[linux-2.6-block.git] / fs / xfs / xfs_refcount_item.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_shared.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_buf_item.h"
#include "xfs_refcount_item.h"
#include "xfs_log.h"
#include "xfs_refcount.h"


kmem_zone_t	*xfs_cui_zone;
kmem_zone_t	*xfs_cud_zone;

static inline struct xfs_cui_log_item *CUI_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_cui_log_item, cui_item);
}

void
xfs_cui_item_free(
	struct xfs_cui_log_item	*cuip)
{
	if (cuip->cui_format.cui_nextents > XFS_CUI_MAX_FAST_EXTENTS)
		kmem_free(cuip);
	else
		kmem_zone_free(xfs_cui_zone, cuip);
}

/*
 * Freeing the CUI requires that we remove it from the AIL if it has already
 * been placed there. However, the CUI may not yet have been placed in the AIL
 * when called by xfs_cui_release() from CUD processing due to the ordering of
 * committed vs unpin operations in bulk insert operations. Hence the reference
 * count to ensure only the last caller frees the CUI.
 */
void
xfs_cui_release(
	struct xfs_cui_log_item	*cuip)
{
	ASSERT(atomic_read(&cuip->cui_refcount) > 0);
	if (atomic_dec_and_test(&cuip->cui_refcount)) {
		xfs_trans_ail_remove(&cuip->cui_item, SHUTDOWN_LOG_IO_ERROR);
		xfs_cui_item_free(cuip);
	}
}


STATIC void
xfs_cui_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_cui_log_item	*cuip = CUI_ITEM(lip);

	*nvecs += 1;
	*nbytes += xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given cui log item. We use only 1 iovec, and we point that
 * at the cui_log_format structure embedded in the cui item.
 * It is at this point that we assert that all of the extent
 * slots in the cui item have been filled.
 */
STATIC void
xfs_cui_item_format(
	struct xfs_log_item	*lip,
	struct xfs_log_vec	*lv)
{
	struct xfs_cui_log_item	*cuip = CUI_ITEM(lip);
	struct xfs_log_iovec	*vecp = NULL;

	ASSERT(atomic_read(&cuip->cui_next_extent) ==
			cuip->cui_format.cui_nextents);

	cuip->cui_format.cui_type = XFS_LI_CUI;
	cuip->cui_format.cui_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUI_FORMAT, &cuip->cui_format,
			xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents));
}

/*
 * Pinning has no meaning for an cui item, so just return.
 */
STATIC void
xfs_cui_item_pin(
	struct xfs_log_item	*lip)
{
}

/*
 * The unpin operation is the last place an CUI is manipulated in the log. It is
 * either inserted in the AIL or aborted in the event of a log I/O error. In
 * either case, the CUI transaction has been successfully committed to make it
 * this far. Therefore, we expect whoever committed the CUI to either construct
 * and commit the CUD or drop the CUD's reference in the event of error. Simply
 * drop the log's CUI reference now that the log is done with it.
 */
STATIC void
xfs_cui_item_unpin(
	struct xfs_log_item	*lip,
	int			remove)
{
	struct xfs_cui_log_item	*cuip = CUI_ITEM(lip);

	xfs_cui_release(cuip);
}

/*
 * CUI items have no locking or pushing.  However, since CUIs are pulled from
 * the AIL when their corresponding CUDs are committed to disk, their situation
 * is very similar to being pinned.  Return XFS_ITEM_PINNED so that the caller
 * will eventually flush the log.  This should help in getting the CUI out of
 * the AIL.
 */
STATIC uint
xfs_cui_item_push(
	struct xfs_log_item	*lip,
	struct list_head	*buffer_list)
{
	return XFS_ITEM_PINNED;
}

/*
 * The CUI has been either committed or aborted if the transaction has been
 * cancelled. If the transaction was cancelled, an CUD isn't going to be
 * constructed and thus we free the CUI here directly.
 */
STATIC void
xfs_cui_item_unlock(
	struct xfs_log_item	*lip)
{
	if (test_bit(XFS_LI_ABORTED, &lip->li_flags))
		xfs_cui_release(CUI_ITEM(lip));
}

/*
 * The CUI is logged only once and cannot be moved in the log, so simply return
 * the lsn at which it's been logged.
 */
STATIC xfs_lsn_t
xfs_cui_item_committed(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
	return lsn;
}

/*
 * The CUI dependency tracking op doesn't do squat.  It can't because
 * it doesn't know where the free extent is coming from.  The dependency
 * tracking has to be handled by the "enclosing" metadata object.  For
 * example, for inodes, the inode is locked throughout the extent freeing
 * so the dependency should be recorded there.
 */
STATIC void
xfs_cui_item_committing(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
}

