Root/fs/jfs/namei.c

1/*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/fs.h>
21#include <linux/namei.h>
22#include <linux/ctype.h>
23#include <linux/quotaops.h>
24#include <linux/exportfs.h>
25#include "jfs_incore.h"
26#include "jfs_superblock.h"
27#include "jfs_inode.h"
28#include "jfs_dinode.h"
29#include "jfs_dmap.h"
30#include "jfs_unicode.h"
31#include "jfs_metapage.h"
32#include "jfs_xattr.h"
33#include "jfs_acl.h"
34#include "jfs_debug.h"
35
36/*
37 * forward references
38 */
39const struct dentry_operations jfs_ci_dentry_operations;
40
41static s64 commitZeroLink(tid_t, struct inode *);
42
43/*
44 * NAME: free_ea_wmap(inode)
45 *
46 * FUNCTION: free uncommitted extended attributes from working map
47 *
48 */
49static inline void free_ea_wmap(struct inode *inode)
50{
51    dxd_t *ea = &JFS_IP(inode)->ea;
52
53    if (ea->flag & DXD_EXTENT) {
54        /* free EA pages from cache */
55        invalidate_dxd_metapages(inode, *ea);
56        dbFree(inode, addressDXD(ea), lengthDXD(ea));
57    }
58    ea->flag = 0;
59}
60
61/*
62 * NAME: jfs_create(dip, dentry, mode)
63 *
64 * FUNCTION: create a regular file in the parent directory <dip>
65 * with name = <from dentry> and mode = <mode>
66 *
67 * PARAMETER: dip - parent directory vnode
68 * dentry - dentry of new file
69 * mode - create mode (rwxrwxrwx).
70 * nd- nd struct
71 *
72 * RETURN: Errors from subroutines
73 *
74 */
75static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
76        struct nameidata *nd)
77{
78    int rc = 0;
79    tid_t tid; /* transaction id */
80    struct inode *ip = NULL; /* child directory inode */
81    ino_t ino;
82    struct component_name dname; /* child directory name */
83    struct btstack btstack;
84    struct inode *iplist[2];
85    struct tblock *tblk;
86
87    jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
88
89    dquot_initialize(dip);
90
91    /*
92     * search parent directory for entry/freespace
93     * (dtSearch() returns parent directory page pinned)
94     */
95    if ((rc = get_UCSname(&dname, dentry)))
96        goto out1;
97
98    /*
99     * Either iAlloc() or txBegin() may block. Deadlock can occur if we
100     * block there while holding dtree page, so we allocate the inode &
101     * begin the transaction before we search the directory.
102     */
103    ip = ialloc(dip, mode);
104    if (IS_ERR(ip)) {
105        rc = PTR_ERR(ip);
106        goto out2;
107    }
108
109    tid = txBegin(dip->i_sb, 0);
110
111    mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
112    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
113
114    rc = jfs_init_acl(tid, ip, dip);
115    if (rc)
116        goto out3;
117
118    rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
119    if (rc) {
120        txAbort(tid, 0);
121        goto out3;
122    }
123
124    if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
125        jfs_err("jfs_create: dtSearch returned %d", rc);
126        txAbort(tid, 0);
127        goto out3;
128    }
129
130    tblk = tid_to_tblock(tid);
131    tblk->xflag |= COMMIT_CREATE;
132    tblk->ino = ip->i_ino;
133    tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
134
135    iplist[0] = dip;
136    iplist[1] = ip;
137
138    /*
139     * initialize the child XAD tree root in-line in inode
140     */
141    xtInitRoot(tid, ip);
142
143    /*
144     * create entry in parent directory for child directory
145     * (dtInsert() releases parent directory page)
146     */
147    ino = ip->i_ino;
148    if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
149        if (rc == -EIO) {
150            jfs_err("jfs_create: dtInsert returned -EIO");
151            txAbort(tid, 1); /* Marks Filesystem dirty */
152        } else
153            txAbort(tid, 0); /* Filesystem full */
154        goto out3;
155    }
156
157    ip->i_op = &jfs_file_inode_operations;
158    ip->i_fop = &jfs_file_operations;
159    ip->i_mapping->a_ops = &jfs_aops;
160
161    mark_inode_dirty(ip);
162
163    dip->i_ctime = dip->i_mtime = CURRENT_TIME;
164
165    mark_inode_dirty(dip);
166
167    rc = txCommit(tid, 2, &iplist[0], 0);
168
169      out3:
170    txEnd(tid);
171    mutex_unlock(&JFS_IP(ip)->commit_mutex);
172    mutex_unlock(&JFS_IP(dip)->commit_mutex);
173    if (rc) {
174        free_ea_wmap(ip);
175        ip->i_nlink = 0;
176        unlock_new_inode(ip);
177        iput(ip);
178    } else {
179        d_instantiate(dentry, ip);
180        unlock_new_inode(ip);
181    }
182
183      out2:
184    free_UCSname(&dname);
185
186      out1:
187
188    jfs_info("jfs_create: rc:%d", rc);
189    return rc;
190}
191
192
193/*
194 * NAME: jfs_mkdir(dip, dentry, mode)
195 *
196 * FUNCTION: create a child directory in the parent directory <dip>
197 * with name = <from dentry> and mode = <mode>
198 *
199 * PARAMETER: dip - parent directory vnode
200 * dentry - dentry of child directory
201 * mode - create mode (rwxrwxrwx).
202 *
203 * RETURN: Errors from subroutines
204 *
205 * note:
206 * EACCESS: user needs search+write permission on the parent directory
207 */
208static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
209{
210    int rc = 0;
211    tid_t tid; /* transaction id */
212    struct inode *ip = NULL; /* child directory inode */
213    ino_t ino;
214    struct component_name dname; /* child directory name */
215    struct btstack btstack;
216    struct inode *iplist[2];
217    struct tblock *tblk;
218
219    jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
220
221    dquot_initialize(dip);
222
223    /* link count overflow on parent directory ? */
224    if (dip->i_nlink == JFS_LINK_MAX) {
225        rc = -EMLINK;
226        goto out1;
227    }
228
229    /*
230     * search parent directory for entry/freespace
231     * (dtSearch() returns parent directory page pinned)
232     */
233    if ((rc = get_UCSname(&dname, dentry)))
234        goto out1;
235
236    /*
237     * Either iAlloc() or txBegin() may block. Deadlock can occur if we
238     * block there while holding dtree page, so we allocate the inode &
239     * begin the transaction before we search the directory.
