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/namei.h> 19 #include <linux/sched.h> 20 #include <linux/slab.h> 21 #include <linux/xattr.h> 22 #include <linux/posix_acl.h> 23 #include <net/9p/9p.h> 24 #include <net/9p/client.h> 25 26 #include "v9fs.h" 27 #include "v9fs_vfs.h" 28 #include "fid.h" 29 #include "cache.h" 30 #include "xattr.h" 31 #include "acl.h" 32 33 static const struct inode_operations v9fs_dir_inode_operations; 34 static const struct inode_operations v9fs_dir_inode_operations_dotu; 35 static const struct inode_operations v9fs_file_inode_operations; 36 static const struct inode_operations v9fs_symlink_inode_operations; 37 38 /** 39 * unixmode2p9mode - convert unix mode bits to plan 9 40 * @v9ses: v9fs session information 41 * @mode: mode to convert 42 * 43 */ 44 45 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 46 { 47 int res; 48 49 res = mode & 0777; 50 if (S_ISDIR(mode)) 51 res |= P9_DMDIR; 52 if (v9fs_proto_dotu(v9ses)) { 53 if (v9ses->nodev == 0) { 54 if (S_ISSOCK(mode)) 55 res |= P9_DMSOCKET; 56 if (S_ISFIFO(mode)) 57 res |= P9_DMNAMEDPIPE; 58 if (S_ISBLK(mode)) 59 res |= P9_DMDEVICE; 60 if (S_ISCHR(mode)) 61 res |= P9_DMDEVICE; 62 } 63 64 if ((mode & S_ISUID) == S_ISUID) 65 res |= P9_DMSETUID; 66 if ((mode & S_ISGID) == S_ISGID) 67 res |= P9_DMSETGID; 68 if ((mode & S_ISVTX) == S_ISVTX) 69 res |= P9_DMSETVTX; 70 } 71 return res; 72 } 73 74 /** 75 * p9mode2perm- convert plan9 mode bits to unix permission bits 76 * @v9ses: v9fs session information 77 * @stat: p9_wstat from which mode need to be derived 78 * 79 */ 80 static int p9mode2perm(struct v9fs_session_info *v9ses, 81 struct p9_wstat *stat) 82 { 83 int res; 84 int mode = stat->mode; 85 86 res = mode & S_IALLUGO; 87 if (v9fs_proto_dotu(v9ses)) { 88 if ((mode & P9_DMSETUID) == P9_DMSETUID) 89 res |= S_ISUID; 90 91 if ((mode & P9_DMSETGID) == P9_DMSETGID) 92 res |= S_ISGID; 93 94 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 95 res |= S_ISVTX; 96 } 97 return res; 98 } 99 100 /** 101 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 102 * @v9ses: v9fs session information 103 * @stat: p9_wstat from which mode need to be derived 104 * @rdev: major number, minor number in case of device files. 105 * 106 */ 107 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 108 struct p9_wstat *stat, dev_t *rdev) 109 { 110 int res, r; 111 u32 mode = stat->mode; 112 113 *rdev = 0; 114 res = p9mode2perm(v9ses, stat); 115 116 if ((mode & P9_DMDIR) == P9_DMDIR) 117 res |= S_IFDIR; 118 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 119 res |= S_IFLNK; 120 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 121 && (v9ses->nodev == 0)) 122 res |= S_IFSOCK; 123 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 124 && (v9ses->nodev == 0)) 125 res |= S_IFIFO; 126 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 127 && (v9ses->nodev == 0)) { 128 char type = 0; 129 int major = -1, minor = -1; 130 131 r = sscanf(stat->extension, "%c %i %i", &type, &major, &minor); 132 if (r != 3) { 133 p9_debug(P9_DEBUG_ERROR, 134 "invalid device string, umode will be bogus: %s\n", 135 stat->extension); 136 return res; 137 } 138 switch (type) { 139 case 'c': 140 res |= S_IFCHR; 141 break; 142 case 'b': 143 res |= S_IFBLK; 144 break; 145 default: 146 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 147 type, stat->extension); 148 } 149 *rdev = MKDEV(major, minor); 150 } else 151 res |= S_IFREG; 152 153 return res; 154 } 155 156 /** 157 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 158 * @uflags: flags to convert 159 * @extended: if .u extensions are active 160 */ 161 162 int v9fs_uflags2omode(int uflags, int extended) 163 { 164 int ret; 165 166 ret = 0; 167 switch (uflags&3) { 168 default: 169 case O_RDONLY: 170 ret = P9_OREAD; 171 break; 172 173 case O_WRONLY: 174 ret = P9_OWRITE; 175 break; 176 177 case O_RDWR: 178 ret = P9_ORDWR; 179 break; 180 } 181 182 if (extended) { 183 if (uflags & O_EXCL) 184 ret |= P9_OEXCL; 185 186 if (uflags & O_APPEND) 187 ret |= P9_OAPPEND; 188 } 189 190 return ret; 191 } 192 193 /** 194 * v9fs_blank_wstat - helper function to setup a 9P stat structure 195 * @wstat: structure to initialize 196 * 197 */ 198 199 void 200 v9fs_blank_wstat(struct p9_wstat *wstat) 201 { 202 wstat->type = ~0; 203 wstat->dev = ~0; 204 wstat->qid.type = ~0; 205 wstat->qid.version = ~0; 206 *((long long *)&wstat->qid.path) = ~0; 207 wstat->mode = ~0; 208 wstat->atime = ~0; 209 wstat->mtime = ~0; 210 wstat->length = ~0; 211 wstat->name = NULL; 212 wstat->uid = NULL; 213 wstat->gid = NULL; 214 wstat->muid = NULL; 215 wstat->n_uid = INVALID_UID; 216 wstat->n_gid = INVALID_GID; 217 wstat->n_muid = INVALID_UID; 218 wstat->extension = NULL; 219 } 220 221 /** 222 * v9fs_alloc_inode - helper function to allocate an inode 223 * @sb: The superblock to allocate the inode from 224 */ 225 struct inode *v9fs_alloc_inode(struct super_block *sb) 226 { 227 struct v9fs_inode *v9inode; 228 229 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL); 230 if (!v9inode) 231 return NULL; 232 v9inode->cache_validity = 0; 233 mutex_init(&v9inode->v_mutex); 234 return &v9inode->netfs.inode; 235 } 236 237 /** 238 * v9fs_free_inode - destroy an inode 239 * @inode: The inode to be freed 240 */ 241 242 void v9fs_free_inode(struct inode *inode) 243 { 244 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 245 } 246 247 /* 248 * Set parameters for the netfs library 249 */ 250 static void v9fs_set_netfs_context(struct inode *inode) 251 { 252 struct v9fs_inode *v9inode = V9FS_I(inode); 253 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops); 254 } 255 256 int v9fs_init_inode(struct v9fs_session_info *v9ses, 257 struct inode *inode, umode_t mode, dev_t rdev) 258 { 259 int err = 0; 260 261 inode_init_owner(&nop_mnt_idmap, inode, NULL, mode); 262 inode->i_blocks = 0; 263 inode->i_rdev = rdev; 264 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 265 inode->i_mapping->a_ops = &v9fs_addr_operations; 266 inode->i_private = NULL; 267 268 switch (mode & S_IFMT) { 269 case S_IFIFO: 270 case S_IFBLK: 271 case S_IFCHR: 272 case S_IFSOCK: 273 if (v9fs_proto_dotl(v9ses)) { 274 inode->i_op = &v9fs_file_inode_operations_dotl; 275 } else if (v9fs_proto_dotu(v9ses)) { 276 inode->i_op = &v9fs_file_inode_operations; 277 } else { 278 p9_debug(P9_DEBUG_ERROR, 279 "special files without extended mode\n"); 280 err = -EINVAL; 281 goto error; 282 } 283 init_special_inode(inode, inode->i_mode, inode->i_rdev); 284 break; 285 case S_IFREG: 286 if (v9fs_proto_dotl(v9ses)) { 287 inode->i_op = &v9fs_file_inode_operations_dotl; 288 inode->i_fop = &v9fs_file_operations_dotl; 289 } else { 290 inode->i_op = &v9fs_file_inode_operations; 291 inode->i_fop = &v9fs_file_operations; 292 } 293 294 break; 295 case S_IFLNK: 296 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 297 p9_debug(P9_DEBUG_ERROR, 298 "extended modes used with legacy protocol\n"); 299 err = -EINVAL; 300 goto error; 301 } 302 303 if (v9fs_proto_dotl(v9ses)) 304 inode->i_op = &v9fs_symlink_inode_operations_dotl; 305 else 306 inode->i_op = &v9fs_symlink_inode_operations; 307 308 break; 309 case S_IFDIR: 310 inc_nlink(inode); 311 if (v9fs_proto_dotl(v9ses)) 312 inode->i_op = &v9fs_dir_inode_operations_dotl; 313 else if (v9fs_proto_dotu(v9ses)) 314 inode->i_op = &v9fs_dir_inode_operations_dotu; 315 else 316 inode->i_op = &v9fs_dir_inode_operations; 317 318 if (v9fs_proto_dotl(v9ses)) 319 inode->i_fop = &v9fs_dir_operations_dotl; 320 else 321 inode->i_fop = &v9fs_dir_operations; 322 323 break; 324 default: 325 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 326 mode, mode & S_IFMT); 327 err = -EINVAL; 328 goto error; 329 } 330 331 v9fs_set_netfs_context(inode); 332 error: 333 return err; 334 335 } 336 337 /** 338 * v9fs_get_inode - helper function to setup an inode 339 * @sb: superblock 340 * @mode: mode to setup inode with 341 * @rdev: The device numbers to set 342 */ 343 344 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 345 { 346 int err; 347 struct inode *inode; 348 struct v9fs_session_info *v9ses = sb->s_fs_info; 349 350 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 351 352 inode = new_inode(sb); 353 if (!inode) { 354 pr_warn("%s (%d): Problem allocating inode\n", 355 __func__, task_pid_nr(current)); 356 return ERR_PTR(-ENOMEM); 357 } 358 err = v9fs_init_inode(v9ses, inode, mode, rdev); 359 if (err) { 360 iput(inode); 361 return ERR_PTR(err); 362 } 363 return inode; 364 } 365 366 /** 367 * v9fs_evict_inode - Remove an inode from the inode cache 368 * @inode: inode to release 369 * 370 */ 371 void v9fs_evict_inode(struct inode *inode) 372 { 373 struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode); 374 __le32 __maybe_unused version; 375 376 truncate_inode_pages_final(&inode->i_data); 377 378 #ifdef CONFIG_9P_FSCACHE 379 version = cpu_to_le32(v9inode->qid.version); 380 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode, 381 &version); 382 #endif 383 384 clear_inode(inode); 385 filemap_fdatawrite(&inode->i_data); 386 387 #ifdef CONFIG_9P_FSCACHE 388 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); 389 #endif 390 } 391 392 static int v9fs_test_inode(struct inode *inode, void *data) 393 { 394 int umode; 395 dev_t rdev; 396 struct v9fs_inode *v9inode = V9FS_I(inode); 397 struct p9_wstat *st = (struct p9_wstat *)data; 398 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 399 400 umode = p9mode2unixmode(v9ses, st, &rdev); 