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 */ 37struct dentry_operations jfs_ci_dentry_operations; 38 39static 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 */ 47static 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 */ 73static 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 (IS_ERR(ip)) { 101 rc = PTR_ERR(ip); 102 goto out2; 103 } 104 105 tid = txBegin(dip->i_sb, 0); 106 107 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 108 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 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 */ 202static 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 (IS_ERR(ip)) { 235 rc = PTR_ERR(ip); 236 goto out2; 237 } 238 239 tid = txBegin(dip->i_sb, 0); 240 241 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 242 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 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 inc_nlink(dip); /* 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 */ 341static 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_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 369 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 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_ctime = dip->i_mtime = CURRENT_TIME; 397 inode_dec_link_count(dip); 398 399 /* 400 * OS/2 could have created EA and/or ACL 401 */ 402 /* free EA from both persistent and working map */ 403 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { 404 /* free EA pages */ 405 txEA(tid, ip, &JFS_IP(ip)->ea, NULL); 406 } 407 JFS_IP(ip)->ea.flag = 0; 408 409 /* free ACL from both persistent and working map */ 410 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { 411 /* free ACL pages */ 412 txEA(tid, ip, &JFS_IP(ip)->acl, NULL); 413 } 414 JFS_IP(ip)->acl.flag = 0; 415 416 /* mark the target directory as deleted */ 417 clear_nlink(ip); 418 mark_inode_dirty(ip); 419 420 rc = txCommit(tid, 2, &iplist[0], 0); 421 422 txEnd(tid); 423 424 mutex_unlock(&JFS_IP(ip)->commit_mutex); 425 mutex_unlock(&JFS_IP(dip)->commit_mutex); 426 427 /* 428 * Truncating the directory index table is not guaranteed. It 429 * may need to be done iteratively 430 */ 431 if (test_cflag(COMMIT_Stale, dip)) { 432 if (dip->i_size > 1) 433 jfs_truncate_nolock(dip, 0); 434 435 clear_cflag(COMMIT_Stale, dip); 436 } 437 438 out2: 439 free_UCSname(&dname); 440 441 out: 442 jfs_info("jfs_rmdir: rc:%d", rc); 443 return rc; 444} 445 446/* 447 * NAME: jfs_unlink(dip, dentry) 448 * 449 * FUNCTION: remove a link to object <vp> named by <name> 450 * from parent directory <dvp> 451 * 452 * PARAMETER: dip - inode of parent directory 453 * dentry - dentry of object to be removed 454 * 455 * RETURN: errors from subroutines 456 * 457 * note: 458 * temporary file: if one or more processes have the file open 459 * when the last link is removed, the link will be removed before 460 * unlink() returns, but the removal of the file contents will be 461 * postponed until all references to the files are closed. 462 * 463 * JFS does NOT support unlink() on directories. 464 * 465 */ 466static int jfs_unlink(struct inode *dip, struct dentry *dentry) 467{ 468 int rc; 469 tid_t tid; /* transaction id */ 470 struct inode *ip = dentry->d_inode; 471 ino_t ino; 472 struct component_name dname; /* object name */ 473 struct inode *iplist[2]; 474 struct tblock *tblk; 475 s64 new_size = 0; 476 int commit_flag; 477 478 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name); 479 480 /* Init inode for quota operations. */ 481 DQUOT_INIT(ip); 482 483 if ((rc = get_UCSname(&dname, dentry))) 484 goto out; 485 486 IWRITE_LOCK(ip, RDWRLOCK_NORMAL); 487 488 tid = txBegin(dip->i_sb, 0); 489 490 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 491 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 492 493 iplist[0] = dip; 494 iplist[1] = ip; 495 496 /* 497 * delete the entry of target file from parent directory 498 */ 499 ino = ip->i_ino; 500 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { 501 jfs_err("jfs_unlink: dtDelete returned %d", rc); 502 if (rc == -EIO) 503 txAbort(tid, 1); /* Marks FS Dirty */ 504 txEnd(tid); 505 mutex_unlock(&JFS_IP(ip)->commit_mutex); 506 mutex_unlock(&JFS_IP(dip)->commit_mutex); 507 IWRITE_UNLOCK(ip); 508 goto out1; 509 } 510 511 ASSERT(ip->i_nlink); 512 513 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME; 514 mark_inode_dirty(dip); 515 516 /* update target's inode */ 517 inode_dec_link_count(ip); 518 519 /* 520 * commit zero link count object 521 */ 522 if (ip->i_nlink == 0) { 523 assert(!test_cflag(COMMIT_Nolink, ip)); 524 /* free block resources */ 525 if ((new_size = commitZeroLink(tid, ip)) < 0) { 526 txAbort(tid, 1); /* Marks FS Dirty */ 527 txEnd(tid); 528 mutex_unlock(&JFS_IP(ip)->commit_mutex); 529 mutex_unlock(&JFS_IP(dip)->commit_mutex); 530 IWRITE_UNLOCK(ip); 531 rc = new_size; 532 goto out1; 533 } 534 tblk = tid_to_tblock(tid); 535 tblk->xflag |= COMMIT_DELETE; 536 tblk->u.ip = ip; 537 } 538 539 /* 540 * Incomplete truncate of file data can 541 * result in timing problems unless we synchronously commit the 542 * transaction. 543 */ 544 if (new_size) 545 commit_flag = COMMIT_SYNC; 546 else 547 commit_flag = 0; 548 549 /* 550 * If xtTruncate was incomplete, commit synchronously to avoid 551 * timing complications 552 */ 553 rc = txCommit(tid, 2, &iplist[0], commit_flag); 554 555 txEnd(tid); 556 557 mutex_unlock(&JFS_IP(ip)->commit_mutex); 558 mutex_unlock(&JFS_IP(dip)->commit_mutex); 559 560 while (new_size && (rc == 0)) { 561 tid = txBegin(dip->i_sb, 0); 562 mutex_lock(&JFS_IP(ip)->commit_mutex); 563 new_size = xtTruncate_pmap(tid, ip, new_size); 564 if (new_size < 0) { 565 txAbort(tid, 1); /* Marks FS Dirty */ 566 rc = new_size; 567 } else 568 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); 569 txEnd(tid); 570 mutex_unlock(&JFS_IP(ip)->commit_mutex); 571 } 572 573 if (ip->i_nlink == 0) 574 set_cflag(COMMIT_Nolink, ip); 575 576 IWRITE_UNLOCK(ip); 577 578 /* 579 * Truncating the directory index table is not guaranteed. It 580 * may need to be done iteratively 581 */ 582 if (test_cflag(COMMIT_Stale, dip)) { 583 if (dip->i_size > 1) 584 jfs_truncate_nolock(dip, 0); 585 586 clear_cflag(COMMIT_Stale, dip); 587 } 588 589 out1: 590 free_UCSname(&dname); 591 out: 592 jfs_info("jfs_unlink: rc:%d", rc); 593 return rc; 594} 595 596/* 597 * NAME: commitZeroLink() 598 * 599 * FUNCTION: for non-directory, called by jfs_remove(), 600 * truncate a regular file, directory or symbolic 601 * link to zero length. return 0 if type is not 602 * one of these. 603 * 604 * if the file is currently associated with a VM segment 605 * only permanent disk and inode map resources are freed, 606 * and neither the inode nor indirect blocks are modified 607 * so that the resources can be later freed in the work 608 * map by ctrunc1. 609 * if there is no VM segment on entry, the resources are 610 * freed in both work and permanent map. 611 * (? for temporary file - memory object is cached even 612 * after no reference: 613 * reference count > 0 - ) 614 * 615 * PARAMETERS: cd - pointer to commit data structure. 616 * current inode is the one to truncate. 617 * 618 * RETURN: Errors from subroutines 619 */ 620static s64 commitZeroLink(tid_t tid, struct inode *ip) 621{ 622 int filetype; 623 struct tblock *tblk; 624 625 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); 626 627 filetype = ip->i_mode & S_IFMT; 628 switch (filetype) { 629 case S_IFREG: 630 break; 631 case S_IFLNK: 632 /* fast symbolic link */ 633 if (ip->i_size < IDATASIZE) { 634 ip->i_size = 0; 635 return 0; 636 } 637 break; 638 default: 639 assert(filetype != S_IFDIR); 640 return 0; 641 } 642 643 set_cflag(COMMIT_Freewmap, ip); 644 645 /* mark transaction of block map update type */ 646 tblk = tid_to_tblock(tid); 647 tblk->xflag |= COMMIT_PMAP; 648 649 /* 650 * free EA 651 */ 652 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) 653 /* acquire maplock on EA to be freed from block map */ 654 txEA(tid, ip, &JFS_IP(ip)->ea, NULL); 655 656 /* 657 * free ACL 658 */ 659 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) 660 /* acquire maplock on EA to be freed from block map */ 661 txEA(tid, ip, &JFS_IP(ip)->acl, NULL); 662 663 /* 664 * free xtree/data (truncate to zero length): 665 * free xtree/data pages from cache if COMMIT_PWMAP, 666 * free xtree/data blocks from persistent block map, and 667 * free xtree/data blocks from working block map if COMMIT_PWMAP; 668 */ 669 if (ip->i_size) 670 return xtTruncate_pmap(tid, ip, 0); 671 672 return 0; 673} 674 675 676/* 677 * NAME: jfs_free_zero_link() 678 * 679 * FUNCTION: for non-directory, called by iClose(), 680 * free resources of a file from cache and WORKING map 681 * for a file previously committed with zero link count 682 * while associated with a pager object, 683 * 684 * PARAMETER: ip - pointer to inode of file. 685 */ 686void jfs_free_zero_link(struct inode *ip) 687{ 688 int type; 689 690 jfs_info("jfs_free_zero_link: ip = 0x%p", ip); 691 692 /* return if not reg or symbolic link or if size is 693 * already ok. 694 */ 695 type = ip->i_mode & S_IFMT; 696 697 switch (type) { 698 case S_IFREG: 699 break; 700 case S_IFLNK: 701 /* if its contained in inode nothing to do */ 702 if (ip->i_size < IDATASIZE) 703 return; 704 break; 705 default: 706 return; 707 } 708 709 /* 710 * free EA 711 */ 712 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { 713 s64 xaddr = addressDXD(&JFS_IP(ip)->ea); 714 int xlen = lengthDXD(&JFS_IP(ip)->ea); 715 struct maplock maplock; /* maplock for COMMIT_WMAP */ 716 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ 717 718 /* free EA pages from cache */ 719 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); 720 721 /* free EA extent from working block map */ 722 maplock.index = 1; 723 pxdlock = (struct pxd_lock *) & maplock; 724 pxdlock->flag = mlckFREEPXD; 725 PXDaddress(&pxdlock->pxd, xaddr); 726 PXDlength(&pxdlock->pxd, xlen); 727 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); 728 } 729 730 /* 731 * free ACL 732 */ 733 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { 734 s64 xaddr = addressDXD(&JFS_IP(ip)->acl); 735 int xlen = lengthDXD(&JFS_IP(ip)->acl); 736 struct maplock maplock; /* maplock for COMMIT_WMAP */ 737 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ 738 739 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); 740 741 /* free ACL extent from working block map */ 742 maplock.index = 1; 743 pxdlock = (struct pxd_lock *) & maplock; 744 pxdlock->flag = mlckFREEPXD; 745 PXDaddress(&pxdlock->pxd, xaddr); 746 PXDlength(&pxdlock->pxd, xlen); 747 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); 748 } 749 750 /* 751 * free xtree/data (truncate to zero length): 752 * free xtree/data pages from cache, and 753 * free xtree/data blocks from working block map; 754 */ 755 if (ip->i_size) 756 xtTruncate(0, ip, 0, COMMIT_WMAP); 757} 758 759/* 760 * NAME: jfs_link(vp, dvp, name, crp) 761 * 762 * FUNCTION: create a link to <vp> by the name = <name> 763 * in the parent directory <dvp> 764 * 765 * PARAMETER: vp - target object 766 * dvp - parent directory of new link 767 * name - name of new link to target object 768 * crp - credential 769 * 770 * RETURN: Errors from subroutines 771 * 772 * note: 773 * JFS does NOT support link() on directories (to prevent circular 774 * path in the directory hierarchy); 775 * EPERM: the target object is a directory, and either the caller 776 * does not have appropriate privileges or the implementation prohibits 777 * using link() on directories [XPG4.2]. 778 * 779 * JFS does NOT support links between file systems: 780 * EXDEV: target object and new link are on different file systems and 781 * implementation does not support links between file systems [XPG4.2]. 