linux/fs/jfs/namei.c
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   1/*
   2 *   Copyright (C) International Business Machines Corp., 2000-2004
   3 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
   4 *
   5 *   This program is free software;  you can redistribute it and/or modify
   6 *   it under the terms of the GNU General Public License as published by
   7 *   the Free Software Foundation; either version 2 of the License, or
   8 *   (at your option) any later version.
   9 *
  10 *   This program is distributed in the hope that it will be useful,
  11 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13 *   the GNU General Public License for more details.
  14 *
  15 *   You should have received a copy of the GNU General Public License
  16 *   along with this program;  if not, write to the Free Software
  17 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 */
  19
  20#include <linux/fs.h>
  21#include <linux/namei.h>
  22#include <linux/ctype.h>
  23#include <linux/quotaops.h>
  24#include <linux/exportfs.h>
  25#include "jfs_incore.h"
  26#include "jfs_superblock.h"
  27#include "jfs_inode.h"
  28#include "jfs_dinode.h"
  29#include "jfs_dmap.h"
  30#include "jfs_unicode.h"
  31#include "jfs_metapage.h"
  32#include "jfs_xattr.h"
  33#include "jfs_acl.h"
  34#include "jfs_debug.h"
  35
  36/*
  37 * forward references
  38 */
  39const struct dentry_operations jfs_ci_dentry_operations;
  40
  41static s64 commitZeroLink(tid_t, struct inode *);
  42
  43/*
  44 * NAME:        free_ea_wmap(inode)
  45 *
  46 * FUNCTION:    free uncommitted extended attributes from working map
  47 *
  48 */
  49static inline void free_ea_wmap(struct inode *inode)
  50{
  51        dxd_t *ea = &JFS_IP(inode)->ea;
  52
  53        if (ea->flag & DXD_EXTENT) {
  54                /* free EA pages from cache */
  55                invalidate_dxd_metapages(inode, *ea);
  56                dbFree(inode, addressDXD(ea), lengthDXD(ea));
  57        }
  58        ea->flag = 0;
  59}
  60
  61/*
  62 * NAME:        jfs_create(dip, dentry, mode)
  63 *
  64 * FUNCTION:    create a regular file in the parent directory <dip>
  65 *              with name = <from dentry> and mode = <mode>
  66 *
  67 * PARAMETER:   dip     - parent directory vnode
  68 *              dentry  - dentry of new file
  69 *              mode    - create mode (rwxrwxrwx).
  70 *              nd- nd struct
  71 *
  72 * RETURN:      Errors from subroutines
  73 *
  74 */
  75static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode,
  76                bool excl)
  77{
  78        int rc = 0;
  79        tid_t tid;              /* transaction id */
  80        struct inode *ip = NULL;        /* child directory inode */
  81        ino_t ino;
  82        struct component_name dname;    /* child directory name */
  83        struct btstack btstack;
  84        struct inode *iplist[2];
  85        struct tblock *tblk;
  86
  87        jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
  88
  89        dquot_initialize(dip);
  90
  91        /*
  92         * search parent directory for entry/freespace
  93         * (dtSearch() returns parent directory page pinned)
  94         */
  95        if ((rc = get_UCSname(&dname, dentry)))
  96                goto out1;
  97
  98        /*
  99         * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
 100         * block there while holding dtree page, so we allocate the inode &
 101         * begin the transaction before we search the directory.
 102         */
 103        ip = ialloc(dip, mode);
 104        if (IS_ERR(ip)) {
 105                rc = PTR_ERR(ip);
 106                goto out2;
 107        }
 108
 109        tid = txBegin(dip->i_sb, 0);
 110
 111        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 112        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 113
 114        rc = jfs_init_acl(tid, ip, dip);
 115        if (rc)
 116                goto out3;
 117
 118        rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
 119        if (rc) {
 120                txAbort(tid, 0);
 121                goto out3;
 122        }
 123
 124        if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
 125                jfs_err("jfs_create: dtSearch returned %d", rc);
 126                txAbort(tid, 0);
 127                goto out3;
 128        }
 129
 130        tblk = tid_to_tblock(tid);
 131        tblk->xflag |= COMMIT_CREATE;
 132        tblk->ino = ip->i_ino;
 133        tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
 134
 135        iplist[0] = dip;
 136        iplist[1] = ip;
 137
 138        /*
 139         * initialize the child XAD tree root in-line in inode
 140         */
 141        xtInitRoot(tid, ip);
 142
 143        /*
 144         * create entry in parent directory for child directory
 145         * (dtInsert() releases parent directory page)
 146         */
 147        ino = ip->i_ino;
 148        if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
 149                if (rc == -EIO) {
 150                        jfs_err("jfs_create: dtInsert returned -EIO");
 151                        txAbort(tid, 1);        /* Marks Filesystem dirty */
 152                } else
 153                        txAbort(tid, 0);        /* Filesystem full */
 154                goto out3;
 155        }
 156
 157        ip->i_op = &jfs_file_inode_operations;
 158        ip->i_fop = &jfs_file_operations;
 159        ip->i_mapping->a_ops = &jfs_aops;
 160
 161        mark_inode_dirty(ip);
 162
 163        dip->i_ctime = dip->i_mtime = CURRENT_TIME;
 164
 165        mark_inode_dirty(dip);
 166
 167        rc = txCommit(tid, 2, &iplist[0], 0);
 168
 169      out3:
 170        txEnd(tid);
 171        mutex_unlock(&JFS_IP(ip)->commit_mutex);
 172        mutex_unlock(&JFS_IP(dip)->commit_mutex);
 173        if (rc) {
 174                free_ea_wmap(ip);
 175                clear_nlink(ip);
 176                unlock_new_inode(ip);
 177                iput(ip);
 178        } else {
 179                unlock_new_inode(ip);
 180                d_instantiate(dentry, ip);
 181        }
 182
 183      out2:
 184        free_UCSname(&dname);
 185
 186      out1:
 187
 188        jfs_info("jfs_create: rc:%d", rc);
 189        return rc;
 190}
 191
 192
 193/*
 194 * NAME:        jfs_mkdir(dip, dentry, mode)
 195 *
 196 * FUNCTION:    create a child directory in the parent directory <dip>
 197 *              with name = <from dentry> and mode = <mode>
 198 *
 199 * PARAMETER:   dip     - parent directory vnode
 200 *              dentry  - dentry of child directory
 201 *              mode    - create mode (rwxrwxrwx).
