1 /* 2 * Copyright (C) International Business Machines Corp., 2000-2004 3 * Portions Copyright (C) Christoph Hellwig, 2001-2002 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2 of the License, or 8 * (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 13 * the GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 18 */ 19 20 #include <linux/fs.h> 21 #include <linux/ctype.h> 22 #include <linux/quotaops.h> 23 #include "jfs_incore.h" 24 #include "jfs_superblock.h" 25 #include "jfs_inode.h" 26 #include "jfs_dinode.h" 27 #include "jfs_dmap.h" 28 #include "jfs_unicode.h" 29 #include "jfs_metapage.h" 30 #include "jfs_xattr.h" 31 #include "jfs_acl.h" 32 #include "jfs_debug.h" 33 34 /* 35 * forward references 36 */ 37 struct dentry_operations jfs_ci_dentry_operations; 38 39 static s64 commitZeroLink(tid_t, struct inode *); 40 41 /* 42 * NAME: free_ea_wmap(inode) 43 * 44 * FUNCTION: free uncommitted extended attributes from working map 45 * 46 */ 47 static inline void free_ea_wmap(struct inode *inode) 48 { 49 dxd_t *ea = &JFS_IP(inode)->ea; 50 51 if (ea->flag & DXD_EXTENT) { 52 /* free EA pages from cache */ 53 invalidate_dxd_metapages(inode, *ea); 54 dbFree(inode, addressDXD(ea), lengthDXD(ea)); 55 } 56 ea->flag = 0; 57 } 58 59 /* 60 * NAME: jfs_create(dip, dentry, mode) 61 * 62 * FUNCTION: create a regular file in the parent directory <dip> 63 * with name = <from dentry> and mode = <mode> 64 * 65 * PARAMETER: dip - parent directory vnode 66 * dentry - dentry of new file 67 * mode - create mode (rwxrwxrwx). 68 * nd- nd struct 69 * 70 * RETURN: Errors from subroutines 71 * 72 */ 73 static int jfs_create(struct inode *dip, struct dentry *dentry, int mode, 74 struct nameidata *nd) 75 { 76 int rc = 0; 77 tid_t tid; /* transaction id */ 78 struct inode *ip = NULL; /* child directory inode */ 79 ino_t ino; 80 struct component_name dname; /* child directory name */ 81 struct btstack btstack; 82 struct inode *iplist[2]; 83 struct tblock *tblk; 84 85 jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name); 86 87 /* 88 * search parent directory for entry/freespace 89 * (dtSearch() returns parent directory page pinned) 90 */ 91 if ((rc = get_UCSname(&dname, dentry))) 92 goto out1; 93 94 /* 95 * Either iAlloc() or txBegin() may block. Deadlock can occur if we 96 * block there while holding dtree page, so we allocate the inode & 97 * begin the transaction before we search the directory. 98 */ 99 ip = ialloc(dip, mode); 100 if (ip == NULL) { 101 rc = -ENOSPC; 102 goto out2; 103 } 104 105 tid = txBegin(dip->i_sb, 0); 106 107 mutex_lock(&JFS_IP(dip)->commit_mutex); 108 mutex_lock(&JFS_IP(ip)->commit_mutex); 109 110 rc = jfs_init_acl(tid, ip, dip); 111 if (rc) 112 goto out3; 113 114 rc = jfs_init_security(tid, ip, dip); 115 if (rc) { 116 txAbort(tid, 0); 117 goto out3; 118 } 119 120 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { 121 jfs_err("jfs_create: dtSearch returned %d", rc); 122 txAbort(tid, 0); 123 goto out3; 124 } 125 126 tblk = tid_to_tblock(tid); 127 tblk->xflag |= COMMIT_CREATE; 128 tblk->ino = ip->i_ino; 129 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 130 131 iplist[0] = dip; 132 iplist[1] = ip; 133 134 /* 135 * initialize the child XAD tree root in-line in inode 136 */ 137 xtInitRoot(tid, ip); 138 139 /* 140 * create entry in parent directory for child directory 141 * (dtInsert() releases parent directory page) 142 */ 143 ino = ip->i_ino; 144 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { 145 if (rc == -EIO) { 146 jfs_err("jfs_create: dtInsert returned -EIO"); 147 txAbort(tid, 1); /* Marks Filesystem dirty */ 148 } else 149 txAbort(tid, 0); /* Filesystem full */ 150 goto out3; 151 } 152 153 ip->i_op = &jfs_file_inode_operations; 154 ip->i_fop = &jfs_file_operations; 155 ip->i_mapping->a_ops = &jfs_aops; 156 157 insert_inode_hash(ip); 158 mark_inode_dirty(ip); 159 160 dip->i_ctime = dip->i_mtime = CURRENT_TIME; 161 162 mark_inode_dirty(dip); 163 164 rc = txCommit(tid, 2, &iplist[0], 0); 165 166 out3: 167 txEnd(tid); 168 mutex_unlock(&JFS_IP(ip)->commit_mutex); 169 mutex_unlock(&JFS_IP(dip)->commit_mutex); 170 if (rc) { 171 free_ea_wmap(ip); 172 ip->i_nlink = 0; 173 iput(ip); 174 } else 175 d_instantiate(dentry, ip); 176 177 out2: 178 free_UCSname(&dname); 179 180 out1: 181 182 jfs_info("jfs_create: rc:%d", rc); 183 return rc; 184 } 185 186 187 /* 188 * NAME: jfs_mkdir(dip, dentry, mode) 189 * 190 * FUNCTION: create a child directory in the parent directory <dip> 191 * with name = <from dentry> and mode = <mode> 192 * 193 * PARAMETER: dip - parent directory vnode 194 * dentry - dentry of child directory 195 * mode - create mode (rwxrwxrwx). 