1 /* 2 * linux/fs/9p/vfs_inode.c 3 * 4 * This file contains vfs inode ops for the 9P2000 protocol. 5 * 6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com> 7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to: 20 * Free Software Foundation 21 * 51 Franklin Street, Fifth Floor 22 * Boston, MA 02111-1301 USA 23 * 24 */ 25 26 #include <linux/module.h> 27 #include <linux/errno.h> 28 #include <linux/fs.h> 29 #include <linux/file.h> 30 #include <linux/pagemap.h> 31 #include <linux/stat.h> 32 #include <linux/string.h> 33 #include <linux/inet.h> 34 #include <linux/namei.h> 35 #include <linux/idr.h> 36 #include <linux/sched.h> 37 #include <net/9p/9p.h> 38 #include <net/9p/client.h> 39 40 #include "v9fs.h" 41 #include "v9fs_vfs.h" 42 #include "fid.h" 43 44 static const struct inode_operations v9fs_dir_inode_operations; 45 static const struct inode_operations v9fs_dir_inode_operations_ext; 46 static const struct inode_operations v9fs_file_inode_operations; 47 static const struct inode_operations v9fs_symlink_inode_operations; 48 49 /** 50 * unixmode2p9mode - convert unix mode bits to plan 9 51 * @v9ses: v9fs session information 52 * @mode: mode to convert 53 * 54 */ 55 56 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 57 { 58 int res; 59 res = mode & 0777; 60 if (S_ISDIR(mode)) 61 res |= P9_DMDIR; 62 if (v9fs_extended(v9ses)) { 63 if (S_ISLNK(mode)) 64 res |= P9_DMSYMLINK; 65 if (v9ses->nodev == 0) { 66 if (S_ISSOCK(mode)) 67 res |= P9_DMSOCKET; 68 if (S_ISFIFO(mode)) 69 res |= P9_DMNAMEDPIPE; 70 if (S_ISBLK(mode)) 71 res |= P9_DMDEVICE; 72 if (S_ISCHR(mode)) 73 res |= P9_DMDEVICE; 74 } 75 76 if ((mode & S_ISUID) == S_ISUID) 77 res |= P9_DMSETUID; 78 if ((mode & S_ISGID) == S_ISGID) 79 res |= P9_DMSETGID; 80 if ((mode & S_ISVTX) == S_ISVTX) 81 res |= P9_DMSETVTX; 82 if ((mode & P9_DMLINK)) 83 res |= P9_DMLINK; 84 } 85 86 return res; 87 } 88 89 /** 90 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 91 * @v9ses: v9fs session information 92 * @mode: mode to convert 93 * 94 */ 95 96 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 97 { 98 int res; 99 100 res = mode & 0777; 101 102 if ((mode & P9_DMDIR) == P9_DMDIR) 103 res |= S_IFDIR; 104 else if ((mode & P9_DMSYMLINK) && (v9fs_extended(v9ses))) 105 res |= S_IFLNK; 106 else if ((mode & P9_DMSOCKET) && (v9fs_extended(v9ses)) 107 && (v9ses->nodev == 0)) 108 res |= S_IFSOCK; 109 else if ((mode & P9_DMNAMEDPIPE) && (v9fs_extended(v9ses)) 110 && (v9ses->nodev == 0)) 111 res |= S_IFIFO; 112 else if ((mode & P9_DMDEVICE) && (v9fs_extended(v9ses)) 113 && (v9ses->nodev == 0)) 114 res |= S_IFBLK; 115 else 116 res |= S_IFREG; 117 118 if (v9fs_extended(v9ses)) { 119 if ((mode & P9_DMSETUID) == P9_DMSETUID) 120 res |= S_ISUID; 121 122 if ((mode & P9_DMSETGID) == P9_DMSETGID) 123 res |= S_ISGID; 124 125 if ((mode & P9_DMSETVTX) == P9_DMSETVTX) 126 res |= S_ISVTX; 127 } 128 129 return res; 130 } 131 132 /** 133 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits 134 * @uflags: flags to convert 135 * 136 */ 137 138 int v9fs_uflags2omode(int uflags) 139 { 140 int ret; 141 142 ret = 0; 143 switch (uflags&3) { 144 default: 145 case O_RDONLY: 146 ret = P9_OREAD; 147 break; 148 149 case O_WRONLY: 150 ret = P9_OWRITE; 151 break; 152 153 case O_RDWR: 154 ret = P9_ORDWR; 155 break; 156 } 157 158 if (uflags & O_EXCL) 159 ret |= P9_OEXCL; 160 161 if (uflags & O_TRUNC) 162 ret |= P9_OTRUNC; 163 164 if (uflags & O_APPEND) 165 ret |= P9_OAPPEND; 166 167 return ret; 168 } 169 170 /** 171 * v9fs_blank_wstat - helper function to setup a 9P stat structure 172 * @v9ses: 9P session info (for determining extended mode) 173 * @wstat: structure to initialize 174 * 175 */ 176 177 static void 178 v9fs_blank_wstat(struct p9_wstat *wstat) 179 { 180 wstat->type = ~0; 181 wstat->dev = ~0; 182 wstat->qid.type = ~0; 183 wstat->qid.version = ~0; 184 *((long long *)&wstat->qid.path) = ~0; 185 wstat->mode = ~0; 186 wstat->atime = ~0; 187 wstat->mtime = ~0; 188 wstat->length = ~0; 189 wstat->name = NULL; 190 wstat->uid = NULL; 191 wstat->gid = NULL; 192 wstat->muid = NULL; 193 wstat->n_uid = ~0; 194 wstat->n_gid = ~0; 195 wstat->n_muid = ~0; 196 wstat->extension = NULL; 197 } 198 199 /** 200 * v9fs_get_inode - helper function to setup an inode 201 * @sb: superblock 202 * @mode: mode to setup inode with 203 * 204 */ 205 206 struct inode *v9fs_get_inode(struct super_block *sb, int mode) 207 { 208 struct inode *inode; 209 struct v9fs_session_info *v9ses = sb->s_fs_info; 210 211 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 212 213 inode = new_inode(sb); 214 if (inode) { 215 inode->i_mode = mode; 216 inode->i_uid = current->fsuid; 217 inode->i_gid = current->fsgid; 218 inode->i_blocks = 0; 219 inode->i_rdev = 0; 220 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 221 inode->i_mapping->a_ops = &v9fs_addr_operations; 222 223 switch (mode & S_IFMT) { 224 case S_IFIFO: 225 case S_IFBLK: 226 case S_IFCHR: 227 case S_IFSOCK: 228 if (!v9fs_extended(v9ses)) { 229 P9_DPRINTK(P9_DEBUG_ERROR, 230 "special files without extended mode\n"); 231 return ERR_PTR(-EINVAL); 232 } 233 init_special_inode(inode, inode->i_mode, 234 inode->i_rdev); 235 break; 236 case S_IFREG: 237 inode->i_op = &v9fs_file_inode_operations; 238 inode->i_fop = &v9fs_file_operations; 239 break; 240 case S_IFLNK: 241 if (!v9fs_extended(v9ses)) { 242 P9_DPRINTK(P9_DEBUG_ERROR, 243 "extended modes used w/o 9P2000.u\n"); 244 return ERR_PTR(-EINVAL); 245 } 246 inode->i_op = &v9fs_symlink_inode_operations; 247 break; 248 case S_IFDIR: 249 inc_nlink(inode); 250 if (v9fs_extended(v9ses)) 251 inode->i_op = &v9fs_dir_inode_operations_ext; 252 else 253 inode->i_op = &v9fs_dir_inode_operations; 254 inode->i_fop = &v9fs_dir_operations; 255 break; 256 default: 257 P9_DPRINTK(P9_DEBUG_ERROR, 258 "BAD mode 0x%x S_IFMT 0x%x\n", 259 mode, mode & S_IFMT); 260 return ERR_PTR(-EINVAL); 261 } 262 } else { 263 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 264 return ERR_PTR(-ENOMEM); 265 } 266 return inode; 267 } 268 269 /* 270 static struct v9fs_fid* 271 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 272 { 273 int err; 274 int nfid; 275 struct v9fs_fid *ret; 276 struct v9fs_fcall *fcall; 277 278 nfid = v9fs_get_idpool(&v9ses->fidpool); 279 if (nfid < 0) { 280 eprintk(KERN_WARNING, "no free fids available\n"); 281 return ERR_PTR(-ENOSPC); 282 } 283 284 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 285 &fcall); 286 287 if (err < 0) { 288 if (fcall && fcall->id == RWALK) 289 goto clunk_fid; 290 291 PRINT_FCALL_ERROR("walk error", fcall); 292 v9fs_put_idpool(nfid, &v9ses->fidpool); 293 goto error; 294 } 295 296 kfree(fcall); 297 fcall = NULL; 298 ret = v9fs_fid_create(v9ses, nfid); 299 if (!ret) { 300 err = -ENOMEM; 301 goto clunk_fid; 302 } 303 304 err = v9fs_fid_insert(ret, dentry); 305 if (err < 0) { 306 v9fs_fid_destroy(ret); 307 goto clunk_fid; 308 } 309 310 return ret; 311 312 clunk_fid: 313 v9fs_t_clunk(v9ses, nfid); 314 315 error: 316 kfree(fcall); 317 return ERR_PTR(err); 318 } 319 */ 320 321 /** 322 * v9fs_inode_from_fid - populate an inode by issuing a attribute request 323 * @v9ses: session information 324 * @fid: fid to issue attribute request for 325 * @sb: superblock on which to create inode 326 * 327 */ 328 329 static struct inode * 330 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 331 struct super_block *sb) 332 { 333 int err, umode; 334 struct inode *ret; 335 struct p9_stat *st; 336 337 ret = NULL; 338 st = p9_client_stat(fid); 339 if (IS_ERR(st)) { 340 err = PTR_ERR(st); 341 st = NULL; 342 goto error; 343 } 344 345 umode = p9mode2unixmode(v9ses, st->mode); 346 ret = v9fs_get_inode(sb, umode); 347 if (IS_ERR(ret)) { 348 err = PTR_ERR(ret); 349 ret = NULL; 350 goto error; 351 } 352 353 v9fs_stat2inode(st, ret, sb); 354 ret->i_ino = v9fs_qid2ino(&st->qid); 355 kfree(st); 356 return ret; 357 358 error: 359 kfree(st); 360 if (ret) 361 iput(ret); 362 363 return ERR_PTR(err); 364 } 365 366 /** 367 * v9fs_remove - helper function to remove files and directories 368 * @dir: directory inode that is being deleted 369 * @file: dentry that is being deleted 370 * @rmdir: removing a directory 371 * 372 */ 373 374 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 375 { 376 struct inode *file_inode; 377 struct v9fs_session_info *v9ses; 378 struct p9_fid *v9fid; 379 380 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 381 rmdir); 382 383 file_inode = file->d_inode; 384 v9ses = v9fs_inode2v9ses(file_inode); 385 v9fid = v9fs_fid_clone(file); 386 if (IS_ERR(v9fid)) 387 return PTR_ERR(v9fid); 388 389 return p9_client_remove(v9fid); 390 } 391 392 static int 393 v9fs_open_created(struct inode *inode, struct file *file) 394 { 395 return 0; 396 } 397 398 399 /** 400 * v9fs_create - Create a file 401 * @v9ses: session information 402 * @dir: directory that dentry is being created in 403 * @dentry: dentry that is being created 404 * @perm: create permissions 405 * @mode: open mode 406 * @extension: 9p2000.u extension string to support devices, etc. 407 * 408 */ 409 static struct p9_fid * 410 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 411 struct dentry *dentry, char *extension, u32 perm, u8 mode) 412 { 413 int err; 414 char *name; 415 struct p9_fid *dfid, *ofid, *fid; 416 struct inode *inode; 417 418 err = 0; 419 ofid = NULL; 420 fid = NULL; 421 name = (char *) dentry->d_name.name; 422 dfid = v9fs_fid_clone(dentry->d_parent); 423 if (IS_ERR(dfid)) { 424 err = PTR_ERR(dfid); 425 dfid = NULL; 426 goto error; 427 } 428 429 /* clone a fid to use for creation */ 430 ofid = p9_client_walk(dfid, 0, NULL, 1); 431 if (IS_ERR(ofid)) { 432 err = PTR_ERR(ofid); 433 ofid = NULL; 434 goto error; 435 } 436 437 err = p9_client_fcreate(ofid, name, perm, mode, extension); 438 if (err < 0) 439 goto error; 440 441 /* now walk from the parent so we can get unopened fid */ 442 fid = p9_client_walk(dfid, 1, &name, 0); 443 if (IS_ERR(fid)) { 444 err = PTR_ERR(fid); 445 fid = NULL; 446 goto error; 447 } else 448 dfid = NULL; 449 450 /* instantiate inode and assign the unopened fid to the dentry */ 451 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 452 if (IS_ERR(inode)) { 453 err = PTR_ERR(inode); 454 goto error; 455 } 456 457 if (v9ses->cache) 458 dentry->d_op = &v9fs_cached_dentry_operations; 459 else 460 dentry->d_op = &v9fs_dentry_operations; 461 462 d_instantiate(dentry, inode); 463 v9fs_fid_add(dentry, fid); 464 return ofid; 465 466 error: 467 if (dfid) 468 p9_client_clunk(dfid); 469 470 if (ofid) 471 p9_client_clunk(ofid); 