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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 goto fail;
101 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
102 bh->b_data + bh->b_size))
103 goto fail;
104 if (!gfs2_eatype_valid(sdp, ea->ea_type))
105 goto fail;
106 error = ea_call(ip, bh, ea, prev, data);
107 if (error)
108 return error;
109
110 if (GFS2_EA_IS_LAST(ea)) {
111 if ((char *)GFS2_EA2NEXT(ea) !=
112 bh->b_data + bh->b_size)
113 goto fail;
114 break;
115 }
116 }
117
118 return error;
119
120fail:
121 gfs2_consist_inode(ip);
122 return -EIO;
123}
124
125static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
126{
127 struct buffer_head *bh, *eabh;
128 __be64 *eablk, *end;
129 int error;
130
131 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
132 if (error)
133 return error;
134
135 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
136 error = ea_foreach_i(ip, bh, ea_call, data);
137 goto out;
138 }
139
140 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
141 error = -EIO;
142 goto out;
143 }
144
145 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
146 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
147
148 for (; eablk < end; eablk++) {
149 u64 bn;
150
151 if (!*eablk)
152 break;
153 bn = be64_to_cpu(*eablk);
154
155 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
156 if (error)
157 break;
158 error = ea_foreach_i(ip, eabh, ea_call, data);
159 brelse(eabh);
160 if (error)
161 break;
162 }
163out:
164 brelse(bh);
165 return error;
166}
167
168struct ea_find {
169 int type;
170 const char *name;
171 size_t namel;
172 struct gfs2_ea_location *ef_el;
173};
174
175static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
176 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
177 void *private)
178{
179 struct ea_find *ef = private;
180
181 if (ea->ea_type == GFS2_EATYPE_UNUSED)
182 return 0;
183
184 if (ea->ea_type == ef->type) {
185 if (ea->ea_name_len == ef->namel &&
186 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
187 struct gfs2_ea_location *el = ef->ef_el;
188 get_bh(bh);
189 el->el_bh = bh;
190 el->el_ea = ea;
191 el->el_prev = prev;
192 return 1;
193 }
194 }
195
196 return 0;
197}
198
199static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
200 struct gfs2_ea_location *el)
201{
202 struct ea_find ef;
203 int error;
204
205 ef.type = type;
206 ef.name = name;
207 ef.namel = strlen(name);
208 ef.ef_el = el;
209
210 memset(el, 0, sizeof(struct gfs2_ea_location));
211
212 error = ea_foreach(ip, ea_find_i, &ef);
213 if (error > 0)
214 return 0;
215
216 return error;
217}
218
219/*
220 * ea_dealloc_unstuffed
221 *
222 * Take advantage of the fact that all unstuffed blocks are
223 * allocated from the same RG. But watch, this may not always
224 * be true.
225 *
226 * Returns: errno
227 */
228
229static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
230 struct gfs2_ea_header *ea,
231 struct gfs2_ea_header *prev, void *private)
232{
233 int *leave = private;
234 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
235 struct gfs2_rgrpd *rgd;
236 struct gfs2_holder rg_gh;
237 __be64 *dataptrs;
238 u64 bn = 0;
239 u64 bstart = 0;
240 unsigned int blen = 0;
241 unsigned int blks = 0;
242 unsigned int x;
243 int error;
244
245 error = gfs2_rindex_update(sdp);
246 if (error)
247 return error;
248
249 if (GFS2_EA_IS_STUFFED(ea))
250 return 0;
251
252 dataptrs = GFS2_EA2DATAPTRS(ea);
253 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
254 if (*dataptrs) {
255 blks++;
256 bn = be64_to_cpu(*dataptrs);
257 }
258 }
259 if (!blks)
260 return 0;
261
262 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
263 if (!rgd) {
264 gfs2_consist_inode(ip);
265 return -EIO;
266 }
267
268 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
269 LM_FLAG_NODE_SCOPE, &rg_gh);
270 if (error)
271 return error;
272
273 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
274 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
275 if (error)
276 goto out_gunlock;
277
278 gfs2_trans_add_meta(ip->i_gl, bh);
279
280 dataptrs = GFS2_EA2DATAPTRS(ea);
281 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
282 if (!*dataptrs)
283 break;
284 bn = be64_to_cpu(*dataptrs);
285
286 if (bstart + blen == bn)
287 blen++;
288 else {
289 if (bstart)
