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 #include <target/target_core_backend_configfs.h> 41 42 #include "target_core_file.h" 43 44 static inline struct fd_dev *FD_DEV(struct se_device *dev) 45 { 46 return container_of(dev, struct fd_dev, dev); 47 } 48 49 /* fd_attach_hba(): (Part of se_subsystem_api_t template) 50 * 51 * 52 */ 53 static int fd_attach_hba(struct se_hba *hba, u32 host_id) 54 { 55 struct fd_host *fd_host; 56 57 fd_host = kzalloc(sizeof(struct fd_host), GFP_KERNEL); 58 if (!fd_host) { 59 pr_err("Unable to allocate memory for struct fd_host\n"); 60 return -ENOMEM; 61 } 62 63 fd_host->fd_host_id = host_id; 64 65 hba->hba_ptr = fd_host; 66 67 pr_debug("CORE_HBA[%d] - TCM FILEIO HBA Driver %s on Generic" 68 " Target Core Stack %s\n", hba->hba_id, FD_VERSION, 69 TARGET_CORE_MOD_VERSION); 70 pr_debug("CORE_HBA[%d] - Attached FILEIO HBA: %u to Generic\n", 71 hba->hba_id, fd_host->fd_host_id); 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 fd_dev->fd_block_size = bdev_logical_block_size(inode->i_bdev); 157 /* 158 * Determine the number of bytes from i_size_read() minus 159 * one (1) logical sector from underlying struct block_device 160 */ 161 dev_size = (i_size_read(file->f_mapping->host) - 162 fd_dev->fd_block_size); 163 164 pr_debug("FILEIO: Using size: %llu bytes from struct" 165 " block_device blocks: %llu logical_block_size: %d\n", 166 dev_size, div_u64(dev_size, fd_dev->fd_block_size), 167 fd_dev->fd_block_size); 168 /* 169 * Check if the underlying struct block_device request_queue supports 170 * the QUEUE_FLAG_DISCARD bit for UNMAP/WRITE_SAME in SCSI + TRIM 171 * in ATA and we need to set TPE=1 172 */ 173 if (blk_queue_discard(q)) { 174 dev->dev_attrib.max_unmap_lba_count = 175 q->limits.max_discard_sectors; 176 /* 177 * Currently hardcoded to 1 in Linux/SCSI code.. 178 */ 179 dev->dev_attrib.max_unmap_block_desc_count = 1; 180 dev->dev_attrib.unmap_granularity = 181 q->limits.discard_granularity >> 9; 182 dev->dev_attrib.unmap_granularity_alignment = 183 q->limits.discard_alignment; 184 pr_debug("IFILE: BLOCK Discard support available," 185 " disabled by default\n"); 186 } 187 /* 188 * Enable write same emulation for IBLOCK and use 0xFFFF as 189 * the smaller WRITE_SAME(10) only has a two-byte block count. 190 */ 191 dev->dev_attrib.max_write_same_len = 0xFFFF; 192 193 if (blk_queue_nonrot(q)) 194 dev->dev_attrib.is_nonrot = 1; 195 } else { 196 if (!(fd_dev->fbd_flags & FBDF_HAS_SIZE)) { 197 pr_err("FILEIO: Missing fd_dev_size=" 198 " parameter, and no backing struct" 199 " block_device\n"); 200 goto fail; 201 } 202 203 fd_dev->fd_block_size = FD_BLOCKSIZE; 204 /* 205 * Limit UNMAP emulation to 8k Number of LBAs (NoLB) 206 */ 207 dev->dev_attrib.max_unmap_lba_count = 0x2000; 208 /* 209 * Currently hardcoded to 1 in Linux/SCSI code.. 210 */ 211 dev->dev_attrib.max_unmap_block_desc_count = 1; 212 dev->dev_attrib.unmap_granularity = 1; 213 dev->dev_attrib.unmap_granularity_alignment = 0; 214 215 /* 216 * Limit WRITE_SAME w/ UNMAP=0 emulation to 8k Number of LBAs (NoLB) 217 * based upon struct iovec limit for vfs_writev() 218 */ 219 dev->dev_attrib.max_write_same_len = 0x1000; 220 } 221 222 dev->dev_attrib.hw_block_size = fd_dev->fd_block_size; 223 dev->dev_attrib.max_bytes_per_io = FD_MAX_BYTES; 224 dev->dev_attrib.hw_max_sectors = FD_MAX_BYTES / fd_dev->fd_block_size; 225 dev->dev_attrib.hw_queue_depth = FD_MAX_DEVICE_QUEUE_DEPTH; 226 227 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) { 228 pr_debug("FILEIO: Forcing setting of emulate_write_cache=1" 229 " with FDBD_HAS_BUFFERED_IO_WCE\n"); 230 dev->dev_attrib.emulate_write_cache = 1; 231 } 232 233 fd_dev->fd_dev_id = fd_host->fd_host_dev_id_count++; 234 fd_dev->fd_queue_depth = dev->queue_depth; 235 236 pr_debug("CORE_FILE[%u] - Added TCM FILEIO Device ID: %u at %s," 237 " %llu total bytes\n", fd_host->fd_host_id, fd_dev->fd_dev_id, 238 fd_dev->fd_dev_name, fd_dev->fd_dev_size); 239 240 return 0; 241 fail: 242 if (fd_dev->fd_file) { 243 filp_close(fd_dev->fd_file, NULL); 244 fd_dev->fd_file = NULL; 245 } 246 return ret; 247 } 248 249 static void fd_free_device(struct se_device *dev) 250 { 251 struct fd_dev *fd_dev = FD_DEV(dev); 252 253 if (fd_dev->fd_file) { 254 filp_close(fd_dev->fd_file, NULL); 255 fd_dev->fd_file = NULL; 256 } 257 258 kfree(fd_dev); 259 } 260 261 static int fd_do_prot_rw(struct se_cmd *cmd, struct fd_prot *fd_prot, 262 int is_write) 263 { 264 struct se_device *se_dev = cmd->se_dev; 265 struct fd_dev *dev = FD_DEV(se_dev); 266 struct file *prot_fd = dev->fd_prot_file; 267 struct scatterlist *sg; 268 loff_t pos = (cmd->t_task_lba * se_dev->prot_length); 269 unsigned char *buf; 270 u32 prot_size, len, size; 271 int rc, ret = 1, i; 272 273 prot_size = (cmd->data_length / se_dev->dev_attrib.block_size) * 274 se_dev->prot_length; 275 276 if (!is_write) { 277 fd_prot->prot_buf = vzalloc(prot_size); 278 if (!fd_prot->prot_buf) { 279 pr_err("Unable to allocate fd_prot->prot_buf\n"); 280 return -ENOMEM; 281 } 282 buf = fd_prot->prot_buf; 283 284 fd_prot->prot_sg_nents = cmd->t_prot_nents; 285 fd_prot->prot_sg = kzalloc(sizeof(struct scatterlist) * 286 fd_prot->prot_sg_nents, GFP_KERNEL); 287 if (!fd_prot->prot_sg) { 288 pr_err("Unable to allocate fd_prot->prot_sg\n"); 289 vfree(fd_prot->prot_buf); 290 return -ENOMEM; 291 } 292 size = prot_size; 293 294 for_each_sg(fd_prot->prot_sg, sg, fd_prot->prot_sg_nents, i) { 295 296 len = min_t(u32, PAGE_SIZE, size); 297 sg_set_buf(sg, buf, len); 298 size -= len; 299 buf += len; 300 } 301 } 302 303 if (is_write) { 304 rc = kernel_write(prot_fd, fd_prot->prot_buf, prot_size, pos); 305 if (rc < 0 || prot_size != rc) { 306 pr_err("kernel_write() for fd_do_prot_rw failed:" 307 " %d\n", rc); 308 ret = -EINVAL; 309 } 310 } else { 311 rc = kernel_read(prot_fd, pos, fd_prot->prot_buf, prot_size); 312 if (rc < 0) { 313 pr_err("kernel_read() for fd_do_prot_rw failed:" 314 " %d\n", rc); 315 ret = -EINVAL; 316 } 317 } 318 319 if (is_write || ret < 0) { 320 kfree(fd_prot->prot_sg); 321 vfree(fd_prot->prot_buf); 322 } 323 324 return ret; 325 } 326 327 static int fd_do_rw(struct se_cmd *cmd, struct scatterlist *sgl, 328 u32 sgl_nents, int is_write) 329 { 330 struct se_device *se_dev = cmd->se_dev; 331 struct fd_dev *dev = FD_DEV(se_dev); 332 struct file *fd = dev->fd_file; 333 struct scatterlist *sg; 334 struct iovec *iov; 335 mm_segment_t old_fs; 336 loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size); 337 int ret = 0, i; 338 339 iov = kzalloc(sizeof(struct iovec) * sgl_nents, GFP_KERNEL); 340 if (!iov) { 341 pr_err("Unable to allocate fd_do_readv iov[]\n"); 342 return -ENOMEM; 343 } 344 345 for_each_sg(sgl, sg, sgl_nents, i) { 346 iov[i].iov_len = sg->length; 347 iov[i].iov_base = kmap(sg_page(sg)) + sg->offset; 348 } 349 350 old_fs = get_fs(); 351 set_fs(get_ds()); 352 353 if (is_write) 354 ret = vfs_writev(fd, &iov[0], sgl_nents, &pos); 355 else 356 ret = vfs_readv(fd, &iov[0], sgl_nents, &pos); 357 358 set_fs(old_fs); 359 360 for_each_sg(sgl, sg, sgl_nents, i) 361 kunmap(sg_page(sg)); 362 363 kfree(iov); 364 365 if (is_write) { 366 if (ret < 0 || ret != cmd->data_length) { 367 pr_err("%s() write returned %d\n", __func__, ret); 368 return (ret < 0 ? ret : -EINVAL); 369 } 370 } else { 371 /* 372 * Return zeros and GOOD status even if the READ did not return 373 * the expected virt_size for struct file w/o a backing struct 374 * block_device. 375 */ 376 if (S_ISBLK(file_inode(fd)->i_mode)) { 377 if (ret < 0 || ret != cmd->data_length) { 378 pr_err("%s() returned %d, expecting %u for " 379 "S_ISBLK\n", __func__, ret, 380 cmd->data_length); 381 return (ret < 0 ? ret : -EINVAL); 382 } 383 } else { 384 if (ret < 0) { 385 pr_err("%s() returned %d for non S_ISBLK\n", 386 __func__, ret); 387 return ret; 388 } 389 } 390 } 391 return 1; 392 } 393 394 static sense_reason_t 395 fd_execute_sync_cache(struct se_cmd *cmd) 396 { 397 struct se_device *dev = cmd->se_dev; 398 struct fd_dev *fd_dev = FD_DEV(dev); 399 int immed = (cmd->t_task_cdb[1] & 0x2); 400 loff_t start, end; 401 int ret; 402 403 /* 404 * If the Immediate bit is set, queue up the GOOD response 405 * for this SYNCHRONIZE_CACHE op 406 */ 407 if (immed) 408 target_complete_cmd(cmd, SAM_STAT_GOOD); 409 410 /* 411 * Determine if we will be flushing the entire device. 412 */ 413 if (cmd->t_task_lba == 0 && cmd->data_length == 0) { 414 start = 0; 415 end = LLONG_MAX; 416 } else { 417 start = cmd->t_task_lba * dev->dev_attrib.block_size; 418 if (cmd->data_length) 419 end = start + cmd->data_length - 1; 420 else 421 end = LLONG_MAX; 422 } 423 424 ret = vfs_fsync_range(fd_dev->fd_file, start, end, 1); 425 if (ret != 0) 426 pr_err("FILEIO: vfs_fsync_range() failed: %d\n", ret); 427 428 if (immed) 429 return 0; 430 431 if (ret) 432 target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION); 433 else 434 target_complete_cmd(cmd, SAM_STAT_GOOD); 435 436 return 0; 437 } 438 439 static unsigned char * 440 fd_setup_write_same_buf(struct se_cmd *cmd, struct scatterlist *sg, 441 unsigned int len) 442 { 443 struct se_device *se_dev = cmd->se_dev; 444 unsigned int block_size = se_dev->dev_attrib.block_size; 445 unsigned int i = 0, end; 446 unsigned char *buf, *p, *kmap_buf; 447 448 buf = kzalloc(min_t(unsigned int, len, PAGE_SIZE), GFP_KERNEL); 449 if (!buf) { 450 pr_err("Unable to allocate