1
2
3
4
5
6
7
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/xattr.h>
15#include <linux/gfs2_ondisk.h>
16#include <asm/uaccess.h>
17
18#include "gfs2.h"
19#include "incore.h"
20#include "acl.h"
21#include "xattr.h"
22#include "glock.h"
23#include "inode.h"
24#include "meta_io.h"
25#include "quota.h"
26#include "rgrp.h"
27#include "trans.h"
28#include "util.h"
29
30
31
32
33
34
35
36
37
38
39
40static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
41 unsigned int *size)
42{
43 unsigned int jbsize = sdp->sd_jbsize;
44
45
46 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
47
48 if (*size <= jbsize)
49 return 1;
50
51
52 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
53 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
54
55 return 0;
56}
57
58static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
59{
60 unsigned int size;
61
62 if (dsize > GFS2_EA_MAX_DATA_LEN)
63 return -ERANGE;
64
65 ea_calc_size(sdp, nsize, dsize, &size);
66
67
68 if (size > sdp->sd_jbsize)
69 return -ERANGE;
70
71 return 0;
72}
73
74typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
75 struct gfs2_ea_header *ea,
76 struct gfs2_ea_header *prev, void *private);
77
78static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
79 ea_call_t ea_call, void *data)
80{
81 struct gfs2_ea_header *ea, *prev = NULL;
82 int error = 0;
83
84 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
85 return -EIO;
86
87 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
88 if (!GFS2_EA_REC_LEN(ea))
89 goto fail;
90 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
91 bh->b_data + bh->b_size))
92 goto fail;
93 if (!GFS2_EATYPE_VALID(ea->ea_type))
94 goto fail;
95
96 error = ea_call(ip, bh, ea, prev, data);
97 if (error)
98 return error;
99
100 if (GFS2_EA_IS_LAST(ea)) {
101 if ((char *)GFS2_EA2NEXT(ea) !=
102 bh->b_data + bh->b_size)
103 goto fail;
104 break;
105 }
106 }
107
108 return error;
109
110fail:
111 gfs2_consist_inode(ip);
112 return -EIO;
113}
114
115static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
116{
117 struct buffer_head *bh, *eabh;
118 __be64 *eablk, *end;
119 int error;
120
121 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
122 if (error)
123 return error;
124
125 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
126 error = ea_foreach_i(ip, bh, ea_call, data);
127 goto out;
128 }
129
130 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
131 error = -EIO;
132 goto out;
133 }
134
135 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
136 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
137
138 for (; eablk < end; eablk++) {
139 u64 bn;
140
141 if (!*eablk)
142 break;
143 bn = be64_to_cpu(*eablk);
144
145 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
146 if (error)
147 break;
148 error = ea_foreach_i(ip, eabh, ea_call, data);
149 brelse(eabh);
150 if (error)
151 break;
152 }
153out:
154 brelse(bh);
155 return error;
156}
157
158struct ea_find {
159 int type;
160 const char *name;
161 size_t namel;
162 struct gfs2_ea_location *ef_el;
163};
164
165static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
166 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
167 void *private)
168{
169 struct ea_find *ef = private;
170
171 if (ea->ea_type == GFS2_EATYPE_UNUSED)
172 return 0;
173
174 if (ea->ea_type == ef->type) {
175 if (ea->ea_name_len == ef->namel &&
176 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
177 struct gfs2_ea_location *el = ef->ef_el;
178 get_bh(bh);
179 el->el_bh = bh;
180 el->el_ea = ea;
181 el->el_prev = prev;
182 return 1;
183 }
184 }
185
186 return 0;
187}
188
189static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
190 struct gfs2_ea_location *el)
191{
192 struct ea_find ef;
193 int error;
194
195 ef.type = type;
196 ef.name = name;
197 ef.namel = strlen(name);
198 ef.ef_el = el;
199
200 memset(el, 0, sizeof(struct gfs2_ea_location));
201
202 error = ea_foreach(ip, ea_find_i, &ef);
203 if (error > 0)
204 return 0;
205
206 return error;
207}
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
225 struct gfs2_ea_header *ea,
226 struct gfs2_ea_header *prev, void *private)
227{
228 int *leave = private;
229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
230 struct gfs2_rgrpd *rgd;
231 struct gfs2_holder rg_gh;
