The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/fs/jfs/namei.c

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    1 /*
    2  *   Copyright (c) International Business Machines Corp., 2000-2002
    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 "jfs_incore.h"
   22 #include "jfs_inode.h"
   23 #include "jfs_dinode.h"
   24 #include "jfs_dmap.h"
   25 #include "jfs_unicode.h"
   26 #include "jfs_metapage.h"
   27 #include "jfs_xattr.h"
   28 #include "jfs_debug.h"
   29 
   30 extern struct inode_operations jfs_file_inode_operations;
   31 extern struct inode_operations jfs_symlink_inode_operations;
   32 extern struct file_operations jfs_file_operations;
   33 extern struct address_space_operations jfs_aops;
   34 
   35 extern int jfs_fsync(struct file *, struct dentry *, int);
   36 extern void jfs_truncate_nolock(struct inode *, loff_t);
   37 
   38 /*
   39  * forward references
   40  */
   41 struct inode_operations jfs_dir_inode_operations;
   42 struct file_operations jfs_dir_operations;
   43 
   44 s64 commitZeroLink(tid_t, struct inode *);
   45 
   46 /*
   47  * NAME:        jfs_create(dip, dentry, mode)
   48  *
   49  * FUNCTION:    create a regular file in the parent directory <dip>
   50  *              with name = <from dentry> and mode = <mode>
   51  *
   52  * PARAMETER:   dip     - parent directory vnode
   53  *              dentry  - dentry of new file
   54  *              mode    - create mode (rwxrwxrwx).
   55  *
   56  * RETURN:      Errors from subroutines
   57  *
   58  */
   59 int jfs_create(struct inode *dip, struct dentry *dentry, int mode)
   60 {
   61         int rc = 0;
   62         tid_t tid;              /* transaction id */
   63         struct inode *ip = NULL;        /* child directory inode */
   64         ino_t ino;
   65         struct component_name dname;    /* child directory name */
   66         struct btstack btstack;
   67         struct inode *iplist[2];
   68         struct tblock *tblk;
   69 
   70         jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
   71 
   72         /*
   73          * search parent directory for entry/freespace
   74          * (dtSearch() returns parent directory page pinned)
   75          */
   76         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dip->i_sb)->nls_tab)))
   77                 goto out1;
   78 
   79         /*
   80          * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
   81          * block there while holding dtree page, so we allocate the inode &
   82          * begin the transaction before we search the directory.
   83          */
   84         ip = ialloc(dip, mode);
   85         if (ip == NULL) {
   86                 rc = ENOSPC;
   87                 goto out2;
   88         }
   89 
   90         tid = txBegin(dip->i_sb, 0);
   91 
   92         down(&JFS_IP(dip)->commit_sem);
   93         down(&JFS_IP(ip)->commit_sem);
   94 
   95         if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
   96                 jfs_err("jfs_create: dtSearch returned %d", rc);
   97                 goto out3;
   98         }
   99 
  100         tblk = tid_to_tblock(tid);
  101         tblk->xflag |= COMMIT_CREATE;
  102         tblk->ip = ip;
  103 
  104         iplist[0] = dip;
  105         iplist[1] = ip;
  106 
  107         /*
  108          * initialize the child XAD tree root in-line in inode
  109          */
  110         xtInitRoot(tid, ip);
  111 
  112         /*
  113          * create entry in parent directory for child directory
  114          * (dtInsert() releases parent directory page)
  115          */
  116         ino = ip->i_ino;
  117         if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
  118                 jfs_err("jfs_create: dtInsert returned %d", rc);
  119                 if (rc == EIO)
  120                         txAbort(tid, 1);        /* Marks Filesystem dirty */
  121                 else
  122                         txAbort(tid, 0);        /* Filesystem full */
  123                 goto out3;
  124         }
  125 
  126         ip->i_op = &jfs_file_inode_operations;
  127         ip->i_fop = &jfs_file_operations;
  128         ip->i_mapping->a_ops = &jfs_aops;
  129 
  130         insert_inode_hash(ip);
  131         mark_inode_dirty(ip);
  132         d_instantiate(dentry, ip);
  133 
  134         dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  135 
  136         mark_inode_dirty(dip);
  137 
  138         rc = txCommit(tid, 2, &iplist[0], 0);
  139 
  140       out3:
  141         txEnd(tid);
  142         up(&JFS_IP(dip)->commit_sem);
  143         up(&JFS_IP(ip)->commit_sem);
  144         if (rc) {
  145                 ip->i_nlink = 0;
  146                 iput(ip);
  147         }
  148 
  149       out2:
  150         free_UCSname(&dname);
  151 
  152       out1:
  153 
  154         jfs_info("jfs_create: rc:%d", -rc);
  155         return -rc;
  156 }
  157 
  158 
  159 /*
  160  * NAME:        jfs_mkdir(dip, dentry, mode)
  161  *
  162  * FUNCTION:    create a child directory in the parent directory <dip>
  163  *              with name = <from dentry> and mode = <mode>
  164  *
  165  * PARAMETER:   dip     - parent directory vnode
  166  *              dentry  - dentry of child directory
  167  *              mode    - create mode (rwxrwxrwx).
  168  *
  169  * RETURN:      Errors from subroutines
  170  *
  171  * note:
  172  * EACCESS: user needs search+write permission on the parent directory
  173  */
  174 int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
  175 {
  176         int rc = 0;
  177         tid_t tid;              /* transaction id */
  178         struct inode *ip = NULL;        /* child directory inode */
  179         ino_t ino;
  180         struct component_name dname;    /* child directory name */
  181         struct btstack btstack;
  182         struct inode *iplist[2];
  183         struct tblock *tblk;
  184 
  185         jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
  186 
  187         /* link count overflow on parent directory ? */
  188         if (dip->i_nlink == JFS_LINK_MAX) {
  189                 rc = EMLINK;
  190                 goto out1;
  191         }
  192 
  193         /*
  194          * search parent directory for entry/freespace
  195          * (dtSearch() returns parent directory page pinned)
  196          */
  197         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dip->i_sb)->nls_tab)))
  198                 goto out1;
  199 
  200         /*
  201          * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
  202          * block there while holding dtree page, so we allocate the inode &
  203          * begin the transaction before we search the directory.
