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 if (v9inode->writeback_fid) { 403 p9_client_clunk(v9inode->writeback_fid); 404 v9inode->writeback_fid = NULL; 405 } 406 } 407 408 static int v9fs_test_inode(struct inode *inode, void *data) 409 { 410 int umode; 411 dev_t rdev; 412 struct v9fs_inode *v9inode = V9FS_I(inode); 413 struct p9_wstat *st = (struct p9_wstat *)data; 414 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 415 416 umode = p9mode2unixmode(v9ses, st, &rdev); 417 /* don't match inode of different type */ 418 if (inode_wrong_type(inode, umode)) 419 return 0; 420 421 /* compare qid details */ 422 if (memcmp(&v9inode->qid.version, 423 &st->qid.version, sizeof(v9inode->qid.version))) 424 return 0; 425 426 if (v9inode->qid.type != st->qid.type) 427 return 0; 428 429 if (v9inode->qid.path != st->qid.path) 430 return 0; 431 return 1; 432 } 433 434 static int v9fs_test_new_inode(struct inode *inode, void *data) 435 { 436 return 0; 437 } 438 439 static int v9fs_set_inode(struct inode *inode, void *data) 440 { 441 struct v9fs_inode *v9inode = V9FS_I(inode); 442 struct p9_wstat *st = (struct p9_wstat *)data; 443 444 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 445 return 0; 446 } 447 448 static struct inode *v9fs_qid_iget(struct super_block *sb, 449 struct p9_qid *qid, 450 struct p9_wstat *st, 451 int new) 452 { 453 dev_t rdev; 454 int retval; 455 umode_t umode; 456 unsigned long i_ino; 457 struct inode *inode; 458 struct v9fs_session_info *v9ses = sb->s_fs_info; 459 int (*test)(struct inode *inode, void *data); 460 461 if (new) 462 test = v9fs_test_new_inode; 463 else 464 test = v9fs_test_inode; 465 466 i_ino = v9fs_qid2ino(qid); 467 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 468 if (!inode) 469 return ERR_PTR(-ENOMEM); 470 if (!(inode->i_state & I_NEW)) 471 return inode; 472 /* 473 * initialize the inode with the stat info 474 * FIXME!! we may need support for stale inodes 475 * later. 476 */ 477 inode->i_ino = i_ino; 478 umode = p9mode2unixmode(v9ses, st, &rdev); 479 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 480 if (retval) 481 goto error; 482 483 v9fs_stat2inode(st, inode, sb, 0); 484 v9fs_cache_inode_get_cookie(inode); 485 unlock_new_inode(inode); 486 return inode; 487 error: 488 iget_failed(inode); 489 return ERR_PTR(retval); 490 491 } 492 493 struct inode * 494 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 495 struct super_block *sb, int new) 496 { 497 struct p9_wstat *st; 498 struct inode *inode = NULL; 499 500 st = p9_client_stat(fid); 501 if (IS_ERR(st)) 502 return ERR_CAST(st); 503 504 inode = v9fs_qid_iget(sb, &st->qid, st, new); 505 p9stat_free(st); 506 kfree(st); 507 return inode; 508 } 509 510 /** 511 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 512 * plan 9 AT flag. 513 * @flags: flags to convert 514 */ 515 static int v9fs_at_to_dotl_flags(int flags) 516 { 517 int rflags = 0; 518 519 if (flags & AT_REMOVEDIR) 520 rflags |= P9_DOTL_AT_REMOVEDIR; 521 522 return rflags; 523 } 524 525 /** 526 * v9fs_dec_count - helper functon to drop i_nlink. 527 * 528 * If a directory had nlink <= 2 (including . and ..), then we should not drop 529 * the link count, which indicates the underlying exported fs doesn't maintain 530 * nlink accurately. e.g. 531 * - overlayfs sets nlink to 1 for merged dir 532 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 533 * than EXT4_LINK_MAX (65000) links. 