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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 <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_qadata *qa;
325 int error;
326
327 qa = gfs2_qadata_get(ip);
328 if (!qa)
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_qadata_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
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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
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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 kfree(data);
554 else
555 *ppdata = data;
556out:
557 brelse(el.el_bh);
558 return error;
559}
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562
563
564
565
566
567
568
569
570
571static int gfs2_xattr_get(struct dentry *dentry, const char *name,
572 void *buffer, size_t size, int type)
573{
574 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
575 struct gfs2_ea_location el;
576 int error;
577
578 if (!ip->i_eattr)
579 return -ENODATA;
580 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
581 return -EINVAL;
582
583 error = gfs2_ea_find(ip, type, name, &el);
584 if (error)
585 return error;
586 if (!el.el_ea)
587 return -ENODATA;
588 if (size)
589 error = gfs2_ea_get_copy(ip, &el, buffer, size);
590 else
591 error = GFS2_EA_DATA_LEN(el.el_ea);
592 brelse(el.el_bh);
593
594 return error;
595}
596
597
598
599
600
601
602
603
604
605static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
606{
607 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
608 struct gfs2_ea_header *ea;
609 unsigned int n = 1;
610 u64 block;
611 int error;
612
613 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
614 if (error)
615 return error;
616 gfs2_trans_add_unrevoke(sdp, block, 1);
617 *bhp = gfs2_meta_new(ip->i_gl, block);
618 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
619 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
620 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
621
622 ea = GFS2_EA_BH2FIRST(*bhp);
623 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
624 ea->ea_type = GFS2_EATYPE_UNUSED;
625 ea->ea_flags = GFS2_EAFLAG_LAST;
626 ea->ea_num_ptrs = 0;
627
628 gfs2_add_inode_blocks(&ip->i_inode, 1);
629
630 return 0;
631}
632
633
634
635
636
637
638
639
640
641
642
643
644
645static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
646 struct gfs2_ea_request *er)
647{
648 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
649 int error;
650
651 ea->ea_data_len = cpu_to_be32(er->er_data_len);
652 ea->ea_name_len = er->er_name_len;
653 ea->ea_type = er->er_type;
654 ea->__pad = 0;
655
656 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
657
658 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
659 ea->ea_num_ptrs = 0;
660 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
661 } else {
662 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
663 const char *data = er->er_data;
664 unsigned int data_len = er->er_data_len;
665 unsigned int copy;
666 unsigned int x;
667
668 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
669 for (x = 0; x < ea->ea_num_ptrs; x++) {
670 struct buffer_head *bh;
671 u64 block;
672 int mh_size = sizeof(struct gfs2_meta_header);
673 unsigned int n = 1;
674
675 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
676 if (error)
677 return error;
678 gfs2_trans_add_unrevoke(sdp, block, 1);
679 bh = gfs2_meta_new(ip->i_gl, block);
680 gfs2_trans_add_bh(ip->i_gl, bh, 1);
681 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
682
683 gfs2_add_inode_blocks(&ip->i_inode, 1);
684
685 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
686 data_len;
687 memcpy(bh->b_data + mh_size, data, copy);
688 if (copy < sdp->sd_jbsize)
689 memset(bh->b_data + mh_size + copy, 0,
690 sdp->sd_jbsize - copy);
691
692 *dataptr++ = cpu_to_be64(bh->b_blocknr);
693 data += copy;
694 data_len -= copy;
