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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 <linux/posix_acl_xattr.h>
17#include <asm/uaccess.h>
18
19#include "gfs2.h"
20#include "incore.h"
21#include "acl.h"
22#include "xattr.h"
23#include "glock.h"
24#include "inode.h"
25#include "meta_io.h"
26#include "quota.h"
27#include "rgrp.h"
28#include "trans.h"
29#include "util.h"
30
31/**
32 * ea_calc_size - returns the acutal number of bytes the request will take up
33 * (not counting any unstuffed data blocks)
34 * @sdp:
35 * @er:
36 * @size:
37 *
38 * Returns: 1 if the EA should be stuffed
39 */
40
41static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
42 unsigned int *size)
43{
44 unsigned int jbsize = sdp->sd_jbsize;
45
46 /* Stuffed */
47 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
48
49 if (*size <= jbsize)
50 return 1;
51
52 /* Unstuffed */
53 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
54 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
55
56 return 0;
57}
58
59static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
60{
61 unsigned int size;
62
63 if (dsize > GFS2_EA_MAX_DATA_LEN)
64 return -ERANGE;
65
66 ea_calc_size(sdp, nsize, dsize, &size);
67
68 /* This can only happen with 512 byte blocks */
69 if (size > sdp->sd_jbsize)
70 return -ERANGE;
71
72 return 0;
73}
74
75typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
76 struct gfs2_ea_header *ea,
77 struct gfs2_ea_header *prev, void *private);
78
79static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
80 ea_call_t ea_call, void *data)
81{
82 struct gfs2_ea_header *ea, *prev = NULL;
83 int error = 0;
84
85 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
86 return -EIO;
87
88 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
89 if (!GFS2_EA_REC_LEN(ea))
90 goto fail;
91 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
92 bh->b_data + bh->b_size))
93 goto fail;
94 if (!GFS2_EATYPE_VALID(ea->ea_type))
95 goto fail;
96
97 error = ea_call(ip, bh, ea, prev, data);
98 if (error)
99 return error;
100
101 if (GFS2_EA_IS_LAST(ea)) {
102 if ((char *)GFS2_EA2NEXT(ea) !=
103 bh->b_data + bh->b_size)
104 goto fail;
105 break;
106 }
107 }
108
109 return error;
110
111fail:
112 gfs2_consist_inode(ip);
113 return -EIO;
114}
115
116static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
117{
118 struct buffer_head *bh, *eabh;
119 __be64 *eablk, *end;
120 int error;
121
122 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
123 if (error)
124 return error;
125
126 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
127 error = ea_foreach_i(ip, bh, ea_call, data);
128 goto out;
129 }
130
131 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
132 error = -EIO;
133 goto out;
134 }
135
136 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
137 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
138
139 for (; eablk < end; eablk++) {
140 u64 bn;
141
142 if (!*eablk)
143 break;
144 bn = be64_to_cpu(*eablk);
145
146 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
147 if (error)
148 break;
149 error = ea_foreach_i(ip, eabh, ea_call, data);
150 brelse(eabh);
151 if (error)
152 break;
153 }
154out:
155 brelse(bh);
156 return error;
157}
158
159struct ea_find {
160 int type;
161 const char *name;
162 size_t namel;
163 struct gfs2_ea_location *ef_el;
164};
165
166static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
167 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
168 void *private)
169{
170 struct ea_find *ef = private;
171
172 if (ea->ea_type == GFS2_EATYPE_UNUSED)
173 return 0;
174
175 if (ea->ea_type == ef->type) {
176 if (ea->ea_name_len == ef->namel &&
177 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
178 struct gfs2_ea_location *el = ef->ef_el;
179 get_bh(bh);
180 el->el_bh = bh;
181 el->el_ea = ea;
182 el->el_prev = prev;
183 return 1;
184 }
185 }
186
187 return 0;
188}
189
190static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
191 struct gfs2_ea_location *el)
192{
193 struct ea_find ef;
194 int error;
195
196 ef.type = type;
197 ef.name = name;
198 ef.namel = strlen(name);
199 ef.ef_el = el;
200
201 memset(el, 0, sizeof(struct gfs2_ea_location));
202
203 error = ea_foreach(ip, ea_find_i, &ef);
204 if (error > 0)
205 return 0;
206
207 return error;
208}
209
210/**
211 * ea_dealloc_unstuffed -
212 * @ip:
213 * @bh:
214 * @ea:
215 * @prev:
216 * @private:
217 *
218 * Take advantage of the fact that all unstuffed blocks are
219 * allocated from the same RG. But watch, this may not always
220 * be true.
