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[GFS2] Macros removal in gfs2.h
[deliverable/linux.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>
5c676f6d 20#include <linux/gfs2_ondisk.h>
b3b94faa
DT		 21#include <asm/semaphore.h>
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"
41#include "unlinked.h"
5c676f6d 42#include "util.h"
b3b94faa
DT		 43
44/**
45 * gfs2_create - Create a file
46 * @dir: The directory in which to create the file
47 * @dentry: The dentry of the new file
48 * @mode: The mode of the new file
49 *
50 * Returns: errno
51 */
52
53static int gfs2_create(struct inode *dir, struct dentry *dentry,
54 int mode, struct nameidata *nd)
55{
5c676f6d 56 struct gfs2_inode *dip = dir->u.generic_ip;
b3b94faa
DT		 57 struct gfs2_sbd *sdp = dip->i_sbd;
58 struct gfs2_holder ghs[2];
59 struct inode *inode;
60 int new = 1;
61 int error;
62
b3b94faa
DT		 63 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
64
65 for (;;) {
7359a19c
SW		 66 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
67 if (!IS_ERR(inode)) {
b3b94faa
DT		 68 gfs2_trans_end(sdp);
69 if (dip->i_alloc.al_rgd)
70 gfs2_inplace_release(dip);
71 gfs2_quota_unlock(dip);
72 gfs2_alloc_put(dip);
73 gfs2_glock_dq_uninit_m(2, ghs);
74 break;
7359a19c 75 } else if (PTR_ERR(inode) != -EEXIST ||
b3b94faa
DT		 76 (nd->intent.open.flags & O_EXCL)) {
77 gfs2_holder_uninit(ghs);
7359a19c 78 return PTR_ERR(inode);
b3b94faa
DT		 79 }
80
7359a19c 81 error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode);
b3b94faa
DT		 82 if (!error) {
83 new = 0;
84 gfs2_holder_uninit(ghs);
85 break;
86 } else if (error != -ENOENT) {
87 gfs2_holder_uninit(ghs);
88 return error;
89 }
90 }
91
b3b94faa
DT		 92 d_instantiate(dentry, inode);
93 if (new)
94 mark_inode_dirty(inode);
95
96 return 0;
97}
98
99/**
100 * gfs2_lookup - Look up a filename in a directory and return its inode
101 * @dir: The directory inode
102 * @dentry: The dentry of the new inode
103 * @nd: passed from Linux VFS, ignored by us
104 *
105 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
106 *
107 * Returns: errno
108 */
109
110static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
111 struct nameidata *nd)
112{
5c676f6d 113 struct gfs2_inode *dip = dir->u.generic_ip;
b3b94faa
DT		 114 struct gfs2_sbd *sdp = dip->i_sbd;
115 struct inode *inode = NULL;
116 int error;
117
b3b94faa
DT		 118 if (!sdp->sd_args.ar_localcaching)
119 dentry->d_op = &gfs2_dops;
120
7359a19c
SW		 121 error = gfs2_lookupi(dir, &dentry->d_name, 0, &inode);
122 if (error && error != -ENOENT)
b3b94faa
DT		 123 return ERR_PTR(error);
124
125 if (inode)
126 return d_splice_alias(inode, dentry);
127 d_add(dentry, inode);
128
129 return NULL;
130}
131
132/**
133 * gfs2_link - Link to a file
134 * @old_dentry: The inode to link
135 * @dir: Add link to this directory
136 * @dentry: The name of the link
137 *
138 * Link the inode in "old_dentry" into the directory "dir" with the
139 * name in "dentry".
