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			  int 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		if (ret < 0) {
2380			mlog_errno(ret);
2381			break;
2382		}
2383
2384		ocfs2_commit_trans(osb, ctxt.handle);
2385		if (ctxt.meta_ac) {
2386			ocfs2_free_alloc_context(ctxt.meta_ac);
2387			ctxt.meta_ac = NULL;
2388		}
 
 
 
 
 
 
2389	}
2390
2391	if (ctxt.meta_ac)
2392		ocfs2_free_alloc_context(ctxt.meta_ac);
2393	ocfs2_schedule_truncate_log_flush(osb, 1);
2394	ocfs2_run_deallocs(osb, &ctxt.dealloc);
2395	return ret;
2396}
2397
2398static int ocfs2_xattr_ibody_remove(struct inode *inode,
2399				    struct buffer_head *di_bh,
2400				    struct ocfs2_caching_info *ref_ci,
2401				    struct buffer_head *ref_root_bh)
2402{
2403
2404	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2405	struct ocfs2_xattr_header *header;
2406	int ret;
2407	struct ocfs2_xattr_value_buf vb = {
2408		.vb_bh = di_bh,
2409		.vb_access = ocfs2_journal_access_di,
2410	};
2411
2412	header = (struct ocfs2_xattr_header *)
2413		 ((void *)di + inode->i_sb->s_blocksize -
2414		 le16_to_cpu(di->i_xattr_inline_size));
2415
2416	ret = ocfs2_remove_value_outside(inode, &vb, header,
2417					 ref_ci, ref_root_bh);
2418
2419	return ret;
2420}
2421
2422struct ocfs2_rm_xattr_bucket_para {
2423	struct ocfs2_caching_info *ref_ci;
2424	struct buffer_head *ref_root_bh;
2425};
2426
2427static int ocfs2_xattr_block_remove(struct inode *inode,
2428				    struct buffer_head *blk_bh,
2429				    struct ocfs2_caching_info *ref_ci,
2430				    struct buffer_head *ref_root_bh)
2431{
2432	struct ocfs2_xattr_block *xb;
2433	int ret = 0;
2434	struct ocfs2_xattr_value_buf vb = {
2435		.vb_bh = blk_bh,
2436		.vb_access = ocfs2_journal_access_xb,
2437	};
2438	struct ocfs2_rm_xattr_bucket_para args = {
2439		.ref_ci = ref_ci,
2440		.ref_root_bh = ref_root_bh,
2441	};
2442
2443	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2444	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2445		struct ocfs2_xattr_header *header = &(xb->xb_attrs.xb_header);
2446		ret = ocfs2_remove_value_outside(inode, &vb, header,
2447						 ref_ci, ref_root_bh);
2448	} else
2449		ret = ocfs2_iterate_xattr_index_block(inode,
2450						blk_bh,
2451						ocfs2_rm_xattr_cluster,
2452						&args);
2453
2454	return ret;
2455}
2456
2457static int ocfs2_xattr_free_block(struct inode *inode,
2458				  u64 block,
2459				  struct ocfs2_caching_info *ref_ci,
2460				  struct buffer_head *ref_root_bh)
2461{
2462	struct inode *xb_alloc_inode;
2463	struct buffer_head *xb_alloc_bh = NULL;
2464	struct buffer_head *blk_bh = NULL;
2465	struct ocfs2_xattr_block *xb;
2466	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2467	handle_t *handle;
2468	int ret = 0;
2469	u64 blk, bg_blkno;
2470	u16 bit;
2471
2472	ret = ocfs2_read_xattr_block(inode, block, &blk_bh);
2473	if (ret < 0) {
2474		mlog_errno(ret);
2475		goto out;
2476	}
2477
2478	ret = ocfs2_xattr_block_remove(inode, blk_bh, ref_ci, ref_root_bh);
2479	if (ret < 0) {
2480		mlog_errno(ret);
2481		goto out;
2482	}
2483
2484	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2485	blk = le64_to_cpu(xb->xb_blkno);
2486	bit = le16_to_cpu(xb->xb_suballoc_bit);
2487	if (xb->xb_suballoc_loc)
2488		bg_blkno = le64_to_cpu(xb->xb_suballoc_loc);
2489	else
2490		bg_blkno = ocfs2_which_suballoc_group(blk, bit);
2491
2492	xb_alloc_inode = ocfs2_get_system_file_inode(osb,
2493				EXTENT_ALLOC_SYSTEM_INODE,
2494				le16_to_cpu(xb->xb_suballoc_slot));
2495	if (!xb_alloc_inode) {
2496		ret = -ENOMEM;
2497		mlog_errno(ret);
2498		goto out;
2499	}
2500	mutex_lock(&xb_alloc_inode->i_mutex);
2501
2502	ret = ocfs2_inode_lock(xb_alloc_inode, &xb_alloc_bh, 1);
2503	if (ret < 0) {
2504		mlog_errno(ret);
2505		goto out_mutex;
2506	}
2507
2508	handle = ocfs2_start_trans(osb, OCFS2_SUBALLOC_FREE);
2509	if (IS_ERR(handle)) {
2510		ret = PTR_ERR(handle);
2511		mlog_errno(ret);
2512		goto out_unlock;
2513	}
2514
2515	ret = ocfs2_free_suballoc_bits(handle, xb_alloc_inode, xb_alloc_bh,
2516				       bit, bg_blkno, 1);
2517	if (ret < 0)
2518		mlog_errno(ret);
2519
2520	ocfs2_commit_trans(osb, handle);
2521out_unlock:
2522	ocfs2_inode_unlock(xb_alloc_inode, 1);
2523	brelse(xb_alloc_bh);
2524out_mutex:
2525	mutex_unlock(&xb_alloc_inode->i_mutex);
2526	iput(xb_alloc_inode);
2527out:
2528	brelse(blk_bh);
2529	return ret;
2530}
2531
2532/*
2533 * ocfs2_xattr_remove()
2534 *
2535 * Free extended attribute resources associated with this inode.
2536 */
2537int ocfs2_xattr_remove(struct inode *inode, struct buffer_head *di_bh)
2538{
2539	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2540	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2541	struct ocfs2_refcount_tree *ref_tree = NULL;
2542	struct buffer_head *ref_root_bh = NULL;
2543	struct ocfs2_caching_info *ref_ci = NULL;
2544	handle_t *handle;
2545	int ret;
2546
2547	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
2548		return 0;
2549
2550	if (!(oi->ip_dyn_features & OCFS2_HAS_XATTR_FL))
2551		return 0;
2552
2553	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
2554		ret = ocfs2_lock_refcount_tree(OCFS2_SB(inode->i_sb),
2555					       le64_to_cpu(di->i_refcount_loc),
2556					       1, &ref_tree, &ref_root_bh);
2557		if (ret) {
2558			mlog_errno(ret);
2559			goto out;
2560		}
2561		ref_ci = &ref_tree->rf_ci;
2562
2563	}
2564
2565	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2566		ret = ocfs2_xattr_ibody_remove(inode, di_bh,
2567					       ref_ci, ref_root_bh);
2568		if (ret < 0) {
2569			mlog_errno(ret);
2570			goto out;
2571		}
2572	}
2573
2574	if (di->i_xattr_loc) {
2575		ret = ocfs2_xattr_free_block(inode,
2576					     le64_to_cpu(di->i_xattr_loc),
2577					     ref_ci, ref_root_bh);
2578		if (ret < 0) {
2579			mlog_errno(ret);
2580			goto out;
2581		}
2582	}
2583
2584	handle = ocfs2_start_trans((OCFS2_SB(inode->i_sb)),
2585				   OCFS2_INODE_UPDATE_CREDITS);
2586	if (IS_ERR(handle)) {
2587		ret = PTR_ERR(handle);
2588		mlog_errno(ret);
2589		goto out;
2590	}
2591	ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
2592				      OCFS2_JOURNAL_ACCESS_WRITE);
2593	if (ret) {
2594		mlog_errno(ret);
2595		goto out_commit;
2596	}
2597
2598	di->i_xattr_loc = 0;
2599
2600	spin_lock(&oi->ip_lock);
2601	oi->ip_dyn_features &= ~(OCFS2_INLINE_XATTR_FL | OCFS2_HAS_XATTR_FL);
2602	di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2603	spin_unlock(&oi->ip_lock);
 
2604
2605	ocfs2_journal_dirty(handle, di_bh);
2606out_commit:
2607	ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
2608out:
2609	if (ref_tree)
2610		ocfs2_unlock_refcount_tree(OCFS2_SB(inode->i_sb), ref_tree, 1);
2611	brelse(ref_root_bh);
2612	return ret;
2613}
2614
2615static int ocfs2_xattr_has_space_inline(struct inode *inode,
2616					struct ocfs2_dinode *di)
2617{
2618	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2619	unsigned int xattrsize = OCFS2_SB(inode->i_sb)->s_xattr_inline_size;
2620	int free;
2621
2622	if (xattrsize < OCFS2_MIN_XATTR_INLINE_SIZE)
2623		return 0;
2624
2625	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2626		struct ocfs2_inline_data *idata = &di->id2.i_data;
2627		free = le16_to_cpu(idata->id_count) - le64_to_cpu(di->i_size);
2628	} else if (ocfs2_inode_is_fast_symlink(inode)) {
2629		free = ocfs2_fast_symlink_chars(inode->i_sb) -
2630			le64_to_cpu(di->i_size);
2631	} else {
2632		struct ocfs2_extent_list *el = &di->id2.i_list;
2633		free = (le16_to_cpu(el->l_count) -
2634			le16_to_cpu(el->l_next_free_rec)) *
2635			sizeof(struct ocfs2_extent_rec);
2636	}
2637	if (free >= xattrsize)
2638		return 1;
2639
2640	return 0;
2641}
2642
2643/*
2644 * ocfs2_xattr_ibody_find()
2645 *
2646 * Find extended attribute in inode block and
2647 * fill search info into struct ocfs2_xattr_search.
2648 */
2649static int ocfs2_xattr_ibody_find(struct inode *inode,
2650				  int name_index,
2651				  const char *name,
2652				  struct ocfs2_xattr_search *xs)
2653{
2654	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2655	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2656	int ret;
2657	int has_space = 0;
2658
2659	if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2660		return 0;
2661
2662	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2663		down_read(&oi->ip_alloc_sem);
2664		has_space = ocfs2_xattr_has_space_inline(inode, di);
2665		up_read(&oi->ip_alloc_sem);
2666		if (!has_space)
2667			return 0;
2668	}
2669
2670	xs->xattr_bh = xs->inode_bh;
2671	xs->end = (void *)di + inode->i_sb->s_blocksize;
2672	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)
2673		xs->header = (struct ocfs2_xattr_header *)
2674			(xs->end - le16_to_cpu(di->i_xattr_inline_size));
2675	else
2676		xs->header = (struct ocfs2_xattr_header *)
2677			(xs->end - OCFS2_SB(inode->i_sb)->s_xattr_inline_size);
2678	xs->base = (void *)xs->header;
2679	xs->here = xs->header->xh_entries;
2680
2681	/* Find the named attribute. */
2682	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
2683		ret = ocfs2_xattr_find_entry(name_index, name, xs);
2684		if (ret && ret != -ENODATA)
2685			return ret;
2686		xs->not_found = ret;
2687	}
2688
2689	return 0;
2690}
2691
2692static int ocfs2_xattr_ibody_init(struct inode *inode,
2693				  struct buffer_head *di_bh,
2694				  struct ocfs2_xattr_set_ctxt *ctxt)
2695{
2696	int ret;
2697	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2698	struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
2699	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
2700	unsigned int xattrsize = osb->s_xattr_inline_size;
2701
2702	if (!ocfs2_xattr_has_space_inline(inode, di)) {
2703		ret = -ENOSPC;
2704		goto out;
2705	}
2706
2707	ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode), di_bh,
2708				      OCFS2_JOURNAL_ACCESS_WRITE);
2709	if (ret) {
2710		mlog_errno(ret);
2711		goto out;
2712	}
2713
2714	/*
2715	 * Adjust extent record count or inline data size
2716	 * to reserve space for extended attribute.
2717	 */
2718	if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2719		struct ocfs2_inline_data *idata = &di->id2.i_data;
2720		le16_add_cpu(&idata->id_count, -xattrsize);
2721	} else if (!(ocfs2_inode_is_fast_symlink(inode))) {
2722		struct ocfs2_extent_list *el = &di->id2.i_list;
2723		le16_add_cpu(&el->l_count, -(xattrsize /
2724					     sizeof(struct ocfs2_extent_rec)));
2725	}
2726	di->i_xattr_inline_size = cpu_to_le16(xattrsize);
2727
2728	spin_lock(&oi->ip_lock);
2729	oi->ip_dyn_features |= OCFS2_INLINE_XATTR_FL|OCFS2_HAS_XATTR_FL;
2730	di->i_dyn_features = cpu_to_le16(oi->ip_dyn_features);
2731	spin_unlock(&oi->ip_lock);
2732
2733	ocfs2_journal_dirty(ctxt->handle, di_bh);
2734
2735out:
2736	return ret;
2737}
2738
2739/*
2740 * ocfs2_xattr_ibody_set()
2741 *
2742 * Set, replace or remove an extended attribute into inode block.
2743 *
2744 */
2745static int ocfs2_xattr_ibody_set(struct inode *inode,
2746				 struct ocfs2_xattr_info *xi,
2747				 struct ocfs2_xattr_search *xs,
2748				 struct ocfs2_xattr_set_ctxt *ctxt)
2749{
2750	int ret;
2751	struct ocfs2_inode_info *oi = OCFS2_I(inode);
2752	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2753	struct ocfs2_xa_loc loc;
2754
2755	if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE)
2756		return -ENOSPC;
2757
2758	down_write(&oi->ip_alloc_sem);
2759	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2760		if (!ocfs2_xattr_has_space_inline(inode, di)) {
2761			ret = -ENOSPC;
2762			goto out;
2763		}
2764	}
2765
2766	if (!(oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL)) {
2767		ret = ocfs2_xattr_ibody_init(inode, xs->inode_bh, ctxt);
2768		if (ret) {
2769			if (ret != -ENOSPC)
2770				mlog_errno(ret);
2771			goto out;
2772		}
2773	}
2774
2775	ocfs2_init_dinode_xa_loc(&loc, inode, xs->inode_bh,
2776				 xs->not_found ? NULL : xs->here);
2777	ret = ocfs2_xa_set(&loc, xi, ctxt);
2778	if (ret) {
2779		if (ret != -ENOSPC)
2780			mlog_errno(ret);
2781		goto out;
2782	}
2783	xs->here = loc.xl_entry;
2784
2785out:
2786	up_write(&oi->ip_alloc_sem);
2787
2788	return ret;
2789}
2790
2791/*
2792 * ocfs2_xattr_block_find()
2793 *
2794 * Find extended attribute in external block and
2795 * fill search info into struct ocfs2_xattr_search.
2796 */
2797static int ocfs2_xattr_block_find(struct inode *inode,
2798				  int name_index,
2799				  const char *name,
2800				  struct ocfs2_xattr_search *xs)
2801{
2802	struct ocfs2_dinode *di = (struct ocfs2_dinode *)xs->inode_bh->b_data;
2803	struct buffer_head *blk_bh = NULL;
2804	struct ocfs2_xattr_block *xb;
2805	int ret = 0;
2806
2807	if (!di->i_xattr_loc)
2808		return ret;
2809
2810	ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
2811				     &blk_bh);
2812	if (ret < 0) {
2813		mlog_errno(ret);
2814		return ret;
2815	}
2816
2817	xs->xattr_bh = blk_bh;
2818	xb = (struct ocfs2_xattr_block *)blk_bh->b_data;
2819
2820	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
2821		xs->header = &xb->xb_attrs.xb_header;
2822		xs->base = (void *)xs->header;
2823		xs->end = (void *)(blk_bh->b_data) + blk_bh->b_size;
2824		xs->here = xs->header->xh_entries;
2825
2826		ret = ocfs2_xattr_find_entry(name_index, name, xs);
2827	} else
2828		ret = ocfs2_xattr_index_block_find(inode, blk_bh,
2829						   name_index,
2830						   name, xs);
2831
2832	if (ret && ret != -ENODATA) {
2833		xs->xattr_bh = NULL;
2834		goto cleanup;
2835	}
2836	xs->not_found = ret;
2837	return 0;
2838cleanup:
2839	brelse(blk_bh);
2840
2841	return ret;
2842}
2843
2844static int ocfs2_create_xattr_block(struct inode *inode,
2845				    struct buffer_head *inode_bh,
2846				    struct ocfs2_xattr_set_ctxt *ctxt,
2847				    int indexed,
2848				    struct buffer_head **ret_bh)
2849{
2850	int ret;
2851	u16 suballoc_bit_start;
2852	u32 num_got;
2853	u64 suballoc_loc, first_blkno;
2854	struct ocfs2_dinode *di =  (struct ocfs2_dinode *)inode_bh->b_data;
2855	struct buffer_head *new_bh = NULL;
2856	struct ocfs2_xattr_block *xblk;
2857
2858	ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
2859				      inode_bh, OCFS2_JOURNAL_ACCESS_CREATE);
2860	if (ret < 0) {
2861		mlog_errno(ret);
2862		goto end;
2863	}
2864
2865	ret = ocfs2_claim_metadata(ctxt->handle, ctxt->meta_ac, 1,
2866				   &suballoc_loc, &suballoc_bit_start,
2867				   &num_got, &first_blkno);
2868	if (ret < 0) {
2869		mlog_errno(ret);
2870		goto end;
2871	}
2872
2873	new_bh = sb_getblk(inode->i_sb, first_blkno);
 
 
 
 
 