 202 *
 203 * RETURN:      Errors from subroutines
 204 *
 205 * note:
 206 * EACCESS: user needs search+write permission on the parent directory
 207 */
 208static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
 209{
 210        int rc = 0;
 211        tid_t tid;              /* transaction id */
 212        struct inode *ip = NULL;        /* child directory inode */
 213        ino_t ino;
 214        struct component_name dname;    /* child directory name */
 215        struct btstack btstack;
 216        struct inode *iplist[2];
 217        struct tblock *tblk;
 218
 219        jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
 220
 221        dquot_initialize(dip);
 222
 223        /*
 224         * search parent directory for entry/freespace
 225         * (dtSearch() returns parent directory page pinned)
 226         */
 227        if ((rc = get_UCSname(&dname, dentry)))
 228                goto out1;
 229
 230        /*
 231         * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
 232         * block there while holding dtree page, so we allocate the inode &
 233         * begin the transaction before we search the directory.
 234         */
 235        ip = ialloc(dip, S_IFDIR | mode);
 236        if (IS_ERR(ip)) {
 237                rc = PTR_ERR(ip);
 238                goto out2;
 239        }
 240
 241        tid = txBegin(dip->i_sb, 0);
 242
 243        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 244        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 245
 246        rc = jfs_init_acl(tid, ip, dip);
 247        if (rc)
 248                goto out3;
 249
 250        rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
 251        if (rc) {
 252                txAbort(tid, 0);
 253                goto out3;
 254        }
 255
 256        if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
 257                jfs_err("jfs_mkdir: dtSearch returned %d", rc);
 258                txAbort(tid, 0);
 259                goto out3;
 260        }
 261
 262        tblk = tid_to_tblock(tid);
 263        tblk->xflag |= COMMIT_CREATE;
 264        tblk->ino = ip->i_ino;
 265        tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
 266
 267        iplist[0] = dip;
 268        iplist[1] = ip;
 269
 270        /*
 271         * initialize the child directory in-line in inode
 272         */
 273        dtInitRoot(tid, ip, dip->i_ino);
 274
 275        /*
 276         * create entry in parent directory for child directory
 277         * (dtInsert() releases parent directory page)
 278         */
 279        ino = ip->i_ino;
 280        if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
 281                if (rc == -EIO) {
 282                        jfs_err("jfs_mkdir: dtInsert returned -EIO");
 283                        txAbort(tid, 1);        /* Marks Filesystem dirty */
 284                } else
 285                        txAbort(tid, 0);        /* Filesystem full */
 286                goto out3;
 287        }
 288
 289        set_nlink(ip, 2);       /* for '.' */
 290        ip->i_op = &jfs_dir_inode_operations;
 291        ip->i_fop = &jfs_dir_operations;
 292
 293        mark_inode_dirty(ip);
 294
 295        /* update parent directory inode */
 296        inc_nlink(dip);         /* for '..' from child directory */
 297        dip->i_ctime = dip->i_mtime = CURRENT_TIME;
 298        mark_inode_dirty(dip);
 299
 300        rc = txCommit(tid, 2, &iplist[0], 0);
 301
 302      out3:
 303        txEnd(tid);
 304        mutex_unlock(&JFS_IP(ip)->commit_mutex);
 305        mutex_unlock(&JFS_IP(dip)->commit_mutex);
 306        if (rc) {
 307                free_ea_wmap(ip);
 308                clear_nlink(ip);
 309                unlock_new_inode(ip);
 310                iput(ip);
 311        } else {
 312                unlock_new_inode(ip);
 313                d_instantiate(dentry, ip);
 314        }
 315
 316      out2:
 317        free_UCSname(&dname);
 318
 319
 320      out1:
 321
 322        jfs_info("jfs_mkdir: rc:%d", rc);
 323        return rc;
 324}
 325
 326/*
 327 * NAME:        jfs_rmdir(dip, dentry)
 328 *
 329 * FUNCTION:    remove a link to child directory
 330 *
 331 * PARAMETER:   dip     - parent inode
 332 *              dentry  - child directory dentry
 333 *
 334 * RETURN:      -EINVAL - if name is . or ..
 335 *              -EINVAL - if . or .. exist but are invalid.
 336 *              errors from subroutines
 337 *
 338 * note:
 339 * if other threads have the directory open when the last link
 340 * is removed, the "." and ".." entries, if present, are removed before
 341 * rmdir() returns and no new entries may be created in the directory,
 342 * but the directory is not removed until the last reference to
 343 * the directory is released (cf.unlink() of regular file).