695
696 brelse(bh);
697 }
698
699 gfs2_assert_withdraw(sdp, !data_len);
700 }
701
702 return 0;
703}
704
705typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
706 struct gfs2_ea_request *er, void *private);
707
708static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
709 unsigned int blks,
710 ea_skeleton_call_t skeleton_call, void *private)
711{
712 struct gfs2_qadata *qa;
713 struct buffer_head *dibh;
714 int error;
715
716 qa = gfs2_qadata_get(ip);
717 if (!qa)
718 return -ENOMEM;
719
720 error = gfs2_quota_lock_check(ip);
721 if (error)
722 goto out;
723
724 error = gfs2_inplace_reserve(ip, blks);
725 if (error)
726 goto out_gunlock_q;
727
728 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
729 blks + gfs2_rg_blocks(ip) +
730 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
731 if (error)
732 goto out_ipres;
733
734 error = skeleton_call(ip, er, private);
735 if (error)
736 goto out_end_trans;
737
738 error = gfs2_meta_inode_buffer(ip, &dibh);
739 if (!error) {
740 ip->i_inode.i_ctime = CURRENT_TIME;
741 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
742 gfs2_dinode_out(ip, dibh->b_data);
743 brelse(dibh);
744 }
745
746out_end_trans:
747 gfs2_trans_end(GFS2_SB(&ip->i_inode));
748out_ipres:
749 gfs2_inplace_release(ip);
750out_gunlock_q:
751 gfs2_quota_unlock(ip);
752out:
753 gfs2_qadata_put(ip);
754 return error;
755}
756
757static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
758 void *private)
759{
760 struct buffer_head *bh;
761 int error;
762
763 error = ea_alloc_blk(ip, &bh);
764 if (error)
765 return error;
766
767 ip->i_eattr = bh->b_blocknr;
768 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
769
770 brelse(bh);
771
772 return error;
773}
774
775
776
777
778
779
780
781
782
783static int ea_init(struct gfs2_inode *ip, int type, const char *name,
784 const void *data, size_t size)
785{
786 struct gfs2_ea_request er;
787 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
788 unsigned int blks = 1;
789
790 er.er_type = type;
791 er.er_name = name;
792 er.er_name_len = strlen(name);
793 er.er_data = (void *)data;
794 er.er_data_len = size;
795
796 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
797 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
798
799 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
800}
801
802static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
803{
804 u32 ea_size = GFS2_EA_SIZE(ea);
805 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
806 ea_size);
807 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
808 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
809
810 ea->ea_rec_len = cpu_to_be32(ea_size);
811 ea->ea_flags ^= last;
812
813 new->ea_rec_len = cpu_to_be32(new_size);
814 new->ea_flags = last;
815
816 return new;
817}
818
819static void ea_set_remove_stuffed(struct gfs2_inode *ip,
820 struct gfs2_ea_location *el)
821{
822 struct gfs2_ea_header *ea = el->el_ea;
823 struct gfs2_ea_header *prev = el->el_prev;
824 u32 len;
825
826 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
827
828 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
829 ea->ea_type = GFS2_EATYPE_UNUSED;
830 return;
831 } else if (GFS2_EA2NEXT(prev) != ea) {
832 prev = GFS2_EA2NEXT(prev);
833 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
834 }
835
836 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
837 prev->ea_rec_len = cpu_to_be32(len);
838
839 if (GFS2_EA_IS_LAST(ea))
840 prev->ea_flags |= GFS2_EAFLAG_LAST;
841}
842
843struct ea_set {
844 int ea_split;
845
846 struct gfs2_ea_request *es_er;
847 struct gfs2_ea_location *es_el;
848
849 struct buffer_head *es_bh;
850 struct gfs2_ea_header *es_ea;
851};
852
853static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
854 struct gfs2_ea_header *ea, struct ea_set *es)
855{
856 struct gfs2_ea_request *er = es->es_er;
857 struct buffer_head *dibh;
