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->vfs_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 netfs_i_context_init(inode, &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(&init_user_ns, 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 if (v9inode->writeback_fid) { 402 p9_client_clunk(v9inode->writeback_fid); 403 v9inode->writeback_fid = NULL; 404 } 405 } 406 407 static int v9fs_test_inode(struct inode *inode, void *data) 408 { 409 int umode; 410 dev_t rdev; 411 struct v9fs_inode *v9inode = V9FS_I(inode); 412 struct p9_wstat *st = (struct p9_wstat *)data; 413 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 414 415 umode = p9mode2unixmode(v9ses, st, &rdev); 416 /* don't match inode of different type */ 417 if (inode_wrong_type(inode, umode)) 418 return 0; 419 420 /* compare qid details */ 421 if (memcmp(&v9inode->qid.version, 422 &st->qid.version, sizeof(v9inode->qid.version))) 423 return 0; 424 425 if (v9inode->qid.type != st->qid.type) 426 return 0; 427 428 if (v9inode->qid.path != st->qid.path) 429 return 0; 430 return 1; 431 } 432 433 static int v9fs_test_new_inode(struct inode *inode, void *data) 434 { 435 return 0; 436 } 437 438 static int v9fs_set_inode(struct inode *inode, void *data) 439 { 440 struct v9fs_inode *v9inode = V9FS_I(inode); 441 struct p9_wstat *st = (struct p9_wstat *)data; 442 443 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 444 return 0; 445 } 446 447 static struct inode *v9fs_qid_iget(struct super_block *sb, 448 struct p9_qid *qid, 449 struct p9_wstat *st, 450 int new) 451 { 452 dev_t rdev; 453 int retval; 454 umode_t umode; 455 unsigned long i_ino; 456 struct inode *inode; 457 struct v9fs_session_info *v9ses = sb->s_fs_info; 458 int (*test)(struct inode *inode, void *data); 459 460 if (new) 461 test = v9fs_test_new_inode; 462 else 463 test = v9fs_test_inode; 464 465 i_ino = v9fs_qid2ino(qid); 466 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 467 if (!inode) 468 return ERR_PTR(-ENOMEM); 469 if (!(inode->i_state & I_NEW)) 470 return inode; 471 /* 472 * initialize the inode with the stat info 473 * FIXME!! we may need support for stale inodes 474 * later. 475 */ 476 inode->i_ino = i_ino; 477 umode = p9mode2unixmode(v9ses, st, &rdev); 478 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 479 if (retval) 480 goto error; 481 482 v9fs_stat2inode(st, inode, sb, 0); 483 v9fs_cache_inode_get_cookie(inode); 484 unlock_new_inode(inode); 485 return inode; 486 error: 487 iget_failed(inode); 488 return ERR_PTR(retval); 489 490 } 491 492 struct inode * 493 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 494 struct super_block *sb, int new) 495 { 496 struct p9_wstat *st; 497 struct inode *inode = NULL; 498 499 st = p9_client_stat(fid); 500 if (IS_ERR(st)) 501 return ERR_CAST(st); 502 503 inode = v9fs_qid_iget(sb, &st->qid, st, new); 504 p9stat_free(st); 505 kfree(st); 506 return inode; 507 } 508 509 /** 510 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 511 * plan 9 AT flag. 512 * @flags: flags to convert 513 */ 514 static int v9fs_at_to_dotl_flags(int flags) 515 { 516 int rflags = 0; 517 518 if (flags & AT_REMOVEDIR) 519 rflags |= P9_DOTL_AT_REMOVEDIR; 520 521 return rflags; 522 } 523 524 /** 525 * v9fs_dec_count - helper functon to drop i_nlink. 526 * 527 * If a directory had nlink <= 2 (including . and ..), then we should not drop 528 * the link count, which indicates the underlying exported fs doesn't maintain 529 * nlink accurately. e.g. 530 * - overlayfs sets nlink to 1 for merged dir 531 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 532 * than EXT4_LINK_MAX (65000) links. 