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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 <linux/uaccess.h>
18
19#include "gfs2.h"
20#include "incore.h"
21#include "acl.h"
22#include "xattr.h"
23#include "glock.h"
24#include "inode.h"
25#include "meta_io.h"
26#include "quota.h"
27#include "rgrp.h"
28#include "trans.h"
29#include "util.h"
30
31/**
32 * 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(&ip->i_inode);
313 gfs2_trans_add_meta(ip->i_gl, dibh);
314 gfs2_dinode_out(ip, dibh->b_data);
315 brelse(dibh);
316 }
317
318 gfs2_trans_end(sdp);
319
320out_gunlock:
321 gfs2_glock_dq_uninit(&rg_gh);
322 return error;
323}
324
325static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
326 struct gfs2_ea_header *ea,
327 struct gfs2_ea_header *prev, int leave)
328{
329 int error;
330
331 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
332 if (error)
333 return error;
334
335 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
336 if (error)
337 goto out_alloc;
338
339 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340
341 gfs2_quota_unhold(ip);
342out_alloc:
343 return error;
344}
345
346struct ea_list {
347 struct gfs2_ea_request *ei_er;
348 unsigned int ei_size;
349};
350
351static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
352{
353 switch (ea->ea_type) {
354 case GFS2_EATYPE_USR:
355 return 5 + ea->ea_name_len + 1;
356 case GFS2_EATYPE_SYS:
357 return 7 + ea->ea_name_len + 1;
358 case GFS2_EATYPE_SECURITY:
359 return 9 + ea->ea_name_len + 1;
360 default:
361 return 0;
362 }
363}
364
365static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
366 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
367 void *private)
368{
369 struct ea_list *ei = private;
370 struct gfs2_ea_request *er = ei->ei_er;
371 unsigned int ea_size = gfs2_ea_strlen(ea);
372
373 if (ea->ea_type == GFS2_EATYPE_UNUSED)
374 return 0;
375
376 if (er->er_data_len) {
377 char *prefix = NULL;
378 unsigned int l = 0;
379 char c = 0;
380
381 if (ei->ei_size + ea_size > er->er_data_len)
382 return -ERANGE;
383
384 switch (ea->ea_type) {
385 case GFS2_EATYPE_USR:
386 prefix = "user.";
387 l = 5;
388 break;
389 case GFS2_EATYPE_SYS:
390 prefix = "system.";
391 l = 7;
392 break;
393 case GFS2_EATYPE_SECURITY:
394 prefix = "security.";
395 l = 9;
396 break;
397 }
398
399 BUG_ON(l == 0);
400
401 memcpy(er->er_data + ei->ei_size, prefix, l);
402 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
403 ea->ea_name_len);
404 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
405 }
406
407 ei->ei_size += ea_size;
408
409 return 0;
410}
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(struct inode *inode, const char *name,
587 void *buffer, size_t size, int type)
588{
589 struct gfs2_inode *ip = GFS2_I(inode);
590 struct gfs2_ea_location el;
591 int error;
592
593 if (!ip->i_eattr)
594 return -ENODATA;
595 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
596 return -EINVAL;
597
598 error = gfs2_ea_find(ip, type, name, &el);
599 if (error)
600 return error;
601 if (!el.el_ea)
602 return -ENODATA;
603 if (size)
604 error = gfs2_ea_get_copy(ip, &el, buffer, size);
605 else
606 error = GFS2_EA_DATA_LEN(el.el_ea);
607 brelse(el.el_bh);
608
609 return error;
610}
611
612static int gfs2_xattr_get(const struct xattr_handler *handler,
613 struct dentry *unused, struct inode *inode,
614 const char *name, void *buffer, size_t size)
615{
616 struct gfs2_inode *ip = GFS2_I(inode);
617 struct gfs2_holder gh;
618 bool need_unlock = false;
619 int ret;
620
621 /* During lookup, SELinux calls this function with the glock locked. */
622
623 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
624 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
625 if (ret)
626 return ret;
627 need_unlock = true;
628 }
629 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
630 if (need_unlock)
631 gfs2_glock_dq_uninit(&gh);
632 return ret;
633}
634
635/**
636 * ea_alloc_blk - allocates a new block for extended attributes.
637 * @ip: A pointer to the inode that's getting extended attributes
638 * @bhp: Pointer to pointer to a struct buffer_head
639 *
640 * Returns: errno
641 */
642
643static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
644{
645 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
646 struct gfs2_ea_header *ea;
647 unsigned int n = 1;
648 u64 block;
649 int error;
650
651 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
652 if (error)
653 return error;
654 gfs2_trans_add_unrevoke(sdp, block, 1);
655 *bhp = gfs2_meta_new(ip->i_gl, block);
656 gfs2_trans_add_meta(ip->i_gl, *bhp);
657 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
658 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
659
660 ea = GFS2_EA_BH2FIRST(*bhp);
661 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
662 ea->ea_type = GFS2_EATYPE_UNUSED;
663 ea->ea_flags = GFS2_EAFLAG_LAST;
664 ea->ea_num_ptrs = 0;
665
666 gfs2_add_inode_blocks(&ip->i_inode, 1);
667
668 return 0;
669}
670
671/**
672 * ea_write - writes the request info to an ea, creating new blocks if
673 * necessary
674 * @ip: inode that is being modified
675 * @ea: the location of the new ea in a block
676 * @er: the write request
677 *
678 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
679 *
680 * returns : errno
681 */
682
683static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
684 struct gfs2_ea_request *er)
685{
686 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
687 int error;
688
689 ea->ea_data_len = cpu_to_be32(er->er_data_len);
690 ea->ea_name_len = er->er_name_len;
691 ea->ea_type = er->er_type;
692 ea->__pad = 0;
693
694 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
695
696 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
697 ea->ea_num_ptrs = 0;
698 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
699 } else {
700 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
701 const char *data = er->er_data;
702 unsigned int data_len = er->er_data_len;
703 unsigned int copy;
704 unsigned int x;
705
706 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
707 for (x = 0; x < ea->ea_num_ptrs; x++) {
708 struct buffer_head *bh;
709 u64 block;
710 int mh_size = sizeof(struct gfs2_meta_header);
711 unsigned int n = 1;
712
713 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
714 if (error)
715 return error;
716 gfs2_trans_add_unrevoke(sdp, block, 1);
717 bh = gfs2_meta_new(ip->i_gl, block);
718 gfs2_trans_add_meta(ip->i_gl, bh);
719 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
720
721 gfs2_add_inode_blocks(&ip->i_inode, 1);
722
723 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
724 data_len;
725 memcpy(bh->b_data + mh_size, data, copy);
726 if (copy < sdp->sd_jbsize)
