fs/jfs/namei.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
free_ea_wmap
jfs_create
jfs_mkdir
jfs_rmdir
jfs_unlink
commitZeroLink
jfs_free_zero_link
jfs_link
jfs_symlink
jfs_rename
jfs_mknod
jfs_lookup
jfs_nfs_get_inode
jfs_fh_to_dentry
jfs_fh_to_parent
jfs_get_parent
jfs_ci_hash
jfs_ci_compare
jfs_ci_revalidate
   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  */
  26 const struct dentry_operations jfs_ci_dentry_operations;
  27 
  28 static 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  */
  36 static 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  */
  62 static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
  63                 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         dip->i_ctime = dip->i_mtime = current_time(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  */
 195 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
 196 {
 197         int rc = 0;
 198         tid_t tid;              /* transaction id */
 199         struct inode *ip = NULL;        /* child directory inode */
 200         ino_t ino;
 201         struct component_name dname;    /* child directory name */
 202         struct btstack btstack;
 203         struct inode *iplist[2];
 204         struct tblock *tblk;
 205 
 206         jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
 207 
 208         rc = dquot_initialize(dip);
 209         if (rc)
 210                 goto out1;
 211 
 212         /*
 213          * search parent directory for entry/freespace
 214          * (dtSearch() returns parent directory page pinned)
 215          */
 216         if ((rc = get_UCSname(&dname, dentry)))
 217                 goto out1;
 218 
 219         /*
 220          * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
 221          * block there while holding dtree page, so we allocate the inode &
 222          * begin the transaction before we search the directory.
 223          */
 224         ip = ialloc(dip, S_IFDIR | mode);
 225         if (IS_ERR(ip)) {
 226                 rc = PTR_ERR(ip);
 227                 goto out2;
 228         }
 229 
 230         tid = txBegin(dip->i_sb, 0);
 231 
 232         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 233         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 234 
 235         rc = jfs_init_acl(tid, ip, dip);
 236         if (rc)
 237                 goto out3;
 238 
 239         rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
 240         if (rc) {
 241                 txAbort(tid, 0);
 242                 goto out3;
 243         }
 244 
 245         if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
 246                 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
 247                 txAbort(tid, 0);
 248                 goto out3;
 249         }
 250 
 251         tblk = tid_to_tblock(tid);
 252         tblk->xflag |= COMMIT_CREATE;
 253         tblk->ino = ip->i_ino;
 254         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
 255 
 256         iplist[0] = dip;
 257         iplist[1] = ip;
 258 
 259         /*
 260          * initialize the child directory in-line in inode
 261          */
 262         dtInitRoot(tid, ip, dip->i_ino);
 263 
 264         /*
 265          * create entry in parent directory for child directory
 266          * (dtInsert() releases parent directory page)
 267          */
 268         ino = ip->i_ino;
 269         if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
 270                 if (rc == -EIO) {
 271                         jfs_err("jfs_mkdir: dtInsert returned -EIO");
 272                         txAbort(tid, 1);        /* Marks Filesystem dirty */
 273                 } else
 274                         txAbort(tid, 0);        /* Filesystem full */
 275                 goto out3;
 276         }
 277 
 278         set_nlink(ip, 2);       /* for '.' */
 279         ip->i_op = &jfs_dir_inode_operations;
 280         ip->i_fop = &jfs_dir_operations;
 281 
 282         mark_inode_dirty(ip);
 283 
 284         /* update parent directory inode */
 285         inc_nlink(dip);         /* for '..' from child directory */
 286         dip->i_ctime = dip->i_mtime = current_time(dip);
 287         mark_inode_dirty(dip);
 288 
 289         rc = txCommit(tid, 2, &iplist[0], 0);
 290 
 291       out3:
 292         txEnd(tid);
 293         mutex_unlock(&JFS_IP(ip)->commit_mutex);
 294         mutex_unlock(&JFS_IP(dip)->commit_mutex);
 295         if (rc) {
 296                 free_ea_wmap(ip);
 297                 clear_nlink(ip);
 298                 discard_new_inode(ip);
 299         } else {
 300                 d_instantiate_new(dentry, ip);
 301         }
 302 
 303       out2:
 304         free_UCSname(&dname);
 305 
 306 
 307       out1:
 308 
 309         jfs_info("jfs_mkdir: rc:%d", rc);
 310         return rc;
 311 }
 312 
 313 /*
 314  * NAME:        jfs_rmdir(dip, dentry)
 315  *
 316  * FUNCTION:    remove a link to child directory
 317  *
 318  * PARAMETER:   dip     - parent inode
 319  *              dentry  - child directory dentry
 320  *
 321  * RETURN:      -EINVAL - if name is . or ..
 322  *              -EINVAL - if . or .. exist but are invalid.
 323  *              errors from subroutines
 324  *
 325  * note:
 326  * if other threads have the directory open when the last link
 327  * is removed, the "." and ".." entries, if present, are removed before
 328  * rmdir() returns and no new entries may be created in the directory,
 329  * but the directory is not removed until the last reference to
 330  * the directory is released (cf.unlink() of regular file).