534 * 535 * @inode: inode whose nlink is being dropped 536 */ 537 static void v9fs_dec_count(struct inode *inode) 538 { 539 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 540 drop_nlink(inode); 541 } 542 543 /** 544 * v9fs_remove - helper function to remove files and directories 545 * @dir: directory inode that is being deleted 546 * @dentry: dentry that is being deleted 547 * @flags: removing a directory 548 * 549 */ 550 551 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 552 { 553 struct inode *inode; 554 int retval = -EOPNOTSUPP; 555 struct p9_fid *v9fid, *dfid; 556 struct v9fs_session_info *v9ses; 557 558 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 559 dir, dentry, flags); 560 561 v9ses = v9fs_inode2v9ses(dir); 562 inode = d_inode(dentry); 563 dfid = v9fs_parent_fid(dentry); 564 if (IS_ERR(dfid)) { 565 retval = PTR_ERR(dfid); 566 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 567 return retval; 568 } 569 if (v9fs_proto_dotl(v9ses)) 570 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 571 v9fs_at_to_dotl_flags(flags)); 572 p9_client_clunk(dfid); 573 if (retval == -EOPNOTSUPP) { 574 /* Try the one based on path */ 575 v9fid = v9fs_fid_clone(dentry); 576 if (IS_ERR(v9fid)) 577 return PTR_ERR(v9fid); 578 retval = p9_client_remove(v9fid); 579 } 580 if (!retval) { 581 /* 582 * directories on unlink should have zero 583 * link count 584 */ 585 if (flags & AT_REMOVEDIR) { 586 clear_nlink(inode); 587 v9fs_dec_count(dir); 588 } else 589 v9fs_dec_count(inode); 590 591 v9fs_invalidate_inode_attr(inode); 592 v9fs_invalidate_inode_attr(dir); 593 594 /* invalidate all fids associated with dentry */ 595 /* NOTE: This will not include open fids */ 596 dentry->d_op->d_release(dentry); 597 } 598 return retval; 599 } 600 601 /** 602 * v9fs_create - Create a file 603 * @v9ses: session information 604 * @dir: directory that dentry is being created in 605 * @dentry: dentry that is being created 606 * @extension: 9p2000.u extension string to support devices, etc. 607 * @perm: create permissions 608 * @mode: open mode 609 * 610 */ 611 static struct p9_fid * 612 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 613 struct dentry *dentry, char *extension, u32 perm, u8 mode) 614 { 615 int err; 616 const unsigned char *name; 617 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 618 struct inode *inode; 619 620 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 621 622 err = 0; 623 name = dentry->d_name.name; 624 dfid = v9fs_parent_fid(dentry); 625 if (IS_ERR(dfid)) { 626 err = PTR_ERR(dfid); 627 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 628 return ERR_PTR(err); 629 } 630 631 /* clone a fid to use for creation */ 632 ofid = clone_fid(dfid); 633 if (IS_ERR(ofid)) { 634 err = PTR_ERR(ofid); 635 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 636 p9_client_clunk(dfid); 637 return ERR_PTR(err); 638 } 639 640 err = p9_client_fcreate(ofid, name, perm, mode, extension); 641 if (err < 0) { 642 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 643 p9_client_clunk(dfid); 644 goto error; 645 } 646 647 if (!(perm & P9_DMLINK)) { 648 /* now walk from the parent so we can get unopened fid */ 649 fid = p9_client_walk(dfid, 1, &name, 1); 650 if (IS_ERR(fid)) { 651 err = PTR_ERR(fid); 652 p9_debug(P9_DEBUG_VFS, 653 "p9_client_walk failed %d\n", err); 654 fid = NULL; 655 p9_client_clunk(dfid); 656 goto error; 657 } 658 /* 659 * instantiate inode and assign the unopened fid to the dentry 660 */ 661 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 662 if (IS_ERR(inode)) { 663 err = PTR_ERR(inode); 664 p9_debug(P9_DEBUG_VFS, 665 "inode creation failed %d\n", err); 666 p9_client_clunk(dfid); 667 goto error; 668 } 669 v9fs_fid_add(dentry, fid); 670 d_instantiate(dentry, inode); 