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 - 2014 Douglas Gilbert 11 * 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2, or (at your option) 15 * any later version. 16 * 17 */ 18 19 static int sg_version_num = 30536; /* 2 digits for each component */ 20 #define SG_VERSION_STR "3.5.36" 21 22 /* 23 * D. P. Gilbert (dgilbert@interlog.com), notes: 24 * - scsi logging is available via SCSI_LOG_TIMEOUT macros. First 25 * the kernel/module needs to be built with CONFIG_SCSI_LOGGING 26 * (otherwise the macros compile to empty statements). 27 * 28 */ 29 #include <linux/module.h> 30 31 #include <linux/fs.h> 32 #include <linux/kernel.h> 33 #include <linux/sched.h> 34 #include <linux/string.h> 35 #include <linux/mm.h> 36 #include <linux/aio.h> 37 #include <linux/errno.h> 38 #include <linux/mtio.h> 39 #include <linux/ioctl.h> 40 #include <linux/slab.h> 41 #include <linux/fcntl.h> 42 #include <linux/init.h> 43 #include <linux/poll.h> 44 #include <linux/moduleparam.h> 45 #include <linux/cdev.h> 46 #include <linux/idr.h> 47 #include <linux/seq_file.h> 48 #include <linux/blkdev.h> 49 #include <linux/delay.h> 50 #include <linux/blktrace_api.h> 51 #include <linux/mutex.h> 52 #include <linux/atomic.h> 53 #include <linux/ratelimit.h> 54 55 #include "scsi.h" 56 #include <scsi/scsi_dbg.h> 57 #include <scsi/scsi_host.h> 58 #include <scsi/scsi_driver.h> 59 #include <scsi/scsi_ioctl.h> 60 #include <scsi/sg.h> 61 62 #include "scsi_logging.h" 63 64 #ifdef CONFIG_SCSI_PROC_FS 65 #include <linux/proc_fs.h> 66 static char *sg_version_date = "20140603"; 67 68 static int sg_proc_init(void); 69 static void sg_proc_cleanup(void); 70 #endif 71 72 #define SG_ALLOW_DIO_DEF 0 73 74 #define SG_MAX_DEVS 32768 75 76 /* SG_MAX_CDB_SIZE should be 260 (spc4r37 section 3.1.30) however the type 77 * of sg_io_hdr::cmd_len can only represent 255. All SCSI commands greater 78 * than 16 bytes are "variable length" whose length is a multiple of 4 79 */ 80 #define SG_MAX_CDB_SIZE 252 81 82 /* 83 * Suppose you want to calculate the formula muldiv(x,m,d)=int(x * m / d) 84 * Then when using 32 bit integers x * m may overflow during the calculation. 85 * Replacing muldiv(x) by muldiv(x)=((x % d) * m) / d + int(x / d) * m 86 * calculates the same, but prevents the overflow when both m and d 87 * are "small" numbers (like HZ and USER_HZ). 88 * Of course an overflow is inavoidable if the result of muldiv doesn't fit 89 * in 32 bits. 90 */ 91 #define MULDIV(X,MUL,DIV) ((((X % DIV) * MUL) / DIV) + ((X / DIV) * MUL)) 92 93 #define SG_DEFAULT_TIMEOUT MULDIV(SG_DEFAULT_TIMEOUT_USER, HZ, USER_HZ) 94 95 int sg_big_buff = SG_DEF_RESERVED_SIZE; 96 /* N.B. This variable is readable and writeable via 97 /proc/scsi/sg/def_reserved_size . Each time sg_open() is called a buffer 98 of this size (or less if there is not enough memory) will be reserved 99 for use by this file descriptor. [Deprecated usage: this variable is also 100 readable via /proc/sys/kernel/sg-big-buff if the sg driver is built into 101 the kernel (i.e. it is not a module).] */ 102 static int def_reserved_size = -1; /* picks up init parameter */ 103 static int sg_allow_dio = SG_ALLOW_DIO_DEF; 104 105 static int scatter_elem_sz = SG_SCATTER_SZ; 106 static int scatter_elem_sz_prev = SG_SCATTER_SZ; 107 108 #define SG_SECTOR_SZ 512 109 110 static int sg_add_device(struct device *, struct class_interface *); 111 static void sg_remove_device(struct device *, struct class_interface *); 112 113 static DEFINE_IDR(sg_index_idr); 114 static DEFINE_RWLOCK(sg_index_lock); /* Also used to lock 115 file descriptor list for device */ 116 117 static struct class_interface sg_interface = { 118 .add_dev = sg_add_device, 119 .remove_dev = sg_remove_device, 120 }; 121 122 typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */ 123 unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */ 124 unsigned sglist_len; /* size of malloc'd scatter-gather list ++ */ 125 unsigned bufflen; /* Size of (aggregate) data buffer */ 126 struct page **pages; 127 int page_order; 128 char dio_in_use; /* 0->indirect IO (or mmap), 1->dio */ 129 unsigned char cmd_opcode; /* first byte of command */ 130 } Sg_scatter_hold; 131 132 struct sg_device; /* forward declarations */ 133 struct sg_fd; 134 135 typedef struct sg_request { /* SG_MAX_QUEUE requests outstanding per file */ 136 struct sg_request *nextrp; /* NULL -> tail request (slist) */ 137 struct sg_fd *parentfp; /* NULL -> not in use */ 138 Sg_scatter_hold data; /* hold buffer, perhaps scatter list */ 139 sg_io_hdr_t header; /* scsi command+info, see <scsi/sg.h> */ 140 unsigned char sense_b[SCSI_SENSE_BUFFERSIZE]; 141 char res_used; /* 1 -> using reserve buffer, 0 -> not ... */ 142 char orphan; /* 1 -> drop on sight, 0 -> normal */ 143 char sg_io_owned; /* 1 -> packet belongs to SG_IO */ 144 /* done protected by rq_list_lock */ 145 char done; /* 0->before bh, 1->before read, 2->read */ 146 struct request *rq; 147 struct bio *bio; 148 struct execute_work ew; 149 } Sg_request; 150 151 typedef struct sg_fd { /* holds the state of a file descriptor */ 152 struct list_head sfd_siblings; /* protected by device's sfd_lock */ 153 struct sg_device *parentdp; /* owning device */ 154 wait_queue_head_t read_wait; /* queue read until command done */ 155 rwlock_t rq_list_lock; /* protect access to list in req_arr */ 156 int timeout; /* defaults to SG_DEFAULT_TIMEOUT */ 157 int timeout_user; /* defaults to SG_DEFAULT_TIMEOUT_USER */ 158 Sg_scatter_hold reserve; /* buffer held for this file descriptor */ 159 unsigned save_scat_len; /* original length of trunc. scat. element */ 160 Sg_request *headrp; /* head of request slist, NULL->empty */ 161 struct fasync_struct *async_qp; /* used by asynchronous notification */ 162 Sg_request req_arr[SG_MAX_QUEUE]; /* used as singly-linked list */ 163 char low_dma; /* as in parent but possibly overridden to 1 */ 164 char force_packid; /* 1 -> pack_id input to read(), 0 -> ignored */ 165 char cmd_q; /* 1 -> allow command queuing, 0 -> don't */ 166 unsigned char next_cmd_len; /* 0: automatic, >0: use on next write() */ 167 char keep_orphan; /* 0 -> drop orphan (def), 1 -> keep for read() */ 168 char mmap_called; /* 0 -> mmap() never called on this fd */ 169 struct kref f_ref; 170 struct execute_work ew; 171 } Sg_fd; 172 173 typedef struct sg_device { /* holds the state of each scsi generic device */ 174 struct scsi_device *device; 175 wait_queue_head_t open_wait; /* queue open() when O_EXCL present */ 176 struct mutex open_rel_lock; /* held when in open() or release() */ 177 int sg_tablesize; /* adapter's max scatter-gather table size */ 178 u32 index; /* device index number */ 179 struct list_head sfds; 180 rwlock_t sfd_lock; /* protect access to sfd list */ 181 atomic_t detaching; /* 0->device usable, 1->device detaching */ 182 bool exclude; /* 1->open(O_EXCL) succeeded and is active */ 183 int open_cnt; /* count of opens (perhaps < num(sfds) ) */ 184 char sgdebug; /* 0->off, 1->sense, 9->dump dev, 10-> all devs */ 185 struct gendisk *disk; 186 struct cdev * cdev; /* char_dev [sysfs: /sys/cdev/major/sg<n>] */ 187 struct kref d_ref; 188 } Sg_device; 189 190 /* tasklet or soft irq callback */ 191 static void sg_rq_end_io(struct request *rq, int uptodate); 192 static int sg_start_req(Sg_request *srp, unsigned char *cmd); 193 static int sg_finish_rem_req(Sg_request * srp); 194 static int sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size); 195 static ssize_t sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, 196 Sg_request * srp); 197 static ssize_t sg_new_write(Sg_fd *sfp, struct file *file, 198 const char __user *buf, size_t count, int blocking, 199 int read_only, int sg_io_owned, Sg_request **o_srp); 200 static int sg_common_write(Sg_fd * sfp, Sg_request * srp, 201 unsigned char *cmnd, int timeout, int blocking); 202 static int sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer); 203 static void sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp); 204 static void sg_build_reserve(Sg_fd * sfp, int req_size); 205 static void sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size); 206 static void sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp); 207 static Sg_fd *sg_add_sfp(Sg_device * sdp); 208 static void sg_remove_sfp(struct kref *); 209 static Sg_request *sg_get_rq_mark(Sg_fd * sfp, int pack_id); 210 static Sg_request *sg_add_request(Sg_fd * sfp); 211 static int sg_remove_request(Sg_fd * sfp, Sg_request * srp); 212 static int sg_res_in_use(Sg_fd * sfp); 213 static Sg_device *sg_get_dev(int dev); 214 static void sg_device_destroy(struct kref *kref); 215 216 #define SZ_SG_HEADER sizeof(struct sg_header) 217 #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t) 218 #define SZ_SG_IOVEC sizeof(sg_iovec_t) 219 #define SZ_SG_REQ_INFO sizeof(sg_req_info_t) 220 221 #define sg_printk(prefix, sdp, fmt, a...) \ 222 sdev_prefix_printk(prefix, (sdp)->device, \ 223 (sdp)->disk->disk_name, fmt, ##a) 224 225 static int sg_allow_access(struct file *filp, unsigned char *cmd) 226 { 227 struct sg_fd *sfp = filp->private_data; 228 229 if (sfp->parentdp->device->type == TYPE_SCANNER) 230 return 0; 231 232 return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); 233 } 234 235 static int 236 open_wait(Sg_device *sdp, int flags) 237 { 238 int retval = 0; 239 240 if (flags & O_EXCL) { 241 while (sdp->open_cnt > 0) { 242 mutex_unlock(&sdp->open_rel_lock); 243 retval = wait_event_interruptible(sdp->open_wait, 244 (atomic_read(&sdp->detaching) || 245 !sdp->open_cnt)); 246 mutex_lock(&sdp->open_rel_lock); 247 248 if (retval) /* -ERESTARTSYS */ 249 return retval; 250 if (atomic_read(&sdp->detaching)) 251 return -ENODEV; 252 } 253 } else { 254 while (sdp->exclude) { 255 mutex_unlock(&sdp->open_rel_lock); 256 retval = wait_event_interruptible(sdp->open_wait, 257 (atomic_read(&sdp->detaching) || 258 !sdp->exclude)); 259 mutex_lock(&sdp->open_rel_lock); 260 261 if (retval) /* -ERESTARTSYS */ 262 return retval; 263 if (atomic_read(&sdp->detaching)) 264 return -ENODEV; 265 } 266 } 267 268 return retval; 269 } 270 271 /* Returns 0 on success, else a negated errno value */ 272 static int 273 sg_open(struct inode *inode, struct file *filp) 274 { 275 int dev = iminor(inode); 276 int flags = filp->f_flags; 277 struct request_queue *q; 278 Sg_device *sdp; 279 Sg_fd *sfp; 280 int retval; 281 282 nonseekable_open(inode, filp); 283 if ((flags & O_EXCL) && (O_RDONLY == (flags & O_ACCMODE))) 284 return -EPERM; /* Can't lock it with read only access */ 285 sdp = sg_get_dev(dev); 286 if (IS_ERR(sdp)) 287 return PTR_ERR(sdp); 288 289 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 290 "sg_open: flags=0x%x\n", flags)); 291 292 /* This driver's module count bumped by fops_get in <linux/fs.h> */ 293 /* Prevent the device driver from vanishing while we sleep */ 294 retval = scsi_device_get(sdp->device); 295 if (retval) 296 goto sg_put; 297 298 retval = scsi_autopm_get_device(sdp->device); 299 if (retval) 300 goto sdp_put; 301 302 /* scsi_block_when_processing_errors() may block so bypass 303 * check if O_NONBLOCK. Permits SCSI commands to be issued 304 * during error recovery. Tread carefully. */ 305 if (!