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 inode->i_fop = &v9fs_file_operations_dotl; 282 } else if (v9fs_proto_dotu(v9ses)) { 283 inode->i_op = &v9fs_file_inode_operations; 284 inode->i_fop = &v9fs_file_operations; 285 } else { 286 P9_DPRINTK(P9_DEBUG_ERROR, 287 "special files without extended mode\n"); 288 err = -EINVAL; 289 goto error; 290 } 291 init_special_inode(inode, inode->i_mode, inode->i_rdev); 292 break; 293 case S_IFREG: 294 if (v9fs_proto_dotl(v9ses)) { 295 inode->i_op = &v9fs_file_inode_operations_dotl; 296 if (v9ses->cache) 297 inode->i_fop = 298 &v9fs_cached_file_operations_dotl; 299 else 300 inode->i_fop = &v9fs_file_operations_dotl; 301 } else { 302 inode->i_op = &v9fs_file_inode_operations; 303 if (v9ses->cache) 304 inode->i_fop = &v9fs_cached_file_operations; 305 else 306 inode->i_fop = &v9fs_file_operations; 307 } 308 309 break; 310 case S_IFLNK: 311 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 312 P9_DPRINTK(P9_DEBUG_ERROR, "extended modes used with " 313 "legacy protocol.\n"); 314 err = -EINVAL; 315 goto error; 316 } 317 318 if (v9fs_proto_dotl(v9ses)) 319 inode->i_op = &v9fs_symlink_inode_operations_dotl; 320 else 321 inode->i_op = &v9fs_symlink_inode_operations; 322 323 break; 324 case S_IFDIR: 325 inc_nlink(inode); 326 if (v9fs_proto_dotl(v9ses)) 327 inode->i_op = &v9fs_dir_inode_operations_dotl; 328 else if (v9fs_proto_dotu(v9ses)) 329 inode->i_op = &v9fs_dir_inode_operations_dotu; 330 else 331 inode->i_op = &v9fs_dir_inode_operations; 332 333 if (v9fs_proto_dotl(v9ses)) 334 inode->i_fop = &v9fs_dir_operations_dotl; 335 else 336 inode->i_fop = &v9fs_dir_operations; 337 338 break; 339 default: 340 P9_DPRINTK(P9_DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 341 mode, mode & S_IFMT); 342 err = -EINVAL; 343 goto error; 344 } 345 error: 346 return err; 347 348 } 349 350 /** 351 * v9fs_get_inode - helper function to setup an inode 352 * @sb: superblock 353 * @mode: mode to setup inode with 354 * 355 */ 356 357 struct inode *v9fs_get_inode(struct super_block *sb, int mode, dev_t rdev) 358 { 359 int err; 360 struct inode *inode; 361 struct v9fs_session_info *v9ses = sb->s_fs_info; 362 363 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 364 365 inode = new_inode(sb); 366 if (!inode) { 367 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 368 return ERR_PTR(-ENOMEM); 369 } 370 err = v9fs_init_inode(v9ses, inode, mode, rdev); 371 if (err) { 372 iput(inode); 373 return ERR_PTR(err); 374 } 375 return inode; 376 } 377 378 /* 379 static struct v9fs_fid* 380 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 381 { 382 int err; 383 int nfid; 384 struct v9fs_fid *ret; 385 struct v9fs_fcall *fcall; 386 387 nfid = v9fs_get_idpool(&v9ses->fidpool); 388 if (nfid < 0) { 389 eprintk(KERN_WARNING, "no free fids available\n"); 390 return ERR_PTR(-ENOSPC); 391 } 392 393 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 394 &fcall); 395 396 if (err < 0) { 397 if (fcall && fcall->id == RWALK) 398 goto clunk_fid; 399 400 PRINT_FCALL_ERROR("walk error", fcall); 401 v9fs_put_idpool(nfid, &v9ses->fidpool); 402 goto error; 403 } 404 405 kfree(fcall); 406 fcall = NULL; 407 ret = v9fs_fid_create(v9ses, nfid); 408 if (!ret) { 409 err = -ENOMEM; 410 goto clunk_fid; 411 } 412 413 err = v9fs_fid_insert(ret, dentry); 414 if (err < 0) { 415 v9fs_fid_destroy(ret); 416 goto clunk_fid; 417 } 418 419 return ret; 420 421 clunk_fid: 422 v9fs_t_clunk(v9ses, nfid); 423 424 error: 425 kfree(fcall); 426 return ERR_PTR(err); 427 } 428 */ 429 430 431 /** 432 * v9fs_clear_inode - release an inode 433 * @inode: inode to release 434 * 435 */ 436 void v9fs_evict_inode(struct inode *inode) 437 { 438 struct v9fs_inode *v9inode = V9FS_I(inode); 439 440 truncate_inode_pages(inode->i_mapping, 0); 441 end_writeback(inode); 442 filemap_fdatawrite(inode->i_mapping); 443 444 #ifdef CONFIG_9P_FSCACHE 445 v9fs_cache_inode_put_cookie(inode); 