Loading...
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
5 */
6
7#include <linux/slab.h>
8#include <linux/spinlock.h>
9#include <linux/completion.h>
10#include <linux/buffer_head.h>
11#include <linux/xattr.h>
12#include <linux/gfs2_ondisk.h>
13#include <linux/posix_acl_xattr.h>
14#include <linux/uaccess.h>
15
16#include "gfs2.h"
17#include "incore.h"
18#include "acl.h"
19#include "xattr.h"
20#include "glock.h"
21#include "inode.h"
22#include "meta_io.h"
23#include "quota.h"
24#include "rgrp.h"
25#include "super.h"
26#include "trans.h"
27#include "util.h"
28
29/*
30 * ea_calc_size - returns the actual number of bytes the request will take up
31 * (not counting any unstuffed data blocks)
32 *
33 * Returns: 1 if the EA should be stuffed
34 */
35
36static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
37 unsigned int *size)
38{
39 unsigned int jbsize = sdp->sd_jbsize;
40
41 /* Stuffed */
42 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
43
44 if (*size <= jbsize)
45 return 1;
46
47 /* Unstuffed */
48 *size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
49 (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
50
51 return 0;
52}
53
54static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
55{
56 unsigned int size;
57
58 if (dsize > GFS2_EA_MAX_DATA_LEN)
59 return -ERANGE;
60
61 ea_calc_size(sdp, nsize, dsize, &size);
62
63 /* This can only happen with 512 byte blocks */
64 if (size > sdp->sd_jbsize)
65 return -ERANGE;
66
67 return 0;
68}
69
70static bool gfs2_eatype_valid(struct gfs2_sbd *sdp, u8 type)
71{
72 switch(sdp->sd_sb.sb_fs_format) {
73 case GFS2_FS_FORMAT_MAX:
74 return true;
75
76 case GFS2_FS_FORMAT_MIN:
77 return type <= GFS2_EATYPE_SECURITY;
78
79 default:
80 return false;
81 }
82}
83
84typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
85 struct gfs2_ea_header *ea,
86 struct gfs2_ea_header *prev, void *private);
87
88static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
89 ea_call_t ea_call, void *data)
90{
91 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
92 struct gfs2_ea_header *ea, *prev = NULL;
93 int error = 0;
94
95 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
96 return -EIO;
97
98 for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
99 if (!GFS2_EA_REC_LEN(ea)) {
100 gfs2_consist_inode(ip);
101 return -EIO;
102 }
103 if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
104 bh->b_data + bh->b_size)) {
105 gfs2_consist_inode(ip);
106 return -EIO;
107 }
108 if (!gfs2_eatype_valid(sdp, ea->ea_type)) {
109 gfs2_consist_inode(ip);
110 return -EIO;
111 }
112 error = ea_call(ip, bh, ea, prev, data);
113 if (error)
114 return error;
115
116 if (GFS2_EA_IS_LAST(ea)) {
117 if ((char *)GFS2_EA2NEXT(ea) !=
118 bh->b_data + bh->b_size) {
119 gfs2_consist_inode(ip);
120 return -EIO;
121 }
122 break;
123 }
124 }
125
126 return error;
127}
128
129static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
130{
131 struct buffer_head *bh, *eabh;
132 __be64 *eablk, *end;
133 int error;
134
135 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
136 if (error)
137 return error;
138
139 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
140 error = ea_foreach_i(ip, bh, ea_call, data);
141 goto out;
142 }
143
144 if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
145 error = -EIO;
146 goto out;
147 }
148
149 eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
150 end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
151
152 for (; eablk < end; eablk++) {
153 u64 bn;
154
155 if (!*eablk)
156 break;
157 bn = be64_to_cpu(*eablk);
158
159 error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
160 if (error)
161 break;
162 error = ea_foreach_i(ip, eabh, ea_call, data);
163 brelse(eabh);
164 if (error)
165 break;
166 }
167out:
168 brelse(bh);
169 return error;
170}
171
172struct ea_find {
173 int type;
174 const char *name;
175 size_t namel;
176 struct gfs2_ea_location *ef_el;
177};
178
179static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
180 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
181 void *private)
182{
183 struct ea_find *ef = private;
184
185 if (ea->ea_type == GFS2_EATYPE_UNUSED)
186 return 0;
187
188 if (ea->ea_type == ef->type) {
189 if (ea->ea_name_len == ef->namel &&
190 !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
191 struct gfs2_ea_location *el = ef->ef_el;
192 get_bh(bh);
193 el->el_bh = bh;
194 el->el_ea = ea;
195 el->el_prev = prev;
196 return 1;
197 }
198 }
199
200 return 0;
201}
202
203static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
204 struct gfs2_ea_location *el)
205{
206 struct ea_find ef;
207 int error;
208
209 ef.type = type;
210 ef.name = name;
211 ef.namel = strlen(name);
212 ef.ef_el = el;
213
214 memset(el, 0, sizeof(struct gfs2_ea_location));
215
216 error = ea_foreach(ip, ea_find_i, &ef);
217 if (error > 0)
218 return 0;
219
220 return error;
221}
222
223/*
224 * ea_dealloc_unstuffed
225 *
226 * Take advantage of the fact that all unstuffed blocks are
227 * allocated from the same RG. But watch, this may not always
228 * be true.
