1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * xattr.c
   5 *
   6 * Copyright (C) 2004, 2008 Oracle.  All rights reserved.
   7 *
   8 * CREDITS:
   9 * Lots of code in this file is copy from linux/fs/ext3/xattr.c.
  10 * Copyright (C) 2001-2003 Andreas Gruenbacher, <agruen@suse.de>
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public
  14 * License version 2 as published by the Free Software Foundation.
  15 *
  16 * This program is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 * General Public License for more details.
  20 */
  21
  22#include <linux/capability.h>
  23#include <linux/fs.h>
  24#include <linux/types.h>
  25#include <linux/slab.h>
  26#include <linux/highmem.h>
  27#include <linux/pagemap.h>
  28#include <linux/uio.h>
  29#include <linux/sched.h>
  30#include <linux/splice.h>
  31#include <linux/mount.h>
  32#include <linux/writeback.h>
  33#include <linux/falloc.h>
  34#include <linux/sort.h>
  35#include <linux/init.h>
  36#include <linux/module.h>
  37#include <linux/string.h>
  38#include <linux/security.h>
  39
  40#include <cluster/masklog.h>
  41
  42#include "ocfs2.h"
  43#include "alloc.h"
  44#include "blockcheck.h"
  45#include "dlmglue.h"
  46#include "file.h"
  47#include "symlink.h"
  48#include "sysfile.h"
  49#include "inode.h"
  50#include "journal.h"
  51#include "ocfs2_fs.h"
  52#include "suballoc.h"
  53#include "uptodate.h"
  54#include "buffer_head_io.h"
  55#include "super.h"
  56#include "xattr.h"
  57#include "refcounttree.h"
  58#include "acl.h"
  59#include "ocfs2_trace.h"
  60
  61struct ocfs2_xattr_def_value_root {
  62	struct ocfs2_xattr_value_root	xv;
  63	struct ocfs2_extent_rec		er;
  64};
  65
  66struct ocfs2_xattr_bucket {
  67	/* The inode these xattrs are associated with */
  68	struct inode *bu_inode;
  69
  70	/* The actual buffers that make up the bucket */
  71	struct buffer_head *bu_bhs[OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET];
  72
  73	/* How many blocks make up one bucket for this filesystem */
  74	int bu_blocks;
  75};
  76
  77struct ocfs2_xattr_set_ctxt {
  78	handle_t *handle;
  79	struct ocfs2_alloc_context *meta_ac;
  80	struct ocfs2_alloc_context *data_ac;
  81	struct ocfs2_cached_dealloc_ctxt dealloc;
  82	int set_abort;
  83};
  84
  85#define OCFS2_XATTR_ROOT_SIZE	(sizeof(struct ocfs2_xattr_def_value_root))
  86#define OCFS2_XATTR_INLINE_SIZE	80
  87#define OCFS2_XATTR_HEADER_GAP	4
  88#define OCFS2_XATTR_FREE_IN_IBODY	(OCFS2_MIN_XATTR_INLINE_SIZE \
  89					 - sizeof(struct ocfs2_xattr_header) \
  90					 - OCFS2_XATTR_HEADER_GAP)
  91#define OCFS2_XATTR_FREE_IN_BLOCK(ptr)	((ptr)->i_sb->s_blocksize \
  92					 - sizeof(struct ocfs2_xattr_block) \
  93					 - sizeof(struct ocfs2_xattr_header) \
  94					 - OCFS2_XATTR_HEADER_GAP)
  95
  96static struct ocfs2_xattr_def_value_root def_xv = {
  97	.xv.xr_list.l_count = cpu_to_le16(1),
  98};
  99
 100const struct xattr_handler *ocfs2_xattr_handlers[] = {
 101	&ocfs2_xattr_user_handler,
 102	&ocfs2_xattr_acl_access_handler,
 103	&ocfs2_xattr_acl_default_handler,
 104	&ocfs2_xattr_trusted_handler,
 105	&ocfs2_xattr_security_handler,
 106	NULL
 107};
 108
 109static const struct xattr_handler *ocfs2_xattr_handler_map[OCFS2_XATTR_MAX] = {
 110	[OCFS2_XATTR_INDEX_USER]	= &ocfs2_xattr_user_handler,
 111	[OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS]
 112					= &ocfs2_xattr_acl_access_handler,
 113	[OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT]
 114					= &ocfs2_xattr_acl_default_handler,
 115	[OCFS2_XATTR_INDEX_TRUSTED]	= &ocfs2_xattr_trusted_handler,
 116	[OCFS2_XATTR_INDEX_SECURITY]	= &ocfs2_xattr_security_handler,
 117};
 118
 119struct ocfs2_xattr_info {
 120	int		xi_name_index;
 121	const char	*xi_name;
 122	int		xi_name_len;
 123	const void	*xi_value;
 124	size_t		xi_value_len;
 125};
 126
 127struct ocfs2_xattr_search {
 128	struct buffer_head *inode_bh;
 129	/*
 130	 * xattr_bh point to the block buffer head which has extended attribute
 131	 * when extended attribute in inode, xattr_bh is equal to inode_bh.
 132	 */
 133	struct buffer_head *xattr_bh;
 134	struct ocfs2_xattr_header *header;
 135	struct ocfs2_xattr_bucket *bucket;
 136	void *base;
 137	void *end;
 138	struct ocfs2_xattr_entry *here;
 139	int not_found;
 140};
 141
 142/* Operations on struct ocfs2_xa_entry */
 143struct ocfs2_xa_loc;
 144struct ocfs2_xa_loc_operations {
 145	/*
 146	 * Journal functions
 147	 */
 148	int (*xlo_journal_access)(handle_t *handle, struct ocfs2_xa_loc *loc,
 149				  int type);
 150	void (*xlo_journal_dirty)(handle_t *handle, struct ocfs2_xa_loc *loc);
 151
 152	/*
 153	 * Return a pointer to the appropriate buffer in loc->xl_storage
 154	 * at the given offset from loc->xl_header.
 155	 */
 156	void *(*xlo_offset_pointer)(struct ocfs2_xa_loc *loc, int offset);
 157
 158	/* Can we reuse the existing entry for the new value? */
 159	int (*xlo_can_reuse)(struct ocfs2_xa_loc *loc,
 160			     struct ocfs2_xattr_info *xi);
 161
 162	/* How much space is needed for the new value? */
 163	int (*xlo_check_space)(struct ocfs2_xa_loc *loc,
 164			       struct ocfs2_xattr_info *xi);
 165
 166	/*
 167	 * Return the offset of the first name+value pair.  This is
 168	 * the start of our downward-filling free space.
 169	 */
 170	int (*xlo_get_free_start)(struct ocfs2_xa_loc *loc);
 171
 172	/*
 173	 * Remove the name+value at this location.  Do whatever is
 174	 * appropriate with the remaining name+value pairs.
 175	 */
 176	void (*xlo_wipe_namevalue)(struct ocfs2_xa_loc *loc);
 177
 178	/* Fill xl_entry with a new entry */
 179	void (*xlo_add_entry)(struct ocfs2_xa_loc *loc, u32 name_hash);
 180
 181	/* Add name+value storage to an entry */
 182	void (*xlo_add_namevalue)(struct ocfs2_xa_loc *loc, int size);
 183
 184	/*
 185	 * Initialize the value buf's access and bh fields for this entry.
 186	 * ocfs2_xa_fill_value_buf() will handle the xv pointer.
 187	 */
 188	void (*xlo_fill_value_buf)(struct ocfs2_xa_loc *loc,
 189				   struct ocfs2_xattr_value_buf *vb);
 190};
 191
 192/*
 193 * Describes an xattr entry location.  This is a memory structure
 194 * tracking the on-disk structure.
 195 */
 196struct ocfs2_xa_loc {
 197	/* This xattr belongs to this inode */
 198	struct inode *xl_inode;
 199
 200	/* The ocfs2_xattr_header inside the on-disk storage. Not NULL. */
 201	struct ocfs2_xattr_header *xl_header;
 202
 203	/* Bytes from xl_header to the end of the storage */
 204	int xl_size;
 205
 206	/*
 207	 * The ocfs2_xattr_entry this location describes.  If this is
 208	 * NULL, this location describes the on-disk structure where it
 209	 * would have been.
 210	 */
 211	struct ocfs2_xattr_entry *xl_entry;
 212
 213	/*
 214	 * Internal housekeeping
 215	 */
 216
 217	/* Buffer(s) containing this entry */
 218	void *xl_storage;
 219
 220	/* Operations on the storage backing this location */
 221	const struct ocfs2_xa_loc_operations *xl_ops;
 222};
 223
 224/*
 225 * Convenience functions to calculate how much space is needed for a
 226 * given name+value pair
 227 */
 228static int namevalue_size(int name_len, uint64_t value_len)
 229{
 230	if (value_len > OCFS2_XATTR_INLINE_SIZE)
 231		return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_ROOT_SIZE;
 232	else
 233		return OCFS2_XATTR_SIZE(name_len) + OCFS2_XATTR_SIZE(value_len);
 234}
 235
 236static int namevalue_size_xi(struct ocfs2_xattr_info *xi)
 237{
 238	return namevalue_size(xi->xi_name_len, xi->xi_value_len);
 239}
 240
 241static int namevalue_size_xe(struct ocfs2_xattr_entry *xe)
 242{
 243	u64 value_len = le64_to_cpu(xe->xe_value_size);
 244
 245	BUG_ON((value_len > OCFS2_XATTR_INLINE_SIZE) &&
 246	       ocfs2_xattr_is_local(xe));
 247	return namevalue_size(xe->xe_name_len, value_len);
 248}
 249
 250
 251static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
 252					     struct ocfs2_xattr_header *xh,
 253					     int index,
 254					     int *block_off,
 255					     int *new_offset);
 256
 257static int ocfs2_xattr_block_find(struct inode *inode,
 258				  int name_index,
 259				  const char *name,
 260				  struct ocfs2_xattr_search *xs);
 261static int ocfs2_xattr_index_block_find(struct inode *inode,
 262					struct buffer_head *root_bh,
 263					int name_index,
 264					const char *name,
 265					struct ocfs2_xattr_search *xs);
 266
 267static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
 268					struct buffer_head *blk_bh,
 269					char *buffer,
 270					size_t buffer_size);
 271
 272static int ocfs2_xattr_create_index_block(struct inode *inode,
 273					  struct ocfs2_xattr_search *xs,
 274					  struct ocfs2_xattr_set_ctxt *ctxt);
 275
 276static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
 277					     struct ocfs2_xattr_info *xi,
 278					     struct ocfs2_xattr_search *xs,
 279					     struct ocfs2_xattr_set_ctxt *ctxt);
 280
 281typedef int (xattr_tree_rec_func)(struct inode *inode,
 282				  struct buffer_head *root_bh,
 283				  u64 blkno, u32 cpos, u32 len, void *para);
 284static int ocfs2_iterate_xattr_index_block(struct inode *inode,
 285					   struct buffer_head *root_bh,
 286					   xattr_tree_rec_func *rec_func,
 287					   void *para);
 288static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
 289					struct ocfs2_xattr_bucket *bucket,
 290					void *para);
 291static int ocfs2_rm_xattr_cluster(struct inode *inode,
 292				  struct buffer_head *root_bh,
 293				  u64 blkno,
 294				  u32 cpos,
 295				  u32 len,
 296				  void *para);
 297
 298static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
 299				  u64 src_blk, u64 last_blk, u64 to_blk,
 300				  unsigned int start_bucket,
 301				  u32 *first_hash);
 302static int ocfs2_prepare_refcount_xattr(struct inode *inode,
 303					struct ocfs2_dinode *di,
 304					struct ocfs2_xattr_info *xi,
 305					struct ocfs2_xattr_search *xis,
 306					struct ocfs2_xattr_search *xbs,
 307					struct ocfs2_refcount_tree **ref_tree,
 308					int *meta_need,
 309					int *credits);
 310static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
 311					   struct ocfs2_xattr_bucket *bucket,
 312					   int offset,
 313					   struct ocfs2_xattr_value_root **xv,
 314					   struct buffer_head **bh);
 315
 316static inline u16 ocfs2_xattr_buckets_per_cluster(struct ocfs2_super *osb)
 317{
 318	return (1 << osb->s_clustersize_bits) / OCFS2_XATTR_BUCKET_SIZE;
 319}
 320
 321static inline u16 ocfs2_blocks_per_xattr_bucket(struct super_block *sb)
 322{
 323	return OCFS2_XATTR_BUCKET_SIZE / (1 << sb->s_blocksize_bits);
 324}
 325
 326#define bucket_blkno(_b) ((_b)->bu_bhs[0]->b_blocknr)
 327#define bucket_block(_b, _n) ((_b)->bu_bhs[(_n)]->b_data)
 328#define bucket_xh(_b) ((struct ocfs2_xattr_header *)bucket_block((_b), 0))
 329
 330static struct ocfs2_xattr_bucket *ocfs2_xattr_bucket_new(struct inode *inode)
 331{
 332	struct ocfs2_xattr_bucket *bucket;
 333	int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
 334
 335	BUG_ON(blks > OCFS2_XATTR_MAX_BLOCKS_PER_BUCKET);
 336
 337	bucket = kzalloc(sizeof(struct ocfs2_xattr_bucket), GFP_NOFS);
 338	if (bucket) {
 339		bucket->bu_inode = inode;
 340		bucket->bu_blocks = blks;
 341	}
 342
 343	return bucket;
 344}
 345
 346static void ocfs2_xattr_bucket_relse(struct ocfs2_xattr_bucket *bucket)
 347{
 348	int i;
 349
 350	for (i = 0; i < bucket->bu_blocks; i++) {
 351		brelse(bucket->bu_bhs[i]);
 352		bucket->bu_bhs[i] = NULL;
 353	}
 354}
 355
 356static void ocfs2_xattr_bucket_free(struct ocfs2_xattr_bucket *bucket)
 357{
 358	if (bucket) {
 359		ocfs2_xattr_bucket_relse(bucket);
 360		bucket->bu_inode = NULL;
 361		kfree(bucket);
 362	}
 363}
 364
 365/*
 366 * A bucket that has never been written to disk doesn't need to be
 367 * read.  We just need the buffer_heads.  Don't call this for
 368 * buckets that are already on disk.  ocfs2_read_xattr_bucket() initializes
 369 * them fully.
 370 */
 371static int ocfs2_init_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 372				   u64 xb_blkno)
 373{
 374	int i, rc = 0;
 375
 376	for (i = 0; i < bucket->bu_blocks; i++) {
 377		bucket->bu_bhs[i] = sb_getblk(bucket->bu_inode->i_sb,
 378					      xb_blkno + i);
 379		if (!bucket->bu_bhs[i]) {
 380			rc = -EIO;
 381			mlog_errno(rc);
 382			break;
 383		}
 384
 385		if (!ocfs2_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 386					   bucket->bu_bhs[i]))
 387			ocfs2_set_new_buffer_uptodate(INODE_CACHE(bucket->bu_inode),
 388						      bucket->bu_bhs[i]);
 
 
 
 
 
 
 
 389	}
 390
 391	if (rc)
 392		ocfs2_xattr_bucket_relse(bucket);
 393	return rc;
 394}
 395
 396/* Read the xattr bucket at xb_blkno */
 397static int ocfs2_read_xattr_bucket(struct ocfs2_xattr_bucket *bucket,
 398				   u64 xb_blkno)
 399{
 400	int rc;
 401
 402	rc = ocfs2_read_blocks(INODE_CACHE(bucket->bu_inode), xb_blkno,
 403			       bucket->bu_blocks, bucket->bu_bhs, 0,
 404			       NULL);
 405	if (!rc) {
 406		spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 407		rc = ocfs2_validate_meta_ecc_bhs(bucket->bu_inode->i_sb,
 408						 bucket->bu_bhs,
 409						 bucket->bu_blocks,
 410						 &bucket_xh(bucket)->xh_check);
 411		spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 412		if (rc)
 413			mlog_errno(rc);
 414	}
 415
 416	if (rc)
 417		ocfs2_xattr_bucket_relse(bucket);
 418	return rc;
 419}
 420
 421static int ocfs2_xattr_bucket_journal_access(handle_t *handle,
 422					     struct ocfs2_xattr_bucket *bucket,
 423					     int type)
 424{
 425	int i, rc = 0;
 426
 427	for (i = 0; i < bucket->bu_blocks; i++) {
 428		rc = ocfs2_journal_access(handle,
 429					  INODE_CACHE(bucket->bu_inode),
 430					  bucket->bu_bhs[i], type);
 431		if (rc) {
 432			mlog_errno(rc);
 433			break;
 434		}
 435	}
 436
 437	return rc;
 438}
 439
 440static void ocfs2_xattr_bucket_journal_dirty(handle_t *handle,
 441					     struct ocfs2_xattr_bucket *bucket)
 442{
 443	int i;
 444
 445	spin_lock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 446	ocfs2_compute_meta_ecc_bhs(bucket->bu_inode->i_sb,
 447				   bucket->bu_bhs, bucket->bu_blocks,
 448				   &bucket_xh(bucket)->xh_check);
 449	spin_unlock(&OCFS2_SB(bucket->bu_inode->i_sb)->osb_xattr_lock);
 450
 451	for (i = 0; i < bucket->bu_blocks; i++)
 452		ocfs2_journal_dirty(handle, bucket->bu_bhs[i]);
 453}
 454
 455static void ocfs2_xattr_bucket_copy_data(struct ocfs2_xattr_bucket *dest,
 456					 struct ocfs2_xattr_bucket *src)
 457{
 458	int i;
 459	int blocksize = src->bu_inode->i_sb->s_blocksize;
 460
 461	BUG_ON(dest->bu_blocks != src->bu_blocks);
 462	BUG_ON(dest->bu_inode != src->bu_inode);
 463
 464	for (i = 0; i < src->bu_blocks; i++) {
 465		memcpy(bucket_block(dest, i), bucket_block(src, i),
 466		       blocksize);
 467	}
 468}
 469
 470static int ocfs2_validate_xattr_block(struct super_block *sb,
 471				      struct buffer_head *bh)
 472{
 473	int rc;
 474	struct ocfs2_xattr_block *xb =
 475		(struct ocfs2_xattr_block *)bh->b_data;
 476
 477	trace_ocfs2_validate_xattr_block((unsigned long long)bh->b_blocknr);
 478
 479	BUG_ON(!buffer_uptodate(bh));
 480
 481	/*
 482	 * If the ecc fails, we return the error but otherwise
 483	 * leave the filesystem running.  We know any error is
 484	 * local to this block.
 485	 */
 486	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &xb->xb_check);
 487	if (rc)
 488		return rc;
 489
 490	/*
 491	 * Errors after here are fatal
 492	 */
 493
 494	if (!OCFS2_IS_VALID_XATTR_BLOCK(xb)) {
 495		ocfs2_error(sb,
 496			    "Extended attribute block #%llu has bad "
 497			    "signature %.*s",
 498			    (unsigned long long)bh->b_blocknr, 7,
 499			    xb->xb_signature);
 500		return -EINVAL;
 501	}
 502
 503	if (le64_to_cpu(xb->xb_blkno) != bh->b_blocknr) {
 504		ocfs2_error(sb,
 505			    "Extended attribute block #%llu has an "
 506			    "invalid xb_blkno of %llu",
 507			    (unsigned long long)bh->b_blocknr,
 508			    (unsigned long long)le64_to_cpu(xb->xb_blkno));
 509		return -EINVAL;
 510	}
 511
 512	if (le32_to_cpu(xb->xb_fs_generation) != OCFS2_SB(sb)->fs_generation) {
 513		ocfs2_error(sb,
 514			    "Extended attribute block #%llu has an invalid "
 515			    "xb_fs_generation of #%u",
 516			    (unsigned long long)bh->b_blocknr,
 517			    le32_to_cpu(xb->xb_fs_generation));
 518		return -EINVAL;
 519	}
 520
 521	return 0;
 522}
 523
 524static int ocfs2_read_xattr_block(struct inode *inode, u64 xb_blkno,
 525				  struct buffer_head **bh)
 526{
 527	int rc;
 528	struct buffer_head *tmp = *bh;
 529
 530	rc = ocfs2_read_block(INODE_CACHE(inode), xb_blkno, &tmp,
 531			      ocfs2_validate_xattr_block);
 532
 533	/* If ocfs2_read_block() got us a new bh, pass it up. */
 534	if (!rc && !*bh)
 535		*bh = tmp;
 536
 537	return rc;
 538}
 539
 540static inline const char *ocfs2_xattr_prefix(int name_index)
 541{
 542	const struct xattr_handler *handler = NULL;
 543
 544	if (name_index > 0 && name_index < OCFS2_XATTR_MAX)
 545		handler = ocfs2_xattr_handler_map[name_index];
 546
 547	return handler ? handler->prefix : NULL;
 548}
 549
 550static u32 ocfs2_xattr_name_hash(struct inode *inode,
 551				 const char *name,
 552				 int name_len)
 553{
 554	/* Get hash value of uuid from super block */
 555	u32 hash = OCFS2_SB(inode->i_sb)->uuid_hash;
 556	int i;
 557
 558	/* hash extended attribute name */
 559	for (i = 0; i < name_len; i++) {
 560		hash = (hash << OCFS2_HASH_SHIFT) ^
 561		       (hash >> (8*sizeof(hash) - OCFS2_HASH_SHIFT)) ^
 562		       *name++;
 563	}
 564
 565	return hash;
 566}
 567
 568static int ocfs2_xattr_entry_real_size(int name_len, size_t value_len)
 569{
 570	return namevalue_size(name_len, value_len) +
 571		sizeof(struct ocfs2_xattr_entry);
 572}
 573
 574static int ocfs2_xi_entry_usage(struct ocfs2_xattr_info *xi)
 575{
 576	return namevalue_size_xi(xi) +
 577		sizeof(struct ocfs2_xattr_entry);
 578}
 579
 580static int ocfs2_xe_entry_usage(struct ocfs2_xattr_entry *xe)
 581{
 582	return namevalue_size_xe(xe) +
 583		sizeof(struct ocfs2_xattr_entry);
 584}
 585
 586int ocfs2_calc_security_init(struct inode *dir,
 587			     struct ocfs2_security_xattr_info *si,
 588			     int *want_clusters,
 589			     int *xattr_credits,
 590			     struct ocfs2_alloc_context **xattr_ac)
 591{
 592	int ret = 0;
 593	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 594	int s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 595						 si->value_len);
 596
 597	/*
 598	 * The max space of security xattr taken inline is
 599	 * 256(name) + 80(value) + 16(entry) = 352 bytes,
 600	 * So reserve one metadata block for it is ok.
 601	 */
 602	if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 603	    s_size > OCFS2_XATTR_FREE_IN_IBODY) {
 604		ret = ocfs2_reserve_new_metadata_blocks(osb, 1, xattr_ac);
 605		if (ret) {
 606			mlog_errno(ret);
 607			return ret;
 608		}
 609		*xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 610	}
 611
 612	/* reserve clusters for xattr value which will be set in B tree*/
 613	if (si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 614		int new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 615							    si->value_len);
 616
 617		*xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 618							   new_clusters);
 619		*want_clusters += new_clusters;
 620	}
 621	return ret;
 622}
 623
 624int ocfs2_calc_xattr_init(struct inode *dir,
 625			  struct buffer_head *dir_bh,
 626			  umode_t mode,
 627			  struct ocfs2_security_xattr_info *si,
 628			  int *want_clusters,
 629			  int *xattr_credits,
 630			  int *want_meta)
 631{
 632	int ret = 0;
 633	struct ocfs2_super *osb = OCFS2_SB(dir->i_sb);
 634	int s_size = 0, a_size = 0, acl_len = 0, new_clusters;
 635
 636	if (si->enable)
 637		s_size = ocfs2_xattr_entry_real_size(strlen(si->name),
 638						     si->value_len);
 639
 640	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL) {
 
 641		acl_len = ocfs2_xattr_get_nolock(dir, dir_bh,
 642					OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT,
 643					"", NULL, 0);
 
 644		if (acl_len > 0) {
 645			a_size = ocfs2_xattr_entry_real_size(0, acl_len);
 646			if (S_ISDIR(mode))
 647				a_size <<= 1;
 648		} else if (acl_len != 0 && acl_len != -ENODATA) {
 
 649			mlog_errno(ret);
 650			return ret;
 651		}
 652	}
 653
 654	if (!(s_size + a_size))
 655		return ret;
 656
 657	/*
 658	 * The max space of security xattr taken inline is
 659	 * 256(name) + 80(value) + 16(entry) = 352 bytes,
 660	 * The max space of acl xattr taken inline is
 661	 * 80(value) + 16(entry) * 2(if directory) = 192 bytes,
 662	 * when blocksize = 512, may reserve one more cluser for
 663	 * xattr bucket, otherwise reserve one metadata block
 664	 * for them is ok.
 665	 * If this is a new directory with inline data,
 666	 * we choose to reserve the entire inline area for
 667	 * directory contents and force an external xattr block.
 668	 */
 669	if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE ||
 670	    (S_ISDIR(mode) && ocfs2_supports_inline_data(osb)) ||
 671	    (s_size + a_size) > OCFS2_XATTR_FREE_IN_IBODY) {
 672		*want_meta = *want_meta + 1;
 673		*xattr_credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 674	}
 675
 676	if (dir->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE &&
 677	    (s_size + a_size) > OCFS2_XATTR_FREE_IN_BLOCK(dir)) {
 678		*want_clusters += 1;
 679		*xattr_credits += ocfs2_blocks_per_xattr_bucket(dir->i_sb);
 680	}
 681
 682	/*
 683	 * reserve credits and clusters for xattrs which has large value
 684	 * and have to be set outside
 685	 */
 686	if (si->enable && si->value_len > OCFS2_XATTR_INLINE_SIZE) {
 687		new_clusters = ocfs2_clusters_for_bytes(dir->i_sb,
 688							si->value_len);
 689		*xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 690							   new_clusters);
 691		*want_clusters += new_clusters;
 692	}
 693	if (osb->s_mount_opt & OCFS2_MOUNT_POSIX_ACL &&
 694	    acl_len > OCFS2_XATTR_INLINE_SIZE) {
 695		/* for directory, it has DEFAULT and ACCESS two types of acls */
 696		new_clusters = (S_ISDIR(mode) ? 2 : 1) *
 697				ocfs2_clusters_for_bytes(dir->i_sb, acl_len);
 698		*xattr_credits += ocfs2_clusters_to_blocks(dir->i_sb,
 699							   new_clusters);
 700		*want_clusters += new_clusters;
 701	}
 702
 703	return ret;
 704}
 705
 706static int ocfs2_xattr_extend_allocation(struct inode *inode,
 707					 u32 clusters_to_add,
 708					 struct ocfs2_xattr_value_buf *vb,
 709					 struct ocfs2_xattr_set_ctxt *ctxt)
 710{
 711	int status = 0, credits;
 712	handle_t *handle = ctxt->handle;
 713	enum ocfs2_alloc_restarted why;
 714	u32 prev_clusters, logical_start = le32_to_cpu(vb->vb_xv->xr_clusters);
 715	struct ocfs2_extent_tree et;
 716
 717	ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 718
 719	while (clusters_to_add) {
 720		trace_ocfs2_xattr_extend_allocation(clusters_to_add);
 721
 722		status = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 723				       OCFS2_JOURNAL_ACCESS_WRITE);
 724		if (status < 0) {
 725			mlog_errno(status);
 726			break;
 727		}
 728
 729		prev_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 730		status = ocfs2_add_clusters_in_btree(handle,
 731						     &et,
 732						     &logical_start,
 733						     clusters_to_add,
 734						     0,
 735						     ctxt->data_ac,
 736						     ctxt->meta_ac,
 737						     &why);
 738		if ((status < 0) && (status != -EAGAIN)) {
 739			if (status != -ENOSPC)
 740				mlog_errno(status);
 741			break;
 742		}
 743
 744		ocfs2_journal_dirty(handle, vb->vb_bh);
 745
 746		clusters_to_add -= le32_to_cpu(vb->vb_xv->xr_clusters) -
 747					 prev_clusters;
 748
 749		if (why != RESTART_NONE && clusters_to_add) {
 750			/*
 751			 * We can only fail in case the alloc file doesn't give
 752			 * up enough clusters.
 753			 */
 754			BUG_ON(why == RESTART_META);
 755
 756			credits = ocfs2_calc_extend_credits(inode->i_sb,
 757							    &vb->vb_xv->xr_list,
 758							    clusters_to_add);
 759			status = ocfs2_extend_trans(handle, credits);
 760			if (status < 0) {
 761				status = -ENOMEM;
 762				mlog_errno(status);
 763				break;
 764			}
 765		}
 766	}
 767
 768	return status;
 769}
 770
 771static int __ocfs2_remove_xattr_range(struct inode *inode,
 772				      struct ocfs2_xattr_value_buf *vb,
 773				      u32 cpos, u32 phys_cpos, u32 len,
 774				      unsigned int ext_flags,
 775				      struct ocfs2_xattr_set_ctxt *ctxt)
 776{
 777	int ret;
 778	u64 phys_blkno = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 779	handle_t *handle = ctxt->handle;
 780	struct ocfs2_extent_tree et;
 781
 782	ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
 783
 784	ret = vb->vb_access(handle, INODE_CACHE(inode), vb->vb_bh,
 785			    OCFS2_JOURNAL_ACCESS_WRITE);
 786	if (ret) {
 787		mlog_errno(ret);
 788		goto out;
 789	}
 790
 791	ret = ocfs2_remove_extent(handle, &et, cpos, len, ctxt->meta_ac,
 792				  &ctxt->dealloc);
 793	if (ret) {
 794		mlog_errno(ret);
 795		goto out;
 796	}
 797
 798	le32_add_cpu(&vb->vb_xv->xr_clusters, -len);
 799	ocfs2_journal_dirty(handle, vb->vb_bh);
 800
 801	if (ext_flags & OCFS2_EXT_REFCOUNTED)
 802		ret = ocfs2_decrease_refcount(inode, handle,
 803					ocfs2_blocks_to_clusters(inode->i_sb,
 804								 phys_blkno),
 805					len, ctxt->meta_ac, &ctxt->dealloc, 1);
 806	else
 807		ret = ocfs2_cache_cluster_dealloc(&ctxt->dealloc,
 808						  phys_blkno, len);
 809	if (ret)
 810		mlog_errno(ret);
 811
 812out:
 813	return ret;
 814}
 815
 816static int ocfs2_xattr_shrink_size(struct inode *inode,
 817				   u32 old_clusters,
 818				   u32 new_clusters,
 819				   struct ocfs2_xattr_value_buf *vb,
 820				   struct ocfs2_xattr_set_ctxt *ctxt)
 821{
 822	int ret = 0;
 823	unsigned int ext_flags;
 824	u32 trunc_len, cpos, phys_cpos, alloc_size;
 825	u64 block;
 826
 827	if (old_clusters <= new_clusters)
 828		return 0;
 829
 830	cpos = new_clusters;
 831	trunc_len = old_clusters - new_clusters;
 832	while (trunc_len) {
 833		ret = ocfs2_xattr_get_clusters(inode, cpos, &phys_cpos,
 834					       &alloc_size,
 835					       &vb->vb_xv->xr_list, &ext_flags);
 836		if (ret) {
 837			mlog_errno(ret);
 838			goto out;
 839		}
 840
 841		if (alloc_size > trunc_len)
 842			alloc_size = trunc_len;
 843
 844		ret = __ocfs2_remove_xattr_range(inode, vb, cpos,
 845						 phys_cpos, alloc_size,
 846						 ext_flags, ctxt);
 847		if (ret) {
 848			mlog_errno(ret);
 849			goto out;
 850		}
 851
 852		block = ocfs2_clusters_to_blocks(inode->i_sb, phys_cpos);
 853		ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode),
 854						       block, alloc_size);
 855		cpos += alloc_size;
 856		trunc_len -= alloc_size;
 857	}
 858
 859out:
 860	return ret;
 861}
 862
 863static int ocfs2_xattr_value_truncate(struct inode *inode,
 864				      struct ocfs2_xattr_value_buf *vb,
 865				      int len,
 866				      struct ocfs2_xattr_set_ctxt *ctxt)
 867{
 868	int ret;
 869	u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb, len);
 870	u32 old_clusters = le32_to_cpu(vb->vb_xv->xr_clusters);
 871
 872	if (new_clusters == old_clusters)
 873		return 0;
 874
 875	if (new_clusters > old_clusters)
 876		ret = ocfs2_xattr_extend_allocation(inode,
 877						    new_clusters - old_clusters,
 878						    vb, ctxt);
 879	else
 880		ret = ocfs2_xattr_shrink_size(inode,
 881					      old_clusters, new_clusters,
 882					      vb, ctxt);
 883
 884	return ret;
 885}
 886
 887static int ocfs2_xattr_list_entry(char *buffer, size_t size,
 888				  size_t *result, const char *prefix,
 
