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 #endif 237 v9inode->writeback_fid = NULL; 238 v9inode->cache_validity = 0; 239 mutex_init(&v9inode->v_mutex); 240 return &v9inode->vfs_inode; 241 } 242 243 /** 244 * v9fs_free_inode - destroy an inode 245 * @inode: The inode to be freed 246 */ 247 248 void v9fs_free_inode(struct inode *inode) 249 { 250 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 251 } 252 253 int v9fs_init_inode(struct v9fs_session_info *v9ses, 254 struct inode *inode, umode_t mode, dev_t rdev) 255 { 256 int err = 0; 257 258 inode_init_owner(&init_user_ns, inode, NULL, mode); 259 inode->i_blocks = 0; 260 inode->i_rdev = rdev; 261 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 262 inode->i_mapping->a_ops = &v9fs_addr_operations; 263 inode->i_private = NULL; 264 265 switch (mode & S_IFMT) { 266 case S_IFIFO: 267 case S_IFBLK: 268 case S_IFCHR: 269 case S_IFSOCK: 270 if (v9fs_proto_dotl(v9ses)) { 271 inode->i_op = &v9fs_file_inode_operations_dotl; 272 } else if (v9fs_proto_dotu(v9ses)) { 273 inode->i_op = &v9fs_file_inode_operations; 274 } else { 275 p9_debug(P9_DEBUG_ERROR, 276 "special files without extended mode\n"); 277 err = -EINVAL; 278 goto error; 279 } 280 init_special_inode(inode, inode->i_mode, inode->i_rdev); 281 break; 282 case S_IFREG: 283 if (v9fs_proto_dotl(v9ses)) { 284 inode->i_op = &v9fs_file_inode_operations_dotl; 285 if (v9ses->cache == CACHE_LOOSE || 286 v9ses->cache == CACHE_FSCACHE) 287 inode->i_fop = 288 &v9fs_cached_file_operations_dotl; 289 else if (v9ses->cache == CACHE_MMAP) 290 inode->i_fop = &v9fs_mmap_file_operations_dotl; 291 else 292 inode->i_fop = &v9fs_file_operations_dotl; 293 } else { 294 inode->i_op = &v9fs_file_inode_operations; 295 if (v9ses->cache == CACHE_LOOSE || 296 v9ses->cache == CACHE_FSCACHE) 297 inode->i_fop = 298 &v9fs_cached_file_operations; 299 else if (v9ses->cache == CACHE_MMAP) 300 inode->i_fop = &v9fs_mmap_file_operations; 301 else 302 inode->i_fop = &v9fs_file_operations; 303 } 304 305 break; 306 case S_IFLNK: 307 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 308 p9_debug(P9_DEBUG_ERROR, 309 "extended modes used with legacy protocol\n"); 310 err = -EINVAL; 311 goto error; 312 } 313 314 if (v9fs_proto_dotl(v9ses)) 315 inode->i_op = &v9fs_symlink_inode_operations_dotl; 316 else 317 inode->i_op = &v9fs_symlink_inode_operations; 318 319 break; 320 case S_IFDIR: 321 inc_nlink(inode); 322 if (v9fs_proto_dotl(v9ses)) 323 inode->i_op = &v9fs_dir_inode_operations_dotl; 324 else if (v9fs_proto_dotu(v9ses)) 325 inode->i_op = &v9fs_dir_inode_operations_dotu; 326 else 327 inode->i_op = &v9fs_dir_inode_operations; 328 329 if (v9fs_proto_dotl(v9ses)) 330 inode->i_fop = &v9fs_dir_operations_dotl; 331 else 332 inode->i_fop = &v9fs_dir_operations; 333 334 break; 335 default: 336 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 337 mode, mode & S_IFMT); 338 err = -EINVAL; 339 goto error; 340 } 341 error: 342 return err; 343 344 } 345 346 /** 347 * v9fs_get_inode - helper function to setup an inode 348 * @sb: superblock 349 * @mode: mode to setup inode with 350 * @rdev: The device numbers to set 351 */ 352 353 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 354 { 355 int err; 356 struct inode *inode; 357 struct v9fs_session_info *v9ses = sb->s_fs_info; 358 359 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 360 361 inode = new_inode(sb); 362 if (!inode) { 363 pr_warn("%s (%d): Problem allocating inode\n", 364 __func__, task_pid_nr(current)); 365 return ERR_PTR(-ENOMEM); 366 } 367 err = v9fs_init_inode(v9ses, inode, mode, rdev); 368 if (err) { 369 iput(inode); 370 return ERR_PTR(err); 371 } 372 return inode; 373 } 374 375 /** 376 * v9fs_evict_inode - Remove an inode from the inode cache 377 * @inode: inode to release 378 * 379 */ 380 void v9fs_evict_inode(struct inode *inode) 381 { 382 struct v9fs_inode *v9inode = V9FS_I(inode); 383 __le32 version; 384 385 truncate_inode_pages_final(&inode->i_data); 386 version = cpu_to_le32(v9inode->qid.version); 387 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode, 388 &version); 389 clear_inode(inode); 390 