fd_execute_write_same buf\n"); 451 return NULL; 452 } 453 454 kmap_buf = kmap(sg_page(sg)) + sg->offset; 455 if (!kmap_buf) { 456 pr_err("kmap() failed in fd_setup_write_same\n"); 457 kfree(buf); 458 return NULL; 459 } 460 /* 461 * Fill local *buf to contain multiple WRITE_SAME blocks up to 462 * min(len, PAGE_SIZE) 463 */ 464 p = buf; 465 end = min_t(unsigned int, len, PAGE_SIZE); 466 467 while (i < end) { 468 memcpy(p, kmap_buf, block_size); 469 470 i += block_size; 471 p += block_size; 472 } 473 kunmap(sg_page(sg)); 474 475 return buf; 476 } 477 478 static sense_reason_t 479 fd_execute_write_same(struct se_cmd *cmd) 480 { 481 struct se_device *se_dev = cmd->se_dev; 482 struct fd_dev *fd_dev = FD_DEV(se_dev); 483 struct file *f = fd_dev->fd_file; 484 struct scatterlist *sg; 485 struct iovec *iov; 486 mm_segment_t old_fs; 487 sector_t nolb = sbc_get_write_same_sectors(cmd); 488 loff_t pos = cmd->t_task_lba * se_dev->dev_attrib.block_size; 489 unsigned int len, len_tmp, iov_num; 490 int i, rc; 491 unsigned char *buf; 492 493 if (!nolb) { 494 target_complete_cmd(cmd, SAM_STAT_GOOD); 495 return 0; 496 } 497 if (cmd->prot_op) { 498 pr_err("WRITE_SAME: Protection information with FILEIO" 499 " backends not supported\n"); 500 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 501 } 502 sg = &cmd->t_data_sg[0]; 503 504 if (cmd->t_data_nents > 1 || 505 sg->length != cmd->se_dev->dev_attrib.block_size) { 506 pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u" 507 " block_size: %u\n", cmd->t_data_nents, sg->length, 508 cmd->se_dev->dev_attrib.block_size); 509 return TCM_INVALID_CDB_FIELD; 510 } 511 512 len = len_tmp = nolb * se_dev->dev_attrib.block_size; 513 iov_num = DIV_ROUND_UP(len, PAGE_SIZE); 514 515 buf = fd_setup_write_same_buf(cmd, sg, len); 516 if (!buf) 517 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 518 519 iov = vzalloc(sizeof(struct iovec) * iov_num); 520 if (!iov) { 521 pr_err("Unable to allocate fd_execute_write_same iovecs\n"); 522 kfree(buf); 523 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 524 } 525 /* 526 * Map the single fabric received scatterlist block now populated 527 * in *buf into each iovec for I/O submission. 528 */ 529 for (i = 0; i < iov_num; i++) { 530 iov[i].iov_base = buf; 531 iov[i].iov_len = min_t(unsigned int, len_tmp, PAGE_SIZE); 532 len_tmp -= iov[i].iov_len; 533 } 534 535 old_fs = get_fs(); 536 set_fs(get_ds()); 537 rc = vfs_writev(f, &iov[0], iov_num, &pos); 538 set_fs(old_fs); 539 540 vfree(iov); 541 kfree(buf); 542 543 if (rc < 0 || rc != len) { 544 pr_err("vfs_writev() returned %d for write same\n", rc); 545 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 546 } 547 548 target_complete_cmd(cmd, SAM_STAT_GOOD); 549 return 0; 550 } 551 552 static sense_reason_t 553 fd_do_unmap(struct se_cmd *cmd, void *priv, sector_t lba, sector_t nolb) 554 { 555 struct file *file = priv; 556 struct inode *inode = file->f_mapping->host; 557 int ret; 558 559 if (S_ISBLK(inode->i_mode)) { 560 /* The backend is block device, use discard */ 561 struct block_device *bdev = inode->i_bdev; 562 563 ret = blkdev_issue_discard(bdev, lba, 