1 /* 2 * linux/fs/9p/vfs_inode.c 3 * 4 * This file contains vfs inode ops for the 9P2000 protocol. 5 * 6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/file.h> 32 #include <linux/pagemap.h> 33 #include <linux/stat.h> 34 #include <linux/string.h> 35 #include <linux/inet.h> 36 #include <linux/namei.h> 37 #include <linux/idr.h> 38 #include <linux/sched.h> 39 #include <linux/slab.h> 40 #include <linux/xattr.h> 41 #include <linux/posix_acl.h> 42 #include <net/9p/9p.h> 43 #include <net/9p/client.h> 44 45 #include "v9fs.h" 46 #include "v9fs_vfs.h" 47 #include "fid.h" 48 #include "cache.h" 49 #include "xattr.h" 50 #include "acl.h" 51 52 static const struct inode_operations v9fs_dir_inode_operations; 53 static const struct inode_operations v9fs_dir_inode_operations_dotu; 54 static const struct inode_operations v9fs_file_inode_operations; 55 static const struct inode_operations v9fs_symlink_inode_operations; 56 57 /** 58 * unixmode2p9mode - convert unix mode bits to plan 9 59 * @v9ses: v9fs session information 60 * @mode: mode to convert 61 * 62 */ 63 64 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 65 { 66 int res; 67 res = mode & 0777; 68 if (S_ISDIR(mode)) 69 res |= P9_DMDIR; 70 if (v9fs_proto_dotu(v9ses)) { 71 if (v9ses->nodev == 0) { 72 if (S_ISSOCK(mode)) 73 res |= P9_DMSOCKET; 74 if (S_ISFIFO(mode)) 75 res |= P9_DMNAMEDPIPE; 76 if (S_ISBLK(mode)) 77 res |= P9_DMDEVICE; 78 if (S_ISCHR(mode)) 79 res |= P9_DMDEVICE; 80 } 81 82 if ((mode & S_ISUID) == S_ISUID) 83 res |= P9_DMSETUID; 84 if ((mode & S_ISGID) == S_ISGID) 85 res |= P9_DMSETGID; 86 if ((mode & S_ISVTX) == S_ISVTX) 87 res |= P9_DMSETVTX; 88 } 89 return res; 90 } 91 92 /** 93 * p9mode2perm- convert plan9 mode bits to unix permission bits 94 * @v9ses: v9fs session information 95 * @stat: p9_wstat from which mode need to be derived 96 * 97 */ 98 static int p9mode2perm(struct v9fs_session_info *v9ses, 99 struct p9_wstat *stat) 100 { 101 int res; 102 int mode = stat->mode; 103 104 res = mode & S_IALLUGO; 105 if (v9fs_proto_dotu(v9ses)) { 106 if ((mode & P9_DMSETUID) == P9_DMSETUID) 107 res |= S_ISUID; 108 109 if ((mode & P9_DMSETGID) == P9_DMSETGID) 110 res |= S_ISGID; 111 112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 113 res |= S_ISVTX; 114 } 115 return res; 116 } 117 118 /** 119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 120 * @v9ses: v9fs session information 121 * @stat: p9_wstat from which mode need to be derived 122 * @rdev: major number, minor number in case of device files. 123 * 124 */ 125 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 126 struct p9_wstat *stat, dev_t *rdev) 127 { 128 int res; 129 u32 mode = stat->mode; 130 131 *rdev = 0; 132 res = p9mode2perm(v9ses, stat); 133 134 if ((mode & P9_DMDIR) == P9_DMDIR) 135 res |= S_IFDIR; 136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 137 res |= S_IFLNK; 138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 139 && (v9ses->nodev == 0)) 140 res |= S_IFSOCK; 141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 142 && (v9ses->nodev == 0)) 143 res |= S_IFIFO; 144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 145 && (v9ses->nodev == 0)) { 146 char type = 0, ext[32]; 147 int major = -1, minor = -1; 148 149 strlcpy(ext, stat->extension, sizeof(ext)); 150 sscanf(ext, "%c %i %i", &type, &major, &minor); 151 switch (type) { 152 case 'c': 153 res |= S_IFCHR; 154 break; 155 case 'b': 156 res |= S_IFBLK; 157 break; 158 default: 159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 160 type, stat->extension); 161 }; 162 *rdev = MKDEV(major, minor); 163 } else 164 res |= S_IFREG; 165 166 return res; 167 } 168 169 /** 170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 171 * @uflags: flags to convert 172 * @extended: if .u extensions are active 173 */ 174 175 int v9fs_uflags2omode(int uflags, int extended) 176 { 177 int ret; 178 179 ret = 0; 180 switch (uflags&3) { 181 default: 182 case O_RDONLY: 183 ret = P9_OREAD; 184 break; 185 186 case O_WRONLY: 187 ret = P9_OWRITE; 188 break; 189 190 case O_RDWR: 191 ret = P9_ORDWR; 192 break; 193 } 194 195 if (extended) { 196 if (uflags & O_EXCL) 197 ret |= P9_OEXCL; 198 199 if (uflags & O_APPEND) 200 ret |= P9_OAPPEND; 201 } 202 203 return ret; 204 } 205 206 /** 207 * v9fs_blank_wstat - helper function to setup a 9P stat structure 208 * @wstat: structure to initialize 209 * 210 */ 211 212 void 213 v9fs_blank_wstat(struct p9_wstat *wstat) 214 { 215 wstat->type = ~0; 216 wstat->dev = ~0; 217 wstat->qid.type = ~0; 218 wstat->qid.version = ~0; 219 *((long long *)&wstat->qid.path) = ~0; 220 wstat->mode = ~0; 221 wstat->atime = ~0; 222 wstat->mtime = ~0; 223 wstat->length = ~0; 224 wstat->name = NULL; 225 wstat->uid = NULL; 226 