blob: eaaf2b511e89a64613bd281f82029ee869358484 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20#include <linux/fs.h>
Nick Piggin2bc334d2011-01-07 17:49:25 +110021#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/ctype.h>
23#include <linux/quotaops.h>
Christoph Hellwigd425de72007-10-21 16:42:09 -070024#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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
Linus Torvalds1da177e2005-04-16 15:20:36 -070036/*
37 * forward references
38 */
Al Viroad28b4e2009-02-20 06:00:49 +000039const struct dentry_operations jfs_ci_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41static s64 commitZeroLink(tid_t, struct inode *);
42
43/*
Dave Kleikamp4f4b4012005-09-01 09:02:43 -050044 * NAME: free_ea_wmap(inode)
45 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -050046 * FUNCTION: free uncommitted extended attributes from working map
Dave Kleikamp4f4b4012005-09-01 09:02:43 -050047 *
48 */
49static 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
61/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 * 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 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -050067 * PARAMETER: dip - parent directory vnode
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 * dentry - dentry of new file
69 * mode - create mode (rwxrwxrwx).
70 * nd- nd struct
71 *
72 * RETURN: Errors from subroutines
73 *
74 */
75static int jfs_create(struct inode *dip, struct dentry *dentry, int mode,
76 struct nameidata *nd)
77{
78 int rc = 0;
79 tid_t tid; /* transaction id */
80 struct inode *ip = NULL; /* child directory inode */
81 ino_t ino;
82 struct component_name dname; /* child directory name */
83 struct btstack btstack;
84 struct inode *iplist[2];
85 struct tblock *tblk;
86
87 jfs_info("jfs_create: dip:0x%p name:%s", dip, dentry->d_name.name);
88
Christoph Hellwig871a2932010-03-03 09:05:07 -050089 dquot_initialize(dip);
Christoph Hellwig907f4552010-03-03 09:05:06 -050090
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 /*
92 * search parent directory for entry/freespace
93 * (dtSearch() returns parent directory page pinned)
94 */
95 if ((rc = get_UCSname(&dname, dentry)))
96 goto out1;
97
98 /*
99 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
100 * block there while holding dtree page, so we allocate the inode &
101 * begin the transaction before we search the directory.
102 */
103 ip = ialloc(dip, mode);
Akinobu Mita087387f2006-09-14 09:22:38 -0500104 if (IS_ERR(ip)) {
105 rc = PTR_ERR(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 goto out2;
107 }
108
109 tid = txBegin(dip->i_sb, 0);
110
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600111 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
112 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500114 rc = jfs_init_acl(tid, ip, dip);
115 if (rc)
116 goto out3;
117
Eric Paris2a7dba32011-02-01 11:05:39 -0500118 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
Dave Kleikamp1d15b10f2005-09-01 09:05:39 -0500119 if (rc) {
120 txAbort(tid, 0);
121 goto out3;
122 }
123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
125 jfs_err("jfs_create: dtSearch returned %d", rc);
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500126 txAbort(tid, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 goto out3;
128 }
129
130 tblk = tid_to_tblock(tid);
131 tblk->xflag |= COMMIT_CREATE;
132 tblk->ino = ip->i_ino;
133 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
134
135 iplist[0] = dip;
136 iplist[1] = ip;
137
138 /*
139 * initialize the child XAD tree root in-line in inode
140 */
141 xtInitRoot(tid, ip);
142
143 /*
144 * create entry in parent directory for child directory
145 * (dtInsert() releases parent directory page)
146 */
147 ino = ip->i_ino;
148 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
149 if (rc == -EIO) {
150 jfs_err("jfs_create: dtInsert returned -EIO");
151 txAbort(tid, 1); /* Marks Filesystem dirty */
152 } else
153 txAbort(tid, 0); /* Filesystem full */
154 goto out3;
155 }
156
157 ip->i_op = &jfs_file_inode_operations;
158 ip->i_fop = &jfs_file_operations;
159 ip->i_mapping->a_ops = &jfs_aops;
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 mark_inode_dirty(ip);
162
163 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
164
165 mark_inode_dirty(dip);
166
167 rc = txCommit(tid, 2, &iplist[0], 0);
168
169 out3:
170 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600171 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500172 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 if (rc) {
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500174 free_ea_wmap(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 ip->i_nlink = 0;
Dave Kleikamp1f3403f2008-12-30 22:08:37 -0600176 unlock_new_inode(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 iput(ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -0600178 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 d_instantiate(dentry, ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -0600180 unlock_new_inode(ip);
181 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182
183 out2:
184 free_UCSname(&dname);
185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 out1:
187
188 jfs_info("jfs_create: rc:%d", rc);
189 return rc;
190}
191
192
193/*
194 * NAME: jfs_mkdir(dip, dentry, mode)
195 *
196 * FUNCTION: create a child directory in the parent directory <dip>
197 * with name = <from dentry> and mode = <mode>
198 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500199 * PARAMETER: dip - parent directory vnode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 * dentry - dentry of child directory
201 * mode - create mode (rwxrwxrwx).
202 *
203 * RETURN: Errors from subroutines
204 *
205 * note:
206 * EACCESS: user needs search+write permission on the parent directory
207 */
208static int jfs_mkdir(struct inode *dip, struct dentry *dentry, int mode)
209{
210 int rc = 0;
211 tid_t tid; /* transaction id */
212 struct inode *ip = NULL; /* child directory inode */
213 ino_t ino;
214 struct component_name dname; /* child directory name */
215 struct btstack btstack;
216 struct inode *iplist[2];
217 struct tblock *tblk;
218
219 jfs_info("jfs_mkdir: dip:0x%p name:%s", dip, dentry->d_name.name);
220
Christoph Hellwig871a2932010-03-03 09:05:07 -0500221 dquot_initialize(dip);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500222
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 /* link count overflow on parent directory ? */
224 if (dip->i_nlink == JFS_LINK_MAX) {
225 rc = -EMLINK;
226 goto out1;
227 }
228
229 /*
230 * search parent directory for entry/freespace
231 * (dtSearch() returns parent directory page pinned)
232 */
233 if ((rc = get_UCSname(&dname, dentry)))
234 goto out1;
235
236 /*
237 * Either iAlloc() or txBegin() may block. Deadlock can occur if we
238 * block there while holding dtree page, so we allocate the inode &
239 * begin the transaction before we search the directory.