671 } 672 p9_client_clunk(dfid); 673 return ofid; 674 error: 675 if (ofid) 676 p9_client_clunk(ofid); 677 678 if (fid) 679 p9_client_clunk(fid); 680 681 return ERR_PTR(err); 682 } 683 684 /** 685 * v9fs_vfs_create - VFS hook to create a regular file 686 * @mnt_userns: The user namespace of the mount 687 * @dir: The parent directory 688 * @dentry: The name of file to be created 689 * @mode: The UNIX file mode to set 690 * @excl: True if the file must not yet exist 691 * 692 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 693 * for mknod(2). 694 * 695 */ 696 697 static int 698 v9fs_vfs_create(struct user_namespace *mnt_userns, struct inode *dir, 699 struct dentry *dentry, umode_t mode, bool excl) 700 { 701 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 702 u32 perm = unixmode2p9mode(v9ses, mode); 703 struct p9_fid *fid; 704 705 /* P9_OEXCL? */ 706 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 707 if (IS_ERR(fid)) 708 return PTR_ERR(fid); 709 710 v9fs_invalidate_inode_attr(dir); 711 p9_client_clunk(fid); 712 713 return 0; 714 } 715 716 /** 717 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 718 * @mnt_userns: The user namespace of the mount 719 * @dir: inode that is being unlinked 720 * @dentry: dentry that is being unlinked 721 * @mode: mode for new directory 722 * 723 */ 724 725 static int v9fs_vfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 726 struct dentry *dentry, umode_t mode) 727 { 728 int err; 729 u32 perm; 730 struct p9_fid *fid; 731 struct v9fs_session_info *v9ses; 732 733 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 734 err = 0; 735 v9ses = v9fs_inode2v9ses(dir); 736 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 737 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 738 if (IS_ERR(fid)) { 739 err = PTR_ERR(fid); 740 fid = NULL; 741 } else { 742 inc_nlink(dir); 743 v9fs_invalidate_inode_attr(dir); 744 } 745 746 if (fid) 747 p9_client_clunk(fid); 748 749 return err; 750 } 751 752 /** 753 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 754 * @dir: inode that is being walked from 755 * @dentry: dentry that is being walked to? 756 * @flags: lookup flags (unused) 757 * 758 */ 759 760 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 761 unsigned int flags) 762 { 763 struct dentry *res; 764 struct v9fs_session_info *v9ses; 765 struct p9_fid *dfid, *fid; 766 struct inode *inode; 767 const unsigned char *name; 768 769 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 770 dir, dentry, dentry, flags); 771 772 if (dentry->d_name.len > NAME_MAX) 773 return ERR_PTR(-ENAMETOOLONG); 774 775 v9ses = v9fs_inode2v9ses(dir); 776 /* We can walk d_parent because we hold the dir->i_mutex */ 777 dfid = v9fs_parent_fid(dentry); 778 if (IS_ERR(dfid)) 779 return ERR_CAST(dfid); 780 781 /* 782 * Make sure we don't use a wrong inode due to parallel 783 * unlink. For cached mode create calls request for new 784 * inode. But with cache disabled, lookup should do this. 785 */ 786 name = dentry->d_name.name; 787 fid = p9_client_walk(dfid, 1, &name, 1); 788 p9_client_clunk(dfid); 789 if (fid == ERR_PTR(-ENOENT)) 790 inode = NULL; 791 else if (IS_ERR(fid)) 792 inode = ERR_CAST(fid); 793 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 794 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 795 else 796 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 797 /* 798 * If we had a rename on the server and a parallel lookup 799 * for the new name, then make sure we instantiate with 800 * the new name. ie look up for a/b, while on server somebody 801 * moved b under k and