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_free_inode - destroy an inode 257 * 258 */ 259 260 void v9fs_free_inode(struct inode *inode) 261 { 262 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 263 } 264 265 int v9fs_init_inode(struct v9fs_session_info *v9ses, 266 struct inode *inode, umode_t mode, dev_t rdev) 267 { 268 int err = 0; 269 270 inode_init_owner(inode, NULL, mode); 271 inode->i_blocks = 0; 272 inode->i_rdev = rdev; 273 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 274 inode->i_mapping->a_ops = &v9fs_addr_operations; 275 276 switch (mode & S_IFMT) { 277 case S_IFIFO: 278 case S_IFBLK: 279 case S_IFCHR: 280 case S_IFSOCK: 281 if (v9fs_proto_dotl(v9ses)) { 282 inode->i_op = &v9fs_file_inode_operations_dotl; 283 } else if (v9fs_proto_dotu(v9ses)) { 284 inode->i_op = &v9fs_file_inode_operations; 285 } else { 286 p9_debug(P9_DEBUG_ERROR, 287 "special files without extended mode\n"); 288 err = -EINVAL; 289 goto error; 290 } 291 init_special_inode(inode, inode->i_mode, inode->i_rdev); 292 break; 293 case S_IFREG: 294 if (v9fs_proto_dotl(v9ses)) { 295 inode->i_op = &v9fs_file_inode_operations_dotl; 296 if (v9ses->cache == CACHE_LOOSE || 297 v9ses->cache == CACHE_FSCACHE) 298 inode->i_fop = 299 &v9fs_cached_file_operations_dotl; 300 else if (v9ses->cache == CACHE_MMAP) 301 inode->i_fop = &v9fs_mmap_file_operations_dotl; 302 else 303 inode->i_fop = &v9fs_file_operations_dotl; 304 } else { 305 inode->i_op = &v9fs_file_inode_operations; 306 if (v9ses->cache == CACHE_LOOSE || 307 v9ses->cache == CACHE_FSCACHE) 308 inode->i_fop = 309 &v9fs_cached_file_operations; 310 else if (v9ses->cache == CACHE_MMAP) 311 inode->i_fop = &v9fs_mmap_file_operations; 312 else 313 inode->i_fop = &v9fs_file_operations; 314 } 315 316 break; 317 case S_IFLNK: 318 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 319 p9_debug(P9_DEBUG_ERROR, 320 "extended modes used with legacy protocol\n"); 321 err = -EINVAL; 322 goto error; 323 } 324 325 if (v9fs_proto_dotl(v9ses)) 326 inode->i_op = &v9fs_symlink_inode_operations_dotl; 327 else 328 inode->i_op = &v9fs_symlink_inode_operations; 329 330 break; 331 case S_IFDIR: 332 inc_nlink(inode); 333 if (v9fs_proto_dotl(v9ses)) 334 inode->i_op = &v9fs_dir_inode_operations_dotl; 335 else if (v9fs_proto_dotu(v9ses)) 336 inode->i_op = &v9fs_dir_inode_operations_dotu; 337 else 338 inode->i_op = &v9fs_dir_inode_operations; 339 340 if (v9fs_proto_dotl(v9ses)) 341 inode->i_fop = &v9fs_dir_operations_dotl; 342 else 343 inode->i_fop = &v9fs_dir_operations; 344 345 break; 346 default: 347 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 348 mode, mode & S_IFMT); 349 err = -EINVAL; 350 goto error; 351 } 352 error: 353 return err; 354 355 } 356 357 /** 358 * v9fs_get_inode - helper function to setup an inode 359 * @sb: superblock 360 * @mode: mode to setup inode with 361 * 362 */ 363 364 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 365 { 366 int err; 367 struct inode *inode; 368 struct v9fs_session_info *v9ses = sb->s_fs_info; 369 370 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 371 372 inode = new_inode(sb); 373 if (!inode) { 374 pr_warn("%s (%d): Problem allocating inode\n", 375 __func__, task_pid_nr(current)); 376 return ERR_PTR(-ENOMEM); 377 } 378 err = v9fs_init_inode(v9ses, inode, mode, rdev); 379 if (err) { 380 iput(inode); 381 return ERR_PTR(err); 382 } 383 return inode; 384 } 385 386 /* 387 static struct v9fs_fid* 388 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 389 { 390 int err; 391 int nfid; 392 struct v9fs_fid *ret; 393 struct v9fs_fcall *fcall; 394 395 nfid = v9fs_get_idpool(&v9ses->fidpool); 396 if (nfid < 0) { 397 eprintk(KERN_WARNING, "no free fids available\n"); 398 return ERR_PTR(-ENOSPC); 399 } 400 401 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 402 &fcall); 403 404 if (err < 0) { 405 if (fcall && fcall->id == RWALK) 406 goto clunk_fid; 407 408 PRINT_FCALL_ERROR("walk error", fcall); 409 v9fs_put_idpool(nfid, &v9ses->fidpool); 