1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/9p/vfs_file.c 4 * 5 * This file contians vfs file ops for 9P2000. 6 * 7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 9 */ 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/sched.h> 15 #include <linux/file.h> 16 #include <linux/stat.h> 17 #include <linux/string.h> 18 #include <linux/inet.h> 19 #include <linux/list.h> 20 #include <linux/pagemap.h> 21 #include <linux/utsname.h> 22 #include <linux/uaccess.h> 23 #include <linux/idr.h> 24 #include <linux/uio.h> 25 #include <linux/slab.h> 26 #include <net/9p/9p.h> 27 #include <net/9p/client.h> 28 29 #include "v9fs.h" 30 #include "v9fs_vfs.h" 31 #include "fid.h" 32 #include "cache.h" 33 34 static const struct vm_operations_struct v9fs_file_vm_ops; 35 static const struct vm_operations_struct v9fs_mmap_file_vm_ops; 36 37 /** 38 * v9fs_file_open - open a file (or directory) 39 * @inode: inode to be opened 40 * @file: file being opened 41 * 42 */ 43 44 int v9fs_file_open(struct inode *inode, struct file *file) 45 { 46 int err; 47 struct v9fs_inode *v9inode; 48 struct v9fs_session_info *v9ses; 49 struct p9_fid *fid, *writeback_fid; 50 int omode; 51 52 p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file); 53 v9inode = V9FS_I(inode); 54 v9ses = v9fs_inode2v9ses(inode); 55 if (v9fs_proto_dotl(v9ses)) 56 omode = v9fs_open_to_dotl_flags(file->f_flags); 57 else 58 omode = v9fs_uflags2omode(file->f_flags, 59 v9fs_proto_dotu(v9ses)); 60 fid = file->private_data; 61 if (!fid) { 62 fid = v9fs_fid_clone(file_dentry(file)); 63 if (IS_ERR(fid)) 64 return PTR_ERR(fid); 65 66 err = p9_client_open(fid, omode); 67 if (err < 0) { 68 p9_client_clunk(fid); 69 return err; 70 } 71 if ((file->f_flags & O_APPEND) && 72 (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses))) 73 generic_file_llseek(file, 0, SEEK_END); 74 } 75 76 file->private_data = fid; 77 mutex_lock(&v9inode->v_mutex); 78 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 79 !v9inode->writeback_fid && 80 ((file->f_flags & O_ACCMODE) != O_RDONLY)) { 81 /* 82 * clone a fid and add it to writeback_fid 83 * we do it during open time instead of 84 * page dirty time via write_begin/page_mkwrite 85 * because we want write after unlink usecase 86 * to work. 87 */ 88 writeback_fid = v9fs_writeback_fid(file_dentry(file)); 89 if (IS_ERR(fid)) { 90 err = PTR_ERR(fid); 91 mutex_unlock(&v9inode->v_mutex); 92 goto out_error; 93 } 94 v9inode->writeback_fid = (void *) writeback_fid; 95 } 96 mutex_unlock(&v9inode->v_mutex); 97 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 98 v9fs_cache_inode_set_cookie(inode, file); 99 v9fs_open_fid_add(inode, fid); 100 return 0; 101 out_error: 102 p9_client_clunk(file->private_data); 103 file->private_data = NULL; 104 return err; 105 } 106 107 /** 108 * v9fs_file_lock - lock a file (or directory) 109 * @filp: file to be locked 110 * @cmd: lock command 111 * @fl: file lock structure 112 * 113 * Bugs: this looks like a local only lock, we should extend into 9P 114 * by using open exclusive 115 */ 116 117 static int v9fs_file_lock(struct file *filp, int cmd, struct file_lock *fl) 118 { 119 int res = 0; 120 struct inode *inode = file_inode(filp); 121 122 p9_debug(P9_DEBUG_VFS, "filp: %p lock: %p\n", filp, fl); 123 124 /* No mandatory locks */ 125 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) 126 return -ENOLCK; 127 128 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { 129 filemap_write_and_wait(inode->i_mapping); 130 invalidate_mapping_pages(&inode->i_data, 0, -1); 131 } 132 133 return res; 134 } 135 136 static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) 137 { 138 struct p9_flock flock; 139 struct p9_fid *fid; 140 uint8_t status = P9_LOCK_ERROR; 141 int res = 0; 142 unsigned char fl_type; 143 struct v9fs_session_info *v9ses; 144 145 fid = filp->private_data; 146 BUG_ON(fid == NULL); 147 148 if ((fl->fl_flags & FL_POSIX) != FL_POSIX) 149 BUG(); 150 151 res = locks_lock_file_wait(filp, fl); 152 if (res < 0) 153 goto out; 154 155 /* convert posix lock to p9 tlock args */ 156 memset(&flock, 0, sizeof(flock)); 157 /* map the lock type */ 158 switch (fl->fl_type) { 159 case F_RDLCK: 160 flock.type = P9_LOCK_TYPE_RDLCK; 161 break; 162 case F_WRLCK: 163 flock.type = P9_LOCK_TYPE_WRLCK; 164 break; 165 case F_UNLCK: 166 flock.type = P9_LOCK_TYPE_UNLCK; 167 break; 168 } 169 flock.start = fl->fl_start; 170 if (fl->fl_end == OFFSET_MAX) 171 flock.length = 0; 172 else 173 flock.length = fl->fl_end - fl->fl_start + 1; 174 flock.proc_id = fl->fl_pid; 175 flock.client_id = fid->clnt->name; 176 if (IS_SETLKW(cmd)) 177 flock.flags = P9_LOCK_FLAGS_BLOCK; 178 179 v9ses = v9fs_inode2v9ses(file_inode(filp)); 180 181 /* 182 * if its a blocked request and we get P9_LOCK_BLOCKED as the status 183 * for lock request, keep on trying 184 */ 185 for (;;) { 186 res = p9_client_lock_dotl(fid, &flock, &status); 187 if (res < 0) 188 goto out_unlock; 189 190 if (status != P9_LOCK_BLOCKED) 191 break; 192 if (status == P9_LOCK_BLOCKED && !IS_SETLKW(cmd)) 193 break; 194 if (schedule_timeout_interruptible(v9ses->session_lock_timeout) 195 != 0) 196 break; 197 /* 198 * p9_client_lock_dotl overwrites flock.client_id with the 199 * server message, free and reuse the client name 200 */ 201 if (flock.client_id != fid->clnt->name) { 202 kfree(flock.client_id); 203 flock.client_id = fid->clnt->name; 204 } 205 } 206 207 /* map 9p status to VFS status */ 208 switch (status) { 209 case P9_LOCK_SUCCESS: 210 res = 0; 211 break; 212 case P9_LOCK_BLOCKED: 213 res = -EAGAIN; 214 break; 215 default: 216 WARN_ONCE(1, "unknown lock status code: %d\n", status); 217 fallthrough; 218 case P9_LOCK_ERROR: 219 case P9_LOCK_GRACE: 220 res = -ENOLCK; 221 break; 222 } 223 224 out_unlock: 225 /* 226 * incase server returned error for lock request, revert 227 * it locally 228 */ 229 if (res < 0 && fl->fl_type != F_UNLCK) { 230 fl_type = fl->fl_type; 231 fl->fl_type = F_UNLCK; 232 /* Even if this fails we want to return the remote error */ 233 locks_lock_file_wait(filp, fl); 234 fl->fl_type = fl_type; 235 } 236 if (flock.client_id != fid->clnt->name) 237 kfree(flock.client_id); 238 out: 239 return res; 240 } 241 242 static int v9fs_file_getlock(struct file *filp, struct file_lock *fl) 243 { 244 struct p9_getlock glock; 245 struct p9_fid *fid; 246 int res = 0; 247 248 fid = filp->private_data; 249 BUG_ON(fid == NULL); 250 251 posix_test_lock(filp, fl); 252 /* 253 * if we have a conflicting lock locally, no need