  204          */
  205         ip = ialloc(dip, S_IFDIR | mode);
  206         if (ip == NULL) {
  207                 rc = ENOSPC;
  208                 goto out2;
  209         }
  210 
  211         tid = txBegin(dip->i_sb, 0);
  212 
  213         down(&JFS_IP(dip)->commit_sem);
  214         down(&JFS_IP(ip)->commit_sem);
  215 
  216         if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
  217                 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
  218                 goto out3;
  219         }
  220 
  221         tblk = tid_to_tblock(tid);
  222         tblk->xflag |= COMMIT_CREATE;
  223         tblk->ip = ip;
  224 
  225         iplist[0] = dip;
  226         iplist[1] = ip;
  227 
  228         /*
  229          * initialize the child directory in-line in inode
  230          */
  231         dtInitRoot(tid, ip, dip->i_ino);
  232 
  233         /*
  234          * create entry in parent directory for child directory
  235          * (dtInsert() releases parent directory page)
  236          */
  237         ino = ip->i_ino;
  238         if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
  239                 jfs_err("jfs_mkdir: dtInsert returned %d", rc);
  240 
  241                 if (rc == EIO)
  242                         txAbort(tid, 1);        /* Marks Filesystem dirty */
  243                 else
  244                         txAbort(tid, 0);        /* Filesystem full */
  245                 goto out3;
  246         }
  247 
  248         ip->i_nlink = 2;        /* for '.' */
  249         ip->i_op = &jfs_dir_inode_operations;
  250         ip->i_fop = &jfs_dir_operations;
  251         ip->i_mapping->a_ops = &jfs_aops;
  252         ip->i_mapping->gfp_mask = GFP_NOFS;
  253 
  254         insert_inode_hash(ip);
  255         mark_inode_dirty(ip);
  256         d_instantiate(dentry, ip);
  257 
  258         /* update parent directory inode */
  259         dip->i_nlink++;         /* for '..' from child directory */
  260         dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  261         mark_inode_dirty(dip);
  262 
  263         rc = txCommit(tid, 2, &iplist[0], 0);
  264 
  265       out3:
  266         txEnd(tid);
  267         up(&JFS_IP(dip)->commit_sem);
  268         up(&JFS_IP(ip)->commit_sem);
  269         if (rc) {
  270                 ip->i_nlink = 0;
  271                 iput(ip);
  272         }
  273 
  274       out2:
  275         free_UCSname(&dname);
  276 
  277       out1:
  278 
  279         jfs_info("jfs_mkdir: rc:%d", -rc);
  280         return -rc;
  281 }
  282 
  283 /*
  284  * NAME:        jfs_rmdir(dip, dentry)
  285  *
  286  * FUNCTION:    remove a link to child directory
  287  *
  288  * PARAMETER:   dip     - parent inode
  289  *              dentry  - child directory dentry
  290  *
  291  * RETURN:      EINVAL  - if name is . or ..
  292  *              EINVAL  - if . or .. exist but are invalid.
  293  *              errors from subroutines
  294  *
  295  * note:
  296  * if other threads have the directory open when the last link 
  297  * is removed, the "." and ".." entries, if present, are removed before 
  298  * rmdir() returns and no new entries may be created in the directory, 
  299  * but the directory is not removed until the last reference to 
  300  * the directory is released (cf.unlink() of regular file).
  301  */
  302 int jfs_rmdir(struct inode *dip, struct dentry *dentry)
  303 {
  304         int rc;
  305         tid_t tid;              /* transaction id */
  306         struct inode *ip = dentry->d_inode;
  307         ino_t ino;
  308         struct component_name dname;
  309         struct inode *iplist[2];
  310         struct tblock *tblk;
  311 
  312         jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
  313 
  314         /* directory must be empty to be removed */
  315         if (!dtEmpty(ip)) {
  316                 rc = ENOTEMPTY;
  317                 goto out;
  318         }
  319 
  320         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dip->i_sb)->nls_tab))) {
  321                 goto out;
  322         }
  323 
  324         tid = txBegin(dip->i_sb, 0);
  325 
  326         down(&JFS_IP(dip)->commit_sem);
  327         down(&JFS_IP(ip)->commit_sem);
  328 
  329         iplist[0] = dip;
  330         iplist[1] = ip;
  331 
  332         tblk = tid_to_tblock(tid);
  333         tblk->xflag |= COMMIT_DELETE;
  334         tblk->ip = ip;
  335 
  336         /*
  337          * delete the entry of target directory from parent directory
  338          */
  339         ino = ip->i_ino;
  340         if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
  341                 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
  342                 if (rc == EIO)
  343                         txAbort(tid, 1);
  344                 txEnd(tid);
  345                 up(&JFS_IP(dip)->commit_sem);
  346                 up(&JFS_IP(ip)->commit_sem);
  347 
  348                 goto out2;
  349         }
  350 
  351         /* update parent directory's link count corresponding
  352          * to ".." entry of the target directory deleted
  353          */
  354         dip->i_nlink--;
  355         dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  356         mark_inode_dirty(dip);
  357 
  358         /*
  359          * OS/2 could have created EA and/or ACL
  360          */
  361         /* free EA from both persistent and working map */
  362         if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
  363                 /* free EA pages */
  364                 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
  365         }
  366         JFS_IP(ip)->ea.flag = 0;
  367 
  368         /* free ACL from both persistent and working map */
  369         if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
  370                 /* free ACL pages */
  371                 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
  372         }
  373         JFS_IP(ip)->acl.flag = 0;
  374 
  375         /* mark the target directory as deleted */
  376         ip->i_nlink = 0;
  377         mark_inode_dirty(ip);
  378 
  379         rc = txCommit(tid, 2, &iplist[0], 0);
  380 
  381         txEnd(tid);
  382 
  383         up(&JFS_IP(dip)->commit_sem);
  384         up(&JFS_IP(ip)->commit_sem);
  385 
  386         /*
  387          * Truncating the directory index table is not guaranteed.  It
  388          * may need to be done iteratively
  389          */
  390         if (test_cflag(COMMIT_Stale, dip)) {
  391                 if (dip->i_size > 1)
  392                         jfs_truncate_nolock(dip, 0);
  393 
  394                 clear_cflag(COMMIT_Stale, dip);
  395         }
  396 
  397       out2:
  398         free_UCSname(&dname);
  399 
  400       out:
  401         jfs_info("jfs_rmdir: rc:%d", rc);
  402         return -rc;
  403 }
  404 
  405 /*
  406  * NAME:        jfs_unlink(dip, dentry)
  407  *
  408  * FUNCTION:    remove a link to object <vp> named by <name> 
  409  *              from parent directory <dvp>
  410  *
  411  * PARAMETER:   dip     - inode of parent directory
  412  *              dentry  - dentry of object to be removed
  413  *
  414  * RETURN:      errors from subroutines
  415  *
  416  * note:
  417  * temporary file: if one or more processes have the file open
  418  * when the last link is removed, the link will be removed before
  419  * unlink() returns, but the removal of the file contents will be
  420  * postponed until all references to the files are closed.