533 * 534 * @inode: inode whose nlink is being dropped 535 */ 536 static void v9fs_dec_count(struct inode *inode) 537 { 538 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 539 drop_nlink(inode); 540 } 541 542 /** 543 * v9fs_remove - helper function to remove files and directories 544 * @dir: directory inode that is being deleted 545 * @dentry: dentry that is being deleted 546 * @flags: removing a directory 547 * 548 */ 549 550 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 551 { 552 struct inode *inode; 553 int retval = -EOPNOTSUPP; 554 struct p9_fid *v9fid, *dfid; 555 struct v9fs_session_info *v9ses; 556 557 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 558 dir, dentry, flags); 559 560 v9ses = v9fs_inode2v9ses(dir); 561 inode = d_inode(dentry); 562 dfid = v9fs_parent_fid(dentry); 563 if (IS_ERR(dfid)) { 564 retval = PTR_ERR(dfid); 565 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 566 return retval; 567 } 568 if (v9fs_proto_dotl(v9ses)) 569 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 570 v9fs_at_to_dotl_flags(flags)); 571 p9_client_clunk(dfid); 572 if (retval == -EOPNOTSUPP) { 573 /* Try the one based on path */ 574 v9fid = v9fs_fid_clone(dentry); 575 if (IS_ERR(v9fid)) 576 return PTR_ERR(v9fid); 577 retval = p9_client_remove(v9fid); 578 } 579 if (!retval) { 580 /* 581 * directories on unlink should have zero 582 * link count 583 */ 584 if (flags & AT_REMOVEDIR) { 585 clear_nlink(inode); 586 v9fs_dec_count(dir); 587 } else 588 v9fs_dec_count(inode); 589 590 v9fs_invalidate_inode_attr(inode); 591 v9fs_invalidate_inode_attr(dir); 592 593 /* invalidate all fids associated with dentry */ 594 /* NOTE: This will not include open fids */ 595 dentry->d_op->d_release(dentry); 596 } 597 return retval; 598 } 599 600 /** 601 * v9fs_create - Create a file 602 * @v9ses: session information 603 * @dir: directory that dentry is being created in 604 * @dentry: dentry that is being created 605 * @extension: 9p2000.u extension string to support devices, etc. 606 * @perm: create permissions 607 * @mode: open mode 608 * 609 */ 610 static struct p9_fid * 611 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 612 struct dentry *dentry, char *extension, u32 perm, u8 mode) 613 { 614 int err; 615 const unsigned char *name; 616 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 617 struct inode *inode; 618 619 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 620 621 err = 0; 622 name = dentry->d_name.name; 623 dfid = v9fs_parent_fid(dentry); 624 if (IS_ERR(dfid)) { 625 err = PTR_ERR(dfid); 626 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 627 return ERR_PTR(err); 628 } 629 630 /* clone a fid to use for creation */ 631 ofid = clone_fid(dfid); 632 if (IS_ERR(ofid)) { 633 err = PTR_ERR(ofid); 634 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 635 p9_client_clunk(dfid); 636 return ERR_PTR(err); 637 } 638 639 err = p9_client_fcreate(ofid, name, perm, mode, extension); 640 if (err < 0) { 641 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 642 p9_client_clunk(dfid); 643 goto error; 644 } 645 646 if (!(perm & P9_DMLINK)) { 647 /* now walk from the parent so we can get unopened fid */ 648 fid = p9_client_walk(dfid, 1, &name, 1); 649 if (IS_ERR(fid)) { 650 err = PTR_ERR(fid); 651 p9_debug(P9_DEBUG_VFS, 652 "p9_client_walk failed %d\n", err); 653 fid = NULL; 654 p9_client_clunk(dfid); 655 goto error; 656 } 657 /* 658 * instantiate inode and assign the unopened fid to the dentry 659 */ 660 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 661 if (IS_ERR(inode)) { 662 err = PTR_ERR(inode); 663 p9_debug(P9_DEBUG_VFS, 664 "inode creation failed %d\n", err); 665 p9_client_clunk(dfid); 666 goto error; 667 } 668 v9fs_fid_add(dentry, fid); 669 d_instantiate(dentry, inode); 670 } 671 p9_client_clunk(dfid); 672 return ofid; 673 error: 674 if (ofid) 675 p9_client_clunk(ofid); 676 677 if (fid) 678 p9_client_clunk(fid); 679 680 return ERR_PTR(err); 681 } 682 683 /** 684 * v9fs_vfs_create - VFS hook to create a regular file 685 * @mnt_userns: The user namespace of the mount 686 * @dir: The parent directory 687 * @dentry: The name of file to be created 688 * @mode: The UNIX file mode to set 689 * @excl: True if the file must not yet exist 690 * 691 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 692 * for mknod(2). 693 * 694 */ 695 696 static int 697 v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, 698 struct dentry *dentry, umode_t mode, bool excl) 699 { 700 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 701 u32 perm = unixmode2p9mode(v9ses, mode); 702 struct p9_fid *fid; 703 704 /* P9_OEXCL? */ 705 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 706 if (IS_ERR(fid)) 707 return PTR_ERR(fid); 708 709 v9fs_invalidate_inode_attr(dir); 710 p9_client_clunk(fid); 711 712 return 0; 713 } 714 715 /** 716 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 717 * @mnt_userns: The user namespace of the mount 718 * @dir: inode that is being unlinked 719 * @dentry: dentry that is being unlinked 720 * @mode: mode for new directory 721 * 722 */ 723 724 static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 725 struct dentry *dentry, umode_t mode) 726 { 727 int err; 728 u32 perm; 729 struct p9_fid *fid; 730 struct v9fs_session_info *v9ses; 731 732 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 733 err = 0; 734 v9ses = v9fs_inode2v9ses(dir); 735 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 736 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 737 if (IS_ERR(fid)) { 738 err = PTR_ERR(fid); 739 fid = NULL; 740 } else { 741 inc_nlink(dir); 742 v9fs_invalidate_inode_attr(dir); 743 } 744 745 if (fid) 746 p9_client_clunk(fid); 747 748 return err; 749 } 750 751 /** 752 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 753 * @dir: inode that is being walked from 754 * @dentry: dentry that is being walked to? 755 * @flags: lookup flags (unused) 756 * 757 */ 758 759 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 760 unsigned int flags) 761 { 762 struct dentry *res; 763 struct v9fs_session_info *v9ses; 764 struct p9_fid *dfid, *fid; 765 struct inode *inode; 766 const unsigned char *name; 767 768 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 769 dir, dentry, dentry, flags); 770 771 if (dentry->d_name.len > NAME_MAX) 772 return ERR_PTR(-ENAMETOOLONG); 773 774 v9ses = v9fs_inode2v9ses(dir); 775 /* We can walk d_parent because we hold the dir->i_mutex */ 776 dfid = v9fs_parent_fid(dentry); 777 if (IS_ERR(dfid)) 778 return ERR_CAST(dfid); 779 780 /* 781 * Make sure we don't use a wrong inode due to parallel 782 * unlink. For cached mode create calls request for new 783 * inode. But with cache disabled, lookup should do this. 784 */ 785 name = dentry->d_name.name; 786 fid = p9_client_walk(dfid, 1, &name, 1); 787 p9_client_clunk(dfid); 788 if (fid == ERR_PTR(-ENOENT)) 789 inode = NULL; 790 else if (IS_ERR(fid)) 791 inode = ERR_CAST(fid); 792 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 793 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 794 else 795 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 796 /* 797 * If we had a rename on the server and a parallel lookup 798 * for the new name, then make sure we instantiate with 799 * the new name. ie look up for a/b, while