aboutsummaryrefslogtreecommitdiffstats
path: root/fs/gfs2/ops_inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/gfs2/ops_inode.c')
-rw-r--r--fs/gfs2/ops_inode.c1151
1 files changed, 1151 insertions, 0 deletions
diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
new file mode 100644
index 000000000000..ef6e5ed70e94
--- /dev/null
+++ b/fs/gfs2/ops_inode.c
@@ -0,0 +1,1151 @@
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/sched.h>
11#include <linux/slab.h>
12#include <linux/spinlock.h>
13#include <linux/completion.h>
14#include <linux/buffer_head.h>
15#include <linux/namei.h>
16#include <linux/utsname.h>
17#include <linux/mm.h>
18#include <linux/xattr.h>
19#include <linux/posix_acl.h>
20#include <linux/gfs2_ondisk.h>
21#include <linux/crc32.h>
22#include <linux/lm_interface.h>
23#include <asm/uaccess.h>
24
25#include "gfs2.h"
26#include "incore.h"
27#include "acl.h"
28#include "bmap.h"
29#include "dir.h"
30#include "eaops.h"
31#include "eattr.h"
32#include "glock.h"
33#include "inode.h"
34#include "meta_io.h"
35#include "ops_dentry.h"
36#include "ops_inode.h"
37#include "quota.h"
38#include "rgrp.h"
39#include "trans.h"
40#include "util.h"
41
42/**
43 * gfs2_create - Create a file
44 * @dir: The directory in which to create the file
45 * @dentry: The dentry of the new file
46 * @mode: The mode of the new file
47 *
48 * Returns: errno
49 */
50
51static int gfs2_create(struct inode *dir, struct dentry *dentry,
52 int mode, struct nameidata *nd)
53{
54 struct gfs2_inode *dip = GFS2_I(dir);
55 struct gfs2_sbd *sdp = GFS2_SB(dir);
56 struct gfs2_holder ghs[2];
57 struct inode *inode;
58
59 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
60
61 for (;;) {
62 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode);
63 if (!IS_ERR(inode)) {
64 gfs2_trans_end(sdp);
65 if (dip->i_alloc.al_rgd)
66 gfs2_inplace_release(dip);
67 gfs2_quota_unlock(dip);
68 gfs2_alloc_put(dip);
69 gfs2_glock_dq_uninit_m(2, ghs);
70 mark_inode_dirty(inode);
71 break;
72 } else if (PTR_ERR(inode) != -EEXIST ||
73 (nd->intent.open.flags & O_EXCL)) {
74 gfs2_holder_uninit(ghs);
75 return PTR_ERR(inode);
76 }
77
78 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
79 if (inode) {
80 if (!IS_ERR(inode)) {
81 gfs2_holder_uninit(ghs);
82 break;
83 } else {
84 gfs2_holder_uninit(ghs);
85 return PTR_ERR(inode);
86 }
87 }
88 }
89
90 d_instantiate(dentry, inode);
91
92 return 0;
93}
94
95/**
96 * gfs2_lookup - Look up a filename in a directory and return its inode
97 * @dir: The directory inode
98 * @dentry: The dentry of the new inode
99 * @nd: passed from Linux VFS, ignored by us
100 *
101 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
102 *
103 * Returns: errno
104 */
105
106static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
107 struct nameidata *nd)
108{
109 struct inode *inode = NULL;
110
111 dentry->d_op = &gfs2_dops;
112
113 inode = gfs2_lookupi(dir, &dentry->d_name, 0, nd);
114 if (inode && IS_ERR(inode))
115 return ERR_PTR(PTR_ERR(inode));
116
117 if (inode)
118 return d_splice_alias(inode, dentry);
119 d_add(dentry, inode);
120
121 return NULL;
122}
123
124/**
125 * gfs2_link - Link to a file
126 * @old_dentry: The inode to link
127 * @dir: Add link to this directory
128 * @dentry: The name of the link
129 *
130 * Link the inode in "old_dentry" into the directory "dir" with the
131 * name in "dentry".