727 memset(bh->b_data + mh_size + copy, 0,
728 sdp->sd_jbsize - copy);
729
730 *dataptr++ = cpu_to_be64(bh->b_blocknr);
731 data += copy;
732 data_len -= copy;
733
734 brelse(bh);
735 }
736
737 gfs2_assert_withdraw(sdp, !data_len);
738 }
739
740 return 0;
741}
742
743typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
744 struct gfs2_ea_request *er, void *private);
745
746static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
747 unsigned int blks,
748 ea_skeleton_call_t skeleton_call, void *private)
749{
750 struct gfs2_alloc_parms ap = { .target = blks };
751 struct buffer_head *dibh;
752 int error;
753
754 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
755 if (error)
756 return error;
757
758 error = gfs2_quota_lock_check(ip, &ap);
759 if (error)
760 return error;
761
762 error = gfs2_inplace_reserve(ip, &ap);
763 if (error)
764 goto out_gunlock_q;
765
766 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
767 blks + gfs2_rg_blocks(ip, blks) +
768 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
769 if (error)
770 goto out_ipres;
771
772 error = skeleton_call(ip, er, private);
773 if (error)
774 goto out_end_trans;
775
776 error = gfs2_meta_inode_buffer(ip, &dibh);
777 if (!error) {
778 ip->i_inode.i_ctime = current_time(&ip->i_inode);
779 gfs2_trans_add_meta(ip->i_gl, dibh);
780 gfs2_dinode_out(ip, dibh->b_data);
781 brelse(dibh);
782 }
783
784out_end_trans:
785 gfs2_trans_end(GFS2_SB(&ip->i_inode));
786out_ipres:
787 gfs2_inplace_release(ip);
788out_gunlock_q:
789 gfs2_quota_unlock(ip);
790 return error;
791}
792
793static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
794 void *private)
795{
796 struct buffer_head *bh;
797 int error;
798
799 error = ea_alloc_blk(ip, &bh);
800 if (error)
801 return error;
802
803 ip->i_eattr = bh->b_blocknr;
804 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
805
806 brelse(bh);
807
808 return error;
809}
810
811/**
812 * ea_init - initializes a new eattr block
813 * @ip:
814 * @er:
815 *
816 * Returns: errno
817 */
818
819static int ea_init(struct gfs2_inode *ip, int type, const char *name,
820 const void *data, size_t size)
821{
822 struct gfs2_ea_request er;
823 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
824 unsigned int blks = 1;
825
826 er.er_type = type;
827 er.er_name = name;
828 er.er_name_len = strlen(name);
829 er.er_data = (void *)data;
830 er.er_data_len = size;
831
832 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
833 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
834
835 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
836}
837
838static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
839{
840 u32 ea_size = GFS2_EA_SIZE(ea);
841 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
842 ea_size);
843 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
844 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
845
846 ea->ea_rec_len = cpu_to_be32(ea_size);
847 ea->ea_flags ^= last;
848
849 new->ea_rec_len = cpu_to_be32(new_size);
850 new->ea_flags = last;
851
852 return new;
853}
854
855static void ea_set_remove_stuffed(struct gfs2_inode *ip,
856 struct gfs2_ea_location *el)
857{
858 struct gfs2_ea_header *ea = el->el_ea;
859 struct gfs2_ea_header *prev = el->el_prev;
860 u32 len;
861
862 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
863
864 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
865 ea->ea_type = GFS2_EATYPE_UNUSED;
866 return;
867 } else if (GFS2_EA2NEXT(prev) != ea) {
868 prev = GFS2_EA2NEXT(prev);
869 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
870 }
871
872 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
873 prev->ea_rec_len = cpu_to_be32(len);
874
875 if (GFS2_EA_IS_LAST(ea))
876 prev->ea_flags |= GFS2_EAFLAG_LAST;
877}
878
879struct ea_set {
880 int ea_split;
881
882 struct gfs2_ea_request *es_er;
883 struct gfs2_ea_location *es_el;
884
885 struct buffer_head *es_bh;
886 struct gfs2_ea_header *es_ea;
887};
888
889static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
890 struct gfs2_ea_header *ea, struct ea_set *es)
891{
892 struct gfs2_ea_request *er = es->es_er;
893 struct buffer_head *dibh;
894 int error;
895
896 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
897 if (error)
898 return error;
899
900 gfs2_trans_add_meta(ip->i_gl, bh);
901
902 if (es->ea_split)
903 ea = ea_split_ea(ea);
904
905 ea_write(ip, ea, er);
906
907 if (es->es_el)
908 ea_set_remove_stuffed(ip, es->es_el);
909
910 error = gfs2_meta_inode_buffer(ip, &dibh);
911 if (error)
912 goto out;
913 ip->i_inode.i_ctime = current_time(&ip->i_inode);
914 gfs2_trans_add_meta(ip->i_gl, dibh);
915 gfs2_dinode_out(ip, dibh->b_data);
916 brelse(dibh);
917out:
918 gfs2_trans_end(GFS2_SB(&ip->i_inode));
919 return error;
920}
921
922static int ea_set_simple_alloc(struct gfs2_inode *ip,
923 struct gfs2_ea_request *er, void *private)
924{
925 struct ea_set *es = private;
926 struct gfs2_ea_header *ea = es->es_ea;
927 int error;
928
929 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
930
931 if (es->ea_split)
932 ea = ea_split_ea(ea);
933
934 error = ea_write(ip, ea, er);
935 if (error)
936 return error;
937
938 if (es->es_el)
939 ea_set_remove_stuffed(ip, es->es_el);
940
941 return 0;
942}
943
944static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
945 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
946 void *private)
947{
948 struct ea_set *es = private;
949 unsigned int size;
950 int stuffed;
951 int error;
952
953 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
954 es->es_er->er_data_len, &size);
955
956 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
957 if (GFS2_EA_REC_LEN(ea) < size)
958 return 0;
959 if (!GFS2_EA_IS_STUFFED(ea)) {
960 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
961 if (error)
962 return error;
963 }
964 es->ea_split = 0;
965 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
966 es->ea_split = 1;
967 else
968 return 0;
969
970 if (stuffed) {
971 error = ea_set_simple_noalloc(ip, bh, ea, es);
972 if (error)
973 return error;
974 } else {
975 unsigned int blks;
976
977 es->es_bh = bh;
978 es->es_ea = ea;
979 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
980 GFS2_SB(&ip->i_inode)->sd_jbsize);
981
982 error = ea_alloc_skeleton(ip, es->es_er, blks,
983 ea_set_simple_alloc, es);
984 if (error)
985 return error;
986 }
987
988 return 1;
989}
990
991static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
992 void *private)
993{
994 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
995 struct buffer_head *indbh, *newbh;
996 __be64 *eablk;
997 int error;
998 int mh_size = sizeof(struct gfs2_meta_header);
999
1000 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1001 __be64 *end;
1002
1003 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
