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 = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL); 232 if (!v9inode) 233 return NULL; 234 v9inode->writeback_fid = NULL; 235 v9inode->cache_validity = 0; 236 mutex_init(&v9inode->v_mutex); 237 return &v9inode->netfs.inode; 238 } 239 240 /** 241 * v9fs_free_inode - destroy an inode 242 * @inode: The inode to be freed 243 */ 244 245 void v9fs_free_inode(struct inode *inode) 246 { 247 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 248 } 249 250 /* 251 * Set parameters for the netfs library 252 */ 253 static void v9fs_set_netfs_context(struct inode *inode) 254 { 255 struct v9fs_inode *v9inode = V9FS_I(inode); 256 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops); 257 } 258 259 int v9fs_init_inode(struct v9fs_session_info *v9ses, 260 struct inode *inode, umode_t mode, dev_t rdev) 261 { 262 int err = 0; 263 264 inode_init_owner(&init_user_ns, inode, NULL, mode); 265 inode->i_blocks = 0; 266 inode->i_rdev = rdev; 267 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 268 inode->i_mapping->a_ops = &v9fs_addr_operations; 269 inode->i_private = NULL; 270 271 switch (mode & S_IFMT) { 272 case S_IFIFO: 273 case S_IFBLK: 274 case S_IFCHR: 275 case S_IFSOCK: 276 if (v9fs_proto_dotl(v9ses)) { 277 inode->i_op = &v9fs_file_inode_operations_dotl; 278 } else if (v9fs_proto_dotu(v9ses)) { 279 inode->i_op = &v9fs_file_inode_operations; 280 } else { 281 p9_debug(P9_DEBUG_ERROR, 282 "special files without extended mode\n"); 283 err = -EINVAL; 284 goto error; 285 } 286 init_special_inode(inode, inode->i_mode, inode->i_rdev); 287 break; 288 case S_IFREG: 289 if (v9fs_proto_dotl(v9ses)) { 290 inode->i_op = &v9fs_file_inode_operations_dotl; 291 if (v9ses->cache == CACHE_LOOSE || 292 v9ses->cache == CACHE_FSCACHE) 293 inode->i_fop = 294 &v9fs_cached_file_operations_dotl; 295 else if (v9ses->cache == CACHE_MMAP) 296 inode->i_fop = &v9fs_mmap_file_operations_dotl; 297 else 298 inode->i_fop = &v9fs_file_operations_dotl; 299 } else { 300 inode->i_op = &v9fs_file_inode_operations; 301 if (v9ses->cache == CACHE_LOOSE || 302 v9ses->cache == CACHE_FSCACHE) 303 inode->i_fop = 304 &v9fs_cached_file_operations; 305 else if (v9ses->cache == CACHE_MMAP) 306 inode->i_fop = &v9fs_mmap_file_operations; 307 else 308 inode->i_fop = &v9fs_file_operations; 309 } 310 311 break; 312 case S_IFLNK: 313 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 314 p9_debug(P9_DEBUG_ERROR, 315 "extended modes used with legacy protocol\n"); 316 err = -EINVAL; 317 goto error; 318 } 319 320 if (v9fs_proto_dotl(v9ses)) 321 inode->i_op = &v9fs_symlink_inode_operations_dotl; 322 else 323 inode->i_op = &v9fs_symlink_inode_operations; 324 325 break; 326 case S_IFDIR: 327 inc_nlink(inode); 328 if (v9fs_proto_dotl(v9ses)) 329 inode->i_op = &v9fs_dir_inode_operations_dotl; 330 else if (v9fs_proto_dotu(v9ses)) 331 inode->i_op = &v9fs_dir_inode_operations_dotu; 332 else 333 inode->i_op = &v9fs_dir_inode_operations; 334 335 if (v9fs_proto_dotl(v9ses)) 336 inode->i_fop = &v9fs_dir_operations_dotl; 337 else 338 inode->i_fop = &v9fs_dir_operations; 339 340 break; 341 default: 342 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 343 mode, mode & S_IFMT); 344 err = -EINVAL; 345 goto error; 346 } 347 348 v9fs_set_netfs_context(inode); 349 error: 350 return err; 351 352 } 353 354 /** 355 * v9fs_get_inode - helper function to setup an inode 356 * @sb: superblock 357 * @mode: mode to setup inode with 358 * @rdev: The device numbers to set 359 */ 360 361 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 362 { 363 int err; 364 struct inode *inode; 365 struct v9fs_session_info *v9ses = sb->s_fs_info; 366 367 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 368 369 inode = new_inode(sb); 370 if (!inode) { 371 pr_warn("%s (%d): Problem allocating inode\n", 372 __func__, task_pid_nr(current)); 373 return ERR_PTR(-ENOMEM); 374 } 375 err = v9fs_init_inode(v9ses, inode, mode, rdev); 376 if (err) { 377 iput(inode); 378 return ERR_PTR(err); 379 } 380 return inode; 381 } 382 383 /** 384 * v9fs_evict_inode - Remove an inode from the inode cache 385 * @inode: inode to release 386 * 387 */ 388 void v9fs_evict_inode(struct inode *inode) 389 { 390 struct v9fs_inode *v9inode = V9FS_I(inode); 391 __le32 version; 392 393 truncate_inode_pages_final(&inode->i_data); 394 version = cpu_to_le32(v9inode->qid.version); 395 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode, 396 &version); 397 clear_inode(inode); 398 filemap_fdatawrite(&inode->i_data); 399 400 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); 401 /* clunk the fid stashed in writeback_fid */ 402 p9_fid_put(v9inode->writeback_fid); 403 v9inode->writeback_fid = NULL; 404 } 405 406 static int v9fs_test_inode(struct inode *inode, void *data) 407 { 408 int umode; 409 dev_t rdev; 410 struct v9fs_inode *v9inode = V9FS_I(inode); 411 struct p9_wstat *st = (struct p9_wstat *)data; 412 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 413 414 umode = p9mode2unixmode(v9ses, st, &rdev); 415 /* don't match inode of different type */ 416 if (inode_wrong_type(inode, umode)) 417 return 0; 418 419 /* compare qid details */ 420 if (memcmp(&v9inode->qid.version, 421 &st->qid.version, sizeof(v9inode->qid.version))) 422 return 0; 423 424 if (v9inode->qid.type != st->qid.type) 425 return 0; 426 427 if (v9inode->qid.path != st->qid.path) 428 return 0; 429 return 1; 430 } 431 432 static int v9fs_test_new_inode(struct inode *inode, void *data) 433 { 434 return 0; 435 } 436 437 static int v9fs_set_inode(struct inode *inode, void *data) 438 { 439 struct v9fs_inode *v9inode = V9FS_I(inode); 440 struct p9_wstat *st = (struct p9_wstat *)data; 441 442 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 443 return 0; 444 } 445 446 static struct inode *v9fs_qid_iget(struct super_block *sb, 447 struct p9_qid *qid, 448 struct p9_wstat *st, 449 int new) 450 { 451 dev_t rdev; 452 int retval; 453 umode_t umode; 454 unsigned long i_ino; 455 struct inode *inode; 456 struct v9fs_session_info *v9ses = sb->s_fs_info; 457 int (*test)(struct inode *inode, void *data); 458 459 if (new) 460 test = v9fs_test_new_inode; 461 else 462 test = v9fs_test_inode; 463 464 i_ino = v9fs_qid2ino(qid); 465 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 466 if (!inode) 467 return ERR_PTR(-ENOMEM); 468 if (!(inode->i_state & I_NEW)) 469 return inode; 470 /* 471 * initialize the inode with the stat info 472 * FIXME!! we may need support for stale inodes 473 * later. 474 */ 475 inode->i_ino = i_ino; 476 umode = p9mode2unixmode(v9ses, st, &rdev); 477 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 478 if (retval) 479 goto error; 480 481 v9fs_stat2inode(st, inode, sb, 0); 482 v9fs_cache_inode_get_cookie(inode); 483 unlock_new_inode(inode); 484 return inode; 485 error: 486 iget_failed(inode); 487 return ERR_PTR(retval); 488 489 } 490 491 struct inode * 492 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 493 struct super_block *sb, int new) 494 { 495 struct p9_wstat *st; 496 struct inode *inode = NULL; 497 498 st = p9_client_stat(fid); 499 if (IS_ERR(st)) 500 return ERR_CAST(st); 501 502 inode = v9fs_qid_iget(sb, &st->qid, st, new); 503 p9stat_free(st); 504 kfree(st); 505 return inode; 506 } 507 508 /** 509 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 510 * plan 9 AT flag. 511 * @flags: flags to convert 512 */ 513 static int v9fs_at_to_dotl_flags(int flags) 514 { 515 int rflags = 0; 516 517 if (flags & AT_REMOVEDIR) 518 rflags |= P9_DOTL_AT_REMOVEDIR; 519 520 return rflags; 521 } 522 523 /** 524 * v9fs_dec_count - helper functon to drop i_nlink. 