened for exclusive access */ 176 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 177 struct gendisk *disk; 178 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 179 struct kref d_ref; 180 } Sg_device; 181 182 /* tasklet or soft irq callback */ 183 static void sg_rq_end_io(struct request *rq, int uptodate); 184 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 185 static int sg_finish_rem_req(Sg_request * srp); 186 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 187 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 188 Sg_request * srp); 189 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 190 const char __user *buf, size_t count, int blocking, 191 int read_only, int sg_io_owned, Sg_request **o_srp); 192 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 193 unsigned char *cmnd, int timeout, int blocking); 194 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 195 static void sg_remove_scat(Sg_scatter_hold * schp); 196 static void sg_build_reserve(Sg_fd * sfp, int req_size); 197 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 198 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 199 static Sg_fd *sg_add_sfp(Sg_device * sdp, int dev); 200 static void sg_remove_sfp(struct kref *); 201 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 202 static Sg_request *sg_add_request(Sg_fd * sfp); 203 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 204 static int sg_res_in_use(Sg_fd * sfp); 205 static Sg_device *sg_get_dev(int dev); 206 static void sg_put_dev(Sg_device *sdp); 207 208 #define SZ_SG_HEADER sizeof(struct sg_header) 209 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 210 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 211 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 212 213 static int sg_allow_access(struct file *filp, unsigned char *cmd) 214 { 215 struct sg_fd *sfp = filp->private_data; 216 217 if (sfp->parentdp->device->type == TYPE_SCANNER) 218 return 0; 219 220 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 221 } 222 223 static int 224 sg_open(struct inode *inode, struct file *filp) 225 { 226 int dev = iminor(inode); 227 int flags = filp->f_flags; 228 struct request_queue *q; 229 Sg_device *sdp; 230 Sg_fd *sfp; 231 int res; 232 int retval; 233 234 mutex_lock(&sg_mutex); 235 nonseekable_open(inode, filp); 236 SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags)); 237 sdp = sg_get_dev(dev); 238 if (IS_ERR(sdp)) { 239 retval = PTR_ERR(sdp); 240 sdp = NULL; 241 goto sg_put; 242 } 243 244 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 245 /* Prevent the device driver from vanishing while we sleep */ 246 retval = scsi_device_get(sdp->device); 247 if (retval) 248 goto sg_put; 249 250 retval = scsi_autopm_get_device(sdp->device); 251 if (retval) 252 goto sdp_put; 253 254 if (!((flags & O_NONBLOCK) || 255 scsi_block_when_processing_errors(sdp->device))) { 256 retval = -ENXIO; 257 /* we are in error recovery for this device */ 258 goto error_out; 259 } 260 261 if (flags & O_EXCL) { 262 if (O_RDONLY == (flags & O_ACCMODE)) { 263 retval = -EPERM; /* Can't lock it with read only access */ 264 goto error_out; 265 } 266 if (!list_empty(&sdp->sfds) && (flags & O_NONBLOCK)) { 267 retval = -EBUSY; 268 goto error_out; 269 } 270 res = 0; 271 __wait_event_interruptible(sdp->o_excl_wait, 272 ((!list_empty(&sdp->sfds) || sdp->exclude) ? 0 : (sdp->exclude = 1)), res); 273 if (res) { 274 retval = res; /* -ERESTARTSYS because signal hit process */ 275 goto error_out; 276 } 277 } else if (sdp->exclude) { /* some other fd has an exclusive lock on dev */ 278 if (flags & O_NONBLOCK) { 279 retval = -EBUSY; 280 goto error_out; 281 } 282 res = 0; 283 __wait_event_interruptible(sdp->o_excl_wait, (!sdp->exclude), 284 res); 285 if (res) { 286 retval = res; /* -ERESTARTSYS because signal hit process */ 287 goto error_out; 288 } 289 } 290 if (sdp->detached) { 291 retval = -ENODEV; 292 goto error_out; 293 } 294 if (list_empty(&sdp->sfds)) { /* no existing opens on this device */ 295 sdp->sgdebug = 0; 296 q = sdp->device->request_queue; 297 sdp->sg_tablesize = queue_max_segments(q); 298 } 299 if ((sfp = sg_add_sfp(sdp, dev))) 300 filp->private_data = sfp; 301 else { 302 if (flags & O_EXCL) { 303 sdp->exclude = 0; /* undo if error */ 304 wake_up_interruptible(&sdp->o_excl_wait); 305 } 306 retval = -ENOMEM; 307 goto error_out; 308 } 309 retval = 0; 310 error_out: 311 if (retval) { 312 scsi_autopm_put_device(sdp->device); 313 sdp_put: 314 scsi_device_put(sdp->device); 315 } 316 sg_put: 317 if (sdp) 318 sg_put_dev(sdp); 319 mutex_unlock(&sg_mutex); 320 return retval; 321 } 322 323 /* Following function was formerly called 'sg_close' */ 324 static int 325 sg_release(struct inode *inode, struct file *filp) 326 { 327 Sg_device *sdp; 328 Sg_fd *sfp; 329 330 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 331 return -ENXIO; 332 SCSI_LOG_TIMEOUT(3, printk("sg_release: %s\n", sdp->disk->disk_name)); 333 334 sfp->closed = 1; 335 336 sdp->exclude = 0; 337 wake_up_interruptible(&sdp->o_excl_wait); 338 339 scsi_autopm_put_device(sdp->device); 340 kref_put(&sfp->f_ref, sg_remove_sfp); 341 return 0; 342 } 343 344 static ssize_t 345 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 346 { 347 Sg_device *sdp; 348 Sg_fd *sfp; 349 Sg_request *srp; 350 int req_pack_id = -1; 351 sg_io_hdr_t *hp; 352 struct sg_header *old_hdr = NULL; 353 int retval = 0; 354 355 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 356 return -ENXIO; 357 SCSI_LOG_TIMEOUT(3, printk("sg_read: %s, count=%d\n", 358 sdp->disk->disk_name, (int) count)); 359 360 if (!access_ok(VERIFY_WRITE, buf, count)) 361 return -EFAULT; 362 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 363 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 364 if (!old_hdr) 365 return -ENOMEM; 366 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 367 retval = -EFAULT; 368 goto free_old_hdr; 369 } 370 if (old_hdr->reply_len < 0) { 371 if (count >= SZ_SG_IO_HDR) { 372 sg_io_hdr_t *new_hdr; 373 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 374 if (!new_hdr) { 375 retval = -ENOMEM; 376 goto free_old_hdr; 377 } 378 retval =__copy_from_user 379 (new_hdr, buf, SZ_SG_IO_HDR); 380 req_pack_id = new_hdr->pack_id; 381 kfree(new_hdr); 382 if (retval) { 383 retval = -EFAULT; 384 goto free_old_hdr; 385 } 386 } 387 } else 388 req_pack_id = old_hdr->pack_id; 389 } 390 srp = sg_get_rq_mark(sfp, req_pack_id); 391 if (!srp) { /* now wait on packet to arrive */ 392 if (sdp->detached) { 393 retval = -ENODEV; 394 goto free_old_hdr; 395 } 396 if (filp->f_flags & O_NONBLOCK) { 397 retval = -EAGAIN; 398 goto free_old_hdr; 399 } 400 while (1) { 401 retval = 0; /* following macro beats race condition */ 402 __wait_event_interruptible(sfp->read_wait, 403 (sdp->detached || 404 (srp = sg_get_rq_mark(sfp, req_pack_id))), 405 retval); 406 if (sdp->detached) { 407 retval = -ENODEV; 408 goto free_old_hdr; 409 } 410 if (0 == retval) 411 break; 412 413 /* -ERESTARTSYS as signal hit process */ 414 goto free_old_hdr; 415 } 416 } 417 if (srp->header.interface_id != '\0') { 418 retval = sg_new_read(sfp, buf, count, srp); 419 goto free_old_hdr; 420 } 421 422 hp = &srp->header; 423 if (old_hdr == NULL) { 424 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 425 if (! old_hdr) { 426 retval = -ENOMEM; 427 goto free_old_hdr; 428 } 429 } 430 memset(old_hdr, 0, SZ_SG_HEADER); 431 old_hdr->reply_len = (int) hp->timeout; 432 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 433 old_hdr->pack_id = hp->pack_id; 434 old_hdr->twelve_byte = 435 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 436 old_hdr->target_status = hp->masked_status; 437 old_hdr->host_status = hp->host_status; 438 old_hdr->driver_status = hp->driver_status; 439 if ((CHECK_CONDITION & hp->masked_status) || 440 (DRIVER_SENSE & hp->driver_status)) 441 memcpy(old_hdr->sense_buffer, srp->sense_b, 442 sizeof (old_hdr->sense_buffer)); 443 switch (hp->host_status) { 444 /* This setup of 'result' is for backward compatibility and is best 445 ignored by the user who should use target, host + driver status */ 446 case DID_OK: 447 case DID_PASSTHROUGH: 448 case DID_SOFT_ERROR: 449 old_hdr->result = 0; 450 break; 451 case DID_NO_CONNECT: 452 case DID_BUS_BUSY: 453 case DID_TIME_OUT: 454 old_hdr->result = EBUSY; 455 break; 456 case DID_BAD_TARGET: 457 case DID_ABORT: 458 case DID_PARITY: 459 case DID_RESET: 460 case DID_BAD_INTR: 461 old_hdr->result = EIO; 462 break; 463 case DID_ERROR: 464 old_hdr->result = (srp->sense_b[0] == 0 && 465 hp->masked_status == GOOD) ? 