1004 &indbh);
1005 if (error)
1006 return error;
1007
1008 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1009 error = -EIO;
1010 goto out;
1011 }
1012
1013 eablk = (__be64 *)(indbh->b_data + mh_size);
1014 end = eablk + sdp->sd_inptrs;
1015
1016 for (; eablk < end; eablk++)
1017 if (!*eablk)
1018 break;
1019
1020 if (eablk == end) {
1021 error = -ENOSPC;
1022 goto out;
1023 }
1024
1025 gfs2_trans_add_meta(ip->i_gl, indbh);
1026 } else {
1027 u64 blk;
1028 unsigned int n = 1;
1029 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1030 if (error)
1031 return error;
1032 gfs2_trans_add_unrevoke(sdp, blk, 1);
1033 indbh = gfs2_meta_new(ip->i_gl, blk);
1034 gfs2_trans_add_meta(ip->i_gl, indbh);
1035 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1036 gfs2_buffer_clear_tail(indbh, mh_size);
1037
1038 eablk = (__be64 *)(indbh->b_data + mh_size);
1039 *eablk = cpu_to_be64(ip->i_eattr);
1040 ip->i_eattr = blk;
1041 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1042 gfs2_add_inode_blocks(&ip->i_inode, 1);
1043
1044 eablk++;
1045 }
1046
1047 error = ea_alloc_blk(ip, &newbh);
1048 if (error)
1049 goto out;
1050
1051 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1052 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1053 brelse(newbh);
1054 if (error)
1055 goto out;
1056
1057 if (private)
1058 ea_set_remove_stuffed(ip, private);
1059
1060out:
1061 brelse(indbh);
1062 return error;
1063}
1064
1065static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1066 const void *value, size_t size, struct gfs2_ea_location *el)
1067{
1068 struct gfs2_ea_request er;
1069 struct ea_set es;
1070 unsigned int blks = 2;
1071 int error;
1072
1073 er.er_type = type;
1074 er.er_name = name;
1075 er.er_data = (void *)value;
1076 er.er_name_len = strlen(name);
1077 er.er_data_len = size;
1078
1079 memset(&es, 0, sizeof(struct ea_set));
1080 es.es_er = &er;
1081 es.es_el = el;
1082
1083 error = ea_foreach(ip, ea_set_simple, &es);
1084 if (error > 0)
1085 return 0;
1086 if (error)
1087 return error;
1088
1089 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1090 blks++;
1091 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1092 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1093
1094 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1095}
1096
1097static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1098 struct gfs2_ea_location *el)
1099{
1100 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1101 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1102 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1103 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1104 }
1105
1106 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1107}
1108
1109static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1110{
1111 struct gfs2_ea_header *ea = el->el_ea;
1112 struct gfs2_ea_header *prev = el->el_prev;
1113 struct buffer_head *dibh;
1114 int error;
1115
1116 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1117 if (error)
1118 return error;
1119
1120 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1121
1122 if (prev) {
1123 u32 len;
1124
1125 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1126 prev->ea_rec_len = cpu_to_be32(len);
1127
1128 if (GFS2_EA_IS_LAST(ea))
1129 prev->ea_flags |= GFS2_EAFLAG_LAST;
1130 } else {
1131 ea->ea_type = GFS2_EATYPE_UNUSED;
1132 }
1133
1134 error = gfs2_meta_inode_buffer(ip, &dibh);
1135 if (!error) {
1136 ip->i_inode.i_ctime = current_time(&ip->i_inode);
1137 gfs2_trans_add_meta(ip->i_gl, dibh);
1138 gfs2_dinode_out(ip, dibh->b_data);
1139 brelse(dibh);
1140 }
1141
1142 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1143
1144 return error;
1145}
1146
1147/**
1148 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1149 * @ip: The inode
1150 * @type: The type of the extended attribute
1151 * @name: The name of the extended attribute
1152 *
1153 * This is not called directly by the VFS since we use the (common)
1154 * scheme of making a "set with NULL data" mean a remove request. Note
1155 * that this is different from a set with zero length data.
1156 *
1157 * Returns: 0, or errno on failure
1158 */
1159
1160static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1161{
1162 struct gfs2_ea_location el;
1163 int error;
1164
1165 if (!ip->i_eattr)
1166 return -ENODATA;
1167
1168 error = gfs2_ea_find(ip, type, name, &el);
1169 if (error)
1170 return error;
1171 if (!el.el_ea)
1172 return -ENODATA;
1173
1174 if (GFS2_EA_IS_STUFFED(el.el_ea))
1175 error = ea_remove_stuffed(ip, &el);
1176 else
1177 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1178
1179 brelse(el.el_bh);
1180
1181 return error;
1182}
1183
1184/**
1185 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1186 * @ip: The inode
1187 * @name: The name of the extended attribute
1188 * @value: The value of the extended attribute (NULL for remove)
1189 * @size: The size of the @value argument
1190 * @flags: Create or Replace
1191 * @type: The type of the extended attribute
1192 *
1193 * See gfs2_xattr_remove() for details of the removal of xattrs.
1194 *
1195 * Returns: 0 or errno on failure
1196 */
1197
1198int __gfs2_xattr_set(struct inode *inode, const char *name,
1199 const void *value, size_t size, int flags, int type)
1200{
1201 struct gfs2_inode *ip = GFS2_I(inode);
1202 struct gfs2_sbd *sdp = GFS2_SB(inode);
1203 struct gfs2_ea_location el;
1204 unsigned int namel = strlen(name);
1205 int error;
1206
1207 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1208 return -EPERM;
1209 if (namel > GFS2_EA_MAX_NAME_LEN)
1210 return -ERANGE;
1211
1212 if (value == NULL)
1213 return gfs2_xattr_remove(ip, type, name);
1214
1215 if (ea_check_size(sdp, namel, size))
1216 return -ERANGE;
1217
1218 if (!ip->i_eattr) {
1219 if (flags & XATTR_REPLACE)
1220 return -ENODATA;
1221 return ea_init(ip, type, name, value, size);
1222 }
1223
1224 error = gfs2_ea_find(ip, type, name, &el);
1225 if (error)
1226 return error;
1227
1228 if (el.el_ea) {
1229 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1230 brelse(el.el_bh);
1231 return -EPERM;
1232 }
1233
1234 error = -EEXIST;
1235 if (!(flags & XATTR_CREATE)) {
1236 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1237 error = ea_set_i(ip, type, name, value, size, &el);
1238 if (!error && unstuffed)
1239 ea_set_remove_unstuffed(ip, &el);
1240 }
1241
1242 brelse(el.el_bh);
1243 return error;
1244 }
1245
1246 error = -ENODATA;
1247 if (!(flags & XATTR_REPLACE))
1248 error = ea_set_i(ip, type, name, value, size, NULL);
1249
1250 return error;
1251}
1252
1253static int gfs2_xattr_set(const struct xattr_handler *handler,
1254 struct dentry *unused, struct inode *inode,
1255 const char *name, const void *value,
