xref: /openbmc/linux/fs/gfs2/xattr.c (revision fd589a8f)
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 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 	if (GFS2_EA_IS_STUFFED(ea))
242 		return 0;
243 
244 	dataptrs = GFS2_EA2DATAPTRS(ea);
245 	for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
246 		if (*dataptrs) {
247 			blks++;
248 			bn = be64_to_cpu(*dataptrs);
249 		}
250 	}
251 	if (!blks)
252 		return 0;
253 
254 	rgd = gfs2_blk2rgrpd(sdp, bn);
255 	if (!rgd) {
256 		gfs2_consist_inode(ip);
257 		return -EIO;
258 	}
259 
260 	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
261 	if (error)
262 		return error;
263 
264 	error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
265 				 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
266 	if (error)
267 		goto out_gunlock;
268 
269 	gfs2_trans_add_bh(ip->i_gl, bh, 1);
270 
271 	dataptrs = GFS2_EA2DATAPTRS(ea);
272 	for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
273 		if (!*dataptrs)
274 			break;
275 		bn = be64_to_cpu(*dataptrs);
276 
277 		if (bstart + blen == bn)
278 			blen++;
279 		else {
280 			if (bstart)
281 				gfs2_free_meta(ip, bstart, blen);
282 			bstart = bn;
283 			blen = 1;
284 		}
285 
286 		*dataptrs = 0;
287 		gfs2_add_inode_blocks(&ip->i_inode, -1);
288 	}
289 	if (bstart)
290 		gfs2_free_meta(ip, bstart, blen);
291 
292 	if (prev && !leave) {
293 		u32 len;
294 
295 		len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
296 		prev->ea_rec_len = cpu_to_be32(len);
297 
298 		if (GFS2_EA_IS_LAST(ea))
299 			prev->ea_flags |= GFS2_EAFLAG_LAST;
300 	} else {
301 		ea->ea_type = GFS2_EATYPE_UNUSED;
302 		ea->ea_num_ptrs = 0;
303 	}
304 
305 	error = gfs2_meta_inode_buffer(ip, &dibh);
306 	if (!error) {
307 		ip->i_inode.i_ctime = CURRENT_TIME;
308 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
309 		gfs2_dinode_out(ip, dibh->b_data);
310 		brelse(dibh);
311 	}
312 
313 	gfs2_trans_end(sdp);
314 
315 out_gunlock:
316 	gfs2_glock_dq_uninit(&rg_gh);
317 	return error;
318 }
319 
320 static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
321 			       struct gfs2_ea_header *ea,
322 			       struct gfs2_ea_header *prev, int leave)
323 {
324 	struct gfs2_alloc *al;
325 	int error;
326 
327 	al = gfs2_alloc_get(ip);
328 	if (!al)
329 		return -ENOMEM;
330 
331 	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
332 	if (error)
333 		goto out_alloc;
334 
335 	error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
336 	if (error)
337 		goto out_quota;
338 
339 	error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
340 
341 	gfs2_glock_dq_uninit(&al->al_ri_gh);
342 
343 out_quota:
344 	gfs2_quota_unhold(ip);
345 out_alloc:
346 	gfs2_alloc_put(ip);
347 	return error;
348 }
349 
350 struct ea_list {
351 	struct gfs2_ea_request *ei_er;
352 	unsigned int ei_size;
353 };
354 
355 static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
356 {
357 	switch (ea->ea_type) {
358 	case GFS2_EATYPE_USR:
359 		return 5 + ea->ea_name_len + 1;
360 	case GFS2_EATYPE_SYS:
361 		return 7 + ea->ea_name_len + 1;
362 	case GFS2_EATYPE_SECURITY:
363 		return 9 + ea->ea_name_len + 1;
364 	default:
365 		return 0;
366 	}
367 }
368 
369 static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
370 		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
371 		     void *private)
372 {
373 	struct ea_list *ei = private;
374 	struct gfs2_ea_request *er = ei->ei_er;
375 	unsigned int ea_size = gfs2_ea_strlen(ea);
376 
377 	if (ea->ea_type == GFS2_EATYPE_UNUSED)
378 		return 0;
379 
380 	if (er->er_data_len) {
381 		char *prefix = NULL;
382 		unsigned int l = 0;
383 		char c = 0;
384 
385 		if (ei->ei_size + ea_size > er->er_data_len)
386 			return -ERANGE;
387 
388 		switch (ea->ea_type) {
389 		case GFS2_EATYPE_USR:
390 			prefix = "user.";
391 			l = 5;
392 			break;
393 		case GFS2_EATYPE_SYS:
394 			prefix = "system.";
395 			l = 7;
396 			break;
397 		case GFS2_EATYPE_SECURITY:
398 			prefix = "security.";
399 			l = 9;
400 			break;
401 		}
402 
403 		BUG_ON(l == 0);
404 
405 		memcpy(er->er_data + ei->ei_size, prefix, l);
406 		memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
407 		       ea->ea_name_len);
408 		memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
