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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / fs / gfs2 / ops_inode.c
blob09e436a507239c6f1ec4852d1b4b7c68dcdcfb59
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/mm.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <asm/uaccess.h>
22
23 #include "gfs2.h"
24 #include "incore.h"
25 #include "acl.h"
26 #include "bmap.h"
27 #include "dir.h"
28 #include "xattr.h"
29 #include "glock.h"
30 #include "inode.h"
31 #include "meta_io.h"
32 #include "quota.h"
33 #include "rgrp.h"
34 #include "trans.h"
35 #include "util.h"
36 #include "super.h"
37
38 /**
39 * gfs2_create - Create a file
40 * @dir: The directory in which to create the file
41 * @dentry: The dentry of the new file
42 * @mode: The mode of the new file
43 *
44 * Returns: errno
45 */
46
47 static int gfs2_create(struct inode *dir, struct dentry *dentry,
48 int mode, struct nameidata *nd)
49 {
50 struct gfs2_inode *dip = GFS2_I(dir);
51 struct gfs2_sbd *sdp = GFS2_SB(dir);
52 struct gfs2_holder ghs[2];
53 struct inode *inode;
54
55 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
56
57 for (;;) {
58 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
59 if (!IS_ERR(inode)) {
60 gfs2_trans_end(sdp);
61 if (dip->i_alloc->al_rgd)
62 gfs2_inplace_release(dip);
63 gfs2_quota_unlock(dip);
64 gfs2_alloc_put(dip);
65 gfs2_glock_dq_uninit_m(2, ghs);
66 mark_inode_dirty(inode);
67 break;
68 } else if (PTR_ERR(inode) != -EEXIST ||
69 (nd && nd->flags & LOOKUP_EXCL)) {
70 gfs2_holder_uninit(ghs);
71 return PTR_ERR(inode);
72 }
73
74 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
75 if (inode) {
76 if (!IS_ERR(inode)) {
77 gfs2_holder_uninit(ghs);
78 break;
79 } else {
80 gfs2_holder_uninit(ghs);
81 return PTR_ERR(inode);
82 }
83 }
84 }
85
86 d_instantiate(dentry, inode);
87
88 return 0;
89 }
90
91 /**
92 * gfs2_lookup - Look up a filename in a directory and return its inode
93 * @dir: The directory inode
94 * @dentry: The dentry of the new inode
95 * @nd: passed from Linux VFS, ignored by us
96 *
97 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
98 *
99 * Returns: errno
100 */
101
102 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
103 struct nameidata *nd)
104 {
105 struct inode *inode = NULL;
106
107 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
108 if (inode && IS_ERR(inode))
109 return ERR_CAST(inode);
110
111 if (inode) {
112 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
113 struct gfs2_holder gh;
114 int error;
115 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
116 if (error) {
117 iput(inode);
118 return ERR_PTR(error);
119 }
120 gfs2_glock_dq_uninit(&gh);
121 return d_splice_alias(inode, dentry);
122 }
123 d_add(dentry, inode);
124
125 return NULL;
126 }
127
128 /**
129 * gfs2_link - Link to a file
130 * @old_dentry: The inode to link
131 * @dir: Add link to this directory
132 * @dentry: The name of the link
133 *
134 * Link the inode in "old_dentry" into the directory "dir" with the
135 * name in "dentry".
