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/smp_lock.h> 34 #include <linux/inet.h> 35 #include <linux/namei.h> 36 #include <linux/idr.h> 37 38 #include "debug.h" 39 #include "v9fs.h" 40 #include "9p.h" 41 #include "v9fs_vfs.h" 42 #include "fid.h" 43 44 static struct inode_operations v9fs_dir_inode_operations; 45 static struct inode_operations v9fs_dir_inode_operations_ext; 46 static struct inode_operations v9fs_file_inode_operations; 47 static 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 |= V9FS_DMDIR; 62 if (v9ses->extended) { 63 if (S_ISLNK(mode)) 64 res |= V9FS_DMSYMLINK; 65 if (v9ses->nodev == 0) { 66 if (S_ISSOCK(mode)) 67 res |= V9FS_DMSOCKET; 68 if (S_ISFIFO(mode)) 69 res |= V9FS_DMNAMEDPIPE; 70 if (S_ISBLK(mode)) 71 res |= V9FS_DMDEVICE; 72 if (S_ISCHR(mode)) 73 res |= V9FS_DMDEVICE; 74 } 75 76 if ((mode & S_ISUID) == S_ISUID) 77 res |= V9FS_DMSETUID; 78 if ((mode & S_ISGID) == S_ISGID) 79 res |= V9FS_DMSETGID; 80 if ((mode & V9FS_DMLINK)) 81 res |= V9FS_DMLINK; 82 } 83 84 return res; 85 } 86 87 /** 88 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 89 * @v9ses: v9fs session information 90 * @mode: mode to convert 91 * 92 */ 93 94 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 95 { 96 int res; 97 98 res = mode & 0777; 99 100 if ((mode & V9FS_DMDIR) == V9FS_DMDIR) 101 res |= S_IFDIR; 102 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) 103 res |= S_IFLNK; 104 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) 105 && (v9ses->nodev == 0)) 106 res |= S_IFSOCK; 107 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) 108 && (v9ses->nodev == 0)) 109 res |= S_IFIFO; 110 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) 111 && (v9ses->nodev == 0)) 112 res |= S_IFBLK; 113 else 114 res |= S_IFREG; 115 116 if (v9ses->extended) { 117 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) 118 res |= S_ISUID; 119 120 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) 121 res |= S_ISGID; 122 } 123 124 return res; 125 } 126 127 int v9fs_uflags2omode(int uflags) 128 { 129 int ret; 130 131 ret = 0; 132 switch (uflags&3) { 133 default: 134 case O_RDONLY: 135 ret = V9FS_OREAD; 136 break; 137 138 case O_WRONLY: 139 ret = V9FS_OWRITE; 140 break; 141 142 case O_RDWR: 143 ret = V9FS_ORDWR; 144 break; 145 } 146 147 if (uflags & O_EXCL) 148 ret |= V9FS_OEXCL; 149 150 if (uflags & O_TRUNC) 151 ret |= V9FS_OTRUNC; 152 153 if (uflags & O_APPEND) 154 ret |= V9FS_OAPPEND; 155 156 return ret; 157 } 158 159 /** 160 * v9fs_blank_wstat - helper function to setup a 9P stat structure 161 * @v9ses: 9P session info (for determining extended mode) 162 * @wstat: structure to initialize 163 * 164 */ 165 166 static void 167 v9fs_blank_wstat(struct v9fs_wstat *wstat) 168 { 169 wstat->type = ~0; 170 wstat->dev = ~0; 171 wstat->qid.type = ~0; 172 wstat->qid.version = ~0; 173 *((long long *)&wstat->qid.path) = ~0; 174 wstat->mode = ~0; 175 wstat->atime = ~0; 176 wstat->mtime = ~0; 177 wstat->length = ~0; 178 wstat->name = NULL; 179 wstat->uid = NULL; 180 wstat->gid = NULL; 181 wstat->muid = NULL; 182 wstat->n_uid = ~0; 183 wstat->n_gid = ~0; 184 wstat->n_muid = ~0; 185 wstat->extension = NULL; 186 } 187 188 /** 189 * v9fs_get_inode - helper function to setup an inode 190 * @sb: superblock 191 * @mode: mode to setup inode with 192 * 193 */ 194 195 struct inode *v9fs_get_inode(struct super_block *sb, int mode) 196 { 197 struct inode *inode; 198 struct v9fs_session_info *v9ses = sb->s_fs_info; 199 200 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 201 202 inode = new_inode(sb); 203 if (inode) { 204 inode->i_mode = mode; 205 inode->i_uid = current->fsuid; 206 inode->i_gid = current->fsgid; 207 inode->i_blksize = sb->s_blocksize; 208 inode->i_blocks = 0; 209 inode->i_rdev = 0; 210 