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/sched.h> 21 #include <linux/slab.h> 22 #include <linux/xattr.h> 23 #include <linux/posix_acl.h> 24 #include <net/9p/9p.h> 25 #include <net/9p/client.h> 26 27 #include "v9fs.h" 28 #include "v9fs_vfs.h" 29 #include "fid.h" 30 #include "cache.h" 31 #include "xattr.h" 32 #include "acl.h" 33 34 static const struct inode_operations v9fs_dir_inode_operations; 35 static const struct inode_operations v9fs_dir_inode_operations_dotu; 36 static const struct inode_operations v9fs_file_inode_operations; 37 static const struct inode_operations v9fs_symlink_inode_operations; 38 39 /** 40 * unixmode2p9mode - convert unix mode bits to plan 9 41 * @v9ses: v9fs session information 42 * @mode: mode to convert 43 * 44 */ 45 46 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 47 { 48 int res; 49 50 res = mode & 0777; 51 if (S_ISDIR(mode)) 52 res |= P9_DMDIR; 53 if (v9fs_proto_dotu(v9ses)) { 54 if (v9ses->nodev == 0) { 55 if (S_ISSOCK(mode)) 56 res |= P9_DMSOCKET; 57 if (S_ISFIFO(mode)) 58 res |= P9_DMNAMEDPIPE; 59 if (S_ISBLK(mode)) 60 res |= P9_DMDEVICE; 61 if (S_ISCHR(mode)) 62 res |= P9_DMDEVICE; 63 } 64 65 if ((mode & S_ISUID) == S_ISUID) 66 res |= P9_DMSETUID; 67 if ((mode & S_ISGID) == S_ISGID) 68 res |= P9_DMSETGID; 69 if ((mode & S_ISVTX) == S_ISVTX) 70 res |= P9_DMSETVTX; 71 } 72 return res; 73 } 74 75 /** 76 * p9mode2perm- convert plan9 mode bits to unix permission bits 77 * @v9ses: v9fs session information 78 * @stat: p9_wstat from which mode need to be derived 79 * 80 */ 81 static int p9mode2perm(struct v9fs_session_info *v9ses, 82 struct p9_wstat *stat) 83 { 84 int res; 85 int mode = stat->mode; 86 87 res = mode & S_IALLUGO; 88 if (v9fs_proto_dotu(v9ses)) { 89 if ((mode & P9_DMSETUID) == P9_DMSETUID) 90 res |= S_ISUID; 91 92 if ((mode & P9_DMSETGID) == P9_DMSETGID) 93 res |= S_ISGID; 94 95 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 96 res |= S_ISVTX; 97 } 98 return res; 99 } 100 101 /** 102 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 103 * @v9ses: v9fs session information 104 * @stat: p9_wstat from which mode need to be derived 105 * @rdev: major number, minor number in case of device files. 106 * 107 */ 108 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 109 struct p9_wstat *stat, dev_t *rdev) 110 { 111 int res, r; 112 u32 mode = stat->mode; 113 114 *rdev = 0; 115 res = p9mode2perm(v9ses, stat); 116 117 if ((mode & P9_DMDIR) == P9_DMDIR) 118 res |= S_IFDIR; 119 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 120 res |= S_IFLNK; 121 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 122 && (v9ses->nodev == 0)) 123 res |= S_IFSOCK; 124 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 125 && (v9ses->nodev == 0)) 126 res |= S_IFIFO; 127 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 128 && (v9ses->nodev == 0)) { 129 char type = 0; 130 int major = -1, minor = -1; 131 132 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor); 133 if (r != 3) { 134 p9_debug(P9_DEBUG_ERROR, 135 "invalid device string, umode will be bogus: %s\n", 136 stat->extension); 137 return res; 138 } 139 switch (type) { 140 case 'c': 141 res |= S_IFCHR; 142 break; 143 case 'b': 144 res |= S_IFBLK; 145 break; 146 default: 147 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 148 type, stat->extension); 149 } 150 *rdev = MKDEV(major, minor); 151 } else 152 res |= S_IFREG; 153 154 return res; 155 } 156 157 /** 158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 159 * @uflags: flags to convert 160 * @extended: if .u extensions are active 161 */ 162 163 int v9fs_uflags2omode(int uflags, int extended) 164 { 165 int ret; 166 167 ret = 0; 168 switch (uflags&3) { 169 default: 170 case O_RDONLY: 171 ret = P9_OREAD; 172 break; 173 174 case O_WRONLY: 175 ret = P9_OWRITE; 176 break; 177 178 case O_RDWR: 179 ret = P9_ORDWR; 180 break; 181 } 182 183 if (extended) { 184 if (uflags & O_EXCL) 185 ret |= P9_OEXCL; 186 187 if (uflags & O_APPEND) 188 ret |= P9_OAPPEND; 189 } 190 191 return ret; 192 } 193 194 /** 195 * v9fs_blank_wstat - helper function to setup a 9P stat structure 196 * @wstat: structure to initialize 197 * 198 */ 199 200 void 201 v9fs_blank_wstat(struct p9_wstat *wstat) 202 { 203 wstat->type = ~0; 204 wstat->dev = ~0; 205 wstat->qid.type = ~0; 206 wstat->qid.version = ~0; 207 *((long long *)&wstat->qid.path) = ~0; 208 wstat->mode = ~0; 209 wstat->atime = ~0; 210 wstat->mtime = ~0; 211 wstat->length = ~0; 212 wstat->name = NULL; 213 wstat->uid = NULL; 214 wstat->gid = NULL; 215 wstat->muid = NULL; 216 wstat->n_uid = INVALID_UID; 217 wstat->n_gid = INVALID_GID; 218 wstat->n_muid = INVALID_UID; 219 wstat->extension = NULL; 220 } 221 222 /** 223 * v9fs_alloc_inode - helper function to allocate an inode 224 * @sb: The superblock to allocate the inode from 225 */ 226 struct inode *v9fs_alloc_inode(struct super_block *sb) 227 { 228 struct v9fs_inode *v9inode; 229 230 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL); 231 if (!v9inode) 232 return NULL; 233 v9inode->writeback_fid = NULL; 234 v9inode->cache_validity = 0; 235 mutex_init(&v9inode->v_mutex); 236 return &v9inode->netfs.inode; 237 } 238 239 /** 240 * v9fs_free_inode - destroy an inode 241 * @inode: The inode to be freed 242 */ 243 244 void v9fs_free_inode(struct inode *inode) 245 { 246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 247 } 248 249 /* 250 * Set parameters for the netfs library 251 */ 252 static void v9fs_set_netfs_context(struct inode *inode) 253 { 254 struct v9fs_inode *v9inode = V9FS_I(inode); 255 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops); 256 } 257 258 int v9fs_init_inode(struct v9fs_session_info *v9ses, 259 struct inode *inode, umode_t mode, dev_t rdev) 260 { 261 int err = 0; 262 263 inode_init_owner(&nop_mnt_idmap, inode, NULL, mode); 264 inode->i_blocks = 0; 265 inode->i_rdev = rdev; 266 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 267 inode->i_mapping->a_ops = &v9fs_addr_operations; 268 inode->i_private = NULL; 269 270 switch (mode & S_IFMT) { 271 case S_IFIFO: 272 case S_IFBLK: 273 case S_IFCHR: 274 case S_IFSOCK: 275 if (v9fs_proto_dotl(v9ses)) { 276 inode->i_op = &v9fs_file_inode_operations_dotl; 277 } else if (v9fs_proto_dotu(v9ses)) { 278 inode->i_op = &v9fs_file_inode_operations; 279 } else { 280 p9_debug(P9_DEBUG_ERROR, 281 "special files without extended mode\n"); 282 err = -EINVAL; 283 goto error; 284 } 285 init_special_inode(inode, inode->i_mode, inode->i_rdev); 286 break; 287 case S_IFREG: 288 if (v9fs_proto_dotl(v9ses)) { 289 inode->i_op = &v9fs_file_inode_operations_dotl; 290 if (v9ses->cache == CACHE_LOOSE || 291 v9ses->cache == CACHE_FSCACHE) 292 inode->i_fop = 293 &v9fs_cached_file_operations_dotl; 294 else if (v9ses->cache == CACHE_MMAP) 295 inode->i_fop = &v9fs_mmap_file_operations_dotl; 296 else 297 inode->i_fop = &v9fs_file_operations_dotl; 298 } else { 299 inode->i_op = &v9fs_file_inode_operations; 300 if (v9ses->cache == CACHE_LOOSE || 301 v9ses->cache == CACHE_FSCACHE) 302 inode->i_fop = 303 &v9fs_cached_file_operations; 304 else if (v9ses->cache == CACHE_MMAP) 305 inode->i_fop = &v9fs_mmap_file_operations; 306 else 307 inode->i_fop = &v9fs_file_operations; 308 } 309 310 break; 311 case S_IFLNK: 312 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 313 p9_debug(P9_DEBUG_ERROR, 314 "extended modes used with legacy protocol\n"); 315 err = -EINVAL; 316 goto error; 317 } 318 319 if (v9fs_proto_dotl(v9ses)) 320 inode->i_op = &v9fs_symlink_inode_operations_dotl; 321 else 322 inode->i_op = &v9fs_symlink_inode_operations; 323 324 break; 325 case S_IFDIR: 326 inc_nlink(inode); 327 if (v9fs_proto_dotl(v9ses)) 328 inode->i_op = &v9fs_dir_inode_operations_dotl; 329 else if (v9fs_proto_dotu(v9ses)) 330 inode->i_op = &v9fs_dir_inode_operations_dotu; 331 else 332 inode->i_op = &v9fs_dir_inode_operations; 333 334 if (v9fs_proto_dotl(v9ses)) 335 inode->i_fop = &v9fs_dir_operations_dotl; 336 else 337 inode->i_fop = &v9fs_dir_operations; 338 339 break; 340 default: 341 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 342 mode, mode & S_IFMT); 343 err = -EINVAL; 344 goto error; 345 } 346 347 v9fs_set_netfs_context(inode); 348 error: 349 return err; 350 351 } 352 353 /** 354 * v9fs_get_inode - helper function to setup an inode 355 * @sb: superblock 356 * @mode: mode to setup inode with 357 * @rdev: The device numbers to set 358 */ 359 360 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 361 { 362 int err; 363 struct inode *inode; 364 struct v9fs_session_info *v9ses = sb->s_fs_info; 365 366 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 367 368 inode = new_inode(sb); 369 if (!inode) { 370 pr_warn("%s (%d): Problem allocating inode\n", 371 __func__, task_pid_nr(current)); 372 return ERR_PTR(-ENOMEM); 373 } 374 err = v9fs_init_inode(v9ses, inode, mode, rdev); 375 if (err) { 376 iput(inode); 377 return ERR_PTR(err); 378 } 379 return inode; 380 } 381 382 /** 383 * v9fs_evict_inode - Remove an inode from the inode cache 384 * @inode: inode to release 385 * 386 */ 387 void v9fs_evict_inode(struct inode *inode) 388 { 389 struct v9fs_inode *v9inode = V9FS_I(inode); 390 __le32 version; 391 392 truncate_inode_pages_final(&inode->i_data); 393 version = cpu_to_le32(v9inode->qid.version); 394 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode, 395 &version); 396 clear_inode(inode); 397 filemap_fdatawrite(&inode->i_data); 398 399 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); 400 /* clunk the fid stashed in writeback_fid */ 401 p9_fid_put(v9inode->writeback_fid); 402 v9inode->writeback_fid = NULL; 403 } 404 405 static int v9fs_test_inode(struct inode *inode, void *data) 406 { 407 int umode; 408 dev_t rdev; 409 struct v9fs_inode *v9inode = V9FS_I(inode); 410 struct p9_wstat *st = (struct p9_wstat *)data; 411 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 412 413 umode = p9mode2unixmode(v9ses, st, &rdev); 414 /* don't match inode of different type */ 415 if (inode_wrong_type(inode, umode)) 416 return 0; 417 418 /* compare qid details */ 419 if (memcmp(&v9inode->qid.version, 420 &st->qid.version, sizeof(v9inode->qid.version))) 421 return 0; 422 423 if (v9inode->qid.type != st->qid.type) 424 return 0; 425 426 if (v9inode->qid.path != st->qid.path) 427 return 0; 428 return 1; 429 } 430 431 static int v9fs_test_new_inode(struct inode *inode, void *data) 432 { 433 return 0; 434 } 435 436 static int v9fs_set_inode(struct inode *inode, void *data) 437 { 438 struct v9fs_inode *v9inode = V9FS_I(inode); 439 struct p9_wstat *st = (struct p9_wstat *)data; 440 441 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 442 return 0; 443 } 444 445 static struct inode *v9fs_qid_iget(struct super_block *sb, 446 struct p9_qid *qid, 447 struct p9_wstat *st, 448 int new) 449 { 450 dev_t rdev; 451 int retval; 452 umode_t umode; 453 unsigned long i_ino; 454 struct inode *inode; 455 struct v9fs_session_info *v9ses = sb->s_fs_info; 456 int (*test)(struct inode *inode, void *data); 457 458 if (new) 459 test = v9fs_test_new_inode; 460 else 461 test = v9fs_test_inode; 462 463 i_ino = v9fs_qid2ino(qid); 464 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 465 if (!inode) 466 return ERR_PTR(-ENOMEM); 467 if (!(inode->i_state & I_NEW)) 468 return inode; 469 /* 470 * initialize the inode with the stat info 471 * FIXME!! we may need support for stale inodes 472 * later. 473 */ 474 inode->i_ino = i_ino; 475 umode = p9mode2unixmode(v9ses, st, &rdev); 476 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 477 if (retval) 478 goto error; 479 480 v9fs_stat2inode(st, inode, sb, 0); 481 v9fs_cache_inode_get_cookie(inode); 482 unlock_new_inode(inode); 483 return inode; 484 error: 485 iget_failed(inode); 486 return ERR_PTR(retval); 487 488 } 489 490 struct inode * 491 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 492 struct super_block *sb, int new) 493 { 494 struct p9_wstat *st; 495 struct inode *inode = NULL; 496 497 st = p9_client_stat(fid); 498 if (IS_ERR(st)) 499 return ERR_CAST(st); 500 501 inode = v9fs_qid_iget(sb, &st->qid, st, new); 502 p9stat_free(st); 503 kfree(st); 504 return inode; 505 } 506 507 /** 508 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 509 * plan 9 AT flag. 510 * @flags: flags to convert 511 */ 512 static int v9fs_at_to_dotl_flags(int flags) 513 { 514 int rflags = 0; 515 516 if (flags & AT_REMOVEDIR) 517 rflags |= P9_DOTL_AT_REMOVEDIR; 518 519 return rflags; 520 } 521 522 /** 523 * v9fs_dec_count - helper functon to drop i_nlink. 524 * 525 * If a directory had nlink <= 2 (including . and ..), then we should not drop 526 * the link count, which indicates the underlying exported fs doesn't maintain 527 * nlink accurately. e.g. 528 * - overlayfs sets nlink to 1 for merged dir 529 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 530 * than EXT4_LINK_MAX (65000) links. 