136 *
137 * Returns: errno
138 */
139
140 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
141 struct dentry *dentry)
142 {
143 struct gfs2_inode *dip = GFS2_I(dir);
144 struct gfs2_sbd *sdp = GFS2_SB(dir);
145 struct inode *inode = old_dentry->d_inode;
146 struct gfs2_inode *ip = GFS2_I(inode);
147 struct gfs2_holder ghs[2];
148 int alloc_required;
149 int error;
150
151 if (S_ISDIR(inode->i_mode))
152 return -EPERM;
153
154 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
155 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
156
157 error = gfs2_glock_nq(ghs); /* parent */
158 if (error)
159 goto out_parent;
160
161 error = gfs2_glock_nq(ghs + 1); /* child */
162 if (error)
163 goto out_child;
164
165 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
166 if (error)
167 goto out_gunlock;
168
169 error = gfs2_dir_check(dir, &dentry->d_name, 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_inode.i_nlink)
181 goto out_gunlock;
182 error = -EFBIG;
183 if (dip->i_entries == (u32)-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_inode.i_nlink)
190 goto out_gunlock;
191 error = -EMLINK;
192 if (ip->i_inode.i_nlink == (u32)-1)
193 goto out_gunlock;
194
195 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
196 if (error < 0)
197 goto out_gunlock;
198 error = 0;
199
200 if (alloc_required) {
201 struct gfs2_alloc *al = gfs2_alloc_get(dip);
202 if (!al) {
203 error = -ENOMEM;
204 goto out_gunlock;
205 }
206
207 error = gfs2_quota_lock_check(dip);
208 if (error)
209 goto out_alloc;
210
211 al->al_requested = sdp->sd_max_dirres;
212
213 error = gfs2_inplace_reserve(dip);
214 if (error)
215 goto out_gunlock_q;
216
217 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
218 gfs2_rg_blocks(al) +
219 2 * RES_DINODE + RES_STATFS +
220 RES_QUOTA, 0);
221 if (error)
222 goto out_ipres;
223 } else {
224 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
225 if (error)
226 goto out_ipres;
227 }
228
229 error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
230 if (error)
231 goto out_end_trans;
232
233 error = gfs2_change_nlink(ip, +1);
234
235 out_end_trans:
236 gfs2_trans_end(sdp);
237 out_ipres:
238 if (alloc_required)
239 gfs2_inplace_release(dip);
240 out_gunlock_q:
241 if (alloc_required)
242 gfs2_quota_unlock(dip);
243 out_alloc:
244 if (alloc_required)
245 gfs2_alloc_put(dip);
246 out_gunlock:
247 gfs2_glock_dq(ghs + 1);
248 out_child:
249 gfs2_glock_dq(ghs);
250 out_parent:
251 gfs2_holder_uninit(ghs);
252 gfs2_holder_uninit(ghs + 1);
253 if (!error) {
254 ihold(inode);
255 d_instantiate(dentry, inode);
256 mark_inode_dirty(inode);
257 }
258 return error;
259 }
260
261 /*
262 * gfs2_unlink_ok - check to see that a inode is still in a directory
263 * @dip: the directory
264 * @name: the name of the file
265 * @ip: the inode
266 *
267 * Assumes that the lock on (at least) @dip is held.
268 *
269 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
270 */
271
272 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
273 const struct gfs2_inode *ip)
274 {
275 int error;
276
277 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
278 return -EPERM;
279
280 if ((dip->i_inode.i_mode & S_ISVTX) &&
281 dip->i_inode.i_uid != current_fsuid() &&
282 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
283 return -EPERM;
284
285 if (IS_APPEND(&dip->i_inode))
286 return -EPERM;
287
288 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
289 if (error)
290 return error;
291
292 error = gfs2_dir_check(&dip->i_inode, name, ip);
293 if (error)
294 return error;
295
296 return 0;
297 }
298
299 /**
300 * gfs2_unlink - Unlink a file
301 * @dir: The inode of the directory containing the file to unlink
302 * @dentry: The file itself
303 *
304 * Unlink a file. Call gfs2_unlinki()
305 *
306 * Returns: errno
307 */
308
309 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
310 {
311 struct gfs2_inode *dip = GFS2_I(dir);
312 struct gfs2_sbd *sdp = GFS2_SB(dir);
313 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
314 struct gfs2_holder ghs[3];
315 struct gfs2_rgrpd *rgd;
316 struct gfs2_holder ri_gh;
317 int error;
318
319 error = gfs2_rindex_hold(sdp, &ri_gh);
320 if (error)
321 return error;
322
323 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
324 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
325
326 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
