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Merge branch 'master'
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / gfs2 / inode.c
1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2005 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 v.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/posix_acl.h>
16 #include <linux/sort.h>
17 #include <linux/gfs2_ondisk.h>
18 #include <asm/semaphore.h>
19
20 #include "gfs2.h"
21 #include "lm_interface.h"
22 #include "incore.h"
23 #include "acl.h"
24 #include "bmap.h"
25 #include "dir.h"
26 #include "eattr.h"
27 #include "glock.h"
28 #include "glops.h"
29 #include "inode.h"
30 #include "log.h"
31 #include "meta_io.h"
32 #include "ops_address.h"
33 #include "ops_file.h"
34 #include "ops_inode.h"
35 #include "quota.h"
36 #include "rgrp.h"
37 #include "trans.h"
38 #include "unlinked.h"
39 #include "util.h"
40
41 /**
42 * inode_attr_in - Copy attributes from the dinode into the VFS inode
43 * @ip: The GFS2 inode (with embedded disk inode data)
44 * @inode: The Linux VFS inode
45 *
46 */
47
48 static void inode_attr_in(struct gfs2_inode *ip, struct inode *inode)
49 {
50 inode->i_ino = ip->i_num.no_formal_ino;
51
52 switch (ip->i_di.di_mode & S_IFMT) {
53 case S_IFBLK:
54 case S_IFCHR:
55 inode->i_rdev = MKDEV(ip->i_di.di_major, ip->i_di.di_minor);
56 break;
57 default:
58 inode->i_rdev = 0;
59 break;
60 };
61
62 inode->i_mode = ip->i_di.di_mode;
63 inode->i_nlink = ip->i_di.di_nlink;
64 inode->i_uid = ip->i_di.di_uid;
65 inode->i_gid = ip->i_di.di_gid;
66 i_size_write(inode, ip->i_di.di_size);
67 inode->i_atime.tv_sec = ip->i_di.di_atime;
68 inode->i_mtime.tv_sec = ip->i_di.di_mtime;
69 inode->i_ctime.tv_sec = ip->i_di.di_ctime;
70 inode->i_atime.tv_nsec = 0;
71 inode->i_mtime.tv_nsec = 0;
72 inode->i_ctime.tv_nsec = 0;
73 inode->i_blksize = PAGE_SIZE;
74 inode->i_blocks = ip->i_di.di_blocks <<
75 (ip->i_sbd->sd_sb.sb_bsize_shift - GFS2_BASIC_BLOCK_SHIFT);
76
77 if (ip->i_di.di_flags & GFS2_DIF_IMMUTABLE)
78 inode->i_flags |= S_IMMUTABLE;
79 else
80 inode->i_flags &= ~S_IMMUTABLE;
81
82 if (ip->i_di.di_flags & GFS2_DIF_APPENDONLY)
83 inode->i_flags |= S_APPEND;
84 else
85 inode->i_flags &= ~S_APPEND;
86 }
87
88 /**
89 * gfs2_inode_attr_in - Copy attributes from the dinode into the VFS inode
90 * @ip: The GFS2 inode (with embedded disk inode data)
91 *
92 */
93
94 void gfs2_inode_attr_in(struct gfs2_inode *ip)
95 {
96 struct inode *inode;
97
98 inode = gfs2_ip2v_lookup(ip);
99 if (inode) {
100 inode_attr_in(ip, inode);
101 iput(inode);
102 }
103 }
104
105 /**
106 * gfs2_inode_attr_out - Copy attributes from VFS inode into the dinode
107 * @ip: The GFS2 inode
108 *
109 * Only copy out the attributes that we want the VFS layer
110 * to be able to modify.
111 */
112
113 void gfs2_inode_attr_out(struct gfs2_inode *ip)
114 {
115 struct inode *inode = ip->i_vnode;
116
117 gfs2_assert_withdraw(ip->i_sbd,
118 (ip->i_di.di_mode & S_IFMT) == (inode->i_mode & S_IFMT));
119 ip->i_di.di_mode = inode->i_mode;
120 ip->i_di.di_uid = inode->i_uid;
121 ip->i_di.di_gid = inode->i_gid;
122 ip->i_di.di_atime = inode->i_atime.tv_sec;
123 ip->i_di.di_mtime = inode->i_mtime.tv_sec;
124 ip->i_di.di_ctime = inode->i_ctime.tv_sec;
125 }
126
127 /**
128 * gfs2_ip2v_lookup - Get the struct inode for a struct gfs2_inode
129 * @ip: the struct gfs2_inode to get the struct inode for
130 *
131 * Returns: A VFS inode, or NULL if none
132 */
133
134 struct inode *gfs2_ip2v_lookup(struct gfs2_inode *ip)
135 {
136 struct inode *inode = NULL;
137
138 gfs2_assert_warn(ip->i_sbd, test_bit(GIF_MIN_INIT, &ip->i_flags));
139
140 spin_lock(&ip->i_spin);
141 if (ip->i_vnode)
142 inode = igrab(ip->i_vnode);
143 spin_unlock(&ip->i_spin);
144
145 return inode;
146 }
147
148 /**
149 * gfs2_ip2v - Get/Create a struct inode for a struct gfs2_inode
150 * @ip: the struct gfs2_inode to get the struct inode for
151 *
152 * Returns: A VFS inode, or NULL if no mem
153 */
154
155 struct inode *gfs2_ip2v(struct gfs2_inode *ip)
156 {
157 struct inode *inode, *tmp;
158
159 inode = gfs2_ip2v_lookup(ip);
160 if (inode)
161 return inode;
162
163 tmp = new_inode(ip->i_sbd->sd_vfs);
164 if (!tmp)
165 return NULL;
166
167 inode_attr_in(ip, tmp);
168
169 if (S_ISREG(ip->i_di.di_mode)) {
170 tmp->i_op = &gfs2_file_iops;
171 tmp->i_fop = &gfs2_file_fops;
172 tmp->i_mapping->a_ops = &gfs2_file_aops;
173 } else if (S_ISDIR(ip->i_di.di_mode)) {
174 tmp->i_op = &gfs2_dir_iops;
175 tmp->i_fop = &gfs2_dir_fops;
176 } else if (S_ISLNK(ip->i_di.di_mode)) {
177 tmp->i_op = &gfs2_symlink_iops;
178 } else {
179 tmp->i_op = &gfs2_dev_iops;
180 init_special_inode(tmp, tmp->i_mode, tmp->i_rdev);
181 }
182
183 tmp->u.generic_ip = NULL;
184
185 for (;;) {
186 spin_lock(&ip->i_spin);
187 if (!ip->i_vnode)
188 break;
189 inode = igrab(ip->i_vnode);
190 spin_unlock(&ip->i_spin);
191
192 if (inode) {
193 iput(tmp);
194 return inode;
195 }
196 yield();
197 }
198
199 inode = tmp;
200
201 gfs2_inode_hold(ip);
202 ip->i_vnode = inode;
203 inode->u.generic_ip = ip;
204
205 spin_unlock(&ip->i_spin);
206
207 insert_inode_hash(inode);
208
209 return inode;
210 }
211
212 static int iget_test(struct inode *inode, void *opaque)
213 {
214 struct gfs2_inode *ip = inode->u.generic_ip;
215 struct gfs2_inum *inum = (struct gfs2_inum *)opaque;
216
217 if (ip && ip->i_num.no_addr == inum->no_addr)
218 return 1;
219
220 return 0;
221 }
222
223 struct inode *gfs2_iget(struct super_block *sb, struct gfs2_inum *inum)
224 {
225 return ilookup5(sb, (unsigned long)inum->no_formal_ino,
226 iget_test, inum);
227 }
228
229 void gfs2_inode_min_init(struct gfs2_inode *ip, unsigned int type)
230 {
231 if (!test_and_set_bit(GIF_MIN_INIT, &ip->i_flags)) {
232 ip->i_di.di_nlink = 1;
233 ip->i_di.di_mode = DT2IF(type);
234 }
235 }
236