221 *
222 * Returns: errno
223 */
224
225static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
226 struct gfs2_ea_header *ea,
227 struct gfs2_ea_header *prev, void *private)
228{
229 int *leave = private;
230 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
231 struct gfs2_rgrpd *rgd;
232 struct gfs2_holder rg_gh;
233 struct buffer_head *dibh;
234 __be64 *dataptrs;
235 u64 bn = 0;
236 u64 bstart = 0;
237 unsigned int blen = 0;
238 unsigned int blks = 0;
239 unsigned int x;
240 int error;
241
242 error = gfs2_rindex_update(sdp);
243 if (error)
244 return error;
245
246 if (GFS2_EA_IS_STUFFED(ea))
247 return 0;
248
249 dataptrs = GFS2_EA2DATAPTRS(ea);
250 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
251 if (*dataptrs) {
252 blks++;
253 bn = be64_to_cpu(*dataptrs);
254 }
255 }
256 if (!blks)
257 return 0;
258
259 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
260 if (!rgd) {
261 gfs2_consist_inode(ip);
262 return -EIO;
263 }
264
265 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
266 if (error)
267 return error;
268
269 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
270 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
271 if (error)
272 goto out_gunlock;
273
274 gfs2_trans_add_meta(ip->i_gl, bh);
275
276 dataptrs = GFS2_EA2DATAPTRS(ea);
277 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
278 if (!*dataptrs)
279 break;
280 bn = be64_to_cpu(*dataptrs);
281
282 if (bstart + blen == bn)
283 blen++;
284 else {
285 if (bstart)
286 gfs2_free_meta(ip, bstart, blen);
287 bstart = bn;
288 blen = 1;
289 }
290
291 *dataptrs = 0;
292 gfs2_add_inode_blocks(&ip->i_inode, -1);
293 }
294 if (bstart)
295 gfs2_free_meta(ip, bstart, blen);
296
297 if (prev && !leave) {
298 u32 len;
299
300 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
301 prev->ea_rec_len = cpu_to_be32(len);
302
303 if (GFS2_EA_IS_LAST(ea))
304 prev->ea_flags |= GFS2_EAFLAG_LAST;
305 } else {
306 ea->ea_type = GFS2_EATYPE_UNUSED;
307 ea->ea_num_ptrs = 0;
308 }
309
310 error = gfs2_meta_inode_buffer(ip, &dibh);
311 if (!error) {
312 ip->i_inode.i_ctime = CURRENT_TIME;
313 gfs2_trans_add_meta(ip->i_gl, dibh);
314 gfs2_dinode_out(ip, dibh->b_data);
315 brelse(dibh);
316 }
317
318 gfs2_trans_end(sdp);
319
320out_gunlock:
321 gfs2_glock_dq_uninit(&rg_gh);
322 return error;
323}
324
325static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
326 struct gfs2_ea_header *ea,
327 struct gfs2_ea_header *prev, int leave)
328{
329 int error;
330
331 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
332 if (error)
333 return error;
334
335 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
336 if (error)
337 goto out_alloc;
338
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340
341 gfs2_quota_unhold(ip);
342out_alloc:
343 return error;
344}
345
346struct ea_list {
347 struct gfs2_ea_request *ei_er;
348 unsigned int ei_size;
349};
350
351static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
352{
353 switch (ea->ea_type) {
354 case GFS2_EATYPE_USR:
355 return 5 + ea->ea_name_len + 1;
356 case GFS2_EATYPE_SYS:
357 return 7 + ea->ea_name_len + 1;
358 case GFS2_EATYPE_SECURITY:
359 return 9 + ea->ea_name_len + 1;
360 default:
361 return 0;
362 }
363}
364
365static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
366 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
367 void *private)
368{
369 struct ea_list *ei = private;
370 struct gfs2_ea_request *er = ei->ei_er;
371 unsigned int ea_size = gfs2_ea_strlen(ea);
372
373 if (ea->ea_type == GFS2_EATYPE_UNUSED)
374 return 0;
375
376 if (er->er_data_len) {
377 char *prefix = NULL;
378 unsigned int l = 0;
379 char c = 0;
380
381 if (ei->ei_size + ea_size > er->er_data_len)
382 return -ERANGE;
383
384 switch (ea->ea_type) {
385 case GFS2_EATYPE_USR:
386 prefix = "user.";
387 l = 5;
388 break;
389 case GFS2_EATYPE_SYS:
390 prefix = "system.";
391 l = 7;
392 break;
393 case GFS2_EATYPE_SECURITY:
394 prefix = "security.";
395 l = 9;
396 break;
397 }
398
399 BUG_ON(l == 0);
400
401 memcpy(er->er_data + ei->ei_size, prefix, l);
402 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
403 ea->ea_name_len);
404 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
405 }
406
407 ei->ei_size += ea_size;
408
409 return 0;
410}
411
412/**
413 * gfs2_listxattr - List gfs2 extended attributes
414 * @dentry: The dentry whose inode we are interested in
415 * @buffer: The buffer to write the results
416 * @size: The size of the buffer
417 *
418 * Returns: actual size of data on success, -errno on error
419 */
420
421ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
422{