((flags & O_NONBLOCK) || 306 scsi_block_when_processing_errors(sdp->device))) { 307 retval = -ENXIO; 308 /* we are in error recovery for this device */ 309 goto error_out; 310 } 311 312 mutex_lock(&sdp->open_rel_lock); 313 if (flags & O_NONBLOCK) { 314 if (flags & O_EXCL) { 315 if (sdp->open_cnt > 0) { 316 retval = -EBUSY; 317 goto error_mutex_locked; 318 } 319 } else { 320 if (sdp->exclude) { 321 retval = -EBUSY; 322 goto error_mutex_locked; 323 } 324 } 325 } else { 326 retval = open_wait(sdp, flags); 327 if (retval) /* -ERESTARTSYS or -ENODEV */ 328 goto error_mutex_locked; 329 } 330 331 /* N.B. at this point we are holding the open_rel_lock */ 332 if (flags & O_EXCL) 333 sdp->exclude = true; 334 335 if (sdp->open_cnt < 1) { /* no existing opens */ 336 sdp->sgdebug = 0; 337 q = sdp->device->request_queue; 338 sdp->sg_tablesize = queue_max_segments(q); 339 } 340 sfp = sg_add_sfp(sdp); 341 if (IS_ERR(sfp)) { 342 retval = PTR_ERR(sfp); 343 goto out_undo; 344 } 345 346 filp->private_data = sfp; 347 sdp->open_cnt++; 348 mutex_unlock(&sdp->open_rel_lock); 349 350 retval = 0; 351 sg_put: 352 kref_put(&sdp->d_ref, sg_device_destroy); 353 return retval; 354 355 out_undo: 356 if (flags & O_EXCL) { 357 sdp->exclude = false; /* undo if error */ 358 wake_up_interruptible(&sdp->open_wait); 359 } 360 error_mutex_locked: 361 mutex_unlock(&sdp->open_rel_lock); 362 error_out: 363 scsi_autopm_put_device(sdp->device); 364 sdp_put: 365 scsi_device_put(sdp->device); 366 goto sg_put; 367 } 368 369 /* Release resources associated with a successful sg_open() 370 * Returns 0 on success, else a negated errno value */ 371 static int 372 sg_release(struct inode *inode, struct file *filp) 373 { 374 Sg_device *sdp; 375 Sg_fd *sfp; 376 377 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 378 return -ENXIO; 379 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_release\n")); 380 381 mutex_lock(&sdp->open_rel_lock); 382 scsi_autopm_put_device(sdp->device); 383 kref_put(&sfp->f_ref, sg_remove_sfp); 384 sdp->open_cnt--; 385 386 /* possibly many open()s waiting on exlude clearing, start many; 387 * only open(O_EXCL)s wait on 0==open_cnt so only start one */ 388 if (sdp->exclude) { 389 sdp->exclude = false; 390 wake_up_interruptible_all(&sdp->open_wait); 391 } else if (0 == sdp->open_cnt) { 392 wake_up_interruptible(&sdp->open_wait); 393 } 394 mutex_unlock(&sdp->open_rel_lock); 395 return 0; 396 } 397 398 static ssize_t 399 sg_read(struct file *filp, char __user *buf, size_t count, loff_t * ppos) 400 { 401 Sg_device *sdp; 402 Sg_fd *sfp; 403 Sg_request *srp; 404 int req_pack_id = -1; 405 sg_io_hdr_t *hp; 406 struct sg_header *old_hdr = NULL; 407 int retval = 0; 408 409 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 410 return -ENXIO; 411 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 412 "sg_read: count=%d\n", (int) count)); 413 414 if (!access_ok(VERIFY_WRITE, buf, count)) 415 return -EFAULT; 416 if (sfp->force_packid && (count >= SZ_SG_HEADER)) { 417 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 418 if (!old_hdr) 419 return -ENOMEM; 420 if (__copy_from_user(old_hdr, buf, SZ_SG_HEADER)) { 421 retval = -EFAULT; 422 goto free_old_hdr; 423 } 424 if (old_hdr->reply_len < 0) { 425 if (count >= SZ_SG_IO_HDR) { 426 sg_io_hdr_t *new_hdr; 427 new_hdr = kmalloc(SZ_SG_IO_HDR, GFP_KERNEL); 428 if (!new_hdr) { 429 retval = -ENOMEM; 430 goto free_old_hdr; 431 } 432 retval =__copy_from_user 433 (new_hdr, buf, SZ_SG_IO_HDR); 434 req_pack_id = new_hdr->pack_id; 435 kfree(new_hdr); 436 if (retval) { 437 retval = -EFAULT; 438 goto free_old_hdr; 439 } 440 } 441 } else 442 req_pack_id = old_hdr->pack_id; 443 } 444 srp = sg_get_rq_mark(sfp, req_pack_id); 445 if (!srp) { /* now wait on packet to arrive */ 446 if (atomic_read(&sdp->detaching)) { 447 retval = -ENODEV; 448 goto free_old_hdr; 449 } 450 if (filp->f_flags & O_NONBLOCK) { 451 retval = -EAGAIN; 452 goto free_old_hdr; 453 } 454 retval = wait_event_interruptible(sfp->read_wait, 455 (atomic_read(&sdp->detaching) || 456 (srp = sg_get_rq_mark(sfp, req_pack_id)))); 457 if (atomic_read(&sdp->detaching)) { 458 retval = -ENODEV; 459 goto free_old_hdr; 460 } 461 if (retval) { 462 /* -ERESTARTSYS as signal hit process */ 463 goto free_old_hdr; 464 } 465 } 466 if (srp->header.interface_id != '\0') { 467 retval = sg_new_read(sfp, buf, count, srp); 468 goto free_old_hdr; 469 } 470 471 hp = &srp->header; 472 if (old_hdr == NULL) { 473 old_hdr = kmalloc(SZ_SG_HEADER, GFP_KERNEL); 474 if (! old_hdr) { 475 retval = -ENOMEM; 476 goto free_old_hdr; 477 } 478 } 479 memset(old_hdr, 0, SZ_SG_HEADER); 480 old_hdr->reply_len = (int) hp->timeout; 481 old_hdr->pack_len = old_hdr->reply_len; /* old, strange behaviour */ 482 old_hdr->pack_id = hp->pack_id; 483 old_hdr->twelve_byte = 484 ((srp->data.cmd_opcode >= 0xc0) && (12 == hp->cmd_len)) ? 1 : 0; 485 old_hdr->target_status = hp->masked_status; 486 old_hdr->host_status = hp->host_status; 487 old_hdr->driver_status = hp->driver_status; 488 if ((CHECK_CONDITION & hp->masked_status) || 489 (DRIVER_SENSE & hp->driver_status)) 490 memcpy(old_hdr->sense_buffer, srp->sense_b, 491 sizeof (old_hdr->sense_buffer)); 492 switch (hp->host_status) { 493 /* This setup of 'result' is for backward compatibility and is best 494 ignored by the user who should use target, host + driver status */ 495 case DID_OK: 496 case DID_PASSTHROUGH: 497 case DID_SOFT_ERROR: 498 old_hdr->result = 0; 499 break; 500 case DID_NO_CONNECT: 501 case DID_BUS_BUSY: 502 case DID_TIME_OUT: 503 old_hdr->result = EBUSY; 504 break; 505 case DID_BAD_TARGET: 506 case DID_ABORT: 507 case DID_PARITY: 508 case DID_RESET: 509 case DID_BAD_INTR: 510 old_hdr->result = EIO; 511 break; 512 case DID_ERROR: 513 old_hdr->result = (srp->sense_b[0] == 0 && 514 hp->masked_status == GOOD) ? 0 : EIO; 515 break; 516 default: 517 old_hdr->result = EIO; 518 break; 519 } 520 521 /* Now copy the result back to the user buffer. */ 522 if (count >= SZ_SG_HEADER) { 523 if (__copy_to_user(buf, old_hdr, SZ_SG_HEADER)) { 524 retval = -EFAULT; 525 goto free_old_hdr; 526 } 527 buf += SZ_SG_HEADER; 528 if (count > old_hdr->reply_len) 529 count = old_hdr->reply_len; 530 if (count > SZ_SG_HEADER) { 531 if (sg_read_oxfer(srp, buf, count - SZ_SG_HEADER)) { 532 retval = -EFAULT; 533 goto free_old_hdr; 534 } 535 } 536 } else 537 count = (old_hdr->result == 0) ? 0 : -EIO; 538 sg_finish_rem_req(srp); 539 retval = count; 540 free_old_hdr: 541 kfree(old_hdr); 542 return retval; 543 } 544 545 static ssize_t 546 sg_new_read(Sg_fd * sfp, char __user *buf, size_t count, Sg_request * srp) 547 { 548 sg_io_hdr_t *hp = &srp->header; 549 int err = 0; 550 int len; 551 552 if (count < SZ_SG_IO_HDR) { 553 err = -EINVAL; 554 goto err_out; 555 } 556 hp->sb_len_wr = 0; 557 if ((hp->mx_sb_len > 0) && hp->sbp) { 558 if ((CHECK_CONDITION & hp->masked_status) || 559 (DRIVER_SENSE & hp->driver_status)) { 560 int sb_len = SCSI_SENSE_BUFFERSIZE; 561 sb_len = (hp->mx_sb_len > sb_len) ? sb_len : hp->mx_sb_len; 562 len = 8 + (int) srp->sense_b[7]; /* Additional sense length field */ 563 len = (len > sb_len) ? sb_len : len; 564 if (copy_to_user(hp->sbp, srp->sense_b, len)) { 565 err = -EFAULT; 566 goto err_out; 567 } 568 hp->sb_len_wr = len; 569 } 570 } 571 if (hp->masked_status || hp->host_status || hp->driver_status) 572 hp->info |= SG_INFO_CHECK; 573 if (copy_to_user(buf, hp, SZ_SG_IO_HDR)) { 574 err = -EFAULT; 575 goto err_out; 576 } 577 err_out: 578 err = sg_finish_rem_req(srp); 579 return (0 == err) ? count : err; 580 } 581 582 static ssize_t 583 sg_write(struct file *filp, const char __user *buf, size_t count, loff_t * ppos) 584 { 585 int mxsize, cmd_size, k; 586 int input_size, blocking; 587 unsigned char opcode; 588 Sg_device *sdp; 589 Sg_fd *sfp; 590 Sg_request *srp; 591 struct sg_header old_hdr; 592 sg_io_hdr_t *hp; 593 unsigned char cmnd[SG_MAX_CDB_SIZE]; 594 595 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 596 return -ENXIO; 597 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 598 "sg_write: count=%d\n", (int) count)); 599 if (atomic_read(&sdp->detaching)) 600 return -ENODEV; 601 if (!((filp->f_flags & O_NONBLOCK) || 602 scsi_block_when_processing_errors(sdp->device))) 603 return -ENXIO; 604 605 if (!access_ok(VERIFY_READ, buf, count)) 606 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 607 if (count < SZ_SG_HEADER) 608 return -EIO; 609 if (__copy_from_user(&old_hdr, buf, SZ_SG_HEADER)) 610 return -EFAULT; 611 blocking = !(filp->f_flags & O_NONBLOCK); 612 if (old_hdr.reply_len < 0) 613 return sg_new_write(sfp, filp, buf, count, 614 blocking, 0, 0, NULL); 615 if (count < (SZ_SG_HEADER + 6)) 616 return -EIO; /* The minimum scsi command length is 6 bytes. */ 617 618 if (!