1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/9p/vfs_inode.c 4 * 5 * This file contains vfs inode ops for the 9P2000 protocol. 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13 #include <linux/module.h> 14 #include <linux/errno.h> 15 #include <linux/fs.h> 16 #include <linux/file.h> 17 #include <linux/pagemap.h> 18 #include <linux/stat.h> 19 #include <linux/string.h> 20 #include <linux/inet.h> 21 #include <linux/namei.h> 22 #include <linux/idr.h> 23 #include <linux/sched.h> 24 #include <linux/slab.h> 25 #include <linux/xattr.h> 26 #include <linux/posix_acl.h> 27 #include <net/9p/9p.h> 28 #include <net/9p/client.h> 29 30 #include "v9fs.h" 31 #include "v9fs_vfs.h" 32 #include "fid.h" 33 #include "cache.h" 34 #include "xattr.h" 35 #include "acl.h" 36 37 static const struct inode_operations v9fs_dir_inode_operations; 38 static const struct inode_operations v9fs_dir_inode_operations_dotu; 39 static const struct inode_operations v9fs_file_inode_operations; 40 static const struct inode_operations v9fs_symlink_inode_operations; 41 42 /** 43 * unixmode2p9mode - convert unix mode bits to plan 9 44 * @v9ses: v9fs session information 45 * @mode: mode to convert 46 * 47 */ 48 49 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 50 { 51 int res; 52 res = mode & 0777; 53 if (S_ISDIR(mode)) 54 res |= P9_DMDIR; 55 if (v9fs_proto_dotu(v9ses)) { 56 if (v9ses->nodev == 0) { 57 if (S_ISSOCK(mode)) 58 res |= P9_DMSOCKET; 59 if (S_ISFIFO(mode)) 60 res |= P9_DMNAMEDPIPE; 61 if (S_ISBLK(mode)) 62 res |= P9_DMDEVICE; 63 if (S_ISCHR(mode)) 64 res |= P9_DMDEVICE; 65 } 66 67 if ((mode & S_ISUID) == S_ISUID) 68 res |= P9_DMSETUID; 69 if ((mode & S_ISGID) == S_ISGID) 70 res |= P9_DMSETGID; 71 if ((mode & S_ISVTX) == S_ISVTX) 72 res |= P9_DMSETVTX; 73 } 74 return res; 75 } 76 77 /** 78 * p9mode2perm- convert plan9 mode bits to unix permission bits 79 * @v9ses: v9fs session information 80 * @stat: p9_wstat from which mode need to be derived 81 * 82 */ 83 static int p9mode2perm(struct v9fs_session_info *v9ses, 84 struct p9_wstat *stat) 85 { 86 int res; 87 int mode = stat->mode; 88 89 res = mode & S_IALLUGO; 90 if (v9fs_proto_dotu(v9ses)) { 91 if ((mode & P9_DMSETUID) == P9_DMSETUID) 92 res |= S_ISUID; 93 94 if ((mode & P9_DMSETGID) == P9_DMSETGID) 95 res |= S_ISGID; 96 97 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 98 res |= S_ISVTX; 99 } 100 return res; 101 } 102 103 /** 104 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 105 * @v9ses: v9fs session information 106 * @stat: p9_wstat from which mode need to be derived 107 * @rdev: major number, minor number in case of device files. 108 * 109 */ 110 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 111 struct p9_wstat *stat, dev_t *rdev) 112 { 113 int res; 114 u32 mode = stat->mode; 115 116 *rdev = 0; 117 res = p9mode2perm(v9ses, stat); 118 119 if ((mode & P9_DMDIR) == P9_DMDIR) 120 res |= S_IFDIR; 121 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 122 res |= S_IFLNK; 123 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 124 && (v9ses->nodev == 0)) 125 res |= S_IFSOCK; 126 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 127 && (v9ses->nodev == 0)) 128 res |= S_IFIFO; 129 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 130 && (v9ses->nodev == 0)) { 131 char type = 0, ext[32]; 132 int major = -1, minor = -1; 133 134 strlcpy(ext, stat->extension, sizeof(ext)); 135 sscanf(ext, "%c %i %i", &type, &major, &minor); 136 switch (type) { 137 case 'c': 138 res |= S_IFCHR; 139 break; 140 case 'b': 141 res |= S_IFBLK; 142 break; 143 default: 144 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 145 type, stat->extension); 146 } 147 *rdev = MKDEV(major, minor); 148 } else 149 res |= S_IFREG; 150 151 return res; 152 } 153 154 /** 155 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 156 * @uflags: flags to convert 157 * @extended: if .u extensions are active 158 */ 159 160 int v9fs_uflags2omode(int uflags, int extended) 161 { 162 int ret; 163 164 ret = 0; 165 switch (uflags&3) { 166 default: 167 case O_RDONLY: 168 ret = P9_OREAD; 169 break; 170 171 case O_WRONLY: 172 ret = P9_OWRITE; 173 break; 174 175 case O_RDWR: 176 ret = P9_ORDWR; 177 break; 178 } 179 180 if (extended) { 181 if (uflags & O_EXCL) 182 ret |= P9_OEXCL; 183 184 if (uflags & O_APPEND) 185 ret |= P9_OAPPEND; 186 } 187 188 return ret; 189 } 190 191 /** 192 * v9fs_blank_wstat - helper function to setup a 9P stat structure 193 * @wstat: structure to initialize 194 * 195 */ 196 197 void 198 v9fs_blank_wstat(struct p9_wstat *wstat) 199 { 200 wstat->type = ~0; 201 wstat->dev = ~0; 202 wstat->qid.type = ~0; 203 wstat->qid.version = ~0; 204 *((long long *)&wstat->qid.path) = ~0; 205 wstat->mode = ~0; 206 wstat->atime = ~0; 207 wstat->mtime = ~0; 208 wstat->length = ~0; 209 wstat->name = NULL; 210 wstat->uid = NULL; 211 wstat->gid = NULL; 212 wstat->muid = NULL; 213 wstat->n_uid = INVALID_UID; 214 wstat->n_gid = INVALID_GID; 215 wstat->n_muid = INVALID_UID; 216 wstat->extension = NULL; 217 } 218 219 /** 220 * v9fs_alloc_inode - helper function to allocate an inode 221 * 222 */ 223 struct inode *v9fs_alloc_inode(struct super_block *sb) 224 { 225 struct v9fs_inode *v9inode; 226 v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL); 227 if (!v9inode) 228 return NULL; 229 #ifdef CONFIG_9P_FSCACHE 230 v9inode->fscache = NULL; 231 mutex_init(&v9inode->fscache_lock); 232 #endif 233 v9inode->writeback_fid = NULL; 234 v9inode->cache_validity = 0; 235 mutex_init(&v9inode->v_mutex); 236 return &v9inode->vfs_inode; 237 } 238 239 /** 240 * v9fs_free_inode - destroy an inode 241 * 242 */ 243 244 void v9fs_free_inode(struct inode *inode) 245 { 246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 247 } 248 249 int v9fs_init_inode(struct v9fs_session_info *v9ses, 250 struct inode *inode, umode_t mode, dev_t rdev) 251 { 252 int err = 0; 253 254 inode_init_owner(&init_user_ns,inode, NULL, mode); 255 inode->i_blocks = 0; 256 inode->i_rdev = rdev; 257 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 258 inode->i_mapping->a_ops = &v9fs_addr_operations; 259 inode->i_private = NULL; 260 261 switch (mode & S_IFMT) { 262 case S_IFIFO: 263 case S_IFBLK: 264 case S_IFCHR: 265 case S_IFSOCK: 266 if (v9fs_proto_dotl(v9ses)) { 267 inode->i_op = &v9fs_file_inode_operations_dotl; 268 } else if (v9fs_proto_dotu(v9ses)) { 269 inode->i_op = &v9fs_file_inode_operations; 270 } else { 271 p9_debug(P9_DEBUG_ERROR, 272 "special files without extended mode\n"); 273 err = -EINVAL; 274 goto error; 275 } 276 init_special_inode(inode, inode->i_mode, inode->i_rdev); 277 break; 278 case S_IFREG: 279 if (v9fs_proto_dotl(v9ses)) { 280 inode->i_op = &v9fs_file_inode_operations_dotl; 281 if (v9ses->cache == CACHE_LOOSE || 282 v9ses->cache == CACHE_FSCACHE) 283 inode->i_fop = 284 &v9fs_cached_file_operations_dotl; 285 else if (v9ses->cache == CACHE_MMAP) 286 inode->i_fop = &v9fs_mmap_file_operations_dotl; 287 else 288 inode->i_fop = &v9fs_file_operations_dotl; 289 } else { 290 inode->i_op = &v9fs_file_inode_operations; 291 if (v9ses->cache == CACHE_LOOSE || 292 v9ses->cache == CACHE_FSCACHE) 293 inode->i_fop = 294 &v9fs_cached_file_operations; 295 else if (v9ses->cache == CACHE_MMAP) 296 inode->i_fop = &v9fs_mmap_file_operations; 297 else 298 inode->i_fop = &v9fs_file_operations; 299 } 300 301 break; 302 case S_IFLNK: 303 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 304 p9_debug(P9_DEBUG_ERROR, 305 "extended modes used with legacy protocol\n"); 306 err = -EINVAL; 307 goto error; 308 } 309 310 if (v9fs_proto_dotl(v9ses)) 311 inode->i_op = &v9fs_symlink_inode_operations_dotl; 312 else 313 inode->i_op = &v9fs_symlink_inode_operations; 314 315 break; 316 case S_IFDIR: 317 inc_nlink(inode); 318 if (v9fs_proto_dotl(v9ses)) 319 inode->i_op = &v9fs_dir_inode_operations_dotl; 320 else if (v9fs_proto_dotu(v9ses)) 321 inode->i_op = &v9fs_dir_inode_operations_dotu; 322 else 323 inode->i_op = &v9fs_dir_inode_operations; 324 325 if (v9fs_proto_dotl(v9ses)) 326 inode->i_fop = &v9fs_dir_operations_dotl; 327 else 328 inode->i_fop = &v9fs_dir_operations; 329 330 break; 331 default: 332 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 333 mode, mode & S_IFMT); 334 err = -EINVAL; 335 goto error; 336 } 337 error: 338 return err; 339 340 } 341 342 /** 343 * v9fs_get_inode - helper function to setup an inode 344 * @sb: superblock 345 * @mode: mode to setup inode with 346 * 347 */ 348 349 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 350 { 351 int err; 352 struct inode *inode; 353 struct v9fs_session_info *v9ses = sb->s_fs_info; 354 355 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 356 357 inode = new_inode(sb); 358 if (!inode) { 359 pr_warn("%s (%d): Problem allocating inode\n", 360 __func__, task_pid_nr(current)); 361 return ERR_PTR(-ENOMEM); 362 } 363 err = v9fs_init_inode(v9ses, inode, mode, rdev); 364 if (err) { 365 iput(inode); 366 return ERR_PTR(err); 367 } 368 return inode; 369 } 370 371 /** 372 * v9fs_clear_inode - release an inode 373 * @inode: inode to release 374 * 375 */ 376 void v9fs_evict_inode(struct inode *inode) 377 { 378 struct v9fs_inode *v9inode = V9FS_I(inode); 379 380 truncate_inode_pages_final(&inode->i_data); 381 clear_inode(inode); 382 filemap_fdatawrite(&inode->i_data); 383 384 v9fs_cache_inode_put_cookie(inode); 385 /* clunk the fid stashed in writeback_fid */ 386 if (v9inode->writeback_fid) { 387 