1 /* 2 * linux/fs/9p/vfs_inode.c 3 * 4 * This file contains vfs inode ops for the 9P2000 protocol. 5 * 6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #include <linux/module.h> 27 #include <linux/errno.h> 28 #include <linux/fs.h> 29 #include <linux/file.h> 30 #include <linux/pagemap.h> 31 #include <linux/stat.h> 32 #include <linux/string.h> 33 #include <linux/inet.h> 34 #include <linux/namei.h> 35 #include <linux/idr.h> 36 #include <linux/sched.h> 37 #include <linux/slab.h> 38 #include <linux/xattr.h> 39 #include <linux/posix_acl.h> 40 #include <net/9p/9p.h> 41 #include <net/9p/client.h> 42 43 #include "v9fs.h" 44 #include "v9fs_vfs.h" 45 #include "fid.h" 46 #include "cache.h" 47 #include "xattr.h" 48 #include "acl.h" 49 50 static const struct inode_operations v9fs_dir_inode_operations; 51 static const struct inode_operations v9fs_dir_inode_operations_dotu; 52 static const struct inode_operations v9fs_file_inode_operations; 53 static const struct inode_operations v9fs_symlink_inode_operations; 54 55 /** 56 * unixmode2p9mode - convert unix mode bits to plan 9 57 * @v9ses: v9fs session information 58 * @mode: mode to convert 59 * 60 */ 61 62 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 63 { 64 int res; 65 res = mode & 0777; 66 if (S_ISDIR(mode)) 67 res |= P9_DMDIR; 68 if (v9fs_proto_dotu(v9ses)) { 69 if (S_ISLNK(mode)) 70 res |= P9_DMSYMLINK; 71 if (v9ses->nodev == 0) { 72 if (S_ISSOCK(mode)) 73 res |= P9_DMSOCKET; 74 if (S_ISFIFO(mode)) 75 res |= P9_DMNAMEDPIPE; 76 if (S_ISBLK(mode)) 77 res |= P9_DMDEVICE; 78 if (S_ISCHR(mode)) 79 res |= P9_DMDEVICE; 80 } 81 82 if ((mode & S_ISUID) == S_ISUID) 83 res |= P9_DMSETUID; 84 if ((mode & S_ISGID) == S_ISGID) 85 res |= P9_DMSETGID; 86 if ((mode & S_ISVTX) == S_ISVTX) 87 res |= P9_DMSETVTX; 88 if ((mode & P9_DMLINK)) 89 res |= P9_DMLINK; 90 } 91 92 return res; 93 } 94 95 /** 96 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 97 * @v9ses: v9fs session information 98 * @stat: p9_wstat from which mode need to be derived 99 * @rdev: major number, minor number in case of device files. 100 * 101 */ 102 static int p9mode2unixmode(struct v9fs_session_info *v9ses, 103 struct p9_wstat *stat, dev_t *rdev) 104 { 105 int res; 106 int mode = stat->mode; 107 108 res = mode & S_IALLUGO; 109 *rdev = 0; 110 111 if ((mode & P9_DMDIR) == P9_DMDIR) 112 res |= S_IFDIR; 113 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 114 res |= S_IFLNK; 115 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 116 && (v9ses->nodev == 0)) 117 res |= S_IFSOCK; 118 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 119 && (v9ses->nodev == 0)) 120 res |= S_IFIFO; 121 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 122 && (v9ses->nodev == 0)) { 123 char type = 0, ext[32]; 124 int major = -1, minor = -1; 125 126 strncpy(ext, stat->extension, sizeof(ext)); 127 sscanf(ext, "%c %u %u", &type, &major, &minor); 128 switch (type) { 129 case 'c': 130 res |= S_IFCHR; 131 break; 132 case 'b': 133 res |= S_IFBLK; 134 break; 135 default: 136 P9_DPRINTK(P9_DEBUG_ERROR, 137 "Unknown special type %c %s\n", type, 138 stat->extension); 139 }; 140 *rdev = MKDEV(major, minor); 141 } else 142 res |= S_IFREG; 143 144 if (v9fs_proto_dotu(v9ses)) { 145 if ((mode & P9_DMSETUID) == P9_DMSETUID) 146 res |= S_ISUID; 147 148 if ((mode & P9_DMSETGID) == P9_DMSETGID) 149 res |= S_ISGID; 150 151 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 152 res |= S_ISVTX; 153 } 154 return res; 155 } 156 157 /** 158 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 159 * @uflags: flags to convert 160 * @extended: if .u extensions are active 161 */ 162 163 int v9fs_uflags2omode(int uflags, int extended) 164 { 165 int ret; 166 167 ret = 0; 168 switch (uflags&3) { 169 default: 170 case O_RDONLY: 171 ret = P9_OREAD; 172 break; 173 174 case O_WRONLY: 175 ret = P9_OWRITE; 176 break; 177 178 case O_RDWR: 179 ret = P9_ORDWR; 180 break; 181 } 182 183 if (uflags & O_TRUNC) 184 ret |= P9_OTRUNC; 185 186 if (extended) { 187 if (uflags & O_EXCL) 188 ret |= P9_OEXCL; 189 190 if (uflags & O_APPEND) 191 ret |= P9_OAPPEND; 192 } 193 194 return ret; 195 } 196 197 /** 198 * v9fs_blank_wstat - helper function to setup a 9P stat structure 199 * @wstat: structure to initialize 200 * 201 */ 202 203 void 204 v9fs_blank_wstat(struct p9_wstat *wstat) 205 { 206 wstat->type = ~0; 207 wstat->dev = ~0; 208 wstat->qid.type = ~0; 209 wstat->qid.version = ~0; 210 *((long long *)&wstat->qid.path) = ~0; 211 wstat->mode = ~0; 212 wstat->atime = ~0; 213 wstat->mtime = ~0; 214 wstat->length = ~0; 215 wstat->name = NULL; 216 wstat->uid = NULL; 217 wstat->gid = NULL; 218 wstat->muid = NULL; 219 wstat->n_uid = ~0; 220 