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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 <linux/posix_acl_xattr.h>
17#include <asm/uaccess.h>
18
19#include "gfs2.h"
20#include "incore.h"
21#include "acl.h"
22#include "xattr.h"
23#include "glock.h"
24#include "inode.h"
25#include "meta_io.h"
26#include "quota.h"
27#include "rgrp.h"
28#include "trans.h"
29#include "util.h"
30
31
32
33
34
35
36
37
38
39
40
41static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
42 unsigned int *size)
43{
44 unsigned int jbsize = sdp->sd_jbsize;
45
46
47 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
48
49 if (*size <= jbsize)
50 return 1;
51
52
53 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
54 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
55
56 return 0;
57}
58
59static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
60{
61 unsigned int size;
62
63 if (dsize > GFS2_EA_MAX_DATA_LEN)
64 return -ERANGE;
65
66 ea_calc_size(sdp, nsize, dsize, &size);
67
68
69 if (size > sdp->sd_jbsize)
70 return -ERANGE;
71
72 return 0;
73}
74
75typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
76 struct gfs2_ea_header *ea,
77 struct gfs2_ea_header *prev, void *private);
78
79static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
80 ea_call_t ea_call, void *data)
81{
82 struct gfs2_ea_header *ea, *prev = NULL;
83 int error = 0;
84
85 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
86 return -EIO;
87
88 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
89 if (!GFS2_EA_REC_LEN(ea))
90 goto fail;
91 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
92 bh->b_data + bh->b_size))
93 goto fail;
94 if (!GFS2_EATYPE_VALID(ea->ea_type))
95 goto fail;
96
97 error = ea_call(ip, bh, ea, prev, data);
98 if (error)
99 return error;
100
101 if (GFS2_EA_IS_LAST(ea)) {
102 if ((char *)GFS2_EA2NEXT(ea) !=
103 bh->b_data + bh->b_size)
104 goto fail;
105 break;
106 }
107 }
108
109 return error;
110
111fail:
112 gfs2_consist_inode(ip);
113 return -EIO;
114}
115
116static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
117{
118 struct buffer_head *bh, *eabh;
119 __be64 *eablk, *end;
120 int error;
121
122 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
123 if (error)
124 return error;
125
126 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
127 error = ea_foreach_i(ip, bh, ea_call, data);
128 goto out;
129 }
130
131 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
132 error = -EIO;
133 goto out;
134 }
135
136 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
137 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
138
139 for (; eablk < end; eablk++) {
140 u64 bn;
141
142 if (!*eablk)
143 break;
144 bn = be64_to_cpu(*eablk);
145
146 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
147 if (error)
148 break;
149 error = ea_foreach_i(ip, eabh, ea_call, data);
150 brelse(eabh);
151 if (error)
152 break;
153 }
154out:
155 brelse(bh);
156 return error;
157}
158
159struct ea_find {
160 int type;
161 const char *name;
162 size_t namel;
163 struct gfs2_ea_location *ef_el;
164};
165
166static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
167 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
168 void *private)
169{
170 struct ea_find *ef = private;
171
172 if (ea->ea_type == GFS2_EATYPE_UNUSED)
173 return 0;
174
175 if (ea->ea_type == ef->type) {
176 if (ea->ea_name_len == ef->namel &&
177 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
178 struct gfs2_ea_location *el = ef->ef_el;
179 get_bh(bh);
180 el->el_bh = bh;
181 el->el_ea = ea;
182 el->el_prev = prev;
183 return 1;
184 }
185 }
186
187 return 0;
188}
189
190static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
191 struct gfs2_ea_location *el)
192{
193 struct ea_find ef;
194 int error;
195
196 ef.type = type;
197 ef.name = name;
198 ef.namel = strlen(name);
199 ef.ef_el = el;
