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 = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 227 GFP_KERNEL); 228 if (!v9inode) 229 return NULL; 230 #ifdef CONFIG_9P_FSCACHE 231 v9inode->fscache = NULL; 232 mutex_init(&v9inode->fscache_lock); 233 #endif 234 v9inode->writeback_fid = NULL; 235 v9inode->cache_validity = 0; 236 mutex_init(&v9inode->v_mutex); 237 return &v9inode->vfs_inode; 238 } 239 240 /** 241 * v9fs_free_inode - destroy an inode 242 * 243 */ 244 245 void v9fs_free_inode(struct inode *inode) 246 { 247 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 248 } 249 250 int v9fs_init_inode(struct v9fs_session_info *v9ses, 251 struct inode *inode, umode_t mode, dev_t rdev) 252 { 253 int err = 0; 254 255 inode_init_owner(inode, NULL, mode); 256 inode->i_blocks = 0; 257 inode->i_rdev = rdev; 258 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 259 inode->i_mapping->a_ops = &v9fs_addr_operations; 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 static struct v9fs_fid* 373 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 374 { 375 int err; 376 int nfid; 377 struct v9fs_fid *ret; 378 struct v9fs_fcall *fcall; 379 380 nfid = v9fs_get_idpool(&v9ses->fidpool); 381 if (nfid < 0) { 382 eprintk(KERN_WARNING, "no free fids available\n"); 383 return ERR_PTR(-ENOSPC); 384 } 385 386 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 387 &fcall); 388 389 if (err < 0) { 390 if (fcall && fcall->id == RWALK) 391 goto clunk_fid; 392 393 PRINT_FCALL_ERROR("walk error", fcall); 394 v9fs_put_idpool(nfid, &v9ses->fidpool); 395 goto error; 396 } 397 398 kfree(fcall); 399 fcall = NULL; 400 ret = v9fs_fid_create(v9ses, nfid); 401 if (!ret) { 402 err = -ENOMEM; 403 goto clunk_fid; 404 } 405 406 err = v9fs_fid_insert(ret, dentry); 407 if (err < 0) { 408 v9fs_fid_destroy(ret); 409 goto clunk_fid; 410 } 411 412 return ret; 413 414 clunk_fid: 415 v9fs_t_clunk(v9ses, nfid); 416 417 error: 418 kfree(fcall); 419 return ERR_PTR(err); 420 } 421 */ 422 423 424 /** 425 * v9fs_clear_inode - release an inode 426 * @inode: inode to release 427 * 428 */ 429 void v9fs_evict_inode(struct inode *inode) 430 { 431 struct v9fs_inode *v9inode = V9FS_I(inode); 432 433 truncate_inode_pages_final(&inode->i_data); 434 clear_inode(inode); 435 filemap_fdatawrite(&inode->i_data); 436 437 v9fs_cache_inode_put_cookie(inode); 438 /* clunk the fid stashed in writeback_fid */ 439 if (v9inode->writeback_fid) { 440 p9_client_clunk(v9inode->writeback_fid); 441 v9inode->writeback_fid = NULL; 442 } 443 } 444 445 static int v9fs_test_inode(struct inode *inode, void *data) 446 { 447 int umode; 448 dev_t rdev; 449 struct v9fs_inode *v9inode = V9FS_I(inode); 450 struct p9_wstat *st = (struct p9_wstat *)data; 451 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 452 453 umode = p9mode2unixmode(v9ses, st, &rdev); 454 /* don't match inode of different type */ 455 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 456 return 0; 457 458 /* compare qid details */ 459 if (memcmp(&v9inode->qid.version, 460 &st->qid.version, sizeof(v9inode->qid.version))) 461 return 0; 462 463 if (v9inode->qid.type != st->qid.type) 464 return 0; 465 466 if (v9inode->qid.path != st->qid.path) 467 return 0; 468 return 1; 469 } 470 471 static int v9fs_test_new_inode(struct inode *inode, void *data) 472 { 473 return 0; 474 } 475 476 static int v9fs_set_inode(struct inode *inode, void *data) 477 { 478 struct v9fs_inode *v9inode = V9FS_I(inode); 479 struct p9_wstat *st = (struct p9_wstat *)data; 480 481 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 482 return 0; 483 } 484 485 static struct inode *v9fs_qid_iget(struct super_block *sb, 486 struct p9_qid *qid, 487 struct p9_wstat *st, 488 int new) 489 { 490 dev_t rdev; 491 int retval; 492 umode_t umode; 493 unsigned long i_ino; 494 struct inode *inode; 495 struct v9fs_session_info *v9ses = sb->s_fs_info; 496 int (*test)(struct inode *, void *); 497 498 if (new) 499 test = v9fs_test_new_inode; 500 else 501 test = v9fs_test_inode; 502 503 i_ino = v9fs_qid2ino(qid); 504 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 505 if (!inode) 506 return ERR_PTR(-ENOMEM); 507 if (!