1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /******************************************************************************* 3 * Filename: target_core_file.c 4 * 5 * This file contains the Storage Engine <-> FILEIO transport specific functions 6 * 7 * (c) Copyright 2005-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 ******************************************************************************/ 12 13 #include <linux/string.h> 14 #include <linux/parser.h> 15 #include <linux/timer.h> 16 #include <linux/blkdev.h> 17 #include <linux/slab.h> 18 #include <linux/spinlock.h> 19 #include <linux/module.h> 20 #include <linux/vmalloc.h> 21 #include <linux/falloc.h> 22 #include <linux/uio.h> 23 #include <linux/scatterlist.h> 24 #include <scsi/scsi_proto.h> 25 #include <asm/unaligned.h> 26 27 #include <target/target_core_base.h> 28 #include <target/target_core_backend.h> 29 30 #include "target_core_file.h" 31 32 static inline struct fd_dev *FD_DEV(struct se_device *dev) 33 { 34 return container_of(dev, struct fd_dev, dev); 35 } 36 37 static int fd_attach_hba(struct se_hba *hba, u32 host_id) 38 { 39 struct fd_host *fd_host; 40 41 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 42 if (!fd_host) { 43 pr_err("Unable to allocate memory for struct fd_host\n"); 44 return -ENOMEM; 45 } 46 47 fd_host->fd_host_id = host_id; 48 49 hba->hba_ptr = fd_host; 50 51 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 52 " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 53 TARGET_CORE_VERSION); 54 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 55 hba->hba_id, fd_host->fd_host_id); 56 57 return 0; 58 } 59 60 static void fd_detach_hba(struct se_hba *hba) 61 { 62 struct fd_host *fd_host = hba->hba_ptr; 63 64 pr_debug("CORE_HBA[%d] - Detached FILEIO HBA: %u from Generic" 65 " Target Core\n", hba->hba_id, fd_host->fd_host_id); 66 67 kfree(fd_host); 68 hba->hba_ptr = NULL; 69 } 70 71 static struct se_device *fd_alloc_device(struct se_hba *hba, const char *name) 72 { 73 struct fd_dev *fd_dev; 74 struct fd_host *fd_host = hba->hba_ptr; 75 76 fd_dev = kzalloc(sizeof(struct fd_dev), GFP_KERNEL); 77 if (!fd_dev) { 78 pr_err("Unable to allocate memory for struct fd_dev\n"); 79 return NULL; 80 } 81 82 fd_dev->fd_host = fd_host; 83 84 pr_debug("FILEIO: Allocated fd_dev for %p\n", name); 85 86 return &fd_dev->dev; 87 } 88 89 static bool fd_configure_unmap(struct se_device *dev) 90 { 91 struct file *file = FD_DEV(dev)->fd_file; 92 struct inode *inode = file->f_mapping->host; 93 94 if (S_ISBLK(inode->i_mode)) 95 return target_configure_unmap_from_queue(&dev->dev_attrib, 96 I_BDEV(inode)); 97 98 /* Limit UNMAP emulation to 8k Number of LBAs (NoLB) */ 99 dev->dev_attrib.max_unmap_lba_count = 0x2000; 100 /* Currently hardcoded to 1 in Linux/SCSI code. */ 101 dev->dev_attrib.max_unmap_block_desc_count = 1; 102 dev->dev_attrib.unmap_granularity = 1; 103 dev->dev_attrib.unmap_granularity_alignment = 0; 104 return true; 105 } 106 107 static int fd_configure_device(struct se_device *dev) 108 { 109 struct fd_dev *fd_dev = FD_DEV(dev); 110 struct fd_host *fd_host = dev->se_hba->hba_ptr; 111 struct file *file; 112 struct inode *inode = NULL; 113 int flags, ret = -EINVAL; 114 115 if (!(fd_dev->fbd_flags & FBDF_HAS_PATH)) { 116 pr_err("Missing fd_dev_name=\n"); 117 return -EINVAL; 118 } 119 120 /* 121 * Use O_DSYNC by default instead of O_SYNC to forgo syncing 122 * of pure timestamp updates. 