410 goto error; 411 } 412 413 kfree(fcall); 414 fcall = NULL; 415 ret = v9fs_fid_create(v9ses, nfid); 416 if (!ret) { 417 err = -ENOMEM; 418 goto clunk_fid; 419 } 420 421 err = v9fs_fid_insert(ret, dentry); 422 if (err < 0) { 423 v9fs_fid_destroy(ret); 424 goto clunk_fid; 425 } 426 427 return ret; 428 429 clunk_fid: 430 v9fs_t_clunk(v9ses, nfid); 431 432 error: 433 kfree(fcall); 434 return ERR_PTR(err); 435 } 436 */ 437 438 439 /** 440 * v9fs_clear_inode - release an inode 441 * @inode: inode to release 442 * 443 */ 444 void v9fs_evict_inode(struct inode *inode) 445 { 446 struct v9fs_inode *v9inode = V9FS_I(inode); 447 448 truncate_inode_pages_final(&inode->i_data); 449 clear_inode(inode); 450 filemap_fdatawrite(&inode->i_data); 451 452 v9fs_cache_inode_put_cookie(inode); 453 /* clunk the fid stashed in writeback_fid */ 454 if (v9inode->writeback_fid) { 455 p9_client_clunk(v9inode->writeback_fid); 456 v9inode->writeback_fid = NULL; 457 } 458 } 459 460 static int v9fs_test_inode(struct inode *inode, void *data) 461 { 462 int umode; 463 dev_t rdev; 464 struct v9fs_inode *v9inode = V9FS_I(inode); 465 struct p9_wstat *st = (struct p9_wstat *)data; 466 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 467 468 umode = p9mode2unixmode(v9ses, st, &rdev); 469 /* don't match inode of different type */ 470 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 471 return 0; 472 473 /* compare qid details */ 474 if (memcmp(&v9inode->qid.version, 475 &st->qid.version, sizeof(v9inode->qid.version))) 476 return 0; 477 478 if (v9inode->qid.type != st->qid.type) 479 return 0; 480 481 if (v9inode->qid.path != st->qid.path) 482 return 0; 483 return 1; 484 } 485 486 static int v9fs_test_new_inode(struct inode *inode, void *data) 487 { 488 return 0; 489 } 490 491 static int v9fs_set_inode(struct inode *inode, void *data) 492 { 493 struct v9fs_inode *v9inode = V9FS_I(inode); 494 struct p9_wstat *st = (struct p9_wstat *)data; 495 496 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 497 return 0; 498 } 499 500 static struct inode *v9fs_qid_iget(struct super_block *sb, 501 struct p9_qid *qid, 502 struct p9_wstat *st, 503 int new) 504 { 505 dev_t rdev; 506 int retval; 507 umode_t umode; 508 unsigned long i_ino; 509 struct inode *inode; 510 struct v9fs_session_info *v9ses = sb->s_fs_info; 511 int (*test)(struct inode *, void *); 512 513 if (new) 514 test = v9fs_test_new_inode; 515 else 516 test = v9fs_test_inode; 517 518 i_ino = v9fs_qid2ino(qid); 519 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 520 if (!inode) 521 return ERR_PTR(-ENOMEM); 522 if (!(inode->i_state & I_NEW)) 523 return inode; 524 /* 525 * initialize the inode with the stat info 526 * FIXME!! we may need support for stale inodes 527 * later. 528 */ 529 inode->i_ino = i_ino; 530 umode = p9mode2unixmode(v9ses, st, &rdev); 531 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 532 if (retval) 533 goto error; 534 535 v9fs_stat2inode(st, inode, sb, 0); 536 v9fs_cache_inode_get_cookie(inode); 537 unlock_new_inode(inode); 538 return inode; 539 error: 540 iget_failed(inode); 541 return ERR_PTR(retval); 542 543 } 544 545 struct inode * 546 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 547 struct super_block *sb, int new) 548 { 549 struct p9_wstat *st; 550 struct inode *inode = NULL; 551 552 st = p9_client_stat(fid); 553 if (IS_ERR(st)) 554 return ERR_CAST(st); 555 556 inode = v9fs_qid_iget(sb, &st->qid, st, new); 557 p9stat_free(st); 558 kfree(st); 559 return inode; 560 } 561 562 /** 563 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 564 * plan 9 AT flag. 565 * @flags: flags to convert 566 */ 567 static int v9fs_at_to_dotl_flags(int flags) 568 { 569 int rflags = 0; 570 if (flags & AT_REMOVEDIR) 571 rflags |= P9_DOTL_AT_REMOVEDIR; 572 return rflags; 573 } 574 575 /** 576 * v9fs_dec_count - helper functon to drop i_nlink. 