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 37 #include "debug.h" 38 #include "v9fs.h" 39 #include "9p.h" 40 #include "v9fs_vfs.h" 41 #include "fid.h" 42 43 static const struct inode_operations v9fs_dir_inode_operations; 44 static const struct inode_operations v9fs_dir_inode_operations_ext; 45 static const struct inode_operations v9fs_file_inode_operations; 46 static const struct inode_operations v9fs_symlink_inode_operations; 47 48 /** 49 * unixmode2p9mode - convert unix mode bits to plan 9 50 * @v9ses: v9fs session information 51 * @mode: mode to convert 52 * 53 */ 54 55 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 56 { 57 int res; 58 res = mode & 0777; 59 if (S_ISDIR(mode)) 60 res |= V9FS_DMDIR; 61 if (v9ses->extended) { 62 if (S_ISLNK(mode)) 63 res |= V9FS_DMSYMLINK; 64 if (v9ses->nodev == 0) { 65 if (S_ISSOCK(mode)) 66 res |= V9FS_DMSOCKET; 67 if (S_ISFIFO(mode)) 68 res |= V9FS_DMNAMEDPIPE; 69 if (S_ISBLK(mode)) 70 res |= V9FS_DMDEVICE; 71 if (S_ISCHR(mode)) 72 res |= V9FS_DMDEVICE; 73 } 74 75 if ((mode & S_ISUID) == S_ISUID) 76 res |= V9FS_DMSETUID; 77 if ((mode & S_ISGID) == S_ISGID) 78 res |= V9FS_DMSETGID; 79 if ((mode & V9FS_DMLINK)) 80 res |= V9FS_DMLINK; 81 } 82 83 return res; 84 } 85 86 /** 87 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 88 * @v9ses: v9fs session information 89 * @mode: mode to convert 90 * 91 */ 92 93 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 94 { 95 int res; 96 97 res = mode & 0777; 98 99 if ((mode & V9FS_DMDIR) == V9FS_DMDIR) 100 res |= S_IFDIR; 101 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) 102 res |= S_IFLNK; 103 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) 104 && (v9ses->nodev == 0)) 105 res |= S_IFSOCK; 106 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) 107 && (v9ses->nodev == 0)) 108 res |= S_IFIFO; 109 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) 110 && (v9ses->nodev == 0)) 111 res |= S_IFBLK; 112 else 113 res |= S_IFREG; 114 115 if (v9ses->extended) { 116 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) 117 res |= S_ISUID; 118 119 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) 120 res |= S_ISGID; 121 } 122 123 return res; 124 } 125 126 int v9fs_uflags2omode(int uflags) 127 { 128 int ret; 129 130 ret = 0; 131 switch (uflags&3) { 132 default: 133 case O_RDONLY: 134 ret = V9FS_OREAD; 135 break; 136 137 case O_WRONLY: 138 ret = V9FS_OWRITE; 139 break; 140 141 case O_RDWR: 142 ret = V9FS_ORDWR; 143 break; 144 } 145 146 if (uflags & O_EXCL) 147 ret |= V9FS_OEXCL; 148 149 if (uflags & O_TRUNC) 150 ret |= V9FS_OTRUNC; 151 152 if (uflags & O_APPEND) 153 ret |= V9FS_OAPPEND; 154 155 return ret; 156 } 157 158 /** 159 * v9fs_blank_wstat - helper function to setup a 9P stat structure 160 * @v9ses: 9P session info (for determining extended mode) 161 * @wstat: structure to initialize 162 * 163 */ 164 165 static void 166 v9fs_blank_wstat(struct v9fs_wstat *wstat) 167 { 168 wstat->type = ~0; 169 wstat->dev = ~0; 170 wstat->qid.type = ~0; 171 wstat->qid.version = ~0; 172 *((long long *)&wstat->qid.path) = ~0; 173 wstat->mode = ~0; 174 wstat->atime = ~0; 175 wstat->mtime = ~0; 176 wstat->length = ~0; 177 wstat->name = NULL; 178 wstat->uid = NULL; 179 wstat->gid = NULL; 180 wstat->muid = NULL; 181 wstat->n_uid = ~0; 182 wstat->n_gid = ~0; 183 wstat->n_muid = ~0; 184 wstat->extension = NULL; 185 } 186 187 /** 188 * v9fs_get_inode - helper function to setup an inode 189 * @sb: superblock 190 * @mode: mode to setup inode with 191 * 192 */ 193 194 struct inode *v9fs_get_inode(struct super_block *sb, int mode) 195 { 196 struct inode *inode; 197 struct v9fs_session_info *v9ses = sb->s_fs_info; 198 199 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 200 201 inode = new_inode(sb); 202 if (inode) { 203 inode->i_mode = mode; 204 inode->i_uid = current->fsuid; 205 inode->i_gid = current->fsgid; 206 inode->i_blocks = 0; 207 