 331  */
 332 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
 333 {
 334         int rc;
 335         tid_t tid;              /* transaction id */
 336         struct inode *ip = d_inode(dentry);
 337         ino_t ino;
 338         struct component_name dname;
 339         struct inode *iplist[2];
 340         struct tblock *tblk;
 341 
 342         jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
 343 
 344         /* Init inode for quota operations. */
 345         rc = dquot_initialize(dip);
 346         if (rc)
 347                 goto out;
 348         rc = dquot_initialize(ip);
 349         if (rc)
 350                 goto out;
 351 
 352         /* directory must be empty to be removed */
 353         if (!dtEmpty(ip)) {
 354                 rc = -ENOTEMPTY;
 355                 goto out;
 356         }
 357 
 358         if ((rc = get_UCSname(&dname, dentry))) {
 359                 goto out;
 360         }
 361 
 362         tid = txBegin(dip->i_sb, 0);
 363 
 364         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 365         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 366 
 367         iplist[0] = dip;
 368         iplist[1] = ip;
 369 
 370         tblk = tid_to_tblock(tid);
 371         tblk->xflag |= COMMIT_DELETE;
 372         tblk->u.ip = ip;
 373 
 374         /*
 375          * delete the entry of target directory from parent directory
 376          */
 377         ino = ip->i_ino;
 378         if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
 379                 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
 380                 if (rc == -EIO)
 381                         txAbort(tid, 1);
 382                 txEnd(tid);
 383                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
 384                 mutex_unlock(&JFS_IP(dip)->commit_mutex);
 385 
 386                 goto out2;
 387         }
 388 
 389         /* update parent directory's link count corresponding
 390          * to ".." entry of the target directory deleted
 391          */
 392         dip->i_ctime = dip->i_mtime = current_time(dip);
 393         inode_dec_link_count(dip);
 394 
 395         /*
 396          * OS/2 could have created EA and/or ACL
 397          */
 398         /* free EA from both persistent and working map */
 399         if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
 400                 /* free EA pages */
 401                 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
 402         }
 403         JFS_IP(ip)->ea.flag = 0;
 404 
 405         /* free ACL from both persistent and working map */
 406         if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
 407                 /* free ACL pages */
 408                 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
 409         }
 410         JFS_IP(ip)->acl.flag = 0;
 411 
 412         /* mark the target directory as deleted */
 413         clear_nlink(ip);
 414         mark_inode_dirty(ip);
 415 
 416         rc = txCommit(tid, 2, &iplist[0], 0);
 417 
 418         txEnd(tid);
 419 
 420         mutex_unlock(&JFS_IP(ip)->commit_mutex);
 421         mutex_unlock(&JFS_IP(dip)->commit_mutex);
 422 
 423         /*
 424          * Truncating the directory index table is not guaranteed.  It
 425          * may need to be done iteratively
 426          */
 427         if (test_cflag(COMMIT_Stale, dip)) {
 428                 if (dip->i_size > 1)
 429                         jfs_truncate_nolock(dip, 0);
 430 
 431                 clear_cflag(COMMIT_Stale, dip);
 432         }
 433 
 434       out2:
 435         free_UCSname(&dname);
 436 
 437       out:
 438         jfs_info("jfs_rmdir: rc:%d", rc);
 439         return rc;
 440 }
 441 
 442 /*
 443  * NAME:        jfs_unlink(dip, dentry)
 444  *
 445  * FUNCTION:    remove a link to object <vp> named by <name>
 446  *              from parent directory <dvp>
 447  *
 448  * PARAMETER:   dip     - inode of parent directory
 449  *              dentry  - dentry of object to be removed
 450  *
 451  * RETURN:      errors from subroutines
 452  *
 453  * note:
 454  * temporary file: if one or more processes have the file open
 455  * when the last link is removed, the link will be removed before
 456  * unlink() returns, but the removal of the file contents will be
 457  * postponed until all references to the files are closed.
 458  *
 459  * JFS does NOT support unlink() on directories.
 460  *
 461  */
 462 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
 463 {
 464         int rc;
 465         tid_t tid;              /* transaction id */
 466         struct inode *ip = d_inode(dentry);
 467         ino_t ino;
 468         struct component_name dname;    /* object name */
 469         struct inode *iplist[2];
 470         struct tblock *tblk;
 471         s64 new_size = 0;
 472         int commit_flag;
 473 
 474         jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
 475 
 476         /* Init inode for quota operations. */
 477         rc = dquot_initialize(dip);
 478         if (rc)
 479                 goto out;
 480         rc = dquot_initialize(ip);
 481         if (rc)
 482                 goto out;
 483 
 484         if ((rc = get_UCSname(&dname, dentry)))
 485                 goto out;
 486 
 487         IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
 488 
 489         tid = txBegin(dip->i_sb, 0);
 490 
 491         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 492         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 493 
 494         iplist[0] = dip;
 495         iplist[1] = ip;
 496 
 497         /*
 498          * delete the entry of target file from parent directory
 499          */
 500         ino = ip->i_ino;
 501         if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
 502                 jfs_err("jfs_unlink: dtDelete returned %d", rc);
 503                 if (rc == -EIO)
 504                         txAbort(tid, 1);        /* Marks FS Dirty */
 505                 txEnd(tid);
 506                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
 507                 mutex_unlock(&JFS_IP(dip)->commit_mutex);
 508                 IWRITE_UNLOCK(ip);
 509                 goto out1;
 510         }
 511 
 512         ASSERT(ip->i_nlink);
 513 
 514         ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip);
 515         mark_inode_dirty(dip);
 516 
 517         /* update target's inode */
 518         inode_dec_link_count(ip);
 519 
 520         /*
 521          *      commit zero link count object
 522          */
 523         if (ip->i_nlink == 0) {
 524                 assert(!test_cflag(COMMIT_Nolink, ip));
 525                 /* free block resources */
 526                 if ((new_size = commitZeroLink(tid, ip)) < 0) {
 527                         txAbort(tid, 1);        /* Marks FS Dirty */
 528                         txEnd(tid);
 529                         mutex_unlock(&JFS_IP(ip)->commit_mutex);
 530                         mutex_unlock(&JFS_IP(dip)->commit_mutex);
 531                         IWRITE_UNLOCK(ip);
 532                         rc = new_size;
 533                         goto out1;
 534                 }
 535                 tblk = tid_to_tblock(tid);
 536                 tblk->xflag |= COMMIT_DELETE;
 537                 tblk->u.ip = ip;
 538         }
 539 
 540         /*
 541          * Incomplete truncate of file data can
 542          * result in timing problems unless we synchronously commit the
 543          * transaction.
