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[GFS2] Update init_dinode() to reduce stack usage
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / ops_inode.c
CommitLineData
b3b94faa
DT		 1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License v.2.
8 */
9
10#include <linux/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/namei.h>
16#include <linux/utsname.h>
17#include <linux/mm.h>
18#include <linux/xattr.h>
19#include <linux/posix_acl.h>
20#include <asm/semaphore.h>
21#include <asm/uaccess.h>
22
23#include "gfs2.h"
24#include "acl.h"
25#include "bmap.h"
26#include "dir.h"
27#include "eaops.h"
28#include "eattr.h"
29#include "glock.h"
30#include "inode.h"
31#include "meta_io.h"
32#include "ops_dentry.h"
33#include "ops_inode.h"
34#include "page.h"
35#include "quota.h"
36#include "rgrp.h"
37#include "trans.h"
38#include "unlinked.h"
39
40/**
41 * gfs2_create - Create a file
42 * @dir: The directory in which to create the file
43 * @dentry: The dentry of the new file
44 * @mode: The mode of the new file
45 *
46 * Returns: errno
47 */
48
49static int gfs2_create(struct inode *dir, struct dentry *dentry,
50 int mode, struct nameidata *nd)
51{
52 struct gfs2_inode *dip = get_v2ip(dir), *ip;
53 struct gfs2_sbd *sdp = dip->i_sbd;
54 struct gfs2_holder ghs[2];
55 struct inode *inode;
56 int new = 1;
57 int error;
58
59 atomic_inc(&sdp->sd_ops_inode);
60
61 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
62
63 for (;;) {
64 error = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
65 if (!error) {
66 ip = get_gl2ip(ghs[1].gh_gl);
67 gfs2_trans_end(sdp);
68 if (dip->i_alloc.al_rgd)
69 gfs2_inplace_release(dip);
70 gfs2_quota_unlock(dip);
71 gfs2_alloc_put(dip);
72 gfs2_glock_dq_uninit_m(2, ghs);
73 break;
74 } else if (error != -EEXIST ||
75 (nd->intent.open.flags & O_EXCL)) {
76 gfs2_holder_uninit(ghs);
77 return error;
78 }
79
80 error = gfs2_lookupi(dip, &dentry->d_name, 0, &ip);
81 if (!error) {
82 new = 0;
83 gfs2_holder_uninit(ghs);
84 break;
85 } else if (error != -ENOENT) {
86 gfs2_holder_uninit(ghs);
87 return error;
88 }
89 }
90
91 inode = gfs2_ip2v(ip);
92 gfs2_inode_put(ip);
93
94 if (!inode)
95 return -ENOMEM;
96
97 d_instantiate(dentry, inode);
98 if (new)
99 mark_inode_dirty(inode);
100
101 return 0;
102}
103
104/**
105 * gfs2_lookup - Look up a filename in a directory and return its inode
106 * @dir: The directory inode
107 * @dentry: The dentry of the new inode
108 * @nd: passed from Linux VFS, ignored by us
109 *
110 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
111 *
112 * Returns: errno
113 */
114
115static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
116 struct nameidata *nd)
117{
118 struct gfs2_inode *dip = get_v2ip(dir), *ip;
119 struct gfs2_sbd *sdp = dip->i_sbd;
120 struct inode *inode = NULL;
121 int error;
122
123 atomic_inc(&sdp->sd_ops_inode);
124
125 if (!sdp->sd_args.ar_localcaching)
126 dentry->d_op = &gfs2_dops;
127
128 error = gfs2_lookupi(dip, &dentry->d_name, 0, &ip);
129 if (!error) {
130 inode = gfs2_ip2v(ip);
131 gfs2_inode_put(ip);
132 if (!inode)
133 return ERR_PTR(-ENOMEM);
134
135 } else if (error != -ENOENT)
136 return ERR_PTR(error);
137
138 if (inode)
139 return d_splice_alias(inode, dentry);
140 d_add(dentry, inode);
141
142 return NULL;
143}
144
145/**
146 * gfs2_link - Link to a file
147 * @old_dentry: The inode to link
148 * @dir: Add link to this directory
149 * @dentry: The name of the link
150 *
151 * Link the inode in "old_dentry" into the directory "dir" with the
152 * name in "dentry".
