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[GFS2] Add generation number
[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.
3a8a9a10 3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
b3b94faa
DT		 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>
5c676f6d 20#include <linux/gfs2_ondisk.h>
71b86f56 21#include <linux/crc32.h>
b3b94faa
DT		 22#include <asm/uaccess.h>
23
24#include "gfs2.h"
5c676f6d
SW		 25#include "lm_interface.h"
26#include "incore.h"
b3b94faa
DT		 27#include "acl.h"
28#include "bmap.h"
29#include "dir.h"
30#include "eaops.h"
31#include "eattr.h"
32#include "glock.h"
33#include "inode.h"
34#include "meta_io.h"
35#include "ops_dentry.h"
36#include "ops_inode.h"
37#include "page.h"
38#include "quota.h"
39#include "rgrp.h"
40#include "trans.h"
5c676f6d 41#include "util.h"
b3b94faa
DT		 42
43/**
44 * gfs2_create - Create a file
45 * @dir: The directory in which to create the file
46 * @dentry: The dentry of the new file
47 * @mode: The mode of the new file
48 *
49 * Returns: errno
50 */
51
52static int gfs2_create(struct inode *dir, struct dentry *dentry,
53 int mode, struct nameidata *nd)
54{
feaa7bba
SW		 55 struct gfs2_inode *dip = GFS2_I(dir);
56 struct gfs2_sbd *sdp = GFS2_SB(dir);
b3b94faa
DT		 57 struct gfs2_holder ghs[2];
58 struct inode *inode;
b3b94faa 59
b3b94faa
DT		 60 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
61
62 for (;;) {
7359a19c
SW		 63 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
64 if (!IS_ERR(inode)) {
b3b94faa
DT		 65 gfs2_trans_end(sdp);
66 if (dip->i_alloc.al_rgd)
67 gfs2_inplace_release(dip);
68 gfs2_quota_unlock(dip);
69 gfs2_alloc_put(dip);
70 gfs2_glock_dq_uninit_m(2, ghs);
3a8476dd 71 mark_inode_dirty(inode);
b3b94faa 72 break;
7359a19c 73 } else if (PTR_ERR(inode) != -EEXIST ||
b3b94faa
DT		 74 (nd->intent.open.flags & O_EXCL)) {
75 gfs2_holder_uninit(ghs);
7359a19c 76 return PTR_ERR(inode);
b3b94faa
DT		 77 }
78
c752666c
SW		 79 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
80 if (inode) {
81 if (!IS_ERR(inode)) {
c752666c
SW		 82 gfs2_holder_uninit(ghs);
83 break;
84 } else {
85 gfs2_holder_uninit(ghs);
86 return PTR_ERR(inode);
87 }
b3b94faa
DT		 88 }
89 }
90
b3b94faa 91 d_instantiate(dentry, inode);
b3b94faa
DT		 92
93 return 0;
94}
95
96/**
97 * gfs2_lookup - Look up a filename in a directory and return its inode
98 * @dir: The directory inode
99 * @dentry: The dentry of the new inode
100 * @nd: passed from Linux VFS, ignored by us
101 *
102 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
103 *
104 * Returns: errno
105 */
106
107static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
108 struct nameidata *nd)
109{
b3b94faa 110 struct inode *inode = NULL;
b3b94faa 111
c752666c 112 dentry->d_op = &gfs2_dops;
b3b94faa 113
c752666c
SW		 114 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
115 if (inode && IS_ERR(inode))
116 return ERR_PTR(PTR_ERR(inode));
b3b94faa
DT		 117
118 if (inode)
119 return d_splice_alias(inode, dentry);
120 d_add(dentry, inode);
121
122 return NULL;
123}
124
125/**
126 * gfs2_link - Link to a file
127 * @old_dentry: The inode to link
128 * @dir: Add link to this directory
129 * @dentry: The name of the link
130 *
131 * Link the inode in "old_dentry" into the directory "dir" with the
132 * name in "dentry".