446 #endif 447 /* clunk the fid stashed in writeback_fid */ 448 if (v9inode->writeback_fid) { 449 p9_client_clunk(v9inode->writeback_fid); 450 v9inode->writeback_fid = NULL; 451 } 452 } 453 454 static int v9fs_test_inode(struct inode *inode, void *data) 455 { 456 int umode; 457 dev_t rdev; 458 struct v9fs_inode *v9inode = V9FS_I(inode); 459 struct p9_wstat *st = (struct p9_wstat *)data; 460 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 461 462 umode = p9mode2unixmode(v9ses, st, &rdev); 463 /* don't match inode of different type */ 464 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 465 return 0; 466 467 /* compare qid details */ 468 if (memcmp(&v9inode->qid.version, 469 &st->qid.version, sizeof(v9inode->qid.version))) 470 return 0; 471 472 if (v9inode->qid.type != st->qid.type) 473 return 0; 474 return 1; 475 } 476 477 static int v9fs_test_new_inode(struct inode *inode, void *data) 478 { 479 return 0; 480 } 481 482 static int v9fs_set_inode(struct inode *inode, void *data) 483 { 484 struct v9fs_inode *v9inode = V9FS_I(inode); 485 struct p9_wstat *st = (struct p9_wstat *)data; 486 487 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 488 return 0; 489 } 490 491 static struct inode *v9fs_qid_iget(struct super_block *sb, 492 struct p9_qid *qid, 493 struct p9_wstat *st, 494 int new) 495 { 496 dev_t rdev; 497 int retval, umode; 498 unsigned long i_ino; 499 struct inode *inode; 500 struct v9fs_session_info *v9ses = sb->s_fs_info; 501 int (*test)(struct inode *, void *); 502 503 if (new) 504 test = v9fs_test_new_inode; 505 else 506 test = v9fs_test_inode; 507 508 i_ino = v9fs_qid2ino(qid); 509 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 510 if (!inode) 511 return ERR_PTR(-ENOMEM); 512 if (!(inode->i_state & I_NEW)) 513 return inode; 514 /* 515 * initialize the inode with the stat info 516 * FIXME!! we may need support for stale inodes 517 * later. 518 */ 519 inode->i_ino = i_ino; 520 umode = p9mode2unixmode(v9ses, st, &rdev); 521 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 522 if (retval) 523 goto error; 524 525 v9fs_stat2inode(st, inode, sb); 526 #ifdef CONFIG_9P_FSCACHE 527 v9fs_cache_inode_get_cookie(inode); 528 #endif 529 unlock_new_inode(inode); 530 return inode; 531 error: 532 unlock_new_inode(inode); 533 iput(inode); 534 return ERR_PTR(retval); 535 536 } 537 538 struct inode * 539 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 540 struct super_block *sb, int new) 541 { 542 struct p9_wstat *st; 543 struct inode *inode = NULL; 544 545 st = p9_client_stat(fid); 546 if (IS_ERR(st)) 547 return ERR_CAST(st); 548 549 inode = v9fs_qid_iget(sb, &st->qid, st, new); 550 p9stat_free(st); 551 kfree(st); 552 return inode; 553 } 554 555 /** 556 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 557 * plan 9 AT flag. 558 * @flags: flags to convert 559 */ 560 static int v9fs_at_to_dotl_flags(int flags) 561 { 562 int rflags = 0; 563 if (flags & AT_REMOVEDIR) 564 rflags |= P9_DOTL_AT_REMOVEDIR; 565 return rflags; 566 } 567 568 /** 569 * v9fs_remove - helper function to remove files and directories 570 * @dir: directory inode that is being deleted 571 * @dentry: dentry that is being deleted 572 * @rmdir: removing a directory 573 * 574 */ 575 576 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 577 { 578 struct inode *inode; 579 int retval = -EOPNOTSUPP; 580 struct p9_fid *v9fid, *dfid; 581 struct v9fs_session_info *v9ses; 582 583 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 584 dir, dentry, flags); 585 586 v9ses = v9fs_inode2v9ses(dir); 587 inode = dentry->d_inode; 588 dfid = v9fs_fid_lookup(dentry->d_parent); 589 if (IS_ERR(dfid)) { 590 retval = PTR_ERR(dfid); 591 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 592 return retval; 593 } 594 if (v9fs_proto_dotl(v9ses)) 595 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 596 v9fs_at_to_dotl_flags(flags)); 597 if (retval == -EOPNOTSUPP) { 