 889				  const char *name, int name_len)
 890{
 891	char *p = buffer + *result;
 892	int prefix_len = strlen(prefix);
 893	int total_len = prefix_len + name_len + 1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 894
 
 
 
 
 
 895	*result += total_len;
 896
 897	/* we are just looking for how big our buffer needs to be */
 898	if (!size)
 899		return 0;
 900
 901	if (*result > size)
 902		return -ERANGE;
 903
 904	memcpy(p, prefix, prefix_len);
 905	memcpy(p + prefix_len, name, name_len);
 906	p[prefix_len + name_len] = '\0';
 907
 908	return 0;
 909}
 910
 911static int ocfs2_xattr_list_entries(struct inode *inode,
 912				    struct ocfs2_xattr_header *header,
 913				    char *buffer, size_t buffer_size)
 914{
 915	size_t result = 0;
 916	int i, type, ret;
 917	const char *prefix, *name;
 918
 919	for (i = 0 ; i < le16_to_cpu(header->xh_count); i++) {
 920		struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
 921		type = ocfs2_xattr_get_type(entry);
 922		prefix = ocfs2_xattr_prefix(type);
 
 923
 924		if (prefix) {
 925			name = (const char *)header +
 926				le16_to_cpu(entry->xe_name_offset);
 927
 928			ret = ocfs2_xattr_list_entry(buffer, buffer_size,
 929						     &result, prefix, name,
 930						     entry->xe_name_len);
 931			if (ret)
 932				return ret;
 933		}
 934	}
 935
 936	return result;
 937}
 938
 939int ocfs2_has_inline_xattr_value_outside(struct inode *inode,
 940					 struct ocfs2_dinode *di)
 941{
 942	struct ocfs2_xattr_header *xh;
 943	int i;
 944
 945	xh = (struct ocfs2_xattr_header *)
 946		 ((void *)di + inode->i_sb->s_blocksize -
 947		 le16_to_cpu(di->i_xattr_inline_size));
 948
 949	for (i = 0; i < le16_to_cpu(xh->xh_count); i++)
 950		if (!ocfs2_xattr_is_local(&xh->xh_entries[i]))
 951			return 1;
 952
 953	return 0;
 954}
 955
 956static int ocfs2_xattr_ibody_list(struct inode *inode,
 957				  struct ocfs2_dinode *di,
 958				  char *buffer,
 959				  size_t buffer_size)
 960{
 961	struct ocfs2_xattr_header *header = NULL;
 962	struct ocfs2_inode_info *oi = OCFS2_I(inode);
 963	int ret = 0;
 964
 965	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
 966		return ret;
 967
 968	header = (struct ocfs2_xattr_header *)
 969		 ((void *)di + inode->i_sb->s_blocksize -
 970		 le16_to_cpu(di->i_xattr_inline_size));
 971
 972	ret = ocfs2_xattr_list_entries(inode, header, buffer, buffer_size);
 973
 974	return ret;
 975}
 976
 977static int ocfs2_xattr_block_list(struct inode *inode,
 978				  struct ocfs2_dinode *di,
 979				  char *buffer,
 980				  size_t buffer_size)
 981{
 982	struct buffer_head *blk_bh = NULL;
 983	struct ocfs2_xattr_block *xb;
 984	int ret = 0;
 985
 986	if (!di->i_xattr_loc)
 987		return ret;
 988
 989	ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
 990				     &blk_bh);
 991	if (ret < 0) {
 992		mlog_errno(ret);
 993		return ret;
 994	}
 995
 996	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
 997	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
 998		struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
 999		ret = ocfs2_xattr_list_entries(inode, header,
1000					       buffer, buffer_size);
1001	} else
1002		ret = ocfs2_xattr_tree_list_index_block(inode, blk_bh,
1003						   buffer, buffer_size);
1004
1005	brelse(blk_bh);
1006
1007	return ret;
1008}
1009
1010ssize_t ocfs2_listxattr(struct dentry *dentry,
1011			char *buffer,
1012			size_t size)
1013{
1014	int ret = 0, i_ret = 0, b_ret = 0;
1015	struct buffer_head *di_bh = NULL;
1016	struct ocfs2_dinode *di = NULL;
1017	struct ocfs2_inode_info *oi = OCFS2_I(dentry->d_inode);
1018
1019	if (!ocfs2_supports_xattr(OCFS2_SB(dentry->d_sb)))
1020		return -EOPNOTSUPP;
1021
1022	if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1023		return ret;
1024
1025	ret = ocfs2_inode_lock(dentry->d_inode, &di_bh, 0);
1026	if (ret < 0) {
1027		mlog_errno(ret);
1028		return ret;
1029	}
1030
1031	di = (struct ocfs2_dinode *)di_bh->b_data;
1032
1033	down_read(&oi->ip_xattr_sem);
1034	i_ret = ocfs2_xattr_ibody_list(dentry->d_inode, di, buffer, size);
1035	if (i_ret < 0)
1036		b_ret = 0;
1037	else {
1038		if (buffer) {
1039			buffer += i_ret;
1040			size -= i_ret;
1041		}
1042		b_ret = ocfs2_xattr_block_list(dentry->d_inode, di,
1043					       buffer, size);
1044		if (b_ret < 0)
1045			i_ret = 0;
1046	}
1047	up_read(&oi->ip_xattr_sem);
1048	ocfs2_inode_unlock(dentry->d_inode, 0);
1049
1050	brelse(di_bh);
1051
1052	return i_ret + b_ret;
1053}
1054
1055static int ocfs2_xattr_find_entry(int name_index,
1056				  const char *name,
1057				  struct ocfs2_xattr_search *xs)
1058{
1059	struct ocfs2_xattr_entry *entry;
1060	size_t name_len;
1061	int i, cmp = 1;
1062
1063	if (name == NULL)
1064		return -EINVAL;
1065
1066	name_len = strlen(name);
1067	entry = xs->here;
1068	for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
1069		cmp = name_index - ocfs2_xattr_get_type(entry);
1070		if (!cmp)
1071			cmp = name_len - entry->xe_name_len;
1072		if (!cmp)
1073			cmp = memcmp(name, (xs->base +
1074				     le16_to_cpu(entry->xe_name_offset)),
1075				     name_len);
1076		if (cmp == 0)
1077			break;
1078		entry += 1;
1079	}
1080	xs->here = entry;
1081
1082	return cmp ? -ENODATA : 0;
1083}
1084
1085static int ocfs2_xattr_get_value_outside(struct inode *inode,
1086					 struct ocfs2_xattr_value_root *xv,
1087					 void *buffer,
1088					 size_t len)
1089{
1090	u32 cpos, p_cluster, num_clusters, bpc, clusters;
1091	u64 blkno;
1092	int i, ret = 0;
1093	size_t cplen, blocksize;
1094	struct buffer_head *bh = NULL;
1095	struct ocfs2_extent_list *el;
1096
1097	el = &xv->xr_list;
1098	clusters = le32_to_cpu(xv->xr_clusters);
1099	bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1100	blocksize = inode->i_sb->s_blocksize;
1101
1102	cpos = 0;
1103	while (cpos < clusters) {
1104		ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1105					       &num_clusters, el, NULL);
1106		if (ret) {
1107			mlog_errno(ret);
1108			goto out;
1109		}
1110
1111		blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1112		/* Copy ocfs2_xattr_value */
1113		for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1114			ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1115					       &bh, NULL);
1116			if (ret) {
1117				mlog_errno(ret);
1118				goto out;
1119			}
1120
1121			cplen = len >= blocksize ? blocksize : len;
1122			memcpy(buffer, bh->b_data, cplen);
1123			len -= cplen;
1124			buffer += cplen;
1125
1126			brelse(bh);
1127			bh = NULL;
1128			if (len == 0)
1129				break;
1130		}
1131		cpos += num_clusters;
1132	}
1133out:
1134	return ret;
1135}
1136
1137static int ocfs2_xattr_ibody_get(struct inode *inode,
1138				 int name_index,
1139				 const char *name,
1140				 void *buffer,
1141				 size_t buffer_size,
1142				 struct ocfs2_xattr_search *xs)
1143{
1144	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1145	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
1146	struct ocfs2_xattr_value_root *xv;
1147	size_t size;
1148	int ret = 0;
1149
1150	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL))
1151		return -ENODATA;
1152
1153	xs->end = (void *)di + inode->i_sb->s_blocksize;
1154	xs->header = (struct ocfs2_xattr_header *)
1155			(xs->end - le16_to_cpu(di->i_xattr_inline_size));
1156	xs->base = (void *)xs->header;
1157	xs->here = xs->header->xh_entries;
1158
1159	ret = ocfs2_xattr_find_entry(name_index, name, xs);
1160	if (ret)
1161		return ret;
1162	size = le64_to_cpu(xs->here->xe_value_size);
1163	if (buffer) {
1164		if (size > buffer_size)
1165			return -ERANGE;
1166		if (ocfs2_xattr_is_local(xs->here)) {
1167			memcpy(buffer, (void *)xs->base +
1168			       le16_to_cpu(xs->here->xe_name_offset) +
1169			       OCFS2_XATTR_SIZE(xs->here->xe_name_len), size);
1170		} else {
1171			xv = (struct ocfs2_xattr_value_root *)
1172				(xs->base + le16_to_cpu(
1173				 xs->here->xe_name_offset) +
1174				OCFS2_XATTR_SIZE(xs->here->xe_name_len));
1175			ret = ocfs2_xattr_get_value_outside(inode, xv,
1176							    buffer, size);
1177			if (ret < 0) {
1178				mlog_errno(ret);
1179				return ret;
1180			}
1181		}
1182	}
1183
1184	return size;
1185}
1186
1187static int ocfs2_xattr_block_get(struct inode *inode,
1188				 int name_index,
1189				 const char *name,
1190				 void *buffer,
1191				 size_t buffer_size,
1192				 struct ocfs2_xattr_search *xs)
1193{
1194	struct ocfs2_xattr_block *xb;
1195	struct ocfs2_xattr_value_root *xv;
1196	size_t size;
1197	int ret = -ENODATA, name_offset, name_len, i;
1198	int uninitialized_var(block_off);
1199
1200	xs->bucket = ocfs2_xattr_bucket_new(inode);
1201	if (!xs->bucket) {
1202		ret = -ENOMEM;
1203		mlog_errno(ret);
1204		goto cleanup;
1205	}
1206
1207	ret = ocfs2_xattr_block_find(inode, name_index, name, xs);
1208	if (ret) {
1209		mlog_errno(ret);
1210		goto cleanup;
1211	}
1212
1213	if (xs->not_found) {
1214		ret = -ENODATA;
1215		goto cleanup;
1216	}
1217
1218	xb = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
1219	size = le64_to_cpu(xs->here->xe_value_size);
1220	if (buffer) {
1221		ret = -ERANGE;
1222		if (size > buffer_size)
1223			goto cleanup;
1224
1225		name_offset = le16_to_cpu(xs->here->xe_name_offset);
1226		name_len = OCFS2_XATTR_SIZE(xs->here->xe_name_len);
1227		i = xs->here - xs->header->xh_entries;
1228
1229		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
1230			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
1231								bucket_xh(xs->bucket),
1232								i,
1233								&block_off,
1234								&name_offset);
 
 
 
 
1235			xs->base = bucket_block(xs->bucket, block_off);
1236		}
1237		if (ocfs2_xattr_is_local(xs->here)) {
1238			memcpy(buffer, (void *)xs->base +
1239			       name_offset + name_len, size);
1240		} else {
1241			xv = (struct ocfs2_xattr_value_root *)
1242				(xs->base + name_offset + name_len);
1243			ret = ocfs2_xattr_get_value_outside(inode, xv,
1244							    buffer, size);
1245			if (ret < 0) {
1246				mlog_errno(ret);
1247				goto cleanup;
1248			}
1249		}
1250	}
1251	ret = size;
1252cleanup:
1253	ocfs2_xattr_bucket_free(xs->bucket);
1254
1255	brelse(xs->xattr_bh);
1256	xs->xattr_bh = NULL;
1257	return ret;
1258}
1259
1260int ocfs2_xattr_get_nolock(struct inode *inode,
1261			   struct buffer_head *di_bh,
1262			   int name_index,
1263			   const char *name,
1264			   void *buffer,
1265			   size_t buffer_size)
1266{
1267	int ret;
1268	struct ocfs2_dinode *di = NULL;
1269	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1270	struct ocfs2_xattr_search xis = {
1271		.not_found = -ENODATA,
1272	};
1273	struct ocfs2_xattr_search xbs = {
1274		.not_found = -ENODATA,
1275	};
1276
1277	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
1278		return -EOPNOTSUPP;
1279
1280	if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
1281		ret = -ENODATA;
1282
1283	xis.inode_bh = xbs.inode_bh = di_bh;
1284	di = (struct ocfs2_dinode *)di_bh->b_data;
1285
1286	ret = ocfs2_xattr_ibody_get(inode, name_index, name, buffer,
1287				    buffer_size, &xis);
1288	if (ret == -ENODATA && di->i_xattr_loc)
1289		ret = ocfs2_xattr_block_get(inode, name_index, name, buffer,
1290					    buffer_size, &xbs);
1291
1292	return ret;
1293}
1294
1295/* ocfs2_xattr_get()
1296 *
1297 * Copy an extended attribute into the buffer provided.
1298 * Buffer is NULL to compute the size of buffer required.
1299 */
1300static int ocfs2_xattr_get(struct inode *inode,
1301			   int name_index,
1302			   const char *name,
1303			   void *buffer,
1304			   size_t buffer_size)
1305{
1306	int ret;
1307	struct buffer_head *di_bh = NULL;
 