inode->i_rdev = 0; 208 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 209 inode->i_mapping->a_ops = &v9fs_addr_operations; 210 211 switch (mode & S_IFMT) { 212 case S_IFIFO: 213 case S_IFBLK: 214 case S_IFCHR: 215 case S_IFSOCK: 216 if(!v9ses->extended) { 217 dprintk(DEBUG_ERROR, "special files without extended mode\n"); 218 return ERR_PTR(-EINVAL); 219 } 220 init_special_inode(inode, inode->i_mode, 221 inode->i_rdev); 222 break; 223 case S_IFREG: 224 inode->i_op = &v9fs_file_inode_operations; 225 inode->i_fop = &v9fs_file_operations; 226 break; 227 case S_IFLNK: 228 if(!v9ses->extended) { 229 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); 230 return ERR_PTR(-EINVAL); 231 } 232 inode->i_op = &v9fs_symlink_inode_operations; 233 break; 234 case S_IFDIR: 235 inc_nlink(inode); 236 if(v9ses->extended) 237 inode->i_op = &v9fs_dir_inode_operations_ext; 238 else 239 inode->i_op = &v9fs_dir_inode_operations; 240 inode->i_fop = &v9fs_dir_operations; 241 break; 242 default: 243 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 244 mode, mode & S_IFMT); 245 return ERR_PTR(-EINVAL); 246 } 247 } else { 248 eprintk(KERN_WARNING, "Problem allocating inode\n"); 249 return ERR_PTR(-ENOMEM); 250 } 251 return inode; 252 } 253 254 static int 255 v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm, 256 u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit) 257 { 258 int fid; 259 int err; 260 struct v9fs_fcall *fcall; 261 262 fid = v9fs_get_idpool(&v9ses->fidpool); 263 if (fid < 0) { 264 eprintk(KERN_WARNING, "no free fids available\n"); 265 return -ENOSPC; 266 } 267 268 err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall); 269 if (err < 0) { 270 PRINT_FCALL_ERROR("clone error", fcall); 271 if (fcall && fcall->id == RWALK) 272 goto clunk_fid; 273 else 274 goto put_fid; 275 } 276 kfree(fcall); 277 278 err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall); 279 if (err < 0) { 280 PRINT_FCALL_ERROR("create fails", fcall); 281 goto clunk_fid; 282 } 283 284 if (iounit) 285 *iounit = fcall->params.rcreate.iounit; 286 287 if (qid) 288 *qid = fcall->params.rcreate.qid; 289 290 if (fidp) 291 *fidp = fid; 292 293 kfree(fcall); 294 return 0; 295 296 clunk_fid: 297 v9fs_t_clunk(v9ses, fid); 298 fid = V9FS_NOFID; 299 300 put_fid: 301 if (fid != V9FS_NOFID) 302 v9fs_put_idpool(fid, &v9ses->fidpool); 303 304 kfree(fcall); 305 return err; 306 } 307 308 static struct v9fs_fid* 309 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 310 { 311 int err; 312 int nfid; 313 struct v9fs_fid *ret; 314 struct v9fs_fcall *fcall; 315 316 nfid = v9fs_get_idpool(&v9ses->fidpool); 317 if (nfid < 0) { 318 eprintk(KERN_WARNING, "no free fids available\n"); 319 return ERR_PTR(-ENOSPC); 320 } 321 322 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 323 &fcall); 324 325 if (err < 0) { 326 if (fcall && fcall->id == RWALK) 327 goto clunk_fid; 328 329 PRINT_FCALL_ERROR("walk error", fcall); 330 v9fs_put_idpool(nfid, &v9ses->fidpool); 331 goto error; 332 } 333 334 kfree(fcall); 335 fcall = NULL; 336 ret = v9fs_fid_create(v9ses, nfid); 337 if (!ret) { 338 err = -ENOMEM; 339 goto clunk_fid; 340 } 341 342 err = v9fs_fid_insert(ret, dentry); 343 if (err < 0) { 344 v9fs_fid_destroy(ret); 345 goto clunk_fid; 346 } 347 348 return ret; 349 350 clunk_fid: 351 v9fs_t_clunk(v9ses, nfid); 352 353 error: 354 kfree(fcall); 355 return ERR_PTR(err); 356 } 357 358 static struct inode * 359 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, 360 struct super_block *sb) 361 { 362 int err, umode; 363 struct inode *ret; 364 struct v9fs_fcall *fcall; 365 366 ret = NULL; 367 err = v9fs_t_stat(v9ses, fid, &fcall); 368 if (err) { 369 PRINT_FCALL_ERROR("stat error", fcall); 370 goto error; 371 } 372 373 umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); 374 ret = v9fs_get_inode(sb, umode); 375 if (IS_ERR(ret)) { 376 err = PTR_ERR(ret); 377 ret = NULL; 378 goto error; 379 } 