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 (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) 303 inode->i_fop = 304 &v9fs_cached_file_operations_dotl; 305 else 306 inode->i_fop = &v9fs_file_operations_dotl; 307 } else { 308 inode->i_op = &v9fs_file_inode_operations; 309 if (v9ses->cache) 310 inode->i_fop = &v9fs_cached_file_operations; 311 else 312 inode->i_fop = &v9fs_file_operations; 313 } 314 315 break; 316 case S_IFLNK: 317 if (!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)) { 318 p9_debug(P9_DEBUG_ERROR, 319 "extended modes used with legacy protocol\n"); 320 err = -EINVAL; 321 goto error; 322 } 323 324 if (v9fs_proto_dotl(v9ses)) 325 inode->i_op = &v9fs_symlink_inode_operations_dotl; 326 else 327 inode->i_op = &v9fs_symlink_inode_operations; 328 329 break; 330 case S_IFDIR: 331 inc_nlink(inode); 332 if (v9fs_proto_dotl(v9ses)) 333 inode->i_op = &v9fs_dir_inode_operations_dotl; 334 else if (v9fs_proto_dotu(v9ses)) 335 inode->i_op = &v9fs_dir_inode_operations_dotu; 336 else 337 inode->i_op = &v9fs_dir_inode_operations; 338 339 if (v9fs_proto_dotl(v9ses)) 340 inode->i_fop = &v9fs_dir_operations_dotl; 341 else 342 inode->i_fop = &v9fs_dir_operations; 343 344 break; 345 default: 346 p9_debug(P9_DEBUG_ERROR, "BAD mode 0x%hx S_IFMT 0x%x\n", 347 mode, mode & S_IFMT); 348 err = -EINVAL; 349 goto error; 350 } 351 error: 352 return err; 353 354 } 355 356 /** 357 * v9fs_get_inode - helper function to setup an inode 358 * @sb: superblock 359 * @mode: mode to setup inode with 360 * 361 */ 362 363 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev) 364 { 365 int err; 366 struct inode *inode; 367 struct v9fs_session_info *v9ses = sb->s_fs_info; 368 369 p9_debug(P9_DEBUG_VFS, "super block: %p mode: %ho\n", sb, mode); 370 371 inode = new_inode(sb); 372 if (!inode) { 373 pr_warn("%s (%d): Problem allocating inode\n", 374 __func__, task_pid_nr(current)); 375 return ERR_PTR(-ENOMEM); 376 } 377 err = v9fs_init_inode(v9ses, inode, mode, rdev); 378 if (err) { 379 iput(inode); 380 return ERR_PTR(err); 381 } 382 return inode; 383 } 384 385 /* 386 static struct v9fs_fid* 387 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 388 { 389 int err; 390 int nfid; 391 struct v9fs_fid *ret; 392 struct v9fs_fcall *fcall; 393 394 nfid = v9fs_get_idpool(&v9ses->fidpool); 395 if (nfid < 0) { 396 eprintk(KERN_WARNING, "no free fids available\n"); 397 return ERR_PTR(-ENOSPC); 398 } 399 400 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 401 &fcall); 402 403 if (err < 0) { 404 if (fcall && fcall->id == RWALK) 405 goto clunk_fid; 406 407 PRINT_FCALL_ERROR("walk error", fcall); 408 v9fs_put_idpool(nfid, &v9ses->fidpool); 409 goto error; 410 } 411 412 kfree(fcall); 413 fcall = NULL; 414 ret = v9fs_fid_create(v9ses, nfid); 415 if (!ret) { 416 err = -ENOMEM; 417 goto clunk_fid; 418 } 419 420 err = v9fs_fid_insert(ret, dentry); 421 if (err < 0) { 422 v9fs_fid_destroy(ret); 423 goto clunk_fid; 424 } 425 426 return ret; 427 428 clunk_fid: 429 v9fs_t_clunk(v9ses, nfid); 430 431 error: 432 kfree(fcall); 433 return ERR_PTR(err); 434 } 435 */ 436 437 438 /** 439 * v9fs_clear_inode - release an inode 440 * @inode: inode to release 441 * 442 */ 443 void v9fs_evict_inode(struct inode *inode) 444 { 445 struct v9fs_inode *v9inode = V9FS_I(inode); 446 447 truncate_inode_pages(inode->i_mapping, 0); 448 clear_inode(inode); 449 filemap_fdatawrite(inode->i_mapping); 450 451 #ifdef CONFIG_9P_FSCACHE 452 v9fs_cache_inode_put_cookie(inode); 453 #endif 