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1da177e4 LT |
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 "jfs_incore.h" | |
24 | #include "jfs_superblock.h" | |
25 | #include "jfs_inode.h" | |
26 | #include "jfs_dinode.h" | |
27 | #include "jfs_dmap.h" | |
28 | #include "jfs_unicode.h" | |
29 | #include "jfs_metapage.h" | |
30 | #include "jfs_xattr.h" | |
31 | #include "jfs_acl.h" | |
32 | #include "jfs_debug.h" | |
33 | ||
34 | extern struct inode_operations jfs_file_inode_operations; | |
35 | extern struct inode_operations jfs_symlink_inode_operations; | |
36 | extern struct file_operations jfs_file_operations; | |
37 | extern struct address_space_operations jfs_aops; | |
38 | ||
39 | extern int jfs_fsync(struct file *, struct dentry *, int); | |
40 | extern void jfs_truncate_nolock(struct inode *, loff_t); | |
41 | extern int jfs_init_acl(struct inode *, struct inode *); | |
42 | ||
43 | /* | |
44 | * forward references | |
45 | */ | |
46 | struct inode_operations jfs_dir_inode_operations; | |
47 | struct file_operations jfs_dir_operations; | |
48 | struct dentry_operations jfs_ci_dentry_operations; | |
49 | ||
50 | static s64 commitZeroLink(tid_t, struct inode *); | |
51 | ||
52 | /* | |
53 | * NAME: jfs_create(dip, dentry, mode) | |
54 | * | |
55 | * FUNCTION: create a regular file in the parent directory <dip> | |
56 | * with name = <from dentry> and mode = <mode> | |
57 | * | |
58 | * PARAMETER: dip - parent directory vnode | |
59 | * dentry - dentry of new file | |
60 | * mode - create mode (rwxrwxrwx). | |
61 | * nd- nd struct | |
62 | * | |
63 | * RETURN: Errors from subroutines | |
64 | * | |
65 | */ | |
66 | static int jfs_create(struct inode *dip, struct dentry *dentry, int mode, | |
67 | struct nameidata *nd) | |
68 | { | |
69 | int rc = 0; | |
70 | tid_t tid; /* transaction id */ | |
71 | struct inode *ip = NULL; /* child directory inode */ | |
72 | ino_t ino; | |
73 | struct component_name dname; /* child directory name */ | |
74 | struct btstack btstack; | |
75 | struct inode *iplist[2]; | |
76 | struct tblock *tblk; | |
77 | ||
78 | jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name); | |
79 | ||
80 | /* | |
81 | * search parent directory for entry/freespace | |
82 | * (dtSearch() returns parent directory page pinned) | |
83 | */ | |
84 | if ((rc = get_UCSname(&dname, dentry))) | |
85 | goto out1; | |
86 | ||
87 | /* | |
88 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
89 | * block there while holding dtree page, so we allocate the inode & | |
90 | * begin the transaction before we search the directory. | |
91 | */ | |
92 | ip = ialloc(dip, mode); | |
93 | if (ip == NULL) { | |
94 | rc = -ENOSPC; | |
95 | goto out2; | |
96 | } | |
97 | ||
98 | tid = txBegin(dip->i_sb, 0); | |
99 | ||
100 | down(&JFS_IP(dip)->commit_sem); | |
101 | down(&JFS_IP(ip)->commit_sem); | |
102 | ||
103 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { | |
104 | jfs_err("jfs_create: dtSearch returned %d", rc); | |
105 | goto out3; | |
106 | } | |
107 | ||
108 | tblk = tid_to_tblock(tid); | |
109 | tblk->xflag |= COMMIT_CREATE; | |
110 | tblk->ino = ip->i_ino; | |
111 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
112 | ||
113 | iplist[0] = dip; | |
114 | iplist[1] = ip; | |
115 | ||
116 | /* | |
117 | * initialize the child XAD tree root in-line in inode | |
118 | */ | |
119 | xtInitRoot(tid, ip); | |
120 | ||
121 | /* | |
122 | * create entry in parent directory for child directory | |
123 | * (dtInsert() releases parent directory page) | |
124 | */ | |
125 | ino = ip->i_ino; | |
126 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
127 | if (rc == -EIO) { | |
128 | jfs_err("jfs_create: dtInsert returned -EIO"); | |
129 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
130 | } else | |
131 | txAbort(tid, 0); /* Filesystem full */ | |
132 | goto out3; | |
133 | } | |
134 | ||
135 | ip->i_op = &jfs_file_inode_operations; | |
136 | ip->i_fop = &jfs_file_operations; | |
137 | ip->i_mapping->a_ops = &jfs_aops; | |
138 | ||
139 | insert_inode_hash(ip); | |
140 | mark_inode_dirty(ip); | |
141 | ||
142 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; | |
143 | ||
144 | mark_inode_dirty(dip); | |
145 | ||
146 | rc = txCommit(tid, 2, &iplist[0], 0); | |
147 | ||
148 | out3: | |
149 | txEnd(tid); | |
150 | up(&JFS_IP(dip)->commit_sem); | |
151 | up(&JFS_IP(ip)->commit_sem); | |
152 | if (rc) { | |
153 | ip->i_nlink = 0; | |
154 | iput(ip); | |
155 | } else | |
156 | d_instantiate(dentry, ip); | |
157 | ||
158 | out2: | |
159 | free_UCSname(&dname); | |
160 | ||
161 | #ifdef CONFIG_JFS_POSIX_ACL | |
162 | if (rc == 0) | |
163 | jfs_init_acl(ip, dip); | |
164 | #endif | |
165 | ||
166 | out1: | |
167 | ||
168 | jfs_info("jfs_create: rc:%d", rc); | |
169 | return rc; | |
170 | } | |
171 | ||
172 | ||
173 | /* | |
174 | * NAME: jfs_mkdir(dip, dentry, mode) | |
175 | * | |
176 | * FUNCTION: create a child directory in the parent directory <dip> | |
177 | * with name = <from dentry> and mode = <mode> | |
178 | * | |
179 | * PARAMETER: dip - parent directory vnode | |
180 | * dentry - dentry of child directory | |
181 | * mode - create mode (rwxrwxrwx). | |
182 | * | |
183 | * RETURN: Errors from subroutines | |
184 | * | |
185 | * note: | |
186 | * EACCESS: user needs search+write permission on the parent directory | |
187 | */ | |
188 | static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode) | |
189 | { | |
190 | int rc = 0; | |
191 | tid_t tid; /* transaction id */ | |
192 | struct inode *ip = NULL; /* child directory inode */ | |
193 | ino_t ino; | |
194 | struct component_name dname; /* child directory name */ | |
195 | struct btstack btstack; | |
196 | struct inode *iplist[2]; | |
197 | struct tblock *tblk; | |
198 | ||
199 | jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name); | |
200 | ||
201 | /* link count overflow on parent directory ? */ | |
202 | if (dip->i_nlink == JFS_LINK_MAX) { | |
