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r8169: add helpers for per-device hw_start handler
[linux-2.6/linux-loongson.git] / fs / gfs2 / ops_inode.c
blobd85f6e05cb955d99cebcad6aa3bd660871cef49f
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_search(dir, &dentry->d_name, NULL, 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_ri.ri_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->i_num,
221 IF2DT(inode->i_mode));
222 if (error)
223 goto out_end_trans;
224
225 error = gfs2_change_nlink(ip, +1);
226
227 out_end_trans:
228 gfs2_trans_end(sdp);
229 out_ipres:
230 if (alloc_required)
231 gfs2_inplace_release(dip);
232 out_gunlock_q:
233 if (alloc_required)
234 gfs2_quota_unlock(dip);
235 out_alloc:
236 if (alloc_required)
237 gfs2_alloc_put(dip);
238 out_gunlock:
239 gfs2_glock_dq_m(2, ghs);
240 out:
241 gfs2_holder_uninit(ghs);
242 gfs2_holder_uninit(ghs + 1);
243 if (!error) {
244 atomic_inc(&inode->i_count);
245 d_instantiate(dentry, inode);
246 mark_inode_dirty(inode);
247 }
248 return error;
249 }
250
251 /**
252 * gfs2_unlink - Unlink a file
253 * @dir: The inode of the directory containing the file to unlink
254 * @dentry: The file itself
255 *
256 * Unlink a file. Call gfs2_unlinki()
257 *
258 * Returns: errno
259 */
260
261 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
262 {
263 struct gfs2_inode *dip = GFS2_I(dir);
264 struct gfs2_sbd *sdp = GFS2_SB(dir);
265 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
266 struct gfs2_holder ghs[3];
267 struct gfs2_rgrpd *rgd;
268 struct gfs2_holder ri_gh;
269 int error;
270
271 error = gfs2_rindex_hold(sdp, &ri_gh);
272 if (error)
273 return error;
274
275 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
276 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
277
278 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
279 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
280
281
282 error = gfs2_glock_nq_m(3, ghs);
283 if (error)
284 goto out;
285
286 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
287 if (error)
288 goto out_gunlock;
289
290 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
291 if (error)
292 goto out_gunlock;
293
294 error = gfs2_dir_del(dip, &dentry->d_name);
295 if (error)
296 goto out_end_trans;
297
298 error = gfs2_change_nlink(ip, -1);
299
300 out_end_trans:
301 gfs2_trans_end(sdp);
302 out_gunlock:
303 gfs2_glock_dq_m(3, ghs);
304 out:
305 gfs2_holder_uninit(ghs);
306 gfs2_holder_uninit(ghs + 1);
307 gfs2_holder_uninit(ghs + 2);
308 gfs2_glock_dq_uninit(&ri_gh);
309 return error;
310 }
311
312 /**
313 * gfs2_symlink - Create a symlink
314 * @dir: The directory to create the symlink in
315 * @dentry: The dentry to put the symlink in
316 * @symname: The thing which the link points to
317 *
318 * Returns: errno
319 */
320
321 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
322 const char *symname)
323 {
324 struct gfs2_inode *dip = GFS2_I(dir), *ip;
325 struct gfs2_sbd *sdp = GFS2_SB(dir);
326 struct gfs2_holder ghs[2];
327 struct inode *inode;
328 struct buffer_head *dibh;
329 int size;
330 int error;
331
332 /* Must be stuffed with a null terminator for gfs2_follow_link() */
333 size = strlen(symname);
334 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
335 return -ENAMETOOLONG;
336
337 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
338
339 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
340 if (IS_ERR(inode)) {
341 gfs2_holder_uninit(ghs);
342 return PTR_ERR(inode);