196 * 197 * RETURN: Errors from subroutines 198 * 199 * note: 200 * EACCESS: user needs search+write permission on the parent directory 201 */ 202 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode) 203 { 204 int rc = 0; 205 tid_t tid; /* transaction id */ 206 struct inode *ip = NULL; /* child directory inode */ 207 ino_t ino; 208 struct component_name dname; /* child directory name */ 209 struct btstack btstack; 210 struct inode *iplist[2]; 211 struct tblock *tblk; 212 213 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name); 214 215 /* link count overflow on parent directory ? */ 216 if (dip->i_nlink == JFS_LINK_MAX) { 217 rc = -EMLINK; 218 goto out1; 219 } 220 221 /* 222 * search parent directory for entry/freespace 223 * (dtSearch() returns parent directory page pinned) 224 */ 225 if ((rc = get_UCSname(&dname, dentry))) 226 goto out1; 227 228 /* 229 * Either iAlloc() or txBegin() may block. Deadlock can occur if we 230 * block there while holding dtree page, so we allocate the inode & 231 * begin the transaction before we search the directory. 232 */ 233 ip = ialloc(dip, S_IFDIR | mode); 234 if (ip == NULL) { 235 rc = -ENOSPC; 236 goto out2; 237 } 238 239 tid = txBegin(dip->i_sb, 0); 240 241 mutex_lock(&JFS_IP(dip)->commit_mutex); 242 mutex_lock(&JFS_IP(ip)->commit_mutex); 243 244 rc = jfs_init_acl(tid, ip, dip); 245 if (rc) 246 goto out3; 247 248 rc = jfs_init_security(tid, ip, dip); 249 if (rc) { 250 txAbort(tid, 0); 251 goto out3; 252 } 253 254 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { 255 jfs_err("jfs_mkdir: dtSearch returned %d", rc); 256 txAbort(tid, 0); 257 goto out3; 258 } 259 260 tblk = tid_to_tblock(tid); 261 tblk->xflag |= COMMIT_CREATE; 262 tblk->ino = ip->i_ino; 263 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 264 265 iplist[0] = dip; 266 iplist[1] = ip; 267 268 /* 269 * initialize the child directory in-line in inode 270 */ 271 dtInitRoot(tid, ip, dip->i_ino); 272 273 /* 274 * create entry in parent directory for child directory 275 * (dtInsert() releases parent directory page) 276 */ 277 ino = ip->i_ino; 278 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { 279 if (rc == -EIO) { 280 jfs_err("jfs_mkdir: dtInsert returned -EIO"); 281 txAbort(tid, 1); /* Marks Filesystem dirty */ 282 } else 283 txAbort(tid, 0); /* Filesystem full */ 284 goto out3; 285 } 286 287 ip->i_nlink = 2; /* for '.' */ 288 ip->i_op = &jfs_dir_inode_operations; 289 ip->i_fop = &jfs_dir_operations; 290 291 insert_inode_hash(ip); 292 mark_inode_dirty(ip); 293 294 /* update parent directory inode */ 295 dip->i_nlink++; /* for '..' from child directory */ 296 dip->i_ctime = dip->i_mtime = CURRENT_TIME; 297 mark_inode_dirty(dip); 298 299 rc = txCommit(tid, 2, &iplist[0], 0); 300 301 out3: 302 txEnd(tid); 303 mutex_unlock(&JFS_IP(ip)->commit_mutex); 304 mutex_unlock(&JFS_IP(dip)->commit_mutex); 305 if (rc) { 306 free_ea_wmap(ip); 307 ip->i_nlink = 0; 308 iput(ip); 309 } else 310 d_instantiate(dentry, ip); 311 312 out2: 313 free_UCSname(&dname); 314 315 316 out1: 317 318 jfs_info("jfs_mkdir: rc:%d", rc); 319 return rc; 320 } 321 322 /* 323 * NAME: jfs_rmdir(dip, dentry) 324 * 325 * FUNCTION: remove a link to child directory 326 * 327 * PARAMETER: dip - parent inode 328 * dentry - child directory dentry 329 * 330 * RETURN: -EINVAL - if name is . or .. 331 * -EINVAL - if . or .. exist but are invalid. 332 * errors from subroutines 333 * 334 * note: 335 * if other threads have the directory open when the last link 336 * is removed, the "." and ".." entries, if present, are removed before 337 * rmdir() returns and no new entries may be created in the directory, 338 * but the directory is not removed until the last reference to 339 * the directory is released (cf.unlink() of regular file). 340 */ 341 static int jfs_rmdir(struct inode *dip, struct dentry *dentry) 342 { 343 int rc; 344 tid_t tid; /* transaction id */ 345 struct inode *ip = dentry->d_inode; 346 ino_t ino; 347 struct component_name dname; 348 struct inode *iplist[2]; 349 struct tblock *tblk; 350 351 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name); 352 353 /* Init inode for quota operations. */ 354 DQUOT_INIT(ip); 355 356 /* directory must be empty to be removed */ 357 if (!dtEmpty(ip)) { 358 rc = -ENOTEMPTY; 359 goto out; 360 } 361 362 if ((rc = get_UCSname(&dname, dentry))) { 363 goto out; 364 } 365 366 tid = txBegin(dip->i_sb, 0); 367 368 mutex_lock(&JFS_IP(dip)->commit_mutex); 369 mutex_lock(&JFS_IP(ip)->commit_mutex); 370 371 iplist[0] = dip; 372 iplist[1] = ip; 373 374 tblk = tid_to_tblock(tid); 375 tblk->xflag |= COMMIT_DELETE; 376 tblk->u.ip = ip; 377 378 /* 379 * delete the entry of target directory from parent directory 380 */ 381 ino = ip->i_ino; 382 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { 383 jfs_err("jfs_rmdir: dtDelete returned %d", rc); 384 if (rc == -EIO) 385 txAbort(tid, 1); 386 txEnd(tid); 387 mutex_unlock(&JFS_IP(ip)->commit_mutex); 388 mutex_unlock(&JFS_IP(dip)->commit_mutex); 389 390 goto out2; 391 } 392 393 /* update parent directory's link count corresponding 394 * to ".." entry of the target directory deleted 395 */ 396 dip->i_nlink--; 397 dip->i_ctime = dip->i_mtime = CURRENT_TIME; 398 mark_inode_dirty(dip); 399 400 /* 401 * OS/2 could have created EA and/or ACL 402 */ 403 /* free EA from both persistent and working map */ 404 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { 405 /* free EA pages */ 406 txEA(tid, ip, &JFS_IP(ip)->ea, NULL); 407 } 408 JFS_IP(ip)->ea.flag = 0; 409 410 /* free ACL from both persistent and working map */ 411 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { 412 /* free ACL pages */ 413 txEA(tid, ip, &JFS_IP(ip)->acl, NULL); 414 } 415 JFS_IP(ip)->acl.flag = 0; 416 417 /* mark the target directory as deleted */ 418 ip->i_nlink = 0; 419 mark_inode_dirty(ip); 420 421 rc = txCommit(tid, 2, &iplist[0], 0); 422 423 txEnd(tid); 424 425 mutex_unlock(&JFS_IP(ip)->commit_mutex); 426 mutex_unlock(&JFS_IP(dip)->commit_mutex); 427 428 /* 429 * Truncating the directory index table is not guaranteed. It 430 * may need to be done iteratively 431 */ 432 if (test_cflag(COMMIT_Stale, dip)) { 433 if (dip->i_size > 1) 434 jfs_truncate_nolock(dip, 0); 435 436 clear_cflag(COMMIT_Stale, dip); 437 } 438 439 out2: 440 free_UCSname(&dname); 441 442 out: 443 jfs_info("jfs_rmdir: rc:%d", rc); 444 return rc; 445 } 446 447 /* 448 * NAME: jfs_unlink(dip, dentry) 449 * 450 * FUNCTION: remove a link to object <vp> named by <name> 451 * from parent directory <dvp> 452 * 453 * PARAMETER: dip - inode of parent directory 454 * dentry - dentry of object to be removed 455 * 456 * RETURN: errors from subroutines 457 * 458 * note: 459 * temporary file: if one or more processes have the file open 460 * when the last link is removed, the link will be removed before 461 * unlink() returns, but the removal of the file contents will be 462 * postponed until all references to the files are closed. 463 * 464 * JFS does NOT support unlink() on directories. 465 * 466 */ 467 static int jfs_unlink(struct inode *dip, struct dentry *dentry) 468 { 469 int rc; 470 tid_t tid; /* transaction id */ 471 struct inode *ip = dentry->d_inode; 472 ino_t ino; 473 struct component_name dname; /* object name */ 474 struct inode *iplist[2]; 475 struct tblock *tblk; 476 s64 new_size = 0; 477 int commit_flag; 478 479 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name); 480 481 /* Init inode for quota operations. */ 482 DQUOT_INIT(ip); 483 484 if ((rc = get_UCSname(&dname, dentry))) 485 goto out; 486 487 IWRITE_LOCK(ip); 488 489 tid = txBegin(dip->i_sb, 0); 490 491 mutex_lock(&JFS_IP(dip)->commit_mutex); 492 mutex_lock(&JFS_IP(ip)->commit_mutex); 493 494 iplist[0] = dip; 495 iplist[1] = ip; 496 497 /* 498 * delete the entry of target file from parent directory 499 */ 500 ino = ip->i_ino; 501 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { 502 jfs_err("jfs_unlink: dtDelete returned %d", rc); 503 if (rc == -EIO) 504 txAbort(tid, 1); /* Marks FS Dirty */ 505 txEnd(tid); 506 mutex_unlock(&JFS_IP(ip)->commit_mutex); 507 mutex_unlock(&JFS_IP(dip)->commit_mutex); 508 IWRITE_UNLOCK(ip); 509 goto out1; 510 } 511 512 ASSERT(ip->i_nlink); 513 514 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME; 515 mark_inode_dirty(dip); 516 517 /* update target's inode */ 518 ip->i_nlink--; 519 mark_inode_dirty(ip); 520 521 /* 522 * commit zero link count object 523 */ 524 if (ip->i_nlink == 0) { 525 assert(!test_cflag(COMMIT_Nolink, ip)); 526 /* free block resources */ 527 if ((new_size = commitZeroLink(tid, ip)) < 0) { 528 txAbort(tid, 1); /* Marks FS Dirty */ 529 txEnd(tid); 530 mutex_unlock(&JFS_IP(ip)->commit_mutex); 531 mutex_unlock(&JFS_IP(dip)->commit_mutex); 532 IWRITE_UNLOCK(ip); 533 rc = new_size; 534 goto out1; 535 } 536 tblk = tid_to_tblock(tid); 537 tblk->xflag |= COMMIT_DELETE; 538 tblk->u.ip = ip; 539 } 540 541 /* 542 * Incomplete truncate of file data can 543 * result in timing problems unless we synchronously commit the 544 * transaction. 545 */ 546 if (new_size) 547 commit_flag = COMMIT_SYNC; 548 else 549 commit_flag = 0; 550 551 /* 552 * If xtTruncate was incomplete, commit synchronously to avoid 553 * timing complications 554 */ 555 rc = txCommit(tid, 2, &iplist[0], commit_flag); 556 557 txEnd(tid); 558 559 mutex_unlock(&JFS_IP(ip)->commit_mutex); 560 mutex_unlock(&JFS_IP(dip)->commit_mutex); 561 562 while (new_size && (rc == 0)) { 563 tid = txBegin(dip->i_sb, 0); 564 mutex_lock(&JFS_IP(ip)->commit_mutex); 565 new_size = xtTruncate_pmap(tid, ip, new_size); 566 if (new_size < 0) { 567 txAbort(tid, 1); /* Marks FS Dirty */ 568 rc = new_size; 569 } else 570 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); 571 txEnd(tid); 572 mutex_unlock(&JFS_IP(ip)->commit_mutex); 573 } 574 575 if (ip->i_nlink == 0) 576 set_cflag(COMMIT_Nolink, ip); 577 578 IWRITE_UNLOCK(ip); 579 580 /* 581 * Truncating the directory index table is not guaranteed. It 582 * may need to be done iteratively 583 */ 584 if (test_cflag(COMMIT_Stale, dip)) { 585 if (dip->i_size > 1) 586 jfs_truncate_nolock(dip, 0); 587 588 clear_cflag(COMMIT_Stale, dip); 589 } 590 591 out1: 592 free_UCSname(&dname); 593 out: 594 jfs_info("jfs_unlink: rc:%d", rc); 595 return rc; 596 } 597 598 /* 599 * NAME: commitZeroLink() 600 * 601 * FUNCTION: for non-directory, called by jfs_remove(), 602 * truncate a regular file, directory or symbolic 603 * link to zero length. return 0 if type is not 604 * one of these. 