xref: /linux/fs/gfs2/xattr.c (revision 4413e16d9d21673bb5048a2e542f1aaa00015c2e)
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 
40 static 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 
58 static 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 
74 typedef 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 
78 static 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 
110 fail:
111 	gfs2_consist_inode(ip);
112 	return -EIO;
113 }
114 
115 static 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 	}
153 out:
154 	brelse(bh);
155 	return error;
156 }
157 
158 struct ea_find {
159 	int type;
160 	const char *name;
161 	size_t namel;
162 	struct gfs2_ea_location *ef_el;
163 };
164 
165 static 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 
189 static 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 
224 static 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 
319 out_gunlock:
320 	gfs2_glock_dq_uninit(&rg_gh);
321 	return error;
322 }
323 
324 static 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_QUOTA_CHANGE, NO_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);
341 out_alloc:
342 	return error;
343 }
344 
345 struct ea_list {
346 	struct gfs2_ea_request *ei_er;
347 	unsigned int ei_size;
348 };
349 
350 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
351 {
352 	switch (ea->ea_type) {
353 	case GFS2_EATYPE_USR:
354 		return 5 + ea->ea_name_len + 1;
355 	case GFS2_EATYPE_SYS:
356 		return 7 + ea->ea_name_len + 1;
357 	case GFS2_EATYPE_SECURITY:
358 		return 9 + ea->ea_name_len + 1;
359 	default:
360 		return 0;
361 	}
362 }
363 
364 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
365 		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
366 		     void *private)
367 {
368 	struct ea_list *ei = private;
369 	struct gfs2_ea_request *er = ei->ei_er;
370 	unsigned int ea_size = gfs2_ea_strlen(ea);
371 
372 	if (ea->ea_type == GFS2_EATYPE_UNUSED)
373 		return 0;
374 
375 	if (er->er_data_len) {
376 		char *prefix = NULL;
377 		unsigned int l = 0;
378 		char c = 0;
379 
380 		if (ei->ei_size + ea_size > er->er_data_len)
381 			return -ERANGE;
382 
383 		switch (ea->ea_type) {
384 		case GFS2_EATYPE_USR:
385 			prefix = "user.";
386 			l = 5;
387 			break;
388 		case GFS2_EATYPE_SYS:
389 			prefix = "system.";
390 			l = 7;
391 			break;
392 		case GFS2_EATYPE_SECURITY:
393 			prefix = "security.";
394 			l = 9;
395 			break;
396 		}
397 
398 		BUG_ON(l == 0);
399 
400 		memcpy(er->er_data + ei->ei_size, prefix, l);
401 		memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
402 		       ea->ea_name_len);
403 		memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
404 	}
405 
406 	ei->ei_size += ea_size;
407 
408 	return 0;
409 }
410 
411 /**
412  * gfs2_listxattr - List gfs2 extended attributes
413  * @dentry: The dentry whose inode we are interested in
414  * @buffer: The buffer to write the results
415  * @size: The size of the buffer
416  *
417  * Returns: actual size of data on success, -errno on error
418  */
419 
420 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
421 {
422 	struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
423 	struct gfs2_ea_request er;
424 	struct gfs2_holder i_gh;
425 	int error;
426 
427 	memset(&er, 0, sizeof(struct gfs2_ea_request));
428 	if (size) {
429 		er.er_data = buffer;
430 		er.er_data_len = size;
431 	}
432 
433 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
434 	if (error)
435 		return error;
436 
437 	if (ip->i_eattr) {
438 		struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
439 
440 		error = ea_foreach(ip, ea_list_i, &ei);
441 		if (!error)
442 			error = ei.ei_size;
443 	}
444 
445 	gfs2_glock_dq_uninit(&i_gh);
446 
447 	return error;
448 }
449 
450 /**
451  * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
452  *                     request buffer
453  * @ip: The GFS2 inode
454  * @ea: The extended attribute header structure
455  * @din: The data to be copied in