380 381 v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); 382 kfree(fcall); 383 return ret; 384 385 error: 386 kfree(fcall); 387 if (ret) 388 iput(ret); 389 390 return ERR_PTR(err); 391 } 392 393 /** 394 * v9fs_remove - helper function to remove files and directories 395 * @dir: directory inode that is being deleted 396 * @file: dentry that is being deleted 397 * @rmdir: removing a directory 398 * 399 */ 400 401 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 402 { 403 struct v9fs_fcall *fcall = NULL; 404 struct super_block *sb = NULL; 405 struct v9fs_session_info *v9ses = NULL; 406 struct v9fs_fid *v9fid = NULL; 407 struct inode *file_inode = NULL; 408 int fid = -1; 409 int result = 0; 410 411 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 412 rmdir); 413 414 file_inode = file->d_inode; 415 sb = file_inode->i_sb; 416 v9ses = v9fs_inode2v9ses(file_inode); 417 v9fid = v9fs_fid_clone(file); 418 if(IS_ERR(v9fid)) 419 return PTR_ERR(v9fid); 420 421 fid = v9fid->fid; 422 if (fid < 0) { 423 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", 424 file_inode->i_ino); 425 return -EBADF; 426 } 427 428 result = v9fs_t_remove(v9ses, fid, &fcall); 429 if (result < 0) { 430 PRINT_FCALL_ERROR("remove fails", fcall); 431 goto Error; 432 } 433 434 v9fs_put_idpool(fid, &v9ses->fidpool); 435 v9fs_fid_destroy(v9fid); 436 437 Error: 438 kfree(fcall); 439 return result; 440 } 441 442 static int 443 v9fs_open_created(struct inode *inode, struct file *file) 444 { 445 return 0; 446 } 447 448 /** 449 * v9fs_vfs_create - VFS hook to create files 450 * @inode: directory inode that is being deleted 451 * @dentry: dentry that is being deleted 452 * @mode: create permissions 453 * @nd: path information 454 * 455 */ 456 457 static int 458 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 459 struct nameidata *nd) 460 { 461 int err; 462 u32 fid, perm, iounit; 463 int flags; 464 struct v9fs_session_info *v9ses; 465 struct v9fs_fid *dfid, *vfid, *ffid; 466 struct inode *inode; 467 struct v9fs_qid qid; 468 struct file *filp; 469 470 inode = NULL; 471 vfid = NULL; 472 v9ses = v9fs_inode2v9ses(dir); 473 dfid = v9fs_fid_clone(dentry->d_parent); 474 if(IS_ERR(dfid)) { 475 err = PTR_ERR(dfid); 476 goto error; 477 } 478 479 perm = unixmode2p9mode(v9ses, mode); 480 if (nd && nd->flags & LOOKUP_OPEN) 481 flags = nd->intent.open.flags - 1; 482 else 483 flags = O_RDWR; 484 485 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 486 perm, v9fs_uflags2omode(flags), NULL, &fid, &qid, &iounit); 487 488 if (err) 489 goto clunk_dfid; 490 491 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 492 v9fs_fid_clunk(v9ses, dfid); 493 if (IS_ERR(vfid)) { 494 err = PTR_ERR(vfid); 495 vfid = NULL; 496 goto error; 497 } 498 499 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 500 if (IS_ERR(inode)) { 501 err = PTR_ERR(inode); 502 inode = NULL; 503 goto error; 504 } 505 506 if(v9ses->cache) 507 dentry->d_op = &v9fs_cached_dentry_operations; 508 else 509 dentry->d_op = &v9fs_dentry_operations; 510 d_instantiate(dentry, inode); 511 512 if (nd && nd->flags & LOOKUP_OPEN) { 513 ffid = v9fs_fid_create(v9ses, fid); 514 if (!ffid) 515 return -ENOMEM; 516 517 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 518 if (IS_ERR(filp)) { 519 v9fs_fid_destroy(ffid); 520 return PTR_ERR(filp); 521 } 522 523 ffid->rdir_pos = 0; 524 ffid->rdir_fcall = NULL; 525 ffid->fidopen = 1; 526 ffid->iounit = iounit; 527 ffid->filp = filp; 528 filp->private_data = ffid; 529 } 530 531 return 0; 532 533 clunk_dfid: 534 v9fs_fid_clunk(v9ses, dfid); 535 536 error: 537 if (vfid) 538 v9fs_fid_destroy(vfid); 539 540 return err; 541 } 542 543 /** 544 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 545 * @inode: inode that is being unlinked 546 * @dentry: dentry that is being unlinked 547 * @mode: mode for new directory 548 * 549 */ 550 551 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 