858 int error;
859
860 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
861 if (error)
862 return error;
863
864 gfs2_trans_add_bh(ip->i_gl, bh, 1);
865
866 if (es->ea_split)
867 ea = ea_split_ea(ea);
868
869 ea_write(ip, ea, er);
870
871 if (es->es_el)
872 ea_set_remove_stuffed(ip, es->es_el);
873
874 error = gfs2_meta_inode_buffer(ip, &dibh);
875 if (error)
876 goto out;
877 ip->i_inode.i_ctime = CURRENT_TIME;
878 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
879 gfs2_dinode_out(ip, dibh->b_data);
880 brelse(dibh);
881out:
882 gfs2_trans_end(GFS2_SB(&ip->i_inode));
883 return error;
884}
885
886static int ea_set_simple_alloc(struct gfs2_inode *ip,
887 struct gfs2_ea_request *er, void *private)
888{
889 struct ea_set *es = private;
890 struct gfs2_ea_header *ea = es->es_ea;
891 int error;
892
893 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
894
895 if (es->ea_split)
896 ea = ea_split_ea(ea);
897
898 error = ea_write(ip, ea, er);
899 if (error)
900 return error;
901
902 if (es->es_el)
903 ea_set_remove_stuffed(ip, es->es_el);
904
905 return 0;
906}
907
908static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
909 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
910 void *private)
911{
912 struct ea_set *es = private;
913 unsigned int size;
914 int stuffed;
915 int error;
916
917 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
918 es->es_er->er_data_len, &size);
919
920 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
921 if (GFS2_EA_REC_LEN(ea) < size)
922 return 0;
923 if (!GFS2_EA_IS_STUFFED(ea)) {
924 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
925 if (error)
926 return error;
927 }
928 es->ea_split = 0;
929 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
930 es->ea_split = 1;
931 else
932 return 0;
933
934 if (stuffed) {
935 error = ea_set_simple_noalloc(ip, bh, ea, es);
936 if (error)
937 return error;
938 } else {
939 unsigned int blks;
940
941 es->es_bh = bh;
942 es->es_ea = ea;
943 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
944 GFS2_SB(&ip->i_inode)->sd_jbsize);
945
946 error = ea_alloc_skeleton(ip, es->es_er, blks,
947 ea_set_simple_alloc, es);
948 if (error)
949 return error;
950 }
951
952 return 1;
953}
954
955static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
956 void *private)
957{
958 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
959 struct buffer_head *indbh, *newbh;
960 __be64 *eablk;
961 int error;
962 int mh_size = sizeof(struct gfs2_meta_header);
963
964 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
965 __be64 *end;
966
967 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
968 &indbh);
969 if (error)
970 return error;
971
972 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
973 error = -EIO;
974 goto out;
975 }
976
977 eablk = (__be64 *)(indbh->b_data + mh_size);
978 end = eablk + sdp->sd_inptrs;
979
980 for (; eablk < end; eablk++)
981 if (!*eablk)
982 break;
983
984 if (eablk == end) {
985 error = -ENOSPC;
986 goto out;
987 }
988
989 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
990 } else {
991 u64 blk;
992 unsigned int n = 1;
993 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
994 if (error)
995 return error;
996 gfs2_trans_add_unrevoke(sdp, blk, 1);
997 indbh = gfs2_meta_new(ip->i_gl, blk);
998 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
999 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1000 gfs2_buffer_clear_tail(indbh, mh_size);
1001
1002 eablk = (__be64 *)(indbh->b_data + mh_size);
1003 *eablk = cpu_to_be64(ip->i_eattr);
1004 ip->i_eattr = blk;
1005 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1006 gfs2_add_inode_blocks(&ip->i_inode, 1);
1007
1008 eablk++;
1009 }
1010
1011 error = ea_alloc_blk(ip, &newbh);
1012 if (error)
1013 goto out;
1014
1015 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1016 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1017 brelse(newbh);