wstat->n_gid = ~0; 221 wstat->n_muid = ~0; 222 wstat->extension = NULL; 223 } 224 225 /** 226 * v9fs_alloc_inode - helper function to allocate an inode 227 * 228 */ 229 struct inode *v9fs_alloc_inode(struct super_block *sb) 230 { 231 struct v9fs_inode *v9inode; 232 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 233 GFP_KERNEL); 234 if (!v9inode) 235 return NULL; 236 #ifdef CONFIG_9P_FSCACHE 237 v9inode->fscache = NULL; 238 spin_lock_init(&v9inode->fscache_lock); 239 #endif 240 v9inode->writeback_fid = NULL; 241 v9inode->cache_validity = 0; 242 mutex_init(&v9inode->v_mutex); 243 return &v9inode->vfs_inode; 244 } 245 246 /** 247 * v9fs_destroy_inode - destroy an inode 248 * 249 */ 250 251 static void v9fs_i_callback(struct rcu_head *head) 252 { 253 struct inode *inode = container_of(head, struct inode, i_rcu); 254 INIT_LIST_HEAD(&inode->i_dentry); 255 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 256 } 257 258 void v9fs_destroy_inode(struct inode *inode) 259 { 260 call_rcu(&inode->i_rcu, v9fs_i_callback); 261 } 262 263 int v9fs_init_inode(struct v9fs_session_info *v9ses, 264 struct inode *inode, int mode, dev_t rdev) 265 { 266 int err = 0; 267 268 inode_init_owner(inode, NULL, mode); 269 inode->i_blocks = 0; 270 inode->i_rdev = rdev; 271 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 272 inode->i_mapping->a_ops = &v9fs_addr_operations; 273 274 switch (mode & S_IFMT) { 275 case S_IFIFO: 276 case S_IFBLK: 277 case S_IFCHR: 278 case S_IFSOCK: 279 if (v9fs_proto_dotl(v9ses)) { 280 inode->i_op = &v9fs_file_inode_operations_dotl; 281 } else if (v9fs_proto_dotu(v9ses)) { 282 inode->i_op = &v9fs_file_inode_operations; 283 } else { 284 P9_DPRINTK(P9_DEBUG_ERROR, 285 "special files without extended mode\n"); 286 err = -EINVAL; 287 goto error; 288 } 289 init_special_inode(inode, inode->i_mode, inode->i_rdev); 290 break; 291 case S_IFREG: 292 if (v9fs_proto_dotl(v9ses)) { 293 inode->i_op = &v9fs_file_inode_operations_dotl; 294 if (v9ses->cache) 295 inode->i_fop = 296 &v9fs_cached_file_operations_dotl; 297 else 298 inode->i_fop = &v9fs_file_operations_dotl; 299 } else { 300 inode->i_op = &v9fs_file_inode_operations; 301 if (v9ses->cache) 302 inode->i_fop = &v9fs_cached_file_operations; 303 else 304 inode->i_fop = &v9fs_file_operations; 305 } 306 307 break; 308 case S_IFLNK: 309 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 310 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 311 "legacy protocol.\n"); 312 err = -EINVAL; 313 goto error; 314 } 315 316 if (v9fs_proto_dotl(v9ses)) 317 inode->i_op = &v9fs_symlink_inode_operations_dotl; 318 else 319 inode->i_op = &v9fs_symlink_inode_operations; 320 321 break; 322 case S_IFDIR: 323 inc_nlink(inode); 324 if (v9fs_proto_dotl(v9ses)) 325 inode->i_op = &v9fs_dir_inode_operations_dotl; 326 else if (v9fs_proto_dotu(v9ses)) 327 inode->i_op = &v9fs_dir_inode_operations_dotu; 328 else 329 inode->i_op = &v9fs_dir_inode_operations; 330 331 if (v9fs_proto_dotl(v9ses)) 332 inode->i_fop = &v9fs_dir_operations_dotl; 333 else 334 inode->i_fop = &v9fs_dir_operations; 335 336 break; 337 default: 338 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 339 mode, mode & S_IFMT); 340 err = -EINVAL; 341 goto error; 342 } 343 error: 344 return err; 345 346 } 347 348 /** 349 * v9fs_get_inode - helper function to setup an inode 350 * @sb: superblock 351 * @mode: mode to setup inode with 352 * 353 */ 354 355 struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev) 356 { 357 int err; 358 struct inode *inode; 359 struct v9fs_session_info *v9ses = sb->s_fs_info; 360 361 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 362 363 inode = new_inode(sb); 364 if (!inode) { 365 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 366 return ERR_PTR(-ENOMEM); 367 } 368 err = v9fs_init_inode(v9ses, inode, mode, rdev); 369 if (err) { 370 iput(inode); 371 return ERR_PTR(err); 372 } 373 return inode; 374 } 375 376 /* 377 static struct v9fs_fid* 378 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 379 { 380 int err; 381 int nfid; 382 struct v9fs_fid *ret; 383 struct v9fs_fcall *fcall; 384 385 nfid = v9fs_get_idpool(&v9ses->fidpool); 386 if (nfid < 0) { 387 eprintk(KERN_WARNING, "no free fids available\n"); 388 return ERR_PTR(-ENOSPC); 389 } 390 391 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 392 &fcall); 393 394 if (err < 0) { 395 if (fcall && fcall->id == RWALK) 396 goto clunk_fid; 397 398 PRINT_FCALL_ERROR("walk error", fcall); 399 v9fs_put_idpool(nfid, &v9ses->fidpool); 400 goto error; 401 } 402 403 kfree(fcall); 404 fcall = NULL; 405 ret = v9fs_fid_create(v9ses, nfid); 406 if (!ret) { 407 err = -ENOMEM; 408 goto clunk_fid; 409 } 410 