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_wstat *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 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 421 422 err = 0; 423 ofid = NULL; 424 fid = NULL; 425 name = (char *) dentry->d_name.name; 426 dfid = v9fs_fid_clone(dentry->d_parent); 427 if (IS_ERR(dfid)) { 428 err = PTR_ERR(dfid); 429 P9_DPRINTK(P9_DEBUG_VFS, "fid clone failed %d\n", err); 430 dfid = NULL; 431 goto error; 432 } 433 434 /* clone a fid to use for creation */ 435 ofid = p9_client_walk(dfid, 0, NULL, 1); 436 if (IS_ERR(ofid)) { 437 err = PTR_ERR(ofid); 438 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 439 ofid = NULL; 440 goto error; 441 } 442 443 err = p9_client_fcreate(ofid, name, perm, mode, extension); 444 if (err < 0) { 445 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_fcreate failed %d\n", err); 446 goto error; 447 } 448 449 /* now walk from the parent so we can get unopened fid */ 450 fid = p9_client_walk(dfid, 1, &name, 0); 451 if (IS_ERR(fid)) { 452 err = PTR_ERR(fid); 453 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err); 454 fid = NULL; 455 goto error; 456 } else 457 dfid = NULL; 458 459 /* instantiate inode and assign the unopened fid to the dentry */ 460 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 461 if (IS_ERR(inode)) { 462 err = PTR_ERR(inode); 463 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err); 464 goto error; 465 } 466 467 if (v9ses->cache) 468 dentry->d_op = &v9fs_cached_dentry_operations; 469 else 470 dentry->d_op = &v9fs_dentry_operations; 471 472 d_instantiate(dentry, inode); 473 v9fs_fid_add(dentry, fid); 474 return ofid; 475 476 error: 477 if (dfid) 478 p9_client_clunk(dfid); 479 480 if (ofid) 481 p9_client_clunk(ofid); 482 483 if (fid) 484 p9_client_clunk(fid); 485 486 return ERR_PTR(err); 487 } 488 489 /** 490 * v9fs_vfs_create - VFS hook to create files 491 * @dir: directory inode that is being created 492 * @dentry: dentry that is being deleted 493 * @mode: create permissions 494 * @nd: path information 495 * 496 */ 497 498 static int 499 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 500 struct nameidata *nd) 501 { 502 int err; 503 u32 perm; 504 int flags; 505 struct v9fs_session_info *v9ses; 506 struct p9_fid *fid; 507 struct file *filp; 508 509 err = 0; 510 fid = NULL; 511 v9ses = v9fs_inode2v9ses(dir); 512 perm = unixmode2p9mode(v9ses, mode); 513 if (nd && nd->flags & LOOKUP_OPEN) 514 flags = nd->intent.open.flags - 1; 515 else 516 flags = O_RDWR; 517 518 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, 519 v9fs_uflags2omode(flags, v9fs_extended(v9ses))); 520 if (IS_ERR(fid)) { 521 err = PTR_ERR(fid); 522 fid = NULL; 523 goto error; 524 } 525 526 /* if we are opening a file, assign the open fid to the file */ 527 if (nd && nd->flags & LOOKUP_OPEN) { 528 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 529 if (IS_ERR(filp)) { 530 err = PTR_ERR(filp); 531 goto error; 532 } 533 534 filp->private_data = fid; 535 } else 536 p9_client_clunk(fid); 537 538 return 0; 539 540 error: 541 if (fid) 542 p9_client_clunk(fid); 543 544 return err; 545 } 546 547 /** 548 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 549 * @dir: inode that is being unlinked 550 * @dentry: dentry that is being unlinked 551 * @mode: mode for new directory 552 * 553 */ 554 555 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 556 { 557 int err; 558 u32 perm; 559 struct v9fs_session_info *v9ses; 560 struct p9_fid *fid; 561 562 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name); 563 err = 0; 564 v9ses = v9fs_inode2v9ses(dir); 565 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 566 fid = v9fs_create(v9ses, dir, dentry, NULL, perm, P9_OREAD); 567 if (IS_ERR(fid)) { 568 err = PTR_ERR(fid); 569 fid = NULL; 570 } 571 572 if (fid) 573 p9_client_clunk(fid); 574 575 return err; 576 } 577 578 /** 579 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 580 * @dir: inode that is being walked from 581 * @dentry: dentry that is being walked to? 582 * @nameidata: path data 583 * 584 */ 585 586 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 587 struct nameidata *nameidata) 588 { 589 struct super_block *sb; 590 struct v9fs_session_info *v9ses; 591 struct