p9_client_clunk(v9inode->writeback_fid); 388 v9inode->writeback_fid = NULL; 389 } 390 } 391 392 static int v9fs_test_inode(struct inode *inode, void *data) 393 { 394 int umode; 395 dev_t rdev; 396 struct v9fs_inode *v9inode = V9FS_I(inode); 397 struct p9_wstat *st = (struct p9_wstat *)data; 398 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 399 400 umode = p9mode2unixmode(v9ses, st, &rdev); 401 /* don't match inode of different type */ 402 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 403 return 0; 404 405 /* compare qid details */ 406 if (memcmp(&v9inode->qid.version, 407 &st->qid.version, sizeof(v9inode->qid.version))) 408 return 0; 409 410 if (v9inode->qid.type != st->qid.type) 411 return 0; 412 413 if (v9inode->qid.path != st->qid.path) 414 return 0; 415 return 1; 416 } 417 418 static int v9fs_test_new_inode(struct inode *inode, void *data) 419 { 420 return 0; 421 } 422 423 static int v9fs_set_inode(struct inode *inode, void *data) 424 { 425 struct v9fs_inode *v9inode = V9FS_I(inode); 426 struct p9_wstat *st = (struct p9_wstat *)data; 427 428 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 429 return 0; 430 } 431 432 static struct inode *v9fs_qid_iget(struct super_block *sb, 433 struct p9_qid *qid, 434 struct p9_wstat *st, 435 int new) 436 { 437 dev_t rdev; 438 int retval; 439 umode_t umode; 440 unsigned long i_ino; 441 struct inode *inode; 442 struct v9fs_session_info *v9ses = sb->s_fs_info; 443 int (*test)(struct inode *, void *); 444 445 if (new) 446 test = v9fs_test_new_inode; 447 else 448 test = v9fs_test_inode; 449 450 i_ino = v9fs_qid2ino(qid); 451 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 452 if (!inode) 453 return ERR_PTR(-ENOMEM); 454 if (!(inode->i_state & I_NEW)) 455 return inode; 456 /* 457 * initialize the inode with the stat info 458 * FIXME!! we may need support for stale inodes 459 * later. 460 */ 461 inode->i_ino = i_ino; 462 umode = p9mode2unixmode(v9ses, st, &rdev); 463 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 464 if (retval) 465 goto error; 466 467 v9fs_stat2inode(st, inode, sb, 0); 468 v9fs_cache_inode_get_cookie(inode); 469 unlock_new_inode(inode); 470 return inode; 471 error: 472 iget_failed(inode); 473 return ERR_PTR(retval); 474 475 } 476 477 struct inode * 478 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 479 struct super_block *sb, int new) 480 { 481 struct p9_wstat *st; 482 struct inode *inode = NULL; 483 484 st = p9_client_stat(fid); 485 if (IS_ERR(st)) 486 return ERR_CAST(st); 487 488 inode = v9fs_qid_iget(sb, &st->qid, st, new); 489 p9stat_free(st); 490 kfree(st); 491 return inode; 492 } 493 494 /** 495 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 496 * plan 9 AT flag. 497 * @flags: flags to convert 498 */ 499 static int v9fs_at_to_dotl_flags(int flags) 500 { 501 int rflags = 0; 502 if (flags & AT_REMOVEDIR) 503 rflags |= P9_DOTL_AT_REMOVEDIR; 504 return rflags; 505 } 506 507 /** 508 * v9fs_dec_count - helper functon to drop i_nlink. 509 * 510 * If a directory had nlink <= 2 (including . and ..), then we should not drop 511 * the link count, which indicates the underlying exported fs doesn't maintain 512 * nlink accurately. e.g. 513 * - overlayfs sets nlink to 1 for merged dir 514 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 515 * than EXT4_LINK_MAX (65000) links. 516 * 517 * @inode: inode whose nlink is being dropped 518 */ 519 static void v9fs_dec_count(struct inode *inode) 520 { 521 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 522 drop_nlink(inode); 523 } 524 525 /** 526 * v9fs_remove - helper function to remove files and directories 527 * @dir: directory inode that is being deleted 528 * @dentry: dentry that is being deleted 529 * @flags: removing a directory 530 * 531 */ 532 533 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 534 { 535 struct inode *inode; 536 int retval = -EOPNOTSUPP; 537 struct p9_fid *v9fid, *dfid; 538 struct v9fs_session_info *v9ses; 539 540 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 541 dir, dentry, flags); 542 543 v9ses = v9fs_inode2v9ses(dir); 544 inode = d_inode(dentry); 545 dfid = v9fs_parent_fid(dentry); 546 if (IS_ERR(dfid)) { 547 retval = PTR_ERR(dfid); 548 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 549 return retval; 550 } 551 if (v9fs_proto_dotl(v9ses)) 552 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 553 v9fs_at_to_dotl_flags(flags)); 554 p9_client_clunk(dfid); 555 if (retval == -EOPNOTSUPP) { 556 /* Try the one based on path */ 557 v9fid = v9fs_fid_clone(dentry); 558 if (IS_ERR(v9fid)) 559 return PTR_ERR(v9fid); 560 retval = p9_client_remove(v9fid); 561 } 562 if (!retval) { 563 /* 564 * directories on unlink should have zero 565 * link count 