237 /**
238 * gfs2_inode_refresh - Refresh the incore copy of the dinode
239 * @ip: The GFS2 inode
240 *
241 * Returns: errno
242 */
243
244 int gfs2_inode_refresh(struct gfs2_inode *ip)
245 {
246 struct buffer_head *dibh;
247 int error;
248
249 error = gfs2_meta_inode_buffer(ip, &dibh);
250 if (error)
251 return error;
252
253 if (gfs2_metatype_check(ip->i_sbd, dibh, GFS2_METATYPE_DI)) {
254 brelse(dibh);
255 return -EIO;
256 }
257
258 gfs2_dinode_in(&ip->i_di, dibh->b_data);
259 set_bit(GIF_MIN_INIT, &ip->i_flags);
260
261 brelse(dibh);
262
263 if (ip->i_num.no_addr != ip->i_di.di_num.no_addr) {
264 if (gfs2_consist_inode(ip))
265 gfs2_dinode_print(&ip->i_di);
266 return -EIO;
267 }
268 if (ip->i_num.no_formal_ino != ip->i_di.di_num.no_formal_ino)
269 return -ESTALE;
270
271 ip->i_vn = ip->i_gl->gl_vn;
272
273 return 0;
274 }
275
276 /**
277 * inode_create - create a struct gfs2_inode
278 * @i_gl: The glock covering the inode
279 * @inum: The inode number
280 * @io_gl: the iopen glock to acquire/hold (using holder in new gfs2_inode)
281 * @io_state: the state the iopen glock should be acquired in
282 * @ipp: pointer to put the returned inode in
283 *
284 * Returns: errno
285 */
286
287 static int inode_create(struct gfs2_glock *i_gl, const struct gfs2_inum *inum,
288 struct gfs2_glock *io_gl, unsigned int io_state,
289 struct gfs2_inode **ipp)
290 {
291 struct gfs2_sbd *sdp = i_gl->gl_sbd;
292 struct gfs2_inode *ip;
293 int error = 0;
294
295 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
296 if (!ip)
297 return -ENOMEM;
298 memset(ip, 0, sizeof(struct gfs2_inode));
299
300 ip->i_num = *inum;
301
302 atomic_set(&ip->i_count, 1);
303
304 ip->i_vn = i_gl->gl_vn - 1;
305
306 ip->i_gl = i_gl;
307 ip->i_sbd = sdp;
308
309 spin_lock_init(&ip->i_spin);
310 init_rwsem(&ip->i_rw_mutex);
311
312 ip->i_greedy = gfs2_tune_get(sdp, gt_greedy_default);
313
314 error = gfs2_glock_nq_init(io_gl,
315 io_state, GL_LOCAL_EXCL | GL_EXACT,
316 &ip->i_iopen_gh);
317 if (error)
318 goto fail;
319 ip->i_iopen_gh.gh_owner = NULL;
320
321 spin_lock(&io_gl->gl_spin);
322 gfs2_glock_hold(i_gl);
323 io_gl->gl_object = i_gl;
324 spin_unlock(&io_gl->gl_spin);
325
326 gfs2_glock_hold(i_gl);
327 i_gl->gl_object = ip;
328
329 atomic_inc(&sdp->sd_inode_count);
330
331 *ipp = ip;
332
333 return 0;
334
335 fail:
336 gfs2_meta_cache_flush(ip);
337 kmem_cache_free(gfs2_inode_cachep, ip);
338 *ipp = NULL;
339
340 return error;
341 }
342
343 /**
344 * gfs2_inode_get - Create or get a reference on an inode
345 * @i_gl: The glock covering the inode
346 * @inum: The inode number
347 * @create:
348 * @ipp: pointer to put the returned inode in
349 *
350 * Returns: errno
351 */
352
353 int gfs2_inode_get(struct gfs2_glock *i_gl, const struct gfs2_inum *inum,
354 int create, struct gfs2_inode **ipp)
355 {
356 struct gfs2_sbd *sdp = i_gl->gl_sbd;
357 struct gfs2_glock *io_gl;
358 int error = 0;
359
360 gfs2_glmutex_lock(i_gl);
361
362 *ipp = i_gl->gl_object;
363 if (*ipp) {
364 error = -ESTALE;
365 if ((*ipp)->i_num.no_formal_ino != inum->no_formal_ino)
366 goto out;
367 atomic_inc(&(*ipp)->i_count);
368 error = 0;
369 goto out;
370 }
371
372 if (!create)
373 goto out;
374
375 error = gfs2_glock_get(sdp, inum->no_addr, &gfs2_iopen_glops,
376 CREATE, &io_gl);
377 if (!error) {
378 error = inode_create(i_gl, inum, io_gl, LM_ST_SHARED, ipp);
379 gfs2_glock_put(io_gl);
380 }
381
382 out:
383 gfs2_glmutex_unlock(i_gl);
384
385 return error;
386 }
387
388 void gfs2_inode_hold(struct gfs2_inode *ip)
389 {
390 gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
391 atomic_inc(&ip->i_count);
392 }
393
394 void gfs2_inode_put(struct gfs2_inode *ip)
395 {
396 gfs2_assert(ip->i_sbd, atomic_read(&ip->i_count) > 0);
397 atomic_dec(&ip->i_count);
398 }
399
400 void gfs2_inode_destroy(struct gfs2_inode *ip)
401 {
402 struct gfs2_sbd *sdp = ip->i_sbd;
403 struct gfs2_glock *io_gl = ip->i_iopen_gh.gh_gl;
404 struct gfs2_glock *i_gl = ip->i_gl;
405
406 gfs2_assert_warn(sdp, !atomic_read(&ip->i_count));
407 gfs2_assert(sdp, io_gl->gl_object == i_gl);
408
409 spin_lock(&io_gl->gl_spin);
410 io_gl->gl_object = NULL;
411 gfs2_glock_put(i_gl);
412 spin_unlock(&io_gl->gl_spin);
413
414 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
415
416 gfs2_meta_cache_flush(ip);
417 kmem_cache_free(gfs2_inode_cachep, ip);
418
419 i_gl->gl_object = NULL;
420 gfs2_glock_put(i_gl);
421
422 atomic_dec(&sdp->sd_inode_count);
423 }
424
425 static int dinode_dealloc(struct gfs2_inode *ip, struct gfs2_unlinked *ul)
426 {
427 struct gfs2_sbd *sdp = ip->i_sbd;
428 struct gfs2_alloc *al;
429 struct gfs2_rgrpd *rgd;
430 int error;
431
432 if (ip->i_di.di_blocks != 1) {
433 if (gfs2_consist_inode(ip))
434 gfs2_dinode_print(&ip->i_di);
435 return -EIO;
436 }
437
438 al = gfs2_alloc_get(ip);
439
440 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
441 if (error)
442 goto out;
443
444 error = gfs2_rindex_hold(sdp, &al->al_ri_gh);
445 if (error)
446 goto out_qs;
447
448 rgd = gfs2_blk2rgrpd(sdp, ip->i_num.no_addr);
449 if (!rgd) {
450 gfs2_consist_inode(ip);
451 error = -EIO;
452 goto out_rindex_relse;
453 }
454
455 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
456 &al->al_rgd_gh);
457 if (error)
458 goto out_rindex_relse;
459
460 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
461 RES_STATFS + RES_QUOTA, 1);
462 if (error)
463 goto out_rg_gunlock;
464
465 gfs2_trans_add_gl(ip->i_gl);
466
467 gfs2_free_di(rgd, ip);
468
469 error = gfs2_unlinked_ondisk_rm(sdp, ul);
470
471 gfs2_trans_end(sdp);
472 clear_bit(GLF_STICKY, &ip->i_gl->gl_flags);
473
474 out_rg_gunlock:
475 gfs2_glock_dq_uninit(&al->al_rgd_gh);
476
477 out_rindex_relse:
478 gfs2_glock_dq_uninit(&al->al_ri_gh);
479
480 out_qs:
481 gfs2_quota_unhold(ip);
482
483 out:
484 gfs2_alloc_put(ip);
485
486 return error;
487 }
488
489 /**
490 * inode_dealloc - Deallocate all on-disk blocks for an inode (dinode)
491 * @sdp: the filesystem
492 * @inum: the inode number to deallocate
493 * @io_gh: a holder for the iopen glock for this inode
494 *
495 * Returns: errno
496 */
497
498 static int inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul,
499 struct gfs2_holder *io_gh)
500 {
501 struct gfs2_inode *ip;
502 struct gfs2_holder i_gh;
503 int error;
504
505 error = gfs2_glock_nq_num(sdp,
506 ul->ul_ut.ut_inum.no_addr, &gfs2_inode_glops,
507 LM_ST_EXCLUSIVE, 0, &i_gh);
508 if (error)
509 return error;
510
511 /* We reacquire the iopen lock here to avoid a race with the NFS server
512 calling gfs2_read_inode() with the inode number of a inode we're in
513 the process of deallocating. And we can't keep our hold on the lock
514 from inode_dealloc_init() for deadlock reasons. */
515
516 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY, io_gh);
517 error = gfs2_glock_nq(io_gh);
518 switch (error) {
519 case 0:
520 break;
521 case GLR_TRYFAILED:
522 error = 1;
523 default:
524 goto out;
525 }
526
527 gfs2_assert_warn(sdp, !i_gh.gh_gl->gl_object);
528 error = inode_create(i_gh.gh_gl, &ul->ul_ut.ut_inum, io_gh->gh_gl,
529 LM_ST_EXCLUSIVE, &ip);
530
531 gfs2_glock_dq(io_gh);
532
533 if (error)
534 goto out;
535
536 error = gfs2_inode_refresh(ip);
537 if (error)
538 goto out_iput;
539
540 if (ip->i_di.di_nlink) {
541 if (gfs2_consist_inode(ip))
542 gfs2_dinode_print(&ip->i_di);
543 error = -EIO;
544 goto out_iput;
545 }
546
547 if (S_ISDIR(ip->i_di.di_mode) &&
548 (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
549 error = gfs2_dir_exhash_dealloc(ip);
550 if (error)
551 goto out_iput;
552 }
553
554 if (ip->i_di.di_eattr) {
555 error = gfs2_ea_dealloc(ip);
556 if (error)
557 goto out_iput;
558 }
559
560 if (!gfs2_is_stuffed(ip)) {
561 error = gfs2_file_dealloc(ip);
562 if (error)
563 goto out_iput;
564 }
565
566 error = dinode_dealloc(ip, ul);
567 if (error)
568 goto out_iput;
569
570 out_iput:
571 gfs2_glmutex_lock(i_gh.gh_gl);
572 gfs2_inode_put(ip);
573 gfs2_inode_destroy(ip);
574 gfs2_glmutex_unlock(i_gh.gh_gl);
575
576 out:
577 gfs2_glock_dq_uninit(&i_gh);
578
579 return error;
580 }
581
582 /**
583 * try_inode_dealloc - Try to deallocate an inode and all its blocks
584 * @sdp: the filesystem
585 *
586 * Returns: 0 on success, -errno on error, 1 on busy (inode open)
587 */
588
589 static int try_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
590 {
591 struct gfs2_holder io_gh;
592 int error = 0;
593
594 gfs2_try_toss_inode(sdp, &ul->ul_ut.ut_inum);
595
596 error = gfs2_glock_nq_num(sdp,
597 ul->ul_ut.ut_inum.no_addr, &gfs2_iopen_glops,
598 LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB, &io_gh);
599 switch (error) {
600 case 0:
601 break;
602 case GLR_TRYFAILED:
603 return 1;
604 default:
605 return error;
606 }
607
608 gfs2_glock_dq(&io_gh);
609 error = inode_dealloc(sdp, ul, &io_gh);
610 gfs2_holder_uninit(&io_gh);
611
612 return error;
613 }
614
615 static int inode_dealloc_uninit(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
616 {
617 struct gfs2_rgrpd *rgd;
618 struct gfs2_holder ri_gh, rgd_gh;
619 int error;
620
621 error = gfs2_rindex_hold(sdp, &ri_gh);
622 if (error)
623 return error;
624
625 rgd = gfs2_blk2rgrpd(sdp, ul->ul_ut.ut_inum.no_addr);
626 if (!rgd) {
627 gfs2_consist(sdp);
628 error = -EIO;
629 goto out;
630 }
631
632 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rgd_gh);
633 if (error)
634 goto out;
635
636 error = gfs2_trans_begin(sdp,
637 RES_RG_BIT + RES_UNLINKED + RES_STATFS,
638 0);
639 if (error)
640 goto out_gunlock;
641
642 gfs2_free_uninit_di(rgd, ul->ul_ut.ut_inum.no_addr);
643 gfs2_unlinked_ondisk_rm(sdp, ul);
644
645 gfs2_trans_end(sdp);
646
647 out_gunlock:
648 gfs2_glock_dq_uninit(&rgd_gh);
649 out:
650 gfs2_glock_dq_uninit(&ri_gh);
651
652 return error;
653 }
654
655 int gfs2_inode_dealloc(struct gfs2_sbd *sdp, struct gfs2_unlinked *ul)
656 {
657 if (ul->ul_ut.ut_flags & GFS2_UTF_UNINIT)
658 return inode_dealloc_uninit(sdp, ul);
659 else
660 return try_inode_dealloc(sdp, ul);
661 }
662
663 /**
664 * gfs2_change_nlink - Change nlink count on inode
665 * @ip: The GFS2 inode
666 * @diff: The change in the nlink count required
667 *
668 * Returns: errno
669 */
670
671 int gfs2_change_nlink(struct gfs2_inode *ip, int diff)
672 {
673 struct buffer_head *dibh;
674 uint32_t nlink;
675 int error;
676
677 nlink = ip->i_di.di_nlink + diff;
678
679 /* If we are reducing the nlink count, but the new value ends up being
680 bigger than the old one, we must have underflowed. */
681 if (diff < 0 && nlink > ip->i_di.di_nlink) {
682 if (gfs2_consist_inode(ip))
683 gfs2_dinode_print(&ip->i_di);
684 return -EIO;
685 }
686
687 error = gfs2_meta_inode_buffer(ip, &dibh);
688 if (error)
689 return error;
690
691 ip->i_di.di_nlink = nlink;
692 ip->i_di.di_ctime = get_seconds();
693
694 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
695 gfs2_dinode_out(&ip->i_di, dibh->b_data);
696 brelse(dibh);
697
698 return 0;
699 }
700
701 struct inode *gfs2_lookup_simple(struct inode *dip, const char *name)
702 {
703 struct qstr qstr;
704 qstr.name = name;
705 qstr.len = strlen(name);
706 qstr.hash = gfs2_disk_hash(qstr.name, qstr.len);
707 return gfs2_lookupi(dip, &qstr, 1, NULL);
708 }
709
710
711 /**
712 * gfs2_lookupi - Look up a filename in a directory and return its inode
713 * @d_gh: An initialized holder for the directory glock
714 * @name: The name of the inode to look for
715 * @is_root: If 1, ignore the caller's permissions
716 * @i_gh: An uninitialized holder for the new inode glock
717 *
718 * There will always be a vnode (Linux VFS inode) for the d_gh inode unless
719 * @is_root is true.
