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cyclades: overall cleanup
[linux-2.6/mini2440.git] / fs / gfs2 / ops_inode.c
blobc3ac180540576a7ba8f59c9ded3bb1d52b0b7a47
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
15 #include <linux/utsname.h>
16 #include <linux/mm.h>
17 #include <linux/xattr.h>
18 #include <linux/posix_acl.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/crc32.h>
21 #include <linux/fiemap.h>
22 #include <asm/uaccess.h>
23
24 #include "gfs2.h"
25 #include "incore.h"
26 #include "acl.h"
27 #include "bmap.h"
28 #include "dir.h"
29 #include "xattr.h"
30 #include "glock.h"
31 #include "inode.h"
32 #include "meta_io.h"
33 #include "quota.h"
34 #include "rgrp.h"
35 #include "trans.h"
36 #include "util.h"
37 #include "super.h"
38
39 /**
40 * gfs2_create - Create a file
41 * @dir: The directory in which to create the file
42 * @dentry: The dentry of the new file
43 * @mode: The mode of the new file
44 *
45 * Returns: errno
46 */
47
48 static int gfs2_create(struct inode *dir, struct dentry *dentry,
49 int mode, struct nameidata *nd)
50 {
51 struct gfs2_inode *dip = GFS2_I(dir);
52 struct gfs2_sbd *sdp = GFS2_SB(dir);
53 struct gfs2_holder ghs[2];
54 struct inode *inode;
55
56 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
57
58 for (;;) {
59 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
60 if (!IS_ERR(inode)) {
61 gfs2_trans_end(sdp);
62 if (dip->i_alloc->al_rgd)
63 gfs2_inplace_release(dip);
64 gfs2_quota_unlock(dip);
65 gfs2_alloc_put(dip);
66 gfs2_glock_dq_uninit_m(2, ghs);
67 mark_inode_dirty(inode);
68 break;
69 } else if (PTR_ERR(inode) != -EEXIST ||
70 (nd && nd->flags & LOOKUP_EXCL)) {
71 gfs2_holder_uninit(ghs);
72 return PTR_ERR(inode);
73 }
74
75 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
76 if (inode) {
77 if (!IS_ERR(inode)) {
78 gfs2_holder_uninit(ghs);
79 break;
80 } else {
81 gfs2_holder_uninit(ghs);
82 return PTR_ERR(inode);
83 }
84 }
85 }
86
87 d_instantiate(dentry, inode);
88
89 return 0;
90 }
91
92 /**
93 * gfs2_lookup - Look up a filename in a directory and return its inode
94 * @dir: The directory inode
95 * @dentry: The dentry of the new inode
96 * @nd: passed from Linux VFS, ignored by us
97 *
98 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
99 *
100 * Returns: errno
101 */
102
103 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
104 struct nameidata *nd)
105 {
106 struct inode *inode = NULL;
107
108 dentry->d_op = &gfs2_dops;
109
110 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
111 if (inode && IS_ERR(inode))
112 return ERR_CAST(inode);
113
114 if (inode) {
115 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
116 struct gfs2_holder gh;
117 int error;
118 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
119 if (error) {
120 iput(inode);
121 return ERR_PTR(error);
122 }
123 gfs2_glock_dq_uninit(&gh);
124 return d_splice_alias(inode, dentry);
125 }
126 d_add(dentry, inode);
127
128 return NULL;
129 }
130
131 /**
132 * gfs2_link - Link to a file
133 * @old_dentry: The inode to link
134 * @dir: Add link to this directory
135 * @dentry: The name of the link
136 *
137 * Link the inode in "old_dentry" into the directory "dir" with the
138 * name in "dentry".
