1 /******************************************************************************* 2 * Filename: target_core_file.c 3 * 4 * This file contains the Storage Engine <-> FILEIO transport specific functions 5 * 6 * (c) Copyright 2005-2012 RisingTide Systems LLC. 7 * 8 * Nicholas A. Bellinger <nab@kernel.org> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23 * 24 ******************************************************************************/ 25 26 #include <linux/string.h> 27 #include <linux/parser.h> 28 #include <linux/timer.h> 29 #include <linux/blkdev.h> 30 #include <linux/slab.h> 31 #include <linux/spinlock.h> 32 #include <linux/module.h> 33 #include <linux/falloc.h> 34 #include <scsi/scsi.h> 35 #include <scsi/scsi_host.h> 36 #include <asm/unaligned.h> 37 38 #include <target/target_core_base.h> 39 #include <target/target_core_backend.h> 40 41 #include "target_core_file.h" 42 43 static inline struct fd_dev *FD_DEV(struct se_device *dev) 44 { 45 return container_of(dev, struct fd_dev, dev); 46 } 47 48 /* fd_attach_hba(): (Part of se_subsystem_api_t template) 49 * 50 * 51 */ 52 static int fd_attach_hba(struct se_hba *hba, u32 host_id) 53 { 54 struct fd_host *fd_host; 55 56 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 57 if (!fd_host) { 58 pr_err("Unable to allocate memory for struct fd_host\n"); 59 return -ENOMEM; 60 } 61 62 fd_host->fd_host_id = host_id; 63 64 hba->hba_ptr = fd_host; 65 66 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 67 " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 68 TARGET_CORE_MOD_VERSION); 69 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic" 70 " MaxSectors: %u\n", 71 hba->hba_id, fd_host->fd_host_id, FD_MAX_SECTORS); 72 73 return 0; 74 } 75 76 static void fd_detach_hba(struct se_hba *hba) 77 { 78 struct fd_host *fd_host = hba->hba_ptr; 79 80 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 81 " Target Core\n", hba->hba_id, fd_host->fd_host_id); 82 83 kfree(fd_host); 84 hba->hba_ptr = NULL; 85 } 86 87 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 88 { 89 struct fd_dev *fd_dev; 90 struct fd_host *fd_host = hba->hba_ptr; 91 92 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 93 if (!fd_dev) { 94 pr_err("Unable to allocate memory for struct fd_dev\n"); 95 return NULL; 96 } 97 98 fd_dev->fd_host = fd_host; 99 100 pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 101 102 return &fd_dev->dev; 103 } 104 105 static int fd_configure_device(struct se_device *dev) 106 { 107 struct fd_dev *fd_dev = FD_DEV(dev); 108 struct fd_host *fd_host = dev->se_hba->hba_ptr; 109 struct file *file; 110 struct inode *inode = NULL; 111 int flags, ret = -EINVAL; 112 113 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 114 pr_err("Missing fd_dev_name=\n"); 115 return -EINVAL; 116 } 117 118 /* 119 * Use O_DSYNC by default instead of O_SYNC to forgo syncing 120 * of pure timestamp updates. 121 */ 122 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 123 124 /* 125 * Optionally allow fd_buffered_io=1 to be enabled for people 126 * who want use the fs buffer cache as an WriteCache mechanism. 127 * 128 * This means that in event of a hard failure, there is a risk 129 * of silent data-loss if the SCSI client has *not* performed a 130 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 131 * to write-out the entire device cache. 