720 *
721 * Returns: errno
722 */
723
724 struct inode *gfs2_lookupi(struct inode *dir, struct qstr *name, int is_root,
725 struct nameidata *nd)
726
727 {
728 struct super_block *sb = dir->i_sb;
729 struct gfs2_inode *ipp;
730 struct gfs2_inode *dip = dir->u.generic_ip;
731 struct gfs2_sbd *sdp = dip->i_sbd;
732 struct gfs2_holder d_gh;
733 struct gfs2_inum inum;
734 unsigned int type;
735 struct gfs2_glock *gl;
736 int error = 0;
737 struct inode *inode = NULL;
738
739 if (!name->len || name->len > GFS2_FNAMESIZE)
740 return ERR_PTR(-ENAMETOOLONG);
741
742 if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) ||
743 (name->len == 2 && memcmp(name->name, "..", 2) == 0 &&
744 dir == sb->s_root->d_inode)) {
745 gfs2_inode_hold(dip);
746 ipp = dip;
747 goto done;
748 }
749
750 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
751 if (error)
752 return ERR_PTR(error);
753
754 if (!is_root) {
755 error = gfs2_repermission(dip->i_vnode, MAY_EXEC, NULL);
756 if (error)
757 goto out;
758 }
759
760 error = gfs2_dir_search(dir, name, &inum, &type);
761 if (error)
762 goto out;
763
764 error = gfs2_glock_get(sdp, inum.no_addr, &gfs2_inode_glops,
765 CREATE, &gl);
766 if (error)
767 goto out;
768
769 error = gfs2_inode_get(gl, &inum, CREATE, &ipp);
770 if (!error)
771 gfs2_inode_min_init(ipp, type);
772
773 gfs2_glock_put(gl);
774
775 out:
776 gfs2_glock_dq_uninit(&d_gh);
777 done:
778 if (error == -ENOENT)
779 return NULL;
780 if (error == 0) {
781 inode = gfs2_ip2v(ipp);
782 gfs2_inode_put(ipp);
783 if (!inode)
784 return ERR_PTR(-ENOMEM);
785 return inode;
786 }
787 return ERR_PTR(error);
788 }
789
790 static int pick_formal_ino_1(struct gfs2_sbd *sdp, uint64_t *formal_ino)
791 {
792 struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip;
793 struct buffer_head *bh;
794 struct gfs2_inum_range ir;
795 int error;
796
797 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
798 if (error)
799 return error;
800 mutex_lock(&sdp->sd_inum_mutex);
801
802 error = gfs2_meta_inode_buffer(ip, &bh);
803 if (error) {
804 mutex_unlock(&sdp->sd_inum_mutex);
805 gfs2_trans_end(sdp);
806 return error;
807 }
808
809 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
810
811 if (ir.ir_length) {
812 *formal_ino = ir.ir_start++;
813 ir.ir_length--;
814 gfs2_trans_add_bh(ip->i_gl, bh, 1);
815 gfs2_inum_range_out(&ir,
816 bh->b_data + sizeof(struct gfs2_dinode));
817 brelse(bh);
818 mutex_unlock(&sdp->sd_inum_mutex);
819 gfs2_trans_end(sdp);
820 return 0;
821 }
822
823 brelse(bh);
824
825 mutex_unlock(&sdp->sd_inum_mutex);
826 gfs2_trans_end(sdp);
827
828 return 1;
829 }
830
831 static int pick_formal_ino_2(struct gfs2_sbd *sdp, uint64_t *formal_ino)
832 {
833 struct gfs2_inode *ip = sdp->sd_ir_inode->u.generic_ip;
834 struct gfs2_inode *m_ip = sdp->sd_inum_inode->u.generic_ip;
835 struct gfs2_holder gh;
836 struct buffer_head *bh;
837 struct gfs2_inum_range ir;
838 int error;
839
840 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
841 if (error)
842 return error;
843
844 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
845 if (error)
846 goto out;
847 mutex_lock(&sdp->sd_inum_mutex);
848
849 error = gfs2_meta_inode_buffer(ip, &bh);
850 if (error)
851 goto out_end_trans;
852
853 gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode));
854
855 if (!ir.ir_length) {
856 struct buffer_head *m_bh;
857 uint64_t x, y;
858
859 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
860 if (error)
861 goto out_brelse;
862
863 x = *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode));
864 x = y = be64_to_cpu(x);
865 ir.ir_start = x;
866 ir.ir_length = GFS2_INUM_QUANTUM;
867 x += GFS2_INUM_QUANTUM;
868 if (x < y)
869 gfs2_consist_inode(m_ip);
870 x = cpu_to_be64(x);
871 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
872 *(uint64_t *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = x;
873
874 brelse(m_bh);
875 }
876
877 *formal_ino = ir.ir_start++;
878 ir.ir_length--;
879
880 gfs2_trans_add_bh(ip->i_gl, bh, 1);
881 gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode));
882
883 out_brelse:
884 brelse(bh);
885
886 out_end_trans:
887 mutex_unlock(&sdp->sd_inum_mutex);
888 gfs2_trans_end(sdp);
889
890 out:
891 gfs2_glock_dq_uninit(&gh);
892
893 return error;
894 }
895
896 static int pick_formal_ino(struct gfs2_sbd *sdp, uint64_t *inum)
897 {
898 int error;
899
900 error = pick_formal_ino_1(sdp, inum);
901 if (error <= 0)
902 return error;
903
904 error = pick_formal_ino_2(sdp, inum);
905
906 return error;
907 }
908
909 /**
910 * create_ok - OK to create a new on-disk inode here?