409 	}
410 
411 	ei->ei_size += ea_size;
412 
413 	return 0;
414 }
415 
416 /**
417  * gfs2_listxattr - List gfs2 extended attributes
418  * @dentry: The dentry whose inode we are interested in
419  * @buffer: The buffer to write the results
420  * @size: The size of the buffer
421  *
422  * Returns: actual size of data on success, -errno on error
423  */
424 
425 ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
426 {
427 	struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
428 	struct gfs2_ea_request er;
429 	struct gfs2_holder i_gh;
430 	int error;
431 
432 	memset(&er, 0, sizeof(struct gfs2_ea_request));
433 	if (size) {
434 		er.er_data = buffer;
435 		er.er_data_len = size;
436 	}
437 
438 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
439 	if (error)
440 		return error;
441 
442 	if (ip->i_eattr) {
443 		struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
444 
445 		error = ea_foreach(ip, ea_list_i, &ei);
446 		if (!error)
447 			error = ei.ei_size;
448 	}
449 
450 	gfs2_glock_dq_uninit(&i_gh);
451 
452 	return error;
453 }
454 
455 /**
456  * ea_get_unstuffed - actually copies the unstuffed data into the
457  *                    request buffer
458  * @ip: The GFS2 inode
459  * @ea: The extended attribute header structure
460  * @data: The data to be copied
461  *
462  * Returns: errno
463  */
464 
465 static int ea_get_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
466 			    char *data)
467 {
468 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
469 	struct buffer_head **bh;
470 	unsigned int amount = GFS2_EA_DATA_LEN(ea);
471 	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
472 	__be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
473 	unsigned int x;
474 	int error = 0;
475 
476 	bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
477 	if (!bh)
478 		return -ENOMEM;
479 
480 	for (x = 0; x < nptrs; x++) {
481 		error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
482 				       bh + x);
483 		if (error) {
484 			while (x--)
485 				brelse(bh[x]);
486 			goto out;
487 		}
488 		dataptrs++;
489 	}
490 
491 	for (x = 0; x < nptrs; x++) {
492 		error = gfs2_meta_wait(sdp, bh[x]);
493 		if (error) {
494 			for (; x < nptrs; x++)
495 				brelse(bh[x]);
496 			goto out;
497 		}
498 		if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
499 			for (; x < nptrs; x++)
500 				brelse(bh[x]);
501 			error = -EIO;
502 			goto out;
503 		}
504 
505 		memcpy(data, bh[x]->b_data + sizeof(struct gfs2_meta_header),
506 		       (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
507 
508 		amount -= sdp->sd_jbsize;
509 		data += sdp->sd_jbsize;
510 
511 		brelse(bh[x]);
512 	}
513 
514 out:
515 	kfree(bh);
516 	return error;
517 }
518 
519 int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
520 		     char *data, size_t size)
521 {
522 	int ret;
523 	size_t len = GFS2_EA_DATA_LEN(el->el_ea);
524 	if (len > size)
525 		return -ERANGE;
526 
527 	if (GFS2_EA_IS_STUFFED(el->el_ea)) {
528 		memcpy(data, GFS2_EA2DATA(el->el_ea), len);
529 		return len;
530 	}
531 	ret = ea_get_unstuffed(ip, el->el_ea, data);
532 	if (ret < 0)
533 		return ret;
534 	return len;
535 }
536 
537 /**
538  * gfs2_xattr_get - Get a GFS2 extended attribute
539  * @inode: The inode
540  * @type: The type of extended attribute
541  * @name: The name of the extended attribute
542  * @buffer: The buffer to write the result into
543  * @size: The size of the buffer
544  *
545  * Returns: actual size of data on success, -errno on error
546  */
547 
548 int gfs2_xattr_get(struct inode *inode, int type, const char *name,
549 		   void *buffer, size_t size)
550 {
551 	struct gfs2_inode *ip = GFS2_I(inode);
552 	struct gfs2_ea_location el;
553 	int error;
554 
555 	if (!ip->i_eattr)
556 		return -ENODATA;
557 	if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
558 		return -EINVAL;
559 
560 	error = gfs2_ea_find(ip, type, name, &el);
561 	if (error)
562 		return error;
563 	if (!el.el_ea)
564 		return -ENODATA;
565 	if (size)
566 		error = gfs2_ea_get_copy(ip, &el, buffer, size);
567 	else
568 		error = GFS2_EA_DATA_LEN(el.el_ea);
569 	brelse(el.el_bh);
570 
571 	return error;
572 }
573 
574 /**
575  * ea_alloc_blk - allocates a new block for extended attributes.
