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 * @extended: if .u extensions are active 136 */ 137 138 int v9fs_uflags2omode(int uflags, int extended) 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_TRUNC) 159 ret |= P9_OTRUNC; 160 161 if (extended) { 162 if (uflags & O_EXCL) 163 ret |= P9_OEXCL; 164 165 if (uflags & O_APPEND) 166 ret |= P9_OAPPEND; 167 } 168 169 return ret; 170 } 171 172 /** 173 * v9fs_blank_wstat - helper function to setup a 9P stat structure 174 * @v9ses: 9P session info (for determining extended mode) 175 * @wstat: structure to initialize 176 * 177 */ 178 179 static void 180 v9fs_blank_wstat(struct p9_wstat *wstat) 181 { 182 wstat->type = ~0; 183 wstat->dev = ~0; 184 wstat->qid.type = ~0; 185 wstat->qid.version = ~0; 186 *((long long *)&wstat->qid.path) = ~0; 187 wstat->mode = ~0; 188 wstat->atime = ~0; 189 wstat->mtime = ~0; 190 wstat->length = ~0; 191 wstat->name = NULL; 192 wstat->uid = NULL; 193 wstat->gid = NULL; 194 wstat->muid = NULL; 195 wstat->n_uid = ~0; 196 wstat->n_gid = ~0; 197 wstat->n_muid = ~0; 198 wstat->extension = NULL; 199 } 200 201 /** 202 * v9fs_get_inode - helper function to setup an inode 203 * @sb: superblock 204 * @mode: mode to setup inode with 205 * 206 */ 207 208 struct inode *v9fs_get_inode(struct super_block *sb, int mode) 209 { 210 struct inode *inode; 211 struct v9fs_session_info *v9ses = sb->s_fs_info; 212 213 P9_DPRINTK(P9_DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 214 215 inode = new_inode(sb); 216 if (inode) { 217 inode->i_mode = mode; 218 inode->i_uid = current->fsuid; 219 inode->i_gid = current->fsgid; 220 inode->i_blocks = 0; 221 inode->i_rdev = 0; 222 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 223 inode->i_mapping->a_ops = &v9fs_addr_operations; 224 225 switch (mode & S_IFMT) { 226 case S_IFIFO: 227 case S_IFBLK: 228 case S_IFCHR: 229 case S_IFSOCK: 230 if (!v9fs_extended(v9ses)) { 231 P9_DPRINTK(P9_DEBUG_ERROR, 232 "special files without extended mode\n"); 233 return ERR_PTR(-EINVAL); 234 } 235 init_special_inode(inode, inode->i_mode, 236 inode->i_rdev); 237 break; 238 case S_IFREG: 239 inode->i_op = &v9fs_file_inode_operations; 240 inode->i_fop = &v9fs_file_operations; 241 break; 242 case S_IFLNK: 243 if (!v9fs_extended(v9ses)) { 244 P9_DPRINTK(P9_DEBUG_ERROR, 245 "extended modes used w/o 9P2000.u\n"); 246 return ERR_PTR(-EINVAL); 247 } 248 inode->i_op = &v9fs_symlink_inode_operations; 249 break; 250 case S_IFDIR: 251 inc_nlink(inode); 252 if (v9fs_extended(v9ses)) 253 inode->i_op = &v9fs_dir_inode_operations_ext; 254 else 255 inode->i_op = &v9fs_dir_inode_operations; 256 inode->i_fop = &v9fs_dir_operations; 257 break; 258 default: 259 P9_DPRINTK(P9_DEBUG_ERROR, 260 "BAD mode 0x%x S_IFMT 0x%x\n", 261 mode, mode & S_IFMT); 262 return ERR_PTR(-EINVAL); 263 } 264 } else { 265 P9_EPRINTK(KERN_WARNING, "Problem allocating inode\n"); 266 return ERR_PTR(-ENOMEM); 267 } 268 return inode; 269 } 270 271 /* 272 static struct v9fs_fid* 273 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 274 { 275 int err; 276 int nfid; 277 struct v9fs_fid *ret; 278 struct v9fs_fcall *fcall; 279 280 nfid = v9fs_get_idpool(&v9ses->fidpool); 281 if (nfid < 0) { 282 eprintk(KERN_WARNING, "no free fids available\n"); 283 return ERR_PTR(-ENOSPC); 284 } 285 286 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 287 &fcall); 288 289 if (err < 0) { 290 if (fcall && fcall->id == RWALK) 291 goto clunk_fid; 292 293 PRINT_FCALL_ERROR("walk error", fcall); 294 v9fs_put_idpool(nfid, &v9ses->fidpool); 295 goto error; 296 } 297 298 kfree(fcall); 299 