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make the feature checks in ->fallocate future proof
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / ops_inode.c
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/namei.h>
15 #include <linux/mm.h>
16 #include <linux/xattr.h>
17 #include <linux/posix_acl.h>
18 #include <linux/gfs2_ondisk.h>
19 #include <linux/crc32.h>
20 #include <linux/fiemap.h>
21 #include <linux/swap.h>
22 #include <linux/falloc.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 "xattr.h"
31 #include "glock.h"
32 #include "inode.h"
33 #include "meta_io.h"
34 #include "quota.h"
35 #include "rgrp.h"
36 #include "trans.h"
37 #include "util.h"
38 #include "super.h"
39
40 /**
41 * gfs2_create - Create a file
42 * @dir: The directory in which to create the file
43 * @dentry: The dentry of the new file
44 * @mode: The mode of the new file
45 *
46 * Returns: errno
47 */
48
49 static int gfs2_create(struct inode *dir, struct dentry *dentry,
50 int mode, struct nameidata *nd)
51 {
52 struct gfs2_inode *dip = GFS2_I(dir);
53 struct gfs2_sbd *sdp = GFS2_SB(dir);
54 struct gfs2_holder ghs[2];
55 struct inode *inode;
56
57 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
58
59 for (;;) {
60 inode = gfs2_createi(ghs, &dentry->d_name, S_IFREG | mode, 0);
61 if (!IS_ERR(inode)) {
62 gfs2_trans_end(sdp);
63 if (dip->i_alloc->al_rgd)
64 gfs2_inplace_release(dip);
65 gfs2_quota_unlock(dip);
66 gfs2_alloc_put(dip);
67 gfs2_glock_dq_uninit_m(2, ghs);
68 mark_inode_dirty(inode);
69 break;
70 } else if (PTR_ERR(inode) != -EEXIST ||
71 (nd && nd->flags & LOOKUP_EXCL)) {
72 gfs2_holder_uninit(ghs);
73 return PTR_ERR(inode);
74 }
75
76 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
77 if (inode) {
78 if (!IS_ERR(inode)) {
79 gfs2_holder_uninit(ghs);
80 break;
81 } else {
82 gfs2_holder_uninit(ghs);
83 return PTR_ERR(inode);
84 }
85 }
86 }
87
88 d_instantiate(dentry, inode);
89
90 return 0;
91 }
92
93 /**
94 * gfs2_lookup - Look up a filename in a directory and return its inode
95 * @dir: The directory inode
96 * @dentry: The dentry of the new inode
97 * @nd: passed from Linux VFS, ignored by us
98 *
99 * Called by the VFS layer. Lock dir and call gfs2_lookupi()
100 *
101 * Returns: errno
102 */
103
104 static struct dentry *gfs2_lookup(struct inode *dir, struct dentry *dentry,
105 struct nameidata *nd)
106 {
107 struct inode *inode = NULL;
108
109 inode = gfs2_lookupi(dir, &dentry->d_name, 0);
110 if (inode && IS_ERR(inode))
111 return ERR_CAST(inode);
112
113 if (inode) {
114 struct gfs2_glock *gl = GFS2_I(inode)->i_gl;
115 struct gfs2_holder gh;
116 int error;
117 error = gfs2_glock_nq_init(gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
118 if (error) {
119 iput(inode);
120 return ERR_PTR(error);
121 }
122 gfs2_glock_dq_uninit(&gh);
123 return d_splice_alias(inode, dentry);
124 }
125 d_add(dentry, inode);
126
127 return NULL;
128 }
129
130 /**
131 * gfs2_link - Link to a file
132 * @old_dentry: The inode to link
133 * @dir: Add link to this directory
134 * @dentry: The name of the link
135 *
136 * Link the inode in "old_dentry" into the directory "dir" with the
137 * name in "dentry".
138 *
139 * Returns: errno
140 */
141
142 static int gfs2_link(struct dentry *old_dentry, struct inode *dir,
143 struct dentry *dentry)
144 {
145 struct gfs2_inode *dip = GFS2_I(dir);
146 struct gfs2_sbd *sdp = GFS2_SB(dir);
147 struct inode *inode = old_dentry->d_inode;
148 struct gfs2_inode *ip = GFS2_I(inode);
149 struct gfs2_holder ghs[2];
150 int alloc_required;
151 int error;
152
153 if (S_ISDIR(inode->i_mode))
154 return -EPERM;
155
156 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
157 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
158
159 error = gfs2_glock_nq(ghs); /* parent */
160 if (error)
161 goto out_parent;
162
163 error = gfs2_glock_nq(ghs + 1); /* child */
164 if (error)
165 goto out_child;
166
167 error = gfs2_permission(dir, MAY_WRITE | MAY_EXEC, 0);
168 if (error)
169 goto out_gunlock;
170
171 error = gfs2_dir_check(dir, &dentry->d_name, NULL);
172 switch (error) {
173 case -ENOENT:
174 break;
175 case 0:
176 error = -EEXIST;
177 default:
178 goto out_gunlock;
179 }
180
181 error = -EINVAL;
182 if (!dip->i_inode.i_nlink)
183 goto out_gunlock;
184 error = -EFBIG;
185 if (dip->i_entries == (u32)-1)
186 goto out_gunlock;
187 error = -EPERM;
188 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
189 goto out_gunlock;
190 error = -EINVAL;
191 if (!ip->i_inode.i_nlink)
192 goto out_gunlock;
193 error = -EMLINK;
194 if (ip->i_inode.i_nlink == (u32)-1)
195 goto out_gunlock;
196
197 alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name);
198 if (error < 0)
199 goto out_gunlock;
200 error = 0;
201
202 if (alloc_required) {
203 struct gfs2_alloc *al = gfs2_alloc_get(dip);
204 if (!al) {
205 error = -ENOMEM;
206 goto out_gunlock;
207 }
208
209 error = gfs2_quota_lock_check(dip);
210 if (error)
211 goto out_alloc;
212
213 al->al_requested = sdp->sd_max_dirres;
214
215 error = gfs2_inplace_reserve(dip);
216 if (error)
217 goto out_gunlock_q;
218
219 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
220 gfs2_rg_blocks(al) +
221 2 * RES_DINODE + RES_STATFS +
222 RES_QUOTA, 0);
223 if (error)
224 goto out_ipres;
225 } else {
226 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0);
227 if (error)
228 goto out_ipres;
229 }
230
231 error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode));
232 if (error)
233 goto out_end_trans;
234
235 error = gfs2_change_nlink(ip, +1);
236
237 out_end_trans:
238 gfs2_trans_end(sdp);
239 out_ipres:
240 if (alloc_required)
241 gfs2_inplace_release(dip);
242 out_gunlock_q:
243 if (alloc_required)
244 gfs2_quota_unlock(dip);
245 out_alloc:
246 if (alloc_required)
247 gfs2_alloc_put(dip);
248 out_gunlock:
249 gfs2_glock_dq(ghs + 1);
250 out_child:
251 gfs2_glock_dq(ghs);
252 out_parent:
253 gfs2_holder_uninit(ghs);
254 gfs2_holder_uninit(ghs + 1);
255 if (!error) {
256 ihold(inode);
257 d_instantiate(dentry, inode);
258 mark_inode_dirty(inode);
259 }
260 return error;
261 }
262
263 /*
264 * gfs2_unlink_ok - check to see that a inode is still in a directory
265 * @dip: the directory
266 * @name: the name of the file
267 * @ip: the inode
268 *
269 * Assumes that the lock on (at least) @dip is held.