531 * 532 * @inode: inode whose nlink is being dropped 533 */ 534 static void v9fs_dec_count(struct inode *inode) 535 { 536 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 537 drop_nlink(inode); 538 } 539 540 /** 541 * v9fs_remove - helper function to remove files and directories 542 * @dir: directory inode that is being deleted 543 * @dentry: dentry that is being deleted 544 * @flags: removing a directory 545 * 546 */ 547 548 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 549 { 550 struct inode *inode; 551 int retval = -EOPNOTSUPP; 552 struct p9_fid *v9fid, *dfid; 553 struct v9fs_session_info *v9ses; 554 555 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 556 dir, dentry, flags); 557 558 v9ses = v9fs_inode2v9ses(dir); 559 inode = d_inode(dentry); 560 dfid = v9fs_parent_fid(dentry); 561 if (IS_ERR(dfid)) { 562 retval = PTR_ERR(dfid); 563 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 564 return retval; 565 } 566 if (v9fs_proto_dotl(v9ses)) 567 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 568 v9fs_at_to_dotl_flags(flags)); 569 p9_fid_put(dfid); 570 if (retval == -EOPNOTSUPP) { 571 /* Try the one based on path */ 572 v9fid = v9fs_fid_clone(dentry); 573 if (IS_ERR(v9fid)) 574 return PTR_ERR(v9fid); 575 retval = p9_client_remove(v9fid); 576 } 577 if (!retval) { 578 /* 579 * directories on unlink should have zero 580 * link count 581 */ 582 if (flags & AT_REMOVEDIR) { 583 clear_nlink(inode); 584 v9fs_dec_count(dir); 585 } else 586 v9fs_dec_count(inode); 587 588 v9fs_invalidate_inode_attr(inode); 589 v9fs_invalidate_inode_attr(dir); 590 591 /* invalidate all fids associated with dentry */ 592 /* NOTE: This will not include open fids */ 593 dentry->d_op->d_release(dentry); 594 } 595 return retval; 596 } 597 598 /** 599 * v9fs_create - Create a file 600 * @v9ses: session information 601 * @dir: directory that dentry is being created in 602 * @dentry: dentry that is being created 603 * @extension: 9p2000.u extension string to support devices, etc. 604 * @perm: create permissions 605 * @mode: open mode 606 * 607 */ 608 static struct p9_fid * 609 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 610 struct dentry *dentry, char *extension, u32 perm, u8 mode) 611 { 612 int err; 613 const unsigned char *name; 614 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 615 struct inode *inode; 616 617 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 618 619 err = 0; 620 name = dentry->d_name.name; 621 dfid = v9fs_parent_fid(dentry); 622 if (IS_ERR(dfid)) { 623 err = PTR_ERR(dfid); 624 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 625 return ERR_PTR(err); 626 } 627 628 /* clone a fid to use for creation */ 629 ofid = clone_fid(dfid); 630 if (IS_ERR(ofid)) { 631 err = PTR_ERR(ofid); 632 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 633 goto error; 634 } 635 636 err = p9_client_fcreate(ofid, name, perm, mode, extension); 637 if (err < 0) { 638 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 639 goto error; 640 } 641 642 if (!(perm & P9_DMLINK)) { 643 /* now walk from the parent so we can get unopened fid */ 644 fid = p9_client_walk(dfid, 1, &name, 1); 645 if (IS_ERR(fid)) { 646 err = PTR_ERR(fid); 647 p9_debug(P9_DEBUG_VFS, 648 "p9_client_walk failed %d\n", err); 649 goto error; 650 } 651 /* 652 * instantiate inode and assign the unopened fid to the dentry 653 */ 654 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 655 if (IS_ERR(inode)) { 656 err = PTR_ERR(inode); 657 p9_debug(P9_DEBUG_VFS, 658 "inode creation failed %d\n", err); 659 goto error; 660 } 661 v9fs_fid_add(dentry, &fid); 662 d_instantiate(dentry, inode); 663 } 664 p9_fid_put(dfid); 665 return ofid; 666 error: 667 p9_fid_put(dfid); 668 p9_fid_put(ofid); 669 p9_fid_put(fid); 670 return ERR_PTR(err); 671 } 672 673 /** 674 * v9fs_vfs_create - VFS hook to create a regular file 675 * @idmap: idmap 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 mnt_idmap *idmap, 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_fid_put(fid); 701 702 return 0; 703 } 704 705 /** 706 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 707 * @idmap: idmap 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 mnt_idmap *idmap, 