133 *
134 * Returns: errno
135 */
136
137static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
138 struct dentry *dentry)
139{
feaa7bba
SW		 140 struct gfs2_inode *dip = GFS2_I(dir);
141 struct gfs2_sbd *sdp = GFS2_SB(dir);
b3b94faa 142 struct inode *inode = old_dentry->d_inode;
feaa7bba 143 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa
DT		 144 struct gfs2_holder ghs[2];
145 int alloc_required;
146 int error;
147
b3b94faa
DT		 148 if (S_ISDIR(ip->i_di.di_mode))
149 return -EPERM;
150
151 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
152 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
153
154 error = gfs2_glock_nq_m(2, ghs);
155 if (error)
156 goto out;
157
faf450ef 158 error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
b3b94faa
DT		 159 if (error)
160 goto out_gunlock;
161
c752666c 162 error = gfs2_dir_search(dir, &dentry->d_name, NULL, NULL);
b3b94faa
DT		 163 switch (error) {
164 case -ENOENT:
165 break;
166 case 0:
167 error = -EEXIST;
168 default:
169 goto out_gunlock;
170 }
171
172 error = -EINVAL;
173 if (!dip->i_di.di_nlink)
174 goto out_gunlock;
175 error = -EFBIG;
176 if (dip->i_di.di_entries == (uint32_t)-1)
177 goto out_gunlock;
178 error = -EPERM;
179 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
180 goto out_gunlock;
181 error = -EINVAL;
182 if (!ip->i_di.di_nlink)
183 goto out_gunlock;
184 error = -EMLINK;
185 if (ip->i_di.di_nlink == (uint32_t)-1)
186 goto out_gunlock;
187
c752666c
SW		 188 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
189 if (error < 0)
b3b94faa 190 goto out_gunlock;
c752666c 191 error = 0;
b3b94faa
DT		 192
193 if (alloc_required) {
194 struct gfs2_alloc *al = gfs2_alloc_get(dip);
195
196 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
197 if (error)
198 goto out_alloc;
199
200 error = gfs2_quota_check(dip, dip->i_di.di_uid,
201 dip->i_di.di_gid);
202 if (error)
203 goto out_gunlock_q;
204
205 al->al_requested = sdp->sd_max_dirres;
206
207 error = gfs2_inplace_reserve(dip);
208 if (error)
209 goto out_gunlock_q;
210
1b50259b 211 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
b3b94faa
DT		 212 al->al_rgd->rd_ri.ri_length +
213 2 * RES_DINODE + RES_STATFS +
214 RES_QUOTA, 0);
215 if (error)
216 goto out_ipres;
217 } else {
218 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
219 if (error)
220 goto out_ipres;
221 }
222
c752666c 223 error = gfs2_dir_add(dir, &dentry->d_name, &ip->i_num,
b3b94faa
DT		 224 IF2DT(ip->i_di.di_mode));
225 if (error)
226 goto out_end_trans;
227
228 error = gfs2_change_nlink(ip, +1);
229
feaa7bba 230out_end_trans:
b3b94faa
DT		 231 gfs2_trans_end(sdp);
232
feaa7bba 233out_ipres:
b3b94faa
DT		 234 if (alloc_required)
235 gfs2_inplace_release(dip);
236
feaa7bba 237out_gunlock_q:
b3b94faa
DT		 238 if (alloc_required)
239 gfs2_quota_unlock(dip);
240
feaa7bba 241out_alloc:
b3b94faa
DT		 242 if (alloc_required)
243 gfs2_alloc_put(dip);
244
feaa7bba 245out_gunlock:
b3b94faa
DT		 246 gfs2_glock_dq_m(2, ghs);
247
feaa7bba 248out:
b3b94faa
DT		 249 gfs2_holder_uninit(ghs);
250 gfs2_holder_uninit(ghs + 1);
251
252 if (!error) {
29937ac6 253 atomic_inc(&inode->i_count);
b3b94faa
DT		 254 d_instantiate(dentry, inode);
255 mark_inode_dirty(inode);
256 }
257
258 return error;
259}
260
261/**
262 * gfs2_unlink - Unlink a file
263 * @dir: The inode of the directory containing the file to unlink
264 * @dentry: The file itself
265 *
266 * Unlink a file. Call gfs2_unlinki()
267 *
268 * Returns: errno
269 */
270
271static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
272{
feaa7bba
SW		 273 struct gfs2_inode *dip = GFS2_I(dir);
274 struct gfs2_sbd *sdp = GFS2_SB(dir);
275 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
b3b94faa
DT		 276 struct gfs2_holder ghs[2];
277 int error;
278
b3b94faa
DT		 279 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