240 */
241 ip = ialloc(dip, S_IFDIR | mode);
Akinobu Mita087387f2006-09-14 09:22:38 -0500242 if (IS_ERR(ip)) {
243 rc = PTR_ERR(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 goto out2;
245 }
246
247 tid = txBegin(dip->i_sb, 0);
248
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600249 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
250 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500252 rc = jfs_init_acl(tid, ip, dip);
253 if (rc)
254 goto out3;
255
Eric Paris2a7dba32011-02-01 11:05:39 -0500256 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
Dave Kleikamp1d15b10f2005-09-01 09:05:39 -0500257 if (rc) {
258 txAbort(tid, 0);
259 goto out3;
260 }
261
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 if ((rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE))) {
263 jfs_err("jfs_mkdir: dtSearch returned %d", rc);
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500264 txAbort(tid, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 goto out3;
266 }
267
268 tblk = tid_to_tblock(tid);
269 tblk->xflag |= COMMIT_CREATE;
270 tblk->ino = ip->i_ino;
271 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
272
273 iplist[0] = dip;
274 iplist[1] = ip;
275
276 /*
277 * initialize the child directory in-line in inode
278 */
279 dtInitRoot(tid, ip, dip->i_ino);
280
281 /*
282 * create entry in parent directory for child directory
283 * (dtInsert() releases parent directory page)
284 */
285 ino = ip->i_ino;
286 if ((rc = dtInsert(tid, dip, &dname, &ino, &btstack))) {
287 if (rc == -EIO) {
288 jfs_err("jfs_mkdir: dtInsert returned -EIO");
289 txAbort(tid, 1); /* Marks Filesystem dirty */
290 } else
291 txAbort(tid, 0); /* Filesystem full */
292 goto out3;
293 }
294
295 ip->i_nlink = 2; /* for '.' */
296 ip->i_op = &jfs_dir_inode_operations;
297 ip->i_fop = &jfs_dir_operations;
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 mark_inode_dirty(ip);
300
301 /* update parent directory inode */
Dave Hansend8c76e62006-09-30 23:29:04 -0700302 inc_nlink(dip); /* for '..' from child directory */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
304 mark_inode_dirty(dip);
305
306 rc = txCommit(tid, 2, &iplist[0], 0);
307
308 out3:
309 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600310 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500311 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 if (rc) {
Dave Kleikamp4f4b4012005-09-01 09:02:43 -0500313 free_ea_wmap(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314 ip->i_nlink = 0;
Dave Kleikamp1f3403f2008-12-30 22:08:37 -0600315 unlock_new_inode(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 iput(ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -0600317 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 d_instantiate(dentry, ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -0600319 unlock_new_inode(ip);
320 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 out2:
323 free_UCSname(&dname);
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325
326 out1:
327
328 jfs_info("jfs_mkdir: rc:%d", rc);
329 return rc;
330}
331
332/*
333 * NAME: jfs_rmdir(dip, dentry)
334 *
335 * FUNCTION: remove a link to child directory
336 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500337 * PARAMETER: dip - parent inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 * dentry - child directory dentry
339 *
340 * RETURN: -EINVAL - if name is . or ..
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500341 * -EINVAL - if . or .. exist but are invalid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 * errors from subroutines
343 *
344 * note:
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500345 * if other threads have the directory open when the last link
346 * is removed, the "." and ".." entries, if present, are removed before
347 * rmdir() returns and no new entries may be created in the directory,
348 * but the directory is not removed until the last reference to
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 * the directory is released (cf.unlink() of regular file).
350 */
351static int jfs_rmdir(struct inode *dip, struct dentry *dentry)
352{
353 int rc;
354 tid_t tid; /* transaction id */
355 struct inode *ip = dentry->d_inode;
356 ino_t ino;
357 struct component_name dname;
358 struct inode *iplist[2];
359 struct tblock *tblk;
360
361 jfs_info("jfs_rmdir: dip:0x%p name:%s", dip, dentry->d_name.name);
362
363 /* Init inode for quota operations. */
Christoph Hellwig871a2932010-03-03 09:05:07 -0500364 dquot_initialize(dip);
365 dquot_initialize(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
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
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600379 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
380 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
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);
Ingo Molnar1de87442006-01-24 15:22:50 -0600398 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500399 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 goto out2;
402 }
403
404 /* update parent directory's link count corresponding
405 * to ".." entry of the target directory deleted
406 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700408 inode_dec_link_count(dip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
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 */
Dave Hansence71ec32006-09-30 23:29:06 -0700428 clear_nlink(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 mark_inode_dirty(ip);
430
431 rc = txCommit(tid, 2, &iplist[0], 0);
432
433 txEnd(tid);
434
Ingo Molnar1de87442006-01-24 15:22:50 -0600435 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500436 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437
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 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500460 * FUNCTION: remove a link to object <vp> named by <name>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 * from parent directory <dvp>
462 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500463 * PARAMETER: dip - inode of parent directory
464 * dentry - dentry of object to be removed
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 *
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 */
477static int jfs_unlink(struct inode *dip, struct dentry *dentry)
478{
479 int rc;
480 tid_t tid; /* transaction id */
481 struct inode *ip = dentry->d_inode;
482 ino_t ino;
483 struct component_name dname; /* object name */
484 struct inode *iplist[2];
485 struct tblock *tblk;
486 s64 new_size = 0;
487 int commit_flag;
488
489 jfs_info("jfs_unlink: dip:0x%p name:%s", dip, dentry->d_name.name);
490
491 /* Init inode for quota operations. */
Christoph Hellwig871a2932010-03-03 09:05:07 -0500492 dquot_initialize(dip);
493 dquot_initialize(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494
495 if ((rc = get_UCSname(&dname, dentry)))
496 goto out;
497
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600498 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
500 tid = txBegin(dip->i_sb, 0);
501
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600502 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
503 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 iplist[0] = dip;
506 iplist[1] = ip;
507
508 /*
509 * delete the entry of target file from parent directory
510 */
511 ino = ip->i_ino;
512 if ((rc = dtDelete(tid, dip, &dname, &ino, JFS_REMOVE))) {
513 jfs_err("jfs_unlink: dtDelete returned %d", rc);
514 if (rc == -EIO)
515 txAbort(tid, 1); /* Marks FS Dirty */
516 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600517 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500518 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 IWRITE_UNLOCK(ip);
520 goto out1;
521 }
522
523 ASSERT(ip->i_nlink);
524
525 ip->i_ctime = dip->i_ctime = dip->i_mtime = CURRENT_TIME;
526 mark_inode_dirty(dip);
527
528 /* update target's inode */
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700529 inode_dec_link_count(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530
531 /*
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500532 * commit zero link count object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 */
534 if (ip->i_nlink == 0) {
535 assert(!test_cflag(COMMIT_Nolink, ip));
536 /* free block resources */
537 if ((new_size = commitZeroLink(tid, ip)) < 0) {
538 txAbort(tid, 1); /* Marks FS Dirty */
539 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600540 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500541 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 IWRITE_UNLOCK(ip);
543 rc = new_size;
544 goto out1;
545 }
546 tblk = tid_to_tblock(tid);
547 tblk->xflag |= COMMIT_DELETE;
548 tblk->u.ip = ip;
549 }
550
551 /*
552 * Incomplete truncate of file data can
553 * result in timing problems unless we synchronously commit the
554 * transaction.