fcall = NULL; 300 ret = v9fs_fid_create(v9ses, nfid); 301 if (!ret) { 302 err = -ENOMEM; 303 goto clunk_fid; 304 } 305 306 err = v9fs_fid_insert(ret, dentry); 307 if (err < 0) { 308 v9fs_fid_destroy(ret); 309 goto clunk_fid; 310 } 311 312 return ret; 313 314 clunk_fid: 315 v9fs_t_clunk(v9ses, nfid); 316 317 error: 318 kfree(fcall); 319 return ERR_PTR(err); 320 } 321 */ 322 323 /** 324 * v9fs_inode_from_fid - populate an inode by issuing a attribute request 325 * @v9ses: session information 326 * @fid: fid to issue attribute request for 327 * @sb: superblock on which to create inode 328 * 329 */ 330 331 static struct inode * 332 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid, 333 struct super_block *sb) 334 { 335 int err, umode; 336 struct inode *ret; 337 struct p9_stat *st; 338 339 ret = NULL; 340 st = p9_client_stat(fid); 341 if (IS_ERR(st)) { 342 err = PTR_ERR(st); 343 st = NULL; 344 goto error; 345 } 346 347 umode = p9mode2unixmode(v9ses, st->mode); 348 ret = v9fs_get_inode(sb, umode); 349 if (IS_ERR(ret)) { 350 err = PTR_ERR(ret); 351 ret = NULL; 352 goto error; 353 } 354 355 v9fs_stat2inode(st, ret, sb); 356 ret->i_ino = v9fs_qid2ino(&st->qid); 357 kfree(st); 358 return ret; 359 360 error: 361 kfree(st); 362 if (ret) 363 iput(ret); 364 365 return ERR_PTR(err); 366 } 367 368 /** 369 * v9fs_remove - helper function to remove files and directories 370 * @dir: directory inode that is being deleted 371 * @file: dentry that is being deleted 372 * @rmdir: removing a directory 373 * 374 */ 375 376 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 377 { 378 struct inode *file_inode; 379 struct v9fs_session_info *v9ses; 380 struct p9_fid *v9fid; 381 382 P9_DPRINTK(P9_DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 383 rmdir); 384 385 file_inode = file->d_inode; 386 v9ses = v9fs_inode2v9ses(file_inode); 387 v9fid = v9fs_fid_clone(file); 388 if (IS_ERR(v9fid)) 389 return PTR_ERR(v9fid); 390 391 return p9_client_remove(v9fid); 392 } 393 394 static int 395 v9fs_open_created(struct inode *inode, struct file *file) 396 { 397 return 0; 398 } 399 400 401 /** 402 * v9fs_create - Create a file 403 * @v9ses: session information 404 * @dir: directory that dentry is being created in 405 * @dentry: dentry that is being created 406 * @perm: create permissions 407 * @mode: open mode 408 * @extension: 9p2000.u extension string to support devices, etc. 409 * 410 */ 411 static struct p9_fid * 412 v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir, 413 struct dentry *dentry, char *extension, u32 perm, u8 mode) 414 { 415 int err; 416 char *name; 417 struct p9_fid *dfid, *ofid, *fid; 418 struct inode *inode; 419 420 err = 0; 421 ofid = NULL; 422 fid = NULL; 423 name = (char *) dentry->d_name.name; 424 dfid = v9fs_fid_clone(dentry->d_parent); 425 if (IS_ERR(dfid)) { 426 err = PTR_ERR(dfid); 427 dfid = NULL; 428 goto error; 429 } 430 431 /* clone a fid to use for creation */ 432 ofid = p9_client_walk(dfid, 0, NULL, 1); 433 if (IS_ERR(ofid)) { 434 err = PTR_ERR(ofid); 435 ofid = NULL; 436 goto error; 437 } 438 439 err = p9_client_fcreate(ofid, name, perm, mode, extension); 440 if (err < 0) 441 goto error; 442 443 /* now walk from the parent so we can get unopened fid */ 444 fid = p9_client_walk(dfid, 1, &name, 0); 445 if (IS_ERR(fid)) { 446 err = PTR_ERR(fid); 447 fid = NULL; 448 goto error; 449 } else 450 dfid = NULL; 451 452 /* instantiate inode and assign the unopened fid to the dentry */ 453 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 454 if (IS_ERR(inode)) { 455 err = PTR_ERR(inode); 456 goto error; 457 } 