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