200
201 memset(el, 0, sizeof(struct gfs2_ea_location));
202
203 error = ea_foreach(ip, ea_find_i, &ef);
204 if (error > 0)
205 return 0;
206
207 return error;
208}
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
226 struct gfs2_ea_header *ea,
227 struct gfs2_ea_header *prev, void *private)
228{
229 int *leave = private;
230 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
231 struct gfs2_rgrpd *rgd;
232 struct gfs2_holder rg_gh;
233 struct buffer_head *dibh;
234 __be64 *dataptrs;
235 u64 bn = 0;
236 u64 bstart = 0;
237 unsigned int blen = 0;
238 unsigned int blks = 0;
239 unsigned int x;
240 int error;
241
242 error = gfs2_rindex_update(sdp);
243 if (error)
244 return error;
245
246 if (GFS2_EA_IS_STUFFED(ea))
247 return 0;
248
249 dataptrs = GFS2_EA2DATAPTRS(ea);
250 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
251 if (*dataptrs) {
252 blks++;
253 bn = be64_to_cpu(*dataptrs);
254 }
255 }
256 if (!blks)
257 return 0;
258
259 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
260 if (!rgd) {
261 gfs2_consist_inode(ip);
262 return -EIO;
263 }
264
265 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
266 if (error)
267 return error;
268
269 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
270 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
271 if (error)
272 goto out_gunlock;
273
274 gfs2_trans_add_meta(ip->i_gl, bh);
275
276 dataptrs = GFS2_EA2DATAPTRS(ea);
277 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
278 if (!*dataptrs)
279 break;
280 bn = be64_to_cpu(*dataptrs);
281
282 if (bstart + blen == bn)
283 blen++;
284 else {
285 if (bstart)
286 gfs2_free_meta(ip, bstart, blen);
287 bstart = bn;
288 blen = 1;
289 }
290
291 *dataptrs = 0;
292 gfs2_add_inode_blocks(&ip->i_inode, -1);
293 }
294 if (bstart)
295 gfs2_free_meta(ip, bstart, blen);
296
297 if (prev && !leave) {
298 u32 len;
299
300 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
301 prev->ea_rec_len = cpu_to_be32(len);
302
303 if (GFS2_EA_IS_LAST(ea))
304 prev->ea_flags |= GFS2_EAFLAG_LAST;
305 } else {
306 ea->ea_type = GFS2_EATYPE_UNUSED;
307 ea->ea_num_ptrs = 0;
308 }
309
310 error = gfs2_meta_inode_buffer(ip, &dibh);
311 if (!error) {
312 ip->i_inode.i_ctime = CURRENT_TIME;
313 gfs2_trans_add_meta(ip->i_gl, dibh);
314 gfs2_dinode_out(ip, dibh->b_data);
315 brelse(dibh);
316 }
317
318 gfs2_trans_end(sdp);
319
320out_gunlock:
321 gfs2_glock_dq_uninit(&rg_gh);
322 return error;
323}
324
325static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
326 struct gfs2_ea_header *ea,
327 struct gfs2_ea_header *prev, int leave)
328{
329 int error;
330
331 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
332 if (error)
333 return error;
334
335 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
336 if (error)
337 goto out_alloc;
338
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340
341 gfs2_quota_unhold(ip);
342out_alloc:
343 return error;
344}
345
346struct ea_list {
347 struct gfs2_ea_request *ei_er;
348 unsigned int ei_size;
349};
350
351static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
352{
353 switch (ea->ea_type) {
354 case GFS2_EATYPE_USR:
355 return 5 + ea->ea_name_len + 1;
356 case GFS2_EATYPE_SYS:
357 return 7 + ea->ea_name_len + 1;
358 case GFS2_EATYPE_SECURITY:
359 return 9 + ea->ea_name_len + 1;
360 default:
361 return 0;
362 }
363}
364
365static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
366 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
367 void *private)
368{
369 struct ea_list *ei = private;
370 struct gfs2_ea_request *er = ei->ei_er;
371 unsigned int ea_size = gfs2_ea_strlen(ea);
372
373 if (ea->ea_type == GFS2_EATYPE_UNUSED)
374 return 0;
375
376 if (er->er_data_len) {
377 char *prefix = NULL;
378 unsigned int l = 0;
379 char c = 0;
380
381 if (ei->ei_size + ea_size > er->er_data_len)
382 return -ERANGE;
383
384 switch (ea->ea_type) {
