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 <linux/fiemap.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 "quota.h"
36 #include "rgrp.h"
37 #include "trans.h"
38 #include "util.h"
39 #include "super.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
gfs2_create(struct inode * dir,struct dentry * dentry,int mode,struct nameidata * nd)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 && nd->flags & LOOKUP_EXCL)) {
73 gfs2_holder_uninit(ghs);
74 return PTR_ERR(inode);
75 }
76
77 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
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
gfs2_lookup(struct inode * dir,struct dentry * dentry,struct nameidata * nd)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);
113 if (inode && IS_ERR(inode))
114 return ERR_CAST(inode);
115
116 if (inode) {
117 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
118 struct gfs2_holder gh;
119 int error;
120 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
121 if (error) {
122 iput(inode);
123 return ERR_PTR(error);
124 }
125 gfs2_glock_dq_uninit(&gh);
126 return d_splice_alias(inode, dentry);
127 }
128 d_add(dentry, inode);
129
130 return NULL;
131 }
132
133 /**
134 * gfs2_link - Link to a file
135 * @old_dentry: The inode to link
136 * @dir: Add link to this directory
137 * @dentry: The name of the link
138 *
139 * Link the inode in "old_dentry" into the directory "dir" with the
140 * name in "dentry".
141 *
142 * Returns: errno
143 */
144
gfs2_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)145 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
146 struct dentry *dentry)
147 {
148 struct gfs2_inode *dip = GFS2_I(dir);
149 struct gfs2_sbd *sdp = GFS2_SB(dir);
150 struct inode *inode = old_dentry->d_inode;
151 struct gfs2_inode *ip = GFS2_I(inode);
152 struct gfs2_holder ghs[2];
153 int alloc_required;
154 int error;
155
156 if (S_ISDIR(inode->i_mode))
157 return -EPERM;
158
159 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
160 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
161
162 error = gfs2_glock_nq(ghs); /* parent */
163 if (error)
164 goto out_parent;
165
166 error = gfs2_glock_nq(ghs + 1); /* child */
167 if (error)
168 goto out_child;
169
170 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC);
171 if (error)
172 goto out_gunlock;
173
174 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
175 switch (error) {
176 case -ENOENT:
177 break;
178 case 0:
179 error = -EEXIST;
180 default:
181 goto out_gunlock;
182 }
183
184 error = -EINVAL;
185 if (!dip->i_inode.i_nlink)
186 goto out_gunlock;
187 error = -EFBIG;
188 if (dip->i_entries == (u32)-1)
189 goto out_gunlock;
190 error = -EPERM;
191 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
192 goto out_gunlock;
193 error = -EINVAL;
194 if (!ip->i_inode.i_nlink)
195 goto out_gunlock;
196 error = -EMLINK;
197 if (ip->i_inode.i_nlink == (u32)-1)
198 goto out_gunlock;
199
200 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
201 if (error < 0)
202 goto out_gunlock;
203 error = 0;
204
205 if (alloc_required) {
206 struct gfs2_alloc *al = gfs2_alloc_get(dip);
207 if (!al) {
208 error = -ENOMEM;
209 goto out_gunlock;
210 }
211
212 error = gfs2_quota_lock_check(dip);
213 if (error)
214 goto out_alloc;
215
216 al->al_requested = sdp->sd_max_dirres;
217
218 error = gfs2_inplace_reserve(dip);
219 if (error)
220 goto out_gunlock_q;
221
222 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
223 al->al_rgd->rd_length +
224 2 * RES_DINODE + RES_STATFS +
225 RES_QUOTA, 0);
226 if (error)
227 goto out_ipres;
228 } else {
229 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
230 if (error)
231 goto out_ipres;
232 }
233
234 error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
235 if (error)
236 goto out_end_trans;
237
238 error = gfs2_change_nlink(ip, +1);
239
240 out_end_trans:
241 gfs2_trans_end(sdp);
242 out_ipres:
243 if (alloc_required)
244 gfs2_inplace_release(dip);
245 out_gunlock_q:
246 if (alloc_required)
247 gfs2_quota_unlock(dip);
248 out_alloc:
249 if (alloc_required)
250 gfs2_alloc_put(dip);
251 out_gunlock:
252 gfs2_glock_dq(ghs + 1);
253 out_child:
254 gfs2_glock_dq(ghs);
255 out_parent:
256 gfs2_holder_uninit(ghs);
257 gfs2_holder_uninit(ghs + 1);
258 if (!error) {
259 atomic_inc(&inode->i_count);
260 d_instantiate(dentry, inode);
261 mark_inode_dirty(inode);
262 }
263 return error;
264 }
265
266 /**
267 * gfs2_unlink - Unlink a file