327 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
328
329
330 error = gfs2_glock_nq(ghs); /* parent */
331 if (error)
332 goto out_parent;
333
334 error = gfs2_glock_nq(ghs + 1); /* child */
335 if (error)
336 goto out_child;
337
338 error = gfs2_glock_nq(ghs + 2); /* rgrp */
339 if (error)
340 goto out_rgrp;
341
342 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
343 if (error)
344 goto out_gunlock;
345
346 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
347 if (error)
348 goto out_gunlock;
349
350 error = gfs2_dir_del(dip, &dentry->d_name);
351 if (error)
352 goto out_end_trans;
353
354 error = gfs2_change_nlink(ip, -1);
355
356 out_end_trans:
357 gfs2_trans_end(sdp);
358 out_gunlock:
359 gfs2_glock_dq(ghs + 2);
360 out_rgrp:
361 gfs2_holder_uninit(ghs + 2);
362 gfs2_glock_dq(ghs + 1);
363 out_child:
364 gfs2_holder_uninit(ghs + 1);
365 gfs2_glock_dq(ghs);
366 out_parent:
367 gfs2_holder_uninit(ghs);
368 gfs2_glock_dq_uninit(&ri_gh);
369 return error;
370 }
371
372 /**
373 * gfs2_symlink - Create a symlink
374 * @dir: The directory to create the symlink in
375 * @dentry: The dentry to put the symlink in
376 * @symname: The thing which the link points to
377 *
378 * Returns: errno
379 */
380
381 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
382 const char *symname)
383 {
384 struct gfs2_inode *dip = GFS2_I(dir), *ip;
385 struct gfs2_sbd *sdp = GFS2_SB(dir);
386 struct gfs2_holder ghs[2];
387 struct inode *inode;
388 struct buffer_head *dibh;
389 int size;
390 int error;
391
392 /* Must be stuffed with a null terminator for gfs2_follow_link() */
393 size = strlen(symname);
394 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
395 return -ENAMETOOLONG;
396
397 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
398
399 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
400 if (IS_ERR(inode)) {
401 gfs2_holder_uninit(ghs);
402 return PTR_ERR(inode);
403 }
404
405 ip = ghs[1].gh_gl->gl_object;
406
407 i_size_write(inode, size);
408
409 error = gfs2_meta_inode_buffer(ip, &dibh);
410
411 if (!gfs2_assert_withdraw(sdp, !error)) {
412 gfs2_dinode_out(ip, dibh->b_data);
413 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
414 size);
415 brelse(dibh);
416 }
417
418 gfs2_trans_end(sdp);
419 if (dip->i_alloc->al_rgd)
420 gfs2_inplace_release(dip);
421 gfs2_quota_unlock(dip);
422 gfs2_alloc_put(dip);
423
424 gfs2_glock_dq_uninit_m(2, ghs);
425
426 d_instantiate(dentry, inode);
427 mark_inode_dirty(inode);
428
429 return 0;
430 }
431
432 /**
433 * gfs2_mkdir - Make a directory
434 * @dir: The parent directory of the new one
435 * @dentry: The dentry of the new directory
436 * @mode: The mode of the new directory
437 *
438 * Returns: errno
439 */
440
441 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
442 {
443 struct gfs2_inode *dip = GFS2_I(dir), *ip;
444 struct gfs2_sbd *sdp = GFS2_SB(dir);
445 struct gfs2_holder ghs[2];
446 struct inode *inode;
447 struct buffer_head *dibh;
448 int error;
449
450 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
451
452 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
453 if (IS_ERR(inode)) {
454 gfs2_holder_uninit(ghs);
455 return PTR_ERR(inode);
456 }
457
458 ip = ghs[1].gh_gl->gl_object;
459
460 ip->i_inode.i_nlink = 2;
461 i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
462 ip->i_diskflags |= GFS2_DIF_JDATA;
463 ip->i_entries = 2;
464
465 error = gfs2_meta_inode_buffer(ip, &dibh);
466
467 if (!gfs2_assert_withdraw(sdp, !error)) {
468 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
469 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
470
471 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
472 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
473 dent->de_inum = di->di_num; /* already GFS2 endian */
474 dent->de_type = cpu_to_be16(DT_DIR);
475 di->di_entries = cpu_to_be32(1);
476
477 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
478 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
479
480 gfs2_inum_out(dip, dent);
481 dent->de_type = cpu_to_be16(DT_DIR);
482
483 gfs2_dinode_out(ip, di);
484
485 brelse(dibh);
486 }
487
488 error = gfs2_change_nlink(dip, +1);
489 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
490
491 gfs2_trans_end(sdp);
492 if (dip->i_alloc->al_rgd)
493 gfs2_inplace_release(dip);
494 gfs2_quota_unlock(dip);
495 gfs2_alloc_put(dip);
496