client parallely did a lookup for 802 * k/b. 803 */ 804 res = d_splice_alias(inode, dentry); 805 if (!IS_ERR(fid)) { 806 if (!res) 807 v9fs_fid_add(dentry, fid); 808 else if (!IS_ERR(res)) 809 v9fs_fid_add(res, fid); 810 else 811 p9_client_clunk(fid); 812 } 813 return res; 814 } 815 816 static int 817 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 818 struct file *file, unsigned int flags, umode_t mode) 819 { 820 int err; 821 u32 perm; 822 struct v9fs_inode *v9inode; 823 struct v9fs_session_info *v9ses; 824 struct p9_fid *fid, *inode_fid; 825 struct dentry *res = NULL; 826 struct inode *inode; 827 828 if (d_in_lookup(dentry)) { 829 res = v9fs_vfs_lookup(dir, dentry, 0); 830 if (IS_ERR(res)) 831 return PTR_ERR(res); 832 833 if (res) 834 dentry = res; 835 } 836 837 /* Only creates */ 838 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 839 return finish_no_open(file, res); 840 841 err = 0; 842 843 v9ses = v9fs_inode2v9ses(dir); 844 perm = unixmode2p9mode(v9ses, mode); 845 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 846 v9fs_uflags2omode(flags, 847 v9fs_proto_dotu(v9ses))); 848 if (IS_ERR(fid)) { 849 err = PTR_ERR(fid); 850 fid = NULL; 851 goto error; 852 } 853 854 v9fs_invalidate_inode_attr(dir); 855 inode = d_inode(dentry); 856 v9inode = V9FS_I(inode); 857 mutex_lock(&v9inode->v_mutex); 858 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 859 !v9inode->writeback_fid && 860 ((flags & O_ACCMODE) != O_RDONLY)) { 861 /* 862 * clone a fid and add it to writeback_fid 863 * we do it during open time instead of 864 * page dirty time via write_begin/page_mkwrite 865 * because we want write after unlink usecase 866 * to work. 867 */ 868 inode_fid = v9fs_writeback_fid(dentry); 869 if (IS_ERR(inode_fid)) { 870 err = PTR_ERR(inode_fid); 871 mutex_unlock(&v9inode->v_mutex); 872 goto error; 873 } 874 v9inode->writeback_fid = (void *) inode_fid; 875 } 876 mutex_unlock(&v9inode->v_mutex); 877 err = finish_open(file, dentry, generic_file_open); 878 if (err) 879 goto error; 880 881 file->private_data = fid; 882 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 883 fscache_use_cookie(v9fs_inode_cookie(v9inode), 884 file->f_mode & FMODE_WRITE); 885 v9fs_open_fid_add(inode, fid); 886 887 file->f_mode |= FMODE_CREATED; 888 out: 889 dput(res); 890 return err; 891 892 error: 893 if (fid) 894 p9_client_clunk(fid); 895 goto out; 896 } 897 898 /** 899 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 900 * @i: inode that is being unlinked 901 * @d: dentry that is being unlinked 902 * 903 */ 904 905 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 906 { 907 return v9fs_remove(i, d, 0); 908 } 909 910 /** 911 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 912 * @i: inode that is being unlinked 913 * @d: dentry that is being unlinked 914 * 915 */ 916 917 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 918 { 919 return v9fs_remove(i, d, AT_REMOVEDIR); 920 } 921 922 /** 923 * v9fs_vfs_rename - VFS hook to rename an inode 924 * @mnt_userns: The user namespace of the mount 925 * @old_dir: old dir inode 926 * @old_dentry: old dentry 927 * @new_dir: new dir inode 928 * @new_dentry: new dentry 929 * @flags: RENAME_* flags 930 * 931 */ 932 933 int 934 v9fs_vfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 935 struct dentry *old_dentry, struct inode *new_dir, 936 struct dentry *new_dentry, unsigned int flags) 937 { 938 int retval; 939 struct inode *old_inode; 940 struct inode *new_inode; 941 struct v9fs_session_info *v9ses; 942 struct p9_fid *oldfid, *dfid; 943 struct p9_fid *olddirfid; 944 struct p9_fid *newdirfid; 