566 */ 567 if (flags & AT_REMOVEDIR) { 568 clear_nlink(inode); 569 v9fs_dec_count(dir); 570 } else 571 v9fs_dec_count(inode); 572 573 v9fs_invalidate_inode_attr(inode); 574 v9fs_invalidate_inode_attr(dir); 575 576 /* invalidate all fids associated with dentry */ 577 /* NOTE: This will not include open fids */ 578 dentry->d_op->d_release(dentry); 579 } 580 return retval; 581 } 582 583 /** 584 * v9fs_create - Create a file 585 * @v9ses: session information 586 * @dir: directory that dentry is being created in 587 * @dentry: dentry that is being created 588 * @extension: 9p2000.u extension string to support devices, etc. 589 * @perm: create permissions 590 * @mode: open mode 591 * 592 */ 593 static struct p9_fid * 594 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 595 struct dentry *dentry, char *extension, u32 perm, u8 mode) 596 { 597 int err; 598 const unsigned char *name; 599 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 600 struct inode *inode; 601 602 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 603 604 err = 0; 605 name = dentry->d_name.name; 606 dfid = v9fs_parent_fid(dentry); 607 if (IS_ERR(dfid)) { 608 err = PTR_ERR(dfid); 609 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 610 return ERR_PTR(err); 611 } 612 613 /* clone a fid to use for creation */ 614 ofid = clone_fid(dfid); 615 if (IS_ERR(ofid)) { 616 err = PTR_ERR(ofid); 617 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 618 p9_client_clunk(dfid); 619 return ERR_PTR(err); 620 } 621 622 err = p9_client_fcreate(ofid, name, perm, mode, extension); 623 if (err < 0) { 624 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 625 p9_client_clunk(dfid); 626 goto error; 627 } 628 629 if (!(perm & P9_DMLINK)) { 630 /* now walk from the parent so we can get unopened fid */ 631 fid = p9_client_walk(dfid, 1, &name, 1); 632 if (IS_ERR(fid)) { 633 err = PTR_ERR(fid); 634 p9_debug(P9_DEBUG_VFS, 635 "p9_client_walk failed %d\n", err); 636 fid = NULL; 637 p9_client_clunk(dfid); 638 goto error; 639 } 640 /* 641 * instantiate inode and assign the unopened fid to the dentry 642 */ 643 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 644 if (IS_ERR(inode)) { 645 err = PTR_ERR(inode); 646 p9_debug(P9_DEBUG_VFS, 647 "inode creation failed %d\n", err); 648 p9_client_clunk(dfid); 649 goto error; 650 } 651 v9fs_fid_add(dentry, fid); 652 d_instantiate(dentry, inode); 653 } 654 p9_client_clunk(dfid); 655 return ofid; 656 error: 657 if (ofid) 658 p9_client_clunk(ofid); 659 660 if (fid) 661 p9_client_clunk(fid); 662 663 return ERR_PTR(err); 664 } 665 666 /** 667 * v9fs_vfs_create - VFS hook to create a regular file 668 * 669 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 670 * for mknod(2). 671 * 672 * @dir: directory inode that is being created 673 * @dentry: dentry that is being deleted 674 * @mode: create permissions 675 * 676 */ 677 678 static int 679 v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, 680 struct dentry *dentry, umode_t mode, bool excl) 681 { 682 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 683 u32 perm = unixmode2p9mode(v9ses, mode); 684 struct p9_fid *fid; 685 686 /* P9_OEXCL? */ 687 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 688 if (IS_ERR(fid)) 689 return PTR_ERR(fid); 690 691 v9fs_invalidate_inode_attr(dir); 692 p9_client_clunk(fid); 693 694 return 0; 695 } 696 697 /** 698 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 699 * @dir: inode that is being unlinked 700 * @dentry: dentry that is being unlinked 701 * @mode: mode for new directory 702 * 703 */ 704 705 static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 706 struct dentry *dentry, umode_t mode) 707 { 708 int err; 709 u32 perm; 710 struct p9_fid *fid; 711 struct v9fs_session_info *v9ses; 712 713 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 714 err = 0; 715 v9ses = v9fs_inode2v9ses(dir); 716 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 717 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 718 if (IS_ERR(fid)) { 719 err = PTR_ERR(fid); 720 fid = NULL; 721 } else { 722 inc_nlink(dir); 723 v9fs_invalidate_inode_attr(dir); 724 } 725 726 if (fid) 727 p9_client_clunk(fid); 728 729 return err; 730 } 731 732 /** 733 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 734 * @dir: inode that is being walked from 735 * @dentry: dentry that is being walked to? 736 * @flags: lookup flags (unused) 737 * 738 */ 739 740 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 741 unsigned int flags) 742 { 743 struct dentry *res; 744 struct v9fs_session_info *v9ses; 745 struct p9_fid *dfid, *fid; 746 struct inode *inode; 747 const unsigned char *name; 748 749 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 750 