385 case GFS2_EATYPE_USR:
386 prefix = "user.";
387 l = 5;
388 break;
389 case GFS2_EATYPE_SYS:
390 prefix = "system.";
391 l = 7;
392 break;
393 case GFS2_EATYPE_SECURITY:
394 prefix = "security.";
395 l = 9;
396 break;
397 }
398
399 BUG_ON(l == 0);
400
401 memcpy(er->er_data + ei->ei_size, prefix, l);
402 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
403 ea->ea_name_len);
404 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
405 }
406
407 ei->ei_size += ea_size;
408
409 return 0;
410}
411
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417
418
419
420
421ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
422{
423 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
424 struct gfs2_ea_request er;
425 struct gfs2_holder i_gh;
426 int error;
427
428 memset(&er, 0, sizeof(struct gfs2_ea_request));
429 if (size) {
430 er.er_data = buffer;
431 er.er_data_len = size;
432 }
433
434 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
435 if (error)
436 return error;
437
438 if (ip->i_eattr) {
439 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
440
441 error = ea_foreach(ip, ea_list_i, &ei);
442 if (!error)
443 error = ei.ei_size;
444 }
445
446 gfs2_glock_dq_uninit(&i_gh);
447
448 return error;
449}
450
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452
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455
456
457
458
459
460
461
462static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
463 const char *din, char *dout)
464{
465 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
466 struct buffer_head **bh;
467 unsigned int amount = GFS2_EA_DATA_LEN(ea);
468 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
469 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
470 unsigned int x;
471 int error = 0;
472 unsigned char *pos;
473 unsigned cp_size;
474
475 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
476 if (!bh)
477 return -ENOMEM;
478
479 for (x = 0; x < nptrs; x++) {
480 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
481 bh + x);
482 if (error) {
483 while (x--)
484 brelse(bh[x]);
485 goto out;
486 }
487 dataptrs++;
488 }
489
490 for (x = 0; x < nptrs; x++) {
491 error = gfs2_meta_wait(sdp, bh[x]);
492 if (error) {
493 for (; x < nptrs; x++)
494 brelse(bh[x]);
495 goto out;
496 }
497 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
498 for (; x < nptrs; x++)
499 brelse(bh[x]);
500 error = -EIO;
501 goto out;
502 }
503
504 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
505 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
506
507 if (dout) {
508 memcpy(dout, pos, cp_size);
509 dout += sdp->sd_jbsize;
510 }
511
512 if (din) {
513 gfs2_trans_add_meta(ip->i_gl, bh[x]);
514 memcpy(pos, din, cp_size);
515 din += sdp->sd_jbsize;
516 }
517
518 amount -= sdp->sd_jbsize;
519 brelse(bh[x]);
520 }
521
522out:
523 kfree(bh);
524 return error;
525}
526
527static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
528 char *data, size_t size)
529{
530 int ret;
531 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
532 if (len > size)
533 return -ERANGE;
534
535 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
536 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
537 return len;
538 }
539 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
540 if (ret < 0)
541 return ret;
542 return len;
543}
544
545int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
546{
547 struct gfs2_ea_location el;
548 int error;
549 int len;
550 char *data;
551
552 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
553 if (error)
554 return error;
555 if (!el.el_ea)
556 goto out;
557 if (!GFS2_EA_DATA_LEN(el.el_ea))
558 goto out;
559
560 len = GFS2_EA_DATA_LEN(el.el_ea);
561 data = kmalloc(len, GFP_NOFS);
562 error = -ENOMEM;
563 if (data == NULL)
564 goto out;
565
566 error = gfs2_ea_get_copy(ip, &el, data, len);
567 if (error < 0)