497 gfs2_glock_dq_uninit_m(2, ghs);
498
499 d_instantiate(dentry, inode);
500 mark_inode_dirty(inode);
501
502 return 0;
503 }
504
505 /**
506 * gfs2_rmdiri - Remove a directory
507 * @dip: The parent directory of the directory to be removed
508 * @name: The name of the directory to be removed
509 * @ip: The GFS2 inode of the directory to be removed
510 *
511 * Assumes Glocks on dip and ip are held
512 *
513 * Returns: errno
514 */
515
516 static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
517 struct gfs2_inode *ip)
518 {
519 int error;
520
521 if (ip->i_entries != 2) {
522 if (gfs2_consist_inode(ip))
523 gfs2_dinode_print(ip);
524 return -EIO;
525 }
526
527 error = gfs2_dir_del(dip, name);
528 if (error)
529 return error;
530
531 error = gfs2_change_nlink(dip, -1);
532 if (error)
533 return error;
534
535 error = gfs2_dir_del(ip, &gfs2_qdot);
536 if (error)
537 return error;
538
539 error = gfs2_dir_del(ip, &gfs2_qdotdot);
540 if (error)
541 return error;
542
543 /* It looks odd, but it really should be done twice */
544 error = gfs2_change_nlink(ip, -1);
545 if (error)
546 return error;
547
548 error = gfs2_change_nlink(ip, -1);
549 if (error)
550 return error;
551
552 return error;
553 }
554
555 /**
556 * gfs2_rmdir - Remove a directory
557 * @dir: The parent directory of the directory to be removed
558 * @dentry: The dentry of the directory to remove
559 *
560 * Remove a directory. Call gfs2_rmdiri()
561 *
562 * Returns: errno
563 */
564
565 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
566 {
567 struct gfs2_inode *dip = GFS2_I(dir);
568 struct gfs2_sbd *sdp = GFS2_SB(dir);
569 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
570 struct gfs2_holder ghs[3];
571 struct gfs2_rgrpd *rgd;
572 struct gfs2_holder ri_gh;
573 int error;
574
575 error = gfs2_rindex_hold(sdp, &ri_gh);
576 if (error)
577 return error;
578 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
579 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
580
581 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
582 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
583
584 error = gfs2_glock_nq(ghs); /* parent */
585 if (error)
586 goto out_parent;
587
588 error = gfs2_glock_nq(ghs + 1); /* child */
589 if (error)
590 goto out_child;
591
592 error = gfs2_glock_nq(ghs + 2); /* rgrp */
593 if (error)
594 goto out_rgrp;
595
596 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
597 if (error)
598 goto out_gunlock;
599
600 if (ip->i_entries < 2) {
601 if (gfs2_consist_inode(ip))
602 gfs2_dinode_print(ip);
603 error = -EIO;
604 goto out_gunlock;
605 }
606 if (ip->i_entries > 2) {
607 error = -ENOTEMPTY;
608 goto out_gunlock;
609 }
610
611 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
612 if (error)
613 goto out_gunlock;
614
615 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
616
617 gfs2_trans_end(sdp);
618
619 out_gunlock:
620 gfs2_glock_dq(ghs + 2);
621 out_rgrp:
622 gfs2_holder_uninit(ghs + 2);
623 gfs2_glock_dq(ghs + 1);
624 out_child:
625 gfs2_holder_uninit(ghs + 1);
626 gfs2_glock_dq(ghs);
627 out_parent:
628 gfs2_holder_uninit(ghs);
629 gfs2_glock_dq_uninit(&ri_gh);
630 return error;
631 }
632
633 /**
634 * gfs2_mknod - Make a special file
635 * @dir: The directory in which the special file will reside
636 * @dentry: The dentry of the special file
637 * @mode: The mode of the special file
638 * @rdev: The device specification of the special file
639 *
640 */
641
642 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
643 dev_t dev)
644 {
645 struct gfs2_inode *dip = GFS2_I(dir);
646 struct gfs2_sbd *sdp = GFS2_SB(dir);
647 struct gfs2_holder ghs[2];
648 struct inode *inode;
649
650 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
651
652 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
653 if (IS_ERR(inode)) {
654 gfs2_holder_uninit(ghs);
655 return PTR_ERR(inode);
656 }
657
658 gfs2_trans_end(sdp);
659 if (dip->i_alloc->al_rgd)
660 gfs2_inplace_release(dip);
661 gfs2_quota_unlock(dip);
662 gfs2_alloc_put(dip);
663
664 gfs2_glock_dq_uninit_m(2, ghs);
665
666 d_instantiate(dentry, inode);
667 mark_inode_dirty(inode);
668
669 return 0;
670 }
671
672 /*
673 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
674 * @this: move this
675 * @to: to here
676 *
677 * Follow @to back to the root and make sure we don't encounter @this
678 * Assumes we already hold the rename lock.
