1 /******************************************************************************* 2 * Filename: target_core_file.c 3 * 4 * This file contains the Storage Engine <-> FILEIO transport specific functions 5 * 6 * (c) Copyright 2005-2013 Datera, Inc. 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\n", 70 hba->hba_id, fd_host->fd_host_id); 71 72 return 0; 73 } 74 75 static void fd_detach_hba(struct se_hba *hba) 76 { 77 struct fd_host *fd_host = hba->hba_ptr; 78 79 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 80 " Target Core\n", hba->hba_id, fd_host->fd_host_id); 81 82 kfree(fd_host); 83 hba->hba_ptr = NULL; 84 } 85 86 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 87 { 88 struct fd_dev *fd_dev; 89 struct fd_host *fd_host = hba->hba_ptr; 90 91 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 92 if (!fd_dev) { 93 pr_err("Unable to allocate memory for struct fd_dev\n"); 94 return NULL; 95 } 96 97 fd_dev->fd_host = fd_host; 98 99 pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 100 101 return &fd_dev->dev; 102 } 103 104 static int fd_configure_device(struct se_device *dev) 105 { 106 struct fd_dev *fd_dev = FD_DEV(dev); 107 struct fd_host *fd_host = dev->se_hba->hba_ptr; 108 struct file *file; 109 struct inode *inode = NULL; 110 int flags, ret = -EINVAL; 111 112 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 113 pr_err("Missing fd_dev_name=\n"); 114 return -EINVAL; 115 } 116 117 /* 118 * Use O_DSYNC by default instead of O_SYNC to forgo syncing 119 * of pure timestamp updates. 120 */ 121 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 122 123 /* 124 * Optionally allow fd_buffered_io=1 to be enabled for people 125 * who want use the fs buffer cache as an WriteCache mechanism. 126 * 127 * This means that in event of a hard failure, there is a risk 128 * of silent data-loss if the SCSI client has *not* performed a 129 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 130 * to write-out the entire device cache. 131 */ 132 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 133 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 134 flags &= ~O_DSYNC; 135 } 136 137 file = filp_open(fd_dev->fd_dev_name, flags, 0600); 138 if (IS_ERR(file)) { 139 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 140 ret = PTR_ERR(file); 141 goto fail; 142 } 143 fd_dev->fd_file = file; 144 /* 145 * If using a block backend with this struct file, we extract 146 * fd_dev->fd_[block,dev]_size from struct block_device. 147 * 148 * Otherwise, we use the passed fd_size= from configfs 149 */ 150 inode = file->f_mapping->host; 151 if (S_ISBLK(inode->i_mode)) { 152 struct request_queue *q = bdev_get_queue(inode->i_bdev); 153 unsigned long long dev_size; 154 155 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 156 /* 157 * Determine the number of bytes from i_size_read() minus 158 * one (1) logical sector from underlying struct block_device 159 */ 160 dev_size = (i_size_read(file->f_mapping->host) - 161 fd_dev->fd_block_size); 162 163 pr_debug("FILEIO: Using size: %llu bytes from struct" 164 " block_device blocks: %llu logical_block_size: %d\n", 165 dev_size, div_u64(dev_size, fd_dev->fd_block_size), 166 fd_dev->fd_block_size); 167 /* 168 * Check if the underlying struct block_device request_queue supports 169 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 170 * in ATA and we need to set TPE=1 171 */ 172 if (blk_queue_discard(q)) { 173 dev->dev_attrib.max_unmap_lba_count = 174 q->limits.max_discard_sectors; 175 /* 176 * Currently hardcoded to 1 in Linux/SCSI code.. 177 */ 178 dev->dev_attrib.max_unmap_block_desc_count = 1; 179 dev->dev_attrib.unmap_granularity = 180 q->limits.discard_granularity >> 9; 181 dev->dev_attrib.unmap_granularity_alignment = 182 q->limits.discard_alignment; 183 pr_debug("IFILE: BLOCK Discard support available," 184 " disabled by default\n"); 185 } 186 /* 187 * Enable write same emulation for IBLOCK and use 0xFFFF as 188 * the smaller WRITE_SAME(10) only has a two-byte block count. 