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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 error = gfs2_rindex_update(sdp);
242 if (error)
243 return error;
244
245 if (GFS2_EA_IS_STUFFED(ea))
246 return 0;
247
248 dataptrs = GFS2_EA2DATAPTRS(ea);
249 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
250 if (*dataptrs) {
251 blks++;
252 bn = be64_to_cpu(*dataptrs);
253 }
254 }
255 if (!blks)
256 return 0;
257
258 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
259 if (!rgd) {
260 gfs2_consist_inode(ip);
261 return -EIO;
262 }
263
264 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
265 if (error)
266 return error;
267
268 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
269 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
270 if (error)
271 goto out_gunlock;
272
273 gfs2_trans_add_meta(ip->i_gl, bh);
274
275 dataptrs = GFS2_EA2DATAPTRS(ea);
276 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
277 if (!*dataptrs)
278 break;
279 bn = be64_to_cpu(*dataptrs);
280
281 if (bstart + blen == bn)
282 blen++;
283 else {
284 if (bstart)
285 gfs2_free_meta(ip, bstart, blen);
286 bstart = bn;
287 blen = 1;
288 }
289
290 *dataptrs = 0;
291 gfs2_add_inode_blocks(&ip->i_inode, -1);
292 }
293 if (bstart)
294 gfs2_free_meta(ip, bstart, blen);
295
296 if (prev && !leave) {
297 u32 len;
298
299 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
300 prev->ea_rec_len = cpu_to_be32(len);
301
302 if (GFS2_EA_IS_LAST(ea))
303 prev->ea_flags |= GFS2_EAFLAG_LAST;
304 } else {
305 ea->ea_type = GFS2_EATYPE_UNUSED;
306 ea->ea_num_ptrs = 0;
307 }
308
309 error = gfs2_meta_inode_buffer(ip, &dibh);
310 if (!error) {
311 ip->i_inode.i_ctime = CURRENT_TIME;
312 gfs2_trans_add_meta(ip->i_gl, dibh);
313 gfs2_dinode_out(ip, dibh->b_data);
314 brelse(dibh);
315 }
316
317 gfs2_trans_end(sdp);
318
319out_gunlock:
320 gfs2_glock_dq_uninit(&rg_gh);
321 return error;
322}
323
324static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
325 struct gfs2_ea_header *ea,
326 struct gfs2_ea_header *prev, int leave)
327{
328 int error;
329
330 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
331 if (error)
332 return error;
333
334 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
335 if (error)
336 goto out_alloc;
337
338 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
339
340 gfs2_quota_unhold(ip);
341out_alloc:
342 return error;
343}
344
345struct ea_list {
346 struct gfs2_ea_request *ei_er;
347 unsigned int ei_size;
348};
349
350static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
351{
352 switch (ea->ea_type) {
353 case GFS2_EATYPE_USR:
354 return 5 + ea->ea_name_len + 1;
355 case GFS2_EATYPE_SYS:
356 return 7 + ea->ea_name_len + 1;
357 case GFS2_EATYPE_SECURITY:
358 return 9 + ea->ea_name_len + 1;
359 default:
360 return 0;
361 }
362}
363
364static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
365 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
366 void *private)
367{
368 struct ea_list *ei = private;
369 struct gfs2_ea_request *er = ei->ei_er;
370 unsigned int ea_size = gfs2_ea_strlen(ea);
371
372 if (ea->ea_type == GFS2_EATYPE_UNUSED)
373 return 0;
374
375 if (er->er_data_len) {
376 char *prefix = NULL;
377 unsigned int l = 0;
378 char c = 0;
379
380 if (ei->ei_size + ea_size > er->er_data_len)
381 return -ERANGE;
382
383 switch (ea->ea_type) {
384 case GFS2_EATYPE_USR:
385 prefix = "user.";
386 l = 5;
387 break;
388 case GFS2_EATYPE_SYS:
389 prefix = "system.";
390 l = 7;
391 break;
392 case GFS2_EATYPE_SECURITY:
393 prefix = "security.";
394 l = 9;
395 break;
396 }
397
398 BUG_ON(l == 0);
399
400 memcpy(er->er_data + ei->ei_size, prefix, l);
401 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
402 ea->ea_name_len);
403 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
404 }
405
406 ei->ei_size += ea_size;
407
408 return 0;
409}
410
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416
417
418
419
420ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
421{
422 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
423 struct gfs2_ea_request er;
424 struct gfs2_holder i_gh;
425 int error;
426
427 memset(&er, 0, sizeof(struct gfs2_ea_request));