203 | rc = -EMLINK; | |
204 | goto out1; | |
205 | } | |
206 | ||
207 | /* | |
208 | * search parent directory for entry/freespace | |
209 | * (dtSearch() returns parent directory page pinned) | |
210 | */ | |
211 | if ((rc = get_UCSname(&dname, dentry))) | |
212 | goto out1; | |
213 | ||
214 | /* | |
215 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
216 | * block there while holding dtree page, so we allocate the inode & | |
217 | * begin the transaction before we search the directory. | |
218 | */ | |
219 | ip = ialloc(dip, S_IFDIR | mode); | |
220 | if (ip == NULL) { | |
221 | rc = -ENOSPC; | |
222 | goto out2; | |
223 | } | |
224 | ||
225 | tid = txBegin(dip->i_sb, 0); | |
226 | ||
227 | down(&JFS_IP(dip)->commit_sem); | |
228 | down(&JFS_IP(ip)->commit_sem); | |
229 | ||
230 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { | |
231 | jfs_err("jfs_mkdir: dtSearch returned %d", rc); | |
232 | goto out3; | |
233 | } | |
234 | ||
235 | tblk = tid_to_tblock(tid); | |
236 | tblk->xflag |= COMMIT_CREATE; | |
237 | tblk->ino = ip->i_ino; | |
238 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
239 | ||
240 | iplist[0] = dip; | |
241 | iplist[1] = ip; | |
242 | ||
243 | /* | |
244 | * initialize the child directory in-line in inode | |
245 | */ | |
246 | dtInitRoot(tid, ip, dip->i_ino); | |
247 | ||
248 | /* | |
249 | * create entry in parent directory for child directory | |
250 | * (dtInsert() releases parent directory page) | |
251 | */ | |
252 | ino = ip->i_ino; | |
253 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
254 | if (rc == -EIO) { | |
255 | jfs_err("jfs_mkdir: dtInsert returned -EIO"); | |
256 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
257 | } else | |
258 | txAbort(tid, 0); /* Filesystem full */ | |
259 | goto out3; | |
260 | } | |
261 | ||
262 | ip->i_nlink = 2; /* for '.' */ | |
263 | ip->i_op = &jfs_dir_inode_operations; | |
264 | ip->i_fop = &jfs_dir_operations; | |
265 | ||
266 | insert_inode_hash(ip); | |
267 | mark_inode_dirty(ip); | |
268 | ||
269 | /* update parent directory inode */ | |
270 | dip->i_nlink++; /* for '..' from child directory */ | |
271 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; | |
272 | mark_inode_dirty(dip); | |
273 | ||
274 | rc = txCommit(tid, 2, &iplist[0], 0); | |
275 | ||
276 | out3: | |
277 | txEnd(tid); | |
278 | up(&JFS_IP(dip)->commit_sem); | |
279 | up(&JFS_IP(ip)->commit_sem); | |
280 | if (rc) { | |
281 | ip->i_nlink = 0; | |
282 | iput(ip); | |
283 | } else | |
284 | d_instantiate(dentry, ip); | |
285 | ||
286 | out2: | |
287 | free_UCSname(&dname); | |
288 | ||
289 | #ifdef CONFIG_JFS_POSIX_ACL | |
290 | if (rc == 0) | |
291 | jfs_init_acl(ip, dip); | |
292 | #endif | |
293 | ||
294 | out1: | |
295 | ||
296 | jfs_info("jfs_mkdir: rc:%d", rc); | |
297 | return rc; | |
298 | } | |
299 | ||
300 | /* | |
301 | * NAME: jfs_rmdir(dip, dentry) | |
302 | * | |
303 | * FUNCTION: remove a link to child directory | |
304 | * | |
305 | * PARAMETER: dip - parent inode | |
306 | * dentry - child directory dentry | |
307 | * | |
308 | * RETURN: -EINVAL - if name is . or .. | |
309 | * -EINVAL - if . or .. exist but are invalid. | |
310 | * errors from subroutines | |
311 | * | |
312 | * note: | |
313 | * if other threads have the directory open when the last link | |
314 | * is removed, the "." and ".." entries, if present, are removed before | |
315 | * rmdir() returns and no new entries may be created in the directory, | |
316 | * but the directory is not removed until the last reference to | |
317 | * the directory is released (cf.unlink() of regular file). | |
318 | */ | |
319 | static int jfs_rmdir(struct inode *dip, struct dentry *dentry) | |
320 | { | |
321 | int rc; | |
322 | tid_t tid; /* transaction id */ | |
323 | struct inode *ip = dentry->d_inode; | |
324 | ino_t ino; | |
325 | struct component_name dname; | |
326 | struct inode *iplist[2]; | |
327 | struct tblock *tblk; | |
328 | ||
329 | jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name); | |
330 | ||
331 | /* Init inode for quota operations. */ | |
332 | DQUOT_INIT(ip); | |
333 | ||
334 | /* directory must be empty to be removed */ | |
335 | if (!dtEmpty(ip)) { | |
336 | rc = -ENOTEMPTY; | |
337 | goto out; | |
338 | } | |
339 | ||
340 | if ((rc = get_UCSname(&dname, dentry))) { | |
341 | goto out; | |
342 | } | |
343 | ||
344 | tid = txBegin(dip->i_sb, 0); | |
345 | ||
346 | down(&JFS_IP(dip)->commit_sem); | |
347 | down(&JFS_IP(ip)->commit_sem); | |
348 | ||
349 | iplist[0] = dip; | |
350 | iplist[1] = ip; | |
351 | ||
352 | tblk = tid_to_tblock(tid); | |
353 | tblk->xflag |= COMMIT_DELETE; | |
354 | tblk->u.ip = ip; | |
355 | ||
356 | /* | |
357 | * delete the entry of target directory from parent directory | |
358 | */ | |
359 | ino = ip->i_ino; | |
360 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
361 | jfs_err("jfs_rmdir: dtDelete returned %d", rc); | |
362 | if (rc == -EIO) | |
363 | txAbort(tid, 1); | |
364 | txEnd(tid); | |
365 | up(&JFS_IP(dip)->commit_sem); | |
366 | up(&JFS_IP(ip)->commit_sem); | |
367 | ||
368 | goto out2; | |
369 | } | |
370 | ||
371 | /* update parent directory's link count corresponding | |
372 | * to ".." entry of the target directory deleted | |
373 | */ | |
374 | dip->i_nlink--; | |
375 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; | |
376 | mark_inode_dirty(dip); | |
377 | ||
378 | /* | |
379 | * OS/2 could have created EA and/or ACL | |
380 | */ | |
381 | /* free EA from both persistent and working map */ | |
382 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
383 | /* free EA pages */ | |
384 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
385 | } | |
386 | JFS_IP(ip)->ea.flag = 0; | |
387 | ||
388 | /* free ACL from both persistent and working map */ | |
389 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
390 | /* free ACL pages */ | |
391 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
392 | } | |
