~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/jfs/namei.c

Version: ~ [ linux-5.5-rc6 ] ~ [ linux-5.4.11 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.95 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.164 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.209 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.209 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.81 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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  */
 39 const struct dentry_operations jfs_ci_dentry_operations;
 40 
 41 static 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  */
 49 static 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  */
 75 static 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:%pd", dip, dentry);
 88 
 89         rc = dquot_initialize(dip);
 90         if (rc)
 91                 goto out1;
 92 
 93         /*
 94          * search parent directory for entry/freespace
 95          * (dtSearch() returns parent directory page pinned)
 96          */
 97         if ((rc = get_UCSname(&dname, dentry)))
 98                 goto out1;
 99 
100         /*
101          * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
102          * block there while holding dtree page, so we allocate the inode &
103          * begin the transaction before we search the directory.
104          */
105         ip = ialloc(dip, mode);
106         if (IS_ERR(ip)) {
107                 rc = PTR_ERR(ip);
108                 goto out2;
109         }
110 
111         tid = txBegin(dip->i_sb, 0);
112 
113         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
114         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
115 
116         rc = jfs_init_acl(tid, ip, dip);
117         if (rc)
118                 goto out3;
119 
120         rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
121         if (rc) {
122                 txAbort(tid, 0);
123                 goto out3;
124         }
125 
126         if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
127                 jfs_err("jfs_create: dtSearch returned %d", rc);
128                 txAbort(tid, 0);
129                 goto out3;
130         }
131 
132         tblk = tid_to_tblock(tid);
133         tblk->xflag |= COMMIT_CREATE;
134         tblk->ino = ip->i_ino;
135         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
136 
137         iplist[0] = dip;
138         iplist[1] = ip;
139 
140         /*
141          * initialize the child XAD tree root in-line in inode
142          */
143         xtInitRoot(tid, ip);
144 
145         /*
146          * create entry in parent directory for child directory
147          * (dtInsert() releases parent directory page)
148          */
149         ino = ip->i_ino;
150         if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
151                 if (rc == -EIO) {
152                         jfs_err("jfs_create: dtInsert returned -EIO");
153                         txAbort(tid, 1);        /* Marks Filesystem dirty */
154                 } else
155                         txAbort(tid, 0);        /* Filesystem full */
156                 goto out3;
157         }
158 
159         ip->i_op = &jfs_file_inode_operations;
160         ip->i_fop = &jfs_file_operations;
161         ip->i_mapping->a_ops = &jfs_aops;
162 
163         mark_inode_dirty(ip);
164 
165         dip->i_ctime = dip->i_mtime = current_time(dip);
166 
167         mark_inode_dirty(dip);
168 
169         rc = txCommit(tid, 2, &iplist[0], 0);
170 
171       out3:
172         txEnd(tid);
173         mutex_unlock(&JFS_IP(ip)->commit_mutex);
174         mutex_unlock(&JFS_IP(dip)->commit_mutex);
175         if (rc) {
176                 free_ea_wmap(ip);
177                 clear_nlink(ip);
178                 unlock_new_inode(ip);
179                 iput(ip);
180         } else {
181                 unlock_new_inode(ip);
182                 d_instantiate(dentry, ip);
183         }
184 
185       out2:
186         free_UCSname(&dname);
187 
188       out1:
189 
190         jfs_info("jfs_create: rc:%d", rc);
191         return rc;
192 }
193 
194 
195 /*
196  * NAME:        jfs_mkdir(dip, dentry, mode)
197  *
198  * FUNCTION:    create a child directory in the parent directory <dip>
199  *              with name = <from dentry> and mode = <mode>
200  *
201  * PARAMETER:   dip     - parent directory vnode
202  *              dentry  - dentry of child directory
203  *              mode    - create mode (rwxrwxrwx).
204  *
205  * RETURN:      Errors from subroutines
206  *
207  * note:
208  * EACCESS: user needs search+write permission on the parent directory
209  */
210 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
211 {
212         int rc = 0;
213         tid_t tid;              /* transaction id */
214         struct inode *ip = NULL;        /* child directory inode */
215         ino_t ino;
216         struct component_name dname;    /* child directory name */
217         struct btstack btstack;
218         struct inode *iplist[2];
219         struct tblock *tblk;
220 
221         jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry);
222 
223         rc = dquot_initialize(dip);
224         if (rc)
225                 goto out1;
226 
227         /*
228          * search parent directory for entry/freespace
229          * (dtSearch() returns parent directory page pinned)
230          */
231         if ((rc = get_UCSname(&dname, dentry)))
232                 goto out1;
233 
234         /*
235          * Either iAlloc() or txBegin() may block.  Deadlock can occur if we
236          * block there while holding dtree page, so we allocate the inode &
237          * begin the transaction before we search the directory.