240     */
241    ip = ialloc(dip, S_IFDIR | mode);
242    if (IS_ERR(ip)) {
243        rc = PTR_ERR(ip);
244        goto out2;
245    }
246
247    tid = txBegin(dip->i_sb, 0);
248
249    mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
250    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
251
252    rc = jfs_init_acl(tid, ip, dip);
253    if (rc)
254        goto out3;
255
256    rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
257    if (rc) {
258        txAbort(tid, 0);
259        goto out3;
260    }
261
262    if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
263        jfs_err("jfs_mkdir: dtSearch returned %d", rc);
264        txAbort(tid, 0);
265        goto out3;
266    }
267
268    tblk = tid_to_tblock(tid);
269    tblk->xflag |= COMMIT_CREATE;
270    tblk->ino = ip->i_ino;
271    tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
272
273    iplist[0] = dip;
274    iplist[1] = ip;
275
276    /*
277     * initialize the child directory in-line in inode
278     */
279    dtInitRoot(tid, ip, dip->i_ino);
280
281    /*
282     * create entry in parent directory for child directory
283     * (dtInsert() releases parent directory page)
284     */
285    ino = ip->i_ino;
286    if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
287        if (rc == -EIO) {
288            jfs_err("jfs_mkdir: dtInsert returned -EIO");
289            txAbort(tid, 1); /* Marks Filesystem dirty */
290        } else
291            txAbort(tid, 0); /* Filesystem full */
292        goto out3;
293    }
294
295    ip->i_nlink = 2; /* for '.' */
296    ip->i_op = &jfs_dir_inode_operations;
297    ip->i_fop = &jfs_dir_operations;
298
299    mark_inode_dirty(ip);
300
301    /* update parent directory inode */
302    inc_nlink(dip); /* for '..' from child directory */
303    dip->i_ctime = dip->i_mtime = CURRENT_TIME;
304    mark_inode_dirty(dip);
305
306    rc = txCommit(tid, 2, &iplist[0], 0);
307
308      out3:
309    txEnd(tid);
310    mutex_unlock(&JFS_IP(ip)->commit_mutex);
311    mutex_unlock(&JFS_IP(dip)->commit_mutex);
312    if (rc) {
313        free_ea_wmap(ip);
314        ip->i_nlink = 0;
315        unlock_new_inode(ip);
316        iput(ip);
317    } else {
318        d_instantiate(dentry, ip);
319        unlock_new_inode(ip);
320    }
321
322      out2:
323    free_UCSname(&dname);
324
325
326      out1:
327
328    jfs_info("jfs_mkdir: rc:%d", rc);
329    return rc;
330}
331
332/*
333 * NAME: jfs_rmdir(dip, dentry)
334 *
335 * FUNCTION: remove a link to child directory
336 *
337 * PARAMETER: dip - parent inode
338 * dentry - child directory dentry
339 *
340 * RETURN: -EINVAL - if name is . or ..
341 * -EINVAL - if . or .. exist but are invalid.
342 * errors from subroutines
343 *
344 * note:
345 * if other threads have the directory open when the last link
346 * is removed, the "." and ".." entries, if present, are removed before
347 * rmdir() returns and no new entries may be created in the directory,
348 * but the directory is not removed until the last reference to
349 * the directory is released (cf.unlink() of regular file).
350 */
351static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
352{
353    int rc;
354    tid_t tid; /* transaction id */
355    struct inode *ip = dentry->d_inode;
356    ino_t ino;
357    struct component_name dname;
358    struct inode *iplist[2];
359    struct tblock *tblk;
360
361    jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
362
363    /* Init inode for quota operations. */
364    dquot_initialize(dip);
365    dquot_initialize(ip);
366
367    /* directory must be empty to be removed */
368    if (!dtEmpty(ip)) {
369        rc = -ENOTEMPTY;
370        goto out;
371    }
372
373    if ((rc = get_UCSname(&dname, dentry))) {
374        goto out;
375    }
376
377    tid = txBegin(dip->i_sb, 0);
378
379    mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
380    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
381
382    iplist[0] = dip;
383    iplist[1] = ip;
384
385    tblk = tid_to_tblock(tid);
386    tblk->xflag |= COMMIT_DELETE;
387    tblk->u.ip = ip;
388
389    /*
390     * delete the entry of target directory from parent directory
391     */
392    ino = ip->i_ino;
393    if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
394        jfs_err("jfs_rmdir: dtDelete returned %d", rc);
395        if (rc == -EIO)
396            txAbort(tid, 1);
397        txEnd(tid);
398        mutex_unlock(&JFS_IP(ip)->commit_mutex);
399        mutex_unlock(&JFS_IP(dip)->commit_mutex);
400
401        goto out2;
402    }
403
404    /* update parent directory's link count corresponding
405     * to ".." entry of the target directory deleted
406     */
407    dip->i_ctime = dip->i_mtime = CURRENT_TIME;
408    inode_dec_link_count(dip);
409
410    /*
411     * OS/2 could have created EA and/or ACL
412     */
413    /* free EA from both persistent and working map */
414    if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
415        /* free EA pages */
416        txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
417    }
418    JFS_IP(ip)->ea.flag = 0;
419
420    /* free ACL from both persistent and working map */
421    if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
422        /* free ACL pages */
423        txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
424    }
425    JFS_IP(ip)->acl.flag = 0;
426
427    /* mark the target directory as deleted */
428    clear_nlink(ip);
429    mark_inode_dirty(ip);
430
431    rc = txCommit(tid, 2, &iplist[0], 0);
432
433    txEnd(tid);
434
435    mutex_unlock(&JFS_IP(ip)->commit_mutex);
436    mutex_unlock(&JFS_IP(dip)->commit_mutex);
437
438    /*
439     * Truncating the directory index table is not guaranteed. It
440     * may need to be done iteratively
441     */
442    if (test_cflag(COMMIT_Stale, dip)) {
443        if (dip->i_size > 1)
444            jfs_truncate_nolock(dip, 0);
445
446        clear_cflag(COMMIT_Stale, dip);
447    }
448
449      out2:
450    free_UCSname(&dname);
451
452      out:
453    jfs_info("jfs_rmdir: rc:%d", rc);
454    return rc;
455}
456
457/*
458 * NAME: jfs_unlink(dip, dentry)
459 *
460 * FUNCTION: remove a link to object <vp> named by <name>
461 * from parent directory <dvp>
462 *
463 * PARAMETER: dip - inode of parent directory
464 * dentry - dentry of object to be removed
465 *
466 * RETURN: errors from subroutines
467 *
468 * note:
469 * temporary file: if one or more processes have the file open
470 * when the last link is removed, the link will be removed before
471 * unlink() returns, but the removal of the file contents will be
472 * postponed until all references to the files are closed.