568 kfree(data);
569 else
570 *ppdata = data;
571out:
572 brelse(el.el_bh);
573 return error;
574}
575
576
577
578
579
580
581
582
583
584
585
586static int gfs2_xattr_get(struct dentry *dentry, const char *name,
587 void *buffer, size_t size, int type)
588{
589 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
590 struct gfs2_ea_location el;
591 int error;
592
593 if (!ip->i_eattr)
594 return -ENODATA;
595 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
596 return -EINVAL;
597
598 error = gfs2_ea_find(ip, type, name, &el);
599 if (error)
600 return error;
601 if (!el.el_ea)
602 return -ENODATA;
603 if (size)
604 error = gfs2_ea_get_copy(ip, &el, buffer, size);
605 else
606 error = GFS2_EA_DATA_LEN(el.el_ea);
607 brelse(el.el_bh);
608
609 return error;
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_add_unrevoke(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_add_unrevoke(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 struct buffer_head *dibh;
729 int error;
730
731 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
732 if (error)
733 return error;
734
735 error = gfs2_quota_lock_check(ip, &ap);
736 if (error)
737 return error;
738
739 error = gfs2_inplace_reserve(ip, &ap);
740 if (error)
741 goto out_gunlock_q;
742
743 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
744 blks + gfs2_rg_blocks(ip, blks) +
745 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
746 if (error)
747 goto out_ipres;
748
749 error = skeleton_call(ip, er, private);
750 if (error)
751 goto out_end_trans;
752
753 error = gfs2_meta_inode_buffer(ip, &dibh);
754 if (!error) {
755 ip->i_inode.i_ctime = CURRENT_TIME;
756 gfs2_trans_add_meta(ip->i_gl, dibh);
757 gfs2_dinode_out(ip, dibh->b_data);
758 brelse(dibh);
759 }
760
761out_end_trans:
762 gfs2_trans_end(GFS2_SB(&ip->i_inode));
763out_ipres:
764 gfs2_inplace_release(ip);
765out_gunlock_q:
766 gfs2_quota_unlock(ip);
767 return error;
768}
769
770static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
771 void *private)
772{
773 struct buffer_head *bh;
774 int error;
775
776 error = ea_alloc_blk(ip, &bh);
777 if (error)
778 return error;
779
780 ip->i_eattr = bh->b_blocknr;
781 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
782
783 brelse(bh);
784
785 return error;
786}
787
788
789
790
791
792
793
794
795
796static int ea_init(struct gfs2_inode *ip, int type, const char *name,
797 const void *data, size_t size)
798{
799 struct gfs2_ea_request er;
800 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
801 unsigned int blks = 1;
802
803 er.er_type = type;
804 er.er_name = name;
805 er.er_name_len = strlen(name);
806 er.er_data = (void *)data;
807 er.er_data_len = size;
808
809 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
810 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
811
812 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
813}
814
815static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
816{
817 u32 ea_size = GFS2_EA_SIZE(ea);
818 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
819 ea_size);
820 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
821 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
822
823 ea->ea_rec_len = cpu_to_be32(ea_size);
824 ea->ea_flags ^= last;
825
826 new->ea_rec_len = cpu_to_be32(new_size);
827 new->ea_flags = last;
828
829 return new;
830}
831
832static void ea_set_remove_stuffed(struct gfs2_inode *ip,
833 struct gfs2_ea_location *el)
834{
835 struct gfs2_ea_header *ea = el->el_ea;
836 struct gfs2_ea_header *prev = el->el_prev;
837 u32 len;
838
839 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
840
841 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
842 ea->ea_type = GFS2_EATYPE_UNUSED;
843 return;
844 } else if (GFS2_EA2NEXT(prev) != ea) {
845 prev = GFS2_EA2NEXT(prev);
846 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