401 /* don't match inode of different type */ 402 if (inode_wrong_type(inode, umode)) 403 return 0; 404 405 /* compare qid details */ 406 if (memcmp(&v9inode->qid.version, 407 &st->qid.version, sizeof(v9inode->qid.version))) 408 return 0; 409 410 if (v9inode->qid.type != st->qid.type) 411 return 0; 412 413 if (v9inode->qid.path != st->qid.path) 414 return 0; 415 return 1; 416 } 417 418 static int v9fs_test_new_inode(struct inode *inode, void *data) 419 { 420 return 0; 421 } 422 423 static int v9fs_set_inode(struct inode *inode, void *data) 424 { 425 struct v9fs_inode *v9inode = V9FS_I(inode); 426 struct p9_wstat *st = (struct p9_wstat *)data; 427 428 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 429 return 0; 430 } 431 432 static struct inode *v9fs_qid_iget(struct super_block *sb, 433 struct p9_qid *qid, 434 struct p9_wstat *st, 435 int new) 436 { 437 dev_t rdev; 438 int retval; 439 umode_t umode; 440 unsigned long i_ino; 441 struct inode *inode; 442 struct v9fs_session_info *v9ses = sb->s_fs_info; 443 int (*test)(struct inode *inode, void *data); 444 445 if (new) 446 test = v9fs_test_new_inode; 447 else 448 test = v9fs_test_inode; 449 450 i_ino = v9fs_qid2ino(qid); 451 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 452 if (!inode) 453 return ERR_PTR(-ENOMEM); 454 if (!(inode->i_state & I_NEW)) 455 return inode; 456 /* 457 * initialize the inode with the stat info 458 * FIXME!! we may need support for stale inodes 459 * later. 460 */ 461 inode->i_ino = i_ino; 462 umode = p9mode2unixmode(v9ses, st, &rdev); 463 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 464 if (retval) 465 goto error; 466 467 v9fs_stat2inode(st, inode, sb, 0); 468 v9fs_cache_inode_get_cookie(inode); 469 unlock_new_inode(inode); 470 return inode; 471 error: 472 iget_failed(inode); 473 return ERR_PTR(retval); 474 475 } 476 477 struct inode * 478 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 479 struct super_block *sb, int new) 480 { 481 struct p9_wstat *st; 482 struct inode *inode = NULL; 483 484 st = p9_client_stat(fid); 485 if (IS_ERR(st)) 486 return ERR_CAST(st); 487 488 inode = v9fs_qid_iget(sb, &st->qid, st, new); 489 p9stat_free(st); 490 kfree(st); 491 return inode; 492 } 493 494 /** 495 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 496 * plan 9 AT flag. 497 * @flags: flags to convert 498 */ 499 static int v9fs_at_to_dotl_flags(int flags) 500 { 501 int rflags = 0; 502 503 if (flags & AT_REMOVEDIR) 504 rflags |= P9_DOTL_AT_REMOVEDIR; 505 506 return rflags; 507 } 508 509 /** 510 * v9fs_dec_count - helper functon to drop i_nlink. 511 * 512 * If a directory had nlink <= 2 (including . and ..), then we should not drop 513 * the link count, which indicates the underlying exported fs doesn't maintain 514 * nlink accurately. e.g. 515 * - overlayfs sets nlink to 1 for merged dir 516 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 517 * than EXT4_LINK_MAX (65000) links. 518 * 519 * @inode: inode whose nlink is being dropped 520 */ 521 static void v9fs_dec_count(struct inode *inode) 522 { 523 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 524 drop_nlink(inode); 525 } 526 527 /** 528 * v9fs_remove - helper function to remove files and directories 529 * @dir: directory inode that is being deleted 530 * @dentry: dentry that is being deleted 531 * @flags: removing a directory 532 * 533 */ 534 535 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 536 { 537 struct inode *inode; 538 int retval = -EOPNOTSUPP; 539 struct p9_fid *v9fid, *dfid; 540 struct v9fs_session_info *v9ses; 541 542 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 543 dir, dentry, flags); 544 545 v9ses = v9fs_inode2v9ses(dir); 546 inode = d_inode(dentry); 547 dfid = v9fs_parent_fid(dentry); 548 if (IS_ERR(dfid)) { 549 retval = PTR_ERR(dfid); 550 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 551 return retval; 552 } 553 if (v9fs_proto_dotl(v9ses)) 554 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 555 v9fs_at_to_dotl_flags(flags)); 556 p9_fid_put(dfid); 557 if (retval == -EOPNOTSUPP) { 558 /* Try the one based on path */ 559 v9fid = v9fs_fid_clone(dentry); 560 if (IS_ERR(v9fid)) 561 return PTR_ERR(v9fid); 562 retval = p9_client_remove(v9fid); 563 } 564 if (!retval) { 565 /* 566 * directories on unlink should have zero 567 * link count 568 */ 569 if (flags & AT_REMOVEDIR) { 570 clear_nlink(inode); 571 v9fs_dec_count(dir); 572 } else 573 v9fs_dec_count(inode); 574 575 v9fs_invalidate_inode_attr(inode); 576 v9fs_invalidate_inode_attr(dir); 577 578 /* invalidate all fids associated with dentry */ 579 /* NOTE: This will not include open fids */ 580 dentry->d_op->d_release(dentry); 581 } 582 return retval; 583 } 584 585 /** 