290 gfs2_free_meta(ip, rgd, bstart, blen);
291 bstart = bn;
292 blen = 1;
293 }
294
295 *dataptrs = 0;
296 gfs2_add_inode_blocks(&ip->i_inode, -1);
297 }
298 if (bstart)
299 gfs2_free_meta(ip, rgd, bstart, blen);
300
301 if (prev && !leave) {
302 u32 len;
303
304 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
305 prev->ea_rec_len = cpu_to_be32(len);
306
307 if (GFS2_EA_IS_LAST(ea))
308 prev->ea_flags |= GFS2_EAFLAG_LAST;
309 } else {
310 ea->ea_type = GFS2_EATYPE_UNUSED;
311 ea->ea_num_ptrs = 0;
312 }
313
314 inode_set_ctime_current(&ip->i_inode);
315 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
316
317 gfs2_trans_end(sdp);
318
319out_gunlock:
320 gfs2_glock_dq_uninit(&rg_gh);
321 return error;
322}
323
324static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
325 struct gfs2_ea_header *ea,
326 struct gfs2_ea_header *prev, int leave)
327{
328 int error;
329
330 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
331 if (error)
332 return error;
333
334 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
335 if (error)
336 goto out_alloc;
337
338 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
339
340 gfs2_quota_unhold(ip);
341out_alloc:
342 return error;
343}
344
345struct ea_list {
346 struct gfs2_ea_request *ei_er;
347 unsigned int ei_size;
348};
349
350static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
351 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
352 void *private)
353{
354 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
355 struct ea_list *ei = private;
356 struct gfs2_ea_request *er = ei->ei_er;
357 unsigned int ea_size;
358 char *prefix;
359 unsigned int l;
360
361 if (ea->ea_type == GFS2_EATYPE_UNUSED)
362 return 0;
363
364 BUG_ON(ea->ea_type > GFS2_EATYPE_SECURITY &&
365 sdp->sd_sb.sb_fs_format == GFS2_FS_FORMAT_MIN);
366 switch (ea->ea_type) {
367 case GFS2_EATYPE_USR:
368 prefix = "user.";
369 l = 5;
370 break;
371 case GFS2_EATYPE_SYS:
372 prefix = "system.";
373 l = 7;
374 break;
375 case GFS2_EATYPE_SECURITY:
376 prefix = "security.";
377 l = 9;
378 break;
379 case GFS2_EATYPE_TRUSTED:
380 prefix = "trusted.";
381 l = 8;
382 break;
383 default:
384 return 0;
385 }
386
387 ea_size = l + ea->ea_name_len + 1;
388 if (er->er_data_len) {
389 if (ei->ei_size + ea_size > er->er_data_len)
390 return -ERANGE;
391
392 memcpy(er->er_data + ei->ei_size, prefix, l);
393 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
394 ea->ea_name_len);
395 er->er_data[ei->ei_size + ea_size - 1] = 0;
396 }
397
398 ei->ei_size += ea_size;
399
400 return 0;
401}
402
403/**
404 * gfs2_listxattr - List gfs2 extended attributes
405 * @dentry: The dentry whose inode we are interested in
406 * @buffer: The buffer to write the results
407 * @size: The size of the buffer
408 *
409 * Returns: actual size of data on success, -errno on error
410 */
411
412ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
413{
414 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
415 struct gfs2_ea_request er;
416 struct gfs2_holder i_gh;
417 int error;
418
419 memset(&er, 0, sizeof(struct gfs2_ea_request));
420 if (size) {
421 er.er_data = buffer;
422 er.er_data_len = size;
423 }
424
425 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
426 if (error)
427 return error;
428
429 if (ip->i_eattr) {
430 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
431
432 error = ea_foreach(ip, ea_list_i, &ei);
433 if (!error)
434 error = ei.ei_size;
435 }
436
437 gfs2_glock_dq_uninit(&i_gh);
438
439 return error;
440}
441
442/**
443 * gfs2_iter_unstuffed - copies the unstuffed xattr data to/from the
444 * request buffer
445 * @ip: The GFS2 inode
446 * @ea: The extended attribute header structure
447 * @din: The data to be copied in
448 * @dout: The data to be copied out (one of din,dout will be NULL)
449 *
450 * Returns: errno
451 */
452
453static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
454 const char *din, char *dout)
455{
456 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
457 struct buffer_head **bh;
458 unsigned int amount = GFS2_EA_DATA_LEN(ea);
459 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
460 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
461 unsigned int x;
462 int error = 0;
463 unsigned char *pos;
464 unsigned cp_size;