456  * @dout: The data to be copied out (one of din,dout will be NULL)
457  *
458  * Returns: errno
459  */
460 
461 static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
462 			       const char *din, char *dout)
463 {
464 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
465 	struct buffer_head **bh;
466 	unsigned int amount = GFS2_EA_DATA_LEN(ea);
467 	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
468 	__be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
469 	unsigned int x;
470 	int error = 0;
471 	unsigned char *pos;
472 	unsigned cp_size;
473 
474 	bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
475 	if (!bh)
476 		return -ENOMEM;
477 
478 	for (x = 0; x < nptrs; x++) {
479 		error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
480 				       bh + x);
481 		if (error) {
482 			while (x--)
483 				brelse(bh[x]);
484 			goto out;
485 		}
486 		dataptrs++;
487 	}
488 
489 	for (x = 0; x < nptrs; x++) {
490 		error = gfs2_meta_wait(sdp, bh[x]);
491 		if (error) {
492 			for (; x < nptrs; x++)
493 				brelse(bh[x]);
494 			goto out;
495 		}
496 		if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
497 			for (; x < nptrs; x++)
498 				brelse(bh[x]);
499 			error = -EIO;
500 			goto out;
501 		}
502 
503 		pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
504 		cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
505 
506 		if (dout) {
507 			memcpy(dout, pos, cp_size);
508 			dout += sdp->sd_jbsize;
509 		}
510 
511 		if (din) {
512 			gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
513 			memcpy(pos, din, cp_size);
514 			din += sdp->sd_jbsize;
515 		}
516 
517 		amount -= sdp->sd_jbsize;
518 		brelse(bh[x]);
519 	}
520 
521 out:
522 	kfree(bh);
523 	return error;
524 }
525 
526 static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
527 			    char *data, size_t size)
528 {
529 	int ret;
530 	size_t len = GFS2_EA_DATA_LEN(el->el_ea);
531 	if (len > size)
532 		return -ERANGE;
533 
534 	if (GFS2_EA_IS_STUFFED(el->el_ea)) {
535 		memcpy(data, GFS2_EA2DATA(el->el_ea), len);
536 		return len;
537 	}
538 	ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
539 	if (ret < 0)
540 		return ret;
541 	return len;
542 }
543 
544 int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
545 {
546 	struct gfs2_ea_location el;
547 	int error;
548 	int len;
549 	char *data;
550 
551 	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
552 	if (error)
553 		return error;
554 	if (!el.el_ea)
555 		goto out;
556 	if (!GFS2_EA_DATA_LEN(el.el_ea))
557 		goto out;
558 
559 	len = GFS2_EA_DATA_LEN(el.el_ea);
560 	data = kmalloc(len, GFP_NOFS);
561 	error = -ENOMEM;
562 	if (data == NULL)
563 		goto out;
564 
565 	error = gfs2_ea_get_copy(ip, &el, data, len);
566 	if (error < 0)
567 		kfree(data);
568 	else
569 		*ppdata = data;
570 out:
571 	brelse(el.el_bh);
572 	return error;
573 }
574 
575 /**
576  * gfs2_xattr_get - Get a GFS2 extended attribute
577  * @inode: The inode
578  * @name: The name of the extended attribute
579  * @buffer: The buffer to write the result into
580  * @size: The size of the buffer
581  * @type: The type of extended attribute
582  *
583  * Returns: actual size of data on success, -errno on error
584  */
585 static int gfs2_xattr_get(struct dentry *dentry, const char *name,
586 		void *buffer, size_t size, int type)
587 {
588 	struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
589 	struct gfs2_ea_location el;
590 	int error;
591 
592 	if (!ip->i_eattr)
593 		return -ENODATA;
594 	if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
595 		return -EINVAL;
596 
597 	error = gfs2_ea_find(ip, type, name, &el);
598 	if (error)
599 		return error;
600 	if (!el.el_ea)
601 		return -ENODATA;
602 	if (size)
603 		error = gfs2_ea_get_copy(ip, &el, buffer, size);
604 	else
605 		error = GFS2_EA_DATA_LEN(el.el_ea);
606 	brelse(el.el_bh);
607 
608 	return error;
609 }
610 
611 /**
612  * ea_alloc_blk - allocates a new block for extended attributes.