dir, dentry, dentry, flags); 751 752 if (dentry->d_name.len > NAME_MAX) 753 return ERR_PTR(-ENAMETOOLONG); 754 755 v9ses = v9fs_inode2v9ses(dir); 756 /* We can walk d_parent because we hold the dir->i_mutex */ 757 dfid = v9fs_parent_fid(dentry); 758 if (IS_ERR(dfid)) 759 return ERR_CAST(dfid); 760 761 /* 762 * Make sure we don't use a wrong inode due to parallel 763 * unlink. For cached mode create calls request for new 764 * inode. But with cache disabled, lookup should do this. 765 */ 766 name = dentry->d_name.name; 767 fid = p9_client_walk(dfid, 1, &name, 1); 768 p9_client_clunk(dfid); 769 if (fid == ERR_PTR(-ENOENT)) 770 inode = NULL; 771 else if (IS_ERR(fid)) 772 inode = ERR_CAST(fid); 773 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 774 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 775 else 776 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 777 /* 778 * If we had a rename on the server and a parallel lookup 779 * for the new name, then make sure we instantiate with 780 * the new name. ie look up for a/b, while on server somebody 781 * moved b under k and client parallely did a lookup for 782 * k/b. 783 */ 784 res = d_splice_alias(inode, dentry); 785 if (!IS_ERR(fid)) { 786 if (!res) 787 v9fs_fid_add(dentry, fid); 788 else if (!IS_ERR(res)) 789 v9fs_fid_add(res, fid); 790 else 791 p9_client_clunk(fid); 792 } 793 return res; 794 } 795 796 static int 797 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 798 struct file *file, unsigned flags, umode_t mode) 799 { 800 int err; 801 u32 perm; 802 struct v9fs_inode *v9inode; 803 struct v9fs_session_info *v9ses; 804 struct p9_fid *fid, *inode_fid; 805 struct dentry *res = NULL; 806 struct inode *inode; 807 808 if (d_in_lookup(dentry)) { 809 res = v9fs_vfs_lookup(dir, dentry, 0); 810 if (IS_ERR(res)) 811 return PTR_ERR(res); 812 813 if (res) 814 dentry = res; 815 } 816 817 /* Only creates */ 818 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 819 return finish_no_open(file, res); 820 821 err = 0; 822 823 v9ses = v9fs_inode2v9ses(dir); 824 perm = unixmode2p9mode(v9ses, mode); 825 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 826 v9fs_uflags2omode(flags, 827 v9fs_proto_dotu(v9ses))); 828 if (IS_ERR(fid)) { 829 err = PTR_ERR(fid); 830 fid = NULL; 831 goto error; 832 } 833 834 v9fs_invalidate_inode_attr(dir); 835 inode = d_inode(dentry); 836 v9inode = V9FS_I(inode); 837 mutex_lock(&v9inode->v_mutex); 838 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 839 !v9inode->writeback_fid && 840 ((flags & O_ACCMODE) != O_RDONLY)) { 841 /* 842 * clone a fid and add it to writeback_fid 843 * we do it during open time instead of 844 * page dirty time via write_begin/page_mkwrite 845 * because we want write after unlink usecase 846 * to work. 847 */ 848 inode_fid = v9fs_writeback_fid(dentry); 849 if (IS_ERR(inode_fid)) { 850 err = PTR_ERR(inode_fid); 851 mutex_unlock(&v9inode->v_mutex); 852 goto error; 853 } 854 v9inode->writeback_fid = (void *) inode_fid; 855 } 856 mutex_unlock(&v9inode->v_mutex); 857 err = finish_open(file, dentry, generic_file_open); 858 if (err) 859 goto error; 860 861 file->private_data = fid; 862 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 863 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 864 v9fs_open_fid_add(inode, fid); 865 866 file->f_mode |= FMODE_CREATED; 867 out: 868 dput(res); 869 return err; 870 871 error: 872 if (fid) 873 p9_client_clunk(fid); 874 goto out; 875 } 876 877 /** 878 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 879 * @i: inode that is being unlinked 880 * @d: dentry that is being unlinked 881 * 882 */ 883 884 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 885 { 886 return v9fs_remove(i, d, 0); 887 } 888 889 /** 890 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 891 * @i: inode that is being unlinked 892 * @d: dentry that is being unlinked 893 * 894 */ 895 896 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 897 { 898 return v9fs_remove(i, d, AT_REMOVEDIR); 899 } 900 901 /** 902 * v9fs_vfs_rename - VFS hook to rename an inode 903 * @old_dir: old dir inode 904 * @old_dentry: old dentry 905 * @new_dir: new dir inode 906 * @new_dentry: new dentry 907 * 908 */ 909 910 int 911 v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 912 struct dentry *old_dentry, struct inode *new_dir, 913 struct dentry *new_dentry, unsigned int flags) 914 { 915 int retval; 916 struct inode *old_inode; 917 struct inode *new_inode; 918 struct v9fs_session_info *v9ses; 919 struct p9_fid *oldfid, *dfid; 920 struct p9_fid *olddirfid; 921 struct p9_fid *newdirfid; 922 struct p9_wstat wstat; 923 924 if (flags) 925 return -EINVAL; 926 927 p9_debug(P9_DEBUG_VFS, "\n"); 928 retval = 0; 