555 */
556 if (new_size)
557 commit_flag = COMMIT_SYNC;
558 else
559 commit_flag = 0;
560
561 /*
562 * If xtTruncate was incomplete, commit synchronously to avoid
563 * timing complications
564 */
565 rc = txCommit(tid, 2, &iplist[0], commit_flag);
566
567 txEnd(tid);
568
Ingo Molnar1de87442006-01-24 15:22:50 -0600569 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500570 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
572 while (new_size && (rc == 0)) {
573 tid = txBegin(dip->i_sb, 0);
Ingo Molnar1de87442006-01-24 15:22:50 -0600574 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 new_size = xtTruncate_pmap(tid, ip, new_size);
576 if (new_size < 0) {
577 txAbort(tid, 1); /* Marks FS Dirty */
578 rc = new_size;
579 } else
580 rc = txCommit(tid, 2, &iplist[0], COMMIT_SYNC);
581 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600582 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583 }
584
585 if (ip->i_nlink == 0)
586 set_cflag(COMMIT_Nolink, ip);
587
588 IWRITE_UNLOCK(ip);
589
590 /*
591 * Truncating the directory index table is not guaranteed. It
592 * may need to be done iteratively
593 */
594 if (test_cflag(COMMIT_Stale, dip)) {
595 if (dip->i_size > 1)
596 jfs_truncate_nolock(dip, 0);
597
598 clear_cflag(COMMIT_Stale, dip);
599 }
600
601 out1:
602 free_UCSname(&dname);
603 out:
604 jfs_info("jfs_unlink: rc:%d", rc);
605 return rc;
606}
607
608/*
609 * NAME: commitZeroLink()
610 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500611 * FUNCTION: for non-directory, called by jfs_remove(),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 * truncate a regular file, directory or symbolic
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500613 * link to zero length. return 0 if type is not
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 * one of these.
615 *
616 * if the file is currently associated with a VM segment
617 * only permanent disk and inode map resources are freed,
618 * and neither the inode nor indirect blocks are modified
619 * so that the resources can be later freed in the work
620 * map by ctrunc1.
621 * if there is no VM segment on entry, the resources are
622 * freed in both work and permanent map.
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500623 * (? for temporary file - memory object is cached even
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 * after no reference:
625 * reference count > 0 - )
626 *
627 * PARAMETERS: cd - pointer to commit data structure.
628 * current inode is the one to truncate.
629 *
630 * RETURN: Errors from subroutines
631 */
632static s64 commitZeroLink(tid_t tid, struct inode *ip)
633{
634 int filetype;
635 struct tblock *tblk;
636
637 jfs_info("commitZeroLink: tid = %d, ip = 0x%p", tid, ip);
638
639 filetype = ip->i_mode & S_IFMT;
640 switch (filetype) {
641 case S_IFREG:
642 break;
643 case S_IFLNK:
644 /* fast symbolic link */
645 if (ip->i_size < IDATASIZE) {
646 ip->i_size = 0;
647 return 0;
648 }
649 break;
650 default:
651 assert(filetype != S_IFDIR);
652 return 0;
653 }
654
655 set_cflag(COMMIT_Freewmap, ip);
656
657 /* mark transaction of block map update type */
658 tblk = tid_to_tblock(tid);
659 tblk->xflag |= COMMIT_PMAP;
660
661 /*
662 * free EA
663 */
664 if (JFS_IP(ip)->ea.flag & DXD_EXTENT)
665 /* acquire maplock on EA to be freed from block map */
666 txEA(tid, ip, &JFS_IP(ip)->ea, NULL);
667
668 /*
669 * free ACL
670 */
671 if (JFS_IP(ip)->acl.flag & DXD_EXTENT)
672 /* acquire maplock on EA to be freed from block map */
673 txEA(tid, ip, &JFS_IP(ip)->acl, NULL);
674
675 /*
676 * free xtree/data (truncate to zero length):
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500677 * free xtree/data pages from cache if COMMIT_PWMAP,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 * free xtree/data blocks from persistent block map, and
679 * free xtree/data blocks from working block map if COMMIT_PWMAP;
680 */
681 if (ip->i_size)
682 return xtTruncate_pmap(tid, ip, 0);
683
684 return 0;
685}
686
687
688/*
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500689 * NAME: jfs_free_zero_link()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500691 * FUNCTION: for non-directory, called by iClose(),
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500692 * free resources of a file from cache and WORKING map
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 * for a file previously committed with zero link count
694 * while associated with a pager object,
695 *
696 * PARAMETER: ip - pointer to inode of file.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697 */
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500698void jfs_free_zero_link(struct inode *ip)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 int type;
701
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500702 jfs_info("jfs_free_zero_link: ip = 0x%p", ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704 /* return if not reg or symbolic link or if size is
705 * already ok.
706 */
707 type = ip->i_mode & S_IFMT;
708
709 switch (type) {
710 case S_IFREG:
711 break;
712 case S_IFLNK:
713 /* if its contained in inode nothing to do */
714 if (ip->i_size < IDATASIZE)
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500715 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 break;
717 default:
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500718 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 }
720
721 /*
722 * free EA
723 */
724 if (JFS_IP(ip)->ea.flag & DXD_EXTENT) {
725 s64 xaddr = addressDXD(&JFS_IP(ip)->ea);
726 int xlen = lengthDXD(&JFS_IP(ip)->ea);
727 struct maplock maplock; /* maplock for COMMIT_WMAP */
728 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
729
730 /* free EA pages from cache */
731 invalidate_dxd_metapages(ip, JFS_IP(ip)->ea);
732
733 /* free EA extent from working block map */
734 maplock.index = 1;
735 pxdlock = (struct pxd_lock *) & maplock;
736 pxdlock->flag = mlckFREEPXD;
737 PXDaddress(&pxdlock->pxd, xaddr);
738 PXDlength(&pxdlock->pxd, xlen);
739 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
740 }
741
742 /*
743 * free ACL
744 */
745 if (JFS_IP(ip)->acl.flag & DXD_EXTENT) {
746 s64 xaddr = addressDXD(&JFS_IP(ip)->acl);
747 int xlen = lengthDXD(&JFS_IP(ip)->acl);
748 struct maplock maplock; /* maplock for COMMIT_WMAP */
749 struct pxd_lock *pxdlock; /* maplock for COMMIT_WMAP */
750
751 invalidate_dxd_metapages(ip, JFS_IP(ip)->acl);
752
753 /* free ACL extent from working block map */
754 maplock.index = 1;
755 pxdlock = (struct pxd_lock *) & maplock;
756 pxdlock->flag = mlckFREEPXD;
757 PXDaddress(&pxdlock->pxd, xaddr);
758 PXDlength(&pxdlock->pxd, xlen);
759 txFreeMap(ip, pxdlock, NULL, COMMIT_WMAP);
760 }
761
762 /*
763 * free xtree/data (truncate to zero length):
764 * free xtree/data pages from cache, and
765 * free xtree/data blocks from working block map;
766 */
767 if (ip->i_size)
Dave Kleikamp1868f4a2005-05-04 15:29:35 -0500768 xtTruncate(0, ip, 0, COMMIT_WMAP);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769}
770
771/*
772 * NAME: jfs_link(vp, dvp, name, crp)
773 *
774 * FUNCTION: create a link to <vp> by the name = <name>
775 * in the parent directory <dvp>
776 *
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500777 * PARAMETER: vp - target object
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 * dvp - parent directory of new link
779 * name - name of new link to target object
780 * crp - credential
781 *
782 * RETURN: Errors from subroutines
783 *
784 * note:
785 * JFS does NOT support link() on directories (to prevent circular
786 * path in the directory hierarchy);
787 * EPERM: the target object is a directory, and either the caller
788 * does not have appropriate privileges or the implementation prohibits
789 * using link() on directories [XPG4.2].