filemap_fdatawrite(&inode->i_data); 391 392 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); 393 /* clunk the fid stashed in writeback_fid */ 394 if (v9inode->writeback_fid) { 395 p9_client_clunk(v9inode->writeback_fid); 396 v9inode->writeback_fid = NULL; 397 } 398 } 399 400 static int v9fs_test_inode(struct inode *inode, void *data) 401 { 402 int umode; 403 dev_t rdev; 404 struct v9fs_inode *v9inode = V9FS_I(inode); 405 struct p9_wstat *st = (struct p9_wstat *)data; 406 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 407 408 umode = p9mode2unixmode(v9ses, st, &rdev); 409 /* don't match inode of different type */ 410 if (inode_wrong_type(inode, umode)) 411 return 0; 412 413 /* compare qid details */ 414 if (memcmp(&v9inode->qid.version, 415 &st->qid.version, sizeof(v9inode->qid.version))) 416 return 0; 417 418 if (v9inode->qid.type != st->qid.type) 419 return 0; 420 421 if (v9inode->qid.path != st->qid.path) 422 return 0; 423 return 1; 424 } 425 426 static int v9fs_test_new_inode(struct inode *inode, void *data) 427 { 428 return 0; 429 } 430 431 static int v9fs_set_inode(struct inode *inode, void *data) 432 { 433 struct v9fs_inode *v9inode = V9FS_I(inode); 434 struct p9_wstat *st = (struct p9_wstat *)data; 435 436 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 437 return 0; 438 } 439 440 static struct inode *v9fs_qid_iget(struct super_block *sb, 441 struct p9_qid *qid, 442 struct p9_wstat *st, 443 int new) 444 { 445 dev_t rdev; 446 int retval; 447 umode_t umode; 448 unsigned long i_ino; 449 struct inode *inode; 450 struct v9fs_session_info *v9ses = sb->s_fs_info; 451 int (*test)(struct inode *inode, void *data); 452 453 if (new) 454 test = v9fs_test_new_inode; 455 else 456 test = v9fs_test_inode; 457 458 i_ino = v9fs_qid2ino(qid); 459 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 460 if (!inode) 461 return ERR_PTR(-ENOMEM); 462 if (!(inode->i_state & I_NEW)) 463 return inode; 464 /* 465 * initialize the inode with the stat info 466 * FIXME!! we may need support for stale inodes 467 * later. 468 */ 469 inode->i_ino = i_ino; 470 umode = p9mode2unixmode(v9ses, st, &rdev); 471 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 472 if (retval) 473 goto error; 474 475 v9fs_stat2inode(st, inode, sb, 0); 476 v9fs_cache_inode_get_cookie(inode); 477 unlock_new_inode(inode); 478 return inode; 479 error: 480 iget_failed(inode); 481 return ERR_PTR(retval); 482 483 } 484 485 struct inode * 486 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 487 struct super_block *sb, int new) 488 { 489 struct p9_wstat *st; 490 struct inode *inode = NULL; 491 492 st = p9_client_stat(fid); 493 if (IS_ERR(st)) 494 return ERR_CAST(st); 495 496 inode = v9fs_qid_iget(sb, &st->qid, st, new); 497 p9stat_free(st); 498 kfree(st); 499 return inode; 500 } 501 502 /** 503 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 504 * plan 9 AT flag. 505 * @flags: flags to convert 506 */ 507 static int v9fs_at_to_dotl_flags(int flags) 508 { 509 int rflags = 0; 510 511 if (flags & AT_REMOVEDIR) 512 rflags |= P9_DOTL_AT_REMOVEDIR; 513 514 return rflags; 515 } 516 517 /** 518 * v9fs_dec_count - helper functon to drop i_nlink. 519 * 520 * If a directory had nlink <= 2 (including . and ..), then we should not drop 521 * the link count, which indicates the underlying exported fs doesn't maintain 522 * nlink accurately. e.g. 523 * - overlayfs sets nlink to 1 for merged dir 524 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 525 * than EXT4_LINK_MAX (65000) links. 526 * 527 * @inode: inode whose nlink is being dropped 528 */ 529 static void v9fs_dec_count(struct inode *inode) 530 { 531 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 532 drop_nlink(inode); 533 } 534 535 /** 536 * v9fs_remove - helper function to remove files and directories 537 * @dir: directory inode that is being deleted 538 * @dentry: dentry that is being deleted 539 * @flags: removing a directory 540 * 541 */ 542 543 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 544 { 545 struct inode *inode; 546 int retval = -EOPNOTSUPP; 547 struct p9_fid *v9fid, *dfid; 548 struct v9fs_session_info *v9ses; 549 550 