(inode->i_state & I_NEW)) 508 return inode; 509 /* 510 * initialize the inode with the stat info 511 * FIXME!! we may need support for stale inodes 512 * later. 513 */ 514 inode->i_ino = i_ino; 515 umode = p9mode2unixmode(v9ses, st, &rdev); 516 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 517 if (retval) 518 goto error; 519 520 v9fs_stat2inode(st, inode, sb, 0); 521 v9fs_cache_inode_get_cookie(inode); 522 unlock_new_inode(inode); 523 return inode; 524 error: 525 iget_failed(inode); 526 return ERR_PTR(retval); 527 528 } 529 530 struct inode * 531 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 532 struct super_block *sb, int new) 533 { 534 struct p9_wstat *st; 535 struct inode *inode = NULL; 536 537 st = p9_client_stat(fid); 538 if (IS_ERR(st)) 539 return ERR_CAST(st); 540 541 inode = v9fs_qid_iget(sb, &st->qid, st, new); 542 p9stat_free(st); 543 kfree(st); 544 return inode; 545 } 546 547 /** 548 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 549 * plan 9 AT flag. 550 * @flags: flags to convert 551 */ 552 static int v9fs_at_to_dotl_flags(int flags) 553 { 554 int rflags = 0; 555 if (flags & AT_REMOVEDIR) 556 rflags |= P9_DOTL_AT_REMOVEDIR; 557 return rflags; 558 } 559 560 /** 561 * v9fs_dec_count - helper functon to drop i_nlink. 562 * 563 * If a directory had nlink <= 2 (including . and ..), then we should not drop 564 * the link count, which indicates the underlying exported fs doesn't maintain 565 * nlink accurately. e.g. 566 * - overlayfs sets nlink to 1 for merged dir 567 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 568 * than EXT4_LINK_MAX (65000) links. 569 * 570 * @inode: inode whose nlink is being dropped 571 */ 572 static void v9fs_dec_count(struct inode *inode) 573 { 574 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 575 drop_nlink(inode); 576 } 577 578 /** 579 * v9fs_remove - helper function to remove files and directories 580 * @dir: directory inode that is being deleted 581 * @dentry: dentry that is being deleted 582 * @flags: removing a directory 583 * 584 */ 585 586 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 587 { 588 struct inode *inode; 589 int retval = -EOPNOTSUPP; 590 struct p9_fid *v9fid, *dfid; 591 struct v9fs_session_info *v9ses; 592 593 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 594 dir, dentry, flags); 595 596 v9ses = v9fs_inode2v9ses(dir); 597 inode = d_inode(dentry); 598 dfid = v9fs_parent_fid(dentry); 599 if (IS_ERR(dfid)) { 600 retval = PTR_ERR(dfid); 601 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 602 return retval; 603 } 604 if (v9fs_proto_dotl(v9ses)) 605 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 606 v9fs_at_to_dotl_flags(flags)); 607 if (retval == -EOPNOTSUPP) { 608 /* Try the one based on path */ 609 v9fid = v9fs_fid_clone(dentry); 610 if (IS_ERR(v9fid)) 611 return PTR_ERR(v9fid); 612 retval = p9_client_remove(v9fid); 613 } 614 if (!retval) { 615 /* 616 * directories on unlink should have zero 617 * link count 618 */ 619 if (flags & AT_REMOVEDIR) { 620 clear_nlink(inode); 621 v9fs_dec_count(dir); 622 } else 623 v9fs_dec_count(inode); 624 625 v9fs_invalidate_inode_attr(inode); 626 v9fs_invalidate_inode_attr(dir); 627 } 628 return retval; 629 } 630 631 /** 632 * v9fs_create - Create a