605 * 606 * if the file is currently associated with a VM segment 607 * only permanent disk and inode map resources are freed, 608 * and neither the inode nor indirect blocks are modified 609 * so that the resources can be later freed in the work 610 * map by ctrunc1. 611 * if there is no VM segment on entry, the resources are 612 * freed in both work and permanent map. 613 * (? for temporary file - memory object is cached even 614 * after no reference: 615 * reference count > 0 - ) 616 * 617 * PARAMETERS: cd - pointer to commit data structure. 618 * current inode is the one to truncate. 619 * 620 * RETURN: Errors from subroutines 621 */ 622 static s64 commitZeroLink(tid_t tid, struct inode *ip) 623 { 624 int filetype; 625 struct tblock *tblk; 626 627 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); 628 629 filetype = ip->i_mode & S_IFMT; 630 switch (filetype) { 631 case S_IFREG: 632 break; 633 case S_IFLNK: 634 /* fast symbolic link */ 635 if (ip->i_size < IDATASIZE) { 636 ip->i_size = 0; 637 return 0; 638 } 639 break; 640 default: 641 assert(filetype != S_IFDIR); 642 return 0; 643 } 644 645 set_cflag(COMMIT_Freewmap, ip); 646 647 /* mark transaction of block map update type */ 648 tblk = tid_to_tblock(tid); 649 tblk->xflag |= COMMIT_PMAP; 650 651 /* 652 * free EA 653 */ 654 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) 655 /* acquire maplock on EA to be freed from block map */ 656 txEA(tid, ip, &JFS_IP(ip)->ea, NULL); 657 658 /* 659 * free ACL 660 */ 661 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) 662 /* acquire maplock on EA to be freed from block map */ 663 txEA(tid, ip, &JFS_IP(ip)->acl, NULL); 664 665 /* 666 * free xtree/data (truncate to zero length): 667 * free xtree/data pages from cache if COMMIT_PWMAP, 668 * free xtree/data blocks from persistent block map, and 669 * free xtree/data blocks from working block map if COMMIT_PWMAP; 670 */ 671 if (ip->i_size) 672 return xtTruncate_pmap(tid, ip, 0); 673 674 return 0; 675 } 676 677 678 /* 679 * NAME: jfs_free_zero_link() 680 * 681 * FUNCTION: for non-directory, called by iClose(), 682 * free resources of a file from cache and WORKING map 683 * for a file previously committed with zero link count 684 * while associated with a pager object, 685 * 686 * PARAMETER: ip - pointer to inode of file. 687 */ 688 void jfs_free_zero_link(struct inode *ip) 689 { 690 int type; 691 692 jfs_info("jfs_free_zero_link: ip = 0x%p", ip); 693 694 /* return if not reg or symbolic link or if size is 695 * already ok. 696 */ 697 type = ip->i_mode & S_IFMT; 698 699 switch (type) { 700 case S_IFREG: 701 break; 702 case S_IFLNK: 703 /* if its contained in inode nothing to do */ 704 if (ip->i_size < IDATASIZE) 705 return; 706 break; 707 default: 708 return; 709 } 710 711 /* 712 * free EA 713 */ 714 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { 715 s64 xaddr = addressDXD(&JFS_IP(ip)->ea); 716 int xlen = lengthDXD(&JFS_IP(ip)->ea); 717 struct maplock maplock; /* maplock for COMMIT_WMAP */ 718 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ 719 720 /* free EA pages from cache */ 721 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); 722 723 /* free EA extent from working block map */ 724 maplock.index = 1; 725 pxdlock = (struct pxd_lock *) & maplock; 726 pxdlock->flag = mlckFREEPXD; 727 PXDaddress(&pxdlock->pxd, xaddr); 728 PXDlength(&pxdlock->pxd, xlen); 729 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); 730 } 731 732 /* 733 * free ACL 734 */ 735 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { 736 s64 xaddr = addressDXD(&JFS_IP(ip)->acl); 737 int xlen = lengthDXD(&JFS_IP(ip)->acl); 738 struct maplock maplock; /* maplock for COMMIT_WMAP */ 739 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ 740 741 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); 742 743 /* free ACL extent from working block map */ 744 maplock.index = 1; 745 pxdlock = (struct pxd_lock *) & maplock; 746 pxdlock->flag = mlckFREEPXD; 747 PXDaddress(&pxdlock->pxd, xaddr); 748 PXDlength(&pxdlock->pxd, xlen); 749 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); 750 } 751 752 /* 753 * free xtree/data (truncate to zero length): 754 * free xtree/data pages from cache, and 755 * free xtree/data blocks from working block map; 756 */ 757 if (ip->i_size) 758 xtTruncate(0, ip, 0, COMMIT_WMAP); 759 } 760 761 /* 762 * NAME: jfs_link(vp, dvp, name, crp) 763 * 764 * FUNCTION: create a link to <vp> by the name = <name> 765 * in the parent directory <dvp> 766 * 767 * PARAMETER: vp - target object 768 * dvp - parent directory of new link 769 * name - name of new link to target object 770 * crp - credential 771 * 772 * RETURN: Errors from subroutines 773 * 774 * note: 775 * JFS does NOT support link() on directories (to prevent circular 776 * path in the directory hierarchy); 777 * EPERM: the target object is a directory, and either the caller 778 * does not have appropriate privileges or the implementation prohibits 779 * using link() on directories [XPG4.2]. 