]>
Commit | Line | Data |
---|---|---|
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 | |
63f83c9f | 7 | * the Free Software Foundation; either version 2 of the License, or |
1da177e4 | 8 | * (at your option) any later version. |
63f83c9f | 9 | * |
1da177e4 LT |
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 | |
63f83c9f | 16 | * along with this program; if not, write to the Free Software |
1da177e4 LT |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ | |
19 | ||
20 | #include <linux/fs.h> | |
2bc334dc | 21 | #include <linux/namei.h> |
1da177e4 LT |
22 | #include <linux/ctype.h> |
23 | #include <linux/quotaops.h> | |
d425de70 | 24 | #include <linux/exportfs.h> |
1da177e4 LT |
25 | #include "jfs_incore.h" |
26 | #include "jfs_superblock.h" | |
27 | #include "jfs_inode.h" | |
28 | #include "jfs_dinode.h" | |
29 | #include "jfs_dmap.h" | |
30 | #include "jfs_unicode.h" | |
31 | #include "jfs_metapage.h" | |
32 | #include "jfs_xattr.h" | |
33 | #include "jfs_acl.h" | |
34 | #include "jfs_debug.h" | |
35 | ||
1da177e4 LT |
36 | /* |
37 | * forward references | |
38 | */ | |
ad28b4ef | 39 | const struct dentry_operations jfs_ci_dentry_operations; |
1da177e4 LT |
40 | |
41 | static s64 commitZeroLink(tid_t, struct inode *); | |
42 | ||
4f4b401b DK |
43 | /* |
44 | * NAME: free_ea_wmap(inode) | |
45 | * | |
63f83c9f | 46 | * FUNCTION: free uncommitted extended attributes from working map |
4f4b401b DK |
47 | * |
48 | */ | |
49 | static inline void free_ea_wmap(struct inode *inode) | |
50 | { | |
51 | dxd_t *ea = &JFS_IP(inode)->ea; | |
52 | ||
53 | if (ea->flag & DXD_EXTENT) { | |
54 | /* free EA pages from cache */ | |
55 | invalidate_dxd_metapages(inode, *ea); | |
56 | dbFree(inode, addressDXD(ea), lengthDXD(ea)); | |
57 | } | |
58 | ea->flag = 0; | |
59 | } | |
60 | ||
1da177e4 LT |
61 | /* |
62 | * NAME: jfs_create(dip, dentry, mode) | |
63 | * | |
64 | * FUNCTION: create a regular file in the parent directory <dip> | |
65 | * with name = <from dentry> and mode = <mode> | |
66 | * | |
63f83c9f | 67 | * PARAMETER: dip - parent directory vnode |
1da177e4 LT |
68 | * dentry - dentry of new file |
69 | * mode - create mode (rwxrwxrwx). | |
70 | * nd- nd struct | |
71 | * | |
72 | * RETURN: Errors from subroutines | |
73 | * | |
74 | */ | |
75 | static int jfs_create(struct inode *dip, struct dentry *dentry, int mode, | |
76 | struct nameidata *nd) | |
77 | { | |
78 | int rc = 0; | |
79 | tid_t tid; /* transaction id */ | |
80 | struct inode *ip = NULL; /* child directory inode */ | |
81 | ino_t ino; | |
82 | struct component_name dname; /* child directory name */ | |
83 | struct btstack btstack; | |
84 | struct inode *iplist[2]; | |
85 | struct tblock *tblk; | |
86 | ||
87 | jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name); | |
88 | ||
871a2931 | 89 | dquot_initialize(dip); |
907f4554 | 90 | |
1da177e4 LT |
91 | /* |
92 | * search parent directory for entry/freespace | |
93 | * (dtSearch() returns parent directory page pinned) | |
94 | */ | |
95 | if ((rc = get_UCSname(&dname, dentry))) | |
96 | goto out1; | |
97 | ||
98 | /* | |
99 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
100 | * block there while holding dtree page, so we allocate the inode & | |
101 | * begin the transaction before we search the directory. | |
102 | */ | |
103 | ip = ialloc(dip, mode); | |
087387f9 AM |
104 | if (IS_ERR(ip)) { |
105 | rc = PTR_ERR(ip); | |
1da177e4 LT |
106 | goto out2; |
107 | } | |
108 | ||
109 | tid = txBegin(dip->i_sb, 0); | |
110 | ||
82d5b9a7 DK |
111 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
112 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 113 | |
4f4b401b DK |
114 | rc = jfs_init_acl(tid, ip, dip); |
115 | if (rc) | |
116 | goto out3; | |
117 | ||
1d15b10f DK |
118 | rc = jfs_init_security(tid, ip, dip); |
119 | if (rc) { | |
120 | txAbort(tid, 0); | |
121 | goto out3; | |
122 | } | |
123 | ||
1da177e4 LT |
124 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
125 | jfs_err("jfs_create: dtSearch returned %d", rc); | |
4f4b401b | 126 | txAbort(tid, 0); |
1da177e4 LT |
127 | goto out3; |
128 | } | |
129 | ||
130 | tblk = tid_to_tblock(tid); | |
131 | tblk->xflag |= COMMIT_CREATE; | |
132 | tblk->ino = ip->i_ino; | |
133 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
134 | ||
135 | iplist[0] = dip; | |
136 | iplist[1] = ip; | |
137 | ||
138 | /* | |
139 | * initialize the child XAD tree root in-line in inode | |
140 | */ | |
141 | xtInitRoot(tid, ip); | |
142 | ||
143 | /* | |
144 | * create entry in parent directory for child directory | |
145 | * (dtInsert() releases parent directory page) | |
146 | */ | |
147 | ino = ip->i_ino; | |
148 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
149 | if (rc == -EIO) { | |
150 | jfs_err("jfs_create: dtInsert returned -EIO"); | |
151 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
152 | } else | |
153 | txAbort(tid, 0); /* Filesystem full */ | |
154 | goto out3; | |
155 | } | |
156 | ||
157 | ip->i_op = &jfs_file_inode_operations; | |
158 | ip->i_fop = &jfs_file_operations; | |
159 | ip->i_mapping->a_ops = &jfs_aops; | |
160 | ||
1da177e4 LT |
161 | mark_inode_dirty(ip); |
162 | ||
163 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; | |
164 | ||
165 | mark_inode_dirty(dip); | |
166 | ||
167 | rc = txCommit(tid, 2, &iplist[0], 0); | |
168 | ||
169 | out3: | |
170 | txEnd(tid); | |
1de87444 | 171 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 172 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 173 | if (rc) { |
4f4b401b | 174 | free_ea_wmap(ip); |
1da177e4 | 175 | ip->i_nlink = 0; |
1f3403fa | 176 | unlock_new_inode(ip); |
1da177e4 | 177 | iput(ip); |
1f3403fa | 178 | } else { |
1da177e4 | 179 | d_instantiate(dentry, ip); |
1f3403fa DK |
180 | unlock_new_inode(ip); |
181 | } | |
1da177e4 LT |
182 | |
183 | out2: | |
184 | free_UCSname(&dname); | |
185 | ||
1da177e4 LT |
186 | out1: |
187 | ||
188 | jfs_info("jfs_create: rc:%d", rc); | |
189 | return rc; | |
190 | } | |
191 | ||
192 | ||
193 | /* | |
194 | * NAME: jfs_mkdir(dip, dentry, mode) | |
195 | * | |
196 | * FUNCTION: create a child directory in the parent directory <dip> | |
197 | * with name = <from dentry> and mode = <mode> | |
198 | * | |
63f83c9f | 199 | * PARAMETER: dip - parent directory vnode |
1da177e4 LT |
200 | * dentry - dentry of child directory |
201 | * mode - create mode (rwxrwxrwx). | |
202 | * | |
203 | * RETURN: Errors from subroutines | |
204 | * | |
205 | * note: | |
206 | * EACCESS: user needs search+write permission on the parent directory | |
207 | */ | |
208 | static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode) | |
209 | { | |
210 | int rc = 0; | |
211 | tid_t tid; /* transaction id */ | |
212 | struct inode *ip = NULL; /* child directory inode */ | |
213 | ino_t ino; | |
214 | struct component_name dname; /* child directory name */ | |
215 | struct btstack btstack; | |