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 211 inode->i_mapping->a_ops = &v9fs_addr_operations; 212 213 switch (mode & S_IFMT) { 214 case S_IFIFO: 215 case S_IFBLK: 216 case S_IFCHR: 217 case S_IFSOCK: 218 if(!v9ses->extended) { 219 dprintk(DEBUG_ERROR, "special files without extended mode\n"); 220 return ERR_PTR(-EINVAL); 221 } 222 init_special_inode(inode, inode->i_mode, 223 inode->i_rdev); 224 break; 225 case S_IFREG: 226 inode->i_op = &v9fs_file_inode_operations; 227 inode->i_fop = &v9fs_file_operations; 228 break; 229 case S_IFLNK: 230 if(!v9ses->extended) { 231 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); 232 return ERR_PTR(-EINVAL); 233 } 234 inode->i_op = &v9fs_symlink_inode_operations; 235 break; 236 case S_IFDIR: 237 inode->i_nlink++; 238 if(v9ses->extended) 239 inode->i_op = &v9fs_dir_inode_operations_ext; 240 else 241 inode->i_op = &v9fs_dir_inode_operations; 242 inode->i_fop = &v9fs_dir_operations; 243 break; 244 default: 245 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 246 mode, mode & S_IFMT); 247 return ERR_PTR(-EINVAL); 248 } 249 } else { 250 eprintk(KERN_WARNING, "Problem allocating inode\n"); 251 return ERR_PTR(-ENOMEM); 252 } 253 return inode; 254 } 255 256 static int 257 v9fs_create(struct v9fs_session_info *v9ses, u32 pfid, char *name, u32 perm, 258 u8 mode, char *extension, u32 *fidp, struct v9fs_qid *qid, u32 *iounit) 259 { 260 u32 fid; 261 int err; 262 struct v9fs_fcall *fcall; 263 264 fid = v9fs_get_idpool(&v9ses->fidpool); 265 if (fid < 0) { 266 eprintk(KERN_WARNING, "no free fids available\n"); 267 return -ENOSPC; 268 } 269 270 err = v9fs_t_walk(v9ses, pfid, fid, NULL, &fcall); 271 if (err < 0) { 272 PRINT_FCALL_ERROR("clone error", fcall); 273 if (fcall && fcall->id == RWALK) 274 goto clunk_fid; 275 else 276 goto put_fid; 277 } 278 kfree(fcall); 279 280 err = v9fs_t_create(v9ses, fid, name, perm, mode, extension, &fcall); 281 if (err < 0) { 282 PRINT_FCALL_ERROR("create fails", fcall); 283 goto clunk_fid; 284 } 285 286 if (iounit) 287 *iounit = fcall->params.rcreate.iounit; 288 289 if (qid) 290 *qid = fcall->params.rcreate.qid; 291 292 if (fidp) 293 *fidp = fid; 294 295 kfree(fcall); 296 return 0; 297 298 clunk_fid: 299 v9fs_t_clunk(v9ses, fid); 300 fid = V9FS_NOFID; 301 302 put_fid: 303 if (fid != V9FS_NOFID) 304 v9fs_put_idpool(fid, &v9ses->fidpool); 305 306 kfree(fcall); 307 return err; 308 } 309 310 static struct v9fs_fid* 311 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry) 312 { 313 int err; 314 u32 nfid; 315 struct v9fs_fid *ret; 316 struct v9fs_fcall *fcall; 317 318 nfid = v9fs_get_idpool(&v9ses->fidpool); 319 if (nfid < 0) { 320 eprintk(KERN_WARNING, "no free fids available\n"); 321 return ERR_PTR(-ENOSPC); 322 } 323 324 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name, 325 &fcall); 326 327 if (err < 0) { 328 if (fcall && fcall->id == RWALK) 329 goto clunk_fid; 330 331 PRINT_FCALL_ERROR("walk error", fcall); 332 v9fs_put_idpool(nfid, &v9ses->fidpool); 333 goto error; 334 } 335 336 kfree(fcall); 337 fcall = NULL; 338 ret = v9fs_fid_create(v9ses, nfid); 339 if (!ret) { 340 err = -ENOMEM; 341 goto clunk_fid; 342 } 343 344 err = v9fs_fid_insert(ret, dentry); 345 if (err < 0) { 346 v9fs_fid_destroy(ret); 347 goto clunk_fid; 348 } 349 350 return ret; 351 352 clunk_fid: 353 v9fs_t_clunk(v9ses, nfid); 354 355 error: 356 kfree(fcall); 357 return ERR_PTR(err); 358 } 359 360 static struct inode * 361 v9fs_inode_from_fid(struct v9fs_session_info *v9ses, u32 fid, 362 struct super_block *sb) 363 { 364 int err, umode; 365 struct inode *ret; 366 struct v9fs_fcall *fcall; 367 368 ret = NULL; 369 err = v9fs_t_stat(v9ses, fid, &fcall); 370 if (err) { 371 PRINT_FCALL_ERROR("stat error", fcall); 372 goto error; 373 } 374 375 umode = p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode); 376 ret = v9fs_get_inode(sb, umode); 377 if (IS_ERR(ret)) { 378 err = PTR_ERR(ret); 379 ret = NULL; 380 goto error; 381 } 382 383 v9fs_stat2inode(&fcall->params.rstat.stat, ret, sb); 384 kfree(fcall); 385 return ret; 386 387 error: 388 kfree(fcall); 389 if (ret) 390 iput(ret); 391 392 return ERR_PTR(err); 393 } 394 395 /** 396 * v9fs_remove - helper function to remove files and directories 397 * @dir: directory inode that is being deleted 398 * @file: dentry that is being deleted 399 * @rmdir: removing a directory 400 * 401 */ 402 403 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 404 { 405 struct v9fs_fcall *fcall = NULL; 406 struct super_block *sb = NULL; 407 struct v9fs_session_info *v9ses = NULL; 408 struct v9fs_fid *v9fid = NULL; 409 struct inode *file_inode = NULL; 410 int fid = -1; 411 int result = 0; 412 413 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 414 rmdir); 415 416 file_inode = file->d_inode; 417 sb = file_inode->i_sb; 418 v9ses = v9fs_inode2v9ses(file_inode); 419 v9fid = v9fs_fid_lookup(file); 420 421 if (!v9fid) { 422 dprintk(DEBUG_ERROR, 423 "no v9fs_fid\n"); 424 return -EBADF; 425 } 426 427 fid = v9fid->fid; 428 if (fid < 0) { 429 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", 430 file_inode->i_ino); 431 return -EBADF; 432 } 433 434 result = v9fs_t_remove(v9ses, fid, &fcall); 435 if (result < 0) { 436 PRINT_FCALL_ERROR("remove fails", fcall); 437 } 438 439 v9fs_put_idpool(fid, &v9ses->fidpool); 440 v9fs_fid_destroy(v9fid); 441 442 kfree(fcall); 443 return result; 444 } 445 446 static int 447 v9fs_open_created(struct inode *inode, struct file *file) 448 { 449 return 0; 450 } 451 452 /** 453 * v9fs_vfs_create - VFS hook to create files 454 * @inode: directory inode that is being deleted 455 * @dentry: dentry that is being deleted 456 * @mode: create permissions 457 * @nd: path information 458 * 459 */ 460 461 static int 462 v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode, 463 struct nameidata *nd) 464 { 465 int err; 466 u32 fid, perm, iounit; 467 int flags; 468 struct v9fs_session_info *v9ses; 469 struct v9fs_fid *dfid, *vfid, *ffid; 470 struct inode *inode; 471 struct v9fs_qid qid; 472 struct file *filp; 473 474 inode = NULL; 475 vfid = NULL; 476 v9ses = v9fs_inode2v9ses(dir); 477 dfid = v9fs_fid_lookup(dentry->d_parent); 478 perm = unixmode2p9mode(v9ses, mode); 479 480 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 error; 490 491 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 492 if (IS_ERR(vfid)) { 493 err = PTR_ERR(vfid); 494 vfid = NULL; 495 goto error; 496 } 497 498 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 499 if (IS_ERR(inode)) { 500 err = PTR_ERR(inode); 501 inode = NULL; 502 goto error; 503 } 504 505 dentry->d_op = &v9fs_dentry_operations; 506 d_instantiate(dentry, inode); 507 508 if (nd && nd->flags & LOOKUP_OPEN) { 509 ffid = v9fs_fid_create(v9ses, fid); 510 if (!ffid) 511 return -ENOMEM; 512 513 filp = lookup_instantiate_filp(nd, dentry, v9fs_open_created); 514 if (IS_ERR(filp)) { 515 v9fs_fid_destroy(ffid); 516 return PTR_ERR(filp); 517 } 518 519 ffid->rdir_pos = 0; 520 ffid->rdir_fcall = NULL; 521 ffid->fidopen = 1; 522 ffid->iounit = iounit; 523 ffid->filp = filp; 524 filp->private_data = ffid; 525 } 526 527 return 0; 528 529 error: 530 if (vfid) 531 v9fs_fid_destroy(vfid); 532 533 return err; 534 } 535 536 /** 537 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 538 * @inode: inode that is being unlinked 539 * @dentry: dentry that is being unlinked 540 * @mode: mode for new directory 541 * 542 */ 543 544 static int v9fs_vfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) 545 { 546 int err; 547 u32 fid, perm; 548 struct v9fs_session_info *v9ses; 549 struct