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7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/xattr.h>
12#include <linux/gfs2_ondisk.h>
13#include <linux/posix_acl_xattr.h>
14#include <linux/uaccess.h>
15
16#include "gfs2.h"
17#include "incore.h"
18#include "acl.h"
19#include "xattr.h"
20#include "glock.h"
21#include "inode.h"
22#include "meta_io.h"
23#include "quota.h"
24#include "rgrp.h"
25#include "super.h"
26#include "trans.h"
27#include "util.h"
28
29
30
31
32
33
34
35
36
37
38
39static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
40 unsigned int *size)
41{
42 unsigned int jbsize = sdp->sd_jbsize;
43
44
45 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
46
47 if (*size <= jbsize)
48 return 1;
49
50
51 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
52 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
53
54 return 0;
55}
56
57static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
58{
59 unsigned int size;
60
61 if (dsize > GFS2_EA_MAX_DATA_LEN)
62 return -ERANGE;
63
64 ea_calc_size(sdp, nsize, dsize, &size);
65
66
67 if (size > sdp->sd_jbsize)
68 return -ERANGE;
69
70 return 0;
71}
72
73typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
74 struct gfs2_ea_header *ea,
75 struct gfs2_ea_header *prev, void *private);
76
77static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
78 ea_call_t ea_call, void *data)
79{
80 struct gfs2_ea_header *ea, *prev = NULL;
81 int error = 0;
82
83 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
84 return -EIO;
85
86 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
87 if (!GFS2_EA_REC_LEN(ea))
88 goto fail;
89 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
90 bh->b_data + bh->b_size))
91 goto fail;
92 if (!GFS2_EATYPE_VALID(ea->ea_type))
93 goto fail;
94
95 error = ea_call(ip, bh, ea, prev, data);
96 if (error)
97 return error;
98
99 if (GFS2_EA_IS_LAST(ea)) {
100 if ((char *)GFS2_EA2NEXT(ea) !=
101 bh->b_data + bh->b_size)
102 goto fail;
103 break;
104 }
105 }
106
107 return error;
108
109fail:
110 gfs2_consist_inode(ip);
111 return -EIO;
112}
113
114static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
115{
116 struct buffer_head *bh, *eabh;
117 __be64 *eablk, *end;
118 int error;
119
120 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
121 if (error)
122 return error;
123
124 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
125 error = ea_foreach_i(ip, bh, ea_call, data);
126 goto out;
127 }
128
129 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
130 error = -EIO;
131 goto out;
132 }
133
134 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
135 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
136
137 for (; eablk < end; eablk++) {
138 u64 bn;
139
140 if (!*eablk)
141 break;
142 bn = be64_to_cpu(*eablk);
143
144 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
145 if (error)
146 break;
147 error = ea_foreach_i(ip, eabh, ea_call, data);
148 brelse(eabh);
149 if (error)
150 break;
151 }
152out:
153 brelse(bh);
154 return error;
155}
156
157struct ea_find {
158 int type;
159 const char *name;
160 size_t namel;
161 struct gfs2_ea_location *ef_el;
162};
163
164static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
165 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
166 void *private)
167{
168 struct ea_find *ef = private;
169
170 if (ea->ea_type == GFS2_EATYPE_UNUSED)
171 return 0;
172
173 if (ea->ea_type == ef->type) {
174 if (ea->ea_name_len == ef->namel &&
175 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
176 struct gfs2_ea_location *el = ef->ef_el;
177 get_bh(bh);
178 el->el_bh = bh;
179 el->el_ea = ea;
180 el->el_prev = prev;
181 return 1;
182 }
183 }
184
185 return 0;
186}
187
188static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
189 struct gfs2_ea_location *el)
190{
191 struct ea_find ef;
192 int error;
193
194 ef.type = type;
195 ef.name = name;
196 ef.namel = strlen(name);
197 ef.ef_el = el;
198
199 memset(el, 0, sizeof(struct gfs2_ea_location));
200
201 error = ea_foreach(ip, ea_find_i, &ef);
202 if (error > 0)