790 *
791 * JFS does NOT support links between file systems:
792 * EXDEV: target object and new link are on different file systems and
793 * implementation does not support links between file systems [XPG4.2].
794 */
795static int jfs_link(struct dentry *old_dentry,
796 struct inode *dir, struct dentry *dentry)
797{
798 int rc;
799 tid_t tid;
800 struct inode *ip = old_dentry->d_inode;
801 ino_t ino;
802 struct component_name dname;
803 struct btstack btstack;
804 struct inode *iplist[2];
805
806 jfs_info("jfs_link: %s %s", old_dentry->d_name.name,
807 dentry->d_name.name);
808
809 if (ip->i_nlink == JFS_LINK_MAX)
810 return -EMLINK;
811
Christoph Hellwig871a2932010-03-03 09:05:07 -0500812 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500813
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 tid = txBegin(ip->i_sb, 0);
815
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600816 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
817 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818
819 /*
820 * scan parent directory for entry/freespace
821 */
822 if ((rc = get_UCSname(&dname, dentry)))
823 goto out;
824
825 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE)))
826 goto free_dname;
827
828 /*
829 * create entry for new link in parent directory
830 */
831 ino = ip->i_ino;
832 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack)))
833 goto free_dname;
834
835 /* update object inode */
Dave Hansend8c76e62006-09-30 23:29:04 -0700836 inc_nlink(ip); /* for new link */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 ip->i_ctime = CURRENT_TIME;
Dave Kleikamp988a6492005-10-31 16:53:04 -0600838 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 mark_inode_dirty(dir);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400840 ihold(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841
842 iplist[0] = ip;
843 iplist[1] = dir;
844 rc = txCommit(tid, 2, &iplist[0], 0);
845
846 if (rc) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700847 ip->i_nlink--; /* never instantiated */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 iput(ip);
849 } else
850 d_instantiate(dentry, ip);
851
852 free_dname:
853 free_UCSname(&dname);
854
855 out:
856 txEnd(tid);
857
Ingo Molnar1de87442006-01-24 15:22:50 -0600858 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -0500859 mutex_unlock(&JFS_IP(dir)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860
861 jfs_info("jfs_link: rc:%d", rc);
862 return rc;
863}
864
865/*
866 * NAME: jfs_symlink(dip, dentry, name)
867 *
868 * FUNCTION: creates a symbolic link to <symlink> by name <name>
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500869 * in directory <dip>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700870 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -0500871 * PARAMETER: dip - parent directory vnode
872 * dentry - dentry of symbolic link
873 * name - the path name of the existing object
874 * that will be the source of the link
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 *
876 * RETURN: errors from subroutines
877 *
878 * note:
879 * ENAMETOOLONG: pathname resolution of a symbolic link produced
880 * an intermediate result whose length exceeds PATH_MAX [XPG4.2]
881*/
882
883static int jfs_symlink(struct inode *dip, struct dentry *dentry,
884 const char *name)
885{
886 int rc;
887 tid_t tid;
888 ino_t ino = 0;
889 struct component_name dname;
890 int ssize; /* source pathname size */
891 struct btstack btstack;
892 struct inode *ip = dentry->d_inode;
893 unchar *i_fastsymlink;
894 s64 xlen = 0;
895 int bmask = 0, xsize;
896 s64 extent = 0, xaddr;
897 struct metapage *mp;
898 struct super_block *sb;
899 struct tblock *tblk;
900
901 struct inode *iplist[2];
902
903 jfs_info("jfs_symlink: dip:0x%p name:%s", dip, name);
904
Christoph Hellwig871a2932010-03-03 09:05:07 -0500905 dquot_initialize(dip);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500906
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 ssize = strlen(name) + 1;
908
909 /*
910 * search parent directory for entry/freespace
911 * (dtSearch() returns parent directory page pinned)
912 */
913
914 if ((rc = get_UCSname(&dname, dentry)))
915 goto out1;
916
917 /*
918 * allocate on-disk/in-memory inode for symbolic link:
919 * (iAlloc() returns new, locked inode)
920 */
921 ip = ialloc(dip, S_IFLNK | 0777);
Akinobu Mita087387f2006-09-14 09:22:38 -0500922 if (IS_ERR(ip)) {
923 rc = PTR_ERR(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700924 goto out2;
925 }
926
927 tid = txBegin(dip->i_sb, 0);
928
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600929 mutex_lock_nested(&JFS_IP(dip)->commit_mutex, COMMIT_MUTEX_PARENT);
930 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
Eric Paris2a7dba32011-02-01 11:05:39 -0500932 rc = jfs_init_security(tid, ip, dip, &dentry->d_name);
Dave Kleikamp1d15b10f2005-09-01 09:05:39 -0500933 if (rc)
934 goto out3;
935
Linus Torvalds1da177e2005-04-16 15:20:36 -0700936 tblk = tid_to_tblock(tid);
937 tblk->xflag |= COMMIT_CREATE;
938 tblk->ino = ip->i_ino;
939 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
940
941 /* fix symlink access permission
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500942 * (dir_create() ANDs in the u.u_cmask,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 * but symlinks really need to be 777 access)
944 */
945 ip->i_mode |= 0777;
946
947 /*
948 * write symbolic link target path name
949 */
950 xtInitRoot(tid, ip);
951
952 /*
953 * write source path name inline in on-disk inode (fast symbolic link)
954 */
955
956 if (ssize <= IDATASIZE) {
Dmitry Monakhovc7f2e1f2010-04-16 08:05:50 -0500957 ip->i_op = &jfs_fast_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 i_fastsymlink = JFS_IP(ip)->i_inline;
960 memcpy(i_fastsymlink, name, ssize);
961 ip->i_size = ssize - 1;
962
963 /*
964 * if symlink is > 128 bytes, we don't have the space to
965 * store inline extended attributes
966 */
967 if (ssize > sizeof (JFS_IP(ip)->i_inline))
968 JFS_IP(ip)->mode2 &= ~INLINEEA;
969
970 jfs_info("jfs_symlink: fast symlink added ssize:%d name:%s ",
971 ssize, name);
972 }
973 /*
974 * write source path name in a single extent
975 */
976 else {
977 jfs_info("jfs_symlink: allocate extent ip:0x%p", ip);
978
Dmitry Monakhovc7f2e1f2010-04-16 08:05:50 -0500979 ip->i_op = &jfs_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 ip->i_mapping->a_ops = &jfs_aops;
981
982 /*
Dave Kleikamp63f83c92006-10-02 09:55:27 -0500983 * even though the data of symlink object (source
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 * path name) is treated as non-journaled user data,
985 * it is read/written thru buffer cache for performance.