393 | JFS_IP(ip)->acl.flag = 0; | |
394 | ||
395 | /* mark the target directory as deleted */ | |
396 | ip->i_nlink = 0; | |
397 | mark_inode_dirty(ip); | |
398 | ||
399 | rc = txCommit(tid, 2, &iplist[0], 0); | |
400 | ||
401 | txEnd(tid); | |
402 | ||
403 | up(&JFS_IP(dip)->commit_sem); | |
404 | up(&JFS_IP(ip)->commit_sem); | |
405 | ||
406 | /* | |
407 | * Truncating the directory index table is not guaranteed. It | |
408 | * may need to be done iteratively | |
409 | */ | |
410 | if (test_cflag(COMMIT_Stale, dip)) { | |
411 | if (dip->i_size > 1) | |
412 | jfs_truncate_nolock(dip, 0); | |
413 | ||
414 | clear_cflag(COMMIT_Stale, dip); | |
415 | } | |
416 | ||
417 | out2: | |
418 | free_UCSname(&dname); | |
419 | ||
420 | out: | |
421 | jfs_info("jfs_rmdir: rc:%d", rc); | |
422 | return rc; | |
423 | } | |
424 | ||
425 | /* | |
426 | * NAME: jfs_unlink(dip, dentry) | |
427 | * | |
428 | * FUNCTION: remove a link to object <vp> named by <name> | |
429 | * from parent directory <dvp> | |
430 | * | |
431 | * PARAMETER: dip - inode of parent directory | |
432 | * dentry - dentry of object to be removed | |
433 | * | |
434 | * RETURN: errors from subroutines | |
435 | * | |
436 | * note: | |
437 | * temporary file: if one or more processes have the file open | |
438 | * when the last link is removed, the link will be removed before | |
439 | * unlink() returns, but the removal of the file contents will be | |
440 | * postponed until all references to the files are closed. | |
441 | * | |
442 | * JFS does NOT support unlink() on directories. | |
443 | * | |
444 | */ | |
445 | static int jfs_unlink(struct inode *dip, struct dentry *dentry) | |
446 | { | |
447 | int rc; | |
448 | tid_t tid; /* transaction id */ | |
449 | struct inode *ip = dentry->d_inode; | |
450 | ino_t ino; | |
451 | struct component_name dname; /* object name */ | |
452 | struct inode *iplist[2]; | |
453 | struct tblock *tblk; | |
454 | s64 new_size = 0; | |
455 | int commit_flag; | |
456 | ||
457 | jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name); | |
458 | ||
459 | /* Init inode for quota operations. */ | |
460 | DQUOT_INIT(ip); | |
461 | ||
462 | if ((rc = get_UCSname(&dname, dentry))) | |
463 | goto out; | |
464 | ||
465 | IWRITE_LOCK(ip); | |
466 | ||
467 | tid = txBegin(dip->i_sb, 0); | |
468 | ||
469 | down(&JFS_IP(dip)->commit_sem); | |
470 | down(&JFS_IP(ip)->commit_sem); | |
471 | ||
472 | iplist[0] = dip; | |
473 | iplist[1] = ip; | |
474 | ||
475 | /* | |
476 | * delete the entry of target file from parent directory | |
477 | */ | |
478 | ino = ip->i_ino; | |
479 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
480 | jfs_err("jfs_unlink: dtDelete returned %d", rc); | |
481 | if (rc == -EIO) | |
482 | txAbort(tid, 1); /* Marks FS Dirty */ | |
483 | txEnd(tid); | |
484 | up(&JFS_IP(dip)->commit_sem); | |
485 | up(&JFS_IP(ip)->commit_sem); | |
486 | IWRITE_UNLOCK(ip); | |
487 | goto out1; | |
488 | } | |
489 | ||
490 | ASSERT(ip->i_nlink); | |
491 | ||
492 | ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME; | |
493 | mark_inode_dirty(dip); | |
494 | ||
495 | /* update target's inode */ | |
496 | ip->i_nlink--; | |
497 | mark_inode_dirty(ip); | |
498 | ||
499 | /* | |
500 | * commit zero link count object | |
501 | */ | |
502 | if (ip->i_nlink == 0) { | |
503 | assert(!test_cflag(COMMIT_Nolink, ip)); | |
504 | /* free block resources */ | |
505 | if ((new_size = commitZeroLink(tid, ip)) < 0) { | |
506 | txAbort(tid, 1); /* Marks FS Dirty */ | |
507 | txEnd(tid); | |
508 | up(&JFS_IP(dip)->commit_sem); | |
509 | up(&JFS_IP(ip)->commit_sem); | |
510 | IWRITE_UNLOCK(ip); | |
511 | rc = new_size; | |
512 | goto out1; | |
513 | } | |
514 | tblk = tid_to_tblock(tid); | |
515 | tblk->xflag |= COMMIT_DELETE; | |
516 | tblk->u.ip = ip; | |
517 | } | |
518 | ||
519 | /* | |
520 | * Incomplete truncate of file data can | |
521 | * result in timing problems unless we synchronously commit the | |
522 | * transaction. | |
523 | */ | |
524 | if (new_size) | |
525 | commit_flag = COMMIT_SYNC; | |
526 | else | |
527 | commit_flag = 0; | |
528 | ||
529 | /* | |
530 | * If xtTruncate was incomplete, commit synchronously to avoid | |
531 | * timing complications | |
532 | */ | |
533 | rc = txCommit(tid, 2, &iplist[0], commit_flag); | |
534 | ||
535 | txEnd(tid); | |
536 | ||
537 | up(&JFS_IP(dip)->commit_sem); | |
538 | up(&JFS_IP(ip)->commit_sem); | |
539 | ||
540 | ||
541 | while (new_size && (rc == 0)) { | |
542 | tid = txBegin(dip->i_sb, 0); | |
543 | down(&JFS_IP(ip)->commit_sem); | |
544 | new_size = xtTruncate_pmap(tid, ip, new_size); | |
545 | if (new_size < 0) { | |
546 | txAbort(tid, 1); /* Marks FS Dirty */ | |
547 | rc = new_size; | |
548 | } else | |
549 | rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); | |
550 | txEnd(tid); | |
551 | up(&JFS_IP(ip)->commit_sem); | |
552 | } | |
553 | ||
554 | if (ip->i_nlink == 0) | |
555 | set_cflag(COMMIT_Nolink, ip); | |
556 | ||
557 | IWRITE_UNLOCK(ip); | |
558 | ||
559 | /* | |
560 | * Truncating the directory index table is not guaranteed. It | |
561 | * may need to be done iteratively | |
562 | */ | |
563 | if (test_cflag(COMMIT_Stale, dip)) { | |
564 | if (dip->i_size > 1) | |
565 | jfs_truncate_nolock(dip, 0); | |
566 | ||
567 | clear_cflag(COMMIT_Stale, dip); | |
568 | } | |
569 | ||
570 | out1: | |
571 | free_UCSname(&dname); | |
572 | out: | |
573 | jfs_info("jfs_unlink: rc:%d", rc); | |
574 | return rc; | |
575 | } | |
576 | ||
577 | /* | |
578 | * NAME: commitZeroLink() | |
579 | * | |
580 | * FUNCTION: for non-directory, called by jfs_remove(), | |
581 | * truncate a regular file, directory or symbolic | |
582 | * link to zero length. return 0 if type is not | |
583 | * one of these. | |
584 | * | |
585 | * if the file is currently associated with a VM segment | |
586 | * only permanent disk and inode map resources are freed, | |
587 | * and neither the inode nor indirect blocks are modified | |
