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 52static const struct inode_operations v9fs_dir_inode_operations; 53static const struct inode_operations v9fs_dir_inode_operations_dotu; 54static const struct inode_operations v9fs_file_inode_operations; 55static 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 64static 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 */ 98static 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 */ 125static 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 175int 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 212void 213v9fs_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 */ 238struct 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 260static 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 266void v9fs_destroy_inode(struct inode *inode) 267{ 268 call_rcu(&inode->i_rcu, v9fs_i_callback); 269} 270 271int 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 } 358error: 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 370struct 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/* 393static struct v9fs_fid* 394v9fs_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 435clunk_fid: 436 v9fs_t_clunk(v9ses, nfid); 437 438error: 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 */ 450void 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 466static 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 489static int v9fs_test_new_inode(struct inode *inode, void *data) 490{ 491 return 0; 492} 493 494static 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 503static 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; 542error: 543 iget_failed(inode); 544 return ERR_PTR(retval); 545 546} 547 548struct inode * 549v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 550 struct super_block *sb, int new) 551{ 552 struct p9_wstat *st; 553 struct inode *inode = NULL; 554 555 st = p9_client_stat(fid); 556 if (IS_ERR(st)) 557 return ERR_CAST(st); 558 559 inode = v9fs_qid_iget(sb, &st->qid, st, new); 560 p9stat_free(st); 561 kfree(st); 562 return inode; 563} 564 565/** 566 * v9fs_at_to_dotl_flags- convert Linux specific AT flags to 567 * plan 9 AT flag. 568 * @flags: flags to convert 569 */ 570static int v9fs_at_to_dotl_flags(int flags) 571{ 572 int rflags = 0; 573 if (flags & AT_REMOVEDIR) 574 rflags |= P9_DOTL_AT_REMOVEDIR; 575 return rflags; 576} 577 578/** 579 * v9fs_remove - helper function to remove files and directories 580 * @dir: directory inode that is being deleted 581 * @dentry: dentry that is being deleted 582 * @flags: removing a directory 583 * 584 */ 585 586static int v9fs_remove(struct inode *dir, struct dentry *dentry, int flags) 587{ 588 struct inode *inode; 589 int retval = -EOPNOTSUPP; 590 struct p9_fid *v9fid, *dfid; 591 struct v9fs_session_info *v9ses; 592 593 p9_debug(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %x\n", 594 dir, dentry, flags); 595 596 v9ses = v9fs_inode2v9ses(dir); 597 inode = d_inode(dentry); 598 dfid = v9fs_fid_lookup(dentry->d_parent); 599 if (IS_ERR(dfid)) { 600 retval = PTR_ERR(dfid); 601 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", retval); 602 return retval; 603 } 604 if (v9fs_proto_dotl(v9ses)) 605 retval = p9_client_unlinkat(dfid, dentry->d_name.name, 606 v9fs_at_to_dotl_flags(flags)); 607 if (retval == -EOPNOTSUPP) { 608 /* Try the one based on path */ 609 v9fid = v9fs_fid_clone(dentry); 610 if (IS_ERR(v9fid)) 611 return PTR_ERR(v9fid); 612 retval = p9_client_remove(v9fid); 613 } 614 if (!retval) { 615 /* 616 * directories on unlink should have zero 617 * link count 618 */ 619 if (flags & AT_REMOVEDIR) { 620 clear_nlink(inode); 621 