to validate 254 * with server 255 */ 256 if (fl->fl_type != F_UNLCK) 257 return res; 258 259 /* convert posix lock to p9 tgetlock args */ 260 memset(&glock, 0, sizeof(glock)); 261 glock.type = P9_LOCK_TYPE_UNLCK; 262 glock.start = fl->fl_start; 263 if (fl->fl_end == OFFSET_MAX) 264 glock.length = 0; 265 else 266 glock.length = fl->fl_end - fl->fl_start + 1; 267 glock.proc_id = fl->fl_pid; 268 glock.client_id = fid->clnt->name; 269 270 res = p9_client_getlock_dotl(fid, &glock); 271 if (res < 0) 272 goto out; 273 /* map 9p lock type to os lock type */ 274 switch (glock.type) { 275 case P9_LOCK_TYPE_RDLCK: 276 fl->fl_type = F_RDLCK; 277 break; 278 case P9_LOCK_TYPE_WRLCK: 279 fl->fl_type = F_WRLCK; 280 break; 281 case P9_LOCK_TYPE_UNLCK: 282 fl->fl_type = F_UNLCK; 283 break; 284 } 285 if (glock.type != P9_LOCK_TYPE_UNLCK) { 286 fl->fl_start = glock.start; 287 if (glock.length == 0) 288 fl->fl_end = OFFSET_MAX; 289 else 290 fl->fl_end = glock.start + glock.length - 1; 291 fl->fl_pid = -glock.proc_id; 292 } 293 out: 294 if (glock.client_id != fid->clnt->name) 295 kfree(glock.client_id); 296 return res; 297 } 298 299 /** 300 * v9fs_file_lock_dotl - lock a file (or directory) 301 * @filp: file to be locked 302 * @cmd: lock command 303 * @fl: file lock structure 304 * 305 */ 306 307 static int v9fs_file_lock_dotl(struct file *filp, int cmd, struct file_lock *fl) 308 { 309 struct inode *inode = file_inode(filp); 310 int ret = -ENOLCK; 311 312 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n", 313 filp, cmd, fl, filp); 314 315 /* No mandatory locks */ 316 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) 317 goto out_err; 318 319 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { 320 filemap_write_and_wait(inode->i_mapping); 321 invalidate_mapping_pages(&inode->i_data, 0, -1); 322 } 323 324 if (IS_SETLK(cmd) || IS_SETLKW(cmd)) 325 ret = v9fs_file_do_lock(filp, cmd, fl); 326 else if (IS_GETLK(cmd)) 327 ret = v9fs_file_getlock(filp, fl); 328 else 329 ret = -EINVAL; 330 out_err: 331 return ret; 332 } 333 334 /** 335 * v9fs_file_flock_dotl - lock a file 336 * @filp: file to be locked 337 * @cmd: lock command 338 * @fl: file lock structure 339 * 340 */ 341 342 static int v9fs_file_flock_dotl(struct file *filp, int cmd, 343 struct file_lock *fl) 344 { 345 struct inode *inode = file_inode(filp); 346 int ret = -ENOLCK; 347 348 p9_debug(P9_DEBUG_VFS, "filp: %p cmd:%d lock: %p name: %pD\n", 349 filp, cmd, fl, filp); 350 351 /* No mandatory locks */ 352 if (__mandatory_lock(inode) && fl->fl_type != F_UNLCK) 353 goto out_err; 354 355 if (!(fl->fl_flags & FL_FLOCK)) 356 goto out_err; 357 358 if ((IS_SETLK(cmd) || IS_SETLKW(cmd)) && fl->fl_type != F_UNLCK) { 359 filemap_write_and_wait(inode->i_mapping); 360 invalidate_mapping_pages(&inode->i_data, 0, -1); 361 } 362 /* Convert flock to posix lock */ 363 fl->fl_flags |= FL_POSIX; 364 fl->fl_flags ^= FL_FLOCK; 365 366 if (IS_SETLK(cmd) | IS_SETLKW(cmd)) 367 ret = v9fs_file_do_lock(filp, cmd, fl); 368 else 369 ret = -EINVAL; 370 out_err: 371 return ret; 372 } 373 374 /** 375 * v9fs_file_read - read from a file 376 * @filp: file pointer to read 377 * @udata: user data buffer to read data into 378 * @count: size of buffer 379 * @offset: offset