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1 | /* |
2 | * Copyright (C) International Business Machines Corp., 2000-2004 |
3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License as published by |
7 | * the Free Software Foundation; either version 2 of the License, or |
8 | * (at your option) any later version. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
13 | * the GNU General Public License for more details. |
14 | * |
15 | * You should have received a copy of the GNU General Public License |
16 | * along with this program; if not, write to the Free Software |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
19 | |
20 | #include <linux/fs.h> |
21 | #include <linux/ctype.h> |
22 | #include <linux/quotaops.h> |
23 | #include <linux/exportfs.h> |
24 | #include "jfs_incore.h" |
25 | #include "jfs_superblock.h" |
26 | #include "jfs_inode.h" |
27 | #include "jfs_dinode.h" |
28 | #include "jfs_dmap.h" |
29 | #include "jfs_unicode.h" |
30 | #include "jfs_metapage.h" |
31 | #include "jfs_xattr.h" |
32 | #include "jfs_acl.h" |
33 | #include "jfs_debug.h" |
34 | |
35 | /* |
36 | * forward references |
37 | */ |
38 | const struct dentry_operations jfs_ci_dentry_operations; |
39 | |
40 | static s64 commitZeroLink(tid_t, struct inode *); |
41 | |
42 | /* |
43 | * NAME: free_ea_wmap(inode) |
44 | * |
45 | * FUNCTION: free uncommitted extended attributes from working map |
46 | * |
47 | */ |
48 | static inline void free_ea_wmap(struct inode *inode) |
49 | { |
50 | dxd_t *ea = &JFS_IP(inode)->ea; |
51 | |
52 | if (ea->flag & DXD_EXTENT) { |
53 | /* free EA pages from cache */ |
54 | invalidate_dxd_metapages(inode, *ea); |
55 | dbFree(inode, addressDXD(ea), lengthDXD(ea)); |
56 | } |
57 | ea->flag = 0; |
58 | } |
59 | |
60 | /* |
61 | * NAME: jfs_create(dip, dentry, mode) |
62 | * |
63 | * FUNCTION: create a regular file in the parent directory <dip> |
64 | * with name = <from dentry> and mode = <mode> |
65 | * |
66 | * PARAMETER: dip - parent directory vnode |
67 | * dentry - dentry of new file |
68 | * mode - create mode (rwxrwxrwx). |
69 | * nd- nd struct |
70 | * |
71 | * RETURN: Errors from subroutines |
72 | * |
73 | */ |
74 | static int jfs_create(struct inode *dip, struct dentry *dentry, int mode, |
75 | struct nameidata *nd) |
76 | { |
77 | int rc = 0; |
78 | tid_t tid; /* transaction id */ |
79 | struct inode *ip = NULL; /* child directory inode */ |
80 | ino_t ino; |
81 | struct component_name dname; /* child directory name */ |
82 | struct btstack btstack; |
83 | struct inode *iplist[2]; |
84 | struct tblock *tblk; |
85 | |
86 | jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name); |
87 | |
88 | dquot_initialize(dip); |
89 | |
90 | /* |
91 | * search parent directory for entry/freespace |
92 | * (dtSearch() returns parent directory page pinned) |
93 | */ |
94 | if ((rc = get_UCSname(&dname, dentry))) |
95 | goto out1; |
96 | |
97 | /* |
98 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we |
99 | * block there while holding dtree page, so we allocate the inode & |
100 | * begin the transaction before we search the directory. |
101 | */ |
102 | ip = ialloc(dip, mode); |
103 | if (IS_ERR(ip)) { |
104 | rc = PTR_ERR(ip); |
105 | goto out2; |
106 | } |
107 | |
108 | tid = txBegin(dip->i_sb, 0); |
109 | |
110 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
111 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
112 | |
113 | rc = jfs_init_acl(tid, ip, dip); |
114 | if (rc) |
115 | goto out3; |
116 | |
117 | rc = jfs_init_security(tid, ip, dip); |
118 | if (rc) { |
119 | txAbort(tid, 0); |
120 | goto out3; |
121 | } |
122 | |
123 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
124 | jfs_err("jfs_create: dtSearch returned %d", rc); |
125 | txAbort(tid, 0); |
126 | goto out3; |
127 | } |
128 | |
129 | tblk = tid_to_tblock(tid); |
130 | tblk->xflag |= COMMIT_CREATE; |
131 | tblk->ino = ip->i_ino; |
132 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; |
133 | |
134 | iplist[0] = dip; |
135 | iplist[1] = ip; |
136 | |
137 | /* |
138 | * initialize the child XAD tree root in-line in inode |
139 | */ |
140 | xtInitRoot(tid, ip); |
141 | |
142 | /* |
143 | * create entry in parent directory for child directory |
144 | * (dtInsert() releases parent directory page) |
145 | */ |
146 | ino = ip->i_ino; |
147 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { |
148 | if (rc == -EIO) { |
149 | jfs_err("jfs_create: dtInsert returned -EIO"); |
150 | txAbort(tid, 1); /* Marks Filesystem dirty */ |
151 | } else |
152 | txAbort(tid, 0); /* Filesystem full */ |
153 | goto out3; |
154 | } |
155 | |
156 | ip->i_op = &jfs_file_inode_operations; |
157 | ip->i_fop = &jfs_file_operations; |
158 | ip->i_mapping->a_ops = &jfs_aops; |
159 | |
160 | mark_inode_dirty(ip); |
161 | |
162 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
163 | |
164 | mark_inode_dirty(dip); |
165 | |
166 | rc = txCommit(tid, 2, &iplist[0], 0); |
167 | |
168 | out3: |
169 | txEnd(tid); |
170 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
171 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
172 | if (rc) { |
173 | free_ea_wmap(ip); |
174 | ip->i_nlink = 0; |
175 | unlock_new_inode(ip); |
176 | iput(ip); |
177 | } else { |
178 | d_instantiate(dentry, ip); |
179 | unlock_new_inode(ip); |
180 | } |
181 | |
182 | out2: |
183 | free_UCSname(&dname); |
184 | |
185 | out1: |
186 | |
187 | jfs_info("jfs_create: rc:%d", rc); |
188 | return rc; |
189 | } |
190 | |
191 | |
192 | /* |
193 | * NAME: jfs_mkdir(dip, dentry, mode) |
194 | * |
195 | * FUNCTION: create a child directory in the parent directory <dip> |
196 | * with name = <from dentry> and mode = <mode> |
197 | * |
198 | * PARAMETER: dip - parent directory vnode |
199 | * dentry - dentry of child directory |
200 | * mode - create mode (rwxrwxrwx). |
201 | * |
202 | * RETURN: Errors from subroutines |
203 | * |
204 | * note: |
205 | * EACCESS: user needs search+write permission on the parent directory |
206 | */ |
207 | static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode) |
208 | { |
209 | int rc = 0; |
210 | tid_t tid; /* transaction id */ |
