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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 "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
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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(&ip->i_inode);
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}
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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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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
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577
578
579
580
581
582
583
584
585
586static int __gfs2_xattr_get(struct inode *inode, const char *name,
587 void *buffer, size_t size, int type)
588{
589 struct gfs2_inode *ip = GFS2_I(inode);
590 struct gfs2_ea_location el;
591 int error;
592
593 if (!ip->i_eattr)
594 return -ENODATA;
595 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
596 return -EINVAL;
597
598 error = gfs2_ea_find(ip, type, name, &el);
599 if (error)
600 return error;
601 if (!el.el_ea)
602 return -ENODATA;
603 if (size)
604 error = gfs2_ea_get_copy(ip, &el, buffer, size);
605 else
606 error = GFS2_EA_DATA_LEN(el.el_ea);
607 brelse(el.el_bh);
608
609 return error;
610}
611
612static int gfs2_xattr_get(const struct xattr_handler *handler,
613 struct dentry *unused, struct inode *inode,
614 const char *name, void *buffer, size_t size)
615{
616 struct gfs2_inode *ip = GFS2_I(inode);
617 struct gfs2_holder gh;
618 bool need_unlock = false;
619 int ret;
620
621
622
623 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
624 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
625 if (ret)
626 return ret;
627 need_unlock = true;
628 }
629 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
630 if (need_unlock)
631 gfs2_glock_dq_uninit(&gh);
632 return ret;
633}
634
635
636
637
638
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641
642
643static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
644{
645 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
646 struct gfs2_ea_header *ea;
647 unsigned int n = 1;
648 u64 block;
649 int error;
650
651 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
652 if (error)
653 return error;
654 gfs2_trans_add_unrevoke(sdp, block, 1);
655 *bhp = gfs2_meta_new(ip->i_gl, block);
656 gfs2_trans_add_meta(ip->i_gl, *bhp);
657 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
658 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
659
660 ea = GFS2_EA_BH2FIRST(*bhp);
661 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
662 ea->ea_type = GFS2_EATYPE_UNUSED;
663 ea->ea_flags = GFS2_EAFLAG_LAST;
664 ea->ea_num_ptrs = 0;
665
666 gfs2_add_inode_blocks(&ip->i_inode, 1);
667
668 return 0;
669}
670
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673
674
675
676
677
678
679
680
681
682
683static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
684 struct gfs2_ea_request *er)
685{
686 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
687 int error;
688
689 ea->ea_data_len = cpu_to_be32(er->er_data_len);
690 ea->ea_name_len = er->er_name_len;
691 ea->ea_type = er->er_type;
692 ea->__pad = 0;
693
694 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
695
696 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
697 ea->ea_num_ptrs = 0;
698 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
699 } else {
700 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
701 const char *data = er->er_data;
702 unsigned int data_len = er->er_data_len;
703 unsigned int copy;
704 unsigned int x;
705
706 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
707 for (x = 0; x < ea->ea_num_ptrs; x++) {
708 struct buffer_head *bh;
709 u64 block;
710 int mh_size = sizeof(struct gfs2_meta_header);
711 unsigned int n = 1;
712
713 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
714 if (error)
715 return error;
716 gfs2_trans_add_unrevoke(sdp, block, 1);
717 bh = gfs2_meta_new(ip->i_gl, block);
718 gfs2_trans_add_meta(ip->i_gl, bh);
719 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
720
721 gfs2_add_inode_blocks(&ip->i_inode, 1);
722
723 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
724 data_len;
725 memcpy(bh->b_data + mh_size, data, copy);
726 if (copy < sdp->sd_jbsize)
727 memset(bh->b_data + mh_size + copy, 0,
728 sdp->sd_jbsize - copy);
729
730 *dataptr++ = cpu_to_be64(bh->b_blocknr);
731 data += copy;
732 data_len -= copy;
733