473 *
474 * JFS does NOT support unlink() on directories.
475 *
476 */
477static int jfs_unlink(struct inode *dip, struct dentry *dentry)
478{
479    int rc;
480    tid_t tid; /* transaction id */
481    struct inode *ip = dentry->d_inode;
482    ino_t ino;
483    struct component_name dname; /* object name */
484    struct inode *iplist[2];
485    struct tblock *tblk;
486    s64 new_size = 0;
487    int commit_flag;
488
489    jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
490
491    /* Init inode for quota operations. */
492    dquot_initialize(dip);
493    dquot_initialize(ip);
494
495    if ((rc = get_UCSname(&dname, dentry)))
496        goto out;
497
498    IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
499
500    tid = txBegin(dip->i_sb, 0);
501
502    mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
503    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
504
505    iplist[0] = dip;
506    iplist[1] = ip;
507
508    /*
509     * delete the entry of target file from parent directory
510     */
511    ino = ip->i_ino;
512    if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
513        jfs_err("jfs_unlink: dtDelete returned %d", rc);
514        if (rc == -EIO)
515            txAbort(tid, 1); /* Marks FS Dirty */
516        txEnd(tid);
517        mutex_unlock(&JFS_IP(ip)->commit_mutex);
518        mutex_unlock(&JFS_IP(dip)->commit_mutex);
519        IWRITE_UNLOCK(ip);
520        goto out1;
521    }
522
523    ASSERT(ip->i_nlink);
524
525    ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
526    mark_inode_dirty(dip);
527
528    /* update target's inode */
529    inode_dec_link_count(ip);
530
531    /*
532     * commit zero link count object
533     */
534    if (ip->i_nlink == 0) {
535        assert(!test_cflag(COMMIT_Nolink, ip));
536        /* free block resources */
537        if ((new_size = commitZeroLink(tid, ip)) < 0) {
538            txAbort(tid, 1); /* Marks FS Dirty */
539            txEnd(tid);
540            mutex_unlock(&JFS_IP(ip)->commit_mutex);
541            mutex_unlock(&JFS_IP(dip)->commit_mutex);
542            IWRITE_UNLOCK(ip);
543            rc = new_size;
544            goto out1;
545        }
546        tblk = tid_to_tblock(tid);
547        tblk->xflag |= COMMIT_DELETE;
548        tblk->u.ip = ip;
549    }
550
551    /*
552     * Incomplete truncate of file data can
553     * result in timing problems unless we synchronously commit the
554     * transaction.
555     */
556    if (new_size)
557        commit_flag = COMMIT_SYNC;
558    else
559        commit_flag = 0;
560
561    /*
562     * If xtTruncate was incomplete, commit synchronously to avoid
563     * timing complications
564     */
565    rc = txCommit(tid, 2, &iplist[0], commit_flag);
566
567    txEnd(tid);
568
569    mutex_unlock(&JFS_IP(ip)->commit_mutex);
570    mutex_unlock(&JFS_IP(dip)->commit_mutex);
571
572    while (new_size && (rc == 0)) {
573        tid = txBegin(dip->i_sb, 0);
574        mutex_lock(&JFS_IP(ip)->commit_mutex);
575        new_size = xtTruncate_pmap(tid, ip, new_size);
576        if (new_size < 0) {
577            txAbort(tid, 1); /* Marks FS Dirty */
578            rc = new_size;
579        } else
580            rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
581        txEnd(tid);
582        mutex_unlock(&JFS_IP(ip)->commit_mutex);
583    }
584
585    if (ip->i_nlink == 0)
586        set_cflag(COMMIT_Nolink, ip);
587
588    IWRITE_UNLOCK(ip);
589
590    /*
591     * Truncating the directory index table is not guaranteed. It
592     * may need to be done iteratively
593     */
594    if (test_cflag(COMMIT_Stale, dip)) {
595        if (dip->i_size > 1)
596            jfs_truncate_nolock(dip, 0);
597
598        clear_cflag(COMMIT_Stale, dip);
599    }
600
601      out1:
602    free_UCSname(&dname);
603      out:
604    jfs_info("jfs_unlink: rc:%d", rc);
605    return rc;
606}
607
608/*
609 * NAME: commitZeroLink()
610 *
611 * FUNCTION: for non-directory, called by jfs_remove(),
612 * truncate a regular file, directory or symbolic
613 * link to zero length. return 0 if type is not
614 * one of these.
615 *
616 * if the file is currently associated with a VM segment
617 * only permanent disk and inode map resources are freed,
618 * and neither the inode nor indirect blocks are modified
619 * so that the resources can be later freed in the work
620 * map by ctrunc1.
621 * if there is no VM segment on entry, the resources are
622 * freed in both work and permanent map.
623 * (? for temporary file - memory object is cached even
624 * after no reference:
625 * reference count > 0 - )
626 *
627 * PARAMETERS: cd - pointer to commit data structure.
628 * current inode is the one to truncate.