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_fid_put(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_fid_put(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_fid_put(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 goto error; 840 } 841 842 v9fs_invalidate_inode_attr(dir); 843 inode = d_inode(dentry); 844 v9inode = V9FS_I(inode); 845 mutex_lock(&v9inode->v_mutex); 846 if ((v9ses->cache) && !v9inode->writeback_fid && 847 ((flags & O_ACCMODE) != O_RDONLY)) { 848 /* 849 * clone a fid and add it to writeback_fid 850 * we do it during open time instead of 851 * page dirty time via write_begin/page_mkwrite 852 * because we want write after unlink usecase 853 * to work. 854 */ 855 inode_fid = v9fs_writeback_fid(dentry); 856 if (IS_ERR(inode_fid)) { 857 err = PTR_ERR(inode_fid); 858 mutex_unlock(&v9inode->v_mutex); 859 goto error; 860 } 861 v9inode->writeback_fid = (void *) inode_fid; 862 } 863 mutex_unlock(&v9inode->v_mutex); 864 err = finish_open(file, dentry, generic_file_open); 865 if (err) 866 goto error; 867 868 file->private_data = fid; 869 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 870 fscache_use_cookie(v9fs_inode_cookie(v9inode), 871 file->f_mode & FMODE_WRITE); 872 v9fs_open_fid_add(inode, &fid); 873 874 file->f_mode |= FMODE_CREATED; 875 out: 876 dput(res); 877 return err; 878 879 error: 880 p9_fid_put(fid); 881 goto out; 882 } 883 884 /** 885 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 886 * @i: inode that is being unlinked 887 * @d: dentry that is being unlinked 888 * 889 */ 890 891 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 892 { 893 return v9fs_remove(i, d, 0); 894 } 895 896 /** 897 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 898 * @i: inode that is being unlinked 899 * @d: dentry that is being unlinked 900 * 901 */ 902 903 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 904 { 905 return v9fs_remove(i, d, AT_REMOVEDIR); 906 } 907 908 /** 909 * v9fs_vfs_rename - VFS hook to rename an inode 910 * @idmap: The idmap of the mount 911 * @old_dir: old dir inode 912 * @old_dentry: old dentry 913 * @new_dir: new dir inode 914 * @new_dentry: new dentry 915 * @flags: RENAME_* flags 916 * 917 */ 918 919 int 920 v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 921 struct dentry *old_dentry, struct inode *new_dir, 922 struct dentry *new_dentry, unsigned int flags) 923 { 924 int retval; 925 struct inode *old_inode; 926 struct inode *new_inode; 927 struct v9fs_session_info *v9ses; 928 struct p9_fid *oldfid = NULL, *dfid = NULL; 929 struct p9_fid *olddirfid = NULL; 930 struct p9_fid *newdirfid = NULL; 931 struct p9_wstat wstat; 932 933 if (flags) 934 return -EINVAL; 935 936 p9_debug(P9_DEBUG_VFS, "\n"); 937 retval = 0; 938 old_inode = d_inode(old_dentry); 939 new_inode = d_inode(new_dentry); 940 v9ses = v9fs_inode2v9ses(old_inode); 941 oldfid = v9fs_fid_lookup(old_dentry); 942 if (IS_ERR(oldfid)) 943 return PTR_ERR(oldfid); 944 945 dfid = v9fs_parent_fid(old_dentry); 946 olddirfid = clone_fid(dfid); 947 p9_fid_put(dfid); 948 dfid = NULL; 949 950 if (IS_ERR(olddirfid)) { 951 retval = PTR_ERR(olddirfid); 952 goto error; 953 } 954 955 dfid = v9fs_parent_fid(new_dentry); 956 newdirfid = clone_fid(dfid); 957 p9_fid_put(dfid); 958 dfid = NULL; 959 960 if (IS_ERR(newdirfid)) { 961 retval = PTR_ERR(newdirfid); 962 goto error; 963 } 964 965 down_write(&v9ses->rename_sem); 966 if (v9fs_proto_dotl(v9ses)) { 967 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 968 newdirfid, new_dentry->d_name.name); 969 if (retval == -EOPNOTSUPP) 970 retval = p9_client_rename(oldfid, newdirfid, 971 new_dentry->d_name.name); 972 if (retval != -EOPNOTSUPP) 973 goto error_locked; 974 } 975 if (old_dentry->d_parent != new_dentry->d_parent) { 976 /* 977 * 9P .u can only handle file rename in the same directory 978 */ 979 980 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 981 retval = -EXDEV; 982 goto error_locked; 983 } 984 v9fs_blank_wstat(&wstat); 985 wstat.muid = v9ses->uname; 986 wstat.name = new_dentry->d_name.name; 987 retval = p9_client_wstat(oldfid, &wstat); 988 989 error_locked: 990 if (!retval) { 991 if (new_inode) { 992 if (S_ISDIR(new_inode->i_mode)) 993 clear_nlink(new_inode); 994 else 995 v9fs_dec_count(new_inode); 