Add linux-next specific files for 20110716
[linux-2.6/next.git] / fs / xfs / xfs_extfree_item.h
blob375f68e42531a614138fa7a204e73c0e61baa14a
1 /*
2 * Copyright (c) 2000,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
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.
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.
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
18 #ifndef __XFS_EXTFREE_ITEM_H__
19 #define __XFS_EXTFREE_ITEM_H__
21 struct xfs_mount;
22 struct kmem_zone;
24 typedef struct xfs_extent {
25 xfs_dfsbno_t ext_start;
26 xfs_extlen_t ext_len;
27 } xfs_extent_t;
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.
36 typedef struct xfs_extent_32 {
37 __uint64_t ext_start;
38 __uint32_t ext_len;
39 } __attribute__((packed)) xfs_extent_32_t;
41 typedef struct xfs_extent_64 {
42 __uint64_t ext_start;
43 __uint32_t ext_len;
44 __uint32_t ext_pad;
45 } xfs_extent_64_t;
48 * This is the structure used to lay out an efi log item in the
49 * log. The efi_extents field is a variable size array whose
50 * size is given by efi_nextents.
52 typedef struct xfs_efi_log_format {
53 __uint16_t efi_type; /* efi log item type */
54 __uint16_t efi_size; /* size of this item */
55 __uint32_t efi_nextents; /* # extents to free */
56 __uint64_t efi_id; /* efi identifier */
57 xfs_extent_t efi_extents[1]; /* array of extents to free */
58 } xfs_efi_log_format_t;
60 typedef struct xfs_efi_log_format_32 {
61 __uint16_t efi_type; /* efi log item type */
62 __uint16_t efi_size; /* size of this item */
63 __uint32_t efi_nextents; /* # extents to free */
64 __uint64_t efi_id; /* efi identifier */
65 xfs_extent_32_t efi_extents[1]; /* array of extents to free */
66 } __attribute__((packed)) xfs_efi_log_format_32_t;
68 typedef struct xfs_efi_log_format_64 {
69 __uint16_t efi_type; /* efi log item type */
70 __uint16_t efi_size; /* size of this item */
71 __uint32_t efi_nextents; /* # extents to free */
72 __uint64_t efi_id; /* efi identifier */
73 xfs_extent_64_t efi_extents[1]; /* array of extents to free */
74 } xfs_efi_log_format_64_t;
77 * This is the structure used to lay out an efd log item in the
78 * log. The efd_extents array is a variable size array whose
79 * size is given by efd_nextents;
81 typedef struct xfs_efd_log_format {
82 __uint16_t efd_type; /* efd log item type */
83 __uint16_t efd_size; /* size of this item */
84 __uint32_t efd_nextents; /* # of extents freed */
85 __uint64_t efd_efi_id; /* id of corresponding efi */
86 xfs_extent_t efd_extents[1]; /* array of extents freed */
87 } xfs_efd_log_format_t;
89 typedef struct xfs_efd_log_format_32 {
90 __uint16_t efd_type; /* efd log item type */
91 __uint16_t efd_size; /* size of this item */
92 __uint32_t efd_nextents; /* # of extents freed */
93 __uint64_t efd_efi_id; /* id of corresponding efi */
94 xfs_extent_32_t efd_extents[1]; /* array of extents freed */
95 } __attribute__((packed)) xfs_efd_log_format_32_t;
97 typedef struct xfs_efd_log_format_64 {
98 __uint16_t efd_type; /* efd log item type */
99 __uint16_t efd_size; /* size of this item */
100 __uint32_t efd_nextents; /* # of extents freed */
101 __uint64_t efd_efi_id; /* id of corresponding efi */
102 xfs_extent_64_t efd_extents[1]; /* array of extents freed */
103 } xfs_efd_log_format_64_t;
106 #ifdef __KERNEL__
109 * Max number of extents in fast allocation path.
111 #define XFS_EFI_MAX_FAST_EXTENTS 16
114 * Define EFI flag bits. Manipulated by set/clear/test_bit operators.
116 #define XFS_EFI_RECOVERED 1
117 #define XFS_EFI_COMMITTED 2
120 * This is the "extent free intention" log item. It is used
121 * to log the fact that some extents need to be free. It is
122 * used in conjunction with the "extent free done" log item
123 * described below.
125 typedef struct xfs_efi_log_item {
126 xfs_log_item_t efi_item;
127 atomic_t efi_next_extent;
128 unsigned long efi_flags; /* misc flags */
129 xfs_efi_log_format_t efi_format;
130 } xfs_efi_log_item_t;
133 * This is the "extent free done" log item. It is used to log
134 * the fact that some extents earlier mentioned in an efi item
135 * have been freed.
137 typedef struct xfs_efd_log_item {
138 xfs_log_item_t efd_item;
139 xfs_efi_log_item_t *efd_efip;
140 uint efd_next_extent;
141 xfs_efd_log_format_t efd_format;
142 } xfs_efd_log_item_t;
145 * Max number of extents in fast allocation path.
147 #define XFS_EFD_MAX_FAST_EXTENTS 16
149 extern struct kmem_zone *xfs_efi_zone;
150 extern struct kmem_zone *xfs_efd_zone;
152 xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint);
153 xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
154 uint);
155 int xfs_efi_copy_format(xfs_log_iovec_t *buf,
156 xfs_efi_log_format_t *dst_efi_fmt);
157 void xfs_efi_item_free(xfs_efi_log_item_t *);
159 #endif /* __KERNEL__ */
161 #endif /* __XFS_EXTFREE_ITEM_H__ */