216 | struct inode *iplist[2]; | |
217 | struct tblock *tblk; | |
218 | ||
219 | jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name); | |
220 | ||
871a2931 | 221 | dquot_initialize(dip); |
907f4554 | 222 | |
1da177e4 LT |
223 | /* link count overflow on parent directory ? */ |
224 | if (dip->i_nlink == JFS_LINK_MAX) { | |
225 | rc = -EMLINK; | |
226 | goto out1; | |
227 | } | |
228 | ||
229 | /* | |
230 | * search parent directory for entry/freespace | |
231 | * (dtSearch() returns parent directory page pinned) | |
232 | */ | |
233 | if ((rc = get_UCSname(&dname, dentry))) | |
234 | goto out1; | |
235 | ||
236 | /* | |
237 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
238 | * block there while holding dtree page, so we allocate the inode & | |
239 | * begin the transaction before we search the directory. | |
240 | */ | |
241 | ip = ialloc(dip, S_IFDIR | mode); | |
087387f9 AM |
242 | if (IS_ERR(ip)) { |
243 | rc = PTR_ERR(ip); | |
1da177e4 LT |
244 | goto out2; |
245 | } | |
246 | ||
247 | tid = txBegin(dip->i_sb, 0); | |
248 | ||
82d5b9a7 DK |
249 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
250 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 251 | |
4f4b401b DK |
252 | rc = jfs_init_acl(tid, ip, dip); |
253 | if (rc) | |
254 | goto out3; | |
255 | ||
1d15b10f DK |
256 | rc = jfs_init_security(tid, ip, dip); |
257 | if (rc) { | |
258 | txAbort(tid, 0); | |
259 | goto out3; | |
260 | } | |
261 | ||
1da177e4 LT |
262 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
263 | jfs_err("jfs_mkdir: dtSearch returned %d", rc); | |
4f4b401b | 264 | txAbort(tid, 0); |
1da177e4 LT |
265 | goto out3; |
266 | } | |
267 | ||
268 | tblk = tid_to_tblock(tid); | |
269 | tblk->xflag |= COMMIT_CREATE; | |
270 | tblk->ino = ip->i_ino; | |
271 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
272 | ||
273 | iplist[0] = dip; | |
274 | iplist[1] = ip; | |
275 | ||
276 | /* | |
277 | * initialize the child directory in-line in inode | |
278 | */ | |
279 | dtInitRoot(tid, ip, dip->i_ino); | |
280 | ||
281 | /* | |
282 | * create entry in parent directory for child directory | |
283 | * (dtInsert() releases parent directory page) | |
284 | */ | |
285 | ino = ip->i_ino; | |
286 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
287 | if (rc == -EIO) { | |
288 | jfs_err("jfs_mkdir: dtInsert returned -EIO"); | |
289 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
290 | } else | |
291 | txAbort(tid, 0); /* Filesystem full */ | |
292 | goto out3; | |
293 | } | |
294 | ||
295 | ip->i_nlink = 2; /* for '.' */ | |
296 | ip->i_op = &jfs_dir_inode_operations; | |
297 | ip->i_fop = &jfs_dir_operations; | |
298 | ||
1da177e4 LT |
299 | mark_inode_dirty(ip); |
300 | ||
301 | /* update parent directory inode */ | |
d8c76e6f | 302 | inc_nlink(dip); /* for '..' from child directory */ |
1da177e4 LT |
303 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
304 | mark_inode_dirty(dip); | |
305 | ||
306 | rc = txCommit(tid, 2, &iplist[0], 0); | |
307 | ||
308 | out3: | |
309 | txEnd(tid); | |
1de87444 | 310 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 311 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 312 | if (rc) { |
4f4b401b | 313 | free_ea_wmap(ip); |
1da177e4 | 314 | ip->i_nlink = 0; |
1f3403fa | 315 | unlock_new_inode(ip); |
1da177e4 | 316 | iput(ip); |
1f3403fa | 317 | } else { |
1da177e4 | 318 | d_instantiate(dentry, ip); |
1f3403fa DK |
319 | unlock_new_inode(ip); |
320 | } | |
1da177e4 LT |
321 | |
322 | out2: | |
323 | free_UCSname(&dname); | |
324 | ||
1da177e4 LT |
325 | |
326 | out1: | |
327 | ||
328 | jfs_info("jfs_mkdir: rc:%d", rc); | |
329 | return rc; | |
330 | } | |
331 | ||
332 | /* | |
333 | * NAME: jfs_rmdir(dip, dentry) | |
334 | * | |
335 | * FUNCTION: remove a link to child directory | |
336 | * | |
63f83c9f | 337 | * PARAMETER: dip - parent inode |
1da177e4 LT |
338 | * dentry - child directory dentry |
339 | * | |
340 | * RETURN: -EINVAL - if name is . or .. | |
f720e3ba | 341 | * -EINVAL - if . or .. exist but are invalid. |
1da177e4 LT |
342 | * errors from subroutines |
343 | * | |
344 | * note: | |
63f83c9f DK |
345 | * if other threads have the directory open when the last link |
346 | * is removed, the "." and ".." entries, if present, are removed before | |
347 | * rmdir() returns and no new entries may be created in the directory, | |
348 | * but the directory is not removed until the last reference to | |
1da177e4 LT |
349 | * the directory is released (cf.unlink() of regular file). |
350 | */ | |
351 | static int jfs_rmdir(struct inode *dip, struct dentry *dentry) | |
352 | { | |
353 | int rc; | |
354 | tid_t tid; /* transaction id */ | |
355 | struct inode *ip = dentry->d_inode; | |
356 | ino_t ino; | |
357 | struct component_name dname; | |
358 | struct inode *iplist[2]; | |
359 | struct tblock *tblk; | |
360 | ||
361 | jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name); | |
362 | ||
363 | /* Init inode for quota operations. */ | |
871a2931 CH |
364 | dquot_initialize(dip); |
365 | dquot_initialize(ip); | |
1da177e4 LT |
366 | |
367 | /* directory must be empty to be removed */ | |
368 | if (!dtEmpty(ip)) { | |
369 | rc = -ENOTEMPTY; | |
370 | goto out; | |
371 | } | |
372 | ||
373 | if ((rc = get_UCSname(&dname, dentry))) { | |
374 | goto out; | |
375 | } | |
376 | ||
377 | tid = txBegin(dip->i_sb, 0); | |
378 | ||
82d5b9a7 DK |
379 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
380 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
381 | |
382 | iplist[0] = dip; | |
383 | iplist[1] = ip; | |
384 | ||
385 | tblk = tid_to_tblock(tid); | |
386 | tblk->xflag |= COMMIT_DELETE; | |
387 | tblk->u.ip = ip; | |
388 | ||
389 | /* | |
390 | * delete the entry of target directory from parent directory | |
391 | */ | |
392 | ino = ip->i_ino; | |
393 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
394 | jfs_err("jfs_rmdir: dtDelete returned %d", rc); | |
395 | if (rc == -EIO) | |
396 | txAbort(tid, 1); | |
397 | txEnd(tid); | |
1de87444 | 398 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 399 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
400 | |
401 | goto out2; | |
402 | } | |
403 | ||
404 | /* update parent directory's link count corresponding | |
405 | * to ".." entry of the target directory deleted | |
406 | */ | |
1da177e4 | 407 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
9a53c3a7 | 408 | inode_dec_link_count(dip); |
1da177e4 LT |
409 | |
410 | /* | |
411 | * OS/2 could have created EA and/or ACL | |
412 | */ | |
413 | /* free EA from both persistent and working map */ | |
414 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
415 | /* free EA pages */ | |
416 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
417 | } | |
418 | JFS_IP(ip)->ea.flag = 0; | |
419 | ||
420 | /* free ACL from both persistent and working map */ | |
421 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
422 | /* free ACL pages */ | |