986 */
987 sb = ip->i_sb;
988 bmask = JFS_SBI(sb)->bsize - 1;
989 xsize = (ssize + bmask) & ~bmask;
990 xaddr = 0;
991 xlen = xsize >> JFS_SBI(sb)->l2bsize;
992 if ((rc = xtInsert(tid, ip, 0, 0, xlen, &xaddr, 0))) {
993 txAbort(tid, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 goto out3;
995 }
996 extent = xaddr;
997 ip->i_size = ssize - 1;
998 while (ssize) {
999 /* This is kind of silly since PATH_MAX == 4K */
1000 int copy_size = min(ssize, PSIZE);
1001
1002 mp = get_metapage(ip, xaddr, PSIZE, 1);
1003
1004 if (mp == NULL) {
1005 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1006 rc = -EIO;
1007 txAbort(tid, 0);
1008 goto out3;
1009 }
1010 memcpy(mp->data, name, copy_size);
1011 flush_metapage(mp);
1012 ssize -= copy_size;
1013 name += copy_size;
1014 xaddr += JFS_SBI(sb)->nbperpage;
1015 }
1016 }
1017
1018 /*
1019 * create entry for symbolic link in parent directory
1020 */
1021 rc = dtSearch(dip, &dname, &ino, &btstack, JFS_CREATE);
1022 if (rc == 0) {
1023 ino = ip->i_ino;
1024 rc = dtInsert(tid, dip, &dname, &ino, &btstack);
1025 }
1026 if (rc) {
1027 if (xlen)
1028 xtTruncate(tid, ip, 0, COMMIT_PWMAP);
1029 txAbort(tid, 0);
1030 /* discard new inode */
1031 goto out3;
1032 }
1033
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 mark_inode_dirty(ip);
1035
Dave Kleikamp988a6492005-10-31 16:53:04 -06001036 dip->i_ctime = dip->i_mtime = CURRENT_TIME;
1037 mark_inode_dirty(dip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 /*
1039 * commit update of parent directory and link object
1040 */
1041
1042 iplist[0] = dip;
1043 iplist[1] = ip;
1044 rc = txCommit(tid, 2, &iplist[0], 0);
1045
1046 out3:
1047 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -06001048 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -05001049 mutex_unlock(&JFS_IP(dip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 if (rc) {
Dave Kleikamp4f4b4012005-09-01 09:02:43 -05001051 free_ea_wmap(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 ip->i_nlink = 0;
Dave Kleikamp1f3403f2008-12-30 22:08:37 -06001053 unlock_new_inode(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 iput(ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -06001055 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 d_instantiate(dentry, ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -06001057 unlock_new_inode(ip);
1058 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059
1060 out2:
1061 free_UCSname(&dname);
1062
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 out1:
1064 jfs_info("jfs_symlink: rc:%d", rc);
1065 return rc;
1066}
1067
1068
1069/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001070 * NAME: jfs_rename
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001072 * FUNCTION: rename a file or directory
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 */
1074static int jfs_rename(struct inode *old_dir, struct dentry *old_dentry,
1075 struct inode *new_dir, struct dentry *new_dentry)
1076{
1077 struct btstack btstack;
1078 ino_t ino;
1079 struct component_name new_dname;
1080 struct inode *new_ip;
1081 struct component_name old_dname;
1082 struct inode *old_ip;
1083 int rc;
1084 tid_t tid;
1085 struct tlock *tlck;
1086 struct dt_lock *dtlck;
1087 struct lv *lv;
1088 int ipcount;
1089 struct inode *iplist[4];
1090 struct tblock *tblk;
1091 s64 new_size = 0;
1092 int commit_flag;
1093
1094
1095 jfs_info("jfs_rename: %s %s", old_dentry->d_name.name,
1096 new_dentry->d_name.name);
1097
Christoph Hellwig871a2932010-03-03 09:05:07 -05001098 dquot_initialize(old_dir);
1099 dquot_initialize(new_dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05001100
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 old_ip = old_dentry->d_inode;
1102 new_ip = new_dentry->d_inode;
1103
1104 if ((rc = get_UCSname(&old_dname, old_dentry)))
1105 goto out1;
1106
1107 if ((rc = get_UCSname(&new_dname, new_dentry)))
1108 goto out2;
1109
1110 /*
1111 * Make sure source inode number is what we think it is
1112 */
1113 rc = dtSearch(old_dir, &old_dname, &ino, &btstack, JFS_LOOKUP);
1114 if (rc || (ino != old_ip->i_ino)) {
1115 rc = -ENOENT;
1116 goto out3;
1117 }
1118
1119 /*
1120 * Make sure dest inode number (if any) is what we think it is
1121 */
1122 rc = dtSearch(new_dir, &new_dname, &ino, &btstack, JFS_LOOKUP);
Joe Perches09aaa742007-11-13 22:16:08 -06001123 if (!rc) {
Dave Kleikampda8a41d2007-11-13 22:25:41 -06001124 if ((!new_ip) || (ino != new_ip->i_ino)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 rc = -ESTALE;
1126 goto out3;
1127 }
1128 } else if (rc != -ENOENT)
1129 goto out3;
1130 else if (new_ip) {
1131 /* no entry exists, but one was expected */
1132 rc = -ESTALE;
1133 goto out3;
1134 }
1135
1136 if (S_ISDIR(old_ip->i_mode)) {
1137 if (new_ip) {
1138 if (!dtEmpty(new_ip)) {
1139 rc = -ENOTEMPTY;
1140 goto out3;
1141 }
1142 } else if ((new_dir != old_dir) &&
1143 (new_dir->i_nlink == JFS_LINK_MAX)) {
1144 rc = -EMLINK;
1145 goto out3;
1146 }
1147 } else if (new_ip) {
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -06001148 IWRITE_LOCK(new_ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 /* Init inode for quota operations. */
Christoph Hellwig871a2932010-03-03 09:05:07 -05001150 dquot_initialize(new_ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001151 }
1152
1153 /*
1154 * The real work starts here
1155 */
1156 tid = txBegin(new_dir->i_sb, 0);
1157
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -06001158 /*
1159 * How do we know the locking is safe from deadlocks?