(srp = sg_add_request(sfp))) { 619 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sdp, 620 "sg_write: queue full\n")); 621 return -EDOM; 622 } 623 buf += SZ_SG_HEADER; 624 __get_user(opcode, buf); 625 if (sfp->next_cmd_len > 0) { 626 cmd_size = sfp->next_cmd_len; 627 sfp->next_cmd_len = 0; /* reset so only this write() effected */ 628 } else { 629 cmd_size = COMMAND_SIZE(opcode); /* based on SCSI command group */ 630 if ((opcode >= 0xc0) && old_hdr.twelve_byte) 631 cmd_size = 12; 632 } 633 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, 634 "sg_write: scsi opcode=0x%02x, cmd_size=%d\n", (int) opcode, cmd_size)); 635 /* Determine buffer size. */ 636 input_size = count - cmd_size; 637 mxsize = (input_size > old_hdr.reply_len) ? input_size : old_hdr.reply_len; 638 mxsize -= SZ_SG_HEADER; 639 input_size -= SZ_SG_HEADER; 640 if (input_size < 0) { 641 sg_remove_request(sfp, srp); 642 return -EIO; /* User did not pass enough bytes for this command. */ 643 } 644 hp = &srp->header; 645 hp->interface_id = '\0'; /* indicator of old interface tunnelled */ 646 hp->cmd_len = (unsigned char) cmd_size; 647 hp->iovec_count = 0; 648 hp->mx_sb_len = 0; 649 if (input_size > 0) 650 hp->dxfer_direction = (old_hdr.reply_len > SZ_SG_HEADER) ? 651 SG_DXFER_TO_FROM_DEV : SG_DXFER_TO_DEV; 652 else 653 hp->dxfer_direction = (mxsize > 0) ? SG_DXFER_FROM_DEV : SG_DXFER_NONE; 654 hp->dxfer_len = mxsize; 655 if (hp->dxfer_direction == SG_DXFER_TO_DEV) 656 hp->dxferp = (char __user *)buf + cmd_size; 657 else 658 hp->dxferp = NULL; 659 hp->sbp = NULL; 660 hp->timeout = old_hdr.reply_len; /* structure abuse ... */ 661 hp->flags = input_size; /* structure abuse ... */ 662 hp->pack_id = old_hdr.pack_id; 663 hp->usr_ptr = NULL; 664 if (__copy_from_user(cmnd, buf, cmd_size)) 665 return -EFAULT; 666 /* 667 * SG_DXFER_TO_FROM_DEV is functionally equivalent to SG_DXFER_FROM_DEV, 668 * but is is possible that the app intended SG_DXFER_TO_DEV, because there 669 * is a non-zero input_size, so emit a warning. 670 */ 671 if (hp->dxfer_direction == SG_DXFER_TO_FROM_DEV) { 672 static char cmd[TASK_COMM_LEN]; 673 if (strcmp(current->comm, cmd)) { 674 printk_ratelimited(KERN_WARNING 675 "sg_write: data in/out %d/%d bytes " 676 "for SCSI command 0x%x-- guessing " 677 "data in;\n program %s not setting " 678 "count and/or reply_len properly\n", 679 old_hdr.reply_len - (int)SZ_SG_HEADER, 680 input_size, (unsigned int) cmnd[0], 681 current->comm); 682 strcpy(cmd, current->comm); 683 } 684 } 685 k = sg_common_write(sfp, srp, cmnd, sfp->timeout, blocking); 686 return (k < 0) ? k : count; 687 } 688 689 static ssize_t 690 sg_new_write(Sg_fd *sfp, struct file *file, const char __user *buf, 691 size_t count, int blocking, int read_only, int sg_io_owned, 692 Sg_request **o_srp) 693 { 694 int k; 695 Sg_request *srp; 696 sg_io_hdr_t *hp; 697 unsigned char cmnd[SG_MAX_CDB_SIZE]; 698 int timeout; 699 unsigned long ul_timeout; 700 701 if (count < SZ_SG_IO_HDR) 702 return -EINVAL; 703 if (!access_ok(VERIFY_READ, buf, count)) 704 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 705 706 sfp->cmd_q = 1; /* when sg_io_hdr seen, set command queuing on */ 707 if (!(srp = sg_add_request(sfp))) { 708 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 709 "sg_new_write: queue full\n")); 710 return -EDOM; 711 } 712 srp->sg_io_owned = sg_io_owned; 713 hp = &srp->header; 714 if (__copy_from_user(hp, buf, SZ_SG_IO_HDR)) { 715 sg_remove_request(sfp, srp); 716 return -EFAULT; 717 } 718 if (hp->interface_id != 'S') { 719 sg_remove_request(sfp, srp); 720 return -ENOSYS; 721 } 722 if (hp->flags & SG_FLAG_MMAP_IO) { 723 if (hp->dxfer_len > sfp->reserve.bufflen) { 724 sg_remove_request(sfp, srp); 725 return -ENOMEM; /* MMAP_IO size must fit in reserve buffer */ 726 } 727 if (hp->flags & SG_FLAG_DIRECT_IO) { 728 sg_remove_request(sfp, srp); 729 return -EINVAL; /* either MMAP_IO or DIRECT_IO (not both) */ 730 } 731 if (sg_res_in_use(sfp)) { 732 sg_remove_request(sfp, srp); 733 return -EBUSY; /* reserve buffer already being used */ 734 } 735 } 736 ul_timeout = msecs_to_jiffies(srp->header.timeout); 737 timeout = (ul_timeout < INT_MAX) ? ul_timeout : INT_MAX; 738 if ((!hp->cmdp) || (hp->cmd_len < 6) || (hp->cmd_len > sizeof (cmnd))) { 739 sg_remove_request(sfp, srp); 740 return -EMSGSIZE; 741 } 742 if (!access_ok(VERIFY_READ, hp->cmdp, hp->cmd_len)) { 743 sg_remove_request(sfp, srp); 744 return -EFAULT; /* protects following copy_from_user()s + get_user()s */ 745 } 746 if (__copy_from_user(cmnd, hp->cmdp, hp->cmd_len)) { 747 sg_remove_request(sfp, srp); 748 return -EFAULT; 749 } 750 if (read_only && sg_allow_access(file, cmnd)) { 751 sg_remove_request(sfp, srp); 752 return -EPERM; 753 } 754 k = sg_common_write(sfp, srp, cmnd, timeout, blocking); 755 if (k < 0) 756 return k; 757 if (o_srp) 758 *o_srp = srp; 759 return count; 760 } 761 762 static int 763 sg_common_write(Sg_fd * sfp, Sg_request * srp, 764 unsigned char *cmnd, int timeout, int blocking) 765 { 766 int k, data_dir, at_head; 767 Sg_device *sdp = sfp->parentdp; 768 sg_io_hdr_t *hp = &srp->header; 769 770 srp->data.cmd_opcode = cmnd[0]; /* hold opcode of command */ 771 hp->status = 0; 772 hp->masked_status = 0; 773 hp->msg_status = 0; 774 hp->info = 0; 775 hp->host_status = 0; 776 hp->driver_status = 0; 777 hp->resid = 0; 778 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 779 "sg_common_write: scsi opcode=0x%02x, cmd_size=%d\n", 780 (int) cmnd[0], (int) hp->cmd_len)); 781 782 k = sg_start_req(srp, cmnd); 783 if (k) { 784 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 785 "sg_common_write: start_req err=%d\n", k)); 786 sg_finish_rem_req(srp); 787 return k; /* probably out of space --> ENOMEM */ 788 } 789 if (atomic_read(&sdp->detaching)) { 790 if (srp->bio) 791 blk_end_request_all(srp->rq, -EIO); 792 sg_finish_rem_req(srp); 793 return -ENODEV; 794 } 795 796 switch (hp->dxfer_direction) { 797 case SG_DXFER_TO_FROM_DEV: 798 case SG_DXFER_FROM_DEV: 799 data_dir = DMA_FROM_DEVICE; 800 break; 801 case SG_DXFER_TO_DEV: 802 data_dir = DMA_TO_DEVICE; 803 break; 804 case SG_DXFER_UNKNOWN: 805 data_dir = DMA_BIDIRECTIONAL; 806 break; 807 default: 808 data_dir = DMA_NONE; 809 break; 810 } 811 hp->duration = jiffies_to_msecs(jiffies); 812 if (hp->interface_id != '\0' && /* v3 (or later) interface */ 813 (SG_FLAG_Q_AT_TAIL & hp->flags)) 814 at_head = 0; 815 else 816 at_head = 1; 817 818 srp->rq->timeout = timeout; 819 kref_get(&sfp->f_ref); /* sg_rq_end_io() does kref_put(). */ 820 blk_execute_rq_nowait(sdp->device->request_queue, sdp->disk, 821 srp->rq, at_head, sg_rq_end_io); 822 return 0; 823 } 824 825 static int srp_done(Sg_fd *sfp, Sg_request *srp) 826 { 827 unsigned long flags; 828 int ret; 829 830 read_lock_irqsave(&sfp->rq_list_lock, flags); 831 ret = srp->done; 832 read_unlock_irqrestore(&sfp->rq_list_lock, flags); 833 return ret; 834 } 835 836 static int max_sectors_bytes(struct request_queue *q) 837 { 838 unsigned int max_sectors = queue_max_sectors(q); 839 840 max_sectors = min_t(unsigned int, max_sectors, INT_MAX >> 9); 841 842 return max_sectors << 9; 843 } 844 845 static long 846 sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 847 { 848 void __user *p = (void __user *)arg; 849 int __user *ip = p; 850 int result, val, read_only; 851 Sg_device *sdp; 852 Sg_fd *sfp; 853 Sg_request *srp; 854 unsigned long iflags; 855 856 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 857 return -ENXIO; 858 859 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 860 "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); 861 read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); 862 863 switch (cmd_in) { 864 case SG_IO: 865 if (atomic_read(&sdp->detaching)) 866 return -ENODEV; 867 if (!scsi_block_when_processing_errors(sdp->device)) 868 return -ENXIO; 869 if (!access_ok(VERIFY_WRITE, p, SZ_SG_IO_HDR)) 870 return -EFAULT; 871 result = sg_new_write(sfp, filp, p, SZ_SG_IO_HDR, 872 1, read_only, 1, &srp); 873 if (result < 0) 874 return result; 875 result = wait_event_interruptible(sfp->read_wait, 876 (srp_done(sfp, srp) || atomic_read(&sdp->detaching))); 877 if (atomic_read(&sdp->detaching)) 878 return -ENODEV; 879 write_lock_irq(&sfp->rq_list_lock); 880 if (srp->done) { 881 srp->done = 2; 882 write_unlock_irq(&sfp->rq_list_lock); 883 result = sg_new_read(sfp, p, SZ_SG_IO_HDR, srp); 884 return (result < 0) ? result : 0; 885 } 886 srp->orphan = 1; 887 write_unlock_irq(&sfp->rq_list_lock); 888 return result; /* -ERESTARTSYS because signal hit process */ 889 case SG_SET_TIMEOUT: 890 result = get_user(val, ip); 891 if (result) 892 return result; 893 if (val < 0) 894 return -EIO; 895 if (val >= MULDIV (INT_MAX, USER_HZ, HZ)) 896 val = MULDIV (INT_MAX, USER_HZ, HZ); 897 sfp->timeout_user = val; 898 sfp->timeout = MULDIV (val, HZ, USER_HZ); 899 900 return 0; 901 case SG_GET_TIMEOUT: /* N.B. User receives timeout as return value */ 902 /* strange ..., for backward compatibility */ 903 return sfp->timeout_user; 904 case SG_SET_FORCE_LOW_DMA: 905 result = get_user(val, ip); 906 if (result) 907 return result; 908 if (val) { 909 sfp->low_dma = 1; 910 if ((0 == sfp->low_dma) && (0 == sg_res_in_use(sfp))) { 911 val = (int) sfp->reserve.bufflen; 912 sg_remove_scat(sfp, &sfp->reserve); 913 sg_build_reserve(sfp, val); 914 } 915 } else { 916 if (atomic_read(&sdp->detaching)) 917 return -ENODEV; 918 sfp->low_dma = sdp->device->host->unchecked_isa_dma; 919 } 920 return 0; 921 case SG_GET_LOW_DMA: 922 return put_user((int) sfp->low_dma, ip); 923 case SG_GET_SCSI_ID: 924 if (!access_ok(VERIFY_WRITE, p, sizeof (sg_scsi_id_t))) 925 return -EFAULT; 926 else { 927 sg_scsi_id_t __user *sg_idp = p; 928 929 if (atomic_read(&sdp->detaching)) 930 return -ENODEV; 931 __put_user((int) sdp->device->host->host_no, 932 &sg_idp->host_no); 933 __put_user((int) sdp->device->channel, 934 &sg_idp->channel); 935 __put_user((int) sdp->device->id, &sg_idp->scsi_id); 936 __put_user((int) sdp->device->lun, &sg_idp->lun); 937 __put_user((int) sdp->device->type, &sg_idp->scsi_type); 938 __put_user((short) sdp->device->host->cmd_per_lun, 939 &sg_idp->h_cmd_per_lun); 940 __put_user((short) sdp->device->queue_depth, 941 &sg_idp->d_queue_depth); 942 __put_user(0, &sg_idp->unused[0]); 943 __put_user(0, &sg_idp->unused[1]); 944 return 0; 945 } 946 case SG_SET_FORCE_PACK_ID: 947 result = get_user(val, ip); 948 if (result) 949 return result; 950 sfp->force_packid = val ? 