577 * 578 * If a directory had nlink <= 2 (including . and ..), then we should not drop 579 * the link count, which indicates the underlying exported fs doesn't maintain 580 * nlink accurately. e.g. 581 * - overlayfs sets nlink to 1 for merged dir 582 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 583 * than EXT4_LINK_MAX (65000) links. 584 * 585 * @inode: inode whose nlink is being dropped 586 */ 587 static void v9fs_dec_count(struct inode *inode) 588 { 589 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 590 drop_nlink(inode); 591 } 592 593 /** 594 * v9fs_remove - helper function to remove files and directories 595 * @dir: directory inode that is being deleted 596 * @dentry: dentry that is being deleted 597 * @flags: removing a directory 598 * 599 */ 600 601 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 602 { 603 struct inode *inode; 604 int retval = -EOPNOTSUPP; 605 struct p9_fid *v9fid, *dfid; 606 struct v9fs_session_info *v9ses; 607 608 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 609 dir, dentry, flags); 610 611 v9ses = v9fs_inode2v9ses(dir); 612 inode = d_inode(dentry); 613 dfid = v9fs_parent_fid(dentry); 614 if (IS_ERR(dfid)) { 615 retval = PTR_ERR(dfid); 616 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 617 return retval; 618 } 619 if (v9fs_proto_dotl(v9ses)) 620 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 621 v9fs_at_to_dotl_flags(flags)); 622 if (retval == -EOPNOTSUPP) { 623 /* Try the one based on path */ 624 v9fid = v9fs_fid_clone(dentry); 625 if (IS_ERR(v9fid)) 626 return PTR_ERR(v9fid); 627 retval = p9_client_remove(v9fid); 628 } 629 if (!retval) { 630 /* 631 * directories on unlink should have zero 632 * link count 633 */ 634 if (flags & AT_REMOVEDIR) { 635 clear_nlink(inode); 636 v9fs_dec_count(dir); 637 } else 638 v9fs_dec_count(inode); 639 640 v9fs_invalidate_inode_attr(inode); 641 v9fs_invalidate_inode_attr(dir); 642 } 643 return retval; 644 } 645 646 /** 647 * v9fs_create - Create a file 648 * @v9ses: session information 649 * @dir: directory that dentry is being created in 650 * @dentry: dentry that is being created 651 * @extension: 9p2000.u extension string to support devices, etc. 652 * @perm: create permissions 653 * @mode: open mode 654 * 655 */ 656 static struct p9_fid * 657 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 658 struct dentry *dentry, char *extension, u32 perm, u8 mode) 659 { 660 int err; 661 const unsigned char *name; 662 struct p9_fid *dfid, *ofid, *fid; 663 struct inode *inode; 664 665 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 666 667 err = 0; 668 ofid = NULL; 669 fid = NULL; 670 name = dentry->d_name.name; 671 dfid = v9fs_parent_fid(dentry); 672 if (IS_ERR(dfid)) { 673 err = PTR_ERR(dfid); 674 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 675 return ERR_PTR(err); 676 } 677 678 /* clone a fid to use for creation */ 679 ofid = clone_fid(dfid); 680 if (IS_ERR(ofid)) { 681 err = PTR_ERR(ofid); 682 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 683 return ERR_PTR(err); 684 } 685 686 err = p9_client_fcreate(ofid, name, perm, mode, extension); 687 if (err < 0) { 688 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 689 goto error; 690 } 691 692 if (!(perm & P9_DMLINK)) { 693 /* now walk from the parent so we can get unopened fid */ 694 fid = p9_client_walk(dfid, 1, &name, 1); 695 if (IS_ERR(fid)) { 696 err = PTR_ERR(fid); 697 p9_debug(P9_DEBUG_VFS, 698 "p9_client_walk failed %d\n", err); 699 fid = NULL; 700 goto error; 701 } 702 /* 703 * instantiate inode and assign the unopened fid to the dentry 704 */ 705 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 706 if (IS_ERR(inode)) { 707 err = PTR_ERR(inode); 708 p9_debug(P9_DEBUG_VFS, 709 "inode creation failed %d\n", err); 710 goto error; 711 } 712 v9fs_fid_add(dentry, fid); 713 d_instantiate(dentry, inode); 714 } 715 return ofid; 716 error: 717 if (ofid) 718 p9_client_clunk(ofid); 719 720 if (fid) 721 p9_client_clunk(fid); 722 723 return ERR_PTR(err); 724 } 725 726 /** 727 * v9fs_vfs_create - VFS hook to create a regular file 728 * 729 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 730 * for mknod(2). 