1256 size_t size, int flags)
1257{
1258 struct gfs2_inode *ip = GFS2_I(inode);
1259 struct gfs2_holder gh;
1260 int ret;
1261
1262 ret = gfs2_rsqa_alloc(ip);
1263 if (ret)
1264 return ret;
1265
1266 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1267 if (ret)
1268 return ret;
1269 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1270 gfs2_glock_dq_uninit(&gh);
1271 return ret;
1272}
1273
1274static int ea_dealloc_indirect(struct gfs2_inode *ip)
1275{
1276 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1277 struct gfs2_rgrp_list rlist;
1278 struct buffer_head *indbh, *dibh;
1279 __be64 *eablk, *end;
1280 unsigned int rg_blocks = 0;
1281 u64 bstart = 0;
1282 unsigned int blen = 0;
1283 unsigned int blks = 0;
1284 unsigned int x;
1285 int error;
1286
1287 error = gfs2_rindex_update(sdp);
1288 if (error)
1289 return error;
1290
1291 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1292
1293 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1294 if (error)
1295 return error;
1296
1297 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1298 error = -EIO;
1299 goto out;
1300 }
1301
1302 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1303 end = eablk + sdp->sd_inptrs;
1304
1305 for (; eablk < end; eablk++) {
1306 u64 bn;
1307
1308 if (!*eablk)
1309 break;
1310 bn = be64_to_cpu(*eablk);
1311
1312 if (bstart + blen == bn)
1313 blen++;
1314 else {
1315 if (bstart)
1316 gfs2_rlist_add(ip, &rlist, bstart);
1317 bstart = bn;
1318 blen = 1;
1319 }
1320 blks++;
1321 }
1322 if (bstart)
1323 gfs2_rlist_add(ip, &rlist, bstart);
1324 else
1325 goto out;
1326
1327 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1328
1329 for (x = 0; x < rlist.rl_rgrps; x++) {
1330 struct gfs2_rgrpd *rgd;
1331 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1332 rg_blocks += rgd->rd_length;
1333 }
1334
1335 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1336 if (error)
1337 goto out_rlist_free;
1338
1339 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1340 RES_STATFS + RES_QUOTA, blks);
1341 if (error)
1342 goto out_gunlock;
1343
1344 gfs2_trans_add_meta(ip->i_gl, indbh);
1345
1346 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1347 bstart = 0;
1348 blen = 0;
1349
1350 for (; eablk < end; eablk++) {
1351 u64 bn;
1352
1353 if (!*eablk)
1354 break;
1355 bn = be64_to_cpu(*eablk);
1356
1357 if (bstart + blen == bn)
1358 blen++;
1359 else {
1360 if (bstart)
1361 gfs2_free_meta(ip, bstart, blen);
1362 bstart = bn;
1363 blen = 1;
1364 }
1365
1366 *eablk = 0;
1367 gfs2_add_inode_blocks(&ip->i_inode, -1);
1368 }
1369 if (bstart)
1370 gfs2_free_meta(ip, bstart, blen);
1371
1372 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1373
1374 error = gfs2_meta_inode_buffer(ip, &dibh);
1375 if (!error) {
1376 gfs2_trans_add_meta(ip->i_gl, dibh);
1377 gfs2_dinode_out(ip, dibh->b_data);
1378 brelse(dibh);
1379 }
1380
1381 gfs2_trans_end(sdp);
1382
1383out_gunlock:
1384 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385out_rlist_free:
1386 gfs2_rlist_free(&rlist);
1387out:
1388 brelse(indbh);
1389 return error;
1390}
1391
1392static int ea_dealloc_block(struct gfs2_inode *ip)
1393{
1394 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1395 struct gfs2_rgrpd *rgd;
1396 struct buffer_head *dibh;
1397 struct gfs2_holder gh;
1398 int error;
1399
1400 error = gfs2_rindex_update(sdp);
1401 if (error)
1402 return error;
1403
1404 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1405 if (!rgd) {
1406 gfs2_consist_inode(ip);
1407 return -EIO;
1408 }
1409
1410 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1411 if (error)
1412 return error;
1413
1414 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1415 RES_QUOTA, 1);
1416 if (error)
1417 goto out_gunlock;
1418
1419 gfs2_free_meta(ip, ip->i_eattr, 1);
1420
1421 ip->i_eattr = 0;
1422 gfs2_add_inode_blocks(&ip->i_inode, -1);
1423
1424 error = gfs2_meta_inode_buffer(ip, &dibh);
1425 if (!error) {
1426 gfs2_trans_add_meta(ip->i_gl, dibh);
1427 gfs2_dinode_out(ip, dibh->b_data);
1428 brelse(dibh);
1429 }
1430
1431 gfs2_trans_end(sdp);
1432
1433out_gunlock:
1434 gfs2_glock_dq_uninit(&gh);
1435 return error;
1436}
1437
1438/**
1439 * gfs2_ea_dealloc - deallocate the extended attribute fork
1440 * @ip: the inode
1441 *
1442 * Returns: errno
1443 */
1444
1445int gfs2_ea_dealloc(struct gfs2_inode *ip)
1446{
1447 int error;
1448
1449 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1450 if (error)
1451 return error;
1452
1453 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1454 if (error)
1455 return error;
1456
1457 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1458 if (error)
1459 goto out_quota;
1460
1461 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1462 error = ea_dealloc_indirect(ip);
1463 if (error)
1464 goto out_quota;
1465 }
1466
1467 error = ea_dealloc_block(ip);
1468
1469out_quota:
1470 gfs2_quota_unhold(ip);
1471 return error;
1472}
1473
1474static const struct xattr_handler gfs2_xattr_user_handler = {
1475 .prefix = XATTR_USER_PREFIX,
1476 .flags = GFS2_EATYPE_USR,
1477 .get = gfs2_xattr_get,
1478 .set = gfs2_xattr_set,
1479};
1480
1481static const struct xattr_handler gfs2_xattr_security_handler = {
1482 .prefix = XATTR_SECURITY_PREFIX,
1483 .flags = GFS2_EATYPE_SECURITY,
1484 .get = gfs2_xattr_get,
1485 .set = gfs2_xattr_set,
1486};
1487
1488const struct xattr_handler *gfs2_xattr_handlers[] = {
1489 &gfs2_xattr_user_handler,
1490 &gfs2_xattr_security_handler,
1491 &posix_acl_access_xattr_handler,
1492 &posix_acl_default_xattr_handler,
1493 NULL,
1494};
1495
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 error = gfs2_rindex_update(sdp);
242 if (error)
243 return error;
244
245 if (GFS2_EA_IS_STUFFED(ea))
246 return 0;
247
248 dataptrs = GFS2_EA2DATAPTRS(ea);
249 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
250 if (*dataptrs) {
251 blks++;
252 bn = be64_to_cpu(*dataptrs);
253 }
254 }
255 if (!blks)
256 return 0;
257
258 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
259 if (!rgd) {
260 gfs2_consist_inode(ip);
261 return -EIO;
262 }
263
264 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
265 if (error)
266 return error;
267
268 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
269 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
270 if (error)
271 goto out_gunlock;
272
273 gfs2_trans_add_bh(ip->i_gl, bh, 1);
274
275 dataptrs = GFS2_EA2DATAPTRS(ea);
276 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
277 if (!*dataptrs)
278 break;
279 bn = be64_to_cpu(*dataptrs);
280
281 if (bstart + blen == bn)
282 blen++;
283 else {
284 if (bstart)
285 gfs2_free_meta(ip, bstart, blen);
286 bstart = bn;
287 blen = 1;
288 }
289
290 *dataptrs = 0;
291 gfs2_add_inode_blocks(&ip->i_inode, -1);