238          */
239         ip = ialloc(dip, S_IFDIR | mode);
240         if (IS_ERR(ip)) {
241                 rc = PTR_ERR(ip);
242                 goto out2;
243         }
244 
245         tid = txBegin(dip->i_sb, 0);
246 
247         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
248         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
249 
250         rc = jfs_init_acl(tid, ip, dip);
251         if (rc)
252                 goto out3;
253 
254         rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
255         if (rc) {
256                 txAbort(tid, 0);
257                 goto out3;
258         }
259 
260         if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
261                 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
262                 txAbort(tid, 0);
263                 goto out3;
264         }
265 
266         tblk = tid_to_tblock(tid);
267         tblk->xflag |= COMMIT_CREATE;
268         tblk->ino = ip->i_ino;
269         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
270 
271         iplist[0] = dip;
272         iplist[1] = ip;
273 
274         /*
275          * initialize the child directory in-line in inode
276          */
277         dtInitRoot(tid, ip, dip->i_ino);
278 
279         /*
280          * create entry in parent directory for child directory
281          * (dtInsert() releases parent directory page)
282          */
283         ino = ip->i_ino;
284         if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
285                 if (rc == -EIO) {
286                         jfs_err("jfs_mkdir: dtInsert returned -EIO");
287                         txAbort(tid, 1);        /* Marks Filesystem dirty */
288                 } else
289                         txAbort(tid, 0);        /* Filesystem full */
290                 goto out3;
291         }
292 
293         set_nlink(ip, 2);       /* for '.' */
294         ip->i_op = &jfs_dir_inode_operations;
295         ip->i_fop = &jfs_dir_operations;
296 
297         mark_inode_dirty(ip);
298 
299         /* update parent directory inode */
300         inc_nlink(dip);         /* for '..' from child directory */
301         dip->i_ctime = dip->i_mtime = current_time(dip);
302         mark_inode_dirty(dip);
303 
304         rc = txCommit(tid, 2, &iplist[0], 0);
305 
306       out3:
307         txEnd(tid);
308         mutex_unlock(&JFS_IP(ip)->commit_mutex);
309         mutex_unlock(&JFS_IP(dip)->commit_mutex);
310         if (rc) {
311                 free_ea_wmap(ip);
312                 clear_nlink(ip);
313                 unlock_new_inode(ip);
314                 iput(ip);
315         } else {
316                 unlock_new_inode(ip);
317                 d_instantiate(dentry, ip);
318         }
319 
320       out2:
321         free_UCSname(&dname);
322 
323 
324       out1:
325 
326         jfs_info("jfs_mkdir: rc:%d", rc);
327         return rc;
328 }
329 
330 /*
331  * NAME:        jfs_rmdir(dip, dentry)
332  *
333  * FUNCTION:    remove a link to child directory
334  *
335  * PARAMETER:   dip     - parent inode
336  *              dentry  - child directory dentry
337  *
338  * RETURN:      -EINVAL - if name is . or ..
339  *              -EINVAL - if . or .. exist but are invalid.
340  *              errors from subroutines
341  *
342  * note:
343  * if other threads have the directory open when the last link
344  * is removed, the "." and ".." entries, if present, are removed before
345  * rmdir() returns and no new entries may be created in the directory,
346  * but the directory is not removed until the last reference to
347  * the directory is released (cf.unlink() of regular file).
348  */
349 static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
350 {
351         int rc;
352         tid_t tid;              /* transaction id */
353         struct inode *ip = d_inode(dentry);
354         ino_t ino;
355         struct component_name dname;
356         struct inode *iplist[2];
357         struct tblock *tblk;
358 
359         jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry);
360 
361         /* Init inode for quota operations. */
362         rc = dquot_initialize(dip);
363         if (rc)
364                 goto out;
365         rc = dquot_initialize(ip);
366         if (rc)
367                 goto out;
368 
369         /* directory must be empty to be removed */
370         if (!dtEmpty(ip)) {
371                 rc = -ENOTEMPTY;
372                 goto out;
373         }
374 
375         if ((rc = get_UCSname(&dname, dentry))) {
376                 goto out;
377         }
378 
379         tid = txBegin(dip->i_sb, 0);
380 
381         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
382         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
383 
384         iplist[0] = dip;
385         iplist[1] = ip;
386 
387         tblk = tid_to_tblock(tid);
388         tblk->xflag |= COMMIT_DELETE;
389         tblk->u.ip = ip;
390 
391         /*
392          * delete the entry of target directory from parent directory
393          */
394         ino = ip->i_ino;
395         if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
396                 jfs_err("jfs_rmdir: dtDelete returned %d", rc);
397                 if (rc == -EIO)
398                         txAbort(tid, 1);
399                 txEnd(tid);
400                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
401                 mutex_unlock(&JFS_IP(dip)->commit_mutex);
402 
403                 goto out2;
404         }
405 
406         /* update parent directory's link count corresponding
407          * to ".." entry of the target directory deleted
408          */
409         dip->i_ctime = dip->i_mtime = current_time(dip);
410         inode_dec_link_count(dip);
411 
412         /*
413          * OS/2 could have created EA and/or ACL
414          */
415         /* free EA from both persistent and working map */
416         if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
417                 /* free EA pages */
418                 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
419         }
420         JFS_IP(ip)->ea.flag = 0;
421 
422         /* free ACL from both persistent and working map */
423         if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
424                 /* free ACL pages */
425                 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
426         }
427         JFS_IP(ip)->acl.flag = 0;
428 
429         /* mark the target directory as deleted */
430         clear_nlink(ip);
431         mark_inode_dirty(ip);
432 
433         rc = txCommit(tid, 2, &iplist[0], 0);
434 
435         txEnd(tid);
436 
437         mutex_unlock(&JFS_IP(ip)->commit_mutex);
438         mutex_unlock(&JFS_IP(dip)->commit_mutex);
439 
440         /*
441          * Truncating the directory index table is not guaranteed.  It
442          * may need to be done iteratively
443          */
444         if (test_cflag(COMMIT_Stale, dip)) {
445                 if (dip->i_size > 1)
446                         jfs_truncate_nolock(dip, 0);
447 
448                 clear_cflag(COMMIT_Stale, dip);
449         }
450 
451       out2:
452         free_UCSname(&dname);
453 
454       out:
455         jfs_info("jfs_rmdir: rc:%d", rc);
456         return rc;
457 }
458 
459 /*
460  * NAME:        jfs_unlink(dip, dentry)
461  *
462  * FUNCTION:    remove a link to object <vp> named by <name>
463  *              from parent directory <dvp>
464  *
465  * PARAMETER:   dip     - inode of parent directory
466  *              dentry  - dentry of object to be removed
467  *
468  * RETURN:      errors from subroutines
469  *
470  * note:
471  * temporary file: if one or more processes have the file open
472  * when the last link is removed, the link will be removed before
473  * unlink() returns, but the removal of the file contents will be
474  * postponed until all references to the files are closed.
475  *
476  * JFS does NOT support unlink() on directories.
