1/*
  2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
  3 * All Rights Reserved.
  4 *
  5 * This program is free software; you can redistribute it and/or
  6 * modify it under the terms of the GNU General Public License as
  7 * published by the Free Software Foundation.
  8 *
  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.
 13 *
 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
 17 */
 18#include "xfs.h"
 19#include "xfs_fs.h"
 20#include "xfs_shared.h"
 21#include "xfs_log_format.h"
 22#include "xfs_trans_resv.h"
 23#include "xfs_sb.h"
 24#include "xfs_ag.h"
 25#include "xfs_mount.h"
 26#include "xfs_trans.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 */
 36xfs_efi_log_item_t *
 37xfs_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	 */
 51	xfs_trans_add_item(tp, &efip->efi_item);
 52	return efip;
 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 */
 60void
 61xfs_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{
 66	uint			next_extent;
 67	xfs_extent_t		*extp;
 68
 69	tp->t_flags |= XFS_TRANS_DIRTY;
 70	efip->efi_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 71
 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;
 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;
 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 */
 91xfs_efd_log_item_t *
 92xfs_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	 */
107	xfs_trans_add_item(tp, &efdp->efd_item);
108	return efdp;
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 */
116void
117xfs_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{
122	uint			next_extent;
123	xfs_extent_t		*extp;
124
125	tp->t_flags |= XFS_TRANS_DIRTY;
126	efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;
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}