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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 <linux/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 "super.h"
29#include "trans.h"
30#include "util.h"
31
32
33
34
35
36
37
38
39
40
41
42static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
43 unsigned int *size)
44{
45 unsigned int jbsize = sdp->sd_jbsize;
46
47
48 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
49
50 if (*size <= jbsize)
51 return 1;
52
53
54 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
55 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
56
57 return 0;
58}
59
60static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
61{
62 unsigned int size;
63
64 if (dsize > GFS2_EA_MAX_DATA_LEN)
65 return -ERANGE;
66
67 ea_calc_size(sdp, nsize, dsize, &size);
68
69
70 if (size > sdp->sd_jbsize)
71 return -ERANGE;
72
73 return 0;
74}
75
76typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
77 struct gfs2_ea_header *ea,
78 struct gfs2_ea_header *prev, void *private);
79
80static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
81 ea_call_t ea_call, void *data)
82{
83 struct gfs2_ea_header *ea, *prev = NULL;
84 int error = 0;
85
86 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
87 return -EIO;
88
89 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
90 if (!GFS2_EA_REC_LEN(ea))
91 goto fail;
92 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
93 bh->b_data + bh->b_size))
94 goto fail;
95 if (!GFS2_EATYPE_VALID(ea->ea_type))
96 goto fail;
97
98 error = ea_call(ip, bh, ea, prev, data);
99 if (error)
100 return error;
101
102 if (GFS2_EA_IS_LAST(ea)) {
103 if ((char *)GFS2_EA2NEXT(ea) !=
104 bh->b_data + bh->b_size)
105 goto fail;
106 break;
107 }
108 }
109
110 return error;
111
112fail:
113 gfs2_consist_inode(ip);
114 return -EIO;
115}
116
117static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
118{
119 struct buffer_head *bh, *eabh;
120 __be64 *eablk, *end;
121 int error;
122
123 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
124 if (error)
125 return error;
126
127 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
128 error = ea_foreach_i(ip, bh, ea_call, data);
129 goto out;
130 }
131
132 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
133 error = -EIO;
134 goto out;
135 }
136
137 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
138 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
139
140 for (; eablk < end; eablk++) {
141 u64 bn;
142
143 if (!*eablk)
144 break;
145 bn = be64_to_cpu(*eablk);
146
147 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
148 if (error)
149 break;
150 error = ea_foreach_i(ip, eabh, ea_call, data);
151 brelse(eabh);
152 if (error)
153 break;
154 }
155out:
156 brelse(bh);
157 return error;
158}
159
160struct ea_find {
161 int type;
162 const char *name;
163 size_t namel;
164 struct gfs2_ea_location *ef_el;
165};
166
167static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
168 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
169 void *private)
170{
171 struct ea_find *ef = private;
172
173 if (ea->ea_type == GFS2_EATYPE_UNUSED)
174 return 0;
175
176 if (ea->ea_type == ef->type) {
177 if (ea->ea_name_len == ef->namel &&
178 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
179 struct gfs2_ea_location *el = ef->ef_el;
180 get_bh(bh);
181 el->el_bh = bh;
182 el->el_ea = ea;
183 el->el_prev = prev;
184 return 1;
185 }
186 }
187
188 return 0;
189}
190
191static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
192 struct gfs2_ea_location *el)
193{
194 struct ea_find ef;
195 int error;
196
197 ef.type = type;
198 ef.name = name;
199 ef.namel = strlen(name);
200 ef.ef_el = el;
201
202 memset(el, 0, sizeof(struct gfs2_ea_location));
203
204 error = ea_foreach(ip, ea_find_i, &ef);
205 if (error > 0)
206 return 0;
207
208 return error;
209}
210
211
212
213
