1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * linux/fs/9p/vfs_inode.c 4 * 5 * This file contains vfs inode ops for the 9P2000 protocol. 6 * 7 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 8 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 9 */ 10 11#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 12 13#include <linux/module.h> 14#include <linux/errno.h> 15#include <linux/fs.h> 16#include <linux/file.h> 17#include <linux/pagemap.h> 18#include <linux/stat.h> 19#include <linux/string.h> 20#include <linux/inet.h> 21#include <linux/namei.h> 22#include <linux/idr.h> 23#include <linux/sched.h> 24#include <linux/slab.h> 25#include <linux/xattr.h> 26#include <linux/posix_acl.h> 27#include <net/9p/9p.h> 28#include <net/9p/client.h> 29 30#include "v9fs.h" 31#include "v9fs_vfs.h" 32#include "fid.h" 33#include "cache.h" 34#include "xattr.h" 35#include "acl.h" 36 37static const struct inode_operations v9fs_dir_inode_operations; 38static const struct inode_operations v9fs_dir_inode_operations_dotu; 39static const struct inode_operations v9fs_file_inode_operations; 40static const struct inode_operations v9fs_symlink_inode_operations; 41 42/** 43 * unixmode2p9mode - convert unix mode bits to plan 9 44 * @v9ses: v9fs session information 45 * @mode: mode to convert 46 * 47 */ 48 49static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 50{ 51 int res; 52 res = mode & 0777; 53 if (S_ISDIR(mode)) 54 res |= P9_DMDIR; 55 if (v9fs_proto_dotu(v9ses)) { 56 if (v9ses->nodev == 0) { 57 if (S_ISSOCK(mode)) 58 res |= P9_DMSOCKET; 59 if (S_ISFIFO(mode)) 60 res |= P9_DMNAMEDPIPE; 61 if (S_ISBLK(mode)) 62 res |= P9_DMDEVICE; 63 if (S_ISCHR(mode)) 64 res |= P9_DMDEVICE; 65 } 66 67 if ((mode & S_ISUID) == S_ISUID) 68 res |= P9_DMSETUID; 69 if ((mode & S_ISGID) == S_ISGID) 70 res |= P9_DMSETGID; 71 if ((mode & S_ISVTX) == S_ISVTX) 72 res |= P9_DMSETVTX; 73 } 74 return res; 75} 76 77/** 78 * p9mode2perm- convert plan9 mode bits to unix permission bits 79 * @v9ses: v9fs session information 80 * @stat: p9_wstat from which mode need to be derived 81 * 82 */ 83static int p9mode2perm(struct v9fs_session_info *v9ses, 84 struct p9_wstat *stat) 85{ 86 int res; 87 int mode = stat->mode; 88 89 res = mode & S_IALLUGO; 90 if (v9fs_proto_dotu(v9ses)) { 91 if ((mode & P9_DMSETUID) == P9_DMSETUID) 92 res |= S_ISUID; 93 94 if ((mode & P9_DMSETGID) == P9_DMSETGID) 95 res |= S_ISGID; 96 97 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 98 res |= S_ISVTX; 99 } 100 return res; 101} 102 103/** 104 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 105 * @v9ses: v9fs session information 106 * @stat: p9_wstat from which mode need to be derived 107 * @rdev: major number, minor number in case of device files. 108 * 109 */ 110static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 111 struct p9_wstat *stat, dev_t *rdev) 112{ 113 int res; 114 u32 mode = stat->mode; 115 116 *rdev = 0; 117 res = p9mode2perm(v9ses, stat); 118 119 if ((mode & P9_DMDIR) == P9_DMDIR) 120 res |= S_IFDIR; 121 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 122 res |= S_IFLNK; 123 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 124 && (v9ses->nodev == 0)) 125 res |= S_IFSOCK; 126 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 127 && (v9ses->nodev == 0)) 128 res |= S_IFIFO; 129 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 130 && (v9ses->nodev == 0)) { 131 char type = 0, ext[32]; 132 int major = -1, minor = -1; 133 134 strlcpy(ext, stat->extension, sizeof(ext)); 135 sscanf(ext, "%c %i %i", &type, &major, &minor); 136 switch (type) { 137 case 'c': 138 res |= S_IFCHR; 139 break; 140 case 'b': 141 res |= S_IFBLK; 142 break; 143 default: 144 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 145 type, stat->extension); 146 } 147 *rdev = MKDEV(major, minor); 148 } else 149 res |= S_IFREG; 150 151 return res; 152} 153 154/** 155 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 156 * @uflags: flags to convert 157 * @extended: if .u extensions are active 158 */ 159 160int v9fs_uflags2omode(int uflags, int extended) 161{ 162 int ret; 163 164 ret = 0; 165 switch (uflags&3) { 166 default: 167 case O_RDONLY: 168 ret = P9_OREAD; 169 break; 170 171 case O_WRONLY: 172 ret = P9_OWRITE; 173 break; 174 175 case O_RDWR: 176 ret = P9_ORDWR; 177 break; 178 } 179 180 if (extended) { 181 if (uflags & O_EXCL) 182 ret |= P9_OEXCL; 183 184 if (uflags & O_APPEND) 185 ret |= P9_OAPPEND; 186 } 187 188 return ret; 189} 190 191/** 