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 strlcpy(ext, stat->extension, sizeof(ext)); 150 sscanf(ext, "%c %i %i", &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 (extended) { 196 if (uflags & O_EXCL) 197 ret |= P9_OEXCL; 198 199 if (uflags & O_APPEND) 200 ret |= P9_OAPPEND; 201 } 202 203 return ret; 204 } 205 206 /** 207 * v9fs_blank_wstat - helper function to setup a 9P stat structure 208 * @wstat: structure to initialize 209 * 210 */ 211 212 void 213 v9fs_blank_wstat(struct p9_wstat *wstat) 214 { 215 wstat->type = ~0; 216 wstat->dev = ~0; 217 wstat->qid.type = ~0; 218 wstat->qid.version = ~0; 219 *((long long *)&wstat->qid.path) = ~0; 220 wstat->mode = ~0; 221 wstat->atime = ~0; 222 wstat->mtime = ~0; 223 wstat->length = ~0; 224 wstat->name = NULL; 225 wstat->uid = NULL; 226 wstat->gid = NULL; 227 wstat->muid = NULL; 228 wstat->n_uid = INVALID_UID; 229 wstat->n_gid = INVALID_GID; 230 wstat->n_muid = INVALID_UID; 231 wstat->extension = NULL; 232 } 233 234 /** 235 * v9fs_alloc_inode - helper function to allocate an inode 236 * 237 */ 238 struct inode *v9fs_alloc_inode(struct super_block *sb) 239 { 240 struct v9fs_inode *v9inode; 241 v9inode = (struct v9fs_inode *)kmem_cache_alloc(v9fs_inode_cache, 242 GFP_KERNEL); 243 if (!v9inode) 244 return NULL; 245 #ifdef CONFIG_9P_FSCACHE 246 v9inode->fscache = NULL; 247 spin_lock_init(&v9inode->fscache_lock); 248 #endif 249 v9inode->writeback_fid = NULL; 250 v9inode->cache_validity = 0; 251 mutex_init(&v9inode->v_mutex); 252 return &v9inode->vfs_inode; 253 } 254 255 /** 256 * v9fs_destroy_inode - destroy an inode 257 * 258 */ 259 260 static void v9fs_i_callback(struct rcu_head *head) 261 { 262 struct inode *inode = container_of(head, struct inode, i_rcu); 263 kmem_cache_free(v9fs_inode_cache, V9FS_I(inode)); 264 } 265 266 void v9fs_destroy_inode(struct inode *inode) 267 { 268 call_rcu(&inode->i_rcu, v9fs_i_callback); 269 } 270 271 int v9fs_init_inode(struct v9fs_session_info *v9ses, 272 struct inode *inode, umode_t mode, dev_t rdev) 273 { 274 int err = 0; 275 276 inode_init_owner(inode, NULL, mode); 277 inode->i_blocks = 0; 278 inode->i_rdev = rdev; 279 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 280 inode->i_mapping->a_ops = &v9fs_addr_operations; 281 282 switch (mode & S_IFMT) { 283 case S_IFIFO: 284 case S_IFBLK: 285 case S_IFCHR: 286 case S_IFSOCK: 287 if (v9fs_proto_dotl(v9ses)) { 288 inode->i_op = &v9fs_file_inode_operations_dotl; 289 } else if (v9fs_proto_dotu(v9ses)) { 290 inode->i_op = &v9fs_file_inode_operations; 291 } else { 292 p9_debug(P9_DEBUG_ERROR, 293 "special files without extended mode\n"); 294 err = -EINVAL; 295 goto error; 296 } 297 init_special_inode(inode, inode->i_mode, inode->i_rdev); 298 break; 299 case S_IFREG: 300 if (v9fs_proto_dotl(v9ses)) { 301 inode->i_op = &v9fs_file_inode_operations_dotl; 302 if (v9ses->cache == CACHE_LOOSE || 303 v9ses->cache == CACHE_FSCACHE) 304 inode->i_fop = 305 &v9fs_cached_file_operations_dotl; 306 else if (v9ses->cache == CACHE_MMAP) 307 inode->i_fop = &v9fs_mmap_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 == CACHE_LOOSE || 313 v9ses->cache == CACHE_FSCACHE) 314 inode->i_fop = 315 &v9fs_cached_file_operations; 316 else if (v9ses->cache == CACHE_MMAP) 317 inode->i_fop = &v9fs_mmap_file_operations; 318 else 319 inode->i_fop = &v9fs_file_operations; 320 } 321 322 break; 323 case S_IFLNK: 324 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 325 p9_debug(P9_DEBUG_ERROR, 326 "extended modes used with legacy protocol\n"); 327 err = -EINVAL; 328 goto error; 329 } 330 331 if (v9fs_proto_dotl(v9ses)) 332 inode->i_op = &v9fs_symlink_inode_operations_dotl; 333 else 334 inode->i_op = &v9fs_symlink_inode_operations; 335 336 break; 337 case S_IFDIR: 338 inc_nlink(inode); 339 if (v9fs_proto_dotl(v9ses)) 340 