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1/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
4 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
7 * of the GNU General Public License version 2.
8 */
9
10#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/xattr.h>
15#include <linux/gfs2_ondisk.h>
16#include <asm/uaccess.h>
17
18#include "gfs2.h"
19#include "incore.h"
20#include "acl.h"
21#include "xattr.h"
22#include "glock.h"
23#include "inode.h"
24#include "meta_io.h"
25#include "quota.h"
26#include "rgrp.h"
27#include "trans.h"
28#include "util.h"
29
30/**
31 * ea_calc_size - returns the acutal number of bytes the request will take up
32 * (not counting any unstuffed data blocks)
33 * @sdp:
34 * @er:
35 * @size:
36 *
37 * Returns: 1 if the EA should be stuffed
38 */
39
40static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
41 unsigned int *size)
42{
43 unsigned int jbsize = sdp->sd_jbsize;
44
45 /* Stuffed */
46 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
47
48 if (*size <= jbsize)
49 return 1;
50
51 /* Unstuffed */
52 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
53 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
54
55 return 0;
56}
57
58static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
59{
60 unsigned int size;
61
62 if (dsize > GFS2_EA_MAX_DATA_LEN)
63 return -ERANGE;
64
65 ea_calc_size(sdp, nsize, dsize, &size);
66
67 /* This can only happen with 512 byte blocks */
68 if (size > sdp->sd_jbsize)
69 return -ERANGE;
70
71 return 0;
72}
73
74typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
75 struct gfs2_ea_header *ea,
76 struct gfs2_ea_header *prev, void *private);
77
78static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
79 ea_call_t ea_call, void *data)
80{
81 struct gfs2_ea_header *ea, *prev = NULL;
82 int error = 0;
83
84 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
85 return -EIO;
86
87 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
88 if (!GFS2_EA_REC_LEN(ea))
89 goto fail;
90 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
91 bh->b_data + bh->b_size))
92 goto fail;
93 if (!GFS2_EATYPE_VALID(ea->ea_type))
94 goto fail;
95
96 error = ea_call(ip, bh, ea, prev, data);
97 if (error)
98 return error;
99
100 if (GFS2_EA_IS_LAST(ea)) {
101 if ((char *)GFS2_EA2NEXT(ea) !=
102 bh->b_data + bh->b_size)
103 goto fail;
104 break;
105 }
106 }
107
108 return error;
109
110fail:
111 gfs2_consist_inode(ip);
112 return -EIO;
113}
114
115static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
116{
117 struct buffer_head *bh, *eabh;
118 __be64 *eablk, *end;
119 int error;
120
121 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
122 if (error)
123 return error;
124
125 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
126 error = ea_foreach_i(ip, bh, ea_call, data);
127 goto out;
128 }
129
130 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
131 error = -EIO;
132 goto out;
133 }
134
135 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
136 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
137
138 for (; eablk < end; eablk++) {
139 u64 bn;
140
141 if (!*eablk)
142 break;
143 bn = be64_to_cpu(*eablk);
144
145 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
146 if (error)
147 break;
148 error = ea_foreach_i(ip, eabh, ea_call, data);
149 brelse(eabh);
150 if (error)
151 break;
152 }
153out:
154 brelse(bh);
155 return error;
156}
157
158struct ea_find {
159 int type;
160 const char *name;
161 size_t namel;
162 struct gfs2_ea_location *ef_el;
163};
164
165static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
166 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
167 void *private)
168{
169 struct ea_find *ef = private;
170
171 if (ea->ea_type == GFS2_EATYPE_UNUSED)
172 return 0;
173
174 if (ea->ea_type == ef->type) {
175 if (ea->ea_name_len == ef->namel &&
176 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
177 struct gfs2_ea_location *el = ef->ef_el;
178 get_bh(bh);
179 el->el_bh = bh;
180 el->el_ea = ea;
181 el->el_prev = prev;
182 return 1;
183 }
184 }
185
186 return 0;
187}
188
189static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
190 struct gfs2_ea_location *el)
191{
192 struct ea_find ef;
193 int error;
194
195 ef.type = type;
196 ef.name = name;
197 ef.namel = strlen(name);
198 ef.ef_el = el;
199
200 memset(el, 0, sizeof(struct gfs2_ea_location));
201
202 error = ea_foreach(ip, ea_find_i, &ef);
203 if (error > 0)
204 return 0;
205
206 return error;
207}
208
209/**
210 * ea_dealloc_unstuffed -
211 * @ip:
212 * @bh:
213 * @ea:
214 * @prev:
215 * @private:
216 *
217 * Take advantage of the fact that all unstuffed blocks are
218 * allocated from the same RG. But watch, this may not always
219 * be true.
220 *
221 * Returns: errno
222 */
223
224static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
225 struct gfs2_ea_header *ea,
226 struct gfs2_ea_header *prev, void *private)
227{
228 int *leave = private;
229 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
230 struct gfs2_rgrpd *rgd;
231 struct gfs2_holder rg_gh;
232 struct buffer_head *dibh;
233 __be64 *dataptrs;
234 u64 bn = 0;
235 u64 bstart = 0;
236 unsigned int blen = 0;
237 unsigned int blks = 0;
238 unsigned int x;
239 int error;
240
241 if (GFS2_EA_IS_STUFFED(ea))
242 return 0;
243
244 dataptrs = GFS2_EA2DATAPTRS(ea);
245 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
246 if (*dataptrs) {
247 blks++;
248 bn = be64_to_cpu(*dataptrs);
249 }
250 }
251 if (!blks)
252 return 0;
253
254 rgd = gfs2_blk2rgrpd(sdp, bn);
255 if (!rgd) {
256 gfs2_consist_inode(ip);
257 return -EIO;
258 }
259
260 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
261 if (error)
262 return error;
263
264 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
265 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
266 if (error)
267 goto out_gunlock;
268
269 gfs2_trans_add_bh(ip->i_gl, bh, 1);
270
271 dataptrs = GFS2_EA2DATAPTRS(ea);
272 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
273 if (!*dataptrs)
274 break;
275 bn = be64_to_cpu(*dataptrs);
276
277 if (bstart + blen == bn)
278 blen++;
279 else {
280 if (bstart)
281 gfs2_free_meta(ip, bstart, blen);
282 bstart = bn;
283 blen = 1;
284 }
285
286 *dataptrs = 0;
287 gfs2_add_inode_blocks(&ip->i_inode, -1);
288 }
289 if (bstart)
290 gfs2_free_meta(ip, bstart, blen);
291
292 if (prev && !leave) {
293 u32 len;
294
295 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
296 prev->ea_rec_len = cpu_to_be32(len);
297
298 if (GFS2_EA_IS_LAST(ea))
299 prev->ea_flags |= GFS2_EAFLAG_LAST;
300 } else {
301 ea->ea_type = GFS2_EATYPE_UNUSED;
302 ea->ea_num_ptrs = 0;
303 }
304
305 error = gfs2_meta_inode_buffer(ip, &dibh);
306 if (!error) {
307 ip->i_inode.i_ctime = CURRENT_TIME;
308 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
309 gfs2_dinode_out(ip, dibh->b_data);
310 brelse(dibh);
311 }
312
313 gfs2_trans_end(sdp);
314
315out_gunlock:
316 gfs2_glock_dq_uninit(&rg_gh);
317 return error;
318}
319
320static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
321 struct gfs2_ea_header *ea,
322 struct gfs2_ea_header *prev, int leave)
323{
324 struct gfs2_alloc *al;
325 int error;
326
327 al = gfs2_alloc_get(ip);
328 if (!al)
329 return -ENOMEM;
330
331 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
332 if (error)
333 goto out_alloc;
334
335 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
336 if (error)
337 goto out_quota;
338
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340
341 gfs2_glock_dq_uninit(&al->al_ri_gh);
342
343out_quota:
344 gfs2_quota_unhold(ip);
345out_alloc:
346 gfs2_alloc_put(ip);
347 return error;
348}
349
350struct ea_list {
351 struct gfs2_ea_request *ei_er;
352 unsigned int ei_size;
353};
354
355static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
356{
357 switch (ea->ea_type) {
358 case GFS2_EATYPE_USR:
359 return 5 + ea->ea_name_len + 1;
360 case GFS2_EATYPE_SYS:
361 return 7 + ea->ea_name_len + 1;
362 case GFS2_EATYPE_SECURITY:
363 return 9 + ea->ea_name_len + 1;
364 default:
365 return 0;
366 }
367}
368
369static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
370 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
371 void *private)
372{
373 struct ea_list *ei = private;
374 struct gfs2_ea_request *er = ei->ei_er;
375 unsigned int ea_size = gfs2_ea_strlen(ea);
376
377 if (ea->ea_type == GFS2_EATYPE_UNUSED)
378 return 0;
379
380 if (er->er_data_len) {
381 char *prefix = NULL;
382 unsigned int l = 0;
383 char c = 0;
384
385 if (ei->ei_size + ea_size > er->er_data_len)
386 return -ERANGE;
387
388 switch (ea->ea_type) {
389 case GFS2_EATYPE_USR:
390 prefix = "user.";
391 l = 5;
392 break;
393 case GFS2_EATYPE_SYS:
394 prefix = "system.";
395 l = 7;
396 break;
397 case GFS2_EATYPE_SECURITY:
398 prefix = "security.";
399 l = 9;
400 break;
401 }
402
403 BUG_ON(l == 0);
404
405 memcpy(er->er_data + ei->ei_size, prefix, l);
406 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
407 ea->ea_name_len);
408 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
409 }
410
411 ei->ei_size += ea_size;
412
413 return 0;