1018 if (error)
1019 goto out;
1020
1021 if (private)
1022 ea_set_remove_stuffed(ip, private);
1023
1024out:
1025 brelse(indbh);
1026 return error;
1027}
1028
1029static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1030 const void *value, size_t size, struct gfs2_ea_location *el)
1031{
1032 struct gfs2_ea_request er;
1033 struct ea_set es;
1034 unsigned int blks = 2;
1035 int error;
1036
1037 er.er_type = type;
1038 er.er_name = name;
1039 er.er_data = (void *)value;
1040 er.er_name_len = strlen(name);
1041 er.er_data_len = size;
1042
1043 memset(&es, 0, sizeof(struct ea_set));
1044 es.es_er = &er;
1045 es.es_el = el;
1046
1047 error = ea_foreach(ip, ea_set_simple, &es);
1048 if (error > 0)
1049 return 0;
1050 if (error)
1051 return error;
1052
1053 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1054 blks++;
1055 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1056 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1057
1058 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1059}
1060
1061static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1062 struct gfs2_ea_location *el)
1063{
1064 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1065 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1066 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1067 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1068 }
1069
1070 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1071}
1072
1073static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1074{
1075 struct gfs2_ea_header *ea = el->el_ea;
1076 struct gfs2_ea_header *prev = el->el_prev;
1077 struct buffer_head *dibh;
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_bh(ip->i_gl, el->el_bh, 1);
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 error = gfs2_meta_inode_buffer(ip, &dibh);
1099 if (!error) {
1100 ip->i_inode.i_ctime = CURRENT_TIME;
1101 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1102 gfs2_dinode_out(ip, dibh->b_data);
1103 brelse(dibh);
1104 }
1105
1106 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1107
1108 return error;
1109}
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1125{
1126 struct gfs2_ea_location el;
1127 int error;
1128
1129 if (!ip->i_eattr)
1130 return -ENODATA;
1131
1132 error = gfs2_ea_find(ip, type, name, &el);
1133 if (error)
1134 return error;
1135 if (!el.el_ea)
1136 return -ENODATA;
1137
1138 if (GFS2_EA_IS_STUFFED(el.el_ea))
1139 error = ea_remove_stuffed(ip, &el);
1140 else
1141 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1142
1143 brelse(el.el_bh);
1144
1145 return error;
1146}
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162int __gfs2_xattr_set(struct inode *inode, const char *name,
1163 const void *value, size_t size, int flags, int type)
1164{
1165 struct gfs2_inode *ip = GFS2_I(inode);
1166 struct gfs2_sbd *sdp = GFS2_SB(inode);
1167 struct gfs2_ea_location el;
1168 unsigned int namel = strlen(name);
1169 int error;
1170
1171 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1172 return -EPERM;
1173 if (namel > GFS2_EA_MAX_NAME_LEN)
1174 return -ERANGE;
1175
1176 if (value == NULL)
1177 return gfs2_xattr_remove(ip, type, name);
1178
1179 if (ea_check_size(sdp, namel, size))
1180 return -ERANGE;
1181
1182 if (!ip->i_eattr) {
1183 if (flags & XATTR_REPLACE)
1184 return -ENODATA;
1185 return ea_init(ip, type, name, value, size);
1186 }
1187
1188 error = gfs2_ea_find(ip, type, name, &el);
1189 if (error)
1190 return error;
1191
1192 if (el.el_ea) {
1193 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1194 brelse(el.el_bh);
1195 return -EPERM;
1196 }
1197
1198 error = -EEXIST;
1199 if (!(flags & XATTR_CREATE)) {
1200 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1201 error = ea_set_i(ip, type, name, value, size, &el);
1202 if (!error && unstuffed)
1203 ea_set_remove_unstuffed(ip, &el);
1204 }
1205