454 /* clunk the fid stashed in writeback_fid */ 455 if (v9inode->writeback_fid) { 456 p9_client_clunk(v9inode->writeback_fid); 457 v9inode->writeback_fid = NULL; 458 } 459 } 460 461 static int v9fs_test_inode(struct inode *inode, void *data) 462 { 463 int umode; 464 dev_t rdev; 465 struct v9fs_inode *v9inode = V9FS_I(inode); 466 struct p9_wstat *st = (struct p9_wstat *)data; 467 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode); 468 469 umode = p9mode2unixmode(v9ses, st, &rdev); 470 /* don't match inode of different type */ 471 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 472 return 0; 473 474 /* compare qid details */ 475 if (memcmp(&v9inode->qid.version, 476 &st->qid.version, sizeof(v9inode->qid.version))) 477 return 0; 478 479 if (v9inode->qid.type != st->qid.type) 480 return 0; 481 return 1; 482 } 483 484 static int v9fs_test_new_inode(struct inode *inode, void *data) 485 { 486 return 0; 487 } 488 489 static int v9fs_set_inode(struct inode *inode, void *data) 490 { 491 struct v9fs_inode *v9inode = V9FS_I(inode); 492 struct p9_wstat *st = (struct p9_wstat *)data; 493 494 memcpy(&v9inode->qid, &st->qid, sizeof(st->qid)); 495 return 0; 496 } 497 498 static struct inode *v9fs_qid_iget(struct super_block *sb, 499 struct p9_qid *qid, 500 struct p9_wstat *st, 501 int new) 502 { 503 dev_t rdev; 504 int retval; 505 umode_t umode; 506 unsigned long i_ino; 507 struct inode *inode; 508 struct v9fs_session_info *v9ses = sb->s_fs_info; 509 int (*test)(struct inode *, void *); 510 511 if (new) 512 test = v9fs_test_new_inode; 513 else 514 test = v9fs_test_inode; 515 516 i_ino = v9fs_qid2ino(qid); 517 inode = iget5_locked(sb, i_ino, test, v9fs_set_inode, st); 518 if (!inode) 519 return ERR_PTR(-ENOMEM); 520 if (!(inode->i_state & I_NEW)) 521 return inode; 522 /* 523 * initialize the inode with the stat info 524 * FIXME!! we may need support for stale inodes 525 * later. 526 */ 527 inode->i_ino = i_ino; 528 umode = p9mode2unixmode(v9ses, st, &rdev); 529 retval = v9fs_init_inode(v9ses, inode, umode, rdev); 530 if (retval) 531 goto error; 532 533 v9fs_stat2inode(st, inode, sb); 534 #ifdef CONFIG_9P_FSCACHE 535 v9fs_cache_inode_get_cookie(inode); 536 #endif 537 unlock_new_inode(inode); 538 return inode; 539 error: 540 unlock_new_inode(inode); 541 iput(inode); 542 return ERR_PTR(retval); 543 544 } 545 546 struct inode * 547 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 548 struct super_block *sb, int new) 549 { 550 struct p9_wstat *st; 551 struct inode *inode = NULL; 552 553 st = p9_client_stat(fid); 554 if (IS_ERR(st)) 555 return ERR_CAST(st); 556 557 inode = v9fs_qid_iget(sb, &st->qid, st, new); 558 p9stat_free(st); 559 kfree(st); 560 return inode; 561 } 562 563 /** 564 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 565 * plan 9 AT flag. 566 * @flags: flags to convert 567 */ 568 static int v9fs_at_to_dotl_flags(int flags) 569 { 570 int rflags = 0; 571 if (flags & AT_REMOVEDIR) 572 rflags |= P9_DOTL_AT_REMOVEDIR; 573 return rflags; 574 } 575 576 /** 577 * v9fs_remove - helper function to remove files and directories 578 * @dir: directory inode that is being deleted 579 * @dentry: dentry that is being deleted 580 * @rmdir: removing a directory 581 * 582 */ 583 584 static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 585 { 586 struct inode *inode; 587 int retval = -EOPNOTSUPP; 588 struct p9_fid *v9fid, *dfid; 589 struct v9fs_session_info *v9ses; 590 591 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 592 