477  *
478  */
479 static int jfs_unlink(struct inode *dip, struct dentry *dentry)
480 {
481         int rc;
482         tid_t tid;              /* transaction id */
483         struct inode *ip = d_inode(dentry);
484         ino_t ino;
485         struct component_name dname;    /* object name */
486         struct inode *iplist[2];
487         struct tblock *tblk;
488         s64 new_size = 0;
489         int commit_flag;
490 
491         jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry);
492 
493         /* Init inode for quota operations. */
494         rc = dquot_initialize(dip);
495         if (rc)
496                 goto out;
497         rc = dquot_initialize(ip);
498         if (rc)
499                 goto out;
500 
501         if ((rc = get_UCSname(&dname, dentry)))
502                 goto out;
503 
504         IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
505 
506         tid = txBegin(dip->i_sb, 0);
507 
508         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
509         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
510 
511         iplist[0] = dip;
512         iplist[1] = ip;
513 
514         /*
515          * delete the entry of target file from parent directory
516          */
517         ino = ip->i_ino;
518         if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
519                 jfs_err("jfs_unlink: dtDelete returned %d", rc);
520                 if (rc == -EIO)
521                         txAbort(tid, 1);        /* Marks FS Dirty */
522                 txEnd(tid);
523                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
524                 mutex_unlock(&JFS_IP(dip)->commit_mutex);
525                 IWRITE_UNLOCK(ip);
526                 goto out1;
527         }
528 
529         ASSERT(ip->i_nlink);
530 
531         ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip);
532         mark_inode_dirty(dip);
533 
534         /* update target's inode */
535         inode_dec_link_count(ip);
536 
537         /*
538          *      commit zero link count object
539          */
540         if (ip->i_nlink == 0) {
541                 assert(!test_cflag(COMMIT_Nolink, ip));
542                 /* free block resources */
543                 if ((new_size = commitZeroLink(tid, ip)) < 0) {
544                         txAbort(tid, 1);        /* Marks FS Dirty */
545                         txEnd(tid);
546                         mutex_unlock(&JFS_IP(ip)->commit_mutex);
547                         mutex_unlock(&JFS_IP(dip)->commit_mutex);
548                         IWRITE_UNLOCK(ip);
549                         rc = new_size;
550                         goto out1;
551                 }
552                 tblk = tid_to_tblock(tid);
553                 tblk->xflag |= COMMIT_DELETE;
554                 tblk->u.ip = ip;
555         }
556 
557         /*
558          * Incomplete truncate of file data can
559          * result in timing problems unless we synchronously commit the
560          * transaction.
561          */
562         if (new_size)
563                 commit_flag = COMMIT_SYNC;
564         else
565                 commit_flag = 0;
566 
567         /*
568          * If xtTruncate was incomplete, commit synchronously to avoid
569          * timing complications
570          */
571         rc = txCommit(tid, 2, &iplist[0], commit_flag);
572 
573         txEnd(tid);
574 
575         mutex_unlock(&JFS_IP(ip)->commit_mutex);
576         mutex_unlock(&JFS_IP(dip)->commit_mutex);
577 
578         while (new_size && (rc == 0)) {
579                 tid = txBegin(dip->i_sb, 0);
580                 mutex_lock(&JFS_IP(ip)->commit_mutex);
581                 new_size = xtTruncate_pmap(tid, ip, new_size);
582                 if (new_size < 0) {
583                         txAbort(tid, 1);        /* Marks FS Dirty */
584                         rc = new_size;
585                 } else
586                         rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
587                 txEnd(tid);
588                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
589         }
590 
591         if (ip->i_nlink == 0)
592                 set_cflag(COMMIT_Nolink, ip);
593 
594         IWRITE_UNLOCK(ip);
595 
596         /*
597          * Truncating the directory index table is not guaranteed.  It
598          * may need to be done iteratively
599          */
600         if (test_cflag(COMMIT_Stale, dip)) {
601                 if (dip->i_size > 1)
602                         jfs_truncate_nolock(dip, 0);
603 
604                 clear_cflag(COMMIT_Stale, dip);
605         }
606 
607       out1:
608         free_UCSname(&dname);
609       out:
610         jfs_info("jfs_unlink: rc:%d", rc);
611         return rc;
612 }
613 
614 /*
615  * NAME:        commitZeroLink()
616  *
617  * FUNCTION:    for non-directory, called by jfs_remove(),
618  *              truncate a regular file, directory or symbolic
619  *              link to zero length. return 0 if type is not
620  *              one of these.
621  *
622  *              if the file is currently associated with a VM segment
623  *              only permanent disk and inode map resources are freed,
624  *              and neither the inode nor indirect blocks are modified
625  *              so that the resources can be later freed in the work
626  *              map by ctrunc1.
627  *              if there is no VM segment on entry, the resources are
628  *              freed in both work and permanent map.
629  *              (? for temporary file - memory object is cached even
630  *              after no reference:
631  *              reference count > 0 -   )
632  *
633  * PARAMETERS:  cd      - pointer to commit data structure.
634  *                        current inode is the one to truncate.
635  *
636  * RETURN:      Errors from subroutines
637  */
638 static s64 commitZeroLink(tid_t tid, struct inode *ip)
639 {
640         int filetype;
641         struct tblock *tblk;
642 
643         jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
644 
645         filetype = ip->i_mode & S_IFMT;
646         switch (filetype) {
647         case S_IFREG:
648                 break;
649         case S_IFLNK:
650                 /* fast symbolic link */
651                 if (ip->i_size < IDATASIZE) {
652                         ip->i_size = 0;
653                         return 0;
654                 }
655                 break;
656         default:
657                 assert(filetype != S_IFDIR);
658                 return 0;
659         }
660 
661         set_cflag(COMMIT_Freewmap, ip);
662 
663         /* mark transaction of block map update type */
664         tblk = tid_to_tblock(tid);
665         tblk->xflag |= COMMIT_PMAP;
666 
667         /*
668          * free EA
669          */
670         if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
671                 /* acquire maplock on EA to be freed from block map */
672                 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
673 
674         /*
675          * free ACL
676          */
677         if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
678                 /* acquire maplock on EA to be freed from block map */
679                 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
680 
681         /*
682          * free xtree/data (truncate to zero length):
683          * free xtree/data pages from cache if COMMIT_PWMAP,
684          * free xtree/data blocks from persistent block map, and
685          * free xtree/data blocks from working block map if COMMIT_PWMAP;
686          */
687         if (ip->i_size)
688                 return xtTruncate_pmap(tid, ip, 0);
689 
690         return 0;
691 }
692 
693 
694 /*
695  * NAME:        jfs_free_zero_link()
696  *
697  * FUNCTION:    for non-directory, called by iClose(),
698  *              free resources of a file from cache and WORKING map
699  *              for a file previously committed with zero link count
700  *              while associated with a pager object,
701  *
702  * PARAMETER:   ip      - pointer to inode of file.