139 *
140 * Returns: errno
141 */
142
143 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
144 struct dentry *dentry)
145 {
146 struct gfs2_inode *dip = GFS2_I(dir);
147 struct gfs2_sbd *sdp = GFS2_SB(dir);
148 struct inode *inode = old_dentry->d_inode;
149 struct gfs2_inode *ip = GFS2_I(inode);
150 struct gfs2_holder ghs[2];
151 int alloc_required;
152 int error;
153
154 if (S_ISDIR(inode->i_mode))
155 return -EPERM;
156
157 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
158 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
159
160 error = gfs2_glock_nq(ghs); /* parent */
161 if (error)
162 goto out_parent;
163
164 error = gfs2_glock_nq(ghs + 1); /* child */
165 if (error)
166 goto out_child;
167
168 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
169 if (error)
170 goto out_gunlock;
171
172 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
173 switch (error) {
174 case -ENOENT:
175 break;
176 case 0:
177 error = -EEXIST;
178 default:
179 goto out_gunlock;
180 }
181
182 error = -EINVAL;
183 if (!dip->i_inode.i_nlink)
184 goto out_gunlock;
185 error = -EFBIG;
186 if (dip->i_entries == (u32)-1)
187 goto out_gunlock;
188 error = -EPERM;
189 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
190 goto out_gunlock;
191 error = -EINVAL;
192 if (!ip->i_inode.i_nlink)
193 goto out_gunlock;
194 error = -EMLINK;
195 if (ip->i_inode.i_nlink == (u32)-1)
196 goto out_gunlock;
197
198 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
199 if (error < 0)
200 goto out_gunlock;
201 error = 0;
202
203 if (alloc_required) {
204 struct gfs2_alloc *al = gfs2_alloc_get(dip);
205 if (!al) {
206 error = -ENOMEM;
207 goto out_gunlock;
208 }
209
210 error = gfs2_quota_lock_check(dip);
211 if (error)
212 goto out_alloc;
213
214 al->al_requested = sdp->sd_max_dirres;
215
216 error = gfs2_inplace_reserve(dip);
217 if (error)
218 goto out_gunlock_q;
219
220 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
221 al->al_rgd->rd_length +
222 2 * RES_DINODE + RES_STATFS +
223 RES_QUOTA, 0);
224 if (error)
225 goto out_ipres;
226 } else {
227 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
228 if (error)
229 goto out_ipres;
230 }
231
232 error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_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 out_ipres:
241 if (alloc_required)
242 gfs2_inplace_release(dip);
243 out_gunlock_q:
244 if (alloc_required)
245 gfs2_quota_unlock(dip);
246 out_alloc:
247 if (alloc_required)
248 gfs2_alloc_put(dip);
249 out_gunlock:
250 gfs2_glock_dq(ghs + 1);
251 out_child:
252 gfs2_glock_dq(ghs);
253 out_parent:
254 gfs2_holder_uninit(ghs);
255 gfs2_holder_uninit(ghs + 1);
256 if (!error) {
257 atomic_inc(&inode->i_count);
258 d_instantiate(dentry, inode);
259 mark_inode_dirty(inode);
260 }
261 return error;
262 }
263
264 /*
265 * gfs2_unlink_ok - check to see that a inode is still in a directory
266 * @dip: the directory
267 * @name: the name of the file
268 * @ip: the inode
269 *
270 * Assumes that the lock on (at least) @dip is held.
271 *
272 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
273 */
274
275 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
276 const struct gfs2_inode *ip)
277 {
278 int error;
279
280 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
281 return -EPERM;
282
283 if ((dip->i_inode.i_mode & S_ISVTX) &&
284 dip->i_inode.i_uid != current_fsuid() &&
285 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
286 return -EPERM;
287
288 if (IS_APPEND(&dip->i_inode))
289 return -EPERM;
290
291 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC);
292 if (error)
293 return error;
294
295 error = gfs2_dir_check(&dip->i_inode, name, ip);
296 if (error)
297 return error;
298
299 return 0;
300 }
301
302 /**
303 * gfs2_unlink - Unlink a file
304 * @dir: The inode of the directory containing the file to unlink
305 * @dentry: The file itself
306 *
307 * Unlink a file. Call gfs2_unlinki()
308 *
309 * Returns: errno
310 */
311
312 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
313 {
314 struct gfs2_inode *dip = GFS2_I(dir);
315 struct gfs2_sbd *sdp = GFS2_SB(dir);
316 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
317 struct gfs2_holder ghs[3];
318 struct gfs2_rgrpd *rgd;
319 struct gfs2_holder ri_gh;
320 int error;
321
322 error = gfs2_rindex_hold(sdp, &ri_gh);
323 if (error)
324 return error;
325
326 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
327 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
328
329 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
330 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
331
332
333 error = gfs2_glock_nq(ghs); /* parent */
334 if (error)
335 goto out_parent;
336
337 error = gfs2_glock_nq(ghs + 1); /* child */
338 if (error)
339 goto out_child;
340
341 error = gfs2_glock_nq(ghs + 2); /* rgrp */
342 if (error)
343 goto out_rgrp;
344
345 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
346 if (error)
347 goto out_gunlock;
348
349 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
350 if (error)
351 goto out_gunlock;
352
