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#include "xfs_alloc.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 * Free an extent and log it to the EFD. Note that the transaction is marked
113 * dirty regardless of whether the extent free succeeds or fails to support the
114 * EFI/EFD lifecycle rules.
115 */
116int
117xfs_trans_free_extent(
118	struct xfs_trans	*tp,
119	struct xfs_efd_log_item	*efdp,
120	xfs_fsblock_t		start_block,
121	xfs_extlen_t		ext_len)
122{
123	uint			next_extent;
124	struct xfs_extent	*extp;
125	int			error;
126
127	error = xfs_free_extent(tp, start_block, ext_len);
128
129	/*
130	 * Mark the transaction dirty, even on error. This ensures the
131	 * transaction is aborted, which:
132	 *
133	 * 1.) releases the EFI and frees the EFD
134	 * 2.) shuts down the filesystem
135	 */
136	tp->t_flags |= XFS_TRANS_DIRTY;
137	efdp->efd_item.li_desc->lid_flags |= XFS_LID_DIRTY;
138
139	next_extent = efdp->efd_next_extent;
140	ASSERT(next_extent < efdp->efd_format.efd_nextents);
141	extp = &(efdp->efd_format.efd_extents[next_extent]);
142	extp->ext_start = start_block;
143	extp->ext_len = ext_len;
144	efdp->efd_next_extent++;
145
146	return error;
147}
148