525 * 526 * If a directory had nlink <= 2 (including . and ..), then we should not drop 527 * the link count, which indicates the underlying exported fs doesn't maintain 528 * nlink accurately. e.g. 529 * - overlayfs sets nlink to 1 for merged dir 530 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 531 * than EXT4_LINK_MAX (65000) links. 532 * 533 * @inode: inode whose nlink is being dropped 534 */ 535 static void v9fs_dec_count(struct inode *inode) 536 { 537 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 538 drop_nlink(inode); 539 } 540 541 /** 542 * v9fs_remove - helper function to remove files and directories 543 * @dir: directory inode that is being deleted 544 * @dentry: dentry that is being deleted 545 * @flags: removing a directory 546 * 547 */ 548 549 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 550 { 551 struct inode *inode; 552 int retval = -EOPNOTSUPP; 553 struct p9_fid *v9fid, *dfid; 554 struct v9fs_session_info *v9ses; 555 556 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 557 dir, dentry, flags); 558 559 v9ses = v9fs_inode2v9ses(dir); 560 inode = d_inode(dentry); 561 dfid = v9fs_parent_fid(dentry); 562 if (IS_ERR(dfid)) { 563 retval = PTR_ERR(dfid); 564 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 565 return retval; 566 } 567 if (v9fs_proto_dotl(v9ses)) 568 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 569 v9fs_at_to_dotl_flags(flags)); 570 p9_fid_put(dfid); 571 if (retval == -EOPNOTSUPP) { 572 /* Try the one based on path */ 573 v9fid = v9fs_fid_clone(dentry); 574 if (IS_ERR(v9fid)) 575 return PTR_ERR(v9fid); 576 retval = p9_client_remove(v9fid); 577 } 578 if (!retval) { 579 /* 580 * directories on unlink should have zero 581 * link count 582 */ 583 if (flags & AT_REMOVEDIR) { 584 clear_nlink(inode); 585 v9fs_dec_count(dir); 586 } else 587 v9fs_dec_count(inode); 588 589 v9fs_invalidate_inode_attr(inode); 590 v9fs_invalidate_inode_attr(dir); 591 592 /* invalidate all fids associated with dentry */ 593 /* NOTE: This will not include open fids */ 594 dentry->d_op->d_release(dentry); 595 } 596 return retval; 597 } 598 599 /** 600 * v9fs_create - Create a file 601 * @v9ses: session information 602 * @dir: directory that dentry is being created in 603 * @dentry: dentry that is being created 604 * @extension: 9p2000.u extension string to support devices, etc. 605 * @perm: create permissions 606 * @mode: open mode 607 * 608 */ 609 static struct p9_fid * 610 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 611 struct dentry *dentry, char *extension, u32 perm, u8 mode) 612 { 613 int err; 614 const unsigned char *name; 615 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 616 struct inode *inode; 617 618 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 619 620 err = 0; 621 name = dentry->d_name.name; 622 dfid = v9fs_parent_fid(dentry); 623 if (IS_ERR(dfid)) { 624 err = PTR_ERR(dfid); 625 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 626 return ERR_PTR(err); 627 } 628 629 /* clone a fid to use for creation */ 630 ofid = clone_fid(dfid); 631 if (IS_ERR(ofid)) { 632 err = PTR_ERR(ofid); 633 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 634 goto error; 635 } 636 637 err = p9_client_fcreate(ofid, name, perm, mode, extension); 638 if (err < 0) { 639 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 640 goto error; 641 } 642 643 if (!