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 & 0777; /* S_IRWXUGO */ 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 switch (uflags&3) { 167 default: 168 case O_RDONLY: 169 ret = P9_OREAD; 170 break; 171 172 case O_WRONLY: 173 ret = P9_OWRITE; 174 break; 175 176 case O_RDWR: 177 ret = P9_ORDWR; 178 break; 179 } 180 181 if (uflags & O_TRUNC) 182 ret |= P9_OTRUNC; 183 184 if (extended) { 185 if (uflags & O_EXCL) 186 ret |= P9_OEXCL; 187 188 if (uflags & O_APPEND) 189 ret |= P9_OAPPEND; 190 } 191 192 return ret; 193 } 194 195 /** 196 * v9fs_blank_wstat - helper function to setup a 9P stat structure 197 * @wstat: structure to initialize 198 * 199 */ 200 201 void 202 v9fs_blank_wstat(struct p9_wstat *wstat) 203 { 204 wstat->type = ~0; 205 wstat->dev = ~0; 206 wstat->qid.type = ~0; 207 wstat->qid.version = ~0; 208 *((long long *)&wstat->qid.path) = ~0; 209 wstat->mode = ~0; 210 wstat->atime = ~0; 211 wstat->mtime = ~0; 212 wstat->length = ~0; 213 wstat->name = NULL; 214 wstat->uid = NULL; 215 wstat->gid = NULL; 216 wstat->muid = NULL; 217 wstat->n_uid = INVALID_UID; 218 wstat->n_gid = INVALID_GID; 219 wstat->n_muid = INVALID_UID; 220 wstat->extension = NULL; 221 } 222 223 /** 224 * v9fs_alloc_inode - helper function to allocate an inode 225 * @sb: The superblock to allocate the inode from 226 */ 227 struct inode *v9fs_alloc_inode(struct super_block *sb) 228 { 229 struct v9fs_inode *v9inode; 230 231 v9inode = alloc_inode_sb(sb, v9fs_inode_cache, GFP_KERNEL); 232 if (!v9inode) 233 return NULL; 234 v9inode->cache_validity = 0; 235 mutex_init(&v9inode->v_mutex); 236 return &v9inode->netfs.inode; 237 } 238 239 /** 240 * v9fs_free_inode - destroy an inode 241 * @inode: The inode to be freed 242 */ 243 244 void v9fs_free_inode(struct inode *inode) 245 { 246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 247 } 248 249 /* 250 * Set parameters for the netfs library 251 */ 252 void v9fs_set_netfs_context(struct inode *inode) 253 { 254 struct v9fs_inode *v9inode = V9FS_I(inode); 255 netfs_inode_init(&v9inode->netfs, &v9fs_req_ops); 256 } 257 258 int v9fs_init_inode(struct v9fs_session_info *v9ses, 259 struct inode *inode, umode_t mode, dev_t rdev) 260 { 261 int err = 0; 262 263 inode_init_owner(&nop_mnt_idmap, inode, NULL, mode); 264 inode->i_blocks = 0; 265 inode->i_rdev = rdev; 266 inode->i_atime = inode->i_mtime = inode_set_ctime_current(inode); 267 inode->i_mapping->a_ops = &v9fs_addr_operations; 268 inode->i_private = NULL; 269 270 switch (mode & S_IFMT) { 271 case S_IFIFO: 272 case S_IFBLK: 273 case S_IFCHR: 274 case S_IFSOCK: 275 if (v9fs_proto_dotl(v9ses)) { 276 inode->i_op = &v9fs_file_inode_operations_dotl; 277 } else if (v9fs_proto_dotu(v9ses)) { 278 inode->i_op = &v9fs_file_inode_operations; 279 } else { 280 p9_debug(P9_DEBUG_ERROR, 281 "special files without extended mode\n"); 282 err = -EINVAL; 283 goto error; 284 } 285 init_special_inode(inode, inode->i_mode, inode->i_rdev); 286 break; 287 case S_IFREG: 288 if (v9fs_proto_dotl(v9ses)) { 289 inode->i_op = &v9fs_file_inode_operations_dotl; 290 inode->i_fop = &v9fs_file_operations_dotl; 291 } else { 292 inode->i_op = &v9fs_file_inode_operations; 293 inode->i_fop = &v9fs_file_operations; 294 } 295 296 break; 297 case S_IFLNK: 298 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 299 p9_debug(P9_DEBUG_ERROR, 300 "extended modes used with legacy protocol\n"); 301 err = -EINVAL; 302 goto error; 303 } 304 305 if (v9fs_proto_dotl(v9ses)) 306 inode->i_op = &v9fs_symlink_inode_operations_dotl; 307 else 308 inode->i_op = &v9fs_symlink_inode_operations; 309 310 break; 311 case S_IFDIR: 312 inc_nlink(inode); 313 if (v9fs_proto_dotl(v9ses)) 314 inode->i_op = &v9fs_dir_inode_operations_dotl; 315 else if (v9fs_proto_dotu(v9ses)) 316 inode->i_op = &v9fs_dir_inode_operations_dotu; 317 else 318 inode->i_op = &v9fs_dir_inode_operations; 319 320 if (v9fs_proto_dotl(v9ses)) 321 inode->i_fop = &v9fs_dir_operations_dotl; 322 else 323 inode->i_fop = &v9fs_dir_operations; 324 325 break; 326 default: 327 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 328 mode, mode & S_IFMT); 329 err = -EINVAL; 330 goto error; 331 } 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 