911 * @dip: Directory in which dinode is to be created
912 * @name: Name of new dinode
913 * @mode:
914 *
915 * Returns: errno
916 */
917
918 static int create_ok(struct gfs2_inode *dip, struct qstr *name,
919 unsigned int mode)
920 {
921 int error;
922
923 error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
924 if (error)
925 return error;
926
927 /* Don't create entries in an unlinked directory */
928 if (!dip->i_di.di_nlink)
929 return -EPERM;
930
931 error = gfs2_dir_search(dip->i_vnode, name, NULL, NULL);
932 switch (error) {
933 case -ENOENT:
934 error = 0;
935 break;
936 case 0:
937 return -EEXIST;
938 default:
939 return error;
940 }
941
942 if (dip->i_di.di_entries == (uint32_t)-1)
943 return -EFBIG;
944 if (S_ISDIR(mode) && dip->i_di.di_nlink == (uint32_t)-1)
945 return -EMLINK;
946
947 return 0;
948 }
949
950 static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode,
951 unsigned int *uid, unsigned int *gid)
952 {
953 if (dip->i_sbd->sd_args.ar_suiddir &&
954 (dip->i_di.di_mode & S_ISUID) &&
955 dip->i_di.di_uid) {
956 if (S_ISDIR(*mode))
957 *mode |= S_ISUID;
958 else if (dip->i_di.di_uid != current->fsuid)
959 *mode &= ~07111;
960 *uid = dip->i_di.di_uid;
961 } else
962 *uid = current->fsuid;
963
964 if (dip->i_di.di_mode & S_ISGID) {
965 if (S_ISDIR(*mode))
966 *mode |= S_ISGID;
967 *gid = dip->i_di.di_gid;
968 } else
969 *gid = current->fsgid;
970 }
971
972 static int alloc_dinode(struct gfs2_inode *dip, struct gfs2_unlinked *ul)
973 {
974 struct gfs2_sbd *sdp = dip->i_sbd;
975 int error;
976
977 gfs2_alloc_get(dip);
978
979 dip->i_alloc.al_requested = RES_DINODE;
980 error = gfs2_inplace_reserve(dip);
981 if (error)
982 goto out;
983
984 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_UNLINKED +
985 RES_STATFS, 0);
986 if (error)
987 goto out_ipreserv;
988
989 ul->ul_ut.ut_inum.no_addr = gfs2_alloc_di(dip);
990
991 ul->ul_ut.ut_flags = GFS2_UTF_UNINIT;
992 error = gfs2_unlinked_ondisk_add(sdp, ul);
993
994 gfs2_trans_end(sdp);
995
996 out_ipreserv:
997 gfs2_inplace_release(dip);
998
999 out:
1000 gfs2_alloc_put(dip);
1001
1002 return error;
1003 }
1004
1005 /**
1006 * init_dinode - Fill in a new dinode structure
1007 * @dip: the directory this inode is being created in
1008 * @gl: The glock covering the new inode
1009 * @inum: the inode number
1010 * @mode: the file permissions
1011 * @uid:
1012 * @gid:
1013 *
1014 */
1015
1016 static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
1017 struct gfs2_inum *inum, unsigned int mode,
1018 unsigned int uid, unsigned int gid)
1019 {
1020 struct gfs2_sbd *sdp = dip->i_sbd;
1021 struct gfs2_dinode *di;
1022 struct buffer_head *dibh;
1023
1024 dibh = gfs2_meta_new(gl, inum->no_addr);
1025 gfs2_trans_add_bh(gl, dibh, 1);
1026 gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI);
1027 gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode));
1028 di = (struct gfs2_dinode *)dibh->b_data;
1029
1030 di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino);
1031 di->di_num.no_addr = cpu_to_be64(inum->no_addr);
1032 di->di_mode = cpu_to_be32(mode);
1033 di->di_uid = cpu_to_be32(uid);
1034 di->di_gid = cpu_to_be32(gid);
1035 di->di_nlink = cpu_to_be32(0);
1036 di->di_size = cpu_to_be64(0);
1037 di->di_blocks = cpu_to_be64(1);
1038 di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(get_seconds());
1039 di->di_major = di->di_minor = cpu_to_be32(0);
1040 di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr);
1041 di->__pad[0] = di->__pad[1] = 0;
1042 di->di_flags = cpu_to_be32(0);
1043
1044 if (S_ISREG(mode)) {
1045 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_JDATA) ||
1046 gfs2_tune_get(sdp, gt_new_files_jdata))
1047 di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA);
1048 if ((dip->i_di.di_flags & GFS2_DIF_INHERIT_DIRECTIO) ||
1049 gfs2_tune_get(sdp, gt_new_files_directio))
1050 di->di_flags |= cpu_to_be32(GFS2_DIF_DIRECTIO);
1051 } else if (S_ISDIR(mode)) {
1052 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
1053 GFS2_DIF_INHERIT_DIRECTIO);
1054 di->di_flags |= cpu_to_be32(dip->i_di.di_flags &
1055 GFS2_DIF_INHERIT_JDATA);
1056 }
1057
1058 di->__pad1 = 0;
1059 di->di_height = cpu_to_be32(0);
1060 di->__pad2 = 0;
1061 di->__pad3 = 0;
1062 di->di_depth = cpu_to_be16(0);
1063 di->di_entries = cpu_to_be32(0);
1064 memset(&di->__pad4, 0, sizeof(di->__pad4));
1065 di->di_eattr = cpu_to_be64(0);
1066 memset(&di->di_reserved, 0, sizeof(di->di_reserved));
1067
1068 brelse(dibh);
1069 }
1070
1071 static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl,
1072 unsigned int mode, struct gfs2_unlinked *ul)
1073 {
1074 struct gfs2_sbd *sdp = dip->i_sbd;
1075 unsigned int uid, gid;
1076 int error;
1077
1078 munge_mode_uid_gid(dip, &mode, &uid, &gid);
1079
1080 gfs2_alloc_get(dip);
1081
1082 error = gfs2_quota_lock(dip, uid, gid);
1083 if (error)
1084 goto out;
1085
1086 error = gfs2_quota_check(dip, uid, gid);
1087 if (error)
1088 goto out_quota;
1089
1090 error = gfs2_trans_begin(sdp, RES_DINODE + RES_UNLINKED +
1091 RES_QUOTA, 0);
1092 if (error)
1093 goto out_quota;
1094
1095 ul->ul_ut.ut_flags = 0;
1096 error = gfs2_unlinked_ondisk_munge(sdp, ul);
1097
1098 init_dinode(dip, gl, &ul->ul_ut.ut_inum,
1099 mode, uid, gid);
1100
1101 gfs2_quota_change(dip, +1, uid, gid);
1102
1103 gfs2_trans_end(sdp);
1104
1105 out_quota:
1106 gfs2_quota_unlock(dip);
1107
1108 out:
1109 gfs2_alloc_put(dip);
1110
1111 return error;
1112 }
1113
1114 static int link_dinode(struct gfs2_inode *dip, struct qstr *name,
1115 struct gfs2_inode *ip, struct gfs2_unlinked *ul)
1116 {
1117 struct gfs2_sbd *sdp = dip->i_sbd;
1118 struct gfs2_alloc *al;
1119 int alloc_required;
1120 struct buffer_head *dibh;
1121 int error;
1122
1123 al = gfs2_alloc_get(dip);
1124
1125 error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1126 if (error)
1127 goto fail;
1128
1129 error = alloc_required = gfs2_diradd_alloc_required(dip->i_vnode, name);
1130 if (alloc_required < 0)
1131 goto fail;
1132 if (alloc_required) {
1133 error = gfs2_quota_check(dip, dip->i_di.di_uid,
1134 dip->i_di.di_gid);
1135 if (error)
1136 goto fail_quota_locks;
1137
1138 al->al_requested = sdp->sd_max_dirres;
1139
1140 error = gfs2_inplace_reserve(dip);
1141 if (error)
1142 goto fail_quota_locks;
1143
1144 error = gfs2_trans_begin(sdp,
1145 sdp->sd_max_dirres +
1146 al->al_rgd->rd_ri.ri_length +
1147 2 * RES_DINODE + RES_UNLINKED +
1148 RES_STATFS + RES_QUOTA, 0);
1149 if (error)
1150 goto fail_ipreserv;
1151 } else {
1152 error = gfs2_trans_begin(sdp,
1153 RES_LEAF +
1154 2 * RES_DINODE +
1155 RES_UNLINKED, 0);
1156 if (error)
1157 goto fail_quota_locks;
1158 }
1159
1160 error = gfs2_dir_add(dip->i_vnode, name, &ip->i_num, IF2DT(ip->i_di.di_mode));
1161 if (error)
1162 goto fail_end_trans;
1163
1164 error = gfs2_meta_inode_buffer(ip, &dibh);
1165 if (error)
1166 goto fail_end_trans;
1167 ip->i_di.di_nlink = 1;
1168 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1169 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1170 brelse(dibh);
1171
1172 error = gfs2_unlinked_ondisk_rm(sdp, ul);
1173 if (error)
1174 goto fail_end_trans;
1175
1176 return 0;
1177
1178 fail_end_trans:
1179 gfs2_trans_end(sdp);
1180
1181 fail_ipreserv:
1182 if (dip->i_alloc.al_rgd)
1183 gfs2_inplace_release(dip);
1184
1185 fail_quota_locks:
1186 gfs2_quota_unlock(dip);
1187
1188 fail:
1189 gfs2_alloc_put(dip);
1190
1191 return error;
1192 }
1193
1194 /**
1195 * gfs2_createi - Create a new inode
1196 * @ghs: An array of two holders
1197 * @name: The name of the new file
1198 * @mode: the permissions on the new inode
1199 *
1200 * @ghs[0] is an initialized holder for the directory
1201 * @ghs[1] is the holder for the inode lock
1202 *
1203 * If the return value is not NULL, the glocks on both the directory and the new
1204 * file are held. A transaction has been started and an inplace reservation
1205 * is held, as well.