/*
 * This is the ops vector shared by all cui log items.
 */
static const struct xfs_item_ops xfs_cui_item_ops = {
	.iop_size	= xfs_cui_item_size,
	.iop_format	= xfs_cui_item_format,
	.iop_pin	= xfs_cui_item_pin,
	.iop_unpin	= xfs_cui_item_unpin,
	.iop_unlock	= xfs_cui_item_unlock,
	.iop_committed	= xfs_cui_item_committed,
	.iop_push	= xfs_cui_item_push,
	.iop_committing = xfs_cui_item_committing,
};

/*
 * Allocate and initialize an cui item with the given number of extents.
 */
struct xfs_cui_log_item *
xfs_cui_init(
	struct xfs_mount		*mp,
	uint				nextents)

{
	struct xfs_cui_log_item		*cuip;

	ASSERT(nextents > 0);
	if (nextents > XFS_CUI_MAX_FAST_EXTENTS)
		cuip = kmem_zalloc(xfs_cui_log_item_sizeof(nextents),
				KM_SLEEP);
	else
		cuip = kmem_zone_zalloc(xfs_cui_zone, KM_SLEEP);

	xfs_log_item_init(mp, &cuip->cui_item, XFS_LI_CUI, &xfs_cui_item_ops);
	cuip->cui_format.cui_nextents = nextents;
	cuip->cui_format.cui_id = (uintptr_t)(void *)cuip;
	atomic_set(&cuip->cui_next_extent, 0);
	atomic_set(&cuip->cui_refcount, 2);

	return cuip;
}

static inline struct xfs_cud_log_item *CUD_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_cud_log_item, cud_item);
}

STATIC void
xfs_cud_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{
	*nvecs += 1;
	*nbytes += sizeof(struct xfs_cud_log_format);
}

/*
 * This is called to fill in the vector of log iovecs for the
 * given cud log item. We use only 1 iovec, and we point that
 * at the cud_log_format structure embedded in the cud item.
 * It is at this point that we assert that all of the extent
 * slots in the cud item have been filled.
 */
STATIC void
xfs_cud_item_format(
	struct xfs_log_item	*lip,
	struct xfs_log_vec	*lv)
{
	struct xfs_cud_log_item	*cudp = CUD_ITEM(lip);
	struct xfs_log_iovec	*vecp = NULL;

	cudp->cud_format.cud_type = XFS_LI_CUD;
	cudp->cud_format.cud_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUD_FORMAT, &cudp->cud_format,
			sizeof(struct xfs_cud_log_format));
}

/*
 * Pinning has no meaning for an cud item, so just return.
 */
STATIC void
xfs_cud_item_pin(
	struct xfs_log_item	*lip)
{
}

/*
 * Since pinning has no meaning for an cud item, unpinning does
 * not either.
 */
STATIC void
xfs_cud_item_unpin(
	struct xfs_log_item	*lip,
	int			remove)
{
}

/*
 * There isn't much you can do to push on an cud item.  It is simply stuck
 * waiting for the log to be flushed to disk.
 */
STATIC uint
xfs_cud_item_push(
	struct xfs_log_item	*lip,
	struct list_head	*buffer_list)
{
	return XFS_ITEM_PINNED;
}

/*
 * The CUD is either committed or aborted if the transaction is cancelled. If
 * the transaction is cancelled, drop our reference to the CUI and free the
 * CUD.
 */
STATIC void
xfs_cud_item_unlock(
	struct xfs_log_item	*lip)
{
	struct xfs_cud_log_item	*cudp = CUD_ITEM(lip);

	if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
		xfs_cui_release(cudp->cud_cuip);
		kmem_zone_free(xfs_cud_zone, cudp);
	}
}

/*
 * When the cud item is committed to disk, all we need to do is delete our
 * reference to our partner cui item and then free ourselves. Since we're
 * freeing ourselves we must return -1 to keep the transaction code from
 * further referencing this item.
 */
STATIC xfs_lsn_t
xfs_cud_item_committed(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
	struct xfs_cud_log_item	*cudp = CUD_ITEM(lip);

	/*
	 * Drop the CUI reference regardless of whether the CUD has been
	 * aborted. Once the CUD transaction is constructed, it is the sole
	 * responsibility of the CUD to release the CUI (even if the CUI is
	 * aborted due to log I/O error).
	 */
	xfs_cui_release(cudp->cud_cuip);
	kmem_zone_free(xfs_cud_zone, cudp);

	return (xfs_lsn_t)-1;
}

/*
 * The CUD dependency tracking op doesn't do squat.  It can't because
 * it doesn't know where the free extent is coming from.  The dependency
 * tracking has to be handled by the "enclosing" metadata object.  For
 * example, for inodes, the inode is locked throughout the extent freeing
 * so the dependency should be recorded there.
 */
STATIC void
xfs_cud_item_committing(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
}