  421  *
  422  * JFS does NOT support unlink() on directories.
  423  *
  424  */
  425 int jfs_unlink(struct inode *dip, struct dentry *dentry)
  426 {
  427         int rc;
  428         tid_t tid;              /* transaction id */
  429         struct inode *ip = dentry->d_inode;
  430         ino_t ino;
  431         struct component_name dname;    /* object name */
  432         struct inode *iplist[2];
  433         struct tblock *tblk;
  434         s64 new_size = 0;
  435         int commit_flag;
  436 
  437         jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
  438 
  439         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dip->i_sb)->nls_tab)))
  440                 goto out;
  441 
  442         IWRITE_LOCK(ip);
  443 
  444         tid = txBegin(dip->i_sb, 0);
  445 
  446         down(&JFS_IP(dip)->commit_sem);
  447         down(&JFS_IP(ip)->commit_sem);
  448 
  449         iplist[0] = dip;
  450         iplist[1] = ip;
  451 
  452         /*
  453          * delete the entry of target file from parent directory
  454          */
  455         ino = ip->i_ino;
  456         if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
  457                 jfs_err("jfs_unlink: dtDelete returned %d", rc);
  458                 if (rc == EIO)
  459                         txAbort(tid, 1);        /* Marks FS Dirty */
  460                 txEnd(tid);
  461                 up(&JFS_IP(dip)->commit_sem);
  462                 up(&JFS_IP(ip)->commit_sem);
  463                 IWRITE_UNLOCK(ip);
  464                 goto out1;
  465         }
  466 
  467         ASSERT(ip->i_nlink);
  468 
  469         ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
  470         mark_inode_dirty(dip);
  471 
  472         /* update target's inode */
  473         ip->i_nlink--;
  474         mark_inode_dirty(ip);
  475 
  476         /*
  477          *      commit zero link count object
  478          */
  479         if (ip->i_nlink == 0) {
  480                 assert(!test_cflag(COMMIT_Nolink, ip));
  481                 /* free block resources */
  482                 if ((new_size = commitZeroLink(tid, ip)) < 0) {
  483                         txAbort(tid, 1);        /* Marks FS Dirty */
  484                         txEnd(tid);
  485                         up(&JFS_IP(dip)->commit_sem);
  486                         up(&JFS_IP(ip)->commit_sem);
  487                         IWRITE_UNLOCK(ip);
  488                         rc = -new_size;         /* We return -rc */
  489                         goto out1;
  490                 }
  491                 tblk = tid_to_tblock(tid);
  492                 tblk->xflag |= COMMIT_DELETE;
  493                 tblk->ip = ip;
  494         }
  495 
  496         /*
  497          * Incomplete truncate of file data can
  498          * result in timing problems unless we synchronously commit the
  499          * transaction.
  500          */
  501         if (new_size)
  502                 commit_flag = COMMIT_SYNC;
  503         else
  504                 commit_flag = 0;
  505 
  506         /*
  507          * If xtTruncate was incomplete, commit synchronously to avoid
  508          * timing complications
  509          */
  510         rc = txCommit(tid, 2, &iplist[0], commit_flag);
  511 
  512         txEnd(tid);
  513 
  514         up(&JFS_IP(dip)->commit_sem);
  515         up(&JFS_IP(ip)->commit_sem);
  516 
  517 
  518         while (new_size && (rc == 0)) {
  519                 tid = txBegin(dip->i_sb, 0);
  520                 down(&JFS_IP(ip)->commit_sem);
  521                 new_size = xtTruncate_pmap(tid, ip, new_size);
  522                 if (new_size < 0) {
  523                         txAbort(tid, 1);        /* Marks FS Dirty */
  524                         rc = -new_size;         /* We return -rc */
  525                 } else
  526                         rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
  527                 txEnd(tid);
  528                 up(&JFS_IP(ip)->commit_sem);
  529         }
  530 
  531         if (ip->i_nlink == 0)
  532                 set_cflag(COMMIT_Nolink, ip);
  533 
  534         IWRITE_UNLOCK(ip);
  535 
  536         /*
  537          * Truncating the directory index table is not guaranteed.  It
  538          * may need to be done iteratively
  539          */
  540         if (test_cflag(COMMIT_Stale, dip)) {
  541                 if (dip->i_size > 1)
  542                         jfs_truncate_nolock(dip, 0);
  543 
  544                 clear_cflag(COMMIT_Stale, dip);
  545         }
  546 
  547       out1:
  548         free_UCSname(&dname);
  549       out:
  550         jfs_info("jfs_unlink: rc:%d", -rc);
  551         return -rc;
  552 }
  553 
  554 /*
  555  * NAME:        commitZeroLink()
  556  *
  557  * FUNCTION:    for non-directory, called by jfs_remove(),
  558  *              truncate a regular file, directory or symbolic
  559  *              link to zero length. return 0 if type is not 
  560  *              one of these.
  561  *
  562  *              if the file is currently associated with a VM segment
  563  *              only permanent disk and inode map resources are freed,
  564  *              and neither the inode nor indirect blocks are modified
  565  *              so that the resources can be later freed in the work
  566  *              map by ctrunc1.