353 error = gfs2_dir_del(dip, &dentry->d_name);
354 if (error)
355 goto out_end_trans;
356
357 error = gfs2_change_nlink(ip, -1);
358
359 out_end_trans:
360 gfs2_trans_end(sdp);
361 out_gunlock:
362 gfs2_glock_dq(ghs + 2);
363 out_rgrp:
364 gfs2_holder_uninit(ghs + 2);
365 gfs2_glock_dq(ghs + 1);
366 out_child:
367 gfs2_holder_uninit(ghs + 1);
368 gfs2_glock_dq(ghs);
369 out_parent:
370 gfs2_holder_uninit(ghs);
371 gfs2_glock_dq_uninit(&ri_gh);
372 return error;
373 }
374
375 /**
376 * gfs2_symlink - Create a symlink
377 * @dir: The directory to create the symlink in
378 * @dentry: The dentry to put the symlink in
379 * @symname: The thing which the link points to
380 *
381 * Returns: errno
382 */
383
384 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
385 const char *symname)
386 {
387 struct gfs2_inode *dip = GFS2_I(dir), *ip;
388 struct gfs2_sbd *sdp = GFS2_SB(dir);
389 struct gfs2_holder ghs[2];
390 struct inode *inode;
391 struct buffer_head *dibh;
392 int size;
393 int error;
394
395 /* Must be stuffed with a null terminator for gfs2_follow_link() */
396 size = strlen(symname);
397 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
398 return -ENAMETOOLONG;
399
400 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
401
402 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
403 if (IS_ERR(inode)) {
404 gfs2_holder_uninit(ghs);
405 return PTR_ERR(inode);
406 }
407
408 ip = ghs[1].gh_gl->gl_object;
409
410 ip->i_disksize = size;
411 i_size_write(inode, size);
412
413 error = gfs2_meta_inode_buffer(ip, &dibh);
414
415 if (!gfs2_assert_withdraw(sdp, !error)) {
416 gfs2_dinode_out(ip, dibh->b_data);
417 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
418 size);
419 brelse(dibh);
420 }
421
422 gfs2_trans_end(sdp);
423 if (dip->i_alloc->al_rgd)
424 gfs2_inplace_release(dip);
425 gfs2_quota_unlock(dip);
426 gfs2_alloc_put(dip);
427
428 gfs2_glock_dq_uninit_m(2, ghs);
429
430 d_instantiate(dentry, inode);
431 mark_inode_dirty(inode);
432
433 return 0;
434 }
435
436 /**
437 * gfs2_mkdir - Make a directory
438 * @dir: The parent directory of the new one
439 * @dentry: The dentry of the new directory
440 * @mode: The mode of the new directory
441 *
442 * Returns: errno
443 */
444
445 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
446 {
447 struct gfs2_inode *dip = GFS2_I(dir), *ip;
448 struct gfs2_sbd *sdp = GFS2_SB(dir);
449 struct gfs2_holder ghs[2];
450 struct inode *inode;
451 struct buffer_head *dibh;
452 int error;
453
454 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
455
456 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
457 if (IS_ERR(inode)) {
458 gfs2_holder_uninit(ghs);
459 return PTR_ERR(inode);
460 }
461
462 ip = ghs[1].gh_gl->gl_object;
463
464 ip->i_inode.i_nlink = 2;
465 ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
466 ip->i_diskflags |= GFS2_DIF_JDATA;
467 ip->i_entries = 2;
468
469 error = gfs2_meta_inode_buffer(ip, &dibh);
470
471 if (!gfs2_assert_withdraw(sdp, !error)) {
472 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
473 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
474 struct qstr str;
475
476 gfs2_str2qstr(&str, ".");
477 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
478 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
479 dent->de_inum = di->di_num; /* already GFS2 endian */
480 dent->de_type = cpu_to_be16(DT_DIR);
481 di->di_entries = cpu_to_be32(1);
482
483 gfs2_str2qstr(&str, "..");
484 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
485 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
486
487 gfs2_inum_out(dip, dent);
488 dent->de_type = cpu_to_be16(DT_DIR);
489
490 gfs2_dinode_out(ip, di);
491
492 brelse(dibh);
493 }
494
495 error = gfs2_change_nlink(dip, +1);
496 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
497
498 gfs2_trans_end(sdp);
499 if (dip->i_alloc->al_rgd)
500 gfs2_inplace_release(dip);
501 gfs2_quota_unlock(dip);
502 gfs2_alloc_put(dip);
503
504 gfs2_glock_dq_uninit_m(2, ghs);
505
506 d_instantiate(dentry, inode);
507 mark_inode_dirty(inode);
508
509 return 0;
510 }
511
512 /**
513 * gfs2_rmdiri - Remove a directory
514 * @dip: The parent directory of the directory to be removed
515 * @name: The name of the directory to be removed
516 * @ip: The GFS2 inode of the directory to be removed
517 *
518 * Assumes Glocks on dip and ip are held
519 *
520 * Returns: errno
521 */
522
523 static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
524 struct gfs2_inode *ip)
525 {
526 struct qstr dotname;
527 int error;
528
529 if (ip->i_entries != 2) {
530 if (gfs2_consist_inode(ip))
531 gfs2_dinode_print(ip);
532 return -EIO;
533 }
534
535 error = gfs2_dir_del(dip, name);
536 if (error)
537 return error;
538
539 error = gfs2_change_nlink(dip, -1);
540 if (error)
541 return error;
542
543 gfs2_str2qstr(&dotname, ".");
544 error = gfs2_dir_del(ip, &dotname);
545 if (error)
546 return error;
547
548 gfs2_str2qstr(&dotname, "..");
549 error = gfs2_dir_del(ip, &dotname);
550 if (error)
551 return error;
552
553 /* It looks odd, but it really should be done twice */
