1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * This file contains vfs inode ops for the 9P2000 protocol. 4 * 5 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 6 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 7 */ 8 9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 10 11 #include <linux/module.h> 12 #include <linux/errno.h> 13 #include <linux/fs.h> 14 #include <linux/file.h> 15 #include <linux/pagemap.h> 16 #include <linux/stat.h> 17 #include <linux/string.h> 18 #include <linux/inet.h> 19 #include <linux/namei.h> 20 #include <linux/idr.h> 21 #include <linux/sched.h> 22 #include <linux/slab.h> 23 #include <linux/xattr.h> 24 #include <linux/posix_acl.h> 25 #include <net/9p/9p.h> 26 #include <net/9p/client.h> 27 28 #include "v9fs.h" 29 #include "v9fs_vfs.h" 30 #include "fid.h" 31 #include "cache.h" 32 #include "xattr.h" 33 #include "acl.h" 34 35 static const struct inode_operations v9fs_dir_inode_operations; 36 static const struct inode_operations v9fs_dir_inode_operations_dotu; 37 static const struct inode_operations v9fs_file_inode_operations; 38 static const struct inode_operations v9fs_symlink_inode_operations; 39 40 /** 41 * unixmode2p9mode - convert unix mode bits to plan 9 42 * @v9ses: v9fs session information 43 * @mode: mode to convert 44 * 45 */ 46 47 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 48 { 49 int res; 50 51 res = mode & 0777; 52 if (S_ISDIR(mode)) 53 res |= P9_DMDIR; 54 if (v9fs_proto_dotu(v9ses)) { 55 if (v9ses->nodev == 0) { 56 if (S_ISSOCK(mode)) 57 res |= P9_DMSOCKET; 58 if (S_ISFIFO(mode)) 59 res |= P9_DMNAMEDPIPE; 60 if (S_ISBLK(mode)) 61 res |= P9_DMDEVICE; 62 if (S_ISCHR(mode)) 63 res |= P9_DMDEVICE; 64 } 65 66 if ((mode & S_ISUID) == S_ISUID) 67 res |= P9_DMSETUID; 68 if ((mode & S_ISGID) == S_ISGID) 69 res |= P9_DMSETGID; 70 if ((mode & S_ISVTX) == S_ISVTX) 71 res |= P9_DMSETVTX; 72 } 73 return res; 74 } 75 76 /** 77 * p9mode2perm- convert plan9 mode bits to unix permission bits 78 * @v9ses: v9fs session information 79 * @stat: p9_wstat from which mode need to be derived 80 * 81 */ 82 static int p9mode2perm(struct v9fs_session_info *v9ses, 83 struct p9_wstat *stat) 84 { 85 int res; 86 int mode = stat->mode; 87 88 res = mode & S_IALLUGO; 89 if (v9fs_proto_dotu(v9ses)) { 90 if ((mode & P9_DMSETUID) == P9_DMSETUID) 91 res |= S_ISUID; 92 93 if ((mode & P9_DMSETGID) == P9_DMSETGID) 94 res |= S_ISGID; 95 96 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 97 res |= S_ISVTX; 98 } 99 return res; 100 } 101 102 /** 103 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 104 * @v9ses: v9fs session information 105 * @stat: p9_wstat from which mode need to be derived 106 * @rdev: major number, minor number in case of device files. 107 * 108 */ 109 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 110 struct p9_wstat *stat, dev_t *rdev) 111 { 112 int res, r; 113 u32 mode = stat->mode; 114 115 *rdev = 0; 116 res = p9mode2perm(v9ses, stat); 117 118 if ((mode & P9_DMDIR) == P9_DMDIR) 119 res |= S_IFDIR; 120 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 121 res |= S_IFLNK; 122 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 123 && (v9ses->nodev == 0)) 124 res |= S_IFSOCK; 125 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 126 && (v9ses->nodev == 0)) 127 res |= S_IFIFO; 128 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 129 && (v9ses->nodev == 0)) { 130 char type = 0; 131 int major = -1, minor = -1; 132 133 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor); 134 if (r != 3) { 135 p9_debug(P9_DEBUG_ERROR, 136 "invalid device string, umode will be bogus: %s\n", 137 stat->extension); 138 return res; 139 } 140 switch (type) { 141 case 'c': 142 res |= S_IFCHR; 143 break; 144 case 'b': 145 res |= S_IFBLK; 146 break; 147 default: 148 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 149 type, stat->extension); 150 } 151 *rdev = MKDEV(major, minor); 152 } else 153 res |= S_IFREG; 154 155 return res; 156 } 157 158 /** 159 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 160 * @uflags: flags to convert 161 * @extended: if .u extensions are active 162 */ 163 164 int v9fs_uflags2omode(int uflags, int extended) 165 { 166 int ret; 167 168 ret = 0; 169 switch (uflags&3) { 170 default: 171 case O_RDONLY: 172 ret = P9_OREAD; 173 break; 174 175 case O_WRONLY: 176 ret = P9_OWRITE; 177 break; 178 179 case O_RDWR: 180 ret = P9_ORDWR; 181 break; 182 } 183 184 if (extended) { 185 if (uflags & O_EXCL) 186 ret |= P9_OEXCL; 187 188 if (uflags & O_APPEND) 189 ret |= P9_OAPPEND; 190 } 191 192 return ret; 193 } 194 195 /** 196 * v9fs_blank_wstat - helper function to setup a 9P stat structure 197 * @wstat: structure to initialize 198 * 199 */ 200 201 void 202 v9fs_blank_wstat(struct p9_wstat *wstat) 203 { 204 wstat->type = ~0; 205 wstat->dev = ~0; 206 wstat->qid.type = ~0; 207 wstat->qid.version = ~0; 208 *((long long *)&wstat->qid.path) = ~0; 209 wstat->mode = ~0; 210 wstat->atime = ~0; 211 wstat->mtime = ~0; 212 wstat->length = ~0; 213 wstat->name = NULL; 214 wstat->uid = NULL; 215 wstat->gid = NULL; 216 wstat->muid = NULL; 217 wstat->n_uid = INVALID_UID; 218 wstat->n_gid = INVALID_GID; 219 wstat->n_muid = INVALID_UID; 220 wstat->extension = NULL; 221 } 222 223 /** 224 * v9fs_alloc_inode - helper function to allocate an inode 225 * @sb: The superblock to allocate the inode from 226 */ 227 struct inode *v9fs_alloc_inode(struct super_block *sb) 228 { 229 struct v9fs_inode *v9inode; 230 231 v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL); 232 if (!v9inode) 233 return NULL; 234 #ifdef CONFIG_9P_FSCACHE 235 v9inode->fscache = NULL; 236 mutex_init(&v9inode->fscache_lock); 237 #endif 238 v9inode->writeback_fid = NULL; 239 v9inode->cache_validity = 0; 240 mutex_init(&v9inode->v_mutex); 241 return &v9inode->vfs_inode; 242 } 243 244 /** 245 * v9fs_free_inode - destroy an inode 246 * @inode: The inode to be freed 247 */ 248 249 void v9fs_free_inode(struct inode *inode) 250 { 251 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 252 } 253 254 int v9fs_init_inode(struct v9fs_session_info *v9ses, 255 struct inode *inode, umode_t mode, dev_t rdev) 256 { 257 int err = 0; 258 259 inode_init_owner(&init_user_ns, inode, NULL, mode); 260 inode->i_blocks = 0; 261 inode->i_rdev = rdev; 262 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 263 inode->i_mapping->a_ops = &v9fs_addr_operations; 264 inode->i_private = NULL; 265 266 switch (mode & S_IFMT) { 267 case S_IFIFO: 268 case S_IFBLK: 269 case S_IFCHR: 270 case S_IFSOCK: 271 if (v9fs_proto_dotl(v9ses)) { 272 inode->i_op = &v9fs_file_inode_operations_dotl; 273 } else if (v9fs_proto_dotu(v9ses)) { 274 inode->i_op = &v9fs_file_inode_operations; 275 } else { 276 p9_debug(P9_DEBUG_ERROR, 277 "special files without extended mode\n"); 278 err = -EINVAL; 279 goto error; 280 } 281 init_special_inode(inode, inode->i_mode, inode->i_rdev); 282 break; 283 case S_IFREG: 284 if (v9fs_proto_dotl(v9ses)) { 285 inode->i_op = &v9fs_file_inode_operations_dotl; 286 if (v9ses->cache == CACHE_LOOSE || 287 v9ses->cache == CACHE_FSCACHE) 288 inode->i_fop = 289 &v9fs_cached_file_operations_dotl; 290 else if (v9ses->cache == CACHE_MMAP) 291 inode->i_fop = &v9fs_mmap_file_operations_dotl; 292 else 293 inode->i_fop = &v9fs_file_operations_dotl; 294 } else { 295 inode->i_op = &v9fs_file_inode_operations; 296 if (v9ses->cache == CACHE_LOOSE || 297 v9ses->cache == CACHE_FSCACHE) 298 inode->i_fop = 299 &v9fs_cached_file_operations; 300 else if (v9ses->cache == CACHE_MMAP) 301 inode->i_fop = &v9fs_mmap_file_operations; 302 else 303 inode->i_fop = &v9fs_file_operations; 304 } 305 306 break; 307 case S_IFLNK: 308 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 309 p9_debug(P9_DEBUG_ERROR, 310 "extended modes used with legacy protocol\n"); 311 err = -EINVAL; 312 goto error; 313 } 314 315 if (v9fs_proto_dotl(v9ses)) 316 inode->i_op = &v9fs_symlink_inode_operations_dotl; 317 else 318 inode->i_op = &v9fs_symlink_inode_operations; 319 320 break; 321 case S_IFDIR: 322 inc_nlink(inode); 323 if (v9fs_proto_dotl(v9ses)) 324 inode->i_op = &v9fs_dir_inode_operations_dotl; 325 else if (v9fs_proto_dotu(v9ses)) 326 inode->i_op = &v9fs_dir_inode_operations_dotu; 327 else 328 inode->i_op = &v9fs_dir_inode_operations; 329 330 if (v9fs_proto_dotl(v9ses)) 331 inode->i_fop = &v9fs_dir_operations_dotl; 332 else 333 inode->i_fop = &v9fs_dir_operations; 334 335 break; 336 default: 337 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 338 mode, mode & S_IFMT); 339 err = -EINVAL; 340 goto error; 341 } 342 error: 343 return err; 344 345 } 346 347 /** 348 * v9fs_get_inode - helper function to setup an inode 349 * @sb: superblock 350 * @mode: mode to setup inode with 351 * @rdev: The device numbers to set 352 */ 353 354 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 355 { 356 int err; 357 struct inode *inode; 358 struct v9fs_session_info *v9ses = sb->s_fs_info; 359 360 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 361 362 inode = new_inode(sb); 363 if (!inode) { 364 pr_warn("%s (%d): Problem allocating inode\n", 365 __func__, task_pid_nr(current)); 366 return ERR_PTR(-ENOMEM); 367 } 368 err = v9fs_init_inode(v9ses, inode, mode, rdev); 369 if (err) { 370 iput(inode); 371 return ERR_PTR(err); 372 } 373 return inode; 374 } 375 376 /** 377 * v9fs_evict_inode - Remove an inode from the inode cache 378 * @inode: inode to release 379 * 380 */ 381 void v9fs_evict_inode(struct inode *inode) 382 { 383 struct v9fs_inode *v9inode = V9FS_I(inode); 384 385 truncate_inode_pages_final(&inode->i_data); 386 clear_inode(inode); 387 