v9fs_set_netfs_context(inode); 364 return inode; 365 } 366 367 /** 368 * v9fs_evict_inode - Remove an inode from the inode cache 369 * @inode: inode to release 370 * 371 */ 372 void v9fs_evict_inode(struct inode *inode) 373 { 374 struct v9fs_inode __maybe_unused *v9inode = V9FS_I(inode); 375 __le32 __maybe_unused version; 376 377 truncate_inode_pages_final(&inode->i_data); 378 379 #ifdef CONFIG_9P_FSCACHE 380 version = cpu_to_le32(v9inode->qid.version); 381 fscache_clear_inode_writeback(v9fs_inode_cookie(v9inode), inode, 382 &version); 383 #endif 384 385 clear_inode(inode); 386 filemap_fdatawrite(&inode->i_data); 387 388 #ifdef CONFIG_9P_FSCACHE 389 fscache_relinquish_cookie(v9fs_inode_cookie(v9inode), false); 390 #endif 391 } 392 393 static int v9fs_test_inode(struct inode *inode, void *data) 394 { 395 int umode; 396 dev_t rdev; 397 struct v9fs_inode *v9inode = V9FS_I(inode); 398 struct p9_wstat *st = (struct p9_wstat *)data; 399 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 400 401 umode = p9mode2unixmode(v9ses, st, &rdev); 402 /* don't match inode of different type */ 403 if (inode_wrong_type(inode, umode)) 404 return 0; 405 406 /* compare qid details */ 407 if (memcmp(&v9inode->qid.version, 408 &st->qid.version, sizeof(v9inode->qid.version))) 409 return 0; 410 411 if (v9inode->qid.type != st->qid.type) 412 return 0; 413 414 if (v9inode->qid.path != st->qid.path) 415 return 0; 416 return 1; 417 } 418 419 static int v9fs_test_new_inode(struct inode *inode, void *data) 420 { 421 return 0; 422 } 423 424 static int v9fs_set_inode(struct inode *inode, void *data) 425 { 426 struct v9fs_inode *v9inode = V9FS_I(inode); 427 struct p9_wstat *st = (struct p9_wstat *)data; 428 429 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 430 return 0; 431 } 432 433 static struct inode *v9fs_qid_iget(struct super_block *sb, 434 struct p9_qid *qid, 435 struct p9_wstat *st, 436 int new) 437 { 438 dev_t rdev; 439 int retval; 440 umode_t umode; 441 unsigned long i_ino; 442 struct inode *inode; 443 struct v9fs_session_info *v9ses = sb->s_fs_info; 444 int (*test)(struct inode *inode, void *data); 445 446 if (new) 447 test = v9fs_test_new_inode; 448 else 449 test = v9fs_test_inode; 450 451 i_ino = v9fs_qid2ino(qid); 452 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 453 if (!inode) 454 return ERR_PTR(-ENOMEM); 455 if (!(inode->i_state & I_NEW)) 456 return inode; 457 /* 458 * initialize the inode with the stat info 459 * FIXME!! we may need support for stale inodes 460 * later. 461 */ 462 inode->i_ino = i_ino; 463 umode = p9mode2unixmode(v9ses, st, &rdev); 464 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 465 if (retval) 466 goto error; 467 468 v9fs_stat2inode(st, inode, sb, 0); 469 v9fs_set_netfs_context(inode); 470 v9fs_cache_inode_get_cookie(inode); 471 unlock_new_inode(inode); 472 return inode; 473 error: 474 iget_failed(inode); 475 return ERR_PTR(retval); 476 477 } 478 479 struct inode * 480 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 481 struct super_block *sb, int new) 482 { 483 struct p9_wstat *st; 484 struct inode *inode = NULL; 485 486 st = p9_client_stat(fid); 487 if (IS_ERR(st)) 488 return ERR_CAST(st); 489 490 inode = v9fs_qid_iget(sb, &st->qid, st, new); 491 p9stat_free(st); 492 kfree(st); 493 return inode; 494 } 495 496 /** 497 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 498 * plan 9 AT flag. 499 * @flags: flags to convert 500 */ 501 static int v9fs_at_to_dotl_flags(int flags) 502 { 503 int rflags = 0; 504 505 if (flags & AT_REMOVEDIR) 506 rflags |= P9_DOTL_AT_REMOVEDIR; 507 508 return rflags; 509 } 510 511 /** 512 * v9fs_dec_count - helper functon to drop i_nlink. 513 * 514 * If a directory had nlink <= 2 (including . and ..), then we should not drop 515 * the link count, which indicates the underlying exported fs doesn't maintain 516 * nlink accurately. e.g. 517 * - overlayfs sets nlink to 1 for merged dir 518 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 519 * than EXT4_LINK_MAX (65000) links. 