423 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
424 | } | |
425 | JFS_IP(ip)->acl.flag = 0; | |
426 | ||
427 | /* mark the target directory as deleted */ | |
ce71ec36 | 428 | clear_nlink(ip); |
1da177e4 LT |
429 | mark_inode_dirty(ip); |
430 | ||
431 | rc = txCommit(tid, 2, &iplist[0], 0); | |
432 | ||
433 | txEnd(tid); | |
434 | ||
1de87444 | 435 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 436 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
437 | |
438 | /* | |
439 | * Truncating the directory index table is not guaranteed. It | |
440 | * may need to be done iteratively | |
441 | */ | |
442 | if (test_cflag(COMMIT_Stale, dip)) { | |
443 | if (dip->i_size > 1) | |
444 | jfs_truncate_nolock(dip, 0); | |
445 | ||
446 | clear_cflag(COMMIT_Stale, dip); | |
447 | } | |
448 | ||
449 | out2: | |
450 | free_UCSname(&dname); | |
451 | ||
452 | out: | |
453 | jfs_info("jfs_rmdir: rc:%d", rc); | |
454 | return rc; | |
455 | } | |
456 | ||
457 | /* | |
458 | * NAME: jfs_unlink(dip, dentry) | |
459 | * | |
63f83c9f | 460 | * FUNCTION: remove a link to object <vp> named by <name> |
1da177e4 LT |
461 | * from parent directory <dvp> |
462 | * | |
63f83c9f DK |
463 | * PARAMETER: dip - inode of parent directory |
464 | * dentry - dentry of object to be removed | |
1da177e4 LT |
465 | * |
466 | * RETURN: errors from subroutines | |
467 | * | |
468 | * note: | |
469 | * temporary file: if one or more processes have the file open | |
470 | * when the last link is removed, the link will be removed before | |
471 | * unlink() returns, but the removal of the file contents will be | |
472 | * postponed until all references to the files are closed. | |
473 | * | |
474 | * JFS does NOT support unlink() on directories. | |
475 | * | |
476 | */ | |
477 | static int jfs_unlink(struct inode *dip, struct dentry *dentry) | |
478 | { | |
479 | int rc; | |
480 | tid_t tid; /* transaction id */ | |
481 | struct inode *ip = dentry->d_inode; | |
482 | ino_t ino; | |
483 | struct component_name dname; /* object name */ | |
484 | struct inode *iplist[2]; | |
485 | struct tblock *tblk; | |
486 | s64 new_size = 0; | |
487 | int commit_flag; | |
488 | ||
489 | jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name); | |
490 | ||
491 | /* Init inode for quota operations. */ | |
871a2931 CH |
492 | dquot_initialize(dip); |
493 | dquot_initialize(ip); | |
1da177e4 LT |
494 | |
495 | if ((rc = get_UCSname(&dname, dentry))) | |
496 | goto out; | |
497 | ||
82d5b9a7 | 498 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
499 | |
500 | tid = txBegin(dip->i_sb, 0); | |
501 | ||
82d5b9a7 DK |
502 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
503 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
504 | |
505 | iplist[0] = dip; | |
506 | iplist[1] = ip; | |
507 | ||
508 | /* | |
509 | * delete the entry of target file from parent directory | |
510 | */ | |
511 | ino = ip->i_ino; | |
512 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
513 | jfs_err("jfs_unlink: dtDelete returned %d", rc); | |
514 | if (rc == -EIO) | |
515 | txAbort(tid, 1); /* Marks FS Dirty */ | |
516 | txEnd(tid); | |
1de87444 | 517 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 518 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
519 | IWRITE_UNLOCK(ip); |
520 | goto out1; | |
521 | } | |
522 | ||
523 | ASSERT(ip->i_nlink); | |
524 | ||
525 | ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME; | |
526 | mark_inode_dirty(dip); | |
527 | ||
528 | /* update target's inode */ | |
9a53c3a7 | 529 | inode_dec_link_count(ip); |
1da177e4 LT |
530 | |
531 | /* | |
f720e3ba | 532 | * commit zero link count object |
1da177e4 LT |
533 | */ |
534 | if (ip->i_nlink == 0) { | |
535 | assert(!test_cflag(COMMIT_Nolink, ip)); | |
536 | /* free block resources */ | |
537 | if ((new_size = commitZeroLink(tid, ip)) < 0) { | |
538 | txAbort(tid, 1); /* Marks FS Dirty */ | |
539 | txEnd(tid); | |
1de87444 | 540 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 541 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
542 | IWRITE_UNLOCK(ip); |
543 | rc = new_size; | |
544 | goto out1; | |
545 | } | |
546 | tblk = tid_to_tblock(tid); | |
547 | tblk->xflag |= COMMIT_DELETE; | |
548 | tblk->u.ip = ip; | |
549 | } | |
550 | ||
551 | /* | |
552 | * Incomplete truncate of file data can | |
553 | * result in timing problems unless we synchronously commit the | |
554 | * transaction. | |
555 | */ | |
556 | if (new_size) | |
557 | commit_flag = COMMIT_SYNC; | |
558 | else | |
559 | commit_flag = 0; | |
560 | ||
561 | /* | |
562 | * If xtTruncate was incomplete, commit synchronously to avoid | |
563 | * timing complications | |
564 | */ | |
565 | rc = txCommit(tid, 2, &iplist[0], commit_flag); | |
566 | ||
567 | txEnd(tid); | |
568 | ||
1de87444 | 569 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 570 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
571 | |
572 | while (new_size && (rc == 0)) { | |
573 | tid = txBegin(dip->i_sb, 0); | |
1de87444 | 574 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
575 | new_size = xtTruncate_pmap(tid, ip, new_size); |
576 | if (new_size < 0) { | |
577 | txAbort(tid, 1); /* Marks FS Dirty */ | |
578 | rc = new_size; | |
579 | } else | |
580 | rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); | |
581 | txEnd(tid); | |
1de87444 | 582 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
583 | } |
584 | ||
585 | if (ip->i_nlink == 0) | |
586 | set_cflag(COMMIT_Nolink, ip); | |
587 | ||
588 | IWRITE_UNLOCK(ip); | |
589 | ||
590 | /* | |
591 | * Truncating the directory index table is not guaranteed. It | |
592 | * may need to be done iteratively | |
593 | */ | |
594 | if (test_cflag(COMMIT_Stale, dip)) { | |
595 | if (dip->i_size > 1) | |
596 | jfs_truncate_nolock(dip, 0); | |
597 | ||
598 | clear_cflag(COMMIT_Stale, dip); | |
599 | } | |
600 | ||
601 | out1: | |
602 | free_UCSname(&dname); | |
603 | out: | |
604 | jfs_info("jfs_unlink: rc:%d", rc); | |
605 | return rc; | |
606 | } | |
607 | ||
608 | /* | |
609 | * NAME: commitZeroLink() | |
610 | * | |
f720e3ba | 611 | * FUNCTION: for non-directory, called by jfs_remove(), |
1da177e4 | 612 | * truncate a regular file, directory or symbolic |
63f83c9f | 613 | * link to zero length. return 0 if type is not |
1da177e4 LT |
614 | * one of these. |
615 | * | |
616 | * if the file is currently associated with a VM segment | |
617 | * only permanent disk and inode map resources are freed, | |
618 | * and neither the inode nor indirect blocks are modified | |
619 | * so that the resources can be later freed in the work | |
620 | * map by ctrunc1. | |
621 | * if there is no VM segment on entry, the resources are | |
622 | * freed in both work and permanent map. | |
63f83c9f | 623 | * (? for temporary file - memory object is cached even |
1da177e4 LT |
624 | * after no reference: |
625 | * reference count > 0 - ) | |
626 | * | |