 
2874	ocfs2_set_new_buffer_uptodate(INODE_CACHE(inode), new_bh);
2875
2876	ret = ocfs2_journal_access_xb(ctxt->handle, INODE_CACHE(inode),
2877				      new_bh,
2878				      OCFS2_JOURNAL_ACCESS_CREATE);
2879	if (ret < 0) {
2880		mlog_errno(ret);
2881		goto end;
2882	}
2883
2884	/* Initialize ocfs2_xattr_block */
2885	xblk = (struct ocfs2_xattr_block *)new_bh->b_data;
2886	memset(xblk, 0, inode->i_sb->s_blocksize);
2887	strcpy((void *)xblk, OCFS2_XATTR_BLOCK_SIGNATURE);
2888	xblk->xb_suballoc_slot = cpu_to_le16(ctxt->meta_ac->ac_alloc_slot);
2889	xblk->xb_suballoc_loc = cpu_to_le64(suballoc_loc);
2890	xblk->xb_suballoc_bit = cpu_to_le16(suballoc_bit_start);
2891	xblk->xb_fs_generation =
2892		cpu_to_le32(OCFS2_SB(inode->i_sb)->fs_generation);
2893	xblk->xb_blkno = cpu_to_le64(first_blkno);
2894	if (indexed) {
2895		struct ocfs2_xattr_tree_root *xr = &xblk->xb_attrs.xb_root;
2896		xr->xt_clusters = cpu_to_le32(1);
2897		xr->xt_last_eb_blk = 0;
2898		xr->xt_list.l_tree_depth = 0;
2899		xr->xt_list.l_count = cpu_to_le16(
2900					ocfs2_xattr_recs_per_xb(inode->i_sb));
2901		xr->xt_list.l_next_free_rec = cpu_to_le16(1);
2902		xblk->xb_flags = cpu_to_le16(OCFS2_XATTR_INDEXED);
2903	}
2904	ocfs2_journal_dirty(ctxt->handle, new_bh);
2905
2906	/* Add it to the inode */
2907	di->i_xattr_loc = cpu_to_le64(first_blkno);
2908
2909	spin_lock(&OCFS2_I(inode)->ip_lock);
2910	OCFS2_I(inode)->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
2911	di->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
2912	spin_unlock(&OCFS2_I(inode)->ip_lock);
2913
2914	ocfs2_journal_dirty(ctxt->handle, inode_bh);
2915
2916	*ret_bh = new_bh;
2917	new_bh = NULL;
2918
2919end:
2920	brelse(new_bh);
2921	return ret;
2922}
2923
2924/*
2925 * ocfs2_xattr_block_set()
2926 *
2927 * Set, replace or remove an extended attribute into external block.
2928 *
2929 */
2930static int ocfs2_xattr_block_set(struct inode *inode,
2931				 struct ocfs2_xattr_info *xi,
2932				 struct ocfs2_xattr_search *xs,
2933				 struct ocfs2_xattr_set_ctxt *ctxt)
2934{
2935	struct buffer_head *new_bh = NULL;
2936	struct ocfs2_xattr_block *xblk = NULL;
2937	int ret;
2938	struct ocfs2_xa_loc loc;
2939
2940	if (!xs->xattr_bh) {
2941		ret = ocfs2_create_xattr_block(inode, xs->inode_bh, ctxt,
2942					       0, &new_bh);
2943		if (ret) {
2944			mlog_errno(ret);
2945			goto end;
2946		}
2947
2948		xs->xattr_bh = new_bh;
2949		xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2950		xs->header = &xblk->xb_attrs.xb_header;
2951		xs->base = (void *)xs->header;
2952		xs->end = (void *)xblk + inode->i_sb->s_blocksize;
2953		xs->here = xs->header->xh_entries;
2954	} else
2955		xblk = (struct ocfs2_xattr_block *)xs->xattr_bh->b_data;
2956
2957	if (!(le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)) {
2958		ocfs2_init_xattr_block_xa_loc(&loc, inode, xs->xattr_bh,
2959					      xs->not_found ? NULL : xs->here);
2960
2961		ret = ocfs2_xa_set(&loc, xi, ctxt);
2962		if (!ret)
2963			xs->here = loc.xl_entry;
2964		else if ((ret != -ENOSPC) || ctxt->set_abort)
2965			goto end;
2966		else {
2967			ret = ocfs2_xattr_create_index_block(inode, xs, ctxt);
2968			if (ret)
2969				goto end;
2970		}
2971	}
2972
2973	if (le16_to_cpu(xblk->xb_flags) & OCFS2_XATTR_INDEXED)
2974		ret = ocfs2_xattr_set_entry_index_block(inode, xi, xs, ctxt);
2975
2976end:
2977	return ret;
2978}
2979
2980/* Check whether the new xattr can be inserted into the inode. */
2981static int ocfs2_xattr_can_be_in_inode(struct inode *inode,
2982				       struct ocfs2_xattr_info *xi,
2983				       struct ocfs2_xattr_search *xs)
2984{
2985	struct ocfs2_xattr_entry *last;
2986	int free, i;
2987	size_t min_offs = xs->end - xs->base;
2988
2989	if (!xs->header)
2990		return 0;
2991
2992	last = xs->header->xh_entries;
2993
2994	for (i = 0; i < le16_to_cpu(xs->header->xh_count); i++) {
2995		size_t offs = le16_to_cpu(last->xe_name_offset);
2996		if (offs < min_offs)
2997			min_offs = offs;
2998		last += 1;
2999	}
3000
3001	free = min_offs - ((void *)last - xs->base) - OCFS2_XATTR_HEADER_GAP;
3002	if (free < 0)
3003		return 0;
3004
3005	BUG_ON(!xs->not_found);
3006
3007	if (free >= (sizeof(struct ocfs2_xattr_entry) + namevalue_size_xi(xi)))
3008		return 1;
3009
3010	return 0;
3011}
3012
3013static int ocfs2_calc_xattr_set_need(struct inode *inode,
3014				     struct ocfs2_dinode *di,
3015				     struct ocfs2_xattr_info *xi,
3016				     struct ocfs2_xattr_search *xis,
3017				     struct ocfs2_xattr_search *xbs,
3018				     int *clusters_need,
3019				     int *meta_need,
3020				     int *credits_need)
3021{
3022	int ret = 0, old_in_xb = 0;
3023	int clusters_add = 0, meta_add = 0, credits = 0;
3024	struct buffer_head *bh = NULL;
3025	struct ocfs2_xattr_block *xb = NULL;
3026	struct ocfs2_xattr_entry *xe = NULL;
3027	struct ocfs2_xattr_value_root *xv = NULL;
3028	char *base = NULL;
3029	int name_offset, name_len = 0;
3030	u32 new_clusters = ocfs2_clusters_for_bytes(inode->i_sb,
3031						    xi->xi_value_len);
3032	u64 value_size;
3033
3034	/*
3035	 * Calculate the clusters we need to write.
3036	 * No matter whether we replace an old one or add a new one,
3037	 * we need this for writing.
3038	 */
3039	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE)
3040		credits += new_clusters *
3041			   ocfs2_clusters_to_blocks(inode->i_sb, 1);
3042
3043	if (xis->not_found && xbs->not_found) {
3044		credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3045
3046		if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3047			clusters_add += new_clusters;
3048			credits += ocfs2_calc_extend_credits(inode->i_sb,
3049							&def_xv.xv.xr_list,
3050							new_clusters);
3051		}
3052
3053		goto meta_guess;
3054	}
3055
3056	if (!xis->not_found) {
3057		xe = xis->here;
3058		name_offset = le16_to_cpu(xe->xe_name_offset);
3059		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3060		base = xis->base;
3061		credits += OCFS2_INODE_UPDATE_CREDITS;
3062	} else {
3063		int i, block_off = 0;
3064		xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3065		xe = xbs->here;
3066		name_offset = le16_to_cpu(xe->xe_name_offset);
3067		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
3068		i = xbs->here - xbs->header->xh_entries;
3069		old_in_xb = 1;
3070
3071		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3072			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3073							bucket_xh(xbs->bucket),
3074							i, &block_off,
3075							&name_offset);
3076			base = bucket_block(xbs->bucket, block_off);
3077			credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3078		} else {
3079			base = xbs->base;
3080			credits += OCFS2_XATTR_BLOCK_UPDATE_CREDITS;
3081		}
3082	}
3083
3084	/*
3085	 * delete a xattr doesn't need metadata and cluster allocation.
3086	 * so just calculate the credits and return.
3087	 *
3088	 * The credits for removing the value tree will be extended
3089	 * by ocfs2_remove_extent itself.
3090	 */
3091	if (!xi->xi_value) {
3092		if (!ocfs2_xattr_is_local(xe))
3093			credits += ocfs2_remove_extent_credits(inode->i_sb);
3094
3095		goto out;
3096	}
3097
3098	/* do cluster allocation guess first. */
3099	value_size = le64_to_cpu(xe->xe_value_size);
3100
3101	if (old_in_xb) {
3102		/*
3103		 * In xattr set, we always try to set the xe in inode first,
3104		 * so if it can be inserted into inode successfully, the old
3105		 * one will be removed from the xattr block, and this xattr
3106		 * will be inserted into inode as a new xattr in inode.
3107		 */
3108		if (ocfs2_xattr_can_be_in_inode(inode, xi, xis)) {
3109			clusters_add += new_clusters;
3110			credits += ocfs2_remove_extent_credits(inode->i_sb) +
3111				    OCFS2_INODE_UPDATE_CREDITS;
3112			if (!ocfs2_xattr_is_local(xe))
3113				credits += ocfs2_calc_extend_credits(
3114							inode->i_sb,
3115							&def_xv.xv.xr_list,
3116							new_clusters);
3117			goto out;
3118		}
3119	}
3120
3121	if (xi->xi_value_len > OCFS2_XATTR_INLINE_SIZE) {
3122		/* the new values will be stored outside. */
3123		u32 old_clusters = 0;
3124
3125		if (!ocfs2_xattr_is_local(xe)) {
3126			old_clusters =	ocfs2_clusters_for_bytes(inode->i_sb,
3127								 value_size);
3128			xv = (struct ocfs2_xattr_value_root *)
3129			     (base + name_offset + name_len);
3130			value_size = OCFS2_XATTR_ROOT_SIZE;
3131		} else
3132			xv = &def_xv.xv;
3133
3134		if (old_clusters >= new_clusters) {
3135			credits += ocfs2_remove_extent_credits(inode->i_sb);
3136			goto out;
3137		} else {
3138			meta_add += ocfs2_extend_meta_needed(&xv->xr_list);
3139			clusters_add += new_clusters - old_clusters;
3140			credits += ocfs2_calc_extend_credits(inode->i_sb,
3141							     &xv->xr_list,
3142							     new_clusters -
3143							     old_clusters);
3144			if (value_size >= OCFS2_XATTR_ROOT_SIZE)
3145				goto out;
3146		}
3147	} else {
3148		/*
3149		 * Now the new value will be stored inside. So if the new
3150		 * value is smaller than the size of value root or the old
3151		 * value, we don't need any allocation, otherwise we have
3152		 * to guess metadata allocation.
3153		 */
3154		if ((ocfs2_xattr_is_local(xe) &&
3155		     (value_size >= xi->xi_value_len)) ||
3156		    (!ocfs2_xattr_is_local(xe) &&
3157		     OCFS2_XATTR_ROOT_SIZE >= xi->xi_value_len))
3158			goto out;
3159	}
3160
3161meta_guess:
3162	/* calculate metadata allocation. */
3163	if (di->i_xattr_loc) {
3164		if (!xbs->xattr_bh) {
3165			ret = ocfs2_read_xattr_block(inode,
3166						     le64_to_cpu(di->i_xattr_loc),
3167						     &bh);
3168			if (ret) {
3169				mlog_errno(ret);
3170				goto out;
3171			}
3172
3173			xb = (struct ocfs2_xattr_block *)bh->b_data;
3174		} else
3175			xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
3176
3177		/*
3178		 * If there is already an xattr tree, good, we can calculate
3179		 * like other b-trees. Otherwise we may have the chance of
3180		 * create a tree, the credit calculation is borrowed from
3181		 * ocfs2_calc_extend_credits with root_el = NULL. And the
3182		 * new tree will be cluster based, so no meta is needed.
3183		 */
3184		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
3185			struct ocfs2_extent_list *el =
3186				 &xb->xb_attrs.xb_root.xt_list;
3187			meta_add += ocfs2_extend_meta_needed(el);
3188			credits += ocfs2_calc_extend_credits(inode->i_sb,
3189							     el, 1);
3190		} else
3191			credits += OCFS2_SUBALLOC_ALLOC + 1;
3192
3193		/*
3194		 * This cluster will be used either for new bucket or for
3195		 * new xattr block.
3196		 * If the cluster size is the same as the bucket size, one
3197		 * more is needed since we may need to extend the bucket
3198		 * also.
3199		 */
3200		clusters_add += 1;
3201		credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3202		if (OCFS2_XATTR_BUCKET_SIZE ==
3203			OCFS2_SB(inode->i_sb)->s_clustersize) {
3204			credits += ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3205			clusters_add += 1;
3206		}
3207	} else {
3208		meta_add += 1;
3209		credits += OCFS2_XATTR_BLOCK_CREATE_CREDITS;
 
 
 
 
 
 
 
 
3210	}
3211out:
3212	if (clusters_need)
3213		*clusters_need = clusters_add;
3214	if (meta_need)
3215		*meta_need = meta_add;
3216	if (credits_need)
3217		*credits_need = credits;
3218	brelse(bh);
3219	return ret;
3220}
3221
3222static int ocfs2_init_xattr_set_ctxt(struct inode *inode,
3223				     struct ocfs2_dinode *di,
3224				     struct ocfs2_xattr_info *xi,
3225				     struct ocfs2_xattr_search *xis,
3226				     struct ocfs2_xattr_search *xbs,
3227				     struct ocfs2_xattr_set_ctxt *ctxt,
3228				     int extra_meta,
3229				     int *credits)
3230{
3231	int clusters_add, meta_add, ret;
3232	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3233
3234	memset(ctxt, 0, sizeof(struct ocfs2_xattr_set_ctxt));
3235
3236	ocfs2_init_dealloc_ctxt(&ctxt->dealloc);
3237
3238	ret = ocfs2_calc_xattr_set_need(inode, di, xi, xis, xbs,
3239					&clusters_add, &meta_add, credits);
3240	if (ret) {
3241		mlog_errno(ret);
3242		return ret;
3243	}
3244
3245	meta_add += extra_meta;
3246	trace_ocfs2_init_xattr_set_ctxt(xi->xi_name, meta_add,
3247					clusters_add, *credits);
3248
3249	if (meta_add) {
3250		ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add,
3251							&ctxt->meta_ac);
3252		if (ret) {
3253			mlog_errno(ret);
3254			goto out;
3255		}
3256	}
3257
3258	if (clusters_add) {
3259		ret = ocfs2_reserve_clusters(osb, clusters_add, &ctxt->data_ac);
3260		if (ret)
3261			mlog_errno(ret);
3262	}
3263out:
3264	if (ret) {
3265		if (ctxt->meta_ac) {
3266			ocfs2_free_alloc_context(ctxt->meta_ac);
3267			ctxt->meta_ac = NULL;
3268		}
3269
3270		/*
3271		 * We cannot have an error and a non null ctxt->data_ac.
3272		 */
3273	}
3274
3275	return ret;
3276}
3277
3278static int __ocfs2_xattr_set_handle(struct inode *inode,
3279				    struct ocfs2_dinode *di,
3280				    struct ocfs2_xattr_info *xi,
3281				    struct ocfs2_xattr_search *xis,
3282				    struct ocfs2_xattr_search *xbs,
3283				    struct ocfs2_xattr_set_ctxt *ctxt)
3284{
3285	int ret = 0, credits, old_found;
3286
3287	if (!xi->xi_value) {
3288		/* Remove existing extended attribute */
3289		if (!xis->not_found)
3290			ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3291		else if (!xbs->not_found)
3292			ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3293	} else {
3294		/* We always try to set extended attribute into inode first*/
3295		ret = ocfs2_xattr_ibody_set(inode, xi, xis, ctxt);
3296		if (!ret && !xbs->not_found) {
3297			/*
3298			 * If succeed and that extended attribute existing in
3299			 * external block, then we will remove it.
3300			 */
3301			xi->xi_value = NULL;
3302			xi->xi_value_len = 0;
3303
3304			old_found = xis->not_found;
3305			xis->not_found = -ENODATA;
3306			ret = ocfs2_calc_xattr_set_need(inode,
3307							di,
3308							xi,
3309							xis,
3310							xbs,
3311							NULL,
3312							NULL,
3313							&credits);
3314			xis->not_found = old_found;
3315			if (ret) {
3316				mlog_errno(ret);
3317				goto out;
3318			}
3319
3320			ret = ocfs2_extend_trans(ctxt->handle, credits);
3321			if (ret) {
3322				mlog_errno(ret);
3323				goto out;
3324			}
3325			ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3326		} else if ((ret == -ENOSPC) && !ctxt->set_abort) {
3327			if (di->i_xattr_loc && !xbs->xattr_bh) {
3328				ret = ocfs2_xattr_block_find(inode,
3329							     xi->xi_name_index,
3330							     xi->xi_name, xbs);
3331				if (ret)
3332					goto out;
3333
3334				old_found = xis->not_found;
3335				xis->not_found = -ENODATA;
3336				ret = ocfs2_calc_xattr_set_need(inode,
3337								di,
3338								xi,
3339								xis,
3340								xbs,
3341								NULL,
3342								NULL,
3343								&credits);
3344				xis->not_found = old_found;
3345				if (ret) {
3346					mlog_errno(ret);
3347					goto out;
3348				}
3349
3350				ret = ocfs2_extend_trans(ctxt->handle, credits);
3351				if (ret) {
3352					mlog_errno(ret);
3353					goto out;
3354				}
3355			}
3356			/*
3357			 * If no space in inode, we will set extended attribute
3358			 * into external block.
3359			 */
3360			ret = ocfs2_xattr_block_set(inode, xi, xbs, ctxt);
3361			if (ret)
3362				goto out;
3363			if (!xis->not_found) {
3364				/*
3365				 * If succeed and that extended attribute
3366				 * existing in inode, we will remove it.
3367				 */
3368				xi->xi_value = NULL;
3369				xi->xi_value_len = 0;
3370				xbs->not_found = -ENODATA;
3371				ret = ocfs2_calc_xattr_set_need(inode,
3372								di,
3373								xi,
3374								xis,
3375								xbs,
3376								NULL,
3377								NULL,
3378								&credits);
3379				if (ret) {
3380					mlog_errno(ret);
3381					goto out;
3382				}
3383
3384				ret = ocfs2_extend_trans(ctxt->handle, credits);
3385				if (ret) {
3386					mlog_errno(ret);
3387					goto out;
3388				}
3389				ret = ocfs2_xattr_ibody_set(inode, xi,
3390							    xis, ctxt);
3391			}
3392		}
3393	}
3394
3395	if (!ret) {
3396		/* Update inode ctime. */
3397		ret = ocfs2_journal_access_di(ctxt->handle, INODE_CACHE(inode),
3398					      xis->inode_bh,
3399					      OCFS2_JOURNAL_ACCESS_WRITE);
3400		if (ret) {
3401			mlog_errno(ret);
3402			goto out;
3403		}
3404
3405		inode->i_ctime = CURRENT_TIME;
3406		di->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
3407		di->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
3408		ocfs2_journal_dirty(ctxt->handle, xis->inode_bh);
3409	}
3410out:
3411	return ret;
3412}
3413
3414/*
3415 * This function only called duing creating inode
3416 * for init security/acl xattrs of the new inode.
3417 * All transanction credits have been reserved in mknod.
3418 */
3419int ocfs2_xattr_set_handle(handle_t *handle,
3420			   struct inode *inode,
3421			   struct buffer_head *di_bh,
3422			   int name_index,
3423			   const char *name,
3424			   const void *value,
3425			   size_t value_len,
3426			   int flags,
3427			   struct ocfs2_alloc_context *meta_ac,
3428			   struct ocfs2_alloc_context *data_ac)
3429{
3430	struct ocfs2_dinode *di;
3431	int ret;
3432
3433	struct ocfs2_xattr_info xi = {
3434		.xi_name_index = name_index,
3435		.xi_name = name,
3436		.xi_name_len = strlen(name),
3437		.xi_value = value,
3438		.xi_value_len = value_len,
3439	};
3440
3441	struct ocfs2_xattr_search xis = {
3442		.not_found = -ENODATA,
3443	};
3444
3445	struct ocfs2_xattr_search xbs = {
3446		.not_found = -ENODATA,
3447	};
3448
3449	struct ocfs2_xattr_set_ctxt ctxt = {
3450		.handle = handle,
3451		.meta_ac = meta_ac,
3452		.data_ac = data_ac,
3453	};
3454
3455	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3456		return -EOPNOTSUPP;
3457
3458	/*
3459	 * In extreme situation, may need xattr bucket when
3460	 * block size is too small. And we have already reserved
3461	 * the credits for bucket in mknod.
3462	 */
3463	if (inode->i_sb->s_blocksize == OCFS2_MIN_BLOCKSIZE) {
3464		xbs.bucket = ocfs2_xattr_bucket_new(inode);
3465		if (!xbs.bucket) {
3466			mlog_errno(-ENOMEM);
3467			return -ENOMEM;
3468		}
3469	}
3470
3471	xis.inode_bh = xbs.inode_bh = di_bh;
3472	di = (struct ocfs2_dinode *)di_bh->b_data;
3473
3474	down_write(&OCFS2_I(inode)->ip_xattr_sem);
3475
3476	ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3477	if (ret)
3478		goto cleanup;
3479	if (xis.not_found) {
3480		ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3481		if (ret)
3482			goto cleanup;
3483	}
3484
3485	ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
3486
3487cleanup:
3488	up_write(&OCFS2_I(inode)->ip_xattr_sem);
3489	brelse(xbs.xattr_bh);
3490	ocfs2_xattr_bucket_free(xbs.bucket);
3491
3492	return ret;
3493}
3494
3495/*
3496 * ocfs2_xattr_set()
3497 *
3498 * Set, replace or remove an extended attribute for this inode.
3499 * value is NULL to remove an existing extended attribute, else either
3500 * create or replace an extended attribute.
3501 */
3502int ocfs2_xattr_set(struct inode *inode,
3503		    int name_index,
3504		    const char *name,
3505		    const void *value,
3506		    size_t value_len,
3507		    int flags)
3508{
3509	struct buffer_head *di_bh = NULL;
3510	struct ocfs2_dinode *di;
3511	int ret, credits, ref_meta = 0, ref_credits = 0;
3512	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
3513	struct inode *tl_inode = osb->osb_tl_inode;
3514	struct ocfs2_xattr_set_ctxt ctxt = { NULL, NULL, };
3515	struct ocfs2_refcount_tree *ref_tree = NULL;
 
3516
3517	struct ocfs2_xattr_info xi = {
3518		.xi_name_index = name_index,
3519		.xi_name = name,
3520		.xi_name_len = strlen(name),
3521		.xi_value = value,
3522		.xi_value_len = value_len,
3523	};
3524
3525	struct ocfs2_xattr_search xis = {
3526		.not_found = -ENODATA,
3527	};
3528
3529	struct ocfs2_xattr_search xbs = {
3530		.not_found = -ENODATA,
3531	};
3532
3533	if (!ocfs2_supports_xattr(OCFS2_SB(inode->i_sb)))
3534		return -EOPNOTSUPP;
3535
3536	/*
3537	 * Only xbs will be used on indexed trees.  xis doesn't need a
3538	 * bucket.
3539	 */
3540	xbs.bucket = ocfs2_xattr_bucket_new(inode);
3541	if (!xbs.bucket) {
3542		mlog_errno(-ENOMEM);
3543		return -ENOMEM;
3544	}
3545
3546	ret = ocfs2_inode_lock(inode, &di_bh, 1);
3547	if (ret < 0) {
 
3548		mlog_errno(ret);
3549		goto cleanup_nolock;
3550	}
3551	xis.inode_bh = xbs.inode_bh = di_bh;
3552	di = (struct ocfs2_dinode *)di_bh->b_data;
3553
3554	down_write(&OCFS2_I(inode)->ip_xattr_sem);
3555	/*
3556	 * Scan inode and external block to find the same name
3557	 * extended attribute and collect search information.
3558	 */
3559	ret = ocfs2_xattr_ibody_find(inode, name_index, name, &xis);
3560	if (ret)
3561		goto cleanup;
3562	if (xis.not_found) {
3563		ret = ocfs2_xattr_block_find(inode, name_index, name, &xbs);
3564		if (ret)
3565			goto cleanup;
3566	}
3567
3568	if (xis.not_found && xbs.not_found) {
3569		ret = -ENODATA;
3570		if (flags & XATTR_REPLACE)
3571			goto cleanup;
3572		ret = 0;
3573		if (!value)
3574			goto cleanup;
3575	} else {
3576		ret = -EEXIST;
3577		if (flags & XATTR_CREATE)
3578			goto cleanup;
3579	}
3580
3581	/* Check whether the value is refcounted and do some preparation. */
3582	if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL &&
3583	    (!xis.not_found || !xbs.not_found)) {
3584		ret = ocfs2_prepare_refcount_xattr(inode, di, &xi,
3585						   &xis, &xbs, &ref_tree,
3586						   &ref_meta, &ref_credits);
3587		if (ret) {
3588			mlog_errno(ret);
3589			goto cleanup;
3590		}
3591	}
3592
3593	mutex_lock(&tl_inode->i_mutex);
3594
3595	if (ocfs2_truncate_log_needs_flush(osb)) {
3596		ret = __ocfs2_flush_truncate_log(osb);
3597		if (ret < 0) {
3598			mutex_unlock(&tl_inode->i_mutex);
3599			mlog_errno(ret);
3600			goto cleanup;
3601		}
3602	}
3603	mutex_unlock(&tl_inode->i_mutex);
3604
3605	ret = ocfs2_init_xattr_set_ctxt(inode, di, &xi, &xis,
3606					&xbs, &ctxt, ref_meta, &credits);
3607	if (ret) {
3608		mlog_errno(ret);
3609		goto cleanup;
3610	}
3611
3612	/* we need to update inode's ctime field, so add credit for it. */
3613	credits += OCFS2_INODE_UPDATE_CREDITS;
3614	ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
3615	if (IS_ERR(ctxt.handle)) {
3616		ret = PTR_ERR(ctxt.handle);
3617		mlog_errno(ret);
3618		goto cleanup;
3619	}
3620
3621	ret = __ocfs2_xattr_set_handle(inode, di, &xi, &xis, &xbs, &ctxt);
 