703  */
704 void jfs_free_zero_link(struct inode *ip)
705 {
706         int type;
707 
708         jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
709 
710         /* return if not reg or symbolic link or if size is
711          * already ok.
712          */
713         type = ip->i_mode & S_IFMT;
714 
715         switch (type) {
716         case S_IFREG:
717                 break;
718         case S_IFLNK:
719                 /* if its contained in inode nothing to do */
720                 if (ip->i_size < IDATASIZE)
721                         return;
722                 break;
723         default:
724                 return;
725         }
726 
727         /*
728          * free EA
729          */
730         if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
731                 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
732                 int xlen = lengthDXD(&JFS_IP(ip)->ea);
733                 struct maplock maplock; /* maplock for COMMIT_WMAP */
734                 struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
735 
736                 /* free EA pages from cache */
737                 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
738 
739                 /* free EA extent from working block map */
740                 maplock.index = 1;
741                 pxdlock = (struct pxd_lock *) & maplock;
742                 pxdlock->flag = mlckFREEPXD;
743                 PXDaddress(&pxdlock->pxd, xaddr);
744                 PXDlength(&pxdlock->pxd, xlen);
745                 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
746         }
747 
748         /*
749          * free ACL
750          */
751         if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
752                 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
753                 int xlen = lengthDXD(&JFS_IP(ip)->acl);
754                 struct maplock maplock; /* maplock for COMMIT_WMAP */
755                 struct pxd_lock *pxdlock;       /* maplock for COMMIT_WMAP */
756 
757                 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
758 
759                 /* free ACL extent from working block map */
760                 maplock.index = 1;
761                 pxdlock = (struct pxd_lock *) & maplock;
762                 pxdlock->flag = mlckFREEPXD;
763                 PXDaddress(&pxdlock->pxd, xaddr);
764                 PXDlength(&pxdlock->pxd, xlen);
765                 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
766         }
767 
768         /*
769          * free xtree/data (truncate to zero length):
770          * free xtree/data pages from cache, and
771          * free xtree/data blocks from working block map;
772          */
773         if (ip->i_size)
774                 xtTruncate(0, ip, 0, COMMIT_WMAP);
775 }
776 
777 /*
778  * NAME:        jfs_link(vp, dvp, name, crp)
779  *
780  * FUNCTION:    create a link to <vp> by the name = <name>
781  *              in the parent directory <dvp>
782  *
783  * PARAMETER:   vp      - target object
784  *              dvp     - parent directory of new link
785  *              name    - name of new link to target object
786  *              crp     - credential
787  *
788  * RETURN:      Errors from subroutines
789  *
790  * note:
791  * JFS does NOT support link() on directories (to prevent circular
792  * path in the directory hierarchy);
793  * EPERM: the target object is a directory, and either the caller
794  * does not have appropriate privileges or the implementation prohibits
795  * using link() on directories [XPG4.2].
796  *
797  * JFS does NOT support links between file systems:
798  * EXDEV: target object and new link are on different file systems and
799  * implementation does not support links between file systems [XPG4.2].
800  */
801 static int jfs_link(struct dentry *old_dentry,
802              struct inode *dir, struct dentry *dentry)
803 {
804         int rc;
805         tid_t tid;
806         struct inode *ip = d_inode(old_dentry);
807         ino_t ino;
808         struct component_name dname;
809         struct btstack btstack;
810         struct inode *iplist[2];
811 
812         jfs_info("jfs_link: %pd %pd", old_dentry, dentry);
813 
814         rc = dquot_initialize(dir);
815         if (rc)
816                 goto out;
817 
818         tid = txBegin(ip->i_sb, 0);
819 
820         mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
821         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
822 
823         /*
824          * scan parent directory for entry/freespace
825          */
826         if ((rc = get_UCSname(&dname, dentry)))
827                 goto out_tx;
828 
829         if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
830                 goto free_dname;
831 
832         /*
833          * create entry for new link in parent directory
834          */
835         ino = ip->i_ino;
836         if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
837                 goto free_dname;
838 
839         /* update object inode */
840         inc_nlink(ip);          /* for new link */
841         ip->i_ctime = current_time(ip);
842         dir->i_ctime = dir->i_mtime = current_time(dir);
843         mark_inode_dirty(dir);
844         ihold(ip);
845 
846         iplist[0] = ip;
847         iplist[1] = dir;
848         rc = txCommit(tid, 2, &iplist[0], 0);
849 
850         if (rc) {
851                 drop_nlink(ip); /* never instantiated */
852                 iput(ip);
853         } else
854                 d_instantiate(dentry, ip);
855 
856       free_dname:
857         free_UCSname(&dname);
858 
859       out_tx:
860         txEnd(tid);
861 
862         mutex_unlock(&JFS_IP(ip)->commit_mutex);
863         mutex_unlock(&JFS_IP(dir)->commit_mutex);
864 
865       out:
866         jfs_info("jfs_link: rc:%d", rc);
867         return rc;
868 }
869 
870 /*
871  * NAME:        jfs_symlink(dip, dentry, name)
872  *
873  * FUNCTION:    creates a symbolic link to <symlink> by name <name>
874  *                      in directory <dip>
875  *
876  * PARAMETER:   dip     - parent directory vnode
877  *              dentry  - dentry of symbolic link
878  *              name    - the path name of the existing object
879  *                        that will be the source of the link
880  *
881  * RETURN:      errors from subroutines
882  *
883  * note:
884  * ENAMETOOLONG: pathname resolution of a symbolic link produced
885  * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
886 */
887 
888 static int jfs_symlink(struct inode *dip, struct dentry *dentry,
889                 const char *name)
890 {
891         int rc;
892         tid_t tid;
893         ino_t ino = 0;
894         struct component_name dname;