782 */ 783static int jfs_link(struct dentry *old_dentry, 784 struct inode *dir, struct dentry *dentry) 785{ 786 int rc; 787 tid_t tid; 788 struct inode *ip = old_dentry->d_inode; 789 ino_t ino; 790 struct component_name dname; 791 struct btstack btstack; 792 struct inode *iplist[2]; 793 794 jfs_info("jfs_link: %s %s", old_dentry->d_name.name, 795 dentry->d_name.name); 796 797 if (ip->i_nlink == JFS_LINK_MAX) 798 return -EMLINK; 799 800 if (ip->i_nlink == 0) 801 return -ENOENT; 802 803 tid = txBegin(ip->i_sb, 0); 804 805 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); 806 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 807 808 /* 809 * scan parent directory for entry/freespace 810 */ 811 if ((rc = get_UCSname(&dname, dentry))) 812 goto out; 813 814 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) 815 goto free_dname; 816 817 /* 818 * create entry for new link in parent directory 819 */ 820 ino = ip->i_ino; 821 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) 822 goto free_dname; 823 824 /* update object inode */ 825 inc_nlink(ip); /* for new link */ 826 ip->i_ctime = CURRENT_TIME; 827 dir->i_ctime = dir->i_mtime = CURRENT_TIME; 828 mark_inode_dirty(dir); 829 atomic_inc(&ip->i_count); 830 831 iplist[0] = ip; 832 iplist[1] = dir; 833 rc = txCommit(tid, 2, &iplist[0], 0); 834 835 if (rc) { 836 ip->i_nlink--; /* never instantiated */ 837 iput(ip); 838 } else 839 d_instantiate(dentry, ip); 840 841 free_dname: 842 free_UCSname(&dname); 843 844 out: 845 txEnd(tid); 846 847 mutex_unlock(&JFS_IP(ip)->commit_mutex); 848 mutex_unlock(&JFS_IP(dir)->commit_mutex); 849 850 jfs_info("jfs_link: rc:%d", rc); 851 return rc; 852} 853 854/* 855 * NAME: jfs_symlink(dip, dentry, name) 856 * 857 * FUNCTION: creates a symbolic link to <symlink> by name <name> 858 * in directory <dip> 859 * 860 * PARAMETER: dip - parent directory vnode 861 * dentry - dentry of symbolic link 862 * name - the path name of the existing object 863 * that will be the source of the link 864 * 865 * RETURN: errors from subroutines 866 * 867 * note: 868 * ENAMETOOLONG: pathname resolution of a symbolic link produced 869 * an intermediate result whose length exceeds PATH_MAX [XPG4.2] 870*/ 871 872static int jfs_symlink(struct inode *dip, struct dentry *dentry, 873 const char *name) 874{ 875 int rc; 876 tid_t tid; 877 ino_t ino = 0; 878 struct component_name dname; 879 int ssize; /* source pathname size */ 880 struct btstack btstack; 881 struct inode *ip = dentry->d_inode; 882 unchar *i_fastsymlink; 883 s64 xlen = 0; 884 int bmask = 0, xsize; 885 s64 extent = 0, xaddr; 886 struct metapage *mp; 887 struct super_block *sb; 888 struct tblock *tblk; 889 890 struct inode *iplist[2]; 891 892 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); 893 894 ssize = strlen(name) + 1; 895 896 /* 897 * search parent directory for entry/freespace 898 * (dtSearch() returns parent directory page pinned) 899 */ 900 901 if ((rc = get_UCSname(&dname, dentry))) 902 goto out1; 903 904 /* 905 * allocate on-disk/in-memory inode for symbolic link: 906 * (iAlloc() returns new, locked inode) 907 */ 908 ip = ialloc(dip, S_IFLNK | 0777); 909 if (IS_ERR(ip)) { 910 rc = PTR_ERR(ip); 911 goto out2; 912 } 913 914 tid = txBegin(dip->i_sb, 0); 915 916 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 917 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 918 919 rc = jfs_init_security(tid, ip, dip); 920 if (rc) 921 goto out3; 922 923 tblk = tid_to_tblock(tid); 924 tblk->xflag |= COMMIT_CREATE; 925 tblk->ino = ip->i_ino; 926 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 927 928 /* fix symlink access permission 929 * (dir_create() ANDs in the u.u_cmask, 930 * but symlinks really need to be 777 access) 931 */ 932 ip->i_mode |= 0777; 933 934 /* 935 * write symbolic link target path name 936 */ 937 xtInitRoot(tid, ip); 938 939 /* 940 * write source path name inline in on-disk inode (fast symbolic link) 941 */ 942 943 if (ssize <= IDATASIZE) { 944 ip->i_op = &jfs_symlink_inode_operations; 945 946 i_fastsymlink = JFS_IP(ip)->i_inline; 947 memcpy(i_fastsymlink, name, ssize); 948 ip->i_size = ssize - 1; 949 950 /* 951 * if symlink is > 128 bytes, we don't have the space to 952 * store inline extended attributes 953 */ 954 if (ssize > sizeof (JFS_IP(ip)->i_inline)) 955 JFS_IP(ip)->mode2 &= ~INLINEEA; 956 957 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", 958 ssize, name); 959 } 960 /* 961 * write source path name in a single extent 962 */ 963 else { 964 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); 965 966 ip->i_op = &page_symlink_inode_operations; 967 ip->i_mapping->a_ops = &jfs_aops; 968 969 /* 970 * even though the data of symlink object (source 971 * path name) is treated as non-journaled user data, 972 * it is read/written thru buffer cache for performance. 