280 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
281
282 error = gfs2_glock_nq_m(2, ghs);
283 if (error)
284 goto out;
285
286 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
287 if (error)
288 goto out_gunlock;
289
feaa7bba 290 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
b3b94faa
DT		 291 if (error)
292 goto out_gunlock;
293
feaa7bba
SW		 294 error = gfs2_dir_del(dip, &dentry->d_name);
295 if (error)
296 goto out_end_trans;
b3b94faa 297
feaa7bba 298 error = gfs2_change_nlink(ip, -1);
b3b94faa 299
feaa7bba
SW		 300out_end_trans:
301 gfs2_trans_end(sdp);
302out_gunlock:
b3b94faa 303 gfs2_glock_dq_m(2, ghs);
feaa7bba 304out:
b3b94faa
DT		 305 gfs2_holder_uninit(ghs);
306 gfs2_holder_uninit(ghs + 1);
b3b94faa
DT		 307 return error;
308}
309
310/**
311 * gfs2_symlink - Create a symlink
312 * @dir: The directory to create the symlink in
313 * @dentry: The dentry to put the symlink in
314 * @symname: The thing which the link points to
315 *
316 * Returns: errno
317 */
318
319static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
320 const char *symname)
321{
feaa7bba
SW		 322 struct gfs2_inode *dip = GFS2_I(dir), *ip;
323 struct gfs2_sbd *sdp = GFS2_SB(dir);
b3b94faa
DT		 324 struct gfs2_holder ghs[2];
325 struct inode *inode;
326 struct buffer_head *dibh;
327 int size;
328 int error;
329
b3b94faa
DT		 330 /* Must be stuffed with a null terminator for gfs2_follow_link() */
331 size = strlen(symname);
332 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
333 return -ENAMETOOLONG;
334
335 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
336
7359a19c
SW		 337 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
338 if (IS_ERR(inode)) {
b3b94faa 339 gfs2_holder_uninit(ghs);
7359a19c 340 return PTR_ERR(inode);
b3b94faa
DT		 341 }
342
5c676f6d 343 ip = ghs[1].gh_gl->gl_object;
b3b94faa
DT		 344
345 ip->i_di.di_size = size;
346
347 error = gfs2_meta_inode_buffer(ip, &dibh);
348
349 if (!gfs2_assert_withdraw(sdp, !error)) {
350 gfs2_dinode_out(&ip->i_di, dibh->b_data);
351 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
352 size);
353 brelse(dibh);
354 }
355
356 gfs2_trans_end(sdp);
357 if (dip->i_alloc.al_rgd)
358 gfs2_inplace_release(dip);
359 gfs2_quota_unlock(dip);
360 gfs2_alloc_put(dip);
361
362 gfs2_glock_dq_uninit_m(2, ghs);
363
b3b94faa
DT		 364 d_instantiate(dentry, inode);
365 mark_inode_dirty(inode);
366
367 return 0;
368}
369
370/**
371 * gfs2_mkdir - Make a directory
372 * @dir: The parent directory of the new one
373 * @dentry: The dentry of the new directory
374 * @mode: The mode of the new directory
375 *
376 * Returns: errno
377 */
378
379static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
380{
feaa7bba
SW		 381 struct gfs2_inode *dip = GFS2_I(dir), *ip;
382 struct gfs2_sbd *sdp = GFS2_SB(dir);
b3b94faa
DT		 383 struct gfs2_holder ghs[2];
384 struct inode *inode;
385 struct buffer_head *dibh;
386 int error;
387
b3b94faa
DT		 388 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
389
7359a19c
SW		 390 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
391 if (IS_ERR(inode)) {
b3b94faa 392 gfs2_holder_uninit(ghs);
7359a19c 393 return PTR_ERR(inode);
b3b94faa
DT		 394 }
395
5c676f6d 396 ip = ghs[1].gh_gl->gl_object;
b3b94faa
DT		 397
398 ip->i_di.di_nlink = 2;
399 ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
400 ip->i_di.di_flags |= GFS2_DIF_JDATA;
401 ip->i_di.di_payload_format = GFS2_FORMAT_DE;
402 ip->i_di.di_entries = 2;
403
404 error = gfs2_meta_inode_buffer(ip, &dibh);
405
406 if (!gfs2_assert_withdraw(sdp, !error)) {
407 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
c752666c 408 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
71b86f56 409 struct qstr str;
b3b94faa 410
71b86f56 411 gfs2_str2qstr(&str, ".");
c752666c
SW		 412 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