588 | * so that the resources can be later freed in the work | |
589 | * map by ctrunc1. | |
590 | * if there is no VM segment on entry, the resources are | |
591 | * freed in both work and permanent map. | |
592 | * (? for temporary file - memory object is cached even | |
593 | * after no reference: | |
594 | * reference count > 0 - ) | |
595 | * | |
596 | * PARAMETERS: cd - pointer to commit data structure. | |
597 | * current inode is the one to truncate. | |
598 | * | |
599 | * RETURN: Errors from subroutines | |
600 | */ | |
601 | static s64 commitZeroLink(tid_t tid, struct inode *ip) | |
602 | { | |
603 | int filetype; | |
604 | struct tblock *tblk; | |
605 | ||
606 | jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); | |
607 | ||
608 | filetype = ip->i_mode & S_IFMT; | |
609 | switch (filetype) { | |
610 | case S_IFREG: | |
611 | break; | |
612 | case S_IFLNK: | |
613 | /* fast symbolic link */ | |
614 | if (ip->i_size < IDATASIZE) { | |
615 | ip->i_size = 0; | |
616 | return 0; | |
617 | } | |
618 | break; | |
619 | default: | |
620 | assert(filetype != S_IFDIR); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | set_cflag(COMMIT_Freewmap, ip); | |
625 | ||
626 | /* mark transaction of block map update type */ | |
627 | tblk = tid_to_tblock(tid); | |
628 | tblk->xflag |= COMMIT_PMAP; | |
629 | ||
630 | /* | |
631 | * free EA | |
632 | */ | |
633 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) | |
634 | /* acquire maplock on EA to be freed from block map */ | |
635 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
636 | ||
637 | /* | |
638 | * free ACL | |
639 | */ | |
640 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) | |
641 | /* acquire maplock on EA to be freed from block map */ | |
642 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
643 | ||
644 | /* | |
645 | * free xtree/data (truncate to zero length): | |
646 | * free xtree/data pages from cache if COMMIT_PWMAP, | |
647 | * free xtree/data blocks from persistent block map, and | |
648 | * free xtree/data blocks from working block map if COMMIT_PWMAP; | |
649 | */ | |
650 | if (ip->i_size) | |
651 | return xtTruncate_pmap(tid, ip, 0); | |
652 | ||
653 | return 0; | |
654 | } | |
655 | ||
656 | ||
657 | /* | |
658 | * NAME: freeZeroLink() | |
659 | * | |
660 | * FUNCTION: for non-directory, called by iClose(), | |
661 | * free resources of a file from cache and WORKING map | |
662 | * for a file previously committed with zero link count | |
663 | * while associated with a pager object, | |
664 | * | |
665 | * PARAMETER: ip - pointer to inode of file. | |
666 | * | |
667 | * RETURN: 0 -ok | |
668 | */ | |
669 | int freeZeroLink(struct inode *ip) | |
670 | { | |
671 | int rc = 0; | |
672 | int type; | |
673 | ||
674 | jfs_info("freeZeroLink: ip = 0x%p", ip); | |
675 | ||
676 | /* return if not reg or symbolic link or if size is | |
677 | * already ok. | |
678 | */ | |
679 | type = ip->i_mode & S_IFMT; | |
680 | ||
681 | switch (type) { | |
682 | case S_IFREG: | |
683 | break; | |
684 | case S_IFLNK: | |
685 | /* if its contained in inode nothing to do */ | |
686 | if (ip->i_size < IDATASIZE) | |
687 | return 0; | |
688 | break; | |
689 | default: | |
690 | return 0; | |
691 | } | |
692 | ||
693 | /* | |
694 | * free EA | |
695 | */ | |
696 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
697 | s64 xaddr = addressDXD(&JFS_IP(ip)->ea); | |
698 | int xlen = lengthDXD(&JFS_IP(ip)->ea); | |
699 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
700 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
701 | ||
702 | /* free EA pages from cache */ | |
703 | invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); | |
704 | ||
705 | /* free EA extent from working block map */ | |
706 | maplock.index = 1; | |
707 | pxdlock = (struct pxd_lock *) & maplock; | |
708 | pxdlock->flag = mlckFREEPXD; | |
709 | PXDaddress(&pxdlock->pxd, xaddr); | |
710 | PXDlength(&pxdlock->pxd, xlen); | |
711 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
712 | } | |
713 | ||
714 | /* | |
715 | * free ACL | |
716 | */ | |
717 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
718 | s64 xaddr = addressDXD(&JFS_IP(ip)->acl); | |
719 | int xlen = lengthDXD(&JFS_IP(ip)->acl); | |
720 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
721 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
722 | ||
723 | invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); | |
724 | ||
725 | /* free ACL extent from working block map */ | |
726 | maplock.index = 1; | |
727 | pxdlock = (struct pxd_lock *) & maplock; | |
728 | pxdlock->flag = mlckFREEPXD; | |
729 | PXDaddress(&pxdlock->pxd, xaddr); | |
730 | PXDlength(&pxdlock->pxd, xlen); | |
731 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
732 | } | |
733 | ||
734 | /* | |
735 | * free xtree/data (truncate to zero length): | |
736 | * free xtree/data pages from cache, and | |
737 | * free xtree/data blocks from working block map; | |
738 | */ | |
739 | if (ip->i_size) | |
740 | rc = xtTruncate(0, ip, 0, COMMIT_WMAP); | |
741 | ||
742 | return rc; | |
743 | } | |
744 | ||
745 | /* | |
746 | * NAME: jfs_link(vp, dvp, name, crp) | |
747 | * | |
748 | * FUNCTION: create a link to <vp> by the name = <name> | |
749 | * in the parent directory <dvp> | |
750 | * | |
751 | * PARAMETER: vp - target object | |
752 | * dvp - parent directory of new link | |
753 | * name - name of new link to target object | |
754 | * crp - credential | |
755 | * | |
756 | * RETURN: Errors from subroutines | |
757 | * | |
758 | * note: | |
759 | * JFS does NOT support link() on directories (to prevent circular | |
760 | * path in the directory hierarchy); | |
761 | * EPERM: the target object is a directory, and either the caller | |
762 | * does not have appropriate privileges or the implementation prohibits | |
763 | * using link() on directories [XPG4.2]. | |
764 | * | |
765 | * JFS does NOT support links between file systems: | |