file 633 * @v9ses: session information 634 * @dir: directory that dentry is being created in 635 * @dentry: dentry that is being created 636 * @extension: 9p2000.u extension string to support devices, etc. 637 * @perm: create permissions 638 * @mode: open mode 639 * 640 */ 641 static struct p9_fid * 642 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 643 struct dentry *dentry, char *extension, u32 perm, u8 mode) 644 { 645 int err; 646 const unsigned char *name; 647 struct p9_fid *dfid, *ofid, *fid; 648 struct inode *inode; 649 650 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 651 652 err = 0; 653 ofid = NULL; 654 fid = NULL; 655 name = dentry->d_name.name; 656 dfid = v9fs_parent_fid(dentry); 657 if (IS_ERR(dfid)) { 658 err = PTR_ERR(dfid); 659 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 660 return ERR_PTR(err); 661 } 662 663 /* clone a fid to use for creation */ 664 ofid = clone_fid(dfid); 665 if (IS_ERR(ofid)) { 666 err = PTR_ERR(ofid); 667 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 668 return ERR_PTR(err); 669 } 670 671 err = p9_client_fcreate(ofid, name, perm, mode, extension); 672 if (err < 0) { 673 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 674 goto error; 675 } 676 677 if (!(perm & P9_DMLINK)) { 678 /* now walk from the parent so we can get unopened fid */ 679 fid = p9_client_walk(dfid, 1, &name, 1); 680 if (IS_ERR(fid)) { 681 err = PTR_ERR(fid); 682 p9_debug(P9_DEBUG_VFS, 683 "p9_client_walk failed %d\n", err); 684 fid = NULL; 685 goto error; 686 } 687 /* 688 * instantiate inode and assign the unopened fid to the dentry 689 */ 690 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 691 if (IS_ERR(inode)) { 692 err = PTR_ERR(inode); 693 p9_debug(P9_DEBUG_VFS, 694 "inode creation failed %d\n", err); 695 goto error; 696 } 697 v9fs_fid_add(dentry, fid); 698 d_instantiate(dentry, inode); 699 } 700 return ofid; 701 error: 702 if (ofid) 703 p9_client_clunk(ofid); 704 705 if (fid) 706 p9_client_clunk(fid); 707 708 return ERR_PTR(err); 709 } 710 711 /** 712 * v9fs_vfs_create - VFS hook to create a regular file 713 * 714 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 715 * for mknod(2). 716 * 717 * @dir: directory inode that is being created 718 * @dentry: dentry that is being deleted 719 * @mode: create permissions 720 * 721 */ 722 723 static int 724 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 725 bool excl) 726 { 727 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 728 u32 perm = unixmode2p9mode(v9ses, mode); 729 struct p9_fid *fid; 730 731 /* P9_OEXCL? */ 732 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 733 if (IS_ERR(fid)) 734 return PTR_ERR(fid); 735 736 v9fs_invalidate_inode_attr(dir); 737 p9_client_clunk(fid); 738 739 return 0; 740 } 741 742 /** 743 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 744 * @dir: inode that is being unlinked 745 * @dentry: dentry that is being unlinked 746 * @mode: mode for new directory 747 * 748 */ 749 750 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 751 { 752 int err; 753 u32 perm; 754 struct p9_fid *fid; 755 struct v9fs_session_info *v9ses; 756 757 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 758 err = 0; 759 v9ses = v9fs_inode2v9ses(dir); 760 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 761 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 762 if (IS_ERR(fid)) { 763 err = PTR_ERR(fid); 764 fid = NULL; 765 } else { 766 inc_nlink(dir); 767 v9fs_invalidate_inode_attr(dir); 768 } 769 770 if (fid) 771 p9_client_clunk(fid); 772 773 return err; 774 } 775 776 /** 777 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 778 * @dir: inode that is being walked from 779 * @dentry: dentry that is