1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Copyright (C) International Business Machines Corp., 2000-2004 4 * Portions Copyright (C) Christoph Hellwig, 2001-2002 5 */ 6 7#include <linux/fs.h> 8#include <linux/namei.h> 9#include <linux/ctype.h> 10#include <linux/quotaops.h> 11#include <linux/exportfs.h> 12#include "jfs_incore.h" 13#include "jfs_superblock.h" 14#include "jfs_inode.h" 15#include "jfs_dinode.h" 16#include "jfs_dmap.h" 17#include "jfs_unicode.h" 18#include "jfs_metapage.h" 19#include "jfs_xattr.h" 20#include "jfs_acl.h" 21#include "jfs_debug.h" 22 23/* 24 * forward references 25 */ 26const struct dentry_operations jfs_ci_dentry_operations; 27 28static s64 commitZeroLink(tid_t, struct inode *); 29 30/* 31 * NAME: free_ea_wmap(inode) 32 * 33 * FUNCTION: free uncommitted extended attributes from working map 34 * 35 */ 36static inline void free_ea_wmap(struct inode *inode) 37{ 38 dxd_t *ea = &JFS_IP(inode)->ea; 39 40 if (ea->flag & DXD_EXTENT) { 41 /* free EA pages from cache */ 42 invalidate_dxd_metapages(inode, *ea); 43 dbFree(inode, addressDXD(ea), lengthDXD(ea)); 44 } 45 ea->flag = 0; 46} 47 48/* 49 * NAME: jfs_create(dip, dentry, mode) 50 * 51 * FUNCTION: create a regular file in the parent directory <dip> 52 * with name = <from dentry> and mode = <mode> 53 * 54 * PARAMETER: dip - parent directory vnode 55 * dentry - dentry of new file 56 * mode - create mode (rwxrwxrwx). 57 * nd- nd struct 58 * 59 * RETURN: Errors from subroutines 60 * 61 */ 62static int jfs_create(struct mnt_idmap *idmap, struct inode *dip, 63 struct dentry *dentry, umode_t mode, bool excl) 64{ 65 int rc = 0; 66 tid_t tid; /* transaction id */ 67 struct inode *ip = NULL; /* child directory inode */ 68 ino_t ino; 69 struct component_name dname; /* child directory name */ 70 struct btstack btstack; 71 struct inode *iplist[2]; 72 struct tblock *tblk; 73 74 jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry); 75 76 rc = dquot_initialize(dip); 77 if (rc) 78 goto out1; 79 80 /* 81 * search parent directory for entry/freespace 82 * (dtSearch() returns parent directory page pinned) 83 */ 84 if ((rc = get_UCSname(&dname, dentry))) 85 goto out1; 86 87 /* 88 * Either iAlloc() or txBegin() may block. Deadlock can occur if we 89 * block there while holding dtree page, so we allocate the inode & 90 * begin the transaction before we search the directory. 91 */ 92 ip = ialloc(dip, mode); 93 if (IS_ERR(ip)) { 94 rc = PTR_ERR(ip); 95 goto out2; 96 } 97 98 tid = txBegin(dip->i_sb, 0); 99 100 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 101 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 102 103 rc = jfs_init_acl(tid, ip, dip); 104 if (rc) 105 goto out3; 106 107 rc = jfs_init_security(tid, ip, dip, &dentry->d_name); 108 if (rc) { 109 txAbort(tid, 0); 110 goto out3; 111 } 112 113 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { 114 jfs_err("jfs_create: dtSearch returned %d", rc); 115 txAbort(tid, 0); 116 goto out3; 117 } 118 119 tblk = tid_to_tblock(tid); 120 tblk->xflag |= COMMIT_CREATE; 121 tblk->ino = ip->i_ino; 122 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 123 124 iplist[0] = dip; 125 iplist[1] = ip; 126 127 /* 128 * initialize the child XAD tree root in-line in inode 129 */ 130 xtInitRoot(tid, ip); 131 132 /* 133 * create entry in parent directory for child directory 134 * (dtInsert() releases parent directory page) 135 */ 136 ino = ip->i_ino; 137 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { 138 if (rc == -EIO) { 139 jfs_err("jfs_create: dtInsert returned -EIO"); 140 txAbort(tid, 1); /* Marks Filesystem dirty */ 141 } else 142 txAbort(tid, 0); /* Filesystem full */ 143 goto out3; 144 } 145 146 ip->i_op = &jfs_file_inode_operations; 147 ip->i_fop = &jfs_file_operations; 148 ip->i_mapping->a_ops = &jfs_aops; 149 150 mark_inode_dirty(ip); 151 152 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip)); 153 154 mark_inode_dirty(dip); 155 156 rc = txCommit(tid, 2, &iplist[0], 0); 157 158 out3: 159 txEnd(tid); 160 mutex_unlock(&JFS_IP(ip)->commit_mutex); 161 mutex_unlock(&JFS_IP(dip)->commit_mutex); 162 if (rc) { 163 free_ea_wmap(ip); 164 clear_nlink(ip); 165 discard_new_inode(ip); 166 } else { 167 d_instantiate_new(dentry, ip); 168 } 169 170 out2: 171 free_UCSname(&dname); 172 173 out1: 174 175 jfs_info("jfs_create: rc:%d", rc); 176 return rc; 177} 178 179 180/* 181 * NAME: jfs_mkdir(dip, dentry, mode) 182 * 183 * FUNCTION: create a child directory in the parent directory <dip> 184 * with name = <from dentry> and mode = <mode> 185 * 186 * PARAMETER: dip - parent directory vnode 187 * dentry - dentry of child directory 188 * mode - create mode (rwxrwxrwx). 189 * 190 * RETURN: Errors from subroutines 191 * 192 * note: 193 * EACCES: user needs search+write permission on the parent directory 194 */ 195static int jfs_mkdir(struct mnt_idmap *idmap, struct inode *dip, 196 struct dentry *dentry, umode_t 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:%pd", dip, dentry); 208 209 rc = dquot_initialize(dip); 210 if (rc) 211 goto out1; 212 213 /* 214 * search parent directory for entry/freespace 215 * (dtSearch() returns parent directory page pinned) 216 */ 217 if ((rc = get_UCSname(&dname, dentry))) 218 goto out1; 219 220 /* 221 * Either iAlloc() or txBegin() may block. Deadlock can occur if we 222 * block there while holding dtree page, so we allocate the inode & 223 * begin the transaction before we search the directory. 