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 as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to: 21 * Free Software Foundation 22 * 51 Franklin Street, Fifth Floor 23 * Boston, MA 02111-1301 USA 24 * 25 */ 26 27 #include <linux/module.h> 28 #include <linux/errno.h> 29 #include <linux/fs.h> 30 #include <linux/file.h> 31 #include <linux/pagemap.h> 32 #include <linux/stat.h> 33 #include <linux/string.h> 34 #include <linux/smp_lock.h> 35 #include <linux/inet.h> 36 #include <linux/namei.h> 37 #include <linux/idr.h> 38 39 #include "debug.h" 40 #include "v9fs.h" 41 #include "9p.h" 42 #include "v9fs_vfs.h" 43 #include "fid.h" 44 45 static struct inode_operations v9fs_dir_inode_operations; 46 static struct inode_operations v9fs_dir_inode_operations_ext; 47 static struct inode_operations v9fs_file_inode_operations; 48 static struct inode_operations v9fs_symlink_inode_operations; 49 50 /** 51 * unixmode2p9mode - convert unix mode bits to plan 9 52 * @v9ses: v9fs session information 53 * @mode: mode to convert 54 * 55 */ 56 57 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode) 58 { 59 int res; 60 res = mode & 0777; 61 if (S_ISDIR(mode)) 62 res |= V9FS_DMDIR; 63 if (v9ses->extended) { 64 if (S_ISLNK(mode)) 65 res |= V9FS_DMSYMLINK; 66 if (v9ses->nodev == 0) { 67 if (S_ISSOCK(mode)) 68 res |= V9FS_DMSOCKET; 69 if (S_ISFIFO(mode)) 70 res |= V9FS_DMNAMEDPIPE; 71 if (S_ISBLK(mode)) 72 res |= V9FS_DMDEVICE; 73 if (S_ISCHR(mode)) 74 res |= V9FS_DMDEVICE; 75 } 76 77 if ((mode & S_ISUID) == S_ISUID) 78 res |= V9FS_DMSETUID; 79 if ((mode & S_ISGID) == S_ISGID) 80 res |= V9FS_DMSETGID; 81 if ((mode & V9FS_DMLINK)) 82 res |= V9FS_DMLINK; 83 } 84 85 return res; 86 } 87 88 /** 89 * p9mode2unixmode- convert plan9 mode bits to unix mode bits 90 * @v9ses: v9fs session information 91 * @mode: mode to convert 92 * 93 */ 94 95 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode) 96 { 97 int res; 98 99 res = mode & 0777; 100 101 if ((mode & V9FS_DMDIR) == V9FS_DMDIR) 102 res |= S_IFDIR; 103 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended)) 104 res |= S_IFLNK; 105 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended) 106 && (v9ses->nodev == 0)) 107 res |= S_IFSOCK; 108 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended) 109 && (v9ses->nodev == 0)) 110 res |= S_IFIFO; 111 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended) 112 && (v9ses->nodev == 0)) 113 res |= S_IFBLK; 114 else 115 res |= S_IFREG; 116 117 if (v9ses->extended) { 118 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID) 119 res |= S_ISUID; 120 121 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID) 122 res |= S_ISGID; 123 } 124 125 return res; 126 } 127 128 /** 129 * v9fs_blank_wstat - helper function to setup a 9P stat structure 130 * @v9ses: 9P session info (for determining extended mode) 131 * @wstat: structure to initialize 132 * 133 */ 134 135 static void 136 v9fs_blank_wstat(struct v9fs_wstat *wstat) 137 { 138 wstat->type = ~0; 139 wstat->dev = ~0; 140 wstat->qid.type = ~0; 141 wstat->qid.version = ~0; 142 *((long long *)&wstat->qid.path) = ~0; 143 wstat->mode = ~0; 144 wstat->atime = ~0; 145 wstat->mtime = ~0; 146 wstat->length = ~0; 147 wstat->name = NULL; 148 wstat->uid = NULL; 149 wstat->gid = NULL; 150 wstat->muid = NULL; 151 wstat->n_uid = ~0; 152 wstat->n_gid = ~0; 153 wstat->n_muid = ~0; 154 wstat->extension = NULL; 155 } 156 157 /** 158 * v9fs_get_inode - helper function to setup an inode 159 * @sb: superblock 160 * @mode: mode to setup inode with 161 * 162 */ 163 164 struct inode *v9fs_get_inode(struct super_block *sb, int mode) 165 { 