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/fs/gfs2/xattr.c

https://bitbucket.org/emiliolopez/linux
C | 1495 lines | 1103 code | 273 blank | 119 comment | 203 complexity | 289508367afc2e71b3322a3daf4a08a0 MD5 | raw file
   1/*
   2 * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3 * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
   4 *
   5 * This copyrighted material is made available to anyone wishing to use,
   6 * modify, copy, or redistribute it subject to the terms and conditions
   7 * of the GNU General Public License version 2.
   8 */
   9
  10#include <linux/slab.h>
  11#include <linux/spinlock.h>
  12#include <linux/completion.h>
  13#include <linux/buffer_head.h>
  14#include <linux/xattr.h>
  15#include <linux/gfs2_ondisk.h>
  16#include <linux/posix_acl_xattr.h>
  17#include <linux/uaccess.h>
  18
  19#include "gfs2.h"
  20#include "incore.h"
  21#include "acl.h"
  22#include "xattr.h"
  23#include "glock.h"
  24#include "inode.h"
  25#include "meta_io.h"
  26#include "quota.h"
  27#include "rgrp.h"
  28#include "trans.h"
  29#include "util.h"
  30
  31/**
  32 * ea_calc_size - returns the acutal number of bytes the request will take up
  33 *                (not counting any unstuffed data blocks)
  34 * @sdp:
  35 * @er:
  36 * @size:
  37 *
  38 * Returns: 1 if the EA should be stuffed
  39 */
  40
  41static int ea_calc_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize,
  42			unsigned int *size)
  43{
  44	unsigned int jbsize = sdp->sd_jbsize;
  45
  46	/* Stuffed */
  47	*size = ALIGN(sizeof(struct gfs2_ea_header) + nsize + dsize, 8);
  48
  49	if (*size <= jbsize)
  50		return 1;
  51
  52	/* Unstuffed */
  53	*size = ALIGN(sizeof(struct gfs2_ea_header) + nsize +
  54		      (sizeof(__be64) * DIV_ROUND_UP(dsize, jbsize)), 8);
  55
  56	return 0;
  57}
  58
  59static int ea_check_size(struct gfs2_sbd *sdp, unsigned int nsize, size_t dsize)
  60{
  61	unsigned int size;
  62
  63	if (dsize > GFS2_EA_MAX_DATA_LEN)
  64		return -ERANGE;
  65
  66	ea_calc_size(sdp, nsize, dsize, &size);
  67
  68	/* This can only happen with 512 byte blocks */
  69	if (size > sdp->sd_jbsize)
  70		return -ERANGE;
  71
  72	return 0;
  73}
  74
  75typedef int (*ea_call_t) (struct gfs2_inode *ip, struct buffer_head *bh,
  76			  struct gfs2_ea_header *ea,
  77			  struct gfs2_ea_header *prev, void *private);
  78
  79static int ea_foreach_i(struct gfs2_inode *ip, struct buffer_head *bh,
  80			ea_call_t ea_call, void *data)
  81{
  82	struct gfs2_ea_header *ea, *prev = NULL;
  83	int error = 0;
  84
  85	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_EA))
  86		return -EIO;
  87
  88	for (ea = GFS2_EA_BH2FIRST(bh);; prev = ea, ea = GFS2_EA2NEXT(ea)) {
  89		if (!GFS2_EA_REC_LEN(ea))
  90			goto fail;
  91		if (!(bh->b_data <= (char *)ea && (char *)GFS2_EA2NEXT(ea) <=
  92						  bh->b_data + bh->b_size))
  93			goto fail;
  94		if (!GFS2_EATYPE_VALID(ea->ea_type))
  95			goto fail;
  96
  97		error = ea_call(ip, bh, ea, prev, data);
  98		if (error)
  99			return error;
 100
 101		if (GFS2_EA_IS_LAST(ea)) {
 102			if ((char *)GFS2_EA2NEXT(ea) !=
 103			    bh->b_data + bh->b_size)
 104				goto fail;
 105			break;
 106		}
 107	}
 108
 109	return error;
 110
 111fail:
 112	gfs2_consist_inode(ip);
 113	return -EIO;
 114}
 115
 116static int ea_foreach(struct gfs2_inode *ip, ea_call_t ea_call, void *data)
 117{
 118	struct buffer_head *bh, *eabh;
 119	__be64 *eablk, *end;
 120	int error;
 121
 122	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &bh);
 123	if (error)
 124		return error;
 125
 126	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT)) {
 127		error = ea_foreach_i(ip, bh, ea_call, data);
 128		goto out;
 129	}
 130
 131	if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), bh, GFS2_METATYPE_IN)) {
 132		error = -EIO;
 133		goto out;
 134	}
 135
 136	eablk = (__be64 *)(bh->b_data + sizeof(struct gfs2_meta_header));
 137	end = eablk + GFS2_SB(&ip->i_inode)->sd_inptrs;
 138
 139	for (; eablk < end; eablk++) {
 140		u64 bn;
 141
 142		if (!*eablk)
 143			break;
 144		bn = be64_to_cpu(*eablk);
 145
 146		error = gfs2_meta_read(ip->i_gl, bn, DIO_WAIT, 0, &eabh);
 147		if (error)
 148			break;
 149		error = ea_foreach_i(ip, eabh, ea_call, data);
 150		brelse(eabh);
 151		if (error)
 152			break;
 153	}
 154out:
 155	brelse(bh);
 156	return error;
 157}
 158
 159struct ea_find {
 160	int type;
 161	const char *name;
 162	size_t namel;
 163	struct gfs2_ea_location *ef_el;
 164};
 165
 166static int ea_find_i(struct gfs2_inode *ip, struct buffer_head *bh,
 167		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 168		     void *private)
 169{
 170	struct ea_find *ef = private;
 171
 172	if (ea->ea_type == GFS2_EATYPE_UNUSED)
 173		return 0;
 174
 175	if (ea->ea_type == ef->type) {
 176		if (ea->ea_name_len == ef->namel &&
 177		    !memcmp(GFS2_EA2NAME(ea), ef->name, ea->ea_name_len)) {
 178			struct gfs2_ea_location *el = ef->ef_el;
 179			get_bh(bh);
 180			el->el_bh = bh;
 181			el->el_ea = ea;
 182			el->el_prev = prev;
 183			return 1;
 184		}
 185	}
 186
 187	return 0;
 188}
 189
 190static int gfs2_ea_find(struct gfs2_inode *ip, int type, const char *name,
 191			struct gfs2_ea_location *el)
 192{
 193	struct ea_find ef;
 194	int error;
 195
 196	ef.type = type;
 197	ef.name = name;
 198	ef.namel = strlen(name);
 199	ef.ef_el = el;
 200
 201	memset(el, 0, sizeof(struct gfs2_ea_location));
 202
 203	error = ea_foreach(ip, ea_find_i, &ef);
 204	if (error > 0)
 205		return 0;
 206
 207	return error;
 208}
 209
 210/**
 211 * ea_dealloc_unstuffed -
 212 * @ip:
 213 * @bh:
 214 * @ea:
 215 * @prev:
 216 * @private:
 217 *
 218 * Take advantage of the fact that all unstuffed blocks are
 219 * allocated from the same RG.  But watch, this may not always
 220 * be true.
