1/*
   2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3 * Copyright (c) 2013 Red Hat, Inc.
   4 * All Rights Reserved.
   5 *
   6 * This program is free software; you can redistribute it and/or
   7 * modify it under the terms of the GNU General Public License as
   8 * published by the Free Software Foundation.
   9 *
  10 * This program is distributed in the hope that it would be useful,
  11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 * GNU General Public License for more details.
  14 *
  15 * You should have received a copy of the GNU General Public License
  16 * along with this program; if not, write the Free Software Foundation,
  17 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  18 */
  19#include "xfs.h"
  20#include "xfs_fs.h"
 
  21#include "xfs_format.h"
  22#include "xfs_log_format.h"
  23#include "xfs_trans_resv.h"
  24#include "xfs_mount.h"
  25#include "xfs_da_format.h"
  26#include "xfs_da_btree.h"
  27#include "xfs_inode.h"
  28#include "xfs_bmap.h"
  29#include "xfs_dir2.h"
  30#include "xfs_dir2_priv.h"
  31#include "xfs_error.h"
  32#include "xfs_trace.h"
  33#include "xfs_trans.h"
  34#include "xfs_buf_item.h"
  35#include "xfs_cksum.h"
  36#include "xfs_log.h"
  37
  38/*
  39 * Function declarations.
  40 */
  41static int xfs_dir2_leafn_add(struct xfs_buf *bp, xfs_da_args_t *args,
  42			      int index);
  43static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state,
  44				     xfs_da_state_blk_t *blk1,
  45				     xfs_da_state_blk_t *blk2);
  46static int xfs_dir2_leafn_remove(xfs_da_args_t *args, struct xfs_buf *bp,
  47				 int index, xfs_da_state_blk_t *dblk,
  48				 int *rval);
  49static int xfs_dir2_node_addname_int(xfs_da_args_t *args,
  50				     xfs_da_state_blk_t *fblk);
  51
  52/*
  53 * Check internal consistency of a leafn block.
  54 */
  55#ifdef DEBUG
  56#define	xfs_dir3_leaf_check(dp, bp) \
  57do { \
  58	if (!xfs_dir3_leafn_check((dp), (bp))) \
  59		ASSERT(0); \
  60} while (0);
  61
  62static bool
  63xfs_dir3_leafn_check(
  64	struct xfs_inode	*dp,
  65	struct xfs_buf		*bp)
  66{
  67	struct xfs_dir2_leaf	*leaf = bp->b_addr;
  68	struct xfs_dir3_icleaf_hdr leafhdr;
  69
  70	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
  71
  72	if (leafhdr.magic == XFS_DIR3_LEAFN_MAGIC) {
  73		struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
  74		if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
  75			return false;
  76	} else if (leafhdr.magic != XFS_DIR2_LEAFN_MAGIC)
  77		return false;
  78
  79	return xfs_dir3_leaf_check_int(dp->i_mount, dp, &leafhdr, leaf);
  80}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  81#else
  82#define	xfs_dir3_leaf_check(dp, bp)
  83#endif
  84
  85static bool
  86xfs_dir3_free_verify(
  87	struct xfs_buf		*bp)
  88{
  89	struct xfs_mount	*mp = bp->b_target->bt_mount;
  90	struct xfs_dir2_free_hdr *hdr = bp->b_addr;
  91
 
 
 
  92	if (xfs_sb_version_hascrc(&mp->m_sb)) {
  93		struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
  94
  95		if (hdr3->magic != cpu_to_be32(XFS_DIR3_FREE_MAGIC))
  96			return false;
  97		if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
  98			return false;
  99		if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
 100			return false;
 101		if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
 102			return false;
 103	} else {
 104		if (hdr->magic != cpu_to_be32(XFS_DIR2_FREE_MAGIC))
 105			return false;
 106	}
 107
 108	/* XXX: should bounds check the xfs_dir3_icfree_hdr here */
 109
 110	return true;
 111}
 112
 113static void
 114xfs_dir3_free_read_verify(
 115	struct xfs_buf	*bp)
 116{
 117	struct xfs_mount	*mp = bp->b_target->bt_mount;
 
 118
 119	if (xfs_sb_version_hascrc(&mp->m_sb) &&
 120	    !xfs_buf_verify_cksum(bp, XFS_DIR3_FREE_CRC_OFF))
 121		xfs_buf_ioerror(bp, -EFSBADCRC);
 122	else if (!xfs_dir3_free_verify(bp))
 123		xfs_buf_ioerror(bp, -EFSCORRUPTED);
 124
 125	if (bp->b_error)
 126		xfs_verifier_error(bp);
 127}
 128
 129static void
 130xfs_dir3_free_write_verify(
 131	struct xfs_buf	*bp)
 132{
 133	struct xfs_mount	*mp = bp->b_target->bt_mount;
 134	struct xfs_buf_log_item	*bip = bp->b_fspriv;
 135	struct xfs_dir3_blk_hdr	*hdr3 = bp->b_addr;
 
 136
 137	if (!xfs_dir3_free_verify(bp)) {
 138		xfs_buf_ioerror(bp, -EFSCORRUPTED);
 139		xfs_verifier_error(bp);
 140		return;
 141	}
 142
 143	if (!xfs_sb_version_hascrc(&mp->m_sb))
 144		return;
 145
 146	if (bip)
 147		hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
 148
 149	xfs_buf_update_cksum(bp, XFS_DIR3_FREE_CRC_OFF);
 150}
 151
 152const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
 153	.name = "xfs_dir3_free",
 
 
 154	.verify_read = xfs_dir3_free_read_verify,
 155	.verify_write = xfs_dir3_free_write_verify,
 
 156};
 157
 158/* Everything ok in the free block header? */
 159static bool
 160xfs_dir3_free_header_check(
 161	struct xfs_inode	*dp,
 162	xfs_dablk_t		fbno,
 163	struct xfs_buf		*bp)
 164{
 165	struct xfs_mount	*mp = dp->i_mount;
 166	unsigned int		firstdb;
 167	int			maxbests;
 168
 169	maxbests = dp->d_ops->free_max_bests(mp->m_dir_geo);
 170	firstdb = (xfs_dir2_da_to_db(mp->m_dir_geo, fbno) -
 171		   xfs_dir2_byte_to_db(mp->m_dir_geo, XFS_DIR2_FREE_OFFSET)) *
 172			maxbests;
 173	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 174		struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
 175
 176		if (be32_to_cpu(hdr3->firstdb) != firstdb)
 177			return false;
 178		if (be32_to_cpu(hdr3->nvalid) > maxbests)
 179			return false;
 180		if (be32_to_cpu(hdr3->nvalid) < be32_to_cpu(hdr3->nused))
 181			return false;
 182	} else {
 183		struct xfs_dir2_free_hdr *hdr = bp->b_addr;
 184
 185		if (be32_to_cpu(hdr->firstdb) != firstdb)
 186			return false;
 187		if (be32_to_cpu(hdr->nvalid) > maxbests)
 188			return false;
 189		if (be32_to_cpu(hdr->nvalid) < be32_to_cpu(hdr->nused))
 190			return false;
 191	}
 192	return true;
 193}
 194
 195static int
 196__xfs_dir3_free_read(
 197	struct xfs_trans	*tp,
 198	struct xfs_inode	*dp,
 199	xfs_dablk_t		fbno,
 200	xfs_daddr_t		mappedbno,
 201	struct xfs_buf		**bpp)
 202{
 
 203	int			err;
 204
 205	err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
 206				XFS_DATA_FORK, &xfs_dir3_free_buf_ops);
 207	if (err || !*bpp)
 208		return err;
 209
 210	/* Check things that we can't do in the verifier. */
 211	if (!xfs_dir3_free_header_check(dp, fbno, *bpp)) {
 212		xfs_buf_ioerror(*bpp, -EFSCORRUPTED);
 213		xfs_verifier_error(*bpp);
 214		xfs_trans_brelse(tp, *bpp);
 215		return -EFSCORRUPTED;
 216	}
 217
 218	/* try read returns without an error or *bpp if it lands in a hole */
 219	if (tp)
 220		xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_FREE_BUF);
 221
 222	return 0;
 223}
 224
 225int
 226xfs_dir2_free_read(
 227	struct xfs_trans	*tp,
 228	struct xfs_inode	*dp,
 229	xfs_dablk_t		fbno,
 230	struct xfs_buf		**bpp)
 231{
 232	return __xfs_dir3_free_read(tp, dp, fbno, -1, bpp);
 233}
 234
 235static int
 236xfs_dir2_free_try_read(
 237	struct xfs_trans	*tp,
 238	struct xfs_inode	*dp,
 239	xfs_dablk_t		fbno,
 240	struct xfs_buf		**bpp)
 241{
 242	return __xfs_dir3_free_read(tp, dp, fbno, -2, bpp);
 243}
 244
 245static int
 246xfs_dir3_free_get_buf(
 247	xfs_da_args_t		*args,
 248	xfs_dir2_db_t		fbno,
 249	struct xfs_buf		**bpp)
 250{
 251	struct xfs_trans	*tp = args->trans;
 252	struct xfs_inode	*dp = args->dp;
 253	struct xfs_mount	*mp = dp->i_mount;
 254	struct xfs_buf		*bp;
 255	int			error;
 256	struct xfs_dir3_icfree_hdr hdr;
 257
 258	error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, fbno),
 259				   -1, &bp, XFS_DATA_FORK);
 260	if (error)
 261		return error;
 262
 263	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_FREE_BUF);
 264	bp->b_ops = &xfs_dir3_free_buf_ops;
 265
 266	/*
 267	 * Initialize the new block to be empty, and remember
 268	 * its first slot as our empty slot.
 269	 */
 270	memset(bp->b_addr, 0, sizeof(struct xfs_dir3_free_hdr));
 271	memset(&hdr, 0, sizeof(hdr));
 272
 273	if (xfs_sb_version_hascrc(&mp->m_sb)) {
 274		struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
 275
 276		hdr.magic = XFS_DIR3_FREE_MAGIC;
 277
 278		hdr3->hdr.blkno = cpu_to_be64(bp->b_bn);
 279		hdr3->hdr.owner = cpu_to_be64(dp->i_ino);
 280		uuid_copy(&hdr3->hdr.uuid, &mp->m_sb.sb_meta_uuid);
 281	} else
 282		hdr.magic = XFS_DIR2_FREE_MAGIC;
 283	dp->d_ops->free_hdr_to_disk(bp->b_addr, &hdr);
 284	*bpp = bp;
 285	return 0;
 286}
 287
 288/*
 289 * Log entries from a freespace block.
 290 */
 291STATIC void
 292xfs_dir2_free_log_bests(
 293	struct xfs_da_args	*args,
 294	struct xfs_buf		*bp,
 295	int			first,		/* first entry to log */
 296	int			last)		/* last entry to log */
 297{
 298	xfs_dir2_free_t		*free;		/* freespace structure */
 299	__be16			*bests;
 300
 301	free = bp->b_addr;
 302	bests = args->dp->d_ops->free_bests_p(free);
 303	ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
 304	       free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
 305	xfs_trans_log_buf(args->trans, bp,
 306		(uint)((char *)&bests[first] - (char *)free),
 307		(uint)((char *)&bests[last] - (char *)free +
 308		       sizeof(bests[0]) - 1));
 309}
 310
 311/*
 312 * Log header from a freespace block.
 313 */
 314static void
 315xfs_dir2_free_log_header(
 316	struct xfs_da_args	*args,
 317	struct xfs_buf		*bp)
 318{
 319#ifdef DEBUG
 320	xfs_dir2_free_t		*free;		/* freespace structure */
 321
 322	free = bp->b_addr;
 323	ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
 324	       free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
 325#endif
 326	xfs_trans_log_buf(args->trans, bp, 0,
 327			  args->dp->d_ops->free_hdr_size - 1);
 328}
 329
 330/*
 331 * Convert a leaf-format directory to a node-format directory.
 332 * We need to change the magic number of the leaf block, and copy
 333 * the freespace table out of the leaf block into its own block.
 334 */
 335int						/* error */
 336xfs_dir2_leaf_to_node(
 337	xfs_da_args_t		*args,		/* operation arguments */
 338	struct xfs_buf		*lbp)		/* leaf buffer */
 339{
 340	xfs_inode_t		*dp;		/* incore directory inode */
 341	int			error;		/* error return value */
 342	struct xfs_buf		*fbp;		/* freespace buffer */
 343	xfs_dir2_db_t		fdb;		/* freespace block number */
 344	xfs_dir2_free_t		*free;		/* freespace structure */
 345	__be16			*from;		/* pointer to freespace entry */
 346	int			i;		/* leaf freespace index */
 347	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
 348	xfs_dir2_leaf_tail_t	*ltp;		/* leaf tail structure */
 349	int			n;		/* count of live freespc ents */
 350	xfs_dir2_data_off_t	off;		/* freespace entry value */
 351	__be16			*to;		/* pointer to freespace entry */
 352	xfs_trans_t		*tp;		/* transaction pointer */
 353	struct xfs_dir3_icfree_hdr freehdr;
 354
 355	trace_xfs_dir2_leaf_to_node(args);
 356
 357	dp = args->dp;
 358	tp = args->trans;
 359	/*
 360	 * Add a freespace block to the directory.
 361	 */
 362	if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) {
 363		return error;
 364	}
 365	ASSERT(fdb == xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET));
 366	/*
 367	 * Get the buffer for the new freespace block.
 368	 */
 369	error = xfs_dir3_free_get_buf(args, fdb, &fbp);
 370	if (error)
 371		return error;
 372
 373	free = fbp->b_addr;
 374	dp->d_ops->free_hdr_from_disk(&freehdr, free);
 375	leaf = lbp->b_addr;
 376	ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
 377	ASSERT(be32_to_cpu(ltp->bestcount) <=
 378				(uint)dp->i_d.di_size / args->geo->blksize);
 