3622
3623	ocfs2_commit_trans(osb, ctxt.handle);
3624
 
3625	if (ctxt.data_ac)
3626		ocfs2_free_alloc_context(ctxt.data_ac);
3627	if (ctxt.meta_ac)
3628		ocfs2_free_alloc_context(ctxt.meta_ac);
3629	if (ocfs2_dealloc_has_cluster(&ctxt.dealloc))
3630		ocfs2_schedule_truncate_log_flush(osb, 1);
3631	ocfs2_run_deallocs(osb, &ctxt.dealloc);
3632
3633cleanup:
3634	if (ref_tree)
3635		ocfs2_unlock_refcount_tree(osb, ref_tree, 1);
3636	up_write(&OCFS2_I(inode)->ip_xattr_sem);
3637	if (!value && !ret) {
3638		ret = ocfs2_try_remove_refcount_tree(inode, di_bh);
3639		if (ret)
3640			mlog_errno(ret);
3641	}
3642	ocfs2_inode_unlock(inode, 1);
3643cleanup_nolock:
3644	brelse(di_bh);
3645	brelse(xbs.xattr_bh);
3646	ocfs2_xattr_bucket_free(xbs.bucket);
3647
3648	return ret;
3649}
3650
3651/*
3652 * Find the xattr extent rec which may contains name_hash.
3653 * e_cpos will be the first name hash of the xattr rec.
3654 * el must be the ocfs2_xattr_header.xb_attrs.xb_root.xt_list.
3655 */
3656static int ocfs2_xattr_get_rec(struct inode *inode,
3657			       u32 name_hash,
3658			       u64 *p_blkno,
3659			       u32 *e_cpos,
3660			       u32 *num_clusters,
3661			       struct ocfs2_extent_list *el)
3662{
3663	int ret = 0, i;
3664	struct buffer_head *eb_bh = NULL;
3665	struct ocfs2_extent_block *eb;
3666	struct ocfs2_extent_rec *rec = NULL;
3667	u64 e_blkno = 0;
3668
3669	if (el->l_tree_depth) {
3670		ret = ocfs2_find_leaf(INODE_CACHE(inode), el, name_hash,
3671				      &eb_bh);
3672		if (ret) {
3673			mlog_errno(ret);
3674			goto out;
3675		}
3676
3677		eb = (struct ocfs2_extent_block *) eb_bh->b_data;
3678		el = &eb->h_list;
3679
3680		if (el->l_tree_depth) {
3681			ocfs2_error(inode->i_sb,
3682				    "Inode %lu has non zero tree depth in "
3683				    "xattr tree block %llu\n", inode->i_ino,
3684				    (unsigned long long)eb_bh->b_blocknr);
3685			ret = -EROFS;
3686			goto out;
3687		}
3688	}
3689
3690	for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
3691		rec = &el->l_recs[i];
3692
3693		if (le32_to_cpu(rec->e_cpos) <= name_hash) {
3694			e_blkno = le64_to_cpu(rec->e_blkno);
3695			break;
3696		}
3697	}
3698
3699	if (!e_blkno) {
3700		ocfs2_error(inode->i_sb, "Inode %lu has bad extent "
3701			    "record (%u, %u, 0) in xattr", inode->i_ino,
3702			    le32_to_cpu(rec->e_cpos),
3703			    ocfs2_rec_clusters(el, rec));
3704		ret = -EROFS;
3705		goto out;
3706	}
3707
3708	*p_blkno = le64_to_cpu(rec->e_blkno);
3709	*num_clusters = le16_to_cpu(rec->e_leaf_clusters);
3710	if (e_cpos)
3711		*e_cpos = le32_to_cpu(rec->e_cpos);
3712out:
3713	brelse(eb_bh);
3714	return ret;
3715}
3716
3717typedef int (xattr_bucket_func)(struct inode *inode,
3718				struct ocfs2_xattr_bucket *bucket,
3719				void *para);
3720
3721static int ocfs2_find_xe_in_bucket(struct inode *inode,
3722				   struct ocfs2_xattr_bucket *bucket,
3723				   int name_index,
3724				   const char *name,
3725				   u32 name_hash,
3726				   u16 *xe_index,
3727				   int *found)
3728{
3729	int i, ret = 0, cmp = 1, block_off, new_offset;
3730	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
3731	size_t name_len = strlen(name);
3732	struct ocfs2_xattr_entry *xe = NULL;
3733	char *xe_name;
3734
3735	/*
3736	 * We don't use binary search in the bucket because there
3737	 * may be multiple entries with the same name hash.
3738	 */
3739	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
3740		xe = &xh->xh_entries[i];
3741
3742		if (name_hash > le32_to_cpu(xe->xe_name_hash))
3743			continue;
3744		else if (name_hash < le32_to_cpu(xe->xe_name_hash))
3745			break;
3746
3747		cmp = name_index - ocfs2_xattr_get_type(xe);
3748		if (!cmp)
3749			cmp = name_len - xe->xe_name_len;
3750		if (cmp)
3751			continue;
3752
3753		ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
3754							xh,
3755							i,
3756							&block_off,
3757							&new_offset);
3758		if (ret) {
3759			mlog_errno(ret);
3760			break;
3761		}
3762
3763
3764		xe_name = bucket_block(bucket, block_off) + new_offset;
3765		if (!memcmp(name, xe_name, name_len)) {
3766			*xe_index = i;
3767			*found = 1;
3768			ret = 0;
3769			break;
3770		}
3771	}
3772
3773	return ret;
3774}
3775
3776/*
3777 * Find the specified xattr entry in a series of buckets.
3778 * This series start from p_blkno and last for num_clusters.
3779 * The ocfs2_xattr_header.xh_num_buckets of the first bucket contains
3780 * the num of the valid buckets.
3781 *
3782 * Return the buffer_head this xattr should reside in. And if the xattr's
3783 * hash is in the gap of 2 buckets, return the lower bucket.
3784 */
3785static int ocfs2_xattr_bucket_find(struct inode *inode,
3786				   int name_index,
3787				   const char *name,
3788				   u32 name_hash,
3789				   u64 p_blkno,
3790				   u32 first_hash,
3791				   u32 num_clusters,
3792				   struct ocfs2_xattr_search *xs)
3793{
3794	int ret, found = 0;
3795	struct ocfs2_xattr_header *xh = NULL;
3796	struct ocfs2_xattr_entry *xe = NULL;
3797	u16 index = 0;
3798	u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
3799	int low_bucket = 0, bucket, high_bucket;
3800	struct ocfs2_xattr_bucket *search;
3801	u32 last_hash;
3802	u64 blkno, lower_blkno = 0;
3803
3804	search = ocfs2_xattr_bucket_new(inode);
3805	if (!search) {
3806		ret = -ENOMEM;
3807		mlog_errno(ret);
3808		goto out;
3809	}
3810
3811	ret = ocfs2_read_xattr_bucket(search, p_blkno);
3812	if (ret) {
3813		mlog_errno(ret);
3814		goto out;
3815	}
3816
3817	xh = bucket_xh(search);
3818	high_bucket = le16_to_cpu(xh->xh_num_buckets) - 1;
3819	while (low_bucket <= high_bucket) {
3820		ocfs2_xattr_bucket_relse(search);
3821
3822		bucket = (low_bucket + high_bucket) / 2;
3823		blkno = p_blkno + bucket * blk_per_bucket;
3824		ret = ocfs2_read_xattr_bucket(search, blkno);
3825		if (ret) {
3826			mlog_errno(ret);
3827			goto out;
3828		}
3829
3830		xh = bucket_xh(search);
3831		xe = &xh->xh_entries[0];
3832		if (name_hash < le32_to_cpu(xe->xe_name_hash)) {
3833			high_bucket = bucket - 1;
3834			continue;
3835		}
3836
3837		/*
3838		 * Check whether the hash of the last entry in our
3839		 * bucket is larger than the search one. for an empty
3840		 * bucket, the last one is also the first one.
3841		 */
3842		if (xh->xh_count)
3843			xe = &xh->xh_entries[le16_to_cpu(xh->xh_count) - 1];
3844
3845		last_hash = le32_to_cpu(xe->xe_name_hash);
3846
3847		/* record lower_blkno which may be the insert place. */
3848		lower_blkno = blkno;
3849
3850		if (name_hash > le32_to_cpu(xe->xe_name_hash)) {
3851			low_bucket = bucket + 1;
3852			continue;
3853		}
3854
3855		/* the searched xattr should reside in this bucket if exists. */
3856		ret = ocfs2_find_xe_in_bucket(inode, search,
3857					      name_index, name, name_hash,
3858					      &index, &found);
3859		if (ret) {
3860			mlog_errno(ret);
3861			goto out;
3862		}
3863		break;
3864	}
3865
3866	/*
3867	 * Record the bucket we have found.
3868	 * When the xattr's hash value is in the gap of 2 buckets, we will
3869	 * always set it to the previous bucket.
3870	 */
3871	if (!lower_blkno)
3872		lower_blkno = p_blkno;
3873
3874	/* This should be in cache - we just read it during the search */
3875	ret = ocfs2_read_xattr_bucket(xs->bucket, lower_blkno);
3876	if (ret) {
3877		mlog_errno(ret);
3878		goto out;
3879	}
3880
3881	xs->header = bucket_xh(xs->bucket);
3882	xs->base = bucket_block(xs->bucket, 0);
3883	xs->end = xs->base + inode->i_sb->s_blocksize;
3884
3885	if (found) {
3886		xs->here = &xs->header->xh_entries[index];
3887		trace_ocfs2_xattr_bucket_find(OCFS2_I(inode)->ip_blkno,
3888			name, name_index, name_hash,
3889			(unsigned long long)bucket_blkno(xs->bucket),
3890			index);
3891	} else
3892		ret = -ENODATA;
3893
3894out:
3895	ocfs2_xattr_bucket_free(search);
3896	return ret;
3897}
3898
3899static int ocfs2_xattr_index_block_find(struct inode *inode,
3900					struct buffer_head *root_bh,
3901					int name_index,
3902					const char *name,
3903					struct ocfs2_xattr_search *xs)
3904{
3905	int ret;
3906	struct ocfs2_xattr_block *xb =
3907			(struct ocfs2_xattr_block *)root_bh->b_data;
3908	struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
3909	struct ocfs2_extent_list *el = &xb_root->xt_list;
3910	u64 p_blkno = 0;
3911	u32 first_hash, num_clusters = 0;
3912	u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
3913
3914	if (le16_to_cpu(el->l_next_free_rec) == 0)
3915		return -ENODATA;
3916
3917	trace_ocfs2_xattr_index_block_find(OCFS2_I(inode)->ip_blkno,
3918					name, name_index, name_hash,
3919					(unsigned long long)root_bh->b_blocknr,
3920					-1);
3921
3922	ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &first_hash,
3923				  &num_clusters, el);
3924	if (ret) {
3925		mlog_errno(ret);
3926		goto out;
3927	}
3928
3929	BUG_ON(p_blkno == 0 || num_clusters == 0 || first_hash > name_hash);
3930
3931	trace_ocfs2_xattr_index_block_find_rec(OCFS2_I(inode)->ip_blkno,
3932					name, name_index, first_hash,
3933					(unsigned long long)p_blkno,
3934					num_clusters);
3935
3936	ret = ocfs2_xattr_bucket_find(inode, name_index, name, name_hash,
3937				      p_blkno, first_hash, num_clusters, xs);
3938
3939out:
3940	return ret;
3941}
3942
3943static int ocfs2_iterate_xattr_buckets(struct inode *inode,
3944				       u64 blkno,
3945				       u32 clusters,
3946				       xattr_bucket_func *func,
3947				       void *para)
3948{
3949	int i, ret = 0;
3950	u32 bpc = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
3951	u32 num_buckets = clusters * bpc;
3952	struct ocfs2_xattr_bucket *bucket;
3953
3954	bucket = ocfs2_xattr_bucket_new(inode);
3955	if (!bucket) {
3956		mlog_errno(-ENOMEM);
3957		return -ENOMEM;
3958	}
3959
3960	trace_ocfs2_iterate_xattr_buckets(
3961		(unsigned long long)OCFS2_I(inode)->ip_blkno,
3962		(unsigned long long)blkno, clusters);
3963
3964	for (i = 0; i < num_buckets; i++, blkno += bucket->bu_blocks) {
3965		ret = ocfs2_read_xattr_bucket(bucket, blkno);
3966		if (ret) {
3967			mlog_errno(ret);
3968			break;
3969		}
3970
3971		/*
3972		 * The real bucket num in this series of blocks is stored
3973		 * in the 1st bucket.
3974		 */
3975		if (i == 0)
3976			num_buckets = le16_to_cpu(bucket_xh(bucket)->xh_num_buckets);
3977
3978		trace_ocfs2_iterate_xattr_bucket((unsigned long long)blkno,
3979		     le32_to_cpu(bucket_xh(bucket)->xh_entries[0].xe_name_hash));
3980		if (func) {
3981			ret = func(inode, bucket, para);
3982			if (ret && ret != -ERANGE)
3983				mlog_errno(ret);
3984			/* Fall through to bucket_relse() */
3985		}
3986
3987		ocfs2_xattr_bucket_relse(bucket);
3988		if (ret)
3989			break;
3990	}
3991
3992	ocfs2_xattr_bucket_free(bucket);
3993	return ret;
3994}
3995
3996struct ocfs2_xattr_tree_list {
3997	char *buffer;
3998	size_t buffer_size;
3999	size_t result;
4000};
4001
4002static int ocfs2_xattr_bucket_get_name_value(struct super_block *sb,
4003					     struct ocfs2_xattr_header *xh,
4004					     int index,
4005					     int *block_off,
4006					     int *new_offset)
4007{
4008	u16 name_offset;
4009
4010	if (index < 0 || index >= le16_to_cpu(xh->xh_count))
4011		return -EINVAL;
4012
4013	name_offset = le16_to_cpu(xh->xh_entries[index].xe_name_offset);
4014
4015	*block_off = name_offset >> sb->s_blocksize_bits;
4016	*new_offset = name_offset % sb->s_blocksize;
4017
4018	return 0;
4019}
4020
4021static int ocfs2_list_xattr_bucket(struct inode *inode,
4022				   struct ocfs2_xattr_bucket *bucket,
4023				   void *para)
4024{
4025	int ret = 0, type;
4026	struct ocfs2_xattr_tree_list *xl = (struct ocfs2_xattr_tree_list *)para;
4027	int i, block_off, new_offset;
4028	const char *prefix, *name;
4029
4030	for (i = 0 ; i < le16_to_cpu(bucket_xh(bucket)->xh_count); i++) {
4031		struct ocfs2_xattr_entry *entry = &bucket_xh(bucket)->xh_entries[i];
4032		type = ocfs2_xattr_get_type(entry);
4033		prefix = ocfs2_xattr_prefix(type);
4034
4035		if (prefix) {
4036			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
4037								bucket_xh(bucket),
4038								i,
4039								&block_off,
4040								&new_offset);
4041			if (ret)
4042				break;
4043
4044			name = (const char *)bucket_block(bucket, block_off) +
4045				new_offset;
4046			ret = ocfs2_xattr_list_entry(xl->buffer,
4047						     xl->buffer_size,
4048						     &xl->result,
4049						     prefix, name,
4050						     entry->xe_name_len);
4051			if (ret)
4052				break;
4053		}
4054	}
4055
4056	return ret;
4057}
4058
4059static int ocfs2_iterate_xattr_index_block(struct inode *inode,
4060					   struct buffer_head *blk_bh,
4061					   xattr_tree_rec_func *rec_func,
4062					   void *para)
4063{
4064	struct ocfs2_xattr_block *xb =
4065			(struct ocfs2_xattr_block *)blk_bh->b_data;
4066	struct ocfs2_extent_list *el = &xb->xb_attrs.xb_root.xt_list;
4067	int ret = 0;
4068	u32 name_hash = UINT_MAX, e_cpos = 0, num_clusters = 0;
4069	u64 p_blkno = 0;
4070
4071	if (!el->l_next_free_rec || !rec_func)
4072		return 0;
4073
4074	while (name_hash > 0) {
4075		ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno,
4076					  &e_cpos, &num_clusters, el);
4077		if (ret) {
4078			mlog_errno(ret);
4079			break;
4080		}
4081
4082		ret = rec_func(inode, blk_bh, p_blkno, e_cpos,
4083			       num_clusters, para);
4084		if (ret) {
4085			if (ret != -ERANGE)
4086				mlog_errno(ret);
4087			break;
4088		}
4089
4090		if (e_cpos == 0)
4091			break;
4092
4093		name_hash = e_cpos - 1;
4094	}
4095
4096	return ret;
4097
4098}
4099
4100static int ocfs2_list_xattr_tree_rec(struct inode *inode,
4101				     struct buffer_head *root_bh,
4102				     u64 blkno, u32 cpos, u32 len, void *para)
4103{
4104	return ocfs2_iterate_xattr_buckets(inode, blkno, len,
4105					   ocfs2_list_xattr_bucket, para);
4106}
4107
4108static int ocfs2_xattr_tree_list_index_block(struct inode *inode,
4109					     struct buffer_head *blk_bh,
4110					     char *buffer,
4111					     size_t buffer_size)
4112{
4113	int ret;
4114	struct ocfs2_xattr_tree_list xl = {
4115		.buffer = buffer,
4116		.buffer_size = buffer_size,
4117		.result = 0,
4118	};
4119
4120	ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
4121					      ocfs2_list_xattr_tree_rec, &xl);
4122	if (ret) {
4123		mlog_errno(ret);
4124		goto out;
4125	}
4126
4127	ret = xl.result;
4128out:
4129	return ret;
4130}
4131
4132static int cmp_xe(const void *a, const void *b)
4133{
4134	const struct ocfs2_xattr_entry *l = a, *r = b;
4135	u32 l_hash = le32_to_cpu(l->xe_name_hash);
4136	u32 r_hash = le32_to_cpu(r->xe_name_hash);
4137
4138	if (l_hash > r_hash)
4139		return 1;
4140	if (l_hash < r_hash)
4141		return -1;
4142	return 0;
4143}
4144
4145static void swap_xe(void *a, void *b, int size)
4146{
4147	struct ocfs2_xattr_entry *l = a, *r = b, tmp;
4148
4149	tmp = *l;
4150	memcpy(l, r, sizeof(struct ocfs2_xattr_entry));
4151	memcpy(r, &tmp, sizeof(struct ocfs2_xattr_entry));
4152}
4153
4154/*
4155 * When the ocfs2_xattr_block is filled up, new bucket will be created
4156 * and all the xattr entries will be moved to the new bucket.
4157 * The header goes at the start of the bucket, and the names+values are
4158 * filled from the end.  This is why *target starts as the last buffer.
4159 * Note: we need to sort the entries since they are not saved in order
4160 * in the ocfs2_xattr_block.
4161 */
4162static void ocfs2_cp_xattr_block_to_bucket(struct inode *inode,
4163					   struct buffer_head *xb_bh,
4164					   struct ocfs2_xattr_bucket *bucket)
4165{
4166	int i, blocksize = inode->i_sb->s_blocksize;
4167	int blks = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4168	u16 offset, size, off_change;
4169	struct ocfs2_xattr_entry *xe;
4170	struct ocfs2_xattr_block *xb =
4171				(struct ocfs2_xattr_block *)xb_bh->b_data;
4172	struct ocfs2_xattr_header *xb_xh = &xb->xb_attrs.xb_header;
4173	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
4174	u16 count = le16_to_cpu(xb_xh->xh_count);
4175	char *src = xb_bh->b_data;
4176	char *target = bucket_block(bucket, blks - 1);
4177
4178	trace_ocfs2_cp_xattr_block_to_bucket_begin(
4179				(unsigned long long)xb_bh->b_blocknr,
4180				(unsigned long long)bucket_blkno(bucket));
4181
4182	for (i = 0; i < blks; i++)
4183		memset(bucket_block(bucket, i), 0, blocksize);
4184
4185	/*
4186	 * Since the xe_name_offset is based on ocfs2_xattr_header,
4187	 * there is a offset change corresponding to the change of
4188	 * ocfs2_xattr_header's position.
4189	 */
4190	off_change = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4191	xe = &xb_xh->xh_entries[count - 1];
4192	offset = le16_to_cpu(xe->xe_name_offset) + off_change;
4193	size = blocksize - offset;
4194
4195	/* copy all the names and values. */
4196	memcpy(target + offset, src + offset, size);
4197
4198	/* Init new header now. */
4199	xh->xh_count = xb_xh->xh_count;
4200	xh->xh_num_buckets = cpu_to_le16(1);
4201	xh->xh_name_value_len = cpu_to_le16(size);
4202	xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE - size);
4203
4204	/* copy all the entries. */
4205	target = bucket_block(bucket, 0);
4206	offset = offsetof(struct ocfs2_xattr_header, xh_entries);
4207	size = count * sizeof(struct ocfs2_xattr_entry);
4208	memcpy(target + offset, (char *)xb_xh + offset, size);
4209
4210	/* Change the xe offset for all the xe because of the move. */
4211	off_change = OCFS2_XATTR_BUCKET_SIZE - blocksize +
4212		 offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
4213	for (i = 0; i < count; i++)
4214		le16_add_cpu(&xh->xh_entries[i].xe_name_offset, off_change);
4215
4216	trace_ocfs2_cp_xattr_block_to_bucket_end(offset, size, off_change);
4217
4218	sort(target + offset, count, sizeof(struct ocfs2_xattr_entry),
4219	     cmp_xe, swap_xe);
4220}
4221
4222/*
4223 * After we move xattr from block to index btree, we have to
4224 * update ocfs2_xattr_search to the new xe and base.
4225 *
4226 * When the entry is in xattr block, xattr_bh indicates the storage place.
4227 * While if the entry is in index b-tree, "bucket" indicates the
4228 * real place of the xattr.
4229 */
4230static void ocfs2_xattr_update_xattr_search(struct inode *inode,
4231					    struct ocfs2_xattr_search *xs,
4232					    struct buffer_head *old_bh)
4233{
4234	char *buf = old_bh->b_data;
4235	struct ocfs2_xattr_block *old_xb = (struct ocfs2_xattr_block *)buf;
4236	struct ocfs2_xattr_header *old_xh = &old_xb->xb_attrs.xb_header;
4237	int i;
4238
4239	xs->header = bucket_xh(xs->bucket);
4240	xs->base = bucket_block(xs->bucket, 0);
4241	xs->end = xs->base + inode->i_sb->s_blocksize;
4242
4243	if (xs->not_found)
4244		return;
4245
4246	i = xs->here - old_xh->xh_entries;
4247	xs->here = &xs->header->xh_entries[i];
4248}
4249
4250static int ocfs2_xattr_create_index_block(struct inode *inode,
4251					  struct ocfs2_xattr_search *xs,
4252					  struct ocfs2_xattr_set_ctxt *ctxt)
4253{
4254	int ret;
4255	u32 bit_off, len;
4256	u64 blkno;
4257	handle_t *handle = ctxt->handle;
4258	struct ocfs2_inode_info *oi = OCFS2_I(inode);
4259	struct buffer_head *xb_bh = xs->xattr_bh;
4260	struct ocfs2_xattr_block *xb =
4261			(struct ocfs2_xattr_block *)xb_bh->b_data;
4262	struct ocfs2_xattr_tree_root *xr;
4263	u16 xb_flags = le16_to_cpu(xb->xb_flags);
4264
4265	trace_ocfs2_xattr_create_index_block_begin(
4266				(unsigned long long)xb_bh->b_blocknr);
4267
4268	BUG_ON(xb_flags & OCFS2_XATTR_INDEXED);
4269	BUG_ON(!xs->bucket);
4270
4271	/*
4272	 * XXX:
4273	 * We can use this lock for now, and maybe move to a dedicated mutex
4274	 * if performance becomes a problem later.
4275	 */
4276	down_write(&oi->ip_alloc_sem);
4277
4278	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), xb_bh,
4279				      OCFS2_JOURNAL_ACCESS_WRITE);
4280	if (ret) {
4281		mlog_errno(ret);
4282		goto out;
4283	}
4284
4285	ret = __ocfs2_claim_clusters(handle, ctxt->data_ac,
4286				     1, 1, &bit_off, &len);
4287	if (ret) {
4288		mlog_errno(ret);
4289		goto out;
4290	}
4291
4292	/*
4293	 * The bucket may spread in many blocks, and
4294	 * we will only touch the 1st block and the last block
4295	 * in the whole bucket(one for entry and one for data).
4296	 */
4297	blkno = ocfs2_clusters_to_blocks(inode->i_sb, bit_off);
4298
4299	trace_ocfs2_xattr_create_index_block((unsigned long long)blkno);
4300
4301	ret = ocfs2_init_xattr_bucket(xs->bucket, blkno);
4302	if (ret) {
4303		mlog_errno(ret);
4304		goto out;
4305	}
4306
4307	ret = ocfs2_xattr_bucket_journal_access(handle, xs->bucket,
4308						OCFS2_JOURNAL_ACCESS_CREATE);
4309	if (ret) {
4310		mlog_errno(ret);
4311		goto out;
4312	}
4313
4314	ocfs2_cp_xattr_block_to_bucket(inode, xb_bh, xs->bucket);
4315	ocfs2_xattr_bucket_journal_dirty(handle, xs->bucket);
4316
4317	ocfs2_xattr_update_xattr_search(inode, xs, xb_bh);
4318
4319	/* Change from ocfs2_xattr_header to ocfs2_xattr_tree_root */
4320	memset(&xb->xb_attrs, 0, inode->i_sb->s_blocksize -
4321	       offsetof(struct ocfs2_xattr_block, xb_attrs));
4322
4323	xr = &xb->xb_attrs.xb_root;
4324	xr->xt_clusters = cpu_to_le32(1);
4325	xr->xt_last_eb_blk = 0;
4326	xr->xt_list.l_tree_depth = 0;
4327	xr->xt_list.l_count = cpu_to_le16(ocfs2_xattr_recs_per_xb(inode->i_sb));
4328	xr->xt_list.l_next_free_rec = cpu_to_le16(1);
4329
4330	xr->xt_list.l_recs[0].e_cpos = 0;
4331	xr->xt_list.l_recs[0].e_blkno = cpu_to_le64(blkno);
4332	xr->xt_list.l_recs[0].e_leaf_clusters = cpu_to_le16(1);
4333
4334	xb->xb_flags = cpu_to_le16(xb_flags | OCFS2_XATTR_INDEXED);
4335
4336	ocfs2_journal_dirty(handle, xb_bh);
4337
4338out:
4339	up_write(&oi->ip_alloc_sem);
4340
4341	return ret;
4342}
4343
4344static int cmp_xe_offset(const void *a, const void *b)
4345{
4346	const struct ocfs2_xattr_entry *l = a, *r = b;
4347	u32 l_name_offset = le16_to_cpu(l->xe_name_offset);
4348	u32 r_name_offset = le16_to_cpu(r->xe_name_offset);
4349
4350	if (l_name_offset < r_name_offset)
4351		return 1;
4352	if (l_name_offset > r_name_offset)
4353		return -1;
4354	return 0;
4355}
4356
4357/*
4358 * defrag a xattr bucket if we find that the bucket has some
4359 * holes beteen name/value pairs.
4360 * We will move all the name/value pairs to the end of the bucket
4361 * so that we can spare some space for insertion.
4362 */
4363static int ocfs2_defrag_xattr_bucket(struct inode *inode,
4364				     handle_t *handle,
4365				     struct ocfs2_xattr_bucket *bucket)
4366{
4367	int ret, i;
4368	size_t end, offset, len;
4369	struct ocfs2_xattr_header *xh;
4370	char *entries, *buf, *bucket_buf = NULL;
4371	u64 blkno = bucket_blkno(bucket);
4372	u16 xh_free_start;
4373	size_t blocksize = inode->i_sb->s_blocksize;
4374	struct ocfs2_xattr_entry *xe;
4375
4376	/*
4377	 * In order to make the operation more efficient and generic,
4378	 * we copy all the blocks into a contiguous memory and do the
4379	 * defragment there, so if anything is error, we will not touch
4380	 * the real block.
4381	 */
4382	bucket_buf = kmalloc(OCFS2_XATTR_BUCKET_SIZE, GFP_NOFS);
4383	if (!bucket_buf) {
4384		ret = -EIO;
4385		goto out;
4386	}
4387
4388	buf = bucket_buf;
4389	for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4390		memcpy(buf, bucket_block(bucket, i), blocksize);
4391
4392	ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
4393						OCFS2_JOURNAL_ACCESS_WRITE);
4394	if (ret < 0) {
4395		mlog_errno(ret);
4396		goto out;
4397	}
4398
4399	xh = (struct ocfs2_xattr_header *)bucket_buf;
4400	entries = (char *)xh->xh_entries;
4401	xh_free_start = le16_to_cpu(xh->xh_free_start);
4402
4403	trace_ocfs2_defrag_xattr_bucket(
4404	     (unsigned long long)blkno, le16_to_cpu(xh->xh_count),
4405	     xh_free_start, le16_to_cpu(xh->xh_name_value_len));
4406
4407	/*
4408	 * sort all the entries by their offset.
4409	 * the largest will be the first, so that we can
4410	 * move them to the end one by one.
4411	 */
4412	sort(entries, le16_to_cpu(xh->xh_count),
4413	     sizeof(struct ocfs2_xattr_entry),
4414	     cmp_xe_offset, swap_xe);
4415
4416	/* Move all name/values to the end of the bucket. */
4417	xe = xh->xh_entries;
4418	end = OCFS2_XATTR_BUCKET_SIZE;
4419	for (i = 0; i < le16_to_cpu(xh->xh_count); i++, xe++) {
4420		offset = le16_to_cpu(xe->xe_name_offset);
4421		len = namevalue_size_xe(xe);
4422
4423		/*
4424		 * We must make sure that the name/value pair
4425		 * exist in the same block. So adjust end to
4426		 * the previous block end if needed.
4427		 */
4428		if (((end - len) / blocksize !=
4429			(end - 1) / blocksize))
4430			end = end - end % blocksize;
4431
4432		if (end > offset + len) {
4433			memmove(bucket_buf + end - len,
4434				bucket_buf + offset, len);
4435			xe->xe_name_offset = cpu_to_le16(end - len);
4436		}
4437
4438		mlog_bug_on_msg(end < offset + len, "Defrag check failed for "
4439				"bucket %llu\n", (unsigned long long)blkno);
4440
4441		end -= len;
4442	}
4443
4444	mlog_bug_on_msg(xh_free_start > end, "Defrag check failed for "
4445			"bucket %llu\n", (unsigned long long)blkno);
4446
4447	if (xh_free_start == end)
4448		goto out;
4449
4450	memset(bucket_buf + xh_free_start, 0, end - xh_free_start);
4451	xh->xh_free_start = cpu_to_le16(end);
4452
4453	/* sort the entries by their name_hash. */
4454	sort(entries, le16_to_cpu(xh->xh_count),
4455	     sizeof(struct ocfs2_xattr_entry),
4456	     cmp_xe, swap_xe);
4457
4458	buf = bucket_buf;
4459	for (i = 0; i < bucket->bu_blocks; i++, buf += blocksize)
4460		memcpy(bucket_block(bucket, i), buf, blocksize);
4461	ocfs2_xattr_bucket_journal_dirty(handle, bucket);
4462
4463out:
4464	kfree(bucket_buf);
4465	return ret;
4466}
4467
4468/*
4469 * prev_blkno points to the start of an existing extent.  new_blkno
4470 * points to a newly allocated extent.  Because we know each of our
4471 * clusters contains more than bucket, we can easily split one cluster
4472 * at a bucket boundary.  So we take the last cluster of the existing
4473 * extent and split it down the middle.  We move the last half of the
4474 * buckets in the last cluster of the existing extent over to the new
4475 * extent.
4476 *
4477 * first_bh is the buffer at prev_blkno so we can update the existing
4478 * extent's bucket count.  header_bh is the bucket were we were hoping
4479 * to insert our xattr.  If the bucket move places the target in the new
4480 * extent, we'll update first_bh and header_bh after modifying the old
4481 * extent.
4482 *
4483 * first_hash will be set as the 1st xe's name_hash in the new extent.
4484 */
4485static int ocfs2_mv_xattr_bucket_cross_cluster(struct inode *inode,
4486					       handle_t *handle,
4487					       struct ocfs2_xattr_bucket *first,
4488					       struct ocfs2_xattr_bucket *target,
4489					       u64 new_blkno,
4490					       u32 num_clusters,
4491					       u32 *first_hash)
4492{
4493	int ret;
4494	struct super_block *sb = inode->i_sb;
4495	int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(sb);
4496	int num_buckets = ocfs2_xattr_buckets_per_cluster(OCFS2_SB(sb));
4497	int to_move = num_buckets / 2;
4498	u64 src_blkno;
4499	u64 last_cluster_blkno = bucket_blkno(first) +
4500		((num_clusters - 1) * ocfs2_clusters_to_blocks(sb, 1));
4501
4502	BUG_ON(le16_to_cpu(bucket_xh(first)->xh_num_buckets) < num_buckets);
4503	BUG_ON(OCFS2_XATTR_BUCKET_SIZE == OCFS2_SB(sb)->s_clustersize);
4504
4505	trace_ocfs2_mv_xattr_bucket_cross_cluster(
4506				(unsigned long long)last_cluster_blkno,
4507				(unsigned long long)new_blkno);
4508
4509	ret = ocfs2_mv_xattr_buckets(inode, handle, bucket_blkno(first),
4510				     last_cluster_blkno, new_blkno,
4511				     to_move, first_hash);
4512	if (ret) {
4513		mlog_errno(ret);
4514		goto out;
4515	}
4516
4517	/* This is the first bucket that got moved */
4518	src_blkno = last_cluster_blkno + (to_move * blks_per_bucket);
4519
4520	/*
4521	 * If the target bucket was part of the moved buckets, we need to
4522	 * update first and target.
4523	 */
4524	if (bucket_blkno(target) >= src_blkno) {
4525		/* Find the block for the new target bucket */
4526		src_blkno = new_blkno +
4527			(bucket_blkno(target) - src_blkno);
4528
4529		ocfs2_xattr_bucket_relse(first);
4530		ocfs2_xattr_bucket_relse(target);
4531
4532		/*
4533		 * These shouldn't fail - the buffers are in the
4534		 * journal from ocfs2_cp_xattr_bucket().
4535		 */
4536		ret = ocfs2_read_xattr_bucket(first, new_blkno);
4537		if (ret) {
4538			mlog_errno(ret);
4539			goto out;
4540		}
4541		ret = ocfs2_read_xattr_bucket(target, src_blkno);
4542		if (ret)
4543			mlog_errno(ret);
4544
4545	}
4546
4547out:
4548	return ret;
4549}
4550
4551/*
4552 * Find the suitable pos when we divide a bucket into 2.
4553 * We have to make sure the xattrs with the same hash value exist
4554 * in the same bucket.
4555 *
4556 * If this ocfs2_xattr_header covers more than one hash value, find a
4557 * place where the hash value changes.  Try to find the most even split.
4558 * The most common case is that all entries have different hash values,
4559 * and the first check we make will find a place to split.
4560 */
4561static int ocfs2_xattr_find_divide_pos(struct ocfs2_xattr_header *xh)
4562{
4563	struct ocfs2_xattr_entry *entries = xh->xh_entries;
4564	int count = le16_to_cpu(xh->xh_count);
4565	int delta, middle = count / 2;
4566
4567	/*
4568	 * We start at the middle.  Each step gets farther away in both
4569	 * directions.  We therefore hit the change in hash value
4570	 * nearest to the middle.  Note that this loop does not execute for
4571	 * count < 2.
4572	 */
4573	for (delta = 0; delta < middle; delta++) {
4574		/* Let's check delta earlier than middle */
4575		if (cmp_xe(&entries[middle - delta - 1],
4576			   &entries[middle - delta]))
4577			return middle - delta;
4578
4579		/* For even counts, don't walk off the end */
4580		if ((middle + delta + 1) == count)
4581			continue;
4582