224 */ 225 ip = ialloc(dip, S_IFDIR | mode); 226 if (IS_ERR(ip)) { 227 rc = PTR_ERR(ip); 228 goto out2; 229 } 230 231 tid = txBegin(dip->i_sb, 0); 232 233 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 234 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 235 236 rc = jfs_init_acl(tid, ip, dip); 237 if (rc) 238 goto out3; 239 240 rc = jfs_init_security(tid, ip, dip, &dentry->d_name); 241 if (rc) { 242 txAbort(tid, 0); 243 goto out3; 244 } 245 246 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { 247 jfs_err("jfs_mkdir: dtSearch returned %d", rc); 248 txAbort(tid, 0); 249 goto out3; 250 } 251 252 tblk = tid_to_tblock(tid); 253 tblk->xflag |= COMMIT_CREATE; 254 tblk->ino = ip->i_ino; 255 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 256 257 iplist[0] = dip; 258 iplist[1] = ip; 259 260 /* 261 * initialize the child directory in-line in inode 262 */ 263 dtInitRoot(tid, ip, dip->i_ino); 264 265 /* 266 * create entry in parent directory for child directory 267 * (dtInsert() releases parent directory page) 268 */ 269 ino = ip->i_ino; 270 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { 271 if (rc == -EIO) { 272 jfs_err("jfs_mkdir: dtInsert returned -EIO"); 273 txAbort(tid, 1); /* Marks Filesystem dirty */ 274 } else 275 txAbort(tid, 0); /* Filesystem full */ 276 goto out3; 277 } 278 279 set_nlink(ip, 2); /* for '.' */ 280 ip->i_op = &jfs_dir_inode_operations; 281 ip->i_fop = &jfs_dir_operations; 282 283 mark_inode_dirty(ip); 284 285 /* update parent directory inode */ 286 inc_nlink(dip); /* for '..' from child directory */ 287 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip)); 288 mark_inode_dirty(dip); 289 290 rc = txCommit(tid, 2, &iplist[0], 0); 291 292 out3: 293 txEnd(tid); 294 mutex_unlock(&JFS_IP(ip)->commit_mutex); 295 mutex_unlock(&JFS_IP(dip)->commit_mutex); 296 if (rc) { 297 free_ea_wmap(ip); 298 clear_nlink(ip); 299 discard_new_inode(ip); 300 } else { 301 d_instantiate_new(dentry, ip); 302 } 303 304 out2: 305 free_UCSname(&dname); 306 307 308 out1: 309 310 jfs_info("jfs_mkdir: rc:%d", rc); 311 return rc; 312} 313 314/* 315 * NAME: jfs_rmdir(dip, dentry) 316 * 317 * FUNCTION: remove a link to child directory 318 * 319 * PARAMETER: dip - parent inode 320 * dentry - child directory dentry 321 * 322 * RETURN: -EINVAL - if name is . or .. 323 * -EINVAL - if . or .. exist but are invalid. 324 * errors from subroutines 325 * 326 * note: 327 * if other threads have the directory open when the last link 328 * is removed, the "." and ".." entries, if present, are removed before 329 * rmdir() returns and no new entries may be created in the directory, 330 * but the directory is not removed until the last reference to 331 * the directory is released (cf.unlink() of regular file). 332 */ 333static int jfs_rmdir(struct inode *dip, struct dentry *dentry) 334{ 335 int rc; 336 tid_t tid; /* transaction id */ 337 struct inode *ip = d_inode(dentry); 338 ino_t ino; 339 struct component_name dname; 340 struct inode *iplist[2]; 341 struct tblock *tblk; 342 343 jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry); 344 345 /* Init inode for quota operations. */ 346 rc = dquot_initialize(dip); 347 if (rc) 348 goto out; 349 rc = dquot_initialize(ip); 350 if (rc) 351 goto out; 352 353 /* directory must be empty to be removed */ 354 if (!dtEmpty(ip)) { 355 rc = -ENOTEMPTY; 356 goto out; 357 } 358 359 if ((rc = get_UCSname(&dname, dentry))) { 360 goto out; 361 } 362 363 tid = txBegin(dip->i_sb, 0); 364 365 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 366 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 367 368 iplist[0] = dip; 369 iplist[1] = ip; 370 371 tblk = tid_to_tblock(tid); 372 tblk->xflag |= COMMIT_DELETE; 373 tblk->u.ip = ip; 374 375 /* 376 * delete the entry of target directory from parent directory 377 */ 378 ino = ip->i_ino; 379 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { 380 jfs_err("jfs_rmdir: dtDelete returned %d", rc); 381 if (rc == -EIO) 382 txAbort(tid, 1); 383 txEnd(tid); 384 mutex_unlock(&JFS_IP(ip)->commit_mutex); 385 mutex_unlock(&JFS_IP(dip)->commit_mutex); 386 387 goto out2; 388 } 389 390 /* update parent directory's link count corresponding 391 * to ".." entry of the target directory deleted 392 */ 393 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip)); 394 inode_dec_link_count(dip); 395 396 /* 397 * OS/2 could have created EA and/or ACL 398 */ 399 /* free EA from both persistent and working map */ 400 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { 401 /* free EA pages */ 402 txEA(tid, ip, &JFS_IP(ip)->ea, NULL); 403 } 404 JFS_IP(ip)->ea.flag = 0; 405 406 /* free ACL from both persistent and working map */ 407 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { 408 /* free ACL pages */ 409 txEA(tid, ip, &JFS_IP(ip)->acl, NULL); 410 } 411 JFS_IP(ip)->acl.flag = 0; 412 413 /* mark the target directory as deleted */ 414 clear_nlink(ip); 415 mark_inode_dirty(ip); 416 417 rc = txCommit(tid, 2, &iplist[0], 0); 418 419 txEnd(tid); 420 421 