166 struct inode *inode = NULL; 167 struct v9fs_session_info *v9ses = sb->s_fs_info; 168 169 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode); 170 171 inode = new_inode(sb); 172 if (inode) { 173 inode->i_mode = mode; 174 inode->i_uid = current->fsuid; 175 inode->i_gid = current->fsgid; 176 inode->i_blksize = sb->s_blocksize; 177 inode->i_blocks = 0; 178 inode->i_rdev = 0; 179 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; 180 181 switch (mode & S_IFMT) { 182 case S_IFIFO: 183 case S_IFBLK: 184 case S_IFCHR: 185 case S_IFSOCK: 186 if(!v9ses->extended) { 187 dprintk(DEBUG_ERROR, "special files without extended mode\n"); 188 return ERR_PTR(-EINVAL); 189 } 190 init_special_inode(inode, inode->i_mode, 191 inode->i_rdev); 192 break; 193 case S_IFREG: 194 inode->i_op = &v9fs_file_inode_operations; 195 inode->i_fop = &v9fs_file_operations; 196 break; 197 case S_IFLNK: 198 if(!v9ses->extended) { 199 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n"); 200 return ERR_PTR(-EINVAL); 201 } 202 inode->i_op = &v9fs_symlink_inode_operations; 203 break; 204 case S_IFDIR: 205 inode->i_nlink++; 206 if(v9ses->extended) 207 inode->i_op = &v9fs_dir_inode_operations_ext; 208 else 209 inode->i_op = &v9fs_dir_inode_operations; 210 inode->i_fop = &v9fs_dir_operations; 211 break; 212 default: 213 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n", 214 mode, mode & S_IFMT); 215 return ERR_PTR(-EINVAL); 216 } 217 } else { 218 eprintk(KERN_WARNING, "Problem allocating inode\n"); 219 return ERR_PTR(-ENOMEM); 220 } 221 return inode; 222 } 223 224 /** 225 * v9fs_create - helper function to create files and directories 226 * @dir: directory inode file is being created in 227 * @file_dentry: dentry file is being created in 228 * @perm: permissions file is being created with 229 * @open_mode: resulting open mode for file 230 * 231 */ 232 233 static int 234 v9fs_create(struct inode *dir, 235 struct dentry *file_dentry, 236 unsigned int perm, unsigned int open_mode) 237 { 238 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir); 239 struct super_block *sb = dir->i_sb; 240 struct v9fs_fid *dirfid = 241 v9fs_fid_lookup(file_dentry->d_parent); 242 struct v9fs_fid *fid = NULL; 243 struct inode *file_inode = NULL; 244 struct v9fs_fcall *fcall = NULL; 245 struct v9fs_qid qid; 246 int dirfidnum = -1; 247 long newfid = -1; 248 int result = 0; 249 unsigned int iounit = 0; 250 int wfidno = -1; 251 int err; 252 253 perm = unixmode2p9mode(v9ses, perm); 254 255 dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir, 256 file_dentry, perm, open_mode); 257 258 if (!dirfid) 259 return -EBADF; 260 261 dirfidnum = dirfid->fid; 262 if (dirfidnum < 0) { 263 dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n", 264 dir->i_ino); 265 return -EBADF; 266 } 267 268 if (file_dentry->d_inode) { 269 dprintk(DEBUG_ERROR, 270 "Odd. There is an inode for dir %lu, name :%s:\n", 271 dir->i_ino, file_dentry->d_name.name); 272 return -EEXIST; 273 } 274 275 newfid = v9fs_get_idpool(&v9ses->fidpool); 276 if (newfid < 0) { 277 eprintk(KERN_WARNING, "no free fids available\n"); 278 return -ENOSPC; 279 } 280 281 result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall); 282 if (result < 0) { 283 PRINT_FCALL_ERROR("clone error", fcall); 284 v9fs_put_idpool(newfid, &v9ses->fidpool); 285 newfid = -1; 286 goto CleanUpFid; 287 } 288 289 kfree(fcall); 290 fcall = NULL; 291 292 result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name, 293 perm, open_mode, &fcall); 294 if (result < 0) { 295 PRINT_FCALL_ERROR("create fails", fcall); 296 goto CleanUpFid; 297 } 298 299 iounit = fcall->params.rcreate.iounit; 300 qid = fcall->params.rcreate.qid; 301 kfree(fcall); 302 fcall = NULL; 303 304 if (!