  567  *              if there is no VM segment on entry, the resources are
  568  *              freed in both work and permanent map.
  569  *              (? for temporary file - memory object is cached even 
  570  *              after no reference:
  571  *              reference count > 0 -   )
  572  *
  573  * PARAMETERS:  cd      - pointer to commit data structure.
  574  *                        current inode is the one to truncate.
  575  *
  576  * RETURN :     Errors from subroutines
  577  */
  578 s64 commitZeroLink(tid_t tid, struct inode *ip)
  579 {
  580         int filetype;
  581         struct tblock *tblk;
  582 
  583         jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
  584 
  585         filetype = ip->i_mode & S_IFMT;
  586         switch (filetype) {
  587         case S_IFREG:
  588                 break;
  589         case S_IFLNK:
  590                 /* fast symbolic link */
  591                 if (ip->i_size < IDATASIZE) {
  592                         ip->i_size = 0;
  593                         return 0;
  594                 }
  595                 break;
  596         default:
  597                 assert(filetype != S_IFDIR);
  598                 return 0;
  599         }
  600 
  601         set_cflag(COMMIT_Freewmap, ip);
  602 
  603         /* mark transaction of block map update type */
  604         tblk = tid_to_tblock(tid);
  605         tblk->xflag |= COMMIT_PMAP;
  606 
  607         /*
  608          * free EA
  609          */
  610         if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
  611                 /* acquire maplock on EA to be freed from block map */
  612                 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
  613 
  614         /*
  615          * free ACL
  616          */
  617         if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
  618                 /* acquire maplock on EA to be freed from block map */
  619                 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
  620 
  621         /*
  622          * free xtree/data (truncate to zero length):
  623          * free xtree/data pages from cache if COMMIT_PWMAP, 
  624          * free xtree/data blocks from persistent block map, and
  625          * free xtree/data blocks from working block map if COMMIT_PWMAP;
  626          */
  627         if (ip->i_size)
  628                 return xtTruncate_pmap(tid, ip, 0);
  629 
  630         return 0;
  631 }
  632 
  633 
  634 /*
  635  * NAME:        freeZeroLink()
  636  *
  637  * FUNCTION:    for non-directory, called by iClose(),
  638  *              free resources of a file from cache and WORKING map 
  639  *              for a file previously committed with zero link count
  640  *              while associated with a pager object,
  641  *
  642  * PARAMETER:   ip      - pointer to inode of file.
  643  *
  644  * RETURN:      0 -ok
  645  */
  646 int freeZeroLink(struct inode *ip)
  647 {
  648         int rc = 0;
  649         int type;
  650 
  651         jfs_info("freeZeroLink: ip = 0x%p", ip);
  652 
  653         /* return if not reg or symbolic link or if size is
  654          * already ok.
  655          */
  656         type = ip->i_mode & S_IFMT;
  657 
  658         switch (type) {
  659         case S_IFREG:
  660                 break;
  661         case S_IFLNK:
  662                 /* if its contained in inode nothing to do */
  663                 if (ip->i_size < IDATASIZE)
  664                         return 0;
  665                 break;
  666         default:
  667                 return 0;
  668         }
  669 
  670         /*
  671          * free EA
  672          */
  673         if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
  674                 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
  675                 int xlen = lengthDXD(&JFS_IP(ip)->ea);
  676                 struct maplock maplock; /* maplock for COMMIT_WMAP */
  677                 struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
  678 
  679                 /* free EA pages from cache */
  680                 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
  681 
  682                 /* free EA extent from working block map */
  683                 maplock.index = 1;
  684                 pxdlock = (struct pxd_lock *) & maplock;
  685                 pxdlock->flag = mlckFREEPXD;
  686                 PXDaddress(&pxdlock->pxd, xaddr);
  687                 PXDlength(&pxdlock->pxd, xlen);
  688                 txFreeMap(ip, pxdlock, 0, COMMIT_WMAP);
  689         }
  690 
  691         /*
  692          * free ACL
  693          */
  694         if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
  695                 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
  696                 int xlen = lengthDXD(&JFS_IP(ip)->acl);
  697                 struct maplock maplock; /* maplock for COMMIT_WMAP */
  698                 struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
  699 
  700                 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
  701 
  702                 /* free ACL extent from working block map */
  703                 maplock.index = 1;
  704                 pxdlock = (struct pxd_lock *) & maplock;
  705                 pxdlock->flag = mlckFREEPXD;
  706                 PXDaddress(&pxdlock->pxd, xaddr);
  707                 PXDlength(&pxdlock->pxd, xlen);
  708                 txFreeMap(ip, pxdlock, 0, COMMIT_WMAP);
  709         }
  710 
  711         /*
  712          * free xtree/data (truncate to zero length):
  713          * free xtree/data pages from cache, and
  714          * free xtree/data blocks from working block map;
  715          */
  716         if (ip->i_size)
  717                 rc = xtTruncate(0, ip, 0, COMMIT_WMAP);
  718 
  719         return rc;
  720 }
  721 
  722 /*
  723  * NAME:        jfs_link(vp, dvp, name, crp)
  724  *
  725  * FUNCTION:    create a link to <vp> by the name = <name>
  726  *              in the parent directory <dvp>
  727  *
  728  * PARAMETER:   vp      - target object
  729  *              dvp     - parent directory of new link
  730  *              name    - name of new link to target object
  731  *              crp     - credential
  732  *
  733  * RETURN:      Errors from subroutines
  734  *
  735  * note:
  736  * JFS does NOT support link() on directories (to prevent circular
  737  * path in the directory hierarchy);
  738  * EPERM: the target object is a directory, and either the caller
  739  * does not have appropriate privileges or the implementation prohibits
  740  * using link() on directories [XPG4.2].
  741  *
  742  * JFS does NOT support links between file systems:
  743  * EXDEV: target object and new link are on different file systems and
  744  * implementation does not support links between file systems [XPG4.2].