679 *
680 * Returns: errno
681 */
682
683 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
684 {
685 struct inode *dir = &to->i_inode;
686 struct super_block *sb = dir->i_sb;
687 struct inode *tmp;
688 int error = 0;
689
690 igrab(dir);
691
692 for (;;) {
693 if (dir == &this->i_inode) {
694 error = -EINVAL;
695 break;
696 }
697 if (dir == sb->s_root->d_inode) {
698 error = 0;
699 break;
700 }
701
702 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
703 if (IS_ERR(tmp)) {
704 error = PTR_ERR(tmp);
705 break;
706 }
707
708 iput(dir);
709 dir = tmp;
710 }
711
712 iput(dir);
713
714 return error;
715 }
716
717 /**
718 * gfs2_rename - Rename a file
719 * @odir: Parent directory of old file name
720 * @odentry: The old dentry of the file
721 * @ndir: Parent directory of new file name
722 * @ndentry: The new dentry of the file
723 *
724 * Returns: errno
725 */
726
727 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
728 struct inode *ndir, struct dentry *ndentry)
729 {
730 struct gfs2_inode *odip = GFS2_I(odir);
731 struct gfs2_inode *ndip = GFS2_I(ndir);
732 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
733 struct gfs2_inode *nip = NULL;
734 struct gfs2_sbd *sdp = GFS2_SB(odir);
735 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
736 struct gfs2_rgrpd *nrgd;
737 unsigned int num_gh;
738 int dir_rename = 0;
739 int alloc_required = 0;
740 unsigned int x;
741 int error;
742
743 if (ndentry->d_inode) {
744 nip = GFS2_I(ndentry->d_inode);
745 if (ip == nip)
746 return 0;
747 }
748
749 error = gfs2_rindex_hold(sdp, &ri_gh);
750 if (error)
751 return error;
752
753 if (odip != ndip) {
754 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
755 0, &r_gh);
756 if (error)
757 goto out;
758
759 if (S_ISDIR(ip->i_inode.i_mode)) {
760 dir_rename = 1;
761 /* don't move a dirctory into it's subdir */
762 error = gfs2_ok_to_move(ip, ndip);
763 if (error)
764 goto out_gunlock_r;
765 }
766 }
767
768 num_gh = 1;
769 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
770 if (odip != ndip) {
771 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
772 num_gh++;
773 }
774 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
775 num_gh++;
776
777 if (nip) {
778 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
779 num_gh++;
780 /* grab the resource lock for unlink flag twiddling
781 * this is the case of the target file already existing
782 * so we unlink before doing the rename
783 */
784 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
785 if (nrgd)
786 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
787 }
788
789 for (x = 0; x < num_gh; x++) {
790 error = gfs2_glock_nq(ghs + x);
791 if (error)
792 goto out_gunlock;
793 }
794
795 /* Check out the old directory */
796
797 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
798 if (error)
799 goto out_gunlock;
800
801 /* Check out the new directory */
802
803 if (nip) {
804 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
805 if (error)
806 goto out_gunlock;
807
808 if (S_ISDIR(nip->i_inode.i_mode)) {
809 if (nip->i_entries < 2) {
810 if (gfs2_consist_inode(nip))
811 gfs2_dinode_print(nip);
812 error = -EIO;
813 goto out_gunlock;
814 }
815 if (nip->i_entries > 2) {
816 error = -ENOTEMPTY;
817 goto out_gunlock;
818 }
819 }
820 } else {
821 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0);
822 if (error)
823 goto out_gunlock;
824
825 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
826 switch (error) {
827 case -ENOENT:
828 error = 0;
829 break;
830 case 0:
831 error = -EEXIST;
832 default:
833 goto out_gunlock;
834 };
835
836 if (odip != ndip) {
837 if (!ndip->i_inode.i_nlink) {
838 error = -EINVAL;
839 goto out_gunlock;
840 }
841 if (ndip->i_entries == (u32)-1) {
842 error = -EFBIG;
843 goto out_gunlock;
844 }
845 if (S_ISDIR(ip->i_inode.i_mode) &&
846 ndip->i_inode.i_nlink == (u32)-1) {
847 error = -EMLINK;
848 goto out_gunlock;
849 }
850 }
851 }
852
853 /* Check out the dir to be renamed */
854
855 if (dir_rename) {
856 error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0);
857 if (error)
858 goto out_gunlock;
859 }
860
861 if (nip == NULL)
862 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