 379
 380	/*
 381	 * Copy freespace entries from the leaf block to the new block.
 382	 * Count active entries.
 383	 */
 384	from = xfs_dir2_leaf_bests_p(ltp);
 385	to = dp->d_ops->free_bests_p(free);
 386	for (i = n = 0; i < be32_to_cpu(ltp->bestcount); i++, from++, to++) {
 387		if ((off = be16_to_cpu(*from)) != NULLDATAOFF)
 388			n++;
 389		*to = cpu_to_be16(off);
 390	}
 391
 392	/*
 393	 * Now initialize the freespace block header.
 394	 */
 395	freehdr.nused = n;
 396	freehdr.nvalid = be32_to_cpu(ltp->bestcount);
 397
 398	dp->d_ops->free_hdr_to_disk(fbp->b_addr, &freehdr);
 399	xfs_dir2_free_log_bests(args, fbp, 0, freehdr.nvalid - 1);
 400	xfs_dir2_free_log_header(args, fbp);
 401
 402	/*
 403	 * Converting the leaf to a leafnode is just a matter of changing the
 404	 * magic number and the ops. Do the change directly to the buffer as
 405	 * it's less work (and less code) than decoding the header to host
 406	 * format and back again.
 407	 */
 408	if (leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC))
 409		leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAFN_MAGIC);
 410	else
 411		leaf->hdr.info.magic = cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
 412	lbp->b_ops = &xfs_dir3_leafn_buf_ops;
 413	xfs_trans_buf_set_type(tp, lbp, XFS_BLFT_DIR_LEAFN_BUF);
 414	xfs_dir3_leaf_log_header(args, lbp);
 415	xfs_dir3_leaf_check(dp, lbp);
 416	return 0;
 417}
 418
 419/*
 420 * Add a leaf entry to a leaf block in a node-form directory.
 421 * The other work necessary is done from the caller.
 422 */
 423static int					/* error */
 424xfs_dir2_leafn_add(
 425	struct xfs_buf		*bp,		/* leaf buffer */
 426	xfs_da_args_t		*args,		/* operation arguments */
 427	int			index)		/* insertion pt for new entry */
 428{
 
 
 
 
 
 429	int			compact;	/* compacting stale leaves */
 430	xfs_inode_t		*dp;		/* incore directory inode */
 431	int			highstale;	/* next stale entry */
 432	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
 433	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry */
 434	int			lfloghigh;	/* high leaf entry logging */
 435	int			lfloglow;	/* low leaf entry logging */
 436	int			lowstale;	/* previous stale entry */
 437	struct xfs_dir3_icleaf_hdr leafhdr;
 438	struct xfs_dir2_leaf_entry *ents;
 439
 440	trace_xfs_dir2_leafn_add(args, index);
 441
 442	dp = args->dp;
 443	leaf = bp->b_addr;
 444	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
 445	ents = dp->d_ops->leaf_ents_p(leaf);
 446
 447	/*
 448	 * Quick check just to make sure we are not going to index
 449	 * into other peoples memory
 450	 */
 451	if (index < 0)
 452		return -EFSCORRUPTED;
 453
 454	/*
 455	 * If there are already the maximum number of leaf entries in
 456	 * the block, if there are no stale entries it won't fit.
 457	 * Caller will do a split.  If there are stale entries we'll do
 458	 * a compact.
 459	 */
 460
 461	if (leafhdr.count == dp->d_ops->leaf_max_ents(args->geo)) {
 462		if (!leafhdr.stale)
 463			return -ENOSPC;
 464		compact = leafhdr.stale > 1;
 465	} else
 466		compact = 0;
 467	ASSERT(index == 0 || be32_to_cpu(ents[index - 1].hashval) <= args->hashval);
 468	ASSERT(index == leafhdr.count ||
 469	       be32_to_cpu(ents[index].hashval) >= args->hashval);
 470
 471	if (args->op_flags & XFS_DA_OP_JUSTCHECK)
 472		return 0;
 473
 474	/*
 475	 * Compact out all but one stale leaf entry.  Leaves behind
 476	 * the entry closest to index.
 477	 */
 478	if (compact)
 479		xfs_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale,
 480					 &highstale, &lfloglow, &lfloghigh);
 481	else if (leafhdr.stale) {
 482		/*
 483		 * Set impossible logging indices for this case.
 484		 */
 485		lfloglow = leafhdr.count;
 486		lfloghigh = -1;
 487	}
 488
 489	/*
 490	 * Insert the new entry, log everything.
 491	 */
 492	lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, index, compact, lowstale,
 493				       highstale, &lfloglow, &lfloghigh);
 494
 495	lep->hashval = cpu_to_be32(args->hashval);
 496	lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(args->geo,
 497				args->blkno, args->index));
 498
 499	dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
 500	xfs_dir3_leaf_log_header(args, bp);
 501	xfs_dir3_leaf_log_ents(args, bp, lfloglow, lfloghigh);
 502	xfs_dir3_leaf_check(dp, bp);
 503	return 0;
 504}
 505
 506#ifdef DEBUG
 507static void
 508xfs_dir2_free_hdr_check(
 509	struct xfs_inode *dp,
 510	struct xfs_buf	*bp,
 511	xfs_dir2_db_t	db)
 512{
 513	struct xfs_dir3_icfree_hdr hdr;
 514
 515	dp->d_ops->free_hdr_from_disk(&hdr, bp->b_addr);
 516
 517	ASSERT((hdr.firstdb %
 518		dp->d_ops->free_max_bests(dp->i_mount->m_dir_geo)) == 0);
 519	ASSERT(hdr.firstdb <= db);
 520	ASSERT(db < hdr.firstdb + hdr.nvalid);
 521}
 522#else
 523#define xfs_dir2_free_hdr_check(dp, bp, db)
 524#endif	/* DEBUG */
 525
 526/*
 527 * Return the last hash value in the leaf.
 528 * Stale entries are ok.
 529 */
 530xfs_dahash_t					/* hash value */
 531xfs_dir2_leafn_lasthash(
 532	struct xfs_inode *dp,
 533	struct xfs_buf	*bp,			/* leaf buffer */
 534	int		*count)			/* count of entries in leaf */
 535{
 536	struct xfs_dir2_leaf	*leaf = bp->b_addr;
 537	struct xfs_dir2_leaf_entry *ents;
 538	struct xfs_dir3_icleaf_hdr leafhdr;
 539
 540	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
 541
 542	ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
 543	       leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
 
