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

/*
 * Copyright (C) 2016 Oracle.  All Rights Reserved.
 *
 * Author: Darrick J. Wong <darrick.wong@oracle.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
 */
#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_mount.h"
#include "xfs_defer.h"
#include "xfs_inode.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_buf_item.h"
#include "xfs_bmap_item.h"
#include "xfs_log.h"
#include "xfs_bmap.h"
#include "xfs_icache.h"
#include "xfs_trace.h"
#include "xfs_bmap_btree.h"
#include "xfs_trans_space.h"


kmem_zone_t	*xfs_bui_zone;
kmem_zone_t	*xfs_bud_zone;

static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_bui_log_item, bui_item);
}

void
xfs_bui_item_free(
	struct xfs_bui_log_item	*buip)
{
	kmem_zone_free(xfs_bui_zone, buip);
}

/*
 * Freeing the BUI requires that we remove it from the AIL if it has already
 * been placed there. However, the BUI may not yet have been placed in the AIL
 * when called by xfs_bui_release() from BUD 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 BUI.
 */
void
xfs_bui_release(
	struct xfs_bui_log_item	*buip)
{
	ASSERT(atomic_read(&buip->bui_refcount) > 0);
	if (atomic_dec_and_test(&buip->bui_refcount)) {
		xfs_trans_ail_remove(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR);
		xfs_bui_item_free(buip);
	}
}


STATIC void
xfs_bui_item_size(
	struct xfs_log_item	*lip,
	int			*nvecs,
	int			*nbytes)
{
	struct xfs_bui_log_item	*buip = BUI_ITEM(lip);

	*nvecs += 1;
	*nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents);
}

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

	ASSERT(atomic_read(&buip->bui_next_extent) ==
			buip->bui_format.bui_nextents);

	buip->bui_format.bui_type = XFS_LI_BUI;
	buip->bui_format.bui_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format,
			xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents));
}

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

/*
 * The unpin operation is the last place an BUI 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 BUI transaction has been successfully committed to make it
 * this far. Therefore, we expect whoever committed the BUI to either construct
 * and commit the BUD or drop the BUD's reference in the event of error. Simply
 * drop the log's BUI reference now that the log is done with it.
 */
STATIC void
xfs_bui_item_unpin(
	struct xfs_log_item	*lip,
	int			remove)
{
	struct xfs_bui_log_item	*buip = BUI_ITEM(lip);

	xfs_bui_release(buip);
}

/*
 * BUI items have no locking or pushing.  However, since BUIs are pulled from
 * the AIL when their corresponding BUDs 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 BUI out of
 * the AIL.
 */
STATIC uint
xfs_bui_item_push(
	struct xfs_log_item	*lip,
	struct list_head	*buffer_list)
{
	return XFS_ITEM_PINNED;
}

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

/*
 * The BUI 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_bui_item_committed(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
	return lsn;
}

/*
 * The BUI 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_bui_item_committing(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
}

/*
 * This is the ops vector shared by all bui log items.
 */
static const struct xfs_item_ops xfs_bui_item_ops = {
	.iop_size	= xfs_bui_item_size,
	.iop_format	= xfs_bui_item_format,
	.iop_pin	= xfs_bui_item_pin,
	.iop_unpin	= xfs_bui_item_unpin,
	.iop_unlock	= xfs_bui_item_unlock,
	.iop_committed	= xfs_bui_item_committed,
	.iop_push	= xfs_bui_item_push,
	.iop_committing = xfs_bui_item_committing,
};

/*
 * Allocate and initialize an bui item with the given number of extents.
 */
struct xfs_bui_log_item *
xfs_bui_init(
	struct xfs_mount		*mp)

{
	struct xfs_bui_log_item		*buip;

	buip = kmem_zone_zalloc(xfs_bui_zone, KM_SLEEP);

	xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops);
	buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS;
	buip->bui_format.bui_id = (uintptr_t)(void *)buip;
	atomic_set(&buip->bui_next_extent, 0);
	atomic_set(&buip->bui_refcount, 2);

	return buip;
}

static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip)
{
	return container_of(lip, struct xfs_bud_log_item, bud_item);
}

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

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

	budp->bud_format.bud_type = XFS_LI_BUD;
	budp->bud_format.bud_size = 1;