343 }
344
345 ip = ghs[1].gh_gl->gl_object;
346
347 ip->i_di.di_size = size;
348
349 error = gfs2_meta_inode_buffer(ip, &dibh);
350
351 if (!gfs2_assert_withdraw(sdp, !error)) {
352 gfs2_dinode_out(ip, dibh->b_data);
353 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
354 size);
355 brelse(dibh);
356 }
357
358 gfs2_trans_end(sdp);
359 if (dip->i_alloc.al_rgd)
360 gfs2_inplace_release(dip);
361 gfs2_quota_unlock(dip);
362 gfs2_alloc_put(dip);
363
364 gfs2_glock_dq_uninit_m(2, ghs);
365
366 d_instantiate(dentry, inode);
367 mark_inode_dirty(inode);
368
369 return 0;
370 }
371
372 /**
373 * gfs2_mkdir - Make a directory
374 * @dir: The parent directory of the new one
375 * @dentry: The dentry of the new directory
376 * @mode: The mode of the new directory
377 *
378 * Returns: errno
379 */
380
381 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
382 {
383 struct gfs2_inode *dip = GFS2_I(dir), *ip;
384 struct gfs2_sbd *sdp = GFS2_SB(dir);
385 struct gfs2_holder ghs[2];
386 struct inode *inode;
387 struct buffer_head *dibh;
388 int error;
389
390 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
391
392 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
393 if (IS_ERR(inode)) {
394 gfs2_holder_uninit(ghs);
395 return PTR_ERR(inode);
396 }
397
398 ip = ghs[1].gh_gl->gl_object;
399
400 ip->i_inode.i_nlink = 2;
401 ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
402 ip->i_di.di_flags |= GFS2_DIF_JDATA;
403 ip->i_di.di_entries = 2;
404
405 error = gfs2_meta_inode_buffer(ip, &dibh);
406
407 if (!gfs2_assert_withdraw(sdp, !error)) {
408 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
409 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
410 struct qstr str;
411
412 gfs2_str2qstr(&str, ".");
413 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
414 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
415 dent->de_inum = di->di_num; /* already GFS2 endian */
416 dent->de_type = cpu_to_be16(DT_DIR);
417 di->di_entries = cpu_to_be32(1);
418
419 gfs2_str2qstr(&str, "..");
420 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
421 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
422
423 gfs2_inum_out(&dip->i_num, &dent->de_inum);
424 dent->de_type = cpu_to_be16(DT_DIR);
425
426 gfs2_dinode_out(ip, di);
427
428 brelse(dibh);
429 }
430
431 error = gfs2_change_nlink(dip, +1);
432 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
433
434 gfs2_trans_end(sdp);
435 if (dip->i_alloc.al_rgd)
436 gfs2_inplace_release(dip);
437 gfs2_quota_unlock(dip);
438 gfs2_alloc_put(dip);
439
440 gfs2_glock_dq_uninit_m(2, ghs);
441
442 d_instantiate(dentry, inode);
443 mark_inode_dirty(inode);
444
445 return 0;
446 }
447
448 /**
449 * gfs2_rmdir - Remove a directory
450 * @dir: The parent directory of the directory to be removed
451 * @dentry: The dentry of the directory to remove
452 *
453 * Remove a directory. Call gfs2_rmdiri()
454 *
455 * Returns: errno
456 */
457
458 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
459 {
460 struct gfs2_inode *dip = GFS2_I(dir);
461 struct gfs2_sbd *sdp = GFS2_SB(dir);
462 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
463 struct gfs2_holder ghs[3];
464 struct gfs2_rgrpd *rgd;
465 struct gfs2_holder ri_gh;
466 int error;
467
468
469 error = gfs2_rindex_hold(sdp, &ri_gh);
470 if (error)
471 return error;
472 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
473 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
474
475 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
