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