132 */ 133 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 134 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 135 flags &= ~O_DSYNC; 136 } 137 138 file = filp_open(fd_dev->fd_dev_name, flags, 0600); 139 if (IS_ERR(file)) { 140 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 141 ret = PTR_ERR(file); 142 goto fail; 143 } 144 fd_dev->fd_file = file; 145 /* 146 * If using a block backend with this struct file, we extract 147 * fd_dev->fd_[block,dev]_size from struct block_device. 148 * 149 * Otherwise, we use the passed fd_size= from configfs 150 */ 151 inode = file->f_mapping->host; 152 if (S_ISBLK(inode->i_mode)) { 153 struct request_queue *q = bdev_get_queue(inode->i_bdev); 154 unsigned long long dev_size; 155 156 dev->dev_attrib.hw_block_size = 157 bdev_logical_block_size(inode->i_bdev); 158 dev->dev_attrib.hw_max_sectors = queue_max_hw_sectors(q); 159 160 /* 161 * Determine the number of bytes from i_size_read() minus 162 * one (1) logical sector from underlying struct block_device 163 */ 164 dev_size = (i_size_read(file->f_mapping->host) - 165 fd_dev->fd_block_size); 166 167 pr_debug("FILEIO: Using size: %llu bytes from struct" 168 " block_device blocks: %llu logical_block_size: %d\n", 169 dev_size, div_u64(dev_size, fd_dev->fd_block_size), 170 fd_dev->fd_block_size); 171 /* 172 * Check if the underlying struct block_device request_queue supports 173 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 174 * in ATA and we need to set TPE=1 175 */ 176 if (blk_queue_discard(q)) { 177 dev->dev_attrib.max_unmap_lba_count = 178 q->limits.max_discard_sectors; 179 /* 180 * Currently hardcoded to 1 in Linux/SCSI code.. 181 */ 182 dev->dev_attrib.max_unmap_block_desc_count = 1; 183 dev->dev_attrib.unmap_granularity = 184 q->limits.discard_granularity >> 9; 185 dev->dev_attrib.unmap_granularity_alignment = 186 q->limits.discard_alignment; 187 pr_debug("IFILE: BLOCK Discard support available," 188 " disabled by default\n"); 189 } 190 /* 191 * Enable write same emulation for IBLOCK and use 0xFFFF as 192 * the smaller WRITE_SAME(10) only has a two-byte block count. 193 */ 194 dev->dev_attrib.max_write_same_len = 0xFFFF; 195 196 if (blk_queue_nonrot(q)) 197 dev->dev_attrib.is_nonrot = 1; 198 } else { 199 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 200 pr_err("FILEIO: Missing fd_dev_size=" 201 " parameter, and no backing struct" 202 " block_device\n"); 203 goto fail; 204 } 205 206 dev->dev_attrib.hw_block_size = FD_BLOCKSIZE; 207 dev->dev_attrib.hw_max_sectors = FD_MAX_SECTORS; 208 209 /* 210 * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 211 */ 212 dev->dev_attrib.max_unmap_lba_count = 0x2000; 213 /* 214 * Currently hardcoded to 1 in Linux/SCSI code.. 215 */ 216 dev->dev_attrib.max_unmap_block_desc_count = 1; 217 dev->dev_attrib.unmap_granularity = 1; 218 dev->dev_attrib.unmap_granularity_alignment = 0; 219 220 /* 221 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 222 * based upon struct iovec limit for vfs_writev() 223 */ 224 dev->dev_attrib.max_write_same_len = 0x1000; 225 } 226 227 fd_dev->fd_block_size = dev->dev_attrib.hw_block_size; 228 229 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 230 231 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 232 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 233 " with FDBD_HAS_BUFFERED_IO_WCE\n"); 234 dev->dev_attrib.emulate_write_cache = 1; 235 } 236 237 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 238 fd_dev->fd_queue_depth = dev->queue_depth; 239 240 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 241 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 