780 * 781 * JFS does NOT support links between file systems: 782 * EXDEV: target object and new link are on different file systems and 783 * implementation does not support links between file systems [XPG4.2]. 784 */ 785 static int jfs_link(struct dentry *old_dentry, 786 struct inode *dir, struct dentry *dentry) 787 { 788 int rc; 789 tid_t tid; 790 struct inode *ip = old_dentry->d_inode; 791 ino_t ino; 792 struct component_name dname; 793 struct btstack btstack; 794 struct inode *iplist[2]; 795 796 jfs_info("jfs_link: %s %s", old_dentry->d_name.name, 797 dentry->d_name.name); 798 799 if (ip->i_nlink == JFS_LINK_MAX) 800 return -EMLINK; 801 802 if (ip->i_nlink == 0) 803 return -ENOENT; 804 805 tid = txBegin(ip->i_sb, 0); 806 807 mutex_lock(&JFS_IP(dir)->commit_mutex); 808 mutex_lock(&JFS_IP(ip)->commit_mutex); 809 810 /* 811 * scan parent directory for entry/freespace 812 */ 813 if ((rc = get_UCSname(&dname, dentry))) 814 goto out; 815 816 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) 817 goto free_dname; 818 819 /* 820 * create entry for new link in parent directory 821 */ 822 ino = ip->i_ino; 823 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) 824 goto free_dname; 825 826 /* update object inode */ 827 ip->i_nlink++; /* for new link */ 828 ip->i_ctime = CURRENT_TIME; 829 dir->i_ctime = dir->i_mtime = CURRENT_TIME; 830 mark_inode_dirty(dir); 831 atomic_inc(&ip->i_count); 832 833 iplist[0] = ip; 834 iplist[1] = dir; 835 rc = txCommit(tid, 2, &iplist[0], 0); 836 837 if (rc) { 838 ip->i_nlink--; 839 iput(ip); 840 } else 841 d_instantiate(dentry, ip); 842 843 free_dname: 844 free_UCSname(&dname); 845 846 out: 847 txEnd(tid); 848 849 mutex_unlock(&JFS_IP(ip)->commit_mutex); 850 mutex_unlock(&JFS_IP(dir)->commit_mutex); 851 852 jfs_info("jfs_link: rc:%d", rc); 853 return rc; 854 } 855 856 /* 857 * NAME: jfs_symlink(dip, dentry, name) 858 * 859 * FUNCTION: creates a symbolic link to <symlink> by name <name> 860 * in directory <dip> 861 * 862 * PARAMETER: dip - parent directory vnode 863 * dentry - dentry of symbolic link 864 * name - the path name of the existing object 865 * that will be the source of the link 866 * 867 * RETURN: errors from subroutines 868 * 869 * note: 870 * ENAMETOOLONG: pathname resolution of a symbolic link produced 871 * an intermediate result whose length exceeds PATH_MAX [XPG4.2] 872 */ 873 874 static int jfs_symlink(struct inode *dip, struct dentry *dentry, 875 const char *name) 876 { 877 int rc; 878 tid_t tid; 879 ino_t ino = 0; 880 struct component_name dname; 881 int ssize; /* source pathname size */ 882 struct btstack btstack; 883 struct inode *ip = dentry->d_inode; 884 unchar *i_fastsymlink; 885 s64 xlen = 0; 886 int bmask = 0, xsize; 887 s64 extent = 0, xaddr; 888 struct metapage *mp; 889 struct super_block *sb; 890 struct tblock *tblk; 891 892 struct inode *iplist[2]; 893 894 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); 895 896 ssize = strlen(name) + 1; 897 898 /* 899 * search parent directory for entry/freespace 900 * (dtSearch() returns parent directory page pinned) 901 */ 902 903 if ((rc = get_UCSname(&dname, dentry))) 904 goto out1; 905 906 /* 907 * allocate on-disk/in-memory inode for symbolic link: 908 * (iAlloc() returns new, locked inode) 909 */ 910 ip = ialloc(dip, S_IFLNK | 0777); 911 if (ip == NULL) { 912 rc = -ENOSPC; 913 goto out2; 914 } 915 916 tid = txBegin(dip->i_sb, 0); 917 918 mutex_lock(&JFS_IP(dip)->commit_mutex); 919 mutex_lock(&JFS_IP(ip)->commit_mutex); 920 921 rc = jfs_init_security(tid, ip, dip); 922 if (rc) 923 goto out3; 924 925 tblk = tid_to_tblock(tid); 926 tblk->xflag |= COMMIT_CREATE; 927 tblk->ino = ip->i_ino; 928 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 929 930 /* fix symlink access permission 931 * (dir_create() ANDs in the u.u_cmask, 932 * but symlinks really need to be 777 access) 933 */ 934 ip->i_mode |= 0777; 935 936 /* 937 * write symbolic link target path name 938 */ 939 xtInitRoot(tid, ip); 940 941 /* 942 * write source path name inline in on-disk inode (fast symbolic link) 943 */ 944 945 if (ssize <= IDATASIZE) { 946 ip->i_op = &jfs_symlink_inode_operations; 947 948 i_fastsymlink = JFS_IP(ip)->i_inline; 949 memcpy(i_fastsymlink, name, ssize); 950 ip->i_size = ssize - 1; 951 952 /* 953 * if symlink is > 128 bytes, we don't have the space to 954 * store inline extended attributes 955 */ 956 if (ssize > sizeof (JFS_IP(ip)->i_inline)) 957 JFS_IP(ip)->mode2 &= ~INLINEEA; 958 959 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", 960 ssize, name); 961 } 962 /* 963 * write source path name in a single extent 964 */ 965 else { 966 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); 967 968 ip->i_op = &page_symlink_inode_operations; 969 ip->i_mapping->a_ops = &jfs_aops; 970 971 /* 972 * even though the data of symlink object (source 973 * path name) is treated as non-journaled user data, 974 * it is read/written thru buffer cache for performance. 