232 struct buffer_head *dibh;
233 __be64 *dataptrs;
234 u64 bn = 0;
235 u64 bstart = 0;
236 unsigned int blen = 0;
237 unsigned int blks = 0;
238 unsigned int x;
239 int error;
240
241 if (GFS2_EA_IS_STUFFED(ea))
242 return 0;
243
244 dataptrs = GFS2_EA2DATAPTRS(ea);
245 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
246 if (*dataptrs) {
247 blks++;
248 bn = be64_to_cpu(*dataptrs);
249 }
250 }
251 if (!blks)
252 return 0;
253
254 rgd = gfs2_blk2rgrpd(sdp, bn);
255 if (!rgd) {
256 gfs2_consist_inode(ip);
257 return -EIO;
258 }
259
260 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
261 if (error)
262 return error;
263
264 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
265 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
266 if (error)
267 goto out_gunlock;
268
269 gfs2_trans_add_bh(ip->i_gl, bh, 1);
270
271 dataptrs = GFS2_EA2DATAPTRS(ea);
272 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
273 if (!*dataptrs)
274 break;
275 bn = be64_to_cpu(*dataptrs);
276
277 if (bstart + blen == bn)
278 blen++;
279 else {
280 if (bstart)
281 gfs2_free_meta(ip, bstart, blen);
282 bstart = bn;
283 blen = 1;
284 }
285
286 *dataptrs = 0;
287 gfs2_add_inode_blocks(&ip->i_inode, -1);
288 }
289 if (bstart)
290 gfs2_free_meta(ip, bstart, blen);
291
292 if (prev && !leave) {
293 u32 len;
294
295 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
296 prev->ea_rec_len = cpu_to_be32(len);
297
298 if (GFS2_EA_IS_LAST(ea))
299 prev->ea_flags |= GFS2_EAFLAG_LAST;
300 } else {
301 ea->ea_type = GFS2_EATYPE_UNUSED;
302 ea->ea_num_ptrs = 0;
303 }
304
305 error = gfs2_meta_inode_buffer(ip, &dibh);
306 if (!error) {
307 ip->i_inode.i_ctime = CURRENT_TIME;
308 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
309 gfs2_dinode_out(ip, dibh->b_data);
310 brelse(dibh);
311 }
312
313 gfs2_trans_end(sdp);
314
315out_gunlock:
316 gfs2_glock_dq_uninit(&rg_gh);
317 return error;
318}
319
320static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
321 struct gfs2_ea_header *ea,
322 struct gfs2_ea_header *prev, int leave)
323{
324 struct gfs2_alloc *al;
325 int error;
326
327 al = gfs2_alloc_get(ip);
328 if (!al)
329 return -ENOMEM;
330
331 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
332 if (error)
333 goto out_alloc;
334
335 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
336
337 gfs2_quota_unhold(ip);
338out_alloc:
339 gfs2_alloc_put(ip);
340 return error;
341}
342
343struct ea_list {
344 struct gfs2_ea_request *ei_er;
345 unsigned int ei_size;
346};
347
348static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
349{
350 switch (ea->ea_type) {
351 case GFS2_EATYPE_USR:
352 return 5 + ea->ea_name_len + 1;
353 case GFS2_EATYPE_SYS:
354 return 7 + ea->ea_name_len + 1;
355 case GFS2_EATYPE_SECURITY:
356 return 9 + ea->ea_name_len + 1;
357 default:
358 return 0;
359 }
360}
361
362static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
363 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
364 void *private)
365{
366 struct ea_list *ei = private;
367 struct gfs2_ea_request *er = ei->ei_er;
368 unsigned int ea_size = gfs2_ea_strlen(ea);
369
370 if (ea->ea_type == GFS2_EATYPE_UNUSED)
371 return 0;
372
373 if (er->er_data_len) {
374 char *prefix = NULL;
375 unsigned int l = 0;
376 char c = 0;
377
378 if (ei->ei_size + ea_size > er->er_data_len)
379 return -ERANGE;
380
381 switch (ea->ea_type) {
382 case GFS2_EATYPE_USR:
383 prefix = "user.";
384 l = 5;
385 break;
386 case GFS2_EATYPE_SYS:
387 prefix = "system.";
388 l = 7;
389 break;
390 case GFS2_EATYPE_SECURITY:
391 prefix = "security.";
392 l = 9;
393 break;
394 }
395
396 BUG_ON(l == 0);
397
398 memcpy(er->er_data + ei->ei_size, prefix, l);
399 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
400 ea->ea_name_len);
401 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
402 }
403
404 ei->ei_size += ea_size;
405
406 return 0;
407}
408
409
410
411
412
413
414
415
416
417
418ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
419{
420 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
421 struct gfs2_ea_request er;
422 struct gfs2_holder i_gh;
423 int error;
424
425 memset(&er, 0, sizeof(struct gfs2_ea_request));
426 if (size) {
427 er.er_data = buffer;
428 er.er_data_len = size;
429 }
430
