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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, 0, &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, 0, &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
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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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453
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455
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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, 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(const struct xattr_handler *handler,
587 struct dentry *dentry, const char *name,
588 void *buffer, size_t size)
589{
590 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
591 struct gfs2_ea_location el;
592 int type = handler->flags;
593 int error;
594
595 if (!ip->i_eattr)
596 return -ENODATA;
597 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
598 return -EINVAL;
599
600 error = gfs2_ea_find(ip, type, name, &el);
601 if (error)
602 return error;
603 if (!el.el_ea)
604 return -ENODATA;
605 if (size)
606 error = gfs2_ea_get_copy(ip, &el, buffer, size);
607 else
608 error = GFS2_EA_DATA_LEN(el.el_ea);
609 brelse(el.el_bh);
610
611 return error;
612}
613
614
615
616
617
618
619
620
621
622static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
623{
624 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
625 struct gfs2_ea_header *ea;
626 unsigned int n = 1;
627 u64 block;
628 int error;
629
630 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
631 if (error)
632 return error;
633 gfs2_trans_add_unrevoke(sdp, block, 1);
634 *bhp = gfs2_meta_new(ip->i_gl, block);
635 gfs2_trans_add_meta(ip->i_gl, *bhp);
636 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
637 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
638
639 ea = GFS2_EA_BH2FIRST(*bhp);
640 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
641 ea->ea_type = GFS2_EATYPE_UNUSED;
642 ea->ea_flags = GFS2_EAFLAG_LAST;
643 ea->ea_num_ptrs = 0;
644
645 gfs2_add_inode_blocks(&ip->i_inode, 1);
646
647 return 0;
648}
649
650
651
652
653
654
655
656
657
658
659
660
661
662static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
663 struct gfs2_ea_request *er)
664{
665 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
666 int error;
667
668 ea->ea_data_len = cpu_to_be32(er->er_data_len);
669 ea->ea_name_len = er->er_name_len;
670 ea->ea_type = er->er_type;
671 ea->__pad = 0;
672
673 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
674
675 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
676 ea->ea_num_ptrs = 0;
677 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
678 } else {
679 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
680 const char *data = er->er_data;
681 unsigned int data_len = er->er_data_len;
682 unsigned int copy;
683 unsigned int x;
684
685 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
686 for (x = 0; x < ea->ea_num_ptrs; x++) {
687 struct buffer_head *bh;
688 u64 block;
689 int mh_size = sizeof(struct gfs2_meta_header);
690 unsigned int n = 1;
691
692 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
693 if (error)
694 return error;
695 gfs2_trans_add_unrevoke(sdp, block, 1);
696 bh = gfs2_meta_new(ip->i_gl, block);
697 gfs2_trans_add_meta(ip->i_gl, bh);
698 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
699
700 gfs2_add_inode_blocks(&ip->i_inode, 1);
701
702 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
703 data_len;
704 memcpy(bh->b_data + mh_size, data, copy);
705 if (copy < sdp->sd_jbsize)
706 memset(bh->b_data + mh_size + copy, 0,
707 sdp->sd_jbsize - copy);
708
709 *dataptr++ = cpu_to_be64(bh->b_blocknr);
710 data += copy;
711 data_len -= copy;
712
713 brelse(bh);
714 }
715
716 gfs2_assert_withdraw(sdp, !data_len);
717 }
718
719 return 0;
720}
721
722typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
723 struct gfs2_ea_request *er, void *private);
724
725static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
726 unsigned int blks,
727 ea_skeleton_call_t skeleton_call, void *private)
728{
729 struct gfs2_alloc_parms ap = { .target = blks };
730 struct buffer_head *dibh;
731 int error;