/*
 * This is the ops vector shared by all cud log items.
 */
static const struct xfs_item_ops xfs_cud_item_ops = {
	.iop_size	= xfs_cud_item_size,
	.iop_format	= xfs_cud_item_format,
	.iop_pin	= xfs_cud_item_pin,
	.iop_unpin	= xfs_cud_item_unpin,
	.iop_unlock	= xfs_cud_item_unlock,
	.iop_committed	= xfs_cud_item_committed,
	.iop_push	= xfs_cud_item_push,
	.iop_committing = xfs_cud_item_committing,
};

/*
 * Allocate and initialize an cud item with the given number of extents.
 */
struct xfs_cud_log_item *
xfs_cud_init(
	struct xfs_mount		*mp,
	struct xfs_cui_log_item		*cuip)

{
	struct xfs_cud_log_item	*cudp;

	cudp = kmem_zone_zalloc(xfs_cud_zone, KM_SLEEP);
	xfs_log_item_init(mp, &cudp->cud_item, XFS_LI_CUD, &xfs_cud_item_ops);
	cudp->cud_cuip = cuip;
	cudp->cud_format.cud_cui_id = cuip->cui_format.cui_id;

	return cudp;
}

/*
 * Process a refcount update intent item that was recovered from the log.
 * We need to update the refcountbt.
 */
int
xfs_cui_recover(
	struct xfs_trans		*parent_tp,
	struct xfs_cui_log_item		*cuip)
{
	int				i;
	int				error = 0;
	unsigned int			refc_type;
	struct xfs_phys_extent		*refc;
	xfs_fsblock_t			startblock_fsb;
	bool				op_ok;
	struct xfs_cud_log_item		*cudp;
	struct xfs_trans		*tp;
	struct xfs_btree_cur		*rcur = NULL;
	enum xfs_refcount_intent_type	type;
	xfs_fsblock_t			new_fsb;
	xfs_extlen_t			new_len;
	struct xfs_bmbt_irec		irec;
	bool				requeue_only = false;
	struct xfs_mount		*mp = parent_tp->t_mountp;

	ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags));

	/*
	 * First check the validity of the extents described by the
	 * CUI.  If any are bad, then assume that all are bad and
	 * just toss the CUI.
	 */
	for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
		refc = &cuip->cui_format.cui_extents[i];
		startblock_fsb = XFS_BB_TO_FSB(mp,
				   XFS_FSB_TO_DADDR(mp, refc->pe_startblock));
		switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) {
		case XFS_REFCOUNT_INCREASE:
		case XFS_REFCOUNT_DECREASE:
		case XFS_REFCOUNT_ALLOC_COW:
		case XFS_REFCOUNT_FREE_COW:
			op_ok = true;
			break;
		default:
			op_ok = false;
			break;
		}
		if (!op_ok || startblock_fsb == 0 ||
		    refc->pe_len == 0 ||
		    startblock_fsb >= mp->m_sb.sb_dblocks ||
		    refc->pe_len >= mp->m_sb.sb_agblocks ||
		    (refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)) {
			/*
			 * This will pull the CUI from the AIL and
			 * free the memory associated with it.
			 */
			set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
			xfs_cui_release(cuip);
			return -EIO;
		}
	}

	/*
	 * Under normal operation, refcount updates are deferred, so we
	 * wouldn't be adding them directly to a transaction.  All
	 * refcount updates manage reservation usage internally and
	 * dynamically by deferring work that won't fit in the
	 * transaction.  Normally, any work that needs to be deferred
	 * gets attached to the same defer_ops that scheduled the
	 * refcount update.  However, we're in log recovery here, so we
	 * we use the passed in defer_ops and to finish up any work that
	 * doesn't fit.  We need to reserve enough blocks to handle a
	 * full btree split on either end of the refcount range.
	 */
	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
			mp->m_refc_maxlevels * 2, 0, XFS_TRANS_RESERVE, &tp);
	if (error)
		return error;
	/*
	 * Recovery stashes all deferred ops during intent processing and
	 * finishes them on completion. Transfer current dfops state to this
	 * transaction and transfer the result back before we return.
	 */
	xfs_defer_move(tp, parent_tp);
	cudp = xfs_trans_get_cud(tp, cuip);