inode->i_op = &v9fs_dir_inode_operations_dotl; 341 else if (v9fs_proto_dotu(v9ses)) 342 inode->i_op = &v9fs_dir_inode_operations_dotu; 343 else 344 inode->i_op = &v9fs_dir_inode_operations; 345 346 if (v9fs_proto_dotl(v9ses)) 347 inode->i_fop = &v9fs_dir_operations_dotl; 348 else 349 inode->i_fop = &v9fs_dir_operations; 350 351 break; 352 default: 353 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 354 mode, mode & S_IFMT); 355 err = -EINVAL; 356 goto error; 357 } 358 error: 359 return err; 360 361 } 362 363 /** 364 * v9fs_get_inode - helper function to setup an inode 365 * @sb: superblock 366 * @mode: mode to setup inode with 367 * 368 */ 369 370 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 371 { 372 int err; 373 struct inode *inode; 374 struct v9fs_session_info *v9ses = sb->s_fs_info; 375 376 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 377 378 inode = new_inode(sb); 379 if (!inode) { 380 pr_warn("%s (%d): Problem allocating inode\n", 381 __func__, task_pid_nr(current)); 382 return ERR_PTR(-ENOMEM); 383 } 384 err = v9fs_init_inode(v9ses, inode, mode, rdev); 385 if (err) { 386 iput(inode); 387 return ERR_PTR(err); 388 } 389 return inode; 390 } 391 392 /* 393 static struct v9fs_fid* 394 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 395 { 396 int err; 397 int nfid; 398 struct v9fs_fid *ret; 399 struct v9fs_fcall *fcall; 400 401 nfid = v9fs_get_idpool(&v9ses->fidpool); 402 if (nfid < 0) { 403 eprintk(KERN_WARNING, "no free fids available\n"); 404 return ERR_PTR(-ENOSPC); 405 } 406 407 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 408 &fcall); 409 410 if (err < 0) { 411 if (fcall && fcall->id == RWALK) 412 goto clunk_fid; 413 414 PRINT_FCALL_ERROR("walk error", fcall); 415 v9fs_put_idpool(nfid, &v9ses->fidpool); 416 goto error; 417 } 418 419 kfree(fcall); 420 fcall = NULL; 421 ret = v9fs_fid_create(v9ses, nfid); 422 if (!ret) { 423 err = -ENOMEM; 424 goto clunk_fid; 425 } 426 427 err = v9fs_fid_insert(ret, dentry); 428 if (err < 0) { 429 v9fs_fid_destroy(ret); 430 goto clunk_fid; 431 } 432 433 return ret; 434 435 clunk_fid: 436 v9fs_t_clunk(v9ses, nfid); 437 438 error: 439 kfree(fcall); 440 return ERR_PTR(err); 441 } 442 */ 443 444 445 /** 446 * v9fs_clear_inode - release an inode 447 * @inode: inode to release 448 * 449 */ 450 void v9fs_evict_inode(struct inode *inode) 451 { 452 struct v9fs_inode *v9inode = V9FS_I(inode); 453 454 truncate_inode_pages_final(inode->i_mapping); 455 clear_inode(inode); 456 filemap_fdatawrite(inode->i_mapping); 457 458 v9fs_cache_inode_put_cookie(inode); 459 /* clunk the fid stashed in writeback_fid */ 460 if (v9inode->writeback_fid) { 461 p9_client_clunk(v9inode->writeback_fid); 462 v9inode->writeback_fid = NULL; 463 } 464 } 465 466 static int v9fs_test_inode(struct inode *inode, void *data) 467 { 468 int umode; 469 dev_t rdev; 470 struct v9fs_inode *v9inode = V9FS_I(inode); 471 struct p9_wstat *st = (struct p9_wstat *)data; 472 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 473 474 umode = p9mode2unixmode(v9ses, st, &rdev); 475 /* don't match inode of different type */ 476 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 477 return 0; 478 479 /* compare qid details */ 480 if (memcmp(&v9inode->qid.version, 481 &st->qid.version, sizeof(v9inode->qid.version))) 482 return 0; 483 484 if (v9inode->qid.type != st->qid.type) 485 return 0; 486 return 1; 487 } 488 489 static int v9fs_test_new_inode(struct inode *inode, void *data) 490 { 491 return 0; 492 } 493 494 static int v9fs_set_inode(struct inode *inode, void *data) 495 { 496 struct v9fs_inode *v9inode = V9FS_I(inode); 497 struct p9_wstat *st = (struct p9_wstat *)data; 498 499 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 500 return 0; 501 } 502 503 static struct inode *v9fs_qid_iget(struct super_block *sb, 504 struct p9_qid *qid, 505 struct p9_wstat *st, 506 int new) 507 { 508 dev_t rdev; 509 int retval; 510 umode_t umode; 511 unsigned long i_ino; 512 struct inode *inode; 513 struct v9fs_session_info *v9ses = sb->s_fs_info; 514 int (*test)(struct inode *, void *); 515 516 if (new) 517 test = v9fs_test_new_inode; 518 else 519 test = v9fs_test_inode; 520 521 i_ino = v9fs_qid2ino(qid); 522 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 523 if (!inode) 524 return ERR_PTR(-ENOMEM); 525 if (!