229 *
230 * Returns: errno
231 */
232
233static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
234 struct gfs2_ea_header *ea,
235 struct gfs2_ea_header *prev, void *private)
236{
237 int *leave = private;
238 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
239 struct gfs2_rgrpd *rgd;
240 struct gfs2_holder rg_gh;
241 __be64 *dataptrs;
242 u64 bn = 0;
243 u64 bstart = 0;
244 unsigned int blen = 0;
245 unsigned int blks = 0;
246 unsigned int x;
247 int error;
248
249 error = gfs2_rindex_update(sdp);
250 if (error)
251 return error;
252
253 if (GFS2_EA_IS_STUFFED(ea))
254 return 0;
255
256 dataptrs = GFS2_EA2DATAPTRS(ea);
257 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
258 if (*dataptrs) {
259 blks++;
260 bn = be64_to_cpu(*dataptrs);
261 }
262 }
263 if (!blks)
264 return 0;
265
266 rgd = gfs2_blk2rgrpd(sdp, bn, 1);
267 if (!rgd) {
268 gfs2_consist_inode(ip);
269 return -EIO;
270 }
271
272 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
273 LM_FLAG_NODE_SCOPE, &rg_gh);
274 if (error)
275 return error;
276
277 error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
278 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
279 if (error)
280 goto out_gunlock;
281
282 gfs2_trans_add_meta(ip->i_gl, bh);
283
284 dataptrs = GFS2_EA2DATAPTRS(ea);
285 for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
286 if (!*dataptrs)
287 break;
288 bn = be64_to_cpu(*dataptrs);
289
290 if (bstart + blen == bn)
291 blen++;
292 else {
293 if (bstart)
294 gfs2_free_meta(ip, rgd, bstart, blen);
295 bstart = bn;
296 blen = 1;
297 }
298
299 *dataptrs = 0;
300 gfs2_add_inode_blocks(&ip->i_inode, -1);
301 }
302 if (bstart)
303 gfs2_free_meta(ip, rgd, bstart, blen);
304
305 if (prev && !leave) {
306 u32 len;
307
308 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
309 prev->ea_rec_len = cpu_to_be32(len);
310
311 if (GFS2_EA_IS_LAST(ea))
312 prev->ea_flags |= GFS2_EAFLAG_LAST;
313 } else {
314 ea->ea_type = GFS2_EATYPE_UNUSED;
315 ea->ea_num_ptrs = 0;
316 }
317
318 inode_set_ctime_current(&ip->i_inode);
319 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
320
321 gfs2_trans_end(sdp);
322
323out_gunlock:
324 gfs2_glock_dq_uninit(&rg_gh);
325 return error;
326}
327
328static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
329 struct gfs2_ea_header *ea,
330 struct gfs2_ea_header *prev, int leave)
331{
332 int error;
333
334 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
335 if (error)
336 return error;
337
338 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
339 if (error)
340 goto out_alloc;
341
342 error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
343
344 gfs2_quota_unhold(ip);
345out_alloc:
346 return error;
347}
348
349struct ea_list {
350 struct gfs2_ea_request *ei_er;
351 unsigned int ei_size;
352};
353
354static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
355 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
356 void *private)
357{
358 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
359 struct ea_list *ei = private;
360 struct gfs2_ea_request *er = ei->ei_er;
361 unsigned int ea_size;
362 char *prefix;
363 unsigned int l;
364
365 if (ea->ea_type == GFS2_EATYPE_UNUSED)
366 return 0;
367
368 BUG_ON(ea->ea_type > GFS2_EATYPE_SECURITY &&
369 sdp->sd_sb.sb_fs_format == GFS2_FS_FORMAT_MIN);
370 switch (ea->ea_type) {
371 case GFS2_EATYPE_USR:
372 prefix = "user.";
373 l = 5;
374 break;
375 case GFS2_EATYPE_SYS:
376 prefix = "system.";
377 l = 7;
378 break;
379 case GFS2_EATYPE_SECURITY:
380 prefix = "security.";
381 l = 9;
382 break;
383 case GFS2_EATYPE_TRUSTED:
384 prefix = "trusted.";
385 l = 8;
386 break;
387 default:
388 return 0;
389 }
390
391 ea_size = l + ea->ea_name_len + 1;
392 if (er->er_data_len) {
393 if (ei->ei_size + ea_size > er->er_data_len)
394 return -ERANGE;
395
396 memcpy(er->er_data + ei->ei_size, prefix, l);
397 memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
398 ea->ea_name_len);
399 er->er_data[ei->ei_size + ea_size - 1] = 0;
400 }
401
402 ei->ei_size += ea_size;
403
404 return 0;
405}
406
407/**
408 * gfs2_listxattr - List gfs2 extended attributes
409 * @dentry: The dentry whose inode we are interested in
410 * @buffer: The buffer to write the results
411 * @size: The size of the buffer
412 *
413 * Returns: actual size of data on success, -errno on error
414 */
415
416ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
417{
418 struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
419 struct gfs2_ea_request er;
420 struct gfs2_holder i_gh;
421 int error;
422
423 memset(&er, 0, sizeof(struct gfs2_ea_request));
424 if (size) {
425 er.er_data = buffer;
426 er.er_data_len = size;
427 }
428
429 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
430 if (error)
431 return error;
432
433 if (ip->i_eattr) {