863 error = alloc_required;
864 if (error < 0)
865 goto out_gunlock;
866 error = 0;
867
868 if (alloc_required) {
869 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
870 if (!al) {
871 error = -ENOMEM;
872 goto out_gunlock;
873 }
874
875 error = gfs2_quota_lock_check(ndip);
876 if (error)
877 goto out_alloc;
878
879 al->al_requested = sdp->sd_max_dirres;
880
881 error = gfs2_inplace_reserve_ri(ndip);
882 if (error)
883 goto out_gunlock_q;
884
885 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
886 gfs2_rg_blocks(al) +
887 4 * RES_DINODE + 4 * RES_LEAF +
888 RES_STATFS + RES_QUOTA + 4, 0);
889 if (error)
890 goto out_ipreserv;
891 } else {
892 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
893 5 * RES_LEAF + 4, 0);
894 if (error)
895 goto out_gunlock;
896 }
897
898 /* Remove the target file, if it exists */
899
900 if (nip) {
901 if (S_ISDIR(nip->i_inode.i_mode))
902 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
903 else {
904 error = gfs2_dir_del(ndip, &ndentry->d_name);
905 if (error)
906 goto out_end_trans;
907 error = gfs2_change_nlink(nip, -1);
908 }
909 if (error)
910 goto out_end_trans;
911 }
912
913 if (dir_rename) {
914 error = gfs2_change_nlink(ndip, +1);
915 if (error)
916 goto out_end_trans;
917 error = gfs2_change_nlink(odip, -1);
918 if (error)
919 goto out_end_trans;
920
921 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
922 if (error)
923 goto out_end_trans;
924 } else {
925 struct buffer_head *dibh;
926 error = gfs2_meta_inode_buffer(ip, &dibh);
927 if (error)
928 goto out_end_trans;
929 ip->i_inode.i_ctime = CURRENT_TIME;
930 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
931 gfs2_dinode_out(ip, dibh->b_data);
932 brelse(dibh);
933 }
934
935 error = gfs2_dir_del(odip, &odentry->d_name);
936 if (error)
937 goto out_end_trans;
938
939 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
940 if (error)
941 goto out_end_trans;
942
943 out_end_trans:
944 gfs2_trans_end(sdp);
945 out_ipreserv:
946 if (alloc_required)
947 gfs2_inplace_release(ndip);
948 out_gunlock_q:
949 if (alloc_required)
950 gfs2_quota_unlock(ndip);
951 out_alloc:
952 if (alloc_required)
953 gfs2_alloc_put(ndip);
954 out_gunlock:
955 while (x--) {
956 gfs2_glock_dq(ghs + x);
957 gfs2_holder_uninit(ghs + x);
958 }
959 out_gunlock_r:
960 if (r_gh.gh_gl)
961 gfs2_glock_dq_uninit(&r_gh);
962 out:
963 gfs2_glock_dq_uninit(&ri_gh);
964 return error;
965 }
966
967 /**
968 * gfs2_follow_link - Follow a symbolic link
969 * @dentry: The dentry of the link
970 * @nd: Data that we pass to vfs_follow_link()
971 *
972 * This can handle symlinks of any size.
973 *
974 * Returns: 0 on success or error code
975 */
976
977 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
978 {
979 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
980 struct gfs2_holder i_gh;
981 struct buffer_head *dibh;
982 unsigned int x, size;
983 char *buf;
984 int error;
985
986 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
987 error = gfs2_glock_nq(&i_gh);
988 if (error) {
989 gfs2_holder_uninit(&i_gh);
990 nd_set_link(nd, ERR_PTR(error));
991 return NULL;
992 }
993
994 size = (unsigned int)i_size_read(&ip->i_inode);
995 if (size == 0) {
996 gfs2_consist_inode(ip);
997 buf = ERR_PTR(-EIO);
998 goto out;
999 }
1000
1001 error = gfs2_meta_inode_buffer(ip, &dibh);
1002 if (error) {
1003 buf = ERR_PTR(error);
1004 goto out;
1005 }
1006
1007 x = size + 1;
1008 buf = kmalloc(x, GFP_NOFS);
1009 if (!buf)
1010 buf = ERR_PTR(-ENOMEM);
1011 else
1012 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1013 brelse(dibh);
1014 out:
1015 gfs2_glock_dq_uninit(&i_gh);
1016 nd_set_link(nd, buf);
1017 return NULL;
1018 }
1019
1020 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1021 {
1022 char *s = nd_get_link(nd);
1023 if (!IS_ERR(s))
1024 kfree(s);
1025 }
1026
1027 /**
1028 * gfs2_permission -
1029 * @inode: The inode
1030 * @mask: The mask to be tested
1031 * @flags: Indicates whether this is an RCU path walk or not
1032 *
1033 * This may be called from the VFS directly, or from within GFS2 with the
1034 * inode locked, so we look to see if the glock is already locked and only
1035 * lock the glock if its not already been done.