554 error = gfs2_change_nlink(ip, -1);
555 if (error)
556 return error;
557
558 error = gfs2_change_nlink(ip, -1);
559 if (error)
560 return error;
561
562 return error;
563 }
564
565 /**
566 * gfs2_rmdir - Remove a directory
567 * @dir: The parent directory of the directory to be removed
568 * @dentry: The dentry of the directory to remove
569 *
570 * Remove a directory. Call gfs2_rmdiri()
571 *
572 * Returns: errno
573 */
574
575 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
576 {
577 struct gfs2_inode *dip = GFS2_I(dir);
578 struct gfs2_sbd *sdp = GFS2_SB(dir);
579 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
580 struct gfs2_holder ghs[3];
581 struct gfs2_rgrpd *rgd;
582 struct gfs2_holder ri_gh;
583 int error;
584
585 error = gfs2_rindex_hold(sdp, &ri_gh);
586 if (error)
587 return error;
588 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
589 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
590
591 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
592 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
593
594 error = gfs2_glock_nq(ghs); /* parent */
595 if (error)
596 goto out_parent;
597
598 error = gfs2_glock_nq(ghs + 1); /* child */
599 if (error)
600 goto out_child;
601
602 error = gfs2_glock_nq(ghs + 2); /* rgrp */
603 if (error)
604 goto out_rgrp;
605
606 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
607 if (error)
608 goto out_gunlock;
609
610 if (ip->i_entries < 2) {
611 if (gfs2_consist_inode(ip))
612 gfs2_dinode_print(ip);
613 error = -EIO;
614 goto out_gunlock;
615 }
616 if (ip->i_entries > 2) {
617 error = -ENOTEMPTY;
618 goto out_gunlock;
619 }
620
621 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
622 if (error)
623 goto out_gunlock;
624
625 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
626
627 gfs2_trans_end(sdp);
628
629 out_gunlock:
630 gfs2_glock_dq(ghs + 2);
631 out_rgrp:
632 gfs2_holder_uninit(ghs + 2);
633 gfs2_glock_dq(ghs + 1);
634 out_child:
635 gfs2_holder_uninit(ghs + 1);
636 gfs2_glock_dq(ghs);
637 out_parent:
638 gfs2_holder_uninit(ghs);
639 gfs2_glock_dq_uninit(&ri_gh);
640 return error;
641 }
642
643 /**
644 * gfs2_mknod - Make a special file
645 * @dir: The directory in which the special file will reside
646 * @dentry: The dentry of the special file
647 * @mode: The mode of the special file
648 * @rdev: The device specification of the special file
649 *
650 */
651
652 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
653 dev_t dev)
654 {
655 struct gfs2_inode *dip = GFS2_I(dir);
656 struct gfs2_sbd *sdp = GFS2_SB(dir);
657 struct gfs2_holder ghs[2];
658 struct inode *inode;
659
660 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
661
662 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
663 if (IS_ERR(inode)) {
664 gfs2_holder_uninit(ghs);
665 return PTR_ERR(inode);
666 }
667
668 gfs2_trans_end(sdp);
669 if (dip->i_alloc->al_rgd)
670 gfs2_inplace_release(dip);
671 gfs2_quota_unlock(dip);
672 gfs2_alloc_put(dip);
673
674 gfs2_glock_dq_uninit_m(2, ghs);
675
676 d_instantiate(dentry, inode);
677 mark_inode_dirty(inode);
678
679 return 0;
680 }
681
682 /*
683 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
684 * @this: move this
685 * @to: to here
686 *
687 * Follow @to back to the root and make sure we don't encounter @this
688 * Assumes we already hold the rename lock.
689 *
690 * Returns: errno
691 */
692
693 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
694 {
695 struct inode *dir = &to->i_inode;
696 struct super_block *sb = dir->i_sb;
697 struct inode *tmp;
698 struct qstr dotdot;
699 int error = 0;
700
701 gfs2_str2qstr(&dotdot, "..");
702
703 igrab(dir);
704
705 for (;;) {
706 if (dir == &this->i_inode) {
707 error = -EINVAL;
708 break;
709 }
710 if (dir == sb->s_root->d_inode) {
711 error = 0;
712 break;
713 }
714
715 tmp = gfs2_lookupi(dir, &dotdot, 1);
716 if (IS_ERR(tmp)) {
717 error = PTR_ERR(tmp);
718 break;
719 }
720
721 iput(dir);
722 dir = tmp;
723 }
724
725 iput(dir);
726
727 return error;
728 }
729
730 /**
731 * gfs2_rename - Rename a file
732 * @odir: Parent directory of old file name
733 * @odentry: The old dentry of the file
734 * @ndir: Parent directory of new file name
735 * @ndentry: The new dentry of the file
736 *
737 * Returns: errno
738 */
739
740 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
741 struct inode *ndir, struct dentry *ndentry)
742 {
743 struct gfs2_inode *odip = GFS2_I(odir);
744 struct gfs2_inode *ndip = GFS2_I(ndir);
745 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
746 struct gfs2_inode *nip = NULL;
747 struct gfs2_sbd *sdp = GFS2_SB(odir);
748 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
749 struct gfs2_rgrpd *nrgd;
750 unsigned int num_gh;
751 int dir_rename = 0;
752 int alloc_required;
753 unsigned int x;
754 int error;
755
756 if (ndentry->d_inode) {
757 nip = GFS2_I(ndentry->d_inode);
758 if (ip == nip)
759 return 0;
760 }
761
762
763 if (odip != ndip) {
764 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
765 0, &r_gh);
766 if (error)
767 goto out;
768
769 if (S_ISDIR(ip->i_inode.i_mode)) {