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 551 dir, dentry, flags); 552 553 v9ses = v9fs_inode2v9ses(dir); 554 inode = d_inode(dentry); 555 dfid = v9fs_parent_fid(dentry); 556 if (IS_ERR(dfid)) { 557 retval = PTR_ERR(dfid); 558 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 559 return retval; 560 } 561 if (v9fs_proto_dotl(v9ses)) 562 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 563 v9fs_at_to_dotl_flags(flags)); 564 p9_client_clunk(dfid); 565 if (retval == -EOPNOTSUPP) { 566 /* Try the one based on path */ 567 v9fid = v9fs_fid_clone(dentry); 568 if (IS_ERR(v9fid)) 569 return PTR_ERR(v9fid); 570 retval = p9_client_remove(v9fid); 571 } 572 if (!retval) { 573 /* 574 * directories on unlink should have zero 575 * link count 576 */ 577 if (flags & AT_REMOVEDIR) { 578 clear_nlink(inode); 579 v9fs_dec_count(dir); 580 } else 581 v9fs_dec_count(inode); 582 583 v9fs_invalidate_inode_attr(inode); 584 v9fs_invalidate_inode_attr(dir); 585 586 /* invalidate all fids associated with dentry */ 587 /* NOTE: This will not include open fids */ 588 dentry->d_op->d_release(dentry); 589 } 590 return retval; 591 } 592 593 /** 594 * v9fs_create - Create a file 595 * @v9ses: session information 596 * @dir: directory that dentry is being created in 597 * @dentry: dentry that is being created 598 * @extension: 9p2000.u extension string to support devices, etc. 599 * @perm: create permissions 600 * @mode: open mode 601 * 602 */ 603 static struct p9_fid * 604 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 605 struct dentry *dentry, char *extension, u32 perm, u8 mode) 606 { 607 int err; 608 const unsigned char *name; 609 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 610 struct inode *inode; 611 612 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 613 614 err = 0; 615 name = dentry->d_name.name; 616 dfid = v9fs_parent_fid(dentry); 617 if (IS_ERR(dfid)) { 618 err = PTR_ERR(dfid); 619 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 620 return ERR_PTR(err); 621 } 622 623 /* clone a fid to use for creation */ 624 ofid = clone_fid(dfid); 625 if (IS_ERR(ofid)) { 626 err = PTR_ERR(ofid); 627 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 628 p9_client_clunk(dfid); 629 return ERR_PTR(err); 630 } 631 632 err = p9_client_fcreate(ofid, name, perm, mode, extension); 633 if (err < 0) { 634 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 635 p9_client_clunk(dfid); 636 goto error; 637 } 638 639 if (!(perm & P9_DMLINK)) { 640 /* now walk from the parent so we can get unopened fid */ 641 fid = p9_client_walk(dfid, 1, &name, 1); 642 if (IS_ERR(fid)) { 643 err = PTR_ERR(fid); 644 p9_debug(P9_DEBUG_VFS, 645 "p9_client_walk failed %d\n", err); 646 fid = NULL; 647 p9_client_clunk(dfid); 648 goto error; 649 } 650 /* 651 * instantiate inode and assign the unopened fid to the dentry 652 */ 653 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 654 if (IS_ERR(inode)) { 655 err = PTR_ERR(inode); 656 p9_debug(P9_DEBUG_VFS, 657 "inode creation failed %d\n", err); 658 p9_client_clunk(dfid); 659 goto error; 660 } 661 v9fs_fid_add(dentry, fid); 662 d_instantiate(dentry, inode); 663 } 664 p9_client_clunk(dfid); 665 return ofid; 666 error: 667 if (ofid) 668 p9_client_clunk(ofid); 669 670 if (fid) 671 p9_client_clunk(fid); 672 673 return ERR_PTR(err); 674 } 675 676 /** 677 * v9fs_vfs_create - VFS hook to create a regular file 678 * @mnt_userns: The user namespace of the mount 679 * @dir: The parent directory 680 * @dentry: The name of file to be created 681 * @mode: The UNIX file mode to set 682 * @excl: True if the file must not yet exist 683 * 684 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 685 * for mknod(2). 