132 *
133 * Returns: errno
134 */
135
136static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
137 struct dentry *dentry)
138{
139 struct gfs2_inode *dip = GFS2_I(dir);
140 struct gfs2_sbd *sdp = GFS2_SB(dir);
141 struct inode *inode = old_dentry->d_inode;
142 struct gfs2_inode *ip = GFS2_I(inode);
143 struct gfs2_holder ghs[2];
144 int alloc_required;
145 int error;
146
147 if (S_ISDIR(ip->i_di.di_mode))
148 return -EPERM;
149
150 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
151 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
152
153 error = gfs2_glock_nq_m(2, ghs);
154 if (error)
155 goto out;
156
157 error = permission(dir, MAY_WRITE | MAY_EXEC, NULL);
158 if (error)
159 goto out_gunlock;
160
161 error = gfs2_dir_search(dir, &dentry->d_name, NULL, NULL);
162 switch (error) {
163 case -ENOENT:
164 break;
165 case 0:
166 error = -EEXIST;
167 default:
168 goto out_gunlock;
169 }
170
171 error = -EINVAL;
172 if (!dip->i_di.di_nlink)
173 goto out_gunlock;
174 error = -EFBIG;
175 if (dip->i_di.di_entries == (u32)-1)
176 goto out_gunlock;
177 error = -EPERM;
178 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
179 goto out_gunlock;
180 error = -EINVAL;
181 if (!ip->i_di.di_nlink)
182 goto out_gunlock;
183 error = -EMLINK;
184 if (ip->i_di.di_nlink == (u32)-1)
185 goto out_gunlock;
186
187 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
188 if (error < 0)
189 goto out_gunlock;
190 error = 0;
191
192 if (alloc_required) {
193 struct gfs2_alloc *al = gfs2_alloc_get(dip);
194
195 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
196 if (error)
197 goto out_alloc;
198
199 error = gfs2_quota_check(dip, dip->i_di.di_uid,
200 dip->i_di.di_gid);
201 if (error)
202 goto out_gunlock_q;
203
204 al->al_requested = sdp->sd_max_dirres;
205
206 error = gfs2_inplace_reserve(dip);
207 if (error)
208 goto out_gunlock_q;
209
210 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
211 al->al_rgd->rd_ri.ri_length +
212 2 * RES_DINODE + RES_STATFS +
213 RES_QUOTA, 0);
214 if (error)
215 goto out_ipres;
216 } else {
217 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
218 if (error)
219 goto out_ipres;
220 }
221
222 error = gfs2_dir_add(dir, &dentry->d_name, &ip->i_num,
223 IF2DT(ip->i_di.di_mode));
224 if (error)
225 goto out_end_trans;
226
227 error = gfs2_change_nlink(ip, +1);
228
229out_end_trans:
230 gfs2_trans_end(sdp);
231out_ipres:
232 if (alloc_required)
233 gfs2_inplace_release(dip);
234out_gunlock_q:
235 if (alloc_required)
236 gfs2_quota_unlock(dip);
237out_alloc:
238 if (alloc_required)
239 gfs2_alloc_put(dip);
240out_gunlock:
241 gfs2_glock_dq_m(2, ghs);
242out:
243 gfs2_holder_uninit(ghs);
244 gfs2_holder_uninit(ghs + 1);
245 if (!error) {
246 atomic_inc(&inode->i_count);
247 d_instantiate(dentry, inode);
248 mark_inode_dirty(inode);
249 }
250 return error;
251}
252
253/**
254 * gfs2_unlink - Unlink a file
255 * @dir: The inode of the directory containing the file to unlink
256 * @dentry: The file itself
257 *
258 * Unlink a file. Call gfs2_unlinki()
259 *
260 * Returns: errno
261 */
262
263static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
264{
265 struct gfs2_inode *dip = GFS2_I(dir);
266 struct gfs2_sbd *sdp = GFS2_SB(dir);
267 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
268 struct gfs2_holder ghs[2];
269 int error;
270
271 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
272 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
273
274 error = gfs2_glock_nq_m(2, ghs);