(inode->i_state & I_NEW)) 526 return inode; 527 /* 528 * initialize the inode with the stat info 529 * FIXME!! we may need support for stale inodes 530 * later. 531 */ 532 inode->i_ino = i_ino; 533 umode = p9mode2unixmode(v9ses, st, &rdev); 534 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 535 if (retval) 536 goto error; 537 538 v9fs_stat2inode(st, inode, sb); 539 v9fs_cache_inode_get_cookie(inode); 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 * @flags: 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 = d_inode(dentry); 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 %pd\n", dentry); 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 v9fs_fid_add(dentry, fid); 699 d_instantiate(dentry, inode); 700 } 701 return ofid; 702 error: 703 if (ofid) 704 p9_client_clunk(ofid); 705 706 if (fid) 707 p9_client_clunk(fid); 708 709 return ERR_PTR(err); 710 } 711 712 /** 713 * v9fs_vfs_create - VFS hook to create a regular file 714 * 715 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 716 * for mknod(2). 717 * 718 * @dir: directory inode that is being created 719 * @dentry: dentry that is being deleted 720 * @mode: create permissions 721 * 722 */ 723 724 static int 725 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 726 bool excl) 727 { 728 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 729 u32 perm = unixmode2p9mode(v9ses, mode); 730 struct p9_fid *fid; 731 732 /* P9_OEXCL? */ 733 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 734 if (IS_ERR(fid)) 735 return PTR_ERR(fid); 736 737 v9fs_invalidate_inode_attr(dir); 738 p9_client_clunk(fid); 739 740 return 0; 741 } 742 743 /** 744 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 745 * @dir: inode that is being unlinked 746 * @dentry: dentry that is being unlinked 747 * @mode: mode for new directory 748 * 749 */ 750 751 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 752 { 753 int err; 754 u32 perm; 755 struct p9_fid *fid; 756 struct v9fs_session_info *v9ses; 757 758 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 759 err = 0; 760 v9ses = v9fs_inode2v9ses(dir); 761 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 762 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 763 if (IS_ERR(fid)) { 764 err = PTR_ERR(fid); 765 fid = NULL; 766 } else { 767 inc_nlink(dir); 768 v9fs_invalidate_inode_attr(dir); 769 } 770 771 if (fid) 772 p9_client_clunk(fid); 773 774 return err; 775 } 776 777 /** 778 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 779 * @dir: inode that is being walked from 780 * @dentry: dentry that is being walked to? 781 * @flags: lookup flags (unused) 782 * 783 */ 784 785 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 786 unsigned int flags) 787 { 788 struct dentry *res; 789 struct v9fs_session_info *v9ses; 790 struct p9_fid *dfid, *fid; 791 struct inode *inode; 792 char *name; 793 794 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 795 dir, dentry, dentry, flags); 796 797 if (dentry->d_name.len > NAME_MAX) 798 return ERR_PTR(-ENAMETOOLONG); 799 800 v9ses = v9fs_inode2v9ses(dir); 801 /* We can walk d_parent because we hold the dir->i_mutex */ 802 dfid = v9fs_fid_lookup(dentry->d_parent); 803 if (IS_ERR(dfid)) 804 return ERR_CAST(dfid); 805 806 name = (char *) dentry->d_name.name; 807 fid = p9_client_walk(dfid, 