586 * v9fs_create - Create a file 587 * @v9ses: session information 588 * @dir: directory that dentry is being created in 589 * @dentry: dentry that is being created 590 * @extension: 9p2000.u extension string to support devices, etc. 591 * @perm: create permissions 592 * @mode: open mode 593 * 594 */ 595 static struct p9_fid * 596 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 597 struct dentry *dentry, char *extension, u32 perm, u8 mode) 598 { 599 int err; 600 const unsigned char *name; 601 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 602 struct inode *inode; 603 604 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 605 606 err = 0; 607 name = dentry->d_name.name; 608 dfid = v9fs_parent_fid(dentry); 609 if (IS_ERR(dfid)) { 610 err = PTR_ERR(dfid); 611 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 612 return ERR_PTR(err); 613 } 614 615 /* clone a fid to use for creation */ 616 ofid = clone_fid(dfid); 617 if (IS_ERR(ofid)) { 618 err = PTR_ERR(ofid); 619 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 620 goto error; 621 } 622 623 err = p9_client_fcreate(ofid, name, perm, mode, extension); 624 if (err < 0) { 625 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 626 goto error; 627 } 628 629 if (!(perm & P9_DMLINK)) { 630 /* now walk from the parent so we can get unopened fid */ 631 fid = p9_client_walk(dfid, 1, &name, 1); 632 if (IS_ERR(fid)) { 633 err = PTR_ERR(fid); 634 p9_debug(P9_DEBUG_VFS, 635 "p9_client_walk failed %d\n", err); 636 goto error; 637 } 638 /* 639 * instantiate inode and assign the unopened fid to the dentry 640 */ 641 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 642 if (IS_ERR(inode)) { 643 err = PTR_ERR(inode); 644 p9_debug(P9_DEBUG_VFS, 645 "inode creation failed %d\n", err); 646 goto error; 647 } 648 v9fs_fid_add(dentry, &fid); 649 d_instantiate(dentry, inode); 650 } 651 p9_fid_put(dfid); 652 return ofid; 653 error: 654 p9_fid_put(dfid); 655 p9_fid_put(ofid); 656 p9_fid_put(fid); 657 return ERR_PTR(err); 658 } 659 660 /** 661 * v9fs_vfs_create - VFS hook to create a regular file 662 * @idmap: idmap of the mount 663 * @dir: The parent directory 664 * @dentry: The name of file to be created 665 * @mode: The UNIX file mode to set 666 * @excl: True if the file must not yet exist 667 * 668 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 669 * for mknod(2). 670 * 671 */ 672 673 static int 674 v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir, 675 struct dentry *dentry, umode_t mode, bool excl) 676 { 677 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 678 u32 perm = unixmode2p9mode(v9ses, mode); 679 struct p9_fid *fid; 680 681 /* P9_OEXCL? */ 682 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 683 if (IS_ERR(fid)) 684 return PTR_ERR(fid); 685 686 v9fs_invalidate_inode_attr(dir); 687 p9_fid_put(fid); 688 689 return 0; 690 } 691 692 /** 693 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 694 * @idmap: idmap of the mount 695 * @dir: inode that is being unlinked 696 * @dentry: dentry that is being unlinked 697 * @mode: mode for new directory 698 * 699 */ 700 701 static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 702 struct dentry *dentry, umode_t mode) 703 { 704 int err; 705 u32 perm; 706 struct p9_fid *fid; 707 struct v9fs_session_info *v9ses; 708 709 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 710 err = 0; 711 v9ses = v9fs_inode2v9ses(dir); 712 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 713 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 714 if (IS_ERR(fid)) { 715 err = PTR_ERR(fid); 716 fid = NULL; 717 } else { 718 inc_nlink(dir); 719 v9fs_invalidate_inode_attr(dir); 720 } 721 722 if (fid) 723 p9_fid_put(fid); 724 725 return err; 726 } 727 728 /** 729 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 730 * @dir: inode that is being walked from 731 * @dentry: dentry that is being walked to? 732 * @flags: lookup flags (unused) 733 * 734 */ 735 736 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 737 unsigned int flags) 738 { 739 struct dentry *res; 740 struct v9fs_session_info *v9ses; 741 struct p9_fid *dfid, *fid; 742 struct inode *inode; 743 const unsigned char *name; 744 745 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 746 dir, dentry, dentry, flags); 747 748 if (dentry->d_name.len > NAME_MAX) 749 return ERR_PTR(-ENAMETOOLONG); 750 751 v9ses = v9fs_inode2v9ses(dir); 752 /* We can walk d_parent because we hold the dir->i_mutex */ 753 dfid = v9fs_parent_fid(dentry); 754 if (IS_ERR(dfid)) 755 return ERR_CAST(dfid); 756 757 /* 758 * Make sure we don't use a wrong inode due to parallel 759 * unlink. For cached mode create calls request for new 760 * inode. But with cache disabled, lookup