on server somebody 800 * moved b under k and client parallely did a lookup for 801 * k/b. 802 */ 803 res = d_splice_alias(inode, dentry); 804 if (!IS_ERR(fid)) { 805 if (!res) 806 v9fs_fid_add(dentry, fid); 807 else if (!IS_ERR(res)) 808 v9fs_fid_add(res, fid); 809 else 810 p9_client_clunk(fid); 811 } 812 return res; 813 } 814 815 static int 816 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 817 struct file *file, unsigned int flags, umode_t mode) 818 { 819 int err; 820 u32 perm; 821 struct v9fs_inode *v9inode; 822 struct v9fs_session_info *v9ses; 823 struct p9_fid *fid, *inode_fid; 824 struct dentry *res = NULL; 825 struct inode *inode; 826 827 if (d_in_lookup(dentry)) { 828 res = v9fs_vfs_lookup(dir, dentry, 0); 829 if (IS_ERR(res)) 830 return PTR_ERR(res); 831 832 if (res) 833 dentry = res; 834 } 835 836 /* Only creates */ 837 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 838 return finish_no_open(file, res); 839 840 err = 0; 841 842 v9ses = v9fs_inode2v9ses(dir); 843 perm = unixmode2p9mode(v9ses, mode); 844 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 845 v9fs_uflags2omode(flags, 846 v9fs_proto_dotu(v9ses))); 847 if (IS_ERR(fid)) { 848 err = PTR_ERR(fid); 849 fid = NULL; 850 goto error; 851 } 852 853 v9fs_invalidate_inode_attr(dir); 854 inode = d_inode(dentry); 855 v9inode = V9FS_I(inode); 856 mutex_lock(&v9inode->v_mutex); 857 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 858 !v9inode->writeback_fid && 859 ((flags & O_ACCMODE) != O_RDONLY)) { 860 /* 861 * clone a fid and add it to writeback_fid 862 * we do it during open time instead of 863 * page dirty time via write_begin/page_mkwrite 864 * because we want write after unlink usecase 865 * to work. 866 */ 867 inode_fid = v9fs_writeback_fid(dentry); 868 if (IS_ERR(inode_fid)) { 869 err = PTR_ERR(inode_fid); 870 mutex_unlock(&v9inode->v_mutex); 871 goto error; 872 } 873 v9inode->writeback_fid = (void *) inode_fid; 874 } 875 mutex_unlock(&v9inode->v_mutex); 876 err = finish_open(file, dentry, generic_file_open); 877 if (err) 878 goto error; 879 880 file->private_data = fid; 881 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 882 fscache_use_cookie(v9fs_inode_cookie(v9inode), 883 file->f_mode & FMODE_WRITE); 884 v9fs_open_fid_add(inode, fid); 885 886 file->f_mode |= FMODE_CREATED; 887 out: 888 dput(res); 889 return err; 890 891 error: 892 if (fid) 893 p9_client_clunk(fid); 894 goto out; 895 } 896 897 /** 898 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 899 * @i: inode that is being unlinked 900 * @d: dentry that is being unlinked 901 * 902 */ 903 904 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 905 { 906 return v9fs_remove(i, d, 0); 907 } 908 909 /** 910 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 911 * @i: inode that is being unlinked 912 * @d: dentry that is being unlinked 913 * 914 */ 915 916 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 917 { 918 return v9fs_remove(i, d, AT_REMOVEDIR); 919 } 920 921 /** 922 * v9fs_vfs_rename - VFS hook to rename an inode 923 * @mnt_userns: The user namespace of the mount 924 * @old_dir: old dir inode 925 * @old_dentry: old dentry 926 * @new_dir: new dir inode 927 * @new_dentry: new dentry 928 * @flags: RENAME_* flags 929 * 930 */ 931 932 int 933 v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 934 struct dentry *old_dentry, struct inode *new_dir, 935 struct dentry *new_dentry, unsigned int flags) 936 { 937 int retval; 938 struct inode *old_inode; 939 struct inode *new_inode; 940 struct v9fs_session_info *v9ses; 941 struct p9_fid *oldfid, *dfid; 942 struct p9_fid *olddirfid; 943 struct p9_fid *newdirfid; 