770 dir_rename = 1;
771 /* don't move a dirctory into it's subdir */
772 error = gfs2_ok_to_move(ip, ndip);
773 if (error)
774 goto out_gunlock_r;
775 }
776 }
777
778 num_gh = 1;
779 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
780 if (odip != ndip) {
781 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
782 num_gh++;
783 }
784 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
785 num_gh++;
786
787 if (nip) {
788 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
789 num_gh++;
790 /* grab the resource lock for unlink flag twiddling
791 * this is the case of the target file already existing
792 * so we unlink before doing the rename
793 */
794 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
795 if (nrgd)
796 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
797 }
798
799 for (x = 0; x < num_gh; x++) {
800 error = gfs2_glock_nq(ghs + x);
801 if (error)
802 goto out_gunlock;
803 }
804
805 /* Check out the old directory */
806
807 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
808 if (error)
809 goto out_gunlock;
810
811 /* Check out the new directory */
812
813 if (nip) {
814 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
815 if (error)
816 goto out_gunlock;
817
818 if (S_ISDIR(nip->i_inode.i_mode)) {
819 if (nip->i_entries < 2) {
820 if (gfs2_consist_inode(nip))
821 gfs2_dinode_print(nip);
822 error = -EIO;
823 goto out_gunlock;
824 }
825 if (nip->i_entries > 2) {
826 error = -ENOTEMPTY;
827 goto out_gunlock;
828 }
829 }
830 } else {
831 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
832 if (error)
833 goto out_gunlock;
834
835 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
836 switch (error) {
837 case -ENOENT:
838 error = 0;
839 break;
840 case 0:
841 error = -EEXIST;
842 default:
843 goto out_gunlock;
844 };
845
846 if (odip != ndip) {
847 if (!ndip->i_inode.i_nlink) {
848 error = -EINVAL;
849 goto out_gunlock;
850 }
851 if (ndip->i_entries == (u32)-1) {
852 error = -EFBIG;
853 goto out_gunlock;
854 }
855 if (S_ISDIR(ip->i_inode.i_mode) &&
856 ndip->i_inode.i_nlink == (u32)-1) {
857 error = -EMLINK;
858 goto out_gunlock;
859 }
860 }
861 }
862
863 /* Check out the dir to be renamed */
864
865 if (dir_rename) {
866 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
867 if (error)
868 goto out_gunlock;
869 }
870
871 alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
872 if (error < 0)
873 goto out_gunlock;
874 error = 0;
875
876 if (alloc_required) {
877 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
878 if (!al) {
879 error = -ENOMEM;
880 goto out_gunlock;
881 }
882
883 error = gfs2_quota_lock_check(ndip);
884 if (error)
885 goto out_alloc;
886
887 al->al_requested = sdp->sd_max_dirres;
888
889 error = gfs2_inplace_reserve(ndip);
890 if (error)
891 goto out_gunlock_q;
892
893 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
894 al->al_rgd->rd_length +
895 4 * RES_DINODE + 4 * RES_LEAF +
896 RES_STATFS + RES_QUOTA + 4, 0);
897 if (error)
898 goto out_ipreserv;
899 } else {
900 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
901 5 * RES_LEAF + 4, 0);
902 if (error)
903 goto out_gunlock;
904 }
905
906 /* Remove the target file, if it exists */
907
908 if (nip) {
909 if (S_ISDIR(nip->i_inode.i_mode))
910 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
911 else {
912 error = gfs2_dir_del(ndip, &ndentry->d_name);
913 if (error)
914 goto out_end_trans;
915 error = gfs2_change_nlink(nip, -1);
916 }
917 if (error)
918 goto out_end_trans;
919 }
920
921 if (dir_rename) {
922 struct qstr name;
923 gfs2_str2qstr(&name, "..");
924
925 error = gfs2_change_nlink(ndip, +1);
926 if (error)
927 goto out_end_trans;
928 error = gfs2_change_nlink(odip, -1);
929 if (error)
930 goto out_end_trans;
931
932 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
933 if (error)
934 goto out_end_trans;
935 } else {
936 struct buffer_head *dibh;
937 error = gfs2_meta_inode_buffer(ip, &dibh);
938 if (error)
939 goto out_end_trans;
940 ip->i_inode.i_ctime = CURRENT_TIME;
941 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
942 gfs2_dinode_out(ip, dibh->b_data);
943 brelse(dibh);
944 }
945
946 error = gfs2_dir_del(odip, &odentry->d_name);
947 if (error)
948 goto out_end_trans;
949
950 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
951 if (error)
952 goto out_end_trans;
953
954 out_end_trans:
955 gfs2_trans_end(sdp);
956 out_ipreserv:
957 if (alloc_required)
958 gfs2_inplace_release(ndip);
959 out_gunlock_q:
960 if (alloc_required)
961 gfs2_quota_unlock(ndip);
962 out_alloc:
963 if (alloc_required)
964 gfs2_alloc_put(ndip);
965 out_gunlock:
966 while (x--) {
967 gfs2_glock_dq(ghs + x);
968 gfs2_holder_uninit(ghs + x);
969 }
970 out_gunlock_r:
971 if (r_gh.gh_gl)
972 gfs2_glock_dq_uninit(&r_gh);
973 out:
974 return error;
975 }
976
977 /**
978 * gfs2_readlinki - return the contents of a symlink
979 * @ip: the symlink's inode
980 * @buf: a pointer to the buffer to be filled
981 * @len: a pointer to the length of @buf
982 *
983 * If @buf is too small, a piece of memory is kmalloc()ed and needs
984 * to be freed by the caller.