dir, dentry, flags); 593 594 v9ses = v9fs_inode2v9ses(dir); 595 inode = dentry->d_inode; 596 dfid = v9fs_fid_lookup(dentry->d_parent); 597 if (IS_ERR(dfid)) { 598 retval = PTR_ERR(dfid); 599 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 600 return retval; 601 } 602 if (v9fs_proto_dotl(v9ses)) 603 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 604 v9fs_at_to_dotl_flags(flags)); 605 if (retval == -EOPNOTSUPP) { 606 /* Try the one based on path */ 607 v9fid = v9fs_fid_clone(dentry); 608 if (IS_ERR(v9fid)) 609 return PTR_ERR(v9fid); 610 retval = p9_client_remove(v9fid); 611 } 612 if (!retval) { 613 /* 614 * directories on unlink should have zero 615 * link count 616 */ 617 if (flags & AT_REMOVEDIR) { 618 clear_nlink(inode); 619 drop_nlink(dir); 620 } else 621 drop_nlink(inode); 622 623 v9fs_invalidate_inode_attr(inode); 624 v9fs_invalidate_inode_attr(dir); 625 } 626 return retval; 627 } 628 629 /** 630 * v9fs_create - Create a file 631 * @v9ses: session information 632 * @dir: directory that dentry is being created in 633 * @dentry: dentry that is being created 634 * @extension: 9p2000.u extension string to support devices, etc. 635 * @perm: create permissions 636 * @mode: open mode 637 * 638 */ 639 static struct p9_fid * 640 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 641 struct dentry *dentry, char *extension, u32 perm, u8 mode) 642 { 643 int err; 644 char *name; 645 struct p9_fid *dfid, *ofid, *fid; 646 struct inode *inode; 647 648 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 649 650 err = 0; 651 ofid = NULL; 652 fid = NULL; 653 name = (char *) dentry->d_name.name; 654 dfid = v9fs_fid_lookup(dentry->d_parent); 655 if (IS_ERR(dfid)) { 656 err = PTR_ERR(dfid); 657 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 658 return ERR_PTR(err); 659 } 660 661 /* clone a fid to use for creation */ 662 ofid = p9_client_walk(dfid, 0, NULL, 1); 663 if (IS_ERR(ofid)) { 664 err = PTR_ERR(ofid); 665 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 666 return ERR_PTR(err); 667 } 668 669 err = p9_client_fcreate(ofid, name, perm, mode, extension); 670 if (err < 0) { 671 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 672 goto error; 673 } 674 675 if (!(perm & P9_DMLINK)) { 676 /* now walk from the parent so we can get unopened fid */ 677 fid = p9_client_walk(dfid, 1, &name, 1); 678 if (IS_ERR(fid)) { 679 err = PTR_ERR(fid); 680 p9_debug(P9_DEBUG_VFS, 681 "p9_client_walk failed %d\n", err); 682 fid = NULL; 683 goto error; 684 } 685 /* 686 * instantiate inode and assign the unopened fid to the dentry 687 */ 688 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 689 if (IS_ERR(inode)) { 690 err = PTR_ERR(inode); 691 p9_debug(P9_DEBUG_VFS, 692 "inode creation failed %d\n", err); 693 goto error; 694 } 695 v9fs_fid_add(dentry, fid); 696 d_instantiate(dentry, inode); 697 } 698 return ofid; 699 error: 700 if (ofid) 701 p9_client_clunk(ofid); 702 703 if (fid) 704 p9_client_clunk(fid); 705 706 return ERR_PTR(err); 707 } 708 709 /** 710 * v9fs_vfs_create - VFS hook to create a regular file 711 * 712 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 713 * for mknod(2). 