944 struct p9_wstat wstat; 945 946 if (flags) 947 return -EINVAL; 948 949 p9_debug(P9_DEBUG_VFS, "\n"); 950 retval = 0; 951 old_inode = d_inode(old_dentry); 952 new_inode = d_inode(new_dentry); 953 v9ses = v9fs_inode2v9ses(old_inode); 954 oldfid = v9fs_fid_lookup(old_dentry); 955 if (IS_ERR(oldfid)) 956 return PTR_ERR(oldfid); 957 958 dfid = v9fs_parent_fid(old_dentry); 959 olddirfid = clone_fid(dfid); 960 if (dfid && !IS_ERR(dfid)) 961 p9_client_clunk(dfid); 962 963 if (IS_ERR(olddirfid)) { 964 retval = PTR_ERR(olddirfid); 965 goto done; 966 } 967 968 dfid = v9fs_parent_fid(new_dentry); 969 newdirfid = clone_fid(dfid); 970 p9_client_clunk(dfid); 971 972 if (IS_ERR(newdirfid)) { 973 retval = PTR_ERR(newdirfid); 974 goto clunk_olddir; 975 } 976 977 down_write(&v9ses->rename_sem); 978 if (v9fs_proto_dotl(v9ses)) { 979 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 980 newdirfid, new_dentry->d_name.name); 981 if (retval == -EOPNOTSUPP) 982 retval = p9_client_rename(oldfid, newdirfid, 983 new_dentry->d_name.name); 984 if (retval != -EOPNOTSUPP) 985 goto clunk_newdir; 986 } 987 if (old_dentry->d_parent != new_dentry->d_parent) { 988 /* 989 * 9P .u can only handle file rename in the same directory 990 */ 991 992 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 993 retval = -EXDEV; 994 goto clunk_newdir; 995 } 996 v9fs_blank_wstat(&wstat); 997 wstat.muid = v9ses->uname; 998 wstat.name = new_dentry->d_name.name; 999 retval = p9_client_wstat(oldfid, &wstat); 1000 1001 clunk_newdir: 1002 if (!retval) { 1003 if (new_inode) { 1004 if (S_ISDIR(new_inode->i_mode)) 1005 clear_nlink(new_inode); 1006 else 1007 v9fs_dec_count(new_inode); 1008 } 1009 if (S_ISDIR(old_inode->i_mode)) { 1010 if (!new_inode) 1011 inc_nlink(new_dir); 1012 v9fs_dec_count(old_dir); 1013 } 1014 v9fs_invalidate_inode_attr(old_inode); 1015 v9fs_invalidate_inode_attr(old_dir); 1016 v9fs_invalidate_inode_attr(new_dir); 1017 1018 /* successful rename */ 1019 d_move(old_dentry, new_dentry); 1020 } 1021 up_write(&v9ses->rename_sem); 1022 p9_client_clunk(newdirfid); 1023 1024 clunk_olddir: 1025 p9_client_clunk(olddirfid); 1026 1027 done: 1028 p9_client_clunk(oldfid); 1029 return retval; 1030 } 1031 1032 /** 1033 * v9fs_vfs_getattr - retrieve file metadata 1034 * @mnt_userns: The user namespace of the mount 1035 * @path: Object to query 1036 * @stat: metadata structure to populate 1037 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1038 * @flags: AT_STATX_xxx setting 1039 * 1040 */ 1041 1042 static int 1043 v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 1044 struct kstat *stat, u32 request_mask, unsigned int flags) 1045 { 1046 struct dentry *dentry = path->dentry; 1047 struct v9fs_session_info *v9ses; 1048 struct p9_fid *fid; 1049 struct p9_wstat *st; 1050 1051 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1052 v9ses = v9fs_dentry2v9ses(dentry); 1053 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1054 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1055 return 0; 1056 } 1057 fid = v9fs_fid_lookup(dentry); 1058 if (IS_ERR(fid)) 1059 return PTR_ERR(fid); 1060 1061 st = p9_client_stat(fid); 1062 p9_client_clunk(fid); 1063 if (IS_ERR(st)) 1064 return PTR_ERR(st); 1065 1066 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1067 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1068 1069 p9stat_free(st); 1070 kfree(st); 1071 return 0; 1072 } 1073 1074 /** 1075 * v9fs_vfs_setattr - set file metadata 1076 * @mnt_userns: The user namespace of the mount 1077 * @dentry: file whose metadata to set 1078 * @iattr: metadata assignment structure 1079 * 1080 */ 1081 1082 