(perm&V9FS_DMDIR)) { 305 fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1); 306 dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate); 307 if (!fid) { 308 result = -ENOMEM; 309 goto CleanUpFid; 310 } 311 312 fid->qid = qid; 313 fid->iounit = iounit; 314 } else { 315 err = v9fs_t_clunk(v9ses, newfid); 316 newfid = -1; 317 if (err < 0) 318 dprintk(DEBUG_ERROR, "clunk for mkdir failed: %d\n", err); 319 } 320 321 /* walk to the newly created file and put the fid in the dentry */ 322 wfidno = v9fs_get_idpool(&v9ses->fidpool); 323 if (wfidno < 0) { 324 eprintk(KERN_WARNING, "no free fids available\n"); 325 return -ENOSPC; 326 } 327 328 result = v9fs_t_walk(v9ses, dirfidnum, wfidno, 329 (char *) file_dentry->d_name.name, &fcall); 330 if (result < 0) { 331 PRINT_FCALL_ERROR("clone error", fcall); 332 v9fs_put_idpool(wfidno, &v9ses->fidpool); 333 wfidno = -1; 334 goto CleanUpFid; 335 } 336 kfree(fcall); 337 fcall = NULL; 338 339 if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) { 340 v9fs_put_idpool(wfidno, &v9ses->fidpool); 341 342 goto CleanUpFid; 343 } 344 345 if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) || 346 (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) || 347 (perm & V9FS_DMDEVICE)) 348 return 0; 349 350 result = v9fs_t_stat(v9ses, wfidno, &fcall); 351 if (result < 0) { 352 PRINT_FCALL_ERROR("stat error", fcall); 353 goto CleanUpFid; 354 } 355 356 357 file_inode = v9fs_get_inode(sb, 358 p9mode2unixmode(v9ses, fcall->params.rstat.stat.mode)); 359 360 if ((!file_inode) || IS_ERR(file_inode)) { 361 dprintk(DEBUG_ERROR, "create inode failed\n"); 362 result = -EBADF; 363 goto CleanUpFid; 364 } 365 366 v9fs_stat2inode(&fcall->params.rstat.stat, file_inode, sb); 367 kfree(fcall); 368 fcall = NULL; 369 file_dentry->d_op = &v9fs_dentry_operations; 370 d_instantiate(file_dentry, file_inode); 371 372 return 0; 373 374 CleanUpFid: 375 kfree(fcall); 376 fcall = NULL; 377 378 if (newfid >= 0) { 379 err = v9fs_t_clunk(v9ses, newfid); 380 if (err < 0) 381 dprintk(DEBUG_ERROR, "clunk failed: %d\n", err); 382 } 383 if (wfidno >= 0) { 384 err = v9fs_t_clunk(v9ses, wfidno); 385 if (err < 0) 386 dprintk(DEBUG_ERROR, "clunk failed: %d\n", err); 387 } 388 return result; 389 } 390 391 /** 392 * v9fs_remove - helper function to remove files and directories 393 * @dir: directory inode that is being deleted 394 * @file: dentry that is being deleted 395 * @rmdir: removing a directory 396 * 397 */ 398 399 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir) 400 { 401 struct v9fs_fcall *fcall = NULL; 402 struct super_block *sb = NULL; 403 struct v9fs_session_info *v9ses = NULL; 404 struct v9fs_fid *v9fid = NULL; 405 struct inode *file_inode = NULL; 406 int fid = -1; 407 int result = 0; 408 409 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file, 410 rmdir); 411 412 file_inode = file->d_inode; 413 sb = file_inode->i_sb; 414 v9ses = v9fs_inode2v9ses(file_inode); 415 v9fid = v9fs_fid_lookup(file); 416 417 if (!v9fid) { 418 dprintk(DEBUG_ERROR, 419 "no v9fs_fid\n"); 420 return -EBADF; 421 } 422 423 fid = v9fid->fid; 424 if (fid < 0) { 425 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n", 426 file_inode->i_ino); 427 return -EBADF; 428 } 429 430 result = v9fs_t_remove(v9ses, fid, &fcall); 431 if (result < 0) { 432 PRINT_FCALL_ERROR("remove fails", fcall); 433 } else { 434 v9fs_put_idpool(fid, &v9ses->fidpool); 435 v9fs_fid_destroy(v9fid); 436 } 437 438 kfree(fcall); 439 return result; 440 } 441 442 /** 443 * v9fs_vfs_create - VFS