428 if (size) {
429 er.er_data = buffer;
430 er.er_data_len = size;
431 }
432
433 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
434 if (error)
435 return error;
436
437 if (ip->i_eattr) {
438 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
439
440 error = ea_foreach(ip, ea_list_i, &ei);
441 if (!error)
442 error = ei.ei_size;
443 }
444
445 gfs2_glock_dq_uninit(&i_gh);
446
447 return error;
448}
449
450
451
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458
459
460
461static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
462 const char *din, char *dout)
463{
464 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
465 struct buffer_head **bh;
466 unsigned int amount = GFS2_EA_DATA_LEN(ea);
467 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
468 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
469 unsigned int x;
470 int error = 0;
471 unsigned char *pos;
472 unsigned cp_size;
473
474 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
475 if (!bh)
476 return -ENOMEM;
477
478 for (x = 0; x < nptrs; x++) {
479 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
480 bh + x);
481 if (error) {
482 while (x--)
483 brelse(bh[x]);
484 goto out;
485 }
486 dataptrs++;
487 }
488
489 for (x = 0; x < nptrs; x++) {
490 error = gfs2_meta_wait(sdp, bh[x]);
491 if (error) {
492 for (; x < nptrs; x++)
493 brelse(bh[x]);
494 goto out;
495 }
496 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
497 for (; x < nptrs; x++)
498 brelse(bh[x]);
499 error = -EIO;
500 goto out;
501 }
502
503 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
504 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
505
506 if (dout) {
507 memcpy(dout, pos, cp_size);
508 dout += sdp->sd_jbsize;
509 }
510
511 if (din) {
512 gfs2_trans_add_meta(ip->i_gl, bh[x]);
513 memcpy(pos, din, cp_size);
514 din += sdp->sd_jbsize;
515 }
516
517 amount -= sdp->sd_jbsize;
518 brelse(bh[x]);
519 }
520
521out:
522 kfree(bh);
523 return error;
524}
525
526static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
527 char *data, size_t size)
528{
529 int ret;
530 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
531 if (len > size)
532 return -ERANGE;
533
534 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
535 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
536 return len;
537 }
538 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
539 if (ret < 0)
540 return ret;
541 return len;
542}
543
544int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
545{
546 struct gfs2_ea_location el;
547 int error;
548 int len;
549 char *data;
550
551 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
552 if (error)
553 return error;
554 if (!el.el_ea)
555 goto out;
556 if (!GFS2_EA_DATA_LEN(el.el_ea))
557 goto out;
558
559 len = GFS2_EA_DATA_LEN(el.el_ea);
560 data = kmalloc(len, GFP_NOFS);
561 error = -ENOMEM;
562 if (data == NULL)
563 goto out;
564
565 error = gfs2_ea_get_copy(ip, &el, data, len);
566 if (error < 0)
567 kfree(data);
568 else
569 *ppdata = data;
570out:
571 brelse(el.el_bh);
572 return error;
573}
574
575
576
577
578
579
580
581
582
583
584
585static int gfs2_xattr_get(struct dentry *dentry, const char *name,
586 void *buffer, size_t size, int type)
587{
588 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
589 struct gfs2_ea_location el;
590 int error;
591
592 if (!ip->i_eattr)
593 return -ENODATA;
594 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
595 return -EINVAL;
596
597 error = gfs2_ea_find(ip, type, name, &el);
598 if (error)
599 return error;
600 if (!el.el_ea)
601 return -ENODATA;
602 if (size)
603 error = gfs2_ea_get_copy(ip, &el, buffer, size);
604 else
605 error = GFS2_EA_DATA_LEN(el.el_ea);
606 brelse(el.el_bh);
607
608 return error;
609}
610
611
612
613
614
615
616
617
618
619static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
620{
621 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
622 struct gfs2_ea_header *ea;
623 unsigned int n = 1;
624 u64 block;
625 int error;
626
627 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
628 if (error)
629 return error;
630 gfs2_trans_add_unrevoke(sdp, block, 1);