drop_nlink(dir); 622 } else 623 drop_nlink(inode); 624 625 v9fs_invalidate_inode_attr(inode); 626 v9fs_invalidate_inode_attr(dir); 627 } 628 return retval; 629} 630 631/** 632 * v9fs_create - Create a file 633 * @v9ses: session information 634 * @dir: directory that dentry is being created in 635 * @dentry: dentry that is being created 636 * @extension: 9p2000.u extension string to support devices, etc. 637 * @perm: create permissions 638 * @mode: open mode 639 * 640 */ 641static struct p9_fid * 642v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 643 struct dentry *dentry, char *extension, u32 perm, u8 mode) 644{ 645 int err; 646 char *name; 647 struct p9_fid *dfid, *ofid, *fid; 648 struct inode *inode; 649 650 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 651 652 err = 0; 653 ofid = NULL; 654 fid = NULL; 655 name = (char *) dentry->d_name.name; 656 dfid = v9fs_fid_lookup(dentry->d_parent); 657 if (IS_ERR(dfid)) { 658 err = PTR_ERR(dfid); 659 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err); 660 return ERR_PTR(err); 661 } 662 663 /* clone a fid to use for creation */ 664 ofid = p9_client_walk(dfid, 0, NULL, 1); 665 if (IS_ERR(ofid)) { 666 err = PTR_ERR(ofid); 667 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 668 return ERR_PTR(err); 669 } 670 671 err = p9_client_fcreate(ofid, name, perm, mode, extension); 672 if (err < 0) { 673 p9_debug(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 674 goto error; 675 } 676 677 if (!(perm & P9_DMLINK)) { 678 /* now walk from the parent so we can get unopened fid */ 679 fid = p9_client_walk(dfid, 1, &name, 1); 680 if (IS_ERR(fid)) { 681 err = PTR_ERR(fid); 682 p9_debug(P9_DEBUG_VFS, 683 "p9_client_walk failed %d\n", err); 684 fid = NULL; 685 goto error; 686 } 687 /* 688 * instantiate inode and assign the unopened fid to the dentry 689 */ 690 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb); 691 if (IS_ERR(inode)) { 692 err = PTR_ERR(inode); 693 p9_debug(P9_DEBUG_VFS, 694 "inode creation failed %d\n", err); 695 goto error; 696 } 697 v9fs_fid_add(dentry, fid); 698 d_instantiate(dentry, inode); 699 } 700 return ofid; 701error: 702 if (ofid) 703 p9_client_clunk(ofid); 704 705 if (fid) 706 p9_client_clunk(fid); 707 708 return ERR_PTR(err); 709} 710 711/** 712 * v9fs_vfs_create - VFS hook to create a regular file 713 * 714 * open(.., O_CREAT) is handled in v9fs_vfs_atomic_open(). This is only called 715 * for mknod(2). 716 * 717 * @dir: directory inode that is being created 718 * @dentry: dentry that is being deleted 719 * @mode: create permissions 720 * 721 */ 722 723static int 724v9fs_vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode, 725 bool excl) 726{ 727 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 728 u32 perm = unixmode2p9mode(v9ses, mode); 729 struct p9_fid *fid; 730 731 /* P9_OEXCL? */ 732 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_ORDWR); 733 if (IS_ERR(fid)) 734 return PTR_ERR(fid); 735 736 v9fs_invalidate_inode_attr(dir); 737 p9_client_clunk(fid); 738 739 return 0; 740} 741 742/** 743 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 744 * @dir: inode that is being unlinked 745 * @dentry: dentry that is being unlinked 746 * @mode: mode for new directory 747 * 748 */ 749 750static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 751{ 752 int err; 753 u32 perm; 754 struct p9_fid *fid; 755 struct v9fs_session_info *v9ses; 756 757 p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry); 758 err = 0; 759 v9ses = v9fs_inode2v9ses(dir); 760 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 761 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 762 if (IS_ERR(fid)) { 