(perm & P9_DMLINK)) { 644 /* now walk from the parent so we can get unopened fid */ 645 fid = p9_client_walk(dfid, 1, &name, 1); 646 if (IS_ERR(fid)) { 647 err = PTR_ERR(fid); 648 p9_debug(P9_DEBUG_VFS, 649 "p9_client_walk failed %d\n", err); 650 goto error; 651 } 652 /* 653 * instantiate inode and assign the unopened fid to the dentry 654 */ 655 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 656 if (IS_ERR(inode)) { 657 err = PTR_ERR(inode); 658 p9_debug(P9_DEBUG_VFS, 659 "inode creation failed %d\n", err); 660 goto error; 661 } 662 v9fs_fid_add(dentry, &fid); 663 d_instantiate(dentry, inode); 664 } 665 p9_fid_put(dfid); 666 return ofid; 667 error: 668 p9_fid_put(dfid); 669 p9_fid_put(ofid); 670 p9_fid_put(fid); 671 return ERR_PTR(err); 672 } 673 674 /** 675 * v9fs_vfs_create - VFS hook to create a regular file 676 * @mnt_userns: The user namespace of the mount 677 * @dir: The parent directory 678 * @dentry: The name of file to be created 679 * @mode: The UNIX file mode to set 680 * @excl: True if the file must not yet exist 681 * 682 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 683 * for mknod(2). 684 * 685 */ 686 687 static int 688 v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, 689 struct dentry *dentry, umode_t mode, bool excl) 690 { 691 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 692 u32 perm = unixmode2p9mode(v9ses, mode); 693 struct p9_fid *fid; 694 695 /* P9_OEXCL? */ 696 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 697 if (IS_ERR(fid)) 698 return PTR_ERR(fid); 699 700 v9fs_invalidate_inode_attr(dir); 701 p9_fid_put(fid); 702 703 return 0; 704 } 705 706 /** 707 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 708 * @mnt_userns: The user namespace of the mount 709 * @dir: inode that is being unlinked 710 * @dentry: dentry that is being unlinked 711 * @mode: mode for new directory 712 * 713 */ 714 715 static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 716 struct dentry *dentry, umode_t mode) 717 { 718 int err; 719 u32 perm; 720 struct p9_fid *fid; 721 struct v9fs_session_info *v9ses; 722 723 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 724 err = 0; 725 v9ses = v9fs_inode2v9ses(dir); 726 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 727 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 728 if (IS_ERR(fid)) { 729 err = PTR_ERR(fid); 730 fid = NULL; 731 } else { 732 inc_nlink(dir); 733 v9fs_invalidate_inode_attr(dir); 734 } 735 736 if (fid) 737 p9_fid_put(fid); 738 739 return err; 740 } 741 742 /** 743 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 744 * @dir: inode that is being walked from 745 * @dentry: dentry that is being walked to? 746 * @flags: lookup flags (unused) 747 * 748 */ 749 750 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 751 unsigned int flags) 752 { 753 struct dentry *res; 754 struct v9fs_session_info *v9ses; 755 struct p9_fid *dfid, *fid; 756 struct inode *inode; 757 const unsigned char *name; 758 759 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 760 dir, dentry, dentry, flags); 761 762 if (dentry->d_name.len > NAME_MAX) 763 return ERR_PTR(-ENAMETOOLONG); 764 765 v9ses = v9fs_inode2v9ses(dir); 766 /* We can walk d_parent because we hold the dir->i_mutex */ 767 dfid = v9fs_parent_fid(dentry); 768 if (IS_ERR(dfid)) 769 return ERR_CAST(dfid); 770 771 /* 772 * Make sure we don't use a wrong inode due to parallel 773 * unlink. For cached mode create calls request for new 774 * inode. But with cache disabled, lookup should do this. 775 */ 776 name = dentry->d_name.name; 777 fid = p9_client_walk(dfid, 1, &name, 1); 778 p9_fid_put(dfid); 779 if (fid == ERR_PTR(-ENOENT)) 780 inode = NULL; 781 else if (IS_ERR(fid)) 782 inode = ERR_CAST(fid); 783 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 784 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 785 else 786 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 787 /* 788 * If we had a rename on the server and a parallel lookup 789 * for the new name, then make sure we instantiate with 790 * the new name. ie look up for a/b, while on server somebody 791 * moved b under k and client parallely did a lookup for 792 * k/b. 793 */ 794 res = d_splice_alias(inode, dentry); 795 if (!IS_ERR(fid)) { 796 if (!res) 797 v9fs_fid_add(dentry, &fid); 798 else if (!IS_ERR(res)) 799 v9fs_fid_add(res, &fid); 800 else 801 p9_fid_put(fid); 802 } 803 return res; 804 } 805 806 