631 *bhp = gfs2_meta_new(ip->i_gl, block);
632 gfs2_trans_add_meta(ip->i_gl, *bhp);
633 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
634 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
635
636 ea = GFS2_EA_BH2FIRST(*bhp);
637 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
638 ea->ea_type = GFS2_EATYPE_UNUSED;
639 ea->ea_flags = GFS2_EAFLAG_LAST;
640 ea->ea_num_ptrs = 0;
641
642 gfs2_add_inode_blocks(&ip->i_inode, 1);
643
644 return 0;
645}
646
647
648
649
650
651
652
653
654
655
656
657
658
659static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
660 struct gfs2_ea_request *er)
661{
662 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
663 int error;
664
665 ea->ea_data_len = cpu_to_be32(er->er_data_len);
666 ea->ea_name_len = er->er_name_len;
667 ea->ea_type = er->er_type;
668 ea->__pad = 0;
669
670 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
671
672 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
673 ea->ea_num_ptrs = 0;
674 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
675 } else {
676 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
677 const char *data = er->er_data;
678 unsigned int data_len = er->er_data_len;
679 unsigned int copy;
680 unsigned int x;
681
682 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
683 for (x = 0; x < ea->ea_num_ptrs; x++) {
684 struct buffer_head *bh;
685 u64 block;
686 int mh_size = sizeof(struct gfs2_meta_header);
687 unsigned int n = 1;
688
689 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
690 if (error)
691 return error;
692 gfs2_trans_add_unrevoke(sdp, block, 1);
693 bh = gfs2_meta_new(ip->i_gl, block);
694 gfs2_trans_add_meta(ip->i_gl, bh);
695 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
696
697 gfs2_add_inode_blocks(&ip->i_inode, 1);
698
699 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
700 data_len;
701 memcpy(bh->b_data + mh_size, data, copy);
702 if (copy < sdp->sd_jbsize)
703 memset(bh->b_data + mh_size + copy, 0,
704 sdp->sd_jbsize - copy);
705
706 *dataptr++ = cpu_to_be64(bh->b_blocknr);
707 data += copy;
708 data_len -= copy;
709
710 brelse(bh);
711 }
712
713 gfs2_assert_withdraw(sdp, !data_len);
714 }
715
716 return 0;
717}
718
719typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
720 struct gfs2_ea_request *er, void *private);
721
722static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
723 unsigned int blks,
724 ea_skeleton_call_t skeleton_call, void *private)
725{
726 struct buffer_head *dibh;
727 int error;
728
729 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
730 if (error)
731 return error;
732
733 error = gfs2_quota_lock_check(ip);
734 if (error)
735 return error;
736
737 error = gfs2_inplace_reserve(ip, blks, 0);
738 if (error)
739 goto out_gunlock_q;
740
741 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
742 blks + gfs2_rg_blocks(ip, blks) +
743 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
744 if (error)
745 goto out_ipres;
746
747 error = skeleton_call(ip, er, private);
748 if (error)
749 goto out_end_trans;
750
751 error = gfs2_meta_inode_buffer(ip, &dibh);
752 if (!error) {
753 ip->i_inode.i_ctime = CURRENT_TIME;
754 gfs2_trans_add_meta(ip->i_gl, dibh);
755 gfs2_dinode_out(ip, dibh->b_data);
756 brelse(dibh);
757 }
758
759out_end_trans:
760 gfs2_trans_end(GFS2_SB(&ip->i_inode));
761out_ipres:
762 gfs2_inplace_release(ip);
763out_gunlock_q:
764 gfs2_quota_unlock(ip);
765 return error;
766}
767
768static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
769 void *private)
770{
771 struct buffer_head *bh;
772 int error;
773
774 error = ea_alloc_blk(ip, &bh);
775 if (error)
776 return error;
777
778 ip->i_eattr = bh->b_blocknr;
779 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
780
781 brelse(bh);
782
783 return error;
784}
785
786
787
788
789
790
791
792
793
794static int ea_init(struct gfs2_inode *ip, int type, const char *name,
795 const void *data, size_t size)
796{
797 struct gfs2_ea_request er;
798 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
799 unsigned int blks = 1;
800
801 er.er_type = type;
802 er.er_name = name;
803 er.er_name_len = strlen(name);