472 473 if (fid) 474 p9_client_clunk(fid); 475 476 return ERR_PTR(err); 477 } 478 479 /** 480 * v9fs_vfs_create - VFS hook to create files 481 * @dir: directory inode that is being created 482 * @dentry: dentry that is being deleted 483 * @mode: create permissions 484 * @nd: path information 485 * 486 */ 487 488 static int 489 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 490 struct nameidata *nd) 491 { 492 int err; 493 u32 perm; 494 int flags; 495 struct v9fs_session_info *v9ses; 496 struct p9_fid *fid; 497 struct file *filp; 498 499 err = 0; 500 fid = NULL; 501 v9ses = v9fs_inode2v9ses(dir); 502 perm = unixmode2p9mode(v9ses, mode); 503 if (nd && nd->flags & LOOKUP_OPEN) 504 flags = nd->intent.open.flags - 1; 505 else 506 flags = O_RDWR; 507 508 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 509 v9fs_uflags2omode(flags)); 510 if (IS_ERR(fid)) { 511 err = PTR_ERR(fid); 512 fid = NULL; 513 goto error; 514 } 515 516 /* if we are opening a file, assign the open fid to the file */ 517 if (nd && nd->flags & LOOKUP_OPEN) { 518 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 519 if (IS_ERR(filp)) { 520 err = PTR_ERR(filp); 521 goto error; 522 } 523 524 filp->private_data = fid; 525 } else 526 p9_client_clunk(fid); 527 528 return 0; 529 530 error: 531 if (fid) 532 p9_client_clunk(fid); 533 534 return err; 535 } 536 537 /** 538 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 539 * @dir: inode that is being unlinked 540 * @dentry: dentry that is being unlinked 541 * @mode: mode for new directory 542 * 543 */ 544 545 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 546 { 547 int err; 548 u32 perm; 549 struct v9fs_session_info *v9ses; 550 struct p9_fid *fid; 551 552 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 553 err = 0; 554 v9ses = v9fs_inode2v9ses(dir); 555 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 556 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 557 if (IS_ERR(fid)) { 558 err = PTR_ERR(fid); 559 fid = NULL; 560 } 561 562 if (fid) 563 p9_client_clunk(fid); 564 565 return err; 566 } 567 568 /** 569 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 570 * @dir: inode that is being walked from 571 * @dentry: dentry that is being walked to? 572 * @nameidata: path data 573 * 574 */ 575 576 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 577 struct nameidata *nameidata) 578 { 579 struct super_block *sb; 580 struct v9fs_session_info *v9ses; 581 struct p9_fid *dfid, *fid; 582 struct inode *inode; 583 char *name; 584 int result = 0; 585 586 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 587 dir, dentry->d_name.name, dentry, nameidata); 588 589 sb = dir->i_sb; 590 v9ses = v9fs_inode2v9ses(dir); 591 dfid = v9fs_fid_lookup(dentry->d_parent); 592 if (IS_ERR(dfid)) 593 return ERR_CAST(dfid); 594 595 name = (char *) dentry->d_name.name; 596 fid = p9_client_walk(dfid, 1, &name, 1); 597 if (IS_ERR(fid)) { 598 result = PTR_ERR(fid); 599 if (result == -ENOENT) { 600 d_add(dentry, NULL); 601 return NULL; 602 } 603 604 return ERR_PTR(result); 605 } 606 607 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 608 if (IS_ERR(inode)) { 609 result = PTR_ERR(inode); 610 inode = NULL; 611 goto error; 612 } 613 614 result = v9fs_fid_add(dentry, fid); 615 if (result < 0) 616 goto error; 617 618 if ((fid->qid.version) && (v9ses->cache)) 619 dentry->d_op = &v9fs_cached_dentry_operations; 620 else 621 dentry->d_op = &v9fs_dentry_operations; 622 623 d_add(dentry, inode); 624 return NULL; 625 626 