1206 *
1207 * Returns: An inode
1208 */
1209
1210 struct inode *gfs2_createi(struct gfs2_holder *ghs, struct qstr *name,
1211 unsigned int mode)
1212 {
1213 struct inode *inode;
1214 struct gfs2_inode *dip = ghs->gh_gl->gl_object;
1215 struct gfs2_sbd *sdp = dip->i_sbd;
1216 struct gfs2_unlinked *ul;
1217 struct gfs2_inode *ip;
1218 int error;
1219
1220 if (!name->len || name->len > GFS2_FNAMESIZE)
1221 return ERR_PTR(-ENAMETOOLONG);
1222
1223 error = gfs2_unlinked_get(sdp, &ul);
1224 if (error)
1225 return ERR_PTR(error);
1226
1227 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
1228 error = gfs2_glock_nq(ghs);
1229 if (error)
1230 goto fail;
1231
1232 error = create_ok(dip, name, mode);
1233 if (error)
1234 goto fail_gunlock;
1235
1236 error = pick_formal_ino(sdp, &ul->ul_ut.ut_inum.no_formal_ino);
1237 if (error)
1238 goto fail_gunlock;
1239
1240 error = alloc_dinode(dip, ul);
1241 if (error)
1242 goto fail_gunlock;
1243
1244 if (ul->ul_ut.ut_inum.no_addr < dip->i_num.no_addr) {
1245 gfs2_glock_dq(ghs);
1246
1247 error = gfs2_glock_nq_num(sdp,
1248 ul->ul_ut.ut_inum.no_addr,
1249 &gfs2_inode_glops,
1250 LM_ST_EXCLUSIVE, GL_SKIP,
1251 ghs + 1);
1252 if (error) {
1253 gfs2_unlinked_put(sdp, ul);
1254 return ERR_PTR(error);
1255 }
1256
1257 gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs);
1258 error = gfs2_glock_nq(ghs);
1259 if (error) {
1260 gfs2_glock_dq_uninit(ghs + 1);
1261 gfs2_unlinked_put(sdp, ul);
1262 return ERR_PTR(error);
1263 }
1264
1265 error = create_ok(dip, name, mode);
1266 if (error)
1267 goto fail_gunlock2;
1268 } else {
1269 error = gfs2_glock_nq_num(sdp,
1270 ul->ul_ut.ut_inum.no_addr,
1271 &gfs2_inode_glops,
1272 LM_ST_EXCLUSIVE, GL_SKIP,
1273 ghs + 1);
1274 if (error)
1275 goto fail_gunlock;
1276 }
1277
1278 error = make_dinode(dip, ghs[1].gh_gl, mode, ul);
1279 if (error)
1280 goto fail_gunlock2;
1281
1282 error = gfs2_inode_get(ghs[1].gh_gl, &ul->ul_ut.ut_inum, CREATE, &ip);
1283 if (error)
1284 goto fail_gunlock2;
1285
1286 error = gfs2_inode_refresh(ip);
1287 if (error)
1288 goto fail_iput;
1289
1290 error = gfs2_acl_create(dip, ip);
1291 if (error)
1292 goto fail_iput;
1293
1294 error = link_dinode(dip, name, ip, ul);
1295 if (error)
1296 goto fail_iput;
1297
1298 gfs2_unlinked_put(sdp, ul);
1299
1300 inode = gfs2_ip2v(ip);
1301 gfs2_inode_put(ip);
1302 if (!inode)
1303 return ERR_PTR(-ENOMEM);
1304 return inode;
1305
1306 fail_iput:
1307 gfs2_inode_put(ip);
1308
1309 fail_gunlock2:
1310 gfs2_glock_dq_uninit(ghs + 1);
1311
1312 fail_gunlock:
1313 gfs2_glock_dq(ghs);
1314
1315 fail:
1316 gfs2_unlinked_put(sdp, ul);
1317
1318 return ERR_PTR(error);
1319 }
1320
1321 /**
1322 * gfs2_unlinki - Unlink a file
1323 * @dip: The inode of the directory
1324 * @name: The name of the file to be unlinked
1325 * @ip: The inode of the file to be removed
1326 *
1327 * Assumes Glocks on both dip and ip are held.
1328 *
1329 * Returns: errno
1330 */
1331
1332 int gfs2_unlinki(struct gfs2_inode *dip, struct qstr *name,
1333 struct gfs2_inode *ip, struct gfs2_unlinked *ul)
1334 {
1335 struct gfs2_sbd *sdp = dip->i_sbd;
1336 int error;
1337
1338 error = gfs2_dir_del(dip, name);
1339 if (error)
1340 return error;
1341
1342 error = gfs2_change_nlink(ip, -1);
1343 if (error)
1344 return error;
1345
1346 /* If this inode is being unlinked from the directory structure,
1347 we need to mark that in the log so that it isn't lost during
1348 a crash. */
1349
1350 if (!ip->i_di.di_nlink) {
1351 ul->ul_ut.ut_inum = ip->i_num;
1352 error = gfs2_unlinked_ondisk_add(sdp, ul);
1353 if (!error)
1354 set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
1355 }
1356
1357 return error;
1358 }
1359
1360 /**
1361 * gfs2_rmdiri - Remove a directory
1362 * @dip: The parent directory of the directory to be removed
1363 * @name: The name of the directory to be removed
1364 * @ip: The GFS2 inode of the directory to be removed
1365 *
1366 * Assumes Glocks on dip and ip are held
1367 *
1368 * Returns: errno
1369 */
1370
1371 int gfs2_rmdiri(struct gfs2_inode *dip, struct qstr *name,
1372 struct gfs2_inode *ip, struct gfs2_unlinked *ul)
1373 {
1374 struct gfs2_sbd *sdp = dip->i_sbd;
1375 struct qstr dotname;
1376 int error;
1377
1378 if (ip->i_di.di_entries != 2) {
1379 if (gfs2_consist_inode(ip))
1380 gfs2_dinode_print(&ip->i_di);
1381 return -EIO;
1382 }
1383
1384 error = gfs2_dir_del(dip, name);
1385 if (error)
1386 return error;
1387
1388 error = gfs2_change_nlink(dip, -1);
1389 if (error)
1390 return error;
1391
1392 dotname.len = 1;
1393 dotname.name = ".";
1394 dotname.hash = gfs2_disk_hash(dotname.name, dotname.len);
1395 error = gfs2_dir_del(ip, &dotname);
1396 if (error)
1397 return error;
1398
1399 dotname.len = 2;
1400 dotname.name = "..";
1401 dotname.hash = gfs2_disk_hash(dotname.name, dotname.len);
1402 error = gfs2_dir_del(ip, &dotname);
1403 if (error)
1404 return error;
1405
1406 error = gfs2_change_nlink(ip, -2);
1407 if (error)
1408 return error;
1409
1410 /* This inode is being unlinked from the directory structure and
1411 we need to mark that in the log so that it isn't lost during
1412 a crash. */
1413
1414 ul->ul_ut.ut_inum = ip->i_num;
1415 error = gfs2_unlinked_ondisk_add(sdp, ul);
1416 if (!error)
1417 set_bit(GLF_STICKY, &ip->i_gl->gl_flags);
1418
1419 return error;
1420 }
1421
1422 /*
1423 * gfs2_unlink_ok - check to see that a inode is still in a directory
1424 * @dip: the directory
1425 * @name: the name of the file
1426 * @ip: the inode
1427 *
1428 * Assumes that the lock on (at least) @dip is held.