1, &name, 1); 808 if (IS_ERR(fid)) { 809 if (fid == ERR_PTR(-ENOENT)) { 810 d_add(dentry, NULL); 811 return NULL; 812 } 813 return ERR_CAST(fid); 814 } 815 /* 816 * Make sure we don't use a wrong inode due to parallel 817 * unlink. For cached mode create calls request for new 818 * inode. But with cache disabled, lookup should do this. 819 */ 820 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 821 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 822 else 823 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 824 if (IS_ERR(inode)) { 825 p9_client_clunk(fid); 826 return ERR_CAST(inode); 827 } 828 /* 829 * If we had a rename on the server and a parallel lookup 830 * for the new name, then make sure we instantiate with 831 * the new name. ie look up for a/b, while on server somebody 832 * moved b under k and client parallely did a lookup for 833 * k/b. 834 */ 835 res = d_splice_alias(inode, dentry); 836 if (!res) 837 v9fs_fid_add(dentry, fid); 838 else if (!IS_ERR(res)) 839 v9fs_fid_add(res, fid); 840 else 841 p9_client_clunk(fid); 842 return res; 843 } 844 845 static int 846 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 847 struct file *file, unsigned flags, umode_t mode, 848 int *opened) 849 { 850 int err; 851 u32 perm; 852 struct v9fs_inode *v9inode; 853 struct v9fs_session_info *v9ses; 854 struct p9_fid *fid, *inode_fid; 855 struct dentry *res = NULL; 856 857 if (d_unhashed(dentry)) { 858 res = v9fs_vfs_lookup(dir, dentry, 0); 859 if (IS_ERR(res)) 860 return PTR_ERR(res); 861 862 if (res) 863 dentry = res; 864 } 865 866 /* Only creates */ 867 if (!(flags & O_CREAT) || d_really_is_positive(dentry)) 868 return finish_no_open(file, res); 869 870 err = 0; 871 872 v9ses = v9fs_inode2v9ses(dir); 873 perm = unixmode2p9mode(v9ses, mode); 874 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 875 v9fs_uflags2omode(flags, 876 v9fs_proto_dotu(v9ses))); 877 if (IS_ERR(fid)) { 878 err = PTR_ERR(fid); 879 fid = NULL; 880 goto error; 881 } 882 883 v9fs_invalidate_inode_attr(dir); 884 v9inode = V9FS_I(d_inode(dentry)); 885 mutex_lock(&v9inode->v_mutex); 886 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 887 !v9inode->writeback_fid && 888 ((flags & O_ACCMODE) != O_RDONLY)) { 889 /* 890 * clone a fid and add it to writeback_fid 891 * we do it during open time instead of 892 * page dirty time via write_begin/page_mkwrite 893 * because we want write after unlink usecase 894 * to work. 895 */ 896 inode_fid = v9fs_writeback_fid(dentry); 897 if (IS_ERR(inode_fid)) { 898 err = PTR_ERR(inode_fid); 899 mutex_unlock(&v9inode->v_mutex); 900 goto error; 901 } 902 v9inode->writeback_fid = (void *) inode_fid; 903 } 904 mutex_unlock(&v9inode->v_mutex); 905 err = finish_open(file, dentry, generic_file_open, opened); 906 if (err) 907 goto error; 908 909 file->private_data = fid; 910 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 911 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 912 913 *opened |= FILE_CREATED; 914 out: 915 dput(res); 916 return err; 917 918 error: 919 if (fid) 920 p9_client_clunk(fid); 921 goto out; 922 } 923 924 /** 925 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 926 * @i: inode that is being unlinked 927 * @d: dentry that is being unlinked 928 * 929 */ 930 931 int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 932 { 933 return v9fs_remove(i, d, 0); 934 } 935 936 /** 937 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 938 * @i: inode that is being unlinked 939 * @d: dentry that is being unlinked 940 * 941 */ 942 943 int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 944 { 945 return v9fs_remove(i, d, AT_REMOVEDIR); 946 } 947 948 /** 949 * v9fs_vfs_rename - VFS hook to rename an inode 950 * @old_dir: old dir inode 951 * @old_dentry: old dentry 952 * @new_dir: new dir inode 953 * @new_dentry: new dentry 954 * 955 */ 956 957 int 958 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 959 struct inode *new_dir, struct dentry *new_dentry) 960 { 961 int retval; 962 struct inode *old_inode; 963 struct inode *new_inode; 964 struct v9fs_session_info *v9ses; 965 struct p9_fid *oldfid; 966 struct p9_fid *olddirfid; 967 struct p9_fid *newdirfid; 968 struct p9_wstat wstat; 969 970 p9_debug(P9_DEBUG_VFS, "\n"); 971 retval = 0; 972 old_inode = d_inode(old_dentry); 973 new_inode = d_inode(new_dentry); 974 v9ses = v9fs_inode2v9ses(old_inode); 975 oldfid = v9fs_fid_lookup(old_dentry); 976 if (IS_ERR(oldfid)) 977 return PTR_ERR(oldfid); 978 979 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 980 if (IS_ERR(olddirfid)) { 981 retval = PTR_ERR(olddirfid); 982 goto done; 983 } 984 985 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 986 if (IS_ERR(newdirfid)) { 987 retval = PTR_ERR(newdirfid); 988 goto clunk_olddir; 989 } 990 991 down_write(&v9ses->rename_sem); 992 if (v9fs_proto_dotl(v9ses)) { 993 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 994 newdirfid, new_dentry->d_name.name); 995 if (retval == -EOPNOTSUPP) 996 retval = p9_client_rename(oldfid, newdirfid, 997 new_dentry->d_name.name); 998 if (retval != -EOPNOTSUPP) 999 goto clunk_newdir; 1000 } 1001 if (old_dentry->d_parent != new_dentry->d_parent) { 1002 /* 1003 * 9P .u can only handle file rename in the same directory 1004 */ 1005 1006 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1007 retval = -EXDEV; 1008 goto clunk_newdir; 1009 } 1010 v9fs_blank_wstat(&wstat); 1011 wstat.muid = v9ses->uname; 1012 wstat.name = (char *) new_dentry->d_name.name; 1013 retval = p9_client_wstat(oldfid, &wstat); 1014 1015 clunk_newdir: 1016 if (!retval) { 1017 if (new_inode) { 1018 if (S_ISDIR(new_inode->i_mode)) 1019 clear_nlink(new_inode); 1020 else 1021 drop_nlink(new_inode); 1022 } 1023 if (S_ISDIR(old_inode->i_mode)) { 1024 if (!new_inode) 1025 inc_nlink(new_dir); 1026 drop_nlink(old_dir); 1027 } 1028 v9fs_invalidate_inode_attr(old_inode); 1029 v9fs_invalidate_inode_attr(old_dir); 1030 v9fs_invalidate_inode_attr(new_dir); 1031 1032 /* successful rename */ 1033 d_move(old_dentry, new_dentry); 1034 } 1035 up_write(&v9ses->rename_sem); 1036 p9_client_clunk(newdirfid); 1037 1038 clunk_olddir: 1039 p9_client_clunk(olddirfid); 1040 1041 done: 1042 return retval; 1043 } 1044 1045 /** 1046 * v9fs_vfs_getattr - retrieve file metadata 1047 * @mnt: mount information 1048 * @dentry: file to get attributes on 1049 * @stat: metadata structure to populate 1050 * 1051 */ 1052 1053 static int 1054 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1055 struct kstat *stat) 1056 { 1057 struct v9fs_session_info *v9ses; 1058 struct p9_fid *fid; 1059 struct p9_wstat *st; 1060 1061 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1062 v9ses = v9fs_dentry2v9ses(dentry); 1063 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1064 generic_fillattr(d_inode(dentry), stat); 1065 return 0; 1066 } 1067 fid = v9fs_fid_lookup(dentry); 1068 if (IS_ERR(fid)) 1069 return PTR_ERR(fid); 1070 1071 st = p9_client_stat(fid); 1072 if (IS_ERR(st)) 1073 return PTR_ERR(st); 1074 1075 v9fs_stat2inode(st, d_inode(dentry), d_inode(dentry)->i_sb); 1076 generic_fillattr(d_inode(dentry), stat); 1077 1078 p9stat_free(st); 1079 kfree(st); 1080 return 0; 1081 } 1082 1083 /** 1084 * v9fs_vfs_setattr - set file metadata 1085 * @dentry: file whose metadata to set 1086 * @iattr: metadata assignment structure 1087 * 1088 */ 1089 1090 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1091 { 1092 int retval; 1093 struct v9fs_session_info *v9ses; 1094 struct p9_fid *fid; 1095 struct p9_wstat wstat; 1096 1097 p9_debug(P9_DEBUG_VFS, "\n"); 1098 retval = inode_change_ok(d_inode(dentry), iattr); 1099 if (retval) 