423 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
424 struct gfs2_ea_request er;
425 struct gfs2_holder i_gh;
426 int error;
427
428 memset(&er, 0, sizeof(struct gfs2_ea_request));
429 if (size) {
430 er.er_data = buffer;
431 er.er_data_len = size;
432 }
433
434 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
435 if (error)
436 return error;
437
438 if (ip->i_eattr) {
439 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
440
441 error = ea_foreach(ip, ea_list_i, &ei);
442 if (!error)
443 error = ei.ei_size;
444 }
445
446 gfs2_glock_dq_uninit(&i_gh);
447
448 return error;
449}
450
451/**
452 * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
453 * request buffer
454 * @ip: The GFS2 inode
455 * @ea: The extended attribute header structure
456 * @din: The data to be copied in
457 * @dout: The data to be copied out (one of din,dout will be NULL)
458 *
459 * Returns: errno
460 */
461
462static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
463 const char *din, char *dout)
464{
465 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
466 struct buffer_head **bh;
467 unsigned int amount = GFS2_EA_DATA_LEN(ea);
468 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
469 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
470 unsigned int x;
471 int error = 0;
472 unsigned char *pos;
473 unsigned cp_size;
474
475 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
476 if (!bh)
477 return -ENOMEM;
478
479 for (x = 0; x < nptrs; x++) {
480 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
481 bh + x);
482 if (error) {
483 while (x--)
484 brelse(bh[x]);
485 goto out;
486 }
487 dataptrs++;
488 }
489
490 for (x = 0; x < nptrs; x++) {
491 error = gfs2_meta_wait(sdp, bh[x]);
492 if (error) {
493 for (; x < nptrs; x++)
494 brelse(bh[x]);
495 goto out;
496 }
497 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
498 for (; x < nptrs; x++)
499 brelse(bh[x]);
500 error = -EIO;
501 goto out;
502 }
503
504 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
505 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
506
507 if (dout) {
508 memcpy(dout, pos, cp_size);
509 dout += sdp->sd_jbsize;
510 }
511
512 if (din) {
513 gfs2_trans_add_meta(ip->i_gl, bh[x]);
514 memcpy(pos, din, cp_size);
515 din += sdp->sd_jbsize;
516 }
517
518 amount -= sdp->sd_jbsize;
519 brelse(bh[x]);
520 }
521
522out:
523 kfree(bh);
524 return error;
525}
526
527static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
528 char *data, size_t size)
529{
530 int ret;
531 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
532 if (len > size)
533 return -ERANGE;
534
535 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
536 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
537 return len;
538 }
539 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
540 if (ret < 0)
541 return ret;
542 return len;
543}
544
545int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
546{
547 struct gfs2_ea_location el;
548 int error;
549 int len;
550 char *data;
551
552 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
553 if (error)
554 return error;
555 if (!el.el_ea)
556 goto out;
557 if (!GFS2_EA_DATA_LEN(el.el_ea))
558 goto out;
559
560 len = GFS2_EA_DATA_LEN(el.el_ea);
561 data = kmalloc(len, GFP_NOFS);
562 error = -ENOMEM;
563 if (data == NULL)
564 goto out;
565
566 error = gfs2_ea_get_copy(ip, &el, data, len);
567 if (error < 0)
568 kfree(data);
569 else
570 *ppdata = data;
571out:
572 brelse(el.el_bh);
573 return error;
574}
575
576/**
577 * gfs2_xattr_get - Get a GFS2 extended attribute
578 * @inode: The inode
579 * @name: The name of the extended attribute
580 * @buffer: The buffer to write the result into
581 * @size: The size of the buffer
582 * @type: The type of extended attribute
583 *
584 * Returns: actual size of data on success, -errno on error
585 */
586static int gfs2_xattr_get(const struct xattr_handler *handler,
587 struct dentry *dentry, const char *name,
588 void *buffer, size_t size)
589{
590 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
591 struct gfs2_ea_location el;
592 int type = handler->flags;
593 int error;
594
595 if (!ip->i_eattr)
596 return -ENODATA;
597 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
598 return -EINVAL;
599
600 error = gfs2_ea_find(ip, type, name, &el);
601 if (error)
602 return error;
603 if (!el.el_ea)
604 return -ENODATA;
605 if (size)
606 error = gfs2_ea_get_copy(ip, &el, buffer, size);
607 else
608 error = GFS2_EA_DATA_LEN(el.el_ea);
609 brelse(el.el_bh);
610
611 return error;
612}
613
614/**
615 * ea_alloc_blk - allocates a new block for extended attributes.