1 : 0; 951 return 0; 952 case SG_GET_PACK_ID: 953 if (!access_ok(VERIFY_WRITE, ip, sizeof (int))) 954 return -EFAULT; 955 read_lock_irqsave(&sfp->rq_list_lock, iflags); 956 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 957 if ((1 == srp->done) && (!srp->sg_io_owned)) { 958 read_unlock_irqrestore(&sfp->rq_list_lock, 959 iflags); 960 __put_user(srp->header.pack_id, ip); 961 return 0; 962 } 963 } 964 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 965 __put_user(-1, ip); 966 return 0; 967 case SG_GET_NUM_WAITING: 968 read_lock_irqsave(&sfp->rq_list_lock, iflags); 969 for (val = 0, srp = sfp->headrp; srp; srp = srp->nextrp) { 970 if ((1 == srp->done) && (!srp->sg_io_owned)) 971 ++val; 972 } 973 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 974 return put_user(val, ip); 975 case SG_GET_SG_TABLESIZE: 976 return put_user(sdp->sg_tablesize, ip); 977 case SG_SET_RESERVED_SIZE: 978 result = get_user(val, ip); 979 if (result) 980 return result; 981 if (val < 0) 982 return -EINVAL; 983 val = min_t(int, val, 984 max_sectors_bytes(sdp->device->request_queue)); 985 if (val != sfp->reserve.bufflen) { 986 if (sg_res_in_use(sfp) || sfp->mmap_called) 987 return -EBUSY; 988 sg_remove_scat(sfp, &sfp->reserve); 989 sg_build_reserve(sfp, val); 990 } 991 return 0; 992 case SG_GET_RESERVED_SIZE: 993 val = min_t(int, sfp->reserve.bufflen, 994 max_sectors_bytes(sdp->device->request_queue)); 995 return put_user(val, ip); 996 case SG_SET_COMMAND_Q: 997 result = get_user(val, ip); 998 if (result) 999 return result; 1000 sfp->cmd_q = val ? 1 : 0; 1001 return 0; 1002 case SG_GET_COMMAND_Q: 1003 return put_user((int) sfp->cmd_q, ip); 1004 case SG_SET_KEEP_ORPHAN: 1005 result = get_user(val, ip); 1006 if (result) 1007 return result; 1008 sfp->keep_orphan = val; 1009 return 0; 1010 case SG_GET_KEEP_ORPHAN: 1011 return put_user((int) sfp->keep_orphan, ip); 1012 case SG_NEXT_CMD_LEN: 1013 result = get_user(val, ip); 1014 if (result) 1015 return result; 1016 sfp->next_cmd_len = (val > 0) ? val : 0; 1017 return 0; 1018 case SG_GET_VERSION_NUM: 1019 return put_user(sg_version_num, ip); 1020 case SG_GET_ACCESS_COUNT: 1021 /* faked - we don't have a real access count anymore */ 1022 val = (sdp->device ? 1 : 0); 1023 return put_user(val, ip); 1024 case SG_GET_REQUEST_TABLE: 1025 if (!access_ok(VERIFY_WRITE, p, SZ_SG_REQ_INFO * SG_MAX_QUEUE)) 1026 return -EFAULT; 1027 else { 1028 sg_req_info_t *rinfo; 1029 unsigned int ms; 1030 1031 rinfo = kmalloc(SZ_SG_REQ_INFO * SG_MAX_QUEUE, 1032 GFP_KERNEL); 1033 if (!rinfo) 1034 return -ENOMEM; 1035 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1036 for (srp = sfp->headrp, val = 0; val < SG_MAX_QUEUE; 1037 ++val, srp = srp ? srp->nextrp : srp) { 1038 memset(&rinfo[val], 0, SZ_SG_REQ_INFO); 1039 if (srp) { 1040 rinfo[val].req_state = srp->done + 1; 1041 rinfo[val].problem = 1042 srp->header.masked_status & 1043 srp->header.host_status & 1044 srp->header.driver_status; 1045 if (srp->done) 1046 rinfo[val].duration = 1047 srp->header.duration; 1048 else { 1049 ms = jiffies_to_msecs(jiffies); 1050 rinfo[val].duration = 1051 (ms > srp->header.duration) ? 1052 (ms - srp->header.duration) : 0; 1053 } 1054 rinfo[val].orphan = srp->orphan; 1055 rinfo[val].sg_io_owned = 1056 srp->sg_io_owned; 1057 rinfo[val].pack_id = 1058 srp->header.pack_id; 1059 rinfo[val].usr_ptr = 1060 srp->header.usr_ptr; 1061 } 1062 } 1063 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1064 result = __copy_to_user(p, rinfo, 1065 SZ_SG_REQ_INFO * SG_MAX_QUEUE); 1066 result = result ? -EFAULT : 0; 1067 kfree(rinfo); 1068 return result; 1069 } 1070 case SG_EMULATED_HOST: 1071 if (atomic_read(&sdp->detaching)) 1072 return -ENODEV; 1073 return put_user(sdp->device->host->hostt->emulated, ip); 1074 case SCSI_IOCTL_SEND_COMMAND: 1075 if (atomic_read(&sdp->detaching)) 1076 return -ENODEV; 1077 if (read_only) { 1078 unsigned char opcode = WRITE_6; 1079 Scsi_Ioctl_Command __user *siocp = p; 1080 1081 if (copy_from_user(&opcode, siocp->data, 1)) 1082 return -EFAULT; 1083 if (sg_allow_access(filp, &opcode)) 1084 return -EPERM; 1085 } 1086 return sg_scsi_ioctl(sdp->device->request_queue, NULL, filp->f_mode, p); 1087 case SG_SET_DEBUG: 1088 result = get_user(val, ip); 1089 if (result) 1090 return result; 1091 sdp->sgdebug = (char) val; 1092 return 0; 1093 case BLKSECTGET: 1094 return put_user(max_sectors_bytes(sdp->device->request_queue), 1095 ip); 1096 case BLKTRACESETUP: 1097 return blk_trace_setup(sdp->device->request_queue, 1098 sdp->disk->disk_name, 1099 MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1100 NULL, 1101 (char *)arg); 1102 case BLKTRACESTART: 1103 return blk_trace_startstop(sdp->device->request_queue, 1); 1104 case BLKTRACESTOP: 1105 return blk_trace_startstop(sdp->device->request_queue, 0); 1106 case BLKTRACETEARDOWN: 1107 return blk_trace_remove(sdp->device->request_queue); 1108 case SCSI_IOCTL_GET_IDLUN: 1109 case SCSI_IOCTL_GET_BUS_NUMBER: 1110 case SCSI_IOCTL_PROBE_HOST: 1111 case SG_GET_TRANSFORM: 1112 case SG_SCSI_RESET: 1113 if (atomic_read(&sdp->detaching)) 1114 return -ENODEV; 1115 break; 1116 default: 1117 if (read_only) 1118 return -EPERM; /* don't know so take safe approach */ 1119 break; 1120 } 1121 1122 result = scsi_ioctl_block_when_processing_errors(sdp->device, 1123 cmd_in, filp->f_flags & O_NDELAY); 1124 if (result) 1125 return result; 1126 return scsi_ioctl(sdp->device, cmd_in, p); 1127 } 1128 1129 #ifdef CONFIG_COMPAT 1130 static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) 1131 { 1132 Sg_device *sdp; 1133 Sg_fd *sfp; 1134 struct scsi_device *sdev; 1135 1136 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1137 return -ENXIO; 1138 1139 sdev = sdp->device; 1140 if (sdev->host->hostt->compat_ioctl) { 1141 int ret; 1142 1143 ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); 1144 1145 return ret; 1146 } 1147 1148 return -ENOIOCTLCMD; 1149 } 1150 #endif 1151 1152 static unsigned int 1153 sg_poll(struct file *filp, poll_table * wait) 1154 { 1155 unsigned int res = 0; 1156 Sg_device *sdp; 1157 Sg_fd *sfp; 1158 Sg_request *srp; 1159 int count = 0; 1160 unsigned long iflags; 1161 1162 sfp = filp->private_data; 1163 if (!sfp) 1164 return POLLERR; 1165 sdp = sfp->parentdp; 1166 if (!sdp) 1167 return POLLERR; 1168 poll_wait(filp, &sfp->read_wait, wait); 1169 read_lock_irqsave(&sfp->rq_list_lock, iflags); 1170 for (srp = sfp->headrp; srp; srp = srp->nextrp) { 1171 /* if any read waiting, flag it */ 1172 if ((0 == res) && (1 == srp->done) && (!srp->sg_io_owned)) 1173 res = POLLIN | POLLRDNORM; 1174 ++count; 1175 } 1176 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1177 1178 if (atomic_read(&sdp->detaching)) 1179 res |= POLLHUP; 1180 else if (!sfp->cmd_q) { 1181 if (0 == count) 1182 res |= POLLOUT | POLLWRNORM; 1183 } else if (count < SG_MAX_QUEUE) 1184 res |= POLLOUT | POLLWRNORM; 1185 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1186 "sg_poll: res=0x%x\n", (int) res)); 1187 return res; 1188 } 1189 1190 static int 1191 sg_fasync(int fd, struct file *filp, int mode) 1192 { 1193 Sg_device *sdp; 1194 Sg_fd *sfp; 1195 1196 if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) 1197 return -ENXIO; 1198 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1199 "sg_fasync: mode=%d\n", mode)); 1200 1201 return fasync_helper(fd, filp, mode, &sfp->async_qp); 1202 } 1203 1204 static int 1205 sg_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 1206 { 1207 Sg_fd *sfp; 1208 unsigned long offset, len, sa; 1209 Sg_scatter_hold *rsv_schp; 1210 int k, length; 1211 1212 if ((NULL == vma) || (!(sfp = (Sg_fd *) vma->vm_private_data))) 1213 return VM_FAULT_SIGBUS; 1214 rsv_schp = &sfp->reserve; 1215 offset = vmf->pgoff << PAGE_SHIFT; 1216 if (offset >= rsv_schp->bufflen) 1217 return VM_FAULT_SIGBUS; 1218 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, 1219 "sg_vma_fault: offset=%lu, scatg=%d\n", 1220 offset, rsv_schp->k_use_sg)); 1221 sa = vma->vm_start; 1222 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1223 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1224 len = vma->vm_end - sa; 1225 len = (len < length) ? len : length; 1226 if (offset < len) { 1227 struct page *page = nth_page(rsv_schp->pages[k], 1228 offset >> PAGE_SHIFT); 1229 get_page(page); /* increment page count */ 1230 vmf->page = page; 1231 return 0; /* success */ 1232 } 1233 sa += len; 1234 offset -= len; 1235 } 1236 1237 return VM_FAULT_SIGBUS; 1238 } 1239 1240 static const struct vm_operations_struct sg_mmap_vm_ops = { 1241 .fault = sg_vma_fault, 1242 }; 1243 1244 static int 1245 sg_mmap(struct file *filp, struct vm_area_struct *vma) 1246 { 1247 Sg_fd *sfp; 1248 unsigned long req_sz, len, sa; 1249 Sg_scatter_hold *rsv_schp; 1250 int k, length; 1251 1252 if ((!filp) || (!vma) || (!(sfp = (Sg_fd *) filp->private_data))) 1253 return -ENXIO; 1254 req_sz = vma->vm_end - vma->vm_start; 1255 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sfp->parentdp, 1256 "sg_mmap starting, vm_start=%p, len=%d\n", 1257 (void *) vma->vm_start, (int) req_sz)); 1258 if (vma->vm_pgoff) 1259 return -EINVAL; /* want no offset */ 1260 rsv_schp = &sfp->reserve; 1261 if (req_sz > rsv_schp->bufflen) 1262 return -ENOMEM; /* cannot map more than reserved buffer */ 1263 1264 sa = vma->vm_start; 1265 length = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1266 for (k = 0; k < rsv_schp->k_use_sg && sa < vma->vm_end; k++) { 1267 len = vma->vm_end - sa; 1268 len = (len < length) ? len : length; 1269 sa += len; 1270 } 1271 1272 sfp->mmap_called = 1; 1273 vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 1274 vma->vm_private_data = sfp; 1275 vma->vm_ops = &sg_mmap_vm_ops; 1276 return 0; 1277 } 1278 1279 static void 1280 sg_rq_end_io_usercontext(struct work_struct *work) 1281 { 1282 struct sg_request *srp = container_of(work, struct sg_request, ew.work); 1283 struct sg_fd *sfp = srp->parentfp; 1284 1285 sg_finish_rem_req(srp); 1286 kref_put(&sfp->f_ref, sg_remove_sfp); 1287 } 1288 1289 /* 1290 * This function is a "bottom half" handler that is called by the mid 1291 * level when a command is completed (or has failed). 