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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 27 28 #include <linux/module.h> 29 #include <linux/errno.h> 30 #include <linux/fs.h> 31 #include <linux/file.h> 32 #include <linux/pagemap.h> 33 #include <linux/stat.h> 34 #include <linux/string.h> 35 #include <linux/inet.h> 36 #include <linux/namei.h> 37 #include <linux/idr.h> 38 #include <linux/sched.h> 39 #include <linux/slab.h> 40 #include <linux/xattr.h> 41 #include <linux/posix_acl.h> 42 #include <net/9p/9p.h> 43 #include <net/9p/client.h> 44 45 #include "v9fs.h" 46 #include "v9fs_vfs.h" 47 #include "fid.h" 48 #include "cache.h" 49 #include "xattr.h" 50 #include "acl.h" 51 52 static const struct inode_operations v9fs_dir_inode_operations; 53 static const struct inode_operations v9fs_dir_inode_operations_dotu; 54 static const struct inode_operations v9fs_file_inode_operations; 55 static const struct inode_operations v9fs_symlink_inode_operations; 56 57 /** 58 * unixmode2p9mode - convert unix mode bits to plan 9 59 * @v9ses: v9fs session information 60 * @mode: mode to convert 61 * 62 */ 63 64 static u32 unixmode2p9mode(struct v9fs_session_info *v9ses, umode_t mode) 65 { 66 int res; 67 res = mode & 0777; 68 if (S_ISDIR(mode)) 69 res |= P9_DMDIR; 70 if (v9fs_proto_dotu(v9ses)) { 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 } 89 return res; 90 } 91 92 /** 93 * p9mode2perm- convert plan9 mode bits to unix permission bits 94 * @v9ses: v9fs session information 95 * @stat: p9_wstat from which mode need to be derived 96 * 97 */ 98 static int p9mode2perm(struct v9fs_session_info *v9ses, 99 struct p9_wstat *stat) 100 { 101 int res; 102 int mode = stat->mode; 103 104 res = mode & S_IALLUGO; 105 if (v9fs_proto_dotu(v9ses)) { 106 if ((mode & P9_DMSETUID) == P9_DMSETUID) 107 res |= S_ISUID; 108 109 if ((mode & P9_DMSETGID) == P9_DMSETGID) 110 res |= S_ISGID; 111 112 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 113 res |= S_ISVTX; 114 } 115 return res; 116 } 117 118 /** 119 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 120 * @v9ses: v9fs session information 121 * @stat: p9_wstat from which mode need to be derived 122 * @rdev: major number, minor number in case of device files. 123 * 124 */ 125 static umode_t p9mode2unixmode(struct v9fs_session_info *v9ses, 126 struct p9_wstat *stat, dev_t *rdev) 127 { 128 int res; 129 u32 mode = stat->mode; 130 131 *rdev = 0; 132 res = p9mode2perm(v9ses, stat); 133 134 if ((mode & P9_DMDIR) == P9_DMDIR) 135 res |= S_IFDIR; 136 else if ((mode & P9_DMSYMLINK) && (v9fs_proto_dotu(v9ses))) 137 res |= S_IFLNK; 138 else if ((mode & P9_DMSOCKET) && (v9fs_proto_dotu(v9ses)) 139 && (v9ses->nodev == 0)) 140 res |= S_IFSOCK; 141 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_proto_dotu(v9ses)) 142 && (v9ses->nodev == 0)) 143 res |= S_IFIFO; 144 else if ((mode & P9_DMDEVICE) && (v9fs_proto_dotu(v9ses)) 145 && (v9ses->nodev == 0)) { 146 char type = 0, ext[32]; 147 int major = -1, minor = -1; 148 149 strncpy(ext, stat->extension, sizeof(ext)); 150 sscanf(ext, "%c %u %u", &type, &major, &minor); 151 switch (type) { 152 case 'c': 153 res |= S_IFCHR; 154 break; 155 case 'b': 156 res |= S_IFBLK; 157 break; 158 default: 159 p9_debug(P9_DEBUG_ERROR, "Unknown special type %c %s\n", 160 type, stat->extension); 161 }; 162 *rdev = MKDEV(major, minor); 163 } else 164 res |= S_IFREG; 165 166 return res; 167 } 168 169 /** 170 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 171 * @uflags: flags to convert 172 * @extended: if .u extensions are active 173 */ 174 175 int v9fs_uflags2omode(int uflags, int extended) 176 { 177 int ret; 178 179 ret = 0; 180 switch (uflags&3) { 181 default: 182 case O_RDONLY: 183 ret = P9_OREAD; 184 break; 185 186 case O_WRONLY: 187 ret = P9_OWRITE; 188 break; 189 190 case O_RDWR: 191 ret = P9_ORDWR; 192 break; 193 } 194 195 if (uflags & O_TRUNC) 196 ret |= P9_OTRUNC; 197 198 if (extended) { 199 if (uflags & O_EXCL) 200 ret |= P9_OEXCL; 201 202 if (uflags & O_APPEND) 203 ret |= P9_OAPPEND; 204 } 205 206 return ret; 207 } 208 209 /** 210 * v9fs_blank_wstat - helper function to setup a 9P stat structure 211 * @wstat: structure to initialize 212 * 213 */ 214 215 void 216 v9fs_blank_wstat(struct p9_wstat *wstat) 217 { 218 wstat->type = ~0; 219 wstat->dev = ~0; 220 wstat->qid.type = ~0; 221 wstat->qid.version = ~0; 222 *((long long *)&wstat->qid.path) = ~0; 223 wstat->mode = ~0; 224 wstat->atime = ~0; 225 wstat->mtime = ~0; 226 wstat->length = ~0; 227 wstat->name = NULL; 228 wstat->uid = NULL; 229 wstat->gid = NULL; 230 wstat->muid = NULL; 231 wstat->n_uid = ~0; 232 wstat->n_gid = ~0; 233 wstat->n_muid = ~0; 234 wstat->extension = NULL; 235 } 236 237 /** 238 * v9fs_alloc_inode - helper function to allocate an inode 239 * 240 */ 241 struct inode *v9fs_alloc_inode(struct super_block *sb) 242 { 243 struct v9fs_inode *v9inode; 244 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 245 GFP_KERNEL); 246 if (!v9inode) 247 return NULL; 248 #ifdef CONFIG_9P_FSCACHE 249 v9inode->fscache = NULL; 250 spin_lock_init(&v9inode->fscache_lock); 251 #endif 252 v9inode->writeback_fid = NULL; 253 v9inode->cache_validity = 0; 254 mutex_init(&v9inode->v_mutex); 255 return &v9inode->vfs_inode; 256 } 257 258 /** 259 * v9fs_destroy_inode - destroy an inode 260 * 261 */ 262 263 static void v9fs_i_callback(struct rcu_head *head) 264 { 265 struct inode *inode = container_of(head, struct inode, i_rcu); 266 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 267 } 268 269 void v9fs_destroy_inode(struct inode *inode) 270 { 271 call_rcu(&inode->i_rcu, v9fs_i_callback); 272 } 273 274 int v9fs_init_inode(struct v9fs_session_info *v9ses, 275 struct inode *inode, umode_t mode, dev_t rdev) 276 { 277 int err = 0; 278 279 inode_init_owner(inode, NULL, mode); 280 inode->i_blocks = 0; 281 inode->i_rdev = rdev; 282 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 283 inode->i_mapping->a_ops = &v9fs_addr_operations; 284 285 switch (mode & S_IFMT) { 286 case S_IFIFO: 287 case S_IFBLK: 288 case S_IFCHR: 289 case S_IFSOCK: 290 if (v9fs_proto_dotl(v9ses)) { 291 inode->i_op = &v9fs_file_inode_operations_dotl; 292 } else if (v9fs_proto_dotu(v9ses)) { 293 inode->i_op = &v9fs_file_inode_operations; 294 } else { 295 p9_debug(P9_DEBUG_ERROR, 296 "special files without extended mode\n"); 297 err = -EINVAL; 298 goto error; 299 } 300 init_special_inode(inode, inode->i_mode, inode->i_rdev); 301 break; 302 case S_IFREG: 303 if (v9fs_proto_dotl(v9ses)) { 304 inode->i_op = &v9fs_file_inode_operations_dotl; 305 if (v9ses->cache) 306 inode->i_fop = 307 &v9fs_cached_file_operations_dotl; 308 else 309 inode->i_fop = &v9fs_file_operations_dotl; 310 } else { 311 inode->i_op = &v9fs_file_inode_operations; 312 if (v9ses->cache) 313 inode->i_fop = &v9fs_cached_file_operations; 314 else 315 inode->i_fop = &v9fs_file_operations; 316 } 317 318 break; 319 case S_IFLNK: 320 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 321 p9_debug(P9_DEBUG_ERROR, 322 "extended modes used with legacy protocol\n"); 323 err = -EINVAL; 324 goto error; 325 } 326 327 if (v9fs_proto_dotl(v9ses)) 328 inode->i_op = &v9fs_symlink_inode_operations_dotl; 329 else 330 inode->i_op = &v9fs_symlink_inode_operations; 331 332 break; 333 case S_IFDIR: 334 inc_nlink(inode); 335 if (v9fs_proto_dotl(v9ses)) 336 inode->i_op = &v9fs_dir_inode_operations_dotl; 337 else if (v9fs_proto_dotu(v9ses)) 338 inode->i_op = &v9fs_dir_inode_operations_dotu; 339 else 340 inode->i_op = &v9fs_dir_inode_operations; 341 342 if (v9fs_proto_dotl(v9ses)) 343 inode->i_fop = &v9fs_dir_operations_dotl; 344 else 345 inode->i_fop = &v9fs_dir_operations; 346 347 break; 348 default: 349 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 350 mode, mode & S_IFMT); 351 err = -EINVAL; 352 goto error; 353 } 354 error: 355 return err; 356 357 } 358 359 /** 360 * v9fs_get_inode - helper function to setup an inode 361 * @sb: superblock 362 * @mode: mode to setup inode with 363 * 364 */ 365 366 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 367 { 368 int err; 369 struct inode *inode; 370 struct v9fs_session_info *v9ses = sb->s_fs_info; 371 372 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 373 374 inode = new_inode(sb); 375 if (!inode) { 376 pr_warn("%s (%d): Problem allocating inode\n", 377 __func__, task_pid_nr(current)); 378 return ERR_PTR(-ENOMEM); 379 } 380 err = v9fs_init_inode(v9ses, inode, mode, rdev); 381 if (err) { 382 iput(inode); 383 return ERR_PTR(err); 384 } 385 return inode; 386 } 387 388 /* 389 static struct v9fs_fid* 390 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 391 { 392 int err; 393 int nfid; 394 struct v9fs_fid *ret; 395 struct v9fs_fcall *fcall; 396 397 nfid = v9fs_get_idpool(&v9ses->fidpool); 398 if (nfid < 0) { 399 eprintk(KERN_WARNING, "no free fids available\n"); 400 return ERR_PTR(-ENOSPC); 401 } 402 403 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 404 &fcall); 405 406 if (err < 0) { 407 if (fcall && fcall->id == RWALK) 408 goto clunk_fid; 409 410 PRINT_FCALL_ERROR("walk error", fcall); 411 v9fs_put_idpool(nfid, &v9ses->fidpool); 412 goto error; 413 } 414 415 kfree(fcall); 416 fcall = NULL; 417 ret = v9fs_fid_create(v9ses, nfid); 418 if (!ret) { 419 err = -ENOMEM; 420 goto clunk_fid; 421 } 422 423 err = v9fs_fid_insert(ret, dentry); 424 if (err < 0) { 425 v9fs_fid_destroy(ret); 