	for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
		refc = &cuip->cui_format.cui_extents[i];
		refc_type = refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK;
		switch (refc_type) {
		case XFS_REFCOUNT_INCREASE:
		case XFS_REFCOUNT_DECREASE:
		case XFS_REFCOUNT_ALLOC_COW:
		case XFS_REFCOUNT_FREE_COW:
			type = refc_type;
			break;
		default:
			error = -EFSCORRUPTED;
			goto abort_error;
		}
		if (requeue_only) {
			new_fsb = refc->pe_startblock;
			new_len = refc->pe_len;
		} else
			error = xfs_trans_log_finish_refcount_update(tp, cudp,
				type, refc->pe_startblock, refc->pe_len,
				&new_fsb, &new_len, &rcur);
		if (error)
			goto abort_error;

		/* Requeue what we didn't finish. */
		if (new_len > 0) {
			irec.br_startblock = new_fsb;
			irec.br_blockcount = new_len;
			switch (type) {
			case XFS_REFCOUNT_INCREASE:
				error = xfs_refcount_increase_extent(tp, &irec);
				break;
			case XFS_REFCOUNT_DECREASE:
				error = xfs_refcount_decrease_extent(tp, &irec);
				break;
			case XFS_REFCOUNT_ALLOC_COW:
				error = xfs_refcount_alloc_cow_extent(tp,
						irec.br_startblock,
						irec.br_blockcount);
				break;
			case XFS_REFCOUNT_FREE_COW:
				error = xfs_refcount_free_cow_extent(tp,
						irec.br_startblock,
						irec.br_blockcount);
				break;
			default:
				ASSERT(0);
			}
			if (error)
				goto abort_error;
			requeue_only = true;
		}
	}

	xfs_refcount_finish_one_cleanup(tp, rcur, error);
	set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
	xfs_defer_move(parent_tp, tp);
	error = xfs_trans_commit(tp);
	return error;

