]>
Commit | Line | Data |
---|---|---|
1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 | |
1da177e4 LT |
5 | */ |
6 | ||
7 | #include <linux/fs.h> | |
2bc334dc | 8 | #include <linux/namei.h> |
1da177e4 LT |
9 | #include <linux/ctype.h> |
10 | #include <linux/quotaops.h> | |
d425de70 | 11 | #include <linux/exportfs.h> |
1da177e4 LT |
12 | #include "jfs_incore.h" |
13 | #include "jfs_superblock.h" | |
14 | #include "jfs_inode.h" | |
15 | #include "jfs_dinode.h" | |
16 | #include "jfs_dmap.h" | |
17 | #include "jfs_unicode.h" | |
18 | #include "jfs_metapage.h" | |
19 | #include "jfs_xattr.h" | |
20 | #include "jfs_acl.h" | |
21 | #include "jfs_debug.h" | |
22 | ||
1da177e4 LT |
23 | /* |
24 | * forward references | |
25 | */ | |
ad28b4ef | 26 | const struct dentry_operations jfs_ci_dentry_operations; |
1da177e4 LT |
27 | |
28 | static s64 commitZeroLink(tid_t, struct inode *); | |
29 | ||
4f4b401b DK |
30 | /* |
31 | * NAME: free_ea_wmap(inode) | |
32 | * | |
63f83c9f | 33 | * FUNCTION: free uncommitted extended attributes from working map |
4f4b401b DK |
34 | * |
35 | */ | |
36 | static inline void free_ea_wmap(struct inode *inode) | |
37 | { | |
38 | dxd_t *ea = &JFS_IP(inode)->ea; | |
39 | ||
40 | if (ea->flag & DXD_EXTENT) { | |
41 | /* free EA pages from cache */ | |
42 | invalidate_dxd_metapages(inode, *ea); | |
43 | dbFree(inode, addressDXD(ea), lengthDXD(ea)); | |
44 | } | |
45 | ea->flag = 0; | |
46 | } | |
47 | ||
1da177e4 LT |
48 | /* |
49 | * NAME: jfs_create(dip, dentry, mode) | |
50 | * | |
51 | * FUNCTION: create a regular file in the parent directory <dip> | |
52 | * with name = <from dentry> and mode = <mode> | |
53 | * | |
63f83c9f | 54 | * PARAMETER: dip - parent directory vnode |
1da177e4 LT |
55 | * dentry - dentry of new file |
56 | * mode - create mode (rwxrwxrwx). | |
57 | * nd- nd struct | |
58 | * | |
59 | * RETURN: Errors from subroutines | |
60 | * | |
61 | */ | |
549c7297 CB |
62 | static int jfs_create(struct user_namespace *mnt_userns, struct inode *dip, |
63 | struct dentry *dentry, umode_t mode, bool excl) | |
1da177e4 LT |
64 | { |
65 | int rc = 0; | |
66 | tid_t tid; /* transaction id */ | |
67 | struct inode *ip = NULL; /* child directory inode */ | |
68 | ino_t ino; | |
69 | struct component_name dname; /* child directory name */ | |
70 | struct btstack btstack; | |
71 | struct inode *iplist[2]; | |
72 | struct tblock *tblk; | |
73 | ||
a455589f | 74 | jfs_info("jfs_create: dip:0x%p name:%pd", dip, dentry); |
1da177e4 | 75 | |
acc84b05 DK |
76 | rc = dquot_initialize(dip); |
77 | if (rc) | |
78 | goto out1; | |
907f4554 | 79 | |
1da177e4 LT |
80 | /* |
81 | * search parent directory for entry/freespace | |
82 | * (dtSearch() returns parent directory page pinned) | |
83 | */ | |
84 | if ((rc = get_UCSname(&dname, dentry))) | |
85 | goto out1; | |
86 | ||
87 | /* | |
88 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
89 | * block there while holding dtree page, so we allocate the inode & | |
90 | * begin the transaction before we search the directory. | |
91 | */ | |
92 | ip = ialloc(dip, mode); | |
087387f9 AM |
93 | if (IS_ERR(ip)) { |
94 | rc = PTR_ERR(ip); | |
1da177e4 LT |
95 | goto out2; |
96 | } | |
97 | ||
98 | tid = txBegin(dip->i_sb, 0); | |
99 | ||
82d5b9a7 DK |
100 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
101 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 102 | |
4f4b401b DK |
103 | rc = jfs_init_acl(tid, ip, dip); |
104 | if (rc) | |
105 | goto out3; | |
106 | ||
2a7dba39 | 107 | rc = jfs_init_security(tid, ip, dip, &dentry->d_name); |
1d15b10f DK |
108 | if (rc) { |
109 | txAbort(tid, 0); | |
110 | goto out3; | |
111 | } | |
112 | ||
1da177e4 LT |
113 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
114 | jfs_err("jfs_create: dtSearch returned %d", rc); | |
4f4b401b | 115 | txAbort(tid, 0); |
1da177e4 LT |
116 | goto out3; |
117 | } | |
118 | ||
119 | tblk = tid_to_tblock(tid); | |
120 | tblk->xflag |= COMMIT_CREATE; | |
121 | tblk->ino = ip->i_ino; | |
122 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
123 | ||
124 | iplist[0] = dip; | |
125 | iplist[1] = ip; | |
126 | ||
127 | /* | |
128 | * initialize the child XAD tree root in-line in inode | |
129 | */ | |
130 | xtInitRoot(tid, ip); | |
131 | ||
132 | /* | |
133 | * create entry in parent directory for child directory | |
134 | * (dtInsert() releases parent directory page) | |
135 | */ | |
136 | ino = ip->i_ino; | |
137 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
138 | if (rc == -EIO) { | |
139 | jfs_err("jfs_create: dtInsert returned -EIO"); | |
140 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
141 | } else | |
142 | txAbort(tid, 0); /* Filesystem full */ | |
143 | goto out3; | |
144 | } | |
145 | ||
146 | ip->i_op = &jfs_file_inode_operations; | |
147 | ip->i_fop = &jfs_file_operations; | |
148 | ip->i_mapping->a_ops = &jfs_aops; | |
149 | ||
1da177e4 LT |
150 | mark_inode_dirty(ip); |
151 | ||
078cd827 | 152 | dip->i_ctime = dip->i_mtime = current_time(dip); |
1da177e4 LT |
153 | |
154 | mark_inode_dirty(dip); | |
155 | ||
156 | rc = txCommit(tid, 2, &iplist[0], 0); | |
157 | ||
158 | out3: | |
159 | txEnd(tid); | |
1de87444 | 160 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 161 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 162 | if (rc) { |
4f4b401b | 163 | free_ea_wmap(ip); |
6d6b77f1 | 164 | clear_nlink(ip); |
a6cbedfa | 165 | discard_new_inode(ip); |
1f3403fa | 166 | } else { |
1e2e547a | 167 | d_instantiate_new(dentry, ip); |
1f3403fa | 168 | } |
1da177e4 LT |
169 | |
170 | out2: | |
171 | free_UCSname(&dname); | |
172 | ||
1da177e4 LT |
173 | out1: |
174 | ||
175 | jfs_info("jfs_create: rc:%d", rc); | |
176 | return rc; | |
177 | } | |
178 | ||
179 | ||
180 | /* | |
181 | * NAME: jfs_mkdir(dip, dentry, mode) | |
182 | * | |
183 | * FUNCTION: create a child directory in the parent directory <dip> | |
184 | * with name = <from dentry> and mode = <mode> | |
185 | * | |
63f83c9f | 186 | * PARAMETER: dip - parent directory vnode |
1da177e4 LT |
187 | * dentry - dentry of child directory |
188 | * mode - create mode (rwxrwxrwx). | |
189 | * | |
190 | * RETURN: Errors from subroutines | |
191 | * | |
192 | * note: | |
a83722f4 | 193 | * EACCES: user needs search+write permission on the parent directory |
1da177e4 | 194 | */ |
549c7297 CB |
195 | static int jfs_mkdir(struct user_namespace *mnt_userns, struct inode *dip, |
196 | struct dentry *dentry, umode_t mode) | |
1da177e4 LT |
197 | { |
198 | int rc = 0; | |
199 | tid_t tid; /* transaction id */ | |
200 | struct inode *ip = NULL; /* child directory inode */ | |
201 | ino_t ino; | |
202 | struct component_name dname; /* child directory name */ | |
203 | struct btstack btstack; | |
204 | struct inode *iplist[2]; | |
205 | struct tblock *tblk; | |
206 | ||
a455589f | 207 | jfs_info("jfs_mkdir: dip:0x%p name:%pd", dip, dentry); |
1da177e4 | 208 | |
acc84b05 DK |
209 | rc = dquot_initialize(dip); |