153 *
154 * Returns: errno
155 */
156
157static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
158 struct dentry *dentry)
159{
160 struct gfs2_inode *dip = get_v2ip(dir);
161 struct gfs2_sbd *sdp = dip->i_sbd;
162 struct inode *inode = old_dentry->d_inode;
163 struct gfs2_inode *ip = get_v2ip(inode);
164 struct gfs2_holder ghs[2];
165 int alloc_required;
166 int error;
167
168 atomic_inc(&sdp->sd_ops_inode);
169
170 if (S_ISDIR(ip->i_di.di_mode))
171 return -EPERM;
172
173 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
174 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
175
176 error = gfs2_glock_nq_m(2, ghs);
177 if (error)
178 goto out;
179
180 error = gfs2_repermission(dir, MAY_WRITE | MAY_EXEC, NULL);
181 if (error)
182 goto out_gunlock;
183
184 error = gfs2_dir_search(dip, &dentry->d_name, NULL, NULL);
185 switch (error) {
186 case -ENOENT:
187 break;
188 case 0:
189 error = -EEXIST;
190 default:
191 goto out_gunlock;
192 }
193
194 error = -EINVAL;
195 if (!dip->i_di.di_nlink)
196 goto out_gunlock;
197 error = -EFBIG;
198 if (dip->i_di.di_entries == (uint32_t)-1)
199 goto out_gunlock;
200 error = -EPERM;
201 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
202 goto out_gunlock;
203 error = -EINVAL;
204 if (!ip->i_di.di_nlink)
205 goto out_gunlock;
206 error = -EMLINK;
207 if (ip->i_di.di_nlink == (uint32_t)-1)
208 goto out_gunlock;
209
210 error = gfs2_diradd_alloc_required(dip, &dentry->d_name,
211 &alloc_required);
212 if (error)
213 goto out_gunlock;
214
215 if (alloc_required) {
216 struct gfs2_alloc *al = gfs2_alloc_get(dip);
217
218 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
219 if (error)
220 goto out_alloc;
221
222 error = gfs2_quota_check(dip, dip->i_di.di_uid,
223 dip->i_di.di_gid);
224 if (error)
225 goto out_gunlock_q;
226
227 al->al_requested = sdp->sd_max_dirres;
228
229 error = gfs2_inplace_reserve(dip);
230 if (error)
231 goto out_gunlock_q;
232
233 error = gfs2_trans_begin(sdp,
234 sdp->sd_max_dirres +
235 al->al_rgd->rd_ri.ri_length +
236 2 * RES_DINODE + RES_STATFS +
237 RES_QUOTA, 0);
238 if (error)
239 goto out_ipres;
240 } else {
241 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
242 if (error)
243 goto out_ipres;
244 }
245
246 error = gfs2_dir_add(dip, &dentry->d_name, &ip->i_num,
247 IF2DT(ip->i_di.di_mode));
248 if (error)
249 goto out_end_trans;
250
251 error = gfs2_change_nlink(ip, +1);
252
253 out_end_trans:
254 gfs2_trans_end(sdp);
255
256 out_ipres:
257 if (alloc_required)
258 gfs2_inplace_release(dip);
259
260 out_gunlock_q:
261 if (alloc_required)
262 gfs2_quota_unlock(dip);
263
264 out_alloc:
265 if (alloc_required)
266 gfs2_alloc_put(dip);
267
268 out_gunlock:
269 gfs2_glock_dq_m(2, ghs);
270
271 out:
272 gfs2_holder_uninit(ghs);
273 gfs2_holder_uninit(ghs + 1);
274
275 if (!error) {
276 atomic_inc(&inode->i_count);
277 d_instantiate(dentry, inode);
278 mark_inode_dirty(inode);
279 }
280
281 return error;
282}
283
284/**
285 * gfs2_unlink - Unlink a file
286 * @dir: The inode of the directory containing the file to unlink
287 * @dentry: The file itself
288 *
289 * Unlink a file. Call gfs2_unlinki()
290 *
291 * Returns: errno
292 */
293
294static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
295{
296 struct gfs2_inode *dip = get_v2ip(dir);
297 struct gfs2_sbd *sdp = dip->i_sbd;
298 struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
299 struct gfs2_unlinked *ul;
300 struct gfs2_holder ghs[2];
301 int error;
302
303 atomic_inc(&sdp->sd_ops_inode);
304
305 error = gfs2_unlinked_get(sdp, &ul);
306 if (error)
307 return error;
308
309 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
310 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
311
312 error = gfs2_glock_nq_m(2, ghs);
313 if (error)
314 goto out;
315
316 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