714 * 715 * @dir: directory inode that is being created 716 * @dentry: dentry that is being deleted 717 * @mode: create permissions 718 * 719 */ 720 721 static int 722 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 723 bool excl) 724 { 725 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 726 u32 perm = unixmode2p9mode(v9ses, mode); 727 struct p9_fid *fid; 728 729 /* P9_OEXCL? */ 730 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 731 if (IS_ERR(fid)) 732 return PTR_ERR(fid); 733 734 v9fs_invalidate_inode_attr(dir); 735 p9_client_clunk(fid); 736 737 return 0; 738 } 739 740 /** 741 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 742 * @dir: inode that is being unlinked 743 * @dentry: dentry that is being unlinked 744 * @mode: mode for new directory 745 * 746 */ 747 748 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 749 { 750 int err; 751 u32 perm; 752 struct p9_fid *fid; 753 struct v9fs_session_info *v9ses; 754 755 p9_debug(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 756 err = 0; 757 v9ses = v9fs_inode2v9ses(dir); 758 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 759 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 760 if (IS_ERR(fid)) { 761 err = PTR_ERR(fid); 762 fid = NULL; 763 } else { 764 inc_nlink(dir); 765 v9fs_invalidate_inode_attr(dir); 766 } 767 768 if (fid) 769 p9_client_clunk(fid); 770 771 return err; 772 } 773 774 /** 775 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 776 * @dir: inode that is being walked from 777 * @dentry: dentry that is being walked to? 778 * @nameidata: path data 779 * 780 */ 781 782 struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 783 unsigned int flags) 784 { 785 struct dentry *res; 786 struct super_block *sb; 787 struct v9fs_session_info *v9ses; 788 struct p9_fid *dfid, *fid; 789 struct inode *inode; 790 char *name; 791 792 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p flags: %x\n", 793 dir, dentry->d_name.name, dentry, flags); 794 795 if (dentry->d_name.len > NAME_MAX) 796 return ERR_PTR(-ENAMETOOLONG); 797 798 sb = dir->i_sb; 799 v9ses = v9fs_inode2v9ses(dir); 800 /* We can walk d_parent because we hold the dir->i_mutex */ 801 dfid = v9fs_fid_lookup(dentry->d_parent); 802 if (IS_ERR(dfid)) 803 return ERR_CAST(dfid); 804 805 name = (char *) dentry->d_name.name; 806 fid = p9_client_walk(dfid, 1, &name, 1); 807 if (IS_ERR(fid)) { 808 if (fid == ERR_PTR(-ENOENT)) { 809 d_add(dentry, NULL); 810 return NULL; 811 } 812 return ERR_CAST(fid); 813 } 814 /* 815 * Make sure we don't use a wrong inode due to parallel 816 * unlink. For cached mode create calls request for new 817 * inode. But with cache disabled, lookup should do this. 818 */ 819 if (v9ses->cache) 820 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb); 821 else 822 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 823 if (IS_ERR(inode)) { 824 p9_client_clunk(fid); 825 return ERR_CAST(inode); 826 } 827 /* 828 * If we had a rename on the server and a parallel lookup 829 * for the new name, then make sure we instantiate with 830 * the new name. ie look up for a/b, while on server somebody 831 * moved b under k and client parallely did a lookup for 832 * k/b. 833 */ 834 res = d_materialise_unique(dentry, inode); 835 if (!res) 836 v9fs_fid_add(dentry, fid); 837 else if (!IS_ERR(res)) 838 v9fs_fid_add(res, fid); 839 else 840 p9_client_clunk(fid); 841 return res; 842 } 843 844 static int 845 v9fs_vfs_atomic_open(struct inode *dir, struct dentry *dentry, 846 struct file *file, unsigned flags, umode_t mode, 847 int *opened) 848 { 849 int err; 850 u32 perm; 851 struct v9fs_inode *v9inode; 852 struct v9fs_session_info *v9ses; 853 struct p9_fid *fid, *inode_fid; 854 struct dentry *res = NULL; 855 856 if (d_unhashed(dentry)) { 857 res = v9fs_vfs_lookup(dir, dentry, 0); 858 if (IS_ERR(res)) 859 return PTR_ERR(res); 860 861 if (res) 862 dentry = res; 863 } 864 865 /* Only creates */ 866 if (!