476 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
477
478 error = gfs2_glock_nq_m(3, ghs);
479 if (error)
480 goto out;
481
482 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
483 if (error)
484 goto out_gunlock;
485
486 if (ip->i_di.di_entries < 2) {
487 if (gfs2_consist_inode(ip))
488 gfs2_dinode_print(ip);
489 error = -EIO;
490 goto out_gunlock;
491 }
492 if (ip->i_di.di_entries > 2) {
493 error = -ENOTEMPTY;
494 goto out_gunlock;
495 }
496
497 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
498 if (error)
499 goto out_gunlock;
500
501 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
502
503 gfs2_trans_end(sdp);
504
505 out_gunlock:
506 gfs2_glock_dq_m(3, ghs);
507 out:
508 gfs2_holder_uninit(ghs);
509 gfs2_holder_uninit(ghs + 1);
510 gfs2_holder_uninit(ghs + 2);
511 gfs2_glock_dq_uninit(&ri_gh);
512 return error;
513 }
514
515 /**
516 * gfs2_mknod - Make a special file
517 * @dir: The directory in which the special file will reside
518 * @dentry: The dentry of the special file
519 * @mode: The mode of the special file
520 * @rdev: The device specification of the special file
521 *
522 */
523
524 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
525 dev_t dev)
526 {
527 struct gfs2_inode *dip = GFS2_I(dir);
528 struct gfs2_sbd *sdp = GFS2_SB(dir);
529 struct gfs2_holder ghs[2];
530 struct inode *inode;
531
532 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
533
534 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
535 if (IS_ERR(inode)) {
536 gfs2_holder_uninit(ghs);
537 return PTR_ERR(inode);
538 }
539
540 gfs2_trans_end(sdp);
541 if (dip->i_alloc.al_rgd)
542 gfs2_inplace_release(dip);
543 gfs2_quota_unlock(dip);
544 gfs2_alloc_put(dip);
545
546 gfs2_glock_dq_uninit_m(2, ghs);
547
548 d_instantiate(dentry, inode);
549 mark_inode_dirty(inode);
550
551 return 0;
552 }
553
554 /**
555 * gfs2_rename - Rename a file
556 * @odir: Parent directory of old file name
557 * @odentry: The old dentry of the file
558 * @ndir: Parent directory of new file name
559 * @ndentry: The new dentry of the file
560 *
561 * Returns: errno
562 */
563
564 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
565 struct inode *ndir, struct dentry *ndentry)
566 {
567 struct gfs2_inode *odip = GFS2_I(odir);
568 struct gfs2_inode *ndip = GFS2_I(ndir);
569 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
570 struct gfs2_inode *nip = NULL;
571 struct gfs2_sbd *sdp = GFS2_SB(odir);
572 struct gfs2_holder ghs[5], r_gh;
573 struct gfs2_rgrpd *nrgd;
574 unsigned int num_gh;
575 int dir_rename = 0;
576 int alloc_required;
577 unsigned int x;
578 int error;
579
580 if (ndentry->d_inode) {
581 nip = GFS2_I(ndentry->d_inode);
582 if (ip == nip)
583 return 0;
584 }
585
586 /* Make sure we aren't trying to move a dirctory into it's subdir */
587
588 if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) {
589 dir_rename = 1;
590
591 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0,
592 &r_gh);
593 if (error)
594 goto out;
595
596 error = gfs2_ok_to_move(ip, ndip);
597 if (error)
598 goto out_gunlock_r;
599 }
600
601 num_gh = 1;
602 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
603 if (odip != ndip) {
604 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
605 num_gh++;
606 }
607 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
608 num_gh++;
609
610 if (nip) {
611 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
612 num_gh++;
613 /* grab the resource lock for unlink flag twiddling