732
733 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
734 if (error)
735 return error;
736
737 error = gfs2_quota_lock_check(ip, &ap);
738 if (error)
739 return error;
740
741 error = gfs2_inplace_reserve(ip, &ap);
742 if (error)
743 goto out_gunlock_q;
744
745 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
746 blks + gfs2_rg_blocks(ip, blks) +
747 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
748 if (error)
749 goto out_ipres;
750
751 error = skeleton_call(ip, er, private);
752 if (error)
753 goto out_end_trans;
754
755 error = gfs2_meta_inode_buffer(ip, &dibh);
756 if (!error) {
757 ip->i_inode.i_ctime = CURRENT_TIME;
758 gfs2_trans_add_meta(ip->i_gl, dibh);
759 gfs2_dinode_out(ip, dibh->b_data);
760 brelse(dibh);
761 }
762
763out_end_trans:
764 gfs2_trans_end(GFS2_SB(&ip->i_inode));
765out_ipres:
766 gfs2_inplace_release(ip);
767out_gunlock_q:
768 gfs2_quota_unlock(ip);
769 return error;
770}
771
772static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
773 void *private)
774{
775 struct buffer_head *bh;
776 int error;
777
778 error = ea_alloc_blk(ip, &bh);
779 if (error)
780 return error;
781
782 ip->i_eattr = bh->b_blocknr;
783 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
784
785 brelse(bh);
786
787 return error;
788}
789
790
791
792
793
794
795
796
797
798static int ea_init(struct gfs2_inode *ip, int type, const char *name,
799 const void *data, size_t size)
800{
801 struct gfs2_ea_request er;
802 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
803 unsigned int blks = 1;
804
805 er.er_type = type;
806 er.er_name = name;
807 er.er_name_len = strlen(name);
808 er.er_data = (void *)data;
809 er.er_data_len = size;
810
811 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
812 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
813
814 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
815}
816
817static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
818{
819 u32 ea_size = GFS2_EA_SIZE(ea);
820 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
821 ea_size);
822 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
823 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
824
825 ea->ea_rec_len = cpu_to_be32(ea_size);
826 ea->ea_flags ^= last;
827
828 new->ea_rec_len = cpu_to_be32(new_size);
829 new->ea_flags = last;
830
831 return new;
832}
833
834static void ea_set_remove_stuffed(struct gfs2_inode *ip,
835 struct gfs2_ea_location *el)
836{
837 struct gfs2_ea_header *ea = el->el_ea;
838 struct gfs2_ea_header *prev = el->el_prev;
839 u32 len;
840
841 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
842
843 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
844 ea->ea_type = GFS2_EATYPE_UNUSED;
845 return;
846 } else if (GFS2_EA2NEXT(prev) != ea) {
847 prev = GFS2_EA2NEXT(prev);
848 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
849 }
850
851 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
852 prev->ea_rec_len = cpu_to_be32(len);
853
854 if (GFS2_EA_IS_LAST(ea))
855 prev->ea_flags |= GFS2_EAFLAG_LAST;
856}
857
858struct ea_set {
859 int ea_split;
860
861 struct gfs2_ea_request *es_er;
862 struct gfs2_ea_location *es_el;
863
864 struct buffer_head *es_bh;
865 struct gfs2_ea_header *es_ea;
866};
867
868static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
869 struct gfs2_ea_header *ea, struct ea_set *es)
870{
871 struct gfs2_ea_request *er = es->es_er;
872 struct buffer_head *dibh;
873 int error;
874
875 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
876 if (error)
877 return error;
878
879 gfs2_trans_add_meta(ip->i_gl, bh);
880
881 if (es->ea_split)
882 ea = ea_split_ea(ea);
883
884 ea_write(ip, ea, er);
885
886 if (es->es_el)
887 ea_set_remove_stuffed(ip, es->es_el);
888
889 error = gfs2_meta_inode_buffer(ip, &dibh);
890 if (error)
891 goto out;
892 ip->i_inode.i_ctime = CURRENT_TIME;
893 gfs2_trans_add_meta(ip->i_gl, dibh);
894 gfs2_dinode_out(ip, dibh->b_data);
895 brelse(dibh);
896out:
897 gfs2_trans_end(GFS2_SB(&ip->i_inode));
898 return error;
899}
900
901static int ea_set_simple_alloc(struct gfs2_inode *ip,
902 struct gfs2_ea_request *er, void *private)
903{
904 struct ea_set *es = private;
905 struct gfs2_ea_header *ea = es->es_ea;