895         int ssize;              /* source pathname size */
896         struct btstack btstack;
897         struct inode *ip = d_inode(dentry);
898         s64 xlen = 0;
899         int bmask = 0, xsize;
900         s64 xaddr;
901         struct metapage *mp;
902         struct super_block *sb;
903         struct tblock *tblk;
904 
905         struct inode *iplist[2];
906 
907         jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
908 
909         rc = dquot_initialize(dip);
910         if (rc)
911                 goto out1;
912 
913         ssize = strlen(name) + 1;
914 
915         /*
916          * search parent directory for entry/freespace
917          * (dtSearch() returns parent directory page pinned)
918          */
919 
920         if ((rc = get_UCSname(&dname, dentry)))
921                 goto out1;
922 
923         /*
924          * allocate on-disk/in-memory inode for symbolic link:
925          * (iAlloc() returns new, locked inode)
926          */
927         ip = ialloc(dip, S_IFLNK | 0777);
928         if (IS_ERR(ip)) {
929                 rc = PTR_ERR(ip);
930                 goto out2;
931         }
932 
933         tid = txBegin(dip->i_sb, 0);
934 
935         mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
936         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
937 
938         rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
939         if (rc)
940                 goto out3;
941 
942         tblk = tid_to_tblock(tid);
943         tblk->xflag |= COMMIT_CREATE;
944         tblk->ino = ip->i_ino;
945         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
946 
947         /* fix symlink access permission
948          * (dir_create() ANDs in the u.u_cmask,
949          * but symlinks really need to be 777 access)
950          */
951         ip->i_mode |= 0777;
952 
953         /*
954          * write symbolic link target path name
955          */
956         xtInitRoot(tid, ip);
957 
958         /*
959          * write source path name inline in on-disk inode (fast symbolic link)
960          */
961 
962         if (ssize <= IDATASIZE) {
963                 ip->i_op = &jfs_fast_symlink_inode_operations;
964 
965                 ip->i_link = JFS_IP(ip)->i_inline;
966                 memcpy(ip->i_link, name, ssize);
967                 ip->i_size = ssize - 1;
968 
969                 /*
970                  * if symlink is > 128 bytes, we don't have the space to
971                  * store inline extended attributes
972                  */
973                 if (ssize > sizeof (JFS_IP(ip)->i_inline))
974                         JFS_IP(ip)->mode2 &= ~INLINEEA;
975 
976                 jfs_info("jfs_symlink: fast symlink added  ssize:%d name:%s ",
977                          ssize, name);
978         }
979         /*
980          * write source path name in a single extent
981          */
982         else {
983                 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
984 
985                 ip->i_op = &jfs_symlink_inode_operations;
986                 inode_nohighmem(ip);
987                 ip->i_mapping->a_ops = &jfs_aops;
988 
989                 /*
990                  * even though the data of symlink object (source
991                  * path name) is treated as non-journaled user data,
992                  * it is read/written thru buffer cache for performance.
993                  */
994                 sb = ip->i_sb;
995                 bmask = JFS_SBI(sb)->bsize - 1;
996                 xsize = (ssize + bmask) & ~bmask;
997                 xaddr = 0;
998                 xlen = xsize >> JFS_SBI(sb)->l2bsize;
999                 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
1000                         txAbort(tid, 0);
1001                         goto out3;
1002                 }
1003                 ip->i_size = ssize - 1;
1004                 while (ssize) {
1005                         /* This is kind of silly since PATH_MAX == 4K */
1006                         int copy_size = min(ssize, PSIZE);
1007 
1008                         mp = get_metapage(ip, xaddr, PSIZE, 1);
1009 
1010                         if (mp == NULL) {
1011                                 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1012                                 rc = -EIO;
1013                                 txAbort(tid, 0);
1014                                 goto out3;
1015                         }
1016                         memcpy(mp->data, name, copy_size);
1017                         flush_metapage(mp);
1018                         ssize -= copy_size;
1019                         name += copy_size;
1020                         xaddr += JFS_SBI(sb)->nbperpage;
1021                 }
1022         }
1023 
1024         /*
1025          * create entry for symbolic link in parent directory
1026          */
1027         rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1028         if (rc == 0) {
1029                 ino = ip->i_ino;
1030                 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1031         }
1032         if (rc) {
1033                 if (xlen)
1034                         xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1035                 txAbort(tid, 0);
1036                 /* discard new inode */
1037                 goto out3;
1038         }
1039 
1040         mark_inode_dirty(ip);
1041 
1042         dip->i_ctime = dip->i_mtime = current_time(dip);
1043         mark_inode_dirty(dip);
1044         /*
1045          * commit update of parent directory and link object
1046          */
1047 
1048         iplist[0] = dip;
1049         iplist[1] = ip;
1050         rc = txCommit(tid, 2, &iplist[0], 0);
1051 
1052       out3:
1053         txEnd(tid);
1054         mutex_unlock(&JFS_IP(ip)->commit_mutex);
1055         mutex_unlock(&JFS_IP(dip)->commit_mutex);
1056         if (rc) {
1057                 free_ea_wmap(ip);
1058                 clear_nlink(ip);
1059                 unlock_new_inode(ip);
1060                 iput(ip);
1061         } else {
1062                 unlock_new_inode(ip);
1063                 d_instantiate(dentry, ip);
1064         }
1065 
1066       out2:
1067         free_UCSname(&dname);
1068 
1069       out1:
1070         jfs_info("jfs_symlink: rc:%d", rc);
1071         return rc;
1072 }
1073 
1074 
1075 /*
1076  * NAME:        jfs_rename
1077  *
1078  * FUNCTION:    rename a file or directory
1079  */
1080 static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1081                       struct inode *new_dir, struct dentry *new_dentry,
1082                       unsigned int flags)
1083 {
1084         struct btstack btstack;
1085         ino_t ino;
1086         struct component_name new_dname;
