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/fs/gfs2/xattr.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 1549 lines | 1149 code | 283 blank | 117 comment | 212 complexity | f13b951d54e82cb5e4803d6615965370 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/slab.h>
  11#include <linux/spinlock.h>
  12#include <linux/completion.h>
  13#include <linux/buffer_head.h>
  14#include <linux/xattr.h>
  15#include <linux/gfs2_ondisk.h>
  16#include <asm/uaccess.h>
  17
  18#include "gfs2.h"
  19#include "incore.h"
  20#include "acl.h"
  21#include "xattr.h"
  22#include "glock.h"
  23#include "inode.h"
  24#include "meta_io.h"
  25#include "quota.h"
  26#include "rgrp.h"
  27#include "trans.h"
  28#include "util.h"
  29
  30/**
  31 * ea_calc_size - returns the acutal number of bytes the request will take up
  32 *                (not counting any unstuffed data blocks)
  33 * @sdp:
  34 * @er:
  35 * @size:
  36 *
  37 * Returns: 1 if the EA should be stuffed
  38 */
  39
  40static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  41			unsigned int *size)
  42{
  43	unsigned int jbsize = sdp->sd_jbsize;
  44
  45	/* Stuffed */
  46	*size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  47
  48	if (*size <= jbsize)
  49		return 1;
  50
  51	/* Unstuffed */
  52	*size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  53		      (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  54
  55	return 0;
  56}
  57
  58static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  59{
  60	unsigned int size;
  61
  62	if (dsize > GFS2_EA_MAX_DATA_LEN)
  63		return -ERANGE;
  64
  65	ea_calc_size(sdp, nsize, dsize, &size);
  66
  67	/* This can only happen with 512 byte blocks */
  68	if (size > sdp->sd_jbsize)
  69		return -ERANGE;
  70
  71	return 0;
  72}
  73
  74typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  75			  struct gfs2_ea_header *ea,
  76			  struct gfs2_ea_header *prev, void *private);
  77
  78static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  79			ea_call_t ea_call, void *data)
  80{
  81	struct gfs2_ea_header *ea, *prev = NULL;
  82	int error = 0;
  83
  84	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  85		return -EIO;
  86
  87	for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  88		if (!GFS2_EA_REC_LEN(ea))
  89			goto fail;
  90		if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  91						  bh->b_data + bh->b_size))
  92			goto fail;
  93		if (!GFS2_EATYPE_VALID(ea->ea_type))
  94			goto fail;
  95
  96		error = ea_call(ip, bh, ea, prev, data);
  97		if (error)
  98			return error;
  99
 100		if (GFS2_EA_IS_LAST(ea)) {
 101			if ((char *)GFS2_EA2NEXT(ea) !=
 102			    bh->b_data + bh->b_size)
 103				goto fail;
 104			break;
 105		}
 106	}
 107
 108	return error;
 109
 110fail:
 111	gfs2_consist_inode(ip);
 112	return -EIO;
 113}
 114
 115static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 116{
 117	struct buffer_head *bh, *eabh;
 118	__be64 *eablk, *end;
 119	int error;
 120
 121	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &bh);
 122	if (error)
 123		return error;
 124
 125	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 126		error = ea_foreach_i(ip, bh, ea_call, data);
 127		goto out;
 128	}
 129
 130	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 131		error = -EIO;
 132		goto out;
 133	}
 134
 135	eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 136	end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 137
 138	for (; eablk < end; eablk++) {
 139		u64 bn;
 140
 141		if (!*eablk)
 142			break;
 143		bn = be64_to_cpu(*eablk);
 144
 145		error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, &eabh);
 146		if (error)
 147			break;
 148		error = ea_foreach_i(ip, eabh, ea_call, data);
 149		brelse(eabh);
 150		if (error)
 151			break;
 152	}
 153out:
 154	brelse(bh);
 155	return error;
 156}
 157
 158struct ea_find {
 159	int type;
 160	const char *name;
 161	size_t namel;
 162	struct gfs2_ea_location *ef_el;
 163};
 164
 165static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 166		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 167		     void *private)
 168{
 169	struct ea_find *ef = private;
 170
 171	if (ea->ea_type == GFS2_EATYPE_UNUSED)
 172		return 0;
 173
 174	if (ea->ea_type == ef->type) {
 175		if (ea->ea_name_len == ef->namel &&
 176		    !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 177			struct gfs2_ea_location *el = ef->ef_el;
 178			get_bh(bh);
 179			el->el_bh = bh;
 180			el->el_ea = ea;
 181			el->el_prev = prev;
 182			return 1;
 183		}
 184	}
 185
 186	return 0;
 187}
 188
 189static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 190			struct gfs2_ea_location *el)
 191{
 192	struct ea_find ef;
 193	int error;
 194
 195	ef.type = type;
 196	ef.name = name;
 197	ef.namel = strlen(name);
 198	ef.ef_el = el;
 199
 200	memset(el, 0, sizeof(struct gfs2_ea_location));
 201
 202	error = ea_foreach(ip, ea_find_i, &ef);
 203	if (error > 0)
 204		return 0;
 205
 206	return error;
 207}
 208
 209/**
 210 * ea_dealloc_unstuffed -
 211 * @ip:
 212 * @bh:
 213 * @ea:
 214 * @prev:
 215 * @private:
 216 *
 217 * Take advantage of the fact that all unstuffed blocks are
 218 * allocated from the same RG.  But watch, this may not always
 219 * be true.