242 fd_dev->fd_dev_name, fd_dev->fd_dev_size); 243 244 return 0; 245 fail: 246 if (fd_dev->fd_file) { 247 filp_close(fd_dev->fd_file, NULL); 248 fd_dev->fd_file = NULL; 249 } 250 return ret; 251 } 252 253 static void fd_free_device(struct se_device *dev) 254 { 255 struct fd_dev *fd_dev = FD_DEV(dev); 256 257 if (fd_dev->fd_file) { 258 filp_close(fd_dev->fd_file, NULL); 259 fd_dev->fd_file = NULL; 260 } 261 262 kfree(fd_dev); 263 } 264 265 static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 266 u32 sgl_nents, int is_write) 267 { 268 struct se_device *se_dev = cmd->se_dev; 269 struct fd_dev *dev = FD_DEV(se_dev); 270 struct file *fd = dev->fd_file; 271 struct scatterlist *sg; 272 struct iovec *iov; 273 mm_segment_t old_fs; 274 loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 275 int ret = 0, i; 276 277 iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 278 if (!iov) { 279 pr_err("Unable to allocate fd_do_readv iov[]\n"); 280 return -ENOMEM; 281 } 282 283 for_each_sg(sgl, sg, sgl_nents, i) { 284 iov[i].iov_len = sg->length; 285 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; 286 } 287 288 old_fs = get_fs(); 289 set_fs(get_ds()); 290 291 if (is_write) 292 ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 293 else 294 ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 295 296 set_fs(old_fs); 297 298 for_each_sg(sgl, sg, sgl_nents, i) 299 kunmap(sg_page(sg)); 300 301 kfree(iov); 302 303 if (is_write) { 304 if (ret < 0 || ret != cmd->data_length) { 305 pr_err("%s() write returned %d\n", __func__, ret); 306 return (ret < 0 ? ret : -EINVAL); 307 } 308 } else { 309 /* 310 * Return zeros and GOOD status even if the READ did not return 311 * the expected virt_size for struct file w/o a backing struct 312 * block_device. 313 */ 314 if (S_ISBLK(file_inode(fd)->i_mode)) { 315 if (ret < 0 || ret != cmd->data_length) { 316 pr_err("%s() returned %d, expecting %u for " 317 "S_ISBLK\n", __func__, ret, 318 cmd->data_length); 319 return (ret < 0 ? ret : -EINVAL); 320 } 321 } else { 322 if (ret < 0) { 323 pr_err("%s() returned %d for non S_ISBLK\n", 324 __func__, ret); 325 return ret; 326 } 327 } 328 } 329 return 1; 330 } 331 332 static sense_reason_t 333 fd_execute_sync_cache(struct se_cmd *cmd) 334 { 335 struct se_device *dev = cmd->se_dev; 336 struct fd_dev *fd_dev = FD_DEV(dev); 337 int immed = (cmd->t_task_cdb[1] & 0x2); 338 loff_t start, end; 339 int ret; 340 341 /* 342 * If the Immediate bit is set, queue up the GOOD response 343 * for this SYNCHRONIZE_CACHE op 344 */ 345 if (immed) 346 target_complete_cmd(cmd, SAM_STAT_GOOD); 347 348 /* 349 * Determine if we will be flushing the entire device. 350 */ 351 if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 352 start = 0; 353 end = LLONG_MAX; 354 } else { 355 start = cmd->t_task_lba * dev->dev_attrib.block_size; 356 if (cmd->data_length) 357 end = start + cmd->data_length; 358 else 359 end = LLONG_MAX; 360 } 361 362 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 363 if (ret != 0) 364 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 365 366 if (immed) 367 return 0; 368 369 if (ret) 370 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 371 else 372 target_complete_cmd(cmd, SAM_STAT_GOOD); 373 374 return 0; 375 } 376 377 static unsigned char * 378 fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, 379 unsigned int len) 380 { 381 struct se_device *se_dev = cmd->se_dev; 382 unsigned int block_size = se_dev->dev_attrib.block_size; 383 unsigned int i = 0, end; 384 unsigned char *buf, *p, *kmap_buf; 385 386 buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); 387 if (!buf) { 388 pr_err("Unable to allocate fd_execute_write_same buf\n"); 389 return NULL; 390 } 391 392 kmap_buf = kmap(sg_page(sg)) + sg->offset; 393 if (!kmap_buf) { 394 pr_err("kmap() failed in fd_setup_write_same\n"); 395 kfree(buf); 396 return NULL; 397 } 398 /* 399 * Fill local *buf to contain multiple WRITE_SAME blocks up to 400 * min(len, PAGE_SIZE) 401 */ 402 p = buf; 403 end = min_t(unsigned int, len, PAGE_SIZE); 404 405 while (i < end) { 406 memcpy(p, kmap_buf, block_size); 407 408 i += block_size; 409 p += block_size; 410 } 411 kunmap(sg_page(sg)); 412 413 return buf; 414 } 415 416 static sense_reason_t 417 fd_execute_write_same(struct se_cmd *cmd) 418 { 419 struct se_device *se_dev = cmd->se_dev; 420 struct fd_dev *fd_dev = FD_DEV(se_dev); 421 struct file *f = fd_dev->fd_file; 422 struct scatterlist *sg; 423 struct iovec *iov; 424 mm_segment_t old_fs; 425 sector_t nolb = sbc_get_write_same_sectors(cmd); 426 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 427 unsigned int len, len_tmp, iov_num; 428 int i, rc; 429 unsigned char *buf; 430 431 if (!nolb) { 432 target_complete_cmd(cmd, SAM_STAT_GOOD); 433 return 0; 434 } 435 sg = &cmd->t_data_sg[0]; 436 437 if (cmd->t_data_nents > 1 || 438 sg->length != cmd->se_dev->dev_attrib.block_size) { 439 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 440 " block_size: %u\n", cmd->t_data_nents, sg->length, 441 cmd->se_dev->dev_attrib.block_size); 442 return TCM_INVALID_CDB_FIELD; 443 } 444 445 len = len_tmp = nolb * se_dev->dev_attrib.block_size; 446 iov_num = DIV_ROUND_UP(len, PAGE_SIZE); 447 448 buf = fd_setup_write_same_buf(cmd, sg, len); 449 if (!buf) 450 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 451 452 iov = vzalloc(sizeof(struct iovec) * iov_num); 453 if (!iov) { 454 pr_err("Unable to allocate fd_execute_write_same iovecs\n"); 455 kfree(buf); 456 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 457 } 458 /* 459 * Map the single fabric received scatterlist block now populated 460 * in *buf into each iovec for I/O submission. 461 */ 462 for (i = 0; i < iov_num; i++) { 463 iov[i].iov_base = buf; 464 iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); 465 len_tmp -= iov[i].iov_len; 466 } 467 468 old_fs = get_fs(); 469 set_fs(get_ds()); 470 rc = vfs_writev(f, &iov[0], iov_num, &pos); 471 set_fs(old_fs); 472 473 vfree(iov); 474 kfree(buf); 475 476 if (rc < 0 || rc != len) { 477 pr_err("vfs_writev() returned %d for write same\n", rc); 478 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 479 } 480 481 target_complete_cmd(cmd, SAM_STAT_GOOD); 482 return 0; 483 } 484 485 static sense_reason_t 486 fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 487 { 488 struct file *file = priv; 489 struct inode *inode = file->f_mapping->host; 490 int ret; 491 492 if (S_ISBLK(inode->i_mode)) { 493 /* The backend is block device, use discard */ 494 struct block_device *bdev = inode->i_bdev; 495 496 ret = blkdev_issue_discard(bdev, lba, 497 nolb, GFP_KERNEL, 0); 498 if (ret < 0) { 499 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 500 ret); 501 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 502 } 503 } else { 504 /* The backend is normal file, use fallocate */ 505 struct se_device *se_dev = cmd->se_dev; 506 loff_t pos = lba * se_dev->dev_attrib.block_size; 507 