614 * this is the case of the target file already existing
615 * so we unlink before doing the rename
616 */
617 nrgd = gfs2_blk2rgrpd(sdp, nip->i_num.no_addr);
618 if (nrgd)
619 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
620 }
621
622 error = gfs2_glock_nq_m(num_gh, ghs);
623 if (error)
624 goto out_uninit;
625
626 /* Check out the old directory */
627
628 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
629 if (error)
630 goto out_gunlock;
631
632 /* Check out the new directory */
633
634 if (nip) {
635 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
636 if (error)
637 goto out_gunlock;
638
639 if (S_ISDIR(nip->i_inode.i_mode)) {
640 if (nip->i_di.di_entries < 2) {
641 if (gfs2_consist_inode(nip))
642 gfs2_dinode_print(nip);
643 error = -EIO;
644 goto out_gunlock;
645 }
646 if (nip->i_di.di_entries > 2) {
647 error = -ENOTEMPTY;
648 goto out_gunlock;
649 }
650 }
651 } else {
652 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
653 if (error)
654 goto out_gunlock;
655
656 error = gfs2_dir_search(ndir, &ndentry->d_name, NULL, NULL);
657 switch (error) {
658 case -ENOENT:
659 error = 0;
660 break;
661 case 0:
662 error = -EEXIST;
663 default:
664 goto out_gunlock;
665 };
666
667 if (odip != ndip) {
668 if (!ndip->i_inode.i_nlink) {
669 error = -EINVAL;
670 goto out_gunlock;
671 }
672 if (ndip->i_di.di_entries == (u32)-1) {
673 error = -EFBIG;
674 goto out_gunlock;
675 }
676 if (S_ISDIR(ip->i_inode.i_mode) &&
677 ndip->i_inode.i_nlink == (u32)-1) {
678 error = -EMLINK;
679 goto out_gunlock;
680 }
681 }
682 }
683
684 /* Check out the dir to be renamed */
685
686 if (dir_rename) {
687 error = permission(odentry->d_inode, MAY_WRITE, NULL);
688 if (error)
689 goto out_gunlock;
690 }
691
692 alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
693 if (error < 0)
694 goto out_gunlock;
695 error = 0;
696
697 if (alloc_required) {
698 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
699
700 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
701 if (error)
702 goto out_alloc;
703
704 error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid);
705 if (error)
706 goto out_gunlock_q;
707
708 al->al_requested = sdp->sd_max_dirres;
709
710 error = gfs2_inplace_reserve(ndip);
711 if (error)
712 goto out_gunlock_q;
713
714 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
715 al->al_rgd->rd_ri.ri_length +
716 4 * RES_DINODE + 4 * RES_LEAF +
717 RES_STATFS + RES_QUOTA + 4, 0);
718 if (error)
719 goto out_ipreserv;
720 } else {
721 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
722 5 * RES_LEAF + 4, 0);
723 if (error)
724 goto out_gunlock;
725 }
726
727 /* Remove the target file, if it exists */
728
729 if (nip) {
730 if (S_ISDIR(nip->i_inode.i_mode))
731 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
732 else {
733 error = gfs2_dir_del(ndip, &ndentry->d_name);
734 if (error)
735 goto out_end_trans;
736 error = gfs2_change_nlink(nip, -1);
737 }
738 if (error)
739 goto out_end_trans;
740 }
741
742 if (dir_rename) {
743 struct qstr name;
744 gfs2_str2qstr(&name, "..");
745
746 error = gfs2_change_nlink(ndip, +1);
747 if (error)
748 goto out_end_trans;
749 error = gfs2_change_nlink(odip, -1);
750 if (error)
751 goto out_end_trans;
752
753 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
754 if (error)
755 goto out_end_trans;
756 } else {
757 struct buffer_head *dibh;
758 error = gfs2_meta_inode_buffer(ip, &dibh);
759 if (error)
760 goto out_end_trans;