576  * @ip: A pointer to the inode that's getting extended attributes
577  * @bhp: Pointer to pointer to a struct buffer_head
578  *
579  * Returns: errno
580  */
581 
582 static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
583 {
584 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
585 	struct gfs2_ea_header *ea;
586 	unsigned int n = 1;
587 	u64 block;
588 	int error;
589 
590 	error = gfs2_alloc_block(ip, &block, &n);
591 	if (error)
592 		return error;
593 	gfs2_trans_add_unrevoke(sdp, block, 1);
594 	*bhp = gfs2_meta_new(ip->i_gl, block);
595 	gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
596 	gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
597 	gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
598 
599 	ea = GFS2_EA_BH2FIRST(*bhp);
600 	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
601 	ea->ea_type = GFS2_EATYPE_UNUSED;
602 	ea->ea_flags = GFS2_EAFLAG_LAST;
603 	ea->ea_num_ptrs = 0;
604 
605 	gfs2_add_inode_blocks(&ip->i_inode, 1);
606 
607 	return 0;
608 }
609 
610 /**
611  * ea_write - writes the request info to an ea, creating new blocks if
612  *            necessary
613  * @ip: inode that is being modified
614  * @ea: the location of the new ea in a block
615  * @er: the write request
616  *
617  * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
618  *
619  * returns : errno
620  */
621 
622 static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
623 		    struct gfs2_ea_request *er)
624 {
625 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
626 	int error;
627 
628 	ea->ea_data_len = cpu_to_be32(er->er_data_len);
629 	ea->ea_name_len = er->er_name_len;
630 	ea->ea_type = er->er_type;
631 	ea->__pad = 0;
632 
633 	memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
634 
635 	if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
636 		ea->ea_num_ptrs = 0;
637 		memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
638 	} else {
639 		__be64 *dataptr = GFS2_EA2DATAPTRS(ea);
640 		const char *data = er->er_data;
641 		unsigned int data_len = er->er_data_len;
642 		unsigned int copy;
643 		unsigned int x;
644 
645 		ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
646 		for (x = 0; x < ea->ea_num_ptrs; x++) {
647 			struct buffer_head *bh;
648 			u64 block;
649 			int mh_size = sizeof(struct gfs2_meta_header);
650 			unsigned int n = 1;
651 
652 			error = gfs2_alloc_block(ip, &block, &n);
653 			if (error)
654 				return error;
655 			gfs2_trans_add_unrevoke(sdp, block, 1);
656 			bh = gfs2_meta_new(ip->i_gl, block);
657 			gfs2_trans_add_bh(ip->i_gl, bh, 1);
658 			gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
659 
660 			gfs2_add_inode_blocks(&ip->i_inode, 1);
661 
662 			copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
663 							   data_len;
664 			memcpy(bh->b_data + mh_size, data, copy);
665 			if (copy < sdp->sd_jbsize)
666 				memset(bh->b_data + mh_size + copy, 0,
667 				       sdp->sd_jbsize - copy);
668 
669 			*dataptr++ = cpu_to_be64(bh->b_blocknr);
670 			data += copy;
671 			data_len -= copy;
672 
673 			brelse(bh);
674 		}
675 
676 		gfs2_assert_withdraw(sdp, !data_len);
677 	}
678 
679 	return 0;
680 }
681 
682 typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
683 				   struct gfs2_ea_request *er, void *private);
684 
685 static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
686 			     unsigned int blks,
687 			     ea_skeleton_call_t skeleton_call, void *private)
688 {
689 	struct gfs2_alloc *al;
690 	struct buffer_head *dibh;
691 	int error;
692 
693 	al = gfs2_alloc_get(ip);
694 	if (!al)
695 		return -ENOMEM;
696 
697 	error = gfs2_quota_lock_check(ip);
698 	if (error)
699 		goto out;
700 
701 	al->al_requested = blks;
702 
703 	error = gfs2_inplace_reserve(ip);
704 	if (error)
705 		goto out_gunlock_q;
706 
707 	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
708 				 blks + al->al_rgd->rd_length +
709 				 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
710 	if (error)
711 		goto out_ipres;
712 
713 	error = skeleton_call(ip, er, private);
714 	if (error)
715 		goto out_end_trans;
716 
717 	error = gfs2_meta_inode_buffer(ip, &dibh);
718 	if (!error) {
719 		ip->i_inode.i_ctime = CURRENT_TIME;
720 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
721 		gfs2_dinode_out(ip, dibh->b_data);
722 		brelse(dibh);
723 	}
724 
725 out_end_trans:
726 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
727 out_ipres:
728 	gfs2_inplace_release(ip);
729 out_gunlock_q:
730 	gfs2_quota_unlock(ip);
731 out:
732 	gfs2_alloc_put(ip);
733 	return error;
734 }
735 
736 static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
737 		     void *private)
738 {
739 	struct buffer_head *bh;
740 	int error;
741 
742 	error = ea_alloc_blk(ip, &bh);
743 	if (error)
744 		return error;
745 