413 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
b3b94faa 414 dent->de_inum = di->di_num; /* already GFS2 endian */
b3b94faa 415 dent->de_type = DT_DIR;
b3b94faa
DT		 416 di->di_entries = cpu_to_be32(1);
417
71b86f56 418 gfs2_str2qstr(&str, "..");
c752666c
SW		 419 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
420 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
b3b94faa
DT		 421
422 gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum);
b3b94faa 423 dent->de_type = DT_DIR;
b3b94faa
DT		 424
425 gfs2_dinode_out(&ip->i_di, (char *)di);
426
427 brelse(dibh);
428 }
429
430 error = gfs2_change_nlink(dip, +1);
431 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
432
433 gfs2_trans_end(sdp);
434 if (dip->i_alloc.al_rgd)
435 gfs2_inplace_release(dip);
436 gfs2_quota_unlock(dip);
437 gfs2_alloc_put(dip);
438
439 gfs2_glock_dq_uninit_m(2, ghs);
440
b3b94faa
DT		 441 d_instantiate(dentry, inode);
442 mark_inode_dirty(inode);
443
444 return 0;
445}
446
447/**
448 * gfs2_rmdir - Remove a directory
449 * @dir: The parent directory of the directory to be removed
450 * @dentry: The dentry of the directory to remove
451 *
452 * Remove a directory. Call gfs2_rmdiri()
453 *
454 * Returns: errno
455 */
456
457static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
458{
feaa7bba
SW		 459 struct gfs2_inode *dip = GFS2_I(dir);
460 struct gfs2_sbd *sdp = GFS2_SB(dir);
461 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
b3b94faa
DT		 462 struct gfs2_holder ghs[2];
463 int error;
464
b3b94faa
DT		 465 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
466 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
467
468 error = gfs2_glock_nq_m(2, ghs);
469 if (error)
470 goto out;
471
472 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
473 if (error)
474 goto out_gunlock;
475
476 if (ip->i_di.di_entries < 2) {
477 if (gfs2_consist_inode(ip))
478 gfs2_dinode_print(&ip->i_di);
479 error = -EIO;
480 goto out_gunlock;
481 }
482 if (ip->i_di.di_entries > 2) {
483 error = -ENOTEMPTY;
484 goto out_gunlock;
485 }
486
feaa7bba 487 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
b3b94faa
DT		 488 if (error)
489 goto out_gunlock;
490
feaa7bba 491 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
b3b94faa
DT		 492
493 gfs2_trans_end(sdp);
494
495 out_gunlock:
496 gfs2_glock_dq_m(2, ghs);
497
498 out:
499 gfs2_holder_uninit(ghs);
500 gfs2_holder_uninit(ghs + 1);
501
b3b94faa
DT		 502 return error;
503}
504
505/**
506 * gfs2_mknod - Make a special file
507 * @dir: The directory in which the special file will reside
508 * @dentry: The dentry of the special file
509 * @mode: The mode of the special file
510 * @rdev: The device specification of the special file
511 *
512 */
513
514static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
515 dev_t dev)
516{
feaa7bba
SW		 517 struct gfs2_inode *dip = GFS2_I(dir), *ip;
518 struct gfs2_sbd *sdp = GFS2_SB(dir);
b3b94faa
DT		 519 struct gfs2_holder ghs[2];
520 struct inode *inode;
521 struct buffer_head *dibh;
522 uint32_t major = 0, minor = 0;
523 int error;
524
b3b94faa
DT		 525 switch (mode & S_IFMT) {
526 case S_IFBLK:
527 case S_IFCHR:
528 major = MAJOR(dev);
529 minor = MINOR(dev);
530 break;
531 case S_IFIFO:
532 case S_IFSOCK:
533 break;
534 default:
535 return -EOPNOTSUPP;
536 };
537
538 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
539
7359a19c
SW		 540 inode = gfs2_createi(ghs, &dentry->d_name, mode);
541 if (IS_ERR(inode)) {
b3b94faa 542 gfs2_holder_uninit(ghs);
7359a19c 543 return PTR_ERR(inode);
b3b94faa
DT		 544 }
545
5c676f6d 546 ip = ghs[1].gh_gl->gl_object;
b3b94faa
DT		 547
548 ip->i_di.di_major = major;
549 ip->i_di.di_minor = minor;
550
551 error = gfs2_meta_inode_buffer(ip, &dibh);
552
553 if (!gfs2_assert_withdraw(sdp, !error)) {
554 gfs2_dinode_out(&ip->i_di, dibh->b_data);
555 brelse(dibh);