761 ip->i_inode.i_ctime = CURRENT_TIME_SEC;
762 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
763 gfs2_dinode_out(ip, dibh->b_data);
764 brelse(dibh);
765 }
766
767 error = gfs2_dir_del(odip, &odentry->d_name);
768 if (error)
769 goto out_end_trans;
770
771 error = gfs2_dir_add(ndir, &ndentry->d_name, &ip->i_num,
772 IF2DT(ip->i_inode.i_mode));
773 if (error)
774 goto out_end_trans;
775
776 out_end_trans:
777 gfs2_trans_end(sdp);
778 out_ipreserv:
779 if (alloc_required)
780 gfs2_inplace_release(ndip);
781 out_gunlock_q:
782 if (alloc_required)
783 gfs2_quota_unlock(ndip);
784 out_alloc:
785 if (alloc_required)
786 gfs2_alloc_put(ndip);
787 out_gunlock:
788 gfs2_glock_dq_m(num_gh, ghs);
789 out_uninit:
790 for (x = 0; x < num_gh; x++)
791 gfs2_holder_uninit(ghs + x);
792 out_gunlock_r:
793 if (dir_rename)
794 gfs2_glock_dq_uninit(&r_gh);
795 out:
796 return error;
797 }
798
799 /**
800 * gfs2_readlink - Read the value of a symlink
801 * @dentry: the symlink
802 * @buf: the buffer to read the symlink data into
803 * @size: the size of the buffer
804 *
805 * Returns: errno
806 */
807
808 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
809 int user_size)
810 {
811 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
812 char array[GFS2_FAST_NAME_SIZE], *buf = array;
813 unsigned int len = GFS2_FAST_NAME_SIZE;
814 int error;
815
816 error = gfs2_readlinki(ip, &buf, &len);
817 if (error)
818 return error;
819
820 if (user_size > len - 1)
821 user_size = len - 1;
822
823 if (copy_to_user(user_buf, buf, user_size))
824 error = -EFAULT;
825 else
826 error = user_size;
827
828 if (buf != array)
829 kfree(buf);
830
831 return error;
832 }
833
834 /**
835 * gfs2_follow_link - Follow a symbolic link
836 * @dentry: The dentry of the link
837 * @nd: Data that we pass to vfs_follow_link()
838 *
839 * This can handle symlinks of any size. It is optimised for symlinks
840 * under GFS2_FAST_NAME_SIZE.
841 *
842 * Returns: 0 on success or error code
843 */
844
845 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
846 {
847 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
848 char array[GFS2_FAST_NAME_SIZE], *buf = array;
849 unsigned int len = GFS2_FAST_NAME_SIZE;
850 int error;
851
852 error = gfs2_readlinki(ip, &buf, &len);
853 if (!error) {
854 error = vfs_follow_link(nd, buf);
855 if (buf != array)
856 kfree(buf);
857 }
858
859 return ERR_PTR(error);
860 }
861
862 /**
863 * gfs2_permission -
864 * @inode:
865 * @mask:
866 * @nd: passed from Linux VFS, ignored by us
867 *
868 * This may be called from the VFS directly, or from within GFS2 with the
869 * inode locked, so we look to see if the glock is already locked and only
870 * lock the glock if its not already been done.
871 *
872 * Returns: errno
873 */
874
875 static int gfs2_permission(struct inode *inode, int mask, struct nameidata *nd)
876 {
877 struct gfs2_inode *ip = GFS2_I(inode);
878 struct gfs2_holder i_gh;
879 int error;
880 int unlock = 0;
881
882 if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
883 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
884 if (error)
885 return error;
886 unlock = 1;
887 }
888
889 error = generic_permission(inode, mask, gfs2_check_acl);
890 if (unlock)
891 gfs2_glock_dq_uninit(&i_gh);
892
893 return error;
894 }
895
896 static int setattr_size(struct inode *inode, struct iattr *attr)
897 {
898 struct gfs2_inode *ip = GFS2_I(inode);
899 int error;
900
901 if (attr->ia_size != ip->i_di.di_size) {