431 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
432 if (error)
433 return error;
434
435 if (ip->i_eattr) {
436 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
437
438 error = ea_foreach(ip, ea_list_i, &ei);
439 if (!error)
440 error = ei.ei_size;
441 }
442
443 gfs2_glock_dq_uninit(&i_gh);
444
445 return error;
446}
447
448
449
450
451
452
453
454
455
456
457
458static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
459 char *data)
460{
461 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
462 struct buffer_head **bh;
463 unsigned int amount = GFS2_EA_DATA_LEN(ea);
464 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
465 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
466 unsigned int x;
467 int error = 0;
468
469 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
470 if (!bh)
471 return -ENOMEM;
472
473 for (x = 0; x < nptrs; x++) {
474 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
475 bh + x);
476 if (error) {
477 while (x--)
478 brelse(bh[x]);
479 goto out;
480 }
481 dataptrs++;
482 }
483
484 for (x = 0; x < nptrs; x++) {
485 error = gfs2_meta_wait(sdp, bh[x]);
486 if (error) {
487 for (; x < nptrs; x++)
488 brelse(bh[x]);
489 goto out;
490 }
491 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
492 for (; x < nptrs; x++)
493 brelse(bh[x]);
494 error = -EIO;
495 goto out;
496 }
497
498 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
499 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
500
501 amount -= sdp->sd_jbsize;
502 data += sdp->sd_jbsize;
503
504 brelse(bh[x]);
505 }
506
507out:
508 kfree(bh);
509 return error;
510}
511
512static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
513 char *data, size_t size)
514{
515 int ret;
516 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
517 if (len > size)
518 return -ERANGE;
519
520 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
521 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
522 return len;
523 }
524 ret = ea_get_unstuffed(ip, el->el_ea, data);
525 if (ret < 0)
526 return ret;
527 return len;
528}
529
530int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
531{
532 struct gfs2_ea_location el;
533 int error;
534 int len;
535 char *data;
536
537 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
538 if (error)
539 return error;
540 if (!el.el_ea)
541 goto out;
542 if (!GFS2_EA_DATA_LEN(el.el_ea))
543 goto out;
544
545 len = GFS2_EA_DATA_LEN(el.el_ea);
546 data = kmalloc(len, GFP_NOFS);
547 error = -ENOMEM;
548 if (data == NULL)
549 goto out;
550
551 error = gfs2_ea_get_copy(ip, &el, data, len);
552 if (error == 0)
553 error = len;
554 *ppdata = data;
555out:
556 brelse(el.el_bh);
557 return error;
558}
559
560
561
562
563
564
565
566
567
568
569
570static int gfs2_xattr_get(struct dentry *dentry, const char *name,
571 void *buffer, size_t size, int type)
572{
573 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
574 struct gfs2_ea_location el;
575 int error;
576
577 if (!ip->i_eattr)
578 return -ENODATA;
579 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
580 return -EINVAL;
581
582 error = gfs2_ea_find(ip, type, name, &el);
583 if (error)
584 return error;
585 if (!el.el_ea)
586 return -ENODATA;
587 if (size)
588 error = gfs2_ea_get_copy(ip, &el, buffer, size);
589 else
590 error = GFS2_EA_DATA_LEN(el.el_ea);
591 brelse(el.el_bh);
592
593 return error;
594}
595
596
597
598
599
600
601
602
603
604static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
605{
606 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
607 struct gfs2_ea_header *ea;
608 unsigned int n = 1;
609 u64 block;
610 int error;
611
612 error = gfs2_alloc_block(ip, &block, &n);
613 if (error)
614 return error;
615 gfs2_trans_add_unrevoke(sdp, block, 1);
616 *bhp = gfs2_meta_new(ip->i_gl, block);
617 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
618 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
619 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
620
621 ea = GFS2_EA_BH2FIRST(*bhp);
622 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
623 ea->ea_type = GFS2_EATYPE_UNUSED;
624 ea->ea_flags = GFS2_EAFLAG_LAST;
625 ea->ea_num_ptrs = 0;
626
627 gfs2_add_inode_blocks(&ip->i_inode, 1);
628
629 return 0;
630}
631
632
633
634
635
636
637
638
639
640
641
642
643