598 /* Try the one based on path */ 599 v9fid = v9fs_fid_clone(dentry); 600 if (IS_ERR(v9fid)) 601 return PTR_ERR(v9fid); 602 retval = p9_client_remove(v9fid); 603 } 604 if (!retval) { 605 /* 606 * directories on unlink should have zero 607 * link count 608 */ 609 if (flags & AT_REMOVEDIR) { 610 clear_nlink(inode); 611 drop_nlink(dir); 612 } else 613 drop_nlink(inode); 614 615 v9fs_invalidate_inode_attr(inode); 616 v9fs_invalidate_inode_attr(dir); 617 } 618 return retval; 619 } 620 621 /** 622 * v9fs_create - Create a file 623 * @v9ses: session information 624 * @dir: directory that dentry is being created in 625 * @dentry: dentry that is being created 626 * @extension: 9p2000.u extension string to support devices, etc. 627 * @perm: create permissions 628 * @mode: open mode 629 * 630 */ 631 static struct p9_fid * 632 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 633 struct dentry *dentry, char *extension, u32 perm, u8 mode) 634 { 635 int err; 636 char *name; 637 struct p9_fid *dfid, *ofid, *fid; 638 struct inode *inode; 639 640 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 641 642 err = 0; 643 ofid = NULL; 644 fid = NULL; 645 name = (char *) dentry->d_name.name; 646 dfid = v9fs_fid_lookup(dentry->d_parent); 647 if (IS_ERR(dfid)) { 648 err = PTR_ERR(dfid); 649 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 650 return ERR_PTR(err); 651 } 652 653 /* clone a fid to use for creation */ 654 ofid = p9_client_walk(dfid, 0, NULL, 1); 655 if (IS_ERR(ofid)) { 656 err = PTR_ERR(ofid); 657 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 658 return ERR_PTR(err); 659 } 660 661 err = p9_client_fcreate(ofid, name, perm, mode, extension); 662 if (err < 0) { 663 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 664 goto error; 665 } 666 667 /* now walk from the parent so we can get unopened fid */ 668 fid = p9_client_walk(dfid, 1, &name, 1); 669 if (IS_ERR(fid)) { 670 err = PTR_ERR(fid); 671 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 672 fid = NULL; 673 goto error; 674 } 675 676 /* instantiate inode and assign the unopened fid to the dentry */ 677 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 678 if (IS_ERR(inode)) { 679 err = PTR_ERR(inode); 680 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 681 goto error; 682 } 683 err = v9fs_fid_add(dentry, fid); 684 if (err < 0) 685 goto error; 686 d_instantiate(dentry, inode); 687 return ofid; 688 error: 689 if (ofid) 690 p9_client_clunk(ofid); 691 692 if (fid) 693 p9_client_clunk(fid); 694 695 return ERR_PTR(err); 696 } 697 698 /** 699 * v9fs_vfs_create - VFS hook to create files 700 * @dir: directory inode that is being created 701 * @dentry: dentry that is being deleted 702 * @mode: create permissions 703 * @nd: path information 704 * 705 */ 706 707 static int 708 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 709 struct nameidata *nd) 710 { 711 int err; 712 u32 perm; 713 int flags; 714 struct file *filp; 715 struct v9fs_inode *v9inode; 716 struct v9fs_session_info *v9ses; 717 struct p9_fid *fid, *inode_fid; 718 719 err = 0; 720 fid = NULL; 721 v9ses = v9fs_inode2v9ses(dir); 722 perm = unixmode2p9mode(v9ses, mode); 723 if (nd) 724 flags = nd->intent.open.flags; 725 else 726 flags = O_RDWR; 727 728 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 729 v9fs_uflags2omode(flags, 730 v9fs_proto_dotu(v9ses))); 731 if (IS_ERR(fid)) { 732 err = PTR_ERR(fid); 733 fid = NULL; 734 goto error; 735 } 736 737 v9fs_invalidate_inode_attr(dir); 738 /* if we are opening a file, assign the open fid to the file */ 739 if (nd) { 740 v9inode = V9FS_I(dentry->d_inode); 741 mutex_lock(&v9inode->v_mutex); 742 if (v9ses->cache && !v9inode->writeback_fid && 743 ((flags & O_ACCMODE) != O_RDONLY)) { 744 /* 745 * clone a fid and add it to writeback_fid 746 * we do it during open time instead of 747 * page dirty time via write_begin/page_mkwrite 748 * because we want write