0 : EIO; 466 break; 467 default: 468 old_hdr->result = EIO; 469 break; 470 } 471 472 /* Now copy the result back to the user buffer. */ 473 if (count >= SZ_SG_HEADER) { 474 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 475 retval = -EFAULT; 476 goto free_old_hdr; 477 } 478 buf += SZ_SG_HEADER; 479 if (count > old_hdr->reply_len) 480 count = old_hdr->reply_len; 481 if (count > SZ_SG_HEADER) { 482 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 483 retval = -EFAULT; 484 goto free_old_hdr; 485 } 486 } 487 } else 488 count = (old_hdr->result == 0) ? 0 : -EIO; 489 sg_finish_rem_req(srp); 490 retval = count; 491 free_old_hdr: 492 kfree(old_hdr); 493 return retval; 494 } 495 496 static ssize_t 497 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 498 { 499 sg_io_hdr_t *hp = &srp->header; 500 int err = 0; 501 int len; 502 503 if (count < SZ_SG_IO_HDR) { 504 err = -EINVAL; 505 goto err_out; 506 } 507 hp->sb_len_wr = 0; 508 if ((hp->mx_sb_len > 0) && hp->sbp) { 509 if ((CHECK_CONDITION & hp->masked_status) || 510 (DRIVER_SENSE & hp->driver_status)) { 511 int sb_len = SCSI_SENSE_BUFFERSIZE; 512 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 513 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 514 len = (len > sb_len) ? sb_len : len; 515 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 516 err = -EFAULT; 517 goto err_out; 518 } 519 hp->sb_len_wr = len; 520 } 521 } 522 if (hp->masked_status || hp->host_status || hp->driver_status) 523 hp->info |= SG_INFO_CHECK; 524 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 525 err = -EFAULT; 526 goto err_out; 527 } 528 err_out: 529 err = sg_finish_rem_req(srp); 530 return (0 == err) ? count : err; 531 } 532 533 static ssize_t 534 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 535 { 536 int mxsize, cmd_size, k; 537 int input_size, blocking; 538 unsigned char opcode; 539 Sg_device *sdp; 540 Sg_fd *sfp; 541 Sg_request *srp; 542 struct sg_header old_hdr; 543 sg_io_hdr_t *hp; 544 unsigned char cmnd[MAX_COMMAND_SIZE]; 545 546 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 547 return -ENXIO; 548 SCSI_LOG_TIMEOUT(3, printk("sg_write: %s, count=%d\n", 549 sdp->disk->disk_name, (int) count)); 550 if (sdp->detached) 551 return -ENODEV; 552 if (!((filp->f_flags & O_NONBLOCK) || 553 scsi_block_when_processing_errors(sdp->device))) 554 return -ENXIO; 555 556 if (!access_ok(VERIFY_READ, buf, count)) 557 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 558 if (count < SZ_SG_HEADER) 559 return -EIO; 560 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 561 return -EFAULT; 562 blocking = !(filp->f_flags & O_NONBLOCK); 563 if (old_hdr.reply_len < 0) 564 return sg_new_write(sfp, filp, buf, count, 565 blocking, 0, 0, NULL); 566 if (count < (SZ_SG_HEADER + 6)) 567 return -EIO; /* The minimum scsi command length is 6 bytes. */ 568 569 if (!(srp = sg_add_request(sfp))) { 570 SCSI_LOG_TIMEOUT(1, printk("sg_write: queue full\n")); 571 return -EDOM; 572 } 573 buf += SZ_SG_HEADER; 574 __get_user(opcode, buf); 575 if (sfp->next_cmd_len > 0) { 576 if (sfp->next_cmd_len > MAX_COMMAND_SIZE) { 577 SCSI_LOG_TIMEOUT(1, printk("sg_write: command length too long\n")); 578 sfp->next_cmd_len = 0; 579 sg_remove_request(sfp, srp); 580 return -EIO; 581 } 582 cmd_size = sfp->next_cmd_len; 583 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 584 } else { 585 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 586 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 587 cmd_size = 12; 588 } 589 SCSI_LOG_TIMEOUT(4, printk( 590 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 591 /* Determine buffer size. */ 592 input_size = count - cmd_size; 593 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 594 mxsize -= SZ_SG_HEADER; 595 input_size -= SZ_SG_HEADER; 596 if (input_size < 0) { 597 sg_remove_request(sfp, srp); 598 return -EIO; /* User did not pass enough bytes for this command. */ 599 } 600 hp = &srp->header; 601 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 602 hp->cmd_len = (unsigned char) cmd_size; 603 hp->iovec_count = 0; 604 hp->mx_sb_len = 0; 605 if (input_size > 0) 606 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 607 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 608 else 609 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 610 hp->dxfer_len = mxsize; 611 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 612 hp->dxferp = (char __user *)buf + cmd_size; 613 else 614 hp->dxferp = NULL; 615 hp->sbp = NULL; 616 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 617 hp->flags = input_size; /* structure abuse ... */ 618 hp->pack_id = old_hdr.pack_id; 619 hp->usr_ptr = NULL; 620 if (__copy_from_user(cmnd, buf, cmd_size)) 621 return -EFAULT; 622 /* 623 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 624 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 625 * is a non-zero input_size, so emit a warning. 626 */ 627 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 628 static char cmd[TASK_COMM_LEN]; 629 if (strcmp(current->comm, cmd) && printk_ratelimit()) { 630 printk(KERN_WARNING 631 "sg_write: data in/out %d/%d bytes for SCSI command 0x%x--" 632 "guessing data in;\n " 633 "program %s not setting count and/or reply_len properly\n", 634 old_hdr.reply_len - (int)SZ_SG_HEADER, 635 input_size, (unsigned int) cmnd[0], 636 current->comm); 637 strcpy(cmd, current->comm); 638 } 639 } 640 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 641 return (k < 0) ? k : count; 642 } 643 644 static ssize_t 645 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 646 size_t count, int blocking, int read_only, int sg_io_owned, 647 Sg_request **o_srp) 648 { 649 int k; 650 Sg_request *srp; 651 sg_io_hdr_t *hp; 652 unsigned char cmnd[MAX_COMMAND_SIZE]; 653 int timeout; 654 unsigned long ul_timeout; 655 656 if (count < SZ_SG_IO_HDR) 657 return -EINVAL; 658 if (!access_ok(VERIFY_READ, buf, count)) 659 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 660 661 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 662 if (!(srp = sg_add_request(sfp))) { 663 SCSI_LOG_TIMEOUT(1, printk("sg_new_write: queue full\n")); 664 return -EDOM; 665 } 666 srp->sg_io_owned = sg_io_owned; 667 hp = &srp->header; 668 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 669 sg_remove_request(sfp, srp); 670 return -EFAULT; 671 } 672 if (hp->interface_id != 'S') { 673 sg_remove_request(sfp, srp); 674 return -ENOSYS; 675 } 676 if (hp->flags & SG_FLAG_MMAP_IO) { 677 if (hp->dxfer_len > sfp->reserve.bufflen) { 678 sg_remove_request(sfp, srp); 679 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 680 } 681 if (hp->flags & SG_FLAG_DIRECT_IO) { 682 sg_remove_request(sfp, srp); 683 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 684 } 685 if (sg_res_in_use(sfp)) { 686 sg_remove_request(sfp, srp); 687 return -EBUSY; /* reserve buffer already being used */ 688 } 689 } 690 ul_timeout = msecs_to_jiffies(srp->header.timeout); 691 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 692 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 693 sg_remove_request(sfp, srp); 694 return -EMSGSIZE; 695 } 696 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 697 sg_remove_request(sfp, srp); 698 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 699 } 700 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 701 sg_remove_request(sfp, srp); 702 return -EFAULT; 703 } 704 if (read_only && sg_allow_access(file, cmnd)) { 705 sg_remove_request(sfp, srp); 706 return -EPERM; 707 } 708 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 709 if (k < 0) 710 return k; 711 if (o_srp) 712 *o_srp = srp; 713 return count; 714 } 715 716 static int 717 sg_common_write(Sg_fd * sfp, Sg_request * srp, 718 unsigned char *cmnd, int timeout, int blocking) 719 { 720 int k, data_dir; 721 Sg_device *sdp = sfp->parentdp; 722 sg_io_hdr_t *hp = &srp->header; 723 724 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 725 hp->status = 0; 726 hp->masked_status = 0; 727 hp->msg_status = 0; 728 hp->info = 0; 729 hp->host_status = 0; 730 hp->driver_status = 0; 731 hp->resid = 0; 732 SCSI_LOG_TIMEOUT(4, printk("sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 733 (int) cmnd[0], (int) hp->cmd_len)); 734 735 k = sg_start_req(srp, cmnd); 736 if (k) { 737 SCSI_LOG_TIMEOUT(1, printk("sg_common_write: start_req err=%d\n", k)); 738 sg_finish_rem_req(srp); 739 return k; /* probably out of space --> ENOMEM */ 740 } 741 if (sdp->detached) { 742 if (srp->bio) 743 blk_end_request_all(srp->rq, -EIO); 744 sg_finish_rem_req(srp); 745 return -ENODEV; 746 } 747 748 switch (hp->dxfer_direction) { 749 case SG_DXFER_TO_FROM_DEV: 750 case SG_DXFER_FROM_DEV: 751 data_dir = DMA_FROM_DEVICE; 752 break; 753 case SG_DXFER_TO_DEV: 754 data_dir = DMA_TO_DEVICE; 755 break; 756 case SG_DXFER_UNKNOWN: 757 data_dir = DMA_BIDIRECTIONAL; 758 break; 759 default: 760 data_dir = DMA_NONE; 761 break; 762 } 763 hp->duration = jiffies_to_msecs(jiffies); 764 765 srp->rq->timeout = timeout; 766 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 