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v4.17
 
   1/*
   2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3 * Copyright (C) 2010 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_shared.h"
  22#include "xfs_format.h"
  23#include "xfs_log_format.h"
  24#include "xfs_trans_resv.h"
  25#include "xfs_mount.h"
  26#include "xfs_inode.h"
  27#include "xfs_extent_busy.h"
  28#include "xfs_quota.h"
  29#include "xfs_trans.h"
  30#include "xfs_trans_priv.h"
  31#include "xfs_log.h"
 
  32#include "xfs_trace.h"
  33#include "xfs_error.h"
 
 
 
 
 
 
 
 
  34
  35kmem_zone_t	*xfs_trans_zone;
  36kmem_zone_t	*xfs_log_item_desc_zone;
  37
  38#if defined(CONFIG_TRACEPOINTS)
  39static void
  40xfs_trans_trace_reservations(
  41	struct xfs_mount	*mp)
  42{
  43	struct xfs_trans_res	resv;
  44	struct xfs_trans_res	*res;
  45	struct xfs_trans_res	*end_res;
  46	int			i;
  47
  48	res = (struct xfs_trans_res *)M_RES(mp);
  49	end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
  50	for (i = 0; res < end_res; i++, res++)
  51		trace_xfs_trans_resv_calc(mp, i, res);
  52	xfs_log_get_max_trans_res(mp, &resv);
  53	trace_xfs_trans_resv_calc(mp, -1, &resv);
  54}
  55#else
  56# define xfs_trans_trace_reservations(mp)
  57#endif
  58
  59/*
  60 * Initialize the precomputed transaction reservation values
  61 * in the mount structure.
  62 */
  63void
  64xfs_trans_init(
  65	struct xfs_mount	*mp)
  66{
  67	xfs_trans_resv_calc(mp, M_RES(mp));
  68	xfs_trans_trace_reservations(mp);
  69}
  70
  71/*
  72 * Free the transaction structure.  If there is more clean up
  73 * to do when the structure is freed, add it here.
  74 */
  75STATIC void
  76xfs_trans_free(
  77	struct xfs_trans	*tp)
  78{
  79	xfs_extent_busy_sort(&tp->t_busy);
  80	xfs_extent_busy_clear(tp->t_mountp, &tp->t_busy, false);
  81
  82	atomic_dec(&tp->t_mountp->m_active_trans);
 
  83	if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
  84		sb_end_intwrite(tp->t_mountp->m_super);
  85	xfs_trans_free_dqinfo(tp);
  86	kmem_zone_free(xfs_trans_zone, tp);
  87}
  88
  89/*
  90 * This is called to create a new transaction which will share the
  91 * permanent log reservation of the given transaction.  The remaining
  92 * unused block and rt extent reservations are also inherited.  This
  93 * implies that the original transaction is no longer allowed to allocate
  94 * blocks.  Locks and log items, however, are no inherited.  They must
  95 * be added to the new transaction explicitly.
  96 */
  97STATIC xfs_trans_t *
  98xfs_trans_dup(
  99	xfs_trans_t	*tp)
 100{
 101	xfs_trans_t	*ntp;
 
 
 102
 103	ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
 104
 105	/*
 106	 * Initialize the new transaction structure.
 107	 */
 108	ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
 109	ntp->t_mountp = tp->t_mountp;
 110	INIT_LIST_HEAD(&ntp->t_items);
 111	INIT_LIST_HEAD(&ntp->t_busy);
 
 
 112
 113	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
 114	ASSERT(tp->t_ticket != NULL);
 115
 116	ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
 117		       (tp->t_flags & XFS_TRANS_RESERVE) |
 118		       (tp->t_flags & XFS_TRANS_NO_WRITECOUNT);
 
 119	/* We gave our writer reference to the new transaction */
 120	tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
 121	ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
 122
 123	ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
 124	ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
 125	tp->t_blk_res = tp->t_blk_res_used;
 126
 127	ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
 128	tp->t_rtx_res = tp->t_rtx_res_used;
 129	ntp->t_pflags = tp->t_pflags;
 130
 131	xfs_trans_dup_dqinfo(tp, ntp);
 132
 133	atomic_inc(&tp->t_mountp->m_active_trans);
 
 
 
 134	return ntp;
 135}
 136
 137/*
 138 * This is called to reserve free disk blocks and log space for the
 139 * given transaction.  This must be done before allocating any resources
 140 * within the transaction.
 141 *
 142 * This will return ENOSPC if there are not enough blocks available.
 143 * It will sleep waiting for available log space.
 144 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
 145 * is used by long running transactions.  If any one of the reservations
 146 * fails then they will all be backed out.
 147 *
 148 * This does not do quota reservations. That typically is done by the
 149 * caller afterwards.
 150 */
 151static int
 152xfs_trans_reserve(
 153	struct xfs_trans	*tp,
 154	struct xfs_trans_res	*resp,
 155	uint			blocks,
 156	uint			rtextents)
 157{
 158	int		error = 0;
 159	bool		rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
 160
 161	/* Mark this thread as being in a transaction */
 162	current_set_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
 163
 164	/*
 165	 * Attempt to reserve the needed disk blocks by decrementing
 166	 * the number needed from the number available.  This will
 167	 * fail if the count would go below zero.
 168	 */
 169	if (blocks > 0) {
 170		error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
 171		if (error != 0) {
 172			current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
 173			return -ENOSPC;
 174		}
 175		tp->t_blk_res += blocks;
 176	}
 177
 178	/*
 179	 * Reserve the log space needed for this transaction.
 180	 */
 181	if (resp->tr_logres > 0) {
 182		bool	permanent = false;
 183
 184		ASSERT(tp->t_log_res == 0 ||
 185		       tp->t_log_res == resp->tr_logres);
 186		ASSERT(tp->t_log_count == 0 ||
 187		       tp->t_log_count == resp->tr_logcount);
 188
 189		if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
 190			tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
 191			permanent = true;
 192		} else {
 193			ASSERT(tp->t_ticket == NULL);
 194			ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
 195		}
 196
 197		if (tp->t_ticket != NULL) {
 198			ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
 199			error = xfs_log_regrant(tp->t_mountp, tp->t_ticket);
 200		} else {
 201			error = xfs_log_reserve(tp->t_mountp,
 202						resp->tr_logres,
 203						resp->tr_logcount,
 204						&tp->t_ticket, XFS_TRANSACTION,
 205						permanent);
 206		}
 207
 208		if (error)
 209			goto undo_blocks;
 210
 211		tp->t_log_res = resp->tr_logres;
 212		tp->t_log_count = resp->tr_logcount;
 213	}
 214
 215	/*
 216	 * Attempt to reserve the needed realtime extents by decrementing
 217	 * the number needed from the number available.  This will
 218	 * fail if the count would go below zero.
 219	 */
 220	if (rtextents > 0) {
 221		error = xfs_mod_frextents(tp->t_mountp, -((int64_t)rtextents));
 222		if (error) {
 223			error = -ENOSPC;
 224			goto undo_log;
 225		}
 226		tp->t_rtx_res += rtextents;
 227	}
 228
 229	return 0;
 230
 231	/*
 232	 * Error cases jump to one of these labels to undo any
 233	 * reservations which have already been performed.
 234	 */
 235undo_log:
 236	if (resp->tr_logres > 0) {
 237		xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, false);
 238		tp->t_ticket = NULL;
 239		tp->t_log_res = 0;
 240		tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
 241	}
 242
 243undo_blocks:
 244	if (blocks > 0) {
 245		xfs_mod_fdblocks(tp->t_mountp, (int64_t)blocks, rsvd);
 246		tp->t_blk_res = 0;
 247	}
 248
 249	current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
 250
 251	return error;
 252}
 253
 254int
 255xfs_trans_alloc(
 256	struct xfs_mount	*mp,
 257	struct xfs_trans_res	*resp,
 258	uint			blocks,
 259	uint			rtextents,
 260	uint			flags,
 261	struct xfs_trans	**tpp)
 262{
 263	struct xfs_trans	*tp;
 
 264	int			error;
 265
 
 
 
 
 
 
 
 266	if (!(flags & XFS_TRANS_NO_WRITECOUNT))
 267		sb_start_intwrite(mp->m_super);
 
 268
 269	WARN_ON(mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
 270	atomic_inc(&mp->m_active_trans);
 
 
 
 
 
 
 271
 272	tp = kmem_zone_zalloc(xfs_trans_zone,
 273		(flags & XFS_TRANS_NOFS) ? KM_NOFS : KM_SLEEP);
 274	tp->t_magic = XFS_TRANS_HEADER_MAGIC;
 275	tp->t_flags = flags;
 276	tp->t_mountp = mp;
 277	INIT_LIST_HEAD(&tp->t_items);
 278	INIT_LIST_HEAD(&tp->t_busy);
 
 
 279
 280	error = xfs_trans_reserve(tp, resp, blocks, rtextents);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 281	if (error) {
 282		xfs_trans_cancel(tp);
 283		return error;
 284	}
 285
 
 
 286	*tpp = tp;
 287	return 0;
 288}
 289
 290/*
 291 * Create an empty transaction with no reservation.  This is a defensive
 292 * mechanism for routines that query metadata without actually modifying
 293 * them -- if the metadata being queried is somehow cross-linked (think a
 294 * btree block pointer that points higher in the tree), we risk deadlock.
 295 * However, blocks grabbed as part of a transaction can be re-grabbed.
 296 * The verifiers will notice the corrupt block and the operation will fail
 297 * back to userspace without deadlocking.
 
 
 
 298 *
 299 * Note the zero-length reservation; this transaction MUST be cancelled
 300 * without any dirty data.
 
 301 */
 302int
 303xfs_trans_alloc_empty(
 304	struct xfs_mount		*mp,
 305	struct xfs_trans		**tpp)
 306{
 307	struct xfs_trans_res		resv = {0};
 308
 309	return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
 310}
 311
 312/*
 313 * Record the indicated change to the given field for application
 314 * to the file system's superblock when the transaction commits.
 315 * For now, just store the change in the transaction structure.
 316 *
 317 * Mark the transaction structure to indicate that the superblock
 318 * needs to be updated before committing.
 319 *
 320 * Because we may not be keeping track of allocated/free inodes and
 321 * used filesystem blocks in the superblock, we do not mark the
 322 * superblock dirty in this transaction if we modify these fields.
 323 * We still need to update the transaction deltas so that they get
 324 * applied to the incore superblock, but we don't want them to
 325 * cause the superblock to get locked and logged if these are the
 326 * only fields in the superblock that the transaction modifies.
 327 */
 328void
 329xfs_trans_mod_sb(
 330	xfs_trans_t	*tp,
 331	uint		field,
 332	int64_t		delta)
 333{
 334	uint32_t	flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
 335	xfs_mount_t	*mp = tp->t_mountp;
 336
 337	switch (field) {
 338	case XFS_TRANS_SB_ICOUNT:
 339		tp->t_icount_delta += delta;
 340		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
 341			flags &= ~XFS_TRANS_SB_DIRTY;
 342		break;
 343	case XFS_TRANS_SB_IFREE:
 344		tp->t_ifree_delta += delta;
 345		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
 346			flags &= ~XFS_TRANS_SB_DIRTY;
 347		break;
 348	case XFS_TRANS_SB_FDBLOCKS:
 349		/*
 350		 * Track the number of blocks allocated in the transaction.
 351		 * Make sure it does not exceed the number reserved. If so,
 352		 * shutdown as this can lead to accounting inconsistency.
 353		 */
 354		if (delta < 0) {
 355			tp->t_blk_res_used += (uint)-delta;
 356			if (tp->t_blk_res_used > tp->t_blk_res)
 357				xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 358		}
 359		tp->t_fdblocks_delta += delta;
 360		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
 361			flags &= ~XFS_TRANS_SB_DIRTY;
 362		break;
 363	case XFS_TRANS_SB_RES_FDBLOCKS:
 364		/*
 365		 * The allocation has already been applied to the
 366		 * in-core superblock's counter.  This should only
 367		 * be applied to the on-disk superblock.
 368		 */
 369		tp->t_res_fdblocks_delta += delta;
 370		if (xfs_sb_version_haslazysbcount(&mp->m_sb))
 371			flags &= ~XFS_TRANS_SB_DIRTY;
 372		break;
 373	case XFS_TRANS_SB_FREXTENTS:
 374		/*
 375		 * Track the number of blocks allocated in the
 376		 * transaction.  Make sure it does not exceed the
 377		 * number reserved.
 378		 */
 379		if (delta < 0) {
 380			tp->t_rtx_res_used += (uint)-delta;
 381			ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
 382		}
 383		tp->t_frextents_delta += delta;
 
