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knfsd: nfsv4 delegation recall should take reference on client
[wrt350n-kernel.git] / fs / gfs2 / ops_inode.c
blob911c115b5c6c29ecf16aabe087c2be507bb58f71
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/lm_interface.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 "eaops.h"
30 #include "eattr.h"
31 #include "glock.h"
32 #include "inode.h"
33 #include "meta_io.h"
34 #include "ops_dentry.h"
35 #include "ops_inode.h"
36 #include "quota.h"
37 #include "rgrp.h"
38 #include "trans.h"
39 #include "util.h"
40
41 /**
42 * gfs2_create - Create a file
43 * @dir: The directory in which to create the file
44 * @dentry: The dentry of the new file
45 * @mode: The mode of the new file
46 *
47 * Returns: errno
48 */
49
50 static int gfs2_create(struct inode *dir, struct dentry *dentry,
51 int mode, struct nameidata *nd)
52 {
53 struct gfs2_inode *dip = GFS2_I(dir);
54 struct gfs2_sbd *sdp = GFS2_SB(dir);
55 struct gfs2_holder ghs[2];
56 struct inode *inode;
57
58 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
59
60 for (;;) {
61 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
62 if (!IS_ERR(inode)) {
63 gfs2_trans_end(sdp);
64 if (dip->i_alloc.al_rgd)
65 gfs2_inplace_release(dip);
66 gfs2_quota_unlock(dip);
67 gfs2_alloc_put(dip);
68 gfs2_glock_dq_uninit_m(2, ghs);
69 mark_inode_dirty(inode);
70 break;
71 } else if (PTR_ERR(inode) != -EEXIST ||
72 (nd->intent.open.flags & O_EXCL)) {
73 gfs2_holder_uninit(ghs);
74 return PTR_ERR(inode);
75 }
76
77 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
78 if (inode) {
79 if (!IS_ERR(inode)) {
80 gfs2_holder_uninit(ghs);
81 break;
82 } else {
83 gfs2_holder_uninit(ghs);
84 return PTR_ERR(inode);
85 }
86 }
87 }
88
89 d_instantiate(dentry, inode);
90
91 return 0;
92 }
93
94 /**
95 * gfs2_lookup - Look up a filename in a directory and return its inode
96 * @dir: The directory inode
97 * @dentry: The dentry of the new inode
98 * @nd: passed from Linux VFS, ignored by us
99 *
100 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
101 *
102 * Returns: errno
103 */
104
105 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
106 struct nameidata *nd)
107 {
108 struct inode *inode = NULL;
109
110 dentry->d_op = &gfs2_dops;
111
112 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
113 if (inode && IS_ERR(inode))
114 return ERR_PTR(PTR_ERR(inode));
115
116 if (inode)
117 return d_splice_alias(inode, dentry);
118 d_add(dentry, inode);
119
120 return NULL;
121 }
122
123 /**
124 * gfs2_link - Link to a file
125 * @old_dentry: The inode to link
126 * @dir: Add link to this directory
127 * @dentry: The name of the link
128 *
129 * Link the inode in "old_dentry" into the directory "dir" with the
130 * name in "dentry".