434 struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
435
436 error = ea_foreach(ip, ea_list_i, &ei);
437 if (!error)
438 error = ei.ei_size;
439 }
440
441 gfs2_glock_dq_uninit(&i_gh);
442
443 return error;
444}
445
446/**
447 * gfs2_iter_unstuffed - copies the unstuffed xattr data to/from the
448 * request buffer
449 * @ip: The GFS2 inode
450 * @ea: The extended attribute header structure
451 * @din: The data to be copied in
452 * @dout: The data to be copied out (one of din,dout will be NULL)
453 *
454 * Returns: errno
455 */
456
457static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
458 const char *din, char *dout)
459{
460 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
461 struct buffer_head **bh;
462 unsigned int amount = GFS2_EA_DATA_LEN(ea);
463 unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
464 __be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
465 unsigned int x;
466 int error = 0;
467 unsigned char *pos;
468 unsigned cp_size;
469
470 bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
471 if (!bh)
472 return -ENOMEM;
473
474 for (x = 0; x < nptrs; x++) {
475 error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
476 bh + x);
477 if (error) {
478 while (x--)
479 brelse(bh[x]);
480 goto out;
481 }
482 dataptrs++;
483 }
484
485 for (x = 0; x < nptrs; x++) {
486 error = gfs2_meta_wait(sdp, bh[x]);
487 if (error) {
488 for (; x < nptrs; x++)
489 brelse(bh[x]);
490 goto out;
491 }
492 if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
493 for (; x < nptrs; x++)
494 brelse(bh[x]);
495 error = -EIO;
496 goto out;
497 }
498
499 pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
500 cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
501
502 if (dout) {
503 memcpy(dout, pos, cp_size);
504 dout += sdp->sd_jbsize;
505 }
506
507 if (din) {
508 gfs2_trans_add_meta(ip->i_gl, bh[x]);
509 memcpy(pos, din, cp_size);
510 din += sdp->sd_jbsize;
511 }
512
513 amount -= sdp->sd_jbsize;
514 brelse(bh[x]);
515 }
516
517out:
518 kfree(bh);
519 return error;
520}
521
522static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
523 char *data, size_t size)
524{
525 int ret;
526 size_t len = GFS2_EA_DATA_LEN(el->el_ea);
527 if (len > size)
528 return -ERANGE;
529
530 if (GFS2_EA_IS_STUFFED(el->el_ea)) {
531 memcpy(data, GFS2_EA2DATA(el->el_ea), len);
532 return len;
533 }
534 ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
535 if (ret < 0)
536 return ret;
537 return len;
538}
539
540int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
541{
542 struct gfs2_ea_location el;
543 int error;
544 int len;
545 char *data;
546
547 error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
548 if (error)
549 return error;
550 if (!el.el_ea)
551 goto out;
552 if (!GFS2_EA_DATA_LEN(el.el_ea))
553 goto out;
554
555 len = GFS2_EA_DATA_LEN(el.el_ea);
556 data = kmalloc(len, GFP_NOFS);
557 error = -ENOMEM;
558 if (data == NULL)
559 goto out;
560
561 error = gfs2_ea_get_copy(ip, &el, data, len);
562 if (error < 0)
563 kfree(data);
564 else
565 *ppdata = data;
566out:
567 brelse(el.el_bh);
568 return error;
569}
570
571/**
572 * __gfs2_xattr_get - Get a GFS2 extended attribute
573 * @inode: The inode
574 * @name: The name of the extended attribute
575 * @buffer: The buffer to write the result into
576 * @size: The size of the buffer
577 * @type: The type of extended attribute
578 *
579 * Returns: actual size of data on success, -errno on error
580 */
581static int __gfs2_xattr_get(struct inode *inode, const char *name,
582 void *buffer, size_t size, int type)
583{
584 struct gfs2_inode *ip = GFS2_I(inode);
585 struct gfs2_ea_location el;
586 int error;
587
588 if (!ip->i_eattr)
589 return -ENODATA;
590 if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
591 return -EINVAL;
592
593 error = gfs2_ea_find(ip, type, name, &el);
594 if (error)
595 return error;
596 if (!el.el_ea)
597 return -ENODATA;
598 if (size)
599 error = gfs2_ea_get_copy(ip, &el, buffer, size);
600 else
601 error = GFS2_EA_DATA_LEN(el.el_ea);
602 brelse(el.el_bh);
603
604 return error;
605}
606
607static int gfs2_xattr_get(const struct xattr_handler *handler,
608 struct dentry *unused, struct inode *inode,
609 const char *name, void *buffer, size_t size)
610{
611 struct gfs2_inode *ip = GFS2_I(inode);
612 struct gfs2_holder gh;
613 int ret;
614
615 /* During lookup, SELinux calls this function with the glock locked. */
616
617 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
618 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
619 if (ret)
620 return ret;
621 } else {
622 gfs2_holder_mark_uninitialized(&gh);
623 }
624 ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
625 if (gfs2_holder_initialized(&gh))
626 gfs2_glock_dq_uninit(&gh);
627 return ret;
628}
629
630/**
631 * ea_alloc_blk - allocates a new block for extended attributes.