270 *
271 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
272 */
273
274 static int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name,
275 const struct gfs2_inode *ip)
276 {
277 int error;
278
279 if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode))
280 return -EPERM;
281
282 if ((dip->i_inode.i_mode & S_ISVTX) &&
283 dip->i_inode.i_uid != current_fsuid() &&
284 ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER))
285 return -EPERM;
286
287 if (IS_APPEND(&dip->i_inode))
288 return -EPERM;
289
290 error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC, 0);
291 if (error)
292 return error;
293
294 error = gfs2_dir_check(&dip->i_inode, name, ip);
295 if (error)
296 return error;
297
298 return 0;
299 }
300
301 /**
302 * gfs2_unlink - Unlink a file
303 * @dir: The inode of the directory containing the file to unlink
304 * @dentry: The file itself
305 *
306 * Unlink a file. Call gfs2_unlinki()
307 *
308 * Returns: errno
309 */
310
311 static int gfs2_unlink(struct inode *dir, struct dentry *dentry)
312 {
313 struct gfs2_inode *dip = GFS2_I(dir);
314 struct gfs2_sbd *sdp = GFS2_SB(dir);
315 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
316 struct gfs2_holder ghs[3];
317 struct gfs2_rgrpd *rgd;
318 struct gfs2_holder ri_gh;
319 int error;
320
321 error = gfs2_rindex_hold(sdp, &ri_gh);
322 if (error)
323 return error;
324
325 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
326 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
327
328 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
329 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
330
331
332 error = gfs2_glock_nq(ghs); /* parent */
333 if (error)
334 goto out_parent;
335
336 error = gfs2_glock_nq(ghs + 1); /* child */
337 if (error)
338 goto out_child;
339
340 error = gfs2_glock_nq(ghs + 2); /* rgrp */
341 if (error)
342 goto out_rgrp;
343
344 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
345 if (error)
346 goto out_gunlock;
347
348 error = gfs2_trans_begin(sdp, 2*RES_DINODE + RES_LEAF + RES_RG_BIT, 0);
349 if (error)
350 goto out_gunlock;
351
352 error = gfs2_dir_del(dip, &dentry->d_name);
353 if (error)
354 goto out_end_trans;
355
356 error = gfs2_change_nlink(ip, -1);
357
358 out_end_trans:
359 gfs2_trans_end(sdp);
360 out_gunlock:
361 gfs2_glock_dq(ghs + 2);
362 out_rgrp:
363 gfs2_holder_uninit(ghs + 2);
364 gfs2_glock_dq(ghs + 1);
365 out_child:
366 gfs2_holder_uninit(ghs + 1);
367 gfs2_glock_dq(ghs);
368 out_parent:
369 gfs2_holder_uninit(ghs);
370 gfs2_glock_dq_uninit(&ri_gh);
371 return error;
372 }
373
374 /**
375 * gfs2_symlink - Create a symlink
376 * @dir: The directory to create the symlink in
377 * @dentry: The dentry to put the symlink in
378 * @symname: The thing which the link points to
379 *
380 * Returns: errno
381 */
382
383 static int gfs2_symlink(struct inode *dir, struct dentry *dentry,
384 const char *symname)
385 {
386 struct gfs2_inode *dip = GFS2_I(dir), *ip;
387 struct gfs2_sbd *sdp = GFS2_SB(dir);
388 struct gfs2_holder ghs[2];
389 struct inode *inode;
390 struct buffer_head *dibh;
391 int size;
392 int error;
393
394 /* Must be stuffed with a null terminator for gfs2_follow_link() */
395 size = strlen(symname);
396 if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode) - 1)
397 return -ENAMETOOLONG;
398
399 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
400
401 inode = gfs2_createi(ghs, &dentry->d_name, S_IFLNK | S_IRWXUGO, 0);
402 if (IS_ERR(inode)) {
403 gfs2_holder_uninit(ghs);
404 return PTR_ERR(inode);
405 }
406
407 ip = ghs[1].gh_gl->gl_object;
408
409 i_size_write(inode, size);
410
411 error = gfs2_meta_inode_buffer(ip, &dibh);
412
413 if (!gfs2_assert_withdraw(sdp, !error)) {
414 gfs2_dinode_out(ip, dibh->b_data);
415 memcpy(dibh->b_data + sizeof(struct gfs2_dinode), symname,
416 size);
417 brelse(dibh);
418 }
419
420 gfs2_trans_end(sdp);
421 if (dip->i_alloc->al_rgd)
422 gfs2_inplace_release(dip);
423 gfs2_quota_unlock(dip);
424 gfs2_alloc_put(dip);
425
426 gfs2_glock_dq_uninit_m(2, ghs);
427
428 d_instantiate(dentry, inode);
429 mark_inode_dirty(inode);
430
431 return 0;
432 }
433
434 /**
435 * gfs2_mkdir - Make a directory
436 * @dir: The parent directory of the new one
437 * @dentry: The dentry of the new directory
438 * @mode: The mode of the new directory
439 *
440 * Returns: errno
441 */
442
443 static int gfs2_mkdir(struct inode *dir, struct dentry *dentry, int mode)
444 {
445 struct gfs2_inode *dip = GFS2_I(dir), *ip;
446 struct gfs2_sbd *sdp = GFS2_SB(dir);
447 struct gfs2_holder ghs[2];
448 struct inode *inode;
449 struct buffer_head *dibh;
450 int error;
451
452 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
453
454 inode = gfs2_createi(ghs, &dentry->d_name, S_IFDIR | mode, 0);