being walked to? 780 * @flags: lookup flags (unused) 781 * 782 */ 783 784 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 785 unsigned int flags) 786 { 787 struct dentry *res; 788 struct v9fs_session_info *v9ses; 789 struct p9_fid *dfid, *fid; 790 struct inode *inode; 791 const unsigned char *name; 792 793 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 794 dir, dentry, dentry, flags); 795 796 if (dentry->d_name.len > NAME_MAX) 797 return ERR_PTR(-ENAMETOOLONG); 798 799 v9ses = v9fs_inode2v9ses(dir); 800 /* We can walk d_parent because we hold the dir->i_mutex */ 801 dfid = v9fs_parent_fid(dentry); 802 if (IS_ERR(dfid)) 803 return ERR_CAST(dfid); 804 805 /* 806 * Make sure we don't use a wrong inode due to parallel 807 * unlink. For cached mode create calls request for new 808 * inode. But with cache disabled, lookup should do this. 809 */ 810 name = dentry->d_name.name; 811 fid = p9_client_walk(dfid, 1, &name, 1); 812 if (fid == ERR_PTR(-ENOENT)) 813 inode = NULL; 814 else if (IS_ERR(fid)) 815 inode = ERR_CAST(fid); 816 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 817 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 818 else 819 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 820 /* 821 * If we had a rename on the server and a parallel lookup 822 * for the new name, then make sure we instantiate with 823 * the new name. ie look up for a/b, while on server somebody 824 * moved b under k and client parallely did a lookup for 825 * k/b. 826 */ 827 res = d_splice_alias(inode, dentry); 828 if (!IS_ERR(fid)) { 829 if (!res) 830 v9fs_fid_add(dentry, fid); 831 else if (!IS_ERR(res)) 832 v9fs_fid_add(res, fid); 833 else 834 p9_client_clunk(fid); 835 } 836 return res; 837 } 838 839 static int 840 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 841 struct file *file, unsigned flags, umode_t mode) 842 { 843 int err; 844 u32 perm; 845 struct v9fs_inode *v9inode; 846 struct v9fs_session_info *v9ses; 847 struct p9_fid *fid, *inode_fid; 848 struct dentry *res = NULL; 849 850 if (d_in_lookup(dentry)) { 851 res = v9fs_vfs_lookup(dir, dentry, 0); 852 if (IS_ERR(res)) 853 return PTR_ERR(res); 854 855 if (res) 856 dentry = res; 857 } 858 859 /* Only creates */ 860 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 861 return finish_no_open(file, res); 862 863 err = 0; 864 865 v9ses = v9fs_inode2v9ses(dir); 866 perm = unixmode2p9mode(v9ses, mode); 867 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 868 v9fs_uflags2omode(flags, 869 v9fs_proto_dotu(v9ses))); 870 if (IS_ERR(fid)) { 871 err = PTR_ERR(fid); 872 fid = NULL; 873 goto error; 874 } 875 876 v9fs_invalidate_inode_attr(dir); 877 v9inode = V9FS_I(d_inode(dentry)); 878 mutex_lock(&v9inode->v_mutex); 879 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 880 !v9inode->writeback_fid && 881 ((flags & O_ACCMODE) != O_RDONLY)) { 882 /* 883 * clone a fid and add it to writeback_fid 884 * we do it during open time instead of 885 * page dirty time via write_begin/page_mkwrite 886 * because we want write after unlink usecase 887 * to work. 888 */ 889 inode_fid = v9fs_writeback_fid(dentry); 890 if (IS_ERR(inode_fid)) { 891 err = PTR_ERR(inode_fid); 892 mutex_unlock(&v9inode->v_mutex); 893 goto error; 894 } 895 v9inode->writeback_fid = (void *) inode_fid; 896 } 897 mutex_unlock(&v9inode->v_mutex); 898 err = finish_open(file, dentry, generic_file_open); 899 if (err) 900 goto error; 901 902 file->private_data = fid; 903 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 904 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 905 906 file->f_mode |= FMODE_CREATED; 907 out: 908 dput(res); 909 return err; 910 911 error: 912 if (fid) 913 p9_client_clunk(fid); 914 goto