973 */ 974 sb = ip->i_sb; 975 bmask = JFS_SBI(sb)->bsize - 1; 976 xsize = (ssize + bmask) & ~bmask; 977 xaddr = 0; 978 xlen = xsize >> JFS_SBI(sb)->l2bsize; 979 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { 980 txAbort(tid, 0); 981 goto out3; 982 } 983 extent = xaddr; 984 ip->i_size = ssize - 1; 985 while (ssize) { 986 /* This is kind of silly since PATH_MAX == 4K */ 987 int copy_size = min(ssize, PSIZE); 988 989 mp = get_metapage(ip, xaddr, PSIZE, 1); 990 991 if (mp == NULL) { 992 xtTruncate(tid, ip, 0, COMMIT_PWMAP); 993 rc = -EIO; 994 txAbort(tid, 0); 995 goto out3; 996 } 997 memcpy(mp->data, name, copy_size); 998 flush_metapage(mp); 999 ssize -= copy_size; 1000 name += copy_size; 1001 xaddr += JFS_SBI(sb)->nbperpage; 1002 } 1003 } 1004 1005 /* 1006 * create entry for symbolic link in parent directory 1007 */ 1008 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); 1009 if (rc == 0) { 1010 ino = ip->i_ino; 1011 rc = dtInsert(tid, dip, &dname, &ino, &btstack); 1012 } 1013 if (rc) { 1014 if (xlen) 1015 xtTruncate(tid, ip, 0, COMMIT_PWMAP); 1016 txAbort(tid, 0); 1017 /* discard new inode */ 1018 goto out3; 1019 } 1020 1021 insert_inode_hash(ip); 1022 mark_inode_dirty(ip); 1023 1024 dip->i_ctime = dip->i_mtime = CURRENT_TIME; 1025 mark_inode_dirty(dip); 1026 /* 1027 * commit update of parent directory and link object 1028 */ 1029 1030 iplist[0] = dip; 1031 iplist[1] = ip; 1032 rc = txCommit(tid, 2, &iplist[0], 0); 1033 1034 out3: 1035 txEnd(tid); 1036 mutex_unlock(&JFS_IP(ip)->commit_mutex); 1037 mutex_unlock(&JFS_IP(dip)->commit_mutex); 1038 if (rc) { 1039 free_ea_wmap(ip); 1040 ip->i_nlink = 0; 1041 iput(ip); 1042 } else 1043 d_instantiate(dentry, ip); 1044 1045 out2: 1046 free_UCSname(&dname); 1047 1048 out1: 1049 jfs_info("jfs_symlink: rc:%d", rc); 1050 return rc; 1051} 1052 1053 1054/* 1055 * NAME: jfs_rename 1056 * 1057 * FUNCTION: rename a file or directory 1058 */ 1059static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, 1060 struct inode *new_dir, struct dentry *new_dentry) 1061{ 1062 struct btstack btstack; 1063 ino_t ino; 1064 struct component_name new_dname; 1065 struct inode *new_ip; 1066 struct component_name old_dname; 1067 struct inode *old_ip; 1068 int rc; 1069 tid_t tid; 1070 struct tlock *tlck; 1071 struct dt_lock *dtlck; 1072 struct lv *lv; 1073 int ipcount; 1074 struct inode *iplist[4]; 1075 struct tblock *tblk; 1076 s64 new_size = 0; 1077 int commit_flag; 1078 1079 1080 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name, 1081 new_dentry->d_name.name); 1082 1083 old_ip = old_dentry->d_inode; 1084 new_ip = new_dentry->d_inode; 1085 1086 if ((rc = get_UCSname(&old_dname, old_dentry))) 1087 goto out1; 1088 1089 if ((rc = get_UCSname(&new_dname, new_dentry))) 1090 goto out2; 1091 1092 /* 1093 * Make sure source inode number is what we think it is 1094 */ 1095 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); 1096 if (rc || (ino != old_ip->i_ino)) { 1097 rc = -ENOENT; 1098 goto out3; 1099 } 1100 1101 /* 1102 * Make sure dest inode number (if any) is what we think it is 1103 */ 1104 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); 1105 if (rc == 0) { 1106 if ((new_ip == 0) || (ino != new_ip->i_ino)) { 1107 rc = -ESTALE; 1108 goto out3; 1109 } 1110 } else if (rc != -ENOENT) 1111 goto out3; 1112 else if (new_ip) { 1113 /* no entry exists, but one was expected */ 1114 rc = -ESTALE; 1115 goto out3; 1116 } 1117 1118 if (S_ISDIR(old_ip->i_mode)) { 1119 if (new_ip) { 1120 if (!dtEmpty(new_ip)) { 1121 rc = -ENOTEMPTY; 1122 goto out3; 1123 } 1124 } else if ((new_dir != old_dir) && 1125 (new_dir->i_nlink == JFS_LINK_MAX)) { 1126 rc = -EMLINK; 1127 goto out3; 1128 } 1129 } else if (new_ip) { 1130 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); 1131 /* Init inode for quota operations. */ 1132 DQUOT_INIT(new_ip); 1133 } 1134 1135 /* 1136 * The real work starts here 1137 */ 1138 tid = txBegin(new_dir->i_sb, 0); 1139 1140 /* 1141 * How do we know the locking is safe from deadlocks? 