629 *
630 * RETURN: Errors from subroutines
631 */
632static s64 commitZeroLink(tid_t tid, struct inode *ip)
633{
634    int filetype;
635    struct tblock *tblk;
636
637    jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
638
639    filetype = ip->i_mode & S_IFMT;
640    switch (filetype) {
641    case S_IFREG:
642        break;
643    case S_IFLNK:
644        /* fast symbolic link */
645        if (ip->i_size < IDATASIZE) {
646            ip->i_size = 0;
647            return 0;
648        }
649        break;
650    default:
651        assert(filetype != S_IFDIR);
652        return 0;
653    }
654
655    set_cflag(COMMIT_Freewmap, ip);
656
657    /* mark transaction of block map update type */
658    tblk = tid_to_tblock(tid);
659    tblk->xflag |= COMMIT_PMAP;
660
661    /*
662     * free EA
663     */
664    if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
665        /* acquire maplock on EA to be freed from block map */
666        txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
667
668    /*
669     * free ACL
670     */
671    if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
672        /* acquire maplock on EA to be freed from block map */
673        txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
674
675    /*
676     * free xtree/data (truncate to zero length):
677     * free xtree/data pages from cache if COMMIT_PWMAP,
678     * free xtree/data blocks from persistent block map, and
679     * free xtree/data blocks from working block map if COMMIT_PWMAP;
680     */
681    if (ip->i_size)
682        return xtTruncate_pmap(tid, ip, 0);
683
684    return 0;
685}
686
687
688/*
689 * NAME: jfs_free_zero_link()
690 *
691 * FUNCTION: for non-directory, called by iClose(),
692 * free resources of a file from cache and WORKING map
693 * for a file previously committed with zero link count
694 * while associated with a pager object,
695 *
696 * PARAMETER: ip - pointer to inode of file.
697 */
698void jfs_free_zero_link(struct inode *ip)
699{
700    int type;
701
702    jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
703
704    /* return if not reg or symbolic link or if size is
705     * already ok.
706     */
707    type = ip->i_mode & S_IFMT;
708
709    switch (type) {
710    case S_IFREG:
711        break;
712    case S_IFLNK:
713        /* if its contained in inode nothing to do */
714        if (ip->i_size < IDATASIZE)
715            return;
716        break;
717    default:
718        return;
719    }
720
721    /*
722     * free EA
723     */
724    if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
725        s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
726        int xlen = lengthDXD(&JFS_IP(ip)->ea);
727        struct maplock maplock; /* maplock for COMMIT_WMAP */
728        struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
729
730        /* free EA pages from cache */
731        invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
732
733        /* free EA extent from working block map */
734        maplock.index = 1;
735        pxdlock = (struct pxd_lock *) & maplock;
736        pxdlock->flag = mlckFREEPXD;
737        PXDaddress(&pxdlock->pxd, xaddr);
738        PXDlength(&pxdlock->pxd, xlen);
739        txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
740    }
741
742    /*
743     * free ACL
744     */
745    if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
746        s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
747        int xlen = lengthDXD(&JFS_IP(ip)->acl);
748        struct maplock maplock; /* maplock for COMMIT_WMAP */
749        struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
750
751        invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
752
753        /* free ACL extent from working block map */
754        maplock.index = 1;
755        pxdlock = (struct pxd_lock *) & maplock;
756        pxdlock->flag = mlckFREEPXD;
757        PXDaddress(&pxdlock->pxd, xaddr);
758        PXDlength(&pxdlock->pxd, xlen);
759        txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
760    }
761
762    /*
763     * free xtree/data (truncate to zero length):
764     * free xtree/data pages from cache, and
765     * free xtree/data blocks from working block map;
766     */
767    if (ip->i_size)
768        xtTruncate(0, ip, 0, COMMIT_WMAP);
769}
770
771/*
772 * NAME: jfs_link(vp, dvp, name, crp)
773 *
774 * FUNCTION: create a link to <vp> by the name = <name>
775 * in the parent directory <dvp>
776 *
777 * PARAMETER: vp - target object
778 * dvp - parent directory of new link
779 * name - name of new link to target object
780 * crp - credential
781 *
782 * RETURN: Errors from subroutines
783 *
784 * note:
785 * JFS does NOT support link() on directories (to prevent circular
786 * path in the directory hierarchy);
787 * EPERM: the target object is a directory, and either the caller
788 * does not have appropriate privileges or the implementation prohibits
789 * using link() on directories [XPG4.2].
790 *
791 * JFS does NOT support links between file systems:
792 * EXDEV: target object and new link are on different file systems and
793 * implementation does not support links between file systems [XPG4.2].