275 if (error)
276 goto out;
277
278 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
279 if (error)
280 goto out_gunlock;
281
282 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
283 if (error)
284 goto out_gunlock;
285
286 error = gfs2_dir_del(dip, &dentry->d_name);
287 if (error)
288 goto out_end_trans;
289
290 error = gfs2_change_nlink(ip, -1);
291
292out_end_trans:
293 gfs2_trans_end(sdp);
294out_gunlock:
295 gfs2_glock_dq_m(2, ghs);
296out:
297 gfs2_holder_uninit(ghs);
298 gfs2_holder_uninit(ghs + 1);
299 return error;
300}
301
302/**
303 * gfs2_symlink - Create a symlink
304 * @dir: The directory to create the symlink in
305 * @dentry: The dentry to put the symlink in
306 * @symname: The thing which the link points to
307 *
308 * Returns: errno
309 */
310
311static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
312 const char *symname)
313{
314 struct gfs2_inode *dip = GFS2_I(dir), *ip;
315 struct gfs2_sbd *sdp = GFS2_SB(dir);
316 struct gfs2_holder ghs[2];
317 struct inode *inode;
318 struct buffer_head *dibh;
319 int size;
320 int error;
321
322 /* Must be stuffed with a null terminator for gfs2_follow_link() */
323 size = strlen(symname);
324 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
325 return -ENAMETOOLONG;
326
327 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
328
329 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO);
330 if (IS_ERR(inode)) {
331 gfs2_holder_uninit(ghs);
332 return PTR_ERR(inode);
333 }
334
335 ip = ghs[1].gh_gl->gl_object;
336
337 ip->i_di.di_size = size;
338
339 error = gfs2_meta_inode_buffer(ip, &dibh);
340
341 if (!gfs2_assert_withdraw(sdp, !error)) {
342 gfs2_dinode_out(&ip->i_di, dibh->b_data);
343 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
344 size);
345 brelse(dibh);
346 }
347
348 gfs2_trans_end(sdp);
349 if (dip->i_alloc.al_rgd)
350 gfs2_inplace_release(dip);
351 gfs2_quota_unlock(dip);
352 gfs2_alloc_put(dip);
353
354 gfs2_glock_dq_uninit_m(2, ghs);
355
356 d_instantiate(dentry, inode);
357 mark_inode_dirty(inode);
358
359 return 0;
360}
361
362/**
363 * gfs2_mkdir - Make a directory
364 * @dir: The parent directory of the new one
365 * @dentry: The dentry of the new directory
366 * @mode: The mode of the new directory
367 *
368 * Returns: errno
369 */
370
371static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
372{
373 struct gfs2_inode *dip = GFS2_I(dir), *ip;
374 struct gfs2_sbd *sdp = GFS2_SB(dir);
375 struct gfs2_holder ghs[2];
376 struct inode *inode;
377 struct buffer_head *dibh;
378 int error;
379
380 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
381
382 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode);
383 if (IS_ERR(inode)) {
384 gfs2_holder_uninit(ghs);
385 return PTR_ERR(inode);
386 }
387
388 ip = ghs[1].gh_gl->gl_object;
389
390 ip->i_di.di_nlink = 2;
391 ip->i_di.di_size = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
392 ip->i_di.di_flags |= GFS2_DIF_JDATA;
393 ip->i_di.di_payload_format = GFS2_FORMAT_DE;
394 ip->i_di.di_entries = 2;
395
396 error = gfs2_meta_inode_buffer(ip, &dibh);
397
398 if (!gfs2_assert_withdraw(sdp, !error)) {
399 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
400 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
401 struct qstr str;
402
403 gfs2_str2qstr(&str, ".");
404 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
405 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
406 dent->de_inum = di->di_num; /* already GFS2 endian */