627 | * PARAMETERS: cd - pointer to commit data structure. | |
628 | * current inode is the one to truncate. | |
629 | * | |
630 | * RETURN: Errors from subroutines | |
631 | */ | |
632 | static s64 commitZeroLink(tid_t tid, struct inode *ip) | |
633 | { | |
634 | int filetype; | |
635 | struct tblock *tblk; | |
636 | ||
637 | jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); | |
638 | ||
639 | filetype = ip->i_mode & S_IFMT; | |
640 | switch (filetype) { | |
641 | case S_IFREG: | |
642 | break; | |
643 | case S_IFLNK: | |
644 | /* fast symbolic link */ | |
645 | if (ip->i_size < IDATASIZE) { | |
646 | ip->i_size = 0; | |
647 | return 0; | |
648 | } | |
649 | break; | |
650 | default: | |
651 | assert(filetype != S_IFDIR); | |
652 | return 0; | |
653 | } | |
654 | ||
655 | set_cflag(COMMIT_Freewmap, ip); | |
656 | ||
657 | /* mark transaction of block map update type */ | |
658 | tblk = tid_to_tblock(tid); | |
659 | tblk->xflag |= COMMIT_PMAP; | |
660 | ||
661 | /* | |
662 | * free EA | |
663 | */ | |
664 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) | |
665 | /* acquire maplock on EA to be freed from block map */ | |
666 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
667 | ||
668 | /* | |
669 | * free ACL | |
670 | */ | |
671 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) | |
672 | /* acquire maplock on EA to be freed from block map */ | |
673 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
674 | ||
675 | /* | |
676 | * free xtree/data (truncate to zero length): | |
63f83c9f | 677 | * free xtree/data pages from cache if COMMIT_PWMAP, |
1da177e4 LT |
678 | * free xtree/data blocks from persistent block map, and |
679 | * free xtree/data blocks from working block map if COMMIT_PWMAP; | |
680 | */ | |
681 | if (ip->i_size) | |
682 | return xtTruncate_pmap(tid, ip, 0); | |
683 | ||
684 | return 0; | |
685 | } | |
686 | ||
687 | ||
688 | /* | |
1868f4aa | 689 | * NAME: jfs_free_zero_link() |
1da177e4 | 690 | * |
f720e3ba | 691 | * FUNCTION: for non-directory, called by iClose(), |
63f83c9f | 692 | * free resources of a file from cache and WORKING map |
1da177e4 LT |
693 | * for a file previously committed with zero link count |
694 | * while associated with a pager object, | |
695 | * | |
696 | * PARAMETER: ip - pointer to inode of file. | |
1da177e4 | 697 | */ |
1868f4aa | 698 | void jfs_free_zero_link(struct inode *ip) |
1da177e4 | 699 | { |
1da177e4 LT |
700 | int type; |
701 | ||
1868f4aa | 702 | jfs_info("jfs_free_zero_link: ip = 0x%p", ip); |
1da177e4 LT |
703 | |
704 | /* return if not reg or symbolic link or if size is | |
705 | * already ok. | |
706 | */ | |
707 | type = ip->i_mode & S_IFMT; | |
708 | ||
709 | switch (type) { | |
710 | case S_IFREG: | |
711 | break; | |
712 | case S_IFLNK: | |
713 | /* if its contained in inode nothing to do */ | |
714 | if (ip->i_size < IDATASIZE) | |
1868f4aa | 715 | return; |
1da177e4 LT |
716 | break; |
717 | default: | |
1868f4aa | 718 | return; |
1da177e4 LT |
719 | } |
720 | ||
721 | /* | |
722 | * free EA | |
723 | */ | |
724 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
725 | s64 xaddr = addressDXD(&JFS_IP(ip)->ea); | |
726 | int xlen = lengthDXD(&JFS_IP(ip)->ea); | |
727 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
728 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
729 | ||
730 | /* free EA pages from cache */ | |
731 | invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); | |
732 | ||
733 | /* free EA extent from working block map */ | |
734 | maplock.index = 1; | |
735 | pxdlock = (struct pxd_lock *) & maplock; | |
736 | pxdlock->flag = mlckFREEPXD; | |
737 | PXDaddress(&pxdlock->pxd, xaddr); | |
738 | PXDlength(&pxdlock->pxd, xlen); | |
739 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
740 | } | |
741 | ||
742 | /* | |
743 | * free ACL | |
744 | */ | |
745 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
746 | s64 xaddr = addressDXD(&JFS_IP(ip)->acl); | |
747 | int xlen = lengthDXD(&JFS_IP(ip)->acl); | |
748 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
749 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
750 | ||
751 | invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); | |
752 | ||
753 | /* free ACL extent from working block map */ | |
754 | maplock.index = 1; | |
755 | pxdlock = (struct pxd_lock *) & maplock; | |
756 | pxdlock->flag = mlckFREEPXD; | |
757 | PXDaddress(&pxdlock->pxd, xaddr); | |
758 | PXDlength(&pxdlock->pxd, xlen); | |
759 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
760 | } | |
761 | ||
762 | /* | |
763 | * free xtree/data (truncate to zero length): | |
764 | * free xtree/data pages from cache, and | |
765 | * free xtree/data blocks from working block map; | |
766 | */ | |
767 | if (ip->i_size) | |
1868f4aa | 768 | xtTruncate(0, ip, 0, COMMIT_WMAP); |
1da177e4 LT |
769 | } |
770 | ||
771 | /* | |
772 | * NAME: jfs_link(vp, dvp, name, crp) | |
773 | * | |
774 | * FUNCTION: create a link to <vp> by the name = <name> | |
775 | * in the parent directory <dvp> | |
776 | * | |
63f83c9f | 777 | * PARAMETER: vp - target object |
1da177e4 LT |
778 | * dvp - parent directory of new link |
779 | * name - name of new link to target object | |
780 | * crp - credential | |
781 | * | |
782 | * RETURN: Errors from subroutines | |
783 | * | |
784 | * note: | |
785 | * JFS does NOT support link() on directories (to prevent circular | |
786 | * path in the directory hierarchy); | |
787 | * EPERM: the target object is a directory, and either the caller | |
788 | * does not have appropriate privileges or the implementation prohibits | |
789 | * using link() on directories [XPG4.2]. | |
790 | * | |
791 | * JFS does NOT support links between file systems: | |
792 | * EXDEV: target object and new link are on different file systems and | |
793 | * implementation does not support links between file systems [XPG4.2]. | |
794 | */ | |
795 | static int jfs_link(struct dentry *old_dentry, | |
796 | struct inode *dir, struct dentry *dentry) | |
797 | { | |
798 | int rc; | |
799 | tid_t tid; | |
800 | struct inode *ip = old_dentry->d_inode; | |
801 | ino_t ino; | |
802 | struct component_name dname; | |
803 | struct btstack btstack; | |
804 | struct inode *iplist[2]; | |
805 | ||
806 | jfs_info("jfs_link: %s %s", old_dentry->d_name.name, | |
807 | dentry->d_name.name); | |
808 | ||
809 | if (ip->i_nlink == JFS_LINK_MAX) | |
810 | return -EMLINK; | |
811 | ||
812 | if (ip->i_nlink == 0) | |
813 | return -ENOENT; | |
814 | ||
871a2931 | 815 | dquot_initialize(dir); |
907f4554 | 816 | |
1da177e4 LT |
817 | tid = txBegin(ip->i_sb, 0); |
818 | ||
82d5b9a7 DK |
819 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
820 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
821 | |
822 | /* | |
823 | * scan parent directory for entry/freespace | |
824 | */ | |
825 | if ((rc = get_UCSname(&dname, dentry))) | |
826 | goto out; | |
827 | ||