211 | struct inode *ip = NULL; /* child directory inode */ |
212 | ino_t ino; |
213 | struct component_name dname; /* child directory name */ |
214 | struct btstack btstack; |
215 | struct inode *iplist[2]; |
216 | struct tblock *tblk; |
217 | |
218 | jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name); |
219 | |
220 | dquot_initialize(dip); |
221 | |
222 | /* link count overflow on parent directory ? */ |
223 | if (dip->i_nlink == JFS_LINK_MAX) { |
224 | rc = -EMLINK; |
225 | goto out1; |
226 | } |
227 | |
228 | /* |
229 | * search parent directory for entry/freespace |
230 | * (dtSearch() returns parent directory page pinned) |
231 | */ |
232 | if ((rc = get_UCSname(&dname, dentry))) |
233 | goto out1; |
234 | |
235 | /* |
236 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we |
237 | * block there while holding dtree page, so we allocate the inode & |
238 | * begin the transaction before we search the directory. |
239 | */ |
240 | ip = ialloc(dip, S_IFDIR | mode); |
241 | if (IS_ERR(ip)) { |
242 | rc = PTR_ERR(ip); |
243 | goto out2; |
244 | } |
245 | |
246 | tid = txBegin(dip->i_sb, 0); |
247 | |
248 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
249 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
250 | |
251 | rc = jfs_init_acl(tid, ip, dip); |
252 | if (rc) |
253 | goto out3; |
254 | |
255 | rc = jfs_init_security(tid, ip, dip); |
256 | if (rc) { |
257 | txAbort(tid, 0); |
258 | goto out3; |
259 | } |
260 | |
261 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
262 | jfs_err("jfs_mkdir: dtSearch returned %d", rc); |
263 | txAbort(tid, 0); |
264 | goto out3; |
265 | } |
266 | |
267 | tblk = tid_to_tblock(tid); |
268 | tblk->xflag |= COMMIT_CREATE; |
269 | tblk->ino = ip->i_ino; |
270 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; |
271 | |
272 | iplist[0] = dip; |
273 | iplist[1] = ip; |
274 | |
275 | /* |
276 | * initialize the child directory in-line in inode |
277 | */ |
278 | dtInitRoot(tid, ip, dip->i_ino); |
279 | |
280 | /* |
281 | * create entry in parent directory for child directory |
282 | * (dtInsert() releases parent directory page) |
283 | */ |
284 | ino = ip->i_ino; |
285 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { |
286 | if (rc == -EIO) { |
287 | jfs_err("jfs_mkdir: dtInsert returned -EIO"); |
288 | txAbort(tid, 1); /* Marks Filesystem dirty */ |
289 | } else |
290 | txAbort(tid, 0); /* Filesystem full */ |
291 | goto out3; |
292 | } |
293 | |
294 | ip->i_nlink = 2; /* for '.' */ |
295 | ip->i_op = &jfs_dir_inode_operations; |
296 | ip->i_fop = &jfs_dir_operations; |
297 | |
298 | mark_inode_dirty(ip); |
299 | |
300 | /* update parent directory inode */ |
301 | inc_nlink(dip); /* for '..' from child directory */ |
302 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
303 | mark_inode_dirty(dip); |
304 | |
305 | rc = txCommit(tid, 2, &iplist[0], 0); |
306 | |
307 | out3: |
308 | txEnd(tid); |
309 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
310 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
311 | if (rc) { |
312 | free_ea_wmap(ip); |
313 | ip->i_nlink = 0; |
314 | unlock_new_inode(ip); |
315 | iput(ip); |
316 | } else { |
317 | d_instantiate(dentry, ip); |
318 | unlock_new_inode(ip); |
319 | } |
320 | |
321 | out2: |
322 | free_UCSname(&dname); |
323 | |
324 | |
325 | out1: |
326 | |
327 | jfs_info("jfs_mkdir: rc:%d", rc); |
328 | return rc; |
329 | } |
330 | |
331 | /* |
332 | * NAME: jfs_rmdir(dip, dentry) |
333 | * |
334 | * FUNCTION: remove a link to child directory |
335 | * |
336 | * PARAMETER: dip - parent inode |
337 | * dentry - child directory dentry |
338 | * |
339 | * RETURN: -EINVAL - if name is . or .. |
340 | * -EINVAL - if . or .. exist but are invalid. |
341 | * errors from subroutines |
342 | * |
343 | * note: |
344 | * if other threads have the directory open when the last link |
345 | * is removed, the "." and ".." entries, if present, are removed before |
346 | * rmdir() returns and no new entries may be created in the directory, |
347 | * but the directory is not removed until the last reference to |
348 | * the directory is released (cf.unlink() of regular file). |
349 | */ |
350 | static int jfs_rmdir(struct inode *dip, struct dentry *dentry) |
351 | { |
352 | int rc; |
353 | tid_t tid; /* transaction id */ |
354 | struct inode *ip = dentry->d_inode; |
355 | ino_t ino; |
356 | struct component_name dname; |
357 | struct inode *iplist[2]; |
358 | struct tblock *tblk; |
359 | |
360 | jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name); |
361 | |
362 | /* Init inode for quota operations. */ |
363 | dquot_initialize(dip); |
364 | dquot_initialize(ip); |
365 | |
366 | /* directory must be empty to be removed */ |
367 | if (!dtEmpty(ip)) { |
368 | rc = -ENOTEMPTY; |
369 | goto out; |
370 | } |
371 | |
372 | if ((rc = get_UCSname(&dname, dentry))) { |
373 | goto out; |
374 | } |
375 | |
376 | tid = txBegin(dip->i_sb, 0); |
377 | |
378 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
379 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
380 | |
381 | iplist[0] = dip; |
382 | iplist[1] = ip; |
383 | |
384 | tblk = tid_to_tblock(tid); |
385 | tblk->xflag |= COMMIT_DELETE; |
386 | tblk->u.ip = ip; |
387 | |
388 | /* |
389 | * delete the entry of target directory from parent directory |
390 | */ |
391 | ino = ip->i_ino; |
392 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { |
393 | jfs_err("jfs_rmdir: dtDelete returned %d", rc); |
394 | if (rc == -EIO) |
395 | txAbort(tid, 1); |
396 | txEnd(tid); |
397 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
398 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
399 | |
400 | goto out2; |
401 | } |
402 | |
403 | /* update parent directory's link count corresponding |
404 | * to ".." entry of the target directory deleted |
405 | */ |
406 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
407 | inode_dec_link_count(dip); |
408 | |
409 | /* |
410 | * OS/2 could have created EA and/or ACL |
411 | */ |
412 | /* free EA from both persistent and working map */ |
413 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { |
414 | /* free EA pages */ |
415 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); |
416 | } |
417 | JFS_IP(ip)->ea.flag = 0; |
418 | |
419 | /* free ACL from both persistent and working map */ |
420 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { |
421 | /* free ACL pages */ |
422 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); |
423 | } |
424 | JFS_IP(ip)->acl.flag = 0; |
425 | |
426 | /* mark the target directory as deleted */ |
427 | clear_nlink(ip); |
428 | mark_inode_dirty(ip); |
429 | |
430 | rc = txCommit(tid, 2, &iplist[0], 0); |
431 | |
432 | txEnd(tid); |
433 | |
434 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
435 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
436 | |
437 | /* |
438 | * Truncating the directory index table is not guaranteed. It |
439 | * may need to be done iteratively |
440 | */ |
441 | if (test_cflag(COMMIT_Stale, dip)) { |
442 | if (dip->i_size > 1) |
443 | jfs_truncate_nolock(dip, 0); |
444 | |
445 | clear_cflag(COMMIT_Stale, dip); |
446 | } |
447 | |
448 | out2: |
449 | free_UCSname(&dname); |
450 | |
451 | out: |
452 | jfs_info("jfs_rmdir: rc:%d", rc); |
453 | return rc; |
454 | } |
455 | |
456 | /* |
457 | * NAME: jfs_unlink(dip, dentry) |
458 | * |
459 | * FUNCTION: remove a link to object <vp> named by <name> |
460 | * from parent directory <dvp> |
461 | * |
462 | * PARAMETER: dip - inode of parent directory |
463 | * dentry - dentry of object to be removed |
464 | * |
465 | * RETURN: errors from subroutines |
466 | * |
467 | * note: |
468 | * temporary file: if one or more processes have the file open |
469 | * when the last link is removed, the link will be removed before |
470 | * unlink() returns, but the removal of the file contents will be |
471 | * postponed until all references to the files are closed. |
472 | * |
473 | * JFS does NOT support unlink() on directories. |
474 | * |
475 | */ |
476 | static int jfs_unlink(struct inode *dip, struct dentry *dentry) |
477 | { |
478 | int rc; |
479 | tid_t tid; /* transaction id */ |
480 | struct inode *ip = dentry->d_inode; |
481 | ino_t ino; |
482 | struct component_name dname; /* object name */ |
483 | struct inode *iplist[2]; |
484 | struct tblock *tblk; |
485 | s64 new_size = 0; |
486 | int commit_flag; |
487 | |
488 | jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name); |
489 | |
490 | /* Init inode for quota operations. */ |
491 | dquot_initialize(dip); |
492 | dquot_initialize(ip); |
493 | |
494 | if ((rc = get_UCSname(&dname, dentry))) |
495 | goto out; |
496 | |
497 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
498 | |
499 | tid = txBegin(dip->i_sb, 0); |
500 | |
501 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
502 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
503 | |
504 | iplist[0] = dip; |
505 | iplist[1] = ip; |
506 | |
507 | /* |
508 | * delete the entry of target file from parent directory |
509 | */ |
510 | ino = ip->i_ino; |
511 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { |
512 | jfs_err("jfs_unlink: dtDelete returned %d", rc); |
513 | if (rc == -EIO) |
514 | txAbort(tid, 1); /* Marks FS Dirty */ |
515 | txEnd(tid); |
516 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
517 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
518 | IWRITE_UNLOCK(ip); |
519 | goto out1; |
520 | } |
521 | |
522 | ASSERT(ip->i_nlink); |
523 | |
524 | ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
525 | mark_inode_dirty(dip); |
526 | |
527 | /* update target's inode */ |
528 | inode_dec_link_count(ip); |
529 | |
530 | /* |
531 | * commit zero link count object |
532 | */ |
533 | if (ip->i_nlink == 0) { |
534 | assert(!test_cflag(COMMIT_Nolink, ip)); |
535 | /* free block resources */ |
536 | if ((new_size = commitZeroLink(tid, ip)) < 0) { |
537 | txAbort(tid, 1); /* Marks FS Dirty */ |
538 | txEnd(tid); |
539 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
540 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
541 | IWRITE_UNLOCK(ip); |
542 | rc = new_size; |
543 | goto out1; |
544 | } |
545 | tblk = tid_to_tblock(tid); |
546 | tblk->xflag |= COMMIT_DELETE; |
547 | tblk->u.ip = ip; |
548 | } |
549 | |
550 | /* |
551 | * Incomplete truncate of file data can |
552 | * result in timing problems unless we synchronously commit the |
553 | * transaction. |
554 | */ |
555 | if (new_size) |
556 | commit_flag = COMMIT_SYNC; |
557 | else |
558 | commit_flag = 0; |
559 | |
560 | /* |
561 | * If xtTruncate was incomplete, commit synchronously to avoid |
562 | * timing complications |
563 | */ |
564 | rc = txCommit(tid, 2, &iplist[0], commit_flag); |
565 | |
566 | txEnd(tid); |
567 | |
568 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
569 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
570 | |
571 | while (new_size && (rc == 0)) { |
572 | tid = txBegin(dip->i_sb, 0); |
573 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
574 | new_size = xtTruncate_pmap(tid, ip, new_size); |
575 | if (new_size < 0) { |
576 | txAbort(tid, 1); /* Marks FS Dirty */ |
577 | rc = new_size; |
578 | } else |
579 | rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); |
580 | txEnd(tid); |
581 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
582 | } |
583 | |
584 | if (ip->i_nlink == 0) |
585 | set_cflag(COMMIT_Nolink, ip); |
586 | |
587 | IWRITE_UNLOCK(ip); |
588 | |
589 | /* |
590 | * Truncating the directory index table is not guaranteed. It |
591 | * may need to be done iteratively |
592 | */ |
593 | if (test_cflag(COMMIT_Stale, dip)) { |
594 | if (dip->i_size > 1) |
595 | jfs_truncate_nolock(dip, 0); |
596 | |
597 | clear_cflag(COMMIT_Stale, dip); |
598 | } |
599 | |
600 | out1: |
601 | free_UCSname(&dname); |
602 | out: |
603 | jfs_info("jfs_unlink: rc:%d", rc); |
604 | return rc; |
605 | } |
606 | |
607 | /* |
608 | * NAME: commitZeroLink() |
609 | * |
610 | * FUNCTION: for non-directory, called by jfs_remove(), |
611 | * truncate a regular file, directory or symbolic |
612 | * link to zero length. return 0 if type is not |
613 | * one of these. |
614 | * |
615 | * if the file is currently associated with a VM segment |