after unlink usecase 749 * to work. 750 */ 751 inode_fid = v9fs_writeback_fid(dentry); 752 if (IS_ERR(inode_fid)) { 753 err = PTR_ERR(inode_fid); 754 mutex_unlock(&v9inode->v_mutex); 755 goto error; 756 } 757 v9inode->writeback_fid = (void *) inode_fid; 758 } 759 mutex_unlock(&v9inode->v_mutex); 760 filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 761 if (IS_ERR(filp)) { 762 err = PTR_ERR(filp); 763 goto error; 764 } 765 766 filp->private_data = fid; 767 #ifdef CONFIG_9P_FSCACHE 768 if (v9ses->cache) 769 v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 770 #endif 771 } else 772 p9_client_clunk(fid); 773 774 return 0; 775 776 error: 777 if (fid) 778 p9_client_clunk(fid); 779 780 return err; 781 } 782 783 /** 784 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 785 * @dir: inode that is being unlinked 786 * @dentry: dentry that is being unlinked 787 * @mode: mode for new directory 788 * 789 */ 790 791 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 792 { 793 int err; 794 u32 perm; 795 struct p9_fid *fid; 796 struct v9fs_session_info *v9ses; 797 798 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 799 err = 0; 800 v9ses = v9fs_inode2v9ses(dir); 801 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 802 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 803 if (IS_ERR(fid)) { 804 err = PTR_ERR(fid); 805 fid = NULL; 806 } else { 807 inc_nlink(dir); 808 v9fs_invalidate_inode_attr(dir); 809 } 810 811 if (fid) 812 p9_client_clunk(fid); 813 814 return err; 815 } 816 817 /** 818 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 819 * @dir: inode that is being walked from 820 * @dentry: dentry that is being walked to? 821 * @nameidata: path data 822 * 823 */ 824 825 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 826 struct nameidata *nameidata) 827 { 828 struct dentry *res; 829 struct super_block *sb; 830 struct v9fs_session_info *v9ses; 831 struct p9_fid *dfid, *fid; 832 struct inode *inode; 833 char *name; 834 int result = 0; 835 836 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 837 dir, dentry->d_name.name, dentry, nameidata); 838 839 if (dentry->d_name.len > NAME_MAX) 840 return ERR_PTR(-ENAMETOOLONG); 841 842 sb = dir->i_sb; 843 v9ses = v9fs_inode2v9ses(dir); 844 /* We can walk d_parent because we hold the dir->i_mutex */ 845 dfid = v9fs_fid_lookup(dentry->d_parent); 846 if (IS_ERR(dfid)) 847 return ERR_CAST(dfid); 848 849 name = (char *) dentry->d_name.name; 850 fid = p9_client_walk(dfid, 1, &name, 1); 851 if (IS_ERR(fid)) { 852 result = PTR_ERR(fid); 853 if (result == -ENOENT) { 854 inode = NULL; 855 goto inst_out; 856 } 857 858 return ERR_PTR(result); 859 } 860 /* 861 * Make sure we don't use a wrong inode due to parallel 862 * unlink. For cached mode create calls request for new 863 * inode. But with cache disabled, lookup should do this. 864 */ 865 if (v9ses->cache) 866 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 867 else 868 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 869 if (IS_ERR(inode)) { 870 result = PTR_ERR(inode); 871 inode = NULL; 872 goto error; 873 } 874 result = v9fs_fid_add(dentry, fid); 875 if (result < 0) 876 goto error_iput; 877 inst_out: 878 /* 879 * If we had a rename on the server and a parallel lookup 880 * for the new name, then make sure we instantiate with 881 * the new name. ie look up for a/b, while on server somebody 882 * moved b under k and client parallely did a lookup for 883 * k/b. 884 */ 885 res = d_materialise_unique(dentry, inode); 886 if (!IS_ERR(res)) 887 return res; 888 result = PTR_ERR(res); 889 error_iput: 890 iput(inode); 891 error: 892 p9_client_clunk(fid); 893 894 return ERR_PTR(result); 895 } 896 897 /** 898 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 899 * @i: inode that is being unlinked 900 * @d: dentry that is being unlinked 901 * 902 */ 903 904 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 905 { 906 