140 *
141 * Returns: errno
142 */
143
144static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
145 struct dentry *dentry)
146{
5c676f6d 147 struct gfs2_inode *dip = dir->u.generic_ip;
b3b94faa
DT		 148 struct gfs2_sbd *sdp = dip->i_sbd;
149 struct inode *inode = old_dentry->d_inode;
5c676f6d 150 struct gfs2_inode *ip = inode->u.generic_ip;
b3b94faa
DT		 151 struct gfs2_holder ghs[2];
152 int alloc_required;
153 int error;
154
b3b94faa
DT		 155 if (S_ISDIR(ip->i_di.di_mode))
156 return -EPERM;
157
158 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
159 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
160
161 error = gfs2_glock_nq_m(2, ghs);
162 if (error)
163 goto out;
164
165 error = gfs2_repermission(dir, MAY_WRITE | MAY_EXEC, NULL);
166 if (error)
167 goto out_gunlock;
168
169 error = gfs2_dir_search(dip, &dentry->d_name, NULL, NULL);
170 switch (error) {
171 case -ENOENT:
172 break;
173 case 0:
174 error = -EEXIST;
175 default:
176 goto out_gunlock;
177 }
178
179 error = -EINVAL;
180 if (!dip->i_di.di_nlink)
181 goto out_gunlock;
182 error = -EFBIG;
183 if (dip->i_di.di_entries == (uint32_t)-1)
184 goto out_gunlock;
185 error = -EPERM;
186 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
187 goto out_gunlock;
188 error = -EINVAL;
189 if (!ip->i_di.di_nlink)
190 goto out_gunlock;
191 error = -EMLINK;
192 if (ip->i_di.di_nlink == (uint32_t)-1)
193 goto out_gunlock;
194
195 error = gfs2_diradd_alloc_required(dip, &dentry->d_name,
196 &alloc_required);
197 if (error)
198 goto out_gunlock;
199
200 if (alloc_required) {
201 struct gfs2_alloc *al = gfs2_alloc_get(dip);
202
203 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
204 if (error)
205 goto out_alloc;
206
207 error = gfs2_quota_check(dip, dip->i_di.di_uid,
208 dip->i_di.di_gid);
209 if (error)
210 goto out_gunlock_q;
211
212 al->al_requested = sdp->sd_max_dirres;
213
214 error = gfs2_inplace_reserve(dip);
215 if (error)
216 goto out_gunlock_q;
217
218 error = gfs2_trans_begin(sdp,
219 sdp->sd_max_dirres +
220 al->al_rgd->rd_ri.ri_length +
221 2 * RES_DINODE + RES_STATFS +
222 RES_QUOTA, 0);
223 if (error)
224 goto out_ipres;
225 } else {
226 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
227 if (error)
228 goto out_ipres;
229 }
230
231 error = gfs2_dir_add(dip, &dentry->d_name, &ip->i_num,
232 IF2DT(ip->i_di.di_mode));
233 if (error)
234 goto out_end_trans;
235
236 error = gfs2_change_nlink(ip, +1);
237
238 out_end_trans:
239 gfs2_trans_end(sdp);
240
241 out_ipres:
242 if (alloc_required)
243 gfs2_inplace_release(dip);
244
245 out_gunlock_q:
246 if (alloc_required)
247 gfs2_quota_unlock(dip);
248
249 out_alloc:
250 if (alloc_required)
251 gfs2_alloc_put(dip);
252
253 out_gunlock:
254 gfs2_glock_dq_m(2, ghs);
255
256 out:
257 gfs2_holder_uninit(ghs);
258 gfs2_holder_uninit(ghs + 1);
259
260 if (!error) {
261 atomic_inc(&inode->i_count);
262 d_instantiate(dentry, inode);
263 mark_inode_dirty(inode);
264 }
265
266 return error;
267}
268
269/**
270 * gfs2_unlink - Unlink a file
271 * @dir: The inode of the directory containing the file to unlink
272 * @dentry: The file itself
273 *
274 * Unlink a file. Call gfs2_unlinki()
275 *
276 * Returns: errno
277 */
278
279static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
280{
5c676f6d 281 struct gfs2_inode *dip = dir->u.generic_ip;
b3b94faa 282 struct gfs2_sbd *sdp = dip->i_sbd;
5c676f6d 283 struct gfs2_inode *ip = dentry->d_inode->u.generic_ip;
b3b94faa
DT		 284 struct gfs2_unlinked *ul;
285 struct gfs2_holder ghs[2];
286 int error;
287
b3b94faa
DT		 288 error = gfs2_unlinked_get(sdp, &ul);
289 if (error)
290 return error;
291
292 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
293 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
294
295 error = gfs2_glock_nq_m(2, ghs);
296 if (error)
297 goto out;
298
299 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