613  * @ip: A pointer to the inode that's getting extended attributes
614  * @bhp: Pointer to pointer to a struct buffer_head
615  *
616  * Returns: errno
617  */
618 
619 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
620 {
621 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
622 	struct gfs2_ea_header *ea;
623 	unsigned int n = 1;
624 	u64 block;
625 	int error;
626 
627 	error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
628 	if (error)
629 		return error;
630 	gfs2_trans_add_unrevoke(sdp, block, 1);
631 	*bhp = gfs2_meta_new(ip->i_gl, block);
632 	gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
633 	gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
634 	gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
635 
636 	ea = GFS2_EA_BH2FIRST(*bhp);
637 	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
638 	ea->ea_type = GFS2_EATYPE_UNUSED;
639 	ea->ea_flags = GFS2_EAFLAG_LAST;
640 	ea->ea_num_ptrs = 0;
641 
642 	gfs2_add_inode_blocks(&ip->i_inode, 1);
643 
644 	return 0;
645 }
646 
647 /**
648  * ea_write - writes the request info to an ea, creating new blocks if
649  *            necessary
650  * @ip: inode that is being modified
651  * @ea: the location of the new ea in a block
652  * @er: the write request
653  *
654  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
655  *
656  * returns : errno
657  */
658 
659 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
660 		    struct gfs2_ea_request *er)
661 {
662 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
663 	int error;
664 
665 	ea->ea_data_len = cpu_to_be32(er->er_data_len);
666 	ea->ea_name_len = er->er_name_len;
667 	ea->ea_type = er->er_type;
668 	ea->__pad = 0;
669 
670 	memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
671 
672 	if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
673 		ea->ea_num_ptrs = 0;
674 		memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
675 	} else {
676 		__be64 *dataptr = GFS2_EA2DATAPTRS(ea);
677 		const char *data = er->er_data;
678 		unsigned int data_len = er->er_data_len;
679 		unsigned int copy;
680 		unsigned int x;
681 
682 		ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
683 		for (x = 0; x < ea->ea_num_ptrs; x++) {
684 			struct buffer_head *bh;
685 			u64 block;
686 			int mh_size = sizeof(struct gfs2_meta_header);
687 			unsigned int n = 1;
688 
689 			error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
690 			if (error)
691 				return error;
692 			gfs2_trans_add_unrevoke(sdp, block, 1);
693 			bh = gfs2_meta_new(ip->i_gl, block);
694 			gfs2_trans_add_bh(ip->i_gl, bh, 1);
695 			gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
696 
697 			gfs2_add_inode_blocks(&ip->i_inode, 1);
698 
699 			copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
700 							   data_len;
701 			memcpy(bh->b_data + mh_size, data, copy);
702 			if (copy < sdp->sd_jbsize)
703 				memset(bh->b_data + mh_size + copy, 0,
704 				       sdp->sd_jbsize - copy);
705 
706 			*dataptr++ = cpu_to_be64(bh->b_blocknr);
707 			data += copy;
708 			data_len -= copy;
709 
710 			brelse(bh);
711 		}
712 
713 		gfs2_assert_withdraw(sdp, !data_len);
714 	}
715 
716 	return 0;
717 }
718 
719 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
720 				   struct gfs2_ea_request *er, void *private);
721 
722 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
723 			     unsigned int blks,
724 			     ea_skeleton_call_t skeleton_call, void *private)
725 {
726 	struct buffer_head *dibh;
727 	int error;
728 
729 	error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
730 	if (error)
731 		return error;
732 
733 	error = gfs2_quota_lock_check(ip);
734 	if (error)
735 		return error;
736 
737 	error = gfs2_inplace_reserve(ip, blks);
738 	if (error)
739 		goto out_gunlock_q;
740 
741 	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
742 				 blks + gfs2_rg_blocks(ip, blks) +
743 				 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