210 | if (rc) | |
211 | goto out1; | |
907f4554 | 212 | |
1da177e4 LT |
213 | /* |
214 | * search parent directory for entry/freespace | |
215 | * (dtSearch() returns parent directory page pinned) | |
216 | */ | |
217 | if ((rc = get_UCSname(&dname, dentry))) | |
218 | goto out1; | |
219 | ||
220 | /* | |
221 | * Either iAlloc() or txBegin() may block. Deadlock can occur if we | |
222 | * block there while holding dtree page, so we allocate the inode & | |
223 | * begin the transaction before we search the directory. | |
224 | */ | |
225 | ip = ialloc(dip, S_IFDIR | mode); | |
087387f9 AM |
226 | if (IS_ERR(ip)) { |
227 | rc = PTR_ERR(ip); | |
1da177e4 LT |
228 | goto out2; |
229 | } | |
230 | ||
231 | tid = txBegin(dip->i_sb, 0); | |
232 | ||
82d5b9a7 DK |
233 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
234 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 235 | |
4f4b401b DK |
236 | rc = jfs_init_acl(tid, ip, dip); |
237 | if (rc) | |
238 | goto out3; | |
239 | ||
2a7dba39 | 240 | rc = jfs_init_security(tid, ip, dip, &dentry->d_name); |
1d15b10f DK |
241 | if (rc) { |
242 | txAbort(tid, 0); | |
243 | goto out3; | |
244 | } | |
245 | ||
1da177e4 LT |
246 | if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) { |
247 | jfs_err("jfs_mkdir: dtSearch returned %d", rc); | |
4f4b401b | 248 | txAbort(tid, 0); |
1da177e4 LT |
249 | goto out3; |
250 | } | |
251 | ||
252 | tblk = tid_to_tblock(tid); | |
253 | tblk->xflag |= COMMIT_CREATE; | |
254 | tblk->ino = ip->i_ino; | |
255 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
256 | ||
257 | iplist[0] = dip; | |
258 | iplist[1] = ip; | |
259 | ||
260 | /* | |
261 | * initialize the child directory in-line in inode | |
262 | */ | |
263 | dtInitRoot(tid, ip, dip->i_ino); | |
264 | ||
265 | /* | |
266 | * create entry in parent directory for child directory | |
267 | * (dtInsert() releases parent directory page) | |
268 | */ | |
269 | ino = ip->i_ino; | |
270 | if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) { | |
271 | if (rc == -EIO) { | |
272 | jfs_err("jfs_mkdir: dtInsert returned -EIO"); | |
273 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
274 | } else | |
275 | txAbort(tid, 0); /* Filesystem full */ | |
276 | goto out3; | |
277 | } | |
278 | ||
bfe86848 | 279 | set_nlink(ip, 2); /* for '.' */ |
1da177e4 LT |
280 | ip->i_op = &jfs_dir_inode_operations; |
281 | ip->i_fop = &jfs_dir_operations; | |
282 | ||
1da177e4 LT |
283 | mark_inode_dirty(ip); |
284 | ||
285 | /* update parent directory inode */ | |
d8c76e6f | 286 | inc_nlink(dip); /* for '..' from child directory */ |
078cd827 | 287 | dip->i_ctime = dip->i_mtime = current_time(dip); |
1da177e4 LT |
288 | mark_inode_dirty(dip); |
289 | ||
290 | rc = txCommit(tid, 2, &iplist[0], 0); | |
291 | ||
292 | out3: | |
293 | txEnd(tid); | |
1de87444 | 294 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 295 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 296 | if (rc) { |
4f4b401b | 297 | free_ea_wmap(ip); |
6d6b77f1 | 298 | clear_nlink(ip); |
a6cbedfa | 299 | discard_new_inode(ip); |
1f3403fa | 300 | } else { |
1e2e547a | 301 | d_instantiate_new(dentry, ip); |
1f3403fa | 302 | } |
1da177e4 LT |
303 | |
304 | out2: | |
305 | free_UCSname(&dname); | |
306 | ||
1da177e4 LT |
307 | |
308 | out1: | |
309 | ||
310 | jfs_info("jfs_mkdir: rc:%d", rc); | |
311 | return rc; | |
312 | } | |
313 | ||
314 | /* | |
315 | * NAME: jfs_rmdir(dip, dentry) | |
316 | * | |
317 | * FUNCTION: remove a link to child directory | |
318 | * | |
63f83c9f | 319 | * PARAMETER: dip - parent inode |
1da177e4 LT |
320 | * dentry - child directory dentry |
321 | * | |
322 | * RETURN: -EINVAL - if name is . or .. | |
f720e3ba | 323 | * -EINVAL - if . or .. exist but are invalid. |
1da177e4 LT |
324 | * errors from subroutines |
325 | * | |
326 | * note: | |
63f83c9f DK |
327 | * if other threads have the directory open when the last link |
328 | * is removed, the "." and ".." entries, if present, are removed before | |
329 | * rmdir() returns and no new entries may be created in the directory, | |
330 | * but the directory is not removed until the last reference to | |
1da177e4 LT |
331 | * the directory is released (cf.unlink() of regular file). |
332 | */ | |
333 | static int jfs_rmdir(struct inode *dip, struct dentry *dentry) | |
334 | { | |
335 | int rc; | |
336 | tid_t tid; /* transaction id */ | |
2b0143b5 | 337 | struct inode *ip = d_inode(dentry); |
1da177e4 LT |
338 | ino_t ino; |
339 | struct component_name dname; | |
340 | struct inode *iplist[2]; | |
341 | struct tblock *tblk; | |
342 | ||
a455589f | 343 | jfs_info("jfs_rmdir: dip:0x%p name:%pd", dip, dentry); |
1da177e4 LT |
344 | |
345 | /* Init inode for quota operations. */ | |
acc84b05 DK |
346 | rc = dquot_initialize(dip); |
347 | if (rc) | |
348 | goto out; | |
349 | rc = dquot_initialize(ip); | |
350 | if (rc) | |
351 | goto out; | |
1da177e4 LT |
352 | |
353 | /* directory must be empty to be removed */ | |
354 | if (!dtEmpty(ip)) { | |
355 | rc = -ENOTEMPTY; | |
356 | goto out; | |
357 | } | |
358 | ||
359 | if ((rc = get_UCSname(&dname, dentry))) { | |
360 | goto out; | |
361 | } | |
362 | ||
363 | tid = txBegin(dip->i_sb, 0); | |
364 | ||
82d5b9a7 DK |
365 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
366 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
367 | |
368 | iplist[0] = dip; | |
369 | iplist[1] = ip; | |
370 | ||
371 | tblk = tid_to_tblock(tid); | |
372 | tblk->xflag |= COMMIT_DELETE; | |
373 | tblk->u.ip = ip; | |
374 | ||
375 | /* | |
376 | * delete the entry of target directory from parent directory | |
377 | */ | |
378 | ino = ip->i_ino; | |
379 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
380 | jfs_err("jfs_rmdir: dtDelete returned %d", rc); | |
381 | if (rc == -EIO) | |
382 | txAbort(tid, 1); | |
383 | txEnd(tid); | |
1de87444 | 384 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 385 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
386 | |
387 | goto out2; | |
388 | } | |
389 | ||
390 | /* update parent directory's link count corresponding | |
391 | * to ".." entry of the target directory deleted | |
392 | */ | |
078cd827 | 393 | dip->i_ctime = dip->i_mtime = current_time(dip); |
9a53c3a7 | 394 | inode_dec_link_count(dip); |
1da177e4 LT |
395 | |
396 | /* | |
397 | * OS/2 could have created EA and/or ACL | |
398 | */ | |
399 | /* free EA from both persistent and working map */ | |
400 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
401 | /* free EA pages */ | |
402 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
403 | } | |
404 | JFS_IP(ip)->ea.flag = 0; | |
405 | ||
406 | /* free ACL from both persistent and working map */ | |
407 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
408 | /* free ACL pages */ | |
409 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
410 | } | |
411 | JFS_IP(ip)->acl.flag = 0; | |
412 | ||
413 | /* mark the target directory as deleted */ | |