300 if (error)
301 goto out_gunlock;
302
303 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF +
304 RES_UNLINKED, 0);
305 if (error)
306 goto out_gunlock;
307
308 error = gfs2_unlinki(dip, &dentry->d_name, ip,ul);
309
310 gfs2_trans_end(sdp);
311
312 out_gunlock:
313 gfs2_glock_dq_m(2, ghs);
314
315 out:
316 gfs2_holder_uninit(ghs);
317 gfs2_holder_uninit(ghs + 1);
318
319 gfs2_unlinked_put(sdp, ul);
320
321 return error;
322}
323
324/**
325 * gfs2_symlink - Create a symlink
326 * @dir: The directory to create the symlink in
327 * @dentry: The dentry to put the symlink in
328 * @symname: The thing which the link points to
329 *
330 * Returns: errno
331 */
332
333static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
334 const char *symname)
335{
5c676f6d 336 struct gfs2_inode *dip = dir->u.generic_ip, *ip;
b3b94faa
DT		 337 struct gfs2_sbd *sdp = dip->i_sbd;
338 struct gfs2_holder ghs[2];
339 struct inode *inode;
340 struct buffer_head *dibh;
341 int size;
342 int error;
343
b3b94faa
DT		 344 /* Must be stuffed with a null terminator for gfs2_follow_link() */
345 size = strlen(symname);
346 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
347 return -ENAMETOOLONG;
348
349 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
350
7359a19c
SW		 351 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
352 if (IS_ERR(inode)) {
b3b94faa 353 gfs2_holder_uninit(ghs);
7359a19c 354 return PTR_ERR(inode);
b3b94faa
DT		 355 }
356
5c676f6d 357 ip = ghs[1].gh_gl->gl_object;
b3b94faa
DT		 358
359 ip->i_di.di_size = size;
360
361 error = gfs2_meta_inode_buffer(ip, &dibh);
362
363 if (!gfs2_assert_withdraw(sdp, !error)) {
364 gfs2_dinode_out(&ip->i_di, dibh->b_data);
365 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
366 size);
367 brelse(dibh);
368 }
369
370 gfs2_trans_end(sdp);
371 if (dip->i_alloc.al_rgd)
372 gfs2_inplace_release(dip);
373 gfs2_quota_unlock(dip);
374 gfs2_alloc_put(dip);
375
376 gfs2_glock_dq_uninit_m(2, ghs);
377
b3b94faa
DT		 378 d_instantiate(dentry, inode);
379 mark_inode_dirty(inode);
380
381 return 0;
382}
383
384/**
385 * gfs2_mkdir - Make a directory
386 * @dir: The parent directory of the new one
387 * @dentry: The dentry of the new directory
388 * @mode: The mode of the new directory
389 *
390 * Returns: errno
391 */
392
393static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
394{
5c676f6d 395 struct gfs2_inode *dip = dir->u.generic_ip, *ip;
b3b94faa
DT		 396 struct gfs2_sbd *sdp = dip->i_sbd;
397 struct gfs2_holder ghs[2];
398 struct inode *inode;
399 struct buffer_head *dibh;
400 int error;
401
b3b94faa
DT		 402 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
403
7359a19c
SW		 404 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
405 if (IS_ERR(inode)) {
b3b94faa 406 gfs2_holder_uninit(ghs);
7359a19c 407 return PTR_ERR(inode);
b3b94faa
DT		 408 }
409
5c676f6d 410 ip = ghs[1].gh_gl->gl_object;
b3b94faa
DT		 411
412 ip->i_di.di_nlink = 2;
413 ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
414 ip->i_di.di_flags |= GFS2_DIF_JDATA;
415 ip->i_di.di_payload_format = GFS2_FORMAT_DE;
416 ip->i_di.di_entries = 2;
417
418 error = gfs2_meta_inode_buffer(ip, &dibh);
419
420 if (!gfs2_assert_withdraw(sdp, !error)) {
421 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
422 struct gfs2_dirent *dent;
423
424 gfs2_dirent_alloc(ip, dibh, 1, &dent);
425
426 dent->de_inum = di->di_num; /* already GFS2 endian */
427 dent->de_hash = gfs2_disk_hash(".", 1);
428 dent->de_hash = cpu_to_be32(dent->de_hash);
429 dent->de_type = DT_DIR;
430 memcpy((char *) (dent + 1), ".", 1);
431 di->di_entries = cpu_to_be32(1);
432
433 gfs2_dirent_alloc(ip, dibh, 2, &dent);
434
435 gfs2_inum_out(&dip->i_num, (char *) &dent->de_inum);
436 dent->de_hash = gfs2_disk_hash("..", 2);
437 dent->de_hash = cpu_to_be32(dent->de_hash);
438 dent->de_type = DT_DIR;