552 { 553 int err; 554 u32 fid, perm; 555 struct v9fs_session_info *v9ses; 556 struct v9fs_fid *dfid, *vfid; 557 struct inode *inode; 558 559 inode = NULL; 560 vfid = NULL; 561 v9ses = v9fs_inode2v9ses(dir); 562 dfid = v9fs_fid_clone(dentry->d_parent); 563 if(IS_ERR(dfid)) { 564 err = PTR_ERR(dfid); 565 goto error; 566 } 567 568 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 569 570 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 571 perm, V9FS_OREAD, NULL, &fid, NULL, NULL); 572 573 if (err) { 574 dprintk(DEBUG_ERROR, "create error %d\n", err); 575 goto clean_up_dfid; 576 } 577 578 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 579 if (IS_ERR(vfid)) { 580 err = PTR_ERR(vfid); 581 vfid = NULL; 582 goto clean_up_dfid; 583 } 584 585 v9fs_fid_clunk(v9ses, dfid); 586 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 587 if (IS_ERR(inode)) { 588 err = PTR_ERR(inode); 589 inode = NULL; 590 v9fs_fid_destroy(vfid); 591 goto error; 592 } 593 594 if(v9ses->cache) 595 dentry->d_op = &v9fs_cached_dentry_operations; 596 else 597 dentry->d_op = &v9fs_dentry_operations; 598 d_instantiate(dentry, inode); 599 return 0; 600 601 clean_up_dfid: 602 v9fs_fid_clunk(v9ses, dfid); 603 604 error: 605 return err; 606 } 607 608 /** 609 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 610 * @dir: inode that is being walked from 611 * @dentry: dentry that is being walked to? 612 * @nameidata: path data 613 * 614 */ 615 616 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 617 struct nameidata *nameidata) 618 { 619 struct super_block *sb; 620 struct v9fs_session_info *v9ses; 621 struct v9fs_fid *dirfid; 622 struct v9fs_fid *fid; 623 struct inode *inode; 624 struct v9fs_fcall *fcall = NULL; 625 int dirfidnum = -1; 626 int newfid = -1; 627 int result = 0; 628 629 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 630 dir, dentry->d_name.name, dentry, nameidata); 631 632 sb = dir->i_sb; 633 v9ses = v9fs_inode2v9ses(dir); 634 dirfid = v9fs_fid_lookup(dentry->d_parent); 635 636 if(IS_ERR(dirfid)) 637 return ERR_PTR(PTR_ERR(dirfid)); 638 639 dirfidnum = dirfid->fid; 640 641 newfid = v9fs_get_idpool(&v9ses->fidpool); 642 if (newfid < 0) { 643 eprintk(KERN_WARNING, "newfid fails!\n"); 644 result = -ENOSPC; 645 goto Release_Dirfid; 646 } 647 648 result = v9fs_t_walk(v9ses, dirfidnum, newfid, 649 (char *)dentry->d_name.name, &fcall); 650 651 up(&dirfid->lock); 652 653 if (result < 0) { 654 if (fcall && fcall->id == RWALK) 655 v9fs_t_clunk(v9ses, newfid); 656 else 657 v9fs_put_idpool(newfid, &v9ses->fidpool); 658 659 if (result == -ENOENT) { 660 d_add(dentry, NULL); 661 dprintk(DEBUG_VFS, 662 "Return negative dentry %p count %d\n", 663 dentry, atomic_read(&dentry->d_count)); 664 kfree(fcall); 665 return NULL; 666 } 667 dprintk(DEBUG_ERROR, "walk error:%d\n", result); 668 goto FreeFcall; 669 } 670 kfree(fcall); 671 672 result = v9fs_t_stat(v9ses, newfid, &fcall); 673 if (result < 0) { 674 dprintk(DEBUG_ERROR, "stat error\n"); 675 goto FreeFcall; 676 } 677 678 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, 679 fcall->params.rstat.stat.mode)); 680 681 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { 682 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", 683 PTR_ERR(inode)); 684 685 result = -ENOSPC; 686 goto FreeFcall; 687 } 688 689 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); 690 691 fid = v9fs_fid_create(v9ses, newfid); 692 if (fid == NULL) { 693 dprintk(DEBUG_ERROR, "couldn't insert\n"); 694 result = -ENOMEM; 695 goto FreeFcall; 696 } 697 698 result = v9fs_fid_insert(fid, dentry); 699 if (result < 0) 700 goto FreeFcall; 701 702 fid->qid = fcall->params.rstat.stat.qid; 703 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); 704 if((fid->qid.version)&&(v9ses->cache)) 705 dentry->d_op = &v9fs_cached_dentry_operations; 706 else 707 dentry->d_op = &v9fs_dentry_operations; 708 709 d_add(dentry, inode); 710 