	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format,
			sizeof(struct xfs_bud_log_format));
}

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

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

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

/*
 * The BUD is either committed or aborted if the transaction is cancelled. If
 * the transaction is cancelled, drop our reference to the BUI and free the
 * BUD.
 */
STATIC void
xfs_bud_item_unlock(
	struct xfs_log_item	*lip)
{
	struct xfs_bud_log_item	*budp = BUD_ITEM(lip);

	if (lip->li_flags & XFS_LI_ABORTED) {
		xfs_bui_release(budp->bud_buip);
		kmem_zone_free(xfs_bud_zone, budp);
	}
}

/*
 * When the bud item is committed to disk, all we need to do is delete our
 * reference to our partner bui 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_bud_item_committed(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
	struct xfs_bud_log_item	*budp = BUD_ITEM(lip);

	/*
	 * Drop the BUI reference regardless of whether the BUD has been
	 * aborted. Once the BUD transaction is constructed, it is the sole
	 * responsibility of the BUD to release the BUI (even if the BUI is
	 * aborted due to log I/O error).
	 */
	xfs_bui_release(budp->bud_buip);
	kmem_zone_free(xfs_bud_zone, budp);

	return (xfs_lsn_t)-1;
}

/*
 * The BUD 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_bud_item_committing(
	struct xfs_log_item	*lip,
	xfs_lsn_t		lsn)
{
}

/*
 * This is the ops vector shared by all bud log items.
 */
static const struct xfs_item_ops xfs_bud_item_ops = {
	.iop_size	= xfs_bud_item_size,
	.iop_format	= xfs_bud_item_format,
	.iop_pin	= xfs_bud_item_pin,
	.iop_unpin	= xfs_bud_item_unpin,
	.iop_unlock	= xfs_bud_item_unlock,
	.iop_committed	= xfs_bud_item_committed,
	.iop_push	= xfs_bud_item_push,
	.iop_committing = xfs_bud_item_committing,
};

/*
 * Allocate and initialize an bud item with the given number of extents.
 */
struct xfs_bud_log_item *
xfs_bud_init(
	struct xfs_mount		*mp,
	struct xfs_bui_log_item		*buip)

{
	struct xfs_bud_log_item	*budp;

	budp = kmem_zone_zalloc(xfs_bud_zone, KM_SLEEP);
	xfs_log_item_init(mp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops);
	budp->bud_buip = buip;
	budp->bud_format.bud_bui_id = buip->bui_format.bui_id;

	return budp;
}

/*
 * Process a bmap update intent item that was recovered from the log.
 * We need to update some inode's bmbt.
 */
int
xfs_bui_recover(
	struct xfs_mount		*mp,
	struct xfs_bui_log_item		*buip,
	struct xfs_defer_ops		*dfops)
{
	int				error = 0;
	unsigned int			bui_type;
	struct xfs_map_extent		*bmap;
	xfs_fsblock_t			startblock_fsb;
	xfs_fsblock_t			inode_fsb;
	xfs_filblks_t			count;
	bool				op_ok;
	struct xfs_bud_log_item		*budp;
	enum xfs_bmap_intent_type	type;
	int				whichfork;
	xfs_exntst_t			state;
	struct xfs_trans		*tp;
	struct xfs_inode		*ip = NULL;
	struct xfs_bmbt_irec		irec;

	ASSERT(!test_bit(XFS_BUI_RECOVERED, &buip->bui_flags));

	/* Only one mapping operation per BUI... */
	if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
		set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
		xfs_bui_release(buip);
		return -EIO;
	}

	/*
	 * First check the validity of the extent described by the
	 * BUI.  If anything is bad, then toss the BUI.
	 */
	bmap = &buip->bui_format.bui_extents[0];
	startblock_fsb = XFS_BB_TO_FSB(mp,
			   XFS_FSB_TO_DADDR(mp, bmap->me_startblock));
	inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp,
			XFS_INO_TO_FSB(mp, bmap->me_owner)));
	switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) {
	case XFS_BMAP_MAP:
	case XFS_BMAP_UNMAP:
		op_ok = true;
		break;
	default:
		op_ok = false;
		break;
	}
	if (!op_ok || startblock_fsb == 0 ||
	    bmap->me_len == 0 ||
	    inode_fsb == 0 ||
	    startblock_fsb >= mp->m_sb.sb_dblocks ||
	    bmap->me_len >= mp->m_sb.sb_agblocks ||
	    inode_fsb >= mp->m_sb.sb_dblocks ||
	    (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)) {
		/*
		 * This will pull the BUI from the AIL and
		 * free the memory associated with it.
		 */
		set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
		xfs_bui_release(buip);
		return -EIO;
	}