465
466 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
467 if (!bh)
468 return -ENOMEM;
469
470 for (x = 0; x < nptrs; x++) {
471 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
472 bh + x);
473 if (error) {
474 while (x--)
475 brelse(bh[x]);
476 goto out;
477 }
478 dataptrs++;
479 }
480
481 for (x = 0; x < nptrs; x++) {
482 error = gfs2_meta_wait(sdp, bh[x]);
483 if (error) {
484 for (; x < nptrs; x++)
485 brelse(bh[x]);
486 goto out;
487 }
488 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
489 for (; x < nptrs; x++)
490 brelse(bh[x]);
491 error = -EIO;
492 goto out;
493 }
494
495 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
496 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
497
498 if (dout) {
499 memcpy(dout, pos, cp_size);
500 dout += sdp->sd_jbsize;
501 }
502
503 if (din) {
504 gfs2_trans_add_meta(ip->i_gl, bh[x]);
505 memcpy(pos, din, cp_size);
506 din += sdp->sd_jbsize;
507 }
508
509 amount -= sdp->sd_jbsize;
510 brelse(bh[x]);
511 }
512
513out:
514 kfree(bh);
515 return error;
516}
517
518static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
519 char *data, size_t size)
520{
521 int ret;
522 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
523 if (len > size)
524 return -ERANGE;
525
526 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
527 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
528 return len;
529 }
530 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
531 if (ret < 0)
532 return ret;
533 return len;
534}
535
536int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
537{
538 struct gfs2_ea_location el;
539 int error;
540 int len;
541 char *data;
542
543 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
544 if (error)
545 return error;
546 if (!el.el_ea)
547 goto out;
548 if (!GFS2_EA_DATA_LEN(el.el_ea))
549 goto out;
550
551 len = GFS2_EA_DATA_LEN(el.el_ea);
552 data = kmalloc(len, GFP_NOFS);
553 error = -ENOMEM;
554 if (data == NULL)
555 goto out;
556
557 error = gfs2_ea_get_copy(ip, &el, data, len);
558 if (error < 0)
559 kfree(data);
560 else
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 inode *inode, const char *name,
578 void *buffer, size_t size, int type)
579{
580 struct gfs2_inode *ip = GFS2_I(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
603static int gfs2_xattr_get(const struct xattr_handler *handler,
604 struct dentry *unused, struct inode *inode,
605 const char *name, void *buffer, size_t size)
606{
607 struct gfs2_inode *ip = GFS2_I(inode);
608 struct gfs2_holder gh;
609 int ret;
610
611 /* During lookup, SELinux calls this function with the glock locked. */
612
613 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
614 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
615 if (ret)
616 return ret;
617 } else {
618 gfs2_holder_mark_uninitialized(&gh);
619 }
620 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
621 if (gfs2_holder_initialized(&gh))
622 gfs2_glock_dq_uninit(&gh);
623 return ret;
624}
625
626/**
627 * ea_alloc_blk - allocates a new block for extended attributes.
628 * @ip: A pointer to the inode that's getting extended attributes
629 * @bhp: Pointer to pointer to a struct buffer_head
630 *
631 * Returns: errno
632 */
633
634static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
635{
636 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
637 struct gfs2_ea_header *ea;
638 unsigned int n = 1;
639 u64 block;
640 int error;
641
642 error = gfs2_alloc_blocks(ip, &block, &n, 0);
643 if (error)
644 return error;
645 gfs2_trans_remove_revoke(sdp, block, 1);
646 *bhp = gfs2_meta_new(ip->i_gl, block);
647 gfs2_trans_add_meta(ip->i_gl, *bhp);
648 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
649 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
650
651 ea = GFS2_EA_BH2FIRST(*bhp);
652 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
653 ea->ea_type = GFS2_EATYPE_UNUSED;
654 ea->ea_flags = GFS2_EAFLAG_LAST;
655 ea->ea_num_ptrs = 0;
656
657 gfs2_add_inode_blocks(&ip->i_inode, 1);
658
659 return 0;
660}
661
662/**
663 * ea_write - writes the request info to an ea, creating new blocks if
664 * necessary
665 * @ip: inode that is being modified
666 * @ea: the location of the new ea in a block
667 * @er: the write request
668 *