wstat->gid = NULL; 227 wstat->muid = NULL; 228 wstat->n_uid = INVALID_UID; 229 wstat->n_gid = INVALID_GID; 230 wstat->n_muid = INVALID_UID; 231 wstat->extension = NULL; 232 } 233 234 /** 235 * v9fs_alloc_inode - helper function to allocate an inode 236 * 237 */ 238 struct inode *v9fs_alloc_inode(struct super_block *sb) 239 { 240 struct v9fs_inode *v9inode; 241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 242 GFP_KERNEL); 243 if (!v9inode) 244 return NULL; 245 #ifdef CONFIG_9P_FSCACHE 246 v9inode->fscache = NULL; 247 mutex_init(&v9inode->fscache_lock); 248 #endif 249 v9inode->writeback_fid = NULL; 250 v9inode->cache_validity = 0; 251 mutex_init(&v9inode->v_mutex); 252 return &v9inode->vfs_inode; 253 } 254 255 /** 256 * v9fs_destroy_inode - destroy an inode 257 * 258 */ 259 260 static void v9fs_i_callback(struct rcu_head *head) 261 { 262 struct inode *inode = container_of(head, struct inode, i_rcu); 263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 264 } 265 266 void v9fs_destroy_inode(struct inode *inode) 267 { 268 call_rcu(&inode->i_rcu, v9fs_i_callback); 269 } 270 271 int v9fs_init_inode(struct v9fs_session_info *v9ses, 272 struct inode *inode, umode_t mode, dev_t rdev) 273 { 274 int err = 0; 275 276 inode_init_owner(inode, NULL, mode); 277 inode->i_blocks = 0; 278 inode->i_rdev = rdev; 279 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 280 inode->i_mapping->a_ops = &v9fs_addr_operations; 281 282 switch (mode & S_IFMT) { 283 case S_IFIFO: 284 case S_IFBLK: 285 case S_IFCHR: 286 case S_IFSOCK: 287 if (v9fs_proto_dotl(v9ses)) { 288 inode->i_op = &v9fs_file_inode_operations_dotl; 289 } else if (v9fs_proto_dotu(v9ses)) { 290 inode->i_op = &v9fs_file_inode_operations; 291 } else { 292 p9_debug(P9_DEBUG_ERROR, 293 "special files without extended mode\n"); 294 err = -EINVAL; 295 goto error; 296 } 297 init_special_inode(inode, inode->i_mode, inode->i_rdev); 298 break; 299 case S_IFREG: 300 if (v9fs_proto_dotl(v9ses)) { 301 inode->i_op = &v9fs_file_inode_operations_dotl; 302 if (v9ses->cache == CACHE_LOOSE || 303 v9ses->cache == CACHE_FSCACHE) 304 inode->i_fop = 305 &v9fs_cached_file_operations_dotl; 306 else if (v9ses->cache == CACHE_MMAP) 307 inode->i_fop = &v9fs_mmap_file_operations_dotl; 308 else 309 inode->i_fop = &v9fs_file_operations_dotl; 310 } else { 311 inode->i_op = &v9fs_file_inode_operations; 312 if (v9ses->cache == CACHE_LOOSE || 313 v9ses->cache == CACHE_FSCACHE) 314 inode->i_fop = 315 &v9fs_cached_file_operations; 316 else if (v9ses->cache == CACHE_MMAP) 317 inode->i_fop = &v9fs_mmap_file_operations; 318 else 319 inode->i_fop = &v9fs_file_operations; 320 } 321 322 break; 323 case S_IFLNK: 324 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 325 p9_debug(P9_DEBUG_ERROR, 326 "extended modes used with legacy protocol\n"); 327 err = -EINVAL; 328 goto error; 329 } 330 331 if (v9fs_proto_dotl(v9ses)) 332 inode->i_op = &v9fs_symlink_inode_operations_dotl; 333 else 334 inode->i_op = &v9fs_symlink_inode_operations; 335 336 break; 337 case S_IFDIR: 338 inc_nlink(inode); 339 if (v9fs_proto_dotl(v9ses)) 340 inode->i_op = &v9fs_dir_inode_operations_dotl; 341 else if (v9fs_proto_dotu(v9ses)) 342 inode->i_op = &v9fs_dir_inode_operations_dotu; 343 else 344 inode->i_op = &v9fs_dir_inode_operations; 345 346 if (v9fs_proto_dotl(v9ses)) 347 inode->i_fop = &v9fs_dir_operations_dotl; 348 else 349 inode->i_fop = &v9fs_dir_operations; 350 351 break; 352 default: 353 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 354 mode, mode & S_IFMT); 355 err = -EINVAL; 356 goto error; 357 } 358 error: 359 return err; 360 361 } 362 363 /** 364 * v9fs_get_inode - helper function to setup an inode 365 * @sb: superblock 366 * @mode: mode to setup inode with 367 * 368 */ 369 370 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 371 { 372 int err; 373 struct inode *inode; 374 struct v9fs_session_info *v9ses = sb->s_fs_info; 375 376 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 377 378 inode = new_inode(sb); 379 if (!inode) { 380 pr_warn("%s (%d): Problem allocating inode\n", 381 __func__, task_pid_nr(current)); 382 return ERR_PTR(-ENOMEM); 383 } 384 err = v9fs_init_inode(v9ses, inode, mode, rdev); 385 if (err) { 386 iput(inode); 387 return ERR_PTR(err); 388 } 389 return inode; 390 } 391 392 /* 393 static struct v9fs_fid* 394 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 395 { 396 int err; 397 int nfid; 398 struct v9fs_fid *ret; 399 struct v9fs_fcall *fcall; 400 401 nfid = v9fs_get_idpool(&v9ses->fidpool); 402 if (nfid < 0) { 403 eprintk(KERN_WARNING, "no free fids available\n"); 404 return ERR_PTR(-ENOSPC); 405 } 406 407 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 408 &fcall); 409 410 if (err < 