 
 544
 545	if (count)
 546		*count = leafhdr.count;
 547	if (!leafhdr.count)
 548		return 0;
 549
 550	ents = dp->d_ops->leaf_ents_p(leaf);
 551	return be32_to_cpu(ents[leafhdr.count - 1].hashval);
 552}
 553
 554/*
 555 * Look up a leaf entry for space to add a name in a node-format leaf block.
 556 * The extrablk in state is a freespace block.
 557 */
 558STATIC int
 559xfs_dir2_leafn_lookup_for_addname(
 560	struct xfs_buf		*bp,		/* leaf buffer */
 561	xfs_da_args_t		*args,		/* operation arguments */
 562	int			*indexp,	/* out: leaf entry index */
 563	xfs_da_state_t		*state)		/* state to fill in */
 564{
 565	struct xfs_buf		*curbp = NULL;	/* current data/free buffer */
 566	xfs_dir2_db_t		curdb = -1;	/* current data block number */
 567	xfs_dir2_db_t		curfdb = -1;	/* current free block number */
 568	xfs_inode_t		*dp;		/* incore directory inode */
 569	int			error;		/* error return value */
 570	int			fi;		/* free entry index */
 571	xfs_dir2_free_t		*free = NULL;	/* free block structure */
 572	int			index;		/* leaf entry index */
 573	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
 574	int			length;		/* length of new data entry */
 575	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry */
 576	xfs_mount_t		*mp;		/* filesystem mount point */
 577	xfs_dir2_db_t		newdb;		/* new data block number */
 578	xfs_dir2_db_t		newfdb;		/* new free block number */
 579	xfs_trans_t		*tp;		/* transaction pointer */
 580	struct xfs_dir2_leaf_entry *ents;
 581	struct xfs_dir3_icleaf_hdr leafhdr;
 582
 583	dp = args->dp;
 584	tp = args->trans;
 585	mp = dp->i_mount;
 586	leaf = bp->b_addr;
 587	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
 588	ents = dp->d_ops->leaf_ents_p(leaf);
 589
 590	xfs_dir3_leaf_check(dp, bp);
 591	ASSERT(leafhdr.count > 0);
 592
 593	/*
 594	 * Look up the hash value in the leaf entries.
 595	 */
 596	index = xfs_dir2_leaf_search_hash(args, bp);
 597	/*
 598	 * Do we have a buffer coming in?
 599	 */
 600	if (state->extravalid) {
 601		/* If so, it's a free block buffer, get the block number. */
 602		curbp = state->extrablk.bp;
 603		curfdb = state->extrablk.blkno;
 604		free = curbp->b_addr;
 605		ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
 606		       free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
 607	}
 608	length = dp->d_ops->data_entsize(args->namelen);
 609	/*
 610	 * Loop over leaf entries with the right hash value.
 611	 */
 612	for (lep = &ents[index];
 613	     index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
 614	     lep++, index++) {
 615		/*
 616		 * Skip stale leaf entries.
 617		 */
 618		if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
 619			continue;
 620		/*
 621		 * Pull the data block number from the entry.
 622		 */
 623		newdb = xfs_dir2_dataptr_to_db(args->geo,
 624					       be32_to_cpu(lep->address));
 625		/*
 626		 * For addname, we're looking for a place to put the new entry.
 627		 * We want to use a data block with an entry of equal
 628		 * hash value to ours if there is one with room.
 629		 *
 630		 * If this block isn't the data block we already have
 631		 * in hand, take a look at it.
 632		 */
 633		if (newdb != curdb) {
 634			__be16 *bests;
 635
 636			curdb = newdb;
 637			/*
 638			 * Convert the data block to the free block
 639			 * holding its freespace information.
 640			 */
 641			newfdb = dp->d_ops->db_to_fdb(args->geo, newdb);
 642			/*
 643			 * If it's not the one we have in hand, read it in.
 644			 */
 645			if (newfdb != curfdb) {
 646				/*
 647				 * If we had one before, drop it.
 648				 */
 649				if (curbp)
 650					xfs_trans_brelse(tp, curbp);
 651
 652				error = xfs_dir2_free_read(tp, dp,
 653						xfs_dir2_db_to_da(args->geo,
 654								  newfdb),
 655						&curbp);
 656				if (error)
 657					return error;
 658				free = curbp->b_addr;
 659
 660				xfs_dir2_free_hdr_check(dp, curbp, curdb);
 661			}
 662			/*
 663			 * Get the index for our entry.
 664			 */
 665			fi = dp->d_ops->db_to_fdindex(args->geo, curdb);
 666			/*
 667			 * If it has room, return it.
 668			 */
 669			bests = dp->d_ops->free_bests_p(free);
 670			if (unlikely(bests[fi] == cpu_to_be16(NULLDATAOFF))) {
 671				XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int",
 672							XFS_ERRLEVEL_LOW, mp);
 673				if (curfdb != newfdb)
 674					xfs_trans_brelse(tp, curbp);
 675				return -EFSCORRUPTED;
 676			}
 677			curfdb = newfdb;
 678			if (be16_to_cpu(bests[fi]) >= length)
 679				goto out;
 680		}
 681	}
 682	/* Didn't find any space */
 683	fi = -1;
 684out:
 685	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
 686	if (curbp) {
 687		/* Giving back a free block. */
 688		state->extravalid = 1;
 689		state->extrablk.bp = curbp;
 690		state->extrablk.index = fi;
 691		state->extrablk.blkno = curfdb;
 692
 693		/*
 694		 * Important: this magic number is not in the buffer - it's for
 695		 * buffer type information and therefore only the free/data type
 696		 * matters here, not whether CRCs are enabled or not.
 697		 */
 698		state->extrablk.magic = XFS_DIR2_FREE_MAGIC;
 699	} else {
 700		state->extravalid = 0;
 701	}
 702	/*
 703	 * Return the index, that will be the insertion point.
 704	 */
 705	*indexp = index;
 706	return -ENOENT;
 707}
 708
 709/*
 710 * Look up a leaf entry in a node-format leaf block.
 711 * The extrablk in state a data block.
 712 */
 713STATIC int
 714xfs_dir2_leafn_lookup_for_entry(
 715	struct xfs_buf		*bp,		/* leaf buffer */
 716	xfs_da_args_t		*args,		/* operation arguments */
 717	int			*indexp,	/* out: leaf entry index */
 718	xfs_da_state_t		*state)		/* state to fill in */
 719{
 720	struct xfs_buf		*curbp = NULL;	/* current data/free buffer */
 721	xfs_dir2_db_t		curdb = -1;	/* current data block number */
 722	xfs_dir2_data_entry_t	*dep;		/* data block entry */
 723	xfs_inode_t		*dp;		/* incore directory inode */
 724	int			error;		/* error return value */
 725	int			index;		/* leaf entry index */
 726	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
 727	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry */
 728	xfs_mount_t		*mp;		/* filesystem mount point */
 729	xfs_dir2_db_t		newdb;		/* new data block number */
 730	xfs_trans_t		*tp;		/* transaction pointer */
 731	enum xfs_dacmp		cmp;		/* comparison result */
 732	struct xfs_dir2_leaf_entry *ents;
 733	struct xfs_dir3_icleaf_hdr leafhdr;
 734
 735	dp = args->dp;
 736	tp = args->trans;
 737	mp = dp->i_mount;
 738	leaf = bp->b_addr;
 739	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
 740	ents = dp->d_ops->leaf_ents_p(leaf);
 741
 742	xfs_dir3_leaf_check(dp, bp);
 743	ASSERT(leafhdr.count > 0);
 