131 *
132 * Returns: errno
133 */
134
135 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
136 struct dentry *dentry)
137 {
138 struct gfs2_inode *dip = GFS2_I(dir);
139 struct gfs2_sbd *sdp = GFS2_SB(dir);
140 struct inode *inode = old_dentry->d_inode;
141 struct gfs2_inode *ip = GFS2_I(inode);
142 struct gfs2_holder ghs[2];
143 int alloc_required;
144 int error;
145
146 if (S_ISDIR(inode->i_mode))
147 return -EPERM;
148
149 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
150 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
151
152 error = gfs2_glock_nq_m(2, ghs);
153 if (error)
154 goto out;
155
156 error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
157 if (error)
158 goto out_gunlock;
159
160 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
161 switch (error) {
162 case -ENOENT:
163 break;
164 case 0:
165 error = -EEXIST;
166 default:
167 goto out_gunlock;
168 }
169
170 error = -EINVAL;
171 if (!dip->i_inode.i_nlink)
172 goto out_gunlock;
173 error = -EFBIG;
174 if (dip->i_di.di_entries == (u32)-1)
175 goto out_gunlock;
176 error = -EPERM;
177 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
178 goto out_gunlock;
179 error = -EINVAL;
180 if (!ip->i_inode.i_nlink)
181 goto out_gunlock;
182 error = -EMLINK;
183 if (ip->i_inode.i_nlink == (u32)-1)
184 goto out_gunlock;
185
186 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
187 if (error < 0)
188 goto out_gunlock;
189 error = 0;
190
191 if (alloc_required) {
192 struct gfs2_alloc *al = gfs2_alloc_get(dip);
193
194 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
195 if (error)
196 goto out_alloc;
197
198 error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid);
199 if (error)
200 goto out_gunlock_q;
201
202 al->al_requested = sdp->sd_max_dirres;
203
204 error = gfs2_inplace_reserve(dip);
205 if (error)
206 goto out_gunlock_q;
207
208 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
209 al->al_rgd->rd_length +
210 2 * RES_DINODE + RES_STATFS +
211 RES_QUOTA, 0);
212 if (error)
213 goto out_ipres;
214 } else {
215 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
216 if (error)
217 goto out_ipres;
218 }
219
220 error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
221 if (error)
222 goto out_end_trans;
223
224 error = gfs2_change_nlink(ip, +1);
225
226 out_end_trans:
227 gfs2_trans_end(sdp);
228 out_ipres:
229 if (alloc_required)
230 gfs2_inplace_release(dip);
231 out_gunlock_q:
232 if (alloc_required)
233 gfs2_quota_unlock(dip);
234 out_alloc:
235 if (alloc_required)
236 gfs2_alloc_put(dip);
237 out_gunlock:
238 gfs2_glock_dq_m(2, ghs);
239 out:
240 gfs2_holder_uninit(ghs);
241 gfs2_holder_uninit(ghs + 1);
242 if (!error) {
243 atomic_inc(&inode->i_count);
244 d_instantiate(dentry, inode);
245 mark_inode_dirty(inode);
246 }
247 return error;
248 }
249
250 /**
251 * gfs2_unlink - Unlink a file
252 * @dir: The inode of the directory containing the file to unlink
253 * @dentry: The file itself
254 *
255 * Unlink a file. Call gfs2_unlinki()
256 *
257 * Returns: errno
258 */
259
260 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
261 {
262 struct gfs2_inode *dip = GFS2_I(dir);
263 struct gfs2_sbd *sdp = GFS2_SB(dir);
264 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
265 struct gfs2_holder ghs[3];
266 struct gfs2_rgrpd *rgd;
267 struct gfs2_holder ri_gh;
268 int error;
269
270 error = gfs2_rindex_hold(sdp, &ri_gh);
271 if (error)
272 return error;
273
274 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
275 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
276
277 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
278 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