268 * @dir: The inode of the directory containing the file to unlink
269 * @dentry: The file itself
270 *
271 * Unlink a file. Call gfs2_unlinki()
272 *
273 * Returns: errno
274 */
275
gfs2_unlink(struct inode * dir,struct dentry * dentry)276 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
277 {
278 struct gfs2_inode *dip = GFS2_I(dir);
279 struct gfs2_sbd *sdp = GFS2_SB(dir);
280 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
281 struct gfs2_holder ghs[3];
282 struct gfs2_rgrpd *rgd;
283 struct gfs2_holder ri_gh;
284 int error;
285
286 error = gfs2_rindex_hold(sdp, &ri_gh);
287 if (error)
288 return error;
289
290 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
291 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
292
293 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
294 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
295
296
297 error = gfs2_glock_nq(ghs); /* parent */
298 if (error)
299 goto out_parent;
300
301 error = gfs2_glock_nq(ghs + 1); /* child */
302 if (error)
303 goto out_child;
304
305 error = gfs2_glock_nq(ghs + 2); /* rgrp */
306 if (error)
307 goto out_rgrp;
308
309 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
310 if (error)
311 goto out_gunlock;
312
313 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
314 if (error)
315 goto out_rgrp;
316
317 error = gfs2_dir_del(dip, &dentry->d_name);
318 if (error)
319 goto out_end_trans;
320
321 error = gfs2_change_nlink(ip, -1);
322
323 out_end_trans:
324 gfs2_trans_end(sdp);
325 out_gunlock:
326 gfs2_glock_dq(ghs + 2);
327 out_rgrp:
328 gfs2_holder_uninit(ghs + 2);
329 gfs2_glock_dq(ghs + 1);
330 out_child:
331 gfs2_holder_uninit(ghs + 1);
332 gfs2_glock_dq(ghs);
333 out_parent:
334 gfs2_holder_uninit(ghs);
335 gfs2_glock_dq_uninit(&ri_gh);
336 return error;
337 }
338
339 /**
340 * gfs2_symlink - Create a symlink
341 * @dir: The directory to create the symlink in
342 * @dentry: The dentry to put the symlink in
343 * @symname: The thing which the link points to
344 *
345 * Returns: errno
346 */
347
gfs2_symlink(struct inode * dir,struct dentry * dentry,const char * symname)348 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
349 const char *symname)
350 {
351 struct gfs2_inode *dip = GFS2_I(dir), *ip;
352 struct gfs2_sbd *sdp = GFS2_SB(dir);
353 struct gfs2_holder ghs[2];
354 struct inode *inode;
355 struct buffer_head *dibh;
356 int size;
357 int error;
358
359 /* Must be stuffed with a null terminator for gfs2_follow_link() */
360 size = strlen(symname);
361 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
362 return -ENAMETOOLONG;
363
364 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
365
366 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
367 if (IS_ERR(inode)) {
368 gfs2_holder_uninit(ghs);
369 return PTR_ERR(inode);
370 }
371
372 ip = ghs[1].gh_gl->gl_object;
373
374 ip->i_disksize = size;
375
376 error = gfs2_meta_inode_buffer(ip, &dibh);
377
378 if (!gfs2_assert_withdraw(sdp, !error)) {
379 gfs2_dinode_out(ip, dibh->b_data);
380 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
381 size);
382 brelse(dibh);
383 }
384
385 gfs2_trans_end(sdp);
386 if (dip->i_alloc->al_rgd)
387 gfs2_inplace_release(dip);
388 gfs2_quota_unlock(dip);
389 gfs2_alloc_put(dip);
390
391 gfs2_glock_dq_uninit_m(2, ghs);
392
393 d_instantiate(dentry, inode);
394 mark_inode_dirty(inode);
395
396 return 0;
397 }
398
399 /**
400 * gfs2_mkdir - Make a directory
401 * @dir: The parent directory of the new one
402 * @dentry: The dentry of the new directory
403 * @mode: The mode of the new directory
404 *
405 * Returns: errno
406 */
407
gfs2_mkdir(struct inode * dir,struct dentry * dentry,int mode)408 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
409 {
410 struct gfs2_inode *dip = GFS2_I(dir), *ip;
411 struct gfs2_sbd *sdp = GFS2_SB(dir);
412 struct gfs2_holder ghs[2];
413 struct inode *inode;
414 struct buffer_head *dibh;
415 int error;
416
417 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
418
419 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
420 if (IS_ERR(inode)) {
421 gfs2_holder_uninit(ghs);
422 return PTR_ERR(inode);
423 }
424
425 ip = ghs[1].gh_gl->gl_object;
426
427 ip->i_inode.i_nlink = 2;
428 ip->i_disksize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode);
429 ip->i_diskflags |= GFS2_DIF_JDATA;
430 ip->i_entries = 2;
431
432 error = gfs2_meta_inode_buffer(ip, &dibh);
433