763 err = PTR_ERR(fid); 764 fid = NULL; 765 } else { 766 inc_nlink(dir); 767 v9fs_invalidate_inode_attr(dir); 768 } 769 770 if (fid) 771 p9_client_clunk(fid); 772 773 return err; 774} 775 776/** 777 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 778 * @dir: inode that is being walked from 779 * @dentry: dentry that is being walked to? 780 * @flags: lookup flags (unused) 781 * 782 */ 783 784struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 785 unsigned int flags) 786{ 787 struct dentry *res; 788 struct v9fs_session_info *v9ses; 789 struct p9_fid *dfid, *fid; 790 struct inode *inode; 791 char *name; 792 793 p9_debug(P9_DEBUG_VFS, "dir: %p dentry: (%pd) %p flags: %x\n", 794 dir, dentry, dentry, flags); 795 796 if (dentry->d_name.len > NAME_MAX) 797 return ERR_PTR(-ENAMETOOLONG); 798 799 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 == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 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_splice_alias(inode, dentry); 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 844static int 845v9fs_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) || d_really_is_positive(dentry)) 867 return finish_no_open(file, res); 868 869 err = 0; 870 871 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(d_inode(dentry)); 884 mutex_lock(&v9inode->v_mutex); 885 if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) && 886 !v9inode->writeback_fid && 887 ((flags & O_ACCMODE) != O_RDONLY)) { 888 /* 889 * clone a fid and add it to writeback_fid 890 * we do it during open time instead of 891 * page dirty time via write_begin/page_mkwrite 892 * because we want write after unlink usecase 893 * to work. 894 */ 895 inode_fid = v9fs_writeback_fid(dentry); 896 if (IS_ERR(inode_fid)) { 897 err = PTR_ERR(inode_fid); 898 mutex_unlock(&v9inode->v_mutex); 899 goto error; 900 } 901 v9inode->writeback_fid = (void *) inode_fid; 902 } 903 mutex_unlock(&v9inode->v_mutex); 904 err = finish_open(file, dentry, generic_file_open, opened); 905 if (err) 906 goto error; 907 908 file->private_data = fid; 909 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 910 v9fs_cache_inode_set_cookie(d_inode(dentry), file); 911 912 *opened |= FILE_CREATED; 913out: 914 dput(res); 915 return err; 916 917error: 918 if (fid) 919 p9_client_clunk(fid); 920 goto out; 921} 922 923/** 924 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 925 * @i: inode that is being unlinked 926 * @d: dentry that is being unlinked 927 * 928 */ 929 930int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 931{ 932 return v9fs_remove(i, d, 0); 933} 934 935/** 936 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 937 * @i: inode that is being unlinked 938 * @d: dentry that is being unlinked 939 * 940 */ 941 942int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 943{ 944 return v9fs_remove(i, d, AT_REMOVEDIR); 945} 946 947/** 948 * v9fs_vfs_rename - VFS hook to rename an inode 949 * @old_dir: old dir inode 950 * @old_dentry: old dentry 951 * @new_dir: new dir inode 952 * @new_dentry: new dentry 953 * 954 */ 955 956int 957v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 958 struct inode *new_dir, struct dentry *new_dentry) 959{ 960 int retval; 961 struct inode *old_inode; 962 struct inode *new_inode; 963 struct v9fs_session_info *v9ses; 964 struct p9_fid *oldfid; 965 struct p9_fid *olddirfid; 966 struct p9_fid *newdirfid; 967 struct p9_wstat wstat; 968 969 p9_debug(P9_DEBUG_VFS, "\n"); 970 retval = 0; 971 old_inode = d_inode(old_dentry); 972 new_inode = d_inode(new_dentry); 973 v9ses = v9fs_inode2v9ses(old_inode); 974 oldfid = v9fs_fid_lookup(old_dentry); 975 if (IS_ERR(oldfid)) 