kfree(fcall); 711 712 return NULL; 713 714 Release_Dirfid: 715 up(&dirfid->lock); 716 717 FreeFcall: 718 kfree(fcall); 719 720 return ERR_PTR(result); 721 } 722 723 /** 724 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 725 * @i: inode that is being unlinked 726 * @d: dentry that is being unlinked 727 * 728 */ 729 730 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 731 { 732 return v9fs_remove(i, d, 0); 733 } 734 735 /** 736 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 737 * @i: inode that is being unlinked 738 * @d: dentry that is being unlinked 739 * 740 */ 741 742 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 743 { 744 return v9fs_remove(i, d, 1); 745 } 746 747 /** 748 * v9fs_vfs_rename - VFS hook to rename an inode 749 * @old_dir: old dir inode 750 * @old_dentry: old dentry 751 * @new_dir: new dir inode 752 * @new_dentry: new dentry 753 * 754 */ 755 756 static int 757 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 758 struct inode *new_dir, struct dentry *new_dentry) 759 { 760 struct inode *old_inode = old_dentry->d_inode; 761 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); 762 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); 763 struct v9fs_fid *olddirfid; 764 struct v9fs_fid *newdirfid; 765 struct v9fs_wstat wstat; 766 struct v9fs_fcall *fcall = NULL; 767 int fid = -1; 768 int olddirfidnum = -1; 769 int newdirfidnum = -1; 770 int retval = 0; 771 772 dprintk(DEBUG_VFS, "\n"); 773 774 if(IS_ERR(oldfid)) 775 return PTR_ERR(oldfid); 776 777 olddirfid = v9fs_fid_clone(old_dentry->d_parent); 778 if(IS_ERR(olddirfid)) { 779 retval = PTR_ERR(olddirfid); 780 goto Release_lock; 781 } 782 783 newdirfid = v9fs_fid_clone(new_dentry->d_parent); 784 if(IS_ERR(newdirfid)) { 785 retval = PTR_ERR(newdirfid); 786 goto Clunk_olddir; 787 } 788 789 /* 9P can only handle file rename in the same directory */ 790 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 791 dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); 792 retval = -EXDEV; 793 goto Clunk_newdir; 794 } 795 796 fid = oldfid->fid; 797 olddirfidnum = olddirfid->fid; 798 newdirfidnum = newdirfid->fid; 799 800 if (fid < 0) { 801 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", 802 old_inode->i_ino); 803 retval = -EBADF; 804 goto Clunk_newdir; 805 } 806 807 v9fs_blank_wstat(&wstat); 808 wstat.muid = v9ses->name; 809 wstat.name = (char *) new_dentry->d_name.name; 810 811 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); 812 813 if (retval < 0) 814 PRINT_FCALL_ERROR("wstat error", fcall); 815 816 kfree(fcall); 817 818 Clunk_newdir: 819 v9fs_fid_clunk(v9ses, newdirfid); 820 821 Clunk_olddir: 822 v9fs_fid_clunk(v9ses, olddirfid); 823 824 Release_lock: 825 up(&oldfid->lock); 826 827 return retval; 828 } 829 830 /** 831 * v9fs_vfs_getattr - retrieve file metadata 832 * @mnt - mount information 833 * @dentry - file to get attributes on 834 * @stat - metadata structure to populate 835 * 836 */ 837 838 static int 839 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 840 struct kstat *stat) 841 { 842 struct v9fs_fcall *fcall = NULL; 843 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 844 struct v9fs_fid *fid = v9fs_fid_clone(dentry); 845 int err = -EPERM; 846 847 dprintk(DEBUG_VFS, "dentry: %p\n", dentry); 848 if(IS_ERR(fid)) 849 return PTR_ERR(fid); 850 851 err = v9fs_t_stat(v9ses, fid->fid, &fcall); 852 853 if (err < 0) 854 dprintk(DEBUG_ERROR, "stat error\n"); 855 else { 856 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, 857 dentry->d_inode->i_sb); 858 generic_fillattr(dentry->d_inode, stat); 859 } 860 861 kfree(fcall); 862 v9fs_fid_clunk(v9ses, fid); 863 return err; 864 } 865 866 /** 867 * v9fs_vfs_setattr - set file metadata 868 * @dentry: file whose metadata to set 869 * @iattr: metadata assignment structure 870 * 871 */ 872 873 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 874 { 875 