hook to create files 444 * @inode: directory inode that is being deleted 445 * @dentry: dentry that is being deleted 446 * @perm: create permissions 447 * @nd: path information 448 * 449 */ 450 451 static int 452 v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm, 453 struct nameidata *nd) 454 { 455 return v9fs_create(inode, dentry, perm, O_RDWR); 456 } 457 458 /** 459 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory 460 * @inode: inode that is being unlinked 461 * @dentry: dentry that is being unlinked 462 * @mode: mode for new directory 463 * 464 */ 465 466 static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode) 467 { 468 return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY); 469 } 470 471 /** 472 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode 473 * @dir: inode that is being walked from 474 * @dentry: dentry that is being walked to? 475 * @nameidata: path data 476 * 477 */ 478 479 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry, 480 struct nameidata *nameidata) 481 { 482 struct super_block *sb; 483 struct v9fs_session_info *v9ses; 484 struct v9fs_fid *dirfid; 485 struct v9fs_fid *fid; 486 struct inode *inode; 487 struct v9fs_fcall *fcall = NULL; 488 int dirfidnum = -1; 489 int newfid = -1; 490 int result = 0; 491 492 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n", 493 dir, dentry->d_iname, dentry, nameidata); 494 495 sb = dir->i_sb; 496 v9ses = v9fs_inode2v9ses(dir); 497 dirfid = v9fs_fid_lookup(dentry->d_parent); 498 499 if (!dirfid) { 500 dprintk(DEBUG_ERROR, "no dirfid\n"); 501 return ERR_PTR(-EINVAL); 502 } 503 504 dirfidnum = dirfid->fid; 505 506 if (dirfidnum < 0) { 507 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n", 508 dir, dir->i_ino); 509 return ERR_PTR(-EBADF); 510 } 511 512 newfid = v9fs_get_idpool(&v9ses->fidpool); 513 if (newfid < 0) { 514 eprintk(KERN_WARNING, "newfid fails!\n"); 515 return ERR_PTR(-ENOSPC); 516 } 517 518 result = 519 v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name, 520 NULL); 521 if (result < 0) { 522 v9fs_put_idpool(newfid, &v9ses->fidpool); 523 if (result == -ENOENT) { 524 d_add(dentry, NULL); 525 dprintk(DEBUG_VFS, 526 "Return negative dentry %p count %d\n", 527 dentry, atomic_read(&dentry->d_count)); 528 return NULL; 529 } 530 dprintk(DEBUG_ERROR, "walk error:%d\n", result); 531 goto FreeFcall; 532 } 533 534 result = v9fs_t_stat(v9ses, newfid, &fcall); 535 if (result < 0) { 536 dprintk(DEBUG_ERROR, "stat error\n"); 537 goto FreeFcall; 538 } 539 540 inode = v9fs_get_inode(sb, p9mode2unixmode(v9ses, 541 fcall->params.rstat.stat.mode)); 542 543 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) { 544 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n", 545 PTR_ERR(inode)); 546 547 result = -ENOSPC; 548 goto FreeFcall; 549 } 550 551 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat.qid); 552 553 fid = v9fs_fid_create(dentry, v9ses, newfid, 0); 554 if (fid == NULL) { 555 dprintk(DEBUG_ERROR, "couldn't insert\n"); 556 result = -ENOMEM; 557 goto FreeFcall; 558 } 559 560 fid->qid = fcall->params.rstat.stat.qid; 561 562 dentry->d_op = &v9fs_dentry_operations; 563 v9fs_stat2inode(&fcall->params.rstat.stat, inode, inode->i_sb); 564 565 d_add(dentry, inode); 566 kfree(fcall); 567 568 return NULL; 569 570 FreeFcall: 571 kfree(fcall); 572 return ERR_PTR(result); 573 } 574 575 /** 576 * v9fs_vfs_unlink - VFS unlink hook to delete an inode 577 * @i: inode that is being unlinked 578 * @d: dentry that is being unlinked 579 * 580 */ 581 582 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d) 583 { 584 return v9fs_remove(i, d, 0); 585 } 586 