 220 *
 221 * Returns: errno
 222 */
 223
 224static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 225				struct gfs2_ea_header *ea,
 226				struct gfs2_ea_header *prev, void *private)
 227{
 228	int *leave = private;
 229	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 230	struct gfs2_rgrpd *rgd;
 231	struct gfs2_holder rg_gh;
 232	struct buffer_head *dibh;
 233	__be64 *dataptrs;
 234	u64 bn = 0;
 235	u64 bstart = 0;
 236	unsigned int blen = 0;
 237	unsigned int blks = 0;
 238	unsigned int x;
 239	int error;
 240
 241	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
 315out_gunlock:
 316	gfs2_glock_dq_uninit(&rg_gh);
 317	return error;
 318}
 319
 320static 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
 343out_quota:
 344	gfs2_quota_unhold(ip);
 345out_alloc:
 346	gfs2_alloc_put(ip);
 347	return error;
 348}
 349
 350struct ea_list {
 351	struct gfs2_ea_request *ei_er;
 352	unsigned int ei_size;
 353};
 354
 355static 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
 369static 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
 425ssize_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
 465static 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
 514out:
 515	kfree(bh);
 516	return error;
 517}
 518
 519static 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
 537int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 538{
 539	struct gfs2_ea_location el;
 540	int error;
 541	int len;
 542	char *data;
 543
 544	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 545	if (error)
 546		return error;
 547	if (!el.el_ea)
 548		goto out;
 549	if (!GFS2_EA_DATA_LEN(el.el_ea))
 550		goto out;
 551
 552	len = GFS2_EA_DATA_LEN(el.el_ea);
 553	data = kmalloc(len, GFP_NOFS);
 554	error = -ENOMEM;
 555	if (data == NULL)
 556		goto out;
 557
 558	error = gfs2_ea_get_copy(ip, &el, data, len);
 559	if (error == 0)
 560		error = len;
 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 dentry *dentry, const char *name,
 578		void *buffer, size_t size, int type)
 579{
 580	struct gfs2_inode *ip = GFS2_I(dentry->d_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
 603/**
 604 * ea_alloc_blk - allocates a new block for extended attributes.