203 return 0;
204
205 return error;
206}
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
224 struct gfs2_ea_header *ea,
225 struct gfs2_ea_header *prev, void *private)
226{
227 int *leave = private;
228 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
229 struct gfs2_rgrpd *rgd;
230 struct gfs2_holder rg_gh;
231 __be64 *dataptrs;
232 u64 bn = 0;
233 u64 bstart = 0;
234 unsigned int blen = 0;
235 unsigned int blks = 0;
236 unsigned int x;
237 int error;
238
239 error = gfs2_rindex_update(sdp);
240 if (error)
241 return error;
242
243 if (GFS2_EA_IS_STUFFED(ea))
244 return 0;
245
246 dataptrs = GFS2_EA2DATAPTRS(ea);
247 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
248 if (*dataptrs) {
249 blks++;
250 bn = be64_to_cpu(*dataptrs);
251 }
252 }
253 if (!blks)
254 return 0;
255
256 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
257 if (!rgd) {
258 gfs2_consist_inode(ip);
259 return -EIO;
260 }
261
262 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
263 if (error)
264 return error;
265
266 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
267 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
268 if (error)
269 goto out_gunlock;
270
271 gfs2_trans_add_meta(ip->i_gl, bh);
272
273 dataptrs = GFS2_EA2DATAPTRS(ea);
274 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
275 if (!*dataptrs)
276 break;
277 bn = be64_to_cpu(*dataptrs);
278
279 if (bstart + blen == bn)
280 blen++;
281 else {
282 if (bstart)
283 gfs2_free_meta(ip, rgd, bstart, blen);
284 bstart = bn;
285 blen = 1;
286 }
287
288 *dataptrs = 0;
289 gfs2_add_inode_blocks(&ip->i_inode, -1);
290 }
291 if (bstart)
292 gfs2_free_meta(ip, rgd, bstart, blen);
293
294 if (prev && !leave) {
295 u32 len;
296
297 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
298 prev->ea_rec_len = cpu_to_be32(len);
299
300 if (GFS2_EA_IS_LAST(ea))
301 prev->ea_flags |= GFS2_EAFLAG_LAST;
302 } else {
303 ea->ea_type = GFS2_EATYPE_UNUSED;
304 ea->ea_num_ptrs = 0;
305 }
306
307 ip->i_inode.i_ctime = current_time(&ip->i_inode);
308 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
309
310 gfs2_trans_end(sdp);
311
312out_gunlock:
313 gfs2_glock_dq_uninit(&rg_gh);
314 return error;
315}
316
317static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
318 struct gfs2_ea_header *ea,
319 struct gfs2_ea_header *prev, int leave)
320{
321 int error;
322
323 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
324 if (error)
325 return error;
326
327 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
328 if (error)
329 goto out_alloc;
330
331 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
332
333 gfs2_quota_unhold(ip);
334out_alloc:
335 return error;
336}
337
338struct ea_list {
339 struct gfs2_ea_request *ei_er;
340 unsigned int ei_size;
341};
342
343static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
344 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
345 void *private)
346{
347 struct ea_list *ei = private;
348 struct gfs2_ea_request *er = ei->ei_er;
349 unsigned int ea_size;
350 char *prefix;
351 unsigned int l;
352
353 if (ea->ea_type == GFS2_EATYPE_UNUSED)
354 return 0;
355
356 switch (ea->ea_type) {
357 case GFS2_EATYPE_USR:
358 prefix = "user.";
359 l = 5;
360 break;
361 case GFS2_EATYPE_SYS:
362 prefix = "system.";
363 l = 7;
364 break;
365 case GFS2_EATYPE_SECURITY:
366 prefix = "security.";
367 l = 9;
368 break;
369 default:
370 BUG();
371 }
372
373 ea_size = l + ea->ea_name_len + 1;
374 if (er->er_data_len) {
375 if (ei->ei_size + ea_size > er->er_data_len)
376 return -ERANGE;
377
378 memcpy(er->er_data + ei->ei_size, prefix, l);
379 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
380 ea->ea_name_len);
381 er->er_data[ei->ei_size + ea_size - 1] = 0;
382 }
383
384 ei->ei_size += ea_size;
385
386 return 0;
387}
388
389
390
391
392
393
394
395
396
397
398ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
399{
400 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
401 struct gfs2_ea_request er;
402 struct gfs2_holder i_gh;
403 int error;
404