1308
1309	ret = ocfs2_inode_lock(inode, &di_bh, 0);
1310	if (ret < 0) {
1311		mlog_errno(ret);
1312		return ret;
1313	}
1314	down_read(&OCFS2_I(inode)->ip_xattr_sem);
1315	ret = ocfs2_xattr_get_nolock(inode, di_bh, name_index,
1316				     name, buffer, buffer_size);
1317	up_read(&OCFS2_I(inode)->ip_xattr_sem);
1318
1319	ocfs2_inode_unlock(inode, 0);
1320
1321	brelse(di_bh);
1322
1323	return ret;
1324}
1325
1326static int __ocfs2_xattr_set_value_outside(struct inode *inode,
1327					   handle_t *handle,
1328					   struct ocfs2_xattr_value_buf *vb,
1329					   const void *value,
1330					   int value_len)
1331{
1332	int ret = 0, i, cp_len;
1333	u16 blocksize = inode->i_sb->s_blocksize;
1334	u32 p_cluster, num_clusters;
1335	u32 cpos = 0, bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
1336	u32 clusters = ocfs2_clusters_for_bytes(inode->i_sb, value_len);
1337	u64 blkno;
1338	struct buffer_head *bh = NULL;
1339	unsigned int ext_flags;
1340	struct ocfs2_xattr_value_root *xv = vb->vb_xv;
1341
1342	BUG_ON(clusters > le32_to_cpu(xv->xr_clusters));
1343
1344	while (cpos < clusters) {
1345		ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
1346					       &num_clusters, &xv->xr_list,
1347					       &ext_flags);
1348		if (ret) {
1349			mlog_errno(ret);
1350			goto out;
1351		}
1352
1353		BUG_ON(ext_flags & OCFS2_EXT_REFCOUNTED);
1354
1355		blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
1356
1357		for (i = 0; i < num_clusters * bpc; i++, blkno++) {
1358			ret = ocfs2_read_block(INODE_CACHE(inode), blkno,
1359					       &bh, NULL);
1360			if (ret) {
1361				mlog_errno(ret);
1362				goto out;
1363			}
1364
1365			ret = ocfs2_journal_access(handle,
1366						   INODE_CACHE(inode),
1367						   bh,
1368						   OCFS2_JOURNAL_ACCESS_WRITE);
1369			if (ret < 0) {
1370				mlog_errno(ret);
1371				goto out;
1372			}
1373
1374			cp_len = value_len > blocksize ? blocksize : value_len;
1375			memcpy(bh->b_data, value, cp_len);
1376			value_len -= cp_len;
1377			value += cp_len;
1378			if (cp_len < blocksize)
1379				memset(bh->b_data + cp_len, 0,
1380				       blocksize - cp_len);
1381
1382			ocfs2_journal_dirty(handle, bh);
1383			brelse(bh);
1384			bh = NULL;
1385
1386			/*
1387			 * XXX: do we need to empty all the following
1388			 * blocks in this cluster?
1389			 */
1390			if (!value_len)
1391				break;
1392		}
1393		cpos += num_clusters;
1394	}
1395out:
1396	brelse(bh);
1397
1398	return ret;
1399}
1400
1401static int ocfs2_xa_check_space_helper(int needed_space, int free_start,
1402				       int num_entries)
1403{
1404	int free_space;
1405
1406	if (!needed_space)
1407		return 0;
1408
1409	free_space = free_start -
1410		sizeof(struct ocfs2_xattr_header) -
1411		(num_entries * sizeof(struct ocfs2_xattr_entry)) -
1412		OCFS2_XATTR_HEADER_GAP;
1413	if (free_space < 0)
1414		return -EIO;
1415	if (free_space < needed_space)
1416		return -ENOSPC;
1417
1418	return 0;
1419}
1420
1421static int ocfs2_xa_journal_access(handle_t *handle, struct ocfs2_xa_loc *loc,
1422				   int type)
1423{
1424	return loc->xl_ops->xlo_journal_access(handle, loc, type);
1425}
1426
1427static void ocfs2_xa_journal_dirty(handle_t *handle, struct ocfs2_xa_loc *loc)
1428{
1429	loc->xl_ops->xlo_journal_dirty(handle, loc);
1430}
1431
1432/* Give a pointer into the storage for the given offset */
1433static void *ocfs2_xa_offset_pointer(struct ocfs2_xa_loc *loc, int offset)
1434{
1435	BUG_ON(offset >= loc->xl_size);
1436	return loc->xl_ops->xlo_offset_pointer(loc, offset);
1437}
1438
1439/*
1440 * Wipe the name+value pair and allow the storage to reclaim it.  This
1441 * must be followed by either removal of the entry or a call to
1442 * ocfs2_xa_add_namevalue().
1443 */
1444static void ocfs2_xa_wipe_namevalue(struct ocfs2_xa_loc *loc)
1445{
1446	loc->xl_ops->xlo_wipe_namevalue(loc);
1447}
1448
1449/*
1450 * Find lowest offset to a name+value pair.  This is the start of our
1451 * downward-growing free space.
1452 */
1453static int ocfs2_xa_get_free_start(struct ocfs2_xa_loc *loc)
1454{
1455	return loc->xl_ops->xlo_get_free_start(loc);
1456}
1457
1458/* Can we reuse loc->xl_entry for xi? */
1459static int ocfs2_xa_can_reuse_entry(struct ocfs2_xa_loc *loc,
1460				    struct ocfs2_xattr_info *xi)
1461{
1462	return loc->xl_ops->xlo_can_reuse(loc, xi);
1463}
1464
1465/* How much free space is needed to set the new value */
1466static int ocfs2_xa_check_space(struct ocfs2_xa_loc *loc,
1467				struct ocfs2_xattr_info *xi)
1468{
1469	return loc->xl_ops->xlo_check_space(loc, xi);
1470}
1471
1472static void ocfs2_xa_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1473{
1474	loc->xl_ops->xlo_add_entry(loc, name_hash);
1475	loc->xl_entry->xe_name_hash = cpu_to_le32(name_hash);
1476	/*
1477	 * We can't leave the new entry's xe_name_offset at zero or
1478	 * add_namevalue() will go nuts.  We set it to the size of our
1479	 * storage so that it can never be less than any other entry.
1480	 */
1481	loc->xl_entry->xe_name_offset = cpu_to_le16(loc->xl_size);
1482}
1483
1484static void ocfs2_xa_add_namevalue(struct ocfs2_xa_loc *loc,
1485				   struct ocfs2_xattr_info *xi)
1486{
1487	int size = namevalue_size_xi(xi);
1488	int nameval_offset;
1489	char *nameval_buf;
1490
1491	loc->xl_ops->xlo_add_namevalue(loc, size);
1492	loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
1493	loc->xl_entry->xe_name_len = xi->xi_name_len;
1494	ocfs2_xattr_set_type(loc->xl_entry, xi->xi_name_index);
1495	ocfs2_xattr_set_local(loc->xl_entry,
1496			      xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE);
1497
1498	nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1499	nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
1500	memset(nameval_buf, 0, size);
1501	memcpy(nameval_buf, xi->xi_name, xi->xi_name_len);
1502}
1503
1504static void ocfs2_xa_fill_value_buf(struct ocfs2_xa_loc *loc,
1505				    struct ocfs2_xattr_value_buf *vb)
1506{
1507	int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1508	int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
1509
1510	/* Value bufs are for value trees */
1511	BUG_ON(ocfs2_xattr_is_local(loc->xl_entry));
1512	BUG_ON(namevalue_size_xe(loc->xl_entry) !=
1513	       (name_size + OCFS2_XATTR_ROOT_SIZE));
1514
1515	loc->xl_ops->xlo_fill_value_buf(loc, vb);
1516	vb->vb_xv =
1517		(struct ocfs2_xattr_value_root *)ocfs2_xa_offset_pointer(loc,
1518							nameval_offset +
1519							name_size);
1520}
1521
1522static int ocfs2_xa_block_journal_access(handle_t *handle,
1523					 struct ocfs2_xa_loc *loc, int type)
1524{
1525	struct buffer_head *bh = loc->xl_storage;
1526	ocfs2_journal_access_func access;
1527
1528	if (loc->xl_size == (bh->b_size -
1529			     offsetof(struct ocfs2_xattr_block,
1530				      xb_attrs.xb_header)))
1531		access = ocfs2_journal_access_xb;
1532	else
1533		access = ocfs2_journal_access_di;
1534	return access(handle, INODE_CACHE(loc->xl_inode), bh, type);
1535}
1536
1537static void ocfs2_xa_block_journal_dirty(handle_t *handle,
1538					 struct ocfs2_xa_loc *loc)
1539{
1540	struct buffer_head *bh = loc->xl_storage;
1541
1542	ocfs2_journal_dirty(handle, bh);
1543}
1544
1545static void *ocfs2_xa_block_offset_pointer(struct ocfs2_xa_loc *loc,
1546					   int offset)
1547{
1548	return (char *)loc->xl_header + offset;
1549}
1550
1551static int ocfs2_xa_block_can_reuse(struct ocfs2_xa_loc *loc,
1552				    struct ocfs2_xattr_info *xi)
1553{
1554	/*
1555	 * Block storage is strict.  If the sizes aren't exact, we will
1556	 * remove the old one and reinsert the new.
1557	 */
1558	return namevalue_size_xe(loc->xl_entry) ==
1559		namevalue_size_xi(xi);
1560}
1561
1562static int ocfs2_xa_block_get_free_start(struct ocfs2_xa_loc *loc)
1563{
1564	struct ocfs2_xattr_header *xh = loc->xl_header;
1565	int i, count = le16_to_cpu(xh->xh_count);
1566	int offset, free_start = loc->xl_size;
1567
1568	for (i = 0; i < count; i++) {
1569		offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1570		if (offset < free_start)
1571			free_start = offset;
1572	}
1573
1574	return free_start;
1575}
1576
1577static int ocfs2_xa_block_check_space(struct ocfs2_xa_loc *loc,
1578				      struct ocfs2_xattr_info *xi)
1579{
1580	int count = le16_to_cpu(loc->xl_header->xh_count);
1581	int free_start = ocfs2_xa_get_free_start(loc);
1582	int needed_space = ocfs2_xi_entry_usage(xi);
1583
1584	/*
1585	 * Block storage will reclaim the original entry before inserting
1586	 * the new value, so we only need the difference.  If the new
1587	 * entry is smaller than the old one, we don't need anything.
1588	 */
1589	if (loc->xl_entry) {
1590		/* Don't need space if we're reusing! */
1591		if (ocfs2_xa_can_reuse_entry(loc, xi))
1592			needed_space = 0;
1593		else
1594			needed_space -= ocfs2_xe_entry_usage(loc->xl_entry);
1595	}
1596	if (needed_space < 0)
1597		needed_space = 0;
1598	return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1599}
1600
1601/*
1602 * Block storage for xattrs keeps the name+value pairs compacted.  When
1603 * we remove one, we have to shift any that preceded it towards the end.
1604 */
1605static void ocfs2_xa_block_wipe_namevalue(struct ocfs2_xa_loc *loc)
1606{
1607	int i, offset;
1608	int namevalue_offset, first_namevalue_offset, namevalue_size;
1609	struct ocfs2_xattr_entry *entry = loc->xl_entry;
1610	struct ocfs2_xattr_header *xh = loc->xl_header;
1611	int count = le16_to_cpu(xh->xh_count);
1612
1613	namevalue_offset = le16_to_cpu(entry->xe_name_offset);
1614	namevalue_size = namevalue_size_xe(entry);
1615	first_namevalue_offset = ocfs2_xa_get_free_start(loc);
1616
1617	/* Shift the name+value pairs */
1618	memmove((char *)xh + first_namevalue_offset + namevalue_size,
1619		(char *)xh + first_namevalue_offset,
1620		namevalue_offset - first_namevalue_offset);
1621	memset((char *)xh + first_namevalue_offset, 0, namevalue_size);
1622
1623	/* Now tell xh->xh_entries about it */
1624	for (i = 0; i < count; i++) {
1625		offset = le16_to_cpu(xh->xh_entries[i].xe_name_offset);
1626		if (offset <= namevalue_offset)
1627			le16_add_cpu(&xh->xh_entries[i].xe_name_offset,
1628				     namevalue_size);
1629	}
1630
1631	/*
1632	 * Note that we don't update xh_free_start or xh_name_value_len
1633	 * because they're not used in block-stored xattrs.
1634	 */
1635}
1636
1637static void ocfs2_xa_block_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1638{
1639	int count = le16_to_cpu(loc->xl_header->xh_count);
1640	loc->xl_entry = &(loc->xl_header->xh_entries[count]);
1641	le16_add_cpu(&loc->xl_header->xh_count, 1);
1642	memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1643}
1644
1645static void ocfs2_xa_block_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1646{
1647	int free_start = ocfs2_xa_get_free_start(loc);
1648
1649	loc->xl_entry->xe_name_offset = cpu_to_le16(free_start - size);
1650}
1651
1652static void ocfs2_xa_block_fill_value_buf(struct ocfs2_xa_loc *loc,
1653					  struct ocfs2_xattr_value_buf *vb)
1654{
1655	struct buffer_head *bh = loc->xl_storage;
1656
1657	if (loc->xl_size == (bh->b_size -
1658			     offsetof(struct ocfs2_xattr_block,
1659				      xb_attrs.xb_header)))
1660		vb->vb_access = ocfs2_journal_access_xb;
1661	else
1662		vb->vb_access = ocfs2_journal_access_di;
1663	vb->vb_bh = bh;
1664}
1665
1666/*
1667 * Operations for xattrs stored in blocks.  This includes inline inode
1668 * storage and unindexed ocfs2_xattr_blocks.
1669 */
1670static const struct ocfs2_xa_loc_operations ocfs2_xa_block_loc_ops = {
1671	.xlo_journal_access	= ocfs2_xa_block_journal_access,
1672	.xlo_journal_dirty	= ocfs2_xa_block_journal_dirty,
1673	.xlo_offset_pointer	= ocfs2_xa_block_offset_pointer,
1674	.xlo_check_space	= ocfs2_xa_block_check_space,
1675	.xlo_can_reuse		= ocfs2_xa_block_can_reuse,
1676	.xlo_get_free_start	= ocfs2_xa_block_get_free_start,
1677	.xlo_wipe_namevalue	= ocfs2_xa_block_wipe_namevalue,
1678	.xlo_add_entry		= ocfs2_xa_block_add_entry,
1679	.xlo_add_namevalue	= ocfs2_xa_block_add_namevalue,
1680	.xlo_fill_value_buf	= ocfs2_xa_block_fill_value_buf,
1681};
1682
1683static int ocfs2_xa_bucket_journal_access(handle_t *handle,
1684					  struct ocfs2_xa_loc *loc, int type)
1685{
1686	struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1687
1688	return ocfs2_xattr_bucket_journal_access(handle, bucket, type);
1689}
1690
1691static void ocfs2_xa_bucket_journal_dirty(handle_t *handle,
1692					  struct ocfs2_xa_loc *loc)
1693{
1694	struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1695
1696	ocfs2_xattr_bucket_journal_dirty(handle, bucket);
1697}
1698
1699static void *ocfs2_xa_bucket_offset_pointer(struct ocfs2_xa_loc *loc,
1700					    int offset)
1701{
1702	struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1703	int block, block_offset;
1704
1705	/* The header is at the front of the bucket */
1706	block = offset >> loc->xl_inode->i_sb->s_blocksize_bits;
1707	block_offset = offset % loc->xl_inode->i_sb->s_blocksize;
1708
1709	return bucket_block(bucket, block) + block_offset;
1710}
1711
1712static int ocfs2_xa_bucket_can_reuse(struct ocfs2_xa_loc *loc,
1713				     struct ocfs2_xattr_info *xi)
1714{
1715	return namevalue_size_xe(loc->xl_entry) >=
1716		namevalue_size_xi(xi);
1717}
1718
1719static int ocfs2_xa_bucket_get_free_start(struct ocfs2_xa_loc *loc)
1720{
1721	struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1722	return le16_to_cpu(bucket_xh(bucket)->xh_free_start);
1723}
1724
1725static int ocfs2_bucket_align_free_start(struct super_block *sb,
1726					 int free_start, int size)
1727{
1728	/*
1729	 * We need to make sure that the name+value pair fits within
1730	 * one block.
1731	 */
1732	if (((free_start - size) >> sb->s_blocksize_bits) !=
1733	    ((free_start - 1) >> sb->s_blocksize_bits))
1734		free_start -= free_start % sb->s_blocksize;
1735
1736	return free_start;
1737}
1738
1739static int ocfs2_xa_bucket_check_space(struct ocfs2_xa_loc *loc,
1740				       struct ocfs2_xattr_info *xi)
1741{
1742	int rc;
1743	int count = le16_to_cpu(loc->xl_header->xh_count);
1744	int free_start = ocfs2_xa_get_free_start(loc);
1745	int needed_space = ocfs2_xi_entry_usage(xi);
1746	int size = namevalue_size_xi(xi);
1747	struct super_block *sb = loc->xl_inode->i_sb;
1748
1749	/*
1750	 * Bucket storage does not reclaim name+value pairs it cannot
1751	 * reuse.  They live as holes until the bucket fills, and then
1752	 * the bucket is defragmented.  However, the bucket can reclaim
1753	 * the ocfs2_xattr_entry.
1754	 */
1755	if (loc->xl_entry) {
1756		/* Don't need space if we're reusing! */
1757		if (ocfs2_xa_can_reuse_entry(loc, xi))
1758			needed_space = 0;
1759		else
1760			needed_space -= sizeof(struct ocfs2_xattr_entry);
1761	}
1762	BUG_ON(needed_space < 0);
1763
1764	if (free_start < size) {
1765		if (needed_space)
1766			return -ENOSPC;
1767	} else {
1768		/*
1769		 * First we check if it would fit in the first place.
1770		 * Below, we align the free start to a block.  This may
1771		 * slide us below the minimum gap.  By checking unaligned
1772		 * first, we avoid that error.
1773		 */
1774		rc = ocfs2_xa_check_space_helper(needed_space, free_start,
1775						 count);
1776		if (rc)
1777			return rc;
1778		free_start = ocfs2_bucket_align_free_start(sb, free_start,
1779							   size);
1780	}
1781	return ocfs2_xa_check_space_helper(needed_space, free_start, count);
1782}
1783
1784static void ocfs2_xa_bucket_wipe_namevalue(struct ocfs2_xa_loc *loc)
1785{
1786	le16_add_cpu(&loc->xl_header->xh_name_value_len,
1787		     -namevalue_size_xe(loc->xl_entry));
1788}
1789
1790static void ocfs2_xa_bucket_add_entry(struct ocfs2_xa_loc *loc, u32 name_hash)
1791{
1792	struct ocfs2_xattr_header *xh = loc->xl_header;
1793	int count = le16_to_cpu(xh->xh_count);
1794	int low = 0, high = count - 1, tmp;
1795	struct ocfs2_xattr_entry *tmp_xe;
1796
1797	/*
1798	 * We keep buckets sorted by name_hash, so we need to find
1799	 * our insert place.
1800	 */
1801	while (low <= high && count) {
1802		tmp = (low + high) / 2;
1803		tmp_xe = &xh->xh_entries[tmp];
1804
1805		if (name_hash > le32_to_cpu(tmp_xe->xe_name_hash))
1806			low = tmp + 1;
1807		else if (name_hash < le32_to_cpu(tmp_xe->xe_name_hash))
1808			high = tmp - 1;
1809		else {
1810			low = tmp;
1811			break;
1812		}
1813	}
1814
1815	if (low != count)
1816		memmove(&xh->xh_entries[low + 1],
1817			&xh->xh_entries[low],
1818			((count - low) * sizeof(struct ocfs2_xattr_entry)));
1819
1820	le16_add_cpu(&xh->xh_count, 1);
1821	loc->xl_entry = &xh->xh_entries[low];
1822	memset(loc->xl_entry, 0, sizeof(struct ocfs2_xattr_entry));
1823}
1824
1825static void ocfs2_xa_bucket_add_namevalue(struct ocfs2_xa_loc *loc, int size)
1826{
1827	int free_start = ocfs2_xa_get_free_start(loc);
1828	struct ocfs2_xattr_header *xh = loc->xl_header;
1829	struct super_block *sb = loc->xl_inode->i_sb;
1830	int nameval_offset;
1831
1832	free_start = ocfs2_bucket_align_free_start(sb, free_start, size);
1833	nameval_offset = free_start - size;
1834	loc->xl_entry->xe_name_offset = cpu_to_le16(nameval_offset);
1835	xh->xh_free_start = cpu_to_le16(nameval_offset);
1836	le16_add_cpu(&xh->xh_name_value_len, size);
1837
1838}
1839
1840static void ocfs2_xa_bucket_fill_value_buf(struct ocfs2_xa_loc *loc,
1841					   struct ocfs2_xattr_value_buf *vb)
1842{
1843	struct ocfs2_xattr_bucket *bucket = loc->xl_storage;
1844	struct super_block *sb = loc->xl_inode->i_sb;
1845	int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
1846	int size = namevalue_size_xe(loc->xl_entry);
1847	int block_offset = nameval_offset >> sb->s_blocksize_bits;
1848
1849	/* Values are not allowed to straddle block boundaries */
1850	BUG_ON(block_offset !=
1851	       ((nameval_offset + size - 1) >> sb->s_blocksize_bits));
1852	/* We expect the bucket to be filled in */
1853	BUG_ON(!bucket->bu_bhs[block_offset]);
1854
1855	vb->vb_access = ocfs2_journal_access;
1856	vb->vb_bh = bucket->bu_bhs[block_offset];
1857}
1858
1859/* Operations for xattrs stored in buckets. */
1860static const struct ocfs2_xa_loc_operations ocfs2_xa_bucket_loc_ops = {
1861	.xlo_journal_access	= ocfs2_xa_bucket_journal_access,
1862	.xlo_journal_dirty	= ocfs2_xa_bucket_journal_dirty,
1863	.xlo_offset_pointer	= ocfs2_xa_bucket_offset_pointer,
1864	.xlo_check_space	= ocfs2_xa_bucket_check_space,
1865	.xlo_can_reuse		= ocfs2_xa_bucket_can_reuse,
1866	.xlo_get_free_start	= ocfs2_xa_bucket_get_free_start,
1867	.xlo_wipe_namevalue	= ocfs2_xa_bucket_wipe_namevalue,
1868	.xlo_add_entry		= ocfs2_xa_bucket_add_entry,
1869	.xlo_add_namevalue	= ocfs2_xa_bucket_add_namevalue,
1870	.xlo_fill_value_buf	= ocfs2_xa_bucket_fill_value_buf,
1871};
1872
1873static unsigned int ocfs2_xa_value_clusters(struct ocfs2_xa_loc *loc)
1874{
1875	struct ocfs2_xattr_value_buf vb;
1876
1877	if (ocfs2_xattr_is_local(loc->xl_entry))
1878		return 0;
1879
1880	ocfs2_xa_fill_value_buf(loc, &vb);
1881	return le32_to_cpu(vb.vb_xv->xr_clusters);
1882}
1883
1884static int ocfs2_xa_value_truncate(struct ocfs2_xa_loc *loc, u64 bytes,
1885				   struct ocfs2_xattr_set_ctxt *ctxt)
1886{
1887	int trunc_rc, access_rc;
1888	struct ocfs2_xattr_value_buf vb;
1889
1890	ocfs2_xa_fill_value_buf(loc, &vb);
1891	trunc_rc = ocfs2_xattr_value_truncate(loc->xl_inode, &vb, bytes,
1892					      ctxt);
1893
1894	/*
1895	 * The caller of ocfs2_xa_value_truncate() has already called
1896	 * ocfs2_xa_journal_access on the loc.  However, The truncate code
1897	 * calls ocfs2_extend_trans().  This may commit the previous
1898	 * transaction and open a new one.  If this is a bucket, truncate
1899	 * could leave only vb->vb_bh set up for journaling.  Meanwhile,
1900	 * the caller is expecting to dirty the entire bucket.  So we must
1901	 * reset the journal work.  We do this even if truncate has failed,
1902	 * as it could have failed after committing the extend.
1903	 */
1904	access_rc = ocfs2_xa_journal_access(ctxt->handle, loc,
1905					    OCFS2_JOURNAL_ACCESS_WRITE);
1906
1907	/* Errors in truncate take precedence */
1908	return trunc_rc ? trunc_rc : access_rc;
1909}
1910
1911static void ocfs2_xa_remove_entry(struct ocfs2_xa_loc *loc)
1912{
1913	int index, count;
1914	struct ocfs2_xattr_header *xh = loc->xl_header;
1915	struct ocfs2_xattr_entry *entry = loc->xl_entry;
1916
1917	ocfs2_xa_wipe_namevalue(loc);
1918	loc->xl_entry = NULL;
1919
1920	le16_add_cpu(&xh->xh_count, -1);
1921	count = le16_to_cpu(xh->xh_count);
1922
1923	/*
1924	 * Only zero out the entry if there are more remaining.  This is
1925	 * important for an empty bucket, as it keeps track of the
1926	 * bucket's hash value.  It doesn't hurt empty block storage.
1927	 */
1928	if (count) {
1929		index = ((char *)entry - (char *)&xh->xh_entries) /
1930			sizeof(struct ocfs2_xattr_entry);
1931		memmove(&xh->xh_entries[index], &xh->xh_entries[index + 1],
1932			(count - index) * sizeof(struct ocfs2_xattr_entry));
1933		memset(&xh->xh_entries[count], 0,
1934		       sizeof(struct ocfs2_xattr_entry));
1935	}
1936}
1937
1938/*
1939 * If we have a problem adjusting the size of an external value during
1940 * ocfs2_xa_prepare_entry() or ocfs2_xa_remove(), we may have an xattr
1941 * in an intermediate state.  For example, the value may be partially
1942 * truncated.
1943 *
1944 * If the value tree hasn't changed, the extend/truncate went nowhere.
1945 * We have nothing to do.  The caller can treat it as a straight error.
1946 *
1947 * If the value tree got partially truncated, we now have a corrupted
1948 * extended attribute.  We're going to wipe its entry and leak the
1949 * clusters.  Better to leak some storage than leave a corrupt entry.
1950 *
1951 * If the value tree grew, it obviously didn't grow enough for the
1952 * new entry.  We're not going to try and reclaim those clusters either.
1953 * If there was already an external value there (orig_clusters != 0),
1954 * the new clusters are attached safely and we can just leave the old
1955 * value in place.  If there was no external value there, we remove
1956 * the entry.
1957 *
1958 * This way, the xattr block we store in the journal will be consistent.
1959 * If the size change broke because of the journal, no changes will hit
1960 * disk anyway.
1961 */
1962static void ocfs2_xa_cleanup_value_truncate(struct ocfs2_xa_loc *loc,
1963					    const char *what,
1964					    unsigned int orig_clusters)
1965{
1966	unsigned int new_clusters = ocfs2_xa_value_clusters(loc);
1967	char *nameval_buf = ocfs2_xa_offset_pointer(loc,
1968				le16_to_cpu(loc->xl_entry->xe_name_offset));
1969
1970	if (new_clusters < orig_clusters) {
1971		mlog(ML_ERROR,
1972		     "Partial truncate while %s xattr %.*s.  Leaking "
1973		     "%u clusters and removing the entry\n",
1974		     what, loc->xl_entry->xe_name_len, nameval_buf,
1975		     orig_clusters - new_clusters);
1976		ocfs2_xa_remove_entry(loc);
1977	} else if (!orig_clusters) {
1978		mlog(ML_ERROR,
1979		     "Unable to allocate an external value for xattr "
1980		     "%.*s safely.  Leaking %u clusters and removing the "
1981		     "entry\n",
1982		     loc->xl_entry->xe_name_len, nameval_buf,
1983		     new_clusters - orig_clusters);
1984		ocfs2_xa_remove_entry(loc);
1985	} else if (new_clusters > orig_clusters)
1986		mlog(ML_ERROR,
1987		     "Unable to grow xattr %.*s safely.  %u new clusters "
1988		     "have been added, but the value will not be "
1989		     "modified\n",
1990		     loc->xl_entry->xe_name_len, nameval_buf,
1991		     new_clusters - orig_clusters);
1992}
1993
1994static int ocfs2_xa_remove(struct ocfs2_xa_loc *loc,
1995			   struct ocfs2_xattr_set_ctxt *ctxt)
1996{
1997	int rc = 0;
1998	unsigned int orig_clusters;
1999
2000	if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2001		orig_clusters = ocfs2_xa_value_clusters(loc);
2002		rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2003		if (rc) {
2004			mlog_errno(rc);
2005			/*
2006			 * Since this is remove, we can return 0 if
2007			 * ocfs2_xa_cleanup_value_truncate() is going to
2008			 * wipe the entry anyway.  So we check the
2009			 * cluster count as well.
2010			 */
2011			if (orig_clusters != ocfs2_xa_value_clusters(loc))
2012				rc = 0;
2013			ocfs2_xa_cleanup_value_truncate(loc, "removing",
2014							orig_clusters);
2015			if (rc)
2016				goto out;
2017		}
2018	}
2019
2020	ocfs2_xa_remove_entry(loc);
2021
2022out:
2023	return rc;
2024}
2025
2026static void ocfs2_xa_install_value_root(struct ocfs2_xa_loc *loc)
2027{
2028	int name_size = OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len);
2029	char *nameval_buf;
2030
2031	nameval_buf = ocfs2_xa_offset_pointer(loc,
2032				le16_to_cpu(loc->xl_entry->xe_name_offset));
2033	memcpy(nameval_buf + name_size, &def_xv, OCFS2_XATTR_ROOT_SIZE);
2034}
2035
2036/*
2037 * Take an existing entry and make it ready for the new value.  This
2038 * won't allocate space, but it may free space.  It should be ready for
2039 * ocfs2_xa_prepare_entry() to finish the work.
2040 */
2041static int ocfs2_xa_reuse_entry(struct ocfs2_xa_loc *loc,
2042				struct ocfs2_xattr_info *xi,
2043				struct ocfs2_xattr_set_ctxt *ctxt)
2044{
2045	int rc = 0;
2046	int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2047	unsigned int orig_clusters;
2048	char *nameval_buf;
2049	int xe_local = ocfs2_xattr_is_local(loc->xl_entry);
2050	int xi_local = xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE;
2051
2052	BUG_ON(OCFS2_XATTR_SIZE(loc->xl_entry->xe_name_len) !=
2053	       name_size);
2054
2055	nameval_buf = ocfs2_xa_offset_pointer(loc,
2056				le16_to_cpu(loc->xl_entry->xe_name_offset));
2057	if (xe_local) {
2058		memset(nameval_buf + name_size, 0,
2059		       namevalue_size_xe(loc->xl_entry) - name_size);
2060		if (!xi_local)
2061			ocfs2_xa_install_value_root(loc);
2062	} else {
2063		orig_clusters = ocfs2_xa_value_clusters(loc);
2064		if (xi_local) {
2065			rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2066			if (rc < 0)
2067				mlog_errno(rc);
2068			else
2069				memset(nameval_buf + name_size, 0,
2070				       namevalue_size_xe(loc->xl_entry) -
2071				       name_size);
2072		} else if (le64_to_cpu(loc->xl_entry->xe_value_size) >
2073			   xi->xi_value_len) {
2074			rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len,
2075						     ctxt);
2076			if (rc < 0)
2077				mlog_errno(rc);
2078		}
2079
2080		if (rc) {
2081			ocfs2_xa_cleanup_value_truncate(loc, "reusing",
2082							orig_clusters);
2083			goto out;
2084		}
2085	}
2086
2087	loc->xl_entry->xe_value_size = cpu_to_le64(xi->xi_value_len);
2088	ocfs2_xattr_set_local(loc->xl_entry, xi_local);
2089
2090out:
2091	return rc;
2092}
2093
2094/*
2095 * Prepares loc->xl_entry to receive the new xattr.  This includes
2096 * properly setting up the name+value pair region.  If loc->xl_entry
2097 * already exists, it will take care of modifying it appropriately.
2098 *
2099 * Note that this modifies the data.  You did journal_access already,
2100 * right?
2101 */
2102static int ocfs2_xa_prepare_entry(struct ocfs2_xa_loc *loc,
2103				  struct ocfs2_xattr_info *xi,
2104				  u32 name_hash,
2105				  struct ocfs2_xattr_set_ctxt *ctxt)
2106{
2107	int rc = 0;
2108	unsigned int orig_clusters;
2109	__le64 orig_value_size = 0;
2110
2111	rc = ocfs2_xa_check_space(loc, xi);
2112	if (rc)
2113		goto out;
2114
2115	if (loc->xl_entry) {
2116		if (ocfs2_xa_can_reuse_entry(loc, xi)) {
2117			orig_value_size = loc->xl_entry->xe_value_size;
2118			rc = ocfs2_xa_reuse_entry(loc, xi, ctxt);
2119			if (rc)
2120				goto out;
2121			goto alloc_value;
2122		}
2123
2124		if (!ocfs2_xattr_is_local(loc->xl_entry)) {
2125			orig_clusters = ocfs2_xa_value_clusters(loc);
2126			rc = ocfs2_xa_value_truncate(loc, 0, ctxt);
2127			if (rc) {
2128				mlog_errno(rc);
2129				ocfs2_xa_cleanup_value_truncate(loc,
2130								"overwriting",
2131								orig_clusters);
2132				goto out;
2133			}
2134		}
2135		ocfs2_xa_wipe_namevalue(loc);
2136	} else
2137		ocfs2_xa_add_entry(loc, name_hash);
2138
2139	/*
2140	 * If we get here, we have a blank entry.  Fill it.  We grow our
2141	 * name+value pair back from the end.
2142	 */
2143	ocfs2_xa_add_namevalue(loc, xi);
2144	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
2145		ocfs2_xa_install_value_root(loc);
2146
2147alloc_value:
2148	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2149		orig_clusters = ocfs2_xa_value_clusters(loc);
2150		rc = ocfs2_xa_value_truncate(loc, xi->xi_value_len, ctxt);
2151		if (rc < 0) {
2152			ctxt->set_abort = 1;
2153			ocfs2_xa_cleanup_value_truncate(loc, "growing",
2154							orig_clusters);
2155			/*
2156			 * If we were growing an existing value,
2157			 * ocfs2_xa_cleanup_value_truncate() won't remove
2158			 * the entry. We need to restore the original value
2159			 * size.
2160			 */
2161			if (loc->xl_entry) {
2162				BUG_ON(!orig_value_size);
2163				loc->xl_entry->xe_value_size = orig_value_size;
2164			}
2165			mlog_errno(rc);
2166		}
2167	}
2168
2169out:
2170	return rc;
2171}
2172
2173/*
2174 * Store the value portion of the name+value pair.  This will skip
2175 * values that are stored externally.  Their tree roots were set up
2176 * by ocfs2_xa_prepare_entry().
2177 */
2178static int ocfs2_xa_store_value(struct ocfs2_xa_loc *loc,
2179				struct ocfs2_xattr_info *xi,
2180				struct ocfs2_xattr_set_ctxt *ctxt)
2181{
2182	int rc = 0;
2183	int nameval_offset = le16_to_cpu(loc->xl_entry->xe_name_offset);
2184	int name_size = OCFS2_XATTR_SIZE(xi->xi_name_len);
2185	char *nameval_buf;
2186	struct ocfs2_xattr_value_buf vb;
2187
2188	nameval_buf = ocfs2_xa_offset_pointer(loc, nameval_offset);
2189	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
2190		ocfs2_xa_fill_value_buf(loc, &vb);
2191		rc = __ocfs2_xattr_set_value_outside(loc->xl_inode,
2192						     ctxt->handle, &vb,
2193						     xi->xi_value,
2194						     xi->xi_value_len);
2195	} else
2196		memcpy(nameval_buf + name_size, xi->xi_value, xi->xi_value_len);
2197
2198	return rc;
2199}
2200
2201static int ocfs2_xa_set(struct ocfs2_xa_loc *loc,
2202			struct ocfs2_xattr_info *xi,
2203			struct ocfs2_xattr_set_ctxt *ctxt)
2204{
2205	int ret;
2206	u32 name_hash = ocfs2_xattr_name_hash(loc->xl_inode, xi->xi_name,
2207					      xi->xi_name_len);
2208
2209	ret = ocfs2_xa_journal_access(ctxt->handle, loc,
2210				      OCFS2_JOURNAL_ACCESS_WRITE);
2211	if (ret) {
2212		mlog_errno(ret);
2213		goto out;
2214	}
2215
2216	/*
2217	 * From here on out, everything is going to modify the buffer a
2218	 * little.  Errors are going to leave the xattr header in a
2219	 * sane state.  Thus, even with errors we dirty the sucker.
2220	 */
2221
2222	/* Don't worry, we are never called with !xi_value and !xl_entry */
2223	if (!xi->xi_value) {
2224		ret = ocfs2_xa_remove(loc, ctxt);
2225		goto out_dirty;
2226	}
2227
2228	ret = ocfs2_xa_prepare_entry(loc, xi, name_hash, ctxt);
2229	if (ret) {
2230		if (ret != -ENOSPC)
2231			mlog_errno(ret);
2232		goto out_dirty;
2233	}
2234
2235	ret = ocfs2_xa_store_value(loc, xi, ctxt);
2236	if (ret)
2237		mlog_errno(ret);
2238
2239out_dirty:
2240	ocfs2_xa_journal_dirty(ctxt->handle, loc);
2241
2242out:
2243	return ret;
2244}
2245
2246static void ocfs2_init_dinode_xa_loc(struct ocfs2_xa_loc *loc,
2247				     struct inode *inode,
2248				     struct buffer_head *bh,
2249				     struct ocfs2_xattr_entry *entry)
2250{
2251	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
2252
2253	BUG_ON(!(OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_XATTR_FL));
2254
2255	loc->xl_inode = inode;
2256	loc->xl_ops = &ocfs2_xa_block_loc_ops;
2257	loc->xl_storage = bh;
2258	loc->xl_entry = entry;
2259	loc->xl_size = le16_to_cpu(di->i_xattr_inline_size);
2260	loc->xl_header =
2261		(struct ocfs2_xattr_header *)(bh->b_data + bh->b_size -
2262					      loc->xl_size);
2263}
2264
2265static void ocfs2_init_xattr_block_xa_loc(struct ocfs2_xa_loc *loc,
2266					  struct inode *inode,
2267					  struct buffer_head *bh,
2268					  struct ocfs2_xattr_entry *entry)
2269{
2270	struct ocfs2_xattr_block *xb =
2271		(struct ocfs2_xattr_block *)bh->b_data;
2272
2273	BUG_ON(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED);
2274
2275	loc->xl_inode = inode;
2276	loc->xl_ops = &ocfs2_xa_block_loc_ops;
2277	loc->xl_storage = bh;
2278	loc->xl_header = &(xb->xb_attrs.xb_header);
2279	loc->xl_entry = entry;
2280	loc->xl_size = bh->b_size - offsetof(struct ocfs2_xattr_block,
2281					     xb_attrs.xb_header);
2282}
2283
2284static void ocfs2_init_xattr_bucket_xa_loc(struct ocfs2_xa_loc *loc,
2285					   struct ocfs2_xattr_bucket *bucket,
2286					   struct ocfs2_xattr_entry *entry)
2287{
2288	loc->xl_inode = bucket->bu_inode;
2289	loc->xl_ops = &ocfs2_xa_bucket_loc_ops;
2290	loc->xl_storage = bucket;
2291	loc->xl_header = bucket_xh(bucket);
2292	loc->xl_entry = entry;
2293	loc->xl_size = OCFS2_XATTR_BUCKET_SIZE;
2294}
2295
2296/*
2297 * In xattr remove, if it is stored outside and refcounted, we may have
2298 * the chance to split the refcount tree. So need the allocators.
2299 */
2300static int ocfs2_lock_xattr_remove_allocators(struct inode *inode,
2301					struct ocfs2_xattr_value_root *xv,
2302					struct ocfs2_caching_info *ref_ci,
2303					struct buffer_head *ref_root_bh,
2304					struct ocfs2_alloc_context **meta_ac,
2305					int *ref_credits)
2306{
2307	int ret, meta_add = 0;
2308	u32 p_cluster, num_clusters;
2309	unsigned int ext_flags;
2310
2311	*ref_credits = 0;
2312	ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
2313				       &num_clusters,
2314				       &xv->xr_list,
2315				       &ext_flags);
2316	if (ret) {
2317		mlog_errno(ret);
2318		goto out;
2319	}
2320
2321	if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
2322		goto out;
2323
2324	ret = ocfs2_refcounted_xattr_delete_need(inode, ref_ci,
2325						 ref_root_bh, xv,
2326						 &meta_add, ref_credits);
2327	if (ret) {
2328		mlog_errno(ret);
2329		goto out;
2330	}
2331
2332	ret = ocfs2_reserve_new_metadata_blocks(OCFS2_SB(inode->i_sb),
2333						meta_add, meta_ac);
2334	if (ret)
2335		mlog_errno(ret);
2336
2337out:
2338	return ret;
2339}
2340
2341static int ocfs2_remove_value_outside(struct inode*inode,
2342				      struct ocfs2_xattr_value_buf *vb,
2343				      struct ocfs2_xattr_header *header,
2344				      struct ocfs2_caching_info *ref_ci,
2345				      struct buffer_head *ref_root_bh)
2346{
2347	int ret = 0, i, ref_credits;
2348	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2349	struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
2350	void *val;
2351
2352	ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
2353
2354	for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
2355		struct ocfs2_xattr_entry *entry = &header->xh_entries[i];
2356
2357		if (ocfs2_xattr_is_local(entry))
2358			continue;
2359
2360		val = (void *)header +
2361			le16_to_cpu(entry->xe_name_offset);
2362		vb->vb_xv = (struct ocfs2_xattr_value_root *)
2363			(val + OCFS2_XATTR_SIZE(entry->xe_name_len));
2364
2365		ret = ocfs2_lock_xattr_remove_allocators(inode, vb->vb_xv,
2366							 ref_ci, ref_root_bh,
2367							 &ctxt.meta_ac,
2368							 &ref_credits);
2369
2370		ctxt.handle = ocfs2_start_trans(osb, ref_credits +
2371					ocfs2_remove_extent_credits(osb->sb));
2372		if (IS_ERR(ctxt.handle)) {
2373			ret = PTR_ERR(ctxt.handle);
2374			mlog_errno(ret);
2375			break;
2376		}
2377
2378		ret = ocfs2_xattr_value_truncate(inode, vb, 0, &ctxt);
2379
2380		ocfs2_commit_trans(osb, ctxt.handle);
2381		if (ctxt.meta_ac) {
2382			ocfs2_free_alloc_context(ctxt.meta_ac);
2383			ctxt.meta_ac = NULL;
2384		}
2385
2386		if (ret < 0) {
2387			mlog_errno(ret);
2388			break;
2389		}
2390
2391	}
2392
2393	if (ctxt.meta_ac)
2394		ocfs2_free_alloc_context(ctxt.meta_ac);
2395	ocfs2_schedule_truncate_log_flush(osb, 1);
2396	ocfs2_run_deallocs(osb, &ctxt.dealloc);
2397	return ret;
2398}
2399
2400static int ocfs2_xattr_ibody_remove(struct inode *inode,
2401				    struct buffer_head *di_bh,
2402				    struct ocfs2_caching_info *ref_ci,
2403				    struct buffer_head *ref_root_bh)
2404{
2405
2406	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2407	struct ocfs2_xattr_header *header;
2408	int ret;
2409	struct ocfs2_xattr_value_buf vb = {
2410		.vb_bh = di_bh,
2411		.vb_access = ocfs2_journal_access_di,
2412	};
2413
2414	header = (struct ocfs2_xattr_header *)
2415		 ((void *)di + inode->i_sb->s_blocksize -
2416		 le16_to_cpu(di->i_xattr_inline_size));
2417
2418	ret = ocfs2_remove_value_outside(inode, &vb, header,
2419					 ref_ci, ref_root_bh);
2420
2421	return ret;
2422}
2423
2424struct ocfs2_rm_xattr_bucket_para {
2425	struct ocfs2_caching_info *ref_ci;
2426	struct buffer_head *ref_root_bh;
2427};
2428
2429static int ocfs2_xattr_block_remove(struct inode *inode,
2430				    struct buffer_head *blk_bh,
2431				    struct ocfs2_caching_info *ref_ci,
2432				    struct buffer_head *ref_root_bh)
2433{
2434	struct ocfs2_xattr_block *xb;
2435	int ret = 0;
2436	struct ocfs2_xattr_value_buf vb = {
2437		.vb_bh = blk_bh,
2438		.vb_access = ocfs2_journal_access_xb,
2439	};
2440	struct ocfs2_rm_xattr_bucket_para args = {
2441		.ref_ci = ref_ci,
2442		.ref_root_bh = ref_root_bh,
2443	};
2444
2445	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2446	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2447		struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2448		ret = ocfs2_remove_value_outside(inode, &vb, header,
2449						 ref_ci, ref_root_bh);
2450	} else
2451		ret = ocfs2_iterate_xattr_index_block(inode,
2452						blk_bh,
2453						ocfs2_rm_xattr_cluster,
2454						&args);
2455
2456	return ret;
2457}
2458
2459static int ocfs2_xattr_free_block(struct inode *inode,
2460				  u64 block,
2461				  struct ocfs2_caching_info *ref_ci,
2462				  struct buffer_head *ref_root_bh)
2463{
2464	struct inode *xb_alloc_inode;
2465	struct buffer_head *xb_alloc_bh = NULL;
2466	struct buffer_head *blk_bh = NULL;
2467	struct ocfs2_xattr_block *xb;
2468	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2469	handle_t *handle;
2470	int ret = 0;
2471	u64 blk, bg_blkno;
2472	u16 bit;
2473
2474	ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2475	if (ret < 0) {
2476		mlog_errno(ret);
2477		goto out;
2478	}
2479
2480	ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2481	if (ret < 0) {
2482		mlog_errno(ret);
2483		goto out;
2484	}
2485
2486	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2487	blk = le64_to_cpu(xb->xb_blkno);
2488	bit = le16_to_cpu(xb->xb_suballoc_bit);
2489	if (xb->xb_suballoc_loc)
2490		bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2491	else
2492		bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2493
2494	xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2495				EXTENT_ALLOC_SYSTEM_INODE,
2496				le16_to_cpu(xb->xb_suballoc_slot));
2497	if (!xb_alloc_inode) {
2498		ret = -ENOMEM;
2499		mlog_errno(ret);
2500		goto out;
2501	}
2502	mutex_lock(&xb_alloc_inode->i_mutex);
2503
2504	ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2505	if (ret < 0) {
2506		mlog_errno(ret);
2507		goto out_mutex;
2508	}
2509
2510	handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2511	if (IS_ERR(handle)) {
2512		ret = PTR_ERR(handle);
2513		mlog_errno(ret);
2514		goto out_unlock;
2515	}
2516
2517	ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2518				       bit, bg_blkno, 1);
2519	if (ret < 0)
2520		mlog_errno(ret);
2521
2522	ocfs2_commit_trans(osb, handle);
2523out_unlock:
2524	ocfs2_inode_unlock(xb_alloc_inode, 1);
2525	brelse(xb_alloc_bh);
2526out_mutex:
2527	mutex_unlock(&xb_alloc_inode->i_mutex);
2528	iput(xb_alloc_inode);
2529out:
2530	brelse(blk_bh);
2531	return ret;
2532}
2533
2534/*
2535 * ocfs2_xattr_remove()
2536 *
2537 * Free extended attribute resources associated with this inode.
2538 */
2539int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2540{
2541	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2542	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2543	struct ocfs2_refcount_tree *ref_tree = NULL;
2544	struct buffer_head *ref_root_bh = NULL;
2545	struct ocfs2_caching_info *ref_ci = NULL;
2546	handle_t *handle;
2547	int ret;
2548
2549	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2550		return 0;
2551
2552	if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2553		return 0;
2554
2555	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2556		ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2557					       le64_to_cpu(di->i_refcount_loc),
2558					       1, &ref_tree, &ref_root_bh);
2559		if (ret) {
2560			mlog_errno(ret);
2561			goto out;
2562		}
2563		ref_ci = &ref_tree->rf_ci;
2564
2565	}
2566
2567	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2568		ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2569					       ref_ci, ref_root_bh);
2570		if (ret < 0) {
2571			mlog_errno(ret);
2572			goto out;
2573		}
2574	}
2575
2576	if (di->i_xattr_loc) {
2577		ret = ocfs2_xattr_free_block(inode,
2578					     le64_to_cpu(di->i_xattr_loc),
2579					     ref_ci, ref_root_bh);
2580		if (ret < 0) {
2581			mlog_errno(ret);
2582			goto out;
2583		}
2584	}
2585
2586	handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2587				   OCFS2_INODE_UPDATE_CREDITS);
2588	if (IS_ERR(handle)) {
2589		ret = PTR_ERR(handle);
2590		mlog_errno(ret);
2591		goto out;
2592	}
2593	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2594				      OCFS2_JOURNAL_ACCESS_WRITE);
2595	if (ret) {
2596		mlog_errno(ret);
2597		goto out_commit;
2598	}
2599
2600	di->i_xattr_loc = 0;
2601
2602	spin_lock(&oi->ip_lock);
2603	oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2604	di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2605	spin_unlock(&oi->ip_lock);
 