455 if (IS_ERR(inode)) {
456 gfs2_holder_uninit(ghs);
457 return PTR_ERR(inode);
458 }
459
460 ip = ghs[1].gh_gl->gl_object;
461
462 ip->i_inode.i_nlink = 2;
463 i_size_write(inode, sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode));
464 ip->i_diskflags |= GFS2_DIF_JDATA;
465 ip->i_entries = 2;
466
467 error = gfs2_meta_inode_buffer(ip, &dibh);
468
469 if (!gfs2_assert_withdraw(sdp, !error)) {
470 struct gfs2_dinode *di = (struct gfs2_dinode *)dibh->b_data;
471 struct gfs2_dirent *dent = (struct gfs2_dirent *)(di+1);
472
473 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
474 gfs2_qstr2dirent(&gfs2_qdot, GFS2_DIRENT_SIZE(gfs2_qdot.len), dent);
475 dent->de_inum = di->di_num; /* already GFS2 endian */
476 dent->de_type = cpu_to_be16(DT_DIR);
477 di->di_entries = cpu_to_be32(1);
478
479 dent = (struct gfs2_dirent *)((char*)dent + GFS2_DIRENT_SIZE(1));
480 gfs2_qstr2dirent(&gfs2_qdotdot, dibh->b_size - GFS2_DIRENT_SIZE(1) - sizeof(struct gfs2_dinode), dent);
481
482 gfs2_inum_out(dip, dent);
483 dent->de_type = cpu_to_be16(DT_DIR);
484
485 gfs2_dinode_out(ip, di);
486
487 brelse(dibh);
488 }
489
490 error = gfs2_change_nlink(dip, +1);
491 gfs2_assert_withdraw(sdp, !error); /* dip already pinned */
492
493 gfs2_trans_end(sdp);
494 if (dip->i_alloc->al_rgd)
495 gfs2_inplace_release(dip);
496 gfs2_quota_unlock(dip);
497 gfs2_alloc_put(dip);
498
499 gfs2_glock_dq_uninit_m(2, ghs);
500
501 d_instantiate(dentry, inode);
502 mark_inode_dirty(inode);
503
504 return 0;
505 }
506
507 /**
508 * gfs2_rmdiri - Remove a directory
509 * @dip: The parent directory of the directory to be removed
510 * @name: The name of the directory to be removed
511 * @ip: The GFS2 inode of the directory to be removed
512 *
513 * Assumes Glocks on dip and ip are held
514 *
515 * Returns: errno
516 */
517
518 static int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name,
519 struct gfs2_inode *ip)
520 {
521 int error;
522
523 if (ip->i_entries != 2) {
524 if (gfs2_consist_inode(ip))
525 gfs2_dinode_print(ip);
526 return -EIO;
527 }
528
529 error = gfs2_dir_del(dip, name);
530 if (error)
531 return error;
532
533 error = gfs2_change_nlink(dip, -1);
534 if (error)
535 return error;
536
537 error = gfs2_dir_del(ip, &gfs2_qdot);
538 if (error)
539 return error;
540
541 error = gfs2_dir_del(ip, &gfs2_qdotdot);
542 if (error)
543 return error;
544
545 /* It looks odd, but it really should be done twice */
546 error = gfs2_change_nlink(ip, -1);
547 if (error)
548 return error;
549
550 error = gfs2_change_nlink(ip, -1);
551 if (error)
552 return error;
553
554 return error;
555 }
556
557 /**
558 * gfs2_rmdir - Remove a directory
559 * @dir: The parent directory of the directory to be removed
560 * @dentry: The dentry of the directory to remove
561 *
562 * Remove a directory. Call gfs2_rmdiri()
563 *
564 * Returns: errno
565 */
566
567 static int gfs2_rmdir(struct inode *dir, struct dentry *dentry)
568 {
569 struct gfs2_inode *dip = GFS2_I(dir);
570 struct gfs2_sbd *sdp = GFS2_SB(dir);
571 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
572 struct gfs2_holder ghs[3];
573 struct gfs2_rgrpd *rgd;
574 struct gfs2_holder ri_gh;
575 int error;
576
577 error = gfs2_rindex_hold(sdp, &ri_gh);
578 if (error)
579 return error;
580 gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
581 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1);
582
583 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr);
584 gfs2_holder_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + 2);
585
586 error = gfs2_glock_nq(ghs); /* parent */
587 if (error)
588 goto out_parent;
589
590 error = gfs2_glock_nq(ghs + 1); /* child */
591 if (error)
592 goto out_child;
593
594 error = gfs2_glock_nq(ghs + 2); /* rgrp */
595 if (error)
596 goto out_rgrp;
597
598 error = gfs2_unlink_ok(dip, &dentry->d_name, ip);
599 if (error)
600 goto out_gunlock;
601
602 if (ip->i_entries < 2) {
603 if (gfs2_consist_inode(ip))
604 gfs2_dinode_print(ip);
605 error = -EIO;
606 goto out_gunlock;
607 }
608 if (ip->i_entries > 2) {
609 error = -ENOTEMPTY;
610 goto out_gunlock;
611 }
612
613 error = gfs2_trans_begin(sdp, 2 * RES_DINODE + 3 * RES_LEAF + RES_RG_BIT, 0);
614 if (error)
615 goto out_gunlock;
616
617 error = gfs2_rmdiri(dip, &dentry->d_name, ip);
618
619 gfs2_trans_end(sdp);
620
621 out_gunlock:
622 gfs2_glock_dq(ghs + 2);
623 out_rgrp:
624 gfs2_holder_uninit(ghs + 2);
625 gfs2_glock_dq(ghs + 1);
626 out_child:
627 gfs2_holder_uninit(ghs + 1);
628 gfs2_glock_dq(ghs);
629 out_parent:
630 gfs2_holder_uninit(ghs);
631 gfs2_glock_dq_uninit(&ri_gh);
632 return error;
633 }
634
635 /**
636 * gfs2_mknod - Make a special file
637 * @dir: The directory in which the special file will reside
638 * @dentry: The dentry of the special file