746 	ip->i_eattr = bh->b_blocknr;
747 	error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
748 
749 	brelse(bh);
750 
751 	return error;
752 }
753 
754 /**
755  * ea_init - initializes a new eattr block
756  * @ip:
757  * @er:
758  *
759  * Returns: errno
760  */
761 
762 static int ea_init(struct gfs2_inode *ip, int type, const char *name,
763 		   const void *data, size_t size)
764 {
765 	struct gfs2_ea_request er;
766 	unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
767 	unsigned int blks = 1;
768 
769 	er.er_type = type;
770 	er.er_name = name;
771 	er.er_name_len = strlen(name);
772 	er.er_data = (void *)data;
773 	er.er_data_len = size;
774 
775 	if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
776 		blks += DIV_ROUND_UP(er.er_data_len, jbsize);
777 
778 	return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
779 }
780 
781 static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
782 {
783 	u32 ea_size = GFS2_EA_SIZE(ea);
784 	struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
785 				     ea_size);
786 	u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
787 	int last = ea->ea_flags & GFS2_EAFLAG_LAST;
788 
789 	ea->ea_rec_len = cpu_to_be32(ea_size);
790 	ea->ea_flags ^= last;
791 
792 	new->ea_rec_len = cpu_to_be32(new_size);
793 	new->ea_flags = last;
794 
795 	return new;
796 }
797 
798 static void ea_set_remove_stuffed(struct gfs2_inode *ip,
799 				  struct gfs2_ea_location *el)
800 {
801 	struct gfs2_ea_header *ea = el->el_ea;
802 	struct gfs2_ea_header *prev = el->el_prev;
803 	u32 len;
804 
805 	gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
806 
807 	if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
808 		ea->ea_type = GFS2_EATYPE_UNUSED;
809 		return;
810 	} else if (GFS2_EA2NEXT(prev) != ea) {
811 		prev = GFS2_EA2NEXT(prev);
812 		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
813 	}
814 
815 	len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
816 	prev->ea_rec_len = cpu_to_be32(len);
817 
818 	if (GFS2_EA_IS_LAST(ea))
819 		prev->ea_flags |= GFS2_EAFLAG_LAST;
820 }
821 
822 struct ea_set {
823 	int ea_split;
824 
825 	struct gfs2_ea_request *es_er;
826 	struct gfs2_ea_location *es_el;
827 
828 	struct buffer_head *es_bh;
829 	struct gfs2_ea_header *es_ea;
830 };
831 
832 static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
833 				 struct gfs2_ea_header *ea, struct ea_set *es)
834 {
835 	struct gfs2_ea_request *er = es->es_er;
836 	struct buffer_head *dibh;
837 	int error;
838 
839 	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
840 	if (error)
841 		return error;
842 
843 	gfs2_trans_add_bh(ip->i_gl, bh, 1);
844 
845 	if (es->ea_split)
846 		ea = ea_split_ea(ea);
847 
848 	ea_write(ip, ea, er);
849 
850 	if (es->es_el)
851 		ea_set_remove_stuffed(ip, es->es_el);
852 
853 	error = gfs2_meta_inode_buffer(ip, &dibh);
854 	if (error)
855 		goto out;
856 	ip->i_inode.i_ctime = CURRENT_TIME;
857 	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
858 	gfs2_dinode_out(ip, dibh->b_data);
859 	brelse(dibh);
860 out:
861 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
862 	return error;
863 }
864 
865 static int ea_set_simple_alloc(struct gfs2_inode *ip,
866 			       struct gfs2_ea_request *er, void *private)
867 {
868 	struct ea_set *es = private;
869 	struct gfs2_ea_header *ea = es->es_ea;
870 	int error;
871 
872 	gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
873 
874 	if (es->ea_split)
875 		ea = ea_split_ea(ea);
876 
877 	error = ea_write(ip, ea, er);
878 	if (error)
879 		return error;
880 
881 	if (es->es_el)
882 		ea_set_remove_stuffed(ip, es->es_el);
883 
884 	return 0;
885 }
886 
887 static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
888 			 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
889 			 void *private)
890 {
891 	struct ea_set *es = private;
892 	unsigned int size;
893 	int stuffed;
894 	int error;
895 
896 	stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
897 			       es->es_er->er_data_len, &size);
898 
899 	if (ea->ea_type == GFS2_EATYPE_UNUSED) {
900 		if (GFS2_EA_REC_LEN(ea) < size)
901 			return 0;
902 		if (!GFS2_EA_IS_STUFFED(ea)) {
903 			error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
904 			if (error)
905 				return error;
906 		}
907 		es->ea_split = 0;
908 	} else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
909 		es->ea_split = 1;
910 	else
911 		return 0;
912 
913 	if (stuffed) {
914 		error = ea_set_simple_noalloc(ip, bh, ea, es);
915 		if (error)
916 			return error;
917 	} else {
918 		unsigned int blks;
919 
920 		es->es_bh = bh;
921 		es->es_ea = ea;
922 		blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
923 					GFS2_SB(&ip->i_inode)->sd_jbsize);
924 
925 		error = ea_alloc_skeleton(ip, es->es_er, blks,
926 					  ea_set_simple_alloc, es);