 221 *
 222 * Returns: errno
 223 */
 224
 225static int ea_dealloc_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 226				struct gfs2_ea_header *ea,
 227				struct gfs2_ea_header *prev, void *private)
 228{
 229	int *leave = private;
 230	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 231	struct gfs2_rgrpd *rgd;
 232	struct gfs2_holder rg_gh;
 233	struct buffer_head *dibh;
 234	__be64 *dataptrs;
 235	u64 bn = 0;
 236	u64 bstart = 0;
 237	unsigned int blen = 0;
 238	unsigned int blks = 0;
 239	unsigned int x;
 240	int error;
 241
 242	error = gfs2_rindex_update(sdp);
 243	if (error)
 244		return error;
 245
 246	if (GFS2_EA_IS_STUFFED(ea))
 247		return 0;
 248
 249	dataptrs = GFS2_EA2DATAPTRS(ea);
 250	for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 251		if (*dataptrs) {
 252			blks++;
 253			bn = be64_to_cpu(*dataptrs);
 254		}
 255	}
 256	if (!blks)
 257		return 0;
 258
 259	rgd = gfs2_blk2rgrpd(sdp, bn, 1);
 260	if (!rgd) {
 261		gfs2_consist_inode(ip);
 262		return -EIO;
 263	}
 264
 265	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &rg_gh);
 266	if (error)
 267		return error;
 268
 269	error = gfs2_trans_begin(sdp, rgd->rd_length + RES_DINODE +
 270				 RES_EATTR + RES_STATFS + RES_QUOTA, blks);
 271	if (error)
 272		goto out_gunlock;
 273
 274	gfs2_trans_add_meta(ip->i_gl, bh);
 275
 276	dataptrs = GFS2_EA2DATAPTRS(ea);
 277	for (x = 0; x < ea->ea_num_ptrs; x++, dataptrs++) {
 278		if (!*dataptrs)
 279			break;
 280		bn = be64_to_cpu(*dataptrs);
 281
 282		if (bstart + blen == bn)
 283			blen++;
 284		else {
 285			if (bstart)
 286				gfs2_free_meta(ip, bstart, blen);
 287			bstart = bn;
 288			blen = 1;
 289		}
 290
 291		*dataptrs = 0;
 292		gfs2_add_inode_blocks(&ip->i_inode, -1);
 293	}
 294	if (bstart)
 295		gfs2_free_meta(ip, bstart, blen);
 296
 297	if (prev && !leave) {
 298		u32 len;
 299
 300		len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 301		prev->ea_rec_len = cpu_to_be32(len);
 302
 303		if (GFS2_EA_IS_LAST(ea))
 304			prev->ea_flags |= GFS2_EAFLAG_LAST;
 305	} else {
 306		ea->ea_type = GFS2_EATYPE_UNUSED;
 307		ea->ea_num_ptrs = 0;
 308	}
 309
 310	error = gfs2_meta_inode_buffer(ip, &dibh);
 311	if (!error) {
 312		ip->i_inode.i_ctime = current_time(&ip->i_inode);
 313		gfs2_trans_add_meta(ip->i_gl, dibh);
 314		gfs2_dinode_out(ip, dibh->b_data);
 315		brelse(dibh);
 316	}
 317
 318	gfs2_trans_end(sdp);
 319
 320out_gunlock:
 321	gfs2_glock_dq_uninit(&rg_gh);
 322	return error;
 323}
 324
 325static int ea_remove_unstuffed(struct gfs2_inode *ip, struct buffer_head *bh,
 326			       struct gfs2_ea_header *ea,
 327			       struct gfs2_ea_header *prev, int leave)
 328{
 329	int error;
 330
 331	error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 332	if (error)
 333		return error;
 334
 335	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
 336	if (error)
 337		goto out_alloc;
 338
 339	error = ea_dealloc_unstuffed(ip, bh, ea, prev, (leave) ? &error : NULL);
 340
 341	gfs2_quota_unhold(ip);
 342out_alloc:
 343	return error;
 344}
 345
 346struct ea_list {
 347	struct gfs2_ea_request *ei_er;
 348	unsigned int ei_size;
 349};
 350
 351static inline unsigned int gfs2_ea_strlen(struct gfs2_ea_header *ea)
 352{
 353	switch (ea->ea_type) {
 354	case GFS2_EATYPE_USR:
 355		return 5 + ea->ea_name_len + 1;
 356	case GFS2_EATYPE_SYS:
 357		return 7 + ea->ea_name_len + 1;
 358	case GFS2_EATYPE_SECURITY:
 359		return 9 + ea->ea_name_len + 1;
 360	default:
 361		return 0;
 362	}
 363}
 364
 365static int ea_list_i(struct gfs2_inode *ip, struct buffer_head *bh,
 366		     struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 367		     void *private)
 368{
 369	struct ea_list *ei = private;
 370	struct gfs2_ea_request *er = ei->ei_er;
 371	unsigned int ea_size = gfs2_ea_strlen(ea);
 372
 373	if (ea->ea_type == GFS2_EATYPE_UNUSED)
 374		return 0;
 375
 376	if (er->er_data_len) {
 377		char *prefix = NULL;
 378		unsigned int l = 0;
 379		char c = 0;
 380
 381		if (ei->ei_size + ea_size > er->er_data_len)
 382			return -ERANGE;
 383
 384		switch (ea->ea_type) {
 385		case GFS2_EATYPE_USR:
 386			prefix = "user.";
 387			l = 5;
 388			break;
 389		case GFS2_EATYPE_SYS:
 390			prefix = "system.";
 391			l = 7;
 392			break;
 393		case GFS2_EATYPE_SECURITY:
 394			prefix = "security.";
 395			l = 9;
 396			break;
 397		}
 398
 399		BUG_ON(l == 0);
 400
 401		memcpy(er->er_data + ei->ei_size, prefix, l);
 402		memcpy(er->er_data + ei->ei_size + l, GFS2_EA2NAME(ea),
 403		       ea->ea_name_len);
 404		memcpy(er->er_data + ei->ei_size + ea_size - 1, &c, 1);
 405	}
 406
 407	ei->ei_size += ea_size;
 408
 409	return 0;
 410}
 411
 412/**
 413 * gfs2_listxattr - List gfs2 extended attributes
 414 * @dentry: The dentry whose inode we are interested in
 415 * @buffer: The buffer to write the results
 416 * @size: The size of the buffer
 417 *
 418 * Returns: actual size of data on success, -errno on error
 419 */
 420
 421ssize_t gfs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
 422{
 423	struct gfs2_inode *ip = GFS2_I(d_inode(dentry));
 424	struct gfs2_ea_request er;
 425	struct gfs2_holder i_gh;
 426	int error;
 427
 428	memset(&er, 0, sizeof(struct gfs2_ea_request));
 429	if (size) {
 430		er.er_data = buffer;
 431		er.er_data_len = size;
 432	}
 433