ce71ec36 | 414 | clear_nlink(ip); |
1da177e4 LT |
415 | mark_inode_dirty(ip); |
416 | ||
417 | rc = txCommit(tid, 2, &iplist[0], 0); | |
418 | ||
419 | txEnd(tid); | |
420 | ||
1de87444 | 421 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 422 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
423 | |
424 | /* | |
425 | * Truncating the directory index table is not guaranteed. It | |
426 | * may need to be done iteratively | |
427 | */ | |
428 | if (test_cflag(COMMIT_Stale, dip)) { | |
429 | if (dip->i_size > 1) | |
430 | jfs_truncate_nolock(dip, 0); | |
431 | ||
432 | clear_cflag(COMMIT_Stale, dip); | |
433 | } | |
434 | ||
435 | out2: | |
436 | free_UCSname(&dname); | |
437 | ||
438 | out: | |
439 | jfs_info("jfs_rmdir: rc:%d", rc); | |
440 | return rc; | |
441 | } | |
442 | ||
443 | /* | |
444 | * NAME: jfs_unlink(dip, dentry) | |
445 | * | |
63f83c9f | 446 | * FUNCTION: remove a link to object <vp> named by <name> |
1da177e4 LT |
447 | * from parent directory <dvp> |
448 | * | |
63f83c9f DK |
449 | * PARAMETER: dip - inode of parent directory |
450 | * dentry - dentry of object to be removed | |
1da177e4 LT |
451 | * |
452 | * RETURN: errors from subroutines | |
453 | * | |
454 | * note: | |
455 | * temporary file: if one or more processes have the file open | |
456 | * when the last link is removed, the link will be removed before | |
457 | * unlink() returns, but the removal of the file contents will be | |
458 | * postponed until all references to the files are closed. | |
459 | * | |
460 | * JFS does NOT support unlink() on directories. | |
461 | * | |
462 | */ | |
463 | static int jfs_unlink(struct inode *dip, struct dentry *dentry) | |
464 | { | |
465 | int rc; | |
466 | tid_t tid; /* transaction id */ | |
2b0143b5 | 467 | struct inode *ip = d_inode(dentry); |
1da177e4 LT |
468 | ino_t ino; |
469 | struct component_name dname; /* object name */ | |
470 | struct inode *iplist[2]; | |
471 | struct tblock *tblk; | |
472 | s64 new_size = 0; | |
473 | int commit_flag; | |
474 | ||
a455589f | 475 | jfs_info("jfs_unlink: dip:0x%p name:%pd", dip, dentry); |
1da177e4 LT |
476 | |
477 | /* Init inode for quota operations. */ | |
acc84b05 DK |
478 | rc = dquot_initialize(dip); |
479 | if (rc) | |
480 | goto out; | |
481 | rc = dquot_initialize(ip); | |
482 | if (rc) | |
483 | goto out; | |
1da177e4 LT |
484 | |
485 | if ((rc = get_UCSname(&dname, dentry))) | |
486 | goto out; | |
487 | ||
82d5b9a7 | 488 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
489 | |
490 | tid = txBegin(dip->i_sb, 0); | |
491 | ||
82d5b9a7 DK |
492 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
493 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
494 | |
495 | iplist[0] = dip; | |
496 | iplist[1] = ip; | |
497 | ||
498 | /* | |
499 | * delete the entry of target file from parent directory | |
500 | */ | |
501 | ino = ip->i_ino; | |
502 | if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) { | |
503 | jfs_err("jfs_unlink: dtDelete returned %d", rc); | |
504 | if (rc == -EIO) | |
505 | txAbort(tid, 1); /* Marks FS Dirty */ | |
506 | txEnd(tid); | |
1de87444 | 507 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 508 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
509 | IWRITE_UNLOCK(ip); |
510 | goto out1; | |
511 | } | |
512 | ||
513 | ASSERT(ip->i_nlink); | |
514 | ||
078cd827 | 515 | ip->i_ctime = dip->i_ctime = dip->i_mtime = current_time(ip); |
1da177e4 LT |
516 | mark_inode_dirty(dip); |
517 | ||
518 | /* update target's inode */ | |
9a53c3a7 | 519 | inode_dec_link_count(ip); |
1da177e4 LT |
520 | |
521 | /* | |
f720e3ba | 522 | * commit zero link count object |
1da177e4 LT |
523 | */ |
524 | if (ip->i_nlink == 0) { | |
525 | assert(!test_cflag(COMMIT_Nolink, ip)); | |
526 | /* free block resources */ | |
527 | if ((new_size = commitZeroLink(tid, ip)) < 0) { | |
528 | txAbort(tid, 1); /* Marks FS Dirty */ | |
529 | txEnd(tid); | |
1de87444 | 530 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 531 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
532 | IWRITE_UNLOCK(ip); |
533 | rc = new_size; | |
534 | goto out1; | |
535 | } | |
536 | tblk = tid_to_tblock(tid); | |
537 | tblk->xflag |= COMMIT_DELETE; | |
538 | tblk->u.ip = ip; | |
539 | } | |
540 | ||
541 | /* | |
542 | * Incomplete truncate of file data can | |
543 | * result in timing problems unless we synchronously commit the | |
544 | * transaction. | |
545 | */ | |
546 | if (new_size) | |
547 | commit_flag = COMMIT_SYNC; | |
548 | else | |
549 | commit_flag = 0; | |
550 | ||
551 | /* | |
552 | * If xtTruncate was incomplete, commit synchronously to avoid | |
553 | * timing complications | |
554 | */ | |
555 | rc = txCommit(tid, 2, &iplist[0], commit_flag); | |
556 | ||
557 | txEnd(tid); | |
558 | ||
1de87444 | 559 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 560 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 LT |
561 | |
562 | while (new_size && (rc == 0)) { | |
563 | tid = txBegin(dip->i_sb, 0); | |
1de87444 | 564 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
565 | new_size = xtTruncate_pmap(tid, ip, new_size); |
566 | if (new_size < 0) { | |
567 | txAbort(tid, 1); /* Marks FS Dirty */ | |
568 | rc = new_size; | |
569 | } else | |
570 | rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC); | |
571 | txEnd(tid); | |
1de87444 | 572 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
573 | } |
574 | ||
575 | if (ip->i_nlink == 0) | |
576 | set_cflag(COMMIT_Nolink, ip); | |
577 | ||
578 | IWRITE_UNLOCK(ip); | |
579 | ||
580 | /* | |
581 | * Truncating the directory index table is not guaranteed. It | |
582 | * may need to be done iteratively | |
583 | */ | |
584 | if (test_cflag(COMMIT_Stale, dip)) { | |
585 | if (dip->i_size > 1) | |
586 | jfs_truncate_nolock(dip, 0); | |
587 | ||
588 | clear_cflag(COMMIT_Stale, dip); | |
589 | } | |
590 | ||
591 | out1: | |
592 | free_UCSname(&dname); | |
593 | out: | |
594 | jfs_info("jfs_unlink: rc:%d", rc); | |
595 | return rc; | |
596 | } | |
597 | ||
598 | /* | |
599 | * NAME: commitZeroLink() | |
600 | * | |
f720e3ba | 601 | * FUNCTION: for non-directory, called by jfs_remove(), |
1da177e4 | 602 | * truncate a regular file, directory or symbolic |
63f83c9f | 603 | * link to zero length. return 0 if type is not |
1da177e4 LT |
604 | * one of these. |
605 | * | |
606 | * if the file is currently associated with a VM segment | |
607 | * only permanent disk and inode map resources are freed, | |
608 | * and neither the inode nor indirect blocks are modified | |
609 | * so that the resources can be later freed in the work | |
610 | * map by ctrunc1. | |
611 | * if there is no VM segment on entry, the resources are | |
612 | * freed in both work and permanent map. | |
63f83c9f | 613 | * (? for temporary file - memory object is cached even |
1da177e4 LT |
614 | * after no reference: |
615 | * reference count > 0 - ) | |
616 | * | |