filemap_fdatawrite(&inode->i_data); 388 389 v9fs_cache_inode_put_cookie(inode); 390 /* clunk the fid stashed in writeback_fid */ 391 if (v9inode->writeback_fid) { 392 p9_client_clunk(v9inode->writeback_fid); 393 v9inode->writeback_fid = NULL; 394 } 395 } 396 397 static int v9fs_test_inode(struct inode *inode, void *data) 398 { 399 int umode; 400 dev_t rdev; 401 struct v9fs_inode *v9inode = V9FS_I(inode); 402 struct p9_wstat *st = (struct p9_wstat *)data; 403 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 404 405 umode = p9mode2unixmode(v9ses, st, &rdev); 406 /* don't match inode of different type */ 407 if (inode_wrong_type(inode, umode)) 408 return 0; 409 410 /* compare qid details */ 411 if (memcmp(&v9inode->qid.version, 412 &st->qid.version, sizeof(v9inode->qid.version))) 413 return 0; 414 415 if (v9inode->qid.type != st->qid.type) 416 return 0; 417 418 if (v9inode->qid.path != st->qid.path) 419 return 0; 420 return 1; 421 } 422 423 static int v9fs_test_new_inode(struct inode *inode, void *data) 424 { 425 return 0; 426 } 427 428 static int v9fs_set_inode(struct inode *inode, void *data) 429 { 430 struct v9fs_inode *v9inode = V9FS_I(inode); 431 struct p9_wstat *st = (struct p9_wstat *)data; 432 433 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 434 return 0; 435 } 436 437 static struct inode *v9fs_qid_iget(struct super_block *sb, 438 struct p9_qid *qid, 439 struct p9_wstat *st, 440 int new) 441 { 442 dev_t rdev; 443 int retval; 444 umode_t umode; 445 unsigned long i_ino; 446 struct inode *inode; 447 struct v9fs_session_info *v9ses = sb->s_fs_info; 448 int (*test)(struct inode *inode, void *data); 449 450 if (new) 451 test = v9fs_test_new_inode; 452 else 453 test = v9fs_test_inode; 454 455 i_ino = v9fs_qid2ino(qid); 456 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 457 if (!inode) 458 return ERR_PTR(-ENOMEM); 459 if (!(inode->i_state & I_NEW)) 460 return inode; 461 /* 462 * initialize the inode with the stat info 463 * FIXME!! we may need support for stale inodes 464 * later. 465 */ 466 inode->i_ino = i_ino; 467 umode = p9mode2unixmode(v9ses, st, &rdev); 468 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 469 if (retval) 470 goto error; 471 472 v9fs_stat2inode(st, inode, sb, 0); 473 v9fs_cache_inode_get_cookie(inode); 474 unlock_new_inode(inode); 475 return inode; 476 error: 477 iget_failed(inode); 478 return ERR_PTR(retval); 479 480 } 481 482 struct inode * 483 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 484 struct super_block *sb, int new) 485 { 486 struct p9_wstat *st; 487 struct inode *inode = NULL; 488 489 st = p9_client_stat(fid); 490 if (IS_ERR(st)) 491 return ERR_CAST(st); 492 493 inode = v9fs_qid_iget(sb, &st->qid, st, new); 494 p9stat_free(st); 495 kfree(st); 496 return inode; 497 } 498 499 /** 500 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 501 * plan 9 AT flag. 502 * @flags: flags to convert 503 */ 504 static int v9fs_at_to_dotl_flags(int flags) 505 { 506 int rflags = 0; 507 508 if (flags & AT_REMOVEDIR) 509 rflags |= P9_DOTL_AT_REMOVEDIR; 510 511 return rflags; 512 } 513 514 /** 515 * v9fs_dec_count - helper functon to drop i_nlink. 516 * 517 * If a directory had nlink <= 2 (including . and ..), then we should not drop 518 * the link count, which indicates the underlying exported fs doesn't maintain 519 * nlink accurately. e.g. 520 * - overlayfs sets nlink to 1 for merged dir 521 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 522 * than EXT4_LINK_MAX (65000) links. 523 * 524 * @inode: inode whose nlink is being dropped 525 */ 526 static void v9fs_dec_count(struct inode *inode) 527 { 528 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 529 drop_nlink(inode); 530 } 531 532 /** 533 * v9fs_remove - helper function to remove files and directories 534 * @dir: directory inode that is being deleted 535 * @dentry: dentry that is being deleted 536 * @flags: removing a directory 537 * 538 */ 539 540 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 541 { 542 struct inode *inode; 543 int retval = -EOPNOTSUPP; 544 struct p9_fid *v9fid, *dfid; 545 struct v9fs_session_info *v9ses; 546 547 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 548 dir, dentry, flags); 549 550 v9ses = v9fs_inode2v9ses(dir); 551 inode = d_inode(dentry); 552 dfid = v9fs_parent_fid(dentry); 553 if (IS_ERR(dfid)) { 554 retval = PTR_ERR(dfid); 555 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 556 return retval; 557 } 558 if (v9fs_proto_dotl(v9ses)) 559 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 560 v9fs_at_to_dotl_flags(flags)); 561 p9_client_clunk(dfid); 562 if (retval == -EOPNOTSUPP) { 563 /* Try the one based on path */ 564 v9fid = v9fs_fid_clone(dentry); 565 if (IS_ERR(v9fid)) 566 return PTR_ERR(v9fid); 567 retval = p9_client_remove(v9fid); 568 } 569 if (!retval) { 570 /* 571 * directories on unlink should have zero 572 * link count 573 */ 574 if (flags & AT_REMOVEDIR) { 575 clear_nlink(inode); 576 v9fs_dec_count(dir); 577 } else 578 v9fs_dec_count(inode); 579 580 v9fs_invalidate_inode_attr(inode); 581 v9fs_invalidate_inode_attr(dir); 582 583 /* invalidate all fids associated with dentry */ 584 /* NOTE: This will not include open fids */ 585 dentry->d_op->d_release(dentry); 586 } 587 return retval; 588 } 589 590 /** 591 * v9fs_create - Create a file 592 * @v9ses: session information 593 * @dir: directory that dentry is being created in 594 * @dentry: dentry that is being created 595 * @extension: 9p2000.u extension string to support devices, etc. 596 * @perm: create permissions 597 * @mode: open mode 598 * 599 */ 600 static struct p9_fid * 601 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 602 struct dentry *dentry, char *extension, u32 perm, u8 mode) 603 { 604 int err; 605 const unsigned char *name; 606 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 607 struct inode *inode; 608 609 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 610 611 err = 0; 612 name = dentry->d_name.name; 613 dfid = v9fs_parent_fid(dentry); 614 if (IS_ERR(dfid)) { 615 err = PTR_ERR(dfid); 616 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 617 return ERR_PTR(err); 618 } 619 620 /* clone a fid to use for creation */ 621 ofid = clone_fid(dfid); 622 if (IS_ERR(ofid)) { 623 err = PTR_ERR(ofid); 624 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 625 p9_client_clunk(dfid); 626 return ERR_PTR(err); 627 } 628 629 err = p9_client_fcreate(ofid, name, perm, mode, extension); 630 if (err < 0) { 631 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 632 p9_client_clunk(dfid); 633 goto error; 634 } 635 636 if (!(perm & P9_DMLINK)) { 637 /* now walk from the parent so we can get unopened fid */ 638 fid = p9_client_walk(dfid, 1, &name, 1); 639 if (IS_ERR(fid)) { 640 err = PTR_ERR(fid); 641 p9_debug(P9_DEBUG_VFS, 642 "p9_client_walk failed %d\n", err); 643 fid = NULL; 644 p9_client_clunk(dfid); 645 goto error; 646 } 647 /* 648 * instantiate inode and assign the unopened fid to the dentry 649 */ 650 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 651 if (IS_ERR(inode)) { 652 err = PTR_ERR(inode); 653 p9_debug(P9_DEBUG_VFS, 654 "inode creation failed %d\n", err); 655 p9_client_clunk(dfid); 656 goto error; 657 } 658 v9fs_fid_add(dentry, fid); 659 d_instantiate(dentry, inode); 660 } 661 p9_client_clunk(dfid); 662 return ofid; 663 error: 664 if (ofid) 665 p9_client_clunk(ofid); 666 667 if (fid) 668 p9_client_clunk(fid); 669 670 return ERR_PTR(err); 671 } 672 673 /** 674 * v9fs_vfs_create - VFS hook to create a regular file 675 * @mnt_userns: The user namespace of the mount 676 * @dir: The parent directory 677 * @dentry: The name of file to be created 678 * @mode: The UNIX file mode to set 679 * @excl: True if the file must not yet exist 680 * 681 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 682 * for mknod(2). 683 * 684 */ 685 686 static int 687 v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, 688 struct dentry *dentry, umode_t mode, bool excl) 689 { 690 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 691 u32 perm = unixmode2p9mode(v9ses, mode); 692 struct p9_fid *fid; 693 694 /* P9_OEXCL? */ 695 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 696 if (IS_ERR(fid)) 697 return PTR_ERR(fid); 698 699 v9fs_invalidate_inode_attr(dir); 700 p9_client_clunk(fid); 701 702 return 0; 703 } 704 705 /** 706 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 707 * @mnt_userns: The user namespace of the mount 708 * @dir: inode that is being unlinked 709 * @dentry: dentry that is being unlinked 710 * @mode: mode for new directory 711 * 712 */ 713 714 static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 715 struct dentry *dentry, umode_t mode) 716 { 717 int err; 718 u32 perm; 719 struct p9_fid *fid; 720 struct v9fs_session_info *v9ses; 721 722 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 723 err = 0; 724 v9ses = v9fs_inode2v9ses(dir); 725 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 727 if (IS_ERR(fid)) { 728 err = PTR_ERR(fid); 729 fid = NULL; 730 } else { 731 inc_nlink(dir); 732 v9fs_invalidate_inode_attr(dir); 733 } 734 735 if (fid) 736 p9_client_clunk(fid); 737 738 return err; 739 } 740 741 /** 742 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 743 * @dir: inode that is being walked from 744 * @dentry: dentry that is being walked to? 745 * @flags: lookup flags (unused) 746 * 747 */ 748 749 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 750 unsigned int flags) 751 { 752 struct dentry *res; 753 struct v9fs_session_info *v9ses; 754 struct p9_fid *dfid, *fid; 755 struct inode *inode; 756 const unsigned char *name; 