644static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
645 struct gfs2_ea_request *er)
646{
647 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
648 int error;
649
650 ea->ea_data_len = cpu_to_be32(er->er_data_len);
651 ea->ea_name_len = er->er_name_len;
652 ea->ea_type = er->er_type;
653 ea->__pad = 0;
654
655 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
656
657 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
658 ea->ea_num_ptrs = 0;
659 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
660 } else {
661 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
662 const char *data = er->er_data;
663 unsigned int data_len = er->er_data_len;
664 unsigned int copy;
665 unsigned int x;
666
667 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
668 for (x = 0; x < ea->ea_num_ptrs; x++) {
669 struct buffer_head *bh;
670 u64 block;
671 int mh_size = sizeof(struct gfs2_meta_header);
672 unsigned int n = 1;
673
674 error = gfs2_alloc_block(ip, &block, &n);
675 if (error)
676 return error;
677 gfs2_trans_add_unrevoke(sdp, block, 1);
678 bh = gfs2_meta_new(ip->i_gl, block);
679 gfs2_trans_add_bh(ip->i_gl, bh, 1);
680 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
681
682 gfs2_add_inode_blocks(&ip->i_inode, 1);
683
684 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
685 data_len;
686 memcpy(bh->b_data + mh_size, data, copy);
687 if (copy < sdp->sd_jbsize)
688 memset(bh->b_data + mh_size + copy, 0,
689 sdp->sd_jbsize - copy);
690
691 *dataptr++ = cpu_to_be64(bh->b_blocknr);
692 data += copy;
693 data_len -= copy;
694
695 brelse(bh);
696 }
697
698 gfs2_assert_withdraw(sdp, !data_len);
699 }
700
701 return 0;
702}
703
704typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
705 struct gfs2_ea_request *er, void *private);
706
707static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
708 unsigned int blks,
709 ea_skeleton_call_t skeleton_call, void *private)
710{
711 struct gfs2_alloc *al;
712 struct buffer_head *dibh;
713 int error;
714
715 al = gfs2_alloc_get(ip);
716 if (!al)
717 return -ENOMEM;
718
719 error = gfs2_quota_lock_check(ip);
720 if (error)
721 goto out;
722
723 al->al_requested = blks;
724
725 error = gfs2_inplace_reserve(ip);
726 if (error)
727 goto out_gunlock_q;
728
729 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
730 blks + gfs2_rg_blocks(ip) +
731 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
732 if (error)
733 goto out_ipres;
734
735 error = skeleton_call(ip, er, private);
736 if (error)
737 goto out_end_trans;
738
739 error = gfs2_meta_inode_buffer(ip, &dibh);
740 if (!error) {
741 ip->i_inode.i_ctime = CURRENT_TIME;
742 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
743 gfs2_dinode_out(ip, dibh->b_data);
744 brelse(dibh);
745 }
746
747out_end_trans:
748 gfs2_trans_end(GFS2_SB(&ip->i_inode));
749out_ipres:
750 gfs2_inplace_release(ip);
751out_gunlock_q:
752 gfs2_quota_unlock(ip);
753out:
754 gfs2_alloc_put(ip);
755 return error;
756}
757
758static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
759 void *private)
760{
761 struct buffer_head *bh;
762 int error;
763
764 error = ea_alloc_blk(ip, &bh);
765 if (error)
766 return error;
767
768 ip->i_eattr = bh->b_blocknr;
769 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
770
771 brelse(bh);
772
773 return error;
774}
775
776
777
778
779
780
781
782
783
784static int ea_init(struct gfs2_inode *ip, int type, const char *name,
785 const void *data, size_t size)
786{
787 struct gfs2_ea_request er;
788 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
789 unsigned int blks = 1;
790
791 er.er_type = type;
792 er.er_name = name;
793 er.er_name_len = strlen(name);
794 er.er_data = (void *)data;
795 er.er_data_len = size;
796
797 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
798 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
799
800 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
801}
802
803static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
804{
805 u32 ea_size = GFS2_EA_SIZE(ea);
806 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
807 ea_size);
808 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
809 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
810
811 ea->ea_rec_len = cpu_to_be32(ea_size);
812 ea->ea_flags ^= last;