abort_error:
	xfs_refcount_finish_one_cleanup(tp, rcur, error);
	xfs_defer_move(parent_tp, tp);
	xfs_trans_cancel(tp);
	return error;
}
Commit	Line	Data
0b61f8a4	1	// SPDX-License-Identifier: GPL-2.0+
baf4bcac DW	2	/*
baf4bcac DW	3	* Copyright (C) 2016 Oracle. All Rights Reserved.
baf4bcac	4	* Author: Darrick J. Wong <darrick.wong@oracle.com>
baf4bcac DW	5	*/
	6	#include "xfs.h"
	7	#include "xfs_fs.h"
	8	#include "xfs_format.h"
	9	#include "xfs_log_format.h"
	10	#include "xfs_trans_resv.h"
f997ee21	11	#include "xfs_bit.h"
b31c2bdc	12	#include "xfs_shared.h"
baf4bcac	13	#include "xfs_mount.h"
f997ee21	14	#include "xfs_defer.h"
baf4bcac DW	15	#include "xfs_trans.h"
	16	#include "xfs_trans_priv.h"
	17	#include "xfs_buf_item.h"
	18	#include "xfs_refcount_item.h"
	19	#include "xfs_log.h"
f997ee21	20	#include "xfs_refcount.h"
baf4bcac DW	21
	22
	23	kmem_zone_t *xfs_cui_zone;
	24	kmem_zone_t *xfs_cud_zone;
	25
	26	static inline struct xfs_cui_log_item CUI_ITEM(struct xfs_log_item lip)
	27	{
	28	return container_of(lip, struct xfs_cui_log_item, cui_item);
	29	}
	30
	31	void
	32	xfs_cui_item_free(
	33	struct xfs_cui_log_item *cuip)
	34	{
	35	if (cuip->cui_format.cui_nextents > XFS_CUI_MAX_FAST_EXTENTS)
	36	kmem_free(cuip);
	37	else
	38	kmem_zone_free(xfs_cui_zone, cuip);
	39	}
	40
0612d116 DC	41	/*
	42	* Freeing the CUI requires that we remove it from the AIL if it has already
	43	* been placed there. However, the CUI may not yet have been placed in the AIL
	44	* when called by xfs_cui_release() from CUD processing due to the ordering of
	45	* committed vs unpin operations in bulk insert operations. Hence the reference
	46	* count to ensure only the last caller frees the CUI.
	47	*/
	48	void
	49	xfs_cui_release(
	50	struct xfs_cui_log_item *cuip)
	51	{
	52	ASSERT(atomic_read(&cuip->cui_refcount) > 0);
	53	if (atomic_dec_and_test(&cuip->cui_refcount)) {
	54	xfs_trans_ail_remove(&cuip->cui_item, SHUTDOWN_LOG_IO_ERROR);
	55	xfs_cui_item_free(cuip);
	56	}
	57	}
	58
	59
baf4bcac DW	60	STATIC void
	61	xfs_cui_item_size(
	62	struct xfs_log_item *lip,
	63	int *nvecs,
	64	int *nbytes)
	65	{
	66	struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
	67
	68	*nvecs += 1;
	69	*nbytes += xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents);
	70	}
	71
	72	/*
	73	* This is called to fill in the vector of log iovecs for the
	74	* given cui log item. We use only 1 iovec, and we point that
	75	* at the cui_log_format structure embedded in the cui item.
	76	* It is at this point that we assert that all of the extent
	77	* slots in the cui item have been filled.
	78	*/
	79	STATIC void
	80	xfs_cui_item_format(
	81	struct xfs_log_item *lip,
	82	struct xfs_log_vec *lv)
	83	{
	84	struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
	85	struct xfs_log_iovec *vecp = NULL;
	86
	87	ASSERT(atomic_read(&cuip->cui_next_extent) ==
	88	cuip->cui_format.cui_nextents);
	89
	90	cuip->cui_format.cui_type = XFS_LI_CUI;
	91	cuip->cui_format.cui_size = 1;
	92
	93	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUI_FORMAT, &cuip->cui_format,
	94	xfs_cui_log_format_sizeof(cuip->cui_format.cui_nextents));
	95	}
	96
	97	/*
	98	* Pinning has no meaning for an cui item, so just return.
	99	*/
	100	STATIC void
	101	xfs_cui_item_pin(
	102	struct xfs_log_item *lip)
	103	{
	104	}
	105
	106	/*
	107	* The unpin operation is the last place an CUI is manipulated in the log. It is
	108	* either inserted in the AIL or aborted in the event of a log I/O error. In
	109	* either case, the CUI transaction has been successfully committed to make it
	110	* this far. Therefore, we expect whoever committed the CUI to either construct
	111	* and commit the CUD or drop the CUD's reference in the event of error. Simply
	112	* drop the log's CUI reference now that the log is done with it.
	113	*/
	114	STATIC void
	115	xfs_cui_item_unpin(
	116	struct xfs_log_item *lip,
	117	int remove)
	118	{
	119	struct xfs_cui_log_item *cuip = CUI_ITEM(lip);
	120
	121	xfs_cui_release(cuip);
	122	}
	123
124	/*
125	* CUI items have no locking or pushing. However, since CUIs are pulled from
126	* the AIL when their corresponding CUDs are committed to disk, their situation
127	* is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