out; 915 } 916 917 /** 918 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 919 * @i: inode that is being unlinked 920 * @d: dentry that is being unlinked 921 * 922 */ 923 924 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 925 { 926 return v9fs_remove(i, d, 0); 927 } 928 929 /** 930 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 931 * @i: inode that is being unlinked 932 * @d: dentry that is being unlinked 933 * 934 */ 935 936 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 937 { 938 return v9fs_remove(i, d, AT_REMOVEDIR); 939 } 940 941 /** 942 * v9fs_vfs_rename - VFS hook to rename an inode 943 * @old_dir: old dir inode 944 * @old_dentry: old dentry 945 * @new_dir: new dir inode 946 * @new_dentry: new dentry 947 * 948 */ 949 950 int 951 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 952 struct inode *new_dir, struct dentry *new_dentry, 953 unsigned int flags) 954 { 955 int retval; 956 struct inode *old_inode; 957 struct inode *new_inode; 958 struct v9fs_session_info *v9ses; 959 struct p9_fid *oldfid; 960 struct p9_fid *olddirfid; 961 struct p9_fid *newdirfid; 962 struct p9_wstat wstat; 963 964 if (flags) 965 return -EINVAL; 966 967 p9_debug(P9_DEBUG_VFS, "\n"); 968 retval = 0; 969 old_inode = d_inode(old_dentry); 970 new_inode = d_inode(new_dentry); 971 v9ses = v9fs_inode2v9ses(old_inode); 972 oldfid = v9fs_fid_lookup(old_dentry); 973 if (IS_ERR(oldfid)) 974 return PTR_ERR(oldfid); 975 976 olddirfid = clone_fid(v9fs_parent_fid(old_dentry)); 977 if (IS_ERR(olddirfid)) { 978 retval = PTR_ERR(olddirfid); 979 goto done; 980 } 981 982 newdirfid = clone_fid(v9fs_parent_fid(new_dentry)); 983 if (IS_ERR(newdirfid)) { 984 retval = PTR_ERR(newdirfid); 985 goto clunk_olddir; 986 } 987 988 down_write(&v9ses->rename_sem); 989 if (v9fs_proto_dotl(v9ses)) { 990 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 991 newdirfid, new_dentry->d_name.name); 992 if (retval == -EOPNOTSUPP) 993 retval = p9_client_rename(oldfid, newdirfid, 994 new_dentry->d_name.name); 995 if (retval != -EOPNOTSUPP) 996 goto clunk_newdir; 997 } 998 if (old_dentry->d_parent != new_dentry->d_parent) { 999 /* 1000 * 9P .u can only handle file rename in the same directory 1001 */ 1002 1003 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1004 retval = -EXDEV; 1005 goto clunk_newdir; 1006 } 1007 v9fs_blank_wstat(&wstat); 1008 wstat.muid = v9ses->uname; 1009 wstat.name = new_dentry->d_name.name; 1010 retval = p9_client_wstat(oldfid, &wstat); 1011 1012 clunk_newdir: 1013 if (!retval) { 1014 if (new_inode) { 1015 if (S_ISDIR(new_inode->i_mode)) 1016 clear_nlink(new_inode); 1017 else 1018 v9fs_dec_count(new_inode); 1019 } 1020 if (S_ISDIR(old_inode->i_mode)) { 1021 if (!new_inode) 1022 inc_nlink(new_dir); 1023 v9fs_dec_count(old_dir); 1024 } 1025 v9fs_invalidate_inode_attr(old_inode); 1026 v9fs_invalidate_inode_attr(old_dir); 1027 v9fs_invalidate_inode_attr(new_dir); 1028 1029 /* successful rename */ 1030 d_move(old_dentry, new_dentry); 1031 } 1032 up_write(&v9ses->rename_sem); 1033 p9_client_clunk(newdirfid); 1034 1035 clunk_olddir: 1036 p9_client_clunk(olddirfid); 1037 1038 done: 1039 return retval; 1040 } 1041 1042 /** 1043 * v9fs_vfs_getattr - retrieve file metadata 1044 * @path: Object to query 1045 * @stat: metadata structure to populate 1046 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1047 * @flags: AT_STATX_xxx setting 1048 * 1049 */ 1050 1051 static int 1052 v9fs_vfs_getattr(const struct path *path, struct kstat *stat, 1053 u32 request_mask, unsigned int flags) 1054 { 1055 struct dentry *dentry = path->dentry; 1056 struct v9fs_session_info *v9ses; 1057 struct p9_fid *fid; 1058 struct p9_wstat *st; 1059 1060 