985 *
986 * Returns: errno
987 */
988
989 static int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
990 {
991 struct gfs2_holder i_gh;
992 struct buffer_head *dibh;
993 unsigned int x;
994 int error;
995
996 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
997 error = gfs2_glock_nq(&i_gh);
998 if (error) {
999 gfs2_holder_uninit(&i_gh);
1000 return error;
1001 }
1002
1003 if (!ip->i_disksize) {
1004 gfs2_consist_inode(ip);
1005 error = -EIO;
1006 goto out;
1007 }
1008
1009 error = gfs2_meta_inode_buffer(ip, &dibh);
1010 if (error)
1011 goto out;
1012
1013 x = ip->i_disksize + 1;
1014 if (x > *len) {
1015 *buf = kmalloc(x, GFP_NOFS);
1016 if (!*buf) {
1017 error = -ENOMEM;
1018 goto out_brelse;
1019 }
1020 }
1021
1022 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1023 *len = x;
1024
1025 out_brelse:
1026 brelse(dibh);
1027 out:
1028 gfs2_glock_dq_uninit(&i_gh);
1029 return error;
1030 }
1031
1032 /**
1033 * gfs2_readlink - Read the value of a symlink
1034 * @dentry: the symlink
1035 * @buf: the buffer to read the symlink data into
1036 * @size: the size of the buffer
1037 *
1038 * Returns: errno
1039 */
1040
1041 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
1042 int user_size)
1043 {
1044 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1045 char array[GFS2_FAST_NAME_SIZE], *buf = array;
1046 unsigned int len = GFS2_FAST_NAME_SIZE;
1047 int error;
1048
1049 error = gfs2_readlinki(ip, &buf, &len);
1050 if (error)
1051 return error;
1052
1053 if (user_size > len - 1)
1054 user_size = len - 1;
1055
1056 if (copy_to_user(user_buf, buf, user_size))
1057 error = -EFAULT;
1058 else
1059 error = user_size;
1060
1061 if (buf != array)
1062 kfree(buf);
1063
1064 return error;
1065 }
1066
1067 /**
1068 * gfs2_follow_link - Follow a symbolic link
1069 * @dentry: The dentry of the link
1070 * @nd: Data that we pass to vfs_follow_link()
1071 *
1072 * This can handle symlinks of any size. It is optimised for symlinks
1073 * under GFS2_FAST_NAME_SIZE.
1074 *
1075 * Returns: 0 on success or error code
1076 */
1077
1078 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
1079 {
1080 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
1081 char array[GFS2_FAST_NAME_SIZE], *buf = array;
1082 unsigned int len = GFS2_FAST_NAME_SIZE;
1083 int error;
1084
1085 error = gfs2_readlinki(ip, &buf, &len);
1086 if (!error) {
1087 error = vfs_follow_link(nd, buf);
1088 if (buf != array)
1089 kfree(buf);
1090 }
1091
1092 return ERR_PTR(error);
1093 }
1094
1095 /**
1096 * gfs2_permission -
1097 * @inode:
1098 * @mask:
1099 * @nd: passed from Linux VFS, ignored by us
1100 *
1101 * This may be called from the VFS directly, or from within GFS2 with the
1102 * inode locked, so we look to see if the glock is already locked and only
1103 * lock the glock if its not already been done.