mutex_unlock(&JFS_IP(ip)->commit_mutex); 422 mutex_unlock(&JFS_IP(dip)->commit_mutex); 423 424 /* 425 * Truncating the directory index table is not guaranteed. It 426 * may need to be done iteratively 427 */ 428 if (test_cflag(COMMIT_Stale, dip)) { 429 if (dip->i_size > 1) 430 jfs_truncate_nolock(dip, 0); 431 432 clear_cflag(COMMIT_Stale, dip); 433 } 434 435 out2: 436 free_UCSname(&dname); 437 438 out: 439 jfs_info("jfs_rmdir: rc:%d", rc); 440 return rc; 441} 442 443/* 444 * NAME: jfs_unlink(dip, dentry) 445 * 446 * FUNCTION: remove a link to object <vp> named by <name> 447 * from parent directory <dvp> 448 * 449 * PARAMETER: dip - inode of parent directory 450 * dentry - dentry of object to be removed 451 * 452 * RETURN: errors from subroutines 453 * 454 * note: 455 * temporary file: if one or more processes have the file open 456 * when the last link is removed, the link will be removed before 457 * unlink() returns, but the removal of the file contents will be 458 * postponed until all references to the files are closed. 459 * 460 * JFS does NOT support unlink() on directories. 461 * 462 */ 463static int jfs_unlink(struct inode *dip, struct dentry *dentry) 464{ 465 int rc; 466 tid_t tid; /* transaction id */ 467 struct inode *ip = d_inode(dentry); 468 ino_t ino; 469 struct component_name dname; /* object name */ 470 struct inode *iplist[2]; 471 struct tblock *tblk; 472 s64 new_size = 0; 473 int commit_flag; 474 475 jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry); 476 477 /* Init inode for quota operations. */ 478 rc = dquot_initialize(dip); 479 if (rc) 480 goto out; 481 rc = dquot_initialize(ip); 482 if (rc) 483 goto out; 484 485 if ((rc = get_UCSname(&dname, dentry))) 486 goto out; 487 488 IWRITE_LOCK(ip, RDWRLOCK_NORMAL); 489 490 tid = txBegin(dip->i_sb, 0); 491 492 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 493 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 494 495 iplist[0] = dip; 496 iplist[1] = ip; 497 498 /* 499 * delete the entry of target file from parent directory 500 */ 501 ino = ip->i_ino; 502 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { 503 jfs_err("jfs_unlink: dtDelete returned %d", rc); 504 if (rc == -EIO) 505 txAbort(tid, 1); /* Marks FS Dirty */ 506 txEnd(tid); 507 mutex_unlock(&JFS_IP(ip)->commit_mutex); 508 mutex_unlock(&JFS_IP(dip)->commit_mutex); 509 IWRITE_UNLOCK(ip); 510 goto out1; 511 } 512 513 ASSERT(ip->i_nlink); 514 515 inode_set_mtime_to_ts(dip, 516 inode_set_ctime_to_ts(dip, inode_set_ctime_current(ip))); 517 mark_inode_dirty(dip); 518 519 /* update target's inode */ 520 inode_dec_link_count(ip); 521 522 /* 523 * commit zero link count object 524 */ 525 if (ip->i_nlink == 0) { 526 assert(!test_cflag(COMMIT_Nolink, ip)); 527 /* free block resources */ 528 if ((new_size = commitZeroLink(tid, ip)) < 0) { 529 txAbort(tid, 1); /* Marks FS Dirty */ 530 txEnd(tid); 531 mutex_unlock(&JFS_IP(ip)->commit_mutex); 532 mutex_unlock(&JFS_IP(dip)->commit_mutex); 533 IWRITE_UNLOCK(ip); 534 rc = new_size; 535 goto out1; 536 } 537 tblk = tid_to_tblock(tid); 538 tblk->xflag |= COMMIT_DELETE; 539 tblk->u.ip = ip; 540 } 541 542 /* 543 * Incomplete truncate of file data can 544 * result in timing problems unless we synchronously commit the 545 * transaction. 546 */ 547 if (new_size) 548 commit_flag = COMMIT_SYNC; 549 else 550 commit_flag = 0; 551 552 /* 553 * If xtTruncate was incomplete, commit synchronously to avoid 554 * timing complications 555 */ 556 rc = txCommit(tid, 2, &iplist[0], commit_flag); 557 558 txEnd(tid); 559 560 mutex_unlock(&JFS_IP(ip)->commit_mutex); 561 mutex_unlock(&JFS_IP(dip)->commit_mutex); 562 563 while (new_size && (rc == 0)) { 564 tid = txBegin(dip->i_sb, 0); 565 mutex_lock(&JFS_IP(ip)->commit_mutex); 566 new_size = xtTruncate_pmap(tid, ip, new_size); 567 if (new_size < 0) { 568 txAbort(tid, 1); /* Marks FS Dirty */ 569 rc = new_size; 570 } else 571 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); 572 txEnd(tid); 573 mutex_unlock(&JFS_IP(ip)->commit_mutex); 574 } 575 576 if (ip->i_nlink == 0) 577 set_cflag(COMMIT_Nolink, ip); 578 579 IWRITE_UNLOCK(ip); 580 581 /* 582 * Truncating the directory index table is not guaranteed. It 583 * may need to be done iteratively 584 */ 585 if (test_cflag(COMMIT_Stale, dip)) { 586 if (dip->i_size > 1) 587 jfs_truncate_nolock(dip, 0); 588 589 clear_cflag(COMMIT_Stale, dip); 590 } 591 592 out1: 593 free_UCSname(&dname); 594 out: 595 jfs_info("jfs_unlink: rc:%d", rc); 596 return rc; 597} 598 599/* 600 * NAME: commitZeroLink() 601 * 602 * FUNCTION: for non-directory, called by jfs_remove(), 603 * truncate a regular file, directory or symbolic 604 * link to zero length. return 0 if type is not 605 * one of these. 606 * 607 * if the file is currently associated with a VM segment 608 * only permanent disk and inode map resources are freed, 609 * and neither the inode nor indirect blocks are modified 610 * so that the resources can be later freed in the work 611 * map by ctrunc1. 612 * if there is no VM segment on entry, the resources are 613 * freed in both work and permanent map. 614 * (? for temporary file - memory object is cached even 615 * after no reference: 616 * reference count > 0 - ) 617 * 618 * PARAMETERS: cd - pointer to commit data structure. 