556 }
557
558 gfs2_trans_end(sdp);
559 if (dip->i_alloc.al_rgd)
560 gfs2_inplace_release(dip);
561 gfs2_quota_unlock(dip);
562 gfs2_alloc_put(dip);
563
564 gfs2_glock_dq_uninit_m(2, ghs);
565
b3b94faa
DT		 566 d_instantiate(dentry, inode);
567 mark_inode_dirty(inode);
568
569 return 0;
570}
571
572/**
573 * gfs2_rename - Rename a file
574 * @odir: Parent directory of old file name
575 * @odentry: The old dentry of the file
576 * @ndir: Parent directory of new file name
577 * @ndentry: The new dentry of the file
578 *
579 * Returns: errno
580 */
581
582static int gfs2_rename(struct inode *odir, struct dentry *odentry,
583 struct inode *ndir, struct dentry *ndentry)
584{
feaa7bba
SW		 585 struct gfs2_inode *odip = GFS2_I(odir);
586 struct gfs2_inode *ndip = GFS2_I(ndir);
587 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
b3b94faa 588 struct gfs2_inode *nip = NULL;
feaa7bba 589 struct gfs2_sbd *sdp = GFS2_SB(odir);
b3b94faa
DT		 590 struct gfs2_holder ghs[4], r_gh;
591 unsigned int num_gh;
592 int dir_rename = 0;
593 int alloc_required;
594 unsigned int x;
595 int error;
596
b3b94faa 597 if (ndentry->d_inode) {
feaa7bba 598 nip = GFS2_I(ndentry->d_inode);
b3b94faa
DT		 599 if (ip == nip)
600 return 0;
601 }
602
b3b94faa
DT		 603 /* Make sure we aren't trying to move a dirctory into it's subdir */
604
605 if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
606 dir_rename = 1;
607
608 error = gfs2_glock_nq_init(sdp->sd_rename_gl,
609 LM_ST_EXCLUSIVE, 0,
610 &r_gh);
611 if (error)
612 goto out;
613
614 error = gfs2_ok_to_move(ip, ndip);
615 if (error)
616 goto out_gunlock_r;
617 }
618
d9d1ca30 619 num_gh = 1;
b3b94faa 620 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
d9d1ca30
SW		 621 if (odip != ndip) {
622 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
623 num_gh++;
624 }
625 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
626 num_gh++;
b3b94faa 627
d9d1ca30
SW		 628 if (nip) {
629 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
630 num_gh++;
631 }
b3b94faa
DT		 632
633 error = gfs2_glock_nq_m(num_gh, ghs);
634 if (error)
635 goto out_uninit;
636
637 /* Check out the old directory */
638
639 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
640 if (error)
641 goto out_gunlock;
642
643 /* Check out the new directory */
644
645 if (nip) {
646 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
647 if (error)
648 goto out_gunlock;
649
650 if (S_ISDIR(nip->i_di.di_mode)) {
651 if (nip->i_di.di_entries < 2) {
652 if (gfs2_consist_inode(nip))
653 gfs2_dinode_print(&nip->i_di);
654 error = -EIO;
655 goto out_gunlock;
656 }
657 if (nip->i_di.di_entries > 2) {
658 error = -ENOTEMPTY;
659 goto out_gunlock;
660 }
661 }
662 } else {
faf450ef 663 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
b3b94faa
DT		 664 if (error)
665 goto out_gunlock;
666
c752666c 667 error = gfs2_dir_search(ndir, &ndentry->d_name, NULL, NULL);
b3b94faa
DT		 668 switch (error) {
669 case -ENOENT:
670 error = 0;
671 break;
672 case 0:
673 error = -EEXIST;
674 default:
675 goto out_gunlock;
676 };
677
678 if (odip != ndip) {
679 if (!ndip->i_di.di_nlink) {
680 error = -EINVAL;
681 goto out_gunlock;
682 }
683 if (ndip->i_di.di_entries == (uint32_t)-1) {
684 error = -EFBIG;
685 goto out_gunlock;
686 }
687 if (S_ISDIR(ip->i_di.di_mode) &&
688 ndip->i_di.di_nlink == (uint32_t)-1) {
689 error = -EMLINK;
690 goto out_gunlock;
691 }
692 }
693 }
694
695 /* Check out the dir to be renamed */
696
697 if (dir_rename) {
faf450ef 698 error = permission(odentry->d_inode, MAY_WRITE, NULL);
b3b94faa
DT		 699 if (error)
700 goto out_gunlock;
701 }
702
c752666c
SW		 703 alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
704 if (error < 0)
b3b94faa 705 goto out_gunlock;
c752666c 706 error = 0;
b3b94faa
DT		 707
708 if (alloc_required) {
709 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