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 876 struct v9fs_fid *fid = v9fs_fid_clone(dentry); 877 struct v9fs_fcall *fcall = NULL; 878 struct v9fs_wstat wstat; 879 int res = -EPERM; 880 881 dprintk(DEBUG_VFS, "\n"); 882 if(IS_ERR(fid)) 883 return PTR_ERR(fid); 884 885 v9fs_blank_wstat(&wstat); 886 if (iattr->ia_valid & ATTR_MODE) 887 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 888 889 if (iattr->ia_valid & ATTR_MTIME) 890 wstat.mtime = iattr->ia_mtime.tv_sec; 891 892 if (iattr->ia_valid & ATTR_ATIME) 893 wstat.atime = iattr->ia_atime.tv_sec; 894 895 if (iattr->ia_valid & ATTR_SIZE) 896 wstat.length = iattr->ia_size; 897 898 if (v9ses->extended) { 899 if (iattr->ia_valid & ATTR_UID) 900 wstat.n_uid = iattr->ia_uid; 901 902 if (iattr->ia_valid & ATTR_GID) 903 wstat.n_gid = iattr->ia_gid; 904 } 905 906 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); 907 908 if (res < 0) 909 PRINT_FCALL_ERROR("wstat error", fcall); 910 911 kfree(fcall); 912 if (res >= 0) 913 res = inode_setattr(dentry->d_inode, iattr); 914 915 v9fs_fid_clunk(v9ses, fid); 916 return res; 917 } 918 919 /** 920 * v9fs_stat2inode - populate an inode structure with mistat info 921 * @stat: Plan 9 metadata (mistat) structure 922 * @inode: inode to populate 923 * @sb: superblock of filesystem 924 * 925 */ 926 927 void 928 v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, 929 struct super_block *sb) 930 { 931 int n; 932 char ext[32]; 933 struct v9fs_session_info *v9ses = sb->s_fs_info; 934 935 inode->i_nlink = 1; 936 937 inode->i_atime.tv_sec = stat->atime; 938 inode->i_mtime.tv_sec = stat->mtime; 939 inode->i_ctime.tv_sec = stat->mtime; 940 941 inode->i_uid = v9ses->uid; 942 inode->i_gid = v9ses->gid; 943 944 if (v9ses->extended) { 945 inode->i_uid = stat->n_uid; 946 inode->i_gid = stat->n_gid; 947 } 948 949 inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 950 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 951 char type = 0; 952 int major = -1; 953 int minor = -1; 954 955 n = stat->extension.len; 956 if (n > sizeof(ext)-1) 957 n = sizeof(ext)-1; 958 memmove(ext, stat->extension.str, n); 959 ext[n] = 0; 960 sscanf(ext, "%c %u %u", &type, &major, &minor); 961 switch (type) { 962 case 'c': 963 inode->i_mode &= ~S_IFBLK; 964 inode->i_mode |= S_IFCHR; 965 break; 966 case 'b': 967 break; 968 default: 969 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", 970 type, stat->extension.len, stat->extension.str); 971 }; 972 inode->i_rdev = MKDEV(major, minor); 973 } else 974 inode->i_rdev = 0; 975 976 inode->i_size = stat->length; 977 978 inode->i_blocks = 979 (inode->i_size + sb->s_blocksize - 1) >> sb->s_blocksize_bits; 980 } 981 982 /** 983 * v9fs_qid2ino - convert qid into inode number 984 * @qid: qid to hash 985 * 986 * BUG: potential for inode number collisions? 987 */ 988 989 ino_t v9fs_qid2ino(struct v9fs_qid *qid) 990 { 991 u64 path = qid->path + 2; 992 ino_t i = 0; 993 994 if (sizeof(ino_t) == sizeof(path)) 995 memcpy(&i, &path, sizeof(ino_t)); 996 else 997 i = (ino_t) (path ^ (path >> 32)); 998 999 return i; 1000 } 1001 1002 /** 1003 * v9fs_readlink - read a symlink's location (internal version) 1004 * @dentry: dentry for symlink 1005 * @buffer: buffer to load symlink location into 1006 * @buflen: length of buffer 1007 * 1008 */ 1009 1010 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 1011 { 1012 int retval = -EPERM; 1013 1014 struct v9fs_fcall *fcall = NULL; 1015 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 1016 struct v9fs_fid *fid = v9fs_fid_clone(dentry); 1017 1018 if(IS_ERR(fid)) 1019 return PTR_ERR(fid); 1020 1021 if (!v9ses->extended) { 1022 retval = -EBADF; 1023 dprintk(DEBUG_ERROR, "not extended\n"); 1024 goto ClunkFid; 1025 } 1026 1027 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); 1028 retval = v9fs_t_stat(v9ses, fid->fid, &fcall); 1029 1030 if (retval < 0) { 1031 dprintk(DEBUG_ERROR, "stat error\n"); 1032 goto FreeFcall; 