2606
2607	ocfs2_journal_dirty(handle, di_bh);
2608out_commit:
2609	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2610out:
2611	if (ref_tree)
2612		ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2613	brelse(ref_root_bh);
2614	return ret;
2615}
2616
2617static int ocfs2_xattr_has_space_inline(struct inode *inode,
2618					struct ocfs2_dinode *di)
2619{
2620	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2621	unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2622	int free;
2623
2624	if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2625		return 0;
2626
2627	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2628		struct ocfs2_inline_data *idata = &di->id2.i_data;
2629		free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2630	} else if (ocfs2_inode_is_fast_symlink(inode)) {
2631		free = ocfs2_fast_symlink_chars(inode->i_sb) -
2632			le64_to_cpu(di->i_size);
2633	} else {
2634		struct ocfs2_extent_list *el = &di->id2.i_list;
2635		free = (le16_to_cpu(el->l_count) -
2636			le16_to_cpu(el->l_next_free_rec)) *
2637			sizeof(struct ocfs2_extent_rec);
2638	}
2639	if (free >= xattrsize)
2640		return 1;
2641
2642	return 0;
2643}
2644
2645/*
2646 * ocfs2_xattr_ibody_find()
2647 *
2648 * Find extended attribute in inode block and
2649 * fill search info into struct ocfs2_xattr_search.
2650 */
2651static int ocfs2_xattr_ibody_find(struct inode *inode,
2652				  int name_index,
2653				  const char *name,
2654				  struct ocfs2_xattr_search *xs)
2655{
2656	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2657	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2658	int ret;
2659	int has_space = 0;
2660
2661	if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2662		return 0;
2663
2664	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2665		down_read(&oi->ip_alloc_sem);
2666		has_space = ocfs2_xattr_has_space_inline(inode, di);
2667		up_read(&oi->ip_alloc_sem);
2668		if (!has_space)
2669			return 0;
2670	}
2671
2672	xs->xattr_bh = xs->inode_bh;
2673	xs->end = (void *)di + inode->i_sb->s_blocksize;
2674	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2675		xs->header = (struct ocfs2_xattr_header *)
2676			(xs->end - le16_to_cpu(di->i_xattr_inline_size));
2677	else
2678		xs->header = (struct ocfs2_xattr_header *)
2679			(xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2680	xs->base = (void *)xs->header;
2681	xs->here = xs->header->xh_entries;
2682
2683	/* Find the named attribute. */
2684	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2685		ret = ocfs2_xattr_find_entry(name_index, name, xs);
2686		if (ret && ret != -ENODATA)
2687			return ret;
2688		xs->not_found = ret;
2689	}
2690
2691	return 0;
2692}
2693
2694static int ocfs2_xattr_ibody_init(struct inode *inode,
2695				  struct buffer_head *di_bh,
2696				  struct ocfs2_xattr_set_ctxt *ctxt)
2697{
2698	int ret;
2699	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2700	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2701	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2702	unsigned int xattrsize = osb->s_xattr_inline_size;
2703
2704	if (!ocfs2_xattr_has_space_inline(inode, di)) {
2705		ret = -ENOSPC;
2706		goto out;
2707	}
2708
2709	ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2710				      OCFS2_JOURNAL_ACCESS_WRITE);
2711	if (ret) {
2712		mlog_errno(ret);
2713		goto out;
2714	}
2715
2716	/*
2717	 * Adjust extent record count or inline data size
2718	 * to reserve space for extended attribute.
2719	 */
2720	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2721		struct ocfs2_inline_data *idata = &di->id2.i_data;
2722		le16_add_cpu(&idata->id_count, -xattrsize);
2723	} else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2724		struct ocfs2_extent_list *el = &di->id2.i_list;
2725		le16_add_cpu(&el->l_count, -(xattrsize /
2726					     sizeof(struct ocfs2_extent_rec)));
2727	}
2728	di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2729
2730	spin_lock(&oi->ip_lock);
2731	oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2732	di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2733	spin_unlock(&oi->ip_lock);
2734
2735	ocfs2_journal_dirty(ctxt->handle, di_bh);
2736
2737out:
2738	return ret;
2739}
2740
2741/*
2742 * ocfs2_xattr_ibody_set()
2743 *
2744 * Set, replace or remove an extended attribute into inode block.
2745 *
2746 */
2747static int ocfs2_xattr_ibody_set(struct inode *inode,
2748				 struct ocfs2_xattr_info *xi,
2749				 struct ocfs2_xattr_search *xs,
2750				 struct ocfs2_xattr_set_ctxt *ctxt)
2751{
2752	int ret;
2753	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2754	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2755	struct ocfs2_xa_loc loc;
2756
2757	if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2758		return -ENOSPC;
2759
2760	down_write(&oi->ip_alloc_sem);
2761	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2762		if (!ocfs2_xattr_has_space_inline(inode, di)) {
2763			ret = -ENOSPC;
2764			goto out;
2765		}
2766	}
2767
2768	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2769		ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2770		if (ret) {
2771			if (ret != -ENOSPC)
2772				mlog_errno(ret);
2773			goto out;
2774		}
2775	}
2776
2777	ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2778				 xs->not_found ? NULL : xs->here);
2779	ret = ocfs2_xa_set(&loc, xi, ctxt);
2780	if (ret) {
2781		if (ret != -ENOSPC)
2782			mlog_errno(ret);
2783		goto out;
2784	}
2785	xs->here = loc.xl_entry;
2786
2787out:
2788	up_write(&oi->ip_alloc_sem);
2789
2790	return ret;
2791}
2792
2793/*
2794 * ocfs2_xattr_block_find()
2795 *
2796 * Find extended attribute in external block and
2797 * fill search info into struct ocfs2_xattr_search.
2798 */
2799static int ocfs2_xattr_block_find(struct inode *inode,
2800				  int name_index,
2801				  const char *name,
2802				  struct ocfs2_xattr_search *xs)
2803{
2804	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2805	struct buffer_head *blk_bh = NULL;
2806	struct ocfs2_xattr_block *xb;
2807	int ret = 0;
2808
2809	if (!di->i_xattr_loc)
2810		return ret;
2811
2812	ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2813				     &blk_bh);
2814	if (ret < 0) {
2815		mlog_errno(ret);
2816		return ret;
2817	}
2818
2819	xs->xattr_bh = blk_bh;
2820	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2821
2822	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2823		xs->header = &xb->xb_attrs.xb_header;
2824		xs->base = (void *)xs->header;
2825		xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2826		xs->here = xs->header->xh_entries;
2827
2828		ret = ocfs2_xattr_find_entry(name_index, name, xs);
2829	} else
2830		ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2831						   name_index,
2832						   name, xs);
2833
2834	if (ret && ret != -ENODATA) {
2835		xs->xattr_bh = NULL;
2836		goto cleanup;
2837	}
2838	xs->not_found = ret;
2839	return 0;
2840cleanup:
2841	brelse(blk_bh);
2842
2843	return ret;
2844}
2845
2846static int ocfs2_create_xattr_block(struct inode *inode,
2847				    struct buffer_head *inode_bh,
2848				    struct ocfs2_xattr_set_ctxt *ctxt,
2849				    int indexed,
2850				    struct buffer_head **ret_bh)
2851{
2852	int ret;
2853	u16 suballoc_bit_start;
2854	u32 num_got;
2855	u64 suballoc_loc, first_blkno;
2856	struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2857	struct buffer_head *new_bh = NULL;
2858	struct ocfs2_xattr_block *xblk;
2859
2860	ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2861				      inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2862	if (ret < 0) {
2863		mlog_errno(ret);
2864		goto end;
2865	}
2866
2867	ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2868				   &suballoc_loc, &suballoc_bit_start,
2869				   &num_got, &first_blkno);
2870	if (ret < 0) {
2871		mlog_errno(ret);
2872		goto end;
2873	}
2874
2875	new_bh = sb_getblk(inode->i_sb, first_blkno);
 
 
 
 
 
 
2876	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2877
2878	ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2879				      new_bh,
2880				      OCFS2_JOURNAL_ACCESS_CREATE);
2881	if (ret < 0) {
2882		mlog_errno(ret);
2883		goto end;
2884	}
2885
2886	/* Initialize ocfs2_xattr_block */
2887	xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2888	memset(xblk, 0, inode->i_sb->s_blocksize);
2889	strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2890	xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2891	xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2892	xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2893	xblk->xb_fs_generation =
2894		cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2895	xblk->xb_blkno = cpu_to_le64(first_blkno);
2896	if (indexed) {
2897		struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2898		xr->xt_clusters = cpu_to_le32(1);
2899		xr->xt_last_eb_blk = 0;
2900		xr->xt_list.l_tree_depth = 0;
2901		xr->xt_list.l_count = cpu_to_le16(
2902					ocfs2_xattr_recs_per_xb(inode->i_sb));
2903		xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2904		xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2905	}
2906	ocfs2_journal_dirty(ctxt->handle, new_bh);
2907
2908	/* Add it to the inode */
2909	di->i_xattr_loc = cpu_to_le64(first_blkno);
2910
2911	spin_lock(&OCFS2_I(inode)->ip_lock);
2912	OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2913	di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2914	spin_unlock(&OCFS2_I(inode)->ip_lock);
2915
2916	ocfs2_journal_dirty(ctxt->handle, inode_bh);
2917
2918	*ret_bh = new_bh;
2919	new_bh = NULL;
2920
2921end:
2922	brelse(new_bh);
2923	return ret;
2924}
2925
2926/*
2927 * ocfs2_xattr_block_set()
2928 *
2929 * Set, replace or remove an extended attribute into external block.
2930 *
2931 */
2932static int ocfs2_xattr_block_set(struct inode *inode,
2933				 struct ocfs2_xattr_info *xi,
2934				 struct ocfs2_xattr_search *xs,
2935				 struct ocfs2_xattr_set_ctxt *ctxt)
2936{
2937	struct buffer_head *new_bh = NULL;
2938	struct ocfs2_xattr_block *xblk = NULL;
2939	int ret;
2940	struct ocfs2_xa_loc loc;
2941
2942	if (!xs->xattr_bh) {
2943		ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2944					       0, &new_bh);
2945		if (ret) {
2946			mlog_errno(ret);
2947			goto end;
2948		}
2949
2950		xs->xattr_bh = new_bh;
2951		xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2952		xs->header = &xblk->xb_attrs.xb_header;
2953		xs->base = (void *)xs->header;
2954		xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2955		xs->here = xs->header->xh_entries;
2956	} else
2957		xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2958
2959	if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2960		ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2961					      xs->not_found ? NULL : xs->here);
2962
2963		ret = ocfs2_xa_set(&loc, xi, ctxt);
2964		if (!ret)
2965			xs->here = loc.xl_entry;
2966		else if ((ret != -ENOSPC) || ctxt->set_abort)
2967			goto end;
2968		else {
2969			ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2970			if (ret)
2971				goto end;
2972		}
2973	}
2974
2975	if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2976		ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2977
2978end:
2979	return ret;
2980}
2981
2982/* Check whether the new xattr can be inserted into the inode. */
2983static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2984				       struct ocfs2_xattr_info *xi,
2985				       struct ocfs2_xattr_search *xs)
2986{
2987	struct ocfs2_xattr_entry *last;
2988	int free, i;
2989	size_t min_offs = xs->end - xs->base;
2990
2991	if (!xs->header)
2992		return 0;
2993
2994	last = xs->header->xh_entries;
2995
2996	for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2997		size_t offs = le16_to_cpu(last->xe_name_offset);
2998		if (offs < min_offs)
2999			min_offs = offs;
3000		last += 1;
3001	}
3002
3003	free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3004	if (free < 0)
3005		return 0;
3006
3007	BUG_ON(!xs->not_found);
3008
3009	if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3010		return 1;
3011
3012	return 0;
3013}
3014
3015static int ocfs2_calc_xattr_set_need(struct inode *inode,
3016				     struct ocfs2_dinode *di,
3017				     struct ocfs2_xattr_info *xi,
3018				     struct ocfs2_xattr_search *xis,
3019				     struct ocfs2_xattr_search *xbs,
3020				     int *clusters_need,
3021				     int *meta_need,
3022				     int *credits_need)
3023{
3024	int ret = 0, old_in_xb = 0;
3025	int clusters_add = 0, meta_add = 0, credits = 0;
3026	struct buffer_head *bh = NULL;
3027	struct ocfs2_xattr_block *xb = NULL;
3028	struct ocfs2_xattr_entry *xe = NULL;
3029	struct ocfs2_xattr_value_root *xv = NULL;
3030	char *base = NULL;
3031	int name_offset, name_len = 0;
3032	u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3033						    xi->xi_value_len);
3034	u64 value_size;
3035
3036	/*
3037	 * Calculate the clusters we need to write.
3038	 * No matter whether we replace an old one or add a new one,
3039	 * we need this for writing.
3040	 */
3041	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3042		credits += new_clusters *
3043			   ocfs2_clusters_to_blocks(inode->i_sb, 1);
3044
3045	if (xis->not_found && xbs->not_found) {
3046		credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3047
3048		if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3049			clusters_add += new_clusters;
3050			credits += ocfs2_calc_extend_credits(inode->i_sb,
3051							&def_xv.xv.xr_list,
3052							new_clusters);
3053		}
3054
3055		goto meta_guess;
3056	}
3057
3058	if (!xis->not_found) {
3059		xe = xis->here;
3060		name_offset = le16_to_cpu(xe->xe_name_offset);
3061		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3062		base = xis->base;
3063		credits += OCFS2_INODE_UPDATE_CREDITS;
3064	} else {
3065		int i, block_off = 0;
3066		xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3067		xe = xbs->here;
3068		name_offset = le16_to_cpu(xe->xe_name_offset);
3069		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3070		i = xbs->here - xbs->header->xh_entries;
3071		old_in_xb = 1;
3072
3073		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3074			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3075							bucket_xh(xbs->bucket),
3076							i, &block_off,
3077							&name_offset);
3078			base = bucket_block(xbs->bucket, block_off);
3079			credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3080		} else {
3081			base = xbs->base;
3082			credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3083		}
3084	}
3085
3086	/*
3087	 * delete a xattr doesn't need metadata and cluster allocation.
3088	 * so just calculate the credits and return.
3089	 *
3090	 * The credits for removing the value tree will be extended
3091	 * by ocfs2_remove_extent itself.
3092	 */
3093	if (!xi->xi_value) {
3094		if (!ocfs2_xattr_is_local(xe))
3095			credits += ocfs2_remove_extent_credits(inode->i_sb);
3096
3097		goto out;
3098	}
3099
3100	/* do cluster allocation guess first. */
3101	value_size = le64_to_cpu(xe->xe_value_size);
3102
3103	if (old_in_xb) {
3104		/*
3105		 * In xattr set, we always try to set the xe in inode first,
3106		 * so if it can be inserted into inode successfully, the old
3107		 * one will be removed from the xattr block, and this xattr
3108		 * will be inserted into inode as a new xattr in inode.
3109		 */
3110		if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3111			clusters_add += new_clusters;
3112			credits += ocfs2_remove_extent_credits(inode->i_sb) +
3113				    OCFS2_INODE_UPDATE_CREDITS;
3114			if (!ocfs2_xattr_is_local(xe))
3115				credits += ocfs2_calc_extend_credits(
3116							inode->i_sb,
3117							&def_xv.xv.xr_list,
3118							new_clusters);
3119			goto out;
3120		}
3121	}
3122
3123	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3124		/* the new values will be stored outside. */
3125		u32 old_clusters = 0;
3126
3127		if (!ocfs2_xattr_is_local(xe)) {
3128			old_clusters =	ocfs2_clusters_for_bytes(inode->i_sb,
3129								 value_size);
3130			xv = (struct ocfs2_xattr_value_root *)
3131			     (base + name_offset + name_len);
3132			value_size = OCFS2_XATTR_ROOT_SIZE;
3133		} else
3134			xv = &def_xv.xv;
3135
3136		if (old_clusters >= new_clusters) {
3137			credits += ocfs2_remove_extent_credits(inode->i_sb);
3138			goto out;
3139		} else {
3140			meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3141			clusters_add += new_clusters - old_clusters;
3142			credits += ocfs2_calc_extend_credits(inode->i_sb,
3143							     &xv->xr_list,
3144							     new_clusters -
3145							     old_clusters);
3146			if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3147				goto out;
3148		}
3149	} else {
3150		/*
3151		 * Now the new value will be stored inside. So if the new
3152		 * value is smaller than the size of value root or the old
3153		 * value, we don't need any allocation, otherwise we have
3154		 * to guess metadata allocation.
3155		 */
3156		if ((ocfs2_xattr_is_local(xe) &&
3157		     (value_size >= xi->xi_value_len)) ||
3158		    (!ocfs2_xattr_is_local(xe) &&
3159		     OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3160			goto out;
3161	}
3162
3163meta_guess:
3164	/* calculate metadata allocation. */
3165	if (di->i_xattr_loc) {
3166		if (!xbs->xattr_bh) {
3167			ret = ocfs2_read_xattr_block(inode,
3168						     le64_to_cpu(di->i_xattr_loc),
3169						     &bh);
3170			if (ret) {
3171				mlog_errno(ret);
3172				goto out;
3173			}
3174
3175			xb = (struct ocfs2_xattr_block *)bh->b_data;
3176		} else
3177			xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3178
3179		/*
3180		 * If there is already an xattr tree, good, we can calculate
3181		 * like other b-trees. Otherwise we may have the chance of
3182		 * create a tree, the credit calculation is borrowed from
3183		 * ocfs2_calc_extend_credits with root_el = NULL. And the
3184		 * new tree will be cluster based, so no meta is needed.
3185		 */
3186		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3187			struct ocfs2_extent_list *el =
3188				 &xb->xb_attrs.xb_root.xt_list;
3189			meta_add += ocfs2_extend_meta_needed(el);
3190			credits += ocfs2_calc_extend_credits(inode->i_sb,
3191							     el, 1);
3192		} else
3193			credits += OCFS2_SUBALLOC_ALLOC + 1;
3194
3195		/*
3196		 * This cluster will be used either for new bucket or for
3197		 * new xattr block.
3198		 * If the cluster size is the same as the bucket size, one
3199		 * more is needed since we may need to extend the bucket
3200		 * also.
3201		 */
3202		clusters_add += 1;
3203		credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3204		if (OCFS2_XATTR_BUCKET_SIZE ==
3205			OCFS2_SB(inode->i_sb)->s_clustersize) {
3206			credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3207			clusters_add += 1;
3208		}
3209	} else {
3210		meta_add += 1;
3211		credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 
 
 
 
 
 
 
 
3212	}
3213out:
3214	if (clusters_need)
3215		*clusters_need = clusters_add;
3216	if (meta_need)
3217		*meta_need = meta_add;
3218	if (credits_need)
3219		*credits_need = credits;
3220	brelse(bh);
3221	return ret;
3222}
3223
3224static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3225				     struct ocfs2_dinode *di,
3226				     struct ocfs2_xattr_info *xi,
3227				     struct ocfs2_xattr_search *xis,
3228				     struct ocfs2_xattr_search *xbs,
3229				     struct ocfs2_xattr_set_ctxt *ctxt,
3230				     int extra_meta,
3231				     int *credits)
3232{
3233	int clusters_add, meta_add, ret;
3234	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3235
3236	memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3237
3238	ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3239
3240	ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3241					&clusters_add, &meta_add, credits);
3242	if (ret) {
3243		mlog_errno(ret);
3244		return ret;
3245	}
3246
3247	meta_add += extra_meta;
3248	trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3249					clusters_add, *credits);
3250
3251	if (meta_add) {
3252		ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3253							&ctxt->meta_ac);
3254		if (ret) {
3255			mlog_errno(ret);
3256			goto out;
3257		}
3258	}
3259
3260	if (clusters_add) {
3261		ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3262		if (ret)
3263			mlog_errno(ret);
3264	}
3265out:
3266	if (ret) {
3267		if (ctxt->meta_ac) {
3268			ocfs2_free_alloc_context(ctxt->meta_ac);
3269			ctxt->meta_ac = NULL;
3270		}
3271
3272		/*
3273		 * We cannot have an error and a non null ctxt->data_ac.
3274		 */
3275	}
3276
3277	return ret;
3278}
3279
3280static int __ocfs2_xattr_set_handle(struct inode *inode,
3281				    struct ocfs2_dinode *di,
3282				    struct ocfs2_xattr_info *xi,
3283				    struct ocfs2_xattr_search *xis,
3284				    struct ocfs2_xattr_search *xbs,
3285				    struct ocfs2_xattr_set_ctxt *ctxt)
3286{
3287	int ret = 0, credits, old_found;
3288
3289	if (!xi->xi_value) {
3290		/* Remove existing extended attribute */
3291		if (!xis->not_found)
3292			ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3293		else if (!xbs->not_found)
3294			ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3295	} else {
3296		/* We always try to set extended attribute into inode first*/
3297		ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3298		if (!ret && !xbs->not_found) {
3299			/*
3300			 * If succeed and that extended attribute existing in
3301			 * external block, then we will remove it.
3302			 */
3303			xi->xi_value = NULL;
3304			xi->xi_value_len = 0;
3305
3306			old_found = xis->not_found;
3307			xis->not_found = -ENODATA;
3308			ret = ocfs2_calc_xattr_set_need(inode,
3309							di,
3310							xi,
3311							xis,
3312							xbs,
3313							NULL,
3314							NULL,
3315							&credits);
3316			xis->not_found = old_found;
3317			if (ret) {
3318				mlog_errno(ret);
3319				goto out;
3320			}
3321
3322			ret = ocfs2_extend_trans(ctxt->handle, credits);
3323			if (ret) {
3324				mlog_errno(ret);
3325				goto out;
3326			}
3327			ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3328		} else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3329			if (di->i_xattr_loc && !xbs->xattr_bh) {
3330				ret = ocfs2_xattr_block_find(inode,
3331							     xi->xi_name_index,
3332							     xi->xi_name, xbs);
3333				if (ret)
3334					goto out;
3335
3336				old_found = xis->not_found;
3337				xis->not_found = -ENODATA;
3338				ret = ocfs2_calc_xattr_set_need(inode,
3339								di,
3340								xi,
3341								xis,
3342								xbs,
3343								NULL,
3344								NULL,
3345								&credits);
3346				xis->not_found = old_found;
3347				if (ret) {
3348					mlog_errno(ret);
3349					goto out;
3350				}
3351
3352				ret = ocfs2_extend_trans(ctxt->handle, credits);
3353				if (ret) {
3354					mlog_errno(ret);
3355					goto out;
3356				}
3357			}
3358			/*
3359			 * If no space in inode, we will set extended attribute
3360			 * into external block.
3361			 */
3362			ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3363			if (ret)
3364				goto out;
3365			if (!xis->not_found) {
3366				/*
3367				 * If succeed and that extended attribute
3368				 * existing in inode, we will remove it.
3369				 */
3370				xi->xi_value = NULL;
3371				xi->xi_value_len = 0;
3372				xbs->not_found = -ENODATA;
3373				ret = ocfs2_calc_xattr_set_need(inode,
3374								di,
3375								xi,
3376								xis,
3377								xbs,
3378								NULL,
3379								NULL,
3380								&credits);
3381				if (ret) {
3382					mlog_errno(ret);
3383					goto out;
3384				}
3385
3386				ret = ocfs2_extend_trans(ctxt->handle, credits);
3387				if (ret) {
3388					mlog_errno(ret);
3389					goto out;
3390				}
3391				ret = ocfs2_xattr_ibody_set(inode, xi,
3392							    xis, ctxt);
3393			}
3394		}
3395	}
3396
3397	if (!ret) {
3398		/* Update inode ctime. */
3399		ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3400					      xis->inode_bh,
3401					      OCFS2_JOURNAL_ACCESS_WRITE);
3402		if (ret) {
3403			mlog_errno(ret);
3404			goto out;
3405		}
3406
3407		inode->i_ctime = CURRENT_TIME;
3408		di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3409		di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3410		ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3411	}
3412out:
3413	return ret;
3414}
3415
3416/*
3417 * This function only called duing creating inode
3418 * for init security/acl xattrs of the new inode.
3419 * All transanction credits have been reserved in mknod.
3420 */
3421int ocfs2_xattr_set_handle(handle_t *handle,
3422			   struct inode *inode,
3423			   struct buffer_head *di_bh,
3424			   int name_index,
3425			   const char *name,
3426			   const void *value,
3427			   size_t value_len,
3428			   int flags,
3429			   struct ocfs2_alloc_context *meta_ac,
3430			   struct ocfs2_alloc_context *data_ac)
3431{
3432	struct ocfs2_dinode *di;
3433	int ret;
3434
3435	struct ocfs2_xattr_info xi = {
3436		.xi_name_index = name_index,
3437		.xi_name = name,
3438		.xi_name_len = strlen(name),
3439		.xi_value = value,
3440		.xi_value_len = value_len,
3441	};
3442
3443	struct ocfs2_xattr_search xis = {
3444		.not_found = -ENODATA,
3445	};
3446
3447	struct ocfs2_xattr_search xbs = {
3448		.not_found = -ENODATA,
3449	};
3450
3451	struct ocfs2_xattr_set_ctxt ctxt = {
3452		.handle = handle,
3453		.meta_ac = meta_ac,
3454		.data_ac = data_ac,
3455	};
3456
3457	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3458		return -EOPNOTSUPP;
3459
3460	/*
3461	 * In extreme situation, may need xattr bucket when
3462	 * block size is too small. And we have already reserved
3463	 * the credits for bucket in mknod.
3464	 */
3465	if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3466		xbs.bucket = ocfs2_xattr_bucket_new(inode);
3467		if (!xbs.bucket) {
3468			mlog_errno(-ENOMEM);
3469			return -ENOMEM;
3470		}
3471	}
3472
3473	xis.inode_bh = xbs.inode_bh = di_bh;
3474	di = (struct ocfs2_dinode *)di_bh->b_data;
3475
3476	down_write(&OCFS2_I(inode)->ip_xattr_sem);
3477
3478	ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3479	if (ret)
3480		goto cleanup;
3481	if (xis.not_found) {
3482		ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3483		if (ret)
3484			goto cleanup;
3485	}
3486
3487	ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3488
3489cleanup:
3490	up_write(&OCFS2_I(inode)->ip_xattr_sem);
3491	brelse(xbs.xattr_bh);
3492	ocfs2_xattr_bucket_free(xbs.bucket);
3493
3494	return ret;
3495}
3496
3497/*
3498 * ocfs2_xattr_set()
3499 *
3500 * Set, replace or remove an extended attribute for this inode.
3501 * value is NULL to remove an existing extended attribute, else either
3502 * create or replace an extended attribute.
3503 */
3504int ocfs2_xattr_set(struct inode *inode,
3505		    int name_index,
3506		    const char *name,
3507		    const void *value,
3508		    size_t value_len,
3509		    int flags)
3510{
3511	struct buffer_head *di_bh = NULL;
3512	struct ocfs2_dinode *di;
3513	int ret, credits, ref_meta = 0, ref_credits = 0;
3514	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3515	struct inode *tl_inode = osb->osb_tl_inode;
3516	struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3517	struct ocfs2_refcount_tree *ref_tree = NULL;
 