414}
415
416/**
417 * gfs2_listxattr - List gfs2 extended attributes
418 * @dentry: The dentry whose inode we are interested in
419 * @buffer: The buffer to write the results
420 * @size: The size of the buffer
421 *
422 * Returns: actual size of data on success, -errno on error
423 */
424
425ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
426{
427 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
428 struct gfs2_ea_request er;
429 struct gfs2_holder i_gh;
430 int error;
431
432 memset(&er, 0, sizeof(struct gfs2_ea_request));
433 if (size) {
434 er.er_data = buffer;
435 er.er_data_len = size;
436 }
437
438 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
439 if (error)
440 return error;
441
442 if (ip->i_eattr) {
443 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
444
445 error = ea_foreach(ip, ea_list_i, &ei);
446 if (!error)
447 error = ei.ei_size;
448 }
449
450 gfs2_glock_dq_uninit(&i_gh);
451
452 return error;
453}
454
455/**
456 * ea_get_unstuffed - actually copies the unstuffed data into the
457 * request buffer
458 * @ip: The GFS2 inode
459 * @ea: The extended attribute header structure
460 * @data: The data to be copied
461 *
462 * Returns: errno
463 */
464
465static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
466 char *data)
467{
468 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
469 struct buffer_head **bh;
470 unsigned int amount = GFS2_EA_DATA_LEN(ea);
471 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
472 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
473 unsigned int x;
474 int error = 0;
475
476 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
477 if (!bh)
478 return -ENOMEM;
479
480 for (x = 0; x < nptrs; x++) {
481 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
482 bh + x);
483 if (error) {
484 while (x--)
485 brelse(bh[x]);
486 goto out;
487 }
488 dataptrs++;
489 }
490
491 for (x = 0; x < nptrs; x++) {
492 error = gfs2_meta_wait(sdp, bh[x]);
493 if (error) {
494 for (; x < nptrs; x++)
495 brelse(bh[x]);
496 goto out;
497 }
498 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
499 for (; x < nptrs; x++)
500 brelse(bh[x]);
501 error = -EIO;
502 goto out;
503 }
504
505 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
506 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
507
508 amount -= sdp->sd_jbsize;
509 data += sdp->sd_jbsize;
510
511 brelse(bh[x]);
512 }
513
514out:
515 kfree(bh);
516 return error;
517}
518
519static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
520 char *data, size_t size)
521{
522 int ret;
523 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
524 if (len > size)
525 return -ERANGE;
526
527 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
528 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
529 return len;
530 }
531 ret = ea_get_unstuffed(ip, el->el_ea, data);
532 if (ret < 0)
533 return ret;
534 return len;
535}
536
537int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
538{
539 struct gfs2_ea_location el;
540 int error;
541 int len;
542 char *data;
543
544 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
545 if (error)
546 return error;
547 if (!el.el_ea)
548 goto out;
549 if (!GFS2_EA_DATA_LEN(el.el_ea))
550 goto out;
551
552 len = GFS2_EA_DATA_LEN(el.el_ea);
553 data = kmalloc(len, GFP_NOFS);
554 error = -ENOMEM;
555 if (data == NULL)
556 goto out;
557
558 error = gfs2_ea_get_copy(ip, &el, data, len);
559 if (error == 0)
560 error = len;
561 *ppdata = data;
562out:
563 brelse(el.el_bh);
564 return error;
565}
566
567/**
568 * gfs2_xattr_get - Get a GFS2 extended attribute
569 * @inode: The inode
570 * @name: The name of the extended attribute
571 * @buffer: The buffer to write the result into
572 * @size: The size of the buffer
573 * @type: The type of extended attribute
574 *
575 * Returns: actual size of data on success, -errno on error
576 */
577static int gfs2_xattr_get(struct dentry *dentry, const char *name,
578 void *buffer, size_t size, int type)
579{
580 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
581 struct gfs2_ea_location el;
582 int error;
583
584 if (!ip->i_eattr)
585 return -ENODATA;
586 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
587 return -EINVAL;
588
589 error = gfs2_ea_find(ip, type, name, &el);
590 if (error)
591 return error;
592 if (!el.el_ea)
593 return -ENODATA;
594 if (size)
595 error = gfs2_ea_get_copy(ip, &el, buffer, size);
596 else
597 error = GFS2_EA_DATA_LEN(el.el_ea);
598 brelse(el.el_bh);
599
600 return error;
601}
602
603/**
604 * ea_alloc_blk - allocates a new block for extended attributes.
605 * @ip: A pointer to the inode that's getting extended attributes
606 * @bhp: Pointer to pointer to a struct buffer_head
607 *
608 * Returns: errno
609 */
610
611static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
612{
613 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
614 struct gfs2_ea_header *ea;
615 unsigned int n = 1;
616 u64 block;
617 int error;
618
619 error = gfs2_alloc_block(ip, &block, &n);
620 if (error)
621 return error;
622 gfs2_trans_add_unrevoke(sdp, block, 1);
623 *bhp = gfs2_meta_new(ip->i_gl, block);
624 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
625 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
626 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
627
628 ea = GFS2_EA_BH2FIRST(*bhp);
629 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
630 ea->ea_type = GFS2_EATYPE_UNUSED;
631 ea->ea_flags = GFS2_EAFLAG_LAST;
632 ea->ea_num_ptrs = 0;
633
634 gfs2_add_inode_blocks(&ip->i_inode, 1);
635
636 return 0;
637}
638
639/**
640 * ea_write - writes the request info to an ea, creating new blocks if
641 * necessary
642 * @ip: inode that is being modified
643 * @ea: the location of the new ea in a block
644 * @er: the write request
645 *
646 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
647 *
648 * returns : errno
649 */
650
651static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
652 struct gfs2_ea_request *er)
653{
654 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
655 int error;
656
657 ea->ea_data_len = cpu_to_be32(er->er_data_len);
658 ea->ea_name_len = er->er_name_len;
659 ea->ea_type = er->er_type;
660 ea->__pad = 0;
661
662 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
663
664 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
665 ea->ea_num_ptrs = 0;
666 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
667 } else {
668 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
669 const char *data = er->er_data;
670 unsigned int data_len = er->er_data_len;
671 unsigned int copy;
672 unsigned int x;
673
674 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
675 for (x = 0; x < ea->ea_num_ptrs; x++) {
676 struct buffer_head *bh;
677 u64 block;
678 int mh_size = sizeof(struct gfs2_meta_header);
679 unsigned int n = 1;
680
681 error = gfs2_alloc_block(ip, &block, &n);
682 if (error)
683 return error;
684 gfs2_trans_add_unrevoke(sdp, block, 1);
685 bh = gfs2_meta_new(ip->i_gl, block);
686 gfs2_trans_add_bh(ip->i_gl, bh, 1);
687 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
688
689 gfs2_add_inode_blocks(&ip->i_inode, 1);
690
691 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
692 data_len;
693 memcpy(bh->b_data + mh_size, data, copy);
694 if (copy < sdp->sd_jbsize)
695 memset(bh->b_data + mh_size + copy, 0,
696 sdp->sd_jbsize - copy);
697
698 *dataptr++ = cpu_to_be64(bh->b_blocknr);
699 data += copy;
700 data_len -= copy;
701
702 brelse(bh);
703 }
704
705 gfs2_assert_withdraw(sdp, !data_len);
706 }
707
708 return 0;
709}
710
711typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
712 struct gfs2_ea_request *er, void *private);
713
714static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
715 unsigned int blks,
716 ea_skeleton_call_t skeleton_call, void *private)
717{
718 struct gfs2_alloc *al;
719 struct buffer_head *dibh;
720 int error;
721
722 al = gfs2_alloc_get(ip);
723 if (!al)
724 return -ENOMEM;
725
726 error = gfs2_quota_lock_check(ip);
727 if (error)
728 goto out;
729
730 al->al_requested = blks;
731
732 error = gfs2_inplace_reserve(ip);
733 if (error)
734 goto out_gunlock_q;
735
736 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
737 blks + gfs2_rg_blocks(al) +
738 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
739 if (error)
740 goto out_ipres;
741
742 error = skeleton_call(ip, er, private);
743 if (error)
744 goto out_end_trans;
745
746 error = gfs2_meta_inode_buffer(ip, &dibh);
747 if (!error) {
748 ip->i_inode.i_ctime = CURRENT_TIME;
749 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
750 gfs2_dinode_out(ip, dibh->b_data);
751 brelse(dibh);
752 }
753
754out_end_trans:
755 gfs2_trans_end(GFS2_SB(&ip->i_inode));
756out_ipres:
757 gfs2_inplace_release(ip);
758out_gunlock_q:
759 gfs2_quota_unlock(ip);
760out:
761 gfs2_alloc_put(ip);
762 return error;
763}
764
765static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
766 void *private)
767{
768 struct buffer_head *bh;
769 int error;
770
771 error = ea_alloc_blk(ip, &bh);
772 if (error)
773 return error;
774
775 ip->i_eattr = bh->b_blocknr;