976 return PTR_ERR(oldfid); 977 978 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 979 if (IS_ERR(olddirfid)) { 980 retval = PTR_ERR(olddirfid); 981 goto done; 982 } 983 984 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 985 if (IS_ERR(newdirfid)) { 986 retval = PTR_ERR(newdirfid); 987 goto clunk_olddir; 988 } 989 990 down_write(&v9ses->rename_sem); 991 if (v9fs_proto_dotl(v9ses)) { 992 retval = p9_client_renameat(olddirfid, old_dentry->d_name.name, 993 newdirfid, new_dentry->d_name.name); 994 if (retval == -EOPNOTSUPP) 995 retval = p9_client_rename(oldfid, newdirfid, 996 new_dentry->d_name.name); 997 if (retval != -EOPNOTSUPP) 998 goto clunk_newdir; 999 } 1000 if (old_dentry->d_parent != new_dentry->d_parent) { 1001 /* 1002 * 9P .u can only handle file rename in the same directory 1003 */ 1004 1005 p9_debug(P9_DEBUG_ERROR, "old dir and new dir are different\n"); 1006 retval = -EXDEV; 1007 goto clunk_newdir; 1008 } 1009 v9fs_blank_wstat(&wstat); 1010 wstat.muid = v9ses->uname; 1011 wstat.name = (char *) new_dentry->d_name.name; 1012 retval = p9_client_wstat(oldfid, &wstat); 1013 1014clunk_newdir: 1015 if (!retval) { 1016 if (new_inode) { 1017 if (S_ISDIR(new_inode->i_mode)) 1018 clear_nlink(new_inode); 1019 else 1020 drop_nlink(new_inode); 1021 } 1022 if (S_ISDIR(old_inode->i_mode)) { 1023 if (!new_inode) 1024 inc_nlink(new_dir); 1025 drop_nlink(old_dir); 1026 } 1027 v9fs_invalidate_inode_attr(old_inode); 1028 v9fs_invalidate_inode_attr(old_dir); 1029 v9fs_invalidate_inode_attr(new_dir); 1030 1031 /* successful rename */ 1032 d_move(old_dentry, new_dentry); 1033 } 1034 up_write(&v9ses->rename_sem); 1035 p9_client_clunk(newdirfid); 1036 1037clunk_olddir: 1038 p9_client_clunk(olddirfid); 1039 1040done: 1041 return retval; 1042} 1043 1044/** 1045 * v9fs_vfs_getattr - retrieve file metadata 1046 * @mnt: mount information 1047 * @dentry: file to get attributes on 1048 * @stat: metadata structure to populate 1049 * 1050 */ 1051 1052static int 1053v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 1054 struct kstat *stat) 1055{ 1056 struct v9fs_session_info *v9ses; 1057 struct p9_fid *fid; 1058 struct p9_wstat *st; 1059 1060 p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry); 1061 v9ses = v9fs_dentry2v9ses(dentry); 1062 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) { 1063 generic_fillattr(d_inode(dentry), stat); 1064 return 0; 1065 } 1066 fid = v9fs_fid_lookup(dentry); 1067 if (IS_ERR(fid)) 1068 return PTR_ERR(fid); 1069 1070 st = p9_client_stat(fid); 1071 if (IS_ERR(st)) 1072 return PTR_ERR(st); 1073 1074 v9fs_stat2inode(st, d_inode(dentry), d_inode(dentry)->i_sb); 1075 generic_fillattr(d_inode(dentry), stat); 1076 1077 p9stat_free(st); 1078 kfree(st); 1079 return 0; 1080} 1081 1082/** 1083 * v9fs_vfs_setattr - set file metadata 1084 * @dentry: file whose metadata to set 1085 * @iattr: metadata assignment structure 1086 * 1087 */ 1088 1089static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 1090{ 1091 int retval; 1092 struct v9fs_session_info *v9ses; 1093 struct p9_fid *fid; 1094 struct p9_wstat wstat; 1095 1096 p9_debug(P9_DEBUG_VFS, "\n"); 1097 retval = inode_change_ok(d_inode(dentry), iattr); 1098 if (retval) 1099 return retval; 1100 1101 retval = -EPERM; 1102 v9ses = v9fs_dentry2v9ses(dentry); 1103 fid = v9fs_fid_lookup(dentry); 1104 if(IS_ERR(fid)) 1105 return PTR_ERR(fid); 1106 1107 v9fs_blank_wstat(&wstat); 1108 if (iattr->ia_valid & ATTR_MODE) 1109 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 1110 1111 if (iattr->ia_valid & ATTR_MTIME) 1112 wstat.mtime = iattr->ia_mtime.tv_sec; 1113 1114 if (iattr->ia_valid & ATTR_ATIME) 1115 