587 /** 588 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory 589 * @i: inode that is being unlinked 590 * @d: dentry that is being unlinked 591 * 592 */ 593 594 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d) 595 { 596 return v9fs_remove(i, d, 1); 597 } 598 599 /** 600 * v9fs_vfs_rename - VFS hook to rename an inode 601 * @old_dir: old dir inode 602 * @old_dentry: old dentry 603 * @new_dir: new dir inode 604 * @new_dentry: new dentry 605 * 606 */ 607 608 static int 609 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry, 610 struct inode *new_dir, struct dentry *new_dentry) 611 { 612 struct inode *old_inode = old_dentry->d_inode; 613 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode); 614 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry); 615 struct v9fs_fid *olddirfid = 616 v9fs_fid_lookup(old_dentry->d_parent); 617 struct v9fs_fid *newdirfid = 618 v9fs_fid_lookup(new_dentry->d_parent); 619 struct v9fs_wstat wstat; 620 struct v9fs_fcall *fcall = NULL; 621 int fid = -1; 622 int olddirfidnum = -1; 623 int newdirfidnum = -1; 624 int retval = 0; 625 626 dprintk(DEBUG_VFS, "\n"); 627 628 if ((!oldfid) || (!olddirfid) || (!newdirfid)) { 629 dprintk(DEBUG_ERROR, "problem with arguments\n"); 630 return -EBADF; 631 } 632 633 /* 9P can only handle file rename in the same directory */ 634 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) { 635 dprintk(DEBUG_ERROR, "old dir and new dir are different\n"); 636 retval = -EPERM; 637 goto FreeFcallnBail; 638 } 639 640 fid = oldfid->fid; 641 olddirfidnum = olddirfid->fid; 642 newdirfidnum = newdirfid->fid; 643 644 if (fid < 0) { 645 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n", 646 old_inode->i_ino); 647 retval = -EBADF; 648 goto FreeFcallnBail; 649 } 650 651 v9fs_blank_wstat(&wstat); 652 wstat.muid = v9ses->name; 653 wstat.name = (char *) new_dentry->d_name.name; 654 655 retval = v9fs_t_wstat(v9ses, fid, &wstat, &fcall); 656 657 FreeFcallnBail: 658 if (retval < 0) 659 PRINT_FCALL_ERROR("wstat error", fcall); 660 661 kfree(fcall); 662 return retval; 663 } 664 665 /** 666 * v9fs_vfs_getattr - retrieve file metadata 667 * @mnt - mount information 668 * @dentry - file to get attributes on 669 * @stat - metadata structure to populate 670 * 671 */ 672 673 static int 674 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, 675 struct kstat *stat) 676 { 677 struct v9fs_fcall *fcall = NULL; 678 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 679 struct v9fs_fid *fid = v9fs_fid_lookup(dentry); 680 int err = -EPERM; 681 682 dprintk(DEBUG_VFS, "dentry: %p\n", dentry); 683 if (!fid) { 684 dprintk(DEBUG_ERROR, 685 "couldn't find fid associated with dentry\n"); 686 return -EBADF; 687 } 688 689 err = v9fs_t_stat(v9ses, fid->fid, &fcall); 690 691 if (err < 0) 692 dprintk(DEBUG_ERROR, "stat error\n"); 693 else { 694 v9fs_stat2inode(&fcall->params.rstat.stat, dentry->d_inode, 695 dentry->d_inode->i_sb); 696 generic_fillattr(dentry->d_inode, stat); 697 } 698 699 kfree(fcall); 700 return err; 701 } 702 703 /** 704 * v9fs_vfs_setattr - set file metadata 705 * @dentry: file whose metadata to set 706 * @iattr: metadata assignment structure 707 * 708 */ 709 710 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr) 711 { 712 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 713 struct v9fs_fid *fid = v9fs_fid_lookup(dentry); 714 struct v9fs_fcall *fcall = NULL; 715 struct v9fs_wstat wstat; 716 int res = -EPERM; 717 718 dprintk(DEBUG_VFS, "\n"); 719 720 if (!fid) { 721 dprintk(DEBUG_ERROR, 722 "Couldn't find fid associated with dentry\n"); 723 return -EBADF; 724 } 725 726 