434 if (!gfs2_assert_withdraw(sdp, !error)) {
435 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
436 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
437 struct qstr str;
438
439 gfs2_str2qstr(&str, ".");
440 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
441 gfs2_qstr2dirent(&str, GFS2_DIRENT_SIZE(str.len), dent);
442 dent->de_inum = di->di_num; /* already GFS2 endian */
443 dent->de_type = cpu_to_be16(DT_DIR);
444 di->di_entries = cpu_to_be32(1);
445
446 gfs2_str2qstr(&str, "..");
447 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
448 gfs2_qstr2dirent(&str, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
449
450 gfs2_inum_out(dip, dent);
451 dent->de_type = cpu_to_be16(DT_DIR);
452
453 gfs2_dinode_out(ip, di);
454
455 brelse(dibh);
456 }
457
458 error = gfs2_change_nlink(dip, +1);
459 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
460
461 gfs2_trans_end(sdp);
462 if (dip->i_alloc->al_rgd)
463 gfs2_inplace_release(dip);
464 gfs2_quota_unlock(dip);
465 gfs2_alloc_put(dip);
466
467 gfs2_glock_dq_uninit_m(2, ghs);
468
469 d_instantiate(dentry, inode);
470 mark_inode_dirty(inode);
471
472 return 0;
473 }
474
475 /**
476 * gfs2_rmdir - Remove a directory
477 * @dir: The parent directory of the directory to be removed
478 * @dentry: The dentry of the directory to remove
479 *
480 * Remove a directory. Call gfs2_rmdiri()
481 *
482 * Returns: errno
483 */
484
gfs2_rmdir(struct inode * dir,struct dentry * dentry)485 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
486 {
487 struct gfs2_inode *dip = GFS2_I(dir);
488 struct gfs2_sbd *sdp = GFS2_SB(dir);
489 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
490 struct gfs2_holder ghs[3];
491 struct gfs2_rgrpd *rgd;
492 struct gfs2_holder ri_gh;
493 int error;
494
495 error = gfs2_rindex_hold(sdp, &ri_gh);
496 if (error)
497 return error;
498 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
499 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
500
501 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
502 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
503
504 error = gfs2_glock_nq(ghs); /* parent */
505 if (error)
506 goto out_parent;
507
508 error = gfs2_glock_nq(ghs + 1); /* child */
509 if (error)
510 goto out_child;
511
512 error = gfs2_glock_nq(ghs + 2); /* rgrp */
513 if (error)
514 goto out_rgrp;
515
516 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
517 if (error)
518 goto out_gunlock;
519
520 if (ip->i_entries < 2) {
521 if (gfs2_consist_inode(ip))
522 gfs2_dinode_print(ip);
523 error = -EIO;
524 goto out_gunlock;
525 }
526 if (ip->i_entries > 2) {
527 error = -ENOTEMPTY;
528 goto out_gunlock;
529 }
530
531 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
532 if (error)
533 goto out_gunlock;
534
535 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
536
537 gfs2_trans_end(sdp);
538
539 out_gunlock:
540 gfs2_glock_dq(ghs + 2);
541 out_rgrp:
542 gfs2_holder_uninit(ghs + 2);
543 gfs2_glock_dq(ghs + 1);
544 out_child:
545 gfs2_holder_uninit(ghs + 1);
546 gfs2_glock_dq(ghs);
547 out_parent:
548 gfs2_holder_uninit(ghs);
549 gfs2_glock_dq_uninit(&ri_gh);
550 return error;
551 }
552
553 /**
554 * gfs2_mknod - Make a special file
555 * @dir: The directory in which the special file will reside
556 * @dentry: The dentry of the special file
557 * @mode: The mode of the special file
558 * @rdev: The device specification of the special file
559 *
560 */
561
gfs2_mknod(struct inode * dir,struct dentry * dentry,int mode,dev_t dev)562 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
563 dev_t dev)
564 {
565 struct gfs2_inode *dip = GFS2_I(dir);
566 struct gfs2_sbd *sdp = GFS2_SB(dir);
567 struct gfs2_holder ghs[2];
568 struct inode *inode;
569
570 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
571
572 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
573 if (IS_ERR(inode)) {
574 gfs2_holder_uninit(ghs);
575 return PTR_ERR(inode);
576 }
577
578 gfs2_trans_end(sdp);
579 if (dip->i_alloc->al_rgd)
580 gfs2_inplace_release(dip);
581 gfs2_quota_unlock(dip);
582 gfs2_alloc_put(dip);
583
584 gfs2_glock_dq_uninit_m(2, ghs);
585
586 d_instantiate(dentry, inode);
587 mark_inode_dirty(inode);
588
589 return 0;
590 }
591
592 /*
593 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
594 * @this: move this
595 * @to: to here
596 *
597 * Follow @to back to the root and make sure we don't encounter @this
598 * Assumes we already hold the rename lock.