 744
 745	/*
 746	 * Look up the hash value in the leaf entries.
 747	 */
 748	index = xfs_dir2_leaf_search_hash(args, bp);
 749	/*
 750	 * Do we have a buffer coming in?
 751	 */
 752	if (state->extravalid) {
 753		curbp = state->extrablk.bp;
 754		curdb = state->extrablk.blkno;
 755	}
 756	/*
 757	 * Loop over leaf entries with the right hash value.
 758	 */
 759	for (lep = &ents[index];
 760	     index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
 761	     lep++, index++) {
 762		/*
 763		 * Skip stale leaf entries.
 764		 */
 765		if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
 766			continue;
 767		/*
 768		 * Pull the data block number from the entry.
 769		 */
 770		newdb = xfs_dir2_dataptr_to_db(args->geo,
 771					       be32_to_cpu(lep->address));
 772		/*
 773		 * Not adding a new entry, so we really want to find
 774		 * the name given to us.
 775		 *
 776		 * If it's a different data block, go get it.
 777		 */
 778		if (newdb != curdb) {
 779			/*
 780			 * If we had a block before that we aren't saving
 781			 * for a CI name, drop it
 782			 */
 783			if (curbp && (args->cmpresult == XFS_CMP_DIFFERENT ||
 784						curdb != state->extrablk.blkno))
 785				xfs_trans_brelse(tp, curbp);
 786			/*
 787			 * If needing the block that is saved with a CI match,
 788			 * use it otherwise read in the new data block.
 789			 */
 790			if (args->cmpresult != XFS_CMP_DIFFERENT &&
 791					newdb == state->extrablk.blkno) {
 792				ASSERT(state->extravalid);
 793				curbp = state->extrablk.bp;
 794			} else {
 795				error = xfs_dir3_data_read(tp, dp,
 796						xfs_dir2_db_to_da(args->geo,
 797								  newdb),
 798						-1, &curbp);
 799				if (error)
 800					return error;
 801			}
 802			xfs_dir3_data_check(dp, curbp);
 803			curdb = newdb;
 804		}
 805		/*
 806		 * Point to the data entry.
 807		 */
 808		dep = (xfs_dir2_data_entry_t *)((char *)curbp->b_addr +
 809			xfs_dir2_dataptr_to_off(args->geo,
 810						be32_to_cpu(lep->address)));
 811		/*
 812		 * Compare the entry and if it's an exact match, return
 813		 * EEXIST immediately. If it's the first case-insensitive
 814		 * match, store the block & inode number and continue looking.
 815		 */
 816		cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
 817		if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
 818			/* If there is a CI match block, drop it */
 819			if (args->cmpresult != XFS_CMP_DIFFERENT &&
 820						curdb != state->extrablk.blkno)
 821				xfs_trans_brelse(tp, state->extrablk.bp);
 822			args->cmpresult = cmp;
 823			args->inumber = be64_to_cpu(dep->inumber);
 824			args->filetype = dp->d_ops->data_get_ftype(dep);
 825			*indexp = index;
 826			state->extravalid = 1;
 827			state->extrablk.bp = curbp;
 828			state->extrablk.blkno = curdb;
 829			state->extrablk.index = (int)((char *)dep -
 830							(char *)curbp->b_addr);
 831			state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
 832			curbp->b_ops = &xfs_dir3_data_buf_ops;
 833			xfs_trans_buf_set_type(tp, curbp, XFS_BLFT_DIR_DATA_BUF);
 834			if (cmp == XFS_CMP_EXACT)
 835				return -EEXIST;
 836		}
 837	}
 838	ASSERT(index == leafhdr.count || (args->op_flags & XFS_DA_OP_OKNOENT));
 839	if (curbp) {
 840		if (args->cmpresult == XFS_CMP_DIFFERENT) {
 841			/* Giving back last used data block. */
 842			state->extravalid = 1;
 843			state->extrablk.bp = curbp;
 844			state->extrablk.index = -1;
 845			state->extrablk.blkno = curdb;
 846			state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
 847			curbp->b_ops = &xfs_dir3_data_buf_ops;
 848			xfs_trans_buf_set_type(tp, curbp, XFS_BLFT_DIR_DATA_BUF);
 849		} else {
 850			/* If the curbp is not the CI match block, drop it */
 851			if (state->extrablk.bp != curbp)
 852				xfs_trans_brelse(tp, curbp);
 853		}
 854	} else {
 855		state->extravalid = 0;
 856	}
 857	*indexp = index;
 858	return -ENOENT;
 859}
 860
 861/*
 862 * Look up a leaf entry in a node-format leaf block.
 863 * If this is an addname then the extrablk in state is a freespace block,
 864 * otherwise it's a data block.
 865 */
 866int
 867xfs_dir2_leafn_lookup_int(
 868	struct xfs_buf		*bp,		/* leaf buffer */
 869	xfs_da_args_t		*args,		/* operation arguments */
 870	int			*indexp,	/* out: leaf entry index */
 871	xfs_da_state_t		*state)		/* state to fill in */
 872{
 873	if (args->op_flags & XFS_DA_OP_ADDNAME)
 874		return xfs_dir2_leafn_lookup_for_addname(bp, args, indexp,
 875							state);
 876	return xfs_dir2_leafn_lookup_for_entry(bp, args, indexp, state);
 877}
 878
 879/*
 880 * Move count leaf entries from source to destination leaf.
 881 * Log entries and headers.  Stale entries are preserved.
 882 */
 883static void
 884xfs_dir3_leafn_moveents(
 885	xfs_da_args_t			*args,	/* operation arguments */
 886	struct xfs_buf			*bp_s,	/* source */
 887	struct xfs_dir3_icleaf_hdr	*shdr,
 888	struct xfs_dir2_leaf_entry	*sents,
 889	int				start_s,/* source leaf index */
 890	struct xfs_buf			*bp_d,	/* destination */
 891	struct xfs_dir3_icleaf_hdr	*dhdr,
 892	struct xfs_dir2_leaf_entry	*dents,
 893	int				start_d,/* destination leaf index */
 894	int				count)	/* count of leaves to copy */
 895{
 896	int				stale;	/* count stale leaves copied */
 897
 898	trace_xfs_dir2_leafn_moveents(args, start_s, start_d, count);
 899
 900	/*
 901	 * Silently return if nothing to do.
 902	 */
 903	if (count == 0)
 904		return;
 905
 906	/*
 907	 * If the destination index is not the end of the current
 908	 * destination leaf entries, open up a hole in the destination
 909	 * to hold the new entries.
 910	 */
 911	if (start_d < dhdr->count) {
 912		memmove(&dents[start_d + count], &dents[start_d],
 913			(dhdr->count - start_d) * sizeof(xfs_dir2_leaf_entry_t));
 914		xfs_dir3_leaf_log_ents(args, bp_d, start_d + count,
 915				       count + dhdr->count - 1);
 916	}
 917	/*
 918	 * If the source has stale leaves, count the ones in the copy range
 919	 * so we can update the header correctly.
 920	 */
 921	if (shdr->stale) {
 922		int	i;			/* temp leaf index */
 923
 924		for (i = start_s, stale = 0; i < start_s + count; i++) {
 925			if (sents[i].address ==
 926					cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
 927				stale++;
 928		}
 929	} else
 930		stale = 0;
 931	/*
 932	 * Copy the leaf entries from source to destination.
 933	 */
 934	memcpy(&dents[start_d], &sents[start_s],
 935		count * sizeof(xfs_dir2_leaf_entry_t));
 936	xfs_dir3_leaf_log_ents(args, bp_d, start_d, start_d + count - 1);
 937
 938	/*
 939	 * If there are source entries after the ones we copied,
 940	 * delete the ones we copied by sliding the next ones down.
 941	 */
 942	if (start_s + count < shdr->count) {
 943		memmove(&sents[start_s], &sents[start_s + count],
 944			count * sizeof(xfs_dir2_leaf_entry_t));
 945		xfs_dir3_leaf_log_ents(args, bp_s, start_s, start_s + count - 1);
 946	}
 947
 948	/*
 949	 * Update the headers and log them.
 950	 */
 951	shdr->count -= count;
 952	shdr->stale -= stale;
 953	dhdr->count += count;
 954	dhdr->stale += stale;
 955}
 956
 957/*
 958 * Determine the sort order of two leaf blocks.
 959 * Returns 1 if both are valid and leaf2 should be before leaf1, else 0.
 960 */
 961int						/* sort order */
 962xfs_dir2_leafn_order(
 963	struct xfs_inode	*dp,
 964	struct xfs_buf		*leaf1_bp,		/* leaf1 buffer */
 965	struct xfs_buf		*leaf2_bp)		/* leaf2 buffer */
 966{
 967	struct xfs_dir2_leaf	*leaf1 = leaf1_bp->b_addr;
 968	struct xfs_dir2_leaf	*leaf2 = leaf2_bp->b_addr;
 969	struct xfs_dir2_leaf_entry *ents1;
 970	struct xfs_dir2_leaf_entry *ents2;
 971	struct xfs_dir3_icleaf_hdr hdr1;
 972	struct xfs_dir3_icleaf_hdr hdr2;
 973
 974	dp->d_ops->leaf_hdr_from_disk(&hdr1, leaf1);
 975	dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf2);
 976	ents1 = dp->d_ops->leaf_ents_p(leaf1);
 977	ents2 = dp->d_ops->leaf_ents_p(leaf2);
 978
 979	if (hdr1.count > 0 && hdr2.count > 0 &&
 980	    (be32_to_cpu(ents2[0].hashval) < be32_to_cpu(ents1[0].hashval) ||
 981	     be32_to_cpu(ents2[hdr2.count - 1].hashval) <
 982				be32_to_cpu(ents1[hdr1.count - 1].hashval)))
 983		return 1;
 984	return 0;
 985}
 986
 987/*
 988 * Rebalance leaf entries between two leaf blocks.
 989 * This is actually only called when the second block is new,
 990 * though the code deals with the general case.
 991 * A new entry will be inserted in one of the blocks, and that
 992 * entry is taken into account when balancing.
 993 */
 994static void
 995xfs_dir2_leafn_rebalance(
 996	xfs_da_state_t		*state,		/* btree cursor */
 997	xfs_da_state_blk_t	*blk1,		/* first btree block */
 998	xfs_da_state_blk_t	*blk2)		/* second btree block */
 999{
1000	xfs_da_args_t		*args;		/* operation arguments */
1001	int			count;		/* count (& direction) leaves */
1002	int			isleft;		/* new goes in left leaf */
1003	xfs_dir2_leaf_t		*leaf1;		/* first leaf structure */
1004	xfs_dir2_leaf_t		*leaf2;		/* second leaf structure */
1005	int			mid;		/* midpoint leaf index */
1006#if defined(DEBUG) || defined(XFS_WARN)
1007	int			oldstale;	/* old count of stale leaves */
1008#endif
1009	int			oldsum;		/* old total leaf count */
1010	int			swap;		/* swapped leaf blocks */
1011	struct xfs_dir2_leaf_entry *ents1;
1012	struct xfs_dir2_leaf_entry *ents2;
1013	struct xfs_dir3_icleaf_hdr hdr1;
1014	struct xfs_dir3_icleaf_hdr hdr2;
1015	struct xfs_inode	*dp = state->args->dp;
1016
1017	args = state->args;
1018	/*
1019	 * If the block order is wrong, swap the arguments.
1020	 */
1021	if ((swap = xfs_dir2_leafn_order(dp, blk1->bp, blk2->bp))) {
1022		xfs_da_state_blk_t	*tmp;	/* temp for block swap */
 