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215
216
217
218
219
220
221
222
223
224
225
226static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
227 struct gfs2_ea_header *ea,
228 struct gfs2_ea_header *prev, void *private)
229{
230 int *leave = private;
231 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
232 struct gfs2_rgrpd *rgd;
233 struct gfs2_holder rg_gh;
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 ip->i_inode.i_ctime = current_time(&ip->i_inode);
311 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
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 int error;
325
326 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
327 if (error)
328 return error;
329
330 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
331 if (error)
332 goto out_alloc;
333
334 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
335
336 gfs2_quota_unhold(ip);
337out_alloc:
338 return error;
339}
340
341struct ea_list {
342 struct gfs2_ea_request *ei_er;
343 unsigned int ei_size;
344};
345
346static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
347{
348 switch (ea->ea_type) {
349 case GFS2_EATYPE_USR:
350 return 5 + ea->ea_name_len + 1;
351 case GFS2_EATYPE_SYS:
352 return 7 + ea->ea_name_len + 1;
353 case GFS2_EATYPE_SECURITY:
354 return 9 + ea->ea_name_len + 1;
355 default:
356 return 0;
357 }
358}
359
360static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
361 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
362 void *private)
363{
364 struct ea_list *ei = private;
365 struct gfs2_ea_request *er = ei->ei_er;
366 unsigned int ea_size = gfs2_ea_strlen(ea);
367
368 if (ea->ea_type == GFS2_EATYPE_UNUSED)
369 return 0;
370
371 if (er->er_data_len) {
372 char *prefix = NULL;
373 unsigned int l = 0;
374 char c = 0;
375
376 if (ei->ei_size + ea_size > er->er_data_len)
377 return -ERANGE;
378
379 switch (ea->ea_type) {
380 case GFS2_EATYPE_USR:
381 prefix = "user.";
382 l = 5;
383 break;
384 case GFS2_EATYPE_SYS:
385 prefix = "system.";
386 l = 7;
387 break;
388 case GFS2_EATYPE_SECURITY:
389 prefix = "security.";
390 l = 9;
391 break;
392 }
393
394 BUG_ON(l == 0);
395
396 memcpy(er->er_data + ei->ei_size, prefix, l);
397 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
398 ea->ea_name_len);
399 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
400 }
401
402 ei->ei_size += ea_size;
403
404 return 0;
405}
406
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411
412
413
414
415
416ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
417{
418 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
419 struct gfs2_ea_request er;
420 struct gfs2_holder i_gh;
421 int error;
422
423 memset(&er, 0, sizeof(struct gfs2_ea_request));
424 if (size) {
425 er.er_data = buffer;
426 er.er_data_len = size;
427 }
428
429 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
430 if (error)
431 return error;
432
433 if (ip->i_eattr) {
434 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
435
436 error = ea_foreach(ip, ea_list_i, &ei);
437 if (!error)
438 error = ei.ei_size;
439 }
440
441 gfs2_glock_dq_uninit(&i_gh);
442
443 return error;
444}
445
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451
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455
456
457static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
458 const char *din, char *dout)
459{
460 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
461 struct buffer_head **bh;
462 unsigned int amount = GFS2_EA_DATA_LEN(ea);
463 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
464 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
465 unsigned int x;
466 int error = 0;
467 unsigned char *pos;
468 unsigned cp_size;
469
470 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
471 if (!bh)
472 return -ENOMEM;
473
474 for (x = 0; x < nptrs; x++) {
475 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
476 bh + x);
477 if (error) {