767 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 768 srp->rq, 1, sg_rq_end_io); 769 return 0; 770 } 771 772 static int 773 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 774 { 775 void __user *p = (void __user *)arg; 776 int __user *ip = p; 777 int result, val, read_only; 778 Sg_device *sdp; 779 Sg_fd *sfp; 780 Sg_request *srp; 781 unsigned long iflags; 782 783 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 784 return -ENXIO; 785 786 SCSI_LOG_TIMEOUT(3, printk("sg_ioctl: %s, cmd=0x%x\n", 787 sdp->disk->disk_name, (int) cmd_in)); 788 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 789 790 switch (cmd_in) { 791 case SG_IO: 792 { 793 int blocking = 1; /* ignore O_NONBLOCK flag */ 794 795 if (sdp->detached) 796 return -ENODEV; 797 if (!scsi_block_when_processing_errors(sdp->device)) 798 return -ENXIO; 799 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 800 return -EFAULT; 801 result = 802 sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 803 blocking, read_only, 1, &srp); 804 if (result < 0) 805 return result; 806 while (1) { 807 result = 0; /* following macro to beat race condition */ 808 __wait_event_interruptible(sfp->read_wait, 809 (srp->done || sdp->detached), 810 result); 811 if (sdp->detached) 812 return -ENODEV; 813 write_lock_irq(&sfp->rq_list_lock); 814 if (srp->done) { 815 srp->done = 2; 816 write_unlock_irq(&sfp->rq_list_lock); 817 break; 818 } 819 srp->orphan = 1; 820 write_unlock_irq(&sfp->rq_list_lock); 821 return result; /* -ERESTARTSYS because signal hit process */ 822 } 823 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 824 return (result < 0) ? result : 0; 825 } 826 case SG_SET_TIMEOUT: 827 result = get_user(val, ip); 828 if (result) 829 return result; 830 if (val < 0) 831 return -EIO; 832 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 833 val = MULDIV (INT_MAX, USER_HZ, HZ); 834 sfp->timeout_user = val; 835 sfp->timeout = MULDIV (val, HZ, USER_HZ); 836 837 return 0; 838 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 839 /* strange ..., for backward compatibility */ 840 return sfp->timeout_user; 841 case SG_SET_FORCE_LOW_DMA: 842 result = get_user(val, ip); 843 if (result) 844 return result; 845 if (val) { 846 sfp->low_dma = 1; 847 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 848 val = (int) sfp->reserve.bufflen; 849 sg_remove_scat(&sfp->reserve); 850 sg_build_reserve(sfp, val); 851 } 852 } else { 853 if (sdp->detached) 854 return -ENODEV; 855 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 856 } 857 return 0; 858 case SG_GET_LOW_DMA: 859 return put_user((int) sfp->low_dma, ip); 860 case SG_GET_SCSI_ID: 861 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 862 return -EFAULT; 863 else { 864 sg_scsi_id_t __user *sg_idp = p; 865 866 if (sdp->detached) 867 return -ENODEV; 868 __put_user((int) sdp->device->host->host_no, 869 &sg_idp->host_no); 870 __put_user((int) sdp->device->channel, 871 &sg_idp->channel); 872 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 873 __put_user((int) sdp->device->lun, &sg_idp->lun); 874 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 875 __put_user((short) sdp->device->host->cmd_per_lun, 876 &sg_idp->h_cmd_per_lun); 877 __put_user((short) sdp->device->queue_depth, 878 &sg_idp->d_queue_depth); 879 __put_user(0, &sg_idp->unused[0]); 880 __put_user(0, &sg_idp->unused[1]); 881 return 0; 882 } 883 case SG_SET_FORCE_PACK_ID: 884 result = get_user(val, ip); 885 if (result) 886 return result; 887 sfp->force_packid = val ? 1 : 0; 888 return 0; 889 case SG_GET_PACK_ID: 890 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 891 return -EFAULT; 892 read_lock_irqsave(&sfp->rq_list_lock, iflags); 893 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 894 if ((1 == srp->done) && (!srp->sg_io_owned)) { 895 read_unlock_irqrestore(&sfp->rq_list_lock, 896 iflags); 897 __put_user(srp->header.pack_id, ip); 898 return 0; 899 } 900 } 901 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 902 __put_user(-1, ip); 903 return 0; 904 case SG_GET_NUM_WAITING: 905 read_lock_irqsave(&sfp->rq_list_lock, iflags); 906 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 907 if ((1 == srp->done) && (!srp->sg_io_owned)) 908 ++val; 909 } 910 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 911 return put_user(val, ip); 912 case SG_GET_SG_TABLESIZE: 913 return put_user(sdp->sg_tablesize, ip); 914 case SG_SET_RESERVED_SIZE: 915 result = get_user(val, ip); 916 if (result) 917 return result; 918 if (val < 0) 919 return -EINVAL; 920 val = min_t(int, val, 921 queue_max_sectors(sdp->device->request_queue) * 512); 922 if (val != sfp->reserve.bufflen) { 923 if (sg_res_in_use(sfp) || sfp->mmap_called) 924 return -EBUSY; 925 sg_remove_scat(&sfp->reserve); 926 sg_build_reserve(sfp, val); 927 } 928 return 0; 929 case SG_GET_RESERVED_SIZE: 930 val = min_t(int, sfp->reserve.bufflen, 931 queue_max_sectors(sdp->device->request_queue) * 512); 932 return put_user(val, ip); 933 case SG_SET_COMMAND_Q: 934 result = get_user(val, ip); 935 if (result) 936 return result; 937 sfp->cmd_q = val ? 1 : 0; 938 return 0; 939 case SG_GET_COMMAND_Q: 940 return put_user((int) sfp->cmd_q, ip); 941 case SG_SET_KEEP_ORPHAN: 942 result = get_user(val, ip); 943 if (result) 944 return result; 945 sfp->keep_orphan = val; 946 return 0; 947 case SG_GET_KEEP_ORPHAN: 948 return put_user((int) sfp->keep_orphan, ip); 949 case SG_NEXT_CMD_LEN: 950 result = get_user(val, ip); 951 if (result) 952 return result; 953 sfp->next_cmd_len = (val > 0) ? val : 0; 954 return 0; 955 case SG_GET_VERSION_NUM: 956 return put_user(sg_version_num, ip); 957 case SG_GET_ACCESS_COUNT: 958 /* faked - we don't have a real access count anymore */ 959 val = (sdp->device ? 1 : 0); 960 return put_user(val, ip); 961 case SG_GET_REQUEST_TABLE: 962 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 963 return -EFAULT; 964 else { 965 sg_req_info_t *rinfo; 966 unsigned int ms; 967 968 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 969 GFP_KERNEL); 970 if (!rinfo) 971 return -ENOMEM; 972 read_lock_irqsave(&sfp->rq_list_lock, iflags); 973 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 974 ++val, srp = srp ? srp->nextrp : srp) { 975 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 976 if (srp) { 977 rinfo[val].req_state = srp->done + 1; 978 rinfo[val].problem = 979 srp->header.masked_status & 980 srp->header.host_status & 981 srp->header.driver_status; 982 if (srp->done) 983 rinfo[val].duration = 984 srp->header.duration; 985 else { 986 ms = jiffies_to_msecs(jiffies); 987 rinfo[val].duration = 988 (ms > srp->header.duration) ? 989 (ms - srp->header.duration) : 0; 990 } 991 rinfo[val].orphan = srp->orphan; 992 rinfo[val].sg_io_owned = 993 srp->sg_io_owned; 994 rinfo[val].pack_id = 995 srp->header.pack_id; 996 rinfo[val].usr_ptr = 997 srp->header.usr_ptr; 998 } 999 } 1000 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1001 result = __copy_to_user(p, rinfo, 1002 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1003 result = result ? -EFAULT : 0; 1004 kfree(rinfo); 1005 return result; 1006 } 1007 case SG_EMULATED_HOST: 1008 if (sdp->detached) 1009 return -ENODEV; 1010 return put_user(sdp->device->host->hostt->emulated, ip); 1011 case SG_SCSI_RESET: 1012 if (sdp->detached) 1013 return -ENODEV; 1014 if (filp->f_flags & O_NONBLOCK) { 1015 if (scsi_host_in_recovery(sdp->device->host)) 1016 return -EBUSY; 1017 } else if (!scsi_block_when_processing_errors(sdp->device)) 1018 return -EBUSY; 1019 result = get_user(val, ip); 1020 if (result) 1021 return result; 1022 if (SG_SCSI_RESET_NOTHING == val) 1023 return 0; 1024 switch (val) { 1025 case SG_SCSI_RESET_DEVICE: 1026 val = SCSI_TRY_RESET_DEVICE; 1027 break; 1028 case SG_SCSI_RESET_TARGET: 1029 val = SCSI_TRY_RESET_TARGET; 1030 break; 1031 case SG_SCSI_RESET_BUS: 1032 val = SCSI_TRY_RESET_BUS; 1033 break; 1034 case SG_SCSI_RESET_HOST: 1035 val = SCSI_TRY_RESET_HOST; 1036 break; 1037 default: 1038 return -EINVAL; 1039 } 1040 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1041 return -EACCES; 1042 return (scsi_reset_provider(sdp->device, val) == 1043 SUCCESS) ? 