static int 807 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 808 struct file *file, unsigned int flags, umode_t mode) 809 { 810 int err; 811 u32 perm; 812 struct v9fs_inode *v9inode; 813 struct v9fs_session_info *v9ses; 814 struct p9_fid *fid, *inode_fid; 815 struct dentry *res = NULL; 816 struct inode *inode; 817 818 if (d_in_lookup(dentry)) { 819 res = v9fs_vfs_lookup(dir, dentry, 0); 820 if (IS_ERR(res)) 821 return PTR_ERR(res); 822 823 if (res) 824 dentry = res; 825 } 826 827 /* Only creates */ 828 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 829 return finish_no_open(file, res); 830 831 err = 0; 832 833 v9ses = v9fs_inode2v9ses(dir); 834 perm = unixmode2p9mode(v9ses, mode); 835 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 836 v9fs_uflags2omode(flags, 837 v9fs_proto_dotu(v9ses))); 838 if (IS_ERR(fid)) { 839 err = PTR_ERR(fid); 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 fscache_use_cookie(v9fs_inode_cookie(v9inode), 873 file->f_mode & FMODE_WRITE); 874 v9fs_open_fid_add(inode, &fid); 875 876 file->f_mode |= FMODE_CREATED; 877 out: 878 dput(res); 879 return err; 880 881 error: 882 p9_fid_put(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 = NULL, *dfid = NULL; 931 struct p9_fid *olddirfid = NULL; 932 struct p9_fid *newdirfid = NULL; 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 p9_fid_put(dfid); 950 dfid = NULL; 951 952 if (IS_ERR(olddirfid)) { 953 retval = PTR_ERR(olddirfid); 954 goto error; 955 } 956 957 dfid = v9fs_parent_fid(new_dentry); 958 newdirfid = clone_fid(dfid); 959 p9_fid_put(dfid); 960 dfid = NULL; 961 962 if (IS_ERR(newdirfid)) { 963 retval = PTR_ERR(newdirfid); 964 goto error; 965 } 966 967 down_write(&v9ses->rename_sem); 968 if (v9fs_proto_dotl(v9ses)) { 969 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 970 newdirfid, new_dentry->d_name.name); 971 if (retval == -EOPNOTSUPP) 972 retval = p9_client_rename(oldfid, newdirfid, 973 new_dentry->d_name.name); 974 if (retval != -EOPNOTSUPP) 975 goto error_locked; 976 } 977 if (old_dentry->d_parent != new_dentry->d_parent) { 978 /* 979 * 9P .u can only handle file rename in the same directory 980 */ 981 982 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 983 retval = -EXDEV; 984 goto error_locked; 985 } 986 v9fs_blank_wstat(&wstat); 987 wstat.muid = v9ses->uname; 988 wstat.name = new_dentry->d_name.name; 989 retval = p9_client_wstat(oldfid, &wstat); 990 991 error_locked: 992 if (!retval) { 993 if (new_inode) { 994 if (S_ISDIR(new_inode->i_mode)) 995 clear_nlink(new_inode); 996 else 997 v9fs_dec_count(new_inode); 998 } 999 if (S_ISDIR(old_inode->i_mode)) { 1000 if (!new_inode) 1001 inc_nlink(new_dir); 1002 v9fs_dec_count(old_dir); 1003 } 1004 v9fs_invalidate_inode_attr(old_inode); 1005 v9fs_invalidate_inode_attr(old_dir); 1006 v9fs_invalidate_inode_attr(new_dir); 1007 1008 /* successful rename */ 1009 d_move(old_dentry, new_dentry); 1010 } 1011 up_write(&v9ses->rename_sem); 1012 1013 error: 1014 p9_fid_put(newdirfid); 1015 p9_fid_put(olddirfid); 1016 p9_fid_put(oldfid); 1017 return retval; 1018 } 1019 1020 /** 1021 * v9fs_vfs_getattr - retrieve file metadata 1022 * @mnt_userns: The user namespace of the mount 1023 * @path: Object to query 1024 * @stat: metadata structure to populate 1025 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1026 * @flags: AT_STATX_xxx setting 1027 * 1028 */ 1029 1030 static int 1031 v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 1032 struct kstat *stat, u32 request_mask, unsigned int flags) 1033 { 1034 struct dentry *dentry = path->dentry; 1035 struct v9fs_session_info *v9ses; 1036 struct p9_fid *fid; 1037 struct p9_wstat *st; 1038 1039 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1040 v9ses = v9fs_dentry2v9ses(dentry); 1041 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1042 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1043 