123 */ 124 flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 125 126 /* 127 * Optionally allow fd_buffered_io=1 to be enabled for people 128 * who want use the fs buffer cache as an WriteCache mechanism. 129 * 130 * This means that in event of a hard failure, there is a risk 131 * of silent data-loss if the SCSI client has *not* performed a 132 * forced unit access (FUA) write, or issued SYNCHRONIZE_CACHE 133 * to write-out the entire device cache. 134 */ 135 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 136 pr_debug("FILEIO: Disabling O_DSYNC, using buffered FILEIO\n"); 137 flags &= ~O_DSYNC; 138 } 139 140 file = filp_open(fd_dev->fd_dev_name, flags, 0600); 141 if (IS_ERR(file)) { 142 pr_err("filp_open(%s) failed\n", fd_dev->fd_dev_name); 143 ret = PTR_ERR(file); 144 goto fail; 145 } 146 fd_dev->fd_file = file; 147 /* 148 * If using a block backend with this struct file, we extract 149 * fd_dev->fd_[block,dev]_size from struct block_device. 150 * 151 * Otherwise, we use the passed fd_size= from configfs 152 */ 153 inode = file->f_mapping->host; 154 if (S_ISBLK(inode->i_mode)) { 155 struct block_device *bdev = I_BDEV(inode); 156 unsigned long long dev_size; 157 158 fd_dev->fd_block_size = bdev_logical_block_size(bdev); 159 /* 160 * Determine the number of bytes from i_size_read() minus 161 * one (1) logical sector from underlying struct block_device 162 */ 163 dev_size = (i_size_read(file->f_mapping->host) - 164 fd_dev->fd_block_size); 165 166 pr_debug("FILEIO: Using size: %llu bytes from struct" 167 " block_device blocks: %llu logical_block_size: %d\n", 168 dev_size, div_u64(dev_size, fd_dev->fd_block_size), 169 fd_dev->fd_block_size); 170 /* 171 * Enable write same emulation for IBLOCK and use 0xFFFF as 172 * the smaller WRITE_SAME(10) only has a two-byte block count. 173 */ 174 dev->dev_attrib.max_write_same_len = 0xFFFF; 175 176 if (bdev_nonrot(bdev)) 177 dev->dev_attrib.is_nonrot = 1; 178 } else { 179 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 180 pr_err("FILEIO: Missing fd_dev_size=" 181 " parameter, and no backing struct" 182 " block_device\n"); 183 goto fail; 184 } 185 186 fd_dev->fd_block_size = FD_BLOCKSIZE; 187 188 /* 189 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 190 * based upon struct iovec limit for vfs_writev() 191 */ 192 dev->dev_attrib.max_write_same_len = 0x1000; 193 } 194 195 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 196 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 197 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 198 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 199 200 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 201 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 202 " with FDBD_HAS_BUFFERED_IO_WCE\n"); 203 dev->dev_attrib.emulate_write_cache = 1; 204 } 205 206 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 207 fd_dev->fd_queue_depth = dev->queue_depth; 208 209 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 210 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 211 fd_dev->fd_dev_name, fd_dev->fd_dev_size); 212 213 return 0; 214 fail: 215 if (fd_dev->fd_file) { 216 filp_close(fd_dev->fd_file, NULL); 217 fd_dev->fd_file = NULL; 218 } 219 return ret; 220 } 221 222 static void fd_dev_call_rcu(struct rcu_head *p) 223 { 224 struct se_device *dev = container_of(p, struct se_device, rcu_head); 225 struct fd_dev *fd_dev = FD_DEV(dev); 226 227 kfree(fd_dev); 228 } 229 230 static void fd_free_device(struct se_device *dev) 231 { 232 call_rcu(&dev->rcu_head, fd_dev_call_rcu); 233 } 234 235 static void fd_destroy_device(struct se_device *dev) 236 { 237 struct fd_dev *fd_dev = FD_DEV(dev); 238 239 if (fd_dev->fd_file) { 240 filp_close(fd_dev->fd_file, NULL); 241 fd_dev->fd_file = NULL; 242 } 243 } 244 245 struct target_core_file_cmd { 246 unsigned long len; 247 struct se_cmd *cmd; 248 struct kiocb iocb; 249 struct bio_vec bvecs[]; 250 }; 251 252 static void cmd_rw_aio_complete(struct kiocb *iocb, long ret) 253 { 254 struct target_core_file_cmd *cmd; 255 256 cmd = container_of(iocb, struct target_core_file_cmd, iocb); 257 258 if (ret != cmd->len) 259 target_complete_cmd(cmd->cmd, SAM_STAT_CHECK_CONDITION); 260 else 261 target_complete_cmd(cmd->cmd, SAM_STAT_GOOD); 262 263 kfree(cmd); 264 } 265 266 static sense_reason_t 267 fd_execute_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 268 enum dma_data_direction data_direction) 269 { 270 int is_write = !(data_direction == DMA_FROM_DEVICE); 271 struct se_device *dev = cmd->se_dev; 272 struct fd_dev *fd_dev = FD_DEV(dev); 273 struct file *file = fd_dev->fd_file; 274 struct target_core_file_cmd *aio_cmd; 275 struct iov_iter iter; 276 struct scatterlist *sg; 277 ssize_t len = 0; 278 int ret = 0, i; 279 280 aio_cmd = kmalloc(struct_size(aio_cmd, bvecs, sgl_nents), GFP_KERNEL); 281 if (!aio_cmd) 282 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 283 284 for_each_sg(sgl, sg, sgl_nents, i) { 285 aio_cmd->bvecs[i].bv_page = sg_page(sg); 286 aio_cmd->bvecs[i].bv_len = sg->length; 287 aio_cmd->bvecs[i].bv_offset = sg->offset; 288 289 len += sg->length; 290 } 291 292 iov_iter_bvec(&iter, is_write, aio_cmd->bvecs, sgl_nents, len); 293 294 aio_cmd->cmd = cmd; 295 aio_cmd->len = len; 296 aio_cmd->iocb.ki_pos = cmd->t_task_lba * dev->dev_attrib.block_size; 297 aio_cmd->iocb.ki_filp = file; 298 aio_cmd->iocb.ki_complete = cmd_rw_aio_complete; 299 aio_cmd->iocb.ki_flags = IOCB_DIRECT; 300 301 if (is_write && (cmd->se_cmd_flags & SCF_FUA)) 302 aio_cmd->iocb.ki_flags |= IOCB_DSYNC; 303 304 if (is_write) 305 ret = call_write_iter(file, &aio_cmd->iocb, &iter); 306 else 307 ret = call_read_iter(file, &aio_cmd->iocb, &iter); 308 309 if (ret != -EIOCBQUEUED) 310 cmd_rw_aio_complete(&aio_cmd->iocb, ret); 311 312 return 0; 313 } 314 315 static int fd_do_rw(struct se_cmd *cmd, struct file *fd, 316 u32 block_size, struct scatterlist *sgl, 317 u32 sgl_nents, u32 data_length, int is_write) 318 { 319 struct scatterlist *sg; 320 struct iov_iter iter; 321 struct bio_vec *bvec; 322 ssize_t len = 0; 323 loff_t pos = (cmd->t_task_lba * block_size); 324 int ret = 0, i; 325 326 bvec = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_KERNEL); 327 if (!bvec) { 328 pr_err("Unable to allocate fd_do_readv iov[]\n"); 329 return -ENOMEM; 330 } 331 332 for_each_sg(sgl, sg, sgl_nents, i) { 333 bvec[i].bv_page = sg_page(sg); 334 bvec[i].bv_len = sg->length; 335 bvec[i].bv_offset = sg->offset; 336 337 len += sg->length; 338 } 339 340 iov_iter_bvec(&iter, READ, bvec, sgl_nents, len); 341 if (is_write) 342 ret = vfs_iter_write(fd, &iter, &pos, 0); 343 else 344 ret = vfs_iter_read(fd, &iter, &pos, 0); 345 346 if (is_write) { 347 if (ret < 0 || ret != data_length) { 348 pr_err("%s() write returned %d\n", __func__, ret); 349 if (ret >= 0) 350 ret = -EINVAL; 351 } 352 } else { 353 /* 354 * Return zeros and GOOD status even if the READ did not return 355 * the expected virt_size for struct file w/o a backing struct 356 * block_device. 