407 dent->de_type = cpu_to_be16(DT_DIR);
408 di->di_entries = cpu_to_be32(1);
409
410 gfs2_str2qstr(&str, "..");
411 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
412 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
413
414 gfs2_inum_out(&dip->i_num, &dent->de_inum);
415 dent->de_type = cpu_to_be16(DT_DIR);
416
417 gfs2_dinode_out(&ip->i_di, di);
418
419 brelse(dibh);
420 }
421
422 error = gfs2_change_nlink(dip, +1);
423 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
424
425 gfs2_trans_end(sdp);
426 if (dip->i_alloc.al_rgd)
427 gfs2_inplace_release(dip);
428 gfs2_quota_unlock(dip);
429 gfs2_alloc_put(dip);
430
431 gfs2_glock_dq_uninit_m(2, ghs);
432
433 d_instantiate(dentry, inode);
434 mark_inode_dirty(inode);
435
436 return 0;
437}
438
439/**
440 * gfs2_rmdir - Remove a directory
441 * @dir: The parent directory of the directory to be removed
442 * @dentry: The dentry of the directory to remove
443 *
444 * Remove a directory. Call gfs2_rmdiri()
445 *
446 * Returns: errno
447 */
448
449static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
450{
451 struct gfs2_inode *dip = GFS2_I(dir);
452 struct gfs2_sbd *sdp = GFS2_SB(dir);
453 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
454 struct gfs2_holder ghs[2];
455 int error;
456
457 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
458 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
459
460 error = gfs2_glock_nq_m(2, ghs);
461 if (error)
462 goto out;
463
464 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
465 if (error)
466 goto out_gunlock;
467
468 if (ip->i_di.di_entries < 2) {
469 if (gfs2_consist_inode(ip))
470 gfs2_dinode_print(&ip->i_di);
471 error = -EIO;
472 goto out_gunlock;
473 }
474 if (ip->i_di.di_entries > 2) {
475 error = -ENOTEMPTY;
476 goto out_gunlock;
477 }
478
479 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
480 if (error)
481 goto out_gunlock;
482
483 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
484
485 gfs2_trans_end(sdp);
486
487out_gunlock:
488 gfs2_glock_dq_m(2, ghs);
489out:
490 gfs2_holder_uninit(ghs);
491 gfs2_holder_uninit(ghs + 1);
492 return error;
493}
494
495/**
496 * gfs2_mknod - Make a special file
497 * @dir: The directory in which the special file will reside
498 * @dentry: The dentry of the special file
499 * @mode: The mode of the special file
500 * @rdev: The device specification of the special file
501 *
502 */
503
504static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
505 dev_t dev)
506{
507 struct gfs2_inode *dip = GFS2_I(dir), *ip;
508 struct gfs2_sbd *sdp = GFS2_SB(dir);
509 struct gfs2_holder ghs[2];
510 struct inode *inode;
511 struct buffer_head *dibh;
512 u32 major = 0, minor = 0;
513 int error;
514
515 switch (mode & S_IFMT) {
516 case S_IFBLK:
517 case S_IFCHR:
518 major = MAJOR(dev);
519 minor = MINOR(dev);
520 break;
521 case S_IFIFO:
522 case S_IFSOCK:
523 break;
524 default:
525 return -EOPNOTSUPP;
526 };
527
528 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
529
530 inode = gfs2_createi(ghs, &dentry->d_name, mode);
531 if (IS_ERR(inode)) {
532 gfs2_holder_uninit(ghs);
533 return PTR_ERR(inode);
534 }
535
536 ip = ghs[1].gh_gl->gl_object;
537
538 ip->i_di.di_major = major;
539 ip->i_di.di_minor = minor;
540
541 error = gfs2_meta_inode_buffer(ip, &dibh);
542
543 if (!gfs2_assert_withdraw(sdp, !error)) {
544 gfs2_dinode_out(&ip->i_di, dibh->b_data);
545 brelse(dibh);
546 }
547
548 gfs2_trans_end(sdp);
549 if (dip->i_alloc.al_rgd)