0) { 411 if (fcall && fcall->id == RWALK) 412 goto clunk_fid; 413 414 PRINT_FCALL_ERROR("walk error", fcall); 415 v9fs_put_idpool(nfid, &v9ses->fidpool); 416 goto error; 417 } 418 419 kfree(fcall); 420 fcall = NULL; 421 ret = v9fs_fid_create(v9ses, nfid); 422 if (!ret) { 423 err = -ENOMEM; 424 goto clunk_fid; 425 } 426 427 err = v9fs_fid_insert(ret, dentry); 428 if (err < 0) { 429 v9fs_fid_destroy(ret); 430 goto clunk_fid; 431 } 432 433 return ret; 434 435 clunk_fid: 436 v9fs_t_clunk(v9ses, nfid); 437 438 error: 439 kfree(fcall); 440 return ERR_PTR(err); 441 } 442 */ 443 444 445 /** 446 * v9fs_clear_inode - release an inode 447 * @inode: inode to release 448 * 449 */ 450 void v9fs_evict_inode(struct inode *inode) 451 { 452 struct v9fs_inode *v9inode = V9FS_I(inode); 453 454 truncate_inode_pages_final(&inode->i_data); 455 clear_inode(inode); 456 filemap_fdatawrite(&inode->i_data); 457 458 v9fs_cache_inode_put_cookie(inode); 459 /* clunk the fid stashed in writeback_fid */ 460 if (v9inode->writeback_fid) { 461 p9_client_clunk(v9inode->writeback_fid); 462 v9inode->writeback_fid = NULL; 463 } 464 } 465 466 static int v9fs_test_inode(struct inode *inode, void *data) 467 { 468 int umode; 469 dev_t rdev; 470 struct v9fs_inode *v9inode = V9FS_I(inode); 471 struct p9_wstat *st = (struct p9_wstat *)data; 472 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 473 474 umode = p9mode2unixmode(v9ses, st, &rdev); 475 /* don't match inode of different type */ 476 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 477 return 0; 478 479 /* compare qid details */ 480 if (memcmp(&v9inode->qid.version, 481 &st->qid.version, sizeof(v9inode->qid.version))) 482 return 0; 483 484 if (v9inode->qid.type != st->qid.type) 485 return 0; 486 487 if (v9inode->qid.path != st->qid.path) 488 return 0; 489 return 1; 490 } 491 492 static int v9fs_test_new_inode(struct inode *inode, void *data) 493 { 494 return 0; 495 } 496 497 static int v9fs_set_inode(struct inode *inode, void *data) 498 { 499 struct v9fs_inode *v9inode = V9FS_I(inode); 500 struct p9_wstat *st = (struct p9_wstat *)data; 501 502 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 503 return 0; 504 } 505 506 static struct inode *v9fs_qid_iget(struct super_block *sb, 507 struct p9_qid *qid, 508 struct p9_wstat *st, 509 int new) 510 { 511 dev_t rdev; 512 int retval; 513 umode_t umode; 514 unsigned long i_ino; 515 struct inode *inode; 516 struct v9fs_session_info *v9ses = sb->s_fs_info; 517 int (*test)(struct inode *, void *); 518 519 if (new) 520 test = v9fs_test_new_inode; 521 else 522 test = v9fs_test_inode; 523 524 i_ino = v9fs_qid2ino(qid); 525 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 526 if (!inode) 527 return ERR_PTR(-ENOMEM); 528 if (!(inode->i_state & I_NEW)) 529 return inode; 530 /* 531 * initialize the inode with the stat info 532 * FIXME!! we may need support for stale inodes 533 * later. 534 */ 535 inode->i_ino = i_ino; 536 umode = p9mode2unixmode(v9ses, st, &rdev); 537 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 538 if (retval) 539 goto error; 540 541 v9fs_stat2inode(st, inode, sb); 542 v9fs_cache_inode_get_cookie(inode); 543 unlock_new_inode(inode); 544 return inode; 545 error: 546 iget_failed(inode); 547 return ERR_PTR(retval); 548 549 } 550 551 struct inode * 552 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 553 struct super_block *sb, int new) 554 { 555 struct p9_wstat *st; 556 struct inode *inode = NULL; 557 558 st = p9_client_stat(fid); 559 if (IS_ERR(st)) 560 return ERR_CAST(st); 561 562 inode = v9fs_qid_iget(sb, &st->qid, st, new); 563 p9stat_free(st); 564 kfree(st); 565 return inode; 566 } 567 568 /** 569 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 570 * plan 9 AT flag. 571 * @flags: flags to convert 572 */ 573 static int v9fs_at_to_dotl_flags(int flags) 574 { 575 int rflags = 0; 576 if (flags & AT_REMOVEDIR) 577 rflags |= P9_DOTL_AT_REMOVEDIR; 578 return rflags; 579 } 580 581 /** 582 * v9fs_dec_count - helper functon to drop i_nlink. 583 * 584 * If a directory had nlink <= 2 (including . and ..), then we should not drop 585 * the link count, which indicates the underlying exported fs doesn't maintain 586 * nlink accurately. e.g. 587 * - overlayfs sets nlink to 1 for merged dir 588 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 589 * than EXT4_LINK_MAX (65000) links. 