1142 * The vfs does the hard part for us. Any time we are taking nested 1143 * commit_mutexes, the vfs already has i_mutex held on the parent. 1144 * Here, the vfs has already taken i_mutex on both old_dir and new_dir. 1145 */ 1146 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); 1147 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); 1148 if (old_dir != new_dir) 1149 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, 1150 COMMIT_MUTEX_SECOND_PARENT); 1151 1152 if (new_ip) { 1153 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, 1154 COMMIT_MUTEX_VICTIM); 1155 /* 1156 * Change existing directory entry to new inode number 1157 */ 1158 ino = new_ip->i_ino; 1159 rc = dtModify(tid, new_dir, &new_dname, &ino, 1160 old_ip->i_ino, JFS_RENAME); 1161 if (rc) 1162 goto out4; 1163 drop_nlink(new_ip); 1164 if (S_ISDIR(new_ip->i_mode)) { 1165 drop_nlink(new_ip); 1166 if (new_ip->i_nlink) { 1167 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1168 if (old_dir != new_dir) 1169 mutex_unlock(&JFS_IP(old_dir)->commit_mutex); 1170 mutex_unlock(&JFS_IP(old_ip)->commit_mutex); 1171 mutex_unlock(&JFS_IP(new_dir)->commit_mutex); 1172 if (!S_ISDIR(old_ip->i_mode) && new_ip) 1173 IWRITE_UNLOCK(new_ip); 1174 jfs_error(new_ip->i_sb, 1175 "jfs_rename: new_ip->i_nlink != 0"); 1176 return -EIO; 1177 } 1178 tblk = tid_to_tblock(tid); 1179 tblk->xflag |= COMMIT_DELETE; 1180 tblk->u.ip = new_ip; 1181 } else if (new_ip->i_nlink == 0) { 1182 assert(!test_cflag(COMMIT_Nolink, new_ip)); 1183 /* free block resources */ 1184 if ((new_size = commitZeroLink(tid, new_ip)) < 0) { 1185 txAbort(tid, 1); /* Marks FS Dirty */ 1186 rc = new_size; 1187 goto out4; 1188 } 1189 tblk = tid_to_tblock(tid); 1190 tblk->xflag |= COMMIT_DELETE; 1191 tblk->u.ip = new_ip; 1192 } else { 1193 new_ip->i_ctime = CURRENT_TIME; 1194 mark_inode_dirty(new_ip); 1195 } 1196 } else { 1197 /* 1198 * Add new directory entry 1199 */ 1200 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, 1201 JFS_CREATE); 1202 if (rc) { 1203 jfs_err("jfs_rename didn't expect dtSearch to fail " 1204 "w/rc = %d", rc); 1205 goto out4; 1206 } 1207 1208 ino = old_ip->i_ino; 1209 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); 1210 if (rc) { 1211 if (rc == -EIO) 1212 jfs_err("jfs_rename: dtInsert returned -EIO"); 1213 goto out4; 1214 } 1215 if (S_ISDIR(old_ip->i_mode)) 1216 inc_nlink(new_dir); 1217 } 1218 /* 1219 * Remove old directory entry 1220 */ 1221 1222 ino = old_ip->i_ino; 1223 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); 1224 if (rc) { 1225 jfs_err("jfs_rename did not expect dtDelete to return rc = %d", 1226 rc); 1227 txAbort(tid, 1); /* Marks Filesystem dirty */ 1228 goto out4; 1229 } 1230 if (S_ISDIR(old_ip->i_mode)) { 1231 drop_nlink(old_dir); 1232 if (old_dir != new_dir) { 1233 /* 1234 * Change inode number of parent for moved directory 1235 */ 1236 1237 JFS_IP(old_ip)->i_dtroot.header.idotdot = 1238 cpu_to_le32(new_dir->i_ino); 1239 1240 /* Linelock header of dtree */ 1241 tlck = txLock(tid, old_ip, 1242 (struct metapage *) &JFS_IP(old_ip)->bxflag, 1243 tlckDTREE | tlckBTROOT | tlckRELINK); 1244 dtlck = (struct dt_lock *) & tlck->lock; 1245 ASSERT(dtlck->index == 0); 1246 lv = & dtlck->lv[0]; 1247 lv->offset = 0; 1248 lv->length = 1; 1249 dtlck->index++; 1250 } 1251 } 1252 1253 /* 1254 * Update ctime on changed/moved inodes & mark dirty 1255 */ 1256 old_ip->i_ctime = CURRENT_TIME; 1257 mark_inode_dirty(old_ip); 1258 1259 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); 1260 mark_inode_dirty(new_dir); 1261 1262 /* Build list of inodes modified by this transaction */ 1263 ipcount = 0; 1264 iplist[ipcount++] = old_ip; 1265 if (new_ip) 1266 iplist[ipcount++] = new_ip; 1267 iplist[ipcount++] = old_dir; 1268 1269 if (old_dir != new_dir) { 1270 iplist[ipcount++] = new_dir; 1271 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; 1272 mark_inode_dirty(old_dir); 1273 } 1274 1275 /* 1276 * Incomplete truncate of file data can 1277 * result in timing problems unless we synchronously commit the 1278 * transaction. 