189 */ 190 dev->dev_attrib.max_write_same_len = 0xFFFF; 191 192 if (blk_queue_nonrot(q)) 193 dev->dev_attrib.is_nonrot = 1; 194 } else { 195 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 196 pr_err("FILEIO: Missing fd_dev_size=" 197 " parameter, and no backing struct" 198 " block_device\n"); 199 goto fail; 200 } 201 202 fd_dev->fd_block_size = FD_BLOCKSIZE; 203 /* 204 * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 205 */ 206 dev->dev_attrib.max_unmap_lba_count = 0x2000; 207 /* 208 * Currently hardcoded to 1 in Linux/SCSI code.. 209 */ 210 dev->dev_attrib.max_unmap_block_desc_count = 1; 211 dev->dev_attrib.unmap_granularity = 1; 212 dev->dev_attrib.unmap_granularity_alignment = 0; 213 214 /* 215 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 216 * based upon struct iovec limit for vfs_writev() 217 */ 218 dev->dev_attrib.max_write_same_len = 0x1000; 219 } 220 221 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 222 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 223 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 224 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 225 226 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 227 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 228 " with FDBD_HAS_BUFFERED_IO_WCE\n"); 229 dev->dev_attrib.emulate_write_cache = 1; 230 } 231 232 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 233 fd_dev->fd_queue_depth = dev->queue_depth; 234 235 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 236 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 237 fd_dev->fd_dev_name, fd_dev->fd_dev_size); 238 239 return 0; 240 fail: 241 if (fd_dev->fd_file) { 242 filp_close(fd_dev->fd_file, NULL); 243 fd_dev->fd_file = NULL; 244 } 245 return ret; 246 } 247 248 static void fd_free_device(struct se_device *dev) 249 { 250 struct fd_dev *fd_dev = FD_DEV(dev); 251 252 if (fd_dev->fd_file) { 253 filp_close(fd_dev->fd_file, NULL); 254 fd_dev->fd_file = NULL; 255 } 256 257 kfree(fd_dev); 258 } 259 260 static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 261 u32 sgl_nents, int is_write) 262 { 263 struct se_device *se_dev = cmd->se_dev; 264 struct fd_dev *dev = FD_DEV(se_dev); 265 struct file *fd = dev->fd_file; 266 struct scatterlist *sg; 267 struct iovec *iov; 268 mm_segment_t old_fs; 269 loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 270 int ret = 0, i; 271 272 iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 273 if (!iov) { 274 pr_err("Unable to allocate fd_do_readv iov[]\n"); 275 return -ENOMEM; 276 } 277 278 for_each_sg(sgl, sg, sgl_nents, i) { 279 iov[i].iov_len = sg->length; 280 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; 281 } 282 283 old_fs = get_fs(); 284 set_fs(get_ds()); 285 286 if (is_write) 287 ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 288 else 289 ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 290 291 set_fs(old_fs); 292 293 for_each_sg(sgl, sg, sgl_nents, i) 294 kunmap(sg_page(sg)); 295 296 kfree(iov); 297 298 if (is_write) { 299 if (ret < 0 || ret != cmd->data_length) { 300 pr_err("%s() write returned %d\n", __func__, ret); 301 return (ret < 0 ? ret : -EINVAL); 302 } 303 } else { 304 /* 305 * Return zeros and GOOD status even if the READ did not return 306 * the expected virt_size for struct file w/o a backing struct 307 * block_device. 