813
814 new->ea_rec_len = cpu_to_be32(new_size);
815 new->ea_flags = last;
816
817 return new;
818}
819
820static void ea_set_remove_stuffed(struct gfs2_inode *ip,
821 struct gfs2_ea_location *el)
822{
823 struct gfs2_ea_header *ea = el->el_ea;
824 struct gfs2_ea_header *prev = el->el_prev;
825 u32 len;
826
827 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
828
829 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
830 ea->ea_type = GFS2_EATYPE_UNUSED;
831 return;
832 } else if (GFS2_EA2NEXT(prev) != ea) {
833 prev = GFS2_EA2NEXT(prev);
834 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
835 }
836
837 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
838 prev->ea_rec_len = cpu_to_be32(len);
839
840 if (GFS2_EA_IS_LAST(ea))
841 prev->ea_flags |= GFS2_EAFLAG_LAST;
842}
843
844struct ea_set {
845 int ea_split;
846
847 struct gfs2_ea_request *es_er;
848 struct gfs2_ea_location *es_el;
849
850 struct buffer_head *es_bh;
851 struct gfs2_ea_header *es_ea;
852};
853
854static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
855 struct gfs2_ea_header *ea, struct ea_set *es)
856{
857 struct gfs2_ea_request *er = es->es_er;
858 struct buffer_head *dibh;
859 int error;
860
861 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
862 if (error)
863 return error;
864
865 gfs2_trans_add_bh(ip->i_gl, bh, 1);
866
867 if (es->ea_split)
868 ea = ea_split_ea(ea);
869
870 ea_write(ip, ea, er);
871
872 if (es->es_el)
873 ea_set_remove_stuffed(ip, es->es_el);
874
875 error = gfs2_meta_inode_buffer(ip, &dibh);
876 if (error)
877 goto out;
878 ip->i_inode.i_ctime = CURRENT_TIME;
879 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
880 gfs2_dinode_out(ip, dibh->b_data);
881 brelse(dibh);
882out:
883 gfs2_trans_end(GFS2_SB(&ip->i_inode));
884 return error;
885}
886
887static int ea_set_simple_alloc(struct gfs2_inode *ip,
888 struct gfs2_ea_request *er, void *private)
889{
890 struct ea_set *es = private;
891 struct gfs2_ea_header *ea = es->es_ea;
892 int error;
893
894 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
895
896 if (es->ea_split)
897 ea = ea_split_ea(ea);
898
899 error = ea_write(ip, ea, er);
900 if (error)
901 return error;
902
903 if (es->es_el)
904 ea_set_remove_stuffed(ip, es->es_el);
905
906 return 0;
907}
908
909static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
910 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
911 void *private)
912{
913 struct ea_set *es = private;
914 unsigned int size;
915 int stuffed;
916 int error;
917
918 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
919 es->es_er->er_data_len, &size);
920
921 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
922 if (GFS2_EA_REC_LEN(ea) < size)
923 return 0;
924 if (!GFS2_EA_IS_STUFFED(ea)) {
925 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
926 if (error)
927 return error;
928 }
929 es->ea_split = 0;
930 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
931 es->ea_split = 1;
932 else
933 return 0;
934
935 if (stuffed) {
936 error = ea_set_simple_noalloc(ip, bh, ea, es);
937 if (error)
938 return error;
939 } else {
940 unsigned int blks;
941
942 es->es_bh = bh;
943 es->es_ea = ea;
944 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
945 GFS2_SB(&ip->i_inode)->sd_jbsize);
946
947 error = ea_alloc_skeleton(ip, es->es_er, blks,
948 ea_set_simple_alloc, es);
949 if (error)
950 return error;
951 }
952
953 return 1;
954}
955
956static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
957 void *private)
958{
959 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
960 struct buffer_head *indbh, *newbh;
961 __be64 *eablk;
962 int error;
963 int mh_size = sizeof(struct gfs2_meta_header);
964
965 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
966 __be64 *end;
967
968 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
969 &indbh);
970 if (error)
971 return error;
972
973 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
974 error = -EIO;
975 goto out;
976 }
977
978 eablk = (__be64 *)(indbh->b_data + mh_size);
979 end = eablk + sdp->sd_inptrs;
980
981 for (; eablk < end; eablk++)
982 if (!*eablk)
983 break;
984
985 if (eablk == end) {
986 error = -ENOSPC;
987 goto out;
988 }
989
990 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
991 } else {
992 u64 blk;