520 * 521 * @inode: inode whose nlink is being dropped 522 */ 523 static void v9fs_dec_count(struct inode *inode) 524 { 525 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 526 drop_nlink(inode); 527 } 528 529 /** 530 * v9fs_remove - helper function to remove files and directories 531 * @dir: directory inode that is being deleted 532 * @dentry: dentry that is being deleted 533 * @flags: removing a directory 534 * 535 */ 536 537 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 538 { 539 struct inode *inode; 540 int retval = -EOPNOTSUPP; 541 struct p9_fid *v9fid, *dfid; 542 struct v9fs_session_info *v9ses; 543 544 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 545 dir, dentry, flags); 546 547 v9ses = v9fs_inode2v9ses(dir); 548 inode = d_inode(dentry); 549 dfid = v9fs_parent_fid(dentry); 550 if (IS_ERR(dfid)) { 551 retval = PTR_ERR(dfid); 552 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 553 return retval; 554 } 555 if (v9fs_proto_dotl(v9ses)) 556 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 557 v9fs_at_to_dotl_flags(flags)); 558 p9_fid_put(dfid); 559 if (retval == -EOPNOTSUPP) { 560 /* Try the one based on path */ 561 v9fid = v9fs_fid_clone(dentry); 562 if (IS_ERR(v9fid)) 563 return PTR_ERR(v9fid); 564 retval = p9_client_remove(v9fid); 565 } 566 if (!retval) { 567 /* 568 * directories on unlink should have zero 569 * link count 570 */ 571 if (flags & AT_REMOVEDIR) { 572 clear_nlink(inode); 573 v9fs_dec_count(dir); 574 } else 575 v9fs_dec_count(inode); 576 577 v9fs_invalidate_inode_attr(inode); 578 v9fs_invalidate_inode_attr(dir); 579 580 /* invalidate all fids associated with dentry */ 581 /* NOTE: This will not include open fids */ 582 dentry->d_op->d_release(dentry); 583 } 584 return retval; 585 } 586 587 /** 588 * v9fs_create - Create a file 589 * @v9ses: session information 590 * @dir: directory that dentry is being created in 591 * @dentry: dentry that is being created 592 * @extension: 9p2000.u extension string to support devices, etc. 593 * @perm: create permissions 594 * @mode: open mode 595 * 596 */ 597 static struct p9_fid * 598 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 599 struct dentry *dentry, char *extension, u32 perm, u8 mode) 600 { 601 int err; 602 const unsigned char *name; 603 struct p9_fid *dfid, *ofid = NULL, *fid = NULL; 604 struct inode *inode; 605 606 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 607 608 name = dentry->d_name.name; 609 dfid = v9fs_parent_fid(dentry); 610 if (IS_ERR(dfid)) { 611 err = PTR_ERR(dfid); 612 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 613 return ERR_PTR(err); 614 } 615 616 /* clone a fid to use for creation */ 617 ofid = clone_fid(dfid); 618 if (IS_ERR(ofid)) { 619 err = PTR_ERR(ofid); 620 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 621 goto error; 622 } 623 624 err = p9_client_fcreate(ofid, name, perm, mode, extension); 625 if (err < 0) { 626 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 627 goto error; 628 } 629 630 if (!(perm & P9_DMLINK)) { 631 /* now walk from the parent so we can get unopened fid */ 632 fid = p9_client_walk(dfid, 1, &name, 1); 633 if (IS_ERR(fid)) { 634 err = PTR_ERR(fid); 635 p9_debug(P9_DEBUG_VFS, 636 "p9_client_walk failed %d\n", err); 637 goto error; 638 } 639 /* 640 * instantiate inode and assign the unopened fid to the dentry 641 */ 642 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 643 if (IS_ERR(inode)) { 644 err = PTR_ERR(inode); 645 p9_debug(P9_DEBUG_VFS, 646 "inode creation failed %d\n", err); 647 goto error; 648 } 649 v9fs_fid_add(dentry, &fid); 650 d_instantiate(dentry, inode); 651 } 652 p9_fid_put(dfid); 653 return ofid; 654 error: 655 p9_fid_put(dfid); 656 p9_fid_put(ofid); 657 p9_fid_put(fid); 658 return ERR_PTR(err); 659 } 660 661 /** 662 * v9fs_vfs_create - VFS hook to create a regular file 663 * @idmap: idmap of the mount 664 * @dir: The parent directory 665 * @dentry: The name of file to be created 666 * @mode: The UNIX file mode to set 667 * @excl: True if the file must not yet exist 668 * 669 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 670 * for mknod(2). 