766 | * EXDEV: target object and new link are on different file systems and | |
767 | * implementation does not support links between file systems [XPG4.2]. | |
768 | */ | |
769 | static int jfs_link(struct dentry *old_dentry, | |
770 | struct inode *dir, struct dentry *dentry) | |
771 | { | |
772 | int rc; | |
773 | tid_t tid; | |
774 | struct inode *ip = old_dentry->d_inode; | |
775 | ino_t ino; | |
776 | struct component_name dname; | |
777 | struct btstack btstack; | |
778 | struct inode *iplist[2]; | |
779 | ||
780 | jfs_info("jfs_link: %s %s", old_dentry->d_name.name, | |
781 | dentry->d_name.name); | |
782 | ||
783 | if (ip->i_nlink == JFS_LINK_MAX) | |
784 | return -EMLINK; | |
785 | ||
786 | if (ip->i_nlink == 0) | |
787 | return -ENOENT; | |
788 | ||
789 | tid = txBegin(ip->i_sb, 0); | |
790 | ||
791 | down(&JFS_IP(dir)->commit_sem); | |
792 | down(&JFS_IP(ip)->commit_sem); | |
793 | ||
794 | /* | |
795 | * scan parent directory for entry/freespace | |
796 | */ | |
797 | if ((rc = get_UCSname(&dname, dentry))) | |
798 | goto out; | |
799 | ||
800 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) | |
801 | goto free_dname; | |
802 | ||
803 | /* | |
804 | * create entry for new link in parent directory | |
805 | */ | |
806 | ino = ip->i_ino; | |
807 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) | |
808 | goto free_dname; | |
809 | ||
810 | /* update object inode */ | |
811 | ip->i_nlink++; /* for new link */ | |
812 | ip->i_ctime = CURRENT_TIME; | |
813 | mark_inode_dirty(dir); | |
814 | atomic_inc(&ip->i_count); | |
815 | ||
816 | iplist[0] = ip; | |
817 | iplist[1] = dir; | |
818 | rc = txCommit(tid, 2, &iplist[0], 0); | |
819 | ||
820 | if (rc) { | |
821 | ip->i_nlink--; | |
822 | iput(ip); | |
823 | } else | |
824 | d_instantiate(dentry, ip); | |
825 | ||
826 | free_dname: | |
827 | free_UCSname(&dname); | |
828 | ||
829 | out: | |
830 | txEnd(tid); | |
831 | ||
832 | up(&JFS_IP(dir)->commit_sem); | |
833 | up(&JFS_IP(ip)->commit_sem); | |
834 | ||
835 | jfs_info("jfs_link: rc:%d", rc); | |
836 | return rc; | |
837 | } | |
838 | ||
839 | /* | |
840 | * NAME: jfs_symlink(dip, dentry, name) | |
841 | * | |
842 | * FUNCTION: creates a symbolic link to <symlink> by name <name> | |
843 | * in directory <dip> | |
844 | * | |
845 | * PARAMETER: dip - parent directory vnode | |
846 | * dentry - dentry of symbolic link | |
847 | * name - the path name of the existing object | |
848 | * that will be the source of the link | |
849 | * | |
850 | * RETURN: errors from subroutines | |
851 | * | |
852 | * note: | |
853 | * ENAMETOOLONG: pathname resolution of a symbolic link produced | |
854 | * an intermediate result whose length exceeds PATH_MAX [XPG4.2] | |
855 | */ | |
856 | ||
857 | static int jfs_symlink(struct inode *dip, struct dentry *dentry, | |
858 | const char *name) | |
859 | { | |
860 | int rc; | |
861 | tid_t tid; | |
862 | ino_t ino = 0; | |
863 | struct component_name dname; | |
864 | int ssize; /* source pathname size */ | |
865 | struct btstack btstack; | |
866 | struct inode *ip = dentry->d_inode; | |
867 | unchar *i_fastsymlink; | |
868 | s64 xlen = 0; | |
869 | int bmask = 0, xsize; | |
870 | s64 extent = 0, xaddr; | |
871 | struct metapage *mp; | |
872 | struct super_block *sb; | |
873 | struct tblock *tblk; | |
874 | ||
875 | struct inode *iplist[2]; | |
876 | ||
877 | jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); | |
878 | ||
879 | ssize = strlen(name) + 1; | |
880 | ||
881 | /* | |
882 | * search parent directory for entry/freespace | |
883 | * (dtSearch() returns parent directory page pinned) | |
884 | */ | |
885 | ||
886 | if ((rc = get_UCSname(&dname, dentry))) | |
887 | goto out1; | |
888 | ||
889 | /* | |
890 | * allocate on-disk/in-memory inode for symbolic link: | |
891 | * (iAlloc() returns new, locked inode) | |
892 | */ | |
893 | ip = ialloc(dip, S_IFLNK | 0777); | |
894 | if (ip == NULL) { | |
895 | rc = -ENOSPC; | |
896 | goto out2; | |
897 | } | |
898 | ||
899 | tid = txBegin(dip->i_sb, 0); | |
900 | ||
901 | down(&JFS_IP(dip)->commit_sem); | |
902 | down(&JFS_IP(ip)->commit_sem); | |
903 | ||
904 | tblk = tid_to_tblock(tid); | |
905 | tblk->xflag |= COMMIT_CREATE; | |
906 | tblk->ino = ip->i_ino; | |
907 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
908 | ||
909 | /* fix symlink access permission | |
910 | * (dir_create() ANDs in the u.u_cmask, | |
911 | * but symlinks really need to be 777 access) | |
912 | */ | |
913 | ip->i_mode |= 0777; | |
914 | ||
915 | /* | |
916 | * write symbolic link target path name | |
917 | */ | |
918 | xtInitRoot(tid, ip); | |
919 | ||
920 | /* | |
921 | * write source path name inline in on-disk inode (fast symbolic link) | |
922 | */ | |
923 | ||
924 | if (ssize <= IDATASIZE) { | |
925 | ip->i_op = &jfs_symlink_inode_operations; | |
926 | ||
927 | i_fastsymlink = JFS_IP(ip)->i_inline; | |
928 | memcpy(i_fastsymlink, name, ssize); | |
929 | ip->i_size = ssize - 1; | |
930 | ||
931 | /* | |
932 | * if symlink is > 128 bytes, we don't have the space to | |
933 | * store inline extended attributes | |
934 | */ | |
935 | if (ssize > sizeof (JFS_IP(ip)->i_inline)) | |
936 | JFS_IP(ip)->mode2 &= ~INLINEEA; | |
937 | ||
938 | jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", | |
939 | ssize, name); | |
940 | } | |
941 | /* | |
942 | * write source path name in a single extent | |
943 | */ | |
944 | else { | |
945 | jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); | |
946 | ||
947 | ip->i_op = &page_symlink_inode_operations; | |
948 | ip->i_mapping->a_ops = &jfs_aops; | |
949 | ||
950 | /* | |
951 | * even though the data of symlink object (source | |
952 | * path name) is treated as non-journaled user data, | |
953 | * it is read/written thru buffer cache for performance. | |
954 | */ | |
955 | sb = ip->i_sb; | |
956 | bmask = JFS_SBI(sb)->bsize - 1; | |
957 | xsize = (ssize + bmask) & ~bmask; | |
958 | xaddr = 0; | |
959 | xlen = xsize >> JFS_SBI(sb)->l2bsize; | |