 
 384		break;
 385	case XFS_TRANS_SB_RES_FREXTENTS:
 386		/*
 387		 * The allocation has already been applied to the
 388		 * in-core superblock's counter.  This should only
 389		 * be applied to the on-disk superblock.
 390		 */
 391		ASSERT(delta < 0);
 392		tp->t_res_frextents_delta += delta;
 
 
 393		break;
 394	case XFS_TRANS_SB_DBLOCKS:
 395		ASSERT(delta > 0);
 396		tp->t_dblocks_delta += delta;
 397		break;
 398	case XFS_TRANS_SB_AGCOUNT:
 399		ASSERT(delta > 0);
 400		tp->t_agcount_delta += delta;
 401		break;
 402	case XFS_TRANS_SB_IMAXPCT:
 403		tp->t_imaxpct_delta += delta;
 404		break;
 405	case XFS_TRANS_SB_REXTSIZE:
 406		tp->t_rextsize_delta += delta;
 407		break;
 408	case XFS_TRANS_SB_RBMBLOCKS:
 409		tp->t_rbmblocks_delta += delta;
 410		break;
 411	case XFS_TRANS_SB_RBLOCKS:
 412		tp->t_rblocks_delta += delta;
 413		break;
 414	case XFS_TRANS_SB_REXTENTS:
 415		tp->t_rextents_delta += delta;
 416		break;
 417	case XFS_TRANS_SB_REXTSLOG:
 418		tp->t_rextslog_delta += delta;
 419		break;
 
 
 
 
 420	default:
 421		ASSERT(0);
 422		return;
 423	}
 424
 425	tp->t_flags |= flags;
 426}
 427
 428/*
 429 * xfs_trans_apply_sb_deltas() is called from the commit code
 430 * to bring the superblock buffer into the current transaction
 431 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
 432 *
 433 * For now we just look at each field allowed to change and change
 434 * it if necessary.
 435 */
 436STATIC void
 437xfs_trans_apply_sb_deltas(
 438	xfs_trans_t	*tp)
 439{
 440	xfs_dsb_t	*sbp;
 441	xfs_buf_t	*bp;
 442	int		whole = 0;
 443
 444	bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
 445	sbp = XFS_BUF_TO_SBP(bp);
 446
 447	/*
 448	 * Check that superblock mods match the mods made to AGF counters.
 449	 */
 450	ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
 451	       (tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
 452		tp->t_ag_btree_delta));
 453
 454	/*
 455	 * Only update the superblock counters if we are logging them
 456	 */
 457	if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
 458		if (tp->t_icount_delta)
 459			be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
 460		if (tp->t_ifree_delta)
 461			be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
 462		if (tp->t_fdblocks_delta)
 463			be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
 464		if (tp->t_res_fdblocks_delta)
 465			be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
 466	}
 467
 468	if (tp->t_frextents_delta)
 469		be64_add_cpu(&sbp->sb_frextents, tp->t_frextents_delta);
 470	if (tp->t_res_frextents_delta)
 471		be64_add_cpu(&sbp->sb_frextents, tp->t_res_frextents_delta);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 472
 473	if (tp->t_dblocks_delta) {
 474		be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
 475		whole = 1;
 476	}
 477	if (tp->t_agcount_delta) {
 478		be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
 479		whole = 1;
 480	}
 481	if (tp->t_imaxpct_delta) {
 482		sbp->sb_imax_pct += tp->t_imaxpct_delta;
 483		whole = 1;
 484	}
 485	if (tp->t_rextsize_delta) {
 486		be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
 
 
 
 
 
 
 
 
 
 
 
 
 487		whole = 1;
 488	}
 489	if (tp->t_rbmblocks_delta) {
 490		be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
 491		whole = 1;
 492	}
 493	if (tp->t_rblocks_delta) {
 494		be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
 495		whole = 1;
 496	}
 497	if (tp->t_rextents_delta) {
 498		be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
 499		whole = 1;
 500	}
 501	if (tp->t_rextslog_delta) {
 502		sbp->sb_rextslog += tp->t_rextslog_delta;
 503		whole = 1;
 504	}
 
 
 
 
 505
 506	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
 507	if (whole)
 508		/*
 509		 * Log the whole thing, the fields are noncontiguous.
 510		 */
 511		xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
 512	else
 513		/*
 514		 * Since all the modifiable fields are contiguous, we
 515		 * can get away with this.
 516		 */
 517		xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
 518				  offsetof(xfs_dsb_t, sb_frextents) +
 519				  sizeof(sbp->sb_frextents) - 1);
 520}
 521
 522STATIC int
 523xfs_sb_mod8(
 524	uint8_t			*field,
 525	int8_t			delta)
 526{
 527	int8_t			counter = *field;
 528
 529	counter += delta;
 530	if (counter < 0) {
 531		ASSERT(0);
 532		return -EINVAL;
 533	}
 534	*field = counter;
 535	return 0;
 536}
 537
 538STATIC int
 539xfs_sb_mod32(
 540	uint32_t		*field,
 541	int32_t			delta)
 542{
 543	int32_t			counter = *field;
 544
 545	counter += delta;
 546	if (counter < 0) {
 547		ASSERT(0);
 548		return -EINVAL;
 549	}
 550	*field = counter;
 551	return 0;
 552}
 553
 554STATIC int
 555xfs_sb_mod64(
 556	uint64_t		*field,
 557	int64_t			delta)
 558{
 559	int64_t			counter = *field;
 560
 561	counter += delta;
 562	if (counter < 0) {
 563		ASSERT(0);
 564		return -EINVAL;
 565	}
 566	*field = counter;
 567	return 0;
 568}
 569
 570/*
 571 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
 572 * and apply superblock counter changes to the in-core superblock.  The
 573 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
 574 * applied to the in-core superblock.  The idea is that that has already been
 575 * done.
 576 *
 577 * If we are not logging superblock counters, then the inode allocated/free and
 578 * used block counts are not updated in the on disk superblock. In this case,
 579 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
 580 * still need to update the incore superblock with the changes.
 
 
 
 581 */
 
 
 582void
 583xfs_trans_unreserve_and_mod_sb(
 584	struct xfs_trans	*tp)
 585{
 586	struct xfs_mount	*mp = tp->t_mountp;
 587	bool			rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
 588	int64_t			blkdelta = 0;
 589	int64_t			rtxdelta = 0;
 590	int64_t			idelta = 0;
 591	int64_t			ifreedelta = 0;
 592	int			error;
 593
 594	/* calculate deltas */
 595	if (tp->t_blk_res > 0)
 596		blkdelta = tp->t_blk_res;
 597	if ((tp->t_fdblocks_delta != 0) &&
 598	    (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
 599	     (tp->t_flags & XFS_TRANS_SB_DIRTY)))
 
 
 
 
 
 
 
 
 
 600	        blkdelta += tp->t_fdblocks_delta;
 
 
 601
 602	if (tp->t_rtx_res > 0)
 603		rtxdelta = tp->t_rtx_res;
 604	if ((tp->t_frextents_delta != 0) &&
 605	    (tp->t_flags & XFS_TRANS_SB_DIRTY))
 606		rtxdelta += tp->t_frextents_delta;
 
 
 607
 608	if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
 609	     (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
 610		idelta = tp->t_icount_delta;
 611		ifreedelta = tp->t_ifree_delta;
 612	}
 613
 614	/* apply the per-cpu counters */
 615	if (blkdelta) {
 616		error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
 617		if (error)
 618			goto out;
 619	}
 620
 621	if (idelta) {
 622		error = xfs_mod_icount(mp, idelta);
 623		if (error)
 624			goto out_undo_fdblocks;
 625	}
 626
 627	if (ifreedelta) {
 628		error = xfs_mod_ifree(mp, ifreedelta);
 629		if (error)
 630			goto out_undo_icount;
 631	}
 632
 633	if (rtxdelta == 0 && !(tp->t_flags & XFS_TRANS_SB_DIRTY))
 
 
 
 634		return;
 635
 636	/* apply remaining deltas */
 637	spin_lock(&mp->m_sb_lock);
 638	if (rtxdelta) {
 639		error = xfs_sb_mod64(&mp->m_sb.sb_frextents, rtxdelta);
 640		if (error)
 641			goto out_undo_ifree;
 642	}
 643
 644	if (tp->t_dblocks_delta != 0) {
 645		error = xfs_sb_mod64(&mp->m_sb.sb_dblocks, tp->t_dblocks_delta);
 646		if (error)
 647			goto out_undo_frextents;
 648	}
 649	if (tp->t_agcount_delta != 0) {
 650		error = xfs_sb_mod32(&mp->m_sb.sb_agcount, tp->t_agcount_delta);
 651		if (error)
 652			goto out_undo_dblocks;
 653	}
 654	if (tp->t_imaxpct_delta != 0) {
 655		error = xfs_sb_mod8(&mp->m_sb.sb_imax_pct, tp->t_imaxpct_delta);
 656		if (error)
 657			goto out_undo_agcount;
 658	}
 659	if (tp->t_rextsize_delta != 0) {
 660		error = xfs_sb_mod32(&mp->m_sb.sb_rextsize,
 661				     tp->t_rextsize_delta);
 662		if (error)
 663			goto out_undo_imaxpct;
 664	}
 665	if (tp->t_rbmblocks_delta != 0) {
 666		error = xfs_sb_mod32(&mp->m_sb.sb_rbmblocks,
 667				     tp->t_rbmblocks_delta);
 668		if (error)
 669			goto out_undo_rextsize;
 670	}
 671	if (tp->t_rblocks_delta != 0) {
 672		error = xfs_sb_mod64(&mp->m_sb.sb_rblocks, tp->t_rblocks_delta);
 673		if (error)
 674			goto out_undo_rbmblocks;
 675	}
 676	if (tp->t_rextents_delta != 0) {
 677		error = xfs_sb_mod64(&mp->m_sb.sb_rextents,
 678				     tp->t_rextents_delta);
 679		if (error)
 680			goto out_undo_rblocks;
 681	}
 682	if (tp->t_rextslog_delta != 0) {
 683		error = xfs_sb_mod8(&mp->m_sb.sb_rextslog,
 684				     tp->t_rextslog_delta);
 685		if (error)
 686			goto out_undo_rextents;
 687	}
 688	spin_unlock(&mp->m_sb_lock);
 689	return;
 690
 691out_undo_rextents:
 692	if (tp->t_rextents_delta)
 693		xfs_sb_mod64(&mp->m_sb.sb_rextents, -tp->t_rextents_delta);
 694out_undo_rblocks:
 695	if (tp->t_rblocks_delta)
 696		xfs_sb_mod64(&mp->m_sb.sb_rblocks, -tp->t_rblocks_delta);
 697out_undo_rbmblocks:
 698	if (tp->t_rbmblocks_delta)
 699		xfs_sb_mod32(&mp->m_sb.sb_rbmblocks, -tp->t_rbmblocks_delta);
 700out_undo_rextsize:
 701	if (tp->t_rextsize_delta)
 702		xfs_sb_mod32(&mp->m_sb.sb_rextsize, -tp->t_rextsize_delta);
 703out_undo_imaxpct:
 704	if (tp->t_rextsize_delta)
 705		xfs_sb_mod8(&mp->m_sb.sb_imax_pct, -tp->t_imaxpct_delta);
 706out_undo_agcount:
 707	if (tp->t_agcount_delta)
 708		xfs_sb_mod32(&mp->m_sb.sb_agcount, -tp->t_agcount_delta);
 709out_undo_dblocks:
 710	if (tp->t_dblocks_delta)
 711		xfs_sb_mod64(&mp->m_sb.sb_dblocks, -tp->t_dblocks_delta);
 712out_undo_frextents:
 713	if (rtxdelta)
 714		xfs_sb_mod64(&mp->m_sb.sb_frextents, -rtxdelta);
 715out_undo_ifree:
 716	spin_unlock(&mp->m_sb_lock);
 717	if (ifreedelta)
 718		xfs_mod_ifree(mp, -ifreedelta);
 719out_undo_icount:
 720	if (idelta)
 721		xfs_mod_icount(mp, -idelta);
 722out_undo_fdblocks:
 723	if (blkdelta)
 724		xfs_mod_fdblocks(mp, -blkdelta, rsvd);
 725out:
 726	ASSERT(error == 0);
 727	return;
 728}
 729
 730/*
 731 * Add the given log item to the transaction's list of log items.
 732 *
 733 * The log item will now point to its new descriptor with its li_desc field.
 734 */
 735void
 736xfs_trans_add_item(
 737	struct xfs_trans	*tp,
 738	struct xfs_log_item	*lip)
 739{
 740	struct xfs_log_item_desc *lidp;
 741
 742	ASSERT(lip->li_mountp == tp->t_mountp);
 743	ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
 