804 er.er_data = (void *)data;
805 er.er_data_len = size;
806
807 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
808 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
809
810 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
811}
812
813static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
814{
815 u32 ea_size = GFS2_EA_SIZE(ea);
816 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
817 ea_size);
818 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
819 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
820
821 ea->ea_rec_len = cpu_to_be32(ea_size);
822 ea->ea_flags ^= last;
823
824 new->ea_rec_len = cpu_to_be32(new_size);
825 new->ea_flags = last;
826
827 return new;
828}
829
830static void ea_set_remove_stuffed(struct gfs2_inode *ip,
831 struct gfs2_ea_location *el)
832{
833 struct gfs2_ea_header *ea = el->el_ea;
834 struct gfs2_ea_header *prev = el->el_prev;
835 u32 len;
836
837 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
838
839 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
840 ea->ea_type = GFS2_EATYPE_UNUSED;
841 return;
842 } else if (GFS2_EA2NEXT(prev) != ea) {
843 prev = GFS2_EA2NEXT(prev);
844 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
845 }
846
847 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
848 prev->ea_rec_len = cpu_to_be32(len);
849
850 if (GFS2_EA_IS_LAST(ea))
851 prev->ea_flags |= GFS2_EAFLAG_LAST;
852}
853
854struct ea_set {
855 int ea_split;
856
857 struct gfs2_ea_request *es_er;
858 struct gfs2_ea_location *es_el;
859
860 struct buffer_head *es_bh;
861 struct gfs2_ea_header *es_ea;
862};
863
864static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
865 struct gfs2_ea_header *ea, struct ea_set *es)
866{
867 struct gfs2_ea_request *er = es->es_er;
868 struct buffer_head *dibh;
869 int error;
870
871 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
872 if (error)
873 return error;
874
875 gfs2_trans_add_meta(ip->i_gl, bh);
876
877 if (es->ea_split)
878 ea = ea_split_ea(ea);
879
880 ea_write(ip, ea, er);
881
882 if (es->es_el)
883 ea_set_remove_stuffed(ip, es->es_el);
884
885 error = gfs2_meta_inode_buffer(ip, &dibh);
886 if (error)
887 goto out;
888 ip->i_inode.i_ctime = CURRENT_TIME;
889 gfs2_trans_add_meta(ip->i_gl, dibh);
890 gfs2_dinode_out(ip, dibh->b_data);
891 brelse(dibh);
892out:
893 gfs2_trans_end(GFS2_SB(&ip->i_inode));
894 return error;
895}
896
897static int ea_set_simple_alloc(struct gfs2_inode *ip,
898 struct gfs2_ea_request *er, void *private)
899{
900 struct ea_set *es = private;
901 struct gfs2_ea_header *ea = es->es_ea;
902 int error;
903
904 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
905
906 if (es->ea_split)
907 ea = ea_split_ea(ea);
908
909 error = ea_write(ip, ea, er);
910 if (error)
911 return error;
912
913 if (es->es_el)
914 ea_set_remove_stuffed(ip, es->es_el);
915
916 return 0;
917}
918
919static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
920 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
921 void *private)
922{
923 struct ea_set *es = private;
924 unsigned int size;
925 int stuffed;
926 int error;
927
928 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
929 es->es_er->er_data_len, &size);
930
931 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
932 if (GFS2_EA_REC_LEN(ea) < size)
933 return 0;
934 if (!GFS2_EA_IS_STUFFED(ea)) {
935 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
936 if (error)
937 return error;
938 }
939 es->ea_split = 0;
940 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
941 es->ea_split = 1;
942 else
943 return 0;
944
945 if (stuffed) {
946 error = ea_set_simple_noalloc(ip, bh, ea, es);
947 if (error)
948 return error;
949 } else {
950 unsigned int blks;
951
952 es->es_bh = bh;
953 es->es_ea = ea;
954 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
955 GFS2_SB(&ip->i_inode)->sd_jbsize);
956
957 error = ea_alloc_skeleton(ip, es->es_er, blks,
958 ea_set_simple_alloc, es);
959 if (error)
960 return error;
961 }
962
963 return 1;
964}
965
966static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
967 void *private)
968{
969 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