996 } 997 if (S_ISDIR(old_inode->i_mode)) { 998 if (!new_inode) 999 inc_nlink(new_dir); 1000 v9fs_dec_count(old_dir); 1001 } 1002 v9fs_invalidate_inode_attr(old_inode); 1003 v9fs_invalidate_inode_attr(old_dir); 1004 v9fs_invalidate_inode_attr(new_dir); 1005 1006 /* successful rename */ 1007 d_move(old_dentry, new_dentry); 1008 } 1009 up_write(&v9ses->rename_sem); 1010 1011 error: 1012 p9_fid_put(newdirfid); 1013 p9_fid_put(olddirfid); 1014 p9_fid_put(oldfid); 1015 return retval; 1016 } 1017 1018 /** 1019 * v9fs_vfs_getattr - retrieve file metadata 1020 * @idmap: idmap of the mount 1021 * @path: Object to query 1022 * @stat: metadata structure to populate 1023 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1024 * @flags: AT_STATX_xxx setting 1025 * 1026 */ 1027 1028 static int 1029 v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path, 1030 struct kstat *stat, u32 request_mask, unsigned int flags) 1031 { 1032 struct dentry *dentry = path->dentry; 1033 struct v9fs_session_info *v9ses; 1034 struct p9_fid *fid; 1035 struct p9_wstat *st; 1036 1037 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1038 v9ses = v9fs_dentry2v9ses(dentry); 1039 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1040 generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat); 1041 return 0; 1042 } 1043 fid = v9fs_fid_lookup(dentry); 1044 if (IS_ERR(fid)) 1045 return PTR_ERR(fid); 1046 1047 st = p9_client_stat(fid); 1048 p9_fid_put(fid); 1049 if (IS_ERR(st)) 1050 return PTR_ERR(st); 1051 1052 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1053 generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat); 1054 1055 p9stat_free(st); 1056 kfree(st); 1057 return 0; 1058 } 1059 1060 /** 1061 * v9fs_vfs_setattr - set file metadata 1062 * @idmap: idmap of the mount 1063 * @dentry: file whose metadata to set 1064 * @iattr: metadata assignment structure 1065 * 1066 */ 1067 1068 static int v9fs_vfs_setattr(struct mnt_idmap *idmap, 1069 struct dentry *dentry, struct iattr *iattr) 1070 { 1071 int retval, use_dentry = 0; 1072 struct inode *inode = d_inode(dentry); 1073 struct v9fs_inode *v9inode = V9FS_I(inode); 1074 struct v9fs_session_info *v9ses; 1075 struct p9_fid *fid = NULL; 1076 struct p9_wstat wstat; 1077 1078 p9_debug(P9_DEBUG_VFS, "\n"); 1079 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); 1080 if (retval) 1081 return retval; 1082 1083 retval = -EPERM; 1084 v9ses = v9fs_dentry2v9ses(dentry); 1085 if (iattr->ia_valid & ATTR_FILE) { 1086 fid = iattr->ia_file->private_data; 1087 WARN_ON(!fid); 1088 } 1089 if (!fid) { 1090 fid = v9fs_fid_lookup(dentry); 1091 use_dentry = 1; 1092 } 1093 if (IS_ERR(fid)) 1094 return PTR_ERR(fid); 1095 1096 v9fs_blank_wstat(&wstat); 1097 if (iattr->ia_valid & ATTR_MODE) 1098 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1099 1100 if (iattr->ia_valid & ATTR_MTIME) 1101 wstat.mtime = iattr->ia_mtime.tv_sec; 1102 1103 if (iattr->ia_valid & ATTR_ATIME) 1104 wstat.atime = iattr->ia_atime.tv_sec; 1105 1106 if (iattr->ia_valid & ATTR_SIZE) 1107 wstat.length = iattr->ia_size; 1108 1109 if (v9fs_proto_dotu(v9ses)) { 1110 if (iattr->ia_valid & ATTR_UID) 1111 wstat.n_uid = iattr->ia_uid; 1112 1113 if (iattr->ia_valid & ATTR_GID) 1114 wstat.n_gid = iattr->ia_gid; 1115 } 1116 1117 /* Write all dirty data */ 1118 if (d_is_reg(dentry)) 1119 filemap_write_and_wait(inode->i_mapping); 1120 1121 retval = p9_client_wstat(fid, &wstat); 1122 1123 if (use_dentry) 1124 p9_fid_put(fid); 1125 1126 if (retval < 0) 1127 return retval; 1128 1129 if ((iattr->ia_valid & ATTR_SIZE) && 1130 iattr->ia_size != i_size_read(inode)) { 1131 truncate_setsize(inode, iattr->ia_size); 1132 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1133 } 1134 1135 v9fs_invalidate_inode_attr(inode); 1136 1137 setattr_copy(&nop_mnt_idmap, inode, iattr); 1138 mark_inode_dirty(inode); 1139 return 0; 1140 } 1141 1142 /** 1143 * v9fs_stat2inode - populate an inode structure with mistat info 1144 * @stat: Plan 9 metadata (mistat) structure 1145 * @inode: inode to populate 1146 * @sb: superblock of filesystem 1147 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1148 * 1149 */ 1150 1151 void 1152 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1153 struct super_block *sb, unsigned int flags) 