 544          */
 545         if (new_size)
 546                 commit_flag = COMMIT_SYNC;
 547         else
 548                 commit_flag = 0;
 549 
 550         /*
 551          * If xtTruncate was incomplete, commit synchronously to avoid
 552          * timing complications
 553          */
 554         rc = txCommit(tid, 2, &iplist[0], commit_flag);
 555 
 556         txEnd(tid);
 557 
 558         mutex_unlock(&JFS_IP(ip)->commit_mutex);
 559         mutex_unlock(&JFS_IP(dip)->commit_mutex);
 560 
 561         while (new_size && (rc == 0)) {
 562                 tid = txBegin(dip->i_sb, 0);
 563                 mutex_lock(&JFS_IP(ip)->commit_mutex);
 564                 new_size = xtTruncate_pmap(tid, ip, new_size);
 565                 if (new_size < 0) {
 566                         txAbort(tid, 1);        /* Marks FS Dirty */
 567                         rc = new_size;
 568                 } else
 569                         rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
 570                 txEnd(tid);
 571                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
 572         }
 573 
 574         if (ip->i_nlink == 0)
 575                 set_cflag(COMMIT_Nolink, ip);
 576 
 577         IWRITE_UNLOCK(ip);
 578 
 579         /*
 580          * Truncating the directory index table is not guaranteed.  It
 581          * may need to be done iteratively
 582          */
 583         if (test_cflag(COMMIT_Stale, dip)) {
 584                 if (dip->i_size > 1)
 585                         jfs_truncate_nolock(dip, 0);
 586 
 587                 clear_cflag(COMMIT_Stale, dip);
 588         }
 589 
 590       out1:
 591         free_UCSname(&dname);
 592       out:
 593         jfs_info("jfs_unlink: rc:%d", rc);
 594         return rc;
 595 }
 596 
 597 /*
 598  * NAME:        commitZeroLink()
 599  *
 600  * FUNCTION:    for non-directory, called by jfs_remove(),
 601  *              truncate a regular file, directory or symbolic
 602  *              link to zero length. return 0 if type is not
 603  *              one of these.
 604  *
 605  *              if the file is currently associated with a VM segment
 606  *              only permanent disk and inode map resources are freed,
 607  *              and neither the inode nor indirect blocks are modified
 608  *              so that the resources can be later freed in the work
 609  *              map by ctrunc1.
 610  *              if there is no VM segment on entry, the resources are
 611  *              freed in both work and permanent map.
 612  *              (? for temporary file - memory object is cached even
 613  *              after no reference:
 614  *              reference count > 0 -   )
 615  *
 616  * PARAMETERS:  cd      - pointer to commit data structure.
 617  *                        current inode is the one to truncate.
 618  *
 619  * RETURN:      Errors from subroutines
 620  */
 621 static s64 commitZeroLink(tid_t tid, struct inode *ip)
 622 {
 623         int filetype;
 624         struct tblock *tblk;
 625 
 626         jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
 627 
 628         filetype = ip->i_mode & S_IFMT;
 629         switch (filetype) {
 630         case S_IFREG:
 631                 break;
 632         case S_IFLNK:
 633                 /* fast symbolic link */
 634                 if (ip->i_size < IDATASIZE) {
 635                         ip->i_size = 0;
 636                         return 0;
 637                 }
 638                 break;
 639         default:
 640                 assert(filetype != S_IFDIR);
 641                 return 0;
 642         }
 643 
 644         set_cflag(COMMIT_Freewmap, ip);
 645 
 646         /* mark transaction of block map update type */
 647         tblk = tid_to_tblock(tid);
 648         tblk->xflag |= COMMIT_PMAP;
 649 
 650         /*
 651          * free EA
 652          */
 653         if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
 654                 /* acquire maplock on EA to be freed from block map */
 655                 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
 656 
 657         /*
 658          * free ACL
 659          */
 660         if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
 661                 /* acquire maplock on EA to be freed from block map */
 662                 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
 663 
 664         /*
 665          * free xtree/data (truncate to zero length):
 666          * free xtree/data pages from cache if COMMIT_PWMAP,
 667          * free xtree/data blocks from persistent block map, and
 668          * free xtree/data blocks from working block map if COMMIT_PWMAP;
 669          */
 670         if (ip->i_size)
 671                 return xtTruncate_pmap(tid, ip, 0);
 672 
 673         return 0;
 674 }
 675 
 676 
 677 /*
 678  * NAME:        jfs_free_zero_link()
 679  *
 680  * FUNCTION:    for non-directory, called by iClose(),
 681  *              free resources of a file from cache and WORKING map
 682  *              for a file previously committed with zero link count
 683  *              while associated with a pager object,
 684  *
 685  * PARAMETER:   ip      - pointer to inode of file.
 686  */
 687 void jfs_free_zero_link(struct inode *ip)
 688 {
 689         int type;
 690 
 691         jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
 692 
 693         /* return if not reg or symbolic link or if size is
 694          * already ok.