847 }
848
849 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
850 prev->ea_rec_len = cpu_to_be32(len);
851
852 if (GFS2_EA_IS_LAST(ea))
853 prev->ea_flags |= GFS2_EAFLAG_LAST;
854}
855
856struct ea_set {
857 int ea_split;
858
859 struct gfs2_ea_request *es_er;
860 struct gfs2_ea_location *es_el;
861
862 struct buffer_head *es_bh;
863 struct gfs2_ea_header *es_ea;
864};
865
866static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
867 struct gfs2_ea_header *ea, struct ea_set *es)
868{
869 struct gfs2_ea_request *er = es->es_er;
870 struct buffer_head *dibh;
871 int error;
872
873 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
874 if (error)
875 return error;
876
877 gfs2_trans_add_meta(ip->i_gl, bh);
878
879 if (es->ea_split)
880 ea = ea_split_ea(ea);
881
882 ea_write(ip, ea, er);
883
884 if (es->es_el)
885 ea_set_remove_stuffed(ip, es->es_el);
886
887 error = gfs2_meta_inode_buffer(ip, &dibh);
888 if (error)
889 goto out;
890 ip->i_inode.i_ctime = CURRENT_TIME;
891 gfs2_trans_add_meta(ip->i_gl, dibh);
892 gfs2_dinode_out(ip, dibh->b_data);
893 brelse(dibh);
894out:
895 gfs2_trans_end(GFS2_SB(&ip->i_inode));
896 return error;
897}
898
899static int ea_set_simple_alloc(struct gfs2_inode *ip,
900 struct gfs2_ea_request *er, void *private)
901{
902 struct ea_set *es = private;
903 struct gfs2_ea_header *ea = es->es_ea;
904 int error;
905
906 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
907
908 if (es->ea_split)
909 ea = ea_split_ea(ea);
910
911 error = ea_write(ip, ea, er);
912 if (error)
913 return error;
914
915 if (es->es_el)
916 ea_set_remove_stuffed(ip, es->es_el);
917
918 return 0;
919}
920
921static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
922 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
923 void *private)
924{
925 struct ea_set *es = private;
926 unsigned int size;
927 int stuffed;
928 int error;
929
930 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
931 es->es_er->er_data_len, &size);
932
933 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
934 if (GFS2_EA_REC_LEN(ea) < size)
935 return 0;
936 if (!GFS2_EA_IS_STUFFED(ea)) {
937 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
938 if (error)
939 return error;
940 }
941 es->ea_split = 0;
942 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
943 es->ea_split = 1;
944 else
945 return 0;
946
947 if (stuffed) {
948 error = ea_set_simple_noalloc(ip, bh, ea, es);
949 if (error)
950 return error;
951 } else {
952 unsigned int blks;
953
954 es->es_bh = bh;
955 es->es_ea = ea;
956 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
957 GFS2_SB(&ip->i_inode)->sd_jbsize);
958
959 error = ea_alloc_skeleton(ip, es->es_er, blks,
960 ea_set_simple_alloc, es);
961 if (error)
962 return error;
963 }
964
965 return 1;
966}
967
968static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
969 void *private)
970{
971 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
972 struct buffer_head *indbh, *newbh;
973 __be64 *eablk;
974 int error;
975 int mh_size = sizeof(struct gfs2_meta_header);
976
977 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
978 __be64 *end;
979
980 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
981 &indbh);
982 if (error)
983 return error;
984
985 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
986 error = -EIO;
987 goto out;
988 }
989
990 eablk = (__be64 *)(indbh->b_data + mh_size);
991 end = eablk + sdp->sd_inptrs;
992
993 for (; eablk < end; eablk++)
994 if (!*eablk)
995 break;
996
997 if (eablk == end) {
998 error = -ENOSPC;
999 goto out;
1000 }
1001
1002 gfs2_trans_add_meta(ip->i_gl, indbh);
1003 } else {
1004 u64 blk;
1005 unsigned int n = 1;
1006 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1007 if (error)
1008 return error;
1009 gfs2_trans_add_unrevoke(sdp, blk, 1);
1010 indbh = gfs2_meta_new(ip->i_gl, blk);