 434	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
 435	if (error)
 436		return error;
 437
 438	if (ip->i_eattr) {
 439		struct ea_list ei = { .ei_er = &er, .ei_size = 0 };
 440
 441		error = ea_foreach(ip, ea_list_i, &ei);
 442		if (!error)
 443			error = ei.ei_size;
 444	}
 445
 446	gfs2_glock_dq_uninit(&i_gh);
 447
 448	return error;
 449}
 450
 451/**
 452 * ea_iter_unstuffed - copies the unstuffed xattr data to/from the
 453 *                     request buffer
 454 * @ip: The GFS2 inode
 455 * @ea: The extended attribute header structure
 456 * @din: The data to be copied in
 457 * @dout: The data to be copied out (one of din,dout will be NULL)
 458 *
 459 * Returns: errno
 460 */
 461
 462static int gfs2_iter_unstuffed(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 463			       const char *din, char *dout)
 464{
 465	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 466	struct buffer_head **bh;
 467	unsigned int amount = GFS2_EA_DATA_LEN(ea);
 468	unsigned int nptrs = DIV_ROUND_UP(amount, sdp->sd_jbsize);
 469	__be64 *dataptrs = GFS2_EA2DATAPTRS(ea);
 470	unsigned int x;
 471	int error = 0;
 472	unsigned char *pos;
 473	unsigned cp_size;
 474
 475	bh = kcalloc(nptrs, sizeof(struct buffer_head *), GFP_NOFS);
 476	if (!bh)
 477		return -ENOMEM;
 478
 479	for (x = 0; x < nptrs; x++) {
 480		error = gfs2_meta_read(ip->i_gl, be64_to_cpu(*dataptrs), 0, 0,
 481				       bh + x);
 482		if (error) {
 483			while (x--)
 484				brelse(bh[x]);
 485			goto out;
 486		}
 487		dataptrs++;
 488	}
 489
 490	for (x = 0; x < nptrs; x++) {
 491		error = gfs2_meta_wait(sdp, bh[x]);
 492		if (error) {
 493			for (; x < nptrs; x++)
 494				brelse(bh[x]);
 495			goto out;
 496		}
 497		if (gfs2_metatype_check(sdp, bh[x], GFS2_METATYPE_ED)) {
 498			for (; x < nptrs; x++)
 499				brelse(bh[x]);
 500			error = -EIO;
 501			goto out;
 502		}
 503
 504		pos = bh[x]->b_data + sizeof(struct gfs2_meta_header);
 505		cp_size = (sdp->sd_jbsize > amount) ? amount : sdp->sd_jbsize;
 506
 507		if (dout) {
 508			memcpy(dout, pos, cp_size);
 509			dout += sdp->sd_jbsize;
 510		}
 511
 512		if (din) {
 513			gfs2_trans_add_meta(ip->i_gl, bh[x]);
 514			memcpy(pos, din, cp_size);
 515			din += sdp->sd_jbsize;
 516		}
 517
 518		amount -= sdp->sd_jbsize;
 519		brelse(bh[x]);
 520	}
 521
 522out:
 523	kfree(bh);
 524	return error;
 525}
 526
 527static int gfs2_ea_get_copy(struct gfs2_inode *ip, struct gfs2_ea_location *el,
 528			    char *data, size_t size)
 529{
 530	int ret;
 531	size_t len = GFS2_EA_DATA_LEN(el->el_ea);
 532	if (len > size)
 533		return -ERANGE;
 534
 535	if (GFS2_EA_IS_STUFFED(el->el_ea)) {
 536		memcpy(data, GFS2_EA2DATA(el->el_ea), len);
 537		return len;
 538	}
 539	ret = gfs2_iter_unstuffed(ip, el->el_ea, NULL, data);
 540	if (ret < 0)
 541		return ret;
 542	return len;
 543}
 544
 545int gfs2_xattr_acl_get(struct gfs2_inode *ip, const char *name, char **ppdata)
 546{
 547	struct gfs2_ea_location el;
 548	int error;
 549	int len;
 550	char *data;
 551
 552	error = gfs2_ea_find(ip, GFS2_EATYPE_SYS, name, &el);
 553	if (error)
 554		return error;
 555	if (!el.el_ea)
 556		goto out;
 557	if (!GFS2_EA_DATA_LEN(el.el_ea))
 558		goto out;
 559
 560	len = GFS2_EA_DATA_LEN(el.el_ea);
 561	data = kmalloc(len, GFP_NOFS);
 562	error = -ENOMEM;
 563	if (data == NULL)
 564		goto out;
 565
 566	error = gfs2_ea_get_copy(ip, &el, data, len);
 567	if (error < 0)
 568		kfree(data);
 569	else
 570		*ppdata = data;
 571out:
 572	brelse(el.el_bh);
 573	return error;
 574}
 575
 576/**
 577 * gfs2_xattr_get - Get a GFS2 extended attribute
 578 * @inode: The inode
 579 * @name: The name of the extended attribute
 580 * @buffer: The buffer to write the result into
 581 * @size: The size of the buffer
 582 * @type: The type of extended attribute
 583 *
 584 * Returns: actual size of data on success, -errno on error
 585 */
 586static int __gfs2_xattr_get(struct inode *inode, const char *name,
 587			    void *buffer, size_t size, int type)
 588{
 589	struct gfs2_inode *ip = GFS2_I(inode);
 590	struct gfs2_ea_location el;
 591	int error;
 592
 593	if (!ip->i_eattr)
 594		return -ENODATA;
 595	if (strlen(name) > GFS2_EA_MAX_NAME_LEN)
 596		return -EINVAL;
 597
 598	error = gfs2_ea_find(ip, type, name, &el);
 599	if (error)
 600		return error;
 601	if (!el.el_ea)
 602		return -ENODATA;
 603	if (size)
 604		error = gfs2_ea_get_copy(ip, &el, buffer, size);
 605	else
 606		error = GFS2_EA_DATA_LEN(el.el_ea);
 607	brelse(el.el_bh);
 608
 609	return error;
 610}
 611
 612static int gfs2_xattr_get(const struct xattr_handler *handler,
 613			  struct dentry *unused, struct inode *inode,
 614			  const char *name, void *buffer, size_t size)
 615{
 616	struct gfs2_inode *ip = GFS2_I(inode);
 617	struct gfs2_holder gh;
 618	bool need_unlock = false;
 619	int ret;
 620
 621	/* During lookup, SELinux calls this function with the glock locked. */
 622
 623	if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
 624		ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &gh);
 625		if (ret)
 626			return ret;
 627		need_unlock = true;
 628	}
 629	ret = __gfs2_xattr_get(inode, name, buffer, size, handler->flags);
 630	if (need_unlock)
 631		gfs2_glock_dq_uninit(&gh);
 632	return ret;
 633}
 634
 635/**
 636 * ea_alloc_blk - allocates a new block for extended attributes.