	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
			XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
	if (error)
		return error;
	budp = xfs_trans_get_bud(tp, buip);

	/* Grab the inode. */
	error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip);
	if (error)
		goto err_inode;

	if (VFS_I(ip)->i_nlink == 0)
		xfs_iflags_set(ip, XFS_IRECOVERY);

	/* Process deferred bmap item. */
	state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ?
			XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
	whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ?
			XFS_ATTR_FORK : XFS_DATA_FORK;
	bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK;
	switch (bui_type) {
	case XFS_BMAP_MAP:
	case XFS_BMAP_UNMAP:
		type = bui_type;
		break;
	default:
		error = -EFSCORRUPTED;
		goto err_inode;
	}
	xfs_trans_ijoin(tp, ip, 0);

	count = bmap->me_len;
	error = xfs_trans_log_finish_bmap_update(tp, budp, dfops, type,
			ip, whichfork, bmap->me_startoff,
			bmap->me_startblock, &count, state);
	if (error)
		goto err_inode;

	if (count > 0) {
		ASSERT(type == XFS_BMAP_UNMAP);
		irec.br_startblock = bmap->me_startblock;
		irec.br_blockcount = count;
		irec.br_startoff = bmap->me_startoff;
		irec.br_state = state;
		error = xfs_bmap_unmap_extent(tp->t_mountp, dfops, ip, &irec);
		if (error)
			goto err_inode;
	}

	set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
	error = xfs_trans_commit(tp);
	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	IRELE(ip);

	return error;