550 gfs2_inplace_release(dip);
551 gfs2_quota_unlock(dip);
552 gfs2_alloc_put(dip);
553
554 gfs2_glock_dq_uninit_m(2, ghs);
555
556 d_instantiate(dentry, inode);
557 mark_inode_dirty(inode);
558
559 return 0;
560}
561
562/**
563 * gfs2_rename - Rename a file
564 * @odir: Parent directory of old file name
565 * @odentry: The old dentry of the file
566 * @ndir: Parent directory of new file name
567 * @ndentry: The new dentry of the file
568 *
569 * Returns: errno
570 */
571
572static int gfs2_rename(struct inode *odir, struct dentry *odentry,
573 struct inode *ndir, struct dentry *ndentry)
574{
575 struct gfs2_inode *odip = GFS2_I(odir);
576 struct gfs2_inode *ndip = GFS2_I(ndir);
577 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
578 struct gfs2_inode *nip = NULL;
579 struct gfs2_sbd *sdp = GFS2_SB(odir);
580 struct gfs2_holder ghs[4], r_gh;
581 unsigned int num_gh;
582 int dir_rename = 0;
583 int alloc_required;
584 unsigned int x;
585 int error;
586
587 if (ndentry->d_inode) {
588 nip = GFS2_I(ndentry->d_inode);
589 if (ip == nip)
590 return 0;
591 }
592
593 /* Make sure we aren't trying to move a dirctory into it's subdir */
594
595 if (S_ISDIR(ip->i_di.di_mode) && odip != ndip) {
596 dir_rename = 1;
597
598 error = gfs2_glock_nq_init(sdp->sd_rename_gl,
599 LM_ST_EXCLUSIVE, 0,
600 &r_gh);
601 if (error)
602 goto out;
603
604 error = gfs2_ok_to_move(ip, ndip);
605 if (error)
606 goto out_gunlock_r;
607 }
608
609 num_gh = 1;
610 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
611 if (odip != ndip) {
612 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
613 num_gh++;
614 }
615 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
616 num_gh++;
617
618 if (nip) {
619 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
620 num_gh++;
621 }
622
623 error = gfs2_glock_nq_m(num_gh, ghs);
624 if (error)
625 goto out_uninit;
626
627 /* Check out the old directory */
628
629 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
630 if (error)
631 goto out_gunlock;
632
633 /* Check out the new directory */
634
635 if (nip) {
636 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
637 if (error)
638 goto out_gunlock;
639
640 if (S_ISDIR(nip->i_di.di_mode)) {
641 if (nip->i_di.di_entries < 2) {
642 if (gfs2_consist_inode(nip))
643 gfs2_dinode_print(&nip->i_di);
644 error = -EIO;
645 goto out_gunlock;
646 }
647 if (nip->i_di.di_entries > 2) {
648 error = -ENOTEMPTY;
649 goto out_gunlock;
650 }
651 }
652 } else {
653 error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL);
654 if (error)
655 goto out_gunlock;
656
657 error = gfs2_dir_search(ndir, &ndentry->d_name, NULL, NULL);
658 switch (error) {
659 case -ENOENT:
660 error = 0;
661 break;
662 case 0:
663 error = -EEXIST;
664 default:
665 goto out_gunlock;
666 };
667
668 if (odip != ndip) {
669 if (!ndip->i_di.di_nlink) {
670 error = -EINVAL;
671 goto out_gunlock;
672 }
673 if (ndip->i_di.di_entries == (u32)-1) {
674 error = -EFBIG;
675 goto out_gunlock;
676 }
677 if (S_ISDIR(ip->i_di.di_mode) &&
678 ndip->i_di.di_nlink == (u32)-1) {
679 error = -EMLINK;
680 goto out_gunlock;
681 }
682 }
683 }
684
685 /* Check out the dir to be renamed */
686
687 if (dir_rename) {
688 error = permission(odentry->d_inode, MAY_WRITE, NULL);
689 if (error)
690 goto out_gunlock;
691 }
692
693 alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
694 if (error < 0)
695 goto out_gunlock;
696 error = 0;
697
698 if (alloc_required) {
699 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