error: 627 if (fid) 628 p9_client_clunk(fid); 629 630 return ERR_PTR(result); 631 } 632 633 /** 634 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 635 * @i: inode that is being unlinked 636 * @d: dentry that is being unlinked 637 * 638 */ 639 640 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 641 { 642 return v9fs_remove(i, d, 0); 643 } 644 645 /** 646 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 647 * @i: inode that is being unlinked 648 * @d: dentry that is being unlinked 649 * 650 */ 651 652 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 653 { 654 return v9fs_remove(i, d, 1); 655 } 656 657 /** 658 * v9fs_vfs_rename - VFS hook to rename an inode 659 * @old_dir: old dir inode 660 * @old_dentry: old dentry 661 * @new_dir: new dir inode 662 * @new_dentry: new dentry 663 * 664 */ 665 666 static int 667 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 668 struct inode *new_dir, struct dentry *new_dentry) 669 { 670 struct inode *old_inode; 671 struct v9fs_session_info *v9ses; 672 struct p9_fid *oldfid; 673 struct p9_fid *olddirfid; 674 struct p9_fid *newdirfid; 675 struct p9_wstat wstat; 676 int retval; 677 678 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 679 retval = 0; 680 old_inode = old_dentry->d_inode; 681 v9ses = v9fs_inode2v9ses(old_inode); 682 oldfid = v9fs_fid_lookup(old_dentry); 683 if (IS_ERR(oldfid)) 684 return PTR_ERR(oldfid); 685 686 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 687 if (IS_ERR(olddirfid)) { 688 retval = PTR_ERR(olddirfid); 689 goto done; 690 } 691 692 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 693 if (IS_ERR(newdirfid)) { 694 retval = PTR_ERR(newdirfid); 695 goto clunk_olddir; 696 } 697 698 /* 9P can only handle file rename in the same directory */ 699 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 700 P9_DPRINTK(P9_DEBUG_ERROR, 701 "old dir and new dir are different\n"); 702 retval = -EXDEV; 703 goto clunk_newdir; 704 } 705 706 v9fs_blank_wstat(&wstat); 707 wstat.muid = v9ses->uname; 708 wstat.name = (char *) new_dentry->d_name.name; 709 retval = p9_client_wstat(oldfid, &wstat); 710 711 clunk_newdir: 712 p9_client_clunk(newdirfid); 713 714 clunk_olddir: 715 p9_client_clunk(olddirfid); 716 717 done: 718 return retval; 719 } 720 721 /** 722 * v9fs_vfs_getattr - retrieve file metadata 723 * @mnt: mount information 724 * @dentry: file to get attributes on 725 * @stat: metadata structure to populate 726 * 727 */ 728 729 static int 730 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 731 struct kstat *stat) 732 { 733 int err; 734 struct v9fs_session_info *v9ses; 735 struct p9_fid *fid; 736 struct p9_stat *st; 737 738 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 739 err = -EPERM; 740 v9ses = v9fs_inode2v9ses(dentry->d_inode); 741 if (v9ses->cache == CACHE_LOOSE) 742 return simple_getattr(mnt, dentry, stat); 743 744 fid = v9fs_fid_lookup(dentry); 745 if (IS_ERR(fid)) 746 return PTR_ERR(fid); 747 748 st = p9_client_stat(fid); 749 if (IS_ERR(st)) 750 return PTR_ERR(st); 751 752 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 753 generic_fillattr(dentry->d_inode, stat); 754 755 kfree(st); 756 return 0; 757 } 758 759 /** 760 * v9fs_vfs_setattr - set file metadata 761 * @dentry: file whose metadata to set 762 * @iattr: metadata assignment structure 763 * 764 */ 765 766 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 767 { 768 int retval; 769 struct v9fs_session_info *v9ses; 770 struct p9_fid *fid; 771 struct p9_wstat wstat; 772 773 