err_inode:
	xfs_trans_cancel(tp);
	if (ip) {
		xfs_iunlock(ip, XFS_ILOCK_EXCL);
		IRELE(ip);
	}
	return error;
}
Commit	Line	Data
6413a014 DW	1	/*
	2	* Copyright (C) 2016 Oracle. All Rights Reserved.
	3	*
	4	* Author: Darrick J. Wong <darrick.wong@oracle.com>
	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
	8	* as published by the Free Software Foundation; either version 2
	9	* of the License, or (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it would be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write the Free Software Foundation,
	18	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
	19	*/
	20	#include "xfs.h"
	21	#include "xfs_fs.h"
	22	#include "xfs_format.h"
	23	#include "xfs_log_format.h"
	24	#include "xfs_trans_resv.h"
77d61fe4	25	#include "xfs_bit.h"
6413a014	26	#include "xfs_mount.h"
77d61fe4 DW	27	#include "xfs_defer.h"
77d61fe4 DW	28	#include "xfs_inode.h"
6413a014 DW	29	#include "xfs_trans.h"
	30	#include "xfs_trans_priv.h"
	31	#include "xfs_buf_item.h"
	32	#include "xfs_bmap_item.h"
	33	#include "xfs_log.h"
77d61fe4 DW	34	#include "xfs_bmap.h"
	35	#include "xfs_icache.h"
	36	#include "xfs_trace.h"
fe0be23e DW	37	#include "xfs_bmap_btree.h"
fe0be23e DW	38	#include "xfs_trans_space.h"
6413a014 DW	39
	40
	41	kmem_zone_t *xfs_bui_zone;
	42	kmem_zone_t *xfs_bud_zone;
	43
	44	static inline struct xfs_bui_log_item BUI_ITEM(struct xfs_log_item lip)
	45	{
	46	return container_of(lip, struct xfs_bui_log_item, bui_item);
	47	}
	48
	49	void
	50	xfs_bui_item_free(
	51	struct xfs_bui_log_item *buip)
	52	{
	53	kmem_zone_free(xfs_bui_zone, buip);
	54	}
	55
0612d116 DC	56	/*
	57	* Freeing the BUI requires that we remove it from the AIL if it has already
	58	* been placed there. However, the BUI may not yet have been placed in the AIL
	59	* when called by xfs_bui_release() from BUD processing due to the ordering of
	60	* committed vs unpin operations in bulk insert operations. Hence the reference
	61	* count to ensure only the last caller frees the BUI.
	62	*/
	63	void
	64	xfs_bui_release(
	65	struct xfs_bui_log_item *buip)
	66	{
	67	ASSERT(atomic_read(&buip->bui_refcount) > 0);
	68	if (atomic_dec_and_test(&buip->bui_refcount)) {
	69	xfs_trans_ail_remove(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR);
	70	xfs_bui_item_free(buip);
	71	}
	72	}
	73
	74
6413a014 DW	75	STATIC void
	76	xfs_bui_item_size(
	77	struct xfs_log_item *lip,
	78	int *nvecs,
	79	int *nbytes)
	80	{
	81	struct xfs_bui_log_item *buip = BUI_ITEM(lip);
	82
	83	*nvecs += 1;
	84	*nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents);
	85	}
	86
	87	/*
	88	* This is called to fill in the vector of log iovecs for the
	89	* given bui log item. We use only 1 iovec, and we point that
	90	* at the bui_log_format structure embedded in the bui item.
	91	* It is at this point that we assert that all of the extent
	92	* slots in the bui item have been filled.
	93	*/
	94	STATIC void
	95	xfs_bui_item_format(
	96	struct xfs_log_item *lip,
	97	struct xfs_log_vec *lv)
	98	{
	99	struct xfs_bui_log_item *buip = BUI_ITEM(lip);
	100	struct xfs_log_iovec *vecp = NULL;
	101
	102	ASSERT(atomic_read(&buip->bui_next_extent) ==
	103	buip->bui_format.bui_nextents);
	104
	105	buip->bui_format.bui_type = XFS_LI_BUI;
	106	buip->bui_format.bui_size = 1;
	107
	108	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format,
	109	xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents));
	110	}
	111
	112	/*
	113	* Pinning has no meaning for an bui item, so just return.
	114	*/
	115	STATIC void
	116	xfs_bui_item_pin(
	117	struct xfs_log_item *lip)
	118	{
	119	}
	120
	121	/*
	122	* The unpin operation is the last place an BUI is manipulated in the log. It is
	123	* either inserted in the AIL or aborted in the event of a log I/O error. In
	124	* either case, the BUI transaction has been successfully committed to make it
	125	* this far. Therefore, we expect whoever committed the BUI to either construct