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1061 v9ses = v9fs_dentry2v9ses(dentry); 1062 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1063 generic_fillattr(d_inode(dentry), stat); 1064 return 0; 1065 } 1066 fid = v9fs_fid_lookup(dentry); 1067 if (IS_ERR(fid)) 1068 return PTR_ERR(fid); 1069 1070 st = p9_client_stat(fid); 1071 if (IS_ERR(st)) 1072 return PTR_ERR(st); 1073 1074 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1075 generic_fillattr(d_inode(dentry), stat); 1076 1077 p9stat_free(st); 1078 kfree(st); 1079 return 0; 1080 } 1081 1082 /** 1083 * v9fs_vfs_setattr - set file metadata 1084 * @dentry: file whose metadata to set 1085 * @iattr: metadata assignment structure 1086 * 1087 */ 1088 1089 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1090 { 1091 int retval; 1092 struct v9fs_session_info *v9ses; 1093 struct p9_fid *fid; 1094 struct p9_wstat wstat; 1095 1096 p9_debug(P9_DEBUG_VFS, "\n"); 1097 retval = setattr_prepare(dentry, iattr); 1098 if (retval) 1099 return retval; 1100 1101 retval = -EPERM; 1102 v9ses = v9fs_dentry2v9ses(dentry); 1103 fid = v9fs_fid_lookup(dentry); 1104 if(IS_ERR(fid)) 1105 return PTR_ERR(fid); 1106 1107 v9fs_blank_wstat(&wstat); 1108 if (iattr->ia_valid & ATTR_MODE) 1109 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1110 1111 if (iattr->ia_valid & ATTR_MTIME) 1112 wstat.mtime = iattr->ia_mtime.tv_sec; 1113 1114 if (iattr->ia_valid & ATTR_ATIME) 1115 wstat.atime = iattr->ia_atime.tv_sec; 1116 1117 if (iattr->ia_valid & ATTR_SIZE) 1118 wstat.length = iattr->ia_size; 1119 1120 if (v9fs_proto_dotu(v9ses)) { 1121 if (iattr->ia_valid & ATTR_UID) 1122 wstat.n_uid = iattr->ia_uid; 1123 1124 if (iattr->ia_valid & ATTR_GID) 1125 wstat.n_gid = iattr->ia_gid; 1126 } 1127 1128 /* Write all dirty data */ 1129 if (d_is_reg(dentry)) 1130 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1131 1132 retval = p9_client_wstat(fid, &wstat); 1133 if (retval < 0) 1134 return retval; 1135 1136 if ((iattr->ia_valid & ATTR_SIZE) && 1137 iattr->ia_size != i_size_read(d_inode(dentry))) 1138 truncate_setsize(d_inode(dentry), iattr->ia_size); 1139 1140 v9fs_invalidate_inode_attr(d_inode(dentry)); 1141 1142 setattr_copy(d_inode(dentry), iattr); 1143 mark_inode_dirty(d_inode(dentry)); 1144 return 0; 1145 } 1146 1147 /** 1148 * v9fs_stat2inode - populate an inode structure with mistat info 1149 * @stat: Plan 9 metadata (mistat) structure 1150 * @inode: inode to populate 1151 * @sb: superblock of filesystem 1152 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1153 * 1154 */ 1155 1156 void 1157 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1158 struct super_block *sb, unsigned int flags) 1159 { 1160 umode_t mode; 1161 char ext[32]; 1162 char tag_name[14]; 1163 unsigned int i_nlink; 1164 struct v9fs_session_info *v9ses = sb->s_fs_info; 1165 struct v9fs_inode *v9inode = V9FS_I(inode); 1166 1167 set_nlink(inode, 1); 1168 1169 inode->i_atime.tv_sec = stat->atime; 1170 inode->i_mtime.tv_sec = stat->mtime; 1171 inode->i_ctime.tv_sec = stat->mtime; 1172 1173 inode->i_uid = v9ses->dfltuid; 1174 inode->i_gid = v9ses->dfltgid; 1175 1176 if (v9fs_proto_dotu(v9ses)) { 1177 inode->i_uid = stat->n_uid; 1178 inode->i_gid = stat->n_gid; 1179 } 1180 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1181 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1182 /* 1183 * Hadlink support got added later to 1184 * to the .u extension. So there can be 1185 * server out there that doesn't support 1186 * this even with .u extension. So check 1187 * for non NULL stat->extension 1188 */ 1189 strlcpy(ext, stat->extension, sizeof(ext)); 1190 /* HARDLINKCOUNT %u */ 1191 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1192 