776 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
777
778 brelse(bh);
779
780 return error;
781}
782
783/**
784 * ea_init - initializes a new eattr block
785 * @ip:
786 * @er:
787 *
788 * Returns: errno
789 */
790
791static int ea_init(struct gfs2_inode *ip, int type, const char *name,
792 const void *data, size_t size)
793{
794 struct gfs2_ea_request er;
795 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
796 unsigned int blks = 1;
797
798 er.er_type = type;
799 er.er_name = name;
800 er.er_name_len = strlen(name);
801 er.er_data = (void *)data;
802 er.er_data_len = size;
803
804 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
805 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
806
807 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
808}
809
810static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
811{
812 u32 ea_size = GFS2_EA_SIZE(ea);
813 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
814 ea_size);
815 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
816 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
817
818 ea->ea_rec_len = cpu_to_be32(ea_size);
819 ea->ea_flags ^= last;
820
821 new->ea_rec_len = cpu_to_be32(new_size);
822 new->ea_flags = last;
823
824 return new;
825}
826
827static void ea_set_remove_stuffed(struct gfs2_inode *ip,
828 struct gfs2_ea_location *el)
829{
830 struct gfs2_ea_header *ea = el->el_ea;
831 struct gfs2_ea_header *prev = el->el_prev;
832 u32 len;
833
834 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
835
836 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
837 ea->ea_type = GFS2_EATYPE_UNUSED;
838 return;
839 } else if (GFS2_EA2NEXT(prev) != ea) {
840 prev = GFS2_EA2NEXT(prev);
841 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
842 }
843
844 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
845 prev->ea_rec_len = cpu_to_be32(len);
846
847 if (GFS2_EA_IS_LAST(ea))
848 prev->ea_flags |= GFS2_EAFLAG_LAST;
849}
850
851struct ea_set {
852 int ea_split;
853
854 struct gfs2_ea_request *es_er;
855 struct gfs2_ea_location *es_el;
856
857 struct buffer_head *es_bh;
858 struct gfs2_ea_header *es_ea;
859};
860
861static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
862 struct gfs2_ea_header *ea, struct ea_set *es)
863{
864 struct gfs2_ea_request *er = es->es_er;
865 struct buffer_head *dibh;
866 int error;
867
868 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
869 if (error)
870 return error;
871
872 gfs2_trans_add_bh(ip->i_gl, bh, 1);
873
874 if (es->ea_split)
875 ea = ea_split_ea(ea);
876
877 ea_write(ip, ea, er);
878
879 if (es->es_el)
880 ea_set_remove_stuffed(ip, es->es_el);
881
882 error = gfs2_meta_inode_buffer(ip, &dibh);
883 if (error)
884 goto out;
885 ip->i_inode.i_ctime = CURRENT_TIME;
886 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
887 gfs2_dinode_out(ip, dibh->b_data);
888 brelse(dibh);
889out:
890 gfs2_trans_end(GFS2_SB(&ip->i_inode));
891 return error;
892}
893
894static int ea_set_simple_alloc(struct gfs2_inode *ip,
895 struct gfs2_ea_request *er, void *private)
896{
897 struct ea_set *es = private;
898 struct gfs2_ea_header *ea = es->es_ea;
899 int error;
900
901 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
902
903 if (es->ea_split)
904 ea = ea_split_ea(ea);
905
906 error = ea_write(ip, ea, er);
907 if (error)
908 return error;
909
910 if (es->es_el)
911 ea_set_remove_stuffed(ip, es->es_el);
912
913 return 0;
914}
915
916static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
917 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
918 void *private)
919{
920 struct ea_set *es = private;
921 unsigned int size;
922 int stuffed;
923 int error;
924
925 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
926 es->es_er->er_data_len, &size);
927
928 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
929 if (GFS2_EA_REC_LEN(ea) < size)
930 return 0;
931 if (!GFS2_EA_IS_STUFFED(ea)) {
932 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
933 if (error)
934 return error;
935 }
936 es->ea_split = 0;
937 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
938 es->ea_split = 1;
939 else
940 return 0;
941
942 if (stuffed) {
943 error = ea_set_simple_noalloc(ip, bh, ea, es);
944 if (error)
945 return error;
946 } else {
947 unsigned int blks;
948
949 es->es_bh = bh;
950 es->es_ea = ea;
951 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
952 GFS2_SB(&ip->i_inode)->sd_jbsize);
953
954 error = ea_alloc_skeleton(ip, es->es_er, blks,
955 ea_set_simple_alloc, es);
956 if (error)
957 return error;
958 }
959
960 return 1;
961}
962
963static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
964 void *private)
965{
966 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
967 struct buffer_head *indbh, *newbh;
968 __be64 *eablk;
969 int error;
970 int mh_size = sizeof(struct gfs2_meta_header);
971
972 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
973 __be64 *end;
974
975 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
976 &indbh);
977 if (error)
978 return error;
979
980 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
981 error = -EIO;
982 goto out;
983 }
984
985 eablk = (__be64 *)(indbh->b_data + mh_size);
986 end = eablk + sdp->sd_inptrs;
987
988 for (; eablk < end; eablk++)
989 if (!*eablk)
990 break;
991
992 if (eablk == end) {
993 error = -ENOSPC;
994 goto out;
995 }
996
997 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
998 } else {
999 u64 blk;
1000 unsigned int n = 1;
1001 error = gfs2_alloc_block(ip, &blk, &n);
1002 if (error)
1003 return error;
1004 gfs2_trans_add_unrevoke(sdp, blk, 1);
1005 indbh = gfs2_meta_new(ip->i_gl, blk);
1006 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1007 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1008 gfs2_buffer_clear_tail(indbh, mh_size);
1009
1010 eablk = (__be64 *)(indbh->b_data + mh_size);
1011 *eablk = cpu_to_be64(ip->i_eattr);
1012 ip->i_eattr = blk;
1013 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1014 gfs2_add_inode_blocks(&ip->i_inode, 1);
1015
1016 eablk++;
1017 }
1018
1019 error = ea_alloc_blk(ip, &newbh);
1020 if (error)
1021 goto out;
1022
1023 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1024 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1025 brelse(newbh);
1026 if (error)
1027 goto out;
1028
1029 if (private)
1030 ea_set_remove_stuffed(ip, private);
1031
1032out:
1033 brelse(indbh);
1034 return error;
1035}
1036
1037static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1038 const void *value, size_t size, struct gfs2_ea_location *el)
1039{
1040 struct gfs2_ea_request er;
1041 struct ea_set es;
1042 unsigned int blks = 2;
1043 int error;
1044
1045 er.er_type = type;
1046 er.er_name = name;
1047 er.er_data = (void *)value;
1048 er.er_name_len = strlen(name);
1049 er.er_data_len = size;
1050
1051 memset(&es, 0, sizeof(struct ea_set));
1052 es.es_er = &er;
1053 es.es_el = el;
1054
1055 error = ea_foreach(ip, ea_set_simple, &es);
1056 if (error > 0)
1057 return 0;
1058 if (error)
1059 return error;
1060
1061 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1062 blks++;
1063 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1064 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1065
1066 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1067}
1068
1069static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1070 struct gfs2_ea_location *el)
1071{
1072 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1073 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1074 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1075 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1076 }
1077
1078 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1079}
1080
1081static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1082{
1083 struct gfs2_ea_header *ea = el->el_ea;
1084 struct gfs2_ea_header *prev = el->el_prev;
1085 struct buffer_head *dibh;
1086 int error;
1087
1088 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1089 if (error)
1090 return error;
1091
1092 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1093
1094 if (prev) {
1095 u32 len;
1096
1097 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1098 prev->ea_rec_len = cpu_to_be32(len);
1099
1100 if (GFS2_EA_IS_LAST(ea))
1101 prev->ea_flags |= GFS2_EAFLAG_LAST;
1102 } else {
1103 ea->ea_type = GFS2_EATYPE_UNUSED;
1104 }
1105
1106 error = gfs2_meta_inode_buffer(ip, &dibh);
1107 if (!error) {
1108 ip->i_inode.i_ctime = CURRENT_TIME;
1109 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1110 gfs2_dinode_out(ip, dibh->b_data);
1111 brelse(dibh);
1112 }
1113
1114 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1115
1116 return error;
1117}
1118
1119/**
1120 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1121 * @ip: The inode
1122 * @type: The type of the extended attribute
1123 * @name: The name of the extended attribute
1124 *
1125 * This is not called directly by the VFS since we use the (common)
1126 * scheme of making a "set with NULL data" mean a remove request. Note
1127 * that this is different from a set with zero length data.