279
280
281 error = gfs2_glock_nq_m(3, ghs);
282 if (error)
283 goto out;
284
285 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
286 if (error)
287 goto out_gunlock;
288
289 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
290 if (error)
291 goto out_gunlock;
292
293 error = gfs2_dir_del(dip, &dentry->d_name);
294 if (error)
295 goto out_end_trans;
296
297 error = gfs2_change_nlink(ip, -1);
298
299 out_end_trans:
300 gfs2_trans_end(sdp);
301 out_gunlock:
302 gfs2_glock_dq_m(3, ghs);
303 out:
304 gfs2_holder_uninit(ghs);
305 gfs2_holder_uninit(ghs + 1);
306 gfs2_holder_uninit(ghs + 2);
307 gfs2_glock_dq_uninit(&ri_gh);
308 return error;
309 }
310
311 /**
312 * gfs2_symlink - Create a symlink
313 * @dir: The directory to create the symlink in
314 * @dentry: The dentry to put the symlink in
315 * @symname: The thing which the link points to
316 *
317 * Returns: errno
318 */
319
320 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
321 const char *symname)
322 {
323 struct gfs2_inode *dip = GFS2_I(dir), *ip;
324 struct gfs2_sbd *sdp = GFS2_SB(dir);
325 struct gfs2_holder ghs[2];
326 struct inode *inode;
327 struct buffer_head *dibh;
328 int size;
329 int error;
330
331 /* Must be stuffed with a null terminator for gfs2_follow_link() */
332 size = strlen(symname);
333 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
334 return -ENAMETOOLONG;
335
336 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
337
338 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
339 if (IS_ERR(inode)) {
340 gfs2_holder_uninit(ghs);
341 return PTR_ERR(inode);
342 }
343
344 ip = ghs[1].gh_gl->gl_object;
345
346 ip->i_di.di_size = size;
347
348 error = gfs2_meta_inode_buffer(ip, &dibh);
349
350 if (!gfs2_assert_withdraw(sdp, !error)) {
351 gfs2_dinode_out(ip, dibh->b_data);
352 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
353 size);
354 brelse(dibh);
355 }
356
357 gfs2_trans_end(sdp);
358 if (dip->i_alloc.al_rgd)
359 gfs2_inplace_release(dip);
360 gfs2_quota_unlock(dip);
361 gfs2_alloc_put(dip);
362
363 gfs2_glock_dq_uninit_m(2, ghs);
364
365 d_instantiate(dentry, inode);
366 mark_inode_dirty(inode);
367
368 return 0;
369 }
370
371 /**
372 * gfs2_mkdir - Make a directory
373 * @dir: The parent directory of the new one
374 * @dentry: The dentry of the new directory
375 * @mode: The mode of the new directory
376 *
377 * Returns: errno
378 */
379
380 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
381 {
382 struct gfs2_inode *dip = GFS2_I(dir), *ip;
383 struct gfs2_sbd *sdp = GFS2_SB(dir);
384 struct gfs2_holder ghs[2];
385 struct inode *inode;
386 struct buffer_head *dibh;
387 int error;
388
389 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
390
391 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
392 if (IS_ERR(inode)) {
393 gfs2_holder_uninit(ghs);
394 return PTR_ERR(inode);
395 }
396
397 ip = ghs[1].gh_gl->gl_object;
398
399 ip->i_inode.i_nlink = 2;
400 ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
401 ip->i_di.di_flags |= GFS2_DIF_JDATA;
402 ip->i_di.di_entries = 2;
403
404 error = gfs2_meta_inode_buffer(ip, &dibh);
405
406 if (!gfs2_assert_withdraw(sdp, !error)) {
407 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
408 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
409 struct qstr str;
410
411 gfs2_str2qstr(&str, ".");
412 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
413 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
414 dent->de_inum = di->di_num; /* already GFS2 endian */
415 dent->de_type = cpu_to_be16(DT_DIR);
416 di->di_entries = cpu_to_be32(1);
417
418 gfs2_str2qstr(&str, "..");
419 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