should do this. 761 */ 762 name = dentry->d_name.name; 763 fid = p9_client_walk(dfid, 1, &name, 1); 764 p9_fid_put(dfid); 765 if (fid == ERR_PTR(-ENOENT)) 766 inode = NULL; 767 else if (IS_ERR(fid)) 768 inode = ERR_CAST(fid); 769 else if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) 770 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 771 else 772 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 773 /* 774 * If we had a rename on the server and a parallel lookup 775 * for the new name, then make sure we instantiate with 776 * the new name. ie look up for a/b, while on server somebody 777 * moved b under k and client parallely did a lookup for 778 * k/b. 779 */ 780 res = d_splice_alias(inode, dentry); 781 if (!IS_ERR(fid)) { 782 if (!res) 783 v9fs_fid_add(dentry, &fid); 784 else if (!IS_ERR(res)) 785 v9fs_fid_add(res, &fid); 786 else 787 p9_fid_put(fid); 788 } 789 return res; 790 } 791 792 static int 793 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 794 struct file *file, unsigned int flags, umode_t mode) 795 { 796 int err; 797 u32 perm; 798 struct v9fs_inode __maybe_unused *v9inode; 799 struct v9fs_session_info *v9ses; 800 struct p9_fid *fid; 801 struct dentry *res = NULL; 802 struct inode *inode; 803 int p9_omode; 804 805 if (d_in_lookup(dentry)) { 806 res = v9fs_vfs_lookup(dir, dentry, 0); 807 if (IS_ERR(res)) 808 return PTR_ERR(res); 809 810 if (res) 811 dentry = res; 812 } 813 814 /* Only creates */ 815 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 816 return finish_no_open(file, res); 817 818 err = 0; 819 820 v9ses = v9fs_inode2v9ses(dir); 821 perm = unixmode2p9mode(v9ses, mode); 822 p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses)); 823 824 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { 825 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; 826 p9_debug(P9_DEBUG_CACHE, 827 "write-only file with writeback enabled, creating w/ O_RDWR\n"); 828 } 829 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode); 830 if (IS_ERR(fid)) { 831 err = PTR_ERR(fid); 832 goto error; 833 } 834 835 v9fs_invalidate_inode_attr(dir); 836 inode = d_inode(dentry); 837 v9inode = V9FS_I(inode); 838 err = finish_open(file, dentry, generic_file_open); 839 if (err) 840 goto error; 841 842 file->private_data = fid; 843 #ifdef CONFIG_9P_FSCACHE 844 if (v9ses->cache & CACHE_FSCACHE) 845 fscache_use_cookie(v9fs_inode_cookie(v9inode), 846 file->f_mode & FMODE_WRITE); 847 #endif 848 849 v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags); 850 v9fs_open_fid_add(inode, &fid); 851 852 file->f_mode |= FMODE_CREATED; 853 out: 854 dput(res); 855 return err; 856 857 error: 858 p9_fid_put(fid); 859 goto out; 860 } 861 862 /** 863 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 864 * @i: inode that is being unlinked 865 * @d: dentry that is being unlinked 866 * 867 */ 868 869 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 870 { 871 return v9fs_remove(i, d, 0); 872 } 873 874 /** 875 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 876 * @i: inode that is being unlinked 877 * @d: dentry that is being unlinked 878 * 879 */ 880 881 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 882 { 883 return v9fs_remove(i, d, AT_REMOVEDIR); 884 } 885 886 /** 887 * v9fs_vfs_rename - VFS hook to rename an inode 888 * @idmap: The idmap of the mount 889 * @old_dir: old dir inode 890 * @old_dentry: old dentry 891 * @new_dir: new dir inode 892 * @new_dentry: new dentry 893 * @flags: RENAME_* flags 894 * 895 */ 896 897 int 898 v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 899 struct dentry *old_dentry, struct inode *new_dir, 900 struct dentry *new_dentry, unsigned int flags) 901 { 902 int retval; 903 struct inode *old_inode; 904 struct inode *new_inode; 905 struct v9fs_session_info *v9ses; 906 struct p9_fid *oldfid = NULL, *dfid = NULL; 907 struct p9_fid *olddirfid = NULL; 908 struct p9_fid *newdirfid = NULL; 909 struct p9_wstat wstat; 910 911 if (flags) 912 return -EINVAL; 913 914 p9_debug(P9_DEBUG_VFS, "\n"); 915 retval = 0; 916 old_inode = d_inode(old_dentry); 917 new_inode = d_inode(new_dentry); 918 v9ses = v9fs_inode2v9ses(old_inode); 919 oldfid = v9fs_fid_lookup(old_dentry); 920 if (IS_ERR(oldfid)) 921 return PTR_ERR(oldfid); 922 923 dfid = v9fs_parent_fid(old_dentry); 924 olddirfid = clone_fid(dfid); 925 p9_fid_put(dfid); 926 dfid = NULL; 927 928 if (IS_ERR(olddirfid)) { 929 retval = PTR_ERR(olddirfid); 930 goto error; 931 } 932 933 dfid = v9fs_parent_fid(new_dentry); 934 newdirfid = clone_fid(dfid); 935 p9_fid_put(dfid); 936 dfid = NULL; 937 938 if (IS_ERR(newdirfid)) { 939 retval = PTR_ERR(newdirfid); 940 goto error; 941 } 942 943 down_write(&v9ses->rename_sem); 944 if (v9fs_proto_dotl(v9ses)) { 