1160 * The vfs does the hard part for us. Any time we are taking nested
1161 * commit_mutexes, the vfs already has i_mutex held on the parent.
1162 * Here, the vfs has already taken i_mutex on both old_dir and new_dir.
1163 */
1164 mutex_lock_nested(&JFS_IP(new_dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1165 mutex_lock_nested(&JFS_IP(old_ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166 if (old_dir != new_dir)
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -06001167 mutex_lock_nested(&JFS_IP(old_dir)->commit_mutex,
1168 COMMIT_MUTEX_SECOND_PARENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169
1170 if (new_ip) {
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -06001171 mutex_lock_nested(&JFS_IP(new_ip)->commit_mutex,
1172 COMMIT_MUTEX_VICTIM);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 /*
1174 * Change existing directory entry to new inode number
1175 */
1176 ino = new_ip->i_ino;
1177 rc = dtModify(tid, new_dir, &new_dname, &ino,
1178 old_ip->i_ino, JFS_RENAME);
1179 if (rc)
1180 goto out4;
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001181 drop_nlink(new_ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 if (S_ISDIR(new_ip->i_mode)) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001183 drop_nlink(new_ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184 if (new_ip->i_nlink) {
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -05001185 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 if (old_dir != new_dir)
Ingo Molnar1de87442006-01-24 15:22:50 -06001187 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -05001188 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1189 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 if (!S_ISDIR(old_ip->i_mode) && new_ip)
1191 IWRITE_UNLOCK(new_ip);
1192 jfs_error(new_ip->i_sb,
1193 "jfs_rename: new_ip->i_nlink != 0");
1194 return -EIO;
1195 }
1196 tblk = tid_to_tblock(tid);
1197 tblk->xflag |= COMMIT_DELETE;
1198 tblk->u.ip = new_ip;
1199 } else if (new_ip->i_nlink == 0) {
1200 assert(!test_cflag(COMMIT_Nolink, new_ip));
1201 /* free block resources */
1202 if ((new_size = commitZeroLink(tid, new_ip)) < 0) {
1203 txAbort(tid, 1); /* Marks FS Dirty */
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001204 rc = new_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 goto out4;
1206 }
1207 tblk = tid_to_tblock(tid);
1208 tblk->xflag |= COMMIT_DELETE;
1209 tblk->u.ip = new_ip;
1210 } else {
1211 new_ip->i_ctime = CURRENT_TIME;
1212 mark_inode_dirty(new_ip);
1213 }
1214 } else {
1215 /*
1216 * Add new directory entry
1217 */
1218 rc = dtSearch(new_dir, &new_dname, &ino, &btstack,
1219 JFS_CREATE);
1220 if (rc) {
1221 jfs_err("jfs_rename didn't expect dtSearch to fail "
1222 "w/rc = %d", rc);
1223 goto out4;
1224 }
1225
1226 ino = old_ip->i_ino;
1227 rc = dtInsert(tid, new_dir, &new_dname, &ino, &btstack);
1228 if (rc) {
1229 if (rc == -EIO)
1230 jfs_err("jfs_rename: dtInsert returned -EIO");
1231 goto out4;
1232 }
1233 if (S_ISDIR(old_ip->i_mode))
Dave Hansend8c76e62006-09-30 23:29:04 -07001234 inc_nlink(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235 }
1236 /*
1237 * Remove old directory entry
1238 */
1239
1240 ino = old_ip->i_ino;
1241 rc = dtDelete(tid, old_dir, &old_dname, &ino, JFS_REMOVE);
1242 if (rc) {
1243 jfs_err("jfs_rename did not expect dtDelete to return rc = %d",
1244 rc);
1245 txAbort(tid, 1); /* Marks Filesystem dirty */
1246 goto out4;
1247 }
1248 if (S_ISDIR(old_ip->i_mode)) {
Dave Hansen9a53c3a2006-09-30 23:29:03 -07001249 drop_nlink(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 if (old_dir != new_dir) {
1251 /*
1252 * Change inode number of parent for moved directory
1253 */
1254
1255 JFS_IP(old_ip)->i_dtroot.header.idotdot =
1256 cpu_to_le32(new_dir->i_ino);
1257
1258 /* Linelock header of dtree */
1259 tlck = txLock(tid, old_ip,
1260 (struct metapage *) &JFS_IP(old_ip)->bxflag,
1261 tlckDTREE | tlckBTROOT | tlckRELINK);
1262 dtlck = (struct dt_lock *) & tlck->lock;
1263 ASSERT(dtlck->index == 0);
1264 lv = & dtlck->lv[0];
1265 lv->offset = 0;
1266 lv->length = 1;
1267 dtlck->index++;
1268 }
1269 }
1270
1271 /*
1272 * Update ctime on changed/moved inodes & mark dirty
1273 */
1274 old_ip->i_ctime = CURRENT_TIME;
1275 mark_inode_dirty(old_ip);
1276
1277 new_dir->i_ctime = new_dir->i_mtime = current_fs_time(new_dir->i_sb);
1278 mark_inode_dirty(new_dir);
1279
1280 /* Build list of inodes modified by this transaction */
1281 ipcount = 0;
1282 iplist[ipcount++] = old_ip;
1283 if (new_ip)
1284 iplist[ipcount++] = new_ip;
1285 iplist[ipcount++] = old_dir;
1286
1287 if (old_dir != new_dir) {
1288 iplist[ipcount++] = new_dir;
1289 old_dir->i_ctime = old_dir->i_mtime = CURRENT_TIME;
1290 mark_inode_dirty(old_dir);
1291 }
1292
1293 /*
1294 * Incomplete truncate of file data can
1295 * result in timing problems unless we synchronously commit the
1296 * transaction.