744 	if (error)
745 		goto out_ipres;
746 
747 	error = skeleton_call(ip, er, private);
748 	if (error)
749 		goto out_end_trans;
750 
751 	error = gfs2_meta_inode_buffer(ip, &dibh);
752 	if (!error) {
753 		ip->i_inode.i_ctime = CURRENT_TIME;
754 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
755 		gfs2_dinode_out(ip, dibh->b_data);
756 		brelse(dibh);
757 	}
758 
759 out_end_trans:
760 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
761 out_ipres:
762 	gfs2_inplace_release(ip);
763 out_gunlock_q:
764 	gfs2_quota_unlock(ip);
765 	return error;
766 }
767 
768 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
769 		     void *private)
770 {
771 	struct buffer_head *bh;
772 	int error;
773 
774 	error = ea_alloc_blk(ip, &bh);
775 	if (error)
776 		return error;
777 
778 	ip->i_eattr = bh->b_blocknr;
779 	error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
780 
781 	brelse(bh);
782 
783 	return error;
784 }
785 
786 /**
787  * ea_init - initializes a new eattr block
788  * @ip:
789  * @er:
790  *
791  * Returns: errno
792  */
793 
794 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
795 		   const void *data, size_t size)
796 {
797 	struct gfs2_ea_request er;
798 	unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
799 	unsigned int blks = 1;
800 
801 	er.er_type = type;
802 	er.er_name = name;
803 	er.er_name_len = strlen(name);
804 	er.er_data = (void *)data;
805 	er.er_data_len = size;
806 
807 	if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
808 		blks += DIV_ROUND_UP(er.er_data_len, jbsize);
809 
810 	return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
811 }
812 
813 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
814 {
815 	u32 ea_size = GFS2_EA_SIZE(ea);
816 	struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
817 				     ea_size);
818 	u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
819 	int last = ea->ea_flags & GFS2_EAFLAG_LAST;
820 
821 	ea->ea_rec_len = cpu_to_be32(ea_size);
822 	ea->ea_flags ^= last;
823 
824 	new->ea_rec_len = cpu_to_be32(new_size);
825 	new->ea_flags = last;
826 
827 	return new;
828 }
829 
830 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
831 				  struct gfs2_ea_location *el)
832 {
833 	struct gfs2_ea_header *ea = el->el_ea;
834 	struct gfs2_ea_header *prev = el->el_prev;
835 	u32 len;
836 
837 	gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
838 
839 	if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
840 		ea->ea_type = GFS2_EATYPE_UNUSED;
841 		return;
842 	} else if (GFS2_EA2NEXT(prev) != ea) {
843 		prev = GFS2_EA2NEXT(prev);
844 		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
845 	}
846 
847 	len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
848 	prev->ea_rec_len = cpu_to_be32(len);
849 
850 	if (GFS2_EA_IS_LAST(ea))
851 		prev->ea_flags |= GFS2_EAFLAG_LAST;
852 }
853 
854 struct ea_set {
855 	int ea_split;
856 
857 	struct gfs2_ea_request *es_er;
858 	struct gfs2_ea_location *es_el;
859 
860 	struct buffer_head *es_bh;
861 	struct gfs2_ea_header *es_ea;
862 };
863 
864 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
865 				 struct gfs2_ea_header *ea, struct ea_set *es)
866 {
867 	struct gfs2_ea_request *er = es->es_er;
868 	struct buffer_head *dibh;
869 	int error;
870 
871 	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
872 	if (error)
873 		return error;
874 
875 	gfs2_trans_add_bh(ip->i_gl, bh, 1);
876 
877 	if (es->ea_split)
878 		ea = ea_split_ea(ea);
879 
880 	ea_write(ip, ea, er);
881 
882 	if (es->es_el)
883 		ea_set_remove_stuffed(ip, es->es_el);
884 
885 	error = gfs2_meta_inode_buffer(ip, &dibh);
886 	if (error)
887 		goto out;
888 	ip->i_inode.i_ctime = CURRENT_TIME;
889 	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
890 	gfs2_dinode_out(ip, dibh->b_data);
891 	brelse(dibh);
892 out:
893 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
894 	return error;
895 }
896 
897 static int ea_set_simple_alloc(struct gfs2_inode *ip,