128	* will eventually flush the log. This should help in getting the CUI out of
129	* the AIL.
130	*/
131	STATIC uint
132	xfs_cui_item_push(
133	struct xfs_log_item *lip,
134	struct list_head *buffer_list)
135	{
136	return XFS_ITEM_PINNED;
137	}
138
139	/*
140	* The CUI has been either committed or aborted if the transaction has been
141	* cancelled. If the transaction was cancelled, an CUD isn't going to be
142	* constructed and thus we free the CUI here directly.
143	*/
144	STATIC void
145	xfs_cui_item_unlock(
146	struct xfs_log_item *lip)
147	{
22525c17	148	if (test_bit(XFS_LI_ABORTED, &lip->li_flags))
0612d116	149	xfs_cui_release(CUI_ITEM(lip));
baf4bcac DW	150	}
	151
	152	/*
	153	* The CUI is logged only once and cannot be moved in the log, so simply return
	154	* the lsn at which it's been logged.
	155	*/
	156	STATIC xfs_lsn_t
	157	xfs_cui_item_committed(
	158	struct xfs_log_item *lip,
	159	xfs_lsn_t lsn)
	160	{
	161	return lsn;
	162	}
	163
	164	/*
	165	* The CUI dependency tracking op doesn't do squat. It can't because
	166	* it doesn't know where the free extent is coming from. The dependency
	167	* tracking has to be handled by the "enclosing" metadata object. For
	168	* example, for inodes, the inode is locked throughout the extent freeing
	169	* so the dependency should be recorded there.
	170	*/
	171	STATIC void
	172	xfs_cui_item_committing(
	173	struct xfs_log_item *lip,
	174	xfs_lsn_t lsn)
	175	{
	176	}
	177
	178	/*
	179	* This is the ops vector shared by all cui log items.
	180	*/
	181	static const struct xfs_item_ops xfs_cui_item_ops = {
	182	.iop_size = xfs_cui_item_size,
	183	.iop_format = xfs_cui_item_format,
	184	.iop_pin = xfs_cui_item_pin,
	185	.iop_unpin = xfs_cui_item_unpin,
	186	.iop_unlock = xfs_cui_item_unlock,
	187	.iop_committed = xfs_cui_item_committed,
	188	.iop_push = xfs_cui_item_push,
	189	.iop_committing = xfs_cui_item_committing,
	190	};
	191
	192	/*
	193	* Allocate and initialize an cui item with the given number of extents.
	194	*/
	195	struct xfs_cui_log_item *
	196	xfs_cui_init(
	197	struct xfs_mount *mp,
	198	uint nextents)
	199
	200	{
	201	struct xfs_cui_log_item *cuip;
	202
	203	ASSERT(nextents > 0);
	204	if (nextents > XFS_CUI_MAX_FAST_EXTENTS)
	205	cuip = kmem_zalloc(xfs_cui_log_item_sizeof(nextents),
	206	KM_SLEEP);
	207	else
	208	cuip = kmem_zone_zalloc(xfs_cui_zone, KM_SLEEP);
	209
	210	xfs_log_item_init(mp, &cuip->cui_item, XFS_LI_CUI, &xfs_cui_item_ops);
	211	cuip->cui_format.cui_nextents = nextents;
	212	cuip->cui_format.cui_id = (uintptr_t)(void *)cuip;
	213	atomic_set(&cuip->cui_next_extent, 0);
214	atomic_set(&cuip->cui_refcount, 2);
215
216	return cuip;
217	}
218
baf4bcac DW	219	static inline struct xfs_cud_log_item CUD_ITEM(struct xfs_log_item lip)
	220	{
	221	return container_of(lip, struct xfs_cud_log_item, cud_item);
	222	}
	223
	224	STATIC void
	225	xfs_cud_item_size(
	226	struct xfs_log_item *lip,
	227	int *nvecs,
	228	int *nbytes)
	229	{
	230	*nvecs += 1;
	231	*nbytes += sizeof(struct xfs_cud_log_format);
	232	}
	233
	234	/*
	235	* This is called to fill in the vector of log iovecs for the
	236	* given cud log item. We use only 1 iovec, and we point that
	237	* at the cud_log_format structure embedded in the cud item.
	238	* It is at this point that we assert that all of the extent
	239	* slots in the cud item have been filled.
	240	*/
	241	STATIC void
	242	xfs_cud_item_format(
	243	struct xfs_log_item *lip,
	244	struct xfs_log_vec *lv)
	245	{
	246	struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
	247	struct xfs_log_iovec *vecp = NULL;
	248
	249	cudp->cud_format.cud_type = XFS_LI_CUD;
	250	cudp->cud_format.cud_size = 1;
	251
	252	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_CUD_FORMAT, &cudp->cud_format,
	253	sizeof(struct xfs_cud_log_format));
	254	}
	255
	256	/*
	257	* Pinning has no meaning for an cud item, so just return.
	258	*/
	259	STATIC void
	260	xfs_cud_item_pin(
	261	struct xfs_log_item *lip)
	262	{
	263	}
	264
	265	/*
	266	* Since pinning has no meaning for an cud item, unpinning does
	267	* not either.
	268	*/
	269	STATIC void
	270	xfs_cud_item_unpin(
	271	struct xfs_log_item *lip,
	272	int remove)
	273	{
	274	}