669 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
670 *
671 * returns : errno
672 */
673
674static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
675 struct gfs2_ea_request *er)
676{
677 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
678 int error;
679
680 ea->ea_data_len = cpu_to_be32(er->er_data_len);
681 ea->ea_name_len = er->er_name_len;
682 ea->ea_type = er->er_type;
683 ea->__pad = 0;
684
685 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
686
687 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
688 ea->ea_num_ptrs = 0;
689 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
690 } else {
691 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
692 const char *data = er->er_data;
693 unsigned int data_len = er->er_data_len;
694 unsigned int copy;
695 unsigned int x;
696
697 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
698 for (x = 0; x < ea->ea_num_ptrs; x++) {
699 struct buffer_head *bh;
700 u64 block;
701 int mh_size = sizeof(struct gfs2_meta_header);
702 unsigned int n = 1;
703
704 error = gfs2_alloc_blocks(ip, &block, &n, 0);
705 if (error)
706 return error;
707 gfs2_trans_remove_revoke(sdp, block, 1);
708 bh = gfs2_meta_new(ip->i_gl, block);
709 gfs2_trans_add_meta(ip->i_gl, bh);
710 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
711
712 gfs2_add_inode_blocks(&ip->i_inode, 1);
713
714 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
715 data_len;
716 memcpy(bh->b_data + mh_size, data, copy);
717 if (copy < sdp->sd_jbsize)
718 memset(bh->b_data + mh_size + copy, 0,
719 sdp->sd_jbsize - copy);
720
721 *dataptr++ = cpu_to_be64(bh->b_blocknr);
722 data += copy;
723 data_len -= copy;
724
725 brelse(bh);
726 }
727
728 gfs2_assert_withdraw(sdp, !data_len);
729 }
730
731 return 0;
732}
733
734typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
735 struct gfs2_ea_request *er, void *private);
736
737static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
738 unsigned int blks,
739 ea_skeleton_call_t skeleton_call, void *private)
740{
741 struct gfs2_alloc_parms ap = { .target = blks };
742 int error;
743
744 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
745 if (error)
746 return error;
747
748 error = gfs2_quota_lock_check(ip, &ap);
749 if (error)
750 return error;
751
752 error = gfs2_inplace_reserve(ip, &ap);
753 if (error)
754 goto out_gunlock_q;
755
756 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
757 blks + gfs2_rg_blocks(ip, blks) +
758 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
759 if (error)
760 goto out_ipres;
761
762 error = skeleton_call(ip, er, private);
763 if (error)
764 goto out_end_trans;
765
766 inode_set_ctime_current(&ip->i_inode);
767 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
768
769out_end_trans:
770 gfs2_trans_end(GFS2_SB(&ip->i_inode));
771out_ipres:
772 gfs2_inplace_release(ip);
773out_gunlock_q:
774 gfs2_quota_unlock(ip);
775 return error;
776}
777
778static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
779 void *private)
780{
781 struct buffer_head *bh;
782 int error;
783
784 error = ea_alloc_blk(ip, &bh);
785 if (error)
786 return error;
787
788 ip->i_eattr = bh->b_blocknr;
789 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
790
791 brelse(bh);
792
793 return error;
794}
795
796/*
797 * ea_init - initializes a new eattr block
798 *
799 * Returns: errno
800 */
801static int ea_init(struct gfs2_inode *ip, int type, const char *name,
802 const void *data, size_t size)
803{
804 struct gfs2_ea_request er;
805 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
806 unsigned int blks = 1;
807
808 er.er_type = type;
809 er.er_name = name;
810 er.er_name_len = strlen(name);
811 er.er_data = (void *)data;
812 er.er_data_len = size;
813
814 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
815 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
816
817 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
818}
819
820static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
821{
822 u32 ea_size = GFS2_EA_SIZE(ea);
823 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
824 ea_size);
825 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
826 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
827
828 ea->ea_rec_len = cpu_to_be32(ea_size);
829 ea->ea_flags ^= last;
830