return 0; 1044 } 1045 fid = v9fs_fid_lookup(dentry); 1046 if (IS_ERR(fid)) 1047 return PTR_ERR(fid); 1048 1049 st = p9_client_stat(fid); 1050 p9_fid_put(fid); 1051 if (IS_ERR(st)) 1052 return PTR_ERR(st); 1053 1054 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1055 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1056 1057 p9stat_free(st); 1058 kfree(st); 1059 return 0; 1060 } 1061 1062 /** 1063 * v9fs_vfs_setattr - set file metadata 1064 * @mnt_userns: The user namespace of the mount 1065 * @dentry: file whose metadata to set 1066 * @iattr: metadata assignment structure 1067 * 1068 */ 1069 1070 static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, 1071 struct dentry *dentry, struct iattr *iattr) 1072 { 1073 int retval, use_dentry = 0; 1074 struct inode *inode = d_inode(dentry); 1075 struct v9fs_inode *v9inode = V9FS_I(inode); 1076 struct v9fs_session_info *v9ses; 1077 struct p9_fid *fid = NULL; 1078 struct p9_wstat wstat; 1079 1080 p9_debug(P9_DEBUG_VFS, "\n"); 1081 retval = setattr_prepare(&init_user_ns, dentry, iattr); 1082 if (retval) 1083 return retval; 1084 1085 retval = -EPERM; 1086 v9ses = v9fs_dentry2v9ses(dentry); 1087 if (iattr->ia_valid & ATTR_FILE) { 1088 fid = iattr->ia_file->private_data; 1089 WARN_ON(!fid); 1090 } 1091 if (!fid) { 1092 fid = v9fs_fid_lookup(dentry); 1093 use_dentry = 1; 1094 } 1095 if (IS_ERR(fid)) 1096 return PTR_ERR(fid); 1097 1098 v9fs_blank_wstat(&wstat); 1099 if (iattr->ia_valid & ATTR_MODE) 1100 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1101 1102 if (iattr->ia_valid & ATTR_MTIME) 1103 wstat.mtime = iattr->ia_mtime.tv_sec; 1104 1105 if (iattr->ia_valid & ATTR_ATIME) 1106 wstat.atime = iattr->ia_atime.tv_sec; 1107 1108 if (iattr->ia_valid & ATTR_SIZE) 1109 wstat.length = iattr->ia_size; 1110 1111 if (v9fs_proto_dotu(v9ses)) { 1112 if (iattr->ia_valid & ATTR_UID) 1113 wstat.n_uid = iattr->ia_uid; 1114 1115 if (iattr->ia_valid & ATTR_GID) 1116 wstat.n_gid = iattr->ia_gid; 1117 } 1118 1119 /* Write all dirty data */ 1120 if (d_is_reg(dentry)) 1121 filemap_write_and_wait(inode->i_mapping); 1122 1123 retval = p9_client_wstat(fid, &wstat); 1124 1125 if (use_dentry) 1126 p9_fid_put(fid); 1127 1128 if (retval < 0) 1129 return retval; 1130 1131 if ((iattr->ia_valid & ATTR_SIZE) && 1132 iattr->ia_size != i_size_read(inode)) { 1133 truncate_setsize(inode, iattr->ia_size); 1134 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1135 } 1136 1137 v9fs_invalidate_inode_attr(inode); 1138 1139 setattr_copy(&init_user_ns, inode, iattr); 1140 mark_inode_dirty(inode); 1141 return 0; 1142 } 1143 1144 /** 1145 * v9fs_stat2inode - populate an inode structure with mistat info 1146 * @stat: Plan 9 metadata (mistat) structure 1147 * @inode: inode to populate 1148 * @sb: superblock of filesystem 1149 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1150 * 1151 */ 1152 1153 void 1154 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1155 struct super_block *sb, unsigned int flags) 1156 { 1157 umode_t mode; 1158 struct v9fs_session_info *v9ses = sb->s_fs_info; 1159 struct v9fs_inode *v9inode = V9FS_I(inode); 1160 1161 set_nlink(inode, 1); 1162 1163 inode->i_atime.tv_sec = stat->atime; 1164 inode->i_mtime.tv_sec = stat->mtime; 1165 inode->i_ctime.tv_sec = stat->mtime; 1166 1167 inode->i_uid = v9ses->dfltuid; 1168 inode->i_gid = v9ses->dfltgid; 1169 1170 if (v9fs_proto_dotu(v9ses)) { 1171 inode->i_uid = stat->n_uid; 1172 inode->i_gid = stat->n_gid; 1173 } 1174 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1175 if (v9fs_proto_dotu(v9ses)) { 1176 unsigned int i_nlink; 1177 /* 1178 * Hadlink support got added later to the .u extension. 1179 * So there can be a server out there that doesn't 1180 * support this even with .u extension. That would 1181 * just leave us with stat->extension being an empty 1182 * string, though. 