617 | * PARAMETERS: cd - pointer to commit data structure. | |
618 | * current inode is the one to truncate. | |
619 | * | |
620 | * RETURN: Errors from subroutines | |
621 | */ | |
622 | static s64 commitZeroLink(tid_t tid, struct inode *ip) | |
623 | { | |
624 | int filetype; | |
625 | struct tblock *tblk; | |
626 | ||
627 | jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip); | |
628 | ||
629 | filetype = ip->i_mode & S_IFMT; | |
630 | switch (filetype) { | |
631 | case S_IFREG: | |
632 | break; | |
633 | case S_IFLNK: | |
634 | /* fast symbolic link */ | |
635 | if (ip->i_size < IDATASIZE) { | |
636 | ip->i_size = 0; | |
637 | return 0; | |
638 | } | |
639 | break; | |
640 | default: | |
641 | assert(filetype != S_IFDIR); | |
642 | return 0; | |
643 | } | |
644 | ||
645 | set_cflag(COMMIT_Freewmap, ip); | |
646 | ||
647 | /* mark transaction of block map update type */ | |
648 | tblk = tid_to_tblock(tid); | |
649 | tblk->xflag |= COMMIT_PMAP; | |
650 | ||
651 | /* | |
652 | * free EA | |
653 | */ | |
654 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) | |
655 | /* acquire maplock on EA to be freed from block map */ | |
656 | txEA(tid, ip, &JFS_IP(ip)->ea, NULL); | |
657 | ||
658 | /* | |
659 | * free ACL | |
660 | */ | |
661 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) | |
662 | /* acquire maplock on EA to be freed from block map */ | |
663 | txEA(tid, ip, &JFS_IP(ip)->acl, NULL); | |
664 | ||
665 | /* | |
666 | * free xtree/data (truncate to zero length): | |
63f83c9f | 667 | * free xtree/data pages from cache if COMMIT_PWMAP, |
1da177e4 LT |
668 | * free xtree/data blocks from persistent block map, and |
669 | * free xtree/data blocks from working block map if COMMIT_PWMAP; | |
670 | */ | |
671 | if (ip->i_size) | |
672 | return xtTruncate_pmap(tid, ip, 0); | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | ||
678 | /* | |
1868f4aa | 679 | * NAME: jfs_free_zero_link() |
1da177e4 | 680 | * |
f720e3ba | 681 | * FUNCTION: for non-directory, called by iClose(), |
63f83c9f | 682 | * free resources of a file from cache and WORKING map |
1da177e4 LT |
683 | * for a file previously committed with zero link count |
684 | * while associated with a pager object, | |
685 | * | |
686 | * PARAMETER: ip - pointer to inode of file. | |
1da177e4 | 687 | */ |
1868f4aa | 688 | void jfs_free_zero_link(struct inode *ip) |
1da177e4 | 689 | { |
1da177e4 LT |
690 | int type; |
691 | ||
1868f4aa | 692 | jfs_info("jfs_free_zero_link: ip = 0x%p", ip); |
1da177e4 LT |
693 | |
694 | /* return if not reg or symbolic link or if size is | |
695 | * already ok. | |
696 | */ | |
697 | type = ip->i_mode & S_IFMT; | |
698 | ||
699 | switch (type) { | |
700 | case S_IFREG: | |
701 | break; | |
702 | case S_IFLNK: | |
703 | /* if its contained in inode nothing to do */ | |
704 | if (ip->i_size < IDATASIZE) | |
1868f4aa | 705 | return; |
1da177e4 LT |
706 | break; |
707 | default: | |
1868f4aa | 708 | return; |
1da177e4 LT |
709 | } |
710 | ||
711 | /* | |
712 | * free EA | |
713 | */ | |
714 | if (JFS_IP(ip)->ea.flag & DXD_EXTENT) { | |
715 | s64 xaddr = addressDXD(&JFS_IP(ip)->ea); | |
716 | int xlen = lengthDXD(&JFS_IP(ip)->ea); | |
717 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
718 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
719 | ||
720 | /* free EA pages from cache */ | |
721 | invalidate_dxd_metapages(ip, JFS_IP(ip)->ea); | |
722 | ||
723 | /* free EA extent from working block map */ | |
724 | maplock.index = 1; | |
725 | pxdlock = (struct pxd_lock *) & maplock; | |
726 | pxdlock->flag = mlckFREEPXD; | |
727 | PXDaddress(&pxdlock->pxd, xaddr); | |
728 | PXDlength(&pxdlock->pxd, xlen); | |
729 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
730 | } | |
731 | ||
732 | /* | |
733 | * free ACL | |
734 | */ | |
735 | if (JFS_IP(ip)->acl.flag & DXD_EXTENT) { | |
736 | s64 xaddr = addressDXD(&JFS_IP(ip)->acl); | |
737 | int xlen = lengthDXD(&JFS_IP(ip)->acl); | |
738 | struct maplock maplock; /* maplock for COMMIT_WMAP */ | |
739 | struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */ | |
740 | ||
741 | invalidate_dxd_metapages(ip, JFS_IP(ip)->acl); | |
742 | ||
743 | /* free ACL extent from working block map */ | |
744 | maplock.index = 1; | |
745 | pxdlock = (struct pxd_lock *) & maplock; | |
746 | pxdlock->flag = mlckFREEPXD; | |
747 | PXDaddress(&pxdlock->pxd, xaddr); | |
748 | PXDlength(&pxdlock->pxd, xlen); | |
749 | txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP); | |
750 | } | |
751 | ||
752 | /* | |
753 | * free xtree/data (truncate to zero length): | |
754 | * free xtree/data pages from cache, and | |
755 | * free xtree/data blocks from working block map; | |
756 | */ | |
757 | if (ip->i_size) | |
1868f4aa | 758 | xtTruncate(0, ip, 0, COMMIT_WMAP); |
1da177e4 LT |
759 | } |
760 | ||
761 | /* | |
762 | * NAME: jfs_link(vp, dvp, name, crp) | |
763 | * | |
764 | * FUNCTION: create a link to <vp> by the name = <name> | |
765 | * in the parent directory <dvp> | |
766 | * | |
63f83c9f | 767 | * PARAMETER: vp - target object |
1da177e4 LT |
768 | * dvp - parent directory of new link |
769 | * name - name of new link to target object | |
770 | * crp - credential | |
771 | * | |
772 | * RETURN: Errors from subroutines | |
773 | * | |
774 | * note: | |
775 | * JFS does NOT support link() on directories (to prevent circular | |
776 | * path in the directory hierarchy); | |
777 | * EPERM: the target object is a directory, and either the caller | |
778 | * does not have appropriate privileges or the implementation prohibits | |
779 | * using link() on directories [XPG4.2]. | |
780 | * | |
781 | * JFS does NOT support links between file systems: | |
782 | * EXDEV: target object and new link are on different file systems and | |
783 | * implementation does not support links between file systems [XPG4.2]. | |
784 | */ | |
785 | static int jfs_link(struct dentry *old_dentry, | |
786 | struct inode *dir, struct dentry *dentry) | |
787 | { | |
788 | int rc; | |
789 | tid_t tid; | |
2b0143b5 | 790 | struct inode *ip = d_inode(old_dentry); |
1da177e4 LT |
791 | ino_t ino; |
792 | struct component_name dname; | |
793 | struct btstack btstack; | |
794 | struct inode *iplist[2]; | |
795 | ||
a455589f | 796 | jfs_info("jfs_link: %pd %pd", old_dentry, dentry); |
1da177e4 | 797 | |
acc84b05 DK |
798 | rc = dquot_initialize(dir); |
799 | if (rc) | |
800 | goto out; | |
907f4554 | 801 | |
1da177e4 LT |
802 | tid = txBegin(ip->i_sb, 0); |
803 | ||
82d5b9a7 DK |
804 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
805 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 LT |
806 | |
807 | /* | |
808 | * scan parent directory for entry/freespace | |
809 | */ | |
810 | if ((rc = get_UCSname(&dname, dentry))) | |
acc84b05 | 811 | goto out_tx; |
1da177e4 LT |
812 | |
813 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) | |
814 | goto free_dname; | |
815 | ||
816 | /* | |
817 | * create entry for new link in parent directory | |