927 		if (error)
928 			return error;
929 	}
930 
931 	return 1;
932 }
933 
934 static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
935 			void *private)
936 {
937 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
938 	struct buffer_head *indbh, *newbh;
939 	__be64 *eablk;
940 	int error;
941 	int mh_size = sizeof(struct gfs2_meta_header);
942 
943 	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
944 		__be64 *end;
945 
946 		error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
947 				       &indbh);
948 		if (error)
949 			return error;
950 
951 		if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
952 			error = -EIO;
953 			goto out;
954 		}
955 
956 		eablk = (__be64 *)(indbh->b_data + mh_size);
957 		end = eablk + sdp->sd_inptrs;
958 
959 		for (; eablk < end; eablk++)
960 			if (!*eablk)
961 				break;
962 
963 		if (eablk == end) {
964 			error = -ENOSPC;
965 			goto out;
966 		}
967 
968 		gfs2_trans_add_bh(ip->i_gl, indbh, 1);
969 	} else {
970 		u64 blk;
971 		unsigned int n = 1;
972 		error = gfs2_alloc_block(ip, &blk, &n);
973 		if (error)
974 			return error;
975 		gfs2_trans_add_unrevoke(sdp, blk, 1);
976 		indbh = gfs2_meta_new(ip->i_gl, blk);
977 		gfs2_trans_add_bh(ip->i_gl, indbh, 1);
978 		gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
979 		gfs2_buffer_clear_tail(indbh, mh_size);
980 
981 		eablk = (__be64 *)(indbh->b_data + mh_size);
982 		*eablk = cpu_to_be64(ip->i_eattr);
983 		ip->i_eattr = blk;
984 		ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
985 		gfs2_add_inode_blocks(&ip->i_inode, 1);
986 
987 		eablk++;
988 	}
989 
990 	error = ea_alloc_blk(ip, &newbh);
991 	if (error)
992 		goto out;
993 
994 	*eablk = cpu_to_be64((u64)newbh->b_blocknr);
995 	error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
996 	brelse(newbh);
997 	if (error)
998 		goto out;
999 
1000 	if (private)
1001 		ea_set_remove_stuffed(ip, private);
1002 
1003 out:
1004 	brelse(indbh);
1005 	return error;
1006 }
1007 
1008 static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1009 		    const void *value, size_t size, struct gfs2_ea_location *el)
1010 {
1011 	struct gfs2_ea_request er;
1012 	struct ea_set es;
1013 	unsigned int blks = 2;
1014 	int error;
1015 
1016 	er.er_type = type;
1017 	er.er_name = name;
1018 	er.er_data = (void *)value;
1019 	er.er_name_len = strlen(name);
1020 	er.er_data_len = size;
1021 
1022 	memset(&es, 0, sizeof(struct ea_set));
1023 	es.es_er = &er;
1024 	es.es_el = el;
1025 
1026 	error = ea_foreach(ip, ea_set_simple, &es);
1027 	if (error > 0)
1028 		return 0;
1029 	if (error)
1030 		return error;
1031 
1032 	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1033 		blks++;
1034 	if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1035 		blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1036 
1037 	return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1038 }
1039 
1040 static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1041 				   struct gfs2_ea_location *el)
1042 {
1043 	if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1044 		el->el_prev = GFS2_EA2NEXT(el->el_prev);
1045 		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1046 				     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1047 	}
1048 
1049 	return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1050 }
1051 
1052 static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1053 {
1054 	struct gfs2_ea_header *ea = el->el_ea;
1055 	struct gfs2_ea_header *prev = el->el_prev;
1056 	struct buffer_head *dibh;
1057 	int error;
1058 
1059 	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1060 	if (error)
1061 		return error;
1062 
1063 	gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1064 
1065 	if (prev) {
1066 		u32 len;
1067 
1068 		len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1069 		prev->ea_rec_len = cpu_to_be32(len);
1070 
1071 		if (GFS2_EA_IS_LAST(ea))
1072 			prev->ea_flags |= GFS2_EAFLAG_LAST;
1073 	} else {
1074 		ea->ea_type = GFS2_EATYPE_UNUSED;
1075 	}
1076 
1077 	error = gfs2_meta_inode_buffer(ip, &dibh);
1078 	if (!error) {
1079 		ip->i_inode.i_ctime = CURRENT_TIME;
1080 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1081 		gfs2_dinode_out(ip, dibh->b_data);
1082 		brelse(dibh);
1083 	}
1084 
1085 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
1086 
1087 	return error;
1088 }
1089 
1090 /**
1091  * gfs2_xattr_remove - Remove a GFS2 extended attribute
1092  * @inode: The inode
1093  * @type: The type of the extended attribute
1094  * @name: The name of the extended attribute
1095  *
1096  * This is not called directly by the VFS since we use the (common)
1097  * scheme of making a "set with NULL data" mean a remove request. Note
1098  * that this is different from a set with zero length data.