671 * 672 */ 673 674 static int 675 v9fs_vfs_create(struct mnt_idmap *idmap, struct inode *dir, 676 struct dentry *dentry, umode_t mode, bool excl) 677 { 678 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 679 u32 perm = unixmode2p9mode(v9ses, mode); 680 struct p9_fid *fid; 681 682 /* P9_OEXCL? */ 683 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 684 if (IS_ERR(fid)) 685 return PTR_ERR(fid); 686 687 v9fs_invalidate_inode_attr(dir); 688 p9_fid_put(fid); 689 690 return 0; 691 } 692 693 /** 694 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 695 * @idmap: idmap of the mount 696 * @dir: inode that is being unlinked 697 * @dentry: dentry that is being unlinked 698 * @mode: mode for new directory 699 * 700 */ 701 702 static int v9fs_vfs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 703 struct dentry *dentry, umode_t mode) 704 { 705 int err; 706 u32 perm; 707 struct p9_fid *fid; 708 struct v9fs_session_info *v9ses; 709 710 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 711 err = 0; 712 v9ses = v9fs_inode2v9ses(dir); 713 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 714 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 715 if (IS_ERR(fid)) { 716 err = PTR_ERR(fid); 717 fid = NULL; 718 } else { 719 inc_nlink(dir); 720 v9fs_invalidate_inode_attr(dir); 721 } 722 723 if (fid) 724 p9_fid_put(fid); 725 726 return err; 727 } 728 729 /** 730 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 731 * @dir: inode that is being walked from 732 * @dentry: dentry that is being walked to? 733 * @flags: lookup flags (unused) 734 * 735 */ 736 737 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 738 unsigned int flags) 739 { 740 struct dentry *res; 741 struct v9fs_session_info *v9ses; 742 struct p9_fid *dfid, *fid; 743 struct inode *inode; 744 const unsigned char *name; 745 746 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 747 dir, dentry, dentry, flags); 748 749 if (dentry->d_name.len > NAME_MAX) 750 return ERR_PTR(-ENAMETOOLONG); 751 752 v9ses = v9fs_inode2v9ses(dir); 753 /* We can walk d_parent because we hold the dir->i_mutex */ 754 dfid = v9fs_parent_fid(dentry); 755 if (IS_ERR(dfid)) 756 return ERR_CAST(dfid); 757 758 /* 759 * Make sure we don't use a wrong inode due to parallel 760 * unlink. For cached mode create calls request for new 761 * inode. But with cache disabled, lookup should do this. 762 */ 763 name = dentry->d_name.name; 764 fid = p9_client_walk(dfid, 1, &name, 1); 765 p9_fid_put(dfid); 766 if (fid == ERR_PTR(-ENOENT)) 767 inode = NULL; 768 else if (IS_ERR(fid)) 769 inode = ERR_CAST(fid); 770 else if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) 771 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 772 else 773 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 774 /* 775 * If we had a rename on the server and a parallel lookup 776 * for the new name, then make sure we instantiate with 777 * the new name. ie look up for a/b, while on server somebody 778 * moved b under k and client parallely did a lookup for 779 * k/b. 780 */ 781 res = d_splice_alias(inode, dentry); 782 if (!IS_ERR(fid)) { 783 if (!res) 784 v9fs_fid_add(dentry, &fid); 785 else if (!IS_ERR(res)) 786 v9fs_fid_add(res, &fid); 787 else 788 p9_fid_put(fid); 789 } 790 return res; 791 } 792 793 static int 794 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 795 struct file *file, unsigned int flags, umode_t mode) 796 { 797 int err; 798 u32 perm; 799 struct v9fs_inode __maybe_unused *v9inode; 800 struct v9fs_session_info *v9ses; 801 struct p9_fid *fid; 802 struct dentry *res = NULL; 803 struct inode *inode; 804 int p9_omode; 805 806 if (d_in_lookup(dentry)) { 807 res = v9fs_vfs_lookup(dir, dentry, 0); 808 if (IS_ERR(res)) 809 return PTR_ERR(res); 810 811 if (res) 812 dentry = res; 813 } 814 815 /* Only creates */ 816 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 817 return finish_no_open(file, res); 818 819 v9ses = v9fs_inode2v9ses(dir); 820 perm = unixmode2p9mode(v9ses, mode); 821 p9_omode = v9fs_uflags2omode(flags, v9fs_proto_dotu(v9ses)); 822 823 if ((v9ses->cache & CACHE_WRITEBACK) && (p9_omode & P9_OWRITE)) { 824 p9_omode = (p9_omode & ~P9_OWRITE) | P9_ORDWR; 825 p9_debug(P9_DEBUG_CACHE, 826 "write-only file with writeback enabled, creating w/ O_RDWR\n"); 827 } 828 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, p9_omode); 829 if (IS_ERR(fid)) { 830 err = PTR_ERR(fid); 831 goto error; 832 } 833 834 v9fs_invalidate_inode_attr(dir); 835 