 605 * @ip: A pointer to the inode that's getting extended attributes
 606 * @bhp: Pointer to pointer to a struct buffer_head
 607 *
 608 * Returns: errno
 609 */
 610
 611static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 612{
 613	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 614	struct gfs2_ea_header *ea;
 615	unsigned int n = 1;
 616	u64 block;
 617	int error;
 618
 619	error = gfs2_alloc_block(ip, &block, &n);
 620	if (error)
 621		return error;
 622	gfs2_trans_add_unrevoke(sdp, block, 1);
 623	*bhp = gfs2_meta_new(ip->i_gl, block);
 624	gfs2_trans_add_bh(ip->i_gl, *bhp, 1);
 625	gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 626	gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 627
 628	ea = GFS2_EA_BH2FIRST(*bhp);
 629	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 630	ea->ea_type = GFS2_EATYPE_UNUSED;
 631	ea->ea_flags = GFS2_EAFLAG_LAST;
 632	ea->ea_num_ptrs = 0;
 633
 634	gfs2_add_inode_blocks(&ip->i_inode, 1);
 635
 636	return 0;
 637}
 638
 639/**
 640 * ea_write - writes the request info to an ea, creating new blocks if
 641 *            necessary
 642 * @ip: inode that is being modified
 643 * @ea: the location of the new ea in a block
 644 * @er: the write request
 645 *
 646 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 647 *
 648 * returns : errno
 649 */
 650
 651static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 652		    struct gfs2_ea_request *er)
 653{
 654	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 655	int error;
 656
 657	ea->ea_data_len = cpu_to_be32(er->er_data_len);
 658	ea->ea_name_len = er->er_name_len;
 659	ea->ea_type = er->er_type;
 660	ea->__pad = 0;
 661
 662	memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 663
 664	if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 665		ea->ea_num_ptrs = 0;
 666		memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 667	} else {
 668		__be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 669		const char *data = er->er_data;
 670		unsigned int data_len = er->er_data_len;
 671		unsigned int copy;
 672		unsigned int x;
 673
 674		ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 675		for (x = 0; x < ea->ea_num_ptrs; x++) {
 676			struct buffer_head *bh;
 677			u64 block;
 678			int mh_size = sizeof(struct gfs2_meta_header);
 679			unsigned int n = 1;
 680
 681			error = gfs2_alloc_block(ip, &block, &n);
 682			if (error)
 683				return error;
 684			gfs2_trans_add_unrevoke(sdp, block, 1);
 685			bh = gfs2_meta_new(ip->i_gl, block);
 686			gfs2_trans_add_bh(ip->i_gl, bh, 1);
 687			gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 688
 689			gfs2_add_inode_blocks(&ip->i_inode, 1);
 690
 691			copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 692							   data_len;
 693			memcpy(bh->b_data + mh_size, data, copy);
 694			if (copy < sdp->sd_jbsize)
 695				memset(bh->b_data + mh_size + copy, 0,
 696				       sdp->sd_jbsize - copy);
 697
 698			*dataptr++ = cpu_to_be64(bh->b_blocknr);
 699			data += copy;
 700			data_len -= copy;
 701
 702			brelse(bh);
 703		}
 704
 705		gfs2_assert_withdraw(sdp, !data_len);
 706	}
 707
 708	return 0;
 709}
 710
 711typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 712				   struct gfs2_ea_request *er, void *private);
 713
 714static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 715			     unsigned int blks,
 716			     ea_skeleton_call_t skeleton_call, void *private)
 717{
 718	struct gfs2_alloc *al;
 719	struct buffer_head *dibh;
 720	int error;
 721
 722	al = gfs2_alloc_get(ip);
 723	if (!al)
 724		return -ENOMEM;
 725
 726	error = gfs2_quota_lock_check(ip);
 727	if (error)
 728		goto out;
 729
 730	al->al_requested = blks;
 731
 732	error = gfs2_inplace_reserve(ip);
 733	if (error)
 734		goto out_gunlock_q;
 735
 736	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 737				 blks + gfs2_rg_blocks(al) +
 738				 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 739	if (error)
 740		goto out_ipres;
 741
 742	error = skeleton_call(ip, er, private);
 743	if (error)
 744		goto out_end_trans;
 745
 746	error = gfs2_meta_inode_buffer(ip, &dibh);
 747	if (!error) {
 748		ip->i_inode.i_ctime = CURRENT_TIME;
 749		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 750		gfs2_dinode_out(ip, dibh->b_data);
 751		brelse(dibh);
 752	}
 753
 754out_end_trans:
 755	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 756out_ipres:
 757	gfs2_inplace_release(ip);
 758out_gunlock_q:
 759	gfs2_quota_unlock(ip);
 760out:
 761	gfs2_alloc_put(ip);
 762	return error;
 763}
 764
 765static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 766		     void *private)
 767{
 768	struct buffer_head *bh;
 769	int error;
 770
 771	error = ea_alloc_blk(ip, &bh);
 772	if (error)