0 : -EIO; 1044 case SCSI_IOCTL_SEND_COMMAND: 1045 if (sdp->detached) 1046 return -ENODEV; 1047 if (read_only) { 1048 unsigned char opcode = WRITE_6; 1049 Scsi_Ioctl_Command __user *siocp = p; 1050 1051 if (copy_from_user(&opcode, siocp->data, 1)) 1052 return -EFAULT; 1053 if (sg_allow_access(filp, &opcode)) 1054 return -EPERM; 1055 } 1056 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1057 case SG_SET_DEBUG: 1058 result = get_user(val, ip); 1059 if (result) 1060 return result; 1061 sdp->sgdebug = (char) val; 1062 return 0; 1063 case SCSI_IOCTL_GET_IDLUN: 1064 case SCSI_IOCTL_GET_BUS_NUMBER: 1065 case SCSI_IOCTL_PROBE_HOST: 1066 case SG_GET_TRANSFORM: 1067 if (sdp->detached) 1068 return -ENODEV; 1069 return scsi_ioctl(sdp->device, cmd_in, p); 1070 case BLKSECTGET: 1071 return put_user(queue_max_sectors(sdp->device->request_queue) * 512, 1072 ip); 1073 case BLKTRACESETUP: 1074 return blk_trace_setup(sdp->device->request_queue, 1075 sdp->disk->disk_name, 1076 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1077 NULL, 1078 (char *)arg); 1079 case BLKTRACESTART: 1080 return blk_trace_startstop(sdp->device->request_queue, 1); 1081 case BLKTRACESTOP: 1082 return blk_trace_startstop(sdp->device->request_queue, 0); 1083 case BLKTRACETEARDOWN: 1084 return blk_trace_remove(sdp->device->request_queue); 1085 default: 1086 if (read_only) 1087 return -EPERM; /* don't know so take safe approach */ 1088 return scsi_ioctl(sdp->device, cmd_in, p); 1089 } 1090 } 1091 1092 static long 1093 sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1094 { 1095 int ret; 1096 1097 mutex_lock(&sg_mutex); 1098 ret = sg_ioctl(filp, cmd_in, arg); 1099 mutex_unlock(&sg_mutex); 1100 1101 return ret; 1102 } 1103 1104 #ifdef CONFIG_COMPAT 1105 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1106 { 1107 Sg_device *sdp; 1108 Sg_fd *sfp; 1109 struct scsi_device *sdev; 1110 1111 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1112 return -ENXIO; 1113 1114 sdev = sdp->device; 1115 if (sdev->host->hostt->compat_ioctl) { 1116 int ret; 1117 1118 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1119 1120 return ret; 1121 } 1122 1123 return -ENOIOCTLCMD; 1124 } 1125 #endif 1126 1127 static unsigned int 1128 sg_poll(struct file *filp, poll_table * wait) 1129 { 1130 unsigned int res = 0; 1131 Sg_device *sdp; 1132 Sg_fd *sfp; 1133 Sg_request *srp; 1134 int count = 0; 1135 unsigned long iflags; 1136 1137 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp)) 1138 || sfp->closed) 1139 return POLLERR; 1140 poll_wait(filp, &sfp->read_wait, wait); 1141 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1142 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1143 /* if any read waiting, flag it */ 1144 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1145 res = POLLIN | POLLRDNORM; 1146 ++count; 1147 } 1148 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1149 1150 if (sdp->detached) 1151 res |= POLLHUP; 1152 else if (!sfp->cmd_q) { 1153 if (0 == count) 1154 res |= POLLOUT | POLLWRNORM; 1155 } else if (count < SG_MAX_QUEUE) 1156 res |= POLLOUT | POLLWRNORM; 1157 SCSI_LOG_TIMEOUT(3, printk("sg_poll: %s, res=0x%x\n", 1158 sdp->disk->disk_name, (int) res)); 1159 return res; 1160 } 1161 1162 static int 1163 sg_fasync(int fd, struct file *filp, int mode) 1164 { 1165 Sg_device *sdp; 1166 Sg_fd *sfp; 1167 1168 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1169 return -ENXIO; 1170 SCSI_LOG_TIMEOUT(3, printk("sg_fasync: %s, mode=%d\n", 1171 sdp->disk->disk_name, mode)); 1172 1173 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1174 } 1175 1176 static int 1177 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1178 { 1179 Sg_fd *sfp; 1180 unsigned long offset, len, sa; 1181 Sg_scatter_hold *rsv_schp; 1182 int k, length; 1183 1184 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1185 return VM_FAULT_SIGBUS; 1186 rsv_schp = &sfp->reserve; 1187 offset = vmf->pgoff << PAGE_SHIFT; 1188 if (offset >= rsv_schp->bufflen) 1189 return VM_FAULT_SIGBUS; 1190 SCSI_LOG_TIMEOUT(3, printk("sg_vma_fault: offset=%lu, scatg=%d\n", 1191 offset, rsv_schp->k_use_sg)); 1192 sa = vma->vm_start; 1193 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1194 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1195 len = vma->vm_end - sa; 1196 len = (len < length) ? len : length; 1197 if (offset < len) { 1198 struct page *page = nth_page(rsv_schp->pages[k], 1199 offset >> PAGE_SHIFT); 1200 get_page(page); /* increment page count */ 1201 vmf->page = page; 1202 return 0; /* success */ 1203 } 1204 sa += len; 1205 offset -= len; 1206 } 1207 1208 return VM_FAULT_SIGBUS; 1209 } 1210 1211 static const struct vm_operations_struct sg_mmap_vm_ops = { 1212 .fault = sg_vma_fault, 1213 }; 1214 1215 static int 1216 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1217 { 1218 Sg_fd *sfp; 1219 unsigned long req_sz, len, sa; 1220 Sg_scatter_hold *rsv_schp; 1221 int k, length; 1222 1223 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1224 return -ENXIO; 1225 req_sz = vma->vm_end - vma->vm_start; 1226 SCSI_LOG_TIMEOUT(3, printk("sg_mmap starting, vm_start=%p, len=%d\n", 1227 (void *) vma->vm_start, (int) req_sz)); 1228 if (vma->vm_pgoff) 1229 return -EINVAL; /* want no offset */ 1230 rsv_schp = &sfp->reserve; 1231 if (req_sz > rsv_schp->bufflen) 1232 return -ENOMEM; /* cannot map more than reserved buffer */ 1233 1234 sa = vma->vm_start; 1235 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1236 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1237 len = vma->vm_end - sa; 1238 len = (len < length) ? len : length; 1239 sa += len; 1240 } 1241 1242 sfp->mmap_called = 1; 1243 vma->vm_flags |= VM_RESERVED; 1244 vma->vm_private_data = sfp; 1245 vma->vm_ops = &sg_mmap_vm_ops; 1246 return 0; 1247 } 1248 1249 static void sg_rq_end_io_usercontext(struct work_struct *work) 1250 { 1251 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1252 struct sg_fd *sfp = srp->parentfp; 1253 1254 sg_finish_rem_req(srp); 1255 kref_put(&sfp->f_ref, sg_remove_sfp); 1256 } 1257 1258 /* 1259 * This function is a "bottom half" handler that is called by the mid 1260 * level when a command is completed (or has failed). 1261 */ 1262 static void sg_rq_end_io(struct request *rq, int uptodate) 1263 { 1264 struct sg_request *srp = rq->end_io_data; 1265 Sg_device *sdp; 1266 Sg_fd *sfp; 1267 unsigned long iflags; 1268 unsigned int ms; 1269 char *sense; 1270 int result, resid, done = 1; 1271 1272 if (WARN_ON(srp->done != 0)) 1273 return; 1274 1275 sfp = srp->parentfp; 1276 if (WARN_ON(sfp == NULL)) 1277 return; 1278 1279 sdp = sfp->parentdp; 1280 if (unlikely(sdp->detached)) 1281 printk(KERN_INFO "sg_rq_end_io: device detached\n"); 1282 1283 sense = rq->sense; 1284 result = rq->errors; 1285 resid = rq->resid_len; 1286 1287 SCSI_LOG_TIMEOUT(4, printk("sg_cmd_done: %s, pack_id=%d, res=0x%x\n", 1288 sdp->disk->disk_name, srp->header.pack_id, result)); 1289 srp->header.resid = resid; 1290 ms = jiffies_to_msecs(jiffies); 1291 srp->header.duration = (ms > srp->header.duration) ? 1292 (ms - srp->header.duration) : 0; 1293 if (0 != result) { 1294 struct scsi_sense_hdr sshdr; 1295 1296 srp->header.status = 0xff & result; 1297 srp->header.masked_status = status_byte(result); 1298 srp->header.msg_status = msg_byte(result); 1299 srp->header.host_status = host_byte(result); 1300 srp->header.driver_status = driver_byte(result); 1301 if ((sdp->sgdebug > 0) && 1302 ((CHECK_CONDITION == srp->header.masked_status) || 1303 (COMMAND_TERMINATED == srp->header.masked_status))) 1304 __scsi_print_sense("sg_cmd_done", sense, 1305 SCSI_SENSE_BUFFERSIZE); 1306 1307 /* Following if statement is a patch supplied by Eric Youngdale */ 1308 if (driver_byte(result) != 0 1309 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1310 && !scsi_sense_is_deferred(&sshdr) 1311 && sshdr.sense_key == UNIT_ATTENTION 1312 && sdp->device->removable) { 1313 /* Detected possible disc change. Set the bit - this */ 1314 /* may be used if there are filesystems using this device */ 1315 sdp->device->changed = 1; 1316 } 1317 } 1318 /* Rely on write phase to clean out srp status values, so no "else" */ 1319 1320 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1321 if (unlikely(srp->orphan)) { 1322 if (sfp->keep_orphan) 1323 srp->sg_io_owned = 0; 1324 else 1325 done = 0; 1326 } 1327 srp->done = done; 1328 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1329 1330 if (likely(done)) { 1331 /* Now wake up any sg_read() that is waiting for this 1332 * packet. 