1128 *
1129 * Returns: 0, or errno on failure
1130 */
1131
1132static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1133{
1134 struct gfs2_ea_location el;
1135 int error;
1136
1137 if (!ip->i_eattr)
1138 return -ENODATA;
1139
1140 error = gfs2_ea_find(ip, type, name, &el);
1141 if (error)
1142 return error;
1143 if (!el.el_ea)
1144 return -ENODATA;
1145
1146 if (GFS2_EA_IS_STUFFED(el.el_ea))
1147 error = ea_remove_stuffed(ip, &el);
1148 else
1149 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1150
1151 brelse(el.el_bh);
1152
1153 return error;
1154}
1155
1156/**
1157 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1158 * @ip: The inode
1159 * @name: The name of the extended attribute
1160 * @value: The value of the extended attribute (NULL for remove)
1161 * @size: The size of the @value argument
1162 * @flags: Create or Replace
1163 * @type: The type of the extended attribute
1164 *
1165 * See gfs2_xattr_remove() for details of the removal of xattrs.
1166 *
1167 * Returns: 0 or errno on failure
1168 */
1169
1170int __gfs2_xattr_set(struct inode *inode, const char *name,
1171 const void *value, size_t size, int flags, int type)
1172{
1173 struct gfs2_inode *ip = GFS2_I(inode);
1174 struct gfs2_sbd *sdp = GFS2_SB(inode);
1175 struct gfs2_ea_location el;
1176 unsigned int namel = strlen(name);
1177 int error;
1178
1179 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1180 return -EPERM;
1181 if (namel > GFS2_EA_MAX_NAME_LEN)
1182 return -ERANGE;
1183
1184 if (value == NULL)
1185 return gfs2_xattr_remove(ip, type, name);
1186
1187 if (ea_check_size(sdp, namel, size))
1188 return -ERANGE;
1189
1190 if (!ip->i_eattr) {
1191 if (flags & XATTR_REPLACE)
1192 return -ENODATA;
1193 return ea_init(ip, type, name, value, size);
1194 }
1195
1196 error = gfs2_ea_find(ip, type, name, &el);
1197 if (error)
1198 return error;
1199
1200 if (el.el_ea) {
1201 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1202 brelse(el.el_bh);
1203 return -EPERM;
1204 }
1205
1206 error = -EEXIST;
1207 if (!(flags & XATTR_CREATE)) {
1208 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1209 error = ea_set_i(ip, type, name, value, size, &el);
1210 if (!error && unstuffed)
1211 ea_set_remove_unstuffed(ip, &el);
1212 }
1213
1214 brelse(el.el_bh);
1215 return error;
1216 }
1217
1218 error = -ENODATA;
1219 if (!(flags & XATTR_REPLACE))
1220 error = ea_set_i(ip, type, name, value, size, NULL);
1221
1222 return error;
1223}
1224
1225static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1226 const void *value, size_t size, int flags, int type)
1227{
1228 return __gfs2_xattr_set(dentry->d_inode, name, value,
1229 size, flags, type);
1230}
1231
1232static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1233 struct gfs2_ea_header *ea, char *data)
1234{
1235 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1236 struct buffer_head **bh;
1237 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1238 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1239 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1240 unsigned int x;
1241 int error;
1242
1243 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1244 if (!bh)
1245 return -ENOMEM;
1246
1247 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1248 if (error)
1249 goto out;
1250
1251 for (x = 0; x < nptrs; x++) {
1252 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1253 bh + x);
1254 if (error) {
1255 while (x--)
1256 brelse(bh[x]);
1257 goto fail;
1258 }
1259 dataptrs++;
1260 }
1261
1262 for (x = 0; x < nptrs; x++) {
1263 error = gfs2_meta_wait(sdp, bh[x]);
1264 if (error) {
1265 for (; x < nptrs; x++)
1266 brelse(bh[x]);
1267 goto fail;
1268 }
1269 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1270 for (; x < nptrs; x++)
1271 brelse(bh[x]);
1272 error = -EIO;
1273 goto fail;
1274 }
1275
1276 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1277
1278 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1279 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1280
1281 amount -= sdp->sd_jbsize;
1282 data += sdp->sd_jbsize;
1283
1284 brelse(bh[x]);
1285 }
1286
1287out:
1288 kfree(bh);
1289 return error;
1290
1291fail:
1292 gfs2_trans_end(sdp);
1293 kfree(bh);
1294 return error;
1295}
1296
1297int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1298{
1299 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1300 struct gfs2_ea_location el;
1301 int error;
1302
1303 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1304 if (error)
1305 return error;
1306
1307 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1308 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1309 if (error == 0) {
1310 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1311 memcpy(GFS2_EA2DATA(el.el_ea), data,
1312 GFS2_EA_DATA_LEN(el.el_ea));
1313 }
1314 } else {
1315 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1316 }
1317
1318 brelse(el.el_bh);
1319 if (error)
1320 return error;
1321
1322 error = gfs2_setattr_simple(ip, attr);
1323 gfs2_trans_end(sdp);
1324 return error;
1325}
1326
1327static int ea_dealloc_indirect(struct gfs2_inode *ip)
1328{
1329 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1330 struct gfs2_rgrp_list rlist;
1331 struct buffer_head *indbh, *dibh;
1332 __be64 *eablk, *end;
1333 unsigned int rg_blocks = 0;
1334 u64 bstart = 0;
1335 unsigned int blen = 0;
1336 unsigned int blks = 0;
1337 unsigned int x;
1338 int error;
1339
1340 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1341
1342 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1343 if (error)
1344 return error;
1345
1346 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1347 error = -EIO;
1348 goto out;
1349 }
1350
1351 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1352 end = eablk + sdp->sd_inptrs;
1353
1354 for (; eablk < end; eablk++) {
1355 u64 bn;
1356
1357 if (!*eablk)
1358 break;
1359 bn = be64_to_cpu(*eablk);
1360
1361 if (bstart + blen == bn)
1362 blen++;
1363 else {
1364 if (bstart)
1365 gfs2_rlist_add(sdp, &rlist, bstart);
1366 bstart = bn;
1367 blen = 1;
1368 }
1369 blks++;
1370 }
1371 if (bstart)
1372 gfs2_rlist_add(sdp, &rlist, bstart);
1373 else
1374 goto out;
1375
1376 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1377
1378 for (x = 0; x < rlist.rl_rgrps; x++) {
1379 struct gfs2_rgrpd *rgd;
1380 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1381 rg_blocks += rgd->rd_length;
1382 }
1383
1384 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385 if (error)
1386 goto out_rlist_free;
1387
1388 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1389 RES_STATFS + RES_QUOTA, blks);
1390 if (error)
1391 goto out_gunlock;
1392
1393 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1394
1395 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1396 bstart = 0;
1397 blen = 0;
1398
1399 for (; eablk < end; eablk++) {
1400 u64 bn;
1401
1402 if (!*eablk)
1403 break;
1404 bn = be64_to_cpu(*eablk);
1405
1406 if (bstart + blen == bn)
1407 blen++;
1408 else {
1409 if (bstart)
1410 gfs2_free_meta(ip, bstart, blen);
1411 bstart = bn;
1412 blen = 1;
1413 }
1414
1415 *eablk = 0;
1416 gfs2_add_inode_blocks(&ip->i_inode, -1);
1417 }
1418 if (bstart)
1419 gfs2_free_meta(ip, bstart, blen);
1420
1421 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1422
1423 error = gfs2_meta_inode_buffer(ip, &dibh);
1424 if (!error) {
1425 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1426 gfs2_dinode_out(ip, dibh->b_data);
1427 brelse(dibh);
1428 }
1429
1430 gfs2_trans_end(sdp);
1431
1432out_gunlock:
1433 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1434out_rlist_free:
1435 gfs2_rlist_free(&rlist);
1436out:
1437 brelse(indbh);
1438 return error;
1439}
1440
1441static int ea_dealloc_block(struct gfs2_inode *ip)
1442{
1443 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1444 struct gfs2_alloc *al = ip->i_alloc;
1445 struct gfs2_rgrpd *rgd;
1446 struct buffer_head *dibh;
1447 int error;
1448
1449 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1450 if (!rgd) {
1451 gfs2_consist_inode(ip);
1452 return -EIO;
1453 }
1454
1455 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1456 &al->al_rgd_gh);
1457 if (error)
1458 return error;
1459
1460 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1461 RES_QUOTA, 1);
1462 if (error)
1463 goto out_gunlock;
1464
1465 gfs2_free_meta(ip, ip->i_eattr, 1);
1466
1467 ip->i_eattr = 0;
1468 gfs2_add_inode_blocks(&ip->i_inode, -1);
1469
1470 error = gfs2_meta_inode_buffer(ip, &dibh);
1471 if (!error) {
1472 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1473 gfs2_dinode_out(ip, dibh->b_data);
1474 brelse(dibh);
1475 }
1476
1477 gfs2_trans_end(sdp);
1478
1479out_gunlock:
1480 gfs2_glock_dq_uninit(&al->al_rgd_gh);
1481 return error;
1482}
1483
1484/**
1485 * gfs2_ea_dealloc - deallocate the extended attribute fork
1486 * @ip: the inode
1487 *
1488 * Returns: errno
1489 */
1490
1491int gfs2_ea_dealloc(struct gfs2_inode *ip)
1492{
1493 struct gfs2_alloc *al;
1494 int error;
1495
1496 al = gfs2_alloc_get(ip);
1497 if (!al)
1498 return -ENOMEM;
1499
1500 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1501 if (error)
1502 goto out_alloc;
1503
1504 error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1505 if (error)
1506 goto out_quota;
1507
1508 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1509 if (error)
1510 goto out_rindex;
1511
1512 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513 error = ea_dealloc_indirect(ip);
1514 if (error)
1515 goto out_rindex;
1516 }
1517
1518 error = ea_dealloc_block(ip);
1519
1520out_rindex:
1521 gfs2_glock_dq_uninit(&al->al_ri_gh);
1522out_quota:
1523 gfs2_quota_unhold(ip);
1524out_alloc:
1525 gfs2_alloc_put(ip);
1526 return error;
1527}
1528
1529static const struct xattr_handler gfs2_xattr_user_handler = {
1530 .prefix = XATTR_USER_PREFIX,
1531 .flags = GFS2_EATYPE_USR,
1532 .get = gfs2_xattr_get,
1533 .set = gfs2_xattr_set,
1534};
1535
1536static const struct xattr_handler gfs2_xattr_security_handler = {
1537 .prefix = XATTR_SECURITY_PREFIX,
1538 .flags = GFS2_EATYPE_SECURITY,
1539 .get = gfs2_xattr_get,
1540 .set = gfs2_xattr_set,
1541};
1542
1543const struct xattr_handler *gfs2_xattr_handlers[] = {
1544 &gfs2_xattr_user_handler,
1545 &gfs2_xattr_security_handler,
1546 &gfs2_xattr_system_handler,
1547 NULL,
1548};
1549
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/xattr.h>
12#include <linux/gfs2_ondisk.h>
13#include <linux/posix_acl_xattr.h>
14#include <linux/uaccess.h>
15
16#include "gfs2.h"
17#include "incore.h"
18#include "acl.h"
19#include "xattr.h"
20#include "glock.h"
21#include "inode.h"
22#include "meta_io.h"
23#include "quota.h"
24#include "rgrp.h"
25#include "super.h"
26#include "trans.h"
27#include "util.h"
28
29/*
30 * ea_calc_size - returns the actual number of bytes the request will take up
31 * (not counting any unstuffed data blocks)
32 *
33 * Returns: 1 if the EA should be stuffed
34 */
35
36static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
37 unsigned int *size)
38{
39 unsigned int jbsize = sdp->sd_jbsize;
40
41 /* Stuffed */
42 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
43
44 if (*size <= jbsize)
45 return 1;
46
47 /* Unstuffed */
48 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
49 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
50
51 return 0;
52}
53
54static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
55{
56 unsigned int size;
57
58 if (dsize > GFS2_EA_MAX_DATA_LEN)
59 return -ERANGE;
60
61 ea_calc_size(sdp, nsize, dsize, &size);
62
63 /* This can only happen with 512 byte blocks */
64 if (size > sdp->sd_jbsize)
65 return -ERANGE;
66
67 return 0;
68}
69
70static bool gfs2_eatype_valid(struct gfs2_sbd *sdp, u8 type)
71{
72 switch(sdp->sd_sb.sb_fs_format) {
73 case GFS2_FS_FORMAT_MAX:
74 return true;
75
76 case GFS2_FS_FORMAT_MIN:
77 return type <= GFS2_EATYPE_SECURITY;
78
79 default:
80 return false;
81 }
82}
83
84typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
85 struct gfs2_ea_header *ea,
86 struct gfs2_ea_header *prev, void *private);
87
88static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
89 ea_call_t ea_call, void *data)
90{
91 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
92 struct gfs2_ea_header *ea, *prev = NULL;
93 int error = 0;
94
95 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
96 return -EIO;
97
98 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
99 if (!GFS2_EA_REC_LEN(ea)) {
100 gfs2_consist_inode(ip);
101 return -EIO;
102 }
103 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
104 bh->b_data + bh->b_size)) {
105 gfs2_consist_inode(ip);
106 return -EIO;
107 }
108 if (!gfs2_eatype_valid(sdp, ea->ea_type)) {
109 gfs2_consist_inode(ip);
110 return -EIO;
111 }
112 error = ea_call(ip, bh, ea, prev, data);
113 if (error)
114 return error;
115
116 if (GFS2_EA_IS_LAST(ea)) {
117 if ((char *)GFS2_EA2NEXT(ea) !=
118 bh->b_data + bh->b_size) {
119 gfs2_consist_inode(ip);
120 return -EIO;
121 }
122 break;
123 }
124 }
125
126 return error;
127}
128
129static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
130{
131 struct buffer_head *bh, *eabh;
132 __be64 *eablk, *end;
133 int error;
134
135 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
136 if (error)
137 return error;
138
139 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
140 error = ea_foreach_i(ip, bh, ea_call, data);
141 goto out;
142 }
143
144 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
145 error = -EIO;
146 goto out;
147 }
148
149 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
150 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
151
152 for (; eablk < end; eablk++) {
153 u64 bn;
154
155 if (!*eablk)
156 break;
157 bn = be64_to_cpu(*eablk);
158
159 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
160 if (error)
161 break;
162 error = ea_foreach_i(ip, eabh, ea_call, data);
163 brelse(eabh);
164 if (error)
165 break;
166 }
167out:
168 brelse(bh);
169 return error;
170}
171
172struct ea_find {
173 int type;
174 const char *name;
175 size_t namel;
176 struct gfs2_ea_location *ef_el;
177};
178
179static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
180 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
181 void *private)
182{
183 struct ea_find *ef = private;
184
185 if (ea->ea_type == GFS2_EATYPE_UNUSED)
186 return 0;
187
188 if (ea->ea_type == ef->type) {
189 if (ea->ea_name_len == ef->namel &&
190 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
191 struct gfs2_ea_location *el = ef->ef_el;
192 get_bh(bh);
193 el->el_bh = bh;
194 el->el_ea = ea;
195 el->el_prev = prev;
196 return 1;
197 }
198 }
199
200 return 0;
201}
202
203static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
204 struct gfs2_ea_location *el)
205{
206 struct ea_find ef;
207 int error;
208
209 ef.type = type;
210 ef.name = name;
211 ef.namel = strlen(name);
212 ef.ef_el = el;
213
214 memset(el, 0, sizeof(struct gfs2_ea_location));
215
216 error = ea_foreach(ip, ea_find_i, &ef);
217 if (error > 0)
218 return 0;
219
220 return error;
221}
222
223/*
224 * ea_dealloc_unstuffed
225 *
226 * Take advantage of the fact that all unstuffed blocks are
227 * allocated from the same RG. But watch, this may not always
228 * be true.