p9_fid *dfid, *fid; 592 struct inode *inode; 593 char *name; 594 int result = 0; 595 596 P9_DPRINTK(P9_DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 597 dir, dentry->d_name.name, dentry, nameidata); 598 599 sb = dir->i_sb; 600 v9ses = v9fs_inode2v9ses(dir); 601 dfid = v9fs_fid_lookup(dentry->d_parent); 602 if (IS_ERR(dfid)) 603 return ERR_CAST(dfid); 604 605 name = (char *) dentry->d_name.name; 606 fid = p9_client_walk(dfid, 1, &name, 1); 607 if (IS_ERR(fid)) { 608 result = PTR_ERR(fid); 609 if (result == -ENOENT) { 610 d_add(dentry, NULL); 611 return NULL; 612 } 613 614 return ERR_PTR(result); 615 } 616 617 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb); 618 if (IS_ERR(inode)) { 619 result = PTR_ERR(inode); 620 inode = NULL; 621 goto error; 622 } 623 624 result = v9fs_fid_add(dentry, fid); 625 if (result < 0) 626 goto error; 627 628 if ((fid->qid.version) && (v9ses->cache)) 629 dentry->d_op = &v9fs_cached_dentry_operations; 630 else 631 dentry->d_op = &v9fs_dentry_operations; 632 633 d_add(dentry, inode); 634 return NULL; 635 636 error: 637 p9_client_clunk(fid); 638 639 return ERR_PTR(result); 640 } 641 642 /** 643 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 644 * @i: inode that is being unlinked 645 * @d: dentry that is being unlinked 646 * 647 */ 648 649 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 650 { 651 return v9fs_remove(i, d, 0); 652 } 653 654 /** 655 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 656 * @i: inode that is being unlinked 657 * @d: dentry that is being unlinked 658 * 659 */ 660 661 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 662 { 663 return v9fs_remove(i, d, 1); 664 } 665 666 /** 667 * v9fs_vfs_rename - VFS hook to rename an inode 668 * @old_dir: old dir inode 669 * @old_dentry: old dentry 670 * @new_dir: new dir inode 671 * @new_dentry: new dentry 672 * 673 */ 674 675 static int 676 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 677 struct inode *new_dir, struct dentry *new_dentry) 678 { 679 struct inode *old_inode; 680 struct v9fs_session_info *v9ses; 681 struct p9_fid *oldfid; 682 struct p9_fid *olddirfid; 683 struct p9_fid *newdirfid; 684 struct p9_wstat wstat; 685 int retval; 686 687 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 688 retval = 0; 689 old_inode = old_dentry->d_inode; 690 v9ses = v9fs_inode2v9ses(old_inode); 691 oldfid = v9fs_fid_lookup(old_dentry); 692 if (IS_ERR(oldfid)) 693 return PTR_ERR(oldfid); 694 695 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 696 if (IS_ERR(olddirfid)) { 697 retval = PTR_ERR(olddirfid); 698 goto done; 699 } 700 701 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 702 if (IS_ERR(newdirfid)) { 703 retval = PTR_ERR(newdirfid); 704 goto clunk_olddir; 705 } 706 707 /* 9P can only handle file rename in the same directory */ 708 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 709 P9_DPRINTK(P9_DEBUG_ERROR, 710 "old dir and new dir are different\n"); 711 retval = -EXDEV; 712 goto clunk_newdir; 713 } 714 715 v9fs_blank_wstat(&wstat); 716 wstat.muid = v9ses->uname; 717 wstat.name = (char *) new_dentry->d_name.name; 718 retval = p9_client_wstat(oldfid, &wstat); 719 720 clunk_newdir: 721 p9_client_clunk(newdirfid); 722 723 clunk_olddir: 724 p9_client_clunk(olddirfid); 725 726 done: 727 return retval; 728 } 729 730 /** 731 * v9fs_vfs_getattr - retrieve file metadata 732 * @mnt: mount information 733 * @dentry: file to get attributes on 734 * @stat: metadata structure to populate 735 * 736 */ 737 738 static int 739 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 740 struct kstat *stat) 741 { 742 int err; 743 struct v9fs_session_info *v9ses; 744 struct p9_fid *fid; 745 struct p9_wstat *st; 746 747 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry); 748 err = -EPERM; 749 v9ses = v9fs_inode2v9ses(dentry->d_inode); 750 if (v9ses->cache == CACHE_LOOSE) 751 return simple_getattr(mnt, dentry, stat); 752 753 fid = v9fs_fid_lookup(dentry); 754 if (IS_ERR(fid)) 755 return PTR_ERR(fid); 756 757 st = p9_client_stat(fid); 758 if (IS_ERR(st)) 759 return PTR_ERR(st); 760 761 v9fs_stat2inode(st, dentry->d_inode, dentry->d_inode->i_sb); 762 generic_fillattr(dentry->d_inode, stat); 763 764 kfree(st); 765 return 0; 766 } 767 768 /** 769 * v9fs_vfs_setattr - set file metadata 770 * @dentry: file whose metadata to set 771 * @iattr: metadata assignment structure 772 * 773 */ 774 775 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 776 { 777 int retval; 778 struct v9fs_session_info *v9ses; 779 struct p9_fid *fid; 780 struct p9_wstat wstat; 781 782 P9_DPRINTK(P9_DEBUG_VFS, "\n"); 783 retval = -EPERM; 784 v9ses = v9fs_inode2v9ses(dentry->d_inode); 785 fid = v9fs_fid_lookup(dentry); 786 if(IS_ERR(fid)) 787 return PTR_ERR(fid); 788 789 v9fs_blank_wstat(&wstat); 790 if (iattr->ia_valid & ATTR_MODE) 791 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 792 793 if (iattr->ia_valid & ATTR_MTIME) 794 wstat.mtime = iattr->ia_mtime.tv_sec; 795 796 if (iattr->ia_valid & ATTR_ATIME) 797 wstat.atime = iattr->ia_atime.tv_sec; 798 799 if (iattr->ia_valid & ATTR_SIZE) 800 wstat.length = iattr->ia_size; 801 802 if (v9fs_extended(v9ses)) { 803 if (iattr->ia_valid & ATTR_UID) 804 wstat.n_uid = iattr->ia_uid; 805 806 if (iattr->ia_valid & ATTR_GID) 807 wstat.n_gid = iattr->ia_gid; 808 } 809 810 retval = p9_client_wstat(fid, &wstat); 811 if (retval >= 0) 812 retval = inode_setattr(dentry->d_inode, iattr); 813 814 return retval; 815 } 816 817 /** 818 * v9fs_stat2inode - populate an inode structure with mistat info 819 * @stat: Plan 9 metadata (mistat) structure 820 * @inode: inode to populate 821 * @sb: superblock of filesystem 822 * 823 */ 824 825 void 826 v9fs_stat2inode(struct p9_wstat *stat, struct inode *inode, 827 struct super_block *sb) 828 { 829 char ext[32]; 830 struct v9fs_session_info *v9ses = sb->s_fs_info; 831 832 inode->i_nlink = 1; 833 834 inode->i_atime.tv_sec = stat->atime; 835 inode->i_mtime.tv_sec = stat->mtime; 836 inode->i_ctime.tv_sec = stat->mtime; 837 838 inode->i_uid = v9ses->dfltuid; 839 inode->i_gid = v9ses->dfltgid; 840 841 if (v9fs_extended(v9ses)) { 842 inode->i_uid = stat->n_uid; 843 inode->i_gid = stat->n_gid; 844 } 845 846 inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 847 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 848 char type = 0; 849 int major = -1; 850 int minor = -1; 851 852 strncpy(ext, stat->extension, sizeof(ext)); 853 sscanf(ext, "%c %u %u", &type, &major, &minor); 854 switch (type) { 855 case 'c': 856 inode->i_mode &= ~S_IFBLK; 857 inode->i_mode |= S_IFCHR; 858 break; 859 case 'b': 860 break; 861 default: 862 P9_DPRINTK(P9_DEBUG_ERROR, 863 "Unknown special type %c %s\n", type, 864 stat->extension); 865 }; 866 inode->i_rdev = MKDEV(major, minor); 867 init_special_inode(inode, inode->i_mode, inode->i_rdev); 868 } else 869 inode->i_rdev = 0; 870 871 inode->i_size = stat->length; 872 873 /* not real number of blocks, but 512 byte ones ... */ 874 inode->i_blocks = (inode->i_size + 512 - 1) >> 9; 875 } 876 877 /** 878 * v9fs_qid2ino - convert qid into inode number 879 * @qid: qid to hash 880 * 881 * BUG: potential for inode number collisions? 882 */ 883 884 ino_t v9fs_qid2ino(struct p9_qid *qid) 885 { 886 u64 path = qid->path + 2; 887 ino_t i = 0; 888 889 if (sizeof(ino_t) == sizeof(path)) 890 memcpy(&i, &path, sizeof(ino_t)); 891 else 892 i = (ino_t) (path ^ (path >> 32)); 893 894 return i; 895 } 896 897 /** 898 * v9fs_readlink - read a symlink's location (internal version) 899 * @dentry: dentry for symlink 900 * @buffer: buffer to load symlink location into 901 * @buflen: length of buffer 902 * 903 */ 904 905 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 906 { 907 int retval; 908 909 struct v9fs_session_info *v9ses; 910 struct p9_fid *fid; 911 struct p9_wstat *st; 912 913 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name); 914 retval = -EPERM; 915 v9ses = v9fs_inode2v9ses(dentry->d_inode); 916 fid = v9fs_fid_lookup(dentry); 917 if (IS_ERR(fid)) 918 return PTR_ERR(fid); 919 920 if (!v9fs_extended(v9ses)) 921 return -EBADF; 922 923 st = p9_client_stat(fid); 924 if (IS_ERR(st)) 925 return PTR_ERR(st); 926 927 if (!(st->mode & P9_DMSYMLINK)) { 928 retval = -EINVAL; 929 goto done; 930 } 931 932 /* copy extension buffer into buffer */ 933 strncpy(buffer, st->extension, buflen); 934 935 P9_DPRINTK(P9_DEBUG_VFS, 936 "%s -> %s (%s)\n", dentry->d_name.name, st->extension, 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