(flags & O_CREAT) || dentry->d_inode) 867 return finish_no_open(file, res); 868 869 err = 0; 870 fid = NULL; 871 v9ses = v9fs_inode2v9ses(dir); 872 perm = unixmode2p9mode(v9ses, mode); 873 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 874 v9fs_uflags2omode(flags, 875 v9fs_proto_dotu(v9ses))); 876 if (IS_ERR(fid)) { 877 err = PTR_ERR(fid); 878 fid = NULL; 879 goto error; 880 } 881 882 v9fs_invalidate_inode_attr(dir); 883 v9inode = V9FS_I(dentry->d_inode); 884 mutex_lock(&v9inode->v_mutex); 885 if (v9ses->cache && !v9inode->writeback_fid && 886 ((flags & O_ACCMODE) != O_RDONLY)) { 887 /* 888 * clone a fid and add it to writeback_fid 889 * we do it during open time instead of 890 * page dirty time via write_begin/page_mkwrite 891 * because we want write after unlink usecase 892 * to work. 893 */ 894 inode_fid = v9fs_writeback_fid(dentry); 895 if (IS_ERR(inode_fid)) { 896 err = PTR_ERR(inode_fid); 897 mutex_unlock(&v9inode->v_mutex); 898 goto error; 899 } 900 v9inode->writeback_fid = (void *) inode_fid; 901 } 902 mutex_unlock(&v9inode->v_mutex); 903 err = finish_open(file, dentry, generic_file_open, opened); 904 if (err) 905 goto error; 906 907 file->private_data = fid; 908 #ifdef CONFIG_9P_FSCACHE 909 if (v9ses->cache) 910 v9fs_cache_inode_set_cookie(dentry->d_inode, file); 911 #endif 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 = old_dentry->d_inode; 973 new_inode = new_dentry->d_inode; 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 int err; 1058 struct v9fs_session_info *v9ses; 1059 struct p9_fid *fid; 1060 struct p9_wstat *st; 1061 1062 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1063 err = -EPERM; 1064 v9ses = v9fs_dentry2v9ses(dentry); 1065 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1066 generic_fillattr(dentry->d_inode, stat); 1067 return 0; 1068 } 1069 fid = v9fs_fid_lookup(dentry); 1070 if (IS_ERR(fid)) 1071 return PTR_ERR(fid); 1072 1073 st = p9_client_stat(fid); 1074 if (IS_ERR(st)) 1075 return PTR_ERR(st); 1076 1077 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 1078 generic_fillattr(dentry->d_inode, stat); 1079 1080 p9stat_free(st); 1081 kfree(st); 1082 return 0; 1083 } 1084 1085 /** 1086 * v9fs_vfs_setattr - set file metadata 1087 * @dentry: file whose metadata to set 1088 * @iattr: metadata assignment structure 1089 * 1090 */ 1091 1092 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1093 { 1094 int retval; 1095 struct v9fs_session_info *v9ses; 1096 struct p9_fid *fid; 1097 struct p9_wstat wstat; 1098 1099 p9_debug(P9_DEBUG_VFS, "\n"); 1100 retval = inode_change_ok(dentry->d_inode, iattr); 1101 if (retval) 1102 return retval; 1103 1104 retval = -EPERM; 1105 v9ses = v9fs_dentry2v9ses(dentry); 1106 fid = v9fs_fid_lookup(dentry); 1107 if(IS_ERR(fid)) 1108 return PTR_ERR(fid); 1109 1110 v9fs_blank_wstat(&wstat); 1111 if (iattr->ia_valid & ATTR_MODE) 1112 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1113 1114 if (iattr->ia_valid & ATTR_MTIME) 1115 wstat.mtime = iattr->ia_mtime.tv_sec; 1116 1117 if (iattr->ia_valid & ATTR_ATIME) 1118 wstat.atime = iattr->ia_atime.tv_sec; 1119 1120 if (iattr->ia_valid & ATTR_SIZE) 1121 wstat.length = iattr->ia_size; 1122 1123 if (v9fs_proto_dotu(v9ses)) { 1124 if (iattr->ia_valid & ATTR_UID) 1125 wstat.n_uid = iattr->ia_uid; 1126 1127 if (iattr->ia_valid & ATTR_GID) 1128 wstat.n_gid = iattr->ia_gid; 1129 } 1130 1131 /* Write all dirty data */ 1132 if (S_ISREG(dentry->d_inode->i_mode)) 1133 filemap_write_and_wait(dentry->d_inode->i_mapping); 1134 1135 retval = p9_client_wstat(fid, &wstat); 1136 if (retval < 0) 1137 return retval; 1138 1139 if ((iattr->ia_valid & ATTR_SIZE) && 1140 iattr->ia_size != i_size_read(dentry->d_inode)) 1141 truncate_setsize(dentry->d_inode, iattr->ia_size); 1142 1143 v9fs_invalidate_inode_attr(dentry->d_inode); 1144 1145 setattr_copy(dentry->d_inode, iattr); 1146 mark_inode_dirty(dentry->d_inode); 1147 return 0; 1148 } 1149 1150 /** 1151 * v9fs_stat2inode - populate an inode structure with mistat info 1152 * @stat: Plan 9 metadata (mistat) structure 1153 * @inode: inode to populate 1154 * @sb: superblock of filesystem 1155 * 1156 */ 1157 1158 void 1159 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1160 struct super_block *sb) 1161 { 1162 umode_t mode; 1163 char ext[32]; 1164 char tag_name[14]; 1165 unsigned int i_nlink; 1166 struct v9fs_session_info *v9ses = sb->s_fs_info; 1167 struct v9fs_inode *v9inode = V9FS_I(inode); 1168 1169 set_nlink(inode, 1); 1170 1171 inode->i_atime.tv_sec = stat->atime; 1172 inode->i_mtime.tv_sec = stat->mtime; 1173 inode->i_ctime.tv_sec = stat->mtime; 1174 1175 inode->i_uid = v9ses->dfltuid; 1176 inode->i_gid = v9ses->dfltgid; 1177 1178 if (v9fs_proto_dotu(v9ses)) { 1179 inode->i_uid = stat->n_uid; 1180 inode->i_gid = stat->n_gid; 1181 } 1182 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1183 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1184 /* 1185 * Hadlink support got added later to 1186 * to the .u extension. So there can be 1187 * server out there that doesn't support 1188 * this even with .u extension. So check 1189 * for non NULL stat->extension 1190 */ 1191 strncpy(ext, stat->extension, sizeof(ext)); 1192 /* HARDLINKCOUNT %u */ 1193 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1194 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1195 set_nlink(inode, i_nlink); 1196 } 1197 } 1198 mode = p9mode2perm(v9ses, stat); 1199 mode |= inode->i_mode & ~S_IALLUGO; 1200 inode->i_mode = mode; 1201 i_size_write(inode, stat->length); 1202 1203 /* not real number of blocks, but 512 byte ones ... */ 1204 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1205 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1206 } 1207 1208 /** 1209 * v9fs_qid2ino - convert qid into inode number 1210 * @qid: qid to hash 1211 * 1212 * BUG: potential for inode number collisions? 1213 */ 1214 1215 ino_t v9fs_qid2ino(struct p9_qid *qid) 1216 { 1217 u64 path = qid->path + 2; 1218 ino_t i = 0; 1219 1220 if (sizeof(ino_t) == sizeof(path)) 1221 memcpy(&i, &path, sizeof(ino_t)); 1222 else 1223 i = (ino_t) (path ^ (path >> 32)); 1224 1225 return i; 1226 } 1227 1228 /** 1229 * v9fs_readlink - read a symlink's location (internal version) 1230 * @dentry: dentry for symlink 1231 * @buffer: buffer to load symlink location into 1232 * @buflen: length of buffer 1233 * 1234 */ 1235 1236 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1237 { 1238 int retval; 1239 1240 struct v9fs_session_info *v9ses; 1241 struct p9_fid *fid; 1242 struct p9_wstat *st; 1243 1244 p9_debug(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 1245 retval = -EPERM; 1246 v9ses = v9fs_dentry2v9ses(dentry); 1247 fid = v9fs_fid_lookup(dentry); 1248 if (IS_ERR(fid)) 1249 return PTR_ERR(fid); 1250 1251 if (!v9fs_proto_dotu(v9ses)) 1252 return -EBADF; 1253 1254 st = p9_client_stat(fid); 1255 if (IS_ERR(st)) 1256 return PTR_ERR(st); 1257 1258 if (!