478 while (x--)
479 brelse(bh[x]);
480 goto out;
481 }
482 dataptrs++;
483 }
484
485 for (x = 0; x < nptrs; x++) {
486 error = gfs2_meta_wait(sdp, bh[x]);
487 if (error) {
488 for (; x < nptrs; x++)
489 brelse(bh[x]);
490 goto out;
491 }
492 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
493 for (; x < nptrs; x++)
494 brelse(bh[x]);
495 error = -EIO;
496 goto out;
497 }
498
499 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
500 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
501
502 if (dout) {
503 memcpy(dout, pos, cp_size);
504 dout += sdp->sd_jbsize;
505 }
506
507 if (din) {
508 gfs2_trans_add_meta(ip->i_gl, bh[x]);
509 memcpy(pos, din, cp_size);
510 din += sdp->sd_jbsize;
511 }
512
513 amount -= sdp->sd_jbsize;
514 brelse(bh[x]);
515 }
516
517out:
518 kfree(bh);
519 return error;
520}
521
522static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
523 char *data, size_t size)
524{
525 int ret;
526 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
527 if (len > size)
528 return -ERANGE;
529
530 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
531 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
532 return len;
533 }
534 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
535 if (ret < 0)
536 return ret;
537 return len;
538}
539
540int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
541{
542 struct gfs2_ea_location el;
543 int error;
544 int len;
545 char *data;
546
547 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
548 if (error)
549 return error;
550 if (!el.el_ea)
551 goto out;
552 if (!GFS2_EA_DATA_LEN(el.el_ea))
553 goto out;
554
555 len = GFS2_EA_DATA_LEN(el.el_ea);
556 data = kmalloc(len, GFP_NOFS);
557 error = -ENOMEM;
558 if (data == NULL)
559 goto out;
560
561 error = gfs2_ea_get_copy(ip, &el, data, len);
562 if (error < 0)
563 kfree(data);
564 else
565 *ppdata = data;
566out:
567 brelse(el.el_bh);
568 return error;
569}
570
571
572
573
574
575
576
577
578
579
580
581static int __gfs2_xattr_get(struct inode *inode, const char *name,
582 void *buffer, size_t size, int type)
583{
584 struct gfs2_inode *ip = GFS2_I(inode);
585 struct gfs2_ea_location el;
586 int error;
587
588 if (!ip->i_eattr)
589 return -ENODATA;
590 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
591 return -EINVAL;
592
593 error = gfs2_ea_find(ip, type, name, &el);
594 if (error)
595 return error;
596 if (!el.el_ea)
597 return -ENODATA;
598 if (size)
599 error = gfs2_ea_get_copy(ip, &el, buffer, size);
600 else
601 error = GFS2_EA_DATA_LEN(el.el_ea);
602 brelse(el.el_bh);
603
604 return error;
605}
606
607static int gfs2_xattr_get(const struct xattr_handler *handler,
608 struct dentry *unused, struct inode *inode,
609 const char *name, void *buffer, size_t size)
610{
611 struct gfs2_inode *ip = GFS2_I(inode);
612 struct gfs2_holder gh;
613 int ret;
614
615
616
617 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
618 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
619 if (ret)
620 return ret;
621 } else {
622 gfs2_holder_mark_uninitialized(&gh);
623 }
624 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
625 if (gfs2_holder_initialized(&gh))
626 gfs2_glock_dq_uninit(&gh);
627 return ret;
628}
629
630
631
632
633
634
635
636
637
638static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
639{
640 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
641 struct gfs2_ea_header *ea;
642 unsigned int n = 1;
643 u64 block;
644 int error;
645
646 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
647 if (error)
648 return error;
649 gfs2_trans_add_unrevoke(sdp, block, 1);
650 *bhp = gfs2_meta_new(ip->i_gl, block);
651 gfs2_trans_add_meta(ip->i_gl, *bhp);
652 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
653 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
654
655 ea = GFS2_EA_BH2FIRST(*bhp);
656 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
657 ea->ea_type = GFS2_EATYPE_UNUSED;