1429 *
1430 * Returns: 0 if the parent/child relationship is correct, errno if it isn't
1431 */
1432
1433 int gfs2_unlink_ok(struct gfs2_inode *dip, struct qstr *name,
1434 struct gfs2_inode *ip)
1435 {
1436 struct gfs2_inum inum;
1437 unsigned int type;
1438 int error;
1439
1440 if (IS_IMMUTABLE(ip->i_vnode) || IS_APPEND(ip->i_vnode))
1441 return -EPERM;
1442
1443 if ((dip->i_di.di_mode & S_ISVTX) &&
1444 dip->i_di.di_uid != current->fsuid &&
1445 ip->i_di.di_uid != current->fsuid &&
1446 !capable(CAP_FOWNER))
1447 return -EPERM;
1448
1449 if (IS_APPEND(dip->i_vnode))
1450 return -EPERM;
1451
1452 error = gfs2_repermission(dip->i_vnode, MAY_WRITE | MAY_EXEC, NULL);
1453 if (error)
1454 return error;
1455
1456 error = gfs2_dir_search(dip->i_vnode, name, &inum, &type);
1457 if (error)
1458 return error;
1459
1460 if (!gfs2_inum_equal(&inum, &ip->i_num))
1461 return -ENOENT;
1462
1463 if (IF2DT(ip->i_di.di_mode) != type) {
1464 gfs2_consist_inode(dip);
1465 return -EIO;
1466 }
1467
1468 return 0;
1469 }
1470
1471 /*
1472 * gfs2_ok_to_move - check if it's ok to move a directory to another directory
1473 * @this: move this
1474 * @to: to here
1475 *
1476 * Follow @to back to the root and make sure we don't encounter @this
1477 * Assumes we already hold the rename lock.
1478 *
1479 * Returns: errno
1480 */
1481
1482 int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
1483 {
1484 struct inode *dir = to->i_vnode;
1485 struct super_block *sb = dir->i_sb;
1486 struct inode *tmp;
1487 struct qstr dotdot;
1488 int error = 0;
1489
1490 memset(&dotdot, 0, sizeof(struct qstr));
1491 dotdot.name = "..";
1492 dotdot.len = 2;
1493 dotdot.hash = gfs2_disk_hash(dotdot.name, dotdot.len);
1494
1495 igrab(dir);
1496
1497 for (;;) {
1498 if (dir == this->i_vnode) {
1499 error = -EINVAL;
1500 break;
1501 }
1502 if (dir == sb->s_root->d_inode) {
1503 error = 0;
1504 break;
1505 }
1506
1507 tmp = gfs2_lookupi(dir, &dotdot, 1, NULL);
1508 if (IS_ERR(tmp)) {
1509 error = PTR_ERR(tmp);
1510 break;
1511 }
1512
1513 iput(dir);
1514 dir = tmp;
1515 }
1516
1517 iput(dir);
1518
1519 return error;
1520 }
1521
1522 /**
1523 * gfs2_readlinki - return the contents of a symlink
1524 * @ip: the symlink's inode
1525 * @buf: a pointer to the buffer to be filled
1526 * @len: a pointer to the length of @buf
1527 *
1528 * If @buf is too small, a piece of memory is kmalloc()ed and needs
1529 * to be freed by the caller.
1530 *
1531 * Returns: errno
1532 */
1533
1534 int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len)
1535 {
1536 struct gfs2_holder i_gh;
1537 struct buffer_head *dibh;
1538 unsigned int x;
1539 int error;
1540
1541 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, GL_ATIME, &i_gh);
1542 error = gfs2_glock_nq_atime(&i_gh);
1543 if (error) {
1544 gfs2_holder_uninit(&i_gh);
1545 return error;
1546 }
1547
1548 if (!ip->i_di.di_size) {
1549 gfs2_consist_inode(ip);
1550 error = -EIO;
1551 goto out;
1552 }
1553
1554 error = gfs2_meta_inode_buffer(ip, &dibh);
1555 if (error)
1556 goto out;
1557
1558 x = ip->i_di.di_size + 1;
1559 if (x > *len) {
1560 *buf = kmalloc(x, GFP_KERNEL);
1561 if (!*buf) {
1562 error = -ENOMEM;
1563 goto out_brelse;
1564 }
1565 }
1566
1567 memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x);
1568 *len = x;
1569
1570 out_brelse:
1571 brelse(dibh);
1572
1573 out:
1574 gfs2_glock_dq_uninit(&i_gh);
1575
1576 return error;
1577 }
1578
1579 /**
1580 * gfs2_glock_nq_atime - Acquire a hold on an inode's glock, and
1581 * conditionally update the inode's atime
1582 * @gh: the holder to acquire
1583 *
1584 * Tests atime (access time) for gfs2_read, gfs2_readdir and gfs2_mmap
1585 * Update if the difference between the current time and the inode's current
1586 * atime is greater than an interval specified at mount.