794 */
795static int jfs_link(struct dentry *old_dentry,
796         struct inode *dir, struct dentry *dentry)
797{
798    int rc;
799    tid_t tid;
800    struct inode *ip = old_dentry->d_inode;
801    ino_t ino;
802    struct component_name dname;
803    struct btstack btstack;
804    struct inode *iplist[2];
805
806    jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
807         dentry->d_name.name);
808
809    if (ip->i_nlink == JFS_LINK_MAX)
810        return -EMLINK;
811
812    dquot_initialize(dir);
813
814    tid = txBegin(ip->i_sb, 0);
815
816    mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
817    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
818
819    /*
820     * scan parent directory for entry/freespace
821     */
822    if ((rc = get_UCSname(&dname, dentry)))
823        goto out;
824
825    if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
826        goto free_dname;
827
828    /*
829     * create entry for new link in parent directory
830     */
831    ino = ip->i_ino;
832    if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
833        goto free_dname;
834
835    /* update object inode */
836    inc_nlink(ip); /* for new link */
837    ip->i_ctime = CURRENT_TIME;
838    dir->i_ctime = dir->i_mtime = CURRENT_TIME;
839    mark_inode_dirty(dir);
840    ihold(ip);
841
842    iplist[0] = ip;
843    iplist[1] = dir;
844    rc = txCommit(tid, 2, &iplist[0], 0);
845
846    if (rc) {
847        ip->i_nlink--; /* never instantiated */
848        iput(ip);
849    } else
850        d_instantiate(dentry, ip);
851
852      free_dname:
853    free_UCSname(&dname);
854
855      out:
856    txEnd(tid);
857
858    mutex_unlock(&JFS_IP(ip)->commit_mutex);
859    mutex_unlock(&JFS_IP(dir)->commit_mutex);
860
861    jfs_info("jfs_link: rc:%d", rc);
862    return rc;
863}
864
865/*
866 * NAME: jfs_symlink(dip, dentry, name)
867 *
868 * FUNCTION: creates a symbolic link to <symlink> by name <name>
869 * in directory <dip>
870 *
871 * PARAMETER: dip - parent directory vnode
872 * dentry - dentry of symbolic link
873 * name - the path name of the existing object
874 * that will be the source of the link
875 *
876 * RETURN: errors from subroutines
877 *
878 * note:
879 * ENAMETOOLONG: pathname resolution of a symbolic link produced
880 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
881*/
882
883static int jfs_symlink(struct inode *dip, struct dentry *dentry,
884        const char *name)
885{
886    int rc;
887    tid_t tid;
888    ino_t ino = 0;
889    struct component_name dname;
890    int ssize; /* source pathname size */
891    struct btstack btstack;
892    struct inode *ip = dentry->d_inode;
893    unchar *i_fastsymlink;
894    s64 xlen = 0;
895    int bmask = 0, xsize;
896    s64 extent = 0, xaddr;
897    struct metapage *mp;
898    struct super_block *sb;
899    struct tblock *tblk;
900
901    struct inode *iplist[2];
902
903    jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
904
905    dquot_initialize(dip);
906
907    ssize = strlen(name) + 1;
908
909    /*
910     * search parent directory for entry/freespace
911     * (dtSearch() returns parent directory page pinned)
912     */
913
914    if ((rc = get_UCSname(&dname, dentry)))
915        goto out1;
916
917    /*
918     * allocate on-disk/in-memory inode for symbolic link:
919     * (iAlloc() returns new, locked inode)
920     */
921    ip = ialloc(dip, S_IFLNK | 0777);
922    if (IS_ERR(ip)) {
923        rc = PTR_ERR(ip);
924        goto out2;
925    }
926
927    tid = txBegin(dip->i_sb, 0);
928
929    mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
930    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
931
932    rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
933    if (rc)
934        goto out3;
935
936    tblk = tid_to_tblock(tid);
937    tblk->xflag |= COMMIT_CREATE;
938    tblk->ino = ip->i_ino;
939    tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
940
941    /* fix symlink access permission
942     * (dir_create() ANDs in the u.u_cmask,
943     * but symlinks really need to be 777 access)
944     */
945    ip->i_mode |= 0777;
946
947    /*
948     * write symbolic link target path name
949     */
950    xtInitRoot(tid, ip);
951
952    /*
953     * write source path name inline in on-disk inode (fast symbolic link)
954     */
955
956    if (ssize <= IDATASIZE) {
957        ip->i_op = &jfs_fast_symlink_inode_operations;
958
959        i_fastsymlink = JFS_IP(ip)->i_inline;
960        memcpy(i_fastsymlink, name, ssize);
961        ip->i_size = ssize - 1;
962
963        /*
964         * if symlink is > 128 bytes, we don't have the space to
965         * store inline extended attributes
966         */
967        if (ssize > sizeof (JFS_IP(ip)->i_inline))
968            JFS_IP(ip)->mode2 &= ~INLINEEA;
969
970        jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
971             ssize, name);
972    }
973    /*
974     * write source path name in a single extent
975     */
976    else {
977        jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
978
979        ip->i_op = &jfs_symlink_inode_operations;
980        ip->i_mapping->a_ops = &jfs_aops;
981
982        /*
983         * even though the data of symlink object (source
984         * path name) is treated as non-journaled user data,
985         * it is read/written thru buffer cache for performance.
986         */
987        sb = ip->i_sb;
988        bmask = JFS_SBI(sb)->bsize - 1;
989        xsize = (ssize + bmask) & ~bmask;
990        xaddr = 0;
991        xlen = xsize >> JFS_SBI(sb)->l2bsize;
992        if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
993            txAbort(tid, 0);
994            goto out3;
995        }
996        extent = xaddr;
997        ip->i_size = ssize - 1;
998        while (ssize) {
999            /* This is kind of silly since PATH_MAX == 4K */
1000            int copy_size = min(ssize, PSIZE);
1001
1002            mp = get_metapage(ip, xaddr, PSIZE, 1);
1003
1004            if (mp == NULL) {
1005                xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1006                rc = -EIO;
1007                txAbort(tid, 0);
1008                goto out3;
1009            }
1010            memcpy(mp->data, name, copy_size);
1011            flush_metapage(mp);
1012            ssize -= copy_size;
1013            name += copy_size;
1014            xaddr += JFS_SBI(sb)->nbperpage;
1015        }
1016    }
1017
1018    /*
1019     * create entry for symbolic link in parent directory
1020     */
1021    rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1022    if (rc == 0) {
1023        ino = ip->i_ino;
1024        rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1025    }
1026    if (rc) {
1027        if (xlen)
1028            xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1029        txAbort(tid, 0);
1030        /* discard new inode */
1031        goto out3;
1032    }
1033
1034    mark_inode_dirty(ip);
1035
1036    dip->i_ctime = dip->i_mtime = CURRENT_TIME;
1037    mark_inode_dirty(dip);
1038    /*
1039     * commit update of parent directory and link object
1040     */
1041
1042    iplist[0] = dip;
1043    iplist[1] = ip;
1044    rc = txCommit(tid, 2, &iplist[0], 0);
1045
1046      out3:
1047    txEnd(tid);
1048    mutex_unlock(&JFS_IP(ip)->commit_mutex);
1049    mutex_unlock(&JFS_IP(dip)->commit_mutex);
1050    if (rc) {
1051        free_ea_wmap(ip);
1052        ip->i_nlink = 0;
1053        unlock_new_inode(ip);
1054        iput(ip);
1055    } else {
1056        d_instantiate(dentry, ip);
1057        unlock_new_inode(ip);
1058    }
1059
1060      out2:
1061    free_UCSname(&dname);
1062
1063      out1:
1064    jfs_info("jfs_symlink: rc:%d", rc);
1065    return rc;
1066}