658 ea->ea_flags = GFS2_EAFLAG_LAST;
659 ea->ea_num_ptrs = 0;
660
661 gfs2_add_inode_blocks(&ip->i_inode, 1);
662
663 return 0;
664}
665
666
667
668
669
670
671
672
673
674
675
676
677
678static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
679 struct gfs2_ea_request *er)
680{
681 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
682 int error;
683
684 ea->ea_data_len = cpu_to_be32(er->er_data_len);
685 ea->ea_name_len = er->er_name_len;
686 ea->ea_type = er->er_type;
687 ea->__pad = 0;
688
689 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
690
691 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
692 ea->ea_num_ptrs = 0;
693 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
694 } else {
695 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
696 const char *data = er->er_data;
697 unsigned int data_len = er->er_data_len;
698 unsigned int copy;
699 unsigned int x;
700
701 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
702 for (x = 0; x < ea->ea_num_ptrs; x++) {
703 struct buffer_head *bh;
704 u64 block;
705 int mh_size = sizeof(struct gfs2_meta_header);
706 unsigned int n = 1;
707
708 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
709 if (error)
710 return error;
711 gfs2_trans_add_unrevoke(sdp, block, 1);
712 bh = gfs2_meta_new(ip->i_gl, block);
713 gfs2_trans_add_meta(ip->i_gl, bh);
714 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
715
716 gfs2_add_inode_blocks(&ip->i_inode, 1);
717
718 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
719 data_len;
720 memcpy(bh->b_data + mh_size, data, copy);
721 if (copy < sdp->sd_jbsize)
722 memset(bh->b_data + mh_size + copy, 0,
723 sdp->sd_jbsize - copy);
724
725 *dataptr++ = cpu_to_be64(bh->b_blocknr);
726 data += copy;
727 data_len -= copy;
728
729 brelse(bh);
730 }
731
732 gfs2_assert_withdraw(sdp, !data_len);
733 }
734
735 return 0;
736}
737
738typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
739 struct gfs2_ea_request *er, void *private);
740
741static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
742 unsigned int blks,
743 ea_skeleton_call_t skeleton_call, void *private)
744{
745 struct gfs2_alloc_parms ap = { .target = blks };
746 int error;
747
748 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
749 if (error)
750 return error;
751
752 error = gfs2_quota_lock_check(ip, &ap);
753 if (error)
754 return error;
755
756 error = gfs2_inplace_reserve(ip, &ap);
757 if (error)
758 goto out_gunlock_q;
759
760 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
761 blks + gfs2_rg_blocks(ip, blks) +
762 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
763 if (error)
764 goto out_ipres;
765
766 error = skeleton_call(ip, er, private);
767 if (error)
768 goto out_end_trans;
769
770 ip->i_inode.i_ctime = current_time(&ip->i_inode);
771 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
772
773out_end_trans:
774 gfs2_trans_end(GFS2_SB(&ip->i_inode));
775out_ipres:
776 gfs2_inplace_release(ip);
777out_gunlock_q:
778 gfs2_quota_unlock(ip);
779 return error;
780}
781
782static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
783 void *private)
784{
785 struct buffer_head *bh;
786 int error;
787
788 error = ea_alloc_blk(ip, &bh);
789 if (error)
790 return error;
791
792 ip->i_eattr = bh->b_blocknr;
793 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
794
795 brelse(bh);
796
797 return error;
798}
799
800
801
802
803
804
805
806
807
808static int ea_init(struct gfs2_inode *ip, int type, const char *name,
809 const void *data, size_t size)
810{
811 struct gfs2_ea_request er;
812 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
813 unsigned int blks = 1;
814
815 er.er_type = type;
816 er.er_name = name;
817 er.er_name_len = strlen(name);
818 er.er_data = (void *)data;
819 er.er_data_len = size;
820
821 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