411 err = v9fs_fid_insert(ret, dentry); 412 if (err < 0) { 413 v9fs_fid_destroy(ret); 414 goto clunk_fid; 415 } 416 417 return ret; 418 419 clunk_fid: 420 v9fs_t_clunk(v9ses, nfid); 421 422 error: 423 kfree(fcall); 424 return ERR_PTR(err); 425 } 426 */ 427 428 429 /** 430 * v9fs_clear_inode - release an inode 431 * @inode: inode to release 432 * 433 */ 434 void v9fs_evict_inode(struct inode *inode) 435 { 436 struct v9fs_inode *v9inode = V9FS_I(inode); 437 438 truncate_inode_pages(inode->i_mapping, 0); 439 end_writeback(inode); 440 filemap_fdatawrite(inode->i_mapping); 441 442 #ifdef CONFIG_9P_FSCACHE 443 v9fs_cache_inode_put_cookie(inode); 444 #endif 445 /* clunk the fid stashed in writeback_fid */ 446 if (v9inode->writeback_fid) { 447 p9_client_clunk(v9inode->writeback_fid); 448 v9inode->writeback_fid = NULL; 449 } 450 } 451 452 static int v9fs_test_inode(struct inode *inode, void *data) 453 { 454 int umode; 455 dev_t rdev; 456 struct v9fs_inode *v9inode = V9FS_I(inode); 457 struct p9_wstat *st = (struct p9_wstat *)data; 458 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 459 460 umode = p9mode2unixmode(v9ses, st, &rdev); 461 /* don't match inode of different type */ 462 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 463 return 0; 464 465 /* compare qid details */ 466 if (memcmp(&v9inode->qid.version, 467 &st->qid.version, sizeof(v9inode->qid.version))) 468 return 0; 469 470 if (v9inode->qid.type != st->qid.type) 471 return 0; 472 return 1; 473 } 474 475 static int v9fs_test_new_inode(struct inode *inode, void *data) 476 { 477 return 0; 478 } 479 480 static int v9fs_set_inode(struct inode *inode, void *data) 481 { 482 struct v9fs_inode *v9inode = V9FS_I(inode); 483 struct p9_wstat *st = (struct p9_wstat *)data; 484 485 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 486 return 0; 487 } 488 489 static struct inode *v9fs_qid_iget(struct super_block *sb, 490 struct p9_qid *qid, 491 struct p9_wstat *st, 492 int new) 493 { 494 dev_t rdev; 495 int retval, umode; 496 unsigned long i_ino; 497 struct inode *inode; 498 struct v9fs_session_info *v9ses = sb->s_fs_info; 499 int (*test)(struct inode *, void *); 500 501 if (new) 502 test = v9fs_test_new_inode; 503 else 504 test = v9fs_test_inode; 505 506 i_ino = v9fs_qid2ino(qid); 507 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 508 if (!inode) 509 return ERR_PTR(-ENOMEM); 510 if (!(inode->i_state & I_NEW)) 511 return inode; 512 /* 513 * initialize the inode with the stat info 514 * FIXME!! we may need support for stale inodes 515 * later. 516 */ 517 inode->i_ino = i_ino; 518 umode = p9mode2unixmode(v9ses, st, &rdev); 519 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 520 if (retval) 521 goto error; 522 523 v9fs_stat2inode(st, inode, sb); 524 #ifdef CONFIG_9P_FSCACHE 525 v9fs_cache_inode_get_cookie(inode); 526 #endif 527 unlock_new_inode(inode); 528 return inode; 529 error: 530 unlock_new_inode(inode); 531 iput(inode); 532 return ERR_PTR(retval); 533 534 } 535 536 struct inode * 537 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 538 struct super_block *sb, int new) 539 { 540 struct p9_wstat *st; 541 struct inode *inode = NULL; 542 543 st = p9_client_stat(fid); 544 if (IS_ERR(st)) 545 return ERR_CAST(st); 546 547 inode = v9fs_qid_iget(sb, &st->qid, st, new); 548 p9stat_free(st); 549 kfree(st); 550 return inode; 551 } 552 553 /** 554 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 555 * plan 9 AT flag. 556 * @flags: flags to convert 557 */ 558 static int v9fs_at_to_dotl_flags(int flags) 559 { 560 int rflags = 0; 561 if (flags & AT_REMOVEDIR) 562 rflags |= P9_DOTL_AT_REMOVEDIR; 563 return rflags; 564 } 565 566 /** 567 * v9fs_remove - helper function to remove files and directories 568 * @dir: directory inode that is being deleted 569 * @dentry: dentry that is being deleted 570 * @rmdir: removing a directory 571 * 572 */ 573 574 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 575 { 576 struct inode *inode; 577 int retval = -EOPNOTSUPP; 578 struct p9_fid *v9fid, *dfid; 579 struct v9fs_session_info *v9ses; 580 581 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 582 dir, dentry, flags); 583 584 v9ses = v9fs_inode2v9ses(dir); 585 inode = dentry->d_inode; 586 dfid = v9fs_fid_lookup(dentry->d_parent); 587 if (IS_ERR(dfid)) { 588 retval = PTR_ERR(dfid); 589 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 590 return retval; 591 } 592 if (v9fs_proto_dotl(v9ses)) 593 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 594 v9fs_at_to_dotl_flags(flags)); 595 if (retval == -EOPNOTSUPP) { 596 /* Try the one based on path */ 597 v9fid = v9fs_fid_clone(dentry); 598 if (IS_ERR(v9fid)) 599 return