1292 */ 1293 static void 1294 sg_rq_end_io(struct request *rq, int uptodate) 1295 { 1296 struct sg_request *srp = rq->end_io_data; 1297 Sg_device *sdp; 1298 Sg_fd *sfp; 1299 unsigned long iflags; 1300 unsigned int ms; 1301 char *sense; 1302 int result, resid, done = 1; 1303 1304 if (WARN_ON(srp->done != 0)) 1305 return; 1306 1307 sfp = srp->parentfp; 1308 if (WARN_ON(sfp == NULL)) 1309 return; 1310 1311 sdp = sfp->parentdp; 1312 if (unlikely(atomic_read(&sdp->detaching))) 1313 pr_info("%s: device detaching\n", __func__); 1314 1315 sense = rq->sense; 1316 result = rq->errors; 1317 resid = rq->resid_len; 1318 1319 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sdp, 1320 "sg_cmd_done: pack_id=%d, res=0x%x\n", 1321 srp->header.pack_id, result)); 1322 srp->header.resid = resid; 1323 ms = jiffies_to_msecs(jiffies); 1324 srp->header.duration = (ms > srp->header.duration) ? 1325 (ms - srp->header.duration) : 0; 1326 if (0 != result) { 1327 struct scsi_sense_hdr sshdr; 1328 1329 srp->header.status = 0xff & result; 1330 srp->header.masked_status = status_byte(result); 1331 srp->header.msg_status = msg_byte(result); 1332 srp->header.host_status = host_byte(result); 1333 srp->header.driver_status = driver_byte(result); 1334 if ((sdp->sgdebug > 0) && 1335 ((CHECK_CONDITION == srp->header.masked_status) || 1336 (COMMAND_TERMINATED == srp->header.masked_status))) 1337 __scsi_print_sense(sdp->device, __func__, sense, 1338 SCSI_SENSE_BUFFERSIZE); 1339 1340 /* Following if statement is a patch supplied by Eric Youngdale */ 1341 if (driver_byte(result) != 0 1342 && scsi_normalize_sense(sense, SCSI_SENSE_BUFFERSIZE, &sshdr) 1343 && !scsi_sense_is_deferred(&sshdr) 1344 && sshdr.sense_key == UNIT_ATTENTION 1345 && sdp->device->removable) { 1346 /* Detected possible disc change. Set the bit - this */ 1347 /* may be used if there are filesystems using this device */ 1348 sdp->device->changed = 1; 1349 } 1350 } 1351 /* Rely on write phase to clean out srp status values, so no "else" */ 1352 1353 write_lock_irqsave(&sfp->rq_list_lock, iflags); 1354 if (unlikely(srp->orphan)) { 1355 if (sfp->keep_orphan) 1356 srp->sg_io_owned = 0; 1357 else 1358 done = 0; 1359 } 1360 srp->done = done; 1361 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 1362 1363 if (likely(done)) { 1364 /* Now wake up any sg_read() that is waiting for this 1365 * packet. 1366 */ 1367 wake_up_interruptible(&sfp->read_wait); 1368 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_IN); 1369 kref_put(&sfp->f_ref, sg_remove_sfp); 1370 } else { 1371 INIT_WORK(&srp->ew.work, sg_rq_end_io_usercontext); 1372 schedule_work(&srp->ew.work); 1373 } 1374 } 1375 1376 static const struct file_operations sg_fops = { 1377 .owner = THIS_MODULE, 1378 .read = sg_read, 1379 .write = sg_write, 1380 .poll = sg_poll, 1381 .unlocked_ioctl = sg_ioctl, 1382 #ifdef CONFIG_COMPAT 1383 .compat_ioctl = sg_compat_ioctl, 1384 #endif 1385 .open = sg_open, 1386 .mmap = sg_mmap, 1387 .release = sg_release, 1388 .fasync = sg_fasync, 1389 .llseek = no_llseek, 1390 }; 1391 1392 static struct class *sg_sysfs_class; 1393 1394 static int sg_sysfs_valid = 0; 1395 1396 static Sg_device * 1397 sg_alloc(struct gendisk *disk, struct scsi_device *scsidp) 1398 { 1399 struct request_queue *q = scsidp->request_queue; 1400 Sg_device *sdp; 1401 unsigned long iflags; 1402 int error; 1403 u32 k; 1404 1405 sdp = kzalloc(sizeof(Sg_device), GFP_KERNEL); 1406 if (!sdp) { 1407 sdev_printk(KERN_WARNING, scsidp, "%s: kmalloc Sg_device " 1408 "failure\n", __func__); 1409 return ERR_PTR(-ENOMEM); 1410 } 1411 1412 idr_preload(GFP_KERNEL); 1413 write_lock_irqsave(&sg_index_lock, iflags); 1414 1415 error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT); 1416 if (error < 0) { 1417 if (error == -ENOSPC) { 1418 sdev_printk(KERN_WARNING, scsidp, 1419 "Unable to attach sg device type=%d, minor number exceeds %d\n", 1420 scsidp->type, SG_MAX_DEVS - 1); 1421 error = -ENODEV; 1422 } else { 1423 sdev_printk(KERN_WARNING, scsidp, "%s: idr " 1424 "allocation Sg_device failure: %d\n", 1425 __func__, error); 1426 } 1427 goto out_unlock; 1428 } 1429 k = error; 1430 1431 SCSI_LOG_TIMEOUT(3, sdev_printk(KERN_INFO, scsidp, 1432 "sg_alloc: dev=%d \n", k)); 1433 sprintf(disk->disk_name, "sg%d", k); 1434 disk->first_minor = k; 1435 sdp->disk = disk; 1436 sdp->device = scsidp; 1437 mutex_init(&sdp->open_rel_lock); 1438 INIT_LIST_HEAD(&sdp->sfds); 1439 init_waitqueue_head(&sdp->open_wait); 1440 atomic_set(&sdp->detaching, 0); 1441 rwlock_init(&sdp->sfd_lock); 1442 sdp->sg_tablesize = queue_max_segments(q); 1443 sdp->index = k; 1444 kref_init(&sdp->d_ref); 1445 error = 0; 1446 1447 out_unlock: 1448 write_unlock_irqrestore(&sg_index_lock, iflags); 1449 idr_preload_end(); 1450 1451 if (error) { 1452 kfree(sdp); 1453 return ERR_PTR(error); 1454 } 1455 return sdp; 1456 } 1457 1458 static int 1459 sg_add_device(struct device *cl_dev, struct class_interface *cl_intf) 1460 { 1461 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1462 struct gendisk *disk; 1463 Sg_device *sdp = NULL; 1464 struct cdev * cdev = NULL; 1465 int error; 1466 unsigned long iflags; 1467 1468 disk = alloc_disk(1); 1469 if (!disk) { 1470 pr_warn("%s: alloc_disk failed\n", __func__); 1471 return -ENOMEM; 1472 } 1473 disk->major = SCSI_GENERIC_MAJOR; 1474 1475 error = -ENOMEM; 1476 cdev = cdev_alloc(); 1477 if (!cdev) { 1478 pr_warn("%s: cdev_alloc failed\n", __func__); 1479 goto out; 1480 } 1481 cdev->owner = THIS_MODULE; 1482 cdev->ops = &sg_fops; 1483 1484 sdp = sg_alloc(disk, scsidp); 1485 if (IS_ERR(sdp)) { 1486 pr_warn("%s: sg_alloc failed\n", __func__); 1487 error = PTR_ERR(sdp); 1488 goto out; 1489 } 1490 1491 error = cdev_add(cdev, MKDEV(SCSI_GENERIC_MAJOR, sdp->index), 1); 1492 if (error) 1493 goto cdev_add_err; 1494 1495 sdp->cdev = cdev; 1496 if (sg_sysfs_valid) { 1497 struct device *sg_class_member; 1498 1499 sg_class_member = device_create(sg_sysfs_class, cl_dev->parent, 1500 MKDEV(SCSI_GENERIC_MAJOR, 1501 sdp->index), 1502 sdp, "%s", disk->disk_name); 1503 if (IS_ERR(sg_class_member)) { 1504 pr_err("%s: device_create failed\n", __func__); 1505 error = PTR_ERR(sg_class_member); 1506 goto cdev_add_err; 1507 } 1508 error = sysfs_create_link(&scsidp->sdev_gendev.kobj, 1509 &sg_class_member->kobj, "generic"); 1510 if (error) 1511 pr_err("%s: unable to make symlink 'generic' back " 1512 "to sg%d\n", __func__, sdp->index); 1513 } else 1514 pr_warn("%s: sg_sys Invalid\n", __func__); 1515 1516 sdev_printk(KERN_NOTICE, scsidp, "Attached scsi generic sg%d " 1517 "type %d\n", sdp->index, scsidp->type); 1518 1519 dev_set_drvdata(cl_dev, sdp); 1520 1521 return 0; 1522 1523 cdev_add_err: 1524 write_lock_irqsave(&sg_index_lock, iflags); 1525 idr_remove(&sg_index_idr, sdp->index); 1526 write_unlock_irqrestore(&sg_index_lock, iflags); 1527 kfree(sdp); 1528 1529 out: 1530 put_disk(disk); 1531 if (cdev) 1532 cdev_del(cdev); 1533 return error; 1534 } 1535 1536 static void 1537 sg_device_destroy(struct kref *kref) 1538 { 1539 struct sg_device *sdp = container_of(kref, struct sg_device, d_ref); 1540 unsigned long flags; 1541 1542 /* CAUTION! Note that the device can still be found via idr_find() 1543 * even though the refcount is 0. Therefore, do idr_remove() BEFORE 1544 * any other cleanup. 1545 */ 1546 1547 write_lock_irqsave(&sg_index_lock, flags); 1548 idr_remove(&sg_index_idr, sdp->index); 1549 write_unlock_irqrestore(&sg_index_lock, flags); 1550 1551 SCSI_LOG_TIMEOUT(3, 1552 sg_printk(KERN_INFO, sdp, "sg_device_destroy\n")); 1553 1554 put_disk(sdp->disk); 1555 kfree(sdp); 1556 } 1557 1558 static void 1559 sg_remove_device(struct device *cl_dev, struct class_interface *cl_intf) 1560 { 1561 struct scsi_device *scsidp = to_scsi_device(cl_dev->parent); 1562 Sg_device *sdp = dev_get_drvdata(cl_dev); 1563 unsigned long iflags; 1564 Sg_fd *sfp; 1565 int val; 1566 1567 if (!sdp) 1568 return; 1569 /* want sdp->detaching non-zero as soon as possible */ 1570 val = atomic_inc_return(&sdp->detaching); 1571 if (val > 1) 1572 return; /* only want to do following once per device */ 1573 1574 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 1575 "%s\n", __func__)); 1576 1577 read_lock_irqsave(&sdp->sfd_lock, iflags); 1578 list_for_each_entry(sfp, &sdp->sfds, sfd_siblings) { 1579 wake_up_interruptible_all(&sfp->read_wait); 1580 kill_fasync(&sfp->async_qp, SIGPOLL, POLL_HUP); 1581 } 1582 wake_up_interruptible_all(&sdp->open_wait); 1583 read_unlock_irqrestore(&sdp->sfd_lock, iflags); 1584 1585 sysfs_remove_link(&scsidp->sdev_gendev.kobj, "generic"); 1586 device_destroy(sg_sysfs_class, MKDEV(SCSI_GENERIC_MAJOR, sdp->index)); 1587 cdev_del(sdp->cdev); 1588 sdp->cdev = NULL; 1589 1590 kref_put(&sdp->d_ref, sg_device_destroy); 1591 } 1592 1593 module_param_named(scatter_elem_sz, scatter_elem_sz, int, S_IRUGO | S_IWUSR); 1594 module_param_named(def_reserved_size, def_reserved_size, int, 1595 S_IRUGO | S_IWUSR); 1596 module_param_named(allow_dio, sg_allow_dio, int, S_IRUGO | S_IWUSR); 1597 1598 MODULE_AUTHOR("Douglas Gilbert"); 1599 MODULE_DESCRIPTION("SCSI generic (sg) driver"); 1600 MODULE_LICENSE("GPL"); 1601 MODULE_VERSION(SG_VERSION_STR); 1602 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_GENERIC_MAJOR); 1603 1604 MODULE_PARM_DESC(scatter_elem_sz, "scatter gather element " 1605 "size (default: max(SG_SCATTER_SZ, PAGE_SIZE))"); 1606 MODULE_PARM_DESC(def_reserved_size, "size of buffer reserved for each fd"); 1607 MODULE_PARM_DESC(allow_dio, "allow direct I/O (default: 0 (disallow))"); 1608 1609 static int __init 1610 init_sg(void) 1611 { 1612 int rc; 1613 1614 if (scatter_elem_sz < PAGE_SIZE) { 1615 scatter_elem_sz = PAGE_SIZE; 1616 scatter_elem_sz_prev = scatter_elem_sz; 1617 } 1618 if (def_reserved_size >= 0) 1619 sg_big_buff = def_reserved_size; 1620 else 1621 def_reserved_size = sg_big_buff; 1622 1623 rc = register_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1624 SG_MAX_DEVS, "sg"); 1625 if (rc) 1626 return rc; 1627 sg_sysfs_class = class_create(THIS_MODULE, "scsi_generic"); 1628 if ( IS_ERR(sg_sysfs_class) ) { 1629 rc = PTR_ERR(sg_sysfs_class); 1630 goto err_out; 1631 } 1632 sg_sysfs_valid = 1; 