  745  */
  746 int jfs_link(struct dentry *old_dentry,
  747              struct inode *dir, struct dentry *dentry)
  748 {
  749         int rc;
  750         tid_t tid;
  751         struct inode *ip = old_dentry->d_inode;
  752         ino_t ino;
  753         struct component_name dname;
  754         struct btstack btstack;
  755         struct inode *iplist[2];
  756 
  757         jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
  758                  dentry->d_name.name);
  759 
  760         /* JFS does NOT support link() on directories */
  761         if (S_ISDIR(ip->i_mode))
  762                 return -EPERM;
  763 
  764         tid = txBegin(ip->i_sb, 0);
  765 
  766         down(&JFS_IP(dir)->commit_sem);
  767         down(&JFS_IP(ip)->commit_sem);
  768 
  769         if (ip->i_nlink == JFS_LINK_MAX) {
  770                 rc = EMLINK;
  771                 goto out;
  772         }
  773 
  774         /*
  775          * scan parent directory for entry/freespace
  776          */
  777         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(ip->i_sb)->nls_tab)))
  778                 goto out;
  779 
  780         if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
  781                 goto out;
  782 
  783         /*
  784          * create entry for new link in parent directory
  785          */
  786         ino = ip->i_ino;
  787         if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
  788                 goto out;
  789 
  790         /* update object inode */
  791         ip->i_nlink++;          /* for new link */
  792         ip->i_ctime = CURRENT_TIME;
  793         mark_inode_dirty(dir);
  794         atomic_inc(&ip->i_count);
  795         d_instantiate(dentry, ip);
  796 
  797         iplist[0] = ip;
  798         iplist[1] = dir;
  799         rc = txCommit(tid, 2, &iplist[0], 0);
  800 
  801       out:
  802         txEnd(tid);
  803 
  804         up(&JFS_IP(dir)->commit_sem);
  805         up(&JFS_IP(ip)->commit_sem);
  806 
  807         jfs_info("jfs_link: rc:%d", rc);
  808         return -rc;
  809 }
  810 
  811 /*
  812  * NAME:        jfs_symlink(dip, dentry, name)
  813  *
  814  * FUNCTION:    creates a symbolic link to <symlink> by name <name>
  815  *                      in directory <dip>
  816  *
  817  * PARAMETER:   dip         - parent directory vnode
  818  *                      dentry  - dentry of symbolic link
  819  *                      name    - the path name of the existing object 
  820  *                                    that will be the source of the link
  821  *
  822  * RETURN:      errors from subroutines
  823  *
  824  * note:
  825  * ENAMETOOLONG: pathname resolution of a symbolic link produced
  826  * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
  827 */
  828 
  829 int jfs_symlink(struct inode *dip, struct dentry *dentry, const char *name)
  830 {
  831         int rc;
  832         tid_t tid;
  833         ino_t ino = 0;
  834         struct component_name dname;
  835         int ssize;              /* source pathname size */
  836         struct btstack btstack;
  837         struct inode *ip = dentry->d_inode;
  838         unchar *i_fastsymlink;
  839         s64 xlen = 0;
  840         int bmask = 0, xsize;
  841         s64 xaddr;
  842         struct metapage *mp;
  843         struct super_block *sb;
  844         struct tblock *tblk;
  845 
  846         struct inode *iplist[2];
  847 
  848         jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
  849 
  850         ssize = strlen(name) + 1;
  851 
  852         /*
  853          * search parent directory for entry/freespace
  854          * (dtSearch() returns parent directory page pinned)
  855          */
  856 
  857         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dip->i_sb)->nls_tab)))
  858                 goto out1;
  859 
  860         /*
  861          * allocate on-disk/in-memory inode for symbolic link:
  862          * (iAlloc() returns new, locked inode)
  863          */
  864         ip = ialloc(dip, S_IFLNK | 0777);
  865         if (ip == NULL) {
  866                 rc = ENOSPC;
  867                 goto out2;
  868         }
  869 
  870         tid = txBegin(dip->i_sb, 0);
  871 
  872         down(&JFS_IP(dip)->commit_sem);
  873         down(&JFS_IP(ip)->commit_sem);
  874 
  875         if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE)))
  876                 goto out3;
  877 
  878         tblk = tid_to_tblock(tid);
  879         tblk->xflag |= COMMIT_CREATE;
  880         tblk->ip = ip;
  881 
  882         /*
  883          * create entry for symbolic link in parent directory
  884          */
  885 
  886         ino = ip->i_ino;
  887 
  888 
  889 
  890         if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
  891                 jfs_err("jfs_symlink: dtInsert returned %d", rc);
  892                 /* discard ne inode */
  893                 goto out3;
  894 
  895         }
  896 
  897         /* fix symlink access permission
  898          * (dir_create() ANDs in the u.u_cmask, 
  899          * but symlinks really need to be 777 access)
  900          */
  901         ip->i_mode |= 0777;
  902 
  903         /*
  904            *       write symbolic link target path name
  905          */
  906         xtInitRoot(tid, ip);
  907 
  908         /*
  909          * write source path name inline in on-disk inode (fast symbolic link)
  910          */
  911 
  912         if (ssize <= IDATASIZE) {
  913                 ip->i_op = &jfs_symlink_inode_operations;
  914 
  915                 i_fastsymlink = JFS_IP(ip)->i_inline;
  916                 memcpy(i_fastsymlink, name, ssize);
  917                 ip->i_size = ssize - 1;
  918 
  919                 /*
  920                  * if symlink is > 128 bytes, we don't have the space to
  921                  * store inline extended attributes
  922                  */
  923                 if (ssize > sizeof (JFS_IP(ip)->i_inline))
  924                         JFS_IP(ip)->mode2 &= ~INLINEEA;
  925 
  926                 jfs_info("jfs_symlink: fast symlink added  ssize:%d name:%s ",
  927                          ssize, name);
  928         }
  929         /*
  930          * write source path name in a single extent
  931          */
  932         else {
  933                 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
  934 
  935                 ip->i_op = &page_symlink_inode_operations;
  936                 ip->i_mapping->a_ops = &jfs_aops;
  937 
  938                 /*
  939                  * even though the data of symlink object (source 
  940                  * path name) is treated as non-journaled user data,
  941                  * it is read/written thru buffer cache for performance.