564 nolb, GFP_KERNEL, 0); 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_write_same_unmap(struct se_cmd *cmd) 592 { 593 struct se_device *se_dev = cmd->se_dev; 594 struct fd_dev *fd_dev = FD_DEV(se_dev); 595 struct file *file = fd_dev->fd_file; 596 sector_t lba = cmd->t_task_lba; 597 sector_t nolb = sbc_get_write_same_sectors(cmd); 598 int ret; 599 600 if (!nolb) { 601 target_complete_cmd(cmd, SAM_STAT_GOOD); 602 return 0; 603 } 604 605 ret = fd_do_unmap(cmd, file, lba, nolb); 606 if (ret) 607 return ret; 608 609 target_complete_cmd(cmd, GOOD); 610 return 0; 611 } 612 613 static sense_reason_t 614 fd_execute_unmap(struct se_cmd *cmd) 615 { 616 struct file *file = FD_DEV(cmd->se_dev)->fd_file; 617 618 return sbc_execute_unmap(cmd, fd_do_unmap, file); 619 } 620 621 static sense_reason_t 622 fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 623 enum dma_data_direction data_direction) 624 { 625 struct se_device *dev = cmd->se_dev; 626 struct fd_prot fd_prot; 627 sense_reason_t rc; 628 int ret = 0; 629 /* 630 * We are currently limited by the number of iovecs (2048) per 631 * single vfs_[writev,readv] call. 632 */ 633 if (cmd->data_length > FD_MAX_BYTES) { 634 pr_err("FILEIO: Not able to process I/O of %u bytes due to" 635 "FD_MAX_BYTES: %u iovec count limitiation\n", 636 cmd->data_length, FD_MAX_BYTES); 637 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 638 } 639 /* 640 * Call vectorized fileio functions to map struct scatterlist 641 * physical memory addresses to struct iovec virtual memory. 642 */ 643 if (data_direction == DMA_FROM_DEVICE) { 644 memset(&fd_prot, 0, sizeof(struct fd_prot)); 645 646 if (cmd->prot_type) { 647 ret = fd_do_prot_rw(cmd, &fd_prot, false); 648 if (ret < 0) 649 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 650 } 651 652 ret = fd_do_rw(cmd, sgl, sgl_nents, 0); 653 654 if (ret > 0 && cmd->prot_type) { 655 u32 sectors = cmd->data_length / dev->dev_attrib.block_size; 656 657 rc = sbc_dif_verify_read(cmd, cmd->t_task_lba, sectors, 658 0, fd_prot.prot_sg, 0); 659 if (rc) { 660 kfree(fd_prot.prot_sg); 661 vfree(fd_prot.prot_buf); 662 return rc; 663 } 664 kfree(fd_prot.prot_sg); 665 vfree(fd_prot.prot_buf); 666 } 667 } else { 668 memset(&fd_prot, 0, sizeof(struct fd_prot)); 669 670 if (cmd->prot_type) { 671 u32 sectors = cmd->data_length / dev->dev_attrib.block_size; 672 673 ret = fd_do_prot_rw(cmd, &fd_prot, false); 674 if (ret < 0) 675 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 676 677 rc = sbc_dif_verify_write(cmd, cmd->t_task_lba, sectors, 678 0, fd_prot.prot_sg, 0); 679 if (rc) { 680 kfree(fd_prot.prot_sg); 681 vfree(fd_prot.prot_buf); 682 return rc; 683 } 684 } 685 686 ret = fd_do_rw(cmd, sgl, sgl_nents, 1); 687 /* 688 * Perform implicit vfs_fsync_range() for fd_do_writev() ops 689 * for SCSI WRITEs with Forced Unit Access (FUA) set. 690 * Allow this to happen independent of WCE=0 setting. 