wstat.atime = iattr->ia_atime.tv_sec; 1116 1117 if (iattr->ia_valid & ATTR_SIZE) 1118 wstat.length = iattr->ia_size; 1119 1120 if (v9fs_proto_dotu(v9ses)) { 1121 if (iattr->ia_valid & ATTR_UID) 1122 wstat.n_uid = iattr->ia_uid; 1123 1124 if (iattr->ia_valid & ATTR_GID) 1125 wstat.n_gid = iattr->ia_gid; 1126 } 1127 1128 /* Write all dirty data */ 1129 if (d_is_reg(dentry)) 1130 filemap_write_and_wait(d_inode(dentry)->i_mapping); 1131 1132 retval = p9_client_wstat(fid, &wstat); 1133 if (retval < 0) 1134 return retval; 1135 1136 if ((iattr->ia_valid & ATTR_SIZE) && 1137 iattr->ia_size != i_size_read(d_inode(dentry))) 1138 truncate_setsize(d_inode(dentry), iattr->ia_size); 1139 1140 v9fs_invalidate_inode_attr(d_inode(dentry)); 1141 1142 setattr_copy(d_inode(dentry), iattr); 1143 mark_inode_dirty(d_inode(dentry)); 1144 return 0; 1145} 1146 1147/** 1148 * v9fs_stat2inode - populate an inode structure with mistat info 1149 * @stat: Plan 9 metadata (mistat) structure 1150 * @inode: inode to populate 1151 * @sb: superblock of filesystem 1152 * 1153 */ 1154 1155void 1156v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 1157 struct super_block *sb) 1158{ 1159 umode_t mode; 1160 char ext[32]; 1161 char tag_name[14]; 1162 unsigned int i_nlink; 1163 struct v9fs_session_info *v9ses = sb->s_fs_info; 1164 struct v9fs_inode *v9inode = V9FS_I(inode); 1165 1166 set_nlink(inode, 1); 1167 1168 inode->i_atime.tv_sec = stat->atime; 1169 inode->i_mtime.tv_sec = stat->mtime; 1170 inode->i_ctime.tv_sec = stat->mtime; 1171 1172 inode->i_uid = v9ses->dfltuid; 1173 inode->i_gid = v9ses->dfltgid; 1174 1175 if (v9fs_proto_dotu(v9ses)) { 1176 inode->i_uid = stat->n_uid; 1177 inode->i_gid = stat->n_gid; 1178 } 1179 if ((S_ISREG(inode->i_mode)) || (S_ISDIR(inode->i_mode))) { 1180 if (v9fs_proto_dotu(v9ses) && (stat->extension[0] != '\0')) { 1181 /* 1182 * Hadlink support got added later to 1183 * to the .u extension. So there can be 1184 * server out there that doesn't support 1185 * this even with .u extension. So check 1186 * for non NULL stat->extension 1187 */ 1188 strlcpy(ext, stat->extension, sizeof(ext)); 1189 /* HARDLINKCOUNT %u */ 1190 sscanf(ext, "%13s %u", tag_name, &i_nlink); 1191 if (!strncmp(tag_name, "HARDLINKCOUNT", 13)) 1192 set_nlink(inode, i_nlink); 1193 } 1194 } 1195 mode = p9mode2perm(v9ses, stat); 1196 mode |= inode->i_mode & ~S_IALLUGO; 1197 inode->i_mode = mode; 1198 i_size_write(inode, stat->length); 1199 1200 /* not real number of blocks, but 512 byte ones ... */ 1201 inode->i_blocks = (i_size_read(inode) + 512 - 1) >> 9; 1202 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR; 1203} 1204 1205/** 1206 * v9fs_qid2ino - convert qid into inode number 1207 * @qid: qid to hash 1208 * 1209 * BUG: potential for inode number collisions? 1210 */ 1211 1212ino_t v9fs_qid2ino(struct p9_qid *qid) 1213{ 1214 u64 path = qid->path + 2; 1215 ino_t i = 0; 1216 1217 if (sizeof(ino_t) == sizeof(path)) 1218 memcpy(&i, &path, sizeof(ino_t)); 1219 else 1220 i = (ino_t) (path ^ (path >> 32)); 1221 1222 return i; 1223} 1224 1225/** 1226 * v9fs_readlink - read a symlink's location (internal version) 1227 * @dentry: dentry for symlink 1228 * @buffer: buffer to load symlink location into 1229 * @buflen: length of buffer 1230 * 1231 */ 1232 1233static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1234{ 1235 int retval; 1236 1237 struct v9fs_session_info *v9ses; 1238 struct p9_fid *fid; 1239 struct p9_wstat *st; 1240 1241 p9_debug(P9_DEBUG_VFS, " %pd\n", dentry); 1242 retval = -EPERM; 1243 v9ses = v9fs_dentry2v9ses(dentry); 1244 fid = v9fs_fid_lookup(dentry); 1245 if (IS_ERR(fid)) 1246 return PTR_ERR(fid); 1247 1248 if (!v9fs_proto_dotu(v9ses)) 1249 return -EBADF; 1250 1251 st = p9_client_stat(fid); 1252 if (IS_ERR(st)) 1253 return PTR_ERR(st); 1254 1255 if (!