405 memset(&er, 0, sizeof(struct gfs2_ea_request));
406 if (size) {
407 er.er_data = buffer;
408 er.er_data_len = size;
409 }
410
411 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
412 if (error)
413 return error;
414
415 if (ip->i_eattr) {
416 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
417
418 error = ea_foreach(ip, ea_list_i, &ei);
419 if (!error)
420 error = ei.ei_size;
421 }
422
423 gfs2_glock_dq_uninit(&i_gh);
424
425 return error;
426}
427
428
429
430
431
432
433
434
435
436
437
438
439static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
440 const char *din, char *dout)
441{
442 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
443 struct buffer_head **bh;
444 unsigned int amount = GFS2_EA_DATA_LEN(ea);
445 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
446 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
447 unsigned int x;
448 int error = 0;
449 unsigned char *pos;
450 unsigned cp_size;
451
452 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
453 if (!bh)
454 return -ENOMEM;
455
456 for (x = 0; x < nptrs; x++) {
457 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
458 bh + x);
459 if (error) {
460 while (x--)
461 brelse(bh[x]);
462 goto out;
463 }
464 dataptrs++;
465 }
466
467 for (x = 0; x < nptrs; x++) {
468 error = gfs2_meta_wait(sdp, bh[x]);
469 if (error) {
470 for (; x < nptrs; x++)
471 brelse(bh[x]);
472 goto out;
473 }
474 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
475 for (; x < nptrs; x++)
476 brelse(bh[x]);
477 error = -EIO;
478 goto out;
479 }
480
481 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
482 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
483
484 if (dout) {
485 memcpy(dout, pos, cp_size);
486 dout += sdp->sd_jbsize;
487 }
488
489 if (din) {
490 gfs2_trans_add_meta(ip->i_gl, bh[x]);
491 memcpy(pos, din, cp_size);
492 din += sdp->sd_jbsize;
493 }
494
495 amount -= sdp->sd_jbsize;
496 brelse(bh[x]);
497 }
498
499out:
500 kfree(bh);
501 return error;
502}
503
504static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
505 char *data, size_t size)
506{
507 int ret;
508 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
509 if (len > size)
510 return -ERANGE;
511
512 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
513 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
514 return len;
515 }
516 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
517 if (ret < 0)
518 return ret;
519 return len;
520}
521
522int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
523{
524 struct gfs2_ea_location el;
525 int error;
526 int len;
527 char *data;
528
529 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
530 if (error)
531 return error;
532 if (!el.el_ea)
533 goto out;
534 if (!GFS2_EA_DATA_LEN(el.el_ea))
535 goto out;
536
537 len = GFS2_EA_DATA_LEN(el.el_ea);
538 data = kmalloc(len, GFP_NOFS);
539 error = -ENOMEM;
540 if (data == NULL)
541 goto out;
542
543 error = gfs2_ea_get_copy(ip, &el, data, len);
544 if (error < 0)
545 kfree(data);
546 else
547 *ppdata = data;
548out:
549 brelse(el.el_bh);
550 return error;
551}
552
553
554
555
556
557
558
559
560
561
562
563static int __gfs2_xattr_get(struct inode *inode, const char *name,
564 void *buffer, size_t size, int type)
565{
566 struct gfs2_inode *ip = GFS2_I(inode);
567 struct gfs2_ea_location el;
568 int error;
569
570 if (!ip->i_eattr)
571 return -ENODATA;
572 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
573 return -EINVAL;
574
575 error = gfs2_ea_find(ip, type, name, &el);
576 if (error)
577 return error;
578 if (!el.el_ea)
579 return -ENODATA;
580 if (size)
581 error = gfs2_ea_get_copy(ip, &el, buffer, size);
582 else
583 error = GFS2_EA_DATA_LEN(el.el_ea);
584 brelse(el.el_bh);
585
586 return error;
587}
588
589static int gfs2_xattr_get(const struct xattr_handler *handler,
590 struct dentry *unused, struct inode *inode,
591 const char *name, void *buffer, size_t size)
592{
593 struct gfs2_inode *ip = GFS2_I(inode);
594 struct gfs2_holder gh;
595 int ret;
596
597
598
599 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