 344 */
 345static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
 346{
 347        int rc;
 348        tid_t tid;              /* transaction id */
 349        struct inode *ip = dentry->d_inode;
 350        ino_t ino;
 351        struct component_name dname;
 352        struct inode *iplist[2];
 353        struct tblock *tblk;
 354
 355        jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
 356
 357        /* Init inode for quota operations. */
 358        dquot_initialize(dip);
 359        dquot_initialize(ip);
 360
 361        /* directory must be empty to be removed */
 362        if (!dtEmpty(ip)) {
 363                rc = -ENOTEMPTY;
 364                goto out;
 365        }
 366
 367        if ((rc = get_UCSname(&dname, dentry))) {
 368                goto out;
 369        }
 370
 371        tid = txBegin(dip->i_sb, 0);
 372
 373        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 374        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 375
 376        iplist[0] = dip;
 377        iplist[1] = ip;
 378
 379        tblk = tid_to_tblock(tid);
 380        tblk->xflag |= COMMIT_DELETE;
 381        tblk->u.ip = ip;
 382
 383        /*
 384         * delete the entry of target directory from parent directory
 385         */
 386        ino = ip->i_ino;
 387        if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
 388                jfs_err("jfs_rmdir: dtDelete returned %d", rc);
 389                if (rc == -EIO)
 390                        txAbort(tid, 1);
 391                txEnd(tid);
 392                mutex_unlock(&JFS_IP(ip)->commit_mutex);
 393                mutex_unlock(&JFS_IP(dip)->commit_mutex);
 394
 395                goto out2;
 396        }
 397
 398        /* update parent directory's link count corresponding
 399         * to ".." entry of the target directory deleted
 400         */
 401        dip->i_ctime = dip->i_mtime = CURRENT_TIME;
 402        inode_dec_link_count(dip);
 403
 404        /*
 405         * OS/2 could have created EA and/or ACL
 406         */
 407        /* free EA from both persistent and working map */
 408        if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
 409                /* free EA pages */
 410                txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
 411        }
 412        JFS_IP(ip)->ea.flag = 0;
 413
 414        /* free ACL from both persistent and working map */
 415        if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
 416                /* free ACL pages */
 417                txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
 418        }
 419        JFS_IP(ip)->acl.flag = 0;
 420
 421        /* mark the target directory as deleted */
 422        clear_nlink(ip);
 423        mark_inode_dirty(ip);
 424
 425        rc = txCommit(tid, 2, &iplist[0], 0);
 426
 427        txEnd(tid);
 428
 429        mutex_unlock(&JFS_IP(ip)->commit_mutex);
 430        mutex_unlock(&JFS_IP(dip)->commit_mutex);
 431
 432        /*
 433         * Truncating the directory index table is not guaranteed.  It
 434         * may need to be done iteratively
 435         */
 436        if (test_cflag(COMMIT_Stale, dip)) {
 437                if (dip->i_size > 1)
 438                        jfs_truncate_nolock(dip, 0);
 439
 440                clear_cflag(COMMIT_Stale, dip);
 441        }
 442
 443      out2:
 444        free_UCSname(&dname);
 445
 446      out:
 447        jfs_info("jfs_rmdir: rc:%d", rc);
 448        return rc;
 449}
 450
 451/*
 452 * NAME:        jfs_unlink(dip, dentry)
 453 *
 454 * FUNCTION:    remove a link to object <vp> named by <name>
 455 *              from parent directory <dvp>
 456 *
 457 * PARAMETER:   dip     - inode of parent directory
 458 *              dentry  - dentry of object to be removed
 459 *
 460 * RETURN:      errors from subroutines
 461 *
 462 * note:
 463 * temporary file: if one or more processes have the file open
 464 * when the last link is removed, the link will be removed before
 465 * unlink() returns, but the removal of the file contents will be
 466 * postponed until all references to the files are closed.
 467 *
 468 * JFS does NOT support unlink() on directories.
 469 *
 470 */
 471static int jfs_unlink(struct inode *dip, struct dentry *dentry)
 472{
 473        int rc;
 474        tid_t tid;              /* transaction id */
 475        struct inode *ip = dentry->d_inode;
 476        ino_t ino;
 477        struct component_name dname;    /* object name */
 478        struct inode *iplist[2];
 479        struct tblock *tblk;
 480        s64 new_size = 0;
 481        int commit_flag;
 482
 483        jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
 484
 485        /* Init inode for quota operations. */
 486        dquot_initialize(dip);
 487        dquot_initialize(ip);
 488
 489        if ((rc = get_UCSname(&dname, dentry)))
 490                goto out;
 491
 492        IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
 493
 494        tid = txBegin(dip->i_sb, 0);
 495
 496        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 497        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 498
 499        iplist[0] = dip;
 500        iplist[1] = ip;
 501
 502        /*
 503         * delete the entry of target file from parent directory
 504         */
 505        ino = ip->i_ino;
 506        if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
 507                jfs_err("jfs_unlink: dtDelete returned %d", rc);
 508                if (rc == -EIO)
 509                        txAbort(tid, 1);        /* Marks FS Dirty */
 510                txEnd(tid);
 511                mutex_unlock(&JFS_IP(ip)->commit_mutex);
 512                mutex_unlock(&JFS_IP(dip)->commit_mutex);
 513                IWRITE_UNLOCK(ip);
 514                goto out1;
 515        }
 516
 517        ASSERT(ip->i_nlink);
 518
 519        ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
 520        mark_inode_dirty(dip);
 521
 522        /* update target's inode */
 523        inode_dec_link_count(ip);
 524
 525        /*
 526         *      commit zero link count object
 527         */
 528        if (ip->i_nlink == 0) {
 529                assert(!test_cflag(COMMIT_Nolink, ip));
 530                /* free block resources */
 531                if ((new_size = commitZeroLink(tid, ip)) < 0) {
 532                        txAbort(tid, 1);        /* Marks FS Dirty */
 533                        txEnd(tid);
 534                        mutex_unlock(&JFS_IP(ip)->commit_mutex);
 535                        mutex_unlock(&JFS_IP(dip)->commit_mutex);
 536                        IWRITE_UNLOCK(ip);
 537                        rc = new_size;
 538                        goto out1;
 539                }
 540                tblk = tid_to_tblock(tid);
 541                tblk->xflag |= COMMIT_DELETE;
 542                tblk->u.ip = ip;
 543        }
 544
 545        /*
 546         * Incomplete truncate of file data can
 547         * result in timing problems unless we synchronously commit the
 548         * transaction.
 549         */
 550        if (new_size)
 551                commit_flag = COMMIT_SYNC;
 552        else
 553                commit_flag = 0;
 554
 555        /*
 556         * If xtTruncate was incomplete, commit synchronously to avoid
 557         * timing complications
 558         */
 559        rc = txCommit(tid, 2, &iplist[0], commit_flag);
 560
 561        txEnd(tid);
 562
 563        mutex_unlock(&JFS_IP(ip)->commit_mutex);
 564        mutex_unlock(&JFS_IP(dip)->commit_mutex);
 565
 566        while (new_size && (rc == 0)) {
 567                tid = txBegin(dip->i_sb, 0);
 568                mutex_lock(&JFS_IP(ip)->commit_mutex);
 569                new_size = xtTruncate_pmap(tid, ip, new_size);
 570                if (new_size < 0) {
 571                        txAbort(tid, 1);        /* Marks FS Dirty */
 572                        rc = new_size;
 573                } else
 574                        rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
 575                txEnd(tid);
 576                mutex_unlock(&JFS_IP(ip)->commit_mutex);
 577        }
 578
 579        if (ip->i_nlink == 0)
 580                set_cflag(COMMIT_Nolink, ip);
 581
 582        IWRITE_UNLOCK(ip);
 583
 584        /*
 585         * Truncating the directory index table is not guaranteed.  It
 586         * may need to be done iteratively
 587         */
 588        if (test_cflag(COMMIT_Stale, dip)) {
 589                if (dip->i_size > 1)
 590                        jfs_truncate_nolock(dip, 0);
 591
 592                clear_cflag(COMMIT_Stale, dip);
 593        }
 594
 595      out1:
 596        free_UCSname(&dname);
 597      out:
 598        jfs_info("jfs_unlink: rc:%d", rc);
 599        return rc;
 600}
 601
 602/*
 603 * NAME:        commitZeroLink()
 604 *
 605 * FUNCTION:    for non-directory, called by jfs_remove(),
 606 *              truncate a regular file, directory or symbolic
 607 *              link to zero length. return 0 if type is not
 608 *              one of these.