inode = d_inode(dentry); 836 v9inode = V9FS_I(inode); 837 err = finish_open(file, dentry, generic_file_open); 838 if (err) 839 goto error; 840 841 file->private_data = fid; 842 #ifdef CONFIG_9P_FSCACHE 843 if (v9ses->cache & CACHE_FSCACHE) 844 fscache_use_cookie(v9fs_inode_cookie(v9inode), 845 file->f_mode & FMODE_WRITE); 846 #endif 847 848 v9fs_fid_add_modes(fid, v9ses->flags, v9ses->cache, file->f_flags); 849 v9fs_open_fid_add(inode, &fid); 850 851 file->f_mode |= FMODE_CREATED; 852 out: 853 dput(res); 854 return err; 855 856 error: 857 p9_fid_put(fid); 858 goto out; 859 } 860 861 /** 862 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 863 * @i: inode that is being unlinked 864 * @d: dentry that is being unlinked 865 * 866 */ 867 868 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 869 { 870 return v9fs_remove(i, d, 0); 871 } 872 873 /** 874 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 875 * @i: inode that is being unlinked 876 * @d: dentry that is being unlinked 877 * 878 */ 879 880 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 881 { 882 return v9fs_remove(i, d, AT_REMOVEDIR); 883 } 884 885 /** 886 * v9fs_vfs_rename - VFS hook to rename an inode 887 * @idmap: The idmap of the mount 888 * @old_dir: old dir inode 889 * @old_dentry: old dentry 890 * @new_dir: new dir inode 891 * @new_dentry: new dentry 892 * @flags: RENAME_* flags 893 * 894 */ 895 896 int 897 v9fs_vfs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 898 struct dentry *old_dentry, struct inode *new_dir, 899 struct dentry *new_dentry, unsigned int flags) 900 { 901 int retval; 902 struct inode *old_inode; 903 struct inode *new_inode; 904 struct v9fs_session_info *v9ses; 905 struct p9_fid *oldfid = NULL, *dfid = NULL; 906 struct p9_fid *olddirfid = NULL; 907 struct p9_fid *newdirfid = NULL; 908 struct p9_wstat wstat; 909 910 if (flags) 911 return -EINVAL; 912 913 p9_debug(P9_DEBUG_VFS, "\n"); 914 old_inode = d_inode(old_dentry); 915 new_inode = d_inode(new_dentry); 916 v9ses = v9fs_inode2v9ses(old_inode); 917 oldfid = v9fs_fid_lookup(old_dentry); 918 if (IS_ERR(oldfid)) 919 return PTR_ERR(oldfid); 920 921 dfid = v9fs_parent_fid(old_dentry); 922 olddirfid = clone_fid(dfid); 923 p9_fid_put(dfid); 924 dfid = NULL; 925 926 if (IS_ERR(olddirfid)) { 927 retval = PTR_ERR(olddirfid); 928 goto error; 929 } 930 931 dfid = v9fs_parent_fid(new_dentry); 932 newdirfid = clone_fid(dfid); 933 p9_fid_put(dfid); 934 dfid = NULL; 935 936 if (IS_ERR(newdirfid)) { 937 retval = PTR_ERR(newdirfid); 938 goto error; 939 } 940 941 down_write(&v9ses->rename_sem); 942 if (v9fs_proto_dotl(v9ses)) { 943 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 944 newdirfid, new_dentry->d_name.name); 945 if (retval == -EOPNOTSUPP) 946 retval = p9_client_rename(oldfid, newdirfid, 947 new_dentry->d_name.name); 948 if (retval != -EOPNOTSUPP) 949 goto error_locked; 950 } 951 if (old_dentry->d_parent != new_dentry->d_parent) { 952 /* 953 * 9P .u can only handle file rename in the same directory 954 */ 955 956 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 957 retval = -EXDEV; 958 goto error_locked; 959 } 960 v9fs_blank_wstat(&wstat); 961 wstat.muid = v9ses->uname; 962 wstat.name = new_dentry->d_name.name; 963 retval = p9_client_wstat(oldfid, &wstat); 964 965 error_locked: 966 if (!retval) { 967 if (new_inode) { 968 if (S_ISDIR(new_inode->i_mode)) 969 clear_nlink(new_inode); 970 else 971 v9fs_dec_count(new_inode); 972 } 973 if (S_ISDIR(old_inode->i_mode)) { 974 if (!new_inode) 975 inc_nlink(new_dir); 976 v9fs_dec_count(old_dir); 977 } 978 v9fs_invalidate_inode_attr(old_inode); 979 v9fs_invalidate_inode_attr(old_dir); 980 v9fs_invalidate_inode_attr(new_dir); 981 982 /* successful rename */ 983 d_move(old_dentry, new_dentry); 984 } 985 up_write(&v9ses->rename_sem); 986 987 error: 988 p9_fid_put(newdirfid); 989 p9_fid_put(olddirfid); 990 p9_fid_put(oldfid); 991 return retval; 992 } 993 994 /** 995 * v9fs_vfs_getattr - retrieve file metadata 996 * @idmap: idmap of the mount 997 * @path: Object to query 998 * @stat: metadata structure to populate 999 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 1000 * @flags: AT_STATX_xxx setting 1001 * 1002 */ 1003 1004 