 637 * @ip: A pointer to the inode that's getting extended attributes
 638 * @bhp: Pointer to pointer to a struct buffer_head
 639 *
 640 * Returns: errno
 641 */
 642
 643static int ea_alloc_blk(struct gfs2_inode *ip, struct buffer_head **bhp)
 644{
 645	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 646	struct gfs2_ea_header *ea;
 647	unsigned int n = 1;
 648	u64 block;
 649	int error;
 650
 651	error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 652	if (error)
 653		return error;
 654	gfs2_trans_add_unrevoke(sdp, block, 1);
 655	*bhp = gfs2_meta_new(ip->i_gl, block);
 656	gfs2_trans_add_meta(ip->i_gl, *bhp);
 657	gfs2_metatype_set(*bhp, GFS2_METATYPE_EA, GFS2_FORMAT_EA);
 658	gfs2_buffer_clear_tail(*bhp, sizeof(struct gfs2_meta_header));
 659
 660	ea = GFS2_EA_BH2FIRST(*bhp);
 661	ea->ea_rec_len = cpu_to_be32(sdp->sd_jbsize);
 662	ea->ea_type = GFS2_EATYPE_UNUSED;
 663	ea->ea_flags = GFS2_EAFLAG_LAST;
 664	ea->ea_num_ptrs = 0;
 665
 666	gfs2_add_inode_blocks(&ip->i_inode, 1);
 667
 668	return 0;
 669}
 670
 671/**
 672 * ea_write - writes the request info to an ea, creating new blocks if
 673 *            necessary
 674 * @ip: inode that is being modified
 675 * @ea: the location of the new ea in a block
 676 * @er: the write request
 677 *
 678 * Note: does not update ea_rec_len or the GFS2_EAFLAG_LAST bin of ea_flags
 679 *
 680 * returns : errno
 681 */
 682
 683static int ea_write(struct gfs2_inode *ip, struct gfs2_ea_header *ea,
 684		    struct gfs2_ea_request *er)
 685{
 686	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 687	int error;
 688
 689	ea->ea_data_len = cpu_to_be32(er->er_data_len);
 690	ea->ea_name_len = er->er_name_len;
 691	ea->ea_type = er->er_type;
 692	ea->__pad = 0;
 693
 694	memcpy(GFS2_EA2NAME(ea), er->er_name, er->er_name_len);
 695
 696	if (GFS2_EAREQ_SIZE_STUFFED(er) <= sdp->sd_jbsize) {
 697		ea->ea_num_ptrs = 0;
 698		memcpy(GFS2_EA2DATA(ea), er->er_data, er->er_data_len);
 699	} else {
 700		__be64 *dataptr = GFS2_EA2DATAPTRS(ea);
 701		const char *data = er->er_data;
 702		unsigned int data_len = er->er_data_len;
 703		unsigned int copy;
 704		unsigned int x;
 705
 706		ea->ea_num_ptrs = DIV_ROUND_UP(er->er_data_len, sdp->sd_jbsize);
 707		for (x = 0; x < ea->ea_num_ptrs; x++) {
 708			struct buffer_head *bh;
 709			u64 block;
 710			int mh_size = sizeof(struct gfs2_meta_header);
 711			unsigned int n = 1;
 712
 713			error = gfs2_alloc_blocks(ip, &block, &n, 0, NULL);
 714			if (error)
 715				return error;
 716			gfs2_trans_add_unrevoke(sdp, block, 1);
 717			bh = gfs2_meta_new(ip->i_gl, block);
 718			gfs2_trans_add_meta(ip->i_gl, bh);
 719			gfs2_metatype_set(bh, GFS2_METATYPE_ED, GFS2_FORMAT_ED);
 720
 721			gfs2_add_inode_blocks(&ip->i_inode, 1);
 722
 723			copy = data_len > sdp->sd_jbsize ? sdp->sd_jbsize :
 724							   data_len;
 725			memcpy(bh->b_data + mh_size, data, copy);
 726			if (copy < sdp->sd_jbsize)
 727				memset(bh->b_data + mh_size + copy, 0,
 728				       sdp->sd_jbsize - copy);
 729
 730			*dataptr++ = cpu_to_be64(bh->b_blocknr);
 731			data += copy;
 732			data_len -= copy;
 733
 734			brelse(bh);
 735		}
 736
 737		gfs2_assert_withdraw(sdp, !data_len);
 738	}
 739
 740	return 0;
 741}
 742
 743typedef int (*ea_skeleton_call_t) (struct gfs2_inode *ip,
 744				   struct gfs2_ea_request *er, void *private);
 745
 746static int ea_alloc_skeleton(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 747			     unsigned int blks,
 748			     ea_skeleton_call_t skeleton_call, void *private)
 749{
 750	struct gfs2_alloc_parms ap = { .target = blks };
 751	struct buffer_head *dibh;
 752	int error;
 753
 754	error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
 755	if (error)
 756		return error;
 757
 758	error = gfs2_quota_lock_check(ip, &ap);
 759	if (error)
 760		return error;
 761
 762	error = gfs2_inplace_reserve(ip, &ap);
 763	if (error)
 764		goto out_gunlock_q;
 765
 766	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode),
 767				 blks + gfs2_rg_blocks(ip, blks) +
 768				 RES_DINODE + RES_STATFS + RES_QUOTA, 0);
 769	if (error)
 770		goto out_ipres;
 771
 772	error = skeleton_call(ip, er, private);
 773	if (error)
 774		goto out_end_trans;
 775
 776	error = gfs2_meta_inode_buffer(ip, &dibh);
 777	if (!error) {
 778		ip->i_inode.i_ctime = current_time(&ip->i_inode);
 779		gfs2_trans_add_meta(ip->i_gl, dibh);
 780		gfs2_dinode_out(ip, dibh->b_data);
 781		brelse(dibh);
 782	}
 783
 784out_end_trans:
 785	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 786out_ipres:
 787	gfs2_inplace_release(ip);
 788out_gunlock_q:
 789	gfs2_quota_unlock(ip);
 790	return error;
 791}
 792
 793static int ea_init_i(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 794		     void *private)
 795{
 796	struct buffer_head *bh;
 797	int error;
 798