1206 brelse(el.el_bh);
1207 return error;
1208 }
1209
1210 error = -ENODATA;
1211 if (!(flags & XATTR_REPLACE))
1212 error = ea_set_i(ip, type, name, value, size, NULL);
1213
1214 return error;
1215}
1216
1217static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1218 const void *value, size_t size, int flags, int type)
1219{
1220 return __gfs2_xattr_set(dentry->d_inode, name, value,
1221 size, flags, type);
1222}
1223
1224static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1225 struct gfs2_ea_header *ea, char *data)
1226{
1227 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1228 struct buffer_head **bh;
1229 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1230 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1231 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1232 unsigned int x;
1233 int error;
1234
1235 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1236 if (!bh)
1237 return -ENOMEM;
1238
1239 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1240 if (error)
1241 goto out;
1242
1243 for (x = 0; x < nptrs; x++) {
1244 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1245 bh + x);
1246 if (error) {
1247 while (x--)
1248 brelse(bh[x]);
1249 goto fail;
1250 }
1251 dataptrs++;
1252 }
1253
1254 for (x = 0; x < nptrs; x++) {
1255 error = gfs2_meta_wait(sdp, bh[x]);
1256 if (error) {
1257 for (; x < nptrs; x++)
1258 brelse(bh[x]);
1259 goto fail;
1260 }
1261 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1262 for (; x < nptrs; x++)
1263 brelse(bh[x]);
1264 error = -EIO;
1265 goto fail;
1266 }
1267
1268 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1269
1270 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1271 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1272
1273 amount -= sdp->sd_jbsize;
1274 data += sdp->sd_jbsize;
1275
1276 brelse(bh[x]);
1277 }
1278
1279out:
1280 kfree(bh);
1281 return error;
1282
1283fail:
1284 gfs2_trans_end(sdp);
1285 kfree(bh);
1286 return error;
1287}
1288
1289int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1290{
1291 struct inode *inode = &ip->i_inode;
1292 struct gfs2_sbd *sdp = GFS2_SB(inode);
1293 struct gfs2_ea_location el;
1294 int error;
1295
1296 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1297 if (error)
1298 return error;
1299
1300 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1301 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1302 if (error == 0) {
1303 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1304 memcpy(GFS2_EA2DATA(el.el_ea), data,
1305 GFS2_EA_DATA_LEN(el.el_ea));
1306 }
1307 } else {
1308 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1309 }
1310
1311 brelse(el.el_bh);
1312 if (error)
1313 return error;
1314
1315 error = gfs2_setattr_simple(inode, attr);
1316 gfs2_trans_end(sdp);
1317 return error;
1318}
1319
1320static int ea_dealloc_indirect(struct gfs2_inode *ip)
1321{
1322 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1323 struct gfs2_rgrp_list rlist;
1324 struct buffer_head *indbh, *dibh;
1325 __be64 *eablk, *end;
1326 unsigned int rg_blocks = 0;
1327 u64 bstart = 0;
1328 unsigned int blen = 0;
1329 unsigned int blks = 0;
1330 unsigned int x;
1331 int error;
1332
1333 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1334
1335 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1336 if (error)
1337 return error;
1338
1339 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1340 error = -EIO;
1341 goto out;
1342 }
1343
1344 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1345 end = eablk + sdp->sd_inptrs;
1346
1347 for (; eablk < end; eablk++) {
1348 u64 bn;
1349
1350 if (!*eablk)
1351 break;
1352 bn = be64_to_cpu(*eablk);
1353
1354 if (bstart + blen == bn)
1355 blen++;
1356 else {
1357 if (bstart)
1358 gfs2_rlist_add(ip, &rlist, bstart);
1359 bstart = bn;
1360 blen = 1;
1361 }
1362 blks++;
1363 }
1364 if (bstart)
1365 gfs2_rlist_add(ip, &rlist, bstart);