420 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
421
422 gfs2_inum_out(dip, dent);
423 dent->de_type = cpu_to_be16(DT_DIR);
424
425 gfs2_dinode_out(ip, di);
426
427 brelse(dibh);
428 }
429
430 error = gfs2_change_nlink(dip, +1);
431 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
432
433 gfs2_trans_end(sdp);
434 if (dip->i_alloc.al_rgd)
435 gfs2_inplace_release(dip);
436 gfs2_quota_unlock(dip);
437 gfs2_alloc_put(dip);
438
439 gfs2_glock_dq_uninit_m(2, ghs);
440
441 d_instantiate(dentry, inode);
442 mark_inode_dirty(inode);
443
444 return 0;
445 }
446
447 /**
448 * gfs2_rmdir - Remove a directory
449 * @dir: The parent directory of the directory to be removed
450 * @dentry: The dentry of the directory to remove
451 *
452 * Remove a directory. Call gfs2_rmdiri()
453 *
454 * Returns: errno
455 */
456
457 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
458 {
459 struct gfs2_inode *dip = GFS2_I(dir);
460 struct gfs2_sbd *sdp = GFS2_SB(dir);
461 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
462 struct gfs2_holder ghs[3];
463 struct gfs2_rgrpd *rgd;
464 struct gfs2_holder ri_gh;
465 int error;
466
467
468 error = gfs2_rindex_hold(sdp, &ri_gh);
469 if (error)
470 return error;
471 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
472 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
473
474 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
475 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
476
477 error = gfs2_glock_nq_m(3, ghs);
478 if (error)
479 goto out;
480
481 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
482 if (error)
483 goto out_gunlock;
484
485 if (ip->i_di.di_entries < 2) {
486 if (gfs2_consist_inode(ip))
487 gfs2_dinode_print(ip);
488 error = -EIO;
489 goto out_gunlock;
490 }
491 if (ip->i_di.di_entries > 2) {
492 error = -ENOTEMPTY;
493 goto out_gunlock;
494 }
495
496 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
497 if (error)
498 goto out_gunlock;
499
500 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
501
502 gfs2_trans_end(sdp);
503
504 out_gunlock:
505 gfs2_glock_dq_m(3, ghs);
506 out:
507 gfs2_holder_uninit(ghs);
508 gfs2_holder_uninit(ghs + 1);
509 gfs2_holder_uninit(ghs + 2);
510 gfs2_glock_dq_uninit(&ri_gh);
511 return error;
512 }
513
514 /**
515 * gfs2_mknod - Make a special file
516 * @dir: The directory in which the special file will reside
517 * @dentry: The dentry of the special file
518 * @mode: The mode of the special file
519 * @rdev: The device specification of the special file
520 *
521 */
522
523 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
524 dev_t dev)
525 {
526 struct gfs2_inode *dip = GFS2_I(dir);
527 struct gfs2_sbd *sdp = GFS2_SB(dir);
528 struct gfs2_holder ghs[2];
529 struct inode *inode;
530
531 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
532
533 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
534 if (IS_ERR(inode)) {
535 gfs2_holder_uninit(ghs);
536 return PTR_ERR(inode);
537 }
538
539 gfs2_trans_end(sdp);
540 if (dip->i_alloc.al_rgd)
541 gfs2_inplace_release(dip);
542 gfs2_quota_unlock(dip);
543 gfs2_alloc_put(dip);
544
545 gfs2_glock_dq_uninit_m(2, ghs);
546
547 d_instantiate(dentry, inode);
548 mark_inode_dirty(inode);
549
550 return 0;
551 }
552
553 /**
554 * gfs2_rename - Rename a file
555 * @odir: Parent directory of old file name
556 * @odentry: The old dentry of the file
557 * @ndir: Parent directory of new file name
558 * @ndentry: The new dentry of the file
559 *
560 * Returns: errno
561 */
562
563 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
564 struct inode *ndir, struct dentry *ndentry)
565 {
566 struct gfs2_inode *odip = GFS2_I(odir);