4583		/* Now try delta past middle */
4584		if (cmp_xe(&entries[middle + delta],
4585			   &entries[middle + delta + 1]))
4586			return middle + delta + 1;
4587	}
4588
4589	/* Every entry had the same hash */
4590	return count;
4591}
4592
4593/*
4594 * Move some xattrs in old bucket(blk) to new bucket(new_blk).
4595 * first_hash will record the 1st hash of the new bucket.
4596 *
4597 * Normally half of the xattrs will be moved.  But we have to make
4598 * sure that the xattrs with the same hash value are stored in the
4599 * same bucket. If all the xattrs in this bucket have the same hash
4600 * value, the new bucket will be initialized as an empty one and the
4601 * first_hash will be initialized as (hash_value+1).
4602 */
4603static int ocfs2_divide_xattr_bucket(struct inode *inode,
4604				    handle_t *handle,
4605				    u64 blk,
4606				    u64 new_blk,
4607				    u32 *first_hash,
4608				    int new_bucket_head)
4609{
4610	int ret, i;
4611	int count, start, len, name_value_len = 0, name_offset = 0;
4612	struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4613	struct ocfs2_xattr_header *xh;
4614	struct ocfs2_xattr_entry *xe;
4615	int blocksize = inode->i_sb->s_blocksize;
4616
4617	trace_ocfs2_divide_xattr_bucket_begin((unsigned long long)blk,
4618					      (unsigned long long)new_blk);
4619
4620	s_bucket = ocfs2_xattr_bucket_new(inode);
4621	t_bucket = ocfs2_xattr_bucket_new(inode);
4622	if (!s_bucket || !t_bucket) {
4623		ret = -ENOMEM;
4624		mlog_errno(ret);
4625		goto out;
4626	}
4627
4628	ret = ocfs2_read_xattr_bucket(s_bucket, blk);
4629	if (ret) {
4630		mlog_errno(ret);
4631		goto out;
4632	}
4633
4634	ret = ocfs2_xattr_bucket_journal_access(handle, s_bucket,
4635						OCFS2_JOURNAL_ACCESS_WRITE);
4636	if (ret) {
4637		mlog_errno(ret);
4638		goto out;
4639	}
4640
4641	/*
4642	 * Even if !new_bucket_head, we're overwriting t_bucket.  Thus,
4643	 * there's no need to read it.
4644	 */
4645	ret = ocfs2_init_xattr_bucket(t_bucket, new_blk);
4646	if (ret) {
4647		mlog_errno(ret);
4648		goto out;
4649	}
4650
4651	/*
4652	 * Hey, if we're overwriting t_bucket, what difference does
4653	 * ACCESS_CREATE vs ACCESS_WRITE make?  See the comment in the
4654	 * same part of ocfs2_cp_xattr_bucket().
4655	 */
4656	ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4657						new_bucket_head ?
4658						OCFS2_JOURNAL_ACCESS_CREATE :
4659						OCFS2_JOURNAL_ACCESS_WRITE);
4660	if (ret) {
4661		mlog_errno(ret);
4662		goto out;
4663	}
4664
4665	xh = bucket_xh(s_bucket);
4666	count = le16_to_cpu(xh->xh_count);
4667	start = ocfs2_xattr_find_divide_pos(xh);
4668
4669	if (start == count) {
4670		xe = &xh->xh_entries[start-1];
4671
4672		/*
4673		 * initialized a new empty bucket here.
4674		 * The hash value is set as one larger than
4675		 * that of the last entry in the previous bucket.
4676		 */
4677		for (i = 0; i < t_bucket->bu_blocks; i++)
4678			memset(bucket_block(t_bucket, i), 0, blocksize);
4679
4680		xh = bucket_xh(t_bucket);
4681		xh->xh_free_start = cpu_to_le16(blocksize);
4682		xh->xh_entries[0].xe_name_hash = xe->xe_name_hash;
4683		le32_add_cpu(&xh->xh_entries[0].xe_name_hash, 1);
4684
4685		goto set_num_buckets;
4686	}
4687
4688	/* copy the whole bucket to the new first. */
4689	ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4690
4691	/* update the new bucket. */
4692	xh = bucket_xh(t_bucket);
4693
4694	/*
4695	 * Calculate the total name/value len and xh_free_start for
4696	 * the old bucket first.
4697	 */
4698	name_offset = OCFS2_XATTR_BUCKET_SIZE;
4699	name_value_len = 0;
4700	for (i = 0; i < start; i++) {
4701		xe = &xh->xh_entries[i];
4702		name_value_len += namevalue_size_xe(xe);
4703		if (le16_to_cpu(xe->xe_name_offset) < name_offset)
4704			name_offset = le16_to_cpu(xe->xe_name_offset);
4705	}
4706
4707	/*
4708	 * Now begin the modification to the new bucket.
4709	 *
4710	 * In the new bucket, We just move the xattr entry to the beginning
4711	 * and don't touch the name/value. So there will be some holes in the
4712	 * bucket, and they will be removed when ocfs2_defrag_xattr_bucket is
4713	 * called.
4714	 */
4715	xe = &xh->xh_entries[start];
4716	len = sizeof(struct ocfs2_xattr_entry) * (count - start);
4717	trace_ocfs2_divide_xattr_bucket_move(len,
4718			(int)((char *)xe - (char *)xh),
4719			(int)((char *)xh->xh_entries - (char *)xh));
4720	memmove((char *)xh->xh_entries, (char *)xe, len);
4721	xe = &xh->xh_entries[count - start];
4722	len = sizeof(struct ocfs2_xattr_entry) * start;
4723	memset((char *)xe, 0, len);
4724
4725	le16_add_cpu(&xh->xh_count, -start);
4726	le16_add_cpu(&xh->xh_name_value_len, -name_value_len);
4727
4728	/* Calculate xh_free_start for the new bucket. */
4729	xh->xh_free_start = cpu_to_le16(OCFS2_XATTR_BUCKET_SIZE);
4730	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
4731		xe = &xh->xh_entries[i];
4732		if (le16_to_cpu(xe->xe_name_offset) <
4733		    le16_to_cpu(xh->xh_free_start))
4734			xh->xh_free_start = xe->xe_name_offset;
4735	}
4736
4737set_num_buckets:
4738	/* set xh->xh_num_buckets for the new xh. */
4739	if (new_bucket_head)
4740		xh->xh_num_buckets = cpu_to_le16(1);
4741	else
4742		xh->xh_num_buckets = 0;
4743
4744	ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4745
4746	/* store the first_hash of the new bucket. */
4747	if (first_hash)
4748		*first_hash = le32_to_cpu(xh->xh_entries[0].xe_name_hash);
4749
4750	/*
4751	 * Now only update the 1st block of the old bucket.  If we
4752	 * just added a new empty bucket, there is no need to modify
4753	 * it.
4754	 */
4755	if (start == count)
4756		goto out;
4757
4758	xh = bucket_xh(s_bucket);
4759	memset(&xh->xh_entries[start], 0,
4760	       sizeof(struct ocfs2_xattr_entry) * (count - start));
4761	xh->xh_count = cpu_to_le16(start);
4762	xh->xh_free_start = cpu_to_le16(name_offset);
4763	xh->xh_name_value_len = cpu_to_le16(name_value_len);
4764
4765	ocfs2_xattr_bucket_journal_dirty(handle, s_bucket);
4766
4767out:
4768	ocfs2_xattr_bucket_free(s_bucket);
4769	ocfs2_xattr_bucket_free(t_bucket);
4770
4771	return ret;
4772}
4773
4774/*
4775 * Copy xattr from one bucket to another bucket.
4776 *
4777 * The caller must make sure that the journal transaction
4778 * has enough space for journaling.
4779 */
4780static int ocfs2_cp_xattr_bucket(struct inode *inode,
4781				 handle_t *handle,
4782				 u64 s_blkno,
4783				 u64 t_blkno,
4784				 int t_is_new)
4785{
4786	int ret;
4787	struct ocfs2_xattr_bucket *s_bucket = NULL, *t_bucket = NULL;
4788
4789	BUG_ON(s_blkno == t_blkno);
4790
4791	trace_ocfs2_cp_xattr_bucket((unsigned long long)s_blkno,
4792				    (unsigned long long)t_blkno,
4793				    t_is_new);
4794
4795	s_bucket = ocfs2_xattr_bucket_new(inode);
4796	t_bucket = ocfs2_xattr_bucket_new(inode);
4797	if (!s_bucket || !t_bucket) {
4798		ret = -ENOMEM;
4799		mlog_errno(ret);
4800		goto out;
4801	}
4802
4803	ret = ocfs2_read_xattr_bucket(s_bucket, s_blkno);
4804	if (ret)
4805		goto out;
4806
4807	/*
4808	 * Even if !t_is_new, we're overwriting t_bucket.  Thus,
4809	 * there's no need to read it.
4810	 */
4811	ret = ocfs2_init_xattr_bucket(t_bucket, t_blkno);
4812	if (ret)
4813		goto out;
4814
4815	/*
4816	 * Hey, if we're overwriting t_bucket, what difference does
4817	 * ACCESS_CREATE vs ACCESS_WRITE make?  Well, if we allocated a new
4818	 * cluster to fill, we came here from
4819	 * ocfs2_mv_xattr_buckets(), and it is really new -
4820	 * ACCESS_CREATE is required.  But we also might have moved data
4821	 * out of t_bucket before extending back into it.
4822	 * ocfs2_add_new_xattr_bucket() can do this - its call to
4823	 * ocfs2_add_new_xattr_cluster() may have created a new extent
4824	 * and copied out the end of the old extent.  Then it re-extends
4825	 * the old extent back to create space for new xattrs.  That's
4826	 * how we get here, and the bucket isn't really new.
4827	 */
4828	ret = ocfs2_xattr_bucket_journal_access(handle, t_bucket,
4829						t_is_new ?
4830						OCFS2_JOURNAL_ACCESS_CREATE :
4831						OCFS2_JOURNAL_ACCESS_WRITE);
4832	if (ret)
4833		goto out;
4834
4835	ocfs2_xattr_bucket_copy_data(t_bucket, s_bucket);
4836	ocfs2_xattr_bucket_journal_dirty(handle, t_bucket);
4837
4838out:
4839	ocfs2_xattr_bucket_free(t_bucket);
4840	ocfs2_xattr_bucket_free(s_bucket);
4841
4842	return ret;
4843}
4844
4845/*
4846 * src_blk points to the start of an existing extent.  last_blk points to
4847 * last cluster in that extent.  to_blk points to a newly allocated
4848 * extent.  We copy the buckets from the cluster at last_blk to the new
4849 * extent.  If start_bucket is non-zero, we skip that many buckets before
4850 * we start copying.  The new extent's xh_num_buckets gets set to the
4851 * number of buckets we copied.  The old extent's xh_num_buckets shrinks
4852 * by the same amount.
4853 */
4854static int ocfs2_mv_xattr_buckets(struct inode *inode, handle_t *handle,
4855				  u64 src_blk, u64 last_blk, u64 to_blk,
4856				  unsigned int start_bucket,
4857				  u32 *first_hash)
4858{
4859	int i, ret, credits;
4860	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
4861	int blks_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4862	int num_buckets = ocfs2_xattr_buckets_per_cluster(osb);
4863	struct ocfs2_xattr_bucket *old_first, *new_first;
4864
4865	trace_ocfs2_mv_xattr_buckets((unsigned long long)last_blk,
4866				     (unsigned long long)to_blk);
4867
4868	BUG_ON(start_bucket >= num_buckets);
4869	if (start_bucket) {
4870		num_buckets -= start_bucket;
4871		last_blk += (start_bucket * blks_per_bucket);
4872	}
4873
4874	/* The first bucket of the original extent */
4875	old_first = ocfs2_xattr_bucket_new(inode);
4876	/* The first bucket of the new extent */
4877	new_first = ocfs2_xattr_bucket_new(inode);
4878	if (!old_first || !new_first) {
4879		ret = -ENOMEM;
4880		mlog_errno(ret);
4881		goto out;
4882	}
4883
4884	ret = ocfs2_read_xattr_bucket(old_first, src_blk);
4885	if (ret) {
4886		mlog_errno(ret);
4887		goto out;
4888	}
4889
4890	/*
4891	 * We need to update the first bucket of the old extent and all
4892	 * the buckets going to the new extent.
4893	 */
4894	credits = ((num_buckets + 1) * blks_per_bucket);
4895	ret = ocfs2_extend_trans(handle, credits);
4896	if (ret) {
4897		mlog_errno(ret);
4898		goto out;
4899	}
4900
4901	ret = ocfs2_xattr_bucket_journal_access(handle, old_first,
4902						OCFS2_JOURNAL_ACCESS_WRITE);
4903	if (ret) {
4904		mlog_errno(ret);
4905		goto out;
4906	}
4907
4908	for (i = 0; i < num_buckets; i++) {
4909		ret = ocfs2_cp_xattr_bucket(inode, handle,
4910					    last_blk + (i * blks_per_bucket),
4911					    to_blk + (i * blks_per_bucket),
4912					    1);
4913		if (ret) {
4914			mlog_errno(ret);
4915			goto out;
4916		}
4917	}
4918
4919	/*
4920	 * Get the new bucket ready before we dirty anything
4921	 * (This actually shouldn't fail, because we already dirtied
4922	 * it once in ocfs2_cp_xattr_bucket()).
4923	 */
4924	ret = ocfs2_read_xattr_bucket(new_first, to_blk);
4925	if (ret) {
4926		mlog_errno(ret);
4927		goto out;
4928	}
4929	ret = ocfs2_xattr_bucket_journal_access(handle, new_first,
4930						OCFS2_JOURNAL_ACCESS_WRITE);
4931	if (ret) {
4932		mlog_errno(ret);
4933		goto out;
4934	}
4935
4936	/* Now update the headers */
4937	le16_add_cpu(&bucket_xh(old_first)->xh_num_buckets, -num_buckets);
4938	ocfs2_xattr_bucket_journal_dirty(handle, old_first);
4939
4940	bucket_xh(new_first)->xh_num_buckets = cpu_to_le16(num_buckets);
4941	ocfs2_xattr_bucket_journal_dirty(handle, new_first);
4942
4943	if (first_hash)
4944		*first_hash = le32_to_cpu(bucket_xh(new_first)->xh_entries[0].xe_name_hash);
4945
4946out:
4947	ocfs2_xattr_bucket_free(new_first);
4948	ocfs2_xattr_bucket_free(old_first);
4949	return ret;
4950}
4951
4952/*
4953 * Move some xattrs in this cluster to the new cluster.
4954 * This function should only be called when bucket size == cluster size.
4955 * Otherwise ocfs2_mv_xattr_bucket_cross_cluster should be used instead.
4956 */
4957static int ocfs2_divide_xattr_cluster(struct inode *inode,
4958				      handle_t *handle,
4959				      u64 prev_blk,
4960				      u64 new_blk,
4961				      u32 *first_hash)
4962{
4963	u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
4964	int ret, credits = 2 * blk_per_bucket;
4965
4966	BUG_ON(OCFS2_XATTR_BUCKET_SIZE < OCFS2_SB(inode->i_sb)->s_clustersize);
4967
4968	ret = ocfs2_extend_trans(handle, credits);
4969	if (ret) {
4970		mlog_errno(ret);
4971		return ret;
4972	}
4973
4974	/* Move half of the xattr in start_blk to the next bucket. */
4975	return  ocfs2_divide_xattr_bucket(inode, handle, prev_blk,
4976					  new_blk, first_hash, 1);
4977}
4978
4979/*
4980 * Move some xattrs from the old cluster to the new one since they are not
4981 * contiguous in ocfs2 xattr tree.
4982 *
4983 * new_blk starts a new separate cluster, and we will move some xattrs from
4984 * prev_blk to it. v_start will be set as the first name hash value in this
4985 * new cluster so that it can be used as e_cpos during tree insertion and
4986 * don't collide with our original b-tree operations. first_bh and header_bh
4987 * will also be updated since they will be used in ocfs2_extend_xattr_bucket
4988 * to extend the insert bucket.
4989 *
4990 * The problem is how much xattr should we move to the new one and when should
4991 * we update first_bh and header_bh?
4992 * 1. If cluster size > bucket size, that means the previous cluster has more
4993 *    than 1 bucket, so just move half nums of bucket into the new cluster and
4994 *    update the first_bh and header_bh if the insert bucket has been moved
4995 *    to the new cluster.
4996 * 2. If cluster_size == bucket_size:
4997 *    a) If the previous extent rec has more than one cluster and the insert
4998 *       place isn't in the last cluster, copy the entire last cluster to the
4999 *       new one. This time, we don't need to upate the first_bh and header_bh
5000 *       since they will not be moved into the new cluster.
5001 *    b) Otherwise, move the bottom half of the xattrs in the last cluster into
5002 *       the new one. And we set the extend flag to zero if the insert place is
5003 *       moved into the new allocated cluster since no extend is needed.
5004 */
5005static int ocfs2_adjust_xattr_cross_cluster(struct inode *inode,
5006					    handle_t *handle,
5007					    struct ocfs2_xattr_bucket *first,
5008					    struct ocfs2_xattr_bucket *target,
5009					    u64 new_blk,
5010					    u32 prev_clusters,
5011					    u32 *v_start,
5012					    int *extend)
5013{
5014	int ret;
5015
5016	trace_ocfs2_adjust_xattr_cross_cluster(
5017			(unsigned long long)bucket_blkno(first),
5018			(unsigned long long)new_blk, prev_clusters);
5019
5020	if (ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb)) > 1) {
5021		ret = ocfs2_mv_xattr_bucket_cross_cluster(inode,
5022							  handle,
5023							  first, target,
5024							  new_blk,
5025							  prev_clusters,
5026							  v_start);
5027		if (ret)
5028			mlog_errno(ret);
5029	} else {
5030		/* The start of the last cluster in the first extent */
5031		u64 last_blk = bucket_blkno(first) +
5032			((prev_clusters - 1) *
5033			 ocfs2_clusters_to_blocks(inode->i_sb, 1));
5034
5035		if (prev_clusters > 1 && bucket_blkno(target) != last_blk) {
5036			ret = ocfs2_mv_xattr_buckets(inode, handle,
5037						     bucket_blkno(first),
5038						     last_blk, new_blk, 0,
5039						     v_start);
5040			if (ret)
5041				mlog_errno(ret);
5042		} else {
5043			ret = ocfs2_divide_xattr_cluster(inode, handle,
5044							 last_blk, new_blk,
5045							 v_start);
5046			if (ret)
5047				mlog_errno(ret);
5048
5049			if ((bucket_blkno(target) == last_blk) && extend)
5050				*extend = 0;
5051		}
5052	}
5053
5054	return ret;
5055}
5056
5057/*
5058 * Add a new cluster for xattr storage.
5059 *
5060 * If the new cluster is contiguous with the previous one, it will be
5061 * appended to the same extent record, and num_clusters will be updated.
5062 * If not, we will insert a new extent for it and move some xattrs in
5063 * the last cluster into the new allocated one.
5064 * We also need to limit the maximum size of a btree leaf, otherwise we'll
5065 * lose the benefits of hashing because we'll have to search large leaves.
5066 * So now the maximum size is OCFS2_MAX_XATTR_TREE_LEAF_SIZE(or clustersize,
5067 * if it's bigger).
5068 *
5069 * first_bh is the first block of the previous extent rec and header_bh
5070 * indicates the bucket we will insert the new xattrs. They will be updated
5071 * when the header_bh is moved into the new cluster.
5072 */
5073static int ocfs2_add_new_xattr_cluster(struct inode *inode,
5074				       struct buffer_head *root_bh,
5075				       struct ocfs2_xattr_bucket *first,
5076				       struct ocfs2_xattr_bucket *target,
5077				       u32 *num_clusters,
5078				       u32 prev_cpos,
5079				       int *extend,
5080				       struct ocfs2_xattr_set_ctxt *ctxt)
5081{
5082	int ret;
5083	u16 bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
5084	u32 prev_clusters = *num_clusters;
5085	u32 clusters_to_add = 1, bit_off, num_bits, v_start = 0;
5086	u64 block;
5087	handle_t *handle = ctxt->handle;
5088	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5089	struct ocfs2_extent_tree et;
5090
5091	trace_ocfs2_add_new_xattr_cluster_begin(
5092		(unsigned long long)OCFS2_I(inode)->ip_blkno,
5093		(unsigned long long)bucket_blkno(first),
5094		prev_cpos, prev_clusters);
5095
5096	ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5097
5098	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5099				      OCFS2_JOURNAL_ACCESS_WRITE);
5100	if (ret < 0) {
5101		mlog_errno(ret);
5102		goto leave;
5103	}
5104
5105	ret = __ocfs2_claim_clusters(handle, ctxt->data_ac, 1,
5106				     clusters_to_add, &bit_off, &num_bits);
5107	if (ret < 0) {
5108		if (ret != -ENOSPC)
5109			mlog_errno(ret);
5110		goto leave;
5111	}
5112
5113	BUG_ON(num_bits > clusters_to_add);
5114
5115	block = ocfs2_clusters_to_blocks(osb->sb, bit_off);
5116	trace_ocfs2_add_new_xattr_cluster((unsigned long long)block, num_bits);
5117
5118	if (bucket_blkno(first) + (prev_clusters * bpc) == block &&
5119	    (prev_clusters + num_bits) << osb->s_clustersize_bits <=
5120	     OCFS2_MAX_XATTR_TREE_LEAF_SIZE) {
5121		/*
5122		 * If this cluster is contiguous with the old one and
5123		 * adding this new cluster, we don't surpass the limit of
5124		 * OCFS2_MAX_XATTR_TREE_LEAF_SIZE, cool. We will let it be
5125		 * initialized and used like other buckets in the previous
5126		 * cluster.
5127		 * So add it as a contiguous one. The caller will handle
5128		 * its init process.
5129		 */
5130		v_start = prev_cpos + prev_clusters;
5131		*num_clusters = prev_clusters + num_bits;
5132	} else {
5133		ret = ocfs2_adjust_xattr_cross_cluster(inode,
5134						       handle,
5135						       first,
5136						       target,
5137						       block,
5138						       prev_clusters,
5139						       &v_start,
5140						       extend);
5141		if (ret) {
5142			mlog_errno(ret);
5143			goto leave;
5144		}
5145	}
5146
5147	trace_ocfs2_add_new_xattr_cluster_insert((unsigned long long)block,
5148						 v_start, num_bits);
5149	ret = ocfs2_insert_extent(handle, &et, v_start, block,
5150				  num_bits, 0, ctxt->meta_ac);
5151	if (ret < 0) {
5152		mlog_errno(ret);
5153		goto leave;
5154	}
5155
5156	ocfs2_journal_dirty(handle, root_bh);
5157
5158leave:
5159	return ret;
5160}
5161
5162/*
5163 * We are given an extent.  'first' is the bucket at the very front of
5164 * the extent.  The extent has space for an additional bucket past
5165 * bucket_xh(first)->xh_num_buckets.  'target_blkno' is the block number
5166 * of the target bucket.  We wish to shift every bucket past the target
5167 * down one, filling in that additional space.  When we get back to the
5168 * target, we split the target between itself and the now-empty bucket
5169 * at target+1 (aka, target_blkno + blks_per_bucket).
5170 */
5171static int ocfs2_extend_xattr_bucket(struct inode *inode,
5172				     handle_t *handle,
5173				     struct ocfs2_xattr_bucket *first,
5174				     u64 target_blk,
5175				     u32 num_clusters)
5176{
5177	int ret, credits;
5178	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5179	u16 blk_per_bucket = ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5180	u64 end_blk;
5181	u16 new_bucket = le16_to_cpu(bucket_xh(first)->xh_num_buckets);
5182
5183	trace_ocfs2_extend_xattr_bucket((unsigned long long)target_blk,
5184					(unsigned long long)bucket_blkno(first),
5185					num_clusters, new_bucket);
5186
5187	/* The extent must have room for an additional bucket */
5188	BUG_ON(new_bucket >=
5189	       (num_clusters * ocfs2_xattr_buckets_per_cluster(osb)));
5190
5191	/* end_blk points to the last existing bucket */
5192	end_blk = bucket_blkno(first) + ((new_bucket - 1) * blk_per_bucket);
5193
5194	/*
5195	 * end_blk is the start of the last existing bucket.
5196	 * Thus, (end_blk - target_blk) covers the target bucket and
5197	 * every bucket after it up to, but not including, the last
5198	 * existing bucket.  Then we add the last existing bucket, the
5199	 * new bucket, and the first bucket (3 * blk_per_bucket).
5200	 */
5201	credits = (end_blk - target_blk) + (3 * blk_per_bucket);
5202	ret = ocfs2_extend_trans(handle, credits);
5203	if (ret) {
5204		mlog_errno(ret);
5205		goto out;
5206	}
5207
5208	ret = ocfs2_xattr_bucket_journal_access(handle, first,
5209						OCFS2_JOURNAL_ACCESS_WRITE);
5210	if (ret) {
5211		mlog_errno(ret);
5212		goto out;
5213	}
5214
5215	while (end_blk != target_blk) {
5216		ret = ocfs2_cp_xattr_bucket(inode, handle, end_blk,
5217					    end_blk + blk_per_bucket, 0);
5218		if (ret)
5219			goto out;
5220		end_blk -= blk_per_bucket;
5221	}
5222
5223	/* Move half of the xattr in target_blkno to the next bucket. */
5224	ret = ocfs2_divide_xattr_bucket(inode, handle, target_blk,
5225					target_blk + blk_per_bucket, NULL, 0);
5226
5227	le16_add_cpu(&bucket_xh(first)->xh_num_buckets, 1);
5228	ocfs2_xattr_bucket_journal_dirty(handle, first);
5229
5230out:
5231	return ret;
5232}
5233
5234/*
5235 * Add new xattr bucket in an extent record and adjust the buckets
5236 * accordingly.  xb_bh is the ocfs2_xattr_block, and target is the
5237 * bucket we want to insert into.
5238 *
5239 * In the easy case, we will move all the buckets after target down by
5240 * one. Half of target's xattrs will be moved to the next bucket.
5241 *
5242 * If current cluster is full, we'll allocate a new one.  This may not
5243 * be contiguous.  The underlying calls will make sure that there is
5244 * space for the insert, shifting buckets around if necessary.
5245 * 'target' may be moved by those calls.
5246 */
5247static int ocfs2_add_new_xattr_bucket(struct inode *inode,
5248				      struct buffer_head *xb_bh,
5249				      struct ocfs2_xattr_bucket *target,
5250				      struct ocfs2_xattr_set_ctxt *ctxt)
5251{
5252	struct ocfs2_xattr_block *xb =
5253			(struct ocfs2_xattr_block *)xb_bh->b_data;
5254	struct ocfs2_xattr_tree_root *xb_root = &xb->xb_attrs.xb_root;
5255	struct ocfs2_extent_list *el = &xb_root->xt_list;
5256	u32 name_hash =
5257		le32_to_cpu(bucket_xh(target)->xh_entries[0].xe_name_hash);
5258	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5259	int ret, num_buckets, extend = 1;
5260	u64 p_blkno;
5261	u32 e_cpos, num_clusters;
5262	/* The bucket at the front of the extent */
5263	struct ocfs2_xattr_bucket *first;
5264
5265	trace_ocfs2_add_new_xattr_bucket(
5266				(unsigned long long)bucket_blkno(target));
5267
5268	/* The first bucket of the original extent */
5269	first = ocfs2_xattr_bucket_new(inode);
5270	if (!first) {
5271		ret = -ENOMEM;
5272		mlog_errno(ret);
5273		goto out;
5274	}
5275
5276	ret = ocfs2_xattr_get_rec(inode, name_hash, &p_blkno, &e_cpos,
5277				  &num_clusters, el);
5278	if (ret) {
5279		mlog_errno(ret);
5280		goto out;
5281	}
5282
5283	ret = ocfs2_read_xattr_bucket(first, p_blkno);
5284	if (ret) {
5285		mlog_errno(ret);
5286		goto out;
5287	}
5288
5289	num_buckets = ocfs2_xattr_buckets_per_cluster(osb) * num_clusters;
5290	if (num_buckets == le16_to_cpu(bucket_xh(first)->xh_num_buckets)) {
5291		/*
5292		 * This can move first+target if the target bucket moves
5293		 * to the new extent.
5294		 */
5295		ret = ocfs2_add_new_xattr_cluster(inode,
5296						  xb_bh,
5297						  first,
5298						  target,
5299						  &num_clusters,
5300						  e_cpos,
5301						  &extend,
5302						  ctxt);
5303		if (ret) {
5304			mlog_errno(ret);
5305			goto out;
5306		}
5307	}
5308
5309	if (extend) {
5310		ret = ocfs2_extend_xattr_bucket(inode,
5311						ctxt->handle,
5312						first,
5313						bucket_blkno(target),
5314						num_clusters);
5315		if (ret)
5316			mlog_errno(ret);
5317	}
5318
5319out:
5320	ocfs2_xattr_bucket_free(first);
5321
5322	return ret;
5323}
5324
5325static inline char *ocfs2_xattr_bucket_get_val(struct inode *inode,
5326					struct ocfs2_xattr_bucket *bucket,
5327					int offs)
5328{
5329	int block_off = offs >> inode->i_sb->s_blocksize_bits;
5330
5331	offs = offs % inode->i_sb->s_blocksize;
5332	return bucket_block(bucket, block_off) + offs;
5333}
5334
5335/*
5336 * Truncate the specified xe_off entry in xattr bucket.
5337 * bucket is indicated by header_bh and len is the new length.
5338 * Both the ocfs2_xattr_value_root and the entry will be updated here.
5339 *
5340 * Copy the new updated xe and xe_value_root to new_xe and new_xv if needed.
5341 */
5342static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
5343					     struct ocfs2_xattr_bucket *bucket,
5344					     int xe_off,
5345					     int len,
5346					     struct ocfs2_xattr_set_ctxt *ctxt)
5347{
5348	int ret, offset;
5349	u64 value_blk;
5350	struct ocfs2_xattr_entry *xe;
5351	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5352	size_t blocksize = inode->i_sb->s_blocksize;
5353	struct ocfs2_xattr_value_buf vb = {
5354		.vb_access = ocfs2_journal_access,
5355	};
5356
5357	xe = &xh->xh_entries[xe_off];
5358
5359	BUG_ON(!xe || ocfs2_xattr_is_local(xe));
5360
5361	offset = le16_to_cpu(xe->xe_name_offset) +
5362		 OCFS2_XATTR_SIZE(xe->xe_name_len);
5363
5364	value_blk = offset / blocksize;
5365
5366	/* We don't allow ocfs2_xattr_value to be stored in different block. */
5367	BUG_ON(value_blk != (offset + OCFS2_XATTR_ROOT_SIZE - 1) / blocksize);
5368
5369	vb.vb_bh = bucket->bu_bhs[value_blk];
5370	BUG_ON(!vb.vb_bh);
5371
5372	vb.vb_xv = (struct ocfs2_xattr_value_root *)
5373		(vb.vb_bh->b_data + offset % blocksize);
5374
5375	/*
5376	 * From here on out we have to dirty the bucket.  The generic
5377	 * value calls only modify one of the bucket's bhs, but we need
5378	 * to send the bucket at once.  So if they error, they *could* have
5379	 * modified something.  We have to assume they did, and dirty
5380	 * the whole bucket.  This leaves us in a consistent state.
5381	 */
5382	trace_ocfs2_xattr_bucket_value_truncate(
5383			(unsigned long long)bucket_blkno(bucket), xe_off, len);
5384	ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
5385	if (ret) {
5386		mlog_errno(ret);
5387		goto out;
5388	}
5389
5390	ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
5391						OCFS2_JOURNAL_ACCESS_WRITE);
5392	if (ret) {
5393		mlog_errno(ret);
5394		goto out;
5395	}
5396
5397	xe->xe_value_size = cpu_to_le64(len);
5398
5399	ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
5400
5401out:
5402	return ret;
5403}
5404
5405static int ocfs2_rm_xattr_cluster(struct inode *inode,
5406				  struct buffer_head *root_bh,
5407				  u64 blkno,
5408				  u32 cpos,
5409				  u32 len,
5410				  void *para)
5411{
5412	int ret;
5413	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5414	struct inode *tl_inode = osb->osb_tl_inode;
5415	handle_t *handle;
5416	struct ocfs2_xattr_block *xb =
5417			(struct ocfs2_xattr_block *)root_bh->b_data;
5418	struct ocfs2_alloc_context *meta_ac = NULL;
5419	struct ocfs2_cached_dealloc_ctxt dealloc;
5420	struct ocfs2_extent_tree et;
5421
5422	ret = ocfs2_iterate_xattr_buckets(inode, blkno, len,
5423					  ocfs2_delete_xattr_in_bucket, para);
5424	if (ret) {
5425		mlog_errno(ret);
5426		return ret;
5427	}
5428
5429	ocfs2_init_xattr_tree_extent_tree(&et, INODE_CACHE(inode), root_bh);
5430
5431	ocfs2_init_dealloc_ctxt(&dealloc);
5432
5433	trace_ocfs2_rm_xattr_cluster(
5434			(unsigned long long)OCFS2_I(inode)->ip_blkno,
5435			(unsigned long long)blkno, cpos, len);
5436
5437	ocfs2_remove_xattr_clusters_from_cache(INODE_CACHE(inode), blkno,
5438					       len);
5439
5440	ret = ocfs2_lock_allocators(inode, &et, 0, 1, NULL, &meta_ac);
5441	if (ret) {
5442		mlog_errno(ret);
5443		return ret;
5444	}
5445
5446	mutex_lock(&tl_inode->i_mutex);
5447
5448	if (ocfs2_truncate_log_needs_flush(osb)) {
5449		ret = __ocfs2_flush_truncate_log(osb);
5450		if (ret < 0) {
5451			mlog_errno(ret);
5452			goto out;
5453		}
5454	}
5455
5456	handle = ocfs2_start_trans(osb, ocfs2_remove_extent_credits(osb->sb));
5457	if (IS_ERR(handle)) {
5458		ret = -ENOMEM;
5459		mlog_errno(ret);
5460		goto out;
5461	}
5462
5463	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(inode), root_bh,
5464				      OCFS2_JOURNAL_ACCESS_WRITE);
5465	if (ret) {
5466		mlog_errno(ret);
5467		goto out_commit;
5468	}
5469
5470	ret = ocfs2_remove_extent(handle, &et, cpos, len, meta_ac,
5471				  &dealloc);
5472	if (ret) {
5473		mlog_errno(ret);
5474		goto out_commit;
5475	}
5476
5477	le32_add_cpu(&xb->xb_attrs.xb_root.xt_clusters, -len);
5478	ocfs2_journal_dirty(handle, root_bh);
5479
5480	ret = ocfs2_truncate_log_append(osb, handle, blkno, len);
5481	if (ret)
5482		mlog_errno(ret);
 