458 459 if (v9ses->cache) 460 dentry->d_op = &v9fs_cached_dentry_operations; 461 else 462 dentry->d_op = &v9fs_dentry_operations; 463 464 d_instantiate(dentry, inode); 465 v9fs_fid_add(dentry, fid); 466 return ofid; 467 468 error: 469 if (dfid) 470 p9_client_clunk(dfid); 471 472 if (ofid) 473 p9_client_clunk(ofid); 474 475 if (fid) 476 p9_client_clunk(fid); 477 478 return ERR_PTR(err); 479 } 480 481 /** 482 * v9fs_vfs_create - VFS hook to create files 483 * @dir: directory inode that is being created 484 * @dentry: dentry that is being deleted 485 * @mode: create permissions 486 * @nd: path information 487 * 488 */ 489 490 static int 491 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 492 struct nameidata *nd) 493 { 494 int err; 495 u32 perm; 496 int flags; 497 struct v9fs_session_info *v9ses; 498 struct p9_fid *fid; 499 struct file *filp; 500 501 err = 0; 502 fid = NULL; 503 v9ses = v9fs_inode2v9ses(dir); 504 perm = unixmode2p9mode(v9ses, mode); 505 if (nd && nd->flags & LOOKUP_OPEN) 506 flags = nd->intent.open.flags - 1; 507 else 508 flags = O_RDWR; 509 510 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 511 v9fs_uflags2omode(flags, v9fs_extended(v9ses))); 512 if (IS_ERR(fid)) { 513 err = PTR_ERR(fid); 514 fid = NULL; 515 goto error; 516 } 517 518 /* if we are opening a file, assign the open fid to the file */ 519 if (nd && nd->flags & LOOKUP_OPEN) { 520 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 521 if (IS_ERR(filp)) { 522 err = PTR_ERR(filp); 523 goto error; 524 } 525 526 filp->private_data = fid; 527 } else 528 p9_client_clunk(fid); 529 530 return 0; 531 532 error: 533 if (fid) 534 p9_client_clunk(fid); 535 536 return err; 537 } 538 539 /** 540 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 541 * @dir: inode that is being unlinked 542 * @dentry: dentry that is being unlinked 543 * @mode: mode for new directory 544 * 545 */ 546 547 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 548 { 549 int err; 550 u32 perm; 551 struct v9fs_session_info *v9ses; 552 struct p9_fid *fid; 553 554 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 555 err = 0; 556 v9ses = v9fs_inode2v9ses(dir); 557 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 558 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 559 if (IS_ERR(fid)) { 560 err = PTR_ERR(fid); 561 fid = NULL; 562 } 563 564 if (fid) 565 p9_client_clunk(fid); 566 567 return err; 568 } 569 570 /** 571 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 572 * @dir: inode that is being walked from 573 * @dentry: dentry that is being walked to? 574 * @nameidata: path data 575 * 576 */ 577 578 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 579 struct nameidata *nameidata) 580 { 581 struct super_block *sb; 582 struct v9fs_session_info *v9ses; 583 struct p9_fid *dfid, *fid; 584 struct inode *inode; 585 char *name; 586 int result = 0; 587 588 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 589 dir, dentry->d_name.name, dentry, nameidata); 590 591 sb = dir->i_sb; 592 v9ses = v9fs_inode2v9ses(dir); 593 dfid = v9fs_fid_lookup(dentry->d_parent); 594 if (IS_ERR(dfid)) 595 return ERR_CAST(dfid); 596 597 name = (char *) dentry->d_name.name; 598 fid = p9_client_walk(dfid, 1, &name, 1); 599 if (IS_ERR(fid)) { 600 result = PTR_ERR(fid); 601 if (result == -ENOENT) { 602 d_add(dentry, NULL); 603 return NULL; 604 } 605 606 return ERR_PTR(result); 607 } 608 609 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 610 if (IS_ERR(inode)) { 611 result = PTR_ERR(inode); 612 inode = NULL; 613 goto error; 614 } 615 616 result = v9fs_fid_add(dentry, fid); 