619 * current inode is the one to truncate. 620 * 621 * RETURN: Errors from subroutines 622 */ 623static s64 commitZeroLink(tid_t tid, struct inode *ip) 624{ 625 int filetype; 626 struct tblock *tblk; 627 628 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); 629 630 filetype = ip->i_mode & S_IFMT; 631 switch (filetype) { 632 case S_IFREG: 633 break; 634 case S_IFLNK: 635 /* fast symbolic link */ 636 if (ip->i_size < IDATASIZE) { 637 ip->i_size = 0; 638 return 0; 639 } 640 break; 641 default: 642 assert(filetype != S_IFDIR); 643 return 0; 644 } 645 646 set_cflag(COMMIT_Freewmap, ip); 647 648 /* mark transaction of block map update type */ 649 tblk = tid_to_tblock(tid); 650 tblk->xflag |= COMMIT_PMAP; 651 652 /* 653 * free EA 654 */ 655 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) 656 /* acquire maplock on EA to be freed from block map */ 657 txEA(tid, ip, &JFS_IP(ip)->ea, NULL); 658 659 /* 660 * free ACL 661 */ 662 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) 663 /* acquire maplock on EA to be freed from block map */ 664 txEA(tid, ip, &JFS_IP(ip)->acl, NULL); 665 666 /* 667 * free xtree/data (truncate to zero length): 668 * free xtree/data pages from cache if COMMIT_PWMAP, 669 * free xtree/data blocks from persistent block map, and 670 * free xtree/data blocks from working block map if COMMIT_PWMAP; 671 */ 672 if (ip->i_size) 673 return xtTruncate_pmap(tid, ip, 0); 674 675 return 0; 676} 677 678 679/* 680 * NAME: jfs_free_zero_link() 681 * 682 * FUNCTION: for non-directory, called by iClose(), 683 * free resources of a file from cache and WORKING map 684 * for a file previously committed with zero link count 685 * while associated with a pager object, 686 * 687 * PARAMETER: ip - pointer to inode of file. 688 */ 689void jfs_free_zero_link(struct inode *ip) 690{ 691 int type; 692 693 jfs_info("jfs_free_zero_link: ip = 0x%p", ip); 694 695 /* return if not reg or symbolic link or if size is 696 * already ok. 697 */ 698 type = ip->i_mode & S_IFMT; 699 700 switch (type) { 701 case S_IFREG: 702 break; 703 case S_IFLNK: 704 /* if its contained in inode nothing to do */ 705 if (ip->i_size < IDATASIZE) 706 return; 707 break; 708 default: 709 return; 710 } 711 712 /* 713 * free EA 714 */ 715 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { 716 s64 xaddr = addressDXD(&JFS_IP(ip)->ea); 717 int xlen = lengthDXD(&JFS_IP(ip)->ea); 718 struct maplock maplock; /* maplock for COMMIT_WMAP */ 719 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ 720 721 /* free EA pages from cache */ 722 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); 723 724 /* free EA extent from working block map */ 725 maplock.index = 1; 726 pxdlock = (struct pxd_lock *) & maplock; 727 pxdlock->flag = mlckFREEPXD; 728 PXDaddress(&pxdlock->pxd, xaddr); 729 PXDlength(&pxdlock->pxd, xlen); 730 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); 731 } 732 733 /* 734 * free ACL 735 */ 736 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { 737 s64 xaddr = addressDXD(&JFS_IP(ip)->acl); 738 int xlen = lengthDXD(&JFS_IP(ip)->acl); 739 struct maplock maplock; /* maplock for COMMIT_WMAP */ 740 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ 741 742 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); 743 744 /* free ACL extent from working block map */ 745 maplock.index = 1; 746 pxdlock = (struct pxd_lock *) & maplock; 747 pxdlock->flag = mlckFREEPXD; 748 PXDaddress(&pxdlock->pxd, xaddr); 749 PXDlength(&pxdlock->pxd, xlen); 750 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); 751 } 752 753 /* 754 * free xtree/data (truncate to zero length): 755 * free xtree/data pages from cache, and 756 * free xtree/data blocks from working block map; 757 */ 758 if (ip->i_size) 759 xtTruncate(0, ip, 0, COMMIT_WMAP); 760} 761 762/* 763 * NAME: jfs_link(vp, dvp, name, crp) 764 * 765 * FUNCTION: create a link to <vp> by the name = <name> 766 * in the parent directory <dvp> 767 * 768 * PARAMETER: vp - target object 769 * dvp - parent directory of new link 770 * name - name of new link to target object 771 * crp - credential 772 * 773 * RETURN: Errors from subroutines 774 * 775 * note: 776 * JFS does NOT support link() on directories (to prevent circular 777 * path in the directory hierarchy); 778 * EPERM: the target object is a directory, and either the caller 779 * does not have appropriate privileges or the implementation prohibits 780 * using link() on directories [XPG4.2]. 781 * 782 * JFS does NOT support links between file systems: 783 * EXDEV: target object and new link are on different file systems and 784 * implementation does not support links between file systems [XPG4.2]. 