 695          */
 696         type = ip->i_mode & S_IFMT;
 697 
 698         switch (type) {
 699         case S_IFREG:
 700                 break;
 701         case S_IFLNK:
 702                 /* if its contained in inode nothing to do */
 703                 if (ip->i_size < IDATASIZE)
 704                         return;
 705                 break;
 706         default:
 707                 return;
 708         }
 709 
 710         /*
 711          * free EA
 712          */
 713         if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
 714                 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
 715                 int xlen = lengthDXD(&JFS_IP(ip)->ea);
 716                 struct maplock maplock; /* maplock for COMMIT_WMAP */
 717                 struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
 718 
 719                 /* free EA pages from cache */
 720                 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
 721 
 722                 /* free EA extent from working block map */
 723                 maplock.index = 1;
 724                 pxdlock = (struct pxd_lock *) & maplock;
 725                 pxdlock->flag = mlckFREEPXD;
 726                 PXDaddress(&pxdlock->pxd, xaddr);
 727                 PXDlength(&pxdlock->pxd, xlen);
 728                 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
 729         }
 730 
 731         /*
 732          * free ACL
 733          */
 734         if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
 735                 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
 736                 int xlen = lengthDXD(&JFS_IP(ip)->acl);
 737                 struct maplock maplock; /* maplock for COMMIT_WMAP */
 738                 struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
 739 
 740                 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
 741 
 742                 /* free ACL extent from working block map */
 743                 maplock.index = 1;
 744                 pxdlock = (struct pxd_lock *) & maplock;
 745                 pxdlock->flag = mlckFREEPXD;
 746                 PXDaddress(&pxdlock->pxd, xaddr);
 747                 PXDlength(&pxdlock->pxd, xlen);
 748                 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
 749         }
 750 
 751         /*
 752          * free xtree/data (truncate to zero length):
 753          * free xtree/data pages from cache, and
 754          * free xtree/data blocks from working block map;
 755          */
 756         if (ip->i_size)
 757                 xtTruncate(0, ip, 0, COMMIT_WMAP);
 758 }
 759 
 760 /*
 761  * NAME:        jfs_link(vp, dvp, name, crp)
 762  *
 763  * FUNCTION:    create a link to <vp> by the name = <name>
 764  *              in the parent directory <dvp>
 765  *
 766  * PARAMETER:   vp      - target object
 767  *              dvp     - parent directory of new link
 768  *              name    - name of new link to target object
 769  *              crp     - credential
 770  *
 771  * RETURN:      Errors from subroutines
 772  *
 773  * note:
 774  * JFS does NOT support link() on directories (to prevent circular
 775  * path in the directory hierarchy);
 776  * EPERM: the target object is a directory, and either the caller
 777  * does not have appropriate privileges or the implementation prohibits
 778  * using link() on directories [XPG4.2].
 779  *
 780  * JFS does NOT support links between file systems:
 781  * EXDEV: target object and new link are on different file systems and
 782  * implementation does not support links between file systems [XPG4.2].
 783  */
 784 static int jfs_link(struct dentry *old_dentry,
 785              struct inode *dir, struct dentry *dentry)
 786 {
 787         int rc;
 788         tid_t tid;
 789         struct inode *ip = d_inode(old_dentry);
 790         ino_t ino;
 791         struct component_name dname;
 792         struct btstack btstack;
 793         struct inode *iplist[2];
 794 
 795         jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
 796 
 797         rc = dquot_initialize(dir);
 798         if (rc)
 799                 goto out;
 800 
 801         tid = txBegin(ip->i_sb, 0);
 802 
 803         mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
 804         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 805 
 806         /*
 807          * scan parent directory for entry/freespace
 808          */
 809         if ((rc = get_UCSname(&dname, dentry)))
 810                 goto out_tx;
 811 
 812         if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
 813                 goto free_dname;
 814 
 815         /*
 816          * create entry for new link in parent directory
 817          */
 818         ino = ip->i_ino;
 819         if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
 820                 goto free_dname;
 821 
 822         /* update object inode */
 823         inc_nlink(ip);          /* for new link */
 824         ip->i_ctime = current_time(ip);
 825         dir->i_ctime = dir->i_mtime = current_time(dir);
 826         mark_inode_dirty(dir);
 827         ihold(ip);
 828 
 829         iplist[0] = ip;
 830         iplist[1] = dir;
 831         rc = txCommit(tid, 2, &iplist[0], 0);
 832 
 833         if (rc) {
 834                 drop_nlink(ip); /* never instantiated */
 835                 iput(ip);
 836         } else
 837                 d_instantiate(dentry, ip);
 838 
 839       free_dname:
 840         free_UCSname(&dname);
 841 
 842       out_tx:
 843         txEnd(tid);
 844 
 845         mutex_unlock(&JFS_IP(ip)->commit_mutex);
 846         mutex_unlock(&JFS_IP(dir)->commit_mutex);
 847 
 848       out:
 849         jfs_info("jfs_link: rc:%d", rc);
 850         return rc;
 851 }
 852 
 853 /*
 854  * NAME:        jfs_symlink(dip, dentry, name)
 855  *
 856  * FUNCTION:    creates a symbolic link to <symlink> by name <name>
 857  *                      in directory <dip>
 858  *
 859  * PARAMETER:   dip     - parent directory vnode
 860  *              dentry  - dentry of symbolic link
 861  *              name    - the path name of the existing object
 862  *                        that will be the source of the link
 863  *
 864  * RETURN:      errors from subroutines
 865  *
 866  * note:
 867  * ENAMETOOLONG: pathname resolution of a symbolic link produced
 868  * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
 869 */
 870 
 871 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
 872                 const char *name)
 873 {
 874         int rc;
 875         tid_t tid;
 876         ino_t ino = 0;
 877         struct component_name dname;