	275
	276	/*
	277	* There isn't much you can do to push on an cud item. It is simply stuck
	278	* waiting for the log to be flushed to disk.
	279	*/
	280	STATIC uint
	281	xfs_cud_item_push(
	282	struct xfs_log_item *lip,
283	struct list_head *buffer_list)
284	{
285	return XFS_ITEM_PINNED;
286	}
287
288	/*
289	* The CUD is either committed or aborted if the transaction is cancelled. If
290	* the transaction is cancelled, drop our reference to the CUI and free the
291	* CUD.
292	*/
293	STATIC void
294	xfs_cud_item_unlock(
295	struct xfs_log_item *lip)
296	{
297	struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
298
22525c17	299	if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
baf4bcac DW	300	xfs_cui_release(cudp->cud_cuip);
	301	kmem_zone_free(xfs_cud_zone, cudp);
	302	}
	303	}
	304
	305	/*
	306	* When the cud item is committed to disk, all we need to do is delete our
	307	* reference to our partner cui item and then free ourselves. Since we're
	308	* freeing ourselves we must return -1 to keep the transaction code from
	309	* further referencing this item.
	310	*/
	311	STATIC xfs_lsn_t
	312	xfs_cud_item_committed(
	313	struct xfs_log_item *lip,
	314	xfs_lsn_t lsn)
	315	{
	316	struct xfs_cud_log_item *cudp = CUD_ITEM(lip);
	317
	318	/*
	319	* Drop the CUI reference regardless of whether the CUD has been
	320	* aborted. Once the CUD transaction is constructed, it is the sole
	321	* responsibility of the CUD to release the CUI (even if the CUI is
	322	* aborted due to log I/O error).
	323	*/
	324	xfs_cui_release(cudp->cud_cuip);
	325	kmem_zone_free(xfs_cud_zone, cudp);
	326
	327	return (xfs_lsn_t)-1;
	328	}
	329
	330	/*
	331	* The CUD dependency tracking op doesn't do squat. It can't because
	332	* it doesn't know where the free extent is coming from. The dependency
	333	* tracking has to be handled by the "enclosing" metadata object. For
	334	* example, for inodes, the inode is locked throughout the extent freeing
	335	* so the dependency should be recorded there.
	336	*/
	337	STATIC void
	338	xfs_cud_item_committing(
	339	struct xfs_log_item *lip,
	340	xfs_lsn_t lsn)
	341	{
	342	}
	343
	344	/*
	345	* This is the ops vector shared by all cud log items.
	346	*/
	347	static const struct xfs_item_ops xfs_cud_item_ops = {
	348	.iop_size = xfs_cud_item_size,
	349	.iop_format = xfs_cud_item_format,
	350	.iop_pin = xfs_cud_item_pin,
	351	.iop_unpin = xfs_cud_item_unpin,
	352	.iop_unlock = xfs_cud_item_unlock,
	353	.iop_committed = xfs_cud_item_committed,
	354	.iop_push = xfs_cud_item_push,
	355	.iop_committing = xfs_cud_item_committing,
	356	};
	357
	358	/*
	359	* Allocate and initialize an cud item with the given number of extents.
	360	*/
	361	struct xfs_cud_log_item *
	362	xfs_cud_init(
	363	struct xfs_mount *mp,
364	struct xfs_cui_log_item *cuip)
365
366	{
367	struct xfs_cud_log_item *cudp;
368
369	cudp = kmem_zone_zalloc(xfs_cud_zone, KM_SLEEP);
370	xfs_log_item_init(mp, &cudp->cud_item, XFS_LI_CUD, &xfs_cud_item_ops);
371	cudp->cud_cuip = cuip;
372	cudp->cud_format.cud_cui_id = cuip->cui_format.cui_id;
373
374	return cudp;
375	}
f997ee21 DW	376
	377	/*
	378	* Process a refcount update intent item that was recovered from the log.
	379	* We need to update the refcountbt.
	380	*/
	381	int
	382	xfs_cui_recover(
fbfa977d BF	383	struct xfs_trans *parent_tp,
fbfa977d BF	384	struct xfs_cui_log_item *cuip)
f997ee21 DW	385	{
	386	int i;
	387	int error = 0;
33ba6129	388	unsigned int refc_type;
f997ee21 DW	389	struct xfs_phys_extent *refc;
	390	xfs_fsblock_t startblock_fsb;
	391	bool op_ok;
33ba6129 DW	392	struct xfs_cud_log_item *cudp;
	393	struct xfs_trans *tp;
	394	struct xfs_btree_cur *rcur = NULL;
	395	enum xfs_refcount_intent_type type;
33ba6129 DW	396	xfs_fsblock_t new_fsb;
	397	xfs_extlen_t new_len;
	398	struct xfs_bmbt_irec irec;
33ba6129	399	bool requeue_only = false;
fbfa977d	400	struct xfs_mount *mp = parent_tp->t_mountp;
f997ee21 DW	401
	402	ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags));
	403
	404	/*
	405	* First check the validity of the extents described by the
	406	* CUI. If any are bad, then assume that all are bad and
	407	* just toss the CUI.
	408	*/
	409	for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