616 | * only permanent disk and inode map resources are freed, |
617 | * and neither the inode nor indirect blocks are modified |
618 | * so that the resources can be later freed in the work |
619 | * map by ctrunc1. |
620 | * if there is no VM segment on entry, the resources are |
621 | * freed in both work and permanent map. |
622 | * (? for temporary file - memory object is cached even |
623 | * after no reference: |
624 | * reference count > 0 - ) |
625 | * |
626 | * PARAMETERS: cd - pointer to commit data structure. |
627 | * current inode is the one to truncate. |
628 | * |
629 | * RETURN: Errors from subroutines |
630 | */ |
631 | static s64 commitZeroLink(tid_t tid, struct inode *ip) |
632 | { |
633 | int filetype; |
634 | struct tblock *tblk; |
635 | |
636 | jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); |
637 | |
638 | filetype = ip->i_mode & S_IFMT; |
639 | switch (filetype) { |
640 | case S_IFREG: |
641 | break; |
642 | case S_IFLNK: |
643 | /* fast symbolic link */ |
644 | if (ip->i_size < IDATASIZE) { |
645 | ip->i_size = 0; |
646 | return 0; |
647 | } |
648 | break; |
649 | default: |
650 | assert(filetype != S_IFDIR); |
651 | return 0; |
652 | } |
653 | |
654 | set_cflag(COMMIT_Freewmap, ip); |
655 | |
656 | /* mark transaction of block map update type */ |
657 | tblk = tid_to_tblock(tid); |
658 | tblk->xflag |= COMMIT_PMAP; |
659 | |
660 | /* |
661 | * free EA |
662 | */ |
663 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) |
664 | /* acquire maplock on EA to be freed from block map */ |
665 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); |
666 | |
667 | /* |
668 | * free ACL |
669 | */ |
670 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) |
671 | /* acquire maplock on EA to be freed from block map */ |
672 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); |
673 | |
674 | /* |
675 | * free xtree/data (truncate to zero length): |
676 | * free xtree/data pages from cache if COMMIT_PWMAP, |
677 | * free xtree/data blocks from persistent block map, and |
678 | * free xtree/data blocks from working block map if COMMIT_PWMAP; |
679 | */ |
680 | if (ip->i_size) |
681 | return xtTruncate_pmap(tid, ip, 0); |
682 | |
683 | return 0; |
684 | } |
685 | |
686 | |
687 | /* |
688 | * NAME: jfs_free_zero_link() |
689 | * |
690 | * FUNCTION: for non-directory, called by iClose(), |
691 | * free resources of a file from cache and WORKING map |
692 | * for a file previously committed with zero link count |
693 | * while associated with a pager object, |
694 | * |
695 | * PARAMETER: ip - pointer to inode of file. |
696 | */ |
697 | void jfs_free_zero_link(struct inode *ip) |
698 | { |
699 | int type; |
700 | |
701 | jfs_info("jfs_free_zero_link: ip = 0x%p", ip); |
702 | |
703 | /* return if not reg or symbolic link or if size is |
704 | * already ok. |
705 | */ |
706 | type = ip->i_mode & S_IFMT; |
707 | |
708 | switch (type) { |
709 | case S_IFREG: |
710 | break; |
711 | case S_IFLNK: |
712 | /* if its contained in inode nothing to do */ |
713 | if (ip->i_size < IDATASIZE) |
714 | return; |
715 | break; |
716 | default: |
717 | return; |
718 | } |
719 | |
720 | /* |
721 | * free EA |
722 | */ |
723 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { |
724 | s64 xaddr = addressDXD(&JFS_IP(ip)->ea); |
725 | int xlen = lengthDXD(&JFS_IP(ip)->ea); |
726 | struct maplock maplock; /* maplock for COMMIT_WMAP */ |
727 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ |
728 | |
729 | /* free EA pages from cache */ |
730 | invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); |
731 | |
732 | /* free EA extent from working block map */ |
733 | maplock.index = 1; |
734 | pxdlock = (struct pxd_lock *) & maplock; |
735 | pxdlock->flag = mlckFREEPXD; |
736 | PXDaddress(&pxdlock->pxd, xaddr); |
737 | PXDlength(&pxdlock->pxd, xlen); |
738 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); |
739 | } |
740 | |
741 | /* |
742 | * free ACL |
743 | */ |
744 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { |
745 | s64 xaddr = addressDXD(&JFS_IP(ip)->acl); |
746 | int xlen = lengthDXD(&JFS_IP(ip)->acl); |
747 | struct maplock maplock; /* maplock for COMMIT_WMAP */ |
748 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ |
749 | |
750 | invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); |
751 | |
752 | /* free ACL extent from working block map */ |
753 | maplock.index = 1; |
754 | pxdlock = (struct pxd_lock *) & maplock; |
755 | pxdlock->flag = mlckFREEPXD; |
756 | PXDaddress(&pxdlock->pxd, xaddr); |
757 | PXDlength(&pxdlock->pxd, xlen); |
758 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); |
759 | } |
760 | |
761 | /* |
762 | * free xtree/data (truncate to zero length): |
763 | * free xtree/data pages from cache, and |
764 | * free xtree/data blocks from working block map; |
765 | */ |
766 | if (ip->i_size) |
767 | xtTruncate(0, ip, 0, COMMIT_WMAP); |
768 | } |
769 | |
770 | /* |
771 | * NAME: jfs_link(vp, dvp, name, crp) |
772 | * |
773 | * FUNCTION: create a link to <vp> by the name = <name> |
774 | * in the parent directory <dvp> |
775 | * |
776 | * PARAMETER: vp - target object |
777 | * dvp - parent directory of new link |
778 | * name - name of new link to target object |
779 | * crp - credential |
780 | * |
781 | * RETURN: Errors from subroutines |
782 | * |
783 | * note: |
784 | * JFS does NOT support link() on directories (to prevent circular |
785 | * path in the directory hierarchy); |
786 | * EPERM: the target object is a directory, and either the caller |
787 | * does not have appropriate privileges or the implementation prohibits |
788 | * using link() on directories [XPG4.2]. |
789 | * |
790 | * JFS does NOT support links between file systems: |
791 | * EXDEV: target object and new link are on different file systems and |
792 | * implementation does not support links between file systems [XPG4.2]. |
793 | */ |
794 | static int jfs_link(struct dentry *old_dentry, |
795 | struct inode *dir, struct dentry *dentry) |
796 | { |
797 | int rc; |
798 | tid_t tid; |
799 | struct inode *ip = old_dentry->d_inode; |
800 | ino_t ino; |