639 * @mode: The mode of the special file
640 * @rdev: The device specification of the special file
641 *
642 */
643
644 static int gfs2_mknod(struct inode *dir, struct dentry *dentry, int mode,
645 dev_t dev)
646 {
647 struct gfs2_inode *dip = GFS2_I(dir);
648 struct gfs2_sbd *sdp = GFS2_SB(dir);
649 struct gfs2_holder ghs[2];
650 struct inode *inode;
651
652 gfs2_holder_init(dip->i_gl, 0, 0, ghs);
653
654 inode = gfs2_createi(ghs, &dentry->d_name, mode, dev);
655 if (IS_ERR(inode)) {
656 gfs2_holder_uninit(ghs);
657 return PTR_ERR(inode);
658 }
659
660 gfs2_trans_end(sdp);
661 if (dip->i_alloc->al_rgd)
662 gfs2_inplace_release(dip);
663 gfs2_quota_unlock(dip);
664 gfs2_alloc_put(dip);
665
666 gfs2_glock_dq_uninit_m(2, ghs);
667
668 d_instantiate(dentry, inode);
669 mark_inode_dirty(inode);
670
671 return 0;
672 }
673
674 /*
675 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
676 * @this: move this
677 * @to: to here
678 *
679 * Follow @to back to the root and make sure we don't encounter @this
680 * Assumes we already hold the rename lock.
681 *
682 * Returns: errno
683 */
684
685 static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
686 {
687 struct inode *dir = &to->i_inode;
688 struct super_block *sb = dir->i_sb;
689 struct inode *tmp;
690 int error = 0;
691
692 igrab(dir);
693
694 for (;;) {
695 if (dir == &this->i_inode) {
696 error = -EINVAL;
697 break;
698 }
699 if (dir == sb->s_root->d_inode) {
700 error = 0;
701 break;
702 }
703
704 tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
705 if (IS_ERR(tmp)) {
706 error = PTR_ERR(tmp);
707 break;
708 }
709
710 iput(dir);
711 dir = tmp;
712 }
713
714 iput(dir);
715
716 return error;
717 }
718
719 /**
720 * gfs2_rename - Rename a file
721 * @odir: Parent directory of old file name
722 * @odentry: The old dentry of the file
723 * @ndir: Parent directory of new file name
724 * @ndentry: The new dentry of the file
725 *
726 * Returns: errno
727 */
728
729 static int gfs2_rename(struct inode *odir, struct dentry *odentry,
730 struct inode *ndir, struct dentry *ndentry)
731 {
732 struct gfs2_inode *odip = GFS2_I(odir);
733 struct gfs2_inode *ndip = GFS2_I(ndir);
734 struct gfs2_inode *ip = GFS2_I(odentry->d_inode);
735 struct gfs2_inode *nip = NULL;
736 struct gfs2_sbd *sdp = GFS2_SB(odir);
737 struct gfs2_holder ghs[5], r_gh = { .gh_gl = NULL, }, ri_gh;
738 struct gfs2_rgrpd *nrgd;
739 unsigned int num_gh;
740 int dir_rename = 0;
741 int alloc_required = 0;
742 unsigned int x;
743 int error;
744
745 if (ndentry->d_inode) {
746 nip = GFS2_I(ndentry->d_inode);
747 if (ip == nip)
748 return 0;
749 }
750
751 error = gfs2_rindex_hold(sdp, &ri_gh);
752 if (error)
753 return error;
754
755 if (odip != ndip) {
756 error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE,
757 0, &r_gh);
758 if (error)
759 goto out;
760
761 if (S_ISDIR(ip->i_inode.i_mode)) {
762 dir_rename = 1;
763 /* don't move a dirctory into it's subdir */
764 error = gfs2_ok_to_move(ip, ndip);
765 if (error)
766 goto out_gunlock_r;
767 }
768 }
769
770 num_gh = 1;
771 gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs);
772 if (odip != ndip) {
773 gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
774 num_gh++;
775 }
776 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
777 num_gh++;
778
779 if (nip) {
780 gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh);
781 num_gh++;
782 /* grab the resource lock for unlink flag twiddling
783 * this is the case of the target file already existing
784 * so we unlink before doing the rename
785 */
786 nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr);
787 if (nrgd)
788 gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++);
789 }
790
791 for (x = 0; x < num_gh; x++) {
792 error = gfs2_glock_nq(ghs + x);
793 if (error)
794 goto out_gunlock;
795 }
796
797 /* Check out the old directory */
798
799 error = gfs2_unlink_ok(odip, &odentry->d_name, ip);
800 if (error)
801 goto out_gunlock;
802
803 /* Check out the new directory */
804
805 if (nip) {
806 error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip);
807 if (error)
808 goto out_gunlock;
809
810 if (S_ISDIR(nip->i_inode.i_mode)) {
811 if (nip->i_entries < 2) {
812 if (gfs2_consist_inode(nip))
813 gfs2_dinode_print(nip);
814 error = -EIO;
815 goto out_gunlock;
816 }
817 if (nip->i_entries > 2) {
818 error = -ENOTEMPTY;
819 goto out_gunlock;
820 }
821 }
822 } else {
823 error = gfs2_permission(ndir, MAY_WRITE | MAY_EXEC, 0);
824 if (error)
825 goto out_gunlock;
826
827 error = gfs2_dir_check(ndir, &ndentry->d_name, NULL);
828 switch (error) {
829 case -ENOENT:
830 error = 0;
831 break;
832 case 0:
833 error = -EEXIST;
834 default:
835 goto out_gunlock;
836 };
837
838 if (odip != ndip) {
839 if (!ndip->i_inode.i_nlink) {