567 struct gfs2_inode *ndip = GFS2_I(ndir);
568 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
569 struct gfs2_inode *nip = NULL;
570 struct gfs2_sbd *sdp = GFS2_SB(odir);
571 struct gfs2_holder ghs[5], r_gh;
572 struct gfs2_rgrpd *nrgd;
573 unsigned int num_gh;
574 int dir_rename = 0;
575 int alloc_required;
576 unsigned int x;
577 int error;
578
579 if (ndentry->d_inode) {
580 nip = GFS2_I(ndentry->d_inode);
581 if (ip == nip)
582 return 0;
583 }
584
585 /* Make sure we aren't trying to move a dirctory into it's subdir */
586
587 if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
588 dir_rename = 1;
589
590 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
591 &r_gh);
592 if (error)
593 goto out;
594
595 error = gfs2_ok_to_move(ip, ndip);
596 if (error)
597 goto out_gunlock_r;
598 }
599
600 num_gh = 1;
601 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
602 if (odip != ndip) {
603 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
604 num_gh++;
605 }
606 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
607 num_gh++;
608
609 if (nip) {
610 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
611 num_gh++;
612 /* grab the resource lock for unlink flag twiddling
613 * this is the case of the target file already existing
614 * so we unlink before doing the rename
615 */
616 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
617 if (nrgd)
618 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
619 }
620
621 error = gfs2_glock_nq_m(num_gh, ghs);
622 if (error)
623 goto out_uninit;
624
625 /* Check out the old directory */
626
627 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
628 if (error)
629 goto out_gunlock;
630
631 /* Check out the new directory */
632
633 if (nip) {
634 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
635 if (error)
636 goto out_gunlock;
637
638 if (S_ISDIR(nip->i_inode.i_mode)) {
639 if (nip->i_di.di_entries < 2) {
640 if (gfs2_consist_inode(nip))
641 gfs2_dinode_print(nip);
642 error = -EIO;
643 goto out_gunlock;
644 }
645 if (nip->i_di.di_entries > 2) {
646 error = -ENOTEMPTY;
647 goto out_gunlock;
648 }
649 }
650 } else {
651 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
652 if (error)
653 goto out_gunlock;
654
655 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
656 switch (error) {
657 case -ENOENT:
658 error = 0;
659 break;
660 case 0:
661 error = -EEXIST;
662 default:
663 goto out_gunlock;
664 };
665
666 if (odip != ndip) {
667 if (!ndip->i_inode.i_nlink) {
668 error = -EINVAL;
669 goto out_gunlock;
670 }
671 if (ndip->i_di.di_entries == (u32)-1) {
672 error = -EFBIG;
673 goto out_gunlock;
674 }
675 if (S_ISDIR(ip->i_inode.i_mode) &&
676 ndip->i_inode.i_nlink == (u32)-1) {
677 error = -EMLINK;
678 goto out_gunlock;
679 }
680 }
681 }
682
683 /* Check out the dir to be renamed */
684
685 if (dir_rename) {
686 error = permission(odentry->d_inode, MAY_WRITE, NULL);
687 if (error)
688 goto out_gunlock;
689 }
690
691 alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
692 if (error < 0)
693 goto out_gunlock;
694 error = 0;
695
696 if (alloc_required) {
697 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
698
699 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
700 if (error)
701 goto out_alloc;
702
703 error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid);
704 if (error)
705 goto out_gunlock_q;
706
707 al->al_requested = sdp->sd_max_dirres;
708
709 error = gfs2_inplace_reserve(ndip);
710 if (error)
711 goto out_gunlock_q;
712
713 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
714 al->al_rgd->rd_length +
715 4 * RES_DINODE + 4 * RES_LEAF +
716 RES_STATFS + RES_QUOTA + 4, 0);
717 if (error)
718 goto out_ipreserv;