1333 */ 1334 wake_up_interruptible(&sfp->read_wait); 1335 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1336 kref_put(&sfp->f_ref, sg_remove_sfp); 1337 } else { 1338 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1339 schedule_work(&srp->ew.work); 1340 } 1341 } 1342 1343 static const struct file_operations sg_fops = { 1344 .owner = THIS_MODULE, 1345 .read = sg_read, 1346 .write = sg_write, 1347 .poll = sg_poll, 1348 .unlocked_ioctl = sg_unlocked_ioctl, 1349 #ifdef CONFIG_COMPAT 1350 .compat_ioctl = sg_compat_ioctl, 1351 #endif 1352 .open = sg_open, 1353 .mmap = sg_mmap, 1354 .release = sg_release, 1355 .fasync = sg_fasync, 1356 .llseek = no_llseek, 1357 }; 1358 1359 static struct class *sg_sysfs_class; 1360 1361 static int sg_sysfs_valid = 0; 1362 1363 static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1364 { 1365 struct request_queue *q = scsidp->request_queue; 1366 Sg_device *sdp; 1367 unsigned long iflags; 1368 int error; 1369 u32 k; 1370 1371 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1372 if (!sdp) { 1373 printk(KERN_WARNING "kmalloc Sg_device failure\n"); 1374 return ERR_PTR(-ENOMEM); 1375 } 1376 1377 if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) { 1378 printk(KERN_WARNING "idr expansion Sg_device failure\n"); 1379 error = -ENOMEM; 1380 goto out; 1381 } 1382 1383 write_lock_irqsave(&sg_index_lock, iflags); 1384 1385 error = idr_get_new(&sg_index_idr, sdp, &k); 1386 if (error) { 1387 write_unlock_irqrestore(&sg_index_lock, iflags); 1388 printk(KERN_WARNING "idr allocation Sg_device failure: %d\n", 1389 error); 1390 goto out; 1391 } 1392 1393 if (unlikely(k >= SG_MAX_DEVS)) 1394 goto overflow; 1395 1396 SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k)); 1397 sprintf(disk->disk_name, "sg%d", k); 1398 disk->first_minor = k; 1399 sdp->disk = disk; 1400 sdp->device = scsidp; 1401 INIT_LIST_HEAD(&sdp->sfds); 1402 init_waitqueue_head(&sdp->o_excl_wait); 1403 sdp->sg_tablesize = queue_max_segments(q); 1404 sdp->index = k; 1405 kref_init(&sdp->d_ref); 1406 1407 write_unlock_irqrestore(&sg_index_lock, iflags); 1408 1409 error = 0; 1410 out: 1411 if (error) { 1412 kfree(sdp); 1413 return ERR_PTR(error); 1414 } 1415 return sdp; 1416 1417 overflow: 1418 idr_remove(&sg_index_idr, k); 1419 write_unlock_irqrestore(&sg_index_lock, iflags); 1420 sdev_printk(KERN_WARNING, scsidp, 1421 "Unable to attach sg device type=%d, minor " 1422 "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1); 1423 error = -ENODEV; 1424 goto out; 1425 } 1426 1427 static int 1428 sg_add(struct device *cl_dev, struct class_interface *cl_intf) 1429 { 1430 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1431 struct gendisk *disk; 1432 Sg_device *sdp = NULL; 1433 struct cdev * cdev = NULL; 1434 int error; 1435 unsigned long iflags; 1436 1437 disk = alloc_disk(1); 1438 if (!disk) { 1439 printk(KERN_WARNING "alloc_disk failed\n"); 1440 return -ENOMEM; 1441 } 1442 disk->major = SCSI_GENERIC_MAJOR; 1443 1444 error = -ENOMEM; 1445 cdev = cdev_alloc(); 1446 if (!cdev) { 1447 printk(KERN_WARNING "cdev_alloc failed\n"); 1448 goto out; 1449 } 1450 cdev->owner = THIS_MODULE; 1451 cdev->ops = &sg_fops; 1452 1453 sdp = sg_alloc(disk, scsidp); 1454 if (IS_ERR(sdp)) { 1455 printk(KERN_WARNING "sg_alloc failed\n"); 1456 error = PTR_ERR(sdp); 1457 goto out; 1458 } 1459 1460 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1461 if (error) 1462 goto cdev_add_err; 1463 1464 sdp->cdev = cdev; 1465 if (sg_sysfs_valid) { 1466 struct device *sg_class_member; 1467 1468 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1469 MKDEV(SCSI_GENERIC_MAJOR, 1470 sdp->index), 1471 sdp, "%s", disk->disk_name); 1472 if (IS_ERR(sg_class_member)) { 1473 printk(KERN_ERR "sg_add: " 1474 "device_create failed\n"); 1475 error = PTR_ERR(sg_class_member); 1476 goto cdev_add_err; 1477 } 1478 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1479 &sg_class_member->kobj, "generic"); 1480 if (error) 1481 printk(KERN_ERR "sg_add: unable to make symlink " 1482 "'generic' back to sg%d\n", sdp->index); 1483 } else 1484 printk(KERN_WARNING "sg_add: sg_sys Invalid\n"); 1485 1486 sdev_printk(KERN_NOTICE, scsidp, 1487 "Attached scsi generic sg%d type %d\n", sdp->index, 1488 scsidp->type); 1489 1490 dev_set_drvdata(cl_dev, sdp); 1491 1492 return 0; 1493 1494 cdev_add_err: 1495 write_lock_irqsave(&sg_index_lock, iflags); 1496 idr_remove(&sg_index_idr, sdp->index); 1497 write_unlock_irqrestore(&sg_index_lock, iflags); 1498 kfree(sdp); 1499 1500 out: 1501 put_disk(disk); 1502 if (cdev) 1503 cdev_del(cdev); 1504 return error; 1505 } 1506 1507 static void sg_device_destroy(struct kref *kref) 1508 { 1509 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1510 unsigned long flags; 1511 1512 /* CAUTION! Note that the device can still be found via idr_find() 1513 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1514 * any other cleanup. 1515 */ 1516 1517 write_lock_irqsave(&sg_index_lock, flags); 1518 idr_remove(&sg_index_idr, sdp->index); 1519 write_unlock_irqrestore(&sg_index_lock, flags); 1520 1521 SCSI_LOG_TIMEOUT(3, 1522 printk("sg_device_destroy: %s\n", 1523 sdp->disk->disk_name)); 1524 1525 put_disk(sdp->disk); 1526 kfree(sdp); 1527 } 1528 1529 static void sg_remove(struct device *cl_dev, struct class_interface *cl_intf) 1530 { 1531 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1532 Sg_device *sdp = dev_get_drvdata(cl_dev); 1533 unsigned long iflags; 1534 Sg_fd *sfp; 1535 1536 if (!sdp || sdp->detached) 1537 return; 1538 1539 SCSI_LOG_TIMEOUT(3, printk("sg_remove: %s\n", sdp->disk->disk_name)); 1540 1541 /* Need a write lock to set sdp->detached. */ 1542 write_lock_irqsave(&sg_index_lock, iflags); 1543 sdp->detached = 1; 1544 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1545 wake_up_interruptible(&sfp->read_wait); 1546 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1547 } 1548 write_unlock_irqrestore(&sg_index_lock, iflags); 1549 1550 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1551 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1552 cdev_del(sdp->cdev); 1553 sdp->cdev = NULL; 1554 1555 sg_put_dev(sdp); 1556 } 1557 1558 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1559 module_param_named(def_reserved_size, def_reserved_size, int, 1560 S_IRUGO | S_IWUSR); 1561 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1562 1563 MODULE_AUTHOR("Douglas Gilbert"); 1564 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1565 MODULE_LICENSE("GPL"); 1566 MODULE_VERSION(SG_VERSION_STR); 1567 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1568 1569 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1570 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1571 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1572 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1573 1574 static int __init 1575 init_sg(void) 1576 { 1577 int rc; 1578 1579 if (scatter_elem_sz < PAGE_SIZE) { 1580 scatter_elem_sz = PAGE_SIZE; 1581 scatter_elem_sz_prev = scatter_elem_sz; 1582 } 1583 if (def_reserved_size >= 0) 1584 sg_big_buff = def_reserved_size; 1585 else 1586 def_reserved_size = sg_big_buff; 1587 1588 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1589 SG_MAX_DEVS, "sg"); 1590 if (rc) 1591 return rc; 1592 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1593 if ( IS_ERR(sg_sysfs_class) ) { 1594 rc = PTR_ERR(sg_sysfs_class); 1595 goto err_out; 1596 } 1597 sg_sysfs_valid = 1; 1598 rc = scsi_register_interface(&sg_interface); 1599 if (0 == rc) { 1600 #ifdef CONFIG_SCSI_PROC_FS 1601 sg_proc_init(); 1602 #endif /* CONFIG_SCSI_PROC_FS */ 1603 return 0; 1604 } 1605 class_destroy(sg_sysfs_class); 1606 err_out: 1607 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1608 return rc; 1609 } 1610 1611 static void __exit 1612 exit_sg(void) 1613 { 1614 #ifdef CONFIG_SCSI_PROC_FS 1615 sg_proc_cleanup(); 1616 #endif /* CONFIG_SCSI_PROC_FS */ 1617 scsi_unregister_interface(&sg_interface); 1618 class_destroy(sg_sysfs_class); 1619 sg_sysfs_valid = 0; 1620 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1621 SG_MAX_DEVS); 1622 idr_destroy(&sg_index_idr); 1623 } 1624 1625 static int sg_start_req(Sg_request *srp, unsigned char *cmd) 1626 { 1627 int res; 1628 struct request *rq; 1629 Sg_fd *sfp = srp->parentfp; 1630 sg_io_hdr_t *hp = &srp->header; 1631 int dxfer_len = (int) hp->dxfer_len; 1632 int dxfer_dir = hp->dxfer_direction; 1633 unsigned int iov_count = hp->iovec_count; 1634 Sg_scatter_hold *req_schp = &srp->data; 1635 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1636 struct request_queue *q = sfp->parentdp->device->request_queue; 1637 struct rq_map_data *md, map_data; 1638 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1639 1640 SCSI_LOG_TIMEOUT(4, printk(KERN_INFO "sg_start_req: dxfer_len=%d\n", 1641 dxfer_len)); 1642 1643 rq = blk_get_request(q, rw, GFP_ATOMIC); 1644 if (!rq) 1645 return -ENOMEM; 1646 1647 memcpy(rq->cmd, cmd, hp->cmd_len); 1648 1649 rq->cmd_len = hp->cmd_len; 1650 rq->cmd_type = REQ_TYPE_BLOCK_PC; 1651 1652 srp->rq = rq; 1653 rq->end_io_data = srp; 1654 rq->sense = srp->sense_b; 1655 rq->retries = SG_DEFAULT_RETRIES; 1656 1657 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1658 return 0; 1659 1660 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1661 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1662 !sfp->parentdp->device->host->unchecked_isa_dma && 1663 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1664 md = NULL; 1665 else 1666 md = &map_data; 1667 1668 if (md) { 1669 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1670 sg_link_reserve(sfp, srp, dxfer_len); 1671 else { 1672 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1673 if (res) 1674 return res; 1675 } 1676 1677 md->pages = req_schp->pages; 1678 md->page_order = req_schp->page_order; 1679 md->nr_entries = req_schp->k_use_sg; 1680 md->offset = 0; 1681 md->null_mapped = hp->dxferp ? 