902 error = vmtruncate(inode, attr->ia_size);
903 if (error)
904 return error;
905 }
906
907 error = gfs2_truncatei(ip, attr->ia_size);
908 if (error)
909 return error;
910
911 return error;
912 }
913
914 static int setattr_chown(struct inode *inode, struct iattr *attr)
915 {
916 struct gfs2_inode *ip = GFS2_I(inode);
917 struct gfs2_sbd *sdp = GFS2_SB(inode);
918 struct buffer_head *dibh;
919 u32 ouid, ogid, nuid, ngid;
920 int error;
921
922 ouid = inode->i_uid;
923 ogid = inode->i_gid;
924 nuid = attr->ia_uid;
925 ngid = attr->ia_gid;
926
927 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
928 ouid = nuid = NO_QUOTA_CHANGE;
929 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
930 ogid = ngid = NO_QUOTA_CHANGE;
931
932 gfs2_alloc_get(ip);
933
934 error = gfs2_quota_lock(ip, nuid, ngid);
935 if (error)
936 goto out_alloc;
937
938 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
939 error = gfs2_quota_check(ip, nuid, ngid);
940 if (error)
941 goto out_gunlock_q;
942 }
943
944 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
945 if (error)
946 goto out_gunlock_q;
947
948 error = gfs2_meta_inode_buffer(ip, &dibh);
949 if (error)
950 goto out_end_trans;
951
952 error = inode_setattr(inode, attr);
953 gfs2_assert_warn(sdp, !error);
954
955 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
956 gfs2_dinode_out(ip, dibh->b_data);
957 brelse(dibh);
958
959 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
960 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
961 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
962 }
963
964 out_end_trans:
965 gfs2_trans_end(sdp);
966 out_gunlock_q:
967 gfs2_quota_unlock(ip);
968 out_alloc:
969 gfs2_alloc_put(ip);
970 return error;
971 }
972
973 /**
974 * gfs2_setattr - Change attributes on an inode
975 * @dentry: The dentry which is changing
976 * @attr: The structure describing the change
977 *
978 * The VFS layer wants to change one or more of an inodes attributes. Write
979 * that change out to disk.
980 *
981 * Returns: errno
982 */
983
984 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
985 {
986 struct inode *inode = dentry->d_inode;
987 struct gfs2_inode *ip = GFS2_I(inode);
988 struct gfs2_holder i_gh;
989 int error;
990
991 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
992 if (error)
993 return error;
994
995 error = -EPERM;
996 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
997 goto out;
998
999 error = inode_change_ok(inode, attr);
1000 if (error)
1001 goto out;
1002
1003 if (attr->ia_valid & ATTR_SIZE)
1004 error = setattr_size(inode, attr);
1005 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1006 error = setattr_chown(inode, attr);
1007 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1008 error = gfs2_acl_chmod(ip, attr);
1009 else
1010 error = gfs2_setattr_simple(ip, attr);
1011
1012 out:
1013 gfs2_glock_dq_uninit(&i_gh);
1014 if (!error)
1015 mark_inode_dirty(inode);
1016 return error;
1017 }
1018
1019 /**
1020 * gfs2_getattr - Read out an inode's attributes
1021 * @mnt: The vfsmount the inode is being accessed from
1022 * @dentry: The dentry to stat
1023 * @stat: The inode's stats
1024 *
1025 * This may be called from the VFS directly, or from within GFS2 with the
1026 * inode locked, so we look to see if the glock is already locked and only
1027 * lock the glock if its not already been done. Note that its the NFS
1028 * readdirplus operation which causes this to be called (from filldir)
1029 * with the glock already held.