 773		return error;
 774
 775	ip->i_eattr = bh->b_blocknr;
 776	error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 777
 778	brelse(bh);
 779
 780	return error;
 781}
 782
 783/**
 784 * ea_init - initializes a new eattr block
 785 * @ip:
 786 * @er:
 787 *
 788 * Returns: errno
 789 */
 790
 791static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 792		   const void *data, size_t size)
 793{
 794	struct gfs2_ea_request er;
 795	unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 796	unsigned int blks = 1;
 797
 798	er.er_type = type;
 799	er.er_name = name;
 800	er.er_name_len = strlen(name);
 801	er.er_data = (void *)data;
 802	er.er_data_len = size;
 803
 804	if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 805		blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 806
 807	return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 808}
 809
 810static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 811{
 812	u32 ea_size = GFS2_EA_SIZE(ea);
 813	struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 814				     ea_size);
 815	u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 816	int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 817
 818	ea->ea_rec_len = cpu_to_be32(ea_size);
 819	ea->ea_flags ^= last;
 820
 821	new->ea_rec_len = cpu_to_be32(new_size);
 822	new->ea_flags = last;
 823
 824	return new;
 825}
 826
 827static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 828				  struct gfs2_ea_location *el)
 829{
 830	struct gfs2_ea_header *ea = el->el_ea;
 831	struct gfs2_ea_header *prev = el->el_prev;
 832	u32 len;
 833
 834	gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
 835
 836	if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 837		ea->ea_type = GFS2_EATYPE_UNUSED;
 838		return;
 839	} else if (GFS2_EA2NEXT(prev) != ea) {
 840		prev = GFS2_EA2NEXT(prev);
 841		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 842	}
 843
 844	len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 845	prev->ea_rec_len = cpu_to_be32(len);
 846
 847	if (GFS2_EA_IS_LAST(ea))
 848		prev->ea_flags |= GFS2_EAFLAG_LAST;
 849}
 850
 851struct ea_set {
 852	int ea_split;
 853
 854	struct gfs2_ea_request *es_er;
 855	struct gfs2_ea_location *es_el;
 856
 857	struct buffer_head *es_bh;
 858	struct gfs2_ea_header *es_ea;
 859};
 860
 861static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 862				 struct gfs2_ea_header *ea, struct ea_set *es)
 863{
 864	struct gfs2_ea_request *er = es->es_er;
 865	struct buffer_head *dibh;
 866	int error;
 867
 868	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 869	if (error)
 870		return error;
 871
 872	gfs2_trans_add_bh(ip->i_gl, bh, 1);
 873
 874	if (es->ea_split)
 875		ea = ea_split_ea(ea);
 876
 877	ea_write(ip, ea, er);
 878
 879	if (es->es_el)
 880		ea_set_remove_stuffed(ip, es->es_el);
 881
 882	error = gfs2_meta_inode_buffer(ip, &dibh);
 883	if (error)
 884		goto out;
 885	ip->i_inode.i_ctime = CURRENT_TIME;
 886	gfs2_trans_add_bh(ip->i_gl, dibh, 1);
 887	gfs2_dinode_out(ip, dibh->b_data);
 888	brelse(dibh);
 889out:
 890	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 891	return error;
 892}
 893
 894static int ea_set_simple_alloc(struct gfs2_inode *ip,
 895			       struct gfs2_ea_request *er, void *private)
 896{
 897	struct ea_set *es = private;
 898	struct gfs2_ea_header *ea = es->es_ea;
 899	int error;
 900
 901	gfs2_trans_add_bh(ip->i_gl, es->es_bh, 1);
 902
 903	if (es->ea_split)
 904		ea = ea_split_ea(ea);
 905
 906	error = ea_write(ip, ea, er);
 907	if (error)
 908		return error;
 909
 910	if (es->es_el)
 911		ea_set_remove_stuffed(ip, es->es_el);
 912
 913	return 0;
 914}
 915
 916static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 917			 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 918			 void *private)
 919{
 920	struct ea_set *es = private;
 921	unsigned int size;
 922	int stuffed;
 923	int error;
 924
 925	stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 926			       es->es_er->er_data_len, &size);
 927
 928	if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 929		if (GFS2_EA_REC_LEN(ea) < size)
 930			return 0;
 931		if (!GFS2_EA_IS_STUFFED(ea)) {
 932			error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 933			if (error)
 934				return error;
 935		}
 936		es->ea_split = 0;
 937	} else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 938		es->ea_split = 1;
 939	else
 940		return 0;
 941
 942	if (stuffed) {
 943		error = ea_set_simple_noalloc(ip, bh, ea, es);
 944		if (error)
 945			return error;
 946	} else {
 947		unsigned int blks;
 948
 949		es->es_bh = bh;
 950		es->es_ea = ea;
 951		blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 952					GFS2_SB(&ip->i_inode)->sd_jbsize);
 953