439 memcpy((char *) (dent + 1), "..", 2);
440
441 gfs2_dinode_out(&ip->i_di, (char *)di);
442
443 brelse(dibh);
444 }
445
446 error = gfs2_change_nlink(dip, +1);
447 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
448
449 gfs2_trans_end(sdp);
450 if (dip->i_alloc.al_rgd)
451 gfs2_inplace_release(dip);
452 gfs2_quota_unlock(dip);
453 gfs2_alloc_put(dip);
454
455 gfs2_glock_dq_uninit_m(2, ghs);
456
b3b94faa
DT		 457 d_instantiate(dentry, inode);
458 mark_inode_dirty(inode);
459
460 return 0;
461}
462
463/**
464 * gfs2_rmdir - Remove a directory
465 * @dir: The parent directory of the directory to be removed
466 * @dentry: The dentry of the directory to remove
467 *
468 * Remove a directory. Call gfs2_rmdiri()
469 *
470 * Returns: errno
471 */
472
473static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
474{
5c676f6d 475 struct gfs2_inode *dip = dir->u.generic_ip;
b3b94faa 476 struct gfs2_sbd *sdp = dip->i_sbd;
5c676f6d 477 struct gfs2_inode *ip = dentry->d_inode->u.generic_ip;
b3b94faa
DT		 478 struct gfs2_unlinked *ul;
479 struct gfs2_holder ghs[2];
480 int error;
481
b3b94faa
DT		 482 error = gfs2_unlinked_get(sdp, &ul);
483 if (error)
484 return error;
485
486 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
487 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
488
489 error = gfs2_glock_nq_m(2, ghs);
490 if (error)
491 goto out;
492
493 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
494 if (error)
495 goto out_gunlock;
496
497 if (ip->i_di.di_entries < 2) {
498 if (gfs2_consist_inode(ip))
499 gfs2_dinode_print(&ip->i_di);
500 error = -EIO;
501 goto out_gunlock;
502 }
503 if (ip->i_di.di_entries > 2) {
504 error = -ENOTEMPTY;
505 goto out_gunlock;
506 }
507
508 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF +
509 RES_UNLINKED, 0);
510 if (error)
511 goto out_gunlock;
512
513 error = gfs2_rmdiri(dip, &dentry->d_name, ip, ul);
514
515 gfs2_trans_end(sdp);
516
517 out_gunlock:
518 gfs2_glock_dq_m(2, ghs);
519
520 out:
521 gfs2_holder_uninit(ghs);
522 gfs2_holder_uninit(ghs + 1);
523
524 gfs2_unlinked_put(sdp, ul);
525
526 return error;
527}
528
529/**
530 * gfs2_mknod - Make a special file
531 * @dir: The directory in which the special file will reside
532 * @dentry: The dentry of the special file
533 * @mode: The mode of the special file
534 * @rdev: The device specification of the special file
535 *
536 */
537
538static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
539 dev_t dev)
540{
5c676f6d 541 struct gfs2_inode *dip = dir->u.generic_ip, *ip;
b3b94faa
DT		 542 struct gfs2_sbd *sdp = dip->i_sbd;
543 struct gfs2_holder ghs[2];
544 struct inode *inode;
545 struct buffer_head *dibh;
546 uint32_t major = 0, minor = 0;
547 int error;
548
b3b94faa
DT		 549 switch (mode & S_IFMT) {
550 case S_IFBLK:
551 case S_IFCHR:
552 major = MAJOR(dev);
553 minor = MINOR(dev);
554 break;
555 case S_IFIFO:
556 case S_IFSOCK:
557 break;
558 default:
559 return -EOPNOTSUPP;
560 };
561
562 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
563
7359a19c
SW		 564 inode = gfs2_createi(ghs, &dentry->d_name, mode);
565 if (IS_ERR(inode)) {
b3b94faa 566 gfs2_holder_uninit(ghs);
7359a19c 567 return PTR_ERR(inode);
b3b94faa
DT		 568 }
569
5c676f6d 570 ip = ghs[1].gh_gl->gl_object;
b3b94faa
DT		 571
572 ip->i_di.di_major = major;
573 ip->i_di.di_minor = minor;
574
575 error = gfs2_meta_inode_buffer(ip, &dibh);
576
577 if (!gfs2_assert_withdraw(sdp, !error)) {
578 gfs2_dinode_out(&ip->i_di, dibh->b_data);
579 brelse(dibh);
580 }
581
582 gfs2_trans_end(sdp);
583 if (dip->i_alloc.al_rgd)
584 gfs2_inplace_release(dip);
585 gfs2_quota_unlock(dip);
586 gfs2_alloc_put(dip);
587
588 gfs2_glock_dq_uninit_m(2, ghs);
589
b3b94faa
DT		 590 d_instantiate(dentry, inode);
591 mark_inode_dirty(inode);
592
593 return 0;
594}
595
596/**
597 * gfs2_rename - Rename a file
598 * @odir: Parent directory of old file name