static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, 1083 struct dentry *dentry, struct iattr *iattr) 1084 { 1085 int retval, use_dentry = 0; 1086 struct inode *inode = d_inode(dentry); 1087 struct v9fs_inode *v9inode = V9FS_I(inode); 1088 struct v9fs_session_info *v9ses; 1089 struct p9_fid *fid = NULL; 1090 struct p9_wstat wstat; 1091 1092 p9_debug(P9_DEBUG_VFS, "\n"); 1093 retval = setattr_prepare(&init_user_ns, dentry, iattr); 1094 if (retval) 1095 return retval; 1096 1097 retval = -EPERM; 1098 v9ses = v9fs_dentry2v9ses(dentry); 1099 if (iattr->ia_valid & ATTR_FILE) { 1100 fid = iattr->ia_file->private_data; 1101 WARN_ON(!fid); 1102 } 1103 if (!fid) { 1104 fid = v9fs_fid_lookup(dentry); 1105 use_dentry = 1; 1106 } 1107 if (IS_ERR(fid)) 1108 return PTR_ERR(fid); 1109 1110 v9fs_blank_wstat(&wstat); 1111 if (iattr->ia_valid & ATTR_MODE) 1112 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1113 1114 if (iattr->ia_valid & ATTR_MTIME) 1115 wstat.mtime = iattr->ia_mtime.tv_sec; 1116 1117 if (iattr->ia_valid & ATTR_ATIME) 1118 wstat.atime = iattr->ia_atime.tv_sec; 1119 1120 if (iattr->ia_valid & ATTR_SIZE) 1121 wstat.length = iattr->ia_size; 1122 1123 if (v9fs_proto_dotu(v9ses)) { 1124 if (iattr->ia_valid & ATTR_UID) 1125 wstat.n_uid = iattr->ia_uid; 1126 1127 if (iattr->ia_valid & ATTR_GID) 1128 wstat.n_gid = iattr->ia_gid; 1129 } 1130 1131 /* Write all dirty data */ 1132 if (d_is_reg(dentry)) 1133 filemap_write_and_wait(inode->i_mapping); 1134 1135 retval = p9_client_wstat(fid, &wstat); 1136 1137 if (use_dentry) 1138 p9_client_clunk(fid); 1139 1140 if (retval < 0) 1141 return retval; 1142 1143 if ((iattr->ia_valid & ATTR_SIZE) && 1144 iattr->ia_size != i_size_read(inode)) { 1145 truncate_setsize(inode, iattr->ia_size); 1146 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1147 } 1148 1149 v9fs_invalidate_inode_attr(inode); 1150 1151 setattr_copy(&init_user_ns, inode, iattr); 1152 mark_inode_dirty(inode); 1153 return 0; 1154 } 1155 1156 /** 1157 * v9fs_stat2inode - populate an inode structure with mistat info 1158 * @stat: Plan 9 metadata (mistat) structure 1159 * @inode: inode to populate 1160 * @sb: superblock of filesystem 1161 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1162 * 1163 */ 1164 1165 void 1166 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1167 struct super_block *sb, unsigned int flags) 1168 { 1169 umode_t mode; 1170 struct v9fs_session_info *v9ses = sb->s_fs_info; 1171 struct v9fs_inode *v9inode = V9FS_I(inode); 1172 1173 set_nlink(inode, 1); 1174 1175 inode->i_atime.tv_sec = stat->atime; 1176 inode->i_mtime.tv_sec = stat->mtime; 1177 inode->i_ctime.tv_sec = stat->mtime; 1178 1179 inode->i_uid = v9ses->dfltuid; 1180 inode->i_gid = v9ses->dfltgid; 1181 1182 if (v9fs_proto_dotu(v9ses)) { 1183 inode->i_uid = stat->n_uid; 1184 inode->i_gid = stat->n_gid; 1185 } 1186 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1187 if (v9fs_proto_dotu(v9ses)) { 1188 unsigned int i_nlink; 1189 /* 1190 * Hadlink support got added later to the .u extension. 1191 * So there can be a server out there that doesn't 1192 * support this even with .u extension. That would 1193 * just leave us with stat->extension being an empty 1194 * string, though. 1195 */ 1196 /* HARDLINKCOUNT %u */ 1197 if (sscanf(stat->extension, 1198 " HARDLINKCOUNT %u", &i_nlink) == 1) 1199 set_nlink(inode, i_nlink); 1200 } 1201 } 1202 mode = p9mode2perm(v9ses, stat); 1203 mode |= inode->i_mode & ~S_IALLUGO; 1204 inode->i_mode = mode; 1205 1206 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1207 v9fs_i_size_write(inode, stat->length); 1208 /* not real number of blocks, but 512 byte ones ... */ 1209 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1210 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1211 } 1212 1213 /** 1214 * v9fs_qid2ino - convert qid into inode number 1215 * @qid: qid to hash 1216 * 1217 * BUG: potential for inode number collisions? 