317 if (error)
318 goto out_gunlock;
319
320 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF +
321 RES_UNLINKED, 0);
322 if (error)
323 goto out_gunlock;
324
325 error = gfs2_unlinki(dip, &dentry->d_name, ip,ul);
326
327 gfs2_trans_end(sdp);
328
329 out_gunlock:
330 gfs2_glock_dq_m(2, ghs);
331
332 out:
333 gfs2_holder_uninit(ghs);
334 gfs2_holder_uninit(ghs + 1);
335
336 gfs2_unlinked_put(sdp, ul);
337
338 return error;
339}
340
341/**
342 * gfs2_symlink - Create a symlink
343 * @dir: The directory to create the symlink in
344 * @dentry: The dentry to put the symlink in
345 * @symname: The thing which the link points to
346 *
347 * Returns: errno
348 */
349
350static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
351 const char *symname)
352{
353 struct gfs2_inode *dip = get_v2ip(dir), *ip;
354 struct gfs2_sbd *sdp = dip->i_sbd;
355 struct gfs2_holder ghs[2];
356 struct inode *inode;
357 struct buffer_head *dibh;
358 int size;
359 int error;
360
361 atomic_inc(&sdp->sd_ops_inode);
362
363 /* Must be stuffed with a null terminator for gfs2_follow_link() */
364 size = strlen(symname);
365 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
366 return -ENAMETOOLONG;
367
368 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
369
370 error = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
371 if (error) {
372 gfs2_holder_uninit(ghs);
373 return error;
374 }
375
376 ip = get_gl2ip(ghs[1].gh_gl);
377
378 ip->i_di.di_size = size;
379
380 error = gfs2_meta_inode_buffer(ip, &dibh);
381
382 if (!gfs2_assert_withdraw(sdp, !error)) {
383 gfs2_dinode_out(&ip->i_di, dibh->b_data);
384 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
385 size);
386 brelse(dibh);
387 }
388
389 gfs2_trans_end(sdp);
390 if (dip->i_alloc.al_rgd)
391 gfs2_inplace_release(dip);
392 gfs2_quota_unlock(dip);
393 gfs2_alloc_put(dip);
394
395 gfs2_glock_dq_uninit_m(2, ghs);
396
397 inode = gfs2_ip2v(ip);
398 gfs2_inode_put(ip);
399
400 if (!inode)
401 return -ENOMEM;
402
403 d_instantiate(dentry, inode);
404 mark_inode_dirty(inode);
405
406 return 0;
407}
408
409/**
410 * gfs2_mkdir - Make a directory
411 * @dir: The parent directory of the new one
412 * @dentry: The dentry of the new directory
413 * @mode: The mode of the new directory
414 *
415 * Returns: errno
416 */
417
418static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
419{
420 struct gfs2_inode *dip = get_v2ip(dir), *ip;
421 struct gfs2_sbd *sdp = dip->i_sbd;
422 struct gfs2_holder ghs[2];
423 struct inode *inode;
424 struct buffer_head *dibh;
425 int error;
426
427 atomic_inc(&sdp->sd_ops_inode);
428
429 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
430
431 error = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
432 if (error) {
433 gfs2_holder_uninit(ghs);
434 return error;
435 }
436
437 ip = get_gl2ip(ghs[1].gh_gl);
438
439 ip->i_di.di_nlink = 2;
440 ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
441 ip->i_di.di_flags |= GFS2_DIF_JDATA;
442 ip->i_di.di_payload_format = GFS2_FORMAT_DE;
443 ip->i_di.di_entries = 2;
444
445 error = gfs2_meta_inode_buffer(ip, &dibh);
446
447 if (!gfs2_assert_withdraw(sdp, !error)) {
448 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
449 struct gfs2_dirent *dent;
450
451 gfs2_dirent_alloc(ip, dibh, 1, &dent);
452
453 dent->de_inum = di->di_num; /* already GFS2 endian */
454 dent->de_hash = gfs2_disk_hash(".", 1);
455 dent->de_hash = cpu_to_be32(dent->de_hash);
456 dent->de_type = DT_DIR;
457 memcpy((char *) (dent + 1), ".", 1);
458 di->di_entries = cpu_to_be32(1);
459
460 gfs2_dirent_alloc(ip, dibh, 2, &dent);
461
462 gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum);
463 dent->de_hash = gfs2_disk_hash("..", 2);
464 dent->de_hash = cpu_to_be32(dent->de_hash);
465 dent->de_type = DT_DIR;
466 memcpy((char *) (dent + 1), "..", 2);
467
468 gfs2_dinode_out(&ip->i_di, (char *)di);