292 }
293 if (bstart)
294 gfs2_free_meta(ip, bstart, blen);
295
296 if (prev && !leave) {
297 u32 len;
298
299 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
300 prev->ea_rec_len = cpu_to_be32(len);
301
302 if (GFS2_EA_IS_LAST(ea))
303 prev->ea_flags |= GFS2_EAFLAG_LAST;
304 } else {
305 ea->ea_type = GFS2_EATYPE_UNUSED;
306 ea->ea_num_ptrs = 0;
307 }
308
309 error = gfs2_meta_inode_buffer(ip, &dibh);
310 if (!error) {
311 ip->i_inode.i_ctime = CURRENT_TIME;
312 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
313 gfs2_dinode_out(ip, dibh->b_data);
314 brelse(dibh);
315 }
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 struct gfs2_qadata *qa;
329 int error;
330
331 qa = gfs2_qadata_get(ip);
332 if (!qa)
333 return -ENOMEM;
334
335 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_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 gfs2_qadata_put(ip);
344 return error;
345}
346
347struct ea_list {
348 struct gfs2_ea_request *ei_er;
349 unsigned int ei_size;
350};
351
352static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
353{
354 switch (ea->ea_type) {
355 case GFS2_EATYPE_USR:
356 return 5 + ea->ea_name_len + 1;
357 case GFS2_EATYPE_SYS:
358 return 7 + ea->ea_name_len + 1;
359 case GFS2_EATYPE_SECURITY:
360 return 9 + ea->ea_name_len + 1;
361 default:
362 return 0;
363 }
364}
365
366static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
367 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
368 void *private)
369{
370 struct ea_list *ei = private;
371 struct gfs2_ea_request *er = ei->ei_er;
372 unsigned int ea_size = gfs2_ea_strlen(ea);
373
374 if (ea->ea_type == GFS2_EATYPE_UNUSED)
375 return 0;
376
377 if (er->er_data_len) {
378 char *prefix = NULL;
379 unsigned int l = 0;
380 char c = 0;
381
382 if (ei->ei_size + ea_size > er->er_data_len)
383 return -ERANGE;
384
385 switch (ea->ea_type) {
386 case GFS2_EATYPE_USR:
387 prefix = "user.";
388 l = 5;
389 break;
390 case GFS2_EATYPE_SYS:
391 prefix = "system.";
392 l = 7;
393 break;
394 case GFS2_EATYPE_SECURITY:
395 prefix = "security.";
396 l = 9;
397 break;
398 }
399
400 BUG_ON(l == 0);
401
402 memcpy(er->er_data + ei->ei_size, prefix, l);
403 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
404 ea->ea_name_len);
405 memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
406 }
407
408 ei->ei_size += ea_size;
409
410 return 0;
411}
412
413/**
414 * gfs2_listxattr - List gfs2 extended attributes
415 * @dentry: The dentry whose inode we are interested in
416 * @buffer: The buffer to write the results
417 * @size: The size of the buffer
418 *
419 * Returns: actual size of data on success, -errno on error
420 */
421
422ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
423{
424 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
425 struct gfs2_ea_request er;
426 struct gfs2_holder i_gh;
427 int error;
428
429 memset(&er, 0, sizeof(struct gfs2_ea_request));
430 if (size) {
431 er.er_data = buffer;
432 er.er_data_len = size;
433 }
434
435 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
436 if (error)
437 return error;
438
439 if (ip->i_eattr) {
440 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
441
442 error = ea_foreach(ip, ea_list_i, &ei);
443 if (!error)
444 error = ei.ei_size;
445 }
446
447 gfs2_glock_dq_uninit(&i_gh);
448
449 return error;
450}
451
452/**
453 * ea_get_unstuffed - actually copies the unstuffed data into the
454 * request buffer
455 * @ip: The GFS2 inode
456 * @ea: The extended attribute header structure
457 * @data: The data to be copied
458 *
459 * Returns: errno
460 */
461
462static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
463 char *data)
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
473 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
474 if (!bh)
475 return -ENOMEM;
476
477 for (x = 0; x < nptrs; x++) {
478 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
479 bh + x);
480 if (error) {
481 while (x--)
482 brelse(bh[x]);
483 goto out;
484 }
485 dataptrs++;
486 }
487
488 for (x = 0; x < nptrs; x++) {
489 error = gfs2_meta_wait(sdp, bh[x]);
490 if (error) {
491 for (; x < nptrs; x++)
492 brelse(bh[x]);
493 goto out;
494 }
495 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
496 for (; x < nptrs; x++)
497 brelse(bh[x]);
498 error = -EIO;
499 goto out;
500 }
501
502 memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
503 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
504
505 amount -= sdp->sd_jbsize;
506 data += sdp->sd_jbsize;
507
508 brelse(bh[x]);
509 }
510
511out:
512 kfree(bh);
513 return error;
514}
515
516static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
517 char *data, size_t size)
518{
519 int ret;
520 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
521 if (len > size)
522 return -ERANGE;
523
524 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
525 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
526 return len;
527 }
528 ret = ea_get_unstuffed(ip, el->el_ea, data);
529 if (ret < 0)
530 return ret;
531 return len;
532}
533
534int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
535{
536 struct gfs2_ea_location el;
537 int error;
538 int len;
539 char *data;
540
541 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
542 if (error)
543 return error;
544 if (!el.el_ea)
545 goto out;
546 if (!GFS2_EA_DATA_LEN(el.el_ea))
547 goto out;
548
549 len = GFS2_EA_DATA_LEN(el.el_ea);
550 data = kmalloc(len, GFP_NOFS);
551 error = -ENOMEM;
552 if (data == NULL)
553 goto out;
554
555 error = gfs2_ea_get_copy(ip, &el, data, len);
556 if (error < 0)
557 kfree(data);
558 else
559 *ppdata = data;
560out:
561 brelse(el.el_bh);
562 return error;
563}
564
565/**
566 * gfs2_xattr_get - Get a GFS2 extended attribute
567 * @inode: The inode
568 * @name: The name of the extended attribute
569 * @buffer: The buffer to write the result into
570 * @size: The size of the buffer
571 * @type: The type of extended attribute
572 *
573 * Returns: actual size of data on success, -errno on error
574 */
575static int gfs2_xattr_get(struct dentry *dentry, const char *name,
576 void *buffer, size_t size, int type)
577{
578 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
579 struct gfs2_ea_location el;
580 int error;
581
582 if (!ip->i_eattr)
583 return -ENODATA;
584 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
585 return -EINVAL;
586
587 error = gfs2_ea_find(ip, type, name, &el);
588 if (error)
589 return error;
590 if (!el.el_ea)
591 return -ENODATA;
592 if (size)
593 error = gfs2_ea_get_copy(ip, &el, buffer, size);
594 else
595 error = GFS2_EA_DATA_LEN(el.el_ea);
596 brelse(el.el_bh);
597
598 return error;
599}
600
601/**
602 * ea_alloc_blk - allocates a new block for extended attributes.