PTR_ERR(v9fid); 600 retval = p9_client_remove(v9fid); 601 } 602 if (!retval) { 603 /* 604 * directories on unlink should have zero 605 * link count 606 */ 607 if (flags & AT_REMOVEDIR) { 608 clear_nlink(inode); 609 drop_nlink(dir); 610 } else 611 drop_nlink(inode); 612 613 v9fs_invalidate_inode_attr(inode); 614 v9fs_invalidate_inode_attr(dir); 615 } 616 return retval; 617 } 618 619 /** 620 * v9fs_create - Create a file 621 * @v9ses: session information 622 * @dir: directory that dentry is being created in 623 * @dentry: dentry that is being created 624 * @extension: 9p2000.u extension string to support devices, etc. 625 * @perm: create permissions 626 * @mode: open mode 627 * 628 */ 629 static struct p9_fid * 630 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 631 struct dentry *dentry, char *extension, u32 perm, u8 mode) 632 { 633 int err; 634 char *name; 635 struct p9_fid *dfid, *ofid, *fid; 636 struct inode *inode; 637 638 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 639 640 err = 0; 641 ofid = NULL; 642 fid = NULL; 643 name = (char *) dentry->d_name.name; 644 dfid = v9fs_fid_lookup(dentry->d_parent); 645 if (IS_ERR(dfid)) { 646 err = PTR_ERR(dfid); 647 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 648 return ERR_PTR(err); 649 } 650 651 /* clone a fid to use for creation */ 652 ofid = p9_client_walk(dfid, 0, NULL, 1); 653 if (IS_ERR(ofid)) { 654 err = PTR_ERR(ofid); 655 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 656 return ERR_PTR(err); 657 } 658 659 err = p9_client_fcreate(ofid, name, perm, mode, extension); 660 if (err < 0) { 661 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 662 goto error; 663 } 664 665 /* now walk from the parent so we can get unopened fid */ 666 fid = p9_client_walk(dfid, 1, &name, 1); 667 if (IS_ERR(fid)) { 668 err = PTR_ERR(fid); 669 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 670 fid = NULL; 671 goto error; 672 } 673 674 /* instantiate inode and assign the unopened fid to the dentry */ 675 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 676 if (IS_ERR(inode)) { 677 err = PTR_ERR(inode); 678 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 679 goto error; 680 } 681 err = v9fs_fid_add(dentry, fid); 682 if (err < 0) 683 goto error; 684 d_instantiate(dentry, inode); 685 return ofid; 686 error: 687 if (ofid) 688 p9_client_clunk(ofid); 689 690 if (fid) 691 p9_client_clunk(fid); 692 693 return ERR_PTR(err); 694 } 695 696 /** 697 * v9fs_vfs_create - VFS hook to create files 698 * @dir: directory inode that is being created 699 * @dentry: dentry that is being deleted 700 * @mode: create permissions 701 * @nd: path information 702 * 703 */ 704 705 static int 706 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 707 struct nameidata *nd) 708 { 709 int err; 710 u32 perm; 711 int flags; 712 struct file *filp; 713 struct v9fs_inode *v9inode; 714 struct v9fs_session_info *v9ses; 715 struct p9_fid *fid, *inode_fid; 716 717 err = 0; 718 fid = NULL; 719 v9ses = v9fs_inode2v9ses(dir); 720 perm = unixmode2p9mode(v9ses, mode); 721 if (nd) 722 flags = nd->intent.open.flags; 723 else 724 flags = O_RDWR; 725 726 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 727 v9fs_uflags2omode(flags, 728 v9fs_proto_dotu(v9ses))); 729 if (IS_ERR(fid)) { 730 err = PTR_ERR(fid); 731 fid = NULL; 732 goto error; 733 } 734 735 v9fs_invalidate_inode_attr(dir); 736 /* if we are opening a file, assign the open fid to the file */ 737 if (nd) { 738 v9inode = V9FS_I(dentry->d_inode); 739 mutex_lock(&v9inode->v_mutex); 740 if (v9ses->cache && !v9inode->writeback_fid && 741 ((flags & O_ACCMODE) != O_RDONLY)) { 742 /* 743 * clone a fid and add it to writeback_fid 744 * we do it during open time instead of 745 * page dirty time via write_begin/page_mkwrite 746 * because we want write after unlink usecase 747 * to work. 748 */ 749 inode_fid = v9fs_writeback_fid(dentry); 750 if (IS_ERR(inode_fid)) { 751 err = PTR_ERR(inode_fid); 752 mutex_unlock(&v9inode->v_mutex); 753 goto error; 754 } 755 v9inode->writeback_fid = (void *) inode_fid; 756 } 757 mutex_unlock(&v9inode->v_mutex); 758 filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 759 if (IS_ERR(filp)) { 760 err = PTR_ERR(filp); 761 goto error; 762 } 763 764 filp->private_data = fid; 765 #ifdef CONFIG_9P_FSCACHE 766 if (v9ses->cache) 767 v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 768 #endif 769 } else 770 p9_client_clunk(fid); 771 772 return 0; 773 774 error: 775 if (fid) 776 p9_client_clunk(fid); 777 778 return err; 779 } 780 781 /** 782 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 783 * @dir: inode that is being unlinked 784 * @dentry: dentry that is being