 954		error = ea_alloc_skeleton(ip, es->es_er, blks,
 955					  ea_set_simple_alloc, es);
 956		if (error)
 957			return error;
 958	}
 959
 960	return 1;
 961}
 962
 963static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 964			void *private)
 965{
 966	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 967	struct buffer_head *indbh, *newbh;
 968	__be64 *eablk;
 969	int error;
 970	int mh_size = sizeof(struct gfs2_meta_header);
 971
 972	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
 973		__be64 *end;
 974
 975		error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT,
 976				       &indbh);
 977		if (error)
 978			return error;
 979
 980		if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
 981			error = -EIO;
 982			goto out;
 983		}
 984
 985		eablk = (__be64 *)(indbh->b_data + mh_size);
 986		end = eablk + sdp->sd_inptrs;
 987
 988		for (; eablk < end; eablk++)
 989			if (!*eablk)
 990				break;
 991
 992		if (eablk == end) {
 993			error = -ENOSPC;
 994			goto out;
 995		}
 996
 997		gfs2_trans_add_bh(ip->i_gl, indbh, 1);
 998	} else {
 999		u64 blk;
1000		unsigned int n = 1;
1001		error = gfs2_alloc_block(ip, &blk, &n);
1002		if (error)
1003			return error;
1004		gfs2_trans_add_unrevoke(sdp, blk, 1);
1005		indbh = gfs2_meta_new(ip->i_gl, blk);
1006		gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1007		gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1008		gfs2_buffer_clear_tail(indbh, mh_size);
1009
1010		eablk = (__be64 *)(indbh->b_data + mh_size);
1011		*eablk = cpu_to_be64(ip->i_eattr);
1012		ip->i_eattr = blk;
1013		ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1014		gfs2_add_inode_blocks(&ip->i_inode, 1);
1015
1016		eablk++;
1017	}
1018
1019	error = ea_alloc_blk(ip, &newbh);
1020	if (error)
1021		goto out;
1022
1023	*eablk = cpu_to_be64((u64)newbh->b_blocknr);
1024	error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1025	brelse(newbh);
1026	if (error)
1027		goto out;
1028
1029	if (private)
1030		ea_set_remove_stuffed(ip, private);
1031
1032out:
1033	brelse(indbh);
1034	return error;
1035}
1036
1037static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1038		    const void *value, size_t size, struct gfs2_ea_location *el)
1039{
1040	struct gfs2_ea_request er;
1041	struct ea_set es;
1042	unsigned int blks = 2;
1043	int error;
1044
1045	er.er_type = type;
1046	er.er_name = name;
1047	er.er_data = (void *)value;
1048	er.er_name_len = strlen(name);
1049	er.er_data_len = size;
1050
1051	memset(&es, 0, sizeof(struct ea_set));
1052	es.es_er = &er;
1053	es.es_el = el;
1054
1055	error = ea_foreach(ip, ea_set_simple, &es);
1056	if (error > 0)
1057		return 0;
1058	if (error)
1059		return error;
1060
1061	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1062		blks++;
1063	if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1064		blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1065
1066	return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1067}
1068
1069static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1070				   struct gfs2_ea_location *el)
1071{
1072	if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1073		el->el_prev = GFS2_EA2NEXT(el->el_prev);
1074		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1075				     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1076	}
1077
1078	return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1079}
1080
1081static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1082{
1083	struct gfs2_ea_header *ea = el->el_ea;
1084	struct gfs2_ea_header *prev = el->el_prev;
1085	struct buffer_head *dibh;
1086	int error;
1087
1088	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1089	if (error)
1090		return error;
1091
1092	gfs2_trans_add_bh(ip->i_gl, el->el_bh, 1);
1093
1094	if (prev) {
1095		u32 len;
1096
1097		len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1098		prev->ea_rec_len = cpu_to_be32(len);
1099
1100		if (GFS2_EA_IS_LAST(ea))
1101			prev->ea_flags |= GFS2_EAFLAG_LAST;
1102	} else {
1103		ea->ea_type = GFS2_EATYPE_UNUSED;
1104	}
1105
1106	error = gfs2_meta_inode_buffer(ip, &dibh);
1107	if (!error) {
1108		ip->i_inode.i_ctime = CURRENT_TIME;
1109		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1110		gfs2_dinode_out(ip, dibh->b_data);
1111		brelse(dibh);
1112	}
1113
1114	gfs2_trans_end(GFS2_SB(&ip->i_inode));
1115
1116	return error;
1117}
1118
1119/**
1120 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1121 * @ip: The inode
1122 * @type: The type of the extended attribute
1123 * @name: The name of the extended attribute
1124 *
1125 * This is not called directly by the VFS since we use the (common)
1126 * scheme of making a "set with NULL data" mean a remove request. Note
1127 * that this is different from a set with zero length data.