unsigned int len = nolb * se_dev->dev_attrib.block_size; 508 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 509 510 if (!file->f_op->fallocate) 511 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 512 513 ret = file->f_op->fallocate(file, mode, pos, len); 514 if (ret < 0) { 515 pr_warn("FILEIO: fallocate() failed: %d\n", ret); 516 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 517 } 518 } 519 520 return 0; 521 } 522 523 static sense_reason_t 524 fd_execute_write_same_unmap(struct se_cmd *cmd) 525 { 526 struct se_device *se_dev = cmd->se_dev; 527 struct fd_dev *fd_dev = FD_DEV(se_dev); 528 struct file *file = fd_dev->fd_file; 529 sector_t lba = cmd->t_task_lba; 530 sector_t nolb = sbc_get_write_same_sectors(cmd); 531 int ret; 532 533 if (!nolb) { 534 target_complete_cmd(cmd, SAM_STAT_GOOD); 535 return 0; 536 } 537 538 ret = fd_do_unmap(cmd, file, lba, nolb); 539 if (ret) 540 return ret; 541 542 target_complete_cmd(cmd, GOOD); 543 return 0; 544 } 545 546 static sense_reason_t 547 fd_execute_unmap(struct se_cmd *cmd) 548 { 549 struct file *file = FD_DEV(cmd->se_dev)->fd_file; 550 551 return sbc_execute_unmap(cmd, fd_do_unmap, file); 552 } 553 554 static sense_reason_t 555 fd_execute_rw(struct se_cmd *cmd) 556 { 557 struct scatterlist *sgl = cmd->t_data_sg; 558 u32 sgl_nents = cmd->t_data_nents; 559 enum dma_data_direction data_direction = cmd->data_direction; 560 struct se_device *dev = cmd->se_dev; 561 int ret = 0; 562 563 /* 564 * Call vectorized fileio functions to map struct scatterlist 565 * physical memory addresses to struct iovec virtual memory. 566 */ 567 if (data_direction == DMA_FROM_DEVICE) { 568 ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 569 } else { 570 ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 571 /* 572 * Perform implict vfs_fsync_range() for fd_do_writev() ops 573 * for SCSI WRITEs with Forced Unit Access (FUA) set. 574 * Allow this to happen independent of WCE=0 setting. 575 */ 576 if (ret > 0 && 577 dev->dev_attrib.emulate_fua_write > 0 && 578 (cmd->se_cmd_flags & SCF_FUA)) { 579 struct fd_dev *fd_dev = FD_DEV(dev); 580 loff_t start = cmd->t_task_lba * 581 dev->dev_attrib.block_size; 582 loff_t end = start + cmd->data_length; 583 584 vfs_fsync_range(fd_dev->fd_file, start, end, 1); 585 } 586 } 587 588 if (ret < 0) 589 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 590 591 if (ret) 592 target_complete_cmd(cmd, SAM_STAT_GOOD); 593 return 0; 594 } 595 596 enum { 597 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 598 }; 599 600 static match_table_t tokens = { 601 {Opt_fd_dev_name, "fd_dev_name=%s"}, 602 {Opt_fd_dev_size, "fd_dev_size=%s"}, 603 {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 604 {Opt_err, NULL} 605 }; 606 607 static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 608 const char *page, ssize_t count) 609 { 610 struct fd_dev *fd_dev = FD_DEV(dev); 611 char *orig, *ptr, *arg_p, *opts; 612 substring_t args[MAX_OPT_ARGS]; 613 int ret = 0, arg, token; 614 615 opts = kstrdup(page, GFP_KERNEL); 616 if (!opts) 617 return -ENOMEM; 618 619 orig = opts; 620 621 while ((ptr = strsep(&opts, ",\n")) != NULL) { 622 if (!