v9fs_fid *dfid, *vfid; 550 struct inode *inode; 551 552 inode = NULL; 553 vfid = NULL; 554 v9ses = v9fs_inode2v9ses(dir); 555 dfid = v9fs_fid_lookup(dentry->d_parent); 556 perm = unixmode2p9mode(v9ses, mode | S_IFDIR); 557 558 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 559 perm, V9FS_OREAD, NULL, &fid, NULL, NULL); 560 561 if (err) { 562 dprintk(DEBUG_ERROR, "create error %d\n", err); 563 goto error; 564 } 565 566 err = v9fs_t_clunk(v9ses, fid); 567 if (err) { 568 dprintk(DEBUG_ERROR, "clunk error %d\n", err); 569 goto error; 570 } 571 572 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 573 if (IS_ERR(vfid)) { 574 err = PTR_ERR(vfid); 575 vfid = NULL; 576 goto error; 577 } 578 579 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 580 if (IS_ERR(inode)) { 581 err = PTR_ERR(inode); 582 inode = NULL; 583 goto error; 584 } 585 586 dentry->d_op = &v9fs_dentry_operations; 587 d_instantiate(dentry, inode); 588 return 0; 589 590 error: 591 if (vfid) 592 v9fs_fid_destroy(vfid); 593 594 return err; 595 } 596 597 /** 598 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 599 * @dir: inode that is being walked from 600 * @dentry: dentry that is being walked to? 601 * @nameidata: path data 602 * 603 */ 604 605 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 606 struct nameidata *nameidata) 607 { 608 struct super_block *sb; 609 struct v9fs_session_info *v9ses; 610 struct v9fs_fid *dirfid; 611 struct v9fs_fid *fid; 612 struct inode *inode; 613 struct v9fs_fcall *fcall = NULL; 614 int dirfidnum = -1; 615 int newfid = -1; 616 int result = 0; 617 618 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 619 dir, dentry->d_name.name, dentry, nameidata); 620 621 sb = dir->i_sb; 622 v9ses = v9fs_inode2v9ses(dir); 623 dentry->d_op = &v9fs_dentry_operations; 624 dirfid = v9fs_fid_lookup(dentry->d_parent); 625 626 if (!dirfid) { 627 dprintk(DEBUG_ERROR, "no dirfid\n"); 628 return ERR_PTR(-EINVAL); 629 } 630 631 dirfidnum = dirfid->fid; 632 633 if (dirfidnum < 0) { 634 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", 635 dir, dir->i_ino); 636 return ERR_PTR(-EBADF); 637 } 638 639 newfid = v9fs_get_idpool(&v9ses->fidpool); 640 if (newfid < 0) { 641 eprintk(KERN_WARNING, "newfid fails!\n"); 642 return ERR_PTR(-ENOSPC); 643 } 644 645 result = v9fs_t_walk(v9ses, dirfidnum, newfid, 646 (char *)dentry->d_name.name, &fcall); 647 648 if (result < 0) { 649 if (fcall && fcall->id == RWALK) 650 v9fs_t_clunk(v9ses, newfid); 651 else 652 v9fs_put_idpool(newfid, &v9ses->fidpool); 653 654 if (result == -ENOENT) { 655 d_add(dentry, NULL); 656 dprintk(DEBUG_VFS, 657 "Return negative dentry %p count %d\n", 658 dentry, atomic_read(&dentry->d_count)); 659 kfree(fcall); 660 return NULL; 661 } 662 dprintk(DEBUG_ERROR, "walk error:%d\n", result); 663 goto FreeFcall; 664 } 665 kfree(fcall); 666 667 result = v9fs_t_stat(v9ses, newfid, &fcall); 668 if (result < 0) { 669 dprintk(DEBUG_ERROR, "stat error\n"); 670 goto FreeFcall; 671 } 672 673 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, 674 fcall->params.rstat.stat.mode)); 675 676 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { 677 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", 678 PTR_ERR(inode)); 679 680 result = -ENOSPC; 681 goto FreeFcall; 682 } 683 684 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); 685 686 fid = v9fs_fid_create(v9ses, newfid); 687 if (fid == NULL) { 688 dprintk(DEBUG_ERROR, "couldn't insert\n"); 689 result = -ENOMEM; 690 goto FreeFcall; 691 } 692 693 result = v9fs_fid_insert(fid, dentry); 694 if (result < 0) 695 goto FreeFcall; 696 697 fid->qid = fcall->params.rstat.stat.qid; 698 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); 699 700 d_add(dentry, inode); 701 kfree(fcall); 702 703 return NULL; 704 705 