229 *
230 * Returns: errno
231 */
232
233static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
234 struct gfs2_ea_header *ea,
235 struct gfs2_ea_header *prev, void *private)
236{
237 int *leave = private;
238 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
239 struct gfs2_rgrpd *rgd;
240 struct gfs2_holder rg_gh;
241 __be64 *dataptrs;
242 u64 bn = 0;
243 u64 bstart = 0;
244 unsigned int blen = 0;
245 unsigned int blks = 0;
246 unsigned int x;
247 int error;
248
249 error = gfs2_rindex_update(sdp);
250 if (error)
251 return error;
252
253 if (GFS2_EA_IS_STUFFED(ea))
254 return 0;
255
256 dataptrs = GFS2_EA2DATAPTRS(ea);
257 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
258 if (*dataptrs) {
259 blks++;
260 bn = be64_to_cpu(*dataptrs);
261 }
262 }
263 if (!blks)
264 return 0;
265
266 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
267 if (!rgd) {
268 gfs2_consist_inode(ip);
269 return -EIO;
270 }
271
272 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
273 LM_FLAG_NODE_SCOPE, &rg_gh);
274 if (error)
275 return error;
276
277 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
278 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
279 if (error)
280 goto out_gunlock;
281
282 gfs2_trans_add_meta(ip->i_gl, bh);
283
284 dataptrs = GFS2_EA2DATAPTRS(ea);
285 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
286 if (!*dataptrs)
287 break;
288 bn = be64_to_cpu(*dataptrs);
289
290 if (bstart + blen == bn)
291 blen++;
292 else {
293 if (bstart)
294 gfs2_free_meta(ip, rgd, bstart, blen);
295 bstart = bn;
296 blen = 1;
297 }
298
299 *dataptrs = 0;
300 gfs2_add_inode_blocks(&ip->i_inode, -1);
301 }
302 if (bstart)
303 gfs2_free_meta(ip, rgd, bstart, blen);
304
305 if (prev && !leave) {
306 u32 len;
307
308 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
309 prev->ea_rec_len = cpu_to_be32(len);
310
311 if (GFS2_EA_IS_LAST(ea))
312 prev->ea_flags |= GFS2_EAFLAG_LAST;
313 } else {
314 ea->ea_type = GFS2_EATYPE_UNUSED;
315 ea->ea_num_ptrs = 0;
316 }
317
318 inode_set_ctime_current(&ip->i_inode);
319 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
320
321 gfs2_trans_end(sdp);
322
323out_gunlock:
324 gfs2_glock_dq_uninit(&rg_gh);
325 return error;
326}
327
328static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
329 struct gfs2_ea_header *ea,
330 struct gfs2_ea_header *prev, int leave)
331{
332 int error;
333
334 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
335 if (error)
336 return error;
337
338 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
339 if (error)
340 goto out_alloc;
341
342 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
343
344 gfs2_quota_unhold(ip);
345out_alloc:
346 return error;
347}
348
349struct ea_list {
350 struct gfs2_ea_request *ei_er;
351 unsigned int ei_size;
352};
353
354static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
355 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
356 void *private)
357{
358 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
359 struct ea_list *ei = private;
360 struct gfs2_ea_request *er = ei->ei_er;
361 unsigned int ea_size;
362 char *prefix;
363 unsigned int l;
364
365 if (ea->ea_type == GFS2_EATYPE_UNUSED)
366 return 0;
367
368 BUG_ON(ea->ea_type > GFS2_EATYPE_SECURITY &&
369 sdp->sd_sb.sb_fs_format == GFS2_FS_FORMAT_MIN);
370 switch (ea->ea_type) {
371 case GFS2_EATYPE_USR:
372 prefix = "user.";
373 l = 5;
374 break;
375 case GFS2_EATYPE_SYS:
376 prefix = "system.";
377 l = 7;
378 break;
379 case GFS2_EATYPE_SECURITY:
380 prefix = "security.";
381 l = 9;
382 break;
383 case GFS2_EATYPE_TRUSTED:
384 prefix = "trusted.";
385 l = 8;
386 break;
387 default:
388 return 0;
389 }
390
391 ea_size = l + ea->ea_name_len + 1;
392 if (er->er_data_len) {
393 if (ei->ei_size + ea_size > er->er_data_len)
394 return -ERANGE;
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 er->er_data[ei->ei_size + ea_size - 1] = 0;
400 }
401
402 ei->ei_size += ea_size;
403
404 return 0;
405}
406
407/**
408 * gfs2_listxattr - List gfs2 extended attributes
409 * @dentry: The dentry whose inode we are interested in
410 * @buffer: The buffer to write the results
411 * @size: The size of the buffer
412 *
413 * Returns: actual size of data on success, -errno on error
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
446/**
447 * gfs2_iter_unstuffed - copies the unstuffed xattr data to/from the
448 * request buffer
449 * @ip: The GFS2 inode
450 * @ea: The extended attribute header structure
451 * @din: The data to be copied in
452 * @dout: The data to be copied out (one of din,dout will be NULL)
453 *
454 * Returns: errno
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 * __gfs2_xattr_get - Get a GFS2 extended attribute
573 * @inode: The inode
574 * @name: The name of the extended attribute
575 * @buffer: The buffer to write the result into
576 * @size: The size of the buffer
577 * @type: The type of extended attribute
578 *
579 * Returns: actual size of data on success, -errno on error
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 /* During lookup, SELinux calls this function with the glock locked. */
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 * ea_alloc_blk - allocates a new block for extended attributes.