686 * 687 */ 688 689 static int 690 v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, 691 struct dentry *dentry, umode_t mode, bool excl) 692 { 693 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 694 u32 perm = unixmode2p9mode(v9ses, mode); 695 struct p9_fid *fid; 696 697 /* P9_OEXCL? */ 698 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 699 if (IS_ERR(fid)) 700 return PTR_ERR(fid); 701 702 v9fs_invalidate_inode_attr(dir); 703 p9_client_clunk(fid); 704 705 return 0; 706 } 707 708 /** 709 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 710 * @mnt_userns: The user namespace of the mount 711 * @dir: inode that is being unlinked 712 * @dentry: dentry that is being unlinked 713 * @mode: mode for new directory 714 * 715 */ 716 717 static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 718 struct dentry *dentry, umode_t mode) 719 { 720 int err; 721 u32 perm; 722 struct p9_fid *fid; 723 struct v9fs_session_info *v9ses; 724 725 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 726 err = 0; 727 v9ses = v9fs_inode2v9ses(dir); 728 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 729 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 730 if (IS_ERR(fid)) { 731 err = PTR_ERR(fid); 732 fid = NULL; 733 } else { 734 inc_nlink(dir); 735 v9fs_invalidate_inode_attr(dir); 736 } 737 738 if (fid) 739 p9_client_clunk(fid); 740 741 return err; 742 } 743 744 /** 745 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 746 * @dir: inode that is being walked from 747 * @dentry: dentry that is being walked to? 748 * @flags: lookup flags (unused) 749 * 750 */ 751 752 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 753 unsigned int flags) 754 { 755 struct dentry *res; 756 struct v9fs_session_info *v9ses; 757 struct p9_fid *dfid, *fid; 758 struct inode *inode; 759 const unsigned char *name; 760 761 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 762 dir, dentry, dentry, flags); 763 764 if (dentry->d_name.len > NAME_MAX) 765 return ERR_PTR(-ENAMETOOLONG); 766 767 v9ses = v9fs_inode2v9ses(dir); 768 /* We can walk d_parent because we hold the dir->i_mutex */ 769 dfid = v9fs_parent_fid(dentry); 770 if (IS_ERR(dfid)) 771 return ERR_CAST(dfid); 772 773 /* 774 * Make sure we don't use a wrong inode due to parallel 775 * unlink. For cached mode create calls request for new 776 * inode. But with cache disabled, lookup should do this. 777 */ 778 name = dentry->d_name.name; 779 fid = p9_client_walk(dfid, 1, &name, 1); 780 p9_client_clunk(dfid); 781 if (fid == ERR_PTR(-ENOENT)) 782 inode = NULL; 783 else if (IS_ERR(fid)) 784 inode = ERR_CAST(fid); 785 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 786 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 787 else 788 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 789 /* 790 * If we had a rename on the server and a parallel lookup 791 * for the new name, then make sure we instantiate with 792 * the new name. ie look up for a/b, while on server somebody 793 * moved b under k and client parallely did a lookup for 794 * k/b. 795 */ 796 res = d_splice_alias(inode, dentry); 797 if (!IS_ERR(fid)) { 798 if (!res) 799 v9fs_fid_add(dentry, fid); 800 else if (!IS_ERR(res)) 801 v9fs_fid_add(res, fid); 802 else 803 p9_client_clunk(fid); 804 } 805 return res; 806 } 807 808 static int 809 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 810 struct file *file, unsigned int flags, umode_t mode) 811 { 812 int err; 813 u32 perm; 814 struct v9fs_inode *v9inode; 815 struct v9fs_session_info *v9ses; 816 struct p9_fid *fid, *inode_fid; 817 struct dentry *res = NULL; 818 struct inode *inode; 819 820 if (d_in_lookup(dentry)) { 821 res = v9fs_vfs_lookup(dir, dentry, 0); 822 if (IS_ERR(res)) 823 return PTR_ERR(res); 824 825 if (res) 826 dentry = res; 827 } 828 829 /* Only creates */ 830 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 831 return finish_no_open(file, res); 832 833 err = 0; 834 835 v9ses = v9fs_inode2v9ses(dir); 836 perm = unixmode2p9mode(v9ses, mode); 837 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 838 v9fs_uflags2omode(flags, 839 v9fs_proto_dotu(v9ses))); 840 if (IS_ERR(fid)) { 841 err = PTR_ERR(fid); 842 fid = NULL; 843 goto error; 844 } 845 846 v9fs_invalidate_inode_attr(dir); 847 inode = d_inode(dentry); 848 v9inode = V9FS_I(inode); 849 mutex_lock(&v9inode->v_mutex); 850 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 851 !v9inode->writeback_fid && 852 ((flags & O_ACCMODE) != O_RDONLY)) { 853 /* 854 * clone a fid and add it to writeback_fid 855 * we do it during open time instead of 856 * page dirty time via