906 int error;
907
908 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
909
910 if (es->ea_split)
911 ea = ea_split_ea(ea);
912
913 error = ea_write(ip, ea, er);
914 if (error)
915 return error;
916
917 if (es->es_el)
918 ea_set_remove_stuffed(ip, es->es_el);
919
920 return 0;
921}
922
923static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
924 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
925 void *private)
926{
927 struct ea_set *es = private;
928 unsigned int size;
929 int stuffed;
930 int error;
931
932 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
933 es->es_er->er_data_len, &size);
934
935 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
936 if (GFS2_EA_REC_LEN(ea) < size)
937 return 0;
938 if (!GFS2_EA_IS_STUFFED(ea)) {
939 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
940 if (error)
941 return error;
942 }
943 es->ea_split = 0;
944 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
945 es->ea_split = 1;
946 else
947 return 0;
948
949 if (stuffed) {
950 error = ea_set_simple_noalloc(ip, bh, ea, es);
951 if (error)
952 return error;
953 } else {
954 unsigned int blks;
955
956 es->es_bh = bh;
957 es->es_ea = ea;
958 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
959 GFS2_SB(&ip->i_inode)->sd_jbsize);
960
961 error = ea_alloc_skeleton(ip, es->es_er, blks,
962 ea_set_simple_alloc, es);
963 if (error)
964 return error;
965 }
966
967 return 1;
968}
969
970static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
971 void *private)
972{
973 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
974 struct buffer_head *indbh, *newbh;
975 __be64 *eablk;
976 int error;
977 int mh_size = sizeof(struct gfs2_meta_header);
978
979 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
980 __be64 *end;
981
982 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
983 &indbh);
984 if (error)
985 return error;
986
987 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
988 error = -EIO;
989 goto out;
990 }
991
992 eablk = (__be64 *)(indbh->b_data + mh_size);
993 end = eablk + sdp->sd_inptrs;
994
995 for (; eablk < end; eablk++)
996 if (!*eablk)
997 break;
998
999 if (eablk == end) {
1000 error = -ENOSPC;
1001 goto out;
1002 }
1003
1004 gfs2_trans_add_meta(ip->i_gl, indbh);
1005 } else {
1006 u64 blk;
1007 unsigned int n = 1;
1008 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1009 if (error)
1010 return error;
1011 gfs2_trans_add_unrevoke(sdp, blk, 1);
1012 indbh = gfs2_meta_new(ip->i_gl, blk);
1013 gfs2_trans_add_meta(ip->i_gl, indbh);
1014 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1015 gfs2_buffer_clear_tail(indbh, mh_size);
1016
1017 eablk = (__be64 *)(indbh->b_data + mh_size);
1018 *eablk = cpu_to_be64(ip->i_eattr);
1019 ip->i_eattr = blk;
1020 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1021 gfs2_add_inode_blocks(&ip->i_inode, 1);
1022
1023 eablk++;
1024 }
1025
1026 error = ea_alloc_blk(ip, &newbh);
1027 if (error)
1028 goto out;
1029
1030 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1031 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1032 brelse(newbh);
1033 if (error)
1034 goto out;
1035
1036 if (private)
1037 ea_set_remove_stuffed(ip, private);
1038
1039out:
1040 brelse(indbh);
1041 return error;
1042}
1043
1044static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1045 const void *value, size_t size, struct gfs2_ea_location *el)
1046{
1047 struct gfs2_ea_request er;
1048 struct ea_set es;
1049 unsigned int blks = 2;
1050 int error;
1051
1052 er.er_type = type;
1053 er.er_name = name;
1054 er.er_data = (void *)value;
1055 er.er_name_len = strlen(name);
1056 er.er_data_len = size;
1057
1058 memset(&es, 0, sizeof(struct ea_set));
1059 es.es_er = &er;
1060 es.es_el = el;
1061
1062 error = ea_foreach(ip, ea_set_simple, &es);
1063 if (error > 0)
1064 return 0;
1065 if (error)
1066 return error;
1067
1068 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1069 blks++;
1070 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1071 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1072
1073 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1074}
1075
1076static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1077 struct gfs2_ea_location *el)