632 * @ip: A pointer to the inode that's getting extended attributes
633 * @bhp: Pointer to pointer to a struct buffer_head
634 *
635 * Returns: errno
636 */
637
638static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
639{
640 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
641 struct gfs2_ea_header *ea;
642 unsigned int n = 1;
643 u64 block;
644 int error;
645
646 error = gfs2_alloc_blocks(ip, &block, &n, 0);
647 if (error)
648 return error;
649 gfs2_trans_remove_revoke(sdp, block, 1);
650 *bhp = gfs2_meta_new(ip->i_gl, block);
651 gfs2_trans_add_meta(ip->i_gl, *bhp);
652 gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
653 gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
654
655 ea = GFS2_EA_BH2FIRST(*bhp);
656 ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
657 ea->ea_type = GFS2_EATYPE_UNUSED;
658 ea->ea_flags = GFS2_EAFLAG_LAST;
659 ea->ea_num_ptrs = 0;
660
661 gfs2_add_inode_blocks(&ip->i_inode, 1);
662
663 return 0;
664}
665
666/**
667 * ea_write - writes the request info to an ea, creating new blocks if
668 * necessary
669 * @ip: inode that is being modified
670 * @ea: the location of the new ea in a block
671 * @er: the write request
672 *
673 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
674 *
675 * returns : errno
676 */
677
678static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
679 struct gfs2_ea_request *er)
680{
681 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
682 int error;
683
684 ea->ea_data_len = cpu_to_be32(er->er_data_len);
685 ea->ea_name_len = er->er_name_len;
686 ea->ea_type = er->er_type;
687 ea->__pad = 0;
688
689 memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
690
691 if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
692 ea->ea_num_ptrs = 0;
693 memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
694 } else {
695 __be64 *dataptr = GFS2_EA2DATAPTRS(ea);
696 const char *data = er->er_data;
697 unsigned int data_len = er->er_data_len;
698 unsigned int copy;
699 unsigned int x;
700
701 ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
702 for (x = 0; x < ea->ea_num_ptrs; x++) {
703 struct buffer_head *bh;
704 u64 block;
705 int mh_size = sizeof(struct gfs2_meta_header);
706 unsigned int n = 1;
707
708 error = gfs2_alloc_blocks(ip, &block, &n, 0);
709 if (error)
710 return error;
711 gfs2_trans_remove_revoke(sdp, block, 1);
712 bh = gfs2_meta_new(ip->i_gl, block);
713 gfs2_trans_add_meta(ip->i_gl, bh);
714 gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
715
716 gfs2_add_inode_blocks(&ip->i_inode, 1);
717
718 copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
719 data_len;
720 memcpy(bh->b_data + mh_size, data, copy);
721 if (copy < sdp->sd_jbsize)
722 memset(bh->b_data + mh_size + copy, 0,
723 sdp->sd_jbsize - copy);
724
725 *dataptr++ = cpu_to_be64(bh->b_blocknr);
726 data += copy;
727 data_len -= copy;
728
729 brelse(bh);
730 }
731
732 gfs2_assert_withdraw(sdp, !data_len);
733 }
734
735 return 0;
736}
737
738typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
739 struct gfs2_ea_request *er, void *private);
740
741static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
742 unsigned int blks,
743 ea_skeleton_call_t skeleton_call, void *private)
744{
745 struct gfs2_alloc_parms ap = { .target = blks };
746 int error;
747
748 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
749 if (error)
750 return error;
751
752 error = gfs2_quota_lock_check(ip, &ap);
753 if (error)
754 return error;
755
756 error = gfs2_inplace_reserve(ip, &ap);
757 if (error)
758 goto out_gunlock_q;
759
760 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
761 blks + gfs2_rg_blocks(ip, blks) +
762 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
763 if (error)
764 goto out_ipres;
765
766 error = skeleton_call(ip, er, private);
767 if (error)
768 goto out_end_trans;
769
770 inode_set_ctime_current(&ip->i_inode);
771 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
772
773out_end_trans:
774 gfs2_trans_end(GFS2_SB(&ip->i_inode));
775out_ipres:
776 gfs2_inplace_release(ip);
777out_gunlock_q:
778 gfs2_quota_unlock(ip);
779 return error;
780}
781
782static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
783 void *private)
784{
785 struct buffer_head *bh;
786 int error;
787
788 error = ea_alloc_blk(ip, &bh);
789 if (error)
790 return error;
791
792 ip->i_eattr = bh->b_blocknr;
793 error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
794
795 brelse(bh);
796
797 return error;
798}
799
800/*
801 * ea_init - initializes a new eattr block
802 *
803 * Returns: errno
804 */
805static int ea_init(struct gfs2_inode *ip, int type, const char *name,
806 const void *data, size_t size)
807{