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 774 retval = -EPERM; 775 v9ses = v9fs_inode2v9ses(dentry->d_inode); 776 fid = v9fs_fid_lookup(dentry); 777 if(IS_ERR(fid)) 778 return PTR_ERR(fid); 779 780 v9fs_blank_wstat(&wstat); 781 if (iattr->ia_valid & ATTR_MODE) 782 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 783 784 if (iattr->ia_valid & ATTR_MTIME) 785 wstat.mtime = iattr->ia_mtime.tv_sec; 786 787 if (iattr->ia_valid & ATTR_ATIME) 788 wstat.atime = iattr->ia_atime.tv_sec; 789 790 if (iattr->ia_valid & ATTR_SIZE) 791 wstat.length = iattr->ia_size; 792 793 if (v9fs_extended(v9ses)) { 794 if (iattr->ia_valid & ATTR_UID) 795 wstat.n_uid = iattr->ia_uid; 796 797 if (iattr->ia_valid & ATTR_GID) 798 wstat.n_gid = iattr->ia_gid; 799 } 800 801 retval = p9_client_wstat(fid, &wstat); 802 if (retval >= 0) 803 retval = inode_setattr(dentry->d_inode, iattr); 804 805 return retval; 806 } 807 808 /** 809 * v9fs_stat2inode - populate an inode structure with mistat info 810 * @stat: Plan 9 metadata (mistat) structure 811 * @inode: inode to populate 812 * @sb: superblock of filesystem 813 * 814 */ 815 816 void 817 v9fs_stat2inode(struct p9_stat *stat, struct inode *inode, 818 struct super_block *sb) 819 { 820 int n; 821 char ext[32]; 822 struct v9fs_session_info *v9ses = sb->s_fs_info; 823 824 inode->i_nlink = 1; 825 826 inode->i_atime.tv_sec = stat->atime; 827 inode->i_mtime.tv_sec = stat->mtime; 828 inode->i_ctime.tv_sec = stat->mtime; 829 830 inode->i_uid = v9ses->dfltuid; 831 inode->i_gid = v9ses->dfltgid; 832 833 if (v9fs_extended(v9ses)) { 834 inode->i_uid = stat->n_uid; 835 inode->i_gid = stat->n_gid; 836 } 837 838 inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 839 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 840 char type = 0; 841 int major = -1; 842 int minor = -1; 843 844 n = stat->extension.len; 845 if (n > sizeof(ext)-1) 846 n = sizeof(ext)-1; 847 memmove(ext, stat->extension.str, n); 848 ext[n] = 0; 849 sscanf(ext, "%c %u %u", &type, &major, &minor); 850 switch (type) { 851 case 'c': 852 inode->i_mode &= ~S_IFBLK; 853 inode->i_mode |= S_IFCHR; 854 break; 855 case 'b': 856 break; 857 default: 858 P9_DPRINTK(P9_DEBUG_ERROR, 859 "Unknown special type %c (%.*s)\n", type, 860 stat->extension.len, stat->extension.str); 861 }; 862 inode->i_rdev = MKDEV(major, minor); 863 } else 864 inode->i_rdev = 0; 865 866 inode->i_size = stat->length; 867 868 /* not real number of blocks, but 512 byte ones ... */ 869 inode->i_blocks = (inode->i_size + 512 - 1) >> 9; 870 } 871 872 /** 873 * v9fs_qid2ino - convert qid into inode number 874 * @qid: qid to hash 875 * 876 * BUG: potential for inode number collisions? 877 */ 878 879 ino_t v9fs_qid2ino(struct p9_qid *qid) 880 { 881 u64 path = qid->path + 2; 882 ino_t i = 0; 883 884 if (sizeof(ino_t) == sizeof(path)) 885 memcpy(&i, &path, sizeof(ino_t)); 886 else 887 i = (ino_t) (path ^ (path >> 32)); 888 889 return i; 890 } 891 892 /** 893 * v9fs_readlink - read a symlink's location (internal version) 894 * @dentry: dentry for symlink 895 * @buffer: buffer to load symlink location into 896 * @buflen: length of buffer 897 * 898 */ 899 900 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 901 { 902 int retval; 903 904 struct v9fs_session_info *v9ses; 905 struct p9_fid *fid; 906 struct p9_stat *st; 907 908 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 909 retval = -EPERM; 910 v9ses = v9fs_inode2v9ses(dentry->d_inode); 911 fid = v9fs_fid_lookup(dentry); 912 if (IS_ERR(fid)) 913 return PTR_ERR(fid); 914 915 if (!v9fs_extended(v9ses)) 916 return -EBADF; 917 918 st = p9_client_stat(fid); 919 if (IS_ERR(st)) 920 return PTR_ERR(st); 921 922 if (!