975 */ 976 sb = ip->i_sb; 977 bmask = JFS_SBI(sb)->bsize - 1; 978 xsize = (ssize + bmask) & ~bmask; 979 xaddr = 0; 980 xlen = xsize >> JFS_SBI(sb)->l2bsize; 981 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { 982 txAbort(tid, 0); 983 rc = -ENOSPC; 984 goto out3; 985 } 986 extent = xaddr; 987 ip->i_size = ssize - 1; 988 while (ssize) { 989 /* This is kind of silly since PATH_MAX == 4K */ 990 int copy_size = min(ssize, PSIZE); 991 992 mp = get_metapage(ip, xaddr, PSIZE, 1); 993 994 if (mp == NULL) { 995 xtTruncate(tid, ip, 0, COMMIT_PWMAP); 996 rc = -EIO; 997 txAbort(tid, 0); 998 goto out3; 999 } 1000 memcpy(mp->data, name, copy_size); 1001 flush_metapage(mp); 1002 ssize -= copy_size; 1003 name += copy_size; 1004 xaddr += JFS_SBI(sb)->nbperpage; 1005 } 1006 } 1007 1008 /* 1009 * create entry for symbolic link in parent directory 1010 */ 1011 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); 1012 if (rc == 0) { 1013 ino = ip->i_ino; 1014 rc = dtInsert(tid, dip, &dname, &ino, &btstack); 1015 } 1016 if (rc) { 1017 if (xlen) 1018 xtTruncate(tid, ip, 0, COMMIT_PWMAP); 1019 txAbort(tid, 0); 1020 /* discard new inode */ 1021 goto out3; 1022 } 1023 1024 insert_inode_hash(ip); 1025 mark_inode_dirty(ip); 1026 1027 dip->i_ctime = dip->i_mtime = CURRENT_TIME; 1028 mark_inode_dirty(dip); 1029 /* 1030 * commit update of parent directory and link object 1031 */ 1032 1033 iplist[0] = dip; 1034 iplist[1] = ip; 1035 rc = txCommit(tid, 2, &iplist[0], 0); 1036 1037 out3: 1038 txEnd(tid); 1039 mutex_unlock(&JFS_IP(ip)->commit_mutex); 1040 mutex_unlock(&JFS_IP(dip)->commit_mutex); 1041 if (rc) { 1042 free_ea_wmap(ip); 1043 ip->i_nlink = 0; 1044 iput(ip); 1045 } else 1046 d_instantiate(dentry, ip); 1047 1048 out2: 1049 free_UCSname(&dname); 1050 1051 out1: 1052 jfs_info("jfs_symlink: rc:%d", rc); 1053 return rc; 1054 } 1055 1056 1057 /* 1058 * NAME: jfs_rename 1059 * 1060 * FUNCTION: rename a file or directory 1061 */ 1062 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, 1063 struct inode *new_dir, struct dentry *new_dentry) 1064 { 1065 struct btstack btstack; 1066 ino_t ino; 1067 struct component_name new_dname; 1068 struct inode *new_ip; 1069 struct component_name old_dname; 1070 struct inode *old_ip; 1071 int rc; 1072 tid_t tid; 1073 struct tlock *tlck; 1074 struct dt_lock *dtlck; 1075 struct lv *lv; 1076 int ipcount; 1077 struct inode *iplist[4]; 1078 struct tblock *tblk; 1079 s64 new_size = 0; 1080 int commit_flag; 1081 1082 1083 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name, 1084 new_dentry->d_name.name); 1085 1086 old_ip = old_dentry->d_inode; 1087 new_ip = new_dentry->d_inode; 1088 1089 if ((rc = get_UCSname(&old_dname, old_dentry))) 1090 goto out1; 1091 1092 if ((rc = get_UCSname(&new_dname, new_dentry))) 1093 goto out2; 1094 1095 /* 1096 * Make sure source inode number is what we think it is 1097 */ 1098 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); 1099 if (rc || (ino != old_ip->i_ino)) { 1100 rc = -ENOENT; 1101 goto out3; 1102 } 1103 1104 /* 1105 * Make sure dest inode number (if any) is what we think it is 1106 */ 1107 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); 1108 if (rc == 0) { 1109 if ((new_ip == 0) || (ino != new_ip->i_ino)) { 1110 rc = -ESTALE; 1111 goto out3; 1112 } 1113 } else if (rc != -ENOENT) 1114 goto out3; 1115 else if (new_ip) { 1116 /* no entry exists, but one was expected */ 1117 rc = -ESTALE; 1118 goto out3; 1119 } 1120 1121 if (S_ISDIR(old_ip->i_mode)) { 1122 if (new_ip) { 1123 if (!dtEmpty(new_ip)) { 1124 rc = -ENOTEMPTY; 1125 goto out3; 1126 } 1127 } else if ((new_dir != old_dir) && 1128 (new_dir->i_nlink == JFS_LINK_MAX)) { 1129 rc = -EMLINK; 1130 goto out3; 1131 } 1132 } else if (new_ip) { 1133 IWRITE_LOCK(new_ip); 1134 /* Init inode for quota operations. */ 1135 DQUOT_INIT(new_ip); 1136 } 1137 1138 /* 1139 * The real work starts here 1140 */ 1141 tid = txBegin(new_dir->i_sb, 0); 1142 1143 mutex_lock(&JFS_IP(new_dir)->commit_mutex); 1144 mutex_lock(&JFS_IP(old_ip)->commit_mutex); 1145 if (old_dir != new_dir) 1146 mutex_lock(&JFS_IP(old_dir)->commit_mutex); 1147 1148 if (new_ip) { 1149 mutex_lock(&JFS_IP(new_ip)->commit_mutex); 1150 /* 1151 * Change existing directory entry to new inode number 1152 */ 1153 ino = new_ip->i_ino; 1154 rc = dtModify(tid, new_dir, &new_dname, &ino, 1155 old_ip->i_ino, JFS_RENAME); 1156 if (rc) 1157 goto out4; 1158 new_ip->i_nlink--; 1159 if (S_ISDIR(new_ip->i_mode)) { 1160 new_ip->i_nlink--; 1161 if (new_ip->i_nlink) { 1162 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1163 if (old_dir != new_dir) 1164 mutex_unlock(&JFS_IP(old_dir)->commit_mutex); 1165 mutex_unlock(&JFS_IP(old_ip)->commit_mutex); 1166 mutex_unlock(&JFS_IP(new_dir)->commit_mutex); 1167 if (!S_ISDIR(old_ip->i_mode) && new_ip) 1168 IWRITE_UNLOCK(new_ip); 1169 jfs_error(new_ip->i_sb, 1170 "jfs_rename: new_ip->i_nlink != 0"); 1171 return -EIO; 1172 } 1173 tblk = tid_to_tblock(tid); 1174 tblk->xflag |= COMMIT_DELETE; 1175 tblk->u.ip = new_ip; 1176 } else if (new_ip->i_nlink == 0) { 1177 assert(!test_cflag(COMMIT_Nolink, new_ip)); 