617 if (result < 0) 618 goto error; 619 620 if ((fid->qid.version) && (v9ses->cache)) 621 dentry->d_op = &v9fs_cached_dentry_operations; 622 else 623 dentry->d_op = &v9fs_dentry_operations; 624 625 d_add(dentry, inode); 626 return NULL; 627 628 error: 629 p9_client_clunk(fid); 630 631 return ERR_PTR(result); 632 } 633 634 /** 635 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 636 * @i: inode that is being unlinked 637 * @d: dentry that is being unlinked 638 * 639 */ 640 641 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 642 { 643 return v9fs_remove(i, d, 0); 644 } 645 646 /** 647 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 648 * @i: inode that is being unlinked 649 * @d: dentry that is being unlinked 650 * 651 */ 652 653 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 654 { 655 return v9fs_remove(i, d, 1); 656 } 657 658 /** 659 * v9fs_vfs_rename - VFS hook to rename an inode 660 * @old_dir: old dir inode 661 * @old_dentry: old dentry 662 * @new_dir: new dir inode 663 * @new_dentry: new dentry 664 * 665 */ 666 667 static int 668 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 669 struct inode *new_dir, struct dentry *new_dentry) 670 { 671 struct inode *old_inode; 672 struct v9fs_session_info *v9ses; 673 struct p9_fid *oldfid; 674 struct p9_fid *olddirfid; 675 struct p9_fid *newdirfid; 676 struct p9_wstat wstat; 677 int retval; 678 679 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 680 retval = 0; 681 old_inode = old_dentry->d_inode; 682 v9ses = v9fs_inode2v9ses(old_inode); 683 oldfid = v9fs_fid_lookup(old_dentry); 684 if (IS_ERR(oldfid)) 685 return PTR_ERR(oldfid); 686 687 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 688 if (IS_ERR(olddirfid)) { 689 retval = PTR_ERR(olddirfid); 690 goto done; 691 } 692 693 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 694 if (IS_ERR(newdirfid)) { 695 retval = PTR_ERR(newdirfid); 696 goto clunk_olddir; 697 } 698 699 /* 9P can only handle file rename in the same directory */ 700 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 701 P9_DPRINTK(P9_DEBUG_ERROR, 702 "old dir and new dir are different\n"); 703 retval = -EXDEV; 704 goto clunk_newdir; 705 } 706 707 v9fs_blank_wstat(&wstat); 708 wstat.muid = v9ses->uname; 709 wstat.name = (char *) new_dentry->d_name.name; 710 retval = p9_client_wstat(oldfid, &wstat); 711 712 clunk_newdir: 713 p9_client_clunk(newdirfid); 714 715 clunk_olddir: 716 p9_client_clunk(olddirfid); 717 718 done: 719 return retval; 720 } 721 722 /** 723 * v9fs_vfs_getattr - retrieve file metadata 724 * @mnt: mount information 725 * @dentry: file to get attributes on 726 * @stat: metadata structure to populate 727 * 728 */ 729 730 static int 731 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 732 struct kstat *stat) 733 { 734 int err; 735 struct v9fs_session_info *v9ses; 736 struct p9_fid *fid; 737 struct p9_stat *st; 738 739 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 740 err = -EPERM; 741 v9ses = v9fs_inode2v9ses(dentry->d_inode); 742 if (v9ses->cache == CACHE_LOOSE) 743 return simple_getattr(mnt, dentry, stat); 744 745 fid = v9fs_fid_lookup(dentry); 746 if (IS_ERR(fid)) 747 return PTR_ERR(fid); 748 749 st = p9_client_stat(fid); 750 if (IS_ERR(st)) 751 return PTR_ERR(st); 752 753 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 754 generic_fillattr(dentry->d_inode, stat); 755 756 kfree(st); 757 return 0; 758 } 759 760 /** 761 * v9fs_vfs_setattr - set file metadata 762 * @dentry: file whose metadata to set 763 * @iattr: metadata assignment structure 764 * 765 */ 766 767 