603 * @ip: A pointer to the inode that's getting extended attributes
604 * @bhp: Pointer to pointer to a struct buffer_head
605 *
606 * Returns: errno
607 */
608
609static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
610{
611 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
612 struct gfs2_ea_header *ea;
613 unsigned int n = 1;
614 u64 block;
615 int error;
616
617 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
618 if (error)
619 return error;
620 gfs2_trans_add_unrevoke(sdp, block, 1);
621 *bhp = gfs2_meta_new(ip->i_gl, block);
622 gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
623 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
624 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
625
626 ea = GFS2_EA_BH2FIRST(*bhp);
627 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
628 ea->ea_type = GFS2_EATYPE_UNUSED;
629 ea->ea_flags = GFS2_EAFLAG_LAST;
630 ea->ea_num_ptrs = 0;
631
632 gfs2_add_inode_blocks(&ip->i_inode, 1);
633
634 return 0;
635}
636
637/**
638 * ea_write - writes the request info to an ea, creating new blocks if
639 * necessary
640 * @ip: inode that is being modified
641 * @ea: the location of the new ea in a block
642 * @er: the write request
643 *
644 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
645 *
646 * returns : errno
647 */
648
649static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
650 struct gfs2_ea_request *er)
651{
652 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
653 int error;
654
655 ea->ea_data_len = cpu_to_be32(er->er_data_len);
656 ea->ea_name_len = er->er_name_len;
657 ea->ea_type = er->er_type;
658 ea->__pad = 0;
659
660 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
661
662 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
663 ea->ea_num_ptrs = 0;
664 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
665 } else {
666 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
667 const char *data = er->er_data;
668 unsigned int data_len = er->er_data_len;
669 unsigned int copy;
670 unsigned int x;
671
672 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
673 for (x = 0; x < ea->ea_num_ptrs; x++) {
674 struct buffer_head *bh;
675 u64 block;
676 int mh_size = sizeof(struct gfs2_meta_header);
677 unsigned int n = 1;
678
679 error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
680 if (error)
681 return error;
682 gfs2_trans_add_unrevoke(sdp, block, 1);
683 bh = gfs2_meta_new(ip->i_gl, block);
684 gfs2_trans_add_bh(ip->i_gl, bh, 1);
685 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
686
687 gfs2_add_inode_blocks(&ip->i_inode, 1);
688
689 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
690 data_len;
691 memcpy(bh->b_data + mh_size, data, copy);
692 if (copy < sdp->sd_jbsize)
693 memset(bh->b_data + mh_size + copy, 0,
694 sdp->sd_jbsize - copy);
695
696 *dataptr++ = cpu_to_be64(bh->b_blocknr);
697 data += copy;
698 data_len -= copy;
699
700 brelse(bh);
701 }
702
703 gfs2_assert_withdraw(sdp, !data_len);
704 }
705
706 return 0;
707}
708
709typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
710 struct gfs2_ea_request *er, void *private);
711
712static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
713 unsigned int blks,
714 ea_skeleton_call_t skeleton_call, void *private)
715{
716 struct gfs2_qadata *qa;
717 struct buffer_head *dibh;
718 int error;
719
720 qa = gfs2_qadata_get(ip);
721 if (!qa)
722 return -ENOMEM;
723
724 error = gfs2_quota_lock_check(ip);
725 if (error)
726 goto out;
727
728 error = gfs2_inplace_reserve(ip, blks);
729 if (error)
730 goto out_gunlock_q;
731
732 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
733 blks + gfs2_rg_blocks(ip) +
734 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
735 if (error)
736 goto out_ipres;
737
738 error = skeleton_call(ip, er, private);
739 if (error)
740 goto out_end_trans;
741
742 error = gfs2_meta_inode_buffer(ip, &dibh);
743 if (!error) {
744 ip->i_inode.i_ctime = CURRENT_TIME;
745 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
746 gfs2_dinode_out(ip, dibh->b_data);
747 brelse(dibh);
748 }
749
750out_end_trans:
751 gfs2_trans_end(GFS2_SB(&ip->i_inode));
752out_ipres:
753 gfs2_inplace_release(ip);
754out_gunlock_q:
755 gfs2_quota_unlock(ip);
756out:
757 gfs2_qadata_put(ip);
758 return error;
759}
760
761static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
762 void *private)
763{
764 struct buffer_head *bh;
765 int error;
766
767 error = ea_alloc_blk(ip, &bh);
768 if (error)
769 return error;
770
771 ip->i_eattr = bh->b_blocknr;
772 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
773
774 brelse(bh);
775
776 return error;
777}
778
779/**
780 * ea_init - initializes a new eattr block
781 * @ip:
782 * @er:
783 *
784 * Returns: errno
785 */
786
787static int ea_init(struct gfs2_inode *ip, int type, const char *name,
788 const void *data, size_t size)
789{
790 struct gfs2_ea_request er;
791 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
792 unsigned int blks = 1;
793
794 er.er_type = type;
795 er.er_name = name;
796 er.er_name_len = strlen(name);
797 er.er_data = (void *)data;
798 er.er_data_len = size;
799
800 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
801 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
802
803 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
804}
805
806static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
807{
808 u32 ea_size = GFS2_EA_SIZE(ea);
809 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
810 ea_size);
811 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
812 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
813
814 ea->ea_rec_len = cpu_to_be32(ea_size);
815 ea->ea_flags ^= last;
816
817 new->ea_rec_len = cpu_to_be32(new_size);
818 new->ea_flags = last;
819
820 return new;
821}
822
823static void ea_set_remove_stuffed(struct gfs2_inode *ip,
824 struct gfs2_ea_location *el)
825{
826 struct gfs2_ea_header *ea = el->el_ea;
827 struct gfs2_ea_header *prev = el->el_prev;
828 u32 len;
829
830 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
831
832 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
833 ea->ea_type = GFS2_EATYPE_UNUSED;
834 return;
835 } else if (GFS2_EA2NEXT(prev) != ea) {
836 prev = GFS2_EA2NEXT(prev);
837 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
838 }
839
840 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
841 prev->ea_rec_len = cpu_to_be32(len);
842
843 if (GFS2_EA_IS_LAST(ea))
844 prev->ea_flags |= GFS2_EAFLAG_LAST;
845}
846
847struct ea_set {
848 int ea_split;
849
850 struct gfs2_ea_request *es_er;
851 struct gfs2_ea_location *es_el;
852
853 struct buffer_head *es_bh;
854 struct gfs2_ea_header *es_ea;
855};
856
857static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
858 struct gfs2_ea_header *ea, struct ea_set *es)
859{
860 struct gfs2_ea_request *er = es->es_er;
861 struct buffer_head *dibh;
862 int error;
863
864 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
865 if (error)
866 return error;
867
868 gfs2_trans_add_bh(ip->i_gl, bh, 1);
869
870 if (es->ea_split)
871 ea = ea_split_ea(ea);
872
873 ea_write(ip, ea, er);
874
875 if (es->es_el)
876 ea_set_remove_stuffed(ip, es->es_el);
877
878 error = gfs2_meta_inode_buffer(ip, &dibh);
879 if (error)
880 goto out;
881 ip->i_inode.i_ctime = CURRENT_TIME;
882 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
883 gfs2_dinode_out(ip, dibh->b_data);
884 brelse(dibh);
885out:
886 gfs2_trans_end(GFS2_SB(&ip->i_inode));
887 return error;
888}
889
890static int ea_set_simple_alloc(struct gfs2_inode *ip,
891 struct gfs2_ea_request *er, void *private)
892{
893 struct ea_set *es = private;
894 struct gfs2_ea_header *ea = es->es_ea;
895 int error;
896
897 gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
898
899 if (es->ea_split)
900 ea = ea_split_ea(ea);
901
902 error = ea_write(ip, ea, er);
903 if (error)
904 return error;
905
906 if (es->es_el)
907 ea_set_remove_stuffed(ip, es->es_el);
908
909 return 0;
910}
911