785 */ 786static int jfs_link(struct dentry *old_dentry, 787 struct inode *dir, struct dentry *dentry) 788{ 789 int rc; 790 tid_t tid; 791 struct inode *ip = d_inode(old_dentry); 792 ino_t ino; 793 struct component_name dname; 794 struct btstack btstack; 795 struct inode *iplist[2]; 796 797 jfs_info("jfs_link: %pd %pd", old_dentry, dentry); 798 799 rc = dquot_initialize(dir); 800 if (rc) 801 goto out; 802 803 if (isReadOnly(ip)) { 804 jfs_error(ip->i_sb, "read-only filesystem\n"); 805 return -EROFS; 806 } 807 808 tid = txBegin(ip->i_sb, 0); 809 810 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); 811 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 812 813 /* 814 * scan parent directory for entry/freespace 815 */ 816 if ((rc = get_UCSname(&dname, dentry))) 817 goto out_tx; 818 819 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) 820 goto free_dname; 821 822 /* 823 * create entry for new link in parent directory 824 */ 825 ino = ip->i_ino; 826 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) 827 goto free_dname; 828 829 /* update object inode */ 830 inc_nlink(ip); /* for new link */ 831 inode_set_ctime_current(ip); 832 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 833 mark_inode_dirty(dir); 834 ihold(ip); 835 836 iplist[0] = ip; 837 iplist[1] = dir; 838 rc = txCommit(tid, 2, &iplist[0], 0); 839 840 if (rc) { 841 drop_nlink(ip); /* never instantiated */ 842 iput(ip); 843 } else 844 d_instantiate(dentry, ip); 845 846 free_dname: 847 free_UCSname(&dname); 848 849 out_tx: 850 txEnd(tid); 851 852 mutex_unlock(&JFS_IP(ip)->commit_mutex); 853 mutex_unlock(&JFS_IP(dir)->commit_mutex); 854 855 out: 856 jfs_info("jfs_link: rc:%d", rc); 857 return rc; 858} 859 860/* 861 * NAME: jfs_symlink(dip, dentry, name) 862 * 863 * FUNCTION: creates a symbolic link to <symlink> by name <name> 864 * in directory <dip> 865 * 866 * PARAMETER: dip - parent directory vnode 867 * dentry - dentry of symbolic link 868 * name - the path name of the existing object 869 * that will be the source of the link 870 * 871 * RETURN: errors from subroutines 872 * 873 * note: 874 * ENAMETOOLONG: pathname resolution of a symbolic link produced 875 * an intermediate result whose length exceeds PATH_MAX [XPG4.2] 876*/ 877 878static int jfs_symlink(struct mnt_idmap *idmap, struct inode *dip, 879 struct dentry *dentry, const char *name) 880{ 881 int rc; 882 tid_t tid; 883 ino_t ino = 0; 884 struct component_name dname; 885 u32 ssize; /* source pathname size */ 886 struct btstack btstack; 887 struct inode *ip; 888 s64 xlen = 0; 889 int bmask = 0, xsize; 890 s64 xaddr; 891 struct metapage *mp; 892 struct super_block *sb; 893 struct tblock *tblk; 894 895 struct inode *iplist[2]; 896 897 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); 898 899 rc = dquot_initialize(dip); 900 if (rc) 901 goto out1; 902 903 ssize = strlen(name) + 1; 904 905 /* 906 * search parent directory for entry/freespace 907 * (dtSearch() returns parent directory page pinned) 908 */ 909 910 if ((rc = get_UCSname(&dname, dentry))) 911 goto out1; 912 913 /* 914 * allocate on-disk/in-memory inode for symbolic link: 915 * (iAlloc() returns new, locked inode) 916 */ 917 ip = ialloc(dip, S_IFLNK | 0777); 918 if (IS_ERR(ip)) { 919 rc = PTR_ERR(ip); 920 goto out2; 921 } 922 923 tid = txBegin(dip->i_sb, 0); 924 925 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); 926 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 927 928 rc = jfs_init_security(tid, ip, dip, &dentry->d_name); 929 if (rc) 930 goto out3; 931 932 tblk = tid_to_tblock(tid); 933 tblk->xflag |= COMMIT_CREATE; 934 tblk->ino = ip->i_ino; 935 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 936 937 /* fix symlink access permission 938 * (dir_create() ANDs in the u.u_cmask, 939 * but symlinks really need to be 777 access) 940 */ 941 ip->i_mode |= 0777; 942 943 /* 944 * write symbolic link target path name 945 */ 946 xtInitRoot(tid, ip); 947 948 /* 949 * write source path name inline in on-disk inode (fast symbolic link) 950 */ 951 952 if (ssize <= IDATASIZE) { 953 ip->i_op = &jfs_fast_symlink_inode_operations; 954 955 ip->i_link = JFS_IP(ip)->i_inline_all; 956 memcpy(ip->i_link, name, ssize); 957 ip->i_size = ssize - 1; 958 959 /* 960 * if symlink is > 128 bytes, we don't have the space to 961 * store inline extended attributes 962 */ 963 if (ssize > sizeof (JFS_IP(ip)->i_inline)) 964 JFS_IP(ip)->mode2 &= ~INLINEEA; 965 966 jfs_info("jfs_symlink: fast symlink added ssize:%u name:%s ", 967 ssize, name); 968 } 969 /* 970 * write source path name in a single extent 971 */ 972 else { 973 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); 974 975 ip->i_op = &jfs_symlink_inode_operations; 976 inode_nohighmem(ip); 977 ip->i_mapping->a_ops = &jfs_aops; 978 979 /* 980 * even though the data of symlink object (source 981 * path name) is treated as non-journaled user data, 982 * it is read/written thru buffer cache for performance. 983 */ 984 sb = ip->i_sb; 985 bmask = JFS_SBI(sb)->bsize - 1; 986 xsize = (ssize + bmask) & ~bmask; 987 xaddr = 0; 988 xlen = xsize >> JFS_SBI(sb)->l2bsize; 989 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { 990 txAbort(tid, 0); 991 goto out3; 992 } 993 ip->i_size = ssize - 1; 994 while (ssize) { 995 /* This is kind of silly since PATH_MAX == 4K */ 996 u32 copy_size = min_t(u32, ssize, PSIZE); 997 998 mp = get_metapage(ip, xaddr, PSIZE, 1); 999 1000 if (mp == NULL) { 1001 xtTruncate(tid, ip, 0, COMMIT_PWMAP); 1002 rc = -EIO; 1003 txAbort(tid, 0); 1004 goto out3; 1005 } 1006 memcpy(mp->data, name, copy_size); 1007 flush_metapage(mp); 1008 ssize -= copy_size; 1009 name += copy_size; 1010 xaddr += JFS_SBI(sb)->nbperpage; 1011 } 1012 } 1013 1014 /* 1015 * create entry for symbolic link in parent directory 1016 */ 1017 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); 1018 if (rc == 0) { 1019 ino = ip->i_ino; 1020 rc = dtInsert(tid, dip, &dname, &ino, &btstack); 1021 } 1022 if (rc) { 1023 if (xlen) 1024 xtTruncate(tid, ip, 0, COMMIT_PWMAP); 1025 txAbort(tid, 0); 1026 /* discard new inode */ 1027 goto out3; 1028 } 1029 1030 mark_inode_dirty(ip); 1031 1032 inode_set_mtime_to_ts(dip, inode_set_ctime_current(dip)); 1033 mark_inode_dirty(dip); 1034 /* 1035 * commit update of parent directory and link object 1036 */ 1037 1038 iplist[0] = dip; 1039 iplist[1] = ip; 1040 rc = txCommit(tid, 2, &iplist[0], 0); 1041 1042 out3: 1043 txEnd(tid); 1044 mutex_unlock(&JFS_IP(ip)->commit_mutex); 1045 mutex_unlock(&JFS_IP(dip)->commit_mutex); 1046 if (rc) { 1047 free_ea_wmap(ip); 1048 clear_nlink(ip); 1049 discard_new_inode(ip); 1050 } else { 1051 d_instantiate_new(dentry, ip); 1052 } 1053 1054 out2: 1055 free_UCSname(&dname); 1056 1057 out1: 1058 jfs_info("jfs_symlink: rc:%d", rc); 1059 return rc; 1060} 1061 1062 1063/* 1064 * NAME: jfs_rename 1065 * 1066 * FUNCTION: rename a file or directory 1067 */ 1068static int jfs_rename(struct mnt_idmap *idmap, struct inode *old_dir, 1069 struct dentry *old_dentry, struct inode *new_dir, 1070 struct dentry *new_dentry, unsigned int flags) 1071{ 1072 struct btstack btstack; 1073 ino_t ino; 1074 struct component_name new_dname; 1075 struct inode *new_ip; 1076 struct component_name old_dname; 1077 struct inode *old_ip; 1078 int rc; 1079 tid_t tid; 1080 struct tlock *tlck; 1081 struct dt_lock *dtlck; 1082 struct lv *lv; 1083 int ipcount; 1084 struct inode *iplist[4]; 1085 struct tblock *tblk; 1086 s64 new_size = 0; 1087 int commit_flag; 1088 1089 if (flags & ~RENAME_NOREPLACE) 1090 return -EINVAL; 1091 1092 jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry); 1093 1094 rc = dquot_initialize(old_dir); 1095 if (rc) 1096 goto out1; 1097 rc = dquot_initialize(new_dir); 1098 if (rc) 1099 goto out1; 1100 1101 old_ip = d_inode(old_dentry); 1102 new_ip = d_inode(new_dentry); 1103 1104 if ((rc = get_UCSname(&old_dname, old_dentry))) 1105 goto out1; 1106 1107 if ((rc = get_UCSname(&new_dname, new_dentry))) 1108 goto out2; 1109 1110 /* 1111 * Make sure source inode number is what we think it is 1112 */ 1113 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); 1114 if (rc || (ino != old_ip->i_ino)) { 1115 rc = -ENOENT; 1116 goto out3; 1117 } 1118 1119 /* 1120 * Make sure dest inode number (if any) is what we think it is 1121 */ 1122 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); 1123 if (!rc) { 1124 if ((!new_ip) || (ino != new_ip->i_ino)) { 1125 rc = -ESTALE; 1126 goto out3; 1127 } 1128 } else if (rc != -ENOENT) 1129 goto out3; 1130 else if (new_ip) { 1131 /* no entry exists, but one was expected */ 1132 rc = -ESTALE; 1133 goto out3; 1134 } 1135 1136 if (S_ISDIR(old_ip->i_mode)) { 1137 if (new_ip) { 1138 if (!dtEmpty(new_ip)) { 1139 rc = -ENOTEMPTY; 1140 goto out3; 1141 } 1142 } 1143 } else if (new_ip) { 1144 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); 1145 /* Init inode for quota operations. */ 1146 rc = dquot_initialize(new_ip); 1147 if (rc) 1148 goto out_unlock; 1149 } 1150 1151 /* 1152 * The real work starts here 1153 */ 1154 tid = txBegin(new_dir->i_sb, 0); 1155 1156 /* 1157 * How do we know the locking is safe from deadlocks? 1158 * The vfs does the hard part for us. Any time we are taking nested 1159 * commit_mutexes, the vfs already has i_mutex held on the parent. 1160 * Here, the vfs has already taken i_mutex on both old_dir and new_dir. 1161 */ 1162 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); 1163 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); 1164 if (old_dir != new_dir) 1165 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, 1166 COMMIT_MUTEX_SECOND_PARENT); 1167 1168 if (new_ip) { 1169 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, 1170 COMMIT_MUTEX_VICTIM); 1171 /* 1172 * Change existing directory entry to new inode number 1173 */ 1174 ino = new_ip->i_ino; 1175 rc = dtModify(tid, new_dir, &new_dname, &ino, 1176 old_ip->i_ino, JFS_RENAME); 1177 if (rc) 1178 goto out_tx; 1179 drop_nlink(new_ip); 1180 if (S_ISDIR(new_ip->i_mode)) { 1181 drop_nlink(new_ip); 1182 if (new_ip->i_nlink) { 1183 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1184 if (old_dir != new_dir) 1185 mutex_unlock(&JFS_IP(old_dir)->commit_mutex); 1186 mutex_unlock(&JFS_IP(old_ip)->commit_mutex); 1187 mutex_unlock(&JFS_IP(new_dir)->commit_mutex); 1188 if (!S_ISDIR(old_ip->i_mode) && new_ip) 1189 IWRITE_UNLOCK(new_ip); 1190 jfs_error(new_ip->i_sb, 1191 "new_ip->i_nlink != 0\n"); 1192 return -EIO; 1193 } 1194 tblk = tid_to_tblock(tid); 1195 tblk->xflag |= COMMIT_DELETE; 1196 tblk->u.ip = new_ip; 1197 } else if (new_ip->i_nlink == 0) { 1198 assert(!test_cflag(COMMIT_Nolink, new_ip)); 1199 /* free block resources */ 1200 if ((new_size = commitZeroLink(tid, new_ip)) < 0) { 1201 txAbort(tid, 1); /* Marks FS Dirty */ 1202 rc = new_size; 1203 goto out_tx; 1204 } 1205 tblk = tid_to_tblock(tid); 1206 tblk->xflag |= COMMIT_DELETE; 1207 tblk->u.ip = new_ip; 1208 } else { 1209 inode_set_ctime_current(new_ip); 1210 mark_inode_dirty(new_ip); 1211 } 1212 } else { 1213 /* 1214 * Add new directory