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