590 * 591 * @inode: inode whose nlink is being dropped 592 */ 593 static void v9fs_dec_count(struct inode *inode) 594 { 595 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 596 drop_nlink(inode); 597 } 598 599 /** 600 * v9fs_remove - helper function to remove files and directories 601 * @dir: directory inode that is being deleted 602 * @dentry: dentry that is being deleted 603 * @flags: removing a directory 604 * 605 */ 606 607 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 608 { 609 struct inode *inode; 610 int retval = -EOPNOTSUPP; 611 struct p9_fid *v9fid, *dfid; 612 struct v9fs_session_info *v9ses; 613 614 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 615 dir, dentry, flags); 616 617 v9ses = v9fs_inode2v9ses(dir); 618 inode = d_inode(dentry); 619 dfid = v9fs_parent_fid(dentry); 620 if (IS_ERR(dfid)) { 621 retval = PTR_ERR(dfid); 622 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 623 return retval; 624 } 625 if (v9fs_proto_dotl(v9ses)) 626 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 627 v9fs_at_to_dotl_flags(flags)); 628 if (retval == -EOPNOTSUPP) { 629 /* Try the one based on path */ 630 v9fid = v9fs_fid_clone(dentry); 631 if (IS_ERR(v9fid)) 632 return PTR_ERR(v9fid); 633 retval = p9_client_remove(v9fid); 634 } 635 if (!retval) { 636 /* 637 * directories on unlink should have zero 638 * link count 639 */ 640 if (flags & AT_REMOVEDIR) { 641 clear_nlink(inode); 642 v9fs_dec_count(dir); 643 } else 644 v9fs_dec_count(inode); 645 646 v9fs_invalidate_inode_attr(inode); 647 v9fs_invalidate_inode_attr(dir); 648 } 649 return retval; 650 } 651 652 /** 653 * v9fs_create - Create a file 654 * @v9ses: session information 655 * @dir: directory that dentry is being created in 656 * @dentry: dentry that is being created 657 * @extension: 9p2000.u extension string to support devices, etc. 658 * @perm: create permissions 659 * @mode: open mode 660 * 661 */ 662 static struct p9_fid * 663 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 664 struct dentry *dentry, char *extension, u32 perm, u8 mode) 665 { 666 int err; 667 const unsigned char *name; 668 struct p9_fid *dfid, *ofid, *fid; 669 struct inode *inode; 670 671 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 672 673 err = 0; 674 ofid = NULL; 675 fid = NULL; 676 name = dentry->d_name.name; 677 dfid = v9fs_parent_fid(dentry); 678 if (IS_ERR(dfid)) { 679 err = PTR_ERR(dfid); 680 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 681 return ERR_PTR(err); 682 } 683 684 /* clone a fid to use for creation */ 685 ofid = clone_fid(dfid); 686 if (IS_ERR(ofid)) { 687 err = PTR_ERR(ofid); 688 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 689 return ERR_PTR(err); 690 } 691 692 err = p9_client_fcreate(ofid, name, perm, mode, extension); 693 if (err < 0) { 694 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 695 goto error; 696 } 697 698 if (!(perm & P9_DMLINK)) { 699 /* now walk from the parent so we can get unopened fid */ 700 fid = p9_client_walk(dfid, 1, &name, 1); 701 if (IS_ERR(fid)) { 702 err = PTR_ERR(fid); 703 p9_debug(P9_DEBUG_VFS, 704 "p9_client_walk failed %d\n", err); 705 fid = NULL; 706 goto error; 707 } 708 /* 709 * instantiate inode and assign the unopened fid to the dentry 710 */ 711 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 712 if (IS_ERR(inode)) { 713 err = PTR_ERR(inode); 714 p9_debug(P9_DEBUG_VFS, 715 "inode creation failed %d\n", err); 716 goto error; 717 } 718 v9fs_fid_add(dentry, fid); 719 d_instantiate(dentry, inode); 720 } 721 return ofid; 722 error: 723 if (ofid) 724 p9_client_clunk(ofid); 725 726 if (fid) 727 p9_client_clunk(fid); 728 729 return ERR_PTR(err); 730 } 731 732 /** 733 * v9fs_vfs_create - VFS hook to create a regular file 734 * 735 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 736 * for mknod(2). 737 * 738 * @dir: directory inode that is being created 739 * @dentry: dentry that is being deleted 740 * @mode: create permissions 741 * 742 */ 743 744 static int 745 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 746 bool excl) 747 { 748 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 749 u32 perm = unixmode2p9mode(v9ses, mode); 750 struct p9_fid *fid; 751 752 /* P9_OEXCL? */ 753 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 754 if (IS_ERR(fid)) 755 return PTR_ERR(fid); 756 757 v9fs_invalidate_inode_attr(dir); 758 p9_client_clunk(fid); 759 760 return 0; 761 } 762 763 /** 764 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 765 * @dir: inode that is being unlinked 766 * @dentry: dentry that is being unlinked 767 * @mode: mode for new directory 768 * 769 */ 770 771 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 772 { 773 int err; 774 u32 perm; 775 struct p9_fid *fid; 776 struct v9fs_session_info *v9ses; 777 778 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 779 err = 0; 780 v9ses = v9fs_inode2v9ses(dir); 781 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 782 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 783 if (IS_ERR(fid)) { 784 err = PTR_ERR(fid); 785 fid = NULL; 786 } else { 787 