945 struct p9_wstat wstat; 946 947 if (flags) 948 return -EINVAL; 949 950 p9_debug(P9_DEBUG_VFS, "\n"); 951 retval = 0; 952 old_inode = d_inode(old_dentry); 953 new_inode = d_inode(new_dentry); 954 v9ses = v9fs_inode2v9ses(old_inode); 955 oldfid = v9fs_fid_lookup(old_dentry); 956 if (IS_ERR(oldfid)) 957 return PTR_ERR(oldfid); 958 959 dfid = v9fs_parent_fid(old_dentry); 960 olddirfid = clone_fid(dfid); 961 if (dfid && !IS_ERR(dfid)) 962 p9_client_clunk(dfid); 963 964 if (IS_ERR(olddirfid)) { 965 retval = PTR_ERR(olddirfid); 966 goto done; 967 } 968 969 dfid = v9fs_parent_fid(new_dentry); 970 newdirfid = clone_fid(dfid); 971 p9_client_clunk(dfid); 972 973 if (IS_ERR(newdirfid)) { 974 retval = PTR_ERR(newdirfid); 975 goto clunk_olddir; 976 } 977 978 down_write(&v9ses->rename_sem); 979 if (v9fs_proto_dotl(v9ses)) { 980 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 981 newdirfid, new_dentry->d_name.name); 982 if (retval == -EOPNOTSUPP) 983 retval = p9_client_rename(oldfid, newdirfid, 984 new_dentry->d_name.name); 985 if (retval != -EOPNOTSUPP) 986 goto clunk_newdir; 987 } 988 if (old_dentry->d_parent != new_dentry->d_parent) { 989 /* 990 * 9P .u can only handle file rename in the same directory 991 */ 992 993 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 994 retval = -EXDEV; 995 goto clunk_newdir; 996 } 997 v9fs_blank_wstat(&wstat); 998 wstat.muid = v9ses->uname; 999 wstat.name = new_dentry->d_name.name; 1000 retval = p9_client_wstat(oldfid, &wstat); 1001 1002 clunk_newdir: 1003 if (!retval) { 1004 if (new_inode) { 1005 if (S_ISDIR(new_inode->i_mode)) 1006 clear_nlink(new_inode); 1007 else 1008 v9fs_dec_count(new_inode); 1009 } 1010 if (S_ISDIR(old_inode->i_mode)) { 1011 if (!new_inode) 1012 inc_nlink(new_dir); 1013 v9fs_dec_count(old_dir); 1014 } 1015 v9fs_invalidate_inode_attr(old_inode); 1016 v9fs_invalidate_inode_attr(old_dir); 1017 v9fs_invalidate_inode_attr(new_dir); 1018 1019 /* successful rename */ 1020 d_move(old_dentry, new_dentry); 1021 } 1022 up_write(&v9ses->rename_sem); 1023 p9_client_clunk(newdirfid); 1024 1025 clunk_olddir: 1026 p9_client_clunk(olddirfid); 1027 1028 done: 1029 p9_client_clunk(oldfid); 1030 return retval; 1031 } 1032 1033 /** 1034 * v9fs_vfs_getattr - retrieve file metadata 1035 * @mnt_userns: The user namespace of the mount 1036 * @path: Object to query 1037 * @stat: metadata structure to populate 1038 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1039 * @flags: AT_STATX_xxx setting 1040 * 1041 */ 1042 1043 static int 1044 v9fs_vfs_getattr(struct user_namespace *mnt_userns, const struct path *path, 1045 struct kstat *stat, u32 request_mask, unsigned int flags) 1046 { 1047 struct dentry *dentry = path->dentry; 1048 struct v9fs_session_info *v9ses; 1049 struct p9_fid *fid; 1050 struct p9_wstat *st; 1051 1052 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1053 v9ses = v9fs_dentry2v9ses(dentry); 1054 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1055 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1056 return 0; 1057 } 1058 fid = v9fs_fid_lookup(dentry); 1059 if (IS_ERR(fid)) 1060 return PTR_ERR(fid); 1061 1062 st = p9_client_stat(fid); 1063 p9_client_clunk(fid); 1064 if (IS_ERR(st)) 1065 return PTR_ERR(st); 1066 1067 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1068 generic_fillattr(&init_user_ns, d_inode(dentry), stat); 1069 1070 p9stat_free(st); 1071 kfree(st); 1072 return 0; 1073 } 1074 1075 /** 1076 * v9fs_vfs_setattr - set file metadata 1077 * @mnt_userns: The user namespace of the mount 1078 * @dentry: file whose metadata to set 1079 * @iattr: metadata assignment structure 1080 * 1081 */ 1082 1083 static int v9fs_vfs_setattr(struct user_namespace *mnt_userns, 1084 struct dentry *dentry, struct iattr *iattr) 1085 { 1086 int retval, use_dentry = 0; 1087 struct inode *inode = d_inode(dentry); 1088 struct v9fs_inode *v9inode = V9FS_I(inode); 1089 struct v9fs_session_info *v9ses; 1090 struct p9_fid *fid = NULL; 1091 struct p9_wstat wstat; 1092 1093 p9_debug(P9_DEBUG_VFS, "\n"); 1094 retval = setattr_prepare(&init_user_ns, dentry, iattr); 1095 if (retval) 1096 return retval; 1097 1098 retval = -EPERM; 1099 v9ses = v9fs_dentry2v9ses(dentry); 1100 if (iattr->ia_valid & ATTR_FILE) { 1101 fid = iattr->ia_file->private_data; 1102 WARN_ON(!fid); 1103 } 1104 if (!fid) { 1105 fid = v9fs_fid_lookup(dentry); 1106 use_dentry = 1; 1107 } 1108 if (IS_ERR(fid)) 1109 return PTR_ERR(fid); 1110 1111 v9fs_blank_wstat(&wstat); 1112 if (iattr->ia_valid & ATTR_MODE) 1113 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1114 1115 if (iattr->ia_valid & ATTR_MTIME) 1116 wstat.mtime = iattr->ia_mtime.tv_sec; 1117 1118 if (iattr->ia_valid & ATTR_ATIME) 1119 wstat.atime = iattr->ia_atime.tv_sec; 1120 1121 if (iattr->ia_valid & ATTR_SIZE) 1122 wstat.length = iattr->ia_size; 1123 1124 if (v9fs_proto_dotu(v9ses)) { 1125 if (iattr->ia_valid & ATTR_UID) 1126 wstat.n_uid = iattr->ia_uid; 1127 1128 if (iattr->ia_valid & ATTR_GID) 1129 wstat.n_gid = iattr->ia_gid; 1130 } 1131 1132 /* Write all dirty data */ 1133 if (d_is_reg(dentry)) 1134 filemap_write_and_wait(inode->i_mapping); 1135 1136 retval = p9_client_wstat(fid, &wstat); 1137 1138 if (use_dentry) 1139 p9_client_clunk(fid); 1140 1141 if (retval < 0) 1142 return retval; 1143 1144 if ((iattr->ia_valid & ATTR_SIZE) && 1145 iattr->ia_size != i_size_read(inode)) { 1146 truncate_setsize(inode, iattr->ia_size); 1147 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1148 } 1149 1150 v9fs_invalidate_inode_attr(inode); 1151 1152 setattr_copy(&init_user_ns, inode, iattr); 1153 mark_inode_dirty(inode); 1154 return 0; 1155 } 1156 1157 /** 1158 * v9fs_stat2inode - populate an inode structure with mistat info 1159 * @stat: Plan 9 metadata (mistat) structure 1160 * @inode: inode to populate 1161 * @sb: superblock of filesystem 1162 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1163 * 1164 */ 1165 1166 void 1167 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1168 struct super_block *sb, unsigned int flags) 1169 { 1170 umode_t mode; 1171 struct v9fs_session_info *v9ses = sb->s_fs_info; 1172 struct v9fs_inode *v9inode = V9FS_I(inode); 1173 1174 set_nlink(inode, 1); 1175 1176 inode->i_atime.tv_sec = stat->atime; 1177 inode->i_mtime.tv_sec = stat->mtime; 1178 inode->i_ctime.tv_sec = stat->mtime; 1179 1180 inode->i_uid = v9ses->dfltuid; 1181 inode->i_gid = v9ses->dfltgid; 1182 1183 if (v9fs_proto_dotu(v9ses)) { 1184 inode->i_uid = stat->n_uid; 1185 inode->i_gid = stat->n_gid; 1186 } 1187 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1188 if (v9fs_proto_dotu(v9ses)) { 1189 unsigned int i_nlink; 1190 /* 1191 * Hadlink support got added later to the .u extension. 1192 * So there can be a server out there that doesn't 1193 * support this even with .u extension. That would 1194 * just leave us with stat->extension being an empty 1195 * string, though. 