710
711 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
712 if (error)
713 goto out_alloc;
714
715 error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
716 ndip->i_di.di_gid);
717 if (error)
718 goto out_gunlock_q;
719
720 al->al_requested = sdp->sd_max_dirres;
721
722 error = gfs2_inplace_reserve(ndip);
723 if (error)
724 goto out_gunlock_q;
725
fe1bdedc 726 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
b3b94faa
DT		 727 al->al_rgd->rd_ri.ri_length +
728 4 * RES_DINODE + 4 * RES_LEAF +
feaa7bba 729 RES_STATFS + RES_QUOTA, 0);
b3b94faa
DT		 730 if (error)
731 goto out_ipreserv;
732 } else {
733 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
feaa7bba 734 5 * RES_LEAF, 0);
b3b94faa
DT		 735 if (error)
736 goto out_gunlock;
737 }
738
739 /* Remove the target file, if it exists */
740
741 if (nip) {
742 if (S_ISDIR(nip->i_di.di_mode))
feaa7bba
SW		 743 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
744 else {
745 error = gfs2_dir_del(ndip, &ndentry->d_name);
746 if (error)
747 goto out_end_trans;
748 error = gfs2_change_nlink(nip, -1);
749 }
b3b94faa
DT		 750 if (error)
751 goto out_end_trans;
752 }
753
754 if (dir_rename) {
755 struct qstr name;
71b86f56 756 gfs2_str2qstr(&name, "..");
b3b94faa
DT		 757
758 error = gfs2_change_nlink(ndip, +1);
759 if (error)
760 goto out_end_trans;
761 error = gfs2_change_nlink(odip, -1);
762 if (error)
763 goto out_end_trans;
764
765 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
766 if (error)
767 goto out_end_trans;
768 } else {
769 struct buffer_head *dibh;
770 error = gfs2_meta_inode_buffer(ip, &dibh);
771 if (error)
772 goto out_end_trans;
773 ip->i_di.di_ctime = get_seconds();
d4e9c4c3 774 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
b3b94faa
DT		 775 gfs2_dinode_out(&ip->i_di, dibh->b_data);
776 brelse(dibh);
777 }
778
779 error = gfs2_dir_del(odip, &odentry->d_name);
780 if (error)
781 goto out_end_trans;
782
c752666c 783 error = gfs2_dir_add(ndir, &ndentry->d_name, &ip->i_num,
b3b94faa
DT		 784 IF2DT(ip->i_di.di_mode));
785 if (error)
786 goto out_end_trans;
787
feaa7bba 788out_end_trans:
b3b94faa 789 gfs2_trans_end(sdp);
feaa7bba 790out_ipreserv:
b3b94faa
DT		 791 if (alloc_required)
792 gfs2_inplace_release(ndip);
feaa7bba 793out_gunlock_q:
b3b94faa
DT		 794 if (alloc_required)
795 gfs2_quota_unlock(ndip);
feaa7bba 796out_alloc:
b3b94faa
DT		 797 if (alloc_required)
798 gfs2_alloc_put(ndip);
feaa7bba 799out_gunlock:
b3b94faa 800 gfs2_glock_dq_m(num_gh, ghs);
feaa7bba 801out_uninit:
b3b94faa
DT		 802 for (x = 0; x < num_gh; x++)
803 gfs2_holder_uninit(ghs + x);
feaa7bba 804out_gunlock_r:
b3b94faa
DT		 805 if (dir_rename)
806 gfs2_glock_dq_uninit(&r_gh);
feaa7bba 807out:
b3b94faa
DT		 808 return error;
809}
810
811/**
812 * gfs2_readlink - Read the value of a symlink
813 * @dentry: the symlink
814 * @buf: the buffer to read the symlink data into
815 * @size: the size of the buffer
816 *
817 * Returns: errno
818 */
819
820static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
821 int user_size)
822{
feaa7bba 823 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
b3b94faa
DT		 824 char array[GFS2_FAST_NAME_SIZE], *buf = array;
825 unsigned int len = GFS2_FAST_NAME_SIZE;
826 int error;
827
b3b94faa
DT		 828 error = gfs2_readlinki(ip, &buf, &len);
829 if (error)
830 return error;
831
832 if (user_size > len - 1)
833 user_size = len - 1;
834
835 if (copy_to_user(user_buf, buf, user_size))
836 error = -EFAULT;
837 else
838 error = user_size;
839
840 if (buf != array)
841 kfree(buf);
842
843 return error;
844}
845
846/**
847 * gfs2_follow_link - Follow a symbolic link
848 * @dentry: The dentry of the link
849 * @nd: Data that we pass to vfs_follow_link()
850 *
851 * This can handle symlinks of any size. It is optimised for symlinks
852 * under GFS2_FAST_NAME_SIZE.