828 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) | |
829 | goto free_dname; | |
830 | ||
831 | /* | |
832 | * create entry for new link in parent directory | |
833 | */ | |
834 | ino = ip->i_ino; | |
835 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) | |
836 | goto free_dname; | |
837 | ||
838 | /* update object inode */ | |
d8c76e6f | 839 | inc_nlink(ip); /* for new link */ |
1da177e4 | 840 | ip->i_ctime = CURRENT_TIME; |
988a6490 | 841 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; |
1da177e4 | 842 | mark_inode_dirty(dir); |
7de9c6ee | 843 | ihold(ip); |
1da177e4 LT |
844 | |
845 | iplist[0] = ip; | |
846 | iplist[1] = dir; | |
847 | rc = txCommit(tid, 2, &iplist[0], 0); | |
848 | ||
849 | if (rc) { | |
9a53c3a7 | 850 | ip->i_nlink--; /* never instantiated */ |
1da177e4 LT |
851 | iput(ip); |
852 | } else | |
853 | d_instantiate(dentry, ip); | |
854 | ||
855 | free_dname: | |
856 | free_UCSname(&dname); | |
857 | ||
858 | out: | |
859 | txEnd(tid); | |
860 | ||
1de87444 | 861 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 862 | mutex_unlock(&JFS_IP(dir)->commit_mutex); |
1da177e4 LT |
863 | |
864 | jfs_info("jfs_link: rc:%d", rc); | |
865 | return rc; | |
866 | } | |
867 | ||
868 | /* | |
869 | * NAME: jfs_symlink(dip, dentry, name) | |
870 | * | |
871 | * FUNCTION: creates a symbolic link to <symlink> by name <name> | |
f720e3ba | 872 | * in directory <dip> |
1da177e4 | 873 | * |
f720e3ba DK |
874 | * PARAMETER: dip - parent directory vnode |
875 | * dentry - dentry of symbolic link | |
876 | * name - the path name of the existing object | |
877 | * that will be the source of the link | |
1da177e4 LT |
878 | * |
879 | * RETURN: errors from subroutines | |
880 | * | |
881 | * note: | |
882 | * ENAMETOOLONG: pathname resolution of a symbolic link produced | |
883 | * an intermediate result whose length exceeds PATH_MAX [XPG4.2] | |
884 | */ | |
885 | ||
886 | static int jfs_symlink(struct inode *dip, struct dentry *dentry, | |
887 | const char *name) | |
888 | { | |
889 | int rc; | |
890 | tid_t tid; | |
891 | ino_t ino = 0; | |
892 | struct component_name dname; | |
893 | int ssize; /* source pathname size */ | |
894 | struct btstack btstack; | |
895 | struct inode *ip = dentry->d_inode; | |
896 | unchar *i_fastsymlink; | |
897 | s64 xlen = 0; | |
898 | int bmask = 0, xsize; | |
899 | s64 extent = 0, xaddr; | |
900 | struct metapage *mp; | |
901 | struct super_block *sb; | |
902 | struct tblock *tblk; | |
903 | ||
904 | struct inode *iplist[2]; | |
905 | ||
906 | jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); | |
907 | ||
871a2931 | 908 | dquot_initialize(dip); |
907f4554 | 909 | |
1da177e4 LT |
910 | ssize = strlen(name) + 1; |
911 | ||
912 | /* | |
913 | * search parent directory for entry/freespace | |
914 | * (dtSearch() returns parent directory page pinned) | |
915 | */ | |
916 | ||
917 | if ((rc = get_UCSname(&dname, dentry))) | |
918 | goto out1; | |
919 | ||
920 | /* | |
921 | * allocate on-disk/in-memory inode for symbolic link: | |
922 | * (iAlloc() returns new, locked inode) | |
923 | */ | |
924 | ip = ialloc(dip, S_IFLNK | 0777); | |
087387f9 AM |
925 | if (IS_ERR(ip)) { |
926 | rc = PTR_ERR(ip); | |
1da177e4 LT |
927 | goto out2; |
928 | } | |
929 | ||
930 | tid = txBegin(dip->i_sb, 0); | |
931 | ||
82d5b9a7 DK |
932 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
933 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 934 | |
1d15b10f DK |
935 | rc = jfs_init_security(tid, ip, dip); |
936 | if (rc) | |
937 | goto out3; | |
938 | ||
1da177e4 LT |
939 | tblk = tid_to_tblock(tid); |
940 | tblk->xflag |= COMMIT_CREATE; | |
941 | tblk->ino = ip->i_ino; | |
942 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
943 | ||
944 | /* fix symlink access permission | |
63f83c9f | 945 | * (dir_create() ANDs in the u.u_cmask, |
1da177e4 LT |
946 | * but symlinks really need to be 777 access) |
947 | */ | |
948 | ip->i_mode |= 0777; | |
949 | ||
950 | /* | |
951 | * write symbolic link target path name | |
952 | */ | |
953 | xtInitRoot(tid, ip); | |
954 | ||
955 | /* | |
956 | * write source path name inline in on-disk inode (fast symbolic link) | |
957 | */ | |
958 | ||
959 | if (ssize <= IDATASIZE) { | |
c7f2e1f0 | 960 | ip->i_op = &jfs_fast_symlink_inode_operations; |
1da177e4 LT |
961 | |
962 | i_fastsymlink = JFS_IP(ip)->i_inline; | |
963 | memcpy(i_fastsymlink, name, ssize); | |
964 | ip->i_size = ssize - 1; | |
965 | ||
966 | /* | |
967 | * if symlink is > 128 bytes, we don't have the space to | |
968 | * store inline extended attributes | |
969 | */ | |
970 | if (ssize > sizeof (JFS_IP(ip)->i_inline)) | |
971 | JFS_IP(ip)->mode2 &= ~INLINEEA; | |
972 | ||
973 | jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", | |
974 | ssize, name); | |
975 | } | |
976 | /* | |
977 | * write source path name in a single extent | |
978 | */ | |
979 | else { | |
980 | jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); | |
981 | ||
c7f2e1f0 | 982 | ip->i_op = &jfs_symlink_inode_operations; |
1da177e4 LT |
983 | ip->i_mapping->a_ops = &jfs_aops; |
984 | ||
985 | /* | |
63f83c9f | 986 | * even though the data of symlink object (source |
1da177e4 LT |
987 | * path name) is treated as non-journaled user data, |
988 | * it is read/written thru buffer cache for performance. | |
989 | */ | |
990 | sb = ip->i_sb; | |
991 | bmask = JFS_SBI(sb)->bsize - 1; | |
992 | xsize = (ssize + bmask) & ~bmask; | |
993 | xaddr = 0; | |
994 | xlen = xsize >> JFS_SBI(sb)->l2bsize; | |
995 | if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { | |
996 | txAbort(tid, 0); | |
1da177e4 LT |
997 | goto out3; |
998 | } | |
999 | extent = xaddr; | |
1000 | ip->i_size = ssize - 1; | |
1001 | while (ssize) { | |
1002 | /* This is kind of silly since PATH_MAX == 4K */ | |
1003 | int copy_size = min(ssize, PSIZE); | |
1004 | ||
1005 | mp = get_metapage(ip, xaddr, PSIZE, 1); | |
1006 | ||
1007 | if (mp == NULL) { | |
1008 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
1009 | rc = -EIO; | |
1010 | txAbort(tid, 0); | |
1011 | goto out3; | |
1012 | } | |
1013 | memcpy(mp->data, name, copy_size); | |
1014 | flush_metapage(mp); | |
1015 | ssize -= copy_size; | |
1016 | name += copy_size; | |
1017 | xaddr += JFS_SBI(sb)->nbperpage; | |
1018 | } | |
1019 | } | |
1020 | ||
1021 | /* | |
1022 | * create entry for symbolic link in parent directory | |
1023 | */ | |
1024 | rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); | |
1025 | if (rc == 0) { | |
1026 | ino = ip->i_ino; | |
1027 | rc = dtInsert(tid, dip, &dname, &ino, &btstack); | |
1028 | } | |
1029 | if (rc) { | |
1030 | if (xlen) | |
1031 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
1032 | txAbort(tid, 0); | |
1033 | /* discard new inode */ | |
1034 | goto out3; | |
1035 | } | |
1036 | ||
1da177e4 LT |
1037 | mark_inode_dirty(ip); |
1038 | ||
988a6490 DK |
1039 | dip->i_ctime = dip->i_mtime = CURRENT_TIME; |
1040 | mark_inode_dirty(dip); | |
1da177e4 LT |
1041 | /* |
1042 | * commit update of parent directory and link object | |
1043 | */ | |
1044 | ||
1045 | iplist[0] = dip; | |
1046 | iplist[1] = ip; | |
1047 | rc = txCommit(tid, 2, &iplist[0], 0); | |
1048 | ||
1049 | out3: | |
1050 | txEnd(tid); | |
1de87444 | 1051 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 1052 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 1053 | if (rc) { |
4f4b401b | 1054 | free_ea_wmap(ip); |
1da177e4 | 1055 | ip->i_nlink = 0; |
1f3403fa | 1056 | unlock_new_inode(ip); |
1da177e4 | 1057 | iput(ip); |
1f3403fa | 1058 | } else { |
1da177e4 | 1059 | d_instantiate(dentry, ip); |
1f3403fa DK |
1060 | unlock_new_inode(ip); |
1061 | } | |
1da177e4 LT |
1062 | |
1063 | out2: | |
1064 | free_UCSname(&dname); | |
1065 | ||
1da177e4 LT |
1066 | out1: |
1067 | jfs_info("jfs_symlink: rc:%d", rc); | |
1068 | return rc; | |
1069 | } | |
1070 | ||
1071 | ||
1072 | /* | |
f720e3ba | 1073 | * NAME: jfs_rename |
1da177e4 | 1074 | * |
f720e3ba | 1075 | * FUNCTION: rename a file or directory |
1da177e4 LT |
1076 | */ |
1077 | static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
1078 | struct inode *new_dir, struct dentry *new_dentry) | |
1079 | { | |
1080 | struct btstack btstack; | |
1081 | ino_t ino; | |
1082 | struct component_name new_dname; | |
1083 | struct inode *new_ip; | |
1084 | struct component_name old_dname; | |
1085 | struct inode *old_ip; | |
1086 | int rc; | |
1087 | tid_t tid; | |
1088 | struct tlock *tlck; | |
1089 | struct dt_lock *dtlck; | |
1090 | struct lv *lv; | |
1091 | int ipcount; | |
1092 | struct inode *iplist[4]; | |
1093 | struct tblock *tblk; | |
1094 | s64 new_size = 0; | |
1095 | int commit_flag; | |
1096 | ||
1097 | ||
1098 | jfs_info("jfs_rename: %s %s", old_dentry->d_name.name, | |
1099 | new_dentry->d_name.name); | |
1100 | ||
871a2931 CH |
1101 | dquot_initialize(old_dir); |
1102 | dquot_initialize(new_dir); | |
907f4554 | 1103 | |
1da177e4 LT |
1104 | old_ip = old_dentry->d_inode; |
1105 | new_ip = new_dentry->d_inode; | |
1106 | ||
1107 | if ((rc = get_UCSname(&old_dname, old_dentry))) | |
1108 | goto out1; | |
1109 | ||
1110 | if ((rc = get_UCSname(&new_dname, new_dentry))) | |
1111 | goto out2; | |
1112 | ||
1113 | /* | |
1114 | * Make sure source inode number is what we think it is | |
1115 | */ | |
1116 | rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); | |
1117 | if (rc || (ino != old_ip->i_ino)) { | |
1118 | rc = -ENOENT; | |
1119 | goto out3; | |
1120 | } | |
1121 | ||
1122 | /* | |
1123 | * Make sure dest inode number (if any) is what we think it is | |
1124 | */ | |
1125 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); | |
09aaa749 | 1126 | if (!rc) { |
da8a41d1 | 1127 | if ((!new_ip) || (ino != new_ip->i_ino)) { |
1da177e4 LT |
1128 | rc = -ESTALE; |
1129 | goto out3; | |
1130 | } | |
1131 | } else if (rc != -ENOENT) | |
1132 | goto out3; | |
1133 | else if (new_ip) { | |
1134 | /* no entry exists, but one was expected */ | |
1135 | rc = -ESTALE; | |
1136 | goto out3; | |
1137 | } | |
1138 | ||
1139 | if (S_ISDIR(old_ip->i_mode)) { | |
1140 | if (new_ip) { | |
1141 | if (!dtEmpty(new_ip)) { | |
1142 | rc = -ENOTEMPTY; | |
1143 | goto out3; | |
1144 | } | |
1145 | } else if ((new_dir != old_dir) && | |
1146 | (new_dir->i_nlink == JFS_LINK_MAX)) { | |
1147 | rc = -EMLINK; | |
1148 | goto out3; | |
1149 | } | |
1150 | } else if (new_ip) { | |
82d5b9a7 | 1151 | IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); |
1da177e4 | 1152 | /* Init inode for quota operations. */ |
871a2931 | 1153 | dquot_initialize(new_ip); |
1da177e4 LT |
1154 | } |
1155 | ||
1156 | /* | |
1157 | * The real work starts here | |
1158 | */ | |
1159 | tid = txBegin(new_dir->i_sb, 0); | |
1160 | ||
82d5b9a7 DK |
1161 | /* |
1162 | * How do we know the locking is safe from deadlocks? | |
1163 | * The vfs does the hard part for us. Any time we are taking nested | |
1164 | * commit_mutexes, the vfs already has i_mutex held on the parent. | |
1165 | * Here, the vfs has already taken i_mutex on both old_dir and new_dir. | |
1166 | */ | |
1167 | mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); | |
1168 | mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 1169 | if (old_dir != new_dir) |
82d5b9a7 DK |
1170 | mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, |
1171 | COMMIT_MUTEX_SECOND_PARENT); | |
1da177e4 LT |
1172 | |
1173 | if (new_ip) { | |
82d5b9a7 DK |
1174 | mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, |
1175 | COMMIT_MUTEX_VICTIM); | |
1da177e4 LT |
1176 | /* |
1177 | * Change existing directory entry to new inode number | |
1178 | */ | |
1179 | ino = new_ip->i_ino; | |
1180 | rc = dtModify(tid, new_dir, &new_dname, &ino, | |
1181 | old_ip->i_ino, JFS_RENAME); | |
1182 | if (rc) | |
1183 | goto out4; | |
9a53c3a7 | 1184 | drop_nlink(new_ip); |
1da177e4 | 1185 | if (S_ISDIR(new_ip->i_mode)) { |
9a53c3a7 | 1186 | drop_nlink(new_ip); |
1da177e4 | 1187 | if (new_ip->i_nlink) { |
48ce8b05 | 1188 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 | 1189 | if (old_dir != new_dir) |
1de87444 | 1190 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); |
48ce8b05 ED |
1191 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); |
1192 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); | |
1da177e4 LT |
1193 | if (!S_ISDIR(old_ip->i_mode) && new_ip) |
1194 | IWRITE_UNLOCK(new_ip); | |
1195 | jfs_error(new_ip->i_sb, | |
1196 | "jfs_rename: new_ip->i_nlink != 0"); | |
1197 | return -EIO; | |
1198 | } | |
1199 | tblk = tid_to_tblock(tid); | |
1200 | tblk->xflag |= COMMIT_DELETE; | |
1201 | tblk->u.ip = new_ip; | |
1202 | } else if (new_ip->i_nlink == 0) { | |
1203 | assert(!test_cflag(COMMIT_Nolink, new_ip)); | |
1204 | /* free block resources */ | |
1205 | if ((new_size = commitZeroLink(tid, new_ip)) < 0) { | |
1206 | txAbort(tid, 1); /* Marks FS Dirty */ | |
63f83c9f | 1207 | rc = new_size; |
1da177e4 LT |
1208 | goto out4; |
1209 | } | |
1210 | tblk = tid_to_tblock(tid); | |
1211 | tblk->xflag |= COMMIT_DELETE; | |
1212 | tblk->u.ip = new_ip; | |
1213 | } else { | |
1214 | new_ip->i_ctime = CURRENT_TIME; | |
1215 | mark_inode_dirty(new_ip); | |
1216 | } | |
1217 | } else { | |
1218 | /* | |
1219 | * Add new directory entry | |
1220 | */ | |
1221 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, | |
1222 | JFS_CREATE); | |
1223 | if (rc) { | |
1224 | jfs_err("jfs_rename didn't expect dtSearch to fail " | |
1225 | "w/rc = %d", rc); | |
1226 | goto out4; | |
1227 | } | |
1228 | ||
1229 | ino = old_ip->i_ino; | |
1230 | rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); | |
1231 | if (rc) { | |
1232 | if (rc == -EIO) | |
1233 | jfs_err("jfs_rename: dtInsert returned -EIO"); | |
1234 | goto out4; | |
1235 | } | |
1236 | if (S_ISDIR(old_ip->i_mode)) | |
d8c76e6f | 1237 | inc_nlink(new_dir); |
1da177e4 LT |
1238 | } |
1239 | /* | |
1240 | * Remove old directory entry | |
1241 | */ | |
1242 | ||
1243 | ino = old_ip->i_ino; | |
1244 | rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); | |
1245 | if (rc) { | |
1246 | jfs_err("jfs_rename did not expect dtDelete to return rc = %d", | |
1247 | rc); | |
1248 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
1249 | goto out4; | |
1250 | } | |
1251 | if (S_ISDIR(old_ip->i_mode)) { | |
9a53c3a7 | 1252 | drop_nlink(old_dir); |
1da177e4 LT |
1253 | if (old_dir != new_dir) { |
1254 | /* | |
1255 | * Change inode number of parent for moved directory | |
1256 | */ | |
1257 | ||
1258 | JFS_IP(old_ip)->i_dtroot.header.idotdot = | |
1259 | cpu_to_le32(new_dir->i_ino); | |
1260 | ||
1261 | /* Linelock header of dtree */ | |
1262 | tlck = txLock(tid, old_ip, | |
1263 | (struct metapage *) &JFS_IP(old_ip)->bxflag, | |
1264 | tlckDTREE | tlckBTROOT | tlckRELINK); | |
1265 | dtlck = (struct dt_lock *) & tlck->lock; | |
1266 | ASSERT(dtlck->index == 0); | |
1267 | lv = & dtlck->lv[0]; | |
1268 | lv->offset = 0; | |
1269 | lv->length = 1; | |
1270 | dtlck->index++; | |
1271 | } | |
1272 | } | |
1273 | ||
1274 | /* | |
1275 | * Update ctime on changed/moved inodes & mark dirty | |
1276 | */ | |
1277 | old_ip->i_ctime = CURRENT_TIME; | |
1278 | mark_inode_dirty(old_ip); | |
1279 | ||
1280 | new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb); | |
1281 | mark_inode_dirty(new_dir); | |
1282 | ||
1283 | /* Build list of inodes modified by this transaction */ | |
1284 | ipcount = 0; | |
1285 | iplist[ipcount++] = old_ip; | |
1286 | if (new_ip) | |
1287 | iplist[ipcount++] = new_ip; | |
1288 | iplist[ipcount++] = old_dir; | |
1289 | ||
1290 | if (old_dir != new_dir) { | |
1291 | iplist[ipcount++] = new_dir; | |
1292 | old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME; | |
1293 | mark_inode_dirty(old_dir); | |
1294 | } | |
1295 | ||
1296 | /* | |
1297 | * Incomplete truncate of file data can | |
1298 | * result in timing problems unless we synchronously commit the | |
1299 | * transaction. | |
1300 | */ | |
1301 | if (new_size) | |
1302 | commit_flag = COMMIT_SYNC; | |
1303 | else | |
1304 | commit_flag = 0; | |
1305 | ||
1306 | rc = txCommit(tid, ipcount, iplist, commit_flag); | |
1307 | ||
1308 | out4: | |
1309 | txEnd(tid); | |
1da177e4 | 1310 | if (new_ip) |
1de87444 | 1311 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
48ce8b05 ED |
1312 | if (old_dir != new_dir) |
1313 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); | |
1314 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); | |
1315 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); | |
1da177e4 LT |
1316 | |
1317 | while (new_size && (rc == 0)) { | |
1318 | tid = txBegin(new_ip->i_sb, 0); | |
1de87444 | 1319 | mutex_lock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 LT |
1320 | new_size = xtTruncate_pmap(tid, new_ip, new_size); |
1321 | if (new_size < 0) { | |
1322 | txAbort(tid, 1); | |
63f83c9f | 1323 | rc = new_size; |
1da177e4 LT |
1324 | } else |
1325 | rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); | |
1326 | txEnd(tid); | |
1de87444 | 1327 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 LT |
1328 | } |
1329 | if (new_ip && (new_ip->i_nlink == 0)) | |
1330 | set_cflag(COMMIT_Nolink, new_ip); | |
1331 | out3: | |
1332 | free_UCSname(&new_dname); | |
1333 | out2: | |
1334 | free_UCSname(&old_dname); | |
1335 | out1: | |
1336 | if (new_ip && !S_ISDIR(new_ip->i_mode)) | |
1337 | IWRITE_UNLOCK(new_ip); | |
1338 | /* | |
1339 | * Truncating the directory index table is not guaranteed. It | |
1340 | * may need to be done iteratively | |
1341 | */ | |
1342 | if (test_cflag(COMMIT_Stale, old_dir)) { | |
1343 | if (old_dir->i_size > 1) | |
1344 | jfs_truncate_nolock(old_dir, 0); | |
1345 | ||
1346 | clear_cflag(COMMIT_Stale, old_dir); | |
1347 | } | |
1348 | ||
1349 | jfs_info("jfs_rename: returning %d", rc); | |
1350 | return rc; | |
1351 | } | |
1352 | ||
1353 | ||
1354 | /* | |
f720e3ba | 1355 | * NAME: jfs_mknod |
1da177e4 | 1356 | * |
f720e3ba | 1357 | * FUNCTION: Create a special file (device) |
1da177e4 LT |
1358 | */ |
1359 | static int jfs_mknod(struct inode *dir, struct dentry *dentry, | |
1360 | int mode, dev_t rdev) | |
1361 | { | |
1362 | struct jfs_inode_info *jfs_ip; | |
1363 | struct btstack btstack; | |
1364 | struct component_name dname; | |
1365 | ino_t ino; | |
1366 | struct inode *ip; | |
1367 | struct inode *iplist[2]; | |
1368 | int rc; | |
1369 | tid_t tid; | |
1370 | struct tblock *tblk; | |
1371 | ||
1372 | if (!new_valid_dev(rdev)) | |
1373 | return -EINVAL; | |
1374 | ||
1375 | jfs_info("jfs_mknod: %s", dentry->d_name.name); | |
1376 | ||
871a2931 | 1377 | dquot_initialize(dir); |
907f4554 | 1378 | |
1da177e4 LT |
1379 | if ((rc = get_UCSname(&dname, dentry))) |
1380 | goto out; | |
1381 | ||
1382 | ip = ialloc(dir, mode); | |
087387f9 AM |
1383 | if (IS_ERR(ip)) { |
1384 | rc = PTR_ERR(ip); | |
1da177e4 LT |
1385 | goto out1; |
1386 | } | |
1387 | jfs_ip = JFS_IP(ip); | |
1388 | ||
1389 | tid = txBegin(dir->i_sb, 0); | |
1390 | ||
82d5b9a7 DK |
1391 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
1392 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 1393 | |
4f4b401b DK |
1394 | rc = jfs_init_acl(tid, ip, dir); |
1395 | if (rc) | |
1da177e4 LT |
1396 | goto out3; |
1397 | ||
1d15b10f DK |
1398 | rc = jfs_init_security(tid, ip, dir); |
1399 | if (rc) { | |
1400 | txAbort(tid, 0); | |
1401 | goto out3; | |
1402 | } | |
1403 | ||
4f4b401b DK |
1404 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { |
1405 | txAbort(tid, 0); | |
1406 | goto out3; | |
1407 | } | |
1408 | ||
1da177e4 LT |
1409 | tblk = tid_to_tblock(tid); |
1410 | tblk->xflag |= COMMIT_CREATE; | |
1411 | tblk->ino = ip->i_ino; | |
1412 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
1413 | ||
1414 | ino = ip->i_ino; | |
4f4b401b DK |
1415 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { |
1416 | txAbort(tid, 0); | |
1da177e4 | 1417 | goto out3; |
4f4b401b | 1418 | } |
1da177e4 LT |
1419 | |
1420 | ip->i_op = &jfs_file_inode_operations; | |
1421 | jfs_ip->dev = new_encode_dev(rdev); | |
1422 | init_special_inode(ip, ip->i_mode, rdev); | |
1423 | ||
1da177e4 LT |
1424 | mark_inode_dirty(ip); |
1425 | ||
1426 | dir->i_ctime = dir->i_mtime = CURRENT_TIME; | |
1427 | ||
1428 | mark_inode_dirty(dir); | |
1429 | ||
1430 | iplist[0] = dir; | |
1431 | iplist[1] = ip; | |
1432 | rc = txCommit(tid, 2, iplist, 0); | |
1433 | ||
1434 | out3: | |
1435 | txEnd(tid); | |
1de87444 IM |
1436 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1437 | mutex_unlock(&JFS_IP(dir)->commit_mutex); | |
1da177e4 | 1438 | if (rc) { |
4f4b401b | 1439 | free_ea_wmap(ip); |
1da177e4 | 1440 | ip->i_nlink = 0; |
1f3403fa | 1441 | unlock_new_inode(ip); |
1da177e4 | 1442 | iput(ip); |
1f3403fa | 1443 | } else { |
1da177e4 | 1444 | d_instantiate(dentry, ip); |
1f3403fa DK |
1445 | unlock_new_inode(ip); |
1446 | } | |
1da177e4 LT |
1447 | |
