[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / xfs / xfs_trans_extfree.c

/*
 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * 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.
 *
 * 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_types.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_mount.h"
#include "xfs_trans_priv.h"
#include "xfs_extfree_item.h"

/*
 * This routine is called to allocate an "extent free intention"
 * log item that will hold nextents worth of extents.  The
 * caller must use all nextents extents, because we are not
 * flexible about this at all.
 */
xfs_efi_log_item_t *
xfs_trans_get_efi(xfs_trans_t	*tp,
		  uint		nextents)
{
	xfs_efi_log_item_t	*efip;

	ASSERT(tp != NULL);
	ASSERT(nextents > 0);

	efip = xfs_efi_init(tp->t_mountp, nextents);
	ASSERT(efip != NULL);

	/*
	 * Get a log_item_desc to point at the new item.
	 */
	xfs_trans_add_item(tp, &efip->efi_item);
	return efip;
}

/*
 * This routine is called to indicate that the described
 * extent is to be logged as needing to be freed.  It should
 * be called once for each extent to be freed.
 */
void
xfs_trans_log_efi_extent(xfs_trans_t		*tp,
			 xfs_efi_log_item_t	*efip,
			 xfs_fsblock_t		start_block,
			 xfs_extlen_t		ext_len)
{
	uint			next_extent;
	xfs_extent_t		*extp;

	tp->t_flags |= XFS_TRANS_DIRTY;
	efip->efi_item.li_desc->lid_flags |= XFS_LID_DIRTY;

	/*
	 * atomic_inc_return gives us the value after the increment;
	 * we want to use it as an array index so we need to subtract 1 from
	 * it.
	 */
	next_extent = atomic_inc_return(&efip->efi_next_extent) - 1;
	ASSERT(next_extent < efip->efi_format.efi_nextents);
	extp = &(efip->efi_format.efi_extents[next_extent]);
	extp->ext_start = start_block;
	extp->ext_len = ext_len;
}


/*
 * This routine is called to allocate an "extent free done"
 * log item that will hold nextents worth of extents.  The
 * caller must use all nextents extents, because we are not
 * flexible about this at all.
 */
xfs_efd_log_item_t *
xfs_trans_get_efd(xfs_trans_t		*tp,
		  xfs_efi_log_item_t	*efip,
		  uint			nextents)
{
	xfs_efd_log_item_t	*efdp;

	ASSERT(tp != NULL);
	ASSERT(nextents > 0);

	efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
	ASSERT(efdp != NULL);

	/*
	 * Get a log_item_desc to point at the new item.
	 */
	xfs_trans_add_item(tp, &efdp->efd_item);
	return efdp;
}

/*
 * This routine is called to indicate that the described
 * extent is to be logged as having been freed.  It should
 * be called once for each extent freed.
 */
void
xfs_trans_log_efd_extent(xfs_trans_t		*tp,
			 xfs_efd_log_item_t	*efdp,
			 xfs_fsblock_t		start_block,
			 xfs_extlen_t		ext_len)
{
	uint			next_extent;
	xfs_extent_t		*extp;

	tp->t_flags |= XFS_TRANS_DIRTY;
	efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;