599 * @odentry: The old dentry of the file
600 * @ndir: Parent directory of new file name
601 * @ndentry: The new dentry of the file
602 *
603 * Returns: errno
604 */
605
606static int gfs2_rename(struct inode *odir, struct dentry *odentry,
607 struct inode *ndir, struct dentry *ndentry)
608{
5c676f6d
SW		 609 struct gfs2_inode *odip = odir->u.generic_ip;
610 struct gfs2_inode *ndip = ndir->u.generic_ip;
611 struct gfs2_inode *ip = odentry->d_inode->u.generic_ip;
b3b94faa
DT		 612 struct gfs2_inode *nip = NULL;
613 struct gfs2_sbd *sdp = odip->i_sbd;
614 struct gfs2_unlinked *ul;
615 struct gfs2_holder ghs[4], r_gh;
616 unsigned int num_gh;
617 int dir_rename = 0;
618 int alloc_required;
619 unsigned int x;
620 int error;
621
b3b94faa 622 if (ndentry->d_inode) {
5c676f6d 623 nip = ndentry->d_inode->u.generic_ip;
b3b94faa
DT		 624 if (ip == nip)
625 return 0;
626 }
627
628 error = gfs2_unlinked_get(sdp, &ul);
629 if (error)
630 return error;
631
632 /* Make sure we aren't trying to move a dirctory into it's subdir */
633
634 if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
635 dir_rename = 1;
636
637 error = gfs2_glock_nq_init(sdp->sd_rename_gl,
638 LM_ST_EXCLUSIVE, 0,
639 &r_gh);
640 if (error)
641 goto out;
642
643 error = gfs2_ok_to_move(ip, ndip);
644 if (error)
645 goto out_gunlock_r;
646 }
647
648 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
649 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
650 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
651 num_gh = 3;
652
653 if (nip)
654 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
655
656 error = gfs2_glock_nq_m(num_gh, ghs);
657 if (error)
658 goto out_uninit;
659
660 /* Check out the old directory */
661
662 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
663 if (error)
664 goto out_gunlock;
665
666 /* Check out the new directory */
667
668 if (nip) {
669 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
670 if (error)
671 goto out_gunlock;
672
673 if (S_ISDIR(nip->i_di.di_mode)) {
674 if (nip->i_di.di_entries < 2) {
675 if (gfs2_consist_inode(nip))
676 gfs2_dinode_print(&nip->i_di);
677 error = -EIO;
678 goto out_gunlock;
679 }
680 if (nip->i_di.di_entries > 2) {
681 error = -ENOTEMPTY;
682 goto out_gunlock;
683 }
684 }
685 } else {
686 error = gfs2_repermission(ndir, MAY_WRITE | MAY_EXEC, NULL);
687 if (error)
688 goto out_gunlock;
689
690 error = gfs2_dir_search(ndip, &ndentry->d_name, NULL, NULL);
691 switch (error) {
692 case -ENOENT:
693 error = 0;
694 break;
695 case 0:
696 error = -EEXIST;
697 default:
698 goto out_gunlock;
699 };
700
701 if (odip != ndip) {
702 if (!ndip->i_di.di_nlink) {
703 error = -EINVAL;
704 goto out_gunlock;
705 }
706 if (ndip->i_di.di_entries == (uint32_t)-1) {
707 error = -EFBIG;
708 goto out_gunlock;
709 }
710 if (S_ISDIR(ip->i_di.di_mode) &&
711 ndip->i_di.di_nlink == (uint32_t)-1) {
712 error = -EMLINK;
713 goto out_gunlock;
714 }
715 }
716 }
717
718 /* Check out the dir to be renamed */
719
720 if (dir_rename) {
721 error = gfs2_repermission(odentry->d_inode, MAY_WRITE, NULL);
722 if (error)
723 goto out_gunlock;
724 }
725
726 error = gfs2_diradd_alloc_required(ndip, &ndentry->d_name,
727 &alloc_required);
728 if (error)
729 goto out_gunlock;
730
731 if (alloc_required) {
732 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
733
734 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
735 if (error)
736 goto out_alloc;
737
738 error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
739 ndip->i_di.di_gid);
740 if (error)
741 goto out_gunlock_q;
742
743 al->al_requested = sdp->sd_max_dirres;
744
745 error = gfs2_inplace_reserve(ndip);
746 if (error)
747 goto out_gunlock_q;
748
749 error = gfs2_trans_begin(sdp,
750 sdp->sd_max_dirres +
751 al->al_rgd->rd_ri.ri_length +
752 4 * RES_DINODE + 4 * RES_LEAF +
753 RES_UNLINKED + RES_STATFS +