3518
3519	struct ocfs2_xattr_info xi = {
3520		.xi_name_index = name_index,
3521		.xi_name = name,
3522		.xi_name_len = strlen(name),
3523		.xi_value = value,
3524		.xi_value_len = value_len,
3525	};
3526
3527	struct ocfs2_xattr_search xis = {
3528		.not_found = -ENODATA,
3529	};
3530
3531	struct ocfs2_xattr_search xbs = {
3532		.not_found = -ENODATA,
3533	};
3534
3535	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3536		return -EOPNOTSUPP;
3537
3538	/*
3539	 * Only xbs will be used on indexed trees.  xis doesn't need a
3540	 * bucket.
3541	 */
3542	xbs.bucket = ocfs2_xattr_bucket_new(inode);
3543	if (!xbs.bucket) {
3544		mlog_errno(-ENOMEM);
3545		return -ENOMEM;
3546	}
3547
3548	ret = ocfs2_inode_lock(inode, &di_bh, 1);
3549	if (ret < 0) {
 
3550		mlog_errno(ret);
3551		goto cleanup_nolock;
3552	}
3553	xis.inode_bh = xbs.inode_bh = di_bh;
3554	di = (struct ocfs2_dinode *)di_bh->b_data;
3555
3556	down_write(&OCFS2_I(inode)->ip_xattr_sem);
3557	/*
3558	 * Scan inode and external block to find the same name
3559	 * extended attribute and collect search information.
3560	 */
3561	ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3562	if (ret)
3563		goto cleanup;
3564	if (xis.not_found) {
3565		ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3566		if (ret)
3567			goto cleanup;
3568	}
3569
3570	if (xis.not_found && xbs.not_found) {
3571		ret = -ENODATA;
3572		if (flags & XATTR_REPLACE)
3573			goto cleanup;
3574		ret = 0;
3575		if (!value)
3576			goto cleanup;
3577	} else {
3578		ret = -EEXIST;
3579		if (flags & XATTR_CREATE)
3580			goto cleanup;
3581	}
3582
3583	/* Check whether the value is refcounted and do some preparation. */
3584	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3585	    (!xis.not_found || !xbs.not_found)) {
3586		ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3587						   &xis, &xbs, &ref_tree,
3588						   &ref_meta, &ref_credits);
3589		if (ret) {
3590			mlog_errno(ret);
3591			goto cleanup;
3592		}
3593	}
3594
3595	mutex_lock(&tl_inode->i_mutex);
3596
3597	if (ocfs2_truncate_log_needs_flush(osb)) {
3598		ret = __ocfs2_flush_truncate_log(osb);
3599		if (ret < 0) {
3600			mutex_unlock(&tl_inode->i_mutex);
3601			mlog_errno(ret);
3602			goto cleanup;
3603		}
3604	}
3605	mutex_unlock(&tl_inode->i_mutex);
3606
3607	ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3608					&xbs, &ctxt, ref_meta, &credits);
3609	if (ret) {
3610		mlog_errno(ret);
3611		goto cleanup;
3612	}
3613
3614	/* we need to update inode's ctime field, so add credit for it. */
3615	credits += OCFS2_INODE_UPDATE_CREDITS;
3616	ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3617	if (IS_ERR(ctxt.handle)) {
3618		ret = PTR_ERR(ctxt.handle);
3619		mlog_errno(ret);
3620		goto cleanup;
3621	}
3622
3623	ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
 