616 * @ip: A pointer to the inode that's getting extended attributes
617 * @bhp: Pointer to pointer to a struct buffer_head
618 *
619 * Returns: errno
620 */
621
622static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
623{
624 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
625 struct gfs2_ea_header *ea;
626 unsigned int n = 1;
627 u64 block;
628 int error;
629
630 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
631 if (error)
632 return error;
633 gfs2_trans_add_unrevoke(sdp, block, 1);
634 *bhp = gfs2_meta_new(ip->i_gl, block);
635 gfs2_trans_add_meta(ip->i_gl, *bhp);
636 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
637 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
638
639 ea = GFS2_EA_BH2FIRST(*bhp);
640 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
641 ea->ea_type = GFS2_EATYPE_UNUSED;
642 ea->ea_flags = GFS2_EAFLAG_LAST;
643 ea->ea_num_ptrs = 0;
644
645 gfs2_add_inode_blocks(&ip->i_inode, 1);
646
647 return 0;
648}
649
650/**
651 * ea_write - writes the request info to an ea, creating new blocks if
652 * necessary
653 * @ip: inode that is being modified
654 * @ea: the location of the new ea in a block
655 * @er: the write request
656 *
657 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
658 *
659 * returns : errno
660 */
661
662static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
663 struct gfs2_ea_request *er)
664{
665 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
666 int error;
667
668 ea->ea_data_len = cpu_to_be32(er->er_data_len);
669 ea->ea_name_len = er->er_name_len;
670 ea->ea_type = er->er_type;
671 ea->__pad = 0;
672
673 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
674
675 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
676 ea->ea_num_ptrs = 0;
677 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
678 } else {
679 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
680 const char *data = er->er_data;
681 unsigned int data_len = er->er_data_len;
682 unsigned int copy;
683 unsigned int x;
684
685 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
686 for (x = 0; x < ea->ea_num_ptrs; x++) {
687 struct buffer_head *bh;
688 u64 block;
689 int mh_size = sizeof(struct gfs2_meta_header);
690 unsigned int n = 1;
691
692 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
693 if (error)
694 return error;
695 gfs2_trans_add_unrevoke(sdp, block, 1);
696 bh = gfs2_meta_new(ip->i_gl, block);
697 gfs2_trans_add_meta(ip->i_gl, bh);
698 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
699
700 gfs2_add_inode_blocks(&ip->i_inode, 1);
701
702 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
703 data_len;
704 memcpy(bh->b_data + mh_size, data, copy);
705 if (copy < sdp->sd_jbsize)
706 memset(bh->b_data + mh_size + copy, 0,
707 sdp->sd_jbsize - copy);
708
709 *dataptr++ = cpu_to_be64(bh->b_blocknr);
710 data += copy;
711 data_len -= copy;
712
713 brelse(bh);
714 }
715
716 gfs2_assert_withdraw(sdp, !data_len);
717 }
718
719 return 0;
720}
721
722typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
723 struct gfs2_ea_request *er, void *private);
724
725static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
726 unsigned int blks,
727 ea_skeleton_call_t skeleton_call, void *private)
728{
729 struct gfs2_alloc_parms ap = { .target = blks };
730 struct buffer_head *dibh;
731 int error;
732
733 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
734 if (error)
735 return error;
736
737 error = gfs2_quota_lock_check(ip, &ap);
738 if (error)
739 return error;
740
741 error = gfs2_inplace_reserve(ip, &ap);
742 if (error)
743 goto out_gunlock_q;
744
745 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
746 blks + gfs2_rg_blocks(ip, blks) +
747 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
748 if (error)
749 goto out_ipres;
750
751 error = skeleton_call(ip, er, private);
752 if (error)
753 goto out_end_trans;
754
755 error = gfs2_meta_inode_buffer(ip, &dibh);
756 if (!error) {
757 ip->i_inode.i_ctime = CURRENT_TIME;
758 gfs2_trans_add_meta(ip->i_gl, dibh);
759 gfs2_dinode_out(ip, dibh->b_data);
760 brelse(dibh);
761 }
762
763out_end_trans:
764 gfs2_trans_end(GFS2_SB(&ip->i_inode));
765out_ipres:
766 gfs2_inplace_release(ip);
767out_gunlock_q:
768 gfs2_quota_unlock(ip);
769 return error;
770}
771
772static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
773 void *private)
774{
775 struct buffer_head *bh;
776 int error;
777
778 error = ea_alloc_blk(ip, &bh);
779 if (error)
780 return error;
781
782 ip->i_eattr = bh->b_blocknr;