 609 *
 610 *              if the file is currently associated with a VM segment
 611 *              only permanent disk and inode map resources are freed,
 612 *              and neither the inode nor indirect blocks are modified
 613 *              so that the resources can be later freed in the work
 614 *              map by ctrunc1.
 615 *              if there is no VM segment on entry, the resources are
 616 *              freed in both work and permanent map.
 617 *              (? for temporary file - memory object is cached even
 618 *              after no reference:
 619 *              reference count > 0 -   )
 620 *
 621 * PARAMETERS:  cd      - pointer to commit data structure.
 622 *                        current inode is the one to truncate.
 623 *
 624 * RETURN:      Errors from subroutines
 625 */
 626static s64 commitZeroLink(tid_t tid, struct inode *ip)
 627{
 628        int filetype;
 629        struct tblock *tblk;
 630
 631        jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
 632
 633        filetype = ip->i_mode & S_IFMT;
 634        switch (filetype) {
 635        case S_IFREG:
 636                break;
 637        case S_IFLNK:
 638                /* fast symbolic link */
 639                if (ip->i_size < IDATASIZE) {
 640                        ip->i_size = 0;
 641                        return 0;
 642                }
 643                break;
 644        default:
 645                assert(filetype != S_IFDIR);
 646                return 0;
 647        }
 648
 649        set_cflag(COMMIT_Freewmap, ip);
 650
 651        /* mark transaction of block map update type */
 652        tblk = tid_to_tblock(tid);
 653        tblk->xflag |= COMMIT_PMAP;
 654
 655        /*
 656         * free EA
 657         */
 658        if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
 659                /* acquire maplock on EA to be freed from block map */
 660                txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
 661
 662        /*
 663         * free ACL
 664         */
 665        if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
 666                /* acquire maplock on EA to be freed from block map */
 667                txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
 668
 669        /*
 670         * free xtree/data (truncate to zero length):
 671         * free xtree/data pages from cache if COMMIT_PWMAP,
 672         * free xtree/data blocks from persistent block map, and
 673         * free xtree/data blocks from working block map if COMMIT_PWMAP;
 674         */
 675        if (ip->i_size)
 676                return xtTruncate_pmap(tid, ip, 0);
 677
 678        return 0;
 679}
 680
 681
 682/*
 683 * NAME:        jfs_free_zero_link()
 684 *
 685 * FUNCTION:    for non-directory, called by iClose(),
 686 *              free resources of a file from cache and WORKING map
 687 *              for a file previously committed with zero link count
 688 *              while associated with a pager object,
 689 *
 690 * PARAMETER:   ip      - pointer to inode of file.
 691 */
 692void jfs_free_zero_link(struct inode *ip)
 693{
 694        int type;
 695
 696        jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
 697
 698        /* return if not reg or symbolic link or if size is
 699         * already ok.
 700         */
 701        type = ip->i_mode & S_IFMT;
 702
 703        switch (type) {
 704        case S_IFREG:
 705                break;
 706        case S_IFLNK:
 707                /* if its contained in inode nothing to do */
 708                if (ip->i_size < IDATASIZE)
 709                        return;
 710                break;
 711        default:
 712                return;
 713        }
 714
 715        /*
 716         * free EA
 717         */
 718        if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
 719                s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
 720                int xlen = lengthDXD(&JFS_IP(ip)->ea);
 721                struct maplock maplock; /* maplock for COMMIT_WMAP */
 722                struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
 723
 724                /* free EA pages from cache */
 725                invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
 726
 727                /* free EA extent from working block map */
 728                maplock.index = 1;
 729                pxdlock = (struct pxd_lock *) & maplock;
 730                pxdlock->flag = mlckFREEPXD;
 731                PXDaddress(&pxdlock->pxd, xaddr);
 732                PXDlength(&pxdlock->pxd, xlen);
 733                txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
 734        }
 735
 736        /*
 737         * free ACL
 738         */
 739        if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
 740                s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
 741                int xlen = lengthDXD(&JFS_IP(ip)->acl);
 742                struct maplock maplock; /* maplock for COMMIT_WMAP */
 743                struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
 744
 745                invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
 746
 747                /* free ACL extent from working block map */
 748                maplock.index = 1;
 749                pxdlock = (struct pxd_lock *) & maplock;
 750                pxdlock->flag = mlckFREEPXD;
 751                PXDaddress(&pxdlock->pxd, xaddr);
 752                PXDlength(&pxdlock->pxd, xlen);
 753                txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
 754        }
 755
 756        /*
 757         * free xtree/data (truncate to zero length):
 758         * free xtree/data pages from cache, and
 759         * free xtree/data blocks from working block map;
 760         */
 761        if (ip->i_size)
 762                xtTruncate(0, ip, 0, COMMIT_WMAP);
 763}
 764
 765/*
 766 * NAME:        jfs_link(vp, dvp, name, crp)
 767 *
 768 * FUNCTION:    create a link to <vp> by the name = <name>
 769 *              in the parent directory <dvp>
 770 *
 771 * PARAMETER:   vp      - target object
 772 *              dvp     - parent directory of new link
 773 *              name    - name of new link to target object
 774 *              crp     - credential
 775 *
 776 * RETURN:      Errors from subroutines
 777 *
 778 * note:
 779 * JFS does NOT support link() on directories (to prevent circular
 780 * path in the directory hierarchy);
 781 * EPERM: the target object is a directory, and either the caller
 782 * does not have appropriate privileges or the implementation prohibits
 783 * using link() on directories [XPG4.2].
 784 *
 785 * JFS does NOT support links between file systems:
 786 * EXDEV: target object and new link are on different file systems and
 787 * implementation does not support links between file systems [XPG4.2].