357 */ 358 if (S_ISBLK(file_inode(fd)->i_mode)) { 359 if (ret < 0 || ret != data_length) { 360 pr_err("%s() returned %d, expecting %u for " 361 "S_ISBLK\n", __func__, ret, 362 data_length); 363 if (ret >= 0) 364 ret = -EINVAL; 365 } 366 } else { 367 if (ret < 0) { 368 pr_err("%s() returned %d for non S_ISBLK\n", 369 __func__, ret); 370 } else if (ret != data_length) { 371 /* 372 * Short read case: 373 * Probably some one truncate file under us. 374 * We must explicitly zero sg-pages to prevent 375 * expose uninizialized pages to userspace. 376 */ 377 if (ret < data_length) 378 ret += iov_iter_zero(data_length - ret, &iter); 379 else 380 ret = -EINVAL; 381 } 382 } 383 } 384 kfree(bvec); 385 return ret; 386 } 387 388 static sense_reason_t 389 fd_execute_sync_cache(struct se_cmd *cmd) 390 { 391 struct se_device *dev = cmd->se_dev; 392 struct fd_dev *fd_dev = FD_DEV(dev); 393 int immed = (cmd->t_task_cdb[1] & 0x2); 394 loff_t start, end; 395 int ret; 396 397 /* 398 * If the Immediate bit is set, queue up the GOOD response 399 * for this SYNCHRONIZE_CACHE op 400 */ 401 if (immed) 402 target_complete_cmd(cmd, SAM_STAT_GOOD); 403 404 /* 405 * Determine if we will be flushing the entire device. 406 */ 407 if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 408 start = 0; 409 end = LLONG_MAX; 410 } else { 411 start = cmd->t_task_lba * dev->dev_attrib.block_size; 412 if (cmd->data_length) 413 end = start + cmd->data_length - 1; 414 else 415 end = LLONG_MAX; 416 } 417 418 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 419 if (ret != 0) 420 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 421 422 if (immed) 423 return 0; 424 425 if (ret) 426 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 427 else 428 target_complete_cmd(cmd, SAM_STAT_GOOD); 429 430 return 0; 431 } 432 433 static sense_reason_t 434 fd_execute_write_same(struct se_cmd *cmd) 435 { 436 struct se_device *se_dev = cmd->se_dev; 437 struct fd_dev *fd_dev = FD_DEV(se_dev); 438 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 439 sector_t nolb = sbc_get_write_same_sectors(cmd); 440 struct iov_iter iter; 441 struct bio_vec *bvec; 442 unsigned int len = 0, i; 443 ssize_t ret; 444 445 if (cmd->prot_op) { 446 pr_err("WRITE_SAME: Protection information with FILEIO" 447 " backends not supported\n"); 448 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 449 } 450 451 if (!cmd->t_data_nents) 452 return TCM_INVALID_CDB_FIELD; 453 454 if (cmd->t_data_nents > 1 || 455 cmd->t_data_sg[0].length != cmd->se_dev->dev_attrib.block_size) { 456 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 457 " block_size: %u\n", 458 cmd->t_data_nents, 459 cmd->t_data_sg[0].length, 460 cmd->se_dev->dev_attrib.block_size); 461 return TCM_INVALID_CDB_FIELD; 462 } 463 464 bvec = kcalloc(nolb, sizeof(struct bio_vec), GFP_KERNEL); 465 if (!bvec) 466 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 467 468 for (i = 0; i < nolb; i++) { 469 bvec[i].bv_page = sg_page(&cmd->t_data_sg[0]); 470 bvec[i].bv_len = cmd->t_data_sg[0].length; 471 bvec[i].bv_offset = cmd->t_data_sg[0].offset; 