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Linux kernel mirror (for testing)
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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
21/* kernel only EFI/EFD definitions */
22
23struct xfs_mount;
24struct kmem_zone;
25
26/*
27 * Max number of extents in fast allocation path.
28 */
29#define XFS_EFI_MAX_FAST_EXTENTS 16
30
31/*
32 * Define EFI flag bits. Manipulated by set/clear/test_bit operators.
33 */
34#define XFS_EFI_RECOVERED 1
35
36/*
37 * This is the "extent free intention" log item. It is used to log the fact
38 * that some extents need to be free. It is used in conjunction with the
39 * "extent free done" log item described below.
40 *
41 * The EFI is reference counted so that it is not freed prior to both the EFI
42 * and EFD being committed and unpinned. This ensures that when the last
43 * reference goes away the EFI will always be in the AIL as it has been
44 * unpinned, regardless of whether the EFD is processed before or after the EFI.
45 */
46typedef struct xfs_efi_log_item {
47 xfs_log_item_t efi_item;
48 atomic_t efi_refcount;
49 atomic_t efi_next_extent;
50 unsigned long efi_flags; /* misc flags */
51 xfs_efi_log_format_t efi_format;
52} xfs_efi_log_item_t;
53
54/*
55 * This is the "extent free done" log item. It is used to log
56 * the fact that some extents earlier mentioned in an efi item
57 * have been freed.
58 */
59typedef struct xfs_efd_log_item {
60 xfs_log_item_t efd_item;
61 xfs_efi_log_item_t *efd_efip;
62 uint efd_next_extent;
63 xfs_efd_log_format_t efd_format;
64} xfs_efd_log_item_t;
65
66/*
67 * Max number of extents in fast allocation path.
68 */
69#define XFS_EFD_MAX_FAST_EXTENTS 16
70
71extern struct kmem_zone *xfs_efi_zone;
72extern struct kmem_zone *xfs_efd_zone;
73
74xfs_efi_log_item_t *xfs_efi_init(struct xfs_mount *, uint);
75xfs_efd_log_item_t *xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
76 uint);
77int xfs_efi_copy_format(xfs_log_iovec_t *buf,
78 xfs_efi_log_format_t *dst_efi_fmt);
79void xfs_efi_item_free(xfs_efi_log_item_t *);
80
81#endif /* __XFS_EXTFREE_ITEM_H__ */