1279 */ 1280 if (new_size) 1281 commit_flag = COMMIT_SYNC; 1282 else 1283 commit_flag = 0; 1284 1285 rc = txCommit(tid, ipcount, iplist, commit_flag); 1286 1287 out4: 1288 txEnd(tid); 1289 if (new_ip) 1290 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1291 if (old_dir != new_dir) 1292 mutex_unlock(&JFS_IP(old_dir)->commit_mutex); 1293 mutex_unlock(&JFS_IP(old_ip)->commit_mutex); 1294 mutex_unlock(&JFS_IP(new_dir)->commit_mutex); 1295 1296 while (new_size && (rc == 0)) { 1297 tid = txBegin(new_ip->i_sb, 0); 1298 mutex_lock(&JFS_IP(new_ip)->commit_mutex); 1299 new_size = xtTruncate_pmap(tid, new_ip, new_size); 1300 if (new_size < 0) { 1301 txAbort(tid, 1); 1302 rc = new_size; 1303 } else 1304 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); 1305 txEnd(tid); 1306 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1307 } 1308 if (new_ip && (new_ip->i_nlink == 0)) 1309 set_cflag(COMMIT_Nolink, new_ip); 1310 out3: 1311 free_UCSname(&new_dname); 1312 out2: 1313 free_UCSname(&old_dname); 1314 out1: 1315 if (new_ip && !S_ISDIR(new_ip->i_mode)) 1316 IWRITE_UNLOCK(new_ip); 1317 /* 1318 * Truncating the directory index table is not guaranteed. It 1319 * may need to be done iteratively 1320 */ 1321 if (test_cflag(COMMIT_Stale, old_dir)) { 1322 if (old_dir->i_size > 1) 1323 jfs_truncate_nolock(old_dir, 0); 1324 1325 clear_cflag(COMMIT_Stale, old_dir); 1326 } 1327 1328 jfs_info("jfs_rename: returning %d", rc); 1329 return rc; 1330} 1331 1332 1333/* 1334 * NAME: jfs_mknod 1335 * 1336 * FUNCTION: Create a special file (device) 1337 */ 1338static int jfs_mknod(struct inode *dir, struct dentry *dentry, 1339 int mode, dev_t rdev) 1340{ 1341 struct jfs_inode_info *jfs_ip; 1342 struct btstack btstack; 1343 struct component_name dname; 1344 ino_t ino; 1345 struct inode *ip; 1346 struct inode *iplist[2]; 1347 int rc; 1348 tid_t tid; 1349 struct tblock *tblk; 1350 1351 if (!new_valid_dev(rdev)) 1352 return -EINVAL; 1353 1354 jfs_info("jfs_mknod: %s", dentry->d_name.name); 1355 1356 if ((rc = get_UCSname(&dname, dentry))) 1357 goto out; 1358 1359 ip = ialloc(dir, mode); 1360 if (IS_ERR(ip)) { 1361 rc = PTR_ERR(ip); 1362 goto out1; 1363 } 1364 jfs_ip = JFS_IP(ip); 1365 1366 tid = txBegin(dir->i_sb, 0); 1367 1368 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); 1369 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 1370 1371 rc = jfs_init_acl(tid, ip, dir); 1372 if (rc) 1373 goto out3; 1374 1375 rc = jfs_init_security(tid, ip, dir); 1376 if (rc) { 1377 txAbort(tid, 0); 1378 goto out3; 1379 } 1380 1381 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { 1382 txAbort(tid, 0); 1383 goto out3; 1384 } 1385 1386 tblk = tid_to_tblock(tid); 1387 tblk->xflag |= COMMIT_CREATE; 1388 tblk->ino = ip->i_ino; 1389 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 1390 1391 ino = ip->i_ino; 1392 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { 1393 txAbort(tid, 0); 1394 goto out3; 1395 } 1396 1397 ip->i_op = &jfs_file_inode_operations; 1398 jfs_ip->dev = new_encode_dev(rdev); 1399 init_special_inode(ip, ip->i_mode, rdev); 1400 1401 insert_inode_hash(ip); 1402 mark_inode_dirty(ip); 1403 1404 dir->i_ctime = dir->i_mtime = CURRENT_TIME; 1405 1406 mark_inode_dirty(dir); 1407 1408 iplist[0] = dir; 1409 iplist[1] = ip; 1410 rc = txCommit(tid, 2, iplist, 0); 1411 1412 out3: 1413 txEnd(tid); 1414 mutex_unlock(&JFS_IP(ip)->commit_mutex); 1415 mutex_unlock(&JFS_IP(dir)->commit_mutex); 1416 if (rc) { 1417 free_ea_wmap(ip); 1418 ip->i_nlink = 