 799	error = ea_alloc_blk(ip, &bh);
 800	if (error)
 801		return error;
 802
 803	ip->i_eattr = bh->b_blocknr;
 804	error = ea_write(ip, GFS2_EA_BH2FIRST(bh), er);
 805
 806	brelse(bh);
 807
 808	return error;
 809}
 810
 811/**
 812 * ea_init - initializes a new eattr block
 813 * @ip:
 814 * @er:
 815 *
 816 * Returns: errno
 817 */
 818
 819static int ea_init(struct gfs2_inode *ip, int type, const char *name,
 820		   const void *data, size_t size)
 821{
 822	struct gfs2_ea_request er;
 823	unsigned int jbsize = GFS2_SB(&ip->i_inode)->sd_jbsize;
 824	unsigned int blks = 1;
 825
 826	er.er_type = type;
 827	er.er_name = name;
 828	er.er_name_len = strlen(name);
 829	er.er_data = (void *)data;
 830	er.er_data_len = size;
 831
 832	if (GFS2_EAREQ_SIZE_STUFFED(&er) > jbsize)
 833		blks += DIV_ROUND_UP(er.er_data_len, jbsize);
 834
 835	return ea_alloc_skeleton(ip, &er, blks, ea_init_i, NULL);
 836}
 837
 838static struct gfs2_ea_header *ea_split_ea(struct gfs2_ea_header *ea)
 839{
 840	u32 ea_size = GFS2_EA_SIZE(ea);
 841	struct gfs2_ea_header *new = (struct gfs2_ea_header *)((char *)ea +
 842				     ea_size);
 843	u32 new_size = GFS2_EA_REC_LEN(ea) - ea_size;
 844	int last = ea->ea_flags & GFS2_EAFLAG_LAST;
 845
 846	ea->ea_rec_len = cpu_to_be32(ea_size);
 847	ea->ea_flags ^= last;
 848
 849	new->ea_rec_len = cpu_to_be32(new_size);
 850	new->ea_flags = last;
 851
 852	return new;
 853}
 854
 855static void ea_set_remove_stuffed(struct gfs2_inode *ip,
 856				  struct gfs2_ea_location *el)
 857{
 858	struct gfs2_ea_header *ea = el->el_ea;
 859	struct gfs2_ea_header *prev = el->el_prev;
 860	u32 len;
 861
 862	gfs2_trans_add_meta(ip->i_gl, el->el_bh);
 863
 864	if (!prev || !GFS2_EA_IS_STUFFED(ea)) {
 865		ea->ea_type = GFS2_EATYPE_UNUSED;
 866		return;
 867	} else if (GFS2_EA2NEXT(prev) != ea) {
 868		prev = GFS2_EA2NEXT(prev);
 869		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode), GFS2_EA2NEXT(prev) == ea);
 870	}
 871
 872	len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
 873	prev->ea_rec_len = cpu_to_be32(len);
 874
 875	if (GFS2_EA_IS_LAST(ea))
 876		prev->ea_flags |= GFS2_EAFLAG_LAST;
 877}
 878
 879struct ea_set {
 880	int ea_split;
 881
 882	struct gfs2_ea_request *es_er;
 883	struct gfs2_ea_location *es_el;
 884
 885	struct buffer_head *es_bh;
 886	struct gfs2_ea_header *es_ea;
 887};
 888
 889static int ea_set_simple_noalloc(struct gfs2_inode *ip, struct buffer_head *bh,
 890				 struct gfs2_ea_header *ea, struct ea_set *es)
 891{
 892	struct gfs2_ea_request *er = es->es_er;
 893	struct buffer_head *dibh;
 894	int error;
 895
 896	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + 2 * RES_EATTR, 0);
 897	if (error)
 898		return error;
 899
 900	gfs2_trans_add_meta(ip->i_gl, bh);
 901
 902	if (es->ea_split)
 903		ea = ea_split_ea(ea);
 904
 905	ea_write(ip, ea, er);
 906
 907	if (es->es_el)
 908		ea_set_remove_stuffed(ip, es->es_el);
 909
 910	error = gfs2_meta_inode_buffer(ip, &dibh);
 911	if (error)
 912		goto out;
 913	ip->i_inode.i_ctime = current_time(&ip->i_inode);
 914	gfs2_trans_add_meta(ip->i_gl, dibh);
 915	gfs2_dinode_out(ip, dibh->b_data);
 916	brelse(dibh);
 917out:
 918	gfs2_trans_end(GFS2_SB(&ip->i_inode));
 919	return error;
 920}
 921
 922static int ea_set_simple_alloc(struct gfs2_inode *ip,
 923			       struct gfs2_ea_request *er, void *private)
 924{
 925	struct ea_set *es = private;
 926	struct gfs2_ea_header *ea = es->es_ea;
 927	int error;
 928
 929	gfs2_trans_add_meta(ip->i_gl, es->es_bh);
 930
 931	if (es->ea_split)
 932		ea = ea_split_ea(ea);
 933
 934	error = ea_write(ip, ea, er);
 935	if (error)
 936		return error;
 937
 938	if (es->es_el)
 939		ea_set_remove_stuffed(ip, es->es_el);
 940
 941	return 0;
 942}
 943
 944static int ea_set_simple(struct gfs2_inode *ip, struct buffer_head *bh,
 945			 struct gfs2_ea_header *ea, struct gfs2_ea_header *prev,
 946			 void *private)
 947{
 948	struct ea_set *es = private;
 949	unsigned int size;
 950	int stuffed;
 951	int error;
 952
 953	stuffed = ea_calc_size(GFS2_SB(&ip->i_inode), es->es_er->er_name_len,
 954			       es->es_er->er_data_len, &size);
 955
 956	if (ea->ea_type == GFS2_EATYPE_UNUSED) {
 957		if (GFS2_EA_REC_LEN(ea) < size)
 958			return 0;
 959		if (!GFS2_EA_IS_STUFFED(ea)) {
 960			error = ea_remove_unstuffed(ip, bh, ea, prev, 1);
 961			if (error)
 962				return error;
 963		}
 964		es->ea_split = 0;
 965	} else if (GFS2_EA_REC_LEN(ea) - GFS2_EA_SIZE(ea) >= size)
 966		es->ea_split = 1;
 967	else
 968		return 0;
 969
 970	if (stuffed) {
 971		error = ea_set_simple_noalloc(ip, bh, ea, es);
 972		if (error)
 973			return error;
 974	} else {
 975		unsigned int blks;
 976
 977		es->es_bh = bh;
 978		es->es_ea = ea;
 979		blks = 2 + DIV_ROUND_UP(es->es_er->er_data_len,
 980					GFS2_SB(&ip->i_inode)->sd_jbsize);
 981