static int 1005 v9fs_vfs_getattr(struct mnt_idmap *idmap, const struct path *path, 1006 struct kstat *stat, u32 request_mask, unsigned int flags) 1007 { 1008 struct dentry *dentry = path->dentry; 1009 struct inode *inode = d_inode(dentry); 1010 struct v9fs_session_info *v9ses; 1011 struct p9_fid *fid; 1012 struct p9_wstat *st; 1013 1014 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1015 v9ses = v9fs_dentry2v9ses(dentry); 1016 if (v9ses->cache & (CACHE_META|CACHE_LOOSE)) { 1017 generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat); 1018 return 0; 1019 } else if (v9ses->cache & CACHE_WRITEBACK) { 1020 if (S_ISREG(inode->i_mode)) { 1021 int retval = filemap_fdatawrite(inode->i_mapping); 1022 1023 if (retval) 1024 p9_debug(P9_DEBUG_ERROR, 1025 "flushing writeback during getattr returned %d\n", retval); 1026 } 1027 } 1028 fid = v9fs_fid_lookup(dentry); 1029 if (IS_ERR(fid)) 1030 return PTR_ERR(fid); 1031 1032 st = p9_client_stat(fid); 1033 p9_fid_put(fid); 1034 if (IS_ERR(st)) 1035 return PTR_ERR(st); 1036 1037 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1038 generic_fillattr(&nop_mnt_idmap, request_mask, d_inode(dentry), stat); 1039 1040 p9stat_free(st); 1041 kfree(st); 1042 return 0; 1043 } 1044 1045 /** 1046 * v9fs_vfs_setattr - set file metadata 1047 * @idmap: idmap of the mount 1048 * @dentry: file whose metadata to set 1049 * @iattr: metadata assignment structure 1050 * 1051 */ 1052 1053 static int v9fs_vfs_setattr(struct mnt_idmap *idmap, 1054 struct dentry *dentry, struct iattr *iattr) 1055 { 1056 int retval, use_dentry = 0; 1057 struct inode *inode = d_inode(dentry); 1058 struct v9fs_session_info *v9ses; 1059 struct p9_fid *fid = NULL; 1060 struct p9_wstat wstat; 1061 1062 p9_debug(P9_DEBUG_VFS, "\n"); 1063 retval = setattr_prepare(&nop_mnt_idmap, dentry, iattr); 1064 if (retval) 1065 return retval; 1066 1067 v9ses = v9fs_dentry2v9ses(dentry); 1068 if (iattr->ia_valid & ATTR_FILE) { 1069 fid = iattr->ia_file->private_data; 1070 WARN_ON(!fid); 1071 } 1072 if (!fid) { 1073 fid = v9fs_fid_lookup(dentry); 1074 use_dentry = 1; 1075 } 1076 if (IS_ERR(fid)) 1077 return PTR_ERR(fid); 1078 1079 v9fs_blank_wstat(&wstat); 1080 if (iattr->ia_valid & ATTR_MODE) 1081 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1082 1083 if (iattr->ia_valid & ATTR_MTIME) 1084 wstat.mtime = iattr->ia_mtime.tv_sec; 1085 1086 if (iattr->ia_valid & ATTR_ATIME) 1087 wstat.atime = iattr->ia_atime.tv_sec; 1088 1089 if (iattr->ia_valid & ATTR_SIZE) 1090 wstat.length = iattr->ia_size; 1091 1092 if (v9fs_proto_dotu(v9ses)) { 1093 if (iattr->ia_valid & ATTR_UID) 1094 wstat.n_uid = iattr->ia_uid; 1095 1096 if (iattr->ia_valid & ATTR_GID) 1097 wstat.n_gid = iattr->ia_gid; 1098 } 1099 1100 /* Write all dirty data */ 1101 if (d_is_reg(dentry)) { 1102 retval = filemap_fdatawrite(inode->i_mapping); 1103 if (retval) 1104 p9_debug(P9_DEBUG_ERROR, 1105 "flushing writeback during setattr returned %d\n", retval); 1106 } 1107 1108 retval = p9_client_wstat(fid, &wstat); 1109 1110 if (use_dentry) 1111 p9_fid_put(fid); 1112 1113 if (retval < 0) 1114 return retval; 1115 1116 if ((iattr->ia_valid & ATTR_SIZE) && 1117 iattr->ia_size != i_size_read(inode)) { 1118 truncate_setsize(inode, iattr->ia_size); 1119 truncate_pagecache(inode, iattr->ia_size); 1120 1121 #ifdef CONFIG_9P_FSCACHE 1122 if (v9ses->cache & CACHE_FSCACHE) { 1123 struct v9fs_inode *v9inode = V9FS_I(inode); 1124 1125 fscache_resize_cookie(v9fs_inode_cookie(v9inode), iattr->ia_size); 1126 } 1127 #endif 1128 } 1129 1130 v9fs_invalidate_inode_attr(inode); 1131 1132 setattr_copy(&nop_mnt_idmap, inode, iattr); 1133 mark_inode_dirty(inode); 1134 return 0; 1135 } 1136 1137 /** 1138 * v9fs_stat2inode - populate an inode structure with mistat info 1139 * @stat: Plan 9 metadata (mistat) structure 1140 * @inode: inode to populate 1141 * @sb: superblock of filesystem 1142 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1143 * 1144 */ 1145 1146 void 1147 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1148 struct super_block *sb, unsigned int flags) 1149 { 1150 umode_t mode; 1151 struct v9fs_session_info *v9ses = sb->s_fs_info; 1152 struct v9fs_inode *v9inode = V9FS_I(inode); 1153 1154 set_nlink(inode, 1); 1155 1156 inode->i_atime.tv_sec = stat->atime; 1157 inode->i_mtime.tv_sec = stat->mtime; 1158 inode_set_ctime(inode, stat->mtime, 0); 1159 1160 inode->i_uid = v9ses->dfltuid; 1161 inode->i_gid = v9ses->dfltgid; 1162 1163 if (v9fs_proto_dotu(v9ses)) { 1164 inode->i_uid = stat->n_uid; 1165 inode->i_gid = stat->n_gid; 1166 } 1167 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1168 if (v9fs_proto_dotu(v9ses)) { 1169 unsigned int i_nlink; 1170 /* 1171 * Hadlink support got added later to the .u extension. 