469
470 brelse(dibh);
471 }
472
473 error = gfs2_change_nlink(dip, +1);
474 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
475
476 gfs2_trans_end(sdp);
477 if (dip->i_alloc.al_rgd)
478 gfs2_inplace_release(dip);
479 gfs2_quota_unlock(dip);
480 gfs2_alloc_put(dip);
481
482 gfs2_glock_dq_uninit_m(2, ghs);
483
484 inode = gfs2_ip2v(ip);
485 gfs2_inode_put(ip);
486
487 if (!inode)
488 return -ENOMEM;
489
490 d_instantiate(dentry, inode);
491 mark_inode_dirty(inode);
492
493 return 0;
494}
495
496/**
497 * gfs2_rmdir - Remove a directory
498 * @dir: The parent directory of the directory to be removed
499 * @dentry: The dentry of the directory to remove
500 *
501 * Remove a directory. Call gfs2_rmdiri()
502 *
503 * Returns: errno
504 */
505
506static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
507{
508 struct gfs2_inode *dip = get_v2ip(dir);
509 struct gfs2_sbd *sdp = dip->i_sbd;
510 struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
511 struct gfs2_unlinked *ul;
512 struct gfs2_holder ghs[2];
513 int error;
514
515 atomic_inc(&sdp->sd_ops_inode);
516
517 error = gfs2_unlinked_get(sdp, &ul);
518 if (error)
519 return error;
520
521 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
522 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
523
524 error = gfs2_glock_nq_m(2, ghs);
525 if (error)
526 goto out;
527
528 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
529 if (error)
530 goto out_gunlock;
531
532 if (ip->i_di.di_entries < 2) {
533 if (gfs2_consist_inode(ip))
534 gfs2_dinode_print(&ip->i_di);
535 error = -EIO;
536 goto out_gunlock;
537 }
538 if (ip->i_di.di_entries > 2) {
539 error = -ENOTEMPTY;
540 goto out_gunlock;
541 }
542
543 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF +
544 RES_UNLINKED, 0);
545 if (error)
546 goto out_gunlock;
547
548 error = gfs2_rmdiri(dip, &dentry->d_name, ip, ul);
549
550 gfs2_trans_end(sdp);
551
552 out_gunlock:
553 gfs2_glock_dq_m(2, ghs);
554
555 out:
556 gfs2_holder_uninit(ghs);
557 gfs2_holder_uninit(ghs + 1);
558
559 gfs2_unlinked_put(sdp, ul);
560
561 return error;
562}
563
564/**
565 * gfs2_mknod - Make a special file
566 * @dir: The directory in which the special file will reside
567 * @dentry: The dentry of the special file
568 * @mode: The mode of the special file
569 * @rdev: The device specification of the special file
570 *
571 */
572
573static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
574 dev_t dev)
575{
576 struct gfs2_inode *dip = get_v2ip(dir), *ip;
577 struct gfs2_sbd *sdp = dip->i_sbd;
578 struct gfs2_holder ghs[2];
579 struct inode *inode;
580 struct buffer_head *dibh;
581 uint32_t major = 0, minor = 0;
582 int error;
583
584 atomic_inc(&sdp->sd_ops_inode);
585
586 switch (mode & S_IFMT) {
587 case S_IFBLK:
588 case S_IFCHR:
589 major = MAJOR(dev);
590 minor = MINOR(dev);
591 break;
592 case S_IFIFO:
593 case S_IFSOCK:
594 break;
595 default:
596 return -EOPNOTSUPP;
597 };
598
599 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
600
601 error = gfs2_createi(ghs, &dentry->d_name, mode);
602 if (error) {
603 gfs2_holder_uninit(ghs);
604 return error;
605 }
606
607 ip = get_gl2ip(ghs[1].gh_gl);
608
609 ip->i_di.di_major = major;
610 ip->i_di.di_minor = minor;
611
612 error = gfs2_meta_inode_buffer(ip, &dibh);
613
614 if (!gfs2_assert_withdraw(sdp, !error)) {
615 gfs2_dinode_out(&ip->i_di, dibh->b_data);
616 brelse(dibh);
617 }
618
619 gfs2_trans_end(sdp);
620 if (dip->i_alloc.al_rgd)
621 gfs2_inplace_release(dip);
622 gfs2_quota_unlock(dip);
623 gfs2_alloc_put(dip);
624
625 gfs2_glock_dq_uninit_m(2, ghs);
626
627 inode = gfs2_ip2v(ip);
628 gfs2_inode_put(ip);
629
630 if (!inode)
631 return -ENOMEM;
632
633 d_instantiate(dentry, inode);
634 mark_inode_dirty(inode);
635
636 return 0;
637}
638
639/**
640 * gfs2_rename - Rename a file