600 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
601 if (ret)
602 return ret;
603 } else {
604 gfs2_holder_mark_uninitialized(&gh);
605 }
606 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
607 if (gfs2_holder_initialized(&gh))
608 gfs2_glock_dq_uninit(&gh);
609 return ret;
610}
611
612
613
614
615
616
617
618
619
620static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
621{
622 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
623 struct gfs2_ea_header *ea;
624 unsigned int n = 1;
625 u64 block;
626 int error;
627
628 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
629 if (error)
630 return error;
631 gfs2_trans_remove_revoke(sdp, block, 1);
632 *bhp = gfs2_meta_new(ip->i_gl, block);
633 gfs2_trans_add_meta(ip->i_gl, *bhp);
634 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
635 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
636
637 ea = GFS2_EA_BH2FIRST(*bhp);
638 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
639 ea->ea_type = GFS2_EATYPE_UNUSED;
640 ea->ea_flags = GFS2_EAFLAG_LAST;
641 ea->ea_num_ptrs = 0;
642
643 gfs2_add_inode_blocks(&ip->i_inode, 1);
644
645 return 0;
646}
647
648
649
650
651
652
653
654
655
656
657
658
659
660static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
661 struct gfs2_ea_request *er)
662{
663 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
664 int error;
665
666 ea->ea_data_len = cpu_to_be32(er->er_data_len);
667 ea->ea_name_len = er->er_name_len;
668 ea->ea_type = er->er_type;
669 ea->__pad = 0;
670
671 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
672
673 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
674 ea->ea_num_ptrs = 0;
675 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
676 } else {
677 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
678 const char *data = er->er_data;
679 unsigned int data_len = er->er_data_len;
680 unsigned int copy;
681 unsigned int x;
682
683 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
684 for (x = 0; x < ea->ea_num_ptrs; x++) {
685 struct buffer_head *bh;
686 u64 block;
687 int mh_size = sizeof(struct gfs2_meta_header);
688 unsigned int n = 1;
689
690 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
691 if (error)
692 return error;
693 gfs2_trans_remove_revoke(sdp, block, 1);
694 bh = gfs2_meta_new(ip->i_gl, block);
695 gfs2_trans_add_meta(ip->i_gl, bh);
696 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
697
698 gfs2_add_inode_blocks(&ip->i_inode, 1);
699
700 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
701 data_len;
702 memcpy(bh->b_data + mh_size, data, copy);
703 if (copy < sdp->sd_jbsize)
704 memset(bh->b_data + mh_size + copy, 0,
705 sdp->sd_jbsize - copy);
706
707 *dataptr++ = cpu_to_be64(bh->b_blocknr);
708 data += copy;
709 data_len -= copy;
710
711 brelse(bh);
712 }
713
714 gfs2_assert_withdraw(sdp, !data_len);
715 }
716
717 return 0;
718}
719
720typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
721 struct gfs2_ea_request *er, void *private);
722
723static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
724 unsigned int blks,
725 ea_skeleton_call_t skeleton_call, void *private)
726{
727 struct gfs2_alloc_parms ap = { .target = blks };
728 int error;
729
730 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
731 if (error)
732 return error;
733
734 error = gfs2_quota_lock_check(ip, &ap);
735 if (error)
736 return error;
737
738 error = gfs2_inplace_reserve(ip, &ap);
739 if (error)
740 goto out_gunlock_q;
741
742 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
743 blks + gfs2_rg_blocks(ip, blks) +
744 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
745 if (error)
746 goto out_ipres;
747
748 error = skeleton_call(ip, er, private);
749 if (error)
750 goto out_end_trans;
751
752 ip->i_inode.i_ctime = current_time(&ip->i_inode);
753 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
754
755out_end_trans:
756 gfs2_trans_end(GFS2_SB(&ip->i_inode));
757out_ipres:
758 gfs2_inplace_release(ip);
759out_gunlock_q:
760 gfs2_quota_unlock(ip);
761 return error;