1100 return retval; 1101 1102 retval = -EPERM; 1103 v9ses = v9fs_dentry2v9ses(dentry); 1104 fid = v9fs_fid_lookup(dentry); 1105 if(IS_ERR(fid)) 1106 return PTR_ERR(fid); 1107 1108 v9fs_blank_wstat(&wstat); 1109 if (iattr->ia_valid & ATTR_MODE) 1110 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1111 1112 if (iattr->ia_valid & ATTR_MTIME) 1113 wstat.mtime = iattr->ia_mtime.tv_sec; 1114 1115 if (iattr->ia_valid & ATTR_ATIME) 1116 wstat.atime = iattr->ia_atime.tv_sec; 1117 1118 if (iattr->ia_valid & ATTR_SIZE) 1119 wstat.length = iattr->ia_size; 1120 1121 if (v9fs_proto_dotu(v9ses)) { 1122 if (iattr->ia_valid & ATTR_UID) 1123 wstat.n_uid = iattr->ia_uid; 1124 1125 if (iattr->ia_valid & ATTR_GID) 1126 wstat.n_gid = iattr->ia_gid; 1127 } 1128 1129 /* Write all dirty data */ 1130 if (d_is_reg(dentry)) 1131 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1132 1133 retval = p9_client_wstat(fid, &wstat); 1134 if (retval < 0) 1135 return retval; 1136 1137 if ((iattr->ia_valid & ATTR_SIZE) && 1138 iattr->ia_size != i_size_read(d_inode(dentry))) 1139 truncate_setsize(d_inode(dentry), iattr->ia_size); 1140 1141 v9fs_invalidate_inode_attr(d_inode(dentry)); 1142 1143 setattr_copy(d_inode(dentry), iattr); 1144 mark_inode_dirty(d_inode(dentry)); 1145 return 0; 1146 } 1147 1148 /** 1149 * v9fs_stat2inode - populate an inode structure with mistat info 1150 * @stat: Plan 9 metadata (mistat) structure 1151 * @inode: inode to populate 1152 * @sb: superblock of filesystem 1153 * 1154 */ 1155 1156 void 1157 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1158 struct super_block *sb) 1159 { 1160 umode_t mode; 1161 char ext[32]; 1162 char tag_name[14]; 1163 unsigned int i_nlink; 1164 struct v9fs_session_info *v9ses = sb->s_fs_info; 1165 struct v9fs_inode *v9inode = V9FS_I(inode); 1166 1167 set_nlink(inode, 1); 1168 1169 inode->i_atime.tv_sec = stat->atime; 1170 inode->i_mtime.tv_sec = stat->mtime; 1171 inode->i_ctime.tv_sec = stat->mtime; 1172 1173 inode->i_uid = v9ses->dfltuid; 1174 inode->i_gid = v9ses->dfltgid; 1175 1176 if (v9fs_proto_dotu(v9ses)) { 1177 inode->i_uid = stat->n_uid; 1178 inode->i_gid = stat->n_gid; 1179 } 1180 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1181 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1182 /* 1183 * Hadlink support got added later to 1184 * to the .u extension. So there can be 1185 * server out there that doesn't support 1186 * this even with .u extension. So check 1187 * for non NULL stat->extension 1188 */ 1189 strlcpy(ext, stat->extension, sizeof(ext)); 1190 /* HARDLINKCOUNT %u */ 1191 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1192 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1193 set_nlink(inode, i_nlink); 1194 } 1195 } 1196 mode = p9mode2perm(v9ses, stat); 1197 mode |= inode->i_mode & ~S_IALLUGO; 1198 inode->i_mode = mode; 1199 i_size_write(inode, stat->length); 1200 1201 /* not real number of blocks, but 512 byte ones ... */ 1202 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1203 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1204 } 1205 1206 /** 1207 * v9fs_qid2ino - convert qid into inode number 1208 * @qid: qid to hash 1209 * 1210 * BUG: potential for inode number collisions? 1211 */ 1212 1213 ino_t v9fs_qid2ino(struct p9_qid *qid) 1214 { 1215 u64 path = qid->path + 2; 1216 ino_t i = 0; 1217 1218 if (sizeof(ino_t) == sizeof(path)) 1219 memcpy(&i, &path, sizeof(ino_t)); 1220 else 1221 i = (ino_t) (path ^ (path >> 32)); 1222 1223 return i; 1224 } 1225 1226 /** 1227 * v9fs_readlink - read a symlink's location (internal version) 1228 * @dentry: dentry for symlink 1229 * @buffer: buffer to load symlink location into 1230 * @buflen: length of buffer 1231 * 1232 */ 1233 1234 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1235 { 1236 int retval; 1237 1238 struct v9fs_session_info *v9ses; 1239 struct p9_fid *fid; 1240 struct p9_wstat *st; 1241 1242 p9_debug(P9_DEBUG_VFS, " %pd\n", dentry); 1243 retval = -EPERM; 1244 v9ses = v9fs_dentry2v9ses(dentry); 1245 fid = v9fs_fid_lookup(dentry); 1246 if (IS_ERR(fid)) 1247 return PTR_ERR(fid); 1248 1249 if (!v9fs_proto_dotu(v9ses)) 1250 return -EBADF; 1251 1252 st = p9_client_stat(fid); 1253 if (IS_ERR(st)) 1254 return PTR_ERR(st); 1255 1256 if (!