192 * v9fs_blank_wstat - helper function to setup a 9P stat structure 193 * @wstat: structure to initialize 194 * 195 */ 196 197void 198v9fs_blank_wstat(struct p9_wstat *wstat) 199{ 200 wstat->type = ~0; 201 wstat->dev = ~0; 202 wstat->qid.type = ~0; 203 wstat->qid.version = ~0; 204 *((long long *)&wstat->qid.path) = ~0; 205 wstat->mode = ~0; 206 wstat->atime = ~0; 207 wstat->mtime = ~0; 208 wstat->length = ~0; 209 wstat->name = NULL; 210 wstat->uid = NULL; 211 wstat->gid = NULL; 212 wstat->muid = NULL; 213 wstat->n_uid = INVALID_UID; 214 wstat->n_gid = INVALID_GID; 215 wstat->n_muid = INVALID_UID; 216 wstat->extension = NULL; 217} 218 219/** 220 * v9fs_alloc_inode - helper function to allocate an inode 221 * 222 */ 223struct inode *v9fs_alloc_inode(struct super_block *sb) 224{ 225 struct v9fs_inode *v9inode; 226 v9inode = kmem_cache_alloc(v9fs_inode_cache, GFP_KERNEL); 227 if (!v9inode) 228 return NULL; 229#ifdef CONFIG_9P_FSCACHE 230 v9inode->fscache = NULL; 231 mutex_init(&v9inode->fscache_lock); 232#endif 233 v9inode->writeback_fid = NULL; 234 v9inode->cache_validity = 0; 235 mutex_init(&v9inode->v_mutex); 236 return &v9inode->vfs_inode; 237} 238 239/** 240 * v9fs_free_inode - destroy an inode 241 * 242 */ 243 244void v9fs_free_inode(struct inode *inode) 245{ 246 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 247} 248 249int v9fs_init_inode(struct v9fs_session_info *v9ses, 250 struct inode *inode, umode_t mode, dev_t rdev) 251{ 252 int err = 0; 253 254 inode_init_owner(inode, NULL, mode); 255 inode->i_blocks = 0; 256 inode->i_rdev = rdev; 257 inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode); 258 inode->i_mapping->a_ops = &v9fs_addr_operations; 259 260 switch (mode & S_IFMT) { 261 case S_IFIFO: 262 case S_IFBLK: 263 case S_IFCHR: 264 case S_IFSOCK: 265 if (v9fs_proto_dotl(v9ses)) { 266 inode->i_op = &v9fs_file_inode_operations_dotl; 267 } else if (v9fs_proto_dotu(v9ses)) { 268 inode->i_op = &v9fs_file_inode_operations; 269 } else { 270 p9_debug(P9_DEBUG_ERROR, 271 "special files without extended mode\n"); 272 err = -EINVAL; 273 goto error; 274 } 275 init_special_inode(inode, inode->i_mode, inode->i_rdev); 276 break; 277 case S_IFREG: 278 if (v9fs_proto_dotl(v9ses)) { 279 inode->i_op = &v9fs_file_inode_operations_dotl; 280 if (v9ses->cache == CACHE_LOOSE || 281 v9ses->cache == CACHE_FSCACHE) 282 inode->i_fop = 283 &v9fs_cached_file_operations_dotl; 284 else if (v9ses->cache == CACHE_MMAP) 285 inode->i_fop = &v9fs_mmap_file_operations_dotl; 286 else 287 inode->i_fop = &v9fs_file_operations_dotl; 288 } else { 289 inode->i_op = &v9fs_file_inode_operations; 290 if (v9ses->cache == CACHE_LOOSE || 291 v9ses->cache == CACHE_FSCACHE) 292 inode->i_fop = 293 &v9fs_cached_file_operations; 294 else if (v9ses->cache == CACHE_MMAP) 295 inode->i_fop = &v9fs_mmap_file_operations; 296 else 297 inode->i_fop = &v9fs_file_operations; 298 } 299 300 break; 301 case S_IFLNK: 302 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 303 p9_debug(P9_DEBUG_ERROR, 304 "extended modes used with legacy protocol\n"); 305 err = -EINVAL; 306 goto error; 307 } 308 309 if (v9fs_proto_dotl(v9ses)) 310 inode->i_op = &v9fs_symlink_inode_operations_dotl; 311 else 312 inode->i_op = &v9fs_symlink_inode_operations; 313 314 break; 315 case S_IFDIR: 316 inc_nlink(inode); 317 if (v9fs_proto_dotl(v9ses)) 318 inode->i_op = &v9fs_dir_inode_operations_dotl; 319 else if (v9fs_proto_dotu(v9ses)) 320 inode->i_op = &v9fs_dir_inode_operations_dotu; 321 else 322 inode->i_op = &v9fs_dir_inode_operations; 323 324 if (v9fs_proto_dotl(v9ses)) 325 inode->i_fop = &v9fs_dir_operations_dotl; 326 else 327 inode->i_fop = &v9fs_dir_operations; 328 329 break; 330 default: 331 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 332 mode, mode & S_IFMT); 333 err = -EINVAL; 334 goto error; 335 } 336error: 337 return err; 338 339} 340 341/** 342 * v9fs_get_inode - helper function to setup an inode 343 * @sb: superblock 344 * @mode: mode to setup inode with 345 * 346 */ 347 348struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 349{ 350 int err; 351 struct inode *inode; 352 struct v9fs_session_info *v9ses = sb->s_fs_info; 353 354 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 355 356 inode = new_inode(sb); 357 if (!inode) { 358 pr_warn("%s (%d): Problem allocating inode\n", 359 __func__, task_pid_nr(current)); 360 return ERR_PTR(-ENOMEM); 361 } 362 err = v9fs_init_inode(v9ses, inode, mode, rdev); 363 if (err) { 364 iput(inode); 365 