  942                  */
  943                 sb = ip->i_sb;
  944                 bmask = JFS_SBI(sb)->bsize - 1;
  945                 xsize = (ssize + bmask) & ~bmask;
  946                 xaddr = 0;
  947                 xlen = xsize >> JFS_SBI(sb)->l2bsize;
  948                 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0)) == 0) {
  949                         ip->i_size = ssize - 1;
  950                         while (ssize) {
  951                                 int copy_size = min(ssize, PSIZE);
  952 
  953                                 mp = get_metapage(ip, xaddr, PSIZE, 1);
  954 
  955                                 if (mp == NULL) {
  956                                         dtDelete(tid, dip, &dname, &ino,
  957                                                  JFS_REMOVE);
  958                                         rc = EIO;
  959                                         goto out3;
  960                                 }
  961                                 memcpy(mp->data, name, copy_size);
  962                                 flush_metapage(mp);
  963 #if 0
  964                                 mark_buffer_uptodate(bp, 1);
  965                                 mark_buffer_dirty(bp, 1);
  966                                 if (IS_SYNC(dip)) {
  967                                         ll_rw_block(WRITE, 1, &bp);
  968                                         wait_on_buffer(bp);
  969                                 }
  970                                 brelse(bp);
  971 #endif                          /* 0 */
  972                                 ssize -= copy_size;
  973                                 xaddr += JFS_SBI(sb)->nbperpage;
  974                         }
  975                         ip->i_blocks = LBLK2PBLK(sb, xlen);
  976                 } else {
  977                         dtDelete(tid, dip, &dname, &ino, JFS_REMOVE);
  978                         rc = ENOSPC;
  979                         goto out3;
  980                 }
  981         }
  982 
  983         insert_inode_hash(ip);
  984         mark_inode_dirty(ip);
  985         d_instantiate(dentry, ip);
  986 
  987         /*
  988          * commit update of parent directory and link object
  989          *
  990          * if extent allocation failed (ENOSPC),
  991          * the parent inode is committed regardless to avoid
  992          * backing out parent directory update (by dtInsert())
  993          * and subsequent dtDelete() which is harmless wrt 
  994          * integrity concern.  
  995          * the symlink inode will be freed by iput() at exit
  996          * as it has a zero link count (by dtDelete()) and 
  997          * no permanant resources. 
  998          */
  999 
 1000         iplist[0] = dip;
 1001         if (rc == 0) {
 1002                 iplist[1] = ip;
 1003                 rc = txCommit(tid, 2, &iplist[0], 0);
 1004         } else
 1005                 rc = txCommit(tid, 1, &iplist[0], 0);
 1006 
 1007       out3:
 1008         txEnd(tid);
 1009         up(&JFS_IP(dip)->commit_sem);
 1010         up(&JFS_IP(ip)->commit_sem);
 1011         if (rc) {
 1012                 ip->i_nlink = 0;
 1013                 iput(ip);
 1014         }
 1015 
 1016       out2:
 1017         free_UCSname(&dname);
 1018 
 1019       out1:
 1020         jfs_info("jfs_symlink: rc:%d", -rc);
 1021         return -rc;
 1022 }
 1023 
 1024 
 1025 /*
 1026  * NAME:        jfs_rename
 1027  *
 1028  * FUNCTION:    rename a file or directory
 1029  */
 1030 int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
 1031                struct inode *new_dir, struct dentry *new_dentry)
 1032 {
 1033         struct btstack btstack;
 1034         ino_t ino;
 1035         struct component_name new_dname;
 1036         struct inode *new_ip;
 1037         struct component_name old_dname;
 1038         struct inode *old_ip;
 1039         int rc;
 1040         tid_t tid;
 1041         struct tlock *tlck;
 1042         struct dt_lock *dtlck;
 1043         struct lv *lv;
 1044         int ipcount;
 1045         struct inode *iplist[4];
 1046         struct tblock *tblk;
 1047         s64 new_size = 0;
 1048         int commit_flag;
 1049 
 1050 
 1051         jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
 1052                  new_dentry->d_name.name);
 1053 
 1054         old_ip = old_dentry->d_inode;
 1055         new_ip = new_dentry->d_inode;
 1056 
 1057         if ((rc = get_UCSname(&old_dname, old_dentry,
 1058                               JFS_SBI(old_dir->i_sb)->nls_tab)))
 1059                 goto out1;
 1060 
 1061         if ((rc = get_UCSname(&new_dname, new_dentry,
 1062                               JFS_SBI(old_dir->i_sb)->nls_tab)))
 1063                 goto out2;
 1064 
 1065         /*
 1066          * Make sure source inode number is what we think it is
 1067          */
 1068         rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
 1069         if (rc || (ino != old_ip->i_ino)) {
 1070                 rc = ENOENT;
 1071                 goto out3;
 1072         }
 1073 
 1074         /*
 1075          * Make sure dest inode number (if any) is what we think it is
 1076          */
 1077         rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
 1078         if (rc == 0) {
 1079                 if ((new_ip == 0) || (ino != new_ip->i_ino)) {
 1080                         rc = ESTALE;
 1081                         goto out3;
 1082                 }
 1083         } else if (rc != ENOENT)
 1084                 goto out3;
 1085         else if (new_ip) {
 1086                 /* no entry exists, but one was expected */
 1087                 rc = ESTALE;
 1088                 goto out3;
 1089         }
 1090 
 1091         if (S_ISDIR(old_ip->i_mode)) {
 1092                 if (new_ip) {
 1093                         if (!dtEmpty(new_ip)) {