1011 gfs2_trans_add_meta(ip->i_gl, indbh);
1012 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1013 gfs2_buffer_clear_tail(indbh, mh_size);
1014
1015 eablk = (__be64 *)(indbh->b_data + mh_size);
1016 *eablk = cpu_to_be64(ip->i_eattr);
1017 ip->i_eattr = blk;
1018 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1019 gfs2_add_inode_blocks(&ip->i_inode, 1);
1020
1021 eablk++;
1022 }
1023
1024 error = ea_alloc_blk(ip, &newbh);
1025 if (error)
1026 goto out;
1027
1028 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1029 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1030 brelse(newbh);
1031 if (error)
1032 goto out;
1033
1034 if (private)
1035 ea_set_remove_stuffed(ip, private);
1036
1037out:
1038 brelse(indbh);
1039 return error;
1040}
1041
1042static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1043 const void *value, size_t size, struct gfs2_ea_location *el)
1044{
1045 struct gfs2_ea_request er;
1046 struct ea_set es;
1047 unsigned int blks = 2;
1048 int error;
1049
1050 er.er_type = type;
1051 er.er_name = name;
1052 er.er_data = (void *)value;
1053 er.er_name_len = strlen(name);
1054 er.er_data_len = size;
1055
1056 memset(&es, 0, sizeof(struct ea_set));
1057 es.es_er = &er;
1058 es.es_el = el;
1059
1060 error = ea_foreach(ip, ea_set_simple, &es);
1061 if (error > 0)
1062 return 0;
1063 if (error)
1064 return error;
1065
1066 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1067 blks++;
1068 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1069 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1070
1071 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1072}
1073
1074static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1075 struct gfs2_ea_location *el)
1076{
1077 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1078 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1079 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1080 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1081 }
1082
1083 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1084}
1085
1086static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1087{
1088 struct gfs2_ea_header *ea = el->el_ea;
1089 struct gfs2_ea_header *prev = el->el_prev;
1090 struct buffer_head *dibh;
1091 int error;
1092
1093 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1094 if (error)
1095 return error;
1096
1097 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1098
1099 if (prev) {
1100 u32 len;
1101
1102 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1103 prev->ea_rec_len = cpu_to_be32(len);
1104
1105 if (GFS2_EA_IS_LAST(ea))
1106 prev->ea_flags |= GFS2_EAFLAG_LAST;
1107 } else {
1108 ea->ea_type = GFS2_EATYPE_UNUSED;
1109 }
1110
1111 error = gfs2_meta_inode_buffer(ip, &dibh);
1112 if (!error) {
1113 ip->i_inode.i_ctime = CURRENT_TIME;
1114 gfs2_trans_add_meta(ip->i_gl, dibh);
1115 gfs2_dinode_out(ip, dibh->b_data);
1116 brelse(dibh);
1117 }
1118
1119 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1120
1121 return error;
1122}
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1138{
1139 struct gfs2_ea_location el;
1140 int error;
1141
1142 if (!ip->i_eattr)
1143 return -ENODATA;
1144
1145 error = gfs2_ea_find(ip, type, name, &el);
1146 if (error)
1147 return error;
1148 if (!el.el_ea)
1149 return -ENODATA;
1150
1151 if (GFS2_EA_IS_STUFFED(el.el_ea))
1152 error = ea_remove_stuffed(ip, &el);
1153 else
1154 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1155
1156 brelse(el.el_bh);
1157
1158 return error;
1159}
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175int __gfs2_xattr_set(struct inode *inode, const char *name,
1176 const void *value, size_t size, int flags, int type)
1177{
1178 struct gfs2_inode *ip = GFS2_I(inode);
1179 struct gfs2_sbd *sdp = GFS2_SB(inode);
1180 struct gfs2_ea_location el;
1181 unsigned int namel = strlen(name);
1182 int error;
1183