1023
1024		tmp = blk1;
1025		blk1 = blk2;
1026		blk2 = tmp;
1027	}
1028	leaf1 = blk1->bp->b_addr;
1029	leaf2 = blk2->bp->b_addr;
1030	dp->d_ops->leaf_hdr_from_disk(&hdr1, leaf1);
1031	dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf2);
1032	ents1 = dp->d_ops->leaf_ents_p(leaf1);
1033	ents2 = dp->d_ops->leaf_ents_p(leaf2);
1034
1035	oldsum = hdr1.count + hdr2.count;
1036#if defined(DEBUG) || defined(XFS_WARN)
1037	oldstale = hdr1.stale + hdr2.stale;
1038#endif
1039	mid = oldsum >> 1;
1040
1041	/*
1042	 * If the old leaf count was odd then the new one will be even,
1043	 * so we need to divide the new count evenly.
1044	 */
1045	if (oldsum & 1) {
1046		xfs_dahash_t	midhash;	/* middle entry hash value */
1047
1048		if (mid >= hdr1.count)
1049			midhash = be32_to_cpu(ents2[mid - hdr1.count].hashval);
1050		else
1051			midhash = be32_to_cpu(ents1[mid].hashval);
1052		isleft = args->hashval <= midhash;
1053	}
1054	/*
1055	 * If the old count is even then the new count is odd, so there's
1056	 * no preferred side for the new entry.
1057	 * Pick the left one.
1058	 */
1059	else
1060		isleft = 1;
1061	/*
1062	 * Calculate moved entry count.  Positive means left-to-right,
1063	 * negative means right-to-left.  Then move the entries.
1064	 */
1065	count = hdr1.count - mid + (isleft == 0);
1066	if (count > 0)
1067		xfs_dir3_leafn_moveents(args, blk1->bp, &hdr1, ents1,
1068					hdr1.count - count, blk2->bp,
1069					&hdr2, ents2, 0, count);
1070	else if (count < 0)
1071		xfs_dir3_leafn_moveents(args, blk2->bp, &hdr2, ents2, 0,
1072					blk1->bp, &hdr1, ents1,
1073					hdr1.count, count);
1074
1075	ASSERT(hdr1.count + hdr2.count == oldsum);
1076	ASSERT(hdr1.stale + hdr2.stale == oldstale);
1077
1078	/* log the changes made when moving the entries */
1079	dp->d_ops->leaf_hdr_to_disk(leaf1, &hdr1);
1080	dp->d_ops->leaf_hdr_to_disk(leaf2, &hdr2);
1081	xfs_dir3_leaf_log_header(args, blk1->bp);
1082	xfs_dir3_leaf_log_header(args, blk2->bp);
1083
1084	xfs_dir3_leaf_check(dp, blk1->bp);
1085	xfs_dir3_leaf_check(dp, blk2->bp);
1086
1087	/*
1088	 * Mark whether we're inserting into the old or new leaf.
1089	 */
1090	if (hdr1.count < hdr2.count)
1091		state->inleaf = swap;
1092	else if (hdr1.count > hdr2.count)
1093		state->inleaf = !swap;
1094	else
1095		state->inleaf = swap ^ (blk1->index <= hdr1.count);
1096	/*
1097	 * Adjust the expected index for insertion.
1098	 */
1099	if (!state->inleaf)
1100		blk2->index = blk1->index - hdr1.count;
1101
1102	/*
1103	 * Finally sanity check just to make sure we are not returning a
1104	 * negative index
1105	 */
1106	if (blk2->index < 0) {
1107		state->inleaf = 1;
1108		blk2->index = 0;
1109		xfs_alert(dp->i_mount,
1110	"%s: picked the wrong leaf? reverting original leaf: blk1->index %d",
1111			__func__, blk1->index);
1112	}
1113}
1114
1115static int
1116xfs_dir3_data_block_free(
1117	xfs_da_args_t		*args,
1118	struct xfs_dir2_data_hdr *hdr,
1119	struct xfs_dir2_free	*free,
1120	xfs_dir2_db_t		fdb,
1121	int			findex,
1122	struct xfs_buf		*fbp,
1123	int			longest)
1124{
1125	int			logfree = 0;
1126	__be16			*bests;
1127	struct xfs_dir3_icfree_hdr freehdr;
1128	struct xfs_inode	*dp = args->dp;
1129
1130	dp->d_ops->free_hdr_from_disk(&freehdr, free);
1131	bests = dp->d_ops->free_bests_p(free);
1132	if (hdr) {
1133		/*
1134		 * Data block is not empty, just set the free entry to the new
1135		 * value.
1136		 */
1137		bests[findex] = cpu_to_be16(longest);
1138		xfs_dir2_free_log_bests(args, fbp, findex, findex);
1139		return 0;
1140	}
1141
1142	/* One less used entry in the free table. */
1143	freehdr.nused--;
1144
1145	/*
1146	 * If this was the last entry in the table, we can trim the table size
1147	 * back.  There might be other entries at the end referring to
1148	 * non-existent data blocks, get those too.
1149	 */
1150	if (findex == freehdr.nvalid - 1) {
1151		int	i;		/* free entry index */
1152
1153		for (i = findex - 1; i >= 0; i--) {
1154			if (bests[i] != cpu_to_be16(NULLDATAOFF))
1155				break;
1156		}
1157		freehdr.nvalid = i + 1;
1158		logfree = 0;
1159	} else {
1160		/* Not the last entry, just punch it out.  */
1161		bests[findex] = cpu_to_be16(NULLDATAOFF);
1162		logfree = 1;
1163	}
1164
1165	dp->d_ops->free_hdr_to_disk(free, &freehdr);
1166	xfs_dir2_free_log_header(args, fbp);
1167
1168	/*
1169	 * If there are no useful entries left in the block, get rid of the
1170	 * block if we can.
1171	 */
1172	if (!freehdr.nused) {
1173		int error;
1174
1175		error = xfs_dir2_shrink_inode(args, fdb, fbp);
1176		if (error == 0) {
1177			fbp = NULL;
1178			logfree = 0;
1179		} else if (error != -ENOSPC || args->total != 0)
1180			return error;
1181		/*
1182		 * It's possible to get ENOSPC if there is no
1183		 * space reservation.  In this case some one
1184		 * else will eventually get rid of this block.
1185		 */
1186	}
1187
1188	/* Log the free entry that changed, unless we got rid of it.  */
1189	if (logfree)
1190		xfs_dir2_free_log_bests(args, fbp, findex, findex);
1191	return 0;
1192}
1193
1194/*
1195 * Remove an entry from a node directory.
1196 * This removes the leaf entry and the data entry,
1197 * and updates the free block if necessary.
1198 */
1199static int					/* error */
1200xfs_dir2_leafn_remove(
1201	xfs_da_args_t		*args,		/* operation arguments */
1202	struct xfs_buf		*bp,		/* leaf buffer */
1203	int			index,		/* leaf entry index */
1204	xfs_da_state_blk_t	*dblk,		/* data block */
1205	int			*rval)		/* resulting block needs join */
1206{
1207	xfs_dir2_data_hdr_t	*hdr;		/* data block header */
1208	xfs_dir2_db_t		db;		/* data block number */
1209	struct xfs_buf		*dbp;		/* data block buffer */
1210	xfs_dir2_data_entry_t	*dep;		/* data block entry */
1211	xfs_inode_t		*dp;		/* incore directory inode */
1212	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
1213	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry */
1214	int			longest;	/* longest data free entry */
1215	int			off;		/* data block entry offset */
1216	int			needlog;	/* need to log data header */
1217	int			needscan;	/* need to rescan data frees */
1218	xfs_trans_t		*tp;		/* transaction pointer */
1219	struct xfs_dir2_data_free *bf;		/* bestfree table */
1220	struct xfs_dir3_icleaf_hdr leafhdr;
1221	struct xfs_dir2_leaf_entry *ents;
1222
1223	trace_xfs_dir2_leafn_remove(args, index);
1224
1225	dp = args->dp;
1226	tp = args->trans;
1227	leaf = bp->b_addr;
1228	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
1229	ents = dp->d_ops->leaf_ents_p(leaf);
1230
1231	/*
1232	 * Point to the entry we're removing.
1233	 */
1234	lep = &ents[index];
1235
1236	/*
1237	 * Extract the data block and offset from the entry.
1238	 */
1239	db = xfs_dir2_dataptr_to_db(args->geo, be32_to_cpu(lep->address));
1240	ASSERT(dblk->blkno == db);
1241	off = xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address));
1242	ASSERT(dblk->index == off);
1243
1244	/*
1245	 * Kill the leaf entry by marking it stale.
1246	 * Log the leaf block changes.
1247	 */
1248	leafhdr.stale++;
1249	dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
1250	xfs_dir3_leaf_log_header(args, bp);
1251
1252	lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
1253	xfs_dir3_leaf_log_ents(args, bp, index, index);
1254
1255	/*
1256	 * Make the data entry free.  Keep track of the longest freespace
1257	 * in the data block in case it changes.
1258	 */
1259	dbp = dblk->bp;
1260	hdr = dbp->b_addr;
1261	dep = (xfs_dir2_data_entry_t *)((char *)hdr + off);
1262	bf = dp->d_ops->data_bestfree_p(hdr);
1263	longest = be16_to_cpu(bf[0].length);
1264	needlog = needscan = 0;
1265	xfs_dir2_data_make_free(args, dbp, off,
1266		dp->d_ops->data_entsize(dep->namelen), &needlog, &needscan);
1267	/*
1268	 * Rescan the data block freespaces for bestfree.
1269	 * Log the data block header if needed.
1270	 */
1271	if (needscan)
1272		xfs_dir2_data_freescan(dp, hdr, &needlog);
1273	if (needlog)
1274		xfs_dir2_data_log_header(args, dbp);
1275	xfs_dir3_data_check(dp, dbp);
1276	/*
1277	 * If the longest data block freespace changes, need to update
1278	 * the corresponding freeblock entry.
1279	 */
1280	if (longest < be16_to_cpu(bf[0].length)) {
1281		int		error;		/* error return value */
1282		struct xfs_buf	*fbp;		/* freeblock buffer */
1283		xfs_dir2_db_t	fdb;		/* freeblock block number */
1284		int		findex;		/* index in freeblock entries */
1285		xfs_dir2_free_t	*free;		/* freeblock structure */
1286
1287		/*
1288		 * Convert the data block number to a free block,
1289		 * read in the free block.
1290		 */
1291		fdb = dp->d_ops->db_to_fdb(args->geo, db);
1292		error = xfs_dir2_free_read(tp, dp,
1293					   xfs_dir2_db_to_da(args->geo, fdb),
1294					   &fbp);
1295		if (error)
1296			return error;
1297		free = fbp->b_addr;
1298#ifdef DEBUG
1299	{
1300		struct xfs_dir3_icfree_hdr freehdr;
1301		dp->d_ops->free_hdr_from_disk(&freehdr, free);
1302		ASSERT(freehdr.firstdb == dp->d_ops->free_max_bests(args->geo) *
1303			(fdb - xfs_dir2_byte_to_db(args->geo,
1304						   XFS_DIR2_FREE_OFFSET)));
1305	}
1306#endif
1307		/*
1308		 * Calculate which entry we need to fix.
1309		 */
1310		findex = dp->d_ops->db_to_fdindex(args->geo, db);
1311		longest = be16_to_cpu(bf[0].length);
1312		/*
1313		 * If the data block is now empty we can get rid of it
1314		 * (usually).
1315		 */
1316		if (longest == args->geo->blksize -
1317			       dp->d_ops->data_entry_offset) {
1318			/*
1319			 * Try to punch out the data block.
1320			 */
1321			error = xfs_dir2_shrink_inode(args, db, dbp);
1322			if (error == 0) {
1323				dblk->bp = NULL;
1324				hdr = NULL;
1325			}
1326			/*
1327			 * We can get ENOSPC if there's no space reservation.
1328			 * In this case just drop the buffer and some one else
1329			 * will eventually get rid of the empty block.
1330			 */
1331			else if (!(error == -ENOSPC && args->total == 0))
1332				return error;
1333		}
1334		/*
1335		 * If we got rid of the data block, we can eliminate that entry
1336		 * in the free block.
1337		 */
1338		error = xfs_dir3_data_block_free(args, hdr, free,
1339						 fdb, findex, fbp, longest);
1340		if (error)
1341			return error;
1342	}
1343
1344	xfs_dir3_leaf_check(dp, bp);
1345	/*
1346	 * Return indication of whether this leaf block is empty enough
1347	 * to justify trying to join it with a neighbor.
1348	 */
1349	*rval = (dp->d_ops->leaf_hdr_size +
1350		 (uint)sizeof(ents[0]) * (leafhdr.count - leafhdr.stale)) <
1351		args->geo->magicpct;
1352	return 0;
1353}
1354
1355/*
1356 * Split the leaf entries in the old block into old and new blocks.
1357 */
1358int						/* error */
1359xfs_dir2_leafn_split(
1360	xfs_da_state_t		*state,		/* btree cursor */
1361	xfs_da_state_blk_t	*oldblk,	/* original block */
1362	xfs_da_state_blk_t	*newblk)	/* newly created block */
1363{
1364	xfs_da_args_t		*args;		/* operation arguments */
1365	xfs_dablk_t		blkno;		/* new leaf block number */
1366	int			error;		/* error return value */
1367	struct xfs_inode	*dp;
1368
1369	/*
1370	 * Allocate space for a new leaf node.
1371	 */
1372	args = state->args;
1373	dp = args->dp;
1374	ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC);
1375	error = xfs_da_grow_inode(args, &blkno);
1376	if (error) {
1377		return error;
1378	}
1379	/*
1380	 * Initialize the new leaf block.
1381	 */
1382	error = xfs_dir3_leaf_get_buf(args, xfs_dir2_da_to_db(args->geo, blkno),
1383				      &newblk->bp, XFS_DIR2_LEAFN_MAGIC);
1384	if (error)
1385		return error;
1386
1387	newblk->blkno = blkno;
1388	newblk->magic = XFS_DIR2_LEAFN_MAGIC;
1389	/*
1390	 * Rebalance the entries across the two leaves, link the new
1391	 * block into the leaves.
1392	 */
1393	xfs_dir2_leafn_rebalance(state, oldblk, newblk);
1394	error = xfs_da3_blk_link(state, oldblk, newblk);
1395	if (error) {
1396		return error;
1397	}
1398	/*
1399	 * Insert the new entry in the correct block.
1400	 */
1401	if (state->inleaf)
1402		error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index);
1403	else
1404		error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index);
1405	/*
1406	 * Update last hashval in each block since we added the name.
1407	 */
1408	oldblk->hashval = xfs_dir2_leafn_lasthash(dp, oldblk->bp, NULL);
1409	newblk->hashval = xfs_dir2_leafn_lasthash(dp, newblk->bp, NULL);
1410	xfs_dir3_leaf_check(dp, oldblk->bp);
1411	xfs_dir3_leaf_check(dp, newblk->bp);
1412	return error;
1413}
1414
1415/*
1416 * Check a leaf block and its neighbors to see if the block should be
1417 * collapsed into one or the other neighbor.  Always keep the block
1418 * with the smaller block number.
1419 * If the current block is over 50% full, don't try to join it, return 0.
1420 * If the block is empty, fill in the state structure and return 2.
1421 * If it can be collapsed, fill in the state structure and return 1.
1422 * If nothing can be done, return 0.
1423 */
1424int						/* error */
1425xfs_dir2_leafn_toosmall(
1426	xfs_da_state_t		*state,		/* btree cursor */
1427	int			*action)	/* resulting action to take */
1428{
1429	xfs_da_state_blk_t	*blk;		/* leaf block */
1430	xfs_dablk_t		blkno;		/* leaf block number */
1431	struct xfs_buf		*bp;		/* leaf buffer */
1432	int			bytes;		/* bytes in use */
1433	int			count;		/* leaf live entry count */
1434	int			error;		/* error return value */
1435	int			forward;	/* sibling block direction */
1436	int			i;		/* sibling counter */
1437	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
1438	int			rval;		/* result from path_shift */
1439	struct xfs_dir3_icleaf_hdr leafhdr;
1440	struct xfs_dir2_leaf_entry *ents;
1441	struct xfs_inode	*dp = state->args->dp;
1442
1443	/*
1444	 * Check for the degenerate case of the block being over 50% full.
1445	 * If so, it's not worth even looking to see if we might be able
1446	 * to coalesce with a sibling.
1447	 */
1448	blk = &state->path.blk[state->path.active - 1];
1449	leaf = blk->bp->b_addr;
1450	dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
1451	ents = dp->d_ops->leaf_ents_p(leaf);
1452	xfs_dir3_leaf_check(dp, blk->bp);
1453
1454	count = leafhdr.count - leafhdr.stale;
1455	bytes = dp->d_ops->leaf_hdr_size + count * sizeof(ents[0]);
1456	if (bytes > (state->args->geo->blksize >> 1)) {
1457		/*
1458		 * Blk over 50%, don't try to join.
1459		 */
1460		*action = 0;
1461		return 0;
1462	}
1463	/*
1464	 * Check for the degenerate case of the block being empty.
1465	 * If the block is empty, we'll simply delete it, no need to
1466	 * coalesce it with a sibling block.  We choose (arbitrarily)
1467	 * to merge with the forward block unless it is NULL.
1468	 */
1469	if (count == 0) {
1470		/*
1471		 * Make altpath point to the block we want to keep and
1472		 * path point to the block we want to drop (this one).
1473		 */
1474		forward = (leafhdr.forw != 0);
1475		memcpy(&state->altpath, &state->path, sizeof(state->path));
1476		error = xfs_da3_path_shift(state, &state->altpath, forward, 0,
1477			&rval);
1478		if (error)
1479			return error;
1480		*action = rval ? 2 : 0;
1481		return 0;
1482	}
1483	/*
1484	 * Examine each sibling block to see if we can coalesce with
1485	 * at least 25% free space to spare.  We need to figure out
1486	 * whether to merge with the forward or the backward block.
1487	 * We prefer coalescing with the lower numbered sibling so as
1488	 * to shrink a directory over time.
1489	 */
1490	forward = leafhdr.forw < leafhdr.back;
1491	for (i = 0, bp = NULL; i < 2; forward = !forward, i++) {
1492		struct xfs_dir3_icleaf_hdr hdr2;
1493
1494		blkno = forward ? leafhdr.forw : leafhdr.back;
1495		if (blkno == 0)
1496			continue;
1497		/*
1498		 * Read the sibling leaf block.
1499		 */
1500		error = xfs_dir3_leafn_read(state->args->trans, dp,
1501					    blkno, -1, &bp);
1502		if (error)
1503			return error;
1504
1505		/*
1506		 * Count bytes in the two blocks combined.
1507		 */
1508		count = leafhdr.count - leafhdr.stale;
1509		bytes = state->args->geo->blksize -
1510			(state->args->geo->blksize >> 2);
1511
1512		leaf = bp->b_addr;
1513		dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf);
1514		ents = dp->d_ops->leaf_ents_p(leaf);
1515		count += hdr2.count - hdr2.stale;
1516		bytes -= count * sizeof(ents[0]);
1517
1518		/*
1519		 * Fits with at least 25% to spare.
1520		 */
1521		if (bytes >= 0)
1522			break;
1523		xfs_trans_brelse(state->args->trans, bp);
1524	}
1525	/*
1526	 * Didn't like either block, give up.
1527	 */
1528	if (i >= 2) {
1529		*action = 0;
1530		return 0;
1531	}
1532
1533	/*
1534	 * Make altpath point to the block we want to keep (the lower
1535	 * numbered block) and path point to the block we want to drop.
1536	 */
1537	memcpy(&state->altpath, &state->path, sizeof(state->path));
1538	if (blkno < blk->blkno)
1539		error = xfs_da3_path_shift(state, &state->altpath, forward, 0,
1540			&rval);
1541	else
1542		error = xfs_da3_path_shift(state, &state->path, forward, 0,
1543			&rval);
1544	if (error) {
1545		return error;
1546	}
1547	*action = rval ? 0 : 1;
1548	return 0;
1549}
1550
1551/*
1552 * Move all the leaf entries from drop_blk to save_blk.
1553 * This is done as part of a join operation.
1554 */
1555void
1556xfs_dir2_leafn_unbalance(
1557	xfs_da_state_t		*state,		/* cursor */
1558	xfs_da_state_blk_t	*drop_blk,	/* dead block */
1559	xfs_da_state_blk_t	*save_blk)	/* surviving block */
1560{
1561	xfs_da_args_t		*args;		/* operation arguments */
1562	xfs_dir2_leaf_t		*drop_leaf;	/* dead leaf structure */
1563	xfs_dir2_leaf_t		*save_leaf;	/* surviving leaf structure */
1564	struct xfs_dir3_icleaf_hdr savehdr;
1565	struct xfs_dir3_icleaf_hdr drophdr;
1566	struct xfs_dir2_leaf_entry *sents;
1567	struct xfs_dir2_leaf_entry *dents;
1568	struct xfs_inode	*dp = state->args->dp;
1569
1570	args = state->args;
1571	ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
1572	ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC);
1573	drop_leaf = drop_blk->bp->b_addr;
1574	save_leaf = save_blk->bp->b_addr;
1575
1576	dp->d_ops->leaf_hdr_from_disk(&savehdr, save_leaf);
1577	dp->d_ops->leaf_hdr_from_disk(&drophdr, drop_leaf);
1578	sents = dp->d_ops->leaf_ents_p(save_leaf);
1579	dents = dp->d_ops->leaf_ents_p(drop_leaf);
1580
1581	/*
1582	 * If there are any stale leaf entries, take this opportunity
1583	 * to purge them.
1584	 */
1585	if (drophdr.stale)
1586		xfs_dir3_leaf_compact(args, &drophdr, drop_blk->bp);
1587	if (savehdr.stale)
1588		xfs_dir3_leaf_compact(args, &savehdr, save_blk->bp);
1589
1590	/*
1591	 * Move the entries from drop to the appropriate end of save.
1592	 */
1593	drop_blk->hashval = be32_to_cpu(dents[drophdr.count - 1].hashval);
1594	if (xfs_dir2_leafn_order(dp, save_blk->bp, drop_blk->bp))
1595		xfs_dir3_leafn_moveents(args, drop_blk->bp, &drophdr, dents, 0,
1596					save_blk->bp, &savehdr, sents, 0,
1597					drophdr.count);
1598	else
1599		xfs_dir3_leafn_moveents(args, drop_blk->bp, &drophdr, dents, 0,
1600					save_blk->bp, &savehdr, sents,
1601					savehdr.count, drophdr.count);
1602	save_blk->hashval = be32_to_cpu(sents[savehdr.count - 1].hashval);
1603
1604	/* log the changes made when moving the entries */
1605	dp->d_ops->leaf_hdr_to_disk(save_leaf, &savehdr);
1606	dp->d_ops->leaf_hdr_to_disk(drop_leaf, &drophdr);
1607	xfs_dir3_leaf_log_header(args, save_blk->bp);
1608	xfs_dir3_leaf_log_header(args, drop_blk->bp);
1609
1610	xfs_dir3_leaf_check(dp, save_blk->bp);
1611	xfs_dir3_leaf_check(dp, drop_blk->bp);
1612}
1613
1614/*
1615 * Top-level node form directory addname routine.
 