return ERR_PTR(err); 366 } 367 return inode; 368} 369 370/** 371 * v9fs_clear_inode - release an inode 372 * @inode: inode to release 373 * 374 */ 375void v9fs_evict_inode(struct inode *inode) 376{ 377 struct v9fs_inode *v9inode = V9FS_I(inode); 378 379 truncate_inode_pages_final(&inode->i_data); 380 clear_inode(inode); 381 filemap_fdatawrite(&inode->i_data); 382 383 v9fs_cache_inode_put_cookie(inode); 384 /* clunk the fid stashed in writeback_fid */ 385 if (v9inode->writeback_fid) { 386 p9_client_clunk(v9inode->writeback_fid); 387 v9inode->writeback_fid = NULL; 388 } 389} 390 391static int v9fs_test_inode(struct inode *inode, void *data) 392{ 393 int umode; 394 dev_t rdev; 395 struct v9fs_inode *v9inode = V9FS_I(inode); 396 struct p9_wstat *st = (struct p9_wstat *)data; 397 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 398 399 umode = p9mode2unixmode(v9ses, st, &rdev); 400 /* don't match inode of different type */ 401 if (inode_wrong_type(inode, umode)) 402 return 0; 403 404 /* compare qid details */ 405 if (memcmp(&v9inode->qid.version, 406 &st->qid.version, sizeof(v9inode->qid.version))) 407 return 0; 408 409 if (v9inode->qid.type != st->qid.type) 410 return 0; 411 412 if (v9inode->qid.path != st->qid.path) 413 return 0; 414 return 1; 415} 416 417static int v9fs_test_new_inode(struct inode *inode, void *data) 418{ 419 return 0; 420} 421 422static int v9fs_set_inode(struct inode *inode, void *data) 423{ 424 struct v9fs_inode *v9inode = V9FS_I(inode); 425 struct p9_wstat *st = (struct p9_wstat *)data; 426 427 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 428 return 0; 429} 430 431static struct inode *v9fs_qid_iget(struct super_block *sb, 432 struct p9_qid *qid, 433 struct p9_wstat *st, 434 int new) 435{ 436 dev_t rdev; 437 int retval; 438 umode_t umode; 439 unsigned long i_ino; 440 struct inode *inode; 441 struct v9fs_session_info *v9ses = sb->s_fs_info; 442 int (*test)(struct inode *, void *); 443 444 if (new) 445 test = v9fs_test_new_inode; 446 else 447 test = v9fs_test_inode; 448 449 i_ino = v9fs_qid2ino(qid); 450 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 451 if (!inode) 452 return ERR_PTR(-ENOMEM); 453 if (!(inode->i_state & I_NEW)) 454 return inode; 455 /* 456 * initialize the inode with the stat info 457 * FIXME!! we may need support for stale inodes 458 * later. 459 */ 460 inode->i_ino = i_ino; 461 umode = p9mode2unixmode(v9ses, st, &rdev); 462 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 463 if (retval) 464 goto error; 465 466 v9fs_stat2inode(st, inode, sb, 0); 467 v9fs_cache_inode_get_cookie(inode); 468 unlock_new_inode(inode); 469 return inode; 470error: 471 iget_failed(inode); 472 return ERR_PTR(retval); 473 474} 475 476struct inode * 477v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 478 struct super_block *sb, int new) 479{ 480 struct p9_wstat *st; 481 struct inode *inode = NULL; 482 483 st = p9_client_stat(fid); 484 if (IS_ERR(st)) 485 return ERR_CAST(st); 486 487 inode = v9fs_qid_iget(sb, &st->qid, st, new); 488 p9stat_free(st); 489 kfree(st); 490 return inode; 491} 492 493/** 494 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 495 * plan 9 AT flag. 496 * @flags: flags to convert 497 */ 498static int v9fs_at_to_dotl_flags(int flags) 499{ 500 int rflags = 0; 501 if (flags & AT_REMOVEDIR) 502 rflags |= P9_DOTL_AT_REMOVEDIR; 503 return rflags; 504} 505 506/** 507 * v9fs_dec_count - helper functon to drop i_nlink. 508 * 509 * If a directory had nlink <= 2 (including . and ..), then we should not drop 510 * the link count, which indicates the underlying exported fs doesn't maintain 511 * nlink accurately. e.g. 512 * - overlayfs sets nlink to 1 for merged dir 513 * - ext4 (with dir_nlink feature enabled) sets nlink to 1 if a dir has more 514 * than EXT4_LINK_MAX (65000) links. 