(st->mode & P9_DMSYMLINK)) { 1257 retval = -EINVAL; 1258 goto done; 1259 } 1260 1261 /* copy extension buffer into buffer */ 1262 retval = min(strlen(st->extension)+1, (size_t)buflen); 1263 memcpy(buffer, st->extension, retval); 1264 1265 p9_debug(P9_DEBUG_VFS, "%pd -> %s (%.*s)\n", 1266 dentry, st->extension, buflen, buffer); 1267 1268 done: 1269 p9stat_free(st); 1270 kfree(st); 1271 return retval; 1272 } 1273 1274 /** 1275 * v9fs_vfs_follow_link - follow a symlink path 1276 * @dentry: dentry for symlink 1277 * @nd: nameidata 1278 * 1279 */ 1280 1281 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1282 { 1283 int len = 0; 1284 char *link = __getname(); 1285 1286 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1287 1288 if (!link) 1289 link = ERR_PTR(-ENOMEM); 1290 else { 1291 len = v9fs_readlink(dentry, link, PATH_MAX); 1292 1293 if (len < 0) { 1294 __putname(link); 1295 link = ERR_PTR(len); 1296 } else 1297 link[min(len, PATH_MAX-1)] = 0; 1298 } 1299 nd_set_link(nd, link); 1300 1301 return NULL; 1302 } 1303 1304 /** 1305 * v9fs_vfs_put_link - release a symlink path 1306 * @dentry: dentry for symlink 1307 * @nd: nameidata 1308 * @p: unused 1309 * 1310 */ 1311 1312 void 1313 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1314 { 1315 char *s = nd_get_link(nd); 1316 1317 p9_debug(P9_DEBUG_VFS, " %pd %s\n", 1318 dentry, IS_ERR(s) ? "<error>" : s); 1319 if (!IS_ERR(s)) 1320 __putname(s); 1321 } 1322 1323 /** 1324 * v9fs_vfs_mkspecial - create a special file 1325 * @dir: inode to create special file in 1326 * @dentry: dentry to create 1327 * @perm: mode to create special file 1328 * @extension: 9p2000.u format extension string representing special file 1329 * 1330 */ 1331 1332 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1333 u32 perm, const char *extension) 1334 { 1335 struct p9_fid *fid; 1336 struct v9fs_session_info *v9ses; 1337 1338 v9ses = v9fs_inode2v9ses(dir); 1339 if (!v9fs_proto_dotu(v9ses)) { 1340 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1341 return -EPERM; 1342 } 1343 1344 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1345 P9_OREAD); 1346 if (IS_ERR(fid)) 1347 return PTR_ERR(fid); 1348 1349 v9fs_invalidate_inode_attr(dir); 1350 p9_client_clunk(fid); 1351 return 0; 1352 } 1353 1354 /** 1355 * v9fs_vfs_symlink - helper function to create symlinks 1356 * @dir: directory inode containing symlink 1357 * @dentry: dentry for symlink 1358 * @symname: symlink data 1359 * 1360 * See Also: 9P2000.u RFC for more information 1361 * 1362 */ 1363 1364 static int 1365 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1366 { 1367 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1368 dir->i_ino, dentry, symname); 1369 1370 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1371 } 1372 1373 /** 1374 * v9fs_vfs_link - create a hardlink 1375 * @old_dentry: dentry for file to link to 1376 * @dir: inode destination for new link 1377 * @dentry: dentry for link 1378 * 1379 */ 1380 1381 static int 1382 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1383 struct dentry *dentry) 1384 { 1385 int retval; 1386 char *name; 1387 struct p9_fid *oldfid; 1388 1389 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1390 dir->i_ino, dentry, old_dentry); 1391 1392 oldfid = v9fs_fid_clone(old_dentry); 1393 if (IS_ERR(oldfid)) 1394 return PTR_ERR(oldfid); 1395 1396 name = __getname(); 