	126	* and commit the BUD or drop the BUD's reference in the event of error. Simply
	127	* drop the log's BUI reference now that the log is done with it.
	128	*/
	129	STATIC void
	130	xfs_bui_item_unpin(
	131	struct xfs_log_item *lip,
	132	int remove)
	133	{
	134	struct xfs_bui_log_item *buip = BUI_ITEM(lip);
	135
	136	xfs_bui_release(buip);
	137	}
	138
139	/*
140	* BUI items have no locking or pushing. However, since BUIs are pulled from
141	* the AIL when their corresponding BUDs are committed to disk, their situation
142	* is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller
143	* will eventually flush the log. This should help in getting the BUI out of
144	* the AIL.
145	*/
146	STATIC uint
147	xfs_bui_item_push(
148	struct xfs_log_item *lip,
149	struct list_head *buffer_list)
150	{
151	return XFS_ITEM_PINNED;
152	}
153
154	/*
155	* The BUI has been either committed or aborted if the transaction has been
156	* cancelled. If the transaction was cancelled, an BUD isn't going to be
157	* constructed and thus we free the BUI here directly.
158	*/
159	STATIC void
160	xfs_bui_item_unlock(
161	struct xfs_log_item *lip)
162	{
163	if (lip->li_flags & XFS_LI_ABORTED)
0612d116	164	xfs_bui_release(BUI_ITEM(lip));
6413a014 DW	165	}
	166
	167	/*
	168	* The BUI is logged only once and cannot be moved in the log, so simply return
	169	* the lsn at which it's been logged.
	170	*/
	171	STATIC xfs_lsn_t
	172	xfs_bui_item_committed(
	173	struct xfs_log_item *lip,
	174	xfs_lsn_t lsn)
	175	{
	176	return lsn;
	177	}
	178
	179	/*
	180	* The BUI dependency tracking op doesn't do squat. It can't because
	181	* it doesn't know where the free extent is coming from. The dependency
	182	* tracking has to be handled by the "enclosing" metadata object. For
	183	* example, for inodes, the inode is locked throughout the extent freeing
	184	* so the dependency should be recorded there.
	185	*/
	186	STATIC void
	187	xfs_bui_item_committing(
	188	struct xfs_log_item *lip,
	189	xfs_lsn_t lsn)
	190	{
	191	}
	192
	193	/*
	194	* This is the ops vector shared by all bui log items.
	195	*/
	196	static const struct xfs_item_ops xfs_bui_item_ops = {
	197	.iop_size = xfs_bui_item_size,
	198	.iop_format = xfs_bui_item_format,
	199	.iop_pin = xfs_bui_item_pin,
	200	.iop_unpin = xfs_bui_item_unpin,
	201	.iop_unlock = xfs_bui_item_unlock,
	202	.iop_committed = xfs_bui_item_committed,
	203	.iop_push = xfs_bui_item_push,
	204	.iop_committing = xfs_bui_item_committing,
	205	};
	206
	207	/*
	208	* Allocate and initialize an bui item with the given number of extents.
	209	*/
	210	struct xfs_bui_log_item *
	211	xfs_bui_init(
	212	struct xfs_mount *mp)
	213
	214	{
	215	struct xfs_bui_log_item *buip;
	216
	217	buip = kmem_zone_zalloc(xfs_bui_zone, KM_SLEEP);
	218
	219	xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops);
	220	buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS;
	221	buip->bui_format.bui_id = (uintptr_t)(void *)buip;
	222	atomic_set(&buip->bui_next_extent, 0);
	223	atomic_set(&buip->bui_refcount, 2);
	224
	225	return buip;
	226	}
	227
6413a014 DW	228	static inline struct xfs_bud_log_item BUD_ITEM(struct xfs_log_item lip)
	229	{
	230	return container_of(lip, struct xfs_bud_log_item, bud_item);
	231	}
	232
	233	STATIC void
	234	xfs_bud_item_size(
	235	struct xfs_log_item *lip,
	236	int *nvecs,
	237	int *nbytes)
	238	{
	239	*nvecs += 1;
	240	*nbytes += sizeof(struct xfs_bud_log_format);
	241	}
	242
	243	/*
	244	* This is called to fill in the vector of log iovecs for the
	245	* given bud log item. We use only 1 iovec, and we point that
	246	* at the bud_log_format structure embedded in the bud item.
	247	* It is at this point that we assert that all of the extent
	248	* slots in the bud item have been filled.
	249	*/
	250	STATIC void
	251	xfs_bud_item_format(
	252	struct xfs_log_item *lip,
	253	struct xfs_log_vec *lv)
	254	{
	255	struct xfs_bud_log_item *budp = BUD_ITEM(lip);