v9fs_blank_wstat(&wstat); 727 if (iattr->ia_valid & ATTR_MODE) 728 wstat.mode = unixmode2p9mode(v9ses, iattr->ia_mode); 729 730 if (iattr->ia_valid & ATTR_MTIME) 731 wstat.mtime = iattr->ia_mtime.tv_sec; 732 733 if (iattr->ia_valid & ATTR_ATIME) 734 wstat.atime = iattr->ia_atime.tv_sec; 735 736 if (iattr->ia_valid & ATTR_SIZE) 737 wstat.length = iattr->ia_size; 738 739 if (v9ses->extended) { 740 if (iattr->ia_valid & ATTR_UID) 741 wstat.n_uid = iattr->ia_uid; 742 743 if (iattr->ia_valid & ATTR_GID) 744 wstat.n_gid = iattr->ia_gid; 745 } 746 747 res = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); 748 749 if (res < 0) 750 PRINT_FCALL_ERROR("wstat error", fcall); 751 752 kfree(fcall); 753 if (res >= 0) 754 res = inode_setattr(dentry->d_inode, iattr); 755 756 return res; 757 } 758 759 /** 760 * v9fs_stat2inode - populate an inode structure with mistat info 761 * @stat: Plan 9 metadata (mistat) structure 762 * @inode: inode to populate 763 * @sb: superblock of filesystem 764 * 765 */ 766 767 void 768 v9fs_stat2inode(struct v9fs_stat *stat, struct inode *inode, 769 struct super_block *sb) 770 { 771 int n; 772 char ext[32]; 773 struct v9fs_session_info *v9ses = sb->s_fs_info; 774 775 inode->i_nlink = 1; 776 777 inode->i_atime.tv_sec = stat->atime; 778 inode->i_mtime.tv_sec = stat->mtime; 779 inode->i_ctime.tv_sec = stat->mtime; 780 781 inode->i_uid = v9ses->uid; 782 inode->i_gid = v9ses->gid; 783 784 if (v9ses->extended) { 785 inode->i_uid = stat->n_uid; 786 inode->i_gid = stat->n_gid; 787 } 788 789 inode->i_mode = p9mode2unixmode(v9ses, stat->mode); 790 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) { 791 char type = 0; 792 int major = -1; 793 int minor = -1; 794 795 n = stat->extension.len; 796 if (n > sizeof(ext)-1) 797 n = sizeof(ext)-1; 798 memmove(ext, stat->extension.str, n); 799 ext[n] = 0; 800 sscanf(ext, "%c %u %u", &type, &major, &minor); 801 switch (type) { 802 case 'c': 803 inode->i_mode &= ~S_IFBLK; 804 inode->i_mode |= S_IFCHR; 805 break; 806 case 'b': 807 break; 808 default: 809 dprintk(DEBUG_ERROR, "Unknown special type %c (%.*s)\n", 810 type, stat->extension.len, stat->extension.str); 811 }; 812 inode->i_rdev = MKDEV(major, minor); 813 } else 814 inode->i_rdev = 0; 815 816 inode->i_size = stat->length; 817 818 inode->i_blksize = sb->s_blocksize; 819 inode->i_blocks = 820 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits; 821 } 822 823 /** 824 * v9fs_qid2ino - convert qid into inode number 825 * @qid: qid to hash 826 * 827 * BUG: potential for inode number collisions? 828 */ 829 830 ino_t v9fs_qid2ino(struct v9fs_qid *qid) 831 { 832 u64 path = qid->path + 2; 833 ino_t i = 0; 834 835 if (sizeof(ino_t) == sizeof(path)) 836 memcpy(&i, &path, sizeof(ino_t)); 837 else 838 i = (ino_t) (path ^ (path >> 32)); 839 840 return i; 841 } 842 843 /** 844 * v9fs_readlink - read a symlink's location (internal version) 845 * @dentry: dentry for symlink 846 * @buffer: buffer to load symlink location into 847 * @buflen: length of buffer 848 * 849 */ 850 851 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen) 852 { 853 int retval = -EPERM; 854 855 struct v9fs_fcall *fcall = NULL; 856 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode); 857 struct v9fs_fid *fid = v9fs_fid_lookup(dentry); 858 859 if (!fid) { 860 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n"); 861 retval = -EBADF; 862 goto FreeFcall; 863 } 864 865 if (!v9ses->extended) { 866 retval = -EBADF; 867 dprintk(DEBUG_ERROR, "not extended\n"); 868 goto FreeFcall; 869 } 870 871 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name); 872 retval = v9fs_t_stat(v9ses, fid->fid, &fcall); 873 874 if (retval < 0) { 875 dprintk(DEBUG_ERROR, "stat error\n"); 876 goto FreeFcall; 877 } 878 879 if (!fcall) 880 return -EIO; 881 882 if (!