inc_nlink(dir); 788 v9fs_invalidate_inode_attr(dir); 789 } 790 791 if (fid) 792 p9_client_clunk(fid); 793 794 return err; 795 } 796 797 /** 798 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 799 * @dir: inode that is being walked from 800 * @dentry: dentry that is being walked to? 801 * @flags: lookup flags (unused) 802 * 803 */ 804 805 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 806 unsigned int flags) 807 { 808 struct dentry *res; 809 struct v9fs_session_info *v9ses; 810 struct p9_fid *dfid, *fid; 811 struct inode *inode; 812 const unsigned char *name; 813 814 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 815 dir, dentry, dentry, flags); 816 817 if (dentry->d_name.len > NAME_MAX) 818 return ERR_PTR(-ENAMETOOLONG); 819 820 v9ses = v9fs_inode2v9ses(dir); 821 /* We can walk d_parent because we hold the dir->i_mutex */ 822 dfid = v9fs_parent_fid(dentry); 823 if (IS_ERR(dfid)) 824 return ERR_CAST(dfid); 825 826 name = dentry->d_name.name; 827 fid = p9_client_walk(dfid, 1, &name, 1); 828 if (IS_ERR(fid)) { 829 if (fid == ERR_PTR(-ENOENT)) { 830 d_add(dentry, NULL); 831 return NULL; 832 } 833 return ERR_CAST(fid); 834 } 835 /* 836 * Make sure we don't use a wrong inode due to parallel 837 * unlink. For cached mode create calls request for new 838 * inode. But with cache disabled, lookup should do this. 839 */ 840 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 841 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 842 else 843 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 844 if (IS_ERR(inode)) { 845 p9_client_clunk(fid); 846 return ERR_CAST(inode); 847 } 848 /* 849 * If we had a rename on the server and a parallel lookup 850 * for the new name, then make sure we instantiate with 851 * the new name. ie look up for a/b, while on server somebody 852 * moved b under k and client parallely did a lookup for 853 * k/b. 854 */ 855 res = d_splice_alias(inode, dentry); 856 if (!res) 857 v9fs_fid_add(dentry, fid); 858 else if (!IS_ERR(res)) 859 v9fs_fid_add(res, fid); 860 else 861 p9_client_clunk(fid); 862 return res; 863 } 864 865 static int 866 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 867 struct file *file, unsigned flags, umode_t mode, 868 int *opened) 869 { 870 int err; 871 u32 perm; 872 struct v9fs_inode *v9inode; 873 struct v9fs_session_info *v9ses; 874 struct p9_fid *fid, *inode_fid; 875 struct dentry *res = NULL; 876 877 if (d_in_lookup(dentry)) { 878 res = v9fs_vfs_lookup(dir, dentry, 0); 879 if (IS_ERR(res)) 880 return PTR_ERR(res); 881 882 if (res) 883 dentry = res; 884 } 885 886 /* Only creates */ 887 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 888 return finish_no_open(file, res); 889 890 err = 0; 891 892 v9ses = v9fs_inode2v9ses(dir); 893 perm = unixmode2p9mode(v9ses, mode); 894 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 895 v9fs_uflags2omode(flags, 896 v9fs_proto_dotu(v9ses))); 897 if (IS_ERR(fid)) { 898 err = PTR_ERR(fid); 899 fid = NULL; 900 goto error; 901 } 902 903 v9fs_invalidate_inode_attr(dir); 904 v9inode = V9FS_I(d_inode(dentry)); 905 mutex_lock(&v9inode->v_mutex); 906 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 907 !v9inode->writeback_fid && 908 ((flags & O_ACCMODE) != O_RDONLY)) { 909 /* 910 * clone a fid and add it to writeback_fid 911 * we do it during open time instead of 912 * page dirty time via write_begin/page_mkwrite 913 * because we want write after unlink usecase 914 * to work. 915 */ 916 inode_fid = v9fs_writeback_fid(dentry); 917 if (IS_ERR(inode_fid)) { 918 err = PTR_ERR(inode_fid); 919 mutex_unlock(&v9inode->v_mutex); 920 goto error; 921 } 922 v9inode->writeback_fid = (void *) inode_fid; 923 } 924 mutex_unlock(&v9inode->v_mutex); 925 err = finish_open(file, dentry, generic_file_open, opened); 926 if (err) 927 goto error; 928 929 file->private_data = fid; 930 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 931 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 932 933 *opened |= FILE_CREATED; 934 out: 935 dput(res); 936 return err; 937 938 error: 939 if (fid) 940 p9_client_clunk(fid); 941 goto out; 942 } 943 944 /** 945 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 946 * @i: inode that is being unlinked 947 * @d: dentry that is being unlinked 948 * 949 */ 950 951 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 952 { 953 return v9fs_remove(i, d, 0); 954 } 955 956 /** 957 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 958 * @i: inode that is being unlinked 959 * @d: dentry that is being unlinked 960 * 961 */ 962 963 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 964 { 965 return v9fs_remove(i, d, AT_REMOVEDIR); 966 } 967 968 /** 969 * v9fs_vfs_rename - VFS hook to rename an inode 970 * @old_dir: old dir inode 971 * @old_dentry: old dentry 972 * @new_dir: new dir inode 973 * @new_dentry: new dentry 974 * 975 */ 976 977 int 978 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 979 struct inode *new_dir, struct dentry *new_dentry, 980 unsigned int flags) 981 { 982 int retval; 983 struct inode *old_inode; 984 struct inode *new_inode; 985 struct v9fs_session_info *v9ses; 986 struct p9_fid *oldfid; 987 struct p9_fid *olddirfid; 988 struct p9_fid *newdirfid; 989 struct p9_wstat wstat; 990 991 if (flags) 992 return -EINVAL; 993 994 p9_debug(P9_DEBUG_VFS, "\n"); 995 retval = 0; 996 old_inode = d_inode(old_dentry); 997 new_inode = d_inode(new_dentry); 998 v9ses = v9fs_inode2v9ses(old_inode); 999 oldfid = v9fs_fid_lookup(old_dentry); 1000 if (IS_ERR(oldfid)) 1001 return PTR_ERR(oldfid); 1002 1003 olddirfid = clone_fid(v9fs_parent_fid(old_dentry)); 1004 if (IS_ERR(olddirfid)) { 1005 retval = PTR_ERR(olddirfid); 1006 goto done; 1007 } 1008 1009 newdirfid = clone_fid(v9fs_parent_fid(new_dentry)); 1010 if (IS_ERR(newdirfid)) { 1011 retval = PTR_ERR(newdirfid); 1012 goto clunk_olddir; 1013 } 1014 1015 down_write(&v9ses->rename_sem); 1016 if (v9fs_proto_dotl(v9ses)) { 1017 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 1018 newdirfid, new_dentry->d_name.name); 1019 if (retval == -EOPNOTSUPP) 1020 retval = p9_client_rename(oldfid, newdirfid, 1021 new_dentry->d_name.name); 1022 if (retval != -EOPNOTSUPP) 1023 goto clunk_newdir; 1024 } 1025 if (old_dentry->d_parent != new_dentry->d_parent) { 1026 /* 1027 * 9P .u can only handle file rename in the same directory 1028 */ 1029 1030 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1031 retval = -EXDEV; 1032 goto clunk_newdir; 1033 } 1034 v9fs_blank_wstat(&wstat); 1035 wstat.muid = v9ses->uname; 1036 wstat.name = new_dentry->d_name.name; 1037 retval = p9_client_wstat(oldfid, &wstat); 1038 1039 clunk_newdir: 1040 if (!retval) { 1041 if (new_inode) { 1042 if (S_ISDIR(new_inode->i_mode)) 1043 clear_nlink(new_inode); 1044 else 1045 v9fs_dec_count(new_inode); 1046 } 1047 if (S_ISDIR(old_inode->i_mode)) { 1048 if (!new_inode) 1049 inc_nlink(new_dir); 1050 v9fs_dec_count(old_dir); 1051 } 1052 v9fs_invalidate_inode_attr(old_inode); 1053 v9fs_invalidate_inode_attr(old_dir); 1054 v9fs_invalidate_inode_attr(new_dir); 1055 1056 /* successful rename */ 1057 d_move(old_dentry, new_dentry); 1058 } 1059 up_write(&v9ses->rename_sem); 1060 p9_client_clunk(newdirfid); 1061 1062 clunk_olddir: 1063 p9_client_clunk(olddirfid); 1064 1065 done: 1066 return retval; 1067 } 1068 1069 /** 1070 * v9fs_vfs_getattr - retrieve file metadata 1071 * @path: Object to query 1072 * @stat: metadata structure to populate 1073 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1074 * @flags: AT_STATX_xxx setting 1075 * 1076 */ 1077 1078 static int 1079 v9fs_vfs_getattr(const struct path *path, struct kstat *stat, 1080 u32 request_mask, unsigned int flags) 1081 { 1082 struct dentry *dentry = path->dentry; 1083 struct v9fs_session_info *v9ses; 1084 struct p9_fid *fid; 1085 struct p9_wstat *st; 1086 1087 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1088 v9ses = v9fs_dentry2v9ses(dentry); 1089 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1090 generic_fillattr(d_inode(dentry), stat); 1091 return 0; 1092 } 1093 fid = v9fs_fid_lookup(dentry); 1094 if (IS_ERR(fid)) 1095 return PTR_ERR(fid); 1096 1097 st = p9_client_stat(fid); 1098 if (IS_ERR(st)) 1099 return PTR_ERR(st); 1100 1101 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb); 1102 generic_fillattr(d_inode(dentry), stat); 1103 1104 p9stat_free(st); 1105 kfree(st); 1106 return 0; 1107 } 1108 1109 /** 1110 * v9fs_vfs_setattr - set file metadata 1111 * @dentry: file whose metadata to set 1112 * @iattr: metadata assignment structure 1113 * 1114 */ 1115 1116 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1117 { 1118 int retval; 1119 struct v9fs_session_info *v9ses; 1120 struct p9_fid *fid; 1121 struct p9_wstat wstat; 1122 1123 p9_debug(P9_DEBUG_VFS, "\n"); 1124 retval = setattr_prepare(dentry, iattr); 1125 if (retval) 1126 return retval; 1127 1128 retval = -EPERM; 1129 v9ses = v9fs_dentry2v9ses(dentry); 1130 fid = v9fs_fid_lookup(dentry); 1131 if(IS_ERR(fid)) 1132 return PTR_ERR(fid); 1133 1134 v9fs_blank_wstat(&wstat); 1135 if (iattr->ia_valid & ATTR_MODE) 1136 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1137 1138 if (iattr->ia_valid & ATTR_MTIME) 1139 wstat.mtime = iattr->ia_mtime.tv_sec; 1140 1141 if (iattr->ia_valid & ATTR_ATIME) 1142 wstat.atime = iattr->ia_atime.tv_sec; 1143 1144 if (iattr->ia_valid & ATTR_SIZE) 1145 wstat.length = iattr->ia_size; 1146 1147 if (v9fs_proto_dotu(v9ses)) { 1148 if (iattr->ia_valid & ATTR_UID) 1149 wstat.n_uid = iattr->ia_uid; 1150 1151 if (iattr->ia_valid & ATTR_GID) 1152 wstat.n_gid = iattr->ia_gid; 1153 } 1154 1155 /* Write all dirty data */ 1156 if (d_is_reg(dentry)) 1157 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1158 1159 retval = p9_client_wstat(fid, &wstat); 1160 if (retval < 0) 1161 return retval; 1162 1163 if ((iattr->ia_valid & ATTR_SIZE) && 1164 iattr->ia_size != i_size_read(d_inode(dentry))) 1165 truncate_setsize(d_inode(dentry), iattr->ia_size); 1166 1167 v9fs_invalidate_inode_attr(d_inode(dentry)); 1168 1169 setattr_copy(d_inode(dentry), iattr); 1170 mark_inode_dirty(d_inode(dentry)); 1171 return 0; 1172 } 1173 1174 /** 1175 * v9fs_stat2inode - populate an inode structure with mistat info 1176 * @stat: Plan 9 metadata (mistat) structure 1177 * @inode: inode to populate 1178 * @sb: superblock of filesystem 1179 * 1180 */ 1181 1182 void 1183 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1184 struct super_block *sb) 1185 { 1186 umode_t mode; 1187 char ext[32]; 1188 char tag_name[14]; 1189 unsigned int i_nlink; 1190 struct v9fs_session_info *v9ses = sb->s_fs_info; 1191 struct v9fs_inode *v9inode = V9FS_I(inode); 1192 1193 set_nlink(inode, 1); 1194 1195 inode->i_atime.tv_sec = stat->atime; 1196 inode->i_mtime.tv_sec = stat->mtime; 1197 inode->i_ctime.tv_sec = stat->mtime; 1198 1199 inode->i_uid = v9ses->dfltuid; 1200 inode->i_gid = v9ses->dfltgid; 1201 1202 if (v9fs_proto_dotu(v9ses)) { 1203 inode->i_uid = stat->n_uid; 1204 inode->i_gid = stat->n_gid; 1205 } 1206 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1207 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1208 /* 1209 * Hadlink support got added later to 1210 * to the .u extension. So there can be 1211 * server out there that doesn't support 1212 * this even with .u extension. So check 1213 * for non NULL stat->extension 1214 */ 1215 strlcpy(ext, stat->extension, sizeof(ext)); 1216 /* HARDLINKCOUNT %u */ 1217 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1218 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1219 set_nlink(inode, i_nlink); 1220 } 1221 } 1222 mode = p9mode2perm(v9ses, stat); 1223 mode |= inode->i_mode & ~S_IALLUGO; 1224 inode->i_mode = mode; 1225 i_size_write(inode, stat->length); 1226 1227 /* not real number of blocks, but 512 byte ones ... */ 1228 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1229 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1230 } 1231 1232 /** 1233 * v9fs_qid2ino - convert qid into inode number 1234 * @qid: qid to hash 1235 * 1236 * BUG: potential for inode number collisions? 1237 */ 1238 1239 ino_t v9fs_qid2ino(struct p9_qid *qid) 1240 { 1241 u64 path = qid->path + 2; 1242 ino_t i = 0; 1243 1244 if (sizeof(ino_t) == sizeof(path)) 1245 memcpy(&i, &path, sizeof(ino_t)); 1246 else 1247 i = (ino_t) (path ^ (path >> 32)); 1248 1249 return i; 1250 } 1251 1252 /** 1253 * v9fs_vfs_get_link - follow a symlink path 1254 * @dentry: dentry for symlink 1255 * @inode: inode for symlink 1256 * @done: delayed call for when we are done with the return value 1257 */ 1258 1259 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1260 struct inode *inode, 1261 struct delayed_call *done) 1262 { 1263 struct v9fs_session_info *v9ses; 1264 struct p9_fid *fid; 1265 struct p9_wstat *st; 1266 char *res; 1267 1268 if (!dentry) 1269 return ERR_PTR(-ECHILD); 1270 1271 v9ses = v9fs_dentry2v9ses(dentry); 1272 fid = v9fs_fid_lookup(dentry); 1273 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1274 1275 if (IS_ERR(fid)) 1276 return ERR_CAST(fid); 1277 1278 if (!v9fs_proto_dotu(v9ses)) 1279 return ERR_PTR(-EBADF); 1280 1281 st = p9_client_stat(fid); 1282 if (IS_ERR(st)) 1283 return ERR_CAST(st); 1284 1285 if (!(st->mode & P9_DMSYMLINK)) { 1286 p9stat_free(st); 1287 kfree(st); 1288 return ERR_PTR(-EINVAL); 1289 } 1290 res = st->extension; 1291 st->extension = NULL; 1292 if (strlen(res) >= PATH_MAX) 1293 res[PATH_MAX - 1] = '\0'; 1294 1295 p9stat_free(st); 1296 kfree(st); 1297 set_delayed_call(done, kfree_link, res); 1298 return res; 1299 } 1300 1301 /** 1302 * v9fs_vfs_mkspecial - create a special file 1303 * @dir: inode to create special file in 1304 * @dentry: dentry to create 1305 * @perm: mode to create special file 1306 * @extension: 9p2000.u format extension string representing special file 1307 * 1308 */ 1309 1310 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1311 u32 perm, const char *extension) 1312 { 1313 struct p9_fid *fid; 1314 struct v9fs_session_info *v9ses; 1315 1316 v9ses = v9fs_inode2v9ses(dir); 1317 if (!v9fs_proto_dotu(v9ses)) { 1318 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1319 return -EPERM; 1320 } 1321 1322 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1323 