1087         struct inode *new_ip;
1088         struct component_name old_dname;
1089         struct inode *old_ip;
1090         int rc;
1091         tid_t tid;
1092         struct tlock *tlck;
1093         struct dt_lock *dtlck;
1094         struct lv *lv;
1095         int ipcount;
1096         struct inode *iplist[4];
1097         struct tblock *tblk;
1098         s64 new_size = 0;
1099         int commit_flag;
1100 
1101         if (flags & ~RENAME_NOREPLACE)
1102                 return -EINVAL;
1103 
1104         jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry);
1105 
1106         rc = dquot_initialize(old_dir);
1107         if (rc)
1108                 goto out1;
1109         rc = dquot_initialize(new_dir);
1110         if (rc)
1111                 goto out1;
1112 
1113         old_ip = d_inode(old_dentry);
1114         new_ip = d_inode(new_dentry);
1115 
1116         if ((rc = get_UCSname(&old_dname, old_dentry)))
1117                 goto out1;
1118 
1119         if ((rc = get_UCSname(&new_dname, new_dentry)))
1120                 goto out2;
1121 
1122         /*
1123          * Make sure source inode number is what we think it is
1124          */
1125         rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1126         if (rc || (ino != old_ip->i_ino)) {
1127                 rc = -ENOENT;
1128                 goto out3;
1129         }
1130 
1131         /*
1132          * Make sure dest inode number (if any) is what we think it is
1133          */
1134         rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1135         if (!rc) {
1136                 if ((!new_ip) || (ino != new_ip->i_ino)) {
1137                         rc = -ESTALE;
1138                         goto out3;
1139                 }
1140         } else if (rc != -ENOENT)
1141                 goto out3;
1142         else if (new_ip) {
1143                 /* no entry exists, but one was expected */
1144                 rc = -ESTALE;
1145                 goto out3;
1146         }
1147 
1148         if (S_ISDIR(old_ip->i_mode)) {
1149                 if (new_ip) {
1150                         if (!dtEmpty(new_ip)) {
1151                                 rc = -ENOTEMPTY;
1152                                 goto out3;
1153                         }
1154                 }
1155         } else if (new_ip) {
1156                 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1157                 /* Init inode for quota operations. */
1158                 rc = dquot_initialize(new_ip);
1159                 if (rc)
1160                         goto out_unlock;
1161         }
1162 
1163         /*
1164          * The real work starts here
1165          */
1166         tid = txBegin(new_dir->i_sb, 0);
1167 
1168         /*
1169          * How do we know the locking is safe from deadlocks?
1170          * The vfs does the hard part for us.  Any time we are taking nested
1171          * commit_mutexes, the vfs already has i_mutex held on the parent.
1172          * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1173          */
1174         mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1175         mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1176         if (old_dir != new_dir)
1177                 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1178                                   COMMIT_MUTEX_SECOND_PARENT);
1179 
1180         if (new_ip) {
1181                 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1182                                   COMMIT_MUTEX_VICTIM);
1183                 /*
1184                  * Change existing directory entry to new inode number
1185                  */
1186                 ino = new_ip->i_ino;
1187                 rc = dtModify(tid, new_dir, &new_dname, &ino,
1188                               old_ip->i_ino, JFS_RENAME);
1189                 if (rc)
1190                         goto out_tx;
1191                 drop_nlink(new_ip);
1192                 if (S_ISDIR(new_ip->i_mode)) {
1193                         drop_nlink(new_ip);
1194                         if (new_ip->i_nlink) {
1195                                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1196                                 if (old_dir != new_dir)
1197                                         mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1198                                 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1199                                 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1200                                 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1201                                         IWRITE_UNLOCK(new_ip);
1202                                 jfs_error(new_ip->i_sb,
1203                                           "new_ip->i_nlink != 0\n");
1204                                 return -EIO;
1205                         }
1206                         tblk = tid_to_tblock(tid);
1207                         tblk->xflag |= COMMIT_DELETE;
1208                         tblk->u.ip = new_ip;
1209                 } else if (new_ip->i_nlink == 0) {
1210                         assert(!test_cflag(COMMIT_Nolink, new_ip));
1211                         /* free block resources */
1212                         if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1213                                 txAbort(tid, 1);        /* Marks FS Dirty */
1214                                 rc = new_size;
1215                                 goto out_tx;
1216                         }
1217                         tblk = tid_to_tblock(tid);
1218                         tblk->xflag |= COMMIT_DELETE;
1219                         tblk->u.ip = new_ip;
1220                 } else {
1221                         new_ip->i_ctime = current_time(new_ip);
1222                         mark_inode_dirty(new_ip);
1223                 }
1224         } else {
1225                 /*
1226                  * Add new directory entry
1227                  */
1228                 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1229                               JFS_CREATE);
1230                 if (rc) {
1231                         jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d",
1232                                 rc);
1233                         goto out_tx;
1234                 }
1235 
1236                 ino = old_ip->i_ino;
1237                 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1238                 if (rc) {
1239                         if (rc == -EIO)
1240                                 jfs_err("jfs_rename: dtInsert returned -EIO");
1241                         goto out_tx;
1242                 }