1172 * So there can be a server out there that doesn't 1173 * support this even with .u extension. That would 1174 * just leave us with stat->extension being an empty 1175 * string, though. 1176 */ 1177 /* HARDLINKCOUNT %u */ 1178 if (sscanf(stat->extension, 1179 " HARDLINKCOUNT %u", &i_nlink) == 1) 1180 set_nlink(inode, i_nlink); 1181 } 1182 } 1183 mode = p9mode2perm(v9ses, stat); 1184 mode |= inode->i_mode & ~S_IALLUGO; 1185 inode->i_mode = mode; 1186 1187 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1188 v9fs_i_size_write(inode, stat->length); 1189 /* not real number of blocks, but 512 byte ones ... */ 1190 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1191 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1192 } 1193 1194 /** 1195 * v9fs_qid2ino - convert qid into inode number 1196 * @qid: qid to hash 1197 * 1198 * BUG: potential for inode number collisions? 1199 */ 1200 1201 ino_t v9fs_qid2ino(struct p9_qid *qid) 1202 { 1203 u64 path = qid->path + 2; 1204 ino_t i = 0; 1205 1206 if (sizeof(ino_t) == sizeof(path)) 1207 memcpy(&i, &path, sizeof(ino_t)); 1208 else 1209 i = (ino_t) (path ^ (path >> 32)); 1210 1211 return i; 1212 } 1213 1214 /** 1215 * v9fs_vfs_get_link - follow a symlink path 1216 * @dentry: dentry for symlink 1217 * @inode: inode for symlink 1218 * @done: delayed call for when we are done with the return value 1219 */ 1220 1221 static const char *v9fs_vfs_get_link(struct dentry *dentry, 1222 struct inode *inode, 1223 struct delayed_call *done) 1224 { 1225 struct v9fs_session_info *v9ses; 1226 struct p9_fid *fid; 1227 struct p9_wstat *st; 1228 char *res; 1229 1230 if (!dentry) 1231 return ERR_PTR(-ECHILD); 1232 1233 v9ses = v9fs_dentry2v9ses(dentry); 1234 if (!v9fs_proto_dotu(v9ses)) 1235 return ERR_PTR(-EBADF); 1236 1237 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1238 fid = v9fs_fid_lookup(dentry); 1239 1240 if (IS_ERR(fid)) 1241 return ERR_CAST(fid); 1242 1243 st = p9_client_stat(fid); 1244 p9_fid_put(fid); 1245 if (IS_ERR(st)) 1246 return ERR_CAST(st); 1247 1248 if (!(st->mode & P9_DMSYMLINK)) { 1249 p9stat_free(st); 1250 kfree(st); 1251 return ERR_PTR(-EINVAL); 1252 } 1253 res = st->extension; 1254 st->extension = NULL; 1255 if (strlen(res) >= PATH_MAX) 1256 res[PATH_MAX - 1] = '\0'; 1257 1258 p9stat_free(st); 1259 kfree(st); 1260 set_delayed_call(done, kfree_link, res); 1261 return res; 1262 } 1263 1264 /** 1265 * v9fs_vfs_mkspecial - create a special file 1266 * @dir: inode to create special file in 1267 * @dentry: dentry to create 1268 * @perm: mode to create special file 1269 * @extension: 9p2000.u format extension string representing special file 1270 * 1271 */ 1272 1273 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1274 u32 perm, const char *extension) 1275 { 1276 struct p9_fid *fid; 1277 struct v9fs_session_info *v9ses; 1278 1279 v9ses = v9fs_inode2v9ses(dir); 1280 if (!v9fs_proto_dotu(v9ses)) { 1281 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1282 return -EPERM; 1283 } 1284 1285 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1286 P9_OREAD); 1287 if (IS_ERR(fid)) 1288 return PTR_ERR(fid); 1289 1290 v9fs_invalidate_inode_attr(dir); 1291 p9_fid_put(fid); 1292 return 0; 1293 } 1294 1295 /** 1296 * v9fs_vfs_symlink - helper function to create symlinks 1297 * @idmap: idmap of the mount 1298 * @dir: directory inode containing symlink 1299 * @dentry: dentry for symlink 1300 * @symname: symlink data 1301 * 1302 * See Also: 9P2000.u RFC for more information 1303 * 1304 */ 1305 1306 static int 1307 v9fs_vfs_symlink(struct mnt_idmap *idmap, struct inode *dir, 1308 struct dentry *dentry, const char *symname) 1309 { 1310 