0; 1419 iput(ip); 1420 } else 1421 d_instantiate(dentry, ip); 1422 1423 out1: 1424 free_UCSname(&dname); 1425 1426 out: 1427 jfs_info("jfs_mknod: returning %d", rc); 1428 return rc; 1429} 1430 1431static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) 1432{ 1433 struct btstack btstack; 1434 ino_t inum; 1435 struct inode *ip; 1436 struct component_name key; 1437 const char *name = dentry->d_name.name; 1438 int len = dentry->d_name.len; 1439 int rc; 1440 1441 jfs_info("jfs_lookup: name = %s", name); 1442 1443 if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2) 1444 dentry->d_op = &jfs_ci_dentry_operations; 1445 1446 if ((name[0] == '.') && (len == 1)) 1447 inum = dip->i_ino; 1448 else if (strcmp(name, "..") == 0) 1449 inum = PARENT(dip); 1450 else { 1451 if ((rc = get_UCSname(&key, dentry))) 1452 return ERR_PTR(rc); 1453 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); 1454 free_UCSname(&key); 1455 if (rc == -ENOENT) { 1456 d_add(dentry, NULL); 1457 return ERR_PTR(0); 1458 } else if (rc) { 1459 jfs_err("jfs_lookup: dtSearch returned %d", rc); 1460 return ERR_PTR(rc); 1461 } 1462 } 1463 1464 ip = iget(dip->i_sb, inum); 1465 if (ip == NULL || is_bad_inode(ip)) { 1466 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum); 1467 if (ip) 1468 iput(ip); 1469 return ERR_PTR(-EACCES); 1470 } 1471 1472 dentry = d_splice_alias(ip, dentry); 1473 1474 if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)) 1475 dentry->d_op = &jfs_ci_dentry_operations; 1476 1477 return dentry; 1478} 1479 1480struct dentry *jfs_get_parent(struct dentry *dentry) 1481{ 1482 struct super_block *sb = dentry->d_inode->i_sb; 1483 struct dentry *parent = ERR_PTR(-ENOENT); 1484 struct inode *inode; 1485 unsigned long parent_ino; 1486 1487 parent_ino = 1488 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot); 1489 inode = iget(sb, parent_ino); 1490 if (inode) { 1491 if (is_bad_inode(inode)) { 1492 iput(inode); 1493 parent = ERR_PTR(-EACCES); 1494 } else { 1495 parent = d_alloc_anon(inode); 1496 if (!parent) { 1497 parent = ERR_PTR(-ENOMEM); 1498 iput(inode); 1499 } 1500 } 1501 } 1502 1503 return parent; 1504} 1505 1506const struct inode_operations jfs_dir_inode_operations = { 1507 .create = jfs_create, 1508 .lookup = jfs_lookup, 1509 .link = jfs_link, 1510 .unlink = jfs_unlink, 1511 .symlink = jfs_symlink, 1512 .mkdir = jfs_mkdir, 1513 .rmdir = jfs_rmdir, 1514 .mknod = jfs_mknod, 1515 .rename = jfs_rename, 1516 .setxattr = jfs_setxattr, 1517 .getxattr = jfs_getxattr, 1518 .listxattr = jfs_listxattr, 1519 .removexattr = jfs_removexattr, 1520#ifdef CONFIG_JFS_POSIX_ACL 1521 .setattr = jfs_setattr, 1522 .permission = jfs_permission, 1523#endif 1524}; 1525 1526const struct file_operations jfs_dir_operations = { 1527 .read = generic_read_dir, 1528 .readdir = jfs_readdir, 1529 .fsync = jfs_fsync, 1530 .ioctl = jfs_ioctl, 1531}; 1532 1533static int jfs_ci_hash(struct dentry *dir, struct qstr *this) 1534{ 1535 unsigned long hash; 1536 int i; 1537 1538 hash = init_name_hash(); 1539 for (i=0; i < this->len; i++) 1540 hash = partial_name_hash(tolower(this->name[i]), hash); 1541 this->hash = end_name_hash(hash); 1542 1543 return 0; 1544} 1545 1546static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b) 1547{ 1548 int i, result = 1; 1549 1550 if (a->len != b->len) 1551 goto out; 1552 for (i=0; i < a->len; i++) { 1553 if (tolower(a->name[i]) != tolower(b->name[i])) 1554 goto out; 1555 } 1556 result = 0; 1557 1558 /* 1559 * We want creates to preserve case. A negative dentry, a, that 1560 * has a different case than b may cause a new entry to be created 1561 * with the wrong case. Since we can't tell if a comes from a negative 1562 * dentry, we blindly replace it with b. This should be harmless if 1563 * a is not a negative dentry. 1564 */ 1565 memcpy((unsigned char *)a->name, b->name, a->len); 1566out: 1567 return result; 1568} 1569 1570struct dentry_operations jfs_ci_dentry_operations = 1571{ 1572 .d_hash = jfs_ci_hash, 1573 .d_compare = jfs_ci_compare, 1574}; 1575