unlinked 785 * @mode: mode for new directory 786 * 787 */ 788 789 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 790 { 791 int err; 792 u32 perm; 793 struct p9_fid *fid; 794 struct v9fs_session_info *v9ses; 795 796 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 797 err = 0; 798 v9ses = v9fs_inode2v9ses(dir); 799 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 800 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 801 if (IS_ERR(fid)) { 802 err = PTR_ERR(fid); 803 fid = NULL; 804 } else { 805 inc_nlink(dir); 806 v9fs_invalidate_inode_attr(dir); 807 } 808 809 if (fid) 810 p9_client_clunk(fid); 811 812 return err; 813 } 814 815 /** 816 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 817 * @dir: inode that is being walked from 818 * @dentry: dentry that is being walked to? 819 * @nameidata: path data 820 * 821 */ 822 823 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 824 struct nameidata *nameidata) 825 { 826 struct dentry *res; 827 struct super_block *sb; 828 struct v9fs_session_info *v9ses; 829 struct p9_fid *dfid, *fid; 830 struct inode *inode; 831 char *name; 832 int result = 0; 833 834 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 835 dir, dentry->d_name.name, dentry, nameidata); 836 837 if (dentry->d_name.len > NAME_MAX) 838 return ERR_PTR(-ENAMETOOLONG); 839 840 sb = dir->i_sb; 841 v9ses = v9fs_inode2v9ses(dir); 842 /* We can walk d_parent because we hold the dir->i_mutex */ 843 dfid = v9fs_fid_lookup(dentry->d_parent); 844 if (IS_ERR(dfid)) 845 return ERR_CAST(dfid); 846 847 name = (char *) dentry->d_name.name; 848 fid = p9_client_walk(dfid, 1, &name, 1); 849 if (IS_ERR(fid)) { 850 result = PTR_ERR(fid); 851 if (result == -ENOENT) { 852 inode = NULL; 853 goto inst_out; 854 } 855 856 return ERR_PTR(result); 857 } 858 /* 859 * Make sure we don't use a wrong inode due to parallel 860 * unlink. For cached mode create calls request for new 861 * inode. But with cache disabled, lookup should do this. 862 */ 863 if (v9ses->cache) 864 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 865 else 866 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 867 if (IS_ERR(inode)) { 868 result = PTR_ERR(inode); 869 inode = NULL; 870 goto error; 871 } 872 result = v9fs_fid_add(dentry, fid); 873 if (result < 0) 874 goto error_iput; 875 inst_out: 876 /* 877 * If we had a rename on the server and a parallel lookup 878 * for the new name, then make sure we instantiate with 879 * the new name. ie look up for a/b, while on server somebody 880 * moved b under k and client parallely did a lookup for 881 * k/b. 882 */ 883 res = d_materialise_unique(dentry, inode); 884 if (!IS_ERR(res)) 885 return res; 886 result = PTR_ERR(res); 887 error_iput: 888 iput(inode); 889 error: 890 p9_client_clunk(fid); 891 892 return ERR_PTR(result); 893 } 894 895 /** 896 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 897 * @i: inode that is being unlinked 898 * @d: dentry that is being unlinked 899 * 900 */ 901 902 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 903 { 904 return v9fs_remove(i, d, 0); 905 } 906 907 /** 908 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 909 * @i: inode that is being unlinked 910 * @d: dentry that is being unlinked 911 * 912 */ 913 914 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 915 { 916 return v9fs_remove(i, d, AT_REMOVEDIR); 917 } 918 919 /** 920 * v9fs_vfs_rename - VFS hook to rename an inode 921 * @old_dir: old dir inode 922 * @old_dentry: old dentry 923 * @new_dir: new dir inode 924 * @new_dentry: new dentry 925 * 926 */ 927 928 int 929 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 930 struct inode *new_dir, struct dentry *new_dentry) 931 { 932 int retval; 933 struct inode *old_inode; 934 struct inode *new_inode; 935 struct v9fs_session_info *v9ses; 936 struct p9_fid *oldfid; 937 struct p9_fid *olddirfid; 938 struct p9_fid *newdirfid; 939 struct p9_wstat wstat; 940 941 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 942 retval = 0; 943 old_inode = old_dentry->d_inode; 944 new_inode = new_dentry->d_inode; 945 v9ses = v9fs_inode2v9ses(old_inode); 946 oldfid = v9fs_fid_lookup(old_dentry); 947 if (IS_ERR(oldfid)) 948 return PTR_ERR(oldfid); 949 950 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 951 if (IS_ERR(olddirfid)) { 952 retval = PTR_ERR(olddirfid); 953 goto done; 954 } 955 956 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 957 if (IS_ERR(newdirfid)) { 958 retval = PTR_ERR(newdirfid); 959 goto clunk_olddir; 960 } 961 962 down_write(&v9ses->rename_sem); 963 if (v9fs_proto_dotl(v9ses)) { 964 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 965 newdirfid, new_dentry->d_name.name); 966 