1397 if (unlikely(!name)) { 1398 retval = -ENOMEM; 1399 goto clunk_fid; 1400 } 1401 1402 sprintf(name, "%d\n", oldfid->fid); 1403 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1404 __putname(name); 1405 if (!retval) { 1406 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1407 v9fs_invalidate_inode_attr(dir); 1408 } 1409 clunk_fid: 1410 p9_client_clunk(oldfid); 1411 return retval; 1412 } 1413 1414 /** 1415 * v9fs_vfs_mknod - create a special file 1416 * @dir: inode destination for new link 1417 * @dentry: dentry for file 1418 * @mode: mode for creation 1419 * @rdev: device associated with special file 1420 * 1421 */ 1422 1423 static int 1424 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1425 { 1426 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1427 int retval; 1428 char *name; 1429 u32 perm; 1430 1431 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1432 dir->i_ino, dentry, mode, 1433 MAJOR(rdev), MINOR(rdev)); 1434 1435 if (!new_valid_dev(rdev)) 1436 return -EINVAL; 1437 1438 name = __getname(); 1439 if (!name) 1440 return -ENOMEM; 1441 /* build extension */ 1442 if (S_ISBLK(mode)) 1443 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1444 else if (S_ISCHR(mode)) 1445 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1446 else if (S_ISFIFO(mode)) 1447 *name = 0; 1448 else if (S_ISSOCK(mode)) 1449 *name = 0; 1450 else { 1451 __putname(name); 1452 return -EINVAL; 1453 } 1454 1455 perm = unixmode2p9mode(v9ses, mode); 1456 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1457 __putname(name); 1458 1459 return retval; 1460 } 1461 1462 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1463 { 1464 int umode; 1465 dev_t rdev; 1466 loff_t i_size; 1467 struct p9_wstat *st; 1468 struct v9fs_session_info *v9ses; 1469 1470 v9ses = v9fs_inode2v9ses(inode); 1471 st = p9_client_stat(fid); 1472 if (IS_ERR(st)) 1473 return PTR_ERR(st); 1474 /* 1475 * Don't update inode if the file type is different 1476 */ 1477 umode = p9mode2unixmode(v9ses, st, &rdev); 1478 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1479 goto out; 1480 1481 spin_lock(&inode->i_lock); 1482 /* 1483 * We don't want to refresh inode->i_size, 1484 * because we may have cached data 1485 */ 1486 i_size = inode->i_size; 1487 v9fs_stat2inode(st, inode, inode->i_sb); 1488 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 1489 inode->i_size = i_size; 1490 spin_unlock(&inode->i_lock); 1491 out: 1492 p9stat_free(st); 1493 kfree(st); 1494 return 0; 1495 } 1496 1497 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1498 .create = v9fs_vfs_create, 1499 .lookup = v9fs_vfs_lookup, 1500 .atomic_open = v9fs_vfs_atomic_open, 1501 .symlink = v9fs_vfs_symlink, 1502 .link = v9fs_vfs_link, 1503 .unlink = v9fs_vfs_unlink, 1504 .mkdir = v9fs_vfs_mkdir, 1505 .rmdir = v9fs_vfs_rmdir, 1506 .mknod = v9fs_vfs_mknod, 1507 .rename = v9fs_vfs_rename, 1508 .getattr = v9fs_vfs_getattr, 1509 .setattr = v9fs_vfs_setattr, 1510 }; 1511 1512 static const struct inode_operations v9fs_dir_inode_operations = { 1513 .create = v9fs_vfs_create, 1514 .lookup = v9fs_vfs_lookup, 1515 .atomic_open = v9fs_vfs_atomic_open, 1516 .unlink = v9fs_vfs_unlink, 1517 .mkdir = v9fs_vfs_mkdir, 1518 .rmdir = v9fs_vfs_rmdir, 1519 .mknod = v9fs_vfs_mknod, 1520 .rename = v9fs_vfs_rename, 1521 .getattr = v9fs_vfs_getattr, 1522 .setattr = v9fs_vfs_setattr, 1523 }; 1524 1525 static const struct inode_operations v9fs_file_inode_operations = { 1526 .getattr = v9fs_vfs_getattr, 1527 .setattr = v9fs_vfs_setattr, 1528 }; 1529 1530 static const struct inode_operations v9fs_symlink_inode_operations = { 1531 .readlink = generic_readlink, 1532 .follow_link = v9fs_vfs_follow_link, 1533 .put_link = v9fs_vfs_put_link, 1534 .getattr = v9fs_vfs_getattr, 1535 .setattr = v9fs_vfs_setattr, 1536 }; 1537 1538