308 */ 309 if (S_ISBLK(file_inode(fd)->i_mode)) { 310 if (ret < 0 || ret != cmd->data_length) { 311 pr_err("%s() returned %d, expecting %u for " 312 "S_ISBLK\n", __func__, ret, 313 cmd->data_length); 314 return (ret < 0 ? ret : -EINVAL); 315 } 316 } else { 317 if (ret < 0) { 318 pr_err("%s() returned %d for non S_ISBLK\n", 319 __func__, ret); 320 return ret; 321 } 322 } 323 } 324 return 1; 325 } 326 327 static sense_reason_t 328 fd_execute_sync_cache(struct se_cmd *cmd) 329 { 330 struct se_device *dev = cmd->se_dev; 331 struct fd_dev *fd_dev = FD_DEV(dev); 332 int immed = (cmd->t_task_cdb[1] & 0x2); 333 loff_t start, end; 334 int ret; 335 336 /* 337 * If the Immediate bit is set, queue up the GOOD response 338 * for this SYNCHRONIZE_CACHE op 339 */ 340 if (immed) 341 target_complete_cmd(cmd, SAM_STAT_GOOD); 342 343 /* 344 * Determine if we will be flushing the entire device. 345 */ 346 if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 347 start = 0; 348 end = LLONG_MAX; 349 } else { 350 start = cmd->t_task_lba * dev->dev_attrib.block_size; 351 if (cmd->data_length) 352 end = start + cmd->data_length; 353 else 354 end = LLONG_MAX; 355 } 356 357 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 358 if (ret != 0) 359 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 360 361 if (immed) 362 return 0; 363 364 if (ret) 365 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 366 else 367 target_complete_cmd(cmd, SAM_STAT_GOOD); 368 369 return 0; 370 } 371 372 static unsigned char * 373 fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, 374 unsigned int len) 375 { 376 struct se_device *se_dev = cmd->se_dev; 377 unsigned int block_size = se_dev->dev_attrib.block_size; 378 unsigned int i = 0, end; 379 unsigned char *buf, *p, *kmap_buf; 380 381 buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); 382 if (!buf) { 383 pr_err("Unable to allocate fd_execute_write_same buf\n"); 384 return NULL; 385 } 386 387 kmap_buf = kmap(sg_page(sg)) + sg->offset; 388 if (!kmap_buf) { 389 pr_err("kmap() failed in fd_setup_write_same\n"); 390 kfree(buf); 391 return NULL; 392 } 393 /* 394 * Fill local *buf to contain multiple WRITE_SAME blocks up to 395 * min(len, PAGE_SIZE) 396 */ 397 p = buf; 398 end = min_t(unsigned int, len, PAGE_SIZE); 399 400 while (i < end) { 401 memcpy(p, kmap_buf, block_size); 402 403 i += block_size; 404 p += block_size; 405 } 406 kunmap(sg_page(sg)); 407 408 return buf; 409 } 410 411 static sense_reason_t 412 fd_execute_write_same(struct se_cmd *cmd) 413 { 414 struct se_device *se_dev = cmd->se_dev; 415 struct fd_dev *fd_dev = FD_DEV(se_dev); 416 struct file *f = fd_dev->fd_file; 417 struct scatterlist *sg; 418 struct iovec *iov; 419 mm_segment_t old_fs; 420 sector_t nolb = sbc_get_write_same_sectors(cmd); 421 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 422 unsigned int len, len_tmp, iov_num; 423 int i, rc; 424 unsigned char *buf; 425 426 if (!nolb) { 427 target_complete_cmd(cmd, SAM_STAT_GOOD); 428 return 0; 429 } 430 sg = &cmd->t_data_sg[0]; 431 432 if (cmd->t_data_nents > 1 || 433 sg->length != cmd->se_dev->dev_attrib.block_size) { 434 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 435 " block_size: %u\n", cmd->t_data_nents, sg->length, 436 cmd->se_dev->dev_attrib.block_size); 437 return TCM_INVALID_CDB_FIELD; 438 } 439 440 len = len_tmp = nolb * se_dev->dev_attrib.block_size; 441 iov_num = DIV_ROUND_UP(len, PAGE_SIZE); 442 443 buf = fd_setup_write_same_buf(cmd, sg, len); 444 if (!buf) 445 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 446 447 iov = vzalloc(sizeof(struct iovec) * iov_num); 448 if (!iov) { 449 pr_err("Unable to allocate fd_execute_write_same iovecs\n"); 450 kfree(buf); 451 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 452 } 453 /* 454 * Map the single fabric received scatterlist block now populated 455 * in *buf into each iovec for I/O submission. 