700
701 error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
702 if (error)
703 goto out_alloc;
704
705 error = gfs2_quota_check(ndip, ndip->i_di.di_uid,
706 ndip->i_di.di_gid);
707 if (error)
708 goto out_gunlock_q;
709
710 al->al_requested = sdp->sd_max_dirres;
711
712 error = gfs2_inplace_reserve(ndip);
713 if (error)
714 goto out_gunlock_q;
715
716 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
717 al->al_rgd->rd_ri.ri_length +
718 4 * RES_DINODE + 4 * RES_LEAF +
719 RES_STATFS + RES_QUOTA, 0);
720 if (error)
721 goto out_ipreserv;
722 } else {
723 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
724 5 * RES_LEAF, 0);
725 if (error)
726 goto out_gunlock;
727 }
728
729 /* Remove the target file, if it exists */
730
731 if (nip) {
732 if (S_ISDIR(nip->i_di.di_mode))
733 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
734 else {
735 error = gfs2_dir_del(ndip, &ndentry->d_name);
736 if (error)
737 goto out_end_trans;
738 error = gfs2_change_nlink(nip, -1);
739 }
740 if (error)
741 goto out_end_trans;
742 }
743
744 if (dir_rename) {
745 struct qstr name;
746 gfs2_str2qstr(&name, "..");
747
748 error = gfs2_change_nlink(ndip, +1);
749 if (error)
750 goto out_end_trans;
751 error = gfs2_change_nlink(odip, -1);
752 if (error)
753 goto out_end_trans;
754
755 error = gfs2_dir_mvino(ip, &name, &ndip->i_num, DT_DIR);
756 if (error)
757 goto out_end_trans;
758 } else {
759 struct buffer_head *dibh;
760 error = gfs2_meta_inode_buffer(ip, &dibh);
761 if (error)
762 goto out_end_trans;
763 ip->i_di.di_ctime = get_seconds();
764 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
765 gfs2_dinode_out(&ip->i_di, dibh->b_data);
766 brelse(dibh);
767 }
768
769 error = gfs2_dir_del(odip, &odentry->d_name);
770 if (error)
771 goto out_end_trans;
772
773 error = gfs2_dir_add(ndir, &ndentry->d_name, &ip->i_num,
774 IF2DT(ip->i_di.di_mode));
775 if (error)
776 goto out_end_trans;
777
778out_end_trans:
779 gfs2_trans_end(sdp);
780out_ipreserv:
781 if (alloc_required)
782 gfs2_inplace_release(ndip);
783out_gunlock_q:
784 if (alloc_required)
785 gfs2_quota_unlock(ndip);
786out_alloc:
787 if (alloc_required)
788 gfs2_alloc_put(ndip);
789out_gunlock:
790 gfs2_glock_dq_m(num_gh, ghs);
791out_uninit:
792 for (x = 0; x < num_gh; x++)
793 gfs2_holder_uninit(ghs + x);
794out_gunlock_r:
795 if (dir_rename)
796 gfs2_glock_dq_uninit(&r_gh);
797out:
798 return error;
799}
800
801/**
802 * gfs2_readlink - Read the value of a symlink
803 * @dentry: the symlink
804 * @buf: the buffer to read the symlink data into
805 * @size: the size of the buffer
806 *
807 * Returns: errno
808 */
809
810static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
811 int user_size)
812{
813 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
814 char array[GFS2_FAST_NAME_SIZE], *buf = array;
815 unsigned int len = GFS2_FAST_NAME_SIZE;
816 int error;
817
818 error = gfs2_readlinki(ip, &buf, &len);
819 if (error)
820 return error;
821
822 if (user_size > len - 1)
823 user_size = len - 1;
824
825 if (copy_to_user(user_buf, buf, user_size))
826 error = -EFAULT;
827 else
828 error = user_size;
829
830 if (buf != array)
831 kfree(buf);
832
833 return error;
834}
835
836/**
837 * gfs2_follow_link - Follow a symbolic link
838 * @dentry: The dentry of the link
839 * @nd: Data that we pass to vfs_follow_link()
840 *
841 * This can handle symlinks of any size. It is optimised for symlinks
842 * under GFS2_FAST_NAME_SIZE.