818 | */ | |
819 | ino = ip->i_ino; | |
820 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) | |
821 | goto free_dname; | |
822 | ||
823 | /* update object inode */ | |
d8c76e6f | 824 | inc_nlink(ip); /* for new link */ |
078cd827 DD |
825 | ip->i_ctime = current_time(ip); |
826 | dir->i_ctime = dir->i_mtime = current_time(dir); | |
1da177e4 | 827 | mark_inode_dirty(dir); |
7de9c6ee | 828 | ihold(ip); |
1da177e4 LT |
829 | |
830 | iplist[0] = ip; | |
831 | iplist[1] = dir; | |
832 | rc = txCommit(tid, 2, &iplist[0], 0); | |
833 | ||
834 | if (rc) { | |
6d6b77f1 | 835 | drop_nlink(ip); /* never instantiated */ |
1da177e4 LT |
836 | iput(ip); |
837 | } else | |
838 | d_instantiate(dentry, ip); | |
839 | ||
840 | free_dname: | |
841 | free_UCSname(&dname); | |
842 | ||
acc84b05 | 843 | out_tx: |
1da177e4 LT |
844 | txEnd(tid); |
845 | ||
1de87444 | 846 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 847 | mutex_unlock(&JFS_IP(dir)->commit_mutex); |
1da177e4 | 848 | |
acc84b05 | 849 | out: |
1da177e4 LT |
850 | jfs_info("jfs_link: rc:%d", rc); |
851 | return rc; | |
852 | } | |
853 | ||
854 | /* | |
855 | * NAME: jfs_symlink(dip, dentry, name) | |
856 | * | |
857 | * FUNCTION: creates a symbolic link to <symlink> by name <name> | |
f720e3ba | 858 | * in directory <dip> |
1da177e4 | 859 | * |
f720e3ba DK |
860 | * PARAMETER: dip - parent directory vnode |
861 | * dentry - dentry of symbolic link | |
862 | * name - the path name of the existing object | |
863 | * that will be the source of the link | |
1da177e4 LT |
864 | * |
865 | * RETURN: errors from subroutines | |
866 | * | |
867 | * note: | |
868 | * ENAMETOOLONG: pathname resolution of a symbolic link produced | |
869 | * an intermediate result whose length exceeds PATH_MAX [XPG4.2] | |
870 | */ | |
871 | ||
549c7297 CB |
872 | static int jfs_symlink(struct user_namespace *mnt_userns, struct inode *dip, |
873 | struct dentry *dentry, const char *name) | |
1da177e4 LT |
874 | { |
875 | int rc; | |
876 | tid_t tid; | |
877 | ino_t ino = 0; | |
878 | struct component_name dname; | |
879 | int ssize; /* source pathname size */ | |
880 | struct btstack btstack; | |
2b0143b5 | 881 | struct inode *ip = d_inode(dentry); |
1da177e4 LT |
882 | s64 xlen = 0; |
883 | int bmask = 0, xsize; | |
3c2c2262 | 884 | s64 xaddr; |
1da177e4 LT |
885 | struct metapage *mp; |
886 | struct super_block *sb; | |
887 | struct tblock *tblk; | |
888 | ||
889 | struct inode *iplist[2]; | |
890 | ||
891 | jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name); | |
892 | ||
acc84b05 DK |
893 | rc = dquot_initialize(dip); |
894 | if (rc) | |
895 | goto out1; | |
907f4554 | 896 | |
1da177e4 LT |
897 | ssize = strlen(name) + 1; |
898 | ||
899 | /* | |
900 | * search parent directory for entry/freespace | |
901 | * (dtSearch() returns parent directory page pinned) | |
902 | */ | |
903 | ||
904 | if ((rc = get_UCSname(&dname, dentry))) | |
905 | goto out1; | |
906 | ||
907 | /* | |
908 | * allocate on-disk/in-memory inode for symbolic link: | |
909 | * (iAlloc() returns new, locked inode) | |
910 | */ | |
911 | ip = ialloc(dip, S_IFLNK | 0777); | |
087387f9 AM |
912 | if (IS_ERR(ip)) { |
913 | rc = PTR_ERR(ip); | |
1da177e4 LT |
914 | goto out2; |
915 | } | |
916 | ||
917 | tid = txBegin(dip->i_sb, 0); | |
918 | ||
82d5b9a7 DK |
919 | mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT); |
920 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 921 | |
2a7dba39 | 922 | rc = jfs_init_security(tid, ip, dip, &dentry->d_name); |
1d15b10f DK |
923 | if (rc) |
924 | goto out3; | |
925 | ||
1da177e4 LT |
926 | tblk = tid_to_tblock(tid); |
927 | tblk->xflag |= COMMIT_CREATE; | |
928 | tblk->ino = ip->i_ino; | |
929 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
930 | ||
931 | /* fix symlink access permission | |
63f83c9f | 932 | * (dir_create() ANDs in the u.u_cmask, |
1da177e4 LT |
933 | * but symlinks really need to be 777 access) |
934 | */ | |
935 | ip->i_mode |= 0777; | |
936 | ||
937 | /* | |
938 | * write symbolic link target path name | |
939 | */ | |
940 | xtInitRoot(tid, ip); | |
941 | ||
942 | /* | |
943 | * write source path name inline in on-disk inode (fast symbolic link) | |
944 | */ | |
945 | ||
946 | if (ssize <= IDATASIZE) { | |
c7f2e1f0 | 947 | ip->i_op = &jfs_fast_symlink_inode_operations; |
1da177e4 | 948 | |
ebe06036 | 949 | ip->i_link = JFS_IP(ip)->i_inline_all; |
ad476fed | 950 | memcpy(ip->i_link, name, ssize); |
1da177e4 LT |
951 | ip->i_size = ssize - 1; |
952 | ||
953 | /* | |
954 | * if symlink is > 128 bytes, we don't have the space to | |
955 | * store inline extended attributes | |
956 | */ | |
957 | if (ssize > sizeof (JFS_IP(ip)->i_inline)) | |
958 | JFS_IP(ip)->mode2 &= ~INLINEEA; | |
959 | ||
960 | jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ", | |
961 | ssize, name); | |
962 | } | |
963 | /* | |
964 | * write source path name in a single extent | |
965 | */ | |
966 | else { | |
967 | jfs_info("jfs_symlink: allocate extent ip:0x%p", ip); | |
968 | ||
c7f2e1f0 | 969 | ip->i_op = &jfs_symlink_inode_operations; |
21fc61c7 | 970 | inode_nohighmem(ip); |
1da177e4 LT |
971 | ip->i_mapping->a_ops = &jfs_aops; |
972 | ||
973 | /* | |
63f83c9f | 974 | * even though the data of symlink object (source |
1da177e4 LT |
975 | * path name) is treated as non-journaled user data, |
976 | * it is read/written thru buffer cache for performance. | |
977 | */ | |
978 | sb = ip->i_sb; | |
979 | bmask = JFS_SBI(sb)->bsize - 1; | |
980 | xsize = (ssize + bmask) & ~bmask; | |
981 | xaddr = 0; | |
982 | xlen = xsize >> JFS_SBI(sb)->l2bsize; | |
983 | if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) { | |
984 | txAbort(tid, 0); | |
1da177e4 LT |
985 | goto out3; |
986 | } | |
1da177e4 LT |
987 | ip->i_size = ssize - 1; |
988 | while (ssize) { | |
989 | /* This is kind of silly since PATH_MAX == 4K */ | |
990 | int copy_size = min(ssize, PSIZE); | |
991 | ||
992 | mp = get_metapage(ip, xaddr, PSIZE, 1); | |
993 | ||
994 | if (mp == NULL) { | |
995 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
996 | rc = -EIO; | |
997 | txAbort(tid, 0); | |
998 | goto out3; | |
999 | } | |
1000 | memcpy(mp->data, name, copy_size); | |
1001 | flush_metapage(mp); | |
1002 | ssize -= copy_size; | |
1003 | name += copy_size; | |
1004 | xaddr += JFS_SBI(sb)->nbperpage; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * create entry for symbolic link in parent directory | |
1010 | */ | |
1011 | rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE); | |
1012 | if (rc == 0) { | |
1013 | ino = ip->i_ino; | |
1014 | rc = dtInsert(tid, dip, &dname, &ino, &btstack); | |
1015 | } | |
1016 | if (rc) { | |
1017 | if (xlen) | |
1018 | xtTruncate(tid, ip, 0, COMMIT_PWMAP); | |
1019 | txAbort(tid, 0); | |
1020 | /* discard new inode */ | |
1021 | goto out3; | |
1022 | } | |
1023 | ||
1da177e4 LT |
1024 | mark_inode_dirty(ip); |
1025 | ||
078cd827 | 1026 | dip->i_ctime = dip->i_mtime = current_time(dip); |