456 */ 457 for (i = 0; i < iov_num; i++) { 458 iov[i].iov_base = buf; 459 iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); 460 len_tmp -= iov[i].iov_len; 461 } 462 463 old_fs = get_fs(); 464 set_fs(get_ds()); 465 rc = vfs_writev(f, &iov[0], iov_num, &pos); 466 set_fs(old_fs); 467 468 vfree(iov); 469 kfree(buf); 470 471 if (rc < 0 || rc != len) { 472 pr_err("vfs_writev() returned %d for write same\n", rc); 473 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 474 } 475 476 target_complete_cmd(cmd, SAM_STAT_GOOD); 477 return 0; 478 } 479 480 static sense_reason_t 481 fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 482 { 483 struct file *file = priv; 484 struct inode *inode = file->f_mapping->host; 485 int ret; 486 487 if (S_ISBLK(inode->i_mode)) { 488 /* The backend is block device, use discard */ 489 struct block_device *bdev = inode->i_bdev; 490 491 ret = blkdev_issue_discard(bdev, lba, 492 nolb, GFP_KERNEL, 0); 493 if (ret < 0) { 494 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 495 ret); 496 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 497 } 498 } else { 499 /* The backend is normal file, use fallocate */ 500 struct se_device *se_dev = cmd->se_dev; 501 loff_t pos = lba * se_dev->dev_attrib.block_size; 502 unsigned int len = nolb * se_dev->dev_attrib.block_size; 503 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 504 505 if (!file->f_op->fallocate) 506 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 507 508 ret = file->f_op->fallocate(file, mode, pos, len); 509 if (ret < 0) { 510 pr_warn("FILEIO: fallocate() failed: %d\n", ret); 511 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 512 } 513 } 514 515 return 0; 516 } 517 518 static sense_reason_t 519 fd_execute_write_same_unmap(struct se_cmd *cmd) 520 { 521 struct se_device *se_dev = cmd->se_dev; 522 struct fd_dev *fd_dev = FD_DEV(se_dev); 523 struct file *file = fd_dev->fd_file; 524 sector_t lba = cmd->t_task_lba; 525 sector_t nolb = sbc_get_write_same_sectors(cmd); 526 int ret; 527 528 if (!nolb) { 529 target_complete_cmd(cmd, SAM_STAT_GOOD); 530 return 0; 531 } 532 533 ret = fd_do_unmap(cmd, file, lba, nolb); 534 if (ret) 535 return ret; 536 537 target_complete_cmd(cmd, GOOD); 538 return 0; 539 } 540 541 static sense_reason_t 542 fd_execute_unmap(struct se_cmd *cmd) 543 { 544 struct file *file = FD_DEV(cmd->se_dev)->fd_file; 545 546 return sbc_execute_unmap(cmd, fd_do_unmap, file); 547 } 548 549 static sense_reason_t 550 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 551 enum dma_data_direction data_direction) 552 { 553 struct se_device *dev = cmd->se_dev; 554 int ret = 0; 555 556 /* 557 * Call vectorized fileio functions to map struct scatterlist 558 * physical memory addresses to struct iovec virtual memory. 559 */ 560 if (data_direction == DMA_FROM_DEVICE) { 561 ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 562 } else { 563 ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 564 /* 565 * Perform implicit vfs_fsync_range() for fd_do_writev() ops 566 * for SCSI WRITEs with Forced Unit Access (FUA) set. 567 * Allow this to happen independent of WCE=0 setting. 568 */ 569 if (ret > 0 && 570 dev->dev_attrib.emulate_fua_write > 0 && 571 (cmd->se_cmd_flags & SCF_FUA)) { 572 struct fd_dev *fd_dev = FD_DEV(dev); 573 loff_t start = cmd->t_task_lba * 574 dev->dev_attrib.block_size; 575 loff_t end = start + cmd->data_length; 576 577 vfs_fsync_range(fd_dev->fd_file, start, end, 1); 578 } 579 } 580 581 if (ret < 0) 582 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 583 584 if (ret) 585 target_complete_cmd(cmd, SAM_STAT_GOOD); 586 return 0; 587 } 588 589 enum { 590 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 591 }; 592 593 static match_table_t tokens = { 594 {Opt_fd_dev_name, "fd_dev_name=%s"}, 595 {Opt_fd_dev_size, "fd_dev_size=%s"}, 596 {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 597 {Opt_err, NULL} 598 }; 599 600 static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 601 const char *page, ssize_t count) 602 { 603 struct fd_dev *fd_dev = FD_DEV(dev); 604 char *orig, *ptr, *arg_p, *opts; 605 substring_t args[MAX_OPT_ARGS]; 606 int ret = 0, arg, token; 607 608 opts = kstrdup(page, GFP_KERNEL); 609 if (!opts) 610 return -ENOMEM; 611 612 orig = opts; 613 614 while ((ptr = strsep(&opts, ",\n")) != NULL) { 615 if (!