(st->mode & P9_DMSYMLINK)) { 1256 retval = -EINVAL; 1257 goto done; 1258 } 1259 1260 /* copy extension buffer into buffer */ 1261 retval = min(strlen(st->extension)+1, (size_t)buflen); 1262 memcpy(buffer, st->extension, retval); 1263 1264 p9_debug(P9_DEBUG_VFS, "%pd -> %s (%.*s)\n", 1265 dentry, st->extension, buflen, buffer); 1266 1267done: 1268 p9stat_free(st); 1269 kfree(st); 1270 return retval; 1271} 1272 1273/** 1274 * v9fs_vfs_follow_link - follow a symlink path 1275 * @dentry: dentry for symlink 1276 * @nd: nameidata 1277 * 1278 */ 1279 1280static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1281{ 1282 int len = 0; 1283 char *link = __getname(); 1284 1285 p9_debug(P9_DEBUG_VFS, "%pd\n", dentry); 1286 1287 if (!link) 1288 link = ERR_PTR(-ENOMEM); 1289 else { 1290 len = v9fs_readlink(dentry, link, PATH_MAX); 1291 1292 if (len < 0) { 1293 __putname(link); 1294 link = ERR_PTR(len); 1295 } else 1296 link[min(len, PATH_MAX-1)] = 0; 1297 } 1298 nd_set_link(nd, link); 1299 1300 return NULL; 1301} 1302 1303/** 1304 * v9fs_vfs_put_link - release a symlink path 1305 * @dentry: dentry for symlink 1306 * @nd: nameidata 1307 * @p: unused 1308 * 1309 */ 1310 1311void 1312v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1313{ 1314 char *s = nd_get_link(nd); 1315 1316 p9_debug(P9_DEBUG_VFS, " %pd %s\n", 1317 dentry, IS_ERR(s) ? "<error>" : s); 1318 if (!IS_ERR(s)) 1319 __putname(s); 1320} 1321 1322/** 1323 * v9fs_vfs_mkspecial - create a special file 1324 * @dir: inode to create special file in 1325 * @dentry: dentry to create 1326 * @perm: mode to create special file 1327 * @extension: 9p2000.u format extension string representing special file 1328 * 1329 */ 1330 1331static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1332 u32 perm, const char *extension) 1333{ 1334 struct p9_fid *fid; 1335 struct v9fs_session_info *v9ses; 1336 1337 v9ses = v9fs_inode2v9ses(dir); 1338 if (!v9fs_proto_dotu(v9ses)) { 1339 p9_debug(P9_DEBUG_ERROR, "not extended\n"); 1340 return -EPERM; 1341 } 1342 1343 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1344 P9_OREAD); 1345 if (IS_ERR(fid)) 1346 return PTR_ERR(fid); 1347 1348 v9fs_invalidate_inode_attr(dir); 1349 p9_client_clunk(fid); 1350 return 0; 1351} 1352 1353/** 1354 * v9fs_vfs_symlink - helper function to create symlinks 1355 * @dir: directory inode containing symlink 1356 * @dentry: dentry for symlink 1357 * @symname: symlink data 1358 * 1359 * See Also: 9P2000.u RFC for more information 1360 * 1361 */ 1362 1363static int 1364v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1365{ 1366 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%s\n", 1367 dir->i_ino, dentry, symname); 1368 1369 return v9fs_vfs_mkspecial(dir, dentry, P9_DMSYMLINK, symname); 1370} 1371 1372/** 1373 * v9fs_vfs_link - create a hardlink 1374 * @old_dentry: dentry for file to link to 1375 * @dir: inode destination for new link 1376 * @dentry: dentry for link 1377 * 1378 */ 1379 1380static int 1381v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1382 struct dentry *dentry) 1383{ 1384 int retval; 1385 char *name; 1386 struct p9_fid *oldfid; 1387 1388 p9_debug(P9_DEBUG_VFS, " %lu,%pd,%pd\n", 1389 dir->i_ino, dentry, old_dentry); 1390 1391 oldfid = v9fs_fid_clone(old_dentry); 1392 if (IS_ERR(oldfid)) 1393 return PTR_ERR(oldfid); 1394 1395 name = __getname(); 1396 if (unlikely(!name)) { 1397 retval = -ENOMEM; 1398 goto clunk_fid; 1399 } 1400 1401 sprintf(name, "%d\n", oldfid->fid); 1402 