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 768 { 769 int retval; 770 struct v9fs_session_info *v9ses; 771 struct p9_fid *fid; 772 struct p9_wstat wstat; 773 774 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 775 retval = -EPERM; 776 v9ses = v9fs_inode2v9ses(dentry->d_inode); 777 fid = v9fs_fid_lookup(dentry); 778 if(IS_ERR(fid)) 779 return PTR_ERR(fid); 780 781 v9fs_blank_wstat(&wstat); 782 if (iattr->ia_valid & ATTR_MODE) 783 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 784 785 if (iattr->ia_valid & ATTR_MTIME) 786 wstat.mtime = iattr->ia_mtime.tv_sec; 787 788 if (iattr->ia_valid & ATTR_ATIME) 789 wstat.atime = iattr->ia_atime.tv_sec; 790 791 if (iattr->ia_valid & ATTR_SIZE) 792 wstat.length = iattr->ia_size; 793 794 if (v9fs_extended(v9ses)) { 795 if (iattr->ia_valid & ATTR_UID) 796 wstat.n_uid = iattr->ia_uid; 797 798 if (iattr->ia_valid & ATTR_GID) 799 wstat.n_gid = iattr->ia_gid; 800 } 801 802 retval = p9_client_wstat(fid, &wstat); 803 if (retval >= 0) 804 retval = inode_setattr(dentry->d_inode, iattr); 805 806 return retval; 807 } 808 809 /** 810 * v9fs_stat2inode - populate an inode structure with mistat info 811 * @stat: Plan 9 metadata (mistat) structure 812 * @inode: inode to populate 813 * @sb: superblock of filesystem 814 * 815 */ 816 817 void 818 v9fs_stat2inode(struct p9_stat *stat, struct inode *inode, 819 struct super_block *sb) 820 { 821 int n; 822 char ext[32]; 823 struct v9fs_session_info *v9ses = sb->s_fs_info; 824 825 inode->i_nlink = 1; 826 827 inode->i_atime.tv_sec = stat->atime; 828 inode->i_mtime.tv_sec = stat->mtime; 829 inode->i_ctime.tv_sec = stat->mtime; 830 831 inode->i_uid = v9ses->dfltuid; 832 inode->i_gid = v9ses->dfltgid; 833 834 if (v9fs_extended(v9ses)) { 835 inode->i_uid = stat->n_uid; 836 inode->i_gid = stat->n_gid; 837 } 838 839 inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 840 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 841 char type = 0; 842 int major = -1; 843 int minor = -1; 844 845 n = stat->extension.len; 846 if (n > sizeof(ext)-1) 847 n = sizeof(ext)-1; 848 memmove(ext, stat->extension.str, n); 849 ext[n] = 0; 850 sscanf(ext, "%c %u %u", &type, &major, &minor); 851 switch (type) { 852 case 'c': 853 inode->i_mode &= ~S_IFBLK; 854 inode->i_mode |= S_IFCHR; 855 break; 856 case 'b': 857 break; 858 default: 859 P9_DPRINTK(P9_DEBUG_ERROR, 860 "Unknown special type %c (%.*s)\n", type, 861 stat->extension.len, stat->extension.str); 862 }; 863 inode->i_rdev = MKDEV(major, minor); 864 } else 865 inode->i_rdev = 0; 866 867 inode->i_size = stat->length; 868 869 /* not real number of blocks, but 512 byte ones ... */ 870 inode->i_blocks = (inode->i_size + 512 - 1) >> 9; 871 } 872 873 /** 874 * v9fs_qid2ino - convert qid into inode number 875 * @qid: qid to hash 876 * 877 * BUG: potential for inode number collisions? 878 */ 879 880 ino_t v9fs_qid2ino(struct p9_qid *qid) 881 { 882 u64 path = qid->path + 2; 883 ino_t i = 0; 884 885 if (sizeof(ino_t) == sizeof(path)) 886 memcpy(&i, &path, sizeof(ino_t)); 887 else 888 i = (ino_t) (path ^ (path >> 32)); 889 890 return i; 891 } 892 893 /** 894 * v9fs_readlink - read a symlink's location (internal version) 895 * @dentry: dentry for symlink 896 * @buffer: buffer to load symlink location into 897 * @buflen: length of buffer 898 * 899 */ 900 901 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 902 { 903 int retval; 904 905 struct v9fs_session_info *v9ses; 906 struct p9_fid *fid; 907 struct p9_stat *st; 908 909 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 910 retval = -EPERM; 911 v9ses = v9fs_inode2v9ses(dentry->d_inode); 912 fid = v9fs_fid_lookup(dentry); 913 if (IS_ERR(fid)) 914 return PTR_ERR(fid); 915 916 if (!v9fs_extended(v9ses)) 917 return -EBADF; 918 919 st = p9_client_stat(fid); 920 if (IS_ERR(st)) 921 return PTR_ERR(st); 922 923 if (!