1183 */ 1184 /* HARDLINKCOUNT %u */ 1185 if (sscanf(stat->extension, 1186 " HARDLINKCOUNT %u", &i_nlink) == 1) 1187 set_nlink(inode, i_nlink); 1188 } 1189 } 1190 mode = p9mode2perm(v9ses, stat); 1191 mode |= inode->i_mode & ~S_IALLUGO; 1192 inode->i_mode = mode; 1193 1194 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1195 v9fs_i_size_write(inode, stat->length); 1196 /* not real number of blocks, but 512 byte ones ... */ 1197 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1198 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1199 } 1200 1201 /** 1202 * v9fs_qid2ino - convert qid into inode number 1203 * @qid: qid to hash 1204 * 1205 * BUG: potential for inode number collisions? 1206 */ 1207 1208 ino_t v9fs_qid2ino(struct p9_qid *qid) 1209 { 1210 u64 path = qid->path + 2; 1211 ino_t i = 0; 1212 1213 if (sizeof(ino_t) == sizeof(path)) 1214 memcpy(&i, &path, sizeof(ino_t)); 1215 else 1216 i = (ino_t) (path ^ (path >> 32)); 1217 1218 return i; 1219 } 1220 1221 /** 1222 * v9fs_vfs_get_link - follow a symlink path 1223 * @dentry: dentry for symlink 1224 * @inode: inode for symlink 1225 * @done: delayed call for when we are done with the return value 1226 */ 1227 1228 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1229 struct inode *inode, 1230 struct delayed_call *done) 1231 { 1232 struct v9fs_session_info *v9ses; 1233 struct p9_fid *fid; 1234 struct p9_wstat *st; 1235 char *res; 1236 1237 if (!dentry) 1238 return ERR_PTR(-ECHILD); 1239 1240 v9ses = v9fs_dentry2v9ses(dentry); 1241 if (!v9fs_proto_dotu(v9ses)) 1242 return ERR_PTR(-EBADF); 1243 1244 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1245 fid = v9fs_fid_lookup(dentry); 1246 1247 if (IS_ERR(fid)) 1248 return ERR_CAST(fid); 1249 1250 st = p9_client_stat(fid); 1251 p9_fid_put(fid); 1252 if (IS_ERR(st)) 1253 return ERR_CAST(st); 1254 1255 if (!(st->mode & P9_DMSYMLINK)) { 1256 p9stat_free(st); 1257 kfree(st); 1258 return ERR_PTR(-EINVAL); 1259 } 1260 res = st->extension; 1261 st->extension = NULL; 1262 if (strlen(res) >= PATH_MAX) 1263 res[PATH_MAX - 1] = '\0'; 1264 1265 p9stat_free(st); 1266 kfree(st); 1267 set_delayed_call(done, kfree_link, res); 1268 return res; 1269 } 1270 1271 /** 1272 * v9fs_vfs_mkspecial - create a special file 1273 * @dir: inode to create special file in 1274 * @dentry: dentry to create 1275 * @perm: mode to create special file 1276 * @extension: 9p2000.u format extension string representing special file 1277 * 1278 */ 1279 1280 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1281 u32 perm, const char *extension) 1282 { 1283 struct p9_fid *fid; 1284 struct v9fs_session_info *v9ses; 1285 1286 v9ses = v9fs_inode2v9ses(dir); 1287 if (!v9fs_proto_dotu(v9ses)) { 1288 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1289 return -EPERM; 1290 } 1291 1292 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1293 P9_OREAD); 1294 if (IS_ERR(fid)) 1295 return PTR_ERR(fid); 1296 1297 v9fs_invalidate_inode_attr(dir); 1298 p9_fid_put(fid); 1299 return 0; 1300 } 1301 1302 /** 1303 * v9fs_vfs_symlink - helper function to create symlinks 1304 * @mnt_userns: The user namespace of the mount 1305 * @dir: directory inode containing symlink 1306 * @dentry: dentry for symlink 1307 * @symname: symlink data 1308 * 1309 * See Also: 9P2000.u RFC for more information 1310 * 1311 */ 1312 1313 static int 1314 v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1315 struct dentry *dentry, const char *symname) 1316 { 1317 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1318 dir->i_ino, dentry, symname); 1319 1320 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1321 } 1322 1323 #define U32_MAX_DIGITS 10 1324 1325 /** 1326 * v9fs_vfs_link - create a hardlink 1327 * @old_dentry: dentry for file to link to 1328 * @dir: inode destination for new link 1329 * @dentry: dentry for