1099  *
1100  * Returns: 0, or errno on failure
1101  */
1102 
1103 static int gfs2_xattr_remove(struct inode *inode, int type, const char *name)
1104 {
1105 	struct gfs2_inode *ip = GFS2_I(inode);
1106 	struct gfs2_ea_location el;
1107 	int error;
1108 
1109 	if (!ip->i_eattr)
1110 		return -ENODATA;
1111 
1112 	error = gfs2_ea_find(ip, type, name, &el);
1113 	if (error)
1114 		return error;
1115 	if (!el.el_ea)
1116 		return -ENODATA;
1117 
1118 	if (GFS2_EA_IS_STUFFED(el.el_ea))
1119 		error = ea_remove_stuffed(ip, &el);
1120 	else
1121 		error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1122 
1123 	brelse(el.el_bh);
1124 
1125 	return error;
1126 }
1127 
1128 /**
1129  * gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1130  * @inode: The inode
1131  * @type: The type of the extended attribute
1132  * @name: The name of the extended attribute
1133  * @value: The value of the extended attribute (NULL for remove)
1134  * @size: The size of the @value argument
1135  * @flags: Create or Replace
1136  *
1137  * See gfs2_xattr_remove() for details of the removal of xattrs.
1138  *
1139  * Returns: 0 or errno on failure
1140  */
1141 
1142 int gfs2_xattr_set(struct inode *inode, int type, const char *name,
1143 		   const void *value, size_t size, int flags)
1144 {
1145 	struct gfs2_sbd *sdp = GFS2_SB(inode);
1146 	struct gfs2_inode *ip = GFS2_I(inode);
1147 	struct gfs2_ea_location el;
1148 	unsigned int namel = strlen(name);
1149 	int error;
1150 
1151 	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1152 		return -EPERM;
1153 	if (namel > GFS2_EA_MAX_NAME_LEN)
1154 		return -ERANGE;
1155 
1156 	if (value == NULL)
1157 		return gfs2_xattr_remove(inode, type, name);
1158 
1159 	if (ea_check_size(sdp, namel, size))
1160 		return -ERANGE;
1161 
1162 	if (!ip->i_eattr) {
1163 		if (flags & XATTR_REPLACE)
1164 			return -ENODATA;
1165 		return ea_init(ip, type, name, value, size);
1166 	}
1167 
1168 	error = gfs2_ea_find(ip, type, name, &el);
1169 	if (error)
1170 		return error;
1171 
1172 	if (el.el_ea) {
1173 		if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1174 			brelse(el.el_bh);
1175 			return -EPERM;
1176 		}
1177 
1178 		error = -EEXIST;
1179 		if (!(flags & XATTR_CREATE)) {
1180 			int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1181 			error = ea_set_i(ip, type, name, value, size, &el);
1182 			if (!error && unstuffed)
1183 				ea_set_remove_unstuffed(ip, &el);
1184 		}
1185 
1186 		brelse(el.el_bh);
1187 		return error;
1188 	}
1189 
1190 	error = -ENODATA;
1191 	if (!(flags & XATTR_REPLACE))
1192 		error = ea_set_i(ip, type, name, value, size, NULL);
1193 
1194 	return error;
1195 }
1196 
1197 static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1198 				  struct gfs2_ea_header *ea, char *data)
1199 {
1200 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1201 	struct buffer_head **bh;
1202 	unsigned int amount = GFS2_EA_DATA_LEN(ea);
1203 	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1204 	__be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1205 	unsigned int x;
1206 	int error;
1207 
1208 	bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1209 	if (!bh)
1210 		return -ENOMEM;
1211 
1212 	error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1213 	if (error)
1214 		goto out;
1215 
1216 	for (x = 0; x < nptrs; x++) {
1217 		error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1218 				       bh + x);
1219 		if (error) {
1220 			while (x--)
1221 				brelse(bh[x]);
1222 			goto fail;
1223 		}
1224 		dataptrs++;
1225 	}
1226 
1227 	for (x = 0; x < nptrs; x++) {
1228 		error = gfs2_meta_wait(sdp, bh[x]);
1229 		if (error) {
1230 			for (; x < nptrs; x++)
1231 				brelse(bh[x]);
1232 			goto fail;
1233 		}
1234 		if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1235 			for (; x < nptrs; x++)
1236 				brelse(bh[x]);
1237 			error = -EIO;
1238 			goto fail;
1239 		}
1240 
1241 		gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1242 
1243 		memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1244 		       (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1245 
1246 		amount -= sdp->sd_jbsize;