 1094                                 rc = ENOTEMPTY;
 1095                                 goto out3;
 1096                         }
 1097                 } else if ((new_dir != old_dir) &&
 1098                            (new_dir->i_nlink == JFS_LINK_MAX)) {
 1099                         rc = EMLINK;
 1100                         goto out3;
 1101                 }
 1102         } else if (new_ip)
 1103                 IWRITE_LOCK(new_ip);
 1104 
 1105         /*
 1106          * The real work starts here
 1107          */
 1108         tid = txBegin(new_dir->i_sb, 0);
 1109 
 1110         down(&JFS_IP(new_dir)->commit_sem);
 1111         down(&JFS_IP(old_ip)->commit_sem);
 1112         if (old_dir != new_dir)
 1113                 down(&JFS_IP(old_dir)->commit_sem);
 1114 
 1115         if (new_ip) {
 1116                 down(&JFS_IP(new_ip)->commit_sem);
 1117                 /*
 1118                  * Change existing directory entry to new inode number
 1119                  */
 1120                 ino = new_ip->i_ino;
 1121                 rc = dtModify(tid, new_dir, &new_dname, &ino,
 1122                               old_ip->i_ino, JFS_RENAME);
 1123                 if (rc)
 1124                         goto out4;
 1125                 new_ip->i_nlink--;
 1126                 if (S_ISDIR(new_ip->i_mode)) {
 1127                         new_ip->i_nlink--;
 1128                         assert(new_ip->i_nlink == 0);
 1129                         tblk = tid_to_tblock(tid);
 1130                         tblk->xflag |= COMMIT_DELETE;
 1131                         tblk->ip = new_ip;
 1132                 } else if (new_ip->i_nlink == 0) {
 1133                         assert(!test_cflag(COMMIT_Nolink, new_ip));
 1134                         /* free block resources */
 1135                         if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
 1136                                 txAbort(tid, 1);        /* Marks FS Dirty */
 1137                                 rc = -new_size;         /* We return -rc */
 1138                                 goto out4;
 1139                         }
 1140                         tblk = tid_to_tblock(tid);
 1141                         tblk->xflag |= COMMIT_DELETE;
 1142                         tblk->ip = new_ip;
 1143                 } else {
 1144                         new_ip->i_ctime = CURRENT_TIME;
 1145                         mark_inode_dirty(new_ip);
 1146                 }
 1147         } else {
 1148                 /*
 1149                  * Add new directory entry
 1150                  */
 1151                 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
 1152                               JFS_CREATE);
 1153                 if (rc) {
 1154                         jfs_err("jfs_rename didn't expect dtSearch to fail "
 1155                                 "w/rc = %d", rc);
 1156                         goto out4;
 1157                 }
 1158 
 1159                 ino = old_ip->i_ino;
 1160                 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
 1161                 if (rc) {
 1162                         jfs_err("jfs_rename: dtInsert failed w/rc = %d",
 1163                                 rc);
 1164                         goto out4;
 1165                 }
 1166                 if (S_ISDIR(old_ip->i_mode))
 1167                         new_dir->i_nlink++;
 1168         }
 1169         /*
 1170          * Remove old directory entry
 1171          */
 1172 
 1173         ino = old_ip->i_ino;
 1174         rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
 1175         if (rc) {
 1176                 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
 1177                         rc);
 1178                 txAbort(tid, 1);        /* Marks Filesystem dirty */
 1179                 goto out4;
 1180         }
 1181         if (S_ISDIR(old_ip->i_mode)) {
 1182                 old_dir->i_nlink--;
 1183                 if (old_dir != new_dir) {
 1184                         /*
 1185                          * Change inode number of parent for moved directory
 1186                          */
 1187 
 1188                         JFS_IP(old_ip)->i_dtroot.header.idotdot =
 1189                                 cpu_to_le32(new_dir->i_ino);
 1190 
 1191                         /* Linelock header of dtree */
 1192                         tlck = txLock(tid, old_ip,
 1193                                     (struct metapage *) &JFS_IP(old_ip)->bxflag,
 1194                                       tlckDTREE | tlckBTROOT);
 1195                         dtlck = (struct dt_lock *) & tlck->lock;
 1196                         ASSERT(dtlck->index == 0);
 1197                         lv = & dtlck->lv[0];
 1198                         lv->offset = 0;
 1199                         lv->length = 1;
 1200                         dtlck->index++;
 1201                 }
 1202         }
 1203 
 1204         /*
 1205          * Update ctime on changed/moved inodes & mark dirty
 1206          */
 1207         old_ip->i_ctime = CURRENT_TIME;
 1208         mark_inode_dirty(old_ip);
 1209 
 1210         new_dir->i_ctime = CURRENT_TIME;
 1211         mark_inode_dirty(new_dir);
 1212 
 1213         /* Build list of inodes modified by this transaction */
 1214         ipcount = 0;
 1215         iplist[ipcount++] = old_ip;
 1216         if (new_ip)
 1217                 iplist[ipcount++] = new_ip;
 1218         iplist[ipcount++] = old_dir;
 1219 
 1220         if (old_dir != new_dir) {
 1221                 iplist[ipcount++] = new_dir;
 1222                 old_dir->i_ctime = CURRENT_TIME;
 1223                 mark_inode_dirty(old_dir);
 1224         }
 1225 
 1226         /*
 1227          * Incomplete truncate of file data can
 1228          * result in timing problems unless we synchronously commit the
 1229          * transaction.