929 old_inode = d_inode(old_dentry); 930 new_inode = d_inode(new_dentry); 931 v9ses = v9fs_inode2v9ses(old_inode); 932 oldfid = v9fs_fid_lookup(old_dentry); 933 if (IS_ERR(oldfid)) 934 return PTR_ERR(oldfid); 935 936 dfid = v9fs_parent_fid(old_dentry); 937 olddirfid = clone_fid(dfid); 938 if (dfid && !IS_ERR(dfid)) 939 p9_client_clunk(dfid); 940 941 if (IS_ERR(olddirfid)) { 942 retval = PTR_ERR(olddirfid); 943 goto done; 944 } 945 946 dfid = v9fs_parent_fid(new_dentry); 947 newdirfid = clone_fid(dfid); 948 p9_client_clunk(dfid); 949 950 if (IS_ERR(newdirfid)) { 951 retval = PTR_ERR(newdirfid); 952 goto clunk_olddir; 953 } 954 955 down_write(&v9ses->rename_sem); 956 if (v9fs_proto_dotl(v9ses)) { 957 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 958 newdirfid, new_dentry->d_name.name); 959 if (retval == -EOPNOTSUPP) 960 retval = p9_client_rename(oldfid, newdirfid, 961 new_dentry->d_name.name); 962 if (retval != -EOPNOTSUPP) 963 goto clunk_newdir; 964 } 965 if (old_dentry->d_parent != new_dentry->d_parent) { 966 /* 967 * 9P .u can only handle file rename in the same directory 968 */ 969 970 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 971 retval = -EXDEV; 972 goto clunk_newdir; 973 } 974 v9fs_blank_wstat(&wstat); 975 wstat.muid = v9ses->uname; 976 wstat.name = new_dentry->d_name.name; 977 retval = p9_client_wstat(oldfid, &wstat); 978 979 clunk_newdir: 980 if (!retval) { 981 if (new_inode) { 982 if (S_ISDIR(new_inode->i_mode)) 983 clear_nlink(new_inode); 984 else 985 v9fs_dec_count(new_inode); 986 } 987 if (S_ISDIR(old_inode->i_mode)) { 988 if (!new_inode) 989 inc_nlink(new_dir); 990 v9fs_dec_count(old_dir); 991 } 992 v9fs_invalidate_inode_attr(old_inode); 993 v9fs_invalidate_inode_attr(old_dir); 994 v9fs_invalidate_inode_attr(new_dir); 995 996 /* successful rename */ 997 d_move(old_dentry, new_dentry); 998 } 999 up_write(&v9ses->rename_sem); 1000 p9_client_clunk(newdirfid); 1001 1002 clunk_olddir: 1003 p9_client_clunk(olddirfid); 1004 1005 done: 1006 p9_client_clunk(oldfid); 1007 return retval; 1008 } 1009 1010 /** 1011 * v9fs_vfs_getattr - retrieve file metadata 1012 * @path: Object to query 1013 * @stat: metadata structure to populate 1014 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1015 * @flags: AT_STATX_xxx setting 1016 * 1017 */ 1018 1019 static int 1020 v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 1021 struct kstat *stat, u32 request_mask, unsigned int flags) 1022 { 1023 struct dentry *dentry = path->dentry; 1024 struct v9fs_session_info *v9ses; 1025 struct p9_fid *fid; 1026 struct p9_wstat *st; 1027 1028 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1029 v9ses = v9fs_dentry2v9ses(dentry); 1030 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1031 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1032 return 0; 1033 } 1034 fid = v9fs_fid_lookup(dentry); 1035 if (IS_ERR(fid)) 1036 return PTR_ERR(fid); 1037 1038 st = p9_client_stat(fid); 1039 p9_client_clunk(fid); 1040 if (IS_ERR(st)) 1041 return PTR_ERR(st); 1042 1043 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1044 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1045 1046 p9stat_free(st); 1047 kfree(st); 1048 return 0; 1049 } 1050 1051 /** 1052 * v9fs_vfs_setattr - set file metadata 1053 * @dentry: file whose metadata to set 1054 * @iattr: metadata assignment structure 1055 * 1056 */ 1057 1058 static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, 1059 struct dentry *dentry, struct iattr *iattr) 1060 { 1061 int retval, use_dentry = 0; 1062 struct v9fs_session_info *v9ses; 1063 struct p9_fid *fid = NULL; 1064 struct p9_wstat wstat; 1065 1066 p9_debug(P9_DEBUG_VFS, "\n"); 1067 retval = setattr_prepare(&init_user_ns, dentry, iattr); 1068 if (retval) 1069 return retval; 1070 1071 retval = -EPERM; 1072 v9ses = v9fs_dentry2v9ses(dentry); 1073 if (iattr->ia_valid & ATTR_FILE) { 1074 fid = iattr->ia_file->private_data; 1075 WARN_ON(!fid); 1076 } 1077 if (!fid) { 1078 fid = v9fs_fid_lookup(dentry); 1079 use_dentry = 1; 1080 } 1081 if(IS_ERR(fid)) 1082 return PTR_ERR(fid); 1083 1084 v9fs_blank_wstat(&wstat); 1085 if (iattr->ia_valid & ATTR_MODE) 1086 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1087 1088 if (iattr->ia_valid & ATTR_MTIME) 1089 wstat.mtime = iattr->ia_mtime.tv_sec; 1090 1091 if (iattr->ia_valid & ATTR_ATIME) 1092 wstat.atime = iattr->ia_atime.tv_sec; 1093 1094 if (iattr->ia_valid & ATTR_SIZE) 1095 wstat.length = iattr->ia_size; 1096 1097 if (v9fs_proto_dotu(v9ses)) { 1098 if (iattr->ia_valid & ATTR_UID) 1099 wstat.n_uid = iattr->ia_uid; 1100 1101 if (iattr->ia_valid & ATTR_GID) 1102 wstat.n_gid = iattr->ia_gid; 1103 } 1104 1105 /* Write all dirty data */ 1106 if (d_is_reg(dentry)) 