472 473 len += se_dev->dev_attrib.block_size; 474 } 475 476 iov_iter_bvec(&iter, READ, bvec, nolb, len); 477 ret = vfs_iter_write(fd_dev->fd_file, &iter, &pos, 0); 478 479 kfree(bvec); 480 if (ret < 0 || ret != len) { 481 pr_err("vfs_iter_write() returned %zd for write same\n", ret); 482 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 483 } 484 485 target_complete_cmd(cmd, SAM_STAT_GOOD); 486 return 0; 487 } 488 489 static int 490 fd_do_prot_fill(struct se_device *se_dev, sector_t lba, sector_t nolb, 491 void *buf, size_t bufsize) 492 { 493 struct fd_dev *fd_dev = FD_DEV(se_dev); 494 struct file *prot_fd = fd_dev->fd_prot_file; 495 sector_t prot_length, prot; 496 loff_t pos = lba * se_dev->prot_length; 497 498 if (!prot_fd) { 499 pr_err("Unable to locate fd_dev->fd_prot_file\n"); 500 return -ENODEV; 501 } 502 503 prot_length = nolb * se_dev->prot_length; 504 505 memset(buf, 0xff, bufsize); 506 for (prot = 0; prot < prot_length;) { 507 sector_t len = min_t(sector_t, bufsize, prot_length - prot); 508 ssize_t ret = kernel_write(prot_fd, buf, len, &pos); 509 510 if (ret != len) { 511 pr_err("vfs_write to prot file failed: %zd\n", ret); 512 return ret < 0 ? ret : -ENODEV; 513 } 514 prot += ret; 515 } 516 517 return 0; 518 } 519 520 static int 521 fd_do_prot_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 522 { 523 void *buf; 524 int rc; 525 526 buf = (void *)__get_free_page(GFP_KERNEL); 527 if (!buf) { 528 pr_err("Unable to allocate FILEIO prot buf\n"); 529 return -ENOMEM; 530 } 531 532 rc = fd_do_prot_fill(cmd->se_dev, lba, nolb, buf, PAGE_SIZE); 533 534 free_page((unsigned long)buf); 535 536 return rc; 537 } 538 539 static sense_reason_t 540 fd_execute_unmap(struct se_cmd *cmd, sector_t lba, sector_t nolb) 541 { 542 struct file *file = FD_DEV(cmd->se_dev)->fd_file; 543 struct inode *inode = file->f_mapping->host; 544 int ret; 545 546 if (!nolb) { 547 return 0; 548 } 549 550 if (cmd->se_dev->dev_attrib.pi_prot_type) { 551 ret = fd_do_prot_unmap(cmd, lba, nolb); 552 if (ret) 553 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 554 } 555 556 if (S_ISBLK(inode->i_mode)) { 557 /* The backend is block device, use discard */ 558 struct block_device *bdev = I_BDEV(inode); 559 struct se_device *dev = cmd->se_dev; 560 561 ret = blkdev_issue_discard(bdev, 562 target_to_linux_sector(dev, lba), 563 target_to_linux_sector(dev, nolb), 564 GFP_KERNEL); 565 if (ret < 0) { 566 pr_warn("FILEIO: blkdev_issue_discard() failed: %d\n", 567 ret); 568 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 569 } 570 } else { 571 /* The backend is normal file, use fallocate */ 572 struct se_device *se_dev = cmd->se_dev; 573 loff_t pos = lba * se_dev->dev_attrib.block_size; 574 unsigned int len = nolb * se_dev->dev_attrib.block_size; 575 int mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE; 576 577 if (!file->f_op->fallocate) 578 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 579 580 ret = file->f_op->fallocate(file, mode, pos, len); 581 if (ret < 0) { 582 pr_warn("FILEIO: fallocate() failed: %d\n", ret); 583 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 584 } 585 } 586 587 return 0; 588 } 589 590 static sense_reason_t 591 fd_execute_rw_buffered(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 592 enum dma_data_direction data_direction) 593 { 594 struct se_device *dev = cmd->se_dev; 595 struct fd_dev *fd_dev = FD_DEV(dev); 596 struct file *file = fd_dev->fd_file; 597 struct file *pfile = fd_dev->fd_prot_file; 598 sense_reason_t rc; 599 int ret = 0; 600 /* 601 * Call vectorized fileio functions to map struct scatterlist 602 * physical memory addresses to struct iovec virtual memory. 