1033 } 1034 1035 if (!fcall) { 1036 retval = -EIO; 1037 goto ClunkFid; 1038 } 1039 1040 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { 1041 retval = -EINVAL; 1042 goto FreeFcall; 1043 } 1044 1045 /* copy extension buffer into buffer */ 1046 if (fcall->params.rstat.stat.extension.len < buflen) 1047 buflen = fcall->params.rstat.stat.extension.len + 1; 1048 1049 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); 1050 buffer[buflen-1] = 0; 1051 1052 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len, 1053 fcall->params.rstat.stat.extension.str, buffer); 1054 retval = buflen; 1055 1056 FreeFcall: 1057 kfree(fcall); 1058 1059 ClunkFid: 1060 v9fs_fid_clunk(v9ses, fid); 1061 1062 return retval; 1063 } 1064 1065 /** 1066 * v9fs_vfs_readlink - read a symlink's location 1067 * @dentry: dentry for symlink 1068 * @buf: buffer to load symlink location into 1069 * @buflen: length of buffer 1070 * 1071 */ 1072 1073 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 1074 int buflen) 1075 { 1076 int retval; 1077 int ret; 1078 char *link = __getname(); 1079 1080 if (unlikely(!link)) 1081 return -ENOMEM; 1082 1083 if (buflen > PATH_MAX) 1084 buflen = PATH_MAX; 1085 1086 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 1087 1088 retval = v9fs_readlink(dentry, link, buflen); 1089 1090 if (retval > 0) { 1091 if ((ret = copy_to_user(buffer, link, retval)) != 0) { 1092 dprintk(DEBUG_ERROR, "problem copying to user: %d\n", 1093 ret); 1094 retval = ret; 1095 } 1096 } 1097 1098 __putname(link); 1099 return retval; 1100 } 1101 1102 /** 1103 * v9fs_vfs_follow_link - follow a symlink path 1104 * @dentry: dentry for symlink 1105 * @nd: nameidata 1106 * 1107 */ 1108 1109 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1110 { 1111 int len = 0; 1112 char *link = __getname(); 1113 1114 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); 1115 1116 if (!link) 1117 link = ERR_PTR(-ENOMEM); 1118 else { 1119 len = v9fs_readlink(dentry, link, PATH_MAX); 1120 1121 if (len < 0) { 1122 __putname(link); 1123 link = ERR_PTR(len); 1124 } else 1125 link[len] = 0; 1126 } 1127 nd_set_link(nd, link); 1128 1129 return NULL; 1130 } 1131 1132 /** 1133 * v9fs_vfs_put_link - release a symlink path 1134 * @dentry: dentry for symlink 1135 * @nd: nameidata 1136 * 1137 */ 1138 1139 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1140 { 1141 char *s = nd_get_link(nd); 1142 1143 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 1144 if (!IS_ERR(s)) 1145 __putname(s); 1146 } 1147 1148 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1149 int mode, const char *extension) 1150 { 1151 int err; 1152 u32 fid, perm; 1153 struct v9fs_session_info *v9ses; 1154 struct v9fs_fid *dfid, *vfid = NULL; 1155 struct inode *inode = NULL; 1156 1157 v9ses = v9fs_inode2v9ses(dir); 1158 if (!v9ses->extended) { 1159 dprintk(DEBUG_ERROR, "not extended\n"); 1160 return -EPERM; 1161 } 1162 1163 dfid = v9fs_fid_clone(dentry->d_parent); 1164 if(IS_ERR(dfid)) { 1165 err = PTR_ERR(dfid); 1166 goto error; 1167 } 1168 1169 perm = unixmode2p9mode(v9ses, mode); 1170 1171 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 1172 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL); 1173 1174 if (err) 1175 goto clunk_dfid; 1176 1177 err = v9fs_t_clunk(v9ses, fid); 1178 if (err) 1179 goto clunk_dfid; 1180 1181 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 1182 if (IS_ERR(vfid)) { 1183 err = PTR_ERR(vfid); 1184 vfid = NULL; 1185 goto clunk_dfid; 1186 } 1187 1188 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 1189 if (IS_ERR(inode)) { 1190 err = PTR_ERR(inode); 1191 inode = NULL; 1192 goto free_vfid; 1193 } 1194 1195 if(v9ses->cache) 1196 dentry->d_op = &v9fs_cached_dentry_operations; 1197 else 1198 dentry->d_op = &v9fs_dentry_operations; 1199 d_instantiate(dentry, inode); 1200 return 0; 1201 1202 free_vfid: 1203 v9fs_fid_destroy(vfid); 1204 1205 clunk_dfid: 1206 