5483
5484out_commit:
5485	ocfs2_commit_trans(osb, handle);
5486out:
5487	ocfs2_schedule_truncate_log_flush(osb, 1);
5488
5489	mutex_unlock(&tl_inode->i_mutex);
5490
5491	if (meta_ac)
5492		ocfs2_free_alloc_context(meta_ac);
5493
5494	ocfs2_run_deallocs(osb, &dealloc);
5495
5496	return ret;
5497}
5498
5499/*
5500 * check whether the xattr bucket is filled up with the same hash value.
5501 * If we want to insert the xattr with the same hash, return -ENOSPC.
5502 * If we want to insert a xattr with different hash value, go ahead
5503 * and ocfs2_divide_xattr_bucket will handle this.
5504 */
5505static int ocfs2_check_xattr_bucket_collision(struct inode *inode,
5506					      struct ocfs2_xattr_bucket *bucket,
5507					      const char *name)
5508{
5509	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5510	u32 name_hash = ocfs2_xattr_name_hash(inode, name, strlen(name));
5511
5512	if (name_hash != le32_to_cpu(xh->xh_entries[0].xe_name_hash))
5513		return 0;
5514
5515	if (xh->xh_entries[le16_to_cpu(xh->xh_count) - 1].xe_name_hash ==
5516	    xh->xh_entries[0].xe_name_hash) {
5517		mlog(ML_ERROR, "Too much hash collision in xattr bucket %llu, "
5518		     "hash = %u\n",
5519		     (unsigned long long)bucket_blkno(bucket),
5520		     le32_to_cpu(xh->xh_entries[0].xe_name_hash));
5521		return -ENOSPC;
5522	}
5523
5524	return 0;
5525}
5526
5527/*
5528 * Try to set the entry in the current bucket.  If we fail, the caller
5529 * will handle getting us another bucket.
5530 */
5531static int ocfs2_xattr_set_entry_bucket(struct inode *inode,
5532					struct ocfs2_xattr_info *xi,
5533					struct ocfs2_xattr_search *xs,
5534					struct ocfs2_xattr_set_ctxt *ctxt)
5535{
5536	int ret;
5537	struct ocfs2_xa_loc loc;
5538
5539	trace_ocfs2_xattr_set_entry_bucket(xi->xi_name);
5540
5541	ocfs2_init_xattr_bucket_xa_loc(&loc, xs->bucket,
5542				       xs->not_found ? NULL : xs->here);
5543	ret = ocfs2_xa_set(&loc, xi, ctxt);
5544	if (!ret) {
5545		xs->here = loc.xl_entry;
5546		goto out;
5547	}
5548	if (ret != -ENOSPC) {
5549		mlog_errno(ret);
5550		goto out;
5551	}
5552
5553	/* Ok, we need space.  Let's try defragmenting the bucket. */
5554	ret = ocfs2_defrag_xattr_bucket(inode, ctxt->handle,
5555					xs->bucket);
5556	if (ret) {
5557		mlog_errno(ret);
5558		goto out;
5559	}
5560
5561	ret = ocfs2_xa_set(&loc, xi, ctxt);
5562	if (!ret) {
5563		xs->here = loc.xl_entry;
5564		goto out;
5565	}
5566	if (ret != -ENOSPC)
5567		mlog_errno(ret);
5568
5569
5570out:
5571	return ret;
5572}
5573
5574static int ocfs2_xattr_set_entry_index_block(struct inode *inode,
5575					     struct ocfs2_xattr_info *xi,
5576					     struct ocfs2_xattr_search *xs,
5577					     struct ocfs2_xattr_set_ctxt *ctxt)
5578{
5579	int ret;
5580
5581	trace_ocfs2_xattr_set_entry_index_block(xi->xi_name);
5582
5583	ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5584	if (!ret)
5585		goto out;
5586	if (ret != -ENOSPC) {
5587		mlog_errno(ret);
5588		goto out;
5589	}
5590
5591	/* Ack, need more space.  Let's try to get another bucket! */
5592
5593	/*
5594	 * We do not allow for overlapping ranges between buckets. And
5595	 * the maximum number of collisions we will allow for then is
5596	 * one bucket's worth, so check it here whether we need to
5597	 * add a new bucket for the insert.
5598	 */
5599	ret = ocfs2_check_xattr_bucket_collision(inode,
5600						 xs->bucket,
5601						 xi->xi_name);
5602	if (ret) {
5603		mlog_errno(ret);
5604		goto out;
5605	}
5606
5607	ret = ocfs2_add_new_xattr_bucket(inode,
5608					 xs->xattr_bh,
5609					 xs->bucket,
5610					 ctxt);
5611	if (ret) {
5612		mlog_errno(ret);
5613		goto out;
5614	}
5615
5616	/*
5617	 * ocfs2_add_new_xattr_bucket() will have updated
5618	 * xs->bucket if it moved, but it will not have updated
5619	 * any of the other search fields.  Thus, we drop it and
5620	 * re-search.  Everything should be cached, so it'll be
5621	 * quick.
5622	 */
5623	ocfs2_xattr_bucket_relse(xs->bucket);
5624	ret = ocfs2_xattr_index_block_find(inode, xs->xattr_bh,
5625					   xi->xi_name_index,
5626					   xi->xi_name, xs);
5627	if (ret && ret != -ENODATA)
5628		goto out;
5629	xs->not_found = ret;
5630
5631	/* Ok, we have a new bucket, let's try again */
5632	ret = ocfs2_xattr_set_entry_bucket(inode, xi, xs, ctxt);
5633	if (ret && (ret != -ENOSPC))
5634		mlog_errno(ret);
5635
5636out:
5637	return ret;
5638}
5639
5640static int ocfs2_delete_xattr_in_bucket(struct inode *inode,
5641					struct ocfs2_xattr_bucket *bucket,
5642					void *para)
5643{
5644	int ret = 0, ref_credits;
5645	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5646	u16 i;
5647	struct ocfs2_xattr_entry *xe;
5648	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5649	struct ocfs2_xattr_set_ctxt ctxt = {NULL, NULL,};
5650	int credits = ocfs2_remove_extent_credits(osb->sb) +
5651		ocfs2_blocks_per_xattr_bucket(inode->i_sb);
5652	struct ocfs2_xattr_value_root *xv;
5653	struct ocfs2_rm_xattr_bucket_para *args =
5654			(struct ocfs2_rm_xattr_bucket_para *)para;
5655
5656	ocfs2_init_dealloc_ctxt(&ctxt.dealloc);
5657
5658	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
5659		xe = &xh->xh_entries[i];
5660		if (ocfs2_xattr_is_local(xe))
5661			continue;
5662
5663		ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket,
5664						      i, &xv, NULL);
 
