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_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_mount.h"
25#include "xfs_trans.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}
134