if (retval == -EOPNOTSUPP) 967 retval = p9_client_rename(oldfid, newdirfid, 968 new_dentry->d_name.name); 969 if (retval != -EOPNOTSUPP) 970 goto clunk_newdir; 971 } 972 if (old_dentry->d_parent != new_dentry->d_parent) { 973 /* 974 * 9P .u can only handle file rename in the same directory 975 */ 976 977 P9_DPRINTK(P9_DEBUG_ERROR, 978 "old dir and new dir are different\n"); 979 retval = -EXDEV; 980 goto clunk_newdir; 981 } 982 v9fs_blank_wstat(&wstat); 983 wstat.muid = v9ses->uname; 984 wstat.name = (char *) new_dentry->d_name.name; 985 retval = p9_client_wstat(oldfid, &wstat); 986 987 clunk_newdir: 988 if (!retval) { 989 if (new_inode) { 990 if (S_ISDIR(new_inode->i_mode)) 991 clear_nlink(new_inode); 992 else 993 drop_nlink(new_inode); 994 } 995 if (S_ISDIR(old_inode->i_mode)) { 996 if (!new_inode) 997 inc_nlink(new_dir); 998 drop_nlink(old_dir); 999 } 1000 v9fs_invalidate_inode_attr(old_inode); 1001 v9fs_invalidate_inode_attr(old_dir); 1002 v9fs_invalidate_inode_attr(new_dir); 1003 1004 /* successful rename */ 1005 d_move(old_dentry, new_dentry); 1006 } 1007 up_write(&v9ses->rename_sem); 1008 p9_client_clunk(newdirfid); 1009 1010 clunk_olddir: 1011 p9_client_clunk(olddirfid); 1012 1013 done: 1014 return retval; 1015 } 1016 1017 /** 1018 * v9fs_vfs_getattr - retrieve file metadata 1019 * @mnt: mount information 1020 * @dentry: file to get attributes on 1021 * @stat: metadata structure to populate 1022 * 1023 */ 1024 1025 static int 1026 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1027 struct kstat *stat) 1028 { 1029 int err; 1030 struct v9fs_session_info *v9ses; 1031 struct p9_fid *fid; 1032 struct p9_wstat *st; 1033 1034 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1035 err = -EPERM; 1036 v9ses = v9fs_dentry2v9ses(dentry); 1037 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1038 generic_fillattr(dentry->d_inode, stat); 1039 return 0; 1040 } 1041 fid = v9fs_fid_lookup(dentry); 1042 if (IS_ERR(fid)) 1043 return PTR_ERR(fid); 1044 1045 st = p9_client_stat(fid); 1046 if (IS_ERR(st)) 1047 return PTR_ERR(st); 1048 1049 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 1050 generic_fillattr(dentry->d_inode, stat); 1051 1052 p9stat_free(st); 1053 kfree(st); 1054 return 0; 1055 } 1056 1057 /** 1058 * v9fs_vfs_setattr - set file metadata 1059 * @dentry: file whose metadata to set 1060 * @iattr: metadata assignment structure 1061 * 1062 */ 1063 1064 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1065 { 1066 int retval; 1067 struct v9fs_session_info *v9ses; 1068 struct p9_fid *fid; 1069 struct p9_wstat wstat; 1070 1071 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 1072 retval = inode_change_ok(dentry->d_inode, iattr); 1073 if (retval) 1074 return retval; 1075 1076 retval = -EPERM; 1077 v9ses = v9fs_dentry2v9ses(dentry); 1078 fid = v9fs_fid_lookup(dentry); 1079 if(IS_ERR(fid)) 1080 return PTR_ERR(fid); 1081 1082 v9fs_blank_wstat(&wstat); 1083 if (iattr->ia_valid & ATTR_MODE) 1084 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1085 1086 if (iattr->ia_valid & ATTR_MTIME) 1087 wstat.mtime = iattr->ia_mtime.tv_sec; 1088 1089 if (iattr->ia_valid & ATTR_ATIME) 1090 wstat.atime = iattr->ia_atime.tv_sec; 1091 1092 if (iattr->ia_valid & ATTR_SIZE) 1093 wstat.length = iattr->ia_size; 1094 1095 if (v9fs_proto_dotu(v9ses)) { 1096 if (iattr->ia_valid & ATTR_UID) 1097 wstat.n_uid = iattr->ia_uid; 1098 1099 if (iattr->ia_valid & ATTR_GID) 1100 wstat.n_gid = iattr->ia_gid; 1101 } 1102 1103 /* Write all dirty data */ 1104 if (S_ISREG(dentry->d_inode->i_mode)) 1105 filemap_write_and_wait(dentry->d_inode->i_mapping); 1106 1107 retval = p9_client_wstat(fid, &wstat); 1108 if (retval < 0) 1109 return retval; 1110 1111 if ((iattr->ia_valid & ATTR_SIZE) && 1112 iattr->ia_size != i_size_read(dentry->d_inode)) 1113 truncate_setsize(dentry->d_inode, iattr->ia_size); 1114 1115 v9fs_invalidate_inode_attr(dentry->d_inode); 1116 1117 setattr_copy(dentry->d_inode, iattr); 1118 mark_inode_dirty(dentry->d_inode); 1119 return 0; 1120 } 1121 1122 /** 1123 * v9fs_stat2inode - populate an inode structure with mistat info 1124 * @stat: Plan 9 metadata (mistat) structure 1125 * @inode: inode to populate 1126 * @sb: superblock of filesystem 1127 * 1128 */ 1129 1130 void 1131 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1132 struct super_block *sb) 1133 { 1134 mode_t mode; 1135 char ext[32]; 1136 char tag_name[14]; 1137 unsigned int i_nlink; 1138 struct v9fs_session_info *v9ses = sb->s_fs_info; 1139 struct v9fs_inode *v9inode = V9FS_I(inode); 1140 1141 inode->i_nlink = 1; 1142 1143 inode->i_atime.tv_sec = stat->atime; 1144 inode->i_mtime.tv_sec = stat->mtime; 1145 inode->i_ctime.tv_sec = stat->mtime; 1146 1147 inode->i_uid = v9ses->dfltuid; 1148 inode->i_gid = v9ses->dfltgid; 1149 1150 if (v9fs_proto_dotu(v9ses)) { 1151 inode->i_uid = stat->n_uid; 1152 inode->i_gid = stat->n_gid; 1153 } 1154 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1155 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1156 /* 1157 * Hadlink support got added later to 1158 * to the .u extension. So there can be 1159 * server out there that doesn't support 1160 * this even with .u extension. So check 1161 * for non NULL stat->extension 1162 */ 1163 strncpy(ext, stat->extension, sizeof(ext)); 1164 /* HARDLINKCOUNT %u */ 1165 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1166 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1167 inode->i_nlink = i_nlink; 1168 } 1169 } 1170 mode = stat->mode & S_IALLUGO; 1171 mode |= inode->i_mode & ~S_IALLUGO; 1172 inode->i_mode = mode; 1173 i_size_write(inode, stat->length); 1174 1175 /* not real number of blocks, but 512 byte ones ... */ 1176 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1177 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1178 } 1179 1180 /** 1181 * v9fs_qid2ino - convert qid into inode number 1182 * @qid: qid to hash 1183 * 1184 * BUG: potential for inode number collisions? 1185 */ 1186 1187 ino_t v9fs_qid2ino(struct p9_qid *qid) 1188 { 1189 u64 path = qid->path + 2; 1190 ino_t i = 0; 1191 1192 if (sizeof(ino_t) == sizeof(path)) 1193 memcpy(&i, &path, sizeof(ino_t)); 1194 else 1195 i = (ino_t) (path ^ (path >> 32)); 1196 1197 return i; 1198 } 1199 1200 /** 1201 * v9fs_readlink - read a symlink's location (internal version) 1202 * @dentry: dentry for symlink 1203 * @buffer: buffer to load symlink location into 1204 * @buflen: length of buffer 1205 * 1206 */ 1207 1208 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1209 { 1210 int retval; 1211 1212 struct v9fs_session_info *v9ses; 1213 struct p9_fid *fid; 1214 struct p9_wstat *st; 1215 1216 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1217 retval = -EPERM; 1218 v9ses = v9fs_dentry2v9ses(dentry); 1219 fid = v9fs_fid_lookup(dentry); 1220 if (IS_ERR(fid)) 1221 return PTR_ERR(fid); 1222 1223 if (!v9fs_proto_dotu(v9ses)) 1224 return -EBADF; 1225 1226 st = p9_client_stat(fid); 1227 if (IS_ERR(st)) 1228 return PTR_ERR(st); 1229 1230 if (!(st->mode & P9_DMSYMLINK)) { 1231 retval = -EINVAL; 1232 goto done; 1233 } 1234 1235 /* copy extension buffer into buffer */ 1236 strncpy(buffer, st->extension, buflen); 1237 1238 P9_DPRINTK(P9_DEBUG_VFS, 1239 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1240 1241 retval = strnlen(buffer, buflen); 1242 done: 1243 p9stat_free(st); 1244 kfree(st); 1245 return retval; 1246 } 1247 1248 /** 1249 * v9fs_vfs_follow_link - follow a symlink path 1250 * @dentry: dentry for symlink 1251 * @nd: nameidata 1252 * 1253 */ 1254 1255 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1256 { 1257 int len = 0; 1258 char *link = __getname(); 1259 1260 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 1261 1262 if (!link) 1263 link = ERR_PTR(-ENOMEM); 1264 else { 1265 len = v9fs_readlink(dentry, link, PATH_MAX); 1266 1267 if (len < 0) { 1268 __putname(link); 1269 link = ERR_PTR(len); 1270 } else 1271 link[min(len, PATH_MAX-1)] = 0; 1272 } 1273 nd_set_link(nd, link); 1274 1275 return NULL; 1276 } 1277 1278 /** 1279 * v9fs_vfs_put_link - release a symlink path 1280 * @dentry: dentry for symlink 1281 * @nd: nameidata 1282 * @p: unused 1283 * 1284 */ 1285 1286 void 1287 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1288 { 1289 char *s = nd_get_link(nd); 1290 1291 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 1292 IS_ERR(s) ? "<error>" : s); 1293 if (!IS_ERR(s)) 1294 __putname(s); 1295 } 1296 1297 /** 1298 * v9fs_vfs_mkspecial - create a special file 1299 * @dir: inode to create special file in 1300 * @dentry: dentry to create 1301 * @mode: mode to create special file 1302 * @extension: 9p2000.u format extension string representing special file 1303 * 1304 */ 1305 1306 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1307 int mode, const char *extension) 1308 { 1309 u32 perm; 1310 struct p9_fid *fid; 1311 struct v9fs_session_info *v9ses; 1312 1313 v9ses = v9fs_inode2v9ses(dir); 1314 if (!v9fs_proto_dotu(v9ses)) { 1315 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 1316 return -EPERM; 1317 } 1318 1319 perm = unixmode2p9mode(v9ses, mode); 1320 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1321 P9_OREAD); 1322 if (IS_ERR(fid)) 1323 return PTR_ERR(fid); 1324 1325 v9fs_invalidate_inode_attr(dir); 1326 p9_client_clunk(fid); 1327 return 0; 1328 } 1329 1330 /** 1331 * v9fs_vfs_symlink - helper function