1030 *
1031 * Returns: errno
1032 */
1033
1034 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1035 struct kstat *stat)
1036 {
1037 struct inode *inode = dentry->d_inode;
1038 struct gfs2_inode *ip = GFS2_I(inode);
1039 struct gfs2_holder gh;
1040 int error;
1041 int unlock = 0;
1042
1043 if (gfs2_glock_is_locked_by_me(ip->i_gl) == 0) {
1044 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1045 if (error)
1046 return error;
1047 unlock = 1;
1048 }
1049
1050 generic_fillattr(inode, stat);
1051 if (unlock)
1052 gfs2_glock_dq_uninit(&gh);
1053
1054 return 0;
1055 }
1056
1057 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1058 const void *data, size_t size, int flags)
1059 {
1060 struct inode *inode = dentry->d_inode;
1061 struct gfs2_ea_request er;
1062
1063 memset(&er, 0, sizeof(struct gfs2_ea_request));
1064 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1065 if (er.er_type == GFS2_EATYPE_UNUSED)
1066 return -EOPNOTSUPP;
1067 er.er_data = (char *)data;
1068 er.er_name_len = strlen(er.er_name);
1069 er.er_data_len = size;
1070 er.er_flags = flags;
1071
1072 gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1073
1074 return gfs2_ea_set(GFS2_I(inode), &er);
1075 }
1076
1077 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1078 void *data, size_t size)
1079 {
1080 struct gfs2_ea_request er;
1081
1082 memset(&er, 0, sizeof(struct gfs2_ea_request));
1083 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1084 if (er.er_type == GFS2_EATYPE_UNUSED)
1085 return -EOPNOTSUPP;
1086 er.er_data = data;
1087 er.er_name_len = strlen(er.er_name);
1088 er.er_data_len = size;
1089
1090 return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1091 }
1092
1093 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1094 {
1095 struct gfs2_ea_request er;
1096
1097 memset(&er, 0, sizeof(struct gfs2_ea_request));
1098 er.er_data = (size) ? buffer : NULL;
1099 er.er_data_len = size;
1100
1101 return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1102 }
1103
1104 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1105 {
1106 struct gfs2_ea_request er;
1107
1108 memset(&er, 0, sizeof(struct gfs2_ea_request));
1109 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1110 if (er.er_type == GFS2_EATYPE_UNUSED)
1111 return -EOPNOTSUPP;
1112 er.er_name_len = strlen(er.er_name);
1113
1114 return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1115 }
1116
1117 const struct inode_operations gfs2_file_iops = {
1118 .permission = gfs2_permission,
1119 .setattr = gfs2_setattr,
1120 .getattr = gfs2_getattr,
1121 .setxattr = gfs2_setxattr,
1122 .getxattr = gfs2_getxattr,
1123 .listxattr = gfs2_listxattr,
1124 .removexattr = gfs2_removexattr,
1125 };
1126
1127 const struct inode_operations gfs2_dev_iops = {
1128 .permission = gfs2_permission,
1129 .setattr = gfs2_setattr,
1130 .getattr = gfs2_getattr,
1131 .setxattr = gfs2_setxattr,
1132 .getxattr = gfs2_getxattr,
1133 .listxattr = gfs2_listxattr,
1134 .removexattr = gfs2_removexattr,
1135 };
1136
1137 const struct inode_operations gfs2_dir_iops = {
1138 .create = gfs2_create,
1139 .lookup = gfs2_lookup,
1140 .link = gfs2_link,
1141 .unlink = gfs2_unlink,
1142 .symlink = gfs2_symlink,
1143 .mkdir = gfs2_mkdir,
1144 .rmdir = gfs2_rmdir,
1145 .mknod = gfs2_mknod,
1146 .rename = gfs2_rename,
1147 .permission = gfs2_permission,
1148 .setattr = gfs2_setattr,
1149 .getattr = gfs2_getattr,
1150 .setxattr = gfs2_setxattr,
1151 .getxattr = gfs2_getxattr,
1152 .listxattr = gfs2_listxattr,
1153 .removexattr = gfs2_removexattr,
1154 };
1155
1156 const struct inode_operations gfs2_symlink_iops = {
1157 .readlink = gfs2_readlink,
1158 .follow_link = gfs2_follow_link,
1159 .permission = gfs2_permission,
1160 .setattr = gfs2_setattr,
1161 .getattr = gfs2_getattr,
1162 .setxattr = gfs2_setxattr,
1163 .getxattr = gfs2_getxattr,
1164 .listxattr = gfs2_listxattr,
1165 .removexattr = gfs2_removexattr,
1166 };
1167
linux kernel for loongson