1587 *
1588 * Returns: errno
1589 */
1590
1591 int gfs2_glock_nq_atime(struct gfs2_holder *gh)
1592 {
1593 struct gfs2_glock *gl = gh->gh_gl;
1594 struct gfs2_sbd *sdp = gl->gl_sbd;
1595 struct gfs2_inode *ip = gl->gl_object;
1596 int64_t curtime, quantum = gfs2_tune_get(sdp, gt_atime_quantum);
1597 unsigned int state;
1598 int flags;
1599 int error;
1600
1601 if (gfs2_assert_warn(sdp, gh->gh_flags & GL_ATIME) ||
1602 gfs2_assert_warn(sdp, !(gh->gh_flags & GL_ASYNC)) ||
1603 gfs2_assert_warn(sdp, gl->gl_ops == &gfs2_inode_glops))
1604 return -EINVAL;
1605
1606 state = gh->gh_state;
1607 flags = gh->gh_flags;
1608
1609 error = gfs2_glock_nq(gh);
1610 if (error)
1611 return error;
1612
1613 if (test_bit(SDF_NOATIME, &sdp->sd_flags) ||
1614 (sdp->sd_vfs->s_flags & MS_RDONLY))
1615 return 0;
1616
1617 curtime = get_seconds();
1618 if (curtime - ip->i_di.di_atime >= quantum) {
1619 gfs2_glock_dq(gh);
1620 gfs2_holder_reinit(LM_ST_EXCLUSIVE,
1621 gh->gh_flags & ~LM_FLAG_ANY,
1622 gh);
1623 error = gfs2_glock_nq(gh);
1624 if (error)
1625 return error;
1626
1627 /* Verify that atime hasn't been updated while we were
1628 trying to get exclusive lock. */
1629
1630 curtime = get_seconds();
1631 if (curtime - ip->i_di.di_atime >= quantum) {
1632 struct buffer_head *dibh;
1633
1634 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
1635 if (error == -EROFS)
1636 return 0;
1637 if (error)
1638 goto fail;
1639
1640 error = gfs2_meta_inode_buffer(ip, &dibh);
1641 if (error)
1642 goto fail_end_trans;
1643
1644 ip->i_di.di_atime = curtime;
1645
1646 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1647 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1648 brelse(dibh);
1649
1650 gfs2_trans_end(sdp);
1651 }
1652
1653 /* If someone else has asked for the glock,
1654 unlock and let them have it. Then reacquire
1655 in the original state. */
1656 if (gfs2_glock_is_blocking(gl)) {
1657 gfs2_glock_dq(gh);
1658 gfs2_holder_reinit(state, flags, gh);
1659 return gfs2_glock_nq(gh);
1660 }
1661 }
1662
1663 return 0;
1664
1665 fail_end_trans:
1666 gfs2_trans_end(sdp);
1667
1668 fail:
1669 gfs2_glock_dq(gh);
1670
1671 return error;
1672 }
1673
1674 /**
1675 * glock_compare_atime - Compare two struct gfs2_glock structures for sort
1676 * @arg_a: the first structure
1677 * @arg_b: the second structure
1678 *
1679 * Returns: 1 if A > B
1680 * -1 if A < B
1681 * 0 if A = B
1682 */
1683
1684 static int glock_compare_atime(const void *arg_a, const void *arg_b)
1685 {
1686 struct gfs2_holder *gh_a = *(struct gfs2_holder **)arg_a;
1687 struct gfs2_holder *gh_b = *(struct gfs2_holder **)arg_b;
1688 struct lm_lockname *a = &gh_a->gh_gl->gl_name;
1689 struct lm_lockname *b = &gh_b->gh_gl->gl_name;
1690 int ret = 0;
1691
1692 if (a->ln_number > b->ln_number)
1693 ret = 1;
1694 else if (a->ln_number < b->ln_number)
1695 ret = -1;
1696 else {
1697 if (gh_a->gh_state == LM_ST_SHARED &&
1698 gh_b->gh_state == LM_ST_EXCLUSIVE)
1699 ret = 1;
1700 else if (gh_a->gh_state == LM_ST_SHARED &&
1701 (gh_b->gh_flags & GL_ATIME))
1702 ret = 1;
1703 }
1704
1705 return ret;
1706 }
1707
1708 /**
1709 * gfs2_glock_nq_m_atime - acquire multiple glocks where one may need an
1710 * atime update
1711 * @num_gh: the number of structures
1712 * @ghs: an array of struct gfs2_holder structures
1713 *
1714 * Returns: 0 on success (all glocks acquired),
1715 * errno on failure (no glocks acquired)
1716 */
1717
1718 int gfs2_glock_nq_m_atime(unsigned int num_gh, struct gfs2_holder *ghs)
1719 {
1720 struct gfs2_holder **p;
1721 unsigned int x;
1722 int error = 0;
1723
1724 if (!num_gh)
1725 return 0;
1726
1727 if (num_gh == 1) {
1728 ghs->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1729 if (ghs->gh_flags & GL_ATIME)
1730 error = gfs2_glock_nq_atime(ghs);
1731 else
1732 error = gfs2_glock_nq(ghs);
1733 return error;
1734 }
1735
1736 p = kcalloc(num_gh, sizeof(struct gfs2_holder *), GFP_KERNEL);
1737 if (!p)
1738 return -ENOMEM;
1739
1740 for (x = 0; x < num_gh; x++)
1741 p[x] = &ghs[x];
1742
1743 sort(p, num_gh, sizeof(struct gfs2_holder *), glock_compare_atime,NULL);
1744
1745 for (x = 0; x < num_gh; x++) {
1746 p[x]->gh_flags &= ~(LM_FLAG_TRY | GL_ASYNC);
1747
1748 if (p[x]->gh_flags & GL_ATIME)
1749 error = gfs2_glock_nq_atime(p[x]);
1750 else
1751 error = gfs2_glock_nq(p[x]);
1752
1753 if (error) {
1754 while (x--)
1755 gfs2_glock_dq(p[x]);
1756 break;
1757 }
1758 }
1759
1760 kfree(p);
1761
1762 return error;
1763 }
1764
1765 /**
1766 * gfs2_try_toss_vnode - See if we can toss a vnode from memory
1767 * @ip: the inode
1768 *
1769 * Returns: 1 if the vnode was tossed
1770 */
1771
1772 void gfs2_try_toss_vnode(struct gfs2_inode *ip)
1773 {
1774 struct inode *inode;
1775
1776 inode = gfs2_ip2v_lookup(ip);
1777 if (!inode)
1778 return;
1779
1780 d_prune_aliases(inode);
1781
1782 if (S_ISDIR(ip->i_di.di_mode)) {
1783 struct list_head *head = &inode->i_dentry;
1784 struct dentry *d = NULL;
1785
1786 spin_lock(&dcache_lock);
1787 if (list_empty(head))
1788 spin_unlock(&dcache_lock);
1789 else {
1790 d = list_entry(head->next, struct dentry, d_alias);
1791 dget_locked(d);
1792 spin_unlock(&dcache_lock);
1793
1794 if (have_submounts(d))
1795 dput(d);
1796 else {
1797 shrink_dcache_parent(d);
1798 dput(d);
1799 d_prune_aliases(inode);
1800 }
1801 }
1802 }
1803
1804 inode->i_nlink = 0;
1805 iput(inode);
1806 }
1807
1808
1809 static int
1810 __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1811 {
1812 struct buffer_head *dibh;
1813 int error;
1814
1815 error = gfs2_meta_inode_buffer(ip, &dibh);
1816 if (!error) {
1817 error = inode_setattr(ip->i_vnode, attr);
1818 gfs2_assert_warn(ip->i_sbd, !error);
1819 gfs2_inode_attr_out(ip);
1820
1821 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1822 gfs2_dinode_out(&ip->i_di, dibh->b_data);
1823 brelse(dibh);
1824 }
1825 return error;
1826 }
1827
1828 /**
1829 * gfs2_setattr_simple -
1830 * @ip:
1831 * @attr:
1832 *
1833 * Called with a reference on the vnode.
1834 *
1835 * Returns: errno
1836 */
1837
1838 int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr)
1839 {
1840 int error;
1841
1842 if (current->journal_info)
1843 return __gfs2_setattr_simple(ip, attr);
1844
1845 error = gfs2_trans_begin(ip->i_sbd, RES_DINODE, 0);
1846 if (error)
1847 return error;
1848
1849 error = __gfs2_setattr_simple(ip, attr);
1850
1851 gfs2_trans_end(ip->i_sbd);
1852
1853 return error;
1854 }
1855
1856 int gfs2_repermission(struct inode *inode, int mask, struct nameidata *nd)
1857 {
1858 return permission(inode, mask, nd);
1859 }
1860
kernel source for telekom puls (alcatel/mediatek)