1243                 if (S_ISDIR(old_ip->i_mode))
1244                         inc_nlink(new_dir);
1245         }
1246         /*
1247          * Remove old directory entry
1248          */
1249 
1250         ino = old_ip->i_ino;
1251         rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1252         if (rc) {
1253                 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1254                         rc);
1255                 txAbort(tid, 1);        /* Marks Filesystem dirty */
1256                 goto out_tx;
1257         }
1258         if (S_ISDIR(old_ip->i_mode)) {
1259                 drop_nlink(old_dir);
1260                 if (old_dir != new_dir) {
1261                         /*
1262                          * Change inode number of parent for moved directory
1263                          */
1264 
1265                         JFS_IP(old_ip)->i_dtroot.header.idotdot =
1266                                 cpu_to_le32(new_dir->i_ino);
1267 
1268                         /* Linelock header of dtree */
1269                         tlck = txLock(tid, old_ip,
1270                                     (struct metapage *) &JFS_IP(old_ip)->bxflag,
1271                                       tlckDTREE | tlckBTROOT | tlckRELINK);
1272                         dtlck = (struct dt_lock *) & tlck->lock;
1273                         ASSERT(dtlck->index == 0);
1274                         lv = & dtlck->lv[0];
1275                         lv->offset = 0;
1276                         lv->length = 1;
1277                         dtlck->index++;
1278                 }
1279         }
1280 
1281         /*
1282          * Update ctime on changed/moved inodes & mark dirty
1283          */
1284         old_ip->i_ctime = current_time(old_ip);
1285         mark_inode_dirty(old_ip);
1286 
1287         new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir);
1288         mark_inode_dirty(new_dir);
1289 
1290         /* Build list of inodes modified by this transaction */
1291         ipcount = 0;
1292         iplist[ipcount++] = old_ip;
1293         if (new_ip)
1294                 iplist[ipcount++] = new_ip;
1295         iplist[ipcount++] = old_dir;
1296 
1297         if (old_dir != new_dir) {
1298                 iplist[ipcount++] = new_dir;
1299                 old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
1300                 mark_inode_dirty(old_dir);
1301         }
1302 
1303         /*
1304          * Incomplete truncate of file data can
1305          * result in timing problems unless we synchronously commit the
1306          * transaction.
1307          */
1308         if (new_size)
1309                 commit_flag = COMMIT_SYNC;
1310         else
1311                 commit_flag = 0;
1312 
1313         rc = txCommit(tid, ipcount, iplist, commit_flag);
1314 
1315       out_tx:
1316         txEnd(tid);
1317         if (new_ip)
1318                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1319         if (old_dir != new_dir)
1320                 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1321         mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1322         mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1323 
1324         while (new_size && (rc == 0)) {
1325                 tid = txBegin(new_ip->i_sb, 0);
1326                 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1327                 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1328                 if (new_size < 0) {
1329                         txAbort(tid, 1);
1330                         rc = new_size;
1331                 } else
1332                         rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1333                 txEnd(tid);
1334                 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1335         }
1336         if (new_ip && (new_ip->i_nlink == 0))
1337                 set_cflag(COMMIT_Nolink, new_ip);
1338         /*
1339          * Truncating the directory index table is not guaranteed.  It
1340          * may need to be done iteratively
1341          */
1342         if (test_cflag(COMMIT_Stale, old_dir)) {
1343                 if (old_dir->i_size > 1)
1344                         jfs_truncate_nolock(old_dir, 0);
1345 
1346                 clear_cflag(COMMIT_Stale, old_dir);
1347         }
1348       out_unlock:
1349         if (new_ip && !S_ISDIR(new_ip->i_mode))
1350                 IWRITE_UNLOCK(new_ip);
1351       out3:
1352         free_UCSname(&new_dname);
1353       out2:
1354         free_UCSname(&old_dname);
1355       out1:
1356         jfs_info("jfs_rename: returning %d", rc);
1357         return rc;
1358 }
1359 
1360 
1361 /*
1362  * NAME:        jfs_mknod
1363  *
1364  * FUNCTION:    Create a special file (device)
1365  */
1366 static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1367                 umode_t mode, dev_t rdev)
1368 {
1369         struct jfs_inode_info *jfs_ip;
1370         struct btstack btstack;
1371         struct component_name dname;
1372         ino_t ino;
1373         struct inode *ip;
1374         struct inode *iplist[2];
1375         int rc;
1376         tid_t tid;
1377         struct tblock *tblk;
1378 
1379         jfs_info("jfs_mknod: %pd", dentry);
1380 
1381         rc = dquot_initialize(dir);
1382         if (rc)
1383                 goto out;
1384 
1385         if ((rc = get_UCSname(&dname, dentry)))
1386                 goto out;
1387 
1388         ip = ialloc(dir, mode);
1389         if (IS_ERR(ip)) {
1390                 rc = PTR_ERR(ip);
1391                 goto out1;
1392         }
1393         jfs_ip = JFS_IP(ip);
1394 
1395         tid = txBegin(dir->i_sb, 0);
1396 
1397         mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1398         mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1399 
1400         rc = jfs_init_acl(tid, ip, dir);
1401         if (rc)
1402                 goto out3;
1403 
1404         rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1405         if (rc) {
1406                 txAbort(tid, 0);
1407                 goto out3;
1408         }
1409 
1410         if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1411                 txAbort(tid, 0);
1412                 goto out3;
1413         }
1414 
1415         tblk = tid_to_tblock(tid);
1416         tblk->xflag |= COMMIT_CREATE;
1417         tblk->ino = ip->i_ino;
1418         tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1419 
1420         ino = ip->i_ino;
1421         if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1422                 txAbort(tid, 0);
1423                 goto out3;
1424         }
1425 
1426         ip->i_op = &jfs_file_inode_operations;
1427         jfs_ip->dev = new_encode_dev(rdev);