1178 /* free block resources */ 1179 if ((new_size = commitZeroLink(tid, new_ip)) < 0) { 1180 txAbort(tid, 1); /* Marks FS Dirty */ 1181 rc = new_size; 1182 goto out4; 1183 } 1184 tblk = tid_to_tblock(tid); 1185 tblk->xflag |= COMMIT_DELETE; 1186 tblk->u.ip = new_ip; 1187 } else { 1188 new_ip->i_ctime = CURRENT_TIME; 1189 mark_inode_dirty(new_ip); 1190 } 1191 } else { 1192 /* 1193 * Add new directory entry 1194 */ 1195 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, 1196 JFS_CREATE); 1197 if (rc) { 1198 jfs_err("jfs_rename didn't expect dtSearch to fail " 1199 "w/rc = %d", rc); 1200 goto out4; 1201 } 1202 1203 ino = old_ip->i_ino; 1204 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); 1205 if (rc) { 1206 if (rc == -EIO) 1207 jfs_err("jfs_rename: dtInsert returned -EIO"); 1208 goto out4; 1209 } 1210 if (S_ISDIR(old_ip->i_mode)) 1211 new_dir->i_nlink++; 1212 } 1213 /* 1214 * Remove old directory entry 1215 */ 1216 1217 ino = old_ip->i_ino; 1218 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); 1219 if (rc) { 1220 jfs_err("jfs_rename did not expect dtDelete to return rc = %d", 1221 rc); 1222 txAbort(tid, 1); /* Marks Filesystem dirty */ 1223 goto out4; 1224 } 1225 if (S_ISDIR(old_ip->i_mode)) { 1226 old_dir->i_nlink--; 1227 if (old_dir != new_dir) { 1228 /* 1229 * Change inode number of parent for moved directory 1230 */ 1231 1232 JFS_IP(old_ip)->i_dtroot.header.idotdot = 1233 cpu_to_le32(new_dir->i_ino); 1234 1235 /* Linelock header of dtree */ 1236 tlck = txLock(tid, old_ip, 1237 (struct metapage *) &JFS_IP(old_ip)->bxflag, 1238 tlckDTREE | tlckBTROOT | tlckRELINK); 1239 dtlck = (struct dt_lock *) & tlck->lock; 1240 ASSERT(dtlck->index == 0); 1241 lv = & dtlck->lv[0]; 1242 lv->offset = 0; 1243 lv->length = 1; 1244 dtlck->index++; 1245 } 1246 } 1247 1248 /* 1249 * Update ctime on changed/moved inodes & mark dirty 1250 */ 1251 old_ip->i_ctime = CURRENT_TIME; 1252 mark_inode_dirty(old_ip); 1253 1254 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); 1255 mark_inode_dirty(new_dir); 1256 1257 /* Build list of inodes modified by this transaction */ 1258 ipcount = 0; 1259 iplist[ipcount++] = old_ip; 1260 if (new_ip) 1261 iplist[ipcount++] = new_ip; 1262 iplist[ipcount++] = old_dir; 1263 1264 if (old_dir != new_dir) { 1265 iplist[ipcount++] = new_dir; 1266 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; 1267 mark_inode_dirty(old_dir); 1268 } 1269 1270 /* 1271 * Incomplete truncate of file data can 1272 * result in timing problems unless we synchronously commit the 1273 * transaction. 1274 */ 1275 if (new_size) 1276 commit_flag = COMMIT_SYNC; 1277 else 1278 commit_flag = 0; 1279 1280 rc = txCommit(tid, ipcount, iplist, commit_flag); 1281 1282 out4: 1283 txEnd(tid); 1284 if (new_ip) 1285 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1286 if (old_dir != new_dir) 1287 mutex_unlock(&JFS_IP(old_dir)->commit_mutex); 1288 mutex_unlock(&JFS_IP(old_ip)->commit_mutex); 1289 mutex_unlock(&JFS_IP(new_dir)->commit_mutex); 1290 1291 while (new_size && (rc == 0)) { 1292 tid = txBegin(new_ip->i_sb, 0); 1293 mutex_lock(&JFS_IP(new_ip)->commit_mutex); 1294 new_size = xtTruncate_pmap(tid, new_ip, new_size); 1295 if (new_size < 0) { 1296 txAbort(tid, 1); 1297 rc = new_size; 1298 } else 1299 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); 1300 txEnd(tid); 1301 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1302 } 1303 if (new_ip && (new_ip->i_nlink == 0)) 1304 set_cflag(COMMIT_Nolink, new_ip); 1305 out3: 1306 free_UCSname(&new_dname); 1307 out2: 1308 free_UCSname(&old_dname); 1309 out1: 1310 if (new_ip && !S_ISDIR(new_ip->i_mode)) 1311 IWRITE_UNLOCK(new_ip); 1312 /* 1313 * Truncating the directory index table is not guaranteed. It 1314 * may need to be done iteratively 1315 */ 1316 if (test_cflag(COMMIT_Stale, old_dir)) { 1317 if (old_dir->i_size > 1) 1318 jfs_truncate_nolock(old_dir, 0); 1319 1320 clear_cflag(COMMIT_Stale, old_dir); 1321 } 1322 1323 jfs_info("jfs_rename: returning %d", rc); 1324 return rc; 1325 } 1326 1327 1328 /* 1329 * NAME: jfs_mknod 1330 * 1331 * FUNCTION: Create a special file (device) 1332 */ 1333 static int jfs_mknod(struct inode *dir, struct dentry *dentry, 1334 int mode, dev_t rdev) 1335 { 1336 struct jfs_inode_info *jfs_ip; 1337 struct btstack btstack; 1338 struct component_name dname; 1339 ino_t ino; 1340 struct inode *ip; 1341 struct inode *iplist[2]; 1342 int rc; 1343 tid_t tid; 1344 struct tblock *tblk; 1345 1346 if (!new_valid_dev(rdev)) 1347 return -EINVAL; 1348 1349 jfs_info("jfs_mknod: %s", dentry->d_name.name); 1350 1351 if ((rc = get_UCSname(&dname, dentry))) 1352 goto out; 1353 1354 ip = ialloc(dir, mode); 1355 if (ip == NULL) { 1356 rc = -ENOSPC; 1357 goto out1; 1358 } 1359 jfs_ip = JFS_IP(ip); 1360 1361 tid = txBegin(dir->i_sb, 0); 1362 1363 mutex_lock(&JFS_IP(dir)->commit_mutex); 1364 mutex_lock(&JFS_IP(ip)->commit_mutex); 1365 1366 rc = jfs_init_acl(tid, ip, dir); 1367 if (rc) 1368 goto out3; 1369 1370 rc = jfs_init_security(tid, ip, dir); 1371 if (rc) { 