 
 744
 745	lidp = kmem_zone_zalloc(xfs_log_item_desc_zone, KM_SLEEP | KM_NOFS);
 746
 747	lidp->lid_item = lip;
 748	lidp->lid_flags = 0;
 749	list_add_tail(&lidp->lid_trans, &tp->t_items);
 750
 751	lip->li_desc = lidp;
 752}
 753
 754STATIC void
 755xfs_trans_free_item_desc(
 756	struct xfs_log_item_desc *lidp)
 757{
 758	list_del_init(&lidp->lid_trans);
 759	kmem_zone_free(xfs_log_item_desc_zone, lidp);
 760}
 761
 762/*
 763 * Unlink and free the given descriptor.
 
 
 764 */
 765void
 766xfs_trans_del_item(
 767	struct xfs_log_item	*lip)
 768{
 769	xfs_trans_free_item_desc(lip->li_desc);
 770	lip->li_desc = NULL;
 771}
 772
 773/*
 774 * Unlock all of the items of a transaction and free all the descriptors
 775 * of that transaction.
 776 */
 777void
 778xfs_trans_free_items(
 779	struct xfs_trans	*tp,
 780	xfs_lsn_t		commit_lsn,
 781	bool			abort)
 782{
 783	struct xfs_log_item_desc *lidp, *next;
 784
 785	list_for_each_entry_safe(lidp, next, &tp->t_items, lid_trans) {
 786		struct xfs_log_item	*lip = lidp->lid_item;
 787
 788		lip->li_desc = NULL;
 789
 790		if (commit_lsn != NULLCOMMITLSN)
 791			lip->li_ops->iop_committing(lip, commit_lsn);
 792		if (abort)
 793			lip->li_flags |= XFS_LI_ABORTED;
 794		lip->li_ops->iop_unlock(lip);
 795
 796		xfs_trans_free_item_desc(lidp);
 797	}
 798}
 799
 800static inline void
 801xfs_log_item_batch_insert(
 802	struct xfs_ail		*ailp,
 803	struct xfs_ail_cursor	*cur,
 804	struct xfs_log_item	**log_items,
 805	int			nr_items,
 806	xfs_lsn_t		commit_lsn)
 807{
 808	int	i;
 809
 810	spin_lock(&ailp->ail_lock);
 811	/* xfs_trans_ail_update_bulk drops ailp->ail_lock */
 812	xfs_trans_ail_update_bulk(ailp, cur, log_items, nr_items, commit_lsn);
 813
 814	for (i = 0; i < nr_items; i++) {
 815		struct xfs_log_item *lip = log_items[i];
 816
 817		lip->li_ops->iop_unpin(lip, 0);
 818	}
 819}
 820
 821/*
 822 * Bulk operation version of xfs_trans_committed that takes a log vector of
 823 * items to insert into the AIL. This uses bulk AIL insertion techniques to
 824 * minimise lock traffic.
 
 825 *
 826 * If we are called with the aborted flag set, it is because a log write during
 827 * a CIL checkpoint commit has failed. In this case, all the items in the
 828 * checkpoint have already gone through iop_commited and iop_unlock, which
 829 * means that checkpoint commit abort handling is treated exactly the same
 830 * as an iclog write error even though we haven't started any IO yet. Hence in
 831 * this case all we need to do is iop_committed processing, followed by an
 832 * iop_unpin(aborted) call.
 833 *
 834 * The AIL cursor is used to optimise the insert process. If commit_lsn is not
 835 * at the end of the AIL, the insert cursor avoids the need to walk
 836 * the AIL to find the insertion point on every xfs_log_item_batch_insert()
 837 * call. This saves a lot of needless list walking and is a net win, even
 838 * though it slightly increases that amount of AIL lock traffic to set it up
 839 * and tear it down.
 840 */
 841void
 842xfs_trans_committed_bulk(
 843	struct xfs_ail		*ailp,
 844	struct xfs_log_vec	*log_vector,
 845	xfs_lsn_t		commit_lsn,
 846	int			aborted)
 847{
 848#define LOG_ITEM_BATCH_SIZE	32
 849	struct xfs_log_item	*log_items[LOG_ITEM_BATCH_SIZE];
 850	struct xfs_log_vec	*lv;
 851	struct xfs_ail_cursor	cur;
 852	int			i = 0;
 853
 854	spin_lock(&ailp->ail_lock);
 855	xfs_trans_ail_cursor_last(ailp, &cur, commit_lsn);
 856	spin_unlock(&ailp->ail_lock);
 857
 858	/* unpin all the log items */
 859	for (lv = log_vector; lv; lv = lv->lv_next ) {
 860		struct xfs_log_item	*lip = lv->lv_item;
 861		xfs_lsn_t		item_lsn;
 862
 863		if (aborted)
 864			lip->li_flags |= XFS_LI_ABORTED;
 865		item_lsn = lip->li_ops->iop_committed(lip, commit_lsn);
 866
 867		/* item_lsn of -1 means the item needs no further processing */
 868		if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0)
 869			continue;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 870
 871		/*
 872		 * if we are aborting the operation, no point in inserting the
 873		 * object into the AIL as we are in a shutdown situation.
 874		 */
 875		if (aborted) {
 876			ASSERT(XFS_FORCED_SHUTDOWN(ailp->ail_mount));
 877			lip->li_ops->iop_unpin(lip, 1);
 878			continue;
 879		}
 
 
 
 
 
 880
 881		if (item_lsn != commit_lsn) {
 
 
 
 
 
 882
 883			/*
 884			 * Not a bulk update option due to unusual item_lsn.
 885			 * Push into AIL immediately, rechecking the lsn once
 886			 * we have the ail lock. Then unpin the item. This does
 887			 * not affect the AIL cursor the bulk insert path is
 888			 * using.
 889			 */
 890			spin_lock(&ailp->ail_lock);
 891			if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0)
 892				xfs_trans_ail_update(ailp, lip, item_lsn);
 893			else
 894				spin_unlock(&ailp->ail_lock);
 895			lip->li_ops->iop_unpin(lip, 0);
 896			continue;
 897		}
 898
 899		/* Item is a candidate for bulk AIL insert.  */
 900		log_items[i++] = lv->lv_item;
 901		if (i >= LOG_ITEM_BATCH_SIZE) {
 902			xfs_log_item_batch_insert(ailp, &cur, log_items,
 903					LOG_ITEM_BATCH_SIZE, commit_lsn);
 904			i = 0;
 905		}
 906	}
 907
 908	/* make sure we insert the remainder! */
 909	if (i)
 910		xfs_log_item_batch_insert(ailp, &cur, log_items, i, commit_lsn);
 911
 912	spin_lock(&ailp->ail_lock);
 913	xfs_trans_ail_cursor_done(&cur);
 914	spin_unlock(&ailp->ail_lock);
 915}
 916
 917/*
 918 * Commit the given transaction to the log.
 919 *
 920 * XFS disk error handling mechanism is not based on a typical
 921 * transaction abort mechanism. Logically after the filesystem
 922 * gets marked 'SHUTDOWN', we can't let any new transactions
 923 * be durable - ie. committed to disk - because some metadata might
 924 * be inconsistent. In such cases, this returns an error, and the
 925 * caller may assume that all locked objects joined to the transaction
 926 * have already been unlocked as if the commit had succeeded.
 927 * Do not reference the transaction structure after this call.
 928 */
 929static int
 930__xfs_trans_commit(
 931	struct xfs_trans	*tp,
 932	bool			regrant)
 933{
 934	struct xfs_mount	*mp = tp->t_mountp;
 935	xfs_lsn_t		commit_lsn = -1;
 
 936	int			error = 0;
 937	int			sync = tp->t_flags & XFS_TRANS_SYNC;
 938
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 939	/*
 940	 * If there is nothing to be logged by the transaction,
 941	 * then unlock all of the items associated with the
 942	 * transaction and free the transaction structure.
 943	 * Also make sure to return any reserved blocks to
 944	 * the free pool.
 945	 */
 946	if (!(tp->t_flags & XFS_TRANS_DIRTY))
 947		goto out_unreserve;
 948
 949	if (XFS_FORCED_SHUTDOWN(mp)) {
 
 
 
 
 
 
 950		error = -EIO;
 951		goto out_unreserve;
 952	}
 953
 954	ASSERT(tp->t_ticket != NULL);
 955
 956	/*
 957	 * If we need to update the superblock, then do it now.
 958	 */
 959	if (tp->t_flags & XFS_TRANS_SB_DIRTY)
 960		xfs_trans_apply_sb_deltas(tp);
 961	xfs_trans_apply_dquot_deltas(tp);
 962
 963	xfs_log_commit_cil(mp, tp, &commit_lsn, regrant);
 964
 965	current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
 966	xfs_trans_free(tp);
 967
 968	/*
 969	 * If the transaction needs to be synchronous, then force the
 970	 * log out now and wait for it.
 971	 */
 972	if (sync) {
 973		error = xfs_log_force_lsn(mp, commit_lsn, XFS_LOG_SYNC, NULL);
 974		XFS_STATS_INC(mp, xs_trans_sync);
 975	} else {
 976		XFS_STATS_INC(mp, xs_trans_async);
 977	}
 978
 979	return error;
 980
 981out_unreserve:
 982	xfs_trans_unreserve_and_mod_sb(tp);
 983
 984	/*
 985	 * It is indeed possible for the transaction to be not dirty but
 986	 * the dqinfo portion to be.  All that means is that we have some
 987	 * (non-persistent) quota reservations that need to be unreserved.
 988	 */
 989	xfs_trans_unreserve_and_mod_dquots(tp);
 990	if (tp->t_ticket) {
 991		commit_lsn = xfs_log_done(mp, tp->t_ticket, NULL, regrant);
 992		if (commit_lsn == -1 && !error)
 993			error = -EIO;
 
 
 994	}
 995	current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
 996	xfs_trans_free_items(tp, NULLCOMMITLSN, !!error);
 997	xfs_trans_free(tp);
 998
 999	XFS_STATS_INC(mp, xs_trans_empty);
1000	return error;
1001}
1002
1003int
1004xfs_trans_commit(
1005	struct xfs_trans	*tp)
1006{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1007	return __xfs_trans_commit(tp, false);
1008}
1009
1010/*
1011 * Unlock all of the transaction's items and free the transaction.
1012 * The transaction must not have modified any of its items, because
1013 * there is no way to restore them to their previous state.
 