853 *
854 * Returns: 0 on success or error code
855 */
856
857static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
858{
feaa7bba 859 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
b3b94faa
DT		 860 char array[GFS2_FAST_NAME_SIZE], *buf = array;
861 unsigned int len = GFS2_FAST_NAME_SIZE;
862 int error;
863
b3b94faa
DT		 864 error = gfs2_readlinki(ip, &buf, &len);
865 if (!error) {
866 error = vfs_follow_link(nd, buf);
867 if (buf != array)
868 kfree(buf);
869 }
870
871 return ERR_PTR(error);
872}
873
874/**
875 * gfs2_permission -
876 * @inode:
877 * @mask:
878 * @nd: passed from Linux VFS, ignored by us
879 *
880 * Returns: errno
881 */
882
883static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
884{
feaa7bba 885 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa
DT		 886 struct gfs2_holder i_gh;
887 int error;
888
b3b94faa
DT		 889 if (ip->i_vn == ip->i_gl->gl_vn)
890 return generic_permission(inode, mask, gfs2_check_acl);
891
faf450ef 892 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
b3b94faa
DT		 893 if (!error) {
894 error = generic_permission(inode, mask, gfs2_check_acl_locked);
895 gfs2_glock_dq_uninit(&i_gh);
896 }
897
898 return error;
899}
900
901static int setattr_size(struct inode *inode, struct iattr *attr)
902{
feaa7bba 903 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa
DT		 904 int error;
905
906 if (attr->ia_size != ip->i_di.di_size) {
907 error = vmtruncate(inode, attr->ia_size);
908 if (error)
909 return error;
910 }
911
aa6a85a9 912 error = gfs2_truncatei(ip, attr->ia_size);
b3b94faa
DT		 913 if (error)
914 return error;
915
916 return error;
917}
918
919static int setattr_chown(struct inode *inode, struct iattr *attr)
920{
feaa7bba
SW		 921 struct gfs2_inode *ip = GFS2_I(inode);
922 struct gfs2_sbd *sdp = GFS2_SB(inode);
b3b94faa
DT		 923 struct buffer_head *dibh;
924 uint32_t ouid, ogid, nuid, ngid;
925 int error;
926
927 ouid = ip->i_di.di_uid;
928 ogid = ip->i_di.di_gid;
929 nuid = attr->ia_uid;
930 ngid = attr->ia_gid;
931
932 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
933 ouid = nuid = NO_QUOTA_CHANGE;
934 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
935 ogid = ngid = NO_QUOTA_CHANGE;
936
937 gfs2_alloc_get(ip);
938
939 error = gfs2_quota_lock(ip, nuid, ngid);
940 if (error)
941 goto out_alloc;
942
943 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
944 error = gfs2_quota_check(ip, nuid, ngid);
945 if (error)
946 goto out_gunlock_q;
947 }
948
949 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
950 if (error)
951 goto out_gunlock_q;
952
953 error = gfs2_meta_inode_buffer(ip, &dibh);
954 if (error)
955 goto out_end_trans;
956
957 error = inode_setattr(inode, attr);
958 gfs2_assert_warn(sdp, !error);
959 gfs2_inode_attr_out(ip);
960
d4e9c4c3 961 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
b3b94faa
DT		 962 gfs2_dinode_out(&ip->i_di, dibh->b_data);
963 brelse(dibh);
964
965 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
af18ddb8
SW		 966 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
967 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
b3b94faa
DT		 968 }
969
970 out_end_trans:
971 gfs2_trans_end(sdp);
972
973 out_gunlock_q:
974 gfs2_quota_unlock(ip);
975
976 out_alloc:
977 gfs2_alloc_put(ip);
978
979 return error;
980}
981
982/**
983 * gfs2_setattr - Change attributes on an inode
984 * @dentry: The dentry which is changing
985 * @attr: The structure describing the change
986 *
987 * The VFS layer wants to change one or more of an inodes attributes. Write
988 * that change out to disk.
989 *
990 * Returns: errno
991 */
992
993static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
994{
995 struct inode *inode = dentry->d_inode;
feaa7bba 996 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa
DT		 997 struct gfs2_holder i_gh;
998 int error;
999
b3b94faa
DT		 1000 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1001 if (error)
1002 return error;
1003
1004 error = -EPERM;
1005 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1006 goto out;
1007
1008 error = inode_change_ok(inode, attr);
1009 if (error)
1010 goto out;
1011
1012 if (attr->ia_valid & ATTR_SIZE)
1013 error = setattr_size(inode, attr);
1014 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1015 error = setattr_chown(inode, attr);
1016 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1017 error = gfs2_acl_chmod(ip, attr);
1018 else
1019 error = gfs2_setattr_simple(ip, attr);
1020
1021 out:
1022 gfs2_glock_dq_uninit(&i_gh);
1023
1024 if (!error)
1025 mark_inode_dirty(inode);
1026
1027 return error;
1028}
1029
1030/**
1031 * gfs2_getattr - Read out an inode's attributes
1032 * @mnt: ?