(st->mode & P9_DMSYMLINK)) { 924 retval = -EINVAL; 925 goto done; 926 } 927 928 /* copy extension buffer into buffer */ 929 if (st->extension.len < buflen) 930 buflen = st->extension.len + 1; 931 932 memmove(buffer, st->extension.str, buflen - 1); 933 buffer[buflen-1] = 0; 934 935 P9_DPRINTK(P9_DEBUG_VFS, 936 "%s -> %.*s (%s)\n", dentry->d_name.name, st->extension.len, 937 st->extension.str, buffer); 938 939 retval = buflen; 940 941 done: 942 kfree(st); 943 return retval; 944 } 945 946 /** 947 * v9fs_vfs_readlink - read a symlink's location 948 * @dentry: dentry for symlink 949 * @buffer: buffer to load symlink location into 950 * @buflen: length of buffer 951 * 952 */ 953 954 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 955 int buflen) 956 { 957 int retval; 958 int ret; 959 char *link = __getname(); 960 961 if (unlikely(!link)) 962 return -ENOMEM; 963 964 if (buflen > PATH_MAX) 965 buflen = PATH_MAX; 966 967 P9_DPRINTK(P9_DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 968 969 retval = v9fs_readlink(dentry, link, buflen); 970 971 if (retval > 0) { 972 if ((ret = copy_to_user(buffer, link, retval)) != 0) { 973 P9_DPRINTK(P9_DEBUG_ERROR, 974 "problem copying to user: %d\n", ret); 975 retval = ret; 976 } 977 } 978 979 __putname(link); 980 return retval; 981 } 982 983 /** 984 * v9fs_vfs_follow_link - follow a symlink path 985 * @dentry: dentry for symlink 986 * @nd: nameidata 987 * 988 */ 989 990 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 991 { 992 int len = 0; 993 char *link = __getname(); 994 995 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name); 996 997 if (!link) 998 link = ERR_PTR(-ENOMEM); 999 else { 1000 len = v9fs_readlink(dentry, link, PATH_MAX); 1001 1002 if (len < 0) { 1003 __putname(link); 1004 link = ERR_PTR(len); 1005 } else 1006 link[len] = 0; 1007 } 1008 nd_set_link(nd, link); 1009 1010 return NULL; 1011 } 1012 1013 /** 1014 * v9fs_vfs_put_link - release a symlink path 1015 * @dentry: dentry for symlink 1016 * @nd: nameidata 1017 * @p: unused 1018 * 1019 */ 1020 1021 static void 1022 v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1023 { 1024 char *s = nd_get_link(nd); 1025 1026 P9_DPRINTK(P9_DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 1027 if (!IS_ERR(s)) 1028 __putname(s); 1029 } 1030 1031 /** 1032 * v9fs_vfs_mkspecial - create a special file 1033 * @dir: inode to create special file in 1034 * @dentry: dentry to create 1035 * @mode: mode to create special file 1036 * @extension: 9p2000.u format extension string representing special file 1037 * 1038 */ 1039 1040 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1041 int mode, const char *extension) 1042 { 1043 u32 perm; 1044 struct v9fs_session_info *v9ses; 1045 struct p9_fid *fid; 1046 1047 v9ses = v9fs_inode2v9ses(dir); 1048 if (!v9fs_extended(v9ses)) { 1049 P9_DPRINTK(P9_DEBUG_ERROR, "not extended\n"); 1050 return -EPERM; 1051 } 1052 1053 perm = unixmode2p9mode(v9ses, mode); 1054 fid = v9fs_create(v9ses, dir, dentry, (char *) extension, perm, 1055 P9_OREAD); 1056 if (IS_ERR(fid)) 1057 return PTR_ERR(fid); 1058 1059 p9_client_clunk(fid); 1060 return 0; 1061 } 1062 1063 /** 1064 * v9fs_vfs_symlink - helper function to create symlinks 1065 * @dir: directory inode containing symlink 1066 * @dentry: dentry for symlink 1067 * @symname: symlink