1107 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1108 1109 retval = p9_client_wstat(fid, &wstat); 1110 1111 if (use_dentry) 1112 p9_client_clunk(fid); 1113 1114 if (retval < 0) 1115 return retval; 1116 1117 if ((iattr->ia_valid & ATTR_SIZE) && 1118 iattr->ia_size != i_size_read(d_inode(dentry))) 1119 truncate_setsize(d_inode(dentry), iattr->ia_size); 1120 1121 v9fs_invalidate_inode_attr(d_inode(dentry)); 1122 1123 setattr_copy(&init_user_ns, d_inode(dentry), iattr); 1124 mark_inode_dirty(d_inode(dentry)); 1125 return 0; 1126 } 1127 1128 /** 1129 * v9fs_stat2inode - populate an inode structure with mistat info 1130 * @stat: Plan 9 metadata (mistat) structure 1131 * @inode: inode to populate 1132 * @sb: superblock of filesystem 1133 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1134 * 1135 */ 1136 1137 void 1138 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1139 struct super_block *sb, unsigned int flags) 1140 { 1141 umode_t mode; 1142 struct v9fs_session_info *v9ses = sb->s_fs_info; 1143 struct v9fs_inode *v9inode = V9FS_I(inode); 1144 1145 set_nlink(inode, 1); 1146 1147 inode->i_atime.tv_sec = stat->atime; 1148 inode->i_mtime.tv_sec = stat->mtime; 1149 inode->i_ctime.tv_sec = stat->mtime; 1150 1151 inode->i_uid = v9ses->dfltuid; 1152 inode->i_gid = v9ses->dfltgid; 1153 1154 if (v9fs_proto_dotu(v9ses)) { 1155 inode->i_uid = stat->n_uid; 1156 inode->i_gid = stat->n_gid; 1157 } 1158 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1159 if (v9fs_proto_dotu(v9ses)) { 1160 unsigned int i_nlink; 1161 /* 1162 * Hadlink support got added later to the .u extension. 1163 * So there can be a server out there that doesn't 1164 * support this even with .u extension. That would 1165 * just leave us with stat->extension being an empty 1166 * string, though. 1167 */ 1168 /* HARDLINKCOUNT %u */ 1169 if (sscanf(stat->extension, 1170 " HARDLINKCOUNT %u", &i_nlink) == 1) 1171 set_nlink(inode, i_nlink); 1172 } 1173 } 1174 mode = p9mode2perm(v9ses, stat); 1175 mode |= inode->i_mode & ~S_IALLUGO; 1176 inode->i_mode = mode; 1177 1178 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1179 v9fs_i_size_write(inode, stat->length); 1180 /* not real number of blocks, but 512 byte ones ... */ 1181 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1182 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1183 } 1184 1185 /** 1186 * v9fs_qid2ino - convert qid into inode number 1187 * @qid: qid to hash 1188 * 1189 * BUG: potential for inode number collisions? 1190 */ 1191 1192 ino_t v9fs_qid2ino(struct p9_qid *qid) 1193 { 1194 u64 path = qid->path + 2; 1195 ino_t i = 0; 1196 1197 if (sizeof(ino_t) == sizeof(path)) 1198 memcpy(&i, &path, sizeof(ino_t)); 1199 else 1200 i = (ino_t) (path ^ (path >> 32)); 1201 1202 return i; 1203 } 1204 1205 /** 1206 * v9fs_vfs_get_link - follow a symlink path 1207 * @dentry: dentry for symlink 1208 * @inode: inode for symlink 1209 * @done: delayed call for when we are done with the return value 1210 */ 1211 1212 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1213 struct inode *inode, 1214 struct delayed_call *done) 1215 { 1216 struct v9fs_session_info *v9ses; 1217 struct p9_fid *fid; 1218 struct p9_wstat *st; 1219 char *res; 1220 1221 if (!dentry) 1222 return ERR_PTR(-ECHILD); 1223 1224 v9ses = v9fs_dentry2v9ses(dentry); 1225 fid = v9fs_fid_lookup(dentry); 1226 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1227 1228 if (IS_ERR(fid)) 1229 return ERR_CAST(fid); 1230 1231 if (!v9fs_proto_dotu(v9ses)) 1232 return ERR_PTR(-EBADF); 1233 1234 st = p9_client_stat(fid); 1235 p9_client_clunk(fid); 1236 if (IS_ERR(st)) 1237 return ERR_CAST(st); 1238 1239 if (!(st->mode & P9_DMSYMLINK)) { 1240 p9stat_free(st); 1241 kfree(st); 1242 return ERR_PTR(-EINVAL); 1243 } 1244 res = st->extension; 1245 st->extension = NULL; 1246 if (strlen(res) >= PATH_MAX) 1247 res[PATH_MAX - 1] = '\0'; 1248 1249 p9stat_free(st); 1250 kfree(st); 1251 set_delayed_call(done, kfree_link, res); 1252 return res; 1253 } 1254 1255 /** 1256 * v9fs_vfs_mkspecial - create a special file 1257 * @dir: inode to create special file in 1258 * @dentry: dentry to create 1259 * @perm: mode to create special file 1260 * @extension: 9p2000.u format extension string representing special file 1261 * 1262 */ 1263 1264 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1265 u32 perm, const char *extension) 1266 { 1267 struct p9_fid *fid; 1268 struct v9fs_session_info *v9ses; 1269 1270 v9ses = v9fs_inode2v9ses(dir); 1271 if (!v9fs_proto_dotu(v9ses)) { 1272 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1273 return -EPERM; 1274 } 1275 1276 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1277 P9_OREAD); 1278 if (IS_ERR(fid)) 1279 