return v9fs_remove(i, d, 0); 907 } 908 909 /** 910 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 911 * @i: inode that is being unlinked 912 * @d: dentry that is being unlinked 913 * 914 */ 915 916 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 917 { 918 return v9fs_remove(i, d, AT_REMOVEDIR); 919 } 920 921 /** 922 * v9fs_vfs_rename - VFS hook to rename an inode 923 * @old_dir: old dir inode 924 * @old_dentry: old dentry 925 * @new_dir: new dir inode 926 * @new_dentry: new dentry 927 * 928 */ 929 930 int 931 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 932 struct inode *new_dir, struct dentry *new_dentry) 933 { 934 int retval; 935 struct inode *old_inode; 936 struct inode *new_inode; 937 struct v9fs_session_info *v9ses; 938 struct p9_fid *oldfid; 939 struct p9_fid *olddirfid; 940 struct p9_fid *newdirfid; 941 struct p9_wstat wstat; 942 943 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 944 retval = 0; 945 old_inode = old_dentry->d_inode; 946 new_inode = new_dentry->d_inode; 947 v9ses = v9fs_inode2v9ses(old_inode); 948 oldfid = v9fs_fid_lookup(old_dentry); 949 if (IS_ERR(oldfid)) 950 return PTR_ERR(oldfid); 951 952 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 953 if (IS_ERR(olddirfid)) { 954 retval = PTR_ERR(olddirfid); 955 goto done; 956 } 957 958 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 959 if (IS_ERR(newdirfid)) { 960 retval = PTR_ERR(newdirfid); 961 goto clunk_olddir; 962 } 963 964 down_write(&v9ses->rename_sem); 965 if (v9fs_proto_dotl(v9ses)) { 966 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 967 newdirfid, new_dentry->d_name.name); 968 if (retval == -EOPNOTSUPP) 969 retval = p9_client_rename(oldfid, newdirfid, 970 new_dentry->d_name.name); 971 if (retval != -EOPNOTSUPP) 972 goto clunk_newdir; 973 } 974 if (old_dentry->d_parent != new_dentry->d_parent) { 975 /* 976 * 9P .u can only handle file rename in the same directory 977 */ 978 979 P9_DPRINTK(P9_DEBUG_ERROR, 980 "old dir and new dir are different\n"); 981 retval = -EXDEV; 982 goto clunk_newdir; 983 } 984 v9fs_blank_wstat(&wstat); 985 wstat.muid = v9ses->uname; 986 wstat.name = (char *) new_dentry->d_name.name; 987 retval = p9_client_wstat(oldfid, &wstat); 988 989 clunk_newdir: 990 if (!retval) { 991 if (new_inode) { 992 if (S_ISDIR(new_inode->i_mode)) 993 clear_nlink(new_inode); 994 else 995 drop_nlink(new_inode); 996 } 997 if (S_ISDIR(old_inode->i_mode)) { 998 if (!new_inode) 999 inc_nlink(new_dir); 1000 drop_nlink(old_dir); 1001 } 1002 v9fs_invalidate_inode_attr(old_inode); 1003 v9fs_invalidate_inode_attr(old_dir); 1004 v9fs_invalidate_inode_attr(new_dir); 1005 1006 /* successful rename */ 1007 d_move(old_dentry, new_dentry); 1008 } 1009 up_write(&v9ses->rename_sem); 1010 p9_client_clunk(newdirfid); 1011 1012 clunk_olddir: 1013 p9_client_clunk(olddirfid); 1014 1015 done: 1016 return retval; 1017 } 1018 1019 /** 1020 * v9fs_vfs_getattr - retrieve file metadata 1021 * @mnt: mount information 1022 * @dentry: file to get attributes on 1023 * @stat: metadata structure to populate 1024 * 1025 */ 1026 1027 static int 1028 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1029 struct kstat *stat) 1030 { 1031 int err; 1032 struct v9fs_session_info *v9ses; 1033 struct p9_fid *fid; 1034 struct p9_wstat *st; 1035 1036 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1037 err = -EPERM; 1038 v9ses = v9fs_dentry2v9ses(dentry); 1039 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1040 generic_fillattr(dentry->d_inode, stat); 1041 return 0; 1042 } 1043 fid = v9fs_fid_lookup(dentry); 1044 if (IS_ERR(fid)) 1045 return PTR_ERR(fid); 1046 1047 st = p9_client_stat(fid); 1048 if (IS_ERR(st)) 1049 return PTR_ERR(st); 1050 1051 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 1052 generic_fillattr(dentry->d_inode, stat); 1053 1054 p9stat_free(st); 1055 kfree(st); 1056 return 0; 1057 } 1058 1059 /** 1060 * v9fs_vfs_setattr - set