1218 */ 1219 1220 ino_t v9fs_qid2ino(struct p9_qid *qid) 1221 { 1222 u64 path = qid->path + 2; 1223 ino_t i = 0; 1224 1225 if (sizeof(ino_t) == sizeof(path)) 1226 memcpy(&i, &path, sizeof(ino_t)); 1227 else 1228 i = (ino_t) (path ^ (path >> 32)); 1229 1230 return i; 1231 } 1232 1233 /** 1234 * v9fs_vfs_get_link - follow a symlink path 1235 * @dentry: dentry for symlink 1236 * @inode: inode for symlink 1237 * @done: delayed call for when we are done with the return value 1238 */ 1239 1240 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1241 struct inode *inode, 1242 struct delayed_call *done) 1243 { 1244 struct v9fs_session_info *v9ses; 1245 struct p9_fid *fid; 1246 struct p9_wstat *st; 1247 char *res; 1248 1249 if (!dentry) 1250 return ERR_PTR(-ECHILD); 1251 1252 v9ses = v9fs_dentry2v9ses(dentry); 1253 fid = v9fs_fid_lookup(dentry); 1254 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1255 1256 if (IS_ERR(fid)) 1257 return ERR_CAST(fid); 1258 1259 if (!v9fs_proto_dotu(v9ses)) 1260 return ERR_PTR(-EBADF); 1261 1262 st = p9_client_stat(fid); 1263 p9_client_clunk(fid); 1264 if (IS_ERR(st)) 1265 return ERR_CAST(st); 1266 1267 if (!(st->mode & P9_DMSYMLINK)) { 1268 p9stat_free(st); 1269 kfree(st); 1270 return ERR_PTR(-EINVAL); 1271 } 1272 res = st->extension; 1273 st->extension = NULL; 1274 if (strlen(res) >= PATH_MAX) 1275 res[PATH_MAX - 1] = '\0'; 1276 1277 p9stat_free(st); 1278 kfree(st); 1279 set_delayed_call(done, kfree_link, res); 1280 return res; 1281 } 1282 1283 /** 1284 * v9fs_vfs_mkspecial - create a special file 1285 * @dir: inode to create special file in 1286 * @dentry: dentry to create 1287 * @perm: mode to create special file 1288 * @extension: 9p2000.u format extension string representing special file 1289 * 1290 */ 1291 1292 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1293 u32 perm, const char *extension) 1294 { 1295 struct p9_fid *fid; 1296 struct v9fs_session_info *v9ses; 1297 1298 v9ses = v9fs_inode2v9ses(dir); 1299 if (!v9fs_proto_dotu(v9ses)) { 1300 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1301 return -EPERM; 1302 } 1303 1304 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1305 P9_OREAD); 1306 if (IS_ERR(fid)) 1307 return PTR_ERR(fid); 1308 1309 v9fs_invalidate_inode_attr(dir); 1310 p9_client_clunk(fid); 1311 return 0; 1312 } 1313 1314 /** 1315 * v9fs_vfs_symlink - helper function to create symlinks 1316 * @mnt_userns: The user namespace of the mount 1317 * @dir: directory inode containing symlink 1318 * @dentry: dentry for symlink 1319 * @symname: symlink data 1320 * 1321 * See Also: 9P2000.u RFC for more information 1322 * 1323 */ 1324 1325 static int 1326 v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1327 struct dentry *dentry, const char *symname) 1328 { 1329 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1330 dir->i_ino, dentry, symname); 1331 1332 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1333 } 1334 1335 #define U32_MAX_DIGITS 10 1336 1337 /** 1338 * v9fs_vfs_link - create a hardlink 1339 * @old_dentry: dentry for file to link to 1340 * @dir: inode destination for new link 1341 * @dentry: dentry for link 1342 * 1343 */ 1344 1345 static int 1346 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1347 struct dentry *dentry) 1348 { 1349 int retval; 1350 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1351 struct