(st->mode & P9_DMSYMLINK)) { 923 retval = -EINVAL; 924 goto done; 925 } 926 927 /* copy extension buffer into buffer */ 928 if (st->extension.len < buflen) 929 buflen = st->extension.len + 1; 930 931 memmove(buffer, st->extension.str, buflen - 1); 932 buffer[buflen-1] = 0; 933 934 P9_DPRINTK(P9_DEBUG_VFS, 935 "%s -> %.*s (%s)\n", dentry->d_name.name, st->extension.len, 936 st->extension.str, buffer); 937 938 retval = buflen; 939 940 done: 941 kfree(st); 942 return retval; 943 } 944 945 /** 946 * v9fs_vfs_readlink - read a symlink's location 947 * @dentry: dentry for symlink 948 * @buffer: buffer to load symlink location into 949 * @buflen: length of buffer 950 * 951 */ 952 953 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 954 int buflen) 955 { 956 int retval; 957 int ret; 958 char *link = __getname(); 959 960 if (unlikely(!link)) 961 return -ENOMEM; 962 963 if (buflen > PATH_MAX) 964 buflen = PATH_MAX; 965 966 P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 967 968 retval = v9fs_readlink(dentry, link, buflen); 969 970 if (retval > 0) { 971 if ((ret = copy_to_user(buffer, link, retval)) != 0) { 972 P9_DPRINTK(P9_DEBUG_ERROR, 973 "problem copying to user: %d\n", ret); 974 retval = ret; 975 } 976 } 977 978 __putname(link); 979 return retval; 980 } 981 982 /** 983 * v9fs_vfs_follow_link - follow a symlink path 984 * @dentry: dentry for symlink 985 * @nd: nameidata 986 * 987 */ 988 989 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 990 { 991 int len = 0; 992 char *link = __getname(); 993 994 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 995 996 if (!link) 997 link = ERR_PTR(-ENOMEM); 998 else { 999 len = v9fs_readlink(dentry, link, PATH_MAX); 1000 1001 if (len < 0) { 1002 __putname(link); 1003 link = ERR_PTR(len); 1004 } else 1005 link[len] = 0; 1006 } 1007 nd_set_link(nd, link); 1008 1009 return NULL; 1010 } 1011 1012 /** 1013 * v9fs_vfs_put_link - release a symlink path 1014 * @dentry: dentry for symlink 1015 * @nd: nameidata 1016 * @p: unused 1017 * 1018 */ 1019 1020 static void 1021 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1022 { 1023 char *s = nd_get_link(nd); 1024 1025 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 1026 if (!IS_ERR(s)) 1027 __putname(s); 1028 } 1029 1030 /** 1031 * v9fs_vfs_mkspecial - create a special file 1032 * @dir: inode to create special file in 1033 * @dentry: dentry to create 1034 * @mode: mode to create special file 1035 * @extension: 9p2000.u format extension string representing special file 1036 * 1037 */ 1038 1039 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1040 int mode, const char *extension) 1041 { 1042 u32 perm; 1043 struct v9fs_session_info *v9ses; 1044 struct p9_fid *fid; 1045 1046 v9ses = v9fs_inode2v9ses(dir); 1047 if (!v9fs_extended(v9ses)) { 1048 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 1049 return -EPERM; 1050 } 1051 1052 perm = unixmode2p9mode(v9ses, mode); 1053 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1054 P9_OREAD); 1055 if (IS_ERR(fid)) 1056 return PTR_ERR(fid); 1057 1058 p9_client_clunk(fid); 1059 return 0; 1060 } 1061 1062 /** 1063 * v9fs_vfs_symlink - helper function to create symlinks 1064 * @dir: directory inode containing symlink 1065 * @dentry: dentry for symlink 1066 * @symname: symlink data 1067 * 1068 * See Also: 9P2000.u RFC for more