(st->mode & P9_DMSYMLINK)) { 1259 retval = -EINVAL; 1260 goto done; 1261 } 1262 1263 /* copy extension buffer into buffer */ 1264 retval = min(strlen(st->extension)+1, (size_t)buflen); 1265 memcpy(buffer, st->extension, retval); 1266 1267 p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n", 1268 dentry->d_name.name, st->extension, buflen, buffer); 1269 1270 done: 1271 p9stat_free(st); 1272 kfree(st); 1273 return retval; 1274 } 1275 1276 /** 1277 * v9fs_vfs_follow_link - follow a symlink path 1278 * @dentry: dentry for symlink 1279 * @nd: nameidata 1280 * 1281 */ 1282 1283 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1284 { 1285 int len = 0; 1286 char *link = __getname(); 1287 1288 p9_debug(P9_DEBUG_VFS, "%s\n", dentry->d_name.name); 1289 1290 if (!link) 1291 link = ERR_PTR(-ENOMEM); 1292 else { 1293 len = v9fs_readlink(dentry, link, PATH_MAX); 1294 1295 if (len < 0) { 1296 __putname(link); 1297 link = ERR_PTR(len); 1298 } else 1299 link[min(len, PATH_MAX-1)] = 0; 1300 } 1301 nd_set_link(nd, link); 1302 1303 return NULL; 1304 } 1305 1306 /** 1307 * v9fs_vfs_put_link - release a symlink path 1308 * @dentry: dentry for symlink 1309 * @nd: nameidata 1310 * @p: unused 1311 * 1312 */ 1313 1314 void 1315 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1316 { 1317 char *s = nd_get_link(nd); 1318 1319 p9_debug(P9_DEBUG_VFS, " %s %s\n", 1320 dentry->d_name.name, IS_ERR(s) ? "<error>" : s); 1321 if (!IS_ERR(s)) 1322 __putname(s); 1323 } 1324 1325 /** 1326 * v9fs_vfs_mkspecial - create a special file 1327 * @dir: inode to create special file in 1328 * @dentry: dentry to create 1329 * @mode: mode to create special file 1330 * @extension: 9p2000.u format extension string representing special file 1331 * 1332 */ 1333 1334 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1335 u32 perm, const char *extension) 1336 { 1337 struct p9_fid *fid; 1338 struct v9fs_session_info *v9ses; 1339 1340 v9ses = v9fs_inode2v9ses(dir); 1341 if (!v9fs_proto_dotu(v9ses)) { 1342 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1343 return -EPERM; 1344 } 1345 1346 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1347 P9_OREAD); 1348 if (IS_ERR(fid)) 1349 return PTR_ERR(fid); 1350 1351 v9fs_invalidate_inode_attr(dir); 1352 p9_client_clunk(fid); 1353 return 0; 1354 } 1355 1356 /** 1357 * v9fs_vfs_symlink - helper function to create symlinks 1358 * @dir: directory inode containing symlink 1359 * @dentry: dentry for symlink 1360 * @symname: symlink data 1361 * 1362 * See Also: 9P2000.u RFC for more information 1363 * 1364 */ 1365 1366 static int 1367 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1368 { 1369 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 1370 dir->i_ino, dentry->d_name.name, symname); 1371 1372 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1373 } 1374 1375 /** 1376 * v9fs_vfs_link - create a hardlink 1377 * @old_dentry: dentry for file to link to 1378 * @dir: inode destination for new link 1379 * @dentry: dentry for link 1380 * 1381 */ 1382 1383 static int 1384 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1385 struct dentry *dentry) 1386 { 1387 int retval; 1388 char *name; 1389 struct p9_fid *oldfid; 1390 1391 p9_debug(P9_DEBUG_VFS, " %lu,%s,%s\n", 1392 dir->i_ino, dentry->d_name.name, old_dentry->d_name.name); 1393 1394 oldfid = v9fs_fid_clone(old_dentry); 1395 if (IS_ERR(oldfid)) 1396 return PTR_ERR(oldfid); 1397 1398 name = __getname(); 1399 if (unlikely(!name)) { 1400 retval = -ENOMEM; 1401 goto clunk_fid; 