p9_fid *oldfid; 1352 1353 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1354 dir->i_ino, dentry, old_dentry); 1355 1356 oldfid = v9fs_fid_clone(old_dentry); 1357 if (IS_ERR(oldfid)) 1358 return PTR_ERR(oldfid); 1359 1360 sprintf(name, "%d\n", oldfid->fid); 1361 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1362 if (!retval) { 1363 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1364 v9fs_invalidate_inode_attr(dir); 1365 } 1366 p9_client_clunk(oldfid); 1367 return retval; 1368 } 1369 1370 /** 1371 * v9fs_vfs_mknod - create a special file 1372 * @mnt_userns: The user namespace of the mount 1373 * @dir: inode destination for new link 1374 * @dentry: dentry for file 1375 * @mode: mode for creation 1376 * @rdev: device associated with special file 1377 * 1378 */ 1379 1380 static int 1381 v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1382 struct dentry *dentry, umode_t mode, dev_t rdev) 1383 { 1384 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1385 int retval; 1386 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1387 u32 perm; 1388 1389 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1390 dir->i_ino, dentry, mode, 1391 MAJOR(rdev), MINOR(rdev)); 1392 1393 /* build extension */ 1394 if (S_ISBLK(mode)) 1395 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1396 else if (S_ISCHR(mode)) 1397 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1398 else 1399 *name = 0; 1400 1401 perm = unixmode2p9mode(v9ses, mode); 1402 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1403 1404 return retval; 1405 } 1406 1407 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1408 { 1409 int umode; 1410 dev_t rdev; 1411 struct p9_wstat *st; 1412 struct v9fs_session_info *v9ses; 1413 unsigned int flags; 1414 1415 v9ses = v9fs_inode2v9ses(inode); 1416 st = p9_client_stat(fid); 1417 if (IS_ERR(st)) 1418 return PTR_ERR(st); 1419 /* 1420 * Don't update inode if the file type is different 1421 */ 1422 umode = p9mode2unixmode(v9ses, st, &rdev); 1423 if (inode_wrong_type(inode, umode)) 1424 goto out; 1425 1426 /* 1427 * We don't want to refresh inode->i_size, 1428 * because we may have cached data 1429 */ 1430 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1431 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1432 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1433 out: 1434 p9stat_free(st); 1435 kfree(st); 1436 return 0; 1437 } 1438 1439 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1440 .create = v9fs_vfs_create, 1441 .lookup = v9fs_vfs_lookup, 1442 .atomic_open = v9fs_vfs_atomic_open, 1443 .symlink = v9fs_vfs_symlink, 1444 .link = v9fs_vfs_link, 1445 .unlink = v9fs_vfs_unlink, 1446 .mkdir = v9fs_vfs_mkdir, 1447 .rmdir = v9fs_vfs_rmdir, 1448 .mknod = v9fs_vfs_mknod, 1449 .rename = v9fs_vfs_rename, 1450 .getattr = v9fs_vfs_getattr, 1451 .setattr = v9fs_vfs_setattr, 1452 }; 1453 1454 static const struct inode_operations v9fs_dir_inode_operations = { 1455 .create = v9fs_vfs_create, 1456 .lookup = v9fs_vfs_lookup, 1457 .atomic_open = v9fs_vfs_atomic_open, 1458 .unlink = v9fs_vfs_unlink, 1459 .mkdir = v9fs_vfs_mkdir, 1460 .rmdir = v9fs_vfs_rmdir, 1461 .mknod = v9fs_vfs_mknod, 1462 .rename = v9fs_vfs_rename, 1463 .getattr = v9fs_vfs_getattr, 1464 .setattr = v9fs_vfs_setattr, 1465 }; 1466 1467 static const struct inode_operations v9fs_file_inode_operations = { 1468 .getattr = v9fs_vfs_getattr, 1469 .setattr = v9fs_vfs_setattr, 1470 }; 1471 1472 static const struct inode_operations v9fs_symlink_inode_operations = { 1473 .get_link = v9fs_vfs_get_link, 1474 .getattr = v9fs_vfs_getattr, 1475 .setattr = v9fs_vfs_setattr, 1476 }; 1477 1478