762}
763
764static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
765 void *private)
766{
767 struct buffer_head *bh;
768 int error;
769
770 error = ea_alloc_blk(ip, &bh);
771 if (error)
772 return error;
773
774 ip->i_eattr = bh->b_blocknr;
775 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
776
777 brelse(bh);
778
779 return error;
780}
781
782
783
784
785
786
787
788
789
790static int ea_init(struct gfs2_inode *ip, int type, const char *name,
791 const void *data, size_t size)
792{
793 struct gfs2_ea_request er;
794 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
795 unsigned int blks = 1;
796
797 er.er_type = type;
798 er.er_name = name;
799 er.er_name_len = strlen(name);
800 er.er_data = (void *)data;
801 er.er_data_len = size;
802
803 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
804 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
805
806 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
807}
808
809static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
810{
811 u32 ea_size = GFS2_EA_SIZE(ea);
812 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
813 ea_size);
814 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
815 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
816
817 ea->ea_rec_len = cpu_to_be32(ea_size);
818 ea->ea_flags ^= last;
819
820 new->ea_rec_len = cpu_to_be32(new_size);
821 new->ea_flags = last;
822
823 return new;
824}
825
826static void ea_set_remove_stuffed(struct gfs2_inode *ip,
827 struct gfs2_ea_location *el)
828{
829 struct gfs2_ea_header *ea = el->el_ea;
830 struct gfs2_ea_header *prev = el->el_prev;
831 u32 len;
832
833 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
834
835 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
836 ea->ea_type = GFS2_EATYPE_UNUSED;
837 return;
838 } else if (GFS2_EA2NEXT(prev) != ea) {
839 prev = GFS2_EA2NEXT(prev);
840 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
841 }
842
843 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
844 prev->ea_rec_len = cpu_to_be32(len);
845
846 if (GFS2_EA_IS_LAST(ea))
847 prev->ea_flags |= GFS2_EAFLAG_LAST;
848}
849
850struct ea_set {
851 int ea_split;
852
853 struct gfs2_ea_request *es_er;
854 struct gfs2_ea_location *es_el;
855
856 struct buffer_head *es_bh;
857 struct gfs2_ea_header *es_ea;
858};
859
860static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
861 struct gfs2_ea_header *ea, struct ea_set *es)
862{
863 struct gfs2_ea_request *er = es->es_er;
864 int error;
865
866 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
867 if (error)
868 return error;
869
870 gfs2_trans_add_meta(ip->i_gl, bh);
871
872 if (es->ea_split)
873 ea = ea_split_ea(ea);
874
875 ea_write(ip, ea, er);
876
877 if (es->es_el)
878 ea_set_remove_stuffed(ip, es->es_el);
879
880 ip->i_inode.i_ctime = current_time(&ip->i_inode);
881 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
882
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_meta(ip->i_gl, es->es_bh);
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, 0,
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_meta(ip->i_gl, indbh);
991 } else {
992 u64 blk;
993 unsigned int n = 1;
994 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
995 if (error)
996 return error;
997 gfs2_trans_remove_revoke(sdp, blk, 1);
998 indbh = gfs2_meta_new(ip->i_gl, blk);
999 gfs2_trans_add_meta(ip->i_gl, indbh);
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 int error;
1079
1080 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1081 if (error)
1082 return error;
1083
1084 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1085
1086 if (prev) {
1087 u32 len;
1088
1089 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1090 prev->ea_rec_len = cpu_to_be32(len);
1091
1092 if (GFS2_EA_IS_LAST(ea))
1093 prev->ea_flags |= GFS2_EAFLAG_LAST;
1094 } else {
1095 ea->ea_type = GFS2_EATYPE_UNUSED;
1096 }
1097
1098 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1099 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1100
1101 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1102