960 | if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { | |
961 | txAbort(tid, 0); | |
962 | rc = -ENOSPC; | |
963 | goto out3; | |
964 | } | |
965 | extent = xaddr; | |
966 | ip->i_size = ssize - 1; | |
967 | while (ssize) { | |
968 | /* This is kind of silly since PATH_MAX == 4K */ | |
969 | int copy_size = min(ssize, PSIZE); | |
970 | ||
971 | mp = get_metapage(ip, xaddr, PSIZE, 1); | |
972 | ||
973 | if (mp == NULL) { | |
974 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
975 | rc = -EIO; | |
976 | txAbort(tid, 0); | |
977 | goto out3; | |
978 | } | |
979 | memcpy(mp->data, name, copy_size); | |
980 | flush_metapage(mp); | |
981 | ssize -= copy_size; | |
982 | name += copy_size; | |
983 | xaddr += JFS_SBI(sb)->nbperpage; | |
984 | } | |
985 | } | |
986 | ||
987 | /* | |
988 | * create entry for symbolic link in parent directory | |
989 | */ | |
990 | rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); | |
991 | if (rc == 0) { | |
992 | ino = ip->i_ino; | |
993 | rc = dtInsert(tid, dip, &dname, &ino, &btstack); | |
994 | } | |
995 | if (rc) { | |
996 | if (xlen) | |
997 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
998 | txAbort(tid, 0); | |
999 | /* discard new inode */ | |
1000 | goto out3; | |
1001 | } | |
1002 | ||
1003 | insert_inode_hash(ip); | |
1004 | mark_inode_dirty(ip); | |
1005 | ||
1006 | /* | |
1007 | * commit update of parent directory and link object | |
1008 | */ | |
1009 | ||
1010 | iplist[0] = dip; | |
1011 | iplist[1] = ip; | |
1012 | rc = txCommit(tid, 2, &iplist[0], 0); | |
1013 | ||
1014 | out3: | |
1015 | txEnd(tid); | |
1016 | up(&JFS_IP(dip)->commit_sem); | |
1017 | up(&JFS_IP(ip)->commit_sem); | |
1018 | if (rc) { | |
1019 | ip->i_nlink = 0; | |
1020 | iput(ip); | |
1021 | } else | |
1022 | d_instantiate(dentry, ip); | |
1023 | ||
1024 | out2: | |
1025 | free_UCSname(&dname); | |
1026 | ||
1027 | #ifdef CONFIG_JFS_POSIX_ACL | |
1028 | if (rc == 0) | |
1029 | jfs_init_acl(ip, dip); | |
1030 | #endif | |
1031 | ||
1032 | out1: | |
1033 | jfs_info("jfs_symlink: rc:%d", rc); | |
1034 | return rc; | |
1035 | } | |
1036 | ||
1037 | ||
1038 | /* | |
1039 | * NAME: jfs_rename | |
1040 | * | |
1041 | * FUNCTION: rename a file or directory | |
1042 | */ | |
1043 | static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1044 | struct inode *new_dir, struct dentry *new_dentry) | |
1045 | { | |
1046 | struct btstack btstack; | |
1047 | ino_t ino; | |
1048 | struct component_name new_dname; | |
1049 | struct inode *new_ip; | |
1050 | struct component_name old_dname; | |
1051 | struct inode *old_ip; | |
1052 | int rc; | |
1053 | tid_t tid; | |
1054 | struct tlock *tlck; | |
1055 | struct dt_lock *dtlck; | |
1056 | struct lv *lv; | |
1057 | int ipcount; | |
1058 | struct inode *iplist[4]; | |
1059 | struct tblock *tblk; | |
1060 | s64 new_size = 0; | |
1061 | int commit_flag; | |
1062 | ||
1063 | ||
1064 | jfs_info("jfs_rename: %s %s", old_dentry->d_name.name, | |
1065 | new_dentry->d_name.name); | |
1066 | ||
1067 | old_ip = old_dentry->d_inode; | |
1068 | new_ip = new_dentry->d_inode; | |
1069 | ||
1070 | if ((rc = get_UCSname(&old_dname, old_dentry))) | |
1071 | goto out1; | |
1072 | ||
1073 | if ((rc = get_UCSname(&new_dname, new_dentry))) | |
1074 | goto out2; | |
1075 | ||
1076 | /* | |
1077 | * Make sure source inode number is what we think it is | |
1078 | */ | |
1079 | rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); | |
1080 | if (rc || (ino != old_ip->i_ino)) { | |
1081 | rc = -ENOENT; | |
1082 | goto out3; | |
1083 | } | |
1084 | ||
1085 | /* | |
1086 | * Make sure dest inode number (if any) is what we think it is | |
1087 | */ | |
1088 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); | |
1089 | if (rc == 0) { | |
1090 | if ((new_ip == 0) || (ino != new_ip->i_ino)) { | |
1091 | rc = -ESTALE; | |
1092 | goto out3; | |
1093 | } | |
1094 | } else if (rc != -ENOENT) | |
1095 | goto out3; | |
1096 | else if (new_ip) { | |
1097 | /* no entry exists, but one was expected */ | |
1098 | rc = -ESTALE; | |
1099 | goto out3; | |
1100 | } | |
1101 | ||
1102 | if (S_ISDIR(old_ip->i_mode)) { | |
1103 | if (new_ip) { | |
1104 | if (!dtEmpty(new_ip)) { | |
1105 | rc = -ENOTEMPTY; | |
1106 | goto out3; | |
1107 | } | |
1108 | } else if ((new_dir != old_dir) && | |
1109 | (new_dir->i_nlink == JFS_LINK_MAX)) { | |
1110 | rc = -EMLINK; | |
1111 | goto out3; | |
1112 | } | |
1113 | } else if (new_ip) { | |
1114 | IWRITE_LOCK(new_ip); | |
1115 | /* Init inode for quota operations. */ | |
1116 | DQUOT_INIT(new_ip); | |
1117 | } | |
1118 | ||
1119 | /* | |
1120 | * The real work starts here | |
1121 | */ | |
1122 | tid = txBegin(new_dir->i_sb, 0); | |
1123 | ||
1124 | down(&JFS_IP(new_dir)->commit_sem); | |
1125 | down(&JFS_IP(old_ip)->commit_sem); | |
1126 | if (old_dir != new_dir) | |
1127 | down(&JFS_IP(old_dir)->commit_sem); | |
1128 | ||
1129 | if (new_ip) { | |
1130 | down(&JFS_IP(new_ip)->commit_sem); | |
1131 | /* | |
1132 | * Change existing directory entry to new inode number | |
1133 | */ | |
1134 | ino = new_ip->i_ino; | |
1135 | rc = dtModify(tid, new_dir, &new_dname, &ino, | |
1136 | old_ip->i_ino, JFS_RENAME); | |
1137 | if (rc) | |
1138 | goto out4; | |
1139 | new_ip->i_nlink--; | |
1140 | if (S_ISDIR(new_ip->i_mode)) { | |
1141 | new_ip->i_nlink--; | |
1142 | if (new_ip->i_nlink) { | |
1143 | up(&JFS_IP(new_dir)->commit_sem); | |
1144 | up(&JFS_IP(old_ip)->commit_sem); | |
1145 | if (old_dir != new_dir) | |
1146 | up(&JFS_IP(old_dir)->commit_sem); | |
1147 | if (!S_ISDIR(old_ip->i_mode) && new_ip) | |
1148 | IWRITE_UNLOCK(new_ip); | |
1149 | jfs_error(new_ip->i_sb, | |
1150 | "jfs_rename: new_ip->i_nlink != 0"); | |
1151 | return -EIO; | |
1152 | } | |
1153 | tblk = tid_to_tblock(tid); | |
1154 | tblk->xflag |= COMMIT_DELETE; | |
1155 | tblk->u.ip = new_ip; | |
1156 | } else if (new_ip->i_nlink == 0) { | |
1157 | assert(!test_cflag(COMMIT_Nolink, new_ip)); | |