808 struct gfs2_ea_request er;
809 unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
810 unsigned int blks = 1;
811
812 er.er_type = type;
813 er.er_name = name;
814 er.er_name_len = strlen(name);
815 er.er_data = (void *)data;
816 er.er_data_len = size;
817
818 if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
819 blks += DIV_ROUND_UP(er.er_data_len, jbsize);
820
821 return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
822}
823
824static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
825{
826 u32 ea_size = GFS2_EA_SIZE(ea);
827 struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
828 ea_size);
829 u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
830 int last = ea->ea_flags & GFS2_EAFLAG_LAST;
831
832 ea->ea_rec_len = cpu_to_be32(ea_size);
833 ea->ea_flags ^= last;
834
835 new->ea_rec_len = cpu_to_be32(new_size);
836 new->ea_flags = last;
837
838 return new;
839}
840
841static void ea_set_remove_stuffed(struct gfs2_inode *ip,
842 struct gfs2_ea_location *el)
843{
844 struct gfs2_ea_header *ea = el->el_ea;
845 struct gfs2_ea_header *prev = el->el_prev;
846 u32 len;
847
848 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
849
850 if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
851 ea->ea_type = GFS2_EATYPE_UNUSED;
852 return;
853 } else if (GFS2_EA2NEXT(prev) != ea) {
854 prev = GFS2_EA2NEXT(prev);
855 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
856 }
857
858 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
859 prev->ea_rec_len = cpu_to_be32(len);
860
861 if (GFS2_EA_IS_LAST(ea))
862 prev->ea_flags |= GFS2_EAFLAG_LAST;
863}
864
865struct ea_set {
866 int ea_split;
867
868 struct gfs2_ea_request *es_er;
869 struct gfs2_ea_location *es_el;
870
871 struct buffer_head *es_bh;
872 struct gfs2_ea_header *es_ea;
873};
874
875static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
876 struct gfs2_ea_header *ea, struct ea_set *es)
877{
878 struct gfs2_ea_request *er = es->es_er;
879 int error;
880
881 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
882 if (error)
883 return error;
884
885 gfs2_trans_add_meta(ip->i_gl, bh);
886
887 if (es->ea_split)
888 ea = ea_split_ea(ea);
889
890 ea_write(ip, ea, er);
891
892 if (es->es_el)
893 ea_set_remove_stuffed(ip, es->es_el);
894
895 inode_set_ctime_current(&ip->i_inode);
896 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
897
898 gfs2_trans_end(GFS2_SB(&ip->i_inode));
899 return error;
900}
901
902static int ea_set_simple_alloc(struct gfs2_inode *ip,
903 struct gfs2_ea_request *er, void *private)
904{
905 struct ea_set *es = private;
906 struct gfs2_ea_header *ea = es->es_ea;
907 int error;
908
909 gfs2_trans_add_meta(ip->i_gl, es->es_bh);
910
911 if (es->ea_split)
912 ea = ea_split_ea(ea);
913
914 error = ea_write(ip, ea, er);
915 if (error)
916 return error;
917
918 if (es->es_el)
919 ea_set_remove_stuffed(ip, es->es_el);
920
921 return 0;
922}
923
924static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
925 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
926 void *private)
927{
928 struct ea_set *es = private;
929 unsigned int size;
930 int stuffed;
931 int error;
932
933 stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
934 es->es_er->er_data_len, &size);
935
936 if (ea->ea_type == GFS2_EATYPE_UNUSED) {
937 if (GFS2_EA_REC_LEN(ea) < size)
938 return 0;
939 if (!GFS2_EA_IS_STUFFED(ea)) {
940 error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
941 if (error)
942 return error;
943 }
944 es->ea_split = 0;
945 } else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
946 es->ea_split = 1;
947 else
948 return 0;
949
950 if (stuffed) {
951 error = ea_set_simple_noalloc(ip, bh, ea, es);
952 if (error)
953 return error;
954 } else {
955 unsigned int blks;
956
957 es->es_bh = bh;
958 es->es_ea = ea;
959 blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
960 GFS2_SB(&ip->i_inode)->sd_jbsize);
961
962 error = ea_alloc_skeleton(ip, es->es_er, blks,
963 ea_set_simple_alloc, es);
964 if (error)
965 return error;
966 }
967
968 return 1;
969}
970
971static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
972 void *private)
973{
974 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
975 struct buffer_head *indbh, *newbh;
976 __be64 *eablk;
977 int error;
978 int mh_size = sizeof(struct gfs2_meta_header);
979
980 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
981 __be64 *end;
982
983 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
984 &indbh);
985 if (error)
986 return error;
987
988 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
989 error = -EIO;
990 goto out;
991 }
992
993 eablk = (__be64 *)(indbh->b_data + mh_size);
994 end = eablk + sdp->sd_inptrs;