1616 */
1617int						/* error */
1618xfs_dir2_node_addname(
1619	xfs_da_args_t		*args)		/* operation arguments */
 
 
 
 
 
1620{
1621	xfs_da_state_blk_t	*blk;		/* leaf block for insert */
1622	int			error;		/* error return value */
1623	int			rval;		/* sub-return value */
1624	xfs_da_state_t		*state;		/* btree cursor */
 
 
 
 
 
 
 
 
1625
1626	trace_xfs_dir2_node_addname(args);
 
 
 
 
 
 
 
 
 
 
1627
1628	/*
1629	 * Allocate and initialize the state (btree cursor).
1630	 */
1631	state = xfs_da_state_alloc();
1632	state->args = args;
1633	state->mp = args->dp->i_mount;
1634	/*
1635	 * Look up the name.  We're not supposed to find it, but
1636	 * this gives us the insertion point.
1637	 */
1638	error = xfs_da3_node_lookup_int(state, &rval);
 
 
1639	if (error)
1640		rval = error;
1641	if (rval != -ENOENT) {
1642		goto done;
1643	}
1644	/*
1645	 * Add the data entry to a data block.
1646	 * Extravalid is set to a freeblock found by lookup.
1647	 */
1648	rval = xfs_dir2_node_addname_int(args,
1649		state->extravalid ? &state->extrablk : NULL);
1650	if (rval) {
1651		goto done;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1652	}
1653	blk = &state->path.blk[state->path.active - 1];
1654	ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
 
 
 
 
 
 
 
 
 
1655	/*
1656	 * Add the new leaf entry.
 
1657	 */
1658	rval = xfs_dir2_leafn_add(blk->bp, args, blk->index);
1659	if (rval == 0) {
1660		/*
1661		 * It worked, fix the hash values up the btree.
1662		 */
1663		if (!(args->op_flags & XFS_DA_OP_JUSTCHECK))
1664			xfs_da3_fixhashpath(state, &state->path);
1665	} else {
1666		/*
1667		 * It didn't work, we need to split the leaf block.
1668		 */
1669		if (args->total == 0) {
1670			ASSERT(rval == -ENOSPC);
1671			goto done;
1672		}
1673		/*
1674		 * Split the leaf block and insert the new entry.
1675		 */
1676		rval = xfs_da3_split(state);
1677	}
1678done:
1679	xfs_da_state_free(state);
1680	return rval;
 
 
 
 
 
 
1681}
1682
1683/*
1684 * Add the data entry for a node-format directory name addition.
1685 * The leaf entry is added in xfs_dir2_leafn_add.
1686 * We may enter with a freespace block that the lookup found.
1687 */
1688static int					/* error */
1689xfs_dir2_node_addname_int(
1690	xfs_da_args_t		*args,		/* operation arguments */
1691	xfs_da_state_blk_t	*fblk)		/* optional freespace block */
1692{
1693	xfs_dir2_data_hdr_t	*hdr;		/* data block header */
1694	xfs_dir2_db_t		dbno;		/* data block number */
1695	struct xfs_buf		*dbp;		/* data block buffer */
1696	xfs_dir2_data_entry_t	*dep;		/* data entry pointer */
1697	xfs_inode_t		*dp;		/* incore directory inode */
1698	xfs_dir2_data_unused_t	*dup;		/* data unused entry pointer */
1699	int			error;		/* error return value */
1700	xfs_dir2_db_t		fbno;		/* freespace block number */
1701	struct xfs_buf		*fbp;		/* freespace buffer */
1702	int			findex;		/* freespace entry index */
1703	xfs_dir2_free_t		*free=NULL;	/* freespace block structure */
1704	xfs_dir2_db_t		ifbno;		/* initial freespace block no */
1705	xfs_dir2_db_t		lastfbno=0;	/* highest freespace block no */
1706	int			length;		/* length of the new entry */
1707	int			logfree;	/* need to log free entry */
1708	xfs_mount_t		*mp;		/* filesystem mount point */
1709	int			needlog;	/* need to log data header */
1710	int			needscan;	/* need to rescan data frees */
1711	__be16			*tagp;		/* data entry tag pointer */
1712	xfs_trans_t		*tp;		/* transaction pointer */
1713	__be16			*bests;
1714	struct xfs_dir3_icfree_hdr freehdr;
1715	struct xfs_dir2_data_free *bf;
 