757 758 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 759 dir, dentry, dentry, flags); 760 761 if (dentry->d_name.len > NAME_MAX) 762 return ERR_PTR(-ENAMETOOLONG); 763 764 v9ses = v9fs_inode2v9ses(dir); 765 /* We can walk d_parent because we hold the dir->i_mutex */ 766 dfid = v9fs_parent_fid(dentry); 767 if (IS_ERR(dfid)) 768 return ERR_CAST(dfid); 769 770 /* 771 * Make sure we don't use a wrong inode due to parallel 772 * unlink. For cached mode create calls request for new 773 * inode. But with cache disabled, lookup should do this. 774 */ 775 name = dentry->d_name.name; 776 fid = p9_client_walk(dfid, 1, &name, 1); 777 p9_client_clunk(dfid); 778 if (fid == ERR_PTR(-ENOENT)) 779 inode = NULL; 780 else if (IS_ERR(fid)) 781 inode = ERR_CAST(fid); 782 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 783 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 784 else 785 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 786 /* 787 * If we had a rename on the server and a parallel lookup 788 * for the new name, then make sure we instantiate with 789 * the new name. ie look up for a/b, while on server somebody 790 * moved b under k and client parallely did a lookup for 791 * k/b. 792 */ 793 res = d_splice_alias(inode, dentry); 794 if (!IS_ERR(fid)) { 795 if (!res) 796 v9fs_fid_add(dentry, fid); 797 else if (!IS_ERR(res)) 798 v9fs_fid_add(res, fid); 799 else 800 p9_client_clunk(fid); 801 } 802 return res; 803 } 804 805 static int 806 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 807 struct file *file, unsigned int flags, umode_t mode) 808 { 809 int err; 810 u32 perm; 811 struct v9fs_inode *v9inode; 812 struct v9fs_session_info *v9ses; 813 struct p9_fid *fid, *inode_fid; 814 struct dentry *res = NULL; 815 struct inode *inode; 816 817 if (d_in_lookup(dentry)) { 818 res = v9fs_vfs_lookup(dir, dentry, 0); 819 if (IS_ERR(res)) 820 return PTR_ERR(res); 821 822 if (res) 823 dentry = res; 824 } 825 826 /* Only creates */ 827 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 828 return finish_no_open(file, res); 829 830 err = 0; 831 832 v9ses = v9fs_inode2v9ses(dir); 833 perm = unixmode2p9mode(v9ses, mode); 834 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 835 v9fs_uflags2omode(flags, 836 v9fs_proto_dotu(v9ses))); 837 if (IS_ERR(fid)) { 838 err = PTR_ERR(fid); 839 fid = NULL; 840 goto error; 841 } 842 843 v9fs_invalidate_inode_attr(dir); 844 inode = d_inode(dentry); 845 v9inode = V9FS_I(inode); 846 mutex_lock(&v9inode->v_mutex); 847 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 848 !v9inode->writeback_fid && 849 ((flags & O_ACCMODE) != O_RDONLY)) { 850 /* 851 * clone a fid and add it to writeback_fid 852 * we do it during open time instead of 853 * page dirty time via write_begin/page_mkwrite 854 * because we want write after unlink usecase 855 * to work. 856 */ 857 inode_fid = v9fs_writeback_fid(dentry); 858 if (IS_ERR(inode_fid)) { 859 err = PTR_ERR(inode_fid); 860 mutex_unlock(&v9inode->v_mutex); 861 goto error; 862 } 863 v9inode->writeback_fid = (void *) inode_fid; 864 } 865 mutex_unlock(&v9inode->v_mutex); 866 err = finish_open(file, dentry, generic_file_open); 867 if (err) 868 goto error; 869 870 file->private_data = fid; 871 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 872 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 873 v9fs_open_fid_add(inode, fid); 874 875 file->f_mode |= FMODE_CREATED; 876 out: 877 dput(res); 878 return err; 879 880 error: 881 if (fid) 882 p9_client_clunk(fid); 883 goto out; 884 } 885 886 /** 887 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 888 * @i: inode that is being unlinked 889 * @d: dentry that is being unlinked 890 * 891 */ 892 893 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 894 { 895 return v9fs_remove(i, d, 0); 896 } 897 898 /** 899 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 900 * @i: inode that is being unlinked 901 * @d: dentry that is being unlinked 902 * 903 */ 904 905 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 906 { 907 return v9fs_remove(i, d, AT_REMOVEDIR); 908 } 909 910 /** 911 * v9fs_vfs_rename - VFS hook to rename an inode 912 * @mnt_userns: The user namespace of the mount 913 * @old_dir: old dir inode 914 * @old_dentry: old dentry 915 * @new_dir: new dir inode 916 * @new_dentry: new dentry 917 * @flags: RENAME_* flags 918 * 919 */ 920 921 int 922 v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 923 struct dentry *old_dentry, struct inode *new_dir, 924 struct dentry *new_dentry, unsigned int flags) 925 { 926 int retval; 927 struct inode *old_inode; 928 struct inode *new_inode; 929 struct v9fs_session_info *v9ses; 930 struct p9_fid *oldfid, *dfid; 931 struct p9_fid *olddirfid; 932 struct p9_fid *newdirfid; 933 struct p9_wstat wstat; 934 935 if (flags) 936 return -EINVAL; 937 938 p9_debug(P9_DEBUG_VFS, "\n"); 939 retval = 0; 940 old_inode = d_inode(old_dentry); 941 new_inode = d_inode(new_dentry); 942 v9ses = v9fs_inode2v9ses(old_inode); 943 oldfid = v9fs_fid_lookup(old_dentry); 944 if (IS_ERR(oldfid)) 945 return PTR_ERR(oldfid); 946 947 dfid = v9fs_parent_fid(old_dentry); 948 olddirfid = clone_fid(dfid); 949 if (dfid && !IS_ERR(dfid)) 950 p9_client_clunk(dfid); 951 952 if (IS_ERR(olddirfid)) { 953 retval = PTR_ERR(olddirfid); 954 goto done; 955 } 956 957 dfid = v9fs_parent_fid(new_dentry); 958 newdirfid = clone_fid(dfid); 959 p9_client_clunk(dfid); 960 961 if (IS_ERR(newdirfid)) { 962 retval = PTR_ERR(newdirfid); 963 goto clunk_olddir; 964 } 965 966 down_write(&v9ses->rename_sem); 967 if (v9fs_proto_dotl(v9ses)) { 968 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 969 newdirfid, new_dentry->d_name.name); 970 if (retval == -EOPNOTSUPP) 971 retval = p9_client_rename(oldfid, newdirfid, 972 new_dentry->d_name.name); 973 if (retval != -EOPNOTSUPP) 974 goto clunk_newdir; 975 } 976 if (old_dentry->d_parent != new_dentry->d_parent) { 977 /* 978 * 9P .u can only handle file rename in the same directory 979 */ 980 981 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 982 retval = -EXDEV; 983 goto clunk_newdir; 984 } 985 v9fs_blank_wstat(&wstat); 986 wstat.muid = v9ses->uname; 987 wstat.name = new_dentry->d_name.name; 988 retval = p9_client_wstat(oldfid, &wstat); 989 990 clunk_newdir: 991 if (!retval) { 992 if (new_inode) { 993 if (S_ISDIR(new_inode->i_mode)) 994 clear_nlink(new_inode); 995 else 996 v9fs_dec_count(new_inode); 997 } 998 if (S_ISDIR(old_inode->i_mode)) { 999 if (!new_inode) 1000 inc_nlink(new_dir); 1001 v9fs_dec_count(old_dir); 1002 } 1003 v9fs_invalidate_inode_attr(old_inode); 1004 v9fs_invalidate_inode_attr(old_dir); 1005 v9fs_invalidate_inode_attr(new_dir); 1006 1007 /* successful rename */ 1008 d_move(old_dentry, new_dentry); 1009 } 1010 up_write(&v9ses->rename_sem); 1011 p9_client_clunk(newdirfid); 1012 1013 clunk_olddir: 1014 p9_client_clunk(olddirfid); 1015 1016 done: 1017 p9_client_clunk(oldfid); 1018 return retval; 1019 } 1020 1021 /** 1022 * v9fs_vfs_getattr - retrieve file metadata 1023 * @mnt_userns: The user namespace of the mount 1024 * @path: Object to query 1025 * @stat: metadata structure to populate 1026 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1027 * @flags: AT_STATX_xxx setting 1028 * 1029 */ 1030 1031 static int 1032 v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 1033 struct kstat *stat, u32 request_mask, unsigned int flags) 1034 { 1035 struct dentry *dentry = path->dentry; 1036 struct v9fs_session_info *v9ses; 1037 struct p9_fid *fid; 1038 struct p9_wstat *st; 1039 1040 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1041 v9ses = v9fs_dentry2v9ses(dentry); 1042 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1043 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1044 return 0; 1045 } 1046 fid = v9fs_fid_lookup(dentry); 1047 if (IS_ERR(fid)) 1048 return PTR_ERR(fid); 1049 1050 st = p9_client_stat(fid); 1051 p9_client_clunk(fid); 1052 if (IS_ERR(st)) 1053 return PTR_ERR(st); 1054 1055 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1056 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1057 1058 p9stat_free(st); 1059 kfree(st); 1060 return 0; 1061 } 1062 1063 /** 1064 * v9fs_vfs_setattr - set file metadata 1065 * @mnt_userns: The user namespace of the mount 1066 * @dentry: file whose metadata to set 1067 * @iattr: metadata assignment structure 1068 * 1069 */ 1070 1071 static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, 1072 struct dentry *dentry, struct iattr *iattr) 1073 { 1074 int retval, use_dentry = 0; 1075 struct v9fs_session_info *v9ses; 1076 struct p9_fid *fid = NULL; 1077 struct p9_wstat wstat; 1078 1079 p9_debug(P9_DEBUG_VFS, "\n"); 1080 retval = setattr_prepare(&init_user_ns, dentry, iattr); 1081 if (retval) 1082 return retval; 1083 1084 retval = -EPERM; 1085 v9ses = v9fs_dentry2v9ses(dentry); 1086 if (iattr->ia_valid & ATTR_FILE) { 1087 fid = iattr->ia_file->private_data; 1088 WARN_ON(!fid); 1089 } 1090 if (!fid) { 1091 fid = v9fs_fid_lookup(dentry); 1092 use_dentry = 1; 1093 } 1094 if (IS_ERR(fid)) 1095 return PTR_ERR(fid); 1096 1097 v9fs_blank_wstat(&wstat); 1098 if (iattr->ia_valid & ATTR_MODE) 1099 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1100 1101 if (iattr->ia_valid & ATTR_MTIME) 1102 wstat.mtime = iattr->ia_mtime.tv_sec; 1103 1104 if (iattr->ia_valid & ATTR_ATIME) 1105 wstat.atime = iattr->ia_atime.tv_sec; 1106 1107 if (iattr->ia_valid & ATTR_SIZE) 1108 wstat.length = iattr->ia_size; 1109 1110 if (v9fs_proto_dotu(v9ses)) { 1111 if (iattr->ia_valid & ATTR_UID) 1112 wstat.n_uid = iattr->ia_uid; 1113 1114 if (iattr->ia_valid & ATTR_GID) 1115 wstat.n_gid = iattr->ia_gid; 1116 } 1117 1118 /* Write all dirty data */ 1119 if (d_is_reg(dentry)) 1120 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1121 1122 retval = p9_client_wstat(fid, &wstat); 1123 1124 if (use_dentry) 1125 p9_client_clunk(fid); 1126 1127 if (retval < 0) 1128 return retval; 1129 1130 if ((iattr->ia_valid & ATTR_SIZE) && 1131 iattr->ia_size != i_size_read(d_inode(dentry))) 1132 truncate_setsize(d_inode(dentry), iattr->ia_size); 1133 1134 v9fs_invalidate_inode_attr(d_inode(dentry)); 1135 1136 setattr_copy(&init_user_ns, d_inode(dentry), iattr); 1137 mark_inode_dirty(d_inode(dentry)); 1138 return 0; 1139 } 1140 1141 /** 1142 * v9fs_stat2inode - populate an inode structure with mistat info 1143 * @stat: Plan 9 metadata (mistat) structure 1144 * @inode: inode to populate 1145 * @sb: superblock of filesystem 1146 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1147 * 1148 */ 1149 1150 void 1151 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1152 struct super_block *sb, unsigned int flags) 1153 { 1154 umode_t mode; 1155 struct v9fs_session_info *v9ses = sb->s_fs_info; 1156 struct v9fs_inode *v9inode = V9FS_I(inode); 1157 1158 set_nlink(inode, 1); 1159 1160 inode->i_atime.tv_sec = stat->atime; 1161 inode->i_mtime.tv_sec = stat->mtime; 1162 inode->i_ctime.tv_sec = stat->mtime; 1163 1164 inode->i_uid = v9ses->dfltuid; 1165 inode->i_gid = v9ses->dfltgid; 1166 1167 if (v9fs_proto_dotu(v9ses)) { 1168 inode->i_uid = stat->n_uid; 1169 inode->i_gid = stat->n_gid; 1170 } 1171 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1172 if (v9fs_proto_dotu(v9ses)) { 1173 unsigned int i_nlink; 1174 /* 1175 * Hadlink support got added later to the .u extension. 1176 * So there can be a server out there that doesn't 1177 * support this even with .u extension. That would 1178 * just leave us with stat->extension being an empty 1179 * string, though. 1180 */ 1181 /* HARDLINKCOUNT %u */ 1182 if (sscanf(stat->extension, 1183 " HARDLINKCOUNT %u", &i_nlink) == 1) 1184 set_nlink(inode, i_nlink); 1185 } 1186 } 1187 mode = p9mode2perm(v9ses, stat); 1188 mode |= inode->i_mode & ~S_IALLUGO; 1189 inode->i_mode = mode; 1190 1191 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1192 v9fs_i_size_write(inode, stat->length); 1193 /* not real number of blocks, but 512 byte ones ... */ 1194 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1195 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1196 } 1197 1198 /** 1199 * v9fs_qid2ino - convert qid into inode number 1200 * @qid: qid to hash 1201 * 1202 * BUG: potential for inode number collisions? 1203 */ 1204 1205 ino_t v9fs_qid2ino(struct p9_qid *qid) 1206 { 1207 u64 path = qid->path + 2; 1208 ino_t i = 0; 1209 1210 if (sizeof(ino_t) == sizeof(path)) 1211 memcpy(&i, &path, sizeof(ino_t)); 1212 else 1213 i = (ino_t) (path ^ (path >> 32)); 1214 1215 return i; 1216 } 1217 1218 /** 1219 * v9fs_vfs_get_link - follow a symlink path 1220 * @dentry: dentry for symlink 1221 * @inode: inode for symlink 1222 * @done: delayed call for when we are done with the return value 1223 */ 1224 1225 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1226 struct inode *inode, 1227 struct delayed_call *done) 1228 { 1229 struct v9fs_session_info *v9ses; 1230 struct p9_fid *fid; 1231 struct p9_wstat *st; 1232 char *res; 1233 1234 if (!dentry) 1235 return ERR_PTR(-ECHILD); 1236 1237 v9ses = v9fs_dentry2v9ses(dentry); 1238 fid = v9fs_fid_lookup(dentry); 1239 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1240 1241 if (IS_ERR(fid)) 1242 return ERR_CAST(fid); 1243 1244 if (!v9fs_proto_dotu(v9ses)) 1245 return ERR_PTR(-EBADF); 1246 1247 st = p9_client_stat(fid); 1248 p9_client_clunk(fid); 1249 if (IS_ERR(st)) 1250 return ERR_CAST(st); 1251 1252 if (!(st->mode & P9_DMSYMLINK)) { 1253 p9stat_free(st); 1254 kfree(st); 1255 return ERR_PTR(-EINVAL); 1256 } 1257 res = st->extension; 1258 st->extension = NULL; 1259 if (strlen(res) >= PATH_MAX) 1260 res[PATH_MAX - 1] = '\0'; 1261 1262 p9stat_free(st); 1263 kfree(st); 1264 set_delayed_call(done, kfree_link, res); 1265 return res; 1266 } 1267 1268 /** 1269 * v9fs_vfs_mkspecial - create a special file 1270 * @dir: inode to create special file in 1271 * @dentry: dentry to create 1272 * @perm: mode to create special file 1273 * @extension: 9p2000.u format extension string representing special file 1274 * 1275 */ 1276 1277 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1278 u32 perm, const char *extension) 1279 { 1280 struct p9_fid *fid; 1281 struct v9fs_session_info *v9ses; 1282 1283 v9ses = v9fs_inode2v9ses(dir); 1284 if (!v9fs_proto_dotu(v9ses)) { 1285 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1286 return -EPERM; 1287 } 1288 1289 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1290 P9_OREAD); 1291 if (IS_ERR(fid)) 