995
996 for (; eablk < end; eablk++)
997 if (!*eablk)
998 break;
999
1000 if (eablk == end) {
1001 error = -ENOSPC;
1002 goto out;
1003 }
1004
1005 gfs2_trans_add_meta(ip->i_gl, indbh);
1006 } else {
1007 u64 blk;
1008 unsigned int n = 1;
1009 error = gfs2_alloc_blocks(ip, &blk, &n, 0);
1010 if (error)
1011 return error;
1012 gfs2_trans_remove_revoke(sdp, blk, 1);
1013 indbh = gfs2_meta_new(ip->i_gl, blk);
1014 gfs2_trans_add_meta(ip->i_gl, indbh);
1015 gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1016 gfs2_buffer_clear_tail(indbh, mh_size);
1017
1018 eablk = (__be64 *)(indbh->b_data + mh_size);
1019 *eablk = cpu_to_be64(ip->i_eattr);
1020 ip->i_eattr = blk;
1021 ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1022 gfs2_add_inode_blocks(&ip->i_inode, 1);
1023
1024 eablk++;
1025 }
1026
1027 error = ea_alloc_blk(ip, &newbh);
1028 if (error)
1029 goto out;
1030
1031 *eablk = cpu_to_be64((u64)newbh->b_blocknr);
1032 error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1033 brelse(newbh);
1034 if (error)
1035 goto out;
1036
1037 if (private)
1038 ea_set_remove_stuffed(ip, private);
1039
1040out:
1041 brelse(indbh);
1042 return error;
1043}
1044
1045static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1046 const void *value, size_t size, struct gfs2_ea_location *el)
1047{
1048 struct gfs2_ea_request er;
1049 struct ea_set es;
1050 unsigned int blks = 2;
1051 int error;
1052
1053 er.er_type = type;
1054 er.er_name = name;
1055 er.er_data = (void *)value;
1056 er.er_name_len = strlen(name);
1057 er.er_data_len = size;
1058
1059 memset(&es, 0, sizeof(struct ea_set));
1060 es.es_er = &er;
1061 es.es_el = el;
1062
1063 error = ea_foreach(ip, ea_set_simple, &es);
1064 if (error > 0)
1065 return 0;
1066 if (error)
1067 return error;
1068
1069 if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1070 blks++;
1071 if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1072 blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1073
1074 return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1075}
1076
1077static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1078 struct gfs2_ea_location *el)
1079{
1080 if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1081 el->el_prev = GFS2_EA2NEXT(el->el_prev);
1082 gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1083 GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1084 }
1085
1086 return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1087}
1088
1089static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1090{
1091 struct gfs2_ea_header *ea = el->el_ea;
1092 struct gfs2_ea_header *prev = el->el_prev;
1093 int error;
1094
1095 error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1096 if (error)
1097 return error;
1098
1099 gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1100
1101 if (prev) {
1102 u32 len;
1103
1104 len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1105 prev->ea_rec_len = cpu_to_be32(len);
1106
1107 if (GFS2_EA_IS_LAST(ea))
1108 prev->ea_flags |= GFS2_EAFLAG_LAST;
1109 } else {
1110 ea->ea_type = GFS2_EATYPE_UNUSED;
1111 }
1112
1113 inode_set_ctime_current(&ip->i_inode);
1114 __mark_inode_dirty(&ip->i_inode, I_DIRTY_DATASYNC);
1115
1116 gfs2_trans_end(GFS2_SB(&ip->i_inode));
1117
1118 return error;
1119}
1120
1121/**
1122 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1123 * @ip: The inode
1124 * @type: The type of the extended attribute
1125 * @name: The name of the extended attribute
1126 *
1127 * This is not called directly by the VFS since we use the (common)
1128 * scheme of making a "set with NULL data" mean a remove request. Note
1129 * that this is different from a set with zero length data.
1130 *
1131 * Returns: 0, or errno on failure
1132 */
1133
1134static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1135{
1136 struct gfs2_ea_location el;
1137 int error;
1138
1139 if (!ip->i_eattr)
1140 return -ENODATA;
1141
1142 error = gfs2_ea_find(ip, type, name, &el);
1143 if (error)
1144 return error;
1145 if (!el.el_ea)
1146 return -ENODATA;
1147
1148 if (GFS2_EA_IS_STUFFED(el.el_ea))
1149 error = ea_remove_stuffed(ip, &el);
1150 else
1151 error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1152
1153 brelse(el.el_bh);
1154
1155 return error;
1156}
1157
1158/**
1159 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1160 * @inode: The inode
1161 * @name: The name of the extended attribute
1162 * @value: The value of the extended attribute (NULL for remove)
1163 * @size: The size of the @value argument
1164 * @flags: Create or Replace
1165 * @type: The type of the extended attribute
1166 *
1167 * See gfs2_xattr_remove() for details of the removal of xattrs.