1033 * @dentry: The dentry to stat
1034 * @stat: The inode's stats
1035 *
1036 * Returns: errno
1037 */
1038
1039static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1040 struct kstat *stat)
1041{
1042 struct inode *inode = dentry->d_inode;
feaa7bba 1043 struct gfs2_inode *ip = GFS2_I(inode);
b3b94faa
DT		 1044 struct gfs2_holder gh;
1045 int error;
1046
b3b94faa
DT		 1047 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1048 if (!error) {
1049 generic_fillattr(inode, stat);
1050 gfs2_glock_dq_uninit(&gh);
1051 }
1052
1053 return error;
1054}
1055
1056static int gfs2_setxattr(struct dentry *dentry, const char *name,
1057 const void *data, size_t size, int flags)
1058{
feaa7bba 1059 struct inode *inode = dentry->d_inode;
b3b94faa
DT		 1060 struct gfs2_ea_request er;
1061
b3b94faa
DT		 1062 memset(&er, 0, sizeof(struct gfs2_ea_request));
1063 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1064 if (er.er_type == GFS2_EATYPE_UNUSED)
1065 return -EOPNOTSUPP;
1066 er.er_data = (char *)data;
1067 er.er_name_len = strlen(er.er_name);
1068 er.er_data_len = size;
1069 er.er_flags = flags;
1070
feaa7bba 1071 gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
b3b94faa 1072
feaa7bba 1073 return gfs2_ea_set(GFS2_I(inode), &er);
b3b94faa
DT		 1074}
1075
1076static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1077 void *data, size_t size)
1078{
1079 struct gfs2_ea_request er;
1080
b3b94faa
DT		 1081 memset(&er, 0, sizeof(struct gfs2_ea_request));
1082 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1083 if (er.er_type == GFS2_EATYPE_UNUSED)
1084 return -EOPNOTSUPP;
1085 er.er_data = data;
1086 er.er_name_len = strlen(er.er_name);
1087 er.er_data_len = size;
1088
feaa7bba 1089 return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
b3b94faa
DT		 1090}
1091
1092static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1093{
1094 struct gfs2_ea_request er;
1095
b3b94faa
DT		 1096 memset(&er, 0, sizeof(struct gfs2_ea_request));
1097 er.er_data = (size) ? buffer : NULL;
1098 er.er_data_len = size;
1099
feaa7bba 1100 return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
b3b94faa
DT		 1101}
1102
1103static int gfs2_removexattr(struct dentry *dentry, const char *name)
1104{
1105 struct gfs2_ea_request er;
1106
b3b94faa
DT		 1107 memset(&er, 0, sizeof(struct gfs2_ea_request));
1108 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1109 if (er.er_type == GFS2_EATYPE_UNUSED)
1110 return -EOPNOTSUPP;
1111 er.er_name_len = strlen(er.er_name);
1112
feaa7bba 1113 return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
b3b94faa
DT		 1114}
1115
1116struct inode_operations gfs2_file_iops = {
1117 .permission = gfs2_permission,
1118 .setattr = gfs2_setattr,
1119 .getattr = gfs2_getattr,
1120 .setxattr = gfs2_setxattr,
1121 .getxattr = gfs2_getxattr,
1122 .listxattr = gfs2_listxattr,
1123 .removexattr = gfs2_removexattr,
1124};
1125
1126struct inode_operations gfs2_dev_iops = {
1127 .permission = gfs2_permission,
1128 .setattr = gfs2_setattr,
1129 .getattr = gfs2_getattr,
1130 .setxattr = gfs2_setxattr,
1131 .getxattr = gfs2_getxattr,
1132 .listxattr = gfs2_listxattr,
1133 .removexattr = gfs2_removexattr,
1134};
1135
1136struct inode_operations gfs2_dir_iops = {
1137 .create = gfs2_create,
1138 .lookup = gfs2_lookup,
1139 .link = gfs2_link,
1140 .unlink = gfs2_unlink,
1141 .symlink = gfs2_symlink,
1142 .mkdir = gfs2_mkdir,
1143 .rmdir = gfs2_rmdir,
1144 .mknod = gfs2_mknod,
1145 .rename = gfs2_rename,
1146 .permission = gfs2_permission,
1147 .setattr = gfs2_setattr,
1148 .getattr = gfs2_getattr,
1149 .setxattr = gfs2_setxattr,
1150 .getxattr = gfs2_getxattr,
1151 .listxattr = gfs2_listxattr,
1152 .removexattr = gfs2_removexattr,
1153};
1154
1155struct inode_operations gfs2_symlink_iops = {
1156 .readlink = gfs2_readlink,
1157 .follow_link = gfs2_follow_link,
1158 .permission = gfs2_permission,
1159 .setattr = gfs2_setattr,
1160 .getattr = gfs2_getattr,
1161 .setxattr = gfs2_setxattr,
1162 .getxattr = gfs2_getxattr,
1163 .listxattr = gfs2_listxattr,
1164 .removexattr = gfs2_removexattr,
1165};
1166
kernel source for telekom puls (alcatel/mediatek)