945 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 946 newdirfid, new_dentry->d_name.name); 947 if (retval == -EOPNOTSUPP) 948 retval = p9_client_rename(oldfid, newdirfid, 949 new_dentry->d_name.name); 950 if (retval != -EOPNOTSUPP) 951 goto error_locked; 952 } 953 if (old_dentry->d_parent != new_dentry->d_parent) { 954 /* 955 * 9P .u can only handle file rename in the same directory 956 */ 957 958 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 959 retval = -EXDEV; 960 goto error_locked; 961 } 962 v9fs_blank_wstat(&wstat); 963 wstat.muid = v9ses->uname; 964 wstat.name = new_dentry->d_name.name; 965 retval = p9_client_wstat(oldfid, &wstat); 966 967 error_locked: 968 if (!retval) { 969 if (new_inode) { 970 if (S_ISDIR(new_inode->i_mode)) 971 clear_nlink(new_inode); 972 else 973 v9fs_dec_count(new_inode); 974 } 975 if (S_ISDIR(old_inode->i_mode)) { 976 if (!new_inode) 977 inc_nlink(new_dir); 978 v9fs_dec_count(old_dir); 979 } 980 v9fs_invalidate_inode_attr(old_inode); 981 v9fs_invalidate_inode_attr(old_dir); 982 v9fs_invalidate_inode_attr(new_dir); 983 984 /* successful rename */ 985 d_move(old_dentry, new_dentry); 986 } 987 up_write(&v9ses->rename_sem); 988 989 error: 990 p9_fid_put(newdirfid); 991 p9_fid_put(olddirfid); 992 p9_fid_put(oldfid); 993 return retval; 994 } 995 996 /** 997 * v9fs_vfs_getattr - retrieve file metadata 998 * @idmap: idmap of the mount 999 * @path: Object to query 1000 * @stat: metadata structure to populate 1001 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1002 * @flags: AT_STATX_xxx setting 1003 * 1004 */ 1005 1006 static int 1007 v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path, 1008 struct kstat *stat, u32 request_mask, unsigned int flags) 1009 { 1010 struct dentry *dentry = path->dentry; 1011 struct inode *inode = d_inode(dentry); 1012 struct v9fs_session_info *v9ses; 1013 struct p9_fid *fid; 1014 struct p9_wstat *st; 1015 1016 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1017 v9ses = v9fs_dentry2v9ses(dentry); 1018 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 1019 generic_fillattr(&nop_mnt_idmap, inode, stat); 1020 return 0; 1021 } else if (v9ses->cache & CACHE_WRITEBACK) { 1022 if (S_ISREG(inode->i_mode)) { 1023 int retval = filemap_fdatawrite(inode->i_mapping); 1024 1025 if (retval) 1026 p9_debug(P9_DEBUG_ERROR, 1027 "flushing writeback during getattr returned %d\n", retval); 1028 } 1029 } 1030 fid = v9fs_fid_lookup(dentry); 1031 if (IS_ERR(fid)) 1032 return PTR_ERR(fid); 1033 1034 st = p9_client_stat(fid); 1035 p9_fid_put(fid); 1036 if (IS_ERR(st)) 1037 return PTR_ERR(st); 1038 1039 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1040 generic_fillattr(&nop_mnt_idmap, d_inode(dentry), stat); 1041 1042 p9stat_free(st); 1043 kfree(st); 1044 return 0; 1045 } 1046 1047 /** 1048 * v9fs_vfs_setattr - set file metadata 1049 * @idmap: idmap of the mount 1050 * @dentry: file whose metadata to set 1051 * @iattr: metadata assignment structure 1052 * 1053 */ 1054 1055 static int v9fs_vfs_setattr(struct mnt_idmap *idmap, 1056 struct dentry *dentry, struct iattr *iattr) 1057 { 1058 int retval, use_dentry = 0; 1059 struct inode *inode = d_inode(dentry); 1060 struct v9fs_session_info *v9ses; 1061 struct p9_fid *fid = NULL; 1062 struct p9_wstat wstat; 1063 1064 p9_debug(P9_DEBUG_VFS, "\n"); 1065 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); 1066 if (retval) 1067 return retval; 1068 1069 retval = -EPERM; 1070 v9ses = v9fs_dentry2v9ses(dentry); 1071 if (iattr->ia_valid & ATTR_FILE) { 1072 fid = iattr->ia_file->private_data; 1073 WARN_ON(!fid); 1074 } 1075 if (!fid) { 1076 fid = v9fs_fid_lookup(dentry); 1077 use_dentry = 1; 1078 } 1079 if (IS_ERR(fid)) 1080 return PTR_ERR(fid); 1081 1082 v9fs_blank_wstat(&wstat); 1083 if (iattr->ia_valid & ATTR_MODE) 1084 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1085 1086 if (iattr->ia_valid & ATTR_MTIME) 1087 wstat.mtime = iattr->ia_mtime.tv_sec; 1088 1089 if (iattr->ia_valid & ATTR_ATIME) 1090 wstat.atime = iattr->ia_atime.tv_sec; 1091 1092 if (iattr->ia_valid & ATTR_SIZE) 1093 wstat.length = iattr->ia_size; 1094 1095 if (v9fs_proto_dotu(v9ses)) { 1096 if (iattr->ia_valid & ATTR_UID) 1097 wstat.n_uid = iattr->ia_uid; 1098 1099 if (iattr->ia_valid & ATTR_GID) 1100 wstat.n_gid = iattr->ia_gid; 1101 } 1102 1103 /* Write all dirty data */ 1104 if (d_is_reg(dentry)) { 1105 retval = filemap_fdatawrite(inode->i_mapping); 1106 if (retval) 1107 p9_debug(P9_DEBUG_ERROR, 1108 "flushing writeback during setattr returned %d\n", retval); 1109 } 1110 1111 retval = p9_client_wstat(fid, &wstat); 1112 1113 if (use_dentry) 1114 p9_fid_put(fid); 1115 1116 if (retval < 0) 1117 return retval; 1118 1119 if ((iattr->ia_valid & ATTR_SIZE) && 1120 iattr->ia_size != i_size_read(inode)) { 1121 truncate_setsize(inode, iattr->ia_size); 1122 truncate_pagecache(inode, iattr->ia_size); 1123 1124 #ifdef CONFIG_9P_FSCACHE 1125 if (v9ses->cache & CACHE_FSCACHE) { 1126 struct v9fs_inode *v9inode = V9FS_I(inode); 1127 1128 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1129 } 1130 #endif 1131 } 1132 1133 v9fs_invalidate_inode_attr(inode); 1134 1135 setattr_copy(&nop_mnt_idmap, inode, iattr); 1136 mark_inode_dirty(inode); 1137 return 0; 1138 } 1139 1140 /** 1141 * v9fs_stat2inode - populate an inode structure with mistat info 1142 * @stat: Plan 9 metadata (mistat) structure 1143 * @inode: inode to populate 1144 * @sb: superblock of filesystem 1145 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1146 * 1147 */ 1148 1149 void 1150 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1151 struct super_block *sb, unsigned int flags) 1152 { 1153 umode_t mode; 1154 struct v9fs_session_info *v9ses = sb->s_fs_info; 1155 struct v9fs_inode *v9inode = V9FS_I(inode); 1156 1157 set_nlink(inode, 1); 1158 1159 inode->i_atime.tv_sec = stat->atime; 1160 inode->i_mtime.tv_sec = stat->mtime; 1161 inode->i_ctime.tv_sec = stat->mtime; 1162 1163 inode->i_uid = v9ses->dfltuid; 1164 inode->i_gid = v9ses->dfltgid; 1165 1166 if (v9fs_proto_dotu(v9ses)) { 1167 inode->i_uid = stat->n_uid; 1168 inode->i_gid = stat->n_gid; 1169 } 1170 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1171 if (v9fs_proto_dotu(v9ses)) { 1172 unsigned int i_nlink; 1173 /* 1174 * Hadlink support got added later to the .u extension. 1175 * So there can be a server out there that doesn't 1176 * support this even with .u extension. That would 1177 * just leave us with stat->extension being an empty 1178 * string, though. 1179 */ 1180 /* HARDLINKCOUNT %u */ 1181 if (sscanf(stat->extension, 1182 " HARDLINKCOUNT %u", &i_nlink) == 1) 1183 set_nlink(inode, i_nlink); 1184 } 1185 } 1186 mode = p9mode2perm(v9ses, stat); 1187 mode |= inode->i_mode & ~S_IALLUGO; 1188 inode->i_mode = mode; 1189 1190 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1191 v9fs_i_size_write(inode, stat->length); 1192 /* not real number of blocks, but 512 byte ones ... */ 1193 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1194 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1195 } 1196 1197 /** 1198 * v9fs_qid2ino - convert qid into inode number 1199 * @qid: qid to hash 1200 * 1201 * BUG: potential for inode number collisions? 1202 */ 1203 1204 ino_t v9fs_qid2ino(struct p9_qid *qid) 1205 { 1206 u64 path = qid->path + 2; 1207 ino_t i = 0; 1208 1209 if (sizeof(ino_t) == sizeof(path)) 1210 memcpy(&i, &path, sizeof(ino_t)); 1211 else 1212 i = (ino_t) (path ^ (path >> 32)); 1213 1214 return i; 1215 } 1216 1217 /** 1218 * v9fs_vfs_get_link - follow a symlink path 1219 * @dentry: dentry for symlink 1220 * @inode: inode for symlink 1221 * @done: delayed call for when we are done with the return value 1222 */ 1223 1224 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1225 struct inode *inode, 1226 struct delayed_call *done) 1227 { 1228 struct v9fs_session_info *v9ses; 1229 struct p9_fid *fid; 1230 struct p9_wstat *st; 1231 char *res; 1232 1233 if (!dentry) 1234 return ERR_PTR(-ECHILD); 1235 1236 v9ses = v9fs_dentry2v9ses(dentry); 1237 if (!v9fs_proto_dotu(v9ses)) 1238 return ERR_PTR(-EBADF); 1239 1240 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1241 fid = v9fs_fid_lookup(dentry); 1242 1243 if (IS_ERR(fid)) 1244 return ERR_CAST(fid); 1245 1246 st = p9_client_stat(fid); 1247 p9_fid_put(fid); 1248 if (IS_ERR(st)) 1249 return ERR_CAST(st); 1250 1251 if (!(st->mode & P9_DMSYMLINK)) { 1252 p9stat_free(st); 1253 kfree(st); 1254 return ERR_PTR(-EINVAL); 1255 } 1256 res = st->extension; 1257 st->extension = NULL; 1258 if (strlen(res) >= PATH_MAX) 1259 res[PATH_MAX - 1] = '\0'; 1260 1261 p9stat_free(st); 1262 kfree(st); 1263 set_delayed_call(done, kfree_link, res); 1264 return res; 1265 } 1266 1267 /** 1268 * v9fs_vfs_mkspecial - create a special file 1269 * @dir: inode to create special file in 1270 * @dentry: dentry to create 1271 * @perm: mode to create special file 1272 * @extension: 9p2000.u format extension string representing special file 1273 * 1274 */ 1275 1276 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1277 u32 perm, const char *extension) 1278 { 1279 struct p9_fid *fid; 1280 struct v9fs_session_info *v9ses; 1281 1282 v9ses = v9fs_inode2v9ses(dir); 1283 if (!v9fs_proto_dotu(v9ses)) { 1284 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1285 return -EPERM; 1286 } 1287 1288 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1289 P9_OREAD); 1290 if (IS_ERR(fid)) 1291 return PTR_ERR(fid); 1292 