1633 rc = scsi_register_interface(&sg_interface); 1634 if (0 == rc) { 1635 #ifdef CONFIG_SCSI_PROC_FS 1636 sg_proc_init(); 1637 #endif /* CONFIG_SCSI_PROC_FS */ 1638 return 0; 1639 } 1640 class_destroy(sg_sysfs_class); 1641 err_out: 1642 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), SG_MAX_DEVS); 1643 return rc; 1644 } 1645 1646 static void __exit 1647 exit_sg(void) 1648 { 1649 #ifdef CONFIG_SCSI_PROC_FS 1650 sg_proc_cleanup(); 1651 #endif /* CONFIG_SCSI_PROC_FS */ 1652 scsi_unregister_interface(&sg_interface); 1653 class_destroy(sg_sysfs_class); 1654 sg_sysfs_valid = 0; 1655 unregister_chrdev_region(MKDEV(SCSI_GENERIC_MAJOR, 0), 1656 SG_MAX_DEVS); 1657 idr_destroy(&sg_index_idr); 1658 } 1659 1660 static int 1661 sg_start_req(Sg_request *srp, unsigned char *cmd) 1662 { 1663 int res; 1664 struct request *rq; 1665 Sg_fd *sfp = srp->parentfp; 1666 sg_io_hdr_t *hp = &srp->header; 1667 int dxfer_len = (int) hp->dxfer_len; 1668 int dxfer_dir = hp->dxfer_direction; 1669 unsigned int iov_count = hp->iovec_count; 1670 Sg_scatter_hold *req_schp = &srp->data; 1671 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1672 struct request_queue *q = sfp->parentdp->device->request_queue; 1673 struct rq_map_data *md, map_data; 1674 int rw = hp->dxfer_direction == SG_DXFER_TO_DEV ? WRITE : READ; 1675 unsigned char *long_cmdp = NULL; 1676 1677 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1678 "sg_start_req: dxfer_len=%d\n", 1679 dxfer_len)); 1680 1681 if (hp->cmd_len > BLK_MAX_CDB) { 1682 long_cmdp = kzalloc(hp->cmd_len, GFP_KERNEL); 1683 if (!long_cmdp) 1684 return -ENOMEM; 1685 } 1686 1687 rq = blk_get_request(q, rw, GFP_ATOMIC); 1688 if (IS_ERR(rq)) { 1689 kfree(long_cmdp); 1690 return PTR_ERR(rq); 1691 } 1692 1693 blk_rq_set_block_pc(rq); 1694 1695 if (hp->cmd_len > BLK_MAX_CDB) 1696 rq->cmd = long_cmdp; 1697 memcpy(rq->cmd, cmd, hp->cmd_len); 1698 rq->cmd_len = hp->cmd_len; 1699 1700 srp->rq = rq; 1701 rq->end_io_data = srp; 1702 rq->sense = srp->sense_b; 1703 rq->retries = SG_DEFAULT_RETRIES; 1704 1705 if ((dxfer_len <= 0) || (dxfer_dir == SG_DXFER_NONE)) 1706 return 0; 1707 1708 if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO && 1709 dxfer_dir != SG_DXFER_UNKNOWN && !iov_count && 1710 !sfp->parentdp->device->host->unchecked_isa_dma && 1711 blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len)) 1712 md = NULL; 1713 else 1714 md = &map_data; 1715 1716 if (md) { 1717 if (!sg_res_in_use(sfp) && dxfer_len <= rsv_schp->bufflen) 1718 sg_link_reserve(sfp, srp, dxfer_len); 1719 else { 1720 res = sg_build_indirect(req_schp, sfp, dxfer_len); 1721 if (res) 1722 return res; 1723 } 1724 1725 md->pages = req_schp->pages; 1726 md->page_order = req_schp->page_order; 1727 md->nr_entries = req_schp->k_use_sg; 1728 md->offset = 0; 1729 md->null_mapped = hp->dxferp ? 0 : 1; 1730 if (dxfer_dir == SG_DXFER_TO_FROM_DEV) 1731 md->from_user = 1; 1732 else 1733 md->from_user = 0; 1734 } 1735 1736 if (iov_count) { 1737 int len, size = sizeof(struct sg_iovec) * iov_count; 1738 struct iovec *iov; 1739 1740 iov = memdup_user(hp->dxferp, size); 1741 if (IS_ERR(iov)) 1742 return PTR_ERR(iov); 1743 1744 len = iov_length(iov, iov_count); 1745 if (hp->dxfer_len < len) { 1746 iov_count = iov_shorten(iov, iov_count, hp->dxfer_len); 1747 len = hp->dxfer_len; 1748 } 1749 1750 res = blk_rq_map_user_iov(q, rq, md, (struct sg_iovec *)iov, 1751 iov_count, 1752 len, GFP_ATOMIC); 1753 kfree(iov); 1754 } else 1755 res = blk_rq_map_user(q, rq, md, hp->dxferp, 1756 hp->dxfer_len, GFP_ATOMIC); 1757 1758 if (!res) { 1759 srp->bio = rq->bio; 1760 1761 if (!md) { 1762 req_schp->dio_in_use = 1; 1763 hp->info |= SG_INFO_DIRECT_IO; 1764 } 1765 } 1766 return res; 1767 } 1768 1769 static int 1770 sg_finish_rem_req(Sg_request *srp) 1771 { 1772 int ret = 0; 1773 1774 Sg_fd *sfp = srp->parentfp; 1775 Sg_scatter_hold *req_schp = &srp->data; 1776 1777 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1778 "sg_finish_rem_req: res_used=%d\n", 1779 (int) srp->res_used)); 1780 if (srp->rq) { 1781 if (srp->bio) 1782 ret = blk_rq_unmap_user(srp->bio); 1783 1784 if (srp->rq->cmd != srp->rq->__cmd) 1785 kfree(srp->rq->cmd); 1786 blk_put_request(srp->rq); 1787 } 1788 1789 if (srp->res_used) 1790 sg_unlink_reserve(sfp, srp); 1791 else 1792 sg_remove_scat(sfp, req_schp); 1793 1794 sg_remove_request(sfp, srp); 1795 1796 return ret; 1797 } 1798 1799 static int 1800 sg_build_sgat(Sg_scatter_hold * schp, const Sg_fd * sfp, int tablesize) 1801 { 1802 int sg_bufflen = tablesize * sizeof(struct page *); 1803 gfp_t gfp_flags = GFP_ATOMIC | __GFP_NOWARN; 1804 1805 schp->pages = kzalloc(sg_bufflen, gfp_flags); 1806 if (!schp->pages) 1807 return -ENOMEM; 1808 schp->sglist_len = sg_bufflen; 1809 return tablesize; /* number of scat_gath elements allocated */ 1810 } 1811 1812 static int 1813 sg_build_indirect(Sg_scatter_hold * schp, Sg_fd * sfp, int buff_size) 1814 { 1815 int ret_sz = 0, i, k, rem_sz, num, mx_sc_elems; 1816 int sg_tablesize = sfp->parentdp->sg_tablesize; 1817 int blk_size = buff_size, order; 1818 gfp_t gfp_mask = GFP_ATOMIC | __GFP_COMP | __GFP_NOWARN; 1819 1820 if (blk_size < 0) 1821 return -EFAULT; 1822 if (0 == blk_size) 1823 ++blk_size; /* don't know why */ 1824 /* round request up to next highest SG_SECTOR_SZ byte boundary */ 1825 blk_size = ALIGN(blk_size, SG_SECTOR_SZ); 1826 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1827 "sg_build_indirect: buff_size=%d, blk_size=%d\n", 1828 buff_size, blk_size)); 1829 1830 /* N.B. ret_sz carried into this block ... */ 1831 mx_sc_elems = sg_build_sgat(schp, sfp, sg_tablesize); 1832 if (mx_sc_elems < 0) 1833 return mx_sc_elems; /* most likely -ENOMEM */ 1834 1835 num = scatter_elem_sz; 1836 if (unlikely(num != scatter_elem_sz_prev)) { 1837 if (num < PAGE_SIZE) { 1838 scatter_elem_sz = PAGE_SIZE; 1839 scatter_elem_sz_prev = PAGE_SIZE; 1840 } else 1841 scatter_elem_sz_prev = num; 1842 } 1843 1844 if (sfp->low_dma) 1845 gfp_mask |= GFP_DMA; 1846 1847 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 1848 gfp_mask |= __GFP_ZERO; 1849 1850 order = get_order(num); 1851 retry: 1852 ret_sz = 1 << (PAGE_SHIFT + order); 1853 1854 for (k = 0, rem_sz = blk_size; rem_sz > 0 && k < mx_sc_elems; 1855 k++, rem_sz -= ret_sz) { 1856 1857 num = (rem_sz > scatter_elem_sz_prev) ? 1858 scatter_elem_sz_prev : rem_sz; 1859 1860 schp->pages[k] = alloc_pages(gfp_mask, order); 1861 if (!schp->pages[k]) 1862 goto out; 1863 1864 if (num == scatter_elem_sz_prev) { 1865 if (unlikely(ret_sz > scatter_elem_sz_prev)) { 1866 scatter_elem_sz = ret_sz; 1867 scatter_elem_sz_prev = ret_sz; 1868 } 1869 } 1870 1871 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, 1872 "sg_build_indirect: k=%d, num=%d, ret_sz=%d\n", 1873 k, num, ret_sz)); 1874 } /* end of for loop */ 1875 1876 schp->page_order = order; 1877 schp->k_use_sg = k; 1878 SCSI_LOG_TIMEOUT(5, sg_printk(KERN_INFO, sfp->parentdp, 1879 "sg_build_indirect: k_use_sg=%d, rem_sz=%d\n", 1880 k, rem_sz)); 1881 1882 schp->bufflen = blk_size; 1883 if (rem_sz > 0) /* must have failed */ 1884 return -ENOMEM; 1885 return 0; 1886 out: 1887 for (i = 0; i < k; i++) 1888 __free_pages(schp->pages[i], order); 1889 1890 if (--order >= 0) 1891 goto retry; 1892 1893 return -ENOMEM; 1894 } 1895 1896 static void 1897 sg_remove_scat(Sg_fd * sfp, Sg_scatter_hold * schp) 1898 { 1899 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1900 "sg_remove_scat: k_use_sg=%d\n", schp->k_use_sg)); 1901 if (schp->pages && schp->sglist_len > 0) { 1902 if (!schp->dio_in_use) { 1903 int k; 1904 1905 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1906 SCSI_LOG_TIMEOUT(5, 1907 sg_printk(KERN_INFO, sfp->parentdp, 1908 "sg_remove_scat: k=%d, pg=0x%p\n", 1909 k, schp->pages[k])); 1910 __free_pages(schp->pages[k], schp->page_order); 1911 } 1912 1913 kfree(schp->pages); 1914 } 1915 } 1916 memset(schp, 0, sizeof (*schp)); 1917 } 1918 1919 static int 1920 sg_read_oxfer(Sg_request * srp, char __user *outp, int num_read_xfer) 1921 { 1922 Sg_scatter_hold *schp = &srp->data; 1923 int k, num; 1924 1925 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, 1926 "sg_read_oxfer: num_read_xfer=%d\n", 1927 num_read_xfer)); 1928 if ((!outp) || (num_read_xfer <= 0)) 1929 return 0; 1930 1931 num = 1 << (PAGE_SHIFT + schp->page_order); 1932 for (k = 0; k < schp->k_use_sg && schp->pages[k]; k++) { 1933 if (num > num_read_xfer) { 1934 if (__copy_to_user(outp, page_address(schp->pages[k]), 1935 num_read_xfer)) 1936 return -EFAULT; 1937 break; 1938 } else { 1939 if (__copy_to_user(outp, page_address(schp->pages[k]), 1940 num)) 1941 return -EFAULT; 1942 num_read_xfer -= num; 1943 if (num_read_xfer <= 0) 1944 break; 1945 outp += num; 1946 } 1947 } 1948 1949 return 0; 1950 } 1951 1952 static void 1953 sg_build_reserve(Sg_fd * sfp, int req_size) 1954 { 1955 Sg_scatter_hold *schp = &sfp->reserve; 1956 1957 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1958 "sg_build_reserve: req_size=%d\n", req_size)); 1959 do { 1960 if (req_size < PAGE_SIZE) 1961 req_size = PAGE_SIZE; 1962 if (0 == sg_build_indirect(schp, sfp, req_size)) 1963 return; 1964 else 1965 sg_remove_scat(sfp, schp); 1966 req_size >>= 1; /* divide by 2 */ 1967 } while (req_size > (PAGE_SIZE / 2)); 1968 } 1969 1970 static void 1971 sg_link_reserve(Sg_fd * sfp, Sg_request * srp, int size) 1972 { 1973 Sg_scatter_hold *req_schp = &srp->data; 1974 Sg_scatter_hold *rsv_schp = &sfp->reserve; 1975 int k, num, rem; 1976 1977 srp->res_used = 1; 1978 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, sfp->parentdp, 1979 "sg_link_reserve: size=%d\n", size)); 1980 rem = size; 1981 1982 num = 1 << (PAGE_SHIFT + rsv_schp->page_order); 1983 for (k = 0; k < rsv_schp->k_use_sg; k++) { 1984 if (rem <= num) { 1985 req_schp->k_use_sg = k + 1; 1986 req_schp->sglist_len = rsv_schp->sglist_len; 1987 req_schp->pages = rsv_schp->pages; 1988 1989 req_schp->bufflen = size; 1990 req_schp->page_order = rsv_schp->page_order; 1991 break; 1992 } else 1993 rem -= num; 1994 } 1995 1996 if (k >= rsv_schp->k_use_sg) 1997 SCSI_LOG_TIMEOUT(1, sg_printk(KERN_INFO, sfp->parentdp, 1998 "sg_link_reserve: BAD