843 *
844 * Returns: 0 on success or error code
845 */
846
847static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
848{
849 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
850 char array[GFS2_FAST_NAME_SIZE], *buf = array;
851 unsigned int len = GFS2_FAST_NAME_SIZE;
852 int error;
853
854 error = gfs2_readlinki(ip, &buf, &len);
855 if (!error) {
856 error = vfs_follow_link(nd, buf);
857 if (buf != array)
858 kfree(buf);
859 }
860
861 return ERR_PTR(error);
862}
863
864/**
865 * gfs2_permission -
866 * @inode:
867 * @mask:
868 * @nd: passed from Linux VFS, ignored by us
869 *
870 * Returns: errno
871 */
872
873static 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
879 if (ip->i_vn == ip->i_gl->gl_vn)
880 return generic_permission(inode, mask, gfs2_check_acl);
881
882 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
883 if (!error) {
884 error = generic_permission(inode, mask, gfs2_check_acl_locked);
885 gfs2_glock_dq_uninit(&i_gh);
886 }
887
888 return error;
889}
890
891static int setattr_size(struct inode *inode, struct iattr *attr)
892{
893 struct gfs2_inode *ip = GFS2_I(inode);
894 int error;
895
896 if (attr->ia_size != ip->i_di.di_size) {
897 error = vmtruncate(inode, attr->ia_size);
898 if (error)
899 return error;
900 }
901
902 error = gfs2_truncatei(ip, attr->ia_size);
903 if (error)
904 return error;
905
906 return error;
907}
908
909static int setattr_chown(struct inode *inode, struct iattr *attr)
910{
911 struct gfs2_inode *ip = GFS2_I(inode);
912 struct gfs2_sbd *sdp = GFS2_SB(inode);
913 struct buffer_head *dibh;
914 u32 ouid, ogid, nuid, ngid;
915 int error;
916
917 ouid = ip->i_di.di_uid;
918 ogid = ip->i_di.di_gid;
919 nuid = attr->ia_uid;
920 ngid = attr->ia_gid;
921
922 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
923 ouid = nuid = NO_QUOTA_CHANGE;
924 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
925 ogid = ngid = NO_QUOTA_CHANGE;
926
927 gfs2_alloc_get(ip);
928
929 error = gfs2_quota_lock(ip, nuid, ngid);
930 if (error)
931 goto out_alloc;
932
933 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
934 error = gfs2_quota_check(ip, nuid, ngid);
935 if (error)
936 goto out_gunlock_q;
937 }
938
939 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
940 if (error)
941 goto out_gunlock_q;
942
943 error = gfs2_meta_inode_buffer(ip, &dibh);
944 if (error)
945 goto out_end_trans;
946
947 error = inode_setattr(inode, attr);
948 gfs2_assert_warn(sdp, !error);
949 gfs2_inode_attr_out(ip);
950
951 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
952 gfs2_dinode_out(&ip->i_di, dibh->b_data);
953 brelse(dibh);
954
955 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
956 gfs2_quota_change(ip, -ip->i_di.di_blocks, ouid, ogid);
957 gfs2_quota_change(ip, ip->i_di.di_blocks, nuid, ngid);
958 }
959
960out_end_trans:
961 gfs2_trans_end(sdp);
962out_gunlock_q:
963 gfs2_quota_unlock(ip);
964out_alloc:
965 gfs2_alloc_put(ip);
966 return error;
967}
968
969/**
970 * gfs2_setattr - Change attributes on an inode
971 * @dentry: The dentry which is changing
972 * @attr: The structure describing the change
973 *
974 * The VFS layer wants to change one or more of an inodes attributes. Write
975 * that change out to disk.
976 *
977 * Returns: errno
978 */
979
980static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
981{
982 struct inode *inode = dentry->d_inode;
983 struct gfs2_inode *ip = GFS2_I(inode);
984 struct gfs2_holder i_gh;
985 int error;
986
987 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
988 if (error)
989 return error;
990
991 error = -EPERM;
992 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
993 goto out;
994
995 error = inode_change_ok(inode, attr);
996 if (error)
997 goto out;
998
999 if (attr->ia_valid & ATTR_SIZE)
1000 error = setattr_size(inode, attr);
1001 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1002 error = setattr_chown(inode, attr);
1003 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1004 error = gfs2_acl_chmod(ip, attr);
1005 else
1006 error = gfs2_setattr_simple(ip, attr);
1007
1008out:
1009 gfs2_glock_dq_uninit(&i_gh);