 
 
 
 
 
 
 
 
 
 
 
1716
1717	dp = args->dp;
1718	mp = dp->i_mount;
1719	tp = args->trans;
1720	length = dp->d_ops->data_entsize(args->namelen);
1721	/*
1722	 * If we came in with a freespace block that means that lookup
1723	 * found an entry with our hash value.  This is the freespace
1724	 * block for that data entry.
1725	 */
1726	if (fblk) {
1727		fbp = fblk->bp;
1728		/*
1729		 * Remember initial freespace block number.
1730		 */
1731		ifbno = fblk->blkno;
1732		free = fbp->b_addr;
1733		findex = fblk->index;
1734		bests = dp->d_ops->free_bests_p(free);
1735		dp->d_ops->free_hdr_from_disk(&freehdr, free);
1736
1737		/*
1738		 * This means the free entry showed that the data block had
1739		 * space for our entry, so we remembered it.
1740		 * Use that data block.
1741		 */
1742		if (findex >= 0) {
 
 
 
 
1743			ASSERT(findex < freehdr.nvalid);
1744			ASSERT(be16_to_cpu(bests[findex]) != NULLDATAOFF);
1745			ASSERT(be16_to_cpu(bests[findex]) >= length);
1746			dbno = freehdr.firstdb + findex;
1747		} else {
1748			/*
1749			 * The data block looked at didn't have enough room.
1750			 * We'll start at the beginning of the freespace entries.
1751			 */
1752			dbno = -1;
1753			findex = 0;
1754		}
1755	} else {
1756		/*
1757		 * Didn't come in with a freespace block, so no data block.
 
1758		 */
1759		ifbno = dbno = -1;
 
1760		fbp = NULL;
1761		findex = 0;
1762	}
1763
1764	/*
1765	 * If we don't have a data block yet, we're going to scan the
1766	 * freespace blocks looking for one.  Figure out what the
1767	 * highest freespace block number is.
1768	 */
1769	if (dbno == -1) {
1770		xfs_fileoff_t	fo;		/* freespace block number */
1771
1772		if ((error = xfs_bmap_last_offset(dp, &fo, XFS_DATA_FORK)))
1773			return error;
1774		lastfbno = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)fo);
1775		fbno = ifbno;
1776	}
1777	/*
1778	 * While we haven't identified a data block, search the freeblock
1779	 * data for a good data block.  If we find a null freeblock entry,
1780	 * indicating a hole in the data blocks, remember that.
1781	 */
1782	while (dbno == -1) {
1783		/*
1784		 * If we don't have a freeblock in hand, get the next one.
1785		 */
1786		if (fbp == NULL) {
1787			/*
1788			 * Happens the first time through unless lookup gave
1789			 * us a freespace block to start with.
1790			 */
1791			if (++fbno == 0)
1792				fbno = xfs_dir2_byte_to_db(args->geo,
1793							XFS_DIR2_FREE_OFFSET);
1794			/*
1795			 * If it's ifbno we already looked at it.
1796			 */
1797			if (fbno == ifbno)
1798				fbno++;
1799			/*
1800			 * If it's off the end we're done.
1801			 */
1802			if (fbno >= lastfbno)
1803				break;
1804			/*
1805			 * Read the block.  There can be holes in the
1806			 * freespace blocks, so this might not succeed.
1807			 * This should be really rare, so there's no reason
1808			 * to avoid it.
1809			 */
1810			error = xfs_dir2_free_try_read(tp, dp,
1811					xfs_dir2_db_to_da(args->geo, fbno),
1812					&fbp);
1813			if (error)
1814				return error;
1815			if (!fbp)
1816				continue;
1817			free = fbp->b_addr;
1818			findex = 0;
1819		}
1820		/*
1821		 * Look at the current free entry.  Is it good enough?
1822		 *
1823		 * The bests initialisation should be where the bufer is read in
1824		 * the above branch. But gcc is too stupid to realise that bests
1825		 * and the freehdr are actually initialised if they are placed
1826		 * there, so we have to do it here to avoid warnings. Blech.
1827		 */
1828		bests = dp->d_ops->free_bests_p(free);
1829		dp->d_ops->free_hdr_from_disk(&freehdr, free);
1830		if (be16_to_cpu(bests[findex]) != NULLDATAOFF &&
1831		    be16_to_cpu(bests[findex]) >= length)
1832			dbno = freehdr.firstdb + findex;
1833		else {
1834			/*
1835			 * Are we done with the freeblock?
1836			 */
1837			if (++findex == freehdr.nvalid) {
1838				/*
1839				 * Drop the block.
1840				 */
1841				xfs_trans_brelse(tp, fbp);
1842				fbp = NULL;
1843				if (fblk && fblk->bp)
1844					fblk->bp = NULL;
1845			}
1846		}
1847	}
1848	/*
1849	 * If we don't have a data block, we need to allocate one and make
1850	 * the freespace entries refer to it.
1851	 */
1852	if (unlikely(dbno == -1)) {
1853		/*
1854		 * Not allowed to allocate, return failure.
1855		 */
1856		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
1857			return -ENOSPC;
1858
1859		/*
1860		 * Allocate and initialize the new data block.
1861		 */
1862		if (unlikely((error = xfs_dir2_grow_inode(args,
1863							 XFS_DIR2_DATA_SPACE,
1864							 &dbno)) ||
1865		    (error = xfs_dir3_data_init(args, dbno, &dbp))))
1866			return error;
1867
1868		/*
1869		 * If (somehow) we have a freespace block, get rid of it.
1870		 */
1871		if (fbp)
1872			xfs_trans_brelse(tp, fbp);
1873		if (fblk && fblk->bp)
1874			fblk->bp = NULL;
1875
1876		/*
1877		 * Get the freespace block corresponding to the data block
1878		 * that was just allocated.
 
1879		 */
1880		fbno = dp->d_ops->db_to_fdb(args->geo, dbno);
1881		error = xfs_dir2_free_try_read(tp, dp,
1882				       xfs_dir2_db_to_da(args->geo, fbno),
1883				       &fbp);
1884		if (error)
1885			return error;
 
 
1886
1887		/*
1888		 * If there wasn't a freespace block, the read will
1889		 * return a NULL fbp.  Allocate and initialize a new one.
1890		 */
1891		if (!fbp) {
1892			error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE,
1893						    &fbno);
1894			if (error)
1895				return error;
1896
1897			if (dp->d_ops->db_to_fdb(args->geo, dbno) != fbno) {
1898				xfs_alert(mp,
1899"%s: dir ino %llu needed freesp block %lld for data block %lld, got %lld ifbno %llu lastfbno %d",
1900					__func__, (unsigned long long)dp->i_ino,
1901					(long long)dp->d_ops->db_to_fdb(
1902								args->geo, dbno),
1903					(long long)dbno, (long long)fbno,
1904					(unsigned long long)ifbno, lastfbno);
1905				if (fblk) {
1906					xfs_alert(mp,
1907				" fblk 0x%p blkno %llu index %d magic 0x%x",
1908						fblk,
1909						(unsigned long long)fblk->blkno,
1910						fblk->index,
1911						fblk->magic);
1912				} else {
1913					xfs_alert(mp, " ... fblk is NULL");
1914				}
1915				XFS_ERROR_REPORT("xfs_dir2_node_addname_int",
1916						 XFS_ERRLEVEL_LOW, mp);
1917				return -EFSCORRUPTED;
1918			}
1919
1920			/*
1921			 * Get a buffer for the new block.
1922			 */
1923			error = xfs_dir3_free_get_buf(args, fbno, &fbp);
1924			if (error)
1925				return error;
1926			free = fbp->b_addr;
1927			bests = dp->d_ops->free_bests_p(free);
1928			dp->d_ops->free_hdr_from_disk(&freehdr, free);
1929
1930			/*
1931			 * Remember the first slot as our empty slot.
1932			 */
1933			freehdr.firstdb =
1934				(fbno - xfs_dir2_byte_to_db(args->geo,
1935							XFS_DIR2_FREE_OFFSET)) *
1936					dp->d_ops->free_max_bests(args->geo);
1937		} else {
1938			free = fbp->b_addr;
1939			bests = dp->d_ops->free_bests_p(free);
1940			dp->d_ops->free_hdr_from_disk(&freehdr, free);
1941		}
1942
1943		/*
1944		 * Set the freespace block index from the data block number.
1945		 */
1946		findex = dp->d_ops->db_to_fdindex(args->geo, dbno);
1947		/*
1948		 * If it's after the end of the current entries in the
1949		 * freespace block, extend that table.
1950		 */
1951		if (findex >= freehdr.nvalid) {
1952			ASSERT(findex < dp->d_ops->free_max_bests(args->geo));
1953			freehdr.nvalid = findex + 1;
1954			/*
1955			 * Tag new entry so nused will go up.
1956			 */
1957			bests[findex] = cpu_to_be16(NULLDATAOFF);
1958		}
1959		/*
1960		 * If this entry was for an empty data block
1961		 * (this should always be true) then update the header.
1962		 */
1963		if (bests[findex] == cpu_to_be16(NULLDATAOFF)) {
1964			freehdr.nused++;
1965			dp->d_ops->free_hdr_to_disk(fbp->b_addr, &freehdr);
1966			xfs_dir2_free_log_header(args, fbp);
1967		}
1968		/*
1969		 * Update the real value in the table.
1970		 * We haven't allocated the data entry yet so this will
1971		 * change again.
1972		 */
1973		hdr = dbp->b_addr;
1974		bf = dp->d_ops->data_bestfree_p(hdr);
1975		bests[findex] = bf[0].length;
1976		logfree = 1;
1977	}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1978	/*
1979	 * We had a data block so we don't have to make a new one.
 