1128 *
1129 * Returns: 0, or errno on failure
1130 */
1131
1132static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1133{
1134	struct gfs2_ea_location el;
1135	int error;
1136
1137	if (!ip->i_eattr)
1138		return -ENODATA;
1139
1140	error = gfs2_ea_find(ip, type, name, &el);
1141	if (error)
1142		return error;
1143	if (!el.el_ea)
1144		return -ENODATA;
1145
1146	if (GFS2_EA_IS_STUFFED(el.el_ea))
1147		error = ea_remove_stuffed(ip, &el);
1148	else
1149		error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1150
1151	brelse(el.el_bh);
1152
1153	return error;
1154}
1155
1156/**
1157 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1158 * @ip: The inode
1159 * @name: The name of the extended attribute
1160 * @value: The value of the extended attribute (NULL for remove)
1161 * @size: The size of the @value argument
1162 * @flags: Create or Replace
1163 * @type: The type of the extended attribute
1164 *
1165 * See gfs2_xattr_remove() for details of the removal of xattrs.
1166 *
1167 * Returns: 0 or errno on failure
1168 */
1169
1170int __gfs2_xattr_set(struct inode *inode, const char *name,
1171		   const void *value, size_t size, int flags, int type)
1172{
1173	struct gfs2_inode *ip = GFS2_I(inode);
1174	struct gfs2_sbd *sdp = GFS2_SB(inode);
1175	struct gfs2_ea_location el;
1176	unsigned int namel = strlen(name);
1177	int error;
1178
1179	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1180		return -EPERM;
1181	if (namel > GFS2_EA_MAX_NAME_LEN)
1182		return -ERANGE;
1183
1184	if (value == NULL)
1185		return gfs2_xattr_remove(ip, type, name);
1186
1187	if (ea_check_size(sdp, namel, size))
1188		return -ERANGE;
1189
1190	if (!ip->i_eattr) {
1191		if (flags & XATTR_REPLACE)
1192			return -ENODATA;
1193		return ea_init(ip, type, name, value, size);
1194	}
1195
1196	error = gfs2_ea_find(ip, type, name, &el);
1197	if (error)
1198		return error;
1199
1200	if (el.el_ea) {
1201		if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1202			brelse(el.el_bh);
1203			return -EPERM;
1204		}
1205
1206		error = -EEXIST;
1207		if (!(flags & XATTR_CREATE)) {
1208			int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1209			error = ea_set_i(ip, type, name, value, size, &el);
1210			if (!error && unstuffed)
1211				ea_set_remove_unstuffed(ip, &el);
1212		}
1213
1214		brelse(el.el_bh);
1215		return error;
1216	}
1217
1218	error = -ENODATA;
1219	if (!(flags & XATTR_REPLACE))
1220		error = ea_set_i(ip, type, name, value, size, NULL);
1221
1222	return error;
1223}
1224
1225static int gfs2_xattr_set(struct dentry *dentry, const char *name,
1226		const void *value, size_t size, int flags, int type)
1227{
1228	return __gfs2_xattr_set(dentry->d_inode, name, value,
1229				size, flags, type);
1230}
1231
1232static int ea_acl_chmod_unstuffed(struct gfs2_inode *ip,
1233				  struct gfs2_ea_header *ea, char *data)
1234{
1235	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1236	struct buffer_head **bh;
1237	unsigned int amount = GFS2_EA_DATA_LEN(ea);
1238	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
1239	__be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
1240	unsigned int x;
1241	int error;
1242
1243	bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
1244	if (!bh)
1245		return -ENOMEM;
1246
1247	error = gfs2_trans_begin(sdp, nptrs + RES_DINODE, 0);
1248	if (error)
1249		goto out;
1250
1251	for (x = 0; x < nptrs; x++) {
1252		error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0,
1253				       bh + x);
1254		if (error) {
1255			while (x--)