1402 } 1403 1404 sprintf(name, "%d\n", oldfid->fid); 1405 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1406 __putname(name); 1407 if (!retval) { 1408 v9fs_refresh_inode(oldfid, old_dentry->d_inode); 1409 v9fs_invalidate_inode_attr(dir); 1410 } 1411 clunk_fid: 1412 p9_client_clunk(oldfid); 1413 return retval; 1414 } 1415 1416 /** 1417 * v9fs_vfs_mknod - create a special file 1418 * @dir: inode destination for new link 1419 * @dentry: dentry for file 1420 * @mode: mode for creation 1421 * @rdev: device associated with special file 1422 * 1423 */ 1424 1425 static int 1426 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1427 { 1428 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1429 int retval; 1430 char *name; 1431 u32 perm; 1432 1433 p9_debug(P9_DEBUG_VFS, " %lu,%s mode: %hx MAJOR: %u MINOR: %u\n", 1434 dir->i_ino, dentry->d_name.name, mode, 1435 MAJOR(rdev), MINOR(rdev)); 1436 1437 if (!new_valid_dev(rdev)) 1438 return -EINVAL; 1439 1440 name = __getname(); 1441 if (!name) 1442 return -ENOMEM; 1443 /* build extension */ 1444 if (S_ISBLK(mode)) 1445 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1446 else if (S_ISCHR(mode)) 1447 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1448 else if (S_ISFIFO(mode)) 1449 *name = 0; 1450 else if (S_ISSOCK(mode)) 1451 *name = 0; 1452 else { 1453 __putname(name); 1454 return -EINVAL; 1455 } 1456 1457 perm = unixmode2p9mode(v9ses, mode); 1458 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1459 __putname(name); 1460 1461 return retval; 1462 } 1463 1464 int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1465 { 1466 int umode; 1467 dev_t rdev; 1468 loff_t i_size; 1469 struct p9_wstat *st; 1470 struct v9fs_session_info *v9ses; 1471 1472 v9ses = v9fs_inode2v9ses(inode); 1473 st = p9_client_stat(fid); 1474 if (IS_ERR(st)) 1475 return PTR_ERR(st); 1476 /* 1477 * Don't update inode if the file type is different 1478 */ 1479 umode = p9mode2unixmode(v9ses, st, &rdev); 1480 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1481 goto out; 1482 1483 spin_lock(&inode->i_lock); 1484 /* 1485 * We don't want to refresh inode->i_size, 1486 * because we may have cached data 1487 */ 1488 i_size = inode->i_size; 1489 v9fs_stat2inode(st, inode, inode->i_sb); 1490 if (v9ses->cache) 1491 inode->i_size = i_size; 1492 spin_unlock(&inode->i_lock); 1493 out: 1494 p9stat_free(st); 1495 kfree(st); 1496 return 0; 1497 } 1498 1499 static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1500 .create = v9fs_vfs_create, 1501 .lookup = v9fs_vfs_lookup, 1502 .atomic_open = v9fs_vfs_atomic_open, 1503 .symlink = v9fs_vfs_symlink, 1504 .link = v9fs_vfs_link, 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_dir_inode_operations = { 1515 .create = v9fs_vfs_create, 1516 .lookup = v9fs_vfs_lookup, 1517 .atomic_open = v9fs_vfs_atomic_open, 1518 .unlink = v9fs_vfs_unlink, 1519 .mkdir = v9fs_vfs_mkdir, 1520 .rmdir = v9fs_vfs_rmdir, 1521 .mknod = v9fs_vfs_mknod, 1522 .rename = v9fs_vfs_rename, 1523 .getattr = v9fs_vfs_getattr, 1524 .setattr = v9fs_vfs_setattr, 1525 }; 1526 1527 static const struct inode_operations v9fs_file_inode_operations = { 1528 .getattr = v9fs_vfs_getattr, 1529 .setattr = v9fs_vfs_setattr, 1530 }; 1531 1532 static const struct inode_operations v9fs_symlink_inode_operations = { 1533 .readlink = generic_readlink, 1534 .follow_link = v9fs_vfs_follow_link, 1535 .put_link = v9fs_vfs_put_link, 1536 .getattr = v9fs_vfs_getattr, 1537 .setattr = v9fs_vfs_setattr, 1538 }; 1539 1540