write_begin/page_mkwrite 857 * because we want write after unlink usecase 858 * to work. 859 */ 860 inode_fid = v9fs_writeback_fid(dentry); 861 if (IS_ERR(inode_fid)) { 862 err = PTR_ERR(inode_fid); 863 mutex_unlock(&v9inode->v_mutex); 864 goto error; 865 } 866 v9inode->writeback_fid = (void *) inode_fid; 867 } 868 mutex_unlock(&v9inode->v_mutex); 869 err = finish_open(file, dentry, generic_file_open); 870 if (err) 871 goto error; 872 873 file->private_data = fid; 874 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 875 fscache_use_cookie(v9fs_inode_cookie(v9inode), 876 file->f_mode & FMODE_WRITE); 877 v9fs_open_fid_add(inode, fid); 878 879 file->f_mode |= FMODE_CREATED; 880 out: 881 dput(res); 882 return err; 883 884 error: 885 if (fid) 886 p9_client_clunk(fid); 887 goto out; 888 } 889 890 /** 891 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 892 * @i: inode that is being unlinked 893 * @d: dentry that is being unlinked 894 * 895 */ 896 897 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 898 { 899 return v9fs_remove(i, d, 0); 900 } 901 902 /** 903 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 904 * @i: inode that is being unlinked 905 * @d: dentry that is being unlinked 906 * 907 */ 908 909 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 910 { 911 return v9fs_remove(i, d, AT_REMOVEDIR); 912 } 913 914 /** 915 * v9fs_vfs_rename - VFS hook to rename an inode 916 * @mnt_userns: The user namespace of the mount 917 * @old_dir: old dir inode 918 * @old_dentry: old dentry 919 * @new_dir: new dir inode 920 * @new_dentry: new dentry 921 * @flags: RENAME_* flags 922 * 923 */ 924 925 int 926 v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 927 struct dentry *old_dentry, struct inode *new_dir, 928 struct dentry *new_dentry, unsigned int flags) 929 { 930 int retval; 931 struct inode *old_inode; 932 struct inode *new_inode; 933 struct v9fs_session_info *v9ses; 934 struct p9_fid *oldfid, *dfid; 935 struct p9_fid *olddirfid; 936 struct p9_fid *newdirfid; 937 struct p9_wstat wstat; 938 939 if (flags) 940 return -EINVAL; 941 942 p9_debug(P9_DEBUG_VFS, "\n"); 943 retval = 0; 944 old_inode = d_inode(old_dentry); 945 new_inode = d_inode(new_dentry); 946 v9ses = v9fs_inode2v9ses(old_inode); 947 oldfid = v9fs_fid_lookup(old_dentry); 948 if (IS_ERR(oldfid)) 949 return PTR_ERR(oldfid); 950 951 dfid = v9fs_parent_fid(old_dentry); 952 olddirfid = clone_fid(dfid); 953 if (dfid && !IS_ERR(dfid)) 954 p9_client_clunk(dfid); 955 956 if (IS_ERR(olddirfid)) { 957 retval = PTR_ERR(olddirfid); 958 goto done; 959 } 960 961 dfid = v9fs_parent_fid(new_dentry); 962 newdirfid = clone_fid(dfid); 963 p9_client_clunk(dfid); 964 965 if (IS_ERR(newdirfid)) { 966 retval = PTR_ERR(newdirfid); 967 goto clunk_olddir; 968 } 969 970 down_write(&v9ses->rename_sem); 971 if (v9fs_proto_dotl(v9ses)) { 972 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 973 newdirfid, new_dentry->d_name.name); 974 if (retval == -EOPNOTSUPP) 975 retval = p9_client_rename(oldfid, newdirfid, 976 new_dentry->d_name.name); 977 if (retval != -EOPNOTSUPP) 978 goto clunk_newdir; 979 } 980 if (old_dentry->d_parent != new_dentry->d_parent) { 981 /* 982 * 9P .u can only handle file rename in the same directory 983 */ 984 985 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 986 retval = -EXDEV; 987 goto clunk_newdir; 988 } 989 v9fs_blank_wstat(&wstat); 990 wstat.muid = v9ses->uname; 991 wstat.name = new_dentry->d_name.name; 992 retval = p9_client_wstat(oldfid, &wstat); 993 994 clunk_newdir: 995 if (!retval) { 996 if (new_inode) { 997 if (S_ISDIR(new_inode->i_mode)) 998 clear_nlink(new_inode); 999 else 1000 v9fs_dec_count(new_inode); 1001 } 1002 if (S_ISDIR(old_inode->i_mode)) { 1003 if (!new_inode) 1004 inc_nlink(new_dir); 1005 v9fs_dec_count(old_dir); 1006 } 1007 v9fs_invalidate_inode_attr(old_inode); 1008 v9fs_invalidate_inode_attr(old_dir); 1009 v9fs_invalidate_inode_attr(new_dir); 1010 1011 /* successful rename */ 1012 d_move(old_dentry, new_dentry); 1013 } 1014 up_write(&v9ses->rename_sem); 1015 p9_client_clunk(newdirfid); 1016 1017 clunk_olddir: 1018 p9_client_clunk(olddirfid); 1019 1020 done: 