1078{
1079 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1080 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1081 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1082 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1083 }
1084
1085 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1086}
1087
1088static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1089{
1090 struct gfs2_ea_header *ea = el->el_ea;
1091 struct gfs2_ea_header *prev = el->el_prev;
1092 struct buffer_head *dibh;
1093 int error;
1094
1095 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1096 if (error)
1097 return error;
1098
1099 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1100
1101 if (prev) {
1102 u32 len;
1103
1104 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1105 prev->ea_rec_len = cpu_to_be32(len);
1106
1107 if (GFS2_EA_IS_LAST(ea))
1108 prev->ea_flags |= GFS2_EAFLAG_LAST;
1109 } else {
1110 ea->ea_type = GFS2_EATYPE_UNUSED;
1111 }
1112
1113 error = gfs2_meta_inode_buffer(ip, &dibh);
1114 if (!error) {
1115 ip->i_inode.i_ctime = CURRENT_TIME;
1116 gfs2_trans_add_meta(ip->i_gl, dibh);
1117 gfs2_dinode_out(ip, dibh->b_data);
1118 brelse(dibh);
1119 }
1120
1121 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1122
1123 return error;
1124}
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1140{
1141 struct gfs2_ea_location el;
1142 int error;
1143
1144 if (!ip->i_eattr)
1145 return -ENODATA;
1146
1147 error = gfs2_ea_find(ip, type, name, &el);
1148 if (error)
1149 return error;
1150 if (!el.el_ea)
1151 return -ENODATA;
1152
1153 if (GFS2_EA_IS_STUFFED(el.el_ea))
1154 error = ea_remove_stuffed(ip, &el);
1155 else
1156 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1157
1158 brelse(el.el_bh);
1159
1160 return error;
1161}
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177int __gfs2_xattr_set(struct inode *inode, const char *name,
1178 const void *value, size_t size, int flags, int type)
1179{
1180 struct gfs2_inode *ip = GFS2_I(inode);
1181 struct gfs2_sbd *sdp = GFS2_SB(inode);
1182 struct gfs2_ea_location el;
1183 unsigned int namel = strlen(name);
1184 int error;
1185
1186 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1187 return -EPERM;
1188 if (namel > GFS2_EA_MAX_NAME_LEN)
1189 return -ERANGE;
1190
1191 if (value == NULL)
1192 return gfs2_xattr_remove(ip, type, name);
1193
1194 if (ea_check_size(sdp, namel, size))
1195 return -ERANGE;
1196
1197 if (!ip->i_eattr) {
1198 if (flags & XATTR_REPLACE)
1199 return -ENODATA;
1200 return ea_init(ip, type, name, value, size);
1201 }
1202
1203 error = gfs2_ea_find(ip, type, name, &el);
1204 if (error)
1205 return error;
1206
1207 if (el.el_ea) {
1208 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1209 brelse(el.el_bh);
1210 return -EPERM;
1211 }
1212
1213 error = -EEXIST;
1214 if (!(flags & XATTR_CREATE)) {
1215 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1216 error = ea_set_i(ip, type, name, value, size, &el);
1217 if (!error && unstuffed)
1218 ea_set_remove_unstuffed(ip, &el);
1219 }
1220
1221 brelse(el.el_bh);
1222 return error;
1223 }
1224
1225 error = -ENODATA;
1226 if (!(flags & XATTR_REPLACE))
1227 error = ea_set_i(ip, type, name, value, size, NULL);
1228
1229 return error;
1230}
1231
1232static int gfs2_xattr_set(const struct xattr_handler *handler,
1233 struct dentry *dentry, const char *name,
1234 const void *value, size_t size, int flags)
1235{
1236 return __gfs2_xattr_set(d_inode(dentry), name, value,
1237 size, flags, handler->flags);
1238}
1239
1240static int ea_dealloc_indirect(struct gfs2_inode *ip)
1241{
1242 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1243 struct gfs2_rgrp_list rlist;
1244 struct buffer_head *indbh, *dibh;
1245 __be64 *eablk, *end;
1246 unsigned int rg_blocks = 0;
1247 u64 bstart = 0;
1248 unsigned int blen = 0;
1249 unsigned int blks = 0;
1250 unsigned int x;
1251 int error;
1252
1253 error = gfs2_rindex_update(sdp);
1254 if (error)
1255 return error;
1256
1257 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1258
1259 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1260 if (error)
1261 return error;
1262
1263 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1264 error = -EIO;