 982		error = ea_alloc_skeleton(ip, es->es_er, blks,
 983					  ea_set_simple_alloc, es);
 984		if (error)
 985			return error;
 986	}
 987
 988	return 1;
 989}
 990
 991static int ea_set_block(struct gfs2_inode *ip, struct gfs2_ea_request *er,
 992			void *private)
 993{
 994	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
 995	struct buffer_head *indbh, *newbh;
 996	__be64 *eablk;
 997	int error;
 998	int mh_size = sizeof(struct gfs2_meta_header);
 999
1000	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1001		__be64 *end;
1002
1003		error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0,
1004				       &indbh);
1005		if (error)
1006			return error;
1007
1008		if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1009			error = -EIO;
1010			goto out;
1011		}
1012
1013		eablk = (__be64 *)(indbh->b_data + mh_size);
1014		end = eablk + sdp->sd_inptrs;
1015
1016		for (; eablk < end; eablk++)
1017			if (!*eablk)
1018				break;
1019
1020		if (eablk == end) {
1021			error = -ENOSPC;
1022			goto out;
1023		}
1024
1025		gfs2_trans_add_meta(ip->i_gl, indbh);
1026	} else {
1027		u64 blk;
1028		unsigned int n = 1;
1029		error = gfs2_alloc_blocks(ip, &blk, &n, 0, NULL);
1030		if (error)
1031			return error;
1032		gfs2_trans_add_unrevoke(sdp, blk, 1);
1033		indbh = gfs2_meta_new(ip->i_gl, blk);
1034		gfs2_trans_add_meta(ip->i_gl, indbh);
1035		gfs2_metatype_set(indbh, GFS2_METATYPE_IN, GFS2_FORMAT_IN);
1036		gfs2_buffer_clear_tail(indbh, mh_size);
1037
1038		eablk = (__be64 *)(indbh->b_data + mh_size);
1039		*eablk = cpu_to_be64(ip->i_eattr);
1040		ip->i_eattr = blk;
1041		ip->i_diskflags |= GFS2_DIF_EA_INDIRECT;
1042		gfs2_add_inode_blocks(&ip->i_inode, 1);
1043
1044		eablk++;
1045	}
1046
1047	error = ea_alloc_blk(ip, &newbh);
1048	if (error)
1049		goto out;
1050
1051	*eablk = cpu_to_be64((u64)newbh->b_blocknr);
1052	error = ea_write(ip, GFS2_EA_BH2FIRST(newbh), er);
1053	brelse(newbh);
1054	if (error)
1055		goto out;
1056
1057	if (private)
1058		ea_set_remove_stuffed(ip, private);
1059
1060out:
1061	brelse(indbh);
1062	return error;
1063}
1064
1065static int ea_set_i(struct gfs2_inode *ip, int type, const char *name,
1066		    const void *value, size_t size, struct gfs2_ea_location *el)
1067{
1068	struct gfs2_ea_request er;
1069	struct ea_set es;
1070	unsigned int blks = 2;
1071	int error;
1072
1073	er.er_type = type;
1074	er.er_name = name;
1075	er.er_data = (void *)value;
1076	er.er_name_len = strlen(name);
1077	er.er_data_len = size;
1078
1079	memset(&es, 0, sizeof(struct ea_set));
1080	es.es_er = &er;
1081	es.es_el = el;
1082
1083	error = ea_foreach(ip, ea_set_simple, &es);
1084	if (error > 0)
1085		return 0;
1086	if (error)
1087		return error;
1088
1089	if (!(ip->i_diskflags & GFS2_DIF_EA_INDIRECT))
1090		blks++;
1091	if (GFS2_EAREQ_SIZE_STUFFED(&er) > GFS2_SB(&ip->i_inode)->sd_jbsize)
1092		blks += DIV_ROUND_UP(er.er_data_len, GFS2_SB(&ip->i_inode)->sd_jbsize);
1093
1094	return ea_alloc_skeleton(ip, &er, blks, ea_set_block, el);
1095}
1096
1097static int ea_set_remove_unstuffed(struct gfs2_inode *ip,
1098				   struct gfs2_ea_location *el)
1099{
1100	if (el->el_prev && GFS2_EA2NEXT(el->el_prev) != el->el_ea) {
1101		el->el_prev = GFS2_EA2NEXT(el->el_prev);
1102		gfs2_assert_withdraw(GFS2_SB(&ip->i_inode),
1103				     GFS2_EA2NEXT(el->el_prev) == el->el_ea);
1104	}
1105
1106	return ea_remove_unstuffed(ip, el->el_bh, el->el_ea, el->el_prev, 0);
1107}
1108
1109static int ea_remove_stuffed(struct gfs2_inode *ip, struct gfs2_ea_location *el)
1110{
1111	struct gfs2_ea_header *ea = el->el_ea;
1112	struct gfs2_ea_header *prev = el->el_prev;
1113	struct buffer_head *dibh;
1114	int error;
1115
1116	error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE + RES_EATTR, 0);
1117	if (error)
1118		return error;
1119
1120	gfs2_trans_add_meta(ip->i_gl, el->el_bh);
1121
1122	if (prev) {
1123		u32 len;
1124
1125		len = GFS2_EA_REC_LEN(prev) + GFS2_EA_REC_LEN(ea);
1126		prev->ea_rec_len = cpu_to_be32(len);
1127
1128		if (GFS2_EA_IS_LAST(ea))
1129			prev->ea_flags |= GFS2_EAFLAG_LAST;
1130	} else {
1131		ea->ea_type = GFS2_EATYPE_UNUSED;
1132	}
1133
1134	error = gfs2_meta_inode_buffer(ip, &dibh);
1135	if (!error) {
1136		ip->i_inode.i_ctime = current_time(&ip->i_inode);
1137		gfs2_trans_add_meta(ip->i_gl, dibh);
1138		gfs2_dinode_out(ip, dibh->b_data);
1139		brelse(dibh);
1140	}
1141
1142	gfs2_trans_end(GFS2_SB(&ip->i_inode));
1143
1144	return error;
1145}
1146
1147/**
1148 * gfs2_xattr_remove - Remove a GFS2 extended attribute
1149 * @ip: The inode
1150 * @type: The type of the extended attribute
1151 * @name: The name of the extended attribute
1152 *
1153 * This is not called directly by the VFS since we use the (common)
1154 * scheme of making a "set with NULL data" mean a remove request. Note
1155 * that this is different from a set with zero length data.