912static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
913 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
914 void *private)
915{
916 struct ea_set *es = private;
917 unsigned int size;
918 int stuffed;
919 int error;
920
921 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
922 es->es_er->er_data_len, &size);
923
924 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
925 if (GFS2_EA_REC_LEN(ea) < size)
926 return 0;
927 if (!GFS2_EA_IS_STUFFED(ea)) {
928 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
929 if (error)
930 return error;
931 }
932 es->ea_split = 0;
933 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
934 es->ea_split = 1;
935 else
936 return 0;
937
938 if (stuffed) {
939 error = ea_set_simple_noalloc(ip, bh, ea, es);
940 if (error)
941 return error;
942 } else {
943 unsigned int blks;
944
945 es->es_bh = bh;
946 es->es_ea = ea;
947 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
948 GFS2_SB(&ip->i_inode)->sd_jbsize);
949
950 error = ea_alloc_skeleton(ip, es->es_er, blks,
951 ea_set_simple_alloc, es);
952 if (error)
953 return error;
954 }
955
956 return 1;
957}
958
959static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
960 void *private)
961{
962 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
963 struct buffer_head *indbh, *newbh;
964 __be64 *eablk;
965 int error;
966 int mh_size = sizeof(struct gfs2_meta_header);
967
968 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
969 __be64 *end;
970
971 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
972 &indbh);
973 if (error)
974 return error;
975
976 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
977 error = -EIO;
978 goto out;
979 }
980
981 eablk = (__be64 *)(indbh->b_data + mh_size);
982 end = eablk + sdp->sd_inptrs;
983
984 for (; eablk < end; eablk++)
985 if (!*eablk)
986 break;
987
988 if (eablk == end) {
989 error = -ENOSPC;
990 goto out;
991 }
992
993 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
994 } else {
995 u64 blk;
996 unsigned int n = 1;
997 error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
998 if (error)
999 return error;
1000 gfs2_trans_add_unrevoke(sdp, blk, 1);
1001 indbh = gfs2_meta_new(ip->i_gl, blk);
1002 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1003 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1004 gfs2_buffer_clear_tail(indbh, mh_size);
1005
1006 eablk = (__be64 *)(indbh->b_data + mh_size);
1007 *eablk = cpu_to_be64(ip->i_eattr);
1008 ip->i_eattr = blk;
1009 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1010 gfs2_add_inode_blocks(&ip->i_inode, 1);
1011
1012 eablk++;
1013 }
1014
1015 error = ea_alloc_blk(ip, &newbh);
1016 if (error)
1017 goto out;
1018
1019 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1020 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1021 brelse(newbh);
1022 if (error)
1023 goto out;
1024
1025 if (private)
1026 ea_set_remove_stuffed(ip, private);
1027
1028out:
1029 brelse(indbh);
1030 return error;
1031}
1032
1033static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1034 const void *value, size_t size, struct gfs2_ea_location *el)
1035{
1036 struct gfs2_ea_request er;
1037 struct ea_set es;
1038 unsigned int blks = 2;
1039 int error;
1040
1041 er.er_type = type;
1042 er.er_name = name;
1043 er.er_data = (void *)value;
1044 er.er_name_len = strlen(name);
1045 er.er_data_len = size;
1046
1047 memset(&es, 0, sizeof(struct ea_set));
1048 es.es_er = &er;
1049 es.es_el = el;
1050
1051 error = ea_foreach(ip, ea_set_simple, &es);
1052 if (error > 0)
1053 return 0;
1054 if (error)
1055 return error;
1056
1057 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1058 blks++;
1059 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1060 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1061
1062 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1063}
1064
1065static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1066 struct gfs2_ea_location *el)
1067{
1068 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1069 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1070 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1071 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1072 }
1073
1074 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1075}
1076
1077static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1078{
1079 struct gfs2_ea_header *ea = el->el_ea;
1080 struct gfs2_ea_header *prev = el->el_prev;
1081 struct buffer_head *dibh;
1082 int error;
1083
1084 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1085 if (error)
1086 return error;
1087
1088 gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1089
1090 if (prev) {
1091 u32 len;
1092
1093 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1094 prev->ea_rec_len = cpu_to_be32(len);
1095
1096 if (GFS2_EA_IS_LAST(ea))
1097 prev->ea_flags |= GFS2_EAFLAG_LAST;
1098 } else {
1099 ea->ea_type = GFS2_EATYPE_UNUSED;
1100 }
1101
1102 error = gfs2_meta_inode_buffer(ip, &dibh);
1103 if (!error) {
1104 ip->i_inode.i_ctime = CURRENT_TIME;
1105 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1106 gfs2_dinode_out(ip, dibh->b_data);
1107 brelse(dibh);
1108 }
1109
1110 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1111
1112 return error;
1113}
1114
1115/**
1116 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1117 * @ip: The inode
1118 * @type: The type of the extended attribute
1119 * @name: The name of the extended attribute
1120 *
1121 * This is not called directly by the VFS since we use the (common)
1122 * scheme of making a "set with NULL data" mean a remove request. Note
1123 * that this is different from a set with zero length data.
1124 *
1125 * Returns: 0, or errno on failure
1126 */
1127
1128static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1129{
1130 struct gfs2_ea_location el;
1131 int error;
1132
1133 if (!ip->i_eattr)
1134 return -ENODATA;
1135
1136 error = gfs2_ea_find(ip, type, name, &el);
1137 if (error)
1138 return error;
1139 if (!el.el_ea)
1140 return -ENODATA;
1141
1142 if (GFS2_EA_IS_STUFFED(el.el_ea))
1143 error = ea_remove_stuffed(ip, &el);
1144 else
1145 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1146
1147 brelse(el.el_bh);
1148
1149 return error;
1150}
1151
1152/**
1153 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1154 * @ip: The inode
1155 * @name: The name of the extended attribute
1156 * @value: The value of the extended attribute (NULL for remove)
1157 * @size: The size of the @value argument
1158 * @flags: Create or Replace
1159 * @type: The type of the extended attribute
1160 *
1161 * See gfs2_xattr_remove() for details of the removal of xattrs.
1162 *
1163 * Returns: 0 or errno on failure
1164 */
1165
1166int __gfs2_xattr_set(struct inode *inode, const char *name,
1167 const void *value, size_t size, int flags, int type)
1168{
1169 struct gfs2_inode *ip = GFS2_I(inode);
1170 struct gfs2_sbd *sdp = GFS2_SB(inode);
1171 struct gfs2_ea_location el;
1172 unsigned int namel = strlen(name);
1173 int error;
1174
1175 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1176 return -EPERM;
1177 if (namel > GFS2_EA_MAX_NAME_LEN)
1178 return -ERANGE;
1179
1180 if (value == NULL)
1181 return gfs2_xattr_remove(ip, type, name);
1182
1183 if (ea_check_size(sdp, namel, size))
1184 return -ERANGE;
1185
1186 if (!ip->i_eattr) {
1187 if (flags & XATTR_REPLACE)
1188 return -ENODATA;
1189 return ea_init(ip, type, name, value, size);
1190 }
1191
1192 error = gfs2_ea_find(ip, type, name, &el);
1193 if (error)
1194 return error;
1195
1196 if (el.el_ea) {
1197 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1198 brelse(el.el_bh);
1199 return -EPERM;
1200 }
1201
1202 error = -EEXIST;
1203 if (!(flags & XATTR_CREATE)) {
1204 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1205 error = ea_set_i(ip, type, name, value, size, &el);
1206 if (!error && unstuffed)
1207 ea_set_remove_unstuffed(ip, &el);
1208 }
1209
1210 brelse(el.el_bh);
1211 return error;
1212 }
1213
1214 error = -ENODATA;