641 * @odir: Parent directory of old file name
642 * @odentry: The old dentry of the file
643 * @ndir: Parent directory of new file name
644 * @ndentry: The new dentry of the file
645 *
646 * Returns: errno
647 */
648
649static int gfs2_rename(struct inode *odir, struct dentry *odentry,
650 struct inode *ndir, struct dentry *ndentry)
651{
652 struct gfs2_inode *odip = get_v2ip(odir);
653 struct gfs2_inode *ndip = get_v2ip(ndir);
654 struct gfs2_inode *ip = get_v2ip(odentry->d_inode);
655 struct gfs2_inode *nip = NULL;
656 struct gfs2_sbd *sdp = odip->i_sbd;
657 struct gfs2_unlinked *ul;
658 struct gfs2_holder ghs[4], r_gh;
659 unsigned int num_gh;
660 int dir_rename = 0;
661 int alloc_required;
662 unsigned int x;
663 int error;
664
665 atomic_inc(&sdp->sd_ops_inode);
666
667 if (ndentry->d_inode) {
668 nip = get_v2ip(ndentry->d_inode);
669 if (ip == nip)
670 return 0;
671 }
672
673 error = gfs2_unlinked_get(sdp, &ul);
674 if (error)
675 return error;
676
677 /* Make sure we aren't trying to move a dirctory into it's subdir */
678
679 if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
680 dir_rename = 1;
681
682 error = gfs2_glock_nq_init(sdp->sd_rename_gl,
683 LM_ST_EXCLUSIVE, 0,
684 &r_gh);
685 if (error)
686 goto out;
687
688 error = gfs2_ok_to_move(ip, ndip);
689 if (error)
690 goto out_gunlock_r;
691 }
692
693 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
694 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
695 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
696 num_gh = 3;
697
698 if (nip)
699 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
700
701 error = gfs2_glock_nq_m(num_gh, ghs);
702 if (error)
703 goto out_uninit;
704
705 /* Check out the old directory */
706
707 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
708 if (error)
709 goto out_gunlock;
710
711 /* Check out the new directory */
712
713 if (nip) {
714 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
715 if (error)
716 goto out_gunlock;
717
718 if (S_ISDIR(nip->i_di.di_mode)) {
719 if (nip->i_di.di_entries < 2) {
720 if (gfs2_consist_inode(nip))
721 gfs2_dinode_print(&nip->i_di);
722 error = -EIO;
723 goto out_gunlock;
724 }
725 if (nip->i_di.di_entries > 2) {
726 error = -ENOTEMPTY;
727 goto out_gunlock;
728 }
729 }
730 } else {
731 error = gfs2_repermission(ndir, MAY_WRITE | MAY_EXEC, NULL);
732 if (error)
733 goto out_gunlock;
734
735 error = gfs2_dir_search(ndip, &ndentry->d_name, NULL, NULL);
736 switch (error) {
737 case -ENOENT:
738 error = 0;
739 break;
740 case 0:
741 error = -EEXIST;
742 default:
743 goto out_gunlock;
744 };
745
746 if (odip != ndip) {
747 if (!ndip->i_di.di_nlink) {
748 error = -EINVAL;
749 goto out_gunlock;
750 }
751 if (ndip->i_di.di_entries == (uint32_t)-1) {
752 error = -EFBIG;
753 goto out_gunlock;
754 }
755 if (S_ISDIR(ip->i_di.di_mode) &&
756 ndip->i_di.di_nlink == (uint32_t)-1) {
757 error = -EMLINK;
758 goto out_gunlock;
759 }
760 }
761 }
762
763 /* Check out the dir to be renamed */
764
765 if (dir_rename) {
766 error = gfs2_repermission(odentry->d_inode, MAY_WRITE, NULL);
767 if (error)
768 goto out_gunlock;
769 }
770
771 error = gfs2_diradd_alloc_required(ndip, &ndentry->d_name,
772 &alloc_required);
773 if (error)
774 goto out_gunlock;
775
776 if (alloc_required) {
777 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
778
779 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
780 if (error)
781 goto out_alloc;
782
783 error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
784 ndip->i_di.di_gid);
785 if (error)
786 goto out_gunlock_q;
787
788 al->al_requested = sdp->sd_max_dirres;
789
790 error = gfs2_inplace_reserve(ndip);
791 if (error)
792 goto out_gunlock_q;
793
794 error = gfs2_trans_begin(sdp,
795 sdp->sd_max_dirres +
796 al->al_rgd->rd_ri.ri_length +
797 4 * RES_DINODE + 4 * RES_LEAF +
798 RES_UNLINKED + RES_STATFS +