 878         int ssize;              /* source pathname size */
 879         struct btstack btstack;
 880         struct inode *ip = d_inode(dentry);
 881         s64 xlen = 0;
 882         int bmask = 0, xsize;
 883         s64 xaddr;
 884         struct metapage *mp;
 885         struct super_block *sb;
 886         struct tblock *tblk;
 887 
 888         struct inode *iplist[2];
 889 
 890         jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
 891 
 892         rc = dquot_initialize(dip);
 893         if (rc)
 894                 goto out1;
 895 
 896         ssize = strlen(name) + 1;
 897 
 898         /*
 899          * search parent directory for entry/freespace
 900          * (dtSearch() returns parent directory page pinned)
 901          */
 902 
 903         if ((rc = get_UCSname(&dname, dentry)))
 904                 goto out1;
 905 
 906         /*
 907          * allocate on-disk/in-memory inode for symbolic link:
 908          * (iAlloc() returns new, locked inode)
 909          */
 910         ip = ialloc(dip, S_IFLNK | 0777);
 911         if (IS_ERR(ip)) {
 912                 rc = PTR_ERR(ip);
 913                 goto out2;
 914         }
 915 
 916         tid = txBegin(dip->i_sb, 0);
 917 
 918         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 919         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 920 
 921         rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
 922         if (rc)
 923                 goto out3;
 924 
 925         tblk = tid_to_tblock(tid);
 926         tblk->xflag |= COMMIT_CREATE;
 927         tblk->ino = ip->i_ino;
 928         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
 929 
 930         /* fix symlink access permission
 931          * (dir_create() ANDs in the u.u_cmask,
 932          * but symlinks really need to be 777 access)
 933          */
 934         ip->i_mode |= 0777;
 935 
 936         /*
 937          * write symbolic link target path name
 938          */
 939         xtInitRoot(tid, ip);
 940 
 941         /*
 942          * write source path name inline in on-disk inode (fast symbolic link)
 943          */
 944 
 945         if (ssize <= IDATASIZE) {
 946                 ip->i_op = &jfs_fast_symlink_inode_operations;
 947 
 948                 ip->i_link = JFS_IP(ip)->i_inline;
 949                 memcpy(ip->i_link, name, ssize);
 950                 ip->i_size = ssize - 1;
 951 
 952                 /*
 953                  * if symlink is > 128 bytes, we don't have the space to
 954                  * store inline extended attributes
 955                  */
 956                 if (ssize > sizeof (JFS_IP(ip)->i_inline))
 957                         JFS_IP(ip)->mode2 &= ~INLINEEA;
 958 
 959                 jfs_info("jfs_symlink: fast symlink added  ssize:%d name:%s ",
 960                          ssize, name);
 961         }
 962         /*
 963          * write source path name in a single extent
 964          */
 965         else {
 966                 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
 967 
 968                 ip->i_op = &jfs_symlink_inode_operations;
 969                 inode_nohighmem(ip);
 970                 ip->i_mapping->a_ops = &jfs_aops;
 971 
 972                 /*
 973                  * even though the data of symlink object (source
 974                  * path name) is treated as non-journaled user data,
 975                  * it is read/written thru buffer cache for performance.
 976                  */
 977                 sb = ip->i_sb;
 978                 bmask = JFS_SBI(sb)->bsize - 1;
 979                 xsize = (ssize + bmask) & ~bmask;
 980                 xaddr = 0;
 981                 xlen = xsize >> JFS_SBI(sb)->l2bsize;
 982                 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
 983                         txAbort(tid, 0);
 984                         goto out3;
 985                 }
 986                 ip->i_size = ssize - 1;
 987                 while (ssize) {
 988                         /* This is kind of silly since PATH_MAX == 4K */
 989                         int copy_size = min(ssize, PSIZE);
 990 
 991                         mp = get_metapage(ip, xaddr, PSIZE, 1);
 992 
 993                         if (mp == NULL) {
 994                                 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
 995                                 rc = -EIO;
 996                                 txAbort(tid, 0);
 997                                 goto out3;
 998                         }
 999                         memcpy(mp->data, name, copy_size);
1000                         flush_metapage(mp);
1001                         ssize -= copy_size;
1002                         name += copy_size;
1003                         xaddr += JFS_SBI(sb)->nbperpage;
1004                 }
1005         }
1006 
1007         /*
1008          * create entry for symbolic link in parent directory
1009          */
1010         rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1011         if (rc == 0) {
1012                 ino = ip->i_ino;
1013                 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1014         }
1015         if (rc) {
1016                 if (xlen)
1017                         xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1018                 txAbort(tid, 0);
1019                 /* discard new inode */
1020                 goto out3;
1021         }
1022 
1023         mark_inode_dirty(ip);
1024 
1025         dip->i_ctime = dip->i_mtime = current_time(dip);
1026         mark_inode_dirty(dip);
1027         /*
1028          * commit update of parent directory and link object
1029          */
1030 
1031         iplist[0] = dip;
1032         iplist[1] = ip;
1033         rc = txCommit(tid, 2, &iplist[0], 0);
1034 
1035       out3:
1036         txEnd(tid);
1037         mutex_unlock(&JFS_IP(ip)->commit_mutex);
1038         mutex_unlock(&JFS_IP(dip)->commit_mutex);
1039         if (rc) {
1040                 free_ea_wmap(ip);
1041                 clear_nlink(ip);
1042                 discard_new_inode(ip);
1043         } else {
1044                 d_instantiate_new(dentry, ip);
1045         }
1046 
1047       out2:
1048         free_UCSname(&dname);
1049 
1050       out1:
1051         jfs_info("jfs_symlink: rc:%d", rc);
1052         return rc;
1053 }
1054 
1055 
1056 /*
1057  * NAME:        jfs_rename
1058  *
1059  * FUNCTION:    rename a file or directory
1060  */
1061 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1062                       struct inode *new_dir, struct dentry *new_dentry,
1063                       unsigned int flags)