719 } else {
720 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
721 5 * RES_LEAF + 4, 0);
722 if (error)
723 goto out_gunlock;
724 }
725
726 /* Remove the target file, if it exists */
727
728 if (nip) {
729 if (S_ISDIR(nip->i_inode.i_mode))
730 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
731 else {
732 error = gfs2_dir_del(ndip, &ndentry->d_name);
733 if (error)
734 goto out_end_trans;
735 error = gfs2_change_nlink(nip, -1);
736 }
737 if (error)
738 goto out_end_trans;
739 }
740
741 if (dir_rename) {
742 struct qstr name;
743 gfs2_str2qstr(&name, "..");
744
745 error = gfs2_change_nlink(ndip, +1);
746 if (error)
747 goto out_end_trans;
748 error = gfs2_change_nlink(odip, -1);
749 if (error)
750 goto out_end_trans;
751
752 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
753 if (error)
754 goto out_end_trans;
755 } else {
756 struct buffer_head *dibh;
757 error = gfs2_meta_inode_buffer(ip, &dibh);
758 if (error)
759 goto out_end_trans;
760 ip->i_inode.i_ctime = CURRENT_TIME;
761 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
762 gfs2_dinode_out(ip, dibh->b_data);
763 brelse(dibh);
764 }
765
766 error = gfs2_dir_del(odip, &odentry->d_name);
767 if (error)
768 goto out_end_trans;
769
770 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
771 if (error)
772 goto out_end_trans;
773
774 out_end_trans:
775 gfs2_trans_end(sdp);
776 out_ipreserv:
777 if (alloc_required)
778 gfs2_inplace_release(ndip);
779 out_gunlock_q:
780 if (alloc_required)
781 gfs2_quota_unlock(ndip);
782 out_alloc:
783 if (alloc_required)
784 gfs2_alloc_put(ndip);
785 out_gunlock:
786 gfs2_glock_dq_m(num_gh, ghs);
787 out_uninit:
788 for (x = 0; x < num_gh; x++)
789 gfs2_holder_uninit(ghs + x);
790 out_gunlock_r:
791 if (dir_rename)
792 gfs2_glock_dq_uninit(&r_gh);
793 out:
794 return error;
795 }
796
797 /**
798 * gfs2_readlink - Read the value of a symlink
799 * @dentry: the symlink
800 * @buf: the buffer to read the symlink data into
801 * @size: the size of the buffer
802 *
803 * Returns: errno
804 */
805
806 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
807 int user_size)
808 {
809 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
810 char array[GFS2_FAST_NAME_SIZE], *buf = array;
811 unsigned int len = GFS2_FAST_NAME_SIZE;
812 int error;
813
814 error = gfs2_readlinki(ip, &buf, &len);
815 if (error)
816 return error;
817
818 if (user_size > len - 1)
819 user_size = len - 1;
820
821 if (copy_to_user(user_buf, buf, user_size))
822 error = -EFAULT;
823 else
824 error = user_size;
825
826 if (buf != array)
827 kfree(buf);
828
829 return error;
830 }
831
832 /**
833 * gfs2_follow_link - Follow a symbolic link
834 * @dentry: The dentry of the link
835 * @nd: Data that we pass to vfs_follow_link()
836 *
837 * This can handle symlinks of any size. It is optimised for symlinks
838 * under GFS2_FAST_NAME_SIZE.
839 *
840 * Returns: 0 on success or error code
841 */
842
843 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
844 {
845 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
846 char array[GFS2_FAST_NAME_SIZE], *buf = array;
847 unsigned int len = GFS2_FAST_NAME_SIZE;
848 int error;
849
850 error = gfs2_readlinki(ip, &buf, &len);
851 if (!error) {
852 error = vfs_follow_link(nd, buf);
853 if (buf != array)
854 kfree(buf);
855 }
856
857 return ERR_PTR(error);
858 }
859
860 /**
861 * gfs2_permission -
862 * @inode:
863 * @mask:
864 * @nd: passed from Linux VFS, ignored by us
865 *
866 * This may be called from the VFS directly, or from within GFS2 with the
867 * inode locked, so we look to see if the glock is already locked and only
868 * lock the glock if its not already been done.