691 */ 692 if (ret > 0 && 693 dev->dev_attrib.emulate_fua_write > 0 && 694 (cmd->se_cmd_flags & SCF_FUA)) { 695 struct fd_dev *fd_dev = FD_DEV(dev); 696 loff_t start = cmd->t_task_lba * 697 dev->dev_attrib.block_size; 698 loff_t end; 699 700 if (cmd->data_length) 701 end = start + cmd->data_length - 1; 702 else 703 end = LLONG_MAX; 704 705 vfs_fsync_range(fd_dev->fd_file, start, end, 1); 706 } 707 708 if (ret > 0 && cmd->prot_type) { 709 ret = fd_do_prot_rw(cmd, &fd_prot, true); 710 if (ret < 0) 711 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 712 } 713 } 714 715 if (ret < 0) { 716 kfree(fd_prot.prot_sg); 717 vfree(fd_prot.prot_buf); 718 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 719 } 720 721 if (ret) 722 target_complete_cmd(cmd, SAM_STAT_GOOD); 723 return 0; 724 } 725 726 enum { 727 Opt_fd_dev_name, Opt_fd_dev_size, Opt_fd_buffered_io, Opt_err 728 }; 729 730 static match_table_t tokens = { 731 {Opt_fd_dev_name, "fd_dev_name=%s"}, 732 {Opt_fd_dev_size, "fd_dev_size=%s"}, 733 {Opt_fd_buffered_io, "fd_buffered_io=%d"}, 734 {Opt_err, NULL} 735 }; 736 737 static ssize_t fd_set_configfs_dev_params(struct se_device *dev, 738 const char *page, ssize_t count) 739 { 740 struct fd_dev *fd_dev = FD_DEV(dev); 741 char *orig, *ptr, *arg_p, *opts; 742 substring_t args[MAX_OPT_ARGS]; 743 int ret = 0, arg, token; 744 745 opts = kstrdup(page, GFP_KERNEL); 746 if (!opts) 747 return -ENOMEM; 748 749 orig = opts; 750 751 while ((ptr = strsep(&opts, ",\n")) != NULL) { 752 if (!*ptr) 753 continue; 754 755 token = match_token(ptr, tokens, args); 756 switch (token) { 757 case Opt_fd_dev_name: 758 if (match_strlcpy(fd_dev->fd_dev_name, &args[0], 759 FD_MAX_DEV_NAME) == 0) { 760 ret = -EINVAL; 761 break; 762 } 763 pr_debug("FILEIO: Referencing Path: %s\n", 764 fd_dev->fd_dev_name); 765 fd_dev->fbd_flags |= FBDF_HAS_PATH; 766 break; 767 case Opt_fd_dev_size: 768 arg_p = match_strdup(&args[0]); 769 if (!arg_p) { 770 ret = -ENOMEM; 771 break; 772 } 773 ret = kstrtoull(arg_p, 0, &fd_dev->fd_dev_size); 774 kfree(arg_p); 775 if (ret < 0) { 776 pr_err("kstrtoull() failed for" 777 " fd_dev_size=\n"); 778 goto out; 779 } 780 pr_debug("FILEIO: Referencing Size: %llu" 781 " bytes\n", fd_dev->fd_dev_size); 782 fd_dev->fbd_flags |= FBDF_HAS_SIZE; 783 break; 784 case Opt_fd_buffered_io: 785 ret = match_int(args, &arg); 786 if (ret) 787 goto out; 788 if (arg != 1) { 789 pr_err("bogus fd_buffered_io=%d value\n", arg); 790 ret = -EINVAL; 791 goto out; 792 } 793 794 pr_debug("FILEIO: Using buffered I/O" 795 " operations for struct fd_dev\n"); 796 797 fd_dev->fbd_flags |= FDBD_HAS_BUFFERED_IO_WCE; 798 break; 799 default: 800 break; 801 } 802 } 803 804 out: 805 kfree(orig); 806 return (!ret) ? count : ret; 807 } 808 809 static ssize_t fd_show_configfs_dev_params(struct se_device *dev, char *b) 810 { 811 struct fd_dev *fd_dev = FD_DEV(dev); 812 ssize_t bl = 0; 813 814 bl = sprintf(b + bl, "TCM FILEIO ID: %u", fd_dev->fd_dev_id); 815 bl += sprintf(b + bl, " File: %s Size: %llu Mode: %s\n", 816 fd_dev->fd_dev_name, fd_dev->fd_dev_size, 817 (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) ? 