1292 return PTR_ERR(fid); 1293 1294 v9fs_invalidate_inode_attr(dir); 1295 p9_client_clunk(fid); 1296 return 0; 1297 } 1298 1299 /** 1300 * v9fs_vfs_symlink - helper function to create symlinks 1301 * @mnt_userns: The user namespace of the mount 1302 * @dir: directory inode containing symlink 1303 * @dentry: dentry for symlink 1304 * @symname: symlink data 1305 * 1306 * See Also: 9P2000.u RFC for more information 1307 * 1308 */ 1309 1310 static int 1311 v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1312 struct dentry *dentry, const char *symname) 1313 { 1314 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1315 dir->i_ino, dentry, symname); 1316 1317 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1318 } 1319 1320 #define U32_MAX_DIGITS 10 1321 1322 /** 1323 * v9fs_vfs_link - create a hardlink 1324 * @old_dentry: dentry for file to link to 1325 * @dir: inode destination for new link 1326 * @dentry: dentry for link 1327 * 1328 */ 1329 1330 static int 1331 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1332 struct dentry *dentry) 1333 { 1334 int retval; 1335 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1336 struct p9_fid *oldfid; 1337 1338 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1339 dir->i_ino, dentry, old_dentry); 1340 1341 oldfid = v9fs_fid_clone(old_dentry); 1342 if (IS_ERR(oldfid)) 1343 return PTR_ERR(oldfid); 1344 1345 sprintf(name, "%d\n", oldfid->fid); 1346 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1347 if (!retval) { 1348 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1349 v9fs_invalidate_inode_attr(dir); 1350 } 1351 p9_client_clunk(oldfid); 1352 return retval; 1353 } 1354 1355 /** 1356 * v9fs_vfs_mknod - create a special file 1357 * @mnt_userns: The user namespace of the mount 1358 * @dir: inode destination for new link 1359 * @dentry: dentry for file 1360 * @mode: mode for creation 1361 * @rdev: device associated with special file 1362 * 1363 */ 1364 1365 static int 1366 v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1367 struct dentry *dentry, umode_t mode, dev_t rdev) 1368 { 1369 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1370 int retval; 1371 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1372 u32 perm; 1373 1374 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1375 dir->i_ino, dentry, mode, 1376 MAJOR(rdev), MINOR(rdev)); 1377 1378 /* build extension */ 1379 if (S_ISBLK(mode)) 1380 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1381 else if (S_ISCHR(mode)) 1382 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1383 else 1384 *name = 0; 1385 1386 perm = unixmode2p9mode(v9ses, mode); 1387 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1388 1389 return retval; 1390 } 1391 1392 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1393 { 1394 int umode; 1395 dev_t rdev; 1396 struct p9_wstat *st; 1397 struct v9fs_session_info *v9ses; 1398 unsigned int flags; 1399 1400 v9ses = v9fs_inode2v9ses(inode); 1401 st = p9_client_stat(fid); 1402 if (IS_ERR(st)) 1403 return PTR_ERR(st); 1404 /* 1405 * Don't update inode if the file type is different 1406 */ 1407 umode = p9mode2unixmode(v9ses, st, &rdev); 1408 if (inode_wrong_type(inode, umode)) 1409 goto out; 1410 1411 /* 1412 * We don't want to refresh inode->i_size, 1413 * because we may have cached data 1414 */ 1415 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1416 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1417 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1418 out: 1419 p9stat_free(st); 1420 kfree(st); 1421 return 0; 1422 } 1423 1424 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1425 .create = v9fs_vfs_create, 1426 .lookup = v9fs_vfs_lookup, 1427 .atomic_open = v9fs_vfs_atomic_open, 1428 .symlink = v9fs_vfs_symlink, 1429 .link = v9fs_vfs_link, 1430 .unlink = v9fs_vfs_unlink, 1431 .mkdir = v9fs_vfs_mkdir, 1432 .rmdir = v9fs_vfs_rmdir, 1433 .mknod = v9fs_vfs_mknod, 1434 .rename = v9fs_vfs_rename, 1435 .getattr = v9fs_vfs_getattr, 1436 .setattr = v9fs_vfs_setattr, 1437 }; 1438 1439 static const struct inode_operations v9fs_dir_inode_operations = { 1440 .create = v9fs_vfs_create, 1441 .lookup = v9fs_vfs_lookup, 1442 .atomic_open = v9fs_vfs_atomic_open, 1443 .unlink = v9fs_vfs_unlink, 1444 .mkdir = v9fs_vfs_mkdir, 1445 .rmdir = v9fs_vfs_rmdir, 1446 .mknod = v9fs_vfs_mknod, 1447 .rename = v9fs_vfs_rename, 1448 .getattr = v9fs_vfs_getattr, 1449 .setattr = v9fs_vfs_setattr, 1450 }; 1451 1452 static const struct inode_operations v9fs_file_inode_operations = { 1453 .getattr = v9fs_vfs_getattr, 1454 .setattr = v9fs_vfs_setattr, 1455 }; 1456 1457 static const struct inode_operations v9fs_symlink_inode_operations = { 1458 .get_link = v9fs_vfs_get_link, 1459 .getattr = v9fs_vfs_getattr, 1460 .setattr = v9fs_vfs_setattr, 1461 }; 1462 1463