731 * 732 * @dir: directory inode that is being created 733 * @dentry: dentry that is being deleted 734 * @mode: create permissions 735 * 736 */ 737 738 static int 739 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 740 bool excl) 741 { 742 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 743 u32 perm = unixmode2p9mode(v9ses, mode); 744 struct p9_fid *fid; 745 746 /* P9_OEXCL? */ 747 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 748 if (IS_ERR(fid)) 749 return PTR_ERR(fid); 750 751 v9fs_invalidate_inode_attr(dir); 752 p9_client_clunk(fid); 753 754 return 0; 755 } 756 757 /** 758 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 759 * @dir: inode that is being unlinked 760 * @dentry: dentry that is being unlinked 761 * @mode: mode for new directory 762 * 763 */ 764 765 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 766 { 767 int err; 768 u32 perm; 769 struct p9_fid *fid; 770 struct v9fs_session_info *v9ses; 771 772 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 773 err = 0; 774 v9ses = v9fs_inode2v9ses(dir); 775 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 776 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 777 if (IS_ERR(fid)) { 778 err = PTR_ERR(fid); 779 fid = NULL; 780 } else { 781 inc_nlink(dir); 782 v9fs_invalidate_inode_attr(dir); 783 } 784 785 if (fid) 786 p9_client_clunk(fid); 787 788 return err; 789 } 790 791 /** 792 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 793 * @dir: inode that is being walked from 794 * @dentry: dentry that is being walked to? 795 * @flags: lookup flags (unused) 796 * 797 */ 798 799 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 800 unsigned int flags) 801 { 802 struct dentry *res; 803 struct v9fs_session_info *v9ses; 804 struct p9_fid *dfid, *fid; 805 struct inode *inode; 806 const unsigned char *name; 807 808 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 809 dir, dentry, dentry, flags); 810 811 if (dentry->d_name.len > NAME_MAX) 812 return ERR_PTR(-ENAMETOOLONG); 813 814 v9ses = v9fs_inode2v9ses(dir); 815 /* We can walk d_parent because we hold the dir->i_mutex */ 816 dfid = v9fs_parent_fid(dentry); 817 if (IS_ERR(dfid)) 818 return ERR_CAST(dfid); 819 820 /* 821 * Make sure we don't use a wrong inode due to parallel 822 * unlink. For cached mode create calls request for new 823 * inode. But with cache disabled, lookup should do this. 824 */ 825 name = dentry->d_name.name; 826 fid = p9_client_walk(dfid, 1, &name, 1); 827 if (fid == ERR_PTR(-ENOENT)) 828 inode = NULL; 829 else if (IS_ERR(fid)) 830 inode = ERR_CAST(fid); 831 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 832 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 833 else 834 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 835 /* 836 * If we had a rename on the server and a parallel lookup 837 * for the new name, then make sure we instantiate with 838 * the new name. ie look up for a/b, while on server somebody 839 * moved b under k and client parallely did a lookup for 840 * k/b. 841 */ 842 res = d_splice_alias(inode, dentry); 843 if (!IS_ERR(fid)) { 844 if (!res) 845 v9fs_fid_add(dentry, fid); 846 else if (!IS_ERR(res)) 847 v9fs_fid_add(res, fid); 848 else 849 p9_client_clunk(fid); 850 } 851 return res; 852 } 853 854 static int 855 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 856 struct file *file, unsigned flags, umode_t mode) 857 { 858 int err; 859 u32 perm; 860 struct v9fs_inode *v9inode; 861 struct v9fs_session_info *v9ses; 862 struct p9_fid *fid, *inode_fid; 863 struct dentry *res = NULL; 864 865 if (d_in_lookup(dentry)) { 866 res = v9fs_vfs_lookup(dir, dentry, 0); 867 if (IS_ERR(res)) 868 return PTR_ERR(res); 869 870 if (res) 871 dentry = res; 872 } 873 874 /* Only creates */ 875 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 876 return finish_no_open(file, res); 877 878 err = 0; 879 880 v9ses = v9fs_inode2v9ses(dir); 881 perm = unixmode2p9mode(v9ses, mode); 882 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 883 v9fs_uflags2omode(flags, 884 v9fs_proto_dotu(v9ses))); 885 if (IS_ERR(fid)) { 886 err = PTR_ERR(fid); 887 fid = NULL; 888 goto error; 889 } 890 891 v9fs_invalidate_inode_attr(dir); 892 v9inode = V9FS_I(d_inode(dentry)); 893 mutex_lock(&v9inode->v_mutex); 894 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 895 !v9inode->writeback_fid && 896 ((flags & O_ACCMODE) != O_RDONLY)) { 897 /* 898 * clone a fid and add it to writeback_fid 899 * we do it during open time instead of 900 * page dirty time via write_begin/page_mkwrite 901 * because we want write after unlink usecase 902 * to work. 903 */ 904 inode_fid = v9fs_writeback_fid(dentry); 905 if (IS_ERR(inode_fid)) { 906 err = PTR_ERR(inode_fid); 907 mutex_unlock(&v9inode->v_mutex); 908 goto error; 909 } 910 v9inode->writeback_fid = (void *) inode_fid; 911 } 912 mutex_unlock(&v9inode->v_mutex); 913 err = finish_open(file, dentry, generic_file_open); 914 if (err) 915 goto error; 916 917 file->private_data = fid; 918 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 919 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 920 921 file->f_mode |= FMODE_CREATED; 922 out: 923 dput(res); 924 return err; 925 926 error: 927 if (fid) 928 p9_client_clunk(fid); 929 goto out; 930 } 931 932 /** 933 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 934 * @i: inode that is being unlinked 935 * @d: dentry that is being unlinked 936 * 937 */ 938 939 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 940 { 941 return v9fs_remove(i, d, 0); 942 } 943 944 /** 945 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 946 * @i: inode that is being unlinked 947 * @d: dentry that is being unlinked 948 * 949 */ 950 951 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 952 { 953 return v9fs_remove(i, d, AT_REMOVEDIR); 954 } 955 956 /** 957 * v9fs_vfs_rename - VFS hook to rename an inode 958 * @old_dir: old dir inode 959 * @old_dentry: old dentry 960 * @new_dir: new dir inode 961 * @new_dentry: new dentry 962 * 963 */ 964 965 int 966 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 967 struct inode *new_dir, struct dentry *new_dentry, 968 unsigned int flags) 969 { 970 int retval; 971 struct inode *old_inode; 972 struct inode *new_inode; 973 struct v9fs_session_info *v9ses; 974 struct p9_fid *oldfid; 975 struct p9_fid *olddirfid; 976 struct p9_fid *newdirfid; 977 struct p9_wstat wstat; 978 979 if (flags) 980 return -EINVAL; 981 982 p9_debug(P9_DEBUG_VFS, "\n"); 983 retval = 0; 984 old_inode = d_inode(old_dentry); 985 new_inode = d_inode(new_dentry); 986 v9ses = v9fs_inode2v9ses(old_inode); 987 oldfid = v9fs_fid_lookup(old_dentry); 988 if (IS_ERR(oldfid)) 989 return PTR_ERR(oldfid); 990 991 olddirfid = clone_fid(v9fs_parent_fid(old_dentry)); 992 if (IS_ERR(olddirfid)) { 993 retval = PTR_ERR(olddirfid); 994 goto done; 995 } 996 997 newdirfid = clone_fid(v9fs_parent_fid(new_dentry)); 998 if (IS_ERR(newdirfid)) { 999 retval = PTR_ERR(newdirfid); 1000 goto clunk_olddir; 1001 } 1002 1003 down_write(&v9ses->rename_sem); 1004 if (v9fs_proto_dotl(v9ses)) { 1005 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 1006 newdirfid, new_dentry->d_name.name); 1007 if (retval == -EOPNOTSUPP) 1008 retval = p9_client_rename(oldfid, newdirfid, 1009 new_dentry->d_name.name); 1010 if (retval != -EOPNOTSUPP) 1011 goto clunk_newdir; 1012 } 1013 if (old_dentry->d_parent != new_dentry->d_parent) { 1014 /* 1015 * 9P .u can only handle file rename in the same directory 1016 */ 1017 1018 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1019 retval = -EXDEV; 1020 goto clunk_newdir; 1021 } 1022 v9fs_blank_wstat(&wstat); 1023 wstat.muid = v9ses->uname; 1024 wstat.name = new_dentry->d_name.name; 1025 retval = p9_client_wstat(oldfid, &wstat); 1026 1027 clunk_newdir: 1028 if (!retval) { 1029 if (new_inode) { 1030 if (S_ISDIR(new_inode->i_mode)) 1031 clear_nlink(new_inode); 1032 else 1033 v9fs_dec_count(new_inode); 