993 unsigned int n = 1;
994 error = gfs2_alloc_block(ip, &blk, &n);
995 if (error)
996 return error;
997 gfs2_trans_add_unrevoke(sdp, blk, 1);
998 indbh = gfs2_meta_new(ip->i_gl, blk);
999 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1000 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1001 gfs2_buffer_clear_tail(indbh, mh_size);
1002
1003 eablk = (__be64 *)(indbh->b_data + mh_size);
1004 *eablk = cpu_to_be64(ip->i_eattr);
1005 ip->i_eattr = blk;
1006 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1007 gfs2_add_inode_blocks(&ip->i_inode, 1);
1008
1009 eablk++;
1010 }
1011
1012 error = ea_alloc_blk(ip, &newbh);
1013 if (error)
1014 goto out;
1015
1016 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1017 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1018 brelse(newbh);
1019 if (error)
1020 goto out;
1021
1022 if (private)
1023 ea_set_remove_stuffed(ip, private);
1024
1025out:
1026 brelse(indbh);
1027 return error;
1028}
1029
1030static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1031 const void *value, size_t size, struct gfs2_ea_location *el)
1032{
1033 struct gfs2_ea_request er;
1034 struct ea_set es;
1035 unsigned int blks = 2;
1036 int error;
1037
1038 er.er_type = type;
1039 er.er_name = name;
1040 er.er_data = (void *)value;
1041 er.er_name_len = strlen(name);
1042 er.er_data_len = size;
1043
1044 memset(&es, 0, sizeof(struct ea_set));
1045 es.es_er = &er;
1046 es.es_el = el;
1047
1048 error = ea_foreach(ip, ea_set_simple, &es);
1049 if (error > 0)
1050 return 0;
1051 if (error)
1052 return error;
1053
1054 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1055 blks++;
1056 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1057 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1058
1059 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1060}
1061
1062static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1063 struct gfs2_ea_location *el)
1064{
1065 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1066 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1067 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1068 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1069 }
1070
1071 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1072}
1073
1074static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1075{
1076 struct gfs2_ea_header *ea = el->el_ea;
1077 struct gfs2_ea_header *prev = el->el_prev;
1078 struct buffer_head *dibh;
1079 int error;
1080
1081 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1082 if (error)
1083 return error;
1084
1085 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1086
1087 if (prev) {
1088 u32 len;
1089
1090 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1091 prev->ea_rec_len = cpu_to_be32(len);
1092
1093 if (GFS2_EA_IS_LAST(ea))
1094 prev->ea_flags |= GFS2_EAFLAG_LAST;
1095 } else {
1096 ea->ea_type = GFS2_EATYPE_UNUSED;
1097 }
1098
1099 error = gfs2_meta_inode_buffer(ip, &dibh);
1100 if (!error) {
1101 ip->i_inode.i_ctime = CURRENT_TIME;
1102 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1103 gfs2_dinode_out(ip, dibh->b_data);
1104 brelse(dibh);
1105 }
1106
1107 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1108
1109 return error;
1110}
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1126{
1127 struct gfs2_ea_location el;
1128 int error;
1129
1130 if (!ip->i_eattr)
1131 return -ENODATA;
1132
1133 error = gfs2_ea_find(ip, type, name, &el);
1134 if (error)
1135 return error;
1136 if (!el.el_ea)
1137 return -ENODATA;
1138
1139 if (GFS2_EA_IS_STUFFED(el.el_ea))
1140 error = ea_remove_stuffed(ip, &el);
1141 else
1142 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1143
1144 brelse(el.el_bh);
1145
1146 return error;
1147}
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163int __gfs2_xattr_set(struct inode *inode, const char *name,
1164 const void *value, size_t size, int flags, int type)
1165{
1166 struct gfs2_inode *ip = GFS2_I(inode);
1167 struct gfs2_sbd *sdp = GFS2_SB(inode);
1168 struct gfs2_ea_location el;
1169 unsigned int namel = strlen(name);
1170 int error;
1171
1172 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1173 return -EPERM;
1174 if (namel > GFS2_EA_MAX_NAME_LEN)
1175 return -ERANGE;
1176
1177 if (value == NULL)