818 "Buffered-WCE" : "O_DSYNC"); 819 return bl; 820 } 821 822 static sector_t fd_get_blocks(struct se_device *dev) 823 { 824 struct fd_dev *fd_dev = FD_DEV(dev); 825 struct file *f = fd_dev->fd_file; 826 struct inode *i = f->f_mapping->host; 827 unsigned long long dev_size; 828 /* 829 * When using a file that references an underlying struct block_device, 830 * ensure dev_size is always based on the current inode size in order 831 * to handle underlying block_device resize operations. 832 */ 833 if (S_ISBLK(i->i_mode)) 834 dev_size = i_size_read(i); 835 else 836 dev_size = fd_dev->fd_dev_size; 837 838 return div_u64(dev_size - dev->dev_attrib.block_size, 839 dev->dev_attrib.block_size); 840 } 841 842 static int fd_init_prot(struct se_device *dev) 843 { 844 struct fd_dev *fd_dev = FD_DEV(dev); 845 struct file *prot_file, *file = fd_dev->fd_file; 846 struct inode *inode; 847 int ret, flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC; 848 char buf[FD_MAX_DEV_PROT_NAME]; 849 850 if (!file) { 851 pr_err("Unable to locate fd_dev->fd_file\n"); 852 return -ENODEV; 853 } 854 855 inode = file->f_mapping->host; 856 if (S_ISBLK(inode->i_mode)) { 857 pr_err("FILEIO Protection emulation only supported on" 858 " !S_ISBLK\n"); 859 return -ENOSYS; 860 } 861 862 if (fd_dev->fbd_flags & FDBD_HAS_BUFFERED_IO_WCE) 863 flags &= ~O_DSYNC; 864 865 snprintf(buf, FD_MAX_DEV_PROT_NAME, "%s.protection", 866 fd_dev->fd_dev_name); 867 868 prot_file = filp_open(buf, flags, 0600); 869 if (IS_ERR(prot_file)) { 870 pr_err("filp_open(%s) failed\n", buf); 871 ret = PTR_ERR(prot_file); 872 return ret; 873 } 874 fd_dev->fd_prot_file = prot_file; 875 876 return 0; 877 } 878 879 static int fd_format_prot(struct se_device *dev) 880 { 881 struct fd_dev *fd_dev = FD_DEV(dev); 882 struct file *prot_fd = fd_dev->fd_prot_file; 883 sector_t prot_length, prot; 884 unsigned char *buf; 885 loff_t pos = 0; 886 int unit_size = FDBD_FORMAT_UNIT_SIZE * dev->dev_attrib.block_size; 887 int rc, ret = 0, size, len; 888 889 if (!dev->dev_attrib.pi_prot_type) { 890 pr_err("Unable to format_prot while pi_prot_type == 0\n"); 891 return -ENODEV; 892 } 893 if (!prot_fd) { 894 pr_err("Unable to locate fd_dev->fd_prot_file\n"); 895 return -ENODEV; 896 } 897 898 buf = vzalloc(unit_size); 899 if (!buf) { 900 pr_err("Unable to allocate FILEIO prot buf\n"); 901 return -ENOMEM; 902 } 903 prot_length = (dev->transport->get_blocks(dev) + 1) * dev->prot_length; 904 size = prot_length; 905 906 pr_debug("Using FILEIO prot_length: %llu\n", 907 (unsigned long long)prot_length); 908 909 memset(buf, 0xff, unit_size); 910 for (prot = 0; prot < prot_length; prot += unit_size) { 911 len = min(unit_size, size); 912 rc = kernel_write(prot_fd, buf, len, pos); 913 if (rc != len) { 914 pr_err("vfs_write to prot file failed: %d\n", rc); 915 ret = -ENODEV; 916 goto out; 917 } 918 pos += len; 919 size -= len; 920 } 921 922 out: 923 vfree(buf); 924 return ret; 925 } 926 927 static void fd_free_prot(struct se_device *dev) 928 { 929 struct fd_dev *fd_dev = FD_DEV(dev); 930 931 if (!fd_dev->fd_prot_file) 932 return; 933 934 filp_close(fd_dev->fd_prot_file, NULL); 935 fd_dev->fd_prot_file = NULL; 936 } 937 938 static struct sbc_ops fd_sbc_ops = { 939 .execute_rw = fd_execute_rw, 940 .execute_sync_cache = fd_execute_sync_cache, 