*ptr) 616 continue; 617 618 token = match_token(ptr, tokens, args); 619 switch (token) { 620 case Opt_fd_dev_name: 621 if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 622 FD_MAX_DEV_NAME) == 0) { 623 ret = -EINVAL; 624 break; 625 } 626 pr_debug("FILEIO: Referencing Path: %s\n", 627 fd_dev->fd_dev_name); 628 fd_dev->fbd_flags |= FBDF_HAS_PATH; 629 break; 630 case Opt_fd_dev_size: 631 arg_p = match_strdup(&args[0]); 632 if (!arg_p) { 633 ret = -ENOMEM; 634 break; 635 } 636 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 637 kfree(arg_p); 638 if (ret < 0) { 639 pr_err("kstrtoull() failed for" 640 " fd_dev_size=\n"); 641 goto out; 642 } 643 pr_debug("FILEIO: Referencing Size: %llu" 644 " bytes\n", fd_dev->fd_dev_size); 645 fd_dev->fbd_flags |= FBDF_HAS_SIZE; 646 break; 647 case Opt_fd_buffered_io: 648 match_int(args, &arg); 649 if (arg != 1) { 650 pr_err("bogus fd_buffered_io=%d value\n", arg); 651 ret = -EINVAL; 652 goto out; 653 } 654 655 pr_debug("FILEIO: Using buffered I/O" 656 " operations for struct fd_dev\n"); 657 658 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 659 break; 660 default: 661 break; 662 } 663 } 664 665 out: 666 kfree(orig); 667 return (!ret) ? count : ret; 668 } 669 670 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 671 { 672 struct fd_dev *fd_dev = FD_DEV(dev); 673 ssize_t bl = 0; 674 675 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 676 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 677 fd_dev->fd_dev_name, fd_dev->fd_dev_size, 678 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 679 "Buffered-WCE" : "O_DSYNC"); 680 return bl; 681 } 682 683 static sector_t fd_get_blocks(struct se_device *dev) 684 { 685 struct fd_dev *fd_dev = FD_DEV(dev); 686 struct file *f = fd_dev->fd_file; 687 struct inode *i = f->f_mapping->host; 688 unsigned long long dev_size; 689 /* 690 * When using a file that references an underlying struct block_device, 691 * ensure dev_size is always based on the current inode size in order 692 * to handle underlying block_device resize operations. 693 */ 694 if (S_ISBLK(i->i_mode)) 695 dev_size = i_size_read(i); 696 else 697 dev_size = fd_dev->fd_dev_size; 698 699 return div_u64(dev_size - dev->dev_attrib.block_size, 700 dev->dev_attrib.block_size); 701 } 702 703 static struct sbc_ops fd_sbc_ops = { 704 .execute_rw = fd_execute_rw, 705 .execute_sync_cache = fd_execute_sync_cache, 706 .execute_write_same = fd_execute_write_same, 707 .execute_write_same_unmap = fd_execute_write_same_unmap, 708 .execute_unmap = fd_execute_unmap, 709 }; 710 711 static sense_reason_t 712 fd_parse_cdb(struct se_cmd *cmd) 713 { 714 return sbc_parse_cdb(cmd, &fd_sbc_ops); 715 } 716 717 static struct se_subsystem_api fileio_template = { 718 .name = "fileio", 719 .inquiry_prod = "FILEIO", 720 .inquiry_rev = FD_VERSION, 721 .owner = THIS_MODULE, 722 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 723 .attach_hba = fd_attach_hba, 724 .detach_hba = fd_detach_hba, 725 .alloc_device = fd_alloc_device, 726 .configure_device = fd_configure_device, 727 .free_device = fd_free_device, 728 .parse_cdb = fd_parse_cdb, 729 .set_configfs_dev_params = fd_set_configfs_dev_params, 730 .show_configfs_dev_params = fd_show_configfs_dev_params, 731 .get_device_type = sbc_get_device_type, 732 .get_blocks = fd_get_blocks, 733 }; 734 735 static int __init fileio_module_init(void) 736 { 737 return transport_subsystem_register(&fileio_template); 738 } 739 740 static void __exit fileio_module_exit(void) 741 { 742 transport_subsystem_release(&fileio_template); 743 } 744 745 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 746 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 747 MODULE_LICENSE("GPL"); 748 749 module_init(fileio_module_init); 750 module_exit(fileio_module_exit); 751