 
 
1014 *
1015 * If the transaction has made a log reservation, make sure to release
1016 * it as well.
 
 
 
 
 
1017 */
1018void
1019xfs_trans_cancel(
1020	struct xfs_trans	*tp)
1021{
1022	struct xfs_mount	*mp = tp->t_mountp;
 
1023	bool			dirty = (tp->t_flags & XFS_TRANS_DIRTY);
1024
 
 
1025	/*
1026	 * See if the caller is relying on us to shut down the
1027	 * filesystem.  This happens in paths where we detect
1028	 * corruption and decide to give up.
 
1029	 */
1030	if (dirty && !XFS_FORCED_SHUTDOWN(mp)) {
 
 
 
 
 
 
 
 
 
 
 
 
1031		XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1032		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1033	}
1034#ifdef DEBUG
1035	if (!dirty && !XFS_FORCED_SHUTDOWN(mp)) {
1036		struct xfs_log_item_desc *lidp;
 
1037
1038		list_for_each_entry(lidp, &tp->t_items, lid_trans)
1039			ASSERT(!(lidp->lid_item->li_type == XFS_LI_EFD));
1040	}
1041#endif
1042	xfs_trans_unreserve_and_mod_sb(tp);
1043	xfs_trans_unreserve_and_mod_dquots(tp);
1044
1045	if (tp->t_ticket)
1046		xfs_log_done(mp, tp->t_ticket, NULL, false);
1047
1048	/* mark this thread as no longer being in a transaction */
1049	current_restore_flags_nested(&tp->t_pflags, PF_MEMALLOC_NOFS);
 
 
1050
1051	xfs_trans_free_items(tp, NULLCOMMITLSN, dirty);
1052	xfs_trans_free(tp);
1053}
1054
1055/*
1056 * Roll from one trans in the sequence of PERMANENT transactions to
1057 * the next: permanent transactions are only flushed out when
1058 * committed with xfs_trans_commit(), but we still want as soon
1059 * as possible to let chunks of it go to the log. So we commit the
1060 * chunk we've been working on and get a new transaction to continue.
1061 */
1062int
1063xfs_trans_roll(
1064	struct xfs_trans	**tpp)
1065{
1066	struct xfs_trans	*trans = *tpp;
1067	struct xfs_trans_res	tres;
1068	int			error;
1069
 
 
1070	/*
1071	 * Copy the critical parameters from one trans to the next.
1072	 */
1073	tres.tr_logres = trans->t_log_res;
1074	tres.tr_logcount = trans->t_log_count;
1075
1076	*tpp = xfs_trans_dup(trans);
1077
1078	/*
1079	 * Commit the current transaction.
1080	 * If this commit failed, then it'd just unlock those items that
1081	 * are not marked ihold. That also means that a filesystem shutdown
1082	 * is in progress. The caller takes the responsibility to cancel
1083	 * the duplicate transaction that gets returned.
1084	 */
1085	error = __xfs_trans_commit(trans, true);
1086	if (error)
1087		return error;
1088
1089	/*
1090	 * Reserve space in the log for the next transaction.
1091	 * This also pushes items in the "AIL", the list of logged items,
1092	 * out to disk if they are taking up space at the tail of the log
1093	 * that we want to use.  This requires that either nothing be locked
1094	 * across this call, or that anything that is locked be logged in
1095	 * the prior and the next transactions.
1096	 */
1097	tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1098	return xfs_trans_reserve(*tpp, &tres, 0, 0);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1099}
v6.13.7
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   4 * Copyright (C) 2010 Red Hat, Inc.
   5 * All Rights Reserved.
 
 
 
 
 
 
 
 
 
 
 
 
 
   6 */
   7#include "xfs.h"
   8#include "xfs_fs.h"
   9#include "xfs_shared.h"
  10#include "xfs_format.h"
  11#include "xfs_log_format.h"
  12#include "xfs_trans_resv.h"
  13#include "xfs_mount.h"
 
  14#include "xfs_extent_busy.h"
  15#include "xfs_quota.h"
  16#include "xfs_trans.h"
  17#include "xfs_trans_priv.h"
  18#include "xfs_log.h"
  19#include "xfs_log_priv.h"
  20#include "xfs_trace.h"
  21#include "xfs_error.h"
  22#include "xfs_defer.h"
  23#include "xfs_inode.h"
  24#include "xfs_dquot_item.h"
  25#include "xfs_dquot.h"
  26#include "xfs_icache.h"
  27#include "xfs_rtbitmap.h"
  28#include "xfs_rtgroup.h"
  29#include "xfs_sb.h"
  30
  31struct kmem_cache	*xfs_trans_cache;
 
  32
  33#if defined(CONFIG_TRACEPOINTS)
  34static void
  35xfs_trans_trace_reservations(
  36	struct xfs_mount	*mp)
  37{
 
  38	struct xfs_trans_res	*res;
  39	struct xfs_trans_res	*end_res;
  40	int			i;
  41
  42	res = (struct xfs_trans_res *)M_RES(mp);
  43	end_res = (struct xfs_trans_res *)(M_RES(mp) + 1);
  44	for (i = 0; res < end_res; i++, res++)
  45		trace_xfs_trans_resv_calc(mp, i, res);
 
 
  46}
  47#else
  48# define xfs_trans_trace_reservations(mp)
  49#endif
  50
  51/*
  52 * Initialize the precomputed transaction reservation values
  53 * in the mount structure.
  54 */
  55void
  56xfs_trans_init(
  57	struct xfs_mount	*mp)
  58{
  59	xfs_trans_resv_calc(mp, M_RES(mp));
  60	xfs_trans_trace_reservations(mp);
  61}
  62
  63/*
  64 * Free the transaction structure.  If there is more clean up
  65 * to do when the structure is freed, add it here.
  66 */
  67STATIC void
  68xfs_trans_free(
  69	struct xfs_trans	*tp)
  70{
  71	xfs_extent_busy_sort(&tp->t_busy);
  72	xfs_extent_busy_clear(&tp->t_busy, false);
  73
  74	trace_xfs_trans_free(tp, _RET_IP_);
  75	xfs_trans_clear_context(tp);
  76	if (!(tp->t_flags & XFS_TRANS_NO_WRITECOUNT))
  77		sb_end_intwrite(tp->t_mountp->m_super);
  78	xfs_trans_free_dqinfo(tp);
  79	kmem_cache_free(xfs_trans_cache, tp);
  80}
  81
  82/*
  83 * This is called to create a new transaction which will share the
  84 * permanent log reservation of the given transaction.  The remaining
  85 * unused block and rt extent reservations are also inherited.  This
  86 * implies that the original transaction is no longer allowed to allocate
  87 * blocks.  Locks and log items, however, are no inherited.  They must
  88 * be added to the new transaction explicitly.
  89 */
  90STATIC struct xfs_trans *
  91xfs_trans_dup(
  92	struct xfs_trans	*tp)
  93{
  94	struct xfs_trans	*ntp;
  95
  96	trace_xfs_trans_dup(tp, _RET_IP_);
  97
  98	ntp = kmem_cache_zalloc(xfs_trans_cache, GFP_KERNEL | __GFP_NOFAIL);
  99
 100	/*
 101	 * Initialize the new transaction structure.
 102	 */
 103	ntp->t_magic = XFS_TRANS_HEADER_MAGIC;
 104	ntp->t_mountp = tp->t_mountp;
 105	INIT_LIST_HEAD(&ntp->t_items);
 106	INIT_LIST_HEAD(&ntp->t_busy);
 107	INIT_LIST_HEAD(&ntp->t_dfops);
 108	ntp->t_highest_agno = NULLAGNUMBER;
 109
 110	ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
 111	ASSERT(tp->t_ticket != NULL);
 112
 113	ntp->t_flags = XFS_TRANS_PERM_LOG_RES |
 114		       (tp->t_flags & XFS_TRANS_RESERVE) |
 115		       (tp->t_flags & XFS_TRANS_NO_WRITECOUNT) |
 116		       (tp->t_flags & XFS_TRANS_RES_FDBLKS);
 117	/* We gave our writer reference to the new transaction */
 118	tp->t_flags |= XFS_TRANS_NO_WRITECOUNT;
 119	ntp->t_ticket = xfs_log_ticket_get(tp->t_ticket);
 120
 121	ASSERT(tp->t_blk_res >= tp->t_blk_res_used);
 122	ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
 123	tp->t_blk_res = tp->t_blk_res_used;
 124
 125	ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
 126	tp->t_rtx_res = tp->t_rtx_res_used;
 
 127
 128	xfs_trans_switch_context(tp, ntp);
 129
 130	/* move deferred ops over to the new tp */
 131	xfs_defer_move(ntp, tp);
 132
 133	xfs_trans_dup_dqinfo(tp, ntp);
 134	return ntp;
 135}
 136
 137/*
 138 * This is called to reserve free disk blocks and log space for the
 139 * given transaction.  This must be done before allocating any resources
 140 * within the transaction.
 141 *
 142 * This will return ENOSPC if there are not enough blocks available.
 143 * It will sleep waiting for available log space.
 144 * The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
 145 * is used by long running transactions.  If any one of the reservations
 146 * fails then they will all be backed out.
 147 *
 148 * This does not do quota reservations. That typically is done by the
 149 * caller afterwards.
 150 */
 151static int
 152xfs_trans_reserve(
 153	struct xfs_trans	*tp,
 154	struct xfs_trans_res	*resp,
 155	uint			blocks,
 156	uint			rtextents)
 157{
 158	struct xfs_mount	*mp = tp->t_mountp;
 159	int			error = 0;
 160	bool			rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
 
 
 161
 162	/*
 163	 * Attempt to reserve the needed disk blocks by decrementing
 164	 * the number needed from the number available.  This will
 165	 * fail if the count would go below zero.
 166	 */
 167	if (blocks > 0) {
 168		error = xfs_dec_fdblocks(mp, blocks, rsvd);
 169		if (error != 0)
 
 170			return -ENOSPC;
 
 171		tp->t_blk_res += blocks;
 172	}
 173
 174	/*
 175	 * Reserve the log space needed for this transaction.
 176	 */
 177	if (resp->tr_logres > 0) {
 178		bool	permanent = false;
 179
 180		ASSERT(tp->t_log_res == 0 ||
 181		       tp->t_log_res == resp->tr_logres);
 182		ASSERT(tp->t_log_count == 0 ||
 183		       tp->t_log_count == resp->tr_logcount);
 184
 185		if (resp->tr_logflags & XFS_TRANS_PERM_LOG_RES) {
 186			tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
 187			permanent = true;
 188		} else {
 189			ASSERT(tp->t_ticket == NULL);
 190			ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
 191		}
 192
 193		if (tp->t_ticket != NULL) {
 194			ASSERT(resp->tr_logflags & XFS_TRANS_PERM_LOG_RES);
 195			error = xfs_log_regrant(mp, tp->t_ticket);
 196		} else {
 197			error = xfs_log_reserve(mp, resp->tr_logres,
 
 198						resp->tr_logcount,
 199						&tp->t_ticket, permanent);
 