869 *
870 * Returns: errno
871 */
872
873 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
874 {
875 struct gfs2_inode *ip = GFS2_I(inode);
876 struct gfs2_holder i_gh;
877 int error;
878 int unlock = 0;
879
880 if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
881 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
882 if (error)
883 return error;
884 unlock = 1;
885 }
886
887 error = generic_permission(inode, mask, gfs2_check_acl);
888 if (unlock)
889 gfs2_glock_dq_uninit(&i_gh);
890
891 return error;
892 }
893
894 static int setattr_size(struct inode *inode, struct iattr *attr)
895 {
896 struct gfs2_inode *ip = GFS2_I(inode);
897 int error;
898
899 if (attr->ia_size != ip->i_di.di_size) {
900 error = vmtruncate(inode, attr->ia_size);
901 if (error)
902 return error;
903 }
904
905 error = gfs2_truncatei(ip, attr->ia_size);
906 if (error && (inode->i_size != ip->i_di.di_size))
907 i_size_write(inode, ip->i_di.di_size);
908
909 return error;
910 }
911
912 static int setattr_chown(struct inode *inode, struct iattr *attr)
913 {
914 struct gfs2_inode *ip = GFS2_I(inode);
915 struct gfs2_sbd *sdp = GFS2_SB(inode);
916 struct buffer_head *dibh;
917 u32 ouid, ogid, nuid, ngid;
918 int error;
919
920 ouid = inode->i_uid;
921 ogid = inode->i_gid;
922 nuid = attr->ia_uid;
923 ngid = attr->ia_gid;
924
925 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
926 ouid = nuid = NO_QUOTA_CHANGE;
927 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
928 ogid = ngid = NO_QUOTA_CHANGE;
929
930 gfs2_alloc_get(ip);
931
932 error = gfs2_quota_lock(ip, nuid, ngid);
933 if (error)
934 goto out_alloc;
935
936 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
937 error = gfs2_quota_check(ip, nuid, ngid);
938 if (error)
939 goto out_gunlock_q;
940 }
941
942 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
943 if (error)
944 goto out_gunlock_q;
945
946 error = gfs2_meta_inode_buffer(ip, &dibh);
947 if (error)
948 goto out_end_trans;
949
950 error = inode_setattr(inode, attr);
951 gfs2_assert_warn(sdp, !error);
952
953 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
954 gfs2_dinode_out(ip, dibh->b_data);
955 brelse(dibh);
956
957 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
958 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
959 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
960 }
961
962 out_end_trans:
963 gfs2_trans_end(sdp);
964 out_gunlock_q:
965 gfs2_quota_unlock(ip);
966 out_alloc:
967 gfs2_alloc_put(ip);
968 return error;
969 }
970
971 /**
972 * gfs2_setattr - Change attributes on an inode
973 * @dentry: The dentry which is changing
974 * @attr: The structure describing the change
975 *
976 * The VFS layer wants to change one or more of an inodes attributes. Write
977 * that change out to disk.
978 *
979 * Returns: errno
980 */
981
982 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
983 {
984 struct inode *inode = dentry->d_inode;
985 struct gfs2_inode *ip = GFS2_I(inode);
986 struct gfs2_holder i_gh;
987 int error;
988
989 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
990 if (error)
991 return error;
992
993 error = -EPERM;
994 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
995 goto out;
996
997 error = inode_change_ok(inode, attr);
998 if (error)
999 goto out;
1000
1001 if (attr->ia_valid & ATTR_SIZE)
1002 error = setattr_size(inode, attr);
1003 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1004 error = setattr_chown(inode, attr);
1005 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1006 error = gfs2_acl_chmod(ip, attr);
1007 else
1008 error = gfs2_setattr_simple(ip, attr);
1009
1010 out:
1011 gfs2_glock_dq_uninit(&i_gh);
1012 if (!error)
1013 mark_inode_dirty(inode);
1014 return error;
1015 }
1016
1017 /**
1018 * gfs2_getattr - Read out an inode's attributes
1019 * @mnt: The vfsmount the inode is being accessed from
1020 * @dentry: The dentry to stat
1021 * @stat: The inode's stats
1022 *
1023 * This may be called from the VFS directly, or from within GFS2 with the
1024 * inode locked, so we look to see if the glock is already locked and only
1025 * lock the glock if its not already been done. Note that its the NFS
1026 * readdirplus operation which causes this to be called (from filldir)
1027 * with the glock already held.
