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_types.h"
 21#include "xfs_log.h"
 22#include "xfs_trans.h"
 23#include "xfs_sb.h"
 24#include "xfs_ag.h"
 25#include "xfs_mount.h"
 26#include "xfs_trans_priv.h"
 27#include "xfs_extfree_item.h"
 28
 29/*
 30 * This routine is called to allocate an "extent free intention"
 31 * log item that will hold nextents worth of extents.  The
 32 * caller must use all nextents extents, because we are not
 33 * flexible about this at all.
 34 */
 35xfs_efi_log_item_t *
 36xfs_trans_get_efi(xfs_trans_t	*tp,
 37		  uint		nextents)
 38{
 39	xfs_efi_log_item_t	*efip;
 40
 41	ASSERT(tp != NULL);
 42	ASSERT(nextents > 0);
 43
 44	efip = xfs_efi_init(tp->t_mountp, nextents);
 45	ASSERT(efip != NULL);
 46
 47	/*
 48	 * Get a log_item_desc to point at the new item.
 49	 */
 50	xfs_trans_add_item(tp, &efip->efi_item);
 51	return efip;
 52}
 53
 54/*
 55 * This routine is called to indicate that the described
 56 * extent is to be logged as needing to be freed.  It should
 57 * be called once for each extent to be freed.
 58 */
 59void
 60xfs_trans_log_efi_extent(xfs_trans_t		*tp,
 61			 xfs_efi_log_item_t	*efip,
 62			 xfs_fsblock_t		start_block,
 63			 xfs_extlen_t		ext_len)
 64{
 65	uint			next_extent;
 66	xfs_extent_t		*extp;
 67
 68	tp->t_flags |= XFS_TRANS_DIRTY;
 69	efip->efi_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 70
 71	/*
 72	 * atomic_inc_return gives us the value after the increment;
 73	 * we want to use it as an array index so we need to subtract 1 from
 74	 * it.
 75	 */
 76	next_extent = atomic_inc_return(&efip->efi_next_extent) - 1;
 77	ASSERT(next_extent < efip->efi_format.efi_nextents);
 78	extp = &(efip->efi_format.efi_extents[next_extent]);
 79	extp->ext_start = start_block;
 80	extp->ext_len = ext_len;
 81}
 82
 83
 84/*
 85 * This routine is called to allocate an "extent free done"
 86 * log item that will hold nextents worth of extents.  The
 87 * caller must use all nextents extents, because we are not
 88 * flexible about this at all.
 89 */
 90xfs_efd_log_item_t *
 91xfs_trans_get_efd(xfs_trans_t		*tp,
 92		  xfs_efi_log_item_t	*efip,
 93		  uint			nextents)
 94{
 95	xfs_efd_log_item_t	*efdp;
 96
 97	ASSERT(tp != NULL);
 98	ASSERT(nextents > 0);
 99
100	efdp = xfs_efd_init(tp->t_mountp, efip, nextents);
101	ASSERT(efdp != NULL);
102
103	/*
104	 * Get a log_item_desc to point at the new item.
105	 */
106	xfs_trans_add_item(tp, &efdp->efd_item);
107	return efdp;
108}
109
110/*
111 * This routine is called to indicate that the described
112 * extent is to be logged as having been freed.  It should
113 * be called once for each extent freed.
114 */
115void
116xfs_trans_log_efd_extent(xfs_trans_t		*tp,
117			 xfs_efd_log_item_t	*efdp,
118			 xfs_fsblock_t		start_block,
119			 xfs_extlen_t		ext_len)
120{
121	uint			next_extent;
122	xfs_extent_t		*extp;
123
124	tp->t_flags |= XFS_TRANS_DIRTY;
125	efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;
126
127	next_extent = efdp->efd_next_extent;
128	ASSERT(next_extent < efdp->efd_format.efd_nextents);
129	extp = &(efdp->efd_format.efd_extents[next_extent]);
130	extp->ext_start = start_block;
131	extp->ext_len = ext_len;
132	efdp->efd_next_extent++;
133}