799 RES_QUOTA, 0);
800 if (error)
801 goto out_ipreserv;
802 } else {
803 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
804 5 * RES_LEAF +
805 RES_UNLINKED, 0);
806 if (error)
807 goto out_gunlock;
808 }
809
810 /* Remove the target file, if it exists */
811
812 if (nip) {
813 if (S_ISDIR(nip->i_di.di_mode))
814 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip, ul);
815 else
816 error = gfs2_unlinki(ndip, &ndentry->d_name, nip, ul);
817 if (error)
818 goto out_end_trans;
819 }
820
821 if (dir_rename) {
822 struct qstr name;
823 name.len = 2;
824 name.name = "..";
825
826 error = gfs2_change_nlink(ndip, +1);
827 if (error)
828 goto out_end_trans;
829 error = gfs2_change_nlink(odip, -1);
830 if (error)
831 goto out_end_trans;
832
833 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
834 if (error)
835 goto out_end_trans;
836 } else {
837 struct buffer_head *dibh;
838 error = gfs2_meta_inode_buffer(ip, &dibh);
839 if (error)
840 goto out_end_trans;
841 ip->i_di.di_ctime = get_seconds();
842 gfs2_trans_add_bh(ip->i_gl, dibh);
843 gfs2_dinode_out(&ip->i_di, dibh->b_data);
844 brelse(dibh);
845 }
846
847 error = gfs2_dir_del(odip, &odentry->d_name);
848 if (error)
849 goto out_end_trans;
850
851 error = gfs2_dir_add(ndip, &ndentry->d_name, &ip->i_num,
852 IF2DT(ip->i_di.di_mode));
853 if (error)
854 goto out_end_trans;
855
856 out_end_trans:
857 gfs2_trans_end(sdp);
858
859 out_ipreserv:
860 if (alloc_required)
861 gfs2_inplace_release(ndip);
862
863 out_gunlock_q:
864 if (alloc_required)
865 gfs2_quota_unlock(ndip);
866
867 out_alloc:
868 if (alloc_required)
869 gfs2_alloc_put(ndip);
870
871 out_gunlock:
872 gfs2_glock_dq_m(num_gh, ghs);
873
874 out_uninit:
875 for (x = 0; x < num_gh; x++)
876 gfs2_holder_uninit(ghs + x);
877
878 out_gunlock_r:
879 if (dir_rename)
880 gfs2_glock_dq_uninit(&r_gh);
881
882 out:
883 gfs2_unlinked_put(sdp, ul);
884
885 return error;
886}
887
888/**
889 * gfs2_readlink - Read the value of a symlink
890 * @dentry: the symlink
891 * @buf: the buffer to read the symlink data into
892 * @size: the size of the buffer
893 *
894 * Returns: errno
895 */
896
897static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
898 int user_size)
899{
900 struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
901 char array[GFS2_FAST_NAME_SIZE], *buf = array;
902 unsigned int len = GFS2_FAST_NAME_SIZE;
903 int error;
904
905 atomic_inc(&ip->i_sbd->sd_ops_inode);
906
907 error = gfs2_readlinki(ip, &buf, &len);
908 if (error)
909 return error;
910
911 if (user_size > len - 1)
912 user_size = len - 1;
913
914 if (copy_to_user(user_buf, buf, user_size))
915 error = -EFAULT;
916 else
917 error = user_size;
918
919 if (buf != array)
920 kfree(buf);
921
922 return error;
923}
924
925/**
926 * gfs2_follow_link - Follow a symbolic link
927 * @dentry: The dentry of the link
928 * @nd: Data that we pass to vfs_follow_link()
929 *
930 * This can handle symlinks of any size. It is optimised for symlinks
931 * under GFS2_FAST_NAME_SIZE.
932 *
933 * Returns: 0 on success or error code
934 */
935
936static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
937{
938 struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
939 char array[GFS2_FAST_NAME_SIZE], *buf = array;
940 unsigned int len = GFS2_FAST_NAME_SIZE;
941 int error;
942
943 atomic_inc(&ip->i_sbd->sd_ops_inode);
944
945 error = gfs2_readlinki(ip, &buf, &len);
946 if (!error) {
947 error = vfs_follow_link(nd, buf);
948 if (buf != array)
949 kfree(buf);
950 }
951
952 return ERR_PTR(error);
953}
954
955/**
956 * gfs2_permission -
957 * @inode:
958 * @mask:
959 * @nd: passed from Linux VFS, ignored by us
960 *
961 * Returns: errno
962 */
963
964static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
965{
966 struct gfs2_inode *ip = get_v2ip(inode);
967 struct gfs2_holder i_gh;
968 int error;