3624
3625	ocfs2_commit_trans(osb, ctxt.handle);
3626
 
3627	if (ctxt.data_ac)
3628		ocfs2_free_alloc_context(ctxt.data_ac);
3629	if (ctxt.meta_ac)
3630		ocfs2_free_alloc_context(ctxt.meta_ac);
3631	if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3632		ocfs2_schedule_truncate_log_flush(osb, 1);
3633	ocfs2_run_deallocs(osb, &ctxt.dealloc);
3634
3635cleanup:
3636	if (ref_tree)
3637		ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3638	up_write(&OCFS2_I(inode)->ip_xattr_sem);
3639	if (!value && !ret) {
3640		ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3641		if (ret)
3642			mlog_errno(ret);
3643	}
3644	ocfs2_inode_unlock(inode, 1);
3645cleanup_nolock:
3646	brelse(di_bh);
3647	brelse(xbs.xattr_bh);
3648	ocfs2_xattr_bucket_free(xbs.bucket);
3649
3650	return ret;
3651}
3652
3653/*
3654 * Find the xattr extent rec which may contains name_hash.
3655 * e_cpos will be the first name hash of the xattr rec.
3656 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3657 */
3658static int ocfs2_xattr_get_rec(struct inode *inode,
3659			       u32 name_hash,
3660			       u64 *p_blkno,
3661			       u32 *e_cpos,
3662			       u32 *num_clusters,
3663			       struct ocfs2_extent_list *el)
3664{
3665	int ret = 0, i;
3666	struct buffer_head *eb_bh = NULL;
3667	struct ocfs2_extent_block *eb;
3668	struct ocfs2_extent_rec *rec = NULL;
3669	u64 e_blkno = 0;
3670
3671	if (el->l_tree_depth) {
3672		ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3673				      &eb_bh);
3674		if (ret) {
3675			mlog_errno(ret);
3676			goto out;
3677		}
3678
3679		eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3680		el = &eb->h_list;
3681
3682		if (el->l_tree_depth) {
3683			ocfs2_error(inode->i_sb,
3684				    "Inode %lu has non zero tree depth in "
3685				    "xattr tree block %llu\n", inode->i_ino,
3686				    (unsigned long long)eb_bh->b_blocknr);
3687			ret = -EROFS;
3688			goto out;
3689		}
3690	}
3691
3692	for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3693		rec = &el->l_recs[i];
3694
3695		if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3696			e_blkno = le64_to_cpu(rec->e_blkno);
3697			break;
3698		}
3699	}
3700
3701	if (!e_blkno) {
3702		ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3703			    "record (%u, %u, 0) in xattr", inode->i_ino,
3704			    le32_to_cpu(rec->e_cpos),
3705			    ocfs2_rec_clusters(el, rec));
3706		ret = -EROFS;
3707		goto out;
3708	}
3709
3710	*p_blkno = le64_to_cpu(rec->e_blkno);
3711	*num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3712	if (e_cpos)
3713		*e_cpos = le32_to_cpu(rec->e_cpos);
3714out:
3715	brelse(eb_bh);
3716	return ret;
3717}
3718
3719typedef int (xattr_bucket_func)(struct inode *inode,
3720				struct ocfs2_xattr_bucket *bucket,
3721				void *para);
3722
3723static int ocfs2_find_xe_in_bucket(struct inode *inode,
3724				   struct ocfs2_xattr_bucket *bucket,
3725				   int name_index,
3726				   const char *name,
3727				   u32 name_hash,
3728				   u16 *xe_index,
3729				   int *found)
3730{
3731	int i, ret = 0, cmp = 1, block_off, new_offset;
3732	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3733	size_t name_len = strlen(name);
3734	struct ocfs2_xattr_entry *xe = NULL;
3735	char *xe_name;
3736
3737	/*
3738	 * We don't use binary search in the bucket because there
3739	 * may be multiple entries with the same name hash.
3740	 */
3741	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3742		xe = &xh->xh_entries[i];
3743
3744		if (name_hash > le32_to_cpu(xe->xe_name_hash))
3745			continue;
3746		else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3747			break;
3748
3749		cmp = name_index - ocfs2_xattr_get_type(xe);
3750		if (!cmp)
3751			cmp = name_len - xe->xe_name_len;
3752		if (cmp)
3753			continue;
3754
3755		ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3756							xh,
3757							i,
3758							&block_off,
3759							&new_offset);
3760		if (ret) {
3761			mlog_errno(ret);
3762			break;
3763		}
3764
3765
3766		xe_name = bucket_block(bucket, block_off) + new_offset;
3767		if (!memcmp(name, xe_name, name_len)) {
3768			*xe_index = i;
3769			*found = 1;
3770			ret = 0;
3771			break;
3772		}
3773	}
3774
3775	return ret;
3776}
3777
3778/*
3779 * Find the specified xattr entry in a series of buckets.
3780 * This series start from p_blkno and last for num_clusters.
3781 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3782 * the num of the valid buckets.
3783 *
3784 * Return the buffer_head this xattr should reside in. And if the xattr's
3785 * hash is in the gap of 2 buckets, return the lower bucket.
3786 */
3787static int ocfs2_xattr_bucket_find(struct inode *inode,
3788				   int name_index,
3789				   const char *name,
3790				   u32 name_hash,
3791				   u64 p_blkno,
3792				   u32 first_hash,
3793				   u32 num_clusters,
3794				   struct ocfs2_xattr_search *xs)
3795{
3796	int ret, found = 0;
3797	struct ocfs2_xattr_header *xh = NULL;
3798	struct ocfs2_xattr_entry *xe = NULL;
3799	u16 index = 0;
3800	u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3801	int low_bucket = 0, bucket, high_bucket;
3802	struct ocfs2_xattr_bucket *search;
3803	u32 last_hash;
3804	u64 blkno, lower_blkno = 0;
3805
3806	search = ocfs2_xattr_bucket_new(inode);
3807	if (!search) {
3808		ret = -ENOMEM;
3809		mlog_errno(ret);
3810		goto out;
3811	}
3812
3813	ret = ocfs2_read_xattr_bucket(search, p_blkno);
3814	if (ret) {
3815		mlog_errno(ret);
3816		goto out;
3817	}
3818
3819	xh = bucket_xh(search);
3820	high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3821	while (low_bucket <= high_bucket) {
3822		ocfs2_xattr_bucket_relse(search);
3823
3824		bucket = (low_bucket + high_bucket) / 2;
3825		blkno = p_blkno + bucket * blk_per_bucket;
3826		ret = ocfs2_read_xattr_bucket(search, blkno);
3827		if (ret) {
3828			mlog_errno(ret);
3829			goto out;
3830		}
3831
3832		xh = bucket_xh(search);
3833		xe = &xh->xh_entries[0];
3834		if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3835			high_bucket = bucket - 1;
3836			continue;
3837		}
3838
3839		/*
3840		 * Check whether the hash of the last entry in our
3841		 * bucket is larger than the search one. for an empty
3842		 * bucket, the last one is also the first one.
3843		 */
3844		if (xh->xh_count)
3845			xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3846
3847		last_hash = le32_to_cpu(xe->xe_name_hash);
3848
3849		/* record lower_blkno which may be the insert place. */
3850		lower_blkno = blkno;
3851
3852		if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3853			low_bucket = bucket + 1;
3854			continue;
3855		}
3856
3857		/* the searched xattr should reside in this bucket if exists. */
3858		ret = ocfs2_find_xe_in_bucket(inode, search,
3859					      name_index, name, name_hash,
3860					      &index, &found);
3861		if (ret) {
3862			mlog_errno(ret);
3863			goto out;
3864		}
3865		break;
3866	}
3867
3868	/*
3869	 * Record the bucket we have found.
3870	 * When the xattr's hash value is in the gap of 2 buckets, we will
3871	 * always set it to the previous bucket.
3872	 */
3873	if (!lower_blkno)
3874		lower_blkno = p_blkno;
3875
3876	/* This should be in cache - we just read it during the search */
3877	ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3878	if (ret) {
3879		mlog_errno(ret);
3880		goto out;
3881	}
3882
3883	xs->header = bucket_xh(xs->bucket);
3884	xs->base = bucket_block(xs->bucket, 0);
3885	xs->end = xs->base + inode->i_sb->s_blocksize;
3886
3887	if (found) {
3888		xs->here = &xs->header->xh_entries[index];
3889		trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3890			name, name_index, name_hash,
3891			(unsigned long long)bucket_blkno(xs->bucket),
3892			index);
3893	} else
3894		ret = -ENODATA;
3895
3896out:
3897	ocfs2_xattr_bucket_free(search);
3898	return ret;
3899}
3900
3901static int ocfs2_xattr_index_block_find(struct inode *inode,
3902					struct buffer_head *root_bh,
3903					int name_index,
3904					const char *name,
3905					struct ocfs2_xattr_search *xs)
3906{
3907	int ret;
3908	struct ocfs2_xattr_block *xb =
3909			(struct ocfs2_xattr_block *)root_bh->b_data;
3910	struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3911	struct ocfs2_extent_list *el = &xb_root->xt_list;
3912	u64 p_blkno = 0;
3913	u32 first_hash, num_clusters = 0;
3914	u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3915
3916	if (le16_to_cpu(el->l_next_free_rec) == 0)
3917		return -ENODATA;
3918
3919	trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3920					name, name_index, name_hash,
3921					(unsigned long long)root_bh->b_blocknr,
3922					-1);
3923
3924	ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3925				  &num_clusters, el);
3926	if (ret) {
3927		mlog_errno(ret);
3928		goto out;
3929	}
3930
3931	BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3932
3933	trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3934					name, name_index, first_hash,
3935					(unsigned long long)p_blkno,
3936					num_clusters);
3937
3938	ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3939				      p_blkno, first_hash, num_clusters, xs);
3940
3941out:
3942	return ret;
3943}
3944
3945static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3946				       u64 blkno,
3947				       u32 clusters,
3948				       xattr_bucket_func *func,
3949				       void *para)
3950{
3951	int i, ret = 0;
3952	u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3953	u32 num_buckets = clusters * bpc;
3954	struct ocfs2_xattr_bucket *bucket;
3955
3956	bucket = ocfs2_xattr_bucket_new(inode);
3957	if (!bucket) {
3958		mlog_errno(-ENOMEM);
3959		return -ENOMEM;
3960	}
3961
3962	trace_ocfs2_iterate_xattr_buckets(
3963		(unsigned long long)OCFS2_I(inode)->ip_blkno,
3964		(unsigned long long)blkno, clusters);
3965
3966	for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3967		ret = ocfs2_read_xattr_bucket(bucket, blkno);
3968		if (ret) {
3969			mlog_errno(ret);
3970			break;
3971		}
3972
3973		/*
3974		 * The real bucket num in this series of blocks is stored
3975		 * in the 1st bucket.
3976		 */
3977		if (i == 0)
3978			num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3979
3980		trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3981		     le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3982		if (func) {
3983			ret = func(inode, bucket, para);
3984			if (ret && ret != -ERANGE)
3985				mlog_errno(ret);
3986			/* Fall through to bucket_relse() */
3987		}
3988
3989		ocfs2_xattr_bucket_relse(bucket);
3990		if (ret)
3991			break;
3992	}
3993
3994	ocfs2_xattr_bucket_free(bucket);
3995	return ret;
3996}
3997
3998struct ocfs2_xattr_tree_list {
3999	char *buffer;
4000	size_t buffer_size;
4001	size_t result;
4002};
4003
4004static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4005					     struct ocfs2_xattr_header *xh,
4006					     int index,
4007					     int *block_off,
4008					     int *new_offset)
4009{
4010	u16 name_offset;
4011
4012	if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4013		return -EINVAL;
4014
4015	name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4016
4017	*block_off = name_offset >> sb->s_blocksize_bits;
4018	*new_offset = name_offset % sb->s_blocksize;
4019
4020	return 0;
4021}
4022
4023static int ocfs2_list_xattr_bucket(struct inode *inode,
4024				   struct ocfs2_xattr_bucket *bucket,
4025				   void *para)
4026{
4027	int ret = 0, type;
4028	struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4029	int i, block_off, new_offset;
4030	const char *prefix, *name;
4031
4032	for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4033		struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4034		type = ocfs2_xattr_get_type(entry);
4035		prefix = ocfs2_xattr_prefix(type);
4036
4037		if (prefix) {
4038			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4039								bucket_xh(bucket),
4040								i,
4041								&block_off,
4042								&new_offset);
4043			if (ret)
4044				break;
4045
4046			name = (const char *)bucket_block(bucket, block_off) +
4047				new_offset;
4048			ret = ocfs2_xattr_list_entry(xl->buffer,
4049						     xl->buffer_size,
4050						     &xl->result,
4051						     prefix, name,
4052						     entry->xe_name_len);
4053			if (ret)
4054				break;
4055		}
4056	}
4057
4058	return ret;
4059}
4060
4061static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4062					   struct buffer_head *blk_bh,
4063					   xattr_tree_rec_func *rec_func,
4064					   void *para)
4065{
4066	struct ocfs2_xattr_block *xb =
4067			(struct ocfs2_xattr_block *)blk_bh->b_data;
4068	struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4069	int ret = 0;
4070	u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4071	u64 p_blkno = 0;
4072
4073	if (!el->l_next_free_rec || !rec_func)
4074		return 0;
4075
4076	while (name_hash > 0) {
4077		ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4078					  &e_cpos, &num_clusters, el);
4079		if (ret) {
4080			mlog_errno(ret);
4081			break;
4082		}
4083
4084		ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4085			       num_clusters, para);
4086		if (ret) {
4087			if (ret != -ERANGE)
4088				mlog_errno(ret);
4089			break;
4090		}
4091
4092		if (e_cpos == 0)
4093			break;
4094
4095		name_hash = e_cpos - 1;
4096	}
4097
4098	return ret;
4099
4100}
4101
4102static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4103				     struct buffer_head *root_bh,
4104				     u64 blkno, u32 cpos, u32 len, void *para)
4105{
4106	return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4107					   ocfs2_list_xattr_bucket, para);
4108}
4109
4110static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4111					     struct buffer_head *blk_bh,
4112					     char *buffer,
4113					     size_t buffer_size)
4114{
4115	int ret;
4116	struct ocfs2_xattr_tree_list xl = {
4117		.buffer = buffer,
4118		.buffer_size = buffer_size,
4119		.result = 0,
4120	};
4121
4122	ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4123					      ocfs2_list_xattr_tree_rec, &xl);
4124	if (ret) {
4125		mlog_errno(ret);
4126		goto out;
4127	}
4128
4129	ret = xl.result;
4130out:
4131	return ret;
4132}
4133
4134static int cmp_xe(const void *a, const void *b)
4135{
4136	const struct ocfs2_xattr_entry *l = a, *r = b;
4137	u32 l_hash = le32_to_cpu(l->xe_name_hash);
4138	u32 r_hash = le32_to_cpu(r->xe_name_hash);
4139
4140	if (l_hash > r_hash)
4141		return 1;
4142	if (l_hash < r_hash)
4143		return -1;
4144	return 0;
4145}
4146
4147static void swap_xe(void *a, void *b, int size)
4148{
4149	struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4150
4151	tmp = *l;
4152	memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4153	memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4154}
4155
4156/*
4157 * When the ocfs2_xattr_block is filled up, new bucket will be created
4158 * and all the xattr entries will be moved to the new bucket.
4159 * The header goes at the start of the bucket, and the names+values are
4160 * filled from the end.  This is why *target starts as the last buffer.
4161 * Note: we need to sort the entries since they are not saved in order
4162 * in the ocfs2_xattr_block.
4163 */
4164static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4165					   struct buffer_head *xb_bh,
4166					   struct ocfs2_xattr_bucket *bucket)
4167{
4168	int i, blocksize = inode->i_sb->s_blocksize;
4169	int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4170	u16 offset, size, off_change;
4171	struct ocfs2_xattr_entry *xe;
4172	struct ocfs2_xattr_block *xb =
4173				(struct ocfs2_xattr_block *)xb_bh->b_data;
4174	struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4175	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4176	u16 count = le16_to_cpu(xb_xh->xh_count);
4177	char *src = xb_bh->b_data;
4178	char *target = bucket_block(bucket, blks - 1);
4179
4180	trace_ocfs2_cp_xattr_block_to_bucket_begin(
4181				(unsigned long long)xb_bh->b_blocknr,
4182				(unsigned long long)bucket_blkno(bucket));
4183
4184	for (i = 0; i < blks; i++)
4185		memset(bucket_block(bucket, i), 0, blocksize);
4186
4187	/*
4188	 * Since the xe_name_offset is based on ocfs2_xattr_header,
4189	 * there is a offset change corresponding to the change of
4190	 * ocfs2_xattr_header's position.
4191	 */
4192	off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4193	xe = &xb_xh->xh_entries[count - 1];
4194	offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4195	size = blocksize - offset;
4196
4197	/* copy all the names and values. */
4198	memcpy(target + offset, src + offset, size);
4199
4200	/* Init new header now. */
4201	xh->xh_count = xb_xh->xh_count;
4202	xh->xh_num_buckets = cpu_to_le16(1);
4203	xh->xh_name_value_len = cpu_to_le16(size);
4204	xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4205
4206	/* copy all the entries. */
4207	target = bucket_block(bucket, 0);
4208	offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4209	size = count * sizeof(struct ocfs2_xattr_entry);
4210	memcpy(target + offset, (char *)xb_xh + offset, size);
4211
4212	/* Change the xe offset for all the xe because of the move. */
4213	off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4214		 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4215	for (i = 0; i < count; i++)
4216		le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4217
4218	trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4219
4220	sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4221	     cmp_xe, swap_xe);
4222}
4223
4224/*
4225 * After we move xattr from block to index btree, we have to
4226 * update ocfs2_xattr_search to the new xe and base.
4227 *
4228 * When the entry is in xattr block, xattr_bh indicates the storage place.
4229 * While if the entry is in index b-tree, "bucket" indicates the
4230 * real place of the xattr.
4231 */
4232static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4233					    struct ocfs2_xattr_search *xs,
4234					    struct buffer_head *old_bh)
4235{
4236	char *buf = old_bh->b_data;
4237	struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4238	struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4239	int i;
4240
4241	xs->header = bucket_xh(xs->bucket);
4242	xs->base = bucket_block(xs->bucket, 0);
4243	xs->end = xs->base + inode->i_sb->s_blocksize;
4244
4245	if (xs->not_found)
4246		return;
4247
4248	i = xs->here - old_xh->xh_entries;
4249	xs->here = &xs->header->xh_entries[i];
4250}
4251
4252static int ocfs2_xattr_create_index_block(struct inode *inode,
4253					  struct ocfs2_xattr_search *xs,
4254					  struct ocfs2_xattr_set_ctxt *ctxt)
4255{
4256	int ret;
4257	u32 bit_off, len;
4258	u64 blkno;
4259	handle_t *handle = ctxt->handle;
4260	struct ocfs2_inode_info *oi = OCFS2_I(inode);
4261	struct buffer_head *xb_bh = xs->xattr_bh;
4262	struct ocfs2_xattr_block *xb =
4263			(struct ocfs2_xattr_block *)xb_bh->b_data;
4264	struct ocfs2_xattr_tree_root *xr;
4265	u16 xb_flags = le16_to_cpu(xb->xb_flags);
4266
4267	trace_ocfs2_xattr_create_index_block_begin(
4268				(unsigned long long)xb_bh->b_blocknr);
4269
4270	BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4271	BUG_ON(!xs->bucket);
4272
4273	/*
4274	 * XXX:
4275	 * We can use this lock for now, and maybe move to a dedicated mutex
4276	 * if performance becomes a problem later.
4277	 */
4278	down_write(&oi->ip_alloc_sem);
4279
4280	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4281				      OCFS2_JOURNAL_ACCESS_WRITE);
4282	if (ret) {
4283		mlog_errno(ret);
4284		goto out;
4285	}
4286
4287	ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4288				     1, 1, &bit_off, &len);
4289	if (ret) {
4290		mlog_errno(ret);
4291		goto out;
4292	}
4293
4294	/*
4295	 * The bucket may spread in many blocks, and
4296	 * we will only touch the 1st block and the last block
4297	 * in the whole bucket(one for entry and one for data).
4298	 */
4299	blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4300
4301	trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4302
4303	ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4304	if (ret) {
4305		mlog_errno(ret);
4306		goto out;
4307	}
4308
4309	ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4310						OCFS2_JOURNAL_ACCESS_CREATE);
4311	if (ret) {
4312		mlog_errno(ret);
4313		goto out;
4314	}
4315
4316	ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4317	ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4318
4319	ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4320
4321	/* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4322	memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4323	       offsetof(struct ocfs2_xattr_block, xb_attrs));
4324
4325	xr = &xb->xb_attrs.xb_root;
4326	xr->xt_clusters = cpu_to_le32(1);
4327	xr->xt_last_eb_blk = 0;
4328	xr->xt_list.l_tree_depth = 0;
4329	xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4330	xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4331
4332	xr->xt_list.l_recs[0].e_cpos = 0;
4333	xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4334	xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4335
4336	xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4337
4338	ocfs2_journal_dirty(handle, xb_bh);
4339
4340out:
4341	up_write(&oi->ip_alloc_sem);
4342
4343	return ret;
4344}
4345
4346static int cmp_xe_offset(const void *a, const void *b)
4347{
4348	const struct ocfs2_xattr_entry *l = a, *r = b;
4349	u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4350	u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4351
4352	if (l_name_offset < r_name_offset)
4353		return 1;
4354	if (l_name_offset > r_name_offset)
4355		return -1;
4356	return 0;
4357}
4358
4359/*
4360 * defrag a xattr bucket if we find that the bucket has some
4361 * holes beteen name/value pairs.
4362 * We will move all the name/value pairs to the end of the bucket
4363 * so that we can spare some space for insertion.
4364 */
4365static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4366				     handle_t *handle,
4367				     struct ocfs2_xattr_bucket *bucket)
4368{
4369	int ret, i;
4370	size_t end, offset, len;
4371	struct ocfs2_xattr_header *xh;
4372	char *entries, *buf, *bucket_buf = NULL;
4373	u64 blkno = bucket_blkno(bucket);
4374	u16 xh_free_start;
4375	size_t blocksize = inode->i_sb->s_blocksize;
4376	struct ocfs2_xattr_entry *xe;
4377
4378	/*
4379	 * In order to make the operation more efficient and generic,
4380	 * we copy all the blocks into a contiguous memory and do the
4381	 * defragment there, so if anything is error, we will not touch
4382	 * the real block.
4383	 */
4384	bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4385	if (!bucket_buf) {
4386		ret = -EIO;
4387		goto out;
4388	}
4389
4390	buf = bucket_buf;
4391	for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4392		memcpy(buf, bucket_block(bucket, i), blocksize);
4393
4394	ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4395						OCFS2_JOURNAL_ACCESS_WRITE);
4396	if (ret < 0) {
4397		mlog_errno(ret);
4398		goto out;
4399	}
4400
4401	xh = (struct ocfs2_xattr_header *)bucket_buf;
4402	entries = (char *)xh->xh_entries;
4403	xh_free_start = le16_to_cpu(xh->xh_free_start);
4404
4405	trace_ocfs2_defrag_xattr_bucket(
4406	     (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4407	     xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4408
4409	/*
4410	 * sort all the entries by their offset.
4411	 * the largest will be the first, so that we can
4412	 * move them to the end one by one.
4413	 */
4414	sort(entries, le16_to_cpu(xh->xh_count),
4415	     sizeof(struct ocfs2_xattr_entry),
4416	     cmp_xe_offset, swap_xe);
4417
4418	/* Move all name/values to the end of the bucket. */
4419	xe = xh->xh_entries;
4420	end = OCFS2_XATTR_BUCKET_SIZE;
4421	for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4422		offset = le16_to_cpu(xe->xe_name_offset);
4423		len = namevalue_size_xe(xe);
4424
4425		/*
4426		 * We must make sure that the name/value pair
4427		 * exist in the same block. So adjust end to
4428		 * the previous block end if needed.
4429		 */
4430		if (((end - len) / blocksize !=
4431			(end - 1) / blocksize))
4432			end = end - end % blocksize;
4433
4434		if (end > offset + len) {
4435			memmove(bucket_buf + end - len,
4436				bucket_buf + offset, len);
4437			xe->xe_name_offset = cpu_to_le16(end - len);
4438		}
4439
4440		mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4441				"bucket %llu\n", (unsigned long long)blkno);
4442
4443		end -= len;
4444	}
4445
4446	mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4447			"bucket %llu\n", (unsigned long long)blkno);
4448
4449	if (xh_free_start == end)
4450		goto out;
4451
4452	memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4453	xh->xh_free_start = cpu_to_le16(end);
4454
4455	/* sort the entries by their name_hash. */
4456	sort(entries, le16_to_cpu(xh->xh_count),
4457	     sizeof(struct ocfs2_xattr_entry),
4458	     cmp_xe, swap_xe);
4459
4460	buf = bucket_buf;
4461	for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4462		memcpy(bucket_block(bucket, i), buf, blocksize);
4463	ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4464
4465out:
4466	kfree(bucket_buf);
4467	return ret;
4468}
4469
4470/*
4471 * prev_blkno points to the start of an existing extent.  new_blkno
4472 * points to a newly allocated extent.  Because we know each of our
4473 * clusters contains more than bucket, we can easily split one cluster
4474 * at a bucket boundary.  So we take the last cluster of the existing
4475 * extent and split it down the middle.  We move the last half of the
4476 * buckets in the last cluster of the existing extent over to the new
4477 * extent.
4478 *
4479 * first_bh is the buffer at prev_blkno so we can update the existing
4480 * extent's bucket count.  header_bh is the bucket were we were hoping
4481 * to insert our xattr.  If the bucket move places the target in the new
4482 * extent, we'll update first_bh and header_bh after modifying the old
4483 * extent.
4484 *
4485 * first_hash will be set as the 1st xe's name_hash in the new extent.
4486 */
4487static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4488					       handle_t *handle,
4489					       struct ocfs2_xattr_bucket *first,
4490					       struct ocfs2_xattr_bucket *target,
4491					       u64 new_blkno,
4492					       u32 num_clusters,
4493					       u32 *first_hash)
4494{
4495	int ret;
4496	struct super_block *sb = inode->i_sb;
4497	int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4498	int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4499	int to_move = num_buckets / 2;
4500	u64 src_blkno;
4501	u64 last_cluster_blkno = bucket_blkno(first) +
4502		((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4503
4504	BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4505	BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4506
4507	trace_ocfs2_mv_xattr_bucket_cross_cluster(
4508				(unsigned long long)last_cluster_blkno,
4509				(unsigned long long)new_blkno);
4510
4511	ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4512				     last_cluster_blkno, new_blkno,
4513				     to_move, first_hash);
4514	if (ret) {
4515		mlog_errno(ret);
4516		goto out;
4517	}
4518
4519	/* This is the first bucket that got moved */
4520	src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4521
4522	/*
4523	 * If the target bucket was part of the moved buckets, we need to
4524	 * update first and target.
4525	 */
4526	if (bucket_blkno(target) >= src_blkno) {
4527		/* Find the block for the new target bucket */
4528		src_blkno = new_blkno +
4529			(bucket_blkno(target) - src_blkno);
4530
4531		ocfs2_xattr_bucket_relse(first);
4532		ocfs2_xattr_bucket_relse(target);
4533
4534		/*
4535		 * These shouldn't fail - the buffers are in the
4536		 * journal from ocfs2_cp_xattr_bucket().
4537		 */
4538		ret = ocfs2_read_xattr_bucket(first, new_blkno);
4539		if (ret) {
4540			mlog_errno(ret);
4541			goto out;
4542		}
4543		ret = ocfs2_read_xattr_bucket(target, src_blkno);
4544		if (ret)
4545			mlog_errno(ret);
4546
4547	}
4548
4549out:
4550	return ret;
4551}
4552
4553/*
4554 * Find the suitable pos when we divide a bucket into 2.
4555 * We have to make sure the xattrs with the same hash value exist
4556 * in the same bucket.
4557 *
4558 * If this ocfs2_xattr_header covers more than one hash value, find a
4559 * place where the hash value changes.  Try to find the most even split.
4560 * The most common case is that all entries have different hash values,
4561 * and the first check we make will find a place to split.
4562 */
4563static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4564{
4565	struct ocfs2_xattr_entry *entries = xh->xh_entries;
4566	int count = le16_to_cpu(xh->xh_count);
4567	int delta, middle = count / 2;
4568
4569	/*
4570	 * We start at the middle.  Each step gets farther away in both
4571	 * directions.  We therefore hit the change in hash value
4572	 * nearest to the middle.  Note that this loop does not execute for
4573	 * count < 2.
4574	 */
4575	for (delta = 0; delta < middle; delta++) {
4576		/* Let's check delta earlier than middle */
4577		if (cmp_xe(&entries[middle - delta - 1],
4578			   &entries[middle - delta]))
4579			return middle - delta;
4580
4581		/* For even counts, don't walk off the end */
4582		if ((middle + delta + 1) == count)
4583			continue;
4584
4585		/* Now try delta past middle */
4586		if (cmp_xe(&entries[middle + delta],
4587			   &entries[middle + delta + 1]))
4588			return middle + delta + 1;
4589	}
4590
4591	/* Every entry had the same hash */
4592	return count;
4593}
4594
4595/*
4596 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4597 * first_hash will record the 1st hash of the new bucket.
4598 *
4599 * Normally half of the xattrs will be moved.  But we have to make
4600 * sure that the xattrs with the same hash value are stored in the
4601 * same bucket. If all the xattrs in this bucket have the same hash
4602 * value, the new bucket will be initialized as an empty one and the
4603 * first_hash will be initialized as (hash_value+1).
4604 */
4605static int ocfs2_divide_xattr_bucket(struct inode *inode,
4606				    handle_t *handle,
4607				    u64 blk,
4608				    u64 new_blk,
4609				    u32 *first_hash,
4610				    int new_bucket_head)
4611{
4612	int ret, i;
4613	int count, start, len, name_value_len = 0, name_offset = 0;
4614	struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4615	struct ocfs2_xattr_header *xh;
4616	struct ocfs2_xattr_entry *xe;
4617	int blocksize = inode->i_sb->s_blocksize;
4618
4619	trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4620					      (unsigned long long)new_blk);
4621
4622	s_bucket = ocfs2_xattr_bucket_new(inode);
4623	t_bucket = ocfs2_xattr_bucket_new(inode);
4624	if (!s_bucket || !t_bucket) {
4625		ret = -ENOMEM;
4626		mlog_errno(ret);
4627		goto out;
4628	}
4629
4630	ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4631	if (ret) {
4632		mlog_errno(ret);
4633		goto out;
4634	}
4635
4636	ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4637						OCFS2_JOURNAL_ACCESS_WRITE);
4638	if (ret) {
4639		mlog_errno(ret);
4640		goto out;
4641	}
4642
4643	/*
4644	 * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4645	 * there's no need to read it.
4646	 */
4647	ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4648	if (ret) {
4649		mlog_errno(ret);
4650		goto out;
4651	}
4652
4653	/*
4654	 * Hey, if we're overwriting t_bucket, what difference does
4655	 * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4656	 * same part of ocfs2_cp_xattr_bucket().
4657	 */
4658	ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4659						new_bucket_head ?
4660						OCFS2_JOURNAL_ACCESS_CREATE :
4661						OCFS2_JOURNAL_ACCESS_WRITE);
4662	if (ret) {
4663		mlog_errno(ret);
4664		goto out;
4665	}
4666
4667	xh = bucket_xh(s_bucket);
4668	count = le16_to_cpu(xh->xh_count);
4669	start = ocfs2_xattr_find_divide_pos(xh);
4670
4671	if (start == count) {
4672		xe = &xh->xh_entries[start-1];
4673
4674		/*
4675		 * initialized a new empty bucket here.
4676		 * The hash value is set as one larger than
4677		 * that of the last entry in the previous bucket.
4678		 */
4679		for (i = 0; i < t_bucket->bu_blocks; i++)
4680			memset(bucket_block(t_bucket, i), 0, blocksize);
4681
4682		xh = bucket_xh(t_bucket);
4683		xh->xh_free_start = cpu_to_le16(blocksize);
4684		xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4685		le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4686
4687		goto set_num_buckets;
4688	}
4689
4690	/* copy the whole bucket to the new first. */
4691	ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4692
4693	/* update the new bucket. */
4694	xh = bucket_xh(t_bucket);
4695
4696	/*
4697	 * Calculate the total name/value len and xh_free_start for
4698	 * the old bucket first.
4699	 */
4700	name_offset = OCFS2_XATTR_BUCKET_SIZE;
4701	name_value_len = 0;
4702	for (i = 0; i < start; i++) {
4703		xe = &xh->xh_entries[i];
4704		name_value_len += namevalue_size_xe(xe);
4705		if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4706			name_offset = le16_to_cpu(xe->xe_name_offset);
4707	}
4708
4709	/*
4710	 * Now begin the modification to the new bucket.
4711	 *
4712	 * In the new bucket, We just move the xattr entry to the beginning
4713	 * and don't touch the name/value. So there will be some holes in the
4714	 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4715	 * called.
4716	 */
4717	xe = &xh->xh_entries[start];
4718	len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4719	trace_ocfs2_divide_xattr_bucket_move(len,
4720			(int)((char *)xe - (char *)xh),
4721			(int)((char *)xh->xh_entries - (char *)xh));
4722	memmove((char *)xh->xh_entries, (char *)xe, len);
4723	xe = &xh->xh_entries[count - start];
4724	len = sizeof(struct ocfs2_xattr_entry) * start;
4725	memset((char *)xe, 0, len);
4726
4727	le16_add_cpu(&xh->xh_count, -start);
4728	le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4729
4730	/* Calculate xh_free_start for the new bucket. */
4731	xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4732	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4733		xe = &xh->xh_entries[i];
4734		if (le16_to_cpu(xe->xe_name_offset) <
4735		    le16_to_cpu(xh->xh_free_start))
4736			xh->xh_free_start = xe->xe_name_offset;
4737	}
4738
4739set_num_buckets:
4740	/* set xh->xh_num_buckets for the new xh. */
4741	if (new_bucket_head)
4742		xh->xh_num_buckets = cpu_to_le16(1);
4743	else
4744		xh->xh_num_buckets = 0;
4745
4746	ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4747
4748	/* store the first_hash of the new bucket. */
4749	if (first_hash)
4750		*first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4751
4752	/*
4753	 * Now only update the 1st block of the old bucket.  If we
4754	 * just added a new empty bucket, there is no need to modify
4755	 * it.
4756	 */
4757	if (start == count)
4758		goto out;
4759
4760	xh = bucket_xh(s_bucket);
4761	memset(&xh->xh_entries[start], 0,
4762	       sizeof(struct ocfs2_xattr_entry) * (count - start));
4763	xh->xh_count = cpu_to_le16(start);
4764	xh->xh_free_start = cpu_to_le16(name_offset);
4765	xh->xh_name_value_len = cpu_to_le16(name_value_len);
4766
4767	ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4768
4769out:
4770	ocfs2_xattr_bucket_free(s_bucket);
4771	ocfs2_xattr_bucket_free(t_bucket);
4772
4773	return ret;
4774}
4775
4776/*
4777 * Copy xattr from one bucket to another bucket.
4778 *
4779 * The caller must make sure that the journal transaction
4780 * has enough space for journaling.
4781 */
4782static int ocfs2_cp_xattr_bucket(struct inode *inode,
4783				 handle_t *handle,
4784				 u64 s_blkno,
4785				 u64 t_blkno,
4786				 int t_is_new)
4787{
4788	int ret;
4789	struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4790
4791	BUG_ON(s_blkno == t_blkno);
4792
4793	trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4794				    (unsigned long long)t_blkno,
4795				    t_is_new);
4796
4797	s_bucket = ocfs2_xattr_bucket_new(inode);
4798	t_bucket = ocfs2_xattr_bucket_new(inode);
4799	if (!s_bucket || !t_bucket) {
4800		ret = -ENOMEM;
4801		mlog_errno(ret);
4802		goto out;
4803	}
4804
4805	ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4806	if (ret)
4807		goto out;
4808
4809	/*
4810	 * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4811	 * there's no need to read it.
4812	 */
4813	ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4814	if (ret)
4815		goto out;
4816
4817	/*
4818	 * Hey, if we're overwriting t_bucket, what difference does
4819	 * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4820	 * cluster to fill, we came here from
4821	 * ocfs2_mv_xattr_buckets(), and it is really new -
4822	 * ACCESS_CREATE is required.  But we also might have moved data
4823	 * out of t_bucket before extending back into it.
4824	 * ocfs2_add_new_xattr_bucket() can do this - its call to
4825	 * ocfs2_add_new_xattr_cluster() may have created a new extent
4826	 * and copied out the end of the old extent.  Then it re-extends
4827	 * the old extent back to create space for new xattrs.  That's
4828	 * how we get here, and the bucket isn't really new.
4829	 */
4830	ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4831						t_is_new ?
4832						OCFS2_JOURNAL_ACCESS_CREATE :
4833						OCFS2_JOURNAL_ACCESS_WRITE);
4834	if (ret)
4835		goto out;
4836
4837	ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4838	ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4839
4840out:
4841	ocfs2_xattr_bucket_free(t_bucket);
4842	ocfs2_xattr_bucket_free(s_bucket);
4843
4844	return ret;
4845}
4846
4847/*
4848 * src_blk points to the start of an existing extent.  last_blk points to
4849 * last cluster in that extent.  to_blk points to a newly allocated
4850 * extent.  We copy the buckets from the cluster at last_blk to the new
4851 * extent.  If start_bucket is non-zero, we skip that many buckets before
4852 * we start copying.  The new extent's xh_num_buckets gets set to the
4853 * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4854 * by the same amount.
4855 */
4856static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4857				  u64 src_blk, u64 last_blk, u64 to_blk,
4858				  unsigned int start_bucket,
4859				  u32 *first_hash)
4860{
4861	int i, ret, credits;
4862	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4863	int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4864	int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4865	struct ocfs2_xattr_bucket *old_first, *new_first;
4866
4867	trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4868				     (unsigned long long)to_blk);
4869
4870	BUG_ON(start_bucket >= num_buckets);
4871	if (start_bucket) {
4872		num_buckets -= start_bucket;
4873		last_blk += (start_bucket * blks_per_bucket);
4874	}
4875
4876	/* The first bucket of the original extent */
4877	old_first = ocfs2_xattr_bucket_new(inode);
4878	/* The first bucket of the new extent */
4879	new_first = ocfs2_xattr_bucket_new(inode);
4880	if (!old_first || !new_first) {
4881		ret = -ENOMEM;
4882		mlog_errno(ret);
4883		goto out;
4884	}
4885
4886	ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4887	if (ret) {
4888		mlog_errno(ret);
4889		goto out;
4890	}
4891
4892	/*
4893	 * We need to update the first bucket of the old extent and all
4894	 * the buckets going to the new extent.
4895	 */
4896	credits = ((num_buckets + 1) * blks_per_bucket);
4897	ret = ocfs2_extend_trans(handle, credits);
4898	if (ret) {
4899		mlog_errno(ret);
4900		goto out;
4901	}
4902
4903	ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4904						OCFS2_JOURNAL_ACCESS_WRITE);
4905	if (ret) {
4906		mlog_errno(ret);
4907		goto out;
4908	}
4909
4910	for (i = 0; i < num_buckets; i++) {
4911		ret = ocfs2_cp_xattr_bucket(inode, handle,
4912					    last_blk + (i * blks_per_bucket),
4913					    to_blk + (i * blks_per_bucket),
4914					    1);
4915		if (ret) {
4916			mlog_errno(ret);
4917			goto out;
4918		}
4919	}
4920
4921	/*
4922	 * Get the new bucket ready before we dirty anything
4923	 * (This actually shouldn't fail, because we already dirtied
4924	 * it once in ocfs2_cp_xattr_bucket()).
4925	 */
4926	ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4927	if (ret) {
4928		mlog_errno(ret);
4929		goto out;
4930	}
4931	ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4932						OCFS2_JOURNAL_ACCESS_WRITE);
4933	if (ret) {
4934		mlog_errno(ret);
4935		goto out;
4936	}
4937
4938	/* Now update the headers */
4939	le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4940	ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4941
4942	bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4943	ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4944
4945	if (first_hash)
4946		*first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4947
4948out:
4949	ocfs2_xattr_bucket_free(new_first);
4950	ocfs2_xattr_bucket_free(old_first);
4951	return ret;
4952}
4953
4954/*
4955 * Move some xattrs in this cluster to the new cluster.
4956 * This function should only be called when bucket size == cluster size.
4957 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4958 */
4959static int ocfs2_divide_xattr_cluster(struct inode *inode,
4960				      handle_t *handle,
4961				      u64 prev_blk,
4962				      u64 new_blk,
4963				      u32 *first_hash)
4964{
4965	u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4966	int ret, credits = 2 * blk_per_bucket;
4967
4968	BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4969
4970	ret = ocfs2_extend_trans(handle, credits);
4971	if (ret) {
4972		mlog_errno(ret);
4973		return ret;
4974	}
4975
4976	/* Move half of the xattr in start_blk to the next bucket. */
4977	return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4978					  new_blk, first_hash, 1);
4979}
4980
4981/*
4982 * Move some xattrs from the old cluster to the new one since they are not
4983 * contiguous in ocfs2 xattr tree.
4984 *
4985 * new_blk starts a new separate cluster, and we will move some xattrs from
4986 * prev_blk to it. v_start will be set as the first name hash value in this
4987 * new cluster so that it can be used as e_cpos during tree insertion and
4988 * don't collide with our original b-tree operations. first_bh and header_bh
4989 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4990 * to extend the insert bucket.
4991 *
4992 * The problem is how much xattr should we move to the new one and when should
4993 * we update first_bh and header_bh?
4994 * 1. If cluster size > bucket size, that means the previous cluster has more
4995 *    than 1 bucket, so just move half nums of bucket into the new cluster and
4996 *    update the first_bh and header_bh if the insert bucket has been moved
4997 *    to the new cluster.
4998 * 2. If cluster_size == bucket_size:
4999 *    a) If the previous extent rec has more than one cluster and the insert
5000 *       place isn't in the last cluster, copy the entire last cluster to the
5001 *       new one. This time, we don't need to upate the first_bh and header_bh
5002 *       since they will not be moved into the new cluster.
5003 *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
5004 *       the new one. And we set the extend flag to zero if the insert place is
5005 *       moved into the new allocated cluster since no extend is needed.
5006 */
5007static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5008					    handle_t *handle,
5009					    struct ocfs2_xattr_bucket *first,
5010					    struct ocfs2_xattr_bucket *target,
5011					    u64 new_blk,
5012					    u32 prev_clusters,
5013					    u32 *v_start,
5014					    int *extend)
5015{
5016	int ret;
5017
5018	trace_ocfs2_adjust_xattr_cross_cluster(
5019			(unsigned long long)bucket_blkno(first),
5020			(unsigned long long)new_blk, prev_clusters);
5021
5022	if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5023		ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5024							  handle,
5025							  first, target,
5026							  new_blk,
5027							  prev_clusters,
5028							  v_start);
5029		if (ret)
5030			mlog_errno(ret);
5031	} else {
5032		/* The start of the last cluster in the first extent */
5033		u64 last_blk = bucket_blkno(first) +
5034			((prev_clusters - 1) *
5035			 ocfs2_clusters_to_blocks(inode->i_sb, 1));
5036
5037		if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5038			ret = ocfs2_mv_xattr_buckets(inode, handle,
5039						     bucket_blkno(first),
5040						     last_blk, new_blk, 0,
5041						     v_start);
5042			if (ret)
5043				mlog_errno(ret);
5044		} else {
5045			ret = ocfs2_divide_xattr_cluster(inode, handle,
5046							 last_blk, new_blk,
5047							 v_start);
5048			if (ret)
5049				mlog_errno(ret);
5050
5051			if ((bucket_blkno(target) == last_blk) && extend)
5052				*extend = 0;
5053		}
5054	}
5055
5056	return ret;
5057}
5058
5059/*
5060 * Add a new cluster for xattr storage.
5061 *
5062 * If the new cluster is contiguous with the previous one, it will be
5063 * appended to the same extent record, and num_clusters will be updated.
5064 * If not, we will insert a new extent for it and move some xattrs in
5065 * the last cluster into the new allocated one.
5066 * We also need to limit the maximum size of a btree leaf, otherwise we'll
5067 * lose the benefits of hashing because we'll have to search large leaves.
5068 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5069 * if it's bigger).
5070 *
5071 * first_bh is the first block of the previous extent rec and header_bh
5072 * indicates the bucket we will insert the new xattrs. They will be updated
5073 * when the header_bh is moved into the new cluster.
5074 */
5075static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5076				       struct buffer_head *root_bh,
5077				       struct ocfs2_xattr_bucket *first,
5078				       struct ocfs2_xattr_bucket *target,
5079				       u32 *num_clusters,
5080				       u32 prev_cpos,
5081				       int *extend,
5082				       struct ocfs2_xattr_set_ctxt *ctxt)
5083{
5084	int ret;
5085	u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5086	u32 prev_clusters = *num_clusters;
5087	u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5088	u64 block;
5089	handle_t *handle = ctxt->handle;
5090	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5091	struct ocfs2_extent_tree et;
5092
5093	trace_ocfs2_add_new_xattr_cluster_begin(
5094		(unsigned long long)OCFS2_I(inode)->ip_blkno,
5095		(unsigned long long)bucket_blkno(first),
5096		prev_cpos, prev_clusters);
5097
5098	ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5099
5100	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5101				      OCFS2_JOURNAL_ACCESS_WRITE);
5102	if (ret < 0) {
5103		mlog_errno(ret);
5104		goto leave;
5105	}
5106
5107	ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5108				     clusters_to_add, &bit_off, &num_bits);
5109	if (ret < 0) {
5110		if (ret != -ENOSPC)
5111			mlog_errno(ret);
5112		goto leave;
5113	}
5114
5115	BUG_ON(num_bits > clusters_to_add);
5116
5117	block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5118	trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5119
5120	if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5121	    (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5122	     OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5123		/*
5124		 * If this cluster is contiguous with the old one and
5125		 * adding this new cluster, we don't surpass the limit of
5126		 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5127		 * initialized and used like other buckets in the previous
5128		 * cluster.
5129		 * So add it as a contiguous one. The caller will handle
5130		 * its init process.
5131		 */
5132		v_start = prev_cpos + prev_clusters;
5133		*num_clusters = prev_clusters + num_bits;
5134	} else {
5135		ret = ocfs2_adjust_xattr_cross_cluster(inode,
5136						       handle,
5137						       first,
5138						       target,
5139						       block,
5140						       prev_clusters,
5141						       &v_start,
5142						       extend);
5143		if (ret) {
5144			mlog_errno(ret);
5145			goto leave;
5146		}
5147	}
5148
5149	trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5150						 v_start, num_bits);
5151	ret = ocfs2_insert_extent(handle, &et, v_start, block,
5152				  num_bits, 0, ctxt->meta_ac);
5153	if (ret < 0) {
5154		mlog_errno(ret);
5155		goto leave;
5156	}
5157
5158	ocfs2_journal_dirty(handle, root_bh);
5159
5160leave:
5161	return ret;
5162}
5163
5164/*
5165 * We are given an extent.  'first' is the bucket at the very front of
5166 * the extent.  The extent has space for an additional bucket past
5167 * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
5168 * of the target bucket.  We wish to shift every bucket past the target
5169 * down one, filling in that additional space.  When we get back to the
5170 * target, we split the target between itself and the now-empty bucket
5171 * at target+1 (aka, target_blkno + blks_per_bucket).
5172 */
5173static int ocfs2_extend_xattr_bucket(struct inode *inode,
5174				     handle_t *handle,
5175				     struct ocfs2_xattr_bucket *first,
5176				     u64 target_blk,
5177				     u32 num_clusters)
5178{
5179	int ret, credits;
5180	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5181	u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5182	u64 end_blk;
5183	u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5184
5185	trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5186					(unsigned long long)bucket_blkno(first),
5187					num_clusters, new_bucket);
5188
5189	/* The extent must have room for an additional bucket */
5190	BUG_ON(new_bucket >=
5191	       (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5192
5193	/* end_blk points to the last existing bucket */
5194	end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5195
5196	/*
5197	 * end_blk is the start of the last existing bucket.
5198	 * Thus, (end_blk - target_blk) covers the target bucket and
5199	 * every bucket after it up to, but not including, the last
5200	 * existing bucket.  Then we add the last existing bucket, the
5201	 * new bucket, and the first bucket (3 * blk_per_bucket).
5202	 */
5203	credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5204	ret = ocfs2_extend_trans(handle, credits);
5205	if (ret) {
5206		mlog_errno(ret);
5207		goto out;
5208	}
5209
5210	ret = ocfs2_xattr_bucket_journal_access(handle, first,
5211						OCFS2_JOURNAL_ACCESS_WRITE);
5212	if (ret) {
5213		mlog_errno(ret);
5214		goto out;
5215	}
5216
5217	while (end_blk != target_blk) {
5218		ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5219					    end_blk + blk_per_bucket, 0);
5220		if (ret)
5221			goto out;
5222		end_blk -= blk_per_bucket;
5223	}
5224
5225	/* Move half of the xattr in target_blkno to the next bucket. */
5226	ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5227					target_blk + blk_per_bucket, NULL, 0);
5228
5229	le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5230	ocfs2_xattr_bucket_journal_dirty(handle, first);
5231
5232out:
5233	return ret;
5234}
5235
5236/*
5237 * Add new xattr bucket in an extent record and adjust the buckets
5238 * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
5239 * bucket we want to insert into.
5240 *
5241 * In the easy case, we will move all the buckets after target down by
5242 * one. Half of target's xattrs will be moved to the next bucket.
5243 *
5244 * If current cluster is full, we'll allocate a new one.  This may not
5245 * be contiguous.  The underlying calls will make sure that there is
5246 * space for the insert, shifting buckets around if necessary.
5247 * 'target' may be moved by those calls.
5248 */
5249static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5250				      struct buffer_head *xb_bh,
5251				      struct ocfs2_xattr_bucket *target,
5252				      struct ocfs2_xattr_set_ctxt *ctxt)
5253{
5254	struct ocfs2_xattr_block *xb =
5255			(struct ocfs2_xattr_block *)xb_bh->b_data;
5256	struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5257	struct ocfs2_extent_list *el = &xb_root->xt_list;
5258	u32 name_hash =
5259		le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5260	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5261	int ret, num_buckets, extend = 1;
5262	u64 p_blkno;
5263	u32 e_cpos, num_clusters;
5264	/* The bucket at the front of the extent */
5265	struct ocfs2_xattr_bucket *first;
5266
5267	trace_ocfs2_add_new_xattr_bucket(
5268				(unsigned long long)bucket_blkno(target));
5269
5270	/* The first bucket of the original extent */
5271	first = ocfs2_xattr_bucket_new(inode);
5272	if (!first) {
5273		ret = -ENOMEM;
5274		mlog_errno(ret);
5275		goto out;
5276	}
5277
5278	ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5279				  &num_clusters, el);
5280	if (ret) {
5281		mlog_errno(ret);
5282		goto out;
5283	}
5284
5285	ret = ocfs2_read_xattr_bucket(first, p_blkno);
5286	if (ret) {
5287		mlog_errno(ret);
5288		goto out;
5289	}
5290
5291	num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5292	if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5293		/*
5294		 * This can move first+target if the target bucket moves
5295		 * to the new extent.
5296		 */
5297		ret = ocfs2_add_new_xattr_cluster(inode,
5298						  xb_bh,
5299						  first,
5300						  target,
5301						  &num_clusters,
5302						  e_cpos,
5303						  &extend,
5304						  ctxt);
5305		if (ret) {
5306			mlog_errno(ret);
5307			goto out;
5308		}
5309	}
5310
5311	if (extend) {
5312		ret = ocfs2_extend_xattr_bucket(inode,
5313						ctxt->handle,
5314						first,
5315						bucket_blkno(target),
5316						num_clusters);
5317		if (ret)
5318			mlog_errno(ret);
5319	}
5320
5321out:
5322	ocfs2_xattr_bucket_free(first);
5323
5324	return ret;
5325}
5326
5327static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5328					struct ocfs2_xattr_bucket *bucket,
5329					int offs)
5330{
5331	int block_off = offs >> inode->i_sb->s_blocksize_bits;
5332
5333	offs = offs % inode->i_sb->s_blocksize;
5334	return bucket_block(bucket, block_off) + offs;
5335}
5336
5337/*
5338 * Truncate the specified xe_off entry in xattr bucket.
5339 * bucket is indicated by header_bh and len is the new length.
5340 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5341 *
5342 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5343 */
5344static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5345					     struct ocfs2_xattr_bucket *bucket,
5346					     int xe_off,
5347					     int len,
5348					     struct ocfs2_xattr_set_ctxt *ctxt)
5349{
5350	int ret, offset;
5351	u64 value_blk;
5352	struct ocfs2_xattr_entry *xe;
5353	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5354	size_t blocksize = inode->i_sb->s_blocksize;
5355	struct ocfs2_xattr_value_buf vb = {
5356		.vb_access = ocfs2_journal_access,
5357	};
5358
5359	xe = &xh->xh_entries[xe_off];
5360
5361	BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5362
5363	offset = le16_to_cpu(xe->xe_name_offset) +
5364		 OCFS2_XATTR_SIZE(xe->xe_name_len);
5365
5366	value_blk = offset / blocksize;
5367
5368	/* We don't allow ocfs2_xattr_value to be stored in different block. */
5369	BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5370
5371	vb.vb_bh = bucket->bu_bhs[value_blk];
5372	BUG_ON(!vb.vb_bh);
5373
5374	vb.vb_xv = (struct ocfs2_xattr_value_root *)
5375		(vb.vb_bh->b_data + offset % blocksize);
5376
5377	/*
5378	 * From here on out we have to dirty the bucket.  The generic
5379	 * value calls only modify one of the bucket's bhs, but we need
5380	 * to send the bucket at once.  So if they error, they *could* have
5381	 * modified something.  We have to assume they did, and dirty
5382	 * the whole bucket.  This leaves us in a consistent state.
5383	 */
5384	trace_ocfs2_xattr_bucket_value_truncate(
5385			(unsigned long long)bucket_blkno(bucket), xe_off, len);
5386	ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5387	if (ret) {
5388		mlog_errno(ret);
5389		goto out;
5390	}
5391
5392	ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5393						OCFS2_JOURNAL_ACCESS_WRITE);
5394	if (ret) {
5395		mlog_errno(ret);
5396		goto out;
5397	}
5398
5399	xe->xe_value_size = cpu_to_le64(len);
5400
5401	ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5402
5403out:
5404	return ret;
5405}
5406
5407static int ocfs2_rm_xattr_cluster(struct inode *inode,
5408				  struct buffer_head *root_bh,
5409				  u64 blkno,
5410				  u32 cpos,
5411				  u32 len,
5412				  void *para)
5413{
5414	int ret;
5415	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5416	struct inode *tl_inode = osb->osb_tl_inode;
5417	handle_t *handle;
5418	struct ocfs2_xattr_block *xb =
5419			(struct ocfs2_xattr_block *)root_bh->b_data;
5420	struct ocfs2_alloc_context *meta_ac = NULL;
5421	struct ocfs2_cached_dealloc_ctxt dealloc;
5422	struct ocfs2_extent_tree et;
5423
5424	ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5425					  ocfs2_delete_xattr_in_bucket, para);
5426	if (ret) {
5427		mlog_errno(ret);
5428		return ret;
5429	}
5430
5431	ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5432
5433	ocfs2_init_dealloc_ctxt(&dealloc);
5434
5435	trace_ocfs2_rm_xattr_cluster(
5436			(unsigned long long)OCFS2_I(inode)->ip_blkno,
5437			(unsigned long long)blkno, cpos, len);
5438
5439	ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5440					       len);
5441
5442	ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5443	if (ret) {
5444		mlog_errno(ret);
5445		return ret;
5446	}
5447
5448	mutex_lock(&tl_inode->i_mutex);
5449
5450	if (ocfs2_truncate_log_needs_flush(osb)) {
5451		ret = __ocfs2_flush_truncate_log(osb);
5452		if (ret < 0) {
5453			mlog_errno(ret);
5454			goto out;
5455		}
5456	}
5457
5458	handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5459	if (IS_ERR(handle)) {
5460		ret = -ENOMEM;
5461		mlog_errno(ret);
5462		goto out;
5463	}
5464
5465	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5466				      OCFS2_JOURNAL_ACCESS_WRITE);
5467	if (ret) {
5468		mlog_errno(ret);
5469		goto out_commit;
5470	}
5471
5472	ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5473				  &dealloc);
5474	if (ret) {
5475		mlog_errno(ret);
5476		goto out_commit;
5477	}
5478
5479	le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5480	ocfs2_journal_dirty(handle, root_bh);
5481
5482	ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5483	if (ret)
5484		mlog_errno(ret);
 