1168 *
1169 * Returns: 0 or errno on failure
1170 */
1171
1172int __gfs2_xattr_set(struct inode *inode, const char *name,
1173 const void *value, size_t size, int flags, int type)
1174{
1175 struct gfs2_inode *ip = GFS2_I(inode);
1176 struct gfs2_sbd *sdp = GFS2_SB(inode);
1177 struct gfs2_ea_location el;
1178 unsigned int namel = strlen(name);
1179 int error;
1180
1181 if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1182 return -EPERM;
1183 if (namel > GFS2_EA_MAX_NAME_LEN)
1184 return -ERANGE;
1185
1186 if (value == NULL) {
1187 error = gfs2_xattr_remove(ip, type, name);
1188 if (error == -ENODATA && !(flags & XATTR_REPLACE))
1189 error = 0;
1190 return error;
1191 }
1192
1193 if (ea_check_size(sdp, namel, size))
1194 return -ERANGE;
1195
1196 if (!ip->i_eattr) {
1197 if (flags & XATTR_REPLACE)
1198 return -ENODATA;
1199 return ea_init(ip, type, name, value, size);
1200 }
1201
1202 error = gfs2_ea_find(ip, type, name, &el);
1203 if (error)
1204 return error;
1205
1206 if (el.el_ea) {
1207 if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1208 brelse(el.el_bh);
1209 return -EPERM;
1210 }
1211
1212 error = -EEXIST;
1213 if (!(flags & XATTR_CREATE)) {
1214 int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1215 error = ea_set_i(ip, type, name, value, size, &el);
1216 if (!error && unstuffed)
1217 ea_set_remove_unstuffed(ip, &el);
1218 }
1219
1220 brelse(el.el_bh);
1221 return error;
1222 }
1223
1224 error = -ENODATA;
1225 if (!(flags & XATTR_REPLACE))
1226 error = ea_set_i(ip, type, name, value, size, NULL);
1227
1228 return error;
1229}
1230
1231static int gfs2_xattr_set(const struct xattr_handler *handler,
1232 struct mnt_idmap *idmap,
1233 struct dentry *unused, struct inode *inode,
1234 const char *name, const void *value,
1235 size_t size, int flags)
1236{
1237 struct gfs2_inode *ip = GFS2_I(inode);
1238 struct gfs2_holder gh;
1239 int ret;
1240
1241 ret = gfs2_qa_get(ip);
1242 if (ret)
1243 return ret;
1244
1245 /* May be called from gfs_setattr with the glock locked. */
1246
1247 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
1248 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1249 if (ret)
1250 goto out;
1251 } else {
1252 if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE)) {
1253 ret = -EIO;
1254 goto out;
1255 }
1256 gfs2_holder_mark_uninitialized(&gh);
1257 }
1258 ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1259 if (gfs2_holder_initialized(&gh))
1260 gfs2_glock_dq_uninit(&gh);
1261out:
1262 gfs2_qa_put(ip);
1263 return ret;
1264}
1265
1266static int ea_dealloc_indirect(struct gfs2_inode *ip)
1267{
1268 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1269 struct gfs2_rgrp_list rlist;
1270 struct gfs2_rgrpd *rgd;
1271 struct buffer_head *indbh, *dibh;
1272 __be64 *eablk, *end;
1273 unsigned int rg_blocks = 0;
1274 u64 bstart = 0;
1275 unsigned int blen = 0;
1276 unsigned int blks = 0;
1277 unsigned int x;
1278 int error;
1279
1280 error = gfs2_rindex_update(sdp);
1281 if (error)
1282 return error;
1283
1284 memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1285
1286 error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1287 if (error)
1288 return error;
1289
1290 if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1291 error = -EIO;
1292 goto out;
1293 }
1294
1295 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1296 end = eablk + sdp->sd_inptrs;
1297
1298 for (; eablk < end; eablk++) {
1299 u64 bn;
1300
1301 if (!*eablk)
1302 break;
1303 bn = be64_to_cpu(*eablk);
1304
1305 if (bstart + blen == bn)
1306 blen++;
1307 else {
1308 if (bstart)
1309 gfs2_rlist_add(ip, &rlist, bstart);
1310 bstart = bn;
1311 blen = 1;
1312 }
1313 blks++;
1314 }
1315 if (bstart)
1316 gfs2_rlist_add(ip, &rlist, bstart);
1317 else
1318 goto out;
1319
1320 gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE, LM_FLAG_NODE_SCOPE);
1321
1322 for (x = 0; x < rlist.rl_rgrps; x++) {
1323 rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1324 rg_blocks += rgd->rd_length;
1325 }
1326
1327 error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1328 if (error)
1329 goto out_rlist_free;
1330
1331 error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1332 RES_STATFS + RES_QUOTA, blks);
1333 if (error)
1334 goto out_gunlock;
1335
1336 gfs2_trans_add_meta(ip->i_gl, indbh);
1337
1338 eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1339 bstart = 0;
1340 rgd = NULL;
1341 blen = 0;
1342
1343 for (; eablk < end; eablk++) {
1344 u64 bn;
1345
1346 if (!*eablk)
1347 break;
1348 bn = be64_to_cpu(*eablk);
1349
1350 if (bstart + blen == bn)
1351 blen++;
1352 else {
1353 if (bstart)
1354 gfs2_free_meta(ip, rgd, bstart, blen);
1355 bstart = bn;
1356 rgd = gfs2_blk2rgrpd(sdp, bstart, true);