632 * @ip: A pointer to the inode that's getting extended attributes
633 * @bhp: Pointer to pointer to a struct buffer_head
634 *
635 * Returns: errno
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);
647 if (error)
648 return error;
649 gfs2_trans_remove_revoke(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 * ea_write - writes the request info to an ea, creating new blocks if
668 * necessary
669 * @ip: inode that is being modified
670 * @ea: the location of the new ea in a block
671 * @er: the write request
672 *
673 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
674 *
675 * returns : errno
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);
709 if (error)
710 return error;
711 gfs2_trans_remove_revoke(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 inode_set_ctime_current(&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 * ea_init - initializes a new eattr block
802 *
803 * Returns: errno
804 */
805static int ea_init(struct gfs2_inode *ip, int type, const char *name,
806 const void *data, size_t size)
807{
808 struct gfs2_ea_request er;
809 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
810 unsigned int blks = 1;
811
812 er.er_type = type;
813 er.er_name = name;
814 er.er_name_len = strlen(name);
815 er.er_data = (void *)data;
816 er.er_data_len = size;
817
818 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
819 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
820
821 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
822}
823
824static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
825{
826 u32 ea_size = GFS2_EA_SIZE(ea);
827 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
828 ea_size);
829 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
830 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
831
832 ea->ea_rec_len = cpu_to_be32(ea_size);
833 ea->ea_flags ^= last;
834
835 new->ea_rec_len = cpu_to_be32(new_size);
836 new->ea_flags = last;
837
838 return new;
839}
840
841static void ea_set_remove_stuffed(struct gfs2_inode *ip,
842 struct gfs2_ea_location *el)
843{
844 struct gfs2_ea_header *ea = el->el_ea;
845 struct gfs2_ea_header *prev = el->el_prev;
846 u32 len;
847
848 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
849
850 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
851 ea->ea_type = GFS2_EATYPE_UNUSED;
852 return;
853 } else if (GFS2_EA2NEXT(prev) != ea) {
854 prev = GFS2_EA2NEXT(prev);
855 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
856 }
857
858 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
859 prev->ea_rec_len = cpu_to_be32(len);
860
861 if (GFS2_EA_IS_LAST(ea))
862 prev->ea_flags |= GFS2_EAFLAG_LAST;
863}
864
865struct ea_set {
866 int ea_split;
867
868 struct gfs2_ea_request *es_er;
869 struct gfs2_ea_location *es_el;
870
871 struct buffer_head *es_bh;
872 struct gfs2_ea_header *es_ea;
873};
874
875static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
876 struct gfs2_ea_header *ea, struct ea_set *es)
877{
878 struct gfs2_ea_request *er = es->es_er;
879 int error;
880
881 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
882 if (error)
883 return error;
884
885 gfs2_trans_add_meta(ip->i_gl, bh);
886
887 if (es->ea_split)
888 ea = ea_split_ea(ea);
889
890 ea_write(ip, ea, er);
891
892 if (es->es_el)
893 ea_set_remove_stuffed(ip, es->es_el);
894
895 inode_set_ctime_current(&ip->i_inode);
896 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
897
898 gfs2_trans_end(GFS2_SB(&ip->i_inode));
899 return error;
900}
901
902static int ea_set_simple_alloc(struct gfs2_inode *ip,
903 struct gfs2_ea_request *er, void *private)
904{
905 struct ea_set *es = private;
906 struct gfs2_ea_header *ea = es->es_ea;
907 int error;
908
909 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
910
911 if (es->ea_split)
912 ea = ea_split_ea(ea);
913
914 error = ea_write(ip, ea, er);
915 if (error)
916 return error;
917
918 if (es->es_el)
919 ea_set_remove_stuffed(ip, es->es_el);
920
921 return 0;
922}
923
924static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
925 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
926 void *private)
927{
928 struct ea_set *es = private;
929 unsigned int size;
930 int stuffed;
931 int error;
932
933 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
934 es->es_er->er_data_len, &size);
935
936 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
937 if (GFS2_EA_REC_LEN(ea) < size)
938 return 0;
939 if (!GFS2_EA_IS_STUFFED(ea)) {
940 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
941 if (error)
942 return error;
943 }
944 es->ea_split = 0;
945 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
946 es->ea_split = 1;
947 else
948 return 0;
949
950 if (stuffed) {
951 error = ea_set_simple_noalloc(ip, bh, ea, es);
952 if (error)
953 return error;
954 } else {
955 unsigned int blks;
956
957 es->es_bh = bh;
958 es->es_ea = ea;
959 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
960 GFS2_SB(&ip->i_inode)->sd_jbsize);
961
962 error = ea_alloc_skeleton(ip, es->es_er, blks,
963 ea_set_simple_alloc, es);
964 if (error)
965 return error;
966 }
967
968 return 1;
969}
970
971static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
972 void *private)
973{
974 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
975 struct buffer_head *indbh, *newbh;
976 __be64 *eablk;
977 int error;
978 int mh_size = sizeof(struct gfs2_meta_header);
979
980 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
981 __be64 *end;
982
983 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
984 &indbh);
985 if (error)
986 return error;
987
988 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
989 error = -EIO;
990 goto out;
991 }
992
993 eablk = (__be64 *)(indbh->b_data + mh_size);
994 end = eablk + sdp->sd_inptrs;
995
996 for (; eablk < end; eablk++)
997 if (!*eablk)
998 break;
999
1000 if (eablk == end) {
1001 error = -ENOSPC;
1002 goto out;
1003 }
1004
1005 gfs2_trans_add_meta(ip->i_gl, indbh);
1006 } else {
1007 u64 blk;
1008 unsigned int n = 1;
1009 error = gfs2_alloc_blocks(ip, &blk, &n, 0);
1010 if (error)
1011 return error;
1012 gfs2_trans_remove_revoke(sdp, blk, 1);
1013 indbh = gfs2_meta_new(ip->i_gl, blk);
1014 gfs2_trans_add_meta(ip->i_gl, indbh);
1015 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1016 gfs2_buffer_clear_tail(indbh, mh_size);
1017
1018 eablk = (__be64 *)(indbh->b_data + mh_size);
1019 *eablk = cpu_to_be64(ip->i_eattr);
1020 ip->i_eattr = blk;
1021 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1022 gfs2_add_inode_blocks(&ip->i_inode, 1);
1023
1024 eablk++;
1025 }
1026
1027 error = ea_alloc_blk(ip, &newbh);
1028 if (error)
1029 goto out;
1030
1031 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1032 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1033 brelse(newbh);
1034 if (error)
1035 goto out;
1036
1037 if (private)
1038 ea_set_remove_stuffed(ip, private);
1039
1040out:
1041 brelse(indbh);
1042 return error;
1043}
1044
1045static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1046 const void *value, size_t size, struct gfs2_ea_location *el)
1047{
1048 struct gfs2_ea_request er;
1049 struct ea_set es;
1050 unsigned int blks = 2;
1051 int error;
1052
1053 er.er_type = type;
1054 er.er_name = name;
1055 er.er_data = (void *)value;
1056 er.er_name_len = strlen(name);
1057 er.er_data_len = size;
1058
1059 memset(&es, 0, sizeof(struct ea_set));
1060 es.es_er = &er;
1061 es.es_el = el;
1062
1063 error = ea_foreach(ip, ea_set_simple, &es);
1064 if (error > 0)
1065 return 0;
1066 if (error)
1067 return error;
1068
1069 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1070 blks++;
1071 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1072 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1073
1074 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1075}
1076
1077static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1078 struct gfs2_ea_location *el)
1079{
1080 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1081 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1082 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1083 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1084 }
1085
1086 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1087}
1088
1089static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1090{
1091 struct gfs2_ea_header *ea = el->el_ea;
1092 struct gfs2_ea_header *prev = el->el_prev;
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 inode_set_ctime_current(&ip->i_inode);
1114 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1115
1116 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1117
1118 return error;
1119}
1120
1121/**
1122 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1123 * @ip: The inode
1124 * @type: The type of the extended attribute
1125 * @name: The name of the extended attribute
1126 *
1127 * This is not called directly by the VFS since we use the (common)
1128 * scheme of making a "set with NULL data" mean a remove request. Note
1129 * that this is different from a set with zero length data.
1130 *
1131 * Returns: 0, or errno on failure
1132 */
1133
1134static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1135{
1136 struct gfs2_ea_location el;
1137 int error;
1138
1139 if (!ip->i_eattr)
1140 return -ENODATA;
1141
1142 error = gfs2_ea_find(ip, type, name, &el);
1143 if (error)
1144 return error;
1145 if (!el.el_ea)
1146 return -ENODATA;
1147
1148 if (GFS2_EA_IS_STUFFED(el.el_ea))
1149 error = ea_remove_stuffed(ip, &el);
1150 else
1151 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1152
1153 brelse(el.el_bh);
1154
1155 return error;
1156}
1157
1158/**
1159 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1160 * @inode: The inode
1161 * @name: The name of the extended attribute
1162 * @value: The value of the extended attribute (NULL for remove)
1163 * @size: The size of the @value argument
1164 * @flags: Create or Replace
1165 * @type: The type of the extended attribute
1166 *
1167 * See gfs2_xattr_remove() for details of the removal of xattrs.