entry 1215 */ 1216 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, 1217 JFS_CREATE); 1218 if (rc) { 1219 jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d", 1220 rc); 1221 goto out_tx; 1222 } 1223 1224 ino = old_ip->i_ino; 1225 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); 1226 if (rc) { 1227 if (rc == -EIO) 1228 jfs_err("jfs_rename: dtInsert returned -EIO"); 1229 goto out_tx; 1230 } 1231 if (S_ISDIR(old_ip->i_mode)) 1232 inc_nlink(new_dir); 1233 } 1234 /* 1235 * Remove old directory entry 1236 */ 1237 1238 ino = old_ip->i_ino; 1239 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); 1240 if (rc) { 1241 jfs_err("jfs_rename did not expect dtDelete to return rc = %d", 1242 rc); 1243 txAbort(tid, 1); /* Marks Filesystem dirty */ 1244 goto out_tx; 1245 } 1246 if (S_ISDIR(old_ip->i_mode)) { 1247 drop_nlink(old_dir); 1248 if (old_dir != new_dir) { 1249 /* 1250 * Change inode number of parent for moved directory 1251 */ 1252 1253 JFS_IP(old_ip)->i_dtroot.header.idotdot = 1254 cpu_to_le32(new_dir->i_ino); 1255 1256 /* Linelock header of dtree */ 1257 tlck = txLock(tid, old_ip, 1258 (struct metapage *) &JFS_IP(old_ip)->bxflag, 1259 tlckDTREE | tlckBTROOT | tlckRELINK); 1260 dtlck = (struct dt_lock *) & tlck->lock; 1261 ASSERT(dtlck->index == 0); 1262 lv = & dtlck->lv[0]; 1263 lv->offset = 0; 1264 lv->length = 1; 1265 dtlck->index++; 1266 } 1267 } 1268 1269 /* 1270 * Update ctime on changed/moved inodes & mark dirty 1271 */ 1272 inode_set_ctime_current(old_ip); 1273 mark_inode_dirty(old_ip); 1274 1275 inode_set_mtime_to_ts(new_dir, inode_set_ctime_current(new_dir)); 1276 mark_inode_dirty(new_dir); 1277 1278 /* Build list of inodes modified by this transaction */ 1279 ipcount = 0; 1280 iplist[ipcount++] = old_ip; 1281 if (new_ip) 1282 iplist[ipcount++] = new_ip; 1283 iplist[ipcount++] = old_dir; 1284 1285 if (old_dir != new_dir) { 1286 iplist[ipcount++] = new_dir; 1287 inode_set_mtime_to_ts(old_dir, 1288 inode_set_ctime_current(old_dir)); 1289 mark_inode_dirty(old_dir); 1290 } 1291 1292 /* 1293 * Incomplete truncate of file data can 1294 * result in timing problems unless we synchronously commit the 1295 * transaction. 1296 */ 1297 if (new_size) 1298 commit_flag = COMMIT_SYNC; 1299 else 1300 commit_flag = 0; 1301 1302 rc = txCommit(tid, ipcount, iplist, commit_flag); 1303 1304 out_tx: 1305 txEnd(tid); 1306 if (new_ip) 1307 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1308 if (old_dir != new_dir) 1309 mutex_unlock(&JFS_IP(old_dir)->commit_mutex); 1310 mutex_unlock(&JFS_IP(old_ip)->commit_mutex); 1311 mutex_unlock(&JFS_IP(new_dir)->commit_mutex); 1312 1313 while (new_size && (rc == 0)) { 1314 tid = txBegin(new_ip->i_sb, 0); 1315 mutex_lock(&JFS_IP(new_ip)->commit_mutex); 1316 new_size = xtTruncate_pmap(tid, new_ip, new_size); 1317 if (new_size < 0) { 1318 txAbort(tid, 1); 1319 rc = new_size; 1320 } else 1321 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); 1322 txEnd(tid); 1323 mutex_unlock(&JFS_IP(new_ip)->commit_mutex); 1324 } 1325 if (new_ip && (new_ip->i_nlink == 0)) 1326 set_cflag(COMMIT_Nolink, new_ip); 1327 /* 1328 * Truncating the directory index table is not guaranteed. It 1329 * may need to be done iteratively 1330 */ 1331 if (test_cflag(COMMIT_Stale, old_dir)) { 1332 if (old_dir->i_size > 1) 1333 jfs_truncate_nolock(old_dir, 0); 1334 1335 clear_cflag(COMMIT_Stale, old_dir); 1336 } 1337 out_unlock: 1338 if (new_ip && !S_ISDIR(new_ip->i_mode)) 1339 IWRITE_UNLOCK(new_ip); 1340 out3: 1341 free_UCSname(&new_dname); 1342 out2: 1343 free_UCSname(&old_dname); 1344 out1: 1345 jfs_info("jfs_rename: returning %d", rc); 1346 return rc; 1347} 1348 1349 1350/* 1351 * NAME: jfs_mknod 1352 * 1353 * FUNCTION: Create a special file (device) 1354 */ 1355static int jfs_mknod(struct mnt_idmap *idmap, struct inode *dir, 1356 struct dentry *dentry, umode_t mode, dev_t rdev) 1357{ 1358 struct jfs_inode_info *jfs_ip; 1359 struct btstack btstack; 1360 struct component_name dname; 1361 ino_t ino; 1362 struct inode *ip; 1363 struct inode *iplist[2]; 1364 int rc; 1365 tid_t tid; 1366 struct tblock *tblk; 1367 1368 jfs_info("jfs_mknod: %pd", dentry); 1369 1370 rc = dquot_initialize(dir); 1371 if (rc) 1372 goto out; 1373 1374 if ((rc = get_UCSname(&dname, dentry))) 1375 goto out; 1376 1377 ip = ialloc(dir, mode); 1378 if (IS_ERR(ip)) { 1379 rc = PTR_ERR(ip); 1380 goto out1; 1381 } 1382 jfs_ip = JFS_IP(ip); 1383 1384 tid = txBegin(dir->i_sb, 0); 1385 1386 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); 1387 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); 1388 1389 rc = jfs_init_acl(tid, ip, dir); 1390 if (rc) 1391 goto out3; 1392 1393 rc = jfs_init_security(tid, ip, dir, &dentry->d_name); 1394 if (rc) { 1395 txAbort(tid, 0); 1396 goto out3; 1397 } 1398 1399 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { 1400 txAbort(tid, 0); 1401 goto out3; 1402 } 1403 1404 tblk = tid_to_tblock(tid); 1405 tblk->xflag |= COMMIT_CREATE; 1406 tblk->ino = ip->i_ino; 1407 tblk->u.ixpxd = JFS_IP(ip)->ixpxd; 1408 1409 ino = ip->i_ino; 1410 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { 1411 txAbort(tid, 0); 1412 goto out3; 1413 } 1414 1415 ip->i_op = &jfs_file_inode_operations; 1416 jfs_ip->dev = new_encode_dev(rdev); 