size\n")); 1999 } 2000 2001 static void 2002 sg_unlink_reserve(Sg_fd * sfp, Sg_request * srp) 2003 { 2004 Sg_scatter_hold *req_schp = &srp->data; 2005 2006 SCSI_LOG_TIMEOUT(4, sg_printk(KERN_INFO, srp->parentfp->parentdp, 2007 "sg_unlink_reserve: req->k_use_sg=%d\n", 2008 (int) req_schp->k_use_sg)); 2009 req_schp->k_use_sg = 0; 2010 req_schp->bufflen = 0; 2011 req_schp->pages = NULL; 2012 req_schp->page_order = 0; 2013 req_schp->sglist_len = 0; 2014 sfp->save_scat_len = 0; 2015 srp->res_used = 0; 2016 } 2017 2018 static Sg_request * 2019 sg_get_rq_mark(Sg_fd * sfp, int pack_id) 2020 { 2021 Sg_request *resp; 2022 unsigned long iflags; 2023 2024 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2025 for (resp = sfp->headrp; resp; resp = resp->nextrp) { 2026 /* look for requests that are ready + not SG_IO owned */ 2027 if ((1 == resp->done) && (!resp->sg_io_owned) && 2028 ((-1 == pack_id) || (resp->header.pack_id == pack_id))) { 2029 resp->done = 2; /* guard against other readers */ 2030 break; 2031 } 2032 } 2033 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2034 return resp; 2035 } 2036 2037 /* always adds to end of list */ 2038 static Sg_request * 2039 sg_add_request(Sg_fd * sfp) 2040 { 2041 int k; 2042 unsigned long iflags; 2043 Sg_request *resp; 2044 Sg_request *rp = sfp->req_arr; 2045 2046 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2047 resp = sfp->headrp; 2048 if (!resp) { 2049 memset(rp, 0, sizeof (Sg_request)); 2050 rp->parentfp = sfp; 2051 resp = rp; 2052 sfp->headrp = resp; 2053 } else { 2054 if (0 == sfp->cmd_q) 2055 resp = NULL; /* command queuing disallowed */ 2056 else { 2057 for (k = 0; k < SG_MAX_QUEUE; ++k, ++rp) { 2058 if (!rp->parentfp) 2059 break; 2060 } 2061 if (k < SG_MAX_QUEUE) { 2062 memset(rp, 0, sizeof (Sg_request)); 2063 rp->parentfp = sfp; 2064 while (resp->nextrp) 2065 resp = resp->nextrp; 2066 resp->nextrp = rp; 2067 resp = rp; 2068 } else 2069 resp = NULL; 2070 } 2071 } 2072 if (resp) { 2073 resp->nextrp = NULL; 2074 resp->header.duration = jiffies_to_msecs(jiffies); 2075 } 2076 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2077 return resp; 2078 } 2079 2080 /* Return of 1 for found; 0 for not found */ 2081 static int 2082 sg_remove_request(Sg_fd * sfp, Sg_request * srp) 2083 { 2084 Sg_request *prev_rp; 2085 Sg_request *rp; 2086 unsigned long iflags; 2087 int res = 0; 2088 2089 if ((!sfp) || (!srp) || (!sfp->headrp)) 2090 return res; 2091 write_lock_irqsave(&sfp->rq_list_lock, iflags); 2092 prev_rp = sfp->headrp; 2093 if (srp == prev_rp) { 2094 sfp->headrp = prev_rp->nextrp; 2095 prev_rp->parentfp = NULL; 2096 res = 1; 2097 } else { 2098 while ((rp = prev_rp->nextrp)) { 2099 if (srp == rp) { 2100 prev_rp->nextrp = rp->nextrp; 2101 rp->parentfp = NULL; 2102 res = 1; 2103 break; 2104 } 2105 prev_rp = rp; 2106 } 2107 } 2108 write_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2109 return res; 2110 } 2111 2112 static Sg_fd * 2113 sg_add_sfp(Sg_device * sdp) 2114 { 2115 Sg_fd *sfp; 2116 unsigned long iflags; 2117 int bufflen; 2118 2119 sfp = kzalloc(sizeof(*sfp), GFP_ATOMIC | __GFP_NOWARN); 2120 if (!sfp) 2121 return ERR_PTR(-ENOMEM); 2122 2123 init_waitqueue_head(&sfp->read_wait); 2124 rwlock_init(&sfp->rq_list_lock); 2125 2126 kref_init(&sfp->f_ref); 2127 sfp->timeout = SG_DEFAULT_TIMEOUT; 2128 sfp->timeout_user = SG_DEFAULT_TIMEOUT_USER; 2129 sfp->force_packid = SG_DEF_FORCE_PACK_ID; 2130 sfp->low_dma = (SG_DEF_FORCE_LOW_DMA == 0) ? 2131 sdp->device->host->unchecked_isa_dma : 1; 2132 sfp->cmd_q = SG_DEF_COMMAND_Q; 2133 sfp->keep_orphan = SG_DEF_KEEP_ORPHAN; 2134 sfp->parentdp = sdp; 2135 write_lock_irqsave(&sdp->sfd_lock, iflags); 2136 if (atomic_read(&sdp->detaching)) { 2137 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2138 return ERR_PTR(-ENODEV); 2139 } 2140 list_add_tail(&sfp->sfd_siblings, &sdp->sfds); 2141 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2142 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 2143 "sg_add_sfp: sfp=0x%p\n", sfp)); 2144 if (unlikely(sg_big_buff != def_reserved_size)) 2145 sg_big_buff = def_reserved_size; 2146 2147 bufflen = min_t(int, sg_big_buff, 2148 max_sectors_bytes(sdp->device->request_queue)); 2149 sg_build_reserve(sfp, bufflen); 2150 SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, 2151 "sg_add_sfp: bufflen=%d, k_use_sg=%d\n", 2152 sfp->reserve.bufflen, 2153 sfp->reserve.k_use_sg)); 2154 2155 kref_get(&sdp->d_ref); 2156 __module_get(THIS_MODULE); 2157 return sfp; 2158 } 2159 2160 static void 2161 sg_remove_sfp_usercontext(struct work_struct *work) 2162 { 2163 struct sg_fd *sfp = container_of(work, struct sg_fd, ew.work); 2164 struct sg_device *sdp = sfp->parentdp; 2165 2166 /* Cleanup any responses which were never read(). */ 2167 while (sfp->headrp) 2168 sg_finish_rem_req(sfp->headrp); 2169 2170 if (sfp->reserve.bufflen > 0) { 2171 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, 2172 "sg_remove_sfp: bufflen=%d, k_use_sg=%d\n", 2173 (int) sfp->reserve.bufflen, 2174 (int) sfp->reserve.k_use_sg)); 2175 sg_remove_scat(sfp, &sfp->reserve); 2176 } 2177 2178 SCSI_LOG_TIMEOUT(6, sg_printk(KERN_INFO, sdp, 2179 "sg_remove_sfp: sfp=0x%p\n", sfp)); 2180 kfree(sfp); 2181 2182 scsi_device_put(sdp->device); 2183 kref_put(&sdp->d_ref, sg_device_destroy); 2184 module_put(THIS_MODULE); 2185 } 2186 2187 static void 2188 sg_remove_sfp(struct kref *kref) 2189 { 2190 struct sg_fd *sfp = container_of(kref, struct sg_fd, f_ref); 2191 struct sg_device *sdp = sfp->parentdp; 2192 unsigned long iflags; 2193 2194 write_lock_irqsave(&sdp->sfd_lock, iflags); 2195 list_del(&sfp->sfd_siblings); 2196 write_unlock_irqrestore(&sdp->sfd_lock, iflags); 2197 2198 INIT_WORK(&sfp->ew.work, sg_remove_sfp_usercontext); 2199 schedule_work(&sfp->ew.work); 2200 } 2201 2202 static int 2203 sg_res_in_use(Sg_fd * sfp) 2204 { 2205 const Sg_request *srp; 2206 unsigned long iflags; 2207 2208 read_lock_irqsave(&sfp->rq_list_lock, iflags); 2209 for (srp = sfp->headrp; srp; srp = srp->nextrp) 2210 if (srp->res_used) 2211 break; 2212 read_unlock_irqrestore(&sfp->rq_list_lock, iflags); 2213 return srp ? 1 : 0; 2214 } 2215 2216 #ifdef CONFIG_SCSI_PROC_FS 2217 static int 2218 sg_idr_max_id(int id, void *p, void *data) 2219 { 2220 int *k = data; 2221 2222 if (*k < id) 2223 *k = id; 2224 2225 return 0; 2226 } 2227 2228 static int 2229 sg_last_dev(void) 2230 { 2231 int k = -1; 2232 unsigned long iflags; 2233 2234 read_lock_irqsave(&sg_index_lock, iflags); 2235 idr_for_each(&sg_index_idr, sg_idr_max_id, &k); 2236 read_unlock_irqrestore(&sg_index_lock, iflags); 2237 return k + 1; /* origin 1 */ 2238 } 2239 #endif 2240 2241 /* must be called with sg_index_lock held */ 2242 static Sg_device *sg_lookup_dev(int dev) 2243 { 2244 return idr_find(&sg_index_idr, dev); 2245 } 2246 2247 static Sg_device * 2248 sg_get_dev(int dev) 2249 { 2250 struct sg_device *sdp; 2251 unsigned long flags; 2252 2253 read_lock_irqsave(&sg_index_lock, flags); 2254 sdp = sg_lookup_dev(dev); 2255 if (!sdp) 2256 sdp = ERR_PTR(-ENXIO); 2257 else if (atomic_read(&sdp->detaching)) { 2258 /* If sdp->detaching, then the refcount may already be 0, in 2259 * which case it would be a bug to do kref_get(). 2260 */ 2261 sdp = ERR_PTR(-ENODEV); 2262 } else 2263 kref_get(&sdp->d_ref); 2264 read_unlock_irqrestore(&sg_index_lock, flags); 2265 2266 return sdp; 2267 } 2268 2269 #ifdef CONFIG_SCSI_PROC_FS 2270 2271 static struct proc_dir_entry *sg_proc_sgp = NULL; 2272 2273 static char sg_proc_sg_dirname[] = "scsi/sg"; 2274 2275 static int sg_proc_seq_show_int(struct seq_file *s, void *v); 2276 2277 static int sg_proc_single_open_adio(struct inode *inode, struct file *file); 2278 static ssize_t sg_proc_write_adio(struct file *filp, const char __user *buffer, 2279 size_t count, loff_t *off); 2280 static const struct file_operations adio_fops = { 2281 .owner = THIS_MODULE, 2282 .open = sg_proc_single_open_adio, 2283 .read = seq_read, 2284 .llseek = seq_lseek, 2285 .write = sg_proc_write_adio, 2286 .release = single_release, 2287 }; 2288 2289 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file); 2290 static ssize_t sg_proc_write_dressz(struct file *filp, 2291 const char __user *buffer, size_t count, loff_t *off); 2292 static const struct file_operations dressz_fops = { 2293 .owner = THIS_MODULE, 2294 .open = sg_proc_single_open_dressz, 2295 .read = seq_read, 2296 .llseek = seq_lseek, 2297 .write = sg_proc_write_dressz, 2298 .release = single_release, 2299 }; 2300 2301 static int sg_proc_seq_show_version(struct seq_file *s, void *v); 2302 static int sg_proc_single_open_version(struct inode *inode, struct file *file); 2303 static const struct file_operations version_fops = { 2304 .owner = THIS_MODULE, 2305 .open = sg_proc_single_open_version, 2306 .read = seq_read, 2307 .llseek = seq_lseek, 2308 .release = single_release, 2309 }; 2310 2311 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v); 2312 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file); 2313 static const struct file_operations devhdr_fops = { 2314 .owner = THIS_MODULE, 2315 .open = sg_proc_single_open_devhdr, 2316 .read = seq_read, 2317 .llseek = seq_lseek, 2318 .release = single_release, 2319 }; 2320 2321 static int sg_proc_seq_show_dev(struct seq_file *s, void *v); 2322 static int sg_proc_open_dev(struct inode *inode, struct file *file); 2323 static void * dev_seq_start(struct seq_file *s, loff_t *pos); 2324 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos); 2325 static void dev_seq_stop(struct seq_file *s, void *v); 2326 static const struct file_operations dev_fops = { 2327 .owner = THIS_MODULE, 2328 .open = sg_proc_open_dev, 2329 .read = seq_read, 2330 .llseek = seq_lseek, 2331 .release = seq_release, 2332 }; 2333 static const struct seq_operations dev_seq_ops = { 2334 .start = dev_seq_start, 2335 .next = dev_seq_next, 2336 .stop = dev_seq_stop, 2337 .show = sg_proc_seq_show_dev, 2338 }; 2339 2340 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v); 2341 static int sg_proc_open_devstrs(struct inode *inode, struct file *file); 2342 static const struct file_operations devstrs_fops = { 2343 .owner = THIS_MODULE, 