P9_OREAD); 1324 if (IS_ERR(fid)) 1325 return PTR_ERR(fid); 1326 1327 v9fs_invalidate_inode_attr(dir); 1328 p9_client_clunk(fid); 1329 return 0; 1330 } 1331 1332 /** 1333 * v9fs_vfs_symlink - helper function to create symlinks 1334 * @dir: directory inode containing symlink 1335 * @dentry: dentry for symlink 1336 * @symname: symlink data 1337 * 1338 * See Also: 9P2000.u RFC for more information 1339 * 1340 */ 1341 1342 static int 1343 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1344 { 1345 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1346 dir->i_ino, dentry, symname); 1347 1348 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1349 } 1350 1351 #define U32_MAX_DIGITS 10 1352 1353 /** 1354 * v9fs_vfs_link - create a hardlink 1355 * @old_dentry: dentry for file to link to 1356 * @dir: inode destination for new link 1357 * @dentry: dentry for link 1358 * 1359 */ 1360 1361 static int 1362 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1363 struct dentry *dentry) 1364 { 1365 int retval; 1366 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1367 struct p9_fid *oldfid; 1368 1369 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1370 dir->i_ino, dentry, old_dentry); 1371 1372 oldfid = v9fs_fid_clone(old_dentry); 1373 if (IS_ERR(oldfid)) 1374 return PTR_ERR(oldfid); 1375 1376 sprintf(name, "%d\n", oldfid->fid); 1377 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1378 if (!retval) { 1379 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1380 v9fs_invalidate_inode_attr(dir); 1381 } 1382 p9_client_clunk(oldfid); 1383 return retval; 1384 } 1385 1386 /** 1387 * v9fs_vfs_mknod - create a special file 1388 * @dir: inode destination for new link 1389 * @dentry: dentry for file 1390 * @mode: mode for creation 1391 * @rdev: device associated with special file 1392 * 1393 */ 1394 1395 static int 1396 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1397 { 1398 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1399 int retval; 1400 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1401 u32 perm; 1402 1403 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1404 dir->i_ino, dentry, mode, 1405 MAJOR(rdev), MINOR(rdev)); 1406 1407 /* build extension */ 1408 if (S_ISBLK(mode)) 1409 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1410 else if (S_ISCHR(mode)) 1411 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1412 else 1413 *name = 0; 1414 1415 perm = unixmode2p9mode(v9ses, mode); 1416 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1417 1418 return retval; 1419 } 1420 1421 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1422 { 1423 int umode; 1424 dev_t rdev; 1425 loff_t i_size; 1426 struct p9_wstat *st; 1427 struct v9fs_session_info *v9ses; 1428 1429 v9ses = v9fs_inode2v9ses(inode); 1430 st = p9_client_stat(fid); 1431 if (IS_ERR(st)) 1432 return PTR_ERR(st); 1433 /* 1434 * Don't update inode if the file type is different 1435 */ 1436 umode = p9mode2unixmode(v9ses, st, &rdev); 1437 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1438 goto out; 1439 1440 spin_lock(&inode->i_lock); 1441 /* 1442 * We don't want to refresh inode->i_size, 1443 * because we may have cached data 1444 */ 1445 i_size = inode->i_size; 1446 v9fs_stat2inode(st, inode, inode->i_sb); 1447 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 1448 inode->i_size = i_size; 1449 spin_unlock(&inode->i_lock); 1450 out: 1451 p9stat_free(st); 1452 kfree(st); 1453 return 0; 1454 } 1455 1456 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1457 .create = v9fs_vfs_create, 1458 .lookup = v9fs_vfs_lookup, 1459 .atomic_open = v9fs_vfs_atomic_open, 1460 .symlink = v9fs_vfs_symlink, 1461 .link = v9fs_vfs_link, 1462 .unlink = v9fs_vfs_unlink, 1463 .mkdir = v9fs_vfs_mkdir, 1464 .rmdir = v9fs_vfs_rmdir, 1465 .mknod = v9fs_vfs_mknod, 1466 .rename = v9fs_vfs_rename, 1467 .getattr = v9fs_vfs_getattr, 1468 .setattr = v9fs_vfs_setattr, 1469 }; 1470 1471 static const struct inode_operations v9fs_dir_inode_operations = { 1472 .create = v9fs_vfs_create, 1473 .lookup = v9fs_vfs_lookup, 1474 .atomic_open = v9fs_vfs_atomic_open, 1475 .unlink = v9fs_vfs_unlink, 1476 .mkdir = v9fs_vfs_mkdir, 1477 .rmdir = v9fs_vfs_rmdir, 1478 .mknod = v9fs_vfs_mknod, 1479 .rename = v9fs_vfs_rename, 1480 .getattr = v9fs_vfs_getattr, 1481 .setattr = v9fs_vfs_setattr, 1482 }; 1483 1484 static const struct inode_operations v9fs_file_inode_operations = { 1485 .getattr = v9fs_vfs_getattr, 1486 .setattr = v9fs_vfs_setattr, 1487 }; 1488 1489 static const struct inode_operations v9fs_symlink_inode_operations = { 1490 .get_link = v9fs_vfs_get_link, 1491 .getattr = v9fs_vfs_getattr, 1492 .setattr = v9fs_vfs_setattr, 1493 }; 1494 1495