at which to read data 380 * 381 */ 382 383 static ssize_t 384 v9fs_file_read_iter(struct kiocb *iocb, struct iov_iter *to) 385 { 386 struct p9_fid *fid = iocb->ki_filp->private_data; 387 int ret, err = 0; 388 389 p9_debug(P9_DEBUG_VFS, "count %zu offset %lld\n", 390 iov_iter_count(to), iocb->ki_pos); 391 392 if (iocb->ki_filp->f_flags & O_NONBLOCK) 393 ret = p9_client_read_once(fid, iocb->ki_pos, to, &err); 394 else 395 ret = p9_client_read(fid, iocb->ki_pos, to, &err); 396 if (!ret) 397 return err; 398 399 iocb->ki_pos += ret; 400 return ret; 401 } 402 403 /** 404 * v9fs_file_write - write to a file 405 * @filp: file pointer to write 406 * @data: data buffer to write data from 407 * @count: size of buffer 408 * @offset: offset at which to write data 409 * 410 */ 411 static ssize_t 412 v9fs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) 413 { 414 struct file *file = iocb->ki_filp; 415 ssize_t retval; 416 loff_t origin; 417 int err = 0; 418 419 retval = generic_write_checks(iocb, from); 420 if (retval <= 0) 421 return retval; 422 423 origin = iocb->ki_pos; 424 retval = p9_client_write(file->private_data, iocb->ki_pos, from, &err); 425 if (retval > 0) { 426 struct inode *inode = file_inode(file); 427 loff_t i_size; 428 unsigned long pg_start, pg_end; 429 pg_start = origin >> PAGE_SHIFT; 430 pg_end = (origin + retval - 1) >> PAGE_SHIFT; 431 if (inode->i_mapping && inode->i_mapping->nrpages) 432 invalidate_inode_pages2_range(inode->i_mapping, 433 pg_start, pg_end); 434 iocb->ki_pos += retval; 435 i_size = i_size_read(inode); 436 if (iocb->ki_pos > i_size) { 437 inode_add_bytes(inode, iocb->ki_pos - i_size); 438 /* 439 * Need to serialize against i_size_write() in 440 * v9fs_stat2inode() 441 */ 442 v9fs_i_size_write(inode, iocb->ki_pos); 443 } 444 return retval; 445 } 446 return err; 447 } 448 449 static int v9fs_file_fsync(struct file *filp, loff_t start, loff_t end, 450 int datasync) 451 { 452 struct p9_fid *fid; 453 struct inode *inode = filp->f_mapping->host; 454 struct p9_wstat wstat; 455 int retval; 456 457 retval = file_write_and_wait_range(filp, start, end); 458 if (retval) 459 return retval; 460 461 inode_lock(inode); 462 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); 463 464 fid = filp->private_data; 465 v9fs_blank_wstat(&wstat); 466 467 retval = p9_client_wstat(fid, &wstat); 468 inode_unlock(inode); 469 470 return retval; 471 } 472 473 int v9fs_file_fsync_dotl(struct file *filp, loff_t start, loff_t end, 474 int datasync) 475 { 476 struct p9_fid *fid; 477 struct inode *inode = filp->f_mapping->host; 478 int retval; 479 480 retval = file_write_and_wait_range(filp, start, end); 481 if (retval) 482 return retval; 483 484 inode_lock(inode); 485 p9_debug(P9_DEBUG_VFS, "filp %p datasync %x\n", filp, datasync); 486 487 fid = filp->private_data; 488 489 retval = p9_client_fsync(fid, datasync); 490 inode_unlock(inode); 491 492 return retval; 493 } 494 495 static int 496 v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma) 497 { 498 int retval; 499 500 501 retval = generic_file_mmap(filp, vma); 502 if (!retval) 503 vma->vm_ops = &v9fs_file_vm_ops; 504 505 return retval; 506 } 507 508 static int 509 v9fs_mmap_file_mmap(struct file *filp, struct vm_area_struct *vma) 510 { 511 int retval; 512 struct inode *inode; 513 struct v9fs_inode *v9inode; 514 struct p9_fid *fid; 515 516 inode = file_inode(filp); 517 v9inode = V9FS_I(inode); 518 mutex_lock(&v9inode->v_mutex); 519 if (!v9inode->writeback_fid && 520 (vma->vm_flags & VM_SHARED) && 521 (vma->vm_flags & VM_WRITE)) { 522 /* 523 * clone a fid and add it to writeback_fid 524 * we do it during mmap instead of 525 * page dirty time via write_begin/page_mkwrite 526 * because we want write after unlink usecase 527 * to work. 528 */ 529 fid = v9fs_writeback_fid(file_dentry(filp)); 530 if (IS_ERR(fid)) { 531 retval = PTR_ERR(fid); 532 mutex_unlock(&v9inode->v_mutex); 533 return retval; 534 } 535 v9inode->writeback_fid = (void *) fid; 536 } 537 mutex_unlock(&v9inode->v_mutex); 538 539 retval = generic_file_mmap(filp, vma); 540 if (!retval) 541 vma->vm_ops = &v9fs_mmap_file_vm_ops; 542 543 return retval; 544 } 545 546 static vm_fault_t 547 v9fs_vm_page_mkwrite(struct vm_fault *vmf) 548 { 549 struct v9fs_inode *v9inode; 550 struct page *page = vmf->page; 551 struct file *filp = vmf->vma->vm_file; 552 struct inode *inode = file_inode(filp); 553 554 555 p9_debug(P9_DEBUG_VFS, "page %p fid %lx\n", 556 page, (unsigned long)filp->private_data); 557 558 /* Update file times before taking page lock */ 559 file_update_time(filp); 560 561 v9inode = V9FS_I(inode); 562 /* make sure the cache has finished storing the page */ 563 v9fs_fscache_wait_on_page_write(inode, page); 564 BUG_ON(!v9inode->writeback_fid); 565 lock_page(page); 566 if (page->mapping != inode->i_mapping) 567 goto out_unlock; 568 wait_for_stable_page(page); 569 570 return VM_FAULT_LOCKED; 571 out_unlock: 572 unlock_page(page); 573 return VM_FAULT_NOPAGE; 574 } 575 576 /** 577 * v9fs_mmap_file_read - read from a file 578 * @filp: file pointer to read 579 * @data: user data buffer to read data into 580 * @count: size of buffer 581 * @offset: offset at which to read data 582 * 583 */ 584 static ssize_t 585 v9fs_mmap_file_read_iter(struct kiocb *iocb, struct iov_iter *to) 586 { 587 /* TODO: Check if there are dirty pages */ 588 return v9fs_file_read_iter(iocb, to); 589 } 590 591 /** 592 * v9fs_mmap_file_write - write to a file 593 * @filp: file pointer to write 594 * @data: data buffer to write data from 595 * @count: size of buffer 596 * @offset: offset at which to write data 597 * 598 */ 599 static ssize_t 600 v9fs_mmap_file_write_iter(struct kiocb *iocb, struct iov_iter *from) 601 { 602 /* 603 * TODO: invalidate mmaps on filp's inode between 604 * offset and offset+count 605 */ 606 return v9fs_file_write_iter(iocb, from); 607 } 608 609 static void v9fs_mmap_vm_close(struct vm_area_struct *vma) 610 { 611 struct inode *inode; 612 613 struct writeback_control wbc = { 614 .nr_to_write = LONG_MAX, 615 .sync_mode = WB_SYNC_ALL, 616 .range_start = (loff_t)vma->vm_pgoff * PAGE_SIZE, 617 /* absolute end, byte at end included */ 618 .range_end = (loff_t)vma->vm_pgoff * PAGE_SIZE + 619 (vma->vm_end - vma->vm_start - 1), 620 }; 621 622 if (!