801 | struct component_name dname; |
802 | struct btstack btstack; |
803 | struct inode *iplist[2]; |
804 | |
805 | jfs_info("jfs_link: %s %s", old_dentry->d_name.name, |
806 | dentry->d_name.name); |
807 | |
808 | if (ip->i_nlink == JFS_LINK_MAX) |
809 | return -EMLINK; |
810 | |
811 | if (ip->i_nlink == 0) |
812 | return -ENOENT; |
813 | |
814 | dquot_initialize(dir); |
815 | |
816 | tid = txBegin(ip->i_sb, 0); |
817 | |
818 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
819 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
820 | |
821 | /* |
822 | * scan parent directory for entry/freespace |
823 | */ |
824 | if ((rc = get_UCSname(&dname, dentry))) |
825 | goto out; |
826 | |
827 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) |
828 | goto free_dname; |
829 | |
830 | /* |
831 | * create entry for new link in parent directory |
832 | */ |
833 | ino = ip->i_ino; |
834 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) |
835 | goto free_dname; |
836 | |
837 | /* update object inode */ |
838 | inc_nlink(ip); /* for new link */ |
839 | ip->i_ctime = CURRENT_TIME; |
840 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
841 | mark_inode_dirty(dir); |
842 | atomic_inc(&ip->i_count); |
843 | |
844 | iplist[0] = ip; |
845 | iplist[1] = dir; |
846 | rc = txCommit(tid, 2, &iplist[0], 0); |
847 | |
848 | if (rc) { |
849 | ip->i_nlink--; /* never instantiated */ |
850 | iput(ip); |
851 | } else |
852 | d_instantiate(dentry, ip); |
853 | |
854 | free_dname: |
855 | free_UCSname(&dname); |
856 | |
857 | out: |
858 | txEnd(tid); |
859 | |
860 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
861 | mutex_unlock(&JFS_IP(dir)->commit_mutex); |
862 | |
863 | jfs_info("jfs_link: rc:%d", rc); |
864 | return rc; |
865 | } |
866 | |
867 | /* |
868 | * NAME: jfs_symlink(dip, dentry, name) |
869 | * |
870 | * FUNCTION: creates a symbolic link to <symlink> by name <name> |
871 | * in directory <dip> |
872 | * |
873 | * PARAMETER: dip - parent directory vnode |
874 | * dentry - dentry of symbolic link |
875 | * name - the path name of the existing object |
876 | * that will be the source of the link |
877 | * |
878 | * RETURN: errors from subroutines |
879 | * |
880 | * note: |
881 | * ENAMETOOLONG: pathname resolution of a symbolic link produced |
882 | * an intermediate result whose length exceeds PATH_MAX [XPG4.2] |
883 | */ |
884 | |
885 | static int jfs_symlink(struct inode *dip, struct dentry *dentry, |
886 | const char *name) |
887 | { |
888 | int rc; |
889 | tid_t tid; |
890 | ino_t ino = 0; |
891 | struct component_name dname; |
892 | int ssize; /* source pathname size */ |
893 | struct btstack btstack; |
894 | struct inode *ip = dentry->d_inode; |
895 | unchar *i_fastsymlink; |
896 | s64 xlen = 0; |
897 | int bmask = 0, xsize; |
898 | s64 extent = 0, xaddr; |
899 | struct metapage *mp; |
900 | struct super_block *sb; |
901 | struct tblock *tblk; |
902 | |
903 | struct inode *iplist[2]; |
904 | |
905 | jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); |
906 | |
907 | dquot_initialize(dip); |
908 | |
909 | ssize = strlen(name) + 1; |
910 | |
911 | /* |
912 | * search parent directory for entry/freespace |
913 | * (dtSearch() returns parent directory page pinned) |
914 | */ |
915 | |
916 | if ((rc = get_UCSname(&dname, dentry))) |
917 | goto out1; |
918 | |
919 | /* |
920 | * allocate on-disk/in-memory inode for symbolic link: |
921 | * (iAlloc() returns new, locked inode) |
922 | */ |
923 | ip = ialloc(dip, S_IFLNK | 0777); |
924 | if (IS_ERR(ip)) { |
925 | rc = PTR_ERR(ip); |
926 | goto out2; |
927 | } |
928 | |
929 | tid = txBegin(dip->i_sb, 0); |
930 | |
931 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
932 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
933 | |
934 | rc = jfs_init_security(tid, ip, dip); |
935 | if (rc) |
936 | goto out3; |
937 | |
938 | tblk = tid_to_tblock(tid); |
939 | tblk->xflag |= COMMIT_CREATE; |
940 | tblk->ino = ip->i_ino; |
941 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; |
942 | |
943 | /* fix symlink access permission |
944 | * (dir_create() ANDs in the u.u_cmask, |
945 | * but symlinks really need to be 777 access) |
946 | */ |
947 | ip->i_mode |= 0777; |
948 | |
949 | /* |
950 | * write symbolic link target path name |
951 | */ |
952 | xtInitRoot(tid, ip); |
953 | |
954 | /* |
955 | * write source path name inline in on-disk inode (fast symbolic link) |
956 | */ |
957 | |
958 | if (ssize <= IDATASIZE) { |
959 | ip->i_op = &jfs_symlink_inode_operations; |
960 | |
961 | i_fastsymlink = JFS_IP(ip)->i_inline; |
962 | memcpy(i_fastsymlink, name, ssize); |
963 | ip->i_size = ssize - 1; |
964 | |
965 | /* |
966 | * if symlink is > 128 bytes, we don't have the space to |
967 | * store inline extended attributes |
968 | */ |
969 | if (ssize > sizeof (JFS_IP(ip)->i_inline)) |
970 | JFS_IP(ip)->mode2 &= ~INLINEEA; |
971 | |
972 | jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", |
973 | ssize, name); |
974 | } |
975 | /* |
976 | * write source path name in a single extent |
977 | */ |
978 | else { |
979 | jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); |
980 | |
981 | ip->i_op = &page_symlink_inode_operations; |
982 | ip->i_mapping->a_ops = &jfs_aops; |
983 | |
984 | /* |
985 | * even though the data of symlink object (source |
986 | * path name) is treated as non-journaled user data, |
987 | * it is read/written thru buffer cache for performance. |
988 | */ |
989 | sb = ip->i_sb; |
990 | bmask = JFS_SBI(sb)->bsize - 1; |
991 | xsize = (ssize + bmask) & ~bmask; |
992 | xaddr = 0; |
993 | xlen = xsize >> JFS_SBI(sb)->l2bsize; |
994 | if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { |
995 | txAbort(tid, 0); |
996 | goto out3; |
997 | } |
998 | extent = xaddr; |
999 | ip->i_size = ssize - 1; |
1000 | while (ssize) { |
1001 | /* This is kind of silly since PATH_MAX == 4K */ |
1002 | int copy_size = min(ssize, PSIZE); |
1003 | |
1004 | mp = get_metapage(ip, xaddr, PSIZE, 1); |
1005 | |
1006 | if (mp == NULL) { |
1007 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); |
1008 | rc = -EIO; |
1009 | txAbort(tid, 0); |