1064 {
1065         struct btstack btstack;
1066         ino_t ino;
1067         struct component_name new_dname;
1068         struct inode *new_ip;
1069         struct component_name old_dname;
1070         struct inode *old_ip;
1071         int rc;
1072         tid_t tid;
1073         struct tlock *tlck;
1074         struct dt_lock *dtlck;
1075         struct lv *lv;
1076         int ipcount;
1077         struct inode *iplist[4];
1078         struct tblock *tblk;
1079         s64 new_size = 0;
1080         int commit_flag;
1081 
1082         if (flags & ~RENAME_NOREPLACE)
1083                 return -EINVAL;
1084 
1085         jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1086 
1087         rc = dquot_initialize(old_dir);
1088         if (rc)
1089                 goto out1;
1090         rc = dquot_initialize(new_dir);
1091         if (rc)
1092                 goto out1;
1093 
1094         old_ip = d_inode(old_dentry);
1095         new_ip = d_inode(new_dentry);
1096 
1097         if ((rc = get_UCSname(&old_dname, old_dentry)))
1098                 goto out1;
1099 
1100         if ((rc = get_UCSname(&new_dname, new_dentry)))
1101                 goto out2;
1102 
1103         /*
1104          * Make sure source inode number is what we think it is
1105          */
1106         rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1107         if (rc || (ino != old_ip->i_ino)) {
1108                 rc = -ENOENT;
1109                 goto out3;
1110         }
1111 
1112         /*
1113          * Make sure dest inode number (if any) is what we think it is
1114          */
1115         rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1116         if (!rc) {
1117                 if ((!new_ip) || (ino != new_ip->i_ino)) {
1118                         rc = -ESTALE;
1119                         goto out3;
1120                 }
1121         } else if (rc != -ENOENT)
1122                 goto out3;
1123         else if (new_ip) {
1124                 /* no entry exists, but one was expected */
1125                 rc = -ESTALE;
1126                 goto out3;
1127         }
1128 
1129         if (S_ISDIR(old_ip->i_mode)) {
1130                 if (new_ip) {
1131                         if (!dtEmpty(new_ip)) {
1132                                 rc = -ENOTEMPTY;
1133                                 goto out3;
1134                         }
1135                 }
1136         } else if (new_ip) {
1137                 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1138                 /* Init inode for quota operations. */
1139                 rc = dquot_initialize(new_ip);
1140                 if (rc)
1141                         goto out_unlock;
1142         }
1143 
1144         /*
1145          * The real work starts here
1146          */
1147         tid = txBegin(new_dir->i_sb, 0);
1148 
1149         /*
1150          * How do we know the locking is safe from deadlocks?
1151          * The vfs does the hard part for us.  Any time we are taking nested
1152          * commit_mutexes, the vfs already has i_mutex held on the parent.
1153          * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1154          */
1155         mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1156         mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1157         if (old_dir != new_dir)
1158                 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1159                                   COMMIT_MUTEX_SECOND_PARENT);
1160 
1161         if (new_ip) {
1162                 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1163                                   COMMIT_MUTEX_VICTIM);
1164                 /*
1165                  * Change existing directory entry to new inode number
1166                  */
1167                 ino = new_ip->i_ino;
1168                 rc = dtModify(tid, new_dir, &new_dname, &ino,
1169                               old_ip->i_ino, JFS_RENAME);
1170                 if (rc)
1171                         goto out_tx;
1172                 drop_nlink(new_ip);
1173                 if (S_ISDIR(new_ip->i_mode)) {
1174                         drop_nlink(new_ip);
1175                         if (new_ip->i_nlink) {
1176                                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1177                                 if (old_dir != new_dir)
1178                                         mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1179                                 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1180                                 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1181                                 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1182                                         IWRITE_UNLOCK(new_ip);
1183                                 jfs_error(new_ip->i_sb,
1184                                           "new_ip->i_nlink != 0\n");
1185                                 return -EIO;
1186                         }
1187                         tblk = tid_to_tblock(tid);
1188                         tblk->xflag |= COMMIT_DELETE;
1189                         tblk->u.ip = new_ip;
1190                 } else if (new_ip->i_nlink == 0) {
1191                         assert(!test_cflag(COMMIT_Nolink, new_ip));
1192                         /* free block resources */
1193                         if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1194                                 txAbort(tid, 1);        /* Marks FS Dirty */
1195                                 rc = new_size;
1196                                 goto out_tx;
1197                         }
1198                         tblk = tid_to_tblock(tid);
1199                         tblk->xflag |= COMMIT_DELETE;
1200                         tblk->u.ip = new_ip;
1201                 } else {
1202                         new_ip->i_ctime = current_time(new_ip);
1203                         mark_inode_dirty(new_ip);
1204                 }
1205         } else {
1206                 /*
1207                  * Add new directory entry
1208                  */
1209                 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1210                               JFS_CREATE);
1211                 if (rc) {
1212                         jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1213                                 rc);
1214                         goto out_tx;
1215                 }
1216 
1217                 ino = old_ip->i_ino;
1218                 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1219                 if (rc) {
1220                         if (rc == -EIO)