822 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
823
824 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
825}
826
827static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
828{
829 u32 ea_size = GFS2_EA_SIZE(ea);
830 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
831 ea_size);
832 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
833 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
834
835 ea->ea_rec_len = cpu_to_be32(ea_size);
836 ea->ea_flags ^= last;
837
838 new->ea_rec_len = cpu_to_be32(new_size);
839 new->ea_flags = last;
840
841 return new;
842}
843
844static void ea_set_remove_stuffed(struct gfs2_inode *ip,
845 struct gfs2_ea_location *el)
846{
847 struct gfs2_ea_header *ea = el->el_ea;
848 struct gfs2_ea_header *prev = el->el_prev;
849 u32 len;
850
851 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
852
853 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
854 ea->ea_type = GFS2_EATYPE_UNUSED;
855 return;
856 } else if (GFS2_EA2NEXT(prev) != ea) {
857 prev = GFS2_EA2NEXT(prev);
858 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
859 }
860
861 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
862 prev->ea_rec_len = cpu_to_be32(len);
863
864 if (GFS2_EA_IS_LAST(ea))
865 prev->ea_flags |= GFS2_EAFLAG_LAST;
866}
867
868struct ea_set {
869 int ea_split;
870
871 struct gfs2_ea_request *es_er;
872 struct gfs2_ea_location *es_el;
873
874 struct buffer_head *es_bh;
875 struct gfs2_ea_header *es_ea;
876};
877
878static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
879 struct gfs2_ea_header *ea, struct ea_set *es)
880{
881 struct gfs2_ea_request *er = es->es_er;
882 int error;
883
884 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
885 if (error)
886 return error;
887
888 gfs2_trans_add_meta(ip->i_gl, bh);
889
890 if (es->ea_split)
891 ea = ea_split_ea(ea);
892
893 ea_write(ip, ea, er);
894
895 if (es->es_el)
896 ea_set_remove_stuffed(ip, es->es_el);
897
898 ip->i_inode.i_ctime = current_time(&ip->i_inode);
899 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
900
901 gfs2_trans_end(GFS2_SB(&ip->i_inode));
902 return error;
903}
904
905static int ea_set_simple_alloc(struct gfs2_inode *ip,
906 struct gfs2_ea_request *er, void *private)
907{
908 struct ea_set *es = private;
909 struct gfs2_ea_header *ea = es->es_ea;
910 int error;
911
912 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
913
914 if (es->ea_split)
915 ea = ea_split_ea(ea);
916
917 error = ea_write(ip, ea, er);
918 if (error)
919 return error;
920
921 if (es->es_el)
922 ea_set_remove_stuffed(ip, es->es_el);
923
924 return 0;
925}
926
927static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
928 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
929 void *private)
930{
931 struct ea_set *es = private;
932 unsigned int size;
933 int stuffed;
934 int error;
935
936 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
937 es->es_er->er_data_len, &size);
938
939 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
940 if (GFS2_EA_REC_LEN(ea) < size)
941 return 0;
942 if (!GFS2_EA_IS_STUFFED(ea)) {
943 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
944 if (error)
945 return error;
946 }
947 es->ea_split = 0;
948 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
949 es->ea_split = 1;
950 else
951 return 0;
952
953 if (stuffed) {
954 error = ea_set_simple_noalloc(ip, bh, ea, es);
955 if (error)
956 return error;
957 } else {
958 unsigned int blks;
959
960 es->es_bh = bh;
961 es->es_ea = ea;
962 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
963 GFS2_SB(&ip->i_inode)->sd_jbsize);
964
965 error = ea_alloc_skeleton(ip, es->es_er, blks,
966 ea_set_simple_alloc, es);
967 if (error)
968 return error;
969 }
970
971 return 1;
972}
973
974static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
975 void *private)
976{
977 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
978 struct buffer_head *indbh, *newbh;