603 */ 604 if (data_direction == DMA_FROM_DEVICE) { 605 if (cmd->prot_type && dev->dev_attrib.pi_prot_type) { 606 ret = fd_do_rw(cmd, pfile, dev->prot_length, 607 cmd->t_prot_sg, cmd->t_prot_nents, 608 cmd->prot_length, 0); 609 if (ret < 0) 610 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 611 } 612 613 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 614 sgl, sgl_nents, cmd->data_length, 0); 615 616 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type && 617 dev->dev_attrib.pi_prot_verify) { 618 u32 sectors = cmd->data_length >> 619 ilog2(dev->dev_attrib.block_size); 620 621 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 622 0, cmd->t_prot_sg, 0); 623 if (rc) 624 return rc; 625 } 626 } else { 627 if (cmd->prot_type && dev->dev_attrib.pi_prot_type && 628 dev->dev_attrib.pi_prot_verify) { 629 u32 sectors = cmd->data_length >> 630 ilog2(dev->dev_attrib.block_size); 631 632 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 633 0, cmd->t_prot_sg, 0); 634 if (rc) 635 return rc; 636 } 637 638 ret = fd_do_rw(cmd, file, dev->dev_attrib.block_size, 639 sgl, sgl_nents, cmd->data_length, 1); 640 /* 641 * Perform implicit vfs_fsync_range() for fd_do_writev() ops 642 * for SCSI WRITEs with Forced Unit Access (FUA) set. 643 * Allow this to happen independent of WCE=0 setting. 644 */ 645 if (ret > 0 && (cmd->se_cmd_flags & SCF_FUA)) { 646 loff_t start = cmd->t_task_lba * 647 dev->dev_attrib.block_size; 648 loff_t end; 649 650 if (cmd->data_length) 651 end = start + cmd->data_length - 1; 652 else 653 end = LLONG_MAX; 654 655 vfs_fsync_range(fd_dev->fd_file, start, end, 1); 656 } 657 658 if (ret > 0 && cmd->prot_type && dev->dev_attrib.pi_prot_type) { 659 ret = fd_do_rw(cmd, pfile, dev->prot_length, 660 cmd->t_prot_sg, cmd->t_prot_nents, 661 cmd->prot_length, 1); 662 if (ret < 0) 663 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 664 } 665 } 666 667 if (ret < 0) 668 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 669 670 target_complete_cmd(cmd, SAM_STAT_GOOD); 671 return 0; 672 } 673 674 static sense_reason_t 675 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 676 enum dma_data_direction data_direction) 677 { 678 struct se_device *dev = cmd->se_dev; 679 struct fd_dev *fd_dev = FD_DEV(dev); 680 681 /* 682 * We are currently limited by the number of iovecs (2048) per 683 * single vfs_[writev,readv] call. 684 */ 685 if (cmd->data_length > FD_MAX_BYTES) { 686 pr_err("FILEIO: Not able to process I/O of %u bytes due to" 687 "FD_MAX_BYTES: %u iovec count limitation\n", 688 cmd->data_length, FD_MAX_BYTES); 689 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 690 } 691 692 if (fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO) 693 return fd_execute_rw_aio(cmd, sgl, sgl_nents, data_direction); 694 return fd_execute_rw_buffered(cmd, sgl, sgl_nents, data_direction); 695 } 696 697 enum { 698 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, 699 Opt_fd_async_io, Opt_err 700 }; 701 702 static match_table_t tokens = { 703 {Opt_fd_dev_name, "fd_dev_name=%s"}, 704 {Opt_fd_dev_size, "fd_dev_size=%s"}, 