1168 *
1169 * Returns: 0 or errno on failure
1170 */
1171
1172int __gfs2_xattr_set(struct inode *inode, const char *name,
1173 const void *value, size_t size, int flags, int type)
1174{
1175 struct gfs2_inode *ip = GFS2_I(inode);
1176 struct gfs2_sbd *sdp = GFS2_SB(inode);
1177 struct gfs2_ea_location el;
1178 unsigned int namel = strlen(name);
1179 int error;
1180
1181 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1182 return -EPERM;
1183 if (namel > GFS2_EA_MAX_NAME_LEN)
1184 return -ERANGE;
1185
1186 if (value == NULL) {
1187 error = gfs2_xattr_remove(ip, type, name);
1188 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1189 error = 0;
1190 return error;
1191 }
1192
1193 if (ea_check_size(sdp, namel, size))
1194 return -ERANGE;
1195
1196 if (!ip->i_eattr) {
1197 if (flags & XATTR_REPLACE)
1198 return -ENODATA;
1199 return ea_init(ip, type, name, value, size);
1200 }
1201
1202 error = gfs2_ea_find(ip, type, name, &el);
1203 if (error)
1204 return error;
1205
1206 if (el.el_ea) {
1207 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1208 brelse(el.el_bh);
1209 return -EPERM;
1210 }
1211
1212 error = -EEXIST;
1213 if (!(flags & XATTR_CREATE)) {
1214 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1215 error = ea_set_i(ip, type, name, value, size, &el);
1216 if (!error && unstuffed)
1217 ea_set_remove_unstuffed(ip, &el);
1218 }
1219
1220 brelse(el.el_bh);
1221 return error;
1222 }
1223
1224 error = -ENODATA;
1225 if (!(flags & XATTR_REPLACE))
1226 error = ea_set_i(ip, type, name, value, size, NULL);
1227
1228 return error;
1229}
1230
1231static int gfs2_xattr_set(const struct xattr_handler *handler,
1232 struct mnt_idmap *idmap,
1233 struct dentry *unused, struct inode *inode,
1234 const char *name, const void *value,
1235 size_t size, int flags)
1236{
1237 struct gfs2_inode *ip = GFS2_I(inode);
1238 struct gfs2_holder gh;
1239 int ret;
1240
1241 ret = gfs2_qa_get(ip);
1242 if (ret)
1243 return ret;
1244
1245 /* May be called from gfs_setattr with the glock locked. */
1246
1247 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1248 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1249 if (ret)
1250 goto out;
1251 } else {
1252 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1253 ret = -EIO;
1254 goto out;
1255 }
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);
1261out:
1262 gfs2_qa_put(ip);
1263 return ret;
1264}
1265
1266static int ea_dealloc_indirect(struct gfs2_inode *ip)
1267{
1268 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1269 struct gfs2_rgrp_list rlist;
1270 struct gfs2_rgrpd *rgd;
1271 struct buffer_head *indbh, *dibh;
1272 __be64 *eablk, *end;
1273 unsigned int rg_blocks = 0;
1274 u64 bstart = 0;
1275 unsigned int blen = 0;
1276 unsigned int blks = 0;
1277 unsigned int x;
1278 int error;
1279
1280 error = gfs2_rindex_update(sdp);
1281 if (error)
1282 return error;
1283
1284 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1285
1286 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1287 if (error)
1288 return error;
1289
1290 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1291 error = -EIO;
1292 goto out;
1293 }
1294
1295 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1296 end = eablk + sdp->sd_inptrs;
1297
1298 for (; eablk < end; eablk++) {
1299 u64 bn;
1300
1301 if (!*eablk)
1302 break;
1303 bn = be64_to_cpu(*eablk);
1304
1305 if (bstart + blen == bn)
1306 blen++;
1307 else {
1308 if (bstart)
1309 gfs2_rlist_add(ip, &rlist, bstart);
1310 bstart = bn;
1311 blen = 1;
1312 }
1313 blks++;
1314 }
1315 if (bstart)
1316 gfs2_rlist_add(ip, &rlist, bstart);
1317 else
1318 goto out;
1319
1320 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE);
1321
1322 for (x = 0; x < rlist.rl_rgrps; x++) {
1323 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1324 rg_blocks += rgd->rd_length;
1325 }
1326
1327 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1328 if (error)
1329 goto out_rlist_free;
1330
1331 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1332 RES_STATFS + RES_QUOTA, blks);
1333 if (error)
1334 goto out_gunlock;
1335
1336 gfs2_trans_add_meta(ip->i_gl, indbh);
1337
1338 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1339 bstart = 0;
1340 rgd = NULL;
1341 blen = 0;
1342
1343 for (; eablk < end; eablk++) {
1344 u64 bn;
1345
1346 if (!*eablk)
1347 break;
1348 bn = be64_to_cpu(*eablk);
1349
1350 if (bstart + blen == bn)
1351 blen++;
1352 else {
1353 if (bstart)
1354 gfs2_free_meta(ip, rgd, bstart, blen);
1355 bstart = bn;
1356 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1357 blen = 1;
1358 }
1359
1360 *eablk = 0;
1361 gfs2_add_inode_blocks(&ip->i_inode, -1);
1362 }
1363 if (bstart)
1364 gfs2_free_meta(ip, rgd, bstart, blen);
1365
1366 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1367
1368 error = gfs2_meta_inode_buffer(ip, &dibh);
1369 if (!error) {
1370 gfs2_trans_add_meta(ip->i_gl, dibh);
1371 gfs2_dinode_out(ip, dibh->b_data);
1372 brelse(dibh);
1373 }
1374
1375 gfs2_trans_end(sdp);
1376
1377out_gunlock:
1378 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1379out_rlist_free:
1380 gfs2_rlist_free(&rlist);
1381out:
1382 brelse(indbh);
1383 return error;
1384}
1385
1386static int ea_dealloc_block(struct gfs2_inode *ip)
1387{
1388 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1389 struct gfs2_rgrpd *rgd;
1390 struct buffer_head *dibh;
1391 struct gfs2_holder gh;
1392 int error;
1393
1394 error = gfs2_rindex_update(sdp);
1395 if (error)
1396 return error;
1397
1398 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1399 if (!rgd) {
1400 gfs2_consist_inode(ip);
1401 return -EIO;
1402 }
1403
1404 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1405 LM_FLAG_NODE_SCOPE, &gh);
1406 if (error)
1407 return error;
1408
1409 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1410 RES_QUOTA, 1);
1411 if (error)
1412 goto out_gunlock;
1413
1414 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1415
1416 ip->i_eattr = 0;
1417 gfs2_add_inode_blocks(&ip->i_inode, -1);
1418
1419 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1420 error = gfs2_meta_inode_buffer(ip, &dibh);
1421 if (!error) {
1422 gfs2_trans_add_meta(ip->i_gl, dibh);
1423 gfs2_dinode_out(ip, dibh->b_data);
1424 brelse(dibh);
1425 }
1426 }
1427
1428 gfs2_trans_end(sdp);
1429
1430out_gunlock:
1431 gfs2_glock_dq_uninit(&gh);
1432 return error;
1433}
1434
1435/**
1436 * gfs2_ea_dealloc - deallocate the extended attribute fork
1437 * @ip: the inode
1438 *
1439 * Returns: errno
1440 */
1441
1442int gfs2_ea_dealloc(struct gfs2_inode *ip)
1443{
1444 int error;
1445
1446 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1447 if (error)
1448 return error;
1449
1450 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1451 if (error)
1452 return error;
1453
1454 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1455 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1456 if (error)
1457 goto out_quota;
1458
1459 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1460 error = ea_dealloc_indirect(ip);
1461 if (error)
1462 goto out_quota;
1463 }
1464 }
1465
1466 error = ea_dealloc_block(ip);
1467
1468out_quota:
1469 gfs2_quota_unhold(ip);
1470 return error;
1471}
1472
1473static const struct xattr_handler gfs2_xattr_user_handler = {
1474 .prefix = XATTR_USER_PREFIX,
1475 .flags = GFS2_EATYPE_USR,
1476 .get = gfs2_xattr_get,
1477 .set = gfs2_xattr_set,
1478};
1479
1480static const struct xattr_handler gfs2_xattr_security_handler = {
1481 .prefix = XATTR_SECURITY_PREFIX,
1482 .flags = GFS2_EATYPE_SECURITY,
1483 .get = gfs2_xattr_get,
1484 .set = gfs2_xattr_set,
1485};
1486
1487static bool
1488gfs2_xattr_trusted_list(struct dentry *dentry)
1489{
1490 return capable(CAP_SYS_ADMIN);
1491}
1492
1493static const struct xattr_handler gfs2_xattr_trusted_handler = {
1494 .prefix = XATTR_TRUSTED_PREFIX,
1495 .flags = GFS2_EATYPE_TRUSTED,
1496 .list = gfs2_xattr_trusted_list,
1497 .get = gfs2_xattr_get,
1498 .set = gfs2_xattr_set,
1499};
1500
1501const struct xattr_handler * const gfs2_xattr_handlers_max[] = {
1502 /* GFS2_FS_FORMAT_MAX */
1503 &gfs2_xattr_trusted_handler,
1504
1505 /* GFS2_FS_FORMAT_MIN */
1506 &gfs2_xattr_user_handler,
1507 &gfs2_xattr_security_handler,
1508 NULL,
1509};
1510
1511const struct xattr_handler * const *gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;