0 : 1; 1682 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1683 md->from_user = 1; 1684 else 1685 md->from_user = 0; 1686 } 1687 1688 if (iov_count) { 1689 int len, size = sizeof(struct sg_iovec) * iov_count; 1690 struct iovec *iov; 1691 1692 iov = memdup_user(hp->dxferp, size); 1693 if (IS_ERR(iov)) 1694 return PTR_ERR(iov); 1695 1696 len = iov_length(iov, iov_count); 1697 if (hp->dxfer_len < len) { 1698 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1699 len = hp->dxfer_len; 1700 } 1701 1702 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1703 iov_count, 1704 len, GFP_ATOMIC); 1705 kfree(iov); 1706 } else 1707 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1708 hp->dxfer_len, GFP_ATOMIC); 1709 1710 if (!res) { 1711 srp->bio = rq->bio; 1712 1713 if (!md) { 1714 req_schp->dio_in_use = 1; 1715 hp->info |= SG_INFO_DIRECT_IO; 1716 } 1717 } 1718 return res; 1719 } 1720 1721 static int sg_finish_rem_req(Sg_request * srp) 1722 { 1723 int ret = 0; 1724 1725 Sg_fd *sfp = srp->parentfp; 1726 Sg_scatter_hold *req_schp = &srp->data; 1727 1728 SCSI_LOG_TIMEOUT(4, printk("sg_finish_rem_req: res_used=%d\n", (int) srp->res_used)); 1729 if (srp->rq) { 1730 if (srp->bio) 1731 ret = blk_rq_unmap_user(srp->bio); 1732 1733 blk_put_request(srp->rq); 1734 } 1735 1736 if (srp->res_used) 1737 sg_unlink_reserve(sfp, srp); 1738 else 1739 sg_remove_scat(req_schp); 1740 1741 sg_remove_request(sfp, srp); 1742 1743 return ret; 1744 } 1745 1746 static int 1747 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1748 { 1749 int sg_bufflen = tablesize * sizeof(struct page *); 1750 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1751 1752 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1753 if (!schp->pages) 1754 return -ENOMEM; 1755 schp->sglist_len = sg_bufflen; 1756 return tablesize; /* number of scat_gath elements allocated */ 1757 } 1758 1759 static int 1760 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1761 { 1762 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1763 int sg_tablesize = sfp->parentdp->sg_tablesize; 1764 int blk_size = buff_size, order; 1765 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1766 1767 if (blk_size < 0) 1768 return -EFAULT; 1769 if (0 == blk_size) 1770 ++blk_size; /* don't know why */ 1771 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1772 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1773 SCSI_LOG_TIMEOUT(4, printk("sg_build_indirect: buff_size=%d, blk_size=%d\n", 1774 buff_size, blk_size)); 1775 1776 /* N.B. ret_sz carried into this block ... */ 1777 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1778 if (mx_sc_elems < 0) 1779 return mx_sc_elems; /* most likely -ENOMEM */ 1780 1781 num = scatter_elem_sz; 1782 if (unlikely(num != scatter_elem_sz_prev)) { 1783 if (num < PAGE_SIZE) { 1784 scatter_elem_sz = PAGE_SIZE; 1785 scatter_elem_sz_prev = PAGE_SIZE; 1786 } else 1787 scatter_elem_sz_prev = num; 1788 } 1789 1790 if (sfp->low_dma) 1791 gfp_mask |= GFP_DMA; 1792 1793 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1794 gfp_mask |= __GFP_ZERO; 1795 1796 order = get_order(num); 1797 retry: 1798 ret_sz = 1 << (PAGE_SHIFT + order); 1799 1800 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1801 k++, rem_sz -= ret_sz) { 1802 1803 num = (rem_sz > scatter_elem_sz_prev) ? 1804 scatter_elem_sz_prev : rem_sz; 1805 1806 schp->pages[k] = alloc_pages(gfp_mask, order); 1807 if (!schp->pages[k]) 1808 goto out; 1809 1810 if (num == scatter_elem_sz_prev) { 1811 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1812 scatter_elem_sz = ret_sz; 1813 scatter_elem_sz_prev = ret_sz; 1814 } 1815 } 1816 1817 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k=%d, num=%d, " 1818 "ret_sz=%d\n", k, num, ret_sz)); 1819 } /* end of for loop */ 1820 1821 schp->page_order = order; 1822 schp->k_use_sg = k; 1823 SCSI_LOG_TIMEOUT(5, printk("sg_build_indirect: k_use_sg=%d, " 1824 "rem_sz=%d\n", k, rem_sz)); 1825 1826 schp->bufflen = blk_size; 1827 if (rem_sz > 0) /* must have failed */ 1828 return -ENOMEM; 1829 return 0; 1830 out: 1831 for (i = 0; i < k; i++) 1832 __free_pages(schp->pages[i], order); 1833 1834 if (--order >= 0) 1835 goto retry; 1836 1837 return -ENOMEM; 1838 } 1839 1840 static void 1841 sg_remove_scat(Sg_scatter_hold * schp) 1842 { 1843 SCSI_LOG_TIMEOUT(4, printk("sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1844 if (schp->pages && schp->sglist_len > 0) { 1845 if (!schp->dio_in_use) { 1846 int k; 1847 1848 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1849 SCSI_LOG_TIMEOUT(5, printk( 1850 "sg_remove_scat: k=%d, pg=0x%p\n", 1851 k, schp->pages[k])); 1852 __free_pages(schp->pages[k], schp->page_order); 1853 } 1854 1855 kfree(schp->pages); 1856 } 1857 } 1858 memset(schp, 0, sizeof (*schp)); 1859 } 1860 1861 static int 1862 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1863 { 1864 Sg_scatter_hold *schp = &srp->data; 1865 int k, num; 1866 1867 SCSI_LOG_TIMEOUT(4, printk("sg_read_oxfer: num_read_xfer=%d\n", 1868 num_read_xfer)); 1869 if ((!outp) || (num_read_xfer <= 0)) 1870 return 0; 1871 1872 num = 1 << (PAGE_SHIFT + schp->page_order); 1873 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1874 if (num > num_read_xfer) { 1875 if (__copy_to_user(outp, page_address(schp->pages[k]), 1876 num_read_xfer)) 1877 return -EFAULT; 1878 break; 1879 } else { 1880 if (__copy_to_user(outp, page_address(schp->pages[k]), 1881 num)) 1882 return -EFAULT; 1883 num_read_xfer -= num; 1884 if (num_read_xfer <= 0) 1885 break; 1886 outp += num; 1887 } 1888 } 1889 1890 return 0; 1891 } 1892 1893 static void 1894 sg_build_reserve(Sg_fd * sfp, int req_size) 1895 { 1896 Sg_scatter_hold *schp = &sfp->reserve; 1897 1898 SCSI_LOG_TIMEOUT(4, printk("sg_build_reserve: req_size=%d\n", req_size)); 1899 do { 1900 if (req_size < PAGE_SIZE) 1901 req_size = PAGE_SIZE; 1902 if (0 == sg_build_indirect(schp, sfp, req_size)) 1903 return; 1904 else 1905 sg_remove_scat(schp); 1906 req_size >>= 1; /* divide by 2 */ 1907 } while (req_size > (PAGE_SIZE / 2)); 1908 } 1909 1910 static void 1911 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1912 { 1913 Sg_scatter_hold *req_schp = &srp->data; 1914 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1915 int k, num, rem; 1916 1917 srp->res_used = 1; 1918 SCSI_LOG_TIMEOUT(4, printk("sg_link_reserve: size=%d\n", size)); 1919 rem = size; 1920 1921 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1922 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1923 if (rem <= num) { 1924 req_schp->k_use_sg = k + 1; 1925 req_schp->sglist_len = rsv_schp->sglist_len; 1926 req_schp->pages = rsv_schp->pages; 1927 1928 req_schp->bufflen = size; 1929 req_schp->page_order = rsv_schp->page_order; 1930 break; 1931 } else 1932 rem -= num; 1933 } 1934 1935 if (k >= rsv_schp->k_use_sg) 1936 SCSI_LOG_TIMEOUT(1, printk("sg_link_reserve: BAD size\n")); 1937 } 1938 1939 static void 1940 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 1941 { 1942 Sg_scatter_hold *req_schp = &srp->data; 1943 1944 SCSI_LOG_TIMEOUT(4, printk("sg_unlink_reserve: req->k_use_sg=%d\n", 1945 (int) req_schp->k_use_sg)); 1946 req_schp->k_use_sg = 0; 1947 req_schp->bufflen = 0; 1948 req_schp->pages = NULL; 1949 req_schp->page_order = 0; 1950 req_schp->sglist_len = 0; 1951 sfp->save_scat_len = 0; 1952 srp->res_used = 0; 1953 } 1954 1955 static Sg_request * 1956 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 1957 { 1958 Sg_request *resp; 1959 unsigned long iflags; 1960 1961 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1962 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 1963 /* look for requests that are ready + not SG_IO owned */ 1964 if ((1 == resp->done) && (!resp->sg_io_owned) && 1965 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 1966 resp->done = 2; /* guard against other readers */ 1967 break; 1968 } 1969 } 1970 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1971 return resp; 1972 } 1973 1974 /* always adds to end of list */ 1975 static Sg_request * 1976 sg_add_request(Sg_fd * sfp) 1977 { 1978 int k; 1979 unsigned long iflags; 1980 Sg_request *resp; 1981 Sg_request *rp = sfp->req_arr; 1982 1983 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1984 resp = sfp->headrp; 1985 if (!resp) { 1986 memset(rp, 0, sizeof (Sg_request)); 1987 rp->parentfp = sfp; 1988 resp = rp; 1989 sfp->headrp = resp; 1990 } else { 1991 if (0 == sfp->cmd_q) 1992 resp = NULL; /* command queuing disallowed */ 1993 else { 1994 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 1995 if (!rp->parentfp) 1996 break; 1997 } 1998 if (k < SG_MAX_QUEUE) { 1999 memset(rp, 0, sizeof (Sg_request)); 2000 rp->parentfp = sfp; 2001 