970 struct buffer_head *indbh, *newbh;
971 __be64 *eablk;
972 int error;
973 int mh_size = sizeof(struct gfs2_meta_header);
974
975 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
976 __be64 *end;
977
978 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
979 &indbh);
980 if (error)
981 return error;
982
983 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
984 error = -EIO;
985 goto out;
986 }
987
988 eablk = (__be64 *)(indbh->b_data + mh_size);
989 end = eablk + sdp->sd_inptrs;
990
991 for (; eablk < end; eablk++)
992 if (!*eablk)
993 break;
994
995 if (eablk == end) {
996 error = -ENOSPC;
997 goto out;
998 }
999
1000 gfs2_trans_add_meta(ip->i_gl, indbh);
1001 } else {
1002 u64 blk;
1003 unsigned int n = 1;
1004 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1005 if (error)
1006 return error;
1007 gfs2_trans_add_unrevoke(sdp, blk, 1);
1008 indbh = gfs2_meta_new(ip->i_gl, blk);
1009 gfs2_trans_add_meta(ip->i_gl, indbh);
1010 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1011 gfs2_buffer_clear_tail(indbh, mh_size);
1012
1013 eablk = (__be64 *)(indbh->b_data + mh_size);
1014 *eablk = cpu_to_be64(ip->i_eattr);
1015 ip->i_eattr = blk;
1016 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1017 gfs2_add_inode_blocks(&ip->i_inode, 1);
1018
1019 eablk++;
1020 }
1021
1022 error = ea_alloc_blk(ip, &newbh);
1023 if (error)
1024 goto out;
1025
1026 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1027 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1028 brelse(newbh);
1029 if (error)
1030 goto out;
1031
1032 if (private)
1033 ea_set_remove_stuffed(ip, private);
1034
1035out:
1036 brelse(indbh);
1037 return error;
1038}
1039
1040static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1041 const void *value, size_t size, struct gfs2_ea_location *el)
1042{
1043 struct gfs2_ea_request er;
1044 struct ea_set es;
1045 unsigned int blks = 2;
1046 int error;
1047
1048 er.er_type = type;
1049 er.er_name = name;
1050 er.er_data = (void *)value;
1051 er.er_name_len = strlen(name);
1052 er.er_data_len = size;
1053
1054 memset(&es, 0, sizeof(struct ea_set));
1055 es.es_er = &er;
1056 es.es_el = el;
1057
1058 error = ea_foreach(ip, ea_set_simple, &es);
1059 if (error > 0)
1060 return 0;
1061 if (error)
1062 return error;
1063
1064 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1065 blks++;
1066 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1067 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1068
1069 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1070}
1071
1072static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1073 struct gfs2_ea_location *el)
1074{
1075 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1076 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1077 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1078 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1079 }
1080
1081 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1082}
1083
1084static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1085{
1086 struct gfs2_ea_header *ea = el->el_ea;
1087 struct gfs2_ea_header *prev = el->el_prev;
1088 struct buffer_head *dibh;
1089 int error;
1090
1091 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1092 if (error)
1093 return error;
1094
1095 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1096
1097 if (prev) {
1098 u32 len;
1099
1100 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1101 prev->ea_rec_len = cpu_to_be32(len);
1102
1103 if (GFS2_EA_IS_LAST(ea))
1104 prev->ea_flags |= GFS2_EAFLAG_LAST;
1105 } else {
1106 ea->ea_type = GFS2_EATYPE_UNUSED;
1107 }
1108
1109 error = gfs2_meta_inode_buffer(ip, &dibh);
1110 if (!error) {
1111 ip->i_inode.i_ctime = CURRENT_TIME;
1112 gfs2_trans_add_meta(ip->i_gl, dibh);
1113 gfs2_dinode_out(ip, dibh->b_data);
1114 brelse(dibh);
1115 }
1116
1117 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1118
1119 return error;
1120}
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1136{
1137 struct gfs2_ea_location el;
1138 int error;
1139
1140 if (!ip->i_eattr)
1141 return -ENODATA;
1142
1143 error = gfs2_ea_find(ip, type, name, &el);
1144 if (error)
1145 return error;