1103 return error;
1104}
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1120{
1121 struct gfs2_ea_location el;
1122 int error;
1123
1124 if (!ip->i_eattr)
1125 return -ENODATA;
1126
1127 error = gfs2_ea_find(ip, type, name, &el);
1128 if (error)
1129 return error;
1130 if (!el.el_ea)
1131 return -ENODATA;
1132
1133 if (GFS2_EA_IS_STUFFED(el.el_ea))
1134 error = ea_remove_stuffed(ip, &el);
1135 else
1136 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1137
1138 brelse(el.el_bh);
1139
1140 return error;
1141}
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157int __gfs2_xattr_set(struct inode *inode, const char *name,
1158 const void *value, size_t size, int flags, int type)
1159{
1160 struct gfs2_inode *ip = GFS2_I(inode);
1161 struct gfs2_sbd *sdp = GFS2_SB(inode);
1162 struct gfs2_ea_location el;
1163 unsigned int namel = strlen(name);
1164 int error;
1165
1166 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1167 return -EPERM;
1168 if (namel > GFS2_EA_MAX_NAME_LEN)
1169 return -ERANGE;
1170
1171 if (value == NULL) {
1172 error = gfs2_xattr_remove(ip, type, name);
1173 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1174 error = 0;
1175 return error;
1176 }
1177
1178 if (ea_check_size(sdp, namel, size))
1179 return -ERANGE;
1180
1181 if (!ip->i_eattr) {
1182 if (flags & XATTR_REPLACE)
1183 return -ENODATA;
1184 return ea_init(ip, type, name, value, size);
1185 }
1186
1187 error = gfs2_ea_find(ip, type, name, &el);
1188 if (error)
1189 return error;
1190
1191 if (el.el_ea) {
1192 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1193 brelse(el.el_bh);
1194 return -EPERM;
1195 }
1196
1197 error = -EEXIST;
1198 if (!(flags & XATTR_CREATE)) {
1199 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1200 error = ea_set_i(ip, type, name, value, size, &el);
1201 if (!error && unstuffed)
1202 ea_set_remove_unstuffed(ip, &el);
1203 }
1204
1205 brelse(el.el_bh);
1206 return error;
1207 }
1208
1209 error = -ENODATA;
1210 if (!(flags & XATTR_REPLACE))
1211 error = ea_set_i(ip, type, name, value, size, NULL);
1212
1213 return error;
1214}
1215
1216static int gfs2_xattr_set(const struct xattr_handler *handler,
1217 struct dentry *unused, struct inode *inode,
1218 const char *name, const void *value,
1219 size_t size, int flags)
1220{
1221 struct gfs2_inode *ip = GFS2_I(inode);
1222 struct gfs2_holder gh;
1223 int ret;
1224
1225 ret = gfs2_qa_get(ip);
1226 if (ret)
1227 return ret;
1228
1229
1230
1231 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1232 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1233 if (ret)
1234 goto out;
1235 } else {
1236 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1237 ret = -EIO;
1238 goto out;
1239 }
1240 gfs2_holder_mark_uninitialized(&gh);
1241 }
1242 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1243 if (gfs2_holder_initialized(&gh))
1244 gfs2_glock_dq_uninit(&gh);
1245out:
1246 gfs2_qa_put(ip);
1247 return ret;
1248}
1249
1250static int ea_dealloc_indirect(struct gfs2_inode *ip)
1251{
1252 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1253 struct gfs2_rgrp_list rlist;
1254 struct gfs2_rgrpd *rgd;
1255 struct buffer_head *indbh, *dibh;
1256 __be64 *eablk, *end;
1257 unsigned int rg_blocks = 0;
1258 u64 bstart = 0;
1259 unsigned int blen = 0;
1260 unsigned int blks = 0;
1261 unsigned int x;
1262 int error;
1263
1264 error = gfs2_rindex_update(sdp);
1265 if (error)
1266 return error;
1267
1268 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1269
1270 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1271 if (error)
1272 return error;
1273
1274 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1275 error = -EIO;
1276 goto out;
1277 }
1278
1279 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1280 end = eablk + sdp->sd_inptrs;
1281
1282 for (; eablk < end; eablk++) {
1283 u64 bn;
1284
1285 if (!*eablk)
1286 break;
1287 bn = be64_to_cpu(*eablk);
1288
1289 if (bstart + blen == bn)
1290 blen++;
1291 else {
1292 if (bstart)
1293 gfs2_rlist_add(ip, &rlist, bstart);