1021 p9_client_clunk(oldfid); 1022 return retval; 1023 } 1024 1025 /** 1026 * v9fs_vfs_getattr - retrieve file metadata 1027 * @mnt_userns: The user namespace of the mount 1028 * @path: Object to query 1029 * @stat: metadata structure to populate 1030 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1031 * @flags: AT_STATX_xxx setting 1032 * 1033 */ 1034 1035 static int 1036 v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 1037 struct kstat *stat, u32 request_mask, unsigned int flags) 1038 { 1039 struct dentry *dentry = path->dentry; 1040 struct v9fs_session_info *v9ses; 1041 struct p9_fid *fid; 1042 struct p9_wstat *st; 1043 1044 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1045 v9ses = v9fs_dentry2v9ses(dentry); 1046 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1047 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1048 return 0; 1049 } 1050 fid = v9fs_fid_lookup(dentry); 1051 if (IS_ERR(fid)) 1052 return PTR_ERR(fid); 1053 1054 st = p9_client_stat(fid); 1055 p9_client_clunk(fid); 1056 if (IS_ERR(st)) 1057 return PTR_ERR(st); 1058 1059 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1060 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1061 1062 p9stat_free(st); 1063 kfree(st); 1064 return 0; 1065 } 1066 1067 /** 1068 * v9fs_vfs_setattr - set file metadata 1069 * @mnt_userns: The user namespace of the mount 1070 * @dentry: file whose metadata to set 1071 * @iattr: metadata assignment structure 1072 * 1073 */ 1074 1075 static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, 1076 struct dentry *dentry, struct iattr *iattr) 1077 { 1078 int retval, use_dentry = 0; 1079 struct inode *inode = d_inode(dentry); 1080 struct v9fs_inode *v9inode = V9FS_I(inode); 1081 struct v9fs_session_info *v9ses; 1082 struct p9_fid *fid = NULL; 1083 struct p9_wstat wstat; 1084 1085 p9_debug(P9_DEBUG_VFS, "\n"); 1086 retval = setattr_prepare(&init_user_ns, dentry, iattr); 1087 if (retval) 1088 return retval; 1089 1090 retval = -EPERM; 1091 v9ses = v9fs_dentry2v9ses(dentry); 1092 if (iattr->ia_valid & ATTR_FILE) { 1093 fid = iattr->ia_file->private_data; 1094 WARN_ON(!fid); 1095 } 1096 if (!fid) { 1097 fid = v9fs_fid_lookup(dentry); 1098 use_dentry = 1; 1099 } 1100 if (IS_ERR(fid)) 1101 return PTR_ERR(fid); 1102 1103 v9fs_blank_wstat(&wstat); 1104 if (iattr->ia_valid & ATTR_MODE) 1105 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1106 1107 if (iattr->ia_valid & ATTR_MTIME) 1108 wstat.mtime = iattr->ia_mtime.tv_sec; 1109 1110 if (iattr->ia_valid & ATTR_ATIME) 1111 wstat.atime = iattr->ia_atime.tv_sec; 1112 1113 if (iattr->ia_valid & ATTR_SIZE) 1114 wstat.length = iattr->ia_size; 1115 1116 if (v9fs_proto_dotu(v9ses)) { 1117 if (iattr->ia_valid & ATTR_UID) 1118 wstat.n_uid = iattr->ia_uid; 1119 1120 if (iattr->ia_valid & ATTR_GID) 1121 wstat.n_gid = iattr->ia_gid; 1122 } 1123 1124 /* Write all dirty data */ 1125 if (d_is_reg(dentry)) 1126 filemap_write_and_wait(inode->i_mapping); 1127 1128 retval = p9_client_wstat(fid, &wstat); 1129 1130 if (use_dentry) 1131 p9_client_clunk(fid); 1132 1133 if (retval < 0) 1134 return retval; 1135 1136 if ((iattr->ia_valid & ATTR_SIZE) && 1137 iattr->ia_size != i_size_read(inode)) { 1138 truncate_setsize(inode, iattr->ia_size); 1139 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1140 } 1141 1142 v9fs_invalidate_inode_attr(inode); 1143 1144 setattr_copy(&init_user_ns, inode, iattr); 1145 mark_inode_dirty(inode); 1146 return 0; 1147 } 1148 1149 /** 1150 * v9fs_stat2inode - populate an inode structure with mistat info 1151 * @stat: Plan 9 metadata (mistat) structure 1152 * @inode: inode to populate 1153 * @sb: superblock of filesystem 1154 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1155 * 1156 */ 1157 1158 void 1159 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1160 struct super_block *sb, unsigned int flags) 1161 { 1162 umode_t mode; 1163 struct v9fs_session_info *v9ses = sb->s_fs_info; 1164 struct v9fs_inode *v9inode = V9FS_I(inode); 1165 1166 set_nlink(inode, 1); 1167 1168 inode->i_atime.tv_sec = stat->atime; 1169 inode->i_mtime.tv_sec = stat->mtime; 1170 inode->i_ctime.tv_sec = stat->mtime; 1171 1172 inode->i_uid = v9ses->dfltuid; 1173 inode->i_gid = v9ses->dfltgid; 1174 1175 if (v9fs_proto_dotu(v9ses)) { 1176 inode->i_uid = stat->n_uid; 1177 inode->i_gid = stat->n_gid; 1178 } 1179 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1180 if (v9fs_proto_dotu(v9ses)) { 1181 unsigned int i_nlink; 1182 /* 1183 * Hadlink support got added later to the .u extension. 