 200		}
 201
 202		if (error)
 203			goto undo_blocks;
 204
 205		tp->t_log_res = resp->tr_logres;
 206		tp->t_log_count = resp->tr_logcount;
 207	}
 208
 209	/*
 210	 * Attempt to reserve the needed realtime extents by decrementing
 211	 * the number needed from the number available.  This will
 212	 * fail if the count would go below zero.
 213	 */
 214	if (rtextents > 0) {
 215		error = xfs_dec_frextents(mp, rtextents);
 216		if (error) {
 217			error = -ENOSPC;
 218			goto undo_log;
 219		}
 220		tp->t_rtx_res += rtextents;
 221	}
 222
 223	return 0;
 224
 225	/*
 226	 * Error cases jump to one of these labels to undo any
 227	 * reservations which have already been performed.
 228	 */
 229undo_log:
 230	if (resp->tr_logres > 0) {
 231		xfs_log_ticket_ungrant(mp->m_log, tp->t_ticket);
 232		tp->t_ticket = NULL;
 233		tp->t_log_res = 0;
 234		tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
 235	}
 236
 237undo_blocks:
 238	if (blocks > 0) {
 239		xfs_add_fdblocks(mp, blocks);
 240		tp->t_blk_res = 0;
 241	}
 
 
 
 242	return error;
 243}
 244
 245int
 246xfs_trans_alloc(
 247	struct xfs_mount	*mp,
 248	struct xfs_trans_res	*resp,
 249	uint			blocks,
 250	uint			rtextents,
 251	uint			flags,
 252	struct xfs_trans	**tpp)
 253{
 254	struct xfs_trans	*tp;
 255	bool			want_retry = true;
 256	int			error;
 257
 258	/*
 259	 * Allocate the handle before we do our freeze accounting and setting up
 260	 * GFP_NOFS allocation context so that we avoid lockdep false positives
 261	 * by doing GFP_KERNEL allocations inside sb_start_intwrite().
 262	 */
 263retry:
 264	tp = kmem_cache_zalloc(xfs_trans_cache, GFP_KERNEL | __GFP_NOFAIL);
 265	if (!(flags & XFS_TRANS_NO_WRITECOUNT))
 266		sb_start_intwrite(mp->m_super);
 267	xfs_trans_set_context(tp);
 268
 269	/*
 270	 * Zero-reservation ("empty") transactions can't modify anything, so
 271	 * they're allowed to run while we're frozen.
 272	 */
 273	WARN_ON(resp->tr_logres > 0 &&
 274		mp->m_super->s_writers.frozen == SB_FREEZE_COMPLETE);
 275	ASSERT(!(flags & XFS_TRANS_RES_FDBLKS) ||
 276	       xfs_has_lazysbcount(mp));
 277
 
 
 278	tp->t_magic = XFS_TRANS_HEADER_MAGIC;
 279	tp->t_flags = flags;
 280	tp->t_mountp = mp;
 281	INIT_LIST_HEAD(&tp->t_items);
 282	INIT_LIST_HEAD(&tp->t_busy);
 283	INIT_LIST_HEAD(&tp->t_dfops);
 284	tp->t_highest_agno = NULLAGNUMBER;
 285
 286	error = xfs_trans_reserve(tp, resp, blocks, rtextents);
 287	if (error == -ENOSPC && want_retry) {
 288		xfs_trans_cancel(tp);
 289
 290		/*
 291		 * We weren't able to reserve enough space for the transaction.
 292		 * Flush the other speculative space allocations to free space.
 293		 * Do not perform a synchronous scan because callers can hold
 294		 * other locks.
 295		 */
 296		error = xfs_blockgc_flush_all(mp);
 297		if (error)
 298			return error;
 299		want_retry = false;
 300		goto retry;
 301	}
 302	if (error) {
 303		xfs_trans_cancel(tp);
 304		return error;
 305	}
 306
 307	trace_xfs_trans_alloc(tp, _RET_IP_);
 308
 309	*tpp = tp;
 310	return 0;
 311}
 312
 313/*
 314 * Create an empty transaction with no reservation.  This is a defensive
 315 * mechanism for routines that query metadata without actually modifying them --
 316 * if the metadata being queried is somehow cross-linked (think a btree block
 317 * pointer that points higher in the tree), we risk deadlock.  However, blocks
 318 * grabbed as part of a transaction can be re-grabbed.  The verifiers will
 319 * notice the corrupt block and the operation will fail back to userspace
 320 * without deadlocking.
 321 *
 322 * Note the zero-length reservation; this transaction MUST be cancelled without
 323 * any dirty data.
 324 *
 325 * Callers should obtain freeze protection to avoid a conflict with fs freezing
 326 * where we can be grabbing buffers at the same time that freeze is trying to
 327 * drain the buffer LRU list.
 328 */
 329int
 330xfs_trans_alloc_empty(
 331	struct xfs_mount		*mp,
 332	struct xfs_trans		**tpp)
 333{
 334	struct xfs_trans_res		resv = {0};
 335
 336	return xfs_trans_alloc(mp, &resv, 0, 0, XFS_TRANS_NO_WRITECOUNT, tpp);
 337}
 338
 339/*
 340 * Record the indicated change to the given field for application
 341 * to the file system's superblock when the transaction commits.
 342 * For now, just store the change in the transaction structure.
 343 *
 344 * Mark the transaction structure to indicate that the superblock
 345 * needs to be updated before committing.
 346 *
 347 * Because we may not be keeping track of allocated/free inodes and
 348 * used filesystem blocks in the superblock, we do not mark the
 349 * superblock dirty in this transaction if we modify these fields.
 350 * We still need to update the transaction deltas so that they get
 351 * applied to the incore superblock, but we don't want them to
 352 * cause the superblock to get locked and logged if these are the
 353 * only fields in the superblock that the transaction modifies.
 354 */
 355void
 356xfs_trans_mod_sb(
 357	xfs_trans_t	*tp,
 358	uint		field,
 359	int64_t		delta)
 360{
 361	uint32_t	flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
 362	xfs_mount_t	*mp = tp->t_mountp;
 363
 364	switch (field) {
 365	case XFS_TRANS_SB_ICOUNT:
 366		tp->t_icount_delta += delta;
 367		if (xfs_has_lazysbcount(mp))
 368			flags &= ~XFS_TRANS_SB_DIRTY;
 369		break;
 370	case XFS_TRANS_SB_IFREE:
 371		tp->t_ifree_delta += delta;
 372		if (xfs_has_lazysbcount(mp))
 373			flags &= ~XFS_TRANS_SB_DIRTY;
 374		break;
 375	case XFS_TRANS_SB_FDBLOCKS:
 376		/*
 377		 * Track the number of blocks allocated in the transaction.
 378		 * Make sure it does not exceed the number reserved. If so,
 379		 * shutdown as this can lead to accounting inconsistency.
 380		 */
 381		if (delta < 0) {
 382			tp->t_blk_res_used += (uint)-delta;
 383			if (tp->t_blk_res_used > tp->t_blk_res)
 384				xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 385		} else if (delta > 0 && (tp->t_flags & XFS_TRANS_RES_FDBLKS)) {
 386			int64_t	blkres_delta;
 387
 388			/*
 389			 * Return freed blocks directly to the reservation
 390			 * instead of the global pool, being careful not to
 391			 * overflow the trans counter. This is used to preserve
 392			 * reservation across chains of transaction rolls that
 393			 * repeatedly free and allocate blocks.
 394			 */
 395			blkres_delta = min_t(int64_t, delta,
 396					     UINT_MAX - tp->t_blk_res);
 397			tp->t_blk_res += blkres_delta;
 398			delta -= blkres_delta;
 399		}
 400		tp->t_fdblocks_delta += delta;
 401		if (xfs_has_lazysbcount(mp))
 402			flags &= ~XFS_TRANS_SB_DIRTY;
 403		break;
 404	case XFS_TRANS_SB_RES_FDBLOCKS:
 405		/*
 406		 * The allocation has already been applied to the
 407		 * in-core superblock's counter.  This should only
 408		 * be applied to the on-disk superblock.
 409		 */
 410		tp->t_res_fdblocks_delta += delta;
 411		if (xfs_has_lazysbcount(mp))
 412			flags &= ~XFS_TRANS_SB_DIRTY;
 413		break;
 414	case XFS_TRANS_SB_FREXTENTS:
 415		/*
 416		 * Track the number of blocks allocated in the
 417		 * transaction.  Make sure it does not exceed the
 418		 * number reserved.
 419		 */
 420		if (delta < 0) {
 421			tp->t_rtx_res_used += (uint)-delta;
 422			ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
 423		}
 424		tp->t_frextents_delta += delta;
 425		if (xfs_has_rtgroups(mp))
 426			flags &= ~XFS_TRANS_SB_DIRTY;
 427		break;
 428	case XFS_TRANS_SB_RES_FREXTENTS:
 429		/*
 430		 * The allocation has already been applied to the
 431		 * in-core superblock's counter.  This should only
 432		 * be applied to the on-disk superblock.
 433		 */
 434		ASSERT(delta < 0);
 435		tp->t_res_frextents_delta += delta;
 436		if (xfs_has_rtgroups(mp))
 437			flags &= ~XFS_TRANS_SB_DIRTY;
 438		break;
 439	case XFS_TRANS_SB_DBLOCKS:
 
 440		tp->t_dblocks_delta += delta;
 441		break;
 442	case XFS_TRANS_SB_AGCOUNT:
 443		ASSERT(delta > 0);
 444		tp->t_agcount_delta += delta;
 445		break;
 446	case XFS_TRANS_SB_IMAXPCT:
 447		tp->t_imaxpct_delta += delta;
 448		break;
 449	case XFS_TRANS_SB_REXTSIZE:
 450		tp->t_rextsize_delta += delta;
 451		break;
 452	case XFS_TRANS_SB_RBMBLOCKS:
 453		tp->t_rbmblocks_delta += delta;
 454		break;
 455	case XFS_TRANS_SB_RBLOCKS:
 456		tp->t_rblocks_delta += delta;
 457		break;
 458	case XFS_TRANS_SB_REXTENTS:
 459		tp->t_rextents_delta += delta;
 460		break;
 461	case XFS_TRANS_SB_REXTSLOG:
 462		tp->t_rextslog_delta += delta;
 463		break;
 464	case XFS_TRANS_SB_RGCOUNT:
 465		ASSERT(delta > 0);
 466		tp->t_rgcount_delta += delta;
 467		break;
 468	default:
 469		ASSERT(0);
 470		return;
 471	}
 472
 473	tp->t_flags |= flags;
 474}
 475
 476/*
 477 * xfs_trans_apply_sb_deltas() is called from the commit code
 478 * to bring the superblock buffer into the current transaction
 479 * and modify it as requested by earlier calls to xfs_trans_mod_sb().
 480 *
 481 * For now we just look at each field allowed to change and change
 482 * it if necessary.
 483 */
 484STATIC void
 485xfs_trans_apply_sb_deltas(
 486	xfs_trans_t	*tp)
 487{
 488	struct xfs_dsb	*sbp;
 489	struct xfs_buf	*bp;
 490	int		whole = 0;
 491
 492	bp = xfs_trans_getsb(tp);
 493	sbp = bp->b_addr;
 
 
 
 
 
 
 