1256				brelse(bh[x]);
1257			goto fail;
1258		}
1259		dataptrs++;
1260	}
1261
1262	for (x = 0; x < nptrs; x++) {
1263		error = gfs2_meta_wait(sdp, bh[x]);
1264		if (error) {
1265			for (; x < nptrs; x++)
1266				brelse(bh[x]);
1267			goto fail;
1268		}
1269		if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
1270			for (; x < nptrs; x++)
1271				brelse(bh[x]);
1272			error = -EIO;
1273			goto fail;
1274		}
1275
1276		gfs2_trans_add_bh(ip->i_gl, bh[x], 1);
1277
1278		memcpy(bh[x]->b_data + sizeof(struct gfs2_meta_header), data,
1279		       (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize);
1280
1281		amount -= sdp->sd_jbsize;
1282		data += sdp->sd_jbsize;
1283
1284		brelse(bh[x]);
1285	}
1286
1287out:
1288	kfree(bh);
1289	return error;
1290
1291fail:
1292	gfs2_trans_end(sdp);
1293	kfree(bh);
1294	return error;
1295}
1296
1297int gfs2_xattr_acl_chmod(struct gfs2_inode *ip, struct iattr *attr, char *data)
1298{
1299	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1300	struct gfs2_ea_location el;
1301	int error;
1302
1303	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, GFS2_POSIX_ACL_ACCESS, &el);
1304	if (error)
1305		return error;
1306
1307	if (GFS2_EA_IS_STUFFED(el.el_ea)) {
1308		error = gfs2_trans_begin(sdp, RES_DINODE + RES_EATTR, 0);
1309		if (error == 0) {
1310			gfs2_trans_add_bh(ip->i_gl, el.el_bh, 1);
1311			memcpy(GFS2_EA2DATA(el.el_ea), data,
1312			       GFS2_EA_DATA_LEN(el.el_ea));
1313		}
1314	} else {
1315		error = ea_acl_chmod_unstuffed(ip, el.el_ea, data);
1316	}
1317
1318	brelse(el.el_bh);
1319	if (error)
1320		return error;
1321
1322	error = gfs2_setattr_simple(ip, attr);
1323	gfs2_trans_end(sdp);
1324	return error;
1325}
1326
1327static int ea_dealloc_indirect(struct gfs2_inode *ip)
1328{
1329	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1330	struct gfs2_rgrp_list rlist;
1331	struct buffer_head *indbh, *dibh;
1332	__be64 *eablk, *end;
1333	unsigned int rg_blocks = 0;
1334	u64 bstart = 0;
1335	unsigned int blen = 0;
1336	unsigned int blks = 0;
1337	unsigned int x;
1338	int error;
1339
1340	memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1341
1342	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, &indbh);
1343	if (error)
1344		return error;
1345
1346	if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1347		error = -EIO;
1348		goto out;
1349	}
1350
1351	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1352	end = eablk + sdp->sd_inptrs;
1353
1354	for (; eablk < end; eablk++) {
1355		u64 bn;
1356
1357		if (!*eablk)
1358			break;
1359		bn = be64_to_cpu(*eablk);
1360
1361		if (bstart + blen == bn)
1362			blen++;
1363		else {
1364			if (bstart)
1365				gfs2_rlist_add(sdp, &rlist, bstart);
1366			bstart = bn;
1367			blen = 1;
1368		}
1369		blks++;
1370	}
1371	if (bstart)
1372		gfs2_rlist_add(sdp, &rlist, bstart);
1373	else
1374		goto out;
1375
1376	gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1377
1378	for (x = 0; x < rlist.rl_rgrps; x++) {
1379		struct gfs2_rgrpd *rgd;
1380		rgd = rlist.rl_ghs[x].gh_gl->gl_object;
1381		rg_blocks += rgd->rd_length;
1382	}
1383
1384	error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385	if (error)
1386		goto out_rlist_free;
1387
1388	error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1389				 RES_STATFS + RES_QUOTA, blks);
1390	if (error)
1391		goto out_gunlock;
1392
1393	gfs2_trans_add_bh(ip->i_gl, indbh, 1);
1394
1395	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1396	bstart = 0;
1397	blen = 0;
1398
1399	for (; eablk < end; eablk++) {
1400		u64 bn;