898 			       struct gfs2_ea_request *er, void *private)
899 {
900 	struct ea_set *es = private;
901 	struct gfs2_ea_header *ea = es->es_ea;
902 	int error;
903 
904 	gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
905 
906 	if (es->ea_split)
907 		ea = ea_split_ea(ea);
908 
909 	error = ea_write(ip, ea, er);
910 	if (error)
911 		return error;
912 
913 	if (es->es_el)
914 		ea_set_remove_stuffed(ip, es->es_el);
915 
916 	return 0;
917 }
918 
919 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
920 			 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
921 			 void *private)
922 {
923 	struct ea_set *es = private;
924 	unsigned int size;
925 	int stuffed;
926 	int error;
927 
928 	stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
929 			       es->es_er->er_data_len, &size);
930 
931 	if (ea->ea_type == GFS2_EATYPE_UNUSED) {
932 		if (GFS2_EA_REC_LEN(ea) < size)
933 			return 0;
934 		if (!GFS2_EA_IS_STUFFED(ea)) {
935 			error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
936 			if (error)
937 				return error;
938 		}
939 		es->ea_split = 0;
940 	} else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
941 		es->ea_split = 1;
942 	else
943 		return 0;
944 
945 	if (stuffed) {
946 		error = ea_set_simple_noalloc(ip, bh, ea, es);
947 		if (error)
948 			return error;
949 	} else {
950 		unsigned int blks;
951 
952 		es->es_bh = bh;
953 		es->es_ea = ea;
954 		blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
955 					GFS2_SB(&ip->i_inode)->sd_jbsize);
956 
957 		error = ea_alloc_skeleton(ip, es->es_er, blks,
958 					  ea_set_simple_alloc, es);
959 		if (error)
960 			return error;
961 	}
962 
963 	return 1;
964 }
965 
966 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
967 			void *private)
968 {
969 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
970 	struct buffer_head *indbh, *newbh;
971 	__be64 *eablk;
972 	int error;
973 	int mh_size = sizeof(struct gfs2_meta_header);
974 
975 	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
976 		__be64 *end;
977 
978 		error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
979 				       &indbh);
980 		if (error)
981 			return error;
982 
983 		if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
984 			error = -EIO;
985 			goto out;
986 		}
987 
988 		eablk = (__be64 *)(indbh->b_data + mh_size);
989 		end = eablk + sdp->sd_inptrs;
990 
991 		for (; eablk < end; eablk++)
992 			if (!*eablk)
993 				break;
994 
995 		if (eablk == end) {
996 			error = -ENOSPC;
997 			goto out;
998 		}
999 
1000 		gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1001 	} else {
1002 		u64 blk;
1003 		unsigned int n = 1;
1004 		error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1005 		if (error)
1006 			return error;
1007 		gfs2_trans_add_unrevoke(sdp, blk, 1);
1008 		indbh = gfs2_meta_new(ip->i_gl, blk);
1009 		gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1010 		gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1011 		gfs2_buffer_clear_tail(indbh, mh_size);
1012 
1013 		eablk = (__be64 *)(indbh->b_data + mh_size);
1014 		*eablk = cpu_to_be64(ip->i_eattr);
1015 		ip->i_eattr = blk;
1016 		ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1017 		gfs2_add_inode_blocks(&ip->i_inode, 1);
1018 
1019 		eablk++;
1020 	}
1021 
1022 	error = ea_alloc_blk(ip, &newbh);
1023 	if (error)
1024 		goto out;
1025 
1026 	*eablk = cpu_to_be64((u64)newbh->b_blocknr);
1027 	error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1028 	brelse(newbh);
1029 	if (error)
1030 		goto out;
1031 
1032 	if (private)
1033 		ea_set_remove_stuffed(ip, private);
1034 
1035 out:
1036 	brelse(indbh);
1037 	return error;
1038 }
1039 
1040 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1041 		    const void *value, size_t size, struct gfs2_ea_location *el)
1042 {
1043 	struct gfs2_ea_request er;
1044 	struct ea_set es;
1045 	unsigned int blks = 2;
1046 	int error;
1047 
1048 	er.er_type = type;
1049 	er.er_name = name;