link 1330 * 1331 */ 1332 1333 static int 1334 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1335 struct dentry *dentry) 1336 { 1337 int retval; 1338 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1339 struct p9_fid *oldfid; 1340 1341 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1342 dir->i_ino, dentry, old_dentry); 1343 1344 oldfid = v9fs_fid_clone(old_dentry); 1345 if (IS_ERR(oldfid)) 1346 return PTR_ERR(oldfid); 1347 1348 sprintf(name, "%d\n", oldfid->fid); 1349 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1350 if (!retval) { 1351 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1352 v9fs_invalidate_inode_attr(dir); 1353 } 1354 p9_fid_put(oldfid); 1355 return retval; 1356 } 1357 1358 /** 1359 * v9fs_vfs_mknod - create a special file 1360 * @mnt_userns: The user namespace of the mount 1361 * @dir: inode destination for new link 1362 * @dentry: dentry for file 1363 * @mode: mode for creation 1364 * @rdev: device associated with special file 1365 * 1366 */ 1367 1368 static int 1369 v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1370 struct dentry *dentry, umode_t mode, dev_t rdev) 1371 { 1372 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1373 int retval; 1374 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1375 u32 perm; 1376 1377 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1378 dir->i_ino, dentry, mode, 1379 MAJOR(rdev), MINOR(rdev)); 1380 1381 /* build extension */ 1382 if (S_ISBLK(mode)) 1383 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1384 else if (S_ISCHR(mode)) 1385 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1386 else 1387 *name = 0; 1388 1389 perm = unixmode2p9mode(v9ses, mode); 1390 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1391 1392 return retval; 1393 } 1394 1395 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1396 { 1397 int umode; 1398 dev_t rdev; 1399 struct p9_wstat *st; 1400 struct v9fs_session_info *v9ses; 1401 unsigned int flags; 1402 1403 v9ses = v9fs_inode2v9ses(inode); 1404 st = p9_client_stat(fid); 1405 if (IS_ERR(st)) 1406 return PTR_ERR(st); 1407 /* 1408 * Don't update inode if the file type is different 1409 */ 1410 umode = p9mode2unixmode(v9ses, st, &rdev); 1411 if (inode_wrong_type(inode, umode)) 1412 goto out; 1413 1414 /* 1415 * We don't want to refresh inode->i_size, 1416 * because we may have cached data 1417 */ 1418 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1419 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1420 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1421 out: 1422 p9stat_free(st); 1423 kfree(st); 1424 return 0; 1425 } 1426 1427 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1428 .create = v9fs_vfs_create, 1429 .lookup = v9fs_vfs_lookup, 1430 .atomic_open = v9fs_vfs_atomic_open, 1431 .symlink = v9fs_vfs_symlink, 1432 .link = v9fs_vfs_link, 1433 .unlink = v9fs_vfs_unlink, 1434 .mkdir = v9fs_vfs_mkdir, 1435 .rmdir = v9fs_vfs_rmdir, 1436 .mknod = v9fs_vfs_mknod, 1437 .rename = v9fs_vfs_rename, 1438 .getattr = v9fs_vfs_getattr, 1439 .setattr = v9fs_vfs_setattr, 1440 }; 1441 1442 static const struct inode_operations v9fs_dir_inode_operations = { 1443 .create = v9fs_vfs_create, 1444 .lookup = v9fs_vfs_lookup, 1445 .atomic_open = v9fs_vfs_atomic_open, 1446 .unlink = v9fs_vfs_unlink, 1447 .mkdir = v9fs_vfs_mkdir, 1448 .rmdir = v9fs_vfs_rmdir, 1449 .mknod = v9fs_vfs_mknod, 1450 .rename = v9fs_vfs_rename, 1451 .getattr = v9fs_vfs_getattr, 1452 .setattr = v9fs_vfs_setattr, 1453 }; 1454 1455 static const struct inode_operations v9fs_file_inode_operations = { 1456 .getattr = v9fs_vfs_getattr, 1457 .setattr = v9fs_vfs_setattr, 1458 }; 1459 1460 static const struct inode_operations v9fs_symlink_inode_operations = { 1461 .get_link = v9fs_vfs_get_link, 1462 .getattr = v9fs_vfs_getattr, 1463 .setattr = v9fs_vfs_setattr, 1464 }; 1465 1466