1366 else
1367 goto out;
1368
1369 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1370
1371 for (x = 0; x < rlist.rl_rgrps; x++) {
1372 struct gfs2_rgrpd *rgd;
1373 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1374 rg_blocks += rgd->rd_length;
1375 }
1376
1377 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1378 if (error)
1379 goto out_rlist_free;
1380
1381 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1382 RES_STATFS + RES_QUOTA, blks);
1383 if (error)
1384 goto out_gunlock;
1385
1386 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1387
1388 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1389 bstart = 0;
1390 blen = 0;
1391
1392 for (; eablk < end; eablk++) {
1393 u64 bn;
1394
1395 if (!*eablk)
1396 break;
1397 bn = be64_to_cpu(*eablk);
1398
1399 if (bstart + blen == bn)
1400 blen++;
1401 else {
1402 if (bstart)
1403 gfs2_free_meta(ip, bstart, blen);
1404 bstart = bn;
1405 blen = 1;
1406 }
1407
1408 *eablk = 0;
1409 gfs2_add_inode_blocks(&ip->i_inode, -1);
1410 }
1411 if (bstart)
1412 gfs2_free_meta(ip, bstart, blen);
1413
1414 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1415
1416 error = gfs2_meta_inode_buffer(ip, &dibh);
1417 if (!error) {
1418 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1419 gfs2_dinode_out(ip, dibh->b_data);
1420 brelse(dibh);
1421 }
1422
1423 gfs2_trans_end(sdp);
1424
1425out_gunlock:
1426 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1427out_rlist_free:
1428 gfs2_rlist_free(&rlist);
1429out:
1430 brelse(indbh);
1431 return error;
1432}
1433
1434static int ea_dealloc_block(struct gfs2_inode *ip)
1435{
1436 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1437 struct gfs2_rgrpd *rgd;
1438 struct buffer_head *dibh;
1439 struct gfs2_holder gh;
1440 int error;
1441
1442 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1443 if (!rgd) {
1444 gfs2_consist_inode(ip);
1445 return -EIO;
1446 }
1447
1448 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1449 if (error)
1450 return error;
1451
1452 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1453 RES_QUOTA, 1);
1454 if (error)
1455 goto out_gunlock;
1456
1457 gfs2_free_meta(ip, ip->i_eattr, 1);
1458
1459 ip->i_eattr = 0;
1460 gfs2_add_inode_blocks(&ip->i_inode, -1);
1461
1462 error = gfs2_meta_inode_buffer(ip, &dibh);
1463 if (!error) {
1464 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1465 gfs2_dinode_out(ip, dibh->b_data);
1466 brelse(dibh);
1467 }
1468
1469 gfs2_trans_end(sdp);
1470
1471out_gunlock:
1472 gfs2_glock_dq_uninit(&gh);
1473 return error;
1474}
1475
1476
1477
1478
1479
1480
1481
1482
1483int gfs2_ea_dealloc(struct gfs2_inode *ip)
1484{
1485 struct gfs2_qadata *qa;
1486 int error;
1487
1488 qa = gfs2_qadata_get(ip);
1489 if (!qa)
1490 return -ENOMEM;
1491
1492 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1493 if (error)
1494 goto out_alloc;
1495
1496 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1497 if (error)
1498 goto out_quota;
1499
1500 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1501 error = ea_dealloc_indirect(ip);
1502 if (error)
1503 goto out_quota;
1504 }
1505
1506 error = ea_dealloc_block(ip);
1507
1508out_quota:
1509 gfs2_quota_unhold(ip);
1510out_alloc:
1511 gfs2_qadata_put(ip);
1512 return error;
1513}
1514
1515static const struct xattr_handler gfs2_xattr_user_handler = {
1516 .prefix = XATTR_USER_PREFIX,
1517 .flags = GFS2_EATYPE_USR,
1518 .get = gfs2_xattr_get,
1519 .set = gfs2_xattr_set,
1520};
1521
1522static const struct xattr_handler gfs2_xattr_security_handler = {
1523 .prefix = XATTR_SECURITY_PREFIX,
1524 .flags = GFS2_EATYPE_SECURITY,
1525 .get = gfs2_xattr_get,
1526 .set = gfs2_xattr_set,
1527};
1528
1529const struct xattr_handler *gfs2_xattr_handlers[] = {
1530 &gfs2_xattr_user_handler,
1531 &gfs2_xattr_security_handler,
1532 &gfs2_xattr_system_handler,
1533 NULL,
1534};
1535
1536