1050 	er.er_data = (void *)value;
1051 	er.er_name_len = strlen(name);
1052 	er.er_data_len = size;
1053 
1054 	memset(&es, 0, sizeof(struct ea_set));
1055 	es.es_er = &er;
1056 	es.es_el = el;
1057 
1058 	error = ea_foreach(ip, ea_set_simple, &es);
1059 	if (error > 0)
1060 		return 0;
1061 	if (error)
1062 		return error;
1063 
1064 	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1065 		blks++;
1066 	if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1067 		blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1068 
1069 	return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1070 }
1071 
1072 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1073 				   struct gfs2_ea_location *el)
1074 {
1075 	if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1076 		el->el_prev = GFS2_EA2NEXT(el->el_prev);
1077 		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1078 				     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1079 	}
1080 
1081 	return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1082 }
1083 
1084 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1085 {
1086 	struct gfs2_ea_header *ea = el->el_ea;
1087 	struct gfs2_ea_header *prev = el->el_prev;
1088 	struct buffer_head *dibh;
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_bh(ip->i_gl, el->el_bh, 1);
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 	error = gfs2_meta_inode_buffer(ip, &dibh);
1110 	if (!error) {
1111 		ip->i_inode.i_ctime = CURRENT_TIME;
1112 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1113 		gfs2_dinode_out(ip, dibh->b_data);
1114 		brelse(dibh);
1115 	}
1116 
1117 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
1118 
1119 	return error;
1120 }
1121 
1122 /**
1123  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1124  * @ip: The inode
1125  * @type: The type of the extended attribute
1126  * @name: The name of the extended attribute
1127  *
1128  * This is not called directly by the VFS since we use the (common)
1129  * scheme of making a "set with NULL data" mean a remove request. Note
1130  * that this is different from a set with zero length data.
1131  *
1132  * Returns: 0, or errno on failure
1133  */
1134 
1135 static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1136 {
1137 	struct gfs2_ea_location el;
1138 	int error;
1139 
1140 	if (!ip->i_eattr)
1141 		return -ENODATA;
1142 
1143 	error = gfs2_ea_find(ip, type, name, &el);
1144 	if (error)
1145 		return error;
1146 	if (!el.el_ea)
1147 		return -ENODATA;
1148 
1149 	if (GFS2_EA_IS_STUFFED(el.el_ea))
1150 		error = ea_remove_stuffed(ip, &el);
1151 	else
1152 		error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1153 
1154 	brelse(el.el_bh);
1155 
1156 	return error;
1157 }
1158 
1159 /**
1160  * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1161  * @ip: The inode
1162  * @name: The name of the extended attribute
1163  * @value: The value of the extended attribute (NULL for remove)
1164  * @size: The size of the @value argument
1165  * @flags: Create or Replace
1166  * @type: The type of the extended attribute
1167  *
1168  * See gfs2_xattr_remove() for details of the removal of xattrs.
1169  *
1170  * Returns: 0 or errno on failure
1171  */
1172 
1173 int __gfs2_xattr_set(struct inode *inode, const char *name,
1174 		   const void *value, size_t size, int flags, int type)
1175 {
1176 	struct gfs2_inode *ip = GFS2_I(inode);
1177 	struct gfs2_sbd *sdp = GFS2_SB(inode);
1178 	struct gfs2_ea_location el;
1179 	unsigned int namel = strlen(name);
1180 	int error;
1181 
1182 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1183 		return -EPERM;
1184 	if (namel > GFS2_EA_MAX_NAME_LEN)
1185 		return -ERANGE;
1186 
1187 	if (value == NULL)
1188 		return gfs2_xattr_remove(ip, type, name);
1189 
1190 	if (ea_check_size(sdp, namel, size))
1191 		return -ERANGE;
1192 
1193 	if (!ip->i_eattr) {
1194 		if (flags & XATTR_REPLACE)
1195 			return -ENODATA;
1196 		return ea_init(ip, type, name, value, size);