1221                                 jfs_err("jfs_rename: dtInsert returned -EIO");
1222                         goto out_tx;
1223                 }
1224                 if (S_ISDIR(old_ip->i_mode))
1225                         inc_nlink(new_dir);
1226         }
1227         /*
1228          * Remove old directory entry
1229          */
1230 
1231         ino = old_ip->i_ino;
1232         rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1233         if (rc) {
1234                 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1235                         rc);
1236                 txAbort(tid, 1);        /* Marks Filesystem dirty */
1237                 goto out_tx;
1238         }
1239         if (S_ISDIR(old_ip->i_mode)) {
1240                 drop_nlink(old_dir);
1241                 if (old_dir != new_dir) {
1242                         /*
1243                          * Change inode number of parent for moved directory
1244                          */
1245 
1246                         JFS_IP(old_ip)->i_dtroot.header.idotdot =
1247                                 cpu_to_le32(new_dir->i_ino);
1248 
1249                         /* Linelock header of dtree */
1250                         tlck = txLock(tid, old_ip,
1251                                     (struct metapage *) &JFS_IP(old_ip)->bxflag,
1252                                       tlckDTREE | tlckBTROOT | tlckRELINK);
1253                         dtlck = (struct dt_lock *) & tlck->lock;
1254                         ASSERT(dtlck->index == 0);
1255                         lv = & dtlck->lv[0];
1256                         lv->offset = 0;
1257                         lv->length = 1;
1258                         dtlck->index++;
1259                 }
1260         }
1261 
1262         /*
1263          * Update ctime on changed/moved inodes & mark dirty
1264          */
1265         old_ip->i_ctime = current_time(old_ip);
1266         mark_inode_dirty(old_ip);
1267 
1268         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1269         mark_inode_dirty(new_dir);
1270 
1271         /* Build list of inodes modified by this transaction */
1272         ipcount = 0;
1273         iplist[ipcount++] = old_ip;
1274         if (new_ip)
1275                 iplist[ipcount++] = new_ip;
1276         iplist[ipcount++] = old_dir;
1277 
1278         if (old_dir != new_dir) {
1279                 iplist[ipcount++] = new_dir;
1280                 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1281                 mark_inode_dirty(old_dir);
1282         }
1283 
1284         /*
1285          * Incomplete truncate of file data can
1286          * result in timing problems unless we synchronously commit the
1287          * transaction.
1288          */
1289         if (new_size)
1290                 commit_flag = COMMIT_SYNC;
1291         else
1292                 commit_flag = 0;
1293 
1294         rc = txCommit(tid, ipcount, iplist, commit_flag);
1295 
1296       out_tx:
1297         txEnd(tid);
1298         if (new_ip)
1299                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1300         if (old_dir != new_dir)
1301                 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1302         mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1303         mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1304 
1305         while (new_size && (rc == 0)) {
1306                 tid = txBegin(new_ip->i_sb, 0);
1307                 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1308                 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1309                 if (new_size < 0) {
1310                         txAbort(tid, 1);
1311                         rc = new_size;
1312                 } else
1313                         rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1314                 txEnd(tid);
1315                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1316         }
1317         if (new_ip && (new_ip->i_nlink == 0))
1318                 set_cflag(COMMIT_Nolink, new_ip);
1319         /*
1320          * Truncating the directory index table is not guaranteed.  It
1321          * may need to be done iteratively
1322          */
1323         if (test_cflag(COMMIT_Stale, old_dir)) {
1324                 if (old_dir->i_size > 1)
1325                         jfs_truncate_nolock(old_dir, 0);
1326 
1327                 clear_cflag(COMMIT_Stale, old_dir);
1328         }
1329       out_unlock:
1330         if (new_ip && !S_ISDIR(new_ip->i_mode))
1331                 IWRITE_UNLOCK(new_ip);
1332       out3:
1333         free_UCSname(&new_dname);
1334       out2:
1335         free_UCSname(&old_dname);
1336       out1:
1337         jfs_info("jfs_rename: returning %d", rc);
1338         return rc;
1339 }
1340 
1341 
1342 /*
1343  * NAME:        jfs_mknod
1344  *
1345  * FUNCTION:    Create a special file (device)
1346  */
1347 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1348                 umode_t mode, dev_t rdev)
1349 {
1350         struct jfs_inode_info *jfs_ip;
1351         struct btstack btstack;
1352         struct component_name dname;
1353         ino_t ino;
1354         struct inode *ip;
1355         struct inode *iplist[2];
1356         int rc;
1357         tid_t tid;
1358         struct tblock *tblk;
1359 
1360         jfs_info("jfs_mknod: %pd", dentry);
1361 
1362         rc = dquot_initialize(dir);
1363         if (rc)
1364                 goto out;
1365 
1366         if ((rc = get_UCSname(&dname, dentry)))
1367                 goto out;
1368 
1369         ip = ialloc(dir, mode);
1370         if (IS_ERR(ip)) {
1371                 rc = PTR_ERR(ip);
1372                 goto out1;
1373         }
1374         jfs_ip = JFS_IP(ip);
1375 
1376         tid = txBegin(dir->i_sb, 0);
1377 
1378         mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1379         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1380 
1381         rc = jfs_init_acl(tid, ip, dir);
1382         if (rc)
1383                 goto out3;
1384 
1385         rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1386         if (rc) {
1387                 txAbort(tid, 0);
1388                 goto out3;
1389         }
1390 
1391         if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1392                 txAbort(tid, 0);
1393                 goto out3;
1394         }
1395 
1396         tblk = tid_to_tblock(tid);
1397         tblk->xflag |= COMMIT_CREATE;
1398         tblk->ino = ip->i_ino;
1399         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1400 
1401         ino = ip->i_ino;
1402         if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1403                 txAbort(tid, 0);