941 .execute_write_same = fd_execute_write_same, 942 .execute_write_same_unmap = fd_execute_write_same_unmap, 943 .execute_unmap = fd_execute_unmap, 944 }; 945 946 static sense_reason_t 947 fd_parse_cdb(struct se_cmd *cmd) 948 { 949 return sbc_parse_cdb(cmd, &fd_sbc_ops); 950 } 951 952 DEF_TB_DEFAULT_ATTRIBS(fileio); 953 954 static struct configfs_attribute *fileio_backend_dev_attrs[] = { 955 &fileio_dev_attrib_emulate_model_alias.attr, 956 &fileio_dev_attrib_emulate_dpo.attr, 957 &fileio_dev_attrib_emulate_fua_write.attr, 958 &fileio_dev_attrib_emulate_fua_read.attr, 959 &fileio_dev_attrib_emulate_write_cache.attr, 960 &fileio_dev_attrib_emulate_ua_intlck_ctrl.attr, 961 &fileio_dev_attrib_emulate_tas.attr, 962 &fileio_dev_attrib_emulate_tpu.attr, 963 &fileio_dev_attrib_emulate_tpws.attr, 964 &fileio_dev_attrib_emulate_caw.attr, 965 &fileio_dev_attrib_emulate_3pc.attr, 966 &fileio_dev_attrib_pi_prot_type.attr, 967 &fileio_dev_attrib_hw_pi_prot_type.attr, 968 &fileio_dev_attrib_pi_prot_format.attr, 969 &fileio_dev_attrib_enforce_pr_isids.attr, 970 &fileio_dev_attrib_is_nonrot.attr, 971 &fileio_dev_attrib_emulate_rest_reord.attr, 972 &fileio_dev_attrib_force_pr_aptpl.attr, 973 &fileio_dev_attrib_hw_block_size.attr, 974 &fileio_dev_attrib_block_size.attr, 975 &fileio_dev_attrib_hw_max_sectors.attr, 976 &fileio_dev_attrib_optimal_sectors.attr, 977 &fileio_dev_attrib_hw_queue_depth.attr, 978 &fileio_dev_attrib_queue_depth.attr, 979 &fileio_dev_attrib_max_unmap_lba_count.attr, 980 &fileio_dev_attrib_max_unmap_block_desc_count.attr, 981 &fileio_dev_attrib_unmap_granularity.attr, 982 &fileio_dev_attrib_unmap_granularity_alignment.attr, 983 &fileio_dev_attrib_max_write_same_len.attr, 984 NULL, 985 }; 986 987 static struct se_subsystem_api fileio_template = { 988 .name = "fileio", 989 .inquiry_prod = "FILEIO", 990 .inquiry_rev = FD_VERSION, 991 .owner = THIS_MODULE, 992 .transport_type = TRANSPORT_PLUGIN_VHBA_PDEV, 993 .attach_hba = fd_attach_hba, 994 .detach_hba = fd_detach_hba, 995 .alloc_device = fd_alloc_device, 996 .configure_device = fd_configure_device, 997 .free_device = fd_free_device, 998 .parse_cdb = fd_parse_cdb, 999 .set_configfs_dev_params = fd_set_configfs_dev_params, 1000 .show_configfs_dev_params = fd_show_configfs_dev_params, 1001 .get_device_type = sbc_get_device_type, 1002 .get_blocks = fd_get_blocks, 1003 .init_prot = fd_init_prot, 1004 .format_prot = fd_format_prot, 1005 .free_prot = fd_free_prot, 1006 }; 1007 1008 static int __init fileio_module_init(void) 1009 { 1010 struct target_backend_cits *tbc = &fileio_template.tb_cits; 1011 1012 target_core_setup_sub_cits(&fileio_template); 1013 tbc->tb_dev_attrib_cit.ct_attrs = fileio_backend_dev_attrs; 1014 1015 return transport_subsystem_register(&fileio_template); 1016 } 1017 1018 static void __exit fileio_module_exit(void) 1019 { 1020 transport_subsystem_release(&fileio_template); 1021 } 1022 1023 MODULE_DESCRIPTION("TCM FILEIO subsystem plugin"); 1024 MODULE_AUTHOR("nab@Linux-iSCSI.org"); 1025 MODULE_LICENSE("GPL"); 1026 1027 module_init(fileio_module_init); 1028 module_exit(fileio_module_exit); 1029