(fcall->params.rstat.stat.mode & V9FS_DMSYMLINK)) { 883 retval = -EINVAL; 884 goto FreeFcall; 885 } 886 887 /* copy extension buffer into buffer */ 888 if (fcall->params.rstat.stat.extension.len < buflen) 889 buflen = fcall->params.rstat.stat.extension.len; 890 891 memcpy(buffer, fcall->params.rstat.stat.extension.str, buflen - 1); 892 buffer[buflen-1] = 0; 893 894 retval = buflen; 895 896 FreeFcall: 897 kfree(fcall); 898 899 return retval; 900 } 901 902 /** 903 * v9fs_vfs_readlink - read a symlink's location 904 * @dentry: dentry for symlink 905 * @buf: buffer to load symlink location into 906 * @buflen: length of buffer 907 * 908 */ 909 910 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer, 911 int buflen) 912 { 913 int retval; 914 int ret; 915 char *link = __getname(); 916 917 if (buflen > PATH_MAX) 918 buflen = PATH_MAX; 919 920 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry); 921 922 retval = v9fs_readlink(dentry, link, buflen); 923 924 if (retval > 0) { 925 if ((ret = copy_to_user(buffer, link, retval)) != 0) { 926 dprintk(DEBUG_ERROR, "problem copying to user: %d\n", 927 ret); 928 retval = ret; 929 } 930 } 931 932 __putname(link); 933 return retval; 934 } 935 936 /** 937 * v9fs_vfs_follow_link - follow a symlink path 938 * @dentry: dentry for symlink 939 * @nd: nameidata 940 * 941 */ 942 943 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd) 944 { 945 int len = 0; 946 char *link = __getname(); 947 948 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name); 949 950 if (!link) 951 link = ERR_PTR(-ENOMEM); 952 else { 953 len = v9fs_readlink(dentry, link, strlen(link)); 954 955 if (len < 0) { 956 __putname(link); 957 link = ERR_PTR(len); 958 } else 959 link[len] = 0; 960 } 961 nd_set_link(nd, link); 962 963 return NULL; 964 } 965 966 /** 967 * v9fs_vfs_put_link - release a symlink path 968 * @dentry: dentry for symlink 969 * @nd: nameidata 970 * 971 */ 972 973 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p) 974 { 975 char *s = nd_get_link(nd); 976 977 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s); 978 if (!IS_ERR(s)) 979 __putname(s); 980 } 981 982 static int v9fs_vfs_mkspecial(struct inode *dir, struct dentry *dentry, 983 int mode, const char *extension) 984 { 985 int err, retval; 986 struct v9fs_session_info *v9ses; 987 struct v9fs_fcall *fcall; 988 struct v9fs_fid *fid; 989 struct v9fs_wstat wstat; 990 991 v9ses = v9fs_inode2v9ses(dir); 992 retval = -EPERM; 993 fcall = NULL; 994 995 if (!v9ses->extended) { 996 dprintk(DEBUG_ERROR, "not extended\n"); 997 goto free_mem; 998 } 999 1000 /* issue a create */ 1001 retval = v9fs_create(dir, dentry, mode, 0); 1002 if (retval != 0) 1003 goto free_mem; 1004 1005 fid = v9fs_fid_get_created(dentry); 1006 if (!fid) { 1007 dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n"); 1008 goto free_mem; 1009 } 1010 1011 /* issue a Twstat */ 1012 v9fs_blank_wstat(&wstat); 1013 wstat.muid = v9ses->name; 1014 wstat.extension = (char *) extension; 1015 retval = v9fs_t_wstat(v9ses, fid->fid, &wstat, &fcall); 1016 if (retval < 0) { 1017 PRINT_FCALL_ERROR("wstat error", fcall); 1018 goto free_mem; 1019 } 1020 1021 err = v9fs_t_clunk(v9ses, fid->fid); 1022 if (err < 0) { 1023 dprintk(DEBUG_ERROR, "clunk failed: %d\n", err); 1024 goto free_mem; 1025 } 1026 1027 d_drop(dentry); /* FID - will this also clunk? */ 1028 1029 free_mem: 1030 kfree(fcall); 1031 return retval; 1032 } 1033 1034 /** 1035 * v9fs_vfs_symlink - helper