1154 { 1155 umode_t mode; 1156 struct v9fs_session_info *v9ses = sb->s_fs_info; 1157 struct v9fs_inode *v9inode = V9FS_I(inode); 1158 1159 set_nlink(inode, 1); 1160 1161 inode->i_atime.tv_sec = stat->atime; 1162 inode->i_mtime.tv_sec = stat->mtime; 1163 inode->i_ctime.tv_sec = stat->mtime; 1164 1165 inode->i_uid = v9ses->dfltuid; 1166 inode->i_gid = v9ses->dfltgid; 1167 1168 if (v9fs_proto_dotu(v9ses)) { 1169 inode->i_uid = stat->n_uid; 1170 inode->i_gid = stat->n_gid; 1171 } 1172 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1173 if (v9fs_proto_dotu(v9ses)) { 1174 unsigned int i_nlink; 1175 /* 1176 * Hadlink support got added later to the .u extension. 1177 * So there can be a server out there that doesn't 1178 * support this even with .u extension. That would 1179 * just leave us with stat->extension being an empty 1180 * string, though. 1181 */ 1182 /* HARDLINKCOUNT %u */ 1183 if (sscanf(stat->extension, 1184 " HARDLINKCOUNT %u", &i_nlink) == 1) 1185 set_nlink(inode, i_nlink); 1186 } 1187 } 1188 mode = p9mode2perm(v9ses, stat); 1189 mode |= inode->i_mode & ~S_IALLUGO; 1190 inode->i_mode = mode; 1191 1192 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1193 v9fs_i_size_write(inode, stat->length); 1194 /* not real number of blocks, but 512 byte ones ... */ 1195 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1196 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1197 } 1198 1199 /** 1200 * v9fs_qid2ino - convert qid into inode number 1201 * @qid: qid to hash 1202 * 1203 * BUG: potential for inode number collisions? 1204 */ 1205 1206 ino_t v9fs_qid2ino(struct p9_qid *qid) 1207 { 1208 u64 path = qid->path + 2; 1209 ino_t i = 0; 1210 1211 if (sizeof(ino_t) == sizeof(path)) 1212 memcpy(&i, &path, sizeof(ino_t)); 1213 else 1214 i = (ino_t) (path ^ (path >> 32)); 1215 1216 return i; 1217 } 1218 1219 /** 1220 * v9fs_vfs_get_link - follow a symlink path 1221 * @dentry: dentry for symlink 1222 * @inode: inode for symlink 1223 * @done: delayed call for when we are done with the return value 1224 */ 1225 1226 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1227 struct inode *inode, 1228 struct delayed_call *done) 1229 { 1230 struct v9fs_session_info *v9ses; 1231 struct p9_fid *fid; 1232 struct p9_wstat *st; 1233 char *res; 1234 1235 if (!dentry) 1236 return ERR_PTR(-ECHILD); 1237 1238 v9ses = v9fs_dentry2v9ses(dentry); 1239 if (!v9fs_proto_dotu(v9ses)) 1240 return ERR_PTR(-EBADF); 1241 1242 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1243 fid = v9fs_fid_lookup(dentry); 1244 1245 if (IS_ERR(fid)) 1246 return ERR_CAST(fid); 1247 1248 st = p9_client_stat(fid); 1249 p9_fid_put(fid); 1250 if (IS_ERR(st)) 1251 return ERR_CAST(st); 1252 1253 if (!(st->mode & P9_DMSYMLINK)) { 1254 p9stat_free(st); 1255 kfree(st); 1256 return ERR_PTR(-EINVAL); 1257 } 1258 res = st->extension; 1259 st->extension = NULL; 1260 if (strlen(res) >= PATH_MAX) 1261 res[PATH_MAX - 1] = '\0'; 1262 1263 p9stat_free(st); 1264 kfree(st); 1265 set_delayed_call(done, kfree_link, res); 1266 return res; 1267 } 1268 1269 /** 1270 * v9fs_vfs_mkspecial - create a special file 1271 * @dir: inode to create special file in 1272 * @dentry: dentry to create 1273 * @perm: mode to create special file 1274 * @extension: 9p2000.u format extension string representing special file 1275 * 1276 */ 1277 1278 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1279 u32 perm, const char *extension) 1280 { 1281 struct p9_fid *fid; 1282 struct v9fs_session_info *v9ses; 1283 1284 v9ses = v9fs_inode2v9ses(dir); 1285 if (!v9fs_proto_dotu(v9ses)) { 1286 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1287 return -EPERM; 1288 } 1289 1290 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1291 P9_OREAD); 1292 if (IS_ERR(fid)) 1293 return PTR_ERR(fid); 1294 1295 v9fs_invalidate_inode_attr(dir); 1296 p9_fid_put(fid); 1297 return 0; 1298 } 1299 1300 /** 1301 * v9fs_vfs_symlink - helper function to create symlinks 1302 * @idmap: idmap of the mount 1303 * @dir: directory inode containing symlink 1304 * @dentry: dentry for symlink 1305 * @symname: symlink data 1306 * 1307 * See Also: 9P2000.u RFC for more information 1308 * 1309 */ 1310 1311 static int 1312 v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir, 1313 