1197 	}
1198 
1199 	error = gfs2_ea_find(ip, type, name, &el);
1200 	if (error)
1201 		return error;
1202 
1203 	if (el.el_ea) {
1204 		if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1205 			brelse(el.el_bh);
1206 			return -EPERM;
1207 		}
1208 
1209 		error = -EEXIST;
1210 		if (!(flags & XATTR_CREATE)) {
1211 			int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1212 			error = ea_set_i(ip, type, name, value, size, &el);
1213 			if (!error && unstuffed)
1214 				ea_set_remove_unstuffed(ip, &el);
1215 		}
1216 
1217 		brelse(el.el_bh);
1218 		return error;
1219 	}
1220 
1221 	error = -ENODATA;
1222 	if (!(flags & XATTR_REPLACE))
1223 		error = ea_set_i(ip, type, name, value, size, NULL);
1224 
1225 	return error;
1226 }
1227 
1228 static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1229 		const void *value, size_t size, int flags, int type)
1230 {
1231 	return __gfs2_xattr_set(dentry->d_inode, name, value,
1232 				size, flags, type);
1233 }
1234 
1235 
1236 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1237 				  struct gfs2_ea_header *ea, char *data)
1238 {
1239 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1240 	unsigned int amount = GFS2_EA_DATA_LEN(ea);
1241 	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1242 	int ret;
1243 
1244 	ret = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1245 	if (ret)
1246 		return ret;
1247 
1248 	ret = gfs2_iter_unstuffed(ip, ea, data, NULL);
1249 	gfs2_trans_end(sdp);
1250 
1251 	return ret;
1252 }
1253 
1254 int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1255 {
1256 	struct inode *inode = &ip->i_inode;
1257 	struct gfs2_sbd *sdp = GFS2_SB(inode);
1258 	struct gfs2_ea_location el;
1259 	int error;
1260 
1261 	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1262 	if (error)
1263 		return error;
1264 
1265 	if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1266 		error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1267 		if (error == 0) {
1268 			gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1269 			memcpy(GFS2_EA2DATA(el.el_ea), data,
1270 			       GFS2_EA_DATA_LEN(el.el_ea));
1271 		}
1272 	} else {
1273 		error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1274 	}
1275 
1276 	brelse(el.el_bh);
1277 	if (error)
1278 		return error;
1279 
1280 	error = gfs2_setattr_simple(inode, attr);
1281 	gfs2_trans_end(sdp);
1282 	return error;
1283 }
1284 
1285 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1286 {
1287 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1288 	struct gfs2_rgrp_list rlist;
1289 	struct buffer_head *indbh, *dibh;
1290 	__be64 *eablk, *end;
1291 	unsigned int rg_blocks = 0;
1292 	u64 bstart = 0;
1293 	unsigned int blen = 0;
1294 	unsigned int blks = 0;
1295 	unsigned int x;
1296 	int error;
1297 
1298 	error = gfs2_rindex_update(sdp);
1299 	if (error)
1300 		return error;
1301 
1302 	memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1303 
1304 	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1305 	if (error)
1306 		return error;
1307 
1308 	if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1309 		error = -EIO;
1310 		goto out;
1311 	}
1312 
1313 	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1314 	end = eablk + sdp->sd_inptrs;
1315 
1316 	for (; eablk < end; eablk++) {
1317 		u64 bn;
1318 
1319 		if (!*eablk)
1320 			break;
1321 		bn = be64_to_cpu(*eablk);
1322 
1323 		if (bstart + blen == bn)
1324 			blen++;
1325 		else {
1326 			if (bstart)
1327 				gfs2_rlist_add(ip, &rlist, bstart);
1328 			bstart = bn;
1329 			blen = 1;
1330 		}
1331 		blks++;
1332 	}
1333 	if (bstart)
1334 		gfs2_rlist_add(ip, &rlist, bstart);
1335 	else
1336 		goto out;
1337 
1338 	gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1339 
1340 	for (x = 0; x < rlist.rl_rgrps; x++) {
1341 		struct gfs2_rgrpd *rgd;
1342 		rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1343 		rg_blocks += rgd->rd_length;
1344 	}
1345 