1178 return gfs2_xattr_remove(ip, type, name);
1179
1180 if (ea_check_size(sdp, namel, size))
1181 return -ERANGE;
1182
1183 if (!ip->i_eattr) {
1184 if (flags & XATTR_REPLACE)
1185 return -ENODATA;
1186 return ea_init(ip, type, name, value, size);
1187 }
1188
1189 error = gfs2_ea_find(ip, type, name, &el);
1190 if (error)
1191 return error;
1192
1193 if (el.el_ea) {
1194 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1195 brelse(el.el_bh);
1196 return -EPERM;
1197 }
1198
1199 error = -EEXIST;
1200 if (!(flags & XATTR_CREATE)) {
1201 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1202 error = ea_set_i(ip, type, name, value, size, &el);
1203 if (!error && unstuffed)
1204 ea_set_remove_unstuffed(ip, &el);
1205 }
1206
1207 brelse(el.el_bh);
1208 return error;
1209 }
1210
1211 error = -ENODATA;
1212 if (!(flags & XATTR_REPLACE))
1213 error = ea_set_i(ip, type, name, value, size, NULL);
1214
1215 return error;
1216}
1217
1218static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1219 const void *value, size_t size, int flags, int type)
1220{
1221 return __gfs2_xattr_set(dentry->d_inode, name, value,
1222 size, flags, type);
1223}
1224
1225static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1226 struct gfs2_ea_header *ea, char *data)
1227{
1228 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1229 struct buffer_head **bh;
1230 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1231 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1232 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1233 unsigned int x;
1234 int error;
1235
1236 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1237 if (!bh)
1238 return -ENOMEM;
1239
1240 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1241 if (error)
1242 goto out;
1243
1244 for (x = 0; x < nptrs; x++) {
1245 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1246 bh + x);
1247 if (error) {
1248 while (x--)
1249 brelse(bh[x]);
1250 goto fail;
1251 }
1252 dataptrs++;
1253 }
1254
1255 for (x = 0; x < nptrs; x++) {
1256 error = gfs2_meta_wait(sdp, bh[x]);
1257 if (error) {
1258 for (; x < nptrs; x++)
1259 brelse(bh[x]);
1260 goto fail;
1261 }
1262 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1263 for (; x < nptrs; x++)
1264 brelse(bh[x]);
1265 error = -EIO;
1266 goto fail;
1267 }
1268
1269 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1270
1271 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1272 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1273
1274 amount -= sdp->sd_jbsize;
1275 data += sdp->sd_jbsize;
1276
1277 brelse(bh[x]);
1278 }
1279
1280out:
1281 kfree(bh);
1282 return error;
1283
1284fail:
1285 gfs2_trans_end(sdp);
1286 kfree(bh);
1287 return error;
1288}
1289
1290int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1291{
1292 struct inode *inode = &ip->i_inode;
1293 struct gfs2_sbd *sdp = GFS2_SB(inode);
1294 struct gfs2_ea_location el;
1295 int error;
1296
1297 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1298 if (error)
1299 return error;
1300
1301 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1302 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1303 if (error == 0) {
1304 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1305 memcpy(GFS2_EA2DATA(el.el_ea), data,
1306 GFS2_EA_DATA_LEN(el.el_ea));
1307 }
1308 } else {
1309 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1310 }
1311
1312 brelse(el.el_bh);
1313 if (error)
1314 return error;
1315
1316 error = gfs2_setattr_simple(inode, attr);
1317 gfs2_trans_end(sdp);
1318 return error;
1319}
1320
1321static int ea_dealloc_indirect(struct gfs2_inode *ip)
1322{
1323 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1324 struct gfs2_rgrp_list rlist;
1325 struct buffer_head *indbh, *dibh;
1326 __be64 *eablk, *end;
1327 unsigned int rg_blocks = 0;
1328 u64 bstart = 0;
1329 unsigned int blen = 0;
1330 unsigned int blks = 0;
1331 unsigned int x;
1332 int error;
1333
1334 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1335
1336 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1337 if (error)
1338 return error;
1339
1340 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1341 error = -EIO;
1342 goto out;
1343 }
1344
1345 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1346 end = eablk + sdp->sd_inptrs;
1347