struct dentry *dentry, const char *symname) 1314 { 1315 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1316 dir->i_ino, dentry, symname); 1317 1318 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1319 } 1320 1321 #define U32_MAX_DIGITS 10 1322 1323 /** 1324 * v9fs_vfs_link - create a hardlink 1325 * @old_dentry: dentry for file to link to 1326 * @dir: inode destination for new link 1327 * @dentry: dentry for link 1328 * 1329 */ 1330 1331 static int 1332 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1333 struct dentry *dentry) 1334 { 1335 int retval; 1336 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1337 struct p9_fid *oldfid; 1338 1339 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1340 dir->i_ino, dentry, old_dentry); 1341 1342 oldfid = v9fs_fid_clone(old_dentry); 1343 if (IS_ERR(oldfid)) 1344 return PTR_ERR(oldfid); 1345 1346 sprintf(name, "%d\n", oldfid->fid); 1347 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1348 if (!retval) { 1349 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1350 v9fs_invalidate_inode_attr(dir); 1351 } 1352 p9_fid_put(oldfid); 1353 return retval; 1354 } 1355 1356 /** 1357 * v9fs_vfs_mknod - create a special file 1358 * @idmap: idmap of the mount 1359 * @dir: inode destination for new link 1360 * @dentry: dentry for file 1361 * @mode: mode for creation 1362 * @rdev: device associated with special file 1363 * 1364 */ 1365 1366 static int 1367 v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir, 1368 struct dentry *dentry, umode_t mode, dev_t rdev) 1369 { 1370 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1371 int retval; 1372 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1373 u32 perm; 1374 1375 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1376 dir->i_ino, dentry, mode, 1377 MAJOR(rdev), MINOR(rdev)); 1378 1379 /* build extension */ 1380 if (S_ISBLK(mode)) 1381 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1382 else if (S_ISCHR(mode)) 1383 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1384 else 1385 *name = 0; 1386 1387 perm = unixmode2p9mode(v9ses, mode); 1388 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1389 1390 return retval; 1391 } 1392 1393 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1394 { 1395 int umode; 1396 dev_t rdev; 1397 struct p9_wstat *st; 1398 struct v9fs_session_info *v9ses; 1399 unsigned int flags; 1400 1401 v9ses = v9fs_inode2v9ses(inode); 1402 st = p9_client_stat(fid); 1403 if (IS_ERR(st)) 1404 return PTR_ERR(st); 1405 /* 1406 * Don't update inode if the file type is different 1407 */ 1408 umode = p9mode2unixmode(v9ses, st, &rdev); 1409 if (inode_wrong_type(inode, umode)) 1410 goto out; 1411 1412 /* 1413 * We don't want to refresh inode->i_size, 1414 * because we may have cached data 1415 */ 1416 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1417 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1418 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1419 out: 1420 p9stat_free(st); 1421 kfree(st); 1422 return 0; 1423 } 1424 1425 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1426 .create = v9fs_vfs_create, 1427 .lookup = v9fs_vfs_lookup, 1428 .atomic_open = v9fs_vfs_atomic_open, 1429 .symlink = v9fs_vfs_symlink, 1430 .link = v9fs_vfs_link, 1431 .unlink = v9fs_vfs_unlink, 1432 .mkdir = v9fs_vfs_mkdir, 1433 .rmdir = v9fs_vfs_rmdir, 1434 .mknod = v9fs_vfs_mknod, 1435 .rename = v9fs_vfs_rename, 1436 .getattr = v9fs_vfs_getattr, 1437 .setattr = v9fs_vfs_setattr, 1438 }; 1439 1440 static const struct inode_operations v9fs_dir_inode_operations = { 1441 .create = v9fs_vfs_create, 1442 .lookup = v9fs_vfs_lookup, 1443 .atomic_open = v9fs_vfs_atomic_open, 1444 .unlink = v9fs_vfs_unlink, 1445 .mkdir = v9fs_vfs_mkdir, 1446 .rmdir = v9fs_vfs_rmdir, 1447 .mknod = v9fs_vfs_mknod, 1448 .rename = v9fs_vfs_rename, 1449 .getattr = v9fs_vfs_getattr, 1450 .setattr = v9fs_vfs_setattr, 1451 }; 1452 1453 static const struct inode_operations v9fs_file_inode_operations = { 1454 .getattr = v9fs_vfs_getattr, 1455 .setattr = v9fs_vfs_setattr, 1456 }; 1457 1458 static const struct inode_operations v9fs_symlink_inode_operations = { 1459 .get_link = v9fs_vfs_get_link, 1460 .getattr = v9fs_vfs_getattr, 1461 .setattr = v9fs_vfs_setattr, 1462 }; 1463 1464