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1193 set_nlink(inode, i_nlink); 1194 } 1195 } 1196 mode = p9mode2perm(v9ses, stat); 1197 mode |= inode->i_mode & ~S_IALLUGO; 1198 inode->i_mode = mode; 1199 1200 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1201 v9fs_i_size_write(inode, stat->length); 1202 /* not real number of blocks, but 512 byte ones ... */ 1203 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1204 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1205 } 1206 1207 /** 1208 * v9fs_qid2ino - convert qid into inode number 1209 * @qid: qid to hash 1210 * 1211 * BUG: potential for inode number collisions? 1212 */ 1213 1214 ino_t v9fs_qid2ino(struct p9_qid *qid) 1215 { 1216 u64 path = qid->path + 2; 1217 ino_t i = 0; 1218 1219 if (sizeof(ino_t) == sizeof(path)) 1220 memcpy(&i, &path, sizeof(ino_t)); 1221 else 1222 i = (ino_t) (path ^ (path >> 32)); 1223 1224 return i; 1225 } 1226 1227 /** 1228 * v9fs_vfs_get_link - follow a symlink path 1229 * @dentry: dentry for symlink 1230 * @inode: inode for symlink 1231 * @done: delayed call for when we are done with the return value 1232 */ 1233 1234 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1235 struct inode *inode, 1236 struct delayed_call *done) 1237 { 1238 struct v9fs_session_info *v9ses; 1239 struct p9_fid *fid; 1240 struct p9_wstat *st; 1241 char *res; 1242 1243 if (!dentry) 1244 return ERR_PTR(-ECHILD); 1245 1246 v9ses = v9fs_dentry2v9ses(dentry); 1247 fid = v9fs_fid_lookup(dentry); 1248 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1249 1250 if (IS_ERR(fid)) 1251 return ERR_CAST(fid); 1252 1253 if (!v9fs_proto_dotu(v9ses)) 1254 return ERR_PTR(-EBADF); 1255 1256 st = p9_client_stat(fid); 1257 if (IS_ERR(st)) 1258 return ERR_CAST(st); 1259 1260 if (!(st->mode & P9_DMSYMLINK)) { 1261 p9stat_free(st); 1262 kfree(st); 1263 return ERR_PTR(-EINVAL); 1264 } 1265 res = st->extension; 1266 st->extension = NULL; 1267 if (strlen(res) >= PATH_MAX) 1268 res[PATH_MAX - 1] = '\0'; 1269 1270 p9stat_free(st); 1271 kfree(st); 1272 set_delayed_call(done, kfree_link, res); 1273 return res; 1274 } 1275 1276 /** 1277 * v9fs_vfs_mkspecial - create a special file 1278 * @dir: inode to create special file in 1279 * @dentry: dentry to create 1280 * @perm: mode to create special file 1281 * @extension: 9p2000.u format extension string representing special file 1282 * 1283 */ 1284 1285 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1286 u32 perm, const char *extension) 1287 { 1288 struct p9_fid *fid; 1289 struct v9fs_session_info *v9ses; 1290 1291 v9ses = v9fs_inode2v9ses(dir); 1292 if (!v9fs_proto_dotu(v9ses)) { 1293 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1294 return -EPERM; 1295 } 1296 1297 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1298 P9_OREAD); 1299 if (IS_ERR(fid)) 1300 return PTR_ERR(fid); 1301 1302 v9fs_invalidate_inode_attr(dir); 1303 p9_client_clunk(fid); 1304 return 0; 1305 } 1306 1307 /** 1308 * v9fs_vfs_symlink - helper function to create symlinks 1309 * @dir: directory inode containing symlink 1310 * @dentry: dentry for symlink 1311 * @symname: symlink data 1312 * 1313 * See Also: 9P2000.u RFC for more information 1314 * 1315 */ 1316 1317 static int 1318 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1319 { 1320 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1321 dir->i_ino, dentry, symname); 1322 1323 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1324 } 1325 1326 #define U32_MAX_DIGITS 10 1327 1328 /** 1329 * v9fs_vfs_link - create a hardlink 1330 * @old_dentry: dentry for file to link to 1331 * @dir: inode destination for new link 1332 * @dentry: dentry for link 1333 * 1334 */ 1335 1336 static int 1337 