(vma->vm_flags & VM_SHARED)) 623 return; 624 625 p9_debug(P9_DEBUG_VFS, "9p VMA close, %p, flushing", vma); 626 627 inode = file_inode(vma->vm_file); 628 629 if (!mapping_can_writeback(inode->i_mapping)) 630 wbc.nr_to_write = 0; 631 632 might_sleep(); 633 sync_inode(inode, &wbc); 634 } 635 636 637 static const struct vm_operations_struct v9fs_file_vm_ops = { 638 .fault = filemap_fault, 639 .map_pages = filemap_map_pages, 640 .page_mkwrite = v9fs_vm_page_mkwrite, 641 }; 642 643 static const struct vm_operations_struct v9fs_mmap_file_vm_ops = { 644 .close = v9fs_mmap_vm_close, 645 .fault = filemap_fault, 646 .map_pages = filemap_map_pages, 647 .page_mkwrite = v9fs_vm_page_mkwrite, 648 }; 649 650 651 const struct file_operations v9fs_cached_file_operations = { 652 .llseek = generic_file_llseek, 653 .read_iter = generic_file_read_iter, 654 .write_iter = generic_file_write_iter, 655 .open = v9fs_file_open, 656 .release = v9fs_dir_release, 657 .lock = v9fs_file_lock, 658 .mmap = v9fs_file_mmap, 659 .splice_read = generic_file_splice_read, 660 .splice_write = iter_file_splice_write, 661 .fsync = v9fs_file_fsync, 662 }; 663 664 const struct file_operations v9fs_cached_file_operations_dotl = { 665 .llseek = generic_file_llseek, 666 .read_iter = generic_file_read_iter, 667 .write_iter = generic_file_write_iter, 668 .open = v9fs_file_open, 669 .release = v9fs_dir_release, 670 .lock = v9fs_file_lock_dotl, 671 .flock = v9fs_file_flock_dotl, 672 .mmap = v9fs_file_mmap, 673 .splice_read = generic_file_splice_read, 674 .splice_write = iter_file_splice_write, 675 .fsync = v9fs_file_fsync_dotl, 676 }; 677 678 const struct file_operations v9fs_file_operations = { 679 .llseek = generic_file_llseek, 680 .read_iter = v9fs_file_read_iter, 681 .write_iter = v9fs_file_write_iter, 682 .open = v9fs_file_open, 683 .release = v9fs_dir_release, 684 .lock = v9fs_file_lock, 685 .mmap = generic_file_readonly_mmap, 686 .splice_read = generic_file_splice_read, 687 .splice_write = iter_file_splice_write, 688 .fsync = v9fs_file_fsync, 689 }; 690 691 const struct file_operations v9fs_file_operations_dotl = { 692 .llseek = generic_file_llseek, 693 .read_iter = v9fs_file_read_iter, 694 .write_iter = v9fs_file_write_iter, 695 .open = v9fs_file_open, 696 .release = v9fs_dir_release, 697 .lock = v9fs_file_lock_dotl, 698 .flock = v9fs_file_flock_dotl, 699 .mmap = generic_file_readonly_mmap, 700 .splice_read = generic_file_splice_read, 701 .splice_write = iter_file_splice_write, 702 .fsync = v9fs_file_fsync_dotl, 703 }; 704 705 const struct file_operations v9fs_mmap_file_operations = { 706 .llseek = generic_file_llseek, 707 .read_iter = v9fs_mmap_file_read_iter, 708 .write_iter = v9fs_mmap_file_write_iter, 709 .open = v9fs_file_open, 710 .release = v9fs_dir_release, 711 .lock = v9fs_file_lock, 712 .mmap = v9fs_mmap_file_mmap, 713 .splice_read = generic_file_splice_read, 714 .splice_write = iter_file_splice_write, 715 .fsync = v9fs_file_fsync, 716 }; 717 718 const struct file_operations v9fs_mmap_file_operations_dotl = { 719 .llseek = generic_file_llseek, 720 .read_iter = v9fs_mmap_file_read_iter, 721 .write_iter = v9fs_mmap_file_write_iter, 722 .open = v9fs_file_open, 723 .release = v9fs_dir_release, 724 .lock = v9fs_file_lock_dotl, 725 .flock = v9fs_file_flock_dotl, 726 .mmap = v9fs_mmap_file_mmap, 727 .splice_read = generic_file_splice_read, 728 .splice_write = iter_file_splice_write, 729 .fsync = v9fs_file_fsync_dotl, 730 }; 731