1293 v9fs_invalidate_inode_attr(dir); 1294 p9_fid_put(fid); 1295 return 0; 1296 } 1297 1298 /** 1299 * v9fs_vfs_symlink - helper function to create symlinks 1300 * @idmap: idmap of the mount 1301 * @dir: directory inode containing symlink 1302 * @dentry: dentry for symlink 1303 * @symname: symlink data 1304 * 1305 * See Also: 9P2000.u RFC for more information 1306 * 1307 */ 1308 1309 static int 1310 v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir, 1311 struct dentry *dentry, const char *symname) 1312 { 1313 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1314 dir->i_ino, dentry, symname); 1315 1316 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1317 } 1318 1319 #define U32_MAX_DIGITS 10 1320 1321 /** 1322 * v9fs_vfs_link - create a hardlink 1323 * @old_dentry: dentry for file to link to 1324 * @dir: inode destination for new link 1325 * @dentry: dentry for link 1326 * 1327 */ 1328 1329 static int 1330 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1331 struct dentry *dentry) 1332 { 1333 int retval; 1334 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1335 struct p9_fid *oldfid; 1336 1337 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1338 dir->i_ino, dentry, old_dentry); 1339 1340 oldfid = v9fs_fid_clone(old_dentry); 1341 if (IS_ERR(oldfid)) 1342 return PTR_ERR(oldfid); 1343 1344 sprintf(name, "%d\n", oldfid->fid); 1345 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1346 if (!retval) { 1347 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1348 v9fs_invalidate_inode_attr(dir); 1349 } 1350 p9_fid_put(oldfid); 1351 return retval; 1352 } 1353 1354 /** 1355 * v9fs_vfs_mknod - create a special file 1356 * @idmap: idmap of the mount 1357 * @dir: inode destination for new link 1358 * @dentry: dentry for file 1359 * @mode: mode for creation 1360 * @rdev: device associated with special file 1361 * 1362 */ 1363 1364 static int 1365 v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir, 1366 struct dentry *dentry, umode_t mode, dev_t rdev) 1367 { 1368 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1369 int retval; 1370 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1371 u32 perm; 1372 1373 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1374 dir->i_ino, dentry, mode, 1375 MAJOR(rdev), MINOR(rdev)); 1376 1377 /* build extension */ 1378 if (S_ISBLK(mode)) 1379 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1380 else if (S_ISCHR(mode)) 1381 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1382 else 1383 *name = 0; 1384 1385 perm = unixmode2p9mode(v9ses, mode); 1386 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1387 1388 return retval; 1389 } 1390 1391 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1392 { 1393 int umode; 1394 dev_t rdev; 1395 struct p9_wstat *st; 1396 struct v9fs_session_info *v9ses; 1397 unsigned int flags; 1398 1399 v9ses = v9fs_inode2v9ses(inode); 1400 st = p9_client_stat(fid); 1401 if (IS_ERR(st)) 1402 return PTR_ERR(st); 1403 /* 1404 * Don't update inode if the file type is different 1405 */ 1406 umode = p9mode2unixmode(v9ses, st, &rdev); 1407 if (inode_wrong_type(inode, umode)) 1408 goto out; 1409 1410 /* 1411 * We don't want to refresh inode->i_size, 1412 * because we may have cached data 1413 */ 1414 flags = (v9ses->cache & CACHE_LOOSE) ? 1415 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1416 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1417 out: 1418 p9stat_free(st); 1419 kfree(st); 1420 return 0; 1421 } 1422 1423 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1424 .create = v9fs_vfs_create, 1425 .lookup = v9fs_vfs_lookup, 1426 .atomic_open = v9fs_vfs_atomic_open, 1427 .symlink = v9fs_vfs_symlink, 1428 .link = v9fs_vfs_link, 1429 .unlink = v9fs_vfs_unlink, 1430 .mkdir = v9fs_vfs_mkdir, 1431 .rmdir = v9fs_vfs_rmdir, 1432 .mknod = v9fs_vfs_mknod, 1433 .rename = v9fs_vfs_rename, 1434 .getattr = v9fs_vfs_getattr, 1435 .setattr = v9fs_vfs_setattr, 1436 }; 1437 1438 static const struct inode_operations v9fs_dir_inode_operations = { 1439 .create = v9fs_vfs_create, 1440 .lookup = v9fs_vfs_lookup, 1441 .atomic_open = v9fs_vfs_atomic_open, 1442 .unlink = v9fs_vfs_unlink, 1443 .mkdir = v9fs_vfs_mkdir, 1444 .rmdir = v9fs_vfs_rmdir, 1445 .mknod = v9fs_vfs_mknod, 1446 .rename = v9fs_vfs_rename, 1447 .getattr = v9fs_vfs_getattr, 1448 .setattr = v9fs_vfs_setattr, 1449 }; 1450 1451 static const struct inode_operations v9fs_file_inode_operations = { 1452 .getattr = v9fs_vfs_getattr, 1453 .setattr = v9fs_vfs_setattr, 1454 }; 1455 1456 static const struct inode_operations v9fs_symlink_inode_operations = { 1457 .get_link = v9fs_vfs_get_link, 1458 .getattr = v9fs_vfs_getattr, 1459 .setattr = v9fs_vfs_setattr, 1460 }; 1461 1462