1448 | out1: | |
1449 | free_UCSname(&dname); | |
1450 | ||
1da177e4 LT |
1451 | out: |
1452 | jfs_info("jfs_mknod: returning %d", rc); | |
1453 | return rc; | |
1454 | } | |
1455 | ||
1456 | static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd) | |
1457 | { | |
1458 | struct btstack btstack; | |
1459 | ino_t inum; | |
1460 | struct inode *ip; | |
1461 | struct component_name key; | |
1462 | const char *name = dentry->d_name.name; | |
1463 | int len = dentry->d_name.len; | |
1464 | int rc; | |
1465 | ||
1466 | jfs_info("jfs_lookup: name = %s", name); | |
1467 | ||
686762c8 DK |
1468 | if (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2) |
1469 | dentry->d_op = &jfs_ci_dentry_operations; | |
1da177e4 LT |
1470 | |
1471 | if ((name[0] == '.') && (len == 1)) | |
1472 | inum = dip->i_ino; | |
1473 | else if (strcmp(name, "..") == 0) | |
1474 | inum = PARENT(dip); | |
1475 | else { | |
1476 | if ((rc = get_UCSname(&key, dentry))) | |
1477 | return ERR_PTR(rc); | |
1478 | rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); | |
1479 | free_UCSname(&key); | |
1480 | if (rc == -ENOENT) { | |
1481 | d_add(dentry, NULL); | |
88f85a55 | 1482 | return NULL; |
1da177e4 LT |
1483 | } else if (rc) { |
1484 | jfs_err("jfs_lookup: dtSearch returned %d", rc); | |
1485 | return ERR_PTR(rc); | |
1486 | } | |
1487 | } | |
1488 | ||
eab1df71 DH |
1489 | ip = jfs_iget(dip->i_sb, inum); |
1490 | if (IS_ERR(ip)) { | |
1da177e4 | 1491 | jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum); |
eab1df71 | 1492 | return ERR_CAST(ip); |
1da177e4 LT |
1493 | } |
1494 | ||
1da177e4 LT |
1495 | dentry = d_splice_alias(ip, dentry); |
1496 | ||
1497 | if (dentry && (JFS_SBI(dip->i_sb)->mntflag & JFS_OS2)) | |
1498 | dentry->d_op = &jfs_ci_dentry_operations; | |
1499 | ||
1500 | return dentry; | |
1501 | } | |
1502 | ||
d425de70 CH |
1503 | static struct inode *jfs_nfs_get_inode(struct super_block *sb, |
1504 | u64 ino, u32 generation) | |
5ca29607 | 1505 | { |
5ca29607 | 1506 | struct inode *inode; |
5ca29607 CH |
1507 | |
1508 | if (ino == 0) | |
1509 | return ERR_PTR(-ESTALE); | |
eab1df71 DH |
1510 | inode = jfs_iget(sb, ino); |
1511 | if (IS_ERR(inode)) | |
1512 | return ERR_CAST(inode); | |
5ca29607 | 1513 | |
eab1df71 | 1514 | if (generation && inode->i_generation != generation) { |
d425de70 CH |
1515 | iput(inode); |
1516 | return ERR_PTR(-ESTALE); | |
5ca29607 CH |
1517 | } |
1518 | ||
d425de70 CH |
1519 | return inode; |
1520 | } | |
5ca29607 | 1521 | |
d425de70 CH |
1522 | struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
1523 | int fh_len, int fh_type) | |
1524 | { | |
1525 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
1526 | jfs_nfs_get_inode); | |
1527 | } | |
1528 | ||
1529 | struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
1530 | int fh_len, int fh_type) | |
1531 | { | |
1532 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
1533 | jfs_nfs_get_inode); | |
5ca29607 CH |
1534 | } |
1535 | ||
1da177e4 LT |
1536 | struct dentry *jfs_get_parent(struct dentry *dentry) |
1537 | { | |
1da177e4 LT |
1538 | unsigned long parent_ino; |
1539 | ||
1540 | parent_ino = | |
1541 | le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot); | |
1da177e4 | 1542 | |
44003728 | 1543 | return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino)); |
1da177e4 LT |
1544 | } |
1545 | ||
92e1d5be | 1546 | const struct inode_operations jfs_dir_inode_operations = { |
1da177e4 LT |
1547 | .create = jfs_create, |
1548 | .lookup = jfs_lookup, | |
1549 | .link = jfs_link, | |
1550 | .unlink = jfs_unlink, | |
1551 | .symlink = jfs_symlink, | |
1552 | .mkdir = jfs_mkdir, | |
1553 | .rmdir = jfs_rmdir, | |
1554 | .mknod = jfs_mknod, | |
1555 | .rename = jfs_rename, | |
1556 | .setxattr = jfs_setxattr, | |
1557 | .getxattr = jfs_getxattr, | |
1558 | .listxattr = jfs_listxattr, | |
1559 | .removexattr = jfs_removexattr, | |
1da177e4 | 1560 | .setattr = jfs_setattr, |
759bfee6 | 1561 | #ifdef CONFIG_JFS_POSIX_ACL |
18f4c644 | 1562 | .check_acl = jfs_check_acl, |
1da177e4 LT |
1563 | #endif |
1564 | }; | |
1565 | ||
4b6f5d20 | 1566 | const struct file_operations jfs_dir_operations = { |
1da177e4 LT |
1567 | .read = generic_read_dir, |
1568 | .readdir = jfs_readdir, | |
1569 | .fsync = jfs_fsync, | |
baab81fa | 1570 | .unlocked_ioctl = jfs_ioctl, |
ef1fc2f0 AK |
1571 | #ifdef CONFIG_COMPAT |
1572 | .compat_ioctl = jfs_compat_ioctl, | |
1573 | #endif | |
3222a3e5 | 1574 | .llseek = generic_file_llseek, |
1da177e4 LT |
1575 | }; |
1576 | ||
1577 | static int jfs_ci_hash(struct dentry *dir, struct qstr *this) | |
1578 | { | |
1579 | unsigned long hash; | |
1580 | int i; | |
1581 | ||
1582 | hash = init_name_hash(); | |
1583 | for (i=0; i < this->len; i++) | |
1584 | hash = partial_name_hash(tolower(this->name[i]), hash); | |
1585 | this->hash = end_name_hash(hash); | |
1586 | ||
1587 | return 0; | |
1588 | } | |
1589 | ||
1590 | static int jfs_ci_compare(struct dentry *dir, struct qstr *a, struct qstr *b) | |
1591 | { | |
1592 | int i, result = 1; | |
1593 | ||
1594 | if (a->len != b->len) | |
1595 | goto out; | |
1596 | for (i=0; i < a->len; i++) { | |
1597 | if (tolower(a->name[i]) != tolower(b->name[i])) | |
1598 | goto out; | |
1599 | } | |
1600 | result = 0; | |
2bc334dc NP |
1601 | out: |
1602 | return result; | |
1603 | } | |
1da177e4 | 1604 | |
2bc334dc NP |
1605 | static int jfs_ci_revalidate(struct dentry *dentry, struct nameidata *nd) |
1606 | { | |
1da177e4 | 1607 | /* |
2bc334dc NP |
1608 | * This is not negative dentry. Always valid. |
1609 | * | |
1610 | * Note, rename() to existing directory entry will have ->d_inode, | |
1611 | * and will use existing name which isn't specified name by user. | |
1612 | * | |
1613 | * We may be able to drop this positive dentry here. But dropping | |
1614 | * positive dentry isn't good idea. So it's unsupported like | |
1615 | * rename("filename", "FILENAME") for now. | |
1da177e4 | 1616 | */ |
2bc334dc NP |
1617 | if (dentry->d_inode) |
1618 | return 1; | |
1619 | ||
1620 | /* | |
1621 | * This may be nfsd (or something), anyway, we can't see the | |
1622 | * intent of this. So, since this can be for creation, drop it. | |
1623 | */ | |
1624 | if (!nd) | |
1625 | return 0; | |
1626 | ||
1627 | /* | |
1628 | * Drop the negative dentry, in order to make sure to use the | |
1629 | * case sensitive name which is specified by user if this is | |
1630 | * for creation. | |
1631 | */ | |
1632 | if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) { | |
1633 | if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) | |
1634 | return 0; | |
1635 | } | |
1636 | return 1; | |
1da177e4 LT |
1637 | } |
1638 | ||
ad28b4ef | 1639 | const struct dentry_operations jfs_ci_dentry_operations = |
1da177e4 LT |
1640 | { |
1641 | .d_hash = jfs_ci_hash, | |
1642 | .d_compare = jfs_ci_compare, | |
2bc334dc | 1643 | .d_revalidate = jfs_ci_revalidate, |
1da177e4 | 1644 | }; |