783 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
784
785 brelse(bh);
786
787 return error;
788}
789
790/**
791 * ea_init - initializes a new eattr block
792 * @ip:
793 * @er:
794 *
795 * Returns: errno
796 */
797
798static int ea_init(struct gfs2_inode *ip, int type, const char *name,
799 const void *data, size_t size)
800{
801 struct gfs2_ea_request er;
802 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
803 unsigned int blks = 1;
804
805 er.er_type = type;
806 er.er_name = name;
807 er.er_name_len = strlen(name);
808 er.er_data = (void *)data;
809 er.er_data_len = size;
810
811 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
812 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
813
814 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
815}
816
817static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
818{
819 u32 ea_size = GFS2_EA_SIZE(ea);
820 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
821 ea_size);
822 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
823 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
824
825 ea->ea_rec_len = cpu_to_be32(ea_size);
826 ea->ea_flags ^= last;
827
828 new->ea_rec_len = cpu_to_be32(new_size);
829 new->ea_flags = last;
830
831 return new;
832}
833
834static void ea_set_remove_stuffed(struct gfs2_inode *ip,
835 struct gfs2_ea_location *el)
836{
837 struct gfs2_ea_header *ea = el->el_ea;
838 struct gfs2_ea_header *prev = el->el_prev;
839 u32 len;
840
841 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
842
843 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
844 ea->ea_type = GFS2_EATYPE_UNUSED;
845 return;
846 } else if (GFS2_EA2NEXT(prev) != ea) {
847 prev = GFS2_EA2NEXT(prev);
848 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
849 }
850
851 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
852 prev->ea_rec_len = cpu_to_be32(len);
853
854 if (GFS2_EA_IS_LAST(ea))
855 prev->ea_flags |= GFS2_EAFLAG_LAST;
856}
857
858struct ea_set {
859 int ea_split;
860
861 struct gfs2_ea_request *es_er;
862 struct gfs2_ea_location *es_el;
863
864 struct buffer_head *es_bh;
865 struct gfs2_ea_header *es_ea;
866};
867
868static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
869 struct gfs2_ea_header *ea, struct ea_set *es)
870{
871 struct gfs2_ea_request *er = es->es_er;
872 struct buffer_head *dibh;
873 int error;
874
875 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
876 if (error)
877 return error;
878
879 gfs2_trans_add_meta(ip->i_gl, bh);
880
881 if (es->ea_split)
882 ea = ea_split_ea(ea);
883
884 ea_write(ip, ea, er);
885
886 if (es->es_el)
887 ea_set_remove_stuffed(ip, es->es_el);
888
889 error = gfs2_meta_inode_buffer(ip, &dibh);
890 if (error)
891 goto out;
892 ip->i_inode.i_ctime = CURRENT_TIME;
893 gfs2_trans_add_meta(ip->i_gl, dibh);
894 gfs2_dinode_out(ip, dibh->b_data);
895 brelse(dibh);
896out:
897 gfs2_trans_end(GFS2_SB(&ip->i_inode));
898 return error;
899}
900
901static int ea_set_simple_alloc(struct gfs2_inode *ip,
902 struct gfs2_ea_request *er, void *private)
903{
904 struct ea_set *es = private;
905 struct gfs2_ea_header *ea = es->es_ea;
906 int error;
907
908 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
909
910 if (es->ea_split)
911 ea = ea_split_ea(ea);
912
913 error = ea_write(ip, ea, er);
914 if (error)
915 return error;
916
917 if (es->es_el)
918 ea_set_remove_stuffed(ip, es->es_el);
919
920 return 0;
921}
922
923static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
924 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
925 void *private)
926{
927 struct ea_set *es = private;
928 unsigned int size;
929 int stuffed;
930 int error;
931
932 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
933 es->es_er->er_data_len, &size);
934
935 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
936 if (GFS2_EA_REC_LEN(ea) < size)
937 return 0;
938 if (!GFS2_EA_IS_STUFFED(ea)) {
939 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
940 if (error)
941 return error;
942 }
943 es->ea_split = 0;
944 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
945 es->ea_split = 1;
946 else
947 return 0;
948
949 if (stuffed) {
950 error = ea_set_simple_noalloc(ip, bh, ea, es);
951 if (error)
952 return error;
953 } else {
954 unsigned int blks;
955
956 es->es_bh = bh;
957 es->es_ea = ea;
958 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
959 GFS2_SB(&ip->i_inode)->sd_jbsize);
960
961 error = ea_alloc_skeleton(ip, es->es_er, blks,
962 ea_set_simple_alloc, es);
963 if (error)
964 return error;