599 *
600 * Returns: errno
601 */
602
gfs2_ok_to_move(struct gfs2_inode * this,struct gfs2_inode * to)603 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
604 {
605 struct inode *dir = &to->i_inode;
606 struct super_block *sb = dir->i_sb;
607 struct inode *tmp;
608 struct qstr dotdot;
609 int error = 0;
610
611 gfs2_str2qstr(&dotdot, "..");
612
613 igrab(dir);
614
615 for (;;) {
616 if (dir == &this->i_inode) {
617 error = -EINVAL;
618 break;
619 }
620 if (dir == sb->s_root->d_inode) {
621 error = 0;
622 break;
623 }
624
625 tmp = gfs2_lookupi(dir, &dotdot, 1);
626 if (IS_ERR(tmp)) {
627 error = PTR_ERR(tmp);
628 break;
629 }
630
631 iput(dir);
632 dir = tmp;
633 }
634
635 iput(dir);
636
637 return error;
638 }
639
640 /**
641 * gfs2_rename - Rename a file
642 * @odir: Parent directory of old file name
643 * @odentry: The old dentry of the file
644 * @ndir: Parent directory of new file name
645 * @ndentry: The new dentry of the file
646 *
647 * Returns: errno
648 */
649
gfs2_rename(struct inode * odir,struct dentry * odentry,struct inode * ndir,struct dentry * ndentry)650 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
651 struct inode *ndir, struct dentry *ndentry)
652 {
653 struct gfs2_inode *odip = GFS2_I(odir);
654 struct gfs2_inode *ndip = GFS2_I(ndir);
655 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
656 struct gfs2_inode *nip = NULL;
657 struct gfs2_sbd *sdp = GFS2_SB(odir);
658 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, };
659 struct gfs2_rgrpd *nrgd;
660 unsigned int num_gh;
661 int dir_rename = 0;
662 int alloc_required;
663 unsigned int x;
664 int error;
665
666 if (ndentry->d_inode) {
667 nip = GFS2_I(ndentry->d_inode);
668 if (ip == nip)
669 return 0;
670 }
671
672
673 if (odip != ndip) {
674 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
675 0, &r_gh);
676 if (error)
677 goto out;
678
679 if (S_ISDIR(ip->i_inode.i_mode)) {
680 dir_rename = 1;
681 /* don't move a dirctory into it's subdir */
682 error = gfs2_ok_to_move(ip, ndip);
683 if (error)
684 goto out_gunlock_r;
685 }
686 }
687
688 num_gh = 1;
689 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
690 if (odip != ndip) {
691 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
692 num_gh++;
693 }
694 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
695 num_gh++;
696
697 if (nip) {
698 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
699 num_gh++;
700 /* grab the resource lock for unlink flag twiddling
701 * this is the case of the target file already existing
702 * so we unlink before doing the rename
703 */
704 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
705 if (nrgd)
706 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
707 }
708
709 for (x = 0; x < num_gh; x++) {
710 error = gfs2_glock_nq(ghs + x);
711 if (error)
712 goto out_gunlock;
713 }
714
715 /* Check out the old directory */
716
717 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
718 if (error)
719 goto out_gunlock;
720
721 /* Check out the new directory */
722
723 if (nip) {
724 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
725 if (error)
726 goto out_gunlock;
727
728 if (S_ISDIR(nip->i_inode.i_mode)) {
729 if (nip->i_entries < 2) {
730 if (gfs2_consist_inode(nip))
731 gfs2_dinode_print(nip);
732 error = -EIO;
733 goto out_gunlock;
734 }
735 if (nip->i_entries > 2) {
736 error = -ENOTEMPTY;
737 goto out_gunlock;
738 }
739 }
740 } else {
741 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC);
742 if (error)
743 goto out_gunlock;
744
745 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
746 switch (error) {
747 case -ENOENT:
748 error = 0;
749 break;
750 case 0:
751 error = -EEXIST;
752 default:
753 goto out_gunlock;
754 };
755
756 if (odip != ndip) {
757 if (!ndip->i_inode.i_nlink) {
758 error = -EINVAL;
759 goto out_gunlock;
760 }
761 if (ndip->i_entries == (u32)-1) {
762 error = -EFBIG;
763 goto out_gunlock;
764 }