1156 *
1157 * Returns: 0, or errno on failure
1158 */
1159
1160static int gfs2_xattr_remove(struct gfs2_inode *ip, int type, const char *name)
1161{
1162	struct gfs2_ea_location el;
1163	int error;
1164
1165	if (!ip->i_eattr)
1166		return -ENODATA;
1167
1168	error = gfs2_ea_find(ip, type, name, &el);
1169	if (error)
1170		return error;
1171	if (!el.el_ea)
1172		return -ENODATA;
1173
1174	if (GFS2_EA_IS_STUFFED(el.el_ea))
1175		error = ea_remove_stuffed(ip, &el);
1176	else
1177		error = ea_remove_unstuffed(ip, el.el_bh, el.el_ea, el.el_prev, 0);
1178
1179	brelse(el.el_bh);
1180
1181	return error;
1182}
1183
1184/**
1185 * __gfs2_xattr_set - Set (or remove) a GFS2 extended attribute
1186 * @ip: The inode
1187 * @name: The name of the extended attribute
1188 * @value: The value of the extended attribute (NULL for remove)
1189 * @size: The size of the @value argument
1190 * @flags: Create or Replace
1191 * @type: The type of the extended attribute
1192 *
1193 * See gfs2_xattr_remove() for details of the removal of xattrs.
1194 *
1195 * Returns: 0 or errno on failure
1196 */
1197
1198int __gfs2_xattr_set(struct inode *inode, const char *name,
1199		   const void *value, size_t size, int flags, int type)
1200{
1201	struct gfs2_inode *ip = GFS2_I(inode);
1202	struct gfs2_sbd *sdp = GFS2_SB(inode);
1203	struct gfs2_ea_location el;
1204	unsigned int namel = strlen(name);
1205	int error;
1206
1207	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
1208		return -EPERM;
1209	if (namel > GFS2_EA_MAX_NAME_LEN)
1210		return -ERANGE;
1211
1212	if (value == NULL)
1213		return gfs2_xattr_remove(ip, type, name);
1214
1215	if (ea_check_size(sdp, namel, size))
1216		return -ERANGE;
1217
1218	if (!ip->i_eattr) {
1219		if (flags & XATTR_REPLACE)
1220			return -ENODATA;
1221		return ea_init(ip, type, name, value, size);
1222	}
1223
1224	error = gfs2_ea_find(ip, type, name, &el);
1225	if (error)
1226		return error;
1227
1228	if (el.el_ea) {
1229		if (ip->i_diskflags & GFS2_DIF_APPENDONLY) {
1230			brelse(el.el_bh);
1231			return -EPERM;
1232		}
1233
1234		error = -EEXIST;
1235		if (!(flags & XATTR_CREATE)) {
1236			int unstuffed = !GFS2_EA_IS_STUFFED(el.el_ea);
1237			error = ea_set_i(ip, type, name, value, size, &el);
1238			if (!error && unstuffed)
1239				ea_set_remove_unstuffed(ip, &el);
1240		}
1241
1242		brelse(el.el_bh);
1243		return error;
1244	}
1245
1246	error = -ENODATA;
1247	if (!(flags & XATTR_REPLACE))
1248		error = ea_set_i(ip, type, name, value, size, NULL);
1249
1250	return error;
1251}
1252
1253static int gfs2_xattr_set(const struct xattr_handler *handler,
1254			  struct dentry *unused, struct inode *inode,
1255			  const char *name, const void *value,
1256			  size_t size, int flags)
1257{
1258	struct gfs2_inode *ip = GFS2_I(inode);
1259	struct gfs2_holder gh;
1260	int ret;
1261
1262	ret = gfs2_rsqa_alloc(ip);
1263	if (ret)
1264		return ret;
1265
1266	ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1267	if (ret)
1268		return ret;
1269	ret = __gfs2_xattr_set(inode, name, value, size, flags, handler->flags);
1270	gfs2_glock_dq_uninit(&gh);
1271	return ret;
1272}
1273
1274static int ea_dealloc_indirect(struct gfs2_inode *ip)
1275{
1276	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1277	struct gfs2_rgrp_list rlist;
1278	struct buffer_head *indbh, *dibh;
1279	__be64 *eablk, *end;
1280	unsigned int rg_blocks = 0;
1281	u64 bstart = 0;
1282	unsigned int blen = 0;
1283	unsigned int blks = 0;
1284	unsigned int x;
1285	int error;
1286
1287	error = gfs2_rindex_update(sdp);
1288	if (error)
1289		return error;
1290
1291	memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
1292
1293	error = gfs2_meta_read(ip->i_gl, ip->i_eattr, DIO_WAIT, 0, &indbh);
1294	if (error)
1295		return error;
1296
1297	if (gfs2_metatype_check(sdp, indbh, GFS2_METATYPE_IN)) {
1298		error = -EIO;
1299		goto out;
1300	}
1301
1302	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1303	end = eablk + sdp->sd_inptrs;
1304
1305	for (; eablk < end; eablk++) {
1306		u64 bn;
1307
1308		if (!*eablk)
1309			break;
1310		bn = be64_to_cpu(*eablk);
1311
1312		if (bstart + blen == bn)
1313			blen++;
1314		else {
1315			if (bstart)
1316				gfs2_rlist_add(ip, &rlist, bstart);