1215 if (!(flags & XATTR_REPLACE))
1216 error = ea_set_i(ip, type, name, value, size, NULL);
1217
1218 return error;
1219}
1220
1221static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1222 const void *value, size_t size, int flags, int type)
1223{
1224 return __gfs2_xattr_set(dentry->d_inode, name, value,
1225 size, flags, type);
1226}
1227
1228static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1229 struct gfs2_ea_header *ea, char *data)
1230{
1231 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1232 struct buffer_head **bh;
1233 unsigned int amount = GFS2_EA_DATA_LEN(ea);
1234 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1235 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1236 unsigned int x;
1237 int error;
1238
1239 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1240 if (!bh)
1241 return -ENOMEM;
1242
1243 error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1244 if (error)
1245 goto out;
1246
1247 for (x = 0; x < nptrs; x++) {
1248 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1249 bh + x);
1250 if (error) {
1251 while (x--)
1252 brelse(bh[x]);
1253 goto fail;
1254 }
1255 dataptrs++;
1256 }
1257
1258 for (x = 0; x < nptrs; x++) {
1259 error = gfs2_meta_wait(sdp, bh[x]);
1260 if (error) {
1261 for (; x < nptrs; x++)
1262 brelse(bh[x]);
1263 goto fail;
1264 }
1265 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1266 for (; x < nptrs; x++)
1267 brelse(bh[x]);
1268 error = -EIO;
1269 goto fail;
1270 }
1271
1272 gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1273
1274 memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1275 (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1276
1277 amount -= sdp->sd_jbsize;
1278 data += sdp->sd_jbsize;
1279
1280 brelse(bh[x]);
1281 }
1282
1283out:
1284 kfree(bh);
1285 return error;
1286
1287fail:
1288 gfs2_trans_end(sdp);
1289 kfree(bh);
1290 return error;
1291}
1292
1293int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1294{
1295 struct inode *inode = &ip->i_inode;
1296 struct gfs2_sbd *sdp = GFS2_SB(inode);
1297 struct gfs2_ea_location el;
1298 int error;
1299
1300 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1301 if (error)
1302 return error;
1303
1304 if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1305 error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1306 if (error == 0) {
1307 gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1308 memcpy(GFS2_EA2DATA(el.el_ea), data,
1309 GFS2_EA_DATA_LEN(el.el_ea));
1310 }
1311 } else {
1312 error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1313 }
1314
1315 brelse(el.el_bh);
1316 if (error)
1317 return error;
1318
1319 error = gfs2_setattr_simple(inode, attr);
1320 gfs2_trans_end(sdp);
1321 return error;
1322}
1323
1324static int ea_dealloc_indirect(struct gfs2_inode *ip)
1325{
1326 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1327 struct gfs2_rgrp_list rlist;
1328 struct buffer_head *indbh, *dibh;
1329 __be64 *eablk, *end;
1330 unsigned int rg_blocks = 0;
1331 u64 bstart = 0;
1332 unsigned int blen = 0;
1333 unsigned int blks = 0;
1334 unsigned int x;
1335 int error;
1336
1337 error = gfs2_rindex_update(sdp);
1338 if (error)
1339 return error;
1340
1341 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1342
1343 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1344 if (error)
1345 return error;
1346
1347 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1348 error = -EIO;
1349 goto out;
1350 }
1351
1352 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1353 end = eablk + sdp->sd_inptrs;
1354
1355 for (; eablk < end; eablk++) {
1356 u64 bn;
1357
1358 if (!*eablk)
1359 break;
1360 bn = be64_to_cpu(*eablk);
1361
1362 if (bstart + blen == bn)
1363 blen++;
1364 else {
1365 if (bstart)
1366 gfs2_rlist_add(ip, &rlist, bstart);
1367 bstart = bn;
1368 blen = 1;
1369 }
1370 blks++;
1371 }
1372 if (bstart)
1373 gfs2_rlist_add(ip, &rlist, bstart);
1374 else
1375 goto out;
1376
1377 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1378
1379 for (x = 0; x < rlist.rl_rgrps; x++) {
1380 struct gfs2_rgrpd *rgd;
1381 rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1382 rg_blocks += rgd->rd_length;
1383 }
1384
1385 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1386 if (error)
1387 goto out_rlist_free;
1388
1389 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1390 RES_STATFS + RES_QUOTA, blks);
1391 if (error)
1392 goto out_gunlock;
1393
1394 gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1395
1396 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1397 bstart = 0;
1398 blen = 0;
1399
1400 for (; eablk < end; eablk++) {
1401 u64 bn;
1402
1403 if (!*eablk)
1404 break;
1405 bn = be64_to_cpu(*eablk);
1406
1407 if (bstart + blen == bn)
1408 blen++;
1409 else {
1410 if (bstart)
1411 gfs2_free_meta(ip, bstart, blen);
1412 bstart = bn;
1413 blen = 1;
1414 }
1415
1416 *eablk = 0;
1417 gfs2_add_inode_blocks(&ip->i_inode, -1);
1418 }
1419 if (bstart)
1420 gfs2_free_meta(ip, bstart, blen);
1421
1422 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1423
1424 error = gfs2_meta_inode_buffer(ip, &dibh);
1425 if (!error) {
1426 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1427 gfs2_dinode_out(ip, dibh->b_data);
1428 brelse(dibh);
1429 }
1430
1431 gfs2_trans_end(sdp);
1432
1433out_gunlock:
1434 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1435out_rlist_free:
1436 gfs2_rlist_free(&rlist);
1437out:
1438 brelse(indbh);
1439 return error;
1440}
1441
1442static int ea_dealloc_block(struct gfs2_inode *ip)
1443{
1444 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1445 struct gfs2_rgrpd *rgd;
1446 struct buffer_head *dibh;
1447 struct gfs2_holder gh;
1448 int error;
1449
1450 error = gfs2_rindex_update(sdp);
1451 if (error)
1452 return error;
1453
1454 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1455 if (!rgd) {
1456 gfs2_consist_inode(ip);
1457 return -EIO;
1458 }
1459
1460 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1461 if (error)
1462 return error;
1463
1464 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1465 RES_QUOTA, 1);
1466 if (error)
1467 goto out_gunlock;
1468
1469 gfs2_free_meta(ip, ip->i_eattr, 1);
1470
1471 ip->i_eattr = 0;
1472 gfs2_add_inode_blocks(&ip->i_inode, -1);
1473
1474 error = gfs2_meta_inode_buffer(ip, &dibh);
1475 if (!error) {
1476 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1477 gfs2_dinode_out(ip, dibh->b_data);
1478 brelse(dibh);
1479 }
1480
1481 gfs2_trans_end(sdp);
1482
1483out_gunlock:
1484 gfs2_glock_dq_uninit(&gh);
1485 return error;
1486}
1487
1488/**
1489 * gfs2_ea_dealloc - deallocate the extended attribute fork
1490 * @ip: the inode
1491 *
1492 * Returns: errno
1493 */
1494
1495int gfs2_ea_dealloc(struct gfs2_inode *ip)
1496{
1497 struct gfs2_qadata *qa;
1498 int error;
1499
1500 qa = gfs2_qadata_get(ip);
1501 if (!qa)
1502 return -ENOMEM;
1503
1504 error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1505 if (error)
1506 goto out_alloc;
1507
1508 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1509 if (error)
1510 goto out_quota;
1511
1512 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513 error = ea_dealloc_indirect(ip);
1514 if (error)
1515 goto out_quota;
1516 }
1517
1518 error = ea_dealloc_block(ip);
1519
1520out_quota:
1521 gfs2_quota_unhold(ip);
1522out_alloc:
1523 gfs2_qadata_put(ip);
1524 return error;
1525}
1526
1527static const struct xattr_handler gfs2_xattr_user_handler = {
1528 .prefix = XATTR_USER_PREFIX,
1529 .flags = GFS2_EATYPE_USR,
1530 .get = gfs2_xattr_get,
1531 .set = gfs2_xattr_set,
1532};
1533
1534static const struct xattr_handler gfs2_xattr_security_handler = {
1535 .prefix = XATTR_SECURITY_PREFIX,
1536 .flags = GFS2_EATYPE_SECURITY,
1537 .get = gfs2_xattr_get,
1538 .set = gfs2_xattr_set,
1539};
1540
1541const struct xattr_handler *gfs2_xattr_handlers[] = {
1542 &gfs2_xattr_user_handler,
1543 &gfs2_xattr_security_handler,
1544 &gfs2_xattr_system_handler,
1545 NULL,
1546};
1547