 788 */
 789static int jfs_link(struct dentry *old_dentry,
 790             struct inode *dir, struct dentry *dentry)
 791{
 792        int rc;
 793        tid_t tid;
 794        struct inode *ip = old_dentry->d_inode;
 795        ino_t ino;
 796        struct component_name dname;
 797        struct btstack btstack;
 798        struct inode *iplist[2];
 799
 800        jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
 801                 dentry->d_name.name);
 802
 803        dquot_initialize(dir);
 804
 805        tid = txBegin(ip->i_sb, 0);
 806
 807        mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
 808        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 809
 810        /*
 811         * scan parent directory for entry/freespace
 812         */
 813        if ((rc = get_UCSname(&dname, dentry)))
 814                goto out;
 815
 816        if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
 817                goto free_dname;
 818
 819        /*
 820         * create entry for new link in parent directory
 821         */
 822        ino = ip->i_ino;
 823        if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
 824                goto free_dname;
 825
 826        /* update object inode */
 827        inc_nlink(ip);          /* for new link */
 828        ip->i_ctime = CURRENT_TIME;
 829        dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 830        mark_inode_dirty(dir);
 831        ihold(ip);
 832
 833        iplist[0] = ip;
 834        iplist[1] = dir;
 835        rc = txCommit(tid, 2, &iplist[0], 0);
 836
 837        if (rc) {
 838                drop_nlink(ip); /* never instantiated */
 839                iput(ip);
 840        } else
 841                d_instantiate(dentry, ip);
 842
 843      free_dname:
 844        free_UCSname(&dname);
 845
 846      out:
 847        txEnd(tid);
 848
 849        mutex_unlock(&JFS_IP(ip)->commit_mutex);
 850        mutex_unlock(&JFS_IP(dir)->commit_mutex);
 851
 852        jfs_info("jfs_link: rc:%d", rc);
 853        return rc;
 854}
 855
 856/*
 857 * NAME:        jfs_symlink(dip, dentry, name)
 858 *
 859 * FUNCTION:    creates a symbolic link to <symlink> by name <name>
 860 *                      in directory <dip>
 861 *
 862 * PARAMETER:   dip     - parent directory vnode
 863 *              dentry  - dentry of symbolic link
 864 *              name    - the path name of the existing object
 865 *                        that will be the source of the link
 866 *
 867 * RETURN:      errors from subroutines
 868 *
 869 * note:
 870 * ENAMETOOLONG: pathname resolution of a symbolic link produced
 871 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
 872*/
 873
 874static int jfs_symlink(struct inode *dip, struct dentry *dentry,
 875                const char *name)
 876{
 877        int rc;
 878        tid_t tid;
 879        ino_t ino = 0;
 880        struct component_name dname;
 881        int ssize;              /* source pathname size */
 882        struct btstack btstack;
 883        struct inode *ip = dentry->d_inode;
 884        unchar *i_fastsymlink;
 885        s64 xlen = 0;
 886        int bmask = 0, xsize;
 887        s64 xaddr;
 888        struct metapage *mp;
 889        struct super_block *sb;
 890        struct tblock *tblk;
 891
 892        struct inode *iplist[2];
 893
 894        jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
 895
 896        dquot_initialize(dip);
 897
 898        ssize = strlen(name) + 1;
 899
 900        /*
 901         * search parent directory for entry/freespace
 902         * (dtSearch() returns parent directory page pinned)
 903         */
 904
 905        if ((rc = get_UCSname(&dname, dentry)))
 906                goto out1;
 907
 908        /*
 909         * allocate on-disk/in-memory inode for symbolic link:
 910         * (iAlloc() returns new, locked inode)
 911         */
 912        ip = ialloc(dip, S_IFLNK | 0777);
 913        if (IS_ERR(ip)) {
 914                rc = PTR_ERR(ip);
 915                goto out2;
 916        }
 917
 918        tid = txBegin(dip->i_sb, 0);
 919
 920        mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
 921        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
 922
 923        rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
 924        if (rc)
 925                goto out3;
 926
 927        tblk = tid_to_tblock(tid);
 928        tblk->xflag |= COMMIT_CREATE;
 929        tblk->ino = ip->i_ino;
 930        tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
 931
 932        /* fix symlink access permission
 933         * (dir_create() ANDs in the u.u_cmask,
 934         * but symlinks really need to be 777 access)
 935         */
 936        ip->i_mode |= 0777;
 937
 938        /*
 939         * write symbolic link target path name
 940         */
 941        xtInitRoot(tid, ip);
 942
 943        /*
 944         * write source path name inline in on-disk inode (fast symbolic link)
 945         */
 946
 947        if (ssize <= IDATASIZE) {
 948                ip->i_op = &jfs_fast_symlink_inode_operations;
 949
 950                i_fastsymlink = JFS_IP(ip)->i_inline;
 951                memcpy(i_fastsymlink, name, ssize);
 952                ip->i_size = ssize - 1;
 953
 954                /*
 955                 * if symlink is > 128 bytes, we don't have the space to
 956                 * store inline extended attributes
 957                 */
 958                if (ssize > sizeof (JFS_IP(ip)->i_inline))
 959                        JFS_IP(ip)->mode2 &= ~INLINEEA;
 960
 961                jfs_info("jfs_symlink: fast symlink added  ssize:%d name:%s ",
 962                         ssize, name);
 963        }
 964        /*
 965         * write source path name in a single extent
 966         */
 967        else {
 968                jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
 969
 970                ip->i_op = &jfs_symlink_inode_operations;
 971                ip->i_mapping->a_ops = &jfs_aops;
 972
 973                /*
 974                 * even though the data of symlink object (source
 975                 * path name) is treated as non-journaled user data,
 976                 * it is read/written thru buffer cache for performance.