1428         init_special_inode(ip, ip->i_mode, rdev);
1429 
1430         mark_inode_dirty(ip);
1431 
1432         dir->i_ctime = dir->i_mtime = current_time(dir);
1433 
1434         mark_inode_dirty(dir);
1435 
1436         iplist[0] = dir;
1437         iplist[1] = ip;
1438         rc = txCommit(tid, 2, iplist, 0);
1439 
1440       out3:
1441         txEnd(tid);
1442         mutex_unlock(&JFS_IP(ip)->commit_mutex);
1443         mutex_unlock(&JFS_IP(dir)->commit_mutex);
1444         if (rc) {
1445                 free_ea_wmap(ip);
1446                 clear_nlink(ip);
1447                 unlock_new_inode(ip);
1448                 iput(ip);
1449         } else {
1450                 unlock_new_inode(ip);
1451                 d_instantiate(dentry, ip);
1452         }
1453 
1454       out1:
1455         free_UCSname(&dname);
1456 
1457       out:
1458         jfs_info("jfs_mknod: returning %d", rc);
1459         return rc;
1460 }
1461 
1462 static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
1463 {
1464         struct btstack btstack;
1465         ino_t inum;
1466         struct inode *ip;
1467         struct component_name key;
1468         int rc;
1469 
1470         jfs_info("jfs_lookup: name = %pd", dentry);
1471 
1472         if ((rc = get_UCSname(&key, dentry)))
1473                 return ERR_PTR(rc);
1474         rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1475         free_UCSname(&key);
1476         if (rc == -ENOENT) {
1477                 ip = NULL;
1478         } else if (rc) {
1479                 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1480                 ip = ERR_PTR(rc);
1481         } else {
1482                 ip = jfs_iget(dip->i_sb, inum);
1483                 if (IS_ERR(ip))
1484                         jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum);
1485         }
1486 
1487         return d_splice_alias(ip, dentry);
1488 }
1489 
1490 static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1491                 u64 ino, u32 generation)
1492 {
1493         struct inode *inode;
1494 
1495         if (ino == 0)
1496                 return ERR_PTR(-ESTALE);
1497         inode = jfs_iget(sb, ino);
1498         if (IS_ERR(inode))
1499                 return ERR_CAST(inode);
1500 
1501         if (generation && inode->i_generation != generation) {
1502                 iput(inode);
1503                 return ERR_PTR(-ESTALE);
1504         }
1505 
1506         return inode;
1507 }
1508 
1509 struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1510                 int fh_len, int fh_type)
1511 {
1512         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1513                                     jfs_nfs_get_inode);
1514 }
1515 
1516 struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1517                 int fh_len, int fh_type)
1518 {
1519         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1520                                     jfs_nfs_get_inode);
1521 }
1522 
1523 struct dentry *jfs_get_parent(struct dentry *dentry)
1524 {
1525         unsigned long parent_ino;
1526 
1527         parent_ino =
1528                 le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot);
1529 
1530         return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino));
1531 }
1532 
1533 const struct inode_operations jfs_dir_inode_operations = {
1534         .create         = jfs_create,
1535         .lookup         = jfs_lookup,
1536         .link           = jfs_link,
1537         .unlink         = jfs_unlink,
1538         .symlink        = jfs_symlink,
1539         .mkdir          = jfs_mkdir,
1540         .rmdir          = jfs_rmdir,
1541         .mknod          = jfs_mknod,
1542         .rename         = jfs_rename,
1543         .listxattr      = jfs_listxattr,
1544         .setattr        = jfs_setattr,
1545 #ifdef CONFIG_JFS_POSIX_ACL
1546         .get_acl        = jfs_get_acl,
1547         .set_acl        = jfs_set_acl,
1548 #endif
1549 };
1550 
1551 const struct file_operations jfs_dir_operations = {
1552         .read           = generic_read_dir,
1553         .iterate        = jfs_readdir,
1554         .fsync          = jfs_fsync,
1555         .unlocked_ioctl = jfs_ioctl,
1556 #ifdef CONFIG_COMPAT
1557         .compat_ioctl   = jfs_compat_ioctl,
1558 #endif
1559         .llseek         = generic_file_llseek,
1560 };
1561 
1562 static int jfs_ci_hash(const struct dentry *dir, struct qstr *this)
1563 {
1564         unsigned long hash;
1565         int i;
1566 
1567         hash = init_name_hash(dir);
1568         for (i=0; i < this->len; i++)
1569                 hash = partial_name_hash(tolower(this->name[i]), hash);
1570         this->hash = end_name_hash(hash);
1571 
1572         return 0;
1573 }
1574 
1575 static int jfs_ci_compare(const struct dentry *dentry,
1576                 unsigned int len, const char *str, const struct qstr *name)
1577 {
1578         int i, result = 1;
1579 
1580         if (len != name->len)
1581                 goto out;
1582         for (i=0; i < len; i++) {
1583                 if (tolower(str[i]) != tolower(name->name[i]))
1584                         goto out;
1585         }
1586         result = 0;
1587 out:
1588         return result;
1589 }
1590 
1591 static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags)
1592 {
1593         /*
1594          * This is not negative dentry. Always valid.
1595          *
1596          * Note, rename() to existing directory entry will have ->d_inode,
1597          * and will use existing name which isn't specified name by user.
1598          *
1599          * We may be able to drop this positive dentry here. But dropping
1600          * positive dentry isn't good idea. So it's unsupported like
1601          * rename("filename", "FILENAME") for now.
1602          */
1603         if (d_really_is_positive(dentry))
1604                 return 1;
1605 
1606         /*
1607          * This may be nfsd (or something), anyway, we can't see the
1608          * intent of this. So, since this can be for creation, drop it.
1609          */
1610         if (!flags)
1611                 return 0;
1612 
1613         /*
1614          * Drop the negative dentry, in order to make sure to use the
1615          * case sensitive name which is specified by user if this is
1616          * for creation.
1617          */
1618         if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1619                 return 0;
1620         return 1;
1621 }
1622 
1623 const struct dentry_operations jfs_ci_dentry_operations =
1624 {
1625         .d_hash = jfs_ci_hash,
1626         .d_compare = jfs_ci_compare,
1627         .d_revalidate = jfs_ci_revalidate,
1628 };
1629 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp