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Commit | Line | Data |
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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 | |
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 | */ | |
4acdaf27 | 75 | static int jfs_create(struct inode *dip, struct dentry *dentry, umode_t mode, |
ebfc3b49 | 76 | bool excl) |
1da177e4 LT |
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 | ||
a455589f | 87 | jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry); |
1da177e4 | 88 | |
acc84b05 DK |
89 | rc = dquot_initialize(dip); |
90 | if (rc) | |
91 | goto out1; | |
907f4554 | 92 | |
1da177e4 LT |
93 | /* |
94 | * search parent directory for entry/freespace | |
95 | * (dtSearch() returns parent directory page pinned) | |
96 | */ | |
97 | if ((rc = get_UCSname(&dname, dentry))) | |
98 | goto out1; | |
99 | ||
100 | /* | |
101 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
102 | * block there while holding dtree page, so we allocate the inode & | |
103 | * begin the transaction before we search the directory. | |
104 | */ | |
105 | ip = ialloc(dip, mode); | |
087387f9 AM |
106 | if (IS_ERR(ip)) { |
107 | rc = PTR_ERR(ip); | |
1da177e4 LT |
108 | goto out2; |
109 | } | |
110 | ||
111 | tid = txBegin(dip->i_sb, 0); | |
112 | ||
82d5b9a7 DK |
113 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
114 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 115 | |
4f4b401b DK |
116 | rc = jfs_init_acl(tid, ip, dip); |
117 | if (rc) | |
118 | goto out3; | |
119 | ||
2a7dba39 | 120 | rc = jfs_init_security(tid, ip, dip, &dentry->d_name); |
1d15b10f DK |
121 | if (rc) { |
122 | txAbort(tid, 0); | |
123 | goto out3; | |
124 | } | |
125 | ||
1da177e4 LT |
126 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
127 | jfs_err("jfs_create: dtSearch returned %d", rc); | |
4f4b401b | 128 | txAbort(tid, 0); |
1da177e4 LT |
129 | goto out3; |
130 | } | |
131 | ||
132 | tblk = tid_to_tblock(tid); | |
133 | tblk->xflag |= COMMIT_CREATE; | |
134 | tblk->ino = ip->i_ino; | |
135 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
136 | ||
137 | iplist[0] = dip; | |
138 | iplist[1] = ip; | |
139 | ||
140 | /* | |
141 | * initialize the child XAD tree root in-line in inode | |
142 | */ | |
143 | xtInitRoot(tid, ip); | |
144 | ||
145 | /* | |
146 | * create entry in parent directory for child directory | |
147 | * (dtInsert() releases parent directory page) | |
148 | */ | |
149 | ino = ip->i_ino; | |
150 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
151 | if (rc == -EIO) { | |
152 | jfs_err("jfs_create: dtInsert returned -EIO"); | |
153 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
154 | } else | |
155 | txAbort(tid, 0); /* Filesystem full */ | |
156 | goto out3; | |
157 | } | |
158 | ||
159 | ip->i_op = &jfs_file_inode_operations; | |
160 | ip->i_fop = &jfs_file_operations; | |
161 | ip->i_mapping->a_ops = &jfs_aops; | |
162 | ||
1da177e4 LT |
163 | mark_inode_dirty(ip); |
164 | ||
078cd827 | 165 | dip->i_ctime = dip->i_mtime = current_time(dip); |
1da177e4 LT |
166 | |
167 | mark_inode_dirty(dip); | |
168 | ||
169 | rc = txCommit(tid, 2, &iplist[0], 0); | |
170 | ||
171 | out3: | |
172 | txEnd(tid); | |
1de87444 | 173 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 174 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 175 | if (rc) { |
4f4b401b | 176 | free_ea_wmap(ip); |
6d6b77f1 | 177 | clear_nlink(ip); |
1f3403fa | 178 | unlock_new_inode(ip); |
1da177e4 | 179 | iput(ip); |
1f3403fa | 180 | } else { |
1e2e547a | 181 | d_instantiate_new(dentry, ip); |
1f3403fa | 182 | } |
1da177e4 LT |
183 | |
184 | out2: | |
185 | free_UCSname(&dname); | |
186 | ||
1da177e4 LT |
187 | out1: |
188 | ||
189 | jfs_info("jfs_create: rc:%d", rc); | |
190 | return rc; | |
191 | } | |
192 | ||
193 | ||
194 | /* | |
195 | * NAME: jfs_mkdir(dip, dentry, mode) | |
196 | * | |
197 | * FUNCTION: create a child directory in the parent directory <dip> | |
198 | * with name = <from dentry> and mode = <mode> | |
199 | * | |
63f83c9f | 200 | * PARAMETER: dip - parent directory vnode |
1da177e4 LT |
201 | * dentry - dentry of child directory |
202 | * mode - create mode (rwxrwxrwx). | |
203 | * | |
204 | * RETURN: Errors from subroutines | |
205 | * | |
206 | * note: | |
207 | * EACCESS: user needs search+write permission on the parent directory | |
208 | */ | |
18bb1db3 | 209 | static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode) |
1da177e4 LT |
210 | { |
211 | int rc = 0; | |
212 | tid_t tid; /* transaction id */ | |
213 | struct inode *ip = NULL; /* child directory inode */ | |
214 | ino_t ino; | |
215 | struct component_name dname; /* child directory name */ | |
216 | struct btstack btstack; | |
217 | struct inode *iplist[2]; | |
218 | struct tblock *tblk; | |
219 | ||
a455589f | 220 | jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry); |
1da177e4 | 221 | |
acc84b05 DK |
222 | rc = dquot_initialize(dip); |
223 | if (rc) | |
224 | goto out1; | |
907f4554 | 225 | |
1da177e4 LT |
226 | /* |
227 | * search parent directory for entry/freespace | |
228 | * (dtSearch() returns parent directory page pinned) | |
229 | */ | |
230 | if ((rc = get_UCSname(&dname, dentry))) | |
231 | goto out1; | |
232 | ||
233 | /* | |
234 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
235 | * block there while holding dtree page, so we allocate the inode & | |
236 | * begin the transaction before we search the directory. | |
237 | */ | |
238 | ip = ialloc(dip, S_IFDIR | mode); | |
087387f9 AM |
239 | if (IS_ERR(ip)) { |
240 | rc = PTR_ERR(ip); | |
1da177e4 LT |
241 | goto out2; |
242 | } | |
243 | ||
244 | tid = txBegin(dip->i_sb, 0); | |
245 | ||
82d5b9a7 DK |
246 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
247 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 248 | |
4f4b401b DK |
249 | rc = jfs_init_acl(tid, ip, dip); |
250 | if (rc) | |
251 | goto out3; | |
252 | ||
2a7dba39 | 253 | rc = jfs_init_security(tid, ip, dip, &dentry->d_name); |
1d15b10f DK |
254 | if (rc) { |
255 | txAbort(tid, 0); | |
256 | goto out3; | |
257 | } | |
258 | ||
1da177e4 LT |
259 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
260 | jfs_err("jfs_mkdir: dtSearch returned %d", rc); | |
4f4b401b | 261 | txAbort(tid, 0); |
1da177e4 LT |
262 | goto out3; |
263 | } | |
264 | ||
265 | tblk = tid_to_tblock(tid); | |
266 | tblk->xflag |= COMMIT_CREATE; | |
267 | tblk->ino = ip->i_ino; | |
268 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
269 | ||
270 | iplist[0] = dip; | |
271 | iplist[1] = ip; | |
272 | ||
273 | /* | |
274 | * initialize the child directory in-line in inode | |
275 | */ | |
276 | dtInitRoot(tid, ip, dip->i_ino); | |
277 | ||
278 | /* | |
279 | * create entry in parent directory for child directory | |
280 | * (dtInsert() releases parent directory page) | |
281 | */ | |
282 | ino = ip->i_ino; | |
283 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
284 | if (rc == -EIO) { | |
285 | jfs_err("jfs_mkdir: dtInsert returned -EIO"); | |
286 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
287 | } else | |
288 | txAbort(tid, 0); /* Filesystem full */ | |
289 | goto out3; | |
290 | } | |
291 | ||
bfe86848 | 292 | set_nlink(ip, 2); /* for '.' */ |
1da177e4 LT |
293 | ip->i_op = &jfs_dir_inode_operations; |
294 | ip->i_fop = &jfs_dir_operations; | |
295 | ||
1da177e4 LT |
296 | mark_inode_dirty(ip); |
297 | ||
298 | /* update parent directory inode */ | |
d8c76e6f | 299 | inc_nlink(dip); /* for '..' from child directory */ |
078cd827 | 300 | dip->i_ctime = dip->i_mtime = current_time(dip); |
1da177e4 LT |
301 | mark_inode_dirty(dip); |
302 | ||
303 | rc = txCommit(tid, 2, &iplist[0], 0); | |
304 | ||
305 | out3: | |
306 | txEnd(tid); | |
1de87444 | 307 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 308 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 309 | if (rc) { |
4f4b401b | 310 | free_ea_wmap(ip); |
6d6b77f1 | 311 | clear_nlink(ip); |
1f3403fa | 312 | unlock_new_inode(ip); |
1da177e4 | 313 | iput(ip); |
1f3403fa | 314 | } else { |
1e2e547a | 315 | d_instantiate_new(dentry, ip); |
1f3403fa | 316 | } |
1da177e4 LT |
317 | |
318 | out2: | |
319 | free_UCSname(&dname); | |
320 | ||
1da177e4 LT |
321 | |
322 | out1: | |
323 | ||
324 | jfs_info("jfs_mkdir: rc:%d", rc); | |
325 | return rc; | |
326 | } | |
327 | ||
328 | /* | |
329 | * NAME: jfs_rmdir(dip, dentry) | |
330 | * | |
331 | * FUNCTION: remove a link to child directory | |
332 | * | |
63f83c9f | 333 | * PARAMETER: dip - parent inode |
1da177e4 LT |
334 | * dentry - child directory dentry |
335 | * | |
336 | * RETURN: -EINVAL - if name is . or .. | |
f720e3ba | 337 | * -EINVAL - if . or .. exist but are invalid. |
1da177e4 LT |
338 | * errors from subroutines |
339 | * | |
340 | * note: | |
63f83c9f DK |
341 | * if other threads have the directory open when the last link |
342 | * is removed, the "." and ".." entries, if present, are removed before | |
343 | * rmdir() returns and no new entries may be created in the directory, | |
344 | * but the directory is not removed until the last reference to | |
1da177e4 LT |
345 | * the directory is released (cf.unlink() of regular file). |
346 | */ | |
347 | static int jfs_rmdir(struct inode *dip, struct dentry *dentry) | |
348 | { | |
349 | int rc; | |
350 | tid_t tid; /* transaction id */ | |
2b0143b5 | 351 | struct inode *ip = d_inode(dentry); |
1da177e4 LT |
352 | ino_t ino; |
353 | struct component_name dname; | |
354 | struct inode *iplist[2]; | |
355 | struct tblock *tblk; | |
356 | ||
a455589f | 357 | jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry); |
1da177e4 LT |
358 | |
359 | /* Init inode for quota operations. */ | |
acc84b05 DK |
360 | rc = dquot_initialize(dip); |
361 | if (rc) | |
362 | goto out; | |
363 | rc = dquot_initialize(ip); | |
364 | if (rc) | |
365 | goto out; | |
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 | */ | |
078cd827 | 407 | dip->i_ctime = dip->i_mtime = current_time(dip); |
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 */ | |
2b0143b5 | 481 | struct inode *ip = d_inode(dentry); |
1da177e4 LT |
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 | ||
a455589f | 489 | jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry); |
1da177e4 LT |
490 | |
491 | /* Init inode for quota operations. */ | |
acc84b05 DK |
492 | rc = dquot_initialize(dip); |
493 | if (rc) | |
494 | goto out; | |
495 | rc = dquot_initialize(ip); | |
496 | if (rc) | |
497 | goto out; | |
1da177e4 LT |
498 | |
499 | if ((rc = get_UCSname(&dname, dentry))) | |
500 | goto out; | |
501 | ||
82d5b9a7 | 502 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
503 | |
504 | tid = txBegin(dip->i_sb, 0); | |
505 | ||
82d5b9a7 DK |
506 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
507 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
508 | |
509 | iplist[0] = dip; | |
510 | iplist[1] = ip; | |
511 | ||
512 | /* | |
513 | * delete the entry of target file from parent directory | |
514 | */ | |
515 | ino = ip->i_ino; | |
516 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
517 | jfs_err("jfs_unlink: dtDelete returned %d", rc); | |
518 | if (rc == -EIO) | |
519 | txAbort(tid, 1); /* Marks FS Dirty */ | |
520 | txEnd(tid); | |
1de87444 | 521 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 522 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
523 | IWRITE_UNLOCK(ip); |
524 | goto out1; | |
525 | } | |
526 | ||
527 | ASSERT(ip->i_nlink); | |
528 | ||
078cd827 | 529 | ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip); |
1da177e4 LT |
530 | mark_inode_dirty(dip); |
531 | ||
532 | /* update target's inode */ | |
9a53c3a7 | 533 | inode_dec_link_count(ip); |
1da177e4 LT |
534 | |
535 | /* | |
f720e3ba | 536 | * commit zero link count object |
1da177e4 LT |
537 | */ |
538 | if (ip->i_nlink == 0) { | |
539 | assert(!test_cflag(COMMIT_Nolink, ip)); | |
540 | /* free block resources */ | |
541 | if ((new_size = commitZeroLink(tid, ip)) < 0) { | |
542 | txAbort(tid, 1); /* Marks FS Dirty */ | |
543 | txEnd(tid); | |
1de87444 | 544 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 545 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
546 | IWRITE_UNLOCK(ip); |
547 | rc = new_size; | |
548 | goto out1; | |
549 | } | |
550 | tblk = tid_to_tblock(tid); | |
551 | tblk->xflag |= COMMIT_DELETE; | |
552 | tblk->u.ip = ip; | |
553 | } | |
554 | ||
555 | /* | |
556 | * Incomplete truncate of file data can | |
557 | * result in timing problems unless we synchronously commit the | |
558 | * transaction. | |
559 | */ | |
560 | if (new_size) | |
561 | commit_flag = COMMIT_SYNC; | |
562 | else | |
563 | commit_flag = 0; | |
564 | ||
565 | /* | |
566 | * If xtTruncate was incomplete, commit synchronously to avoid | |
567 | * timing complications | |
568 | */ | |
569 | rc = txCommit(tid, 2, &iplist[0], commit_flag); | |
570 | ||
571 | txEnd(tid); | |
572 | ||
1de87444 | 573 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 574 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
575 | |
576 | while (new_size && (rc == 0)) { | |
577 | tid = txBegin(dip->i_sb, 0); | |
1de87444 | 578 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
579 | new_size = xtTruncate_pmap(tid, ip, new_size); |
580 | if (new_size < 0) { | |
581 | txAbort(tid, 1); /* Marks FS Dirty */ | |
582 | rc = new_size; | |
583 | } else | |
584 | rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); | |
585 | txEnd(tid); | |
1de87444 | 586 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
587 | } |
588 | ||
589 | if (ip->i_nlink == 0) | |
590 | set_cflag(COMMIT_Nolink, ip); | |
591 | ||
592 | IWRITE_UNLOCK(ip); | |
593 | ||
594 | /* | |
595 | * Truncating the directory index table is not guaranteed. It | |
596 | * may need to be done iteratively | |
597 | */ | |
598 | if (test_cflag(COMMIT_Stale, dip)) { | |
599 | if (dip->i_size > 1) | |
600 | jfs_truncate_nolock(dip, 0); | |
601 | ||
602 | clear_cflag(COMMIT_Stale, dip); | |
603 | } | |
604 | ||
605 | out1: | |
606 | free_UCSname(&dname); | |
607 | out: | |
608 | jfs_info("jfs_unlink: rc:%d", rc); | |
609 | return rc; | |
610 | } | |
611 | ||
612 | /* | |
613 | * NAME: commitZeroLink() | |
614 | * | |
f720e3ba | 615 | * FUNCTION: for non-directory, called by jfs_remove(), |
1da177e4 | 616 | * truncate a regular file, directory or symbolic |
63f83c9f | 617 | * link to zero length. return 0 if type is not |
1da177e4 LT |
618 | * one of these. |
619 | * | |
620 | * if the file is currently associated with a VM segment | |
621 | * only permanent disk and inode map resources are freed, | |
622 | * and neither the inode nor indirect blocks are modified | |
623 | * so that the resources can be later freed in the work | |
624 | * map by ctrunc1. | |
625 | * if there is no VM segment on entry, the resources are | |
626 | * freed in both work and permanent map. | |
63f83c9f | 627 | * (? for temporary file - memory object is cached even |
1da177e4 LT |
628 | * after no reference: |
629 | * reference count > 0 - ) | |
630 | * | |
631 | * PARAMETERS: cd - pointer to commit data structure. | |
632 | * current inode is the one to truncate. | |
633 | * | |
634 | * RETURN: Errors from subroutines | |
635 | */ | |
636 | static s64 commitZeroLink(tid_t tid, struct inode *ip) | |
637 | { | |
638 | int filetype; | |
639 | struct tblock *tblk; | |
640 | ||
641 | jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); | |
642 | ||
643 | filetype = ip->i_mode & S_IFMT; | |
644 | switch (filetype) { | |
645 | case S_IFREG: | |
646 | break; | |
647 | case S_IFLNK: | |
648 | /* fast symbolic link */ | |
649 | if (ip->i_size < IDATASIZE) { | |
650 | ip->i_size = 0; | |
651 | return 0; | |
652 | } | |
653 | break; | |
654 | default: | |
655 | assert(filetype != S_IFDIR); | |
656 | return 0; | |
657 | } | |
658 | ||
659 | set_cflag(COMMIT_Freewmap, ip); | |
660 | ||
661 | /* mark transaction of block map update type */ | |
662 | tblk = tid_to_tblock(tid); | |
663 | tblk->xflag |= COMMIT_PMAP; | |
664 | ||
665 | /* | |
666 | * free EA | |
667 | */ | |
668 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) | |
669 | /* acquire maplock on EA to be freed from block map */ | |
670 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
671 | ||
672 | /* | |
673 | * free ACL | |
674 | */ | |
675 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) | |
676 | /* acquire maplock on EA to be freed from block map */ | |
677 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
678 | ||
679 | /* | |
680 | * free xtree/data (truncate to zero length): | |
63f83c9f | 681 | * free xtree/data pages from cache if COMMIT_PWMAP, |
1da177e4 LT |
682 | * free xtree/data blocks from persistent block map, and |
683 | * free xtree/data blocks from working block map if COMMIT_PWMAP; | |
684 | */ | |
685 | if (ip->i_size) | |
686 | return xtTruncate_pmap(tid, ip, 0); | |
687 | ||
688 | return 0; | |
689 | } | |
690 | ||
691 | ||
692 | /* | |
1868f4aa | 693 | * NAME: jfs_free_zero_link() |
1da177e4 | 694 | * |
f720e3ba | 695 | * FUNCTION: for non-directory, called by iClose(), |
63f83c9f | 696 | * free resources of a file from cache and WORKING map |
1da177e4 LT |
697 | * for a file previously committed with zero link count |
698 | * while associated with a pager object, | |
699 | * | |
700 | * PARAMETER: ip - pointer to inode of file. | |
1da177e4 | 701 | */ |
1868f4aa | 702 | void jfs_free_zero_link(struct inode *ip) |
1da177e4 | 703 | { |
1da177e4 LT |
704 | int type; |
705 | ||
1868f4aa | 706 | jfs_info("jfs_free_zero_link: ip = 0x%p", ip); |
1da177e4 LT |
707 | |
708 | /* return if not reg or symbolic link or if size is | |
709 | * already ok. | |
710 | */ | |
711 | type = ip->i_mode & S_IFMT; | |
712 | ||
713 | switch (type) { | |
714 | case S_IFREG: | |
715 | break; | |
716 | case S_IFLNK: | |
717 | /* if its contained in inode nothing to do */ | |
718 | if (ip->i_size < IDATASIZE) | |
1868f4aa | 719 | return; |
1da177e4 LT |
720 | break; |
721 | default: | |
1868f4aa | 722 | return; |
1da177e4 LT |
723 | } |
724 | ||
725 | /* | |
726 | * free EA | |
727 | */ | |
728 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
729 | s64 xaddr = addressDXD(&JFS_IP(ip)->ea); | |
730 | int xlen = lengthDXD(&JFS_IP(ip)->ea); | |
731 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
732 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
733 | ||
734 | /* free EA pages from cache */ | |
735 | invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); | |
736 | ||
737 | /* free EA extent from working block map */ | |
738 | maplock.index = 1; | |
739 | pxdlock = (struct pxd_lock *) & maplock; | |
740 | pxdlock->flag = mlckFREEPXD; | |
741 | PXDaddress(&pxdlock->pxd, xaddr); | |
742 | PXDlength(&pxdlock->pxd, xlen); | |
743 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
744 | } | |
745 | ||
746 | /* | |
747 | * free ACL | |
748 | */ | |
749 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
750 | s64 xaddr = addressDXD(&JFS_IP(ip)->acl); | |
751 | int xlen = lengthDXD(&JFS_IP(ip)->acl); | |
752 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
753 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
754 | ||
755 | invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); | |
756 | ||
757 | /* free ACL extent from working block map */ | |
758 | maplock.index = 1; | |
759 | pxdlock = (struct pxd_lock *) & maplock; | |
760 | pxdlock->flag = mlckFREEPXD; | |
761 | PXDaddress(&pxdlock->pxd, xaddr); | |
762 | PXDlength(&pxdlock->pxd, xlen); | |
763 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
764 | } | |
765 | ||
766 | /* | |
767 | * free xtree/data (truncate to zero length): | |
768 | * free xtree/data pages from cache, and | |
769 | * free xtree/data blocks from working block map; | |
770 | */ | |
771 | if (ip->i_size) | |
1868f4aa | 772 | xtTruncate(0, ip, 0, COMMIT_WMAP); |
1da177e4 LT |
773 | } |
774 | ||
775 | /* | |
776 | * NAME: jfs_link(vp, dvp, name, crp) | |
777 | * | |
778 | * FUNCTION: create a link to <vp> by the name = <name> | |
779 | * in the parent directory <dvp> | |
780 | * | |
63f83c9f | 781 | * PARAMETER: vp - target object |
1da177e4 LT |
782 | * dvp - parent directory of new link |
783 | * name - name of new link to target object | |
784 | * crp - credential | |
785 | * | |
786 | * RETURN: Errors from subroutines | |
787 | * | |
788 | * note: | |
789 | * JFS does NOT support link() on directories (to prevent circular | |
790 | * path in the directory hierarchy); | |
791 | * EPERM: the target object is a directory, and either the caller | |
792 | * does not have appropriate privileges or the implementation prohibits | |
793 | * using link() on directories [XPG4.2]. | |
794 | * | |
795 | * JFS does NOT support links between file systems: | |
796 | * EXDEV: target object and new link are on different file systems and | |
797 | * implementation does not support links between file systems [XPG4.2]. | |
798 | */ | |
799 | static int jfs_link(struct dentry *old_dentry, | |
800 | struct inode *dir, struct dentry *dentry) | |
801 | { | |
802 | int rc; | |
803 | tid_t tid; | |
2b0143b5 | 804 | struct inode *ip = d_inode(old_dentry); |
1da177e4 LT |
805 | ino_t ino; |
806 | struct component_name dname; | |
807 | struct btstack btstack; | |
808 | struct inode *iplist[2]; | |
809 | ||
a455589f | 810 | jfs_info("jfs_link: %pd %pd", old_dentry, dentry); |
1da177e4 | 811 | |
acc84b05 DK |
812 | rc = dquot_initialize(dir); |
813 | if (rc) | |
814 | goto out; | |
907f4554 | 815 | |
1da177e4 LT |
816 | tid = txBegin(ip->i_sb, 0); |
817 | ||
82d5b9a7 DK |
818 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
819 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
820 | |
821 | /* | |
822 | * scan parent directory for entry/freespace | |
823 | */ | |
824 | if ((rc = get_UCSname(&dname, dentry))) | |
acc84b05 | 825 | goto out_tx; |
1da177e4 LT |
826 | |
827 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) | |
828 | goto free_dname; | |
829 | ||
830 | /* | |
831 | * create entry for new link in parent directory | |
832 | */ | |
833 | ino = ip->i_ino; | |
834 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) | |
835 | goto free_dname; | |
836 | ||
837 | /* update object inode */ | |
d8c76e6f | 838 | inc_nlink(ip); /* for new link */ |
078cd827 DD |
839 | ip->i_ctime = current_time(ip); |
840 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
1da177e4 | 841 | mark_inode_dirty(dir); |
7de9c6ee | 842 | ihold(ip); |
1da177e4 LT |
843 | |
844 | iplist[0] = ip; | |
845 | iplist[1] = dir; | |
846 | rc = txCommit(tid, 2, &iplist[0], 0); | |
847 | ||
848 | if (rc) { | |
6d6b77f1 | 849 | drop_nlink(ip); /* never instantiated */ |
1da177e4 LT |
850 | iput(ip); |
851 | } else | |
852 | d_instantiate(dentry, ip); | |
853 | ||
854 | free_dname: | |
855 | free_UCSname(&dname); | |
856 | ||
acc84b05 | 857 | out_tx: |
1da177e4 LT |
858 | txEnd(tid); |
859 | ||
1de87444 | 860 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 861 | mutex_unlock(&JFS_IP(dir)->commit_mutex); |
1da177e4 | 862 | |
acc84b05 | 863 | out: |
1da177e4 LT |
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; | |
2b0143b5 | 895 | struct inode *ip = d_inode(dentry); |
1da177e4 LT |
896 | s64 xlen = 0; |
897 | int bmask = 0, xsize; | |
3c2c2262 | 898 | s64 xaddr; |
1da177e4 LT |
899 | struct metapage *mp; |
900 | struct super_block *sb; | |
901 | struct tblock *tblk; | |
902 | ||
903 | struct inode *iplist[2]; | |
904 | ||
905 | jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); | |
906 | ||
acc84b05 DK |
907 | rc = dquot_initialize(dip); |
908 | if (rc) | |
909 | goto out1; | |
907f4554 | 910 | |
1da177e4 LT |
911 | ssize = strlen(name) + 1; |
912 | ||
913 | /* | |
914 | * search parent directory for entry/freespace | |
915 | * (dtSearch() returns parent directory page pinned) | |
916 | */ | |
917 | ||
918 | if ((rc = get_UCSname(&dname, dentry))) | |
919 | goto out1; | |
920 | ||
921 | /* | |
922 | * allocate on-disk/in-memory inode for symbolic link: | |
923 | * (iAlloc() returns new, locked inode) | |
924 | */ | |
925 | ip = ialloc(dip, S_IFLNK | 0777); | |
087387f9 AM |
926 | if (IS_ERR(ip)) { |
927 | rc = PTR_ERR(ip); | |
1da177e4 LT |
928 | goto out2; |
929 | } | |
930 | ||
931 | tid = txBegin(dip->i_sb, 0); | |
932 | ||
82d5b9a7 DK |
933 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
934 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 935 | |
2a7dba39 | 936 | rc = jfs_init_security(tid, ip, dip, &dentry->d_name); |
1d15b10f DK |
937 | if (rc) |
938 | goto out3; | |
939 | ||
1da177e4 LT |
940 | tblk = tid_to_tblock(tid); |
941 | tblk->xflag |= COMMIT_CREATE; | |
942 | tblk->ino = ip->i_ino; | |
943 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
944 | ||
945 | /* fix symlink access permission | |
63f83c9f | 946 | * (dir_create() ANDs in the u.u_cmask, |
1da177e4 LT |
947 | * but symlinks really need to be 777 access) |
948 | */ | |
949 | ip->i_mode |= 0777; | |
950 | ||
951 | /* | |
952 | * write symbolic link target path name | |
953 | */ | |
954 | xtInitRoot(tid, ip); | |
955 | ||
956 | /* | |
957 | * write source path name inline in on-disk inode (fast symbolic link) | |
958 | */ | |
959 | ||
960 | if (ssize <= IDATASIZE) { | |
c7f2e1f0 | 961 | ip->i_op = &jfs_fast_symlink_inode_operations; |
1da177e4 | 962 | |
ad476fed AV |
963 | ip->i_link = JFS_IP(ip)->i_inline; |
964 | memcpy(ip->i_link, name, ssize); | |
1da177e4 LT |
965 | ip->i_size = ssize - 1; |
966 | ||
967 | /* | |
968 | * if symlink is > 128 bytes, we don't have the space to | |
969 | * store inline extended attributes | |
970 | */ | |
971 | if (ssize > sizeof (JFS_IP(ip)->i_inline)) | |
972 | JFS_IP(ip)->mode2 &= ~INLINEEA; | |
973 | ||
974 | jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", | |
975 | ssize, name); | |
976 | } | |
977 | /* | |
978 | * write source path name in a single extent | |
979 | */ | |
980 | else { | |
981 | jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); | |
982 | ||
c7f2e1f0 | 983 | ip->i_op = &jfs_symlink_inode_operations; |
21fc61c7 | 984 | inode_nohighmem(ip); |
1da177e4 LT |
985 | ip->i_mapping->a_ops = &jfs_aops; |
986 | ||
987 | /* | |
63f83c9f | 988 | * even though the data of symlink object (source |
1da177e4 LT |
989 | * path name) is treated as non-journaled user data, |
990 | * it is read/written thru buffer cache for performance. | |
991 | */ | |
992 | sb = ip->i_sb; | |
993 | bmask = JFS_SBI(sb)->bsize - 1; | |
994 | xsize = (ssize + bmask) & ~bmask; | |
995 | xaddr = 0; | |
996 | xlen = xsize >> JFS_SBI(sb)->l2bsize; | |
997 | if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { | |
998 | txAbort(tid, 0); | |
1da177e4 LT |
999 | goto out3; |
1000 | } | |
1da177e4 LT |
1001 | ip->i_size = ssize - 1; |
1002 | while (ssize) { | |
1003 | /* This is kind of silly since PATH_MAX == 4K */ | |
1004 | int copy_size = min(ssize, PSIZE); | |
1005 | ||
1006 | mp = get_metapage(ip, xaddr, PSIZE, 1); | |
1007 | ||
1008 | if (mp == NULL) { | |
1009 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
1010 | rc = -EIO; | |
1011 | txAbort(tid, 0); | |
1012 | goto out3; | |
1013 | } | |
1014 | memcpy(mp->data, name, copy_size); | |
1015 | flush_metapage(mp); | |
1016 | ssize -= copy_size; | |
1017 | name += copy_size; | |
1018 | xaddr += JFS_SBI(sb)->nbperpage; | |
1019 | } | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * create entry for symbolic link in parent directory | |
1024 | */ | |
1025 | rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); | |
1026 | if (rc == 0) { | |
1027 | ino = ip->i_ino; | |
1028 | rc = dtInsert(tid, dip, &dname, &ino, &btstack); | |
1029 | } | |
1030 | if (rc) { | |
1031 | if (xlen) | |
1032 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
1033 | txAbort(tid, 0); | |
1034 | /* discard new inode */ | |
1035 | goto out3; | |
1036 | } | |
1037 | ||
1da177e4 LT |
1038 | mark_inode_dirty(ip); |
1039 | ||
078cd827 | 1040 | dip->i_ctime = dip->i_mtime = current_time(dip); |
988a6490 | 1041 | mark_inode_dirty(dip); |
1da177e4 LT |
1042 | /* |
1043 | * commit update of parent directory and link object | |
1044 | */ | |
1045 | ||
1046 | iplist[0] = dip; | |
1047 | iplist[1] = ip; | |
1048 | rc = txCommit(tid, 2, &iplist[0], 0); | |
1049 | ||
1050 | out3: | |
1051 | txEnd(tid); | |
1de87444 | 1052 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 1053 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 1054 | if (rc) { |
4f4b401b | 1055 | free_ea_wmap(ip); |
6d6b77f1 | 1056 | clear_nlink(ip); |
1f3403fa | 1057 | unlock_new_inode(ip); |
1da177e4 | 1058 | iput(ip); |
1f3403fa | 1059 | } else { |
1e2e547a | 1060 | d_instantiate_new(dentry, ip); |
1f3403fa | 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, | |
f03b8ad8 MS |
1078 | struct inode *new_dir, struct dentry *new_dentry, |
1079 | unsigned int flags) | |
1da177e4 LT |
1080 | { |
1081 | struct btstack btstack; | |
1082 | ino_t ino; | |
1083 | struct component_name new_dname; | |
1084 | struct inode *new_ip; | |
1085 | struct component_name old_dname; | |
1086 | struct inode *old_ip; | |
1087 | int rc; | |
1088 | tid_t tid; | |
1089 | struct tlock *tlck; | |
1090 | struct dt_lock *dtlck; | |
1091 | struct lv *lv; | |
1092 | int ipcount; | |
1093 | struct inode *iplist[4]; | |
1094 | struct tblock *tblk; | |
1095 | s64 new_size = 0; | |
1096 | int commit_flag; | |
1097 | ||
f03b8ad8 MS |
1098 | if (flags & ~RENAME_NOREPLACE) |
1099 | return -EINVAL; | |
1da177e4 | 1100 | |
a455589f | 1101 | jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry); |
1da177e4 | 1102 | |
acc84b05 DK |
1103 | rc = dquot_initialize(old_dir); |
1104 | if (rc) | |
1105 | goto out1; | |
1106 | rc = dquot_initialize(new_dir); | |
1107 | if (rc) | |
1108 | goto out1; | |
907f4554 | 1109 | |
2b0143b5 DH |
1110 | old_ip = d_inode(old_dentry); |
1111 | new_ip = d_inode(new_dentry); | |
1da177e4 LT |
1112 | |
1113 | if ((rc = get_UCSname(&old_dname, old_dentry))) | |
1114 | goto out1; | |
1115 | ||
1116 | if ((rc = get_UCSname(&new_dname, new_dentry))) | |
1117 | goto out2; | |
1118 | ||
1119 | /* | |
1120 | * Make sure source inode number is what we think it is | |
1121 | */ | |
1122 | rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); | |
1123 | if (rc || (ino != old_ip->i_ino)) { | |
1124 | rc = -ENOENT; | |
1125 | goto out3; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * Make sure dest inode number (if any) is what we think it is | |
1130 | */ | |
1131 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); | |
09aaa749 | 1132 | if (!rc) { |
da8a41d1 | 1133 | if ((!new_ip) || (ino != new_ip->i_ino)) { |
1da177e4 LT |
1134 | rc = -ESTALE; |
1135 | goto out3; | |
1136 | } | |
1137 | } else if (rc != -ENOENT) | |
1138 | goto out3; | |
1139 | else if (new_ip) { | |
1140 | /* no entry exists, but one was expected */ | |
1141 | rc = -ESTALE; | |
1142 | goto out3; | |
1143 | } | |
1144 | ||
1145 | if (S_ISDIR(old_ip->i_mode)) { | |
1146 | if (new_ip) { | |
1147 | if (!dtEmpty(new_ip)) { | |
1148 | rc = -ENOTEMPTY; | |
1149 | goto out3; | |
1150 | } | |
1da177e4 LT |
1151 | } |
1152 | } else if (new_ip) { | |
82d5b9a7 | 1153 | IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); |
1da177e4 | 1154 | /* Init inode for quota operations. */ |
acc84b05 DK |
1155 | rc = dquot_initialize(new_ip); |
1156 | if (rc) | |
1157 | goto out_unlock; | |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | /* | |
1161 | * The real work starts here | |
1162 | */ | |
1163 | tid = txBegin(new_dir->i_sb, 0); | |
1164 | ||
82d5b9a7 DK |
1165 | /* |
1166 | * How do we know the locking is safe from deadlocks? | |
1167 | * The vfs does the hard part for us. Any time we are taking nested | |
1168 | * commit_mutexes, the vfs already has i_mutex held on the parent. | |
1169 | * Here, the vfs has already taken i_mutex on both old_dir and new_dir. | |
1170 | */ | |
1171 | mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); | |
1172 | mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 1173 | if (old_dir != new_dir) |
82d5b9a7 DK |
1174 | mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, |
1175 | COMMIT_MUTEX_SECOND_PARENT); | |
1da177e4 LT |
1176 | |
1177 | if (new_ip) { | |
82d5b9a7 DK |
1178 | mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, |
1179 | COMMIT_MUTEX_VICTIM); | |
1da177e4 LT |
1180 | /* |
1181 | * Change existing directory entry to new inode number | |
1182 | */ | |
1183 | ino = new_ip->i_ino; | |
1184 | rc = dtModify(tid, new_dir, &new_dname, &ino, | |
1185 | old_ip->i_ino, JFS_RENAME); | |
1186 | if (rc) | |
26456955 | 1187 | goto out_tx; |
9a53c3a7 | 1188 | drop_nlink(new_ip); |
1da177e4 | 1189 | if (S_ISDIR(new_ip->i_mode)) { |
9a53c3a7 | 1190 | drop_nlink(new_ip); |
1da177e4 | 1191 | if (new_ip->i_nlink) { |
48ce8b05 | 1192 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 | 1193 | if (old_dir != new_dir) |
1de87444 | 1194 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); |
48ce8b05 ED |
1195 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); |
1196 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); | |
1da177e4 LT |
1197 | if (!S_ISDIR(old_ip->i_mode) && new_ip) |
1198 | IWRITE_UNLOCK(new_ip); | |
1199 | jfs_error(new_ip->i_sb, | |
eb8630d7 | 1200 | "new_ip->i_nlink != 0\n"); |
1da177e4 LT |
1201 | return -EIO; |
1202 | } | |
1203 | tblk = tid_to_tblock(tid); | |
1204 | tblk->xflag |= COMMIT_DELETE; | |
1205 | tblk->u.ip = new_ip; | |
1206 | } else if (new_ip->i_nlink == 0) { | |
1207 | assert(!test_cflag(COMMIT_Nolink, new_ip)); | |
1208 | /* free block resources */ | |
1209 | if ((new_size = commitZeroLink(tid, new_ip)) < 0) { | |
1210 | txAbort(tid, 1); /* Marks FS Dirty */ | |
63f83c9f | 1211 | rc = new_size; |
26456955 | 1212 | goto out_tx; |
1da177e4 LT |
1213 | } |
1214 | tblk = tid_to_tblock(tid); | |
1215 | tblk->xflag |= COMMIT_DELETE; | |
1216 | tblk->u.ip = new_ip; | |
1217 | } else { | |
078cd827 | 1218 | new_ip->i_ctime = current_time(new_ip); |
1da177e4 LT |
1219 | mark_inode_dirty(new_ip); |
1220 | } | |
1221 | } else { | |
1222 | /* | |
1223 | * Add new directory entry | |
1224 | */ | |
1225 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, | |
1226 | JFS_CREATE); | |
1227 | if (rc) { | |
6ed71e98 JP |
1228 | jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d", |
1229 | rc); | |
26456955 | 1230 | goto out_tx; |
1da177e4 LT |
1231 | } |
1232 | ||
1233 | ino = old_ip->i_ino; | |
1234 | rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); | |
1235 | if (rc) { | |
1236 | if (rc == -EIO) | |
1237 | jfs_err("jfs_rename: dtInsert returned -EIO"); | |
26456955 | 1238 | goto out_tx; |
1da177e4 LT |
1239 | } |
1240 | if (S_ISDIR(old_ip->i_mode)) | |
d8c76e6f | 1241 | inc_nlink(new_dir); |
1da177e4 LT |
1242 | } |
1243 | /* | |
1244 | * Remove old directory entry | |
1245 | */ | |
1246 | ||
1247 | ino = old_ip->i_ino; | |
1248 | rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); | |
1249 | if (rc) { | |
1250 | jfs_err("jfs_rename did not expect dtDelete to return rc = %d", | |
1251 | rc); | |
1252 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
26456955 | 1253 | goto out_tx; |
1da177e4 LT |
1254 | } |
1255 | if (S_ISDIR(old_ip->i_mode)) { | |
9a53c3a7 | 1256 | drop_nlink(old_dir); |
1da177e4 LT |
1257 | if (old_dir != new_dir) { |
1258 | /* | |
1259 | * Change inode number of parent for moved directory | |
1260 | */ | |
1261 | ||
1262 | JFS_IP(old_ip)->i_dtroot.header.idotdot = | |
1263 | cpu_to_le32(new_dir->i_ino); | |
1264 | ||
1265 | /* Linelock header of dtree */ | |
1266 | tlck = txLock(tid, old_ip, | |
1267 | (struct metapage *) &JFS_IP(old_ip)->bxflag, | |
1268 | tlckDTREE | tlckBTROOT | tlckRELINK); | |
1269 | dtlck = (struct dt_lock *) & tlck->lock; | |
1270 | ASSERT(dtlck->index == 0); | |
1271 | lv = & dtlck->lv[0]; | |
1272 | lv->offset = 0; | |
1273 | lv->length = 1; | |
1274 | dtlck->index++; | |
1275 | } | |
1276 | } | |
1277 | ||
1278 | /* | |
1279 | * Update ctime on changed/moved inodes & mark dirty | |
1280 | */ | |
078cd827 | 1281 | old_ip->i_ctime = current_time(old_ip); |
1da177e4 LT |
1282 | mark_inode_dirty(old_ip); |
1283 | ||
c2050a45 | 1284 | new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); |
1da177e4 LT |
1285 | mark_inode_dirty(new_dir); |
1286 | ||
1287 | /* Build list of inodes modified by this transaction */ | |
1288 | ipcount = 0; | |
1289 | iplist[ipcount++] = old_ip; | |
1290 | if (new_ip) | |
1291 | iplist[ipcount++] = new_ip; | |
1292 | iplist[ipcount++] = old_dir; | |
1293 | ||
1294 | if (old_dir != new_dir) { | |
1295 | iplist[ipcount++] = new_dir; | |
078cd827 | 1296 | old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); |
1da177e4 LT |
1297 | mark_inode_dirty(old_dir); |
1298 | } | |
1299 | ||
1300 | /* | |
1301 | * Incomplete truncate of file data can | |
1302 | * result in timing problems unless we synchronously commit the | |
1303 | * transaction. | |
1304 | */ | |
1305 | if (new_size) | |
1306 | commit_flag = COMMIT_SYNC; | |
1307 | else | |
1308 | commit_flag = 0; | |
1309 | ||
1310 | rc = txCommit(tid, ipcount, iplist, commit_flag); | |
1311 | ||
26456955 | 1312 | out_tx: |
1da177e4 | 1313 | txEnd(tid); |
1da177e4 | 1314 | if (new_ip) |
1de87444 | 1315 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
48ce8b05 ED |
1316 | if (old_dir != new_dir) |
1317 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); | |
1318 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); | |
1319 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); | |
1da177e4 LT |
1320 | |
1321 | while (new_size && (rc == 0)) { | |
1322 | tid = txBegin(new_ip->i_sb, 0); | |
1de87444 | 1323 | mutex_lock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 LT |
1324 | new_size = xtTruncate_pmap(tid, new_ip, new_size); |
1325 | if (new_size < 0) { | |
1326 | txAbort(tid, 1); | |
63f83c9f | 1327 | rc = new_size; |
1da177e4 LT |
1328 | } else |
1329 | rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); | |
1330 | txEnd(tid); | |
1de87444 | 1331 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 LT |
1332 | } |
1333 | if (new_ip && (new_ip->i_nlink == 0)) | |
1334 | set_cflag(COMMIT_Nolink, new_ip); | |
1da177e4 LT |
1335 | /* |
1336 | * Truncating the directory index table is not guaranteed. It | |
1337 | * may need to be done iteratively | |
1338 | */ | |
1339 | if (test_cflag(COMMIT_Stale, old_dir)) { | |
1340 | if (old_dir->i_size > 1) | |
1341 | jfs_truncate_nolock(old_dir, 0); | |
1342 | ||
1343 | clear_cflag(COMMIT_Stale, old_dir); | |
1344 | } | |
acc84b05 | 1345 | out_unlock: |
26456955 DK |
1346 | if (new_ip && !S_ISDIR(new_ip->i_mode)) |
1347 | IWRITE_UNLOCK(new_ip); | |
1348 | out3: | |
1349 | free_UCSname(&new_dname); | |
1350 | out2: | |
1351 | free_UCSname(&old_dname); | |
1352 | out1: | |
1da177e4 LT |
1353 | jfs_info("jfs_rename: returning %d", rc); |
1354 | return rc; | |
1355 | } | |
1356 | ||
1357 | ||
1358 | /* | |
f720e3ba | 1359 | * NAME: jfs_mknod |
1da177e4 | 1360 | * |
f720e3ba | 1361 | * FUNCTION: Create a special file (device) |
1da177e4 LT |
1362 | */ |
1363 | static int jfs_mknod(struct inode *dir, struct dentry *dentry, | |
1a67aafb | 1364 | umode_t mode, dev_t rdev) |
1da177e4 LT |
1365 | { |
1366 | struct jfs_inode_info *jfs_ip; | |
1367 | struct btstack btstack; | |
1368 | struct component_name dname; | |
1369 | ino_t ino; | |
1370 | struct inode *ip; | |
1371 | struct inode *iplist[2]; | |
1372 | int rc; | |
1373 | tid_t tid; | |
1374 | struct tblock *tblk; | |
1375 | ||
a455589f | 1376 | jfs_info("jfs_mknod: %pd", dentry); |
1da177e4 | 1377 | |
acc84b05 DK |
1378 | rc = dquot_initialize(dir); |
1379 | if (rc) | |
1380 | goto out; | |
907f4554 | 1381 | |
1da177e4 LT |
1382 | if ((rc = get_UCSname(&dname, dentry))) |
1383 | goto out; | |
1384 | ||
1385 | ip = ialloc(dir, mode); | |
087387f9 AM |
1386 | if (IS_ERR(ip)) { |
1387 | rc = PTR_ERR(ip); | |
1da177e4 LT |
1388 | goto out1; |
1389 | } | |
1390 | jfs_ip = JFS_IP(ip); | |
1391 | ||
1392 | tid = txBegin(dir->i_sb, 0); | |
1393 | ||
82d5b9a7 DK |
1394 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
1395 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 1396 | |
4f4b401b DK |
1397 | rc = jfs_init_acl(tid, ip, dir); |
1398 | if (rc) | |
1da177e4 LT |
1399 | goto out3; |
1400 | ||
2a7dba39 | 1401 | rc = jfs_init_security(tid, ip, dir, &dentry->d_name); |
1d15b10f DK |
1402 | if (rc) { |
1403 | txAbort(tid, 0); | |
1404 | goto out3; | |
1405 | } | |
1406 | ||
4f4b401b DK |
1407 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { |
1408 | txAbort(tid, 0); | |
1409 | goto out3; | |
1410 | } | |
1411 | ||
1da177e4 LT |
1412 | tblk = tid_to_tblock(tid); |
1413 | tblk->xflag |= COMMIT_CREATE; | |
1414 | tblk->ino = ip->i_ino; | |
1415 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
1416 | ||
1417 | ino = ip->i_ino; | |
4f4b401b DK |
1418 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { |
1419 | txAbort(tid, 0); | |
1da177e4 | 1420 | goto out3; |
4f4b401b | 1421 | } |
1da177e4 LT |
1422 | |
1423 | ip->i_op = &jfs_file_inode_operations; | |
1424 | jfs_ip->dev = new_encode_dev(rdev); | |
1425 | init_special_inode(ip, ip->i_mode, rdev); | |
1426 | ||
1da177e4 LT |
1427 | mark_inode_dirty(ip); |
1428 | ||
078cd827 | 1429 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4 LT |
1430 | |
1431 | mark_inode_dirty(dir); | |
1432 | ||
1433 | iplist[0] = dir; | |
1434 | iplist[1] = ip; | |
1435 | rc = txCommit(tid, 2, iplist, 0); | |
1436 | ||
1437 | out3: | |
1438 | txEnd(tid); | |
1de87444 IM |
1439 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1440 | mutex_unlock(&JFS_IP(dir)->commit_mutex); | |
1da177e4 | 1441 | if (rc) { |
4f4b401b | 1442 | free_ea_wmap(ip); |
6d6b77f1 | 1443 | clear_nlink(ip); |
1f3403fa | 1444 | unlock_new_inode(ip); |
1da177e4 | 1445 | iput(ip); |
1f3403fa | 1446 | } else { |
1e2e547a | 1447 | d_instantiate_new(dentry, ip); |
1f3403fa | 1448 | } |
1da177e4 LT |
1449 | |
1450 | out1: | |
1451 | free_UCSname(&dname); | |
1452 | ||
1da177e4 LT |
1453 | out: |
1454 | jfs_info("jfs_mknod: returning %d", rc); | |
1455 | return rc; | |
1456 | } | |
1457 | ||
00cd8dd3 | 1458 | static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1459 | { |
1460 | struct btstack btstack; | |