 494
 495	/*
 496	 * Only update the superblock counters if we are logging them
 497	 */
 498	if (!xfs_has_lazysbcount((tp->t_mountp))) {
 499		if (tp->t_icount_delta)
 500			be64_add_cpu(&sbp->sb_icount, tp->t_icount_delta);
 501		if (tp->t_ifree_delta)
 502			be64_add_cpu(&sbp->sb_ifree, tp->t_ifree_delta);
 503		if (tp->t_fdblocks_delta)
 504			be64_add_cpu(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
 505		if (tp->t_res_fdblocks_delta)
 506			be64_add_cpu(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
 507	}
 508
 509	/*
 510	 * sb_frextents was added to the lazy sb counters when the rt groups
 511	 * feature was introduced.  This is possible because we know that all
 512	 * kernels supporting rtgroups will also recompute frextents from the
 513	 * realtime bitmap.
 514	 *
 515	 * For older file systems, updating frextents requires careful handling
 516	 * because we cannot rely on log recovery in older kernels to recompute
 517	 * the value from the rtbitmap.  This means that the ondisk frextents
 518	 * must be consistent with the rtbitmap.
 519	 *
 520	 * Therefore, log the frextents change to the ondisk superblock and
 521	 * update the incore superblock so that future calls to xfs_log_sb
 522	 * write the correct value ondisk.
 523	 */
 524	if ((tp->t_frextents_delta || tp->t_res_frextents_delta) &&
 525	    !xfs_has_rtgroups(tp->t_mountp)) {
 526		struct xfs_mount	*mp = tp->t_mountp;
 527		int64_t			rtxdelta;
 528
 529		rtxdelta = tp->t_frextents_delta + tp->t_res_frextents_delta;
 530
 531		spin_lock(&mp->m_sb_lock);
 532		be64_add_cpu(&sbp->sb_frextents, rtxdelta);
 533		mp->m_sb.sb_frextents += rtxdelta;
 534		spin_unlock(&mp->m_sb_lock);
 535	}
 536
 537	if (tp->t_dblocks_delta) {
 538		be64_add_cpu(&sbp->sb_dblocks, tp->t_dblocks_delta);
 539		whole = 1;
 540	}
 541	if (tp->t_agcount_delta) {
 542		be32_add_cpu(&sbp->sb_agcount, tp->t_agcount_delta);
 543		whole = 1;
 544	}
 545	if (tp->t_imaxpct_delta) {
 546		sbp->sb_imax_pct += tp->t_imaxpct_delta;
 547		whole = 1;
 548	}
 549	if (tp->t_rextsize_delta) {
 550		be32_add_cpu(&sbp->sb_rextsize, tp->t_rextsize_delta);
 551
 552		/*
 553		 * Because the ondisk sb records rtgroup size in units of rt
 554		 * extents, any time we update the rt extent size we have to
 555		 * recompute the ondisk rtgroup block log.  The incore values
 556		 * will be recomputed in xfs_trans_unreserve_and_mod_sb.
 557		 */
 558		if (xfs_has_rtgroups(tp->t_mountp)) {
 559			sbp->sb_rgblklog = xfs_compute_rgblklog(
 560						be32_to_cpu(sbp->sb_rgextents),
 561						be32_to_cpu(sbp->sb_rextsize));
 562		}
 563		whole = 1;
 564	}
 565	if (tp->t_rbmblocks_delta) {
 566		be32_add_cpu(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
 567		whole = 1;
 568	}
 569	if (tp->t_rblocks_delta) {
 570		be64_add_cpu(&sbp->sb_rblocks, tp->t_rblocks_delta);
 571		whole = 1;
 572	}
 573	if (tp->t_rextents_delta) {
 574		be64_add_cpu(&sbp->sb_rextents, tp->t_rextents_delta);
 575		whole = 1;
 576	}
 577	if (tp->t_rextslog_delta) {
 578		sbp->sb_rextslog += tp->t_rextslog_delta;
 579		whole = 1;
 580	}
 581	if (tp->t_rgcount_delta) {
 582		be32_add_cpu(&sbp->sb_rgcount, tp->t_rgcount_delta);
 583		whole = 1;
 584	}
 585
 586	xfs_trans_buf_set_type(tp, bp, XFS_BLFT_SB_BUF);
 587	if (whole)
 588		/*
 589		 * Log the whole thing, the fields are noncontiguous.
 590		 */
 591		xfs_trans_log_buf(tp, bp, 0, sizeof(struct xfs_dsb) - 1);
 592	else
 593		/*
 594		 * Since all the modifiable fields are contiguous, we
 595		 * can get away with this.
 596		 */
 597		xfs_trans_log_buf(tp, bp, offsetof(struct xfs_dsb, sb_icount),
 598				  offsetof(struct xfs_dsb, sb_frextents) +
 599				  sizeof(sbp->sb_frextents) - 1);
 600}
 601
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 602/*
 603 * xfs_trans_unreserve_and_mod_sb() is called to release unused reservations and
 604 * apply superblock counter changes to the in-core superblock.  The
 605 * t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
 606 * applied to the in-core superblock.  The idea is that that has already been
 607 * done.
 608 *
 609 * If we are not logging superblock counters, then the inode allocated/free and
 610 * used block counts are not updated in the on disk superblock. In this case,
 611 * XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
 612 * still need to update the incore superblock with the changes.
 613 *
 614 * Deltas for the inode count are +/-64, hence we use a large batch size of 128
 615 * so we don't need to take the counter lock on every update.
 616 */
 617#define XFS_ICOUNT_BATCH	128
 618
 619void
 620xfs_trans_unreserve_and_mod_sb(
 621	struct xfs_trans	*tp)
 622{
 623	struct xfs_mount	*mp = tp->t_mountp;
 624	int64_t			blkdelta = tp->t_blk_res;
 625	int64_t			rtxdelta = tp->t_rtx_res;
 
 626	int64_t			idelta = 0;
 627	int64_t			ifreedelta = 0;
 
 628
 629	/*
 630	 * Calculate the deltas.
 631	 *
 632	 * t_fdblocks_delta and t_frextents_delta can be positive or negative:
 633	 *
 634	 *  - positive values indicate blocks freed in the transaction.
 635	 *  - negative values indicate blocks allocated in the transaction
 636	 *
 637	 * Negative values can only happen if the transaction has a block
 638	 * reservation that covers the allocated block.  The end result is
 639	 * that the calculated delta values must always be positive and we
 640	 * can only put back previous allocated or reserved blocks here.
 641	 */
 642	ASSERT(tp->t_blk_res || tp->t_fdblocks_delta >= 0);
 643	if (xfs_has_lazysbcount(mp) || (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
 644	        blkdelta += tp->t_fdblocks_delta;
 645		ASSERT(blkdelta >= 0);
 646	}
 647
 648	ASSERT(tp->t_rtx_res || tp->t_frextents_delta >= 0);
 649	if (xfs_has_rtgroups(mp) || (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
 
 
 650		rtxdelta += tp->t_frextents_delta;
 651		ASSERT(rtxdelta >= 0);
 652	}
 653
 654	if (xfs_has_lazysbcount(mp) || (tp->t_flags & XFS_TRANS_SB_DIRTY)) {
 
 655		idelta = tp->t_icount_delta;
 656		ifreedelta = tp->t_ifree_delta;
 657	}
 658
 659	/* apply the per-cpu counters */
 660	if (blkdelta)
 661		xfs_add_fdblocks(mp, blkdelta);
 
 
 
 662
 663	if (idelta)
 664		percpu_counter_add_batch(&mp->m_icount, idelta,
 665					 XFS_ICOUNT_BATCH);
 
 
 666
 667	if (ifreedelta)
 668		percpu_counter_add(&mp->m_ifree, ifreedelta);
 
 
 
 669
 670	if (rtxdelta)
 671		xfs_add_frextents(mp, rtxdelta);
 672
 673	if (!(tp->t_flags & XFS_TRANS_SB_DIRTY))
 674		return;
 675
 676	/* apply remaining deltas */
 677	spin_lock(&mp->m_sb_lock);
 678	mp->m_sb.sb_fdblocks += tp->t_fdblocks_delta + tp->t_res_fdblocks_delta;
 679	mp->m_sb.sb_icount += idelta;
 680	mp->m_sb.sb_ifree += ifreedelta;
 681	/*
 682	 * Do not touch sb_frextents here because it is handled in
 683	 * xfs_trans_apply_sb_deltas for file systems where it isn't a lazy
 684	 * counter anyway.
 685	 */
 686	mp->m_sb.sb_dblocks += tp->t_dblocks_delta;
 687	mp->m_sb.sb_agcount += tp->t_agcount_delta;
 688	mp->m_sb.sb_imax_pct += tp->t_imaxpct_delta;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 689	if (tp->t_rextsize_delta)
 690		xfs_mount_sb_set_rextsize(mp, &mp->m_sb,
 691				mp->m_sb.sb_rextsize + tp->t_rextsize_delta);
 692	mp->m_sb.sb_rbmblocks += tp->t_rbmblocks_delta;
 693	mp->m_sb.sb_rblocks += tp->t_rblocks_delta;
 694	mp->m_sb.sb_rextents += tp->t_rextents_delta;
 695	mp->m_sb.sb_rextslog += tp->t_rextslog_delta;
 696	mp->m_sb.sb_rgcount += tp->t_rgcount_delta;
 
 
 
 
 697	spin_unlock(&mp->m_sb_lock);
 698
 699	/*
 700	 * Debug checks outside of the spinlock so they don't lock up the
 701	 * machine if they fail.
 702	 */
 703	ASSERT(mp->m_sb.sb_imax_pct >= 0);
 704	ASSERT(mp->m_sb.sb_rextslog >= 0);
 
 
 
 
 705}
 706
 707/* Add the given log item to the transaction's list of log items. */
 
 
 
 
 708void
 709xfs_trans_add_item(
 710	struct xfs_trans	*tp,
 711	struct xfs_log_item	*lip)
 712{
 713	ASSERT(lip->li_log == tp->t_mountp->m_log);
 
 
 714	ASSERT(lip->li_ailp == tp->t_mountp->m_ail);
 715	ASSERT(list_empty(&lip->li_trans));
 716	ASSERT(!test_bit(XFS_LI_DIRTY, &lip->li_flags));
 717
 718	list_add_tail(&lip->li_trans, &tp->t_items);
 719	trace_xfs_trans_add_item(tp, _RET_IP_);
 
 
 
 
 
 
 
 
 
 
 
 
 
 720}
 721
 722/*
 723 * Unlink the log item from the transaction. the log item is no longer
 724 * considered dirty in this transaction, as the linked transaction has
 725 * finished, either by abort or commit completion.
 726 */
 727void
 728xfs_trans_del_item(
 729	struct xfs_log_item	*lip)
 730{
 731	clear_bit(XFS_LI_DIRTY, &lip->li_flags);
 732	list_del_init(&lip->li_trans);
 733}
 734
 735/* Detach and unlock all of the items in a transaction */
 736static void
 
 
 
 737xfs_trans_free_items(
 738	struct xfs_trans	*tp,
 
 739	bool			abort)
 740{
 741	struct xfs_log_item	*lip, *next;
 742
 743	trace_xfs_trans_free_items(tp, _RET_IP_);
 
 744
 745	list_for_each_entry_safe(lip, next, &tp->t_items, li_trans) {
 746		xfs_trans_del_item(lip);
 
 
 747		if (abort)
 748			set_bit(XFS_LI_ABORTED, &lip->li_flags);
 749		if (lip->li_ops->iop_release)
 750			lip->li_ops->iop_release(lip);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 751	}
 752}
 753
 754/*
 755 * Sort transaction items prior to running precommit operations. This will
 756 * attempt to order the items such that they will always be locked in the same
 757 * order. Items that have no sort function are moved to the end of the list
 758 * and so are locked last.
 759 *
 760 * This may need refinement as different types of objects add sort functions.
 
 
 
 
 
 
 761 *
 762 * Function is more complex than it needs to be because we are comparing 64 bit
 763 * values and the function only returns 32 bit values.
 