1247 		data += sdp->sd_jbsize;
1248 
1249 		brelse(bh[x]);
1250 	}
1251 
1252 out:
1253 	kfree(bh);
1254 	return error;
1255 
1256 fail:
1257 	gfs2_trans_end(sdp);
1258 	kfree(bh);
1259 	return error;
1260 }
1261 
1262 int gfs2_ea_acl_chmod(struct gfs2_inode *ip, struct gfs2_ea_location *el,
1263 		      struct iattr *attr, char *data)
1264 {
1265 	struct buffer_head *dibh;
1266 	int error;
1267 
1268 	if (GFS2_EA_IS_STUFFED(el->el_ea)) {
1269 		error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1270 		if (error)
1271 			return error;
1272 
1273 		gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1274 		memcpy(GFS2_EA2DATA(el->el_ea), data,
1275 		       GFS2_EA_DATA_LEN(el->el_ea));
1276 	} else
1277 		error = ea_acl_chmod_unstuffed(ip, el->el_ea, data);
1278 
1279 	if (error)
1280 		return error;
1281 
1282 	error = gfs2_meta_inode_buffer(ip, &dibh);
1283 	if (!error) {
1284 		error = inode_setattr(&ip->i_inode, attr);
1285 		gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
1286 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1287 		gfs2_dinode_out(ip, dibh->b_data);
1288 		brelse(dibh);
1289 	}
1290 
1291 	gfs2_trans_end(GFS2_SB(&ip->i_inode));
1292 
1293 	return error;
1294 }
1295 
1296 static int ea_dealloc_indirect(struct gfs2_inode *ip)
1297 {
1298 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1299 	struct gfs2_rgrp_list rlist;
1300 	struct buffer_head *indbh, *dibh;
1301 	__be64 *eablk, *end;
1302 	unsigned int rg_blocks = 0;
1303 	u64 bstart = 0;
1304 	unsigned int blen = 0;
1305 	unsigned int blks = 0;
1306 	unsigned int x;
1307 	int error;
1308 
1309 	memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1310 
1311 	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1312 	if (error)
1313 		return error;
1314 
1315 	if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1316 		error = -EIO;
1317 		goto out;
1318 	}
1319 
1320 	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1321 	end = eablk + sdp->sd_inptrs;
1322 
1323 	for (; eablk < end; eablk++) {
1324 		u64 bn;
1325 
1326 		if (!*eablk)
1327 			break;
1328 		bn = be64_to_cpu(*eablk);
1329 
1330 		if (bstart + blen == bn)
1331 			blen++;
1332 		else {
1333 			if (bstart)
1334 				gfs2_rlist_add(sdp, &rlist, bstart);
1335 			bstart = bn;
1336 			blen = 1;
1337 		}
1338 		blks++;
1339 	}
1340 	if (bstart)
1341 		gfs2_rlist_add(sdp, &rlist, bstart);
1342 	else
1343 		goto out;
1344 
1345 	gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1346 
1347 	for (x = 0; x < rlist.rl_rgrps; x++) {
1348 		struct gfs2_rgrpd *rgd;
1349 		rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1350 		rg_blocks += rgd->rd_length;
1351 	}
1352 
1353 	error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1354 	if (error)
1355 		goto out_rlist_free;
1356 
1357 	error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1358 				 RES_STATFS + RES_QUOTA, blks);
1359 	if (error)
1360 		goto out_gunlock;
1361 
1362 	gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1363 
1364 	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1365 	bstart = 0;
1366 	blen = 0;
1367 
1368 	for (; eablk < end; eablk++) {
1369 		u64 bn;
1370 
1371 		if (!*eablk)
1372 			break;
1373 		bn = be64_to_cpu(*eablk);
1374 
1375 		if (bstart + blen == bn)
1376 			blen++;
1377 		else {
1378 			if (bstart)
1379 				gfs2_free_meta(ip, bstart, blen);
1380 			bstart = bn;
1381 			blen = 1;
1382 		}
1383 
1384 		*eablk = 0;
1385 		gfs2_add_inode_blocks(&ip->i_inode, -1);
1386 	}
1387 	if (bstart)
1388 		gfs2_free_meta(ip, bstart, blen);
1389 
1390 	ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1391 
1392 	error = gfs2_meta_inode_buffer(ip, &dibh);
1393 	if (!error) {
1394 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1395 		gfs2_dinode_out(ip, dibh->b_data);
1396 		brelse(dibh);
1397 	}
1398 
1399 	gfs2_trans_end(sdp);
1400 
1401 out_gunlock:
1402 	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1403 out_rlist_free:
1404 	gfs2_rlist_free(&rlist);
1405 out:
1406 	brelse(indbh);
1407 	return error;
1408 }
1409 
1410 static int ea_dealloc_block(struct gfs2_inode *ip)
1411 {