515 * 516 * @inode: inode whose nlink is being dropped 517 */ 518static void v9fs_dec_count(struct inode *inode) 519{ 520 if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2) 521 drop_nlink(inode); 522} 523 524/** 525 * v9fs_remove - helper function to remove files and directories 526 * @dir: directory inode that is being deleted 527 * @dentry: dentry that is being deleted 528 * @flags: removing a directory 529 * 530 */ 531 532static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 533{ 534 struct inode *inode; 535 int retval = -EOPNOTSUPP; 536 struct p9_fid *v9fid, *dfid; 537 struct v9fs_session_info *v9ses; 538 539 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 540 dir, dentry, flags); 541 542 v9ses = v9fs_inode2v9ses(dir); 543 inode = d_inode(dentry); 544 dfid = v9fs_parent_fid(dentry); 545 if (IS_ERR(dfid)) { 546 retval = PTR_ERR(dfid); 547 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 548 return retval; 549 } 550 if (v9fs_proto_dotl(v9ses)) 551 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 552 v9fs_at_to_dotl_flags(flags)); 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 return retval; 575} 576 577/** 578 * v9fs_create - Create a file 579 * @v9ses: session information 580 * @dir: directory that dentry is being created in 581 * @dentry: dentry that is being created 582 * @extension: 9p2000.u extension string to support devices, etc. 583 * @perm: create permissions 584 * @mode: open mode 585 * 586 */ 587static struct p9_fid * 588v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 589 struct dentry *dentry, char *extension, u32 perm, u8 mode) 590{ 591 int err; 592 const unsigned char *name; 593 struct p9_fid *dfid, *ofid, *fid; 594 struct inode *inode; 595 596 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 597 598 err = 0; 599 ofid = NULL; 600 fid = NULL; 601 name = dentry->d_name.name; 602 dfid = v9fs_parent_fid(dentry); 603 if (IS_ERR(dfid)) { 604 err = PTR_ERR(dfid); 605 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 606 return ERR_PTR(err); 607 } 608 609 /* clone a fid to use for creation */ 610 ofid = clone_fid(dfid); 611 if (IS_ERR(ofid)) { 612 err = PTR_ERR(ofid); 613 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 614 return ERR_PTR(err); 615 } 616 617 err = p9_client_fcreate(ofid, name, perm, mode, extension); 618 if (err < 0) { 619 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 620 goto error; 621 } 622 623 if (!(perm & P9_DMLINK)) { 624 /* now walk from the parent so we can get unopened fid */ 625 fid = p9_client_walk(dfid, 1, &name, 1); 626 if (IS_ERR(fid)) { 627 err = PTR_ERR(fid); 628 p9_debug(P9_DEBUG_VFS, 629 "p9_client_walk failed %d\n", err); 630 fid = NULL; 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 return ofid; 647error: 648 if (ofid) 649 p9_client_clunk(ofid); 650 651 if (fid) 652 p9_client_clunk(fid); 653 654 return ERR_PTR(err); 655} 656 657/** 658 * v9fs_vfs_create - VFS hook to create a regular file 659 * 660 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 661 * for mknod(2). 662 * 663 * @dir: directory inode that is being created 664 * @dentry: dentry that is being deleted 665 * @mode: create permissions 666 * 667 */ 668 669static int 670v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 671 bool excl) 672{ 673 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 674 u32 perm = unixmode2p9mode(v9ses, mode); 675 struct p9_fid *fid; 676 677 /* P9_OEXCL? */ 678 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 679 if (IS_ERR(fid)) 680 return PTR_ERR(fid); 681 682 v9fs_invalidate_inode_attr(dir); 683 p9_client_clunk(fid); 684 685 return 0; 686} 687 688/** 689 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 690 * @dir: inode that is being unlinked 691 * @dentry: dentry that is being unlinked 692 * @mode: mode for new directory 693 * 694 */ 695 696static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 697{ 698 int err; 699 u32 perm; 700 struct p9_fid *fid; 701 struct v9fs_session_info *v9ses; 702 703 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 704 err = 0; 705 v9ses = v9fs_inode2v9ses(dir); 706 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 707 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 708 if (IS_ERR(fid)) { 709 err = PTR_ERR(fid); 710 fid = NULL; 711 } else { 712 inc_nlink(dir); 713 v9fs_invalidate_inode_attr(dir); 714 } 715 716 if (fid) 717 p9_client_clunk(fid); 718 719 return err; 720} 721 722/** 723 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 724 * @dir: inode that is being walked from 725 * @dentry: dentry that is being walked to? 726 * @flags: lookup flags (unused) 727 * 728 */ 729 730struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 731 unsigned int flags) 732{ 733 struct dentry *res; 734 struct v9fs_session_info *v9ses; 735 struct p9_fid *dfid, *fid; 736 struct inode *inode; 737 const unsigned char *name; 738 739 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 740 dir, dentry, dentry, flags); 741 742 if (dentry->d_name.len > NAME_MAX) 743 return ERR_PTR(-ENAMETOOLONG); 744 745 v9ses = v9fs_inode2v9ses(dir); 746 /* We can walk d_parent because we hold the dir->i_mutex */ 747 dfid = v9fs_parent_fid(dentry); 748 if (IS_ERR(dfid)) 749 return ERR_CAST(dfid); 750 751 /* 752 * Make sure we don't use a wrong inode due to parallel 753 * unlink. For cached mode create calls request for new 754 * inode. But with cache disabled, lookup should do this. 755 */ 756 name = dentry->d_name.name; 757 fid = p9_client_walk(dfid, 1, &name, 1); 758 if (fid == ERR_PTR(-ENOENT)) 759 inode = NULL; 760 else if (IS_ERR(fid)) 761 inode = ERR_CAST(fid); 762 else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 763 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 764 else 765 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 766 /* 767 * If we had a rename on the server and a parallel lookup 768 * for the new name, then make sure we instantiate with 769 * the new name. ie look up for a/b, while on server somebody 770 * moved b under k and client parallely did a lookup for 771 * k/b. 772 */ 773 res = d_splice_alias(inode, dentry); 774 if (!IS_ERR(fid)) { 775 if (!res) 776 v9fs_fid_add(dentry, fid); 777 else if (!IS_ERR(res)) 778 v9fs_fid_add(res, fid); 779 else 780 p9_client_clunk(fid); 781 } 782 return res; 783} 784 785static int 786v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 787 struct file *file, unsigned flags, umode_t mode) 788{ 789 int err; 790 u32 perm; 791 struct v9fs_inode *v9inode; 792 struct v9fs_session_info *v9ses; 793 struct p9_fid *fid, *inode_fid; 794 struct dentry *res = NULL; 795 796 if (d_in_lookup(dentry)) { 797 res = v9fs_vfs_lookup(dir, dentry, 0); 798 if (IS_ERR(res)) 799 return PTR_ERR(res); 800 801 if (res) 802 dentry = res; 803 } 804 805 /* Only creates */ 806 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 807 return finish_no_open(file, res); 808 809 err = 0; 810 811 v9ses = v9fs_inode2v9ses(dir); 812 perm = unixmode2p9mode(v9ses, mode); 813 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 814 v9fs_uflags2omode(flags, 815 v9fs_proto_dotu(v9ses))); 816 if (IS_ERR(fid)) { 817 err = PTR_ERR(fid); 818 fid = NULL; 819 goto error; 820 } 821 822 v9fs_invalidate_inode_attr(dir); 823 v9inode = V9FS_I(d_inode(dentry)); 824 mutex_lock(&v9inode->v_mutex); 825 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 826 !v9inode->writeback_fid && 827 ((flags & O_ACCMODE) != O_RDONLY)) { 828 /* 829 * clone a fid and add it to writeback_fid 830 * we do it during open time instead of 831 * page dirty time via write_begin/page_mkwrite 832 * because we want write after unlink usecase 833 * to work. 834 */ 835 inode_fid = v9fs_writeback_fid(dentry); 836 if (IS_ERR(inode_fid)) { 837 err = PTR_ERR(inode_fid); 838 mutex_unlock(&v9inode->v_mutex); 839 goto error; 840 } 841 v9inode->writeback_fid = (void *) inode_fid; 842 } 843 mutex_unlock(&v9inode->v_mutex); 844 err = finish_open(file, dentry, generic_file_open); 845 if (err) 846 goto error; 847 848 file->private_data = fid; 849 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 850 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 851 852 file->f_mode |= FMODE_CREATED; 853out: 854 dput(res); 855 return err; 856 857error: 858 if (fid) 859 p9_client_clunk(fid); 860 goto out; 861} 862 863/** 864 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 865 * @i: inode that is being unlinked 866 * @d: dentry that is being unlinked 867 * 868 */ 869 870int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 871{ 872 return v9fs_remove(i, d, 0); 873} 874 875/** 876 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 877 * @i: inode that is being unlinked 878 * @d: dentry that is being unlinked 879 * 880 */ 881 882int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 883{ 884 return v9fs_remove(i, d, AT_REMOVEDIR); 885} 886 887/** 888 * v9fs_vfs_rename - VFS hook to rename an inode 889 * @old_dir: old dir inode 890 * @old_dentry: old dentry 891 * @new_dir: new dir inode 892 * @new_dentry: new dentry 893 * 894 */ 895 896int 897v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 898 struct inode *new_dir, struct dentry *new_dentry, 899 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; 906 struct p9_fid *olddirfid; 907 struct p9_fid *newdirfid; 908 struct p9_wstat wstat; 909 910 if (flags) 911 return -EINVAL; 912 913 p9_debug(P9_DEBUG_VFS, "\n"); 914 retval = 0; 915 old_inode = d_inode(old_dentry); 916 new_inode = d_inode(new_dentry); 917 v9ses = v9fs_inode2v9ses(old_inode); 918 oldfid = v9fs_fid_lookup(old_dentry); 919 if (IS_ERR(oldfid)) 920 return PTR_ERR(oldfid); 921 922 olddirfid = clone_fid(v9fs_parent_fid(old_dentry)); 923 if (IS_ERR(olddirfid)) { 924 retval = PTR_ERR(olddirfid); 925 goto done; 926 } 927 928 newdirfid = clone_fid(v9fs_parent_fid(new_dentry)); 929 if (IS_ERR(newdirfid)) { 930 retval = PTR_ERR(newdirfid); 931 goto clunk_olddir; 932 } 933 934 down_write(&v9ses->rename_sem); 935 if (v9fs_proto_dotl(v9ses)) { 936 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 937 newdirfid, new_dentry->d_name.name); 938 if (retval == -EOPNOTSUPP) 939 retval = p9_client_rename(oldfid, newdirfid, 940 new_dentry->d_name.name); 941 if (retval != -EOPNOTSUPP) 942 goto clunk_newdir; 943 } 944 if (old_dentry->d_parent != new_dentry->d_parent) { 945 /* 946 * 9P .u can only handle file rename in the same directory 947 */ 948 949 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 950 retval = -EXDEV; 951 goto clunk_newdir; 952 } 953 v9fs_blank_wstat(&wstat); 954 wstat.muid = v9ses->uname; 955 wstat.name = new_dentry->d_name.name; 956 retval = p9_client_wstat(oldfid, &wstat); 957 958clunk_newdir: 959 if (!retval) { 960 if (new_inode) { 961 if (S_ISDIR(new_inode->i_mode)) 962 clear_nlink(new_inode); 963 else 964 v9fs_dec_count(new_inode); 965 } 966 if (S_ISDIR(old_inode->i_mode)) { 967 if (!new_inode) 968 inc_nlink(new_dir); 969 v9fs_dec_count(old_dir); 970 } 971 v9fs_invalidate_inode_attr(old_inode); 972 v9fs_invalidate_inode_attr(old_dir); 973 v9fs_invalidate_inode_attr(new_dir); 974 975 /* successful rename */ 976 d_move(old_dentry, new_dentry); 977 } 978 up_write(&v9ses->rename_sem); 979 p9_client_clunk(newdirfid); 980 981clunk_olddir: 982 p9_client_clunk(olddirfid); 983 984done: 985 return retval; 986} 987 988/** 989 * v9fs_vfs_getattr - retrieve file metadata 990 * @path: Object to query 991 * @stat: metadata structure to populate 992 * @request_mask: Mask of STATX_xxx flags indicating the caller's interests 993 * @flags: AT_STATX_xxx setting 994 * 995 */ 996 997static int 998v9fs_vfs_getattr(const struct path *path, struct kstat *stat, 999 u32 request_mask, unsigned int flags) 1000{ 1001 struct dentry *dentry = path->dentry; 1002 struct v9fs_session_info *v9ses; 1003 struct p9_fid *fid; 1004 struct p9_wstat *st; 1005 1006 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1007 v9ses = v9fs_dentry2v9ses(dentry); 1008 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1009 generic_fillattr(d_inode(dentry), stat); 1010 return 0; 1011 } 1012 fid = v9fs_fid_lookup(dentry); 1013 if (IS_ERR(fid)) 1014 return PTR_ERR(fid); 1015 1016 st = p9_client_stat(fid); 1017 if (IS_ERR(st)) 1018 return PTR_ERR(st); 1019 1020 v9fs_stat2inode(st, d_inode(dentry), dentry->d_sb, 0); 1021 generic_fillattr(d_inode(dentry), stat); 1022 1023 p9stat_free(st); 1024 kfree(st); 1025 return 0; 1026} 1027 1028/** 1029 * v9fs_vfs_setattr - set file metadata 1030 * @dentry: file whose metadata to set 1031 * @iattr: metadata assignment structure 1032 * 1033 */ 1034 1035static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1036{ 1037 int retval; 1038 struct v9fs_session_info *v9ses; 1039 struct p9_fid *fid = NULL; 1040 struct p9_wstat wstat; 1041 1042 p9_debug(P9_DEBUG_VFS, "\n"); 1043 retval = setattr_prepare(dentry, iattr); 1044 if (retval) 1045 return retval; 1046 1047 retval = -EPERM; 1048 v9ses = v9fs_dentry2v9ses(dentry); 1049 if (iattr->ia_valid & ATTR_FILE) { 1050 fid = iattr->ia_file->private_data; 1051 WARN_ON(!fid); 1052 } 1053 if (!fid) 1054 fid = v9fs_fid_lookup(dentry); 1055 if(IS_ERR(fid)) 1056 return PTR_ERR(fid); 1057 1058 v9fs_blank_wstat(&wstat); 1059 if (iattr->ia_valid & ATTR_MODE) 1060 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1061 1062 if (iattr->ia_valid & ATTR_MTIME) 1063 wstat.mtime = iattr->ia_mtime.tv_sec; 1064 1065 if (iattr->ia_valid & ATTR_ATIME) 1066 wstat.atime = iattr->ia_atime.tv_sec; 1067 1068 if (iattr->ia_valid & ATTR_SIZE) 1069 wstat.length = iattr->ia_size; 1070 1071 if (v9fs_proto_dotu(v9ses)) { 1072 if (iattr->ia_valid & ATTR_UID) 1073 wstat.n_uid = iattr->ia_uid; 1074 1075 if (iattr->ia_valid & ATTR_GID) 1076 wstat.n_gid = iattr->ia_gid; 1077 } 1078 1079 /* Write all dirty data */ 1080 if (d_is_reg(dentry)) 1081 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1082 1083 retval = p9_client_wstat(fid, &wstat); 1084 if (retval < 0) 1085 return retval; 1086 1087 if ((iattr->ia_valid & ATTR_SIZE) && 1088 iattr->ia_size != i_size_read(d_inode(dentry))) 1089 truncate_setsize(d_inode(dentry), iattr->ia_size); 1090 1091 v9fs_invalidate_inode_attr(d_inode(dentry)); 