1417 init_special_inode(ip, ip->i_mode, rdev); 1418 1419 mark_inode_dirty(ip); 1420 1421 inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir)); 1422 1423 mark_inode_dirty(dir); 1424 1425 iplist[0] = dir; 1426 iplist[1] = ip; 1427 rc = txCommit(tid, 2, iplist, 0); 1428 1429 out3: 1430 txEnd(tid); 1431 mutex_unlock(&JFS_IP(ip)->commit_mutex); 1432 mutex_unlock(&JFS_IP(dir)->commit_mutex); 1433 if (rc) { 1434 free_ea_wmap(ip); 1435 clear_nlink(ip); 1436 discard_new_inode(ip); 1437 } else { 1438 d_instantiate_new(dentry, ip); 1439 } 1440 1441 out1: 1442 free_UCSname(&dname); 1443 1444 out: 1445 jfs_info("jfs_mknod: returning %d", rc); 1446 return rc; 1447} 1448 1449static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags) 1450{ 1451 struct btstack btstack; 1452 ino_t inum; 1453 struct inode *ip; 1454 struct component_name key; 1455 int rc; 1456 1457 jfs_info("jfs_lookup: name = %pd", dentry); 1458 1459 if ((rc = get_UCSname(&key, dentry))) 1460 return ERR_PTR(rc); 1461 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); 1462 free_UCSname(&key); 1463 if (rc == -ENOENT) { 1464 ip = NULL; 1465 } else if (rc) { 1466 jfs_err("jfs_lookup: dtSearch returned %d", rc); 1467 ip = ERR_PTR(rc); 1468 } else { 1469 ip = jfs_iget(dip->i_sb, inum); 1470 if (IS_ERR(ip)) 1471 jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum); 1472 } 1473 1474 return d_splice_alias(ip, dentry); 1475} 1476 1477static struct inode *jfs_nfs_get_inode(struct super_block *sb, 1478 u64 ino, u32 generation) 1479{ 1480 struct inode *inode; 1481 1482 if (ino == 0) 1483 return ERR_PTR(-ESTALE); 1484 inode = jfs_iget(sb, ino); 1485 if (IS_ERR(inode)) 1486 return ERR_CAST(inode); 1487 1488 if (generation && inode->i_generation != generation) { 1489 iput(inode); 1490 return ERR_PTR(-ESTALE); 1491 } 1492 1493 return inode; 1494} 1495 1496struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid, 1497 int fh_len, int fh_type) 1498{ 1499 return generic_fh_to_dentry(sb, fid, fh_len, fh_type, 1500 jfs_nfs_get_inode); 1501} 1502 1503struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid, 1504 int fh_len, int fh_type) 1505{ 1506 return generic_fh_to_parent(sb, fid, fh_len, fh_type, 1507 jfs_nfs_get_inode); 1508} 1509 1510struct dentry *jfs_get_parent(struct dentry *dentry) 1511{ 1512 unsigned long parent_ino; 1513 1514 parent_ino = 1515 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot); 1516 1517 return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino)); 1518} 1519 1520const struct inode_operations jfs_dir_inode_operations = { 1521 .create = jfs_create, 1522 .lookup = jfs_lookup, 1523 .link = jfs_link, 1524 .unlink = jfs_unlink, 1525 .symlink = jfs_symlink, 1526 .mkdir = jfs_mkdir, 1527 .rmdir = jfs_rmdir, 1528 .mknod = jfs_mknod, 1529 .rename = jfs_rename, 1530 .listxattr = jfs_listxattr, 1531 .setattr = jfs_setattr, 1532 .fileattr_get = jfs_fileattr_get, 1533 .fileattr_set = jfs_fileattr_set, 1534#ifdef CONFIG_JFS_POSIX_ACL 1535 .get_inode_acl = jfs_get_acl, 1536 .set_acl = jfs_set_acl, 1537#endif 1538}; 1539 1540WRAP_DIR_ITER(jfs_readdir) // FIXME! 1541const struct file_operations jfs_dir_operations = { 1542 .read = generic_read_dir, 1543 .iterate_shared = shared_jfs_readdir, 1544 .fsync = jfs_fsync, 1545 .unlocked_ioctl = jfs_ioctl, 1546 .compat_ioctl = compat_ptr_ioctl, 1547 .llseek = generic_file_llseek, 1548}; 1549 1550static int jfs_ci_hash(const struct dentry *dir, struct qstr *this) 1551{ 1552 unsigned long hash; 1553 int i; 1554 1555 hash = init_name_hash(dir); 1556 for (i=0; i < this->len; i++) 1557 hash = partial_name_hash(tolower(this->name[i]), hash); 1558 this->hash = end_name_hash(hash); 1559 1560 return 0; 1561} 1562 1563static int jfs_ci_compare(const struct dentry *dentry, 1564 unsigned int len, const char *str, const struct qstr *name) 1565{ 1566 int i, result = 1; 1567 1568 if (len != name->len) 1569 goto out; 1570 for (i=0; i < len; i++) { 1571 if (tolower(str[i]) != tolower(name->name[i])) 1572 goto out; 1573 } 1574 result = 0; 1575out: 1576 return result; 1577} 1578 1579static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags) 1580{ 1581 /* 1582 * This is not negative dentry. Always valid. 1583 * 1584 * Note, rename() to existing directory entry will have ->d_inode, 1585 * and will use existing name which isn't specified name by user. 1586 * 1587 * We may be able to drop this positive dentry here. But dropping 1588 * positive dentry isn't good idea. So it's unsupported like 1589 * rename("filename", "FILENAME") for now. 1590 */ 1591 if (d_really_is_positive(dentry)) 1592 return 1; 1593 1594 /* 1595 * This may be nfsd (or something), anyway, we can't see the 1596 * intent of this. So, since this can be for creation, drop it. 1597 */ 1598 if (!flags) 1599 return 0; 1600 1601 /* 1602 * Drop the negative dentry, in order to make sure to use the 1603 * case sensitive name which is specified by user if this is 1604 * for creation. 1605 */ 1606 if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 1607 return 0; 1608 return 1; 1609} 1610 1611const struct dentry_operations jfs_ci_dentry_operations = 1612{ 1613 .d_hash = jfs_ci_hash, 1614 .d_compare = jfs_ci_compare, 1615 .d_revalidate = jfs_ci_revalidate, 1616}; 1617