 
 
 
 764 */
 765static int
 766xfs_trans_precommit_sort(
 767	void			*unused_arg,
 768	const struct list_head	*a,
 769	const struct list_head	*b)
 770{
 771	struct xfs_log_item	*lia = container_of(a,
 772					struct xfs_log_item, li_trans);
 773	struct xfs_log_item	*lib = container_of(b,
 774					struct xfs_log_item, li_trans);
 775	int64_t			diff;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 776
 777	/*
 778	 * If both items are non-sortable, leave them alone. If only one is
 779	 * sortable, move the non-sortable item towards the end of the list.
 780	 */
 781	if (!lia->li_ops->iop_sort && !lib->li_ops->iop_sort)
 782		return 0;
 783	if (!lia->li_ops->iop_sort)
 784		return 1;
 785	if (!lib->li_ops->iop_sort)
 786		return -1;
 787
 788	diff = lia->li_ops->iop_sort(lia) - lib->li_ops->iop_sort(lib);
 789	if (diff < 0)
 790		return -1;
 791	if (diff > 0)
 792		return 1;
 793	return 0;
 794}
 795
 796/*
 797 * Run transaction precommit functions.
 798 *
 799 * If there is an error in any of the callouts, then stop immediately and
 800 * trigger a shutdown to abort the transaction. There is no recovery possible
 801 * from errors at this point as the transaction is dirty....
 802 */
 803static int
 804xfs_trans_run_precommits(
 805	struct xfs_trans	*tp)
 806{
 807	struct xfs_mount	*mp = tp->t_mountp;
 808	struct xfs_log_item	*lip, *n;
 809	int			error = 0;
 810
 811	/*
 812	 * Sort the item list to avoid ABBA deadlocks with other transactions
 813	 * running precommit operations that lock multiple shared items such as
 814	 * inode cluster buffers.
 815	 */
 816	list_sort(NULL, &tp->t_items, xfs_trans_precommit_sort);
 817
 818	/*
 819	 * Precommit operations can remove the log item from the transaction
 820	 * if the log item exists purely to delay modifications until they
 821	 * can be ordered against other operations. Hence we have to use
 822	 * list_for_each_entry_safe() here.
 823	 */
 824	list_for_each_entry_safe(lip, n, &tp->t_items, li_trans) {
 825		if (!test_bit(XFS_LI_DIRTY, &lip->li_flags))
 
 
 
 
 
 826			continue;
 827		if (lip->li_ops->iop_precommit) {
 828			error = lip->li_ops->iop_precommit(tp, lip);
 829			if (error)
 830				break;
 
 
 
 
 831		}
 832	}
 833	if (error)
 834		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
 835	return error;
 
 
 
 
 
 836}
 837
 838/*
 839 * Commit the given transaction to the log.
 840 *
 841 * XFS disk error handling mechanism is not based on a typical
 842 * transaction abort mechanism. Logically after the filesystem
 843 * gets marked 'SHUTDOWN', we can't let any new transactions
 844 * be durable - ie. committed to disk - because some metadata might
 845 * be inconsistent. In such cases, this returns an error, and the
 846 * caller may assume that all locked objects joined to the transaction
 847 * have already been unlocked as if the commit had succeeded.
 848 * Do not reference the transaction structure after this call.
 849 */
 850static int
 851__xfs_trans_commit(
 852	struct xfs_trans	*tp,
 853	bool			regrant)
 854{
 855	struct xfs_mount	*mp = tp->t_mountp;
 856	struct xlog		*log = mp->m_log;
 857	xfs_csn_t		commit_seq = 0;
 858	int			error = 0;
 859	int			sync = tp->t_flags & XFS_TRANS_SYNC;
 860
 861	trace_xfs_trans_commit(tp, _RET_IP_);
 862
 863	/*
 864	 * Commit per-transaction changes that are not already tracked through
 865	 * log items.  This can add dirty log items to the transaction.
 866	 */
 867	if (tp->t_flags & XFS_TRANS_SB_DIRTY)
 868		xfs_trans_apply_sb_deltas(tp);
 869	xfs_trans_apply_dquot_deltas(tp);
 870
 871	error = xfs_trans_run_precommits(tp);
 872	if (error)
 873		goto out_unreserve;
 874
 875	/*
 876	 * If there is nothing to be logged by the transaction,
 877	 * then unlock all of the items associated with the
 878	 * transaction and free the transaction structure.
 879	 * Also make sure to return any reserved blocks to
 880	 * the free pool.
 881	 */
 882	if (!(tp->t_flags & XFS_TRANS_DIRTY))
 883		goto out_unreserve;
 884
 885	/*
 886	 * We must check against log shutdown here because we cannot abort log
 887	 * items and leave them dirty, inconsistent and unpinned in memory while
 888	 * the log is active. This leaves them open to being written back to
 889	 * disk, and that will lead to on-disk corruption.
 890	 */
 891	if (xlog_is_shutdown(log)) {
 892		error = -EIO;
 893		goto out_unreserve;
 894	}
 895
 896	ASSERT(tp->t_ticket != NULL);
 897
 898	xlog_cil_commit(log, tp, &commit_seq, regrant);
 
 
 
 
 
 
 
 899
 
 900	xfs_trans_free(tp);
 901
 902	/*
 903	 * If the transaction needs to be synchronous, then force the
 904	 * log out now and wait for it.
 905	 */
 906	if (sync) {
 907		error = xfs_log_force_seq(mp, commit_seq, XFS_LOG_SYNC, NULL);
 908		XFS_STATS_INC(mp, xs_trans_sync);
 909	} else {
 910		XFS_STATS_INC(mp, xs_trans_async);
 911	}
 912
 913	return error;
 914
 915out_unreserve:
 916	xfs_trans_unreserve_and_mod_sb(tp);
 917
 918	/*
 919	 * It is indeed possible for the transaction to be not dirty but
 920	 * the dqinfo portion to be.  All that means is that we have some
 921	 * (non-persistent) quota reservations that need to be unreserved.
 922	 */
 923	xfs_trans_unreserve_and_mod_dquots(tp, true);
 924	if (tp->t_ticket) {
 925		if (regrant && !xlog_is_shutdown(log))
 926			xfs_log_ticket_regrant(log, tp->t_ticket);
 927		else
 928			xfs_log_ticket_ungrant(log, tp->t_ticket);
 929		tp->t_ticket = NULL;
 930	}
 931	xfs_trans_free_items(tp, !!error);
 
 932	xfs_trans_free(tp);
 933
 934	XFS_STATS_INC(mp, xs_trans_empty);
 935	return error;
 936}
 937
 938int
 939xfs_trans_commit(
 940	struct xfs_trans	*tp)
 941{
 942	/*
 943	 * Finish deferred items on final commit. Only permanent transactions
 944	 * should ever have deferred ops.
 945	 */
 946	WARN_ON_ONCE(!list_empty(&tp->t_dfops) &&
 947		     !(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
 948	if (tp->t_flags & XFS_TRANS_PERM_LOG_RES) {
 949		int error = xfs_defer_finish_noroll(&tp);
 950		if (error) {
 951			xfs_trans_cancel(tp);
 952			return error;
 953		}
 954	}
 955
 956	return __xfs_trans_commit(tp, false);
 957}
 958
 959/*
 960 * Unlock all of the transaction's items and free the transaction.  If the
 961 * transaction is dirty, we must shut down the filesystem because there is no
 962 * way to restore them to their previous state.
 963 *
 964 * If the transaction has made a log reservation, make sure to release it as
 965 * well.
 966 *
 967 * This is a high level function (equivalent to xfs_trans_commit()) and so can
 968 * be called after the transaction has effectively been aborted due to the mount
 969 * being shut down. However, if the mount has not been shut down and the
 970 * transaction is dirty we will shut the mount down and, in doing so, that
 971 * guarantees that the log is shut down, too. Hence we don't need to be as
 972 * careful with shutdown state and dirty items here as we need to be in
 973 * xfs_trans_commit().
 974 */
 975void
 976xfs_trans_cancel(
 977	struct xfs_trans	*tp)
 978{
 979	struct xfs_mount	*mp = tp->t_mountp;
 980	struct xlog		*log = mp->m_log;
 981	bool			dirty = (tp->t_flags & XFS_TRANS_DIRTY);
 982
 983	trace_xfs_trans_cancel(tp, _RET_IP_);
 984
 985	/*
 986	 * It's never valid to cancel a transaction with deferred ops attached,
 987	 * because the transaction is effectively dirty.  Complain about this
 988	 * loudly before freeing the in-memory defer items and shutting down the
 989	 * filesystem.
 990	 */
 991	if (!list_empty(&tp->t_dfops)) {
 992		ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
 993		dirty = true;
 994		xfs_defer_cancel(tp);
 995	}
 996
 997	/*
 998	 * See if the caller is relying on us to shut down the filesystem. We
 999	 * only want an error report if there isn't already a shutdown in
1000	 * progress, so we only need to check against the mount shutdown state
1001	 * here.
1002	 */
1003	if (dirty && !xfs_is_shutdown(mp)) {
1004		XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
1005		xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
1006	}
1007#ifdef DEBUG
1008	/* Log items need to be consistent until the log is shut down. */
1009	if (!dirty && !xlog_is_shutdown(log)) {
1010		struct xfs_log_item *lip;
1011
1012		list_for_each_entry(lip, &tp->t_items, li_trans)
1013			ASSERT(!xlog_item_is_intent_done(lip));
1014	}
1015#endif
1016	xfs_trans_unreserve_and_mod_sb(tp);
1017	xfs_trans_unreserve_and_mod_dquots(tp, false);
 
 
 