1092 1093 setattr_copy(d_inode(dentry), iattr); 1094 mark_inode_dirty(d_inode(dentry)); 1095 return 0; 1096} 1097 1098/** 1099 * v9fs_stat2inode - populate an inode structure with mistat info 1100 * @stat: Plan 9 metadata (mistat) structure 1101 * @inode: inode to populate 1102 * @sb: superblock of filesystem 1103 * @flags: control flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE) 1104 * 1105 */ 1106 1107void 1108v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1109 struct super_block *sb, unsigned int flags) 1110{ 1111 umode_t mode; 1112 char ext[32]; 1113 char tag_name[14]; 1114 unsigned int i_nlink; 1115 struct v9fs_session_info *v9ses = sb->s_fs_info; 1116 struct v9fs_inode *v9inode = V9FS_I(inode); 1117 1118 set_nlink(inode, 1); 1119 1120 inode->i_atime.tv_sec = stat->atime; 1121 inode->i_mtime.tv_sec = stat->mtime; 1122 inode->i_ctime.tv_sec = stat->mtime; 1123 1124 inode->i_uid = v9ses->dfltuid; 1125 inode->i_gid = v9ses->dfltgid; 1126 1127 if (v9fs_proto_dotu(v9ses)) { 1128 inode->i_uid = stat->n_uid; 1129 inode->i_gid = stat->n_gid; 1130 } 1131 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1132 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1133 /* 1134 * Hadlink support got added later to 1135 * to the .u extension. So there can be 1136 * server out there that doesn't support 1137 * this even with .u extension. So check 1138 * for non NULL stat->extension 1139 */ 1140 strlcpy(ext, stat->extension, sizeof(ext)); 1141 /* HARDLINKCOUNT %u */ 1142 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1143 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1144 set_nlink(inode, i_nlink); 1145 } 1146 } 1147 mode = p9mode2perm(v9ses, stat); 1148 mode |= inode->i_mode & ~S_IALLUGO; 1149 inode->i_mode = mode; 1150 1151 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE)) 1152 v9fs_i_size_write(inode, stat->length); 1153 /* not real number of blocks, but 512 byte ones ... */ 1154 inode->i_blocks = (stat->length + 512 - 1) >> 9; 1155 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1156} 1157 1158/** 1159 * v9fs_qid2ino - convert qid into inode number 1160 * @qid: qid to hash 1161 * 1162 * BUG: potential for inode number collisions? 1163 */ 1164 1165ino_t v9fs_qid2ino(struct p9_qid *qid) 1166{ 1167 u64 path = qid->path + 2; 1168 ino_t i = 0; 1169 1170 if (sizeof(ino_t) == sizeof(path)) 1171 memcpy(&i, &path, sizeof(ino_t)); 1172 else 1173 i = (ino_t) (path ^ (path >> 32)); 1174 1175 return i; 1176} 1177 1178/** 1179 * v9fs_vfs_get_link - follow a symlink path 1180 * @dentry: dentry for symlink 1181 * @inode: inode for symlink 1182 * @done: delayed call for when we are done with the return value 1183 */ 1184 1185static const char *v9fs_vfs_get_link(struct dentry *dentry, 1186 struct inode *inode, 1187 struct delayed_call *done) 1188{ 1189 struct v9fs_session_info *v9ses; 1190 struct p9_fid *fid; 1191 struct p9_wstat *st; 1192 char *res; 1193 1194 if (!dentry) 1195 return ERR_PTR(-ECHILD); 1196 1197 v9ses = v9fs_dentry2v9ses(dentry); 1198 fid = v9fs_fid_lookup(dentry); 1199 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1200 1201 if (IS_ERR(fid)) 1202 return ERR_CAST(fid); 1203 1204 if (!v9fs_proto_dotu(v9ses)) 1205 return ERR_PTR(-EBADF); 1206 1207 st = p9_client_stat(fid); 1208 if (IS_ERR(st)) 1209 return ERR_CAST(st); 1210 1211 if (!(st->mode & P9_DMSYMLINK)) { 1212 p9stat_free(st); 1213 kfree(st); 1214 return ERR_PTR(-EINVAL); 1215 } 1216 res = st->extension; 1217 st->extension = NULL; 1218 if (strlen(res) >= PATH_MAX) 1219 res[PATH_MAX - 1] = '\0'; 1220 1221 p9stat_free(st); 1222 kfree(st); 1223 set_delayed_call(done, kfree_link, res); 1224 return res; 1225} 1226 1227/** 1228 * v9fs_vfs_mkspecial - create a special file 1229 * @dir: inode to create special file in 1230 * @dentry: dentry to create 1231 * @perm: mode to create special file 1232 * @extension: 9p2000.u format extension string representing special file 1233 * 1234 */ 1235 1236static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1237 u32 perm, const char *extension) 1238{ 1239 struct p9_fid *fid; 1240 struct v9fs_session_info *v9ses; 1241 1242 v9ses = v9fs_inode2v9ses(dir); 1243 if (!v9fs_proto_dotu(v9ses)) { 1244 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1245 return -EPERM; 1246 } 1247 1248 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1249 P9_OREAD); 1250 if (IS_ERR(fid)) 1251 return PTR_ERR(fid); 1252 1253 v9fs_invalidate_inode_attr(dir); 1254 p9_client_clunk(fid); 