2344 .open = sg_proc_open_devstrs, 2345 .read = seq_read, 2346 .llseek = seq_lseek, 2347 .release = seq_release, 2348 }; 2349 static const struct seq_operations devstrs_seq_ops = { 2350 .start = dev_seq_start, 2351 .next = dev_seq_next, 2352 .stop = dev_seq_stop, 2353 .show = sg_proc_seq_show_devstrs, 2354 }; 2355 2356 static int sg_proc_seq_show_debug(struct seq_file *s, void *v); 2357 static int sg_proc_open_debug(struct inode *inode, struct file *file); 2358 static const struct file_operations debug_fops = { 2359 .owner = THIS_MODULE, 2360 .open = sg_proc_open_debug, 2361 .read = seq_read, 2362 .llseek = seq_lseek, 2363 .release = seq_release, 2364 }; 2365 static const struct seq_operations debug_seq_ops = { 2366 .start = dev_seq_start, 2367 .next = dev_seq_next, 2368 .stop = dev_seq_stop, 2369 .show = sg_proc_seq_show_debug, 2370 }; 2371 2372 2373 struct sg_proc_leaf { 2374 const char * name; 2375 const struct file_operations * fops; 2376 }; 2377 2378 static const struct sg_proc_leaf sg_proc_leaf_arr[] = { 2379 {"allow_dio", &adio_fops}, 2380 {"debug", &debug_fops}, 2381 {"def_reserved_size", &dressz_fops}, 2382 {"device_hdr", &devhdr_fops}, 2383 {"devices", &dev_fops}, 2384 {"device_strs", &devstrs_fops}, 2385 {"version", &version_fops} 2386 }; 2387 2388 static int 2389 sg_proc_init(void) 2390 { 2391 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2392 int k; 2393 2394 sg_proc_sgp = proc_mkdir(sg_proc_sg_dirname, NULL); 2395 if (!sg_proc_sgp) 2396 return 1; 2397 for (k = 0; k < num_leaves; ++k) { 2398 const struct sg_proc_leaf *leaf = &sg_proc_leaf_arr[k]; 2399 umode_t mask = leaf->fops->write ? S_IRUGO | S_IWUSR : S_IRUGO; 2400 proc_create(leaf->name, mask, sg_proc_sgp, leaf->fops); 2401 } 2402 return 0; 2403 } 2404 2405 static void 2406 sg_proc_cleanup(void) 2407 { 2408 int k; 2409 int num_leaves = ARRAY_SIZE(sg_proc_leaf_arr); 2410 2411 if (!sg_proc_sgp) 2412 return; 2413 for (k = 0; k < num_leaves; ++k) 2414 remove_proc_entry(sg_proc_leaf_arr[k].name, sg_proc_sgp); 2415 remove_proc_entry(sg_proc_sg_dirname, NULL); 2416 } 2417 2418 2419 static int sg_proc_seq_show_int(struct seq_file *s, void *v) 2420 { 2421 seq_printf(s, "%d\n", *((int *)s->private)); 2422 return 0; 2423 } 2424 2425 static int sg_proc_single_open_adio(struct inode *inode, struct file *file) 2426 { 2427 return single_open(file, sg_proc_seq_show_int, &sg_allow_dio); 2428 } 2429 2430 static ssize_t 2431 sg_proc_write_adio(struct file *filp, const char __user *buffer, 2432 size_t count, loff_t *off) 2433 { 2434 int err; 2435 unsigned long num; 2436 2437 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2438 return -EACCES; 2439 err = kstrtoul_from_user(buffer, count, 0, &num); 2440 if (err) 2441 return err; 2442 sg_allow_dio = num ? 1 : 0; 2443 return count; 2444 } 2445 2446 static int sg_proc_single_open_dressz(struct inode *inode, struct file *file) 2447 { 2448 return single_open(file, sg_proc_seq_show_int, &sg_big_buff); 2449 } 2450 2451 static ssize_t 2452 sg_proc_write_dressz(struct file *filp, const char __user *buffer, 2453 size_t count, loff_t *off) 2454 { 2455 int err; 2456 unsigned long k = ULONG_MAX; 2457 2458 if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO)) 2459 return -EACCES; 2460 2461 err = kstrtoul_from_user(buffer, count, 0, &k); 2462 if (err) 2463 return err; 2464 if (k <= 1048576) { /* limit "big buff" to 1 MB */ 2465 sg_big_buff = k; 2466 return count; 2467 } 2468 return -ERANGE; 2469 } 2470 2471 static int sg_proc_seq_show_version(struct seq_file *s, void *v) 2472 { 2473 seq_printf(s, "%d\t%s [%s]\n", sg_version_num, SG_VERSION_STR, 2474 sg_version_date); 2475 return 0; 2476 } 2477 2478 static int sg_proc_single_open_version(struct inode *inode, struct file *file) 2479 { 2480 return single_open(file, sg_proc_seq_show_version, NULL); 2481 } 2482 2483 static int sg_proc_seq_show_devhdr(struct seq_file *s, void *v) 2484 { 2485 seq_puts(s, "host\tchan\tid\tlun\ttype\topens\tqdepth\tbusy\tonline\n"); 2486 return 0; 2487 } 2488 2489 static int sg_proc_single_open_devhdr(struct inode *inode, struct file *file) 2490 { 2491 return single_open(file, sg_proc_seq_show_devhdr, NULL); 2492 } 2493 2494 struct sg_proc_deviter { 2495 loff_t index; 2496 size_t max; 2497 }; 2498 2499 static void * dev_seq_start(struct seq_file *s, loff_t *pos) 2500 { 2501 struct sg_proc_deviter * it = kmalloc(sizeof(*it), GFP_KERNEL); 2502 2503 s->private = it; 2504 if (! it) 2505 return NULL; 2506 2507 it->index = *pos; 2508 it->max = sg_last_dev(); 2509 if (it->index >= it->max) 2510 return NULL; 2511 return it; 2512 } 2513 2514 static void * dev_seq_next(struct seq_file *s, void *v, loff_t *pos) 2515 { 2516 struct sg_proc_deviter * it = s->private; 2517 2518 *pos = ++it->index; 2519 return (it->index < it->max) ? it : NULL; 2520 } 2521 2522 static void dev_seq_stop(struct seq_file *s, void *v) 2523 { 2524 kfree(s->private); 2525 } 2526 2527 static int sg_proc_open_dev(struct inode *inode, struct file *file) 2528 { 2529 return seq_open(file, &dev_seq_ops); 2530 } 2531 2532 static int sg_proc_seq_show_dev(struct seq_file *s, void *v) 2533 { 2534 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2535 Sg_device *sdp; 2536 struct scsi_device *scsidp; 2537 unsigned long iflags; 2538 2539 read_lock_irqsave(&sg_index_lock, iflags); 2540 sdp = it ? sg_lookup_dev(it->index) : NULL; 2541 if ((NULL == sdp) || (NULL == sdp->device) || 2542 (atomic_read(&sdp->detaching))) 2543 seq_puts(s, "-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\t-1\n"); 2544 else { 2545 scsidp = sdp->device; 2546 seq_printf(s, "%d\t%d\t%d\t%llu\t%d\t%d\t%d\t%d\t%d\n", 2547 scsidp->host->host_no, scsidp->channel, 2548 scsidp->id, scsidp->lun, (int) scsidp->type, 2549 1, 2550 (int) scsidp->queue_depth, 2551 (int) atomic_read(&scsidp->device_busy), 2552 (int) scsi_device_online(scsidp)); 2553 } 2554 read_unlock_irqrestore(&sg_index_lock, iflags); 2555 return 0; 2556 } 2557 2558 static int sg_proc_open_devstrs(struct inode *inode, struct file *file) 2559 { 2560 return seq_open(file, &devstrs_seq_ops); 2561 } 2562 2563 static int sg_proc_seq_show_devstrs(struct seq_file *s, void *v) 2564 { 2565 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2566 Sg_device *sdp; 2567 struct scsi_device *scsidp; 2568 unsigned long iflags; 2569 2570 read_lock_irqsave(&sg_index_lock, iflags); 2571 sdp = it ? sg_lookup_dev(it->index) : NULL; 2572 scsidp = sdp ? sdp->device : NULL; 2573 if (sdp && scsidp && (!atomic_read(&sdp->detaching))) 2574 seq_printf(s, "%8.8s\t%16.16s\t%4.4s\n", 2575 scsidp->vendor, scsidp->model, scsidp->rev); 2576 else 2577 seq_puts(s, "<no active device>\n"); 2578 read_unlock_irqrestore(&sg_index_lock, iflags); 2579 return 0; 2580 } 2581 2582 /* must be called while holding sg_index_lock */ 2583 static void sg_proc_debug_helper(struct seq_file *s, Sg_device * sdp) 2584 { 2585 int k, m, new_interface, blen, usg; 2586 Sg_request *srp; 2587 Sg_fd *fp; 2588 const sg_io_hdr_t *hp; 2589 const char * cp; 2590 unsigned int ms; 2591 2592 k = 0; 2593 list_for_each_entry(fp, &sdp->sfds, sfd_siblings) { 2594 k++; 2595 read_lock(&fp->rq_list_lock); /* irqs already disabled */ 2596 seq_printf(s, " FD(%d): timeout=%dms bufflen=%d " 2597 "(res)sgat=%d low_dma=%d\n", k, 2598 jiffies_to_msecs(fp->timeout), 2599 fp->reserve.bufflen, 2600 (int) fp->reserve.k_use_sg, 2601 (int) fp->low_dma); 2602 seq_printf(s, " cmd_q=%d f_packid=%d k_orphan=%d closed=0\n", 2603 (int) fp->cmd_q, (int) fp->force_packid, 2604 (int) fp->keep_orphan); 2605 for (m = 0, srp = fp->headrp; 2606 srp != NULL; 2607 ++m, srp = srp->nextrp) { 2608 hp = &srp->header; 2609 new_interface = (hp->interface_id == '\0') ? 0 : 1; 2610 if (srp->res_used) { 2611 if (new_interface && 2612 (SG_FLAG_MMAP_IO & hp->flags)) 2613 cp = " mmap>> "; 2614 else 2615 cp = " rb>> "; 2616 } else { 2617 if (SG_INFO_DIRECT_IO_MASK & hp->info) 2618 cp = " dio>> "; 2619 else 2620 cp = " "; 2621 } 2622 seq_puts(s, cp); 2623 blen = srp->data.bufflen; 2624 usg = srp->data.k_use_sg; 2625 seq_puts(s, srp->done ? 2626 ((1 == srp->done) ? "rcv:" : "fin:") 2627 : "act:"); 2628 seq_printf(s, " id=%d blen=%d", 2629 srp->header.pack_id, blen); 2630 if (srp->done) 2631 seq_printf(s, " dur=%d", hp->duration); 2632 else { 2633 ms = jiffies_to_msecs(jiffies); 2634 seq_printf(s, " t_o/elap=%d/%d", 2635 (new_interface ? hp->timeout : 2636 jiffies_to_msecs(fp->timeout)), 2637 (ms > hp->duration ? ms - hp->duration : 0)); 2638 } 2639 seq_printf(s, "ms sgat=%d op=0x%02x\n", usg, 2640 (int) srp->data.cmd_opcode); 2641 } 2642 if (0 == m) 2643 seq_puts(s, " No requests active\n"); 2644 read_unlock(&fp->rq_list_lock); 2645 } 2646 } 2647 2648 static int sg_proc_open_debug(struct inode *inode, struct file *file) 2649 { 2650 return seq_open(file, &debug_seq_ops); 2651 } 2652 2653 static int sg_proc_seq_show_debug(struct seq_file *s, void *v) 2654 { 2655 struct sg_proc_deviter * it = (struct sg_proc_deviter *) v; 2656 Sg_device *sdp; 2657 unsigned long iflags; 2658 2659 if (it && (0 == it->index)) 2660 seq_printf(s, "max_active_device=%d def_reserved_size=%d\n", 2661 (int)it->max, sg_big_buff); 2662 2663 read_lock_irqsave(&sg_index_lock, iflags); 2664 sdp = it ? sg_lookup_dev(it->index) : NULL; 2665 if (NULL == sdp) 2666 goto skip; 2667 read_lock(&sdp->sfd_lock); 2668 if (!list_empty(&sdp->sfds)) { 2669 seq_printf(s, " >>> device=%s ", sdp->disk->disk_name); 2670 if (atomic_read(&sdp->detaching)) 2671 seq_puts(s, "detaching pending close "); 2672 else if (sdp->device) { 2673 struct scsi_device *scsidp = sdp->device; 2674 2675 seq_printf(s, "%d:%d:%d:%llu em=%d", 2676 scsidp->host->host_no, 2677 scsidp->channel, scsidp->id, 2678 scsidp->lun, 2679 scsidp->host->hostt->emulated); 2680 } 2681 seq_printf(s, " sg_tablesize=%d excl=%d open_cnt=%d\n", 2682 sdp->sg_tablesize, sdp->exclude, sdp->open_cnt); 2683 sg_proc_debug_helper(s, sdp); 2684 } 2685 read_unlock(&sdp->sfd_lock); 2686 skip: 2687 read_unlock_irqrestore(&sg_index_lock, iflags); 2688 return 0; 2689 } 2690 2691 #endif /* CONFIG_SCSI_PROC_FS */ 2692 2693 module_init(init_sg); 2694 module_exit(exit_sg); 2695