1294 bstart = bn;
1295 blen = 1;
1296 }
1297 blks++;
1298 }
1299 if (bstart)
1300 gfs2_rlist_add(ip, &rlist, bstart);
1301 else
1302 goto out;
1303
1304 gfs2_rlist_alloc(&rlist);
1305
1306 for (x = 0; x < rlist.rl_rgrps; x++) {
1307 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1308 rg_blocks += rgd->rd_length;
1309 }
1310
1311 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1312 if (error)
1313 goto out_rlist_free;
1314
1315 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1316 RES_STATFS + RES_QUOTA, blks);
1317 if (error)
1318 goto out_gunlock;
1319
1320 gfs2_trans_add_meta(ip->i_gl, indbh);
1321
1322 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1323 bstart = 0;
1324 rgd = NULL;
1325 blen = 0;
1326
1327 for (; eablk < end; eablk++) {
1328 u64 bn;
1329
1330 if (!*eablk)
1331 break;
1332 bn = be64_to_cpu(*eablk);
1333
1334 if (bstart + blen == bn)
1335 blen++;
1336 else {
1337 if (bstart)
1338 gfs2_free_meta(ip, rgd, bstart, blen);
1339 bstart = bn;
1340 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1341 blen = 1;
1342 }
1343
1344 *eablk = 0;
1345 gfs2_add_inode_blocks(&ip->i_inode, -1);
1346 }
1347 if (bstart)
1348 gfs2_free_meta(ip, rgd, bstart, blen);
1349
1350 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1351
1352 error = gfs2_meta_inode_buffer(ip, &dibh);
1353 if (!error) {
1354 gfs2_trans_add_meta(ip->i_gl, dibh);
1355 gfs2_dinode_out(ip, dibh->b_data);
1356 brelse(dibh);
1357 }
1358
1359 gfs2_trans_end(sdp);
1360
1361out_gunlock:
1362 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1363out_rlist_free:
1364 gfs2_rlist_free(&rlist);
1365out:
1366 brelse(indbh);
1367 return error;
1368}
1369
1370static int ea_dealloc_block(struct gfs2_inode *ip)
1371{
1372 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1373 struct gfs2_rgrpd *rgd;
1374 struct buffer_head *dibh;
1375 struct gfs2_holder gh;
1376 int error;
1377
1378 error = gfs2_rindex_update(sdp);
1379 if (error)
1380 return error;
1381
1382 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1383 if (!rgd) {
1384 gfs2_consist_inode(ip);
1385 return -EIO;
1386 }
1387
1388 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1389 if (error)
1390 return error;
1391
1392 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1393 RES_QUOTA, 1);
1394 if (error)
1395 goto out_gunlock;
1396
1397 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1398
1399 ip->i_eattr = 0;
1400 gfs2_add_inode_blocks(&ip->i_inode, -1);
1401
1402 error = gfs2_meta_inode_buffer(ip, &dibh);
1403 if (!error) {
1404 gfs2_trans_add_meta(ip->i_gl, dibh);
1405 gfs2_dinode_out(ip, dibh->b_data);
1406 brelse(dibh);
1407 }
1408
1409 gfs2_trans_end(sdp);
1410
1411out_gunlock:
1412 gfs2_glock_dq_uninit(&gh);
1413 return error;
1414}
1415
1416
1417
1418
1419
1420
1421
1422
1423int gfs2_ea_dealloc(struct gfs2_inode *ip)
1424{
1425 int error;
1426
1427 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1428 if (error)
1429 return error;
1430
1431 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1432 if (error)
1433 return error;
1434
1435 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1436 if (error)
1437 goto out_quota;
1438
1439 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1440 error = ea_dealloc_indirect(ip);
1441 if (error)
1442 goto out_quota;
1443 }
1444
1445 error = ea_dealloc_block(ip);
1446
1447out_quota:
1448 gfs2_quota_unhold(ip);
1449 return error;
1450}
1451
1452static const struct xattr_handler gfs2_xattr_user_handler = {
1453 .prefix = XATTR_USER_PREFIX,
1454 .flags = GFS2_EATYPE_USR,
1455 .get = gfs2_xattr_get,
1456 .set = gfs2_xattr_set,
1457};
1458
1459static const struct xattr_handler gfs2_xattr_security_handler = {
1460 .prefix = XATTR_SECURITY_PREFIX,
1461 .flags = GFS2_EATYPE_SECURITY,
1462 .get = gfs2_xattr_get,
1463 .set = gfs2_xattr_set,
1464};
1465
1466const struct xattr_handler *gfs2_xattr_handlers[] = {
1467 &gfs2_xattr_user_handler,
1468 &gfs2_xattr_security_handler,
1469 &posix_acl_access_xattr_handler,
1470 &posix_acl_default_xattr_handler,
1471 NULL,
1472};
1473
1474