FreeFcall: 706 kfree(fcall); 707 return ERR_PTR(result); 708 } 709 710 /** 711 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 712 * @i: inode that is being unlinked 713 * @d: dentry that is being unlinked 714 * 715 */ 716 717 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 718 { 719 return v9fs_remove(i, d, 0); 720 } 721 722 /** 723 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 724 * @i: inode that is being unlinked 725 * @d: dentry that is being unlinked 726 * 727 */ 728 729 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 730 { 731 return v9fs_remove(i, d, 1); 732 } 733 734 /** 735 * v9fs_vfs_rename - VFS hook to rename an inode 736 * @old_dir: old dir inode 737 * @old_dentry: old dentry 738 * @new_dir: new dir inode 739 * @new_dentry: new dentry 740 * 741 */ 742 743 static int 744 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 745 struct inode *new_dir, struct dentry *new_dentry) 746 { 747 struct inode *old_inode = old_dentry->d_inode; 748 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); 749 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); 750 struct v9fs_fid *olddirfid = 751 v9fs_fid_lookup(old_dentry->d_parent); 752 struct v9fs_fid *newdirfid = 753 v9fs_fid_lookup(new_dentry->d_parent); 754 struct v9fs_wstat wstat; 755 struct v9fs_fcall *fcall = NULL; 756 int fid = -1; 757 int olddirfidnum = -1; 758 int newdirfidnum = -1; 759 int retval = 0; 760 761 dprintk(DEBUG_VFS, "\n"); 762 763 if ((!oldfid) || (!olddirfid) || (!newdirfid)) { 764 dprintk(DEBUG_ERROR, "problem with arguments\n"); 765 return -EBADF; 766 } 767 768 /* 9P can only handle file rename in the same directory */ 769 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 770 dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); 771 retval = -EPERM; 772 goto FreeFcallnBail; 773 } 774 775 fid = oldfid->fid; 776 olddirfidnum = olddirfid->fid; 777 newdirfidnum = newdirfid->fid; 778 779 if (fid < 0) { 780 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", 781 old_inode->i_ino); 782 retval = -EBADF; 783 goto FreeFcallnBail; 784 } 785 786 v9fs_blank_wstat(&wstat); 787 wstat.muid = v9ses->name; 788 wstat.name = (char *) new_dentry->d_name.name; 789 790 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); 791 792 FreeFcallnBail: 793 if (retval < 0) 794 PRINT_FCALL_ERROR("wstat error", fcall); 795 796 kfree(fcall); 797 return retval; 798 } 799 800 /** 801 * v9fs_vfs_getattr - retrieve file metadata 802 * @mnt - mount information 803 * @dentry - file to get attributes on 804 * @stat - metadata structure to populate 805 * 806 */ 807 808 static int 809 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 810 struct kstat *stat) 811 { 812 struct v9fs_fcall *fcall = NULL; 813 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 814 struct v9fs_fid *fid = v9fs_fid_lookup(dentry); 815 int err = -EPERM; 816 817 dprintk(DEBUG_VFS, "dentry: %p\n", dentry); 818 if (!fid) { 819 dprintk(DEBUG_ERROR, 820 "couldn't find fid associated with dentry\n"); 821 return -EBADF; 822 } 823 824 err = v9fs_t_stat(v9ses, fid->fid, &fcall); 825 826 if (err < 0) 827 dprintk(DEBUG_ERROR, "stat error\n"); 828 else { 829 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, 830 dentry->d_inode->i_sb); 831 generic_fillattr(dentry->d_inode, stat); 832 } 833 834 kfree(fcall); 835 return err; 836 } 837 838 /** 839 * v9fs_vfs_setattr - set file metadata 840 * @dentry: file whose metadata to set 841 * @iattr: metadata assignment structure 842 * 843 */ 844 845 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 846 { 847 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 848 struct v9fs_fid *fid = v9fs_fid_lookup(dentry); 849 struct v9fs_fcall *fcall = NULL; 850 struct v9fs_wstat wstat; 851 int res = -EPERM; 852 853 