840 error = -EINVAL;
841 goto out_gunlock;
842 }
843 if (ndip->i_entries == (u32)-1) {
844 error = -EFBIG;
845 goto out_gunlock;
846 }
847 if (S_ISDIR(ip->i_inode.i_mode) &&
848 ndip->i_inode.i_nlink == (u32)-1) {
849 error = -EMLINK;
850 goto out_gunlock;
851 }
852 }
853 }
854
855 /* Check out the dir to be renamed */
856
857 if (dir_rename) {
858 error = gfs2_permission(odentry->d_inode, MAY_WRITE, 0);
859 if (error)
860 goto out_gunlock;
861 }
862
863 if (nip == NULL)
864 alloc_required = gfs2_diradd_alloc_required(ndir, &ndentry->d_name);
865 error = alloc_required;
866 if (error < 0)
867 goto out_gunlock;
868 error = 0;
869
870 if (alloc_required) {
871 struct gfs2_alloc *al = gfs2_alloc_get(ndip);
872 if (!al) {
873 error = -ENOMEM;
874 goto out_gunlock;
875 }
876
877 error = gfs2_quota_lock_check(ndip);
878 if (error)
879 goto out_alloc;
880
881 al->al_requested = sdp->sd_max_dirres;
882
883 error = gfs2_inplace_reserve_ri(ndip);
884 if (error)
885 goto out_gunlock_q;
886
887 error = gfs2_trans_begin(sdp, sdp->sd_max_dirres +
888 gfs2_rg_blocks(al) +
889 4 * RES_DINODE + 4 * RES_LEAF +
890 RES_STATFS + RES_QUOTA + 4, 0);
891 if (error)
892 goto out_ipreserv;
893 } else {
894 error = gfs2_trans_begin(sdp, 4 * RES_DINODE +
895 5 * RES_LEAF + 4, 0);
896 if (error)
897 goto out_gunlock;
898 }
899
900 /* Remove the target file, if it exists */
901
902 if (nip) {
903 if (S_ISDIR(nip->i_inode.i_mode))
904 error = gfs2_rmdiri(ndip, &ndentry->d_name, nip);
905 else {
906 error = gfs2_dir_del(ndip, &ndentry->d_name);
907 if (error)
908 goto out_end_trans;
909 error = gfs2_change_nlink(nip, -1);
910 }
911 if (error)
912 goto out_end_trans;
913 }
914
915 if (dir_rename) {
916 error = gfs2_change_nlink(ndip, +1);
917 if (error)
918 goto out_end_trans;
919 error = gfs2_change_nlink(odip, -1);
920 if (error)
921 goto out_end_trans;
922
923 error = gfs2_dir_mvino(ip, &gfs2_qdotdot, ndip, DT_DIR);
924 if (error)
925 goto out_end_trans;
926 } else {
927 struct buffer_head *dibh;
928 error = gfs2_meta_inode_buffer(ip, &dibh);
929 if (error)
930 goto out_end_trans;
931 ip->i_inode.i_ctime = CURRENT_TIME;
932 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
933 gfs2_dinode_out(ip, dibh->b_data);
934 brelse(dibh);
935 }
936
937 error = gfs2_dir_del(odip, &odentry->d_name);
938 if (error)
939 goto out_end_trans;
940
941 error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode));
942 if (error)
943 goto out_end_trans;
944
945 out_end_trans:
946 gfs2_trans_end(sdp);
947 out_ipreserv:
948 if (alloc_required)
949 gfs2_inplace_release(ndip);
950 out_gunlock_q:
951 if (alloc_required)
952 gfs2_quota_unlock(ndip);
953 out_alloc:
954 if (alloc_required)
955 gfs2_alloc_put(ndip);
956 out_gunlock:
957 while (x--) {
958 gfs2_glock_dq(ghs + x);
959 gfs2_holder_uninit(ghs + x);
960 }
961 out_gunlock_r:
962 if (r_gh.gh_gl)
963 gfs2_glock_dq_uninit(&r_gh);
964 out:
965 gfs2_glock_dq_uninit(&ri_gh);
966 return error;
967 }
968
969 /**
970 * gfs2_follow_link - Follow a symbolic link
971 * @dentry: The dentry of the link
972 * @nd: Data that we pass to vfs_follow_link()
973 *
974 * This can handle symlinks of any size.
975 *
976 * Returns: 0 on success or error code
977 */
978
979 static void *gfs2_follow_link(struct dentry *dentry, struct nameidata *nd)
980 {
981 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
982 struct gfs2_holder i_gh;
983 struct buffer_head *dibh;
984 unsigned int x, size;
985 char *buf;
986 int error;
987
988 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
989 error = gfs2_glock_nq(&i_gh);
990 if (error) {
991 gfs2_holder_uninit(&i_gh);
992 nd_set_link(nd, ERR_PTR(error));
993 return NULL;
994 }
995
996 size = (unsigned int)i_size_read(&ip->i_inode);
997 if (size == 0) {
998 gfs2_consist_inode(ip);
999 buf = ERR_PTR(-EIO);
1000 goto out;
1001 }
1002
1003 error = gfs2_meta_inode_buffer(ip, &dibh);
1004 if (error) {
1005 buf = ERR_PTR(error);
1006 goto out;
1007 }
1008
1009 x = size + 1;
1010 buf = kmalloc(x, GFP_NOFS);
1011 if (!buf)
1012 buf = ERR_PTR(-ENOMEM);
1013 else
1014 memcpy(buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1015 brelse(dibh);
1016 out:
1017 gfs2_glock_dq_uninit(&i_gh);
1018 nd_set_link(nd, buf);
1019 return NULL;
1020 }
1021
1022 static void gfs2_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1023 {
1024 char *s = nd_get_link(nd);
1025 if (!IS_ERR(s))
1026 kfree(s);
1027 }
1028
1029 /**
1030 * gfs2_permission -
1031 * @inode:
1032 * @mask:
1033 * @nd: passed from Linux VFS, ignored by us
1034 *
1035 * This may be called from the VFS directly, or from within GFS2 with the
1036 * inode locked, so we look to see if the glock is already locked and only
1037 * lock the glock if its not already been done.