1158 | /* free block resources */ | |
1159 | if ((new_size = commitZeroLink(tid, new_ip)) < 0) { | |
1160 | txAbort(tid, 1); /* Marks FS Dirty */ | |
1161 | rc = new_size; | |
1162 | goto out4; | |
1163 | } | |
1164 | tblk = tid_to_tblock(tid); | |
1165 | tblk->xflag |= COMMIT_DELETE; | |
1166 | tblk->u.ip = new_ip; | |
1167 | } else { | |
1168 | new_ip->i_ctime = CURRENT_TIME; | |
1169 | mark_inode_dirty(new_ip); | |
1170 | } | |
1171 | } else { | |
1172 | /* | |
1173 | * Add new directory entry | |
1174 | */ | |
1175 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, | |
1176 | JFS_CREATE); | |
1177 | if (rc) { | |
1178 | jfs_err("jfs_rename didn't expect dtSearch to fail " | |
1179 | "w/rc = %d", rc); | |
1180 | goto out4; | |
1181 | } | |
1182 | ||
1183 | ino = old_ip->i_ino; | |
1184 | rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); | |
1185 | if (rc) { | |
1186 | if (rc == -EIO) | |
1187 | jfs_err("jfs_rename: dtInsert returned -EIO"); | |
1188 | goto out4; | |
1189 | } | |
1190 | if (S_ISDIR(old_ip->i_mode)) | |
1191 | new_dir->i_nlink++; | |
1192 | } | |
1193 | /* | |
1194 | * Remove old directory entry | |
1195 | */ | |
1196 | ||
1197 | ino = old_ip->i_ino; | |
1198 | rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); | |
1199 | if (rc) { | |
1200 | jfs_err("jfs_rename did not expect dtDelete to return rc = %d", | |
1201 | rc); | |
1202 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
1203 | goto out4; | |
1204 | } | |
1205 | if (S_ISDIR(old_ip->i_mode)) { | |
1206 | old_dir->i_nlink--; | |
1207 | if (old_dir != new_dir) { | |
1208 | /* | |
1209 | * Change inode number of parent for moved directory | |
1210 | */ | |
1211 | ||
1212 | JFS_IP(old_ip)->i_dtroot.header.idotdot = | |
1213 | cpu_to_le32(new_dir->i_ino); | |
1214 | ||
1215 | /* Linelock header of dtree */ | |
1216 | tlck = txLock(tid, old_ip, | |
1217 | (struct metapage *) &JFS_IP(old_ip)->bxflag, | |
1218 | tlckDTREE | tlckBTROOT | tlckRELINK); | |
1219 | dtlck = (struct dt_lock *) & tlck->lock; | |
1220 | ASSERT(dtlck->index == 0); | |
1221 | lv = & dtlck->lv[0]; | |
1222 | lv->offset = 0; | |
1223 | lv->length = 1; | |
1224 | dtlck->index++; | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | /* | |
1229 | * Update ctime on changed/moved inodes & mark dirty | |
1230 | */ | |
1231 | old_ip->i_ctime = CURRENT_TIME; | |
1232 | mark_inode_dirty(old_ip); | |
1233 | ||
1234 | new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); | |
1235 | mark_inode_dirty(new_dir); | |
1236 | ||
1237 | /* Build list of inodes modified by this transaction */ | |
1238 | ipcount = 0; | |
1239 | iplist[ipcount++] = old_ip; | |
1240 | if (new_ip) | |
1241 | iplist[ipcount++] = new_ip; | |
1242 | iplist[ipcount++] = old_dir; | |
1243 | ||
1244 | if (old_dir != new_dir) { | |
1245 | iplist[ipcount++] = new_dir; | |
1246 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; | |
1247 | mark_inode_dirty(old_dir); | |
1248 | } | |
1249 | ||
1250 | /* | |
1251 | * Incomplete truncate of file data can | |
1252 | * result in timing problems unless we synchronously commit the | |
1253 | * transaction. | |
1254 | */ | |
1255 | if (new_size) | |
1256 | commit_flag = COMMIT_SYNC; | |
1257 | else | |
1258 | commit_flag = 0; | |
1259 | ||
1260 | rc = txCommit(tid, ipcount, iplist, commit_flag); | |
1261 | ||
1262 | out4: | |
1263 | txEnd(tid); | |
1264 | ||
1265 | up(&JFS_IP(new_dir)->commit_sem); | |
1266 | up(&JFS_IP(old_ip)->commit_sem); | |
1267 | if (old_dir != new_dir) | |
1268 | up(&JFS_IP(old_dir)->commit_sem); | |
1269 | if (new_ip) | |
1270 | up(&JFS_IP(new_ip)->commit_sem); | |
1271 | ||
1272 | while (new_size && (rc == 0)) { | |
1273 | tid = txBegin(new_ip->i_sb, 0); | |
1274 | down(&JFS_IP(new_ip)->commit_sem); | |
1275 | new_size = xtTruncate_pmap(tid, new_ip, new_size); | |
1276 | if (new_size < 0) { | |
1277 | txAbort(tid, 1); | |
1278 | rc = new_size; | |
1279 | } else | |
1280 | rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); | |
1281 | txEnd(tid); | |
1282 | up(&JFS_IP(new_ip)->commit_sem); | |
1283 | } | |
1284 | if (new_ip && (new_ip->i_nlink == 0)) | |
1285 | set_cflag(COMMIT_Nolink, new_ip); | |
1286 | out3: | |
1287 | free_UCSname(&new_dname); | |
1288 | out2: | |
1289 | free_UCSname(&old_dname); | |
1290 | out1: | |
1291 | if (new_ip && !S_ISDIR(new_ip->i_mode)) | |
1292 | IWRITE_UNLOCK(new_ip); | |
1293 | /* | |
1294 | * Truncating the directory index table is not guaranteed. It | |
1295 | * may need to be done iteratively | |
1296 | */ | |
1297 | if (test_cflag(COMMIT_Stale, old_dir)) { | |
1298 | if (old_dir->i_size > 1) | |
1299 | jfs_truncate_nolock(old_dir, 0); | |
1300 | ||
1301 | clear_cflag(COMMIT_Stale, old_dir); | |
1302 | } | |
1303 | ||
1304 | jfs_info("jfs_rename: returning %d", rc); | |
1305 | return rc; | |
1306 | } | |
1307 | ||
1308 | ||
1309 | /* | |
1310 | * NAME: jfs_mknod | |
1311 | * | |
1312 | * FUNCTION: Create a special file (device) | |
1313 | */ | |
1314 | static int jfs_mknod(struct inode *dir, struct dentry *dentry, | |
1315 | int mode, dev_t rdev) | |
1316 | { | |
1317 | struct jfs_inode_info *jfs_ip; | |
1318 | struct btstack btstack; | |
1319 | struct component_name dname; | |
1320 | ino_t ino; | |
1321 | struct inode *ip; | |
1322 | struct inode *iplist[2]; | |
1323 | int rc; | |
1324 | tid_t tid; | |
1325 | struct tblock *tblk; | |
1326 | ||
1327 | if (!new_valid_dev(rdev)) | |
1328 | return -EINVAL; | |
1329 | ||
1330 | jfs_info("jfs_mknod: %s", dentry->d_name.name); | |
1331 | ||
1332 | if ((rc = get_UCSname(&dname, dentry))) | |
1333 | goto out; | |
1334 | ||
1335 | ip = ialloc(dir, mode); | |
1336 | if (ip == NULL) { | |
1337 | rc = -ENOSPC; | |
1338 | goto out1; | |
1339 | } | |
1340 | jfs_ip = JFS_IP(ip); | |
1341 | ||
1342 | tid = txBegin(dir->i_sb, 0); | |
1343 | ||
1344 | down(&JFS_IP(dir)->commit_sem); | |
1345 | down(&JFS_IP(ip)->commit_sem); | |
1346 | ||
1347 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) | |