 977                 */
 978                sb = ip->i_sb;
 979                bmask = JFS_SBI(sb)->bsize - 1;
 980                xsize = (ssize + bmask) & ~bmask;
 981                xaddr = 0;
 982                xlen = xsize >> JFS_SBI(sb)->l2bsize;
 983                if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
 984                        txAbort(tid, 0);
 985                        goto out3;
 986                }
 987                ip->i_size = ssize - 1;
 988                while (ssize) {
 989                        /* This is kind of silly since PATH_MAX == 4K */
 990                        int copy_size = min(ssize, PSIZE);
 991
 992                        mp = get_metapage(ip, xaddr, PSIZE, 1);
 993
 994                        if (mp == NULL) {
 995                                xtTruncate(tid, ip, 0, COMMIT_PWMAP);
 996                                rc = -EIO;
 997                                txAbort(tid, 0);
 998                                goto out3;
 999                        }
1000                        memcpy(mp->data, name, copy_size);
1001                        flush_metapage(mp);
1002                        ssize -= copy_size;
1003                        name += copy_size;
1004                        xaddr += JFS_SBI(sb)->nbperpage;
1005                }
1006        }
1007
1008        /*
1009         * create entry for symbolic link in parent directory
1010         */
1011        rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1012        if (rc == 0) {
1013                ino = ip->i_ino;
1014                rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1015        }
1016        if (rc) {
1017                if (xlen)
1018                        xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1019                txAbort(tid, 0);
1020                /* discard new inode */
1021                goto out3;
1022        }
1023
1024        mark_inode_dirty(ip);
1025
1026        dip->i_ctime = dip->i_mtime = CURRENT_TIME;
1027        mark_inode_dirty(dip);
1028        /*
1029         * commit update of parent directory and link object
1030         */
1031
1032        iplist[0] = dip;
1033        iplist[1] = ip;
1034        rc = txCommit(tid, 2, &iplist[0], 0);
1035
1036      out3:
1037        txEnd(tid);
1038        mutex_unlock(&JFS_IP(ip)->commit_mutex);
1039        mutex_unlock(&JFS_IP(dip)->commit_mutex);
1040        if (rc) {
1041                free_ea_wmap(ip);
1042                clear_nlink(ip);
1043                unlock_new_inode(ip);
1044                iput(ip);
1045        } else {
1046                unlock_new_inode(ip);
1047                d_instantiate(dentry, ip);
1048        }
1049
1050      out2:
1051        free_UCSname(&dname);
1052
1053      out1:
1054        jfs_info("jfs_symlink: rc:%d", rc);
1055        return rc;
1056}
1057
1058
1059/*
1060 * NAME:        jfs_rename
1061 *
1062 * FUNCTION:    rename a file or directory
1063 */
1064static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1065               struct inode *new_dir, struct dentry *new_dentry)
1066{
1067        struct btstack btstack;
1068        ino_t ino;
1069        struct component_name new_dname;
1070        struct inode *new_ip;
1071        struct component_name old_dname;
1072        struct inode *old_ip;
1073        int rc;
1074        tid_t tid;
1075        struct tlock *tlck;
1076        struct dt_lock *dtlck;
1077        struct lv *lv;
1078        int ipcount;
1079        struct inode *iplist[4];
1080        struct tblock *tblk;
1081        s64 new_size = 0;
1082        int commit_flag;
1083
1084
1085        jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1086                 new_dentry->d_name.name);
1087
1088        dquot_initialize(old_dir);
1089        dquot_initialize(new_dir);
1090
1091        old_ip = old_dentry->d_inode;
1092        new_ip = new_dentry->d_inode;
1093
1094        if ((rc = get_UCSname(&old_dname, old_dentry)))
1095                goto out1;
1096
1097        if ((rc = get_UCSname(&new_dname, new_dentry)))
1098                goto out2;
1099
1100        /*
1101         * Make sure source inode number is what we think it is
1102         */
1103        rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1104        if (rc || (ino != old_ip->i_ino)) {
1105                rc = -ENOENT;
1106                goto out3;
1107        }
1108
1109        /*
1110         * Make sure dest inode number (if any) is what we think it is
1111         */
1112        rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1113        if (!rc) {
1114                if ((!new_ip) || (ino != new_ip->i_ino)) {
1115                        rc = -ESTALE;
1116                        goto out3;
1117                }
1118        } else if (rc != -ENOENT)
1119                goto out3;
1120        else if (new_ip) {
1121                /* no entry exists, but one was expected */
1122                rc = -ESTALE;
1123                goto out3;
1124        }
1125
1126        if (S_ISDIR(old_ip->i_mode)) {
1127                if (new_ip) {
1128                        if (!dtEmpty(new_ip)) {
1129                                rc = -ENOTEMPTY;
1130                                goto out3;
1131                        }
1132                }
1133        } else if (new_ip) {
1134                IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1135                /* Init inode for quota operations. */
1136                dquot_initialize(new_ip);
1137        }
1138
1139        /*
1140         * The real work starts here
1141         */
1142        tid = txBegin(new_dir->i_sb, 0);
1143
1144        /*
1145         * How do we know the locking is safe from deadlocks?
1146         * The vfs does the hard part for us.  Any time we are taking nested
1147         * commit_mutexes, the vfs already has i_mutex held on the parent.