831 new->ea_rec_len = cpu_to_be32(new_size);
832 new->ea_flags = last;
833
834 return new;
835}
836
837static void ea_set_remove_stuffed(struct gfs2_inode *ip,
838 struct gfs2_ea_location *el)
839{
840 struct gfs2_ea_header *ea = el->el_ea;
841 struct gfs2_ea_header *prev = el->el_prev;
842 u32 len;
843
844 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
845
846 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
847 ea->ea_type = GFS2_EATYPE_UNUSED;
848 return;
849 } else if (GFS2_EA2NEXT(prev) != ea) {
850 prev = GFS2_EA2NEXT(prev);
851 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
852 }
853
854 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
855 prev->ea_rec_len = cpu_to_be32(len);
856
857 if (GFS2_EA_IS_LAST(ea))
858 prev->ea_flags |= GFS2_EAFLAG_LAST;
859}
860
861struct ea_set {
862 int ea_split;
863
864 struct gfs2_ea_request *es_er;
865 struct gfs2_ea_location *es_el;
866
867 struct buffer_head *es_bh;
868 struct gfs2_ea_header *es_ea;
869};
870
871static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
872 struct gfs2_ea_header *ea, struct ea_set *es)
873{
874 struct gfs2_ea_request *er = es->es_er;
875 int error;
876
877 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
878 if (error)
879 return error;
880
881 gfs2_trans_add_meta(ip->i_gl, bh);
882
883 if (es->ea_split)
884 ea = ea_split_ea(ea);
885
886 ea_write(ip, ea, er);
887
888 if (es->es_el)
889 ea_set_remove_stuffed(ip, es->es_el);
890
891 inode_set_ctime_current(&ip->i_inode);
892 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
893
894 gfs2_trans_end(GFS2_SB(&ip->i_inode));
895 return error;
896}
897
898static int ea_set_simple_alloc(struct gfs2_inode *ip,
899 struct gfs2_ea_request *er, void *private)
900{
901 struct ea_set *es = private;
902 struct gfs2_ea_header *ea = es->es_ea;
903 int error;
904
905 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
906
907 if (es->ea_split)
908 ea = ea_split_ea(ea);
909
910 error = ea_write(ip, ea, er);
911 if (error)
912 return error;
913
914 if (es->es_el)
915 ea_set_remove_stuffed(ip, es->es_el);
916
917 return 0;
918}
919
920static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
921 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
922 void *private)
923{
924 struct ea_set *es = private;
925 unsigned int size;
926 int stuffed;
927 int error;
928
929 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
930 es->es_er->er_data_len, &size);
931
932 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
933 if (GFS2_EA_REC_LEN(ea) < size)
934 return 0;
935 if (!GFS2_EA_IS_STUFFED(ea)) {
936 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
937 if (error)
938 return error;
939 }
940 es->ea_split = 0;
941 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
942 es->ea_split = 1;
943 else
944 return 0;
945
946 if (stuffed) {
947 error = ea_set_simple_noalloc(ip, bh, ea, es);
948 if (error)
949 return error;
950 } else {
951 unsigned int blks;
952
953 es->es_bh = bh;
954 es->es_ea = ea;
955 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
956 GFS2_SB(&ip->i_inode)->sd_jbsize);
957
958 error = ea_alloc_skeleton(ip, es->es_er, blks,
959 ea_set_simple_alloc, es);
960 if (error)
961 return error;
962 }
963
964 return 1;
965}
966
967static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
968 void *private)
969{
970 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
971 struct buffer_head *indbh, *newbh;
972 __be64 *eablk;
973 int error;
974 int mh_size = sizeof(struct gfs2_meta_header);
975
976 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
977 __be64 *end;
978
979 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
980 &indbh);
981 if (error)
982 return error;
983
984 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
985 error = -EIO;
986 goto out;
987 }
988
989 eablk = (__be64 *)(indbh->b_data + mh_size);
990 end = eablk + sdp->sd_inptrs;
991
992 for (; eablk < end; eablk++)
993 if (!*eablk)
994 break;
995
996 if (eablk == end) {
997 error = -ENOSPC;
998 goto out;
999 }
1000
1001 gfs2_trans_add_meta(ip->i_gl, indbh);
1002 } else {
1003 u64 blk;
1004 unsigned int n = 1;
1005 error = gfs2_alloc_blocks(ip, &blk, &n, 0);
1006 if (error)
1007 return error;
1008 gfs2_trans_remove_revoke(sdp, blk, 1);
1009 indbh = gfs2_meta_new(ip->i_gl, blk);