1461 | ino_t inum; | |
1462 | struct inode *ip; | |
1463 | struct component_name key; | |
1da177e4 LT |
1464 | int rc; |
1465 | ||
a455589f | 1466 | jfs_info("jfs_lookup: name = %pd", dentry); |
79ac5a46 AV |
1467 | |
1468 | if ((rc = get_UCSname(&key, dentry))) | |
1469 | return ERR_PTR(rc); | |
1470 | rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); | |
1471 | free_UCSname(&key); | |
1472 | if (rc == -ENOENT) { | |
1473 | ip = NULL; | |
1474 | } else if (rc) { | |
1475 | jfs_err("jfs_lookup: dtSearch returned %d", rc); | |
1476 | ip = ERR_PTR(rc); | |
1477 | } else { | |
1478 | ip = jfs_iget(dip->i_sb, inum); | |
1479 | if (IS_ERR(ip)) | |
1480 | jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum); | |
1da177e4 LT |
1481 | } |
1482 | ||
94b77bd8 | 1483 | return d_splice_alias(ip, dentry); |
1da177e4 LT |
1484 | } |
1485 | ||
d425de70 CH |
1486 | static struct inode *jfs_nfs_get_inode(struct super_block *sb, |
1487 | u64 ino, u32 generation) | |
5ca29607 | 1488 | { |
5ca29607 | 1489 | struct inode *inode; |
5ca29607 CH |
1490 | |
1491 | if (ino == 0) | |
1492 | return ERR_PTR(-ESTALE); | |
eab1df71 DH |
1493 | inode = jfs_iget(sb, ino); |
1494 | if (IS_ERR(inode)) | |
1495 | return ERR_CAST(inode); | |
5ca29607 | 1496 | |
eab1df71 | 1497 | if (generation && inode->i_generation != generation) { |
d425de70 CH |
1498 | iput(inode); |
1499 | return ERR_PTR(-ESTALE); | |
5ca29607 CH |
1500 | } |
1501 | ||
d425de70 CH |
1502 | return inode; |
1503 | } | |
5ca29607 | 1504 | |
d425de70 CH |
1505 | struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
1506 | int fh_len, int fh_type) | |
1507 | { | |
1508 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
1509 | jfs_nfs_get_inode); | |
1510 | } | |
1511 | ||
1512 | struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
1513 | int fh_len, int fh_type) | |
1514 | { | |
1515 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
1516 | jfs_nfs_get_inode); | |
5ca29607 CH |
1517 | } |
1518 | ||
1da177e4 LT |
1519 | struct dentry *jfs_get_parent(struct dentry *dentry) |
1520 | { | |
1da177e4 LT |
1521 | unsigned long parent_ino; |
1522 | ||
1523 | parent_ino = | |
2b0143b5 | 1524 | le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot); |
1da177e4 | 1525 | |
fc64005c | 1526 | return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino)); |
1da177e4 LT |
1527 | } |
1528 | ||
92e1d5be | 1529 | const struct inode_operations jfs_dir_inode_operations = { |
1da177e4 LT |
1530 | .create = jfs_create, |
1531 | .lookup = jfs_lookup, | |
1532 | .link = jfs_link, | |
1533 | .unlink = jfs_unlink, | |
1534 | .symlink = jfs_symlink, | |
1535 | .mkdir = jfs_mkdir, | |
1536 | .rmdir = jfs_rmdir, | |
1537 | .mknod = jfs_mknod, | |
1538 | .rename = jfs_rename, | |
1da177e4 | 1539 | .listxattr = jfs_listxattr, |
1da177e4 | 1540 | .setattr = jfs_setattr, |
759bfee6 | 1541 | #ifdef CONFIG_JFS_POSIX_ACL |
4e34e719 | 1542 | .get_acl = jfs_get_acl, |
2cc6a5a0 | 1543 | .set_acl = jfs_set_acl, |
1da177e4 LT |
1544 | #endif |
1545 | }; | |
1546 | ||
4b6f5d20 | 1547 | const struct file_operations jfs_dir_operations = { |
1da177e4 | 1548 | .read = generic_read_dir, |
070a0ebf | 1549 | .iterate = jfs_readdir, |
1da177e4 | 1550 | .fsync = jfs_fsync, |
baab81fa | 1551 | .unlocked_ioctl = jfs_ioctl, |
ef1fc2f0 AK |
1552 | #ifdef CONFIG_COMPAT |
1553 | .compat_ioctl = jfs_compat_ioctl, | |
1554 | #endif | |
3222a3e5 | 1555 | .llseek = generic_file_llseek, |
1da177e4 LT |
1556 | }; |
1557 | ||
da53be12 | 1558 | static int jfs_ci_hash(const struct dentry *dir, struct qstr *this) |
1da177e4 LT |
1559 | { |
1560 | unsigned long hash; | |
1561 | int i; | |
1562 | ||
8387ff25 | 1563 | hash = init_name_hash(dir); |
1da177e4 LT |
1564 | for (i=0; i < this->len; i++) |
1565 | hash = partial_name_hash(tolower(this->name[i]), hash); | |
1566 | this->hash = end_name_hash(hash); | |
1567 | ||
1568 | return 0; | |
1569 | } | |
1570 | ||
6fa67e70 | 1571 | static int jfs_ci_compare(const struct dentry *dentry, |
621e155a | 1572 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 LT |
1573 | { |
1574 | int i, result = 1; | |
1575 | ||
621e155a | 1576 | if (len != name->len) |
1da177e4 | 1577 | goto out; |
621e155a NP |
1578 | for (i=0; i < len; i++) { |
1579 | if (tolower(str[i]) != tolower(name->name[i])) | |
1da177e4 LT |
1580 | goto out; |
1581 | } | |
1582 | result = 0; | |
2bc334dc NP |
1583 | out: |
1584 | return result; | |
1585 | } | |
1da177e4 | 1586 | |
0b728e19 | 1587 | static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags) |
2bc334dc | 1588 | { |
1da177e4 | 1589 | /* |
2bc334dc NP |
1590 | * This is not negative dentry. Always valid. |
1591 | * | |
1592 | * Note, rename() to existing directory entry will have ->d_inode, | |
1593 | * and will use existing name which isn't specified name by user. | |
1594 | * | |
1595 | * We may be able to drop this positive dentry here. But dropping | |
1596 | * positive dentry isn't good idea. So it's unsupported like | |
1597 | * rename("filename", "FILENAME") for now. | |
1da177e4 | 1598 | */ |
2b0143b5 | 1599 | if (d_really_is_positive(dentry)) |
2bc334dc NP |
1600 | return 1; |
1601 | ||
1602 | /* | |
1603 | * This may be nfsd (or something), anyway, we can't see the | |
1604 | * intent of this. So, since this can be for creation, drop it. | |
1605 | */ | |
0b728e19 | 1606 | if (!flags) |
2bc334dc NP |
1607 | return 0; |
1608 | ||
1609 | /* | |
1610 | * Drop the negative dentry, in order to make sure to use the | |
1611 | * case sensitive name which is specified by user if this is | |
1612 | * for creation. | |
1613 | */ | |
0b728e19 | 1614 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
407938e7 | 1615 | return 0; |
2bc334dc | 1616 | return 1; |
1da177e4 LT |
1617 | } |
1618 | ||
ad28b4ef | 1619 | const struct dentry_operations jfs_ci_dentry_operations = |
1da177e4 LT |
1620 | { |
1621 | .d_hash = jfs_ci_hash, | |
1622 | .d_compare = jfs_ci_compare, | |
2bc334dc | 1623 | .d_revalidate = jfs_ci_revalidate, |
1da177e4 | 1624 | }; |