1038 *
1039 * Returns: errno
1040 */
1041
1042 int gfs2_permission(struct inode *inode, int mask, unsigned int flags)
1043 {
1044 struct gfs2_inode *ip;
1045 struct gfs2_holder i_gh;
1046 int error;
1047 int unlock = 0;
1048
1049 if (flags & IPERM_FLAG_RCU)
1050 return -ECHILD;
1051
1052 ip = GFS2_I(inode);
1053 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1054 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
1055 if (error)
1056 return error;
1057 unlock = 1;
1058 }
1059
1060 if ((mask & MAY_WRITE) && IS_IMMUTABLE(inode))
1061 error = -EACCES;
1062 else
1063 error = generic_permission(inode, mask, flags, gfs2_check_acl);
1064 if (unlock)
1065 gfs2_glock_dq_uninit(&i_gh);
1066
1067 return error;
1068 }
1069
1070 static int setattr_chown(struct inode *inode, struct iattr *attr)
1071 {
1072 struct gfs2_inode *ip = GFS2_I(inode);
1073 struct gfs2_sbd *sdp = GFS2_SB(inode);
1074 u32 ouid, ogid, nuid, ngid;
1075 int error;
1076
1077 ouid = inode->i_uid;
1078 ogid = inode->i_gid;
1079 nuid = attr->ia_uid;
1080 ngid = attr->ia_gid;
1081
1082 if (!(attr->ia_valid & ATTR_UID) || ouid == nuid)
1083 ouid = nuid = NO_QUOTA_CHANGE;
1084 if (!(attr->ia_valid & ATTR_GID) || ogid == ngid)
1085 ogid = ngid = NO_QUOTA_CHANGE;
1086
1087 if (!gfs2_alloc_get(ip))
1088 return -ENOMEM;
1089
1090 error = gfs2_quota_lock(ip, nuid, ngid);
1091 if (error)
1092 goto out_alloc;
1093
1094 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1095 error = gfs2_quota_check(ip, nuid, ngid);
1096 if (error)
1097 goto out_gunlock_q;
1098 }
1099
1100 error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0);
1101 if (error)
1102 goto out_gunlock_q;
1103
1104 error = gfs2_setattr_simple(ip, attr);
1105 if (error)
1106 goto out_end_trans;
1107
1108 if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) {
1109 u64 blocks = gfs2_get_inode_blocks(&ip->i_inode);
1110 gfs2_quota_change(ip, -blocks, ouid, ogid);
1111 gfs2_quota_change(ip, blocks, nuid, ngid);
1112 }
1113
1114 out_end_trans:
1115 gfs2_trans_end(sdp);
1116 out_gunlock_q:
1117 gfs2_quota_unlock(ip);
1118 out_alloc:
1119 gfs2_alloc_put(ip);
1120 return error;
1121 }
1122
1123 /**
1124 * gfs2_setattr - Change attributes on an inode
1125 * @dentry: The dentry which is changing
1126 * @attr: The structure describing the change
1127 *
1128 * The VFS layer wants to change one or more of an inodes attributes. Write
1129 * that change out to disk.
1130 *
1131 * Returns: errno
1132 */
1133
1134 static int gfs2_setattr(struct dentry *dentry, struct iattr *attr)
1135 {
1136 struct inode *inode = dentry->d_inode;
1137 struct gfs2_inode *ip = GFS2_I(inode);
1138 struct gfs2_holder i_gh;
1139 int error;
1140
1141 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
1142 if (error)
1143 return error;
1144
1145 error = -EPERM;
1146 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1147 goto out;
1148
1149 error = inode_change_ok(inode, attr);
1150 if (error)
1151 goto out;
1152
1153 if (attr->ia_valid & ATTR_SIZE)
1154 error = gfs2_setattr_size(inode, attr->ia_size);
1155 else if (attr->ia_valid & (ATTR_UID | ATTR_GID))
1156 error = setattr_chown(inode, attr);
1157 else if ((attr->ia_valid & ATTR_MODE) && IS_POSIXACL(inode))
1158 error = gfs2_acl_chmod(ip, attr);
1159 else
1160 error = gfs2_setattr_simple(ip, attr);
1161
1162 out:
1163 gfs2_glock_dq_uninit(&i_gh);
1164 if (!error)
1165 mark_inode_dirty(inode);
1166 return error;
1167 }
1168
1169 /**
1170 * gfs2_getattr - Read out an inode's attributes
1171 * @mnt: The vfsmount the inode is being accessed from
1172 * @dentry: The dentry to stat
1173 * @stat: The inode's stats
1174 *
1175 * This may be called from the VFS directly, or from within GFS2 with the
1176 * inode locked, so we look to see if the glock is already locked and only
1177 * lock the glock if its not already been done. Note that its the NFS
1178 * readdirplus operation which causes this to be called (from filldir)
1179 * with the glock already held.