979 __be64 *eablk;
980 int error;
981 int mh_size = sizeof(struct gfs2_meta_header);
982
983 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
984 __be64 *end;
985
986 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
987 &indbh);
988 if (error)
989 return error;
990
991 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
992 error = -EIO;
993 goto out;
994 }
995
996 eablk = (__be64 *)(indbh->b_data + mh_size);
997 end = eablk + sdp->sd_inptrs;
998
999 for (; eablk < end; eablk++)
1000 if (!*eablk)
1001 break;
1002
1003 if (eablk == end) {
1004 error = -ENOSPC;
1005 goto out;
1006 }
1007
1008 gfs2_trans_add_meta(ip->i_gl, indbh);
1009 } else {
1010 u64 blk;
1011 unsigned int n = 1;
1012 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1013 if (error)
1014 return error;
1015 gfs2_trans_add_unrevoke(sdp, blk, 1);
1016 indbh = gfs2_meta_new(ip->i_gl, blk);
1017 gfs2_trans_add_meta(ip->i_gl, indbh);
1018 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1019 gfs2_buffer_clear_tail(indbh, mh_size);
1020
1021 eablk = (__be64 *)(indbh->b_data + mh_size);
1022 *eablk = cpu_to_be64(ip->i_eattr);
1023 ip->i_eattr = blk;
1024 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1025 gfs2_add_inode_blocks(&ip->i_inode, 1);
1026
1027 eablk++;
1028 }
1029
1030 error = ea_alloc_blk(ip, &newbh);
1031 if (error)
1032 goto out;
1033
1034 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1035 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1036 brelse(newbh);
1037 if (error)
1038 goto out;
1039
1040 if (private)
1041 ea_set_remove_stuffed(ip, private);
1042
1043out:
1044 brelse(indbh);
1045 return error;
1046}
1047
1048static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1049 const void *value, size_t size, struct gfs2_ea_location *el)
1050{
1051 struct gfs2_ea_request er;
1052 struct ea_set es;
1053 unsigned int blks = 2;
1054 int error;
1055
1056 er.er_type = type;
1057 er.er_name = name;
1058 er.er_data = (void *)value;
1059 er.er_name_len = strlen(name);
1060 er.er_data_len = size;
1061
1062 memset(&es, 0, sizeof(struct ea_set));
1063 es.es_er = &er;
1064 es.es_el = el;
1065
1066 error = ea_foreach(ip, ea_set_simple, &es);
1067 if (error > 0)
1068 return 0;
1069 if (error)
1070 return error;
1071
1072 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1073 blks++;
1074 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1075 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1076
1077 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1078}
1079
1080static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1081 struct gfs2_ea_location *el)
1082{
1083 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1084 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1085 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1086 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1087 }
1088
1089 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1090}
1091
1092static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1093{
1094 struct gfs2_ea_header *ea = el->el_ea;
1095 struct gfs2_ea_header *prev = el->el_prev;
1096 int error;
1097
1098 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1099 if (error)
1100 return error;
1101
1102 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1103
1104 if (prev) {
1105 u32 len;
1106
1107 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1108 prev->ea_rec_len = cpu_to_be32(len);
1109
1110 if (GFS2_EA_IS_LAST(ea))
1111 prev->ea_flags |= GFS2_EAFLAG_LAST;
1112 } else {
1113 ea->ea_type = GFS2_EATYPE_UNUSED;
1114 }
1115
1116 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1117 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1118
1119 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1120
1121 return error;
1122}
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1138{
1139 struct gfs2_ea_location el;
1140 int error;
1141