information 1069 * 1070 */ 1071 1072 static int 1073 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1074 { 1075 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1076 dentry->d_name.name, symname); 1077 1078 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1079 } 1080 1081 /** 1082 * v9fs_vfs_link - create a hardlink 1083 * @old_dentry: dentry for file to link to 1084 * @dir: inode destination for new link 1085 * @dentry: dentry for link 1086 * 1087 */ 1088 1089 static int 1090 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1091 struct dentry *dentry) 1092 { 1093 int retval; 1094 struct p9_fid *oldfid; 1095 char *name; 1096 1097 P9_DPRINTK(P9_DEBUG_VFS, 1098 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1099 old_dentry->d_name.name); 1100 1101 oldfid = v9fs_fid_clone(old_dentry); 1102 if (IS_ERR(oldfid)) 1103 return PTR_ERR(oldfid); 1104 1105 name = __getname(); 1106 if (unlikely(!name)) { 1107 retval = -ENOMEM; 1108 goto clunk_fid; 1109 } 1110 1111 sprintf(name, "%d\n", oldfid->fid); 1112 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1113 __putname(name); 1114 1115 clunk_fid: 1116 p9_client_clunk(oldfid); 1117 return retval; 1118 } 1119 1120 /** 1121 * v9fs_vfs_mknod - create a special file 1122 * @dir: inode destination for new link 1123 * @dentry: dentry for file 1124 * @mode: mode for creation 1125 * @rdev: device associated with special file 1126 * 1127 */ 1128 1129 static int 1130 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1131 { 1132 int retval; 1133 char *name; 1134 1135 P9_DPRINTK(P9_DEBUG_VFS, 1136 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1137 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1138 1139 if (!new_valid_dev(rdev)) 1140 return -EINVAL; 1141 1142 name = __getname(); 1143 if (!name) 1144 return -ENOMEM; 1145 /* build extension */ 1146 if (S_ISBLK(mode)) 1147 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1148 else if (S_ISCHR(mode)) 1149 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1150 else if (S_ISFIFO(mode)) 1151 *name = 0; 1152 else { 1153 __putname(name); 1154 return -EINVAL; 1155 } 1156 1157 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1158 __putname(name); 1159 1160 return retval; 1161 } 1162 1163 static const struct inode_operations v9fs_dir_inode_operations_ext = { 1164 .create = v9fs_vfs_create, 1165 .lookup = v9fs_vfs_lookup, 1166 .symlink = v9fs_vfs_symlink, 1167 .link = v9fs_vfs_link, 1168 .unlink = v9fs_vfs_unlink, 1169 .mkdir = v9fs_vfs_mkdir, 1170 .rmdir = v9fs_vfs_rmdir, 1171 .mknod = v9fs_vfs_mknod, 1172 .rename = v9fs_vfs_rename, 1173 .readlink = v9fs_vfs_readlink, 1174 .getattr = v9fs_vfs_getattr, 1175 .setattr = v9fs_vfs_setattr, 1176 }; 1177 1178 static const struct inode_operations v9fs_dir_inode_operations = { 1179 .create = v9fs_vfs_create, 1180 .lookup = v9fs_vfs_lookup, 1181 .unlink = v9fs_vfs_unlink, 1182 .mkdir = v9fs_vfs_mkdir, 1183 .rmdir = v9fs_vfs_rmdir, 1184 .mknod = v9fs_vfs_mknod, 1185 .rename = v9fs_vfs_rename, 1186 .getattr = v9fs_vfs_getattr, 1187 .setattr = v9fs_vfs_setattr, 1188 }; 1189 1190 static const struct inode_operations v9fs_file_inode_operations = { 1191 .getattr = v9fs_vfs_getattr, 1192 .setattr = v9fs_vfs_setattr, 1193 }; 1194 1195 static const struct inode_operations v9fs_symlink_inode_operations = { 1196 .readlink = v9fs_vfs_readlink, 1197 .follow_link = v9fs_vfs_follow_link, 1198 .put_link = v9fs_vfs_put_link, 1199 .getattr = v9fs_vfs_getattr, 1200 .setattr = v9fs_vfs_setattr, 1201 }; 1202