426 goto clunk_fid; 427 } 428 429 return ret; 430 431 clunk_fid: 432 v9fs_t_clunk(v9ses, nfid); 433 434 error: 435 kfree(fcall); 436 return ERR_PTR(err); 437 } 438 */ 439 440 441 /** 442 * v9fs_clear_inode - release an inode 443 * @inode: inode to release 444 * 445 */ 446 void v9fs_evict_inode(struct inode *inode) 447 { 448 struct v9fs_inode *v9inode = V9FS_I(inode); 449 450 truncate_inode_pages(inode->i_mapping, 0); 451 end_writeback(inode); 452 filemap_fdatawrite(inode->i_mapping); 453 454 #ifdef CONFIG_9P_FSCACHE 455 v9fs_cache_inode_put_cookie(inode); 456 #endif 457 /* clunk the fid stashed in writeback_fid */ 458 if (v9inode->writeback_fid) { 459 p9_client_clunk(v9inode->writeback_fid); 460 v9inode->writeback_fid = NULL; 461 } 462 } 463 464 static int v9fs_test_inode(struct inode *inode, void *data) 465 { 466 int umode; 467 dev_t rdev; 468 struct v9fs_inode *v9inode = V9FS_I(inode); 469 struct p9_wstat *st = (struct p9_wstat *)data; 470 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 471 472 umode = p9mode2unixmode(v9ses, st, &rdev); 473 /* don't match inode of different type */ 474 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 475 return 0; 476 477 /* compare qid details */ 478 if (memcmp(&v9inode->qid.version, 479 &st->qid.version, sizeof(v9inode->qid.version))) 480 return 0; 481 482 if (v9inode->qid.type != st->qid.type) 483 return 0; 484 return 1; 485 } 486 487 static int v9fs_test_new_inode(struct inode *inode, void *data) 488 { 489 return 0; 490 } 491 492 static int v9fs_set_inode(struct inode *inode, void *data) 493 { 494 struct v9fs_inode *v9inode = V9FS_I(inode); 495 struct p9_wstat *st = (struct p9_wstat *)data; 496 497 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 498 return 0; 499 } 500 501 static struct inode *v9fs_qid_iget(struct super_block *sb, 502 struct p9_qid *qid, 503 struct p9_wstat *st, 504 int new) 505 { 506 dev_t rdev; 507 int retval; 508 umode_t umode; 509 unsigned long i_ino; 510 struct inode *inode; 511 struct v9fs_session_info *v9ses = sb->s_fs_info; 512 int (*test)(struct inode *, void *); 513 514 if (new) 515 test = v9fs_test_new_inode; 516 else 517 test = v9fs_test_inode; 518 519 i_ino = v9fs_qid2ino(qid); 520 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 521 if (!inode) 522 return ERR_PTR(-ENOMEM); 523 if (!(inode->i_state & I_NEW)) 524 return inode; 525 /* 526 * initialize the inode with the stat info 527 * FIXME!! we may need support for stale inodes 528 * later. 529 */ 530 inode->i_ino = i_ino; 531 umode = p9mode2unixmode(v9ses, st, &rdev); 532 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 533 if (retval) 534 goto error; 535 536 v9fs_stat2inode(st, inode, sb); 537 #ifdef CONFIG_9P_FSCACHE 538 v9fs_cache_inode_get_cookie(inode); 539 #endif 540 unlock_new_inode(inode); 541 return inode; 542 error: 543 unlock_new_inode(inode); 544 iput(inode); 545 return ERR_PTR(retval); 546 547 } 548 549 struct inode * 550 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 551 struct super_block *sb, int new) 552 { 553 struct p9_wstat *st; 554 struct inode *inode = NULL; 555 556 st = p9_client_stat(fid); 557 if (IS_ERR(st)) 558 return ERR_CAST(st); 559 560 inode = v9fs_qid_iget(sb, &st->qid, st, new); 561 p9stat_free(st); 562 kfree(st); 563 return inode; 564 } 565 566 /** 567 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 568 * plan 9 AT flag. 569 * @flags: flags to convert 570 */ 571 static int v9fs_at_to_dotl_flags(int flags) 572 { 573 int rflags = 0; 574 if (flags & AT_REMOVEDIR) 575 rflags |= P9_DOTL_AT_REMOVEDIR; 576 return rflags; 577 } 578 579 /** 580 * v9fs_remove - helper function to remove files and directories 581 * @dir: directory inode that is being deleted 582 * @dentry: dentry that is being deleted 583 * @rmdir: removing a directory 584 * 585 */ 586 587 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 588 { 589 struct inode *inode; 590 int retval = -EOPNOTSUPP; 591 struct p9_fid *v9fid, *dfid; 592 struct v9fs_session_info *v9ses; 593 594 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 595 dir, dentry, flags); 596 597 v9ses = v9fs_inode2v9ses(dir); 598 inode = dentry->d_inode; 599 dfid = v9fs_fid_lookup(dentry->d_parent); 600 if (IS_ERR(dfid)) { 601 retval = PTR_ERR(dfid); 602 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 603 return retval; 604 } 605 if (v9fs_proto_dotl(v9ses)) 606 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 607 v9fs_at_to_dotl_flags(flags)); 608 if (retval == -EOPNOTSUPP) { 609 /* Try the one based on path */ 610 v9fid = v9fs_fid_clone(dentry); 611 if (IS_ERR(v9fid)) 612 return PTR_ERR(v9fid); 613 retval = p9_client_remove(v9fid); 614 } 615 if (!retval) { 616 /* 617 * directories on unlink should have zero 618 * link count 619 */ 620 if (flags & AT_REMOVEDIR) { 621 clear_nlink(inode); 622 drop_nlink(dir); 623 } else 624 drop_nlink(inode); 625 626 v9fs_invalidate_inode_attr(inode); 627 v9fs_invalidate_inode_attr(dir); 628 } 629 return retval; 630 } 631 632 /** 633 * v9fs_create - Create a file 634 * @v9ses: session information 635 * @dir: directory that dentry is being created in 636 * @dentry: dentry that is being created 637 * @extension: 9p2000.u extension string to support devices, etc. 638 * @perm: create permissions 639 * @mode: open mode 640 * 641 */ 642 static struct p9_fid * 643 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 644 struct dentry *dentry, char *extension, u32 perm, u8 mode) 645 { 646 int err; 647 char *name; 648 struct p9_fid *dfid, *ofid, *fid; 649 struct inode *inode; 650 651 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 652 653 err = 0; 654 ofid = NULL; 655 fid = NULL; 656 name = (char *) dentry->d_name.name; 657 dfid = v9fs_fid_lookup(dentry->d_parent); 658 if (IS_ERR(dfid)) { 659 err = PTR_ERR(dfid); 660 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 661 return ERR_PTR(err); 662 } 663 664 /* clone a fid to use for creation */ 665 ofid = p9_client_walk(dfid, 0, NULL, 1); 666 if (IS_ERR(ofid)) { 667 err = PTR_ERR(ofid); 668 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 669 return ERR_PTR(err); 670 } 671 672 err = p9_client_fcreate(ofid, name, perm, mode, extension); 673 if (err < 0) { 674 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 675 goto error; 676 } 677 678 if (!(perm & P9_DMLINK)) { 679 /* now walk from the parent so we can get unopened fid */ 680 fid = p9_client_walk(dfid, 1, &name, 1); 681 if (IS_ERR(fid)) { 682 err = PTR_ERR(fid); 683 p9_debug(P9_DEBUG_VFS, 684 "p9_client_walk failed %d\n", err); 685 fid = NULL; 686 goto error; 687 } 688 /* 689 * instantiate inode and assign the unopened fid to the dentry 690 */ 691 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 692 if (IS_ERR(inode)) { 693 err = PTR_ERR(inode); 694 p9_debug(P9_DEBUG_VFS, 695 "inode creation failed %d\n", err); 696 goto error; 697 } 698 err = v9fs_fid_add(dentry, fid); 699 if (err < 0) 700 goto error; 701 d_instantiate(dentry, inode); 702 } 703 return ofid; 704 error: 705 if (ofid) 706 p9_client_clunk(ofid); 707 708 if (fid) 709 p9_client_clunk(fid); 710 711 return ERR_PTR(err); 712 } 713 714 /** 715 * v9fs_vfs_create - VFS hook to create files 716 * @dir: directory inode that is being created 717 * @dentry: dentry that is being deleted 718 * @mode: create permissions 719 * @nd: path information 720 * 721 */ 722 723 static int 724 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 725 struct nameidata *nd) 726 { 727 int err; 728 u32 perm; 729 int flags; 730 struct file *filp; 731 struct v9fs_inode *v9inode; 732 struct v9fs_session_info *v9ses; 733 struct p9_fid *fid, *inode_fid; 734 735 err = 0; 736 fid = NULL; 737 v9ses = v9fs_inode2v9ses(dir); 738 perm = unixmode2p9mode(v9ses, mode); 739 if (nd) 740 flags = nd->intent.open.flags; 741 else 742 flags = O_RDWR; 743 744 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 745 v9fs_uflags2omode(flags, 746 v9fs_proto_dotu(v9ses))); 747 if (IS_ERR(fid)) { 748 err = PTR_ERR(fid); 749 fid = NULL; 750 goto error; 751 } 752 753 v9fs_invalidate_inode_attr(dir); 754 /* if we are opening a file, assign the open fid to the file */ 755 if (nd) { 756 v9inode = V9FS_I(dentry->d_inode); 757 mutex_lock(&v9inode->v_mutex); 758 if (v9ses->cache && !v9inode->writeback_fid && 759 ((flags & O_ACCMODE) != O_RDONLY)) { 760 /* 761 * clone a fid and add it to writeback_fid 762 * we do it during open time instead of 763 * page dirty time via write_begin/page_mkwrite 764 * because we want write after unlink usecase 765 * to work. 766 */ 767 inode_fid = v9fs_writeback_fid(dentry); 768 if (IS_ERR(inode_fid)) { 769 err = PTR_ERR(inode_fid); 770 mutex_unlock(&v9inode->v_mutex); 771 goto error; 772 } 773 v9inode->writeback_fid = (void *) inode_fid; 774 } 775 mutex_unlock(&v9inode->v_mutex); 776 filp = lookup_instantiate_filp(nd, dentry, generic_file_open); 777 if (IS_ERR(filp)) { 778 err = PTR_ERR(filp); 779 goto error; 780 } 781 782 filp->private_data = fid; 783 #ifdef CONFIG_9P_FSCACHE 784 if (v9ses->cache) 785 v9fs_cache_inode_set_cookie(dentry->d_inode, filp); 786 #endif 787 } else 788 p9_client_clunk(fid); 789 790 return 0; 791 792 error: 793 if (fid) 794 p9_client_clunk(fid); 795 796 return err; 797 } 798 799 /** 800 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 801 * @dir: inode that is being unlinked 802 * @dentry: dentry that is being unlinked 803 * @mode: mode