1142 if (!ip->i_eattr)
1143 return -ENODATA;
1144
1145 error = gfs2_ea_find(ip, type, name, &el);
1146 if (error)
1147 return error;
1148 if (!el.el_ea)
1149 return -ENODATA;
1150
1151 if (GFS2_EA_IS_STUFFED(el.el_ea))
1152 error = ea_remove_stuffed(ip, &el);
1153 else
1154 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1155
1156 brelse(el.el_bh);
1157
1158 return error;
1159}
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175int __gfs2_xattr_set(struct inode *inode, const char *name,
1176 const void *value, size_t size, int flags, int type)
1177{
1178 struct gfs2_inode *ip = GFS2_I(inode);
1179 struct gfs2_sbd *sdp = GFS2_SB(inode);
1180 struct gfs2_ea_location el;
1181 unsigned int namel = strlen(name);
1182 int error;
1183
1184 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1185 return -EPERM;
1186 if (namel > GFS2_EA_MAX_NAME_LEN)
1187 return -ERANGE;
1188
1189 if (value == NULL) {
1190 error = gfs2_xattr_remove(ip, type, name);
1191 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1192 error = 0;
1193 return error;
1194 }
1195
1196 if (ea_check_size(sdp, namel, size))
1197 return -ERANGE;
1198
1199 if (!ip->i_eattr) {
1200 if (flags & XATTR_REPLACE)
1201 return -ENODATA;
1202 return ea_init(ip, type, name, value, size);
1203 }
1204
1205 error = gfs2_ea_find(ip, type, name, &el);
1206 if (error)
1207 return error;
1208
1209 if (el.el_ea) {
1210 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1211 brelse(el.el_bh);
1212 return -EPERM;
1213 }
1214
1215 error = -EEXIST;
1216 if (!(flags & XATTR_CREATE)) {
1217 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1218 error = ea_set_i(ip, type, name, value, size, &el);
1219 if (!error && unstuffed)
1220 ea_set_remove_unstuffed(ip, &el);
1221 }
1222
1223 brelse(el.el_bh);
1224 return error;
1225 }
1226
1227 error = -ENODATA;
1228 if (!(flags & XATTR_REPLACE))
1229 error = ea_set_i(ip, type, name, value, size, NULL);
1230
1231 return error;
1232}
1233
1234static int gfs2_xattr_set(const struct xattr_handler *handler,
1235 struct dentry *unused, struct inode *inode,
1236 const char *name, const void *value,
1237 size_t size, int flags)
1238{
1239 struct gfs2_inode *ip = GFS2_I(inode);
1240 struct gfs2_holder gh;
1241 int ret;
1242
1243 ret = gfs2_rsqa_alloc(ip);
1244 if (ret)
1245 return ret;
1246
1247
1248
1249 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1250 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1251 if (ret)
1252 return ret;
1253 } else {
1254 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
1255 return -EIO;
1256 gfs2_holder_mark_uninitialized(&gh);
1257 }
1258 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1259 if (gfs2_holder_initialized(&gh))
1260 gfs2_glock_dq_uninit(&gh);
1261 return ret;
1262}
1263
1264static int ea_dealloc_indirect(struct gfs2_inode *ip)
1265{
1266 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1267 struct gfs2_rgrp_list rlist;
1268 struct buffer_head *indbh, *dibh;
1269 __be64 *eablk, *end;
1270 unsigned int rg_blocks = 0;
1271 u64 bstart = 0;
1272 unsigned int blen = 0;
1273 unsigned int blks = 0;
1274 unsigned int x;
1275 int error;
1276
1277 error = gfs2_rindex_update(sdp);
1278 if (error)
1279 return error;
1280
1281 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1282
1283 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1284 if (error)
1285 return error;
1286
1287 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1288 error = -EIO;
1289 goto out;
1290 }
1291
1292 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1293 end = eablk + sdp->sd_inptrs;
1294
1295 for (; eablk < end; eablk++) {
1296 u64 bn;
1297
1298 if (!*eablk)
1299 break;
1300 bn = be64_to_cpu(*eablk);
1301
1302 if (bstart + blen == bn)
1303 blen++;
1304 else {
1305 if (bstart)
1306 gfs2_rlist_add(ip, &rlist, bstart);
1307 bstart = bn;
1308 blen = 1;
1309 }
1310 blks++;
1311 }
1312 if (bstart)