1297 */
1298 if (new_size)
1299 commit_flag = COMMIT_SYNC;
1300 else
1301 commit_flag = 0;
1302
1303 rc = txCommit(tid, ipcount, iplist, commit_flag);
1304
1305 out4:
1306 txEnd(tid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 if (new_ip)
Ingo Molnar1de87442006-01-24 15:22:50 -06001308 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
Evgeniy Dushistov48ce8b02006-06-05 08:21:03 -05001309 if (old_dir != new_dir)
1310 mutex_unlock(&JFS_IP(old_dir)->commit_mutex);
1311 mutex_unlock(&JFS_IP(old_ip)->commit_mutex);
1312 mutex_unlock(&JFS_IP(new_dir)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001313
1314 while (new_size && (rc == 0)) {
1315 tid = txBegin(new_ip->i_sb, 0);
Ingo Molnar1de87442006-01-24 15:22:50 -06001316 mutex_lock(&JFS_IP(new_ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317 new_size = xtTruncate_pmap(tid, new_ip, new_size);
1318 if (new_size < 0) {
1319 txAbort(tid, 1);
Dave Kleikamp63f83c92006-10-02 09:55:27 -05001320 rc = new_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321 } else
1322 rc = txCommit(tid, 1, &new_ip, COMMIT_SYNC);
1323 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -06001324 mutex_unlock(&JFS_IP(new_ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325 }
1326 if (new_ip && (new_ip->i_nlink == 0))
1327 set_cflag(COMMIT_Nolink, new_ip);
1328 out3:
1329 free_UCSname(&new_dname);
1330 out2:
1331 free_UCSname(&old_dname);
1332 out1:
1333 if (new_ip && !S_ISDIR(new_ip->i_mode))
1334 IWRITE_UNLOCK(new_ip);
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 }
1345
1346 jfs_info("jfs_rename: returning %d", rc);
1347 return rc;
1348}
1349
1350
1351/*
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001352 * NAME: jfs_mknod
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 *
Dave Kleikampf720e3b2007-06-06 15:28:35 -05001354 * FUNCTION: Create a special file (device)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 */
1356static int jfs_mknod(struct inode *dir, struct dentry *dentry,
1357 int mode, dev_t rdev)
1358{
1359 struct jfs_inode_info *jfs_ip;
1360 struct btstack btstack;
1361 struct component_name dname;
1362 ino_t ino;
1363 struct inode *ip;
1364 struct inode *iplist[2];
1365 int rc;
1366 tid_t tid;
1367 struct tblock *tblk;
1368
1369 if (!new_valid_dev(rdev))
1370 return -EINVAL;
1371
1372 jfs_info("jfs_mknod: %s", dentry->d_name.name);
1373
Christoph Hellwig871a2932010-03-03 09:05:07 -05001374 dquot_initialize(dir);
Christoph Hellwig907f4552010-03-03 09:05:06 -05001375
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376 if ((rc = get_UCSname(&dname, dentry)))
1377 goto out;
1378
1379 ip = ialloc(dir, mode);
Akinobu Mita087387f2006-09-14 09:22:38 -05001380 if (IS_ERR(ip)) {
1381 rc = PTR_ERR(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 goto out1;
1383 }
1384 jfs_ip = JFS_IP(ip);
1385
1386 tid = txBegin(dir->i_sb, 0);
1387
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -06001388 mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);
1389 mutex_lock_nested(&JFS_IP(ip)->commit_mutex, COMMIT_MUTEX_CHILD);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390
Dave Kleikamp4f4b4012005-09-01 09:02:43 -05001391 rc = jfs_init_acl(tid, ip, dir);
1392 if (rc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 goto out3;
1394
Eric Paris2a7dba32011-02-01 11:05:39 -05001395 rc = jfs_init_security(tid, ip, dir, &dentry->d_name);
Dave Kleikamp1d15b10f2005-09-01 09:05:39 -05001396 if (rc) {
1397 txAbort(tid, 0);
1398 goto out3;
1399 }
1400
Dave Kleikamp4f4b4012005-09-01 09:02:43 -05001401 if ((rc = dtSearch(dir, &dname, &ino, &btstack, JFS_CREATE))) {
1402 txAbort(tid, 0);
1403 goto out3;
1404 }
1405
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 tblk = tid_to_tblock(tid);
1407 tblk->xflag |= COMMIT_CREATE;
1408 tblk->ino = ip->i_ino;
1409 tblk->u.ixpxd = JFS_IP(ip)->ixpxd;
1410
1411 ino = ip->i_ino;
Dave Kleikamp4f4b4012005-09-01 09:02:43 -05001412 if ((rc = dtInsert(tid, dir, &dname, &ino, &btstack))) {
1413 txAbort(tid, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 goto out3;
Dave Kleikamp4f4b4012005-09-01 09:02:43 -05001415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416
1417 ip->i_op = &jfs_file_inode_operations;
1418 jfs_ip->dev = new_encode_dev(rdev);
1419 init_special_inode(ip, ip->i_mode, rdev);
1420
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 mark_inode_dirty(ip);
1422
1423 dir->i_ctime = dir->i_mtime = CURRENT_TIME;
1424
1425 mark_inode_dirty(dir);
1426
1427 iplist[0] = dir;
1428 iplist[1] = ip;
1429 rc = txCommit(tid, 2, iplist, 0);
1430
1431 out3:
1432 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -06001433 mutex_unlock(&JFS_IP(ip)->commit_mutex);
1434 mutex_unlock(&JFS_IP(dir)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435 if (rc) {
Dave Kleikamp4f4b4012005-09-01 09:02:43 -05001436 free_ea_wmap(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 ip->i_nlink = 0;
Dave Kleikamp1f3403f2008-12-30 22:08:37 -06001438 unlock_new_inode(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 iput(ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -06001440 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 d_instantiate(dentry, ip);
Dave Kleikamp1f3403f2008-12-30 22:08:37 -06001442 unlock_new_inode(ip);
1443 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
1445 out1:
1446 free_UCSname(&dname);
1447
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 out:
1449 jfs_info("jfs_mknod: returning %d", rc);
1450 return rc;
1451}
1452
1453static struct dentry *jfs_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
1454{
1455 struct btstack btstack;
1456 ino_t inum;
1457 struct inode *ip;
1458 struct component_name key;
1459 const char *name = dentry->d_name.name;
1460 int len = dentry->d_name.len;
1461 int rc;
1462
1463 jfs_info("jfs_lookup: name = %s", name);
1464
Linus Torvalds1da177e2005-04-16 15:20:36 -07001465 if ((name[0] == '.') && (len == 1))
1466 inum = dip->i_ino;
1467 else if (strcmp(name, "..") == 0)
1468 inum = PARENT(dip);
1469 else {
1470 if ((rc = get_UCSname(&key, dentry)))
1471 return ERR_PTR(rc);
1472 rc = dtSearch(dip, &key, &inum, &btstack, JFS_LOOKUP);
1473 free_UCSname(&key);
1474 if (rc == -ENOENT) {
1475 d_add(dentry, NULL);
Marcin Slusarz88f85a52008-05-12 16:42:43 -05001476 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 } else if (rc) {
1478 jfs_err("jfs_lookup: dtSearch returned %d", rc);
1479 return ERR_PTR(rc);
1480 }
1481 }
1482
David Howellseab1df72008-02-07 00:15:43 -08001483 ip = jfs_iget(dip->i_sb, inum);