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1338 struct dentry *dentry) 1339 { 1340 int retval; 1341 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1342 struct p9_fid *oldfid; 1343 1344 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1345 dir->i_ino, dentry, old_dentry); 1346 1347 oldfid = v9fs_fid_clone(old_dentry); 1348 if (IS_ERR(oldfid)) 1349 return PTR_ERR(oldfid); 1350 1351 sprintf(name, "%d\n", oldfid->fid); 1352 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1353 if (!retval) { 1354 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1355 v9fs_invalidate_inode_attr(dir); 1356 } 1357 p9_client_clunk(oldfid); 1358 return retval; 1359 } 1360 1361 /** 1362 * v9fs_vfs_mknod - create a special file 1363 * @dir: inode destination for new link 1364 * @dentry: dentry for file 1365 * @mode: mode for creation 1366 * @rdev: device associated with special file 1367 * 1368 */ 1369 1370 static int 1371 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1372 { 1373 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1374 int retval; 1375 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1376 u32 perm; 1377 1378 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1379 dir->i_ino, dentry, mode, 1380 MAJOR(rdev), MINOR(rdev)); 1381 1382 /* build extension */ 1383 if (S_ISBLK(mode)) 1384 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1385 else if (S_ISCHR(mode)) 1386 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1387 else 1388 *name = 0; 1389 1390 perm = unixmode2p9mode(v9ses, mode); 1391 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1392 1393 return retval; 1394 } 1395 1396 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1397 { 1398 int umode; 1399 dev_t rdev; 1400 struct p9_wstat *st; 1401 struct v9fs_session_info *v9ses; 1402 unsigned int flags; 1403 1404 v9ses = v9fs_inode2v9ses(inode); 1405 st = p9_client_stat(fid); 1406 if (IS_ERR(st)) 1407 return PTR_ERR(st); 1408 /* 1409 * Don't update inode if the file type is different 1410 */ 1411 umode = p9mode2unixmode(v9ses, st, &rdev); 1412 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1413 goto out; 1414 1415 /* 1416 * We don't want to refresh inode->i_size, 1417 * because we may have cached data 1418 */ 1419 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1420 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1421 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1422 out: 1423 p9stat_free(st); 1424 kfree(st); 1425 return 0; 1426 } 1427 1428 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1429 .create = v9fs_vfs_create, 1430 .lookup = v9fs_vfs_lookup, 1431 .atomic_open = v9fs_vfs_atomic_open, 1432 .symlink = v9fs_vfs_symlink, 1433 .link = v9fs_vfs_link, 1434 .unlink = v9fs_vfs_unlink, 1435 .mkdir = v9fs_vfs_mkdir, 1436 .rmdir = v9fs_vfs_rmdir, 1437 .mknod = v9fs_vfs_mknod, 1438 .rename = v9fs_vfs_rename, 1439 .getattr = v9fs_vfs_getattr, 1440 .setattr = v9fs_vfs_setattr, 1441 }; 1442 1443 static const struct inode_operations v9fs_dir_inode_operations = { 1444 .create = v9fs_vfs_create, 1445 .lookup = v9fs_vfs_lookup, 1446 .atomic_open = v9fs_vfs_atomic_open, 1447 .unlink = v9fs_vfs_unlink, 1448 .mkdir = v9fs_vfs_mkdir, 1449 .rmdir = v9fs_vfs_rmdir, 1450 .mknod = v9fs_vfs_mknod, 1451 .rename = v9fs_vfs_rename, 1452 .getattr = v9fs_vfs_getattr, 1453 .setattr = v9fs_vfs_setattr, 1454 }; 1455 1456 static const struct inode_operations v9fs_file_inode_operations = { 1457 .getattr = v9fs_vfs_getattr, 1458 .setattr = v9fs_vfs_setattr, 1459 }; 1460 1461 static const struct inode_operations v9fs_symlink_inode_operations = { 1462 .get_link = v9fs_vfs_get_link, 1463 .getattr = v9fs_vfs_getattr, 1464 .setattr = v9fs_vfs_setattr, 1465 }; 1466 1467