1348 for (; eablk < end; eablk++) {
1349 u64 bn;
1350
1351 if (!*eablk)
1352 break;
1353 bn = be64_to_cpu(*eablk);
1354
1355 if (bstart + blen == bn)
1356 blen++;
1357 else {
1358 if (bstart)
1359 gfs2_rlist_add(ip, &rlist, bstart);
1360 bstart = bn;
1361 blen = 1;
1362 }
1363 blks++;
1364 }
1365 if (bstart)
1366 gfs2_rlist_add(ip, &rlist, bstart);
1367 else
1368 goto out;
1369
1370 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1371
1372 for (x = 0; x < rlist.rl_rgrps; x++) {
1373 struct gfs2_rgrpd *rgd;
1374 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1375 rg_blocks += rgd->rd_length;
1376 }
1377
1378 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1379 if (error)
1380 goto out_rlist_free;
1381
1382 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1383 RES_STATFS + RES_QUOTA, blks);
1384 if (error)
1385 goto out_gunlock;
1386
1387 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1388
1389 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1390 bstart = 0;
1391 blen = 0;
1392
1393 for (; eablk < end; eablk++) {
1394 u64 bn;
1395
1396 if (!*eablk)
1397 break;
1398 bn = be64_to_cpu(*eablk);
1399
1400 if (bstart + blen == bn)
1401 blen++;
1402 else {
1403 if (bstart)
1404 gfs2_free_meta(ip, bstart, blen);
1405 bstart = bn;
1406 blen = 1;
1407 }
1408
1409 *eablk = 0;
1410 gfs2_add_inode_blocks(&ip->i_inode, -1);
1411 }
1412 if (bstart)
1413 gfs2_free_meta(ip, bstart, blen);
1414
1415 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1416
1417 error = gfs2_meta_inode_buffer(ip, &dibh);
1418 if (!error) {
1419 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1420 gfs2_dinode_out(ip, dibh->b_data);
1421 brelse(dibh);
1422 }
1423
1424 gfs2_trans_end(sdp);
1425
1426out_gunlock:
1427 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1428out_rlist_free:
1429 gfs2_rlist_free(&rlist);
1430out:
1431 brelse(indbh);
1432 return error;
1433}
1434
1435static int ea_dealloc_block(struct gfs2_inode *ip)
1436{
1437 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1438 struct gfs2_alloc *al = ip->i_alloc;
1439 struct gfs2_rgrpd *rgd;
1440 struct buffer_head *dibh;
1441 int error;
1442
1443 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1444 if (!rgd) {
1445 gfs2_consist_inode(ip);
1446 return -EIO;
1447 }
1448
1449 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1450 &al->al_rgd_gh);
1451 if (error)
1452 return error;
1453
1454 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1455 RES_QUOTA, 1);
1456 if (error)
1457 goto out_gunlock;
1458
1459 gfs2_free_meta(ip, ip->i_eattr, 1);
1460
1461 ip->i_eattr = 0;
1462 gfs2_add_inode_blocks(&ip->i_inode, -1);
1463
1464 error = gfs2_meta_inode_buffer(ip, &dibh);
1465 if (!error) {
1466 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1467 gfs2_dinode_out(ip, dibh->b_data);
1468 brelse(dibh);
1469 }
1470
1471 gfs2_trans_end(sdp);
1472
1473out_gunlock:
1474 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1475 return error;
1476}
1477
1478
1479
1480
1481
1482
1483
1484
1485int gfs2_ea_dealloc(struct gfs2_inode *ip)
1486{
1487 struct gfs2_alloc *al;
1488 int error;
1489
1490 al = gfs2_alloc_get(ip);
1491 if (!al)
1492 return -ENOMEM;
1493
1494 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1495 if (error)
1496 goto out_alloc;
1497
1498 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1499 if (error)
1500 goto out_quota;
1501
1502 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1503 error = ea_dealloc_indirect(ip);
1504 if (error)
1505 goto out_quota;
1506 }
1507
1508 error = ea_dealloc_block(ip);
1509
1510out_quota:
1511 gfs2_quota_unhold(ip);
1512out_alloc:
1513 gfs2_alloc_put(ip);
1514 return error;
1515}
1516
1517static const struct xattr_handler gfs2_xattr_user_handler = {
1518 .prefix = XATTR_USER_PREFIX,
1519 .flags = GFS2_EATYPE_USR,
1520 .get = gfs2_xattr_get,
1521 .set = gfs2_xattr_set,
1522};
1523
1524static const struct xattr_handler gfs2_xattr_security_handler = {
1525 .prefix = XATTR_SECURITY_PREFIX,
1526 .flags = GFS2_EATYPE_SECURITY,
1527 .get = gfs2_xattr_get,
1528 .set = gfs2_xattr_set,
1529};
1530
1531const struct xattr_handler *gfs2_xattr_handlers[] = {
1532 &gfs2_xattr_user_handler,
1533 &gfs2_xattr_security_handler,
1534 &gfs2_xattr_system_handler,
1535 NULL,
1536};
1537
1538