1010 gfs2_trans_add_meta(ip->i_gl, indbh);
1011 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1012 gfs2_buffer_clear_tail(indbh, mh_size);
1013
1014 eablk = (__be64 *)(indbh->b_data + mh_size);
1015 *eablk = cpu_to_be64(ip->i_eattr);
1016 ip->i_eattr = blk;
1017 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1018 gfs2_add_inode_blocks(&ip->i_inode, 1);
1019
1020 eablk++;
1021 }
1022
1023 error = ea_alloc_blk(ip, &newbh);
1024 if (error)
1025 goto out;
1026
1027 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1028 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1029 brelse(newbh);
1030 if (error)
1031 goto out;
1032
1033 if (private)
1034 ea_set_remove_stuffed(ip, private);
1035
1036out:
1037 brelse(indbh);
1038 return error;
1039}
1040
1041static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1042 const void *value, size_t size, struct gfs2_ea_location *el)
1043{
1044 struct gfs2_ea_request er;
1045 struct ea_set es;
1046 unsigned int blks = 2;
1047 int error;
1048
1049 er.er_type = type;
1050 er.er_name = name;
1051 er.er_data = (void *)value;
1052 er.er_name_len = strlen(name);
1053 er.er_data_len = size;
1054
1055 memset(&es, 0, sizeof(struct ea_set));
1056 es.es_er = &er;
1057 es.es_el = el;
1058
1059 error = ea_foreach(ip, ea_set_simple, &es);
1060 if (error > 0)
1061 return 0;
1062 if (error)
1063 return error;
1064
1065 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1066 blks++;
1067 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1068 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1069
1070 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1071}
1072
1073static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1074 struct gfs2_ea_location *el)
1075{
1076 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1077 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1078 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1079 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1080 }
1081
1082 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1083}
1084
1085static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1086{
1087 struct gfs2_ea_header *ea = el->el_ea;
1088 struct gfs2_ea_header *prev = el->el_prev;
1089 int error;
1090
1091 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1092 if (error)
1093 return error;
1094
1095 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1096
1097 if (prev) {
1098 u32 len;
1099
1100 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1101 prev->ea_rec_len = cpu_to_be32(len);
1102
1103 if (GFS2_EA_IS_LAST(ea))
1104 prev->ea_flags |= GFS2_EAFLAG_LAST;
1105 } else {
1106 ea->ea_type = GFS2_EATYPE_UNUSED;
1107 }
1108
1109 inode_set_ctime_current(&ip->i_inode);
1110 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1111
1112 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1113
1114 return error;
1115}
1116
1117/**
1118 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1119 * @ip: The inode
1120 * @type: The type of the extended attribute
1121 * @name: The name of the extended attribute
1122 *
1123 * This is not called directly by the VFS since we use the (common)
1124 * scheme of making a "set with NULL data" mean a remove request. Note
1125 * that this is different from a set with zero length data.
1126 *
1127 * Returns: 0, or errno on failure
1128 */
1129
1130static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1131{
1132 struct gfs2_ea_location el;
1133 int error;
1134
1135 if (!ip->i_eattr)
1136 return -ENODATA;
1137
1138 error = gfs2_ea_find(ip, type, name, &el);
1139 if (error)
1140 return error;
1141 if (!el.el_ea)
1142 return -ENODATA;
1143
1144 if (GFS2_EA_IS_STUFFED(el.el_ea))
1145 error = ea_remove_stuffed(ip, &el);
1146 else
1147 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1148
1149 brelse(el.el_bh);
1150
1151 return error;
1152}
1153
1154/**
1155 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1156 * @inode: The inode
1157 * @name: The name of the extended attribute
1158 * @value: The value of the extended attribute (NULL for remove)
1159 * @size: The size of the @value argument
1160 * @flags: Create or Replace
1161 * @type: The type of the extended attribute
1162 *
1163 * See gfs2_xattr_remove() for details of the removal of xattrs.