 
 
 
5665
5666		ret = ocfs2_lock_xattr_remove_allocators(inode, xv,
5667							 args->ref_ci,
5668							 args->ref_root_bh,
5669							 &ctxt.meta_ac,
5670							 &ref_credits);
5671
5672		ctxt.handle = ocfs2_start_trans(osb, credits + ref_credits);
5673		if (IS_ERR(ctxt.handle)) {
5674			ret = PTR_ERR(ctxt.handle);
5675			mlog_errno(ret);
5676			break;
5677		}
5678
5679		ret = ocfs2_xattr_bucket_value_truncate(inode, bucket,
5680							i, 0, &ctxt);
5681
5682		ocfs2_commit_trans(osb, ctxt.handle);
5683		if (ctxt.meta_ac) {
5684			ocfs2_free_alloc_context(ctxt.meta_ac);
5685			ctxt.meta_ac = NULL;
5686		}
5687		if (ret) {
5688			mlog_errno(ret);
5689			break;
5690		}
5691	}
5692
5693	if (ctxt.meta_ac)
5694		ocfs2_free_alloc_context(ctxt.meta_ac);
5695	ocfs2_schedule_truncate_log_flush(osb, 1);
5696	ocfs2_run_deallocs(osb, &ctxt.dealloc);
5697	return ret;
5698}
5699
5700/*
5701 * Whenever we modify a xattr value root in the bucket(e.g, CoW
5702 * or change the extent record flag), we need to recalculate
5703 * the metaecc for the whole bucket. So it is done here.
5704 *
5705 * Note:
5706 * We have to give the extra credits for the caller.
5707 */
5708static int ocfs2_xattr_bucket_post_refcount(struct inode *inode,
5709					    handle_t *handle,
5710					    void *para)
5711{
5712	int ret;
5713	struct ocfs2_xattr_bucket *bucket =
5714			(struct ocfs2_xattr_bucket *)para;
5715
5716	ret = ocfs2_xattr_bucket_journal_access(handle, bucket,
5717						OCFS2_JOURNAL_ACCESS_WRITE);
5718	if (ret) {
5719		mlog_errno(ret);
5720		return ret;
5721	}
5722
5723	ocfs2_xattr_bucket_journal_dirty(handle, bucket);
5724
5725	return 0;
5726}
5727
5728/*
5729 * Special action we need if the xattr value is refcounted.
5730 *
5731 * 1. If the xattr is refcounted, lock the tree.
5732 * 2. CoW the xattr if we are setting the new value and the value
5733 *    will be stored outside.
5734 * 3. In other case, decrease_refcount will work for us, so just
5735 *    lock the refcount tree, calculate the meta and credits is OK.
5736 *
5737 * We have to do CoW before ocfs2_init_xattr_set_ctxt since
5738 * currently CoW is a completed transaction, while this function
5739 * will also lock the allocators and let us deadlock. So we will
5740 * CoW the whole xattr value.
5741 */
5742static int ocfs2_prepare_refcount_xattr(struct inode *inode,
5743					struct ocfs2_dinode *di,
5744					struct ocfs2_xattr_info *xi,
5745					struct ocfs2_xattr_search *xis,
5746					struct ocfs2_xattr_search *xbs,
5747					struct ocfs2_refcount_tree **ref_tree,
5748					int *meta_add,
5749					int *credits)
5750{
5751	int ret = 0;
5752	struct ocfs2_xattr_block *xb;
5753	struct ocfs2_xattr_entry *xe;
5754	char *base;
5755	u32 p_cluster, num_clusters;
5756	unsigned int ext_flags;
5757	int name_offset, name_len;
5758	struct ocfs2_xattr_value_buf vb;
5759	struct ocfs2_xattr_bucket *bucket = NULL;
5760	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
5761	struct ocfs2_post_refcount refcount;
5762	struct ocfs2_post_refcount *p = NULL;
5763	struct buffer_head *ref_root_bh = NULL;
5764
5765	if (!xis->not_found) {
5766		xe = xis->here;
5767		name_offset = le16_to_cpu(xe->xe_name_offset);
5768		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5769		base = xis->base;
5770		vb.vb_bh = xis->inode_bh;
5771		vb.vb_access = ocfs2_journal_access_di;
5772	} else {
5773		int i, block_off = 0;
5774		xb = (struct ocfs2_xattr_block *)xbs->xattr_bh->b_data;
5775		xe = xbs->here;
5776		name_offset = le16_to_cpu(xe->xe_name_offset);
5777		name_len = OCFS2_XATTR_SIZE(xe->xe_name_len);
5778		i = xbs->here - xbs->header->xh_entries;
5779
5780		if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED) {
5781			ret = ocfs2_xattr_bucket_get_name_value(inode->i_sb,
5782							bucket_xh(xbs->bucket),
5783							i, &block_off,
5784							&name_offset);
5785			if (ret) {
5786				mlog_errno(ret);
5787				goto out;
5788			}
5789			base = bucket_block(xbs->bucket, block_off);
5790			vb.vb_bh = xbs->bucket->bu_bhs[block_off];
5791			vb.vb_access = ocfs2_journal_access;
5792
5793			if (ocfs2_meta_ecc(osb)) {
5794				/*create parameters for ocfs2_post_refcount. */
5795				bucket = xbs->bucket;
5796				refcount.credits = bucket->bu_blocks;
5797				refcount.para = bucket;
5798				refcount.func =
5799					ocfs2_xattr_bucket_post_refcount;
5800				p = &refcount;
5801			}
5802		} else {
5803			base = xbs->base;
5804			vb.vb_bh = xbs->xattr_bh;
5805			vb.vb_access = ocfs2_journal_access_xb;
5806		}
5807	}
5808
5809	if (ocfs2_xattr_is_local(xe))
5810		goto out;
5811
5812	vb.vb_xv = (struct ocfs2_xattr_value_root *)
5813				(base + name_offset + name_len);
5814
5815	ret = ocfs2_xattr_get_clusters(inode, 0, &p_cluster,
5816				       &num_clusters, &vb.vb_xv->xr_list,
5817				       &ext_flags);
5818	if (ret) {
5819		mlog_errno(ret);
5820		goto out;
5821	}
5822
5823	/*
5824	 * We just need to check the 1st extent record, since we always
5825	 * CoW the whole xattr. So there shouldn't be a xattr with
5826	 * some REFCOUNT extent recs after the 1st one.
5827	 */
5828	if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
5829		goto out;
5830
5831	ret = ocfs2_lock_refcount_tree(osb, le64_to_cpu(di->i_refcount_loc),
5832				       1, ref_tree, &ref_root_bh);
5833	if (ret) {
5834		mlog_errno(ret);
5835		goto out;
5836	}
5837
5838	/*
5839	 * If we are deleting the xattr or the new size will be stored inside,
5840	 * cool, leave it there, the xattr truncate process will remove them
5841	 * for us(it still needs the refcount tree lock and the meta, credits).
5842	 * And the worse case is that every cluster truncate will split the
5843	 * refcount tree, and make the original extent become 3. So we will need
5844	 * 2 * cluster more extent recs at most.
5845	 */
5846	if (!xi->xi_value || xi->xi_value_len <= OCFS2_XATTR_INLINE_SIZE) {
5847
5848		ret = ocfs2_refcounted_xattr_delete_need(inode,
5849							 &(*ref_tree)->rf_ci,
5850							 ref_root_bh, vb.vb_xv,
5851							 meta_add, credits);
5852		if (ret)
5853			mlog_errno(ret);
5854		goto out;
5855	}
5856
5857	ret = ocfs2_refcount_cow_xattr(inode, di, &vb,
5858				       *ref_tree, ref_root_bh, 0,
5859				       le32_to_cpu(vb.vb_xv->xr_clusters), p);
5860	if (ret)
5861		mlog_errno(ret);
5862
5863out:
5864	brelse(ref_root_bh);
5865	return ret;
5866}
5867
5868/*
5869 * Add the REFCOUNTED flags for all the extent rec in ocfs2_xattr_value_root.
5870 * The physical clusters will be added to refcount tree.
5871 */
5872static int ocfs2_xattr_value_attach_refcount(struct inode *inode,
5873				struct ocfs2_xattr_value_root *xv,
5874				struct ocfs2_extent_tree *value_et,
5875				struct ocfs2_caching_info *ref_ci,
5876				struct buffer_head *ref_root_bh,
5877				struct ocfs2_cached_dealloc_ctxt *dealloc,
5878				struct ocfs2_post_refcount *refcount)
5879{
5880	int ret = 0;
5881	u32 clusters = le32_to_cpu(xv->xr_clusters);
5882	u32 cpos, p_cluster, num_clusters;
5883	struct ocfs2_extent_list *el = &xv->xr_list;
5884	unsigned int ext_flags;
5885
5886	cpos = 0;
5887	while (cpos < clusters) {
5888		ret = ocfs2_xattr_get_clusters(inode, cpos, &p_cluster,
5889					       &num_clusters, el, &ext_flags);
 
 
 