5485
5486out_commit:
5487	ocfs2_commit_trans(osb, handle);
5488out:
5489	ocfs2_schedule_truncate_log_flush(osb, 1);
5490
5491	mutex_unlock(&tl_inode->i_mutex);
5492
5493	if (meta_ac)
5494		ocfs2_free_alloc_context(meta_ac);
5495
5496	ocfs2_run_deallocs(osb, &dealloc);
5497
5498	return ret;
5499}
5500
5501/*
5502 * check whether the xattr bucket is filled up with the same hash value.
5503 * If we want to insert the xattr with the same hash, return -ENOSPC.
5504 * If we want to insert a xattr with different hash value, go ahead
5505 * and ocfs2_divide_xattr_bucket will handle this.
5506 */
5507static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5508					      struct ocfs2_xattr_bucket *bucket,
5509					      const char *name)
5510{
5511	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5512	u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5513
5514	if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5515		return 0;
5516
5517	if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5518	    xh->xh_entries[0].xe_name_hash) {
5519		mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5520		     "hash = %u\n",
5521		     (unsigned long long)bucket_blkno(bucket),
5522		     le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5523		return -ENOSPC;
5524	}
5525
5526	return 0;
5527}
5528
5529/*
5530 * Try to set the entry in the current bucket.  If we fail, the caller
5531 * will handle getting us another bucket.
5532 */
5533static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5534					struct ocfs2_xattr_info *xi,
5535					struct ocfs2_xattr_search *xs,
5536					struct ocfs2_xattr_set_ctxt *ctxt)
5537{
5538	int ret;
5539	struct ocfs2_xa_loc loc;
5540
5541	trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5542
5543	ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5544				       xs->not_found ? NULL : xs->here);
5545	ret = ocfs2_xa_set(&loc, xi, ctxt);
5546	if (!ret) {
5547		xs->here = loc.xl_entry;
5548		goto out;
5549	}
5550	if (ret != -ENOSPC) {
5551		mlog_errno(ret);
5552		goto out;
5553	}
5554
5555	/* Ok, we need space.  Let's try defragmenting the bucket. */
5556	ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5557					xs->bucket);
5558	if (ret) {
5559		mlog_errno(ret);
5560		goto out;
5561	}
5562
5563	ret = ocfs2_xa_set(&loc, xi, ctxt);
5564	if (!ret) {
5565		xs->here = loc.xl_entry;
5566		goto out;
5567	}
5568	if (ret != -ENOSPC)
5569		mlog_errno(ret);
5570
5571
5572out:
5573	return ret;
5574}
5575
5576static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5577					     struct ocfs2_xattr_info *xi,
5578					     struct ocfs2_xattr_search *xs,
5579					     struct ocfs2_xattr_set_ctxt *ctxt)
5580{
5581	int ret;
5582
5583	trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5584
5585	ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5586	if (!ret)
5587		goto out;
5588	if (ret != -ENOSPC) {
5589		mlog_errno(ret);
5590		goto out;
5591	}
5592
5593	/* Ack, need more space.  Let's try to get another bucket! */
5594
5595	/*
5596	 * We do not allow for overlapping ranges between buckets. And
5597	 * the maximum number of collisions we will allow for then is
5598	 * one bucket's worth, so check it here whether we need to
5599	 * add a new bucket for the insert.
5600	 */
5601	ret = ocfs2_check_xattr_bucket_collision(inode,
5602						 xs->bucket,
5603						 xi->xi_name);
5604	if (ret) {
5605		mlog_errno(ret);
5606		goto out;
5607	}
5608
5609	ret = ocfs2_add_new_xattr_bucket(inode,
5610					 xs->xattr_bh,
5611					 xs->bucket,
5612					 ctxt);
5613	if (ret) {
5614		mlog_errno(ret);
5615		goto out;
5616	}
5617
5618	/*
5619	 * ocfs2_add_new_xattr_bucket() will have updated
5620	 * xs->bucket if it moved, but it will not have updated
5621	 * any of the other search fields.  Thus, we drop it and
5622	 * re-search.  Everything should be cached, so it'll be
5623	 * quick.
5624	 */
5625	ocfs2_xattr_bucket_relse(xs->bucket);
5626	ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5627					   xi->xi_name_index,
5628					   xi->xi_name, xs);
5629	if (ret && ret != -ENODATA)
5630		goto out;
5631	xs->not_found = ret;
5632
5633	/* Ok, we have a new bucket, let's try again */
5634	ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5635	if (ret && (ret != -ENOSPC))
5636		mlog_errno(ret);
5637
5638out:
5639	return ret;
5640}
5641
5642static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5643					struct ocfs2_xattr_bucket *bucket,
5644					void *para)
5645{
5646	int ret = 0, ref_credits;
5647	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5648	u16 i;
5649	struct ocfs2_xattr_entry *xe;
5650	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5651	struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5652	int credits = ocfs2_remove_extent_credits(osb->sb) +
5653		ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5654	struct ocfs2_xattr_value_root *xv;
5655	struct ocfs2_rm_xattr_bucket_para *args =
5656			(struct ocfs2_rm_xattr_bucket_para *)para;
5657
5658	ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5659
5660	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5661		xe = &xh->xh_entries[i];
5662		if (ocfs2_xattr_is_local(xe))
5663			continue;
5664
5665		ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5666						      i, &xv, NULL);
 
 
 
 
5667
5668		ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5669							 args->ref_ci,
5670							 args->ref_root_bh,
5671							 &ctxt.meta_ac,
5672							 &ref_credits);
5673
5674		ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5675		if (IS_ERR(ctxt.handle)) {
5676			ret = PTR_ERR(ctxt.handle);
5677			mlog_errno(ret);
5678			break;
5679		}
5680
5681		ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5682							i, 0, &ctxt);
5683
5684		ocfs2_commit_trans(osb, ctxt.handle);
5685		if (ctxt.meta_ac) {
5686			ocfs2_free_alloc_context(ctxt.meta_ac);
5687			ctxt.meta_ac = NULL;
5688		}
5689		if (ret) {
5690			mlog_errno(ret);
5691			break;
5692		}
5693	}
5694
5695	if (ctxt.meta_ac)
5696		ocfs2_free_alloc_context(ctxt.meta_ac);
5697	ocfs2_schedule_truncate_log_flush(osb, 1);
5698	ocfs2_run_deallocs(osb, &ctxt.dealloc);
5699	return ret;
5700}
5701
5702/*
5703 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5704 * or change the extent record flag), we need to recalculate
5705 * the metaecc for the whole bucket. So it is done here.
5706 *
5707 * Note:
5708 * We have to give the extra credits for the caller.
5709 */
5710static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5711					    handle_t *handle,
5712					    void *para)
5713{
5714	int ret;
5715	struct ocfs2_xattr_bucket *bucket =
5716			(struct ocfs2_xattr_bucket *)para;
5717
5718	ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5719						OCFS2_JOURNAL_ACCESS_WRITE);
5720	if (ret) {
5721		mlog_errno(ret);
5722		return ret;
5723	}
5724
5725	ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5726
5727	return 0;
5728}
5729
5730/*
5731 * Special action we need if the xattr value is refcounted.
5732 *
5733 * 1. If the xattr is refcounted, lock the tree.
5734 * 2. CoW the xattr if we are setting the new value and the value
5735 *    will be stored outside.
5736 * 3. In other case, decrease_refcount will work for us, so just
5737 *    lock the refcount tree, calculate the meta and credits is OK.
5738 *
5739 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5740 * currently CoW is a completed transaction, while this function
5741 * will also lock the allocators and let us deadlock. So we will
5742 * CoW the whole xattr value.
5743 */
5744static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5745					struct ocfs2_dinode *di,
5746					struct ocfs2_xattr_info *xi,
5747					struct ocfs2_xattr_search *xis,
5748					struct ocfs2_xattr_search *xbs,
5749					struct ocfs2_refcount_tree **ref_tree,
5750					int *meta_add,
5751					int *credits)
5752{
5753	int ret = 0;
5754	struct ocfs2_xattr_block *xb;
5755	struct ocfs2_xattr_entry *xe;
5756	char *base;
5757	u32 p_cluster, num_clusters;
5758	unsigned int ext_flags;
5759	int name_offset, name_len;
5760	struct ocfs2_xattr_value_buf vb;
5761	struct ocfs2_xattr_bucket *bucket = NULL;
5762	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5763	struct ocfs2_post_refcount refcount;
5764	struct ocfs2_post_refcount *p = NULL;
5765	struct buffer_head *ref_root_bh = NULL;
5766
5767	if (!xis->not_found) {
5768		xe = xis->here;
5769		name_offset = le16_to_cpu(xe->xe_name_offset);
5770		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5771		base = xis->base;
5772		vb.vb_bh = xis->inode_bh;
5773		vb.vb_access = ocfs2_journal_access_di;
5774	} else {
5775		int i, block_off = 0;
5776		xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5777		xe = xbs->here;
5778		name_offset = le16_to_cpu(xe->xe_name_offset);
5779		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5780		i = xbs->here - xbs->header->xh_entries;
5781
5782		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5783			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5784							bucket_xh(xbs->bucket),
5785							i, &block_off,
5786							&name_offset);
5787			if (ret) {
5788				mlog_errno(ret);
5789				goto out;
5790			}
5791			base = bucket_block(xbs->bucket, block_off);
5792			vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5793			vb.vb_access = ocfs2_journal_access;
5794
5795			if (ocfs2_meta_ecc(osb)) {
5796				/*create parameters for ocfs2_post_refcount. */
5797				bucket = xbs->bucket;
5798				refcount.credits = bucket->bu_blocks;
5799				refcount.para = bucket;
5800				refcount.func =
5801					ocfs2_xattr_bucket_post_refcount;
5802				p = &refcount;
5803			}
5804		} else {
5805			base = xbs->base;
5806			vb.vb_bh = xbs->xattr_bh;
5807			vb.vb_access = ocfs2_journal_access_xb;
5808		}
5809	}
5810
5811	if (ocfs2_xattr_is_local(xe))
5812		goto out;
5813
5814	vb.vb_xv = (struct ocfs2_xattr_value_root *)
5815				(base + name_offset + name_len);
5816
5817	ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5818				       &num_clusters, &vb.vb_xv->xr_list,
5819				       &ext_flags);
5820	if (ret) {
5821		mlog_errno(ret);
5822		goto out;
5823	}
5824
5825	/*
5826	 * We just need to check the 1st extent record, since we always
5827	 * CoW the whole xattr. So there shouldn't be a xattr with
5828	 * some REFCOUNT extent recs after the 1st one.
5829	 */
5830	if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5831		goto out;
5832
5833	ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5834				       1, ref_tree, &ref_root_bh);
5835	if (ret) {
5836		mlog_errno(ret);
5837		goto out;
5838	}
5839
5840	/*
5841	 * If we are deleting the xattr or the new size will be stored inside,
5842	 * cool, leave it there, the xattr truncate process will remove them
5843	 * for us(it still needs the refcount tree lock and the meta, credits).
5844	 * And the worse case is that every cluster truncate will split the
5845	 * refcount tree, and make the original extent become 3. So we will need
5846	 * 2 * cluster more extent recs at most.
5847	 */
5848	if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5849
5850		ret = ocfs2_refcounted_xattr_delete_need(inode,
5851							 &(*ref_tree)->rf_ci,
5852							 ref_root_bh, vb.vb_xv,
5853							 meta_add, credits);
5854		if (ret)
5855			mlog_errno(ret);
5856		goto out;
5857	}
5858
5859	ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5860				       *ref_tree, ref_root_bh, 0,
5861				       le32_to_cpu(vb.vb_xv->xr_clusters), p);
5862	if (ret)
5863		mlog_errno(ret);
5864
5865out:
5866	brelse(ref_root_bh);
5867	return ret;
5868}
5869
5870/*
5871 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5872 * The physical clusters will be added to refcount tree.
5873 */
5874static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5875				struct ocfs2_xattr_value_root *xv,
5876				struct ocfs2_extent_tree *value_et,
5877				struct ocfs2_caching_info *ref_ci,
5878				struct buffer_head *ref_root_bh,
5879				struct ocfs2_cached_dealloc_ctxt *dealloc,
5880				struct ocfs2_post_refcount *refcount)
5881{
5882	int ret = 0;
5883	u32 clusters = le32_to_cpu(xv->xr_clusters);
5884	u32 cpos, p_cluster, num_clusters;
5885	struct ocfs2_extent_list *el = &xv->xr_list;
5886	unsigned int ext_flags;
5887
5888	cpos = 0;
5889	while (cpos < clusters) {
5890		ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5891					       &num_clusters, el, &ext_flags);
 
 
 
 
5892
5893		cpos += num_clusters;
5894		if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5895			continue;
5896
5897		BUG_ON(!p_cluster);
5898
5899		ret = ocfs2_add_refcount_flag(inode, value_et,
5900					      ref_ci, ref_root_bh,
5901					      cpos - num_clusters,
5902					      p_cluster, num_clusters,
5903					      dealloc, refcount);
5904		if (ret) {
5905			mlog_errno(ret);
5906			break;
5907		}
5908	}
5909
5910	return ret;
5911}
5912
5913/*
5914 * Given a normal ocfs2_xattr_header, refcount all the entries which
5915 * have value stored outside.
5916 * Used for xattrs stored in inode and ocfs2_xattr_block.
5917 */
5918static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5919				struct ocfs2_xattr_value_buf *vb,
5920				struct ocfs2_xattr_header *header,
5921				struct ocfs2_caching_info *ref_ci,
5922				struct buffer_head *ref_root_bh,
5923				struct ocfs2_cached_dealloc_ctxt *dealloc)
5924{
5925
5926	struct ocfs2_xattr_entry *xe;
5927	struct ocfs2_xattr_value_root *xv;
5928	struct ocfs2_extent_tree et;
5929	int i, ret = 0;
5930
5931	for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5932		xe = &header->xh_entries[i];
5933
5934		if (ocfs2_xattr_is_local(xe))
5935			continue;
5936
5937		xv = (struct ocfs2_xattr_value_root *)((void *)header +
5938			le16_to_cpu(xe->xe_name_offset) +
5939			OCFS2_XATTR_SIZE(xe->xe_name_len));
5940
5941		vb->vb_xv = xv;
5942		ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5943
5944		ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5945							ref_ci, ref_root_bh,
5946							dealloc, NULL);
5947		if (ret) {
5948			mlog_errno(ret);
5949			break;
5950		}
5951	}
5952
5953	return ret;
5954}
5955
5956static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5957				struct buffer_head *fe_bh,
5958				struct ocfs2_caching_info *ref_ci,
5959				struct buffer_head *ref_root_bh,
5960				struct ocfs2_cached_dealloc_ctxt *dealloc)
5961{
5962	struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5963	struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5964				(fe_bh->b_data + inode->i_sb->s_blocksize -
5965				le16_to_cpu(di->i_xattr_inline_size));
5966	struct ocfs2_xattr_value_buf vb = {
5967		.vb_bh = fe_bh,
5968		.vb_access = ocfs2_journal_access_di,
5969	};
5970
5971	return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5972						  ref_ci, ref_root_bh, dealloc);
5973}
5974
5975struct ocfs2_xattr_tree_value_refcount_para {
5976	struct ocfs2_caching_info *ref_ci;
5977	struct buffer_head *ref_root_bh;
5978	struct ocfs2_cached_dealloc_ctxt *dealloc;
5979};
5980
5981static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5982					   struct ocfs2_xattr_bucket *bucket,
5983					   int offset,
5984					   struct ocfs2_xattr_value_root **xv,
5985					   struct buffer_head **bh)
5986{
5987	int ret, block_off, name_offset;
5988	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5989	struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5990	void *base;
5991
5992	ret = ocfs2_xattr_bucket_get_name_value(sb,
5993						bucket_xh(bucket),
5994						offset,
5995						&block_off,
5996						&name_offset);
5997	if (ret) {
5998		mlog_errno(ret);
5999		goto out;
6000	}
6001
6002	base = bucket_block(bucket, block_off);
6003
6004	*xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6005			 OCFS2_XATTR_SIZE(xe->xe_name_len));
6006
6007	if (bh)
6008		*bh = bucket->bu_bhs[block_off];
6009out:
6010	return ret;
6011}
6012
6013/*
6014 * For a given xattr bucket, refcount all the entries which
6015 * have value stored outside.
6016 */
6017static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6018					     struct ocfs2_xattr_bucket *bucket,
6019					     void *para)
6020{
6021	int i, ret = 0;
6022	struct ocfs2_extent_tree et;
6023	struct ocfs2_xattr_tree_value_refcount_para *ref =
6024			(struct ocfs2_xattr_tree_value_refcount_para *)para;
6025	struct ocfs2_xattr_header *xh =
6026			(struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6027	struct ocfs2_xattr_entry *xe;
6028	struct ocfs2_xattr_value_buf vb = {
6029		.vb_access = ocfs2_journal_access,
6030	};
6031	struct ocfs2_post_refcount refcount = {
6032		.credits = bucket->bu_blocks,
6033		.para = bucket,
6034		.func = ocfs2_xattr_bucket_post_refcount,
6035	};
6036	struct ocfs2_post_refcount *p = NULL;
6037
6038	/* We only need post_refcount if we support metaecc. */
6039	if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6040		p = &refcount;
6041
6042	trace_ocfs2_xattr_bucket_value_refcount(
6043				(unsigned long long)bucket_blkno(bucket),
6044				le16_to_cpu(xh->xh_count));
6045	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6046		xe = &xh->xh_entries[i];
6047
6048		if (ocfs2_xattr_is_local(xe))
6049			continue;
6050
6051		ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6052						      &vb.vb_xv, &vb.vb_bh);
6053		if (ret) {
6054			mlog_errno(ret);
6055			break;
6056		}
6057
6058		ocfs2_init_xattr_value_extent_tree(&et,
6059						   INODE_CACHE(inode), &vb);
6060
6061		ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6062							&et, ref->ref_ci,
6063							ref->ref_root_bh,
6064							ref->dealloc, p);
6065		if (ret) {
6066			mlog_errno(ret);
6067			break;
6068		}
6069	}
6070
6071	return ret;
6072
6073}
6074
6075static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6076				     struct buffer_head *root_bh,
6077				     u64 blkno, u32 cpos, u32 len, void *para)
6078{
6079	return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6080					   ocfs2_xattr_bucket_value_refcount,
6081					   para);
6082}
6083
6084static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6085				struct buffer_head *blk_bh,
6086				struct ocfs2_caching_info *ref_ci,
6087				struct buffer_head *ref_root_bh,
6088				struct ocfs2_cached_dealloc_ctxt *dealloc)
6089{
6090	int ret = 0;
6091	struct ocfs2_xattr_block *xb =
6092				(struct ocfs2_xattr_block *)blk_bh->b_data;
6093
6094	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6095		struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6096		struct ocfs2_xattr_value_buf vb = {
6097			.vb_bh = blk_bh,
6098			.vb_access = ocfs2_journal_access_xb,
6099		};
6100
6101		ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6102							 ref_ci, ref_root_bh,
6103							 dealloc);
6104	} else {
6105		struct ocfs2_xattr_tree_value_refcount_para para = {
6106			.ref_ci = ref_ci,
6107			.ref_root_bh = ref_root_bh,
6108			.dealloc = dealloc,
6109		};
6110
6111		ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6112						ocfs2_refcount_xattr_tree_rec,
6113						&para);
6114	}
6115
6116	return ret;
6117}
6118
6119int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6120				     struct buffer_head *fe_bh,
6121				     struct ocfs2_caching_info *ref_ci,
6122				     struct buffer_head *ref_root_bh,
6123				     struct ocfs2_cached_dealloc_ctxt *dealloc)
6124{
6125	int ret = 0;
6126	struct ocfs2_inode_info *oi = OCFS2_I(inode);
6127	struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6128	struct buffer_head *blk_bh = NULL;
6129
6130	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6131		ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6132							 ref_ci, ref_root_bh,
6133							 dealloc);
6134		if (ret) {
6135			mlog_errno(ret);
6136			goto out;
6137		}
6138	}
6139
6140	if (!di->i_xattr_loc)
6141		goto out;
6142
6143	ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6144				     &blk_bh);
6145	if (ret < 0) {
6146		mlog_errno(ret);
6147		goto out;
6148	}
6149
6150	ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6151						ref_root_bh, dealloc);
6152	if (ret)
6153		mlog_errno(ret);
6154
6155	brelse(blk_bh);
6156out:
6157
6158	return ret;
6159}
6160
6161typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6162/*
6163 * Store the information we need in xattr reflink.
6164 * old_bh and new_bh are inode bh for the old and new inode.
6165 */
6166struct ocfs2_xattr_reflink {
6167	struct inode *old_inode;
6168	struct inode *new_inode;
6169	struct buffer_head *old_bh;
6170	struct buffer_head *new_bh;
6171	struct ocfs2_caching_info *ref_ci;
6172	struct buffer_head *ref_root_bh;
6173	struct ocfs2_cached_dealloc_ctxt *dealloc;
6174	should_xattr_reflinked *xattr_reflinked;
6175};
6176
6177/*
6178 * Given a xattr header and xe offset,
6179 * return the proper xv and the corresponding bh.
6180 * xattr in inode, block and xattr tree have different implementaions.
6181 */
6182typedef int (get_xattr_value_root)(struct super_block *sb,
6183				   struct buffer_head *bh,
6184				   struct ocfs2_xattr_header *xh,
6185				   int offset,
6186				   struct ocfs2_xattr_value_root **xv,
6187				   struct buffer_head **ret_bh,
6188				   void *para);
6189
6190/*
6191 * Calculate all the xattr value root metadata stored in this xattr header and
6192 * credits we need if we create them from the scratch.
6193 * We use get_xattr_value_root so that all types of xattr container can use it.
6194 */
6195static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6196					     struct buffer_head *bh,
6197					     struct ocfs2_xattr_header *xh,
6198					     int *metas, int *credits,
6199					     int *num_recs,
6200					     get_xattr_value_root *func,
6201					     void *para)
6202{
6203	int i, ret = 0;
6204	struct ocfs2_xattr_value_root *xv;
6205	struct ocfs2_xattr_entry *xe;
6206
6207	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6208		xe = &xh->xh_entries[i];
6209		if (ocfs2_xattr_is_local(xe))
6210			continue;
6211
6212		ret = func(sb, bh, xh, i, &xv, NULL, para);
6213		if (ret) {
6214			mlog_errno(ret);
6215			break;
6216		}
6217
6218		*metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6219			  le16_to_cpu(xv->xr_list.l_next_free_rec);
6220
6221		*credits += ocfs2_calc_extend_credits(sb,
6222						&def_xv.xv.xr_list,
6223						le32_to_cpu(xv->xr_clusters));
6224
6225		/*
6226		 * If the value is a tree with depth > 1, We don't go deep
6227		 * to the extent block, so just calculate a maximum record num.
6228		 */
6229		if (!xv->xr_list.l_tree_depth)
6230			*num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6231		else
6232			*num_recs += ocfs2_clusters_for_bytes(sb,
6233							      XATTR_SIZE_MAX);
6234	}
6235
6236	return ret;
6237}
6238
6239/* Used by xattr inode and block to return the right xv and buffer_head. */
6240static int ocfs2_get_xattr_value_root(struct super_block *sb,
6241				      struct buffer_head *bh,
6242				      struct ocfs2_xattr_header *xh,
6243				      int offset,
6244				      struct ocfs2_xattr_value_root **xv,
6245				      struct buffer_head **ret_bh,
6246				      void *para)
6247{
6248	struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6249
6250	*xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6251		le16_to_cpu(xe->xe_name_offset) +
6252		OCFS2_XATTR_SIZE(xe->xe_name_len));
6253
6254	if (ret_bh)
6255		*ret_bh = bh;
6256
6257	return 0;
6258}
6259
6260/*
6261 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6262 * It is only used for inline xattr and xattr block.
6263 */
6264static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6265					struct ocfs2_xattr_header *xh,
6266					struct buffer_head *ref_root_bh,
6267					int *credits,
6268					struct ocfs2_alloc_context **meta_ac)
6269{
6270	int ret, meta_add = 0, num_recs = 0;
6271	struct ocfs2_refcount_block *rb =
6272			(struct ocfs2_refcount_block *)ref_root_bh->b_data;
6273
6274	*credits = 0;
6275
6276	ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6277						&meta_add, credits, &num_recs,
6278						ocfs2_get_xattr_value_root,
6279						NULL);
6280	if (ret) {
6281		mlog_errno(ret);
6282		goto out;
6283	}
6284
6285	/*
6286	 * We need to add/modify num_recs in refcount tree, so just calculate
6287	 * an approximate number we need for refcount tree change.
6288	 * Sometimes we need to split the tree, and after split,  half recs
6289	 * will be moved to the new block, and a new block can only provide
6290	 * half number of recs. So we multiple new blocks by 2.
6291	 */
6292	num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6293	meta_add += num_recs;
6294	*credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6295	if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6296		*credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6297			    le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6298	else
6299		*credits += 1;
6300
6301	ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6302	if (ret)
6303		mlog_errno(ret);
6304
6305out:
6306	return ret;
6307}
6308
6309/*
6310 * Given a xattr header, reflink all the xattrs in this container.
6311 * It can be used for inode, block and bucket.
6312 *
6313 * NOTE:
6314 * Before we call this function, the caller has memcpy the xattr in
6315 * old_xh to the new_xh.
6316 *
6317 * If args.xattr_reflinked is set, call it to decide whether the xe should
6318 * be reflinked or not. If not, remove it from the new xattr header.
6319 */
6320static int ocfs2_reflink_xattr_header(handle_t *handle,
6321				      struct ocfs2_xattr_reflink *args,
6322				      struct buffer_head *old_bh,
6323				      struct ocfs2_xattr_header *xh,
6324				      struct buffer_head *new_bh,
6325				      struct ocfs2_xattr_header *new_xh,
6326				      struct ocfs2_xattr_value_buf *vb,
6327				      struct ocfs2_alloc_context *meta_ac,
6328				      get_xattr_value_root *func,
6329				      void *para)
6330{
6331	int ret = 0, i, j;
6332	struct super_block *sb = args->old_inode->i_sb;
6333	struct buffer_head *value_bh;
6334	struct ocfs2_xattr_entry *xe, *last;
6335	struct ocfs2_xattr_value_root *xv, *new_xv;
6336	struct ocfs2_extent_tree data_et;
6337	u32 clusters, cpos, p_cluster, num_clusters;
6338	unsigned int ext_flags = 0;
6339
6340	trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6341					 le16_to_cpu(xh->xh_count));
6342
6343	last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6344	for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6345		xe = &xh->xh_entries[i];
6346
6347		if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6348			xe = &new_xh->xh_entries[j];
6349
6350			le16_add_cpu(&new_xh->xh_count, -1);
6351			if (new_xh->xh_count) {
6352				memmove(xe, xe + 1,
6353					(void *)last - (void *)xe);
6354				memset(last, 0,
6355				       sizeof(struct ocfs2_xattr_entry));
6356			}
6357
6358			/*
6359			 * We don't want j to increase in the next round since
6360			 * it is already moved ahead.
6361			 */
6362			j--;
6363			continue;
6364		}
6365
6366		if (ocfs2_xattr_is_local(xe))
6367			continue;
6368
6369		ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6370		if (ret) {
6371			mlog_errno(ret);
6372			break;
6373		}
6374
6375		ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6376		if (ret) {
6377			mlog_errno(ret);
6378			break;
6379		}
6380
6381		/*
6382		 * For the xattr which has l_tree_depth = 0, all the extent
6383		 * recs have already be copied to the new xh with the
6384		 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6385		 * increase the refount count int the refcount tree.
6386		 *
6387		 * For the xattr which has l_tree_depth > 0, we need
6388		 * to initialize it to the empty default value root,
6389		 * and then insert the extents one by one.
6390		 */
6391		if (xv->xr_list.l_tree_depth) {
6392			memcpy(new_xv, &def_xv, sizeof(def_xv));
6393			vb->vb_xv = new_xv;
6394			vb->vb_bh = value_bh;
6395			ocfs2_init_xattr_value_extent_tree(&data_et,
6396					INODE_CACHE(args->new_inode), vb);
6397		}
6398
6399		clusters = le32_to_cpu(xv->xr_clusters);
6400		cpos = 0;
6401		while (cpos < clusters) {
6402			ret = ocfs2_xattr_get_clusters(args->old_inode,
6403						       cpos,
6404						       &p_cluster,
6405						       &num_clusters,
6406						       &xv->xr_list,
6407						       &ext_flags);
6408			if (ret) {
6409				mlog_errno(ret);
6410				goto out;
6411			}
6412
6413			BUG_ON(!p_cluster);
6414
6415			if (xv->xr_list.l_tree_depth) {
6416				ret = ocfs2_insert_extent(handle,
6417						&data_et, cpos,
6418						ocfs2_clusters_to_blocks(
6419							args->old_inode->i_sb,
6420							p_cluster),
6421						num_clusters, ext_flags,
6422						meta_ac);
6423				if (ret) {
6424					mlog_errno(ret);
6425					goto out;
6426				}
6427			}
6428
6429			ret = ocfs2_increase_refcount(handle, args->ref_ci,
6430						      args->ref_root_bh,
6431						      p_cluster, num_clusters,
6432						      meta_ac, args->dealloc);
6433			if (ret) {
6434				mlog_errno(ret);
6435				goto out;
6436			}
6437
6438			cpos += num_clusters;
6439		}
6440	}
6441
6442out:
6443	return ret;
6444}
6445
6446static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6447{
6448	int ret = 0, credits = 0;
6449	handle_t *handle;
6450	struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6451	struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6452	int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6453	int header_off = osb->sb->s_blocksize - inline_size;
6454	struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6455					(args->old_bh->b_data + header_off);
6456	struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6457					(args->new_bh->b_data + header_off);
6458	struct ocfs2_alloc_context *meta_ac = NULL;
6459	struct ocfs2_inode_info *new_oi;
6460	struct ocfs2_dinode *new_di;
6461	struct ocfs2_xattr_value_buf vb = {
6462		.vb_bh = args->new_bh,
6463		.vb_access = ocfs2_journal_access_di,
6464	};
6465
6466	ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6467						  &credits, &meta_ac);
6468	if (ret) {
6469		mlog_errno(ret);
6470		goto out;
6471	}
6472
6473	handle = ocfs2_start_trans(osb, credits);
6474	if (IS_ERR(handle)) {
6475		ret = PTR_ERR(handle);
6476		mlog_errno(ret);
6477		goto out;
6478	}
6479
6480	ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6481				      args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6482	if (ret) {
6483		mlog_errno(ret);
6484		goto out_commit;
6485	}
6486
6487	memcpy(args->new_bh->b_data + header_off,
6488	       args->old_bh->b_data + header_off, inline_size);
6489
6490	new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6491	new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6492
6493	ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6494					 args->new_bh, new_xh, &vb, meta_ac,
6495					 ocfs2_get_xattr_value_root, NULL);
6496	if (ret) {
6497		mlog_errno(ret);
6498		goto out_commit;
6499	}
6500
6501	new_oi = OCFS2_I(args->new_inode);
 