965 }
966
967 return 1;
968}
969
970static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
971 void *private)
972{
973 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
974 struct buffer_head *indbh, *newbh;
975 __be64 *eablk;
976 int error;
977 int mh_size = sizeof(struct gfs2_meta_header);
978
979 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
980 __be64 *end;
981
982 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
983 &indbh);
984 if (error)
985 return error;
986
987 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
988 error = -EIO;
989 goto out;
990 }
991
992 eablk = (__be64 *)(indbh->b_data + mh_size);
993 end = eablk + sdp->sd_inptrs;
994
995 for (; eablk < end; eablk++)
996 if (!*eablk)
997 break;
998
999 if (eablk == end) {
1000 error = -ENOSPC;
1001 goto out;
1002 }
1003
1004 gfs2_trans_add_meta(ip->i_gl, indbh);
1005 } else {
1006 u64 blk;
1007 unsigned int n = 1;
1008 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1009 if (error)
1010 return error;
1011 gfs2_trans_add_unrevoke(sdp, blk, 1);
1012 indbh = gfs2_meta_new(ip->i_gl, blk);
1013 gfs2_trans_add_meta(ip->i_gl, indbh);
1014 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1015 gfs2_buffer_clear_tail(indbh, mh_size);
1016
1017 eablk = (__be64 *)(indbh->b_data + mh_size);
1018 *eablk = cpu_to_be64(ip->i_eattr);
1019 ip->i_eattr = blk;
1020 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1021 gfs2_add_inode_blocks(&ip->i_inode, 1);
1022
1023 eablk++;
1024 }
1025
1026 error = ea_alloc_blk(ip, &newbh);
1027 if (error)
1028 goto out;
1029
1030 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1031 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1032 brelse(newbh);
1033 if (error)
1034 goto out;
1035
1036 if (private)
1037 ea_set_remove_stuffed(ip, private);
1038
1039out:
1040 brelse(indbh);
1041 return error;
1042}
1043
1044static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1045 const void *value, size_t size, struct gfs2_ea_location *el)
1046{
1047 struct gfs2_ea_request er;
1048 struct ea_set es;
1049 unsigned int blks = 2;
1050 int error;
1051
1052 er.er_type = type;
1053 er.er_name = name;
1054 er.er_data = (void *)value;
1055 er.er_name_len = strlen(name);
1056 er.er_data_len = size;
1057
1058 memset(&es, 0, sizeof(struct ea_set));
1059 es.es_er = &er;
1060 es.es_el = el;
1061
1062 error = ea_foreach(ip, ea_set_simple, &es);
1063 if (error > 0)
1064 return 0;
1065 if (error)
1066 return error;
1067
1068 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1069 blks++;
1070 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1071 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1072
1073 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1074}
1075
1076static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1077 struct gfs2_ea_location *el)
1078{
1079 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1080 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1081 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1082 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1083 }
1084
1085 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1086}
1087
1088static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1089{
1090 struct gfs2_ea_header *ea = el->el_ea;
1091 struct gfs2_ea_header *prev = el->el_prev;
1092 struct buffer_head *dibh;
1093 int error;
1094
1095 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1096 if (error)
1097 return error;
1098
1099 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1100
1101 if (prev) {
1102 u32 len;
1103
1104 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1105 prev->ea_rec_len = cpu_to_be32(len);
1106
1107 if (GFS2_EA_IS_LAST(ea))
1108 prev->ea_flags |= GFS2_EAFLAG_LAST;
1109 } else {
1110 ea->ea_type = GFS2_EATYPE_UNUSED;
1111 }
1112
1113 error = gfs2_meta_inode_buffer(ip, &dibh);
1114 if (!error) {
1115 ip->i_inode.i_ctime = CURRENT_TIME;
1116 gfs2_trans_add_meta(ip->i_gl, dibh);
1117 gfs2_dinode_out(ip, dibh->b_data);
1118 brelse(dibh);
1119 }
1120
1121 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1122
1123 return error;
1124}
1125
1126/**
1127 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1128 * @ip: The inode
1129 * @type: The type of the extended attribute
1130 * @name: The name of the extended attribute
1131 *
1132 * This is not called directly by the VFS since we use the (common)
1133 * scheme of making a "set with NULL data" mean a remove request. Note
1134 * that this is different from a set with zero length data.