1404                 goto out3;
1405         }
1406 
1407         ip->i_op = &jfs_file_inode_operations;
1408         jfs_ip->dev = new_encode_dev(rdev);
1409         init_special_inode(ip, ip->i_mode, rdev);
1410 
1411         mark_inode_dirty(ip);
1412 
1413         dir->i_ctime = dir->i_mtime = current_time(dir);
1414 
1415         mark_inode_dirty(dir);
1416 
1417         iplist[0] = dir;
1418         iplist[1] = ip;
1419         rc = txCommit(tid, 2, iplist, 0);
1420 
1421       out3:
1422         txEnd(tid);
1423         mutex_unlock(&JFS_IP(ip)->commit_mutex);
1424         mutex_unlock(&JFS_IP(dir)->commit_mutex);
1425         if (rc) {
1426                 free_ea_wmap(ip);
1427                 clear_nlink(ip);
1428                 discard_new_inode(ip);
1429         } else {
1430                 d_instantiate_new(dentry, ip);
1431         }
1432 
1433       out1:
1434         free_UCSname(&dname);
1435 
1436       out:
1437         jfs_info("jfs_mknod: returning %d", rc);
1438         return rc;
1439 }
1440 
1441 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1442 {
1443         struct btstack btstack;
1444         ino_t inum;
1445         struct inode *ip;
1446         struct component_name key;
1447         int rc;
1448 
1449         jfs_info("jfs_lookup: name = %pd", dentry);
1450 
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                 ip = NULL;
1457         } else if (rc) {
1458                 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1459                 ip = ERR_PTR(rc);
1460         } else {
1461                 ip = jfs_iget(dip->i_sb, inum);
1462                 if (IS_ERR(ip))
1463                         jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1464         }
1465 
1466         return d_splice_alias(ip, dentry);
1467 }
1468 
1469 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1470                 u64 ino, u32 generation)
1471 {
1472         struct inode *inode;
1473 
1474         if (ino == 0)
1475                 return ERR_PTR(-ESTALE);
1476         inode = jfs_iget(sb, ino);
1477         if (IS_ERR(inode))
1478                 return ERR_CAST(inode);
1479 
1480         if (generation && inode->i_generation != generation) {
1481                 iput(inode);
1482                 return ERR_PTR(-ESTALE);
1483         }
1484 
1485         return inode;
1486 }
1487 
1488 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1489                 int fh_len, int fh_type)
1490 {
1491         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1492                                     jfs_nfs_get_inode);
1493 }
1494 
1495 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1496                 int fh_len, int fh_type)
1497 {
1498         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1499                                     jfs_nfs_get_inode);
1500 }
1501 
1502 struct dentry *jfs_get_parent(struct dentry *dentry)
1503 {
1504         unsigned long parent_ino;
1505 
1506         parent_ino =
1507                 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1508 
1509         return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1510 }
1511 
1512 const struct inode_operations jfs_dir_inode_operations = {
1513         .create         = jfs_create,
1514         .lookup         = jfs_lookup,
1515         .link           = jfs_link,
1516         .unlink         = jfs_unlink,
1517         .symlink        = jfs_symlink,
1518         .mkdir          = jfs_mkdir,
1519         .rmdir          = jfs_rmdir,
1520         .mknod          = jfs_mknod,
1521         .rename         = jfs_rename,
1522         .listxattr      = jfs_listxattr,
1523         .setattr        = jfs_setattr,
1524 #ifdef CONFIG_JFS_POSIX_ACL
1525         .get_acl        = jfs_get_acl,
1526         .set_acl        = jfs_set_acl,
1527 #endif
1528 };
1529 
1530 const struct file_operations jfs_dir_operations = {
1531         .read           = generic_read_dir,
1532         .iterate        = jfs_readdir,
1533         .fsync          = jfs_fsync,
1534         .unlocked_ioctl = jfs_ioctl,
1535 #ifdef CONFIG_COMPAT
1536         .compat_ioctl   = jfs_compat_ioctl,
1537 #endif
1538         .llseek         = generic_file_llseek,
1539 };
1540 
1541 static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1542 {
1543         unsigned long hash;
1544         int i;
1545 
1546         hash = init_name_hash(dir);
1547         for (i=0; i < this->len; i++)
1548                 hash = partial_name_hash(tolower(this->name[i]), hash);
1549         this->hash = end_name_hash(hash);
1550 
1551         return 0;
1552 }
1553 
1554 static int jfs_ci_compare(const struct dentry *dentry,
1555                 unsigned int len, const char *str, const struct qstr *name)
1556 {
1557         int i, result = 1;
1558 
1559         if (len != name->len)
1560                 goto out;
1561         for (i=0; i < len; i++) {
1562                 if (tolower(str[i]) != tolower(name->name[i]))
1563                         goto out;
1564         }
1565         result = 0;
1566 out:
1567         return result;
1568 }
1569 
1570 static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1571 {
1572         /*
1573          * This is not negative dentry. Always valid.
1574          *
1575          * Note, rename() to existing directory entry will have ->d_inode,
1576          * and will use existing name which isn't specified name by user.
1577          *
1578          * We may be able to drop this positive dentry here. But dropping
1579          * positive dentry isn't good idea. So it's unsupported like
1580          * rename("filename", "FILENAME") for now.
1581          */
1582         if (d_really_is_positive(dentry))
1583                 return 1;
1584 
1585         /*
1586          * This may be nfsd (or something), anyway, we can't see the
1587          * intent of this. So, since this can be for creation, drop it.
1588          */
1589         if (!flags)
1590                 return 0;
1591 
1592         /*
1593          * Drop the negative dentry, in order to make sure to use the
1594          * case sensitive name which is specified by user if this is
1595          * for creation.
1596          */
1597         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1598                 return 0;
1599         return 1;
1600 }
1601 
1602 const struct dentry_operations jfs_ci_dentry_operations =
1603 {
1604         .d_hash = jfs_ci_hash,
1605         .d_compare = jfs_ci_compare,
1606         .d_revalidate = jfs_ci_revalidate,
1607 };
/* [<][>][^][v][top][bottom][index][help] */
root/fs/jfs/namei.c

DEFINITIONS