file metadata 1061 * @dentry: file whose metadata to set 1062 * @iattr: metadata assignment structure 1063 * 1064 */ 1065 1066 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1067 { 1068 int retval; 1069 struct v9fs_session_info *v9ses; 1070 struct p9_fid *fid; 1071 struct p9_wstat wstat; 1072 1073 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 1074 retval = inode_change_ok(dentry->d_inode, iattr); 1075 if (retval) 1076 return retval; 1077 1078 retval = -EPERM; 1079 v9ses = v9fs_dentry2v9ses(dentry); 1080 fid = v9fs_fid_lookup(dentry); 1081 if(IS_ERR(fid)) 1082 return PTR_ERR(fid); 1083 1084 v9fs_blank_wstat(&wstat); 1085 if (iattr->ia_valid & ATTR_MODE) 1086 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1087 1088 if (iattr->ia_valid & ATTR_MTIME) 1089 wstat.mtime = iattr->ia_mtime.tv_sec; 1090 1091 if (iattr->ia_valid & ATTR_ATIME) 1092 wstat.atime = iattr->ia_atime.tv_sec; 1093 1094 if (iattr->ia_valid & ATTR_SIZE) 1095 wstat.length = iattr->ia_size; 1096 1097 if (v9fs_proto_dotu(v9ses)) { 1098 if (iattr->ia_valid & ATTR_UID) 1099 wstat.n_uid = iattr->ia_uid; 1100 1101 if (iattr->ia_valid & ATTR_GID) 1102 wstat.n_gid = iattr->ia_gid; 1103 } 1104 1105 /* Write all dirty data */ 1106 if (S_ISREG(dentry->d_inode->i_mode)) 1107 filemap_write_and_wait(dentry->d_inode->i_mapping); 1108 1109 retval = p9_client_wstat(fid, &wstat); 1110 if (retval < 0) 1111 return retval; 1112 1113 if ((iattr->ia_valid & ATTR_SIZE) && 1114 iattr->ia_size != i_size_read(dentry->d_inode)) 1115 truncate_setsize(dentry->d_inode, iattr->ia_size); 1116 1117 v9fs_invalidate_inode_attr(dentry->d_inode); 1118 1119 setattr_copy(dentry->d_inode, iattr); 1120 mark_inode_dirty(dentry->d_inode); 1121 return 0; 1122 } 1123 1124 /** 1125 * v9fs_stat2inode - populate an inode structure with mistat info 1126 * @stat: Plan 9 metadata (mistat) structure 1127 * @inode: inode to populate 1128 * @sb: superblock of filesystem 1129 * 1130 */ 1131 1132 void 1133 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1134 struct super_block *sb) 1135 { 1136 mode_t mode; 1137 char ext[32]; 1138 char tag_name[14]; 1139 unsigned int i_nlink; 1140 struct v9fs_session_info *v9ses = sb->s_fs_info; 1141 struct v9fs_inode *v9inode = V9FS_I(inode); 1142 1143 inode->i_nlink = 1; 1144 1145 inode->i_atime.tv_sec = stat->atime; 1146 inode->i_mtime.tv_sec = stat->mtime; 1147 inode->i_ctime.tv_sec = stat->mtime; 1148 1149 inode->i_uid = v9ses->dfltuid; 1150 inode->i_gid = v9ses->dfltgid; 1151 1152 if (v9fs_proto_dotu(v9ses)) { 1153 inode->i_uid = stat->n_uid; 1154 inode->i_gid = stat->n_gid; 1155 } 1156 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1157 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1158 /* 1159 * Hadlink support got added later to 1160 * to the .u extension. So there can be 1161 * server out there that doesn't support 1162 * this even with .u extension. So check 1163 * for non NULL stat->extension 1164 */ 1165 strncpy(ext, stat->extension, sizeof(ext)); 1166 /* HARDLINKCOUNT %u */ 1167 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1168 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1169 inode->i_nlink = i_nlink; 1170 } 1171 } 1172 mode = stat->mode & S_IALLUGO; 1173 mode |= inode->i_mode & ~S_IALLUGO; 1174 inode->i_mode = mode; 1175 i_size_write(inode, stat->length); 1176 1177 /* not real number of blocks, but 512 byte ones ... */ 1178 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1179 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1180 } 1181 1182 /** 1183 * v9fs_qid2ino - convert qid into inode number 1184 * @qid: qid to hash 1185 * 1186 * BUG: potential for inode number collisions? 