while (resp->nextrp) 2002 resp = resp->nextrp; 2003 resp->nextrp = rp; 2004 resp = rp; 2005 } else 2006 resp = NULL; 2007 } 2008 } 2009 if (resp) { 2010 resp->nextrp = NULL; 2011 resp->header.duration = jiffies_to_msecs(jiffies); 2012 } 2013 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2014 return resp; 2015 } 2016 2017 /* Return of 1 for found; 0 for not found */ 2018 static int 2019 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2020 { 2021 Sg_request *prev_rp; 2022 Sg_request *rp; 2023 unsigned long iflags; 2024 int res = 0; 2025 2026 if ((!sfp) || (!srp) || (!sfp->headrp)) 2027 return res; 2028 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2029 prev_rp = sfp->headrp; 2030 if (srp == prev_rp) { 2031 sfp->headrp = prev_rp->nextrp; 2032 prev_rp->parentfp = NULL; 2033 res = 1; 2034 } else { 2035 while ((rp = prev_rp->nextrp)) { 2036 if (srp == rp) { 2037 prev_rp->nextrp = rp->nextrp; 2038 rp->parentfp = NULL; 2039 res = 1; 2040 break; 2041 } 2042 prev_rp = rp; 2043 } 2044 } 2045 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2046 return res; 2047 } 2048 2049 static Sg_fd * 2050 sg_add_sfp(Sg_device * sdp, int dev) 2051 { 2052 Sg_fd *sfp; 2053 unsigned long iflags; 2054 int bufflen; 2055 2056 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2057 if (!sfp) 2058 return NULL; 2059 2060 init_waitqueue_head(&sfp->read_wait); 2061 rwlock_init(&sfp->rq_list_lock); 2062 2063 kref_init(&sfp->f_ref); 2064 sfp->timeout = SG_DEFAULT_TIMEOUT; 2065 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2066 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2067 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2068 sdp->device->host->unchecked_isa_dma : 1; 2069 sfp->cmd_q = SG_DEF_COMMAND_Q; 2070 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2071 sfp->parentdp = sdp; 2072 write_lock_irqsave(&sg_index_lock, iflags); 2073 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2074 write_unlock_irqrestore(&sg_index_lock, iflags); 2075 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: sfp=0x%p\n", sfp)); 2076 if (unlikely(sg_big_buff != def_reserved_size)) 2077 sg_big_buff = def_reserved_size; 2078 2079 bufflen = min_t(int, sg_big_buff, 2080 queue_max_sectors(sdp->device->request_queue) * 512); 2081 sg_build_reserve(sfp, bufflen); 2082 SCSI_LOG_TIMEOUT(3, printk("sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2083 sfp->reserve.bufflen, sfp->reserve.k_use_sg)); 2084 2085 kref_get(&sdp->d_ref); 2086 __module_get(THIS_MODULE); 2087 return sfp; 2088 } 2089 2090 static void sg_remove_sfp_usercontext(struct work_struct *work) 2091 { 2092 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2093 struct sg_device *sdp = sfp->parentdp; 2094 2095 /* Cleanup any responses which were never read(). */ 2096 while (sfp->headrp) 2097 sg_finish_rem_req(sfp->headrp); 2098 2099 if (sfp->reserve.bufflen > 0) { 2100 SCSI_LOG_TIMEOUT(6, 2101 printk("sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2102 (int) sfp->reserve.bufflen, 2103 (int) sfp->reserve.k_use_sg)); 2104 sg_remove_scat(&sfp->reserve); 2105 } 2106 2107 SCSI_LOG_TIMEOUT(6, 2108 printk("sg_remove_sfp: %s, sfp=0x%p\n", 2109 sdp->disk->disk_name, 2110 sfp)); 2111 kfree(sfp); 2112 2113 scsi_device_put(sdp->device); 2114 sg_put_dev(sdp); 2115 module_put(THIS_MODULE); 2116 } 2117 2118 static void sg_remove_sfp(struct kref *kref) 2119 { 2120 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2121 struct sg_device *sdp = sfp->parentdp; 2122 unsigned long iflags; 2123 2124 write_lock_irqsave(&sg_index_lock, iflags); 2125 list_del(&sfp->sfd_siblings); 2126 write_unlock_irqrestore(&sg_index_lock, iflags); 2127 wake_up_interruptible(&sdp->o_excl_wait); 2128 2129 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2130 schedule_work(&sfp->ew.work); 2131 } 2132 2133 static int 2134 sg_res_in_use(Sg_fd * sfp) 2135 { 2136 const Sg_request *srp; 2137 unsigned long iflags; 2138 2139 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2140 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2141 if (srp->res_used) 2142 break; 2143 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2144 return srp ? 1 : 0; 2145 } 2146 2147 #ifdef CONFIG_SCSI_PROC_FS 2148 static int 2149 sg_idr_max_id(int id, void *p, void *data) 2150 { 2151 int *k = data; 2152 2153 if (*k < id) 2154 *k = id; 2155 2156 return 0; 2157 } 2158 2159 static int 2160 sg_last_dev(void) 2161 { 2162 int k = -1; 2163 unsigned long iflags; 2164 2165 read_lock_irqsave(&sg_index_lock, iflags); 2166 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2167 read_unlock_irqrestore(&sg_index_lock, iflags); 2168 return k + 1; /* origin 1 */ 2169 } 2170 #endif 2171 2172 /* must be called with sg_index_lock held */ 2173 static Sg_device *sg_lookup_dev(int dev) 2174 { 2175 return idr_find(&sg_index_idr, dev); 2176 } 2177 2178 static Sg_device *sg_get_dev(int dev) 2179 { 2180 struct sg_device *sdp; 2181 unsigned long flags; 2182 2183 read_lock_irqsave(&sg_index_lock, flags); 2184 sdp = sg_lookup_dev(dev); 2185 if (!sdp) 2186 sdp = ERR_PTR(-ENXIO); 2187 else if (sdp->detached) { 2188 /* If sdp->detached, then the refcount may already be 0, in 2189 * which case it would be a bug to do kref_get(). 2190 */ 2191 sdp = ERR_PTR(-ENODEV); 2192 } else 2193 kref_get(&sdp->d_ref); 2194 read_unlock_irqrestore(&sg_index_lock, flags); 2195 2196 return sdp; 2197 } 2198 2199 static void sg_put_dev(struct sg_device *sdp) 2200 { 2201 kref_put(&sdp->d_ref, sg_device_destroy); 2202 } 2203 2204 #ifdef CONFIG_SCSI_PROC_FS 2205 2206 static struct proc_dir_entry *sg_proc_sgp = NULL; 2207 2208 static char sg_proc_sg_dirname[] = "scsi/sg"; 2209 2210 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2211 2212 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2213 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2214 size_t count, loff_t *off); 2215 static const struct file_operations adio_fops = { 2216 .owner = THIS_MODULE, 2217 .open = sg_proc_single_open_adio, 2218 .read = seq_read, 2219 .llseek = seq_lseek, 2220 .write = sg_proc_write_adio, 2221 .release = single_release, 2222 }; 2223 2224 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2225 static ssize_t sg_proc_write_dressz(struct file *filp, 2226 const char __user *buffer, size_t count, loff_t *off); 2227 static const struct file_operations dressz_fops = { 2228 .owner = THIS_MODULE, 2229 .open = sg_proc_single_open_dressz, 2230 .read = seq_read, 2231 .llseek = seq_lseek, 2232 .write = sg_proc_write_dressz, 2233 .release = single_release, 2234 }; 2235 2236 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2237 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2238 static const struct file_operations version_fops = { 2239 .owner = THIS_MODULE, 2240 .open = sg_proc_single_open_version, 2241 .read = seq_read, 2242 .llseek = seq_lseek, 2243 .release = single_release, 2244 }; 2245 2246 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2247 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2248 static const struct file_operations devhdr_fops = { 2249 .owner = THIS_MODULE, 2250 .open = sg_proc_single_open_devhdr, 2251 .read = seq_read, 2252 .llseek = seq_lseek, 2253 .release = single_release, 2254 }; 2255 2256 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2257 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2258 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2259 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2260 static void dev_seq_stop(struct seq_file *s, void *v); 2261 static const struct file_operations dev_fops = { 2262 .owner = THIS_MODULE, 2263 .open = sg_proc_open_dev, 2264 .read = seq_read, 2265 .llseek = seq_lseek, 2266 .release = seq_release, 2267 }; 2268 static const struct seq_operations dev_seq_ops = { 2269 .start = dev_seq_start, 2270 .next = dev_seq_next, 2271 .stop = dev_seq_stop, 2272 .show = sg_proc_seq_show_dev, 2273 }; 2274 2275 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2276 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2277 static const struct file_operations devstrs_fops = { 2278 .owner = THIS_MODULE, 2279 .open = sg_proc_open_devstrs, 2280 .read = seq_read, 2281 .llseek = seq_lseek, 2282 .release = seq_release, 2283 }; 2284 static const struct seq_operations devstrs_seq_ops = { 2285 .start = dev_seq_start, 2286 .next = dev_seq_next, 2287 .stop = dev_seq_stop, 2288 .show = sg_proc_seq_show_devstrs, 2289 }; 2290 2291 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2292 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2293 static const struct file_operations debug_fops = { 2294 .owner = THIS_MODULE, 2295 .open = sg_proc_open_debug, 2296 .read = seq_read, 2297 .llseek = seq_lseek, 2298 .release = seq_release, 2299 }; 2300 static const struct seq_operations debug_seq_ops = { 2301 .start = dev_seq_start, 2302 .next = dev_seq_next, 2303 .stop = dev_seq_stop, 2304 .show = sg_proc_seq_show_debug, 2305 }; 2306 2307 2308 struct sg_proc_leaf { 2309 const char * name; 2310 const struct file_operations * fops; 2311 }; 2312 2313 static struct sg_proc_leaf sg_proc_leaf_arr[] = { 2314 {"allow_dio", &adio_fops}, 2315 {"debug", &debug_fops}, 2316 {"def_reserved_size", &dressz_fops}, 2317 {"device_hdr", &devhdr_fops}, 2318 {"devices", &dev_fops}, 2319 {"device_strs", &devstrs_fops}, 2320 {"version", &version_fops} 2321 }; 2322 2323 static int 2324 sg_proc_init(void) 2325 { 2326 int k, mask; 2327 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2328 struct sg_proc_leaf * leaf; 2329 2330 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2331 if (!sg_proc_sgp) 2332 return 1; 2333 for (k = 0; k < num_leaves; ++k) { 2334 leaf = &sg_proc_leaf_arr[k]; 2335 mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2336 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2337 } 2338 return 0; 2339 } 2340 2341 static void 2342 sg_proc_cleanup(void) 2343 { 2344 int k; 2345 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2346 2347 if (!sg_proc_sgp) 2348 return; 2349 for (k = 0; k < num_leaves; ++k) 2350 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2351 remove_proc_entry(sg_proc_sg_dirname, NULL); 2352 } 2353 2354 2355 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2356 { 2357 seq_printf(s, "%d\n", *((int *)s->private)); 2358 return 0; 2359 } 2360 2361 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2362 { 2363 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2364 } 2365 2366 static ssize_t 2367 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2368 size_t count, loff_t *off) 2369 { 2370 int num; 2371 char buff[11]; 2372 2373 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2374 return -EACCES; 2375 num = (count < 10) ? count : 10; 2376 if (copy_from_user(buff, buffer, num)) 2377 return -EFAULT; 2378 buff[num] = '\0'; 2379 sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 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 num; 2393 unsigned long k = ULONG_MAX; 2394 char buff[11]; 2395 2396 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2397 return -EACCES; 2398 num = (count < 10) ? count : 10; 2399 if (copy_from_user(buff, buffer, num)) 2400 return -EFAULT; 2401 buff[num] = '\0'; 2402 k = simple_strtoul(buff, NULL, 10); 2403 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2404 sg_big_buff = k; 2405 return count; 2406 } 2407 return -ERANGE; 2408 } 2409 2410 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2411 { 2412 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2413 sg_version_date); 2414 return 0; 2415 } 2416 2417 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2418 { 2419 return single_open(file, sg_proc_seq_show_version, NULL); 2420 } 2421 2422 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2423 { 2424 seq_printf(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\t" 2425 "online\n"); 2426 return 0; 2427 } 2428 2429 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2430 { 2431 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2432 } 2433 2434 struct sg_proc_deviter { 2435 loff_t index; 2436 size_t max; 2437 }; 2438 2439 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2440 { 2441 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2442 2443 s->private = it; 2444 if (! it) 2445 return NULL; 2446 2447 it->index = *pos; 2448 it->max = sg_last_dev(); 2449 if (it->index >= it->max) 2450 return NULL; 2451 return it; 2452 } 2453 2454 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2455 { 2456 struct sg_proc_deviter * it = s->private; 2457 2458 *pos = ++it->index; 2459 return (it->index < it->max) ? it : NULL; 2460 } 2461 2462 static void dev_seq_stop(struct seq_file *s, void *v) 2463 { 2464 kfree(s->private); 2465 } 2466 2467 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2468 { 2469 return seq_open(file, &dev_seq_ops); 2470 } 2471 2472 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2473 { 2474 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2475 Sg_device *sdp; 2476 struct scsi_device *scsidp; 2477 unsigned long iflags; 2478 2479 read_lock_irqsave(&sg_index_lock, iflags); 2480 sdp = it ? sg_lookup_dev(it->index) : NULL; 2481 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2482 seq_printf(s, "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\n", 2483 scsidp->host->host_no, scsidp->channel, 2484 scsidp->id, scsidp->lun, (int) scsidp->type, 2485 1, 2486 (int) scsidp->queue_depth, 2487 (int) scsidp->device_busy, 2488 (int) scsi_device_online(scsidp)); 2489 else 2490 seq_printf(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2491 read_unlock_irqrestore(&sg_index_lock, iflags); 2492 return 0; 2493 } 2494 2495 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2496 { 2497 return seq_open(file, &devstrs_seq_ops); 2498 } 2499 2500 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2501 { 2502 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2503 Sg_device *sdp; 2504 struct scsi_device *scsidp; 2505 unsigned long iflags; 2506 2507 read_lock_irqsave(&sg_index_lock, iflags); 2508 sdp = it ? sg_lookup_dev(it->index) : NULL; 2509 if (sdp && (scsidp = sdp->device) && (!sdp->detached)) 2510 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2511 scsidp->vendor, scsidp->model, scsidp->rev); 2512 else 2513 seq_printf(s, "<no active device>\n"); 2514 read_unlock_irqrestore(&sg_index_lock, iflags); 2515 return 0; 2516 } 2517 2518 /* must be called while holding sg_index_lock */ 2519 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2520 { 2521 int k, m, new_interface, blen, usg; 2522 Sg_request *srp; 2523 Sg_fd *fp; 2524 const sg_io_hdr_t *hp; 2525 const char * cp; 2526 unsigned int ms; 2527 2528 k = 0; 2529 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2530 k++; 2531 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2532 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2533 "(res)sgat=%d low_dma=%d\n", k, 2534 jiffies_to_msecs(fp->timeout), 2535 fp->reserve.bufflen, 2536 (int) fp->reserve.k_use_sg, 2537 (int) fp->low_dma); 2538 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=%d\n", 2539 (int) fp->cmd_q, (int) fp->force_packid, 2540 (int) fp->keep_orphan, (int) fp->closed); 2541 for (m = 0, srp = fp->headrp; 2542 srp != NULL; 2543 ++m, srp = srp->nextrp) { 2544 hp = &srp->header; 2545 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2546 if (srp->res_used) { 2547 if (new_interface && 2548 (SG_FLAG_MMAP_IO & hp->flags)) 2549 cp = " mmap>> "; 2550 else 2551 cp = " rb>> "; 2552 } else { 2553 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2554 cp = " dio>> "; 2555 else 2556 cp = " "; 2557 } 2558 seq_printf(s, cp); 2559 blen = srp->data.bufflen; 2560 usg = srp->data.k_use_sg; 2561 seq_printf(s, srp->done ? 2562 ((1 == srp->done) ? "rcv:" : "fin:") 2563 : "act:"); 2564 seq_printf(s, " id=%d blen=%d", 2565 srp->header.pack_id, blen); 2566 if (srp->done) 2567 seq_printf(s, " dur=%d", hp->duration); 2568 else { 2569 ms = jiffies_to_msecs(jiffies); 2570 seq_printf(s, " t_o/elap=%d/%d", 2571 (new_interface ? hp->timeout : 2572 jiffies_to_msecs(fp->timeout)), 2573 (ms > hp->duration ? ms - hp->duration : 0)); 2574 } 2575 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2576 (int) srp->data.cmd_opcode); 2577 } 2578 if (0 == m) 2579 seq_printf(s, " No requests active\n"); 2580 read_unlock(&fp->rq_list_lock); 2581 } 2582 } 2583 2584 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2585 { 2586 return seq_open(file, &debug_seq_ops); 2587 } 2588 2589 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2590 { 2591 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2592 Sg_device *sdp; 2593 unsigned long iflags; 2594 2595 if (it && (0 == it->index)) { 2596 seq_printf(s, "max_active_device=%d(origin 1)\n", 2597 (int)it->max); 2598 seq_printf(s, " def_reserved_size=%d\n", sg_big_buff); 2599 } 2600 2601 read_lock_irqsave(&sg_index_lock, iflags); 2602 sdp = it ? sg_lookup_dev(it->index) : NULL; 2603 if (sdp && !list_empty(&sdp->sfds)) { 2604 struct scsi_device *scsidp = sdp->device; 2605 2606 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2607 if (sdp->detached) 2608 seq_printf(s, "detached pending close "); 2609 else 2610 seq_printf 2611 (s, "scsi%d chan=%d id=%d lun=%d em=%d", 2612 scsidp->host->host_no, 2613 scsidp->channel, scsidp->id, 2614 scsidp->lun, 2615 scsidp->host->hostt->emulated); 2616 seq_printf(s, " sg_tablesize=%d excl=%d\n", 2617 sdp->sg_tablesize, sdp->exclude); 2618 sg_proc_debug_helper(s, sdp); 2619 } 2620 read_unlock_irqrestore(&sg_index_lock, iflags); 2621 return 0; 2622 } 2623 2624 #endif /* CONFIG_SCSI_PROC_FS */ 2625 2626 module_init(init_sg); 2627 module_exit(exit_sg); 2628