765 if (S_ISDIR(ip->i_inode.i_mode) &&
766 ndip->i_inode.i_nlink == (u32)-1) {
767 error = -EMLINK;
768 goto out_gunlock;
769 }
770 }
771 }
772
773 /* Check out the dir to be renamed */
774
775 if (dir_rename) {
776 error = gfs2_permission(odentry->d_inode, MAY_WRITE);
777 if (error)
778 goto out_gunlock;
779 }
780
781 alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
782 if (error < 0)
783 goto out_gunlock;
784 error = 0;
785
786 if (alloc_required) {
787 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
788 if (!al) {
789 error = -ENOMEM;
790 goto out_gunlock;
791 }
792
793 error = gfs2_quota_lock_check(ndip);
794 if (error)
795 goto out_alloc;
796
797 al->al_requested = sdp->sd_max_dirres;
798
799 error = gfs2_inplace_reserve(ndip);
800 if (error)
801 goto out_gunlock_q;
802
803 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
804 al->al_rgd->rd_length +
805 4 * RES_DINODE + 4 * RES_LEAF +
806 RES_STATFS + RES_QUOTA + 4, 0);
807 if (error)
808 goto out_ipreserv;
809 } else {
810 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
811 5 * RES_LEAF + 4, 0);
812 if (error)
813 goto out_gunlock;
814 }
815
816 /* Remove the target file, if it exists */
817
818 if (nip) {
819 if (S_ISDIR(nip->i_inode.i_mode))
820 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
821 else {
822 error = gfs2_dir_del(ndip, &ndentry->d_name);
823 if (error)
824 goto out_end_trans;
825 error = gfs2_change_nlink(nip, -1);
826 }
827 if (error)
828 goto out_end_trans;
829 }
830
831 if (dir_rename) {
832 struct qstr name;
833 gfs2_str2qstr(&name, "..");
834
835 error = gfs2_change_nlink(ndip, +1);
836 if (error)
837 goto out_end_trans;
838 error = gfs2_change_nlink(odip, -1);
839 if (error)
840 goto out_end_trans;
841
842 error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR);
843 if (error)
844 goto out_end_trans;
845 } else {
846 struct buffer_head *dibh;
847 error = gfs2_meta_inode_buffer(ip, &dibh);
848 if (error)
849 goto out_end_trans;
850 ip->i_inode.i_ctime = CURRENT_TIME;
851 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
852 gfs2_dinode_out(ip, dibh->b_data);
853 brelse(dibh);
854 }
855
856 error = gfs2_dir_del(odip, &odentry->d_name);
857 if (error)
858 goto out_end_trans;
859
860 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
861 if (error)
862 goto out_end_trans;
863
864 out_end_trans:
865 gfs2_trans_end(sdp);
866 out_ipreserv:
867 if (alloc_required)
868 gfs2_inplace_release(ndip);
869 out_gunlock_q:
870 if (alloc_required)
871 gfs2_quota_unlock(ndip);
872 out_alloc:
873 if (alloc_required)
874 gfs2_alloc_put(ndip);
875 out_gunlock:
876 while (x--) {
877 gfs2_glock_dq(ghs + x);
878 gfs2_holder_uninit(ghs + x);
879 }
880 out_gunlock_r:
881 if (r_gh.gh_gl)
882 gfs2_glock_dq_uninit(&r_gh);
883 out:
884 return error;
885 }
886
887 /**
888 * gfs2_readlink - Read the value of a symlink
889 * @dentry: the symlink
890 * @buf: the buffer to read the symlink data into
891 * @size: the size of the buffer
892 *
893 * Returns: errno
894 */
895
gfs2_readlink(struct dentry * dentry,char __user * user_buf,int user_size)896 static int gfs2_readlink(struct dentry *dentry, char __user *user_buf,
897 int user_size)
898 {
899 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
900 char array[GFS2_FAST_NAME_SIZE], *buf = array;
901 unsigned int len = GFS2_FAST_NAME_SIZE;
902 int error;
903
904 error = gfs2_readlinki(ip, &buf, &len);
905 if (error)
906 return error;
907
908 if (user_size > len - 1)
909 user_size = len - 1;
910
911 if (copy_to_user(user_buf, buf, user_size))
912 error = -EFAULT;
913 else
914 error = user_size;
915
916 if (buf != array)
917 kfree(buf);
918
919 return error;
920 }
921
922 /**
923 * gfs2_follow_link - Follow a symbolic link
924 * @dentry: The dentry of the link
925 * @nd: Data that we pass to vfs_follow_link()
926 *
927 * This can handle symlinks of any size. It is optimised for symlinks
928 * under GFS2_FAST_NAME_SIZE.