754 RES_QUOTA, 0);
755 if (error)
756 goto out_ipreserv;
757 } else {
758 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
759 5 * RES_LEAF +
760 RES_UNLINKED, 0);
761 if (error)
762 goto out_gunlock;
763 }
764
765 /* Remove the target file, if it exists */
766
767 if (nip) {
768 if (S_ISDIR(nip->i_di.di_mode))
769 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip, ul);
770 else
771 error = gfs2_unlinki(ndip, &ndentry->d_name, nip, ul);
772 if (error)
773 goto out_end_trans;
774 }
775
776 if (dir_rename) {
777 struct qstr name;
778 name.len = 2;
779 name.name = "..";
780
781 error = gfs2_change_nlink(ndip, +1);
782 if (error)
783 goto out_end_trans;
784 error = gfs2_change_nlink(odip, -1);
785 if (error)
786 goto out_end_trans;
787
788 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
789 if (error)
790 goto out_end_trans;
791 } else {
792 struct buffer_head *dibh;
793 error = gfs2_meta_inode_buffer(ip, &dibh);
794 if (error)
795 goto out_end_trans;
796 ip->i_di.di_ctime = get_seconds();
d4e9c4c3 797 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
b3b94faa
DT		 798 gfs2_dinode_out(&ip->i_di, dibh->b_data);
799 brelse(dibh);
800 }
801
802 error = gfs2_dir_del(odip, &odentry->d_name);
803 if (error)
804 goto out_end_trans;
805
806 error = gfs2_dir_add(ndip, &ndentry->d_name, &ip->i_num,
807 IF2DT(ip->i_di.di_mode));
808 if (error)
809 goto out_end_trans;
810
811 out_end_trans:
812 gfs2_trans_end(sdp);
813
814 out_ipreserv:
815 if (alloc_required)
816 gfs2_inplace_release(ndip);
817
818 out_gunlock_q:
819 if (alloc_required)
820 gfs2_quota_unlock(ndip);
821
822 out_alloc:
823 if (alloc_required)
824 gfs2_alloc_put(ndip);
825
826 out_gunlock:
827 gfs2_glock_dq_m(num_gh, ghs);
828
829 out_uninit:
830 for (x = 0; x < num_gh; x++)
831 gfs2_holder_uninit(ghs + x);
832
833 out_gunlock_r:
834 if (dir_rename)
835 gfs2_glock_dq_uninit(&r_gh);
836
837 out:
838 gfs2_unlinked_put(sdp, ul);
839
840 return error;
841}
842
843/**
844 * gfs2_readlink - Read the value of a symlink
845 * @dentry: the symlink
846 * @buf: the buffer to read the symlink data into
847 * @size: the size of the buffer
848 *
849 * Returns: errno
850 */
851
852static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
853 int user_size)
854{
5c676f6d 855 struct gfs2_inode *ip = dentry->d_inode->u.generic_ip;
b3b94faa
DT		 856 char array[GFS2_FAST_NAME_SIZE], *buf = array;
857 unsigned int len = GFS2_FAST_NAME_SIZE;
858 int error;
859
b3b94faa
DT		 860 error = gfs2_readlinki(ip, &buf, &len);
861 if (error)
862 return error;
863
864 if (user_size > len - 1)
865 user_size = len - 1;
866
867 if (copy_to_user(user_buf, buf, user_size))
868 error = -EFAULT;
869 else
870 error = user_size;
871
872 if (buf != array)
873 kfree(buf);
874
875 return error;
876}
877
878/**
879 * gfs2_follow_link - Follow a symbolic link
880 * @dentry: The dentry of the link
881 * @nd: Data that we pass to vfs_follow_link()
882 *
883 * This can handle symlinks of any size. It is optimised for symlinks
884 * under GFS2_FAST_NAME_SIZE.
885 *
886 * Returns: 0 on success or error code
887 */
888
889static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
890{
5c676f6d 891 struct gfs2_inode *ip = dentry->d_inode->u.generic_ip;
b3b94faa
DT		 892 char array[GFS2_FAST_NAME_SIZE], *buf = array;
893 unsigned int len = GFS2_FAST_NAME_SIZE;
894 int error;
895
b3b94faa
DT		 896 error = gfs2_readlinki(ip, &buf, &len);
897 if (!error) {
898 error = vfs_follow_link(nd, buf);
899 if (buf != array)
900 kfree(buf);
901 }
902
903 return ERR_PTR(error);
904}
905
906/**
907 * gfs2_permission -
908 * @inode:
909 * @mask:
910 * @nd: passed from Linux VFS, ignored by us
911 *
912 * Returns: errno
913 */
914
915static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
916{
5c676f6d 917 struct gfs2_inode *ip = inode->u.generic_ip;
b3b94faa
DT		 918 struct gfs2_holder i_gh;