1317			bstart = bn;
1318			blen = 1;
1319		}
1320		blks++;
1321	}
1322	if (bstart)
1323		gfs2_rlist_add(ip, &rlist, bstart);
1324	else
1325		goto out;
1326
1327	gfs2_rlist_alloc(&rlist, LM_ST_EXCLUSIVE);
1328
1329	for (x = 0; x < rlist.rl_rgrps; x++) {
1330		struct gfs2_rgrpd *rgd = gfs2_glock2rgrp(rlist.rl_ghs[x].gh_gl);
1331
1332		rg_blocks += rgd->rd_length;
1333	}
1334
1335	error = gfs2_glock_nq_m(rlist.rl_rgrps, rlist.rl_ghs);
1336	if (error)
1337		goto out_rlist_free;
1338
1339	error = gfs2_trans_begin(sdp, rg_blocks + RES_DINODE + RES_INDIRECT +
1340				 RES_STATFS + RES_QUOTA, blks);
1341	if (error)
1342		goto out_gunlock;
1343
1344	gfs2_trans_add_meta(ip->i_gl, indbh);
1345
1346	eablk = (__be64 *)(indbh->b_data + sizeof(struct gfs2_meta_header));
1347	bstart = 0;
1348	blen = 0;
1349
1350	for (; eablk < end; eablk++) {
1351		u64 bn;
1352
1353		if (!*eablk)
1354			break;
1355		bn = be64_to_cpu(*eablk);
1356
1357		if (bstart + blen == bn)
1358			blen++;
1359		else {
1360			if (bstart)
1361				gfs2_free_meta(ip, bstart, blen);
1362			bstart = bn;
1363			blen = 1;
1364		}
1365
1366		*eablk = 0;
1367		gfs2_add_inode_blocks(&ip->i_inode, -1);
1368	}
1369	if (bstart)
1370		gfs2_free_meta(ip, bstart, blen);
1371
1372	ip->i_diskflags &= ~GFS2_DIF_EA_INDIRECT;
1373
1374	error = gfs2_meta_inode_buffer(ip, &dibh);
1375	if (!error) {
1376		gfs2_trans_add_meta(ip->i_gl, dibh);
1377		gfs2_dinode_out(ip, dibh->b_data);
1378		brelse(dibh);
1379	}
1380
1381	gfs2_trans_end(sdp);
1382
1383out_gunlock:
1384	gfs2_glock_dq_m(rlist.rl_rgrps, rlist.rl_ghs);
1385out_rlist_free:
1386	gfs2_rlist_free(&rlist);
1387out:
1388	brelse(indbh);
1389	return error;
1390}
1391
1392static int ea_dealloc_block(struct gfs2_inode *ip)
1393{
1394	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1395	struct gfs2_rgrpd *rgd;
1396	struct buffer_head *dibh;
1397	struct gfs2_holder gh;
1398	int error;
1399
1400	error = gfs2_rindex_update(sdp);
1401	if (error)
1402		return error;
1403
1404	rgd = gfs2_blk2rgrpd(sdp, ip->i_eattr, 1);
1405	if (!rgd) {
1406		gfs2_consist_inode(ip);
1407		return -EIO;
1408	}
1409
1410	error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1411	if (error)
1412		return error;
1413
1414	error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_DINODE + RES_STATFS +
1415				 RES_QUOTA, 1);
1416	if (error)
1417		goto out_gunlock;
1418
1419	gfs2_free_meta(ip, ip->i_eattr, 1);
1420
1421	ip->i_eattr = 0;
1422	gfs2_add_inode_blocks(&ip->i_inode, -1);
1423
1424	error = gfs2_meta_inode_buffer(ip, &dibh);
1425	if (!error) {
1426		gfs2_trans_add_meta(ip->i_gl, dibh);
1427		gfs2_dinode_out(ip, dibh->b_data);
1428		brelse(dibh);
1429	}
1430
1431	gfs2_trans_end(sdp);
1432
1433out_gunlock:
1434	gfs2_glock_dq_uninit(&gh);
1435	return error;
1436}
1437
1438/**
1439 * gfs2_ea_dealloc - deallocate the extended attribute fork
1440 * @ip: the inode
1441 *
1442 * Returns: errno
1443 */
1444
1445int gfs2_ea_dealloc(struct gfs2_inode *ip)
1446{
1447	int error;
1448
1449	error = gfs2_rindex_update(GFS2_SB(&ip->i_inode));
1450	if (error)
1451		return error;
1452
1453	error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1454	if (error)
1455		return error;
1456
1457	error = ea_foreach(ip, ea_dealloc_unstuffed, NULL);
1458	if (error)
1459		goto out_quota;
1460
1461	if (ip->i_diskflags & GFS2_DIF_EA_INDIRECT) {
1462		error = ea_dealloc_indirect(ip);
1463		if (error)
1464			goto out_quota;
1465	}
1466
1467	error = ea_dealloc_block(ip);
1468
1469out_quota:
1470	gfs2_quota_unhold(ip);
1471	return error;
1472}
1473
1474static const struct xattr_handler gfs2_xattr_user_handler = {
1475	.prefix = XATTR_USER_PREFIX,
1476	.flags  = GFS2_EATYPE_USR,
1477	.get    = gfs2_xattr_get,
1478	.set    = gfs2_xattr_set,
1479};
1480
1481static const struct xattr_handler gfs2_xattr_security_handler = {
1482	.prefix = XATTR_SECURITY_PREFIX,
1483	.flags  = GFS2_EATYPE_SECURITY,
1484	.get    = gfs2_xattr_get,
1485	.set    = gfs2_xattr_set,
1486};
1487
1488const struct xattr_handler *gfs2_xattr_handlers[] = {
1489	&gfs2_xattr_user_handler,
1490	&gfs2_xattr_security_handler,
1491	&posix_acl_access_xattr_handler,
1492	&posix_acl_default_xattr_handler,
1493	NULL,
1494};
1495