1164 *
1165 * Returns: 0 or errno on failure
1166 */
1167
1168int __gfs2_xattr_set(struct inode *inode, const char *name,
1169 const void *value, size_t size, int flags, int type)
1170{
1171 struct gfs2_inode *ip = GFS2_I(inode);
1172 struct gfs2_sbd *sdp = GFS2_SB(inode);
1173 struct gfs2_ea_location el;
1174 unsigned int namel = strlen(name);
1175 int error;
1176
1177 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1178 return -EPERM;
1179 if (namel > GFS2_EA_MAX_NAME_LEN)
1180 return -ERANGE;
1181
1182 if (value == NULL) {
1183 error = gfs2_xattr_remove(ip, type, name);
1184 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1185 error = 0;
1186 return error;
1187 }
1188
1189 if (ea_check_size(sdp, namel, size))
1190 return -ERANGE;
1191
1192 if (!ip->i_eattr) {
1193 if (flags & XATTR_REPLACE)
1194 return -ENODATA;
1195 return ea_init(ip, type, name, value, size);
1196 }
1197
1198 error = gfs2_ea_find(ip, type, name, &el);
1199 if (error)
1200 return error;
1201
1202 if (el.el_ea) {
1203 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1204 brelse(el.el_bh);
1205 return -EPERM;
1206 }
1207
1208 error = -EEXIST;
1209 if (!(flags & XATTR_CREATE)) {
1210 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1211 error = ea_set_i(ip, type, name, value, size, &el);
1212 if (!error && unstuffed)
1213 ea_set_remove_unstuffed(ip, &el);
1214 }
1215
1216 brelse(el.el_bh);
1217 return error;
1218 }
1219
1220 error = -ENODATA;
1221 if (!(flags & XATTR_REPLACE))
1222 error = ea_set_i(ip, type, name, value, size, NULL);
1223
1224 return error;
1225}
1226
1227static int gfs2_xattr_set(const struct xattr_handler *handler,
1228 struct mnt_idmap *idmap,
1229 struct dentry *unused, struct inode *inode,
1230 const char *name, const void *value,
1231 size_t size, int flags)
1232{
1233 struct gfs2_inode *ip = GFS2_I(inode);
1234 struct gfs2_holder gh;
1235 int ret;
1236
1237 ret = gfs2_qa_get(ip);
1238 if (ret)
1239 return ret;
1240
1241 /* May be called from gfs_setattr with the glock locked. */
1242
1243 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1244 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1245 if (ret)
1246 goto out;
1247 } else {
1248 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1249 ret = -EIO;
1250 goto out;
1251 }
1252 gfs2_holder_mark_uninitialized(&gh);
1253 }
1254 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1255 if (gfs2_holder_initialized(&gh))
1256 gfs2_glock_dq_uninit(&gh);
1257out:
1258 gfs2_qa_put(ip);
1259 return ret;
1260}
1261
1262static int ea_dealloc_indirect(struct gfs2_inode *ip)
1263{
1264 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1265 struct gfs2_rgrp_list rlist;
1266 struct gfs2_rgrpd *rgd;
1267 struct buffer_head *indbh, *dibh;
1268 __be64 *eablk, *end;
1269 unsigned int rg_blocks = 0;
1270 u64 bstart = 0;
1271 unsigned int blen = 0;
1272 unsigned int blks = 0;
1273 unsigned int x;
1274 int error;
1275
1276 error = gfs2_rindex_update(sdp);
1277 if (error)
1278 return error;
1279
1280 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1281
1282 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1283 if (error)
1284 return error;
1285
1286 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1287 error = -EIO;
1288 goto out;
1289 }
1290
1291 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1292 end = eablk + sdp->sd_inptrs;
1293
1294 for (; eablk < end; eablk++) {
1295 u64 bn;
1296
1297 if (!*eablk)
1298 break;
1299 bn = be64_to_cpu(*eablk);
1300
1301 if (bstart + blen == bn)
1302 blen++;
1303 else {
1304 if (bstart)
1305 gfs2_rlist_add(ip, &rlist, bstart);
1306 bstart = bn;
1307 blen = 1;
1308 }
1309 blks++;
1310 }
1311 if (bstart)
1312 gfs2_rlist_add(ip, &rlist, bstart);
1313 else
1314 goto out;
1315
1316 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE);
1317
1318 for (x = 0; x < rlist.rl_rgrps; x++) {
1319 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1320 rg_blocks += rgd->rd_length;
1321 }
1322
1323 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1324 if (error)
1325 goto out_rlist_free;
1326
1327 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1328 RES_STATFS + RES_QUOTA, blks);
1329 if (error)
1330 goto out_gunlock;
1331