929 *
930 * Returns: 0 on success or error code
931 */
932
gfs2_follow_link(struct dentry * dentry,struct nameidata * nd)933 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
934 {
935 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
936 char array[GFS2_FAST_NAME_SIZE], *buf = array;
937 unsigned int len = GFS2_FAST_NAME_SIZE;
938 int error;
939
940 error = gfs2_readlinki(ip, &buf, &len);
941 if (!error) {
942 error = vfs_follow_link(nd, buf);
943 if (buf != array)
944 kfree(buf);
945 }
946
947 return ERR_PTR(error);
948 }
949
950 /**
951 * gfs2_permission -
952 * @inode:
953 * @mask:
954 * @nd: passed from Linux VFS, ignored by us
955 *
956 * This may be called from the VFS directly, or from within GFS2 with the
957 * inode locked, so we look to see if the glock is already locked and only
958 * lock the glock if its not already been done.
959 *
960 * Returns: errno
961 */
962
gfs2_permission(struct inode * inode,int mask)963 int gfs2_permission(struct inode *inode, int mask)
964 {
965 struct gfs2_inode *ip = GFS2_I(inode);
966 struct gfs2_holder i_gh;
967 int error;
968 int unlock = 0;
969
970 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
971 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
972 if (error)
973 return error;
974 unlock = 1;
975 }
976
977 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
978 error = -EACCES;
979 else
980 error = generic_permission(inode, mask, gfs2_check_acl);
981 if (unlock)
982 gfs2_glock_dq_uninit(&i_gh);
983
984 return error;
985 }
986
setattr_size(struct inode * inode,struct iattr * attr)987 static int setattr_size(struct inode *inode, struct iattr *attr)
988 {
989 struct gfs2_inode *ip = GFS2_I(inode);
990 struct gfs2_sbd *sdp = GFS2_SB(inode);
991 int error;
992
993 if (attr->ia_size != ip->i_disksize) {
994 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
995 if (error)
996 return error;
997 error = vmtruncate(inode, attr->ia_size);
998 gfs2_trans_end(sdp);
999 if (error)
1000 return error;
1001 }
1002
1003 error = gfs2_truncatei(ip, attr->ia_size);
1004 if (error && (inode->i_size != ip->i_disksize))
1005 i_size_write(inode, ip->i_disksize);
1006
1007 return error;
1008 }
1009
setattr_chown(struct inode * inode,struct iattr * attr)1010 static int setattr_chown(struct inode *inode, struct iattr *attr)
1011 {
1012 struct gfs2_inode *ip = GFS2_I(inode);
1013 struct gfs2_sbd *sdp = GFS2_SB(inode);
1014 struct buffer_head *dibh;
1015 u32 ouid, ogid, nuid, ngid;
1016 int error;
1017
1018 ouid = inode->i_uid;
1019 ogid = inode->i_gid;
1020 nuid = attr->ia_uid;
1021 ngid = attr->ia_gid;
1022
1023 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1024 ouid = nuid = NO_QUOTA_CHANGE;
1025 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1026 ogid = ngid = NO_QUOTA_CHANGE;
1027
1028 if (!gfs2_alloc_get(ip))
1029 return -ENOMEM;
1030
1031 error = gfs2_quota_lock(ip, nuid, ngid);
1032 if (error)
1033 goto out_alloc;
1034
1035 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1036 error = gfs2_quota_check(ip, nuid, ngid);
1037 if (error)
1038 goto out_gunlock_q;
1039 }
1040
1041 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1042 if (error)
1043 goto out_gunlock_q;
1044
1045 error = gfs2_meta_inode_buffer(ip, &dibh);
1046 if (error)
1047 goto out_end_trans;
1048
1049 error = inode_setattr(inode, attr);
1050 gfs2_assert_warn(sdp, !error);
1051
1052 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1053 gfs2_dinode_out(ip, dibh->b_data);
1054 brelse(dibh);
1055
1056 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1057 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1058 gfs2_quota_change(ip, -blocks, ouid, ogid);
1059 gfs2_quota_change(ip, blocks, nuid, ngid);
1060 }
1061
1062 out_end_trans:
1063 gfs2_trans_end(sdp);
1064 out_gunlock_q:
1065 gfs2_quota_unlock(ip);
1066 out_alloc:
1067 gfs2_alloc_put(ip);
1068 return error;
1069 }
1070
1071 /**
1072 * gfs2_setattr - Change attributes on an inode
1073 * @dentry: The dentry which is changing
1074 * @attr: The structure describing the change
1075 *
1076 * The VFS layer wants to change one or more of an inodes attributes. Write
1077 * that change out to disk.