1412 	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1413 	struct gfs2_alloc *al = ip->i_alloc;
1414 	struct gfs2_rgrpd *rgd;
1415 	struct buffer_head *dibh;
1416 	int error;
1417 
1418 	rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1419 	if (!rgd) {
1420 		gfs2_consist_inode(ip);
1421 		return -EIO;
1422 	}
1423 
1424 	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1425 				   &al->al_rgd_gh);
1426 	if (error)
1427 		return error;
1428 
1429 	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1430 				 RES_QUOTA, 1);
1431 	if (error)
1432 		goto out_gunlock;
1433 
1434 	gfs2_free_meta(ip, ip->i_eattr, 1);
1435 
1436 	ip->i_eattr = 0;
1437 	gfs2_add_inode_blocks(&ip->i_inode, -1);
1438 
1439 	error = gfs2_meta_inode_buffer(ip, &dibh);
1440 	if (!error) {
1441 		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1442 		gfs2_dinode_out(ip, dibh->b_data);
1443 		brelse(dibh);
1444 	}
1445 
1446 	gfs2_trans_end(sdp);
1447 
1448 out_gunlock:
1449 	gfs2_glock_dq_uninit(&al->al_rgd_gh);
1450 	return error;
1451 }
1452 
1453 /**
1454  * gfs2_ea_dealloc - deallocate the extended attribute fork
1455  * @ip: the inode
1456  *
1457  * Returns: errno
1458  */
1459 
1460 int gfs2_ea_dealloc(struct gfs2_inode *ip)
1461 {
1462 	struct gfs2_alloc *al;
1463 	int error;
1464 
1465 	al = gfs2_alloc_get(ip);
1466 	if (!al)
1467 		return -ENOMEM;
1468 
1469 	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1470 	if (error)
1471 		goto out_alloc;
1472 
1473 	error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1474 	if (error)
1475 		goto out_quota;
1476 
1477 	error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1478 	if (error)
1479 		goto out_rindex;
1480 
1481 	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1482 		error = ea_dealloc_indirect(ip);
1483 		if (error)
1484 			goto out_rindex;
1485 	}
1486 
1487 	error = ea_dealloc_block(ip);
1488 
1489 out_rindex:
1490 	gfs2_glock_dq_uninit(&al->al_ri_gh);
1491 out_quota:
1492 	gfs2_quota_unhold(ip);
1493 out_alloc:
1494 	gfs2_alloc_put(ip);
1495 	return error;
1496 }
1497 
1498 static int gfs2_xattr_user_get(struct inode *inode, const char *name,
1499 			       void *buffer, size_t size)
1500 {
1501 	return gfs2_xattr_get(inode, GFS2_EATYPE_USR, name, buffer, size);
1502 }
1503 
1504 static int gfs2_xattr_user_set(struct inode *inode, const char *name,
1505 			       const void *value, size_t size, int flags)
1506 {
1507 	return gfs2_xattr_set(inode, GFS2_EATYPE_USR, name, value, size, flags);
1508 }
1509 
1510 static int gfs2_xattr_system_get(struct inode *inode, const char *name,
1511 				 void *buffer, size_t size)
1512 {
1513 	return gfs2_xattr_get(inode, GFS2_EATYPE_SYS, name, buffer, size);
1514 }
1515 
1516 static int gfs2_xattr_system_set(struct inode *inode, const char *name,
1517 				 const void *value, size_t size, int flags)
1518 {
1519 	return gfs2_xattr_set(inode, GFS2_EATYPE_SYS, name, value, size, flags);
1520 }
1521 
1522 static int gfs2_xattr_security_get(struct inode *inode, const char *name,
1523 				   void *buffer, size_t size)
1524 {
1525 	return gfs2_xattr_get(inode, GFS2_EATYPE_SECURITY, name, buffer, size);
1526 }
1527 
1528 static int gfs2_xattr_security_set(struct inode *inode, const char *name,
1529 				   const void *value, size_t size, int flags)
1530 {
1531 	return gfs2_xattr_set(inode, GFS2_EATYPE_SECURITY, name, value, size, flags);
1532 }
1533 
1534 static struct xattr_handler gfs2_xattr_user_handler = {
1535 	.prefix = XATTR_USER_PREFIX,
1536 	.get    = gfs2_xattr_user_get,
1537 	.set    = gfs2_xattr_user_set,
1538 };
1539 
1540 static struct xattr_handler gfs2_xattr_security_handler = {
1541 	.prefix = XATTR_SECURITY_PREFIX,
1542 	.get    = gfs2_xattr_security_get,
1543 	.set    = gfs2_xattr_security_set,
1544 };
1545 
1546 static struct xattr_handler gfs2_xattr_system_handler = {
1547 	.prefix = XATTR_SYSTEM_PREFIX,
1548 	.get    = gfs2_xattr_system_get,
1549 	.set    = gfs2_xattr_system_set,
1550 };
1551 
1552 struct xattr_handler *gfs2_xattr_handlers[] = {
1553 	&gfs2_xattr_user_handler,
1554 	&gfs2_xattr_security_handler,
1555 	&gfs2_xattr_system_handler,
1556 	NULL,
1557 };
1558 
1559