 
5890
5891		cpos += num_clusters;
5892		if ((ext_flags & OCFS2_EXT_REFCOUNTED))
5893			continue;
5894
5895		BUG_ON(!p_cluster);
5896
5897		ret = ocfs2_add_refcount_flag(inode, value_et,
5898					      ref_ci, ref_root_bh,
5899					      cpos - num_clusters,
5900					      p_cluster, num_clusters,
5901					      dealloc, refcount);
5902		if (ret) {
5903			mlog_errno(ret);
5904			break;
5905		}
5906	}
5907
5908	return ret;
5909}
5910
5911/*
5912 * Given a normal ocfs2_xattr_header, refcount all the entries which
5913 * have value stored outside.
5914 * Used for xattrs stored in inode and ocfs2_xattr_block.
5915 */
5916static int ocfs2_xattr_attach_refcount_normal(struct inode *inode,
5917				struct ocfs2_xattr_value_buf *vb,
5918				struct ocfs2_xattr_header *header,
5919				struct ocfs2_caching_info *ref_ci,
5920				struct buffer_head *ref_root_bh,
5921				struct ocfs2_cached_dealloc_ctxt *dealloc)
5922{
5923
5924	struct ocfs2_xattr_entry *xe;
5925	struct ocfs2_xattr_value_root *xv;
5926	struct ocfs2_extent_tree et;
5927	int i, ret = 0;
5928
5929	for (i = 0; i < le16_to_cpu(header->xh_count); i++) {
5930		xe = &header->xh_entries[i];
5931
5932		if (ocfs2_xattr_is_local(xe))
5933			continue;
5934
5935		xv = (struct ocfs2_xattr_value_root *)((void *)header +
5936			le16_to_cpu(xe->xe_name_offset) +
5937			OCFS2_XATTR_SIZE(xe->xe_name_len));
5938
5939		vb->vb_xv = xv;
5940		ocfs2_init_xattr_value_extent_tree(&et, INODE_CACHE(inode), vb);
5941
5942		ret = ocfs2_xattr_value_attach_refcount(inode, xv, &et,
5943							ref_ci, ref_root_bh,
5944							dealloc, NULL);
5945		if (ret) {
5946			mlog_errno(ret);
5947			break;
5948		}
5949	}
5950
5951	return ret;
5952}
5953
5954static int ocfs2_xattr_inline_attach_refcount(struct inode *inode,
5955				struct buffer_head *fe_bh,
5956				struct ocfs2_caching_info *ref_ci,
5957				struct buffer_head *ref_root_bh,
5958				struct ocfs2_cached_dealloc_ctxt *dealloc)
5959{
5960	struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
5961	struct ocfs2_xattr_header *header = (struct ocfs2_xattr_header *)
5962				(fe_bh->b_data + inode->i_sb->s_blocksize -
5963				le16_to_cpu(di->i_xattr_inline_size));
5964	struct ocfs2_xattr_value_buf vb = {
5965		.vb_bh = fe_bh,
5966		.vb_access = ocfs2_journal_access_di,
5967	};
5968
5969	return ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
5970						  ref_ci, ref_root_bh, dealloc);
5971}
5972
5973struct ocfs2_xattr_tree_value_refcount_para {
5974	struct ocfs2_caching_info *ref_ci;
5975	struct buffer_head *ref_root_bh;
5976	struct ocfs2_cached_dealloc_ctxt *dealloc;
5977};
5978
5979static int ocfs2_get_xattr_tree_value_root(struct super_block *sb,
5980					   struct ocfs2_xattr_bucket *bucket,
5981					   int offset,
5982					   struct ocfs2_xattr_value_root **xv,
5983					   struct buffer_head **bh)
5984{
5985	int ret, block_off, name_offset;
5986	struct ocfs2_xattr_header *xh = bucket_xh(bucket);
5987	struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
5988	void *base;
5989
5990	ret = ocfs2_xattr_bucket_get_name_value(sb,
5991						bucket_xh(bucket),
5992						offset,
5993						&block_off,
5994						&name_offset);
5995	if (ret) {
5996		mlog_errno(ret);
5997		goto out;
5998	}
5999
6000	base = bucket_block(bucket, block_off);
6001
6002	*xv = (struct ocfs2_xattr_value_root *)(base + name_offset +
6003			 OCFS2_XATTR_SIZE(xe->xe_name_len));
6004
6005	if (bh)
6006		*bh = bucket->bu_bhs[block_off];
6007out:
6008	return ret;
6009}
6010
6011/*
6012 * For a given xattr bucket, refcount all the entries which
6013 * have value stored outside.
6014 */
6015static int ocfs2_xattr_bucket_value_refcount(struct inode *inode,
6016					     struct ocfs2_xattr_bucket *bucket,
6017					     void *para)
6018{
6019	int i, ret = 0;
6020	struct ocfs2_extent_tree et;
6021	struct ocfs2_xattr_tree_value_refcount_para *ref =
6022			(struct ocfs2_xattr_tree_value_refcount_para *)para;
6023	struct ocfs2_xattr_header *xh =
6024			(struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6025	struct ocfs2_xattr_entry *xe;
6026	struct ocfs2_xattr_value_buf vb = {
6027		.vb_access = ocfs2_journal_access,
6028	};
6029	struct ocfs2_post_refcount refcount = {
6030		.credits = bucket->bu_blocks,
6031		.para = bucket,
6032		.func = ocfs2_xattr_bucket_post_refcount,
6033	};
6034	struct ocfs2_post_refcount *p = NULL;
6035
6036	/* We only need post_refcount if we support metaecc. */
6037	if (ocfs2_meta_ecc(OCFS2_SB(inode->i_sb)))
6038		p = &refcount;
6039
6040	trace_ocfs2_xattr_bucket_value_refcount(
6041				(unsigned long long)bucket_blkno(bucket),
6042				le16_to_cpu(xh->xh_count));
6043	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6044		xe = &xh->xh_entries[i];
6045
6046		if (ocfs2_xattr_is_local(xe))
6047			continue;
6048
6049		ret = ocfs2_get_xattr_tree_value_root(inode->i_sb, bucket, i,
6050						      &vb.vb_xv, &vb.vb_bh);
6051		if (ret) {
6052			mlog_errno(ret);
6053			break;
6054		}
6055
6056		ocfs2_init_xattr_value_extent_tree(&et,
6057						   INODE_CACHE(inode), &vb);
6058
6059		ret = ocfs2_xattr_value_attach_refcount(inode, vb.vb_xv,
6060							&et, ref->ref_ci,
6061							ref->ref_root_bh,
6062							ref->dealloc, p);
6063		if (ret) {
6064			mlog_errno(ret);
6065			break;
6066		}
6067	}
6068
6069	return ret;
6070
6071}
6072
6073static int ocfs2_refcount_xattr_tree_rec(struct inode *inode,
6074				     struct buffer_head *root_bh,
6075				     u64 blkno, u32 cpos, u32 len, void *para)
6076{
6077	return ocfs2_iterate_xattr_buckets(inode, blkno, len,
6078					   ocfs2_xattr_bucket_value_refcount,
6079					   para);
6080}
6081
6082static int ocfs2_xattr_block_attach_refcount(struct inode *inode,
6083				struct buffer_head *blk_bh,
6084				struct ocfs2_caching_info *ref_ci,
6085				struct buffer_head *ref_root_bh,
6086				struct ocfs2_cached_dealloc_ctxt *dealloc)
6087{
6088	int ret = 0;
6089	struct ocfs2_xattr_block *xb =
6090				(struct ocfs2_xattr_block *)blk_bh->b_data;
6091
6092	if (!(le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)) {
6093		struct ocfs2_xattr_header *header = &xb->xb_attrs.xb_header;
6094		struct ocfs2_xattr_value_buf vb = {
6095			.vb_bh = blk_bh,
6096			.vb_access = ocfs2_journal_access_xb,
6097		};
6098
6099		ret = ocfs2_xattr_attach_refcount_normal(inode, &vb, header,
6100							 ref_ci, ref_root_bh,
6101							 dealloc);
6102	} else {
6103		struct ocfs2_xattr_tree_value_refcount_para para = {
6104			.ref_ci = ref_ci,
6105			.ref_root_bh = ref_root_bh,
6106			.dealloc = dealloc,
6107		};
6108
6109		ret = ocfs2_iterate_xattr_index_block(inode, blk_bh,
6110						ocfs2_refcount_xattr_tree_rec,
6111						&para);
6112	}
6113
6114	return ret;
6115}
6116
6117int ocfs2_xattr_attach_refcount_tree(struct inode *inode,
6118				     struct buffer_head *fe_bh,
6119				     struct ocfs2_caching_info *ref_ci,
6120				     struct buffer_head *ref_root_bh,
6121				     struct ocfs2_cached_dealloc_ctxt *dealloc)
6122{
6123	int ret = 0;
6124	struct ocfs2_inode_info *oi = OCFS2_I(inode);
6125	struct ocfs2_dinode *di = (struct ocfs2_dinode *)fe_bh->b_data;
6126	struct buffer_head *blk_bh = NULL;
6127
6128	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
6129		ret = ocfs2_xattr_inline_attach_refcount(inode, fe_bh,
6130							 ref_ci, ref_root_bh,
6131							 dealloc);
6132		if (ret) {
6133			mlog_errno(ret);
6134			goto out;
6135		}
6136	}
6137
6138	if (!di->i_xattr_loc)
6139		goto out;
6140
6141	ret = ocfs2_read_xattr_block(inode, le64_to_cpu(di->i_xattr_loc),
6142				     &blk_bh);
6143	if (ret < 0) {
6144		mlog_errno(ret);
6145		goto out;
6146	}
6147
6148	ret = ocfs2_xattr_block_attach_refcount(inode, blk_bh, ref_ci,
6149						ref_root_bh, dealloc);
6150	if (ret)
6151		mlog_errno(ret);
6152
6153	brelse(blk_bh);
6154out:
6155
6156	return ret;
6157}
6158
6159typedef int (should_xattr_reflinked)(struct ocfs2_xattr_entry *xe);
6160/*
6161 * Store the information we need in xattr reflink.
6162 * old_bh and new_bh are inode bh for the old and new inode.
6163 */
6164struct ocfs2_xattr_reflink {
6165	struct inode *old_inode;
6166	struct inode *new_inode;
6167	struct buffer_head *old_bh;
6168	struct buffer_head *new_bh;
6169	struct ocfs2_caching_info *ref_ci;
6170	struct buffer_head *ref_root_bh;
6171	struct ocfs2_cached_dealloc_ctxt *dealloc;
6172	should_xattr_reflinked *xattr_reflinked;
6173};
6174
6175/*
6176 * Given a xattr header and xe offset,
6177 * return the proper xv and the corresponding bh.
6178 * xattr in inode, block and xattr tree have different implementaions.
6179 */
6180typedef int (get_xattr_value_root)(struct super_block *sb,
6181				   struct buffer_head *bh,
6182				   struct ocfs2_xattr_header *xh,
6183				   int offset,
6184				   struct ocfs2_xattr_value_root **xv,
6185				   struct buffer_head **ret_bh,
6186				   void *para);
6187
6188/*
6189 * Calculate all the xattr value root metadata stored in this xattr header and
6190 * credits we need if we create them from the scratch.
6191 * We use get_xattr_value_root so that all types of xattr container can use it.
6192 */
6193static int ocfs2_value_metas_in_xattr_header(struct super_block *sb,
6194					     struct buffer_head *bh,
6195					     struct ocfs2_xattr_header *xh,
6196					     int *metas, int *credits,
6197					     int *num_recs,
6198					     get_xattr_value_root *func,
6199					     void *para)
6200{
6201	int i, ret = 0;
6202	struct ocfs2_xattr_value_root *xv;
6203	struct ocfs2_xattr_entry *xe;
6204
6205	for (i = 0; i < le16_to_cpu(xh->xh_count); i++) {
6206		xe = &xh->xh_entries[i];
6207		if (ocfs2_xattr_is_local(xe))
6208			continue;
6209
6210		ret = func(sb, bh, xh, i, &xv, NULL, para);
6211		if (ret) {
6212			mlog_errno(ret);
6213			break;
6214		}
6215
6216		*metas += le16_to_cpu(xv->xr_list.l_tree_depth) *
6217			  le16_to_cpu(xv->xr_list.l_next_free_rec);
6218
6219		*credits += ocfs2_calc_extend_credits(sb,
6220						&def_xv.xv.xr_list,
6221						le32_to_cpu(xv->xr_clusters));
6222
6223		/*
6224		 * If the value is a tree with depth > 1, We don't go deep
6225		 * to the extent block, so just calculate a maximum record num.
6226		 */
6227		if (!xv->xr_list.l_tree_depth)
6228			*num_recs += le16_to_cpu(xv->xr_list.l_next_free_rec);
6229		else
6230			*num_recs += ocfs2_clusters_for_bytes(sb,
6231							      XATTR_SIZE_MAX);
6232	}
6233
6234	return ret;
6235}
6236
6237/* Used by xattr inode and block to return the right xv and buffer_head. */
6238static int ocfs2_get_xattr_value_root(struct super_block *sb,
6239				      struct buffer_head *bh,
6240				      struct ocfs2_xattr_header *xh,
6241				      int offset,
6242				      struct ocfs2_xattr_value_root **xv,
6243				      struct buffer_head **ret_bh,
6244				      void *para)
6245{
6246	struct ocfs2_xattr_entry *xe = &xh->xh_entries[offset];
6247
6248	*xv = (struct ocfs2_xattr_value_root *)((void *)xh +
6249		le16_to_cpu(xe->xe_name_offset) +
6250		OCFS2_XATTR_SIZE(xe->xe_name_len));
6251
6252	if (ret_bh)
6253		*ret_bh = bh;
6254
6255	return 0;
6256}
6257
6258/*
6259 * Lock the meta_ac and caculate how much credits we need for reflink xattrs.
6260 * It is only used for inline xattr and xattr block.
6261 */
6262static int ocfs2_reflink_lock_xattr_allocators(struct ocfs2_super *osb,
6263					struct ocfs2_xattr_header *xh,
6264					struct buffer_head *ref_root_bh,
6265					int *credits,
6266					struct ocfs2_alloc_context **meta_ac)
6267{
6268	int ret, meta_add = 0, num_recs = 0;
6269	struct ocfs2_refcount_block *rb =
6270			(struct ocfs2_refcount_block *)ref_root_bh->b_data;
6271
6272	*credits = 0;
6273
6274	ret = ocfs2_value_metas_in_xattr_header(osb->sb, NULL, xh,
6275						&meta_add, credits, &num_recs,
6276						ocfs2_get_xattr_value_root,
6277						NULL);
6278	if (ret) {
6279		mlog_errno(ret);
6280		goto out;
6281	}
6282
6283	/*
6284	 * We need to add/modify num_recs in refcount tree, so just calculate
6285	 * an approximate number we need for refcount tree change.
6286	 * Sometimes we need to split the tree, and after split,  half recs
6287	 * will be moved to the new block, and a new block can only provide
6288	 * half number of recs. So we multiple new blocks by 2.
6289	 */
6290	num_recs = num_recs / ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6291	meta_add += num_recs;
6292	*credits += num_recs + num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6293	if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6294		*credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6295			    le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6296	else
6297		*credits += 1;
6298
6299	ret = ocfs2_reserve_new_metadata_blocks(osb, meta_add, meta_ac);
6300	if (ret)
6301		mlog_errno(ret);
6302
6303out:
6304	return ret;
6305}
6306
6307/*
6308 * Given a xattr header, reflink all the xattrs in this container.
6309 * It can be used for inode, block and bucket.
6310 *
6311 * NOTE:
6312 * Before we call this function, the caller has memcpy the xattr in
6313 * old_xh to the new_xh.
6314 *
6315 * If args.xattr_reflinked is set, call it to decide whether the xe should
6316 * be reflinked or not. If not, remove it from the new xattr header.
6317 */
6318static int ocfs2_reflink_xattr_header(handle_t *handle,
6319				      struct ocfs2_xattr_reflink *args,
6320				      struct buffer_head *old_bh,
6321				      struct ocfs2_xattr_header *xh,
6322				      struct buffer_head *new_bh,
6323				      struct ocfs2_xattr_header *new_xh,
6324				      struct ocfs2_xattr_value_buf *vb,
6325				      struct ocfs2_alloc_context *meta_ac,
6326				      get_xattr_value_root *func,
6327				      void *para)
6328{
6329	int ret = 0, i, j;
6330	struct super_block *sb = args->old_inode->i_sb;
6331	struct buffer_head *value_bh;
6332	struct ocfs2_xattr_entry *xe, *last;
6333	struct ocfs2_xattr_value_root *xv, *new_xv;
6334	struct ocfs2_extent_tree data_et;
6335	u32 clusters, cpos, p_cluster, num_clusters;
6336	unsigned int ext_flags = 0;
6337
6338	trace_ocfs2_reflink_xattr_header((unsigned long long)old_bh->b_blocknr,
6339					 le16_to_cpu(xh->xh_count));
6340
6341	last = &new_xh->xh_entries[le16_to_cpu(new_xh->xh_count)];
6342	for (i = 0, j = 0; i < le16_to_cpu(xh->xh_count); i++, j++) {
6343		xe = &xh->xh_entries[i];
6344
6345		if (args->xattr_reflinked && !args->xattr_reflinked(xe)) {
6346			xe = &new_xh->xh_entries[j];
6347
6348			le16_add_cpu(&new_xh->xh_count, -1);
6349			if (new_xh->xh_count) {
6350				memmove(xe, xe + 1,
6351					(void *)last - (void *)xe);
6352				memset(last, 0,
6353				       sizeof(struct ocfs2_xattr_entry));
6354			}
6355
6356			/*
6357			 * We don't want j to increase in the next round since
6358			 * it is already moved ahead.
6359			 */
6360			j--;
6361			continue;
6362		}
6363
6364		if (ocfs2_xattr_is_local(xe))
6365			continue;
6366
6367		ret = func(sb, old_bh, xh, i, &xv, NULL, para);
6368		if (ret) {
6369			mlog_errno(ret);
6370			break;
6371		}
6372
6373		ret = func(sb, new_bh, new_xh, j, &new_xv, &value_bh, para);
6374		if (ret) {
6375			mlog_errno(ret);
6376			break;
6377		}
6378
6379		/*
6380		 * For the xattr which has l_tree_depth = 0, all the extent
6381		 * recs have already be copied to the new xh with the
6382		 * propriate OCFS2_EXT_REFCOUNTED flag we just need to
6383		 * increase the refount count int the refcount tree.
6384		 *
6385		 * For the xattr which has l_tree_depth > 0, we need
6386		 * to initialize it to the empty default value root,
6387		 * and then insert the extents one by one.
6388		 */
6389		if (xv->xr_list.l_tree_depth) {
6390			memcpy(new_xv, &def_xv, sizeof(def_xv));
6391			vb->vb_xv = new_xv;
6392			vb->vb_bh = value_bh;
6393			ocfs2_init_xattr_value_extent_tree(&data_et,
6394					INODE_CACHE(args->new_inode), vb);
6395		}
6396
6397		clusters = le32_to_cpu(xv->xr_clusters);
6398		cpos = 0;
6399		while (cpos < clusters) {
6400			ret = ocfs2_xattr_get_clusters(args->old_inode,
6401						       cpos,
6402						       &p_cluster,
6403						       &num_clusters,
6404						       &xv->xr_list,
6405						       &ext_flags);
6406			if (ret) {
6407				mlog_errno(ret);
6408				goto out;
6409			}
6410
6411			BUG_ON(!p_cluster);
6412
6413			if (xv->xr_list.l_tree_depth) {
6414				ret = ocfs2_insert_extent(handle,
6415						&data_et, cpos,
6416						ocfs2_clusters_to_blocks(
6417							args->old_inode->i_sb,
6418							p_cluster),
6419						num_clusters, ext_flags,
6420						meta_ac);
6421				if (ret) {
6422					mlog_errno(ret);
6423					goto out;
6424				}
6425			}
6426
6427			ret = ocfs2_increase_refcount(handle, args->ref_ci,
6428						      args->ref_root_bh,
6429						      p_cluster, num_clusters,
6430						      meta_ac, args->dealloc);
6431			if (ret) {
6432				mlog_errno(ret);
6433				goto out;
6434			}
6435
6436			cpos += num_clusters;
6437		}
6438	}
6439
6440out:
6441	return ret;
6442}
6443
6444static int ocfs2_reflink_xattr_inline(struct ocfs2_xattr_reflink *args)
6445{
6446	int ret = 0, credits = 0;
6447	handle_t *handle;
6448	struct ocfs2_super *osb = OCFS2_SB(args->old_inode->i_sb);
6449	struct ocfs2_dinode *di = (struct ocfs2_dinode *)args->old_bh->b_data;
6450	int inline_size = le16_to_cpu(di->i_xattr_inline_size);
6451	int header_off = osb->sb->s_blocksize - inline_size;
6452	struct ocfs2_xattr_header *xh = (struct ocfs2_xattr_header *)
6453					(args->old_bh->b_data + header_off);
6454	struct ocfs2_xattr_header *new_xh = (struct ocfs2_xattr_header *)
6455					(args->new_bh->b_data + header_off);
6456	struct ocfs2_alloc_context *meta_ac = NULL;
6457	struct ocfs2_inode_info *new_oi;
6458	struct ocfs2_dinode *new_di;
6459	struct ocfs2_xattr_value_buf vb = {
6460		.vb_bh = args->new_bh,
6461		.vb_access = ocfs2_journal_access_di,
6462	};
6463
6464	ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6465						  &credits, &meta_ac);
6466	if (ret) {
6467		mlog_errno(ret);
6468		goto out;
6469	}
6470
6471	handle = ocfs2_start_trans(osb, credits);
6472	if (IS_ERR(handle)) {
6473		ret = PTR_ERR(handle);
6474		mlog_errno(ret);
6475		goto out;
6476	}
6477
6478	ret = ocfs2_journal_access_di(handle, INODE_CACHE(args->new_inode),
6479				      args->new_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6480	if (ret) {
6481		mlog_errno(ret);
6482		goto out_commit;
6483	}
6484
6485	memcpy(args->new_bh->b_data + header_off,
6486	       args->old_bh->b_data + header_off, inline_size);
6487
6488	new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6489	new_di->i_xattr_inline_size = cpu_to_le16(inline_size);
6490
6491	ret = ocfs2_reflink_xattr_header(handle, args, args->old_bh, xh,
6492					 args->new_bh, new_xh, &vb, meta_ac,
6493					 ocfs2_get_xattr_value_root, NULL);
6494	if (ret) {
6495		mlog_errno(ret);
6496		goto out_commit;
6497	}
6498
6499	new_oi = OCFS2_I(args->new_inode);
 
 
 
 
 
 
 
 
 