1265 goto out;
1266 }
1267
1268 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1269 end = eablk + sdp->sd_inptrs;
1270
1271 for (; eablk < end; eablk++) {
1272 u64 bn;
1273
1274 if (!*eablk)
1275 break;
1276 bn = be64_to_cpu(*eablk);
1277
1278 if (bstart + blen == bn)
1279 blen++;
1280 else {
1281 if (bstart)
1282 gfs2_rlist_add(ip, &rlist, bstart);
1283 bstart = bn;
1284 blen = 1;
1285 }
1286 blks++;
1287 }
1288 if (bstart)
1289 gfs2_rlist_add(ip, &rlist, bstart);
1290 else
1291 goto out;
1292
1293 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1294
1295 for (x = 0; x < rlist.rl_rgrps; x++) {
1296 struct gfs2_rgrpd *rgd;
1297 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1298 rg_blocks += rgd->rd_length;
1299 }
1300
1301 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1302 if (error)
1303 goto out_rlist_free;
1304
1305 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1306 RES_STATFS + RES_QUOTA, blks);
1307 if (error)
1308 goto out_gunlock;
1309
1310 gfs2_trans_add_meta(ip->i_gl, indbh);
1311
1312 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1313 bstart = 0;
1314 blen = 0;
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_free_meta(ip, bstart, blen);
1328 bstart = bn;
1329 blen = 1;
1330 }
1331
1332 *eablk = 0;
1333 gfs2_add_inode_blocks(&ip->i_inode, -1);
1334 }
1335 if (bstart)
1336 gfs2_free_meta(ip, bstart, blen);
1337
1338 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1339
1340 error = gfs2_meta_inode_buffer(ip, &dibh);
1341 if (!error) {
1342 gfs2_trans_add_meta(ip->i_gl, dibh);
1343 gfs2_dinode_out(ip, dibh->b_data);
1344 brelse(dibh);
1345 }
1346
1347 gfs2_trans_end(sdp);
1348
1349out_gunlock:
1350 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1351out_rlist_free:
1352 gfs2_rlist_free(&rlist);
1353out:
1354 brelse(indbh);
1355 return error;
1356}
1357
1358static int ea_dealloc_block(struct gfs2_inode *ip)
1359{
1360 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1361 struct gfs2_rgrpd *rgd;
1362 struct buffer_head *dibh;
1363 struct gfs2_holder gh;
1364 int error;
1365
1366 error = gfs2_rindex_update(sdp);
1367 if (error)
1368 return error;
1369
1370 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1371 if (!rgd) {
1372 gfs2_consist_inode(ip);
1373 return -EIO;
1374 }
1375
1376 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1377 if (error)
1378 return error;
1379
1380 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1381 RES_QUOTA, 1);
1382 if (error)
1383 goto out_gunlock;
1384
1385 gfs2_free_meta(ip, ip->i_eattr, 1);
1386
1387 ip->i_eattr = 0;
1388 gfs2_add_inode_blocks(&ip->i_inode, -1);
1389
1390 error = gfs2_meta_inode_buffer(ip, &dibh);
1391 if (!error) {
1392 gfs2_trans_add_meta(ip->i_gl, dibh);
1393 gfs2_dinode_out(ip, dibh->b_data);
1394 brelse(dibh);
1395 }
1396
1397 gfs2_trans_end(sdp);
1398
1399out_gunlock:
1400 gfs2_glock_dq_uninit(&gh);
1401 return error;
1402}
1403
1404
1405
1406
1407
1408
1409
1410
1411int gfs2_ea_dealloc(struct gfs2_inode *ip)
1412{
1413 int error;
1414
1415 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1416 if (error)
1417 return error;
1418
1419 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1420 if (error)
1421 return error;
1422
1423 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1424 if (error)
1425 goto out_quota;
1426
1427 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1428 error = ea_dealloc_indirect(ip);
1429 if (error)
1430 goto out_quota;
1431 }
1432
1433 error = ea_dealloc_block(ip);
1434
1435out_quota:
1436 gfs2_quota_unhold(ip);
1437 return error;
1438}
1439
1440static const struct xattr_handler gfs2_xattr_user_handler = {
1441 .prefix = XATTR_USER_PREFIX,
1442 .flags = GFS2_EATYPE_USR,
1443 .get = gfs2_xattr_get,
1444 .set = gfs2_xattr_set,
1445};
1446
1447static const struct xattr_handler gfs2_xattr_security_handler = {
1448 .prefix = XATTR_SECURITY_PREFIX,
1449 .flags = GFS2_EATYPE_SECURITY,
1450 .get = gfs2_xattr_get,
1451 .set = gfs2_xattr_set,
1452};
1453
1454const struct xattr_handler *gfs2_xattr_handlers[] = {
1455 &gfs2_xattr_user_handler,
1456 &gfs2_xattr_security_handler,
1457 &posix_acl_access_xattr_handler,
1458 &posix_acl_default_xattr_handler,
1459 NULL,
1460};
1461
1462