v9fs_fid_clunk(v9ses, dfid); 1207 1208 error: 1209 return err; 1210 1211 } 1212 1213 /** 1214 * v9fs_vfs_symlink - helper function to create symlinks 1215 * @dir: directory inode containing symlink 1216 * @dentry: dentry for symlink 1217 * @symname: symlink data 1218 * 1219 * See 9P2000.u RFC for more information 1220 * 1221 */ 1222 1223 static int 1224 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1225 { 1226 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1227 symname); 1228 1229 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1230 } 1231 1232 /** 1233 * v9fs_vfs_link - create a hardlink 1234 * @old_dentry: dentry for file to link to 1235 * @dir: inode destination for new link 1236 * @dentry: dentry for link 1237 * 1238 */ 1239 1240 /* XXX - lots of code dup'd from symlink and creates, 1241 * figure out a better reuse strategy 1242 */ 1243 1244 static int 1245 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1246 struct dentry *dentry) 1247 { 1248 int retval; 1249 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 1250 struct v9fs_fid *oldfid; 1251 char *name; 1252 1253 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1254 old_dentry->d_name.name); 1255 1256 oldfid = v9fs_fid_clone(old_dentry); 1257 if(IS_ERR(oldfid)) 1258 return PTR_ERR(oldfid); 1259 1260 name = __getname(); 1261 if (unlikely(!name)) { 1262 retval = -ENOMEM; 1263 goto clunk_fid; 1264 } 1265 1266 sprintf(name, "%d\n", oldfid->fid); 1267 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); 1268 __putname(name); 1269 1270 clunk_fid: 1271 v9fs_fid_clunk(v9ses, oldfid); 1272 return retval; 1273 } 1274 1275 /** 1276 * v9fs_vfs_mknod - create a special file 1277 * @dir: inode destination for new link 1278 * @dentry: dentry for file 1279 * @mode: mode for creation 1280 * @dev_t: device associated with special file 1281 * 1282 */ 1283 1284 static int 1285 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1286 { 1287 int retval; 1288 char *name; 1289 1290 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1291 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1292 1293 if (!new_valid_dev(rdev)) 1294 return -EINVAL; 1295 1296 name = __getname(); 1297 if (!name) 1298 return -ENOMEM; 1299 /* build extension */ 1300 if (S_ISBLK(mode)) 1301 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1302 else if (S_ISCHR(mode)) 1303 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1304 else if (S_ISFIFO(mode)) 1305 *name = 0; 1306 else { 1307 __putname(name); 1308 return -EINVAL; 1309 } 1310 1311 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1312 __putname(name); 1313 1314 return retval; 1315 } 1316 1317 static const struct inode_operations v9fs_dir_inode_operations_ext = { 1318 .create = v9fs_vfs_create, 1319 .lookup = v9fs_vfs_lookup, 1320 .symlink = v9fs_vfs_symlink, 1321 .link = v9fs_vfs_link, 1322 .unlink = v9fs_vfs_unlink, 1323 .mkdir = v9fs_vfs_mkdir, 1324 .rmdir = v9fs_vfs_rmdir, 1325 .mknod = v9fs_vfs_mknod, 1326 .rename = v9fs_vfs_rename, 1327 .readlink = v9fs_vfs_readlink, 1328 .getattr = v9fs_vfs_getattr, 1329 .setattr = v9fs_vfs_setattr, 1330 }; 1331 1332 static const struct inode_operations v9fs_dir_inode_operations = { 1333 .create = v9fs_vfs_create, 1334 .lookup = v9fs_vfs_lookup, 1335 .unlink = v9fs_vfs_unlink, 1336 .mkdir = v9fs_vfs_mkdir, 1337 .rmdir = v9fs_vfs_rmdir, 1338 .mknod = v9fs_vfs_mknod, 1339 .rename = v9fs_vfs_rename, 1340 .getattr = v9fs_vfs_getattr, 1341 .setattr = v9fs_vfs_setattr, 1342 }; 1343 1344 static const struct inode_operations v9fs_file_inode_operations = { 1345 .getattr = v9fs_vfs_getattr, 1346 .setattr = v9fs_vfs_setattr, 1347 }; 1348 1349 static const struct inode_operations v9fs_symlink_inode_operations = { 1350 .readlink = v9fs_vfs_readlink, 1351 .follow_link = v9fs_vfs_follow_link, 1352 .put_link = v9fs_vfs_put_link, 1353 .getattr = v9fs_vfs_getattr, 1354 .setattr = v9fs_vfs_setattr, 1355 }; 1356