1010 if (!error)
1011 mark_inode_dirty(inode);
1012 return error;
1013}
1014
1015/**
1016 * gfs2_getattr - Read out an inode's attributes
1017 * @mnt: The vfsmount the inode is being accessed from
1018 * @dentry: The dentry to stat
1019 * @stat: The inode's stats
1020 *
1021 * Returns: errno
1022 */
1023
1024static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1025 struct kstat *stat)
1026{
1027 struct inode *inode = dentry->d_inode;
1028 struct gfs2_inode *ip = GFS2_I(inode);
1029 struct gfs2_holder gh;
1030 int error;
1031
1032 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1033 if (!error) {
1034 generic_fillattr(inode, stat);
1035 gfs2_glock_dq_uninit(&gh);
1036 }
1037
1038 return error;
1039}
1040
1041static int gfs2_setxattr(struct dentry *dentry, const char *name,
1042 const void *data, size_t size, int flags)
1043{
1044 struct inode *inode = dentry->d_inode;
1045 struct gfs2_ea_request er;
1046
1047 memset(&er, 0, sizeof(struct gfs2_ea_request));
1048 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1049 if (er.er_type == GFS2_EATYPE_UNUSED)
1050 return -EOPNOTSUPP;
1051 er.er_data = (char *)data;
1052 er.er_name_len = strlen(er.er_name);
1053 er.er_data_len = size;
1054 er.er_flags = flags;
1055
1056 gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1057
1058 return gfs2_ea_set(GFS2_I(inode), &er);
1059}
1060
1061static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1062 void *data, size_t size)
1063{
1064 struct gfs2_ea_request er;
1065
1066 memset(&er, 0, sizeof(struct gfs2_ea_request));
1067 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1068 if (er.er_type == GFS2_EATYPE_UNUSED)
1069 return -EOPNOTSUPP;
1070 er.er_data = data;
1071 er.er_name_len = strlen(er.er_name);
1072 er.er_data_len = size;
1073
1074 return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1075}
1076
1077static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1078{
1079 struct gfs2_ea_request er;
1080
1081 memset(&er, 0, sizeof(struct gfs2_ea_request));
1082 er.er_data = (size) ? buffer : NULL;
1083 er.er_data_len = size;
1084
1085 return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1086}
1087
1088static int gfs2_removexattr(struct dentry *dentry, const char *name)
1089{
1090 struct gfs2_ea_request er;
1091
1092 memset(&er, 0, sizeof(struct gfs2_ea_request));
1093 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1094 if (er.er_type == GFS2_EATYPE_UNUSED)
1095 return -EOPNOTSUPP;
1096 er.er_name_len = strlen(er.er_name);
1097
1098 return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1099}
1100
1101struct inode_operations gfs2_file_iops = {
1102 .permission = gfs2_permission,
1103 .setattr = gfs2_setattr,
1104 .getattr = gfs2_getattr,
1105 .setxattr = gfs2_setxattr,
1106 .getxattr = gfs2_getxattr,
1107 .listxattr = gfs2_listxattr,
1108 .removexattr = gfs2_removexattr,
1109};
1110
1111struct inode_operations gfs2_dev_iops = {
1112 .permission = gfs2_permission,
1113 .setattr = gfs2_setattr,
1114 .getattr = gfs2_getattr,
1115 .setxattr = gfs2_setxattr,
1116 .getxattr = gfs2_getxattr,
1117 .listxattr = gfs2_listxattr,
1118 .removexattr = gfs2_removexattr,
1119};
1120
1121struct inode_operations gfs2_dir_iops = {
1122 .create = gfs2_create,
1123 .lookup = gfs2_lookup,
1124 .link = gfs2_link,
1125 .unlink = gfs2_unlink,
1126 .symlink = gfs2_symlink,
1127 .mkdir = gfs2_mkdir,
1128 .rmdir = gfs2_rmdir,
1129 .mknod = gfs2_mknod,
1130 .rename = gfs2_rename,
1131 .permission = gfs2_permission,
1132 .setattr = gfs2_setattr,
1133 .getattr = gfs2_getattr,
1134 .setxattr = gfs2_setxattr,
1135 .getxattr = gfs2_getxattr,
1136 .listxattr = gfs2_listxattr,
1137 .removexattr = gfs2_removexattr,
1138};
1139
1140struct inode_operations gfs2_symlink_iops = {
1141 .readlink = gfs2_readlink,
1142 .follow_link = gfs2_follow_link,
1143 .permission = gfs2_permission,
1144 .setattr = gfs2_setattr,
1145 .getattr = gfs2_getattr,
1146 .setxattr = gfs2_setxattr,
1147 .getxattr = gfs2_getxattr,
1148 .listxattr = gfs2_listxattr,
1149 .removexattr = gfs2_removexattr,
1150};
1151
generated by cgit v1.2.2 (git 2.25.0) at 2025-01-04 16:11:37 -0500