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1311 dir->i_ino, dentry, symname); 1312 1313 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1314 } 1315 1316 #define U32_MAX_DIGITS 10 1317 1318 /** 1319 * v9fs_vfs_link - create a hardlink 1320 * @old_dentry: dentry for file to link to 1321 * @dir: inode destination for new link 1322 * @dentry: dentry for link 1323 * 1324 */ 1325 1326 static int 1327 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1328 struct dentry *dentry) 1329 { 1330 int retval; 1331 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1332 struct p9_fid *oldfid; 1333 1334 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1335 dir->i_ino, dentry, old_dentry); 1336 1337 oldfid = v9fs_fid_clone(old_dentry); 1338 if (IS_ERR(oldfid)) 1339 return PTR_ERR(oldfid); 1340 1341 sprintf(name, "%d\n", oldfid->fid); 1342 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1343 if (!retval) { 1344 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1345 v9fs_invalidate_inode_attr(dir); 1346 } 1347 p9_fid_put(oldfid); 1348 return retval; 1349 } 1350 1351 /** 1352 * v9fs_vfs_mknod - create a special file 1353 * @idmap: idmap of the mount 1354 * @dir: inode destination for new link 1355 * @dentry: dentry for file 1356 * @mode: mode for creation 1357 * @rdev: device associated with special file 1358 * 1359 */ 1360 1361 static int 1362 v9fs_vfs_mknod(struct mnt_idmap *idmap, struct inode *dir, 1363 struct dentry *dentry, umode_t mode, dev_t rdev) 1364 { 1365 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1366 int retval; 1367 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1368 u32 perm; 1369 1370 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %x MAJOR: %u MINOR: %u\n", 1371 dir->i_ino, dentry, mode, 1372 MAJOR(rdev), MINOR(rdev)); 1373 1374 /* build extension */ 1375 if (S_ISBLK(mode)) 1376 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1377 else if (S_ISCHR(mode)) 1378 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1379 else 1380 *name = 0; 1381 1382 perm = unixmode2p9mode(v9ses, mode); 1383 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1384 1385 return retval; 1386 } 1387 1388 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1389 { 1390 int umode; 1391 dev_t rdev; 1392 struct p9_wstat *st; 1393 struct v9fs_session_info *v9ses; 1394 unsigned int flags; 1395 1396 v9ses = v9fs_inode2v9ses(inode); 1397 st = p9_client_stat(fid); 1398 if (IS_ERR(st)) 1399 return PTR_ERR(st); 1400 /* 1401 * Don't update inode if the file type is different 1402 */ 1403 umode = p9mode2unixmode(v9ses, st, &rdev); 1404 if (inode_wrong_type(inode, umode)) 1405 goto out; 1406 1407 /* 1408 * We don't want to refresh inode->i_size, 1409 * because we may have cached data 1410 */ 1411 flags = (v9ses->cache & CACHE_LOOSE) ? 1412 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1413 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1414 out: 1415 p9stat_free(st); 1416 kfree(st); 1417 return 0; 1418 } 1419 1420 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1421 .create = v9fs_vfs_create, 1422 .lookup = v9fs_vfs_lookup, 1423 .atomic_open = v9fs_vfs_atomic_open, 1424 .symlink = v9fs_vfs_symlink, 1425 .link = v9fs_vfs_link, 1426 .unlink = v9fs_vfs_unlink, 1427 .mkdir = v9fs_vfs_mkdir, 1428 .rmdir = v9fs_vfs_rmdir, 1429 .mknod = v9fs_vfs_mknod, 1430 .rename = v9fs_vfs_rename, 1431 .getattr = v9fs_vfs_getattr, 1432 .setattr = v9fs_vfs_setattr, 1433 }; 1434 1435 static const struct inode_operations v9fs_dir_inode_operations = { 1436 .create = v9fs_vfs_create, 1437 .lookup = v9fs_vfs_lookup, 1438 .atomic_open = v9fs_vfs_atomic_open, 1439 .unlink = v9fs_vfs_unlink, 1440 .mkdir = v9fs_vfs_mkdir, 1441 .rmdir = v9fs_vfs_rmdir, 1442 .mknod = v9fs_vfs_mknod, 1443 .rename = v9fs_vfs_rename, 1444 .getattr = v9fs_vfs_getattr, 1445 .setattr = v9fs_vfs_setattr, 1446 }; 1447 1448 static const struct inode_operations v9fs_file_inode_operations = { 1449 .getattr = v9fs_vfs_getattr, 1450 .setattr = v9fs_vfs_setattr, 1451 }; 1452 1453 static const struct inode_operations v9fs_symlink_inode_operations = { 1454 .get_link = v9fs_vfs_get_link, 1455 .getattr = v9fs_vfs_getattr, 1456 .setattr = v9fs_vfs_setattr, 1457 }; 1458 1459