1196 */ 1197 /* HARDLINKCOUNT %u */ 1198 if (sscanf(stat->extension, 1199 " HARDLINKCOUNT %u", &i_nlink) == 1) 1200 set_nlink(inode, i_nlink); 1201 } 1202 } 1203 mode = p9mode2perm(v9ses, stat); 1204 mode |= inode->i_mode & ~S_IALLUGO; 1205 inode->i_mode = mode; 1206 1207 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1208 v9fs_i_size_write(inode, stat->length); 1209 /* not real number of blocks, but 512 byte ones ... */ 1210 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1211 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1212 } 1213 1214 /** 1215 * v9fs_qid2ino - convert qid into inode number 1216 * @qid: qid to hash 1217 * 1218 * BUG: potential for inode number collisions? 1219 */ 1220 1221 ino_t v9fs_qid2ino(struct p9_qid *qid) 1222 { 1223 u64 path = qid->path + 2; 1224 ino_t i = 0; 1225 1226 if (sizeof(ino_t) == sizeof(path)) 1227 memcpy(&i, &path, sizeof(ino_t)); 1228 else 1229 i = (ino_t) (path ^ (path >> 32)); 1230 1231 return i; 1232 } 1233 1234 /** 1235 * v9fs_vfs_get_link - follow a symlink path 1236 * @dentry: dentry for symlink 1237 * @inode: inode for symlink 1238 * @done: delayed call for when we are done with the return value 1239 */ 1240 1241 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1242 struct inode *inode, 1243 struct delayed_call *done) 1244 { 1245 struct v9fs_session_info *v9ses; 1246 struct p9_fid *fid; 1247 struct p9_wstat *st; 1248 char *res; 1249 1250 if (!dentry) 1251 return ERR_PTR(-ECHILD); 1252 1253 v9ses = v9fs_dentry2v9ses(dentry); 1254 if (!v9fs_proto_dotu(v9ses)) 1255 return ERR_PTR(-EBADF); 1256 1257 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1258 fid = v9fs_fid_lookup(dentry); 1259 1260 if (IS_ERR(fid)) 1261 return ERR_CAST(fid); 1262 1263 st = p9_client_stat(fid); 1264 p9_client_clunk(fid); 1265 if (IS_ERR(st)) 1266 return ERR_CAST(st); 1267 1268 if (!(st->mode & P9_DMSYMLINK)) { 1269 p9stat_free(st); 1270 kfree(st); 1271 return ERR_PTR(-EINVAL); 1272 } 1273 res = st->extension; 1274 st->extension = NULL; 1275 if (strlen(res) >= PATH_MAX) 1276 res[PATH_MAX - 1] = '\0'; 1277 1278 p9stat_free(st); 1279 kfree(st); 1280 set_delayed_call(done, kfree_link, res); 1281 return res; 1282 } 1283 1284 /** 1285 * v9fs_vfs_mkspecial - create a special file 1286 * @dir: inode to create special file in 1287 * @dentry: dentry to create 1288 * @perm: mode to create special file 1289 * @extension: 9p2000.u format extension string representing special file 1290 * 1291 */ 1292 1293 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1294 u32 perm, const char *extension) 1295 { 1296 struct p9_fid *fid; 1297 struct v9fs_session_info *v9ses; 1298 1299 v9ses = v9fs_inode2v9ses(dir); 1300 if (!v9fs_proto_dotu(v9ses)) { 1301 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1302 return -EPERM; 1303 } 1304 1305 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1306 P9_OREAD); 1307 if (IS_ERR(fid)) 1308 return PTR_ERR(fid); 1309 1310 v9fs_invalidate_inode_attr(dir); 1311 p9_client_clunk(fid); 1312 return 0; 1313 } 1314 1315 /** 1316 * v9fs_vfs_symlink - helper function to create symlinks 1317 * @mnt_userns: The user namespace of the mount 1318 * @dir: directory inode containing symlink 1319 * @dentry: dentry for symlink 1320 * @symname: symlink data 1321 * 1322 * See Also: 9P2000.u RFC for more information 1323 * 1324 */ 1325 1326 static int 1327 v9fs_vfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 1328 struct dentry *dentry, const char *symname) 1329 { 1330 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1331 dir->i_ino, dentry, symname); 1332 1333 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1334 } 1335 1336 #define U32_MAX_DIGITS 10 1337 1338 /** 1339 * v9fs_vfs_link - create a hardlink 1340 * @old_dentry: dentry for file to link to 1341 * @dir: inode destination for new link 1342 * @dentry: dentry for link 1343 * 1344 */ 1345 1346 static int 