919 int error;
920
b3b94faa
DT		 921 if (ip->i_vn == ip->i_gl->gl_vn)
922 return generic_permission(inode, mask, gfs2_check_acl);
923
924 error = gfs2_glock_nq_init(ip->i_gl,
925 LM_ST_SHARED, LM_FLAG_ANY,
926 &i_gh);
927 if (!error) {
928 error = generic_permission(inode, mask, gfs2_check_acl_locked);
929 gfs2_glock_dq_uninit(&i_gh);
930 }
931
932 return error;
933}
934
935static int setattr_size(struct inode *inode, struct iattr *attr)
936{
5c676f6d 937 struct gfs2_inode *ip = inode->u.generic_ip;
b3b94faa
DT		 938 int error;
939
940 if (attr->ia_size != ip->i_di.di_size) {
941 error = vmtruncate(inode, attr->ia_size);
942 if (error)
943 return error;
944 }
945
aa6a85a9 946 error = gfs2_truncatei(ip, attr->ia_size);
b3b94faa
DT		 947 if (error)
948 return error;
949
950 return error;
951}
952
953static int setattr_chown(struct inode *inode, struct iattr *attr)
954{
5c676f6d 955 struct gfs2_inode *ip = inode->u.generic_ip;
b3b94faa
DT		 956 struct gfs2_sbd *sdp = ip->i_sbd;
957 struct buffer_head *dibh;
958 uint32_t ouid, ogid, nuid, ngid;
959 int error;
960
961 ouid = ip->i_di.di_uid;
962 ogid = ip->i_di.di_gid;
963 nuid = attr->ia_uid;
964 ngid = attr->ia_gid;
965
966 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
967 ouid = nuid = NO_QUOTA_CHANGE;
968 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
969 ogid = ngid = NO_QUOTA_CHANGE;
970
971 gfs2_alloc_get(ip);
972
973 error = gfs2_quota_lock(ip, nuid, ngid);
974 if (error)
975 goto out_alloc;
976
977 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
978 error = gfs2_quota_check(ip, nuid, ngid);
979 if (error)
980 goto out_gunlock_q;
981 }
982
983 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
984 if (error)
985 goto out_gunlock_q;
986
987 error = gfs2_meta_inode_buffer(ip, &dibh);
988 if (error)
989 goto out_end_trans;
990
991 error = inode_setattr(inode, attr);
992 gfs2_assert_warn(sdp, !error);
993 gfs2_inode_attr_out(ip);
994
d4e9c4c3 995 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
b3b94faa
DT		 996 gfs2_dinode_out(&ip->i_di, dibh->b_data);
997 brelse(dibh);
998
999 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1000 gfs2_quota_change(ip, -ip->i_di.di_blocks,
1001 ouid, ogid);
1002 gfs2_quota_change(ip, ip->i_di.di_blocks,
1003 nuid, ngid);
1004 }
1005
1006 out_end_trans:
1007 gfs2_trans_end(sdp);
1008
1009 out_gunlock_q:
1010 gfs2_quota_unlock(ip);
1011
1012 out_alloc:
1013 gfs2_alloc_put(ip);
1014
1015 return error;
1016}
1017
1018/**
1019 * gfs2_setattr - Change attributes on an inode
1020 * @dentry: The dentry which is changing
1021 * @attr: The structure describing the change
1022 *
1023 * The VFS layer wants to change one or more of an inodes attributes. Write
1024 * that change out to disk.
1025 *
1026 * Returns: errno
1027 */
1028
1029static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1030{
1031 struct inode *inode = dentry->d_inode;
5c676f6d 1032 struct gfs2_inode *ip = inode->u.generic_ip;
b3b94faa
DT		 1033 struct gfs2_holder i_gh;
1034 int error;
1035
b3b94faa
DT		 1036 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1037 if (error)
1038 return error;
1039
1040 error = -EPERM;
1041 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1042 goto out;
1043
1044 error = inode_change_ok(inode, attr);
1045 if (error)
1046 goto out;
1047
1048 if (attr->ia_valid & ATTR_SIZE)
1049 error = setattr_size(inode, attr);
1050 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1051 error = setattr_chown(inode, attr);
1052 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1053 error = gfs2_acl_chmod(ip, attr);
1054 else
1055 error = gfs2_setattr_simple(ip, attr);
1056
1057 out:
1058 gfs2_glock_dq_uninit(&i_gh);
1059
1060 if (!error)
1061 mark_inode_dirty(inode);
1062
1063 return error;
1064}
1065
1066/**
1067 * gfs2_getattr - Read out an inode's attributes
1068 * @mnt: ?