1067
1068
1069/*
1070 * NAME: jfs_rename
1071 *
1072 * FUNCTION: rename a file or directory
1073 */
1074static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1075           struct inode *new_dir, struct dentry *new_dentry)
1076{
1077    struct btstack btstack;
1078    ino_t ino;
1079    struct component_name new_dname;
1080    struct inode *new_ip;
1081    struct component_name old_dname;
1082    struct inode *old_ip;
1083    int rc;
1084    tid_t tid;
1085    struct tlock *tlck;
1086    struct dt_lock *dtlck;
1087    struct lv *lv;
1088    int ipcount;
1089    struct inode *iplist[4];
1090    struct tblock *tblk;
1091    s64 new_size = 0;
1092    int commit_flag;
1093
1094
1095    jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1096         new_dentry->d_name.name);
1097
1098    dquot_initialize(old_dir);
1099    dquot_initialize(new_dir);
1100
1101    old_ip = old_dentry->d_inode;
1102    new_ip = new_dentry->d_inode;
1103
1104    if ((rc = get_UCSname(&old_dname, old_dentry)))
1105        goto out1;
1106
1107    if ((rc = get_UCSname(&new_dname, new_dentry)))
1108        goto out2;
1109
1110    /*
1111     * Make sure source inode number is what we think it is
1112     */
1113    rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1114    if (rc || (ino != old_ip->i_ino)) {
1115        rc = -ENOENT;
1116        goto out3;
1117    }
1118
1119    /*
1120     * Make sure dest inode number (if any) is what we think it is
1121     */
1122    rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
1123    if (!rc) {
1124        if ((!new_ip) || (ino != new_ip->i_ino)) {
1125            rc = -ESTALE;
1126            goto out3;
1127        }
1128    } else if (rc != -ENOENT)
1129        goto out3;
1130    else if (new_ip) {
1131        /* no entry exists, but one was expected */
1132        rc = -ESTALE;
1133        goto out3;
1134    }
1135
1136    if (S_ISDIR(old_ip->i_mode)) {
1137        if (new_ip) {
1138            if (!dtEmpty(new_ip)) {
1139                rc = -ENOTEMPTY;
1140                goto out3;
1141            }
1142        } else if ((new_dir != old_dir) &&
1143               (new_dir->i_nlink == JFS_LINK_MAX)) {
1144            rc = -EMLINK;
1145            goto out3;
1146        }
1147    } else if (new_ip) {
1148        IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
1149        /* Init inode for quota operations. */
1150        dquot_initialize(new_ip);
1151    }
1152
1153    /*
1154     * The real work starts here
1155     */
1156    tid = txBegin(new_dir->i_sb, 0);
1157
1158    /*
1159     * How do we know the locking is safe from deadlocks?
1160     * The vfs does the hard part for us. Any time we are taking nested
1161     * commit_mutexes, the vfs already has i_mutex held on the parent.
1162     * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1163     */
1164    mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1165    mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1166    if (old_dir != new_dir)
1167        mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1168                  COMMIT_MUTEX_SECOND_PARENT);
1169
1170    if (new_ip) {
1171        mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1172                  COMMIT_MUTEX_VICTIM);
1173        /*
1174         * Change existing directory entry to new inode number
1175         */
1176        ino = new_ip->i_ino;
1177        rc = dtModify(tid, new_dir, &new_dname, &ino,
1178                  old_ip->i_ino, JFS_RENAME);
1179        if (rc)
1180            goto out4;
1181        drop_nlink(new_ip);
1182        if (S_ISDIR(new_ip->i_mode)) {
1183            drop_nlink(new_ip);
1184            if (new_ip->i_nlink) {
1185                mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1186                if (old_dir != new_dir)
1187                    mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1188                mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1189                mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1190                if (!S_ISDIR(old_ip->i_mode) && new_ip)
1191                    IWRITE_UNLOCK(new_ip);
1192                jfs_error(new_ip->i_sb,
1193                      "jfs_rename: new_ip->i_nlink != 0");
1194                return -EIO;
1195            }
1196            tblk = tid_to_tblock(tid);
1197            tblk->xflag |= COMMIT_DELETE;
1198            tblk->u.ip = new_ip;
1199        } else if (new_ip->i_nlink == 0) {
1200            assert(!test_cflag(COMMIT_Nolink, new_ip));
1201            /* free block resources */
1202            if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1203                txAbort(tid, 1); /* Marks FS Dirty */
1204                rc = new_size;
1205                goto out4;
1206            }
1207            tblk = tid_to_tblock(tid);
1208            tblk->xflag |= COMMIT_DELETE;
1209            tblk->u.ip = new_ip;
1210        } else {
1211            new_ip->i_ctime = CURRENT_TIME;
1212            mark_inode_dirty(new_ip);
1213        }
1214    } else {
1215        /*
1216         * Add new directory entry
1217         */
1218        rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1219                  JFS_CREATE);
1220        if (rc) {
1221            jfs_err("jfs_rename didn't expect dtSearch to fail "
1222                "w/rc = %d", rc);
1223            goto out4;
1224        }
1225
1226        ino = old_ip->i_ino;
1227        rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1228        if (rc) {
1229            if (rc == -EIO)
1230                jfs_err("jfs_rename: dtInsert returned -EIO");
1231            goto out4;
1232        }
1233        if (S_ISDIR(old_ip->i_mode))
1234            inc_nlink(new_dir);
1235    }
1236    /*
1237     * Remove old directory entry
1238     */
1239
1240    ino = old_ip->i_ino;
1241    rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1242    if (rc) {
1243        jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1244            rc);
1245        txAbort(tid, 1); /* Marks Filesystem dirty */
1246        goto out4;
1247    }
1248    if (S_ISDIR(old_ip->i_mode)) {
1249        drop_nlink(old_dir);
1250        if (old_dir != new_dir) {
1251            /*
1252             * Change inode number of parent for moved directory
1253             */
1254
1255            JFS_IP(old_ip)->i_dtroot.header.idotdot =
1256                cpu_to_le32(new_dir->i_ino);
1257
1258            /* Linelock header of dtree */
1259            tlck = txLock(tid, old_ip,
1260                    (struct metapage *) &JFS_IP(old_ip)->bxflag,
1261                      tlckDTREE | tlckBTROOT | tlckRELINK);
1262            dtlck = (struct dt_lock *) & tlck->lock;
1263            ASSERT(dtlck->index == 0);
1264            lv = & dtlck->lv[0];
1265            lv->offset = 0;
1266            lv->length = 1;
1267            dtlck->index++;
1268        }
1269    }
1270
1271    /*
1272     * Update ctime on changed/moved inodes & mark dirty
1273     */
1274    old_ip->i_ctime = CURRENT_TIME;
1275    mark_inode_dirty(old_ip);
1276
1277    new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1278    mark_inode_dirty(new_dir);
1279
1280    /* Build list of inodes modified by this transaction */
1281    ipcount = 0;
1282    iplist[ipcount++] = old_ip;
1283    if (new_ip)
1284        iplist[ipcount++] = new_ip;
1285    iplist[ipcount++] = old_dir;
1286
1287    if (old_dir != new_dir) {
1288        iplist[ipcount++] = new_dir;
1289        old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1290        mark_inode_dirty(old_dir);
1291    }
1292
1293    /*
1294     * Incomplete truncate of file data can
1295     * result in timing problems unless we synchronously commit the
1296     * transaction.
