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#ifndef	__XFS_EXTFREE_ITEM_H__
19#define	__XFS_EXTFREE_ITEM_H__
20
21struct xfs_mount;
22struct kmem_zone;
23
24typedef struct xfs_extent {
25	xfs_dfsbno_t	ext_start;
26	xfs_extlen_t	ext_len;
27} xfs_extent_t;
28
29/*
30 * Since an xfs_extent_t has types (start:64, len: 32)
31 * there are different alignments on 32 bit and 64 bit kernels.
32 * So we provide the different variants for use by a
33 * conversion routine.
34 */
35
36#ifndef HAVE_FORMAT32
37typedef struct xfs_extent_32 {
38	__uint64_t	ext_start;
39	__uint32_t	ext_len;
40} __attribute__((packed)) xfs_extent_32_t;
41#endif
42
43typedef struct xfs_extent_64 {
44	__uint64_t	ext_start;
45	__uint32_t	ext_len;
46	__uint32_t	ext_pad;
47} xfs_extent_64_t;
48
49/*
50 * This is the structure used to lay out an efi log item in the
51 * log.  The efi_extents field is a variable size array whose
52 * size is given by efi_nextents.
53 */
54typedef struct xfs_efi_log_format {
55	__uint16_t		efi_type;	/* efi log item type */
56	__uint16_t		efi_size;	/* size of this item */
57	__uint32_t		efi_nextents;	/* # extents to free */
58	__uint64_t		efi_id;		/* efi identifier */
59	xfs_extent_t		efi_extents[1];	/* array of extents to free */
60} xfs_efi_log_format_t;
61
62#ifndef HAVE_FORMAT32
63typedef struct xfs_efi_log_format_32 {
64	__uint16_t		efi_type;	/* efi log item type */
65	__uint16_t		efi_size;	/* size of this item */
66	__uint32_t		efi_nextents;	/* # extents to free */
67	__uint64_t		efi_id;		/* efi identifier */
68	xfs_extent_32_t		efi_extents[1];	/* array of extents to free */
69} __attribute__((packed)) xfs_efi_log_format_32_t;
70#endif
71
72typedef struct xfs_efi_log_format_64 {
73	__uint16_t		efi_type;	/* efi log item type */
74	__uint16_t		efi_size;	/* size of this item */
75	__uint32_t		efi_nextents;	/* # extents to free */
76	__uint64_t		efi_id;		/* efi identifier */
77	xfs_extent_64_t		efi_extents[1];	/* array of extents to free */
78} xfs_efi_log_format_64_t;
79
80/*
81 * This is the structure used to lay out an efd log item in the
82 * log.  The efd_extents array is a variable size array whose
83 * size is given by efd_nextents;
84 */
85typedef struct xfs_efd_log_format {
86	__uint16_t		efd_type;	/* efd log item type */
87	__uint16_t		efd_size;	/* size of this item */
88	__uint32_t		efd_nextents;	/* # of extents freed */
89	__uint64_t		efd_efi_id;	/* id of corresponding efi */
90	xfs_extent_t		efd_extents[1];	/* array of extents freed */
91} xfs_efd_log_format_t;
92
93#ifndef HAVE_FORMAT32
94typedef struct xfs_efd_log_format_32 {
95	__uint16_t		efd_type;	/* efd log item type */
96	__uint16_t		efd_size;	/* size of this item */
97	__uint32_t		efd_nextents;	/* # of extents freed */
98	__uint64_t		efd_efi_id;	/* id of corresponding efi */
99	xfs_extent_32_t		efd_extents[1];	/* array of extents freed */
100} __attribute__((packed)) xfs_efd_log_format_32_t;
101#endif
102
103typedef struct xfs_efd_log_format_64 {
104	__uint16_t		efd_type;	/* efd log item type */
105	__uint16_t		efd_size;	/* size of this item */
106	__uint32_t		efd_nextents;	/* # of extents freed */
107	__uint64_t		efd_efi_id;	/* id of corresponding efi */
108	xfs_extent_64_t		efd_extents[1];	/* array of extents freed */
109} xfs_efd_log_format_64_t;
110
111
112#ifdef __KERNEL__
113
114/*
115 * Max number of extents in fast allocation path.
116 */
117#define	XFS_EFI_MAX_FAST_EXTENTS	16
118
119/*
120 * Define EFI flags.
121 */
122#define	XFS_EFI_RECOVERED	0x1
123#define	XFS_EFI_COMMITTED	0x2
124#define	XFS_EFI_CANCELED	0x4
125
126/*
127 * This is the "extent free intention" log item.  It is used
128 * to log the fact that some extents need to be free.  It is
129 * used in conjunction with the "extent free done" log item
130 * described below.
131 */
132typedef struct xfs_efi_log_item {
133	xfs_log_item_t		efi_item;
134	uint			efi_flags;	/* misc flags */
135	uint			efi_next_extent;
136	xfs_efi_log_format_t	efi_format;
137} xfs_efi_log_item_t;
138
139/*
140 * This is the "extent free done" log item.  It is used to log
141 * the fact that some extents earlier mentioned in an efi item
142 * have been freed.
143 */
144typedef struct xfs_efd_log_item {
145	xfs_log_item_t		efd_item;
146	xfs_efi_log_item_t	*efd_efip;
147	uint			efd_next_extent;
148	xfs_efd_log_format_t	efd_format;
149} xfs_efd_log_item_t;
150
151/*
152 * Max number of extents in fast allocation path.
153 */
154#define	XFS_EFD_MAX_FAST_EXTENTS	16
155
156extern struct kmem_zone	*xfs_efi_zone;
157extern struct kmem_zone	*xfs_efd_zone;
158
159xfs_efi_log_item_t	*xfs_efi_init(struct xfs_mount *, uint);
160xfs_efd_log_item_t	*xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
161				      uint);
162int			xfs_efi_copy_format(xfs_log_iovec_t *buf,
163					    xfs_efi_log_format_t *dst_efi_fmt);
164void			xfs_efi_item_free(xfs_efi_log_item_t *);
165
166#endif	/* __KERNEL__ */
167
168#endif	/* __XFS_EXTFREE_ITEM_H__ */
169