return PTR_ERR(fid); 1280 1281 v9fs_invalidate_inode_attr(dir); 1282 p9_client_clunk(fid); 1283 return 0; 1284 } 1285 1286 /** 1287 * v9fs_vfs_symlink - helper function to create symlinks 1288 * @dir: directory inode containing symlink 1289 * @dentry: dentry for symlink 1290 * @symname: symlink data 1291 * 1292 * See Also: 9P2000.u RFC for more information 1293 * 1294 */ 1295 1296 static int 1297 v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1298 struct dentry *dentry, const char *symname) 1299 { 1300 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1301 dir->i_ino, dentry, symname); 1302 1303 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1304 } 1305 1306 #define U32_MAX_DIGITS 10 1307 1308 /** 1309 * v9fs_vfs_link - create a hardlink 1310 * @old_dentry: dentry for file to link to 1311 * @dir: inode destination for new link 1312 * @dentry: dentry for link 1313 * 1314 */ 1315 1316 static int 1317 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1318 struct dentry *dentry) 1319 { 1320 int retval; 1321 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1322 struct p9_fid *oldfid; 1323 1324 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1325 dir->i_ino, dentry, old_dentry); 1326 1327 oldfid = v9fs_fid_clone(old_dentry); 1328 if (IS_ERR(oldfid)) 1329 return PTR_ERR(oldfid); 1330 1331 sprintf(name, "%d\n", oldfid->fid); 1332 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1333 if (!retval) { 1334 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1335 v9fs_invalidate_inode_attr(dir); 1336 } 1337 p9_client_clunk(oldfid); 1338 return retval; 1339 } 1340 1341 /** 1342 * v9fs_vfs_mknod - create a special file 1343 * @dir: inode destination for new link 1344 * @dentry: dentry for file 1345 * @mode: mode for creation 1346 * @rdev: device associated with special file 1347 * 1348 */ 1349 1350 static int 1351 v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1352 struct dentry *dentry, umode_t mode, dev_t rdev) 1353 { 1354 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1355 int retval; 1356 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1357 u32 perm; 1358 1359 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1360 dir->i_ino, dentry, mode, 1361 MAJOR(rdev), MINOR(rdev)); 1362 1363 /* build extension */ 1364 if (S_ISBLK(mode)) 1365 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1366 else if (S_ISCHR(mode)) 1367 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1368 else 1369 *name = 0; 1370 1371 perm = unixmode2p9mode(v9ses, mode); 1372 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1373 1374 return retval; 1375 } 1376 1377 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1378 { 1379 int umode; 1380 dev_t rdev; 1381 struct p9_wstat *st; 1382 struct v9fs_session_info *v9ses; 1383 unsigned int flags; 1384 1385 v9ses = v9fs_inode2v9ses(inode); 1386 st = p9_client_stat(fid); 1387 if (IS_ERR(st)) 1388 return PTR_ERR(st); 1389 /* 1390 * Don't update inode if the file type is different 1391 */ 1392 umode = p9mode2unixmode(v9ses, st, &rdev); 1393 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1394 goto out; 1395 1396 /* 1397 * We don't want to refresh inode->i_size, 1398 * because we may have cached data 1399 */ 1400 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1401 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1402 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1403 out: 1404 p9stat_free(st); 1405 kfree(st); 1406 return 0; 1407 } 1408 1409 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1410 .create = v9fs_vfs_create, 1411 .lookup = v9fs_vfs_lookup, 1412 .atomic_open = v9fs_vfs_atomic_open, 1413 .symlink = v9fs_vfs_symlink, 1414 .link = v9fs_vfs_link, 1415 .unlink = v9fs_vfs_unlink, 1416 .mkdir = v9fs_vfs_mkdir, 1417 .rmdir = v9fs_vfs_rmdir, 1418 .mknod = v9fs_vfs_mknod, 1419 .rename = v9fs_vfs_rename, 1420 .getattr = v9fs_vfs_getattr, 1421 .setattr = v9fs_vfs_setattr, 1422 }; 1423 1424 static const struct inode_operations v9fs_dir_inode_operations = { 1425 .create = v9fs_vfs_create, 1426 .lookup = v9fs_vfs_lookup, 1427 .atomic_open = v9fs_vfs_atomic_open, 1428 .unlink = v9fs_vfs_unlink, 1429 .mkdir = v9fs_vfs_mkdir, 1430 .rmdir = v9fs_vfs_rmdir, 1431 .mknod = v9fs_vfs_mknod, 1432 .rename = v9fs_vfs_rename, 1433 .getattr = v9fs_vfs_getattr, 1434 .setattr = v9fs_vfs_setattr, 1435 }; 1436 1437 static const struct inode_operations v9fs_file_inode_operations = { 1438 .getattr = v9fs_vfs_getattr, 1439 .setattr = v9fs_vfs_setattr, 1440 }; 1441 1442 static const struct inode_operations v9fs_symlink_inode_operations = { 1443 .get_link = v9fs_vfs_get_link, 1444 .getattr = v9fs_vfs_getattr, 1445 .setattr = v9fs_vfs_setattr, 1446 }; 1447 1448