to create symlinks 1332 * @dir: directory inode containing symlink 1333 * @dentry: dentry for symlink 1334 * @symname: symlink data 1335 * 1336 * See Also: 9P2000.u RFC for more information 1337 * 1338 */ 1339 1340 static int 1341 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1342 { 1343 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1344 dentry->d_name.name, symname); 1345 1346 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1347 } 1348 1349 /** 1350 * v9fs_vfs_link - create a hardlink 1351 * @old_dentry: dentry for file to link to 1352 * @dir: inode destination for new link 1353 * @dentry: dentry for link 1354 * 1355 */ 1356 1357 static int 1358 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1359 struct dentry *dentry) 1360 { 1361 int retval; 1362 char *name; 1363 struct p9_fid *oldfid; 1364 1365 P9_DPRINTK(P9_DEBUG_VFS, 1366 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1367 old_dentry->d_name.name); 1368 1369 oldfid = v9fs_fid_clone(old_dentry); 1370 if (IS_ERR(oldfid)) 1371 return PTR_ERR(oldfid); 1372 1373 name = __getname(); 1374 if (unlikely(!name)) { 1375 retval = -ENOMEM; 1376 goto clunk_fid; 1377 } 1378 1379 sprintf(name, "%d\n", oldfid->fid); 1380 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1381 __putname(name); 1382 if (!retval) { 1383 v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1384 v9fs_invalidate_inode_attr(dir); 1385 } 1386 clunk_fid: 1387 p9_client_clunk(oldfid); 1388 return retval; 1389 } 1390 1391 /** 1392 * v9fs_vfs_mknod - create a special file 1393 * @dir: inode destination for new link 1394 * @dentry: dentry for file 1395 * @mode: mode for creation 1396 * @rdev: device associated with special file 1397 * 1398 */ 1399 1400 static int 1401 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1402 { 1403 int retval; 1404 char *name; 1405 1406 P9_DPRINTK(P9_DEBUG_VFS, 1407 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1408 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1409 1410 if (!new_valid_dev(rdev)) 1411 return -EINVAL; 1412 1413 name = __getname(); 1414 if (!name) 1415 return -ENOMEM; 1416 /* build extension */ 1417 if (S_ISBLK(mode)) 1418 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1419 else if (S_ISCHR(mode)) 1420 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1421 else if (S_ISFIFO(mode)) 1422 *name = 0; 1423 else if (S_ISSOCK(mode)) 1424 *name = 0; 1425 else { 1426 __putname(name); 1427 return -EINVAL; 1428 } 1429 1430 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1431 __putname(name); 1432 1433 return retval; 1434 } 1435 1436 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1437 { 1438 int umode; 1439 dev_t rdev; 1440 loff_t i_size; 1441 struct p9_wstat *st; 1442 struct v9fs_session_info *v9ses; 1443 1444 v9ses = v9fs_inode2v9ses(inode); 1445 st = p9_client_stat(fid); 1446 if (IS_ERR(st)) 1447 return PTR_ERR(st); 1448 /* 1449 * Don't update inode if the file type is different 1450 */ 1451 umode = p9mode2unixmode(v9ses, st, &rdev); 1452 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1453 goto out; 1454 1455 spin_lock(&inode->i_lock); 1456 /* 1457 * We don't want to refresh inode->i_size, 1458 * because we may have cached data 1459 */ 1460 i_size = inode->i_size; 1461 v9fs_stat2inode(st, inode, inode->i_sb); 1462 if (v9ses->cache) 1463 inode->i_size = i_size; 1464 spin_unlock(&inode->i_lock); 1465 out: 1466 p9stat_free(st); 1467 kfree(st); 1468 return 0; 1469 } 1470 1471 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1472 .create = v9fs_vfs_create, 1473 .lookup = v9fs_vfs_lookup, 1474 .symlink = v9fs_vfs_symlink, 1475 .link = v9fs_vfs_link, 1476 .unlink = v9fs_vfs_unlink, 1477 .mkdir = v9fs_vfs_mkdir, 1478 .rmdir = v9fs_vfs_rmdir, 1479 .mknod = v9fs_vfs_mknod, 1480 .rename = v9fs_vfs_rename, 1481 .getattr = v9fs_vfs_getattr, 1482 .setattr = v9fs_vfs_setattr, 1483 }; 1484 1485 static const struct inode_operations v9fs_dir_inode_operations = { 1486 .create = v9fs_vfs_create, 1487 .lookup = v9fs_vfs_lookup, 1488 .unlink = v9fs_vfs_unlink, 1489 .mkdir = v9fs_vfs_mkdir, 1490 .rmdir = v9fs_vfs_rmdir, 1491 .mknod = v9fs_vfs_mknod, 1492 .rename = v9fs_vfs_rename, 1493 .getattr = v9fs_vfs_getattr, 1494 .setattr = v9fs_vfs_setattr, 1495 }; 1496 1497 static const struct inode_operations v9fs_file_inode_operations = { 1498 .getattr = v9fs_vfs_getattr, 1499 .setattr = v9fs_vfs_setattr, 1500 }; 1501 1502 static const struct inode_operations v9fs_symlink_inode_operations = { 1503 .readlink = generic_readlink, 1504 .follow_link = v9fs_vfs_follow_link, 1505 .put_link = v9fs_vfs_put_link, 1506 .getattr = v9fs_vfs_getattr, 1507 .setattr = v9fs_vfs_setattr, 1508 }; 1509 1510