1184 * So there can be a server out there that doesn't 1185 * support this even with .u extension. That would 1186 * just leave us with stat->extension being an empty 1187 * string, though. 1188 */ 1189 /* HARDLINKCOUNT %u */ 1190 if (sscanf(stat->extension, 1191 " HARDLINKCOUNT %u", &i_nlink) == 1) 1192 set_nlink(inode, i_nlink); 1193 } 1194 } 1195 mode = p9mode2perm(v9ses, stat); 1196 mode |= inode->i_mode & ~S_IALLUGO; 1197 inode->i_mode = mode; 1198 1199 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1200 v9fs_i_size_write(inode, stat->length); 1201 /* not real number of blocks, but 512 byte ones ... */ 1202 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1203 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1204 } 1205 1206 /** 1207 * v9fs_qid2ino - convert qid into inode number 1208 * @qid: qid to hash 1209 * 1210 * BUG: potential for inode number collisions? 1211 */ 1212 1213 ino_t v9fs_qid2ino(struct p9_qid *qid) 1214 { 1215 u64 path = qid->path + 2; 1216 ino_t i = 0; 1217 1218 if (sizeof(ino_t) == sizeof(path)) 1219 memcpy(&i, &path, sizeof(ino_t)); 1220 else 1221 i = (ino_t) (path ^ (path >> 32)); 1222 1223 return i; 1224 } 1225 1226 /** 1227 * v9fs_vfs_get_link - follow a symlink path 1228 * @dentry: dentry for symlink 1229 * @inode: inode for symlink 1230 * @done: delayed call for when we are done with the return value 1231 */ 1232 1233 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1234 struct inode *inode, 1235 struct delayed_call *done) 1236 { 1237 struct v9fs_session_info *v9ses; 1238 struct p9_fid *fid; 1239 struct p9_wstat *st; 1240 char *res; 1241 1242 if (!dentry) 1243 return ERR_PTR(-ECHILD); 1244 1245 v9ses = v9fs_dentry2v9ses(dentry); 1246 fid = v9fs_fid_lookup(dentry); 1247 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1248 1249 if (IS_ERR(fid)) 1250 return ERR_CAST(fid); 1251 1252 if (!v9fs_proto_dotu(v9ses)) 1253 return ERR_PTR(-EBADF); 1254 1255 st = p9_client_stat(fid); 1256 p9_client_clunk(fid); 1257 if (IS_ERR(st)) 1258 return ERR_CAST(st); 1259 1260 if (!(st->mode & P9_DMSYMLINK)) { 1261 p9stat_free(st); 1262 kfree(st); 1263 return ERR_PTR(-EINVAL); 1264 } 1265 res = st->extension; 1266 st->extension = NULL; 1267 if (strlen(res) >= PATH_MAX) 1268 res[PATH_MAX - 1] = '\0'; 1269 1270 p9stat_free(st); 1271 kfree(st); 1272 set_delayed_call(done, kfree_link, res); 1273 return res; 1274 } 1275 1276 /** 1277 * v9fs_vfs_mkspecial - create a special file 1278 * @dir: inode to create special file in 1279 * @dentry: dentry to create 1280 * @perm: mode to create special file 1281 * @extension: 9p2000.u format extension string representing special file 1282 * 1283 */ 1284 1285 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1286 u32 perm, const char *extension) 1287 { 1288 struct p9_fid *fid; 1289 struct v9fs_session_info *v9ses; 1290 1291 v9ses = v9fs_inode2v9ses(dir); 1292 if (!v9fs_proto_dotu(v9ses)) { 1293 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1294 return -EPERM; 1295 } 1296 1297 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1298 P9_OREAD); 1299 if (IS_ERR(fid)) 1300 return PTR_ERR(fid); 1301 1302 v9fs_invalidate_inode_attr(dir); 1303 p9_client_clunk(fid); 1304 return 0; 1305 } 1306 1307 /** 1308 * v9fs_vfs_symlink - helper function to create symlinks 1309 * @mnt_userns: The user namespace of the mount 1310 * @dir: directory inode containing symlink 1311 * @dentry: dentry for symlink 1312 * @symname: symlink data 1313 * 1314 * See Also: 9P2000.u RFC for more information 1315 * 1316 */ 1317 1318 static int 1319 v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1320 struct dentry *dentry, const char *symname) 1321 { 1322 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1323 dir->i_ino, dentry, symname); 