1036 *
1037 * Returns: errno
1038 */
1039
1040 int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
1041 {
1042 struct gfs2_inode *ip;
1043 struct gfs2_holder i_gh;
1044 int error;
1045 int unlock = 0;
1046
1047
1048 ip = GFS2_I(inode);
1049 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1050 if (flags & IPERM_FLAG_RCU)
1051 return -ECHILD;
1052 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1053 if (error)
1054 return error;
1055 unlock = 1;
1056 }
1057
1058 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1059 error = -EACCES;
1060 else
1061 error = generic_permission(inode, mask, flags, gfs2_check_acl);
1062 if (unlock)
1063 gfs2_glock_dq_uninit(&i_gh);
1064
1065 return error;
1066 }
1067
1068 static int setattr_chown(struct inode *inode, struct iattr *attr)
1069 {
1070 struct gfs2_inode *ip = GFS2_I(inode);
1071 struct gfs2_sbd *sdp = GFS2_SB(inode);
1072 u32 ouid, ogid, nuid, ngid;
1073 int error;
1074
1075 ouid = inode->i_uid;
1076 ogid = inode->i_gid;
1077 nuid = attr->ia_uid;
1078 ngid = attr->ia_gid;
1079
1080 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1081 ouid = nuid = NO_QUOTA_CHANGE;
1082 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1083 ogid = ngid = NO_QUOTA_CHANGE;
1084
1085 if (!gfs2_alloc_get(ip))
1086 return -ENOMEM;
1087
1088 error = gfs2_quota_lock(ip, nuid, ngid);
1089 if (error)
1090 goto out_alloc;
1091
1092 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1093 error = gfs2_quota_check(ip, nuid, ngid);
1094 if (error)
1095 goto out_gunlock_q;
1096 }
1097
1098 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1099 if (error)
1100 goto out_gunlock_q;
1101
1102 error = gfs2_setattr_simple(ip, attr);
1103 if (error)
1104 goto out_end_trans;
1105
1106 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1107 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1108 gfs2_quota_change(ip, -blocks, ouid, ogid);
1109 gfs2_quota_change(ip, blocks, nuid, ngid);
1110 }
1111
1112 out_end_trans:
1113 gfs2_trans_end(sdp);
1114 out_gunlock_q:
1115 gfs2_quota_unlock(ip);
1116 out_alloc:
1117 gfs2_alloc_put(ip);
1118 return error;
1119 }
1120
1121 /**
1122 * gfs2_setattr - Change attributes on an inode
1123 * @dentry: The dentry which is changing
1124 * @attr: The structure describing the change
1125 *
1126 * The VFS layer wants to change one or more of an inodes attributes. Write
1127 * that change out to disk.
1128 *
1129 * Returns: errno
1130 */
1131
1132 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1133 {
1134 struct inode *inode = dentry->d_inode;
1135 struct gfs2_inode *ip = GFS2_I(inode);
1136 struct gfs2_holder i_gh;
1137 int error;
1138
1139 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1140 if (error)
1141 return error;
1142
1143 error = -EPERM;
1144 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1145 goto out;
1146
1147 error = inode_change_ok(inode, attr);
1148 if (error)
1149 goto out;
1150
1151 if (attr->ia_valid & ATTR_SIZE)
1152 error = gfs2_setattr_size(inode, attr->ia_size);
1153 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1154 error = setattr_chown(inode, attr);
1155 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1156 error = gfs2_acl_chmod(ip, attr);
1157 else
1158 error = gfs2_setattr_simple(ip, attr);
1159
1160 out:
1161 gfs2_glock_dq_uninit(&i_gh);
1162 if (!error)
1163 mark_inode_dirty(inode);
1164 return error;
1165 }
1166
1167 /**
1168 * gfs2_getattr - Read out an inode's attributes
1169 * @mnt: The vfsmount the inode is being accessed from
1170 * @dentry: The dentry to stat
1171 * @stat: The inode's stats
1172 *
1173 * This may be called from the VFS directly, or from within GFS2 with the
1174 * inode locked, so we look to see if the glock is already locked and only
1175 * lock the glock if its not already been done. Note that its the NFS
1176 * readdirplus operation which causes this to be called (from filldir)
1177 * with the glock already held.