1348 | goto out3; | |
1349 | ||
1350 | tblk = tid_to_tblock(tid); | |
1351 | tblk->xflag |= COMMIT_CREATE; | |
1352 | tblk->ino = ip->i_ino; | |
1353 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
1354 | ||
1355 | ino = ip->i_ino; | |
1356 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) | |
1357 | goto out3; | |
1358 | ||
1359 | ip->i_op = &jfs_file_inode_operations; | |
1360 | jfs_ip->dev = new_encode_dev(rdev); | |
1361 | init_special_inode(ip, ip->i_mode, rdev); | |
1362 | ||
1363 | insert_inode_hash(ip); | |
1364 | mark_inode_dirty(ip); | |
1365 | ||
1366 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
1367 | ||
1368 | mark_inode_dirty(dir); | |
1369 | ||
1370 | iplist[0] = dir; | |
1371 | iplist[1] = ip; | |
1372 | rc = txCommit(tid, 2, iplist, 0); | |
1373 | ||
1374 | out3: | |
1375 | txEnd(tid); | |
1376 | up(&JFS_IP(ip)->commit_sem); | |
1377 | up(&JFS_IP(dir)->commit_sem); | |
1378 | if (rc) { | |
1379 | ip->i_nlink = 0; | |
1380 | iput(ip); | |
1381 | } else | |
1382 | d_instantiate(dentry, ip); | |
1383 | ||
1384 | out1: | |
1385 | free_UCSname(&dname); | |
1386 | ||
1387 | #ifdef CONFIG_JFS_POSIX_ACL | |
1388 | if (rc == 0) | |
1389 | jfs_init_acl(ip, dir); | |
1390 | #endif | |
1391 | ||
1392 | out: | |
1393 | jfs_info("jfs_mknod: returning %d", rc); | |
1394 | return rc; | |
1395 | } | |
1396 | ||
1397 | static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) | |
1398 | { | |
1399 | struct btstack btstack; | |
1400 | ino_t inum; | |
1401 | struct inode *ip; | |
1402 | struct component_name key; | |
1403 | const char *name = dentry->d_name.name; | |
1404 | int len = dentry->d_name.len; | |
1405 | int rc; | |
1406 | ||
1407 | jfs_info("jfs_lookup: name = %s", name); | |
1408 | ||
1409 | ||
1410 | if ((name[0] == '.') && (len == 1)) | |
1411 | inum = dip->i_ino; | |
1412 | else if (strcmp(name, "..") == 0) | |
1413 | inum = PARENT(dip); | |
1414 | else { | |
1415 | if ((rc = get_UCSname(&key, dentry))) | |
1416 | return ERR_PTR(rc); | |
1417 | rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); | |
1418 | free_UCSname(&key); | |
1419 | if (rc == -ENOENT) { | |
1420 | d_add(dentry, NULL); | |
1421 | return ERR_PTR(0); | |
1422 | } else if (rc) { | |
1423 | jfs_err("jfs_lookup: dtSearch returned %d", rc); | |
1424 | return ERR_PTR(rc); | |
1425 | } | |
1426 | } | |
1427 | ||
1428 | ip = iget(dip->i_sb, inum); | |
1429 | if (ip == NULL || is_bad_inode(ip)) { | |
1430 | jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum); | |
1431 | if (ip) | |
1432 | iput(ip); | |
1433 | return ERR_PTR(-EACCES); | |
1434 | } | |
1435 | ||
1436 | if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2) | |
1437 | dentry->d_op = &jfs_ci_dentry_operations; | |
1438 | ||
1439 | dentry = d_splice_alias(ip, dentry); | |
1440 | ||
1441 | if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)) | |
1442 | dentry->d_op = &jfs_ci_dentry_operations; | |
1443 | ||
1444 | return dentry; | |
1445 | } | |
1446 | ||
1447 | struct dentry *jfs_get_parent(struct dentry *dentry) | |
1448 | { | |
1449 | struct super_block *sb = dentry->d_inode->i_sb; | |
1450 | struct dentry *parent = ERR_PTR(-ENOENT); | |
1451 | struct inode *inode; | |
1452 | unsigned long parent_ino; | |
1453 | ||
1454 | parent_ino = | |
1455 | le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot); | |
1456 | inode = iget(sb, parent_ino); | |
1457 | if (inode) { | |
1458 | if (is_bad_inode(inode)) { | |
1459 | iput(inode); | |
1460 | parent = ERR_PTR(-EACCES); | |
1461 | } else { | |
1462 | parent = d_alloc_anon(inode); | |
1463 | if (!parent) { | |
1464 | parent = ERR_PTR(-ENOMEM); | |
1465 | iput(inode); | |
1466 | } | |
1467 | } | |
1468 | } | |
1469 | ||
1470 | return parent; | |
1471 | } | |
1472 | ||
1473 | struct inode_operations jfs_dir_inode_operations = { | |
1474 | .create = jfs_create, | |
1475 | .lookup = jfs_lookup, | |
1476 | .link = jfs_link, | |
1477 | .unlink = jfs_unlink, | |
1478 | .symlink = jfs_symlink, | |
1479 | .mkdir = jfs_mkdir, | |
1480 | .rmdir = jfs_rmdir, | |
1481 | .mknod = jfs_mknod, | |
1482 | .rename = jfs_rename, | |
1483 | .setxattr = jfs_setxattr, | |
1484 | .getxattr = jfs_getxattr, | |
1485 | .listxattr = jfs_listxattr, | |
1486 | .removexattr = jfs_removexattr, | |
1487 | #ifdef CONFIG_JFS_POSIX_ACL | |
1488 | .setattr = jfs_setattr, | |
1489 | .permission = jfs_permission, | |
1490 | #endif | |
1491 | }; | |
1492 | ||
1493 | struct file_operations jfs_dir_operations = { | |
1494 | .read = generic_read_dir, | |
1495 | .readdir = jfs_readdir, | |
1496 | .fsync = jfs_fsync, | |
1497 | }; | |
1498 | ||
1499 | static int jfs_ci_hash(struct dentry *dir, struct qstr *this) | |
1500 | { | |
1501 | unsigned long hash; | |
1502 | int i; | |
1503 | ||
1504 | hash = init_name_hash(); | |
1505 | for (i=0; i < this->len; i++) | |
1506 | hash = partial_name_hash(tolower(this->name[i]), hash); | |
1507 | this->hash = end_name_hash(hash); | |
1508 | ||
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b) | |
1513 | { | |
1514 | int i, result = 1; | |
1515 | ||
1516 | if (a->len != b->len) | |
1517 | goto out; | |
1518 | for (i=0; i < a->len; i++) { | |
1519 | if (tolower(a->name[i]) != tolower(b->name[i])) | |
1520 | goto out; | |
1521 | } | |
1522 | result = 0; | |
1523 | ||
1524 | /* | |
1525 | * We want creates to preserve case. A negative dentry, a, that | |
1526 | * has a different case than b may cause a new entry to be created | |
1527 | * with the wrong case. Since we can't tell if a comes from a negative | |
1528 | * dentry, we blindly replace it with b. This should be harmless if | |
1529 | * a is not a negative dentry. | |
1530 | */ | |
1531 | memcpy((unsigned char *)a->name, b->name, a->len); | |
1532 | out: | |
1533 | return result; | |
1534 | } | |
1535 | ||
1536 | struct dentry_operations jfs_ci_dentry_operations = | |
1537 | { | |
1538 | .d_hash = jfs_ci_hash, | |
1539 | .d_compare = jfs_ci_compare, | |
1540 | }; |