1010 | goto out3; |
1011 | } |
1012 | memcpy(mp->data, name, copy_size); |
1013 | flush_metapage(mp); |
1014 | ssize -= copy_size; |
1015 | name += copy_size; |
1016 | xaddr += JFS_SBI(sb)->nbperpage; |
1017 | } |
1018 | } |
1019 | |
1020 | /* |
1021 | * create entry for symbolic link in parent directory |
1022 | */ |
1023 | rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); |
1024 | if (rc == 0) { |
1025 | ino = ip->i_ino; |
1026 | rc = dtInsert(tid, dip, &dname, &ino, &btstack); |
1027 | } |
1028 | if (rc) { |
1029 | if (xlen) |
1030 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); |
1031 | txAbort(tid, 0); |
1032 | /* discard new inode */ |
1033 | goto out3; |
1034 | } |
1035 | |
1036 | mark_inode_dirty(ip); |
1037 | |
1038 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
1039 | mark_inode_dirty(dip); |
1040 | /* |
1041 | * commit update of parent directory and link object |
1042 | */ |
1043 | |
1044 | iplist[0] = dip; |
1045 | iplist[1] = ip; |
1046 | rc = txCommit(tid, 2, &iplist[0], 0); |
1047 | |
1048 | out3: |
1049 | txEnd(tid); |
1050 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1051 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1052 | if (rc) { |
1053 | free_ea_wmap(ip); |
1054 | ip->i_nlink = 0; |
1055 | unlock_new_inode(ip); |
1056 | iput(ip); |
1057 | } else { |
1058 | d_instantiate(dentry, ip); |
1059 | unlock_new_inode(ip); |
1060 | } |
1061 | |
1062 | out2: |
1063 | free_UCSname(&dname); |
1064 | |
1065 | out1: |
1066 | jfs_info("jfs_symlink: rc:%d", rc); |
1067 | return rc; |
1068 | } |
1069 | |
1070 | |
1071 | /* |
1072 | * NAME: jfs_rename |
1073 | * |
1074 | * FUNCTION: rename a file or directory |
1075 | */ |
1076 | static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
1077 | struct inode *new_dir, struct dentry *new_dentry) |
1078 | { |
1079 | struct btstack btstack; |
1080 | ino_t ino; |
1081 | struct component_name new_dname; |
1082 | struct inode *new_ip; |
1083 | struct component_name old_dname; |
1084 | struct inode *old_ip; |
1085 | int rc; |
1086 | tid_t tid; |
1087 | struct tlock *tlck; |
1088 | struct dt_lock *dtlck; |
1089 | struct lv *lv; |
1090 | int ipcount; |
1091 | struct inode *iplist[4]; |
1092 | struct tblock *tblk; |
1093 | s64 new_size = 0; |
1094 | int commit_flag; |
1095 | |
1096 | |
1097 | jfs_info("jfs_rename: %s %s", old_dentry->d_name.name, |
1098 | new_dentry->d_name.name); |
1099 | |
1100 | dquot_initialize(old_dir); |
1101 | dquot_initialize(new_dir); |
1102 | |
1103 | old_ip = old_dentry->d_inode; |
1104 | new_ip = new_dentry->d_inode; |
1105 | |
1106 | if ((rc = get_UCSname(&old_dname, old_dentry))) |
1107 | goto out1; |
1108 | |
1109 | if ((rc = get_UCSname(&new_dname, new_dentry))) |
1110 | goto out2; |
1111 | |
1112 | /* |
1113 | * Make sure source inode number is what we think it is |
1114 | */ |
1115 | rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); |
1116 | if (rc || (ino != old_ip->i_ino)) { |
1117 | rc = -ENOENT; |
1118 | goto out3; |
1119 | } |
1120 | |
1121 | /* |
1122 | * Make sure dest inode number (if any) is what we think it is |
1123 | */ |
1124 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); |
1125 | if (!rc) { |
1126 | if ((!new_ip) || (ino != new_ip->i_ino)) { |
1127 | rc = -ESTALE; |
1128 | goto out3; |
1129 | } |
1130 | } else if (rc != -ENOENT) |
1131 | goto out3; |
1132 | else if (new_ip) { |
1133 | /* no entry exists, but one was expected */ |
1134 | rc = -ESTALE; |
1135 | goto out3; |
1136 | } |
1137 | |
1138 | if (S_ISDIR(old_ip->i_mode)) { |
1139 | if (new_ip) { |
1140 | if (!dtEmpty(new_ip)) { |
1141 | rc = -ENOTEMPTY; |
1142 | goto out3; |
1143 | } |
1144 | } else if ((new_dir != old_dir) && |
1145 | (new_dir->i_nlink == JFS_LINK_MAX)) { |
1146 | rc = -EMLINK; |
1147 | goto out3; |
1148 | } |
1149 | } else if (new_ip) { |
1150 | IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); |
1151 | /* Init inode for quota operations. */ |
1152 | dquot_initialize(new_ip); |
1153 | } |
1154 | |
1155 | /* |
1156 | * The real work starts here |
1157 | */ |
1158 | tid = txBegin(new_dir->i_sb, 0); |
1159 | |
1160 | /* |
1161 | * How do we know the locking is safe from deadlocks? |
1162 | * The vfs does the hard part for us. Any time we are taking nested |
1163 | * commit_mutexes, the vfs already has i_mutex held on the parent. |
1164 | * Here, the vfs has already taken i_mutex on both old_dir and new_dir. |
1165 | */ |
1166 | mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
1167 | mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
1168 | if (old_dir != new_dir) |
1169 | mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, |
1170 | COMMIT_MUTEX_SECOND_PARENT); |
1171 | |
1172 | if (new_ip) { |
1173 | mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, |
1174 | COMMIT_MUTEX_VICTIM); |
1175 | /* |
1176 | * Change existing directory entry to new inode number |
1177 | */ |
1178 | ino = new_ip->i_ino; |
1179 | rc = dtModify(tid, new_dir, &new_dname, &ino, |
1180 | old_ip->i_ino, JFS_RENAME); |
1181 | if (rc) |
1182 | goto out4; |
1183 | drop_nlink(new_ip); |
1184 | if (S_ISDIR(new_ip->i_mode)) { |
1185 | drop_nlink(new_ip); |
1186 | if (new_ip->i_nlink) { |
1187 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1188 | if (old_dir != new_dir) |
1189 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); |
1190 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); |
1191 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); |
1192 | if (!S_ISDIR(old_ip->i_mode) && new_ip) |
1193 | IWRITE_UNLOCK(new_ip); |
1194 | jfs_error(new_ip->i_sb, |
1195 | "jfs_rename: new_ip->i_nlink != 0"); |
1196 | return -EIO; |
1197 | } |
1198 | tblk = tid_to_tblock(tid); |
1199 | tblk->xflag |= COMMIT_DELETE; |
1200 | tblk->u.ip = new_ip; |
1201 | } else if (new_ip->i_nlink == 0) { |
1202 | assert(!test_cflag(COMMIT_Nolink, new_ip)); |
1203 | /* free block resources */ |
1204 | if ((new_size = commitZeroLink(tid, new_ip)) < 0) { |
1205 | txAbort(tid, 1); /* Marks FS Dirty */ |
1206 | rc = new_size; |
1207 | goto out4; |
1208 | } |
1209 | tblk = tid_to_tblock(tid); |
1210 | tblk->xflag |= COMMIT_DELETE; |