1135 *
1136 * Returns: 0, or errno on failure
1137 */
1138
1139static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1140{
1141 struct gfs2_ea_location el;
1142 int error;
1143
1144 if (!ip->i_eattr)
1145 return -ENODATA;
1146
1147 error = gfs2_ea_find(ip, type, name, &el);
1148 if (error)
1149 return error;
1150 if (!el.el_ea)
1151 return -ENODATA;
1152
1153 if (GFS2_EA_IS_STUFFED(el.el_ea))
1154 error = ea_remove_stuffed(ip, &el);
1155 else
1156 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1157
1158 brelse(el.el_bh);
1159
1160 return error;
1161}
1162
1163/**
1164 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1165 * @ip: The inode
1166 * @name: The name of the extended attribute
1167 * @value: The value of the extended attribute (NULL for remove)
1168 * @size: The size of the @value argument
1169 * @flags: Create or Replace
1170 * @type: The type of the extended attribute
1171 *
1172 * See gfs2_xattr_remove() for details of the removal of xattrs.
1173 *
1174 * Returns: 0 or errno on failure
1175 */
1176
1177int __gfs2_xattr_set(struct inode *inode, const char *name,
1178 const void *value, size_t size, int flags, int type)
1179{
1180 struct gfs2_inode *ip = GFS2_I(inode);
1181 struct gfs2_sbd *sdp = GFS2_SB(inode);
1182 struct gfs2_ea_location el;
1183 unsigned int namel = strlen(name);
1184 int error;
1185
1186 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1187 return -EPERM;
1188 if (namel > GFS2_EA_MAX_NAME_LEN)
1189 return -ERANGE;
1190
1191 if (value == NULL)
1192 return gfs2_xattr_remove(ip, type, name);
1193
1194 if (ea_check_size(sdp, namel, size))
1195 return -ERANGE;
1196
1197 if (!ip->i_eattr) {
1198 if (flags & XATTR_REPLACE)
1199 return -ENODATA;
1200 return ea_init(ip, type, name, value, size);
1201 }
1202
1203 error = gfs2_ea_find(ip, type, name, &el);
1204 if (error)
1205 return error;
1206
1207 if (el.el_ea) {
1208 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1209 brelse(el.el_bh);
1210 return -EPERM;
1211 }
1212
1213 error = -EEXIST;
1214 if (!(flags & XATTR_CREATE)) {
1215 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1216 error = ea_set_i(ip, type, name, value, size, &el);
1217 if (!error && unstuffed)
1218 ea_set_remove_unstuffed(ip, &el);
1219 }
1220
1221 brelse(el.el_bh);
1222 return error;
1223 }
1224
1225 error = -ENODATA;
1226 if (!(flags & XATTR_REPLACE))
1227 error = ea_set_i(ip, type, name, value, size, NULL);
1228
1229 return error;
1230}
1231
1232static int gfs2_xattr_set(const struct xattr_handler *handler,
1233 struct dentry *dentry, const char *name,
1234 const void *value, size_t size, int flags)
1235{
1236 return __gfs2_xattr_set(d_inode(dentry), name, value,
1237 size, flags, handler->flags);
1238}
1239
1240static int ea_dealloc_indirect(struct gfs2_inode *ip)
1241{
1242 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1243 struct gfs2_rgrp_list rlist;
1244 struct buffer_head *indbh, *dibh;
1245 __be64 *eablk, *end;
1246 unsigned int rg_blocks = 0;
1247 u64 bstart = 0;
1248 unsigned int blen = 0;
1249 unsigned int blks = 0;
1250 unsigned int x;
1251 int error;
1252
1253 error = gfs2_rindex_update(sdp);
1254 if (error)
1255 return error;
1256
1257 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1258
1259 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1260 if (error)
1261 return error;
1262
1263 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1264 error = -EIO;
1265 goto out;
1266 }
1267
1268 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1269 end = eablk + sdp->sd_inptrs;
1270
1271 for (; eablk < end; eablk++) {
1272 u64 bn;
1273
1274 if (!*eablk)
1275 break;
1276 bn = be64_to_cpu(*eablk);
1277
1278 if (bstart + blen == bn)
1279 blen++;
1280 else {
1281 if (bstart)
1282 gfs2_rlist_add(ip, &rlist, bstart);
1283 bstart = bn;
1284 blen = 1;
1285 }
1286 blks++;
1287 }
1288 if (bstart)
1289 gfs2_rlist_add(ip, &rlist, bstart);
1290 else
1291 goto out;
1292
1293 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1294