1034 } 1035 if (S_ISDIR(old_inode->i_mode)) { 1036 if (!new_inode) 1037 inc_nlink(new_dir); 1038 v9fs_dec_count(old_dir); 1039 } 1040 v9fs_invalidate_inode_attr(old_inode); 1041 v9fs_invalidate_inode_attr(old_dir); 1042 v9fs_invalidate_inode_attr(new_dir); 1043 1044 /* successful rename */ 1045 d_move(old_dentry, new_dentry); 1046 } 1047 up_write(&v9ses->rename_sem); 1048 p9_client_clunk(newdirfid); 1049 1050 clunk_olddir: 1051 p9_client_clunk(olddirfid); 1052 1053 done: 1054 return retval; 1055 } 1056 1057 /** 1058 * v9fs_vfs_getattr - retrieve file metadata 1059 * @path: Object to query 1060 * @stat: metadata structure to populate 1061 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1062 * @flags: AT_STATX_xxx setting 1063 * 1064 */ 1065 1066 static int 1067 v9fs_vfs_getattr(const struct path *path, struct kstat *stat, 1068 u32 request_mask, unsigned int flags) 1069 { 1070 struct dentry *dentry = path->dentry; 1071 struct v9fs_session_info *v9ses; 1072 struct p9_fid *fid; 1073 struct p9_wstat *st; 1074 1075 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1076 v9ses = v9fs_dentry2v9ses(dentry); 1077 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1078 generic_fillattr(d_inode(dentry), stat); 1079 return 0; 1080 } 1081 fid = v9fs_fid_lookup(dentry); 1082 if (IS_ERR(fid)) 1083 return PTR_ERR(fid); 1084 1085 st = p9_client_stat(fid); 1086 if (IS_ERR(st)) 1087 return PTR_ERR(st); 1088 1089 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1090 generic_fillattr(d_inode(dentry), stat); 1091 1092 p9stat_free(st); 1093 kfree(st); 1094 return 0; 1095 } 1096 1097 /** 1098 * v9fs_vfs_setattr - set file metadata 1099 * @dentry: file whose metadata to set 1100 * @iattr: metadata assignment structure 1101 * 1102 */ 1103 1104 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1105 { 1106 int retval; 1107 struct v9fs_session_info *v9ses; 1108 struct p9_fid *fid; 1109 struct p9_wstat wstat; 1110 1111 p9_debug(P9_DEBUG_VFS, "\n"); 1112 retval = setattr_prepare(dentry, iattr); 1113 if (retval) 1114 return retval; 1115 1116 retval = -EPERM; 1117 v9ses = v9fs_dentry2v9ses(dentry); 1118 fid = v9fs_fid_lookup(dentry); 1119 if(IS_ERR(fid)) 1120 return PTR_ERR(fid); 1121 1122 v9fs_blank_wstat(&wstat); 1123 if (iattr->ia_valid & ATTR_MODE) 1124 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1125 1126 if (iattr->ia_valid & ATTR_MTIME) 1127 wstat.mtime = iattr->ia_mtime.tv_sec; 1128 1129 if (iattr->ia_valid & ATTR_ATIME) 1130 wstat.atime = iattr->ia_atime.tv_sec; 1131 1132 if (iattr->ia_valid & ATTR_SIZE) 1133 wstat.length = iattr->ia_size; 1134 1135 if (v9fs_proto_dotu(v9ses)) { 1136 if (iattr->ia_valid & ATTR_UID) 1137 wstat.n_uid = iattr->ia_uid; 1138 1139 if (iattr->ia_valid & ATTR_GID) 1140 wstat.n_gid = iattr->ia_gid; 1141 } 1142 1143 /* Write all dirty data */ 1144 if (d_is_reg(dentry)) 1145 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1146 1147 retval = p9_client_wstat(fid, &wstat); 1148 if (retval < 0) 1149 return retval; 1150 1151 if ((iattr->ia_valid & ATTR_SIZE) && 1152 iattr->ia_size != i_size_read(d_inode(dentry))) 1153 truncate_setsize(d_inode(dentry), iattr->ia_size); 1154 1155 v9fs_invalidate_inode_attr(d_inode(dentry)); 1156 1157 setattr_copy(d_inode(dentry), iattr); 1158 mark_inode_dirty(d_inode(dentry)); 1159 return 0; 1160 } 1161 1162 /** 1163 * v9fs_stat2inode - populate an inode structure with mistat info 1164 * @stat: Plan 9 metadata (mistat) structure 1165 * @inode: inode to populate 1166 * @sb: superblock of filesystem 1167 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1168 * 1169 */ 1170 1171 void 1172 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1173 struct super_block *sb, unsigned int flags) 1174 { 1175 umode_t mode; 1176 char ext[32]; 1177 char tag_name[14]; 1178 unsigned int i_nlink; 1179 struct v9fs_session_info *v9ses = sb->s_fs_info; 1180 struct v9fs_inode *v9inode = V9FS_I(inode); 1181 1182 set_nlink(inode, 1); 1183 1184 inode->i_atime.tv_sec = stat->atime; 1185 inode->i_mtime.tv_sec = stat->mtime; 1186 inode->i_ctime.tv_sec = stat->mtime; 1187 1188 inode->i_uid = v9ses->dfltuid; 1189 inode->i_gid = v9ses->dfltgid; 1190 1191 if (v9fs_proto_dotu(v9ses)) { 1192 inode->i_uid = stat->n_uid; 1193 inode->i_gid = stat->n_gid; 1194 } 1195 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1196 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1197 /* 1198 * Hadlink support got added later to 1199 * to the .u extension. So there can be 1200 * server out there that doesn't support 1201 * this even with .u extension. So check 1202 * for non NULL stat->extension 1203 */ 1204 strlcpy(ext, stat->extension, sizeof(ext)); 1205 /* HARDLINKCOUNT %u */ 1206 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1207 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1208 set_nlink(inode, i_nlink); 1209 } 1210 } 1211 mode = p9mode2perm(v9ses, stat); 1212 mode |= inode->i_mode & ~S_IALLUGO; 1213 inode->i_mode = mode; 1214 1215 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1216 v9fs_i_size_write(inode, stat->length); 1217 /* not real number of blocks, but 512 byte ones ... */ 1218 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1219 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1220 } 1221 1222 /** 1223 * v9fs_qid2ino - convert qid into inode number 1224 * @qid: qid to hash 1225 * 1226 * BUG: potential for inode number collisions? 1227 */ 1228 1229 ino_t v9fs_qid2ino(struct p9_qid *qid) 1230 { 1231 u64 path = qid->path + 2; 1232 ino_t i = 0; 1233 1234 if (sizeof(ino_t) == sizeof(path)) 1235 memcpy(&i, &path, sizeof(ino_t)); 1236 else 1237 i = (ino_t) (path ^ (path >> 32)); 1238 1239 return i; 1240 } 1241 1242 /** 1243 * v9fs_vfs_get_link - follow a symlink path 1244 * @dentry: dentry for symlink 1245 * @inode: inode for symlink 1246 * @done: delayed call for when we are done with the return value 1247 */ 1248 1249 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1250 struct inode *inode, 1251 struct delayed_call *done) 1252 { 1253 struct v9fs_session_info *v9ses; 1254 struct p9_fid *fid; 1255 struct p9_wstat *st; 1256 char *res; 1257 1258 if (!dentry) 1259 return ERR_PTR(-ECHILD); 1260 1261 v9ses = v9fs_dentry2v9ses(dentry); 1262 fid = v9fs_fid_lookup(dentry); 1263 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1264 1265 if (IS_ERR(fid)) 1266 return ERR_CAST(fid); 1267 1268 if (!v9fs_proto_dotu(v9ses)) 1269 return ERR_PTR(-EBADF); 1270 1271 st = p9_client_stat(fid); 1272 if (IS_ERR(st)) 1273 return ERR_CAST(st); 1274 1275 if (!(st->mode & P9_DMSYMLINK)) { 1276 p9stat_free(st); 1277 kfree(st); 1278 return ERR_PTR(-EINVAL); 1279 } 1280 res = st->extension; 1281 st->extension = NULL; 1282 if (strlen(res) >= PATH_MAX) 1283 res[PATH_MAX - 1] = '\0'; 1284 1285 p9stat_free(st); 1286 kfree(st); 1287 set_delayed_call(done, kfree_link, res); 1288 return res; 1289 } 1290 1291 /** 1292 * v9fs_vfs_mkspecial - create a special file 1293 * @dir: inode to create special file in 1294 * @dentry: dentry to create 1295 * @perm: mode to create special file 1296 * @extension: 9p2000.u format extension string representing special file 1297 * 1298 */ 1299 1300 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1301 u32 perm, const char *extension) 1302 { 1303 struct p9_fid *fid; 1304 struct v9fs_session_info *v9ses; 1305 1306 v9ses = v9fs_inode2v9ses(dir); 1307 if (!v9fs_proto_dotu(v9ses)) { 1308 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1309 return -EPERM; 1310 } 1311 1312 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1313 P9_OREAD); 1314 if (IS_ERR(fid)) 1315 return PTR_ERR(fid); 1316 1317 v9fs_invalidate_inode_attr(dir); 1318 p9_client_clunk(fid); 1319 return 0; 1320 } 1321 1322 /** 1323 * v9fs_vfs_symlink - helper function to create symlinks 1324 * @dir: directory inode containing symlink 1325 * @dentry: dentry for symlink 1326 * @symname: symlink data 1327 * 1328 * See Also: 9P2000.u RFC for more information 1329 * 1330 */ 1331 1332 static