1187 */ 1188 1189 ino_t v9fs_qid2ino(struct p9_qid *qid) 1190 { 1191 u64 path = qid->path + 2; 1192 ino_t i = 0; 1193 1194 if (sizeof(ino_t) == sizeof(path)) 1195 memcpy(&i, &path, sizeof(ino_t)); 1196 else 1197 i = (ino_t) (path ^ (path >> 32)); 1198 1199 return i; 1200 } 1201 1202 /** 1203 * v9fs_readlink - read a symlink's location (internal version) 1204 * @dentry: dentry for symlink 1205 * @buffer: buffer to load symlink location into 1206 * @buflen: length of buffer 1207 * 1208 */ 1209 1210 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1211 { 1212 int retval; 1213 1214 struct v9fs_session_info *v9ses; 1215 struct p9_fid *fid; 1216 struct p9_wstat *st; 1217 1218 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1219 retval = -EPERM; 1220 v9ses = v9fs_dentry2v9ses(dentry); 1221 fid = v9fs_fid_lookup(dentry); 1222 if (IS_ERR(fid)) 1223 return PTR_ERR(fid); 1224 1225 if (!v9fs_proto_dotu(v9ses)) 1226 return -EBADF; 1227 1228 st = p9_client_stat(fid); 1229 if (IS_ERR(st)) 1230 return PTR_ERR(st); 1231 1232 if (!(st->mode & P9_DMSYMLINK)) { 1233 retval = -EINVAL; 1234 goto done; 1235 } 1236 1237 /* copy extension buffer into buffer */ 1238 strncpy(buffer, st->extension, buflen); 1239 1240 P9_DPRINTK(P9_DEBUG_VFS, 1241 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, buffer); 1242 1243 retval = strnlen(buffer, buflen); 1244 done: 1245 p9stat_free(st); 1246 kfree(st); 1247 return retval; 1248 } 1249 1250 /** 1251 * v9fs_vfs_follow_link - follow a symlink path 1252 * @dentry: dentry for symlink 1253 * @nd: nameidata 1254 * 1255 */ 1256 1257 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1258 { 1259 int len = 0; 1260 char *link = __getname(); 1261 1262 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 1263 1264 if (!link) 1265 link = ERR_PTR(-ENOMEM); 1266 else { 1267 len = v9fs_readlink(dentry, link, PATH_MAX); 1268 1269 if (len < 0) { 1270 __putname(link); 1271 link = ERR_PTR(len); 1272 } else 1273 link[min(len, PATH_MAX-1)] = 0; 1274 } 1275 nd_set_link(nd, link); 1276 1277 return NULL; 1278 } 1279 1280 /** 1281 * v9fs_vfs_put_link - release a symlink path 1282 * @dentry: dentry for symlink 1283 * @nd: nameidata 1284 * @p: unused 1285 * 1286 */ 1287 1288 void 1289 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1290 { 1291 char *s = nd_get_link(nd); 1292 1293 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, 1294 IS_ERR(s) ? "<error>" : s); 1295 if (!IS_ERR(s)) 1296 __putname(s); 1297 } 1298 1299 /** 1300 * v9fs_vfs_mkspecial - create a special file 1301 * @dir: inode to create special file in 1302 * @dentry: dentry to create 1303 * @mode: mode to create special file 1304 * @extension: 9p2000.u format extension string representing special file 1305 * 1306 */ 1307 1308 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1309 int mode, const char *extension) 1310 { 1311 u32 perm; 1312 struct p9_fid *fid; 1313 struct v9fs_session_info *v9ses; 1314 1315 v9ses = v9fs_inode2v9ses(dir); 1316 if (!v9fs_proto_dotu(v9ses)) { 1317 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 1318 return -EPERM; 1319 } 1320 1321 perm = unixmode2p9mode(v9ses, mode); 1322 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1323 P9_OREAD); 1324 if (IS_ERR(fid)) 1325 return PTR_ERR(fid); 1326 1327 v9fs_invalidate_inode_attr(dir); 1328 p9_client_clunk(fid); 1329 return 0; 1330 } 1331 1332 /** 1333 * v9fs_vfs_symlink - helper function to create symlinks 1334 * @dir: directory inode containing symlink 1335 * @dentry: dentry for symlink 1336 * @symname: symlink data 1337 * 1338 * See Also: 9P2000.u RFC for more information 1339 * 1340 */ 1341 1342 static int 1343 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1344 { 1345 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1346 dentry->d_name.name, symname); 1347 1348 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1349 } 1350 1351 /** 1352 * v9fs_vfs_link - create a hardlink 1353 * @old_dentry: dentry for file to link to 1354 * @dir: inode destination for new link 1355 * @dentry: dentry for link 1356 * 1357 */ 1358 1359 static int 1360 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1361 struct dentry *dentry) 