1255 return 0; 1256} 1257 1258/** 1259 * v9fs_vfs_symlink - helper function to create symlinks 1260 * @dir: directory inode containing symlink 1261 * @dentry: dentry for symlink 1262 * @symname: symlink data 1263 * 1264 * See Also: 9P2000.u RFC for more information 1265 * 1266 */ 1267 1268static int 1269v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1270{ 1271 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1272 dir->i_ino, dentry, symname); 1273 1274 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1275} 1276 1277#define U32_MAX_DIGITS 10 1278 1279/** 1280 * v9fs_vfs_link - create a hardlink 1281 * @old_dentry: dentry for file to link to 1282 * @dir: inode destination for new link 1283 * @dentry: dentry for link 1284 * 1285 */ 1286 1287static int 1288v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1289 struct dentry *dentry) 1290{ 1291 int retval; 1292 char name[1 + U32_MAX_DIGITS + 2]; /* sign + number + \n + \0 */ 1293 struct p9_fid *oldfid; 1294 1295 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1296 dir->i_ino, dentry, old_dentry); 1297 1298 oldfid = v9fs_fid_clone(old_dentry); 1299 if (IS_ERR(oldfid)) 1300 return PTR_ERR(oldfid); 1301 1302 sprintf(name, "%d\n", oldfid->fid); 1303 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1304 if (!retval) { 1305 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1306 v9fs_invalidate_inode_attr(dir); 1307 } 1308 p9_client_clunk(oldfid); 1309 return retval; 1310} 1311 1312/** 1313 * v9fs_vfs_mknod - create a special file 1314 * @dir: inode destination for new link 1315 * @dentry: dentry for file 1316 * @mode: mode for creation 1317 * @rdev: device associated with special file 1318 * 1319 */ 1320 1321static int 1322v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1323{ 1324 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1325 int retval; 1326 char name[2 + U32_MAX_DIGITS + 1 + U32_MAX_DIGITS + 1]; 1327 u32 perm; 1328 1329 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1330 dir->i_ino, dentry, mode, 1331 MAJOR(rdev), MINOR(rdev)); 1332 1333 /* build extension */ 1334 if (S_ISBLK(mode)) 1335 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1336 else if (S_ISCHR(mode)) 1337 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1338 else 1339 *name = 0; 1340 1341 perm = unixmode2p9mode(v9ses, mode); 1342 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1343 1344 return retval; 1345} 1346 1347int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1348{ 1349 int umode; 1350 dev_t rdev; 1351 struct p9_wstat *st; 1352 struct v9fs_session_info *v9ses; 1353 unsigned int flags; 1354 1355 v9ses = v9fs_inode2v9ses(inode); 1356 st = p9_client_stat(fid); 1357 if (IS_ERR(st)) 1358 return PTR_ERR(st); 1359 /* 1360 * Don't update inode if the file type is different 1361 */ 1362 umode = p9mode2unixmode(v9ses, st, &rdev); 1363 if (inode_wrong_type(inode, umode)) 1364 goto out; 1365 1366 /* 1367 * We don't want to refresh inode->i_size, 1368 * because we may have cached data 1369 */ 1370 flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ? 1371 V9FS_STAT2INODE_KEEP_ISIZE : 0; 1372 v9fs_stat2inode(st, inode, inode->i_sb, flags); 1373out: 1374 p9stat_free(st); 1375 kfree(st); 1376 return 0; 1377} 1378 1379static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1380 .create = v9fs_vfs_create, 1381 .lookup = v9fs_vfs_lookup, 1382 .atomic_open = v9fs_vfs_atomic_open, 1383 .symlink = v9fs_vfs_symlink, 1384 .link = v9fs_vfs_link, 1385 .unlink = v9fs_vfs_unlink, 1386 .mkdir = v9fs_vfs_mkdir, 1387 .rmdir = v9fs_vfs_rmdir, 1388 .mknod = v9fs_vfs_mknod, 1389 .rename = v9fs_vfs_rename, 1390 .getattr = v9fs_vfs_getattr, 1391 .setattr = v9fs_vfs_setattr, 1392}; 1393 1394static const struct inode_operations v9fs_dir_inode_operations = { 1395 .create = v9fs_vfs_create, 1396 .lookup = v9fs_vfs_lookup, 1397 .atomic_open = v9fs_vfs_atomic_open, 1398 .unlink = v9fs_vfs_unlink, 1399 .mkdir = v9fs_vfs_mkdir, 1400 .rmdir = v9fs_vfs_rmdir, 1401 .mknod = v9fs_vfs_mknod, 1402 .rename = v9fs_vfs_rename, 1403 .getattr = v9fs_vfs_getattr, 1404 .setattr = v9fs_vfs_setattr, 1405}; 1406 1407static const struct inode_operations v9fs_file_inode_operations = { 1408 .getattr = v9fs_vfs_getattr, 1409 .setattr = v9fs_vfs_setattr, 1410}; 1411 1412static const struct inode_operations v9fs_symlink_inode_operations = { 1413 .get_link = v9fs_vfs_get_link, 1414 .getattr = v9fs_vfs_getattr, 1415 .setattr = v9fs_vfs_setattr, 1416}; 1417 1418