1297     */
1298    if (new_size)
1299        commit_flag = COMMIT_SYNC;
1300    else
1301        commit_flag = 0;
1302
1303    rc = txCommit(tid, ipcount, iplist, commit_flag);
1304
1305      out4:
1306    txEnd(tid);
1307    if (new_ip)
1308        mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1309    if (old_dir != new_dir)
1310        mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1311    mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1312    mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
1313
1314    while (new_size && (rc == 0)) {
1315        tid = txBegin(new_ip->i_sb, 0);
1316        mutex_lock(&JFS_IP(new_ip)->commit_mutex);
1317        new_size = xtTruncate_pmap(tid, new_ip, new_size);
1318        if (new_size < 0) {
1319            txAbort(tid, 1);
1320            rc = new_size;
1321        } else
1322            rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1323        txEnd(tid);
1324        mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
1325    }
1326    if (new_ip && (new_ip->i_nlink == 0))
1327        set_cflag(COMMIT_Nolink, new_ip);
1328      out3:
1329    free_UCSname(&new_dname);
1330      out2:
1331    free_UCSname(&old_dname);
1332      out1:
1333    if (new_ip && !S_ISDIR(new_ip->i_mode))
1334        IWRITE_UNLOCK(new_ip);
1335    /*
1336     * Truncating the directory index table is not guaranteed. It
1337     * may need to be done iteratively
1338     */
1339    if (test_cflag(COMMIT_Stale, old_dir)) {
1340        if (old_dir->i_size > 1)
1341            jfs_truncate_nolock(old_dir, 0);
1342
1343        clear_cflag(COMMIT_Stale, old_dir);
1344    }
1345
1346    jfs_info("jfs_rename: returning %d", rc);
1347    return rc;
1348}
1349
1350
1351/*
1352 * NAME: jfs_mknod
1353 *
1354 * FUNCTION: Create a special file (device)
1355 */
1356static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1357        int mode, dev_t rdev)
1358{
1359    struct jfs_inode_info *jfs_ip;
1360    struct btstack btstack;
1361    struct component_name dname;
1362    ino_t ino;
1363    struct inode *ip;
1364    struct inode *iplist[2];
1365    int rc;
1366    tid_t tid;
1367    struct tblock *tblk;
1368
1369    if (!new_valid_dev(rdev))
1370        return -EINVAL;
1371
1372    jfs_info("jfs_mknod: %s", dentry->d_name.name);
1373
1374    dquot_initialize(dir);
1375
1376    if ((rc = get_UCSname(&dname, dentry)))
1377        goto out;
1378
1379    ip = ialloc(dir, mode);
1380    if (IS_ERR(ip)) {
1381        rc = PTR_ERR(ip);
1382        goto out1;
1383    }
1384    jfs_ip = JFS_IP(ip);
1385
1386    tid = txBegin(dir->i_sb, 0);
1387
1388    mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1389    mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
1390
1391    rc = jfs_init_acl(tid, ip, dir);
1392    if (rc)
1393        goto out3;
1394
1395    rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
1396    if (rc) {
1397        txAbort(tid, 0);
1398        goto out3;
1399    }
1400
1401    if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1402        txAbort(tid, 0);
1403        goto out3;
1404    }
1405
1406    tblk = tid_to_tblock(tid);
1407    tblk->xflag |= COMMIT_CREATE;
1408    tblk->ino = ip->i_ino;
1409    tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1410
1411    ino = ip->i_ino;
1412    if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1413        txAbort(tid, 0);
1414        goto out3;
1415    }
1416
1417    ip->i_op = &jfs_file_inode_operations;
1418    jfs_ip->dev = new_encode_dev(rdev);
1419    init_special_inode(ip, ip->i_mode, rdev);
1420
1421    mark_inode_dirty(ip);
1422
1423    dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1424
1425    mark_inode_dirty(dir);
1426
1427    iplist[0] = dir;
1428    iplist[1] = ip;
1429    rc = txCommit(tid, 2, iplist, 0);
1430
1431      out3:
1432    txEnd(tid);
1433    mutex_unlock(&JFS_IP(ip)->commit_mutex);
1434    mutex_unlock(&JFS_IP(dir)->commit_mutex);
1435    if (rc) {
1436        free_ea_wmap(ip);
1437        ip->i_nlink = 0;
1438        unlock_new_inode(ip);
1439        iput(ip);
1440    } else {
1441        d_instantiate(dentry, ip);
1442        unlock_new_inode(ip);
1443    }
1444
1445      out1:
1446    free_UCSname(&dname);
1447
1448      out:
1449    jfs_info("jfs_mknod: returning %d", rc);
1450    return rc;
1451}
1452
1453static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1454{
1455    struct btstack btstack;
1456    ino_t inum;
1457    struct inode *ip;
1458    struct component_name key;
1459    const char *name = dentry->d_name.name;
1460    int len = dentry->d_name.len;
1461    int rc;
1462
1463    jfs_info("jfs_lookup: name = %s", name);
1464
1465    if ((name[0] == '.') && (len == 1))
1466        inum = dip->i_ino;
1467    else if (strcmp(name, "..") == 0)
1468        inum = PARENT(dip);
1469    else {
1470        if ((rc = get_UCSname(&key, dentry)))
1471            return ERR_PTR(rc);
1472        rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1473        free_UCSname(&key);