	next_extent = efdp->efd_next_extent;
	ASSERT(next_extent < efdp->efd_format.efd_nextents);
	extp = &(efdp->efd_format.efd_extents[next_extent]);
	extp->ext_start = start_block;
	extp->ext_len = ext_len;
	efdp->efd_next_extent++;
}
Commit	Line	Data
1da177e4	1	/*
7b718769 NS	2	* Copyright (c) 2000,2005 Silicon Graphics, Inc.
7b718769 NS	3	* All Rights Reserved.
1da177e4	4	*
7b718769 NS	5	* This program is free software; you can redistribute it and/or
7b718769 NS	6	* modify it under the terms of the GNU General Public License as
1da177e4 LT	7	* published by the Free Software Foundation.
1da177e4 LT	8	*
7b718769 NS	9	* This program is distributed in the hope that it would be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
1da177e4	13	*
7b718769 NS	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write the Free Software Foundation,
	16	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
1da177e4	17	*/
1da177e4	18	#include "xfs.h"
a844f451	19	#include "xfs_fs.h"
1da177e4	20	#include "xfs_types.h"
1da177e4	21	#include "xfs_log.h"
a844f451	22	#include "xfs_inum.h"
1da177e4 LT	23	#include "xfs_trans.h"
1da177e4 LT	24	#include "xfs_sb.h"
da353b0d	25	#include "xfs_ag.h"
1da177e4 LT	26	#include "xfs_mount.h"
	27	#include "xfs_trans_priv.h"
	28	#include "xfs_extfree_item.h"
	29
	30	/*
	31	* This routine is called to allocate an "extent free intention"
	32	* log item that will hold nextents worth of extents. The
	33	* caller must use all nextents extents, because we are not
	34	* flexible about this at all.
	35	*/
	36	xfs_efi_log_item_t *
	37	xfs_trans_get_efi(xfs_trans_t *tp,
	38	uint nextents)
	39	{
	40	xfs_efi_log_item_t *efip;
	41
	42	ASSERT(tp != NULL);
	43	ASSERT(nextents > 0);
	44
	45	efip = xfs_efi_init(tp->t_mountp, nextents);
	46	ASSERT(efip != NULL);
	47
	48	/*
	49	* Get a log_item_desc to point at the new item.
	50	*/
e98c414f CH	51	xfs_trans_add_item(tp, &efip->efi_item);
e98c414f CH	52	return efip;
1da177e4 LT	53	}
	54
	55	/*
	56	* This routine is called to indicate that the described
	57	* extent is to be logged as needing to be freed. It should
	58	* be called once for each extent to be freed.
	59	*/
	60	void
	61	xfs_trans_log_efi_extent(xfs_trans_t *tp,
	62	xfs_efi_log_item_t *efip,
	63	xfs_fsblock_t start_block,
	64	xfs_extlen_t ext_len)
	65	{
1da177e4 LT	66	uint next_extent;
	67	xfs_extent_t *extp;
	68
1da177e4	69	tp->t_flags \|= XFS_TRANS_DIRTY;
e98c414f	70	efip->efi_item.li_desc->lid_flags \|= XFS_LID_DIRTY;
1da177e4	71
b199c8a4 DC	72	/*
	73	* atomic_inc_return gives us the value after the increment;
	74	* we want to use it as an array index so we need to subtract 1 from
	75	* it.
	76	*/
	77	next_extent = atomic_inc_return(&efip->efi_next_extent) - 1;
1da177e4 LT	78	ASSERT(next_extent < efip->efi_format.efi_nextents);
	79	extp = &(efip->efi_format.efi_extents[next_extent]);
	80	extp->ext_start = start_block;
	81	extp->ext_len = ext_len;
1da177e4 LT	82	}
	83
	84
	85	/*
	86	* This routine is called to allocate an "extent free done"
	87	* log item that will hold nextents worth of extents. The
	88	* caller must use all nextents extents, because we are not
	89	* flexible about this at all.
	90	*/
	91	xfs_efd_log_item_t *
	92	xfs_trans_get_efd(xfs_trans_t *tp,
	93	xfs_efi_log_item_t *efip,
	94	uint nextents)
	95	{
	96	xfs_efd_log_item_t *efdp;
	97
	98	ASSERT(tp != NULL);
	99	ASSERT(nextents > 0);
	100
	101	efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
	102	ASSERT(efdp != NULL);
	103
	104	/*
	105	* Get a log_item_desc to point at the new item.
	106	*/
e98c414f CH	107	xfs_trans_add_item(tp, &efdp->efd_item);
e98c414f CH	108	return efdp;
1da177e4 LT	109	}
	110
	111	/*
	112	* This routine is called to indicate that the described
	113	* extent is to be logged as having been freed. It should
	114	* be called once for each extent freed.
	115	*/
	116	void
	117	xfs_trans_log_efd_extent(xfs_trans_t *tp,
	118	xfs_efd_log_item_t *efdp,
	119	xfs_fsblock_t start_block,
	120	xfs_extlen_t ext_len)
	121	{
1da177e4 LT	122	uint next_extent;
	123	xfs_extent_t *extp;
	124
1da177e4	125	tp->t_flags \|= XFS_TRANS_DIRTY;
e98c414f	126	efdp->efd_item.li_desc->lid_flags \|= XFS_LID_DIRTY;
1da177e4 LT	127
	128	next_extent = efdp->efd_next_extent;
	129	ASSERT(next_extent < efdp->efd_format.efd_nextents);
	130	extp = &(efdp->efd_format.efd_extents[next_extent]);
	131	extp->ext_start = start_block;
	132	extp->ext_len = ext_len;
	133	efdp->efd_next_extent++;
	134	}