1146 if (!el.el_ea)
1147 return -ENODATA;
1148
1149 if (GFS2_EA_IS_STUFFED(el.el_ea))
1150 error = ea_remove_stuffed(ip, &el);
1151 else
1152 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1153
1154 brelse(el.el_bh);
1155
1156 return error;
1157}
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173int __gfs2_xattr_set(struct inode *inode, const char *name,
1174 const void *value, size_t size, int flags, int type)
1175{
1176 struct gfs2_inode *ip = GFS2_I(inode);
1177 struct gfs2_sbd *sdp = GFS2_SB(inode);
1178 struct gfs2_ea_location el;
1179 unsigned int namel = strlen(name);
1180 int error;
1181
1182 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1183 return -EPERM;
1184 if (namel > GFS2_EA_MAX_NAME_LEN)
1185 return -ERANGE;
1186
1187 if (value == NULL)
1188 return gfs2_xattr_remove(ip, type, name);
1189
1190 if (ea_check_size(sdp, namel, size))
1191 return -ERANGE;
1192
1193 if (!ip->i_eattr) {
1194 if (flags & XATTR_REPLACE)
1195 return -ENODATA;
1196 return ea_init(ip, type, name, value, size);
1197 }
1198
1199 error = gfs2_ea_find(ip, type, name, &el);
1200 if (error)
1201 return error;
1202
1203 if (el.el_ea) {
1204 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1205 brelse(el.el_bh);
1206 return -EPERM;
1207 }
1208
1209 error = -EEXIST;
1210 if (!(flags & XATTR_CREATE)) {
1211 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1212 error = ea_set_i(ip, type, name, value, size, &el);
1213 if (!error && unstuffed)
1214 ea_set_remove_unstuffed(ip, &el);
1215 }
1216
1217 brelse(el.el_bh);
1218 return error;
1219 }
1220
1221 error = -ENODATA;
1222 if (!(flags & XATTR_REPLACE))
1223 error = ea_set_i(ip, type, name, value, size, NULL);
1224
1225 return error;
1226}
1227
1228static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1229 const void *value, size_t size, int flags, int type)
1230{
1231 return __gfs2_xattr_set(dentry->d_inode, name, value,
1232 size, flags, type);
1233}
1234
1235
1236static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1237 struct gfs2_ea_header *ea, char *data)
1238{
1239 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1240 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1241 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1242 int ret;
1243
1244 ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1245 if (ret)
1246 return ret;
1247
1248 ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1249 gfs2_trans_end(sdp);
1250
1251 return ret;
1252}
1253
1254int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1255{
1256 struct inode *inode = &ip->i_inode;
1257 struct gfs2_sbd *sdp = GFS2_SB(inode);
1258 struct gfs2_ea_location el;
1259 int error;
1260
1261 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1262 if (error)
1263 return error;
1264
1265 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1266 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1267 if (error == 0) {
1268 gfs2_trans_add_meta(ip->i_gl, el.el_bh);
1269 memcpy(GFS2_EA2DATA(el.el_ea), data,
1270 GFS2_EA_DATA_LEN(el.el_ea));
1271 }
1272 } else {
1273 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1274 }
1275
1276 brelse(el.el_bh);
1277 if (error)
1278 return error;
1279
1280 error = gfs2_setattr_simple(inode, attr);
1281 gfs2_trans_end(sdp);
1282 return error;
1283}
1284
1285static int ea_dealloc_indirect(struct gfs2_inode *ip)
1286{
1287 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1288 struct gfs2_rgrp_list rlist;
1289 struct buffer_head *indbh, *dibh;
1290 __be64 *eablk, *end;
1291 unsigned int rg_blocks = 0;
1292 u64 bstart = 0;
1293 unsigned int blen = 0;
1294 unsigned int blks = 0;
1295 unsigned int x;
1296 int error;
1297
1298 error = gfs2_rindex_update(sdp);
1299 if (error)
1300 return error;
1301
1302 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1303
1304 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1305 if (error)
1306 return error;
1307
1308 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1309 error = -EIO;
1310 goto out;
1311 }
1312
1313 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1314 end = eablk + sdp->sd_inptrs;
1315
1316 for (; eablk < end; eablk++) {
1317 u64 bn;