	410	refc = &cuip->cui_format.cui_extents[i];
	411	startblock_fsb = XFS_BB_TO_FSB(mp,
	412	XFS_FSB_TO_DADDR(mp, refc->pe_startblock));
	413	switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) {
	414	case XFS_REFCOUNT_INCREASE:
	415	case XFS_REFCOUNT_DECREASE:
	416	case XFS_REFCOUNT_ALLOC_COW:
	417	case XFS_REFCOUNT_FREE_COW:
	418	op_ok = true;
	419	break;
	420	default:
	421	op_ok = false;
	422	break;
	423	}
	424	if (!op_ok \|\| startblock_fsb == 0 \|\|
	425	refc->pe_len == 0 \|\|
	426	startblock_fsb >= mp->m_sb.sb_dblocks \|\|
	427	refc->pe_len >= mp->m_sb.sb_agblocks \|\|
	428	(refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)) {
	429	/*
	430	* This will pull the CUI from the AIL and
	431	* free the memory associated with it.
	432	*/
	433	set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
	434	xfs_cui_release(cuip);
	435	return -EIO;
	436	}
	437	}
	438
33ba6129 DW	439	/*
	440	* Under normal operation, refcount updates are deferred, so we
	441	* wouldn't be adding them directly to a transaction. All
	442	* refcount updates manage reservation usage internally and
	443	* dynamically by deferring work that won't fit in the
	444	* transaction. Normally, any work that needs to be deferred
	445	* gets attached to the same defer_ops that scheduled the
	446	* refcount update. However, we're in log recovery here, so we
b31c2bdc DW	447	* we use the passed in defer_ops and to finish up any work that
	448	* doesn't fit. We need to reserve enough blocks to handle a
	449	* full btree split on either end of the refcount range.
33ba6129	450	*/
b31c2bdc DW	451	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
b31c2bdc DW	452	mp->m_refc_maxlevels * 2, 0, XFS_TRANS_RESERVE, &tp);
33ba6129 DW	453	if (error)
33ba6129 DW	454	return error;
91ef75b6 BF	455	/*
	456	* Recovery stashes all deferred ops during intent processing and
	457	* finishes them on completion. Transfer current dfops state to this
	458	* transaction and transfer the result back before we return.
	459	*/
ce356d64	460	xfs_defer_move(tp, parent_tp);
33ba6129 DW	461	cudp = xfs_trans_get_cud(tp, cuip);
33ba6129 DW	462
33ba6129 DW	463	for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
	464	refc = &cuip->cui_format.cui_extents[i];
	465	refc_type = refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK;
	466	switch (refc_type) {
	467	case XFS_REFCOUNT_INCREASE:
	468	case XFS_REFCOUNT_DECREASE:
	469	case XFS_REFCOUNT_ALLOC_COW:
	470	case XFS_REFCOUNT_FREE_COW:
	471	type = refc_type;
	472	break;
	473	default:
	474	error = -EFSCORRUPTED;
	475	goto abort_error;
	476	}
	477	if (requeue_only) {
	478	new_fsb = refc->pe_startblock;
	479	new_len = refc->pe_len;
	480	} else
	481	error = xfs_trans_log_finish_refcount_update(tp, cudp,
7dbddbac BF	482	type, refc->pe_startblock, refc->pe_len,
7dbddbac BF	483	&new_fsb, &new_len, &rcur);
33ba6129 DW	484	if (error)
	485	goto abort_error;
	486
	487	/* Requeue what we didn't finish. */
	488	if (new_len > 0) {
	489	irec.br_startblock = new_fsb;
	490	irec.br_blockcount = new_len;
	491	switch (type) {
	492	case XFS_REFCOUNT_INCREASE:
0f37d178	493	error = xfs_refcount_increase_extent(tp, &irec);
33ba6129 DW	494	break;
33ba6129 DW	495	case XFS_REFCOUNT_DECREASE:
0f37d178	496	error = xfs_refcount_decrease_extent(tp, &irec);
33ba6129	497	break;
174edb0e	498	case XFS_REFCOUNT_ALLOC_COW:
0f37d178	499	error = xfs_refcount_alloc_cow_extent(tp,
174edb0e DW	500	irec.br_startblock,
	501	irec.br_blockcount);
	502	break;
	503	case XFS_REFCOUNT_FREE_COW:
0f37d178	504	error = xfs_refcount_free_cow_extent(tp,
174edb0e DW	505	irec.br_startblock,
	506	irec.br_blockcount);
	507	break;
33ba6129 DW	508	default:
	509	ASSERT(0);
	510	}
	511	if (error)
	512	goto abort_error;
	513	requeue_only = true;
	514	}
	515	}
	516
	517	xfs_refcount_finish_one_cleanup(tp, rcur, error);
f997ee21	518	set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
ce356d64	519	xfs_defer_move(parent_tp, tp);
33ba6129 DW	520	error = xfs_trans_commit(tp);
	521	return error;
	522
	523	abort_error:
	524	xfs_refcount_finish_one_cleanup(tp, rcur, error);
ce356d64	525	xfs_defer_move(parent_tp, tp);
33ba6129	526	xfs_trans_cancel(tp);
f997ee21 DW	527	return error;
f997ee21 DW	528	}