1346 	error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1347 	if (error)
1348 		goto out_rlist_free;
1349 
1350 	error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1351 				 RES_STATFS + RES_QUOTA, blks);
1352 	if (error)
1353 		goto out_gunlock;
1354 
1355 	gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1356 
1357 	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1358 	bstart = 0;
1359 	blen = 0;
1360 
1361 	for (; eablk < end; eablk++) {
1362 		u64 bn;
1363 
1364 		if (!*eablk)
1365 			break;
1366 		bn = be64_to_cpu(*eablk);
1367 
1368 		if (bstart + blen == bn)
1369 			blen++;
1370 		else {
1371 			if (bstart)
1372 				gfs2_free_meta(ip, bstart, blen);
1373 			bstart = bn;
1374 			blen = 1;
1375 		}
1376 
1377 		*eablk = 0;
1378 		gfs2_add_inode_blocks(&ip->i_inode, -1);
1379 	}
1380 	if (bstart)
1381 		gfs2_free_meta(ip, bstart, blen);
1382 
1383 	ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1384 
1385 	error = gfs2_meta_inode_buffer(ip, &dibh);
1386 	if (!error) {
1387 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1388 		gfs2_dinode_out(ip, dibh->b_data);
1389 		brelse(dibh);
1390 	}
1391 
1392 	gfs2_trans_end(sdp);
1393 
1394 out_gunlock:
1395 	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1396 out_rlist_free:
1397 	gfs2_rlist_free(&rlist);
1398 out:
1399 	brelse(indbh);
1400 	return error;
1401 }
1402 
1403 static int ea_dealloc_block(struct gfs2_inode *ip)
1404 {
1405 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1406 	struct gfs2_rgrpd *rgd;
1407 	struct buffer_head *dibh;
1408 	struct gfs2_holder gh;
1409 	int error;
1410 
1411 	error = gfs2_rindex_update(sdp);
1412 	if (error)
1413 		return error;
1414 
1415 	rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1416 	if (!rgd) {
1417 		gfs2_consist_inode(ip);
1418 		return -EIO;
1419 	}
1420 
1421 	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1422 	if (error)
1423 		return error;
1424 
1425 	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1426 				 RES_QUOTA, 1);
1427 	if (error)
1428 		goto out_gunlock;
1429 
1430 	gfs2_free_meta(ip, ip->i_eattr, 1);
1431 
1432 	ip->i_eattr = 0;
1433 	gfs2_add_inode_blocks(&ip->i_inode, -1);
1434 
1435 	error = gfs2_meta_inode_buffer(ip, &dibh);
1436 	if (!error) {
1437 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1438 		gfs2_dinode_out(ip, dibh->b_data);
1439 		brelse(dibh);
1440 	}
1441 
1442 	gfs2_trans_end(sdp);
1443 
1444 out_gunlock:
1445 	gfs2_glock_dq_uninit(&gh);
1446 	return error;
1447 }
1448 
1449 /**
1450  * gfs2_ea_dealloc - deallocate the extended attribute fork
1451  * @ip: the inode
1452  *
1453  * Returns: errno
1454  */
1455 
1456 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1457 {
1458 	int error;
1459 
1460 	error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1461 	if (error)
1462 		return error;
1463 
1464 	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1465 	if (error)
1466 		return error;
1467 
1468 	error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1469 	if (error)
1470 		goto out_quota;
1471 
1472 	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1473 		error = ea_dealloc_indirect(ip);
1474 		if (error)
1475 			goto out_quota;
1476 	}
1477 
1478 	error = ea_dealloc_block(ip);
1479 
1480 out_quota:
1481 	gfs2_quota_unhold(ip);
1482 	return error;
1483 }
1484 
1485 static const struct xattr_handler gfs2_xattr_user_handler = {
1486 	.prefix = XATTR_USER_PREFIX,
1487 	.flags  = GFS2_EATYPE_USR,
1488 	.get    = gfs2_xattr_get,
1489 	.set    = gfs2_xattr_set,
1490 };
1491 
1492 static const struct xattr_handler gfs2_xattr_security_handler = {
1493 	.prefix = XATTR_SECURITY_PREFIX,
1494 	.flags  = GFS2_EATYPE_SECURITY,
1495 	.get    = gfs2_xattr_get,
1496 	.set    = gfs2_xattr_set,
1497 };
1498 
1499 const struct xattr_handler *gfs2_xattr_handlers[] = {
1500 	&gfs2_xattr_user_handler,
1501 	&gfs2_xattr_security_handler,
1502 	&gfs2_xattr_system_handler,
1503 	NULL,
1504 };
1505 
1506