	256	struct xfs_log_iovec *vecp = NULL;
	257
	258	budp->bud_format.bud_type = XFS_LI_BUD;
	259	budp->bud_format.bud_size = 1;
	260
	261	xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format,
	262	sizeof(struct xfs_bud_log_format));
	263	}
	264
	265	/*
	266	* Pinning has no meaning for an bud item, so just return.
	267	*/
	268	STATIC void
	269	xfs_bud_item_pin(
	270	struct xfs_log_item *lip)
	271	{
	272	}
	273
	274	/*
	275	* Since pinning has no meaning for an bud item, unpinning does
	276	* not either.
	277	*/
	278	STATIC void
	279	xfs_bud_item_unpin(
	280	struct xfs_log_item *lip,
	281	int remove)
	282	{
	283	}
	284
	285	/*
	286	* There isn't much you can do to push on an bud item. It is simply stuck
	287	* waiting for the log to be flushed to disk.
	288	*/
	289	STATIC uint
	290	xfs_bud_item_push(
	291	struct xfs_log_item *lip,
292	struct list_head *buffer_list)
293	{
294	return XFS_ITEM_PINNED;
295	}
296
297	/*
298	* The BUD is either committed or aborted if the transaction is cancelled. If
299	* the transaction is cancelled, drop our reference to the BUI and free the
300	* BUD.
301	*/
302	STATIC void
303	xfs_bud_item_unlock(
304	struct xfs_log_item *lip)
305	{
306	struct xfs_bud_log_item *budp = BUD_ITEM(lip);
307
308	if (lip->li_flags & XFS_LI_ABORTED) {
309	xfs_bui_release(budp->bud_buip);
310	kmem_zone_free(xfs_bud_zone, budp);
311	}
312	}
313
314	/*
315	* When the bud item is committed to disk, all we need to do is delete our
316	* reference to our partner bui item and then free ourselves. Since we're
317	* freeing ourselves we must return -1 to keep the transaction code from
318	* further referencing this item.
319	*/
320	STATIC xfs_lsn_t
321	xfs_bud_item_committed(
322	struct xfs_log_item *lip,
323	xfs_lsn_t lsn)
324	{
325	struct xfs_bud_log_item *budp = BUD_ITEM(lip);
326
327	/*
328	* Drop the BUI reference regardless of whether the BUD has been
329	* aborted. Once the BUD transaction is constructed, it is the sole
330	* responsibility of the BUD to release the BUI (even if the BUI is
331	* aborted due to log I/O error).
332	*/
333	xfs_bui_release(budp->bud_buip);
334	kmem_zone_free(xfs_bud_zone, budp);
335
336	return (xfs_lsn_t)-1;
337	}
338
339	/*
340	* The BUD dependency tracking op doesn't do squat. It can't because
341	* it doesn't know where the free extent is coming from. The dependency
342	* tracking has to be handled by the "enclosing" metadata object. For
343	* example, for inodes, the inode is locked throughout the extent freeing
344	* so the dependency should be recorded there.
345	*/
346	STATIC void
347	xfs_bud_item_committing(
348	struct xfs_log_item *lip,
349	xfs_lsn_t lsn)
350	{
351	}
352
353	/*
354	* This is the ops vector shared by all bud log items.
355	*/
356	static const struct xfs_item_ops xfs_bud_item_ops = {
357	.iop_size = xfs_bud_item_size,
358	.iop_format = xfs_bud_item_format,
359	.iop_pin = xfs_bud_item_pin,
360	.iop_unpin = xfs_bud_item_unpin,
361	.iop_unlock = xfs_bud_item_unlock,
362	.iop_committed = xfs_bud_item_committed,
363	.iop_push = xfs_bud_item_push,
364	.iop_committing = xfs_bud_item_committing,
365	};
366
367	/*
368	* Allocate and initialize an bud item with the given number of extents.
369	*/
370	struct xfs_bud_log_item *
371	xfs_bud_init(
372	struct xfs_mount *mp,
373	struct xfs_bui_log_item *buip)
374
375	{
376	struct xfs_bud_log_item *budp;
377
378	budp = kmem_zone_zalloc(xfs_bud_zone, KM_SLEEP);
379	xfs_log_item_init(mp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops);
380	budp->bud_buip = buip;
381	budp->bud_format.bud_bui_id = buip->bui_format.bui_id;
382
383	return budp;
384	}
77d61fe4 DW	385
	386	/*
	387	* Process a bmap update intent item that was recovered from the log.
	388	* We need to update some inode's bmbt.
	389	*/
	390	int
	391	xfs_bui_recover(
	392	struct xfs_mount *mp,
50995582 DW	393	struct xfs_bui_log_item *buip,
50995582 DW	394	struct xfs_defer_ops *dfops)
77d61fe4 DW	395	{
77d61fe4 DW	396	int error = 0;