1178 *
1179 * Returns: errno
1180 */
1181
1182 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1183 struct kstat *stat)
1184 {
1185 struct inode *inode = dentry->d_inode;
1186 struct gfs2_inode *ip = GFS2_I(inode);
1187 struct gfs2_holder gh;
1188 int error;
1189 int unlock = 0;
1190
1191 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1192 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1193 if (error)
1194 return error;
1195 unlock = 1;
1196 }
1197
1198 generic_fillattr(inode, stat);
1199 if (unlock)
1200 gfs2_glock_dq_uninit(&gh);
1201
1202 return 0;
1203 }
1204
1205 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1206 const void *data, size_t size, int flags)
1207 {
1208 struct inode *inode = dentry->d_inode;
1209 struct gfs2_inode *ip = GFS2_I(inode);
1210 struct gfs2_holder gh;
1211 int ret;
1212
1213 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1214 ret = gfs2_glock_nq(&gh);
1215 if (ret == 0) {
1216 ret = generic_setxattr(dentry, name, data, size, flags);
1217 gfs2_glock_dq(&gh);
1218 }
1219 gfs2_holder_uninit(&gh);
1220 return ret;
1221 }
1222
1223 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1224 void *data, size_t size)
1225 {
1226 struct inode *inode = dentry->d_inode;
1227 struct gfs2_inode *ip = GFS2_I(inode);
1228 struct gfs2_holder gh;
1229 int ret;
1230
1231 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1232 ret = gfs2_glock_nq(&gh);
1233 if (ret == 0) {
1234 ret = generic_getxattr(dentry, name, data, size);
1235 gfs2_glock_dq(&gh);
1236 }
1237 gfs2_holder_uninit(&gh);
1238 return ret;
1239 }
1240
1241 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1242 {
1243 struct inode *inode = dentry->d_inode;
1244 struct gfs2_inode *ip = GFS2_I(inode);
1245 struct gfs2_holder gh;
1246 int ret;
1247
1248 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1249 ret = gfs2_glock_nq(&gh);
1250 if (ret == 0) {
1251 ret = generic_removexattr(dentry, name);
1252 gfs2_glock_dq(&gh);
1253 }
1254 gfs2_holder_uninit(&gh);
1255 return ret;
1256 }
1257
1258 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1259 u64 start, u64 len)
1260 {
1261 struct gfs2_inode *ip = GFS2_I(inode);
1262 struct gfs2_holder gh;
1263 int ret;
1264
1265 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1266 if (ret)
1267 return ret;
1268
1269 mutex_lock(&inode->i_mutex);
1270
1271 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1272 if (ret)
1273 goto out;
1274
1275 if (gfs2_is_stuffed(ip)) {
1276 u64 phys = ip->i_no_addr << inode->i_blkbits;
1277 u64 size = i_size_read(inode);
1278 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1279 FIEMAP_EXTENT_DATA_INLINE;
1280 phys += sizeof(struct gfs2_dinode);
1281 phys += start;
1282 if (start + len > size)
1283 len = size - start;
1284 if (start < size)
1285 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1286 len, flags);
1287 if (ret == 1)
1288 ret = 0;
1289 } else {
1290 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1291 gfs2_block_map);
1292 }
1293
1294 gfs2_glock_dq_uninit(&gh);
1295 out:
1296 mutex_unlock(&inode->i_mutex);
1297 return ret;
1298 }
1299
1300 const struct inode_operations gfs2_file_iops = {
1301 .permission = gfs2_permission,
1302 .setattr = gfs2_setattr,
1303 .getattr = gfs2_getattr,
1304 .setxattr = gfs2_setxattr,
1305 .getxattr = gfs2_getxattr,
1306 .listxattr = gfs2_listxattr,
1307 .removexattr = gfs2_removexattr,
1308 .fiemap = gfs2_fiemap,
1309 };
1310
1311 const struct inode_operations gfs2_dir_iops = {
1312 .create = gfs2_create,
1313 .lookup = gfs2_lookup,
1314 .link = gfs2_link,
1315 .unlink = gfs2_unlink,
1316 .symlink = gfs2_symlink,
1317 .mkdir = gfs2_mkdir,
1318 .rmdir = gfs2_rmdir,
1319 .mknod = gfs2_mknod,
1320 .rename = gfs2_rename,
1321 .permission = gfs2_permission,
1322 .setattr = gfs2_setattr,
1323 .getattr = gfs2_getattr,
1324 .setxattr = gfs2_setxattr,
1325 .getxattr = gfs2_getxattr,
1326 .listxattr = gfs2_listxattr,
1327 .removexattr = gfs2_removexattr,
1328 .fiemap = gfs2_fiemap,
1329 };
1330
1331 const struct inode_operations gfs2_symlink_iops = {
1332 .readlink = generic_readlink,
1333 .follow_link = gfs2_follow_link,
1334 .put_link = gfs2_put_link,
1335 .permission = gfs2_permission,
1336 .setattr = gfs2_setattr,
1337 .getattr = gfs2_getattr,
1338 .setxattr = gfs2_setxattr,
1339 .getxattr = gfs2_getxattr,
1340 .listxattr = gfs2_listxattr,
1341 .removexattr = gfs2_removexattr,
1342 .fiemap = gfs2_fiemap,
1343 };
1344
CRIS linux kernel tree