1078 *
1079 * Returns: errno
1080 */
1081
gfs2_setattr(struct dentry * dentry,struct iattr * attr)1082 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1083 {
1084 struct inode *inode = dentry->d_inode;
1085 struct gfs2_inode *ip = GFS2_I(inode);
1086 struct gfs2_holder i_gh;
1087 int error;
1088
1089 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1090 if (error)
1091 return error;
1092
1093 error = -EPERM;
1094 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1095 goto out;
1096
1097 error = inode_change_ok(inode, attr);
1098 if (error)
1099 goto out;
1100
1101 if (attr->ia_valid & ATTR_SIZE)
1102 error = setattr_size(inode, attr);
1103 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1104 error = setattr_chown(inode, attr);
1105 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1106 error = gfs2_acl_chmod(ip, attr);
1107 else
1108 error = gfs2_setattr_simple(ip, attr);
1109
1110 out:
1111 gfs2_glock_dq_uninit(&i_gh);
1112 if (!error)
1113 mark_inode_dirty(inode);
1114 return error;
1115 }
1116
1117 /**
1118 * gfs2_getattr - Read out an inode's attributes
1119 * @mnt: The vfsmount the inode is being accessed from
1120 * @dentry: The dentry to stat
1121 * @stat: The inode's stats
1122 *
1123 * This may be called from the VFS directly, or from within GFS2 with the
1124 * inode locked, so we look to see if the glock is already locked and only
1125 * lock the glock if its not already been done. Note that its the NFS
1126 * readdirplus operation which causes this to be called (from filldir)
1127 * with the glock already held.
1128 *
1129 * Returns: errno
1130 */
1131
gfs2_getattr(struct vfsmount * mnt,struct dentry * dentry,struct kstat * stat)1132 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1133 struct kstat *stat)
1134 {
1135 struct inode *inode = dentry->d_inode;
1136 struct gfs2_inode *ip = GFS2_I(inode);
1137 struct gfs2_holder gh;
1138 int error;
1139 int unlock = 0;
1140
1141 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1142 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1143 if (error)
1144 return error;
1145 unlock = 1;
1146 }
1147
1148 generic_fillattr(inode, stat);
1149 if (unlock)
1150 gfs2_glock_dq_uninit(&gh);
1151
1152 return 0;
1153 }
1154
gfs2_setxattr(struct dentry * dentry,const char * name,const void * data,size_t size,int flags)1155 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1156 const void *data, size_t size, int flags)
1157 {
1158 struct inode *inode = dentry->d_inode;
1159 struct gfs2_ea_request er;
1160
1161 memset(&er, 0, sizeof(struct gfs2_ea_request));
1162 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1163 if (er.er_type == GFS2_EATYPE_UNUSED)
1164 return -EOPNOTSUPP;
1165 er.er_data = (char *)data;
1166 er.er_name_len = strlen(er.er_name);
1167 er.er_data_len = size;
1168 er.er_flags = flags;
1169
1170 gfs2_assert_warn(GFS2_SB(inode), !(er.er_flags & GFS2_ERF_MODE));
1171
1172 return gfs2_ea_set(GFS2_I(inode), &er);
1173 }
1174
gfs2_getxattr(struct dentry * dentry,const char * name,void * data,size_t size)1175 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1176 void *data, size_t size)
1177 {
1178 struct gfs2_ea_request er;
1179
1180 memset(&er, 0, sizeof(struct gfs2_ea_request));
1181 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1182 if (er.er_type == GFS2_EATYPE_UNUSED)
1183 return -EOPNOTSUPP;
1184 er.er_data = data;
1185 er.er_name_len = strlen(er.er_name);
1186 er.er_data_len = size;
1187
1188 return gfs2_ea_get(GFS2_I(dentry->d_inode), &er);
1189 }
1190
gfs2_listxattr(struct dentry * dentry,char * buffer,size_t size)1191 static ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
1192 {
1193 struct gfs2_ea_request er;
1194
1195 memset(&er, 0, sizeof(struct gfs2_ea_request));
1196 er.er_data = (size) ? buffer : NULL;
1197 er.er_data_len = size;
1198
1199 return gfs2_ea_list(GFS2_I(dentry->d_inode), &er);
1200 }
1201
gfs2_removexattr(struct dentry * dentry,const char * name)1202 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1203 {
1204 struct gfs2_ea_request er;
1205
1206 memset(&er, 0, sizeof(struct gfs2_ea_request));
1207 er.er_type = gfs2_ea_name2type(name, &er.er_name);
1208 if (er.er_type == GFS2_EATYPE_UNUSED)
1209 return -EOPNOTSUPP;
1210 er.er_name_len = strlen(er.er_name);
1211
1212 return gfs2_ea_remove(GFS2_I(dentry->d_inode), &er);
1213 }
1214
gfs2_fiemap(struct inode * inode,struct fiemap_extent_info * fieinfo,u64 start,u64 len)1215 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1216 u64 start, u64 len)
1217 {
1218 struct gfs2_inode *ip = GFS2_I(inode);
1219 struct gfs2_holder gh;
1220 int ret;
1221
1222 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1223 if (ret)
1224 return ret;
1225
1226 mutex_lock(&inode->i_mutex);
1227
1228 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1229 if (ret)
1230 goto out;
1231
1232 if (gfs2_is_stuffed(ip)) {
1233 u64 phys = ip->i_no_addr << inode->i_blkbits;
1234 u64 size = i_size_read(inode);
1235 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1236 FIEMAP_EXTENT_DATA_INLINE;
1237 phys += sizeof(struct gfs2_dinode);
1238 phys += start;
1239 if (start + len > size)
1240 len = size - start;
1241 if (start < size)
1242 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1243 len, flags);
1244 if (ret == 1)
1245 ret = 0;
1246 } else {
1247 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1248 gfs2_block_map);
1249 }
1250
1251 gfs2_glock_dq_uninit(&gh);
1252 out:
1253 mutex_unlock(&inode->i_mutex);
1254 return ret;
1255 }
1256
1257 const struct inode_operations gfs2_file_iops = {
1258 .permission = gfs2_permission,
1259 .setattr = gfs2_setattr,
1260 .getattr = gfs2_getattr,
1261 .setxattr = gfs2_setxattr,
1262 .getxattr = gfs2_getxattr,
1263 .listxattr = gfs2_listxattr,
1264 .removexattr = gfs2_removexattr,
1265 .fiemap = gfs2_fiemap,
1266 };
1267
1268 const struct inode_operations gfs2_dir_iops = {
1269 .create = gfs2_create,
1270 .lookup = gfs2_lookup,
1271 .link = gfs2_link,
1272 .unlink = gfs2_unlink,
1273 .symlink = gfs2_symlink,
1274 .mkdir = gfs2_mkdir,
1275 .rmdir = gfs2_rmdir,
1276 .mknod = gfs2_mknod,
1277 .rename = gfs2_rename,
1278 .permission = gfs2_permission,
1279 .setattr = gfs2_setattr,
1280 .getattr = gfs2_getattr,
1281 .setxattr = gfs2_setxattr,
1282 .getxattr = gfs2_getxattr,
1283 .listxattr = gfs2_listxattr,
1284 .removexattr = gfs2_removexattr,
1285 .fiemap = gfs2_fiemap,
1286 };
1287
1288 const struct inode_operations gfs2_symlink_iops = {
1289 .readlink = gfs2_readlink,
1290 .follow_link = gfs2_follow_link,
1291 .permission = gfs2_permission,
1292 .setattr = gfs2_setattr,
1293 .getattr = gfs2_getattr,
1294 .setxattr = gfs2_setxattr,
1295 .getxattr = gfs2_getxattr,
1296 .listxattr = gfs2_listxattr,
1297 .removexattr = gfs2_removexattr,
1298 .fiemap = gfs2_fiemap,
1299 };
1300
1301