1148         * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1149         */
1150        mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1151        mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1152        if (old_dir != new_dir)
1153                mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1154                                  COMMIT_MUTEX_SECOND_PARENT);
1155
1156        if (new_ip) {
1157                mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1158                                  COMMIT_MUTEX_VICTIM);
1159                /*
1160                 * Change existing directory entry to new inode number
1161                 */
1162                ino = new_ip->i_ino;
1163                rc = dtModify(tid, new_dir, &new_dname, &ino,
1164                              old_ip->i_ino, JFS_RENAME);
1165                if (rc)
1166                        goto out4;
1167                drop_nlink(new_ip);
1168                if (S_ISDIR(new_ip->i_mode)) {
1169                        drop_nlink(new_ip);
1170                        if (new_ip->i_nlink) {
1171                                mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1172                                if (old_dir != new_dir)
1173                                        mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1174                                mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1175                                mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1176                                if (!S_ISDIR(old_ip->i_mode) && new_ip)
1177                                        IWRITE_UNLOCK(new_ip);
1178                                jfs_error(new_ip->i_sb,
1179                                          "jfs_rename: new_ip->i_nlink != 0");
1180                                return -EIO;
1181                        }
1182                        tblk = tid_to_tblock(tid);
1183                        tblk->xflag |= COMMIT_DELETE;
1184                        tblk->u.ip = new_ip;
1185                } else if (new_ip->i_nlink == 0) {
1186                        assert(!test_cflag(COMMIT_Nolink, new_ip));
1187                        /* free block resources */
1188                        if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1189                                txAbort(tid, 1);        /* Marks FS Dirty */
1190                                rc = new_size;
1191                                goto out4;
1192                        }
1193                        tblk = tid_to_tblock(tid);
1194                        tblk->xflag |= COMMIT_DELETE;
1195                        tblk->u.ip = new_ip;
1196                } else {
1197                        new_ip->i_ctime = CURRENT_TIME;
1198                        mark_inode_dirty(new_ip);
1199                }
1200        } else {
1201                /*
1202                 * Add new directory entry
1203                 */
1204                rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1205                              JFS_CREATE);
1206                if (rc) {
1207                        jfs_err("jfs_rename didn't expect dtSearch to fail "
1208                                "w/rc = %d", rc);
1209                        goto out4;
1210                }
1211
1212                ino = old_ip->i_ino;
1213                rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1214                if (rc) {
1215                        if (rc == -EIO)
1216                                jfs_err("jfs_rename: dtInsert returned -EIO");
1217                        goto out4;
1218                }
1219                if (S_ISDIR(old_ip->i_mode))
1220                        inc_nlink(new_dir);
1221        }
1222        /*
1223         * Remove old directory entry
1224         */
1225
1226        ino = old_ip->i_ino;
1227        rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1228        if (rc) {
1229                jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1230                        rc);
1231                txAbort(tid, 1);        /* Marks Filesystem dirty */
1232                goto out4;
1233        }
1234        if (S_ISDIR(old_ip->i_mode)) {
1235                drop_nlink(old_dir);
1236                if (old_dir != new_dir) {
1237                        /*
1238                         * Change inode number of parent for moved directory
1239                         */
1240
1241                        JFS_IP(old_ip)->i_dtroot.header.idotdot =
1242                                cpu_to_le32(new_dir->i_ino);
1243
1244                        /* Linelock header of dtree */
1245                        tlck = txLock(tid, old_ip,
1246                                    (struct metapage *) &JFS_IP(old_ip)->bxflag,
1247                                      tlckDTREE | tlckBTROOT | tlckRELINK);
1248                        dtlck = (struct dt_lock *) & tlck->lock;
1249                        ASSERT(dtlck->index == 0);
1250                        lv = & dtlck->lv[0];
1251                        lv->offset = 0;
1252                        lv->length = 1;
1253                        dtlck->index++;
1254                }
1255        }
1256
1257        /*
1258         * Update ctime on changed/moved inodes & mark dirty
1259         */
1260        old_ip->i_ctime = CURRENT_TIME;
1261        mark_inode_dirty(old_ip);
1262
1263        new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1264        mark_inode_dirty(new_dir);
1265
1266        /* Build list of inodes modified by this transaction */
1267        ipcount = 0;
1268        iplist[ipcount++] = old_ip;
1269        if (new_ip)
1270                iplist[ipcount++] = new_ip;
1271        iplist[ipcount++] = old_dir;
1272
1273        if (old_dir != new_dir) {
1274                iplist[ipcount++] = new_dir;
1275                old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1276                mark_inode_dirty(old_dir);
1277        }
1278
1279        /*
1280         * Incomplete truncate of file data can
1281         * result in timing problems unless we synchronously commit the
1282         * transaction.
1283         */
1284        if (new_size)
1285                commit_flag = COMMIT_SYNC;
1286        else
1287                commit_flag = 0;
1288
1289        rc = txCommit(tid, ipcount, iplist, commit_flag);
1290
1291      out4:
1292        txEnd(tid);
1293        if (new_ip)
1294                mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1295        if (old_dir != new_dir)
1296                mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1297        mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1298        mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1299
1300        while (new_size && (rc == 0)) {
1301                tid = txBegin(new_ip->i_sb, 0);
1302                mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1303                new_size = xtTruncate_pmap(tid, new_ip, new_size);
1304                if (new_size < 0) {
1305                        txAbort(tid, 1);
1306                        rc = new_size;
1307                } else
1308                        rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1309                txEnd(tid);
1310                mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1311        }
1312        if (new_ip && (new_ip->i_nlink == 0))
1313                set_cflag(COMMIT_Nolink, new_ip);
1314      out3:
1315        free_UCSname(&new_dname);
1316      out2:
1317        free_UCSname(&old_dname);
1318      out1:
1319        if (new_ip && !S_ISDIR(new_ip->i_mode))
1320                IWRITE_UNLOCK(new_ip);
1321        /*
1322         * Truncating the directory index table is not guaranteed.  It
1323         * may need to be done iteratively
1324         */
1325        if (test_cflag(COMMIT_Stale, old_dir)) {
1326                if (old_dir->i_size > 1)
1327                        jfs_truncate_nolock(old_dir, 0);
1328
1329                clear_cflag(COMMIT_Stale, old_dir);
1330        }
1331
1332        jfs_info("jfs_rename: returning %d", rc);
1333        return rc;
1334}
1335
1336
1337/*
1338 * NAME:        jfs_mknod
1339 *
1340 * FUNCTION:    Create a special file (device)
1341 */
1342static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1343                umode_t mode, dev_t rdev)
1344{
1345        struct jfs_inode_info *jfs_ip;