 
6500	spin_lock(&new_oi->ip_lock);
6501	new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL | OCFS2_INLINE_XATTR_FL;
6502	new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6503	spin_unlock(&new_oi->ip_lock);
6504
6505	ocfs2_journal_dirty(handle, args->new_bh);
6506
6507out_commit:
6508	ocfs2_commit_trans(osb, handle);
6509
6510out:
6511	if (meta_ac)
6512		ocfs2_free_alloc_context(meta_ac);
6513	return ret;
6514}
6515
6516static int ocfs2_create_empty_xattr_block(struct inode *inode,
6517					  struct buffer_head *fe_bh,
6518					  struct buffer_head **ret_bh,
6519					  int indexed)
6520{
6521	int ret;
6522	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6523	struct ocfs2_xattr_set_ctxt ctxt;
6524
6525	memset(&ctxt, 0, sizeof(ctxt));
6526	ret = ocfs2_reserve_new_metadata_blocks(osb, 1, &ctxt.meta_ac);
6527	if (ret < 0) {
6528		mlog_errno(ret);
6529		return ret;
6530	}
6531
6532	ctxt.handle = ocfs2_start_trans(osb, OCFS2_XATTR_BLOCK_CREATE_CREDITS);
6533	if (IS_ERR(ctxt.handle)) {
6534		ret = PTR_ERR(ctxt.handle);
6535		mlog_errno(ret);
6536		goto out;
6537	}
6538
6539	trace_ocfs2_create_empty_xattr_block(
6540				(unsigned long long)fe_bh->b_blocknr, indexed);
6541	ret = ocfs2_create_xattr_block(inode, fe_bh, &ctxt, indexed,
6542				       ret_bh);
6543	if (ret)
6544		mlog_errno(ret);
6545
6546	ocfs2_commit_trans(osb, ctxt.handle);
6547out:
6548	ocfs2_free_alloc_context(ctxt.meta_ac);
6549	return ret;
6550}
6551
6552static int ocfs2_reflink_xattr_block(struct ocfs2_xattr_reflink *args,
6553				     struct buffer_head *blk_bh,
6554				     struct buffer_head *new_blk_bh)
6555{
6556	int ret = 0, credits = 0;
6557	handle_t *handle;
6558	struct ocfs2_inode_info *new_oi = OCFS2_I(args->new_inode);
6559	struct ocfs2_dinode *new_di;
6560	struct ocfs2_super *osb = OCFS2_SB(args->new_inode->i_sb);
6561	int header_off = offsetof(struct ocfs2_xattr_block, xb_attrs.xb_header);
6562	struct ocfs2_xattr_block *xb =
6563			(struct ocfs2_xattr_block *)blk_bh->b_data;
6564	struct ocfs2_xattr_header *xh = &xb->xb_attrs.xb_header;
6565	struct ocfs2_xattr_block *new_xb =
6566			(struct ocfs2_xattr_block *)new_blk_bh->b_data;
6567	struct ocfs2_xattr_header *new_xh = &new_xb->xb_attrs.xb_header;
6568	struct ocfs2_alloc_context *meta_ac;
6569	struct ocfs2_xattr_value_buf vb = {
6570		.vb_bh = new_blk_bh,
6571		.vb_access = ocfs2_journal_access_xb,
6572	};
6573
6574	ret = ocfs2_reflink_lock_xattr_allocators(osb, xh, args->ref_root_bh,
6575						  &credits, &meta_ac);
6576	if (ret) {
6577		mlog_errno(ret);
6578		return ret;
6579	}
6580
6581	/* One more credits in case we need to add xattr flags in new inode. */
6582	handle = ocfs2_start_trans(osb, credits + 1);
6583	if (IS_ERR(handle)) {
6584		ret = PTR_ERR(handle);
6585		mlog_errno(ret);
6586		goto out;
6587	}
6588
6589	if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6590		ret = ocfs2_journal_access_di(handle,
6591					      INODE_CACHE(args->new_inode),
6592					      args->new_bh,
6593					      OCFS2_JOURNAL_ACCESS_WRITE);
6594		if (ret) {
6595			mlog_errno(ret);
6596			goto out_commit;
6597		}
6598	}
6599
6600	ret = ocfs2_journal_access_xb(handle, INODE_CACHE(args->new_inode),
6601				      new_blk_bh, OCFS2_JOURNAL_ACCESS_WRITE);
6602	if (ret) {
6603		mlog_errno(ret);
6604		goto out_commit;
6605	}
6606
6607	memcpy(new_blk_bh->b_data + header_off, blk_bh->b_data + header_off,
6608	       osb->sb->s_blocksize - header_off);
6609
6610	ret = ocfs2_reflink_xattr_header(handle, args, blk_bh, xh,
6611					 new_blk_bh, new_xh, &vb, meta_ac,
6612					 ocfs2_get_xattr_value_root, NULL);
6613	if (ret) {
6614		mlog_errno(ret);
6615		goto out_commit;
6616	}
6617
6618	ocfs2_journal_dirty(handle, new_blk_bh);
6619
6620	if (!(new_oi->ip_dyn_features & OCFS2_HAS_XATTR_FL)) {
6621		new_di = (struct ocfs2_dinode *)args->new_bh->b_data;
6622		spin_lock(&new_oi->ip_lock);
6623		new_oi->ip_dyn_features |= OCFS2_HAS_XATTR_FL;
6624		new_di->i_dyn_features = cpu_to_le16(new_oi->ip_dyn_features);
6625		spin_unlock(&new_oi->ip_lock);
6626
6627		ocfs2_journal_dirty(handle, args->new_bh);
6628	}
6629
6630out_commit:
6631	ocfs2_commit_trans(osb, handle);
6632
6633out:
6634	ocfs2_free_alloc_context(meta_ac);
6635	return ret;
6636}
6637
6638struct ocfs2_reflink_xattr_tree_args {
6639	struct ocfs2_xattr_reflink *reflink;
6640	struct buffer_head *old_blk_bh;
6641	struct buffer_head *new_blk_bh;
6642	struct ocfs2_xattr_bucket *old_bucket;
6643	struct ocfs2_xattr_bucket *new_bucket;
6644};
6645
6646/*
6647 * NOTE:
6648 * We have to handle the case that both old bucket and new bucket
6649 * will call this function to get the right ret_bh.
6650 * So The caller must give us the right bh.
6651 */
6652static int ocfs2_get_reflink_xattr_value_root(struct super_block *sb,
6653					struct buffer_head *bh,
6654					struct ocfs2_xattr_header *xh,
6655					int offset,
6656					struct ocfs2_xattr_value_root **xv,
6657					struct buffer_head **ret_bh,
6658					void *para)
6659{
6660	struct ocfs2_reflink_xattr_tree_args *args =
6661			(struct ocfs2_reflink_xattr_tree_args *)para;
6662	struct ocfs2_xattr_bucket *bucket;
6663
6664	if (bh == args->old_bucket->bu_bhs[0])
6665		bucket = args->old_bucket;
6666	else
6667		bucket = args->new_bucket;
6668
6669	return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6670					       xv, ret_bh);
6671}
6672
6673struct ocfs2_value_tree_metas {
6674	int num_metas;
6675	int credits;
6676	int num_recs;
6677};
6678
6679static int ocfs2_value_tree_metas_in_bucket(struct super_block *sb,
6680					struct buffer_head *bh,
6681					struct ocfs2_xattr_header *xh,
6682					int offset,
6683					struct ocfs2_xattr_value_root **xv,
6684					struct buffer_head **ret_bh,
6685					void *para)
6686{
6687	struct ocfs2_xattr_bucket *bucket =
6688				(struct ocfs2_xattr_bucket *)para;
6689
6690	return ocfs2_get_xattr_tree_value_root(sb, bucket, offset,
6691					       xv, ret_bh);
6692}
6693
6694static int ocfs2_calc_value_tree_metas(struct inode *inode,
6695				      struct ocfs2_xattr_bucket *bucket,
6696				      void *para)
6697{
6698	struct ocfs2_value_tree_metas *metas =
6699			(struct ocfs2_value_tree_metas *)para;
6700	struct ocfs2_xattr_header *xh =
6701			(struct ocfs2_xattr_header *)bucket->bu_bhs[0]->b_data;
6702
6703	/* Add the credits for this bucket first. */
6704	metas->credits += bucket->bu_blocks;
6705	return ocfs2_value_metas_in_xattr_header(inode->i_sb, bucket->bu_bhs[0],
6706					xh, &metas->num_metas,
6707					&metas->credits, &metas->num_recs,
6708					ocfs2_value_tree_metas_in_bucket,
6709					bucket);
6710}
6711
6712/*
6713 * Given a xattr extent rec starting from blkno and having len clusters,
6714 * iterate all the buckets calculate how much metadata we need for reflinking
6715 * all the ocfs2_xattr_value_root and lock the allocators accordingly.
6716 */
6717static int ocfs2_lock_reflink_xattr_rec_allocators(
6718				struct ocfs2_reflink_xattr_tree_args *args,
6719				struct ocfs2_extent_tree *xt_et,
6720				u64 blkno, u32 len, int *credits,
6721				struct ocfs2_alloc_context **meta_ac,
6722				struct ocfs2_alloc_context **data_ac)
6723{
6724	int ret, num_free_extents;
6725	struct ocfs2_value_tree_metas metas;
6726	struct ocfs2_super *osb = OCFS2_SB(args->reflink->old_inode->i_sb);
6727	struct ocfs2_refcount_block *rb;
6728
6729	memset(&metas, 0, sizeof(metas));
6730
6731	ret = ocfs2_iterate_xattr_buckets(args->reflink->old_inode, blkno, len,
6732					  ocfs2_calc_value_tree_metas, &metas);
6733	if (ret) {
6734		mlog_errno(ret);
6735		goto out;
6736	}
6737
6738	*credits = metas.credits;
6739
6740	/*
6741	 * Calculate we need for refcount tree change.
6742	 *
6743	 * We need to add/modify num_recs in refcount tree, so just calculate
6744	 * an approximate number we need for refcount tree change.
6745	 * Sometimes we need to split the tree, and after split,  half recs
6746	 * will be moved to the new block, and a new block can only provide
6747	 * half number of recs. So we multiple new blocks by 2.
6748	 * In the end, we have to add credits for modifying the already
6749	 * existed refcount block.
6750	 */
6751	rb = (struct ocfs2_refcount_block *)args->reflink->ref_root_bh->b_data;
6752	metas.num_recs =
6753		(metas.num_recs + ocfs2_refcount_recs_per_rb(osb->sb) - 1) /
6754		 ocfs2_refcount_recs_per_rb(osb->sb) * 2;
6755	metas.num_metas += metas.num_recs;
6756	*credits += metas.num_recs +
6757		    metas.num_recs * OCFS2_EXPAND_REFCOUNT_TREE_CREDITS;
6758	if (le32_to_cpu(rb->rf_flags) & OCFS2_REFCOUNT_TREE_FL)
6759		*credits += le16_to_cpu(rb->rf_list.l_tree_depth) *
6760			    le16_to_cpu(rb->rf_list.l_next_free_rec) + 1;
6761	else
6762		*credits += 1;
6763
6764	/* count in the xattr tree change. */
6765	num_free_extents = ocfs2_num_free_extents(osb, xt_et);
6766	if (num_free_extents < 0) {
6767		ret = num_free_extents;
6768		mlog_errno(ret);
6769		goto out;
6770	}
6771
6772	if (num_free_extents < len)
6773		metas.num_metas += ocfs2_extend_meta_needed(xt_et->et_root_el);
6774
6775	*credits += ocfs2_calc_extend_credits(osb->sb,
6776					      xt_et->et_root_el, len);
6777
6778	if (metas.num_metas) {
6779		ret = ocfs2_reserve_new_metadata_blocks(osb, metas.num_metas,
6780							meta_ac);
6781		if (ret) {
6782			mlog_errno(ret);
6783			goto out;
6784		}
6785	}
6786
6787	if (len) {
6788		ret = ocfs2_reserve_clusters(osb, len, data_ac);
6789		if (ret)
6790			mlog_errno(ret);
6791	}
6792out:
6793	if (ret) {
6794		if (*meta_ac) {
6795			ocfs2_free_alloc_context(*meta_ac);
6796			meta_ac = NULL;
6797		}
6798	}
6799
6800	return ret;
6801}
6802
6803static int ocfs2_reflink_xattr_bucket(handle_t *handle,
6804				u64 blkno, u64 new_blkno, u32 clusters,
6805				u32 *cpos, int num_buckets,
6806				struct ocfs2_alloc_context *meta_ac,
6807				struct ocfs2_alloc_context *data_ac,
6808				struct ocfs2_reflink_xattr_tree_args *args)
6809{
6810	int i, j, ret = 0;
6811	struct super_block *sb = args->reflink->old_inode->i_sb;
6812	int bpb = args->old_bucket->bu_blocks;
6813	struct ocfs2_xattr_value_buf vb = {
6814		.vb_access = ocfs2_journal_access,
6815	};
6816
6817	for (i = 0; i < num_buckets; i++, blkno += bpb, new_blkno += bpb) {
6818		ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6819		if (ret) {
6820			mlog_errno(ret);
6821			break;
6822		}
6823
6824		ret = ocfs2_init_xattr_bucket(args->new_bucket, new_blkno);
6825		if (ret) {
6826			mlog_errno(ret);
6827			break;
6828		}
6829
6830		ret = ocfs2_xattr_bucket_journal_access(handle,
6831						args->new_bucket,
6832						OCFS2_JOURNAL_ACCESS_CREATE);
6833		if (ret) {
6834			mlog_errno(ret);
6835			break;
6836		}
6837
6838		for (j = 0; j < bpb; j++)
6839			memcpy(bucket_block(args->new_bucket, j),
6840			       bucket_block(args->old_bucket, j),
6841			       sb->s_blocksize);
6842
6843		/*
6844		 * Record the start cpos so that we can use it to initialize
6845		 * our xattr tree we also set the xh_num_bucket for the new
6846		 * bucket.
6847		 */
6848		if (i == 0) {
6849			*cpos = le32_to_cpu(bucket_xh(args->new_bucket)->
6850					    xh_entries[0].xe_name_hash);
6851			bucket_xh(args->new_bucket)->xh_num_buckets =
6852				cpu_to_le16(num_buckets);
6853		}
6854
6855		ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6856
6857		ret = ocfs2_reflink_xattr_header(handle, args->reflink,
6858					args->old_bucket->bu_bhs[0],
6859					bucket_xh(args->old_bucket),
6860					args->new_bucket->bu_bhs[0],
6861					bucket_xh(args->new_bucket),
6862					&vb, meta_ac,
6863					ocfs2_get_reflink_xattr_value_root,
6864					args);
6865		if (ret) {
6866			mlog_errno(ret);
6867			break;
6868		}
6869
6870		/*
6871		 * Re-access and dirty the bucket to calculate metaecc.
6872		 * Because we may extend the transaction in reflink_xattr_header
6873		 * which will let the already accessed block gone.
6874		 */
6875		ret = ocfs2_xattr_bucket_journal_access(handle,
6876						args->new_bucket,
6877						OCFS2_JOURNAL_ACCESS_WRITE);
6878		if (ret) {
6879			mlog_errno(ret);
6880			break;
6881		}
6882
6883		ocfs2_xattr_bucket_journal_dirty(handle, args->new_bucket);
6884
6885		ocfs2_xattr_bucket_relse(args->old_bucket);
6886		ocfs2_xattr_bucket_relse(args->new_bucket);
6887	}
6888
6889	ocfs2_xattr_bucket_relse(args->old_bucket);
6890	ocfs2_xattr_bucket_relse(args->new_bucket);
6891	return ret;
6892}
6893
6894static int ocfs2_reflink_xattr_buckets(handle_t *handle,
6895				struct inode *inode,
6896				struct ocfs2_reflink_xattr_tree_args *args,
6897				struct ocfs2_extent_tree *et,
6898				struct ocfs2_alloc_context *meta_ac,
6899				struct ocfs2_alloc_context *data_ac,
6900				u64 blkno, u32 cpos, u32 len)
6901{
6902	int ret, first_inserted = 0;
6903	u32 p_cluster, num_clusters, reflink_cpos = 0;
6904	u64 new_blkno;
6905	unsigned int num_buckets, reflink_buckets;
6906	unsigned int bpc =
6907		ocfs2_xattr_buckets_per_cluster(OCFS2_SB(inode->i_sb));
6908
6909	ret = ocfs2_read_xattr_bucket(args->old_bucket, blkno);
6910	if (ret) {
6911		mlog_errno(ret);
6912		goto out;
6913	}
6914	num_buckets = le16_to_cpu(bucket_xh(args->old_bucket)->xh_num_buckets);
6915	ocfs2_xattr_bucket_relse(args->old_bucket);
6916
6917	while (len && num_buckets) {
6918		ret = ocfs2_claim_clusters(handle, data_ac,
6919					   1, &p_cluster, &num_clusters);
6920		if (ret) {
6921			mlog_errno(ret);
6922			goto out;
6923		}
6924
6925		new_blkno = ocfs2_clusters_to_blocks(inode->i_sb, p_cluster);
6926		reflink_buckets = min(num_buckets, bpc * num_clusters);
6927
6928		ret = ocfs2_reflink_xattr_bucket(handle, blkno,
6929						 new_blkno, num_clusters,
6930						 &reflink_cpos, reflink_buckets,
6931						 meta_ac, data_ac, args);
6932		if (ret) {
6933			mlog_errno(ret);
6934			goto out;
6935		}
6936
6937		/*
6938		 * For the 1st allocated cluster, we make it use the same cpos
6939		 * so that the xattr tree looks the same as the original one
6940		 * in the most case.
6941		 */
6942		if (!first_inserted) {
6943			reflink_cpos = cpos;
6944			first_inserted = 1;
6945		}
6946		ret = ocfs2_insert_extent(handle, et, reflink_cpos, new_blkno,
6947					  num_clusters, 0, meta_ac);
6948		if (ret)
6949			mlog_errno(ret);
6950
6951		trace_ocfs2_reflink_xattr_buckets((unsigned long long)new_blkno,
6952						  num_clusters, reflink_cpos);
6953
6954		len -= num_clusters;
6955		blkno += ocfs2_clusters_to_blocks(inode->i_sb, num_clusters);
6956		num_buckets -= reflink_buckets;
6957	}
6958out:
6959	return ret;
6960}
6961
6962/*
6963 * Create the same xattr extent record in the new inode's xattr tree.
6964 */
6965static int ocfs2_reflink_xattr_rec(struct inode *inode,
6966				   struct buffer_head *root_bh,
6967				   u64 blkno,
6968				   u32 cpos,
6969				   u32 len,
6970				   void *para)
6971{
6972	int ret, credits = 0;
6973	handle_t *handle;
6974	struct ocfs2_reflink_xattr_tree_args *args =
6975			(struct ocfs2_reflink_xattr_tree_args *)para;
6976	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
6977	struct ocfs2_alloc_context *meta_ac = NULL;
6978	struct ocfs2_alloc_context *data_ac = NULL;
6979	struct ocfs2_extent_tree et;
6980
6981	trace_ocfs2_reflink_xattr_rec((unsigned long long)blkno, len);
6982
6983	ocfs2_init_xattr_tree_extent_tree(&et,
6984					  INODE_CACHE(args->reflink->new_inode),
6985					  args->new_blk_bh);
6986
6987	ret = ocfs2_lock_reflink_xattr_rec_allocators(args, &et, blkno,
6988						      len, &credits,
6989						      &meta_ac, &data_ac);
6990	if (ret) {
6991		mlog_errno(ret);
6992		goto out;
6993	}
6994
6995	handle = ocfs2_start_trans(osb, credits);
6996	if (IS_ERR(handle)) {
6997		ret = PTR_ERR(handle);
6998		mlog_errno(ret);
6999		goto out;
7000	}
7001
7002	ret = ocfs2_reflink_xattr_buckets(handle, inode, args, &et,
7003					  meta_ac, data_ac,
7004					  blkno, cpos, len);
7005	if (ret)
7006		mlog_errno(ret);
7007
7008	ocfs2_commit_trans(osb, handle);
7009
7010out:
7011	if (meta_ac)
7012		ocfs2_free_alloc_context(meta_ac);
7013	if (data_ac)
7014		ocfs2_free_alloc_context(data_ac);
7015	return ret;
7016}
7017
7018/*
7019 * Create reflinked xattr buckets.
7020 * We will add bucket one by one, and refcount all the xattrs in the bucket
7021 * if they are stored outside.
7022 */
7023static int ocfs2_reflink_xattr_tree(struct ocfs2_xattr_reflink *args,
7024				    struct buffer_head *blk_bh,
7025				    struct buffer_head *new_blk_bh)
7026{
7027	int ret;
7028	struct ocfs2_reflink_xattr_tree_args para;
7029
7030	memset(&para, 0, sizeof(para));
7031	para.reflink = args;
7032	para.old_blk_bh = blk_bh;
7033	para.new_blk_bh = new_blk_bh;
7034
7035	para.old_bucket = ocfs2_xattr_bucket_new(args->old_inode);
7036	if (!para.old_bucket) {
7037		mlog_errno(-ENOMEM);
7038		return -ENOMEM;
7039	}
7040
7041	para.new_bucket = ocfs2_xattr_bucket_new(args->new_inode);
7042	if (!para.new_bucket) {
7043		ret = -ENOMEM;
7044		mlog_errno(ret);
7045		goto out;
7046	}
7047
7048	ret = ocfs2_iterate_xattr_index_block(args->old_inode, blk_bh,
7049					      ocfs2_reflink_xattr_rec,
7050					      &para);
7051	if (ret)
7052		mlog_errno(ret);
7053
7054out:
7055	ocfs2_xattr_bucket_free(para.old_bucket);
7056	ocfs2_xattr_bucket_free(para.new_bucket);
7057	return ret;
7058}
7059
7060static int ocfs2_reflink_xattr_in_block(struct ocfs2_xattr_reflink *args,
7061					struct buffer_head *blk_bh)
7062{
7063	int ret, indexed = 0;
7064	struct buffer_head *new_blk_bh = NULL;
7065	struct ocfs2_xattr_block *xb =
7066			(struct ocfs2_xattr_block *)blk_bh->b_data;
7067
7068
7069	if (le16_to_cpu(xb->xb_flags) & OCFS2_XATTR_INDEXED)
7070		indexed = 1;
7071
7072	ret = ocfs2_create_empty_xattr_block(args->new_inode, args->new_bh,
7073					     &new_blk_bh, indexed);
7074	if (ret) {
7075		mlog_errno(ret);
7076		goto out;
7077	}
7078
7079	if (!indexed)
7080		ret = ocfs2_reflink_xattr_block(args, blk_bh, new_blk_bh);
7081	else
7082		ret = ocfs2_reflink_xattr_tree(args, blk_bh, new_blk_bh);
7083	if (ret)
7084		mlog_errno(ret);
7085
7086out:
7087	brelse(new_blk_bh);
7088	return ret;
7089}
7090
7091static int ocfs2_reflink_xattr_no_security(struct ocfs2_xattr_entry *xe)
7092{
7093	int type = ocfs2_xattr_get_type(xe);
7094
7095	return type != OCFS2_XATTR_INDEX_SECURITY &&
7096	       type != OCFS2_XATTR_INDEX_POSIX_ACL_ACCESS &&
7097	       type != OCFS2_XATTR_INDEX_POSIX_ACL_DEFAULT;
7098}
7099
7100int ocfs2_reflink_xattrs(struct inode *old_inode,
7101			 struct buffer_head *old_bh,
7102			 struct inode *new_inode,
7103			 struct buffer_head *new_bh,
7104			 bool preserve_security)
7105{
7106	int ret;
7107	struct ocfs2_xattr_reflink args;
7108	struct ocfs2_inode_info *oi = OCFS2_I(old_inode);
7109	struct ocfs2_dinode *di = (struct ocfs2_dinode *)old_bh->b_data;
7110	struct buffer_head *blk_bh = NULL;
7111	struct ocfs2_cached_dealloc_ctxt dealloc;
7112	struct ocfs2_refcount_tree *ref_tree;
7113	struct buffer_head *ref_root_bh = NULL;
7114
7115	ret = ocfs2_lock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7116				       le64_to_cpu(di->i_refcount_loc),
7117				       1, &ref_tree, &ref_root_bh);
7118	if (ret) {
7119		mlog_errno(ret);
7120		goto out;
7121	}
7122
7123	ocfs2_init_dealloc_ctxt(&dealloc);
7124
7125	args.old_inode = old_inode;
7126	args.new_inode = new_inode;
7127	args.old_bh = old_bh;
7128	args.new_bh = new_bh;
7129	args.ref_ci = &ref_tree->rf_ci;
7130	args.ref_root_bh = ref_root_bh;
7131	args.dealloc = &dealloc;
7132	if (preserve_security)
7133		args.xattr_reflinked = NULL;
7134	else
7135		args.xattr_reflinked = ocfs2_reflink_xattr_no_security;
7136
7137	if (oi->ip_dyn_features & OCFS2_INLINE_XATTR_FL) {
7138		ret = ocfs2_reflink_xattr_inline(&args);
7139		if (ret) {
7140			mlog_errno(ret);
7141			goto out_unlock;
7142		}
7143	}
7144
7145	if (!di->i_xattr_loc)
7146		goto out_unlock;
7147
7148	ret = ocfs2_read_xattr_block(old_inode, le64_to_cpu(di->i_xattr_loc),
7149				     &blk_bh);
7150	if (ret < 0) {
7151		mlog_errno(ret);
7152		goto out_unlock;
7153	}
7154
7155	ret = ocfs2_reflink_xattr_in_block(&args, blk_bh);
7156	if (ret)
7157		mlog_errno(ret);
7158
7159	brelse(blk_bh);
7160
7161out_unlock:
7162	ocfs2_unlock_refcount_tree(OCFS2_SB(old_inode->i_sb),
7163				   ref_tree, 1);
7164	brelse(ref_root_bh);
7165
7166	if (ocfs2_dealloc_has_cluster(&dealloc)) {
7167		ocfs2_schedule_truncate_log_flush(OCFS2_SB(old_inode->i_sb), 1);
7168		ocfs2_run_deallocs(OCFS2_SB(old_inode->i_sb), &dealloc);
7169	}
7170
7171out:
7172	return ret;
7173}
7174
7175/*
7176 * Initialize security and acl for a already created inode.
7177 * Used for reflink a non-preserve-security file.
7178 *
7179 * It uses common api like ocfs2_xattr_set, so the caller
7180 * must not hold any lock expect i_mutex.
7181 */
7182int ocfs2_init_security_and_acl(struct inode *dir,
7183				struct inode *inode,
7184				const struct qstr *qstr)
7185{
7186	int ret = 0;
7187	struct buffer_head *dir_bh = NULL;
7188	struct ocfs2_security_xattr_info si = {
7189		.enable = 1,
7190	};
7191
7192	ret = ocfs2_init_security_get(inode, dir, qstr, &si);
7193	if (!ret) {
7194		ret = ocfs2_xattr_set(inode, OCFS2_XATTR_INDEX_SECURITY,
7195				      si.name, si.value, si.value_len,
7196				      XATTR_CREATE);
7197		if (ret) {
7198			mlog_errno(ret);
7199			goto leave;
7200		}
7201	} else if (ret != -EOPNOTSUPP) {
7202		mlog_errno(ret);
7203		goto leave;
7204	}
7205
7206	ret = ocfs2_inode_lock(dir, &dir_bh, 0);
7207	if (ret) {
7208		mlog_errno(ret);
7209		goto leave;
7210	}
7211
7212	ret = ocfs2_init_acl(NULL, inode, dir, NULL, dir_bh, NULL, NULL);
7213	if (ret)
7214		mlog_errno(ret);
7215
7216	ocfs2_inode_unlock(dir, 0);
7217	brelse(dir_bh);
7218leave:
7219	return ret;
7220}
 
7221/*
7222 * 'security' attributes support
7223 */
7224static size_t ocfs2_xattr_security_list(struct dentry *dentry, char *list,
7225					size_t list_size, const char *name,
7226					size_t name_len, int type)
7227{
7228	const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
7229	const size_t total_len = prefix_len + name_len + 1;
7230
7231	if (list && total_len <= list_size) {
7232		memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
7233		memcpy(list + prefix_len, name, name_len);
7234		list[prefix_len + name_len] = '\0';
7235	}
7236	return total_len;
7237}
7238
7239static int ocfs2_xattr_security_get(struct dentry *dentry, const char *name,
7240				    void *buffer, size_t size, int type)
 
 
 
7241{
7242	if (strcmp(name, "") == 0)
7243		return -EINVAL;
7244	return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7245			       name, buffer, size);
7246}
7247
7248static int ocfs2_xattr_security_set(struct dentry *dentry, const char *name,
7249		const void *value, size_t size, int flags, int type)
7250{
7251	if (strcmp(name, "") == 0)
7252		return -EINVAL;
7253
7254	return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_SECURITY,
7255			       name, value, size, flags);
 
 
 
 
 
 
7256}
7257
7258int ocfs2_init_security_get(struct inode *inode,
7259			    struct inode *dir,
7260			    const struct qstr *qstr,
7261			    struct ocfs2_security_xattr_info *si)
7262{
7263	/* check whether ocfs2 support feature xattr */
7264	if (!ocfs2_supports_xattr(OCFS2_SB(dir->i_sb)))
7265		return -EOPNOTSUPP;
7266	return security_inode_init_security(inode, dir, qstr, &si->name,
7267					    &si->value, &si->value_len);
 
 
 
 
 
7268}
7269
7270int ocfs2_init_security_set(handle_t *handle,
7271			    struct inode *inode,
7272			    struct buffer_head *di_bh,
7273			    struct ocfs2_security_xattr_info *si,
7274			    struct ocfs2_alloc_context *xattr_ac,
7275			    struct ocfs2_alloc_context *data_ac)
7276{
7277	return ocfs2_xattr_set_handle(handle, inode, di_bh,
7278				     OCFS2_XATTR_INDEX_SECURITY,
7279				     si->name, si->value, si->value_len, 0,
7280				     xattr_ac, data_ac);
7281}
7282
7283const struct xattr_handler ocfs2_xattr_security_handler = {
7284	.prefix	= XATTR_SECURITY_PREFIX,
7285	.list	= ocfs2_xattr_security_list,
7286	.get	= ocfs2_xattr_security_get,
7287	.set	= ocfs2_xattr_security_set,
7288};
7289
7290/*
7291 * 'trusted' attributes support
7292 */
7293static size_t ocfs2_xattr_trusted_list(struct dentry *dentry, char *list,
7294				       size_t list_size, const char *name,
7295				       size_t name_len, int type)
7296{
7297	const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
7298	const size_t total_len = prefix_len + name_len + 1;
7299
7300	if (list && total_len <= list_size) {
7301		memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
7302		memcpy(list + prefix_len, name, name_len);
7303		list[prefix_len + name_len] = '\0';
7304	}
7305	return total_len;
7306}
7307
7308static int ocfs2_xattr_trusted_get(struct dentry *dentry, const char *name,
7309		void *buffer, size_t size, int type)
7310{
7311	if (strcmp(name, "") == 0)
7312		return -EINVAL;
7313	return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7314			       name, buffer, size);
7315}
7316
7317static int ocfs2_xattr_trusted_set(struct dentry *dentry, const char *name,
7318		const void *value, size_t size, int flags, int type)
 
 
 
7319{
7320	if (strcmp(name, "") == 0)
7321		return -EINVAL;
7322
7323	return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_TRUSTED,
7324			       name, value, size, flags);
7325}
7326
7327const struct xattr_handler ocfs2_xattr_trusted_handler = {
7328	.prefix	= XATTR_TRUSTED_PREFIX,
7329	.list	= ocfs2_xattr_trusted_list,
7330	.get	= ocfs2_xattr_trusted_get,
7331	.set	= ocfs2_xattr_trusted_set,
7332};
7333
7334/*
7335 * 'user' attributes support
7336 */
7337static size_t ocfs2_xattr_user_list(struct dentry *dentry, char *list,
7338				    size_t list_size, const char *name,
7339				    size_t name_len, int type)
7340{
7341	const size_t prefix_len = XATTR_USER_PREFIX_LEN;
7342	const size_t total_len = prefix_len + name_len + 1;
7343	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7344
7345	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7346		return 0;
7347
7348	if (list && total_len <= list_size) {
7349		memcpy(list, XATTR_USER_PREFIX, prefix_len);
7350		memcpy(list + prefix_len, name, name_len);
7351		list[prefix_len + name_len] = '\0';
7352	}
7353	return total_len;
7354}
7355
7356static int ocfs2_xattr_user_get(struct dentry *dentry, const char *name,
7357		void *buffer, size_t size, int type)
7358{
7359	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7360
7361	if (strcmp(name, "") == 0)
7362		return -EINVAL;
7363	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7364		return -EOPNOTSUPP;
7365	return ocfs2_xattr_get(dentry->d_inode, OCFS2_XATTR_INDEX_USER, name,
7366			       buffer, size);
7367}
7368
7369static int ocfs2_xattr_user_set(struct dentry *dentry, const char *name,
7370		const void *value, size_t size, int flags, int type)
 
 
 
7371{
7372	struct ocfs2_super *osb = OCFS2_SB(dentry->d_sb);
7373
7374	if (strcmp(name, "") == 0)
7375		return -EINVAL;
7376	if (osb->s_mount_opt & OCFS2_MOUNT_NOUSERXATTR)
7377		return -EOPNOTSUPP;
7378
7379	return ocfs2_xattr_set(dentry->d_inode, OCFS2_XATTR_INDEX_USER,
7380			       name, value, size, flags);
7381}
7382
7383const struct xattr_handler ocfs2_xattr_user_handler = {
7384	.prefix	= XATTR_USER_PREFIX,
7385	.list	= ocfs2_xattr_user_list,
7386	.get	= ocfs2_xattr_user_get,
7387	.set	= ocfs2_xattr_user_set,
7388};