988a6490 | 1027 | mark_inode_dirty(dip); |
1da177e4 LT |
1028 | /* |
1029 | * commit update of parent directory and link object | |
1030 | */ | |
1031 | ||
1032 | iplist[0] = dip; | |
1033 | iplist[1] = ip; | |
1034 | rc = txCommit(tid, 2, &iplist[0], 0); | |
1035 | ||
1036 | out3: | |
1037 | txEnd(tid); | |
1de87444 | 1038 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
48ce8b05 | 1039 | mutex_unlock(&JFS_IP(dip)->commit_mutex); |
1da177e4 | 1040 | if (rc) { |
4f4b401b | 1041 | free_ea_wmap(ip); |
6d6b77f1 | 1042 | clear_nlink(ip); |
a6cbedfa | 1043 | discard_new_inode(ip); |
1f3403fa | 1044 | } else { |
1e2e547a | 1045 | d_instantiate_new(dentry, ip); |
1f3403fa | 1046 | } |
1da177e4 LT |
1047 | |
1048 | out2: | |
1049 | free_UCSname(&dname); | |
1050 | ||
1da177e4 LT |
1051 | out1: |
1052 | jfs_info("jfs_symlink: rc:%d", rc); | |
1053 | return rc; | |
1054 | } | |
1055 | ||
1056 | ||
1057 | /* | |
f720e3ba | 1058 | * NAME: jfs_rename |
1da177e4 | 1059 | * |
f720e3ba | 1060 | * FUNCTION: rename a file or directory |
1da177e4 | 1061 | */ |
549c7297 CB |
1062 | static int jfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, |
1063 | struct dentry *old_dentry, struct inode *new_dir, | |
1064 | struct dentry *new_dentry, unsigned int flags) | |
1da177e4 LT |
1065 | { |
1066 | struct btstack btstack; | |
1067 | ino_t ino; | |
1068 | struct component_name new_dname; | |
1069 | struct inode *new_ip; | |
1070 | struct component_name old_dname; | |
1071 | struct inode *old_ip; | |
1072 | int rc; | |
1073 | tid_t tid; | |
1074 | struct tlock *tlck; | |
1075 | struct dt_lock *dtlck; | |
1076 | struct lv *lv; | |
1077 | int ipcount; | |
1078 | struct inode *iplist[4]; | |
1079 | struct tblock *tblk; | |
1080 | s64 new_size = 0; | |
1081 | int commit_flag; | |
1082 | ||
f03b8ad8 MS |
1083 | if (flags & ~RENAME_NOREPLACE) |
1084 | return -EINVAL; | |
1da177e4 | 1085 | |
a455589f | 1086 | jfs_info("jfs_rename: %pd %pd", old_dentry, new_dentry); |
1da177e4 | 1087 | |
acc84b05 DK |
1088 | rc = dquot_initialize(old_dir); |
1089 | if (rc) | |
1090 | goto out1; | |
1091 | rc = dquot_initialize(new_dir); | |
1092 | if (rc) | |
1093 | goto out1; | |
907f4554 | 1094 | |
2b0143b5 DH |
1095 | old_ip = d_inode(old_dentry); |
1096 | new_ip = d_inode(new_dentry); | |
1da177e4 LT |
1097 | |
1098 | if ((rc = get_UCSname(&old_dname, old_dentry))) | |
1099 | goto out1; | |
1100 | ||
1101 | if ((rc = get_UCSname(&new_dname, new_dentry))) | |
1102 | goto out2; | |
1103 | ||
1104 | /* | |
1105 | * Make sure source inode number is what we think it is | |
1106 | */ | |
1107 | rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP); | |
1108 | if (rc || (ino != old_ip->i_ino)) { | |
1109 | rc = -ENOENT; | |
1110 | goto out3; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * Make sure dest inode number (if any) is what we think it is | |
1115 | */ | |
1116 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP); | |
09aaa749 | 1117 | if (!rc) { |
da8a41d1 | 1118 | if ((!new_ip) || (ino != new_ip->i_ino)) { |
1da177e4 LT |
1119 | rc = -ESTALE; |
1120 | goto out3; | |
1121 | } | |
1122 | } else if (rc != -ENOENT) | |
1123 | goto out3; | |
1124 | else if (new_ip) { | |
1125 | /* no entry exists, but one was expected */ | |
1126 | rc = -ESTALE; | |
1127 | goto out3; | |
1128 | } | |
1129 | ||
1130 | if (S_ISDIR(old_ip->i_mode)) { | |
1131 | if (new_ip) { | |
1132 | if (!dtEmpty(new_ip)) { | |
1133 | rc = -ENOTEMPTY; | |
1134 | goto out3; | |
1135 | } | |
1da177e4 LT |
1136 | } |
1137 | } else if (new_ip) { | |
82d5b9a7 | 1138 | IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL); |
1da177e4 | 1139 | /* Init inode for quota operations. */ |
acc84b05 DK |
1140 | rc = dquot_initialize(new_ip); |
1141 | if (rc) | |
1142 | goto out_unlock; | |
1da177e4 LT |
1143 | } |
1144 | ||
1145 | /* | |
1146 | * The real work starts here | |
1147 | */ | |
1148 | tid = txBegin(new_dir->i_sb, 0); | |
1149 | ||
82d5b9a7 DK |
1150 | /* |
1151 | * How do we know the locking is safe from deadlocks? | |
1152 | * The vfs does the hard part for us. Any time we are taking nested | |
1153 | * commit_mutexes, the vfs already has i_mutex held on the parent. | |
1154 | * Here, the vfs has already taken i_mutex on both old_dir and new_dir. | |
1155 | */ | |
1156 | mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT); | |
1157 | mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 1158 | if (old_dir != new_dir) |
82d5b9a7 DK |
1159 | mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex, |
1160 | COMMIT_MUTEX_SECOND_PARENT); | |
1da177e4 LT |
1161 | |
1162 | if (new_ip) { | |
82d5b9a7 DK |
1163 | mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex, |
1164 | COMMIT_MUTEX_VICTIM); | |
1da177e4 LT |
1165 | /* |
1166 | * Change existing directory entry to new inode number | |
1167 | */ | |
1168 | ino = new_ip->i_ino; | |
1169 | rc = dtModify(tid, new_dir, &new_dname, &ino, | |
1170 | old_ip->i_ino, JFS_RENAME); | |
1171 | if (rc) | |
26456955 | 1172 | goto out_tx; |
9a53c3a7 | 1173 | drop_nlink(new_ip); |
1da177e4 | 1174 | if (S_ISDIR(new_ip->i_mode)) { |
9a53c3a7 | 1175 | drop_nlink(new_ip); |
1da177e4 | 1176 | if (new_ip->i_nlink) { |
48ce8b05 | 1177 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 | 1178 | if (old_dir != new_dir) |
1de87444 | 1179 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); |
48ce8b05 ED |
1180 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); |
1181 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); | |
1da177e4 LT |
1182 | if (!S_ISDIR(old_ip->i_mode) && new_ip) |
1183 | IWRITE_UNLOCK(new_ip); | |
1184 | jfs_error(new_ip->i_sb, | |
eb8630d7 | 1185 | "new_ip->i_nlink != 0\n"); |
1da177e4 LT |
1186 | return -EIO; |
1187 | } | |
1188 | tblk = tid_to_tblock(tid); | |
1189 | tblk->xflag |= COMMIT_DELETE; | |
1190 | tblk->u.ip = new_ip; | |
1191 | } else if (new_ip->i_nlink == 0) { | |
1192 | assert(!test_cflag(COMMIT_Nolink, new_ip)); | |
1193 | /* free block resources */ | |
1194 | if ((new_size = commitZeroLink(tid, new_ip)) < 0) { | |
1195 | txAbort(tid, 1); /* Marks FS Dirty */ | |
63f83c9f | 1196 | rc = new_size; |
26456955 | 1197 | goto out_tx; |
1da177e4 LT |
1198 | } |
1199 | tblk = tid_to_tblock(tid); | |
1200 | tblk->xflag |= COMMIT_DELETE; | |
1201 | tblk->u.ip = new_ip; | |
1202 | } else { | |
078cd827 | 1203 | new_ip->i_ctime = current_time(new_ip); |
1da177e4 LT |
1204 | mark_inode_dirty(new_ip); |
1205 | } | |
1206 | } else { | |
1207 | /* | |
1208 | * Add new directory entry | |
1209 | */ | |
1210 | rc = dtSearch(new_dir, &new_dname, &ino, &btstack, | |
1211 | JFS_CREATE); | |
1212 | if (rc) { | |
6ed71e98 JP |
1213 | jfs_err("jfs_rename didn't expect dtSearch to fail w/rc = %d", |
1214 | rc); | |
26456955 | 1215 | goto out_tx; |
1da177e4 LT |
1216 | } |
1217 | ||
1218 | ino = old_ip->i_ino; | |
1219 | rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack); | |