734 brelse(bh);
735 }
736
737 gfs2_assert_withdraw(sdp, !data_len);
738 }
739
740 return 0;
741}
742
743typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
744 struct gfs2_ea_request *er, void *private);
745
746static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
747 unsigned int blks,
748 ea_skeleton_call_t skeleton_call, void *private)
749{
750 struct gfs2_alloc_parms ap = { .target = blks };
751 struct buffer_head *dibh;
752 int error;
753
754 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
755 if (error)
756 return error;
757
758 error = gfs2_quota_lock_check(ip, &ap);
759 if (error)
760 return error;
761
762 error = gfs2_inplace_reserve(ip, &ap);
763 if (error)
764 goto out_gunlock_q;
765
766 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
767 blks + gfs2_rg_blocks(ip, blks) +
768 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
769 if (error)
770 goto out_ipres;
771
772 error = skeleton_call(ip, er, private);
773 if (error)
774 goto out_end_trans;
775
776 error = gfs2_meta_inode_buffer(ip, &dibh);
777 if (!error) {
778 ip->i_inode.i_ctime = current_time(&ip->i_inode);
779 gfs2_trans_add_meta(ip->i_gl, dibh);
780 gfs2_dinode_out(ip, dibh->b_data);
781 brelse(dibh);
782 }
783
784out_end_trans:
785 gfs2_trans_end(GFS2_SB(&ip->i_inode));
786out_ipres:
787 gfs2_inplace_release(ip);
788out_gunlock_q:
789 gfs2_quota_unlock(ip);
790 return error;
791}
792
793static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
794 void *private)
795{
796 struct buffer_head *bh;
797 int error;
798
799 error = ea_alloc_blk(ip, &bh);
800 if (error)
801 return error;
802
803 ip->i_eattr = bh->b_blocknr;
804 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
805
806 brelse(bh);
807
808 return error;
809}
810
811
812
813
814
815
816
817
818
819static int ea_init(struct gfs2_inode *ip, int type, const char *name,
820 const void *data, size_t size)
821{
822 struct gfs2_ea_request er;
823 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
824 unsigned int blks = 1;
825
826 er.er_type = type;
827 er.er_name = name;
828 er.er_name_len = strlen(name);
829 er.er_data = (void *)data;
830 er.er_data_len = size;
831
832 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
833 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
834
835 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
836}
837
838static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
839{
840 u32 ea_size = GFS2_EA_SIZE(ea);
841 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
842 ea_size);
843 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
844 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
845
846 ea->ea_rec_len = cpu_to_be32(ea_size);
847 ea->ea_flags ^= last;
848
849 new->ea_rec_len = cpu_to_be32(new_size);
850 new->ea_flags = last;
851
852 return new;
853}
854
855static void ea_set_remove_stuffed(struct gfs2_inode *ip,
856 struct gfs2_ea_location *el)
857{
858 struct gfs2_ea_header *ea = el->el_ea;
859 struct gfs2_ea_header *prev = el->el_prev;
860 u32 len;
861
862 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
863
864 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
865 ea->ea_type = GFS2_EATYPE_UNUSED;
866 return;
867 } else if (GFS2_EA2NEXT(prev) != ea) {
868 prev = GFS2_EA2NEXT(prev);
869 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
870 }
871
872 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
873 prev->ea_rec_len = cpu_to_be32(len);
874
875 if (GFS2_EA_IS_LAST(ea))
876 prev->ea_flags |= GFS2_EAFLAG_LAST;
877}
878
879struct ea_set {
880 int ea_split;
881
882 struct gfs2_ea_request *es_er;
883 struct gfs2_ea_location *es_el;
884
885 struct buffer_head *es_bh;
886 struct gfs2_ea_header *es_ea;
887};
888
889static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
890 struct gfs2_ea_header *ea, struct ea_set *es)
891{
892 struct gfs2_ea_request *er = es->es_er;
893 struct buffer_head *dibh;
894 int error;
895
896 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
897 if (error)
898 return error;
899
900 gfs2_trans_add_meta(ip->i_gl, bh);
901
902 if (es->ea_split)
903 ea = ea_split_ea(ea);
904
905 ea_write(ip, ea, er);
906
907 if (es->es_el)
908 ea_set_remove_stuffed(ip, es->es_el);
909
910 error = gfs2_meta_inode_buffer(ip, &dibh);
911 if (error)
912 goto out;
913 ip->i_inode.i_ctime = current_time(&ip->i_inode);
914 gfs2_trans_add_meta(ip->i_gl, dibh);
915 gfs2_dinode_out(ip, dibh->b_data);
916 brelse(dibh);
917out:
918 gfs2_trans_end(GFS2_SB(&ip->i_inode));
919 return error;
920}
921
922static int ea_set_simple_alloc(struct gfs2_inode *ip,
923 struct gfs2_ea_request *er, void *private)
924{
925 struct ea_set *es = private;
926 struct gfs2_ea_header *ea = es->es_ea;
927 int error;
928
929 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
930
931 if (es->ea_split)
932 ea = ea_split_ea(ea);
933
934 error = ea_write(ip, ea, er);
935 if (error)
936 return error;
937
938 if (es->es_el)
939 ea_set_remove_stuffed(ip, es->es_el);
940
941 return 0;
942}
943
944static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
945 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
946 void *private)
947{
948 struct ea_set *es = private;
949 unsigned int size;
950 int stuffed;
951 int error;
952
953 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
954 es->es_er->er_data_len, &size);
955
956 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
957 if (GFS2_EA_REC_LEN(ea) < size)
958 return 0;
959 if (!GFS2_EA_IS_STUFFED(ea)) {
960 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
961 if (error)
962 return error;
963 }
964 es->ea_split = 0;
965 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
966 es->ea_split = 1;
967 else
968 return 0;
969
970 if (stuffed) {
971 error = ea_set_simple_noalloc(ip, bh, ea, es);
972 if (error)
973 return error;
974 } else {
975 unsigned int blks;
976
977 es->es_bh = bh;
978 es->es_ea = ea;
979 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
980 GFS2_SB(&ip->i_inode)->sd_jbsize);
981
982 error = ea_alloc_skeleton(ip, es->es_er, blks,
983 ea_set_simple_alloc, es);
984 if (error)
985 return error;
986 }
987
988 return 1;
989}
990
991static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
992 void *private)
993{
994 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
995 struct buffer_head *indbh, *newbh;
996 __be64 *eablk;
997 int error;
998 int mh_size = sizeof(struct gfs2_meta_header);
999
1000 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1001 __be64 *end;
1002
1003 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
1004 &indbh);
1005 if (error)
1006 return error;
1007
1008 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1009 error = -EIO;
1010 goto out;
1011 }
1012
1013 eablk = (__be64 *)(indbh->b_data + mh_size);
1014 end = eablk + sdp->sd_inptrs;
1015
1016 for (; eablk < end; eablk++)
1017 if (!*eablk)
1018 break;
1019
1020 if (eablk == end) {
1021 error = -ENOSPC;
1022 goto out;
1023 }
1024
1025 gfs2_trans_add_meta(ip->i_gl, indbh);
1026 } else {
1027 u64 blk;
1028 unsigned int n = 1;
1029 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1030 if (error)
1031 return error;
1032 gfs2_trans_add_unrevoke(sdp, blk, 1);
1033 indbh = gfs2_meta_new(ip->i_gl, blk);
1034 gfs2_trans_add_meta(ip->i_gl, indbh);
1035 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1036 gfs2_buffer_clear_tail(indbh, mh_size);
1037
1038 eablk = (__be64 *)(indbh->b_data + mh_size);
1039 *eablk = cpu_to_be64(ip->i_eattr);
1040 ip->i_eattr = blk;
1041 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1042 gfs2_add_inode_blocks(&ip->i_inode, 1);
1043
1044 eablk++;
1045 }
1046
1047 error = ea_alloc_blk(ip, &newbh);
1048 if (error)
1049 goto out;
1050
1051 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1052 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1053 brelse(newbh);
1054 if (error)
1055 goto out;
1056
1057 if (private)
1058 ea_set_remove_stuffed(ip, private);
1059
1060out:
1061 brelse(indbh);
1062 return error;
1063}
1064
1065static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1066 const void *value, size_t size, struct gfs2_ea_location *el)
1067{
1068 struct gfs2_ea_request er;
1069 struct ea_set es;
1070 unsigned int blks = 2;
1071 int error;
1072
1073 er.er_type = type;
1074 er.er_name = name;
1075 er.er_data = (void *)value;
1076 er.er_name_len = strlen(name);
1077 er.er_data_len = size;
1078
1079 memset(&es, 0, sizeof(struct ea_set));
1080 es.es_er = &er;
1081 es.es_el = el;
1082
1083 error = ea_foreach(ip, ea_set_simple, &es);
1084 if (error > 0)
1085 return 0;
1086 if (error)
1087 return error;
1088
1089 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1090 blks++;
1091 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1092 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1093
1094 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1095}
1096
1097static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1098 struct gfs2_ea_location *el)