1401
1402		if (!*eablk)
1403			break;
1404		bn = be64_to_cpu(*eablk);
1405
1406		if (bstart + blen == bn)
1407			blen++;
1408		else {
1409			if (bstart)
1410				gfs2_free_meta(ip, bstart, blen);
1411			bstart = bn;
1412			blen = 1;
1413		}
1414
1415		*eablk = 0;
1416		gfs2_add_inode_blocks(&ip->i_inode, -1);
1417	}
1418	if (bstart)
1419		gfs2_free_meta(ip, bstart, blen);
1420
1421	ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1422
1423	error = gfs2_meta_inode_buffer(ip, &dibh);
1424	if (!error) {
1425		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1426		gfs2_dinode_out(ip, dibh->b_data);
1427		brelse(dibh);
1428	}
1429
1430	gfs2_trans_end(sdp);
1431
1432out_gunlock:
1433	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1434out_rlist_free:
1435	gfs2_rlist_free(&rlist);
1436out:
1437	brelse(indbh);
1438	return error;
1439}
1440
1441static int ea_dealloc_block(struct gfs2_inode *ip)
1442{
1443	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1444	struct gfs2_alloc *al = ip->i_alloc;
1445	struct gfs2_rgrpd *rgd;
1446	struct buffer_head *dibh;
1447	int error;
1448
1449	rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr);
1450	if (!rgd) {
1451		gfs2_consist_inode(ip);
1452		return -EIO;
1453	}
1454
1455	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0,
1456				   &al->al_rgd_gh);
1457	if (error)
1458		return error;
1459
1460	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1461				 RES_QUOTA, 1);
1462	if (error)
1463		goto out_gunlock;
1464
1465	gfs2_free_meta(ip, ip->i_eattr, 1);
1466
1467	ip->i_eattr = 0;
1468	gfs2_add_inode_blocks(&ip->i_inode, -1);
1469
1470	error = gfs2_meta_inode_buffer(ip, &dibh);
1471	if (!error) {
1472		gfs2_trans_add_bh(ip->i_gl, dibh, 1);
1473		gfs2_dinode_out(ip, dibh->b_data);
1474		brelse(dibh);
1475	}
1476
1477	gfs2_trans_end(sdp);
1478
1479out_gunlock:
1480	gfs2_glock_dq_uninit(&al->al_rgd_gh);
1481	return error;
1482}
1483
1484/**
1485 * gfs2_ea_dealloc - deallocate the extended attribute fork
1486 * @ip: the inode
1487 *
1488 * Returns: errno
1489 */
1490
1491int gfs2_ea_dealloc(struct gfs2_inode *ip)
1492{
1493	struct gfs2_alloc *al;
1494	int error;
1495
1496	al = gfs2_alloc_get(ip);
1497	if (!al)
1498		return -ENOMEM;
1499
1500	error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE);
1501	if (error)
1502		goto out_alloc;
1503
1504	error = gfs2_rindex_hold(GFS2_SB(&ip->i_inode), &al->al_ri_gh);
1505	if (error)
1506		goto out_quota;
1507
1508	error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1509	if (error)
1510		goto out_rindex;
1511
1512	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1513		error = ea_dealloc_indirect(ip);
1514		if (error)
1515			goto out_rindex;
1516	}
1517
1518	error = ea_dealloc_block(ip);
1519
1520out_rindex:
1521	gfs2_glock_dq_uninit(&al->al_ri_gh);
1522out_quota:
1523	gfs2_quota_unhold(ip);
1524out_alloc:
1525	gfs2_alloc_put(ip);
1526	return error;
1527}
1528
1529static const struct xattr_handler gfs2_xattr_user_handler = {
1530	.prefix = XATTR_USER_PREFIX,
1531	.flags  = GFS2_EATYPE_USR,
1532	.get    = gfs2_xattr_get,
1533	.set    = gfs2_xattr_set,
1534};
1535
1536static const struct xattr_handler gfs2_xattr_security_handler = {
1537	.prefix = XATTR_SECURITY_PREFIX,
1538	.flags  = GFS2_EATYPE_SECURITY,
1539	.get    = gfs2_xattr_get,
1540	.set    = gfs2_xattr_set,
1541};
1542
1543const struct xattr_handler *gfs2_xattr_handlers[] = {
1544	&gfs2_xattr_user_handler,
1545	&gfs2_xattr_security_handler,
1546	&gfs2_xattr_system_handler,
1547	NULL,
1548};
1549