1104 *
1105 * Returns: errno
1106 */
1107
1108 int gfs2_permission(struct inode *inode, int mask)
1109 {
1110 struct gfs2_inode *ip = GFS2_I(inode);
1111 struct gfs2_holder i_gh;
1112 int error;
1113 int unlock = 0;
1114
1115 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1116 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1117 if (error)
1118 return error;
1119 unlock = 1;
1120 }
1121
1122 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1123 error = -EACCES;
1124 else
1125 error = generic_permission(inode, mask, gfs2_check_acl);
1126 if (unlock)
1127 gfs2_glock_dq_uninit(&i_gh);
1128
1129 return error;
1130 }
1131
1132 static int setattr_size(struct inode *inode, struct iattr *attr)
1133 {
1134 struct gfs2_inode *ip = GFS2_I(inode);
1135 struct gfs2_sbd *sdp = GFS2_SB(inode);
1136 int error;
1137
1138 if (attr->ia_size != ip->i_disksize) {
1139 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1140 if (error)
1141 return error;
1142 error = vmtruncate(inode, attr->ia_size);
1143 gfs2_trans_end(sdp);
1144 if (error)
1145 return error;
1146 }
1147
1148 error = gfs2_truncatei(ip, attr->ia_size);
1149 if (error && (inode->i_size != ip->i_disksize))
1150 i_size_write(inode, ip->i_disksize);
1151
1152 return error;
1153 }
1154
1155 static int setattr_chown(struct inode *inode, struct iattr *attr)
1156 {
1157 struct gfs2_inode *ip = GFS2_I(inode);
1158 struct gfs2_sbd *sdp = GFS2_SB(inode);
1159 struct buffer_head *dibh;
1160 u32 ouid, ogid, nuid, ngid;
1161 int error;
1162
1163 ouid = inode->i_uid;
1164 ogid = inode->i_gid;
1165 nuid = attr->ia_uid;
1166 ngid = attr->ia_gid;
1167
1168 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1169 ouid = nuid = NO_QUOTA_CHANGE;
1170 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1171 ogid = ngid = NO_QUOTA_CHANGE;
1172
1173 if (!gfs2_alloc_get(ip))
1174 return -ENOMEM;
1175
1176 error = gfs2_quota_lock(ip, nuid, ngid);
1177 if (error)
1178 goto out_alloc;
1179
1180 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1181 error = gfs2_quota_check(ip, nuid, ngid);
1182 if (error)
1183 goto out_gunlock_q;
1184 }
1185
1186 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1187 if (error)
1188 goto out_gunlock_q;
1189
1190 error = gfs2_meta_inode_buffer(ip, &dibh);
1191 if (error)
1192 goto out_end_trans;
1193
1194 error = inode_setattr(inode, attr);
1195 gfs2_assert_warn(sdp, !error);
1196
1197 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1198 gfs2_dinode_out(ip, dibh->b_data);
1199 brelse(dibh);
1200
1201 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1202 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1203 gfs2_quota_change(ip, -blocks, ouid, ogid);
1204 gfs2_quota_change(ip, blocks, nuid, ngid);
1205 }
1206
1207 out_end_trans:
1208 gfs2_trans_end(sdp);
1209 out_gunlock_q:
1210 gfs2_quota_unlock(ip);
1211 out_alloc:
1212 gfs2_alloc_put(ip);
1213 return error;
1214 }
1215
1216 /**
1217 * gfs2_setattr - Change attributes on an inode
1218 * @dentry: The dentry which is changing
1219 * @attr: The structure describing the change
1220 *
1221 * The VFS layer wants to change one or more of an inodes attributes. Write
1222 * that change out to disk.
1223 *
1224 * Returns: errno
1225 */
1226
1227 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1228 {
1229 struct inode *inode = dentry->d_inode;
1230 struct gfs2_inode *ip = GFS2_I(inode);
1231 struct gfs2_holder i_gh;
1232 int error;
1233
1234 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1235 if (error)
1236 return error;
1237
1238 error = -EPERM;
1239 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1240 goto out;
1241
1242 error = inode_change_ok(inode, attr);
1243 if (error)
1244 goto out;
1245
1246 if (attr->ia_valid & ATTR_SIZE)
1247 error = setattr_size(inode, attr);
1248 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1249 error = setattr_chown(inode, attr);
1250 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1251 error = gfs2_acl_chmod(ip, attr);
1252 else
1253 error = gfs2_setattr_simple(ip, attr);
1254
1255 out:
1256 gfs2_glock_dq_uninit(&i_gh);
1257 if (!error)
1258 mark_inode_dirty(inode);
1259 return error;
1260 }
1261
1262 /**
1263 * gfs2_getattr - Read out an inode's attributes
1264 * @mnt: The vfsmount the inode is being accessed from
1265 * @dentry: The dentry to stat
1266 * @stat: The inode's stats
1267 *
1268 * This may be called from the VFS directly, or from within GFS2 with the
1269 * inode locked, so we look to see if the glock is already locked and only
1270 * lock the glock if its not already been done. Note that its the NFS
1271 * readdirplus operation which causes this to be called (from filldir)
1272 * with the glock already held.