dprintk(DEBUG_VFS, "\n"); 854 855 if (!fid) { 856 dprintk(DEBUG_ERROR, 857 "Couldn't find fid associated with dentry\n"); 858 return -EBADF; 859 } 860 861 v9fs_blank_wstat(&wstat); 862 if (iattr->ia_valid & ATTR_MODE) 863 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 864 865 if (iattr->ia_valid & ATTR_MTIME) 866 wstat.mtime = iattr->ia_mtime.tv_sec; 867 868 if (iattr->ia_valid & ATTR_ATIME) 869 wstat.atime = iattr->ia_atime.tv_sec; 870 871 if (iattr->ia_valid & ATTR_SIZE) 872 wstat.length = iattr->ia_size; 873 874 if (v9ses->extended) { 875 if (iattr->ia_valid & ATTR_UID) 876 wstat.n_uid = iattr->ia_uid; 877 878 if (iattr->ia_valid & ATTR_GID) 879 wstat.n_gid = iattr->ia_gid; 880 } 881 882 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); 883 884 if (res < 0) 885 PRINT_FCALL_ERROR("wstat error", fcall); 886 887 kfree(fcall); 888 if (res >= 0) 889 res = inode_setattr(dentry->d_inode, iattr); 890 891 return res; 892 } 893 894 /** 895 * v9fs_stat2inode - populate an inode structure with mistat info 896 * @stat: Plan 9 metadata (mistat) structure 897 * @inode: inode to populate 898 * @sb: superblock of filesystem 899 * 900 */ 901 902 void 903 v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, 904 struct super_block *sb) 905 { 906 int n; 907 char ext[32]; 908 struct v9fs_session_info *v9ses = sb->s_fs_info; 909 910 inode->i_nlink = 1; 911 912 inode->i_atime.tv_sec = stat->atime; 913 inode->i_mtime.tv_sec = stat->mtime; 914 inode->i_ctime.tv_sec = stat->mtime; 915 916 inode->i_uid = v9ses->uid; 917 inode->i_gid = v9ses->gid; 918 919 if (v9ses->extended) { 920 inode->i_uid = stat->n_uid; 921 inode->i_gid = stat->n_gid; 922 } 923 924 inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 925 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 926 char type = 0; 927 int major = -1; 928 int minor = -1; 929 930 n = stat->extension.len; 931 if (n > sizeof(ext)-1) 932 n = sizeof(ext)-1; 933 memmove(ext, stat->extension.str, n); 934 ext[n] = 0; 935 sscanf(ext, "%c %u %u", &type, &major, &minor); 936 switch (type) { 937 case 'c': 938 inode->i_mode &= ~S_IFBLK; 939 inode->i_mode |= S_IFCHR; 940 break; 941 case 'b': 942 break; 943 default: 944 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", 945 type, stat->extension.len, stat->extension.str); 946 }; 947 inode->i_rdev = MKDEV(major, minor); 948 } else 949 inode->i_rdev = 0; 950 951 inode->i_size = stat->length; 952 953 inode->i_blksize = sb->s_blocksize; 954 inode->i_blocks = 955 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; 956 } 957 958 /** 959 * v9fs_qid2ino - convert qid into inode number 960 * @qid: qid to hash 961 * 962 * BUG: potential for inode number collisions? 963 */ 964 965 ino_t v9fs_qid2ino(struct v9fs_qid *qid) 966 { 967 u64 path = qid->path + 2; 968 ino_t i = 0; 969 970 if (sizeof(ino_t) == sizeof(path)) 971 memcpy(&i, &path, sizeof(ino_t)); 972 else 973 i = (ino_t) (path ^ (path >> 32)); 974 975 return i; 976 } 977 978 /** 979 * v9fs_readlink - read a symlink's location (internal version) 980 * @dentry: dentry for symlink 981 * @buffer: buffer to load symlink location into 982 * @buflen: length of buffer 983 * 984 */ 985 986 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 987 { 988 int retval = -EPERM; 989 990 struct v9fs_fcall *fcall = NULL; 991 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 992 struct v9fs_fid *fid = v9fs_fid_lookup(dentry); 993 994 if (!fid) { 995 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); 996 retval = -EBADF; 997 goto FreeFcall; 998 } 999 1000 if (!v9ses->extended) { 1001 retval = -EBADF; 1002 dprintk(DEBUG_ERROR, "not extended\n"); 1003 goto FreeFcall; 1004 } 1005 1006 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); 1007 retval = v9fs_t_stat(v9ses, fid->fid, &fcall); 1008 1009 if (retval < 0) { 1010 dprintk(DEBUG_ERROR, "stat error\n"); 1011 goto FreeFcall; 1012 } 1013 1014 if (!fcall) 1015 return -EIO; 1016 1017 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { 1018 retval = -EINVAL; 1019 goto FreeFcall; 1020 } 1021 1022 /* copy extension buffer into buffer */ 1023 if (fcall->params.rstat.stat.extension.len < buflen) 1024 buflen = fcall->params.rstat.stat.extension.len + 1; 1025 1026 memmove(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); 1027 buffer[buflen-1] = 0; 1028 1029 dprintk(DEBUG_ERROR, "%s -> %.