1211 | tblk->u.ip = new_ip; |
1212 | } else { |
1213 | new_ip->i_ctime = CURRENT_TIME; |
1214 | mark_inode_dirty(new_ip); |
1215 | } |
1216 | } else { |
1217 | /* |
1218 | * Add new directory entry |
1219 | */ |
1220 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, |
1221 | JFS_CREATE); |
1222 | if (rc) { |
1223 | jfs_err("jfs_rename didn't expect dtSearch to fail " |
1224 | "w/rc = %d", rc); |
1225 | goto out4; |
1226 | } |
1227 | |
1228 | ino = old_ip->i_ino; |
1229 | rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); |
1230 | if (rc) { |
1231 | if (rc == -EIO) |
1232 | jfs_err("jfs_rename: dtInsert returned -EIO"); |
1233 | goto out4; |
1234 | } |
1235 | if (S_ISDIR(old_ip->i_mode)) |
1236 | inc_nlink(new_dir); |
1237 | } |
1238 | /* |
1239 | * Remove old directory entry |
1240 | */ |
1241 | |
1242 | ino = old_ip->i_ino; |
1243 | rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); |
1244 | if (rc) { |
1245 | jfs_err("jfs_rename did not expect dtDelete to return rc = %d", |
1246 | rc); |
1247 | txAbort(tid, 1); /* Marks Filesystem dirty */ |
1248 | goto out4; |
1249 | } |
1250 | if (S_ISDIR(old_ip->i_mode)) { |
1251 | drop_nlink(old_dir); |
1252 | if (old_dir != new_dir) { |
1253 | /* |
1254 | * Change inode number of parent for moved directory |
1255 | */ |
1256 | |
1257 | JFS_IP(old_ip)->i_dtroot.header.idotdot = |
1258 | cpu_to_le32(new_dir->i_ino); |
1259 | |
1260 | /* Linelock header of dtree */ |
1261 | tlck = txLock(tid, old_ip, |
1262 | (struct metapage *) &JFS_IP(old_ip)->bxflag, |
1263 | tlckDTREE | tlckBTROOT | tlckRELINK); |
1264 | dtlck = (struct dt_lock *) & tlck->lock; |
1265 | ASSERT(dtlck->index == 0); |
1266 | lv = & dtlck->lv[0]; |
1267 | lv->offset = 0; |
1268 | lv->length = 1; |
1269 | dtlck->index++; |
1270 | } |
1271 | } |
1272 | |
1273 | /* |
1274 | * Update ctime on changed/moved inodes & mark dirty |
1275 | */ |
1276 | old_ip->i_ctime = CURRENT_TIME; |
1277 | mark_inode_dirty(old_ip); |
1278 | |
1279 | new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); |
1280 | mark_inode_dirty(new_dir); |
1281 | |
1282 | /* Build list of inodes modified by this transaction */ |
1283 | ipcount = 0; |
1284 | iplist[ipcount++] = old_ip; |
1285 | if (new_ip) |
1286 | iplist[ipcount++] = new_ip; |
1287 | iplist[ipcount++] = old_dir; |
1288 | |
1289 | if (old_dir != new_dir) { |
1290 | iplist[ipcount++] = new_dir; |
1291 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; |
1292 | mark_inode_dirty(old_dir); |
1293 | } |
1294 | |
1295 | /* |
1296 | * Incomplete truncate of file data can |
1297 | * result in timing problems unless we synchronously commit the |
1298 | * transaction. |
1299 | */ |
1300 | if (new_size) |
1301 | commit_flag = COMMIT_SYNC; |
1302 | else |
1303 | commit_flag = 0; |
1304 | |
1305 | rc = txCommit(tid, ipcount, iplist, commit_flag); |
1306 | |
1307 | out4: |
1308 | txEnd(tid); |
1309 | if (new_ip) |
1310 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1311 | if (old_dir != new_dir) |
1312 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); |
1313 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); |
1314 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); |
1315 | |
1316 | while (new_size && (rc == 0)) { |
1317 | tid = txBegin(new_ip->i_sb, 0); |
1318 | mutex_lock(&JFS_IP(new_ip)->commit_mutex); |
1319 | new_size = xtTruncate_pmap(tid, new_ip, new_size); |
1320 | if (new_size < 0) { |
1321 | txAbort(tid, 1); |
1322 | rc = new_size; |
1323 | } else |
1324 | rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); |
1325 | txEnd(tid); |
1326 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1327 | } |
1328 | if (new_ip && (new_ip->i_nlink == 0)) |
1329 | set_cflag(COMMIT_Nolink, new_ip); |
1330 | out3: |
1331 | free_UCSname(&new_dname); |
1332 | out2: |
1333 | free_UCSname(&old_dname); |
1334 | out1: |
1335 | if (new_ip && !S_ISDIR(new_ip->i_mode)) |
1336 | IWRITE_UNLOCK(new_ip); |
1337 | /* |
1338 | * Truncating the directory index table is not guaranteed. It |
1339 | * may need to be done iteratively |
1340 | */ |
1341 | if (test_cflag(COMMIT_Stale, old_dir)) { |
1342 | if (old_dir->i_size > 1) |
1343 | jfs_truncate_nolock(old_dir, 0); |
1344 | |
1345 | clear_cflag(COMMIT_Stale, old_dir); |
1346 | } |
1347 | |
1348 | jfs_info("jfs_rename: returning %d", rc); |
1349 | return rc; |
1350 | } |
1351 | |
1352 | |
1353 | /* |
1354 | * NAME: jfs_mknod |
1355 | * |
1356 | * FUNCTION: Create a special file (device) |
1357 | */ |
1358 | static int jfs_mknod(struct inode *dir, struct dentry *dentry, |
1359 | int mode, dev_t rdev) |
1360 | { |
1361 | struct jfs_inode_info *jfs_ip; |
1362 | struct btstack btstack; |
1363 | struct component_name dname; |
1364 | ino_t ino; |
1365 | struct inode *ip; |
1366 | struct inode *iplist[2]; |
1367 | int rc; |
1368 | tid_t tid; |
1369 | struct tblock *tblk; |
1370 | |
1371 | if (!new_valid_dev(rdev)) |
1372 | return -EINVAL; |
1373 | |
1374 | jfs_info("jfs_mknod: %s", dentry->d_name.name); |
1375 | |
1376 | dquot_initialize(dir); |
1377 | |
1378 | if ((rc = get_UCSname(&dname, dentry))) |
1379 | goto out; |
1380 | |
1381 | ip = ialloc(dir, mode); |
1382 | if (IS_ERR(ip)) { |
1383 | rc = PTR_ERR(ip); |
1384 | goto out1; |
1385 | } |
1386 | jfs_ip = JFS_IP(ip); |
1387 | |
1388 | tid = txBegin(dir->i_sb, 0); |
1389 | |
1390 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
1391 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); |
1392 | |
1393 | rc = jfs_init_acl(tid, ip, dir); |
1394 | if (rc) |
1395 | goto out3; |
1396 | |
1397 | rc = jfs_init_security(tid, ip, dir); |
1398 | if (rc) { |
1399 | txAbort(tid, 0); |
1400 | goto out3; |
1401 | } |
1402 | |
1403 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { |
1404 | txAbort(tid, 0); |
1405 | goto out3; |
1406 | } |
1407 | |
1408 | tblk = tid_to_tblock(tid); |
1409 | tblk->xflag |= COMMIT_CREATE; |
1410 | tblk->ino = ip->i_ino; |
1411 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; |
1412 | |
1413 | ino = ip->i_ino; |
1414 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { |
1415 | txAbort(tid, 0); |
1416 | goto out3; |