1220 | if (rc) { | |
1221 | if (rc == -EIO) | |
1222 | jfs_err("jfs_rename: dtInsert returned -EIO"); | |
26456955 | 1223 | goto out_tx; |
1da177e4 LT |
1224 | } |
1225 | if (S_ISDIR(old_ip->i_mode)) | |
d8c76e6f | 1226 | inc_nlink(new_dir); |
1da177e4 LT |
1227 | } |
1228 | /* | |
1229 | * Remove old directory entry | |
1230 | */ | |
1231 | ||
1232 | ino = old_ip->i_ino; | |
1233 | rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE); | |
1234 | if (rc) { | |
1235 | jfs_err("jfs_rename did not expect dtDelete to return rc = %d", | |
1236 | rc); | |
1237 | txAbort(tid, 1); /* Marks Filesystem dirty */ | |
26456955 | 1238 | goto out_tx; |
1da177e4 LT |
1239 | } |
1240 | if (S_ISDIR(old_ip->i_mode)) { | |
9a53c3a7 | 1241 | drop_nlink(old_dir); |
1da177e4 LT |
1242 | if (old_dir != new_dir) { |
1243 | /* | |
1244 | * Change inode number of parent for moved directory | |
1245 | */ | |
1246 | ||
1247 | JFS_IP(old_ip)->i_dtroot.header.idotdot = | |
1248 | cpu_to_le32(new_dir->i_ino); | |
1249 | ||
1250 | /* Linelock header of dtree */ | |
1251 | tlck = txLock(tid, old_ip, | |
1252 | (struct metapage *) &JFS_IP(old_ip)->bxflag, | |
1253 | tlckDTREE | tlckBTROOT | tlckRELINK); | |
1254 | dtlck = (struct dt_lock *) & tlck->lock; | |
1255 | ASSERT(dtlck->index == 0); | |
1256 | lv = & dtlck->lv[0]; | |
1257 | lv->offset = 0; | |
1258 | lv->length = 1; | |
1259 | dtlck->index++; | |
1260 | } | |
1261 | } | |
1262 | ||
1263 | /* | |
1264 | * Update ctime on changed/moved inodes & mark dirty | |
1265 | */ | |
078cd827 | 1266 | old_ip->i_ctime = current_time(old_ip); |
1da177e4 LT |
1267 | mark_inode_dirty(old_ip); |
1268 | ||
c2050a45 | 1269 | new_dir->i_ctime = new_dir->i_mtime = current_time(new_dir); |
1da177e4 LT |
1270 | mark_inode_dirty(new_dir); |
1271 | ||
1272 | /* Build list of inodes modified by this transaction */ | |
1273 | ipcount = 0; | |
1274 | iplist[ipcount++] = old_ip; | |
1275 | if (new_ip) | |
1276 | iplist[ipcount++] = new_ip; | |
1277 | iplist[ipcount++] = old_dir; | |
1278 | ||
1279 | if (old_dir != new_dir) { | |
1280 | iplist[ipcount++] = new_dir; | |
078cd827 | 1281 | old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir); |
1da177e4 LT |
1282 | mark_inode_dirty(old_dir); |
1283 | } | |
1284 | ||
1285 | /* | |
1286 | * Incomplete truncate of file data can | |
1287 | * result in timing problems unless we synchronously commit the | |
1288 | * transaction. | |
1289 | */ | |
1290 | if (new_size) | |
1291 | commit_flag = COMMIT_SYNC; | |
1292 | else | |
1293 | commit_flag = 0; | |
1294 | ||
1295 | rc = txCommit(tid, ipcount, iplist, commit_flag); | |
1296 | ||
26456955 | 1297 | out_tx: |
1da177e4 | 1298 | txEnd(tid); |
1da177e4 | 1299 | if (new_ip) |
1de87444 | 1300 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
48ce8b05 ED |
1301 | if (old_dir != new_dir) |
1302 | mutex_unlock(&JFS_IP(old_dir)->commit_mutex); | |
1303 | mutex_unlock(&JFS_IP(old_ip)->commit_mutex); | |
1304 | mutex_unlock(&JFS_IP(new_dir)->commit_mutex); | |
1da177e4 LT |
1305 | |
1306 | while (new_size && (rc == 0)) { | |
1307 | tid = txBegin(new_ip->i_sb, 0); | |
1de87444 | 1308 | mutex_lock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 LT |
1309 | new_size = xtTruncate_pmap(tid, new_ip, new_size); |
1310 | if (new_size < 0) { | |
1311 | txAbort(tid, 1); | |
63f83c9f | 1312 | rc = new_size; |
1da177e4 LT |
1313 | } else |
1314 | rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC); | |
1315 | txEnd(tid); | |
1de87444 | 1316 | mutex_unlock(&JFS_IP(new_ip)->commit_mutex); |
1da177e4 LT |
1317 | } |
1318 | if (new_ip && (new_ip->i_nlink == 0)) | |
1319 | set_cflag(COMMIT_Nolink, new_ip); | |
1da177e4 LT |
1320 | /* |
1321 | * Truncating the directory index table is not guaranteed. It | |
1322 | * may need to be done iteratively | |
1323 | */ | |
1324 | if (test_cflag(COMMIT_Stale, old_dir)) { | |
1325 | if (old_dir->i_size > 1) | |
1326 | jfs_truncate_nolock(old_dir, 0); | |
1327 | ||
1328 | clear_cflag(COMMIT_Stale, old_dir); | |
1329 | } | |
acc84b05 | 1330 | out_unlock: |
26456955 DK |
1331 | if (new_ip && !S_ISDIR(new_ip->i_mode)) |
1332 | IWRITE_UNLOCK(new_ip); | |
1333 | out3: | |
1334 | free_UCSname(&new_dname); | |
1335 | out2: | |
1336 | free_UCSname(&old_dname); | |
1337 | out1: | |
1da177e4 LT |
1338 | jfs_info("jfs_rename: returning %d", rc); |
1339 | return rc; | |
1340 | } | |
1341 | ||
1342 | ||
1343 | /* | |
f720e3ba | 1344 | * NAME: jfs_mknod |
1da177e4 | 1345 | * |
f720e3ba | 1346 | * FUNCTION: Create a special file (device) |
1da177e4 | 1347 | */ |
549c7297 CB |
1348 | static int jfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, |
1349 | struct dentry *dentry, umode_t mode, dev_t rdev) | |
1da177e4 LT |
1350 | { |
1351 | struct jfs_inode_info *jfs_ip; | |
1352 | struct btstack btstack; | |
1353 | struct component_name dname; | |
1354 | ino_t ino; | |
1355 | struct inode *ip; | |
1356 | struct inode *iplist[2]; | |
1357 | int rc; | |
1358 | tid_t tid; | |
1359 | struct tblock *tblk; | |
1360 | ||
a455589f | 1361 | jfs_info("jfs_mknod: %pd", dentry); |
1da177e4 | 1362 | |
acc84b05 DK |
1363 | rc = dquot_initialize(dir); |
1364 | if (rc) | |
1365 | goto out; | |
907f4554 | 1366 | |
1da177e4 LT |
1367 | if ((rc = get_UCSname(&dname, dentry))) |
1368 | goto out; | |
1369 | ||
1370 | ip = ialloc(dir, mode); | |
087387f9 AM |
1371 | if (IS_ERR(ip)) { |
1372 | rc = PTR_ERR(ip); | |
1da177e4 LT |
1373 | goto out1; |
1374 | } | |
1375 | jfs_ip = JFS_IP(ip); | |
1376 | ||
1377 | tid = txBegin(dir->i_sb, 0); | |
1378 | ||
82d5b9a7 DK |
1379 | mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT); |
1380 | mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD); | |
1da177e4 | 1381 | |
4f4b401b DK |
1382 | rc = jfs_init_acl(tid, ip, dir); |
1383 | if (rc) | |
1da177e4 LT |
1384 | goto out3; |
1385 | ||
2a7dba39 | 1386 | rc = jfs_init_security(tid, ip, dir, &dentry->d_name); |
1d15b10f DK |
1387 | if (rc) { |
1388 | txAbort(tid, 0); | |
1389 | goto out3; | |
1390 | } | |
1391 | ||
4f4b401b DK |
1392 | if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) { |
1393 | txAbort(tid, 0); | |
1394 | goto out3; | |
1395 | } | |
1396 | ||
1da177e4 LT |
1397 | tblk = tid_to_tblock(tid); |
1398 | tblk->xflag |= COMMIT_CREATE; | |
1399 | tblk->ino = ip->i_ino; | |
1400 | tblk->u.ixpxd = JFS_IP(ip)->ixpxd; | |
1401 | ||
1402 | ino = ip->i_ino; | |
4f4b401b DK |
1403 | if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) { |
1404 | txAbort(tid, 0); | |
1da177e4 | 1405 | goto out3; |
4f4b401b | 1406 | } |
1da177e4 LT |
1407 | |
1408 | ip->i_op = &jfs_file_inode_operations; | |
1409 | jfs_ip->dev = new_encode_dev(rdev); | |
1410 | init_special_inode(ip, ip->i_mode, rdev); | |
1411 | ||
1da177e4 LT |
1412 | mark_inode_dirty(ip); |
1413 | ||
078cd827 | 1414 | dir->i_ctime = dir->i_mtime = current_time(dir); |
1da177e4 LT |
1415 | |
1416 | mark_inode_dirty(dir); | |
1417 | ||
1418 | iplist[0] = dir; | |
1419 | iplist[1] = ip; | |