1362 { 1363 int retval; 1364 char *name; 1365 struct p9_fid *oldfid; 1366 1367 P9_DPRINTK(P9_DEBUG_VFS, 1368 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1369 old_dentry->d_name.name); 1370 1371 oldfid = v9fs_fid_clone(old_dentry); 1372 if (IS_ERR(oldfid)) 1373 return PTR_ERR(oldfid); 1374 1375 name = __getname(); 1376 if (unlikely(!name)) { 1377 retval = -ENOMEM; 1378 goto clunk_fid; 1379 } 1380 1381 sprintf(name, "%d\n", oldfid->fid); 1382 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1383 __putname(name); 1384 if (!retval) { 1385 v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1386 v9fs_invalidate_inode_attr(dir); 1387 } 1388 clunk_fid: 1389 p9_client_clunk(oldfid); 1390 return retval; 1391 } 1392 1393 /** 1394 * v9fs_vfs_mknod - create a special file 1395 * @dir: inode destination for new link 1396 * @dentry: dentry for file 1397 * @mode: mode for creation 1398 * @rdev: device associated with special file 1399 * 1400 */ 1401 1402 static int 1403 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1404 { 1405 int retval; 1406 char *name; 1407 1408 P9_DPRINTK(P9_DEBUG_VFS, 1409 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1410 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1411 1412 if (!new_valid_dev(rdev)) 1413 return -EINVAL; 1414 1415 name = __getname(); 1416 if (!name) 1417 return -ENOMEM; 1418 /* build extension */ 1419 if (S_ISBLK(mode)) 1420 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1421 else if (S_ISCHR(mode)) 1422 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1423 else if (S_ISFIFO(mode)) 1424 *name = 0; 1425 else if (S_ISSOCK(mode)) 1426 *name = 0; 1427 else { 1428 __putname(name); 1429 return -EINVAL; 1430 } 1431 1432 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1433 __putname(name); 1434 1435 return retval; 1436 } 1437 1438 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1439 { 1440 int umode; 1441 dev_t rdev; 1442 loff_t i_size; 1443 struct p9_wstat *st; 1444 struct v9fs_session_info *v9ses; 1445 1446 v9ses = v9fs_inode2v9ses(inode); 1447 st = p9_client_stat(fid); 1448 if (IS_ERR(st)) 1449 return PTR_ERR(st); 1450 /* 1451 * Don't update inode if the file type is different 1452 */ 1453 umode = p9mode2unixmode(v9ses, st, &rdev); 1454 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1455 goto out; 1456 1457 spin_lock(&inode->i_lock); 1458 /* 1459 * We don't want to refresh inode->i_size, 1460 * because we may have cached data 1461 */ 1462 i_size = inode->i_size; 1463 v9fs_stat2inode(st, inode, inode->i_sb); 1464 if (v9ses->cache) 1465 inode->i_size = i_size; 1466 spin_unlock(&inode->i_lock); 1467 out: 1468 p9stat_free(st); 1469 kfree(st); 1470 return 0; 1471 } 1472 1473 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1474 .create = v9fs_vfs_create, 1475 .lookup = v9fs_vfs_lookup, 1476 .symlink = v9fs_vfs_symlink, 1477 .link = v9fs_vfs_link, 1478 .unlink = v9fs_vfs_unlink, 1479 .mkdir = v9fs_vfs_mkdir, 1480 .rmdir = v9fs_vfs_rmdir, 1481 .mknod = v9fs_vfs_mknod, 1482 .rename = v9fs_vfs_rename, 1483 .getattr = v9fs_vfs_getattr, 1484 .setattr = v9fs_vfs_setattr, 1485 }; 1486 1487 static const struct inode_operations v9fs_dir_inode_operations = { 1488 .create = v9fs_vfs_create, 1489 .lookup = v9fs_vfs_lookup, 1490 .unlink = v9fs_vfs_unlink, 1491 .mkdir = v9fs_vfs_mkdir, 1492 .rmdir = v9fs_vfs_rmdir, 1493 .mknod = v9fs_vfs_mknod, 1494 .rename = v9fs_vfs_rename, 1495 .getattr = v9fs_vfs_getattr, 1496 .setattr = v9fs_vfs_setattr, 1497 }; 1498 1499 static const struct inode_operations v9fs_file_inode_operations = { 1500 .getattr = v9fs_vfs_getattr, 1501 .setattr = v9fs_vfs_setattr, 1502 }; 1503 1504 static const struct inode_operations v9fs_symlink_inode_operations = { 1505 .readlink = generic_readlink, 1506 .follow_link = v9fs_vfs_follow_link, 1507 .put_link = v9fs_vfs_put_link, 1508 .getattr = v9fs_vfs_getattr, 1509 .setattr = v9fs_vfs_setattr, 1510 }; 1511 1512