 
 
 
 
 
 
 
 
 
6502	spin_lock(&new_oi->ip_lock);
6503	new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6504	new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6505	spin_unlock(&new_oi->ip_lock);
6506
6507	ocfs2_journal_dirty(handle, args->new_bh);
6508
6509out_commit:
6510	ocfs2_commit_trans(osb, handle);
6511
6512out:
6513	if (meta_ac)
6514		ocfs2_free_alloc_context(meta_ac);
6515	return ret;
6516}
6517
6518static int ocfs2_create_empty_xattr_block(struct inode *inode,
6519					  struct buffer_head *fe_bh,
6520					  struct buffer_head **ret_bh,
6521					  int indexed)
6522{
6523	int ret;
6524	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6525	struct ocfs2_xattr_set_ctxt ctxt;
6526
6527	memset(&ctxt, 0, sizeof(ctxt));
6528	ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6529	if (ret < 0) {
6530		mlog_errno(ret);
6531		return ret;
6532	}
6533
6534	ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6535	if (IS_ERR(ctxt.handle)) {
6536		ret = PTR_ERR(ctxt.handle);
6537		mlog_errno(ret);
6538		goto out;
6539	}
6540
6541	trace_ocfs2_create_empty_xattr_block(
6542				(unsigned long long)fe_bh->b_blocknr, indexed);
6543	ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6544				       ret_bh);
6545	if (ret)
6546		mlog_errno(ret);
6547
6548	ocfs2_commit_trans(osb, ctxt.handle);
6549out:
6550	ocfs2_free_alloc_context(ctxt.meta_ac);
6551	return ret;
6552}
6553
6554static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6555				     struct buffer_head *blk_bh,
6556				     struct buffer_head *new_blk_bh)
6557{
6558	int ret = 0, credits = 0;
6559	handle_t *handle;
6560	struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6561	struct ocfs2_dinode *new_di;
6562	struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6563	int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6564	struct ocfs2_xattr_block *xb =
6565			(struct ocfs2_xattr_block *)blk_bh->b_data;
6566	struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6567	struct ocfs2_xattr_block *new_xb =
6568			(struct ocfs2_xattr_block *)new_blk_bh->b_data;
6569	struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6570	struct ocfs2_alloc_context *meta_ac;
6571	struct ocfs2_xattr_value_buf vb = {
6572		.vb_bh = new_blk_bh,
6573		.vb_access = ocfs2_journal_access_xb,
6574	};
6575
6576	ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6577						  &credits, &meta_ac);
6578	if (ret) {
6579		mlog_errno(ret);
6580		return ret;
6581	}
6582
6583	/* One more credits in case we need to add xattr flags in new inode. */
6584	handle = ocfs2_start_trans(osb, credits + 1);
6585	if (IS_ERR(handle)) {
6586		ret = PTR_ERR(handle);
6587		mlog_errno(ret);
6588		goto out;
6589	}
6590
6591	if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6592		ret = ocfs2_journal_access_di(handle,
6593					      INODE_CACHE(args->new_inode),
6594					      args->new_bh,
6595					      OCFS2_JOURNAL_ACCESS_WRITE);
6596		if (ret) {
6597			mlog_errno(ret);
6598			goto out_commit;
6599		}
6600	}
6601
6602	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6603				      new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6604	if (ret) {
6605		mlog_errno(ret);
6606		goto out_commit;
6607	}
6608
6609	memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6610	       osb->sb->s_blocksize - header_off);
6611
6612	ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6613					 new_blk_bh, new_xh, &vb, meta_ac,
6614					 ocfs2_get_xattr_value_root, NULL);
6615	if (ret) {
6616		mlog_errno(ret);
6617		goto out_commit;
6618	}
6619
6620	ocfs2_journal_dirty(handle, new_blk_bh);
6621
6622	if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6623		new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6624		spin_lock(&new_oi->ip_lock);
6625		new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6626		new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6627		spin_unlock(&new_oi->ip_lock);
6628
6629		ocfs2_journal_dirty(handle, args->new_bh);
6630	}
6631
6632out_commit:
6633	ocfs2_commit_trans(osb, handle);
6634
6635out:
6636	ocfs2_free_alloc_context(meta_ac);
6637	return ret;
6638}
6639
6640struct ocfs2_reflink_xattr_tree_args {
6641	struct ocfs2_xattr_reflink *reflink;
6642	struct buffer_head *old_blk_bh;
6643	struct buffer_head *new_blk_bh;
6644	struct ocfs2_xattr_bucket *old_bucket;
6645	struct ocfs2_xattr_bucket *new_bucket;
6646};
6647
6648/*
6649 * NOTE:
6650 * We have to handle the case that both old bucket and new bucket
6651 * will call this function to get the right ret_bh.
6652 * So The caller must give us the right bh.
6653 */
6654static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6655					struct buffer_head *bh,
6656					struct ocfs2_xattr_header *xh,
6657					int offset,
6658					struct ocfs2_xattr_value_root **xv,
6659					struct buffer_head **ret_bh,
6660					void *para)
6661{
6662	struct ocfs2_reflink_xattr_tree_args *args =
6663			(struct ocfs2_reflink_xattr_tree_args *)para;
6664	struct ocfs2_xattr_bucket *bucket;
6665
6666	if (bh == args->old_bucket->bu_bhs[0])
6667		bucket = args->old_bucket;
6668	else
6669		bucket = args->new_bucket;
6670
6671	return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6672					       xv, ret_bh);
6673}
6674
6675struct ocfs2_value_tree_metas {
6676	int num_metas;
6677	int credits;
6678	int num_recs;
6679};
6680
6681static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6682					struct buffer_head *bh,
6683					struct ocfs2_xattr_header *xh,
6684					int offset,
6685					struct ocfs2_xattr_value_root **xv,
6686					struct buffer_head **ret_bh,
6687					void *para)
6688{
6689	struct ocfs2_xattr_bucket *bucket =
6690				(struct ocfs2_xattr_bucket *)para;
6691
6692	return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6693					       xv, ret_bh);
6694}
6695
6696static int ocfs2_calc_value_tree_metas(struct inode *inode,
6697				      struct ocfs2_xattr_bucket *bucket,
6698				      void *para)
6699{
6700	struct ocfs2_value_tree_metas *metas =
6701			(struct ocfs2_value_tree_metas *)para;
6702	struct ocfs2_xattr_header *xh =
6703			(struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6704
6705	/* Add the credits for this bucket first. */
6706	metas->credits += bucket->bu_blocks;
6707	return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6708					xh, &metas->num_metas,
6709					&metas->credits, &metas->num_recs,
6710					ocfs2_value_tree_metas_in_bucket,
6711					bucket);
6712}
6713
6714/*
6715 * Given a xattr extent rec starting from blkno and having len clusters,
6716 * iterate all the buckets calculate how much metadata we need for reflinking
6717 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6718 */
6719static int ocfs2_lock_reflink_xattr_rec_allocators(
6720				struct ocfs2_reflink_xattr_tree_args *args,
6721				struct ocfs2_extent_tree *xt_et,
6722				u64 blkno, u32 len, int *credits,
6723				struct ocfs2_alloc_context **meta_ac,
6724				struct ocfs2_alloc_context **data_ac)
6725{
6726	int ret, num_free_extents;
6727	struct ocfs2_value_tree_metas metas;
6728	struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6729	struct ocfs2_refcount_block *rb;
6730
6731	memset(&metas, 0, sizeof(metas));
6732
6733	ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6734					  ocfs2_calc_value_tree_metas, &metas);
6735	if (ret) {
6736		mlog_errno(ret);
6737		goto out;
6738	}
6739
6740	*credits = metas.credits;
6741
6742	/*
6743	 * Calculate we need for refcount tree change.
6744	 *
6745	 * We need to add/modify num_recs in refcount tree, so just calculate
6746	 * an approximate number we need for refcount tree change.
6747	 * Sometimes we need to split the tree, and after split,  half recs
6748	 * will be moved to the new block, and a new block can only provide
6749	 * half number of recs. So we multiple new blocks by 2.
6750	 * In the end, we have to add credits for modifying the already
6751	 * existed refcount block.
6752	 */
6753	rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6754	metas.num_recs =
6755		(metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6756		 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6757	metas.num_metas += metas.num_recs;
6758	*credits += metas.num_recs +
6759		    metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6760	if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6761		*credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6762			    le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6763	else
6764		*credits += 1;
6765
6766	/* count in the xattr tree change. */
6767	num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6768	if (num_free_extents < 0) {
6769		ret = num_free_extents;
6770		mlog_errno(ret);
6771		goto out;
6772	}
6773
6774	if (num_free_extents < len)
6775		metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6776
6777	*credits += ocfs2_calc_extend_credits(osb->sb,
6778					      xt_et->et_root_el, len);
6779
6780	if (metas.num_metas) {
6781		ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6782							meta_ac);
6783		if (ret) {
6784			mlog_errno(ret);
6785			goto out;
6786		}
6787	}
6788
6789	if (len) {
6790		ret = ocfs2_reserve_clusters(osb, len, data_ac);
6791		if (ret)
6792			mlog_errno(ret);
6793	}
6794out:
6795	if (ret) {
6796		if (*meta_ac) {
6797			ocfs2_free_alloc_context(*meta_ac);
6798			meta_ac = NULL;
6799		}
6800	}
6801
6802	return ret;
6803}
6804
6805static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6806				u64 blkno, u64 new_blkno, u32 clusters,
6807				u32 *cpos, int num_buckets,
6808				struct ocfs2_alloc_context *meta_ac,
6809				struct ocfs2_alloc_context *data_ac,
6810				struct ocfs2_reflink_xattr_tree_args *args)
6811{
6812	int i, j, ret = 0;
6813	struct super_block *sb = args->reflink->old_inode->i_sb;
6814	int bpb = args->old_bucket->bu_blocks;
6815	struct ocfs2_xattr_value_buf vb = {
6816		.vb_access = ocfs2_journal_access,
6817	};
6818
6819	for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6820		ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6821		if (ret) {
6822			mlog_errno(ret);
6823			break;
6824		}
6825
6826		ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6827		if (ret) {
6828			mlog_errno(ret);
6829			break;
6830		}
6831
6832		ret = ocfs2_xattr_bucket_journal_access(handle,
6833						args->new_bucket,
6834						OCFS2_JOURNAL_ACCESS_CREATE);
6835		if (ret) {
6836			mlog_errno(ret);
6837			break;
6838		}
6839
6840		for (j = 0; j < bpb; j++)
6841			memcpy(bucket_block(args->new_bucket, j),
6842			       bucket_block(args->old_bucket, j),
6843			       sb->s_blocksize);
6844
6845		/*
6846		 * Record the start cpos so that we can use it to initialize
6847		 * our xattr tree we also set the xh_num_bucket for the new
6848		 * bucket.
6849		 */
6850		if (i == 0) {
6851			*cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6852					    xh_entries[0].xe_name_hash);
6853			bucket_xh(args->new_bucket)->xh_num_buckets =
6854				cpu_to_le16(num_buckets);
6855		}
6856
6857		ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6858
6859		ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6860					args->old_bucket->bu_bhs[0],
6861					bucket_xh(args->old_bucket),
6862					args->new_bucket->bu_bhs[0],
6863					bucket_xh(args->new_bucket),
6864					&vb, meta_ac,
6865					ocfs2_get_reflink_xattr_value_root,
6866					args);
6867		if (ret) {
6868			mlog_errno(ret);
6869			break;
6870		}
6871
6872		/*
6873		 * Re-access and dirty the bucket to calculate metaecc.
6874		 * Because we may extend the transaction in reflink_xattr_header
6875		 * which will let the already accessed block gone.
6876		 */
6877		ret = ocfs2_xattr_bucket_journal_access(handle,
6878						args->new_bucket,
6879						OCFS2_JOURNAL_ACCESS_WRITE);
6880		if (ret) {
6881			mlog_errno(ret);
6882			break;
6883		}
6884
6885		ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6886
6887		ocfs2_xattr_bucket_relse(args->old_bucket);
6888		ocfs2_xattr_bucket_relse(args->new_bucket);
6889	}
6890
6891	ocfs2_xattr_bucket_relse(args->old_bucket);
6892	ocfs2_xattr_bucket_relse(args->new_bucket);
6893	return ret;
6894}
6895
6896static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6897				struct inode *inode,
6898				struct ocfs2_reflink_xattr_tree_args *args,
6899				struct ocfs2_extent_tree *et,
6900				struct ocfs2_alloc_context *meta_ac,
6901				struct ocfs2_alloc_context *data_ac,
6902				u64 blkno, u32 cpos, u32 len)
6903{
6904	int ret, first_inserted = 0;
6905	u32 p_cluster, num_clusters, reflink_cpos = 0;
6906	u64 new_blkno;
6907	unsigned int num_buckets, reflink_buckets;
6908	unsigned int bpc =
6909		ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6910
6911	ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6912	if (ret) {
6913		mlog_errno(ret);
6914		goto out;
6915	}
6916	num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6917	ocfs2_xattr_bucket_relse(args->old_bucket);
6918
6919	while (len && num_buckets) {
6920		ret = ocfs2_claim_clusters(handle, data_ac,
6921					   1, &p_cluster, &num_clusters);
6922		if (ret) {
6923			mlog_errno(ret);
6924			goto out;
6925		}
6926
6927		new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6928		reflink_buckets = min(num_buckets, bpc * num_clusters);
6929
6930		ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6931						 new_blkno, num_clusters,
6932						 &reflink_cpos, reflink_buckets,
6933						 meta_ac, data_ac, args);
6934		if (ret) {
6935			mlog_errno(ret);
6936			goto out;
6937		}
6938
6939		/*
6940		 * For the 1st allocated cluster, we make it use the same cpos
6941		 * so that the xattr tree looks the same as the original one
6942		 * in the most case.
6943		 */
6944		if (!first_inserted) {
6945			reflink_cpos = cpos;
6946			first_inserted = 1;
6947		}
6948		ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6949					  num_clusters, 0, meta_ac);
6950		if (ret)
6951			mlog_errno(ret);
6952
6953		trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6954						  num_clusters, reflink_cpos);
6955
6956		len -= num_clusters;
6957		blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6958		num_buckets -= reflink_buckets;
6959	}
6960out:
6961	return ret;
6962}
6963
6964/*
6965 * Create the same xattr extent record in the new inode's xattr tree.
6966 */
6967static int ocfs2_reflink_xattr_rec(struct inode *inode,
6968				   struct buffer_head *root_bh,
6969				   u64 blkno,
6970				   u32 cpos,
6971				   u32 len,
6972				   void *para)
6973{
6974	int ret, credits = 0;
6975	handle_t *handle;
6976	struct ocfs2_reflink_xattr_tree_args *args =
6977			(struct ocfs2_reflink_xattr_tree_args *)para;
6978	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6979	struct ocfs2_alloc_context *meta_ac = NULL;
6980	struct ocfs2_alloc_context *data_ac = NULL;
6981	struct ocfs2_extent_tree et;
6982
6983	trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
6984
6985	ocfs2_init_xattr_tree_extent_tree(&et,
6986					  INODE_CACHE(args->reflink->new_inode),
6987					  args->new_blk_bh);
6988
6989	ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6990						      len, &credits,
6991						      &meta_ac, &data_ac);
6992	if (ret) {
6993		mlog_errno(ret);
6994		goto out;
6995	}
6996
6997	handle = ocfs2_start_trans(osb, credits);
6998	if (IS_ERR(handle)) {
6999		ret = PTR_ERR(handle);
7000		mlog_errno(ret);
7001		goto out;
7002	}
7003
7004	ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7005					  meta_ac, data_ac,
7006					  blkno, cpos, len);
7007	if (ret)
7008		mlog_errno(ret);
7009
7010	ocfs2_commit_trans(osb, handle);
7011
7012out:
7013	if (meta_ac)
7014		ocfs2_free_alloc_context(meta_ac);
7015	if (data_ac)
7016		ocfs2_free_alloc_context(data_ac);
7017	return ret;
7018}
7019
7020/*
7021 * Create reflinked xattr buckets.
7022 * We will add bucket one by one, and refcount all the xattrs in the bucket
7023 * if they are stored outside.
7024 */
7025static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7026				    struct buffer_head *blk_bh,
7027				    struct buffer_head *new_blk_bh)
7028{
7029	int ret;
7030	struct ocfs2_reflink_xattr_tree_args para;
7031
7032	memset(&para, 0, sizeof(para));
7033	para.reflink = args;
7034	para.old_blk_bh = blk_bh;
7035	para.new_blk_bh = new_blk_bh;
7036
7037	para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7038	if (!para.old_bucket) {
7039		mlog_errno(-ENOMEM);
7040		return -ENOMEM;
7041	}
7042
7043	para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7044	if (!para.new_bucket) {
7045		ret = -ENOMEM;
7046		mlog_errno(ret);
7047		goto out;
7048	}
7049
7050	ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7051					      ocfs2_reflink_xattr_rec,
7052					      &para);
7053	if (ret)
7054		mlog_errno(ret);
7055
7056out:
7057	ocfs2_xattr_bucket_free(para.old_bucket);
7058	ocfs2_xattr_bucket_free(para.new_bucket);
7059	return ret;
7060}
7061
7062static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7063					struct buffer_head *blk_bh)
7064{
7065	int ret, indexed = 0;
7066	struct buffer_head *new_blk_bh = NULL;
7067	struct ocfs2_xattr_block *xb =
7068			(struct ocfs2_xattr_block *)blk_bh->b_data;
7069
7070
7071	if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7072		indexed = 1;
7073
7074	ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7075					     &new_blk_bh, indexed);
7076	if (ret) {
7077		mlog_errno(ret);
7078		goto out;
7079	}
7080
7081	if (!indexed)
7082		ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7083	else
7084		ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7085	if (ret)
7086		mlog_errno(ret);
7087
7088out:
7089	brelse(new_blk_bh);
7090	return ret;
7091}
7092
7093static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7094{
7095	int type = ocfs2_xattr_get_type(xe);
7096
7097	return type != OCFS2_XATTR_INDEX_SECURITY &&
7098	       type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7099	       type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7100}
7101
7102int ocfs2_reflink_xattrs(struct inode *old_inode,
7103			 struct buffer_head *old_bh,
7104			 struct inode *new_inode,
7105			 struct buffer_head *new_bh,
7106			 bool preserve_security)
7107{
7108	int ret;
7109	struct ocfs2_xattr_reflink args;
7110	struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7111	struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7112	struct buffer_head *blk_bh = NULL;
7113	struct ocfs2_cached_dealloc_ctxt dealloc;
7114	struct ocfs2_refcount_tree *ref_tree;
7115	struct buffer_head *ref_root_bh = NULL;
7116
7117	ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7118				       le64_to_cpu(di->i_refcount_loc),
7119				       1, &ref_tree, &ref_root_bh);
7120	if (ret) {
7121		mlog_errno(ret);
7122		goto out;
7123	}
7124
7125	ocfs2_init_dealloc_ctxt(&dealloc);
7126
7127	args.old_inode = old_inode;
7128	args.new_inode = new_inode;
7129	args.old_bh = old_bh;
7130	args.new_bh = new_bh;
7131	args.ref_ci = &ref_tree->rf_ci;
7132	args.ref_root_bh = ref_root_bh;
7133	args.dealloc = &dealloc;
7134	if (preserve_security)
7135		args.xattr_reflinked = NULL;
7136	else
7137		args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7138
7139	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7140		ret = ocfs2_reflink_xattr_inline(&args);
7141		if (ret) {
7142			mlog_errno(ret);
7143			goto out_unlock;
7144		}
7145	}
7146
7147	if (!di->i_xattr_loc)
7148		goto out_unlock;
7149
7150	ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7151				     &blk_bh);
7152	if (ret < 0) {
7153		mlog_errno(ret);
7154		goto out_unlock;
7155	}
7156
7157	ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7158	if (ret)
7159		mlog_errno(ret);
7160
7161	brelse(blk_bh);
7162
7163out_unlock:
7164	ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7165				   ref_tree, 1);
7166	brelse(ref_root_bh);
7167
7168	if (ocfs2_dealloc_has_cluster(&dealloc)) {
7169		ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7170		ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7171	}
7172
7173out:
7174	return ret;
7175}
7176
7177/*
7178 * Initialize security and acl for a already created inode.
7179 * Used for reflink a non-preserve-security file.
7180 *
7181 * It uses common api like ocfs2_xattr_set, so the caller
7182 * must not hold any lock expect i_mutex.
7183 */
7184int ocfs2_init_security_and_acl(struct inode *dir,
7185				struct inode *inode,
7186				const struct qstr *qstr)
7187{
7188	int ret = 0;
7189	struct buffer_head *dir_bh = NULL;
7190
7191	ret = ocfs2_init_security_get(inode, dir, qstr, NULL);
7192	if (!ret) {
7193		mlog_errno(ret);
7194		goto leave;
7195	}
7196
7197	ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7198	if (ret) {
7199		mlog_errno(ret);
7200		goto leave;
7201	}
7202
7203	ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7204	if (ret)
7205		mlog_errno(ret);
7206
7207	ocfs2_inode_unlock(dir, 0);
7208	brelse(dir_bh);
7209leave:
7210	return ret;
7211}
 
7212/*
7213 * 'security' attributes support
7214 */
7215static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7216					size_t list_size, const char *name,
7217					size_t name_len, int type)
7218{
7219	const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7220	const size_t total_len = prefix_len + name_len + 1;
7221
7222	if (list && total_len <= list_size) {
7223		memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7224		memcpy(list + prefix_len, name, name_len);
7225		list[prefix_len + name_len] = '\0';
7226	}
7227	return total_len;
7228}
7229
7230static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7231				    void *buffer, size_t size, int type)
7232{
7233	if (strcmp(name, "") == 0)
7234		return -EINVAL;
7235	return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7236			       name, buffer, size);
7237}
7238
7239static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7240		const void *value, size_t size, int flags, int type)
 
 
7241{
7242	if (strcmp(name, "") == 0)
7243		return -EINVAL;
7244
7245	return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7246			       name, value, size, flags);
7247}
7248
7249int ocfs2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
7250		     void *fs_info)
7251{
7252	const struct xattr *xattr;
7253	int err = 0;
7254
7255	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
7256		err = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7257				      xattr->name, xattr->value,
7258				      xattr->value_len, XATTR_CREATE);
7259		if (err)
7260			break;
7261	}
7262	return err;
7263}
7264
7265int ocfs2_init_security_get(struct inode *inode,
7266			    struct inode *dir,
7267			    const struct qstr *qstr,
7268			    struct ocfs2_security_xattr_info *si)
7269{
7270	/* check whether ocfs2 support feature xattr */
7271	if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7272		return -EOPNOTSUPP;
7273	if (si)
7274		return security_old_inode_init_security(inode, dir, qstr,
7275							&si->name, &si->value,
7276							&si->value_len);
7277
7278	return security_inode_init_security(inode, dir, qstr,
7279					    &ocfs2_initxattrs, NULL);
7280}
7281
7282int ocfs2_init_security_set(handle_t *handle,
7283			    struct inode *inode,
7284			    struct buffer_head *di_bh,
7285			    struct ocfs2_security_xattr_info *si,
7286			    struct ocfs2_alloc_context *xattr_ac,
7287			    struct ocfs2_alloc_context *data_ac)
7288{
7289	return ocfs2_xattr_set_handle(handle, inode, di_bh,
7290				     OCFS2_XATTR_INDEX_SECURITY,
7291				     si->name, si->value, si->value_len, 0,
7292				     xattr_ac, data_ac);
7293}
7294
7295const struct xattr_handler ocfs2_xattr_security_handler = {
7296	.prefix	= XATTR_SECURITY_PREFIX,
7297	.list	= ocfs2_xattr_security_list,
7298	.get	= ocfs2_xattr_security_get,
7299	.set	= ocfs2_xattr_security_set,
7300};
7301
7302/*
7303 * 'trusted' attributes support
7304 */
7305static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7306				       size_t list_size, const char *name,
7307				       size_t name_len, int type)
7308{
7309	const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7310	const size_t total_len = prefix_len + name_len + 1;
7311
7312	if (list && total_len <= list_size) {
7313		memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7314		memcpy(list + prefix_len, name, name_len);
7315		list[prefix_len + name_len] = '\0';
7316	}
7317	return total_len;
7318}
7319
7320static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7321		void *buffer, size_t size, int type)
7322{
7323	if (strcmp(name, "") == 0)
7324		return -EINVAL;
7325	return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7326			       name, buffer, size);
7327}
7328
7329static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7330		const void *value, size_t size, int flags, int type)
 
 
7331{
7332	if (strcmp(name, "") == 0)
7333		return -EINVAL;
7334
7335	return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7336			       name, value, size, flags);
7337}
7338
7339const struct xattr_handler ocfs2_xattr_trusted_handler = {
7340	.prefix	= XATTR_TRUSTED_PREFIX,
7341	.list	= ocfs2_xattr_trusted_list,
7342	.get	= ocfs2_xattr_trusted_get,
7343	.set	= ocfs2_xattr_trusted_set,
7344};
7345
7346/*
7347 * 'user' attributes support
7348 */
7349static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7350				    size_t list_size, const char *name,
7351				    size_t name_len, int type)
7352{
7353	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7354	const size_t total_len = prefix_len + name_len + 1;
7355	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7356
7357	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7358		return 0;
7359
7360	if (list && total_len <= list_size) {
7361		memcpy(list, XATTR_USER_PREFIX, prefix_len);
7362		memcpy(list + prefix_len, name, name_len);
7363		list[prefix_len + name_len] = '\0';
7364	}
7365	return total_len;
7366}
7367
7368static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7369		void *buffer, size_t size, int type)
7370{
7371	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7372
7373	if (strcmp(name, "") == 0)
7374		return -EINVAL;
7375	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7376		return -EOPNOTSUPP;
7377	return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7378			       buffer, size);
7379}
7380
7381static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7382		const void *value, size_t size, int flags, int type)
 
 
7383{
7384	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7385
7386	if (strcmp(name, "") == 0)
7387		return -EINVAL;
7388	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7389		return -EOPNOTSUPP;
7390
7391	return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7392			       name, value, size, flags);
7393}
7394
7395const struct xattr_handler ocfs2_xattr_user_handler = {
7396	.prefix	= XATTR_USER_PREFIX,
7397	.list	= ocfs2_xattr_user_list,
7398	.get	= ocfs2_xattr_user_get,
7399	.set	= ocfs2_xattr_user_set,
7400};