1184 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1185 return -EPERM;
1186 if (namel > GFS2_EA_MAX_NAME_LEN)
1187 return -ERANGE;
1188
1189 if (value == NULL)
1190 return gfs2_xattr_remove(ip, type, name);
1191
1192 if (ea_check_size(sdp, namel, size))
1193 return -ERANGE;
1194
1195 if (!ip->i_eattr) {
1196 if (flags & XATTR_REPLACE)
1197 return -ENODATA;
1198 return ea_init(ip, type, name, value, size);
1199 }
1200
1201 error = gfs2_ea_find(ip, type, name, &el);
1202 if (error)
1203 return error;
1204
1205 if (el.el_ea) {
1206 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1207 brelse(el.el_bh);
1208 return -EPERM;
1209 }
1210
1211 error = -EEXIST;
1212 if (!(flags & XATTR_CREATE)) {
1213 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1214 error = ea_set_i(ip, type, name, value, size, &el);
1215 if (!error && unstuffed)
1216 ea_set_remove_unstuffed(ip, &el);
1217 }
1218
1219 brelse(el.el_bh);
1220 return error;
1221 }
1222
1223 error = -ENODATA;
1224 if (!(flags & XATTR_REPLACE))
1225 error = ea_set_i(ip, type, name, value, size, NULL);
1226
1227 return error;
1228}
1229
1230static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1231 const void *value, size_t size, int flags, int type)
1232{
1233 return __gfs2_xattr_set(d_inode(dentry), name, value,
1234 size, flags, type);
1235}
1236
1237
1238static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1239 struct gfs2_ea_header *ea, char *data)
1240{
1241 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1242 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1243 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1244 int ret;
1245
1246 ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1247 if (ret)
1248 return ret;
1249
1250 ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1251 gfs2_trans_end(sdp);
1252
1253 return ret;
1254}
1255
1256int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1257{
1258 struct inode *inode = &ip->i_inode;
1259 struct gfs2_sbd *sdp = GFS2_SB(inode);
1260 struct gfs2_ea_location el;
1261 int error;
1262
1263 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1264 if (error)
1265 return error;
1266
1267 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1268 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1269 if (error == 0) {
1270 gfs2_trans_add_meta(ip->i_gl, el.el_bh);
1271 memcpy(GFS2_EA2DATA(el.el_ea), data,
1272 GFS2_EA_DATA_LEN(el.el_ea));
1273 }
1274 } else {
1275 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1276 }
1277
1278 brelse(el.el_bh);
1279 if (error)
1280 return error;
1281
1282 error = gfs2_setattr_simple(inode, attr);
1283 gfs2_trans_end(sdp);
1284 return error;
1285}
1286
1287static int ea_dealloc_indirect(struct gfs2_inode *ip)
1288{
1289 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1290 struct gfs2_rgrp_list rlist;
1291 struct buffer_head *indbh, *dibh;
1292 __be64 *eablk, *end;
1293 unsigned int rg_blocks = 0;
1294 u64 bstart = 0;
1295 unsigned int blen = 0;
1296 unsigned int blks = 0;
1297 unsigned int x;
1298 int error;
1299
1300 error = gfs2_rindex_update(sdp);
1301 if (error)
1302 return error;
1303
1304 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1305
1306 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1307 if (error)
1308 return error;
1309
1310 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1311 error = -EIO;
1312 goto out;
1313 }
1314
1315 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1316 end = eablk + sdp->sd_inptrs;
1317
1318 for (; eablk < end; eablk++) {
1319 u64 bn;
1320
1321 if (!*eablk)
1322 break;
1323 bn = be64_to_cpu(*eablk);
1324
1325 if (bstart + blen == bn)
1326 blen++;
1327 else {
1328 if (bstart)
1329 gfs2_rlist_add(ip, &rlist, bstart);
1330 bstart = bn;
1331 blen = 1;
1332 }
1333 blks++;
1334 }
1335 if (bstart)
1336 gfs2_rlist_add(ip, &rlist, bstart);
1337 else
1338 goto out;
1339