1099{
1100 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1101 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1102 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1103 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1104 }
1105
1106 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1107}
1108
1109static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1110{
1111 struct gfs2_ea_header *ea = el->el_ea;
1112 struct gfs2_ea_header *prev = el->el_prev;
1113 struct buffer_head *dibh;
1114 int error;
1115
1116 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1117 if (error)
1118 return error;
1119
1120 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1121
1122 if (prev) {
1123 u32 len;
1124
1125 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1126 prev->ea_rec_len = cpu_to_be32(len);
1127
1128 if (GFS2_EA_IS_LAST(ea))
1129 prev->ea_flags |= GFS2_EAFLAG_LAST;
1130 } else {
1131 ea->ea_type = GFS2_EATYPE_UNUSED;
1132 }
1133
1134 error = gfs2_meta_inode_buffer(ip, &dibh);
1135 if (!error) {
1136 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1137 gfs2_trans_add_meta(ip->i_gl, dibh);
1138 gfs2_dinode_out(ip, dibh->b_data);
1139 brelse(dibh);
1140 }
1141
1142 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1143
1144 return error;
1145}
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1161{
1162 struct gfs2_ea_location el;
1163 int error;
1164
1165 if (!ip->i_eattr)
1166 return -ENODATA;
1167
1168 error = gfs2_ea_find(ip, type, name, &el);
1169 if (error)
1170 return error;
1171 if (!el.el_ea)
1172 return -ENODATA;
1173
1174 if (GFS2_EA_IS_STUFFED(el.el_ea))
1175 error = ea_remove_stuffed(ip, &el);
1176 else
1177 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1178
1179 brelse(el.el_bh);
1180
1181 return error;
1182}
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198int __gfs2_xattr_set(struct inode *inode, const char *name,
1199 const void *value, size_t size, int flags, int type)
1200{
1201 struct gfs2_inode *ip = GFS2_I(inode);
1202 struct gfs2_sbd *sdp = GFS2_SB(inode);
1203 struct gfs2_ea_location el;
1204 unsigned int namel = strlen(name);
1205 int error;
1206
1207 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1208 return -EPERM;
1209 if (namel > GFS2_EA_MAX_NAME_LEN)
1210 return -ERANGE;
1211
1212 if (value == NULL)
1213 return gfs2_xattr_remove(ip, type, name);
1214
1215 if (ea_check_size(sdp, namel, size))
1216 return -ERANGE;
1217
1218 if (!ip->i_eattr) {
1219 if (flags & XATTR_REPLACE)
1220 return -ENODATA;
1221 return ea_init(ip, type, name, value, size);
1222 }
1223
1224 error = gfs2_ea_find(ip, type, name, &el);
1225 if (error)
1226 return error;
1227
1228 if (el.el_ea) {
1229 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1230 brelse(el.el_bh);
1231 return -EPERM;
1232 }
1233
1234 error = -EEXIST;
1235 if (!(flags & XATTR_CREATE)) {
1236 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1237 error = ea_set_i(ip, type, name, value, size, &el);
1238 if (!error && unstuffed)
1239 ea_set_remove_unstuffed(ip, &el);
1240 }
1241
1242 brelse(el.el_bh);
1243 return error;
1244 }
1245
1246 error = -ENODATA;
1247 if (!(flags & XATTR_REPLACE))
1248 error = ea_set_i(ip, type, name, value, size, NULL);
1249
1250 return error;
1251}
1252
1253static int gfs2_xattr_set(const struct xattr_handler *handler,
1254 struct dentry *unused, struct inode *inode,
1255 const char *name, const void *value,
1256 size_t size, int flags)
1257{
1258 struct gfs2_inode *ip = GFS2_I(inode);
1259 struct gfs2_holder gh;
1260 int ret;
1261
1262 ret = gfs2_rsqa_alloc(ip);
1263 if (ret)
1264 return ret;
1265
1266 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1267 if (ret)
1268 return ret;
1269 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1270 gfs2_glock_dq_uninit(&gh);
1271 return ret;
1272}
1273
1274static int ea_dealloc_indirect(struct gfs2_inode *ip)
1275{
1276 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1277 struct gfs2_rgrp_list rlist;
1278 struct buffer_head *indbh, *dibh;
1279 __be64 *eablk, *end;
1280 unsigned int rg_blocks = 0;
1281 u64 bstart = 0;
1282 unsigned int blen = 0;
1283 unsigned int blks = 0;
1284 unsigned int x;
1285 int error;
1286
1287 error = gfs2_rindex_update(sdp);
1288 if (error)
1289 return error;
1290
1291 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1292
1293 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1294 if (error)