1474        if (rc == -ENOENT) {
1475            d_add(dentry, NULL);
1476            return NULL;
1477        } else if (rc) {
1478            jfs_err("jfs_lookup: dtSearch returned %d", rc);
1479            return ERR_PTR(rc);
1480        }
1481    }
1482
1483    ip = jfs_iget(dip->i_sb, inum);
1484    if (IS_ERR(ip)) {
1485        jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
1486        return ERR_CAST(ip);
1487    }
1488
1489    return d_splice_alias(ip, dentry);
1490}
1491
1492static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1493        u64 ino, u32 generation)
1494{
1495    struct inode *inode;
1496
1497    if (ino == 0)
1498        return ERR_PTR(-ESTALE);
1499    inode = jfs_iget(sb, ino);
1500    if (IS_ERR(inode))
1501        return ERR_CAST(inode);
1502
1503    if (generation && inode->i_generation != generation) {
1504        iput(inode);
1505        return ERR_PTR(-ESTALE);
1506    }
1507
1508    return inode;
1509}
1510
1511struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1512        int fh_len, int fh_type)
1513{
1514    return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1515                    jfs_nfs_get_inode);
1516}
1517
1518struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1519        int fh_len, int fh_type)
1520{
1521    return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1522                    jfs_nfs_get_inode);
1523}
1524
1525struct dentry *jfs_get_parent(struct dentry *dentry)
1526{
1527    unsigned long parent_ino;
1528
1529    parent_ino =
1530        le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
1531
1532    return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino));
1533}
1534
1535const struct inode_operations jfs_dir_inode_operations = {
1536    .create = jfs_create,
1537    .lookup = jfs_lookup,
1538    .link = jfs_link,
1539    .unlink = jfs_unlink,
1540    .symlink = jfs_symlink,
1541    .mkdir = jfs_mkdir,
1542    .rmdir = jfs_rmdir,
1543    .mknod = jfs_mknod,
1544    .rename = jfs_rename,
1545    .setxattr = jfs_setxattr,
1546    .getxattr = jfs_getxattr,
1547    .listxattr = jfs_listxattr,
1548    .removexattr = jfs_removexattr,
1549    .setattr = jfs_setattr,
1550#ifdef CONFIG_JFS_POSIX_ACL
1551    .check_acl = jfs_check_acl,
1552#endif
1553};
1554
1555const struct file_operations jfs_dir_operations = {
1556    .read = generic_read_dir,
1557    .readdir = jfs_readdir,
1558    .fsync = jfs_fsync,
1559    .unlocked_ioctl = jfs_ioctl,
1560#ifdef CONFIG_COMPAT
1561    .compat_ioctl = jfs_compat_ioctl,
1562#endif
1563    .llseek = generic_file_llseek,
1564};
1565
1566static int jfs_ci_hash(const struct dentry *dir, const struct inode *inode,
1567        struct qstr *this)
1568{
1569    unsigned long hash;
1570    int i;
1571
1572    hash = init_name_hash();
1573    for (i=0; i < this->len; i++)
1574        hash = partial_name_hash(tolower(this->name[i]), hash);
1575    this->hash = end_name_hash(hash);
1576
1577    return 0;
1578}
1579
1580static int jfs_ci_compare(const struct dentry *parent,
1581        const struct inode *pinode,
1582        const struct dentry *dentry, const struct inode *inode,
1583        unsigned int len, const char *str, const struct qstr *name)
1584{
1585    int i, result = 1;
1586
1587    if (len != name->len)
1588        goto out;
1589    for (i=0; i < len; i++) {
1590        if (tolower(str[i]) != tolower(name->name[i]))
1591            goto out;
1592    }
1593    result = 0;
1594out:
1595    return result;
1596}
1597
1598static int jfs_ci_revalidate(struct dentry *dentry, struct nameidata *nd)
1599{
1600    if (nd && nd->flags & LOOKUP_RCU)
1601        return -ECHILD;
1602    /*
1603     * This is not negative dentry. Always valid.
1604     *
1605     * Note, rename() to existing directory entry will have ->d_inode,
1606     * and will use existing name which isn't specified name by user.
1607     *
1608     * We may be able to drop this positive dentry here. But dropping
1609     * positive dentry isn't good idea. So it's unsupported like
1610     * rename("filename", "FILENAME") for now.
1611     */
1612    if (dentry->d_inode)
1613        return 1;
1614
1615    /*
1616     * This may be nfsd (or something), anyway, we can't see the
1617     * intent of this. So, since this can be for creation, drop it.
1618     */
1619    if (!nd)
1620        return 0;
1621
1622    /*
1623     * Drop the negative dentry, in order to make sure to use the
1624     * case sensitive name which is specified by user if this is
1625     * for creation.
1626     */
1627    if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
1628        if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1629            return 0;
1630    }
1631    return 1;
1632}
1633
1634const struct dentry_operations jfs_ci_dentry_operations =
1635{
1636    .d_hash = jfs_ci_hash,
1637    .d_compare = jfs_ci_compare,
1638    .d_revalidate = jfs_ci_revalidate,
1639};
1640

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