969
970 atomic_inc(&ip->i_sbd->sd_ops_inode);
971
972 if (ip->i_vn == ip->i_gl->gl_vn)
973 return generic_permission(inode, mask, gfs2_check_acl);
974
975 error = gfs2_glock_nq_init(ip->i_gl,
976 LM_ST_SHARED, LM_FLAG_ANY,
977 &i_gh);
978 if (!error) {
979 error = generic_permission(inode, mask, gfs2_check_acl_locked);
980 gfs2_glock_dq_uninit(&i_gh);
981 }
982
983 return error;
984}
985
986static int setattr_size(struct inode *inode, struct iattr *attr)
987{
988 struct gfs2_inode *ip = get_v2ip(inode);
989 int error;
990
991 if (attr->ia_size != ip->i_di.di_size) {
992 error = vmtruncate(inode, attr->ia_size);
993 if (error)
994 return error;
995 }
996
997 error = gfs2_truncatei(ip, attr->ia_size, gfs2_truncator_page);
998 if (error)
999 return error;
1000
1001 return error;
1002}
1003
1004static int setattr_chown(struct inode *inode, struct iattr *attr)
1005{
1006 struct gfs2_inode *ip = get_v2ip(inode);
1007 struct gfs2_sbd *sdp = ip->i_sbd;
1008 struct buffer_head *dibh;
1009 uint32_t ouid, ogid, nuid, ngid;
1010 int error;
1011
1012 ouid = ip->i_di.di_uid;
1013 ogid = ip->i_di.di_gid;
1014 nuid = attr->ia_uid;
1015 ngid = attr->ia_gid;
1016
1017 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1018 ouid = nuid = NO_QUOTA_CHANGE;
1019 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1020 ogid = ngid = NO_QUOTA_CHANGE;
1021
1022 gfs2_alloc_get(ip);
1023
1024 error = gfs2_quota_lock(ip, nuid, ngid);
1025 if (error)
1026 goto out_alloc;
1027
1028 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1029 error = gfs2_quota_check(ip, nuid, ngid);
1030 if (error)
1031 goto out_gunlock_q;
1032 }
1033
1034 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1035 if (error)
1036 goto out_gunlock_q;
1037
1038 error = gfs2_meta_inode_buffer(ip, &dibh);
1039 if (error)
1040 goto out_end_trans;
1041
1042 error = inode_setattr(inode, attr);
1043 gfs2_assert_warn(sdp, !error);
1044 gfs2_inode_attr_out(ip);
1045
1046 gfs2_trans_add_bh(ip->i_gl, dibh);
1047 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1048 brelse(dibh);
1049
1050 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1051 gfs2_quota_change(ip, -ip->i_di.di_blocks,
1052 ouid, ogid);
1053 gfs2_quota_change(ip, ip->i_di.di_blocks,
1054 nuid, ngid);
1055 }
1056
1057 out_end_trans:
1058 gfs2_trans_end(sdp);
1059
1060 out_gunlock_q:
1061 gfs2_quota_unlock(ip);
1062
1063 out_alloc:
1064 gfs2_alloc_put(ip);
1065
1066 return error;
1067}
1068
1069/**
1070 * gfs2_setattr - Change attributes on an inode
1071 * @dentry: The dentry which is changing
1072 * @attr: The structure describing the change
1073 *
1074 * The VFS layer wants to change one or more of an inodes attributes. Write
1075 * that change out to disk.
1076 *
1077 * Returns: errno
1078 */
1079
1080static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1081{
1082 struct inode *inode = dentry->d_inode;
1083 struct gfs2_inode *ip = get_v2ip(inode);
1084 struct gfs2_holder i_gh;
1085 int error;
1086
1087 atomic_inc(&ip->i_sbd->sd_ops_inode);
1088
1089 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1090 if (error)
1091 return error;
1092
1093 error = -EPERM;
1094 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1095 goto out;
1096
1097 error = inode_change_ok(inode, attr);
1098 if (error)
1099 goto out;
1100
1101 if (attr->ia_valid & ATTR_SIZE)
1102 error = setattr_size(inode, attr);
1103 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1104 error = setattr_chown(inode, attr);
1105 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1106 error = gfs2_acl_chmod(ip, attr);
1107 else
1108 error = gfs2_setattr_simple(ip, attr);
1109
1110 out:
1111 gfs2_glock_dq_uninit(&i_gh);
1112
1113 if (!error)
1114 mark_inode_dirty(inode);
1115
1116 return error;
1117}
1118
1119/**
1120 * gfs2_getattr - Read out an inode's attributes
1121 * @mnt: ?