1324 1325 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1326 } 1327 1328 #define U32_MAX_DIGITS 10 1329 1330 /** 1331 * v9fs_vfs_link - create a hardlink 1332 * @old_dentry: dentry for file to link to 1333 * @dir: inode destination for new link 1334 * @dentry: dentry for link 1335 * 1336 */ 1337 1338 static int 1339 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1340 struct dentry *dentry) 1341 { 1342 int retval; 1343 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1344 struct p9_fid *oldfid; 1345 1346 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1347 dir->i_ino, dentry, old_dentry); 1348 1349 oldfid = v9fs_fid_clone(old_dentry); 1350 if (IS_ERR(oldfid)) 1351 return PTR_ERR(oldfid); 1352 1353 sprintf(name, "%d\n", oldfid->fid); 1354 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1355 if (!retval) { 1356 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1357 v9fs_invalidate_inode_attr(dir); 1358 } 1359 p9_client_clunk(oldfid); 1360 return retval; 1361 } 1362 1363 /** 1364 * v9fs_vfs_mknod - create a special file 1365 * @mnt_userns: The user namespace of the mount 1366 * @dir: inode destination for new link 1367 * @dentry: dentry for file 1368 * @mode: mode for creation 1369 * @rdev: device associated with special file 1370 * 1371 */ 1372 1373 static int 1374 v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1375 struct dentry *dentry, umode_t mode, dev_t rdev) 1376 { 1377 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1378 int retval; 1379 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1380 u32 perm; 1381 1382 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1383 dir->i_ino, dentry, mode, 1384 MAJOR(rdev), MINOR(rdev)); 1385 1386 /* build extension */ 1387 if (S_ISBLK(mode)) 1388 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1389 else if (S_ISCHR(mode)) 1390 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1391 else 1392 *name = 0; 1393 1394 perm = unixmode2p9mode(v9ses, mode); 1395 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1396 1397 return retval; 1398 } 1399 1400 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1401 { 1402 int umode; 1403 dev_t rdev; 1404 struct p9_wstat *st; 1405 struct v9fs_session_info *v9ses; 1406 unsigned int flags; 1407 1408 v9ses = v9fs_inode2v9ses(inode); 1409 st = p9_client_stat(fid); 1410 if (IS_ERR(st)) 1411 return PTR_ERR(st); 1412 /* 1413 * Don't update inode if the file type is different 1414 */ 1415 umode = p9mode2unixmode(v9ses, st, &rdev); 1416 if (inode_wrong_type(inode, umode)) 1417 goto out; 1418 1419 /* 1420 * We don't want to refresh inode->i_size, 1421 * because we may have cached data 1422 */ 1423 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1424 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1425 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1426 out: 1427 p9stat_free(st); 1428 kfree(st); 1429 return 0; 1430 } 1431 1432 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1433 .create = v9fs_vfs_create, 1434 .lookup = v9fs_vfs_lookup, 1435 .atomic_open = v9fs_vfs_atomic_open, 1436 .symlink = v9fs_vfs_symlink, 1437 .link = v9fs_vfs_link, 1438 .unlink = v9fs_vfs_unlink, 1439 .mkdir = v9fs_vfs_mkdir, 1440 .rmdir = v9fs_vfs_rmdir, 1441 .mknod = v9fs_vfs_mknod, 1442 .rename = v9fs_vfs_rename, 1443 .getattr = v9fs_vfs_getattr, 1444 .setattr = v9fs_vfs_setattr, 1445 }; 1446 1447 static const struct inode_operations v9fs_dir_inode_operations = { 1448 .create = v9fs_vfs_create, 1449 .lookup = v9fs_vfs_lookup, 1450 .atomic_open = v9fs_vfs_atomic_open, 1451 .unlink = v9fs_vfs_unlink, 1452 .mkdir = v9fs_vfs_mkdir, 1453 .rmdir = v9fs_vfs_rmdir, 1454 .mknod = v9fs_vfs_mknod, 1455 .rename = v9fs_vfs_rename, 1456 .getattr = v9fs_vfs_getattr, 1457 .setattr = v9fs_vfs_setattr, 1458 }; 1459 1460 static const struct inode_operations v9fs_file_inode_operations = { 1461 .getattr = v9fs_vfs_getattr, 1462 .setattr = v9fs_vfs_setattr, 1463 }; 1464 1465 static const struct inode_operations v9fs_symlink_inode_operations = { 1466 .get_link = v9fs_vfs_get_link, 1467 .getattr = v9fs_vfs_getattr, 1468 .setattr = v9fs_vfs_setattr, 1469 }; 1470 1471