*s (%s)\n", dentry->d_name.name, fcall->params.rstat.stat.extension.len, 1030 fcall->params.rstat.stat.extension.str, buffer); 1031 retval = buflen; 1032 1033 FreeFcall: 1034 kfree(fcall); 1035 1036 return retval; 1037 } 1038 1039 /** 1040 * v9fs_vfs_readlink - read a symlink's location 1041 * @dentry: dentry for symlink 1042 * @buf: buffer to load symlink location into 1043 * @buflen: length of buffer 1044 * 1045 */ 1046 1047 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 1048 int buflen) 1049 { 1050 int retval; 1051 int ret; 1052 char *link = __getname(); 1053 1054 if (unlikely(!link)) 1055 return -ENOMEM; 1056 1057 if (buflen > PATH_MAX) 1058 buflen = PATH_MAX; 1059 1060 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 1061 1062 retval = v9fs_readlink(dentry, link, buflen); 1063 1064 if (retval > 0) { 1065 if ((ret = copy_to_user(buffer, link, retval)) != 0) { 1066 dprintk(DEBUG_ERROR, "problem copying to user: %d\n", 1067 ret); 1068 retval = ret; 1069 } 1070 } 1071 1072 __putname(link); 1073 return retval; 1074 } 1075 1076 /** 1077 * v9fs_vfs_follow_link - follow a symlink path 1078 * @dentry: dentry for symlink 1079 * @nd: nameidata 1080 * 1081 */ 1082 1083 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 1084 { 1085 int len = 0; 1086 char *link = __getname(); 1087 1088 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); 1089 1090 if (!link) 1091 link = ERR_PTR(-ENOMEM); 1092 else { 1093 len = v9fs_readlink(dentry, link, PATH_MAX); 1094 1095 if (len < 0) { 1096 __putname(link); 1097 link = ERR_PTR(len); 1098 } else 1099 link[len] = 0; 1100 } 1101 nd_set_link(nd, link); 1102 1103 return NULL; 1104 } 1105 1106 /** 1107 * v9fs_vfs_put_link - release a symlink path 1108 * @dentry: dentry for symlink 1109 * @nd: nameidata 1110 * 1111 */ 1112 1113 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 1114 { 1115 char *s = nd_get_link(nd); 1116 1117 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 1118 if (!IS_ERR(s)) 1119 __putname(s); 1120 } 1121 1122 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 1123 int mode, const char *extension) 1124 { 1125 int err; 1126 u32 fid, perm; 1127 struct v9fs_session_info *v9ses; 1128 struct v9fs_fid *dfid, *vfid; 1129 struct inode *inode; 1130 1131 inode = NULL; 1132 vfid = NULL; 1133 v9ses = v9fs_inode2v9ses(dir); 1134 dfid = v9fs_fid_lookup(dentry->d_parent); 1135 perm = unixmode2p9mode(v9ses, mode); 1136 1137 if (!v9ses->extended) { 1138 dprintk(DEBUG_ERROR, "not extended\n"); 1139 return -EPERM; 1140 } 1141 1142 err = v9fs_create(v9ses, dfid->fid, (char *) dentry->d_name.name, 1143 perm, V9FS_OREAD, (char *) extension, &fid, NULL, NULL); 1144 1145 if (err) 1146 goto error; 1147 1148 err = v9fs_t_clunk(v9ses, fid); 1149 if (err) 1150 goto error; 1151 1152 vfid = v9fs_clone_walk(v9ses, dfid->fid, dentry); 1153 if (IS_ERR(vfid)) { 1154 err = PTR_ERR(vfid); 1155 vfid = NULL; 1156 goto error; 1157 } 1158 1159 inode = v9fs_inode_from_fid(v9ses, vfid->fid, dir->i_sb); 1160 if (IS_ERR(inode)) { 1161 err = PTR_ERR(inode); 1162 inode = NULL; 1163 goto error; 1164 } 1165 1166 dentry->d_op = &v9fs_dentry_operations; 1167 d_instantiate(dentry, inode); 1168 return 0; 1169 1170 error: 1171 if (vfid) 1172 