*ptr) 623 continue; 624 625 token = match_token(ptr, tokens, args); 626 switch (token) { 627 case Opt_fd_dev_name: 628 if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 629 FD_MAX_DEV_NAME) == 0) { 630 ret = -EINVAL; 631 break; 632 } 633 pr_debug("FILEIO: Referencing Path: %s\n", 634 fd_dev->fd_dev_name); 635 fd_dev->fbd_flags |= FBDF_HAS_PATH; 636 break; 637 case Opt_fd_dev_size: 638 arg_p = match_strdup(&args[0]); 639 if (!arg_p) { 640 ret = -ENOMEM; 641 break; 642 } 643 ret = strict_strtoull(arg_p, 0, &fd_dev->fd_dev_size); 644 kfree(arg_p); 645 if (ret < 0) { 646 pr_err("strict_strtoull() failed for" 647 " fd_dev_size=\n"); 648 goto out; 649 } 650 pr_debug("FILEIO: Referencing Size: %llu" 651 " bytes\n", fd_dev->fd_dev_size); 652 fd_dev->fbd_flags |= FBDF_HAS_SIZE; 653 break; 654 case Opt_fd_buffered_io: 655 match_int(args, &arg); 656 if (arg != 1) { 657 pr_err("bogus fd_buffered_io=%d value\n", arg); 658 ret = -EINVAL; 659 goto out; 660 } 661 662 pr_debug("FILEIO: Using buffered I/O" 663 " operations for struct fd_dev\n"); 664 665 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 666 break; 667 default: 668 break; 669 } 670 } 671 672 out: 673 kfree(orig); 674 return (!ret) ? count : ret; 675 } 676 677 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 678 { 679 struct fd_dev *fd_dev = FD_DEV(dev); 680 ssize_t bl = 0; 681 682 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 683 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 684 fd_dev->fd_dev_name, fd_dev->fd_dev_size, 685 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 686 "Buffered-WCE" : "O_DSYNC"); 687 return bl; 688 } 689 690 static sector_t fd_get_blocks(struct se_device *dev) 691 { 692 struct fd_dev *fd_dev = FD_DEV(dev); 693 struct file *f = fd_dev->fd_file; 694 struct inode *i = f->f_mapping->host; 695 unsigned long long dev_size; 696 /* 697 * When using a file that references an underlying struct block_device, 698 * ensure dev_size is always based on the current inode size in order 699 * to handle underlying block_device resize operations. 700 */ 701 if (S_ISBLK(i->i_mode)) 702 dev_size = (i_size_read(i) - fd_dev->fd_block_size); 703 else 704 dev_size = fd_dev->fd_dev_size; 705 706 return div_u64(dev_size, dev->dev_attrib.block_size); 707 } 708 709 static struct sbc_ops fd_sbc_ops = { 710 .execute_rw = fd_execute_rw, 711 .execute_sync_cache = fd_execute_sync_cache, 712 .execute_write_same = fd_execute_write_same, 713 .execute_write_same_unmap = fd_execute_write_same_unmap, 714 .execute_unmap = fd_execute_unmap, 715 }; 716 717 static sense_reason_t 718 fd_parse_cdb(struct se_cmd *cmd) 719 { 720 return sbc_parse_cdb(cmd, &fd_sbc_ops); 721 } 722 723 static struct se_subsystem_api fileio_template = { 724 .name = "fileio", 725 .inquiry_prod = "FILEIO", 726 .inquiry_rev = FD_VERSION, 727 .owner = THIS_MODULE, 728 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 729 .attach_hba = fd_attach_hba, 730 .detach_hba = fd_detach_hba, 731 .alloc_device = fd_alloc_device, 732 .configure_device = fd_configure_device, 733 .free_device = fd_free_device, 734 .parse_cdb = fd_parse_cdb, 735 .set_configfs_dev_params = fd_set_configfs_dev_params, 736 .show_configfs_dev_params = fd_show_configfs_dev_params, 737 .get_device_type = sbc_get_device_type, 738 .get_blocks = fd_get_blocks, 739 }; 740 741 static int __init fileio_module_init(void) 742 { 743 return transport_subsystem_register(&fileio_template); 744 } 745 746 static void __exit fileio_module_exit(void) 747 { 748 transport_subsystem_release(&fileio_template); 749 } 750 751 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 752 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 753 MODULE_LICENSE("GPL"); 754 755 module_init(fileio_module_init); 756 module_exit(fileio_module_exit); 757