1346        struct btstack btstack;
1347        struct component_name dname;
1348        ino_t ino;
1349        struct inode *ip;
1350        struct inode *iplist[2];
1351        int rc;
1352        tid_t tid;
1353        struct tblock *tblk;
1354
1355        if (!new_valid_dev(rdev))
1356                return -EINVAL;
1357
1358        jfs_info("jfs_mknod: %s", dentry->d_name.name);
1359
1360        dquot_initialize(dir);
1361
1362        if ((rc = get_UCSname(&dname, dentry)))
1363                goto out;
1364
1365        ip = ialloc(dir, mode);
1366        if (IS_ERR(ip)) {
1367                rc = PTR_ERR(ip);
1368                goto out1;
1369        }
1370        jfs_ip = JFS_IP(ip);
1371
1372        tid = txBegin(dir->i_sb, 0);
1373
1374        mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1375        mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1376
1377        rc = jfs_init_acl(tid, ip, dir);
1378        if (rc)
1379                goto out3;
1380
1381        rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1382        if (rc) {
1383                txAbort(tid, 0);
1384                goto out3;
1385        }
1386
1387        if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1388                txAbort(tid, 0);
1389                goto out3;
1390        }
1391
1392        tblk = tid_to_tblock(tid);
1393        tblk->xflag |= COMMIT_CREATE;
1394        tblk->ino = ip->i_ino;
1395        tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1396
1397        ino = ip->i_ino;
1398        if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1399                txAbort(tid, 0);
1400                goto out3;
1401        }
1402
1403        ip->i_op = &jfs_file_inode_operations;
1404        jfs_ip->dev = new_encode_dev(rdev);
1405        init_special_inode(ip, ip->i_mode, rdev);
1406
1407        mark_inode_dirty(ip);
1408
1409        dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1410
1411        mark_inode_dirty(dir);
1412
1413        iplist[0] = dir;
1414        iplist[1] = ip;
1415        rc = txCommit(tid, 2, iplist, 0);
1416
1417      out3:
1418        txEnd(tid);
1419        mutex_unlock(&JFS_IP(ip)->commit_mutex);
1420        mutex_unlock(&JFS_IP(dir)->commit_mutex);
1421        if (rc) {
1422                free_ea_wmap(ip);
1423                clear_nlink(ip);
1424                unlock_new_inode(ip);
1425                iput(ip);
1426        } else {
1427                unlock_new_inode(ip);
1428                d_instantiate(dentry, ip);
1429        }
1430
1431      out1:
1432        free_UCSname(&dname);
1433
1434      out:
1435        jfs_info("jfs_mknod: returning %d", rc);
1436        return rc;
1437}
1438
1439static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1440{
1441        struct btstack btstack;
1442        ino_t inum;
1443        struct inode *ip;
1444        struct component_name key;
1445        int rc;
1446
1447        jfs_info("jfs_lookup: name = %s", dentry->d_name.name);
1448
1449        if ((rc = get_UCSname(&key, dentry)))
1450                return ERR_PTR(rc);
1451        rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1452        free_UCSname(&key);
1453        if (rc == -ENOENT) {
1454                ip = NULL;
1455        } else if (rc) {
1456                jfs_err("jfs_lookup: dtSearch returned %d", rc);
1457                ip = ERR_PTR(rc);
1458        } else {
1459                ip = jfs_iget(dip->i_sb, inum);
1460                if (IS_ERR(ip))
1461                        jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1462        }
1463
1464        return d_splice_alias(ip, dentry);
1465}
1466
1467static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1468                u64 ino, u32 generation)
1469{
1470        struct inode *inode;
1471
1472        if (ino == 0)
1473                return ERR_PTR(-ESTALE);
1474        inode = jfs_iget(sb, ino);
1475        if (IS_ERR(inode))
1476                return ERR_CAST(inode);
1477
1478        if (generation && inode->i_generation != generation) {
1479                iput(inode);
1480                return ERR_PTR(-ESTALE);
1481        }
1482
1483        return inode;
1484}
1485
1486struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1487                int fh_len, int fh_type)
1488{
1489        return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1490                                    jfs_nfs_get_inode);
1491}
1492
1493struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1494                int fh_len, int fh_type)
1495{
1496        return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1497                                    jfs_nfs_get_inode);
1498}
1499
1500struct dentry *jfs_get_parent(struct dentry *dentry)
1501{
1502        unsigned long parent_ino;
1503
1504        parent_ino =
1505                le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1506
1507        return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino));
1508}
1509
1510const struct inode_operations jfs_dir_inode_operations = {
1511        .create         = jfs_create,
1512        .lookup         = jfs_lookup,
1513        .link           = jfs_link,
1514        .unlink         = jfs_unlink,
1515        .symlink        = jfs_symlink,
1516        .mkdir          = jfs_mkdir,
1517        .rmdir          = jfs_rmdir,
1518        .mknod          = jfs_mknod,
1519        .rename         = jfs_rename,
1520        .setxattr       = jfs_setxattr,
1521        .getxattr       = jfs_getxattr,
1522        .listxattr      = jfs_listxattr,
1523        .removexattr    = jfs_removexattr,
1524        .setattr        = jfs_setattr,
1525#ifdef CONFIG_JFS_POSIX_ACL
1526        .get_acl        = jfs_get_acl,
1527#endif
1528};
1529
1530const struct file_operations jfs_dir_operations = {
1531        .read           = generic_read_dir,
1532        .readdir        = 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
1541static int jfs_ci_hash(const struct dentry *dir, const struct inode *inode,
1542                struct qstr *this)
1543{
1544        unsigned long hash;
1545        int i;
1546
1547        hash = init_name_hash();
1548        for (i=0; i < this->len; i++)
1549                hash = partial_name_hash(tolower(this->name[i]), hash);
1550        this->hash = end_name_hash(hash);
1551
1552        return 0;
1553}
1554
1555static int jfs_ci_compare(const struct dentry *parent,
1556                const struct inode *pinode,
1557                const struct dentry *dentry, const struct inode *inode,
1558                unsigned int len, const char *str, const struct qstr *name)
1559{
1560        int i, result = 1;
1561
1562        if (len != name->len)
1563                goto out;
1564        for (i=0; i < len; i++) {
1565                if (tolower(str[i]) != tolower(name->name[i]))
1566                        goto out;
1567        }
1568        result = 0;
1569out:
1570        return result;
1571}
1572
1573static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1574{
1575        /*
1576         * This is not negative dentry. Always valid.
1577         *
1578         * Note, rename() to existing directory entry will have ->d_inode,
1579         * and will use existing name which isn't specified name by user.
1580         *
1581         * We may be able to drop this positive dentry here. But dropping
1582         * positive dentry isn't good idea. So it's unsupported like
1583         * rename("filename", "FILENAME") for now.
1584         */
1585        if (dentry->d_inode)
1586                return 1;
1587
1588        /*
1589         * This may be nfsd (or something), anyway, we can't see the
1590         * intent of this. So, since this can be for creation, drop it.
1591         */
1592        if (!flags)
1593                return 0;
1594
1595        /*
1596         * Drop the negative dentry, in order to make sure to use the
1597         * case sensitive name which is specified by user if this is
1598         * for creation.
1599         */
1600        if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1601                return 0;
1602        return 1;
1603}
1604
1605const struct dentry_operations jfs_ci_dentry_operations =
1606{
1607        .d_hash = jfs_ci_hash,
1608        .d_compare = jfs_ci_compare,
1609        .d_revalidate = jfs_ci_revalidate,
1610};
1611
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