1295 for (x = 0; x < rlist.rl_rgrps; x++) {
1296 struct gfs2_rgrpd *rgd;
1297 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1298 rg_blocks += rgd->rd_length;
1299 }
1300
1301 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1302 if (error)
1303 goto out_rlist_free;
1304
1305 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1306 RES_STATFS + RES_QUOTA, blks);
1307 if (error)
1308 goto out_gunlock;
1309
1310 gfs2_trans_add_meta(ip->i_gl, indbh);
1311
1312 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1313 bstart = 0;
1314 blen = 0;
1315
1316 for (; eablk < end; eablk++) {
1317 u64 bn;
1318
1319 if (!*eablk)
1320 break;
1321 bn = be64_to_cpu(*eablk);
1322
1323 if (bstart + blen == bn)
1324 blen++;
1325 else {
1326 if (bstart)
1327 gfs2_free_meta(ip, bstart, blen);
1328 bstart = bn;
1329 blen = 1;
1330 }
1331
1332 *eablk = 0;
1333 gfs2_add_inode_blocks(&ip->i_inode, -1);
1334 }
1335 if (bstart)
1336 gfs2_free_meta(ip, bstart, blen);
1337
1338 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1339
1340 error = gfs2_meta_inode_buffer(ip, &dibh);
1341 if (!error) {
1342 gfs2_trans_add_meta(ip->i_gl, dibh);
1343 gfs2_dinode_out(ip, dibh->b_data);
1344 brelse(dibh);
1345 }
1346
1347 gfs2_trans_end(sdp);
1348
1349out_gunlock:
1350 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1351out_rlist_free:
1352 gfs2_rlist_free(&rlist);
1353out:
1354 brelse(indbh);
1355 return error;
1356}
1357
1358static int ea_dealloc_block(struct gfs2_inode *ip)
1359{
1360 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1361 struct gfs2_rgrpd *rgd;
1362 struct buffer_head *dibh;
1363 struct gfs2_holder gh;
1364 int error;
1365
1366 error = gfs2_rindex_update(sdp);
1367 if (error)
1368 return error;
1369
1370 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1371 if (!rgd) {
1372 gfs2_consist_inode(ip);
1373 return -EIO;
1374 }
1375
1376 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1377 if (error)
1378 return error;
1379
1380 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1381 RES_QUOTA, 1);
1382 if (error)
1383 goto out_gunlock;
1384
1385 gfs2_free_meta(ip, ip->i_eattr, 1);
1386
1387 ip->i_eattr = 0;
1388 gfs2_add_inode_blocks(&ip->i_inode, -1);
1389
1390 error = gfs2_meta_inode_buffer(ip, &dibh);
1391 if (!error) {
1392 gfs2_trans_add_meta(ip->i_gl, dibh);
1393 gfs2_dinode_out(ip, dibh->b_data);
1394 brelse(dibh);
1395 }
1396
1397 gfs2_trans_end(sdp);
1398
1399out_gunlock:
1400 gfs2_glock_dq_uninit(&gh);
1401 return error;
1402}
1403
1404/**
1405 * gfs2_ea_dealloc - deallocate the extended attribute fork
1406 * @ip: the inode
1407 *
1408 * Returns: errno
1409 */
1410
1411int gfs2_ea_dealloc(struct gfs2_inode *ip)
1412{
1413 int error;
1414
1415 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1416 if (error)
1417 return error;
1418
1419 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1420 if (error)
1421 return error;
1422
1423 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1424 if (error)
1425 goto out_quota;
1426
1427 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1428 error = ea_dealloc_indirect(ip);
1429 if (error)
1430 goto out_quota;
1431 }
1432
1433 error = ea_dealloc_block(ip);
1434
1435out_quota:
1436 gfs2_quota_unhold(ip);
1437 return error;
1438}
1439
1440static const struct xattr_handler gfs2_xattr_user_handler = {
1441 .prefix = XATTR_USER_PREFIX,
1442 .flags = GFS2_EATYPE_USR,
1443 .get = gfs2_xattr_get,
1444 .set = gfs2_xattr_set,
1445};
1446
1447static const struct xattr_handler gfs2_xattr_security_handler = {
1448 .prefix = XATTR_SECURITY_PREFIX,
1449 .flags = GFS2_EATYPE_SECURITY,
1450 .get = gfs2_xattr_get,
1451 .set = gfs2_xattr_set,
1452};
1453
1454const struct xattr_handler *gfs2_xattr_handlers[] = {
1455 &gfs2_xattr_user_handler,
1456 &gfs2_xattr_security_handler,
1457 &posix_acl_access_xattr_handler,
1458 &posix_acl_default_xattr_handler,
1459 NULL,
1460};
1461
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;