1332 gfs2_trans_add_meta(ip->i_gl, indbh);
1333
1334 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1335 bstart = 0;
1336 rgd = NULL;
1337 blen = 0;
1338
1339 for (; eablk < end; eablk++) {
1340 u64 bn;
1341
1342 if (!*eablk)
1343 break;
1344 bn = be64_to_cpu(*eablk);
1345
1346 if (bstart + blen == bn)
1347 blen++;
1348 else {
1349 if (bstart)
1350 gfs2_free_meta(ip, rgd, bstart, blen);
1351 bstart = bn;
1352 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1353 blen = 1;
1354 }
1355
1356 *eablk = 0;
1357 gfs2_add_inode_blocks(&ip->i_inode, -1);
1358 }
1359 if (bstart)
1360 gfs2_free_meta(ip, rgd, bstart, blen);
1361
1362 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1363
1364 error = gfs2_meta_inode_buffer(ip, &dibh);
1365 if (!error) {
1366 gfs2_trans_add_meta(ip->i_gl, dibh);
1367 gfs2_dinode_out(ip, dibh->b_data);
1368 brelse(dibh);
1369 }
1370
1371 gfs2_trans_end(sdp);
1372
1373out_gunlock:
1374 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1375out_rlist_free:
1376 gfs2_rlist_free(&rlist);
1377out:
1378 brelse(indbh);
1379 return error;
1380}
1381
1382static int ea_dealloc_block(struct gfs2_inode *ip)
1383{
1384 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1385 struct gfs2_rgrpd *rgd;
1386 struct buffer_head *dibh;
1387 struct gfs2_holder gh;
1388 int error;
1389
1390 error = gfs2_rindex_update(sdp);
1391 if (error)
1392 return error;
1393
1394 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1395 if (!rgd) {
1396 gfs2_consist_inode(ip);
1397 return -EIO;
1398 }
1399
1400 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1401 LM_FLAG_NODE_SCOPE, &gh);
1402 if (error)
1403 return error;
1404
1405 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1406 RES_QUOTA, 1);
1407 if (error)
1408 goto out_gunlock;
1409
1410 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1411
1412 ip->i_eattr = 0;
1413 gfs2_add_inode_blocks(&ip->i_inode, -1);
1414
1415 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1416 error = gfs2_meta_inode_buffer(ip, &dibh);
1417 if (!error) {
1418 gfs2_trans_add_meta(ip->i_gl, dibh);
1419 gfs2_dinode_out(ip, dibh->b_data);
1420 brelse(dibh);
1421 }
1422 }
1423
1424 gfs2_trans_end(sdp);
1425
1426out_gunlock:
1427 gfs2_glock_dq_uninit(&gh);
1428 return error;
1429}
1430
1431/**
1432 * gfs2_ea_dealloc - deallocate the extended attribute fork
1433 * @ip: the inode
1434 *
1435 * Returns: errno
1436 */
1437
1438int gfs2_ea_dealloc(struct gfs2_inode *ip)
1439{
1440 int error;
1441
1442 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1443 if (error)
1444 return error;
1445
1446 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1447 if (error)
1448 return error;
1449
1450 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1451 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1452 if (error)
1453 goto out_quota;
1454
1455 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1456 error = ea_dealloc_indirect(ip);
1457 if (error)
1458 goto out_quota;
1459 }
1460 }
1461
1462 error = ea_dealloc_block(ip);
1463
1464out_quota:
1465 gfs2_quota_unhold(ip);
1466 return error;
1467}
1468
1469static const struct xattr_handler gfs2_xattr_user_handler = {
1470 .prefix = XATTR_USER_PREFIX,
1471 .flags = GFS2_EATYPE_USR,
1472 .get = gfs2_xattr_get,
1473 .set = gfs2_xattr_set,
1474};
1475
1476static const struct xattr_handler gfs2_xattr_security_handler = {
1477 .prefix = XATTR_SECURITY_PREFIX,
1478 .flags = GFS2_EATYPE_SECURITY,
1479 .get = gfs2_xattr_get,
1480 .set = gfs2_xattr_set,
1481};
1482
1483static bool
1484gfs2_xattr_trusted_list(struct dentry *dentry)
1485{
1486 return capable(CAP_SYS_ADMIN);
1487}
1488
1489static const struct xattr_handler gfs2_xattr_trusted_handler = {
1490 .prefix = XATTR_TRUSTED_PREFIX,
1491 .flags = GFS2_EATYPE_TRUSTED,
1492 .list = gfs2_xattr_trusted_list,
1493 .get = gfs2_xattr_get,
1494 .set = gfs2_xattr_set,
1495};
1496
1497const struct xattr_handler * const gfs2_xattr_handlers_max[] = {
1498 /* GFS2_FS_FORMAT_MAX */
1499 &gfs2_xattr_trusted_handler,
1500
1501 /* GFS2_FS_FORMAT_MIN */
1502 &gfs2_xattr_user_handler,
1503 &gfs2_xattr_security_handler,
1504 NULL,
1505};
1506
1507const struct xattr_handler * const *gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;