1313 gfs2_rlist_add(ip, &rlist, bstart);
1314 else
1315 goto out;
1316
1317 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1318
1319 for (x = 0; x < rlist.rl_rgrps; x++) {
1320 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1321
1322 rg_blocks += rgd->rd_length;
1323 }
1324
1325 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1326 if (error)
1327 goto out_rlist_free;
1328
1329 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1330 RES_STATFS + RES_QUOTA, blks);
1331 if (error)
1332 goto out_gunlock;
1333
1334 gfs2_trans_add_meta(ip->i_gl, indbh);
1335
1336 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1337 bstart = 0;
1338 blen = 0;
1339
1340 for (; eablk < end; eablk++) {
1341 u64 bn;
1342
1343 if (!*eablk)
1344 break;
1345 bn = be64_to_cpu(*eablk);
1346
1347 if (bstart + blen == bn)
1348 blen++;
1349 else {
1350 if (bstart)
1351 gfs2_free_meta(ip, bstart, blen);
1352 bstart = bn;
1353 blen = 1;
1354 }
1355
1356 *eablk = 0;
1357 gfs2_add_inode_blocks(&ip->i_inode, -1);
1358 }
1359 if (bstart)
1360 gfs2_free_meta(ip, bstart, blen);
1361
1362 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1363
1364 error = gfs2_meta_inode_buffer(ip, &dibh);
1365 if (!error) {
1366 gfs2_trans_add_meta(ip->i_gl, dibh);
1367 gfs2_dinode_out(ip, dibh->b_data);
1368 brelse(dibh);
1369 }
1370
1371 gfs2_trans_end(sdp);
1372
1373out_gunlock:
1374 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1375out_rlist_free:
1376 gfs2_rlist_free(&rlist);
1377out:
1378 brelse(indbh);
1379 return error;
1380}
1381
1382static int ea_dealloc_block(struct gfs2_inode *ip)
1383{
1384 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1385 struct gfs2_rgrpd *rgd;
1386 struct buffer_head *dibh;
1387 struct gfs2_holder gh;
1388 int error;
1389
1390 error = gfs2_rindex_update(sdp);
1391 if (error)
1392 return error;
1393
1394 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1395 if (!rgd) {
1396 gfs2_consist_inode(ip);
1397 return -EIO;
1398 }
1399
1400 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1401 if (error)
1402 return error;
1403
1404 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1405 RES_QUOTA, 1);
1406 if (error)
1407 goto out_gunlock;
1408
1409 gfs2_free_meta(ip, ip->i_eattr, 1);
1410
1411 ip->i_eattr = 0;
1412 gfs2_add_inode_blocks(&ip->i_inode, -1);
1413
1414 error = gfs2_meta_inode_buffer(ip, &dibh);
1415 if (!error) {
1416 gfs2_trans_add_meta(ip->i_gl, dibh);
1417 gfs2_dinode_out(ip, dibh->b_data);
1418 brelse(dibh);
1419 }
1420
1421 gfs2_trans_end(sdp);
1422
1423out_gunlock:
1424 gfs2_glock_dq_uninit(&gh);
1425 return error;
1426}
1427
1428
1429
1430
1431
1432
1433
1434
1435int gfs2_ea_dealloc(struct gfs2_inode *ip)
1436{
1437 int error;
1438
1439 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1440 if (error)
1441 return error;
1442
1443 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1444 if (error)
1445 return error;
1446
1447 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1448 if (error)
1449 goto out_quota;
1450
1451 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1452 error = ea_dealloc_indirect(ip);
1453 if (error)
1454 goto out_quota;
1455 }
1456
1457 error = ea_dealloc_block(ip);
1458
1459out_quota:
1460 gfs2_quota_unhold(ip);
1461 return error;
1462}
1463
1464static const struct xattr_handler gfs2_xattr_user_handler = {
1465 .prefix = XATTR_USER_PREFIX,
1466 .flags = GFS2_EATYPE_USR,
1467 .get = gfs2_xattr_get,
1468 .set = gfs2_xattr_set,
1469};
1470
1471static const struct xattr_handler gfs2_xattr_security_handler = {
1472 .prefix = XATTR_SECURITY_PREFIX,
1473 .flags = GFS2_EATYPE_SECURITY,
1474 .get = gfs2_xattr_get,
1475 .set = gfs2_xattr_set,
1476};
1477
1478const struct xattr_handler *gfs2_xattr_handlers[] = {
1479 &gfs2_xattr_user_handler,
1480 &gfs2_xattr_security_handler,
1481 &posix_acl_access_xattr_handler,
1482 &posix_acl_default_xattr_handler,
1483 NULL,
1484};
1485
1486