function to create symlinks 1036 * @dir: directory inode containing symlink 1037 * @dentry: dentry for symlink 1038 * @symname: symlink data 1039 * 1040 * See 9P2000.u RFC for more information 1041 * 1042 */ 1043 1044 static int 1045 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 1046 { 1047 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1048 symname); 1049 1050 return v9fs_vfs_mkspecial(dir, dentry, S_IFLNK, symname); 1051 } 1052 1053 /** 1054 * v9fs_vfs_link - create a hardlink 1055 * @old_dentry: dentry for file to link to 1056 * @dir: inode destination for new link 1057 * @dentry: dentry for link 1058 * 1059 */ 1060 1061 /* XXX - lots of code dup'd from symlink and creates, 1062 * figure out a better reuse strategy 1063 */ 1064 1065 static int 1066 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir, 1067 struct dentry *dentry) 1068 { 1069 int retval; 1070 struct v9fs_fid *oldfid; 1071 char *name; 1072 1073 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name, 1074 old_dentry->d_name.name); 1075 1076 oldfid = v9fs_fid_lookup(old_dentry); 1077 if (!oldfid) { 1078 dprintk(DEBUG_ERROR, "can't find oldfid\n"); 1079 return -EPERM; 1080 } 1081 1082 name = __getname(); 1083 sprintf(name, "hardlink(%d)\n", oldfid->fid); 1084 retval = v9fs_vfs_mkspecial(dir, dentry, V9FS_DMLINK, name); 1085 __putname(name); 1086 1087 return retval; 1088 } 1089 1090 /** 1091 * v9fs_vfs_mknod - create a special file 1092 * @dir: inode destination for new link 1093 * @dentry: dentry for file 1094 * @mode: mode for creation 1095 * @dev_t: device associated with special file 1096 * 1097 */ 1098 1099 static int 1100 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) 1101 { 1102 int retval; 1103 char *name; 1104 1105 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino, 1106 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev)); 1107 1108 if (!new_valid_dev(rdev)) 1109 return -EINVAL; 1110 1111 name = __getname(); 1112 /* build extension */ 1113 if (S_ISBLK(mode)) 1114 sprintf(name, "b %u %u", MAJOR(rdev), MINOR(rdev)); 1115 else if (S_ISCHR(mode)) 1116 sprintf(name, "c %u %u", MAJOR(rdev), MINOR(rdev)); 1117 else if (S_ISFIFO(mode)) 1118 *name = 0; 1119 else { 1120 __putname(name); 1121 return -EINVAL; 1122 } 1123 1124 retval = v9fs_vfs_mkspecial(dir, dentry, mode, name); 1125 __putname(name); 1126 1127 return retval; 1128 } 1129 1130 static struct inode_operations v9fs_dir_inode_operations_ext = { 1131 .create = v9fs_vfs_create, 1132 .lookup = v9fs_vfs_lookup, 1133 .symlink = v9fs_vfs_symlink, 1134 .link = v9fs_vfs_link, 1135 .unlink = v9fs_vfs_unlink, 1136 .mkdir = v9fs_vfs_mkdir, 1137 .rmdir = v9fs_vfs_rmdir, 1138 .mknod = v9fs_vfs_mknod, 1139 .rename = v9fs_vfs_rename, 1140 .readlink = v9fs_vfs_readlink, 1141 .getattr = v9fs_vfs_getattr, 1142 .setattr = v9fs_vfs_setattr, 1143 }; 1144 1145 static struct inode_operations v9fs_dir_inode_operations = { 1146 .create = v9fs_vfs_create, 1147 .lookup = v9fs_vfs_lookup, 1148 .unlink = v9fs_vfs_unlink, 1149 .mkdir = v9fs_vfs_mkdir, 1150 .rmdir = v9fs_vfs_rmdir, 1151 .mknod = v9fs_vfs_mknod, 1152 .rename = v9fs_vfs_rename, 1153 .getattr = v9fs_vfs_getattr, 1154 .setattr = v9fs_vfs_setattr, 1155 }; 1156 1157 static struct inode_operations v9fs_file_inode_operations = { 1158 .getattr = v9fs_vfs_getattr, 1159 .setattr = v9fs_vfs_setattr, 1160 }; 1161 1162 static struct inode_operations v9fs_symlink_inode_operations = { 1163 .readlink = v9fs_vfs_readlink, 1164 .follow_link = v9fs_vfs_follow_link, 1165 .put_link = v9fs_vfs_put_link, 1166 .getattr = v9fs_vfs_getattr, 1167 .setattr = v9fs_vfs_setattr, 1168 }; 1169