705 {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 706 {Opt_fd_async_io, "fd_async_io=%d"}, 707 {Opt_err, NULL} 708 }; 709 710 static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 711 const char *page, ssize_t count) 712 { 713 struct fd_dev *fd_dev = FD_DEV(dev); 714 char *orig, *ptr, *arg_p, *opts; 715 substring_t args[MAX_OPT_ARGS]; 716 int ret = 0, arg, token; 717 718 opts = kstrdup(page, GFP_KERNEL); 719 if (!opts) 720 return -ENOMEM; 721 722 orig = opts; 723 724 while ((ptr = strsep(&opts, ",\n")) != NULL) { 725 if (!*ptr) 726 continue; 727 728 token = match_token(ptr, tokens, args); 729 switch (token) { 730 case Opt_fd_dev_name: 731 if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 732 FD_MAX_DEV_NAME) == 0) { 733 ret = -EINVAL; 734 break; 735 } 736 pr_debug("FILEIO: Referencing Path: %s\n", 737 fd_dev->fd_dev_name); 738 fd_dev->fbd_flags |= FBDF_HAS_PATH; 739 break; 740 case Opt_fd_dev_size: 741 arg_p = match_strdup(&args[0]); 742 if (!arg_p) { 743 ret = -ENOMEM; 744 break; 745 } 746 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 747 kfree(arg_p); 748 if (ret < 0) { 749 pr_err("kstrtoull() failed for" 750 " fd_dev_size=\n"); 751 goto out; 752 } 753 pr_debug("FILEIO: Referencing Size: %llu" 754 " bytes\n", fd_dev->fd_dev_size); 755 fd_dev->fbd_flags |= FBDF_HAS_SIZE; 756 break; 757 case Opt_fd_buffered_io: 758 ret = match_int(args, &arg); 759 if (ret) 760 goto out; 761 if (arg != 1) { 762 pr_err("bogus fd_buffered_io=%d value\n", arg); 763 ret = -EINVAL; 764 goto out; 765 } 766 767 pr_debug("FILEIO: Using buffered I/O" 768 " operations for struct fd_dev\n"); 769 770 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 771 break; 772 case Opt_fd_async_io: 773 ret = match_int(args, &arg); 774 if (ret) 775 goto out; 776 if (arg != 1) { 777 pr_err("bogus fd_async_io=%d value\n", arg); 778 ret = -EINVAL; 779 goto out; 780 } 781 782 pr_debug("FILEIO: Using async I/O" 783 " operations for struct fd_dev\n"); 784 785 fd_dev->fbd_flags |= FDBD_HAS_ASYNC_IO; 786 break; 787 default: 788 break; 789 } 790 } 791 792 out: 793 kfree(orig); 794 return (!ret) ? count : ret; 795 } 796 797 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 798 { 799 struct fd_dev *fd_dev = FD_DEV(dev); 800 ssize_t bl = 0; 801 802 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 803 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s Async: %d\n", 804 fd_dev->fd_dev_name, fd_dev->fd_dev_size, 805 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 806 "Buffered-WCE" : "O_DSYNC", 807 !!(fd_dev->fbd_flags & FDBD_HAS_ASYNC_IO)); 808 return bl; 809 } 810 811 static sector_t fd_get_blocks(struct se_device *dev) 812 { 813 struct fd_dev *fd_dev = FD_DEV(dev); 814 struct file *f = fd_dev->fd_file; 815 struct inode *i = f->f_mapping->host; 816 unsigned long long dev_size; 817 /* 818 * When using a file that references an underlying struct block_device, 819 * ensure dev_size is always based on the current inode size in order 820 * to handle underlying block_device resize operations. 