1028 *
1029 * Returns: errno
1030 */
1031
1032 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1033 struct kstat *stat)
1034 {
1035 struct inode *inode = dentry->d_inode;
1036 struct gfs2_inode *ip = GFS2_I(inode);
1037 struct gfs2_holder gh;
1038 int error;
1039 int unlock = 0;
1040
1041 if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
1042 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1043 if (error)
1044 return error;
1045 unlock = 1;
1046 }
1047
1048 generic_fillattr(inode, stat);
1049 if (unlock)
1050 gfs2_glock_dq_uninit(&gh);
1051
1052 return 0;
1053 }
1054
1055 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1056 const void *data, size_t size, int flags)
1057 {
1058 struct inode *inode = dentry->d_inode;
1059 struct gfs2_ea_request er;
1060
1061 memset(&er, 0, sizeof(struct gfs2_ea_request));
1062 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1063 if (er.er_type == GFS2_EATYPE_UNUSED)
1064 return -EOPNOTSUPP;
1065 er.er_data = (char *)data;
1066 er.er_name_len = strlen(er.er_name);
1067 er.er_data_len = size;
1068 er.er_flags = flags;
1069
1070 gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1071
1072 return gfs2_ea_set(GFS2_I(inode), &er);
1073 }
1074
1075 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1076 void *data, size_t size)
1077 {
1078 struct gfs2_ea_request er;
1079
1080 memset(&er, 0, sizeof(struct gfs2_ea_request));
1081 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1082 if (er.er_type == GFS2_EATYPE_UNUSED)
1083 return -EOPNOTSUPP;
1084 er.er_data = data;
1085 er.er_name_len = strlen(er.er_name);
1086 er.er_data_len = size;
1087
1088 return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1089 }
1090
1091 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1092 {
1093 struct gfs2_ea_request er;
1094
1095 memset(&er, 0, sizeof(struct gfs2_ea_request));
1096 er.er_data = (size) ? buffer : NULL;
1097 er.er_data_len = size;
1098
1099 return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1100 }
1101
1102 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1103 {
1104 struct gfs2_ea_request er;
1105
1106 memset(&er, 0, sizeof(struct gfs2_ea_request));
1107 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1108 if (er.er_type == GFS2_EATYPE_UNUSED)
1109 return -EOPNOTSUPP;
1110 er.er_name_len = strlen(er.er_name);
1111
1112 return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1113 }
1114
1115 const struct inode_operations gfs2_file_iops = {
1116 .permission = gfs2_permission,
1117 .setattr = gfs2_setattr,
1118 .getattr = gfs2_getattr,
1119 .setxattr = gfs2_setxattr,
1120 .getxattr = gfs2_getxattr,
1121 .listxattr = gfs2_listxattr,
1122 .removexattr = gfs2_removexattr,
1123 };
1124
1125 const struct inode_operations gfs2_dev_iops = {
1126 .permission = gfs2_permission,
1127 .setattr = gfs2_setattr,
1128 .getattr = gfs2_getattr,
1129 .setxattr = gfs2_setxattr,
1130 .getxattr = gfs2_getxattr,
1131 .listxattr = gfs2_listxattr,
1132 .removexattr = gfs2_removexattr,
1133 };
1134
1135 const struct inode_operations gfs2_dir_iops = {
1136 .create = gfs2_create,
1137 .lookup = gfs2_lookup,
1138 .link = gfs2_link,
1139 .unlink = gfs2_unlink,
1140 .symlink = gfs2_symlink,
1141 .mkdir = gfs2_mkdir,
1142 .rmdir = gfs2_rmdir,
1143 .mknod = gfs2_mknod,
1144 .rename = gfs2_rename,
1145 .permission = gfs2_permission,
1146 .setattr = gfs2_setattr,
1147 .getattr = gfs2_getattr,
1148 .setxattr = gfs2_setxattr,
1149 .getxattr = gfs2_getxattr,
1150 .listxattr = gfs2_listxattr,
1151 .removexattr = gfs2_removexattr,
1152 };
1153
1154 const struct inode_operations gfs2_symlink_iops = {
1155 .readlink = gfs2_readlink,
1156 .follow_link = gfs2_follow_link,
1157 .permission = gfs2_permission,
1158 .setattr = gfs2_setattr,
1159 .getattr = gfs2_getattr,
1160 .setxattr = gfs2_setxattr,
1161 .getxattr = gfs2_getxattr,
1162 .listxattr = gfs2_listxattr,
1163 .removexattr = gfs2_removexattr,
1164 };
1165
WRT350N Kernel Patches