1180 *
1181 * Returns: errno
1182 */
1183
1184 static int gfs2_getattr(struct vfsmount *mnt, struct dentry *dentry,
1185 struct kstat *stat)
1186 {
1187 struct inode *inode = dentry->d_inode;
1188 struct gfs2_inode *ip = GFS2_I(inode);
1189 struct gfs2_holder gh;
1190 int error;
1191 int unlock = 0;
1192
1193 if (gfs2_glock_is_locked_by_me(ip->i_gl) == NULL) {
1194 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1195 if (error)
1196 return error;
1197 unlock = 1;
1198 }
1199
1200 generic_fillattr(inode, stat);
1201 if (unlock)
1202 gfs2_glock_dq_uninit(&gh);
1203
1204 return 0;
1205 }
1206
1207 static int gfs2_setxattr(struct dentry *dentry, const char *name,
1208 const void *data, size_t size, int flags)
1209 {
1210 struct inode *inode = dentry->d_inode;
1211 struct gfs2_inode *ip = GFS2_I(inode);
1212 struct gfs2_holder gh;
1213 int ret;
1214
1215 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1216 ret = gfs2_glock_nq(&gh);
1217 if (ret == 0) {
1218 ret = generic_setxattr(dentry, name, data, size, flags);
1219 gfs2_glock_dq(&gh);
1220 }
1221 gfs2_holder_uninit(&gh);
1222 return ret;
1223 }
1224
1225 static ssize_t gfs2_getxattr(struct dentry *dentry, const char *name,
1226 void *data, size_t size)
1227 {
1228 struct inode *inode = dentry->d_inode;
1229 struct gfs2_inode *ip = GFS2_I(inode);
1230 struct gfs2_holder gh;
1231 int ret;
1232
1233 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
1234 ret = gfs2_glock_nq(&gh);
1235 if (ret == 0) {
1236 ret = generic_getxattr(dentry, name, data, size);
1237 gfs2_glock_dq(&gh);
1238 }
1239 gfs2_holder_uninit(&gh);
1240 return ret;
1241 }
1242
1243 static int gfs2_removexattr(struct dentry *dentry, const char *name)
1244 {
1245 struct inode *inode = dentry->d_inode;
1246 struct gfs2_inode *ip = GFS2_I(inode);
1247 struct gfs2_holder gh;
1248 int ret;
1249
1250 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1251 ret = gfs2_glock_nq(&gh);
1252 if (ret == 0) {
1253 ret = generic_removexattr(dentry, name);
1254 gfs2_glock_dq(&gh);
1255 }
1256 gfs2_holder_uninit(&gh);
1257 return ret;
1258 }
1259
1260 static void empty_write_end(struct page *page, unsigned from,
1261 unsigned to)
1262 {
1263 struct gfs2_inode *ip = GFS2_I(page->mapping->host);
1264
1265 page_zero_new_buffers(page, from, to);
1266 flush_dcache_page(page);
1267 mark_page_accessed(page);
1268
1269 if (!gfs2_is_writeback(ip))
1270 gfs2_page_add_databufs(ip, page, from, to);
1271
1272 block_commit_write(page, from, to);
1273 }
1274
1275
1276 static int write_empty_blocks(struct page *page, unsigned from, unsigned to)
1277 {
1278 unsigned start, end, next;
1279 struct buffer_head *bh, *head;
1280 int error;
1281
1282 if (!page_has_buffers(page)) {
1283 error = __block_write_begin(page, from, to - from, gfs2_block_map);
1284 if (unlikely(error))
1285 return error;
1286
1287 empty_write_end(page, from, to);
1288 return 0;
1289 }
1290
1291 bh = head = page_buffers(page);
1292 next = end = 0;
1293 while (next < from) {
1294 next += bh->b_size;
1295 bh = bh->b_this_page;
1296 }
1297 start = next;
1298 do {
1299 next += bh->b_size;
1300 if (buffer_mapped(bh)) {
1301 if (end) {
1302 error = __block_write_begin(page, start, end - start,
1303 gfs2_block_map);
1304 if (unlikely(error))
1305 return error;
1306 empty_write_end(page, start, end);
1307 end = 0;
1308 }
1309 start = next;
1310 }
1311 else
1312 end = next;
1313 bh = bh->b_this_page;
1314 } while (next < to);
1315
1316 if (end) {
1317 error = __block_write_begin(page, start, end - start, gfs2_block_map);
1318 if (unlikely(error))
1319 return error;
1320 empty_write_end(page, start, end);
1321 }
1322
1323 return 0;
1324 }
1325
1326 static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
1327 int mode)
1328 {
1329 struct gfs2_inode *ip = GFS2_I(inode);
1330 struct buffer_head *dibh;
1331 int error;
1332 u64 start = offset >> PAGE_CACHE_SHIFT;
1333 unsigned int start_offset = offset & ~PAGE_CACHE_MASK;
1334 u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
1335 pgoff_t curr;
1336 struct page *page;
1337 unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK;
1338 unsigned int from, to;
1339
1340 if (!end_offset)
1341 end_offset = PAGE_CACHE_SIZE;
1342
1343 error = gfs2_meta_inode_buffer(ip, &dibh);
1344 if (unlikely(error))
1345 goto out;
1346
1347 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1348
1349 if (gfs2_is_stuffed(ip)) {
1350 error = gfs2_unstuff_dinode(ip, NULL);
1351 if (unlikely(error))
1352 goto out;
1353 }
1354
1355 curr = start;
1356 offset = start << PAGE_CACHE_SHIFT;
1357 from = start_offset;
1358 to = PAGE_CACHE_SIZE;
1359 while (curr <= end) {
1360 page = grab_cache_page_write_begin(inode->i_mapping, curr,
1361 AOP_FLAG_NOFS);
1362 if (unlikely(!page)) {
1363 error = -ENOMEM;
1364 goto out;
1365 }
1366
1367 if (curr == end)
1368 to = end_offset;
1369 error = write_empty_blocks(page, from, to);
1370 if (!error && offset + to > inode->i_size &&
1371 !(mode & FALLOC_FL_KEEP_SIZE)) {
1372 i_size_write(inode, offset + to);
1373 }
1374 unlock_page(page);
1375 page_cache_release(page);
1376 if (error)
1377 goto out;
1378 curr++;
1379 offset += PAGE_CACHE_SIZE;
1380 from = 0;
1381 }
1382
1383 gfs2_dinode_out(ip, dibh->b_data);
1384 mark_inode_dirty(inode);
1385
1386 brelse(dibh);
1387
1388 out:
1389 return error;
1390 }
1391
1392 static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
1393 unsigned int *data_blocks, unsigned int *ind_blocks)
1394 {
1395 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1396 unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
1397 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
1398
1399 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