1357 blen = 1;
1358 }
1359
1360 *eablk = 0;
1361 gfs2_add_inode_blocks(&ip->i_inode, -1);
1362 }
1363 if (bstart)
1364 gfs2_free_meta(ip, rgd, bstart, blen);
1365
1366 ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1367
1368 error = gfs2_meta_inode_buffer(ip, &dibh);
1369 if (!error) {
1370 gfs2_trans_add_meta(ip->i_gl, dibh);
1371 gfs2_dinode_out(ip, dibh->b_data);
1372 brelse(dibh);
1373 }
1374
1375 gfs2_trans_end(sdp);
1376
1377out_gunlock:
1378 gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1379out_rlist_free:
1380 gfs2_rlist_free(&rlist);
1381out:
1382 brelse(indbh);
1383 return error;
1384}
1385
1386static int ea_dealloc_block(struct gfs2_inode *ip)
1387{
1388 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1389 struct gfs2_rgrpd *rgd;
1390 struct buffer_head *dibh;
1391 struct gfs2_holder gh;
1392 int error;
1393
1394 error = gfs2_rindex_update(sdp);
1395 if (error)
1396 return error;
1397
1398 rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1399 if (!rgd) {
1400 gfs2_consist_inode(ip);
1401 return -EIO;
1402 }
1403
1404 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1405 LM_FLAG_NODE_SCOPE, &gh);
1406 if (error)
1407 return error;
1408
1409 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1410 RES_QUOTA, 1);
1411 if (error)
1412 goto out_gunlock;
1413
1414 gfs2_free_meta(ip, rgd, ip->i_eattr, 1);
1415
1416 ip->i_eattr = 0;
1417 gfs2_add_inode_blocks(&ip->i_inode, -1);
1418
1419 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1420 error = gfs2_meta_inode_buffer(ip, &dibh);
1421 if (!error) {
1422 gfs2_trans_add_meta(ip->i_gl, dibh);
1423 gfs2_dinode_out(ip, dibh->b_data);
1424 brelse(dibh);
1425 }
1426 }
1427
1428 gfs2_trans_end(sdp);
1429
1430out_gunlock:
1431 gfs2_glock_dq_uninit(&gh);
1432 return error;
1433}
1434
1435/**
1436 * gfs2_ea_dealloc - deallocate the extended attribute fork
1437 * @ip: the inode
1438 *
1439 * Returns: errno
1440 */
1441
1442int gfs2_ea_dealloc(struct gfs2_inode *ip)
1443{
1444 int error;
1445
1446 error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1447 if (error)
1448 return error;
1449
1450 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1451 if (error)
1452 return error;
1453
1454 if (likely(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags))) {
1455 error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1456 if (error)
1457 goto out_quota;
1458
1459 if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1460 error = ea_dealloc_indirect(ip);
1461 if (error)
1462 goto out_quota;
1463 }
1464 }
1465
1466 error = ea_dealloc_block(ip);
1467
1468out_quota:
1469 gfs2_quota_unhold(ip);
1470 return error;
1471}
1472
1473static const struct xattr_handler gfs2_xattr_user_handler = {
1474 .prefix = XATTR_USER_PREFIX,
1475 .flags = GFS2_EATYPE_USR,
1476 .get = gfs2_xattr_get,
1477 .set = gfs2_xattr_set,
1478};
1479
1480static const struct xattr_handler gfs2_xattr_security_handler = {
1481 .prefix = XATTR_SECURITY_PREFIX,
1482 .flags = GFS2_EATYPE_SECURITY,
1483 .get = gfs2_xattr_get,
1484 .set = gfs2_xattr_set,
1485};
1486
1487static bool
1488gfs2_xattr_trusted_list(struct dentry *dentry)
1489{
1490 return capable(CAP_SYS_ADMIN);
1491}
1492
1493static const struct xattr_handler gfs2_xattr_trusted_handler = {
1494 .prefix = XATTR_TRUSTED_PREFIX,
1495 .flags = GFS2_EATYPE_TRUSTED,
1496 .list = gfs2_xattr_trusted_list,
1497 .get = gfs2_xattr_get,
1498 .set = gfs2_xattr_set,
1499};
1500
1501const struct xattr_handler * const gfs2_xattr_handlers_max[] = {
1502 /* GFS2_FS_FORMAT_MAX */
1503 &gfs2_xattr_trusted_handler,
1504
1505 /* GFS2_FS_FORMAT_MIN */
1506 &gfs2_xattr_user_handler,
1507 &gfs2_xattr_security_handler,
1508 NULL,
1509};
1510
1511const struct xattr_handler * const *gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;
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 ip->i_inode.i_ctime = current_time(&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, NULL);
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, NULL);
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 ip->i_inode.i_ctime = current_time(&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 ip->i_inode.i_ctime = current_time(&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, NULL);
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 ip->i_inode.i_ctime = current_time(&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 user_namespace *mnt_userns,
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 *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 &posix_acl_access_xattr_handler,
1505 &posix_acl_default_xattr_handler,
1506 NULL,
1507};
1508
1509const struct xattr_handler **gfs2_xattr_handlers_min = gfs2_xattr_handlers_max + 1;