1340 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1341
1342 for (x = 0; x < rlist.rl_rgrps; x++) {
1343 struct gfs2_rgrpd *rgd;
1344 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1345 rg_blocks += rgd->rd_length;
1346 }
1347
1348 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1349 if (error)
1350 goto out_rlist_free;
1351
1352 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1353 RES_STATFS + RES_QUOTA, blks);
1354 if (error)
1355 goto out_gunlock;
1356
1357 gfs2_trans_add_meta(ip->i_gl, indbh);
1358
1359 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1360 bstart = 0;
1361 blen = 0;
1362
1363 for (; eablk < end; eablk++) {
1364 u64 bn;
1365
1366 if (!*eablk)
1367 break;
1368 bn = be64_to_cpu(*eablk);
1369
1370 if (bstart + blen == bn)
1371 blen++;
1372 else {
1373 if (bstart)
1374 gfs2_free_meta(ip, bstart, blen);
1375 bstart = bn;
1376 blen = 1;
1377 }
1378
1379 *eablk = 0;
1380 gfs2_add_inode_blocks(&ip->i_inode, -1);
1381 }
1382 if (bstart)
1383 gfs2_free_meta(ip, bstart, blen);
1384
1385 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1386
1387 error = gfs2_meta_inode_buffer(ip, &dibh);
1388 if (!error) {
1389 gfs2_trans_add_meta(ip->i_gl, dibh);
1390 gfs2_dinode_out(ip, dibh->b_data);
1391 brelse(dibh);
1392 }
1393
1394 gfs2_trans_end(sdp);
1395
1396out_gunlock:
1397 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1398out_rlist_free:
1399 gfs2_rlist_free(&rlist);
1400out:
1401 brelse(indbh);
1402 return error;
1403}
1404
1405static int ea_dealloc_block(struct gfs2_inode *ip)
1406{
1407 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1408 struct gfs2_rgrpd *rgd;
1409 struct buffer_head *dibh;
1410 struct gfs2_holder gh;
1411 int error;
1412
1413 error = gfs2_rindex_update(sdp);
1414 if (error)
1415 return error;
1416
1417 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1418 if (!rgd) {
1419 gfs2_consist_inode(ip);
1420 return -EIO;
1421 }
1422
1423 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1424 if (error)
1425 return error;
1426
1427 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1428 RES_QUOTA, 1);
1429 if (error)
1430 goto out_gunlock;
1431
1432 gfs2_free_meta(ip, ip->i_eattr, 1);
1433
1434 ip->i_eattr = 0;
1435 gfs2_add_inode_blocks(&ip->i_inode, -1);
1436
1437 error = gfs2_meta_inode_buffer(ip, &dibh);
1438 if (!error) {
1439 gfs2_trans_add_meta(ip->i_gl, dibh);
1440 gfs2_dinode_out(ip, dibh->b_data);
1441 brelse(dibh);
1442 }
1443
1444 gfs2_trans_end(sdp);
1445
1446out_gunlock:
1447 gfs2_glock_dq_uninit(&gh);
1448 return error;
1449}
1450
1451
1452
1453
1454
1455
1456
1457
1458int gfs2_ea_dealloc(struct gfs2_inode *ip)
1459{
1460 int error;
1461
1462 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1463 if (error)
1464 return error;
1465
1466 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1467 if (error)
1468 return error;
1469
1470 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1471 if (error)
1472 goto out_quota;
1473
1474 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1475 error = ea_dealloc_indirect(ip);
1476 if (error)
1477 goto out_quota;
1478 }
1479
1480 error = ea_dealloc_block(ip);
1481
1482out_quota:
1483 gfs2_quota_unhold(ip);
1484 return error;
1485}
1486
1487static const struct xattr_handler gfs2_xattr_user_handler = {
1488 .prefix = XATTR_USER_PREFIX,
1489 .flags = GFS2_EATYPE_USR,
1490 .get = gfs2_xattr_get,
1491 .set = gfs2_xattr_set,
1492};
1493
1494static const struct xattr_handler gfs2_xattr_security_handler = {
1495 .prefix = XATTR_SECURITY_PREFIX,
1496 .flags = GFS2_EATYPE_SECURITY,
1497 .get = gfs2_xattr_get,
1498 .set = gfs2_xattr_set,
1499};
1500
1501const struct xattr_handler *gfs2_xattr_handlers[] = {
1502 &gfs2_xattr_user_handler,
1503 &gfs2_xattr_security_handler,
1504 &posix_acl_access_xattr_handler,
1505 &posix_acl_default_xattr_handler,
1506 NULL,
1507};
1508
1509