v9fs_fid_destroy(vfid); 1173 1174 return err; 1175 1176 } 1177 1178 /** 1179 * v9fs_vfs_symlink - helper function to create symlinks 1180 * @dir: directory inode containing symlink 1181 * @dentry: dentry for symlink 1182 * @symname: symlink data 1183 * 1184 * See 9P2000.u RFC for more information 1185 * 1186 */ 1187 1188 static int 1189 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1190 { 1191 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1192 symname); 1193 1194 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1195 } 1196 1197 /** 1198 * v9fs_vfs_link - create a hardlink 1199 * @old_dentry: dentry for file to link to 1200 * @dir: inode destination for new link 1201 * @dentry: dentry for link 1202 * 1203 */ 1204 1205 /* XXX - lots of code dup'd from symlink and creates, 1206 * figure out a better reuse strategy 1207 */ 1208 1209 static int 1210 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1211 struct dentry *dentry) 1212 { 1213 int retval; 1214 struct v9fs_fid *oldfid; 1215 char *name; 1216 1217 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1218 old_dentry->d_name.name); 1219 1220 oldfid = v9fs_fid_lookup(old_dentry); 1221 if (!oldfid) { 1222 dprintk(DEBUG_ERROR, "can't find oldfid\n"); 1223 return -EPERM; 1224 } 1225 1226 name = __getname(); 1227 if (unlikely(!name)) 1228 return -ENOMEM; 1229 1230 sprintf(name, "%d\n", oldfid->fid); 1231 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); 1232 __putname(name); 1233 1234 return retval; 1235 } 1236 1237 /** 1238 * v9fs_vfs_mknod - create a special file 1239 * @dir: inode destination for new link 1240 * @dentry: dentry for file 1241 * @mode: mode for creation 1242 * @dev_t: device associated with special file 1243 * 1244 */ 1245 1246 static int 1247 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1248 { 1249 int retval; 1250 char *name; 1251 1252 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1253 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1254 1255 if (!new_valid_dev(rdev)) 1256 return -EINVAL; 1257 1258 name = __getname(); 1259 if (!name) 1260 return -ENOMEM; 1261 /* build extension */ 1262 if (S_ISBLK(mode)) 1263 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1264 else if (S_ISCHR(mode)) 1265 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1266 else if (S_ISFIFO(mode)) 1267 *name = 0; 1268 else { 1269 __putname(name); 1270 return -EINVAL; 1271 } 1272 1273 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1274 __putname(name); 1275 1276 return retval; 1277 } 1278 1279 static struct inode_operations v9fs_dir_inode_operations_ext = { 1280 .create = v9fs_vfs_create, 1281 .lookup = v9fs_vfs_lookup, 1282 .symlink = v9fs_vfs_symlink, 1283 .link = v9fs_vfs_link, 1284 .unlink = v9fs_vfs_unlink, 1285 .mkdir = v9fs_vfs_mkdir, 1286 .rmdir = v9fs_vfs_rmdir, 1287 .mknod = v9fs_vfs_mknod, 1288 .rename = v9fs_vfs_rename, 1289 .readlink = v9fs_vfs_readlink, 1290 .getattr = v9fs_vfs_getattr, 1291 .setattr = v9fs_vfs_setattr, 1292 }; 1293 1294 static struct inode_operations v9fs_dir_inode_operations = { 1295 .create = v9fs_vfs_create, 1296 .lookup = v9fs_vfs_lookup, 1297 .unlink = v9fs_vfs_unlink, 1298 .mkdir = v9fs_vfs_mkdir, 1299 .rmdir = v9fs_vfs_rmdir, 1300 .mknod = v9fs_vfs_mknod, 1301 .rename = v9fs_vfs_rename, 1302 .getattr = v9fs_vfs_getattr, 1303 .setattr = v9fs_vfs_setattr, 1304 }; 1305 1306 static struct inode_operations v9fs_file_inode_operations = { 1307 .getattr = v9fs_vfs_getattr, 1308 .setattr = v9fs_vfs_setattr, 1309 }; 1310 1311 static struct inode_operations v9fs_symlink_inode_operations = { 1312 .readlink = v9fs_vfs_readlink, 1313 .follow_link = v9fs_vfs_follow_link, 1314 .put_link = v9fs_vfs_put_link, 1315 .getattr = v9fs_vfs_getattr, 1316 .setattr = v9fs_vfs_setattr, 1317 }; 1318