821 */ 822 if (S_ISBLK(i->i_mode)) 823 dev_size = i_size_read(i); 824 else 825 dev_size = fd_dev->fd_dev_size; 826 827 return div_u64(dev_size - dev->dev_attrib.block_size, 828 dev->dev_attrib.block_size); 829 } 830 831 static int fd_init_prot(struct se_device *dev) 832 { 833 struct fd_dev *fd_dev = FD_DEV(dev); 834 struct file *prot_file, *file = fd_dev->fd_file; 835 struct inode *inode; 836 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 837 char buf[FD_MAX_DEV_PROT_NAME]; 838 839 if (!file) { 840 pr_err("Unable to locate fd_dev->fd_file\n"); 841 return -ENODEV; 842 } 843 844 inode = file->f_mapping->host; 845 if (S_ISBLK(inode->i_mode)) { 846 pr_err("FILEIO Protection emulation only supported on" 847 " !S_ISBLK\n"); 848 return -ENOSYS; 849 } 850 851 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 852 flags &= ~O_DSYNC; 853 854 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 855 fd_dev->fd_dev_name); 856 857 prot_file = filp_open(buf, flags, 0600); 858 if (IS_ERR(prot_file)) { 859 pr_err("filp_open(%s) failed\n", buf); 860 ret = PTR_ERR(prot_file); 861 return ret; 862 } 863 fd_dev->fd_prot_file = prot_file; 864 865 return 0; 866 } 867 868 static int fd_format_prot(struct se_device *dev) 869 { 870 unsigned char *buf; 871 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 872 int ret; 873 874 if (!dev->dev_attrib.pi_prot_type) { 875 pr_err("Unable to format_prot while pi_prot_type == 0\n"); 876 return -ENODEV; 877 } 878 879 buf = vzalloc(unit_size); 880 if (!buf) { 881 pr_err("Unable to allocate FILEIO prot buf\n"); 882 return -ENOMEM; 883 } 884 885 pr_debug("Using FILEIO prot_length: %llu\n", 886 (unsigned long long)(dev->transport->get_blocks(dev) + 1) * 887 dev->prot_length); 888 889 ret = fd_do_prot_fill(dev, 0, dev->transport->get_blocks(dev) + 1, 890 buf, unit_size); 891 vfree(buf); 892 return ret; 893 } 894 895 static void fd_free_prot(struct se_device *dev) 896 { 897 struct fd_dev *fd_dev = FD_DEV(dev); 898 899 if (!fd_dev->fd_prot_file) 900 return; 901 902 filp_close(fd_dev->fd_prot_file, NULL); 903 fd_dev->fd_prot_file = NULL; 904 } 905 906 static struct sbc_ops fd_sbc_ops = { 907 .execute_rw = fd_execute_rw, 908 .execute_sync_cache = fd_execute_sync_cache, 909 .execute_write_same = fd_execute_write_same, 910 .execute_unmap = fd_execute_unmap, 911 }; 912 913 static sense_reason_t 914 fd_parse_cdb(struct se_cmd *cmd) 915 { 916 return sbc_parse_cdb(cmd, &fd_sbc_ops); 917 } 918 919 static const struct target_backend_ops fileio_ops = { 920 .name = "fileio", 921 .inquiry_prod = "FILEIO", 922 .inquiry_rev = FD_VERSION, 923 .owner = THIS_MODULE, 924 .attach_hba = fd_attach_hba, 925 .detach_hba = fd_detach_hba, 926 .alloc_device = fd_alloc_device, 927 .configure_device = fd_configure_device, 928 .destroy_device = fd_destroy_device, 929 .free_device = fd_free_device, 930 .configure_unmap = fd_configure_unmap, 931 .parse_cdb = fd_parse_cdb, 932 .set_configfs_dev_params = fd_set_configfs_dev_params, 933 .show_configfs_dev_params = fd_show_configfs_dev_params, 934 .get_device_type = sbc_get_device_type, 935 .get_blocks = fd_get_blocks, 936 .init_prot = fd_init_prot, 937 .format_prot = fd_format_prot, 938 .free_prot = fd_free_prot, 939 .tb_dev_attrib_attrs = sbc_attrib_attrs, 940 }; 941 942 static int __init fileio_module_init(void) 943 { 944 return transport_backend_register(&fileio_ops); 945 } 946 947 static void __exit fileio_module_exit(void) 948 { 949 target_backend_unregister(&fileio_ops); 950 } 951 952 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 953 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 954 MODULE_LICENSE("GPL"); 955 956 module_init(fileio_module_init); 957 module_exit(fileio_module_exit); 958