 1230          */
 1231         if (new_size)
 1232                 commit_flag = COMMIT_SYNC;
 1233         else
 1234                 commit_flag = 0;
 1235 
 1236         rc = txCommit(tid, ipcount, iplist, commit_flag);
 1237 
 1238       out4:
 1239         txEnd(tid);
 1240 
 1241         up(&JFS_IP(new_dir)->commit_sem);
 1242         up(&JFS_IP(old_ip)->commit_sem);
 1243         if (old_dir != new_dir)
 1244                 up(&JFS_IP(old_dir)->commit_sem);
 1245         if (new_ip)
 1246                 up(&JFS_IP(new_ip)->commit_sem);
 1247 
 1248         while (new_size && (rc == 0)) {
 1249                 tid = txBegin(new_ip->i_sb, 0);
 1250                 down(&JFS_IP(new_ip)->commit_sem);
 1251                 new_size = xtTruncate_pmap(tid, new_ip, new_size);
 1252                 if (new_size < 0) {
 1253                         txAbort(tid, 1);
 1254                         rc = -new_size;         /* We return -rc */
 1255                 } else
 1256                         rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
 1257                 txEnd(tid);
 1258                 up(&JFS_IP(new_ip)->commit_sem);
 1259         }
 1260         if (new_ip && (new_ip->i_nlink == 0))
 1261                 set_cflag(COMMIT_Nolink, new_ip);
 1262       out3:
 1263         free_UCSname(&new_dname);
 1264       out2:
 1265         free_UCSname(&old_dname);
 1266       out1:
 1267         if (new_ip && !S_ISDIR(new_ip->i_mode))
 1268                 IWRITE_UNLOCK(new_ip);
 1269         /*
 1270          * Truncating the directory index table is not guaranteed.  It
 1271          * may need to be done iteratively
 1272          */
 1273         if (test_cflag(COMMIT_Stale, old_dir)) {
 1274                 if (old_dir->i_size > 1)
 1275                         jfs_truncate_nolock(old_dir, 0);
 1276 
 1277                 clear_cflag(COMMIT_Stale, old_dir);
 1278         }
 1279 
 1280         jfs_info("jfs_rename: returning %d", rc);
 1281         return -rc;
 1282 }
 1283 
 1284 
 1285 /*
 1286  * NAME:        jfs_mknod
 1287  *
 1288  * FUNCTION:    Create a special file (device)
 1289  */
 1290 int jfs_mknod(struct inode *dir, struct dentry *dentry, int mode, int rdev)
 1291 {
 1292         struct btstack btstack;
 1293         struct component_name dname;
 1294         ino_t ino;
 1295         struct inode *ip;
 1296         struct inode *iplist[2];
 1297         int rc;
 1298         tid_t tid;
 1299         struct tblock *tblk;
 1300 
 1301         jfs_info("jfs_mknod: %s", dentry->d_name.name);
 1302 
 1303         if ((rc = get_UCSname(&dname, dentry, JFS_SBI(dir->i_sb)->nls_tab)))
 1304                 goto out;
 1305 
 1306         ip = ialloc(dir, mode);
 1307         if (ip == NULL) {
 1308                 rc = ENOSPC;
 1309                 goto out1;
 1310         }
 1311 
 1312         tid = txBegin(dir->i_sb, 0);
 1313 
 1314         down(&JFS_IP(dir)->commit_sem);
 1315         down(&JFS_IP(ip)->commit_sem);
 1316 
 1317         if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
 1318                 goto out3;
 1319 
 1320         tblk = tid_to_tblock(tid);
 1321         tblk->xflag |= COMMIT_CREATE;
 1322         tblk->ip = ip;
 1323 
 1324         ino = ip->i_ino;
 1325         if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
 1326                 goto out3;
 1327 
 1328         ip->i_op = &jfs_file_inode_operations;
 1329         init_special_inode(ip, ip->i_mode, rdev);
 1330 
 1331         insert_inode_hash(ip);
 1332         mark_inode_dirty(ip);
 1333         d_instantiate(dentry, ip);
 1334 
 1335         dir->i_ctime = dir->i_mtime = CURRENT_TIME;
 1336 
 1337         mark_inode_dirty(dir);
 1338 
 1339         iplist[0] = dir;
 1340         iplist[1] = ip;
 1341         rc = txCommit(tid, 2, iplist, 0);
 1342 
 1343       out3:
 1344         txEnd(tid);
 1345         up(&JFS_IP(ip)->commit_sem);
 1346         up(&JFS_IP(dir)->commit_sem);
 1347         if (rc) {
 1348                 ip->i_nlink = 0;
 1349                 iput(ip);
 1350         }
 1351 
 1352       out1:
 1353         free_UCSname(&dname);
 1354 
 1355       out:
 1356         jfs_info("jfs_mknod: returning %d", rc);
 1357         return -rc;
 1358 }
 1359 
 1360 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry)
 1361 {
 1362         struct btstack btstack;
 1363         ino_t inum;
 1364         struct inode *ip;
 1365         struct component_name key;
 1366         const char *name = dentry->d_name.name;
 1367         int len = dentry->d_name.len;
 1368         int rc;
 1369 
 1370         jfs_info("jfs_lookup: name = %s", name);
 1371 
 1372 
 1373         if ((name[0] == '.') && (len == 1))
 1374                 inum = dip->i_ino;
 1375         else if (strcmp(name, "..") == 0)
 1376                 inum = PARENT(dip);
 1377         else {
 1378                 if ((rc =
 1379                      get_UCSname(&key, dentry, JFS_SBI(dip->i_sb)->nls_tab)))
 1380                         return ERR_PTR(-rc);
 1381                 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
 1382                 free_UCSname(&key);
 1383                 if (rc == ENOENT) {
 1384                         d_add(dentry, NULL);
 1385                         return ERR_PTR(0);
 1386                 } else if (rc) {
 1387                         jfs_err("jfs_lookup: dtSearch returned %d", rc);
 1388                         return ERR_PTR(-rc);
 1389                 }
 1390         }
 1391 
 1392         ip = iget(dip->i_sb, inum);
 1393         if (ip == NULL) {
 1394                 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
 1395                 return ERR_PTR(-EACCES);
 1396         }
 1397         if (is_bad_inode(ip)) {
 1398                 jfs_err("jfs_lookup: iget returned bad inode, inum = %d",
 1399                         (uint) inum);
 1400                 iput(ip);
 1401                 return ERR_PTR(-EACCES);
 1402         }
 1403 
 1404         d_add(dentry, ip);
 1405 
 1406         return ERR_PTR(0);
 1407 }
 1408 
 1409 struct inode_operations jfs_dir_inode_operations = {
 1410         .create         = jfs_create,
 1411         .lookup         = jfs_lookup,
 1412         .link           = jfs_link,
 1413         .unlink         = jfs_unlink,
 1414         .symlink        = jfs_symlink,
 1415         .mkdir          = jfs_mkdir,
 1416         .rmdir          = jfs_rmdir,
 1417         .mknod          = jfs_mknod,
 1418         .rename         = jfs_rename,
 1419         .setxattr       = jfs_setxattr,
 1420         .getxattr       = jfs_getxattr,
 1421         .listxattr      = jfs_listxattr,
 1422         .removexattr    = jfs_removexattr,
 1423 };
 1424 
 1425 struct file_operations jfs_dir_operations = {
 1426         .read           = generic_read_dir,
 1427         .readdir        = jfs_readdir,
 1428         .fsync          = jfs_fsync,
 1429 };

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