1273 *
1274 * Returns: errno
1275 */
1276
1277 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1278 struct kstat *stat)
1279 {
1280 struct inode *inode = dentry->d_inode;
1281 struct gfs2_inode *ip = GFS2_I(inode);
1282 struct gfs2_holder gh;
1283 int error;
1284 int unlock = 0;
1285
1286 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1287 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1288 if (error)
1289 return error;
1290 unlock = 1;
1291 }
1292
1293 generic_fillattr(inode, stat);
1294 if (unlock)
1295 gfs2_glock_dq_uninit(&gh);
1296
1297 return 0;
1298 }
1299
1300 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1301 const void *data, size_t size, int flags)
1302 {
1303 struct inode *inode = dentry->d_inode;
1304 struct gfs2_inode *ip = GFS2_I(inode);
1305 struct gfs2_holder gh;
1306 int ret;
1307
1308 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1309 ret = gfs2_glock_nq(&gh);
1310 if (ret == 0) {
1311 ret = generic_setxattr(dentry, name, data, size, flags);
1312 gfs2_glock_dq(&gh);
1313 }
1314 gfs2_holder_uninit(&gh);
1315 return ret;
1316 }
1317
1318 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1319 void *data, size_t size)
1320 {
1321 struct inode *inode = dentry->d_inode;
1322 struct gfs2_inode *ip = GFS2_I(inode);
1323 struct gfs2_holder gh;
1324 int ret;
1325
1326 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1327 ret = gfs2_glock_nq(&gh);
1328 if (ret == 0) {
1329 ret = generic_getxattr(dentry, name, data, size);
1330 gfs2_glock_dq(&gh);
1331 }
1332 gfs2_holder_uninit(&gh);
1333 return ret;
1334 }
1335
1336 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1337 {
1338 struct inode *inode = dentry->d_inode;
1339 struct gfs2_inode *ip = GFS2_I(inode);
1340 struct gfs2_holder gh;
1341 int ret;
1342
1343 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1344 ret = gfs2_glock_nq(&gh);
1345 if (ret == 0) {
1346 ret = generic_removexattr(dentry, name);
1347 gfs2_glock_dq(&gh);
1348 }
1349 gfs2_holder_uninit(&gh);
1350 return ret;
1351 }
1352
1353 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1354 u64 start, u64 len)
1355 {
1356 struct gfs2_inode *ip = GFS2_I(inode);
1357 struct gfs2_holder gh;
1358 int ret;
1359
1360 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1361 if (ret)
1362 return ret;
1363
1364 mutex_lock(&inode->i_mutex);
1365
1366 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1367 if (ret)
1368 goto out;
1369
1370 if (gfs2_is_stuffed(ip)) {
1371 u64 phys = ip->i_no_addr << inode->i_blkbits;
1372 u64 size = i_size_read(inode);
1373 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1374 FIEMAP_EXTENT_DATA_INLINE;
1375 phys += sizeof(struct gfs2_dinode);
1376 phys += start;
1377 if (start + len > size)
1378 len = size - start;
1379 if (start < size)
1380 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1381 len, flags);
1382 if (ret == 1)
1383 ret = 0;
1384 } else {
1385 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1386 gfs2_block_map);
1387 }
1388
1389 gfs2_glock_dq_uninit(&gh);
1390 out:
1391 mutex_unlock(&inode->i_mutex);
1392 return ret;
1393 }
1394
1395 const struct inode_operations gfs2_file_iops = {
1396 .permission = gfs2_permission,
1397 .setattr = gfs2_setattr,
1398 .getattr = gfs2_getattr,
1399 .setxattr = gfs2_setxattr,
1400 .getxattr = gfs2_getxattr,
1401 .listxattr = gfs2_listxattr,
1402 .removexattr = gfs2_removexattr,
1403 .fiemap = gfs2_fiemap,
1404 };
1405
1406 const struct inode_operations gfs2_dir_iops = {
1407 .create = gfs2_create,
1408 .lookup = gfs2_lookup,
1409 .link = gfs2_link,
1410 .unlink = gfs2_unlink,
1411 .symlink = gfs2_symlink,
1412 .mkdir = gfs2_mkdir,
1413 .rmdir = gfs2_rmdir,
1414 .mknod = gfs2_mknod,
1415 .rename = gfs2_rename,
1416 .permission = gfs2_permission,
1417 .setattr = gfs2_setattr,
1418 .getattr = gfs2_getattr,
1419 .setxattr = gfs2_setxattr,
1420 .getxattr = gfs2_getxattr,
1421 .listxattr = gfs2_listxattr,
1422 .removexattr = gfs2_removexattr,
1423 .fiemap = gfs2_fiemap,
1424 };
1425
1426 const struct inode_operations gfs2_symlink_iops = {
1427 .readlink = gfs2_readlink,
1428 .follow_link = gfs2_follow_link,
1429 .permission = gfs2_permission,
1430 .setattr = gfs2_setattr,
1431 .getattr = gfs2_getattr,
1432 .setxattr = gfs2_setxattr,
1433 .getxattr = gfs2_getxattr,
1434 .listxattr = gfs2_listxattr,
1435 .removexattr = gfs2_removexattr,
1436 .fiemap = gfs2_fiemap,
1437 };
1438
Support for the Chinese Samsung S3C2440 based development boards