1400 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
1401 max_data -= tmp;
1402 }
1403 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
1404 so it might end up with fewer data blocks */
1405 if (max_data <= *data_blocks)
1406 return;
1407 *data_blocks = max_data;
1408 *ind_blocks = max_blocks - max_data;
1409 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
1410 if (*len > max) {
1411 *len = max;
1412 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
1413 }
1414 }
1415
1416 static long gfs2_fallocate(struct inode *inode, int mode, loff_t offset,
1417 loff_t len)
1418 {
1419 struct gfs2_sbd *sdp = GFS2_SB(inode);
1420 struct gfs2_inode *ip = GFS2_I(inode);
1421 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
1422 loff_t bytes, max_bytes;
1423 struct gfs2_alloc *al;
1424 int error;
1425 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
1426 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
1427
1428 /* We only support the FALLOC_FL_KEEP_SIZE mode */
1429 if (mode & ~FALLOC_FL_KEEP_SIZE)
1430 return -EOPNOTSUPP;
1431
1432 offset = (offset >> sdp->sd_sb.sb_bsize_shift) <<
1433 sdp->sd_sb.sb_bsize_shift;
1434
1435 len = next - offset;
1436 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
1437 if (!bytes)
1438 bytes = UINT_MAX;
1439
1440 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
1441 error = gfs2_glock_nq(&ip->i_gh);
1442 if (unlikely(error))
1443 goto out_uninit;
1444
1445 if (!gfs2_write_alloc_required(ip, offset, len))
1446 goto out_unlock;
1447
1448 while (len > 0) {
1449 if (len < bytes)
1450 bytes = len;
1451 al = gfs2_alloc_get(ip);
1452 if (!al) {
1453 error = -ENOMEM;
1454 goto out_unlock;
1455 }
1456
1457 error = gfs2_quota_lock_check(ip);
1458 if (error)
1459 goto out_alloc_put;
1460
1461 retry:
1462 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
1463
1464 al->al_requested = data_blocks + ind_blocks;
1465 error = gfs2_inplace_reserve(ip);
1466 if (error) {
1467 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
1468 bytes >>= 1;
1469 goto retry;
1470 }
1471 goto out_qunlock;
1472 }
1473 max_bytes = bytes;
1474 calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks);
1475 al->al_requested = data_blocks + ind_blocks;
1476
1477 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
1478 RES_RG_HDR + gfs2_rg_blocks(al);
1479 if (gfs2_is_jdata(ip))
1480 rblocks += data_blocks ? data_blocks : 1;
1481
1482 error = gfs2_trans_begin(sdp, rblocks,
1483 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
1484 if (error)
1485 goto out_trans_fail;
1486
1487 error = fallocate_chunk(inode, offset, max_bytes, mode);
1488 gfs2_trans_end(sdp);
1489
1490 if (error)
1491 goto out_trans_fail;
1492
1493 len -= max_bytes;
1494 offset += max_bytes;
1495 gfs2_inplace_release(ip);
1496 gfs2_quota_unlock(ip);
1497 gfs2_alloc_put(ip);
1498 }
1499 goto out_unlock;
1500
1501 out_trans_fail:
1502 gfs2_inplace_release(ip);
1503 out_qunlock:
1504 gfs2_quota_unlock(ip);
1505 out_alloc_put:
1506 gfs2_alloc_put(ip);
1507 out_unlock:
1508 gfs2_glock_dq(&ip->i_gh);
1509 out_uninit:
1510 gfs2_holder_uninit(&ip->i_gh);
1511 return error;
1512 }
1513
1514
1515 static int gfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1516 u64 start, u64 len)
1517 {
1518 struct gfs2_inode *ip = GFS2_I(inode);
1519 struct gfs2_holder gh;
1520 int ret;
1521
1522 ret = fiemap_check_flags(fieinfo, FIEMAP_FLAG_SYNC);
1523 if (ret)
1524 return ret;
1525
1526 mutex_lock(&inode->i_mutex);
1527
1528 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
1529 if (ret)
1530 goto out;
1531
1532 if (gfs2_is_stuffed(ip)) {
1533 u64 phys = ip->i_no_addr << inode->i_blkbits;
1534 u64 size = i_size_read(inode);
1535 u32 flags = FIEMAP_EXTENT_LAST|FIEMAP_EXTENT_NOT_ALIGNED|
1536 FIEMAP_EXTENT_DATA_INLINE;
1537 phys += sizeof(struct gfs2_dinode);
1538 phys += start;
1539 if (start + len > size)
1540 len = size - start;
1541 if (start < size)
1542 ret = fiemap_fill_next_extent(fieinfo, start, phys,
1543 len, flags);
1544 if (ret == 1)
1545 ret = 0;
1546 } else {
1547 ret = __generic_block_fiemap(inode, fieinfo, start, len,
1548 gfs2_block_map);
1549 }
1550
1551 gfs2_glock_dq_uninit(&gh);
1552 out:
1553 mutex_unlock(&inode->i_mutex);
1554 return ret;
1555 }
1556
1557 const struct inode_operations gfs2_file_iops = {
1558 .permission = gfs2_permission,
1559 .setattr = gfs2_setattr,
1560 .getattr = gfs2_getattr,
1561 .setxattr = gfs2_setxattr,
1562 .getxattr = gfs2_getxattr,
1563 .listxattr = gfs2_listxattr,
1564 .removexattr = gfs2_removexattr,
1565 .fallocate = gfs2_fallocate,
1566 .fiemap = gfs2_fiemap,
1567 };
1568
1569 const struct inode_operations gfs2_dir_iops = {
1570 .create = gfs2_create,
1571 .lookup = gfs2_lookup,
1572 .link = gfs2_link,
1573 .unlink = gfs2_unlink,
1574 .symlink = gfs2_symlink,
1575 .mkdir = gfs2_mkdir,
1576 .rmdir = gfs2_rmdir,
1577 .mknod = gfs2_mknod,
1578 .rename = gfs2_rename,
1579 .permission = gfs2_permission,
1580 .setattr = gfs2_setattr,
1581 .getattr = gfs2_getattr,
1582 .setxattr = gfs2_setxattr,
1583 .getxattr = gfs2_getxattr,
1584 .listxattr = gfs2_listxattr,
1585 .removexattr = gfs2_removexattr,
1586 .fiemap = gfs2_fiemap,
1587 };
1588
1589 const struct inode_operations gfs2_symlink_iops = {
1590 .readlink = generic_readlink,
1591 .follow_link = gfs2_follow_link,
1592 .put_link = gfs2_put_link,
1593 .permission = gfs2_permission,
1594 .setattr = gfs2_setattr,
1595 .getattr = gfs2_getattr,
1596 .setxattr = gfs2_setxattr,
1597 .getxattr = gfs2_getxattr,
1598 .listxattr = gfs2_listxattr,
1599 .removexattr = gfs2_removexattr,
1600 .fiemap = gfs2_fiemap,
1601 };
1602
kernel source for telekom puls (alcatel/mediatek)