int 1333 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1334 { 1335 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1336 dir->i_ino, dentry, symname); 1337 1338 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1339 } 1340 1341 #define U32_MAX_DIGITS 10 1342 1343 /** 1344 * v9fs_vfs_link - create a hardlink 1345 * @old_dentry: dentry for file to link to 1346 * @dir: inode destination for new link 1347 * @dentry: dentry for link 1348 * 1349 */ 1350 1351 static int 1352 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1353 struct dentry *dentry) 1354 { 1355 int retval; 1356 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1357 struct p9_fid *oldfid; 1358 1359 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1360 dir->i_ino, dentry, old_dentry); 1361 1362 oldfid = v9fs_fid_clone(old_dentry); 1363 if (IS_ERR(oldfid)) 1364 return PTR_ERR(oldfid); 1365 1366 sprintf(name, "%d\n", oldfid->fid); 1367 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1368 if (!retval) { 1369 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1370 v9fs_invalidate_inode_attr(dir); 1371 } 1372 p9_client_clunk(oldfid); 1373 return retval; 1374 } 1375 1376 /** 1377 * v9fs_vfs_mknod - create a special file 1378 * @dir: inode destination for new link 1379 * @dentry: dentry for file 1380 * @mode: mode for creation 1381 * @rdev: device associated with special file 1382 * 1383 */ 1384 1385 static int 1386 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1387 { 1388 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1389 int retval; 1390 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1391 u32 perm; 1392 1393 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1394 dir->i_ino, dentry, mode, 1395 MAJOR(rdev), MINOR(rdev)); 1396 1397 /* build extension */ 1398 if (S_ISBLK(mode)) 1399 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1400 else if (S_ISCHR(mode)) 1401 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1402 else 1403 *name = 0; 1404 1405 perm = unixmode2p9mode(v9ses, mode); 1406 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1407 1408 return retval; 1409 } 1410 1411 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1412 { 1413 int umode; 1414 dev_t rdev; 1415 struct p9_wstat *st; 1416 struct v9fs_session_info *v9ses; 1417 unsigned int flags; 1418 1419 v9ses = v9fs_inode2v9ses(inode); 1420 st = p9_client_stat(fid); 1421 if (IS_ERR(st)) 1422 return PTR_ERR(st); 1423 /* 1424 * Don't update inode if the file type is different 1425 */ 1426 umode = p9mode2unixmode(v9ses, st, &rdev); 1427 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1428 goto out; 1429 1430 /* 1431 * We don't want to refresh inode->i_size, 1432 * because we may have cached data 1433 */ 1434 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1435 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1436 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1437 out: 1438 p9stat_free(st); 1439 kfree(st); 1440 return 0; 1441 } 1442 1443 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1444 .create = v9fs_vfs_create, 1445 .lookup = v9fs_vfs_lookup, 1446 .atomic_open = v9fs_vfs_atomic_open, 1447 .symlink = v9fs_vfs_symlink, 1448 .link = v9fs_vfs_link, 1449 .unlink = v9fs_vfs_unlink, 1450 .mkdir = v9fs_vfs_mkdir, 1451 .rmdir = v9fs_vfs_rmdir, 1452 .mknod = v9fs_vfs_mknod, 1453 .rename = v9fs_vfs_rename, 1454 .getattr = v9fs_vfs_getattr, 1455 .setattr = v9fs_vfs_setattr, 1456 }; 1457 1458 static const struct inode_operations v9fs_dir_inode_operations = { 1459 .create = v9fs_vfs_create, 1460 .lookup = v9fs_vfs_lookup, 1461 .atomic_open = v9fs_vfs_atomic_open, 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_file_inode_operations = { 1472 .getattr = v9fs_vfs_getattr, 1473 .setattr = v9fs_vfs_setattr, 1474 }; 1475 1476 static const struct inode_operations v9fs_symlink_inode_operations = { 1477 .get_link = v9fs_vfs_get_link, 1478 .getattr = v9fs_vfs_getattr, 1479 .setattr = v9fs_vfs_setattr, 1480 }; 1481 1482