1484 if (IS_ERR(ip)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 jfs_err("jfs_lookup: iget failed on inum %d", (uint) inum);
David Howellseab1df72008-02-07 00:15:43 -08001486 return ERR_CAST(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 }
1488
Al Viro94b77bd2010-12-18 10:59:31 -05001489 return d_splice_alias(ip, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490}
1491
Christoph Hellwigd425de72007-10-21 16:42:09 -07001492static struct inode *jfs_nfs_get_inode(struct super_block *sb,
1493 u64 ino, u32 generation)
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001494{
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001495 struct inode *inode;
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001496
1497 if (ino == 0)
1498 return ERR_PTR(-ESTALE);
David Howellseab1df72008-02-07 00:15:43 -08001499 inode = jfs_iget(sb, ino);
1500 if (IS_ERR(inode))
1501 return ERR_CAST(inode);
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001502
David Howellseab1df72008-02-07 00:15:43 -08001503 if (generation && inode->i_generation != generation) {
Christoph Hellwigd425de72007-10-21 16:42:09 -07001504 iput(inode);
1505 return ERR_PTR(-ESTALE);
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001506 }
1507
Christoph Hellwigd425de72007-10-21 16:42:09 -07001508 return inode;
1509}
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001510
Christoph Hellwigd425de72007-10-21 16:42:09 -07001511struct dentry *jfs_fh_to_dentry(struct super_block *sb, struct fid *fid,
1512 int fh_len, int fh_type)
1513{
1514 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1515 jfs_nfs_get_inode);
1516}
1517
1518struct dentry *jfs_fh_to_parent(struct super_block *sb, struct fid *fid,
1519 int fh_len, int fh_type)
1520{
1521 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1522 jfs_nfs_get_inode);
Christoph Hellwig5ca29602007-07-17 04:04:29 -07001523}
1524
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525struct dentry *jfs_get_parent(struct dentry *dentry)
1526{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 unsigned long parent_ino;
1528
1529 parent_ino =
1530 le32_to_cpu(JFS_IP(dentry->d_inode)->i_dtroot.header.idotdot);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Christoph Hellwig44003722008-08-11 15:49:04 +02001532 return d_obtain_alias(jfs_iget(dentry->d_inode->i_sb, parent_ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533}
1534
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08001535const struct inode_operations jfs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 .create = jfs_create,
1537 .lookup = jfs_lookup,
1538 .link = jfs_link,
1539 .unlink = jfs_unlink,
1540 .symlink = jfs_symlink,
1541 .mkdir = jfs_mkdir,
1542 .rmdir = jfs_rmdir,
1543 .mknod = jfs_mknod,
1544 .rename = jfs_rename,
1545 .setxattr = jfs_setxattr,
1546 .getxattr = jfs_getxattr,
1547 .listxattr = jfs_listxattr,
1548 .removexattr = jfs_removexattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549 .setattr = jfs_setattr,
Christoph Hellwig759bfee2010-03-03 09:05:02 -05001550#ifdef CONFIG_JFS_POSIX_ACL
Linus Torvalds18f4c642009-08-28 12:29:03 -07001551 .check_acl = jfs_check_acl,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552#endif
1553};
1554
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001555const struct file_operations jfs_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 .read = generic_read_dir,
1557 .readdir = jfs_readdir,
1558 .fsync = jfs_fsync,
Andi Kleenbaab81f2008-01-27 16:58:51 -06001559 .unlocked_ioctl = jfs_ioctl,
Andi Kleenef1fc2f2008-01-27 17:02:02 -06001560#ifdef CONFIG_COMPAT
1561 .compat_ioctl = jfs_compat_ioctl,
1562#endif
Christoph Hellwig3222a3e2008-09-03 21:53:01 +02001563 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564};
1565
Nick Pigginb1e6a012011-01-07 17:49:28 +11001566static int jfs_ci_hash(const struct dentry *dir, const struct inode *inode,
1567 struct qstr *this)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568{
1569 unsigned long hash;
1570 int i;
1571
1572 hash = init_name_hash();
1573 for (i=0; i < this->len; i++)
1574 hash = partial_name_hash(tolower(this->name[i]), hash);
1575 this->hash = end_name_hash(hash);
1576
1577 return 0;
1578}
1579
Nick Piggin621e1552011-01-07 17:49:27 +11001580static int jfs_ci_compare(const struct dentry *parent,
1581 const struct inode *pinode,
1582 const struct dentry *dentry, const struct inode *inode,
1583 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001584{
1585 int i, result = 1;
1586
Nick Piggin621e1552011-01-07 17:49:27 +11001587 if (len != name->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 goto out;
Nick Piggin621e1552011-01-07 17:49:27 +11001589 for (i=0; i < len; i++) {
1590 if (tolower(str[i]) != tolower(name->name[i]))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001591 goto out;
1592 }
1593 result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594out:
1595 return result;
1596}
1597
Nick Piggin2bc334d2011-01-07 17:49:25 +11001598static int jfs_ci_revalidate(struct dentry *dentry, struct nameidata *nd)
1599{
Al Viro8ce84ee2011-03-10 03:45:28 -05001600 if (nd && nd->flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +11001601 return -ECHILD;
Nick Piggin2bc334d2011-01-07 17:49:25 +11001602 /*
1603 * This is not negative dentry. Always valid.
1604 *
1605 * Note, rename() to existing directory entry will have ->d_inode,
1606 * and will use existing name which isn't specified name by user.
1607 *
1608 * We may be able to drop this positive dentry here. But dropping
1609 * positive dentry isn't good idea. So it's unsupported like
1610 * rename("filename", "FILENAME") for now.
1611 */
1612 if (dentry->d_inode)
1613 return 1;
1614
1615 /*
1616 * This may be nfsd (or something), anyway, we can't see the
1617 * intent of this. So, since this can be for creation, drop it.
1618 */
1619 if (!nd)
1620 return 0;
1621
1622 /*
1623 * Drop the negative dentry, in order to make sure to use the
1624 * case sensitive name which is specified by user if this is
1625 * for creation.
1626 */
1627 if (!(nd->flags & (LOOKUP_CONTINUE | LOOKUP_PARENT))) {
1628 if (nd->flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET))
1629 return 0;
1630 }
1631 return 1;
1632}
1633
Al Viroad28b4e2009-02-20 06:00:49 +00001634const struct dentry_operations jfs_ci_dentry_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -07001635{
1636 .d_hash = jfs_ci_hash,
1637 .d_compare = jfs_ci_compare,
Nick Piggin2bc334d2011-01-07 17:49:25 +11001638 .d_revalidate = jfs_ci_revalidate,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639};