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1403 __putname(name); 1404 if (!retval) { 1405 v9fs_refresh_inode(oldfid, d_inode(old_dentry)); 1406 v9fs_invalidate_inode_attr(dir); 1407 } 1408clunk_fid: 1409 p9_client_clunk(oldfid); 1410 return retval; 1411} 1412 1413/** 1414 * v9fs_vfs_mknod - create a special file 1415 * @dir: inode destination for new link 1416 * @dentry: dentry for file 1417 * @mode: mode for creation 1418 * @rdev: device associated with special file 1419 * 1420 */ 1421 1422static int 1423v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 1424{ 1425 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1426 int retval; 1427 char *name; 1428 u32 perm; 1429 1430 p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n", 1431 dir->i_ino, dentry, mode, 1432 MAJOR(rdev), MINOR(rdev)); 1433 1434 if (!new_valid_dev(rdev)) 1435 return -EINVAL; 1436 1437 name = __getname(); 1438 if (!name) 1439 return -ENOMEM; 1440 /* build extension */ 1441 if (S_ISBLK(mode)) 1442 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1443 else if (S_ISCHR(mode)) 1444 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1445 else if (S_ISFIFO(mode)) 1446 *name = 0; 1447 else if (S_ISSOCK(mode)) 1448 *name = 0; 1449 else { 1450 __putname(name); 1451 return -EINVAL; 1452 } 1453 1454 perm = unixmode2p9mode(v9ses, mode); 1455 retval = v9fs_vfs_mkspecial(dir, dentry, perm, name); 1456 __putname(name); 1457 1458 return retval; 1459} 1460 1461int v9fs_refresh_inode(struct p9_fid *fid, struct inode *inode) 1462{ 1463 int umode; 1464 dev_t rdev; 1465 loff_t i_size; 1466 struct p9_wstat *st; 1467 struct v9fs_session_info *v9ses; 1468 1469 v9ses = v9fs_inode2v9ses(inode); 1470 st = p9_client_stat(fid); 1471 if (IS_ERR(st)) 1472 return PTR_ERR(st); 1473 /* 1474 * Don't update inode if the file type is different 1475 */ 1476 umode = p9mode2unixmode(v9ses, st, &rdev); 1477 if ((inode->i_mode & S_IFMT) != (umode & S_IFMT)) 1478 goto out; 1479 1480 spin_lock(&inode->i_lock); 1481 /* 1482 * We don't want to refresh inode->i_size, 1483 * because we may have cached data 1484 */ 1485 i_size = inode->i_size; 1486 v9fs_stat2inode(st, inode, inode->i_sb); 1487 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) 1488 inode->i_size = i_size; 1489 spin_unlock(&inode->i_lock); 1490out: 1491 p9stat_free(st); 1492 kfree(st); 1493 return 0; 1494} 1495 1496static const struct inode_operations v9fs_dir_inode_operations_dotu = { 1497 .create = v9fs_vfs_create, 1498 .lookup = v9fs_vfs_lookup, 1499 .atomic_open = v9fs_vfs_atomic_open, 1500 .symlink = v9fs_vfs_symlink, 1501 .link = v9fs_vfs_link, 1502 .unlink = v9fs_vfs_unlink, 1503 .mkdir = v9fs_vfs_mkdir, 1504 .rmdir = v9fs_vfs_rmdir, 1505 .mknod = v9fs_vfs_mknod, 1506 .rename = v9fs_vfs_rename, 1507 .getattr = v9fs_vfs_getattr, 1508 .setattr = v9fs_vfs_setattr, 1509}; 1510 1511static const struct inode_operations v9fs_dir_inode_operations = { 1512 .create = v9fs_vfs_create, 1513 .lookup = v9fs_vfs_lookup, 1514 .atomic_open = v9fs_vfs_atomic_open, 1515 .unlink = v9fs_vfs_unlink, 1516 .mkdir = v9fs_vfs_mkdir, 1517 .rmdir = v9fs_vfs_rmdir, 1518 .mknod = v9fs_vfs_mknod, 1519 .rename = v9fs_vfs_rename, 1520 .getattr = v9fs_vfs_getattr, 1521 .setattr = v9fs_vfs_setattr, 1522}; 1523 1524static const struct inode_operations v9fs_file_inode_operations = { 1525 .getattr = v9fs_vfs_getattr, 1526 .setattr = v9fs_vfs_setattr, 1527}; 1528 1529static const struct inode_operations v9fs_symlink_inode_operations = { 1530 .readlink = generic_readlink, 1531 .follow_link = v9fs_vfs_follow_link, 1532 .put_link = v9fs_vfs_put_link, 1533 .getattr = v9fs_vfs_getattr, 1534 .setattr = v9fs_vfs_setattr, 1535}; 1536 1537