1122 * @dentry: The dentry to stat
1123 * @stat: The inode's stats
1124 *
1125 * Returns: errno
1126 */
1127
1128static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1129 struct kstat *stat)
1130{
1131 struct inode *inode = dentry->d_inode;
1132 struct gfs2_inode *ip = get_v2ip(inode);
1133 struct gfs2_holder gh;
1134 int error;
1135
1136 atomic_inc(&ip->i_sbd->sd_ops_inode);
1137
1138 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1139 if (!error) {
1140 generic_fillattr(inode, stat);
1141 gfs2_glock_dq_uninit(&gh);
1142 }
1143
1144 return error;
1145}
1146
1147static int gfs2_setxattr(struct dentry *dentry, const char *name,
1148 const void *data, size_t size, int flags)
1149{
1150 struct gfs2_inode *ip = get_v2ip(dentry->d_inode);
1151 struct gfs2_ea_request er;
1152
1153 atomic_inc(&ip->i_sbd->sd_ops_inode);
1154
1155 memset(&er, 0, sizeof(struct gfs2_ea_request));
1156 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1157 if (er.er_type == GFS2_EATYPE_UNUSED)
1158 return -EOPNOTSUPP;
1159 er.er_data = (char *)data;
1160 er.er_name_len = strlen(er.er_name);
1161 er.er_data_len = size;
1162 er.er_flags = flags;
1163
1164 gfs2_assert_warn(ip->i_sbd, !(er.er_flags & GFS2_ERF_MODE));
1165
1166 return gfs2_ea_set(ip, &er);
1167}
1168
1169static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1170 void *data, size_t size)
1171{
1172 struct gfs2_ea_request er;
1173
1174 atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
1175
1176 memset(&er, 0, sizeof(struct gfs2_ea_request));
1177 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1178 if (er.er_type == GFS2_EATYPE_UNUSED)
1179 return -EOPNOTSUPP;
1180 er.er_data = data;
1181 er.er_name_len = strlen(er.er_name);
1182 er.er_data_len = size;
1183
1184 return gfs2_ea_get(get_v2ip(dentry->d_inode), &er);
1185}
1186
1187static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1188{
1189 struct gfs2_ea_request er;
1190
1191 atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
1192
1193 memset(&er, 0, sizeof(struct gfs2_ea_request));
1194 er.er_data = (size) ? buffer : NULL;
1195 er.er_data_len = size;
1196
1197 return gfs2_ea_list(get_v2ip(dentry->d_inode), &er);
1198}
1199
1200static int gfs2_removexattr(struct dentry *dentry, const char *name)
1201{
1202 struct gfs2_ea_request er;
1203
1204 atomic_inc(&get_v2sdp(dentry->d_inode->i_sb)->sd_ops_inode);
1205
1206 memset(&er, 0, sizeof(struct gfs2_ea_request));
1207 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1208 if (er.er_type == GFS2_EATYPE_UNUSED)
1209 return -EOPNOTSUPP;
1210 er.er_name_len = strlen(er.er_name);
1211
1212 return gfs2_ea_remove(get_v2ip(dentry->d_inode), &er);
1213}
1214
1215struct inode_operations gfs2_file_iops = {
1216 .permission = gfs2_permission,
1217 .setattr = gfs2_setattr,
1218 .getattr = gfs2_getattr,
1219 .setxattr = gfs2_setxattr,
1220 .getxattr = gfs2_getxattr,
1221 .listxattr = gfs2_listxattr,
1222 .removexattr = gfs2_removexattr,
1223};
1224
1225struct inode_operations gfs2_dev_iops = {
1226 .permission = gfs2_permission,
1227 .setattr = gfs2_setattr,
1228 .getattr = gfs2_getattr,
1229 .setxattr = gfs2_setxattr,
1230 .getxattr = gfs2_getxattr,
1231 .listxattr = gfs2_listxattr,
1232 .removexattr = gfs2_removexattr,
1233};
1234
1235struct inode_operations gfs2_dir_iops = {
1236 .create = gfs2_create,
1237 .lookup = gfs2_lookup,
1238 .link = gfs2_link,
1239 .unlink = gfs2_unlink,
1240 .symlink = gfs2_symlink,
1241 .mkdir = gfs2_mkdir,
1242 .rmdir = gfs2_rmdir,
1243 .mknod = gfs2_mknod,
1244 .rename = gfs2_rename,
1245 .permission = gfs2_permission,
1246 .setattr = gfs2_setattr,
1247 .getattr = gfs2_getattr,
1248 .setxattr = gfs2_setxattr,
1249 .getxattr = gfs2_getxattr,
1250 .listxattr = gfs2_listxattr,
1251 .removexattr = gfs2_removexattr,
1252};
1253
1254struct inode_operations gfs2_symlink_iops = {
1255 .readlink = gfs2_readlink,
1256 .follow_link = gfs2_follow_link,
1257 .permission = gfs2_permission,
1258 .setattr = gfs2_setattr,
1259 .getattr = gfs2_getattr,
1260 .setxattr = gfs2_setxattr,
1261 .getxattr = gfs2_getxattr,
1262 .listxattr = gfs2_listxattr,
1263 .removexattr = gfs2_removexattr,
1264};
1265
kernel source for telekom puls (alcatel/mediatek)