1069 * @dentry: The dentry to stat
1070 * @stat: The inode's stats
1071 *
1072 * Returns: errno
1073 */
1074
1075static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1076 struct kstat *stat)
1077{
1078 struct inode *inode = dentry->d_inode;
5c676f6d 1079 struct gfs2_inode *ip = inode->u.generic_ip;
b3b94faa
DT		 1080 struct gfs2_holder gh;
1081 int error;
1082
b3b94faa
DT		 1083 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1084 if (!error) {
1085 generic_fillattr(inode, stat);
1086 gfs2_glock_dq_uninit(&gh);
1087 }
1088
1089 return error;
1090}
1091
1092static int gfs2_setxattr(struct dentry *dentry, const char *name,
1093 const void *data, size_t size, int flags)
1094{
5c676f6d 1095 struct gfs2_inode *ip = dentry->d_inode->u.generic_ip;
b3b94faa
DT		 1096 struct gfs2_ea_request er;
1097
b3b94faa
DT		 1098 memset(&er, 0, sizeof(struct gfs2_ea_request));
1099 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1100 if (er.er_type == GFS2_EATYPE_UNUSED)
1101 return -EOPNOTSUPP;
1102 er.er_data = (char *)data;
1103 er.er_name_len = strlen(er.er_name);
1104 er.er_data_len = size;
1105 er.er_flags = flags;
1106
1107 gfs2_assert_warn(ip->i_sbd, !(er.er_flags & GFS2_ERF_MODE));
1108
1109 return gfs2_ea_set(ip, &er);
1110}
1111
1112static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1113 void *data, size_t size)
1114{
1115 struct gfs2_ea_request er;
1116
b3b94faa
DT		 1117 memset(&er, 0, sizeof(struct gfs2_ea_request));
1118 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1119 if (er.er_type == GFS2_EATYPE_UNUSED)
1120 return -EOPNOTSUPP;
1121 er.er_data = data;
1122 er.er_name_len = strlen(er.er_name);
1123 er.er_data_len = size;
1124
5c676f6d 1125 return gfs2_ea_get(dentry->d_inode->u.generic_ip, &er);
b3b94faa
DT		 1126}
1127
1128static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1129{
1130 struct gfs2_ea_request er;
1131
b3b94faa
DT		 1132 memset(&er, 0, sizeof(struct gfs2_ea_request));
1133 er.er_data = (size) ? buffer : NULL;
1134 er.er_data_len = size;
1135
5c676f6d 1136 return gfs2_ea_list(dentry->d_inode->u.generic_ip, &er);
b3b94faa
DT		 1137}
1138
1139static int gfs2_removexattr(struct dentry *dentry, const char *name)
1140{
1141 struct gfs2_ea_request er;
1142
b3b94faa
DT		 1143 memset(&er, 0, sizeof(struct gfs2_ea_request));
1144 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1145 if (er.er_type == GFS2_EATYPE_UNUSED)
1146 return -EOPNOTSUPP;
1147 er.er_name_len = strlen(er.er_name);
1148
5c676f6d 1149 return gfs2_ea_remove(dentry->d_inode->u.generic_ip, &er);
b3b94faa
DT		 1150}
1151
1152struct inode_operations gfs2_file_iops = {
1153 .permission = gfs2_permission,
1154 .setattr = gfs2_setattr,
1155 .getattr = gfs2_getattr,
1156 .setxattr = gfs2_setxattr,
1157 .getxattr = gfs2_getxattr,
1158 .listxattr = gfs2_listxattr,
1159 .removexattr = gfs2_removexattr,
1160};
1161
1162struct inode_operations gfs2_dev_iops = {
1163 .permission = gfs2_permission,
1164 .setattr = gfs2_setattr,
1165 .getattr = gfs2_getattr,
1166 .setxattr = gfs2_setxattr,
1167 .getxattr = gfs2_getxattr,
1168 .listxattr = gfs2_listxattr,
1169 .removexattr = gfs2_removexattr,
1170};
1171
1172struct inode_operations gfs2_dir_iops = {
1173 .create = gfs2_create,
1174 .lookup = gfs2_lookup,
1175 .link = gfs2_link,
1176 .unlink = gfs2_unlink,
1177 .symlink = gfs2_symlink,
1178 .mkdir = gfs2_mkdir,
1179 .rmdir = gfs2_rmdir,
1180 .mknod = gfs2_mknod,
1181 .rename = gfs2_rename,
1182 .permission = gfs2_permission,
1183 .setattr = gfs2_setattr,
1184 .getattr = gfs2_getattr,
1185 .setxattr = gfs2_setxattr,
1186 .getxattr = gfs2_getxattr,
1187 .listxattr = gfs2_listxattr,
1188 .removexattr = gfs2_removexattr,
1189};
1190
1191struct inode_operations gfs2_symlink_iops = {
1192 .readlink = gfs2_readlink,
1193 .follow_link = gfs2_follow_link,
1194 .permission = gfs2_permission,
1195 .setattr = gfs2_setattr,
1196 .getattr = gfs2_getattr,
1197 .setxattr = gfs2_setxattr,
1198 .getxattr = gfs2_getxattr,
1199 .listxattr = gfs2_listxattr,
1200 .removexattr = gfs2_removexattr,
1201};
1202
Linux kernel - Deliverables
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