1372 txAbort(tid, 0); 1373 goto out3; 1374 } 1375 1376 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { 1377 txAbort(tid, 0); 1378 goto out3; 1379 } 1380 1381 tblk = tid_to_tblock(tid); 1382 tblk->xflag |= COMMIT_CREATE; 1383 tblk->ino = ip->i_ino; 1384 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 1385 1386 ino = ip->i_ino; 1387 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { 1388 txAbort(tid, 0); 1389 goto out3; 1390 } 1391 1392 ip->i_op = &jfs_file_inode_operations; 1393 jfs_ip->dev = new_encode_dev(rdev); 1394 init_special_inode(ip, ip->i_mode, rdev); 1395 1396 insert_inode_hash(ip); 1397 mark_inode_dirty(ip); 1398 1399 dir->i_ctime = dir->i_mtime = CURRENT_TIME; 1400 1401 mark_inode_dirty(dir); 1402 1403 iplist[0] = dir; 1404 iplist[1] = ip; 1405 rc = txCommit(tid, 2, iplist, 0); 1406 1407 out3: 1408 txEnd(tid); 1409 mutex_unlock(&JFS_IP(ip)->commit_mutex); 1410 mutex_unlock(&JFS_IP(dir)->commit_mutex); 1411 if (rc) { 1412 free_ea_wmap(ip); 1413 ip->i_nlink = 0; 1414 iput(ip); 1415 } else 1416 d_instantiate(dentry, ip); 1417 1418 out1: 1419 free_UCSname(&dname); 1420 1421 out: 1422 jfs_info("jfs_mknod: returning %d", rc); 1423 return rc; 1424 } 1425 1426 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) 1427 { 1428 struct btstack btstack; 1429 ino_t inum; 1430 struct inode *ip; 1431 struct component_name key; 1432 const char *name = dentry->d_name.name; 1433 int len = dentry->d_name.len; 1434 int rc; 1435 1436 jfs_info("jfs_lookup: name = %s", name); 1437 1438 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2) 1439 dentry->d_op = &jfs_ci_dentry_operations; 1440 1441 if ((name[0] == '.') && (len == 1)) 1442 inum = dip->i_ino; 1443 else if (strcmp(name, "..") == 0) 1444 inum = PARENT(dip); 1445 else { 1446 if ((rc = get_UCSname(&key, dentry))) 1447 return ERR_PTR(rc); 1448 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); 1449 free_UCSname(&key); 1450 if (rc == -ENOENT) { 1451 d_add(dentry, NULL); 1452 return ERR_PTR(0); 1453 } else if (rc) { 1454 jfs_err("jfs_lookup: dtSearch returned %d", rc); 1455 return ERR_PTR(rc); 1456 } 1457 } 1458 1459 ip = iget(dip->i_sb, inum); 1460 if (ip == NULL || is_bad_inode(ip)) { 1461 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum); 1462 if (ip) 1463 iput(ip); 1464 return ERR_PTR(-EACCES); 1465 } 1466 1467 dentry = d_splice_alias(ip, dentry); 1468 1469 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)) 1470 dentry->d_op = &jfs_ci_dentry_operations; 1471 1472 return dentry; 1473 } 1474 1475 struct dentry *jfs_get_parent(struct dentry *dentry) 1476 { 1477 struct super_block *sb = dentry->d_inode->i_sb; 1478 struct dentry *parent = ERR_PTR(-ENOENT); 1479 struct inode *inode; 1480 unsigned long parent_ino; 1481 1482 parent_ino = 1483 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot); 1484 inode = iget(sb, parent_ino); 1485 if (inode) { 1486 if (is_bad_inode(inode)) { 1487 iput(inode); 1488 parent = ERR_PTR(-EACCES); 1489 } else { 1490 parent = d_alloc_anon(inode); 1491 if (!parent) { 1492 parent = ERR_PTR(-ENOMEM); 1493 iput(inode); 1494 } 1495 } 1496 } 1497 1498 return parent; 1499 } 1500 1501 struct inode_operations jfs_dir_inode_operations = { 1502 .create = jfs_create, 1503 .lookup = jfs_lookup, 1504 .link = jfs_link, 1505 .unlink = jfs_unlink, 1506 .symlink = jfs_symlink, 1507 .mkdir = jfs_mkdir, 1508 .rmdir = jfs_rmdir, 1509 .mknod = jfs_mknod, 1510 .rename = jfs_rename, 1511 .setxattr = jfs_setxattr, 1512 .getxattr = jfs_getxattr, 1513 .listxattr = jfs_listxattr, 1514 .removexattr = jfs_removexattr, 1515 #ifdef CONFIG_JFS_POSIX_ACL 1516 .setattr = jfs_setattr, 1517 .permission = jfs_permission, 1518 #endif 1519 }; 1520 1521 const struct file_operations jfs_dir_operations = { 1522 .read = generic_read_dir, 1523 .readdir = jfs_readdir, 1524 .fsync = jfs_fsync, 1525 .ioctl = jfs_ioctl, 1526 }; 1527 1528 static int jfs_ci_hash(struct dentry *dir, struct qstr *this) 1529 { 1530 unsigned long hash; 1531 int i; 1532 1533 hash = init_name_hash(); 1534 for (i=0; i < this->len; i++) 1535 hash = partial_name_hash(tolower(this->name[i]), hash); 1536 this->hash = end_name_hash(hash); 1537 1538 return 0; 1539 } 1540 1541 static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b) 1542 { 1543 int i, result = 1; 1544 1545 if (a->len != b->len) 1546 goto out; 1547 for (i=0; i < a->len; i++) { 1548 if (tolower(a->name[i]) != tolower(b->name[i])) 1549 goto out; 1550 } 1551 result = 0; 1552 1553 /* 1554 * We want creates to preserve case. A negative dentry, a, that 1555 * has a different case than b may cause a new entry to be created 1556 * with the wrong case. Since we can't tell if a comes from a negative 1557 * dentry, we blindly replace it with b. This should be harmless if 1558 * a is not a negative dentry. 1559 */ 1560 memcpy((unsigned char *)a->name, b->name, a->len); 1561 out: 1562 return result; 1563 } 1564 1565 struct dentry_operations jfs_ci_dentry_operations = 1566 { 1567 .d_hash = jfs_ci_hash, 1568 .d_compare = jfs_ci_compare, 1569 }; 1570