9f3afb57	397	unsigned int bui_type;
77d61fe4 DW	398	struct xfs_map_extent *bmap;
	399	xfs_fsblock_t startblock_fsb;
	400	xfs_fsblock_t inode_fsb;
e1a4e37c	401	xfs_filblks_t count;
77d61fe4	402	bool op_ok;
9f3afb57 DW	403	struct xfs_bud_log_item *budp;
	404	enum xfs_bmap_intent_type type;
	405	int whichfork;
	406	xfs_exntst_t state;
	407	struct xfs_trans *tp;
	408	struct xfs_inode *ip = NULL;
e1a4e37c	409	struct xfs_bmbt_irec irec;
77d61fe4 DW	410
	411	ASSERT(!test_bit(XFS_BUI_RECOVERED, &buip->bui_flags));
	412
	413	/* Only one mapping operation per BUI... */
	414	if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
	415	set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
	416	xfs_bui_release(buip);
	417	return -EIO;
	418	}
	419
	420	/*
	421	* First check the validity of the extent described by the
	422	* BUI. If anything is bad, then toss the BUI.
	423	*/
	424	bmap = &buip->bui_format.bui_extents[0];
	425	startblock_fsb = XFS_BB_TO_FSB(mp,
	426	XFS_FSB_TO_DADDR(mp, bmap->me_startblock));
	427	inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp,
	428	XFS_INO_TO_FSB(mp, bmap->me_owner)));
	429	switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) {
	430	case XFS_BMAP_MAP:
	431	case XFS_BMAP_UNMAP:
	432	op_ok = true;
	433	break;
	434	default:
	435	op_ok = false;
	436	break;
	437	}
	438	if (!op_ok \|\| startblock_fsb == 0 \|\|
	439	bmap->me_len == 0 \|\|
	440	inode_fsb == 0 \|\|
	441	startblock_fsb >= mp->m_sb.sb_dblocks \|\|
	442	bmap->me_len >= mp->m_sb.sb_agblocks \|\|
	443	inode_fsb >= mp->m_sb.sb_dblocks \|\|
	444	(bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)) {
	445	/*
	446	* This will pull the BUI from the AIL and
	447	* free the memory associated with it.
	448	*/
	449	set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
	450	xfs_bui_release(buip);
	451	return -EIO;
	452	}
	453
fe0be23e DW	454	error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
fe0be23e DW	455	XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
9f3afb57 DW	456	if (error)
	457	return error;
	458	budp = xfs_trans_get_bud(tp, buip);
	459
	460	/* Grab the inode. */
	461	error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip);
	462	if (error)
	463	goto err_inode;
	464
17c12bcd DW	465	if (VFS_I(ip)->i_nlink == 0)
17c12bcd DW	466	xfs_iflags_set(ip, XFS_IRECOVERY);
9f3afb57 DW	467
	468	/* Process deferred bmap item. */
	469	state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ?
	470	XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
	471	whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ?
	472	XFS_ATTR_FORK : XFS_DATA_FORK;
	473	bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK;
	474	switch (bui_type) {
	475	case XFS_BMAP_MAP:
	476	case XFS_BMAP_UNMAP:
	477	type = bui_type;
	478	break;
	479	default:
	480	error = -EFSCORRUPTED;
50995582	481	goto err_inode;
9f3afb57 DW	482	}
	483	xfs_trans_ijoin(tp, ip, 0);
	484
e1a4e37c	485	count = bmap->me_len;
50995582	486	error = xfs_trans_log_finish_bmap_update(tp, budp, dfops, type,
9f3afb57	487	ip, whichfork, bmap->me_startoff,
e1a4e37c	488	bmap->me_startblock, &count, state);
9f3afb57	489	if (error)
50995582	490	goto err_inode;
9f3afb57	491
e1a4e37c DW	492	if (count > 0) {
	493	ASSERT(type == XFS_BMAP_UNMAP);
	494	irec.br_startblock = bmap->me_startblock;
	495	irec.br_blockcount = count;
	496	irec.br_startoff = bmap->me_startoff;
	497	irec.br_state = state;
50995582	498	error = xfs_bmap_unmap_extent(tp->t_mountp, dfops, ip, &irec);
e1a4e37c	499	if (error)
50995582	500	goto err_inode;
e1a4e37c DW	501	}
e1a4e37c DW	502
77d61fe4	503	set_bit(XFS_BUI_RECOVERED, &buip->bui_flags);
9f3afb57 DW	504	error = xfs_trans_commit(tp);
	505	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	506	IRELE(ip);
	507
	508	return error;
	509
9f3afb57 DW	510	err_inode:
	511	xfs_trans_cancel(tp);
	512	if (ip) {
	513	xfs_iunlock(ip, XFS_ILOCK_EXCL);
	514	IRELE(ip);
	515	}
77d61fe4 DW	516	return error;
77d61fe4 DW	517	}