1018
1019	if (tp->t_ticket) {
1020		xfs_log_ticket_ungrant(log, tp->t_ticket);
1021		tp->t_ticket = NULL;
1022	}
1023
1024	xfs_trans_free_items(tp, dirty);
1025	xfs_trans_free(tp);
1026}
1027
1028/*
1029 * Roll from one trans in the sequence of PERMANENT transactions to
1030 * the next: permanent transactions are only flushed out when
1031 * committed with xfs_trans_commit(), but we still want as soon
1032 * as possible to let chunks of it go to the log. So we commit the
1033 * chunk we've been working on and get a new transaction to continue.
1034 */
1035int
1036xfs_trans_roll(
1037	struct xfs_trans	**tpp)
1038{
1039	struct xfs_trans	*trans = *tpp;
1040	struct xfs_trans_res	tres;
1041	int			error;
1042
1043	trace_xfs_trans_roll(trans, _RET_IP_);
1044
1045	/*
1046	 * Copy the critical parameters from one trans to the next.
1047	 */
1048	tres.tr_logres = trans->t_log_res;
1049	tres.tr_logcount = trans->t_log_count;
1050
1051	*tpp = xfs_trans_dup(trans);
1052
1053	/*
1054	 * Commit the current transaction.
1055	 * If this commit failed, then it'd just unlock those items that
1056	 * are not marked ihold. That also means that a filesystem shutdown
1057	 * is in progress. The caller takes the responsibility to cancel
1058	 * the duplicate transaction that gets returned.
1059	 */
1060	error = __xfs_trans_commit(trans, true);
1061	if (error)
1062		return error;
1063
1064	/*
1065	 * Reserve space in the log for the next transaction.
1066	 * This also pushes items in the "AIL", the list of logged items,
1067	 * out to disk if they are taking up space at the tail of the log
1068	 * that we want to use.  This requires that either nothing be locked
1069	 * across this call, or that anything that is locked be logged in
1070	 * the prior and the next transactions.
1071	 */
1072	tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
1073	return xfs_trans_reserve(*tpp, &tres, 0, 0);
1074}
1075
1076/*
1077 * Allocate an transaction, lock and join the inode to it, and reserve quota.
1078 *
1079 * The caller must ensure that the on-disk dquots attached to this inode have
1080 * already been allocated and initialized.  The caller is responsible for
1081 * releasing ILOCK_EXCL if a new transaction is returned.
1082 */
1083int
1084xfs_trans_alloc_inode(
1085	struct xfs_inode	*ip,
1086	struct xfs_trans_res	*resv,
1087	unsigned int		dblocks,
1088	unsigned int		rblocks,
1089	bool			force,
1090	struct xfs_trans	**tpp)
1091{
1092	struct xfs_trans	*tp;
1093	struct xfs_mount	*mp = ip->i_mount;
1094	bool			retried = false;
1095	int			error;
1096
1097retry:
1098	error = xfs_trans_alloc(mp, resv, dblocks,
1099			xfs_extlen_to_rtxlen(mp, rblocks),
1100			force ? XFS_TRANS_RESERVE : 0, &tp);
1101	if (error)
1102		return error;
1103
1104	xfs_ilock(ip, XFS_ILOCK_EXCL);
1105	xfs_trans_ijoin(tp, ip, 0);
1106
1107	error = xfs_qm_dqattach_locked(ip, false);
1108	if (error) {
1109		/* Caller should have allocated the dquots! */
1110		ASSERT(error != -ENOENT);
1111		goto out_cancel;
1112	}
1113
1114	error = xfs_trans_reserve_quota_nblks(tp, ip, dblocks, rblocks, force);
1115	if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1116		xfs_trans_cancel(tp);
1117		xfs_iunlock(ip, XFS_ILOCK_EXCL);
1118		xfs_blockgc_free_quota(ip, 0);
1119		retried = true;
1120		goto retry;
1121	}
1122	if (error)
1123		goto out_cancel;
1124
1125	*tpp = tp;
1126	return 0;
1127
1128out_cancel:
1129	xfs_trans_cancel(tp);
1130	xfs_iunlock(ip, XFS_ILOCK_EXCL);
1131	return error;
1132}
1133
1134/*
1135 * Try to reserve more blocks for a transaction.
1136 *
1137 * This is for callers that need to attach resources to a transaction, scan
1138 * those resources to determine the space reservation requirements, and then
1139 * modify the attached resources.  In other words, online repair.  This can
1140 * fail due to ENOSPC, so the caller must be able to cancel the transaction
1141 * without shutting down the fs.
1142 */
1143int
1144xfs_trans_reserve_more(
1145	struct xfs_trans	*tp,
1146	unsigned int		blocks,
1147	unsigned int		rtextents)
1148{
1149	struct xfs_trans_res	resv = { };
1150
1151	return xfs_trans_reserve(tp, &resv, blocks, rtextents);
1152}
1153
1154/*
1155 * Try to reserve more blocks and file quota for a transaction.  Same
1156 * conditions of usage as xfs_trans_reserve_more.
1157 */
1158int
1159xfs_trans_reserve_more_inode(
1160	struct xfs_trans	*tp,
1161	struct xfs_inode	*ip,
1162	unsigned int		dblocks,
1163	unsigned int		rblocks,
1164	bool			force_quota)
1165{
1166	struct xfs_trans_res	resv = { };
1167	struct xfs_mount	*mp = ip->i_mount;
1168	unsigned int		rtx = xfs_extlen_to_rtxlen(mp, rblocks);
1169	int			error;
1170
1171	xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
1172
1173	error = xfs_trans_reserve(tp, &resv, dblocks, rtx);
1174	if (error)
1175		return error;
1176
1177	if (!XFS_IS_QUOTA_ON(mp) || xfs_is_quota_inode(&mp->m_sb, ip->i_ino))
1178		return 0;
1179
1180	if (tp->t_flags & XFS_TRANS_RESERVE)
1181		force_quota = true;
1182
1183	error = xfs_trans_reserve_quota_nblks(tp, ip, dblocks, rblocks,
1184			force_quota);
1185	if (!error)
1186		return 0;
1187
1188	/* Quota failed, give back the new reservation. */
1189	xfs_add_fdblocks(mp, dblocks);
1190	tp->t_blk_res -= dblocks;
1191	xfs_add_frextents(mp, rtx);
1192	tp->t_rtx_res -= rtx;
1193	return error;
1194}
1195
1196/*
1197 * Allocate an transaction in preparation for inode creation by reserving quota
1198 * against the given dquots.  Callers are not required to hold any inode locks.
1199 */
1200int
1201xfs_trans_alloc_icreate(
1202	struct xfs_mount	*mp,
1203	struct xfs_trans_res	*resv,
1204	struct xfs_dquot	*udqp,
1205	struct xfs_dquot	*gdqp,
1206	struct xfs_dquot	*pdqp,
1207	unsigned int		dblocks,
1208	struct xfs_trans	**tpp)
1209{
1210	struct xfs_trans	*tp;
1211	bool			retried = false;
1212	int			error;
1213
1214retry:
1215	error = xfs_trans_alloc(mp, resv, dblocks, 0, 0, &tp);
1216	if (error)
1217		return error;
1218
1219	error = xfs_trans_reserve_quota_icreate(tp, udqp, gdqp, pdqp, dblocks);
1220	if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1221		xfs_trans_cancel(tp);
1222		xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1223		retried = true;
1224		goto retry;
1225	}
1226	if (error) {
1227		xfs_trans_cancel(tp);
1228		return error;
1229	}
1230
1231	*tpp = tp;
1232	return 0;
1233}
1234
1235/*
1236 * Allocate an transaction, lock and join the inode to it, and reserve quota
1237 * in preparation for inode attribute changes that include uid, gid, or prid
1238 * changes.
1239 *
1240 * The caller must ensure that the on-disk dquots attached to this inode have
1241 * already been allocated and initialized.  The ILOCK will be dropped when the
1242 * transaction is committed or cancelled.
1243 */
1244int
1245xfs_trans_alloc_ichange(
1246	struct xfs_inode	*ip,
1247	struct xfs_dquot	*new_udqp,
1248	struct xfs_dquot	*new_gdqp,
1249	struct xfs_dquot	*new_pdqp,
1250	bool			force,
1251	struct xfs_trans	**tpp)
1252{
1253	struct xfs_trans	*tp;
1254	struct xfs_mount	*mp = ip->i_mount;
1255	struct xfs_dquot	*udqp;
1256	struct xfs_dquot	*gdqp;
1257	struct xfs_dquot	*pdqp;
1258	bool			retried = false;
1259	int			error;
1260
1261retry:
1262	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_ichange, 0, 0, 0, &tp);
1263	if (error)
1264		return error;
1265
1266	xfs_ilock(ip, XFS_ILOCK_EXCL);
1267	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
1268
1269	error = xfs_qm_dqattach_locked(ip, false);
1270	if (error) {
1271		/* Caller should have allocated the dquots! */
1272		ASSERT(error != -ENOENT);
1273		goto out_cancel;
1274	}
1275
1276	/*
1277	 * For each quota type, skip quota reservations if the inode's dquots
1278	 * now match the ones that came from the caller, or the caller didn't
1279	 * pass one in.  The inode's dquots can change if we drop the ILOCK to
1280	 * perform a blockgc scan, so we must preserve the caller's arguments.
1281	 */
1282	udqp = (new_udqp != ip->i_udquot) ? new_udqp : NULL;
1283	gdqp = (new_gdqp != ip->i_gdquot) ? new_gdqp : NULL;
1284	pdqp = (new_pdqp != ip->i_pdquot) ? new_pdqp : NULL;
1285	if (udqp || gdqp || pdqp) {
1286		xfs_filblks_t	dblocks, rblocks;
1287		unsigned int	qflags = XFS_QMOPT_RES_REGBLKS;
1288		bool		isrt = XFS_IS_REALTIME_INODE(ip);
1289
1290		if (force)
1291			qflags |= XFS_QMOPT_FORCE_RES;
1292
1293		if (isrt) {
1294			error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1295			if (error)
1296				goto out_cancel;
1297		}
1298
1299		xfs_inode_count_blocks(tp, ip, &dblocks, &rblocks);
1300
1301		if (isrt)
1302			rblocks += ip->i_delayed_blks;
1303		else
1304			dblocks += ip->i_delayed_blks;
1305
1306		/*
1307		 * Reserve enough quota to handle blocks on disk and reserved
1308		 * for a delayed allocation.  We'll actually transfer the
1309		 * delalloc reservation between dquots at chown time, even
1310		 * though that part is only semi-transactional.
1311		 */
1312		error = xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp,
1313				pdqp, dblocks, 1, qflags);
1314		if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1315			xfs_trans_cancel(tp);
1316			xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1317			retried = true;
1318			goto retry;
1319		}
1320		if (error)
1321			goto out_cancel;
1322
1323		/* Do the same for realtime. */
1324		qflags = XFS_QMOPT_RES_RTBLKS | (qflags & XFS_QMOPT_FORCE_RES);
1325		error = xfs_trans_reserve_quota_bydquots(tp, mp, udqp, gdqp,
1326				pdqp, rblocks, 0, qflags);
1327		if ((error == -EDQUOT || error == -ENOSPC) && !retried) {
1328			xfs_trans_cancel(tp);
1329			xfs_blockgc_free_dquots(mp, udqp, gdqp, pdqp, 0);
1330			retried = true;
1331			goto retry;
1332		}
1333		if (error)
1334			goto out_cancel;
1335	}
1336
1337	*tpp = tp;
1338	return 0;
1339
1340out_cancel:
1341	xfs_trans_cancel(tp);
1342	return error;
1343}
1344
1345/*
1346 * Allocate an transaction, lock and join the directory and child inodes to it,
1347 * and reserve quota for a directory update.  If there isn't sufficient space,
1348 * @dblocks will be set to zero for a reservationless directory update and
1349 * @nospace_error will be set to a negative errno describing the space
1350 * constraint we hit.
1351 *
1352 * The caller must ensure that the on-disk dquots attached to this inode have
1353 * already been allocated and initialized.  The ILOCKs will be dropped when the
1354 * transaction is committed or cancelled.
1355 *
1356 * Caller is responsible for unlocking the inodes manually upon return
1357 */
1358int
1359xfs_trans_alloc_dir(
1360	struct xfs_inode	*dp,
1361	struct xfs_trans_res	*resv,
1362	struct xfs_inode	*ip,
1363	unsigned int		*dblocks,
1364	struct xfs_trans	**tpp,
1365	int			*nospace_error)
1366{
1367	struct xfs_trans	*tp;
1368	struct xfs_mount	*mp = ip->i_mount;
1369	unsigned int		resblks;
1370	bool			retried = false;
1371	int			error;
1372
1373retry:
1374	*nospace_error = 0;
1375	resblks = *dblocks;
1376	error = xfs_trans_alloc(mp, resv, resblks, 0, 0, &tp);
1377	if (error == -ENOSPC) {
1378		*nospace_error = error;
1379		resblks = 0;
1380		error = xfs_trans_alloc(mp, resv, resblks, 0, 0, &tp);
1381	}
1382	if (error)
1383		return error;
1384
1385	xfs_lock_two_inodes(dp, XFS_ILOCK_EXCL, ip, XFS_ILOCK_EXCL);
1386
1387	xfs_trans_ijoin(tp, dp, 0);
1388	xfs_trans_ijoin(tp, ip, 0);
1389
1390	error = xfs_qm_dqattach_locked(dp, false);
1391	if (error) {
1392		/* Caller should have allocated the dquots! */
1393		ASSERT(error != -ENOENT);
1394		goto out_cancel;
1395	}
1396
1397	error = xfs_qm_dqattach_locked(ip, false);
1398	if (error) {
1399		/* Caller should have allocated the dquots! */
1400		ASSERT(error != -ENOENT);
1401		goto out_cancel;
1402	}
1403
1404	if (resblks == 0)
1405		goto done;
1406
1407	error = xfs_trans_reserve_quota_nblks(tp, dp, resblks, 0, false);
1408	if (error == -EDQUOT || error == -ENOSPC) {
1409		if (!retried) {
1410			xfs_trans_cancel(tp);
1411			xfs_iunlock(dp, XFS_ILOCK_EXCL);
1412			if (dp != ip)
1413				xfs_iunlock(ip, XFS_ILOCK_EXCL);
1414			xfs_blockgc_free_quota(dp, 0);
1415			retried = true;
1416			goto retry;
1417		}
1418
1419		*nospace_error = error;
1420		resblks = 0;
1421		error = 0;
1422	}
1423	if (error)
1424		goto out_cancel;
1425
1426done:
1427	*tpp = tp;
1428	*dblocks = resblks;
1429	return 0;
1430
1431out_cancel:
1432	xfs_trans_cancel(tp);
1433	xfs_iunlock(dp, XFS_ILOCK_EXCL);
1434	if (dp != ip)
1435		xfs_iunlock(ip, XFS_ILOCK_EXCL);
1436	return error;
1437}