1295 return error;
1296
1297 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1298 error = -EIO;
1299 goto out;
1300 }
1301
1302 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1303 end = eablk + sdp->sd_inptrs;
1304
1305 for (; eablk < end; eablk++) {
1306 u64 bn;
1307
1308 if (!*eablk)
1309 break;
1310 bn = be64_to_cpu(*eablk);
1311
1312 if (bstart + blen == bn)
1313 blen++;
1314 else {
1315 if (bstart)
1316 gfs2_rlist_add(ip, &rlist, bstart);
1317 bstart = bn;
1318 blen = 1;
1319 }
1320 blks++;
1321 }
1322 if (bstart)
1323 gfs2_rlist_add(ip, &rlist, bstart);
1324 else
1325 goto out;
1326
1327 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1328
1329 for (x = 0; x < rlist.rl_rgrps; x++) {
1330 struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1331
1332 rg_blocks += rgd->rd_length;
1333 }
1334
1335 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1336 if (error)
1337 goto out_rlist_free;
1338
1339 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1340 RES_STATFS + RES_QUOTA, blks);
1341 if (error)
1342 goto out_gunlock;
1343
1344 gfs2_trans_add_meta(ip->i_gl, indbh);
1345
1346 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1347 bstart = 0;
1348 blen = 0;
1349
1350 for (; eablk < end; eablk++) {
1351 u64 bn;
1352
1353 if (!*eablk)
1354 break;
1355 bn = be64_to_cpu(*eablk);
1356
1357 if (bstart + blen == bn)
1358 blen++;
1359 else {
1360 if (bstart)
1361 gfs2_free_meta(ip, bstart, blen);
1362 bstart = bn;
1363 blen = 1;
1364 }
1365
1366 *eablk = 0;
1367 gfs2_add_inode_blocks(&ip->i_inode, -1);
1368 }
1369 if (bstart)
1370 gfs2_free_meta(ip, bstart, blen);
1371
1372 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1373
1374 error = gfs2_meta_inode_buffer(ip, &dibh);
1375 if (!error) {
1376 gfs2_trans_add_meta(ip->i_gl, dibh);
1377 gfs2_dinode_out(ip, dibh->b_data);
1378 brelse(dibh);
1379 }
1380
1381 gfs2_trans_end(sdp);
1382
1383out_gunlock:
1384 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385out_rlist_free:
1386 gfs2_rlist_free(&rlist);
1387out:
1388 brelse(indbh);
1389 return error;
1390}
1391
1392static int ea_dealloc_block(struct gfs2_inode *ip)
1393{
1394 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1395 struct gfs2_rgrpd *rgd;
1396 struct buffer_head *dibh;
1397 struct gfs2_holder gh;
1398 int error;
1399
1400 error = gfs2_rindex_update(sdp);
1401 if (error)
1402 return error;
1403
1404 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1405 if (!rgd) {
1406 gfs2_consist_inode(ip);
1407 return -EIO;
1408 }
1409
1410 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1411 if (error)
1412 return error;
1413
1414 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1415 RES_QUOTA, 1);
1416 if (error)
1417 goto out_gunlock;
1418
1419 gfs2_free_meta(ip, ip->i_eattr, 1);
1420
1421 ip->i_eattr = 0;
1422 gfs2_add_inode_blocks(&ip->i_inode, -1);
1423
1424 error = gfs2_meta_inode_buffer(ip, &dibh);
1425 if (!error) {
1426 gfs2_trans_add_meta(ip->i_gl, dibh);
1427 gfs2_dinode_out(ip, dibh->b_data);
1428 brelse(dibh);
1429 }
1430
1431 gfs2_trans_end(sdp);
1432
1433out_gunlock:
1434 gfs2_glock_dq_uninit(&gh);
1435 return error;
1436}
1437
1438
1439
1440
1441
1442
1443
1444
1445int gfs2_ea_dealloc(struct gfs2_inode *ip)
1446{
1447 int error;
1448
1449 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1450 if (error)
1451 return error;
1452
1453 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1454 if (error)
1455 return error;
1456
1457 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1458 if (error)
1459 goto out_quota;
1460
1461 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1462 error = ea_dealloc_indirect(ip);
1463 if (error)
1464 goto out_quota;
1465 }
1466
1467 error = ea_dealloc_block(ip);
1468
1469out_quota:
1470 gfs2_quota_unhold(ip);
1471 return error;
1472}
1473
1474static const struct xattr_handler gfs2_xattr_user_handler = {
1475 .prefix = XATTR_USER_PREFIX,
1476 .flags = GFS2_EATYPE_USR,
1477 .get = gfs2_xattr_get,
1478 .set = gfs2_xattr_set,
1479};
1480
1481static const struct xattr_handler gfs2_xattr_security_handler = {
1482 .prefix = XATTR_SECURITY_PREFIX,
1483 .flags = GFS2_EATYPE_SECURITY,
1484 .get = gfs2_xattr_get,
1485 .set = gfs2_xattr_set,
1486};
1487
1488const struct xattr_handler *gfs2_xattr_handlers[] = {
1489 &gfs2_xattr_user_handler,
1490 &gfs2_xattr_security_handler,
1491 &posix_acl_access_xattr_handler,
1492 &posix_acl_default_xattr_handler,
1493 NULL,
1494};
1495
1496