data 1068 * 1069 * See Also: 9P2000.u RFC for more information 1070 * 1071 */ 1072 1073 static int 1074 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1075 { 1076 P9_DPRINTK(P9_DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, 1077 dentry->d_name.name, symname); 1078 1079 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1080 } 1081 1082 /** 1083 * v9fs_vfs_link - create a hardlink 1084 * @old_dentry: dentry for file to link to 1085 * @dir: inode destination for new link 1086 * @dentry: dentry for link 1087 * 1088 */ 1089 1090 static int 1091 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1092 struct dentry *dentry) 1093 { 1094 int retval; 1095 struct p9_fid *oldfid; 1096 char *name; 1097 1098 P9_DPRINTK(P9_DEBUG_VFS, 1099 " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1100 old_dentry->d_name.name); 1101 1102 oldfid = v9fs_fid_clone(old_dentry); 1103 if (IS_ERR(oldfid)) 1104 return PTR_ERR(oldfid); 1105 1106 name = __getname(); 1107 if (unlikely(!name)) { 1108 retval = -ENOMEM; 1109 goto clunk_fid; 1110 } 1111 1112 sprintf(name, "%d\n", oldfid->fid); 1113 retval = v9fs_vfs_mkspecial(dir, dentry, P9_DMLINK, name); 1114 __putname(name); 1115 1116 clunk_fid: 1117 p9_client_clunk(oldfid); 1118 return retval; 1119 } 1120 1121 /** 1122 * v9fs_vfs_mknod - create a special file 1123 * @dir: inode destination for new link 1124 * @dentry: dentry for file 1125 * @mode: mode for creation 1126 * @rdev: device associated with special file 1127 * 1128 */ 1129 1130 static int 1131 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1132 { 1133 int retval; 1134 char *name; 1135 1136 P9_DPRINTK(P9_DEBUG_VFS, 1137 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1138 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1139 1140 if (!new_valid_dev(rdev)) 1141 return -EINVAL; 1142 1143 name = __getname(); 1144 if (!name) 1145 return -ENOMEM; 1146 /* build extension */ 1147 if (S_ISBLK(mode)) 1148 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1149 else if (S_ISCHR(mode)) 1150 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1151 else if (S_ISFIFO(mode)) 1152 *name = 0; 1153 else { 1154 __putname(name); 1155 return -EINVAL; 1156 } 1157 1158 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1159 __putname(name); 1160 1161 return retval; 1162 } 1163 1164 static const struct inode_operations v9fs_dir_inode_operations_ext = { 1165 .create = v9fs_vfs_create, 1166 .lookup = v9fs_vfs_lookup, 1167 .symlink = v9fs_vfs_symlink, 1168 .link = v9fs_vfs_link, 1169 .unlink = v9fs_vfs_unlink, 1170 .mkdir = v9fs_vfs_mkdir, 1171 .rmdir = v9fs_vfs_rmdir, 1172 .mknod = v9fs_vfs_mknod, 1173 .rename = v9fs_vfs_rename, 1174 .readlink = v9fs_vfs_readlink, 1175 .getattr = v9fs_vfs_getattr, 1176 .setattr = v9fs_vfs_setattr, 1177 }; 1178 1179 static const struct inode_operations v9fs_dir_inode_operations = { 1180 .create = v9fs_vfs_create, 1181 .lookup = v9fs_vfs_lookup, 1182 .unlink = v9fs_vfs_unlink, 1183 .mkdir = v9fs_vfs_mkdir, 1184 .rmdir = v9fs_vfs_rmdir, 1185 .mknod = v9fs_vfs_mknod, 1186 .rename = v9fs_vfs_rename, 1187 .getattr = v9fs_vfs_getattr, 1188 .setattr = v9fs_vfs_setattr, 1189 }; 1190 1191 static const struct inode_operations v9fs_file_inode_operations = { 1192 .getattr = v9fs_vfs_getattr, 1193 .setattr = v9fs_vfs_setattr, 1194 }; 1195 1196 static const struct inode_operations v9fs_symlink_inode_operations = { 1197 .readlink = v9fs_vfs_readlink, 1198 .follow_link = v9fs_vfs_follow_link, 1199 .put_link = v9fs_vfs_put_link, 1200 .getattr = v9fs_vfs_getattr, 1201 .setattr = v9fs_vfs_setattr, 1202 }; 1203