1417 | } |
1418 | |
1419 | ip->i_op = &jfs_file_inode_operations; |
1420 | jfs_ip->dev = new_encode_dev(rdev); |
1421 | init_special_inode(ip, ip->i_mode, rdev); |
1422 | |
1423 | mark_inode_dirty(ip); |
1424 | |
1425 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
1426 | |
1427 | mark_inode_dirty(dir); |
1428 | |
1429 | iplist[0] = dir; |
1430 | iplist[1] = ip; |
1431 | rc = txCommit(tid, 2, iplist, 0); |
1432 | |
1433 | out3: |
1434 | txEnd(tid); |
1435 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1436 | mutex_unlock(&JFS_IP(dir)->commit_mutex); |
1437 | if (rc) { |
1438 | free_ea_wmap(ip); |
1439 | ip->i_nlink = 0; |
1440 | unlock_new_inode(ip); |
1441 | iput(ip); |
1442 | } else { |
1443 | d_instantiate(dentry, ip); |
1444 | unlock_new_inode(ip); |
1445 | } |
1446 | |
1447 | out1: |
1448 | free_UCSname(&dname); |
1449 | |
1450 | out: |
1451 | jfs_info("jfs_mknod: returning %d", rc); |
1452 | return rc; |
1453 | } |
1454 | |
1455 | static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) |
1456 | { |
1457 | struct btstack btstack; |
1458 | ino_t inum; |
1459 | struct inode *ip; |
1460 | struct component_name key; |
1461 | const char *name = dentry->d_name.name; |
1462 | int len = dentry->d_name.len; |
1463 | int rc; |
1464 | |
1465 | jfs_info("jfs_lookup: name = %s", name); |
1466 | |
1467 | if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2) |
1468 | dentry->d_op = &jfs_ci_dentry_operations; |
1469 | |
1470 | if ((name[0] == '.') && (len == 1)) |
1471 | inum = dip->i_ino; |
1472 | else if (strcmp(name, "..") == 0) |
1473 | inum = PARENT(dip); |
1474 | else { |
1475 | if ((rc = get_UCSname(&key, dentry))) |
1476 | return ERR_PTR(rc); |
1477 | rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); |
1478 | free_UCSname(&key); |
1479 | if (rc == -ENOENT) { |
1480 | d_add(dentry, NULL); |
1481 | return NULL; |
1482 | } else if (rc) { |
1483 | jfs_err("jfs_lookup: dtSearch returned %d", rc); |
1484 | return ERR_PTR(rc); |
1485 | } |
1486 | } |
1487 | |
1488 | ip = jfs_iget(dip->i_sb, inum); |
1489 | if (IS_ERR(ip)) { |
1490 | jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum); |
1491 | return ERR_CAST(ip); |
1492 | } |
1493 | |
1494 | dentry = d_splice_alias(ip, dentry); |
1495 | |
1496 | if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)) |
1497 | dentry->d_op = &jfs_ci_dentry_operations; |
1498 | |
1499 | return dentry; |
1500 | } |
1501 | |
1502 | static struct inode *jfs_nfs_get_inode(struct super_block *sb, |
1503 | u64 ino, u32 generation) |
1504 | { |
1505 | struct inode *inode; |
1506 | |
1507 | if (ino == 0) |
1508 | return ERR_PTR(-ESTALE); |
1509 | inode = jfs_iget(sb, ino); |
1510 | if (IS_ERR(inode)) |
1511 | return ERR_CAST(inode); |
1512 | |
1513 | if (generation && inode->i_generation != generation) { |
1514 | iput(inode); |
1515 | return ERR_PTR(-ESTALE); |
1516 | } |
1517 | |
1518 | return inode; |
1519 | } |
1520 | |
1521 | struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
1522 | int fh_len, int fh_type) |
1523 | { |
1524 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
1525 | jfs_nfs_get_inode); |
1526 | } |
1527 | |
1528 | struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid, |
1529 | int fh_len, int fh_type) |
1530 | { |
1531 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
1532 | jfs_nfs_get_inode); |
1533 | } |
1534 | |
1535 | struct dentry *jfs_get_parent(struct dentry *dentry) |
1536 | { |
1537 | unsigned long parent_ino; |
1538 | |
1539 | parent_ino = |
1540 | le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot); |
1541 | |
1542 | return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino)); |
1543 | } |
1544 | |
1545 | const struct inode_operations jfs_dir_inode_operations = { |
1546 | .create = jfs_create, |
1547 | .lookup = jfs_lookup, |
1548 | .link = jfs_link, |
1549 | .unlink = jfs_unlink, |
1550 | .symlink = jfs_symlink, |
1551 | .mkdir = jfs_mkdir, |
1552 | .rmdir = jfs_rmdir, |
1553 | .mknod = jfs_mknod, |
1554 | .rename = jfs_rename, |
1555 | .setxattr = jfs_setxattr, |
1556 | .getxattr = jfs_getxattr, |
1557 | .listxattr = jfs_listxattr, |
1558 | .removexattr = jfs_removexattr, |
1559 | .setattr = jfs_setattr, |
1560 | #ifdef CONFIG_JFS_POSIX_ACL |
1561 | .check_acl = jfs_check_acl, |
1562 | #endif |
1563 | }; |
1564 | |
1565 | const struct file_operations jfs_dir_operations = { |
1566 | .read = generic_read_dir, |
1567 | .readdir = jfs_readdir, |
1568 | .fsync = jfs_fsync, |
1569 | .unlocked_ioctl = jfs_ioctl, |
1570 | #ifdef CONFIG_COMPAT |
1571 | .compat_ioctl = jfs_compat_ioctl, |
1572 | #endif |
1573 | .llseek = generic_file_llseek, |
1574 | }; |
1575 | |
1576 | static int jfs_ci_hash(struct dentry *dir, struct qstr *this) |
1577 | { |
1578 | unsigned long hash; |
1579 | int i; |
1580 | |
1581 | hash = init_name_hash(); |
1582 | for (i=0; i < this->len; i++) |
1583 | hash = partial_name_hash(tolower(this->name[i]), hash); |
1584 | this->hash = end_name_hash(hash); |
1585 | |
1586 | return 0; |
1587 | } |
1588 | |
1589 | static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b) |
1590 | { |
1591 | int i, result = 1; |
1592 | |
1593 | if (a->len != b->len) |
1594 | goto out; |
1595 | for (i=0; i < a->len; i++) { |
1596 | if (tolower(a->name[i]) != tolower(b->name[i])) |
1597 | goto out; |
1598 | } |
1599 | result = 0; |
1600 | |
1601 | /* |
1602 | * We want creates to preserve case. A negative dentry, a, that |
1603 | * has a different case than b may cause a new entry to be created |
1604 | * with the wrong case. Since we can't tell if a comes from a negative |
1605 | * dentry, we blindly replace it with b. This should be harmless if |
1606 | * a is not a negative dentry. |
1607 | */ |
1608 | memcpy((unsigned char *)a->name, b->name, a->len); |
1609 | out: |
1610 | return result; |
1611 | } |
1612 | |
1613 | const struct dentry_operations jfs_ci_dentry_operations = |
1614 | { |
1615 | .d_hash = jfs_ci_hash, |
1616 | .d_compare = jfs_ci_compare, |
1617 | }; |
1618 |
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v2.6.34-rc5
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