for new directory 804 * 805 */ 806 807 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 808 { 809 int err; 810 u32 perm; 811 struct p9_fid *fid; 812 struct v9fs_session_info *v9ses; 813 814 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 815 err = 0; 816 v9ses = v9fs_inode2v9ses(dir); 817 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 818 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 819 if (IS_ERR(fid)) { 820 err = PTR_ERR(fid); 821 fid = NULL; 822 } else { 823 inc_nlink(dir); 824 v9fs_invalidate_inode_attr(dir); 825 } 826 827 if (fid) 828 p9_client_clunk(fid); 829 830 return err; 831 } 832 833 /** 834 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 835 * @dir: inode that is being walked from 836 * @dentry: dentry that is being walked to? 837 * @nameidata: path data 838 * 839 */ 840 841 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 842 struct nameidata *nameidata) 843 { 844 struct dentry *res; 845 struct super_block *sb; 846 struct v9fs_session_info *v9ses; 847 struct p9_fid *dfid, *fid; 848 struct inode *inode; 849 char *name; 850 int result = 0; 851 852 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 853 dir, dentry->d_name.name, dentry, nameidata); 854 855 if (dentry->d_name.len > NAME_MAX) 856 return ERR_PTR(-ENAMETOOLONG); 857 858 sb = dir->i_sb; 859 v9ses = v9fs_inode2v9ses(dir); 860 /* We can walk d_parent because we hold the dir->i_mutex */ 861 dfid = v9fs_fid_lookup(dentry->d_parent); 862 if (IS_ERR(dfid)) 863 return ERR_CAST(dfid); 864 865 name = (char *) dentry->d_name.name; 866 fid = p9_client_walk(dfid, 1, &name, 1); 867 if (IS_ERR(fid)) { 868 result = PTR_ERR(fid); 869 if (result == -ENOENT) { 870 inode = NULL; 871 goto inst_out; 872 } 873 874 return ERR_PTR(result); 875 } 876 /* 877 * Make sure we don't use a wrong inode due to parallel 878 * unlink. For cached mode create calls request for new 879 * inode. But with cache disabled, lookup should do this. 880 */ 881 if (v9ses->cache) 882 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 883 else 884 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 885 if (IS_ERR(inode)) { 886 result = PTR_ERR(inode); 887 inode = NULL; 888 goto error; 889 } 890 result = v9fs_fid_add(dentry, fid); 891 if (result < 0) 892 goto error_iput; 893 inst_out: 894 /* 895 * If we had a rename on the server and a parallel lookup 896 * for the new name, then make sure we instantiate with 897 * the new name. ie look up for a/b, while on server somebody 898 * moved b under k and client parallely did a lookup for 899 * k/b. 900 */ 901 res = d_materialise_unique(dentry, inode); 902 if (!IS_ERR(res)) 903 return res; 904 result = PTR_ERR(res); 905 error_iput: 906 iput(inode); 907 error: 908 p9_client_clunk(fid); 909 910 return ERR_PTR(result); 911 } 912 913 /** 914 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 915 * @i: inode that is being unlinked 916 * @d: dentry that is being unlinked 917 * 918 */ 919 920 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 921 { 922 return v9fs_remove(i, d, 0); 923 } 924 925 /** 926 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 927 * @i: inode that is being unlinked 928 * @d: dentry that is being unlinked 929 * 930 */ 931 932 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 933 { 934 return v9fs_remove(i, d, AT_REMOVEDIR); 935 } 936 937 /** 938 * v9fs_vfs_rename - VFS hook to rename an inode 939 * @old_dir: old dir inode 940 * @old_dentry: old dentry 941 * @new_dir: new dir inode 942 * @new_dentry: new dentry 943 * 944 */ 945 946 int 947 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 948 struct inode *new_dir, struct dentry *new_dentry) 949 { 950 int retval; 951 struct inode *old_inode; 952 struct inode *new_inode; 953 struct v9fs_session_info *v9ses; 954 struct p9_fid *oldfid; 955 struct p9_fid *olddirfid; 956 struct p9_fid *newdirfid; 957 struct p9_wstat wstat; 958 959 p9_debug(P9_DEBUG_VFS, "\n"); 960 retval = 0; 961 old_inode = old_dentry->d_inode; 962 new_inode = new_dentry->d_inode; 963 v9ses = v9fs_inode2v9ses(old_inode); 964 oldfid = v9fs_fid_lookup(old_dentry); 965 if (IS_ERR(oldfid)) 966 return PTR_ERR(oldfid); 967 968 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 969 if (IS_ERR(olddirfid)) { 970 retval = PTR_ERR(olddirfid); 971 goto done; 972 } 973 974 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 975 if (IS_ERR(newdirfid)) { 976 retval = PTR_ERR(newdirfid); 977 goto clunk_olddir; 978 } 979 980 down_write(&v9ses->rename_sem); 981 if (v9fs_proto_dotl(v9ses)) { 982 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 983 newdirfid, new_dentry->d_name.name); 984 if (retval == -EOPNOTSUPP) 985 retval = p9_client_rename(oldfid, newdirfid, 986 new_dentry->d_name.name); 987 if (retval != -EOPNOTSUPP) 988 goto clunk_newdir; 989 } 990 if (old_dentry->d_parent != new_dentry->d_parent) { 991 /* 992 * 9P .u can only handle file rename in the same directory 993 */ 994 995 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 996 retval = -EXDEV; 997 goto clunk_newdir; 998 } 999 v9fs_blank_wstat(&wstat); 1000 wstat.muid = v9ses->uname; 1001 wstat.name = (char *) new_dentry->d_name.name; 1002 retval = p9_client_wstat(oldfid, &wstat); 1003 1004 clunk_newdir: 1005 if (!retval) { 1006 if (new_inode) { 1007 if (S_ISDIR(new_inode->i_mode)) 1008 clear_nlink(new_inode); 1009 else 1010 drop_nlink(new_inode); 1011 } 1012 if (S_ISDIR(old_inode->i_mode)) { 1013 if (!new_inode) 1014 inc_nlink(new_dir); 1015 drop_nlink(old_dir); 1016 } 1017 v9fs_invalidate_inode_attr(old_inode); 1018 v9fs_invalidate_inode_attr(old_dir); 1019 v9fs_invalidate_inode_attr(new_dir); 1020 1021 /* successful rename */ 1022 d_move(old_dentry, new_dentry); 1023 } 1024 up_write(&v9ses->rename_sem); 1025 p9_client_clunk(newdirfid); 1026 1027 clunk_olddir: 1028 p9_client_clunk(olddirfid); 1029 1030 done: 1031 return retval; 1032 } 1033 1034 /** 1035 * v9fs_vfs_getattr - retrieve file metadata 1036 * @mnt: mount information 1037 * @dentry: file to get attributes on 1038 * @stat: metadata structure to populate 1039 * 1040 */ 1041 1042 static int 1043 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1044 struct kstat *stat) 1045 { 1046 int err; 1047 struct v9fs_session_info *v9ses; 1048 struct p9_fid *fid; 1049 struct p9_wstat *st; 1050 1051 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1052 err = -EPERM; 1053 v9ses = v9fs_dentry2v9ses(dentry); 1054 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1055 generic_fillattr(dentry->d_inode, stat); 1056 return 0; 1057 } 1058 fid = v9fs_fid_lookup(dentry); 1059 if (IS_ERR(fid)) 1060 return PTR_ERR(fid); 1061 1062 st = p9_client_stat(fid); 1063 if (IS_ERR(st)) 1064 return PTR_ERR(st); 1065 1066 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 1067 generic_fillattr(dentry->d_inode, stat); 1068 1069 p9stat_free(st); 1070 kfree(st); 1071 return 0; 1072 } 1073 1074 /** 1075 * v9fs_vfs_setattr - set file metadata 1076 * @dentry: file whose metadata to set 1077 * @iattr: metadata assignment structure 1078 * 1079 */ 1080 1081 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1082 { 1083 int retval; 1084 struct v9fs_session_info *v9ses; 1085 struct p9_fid *fid; 1086 struct p9_wstat wstat; 1087 1088 p9_debug(P9_DEBUG_VFS, "\n"); 1089 retval = inode_change_ok(dentry->d_inode, iattr); 1090 if (retval) 1091 return retval; 1092 1093 retval = -EPERM; 1094 v9ses = v9fs_dentry2v9ses(dentry); 1095 fid = v9fs_fid_lookup(dentry); 1096 if(IS_ERR(fid)) 1097 return PTR_ERR(fid); 1098 1099 v9fs_blank_wstat(&wstat); 1100 if (iattr->ia_valid & ATTR_MODE) 1101 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1102 1103 if (iattr->ia_valid & ATTR_MTIME) 1104 wstat.mtime = iattr->ia_mtime.tv_sec; 1105 1106 if (iattr->ia_valid & ATTR_ATIME) 1107 wstat.atime = iattr->ia_atime.tv_sec; 1108 1109 if (iattr->ia_valid & ATTR_SIZE) 1110 wstat.length = iattr->ia_size; 1111 1112 if (v9fs_proto_dotu(v9ses)) { 1113 if (iattr->ia_valid & ATTR_UID) 1114 wstat.n_uid = iattr->ia_uid; 1115 1116 if (iattr->ia_valid & ATTR_GID) 1117 wstat.n_gid = iattr->ia_gid; 1118 } 1119 1120 /* Write all dirty data */ 1121 if (S_ISREG(dentry->d_inode->i_mode)) 1122 filemap_write_and_wait(dentry->d_inode->i_mapping); 1123 1124 retval = p9_client_wstat(fid, &wstat); 1125 if (retval < 0) 1126 return retval; 1127 1128 if ((iattr->ia_valid & ATTR_SIZE) && 1129 iattr->ia_size != i_size_read(dentry->d_inode)) 1130 truncate_setsize(dentry->d_inode, iattr->ia_size); 1131 1132 v9fs_invalidate_inode_attr(dentry->d_inode); 1133 1134 setattr_copy(dentry->d_inode, iattr); 1135 mark_inode_dirty(dentry->d_inode); 1136 return 0; 1137 } 1138 1139 /** 1140 * v9fs_stat2inode - populate an inode structure with mistat info 1141 * @stat: Plan 9 metadata (mistat) structure 1142 * @inode: inode to populate 1143 * @sb: superblock of filesystem 1144 * 1145 */ 1146 1147 void 1148 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1149 struct super_block *sb) 1150 { 1151 umode_t mode; 1152 char ext[32]; 1153 char tag_name[14]; 1154 unsigned int i_nlink; 1155 struct v9fs_session_info *v9ses = sb->s_fs_info; 1156 struct v9fs_inode *v9inode = V9FS_I(inode); 1157 1158 set_nlink(inode, 1); 1159 1160 inode->i_atime.tv_sec = stat->atime; 1161 inode->i_mtime.tv_sec = stat->mtime; 1162 inode->i_ctime.tv_sec = stat->mtime; 1163 1164 inode->i_uid = v9ses->dfltuid; 1165 inode->i_gid = v9ses->dfltgid; 1166 1167 if (v9fs_proto_dotu(v9ses)) { 1168 inode->i_uid = stat->n_uid; 1169 inode->i_gid = stat->n_gid; 1170 } 1171 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1172 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1173 /* 1174 * Hadlink support got added later to 1175 * to the .u extension. So there can be 1176 * server out there that doesn't support 1177 * this even with .u extension. So check 1178 * for non NULL stat->extension 1179 */ 1180 strncpy(ext, stat->extension, sizeof(ext)); 1181 /* HARDLINKCOUNT %u */ 1182 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1183 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1184 set_nlink(inode, i_nlink); 1185 } 1186 } 1187 mode = p9mode2perm(v9ses, stat); 1188 mode |= inode->i_mode & ~S_IALLUGO; 1189 inode->i_mode = mode; 1190 i_size_write(inode, stat->length); 1191 1192 /* not real number of blocks, but 512 byte ones ... */ 1193 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1194 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1195 } 1196 1197 /** 1198 * v9fs_qid2ino - convert qid into inode number 1199 * @qid: qid to hash 1200 * 1201 * BUG: potential for inode number collisions? 1202 */ 1203 1204 ino_t v9fs_qid2ino(struct p9_qid *qid) 1205 { 1206 u64 path = qid->path + 2; 1207 ino_t i = 0; 1208 1209 if (sizeof(ino_t) == sizeof(path)) 1210 memcpy(&i, &path, sizeof(ino_t)); 1211 else 1212 i = (ino_t) (path ^ (path >> 32)); 1213 1214 return i; 1215 } 1216 1217 /** 1218 * v9fs_readlink - read a symlink's location (internal version) 1219 * @dentry: dentry for symlink 1220 * @buffer: buffer to load symlink location into 1221 * @buflen: length of buffer 1222 * 1223 */ 1224 1225 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1226 { 1227 int retval; 1228 1229 struct v9fs_session_info *v9ses; 1230 struct p9_fid *fid; 1231 struct p9_wstat *st; 1232 1233 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1234 retval = -EPERM; 1235 v9ses = v9fs_dentry2v9ses(dentry); 1236 fid = v9fs_fid_lookup(dentry); 1237 if (IS_ERR(fid)) 1238 return PTR_ERR(fid); 1239 1240 if (!v9fs_proto_dotu(v9ses)) 1241 return -EBADF; 1242 1243 st = p9_client_stat(fid); 1244 if (IS_ERR(st)) 1245 return PTR_ERR(st); 1246 1247 if (!(st->mode & P9_DMSYMLINK)) { 1248 retval = -EINVAL; 1249 goto done; 1250 } 1251 1252 /* copy extension buffer into buffer */ 1253 strncpy(buffer, st->extension, buflen); 1254 1255 p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n", 1256 dentry->d_name.name, st->extension, buffer); 1257 1258 retval = strnlen(buffer, buflen); 1259 done: 1260 p9stat_free(st); 1261 kfree(st); 1262 return retval; 1263 } 1264 1265 /** 1266 * v9fs_vfs_follow_link - follow a symlink path 1267 * @dentry: dentry for symlink 1268 * @nd: nameidata 1269 * 1270 */ 1271 1272 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1273 { 1274 int len = 0; 1275 char *link = __getname(); 1276 1277 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 1278 1279 if (!link) 1280 link = ERR_PTR(-ENOMEM); 1281 else { 1282 len = v9fs_readlink(dentry, link, PATH_MAX); 1283 1284 if (len < 0) { 1285 __putname(link); 1286 link = ERR_PTR(len); 1287 } else 1288 link[min(len, PATH_MAX-1)] = 0; 1289 } 1290 nd_set_link(nd, link); 1291 1292 return NULL; 1293 } 1294 1295 /** 1296 * v9fs_vfs_put_link - release a symlink path 1297 * @dentry: dentry for symlink 1298 * @nd: nameidata 1299 * @p: unused 1300 * 1301 */ 1302 1303 void 1304 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1305 { 1306 char *s = nd_get_link(nd); 1307 1308 p9_debug(P9_DEBUG_VFS, " %s %s\n", 1309 dentry->d_name.name, IS_ERR(s) ? "<error>" : s); 1310 if (!IS_ERR(s)) 1311 __putname(s); 1312 } 1313 1314 /** 1315 * v9fs_vfs_mkspecial - create a special file 1316 * @dir: inode to create special file in 1317 * @dentry: dentry to create 1318 * @mode: mode to create special file 1319 * @extension: 9p2000.u format extension string representing special file 1320 * 1321 */ 1322 1323 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1324 u32 perm, const char *extension) 1325 { 1326 struct p9_fid *fid; 1327 struct v9fs_session_info *v9ses; 1328 1329 v9ses = v9fs_inode2v9ses(dir); 1330 if (!v9fs_proto_dotu(v9ses)) { 1331 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1332 return -EPERM; 1333 } 1334 1335 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1336 P9_OREAD); 1337 if (IS_ERR(fid)) 1338 return PTR_ERR(fid); 1339 1340 v9fs_invalidate_inode_attr(dir); 1341 p9_client_clunk(fid); 1342 return 0; 1343 } 1344 1345 /** 1346 * v9fs_vfs_symlink - helper function to create symlinks 1347 * @dir: directory inode containing symlink 1348 * @dentry: dentry for symlink 1349 * @symname: symlink data 1350 * 1351 * See Also: 9P2000.u RFC for more information 1352 * 1353 */ 1354 1355 static int 1356 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1357 { 1358 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 1359 dir->i_ino, dentry->d_name.name, symname); 1360 1361 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1362 } 1363 1364 /** 1365 * v9fs_vfs_link - create a hardlink 1366 * @old_dentry: dentry for file to link to 1367 * @dir: inode destination for new link 1368 * @dentry: dentry for link 1369 * 1370 */ 1371 1372 static int 1373 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1374 struct dentry *dentry) 1375 { 1376 int retval; 1377 char *name; 1378 struct p9_fid *oldfid; 1379 1380 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 1381 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name); 1382 1383 oldfid = v9fs_fid_clone(old_dentry); 1384 if (IS_ERR(oldfid)) 1385 return PTR_ERR(oldfid); 1386 1387 name = __getname(); 1388 if (unlikely(!name)) { 1389 retval = -ENOMEM; 1390 goto clunk_fid; 1391 } 1392 1393 sprintf(name, "%d\n", oldfid->fid); 1394 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1395 __putname(name); 1396 if (!retval) { 1397 v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1398 v9fs_invalidate_inode_attr(dir); 1399 } 1400 clunk_fid: 1401 p9_client_clunk(oldfid); 1402 return retval; 1403 } 1404 1405 /** 1406 * v9fs_vfs_mknod - create a special file 1407 * @dir: inode destination for new link 1408 * @dentry: dentry for file 1409 * @mode: mode for creation 1410 * @rdev: device associated with special file 1411 * 1412 */ 1413 1414 static int 1415 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1416 { 1417 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1418 int retval; 1419 char *name; 1420 u32 perm; 1421 1422 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 1423 dir->i_ino, dentry->d_name.name, mode, 1424 MAJOR(rdev), MINOR(rdev)); 1425 1426 if (!new_valid_dev(rdev)) 1427 return -EINVAL; 1428 1429 name = __getname(); 1430 if (!name) 1431 return -ENOMEM; 1432 /* build extension */ 1433 if (S_ISBLK(mode)) 1434 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1435 else if (S_ISCHR(mode)) 1436 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1437 else if (S_ISFIFO(mode)) 1438 *name = 0; 1439 else if (S_ISSOCK(mode)) 1440 *name = 0; 1441 else { 1442 __putname(name); 1443 return -EINVAL; 1444 } 1445 1446 perm = unixmode2p9mode(v9ses, mode); 1447 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1448 __putname(name); 1449 1450 return retval; 1451 } 1452 1453 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1454 { 1455 int umode; 1456 dev_t rdev; 1457 loff_t i_size; 1458 struct p9_wstat *st; 1459 struct v9fs_session_info *v9ses; 1460 1461 v9ses = v9fs_inode2v9ses(inode); 1462 st = p9_client_stat(fid); 1463 if (IS_ERR(st)) 1464 return PTR_ERR(st); 1465 /* 1466 * Don't update inode if the file type is different 1467 */ 1468 umode = p9mode2unixmode(v9ses, st, &rdev); 1469 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1470 goto out; 1471 1472 spin_lock(&inode->i_lock); 1473 /* 1474 * We don't want to refresh inode->i_size, 1475 * because we may have cached data 1476 */ 1477 i_size = inode->i_size; 1478 v9fs_stat2inode(st, inode, inode->i_sb); 1479 if (v9ses->cache) 1480 inode->i_size = i_size; 1481 spin_unlock(&inode->i_lock); 1482 out: 1483 p9stat_free(st); 1484 kfree(st); 1485 return 0; 1486 } 1487 1488 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1489 .create = v9fs_vfs_create, 1490 .lookup = v9fs_vfs_lookup, 1491 .symlink = v9fs_vfs_symlink, 1492 .link = v9fs_vfs_link, 1493 .unlink = v9fs_vfs_unlink, 1494 .mkdir = v9fs_vfs_mkdir, 1495 .rmdir = v9fs_vfs_rmdir, 1496 .mknod = v9fs_vfs_mknod, 1497 .rename = v9fs_vfs_rename, 1498 .getattr = v9fs_vfs_getattr, 1499 .setattr = v9fs_vfs_setattr, 1500 }; 1501 1502 static const struct inode_operations v9fs_dir_inode_operations = { 1503 .create = v9fs_vfs_create, 1504 .lookup = v9fs_vfs_lookup, 1505 .unlink = v9fs_vfs_unlink, 1506 .mkdir = v9fs_vfs_mkdir, 1507 .rmdir = v9fs_vfs_rmdir, 1508 .mknod = v9fs_vfs_mknod, 1509 .rename = v9fs_vfs_rename, 1510 .getattr = v9fs_vfs_getattr, 1511 .setattr = v9fs_vfs_setattr, 1512 }; 1513 1514 static const struct inode_operations v9fs_file_inode_operations = { 1515 .getattr = v9fs_vfs_getattr, 1516 .setattr = v9fs_vfs_setattr, 1517 }; 1518 1519 static const struct inode_operations v9fs_symlink_inode_operations = { 1520 .readlink = generic_readlink, 1521 .follow_link = v9fs_vfs_follow_link, 1522 .put_link = v9fs_vfs_put_link, 1523 .getattr = v9fs_vfs_getattr, 1524 .setattr = v9fs_vfs_setattr, 1525 }; 1526 1527