1347 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1348 struct dentry *dentry) 1349 { 1350 int retval; 1351 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1352 struct p9_fid *oldfid; 1353 1354 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1355 dir->i_ino, dentry, old_dentry); 1356 1357 oldfid = v9fs_fid_clone(old_dentry); 1358 if (IS_ERR(oldfid)) 1359 return PTR_ERR(oldfid); 1360 1361 sprintf(name, "%d\n", oldfid->fid); 1362 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1363 if (!retval) { 1364 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1365 v9fs_invalidate_inode_attr(dir); 1366 } 1367 p9_client_clunk(oldfid); 1368 return retval; 1369 } 1370 1371 /** 1372 * v9fs_vfs_mknod - create a special file 1373 * @mnt_userns: The user namespace of the mount 1374 * @dir: inode destination for new link 1375 * @dentry: dentry for file 1376 * @mode: mode for creation 1377 * @rdev: device associated with special file 1378 * 1379 */ 1380 1381 static int 1382 v9fs_vfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 1383 struct dentry *dentry, umode_t mode, dev_t rdev) 1384 { 1385 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1386 int retval; 1387 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1388 u32 perm; 1389 1390 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1391 dir->i_ino, dentry, mode, 1392 MAJOR(rdev), MINOR(rdev)); 1393 1394 /* build extension */ 1395 if (S_ISBLK(mode)) 1396 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1397 else if (S_ISCHR(mode)) 1398 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1399 else 1400 *name = 0; 1401 1402 perm = unixmode2p9mode(v9ses, mode); 1403 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1404 1405 return retval; 1406 } 1407 1408 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1409 { 1410 int umode; 1411 dev_t rdev; 1412 struct p9_wstat *st; 1413 struct v9fs_session_info *v9ses; 1414 unsigned int flags; 1415 1416 v9ses = v9fs_inode2v9ses(inode); 1417 st = p9_client_stat(fid); 1418 if (IS_ERR(st)) 1419 return PTR_ERR(st); 1420 /* 1421 * Don't update inode if the file type is different 1422 */ 1423 umode = p9mode2unixmode(v9ses, st, &rdev); 1424 if (inode_wrong_type(inode, umode)) 1425 goto out; 1426 1427 /* 1428 * We don't want to refresh inode->i_size, 1429 * because we may have cached data 1430 */ 1431 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1432 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1433 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1434 out: 1435 p9stat_free(st); 1436 kfree(st); 1437 return 0; 1438 } 1439 1440 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1441 .create = v9fs_vfs_create, 1442 .lookup = v9fs_vfs_lookup, 1443 .atomic_open = v9fs_vfs_atomic_open, 1444 .symlink = v9fs_vfs_symlink, 1445 .link = v9fs_vfs_link, 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_dir_inode_operations = { 1456 .create = v9fs_vfs_create, 1457 .lookup = v9fs_vfs_lookup, 1458 .atomic_open = v9fs_vfs_atomic_open, 1459 .unlink = v9fs_vfs_unlink, 1460 .mkdir = v9fs_vfs_mkdir, 1461 .rmdir = v9fs_vfs_rmdir, 1462 .mknod = v9fs_vfs_mknod, 1463 .rename = v9fs_vfs_rename, 1464 .getattr = v9fs_vfs_getattr, 1465 .setattr = v9fs_vfs_setattr, 1466 }; 1467 1468 static const struct inode_operations v9fs_file_inode_operations = { 1469 .getattr = v9fs_vfs_getattr, 1470 .setattr = v9fs_vfs_setattr, 1471 }; 1472 1473 static const struct inode_operations v9fs_symlink_inode_operations = { 1474 .get_link = v9fs_vfs_get_link, 1475 .getattr = v9fs_vfs_getattr, 1476 .setattr = v9fs_vfs_setattr, 1477 }; 1478 1479