1980	 */
1981	else {
1982		/*
1983		 * If just checking, we succeeded.
1984		 */
1985		if (args->op_flags & XFS_DA_OP_JUSTCHECK)
1986			return 0;
1987
1988		/*
1989		 * Read the data block in.
1990		 */
 
 
 
 
 
 
 
 
1991		error = xfs_dir3_data_read(tp, dp,
1992					   xfs_dir2_db_to_da(args->geo, dbno),
1993					   -1, &dbp);
1994		if (error)
1995			return error;
1996		hdr = dbp->b_addr;
1997		bf = dp->d_ops->data_bestfree_p(hdr);
1998		logfree = 0;
1999	}
 
 
 
 
 
 
2000	ASSERT(be16_to_cpu(bf[0].length) >= length);
2001	/*
2002	 * Point to the existing unused space.
2003	 */
2004	dup = (xfs_dir2_data_unused_t *)
2005	      ((char *)hdr + be16_to_cpu(bf[0].offset));
2006	needscan = needlog = 0;
2007	/*
2008	 * Mark the first part of the unused space, inuse for us.
2009	 */
2010	xfs_dir2_data_use_free(args, dbp, dup,
2011		(xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
2012		&needlog, &needscan);
2013	/*
2014	 * Fill in the new entry and log it.
2015	 */
 
2016	dep = (xfs_dir2_data_entry_t *)dup;
2017	dep->inumber = cpu_to_be64(args->inumber);
2018	dep->namelen = args->namelen;
2019	memcpy(dep->name, args->name, dep->namelen);
2020	dp->d_ops->data_put_ftype(dep, args->filetype);
2021	tagp = dp->d_ops->data_entry_tag_p(dep);
2022	*tagp = cpu_to_be16((char *)dep - (char *)hdr);
2023	xfs_dir2_data_log_entry(args, dbp, dep);
2024	/*
2025	 * Rescan the block for bestfree if needed.
2026	 */
2027	if (needscan)
2028		xfs_dir2_data_freescan(dp, hdr, &needlog);
2029	/*
2030	 * Log the data block header if needed.
2031	 */
2032	if (needlog)
2033		xfs_dir2_data_log_header(args, dbp);
2034	/*
2035	 * If the freespace entry is now wrong, update it.
2036	 */
2037	bests = dp->d_ops->free_bests_p(free); /* gcc is so stupid */
2038	if (be16_to_cpu(bests[findex]) != be16_to_cpu(bf[0].length)) {
2039		bests[findex] = bf[0].length;
2040		logfree = 1;
2041	}
2042	/*
2043	 * Log the freespace entry if needed.
2044	 */
2045	if (logfree)
2046		xfs_dir2_free_log_bests(args, fbp, findex, findex);
2047	/*
2048	 * Return the data block and offset in args, then drop the data block.
2049	 */
2050	args->blkno = (xfs_dablk_t)dbno;
2051	args->index = be16_to_cpu(*tagp);
2052	return 0;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2053}
2054
2055/*
2056 * Lookup an entry in a node-format directory.
2057 * All the real work happens in xfs_da3_node_lookup_int.
2058 * The only real output is the inode number of the entry.
2059 */
2060int						/* error */
2061xfs_dir2_node_lookup(
2062	xfs_da_args_t	*args)			/* operation arguments */
2063{
2064	int		error;			/* error return value */
2065	int		i;			/* btree level */
2066	int		rval;			/* operation return value */
2067	xfs_da_state_t	*state;			/* btree cursor */
2068
2069	trace_xfs_dir2_node_lookup(args);
2070
2071	/*
2072	 * Allocate and initialize the btree cursor.
2073	 */
2074	state = xfs_da_state_alloc();
2075	state->args = args;
2076	state->mp = args->dp->i_mount;
2077	/*
2078	 * Fill in the path to the entry in the cursor.
2079	 */
2080	error = xfs_da3_node_lookup_int(state, &rval);
2081	if (error)
2082		rval = error;
2083	else if (rval == -ENOENT && args->cmpresult == XFS_CMP_CASE) {
2084		/* If a CI match, dup the actual name and return -EEXIST */
2085		xfs_dir2_data_entry_t	*dep;
2086
2087		dep = (xfs_dir2_data_entry_t *)
2088			((char *)state->extrablk.bp->b_addr +
2089						 state->extrablk.index);
2090		rval = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
2091	}
2092	/*
2093	 * Release the btree blocks and leaf block.
2094	 */
2095	for (i = 0; i < state->path.active; i++) {
2096		xfs_trans_brelse(args->trans, state->path.blk[i].bp);
2097		state->path.blk[i].bp = NULL;
2098	}
2099	/*
2100	 * Release the data block if we have it.
2101	 */
2102	if (state->extravalid && state->extrablk.bp) {
2103		xfs_trans_brelse(args->trans, state->extrablk.bp);
2104		state->extrablk.bp = NULL;
2105	}
2106	xfs_da_state_free(state);
2107	return rval;
2108}
2109
2110/*
2111 * Remove an entry from a node-format directory.
2112 */
2113int						/* error */
2114xfs_dir2_node_removename(
2115	struct xfs_da_args	*args)		/* operation arguments */
2116{
2117	struct xfs_da_state_blk	*blk;		/* leaf block */
2118	int			error;		/* error return value */
2119	int			rval;		/* operation return value */
2120	struct xfs_da_state	*state;		/* btree cursor */
2121
2122	trace_xfs_dir2_node_removename(args);
2123
2124	/*
2125	 * Allocate and initialize the btree cursor.
2126	 */
2127	state = xfs_da_state_alloc();
2128	state->args = args;
2129	state->mp = args->dp->i_mount;
2130
2131	/* Look up the entry we're deleting, set up the cursor. */
2132	error = xfs_da3_node_lookup_int(state, &rval);
2133	if (error)
2134		goto out_free;
2135
2136	/* Didn't find it, upper layer screwed up. */
2137	if (rval != -EEXIST) {
2138		error = rval;
2139		goto out_free;
2140	}
2141
2142	blk = &state->path.blk[state->path.active - 1];
2143	ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
2144	ASSERT(state->extravalid);
2145	/*
2146	 * Remove the leaf and data entries.
2147	 * Extrablk refers to the data block.
2148	 */
2149	error = xfs_dir2_leafn_remove(args, blk->bp, blk->index,
2150		&state->extrablk, &rval);
2151	if (error)
2152		goto out_free;
2153	/*
2154	 * Fix the hash values up the btree.
2155	 */
2156	xfs_da3_fixhashpath(state, &state->path);
2157	/*
2158	 * If we need to join leaf blocks, do it.
2159	 */
2160	if (rval && state->path.active > 1)
2161		error = xfs_da3_join(state);
2162	/*
2163	 * If no errors so far, try conversion to leaf format.
2164	 */
2165	if (!error)
2166		error = xfs_dir2_node_to_leaf(state);
2167out_free:
2168	xfs_da_state_free(state);
2169	return error;
2170}
2171
2172/*
2173 * Replace an entry's inode number in a node-format directory.
2174 */
2175int						/* error */
2176xfs_dir2_node_replace(
2177	xfs_da_args_t		*args)		/* operation arguments */
2178{
2179	xfs_da_state_blk_t	*blk;		/* leaf block */
2180	xfs_dir2_data_hdr_t	*hdr;		/* data block header */
2181	xfs_dir2_data_entry_t	*dep;		/* data entry changed */
2182	int			error;		/* error return value */
2183	int			i;		/* btree level */
2184	xfs_ino_t		inum;		/* new inode number */
2185	int			ftype;		/* new file type */
2186	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
2187	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry being changed */
2188	int			rval;		/* internal return value */
2189	xfs_da_state_t		*state;		/* btree cursor */
2190
2191	trace_xfs_dir2_node_replace(args);
2192
2193	/*
2194	 * Allocate and initialize the btree cursor.
2195	 */
2196	state = xfs_da_state_alloc();
2197	state->args = args;
2198	state->mp = args->dp->i_mount;
2199
2200	/*
2201	 * We have to save new inode number and ftype since
2202	 * xfs_da3_node_lookup_int() is going to overwrite them
2203	 */
2204	inum = args->inumber;
2205	ftype = args->filetype;
2206
2207	/*
2208	 * Lookup the entry to change in the btree.
2209	 */
2210	error = xfs_da3_node_lookup_int(state, &rval);
2211	if (error) {
2212		rval = error;
2213	}
2214	/*
2215	 * It should be found, since the vnodeops layer has looked it up
2216	 * and locked it.  But paranoia is good.
2217	 */
2218	if (rval == -EEXIST) {
2219		struct xfs_dir2_leaf_entry *ents;
2220		/*
2221		 * Find the leaf entry.
2222		 */
2223		blk = &state->path.blk[state->path.active - 1];
2224		ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
2225		leaf = blk->bp->b_addr;
2226		ents = args->dp->d_ops->leaf_ents_p(leaf);
2227		lep = &ents[blk->index];
2228		ASSERT(state->extravalid);
2229		/*
2230		 * Point to the data entry.
2231		 */
2232		hdr = state->extrablk.bp->b_addr;
2233		ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
2234		       hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC));
2235		dep = (xfs_dir2_data_entry_t *)
2236		      ((char *)hdr +
2237		       xfs_dir2_dataptr_to_off(args->geo,
2238					       be32_to_cpu(lep->address)));
2239		ASSERT(inum != be64_to_cpu(dep->inumber));
2240		/*
2241		 * Fill in the new inode number and log the entry.
2242		 */
2243		dep->inumber = cpu_to_be64(inum);
2244		args->dp->d_ops->data_put_ftype(dep, ftype);
2245		xfs_dir2_data_log_entry(args, state->extrablk.bp, dep);
2246		rval = 0;
2247	}
2248	/*
2249	 * Didn't find it, and we're holding a data block.  Drop it.
2250	 */
2251	else if (state->extravalid) {
2252		xfs_trans_brelse(args->trans, state->extrablk.bp);
2253		state->extrablk.bp = NULL;
2254	}
2255	/*
2256	 * Release all the buffers in the cursor.
2257	 */
2258	for (i = 0; i < state->path.active; i++) {
2259		xfs_trans_brelse(args->trans, state->path.blk[i].bp);
2260		state->path.blk[i].bp = NULL;
2261	}
2262	xfs_da_state_free(state);
2263	return rval;
2264}
2265
2266/*
2267 * Trim off a trailing empty freespace block.
2268 * Return (in rvalp) 1 if we did it, 0 if not.
2269 */
2270int						/* error */
2271xfs_dir2_node_trim_free(
2272	xfs_da_args_t		*args,		/* operation arguments */
2273	xfs_fileoff_t		fo,		/* free block number */
2274	int			*rvalp)		/* out: did something */
2275{
2276	struct xfs_buf		*bp;		/* freespace buffer */
2277	xfs_inode_t		*dp;		/* incore directory inode */
2278	int			error;		/* error return code */
2279	xfs_dir2_free_t		*free;		/* freespace structure */
2280	xfs_trans_t		*tp;		/* transaction pointer */
2281	struct xfs_dir3_icfree_hdr freehdr;
2282
2283	dp = args->dp;
2284	tp = args->trans;
2285
2286	*rvalp = 0;
2287
2288	/*
2289	 * Read the freespace block.
2290	 */
2291	error = xfs_dir2_free_try_read(tp, dp, fo, &bp);
2292	if (error)
2293		return error;
2294	/*
2295	 * There can be holes in freespace.  If fo is a hole, there's
2296	 * nothing to do.
2297	 */
2298	if (!bp)
2299		return 0;
2300	free = bp->b_addr;
2301	dp->d_ops->free_hdr_from_disk(&freehdr, free);
2302
2303	/*
2304	 * If there are used entries, there's nothing to do.
2305	 */
2306	if (freehdr.nused > 0) {
2307		xfs_trans_brelse(tp, bp);
2308		return 0;
2309	}
2310	/*
2311	 * Blow the block away.
2312	 */
2313	error = xfs_dir2_shrink_inode(args,
2314			xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)fo), bp);
2315	if (error) {
2316		/*
2317		 * Can't fail with ENOSPC since that only happens with no
2318		 * space reservation, when breaking up an extent into two
2319		 * pieces.  This is the last block of an extent.
2320		 */
2321		ASSERT(error != -ENOSPC);
2322		xfs_trans_brelse(tp, bp);
2323		return error;
2324	}
2325	/*
2326	 * Return that we succeeded.
2327	 */
2328	*rvalp = 1;
2329	return 0;
2330}