1420 | rc = txCommit(tid, 2, iplist, 0); | |
1421 | ||
1422 | out3: | |
1423 | txEnd(tid); | |
1de87444 IM |
1424 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1425 | mutex_unlock(&JFS_IP(dir)->commit_mutex); | |
1da177e4 | 1426 | if (rc) { |
4f4b401b | 1427 | free_ea_wmap(ip); |
6d6b77f1 | 1428 | clear_nlink(ip); |
a6cbedfa | 1429 | discard_new_inode(ip); |
1f3403fa | 1430 | } else { |
1e2e547a | 1431 | d_instantiate_new(dentry, ip); |
1f3403fa | 1432 | } |
1da177e4 LT |
1433 | |
1434 | out1: | |
1435 | free_UCSname(&dname); | |
1436 | ||
1da177e4 LT |
1437 | out: |
1438 | jfs_info("jfs_mknod: returning %d", rc); | |
1439 | return rc; | |
1440 | } | |
1441 | ||
00cd8dd3 | 1442 | static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags) |
1da177e4 LT |
1443 | { |
1444 | struct btstack btstack; | |
1445 | ino_t inum; | |
1446 | struct inode *ip; | |
1447 | struct component_name key; | |
1da177e4 LT |
1448 | int rc; |
1449 | ||
a455589f | 1450 | jfs_info("jfs_lookup: name = %pd", dentry); |
79ac5a46 AV |
1451 | |
1452 | if ((rc = get_UCSname(&key, dentry))) | |
1453 | return ERR_PTR(rc); | |
1454 | rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP); | |
1455 | free_UCSname(&key); | |
1456 | if (rc == -ENOENT) { | |
1457 | ip = NULL; | |
1458 | } else if (rc) { | |
1459 | jfs_err("jfs_lookup: dtSearch returned %d", rc); | |
1460 | ip = ERR_PTR(rc); | |
1461 | } else { | |
1462 | ip = jfs_iget(dip->i_sb, inum); | |
1463 | if (IS_ERR(ip)) | |
1464 | jfs_err("jfs_lookup: iget failed on inum %d", (uint)inum); | |
1da177e4 LT |
1465 | } |
1466 | ||
94b77bd8 | 1467 | return d_splice_alias(ip, dentry); |
1da177e4 LT |
1468 | } |
1469 | ||
d425de70 CH |
1470 | static struct inode *jfs_nfs_get_inode(struct super_block *sb, |
1471 | u64 ino, u32 generation) | |
5ca29607 | 1472 | { |
5ca29607 | 1473 | struct inode *inode; |
5ca29607 CH |
1474 | |
1475 | if (ino == 0) | |
1476 | return ERR_PTR(-ESTALE); | |
eab1df71 DH |
1477 | inode = jfs_iget(sb, ino); |
1478 | if (IS_ERR(inode)) | |
1479 | return ERR_CAST(inode); | |
5ca29607 | 1480 | |
eab1df71 | 1481 | if (generation && inode->i_generation != generation) { |
d425de70 CH |
1482 | iput(inode); |
1483 | return ERR_PTR(-ESTALE); | |
5ca29607 CH |
1484 | } |
1485 | ||
d425de70 CH |
1486 | return inode; |
1487 | } | |
5ca29607 | 1488 | |
d425de70 CH |
1489 | struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid, |
1490 | int fh_len, int fh_type) | |
1491 | { | |
1492 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
1493 | jfs_nfs_get_inode); | |
1494 | } | |
1495 | ||
1496 | struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
1497 | int fh_len, int fh_type) | |
1498 | { | |
1499 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
1500 | jfs_nfs_get_inode); | |
5ca29607 CH |
1501 | } |
1502 | ||
1da177e4 LT |
1503 | struct dentry *jfs_get_parent(struct dentry *dentry) |
1504 | { | |
1da177e4 LT |
1505 | unsigned long parent_ino; |
1506 | ||
1507 | parent_ino = | |
2b0143b5 | 1508 | le32_to_cpu(JFS_IP(d_inode(dentry))->i_dtroot.header.idotdot); |
1da177e4 | 1509 | |
fc64005c | 1510 | return d_obtain_alias(jfs_iget(dentry->d_sb, parent_ino)); |
1da177e4 LT |
1511 | } |
1512 | ||
92e1d5be | 1513 | const struct inode_operations jfs_dir_inode_operations = { |
1da177e4 LT |
1514 | .create = jfs_create, |
1515 | .lookup = jfs_lookup, | |
1516 | .link = jfs_link, | |
1517 | .unlink = jfs_unlink, | |
1518 | .symlink = jfs_symlink, | |
1519 | .mkdir = jfs_mkdir, | |
1520 | .rmdir = jfs_rmdir, | |
1521 | .mknod = jfs_mknod, | |
1522 | .rename = jfs_rename, | |
1da177e4 | 1523 | .listxattr = jfs_listxattr, |
1da177e4 | 1524 | .setattr = jfs_setattr, |
2ca58e30 MS |
1525 | .fileattr_get = jfs_fileattr_get, |
1526 | .fileattr_set = jfs_fileattr_set, | |
759bfee6 | 1527 | #ifdef CONFIG_JFS_POSIX_ACL |
cac2f8b8 | 1528 | .get_inode_acl = jfs_get_acl, |
2cc6a5a0 | 1529 | .set_acl = jfs_set_acl, |
1da177e4 LT |
1530 | #endif |
1531 | }; | |
1532 | ||
4b6f5d20 | 1533 | const struct file_operations jfs_dir_operations = { |
1da177e4 | 1534 | .read = generic_read_dir, |
070a0ebf | 1535 | .iterate = jfs_readdir, |
1da177e4 | 1536 | .fsync = jfs_fsync, |
baab81fa | 1537 | .unlocked_ioctl = jfs_ioctl, |
2ca58e30 | 1538 | .compat_ioctl = compat_ptr_ioctl, |
3222a3e5 | 1539 | .llseek = generic_file_llseek, |
1da177e4 LT |
1540 | }; |
1541 | ||
da53be12 | 1542 | static int jfs_ci_hash(const struct dentry *dir, struct qstr *this) |
1da177e4 LT |
1543 | { |
1544 | unsigned long hash; | |
1545 | int i; | |
1546 | ||
8387ff25 | 1547 | hash = init_name_hash(dir); |
1da177e4 LT |
1548 | for (i=0; i < this->len; i++) |
1549 | hash = partial_name_hash(tolower(this->name[i]), hash); | |
1550 | this->hash = end_name_hash(hash); | |
1551 | ||
1552 | return 0; | |
1553 | } | |
1554 | ||
6fa67e70 | 1555 | static int jfs_ci_compare(const struct dentry *dentry, |
621e155a | 1556 | unsigned int len, const char *str, const struct qstr *name) |
1da177e4 LT |
1557 | { |
1558 | int i, result = 1; | |
1559 | ||
621e155a | 1560 | if (len != name->len) |
1da177e4 | 1561 | goto out; |
621e155a NP |
1562 | for (i=0; i < len; i++) { |
1563 | if (tolower(str[i]) != tolower(name->name[i])) | |
1da177e4 LT |
1564 | goto out; |
1565 | } | |
1566 | result = 0; | |
2bc334dc NP |
1567 | out: |
1568 | return result; | |
1569 | } | |
1da177e4 | 1570 | |
0b728e19 | 1571 | static int jfs_ci_revalidate(struct dentry *dentry, unsigned int flags) |
2bc334dc | 1572 | { |
1da177e4 | 1573 | /* |
2bc334dc NP |
1574 | * This is not negative dentry. Always valid. |
1575 | * | |
1576 | * Note, rename() to existing directory entry will have ->d_inode, | |
1577 | * and will use existing name which isn't specified name by user. | |
1578 | * | |
1579 | * We may be able to drop this positive dentry here. But dropping | |
1580 | * positive dentry isn't good idea. So it's unsupported like | |
1581 | * rename("filename", "FILENAME") for now. | |
1da177e4 | 1582 | */ |
2b0143b5 | 1583 | if (d_really_is_positive(dentry)) |
2bc334dc NP |
1584 | return 1; |
1585 | ||
1586 | /* | |
1587 | * This may be nfsd (or something), anyway, we can't see the | |
1588 | * intent of this. So, since this can be for creation, drop it. | |
1589 | */ | |
0b728e19 | 1590 | if (!flags) |
2bc334dc NP |
1591 | return 0; |
1592 | ||
1593 | /* | |
1594 | * Drop the negative dentry, in order to make sure to use the | |
1595 | * case sensitive name which is specified by user if this is | |
1596 | * for creation. | |
1597 | */ | |
0b728e19 | 1598 | if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) |
407938e7 | 1599 | return 0; |
2bc334dc | 1600 | return 1; |
1da177e4 LT |
1601 | } |
1602 | ||
ad28b4ef | 1603 | const struct dentry_operations jfs_ci_dentry_operations = |
1da177e4 LT |
1604 | { |
1605 | .d_hash = jfs_ci_hash, | |
1606 | .d_compare = jfs_ci_compare, | |
2bc334dc | 1607 | .d_revalidate = jfs_ci_revalidate, |
1da177e4 | 1608 | }; |