1318
1319 if (!*eablk)
1320 break;
1321 bn = be64_to_cpu(*eablk);
1322
1323 if (bstart + blen == bn)
1324 blen++;
1325 else {
1326 if (bstart)
1327 gfs2_rlist_add(ip, &rlist, bstart);
1328 bstart = bn;
1329 blen = 1;
1330 }
1331 blks++;
1332 }
1333 if (bstart)
1334 gfs2_rlist_add(ip, &rlist, bstart);
1335 else
1336 goto out;
1337
1338 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1339
1340 for (x = 0; x < rlist.rl_rgrps; x++) {
1341 struct gfs2_rgrpd *rgd;
1342 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1343 rg_blocks += rgd->rd_length;
1344 }
1345
1346 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1347 if (error)
1348 goto out_rlist_free;
1349
1350 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1351 RES_STATFS + RES_QUOTA, blks);
1352 if (error)
1353 goto out_gunlock;
1354
1355 gfs2_trans_add_meta(ip->i_gl, indbh);
1356
1357 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1358 bstart = 0;
1359 blen = 0;
1360
1361 for (; eablk < end; eablk++) {
1362 u64 bn;
1363
1364 if (!*eablk)
1365 break;
1366 bn = be64_to_cpu(*eablk);
1367
1368 if (bstart + blen == bn)
1369 blen++;
1370 else {
1371 if (bstart)
1372 gfs2_free_meta(ip, bstart, blen);
1373 bstart = bn;
1374 blen = 1;
1375 }
1376
1377 *eablk = 0;
1378 gfs2_add_inode_blocks(&ip->i_inode, -1);
1379 }
1380 if (bstart)
1381 gfs2_free_meta(ip, bstart, blen);
1382
1383 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1384
1385 error = gfs2_meta_inode_buffer(ip, &dibh);
1386 if (!error) {
1387 gfs2_trans_add_meta(ip->i_gl, dibh);
1388 gfs2_dinode_out(ip, dibh->b_data);
1389 brelse(dibh);
1390 }
1391
1392 gfs2_trans_end(sdp);
1393
1394out_gunlock:
1395 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1396out_rlist_free:
1397 gfs2_rlist_free(&rlist);
1398out:
1399 brelse(indbh);
1400 return error;
1401}
1402
1403static int ea_dealloc_block(struct gfs2_inode *ip)
1404{
1405 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1406 struct gfs2_rgrpd *rgd;
1407 struct buffer_head *dibh;
1408 struct gfs2_holder gh;
1409 int error;
1410
1411 error = gfs2_rindex_update(sdp);
1412 if (error)
1413 return error;
1414
1415 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1416 if (!rgd) {
1417 gfs2_consist_inode(ip);
1418 return -EIO;
1419 }
1420
1421 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1422 if (error)
1423 return error;
1424
1425 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1426 RES_QUOTA, 1);
1427 if (error)
1428 goto out_gunlock;
1429
1430 gfs2_free_meta(ip, ip->i_eattr, 1);
1431
1432 ip->i_eattr = 0;
1433 gfs2_add_inode_blocks(&ip->i_inode, -1);
1434
1435 error = gfs2_meta_inode_buffer(ip, &dibh);
1436 if (!error) {
1437 gfs2_trans_add_meta(ip->i_gl, dibh);
1438 gfs2_dinode_out(ip, dibh->b_data);
1439 brelse(dibh);
1440 }
1441
1442 gfs2_trans_end(sdp);
1443
1444out_gunlock:
1445 gfs2_glock_dq_uninit(&gh);
1446 return error;
1447}
1448
1449
1450
1451
1452
1453
1454
1455
1456int gfs2_ea_dealloc(struct gfs2_inode *ip)
1457{
1458 int error;
1459
1460 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1461 if (error)
1462 return error;
1463
1464 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1465 if (error)
1466 return error;
1467
1468 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1469 if (error)
1470 goto out_quota;
1471
1472 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1473 error = ea_dealloc_indirect(ip);
1474 if (error)
1475 goto out_quota;
1476 }
1477
1478 error = ea_dealloc_block(ip);
1479
1480out_quota:
1481 gfs2_quota_unhold(ip);
1482 return error;
1483}
1484
1485static const struct xattr_handler gfs2_xattr_user_handler = {
1486 .prefix = XATTR_USER_PREFIX,
1487 .flags = GFS2_EATYPE_USR,
1488 .get = gfs2_xattr_get,
1489 .set = gfs2_xattr_set,
1490};
1491
1492static const struct xattr_handler gfs2_xattr_security_handler = {
1493 .prefix = XATTR_SECURITY_PREFIX,
1494 .flags = GFS2_EATYPE_SECURITY,
1495 .get = gfs2_xattr_get,
1496 .set = gfs2_xattr_set,
1497};
1498
1499const struct xattr_handler *gfs2_xattr_handlers[] = {
1500 &gfs2_xattr_user_handler,
1501 &gfs2_xattr_security_handler,
1502 &gfs2_xattr_system_handler,
1503 NULL,
1504};
1505
1506
