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1 | /* |
2 | * Copyright (C) 2016 Oracle. All Rights Reserved. | |
3 | * | |
4 | * Author: Darrick J. Wong <darrick.wong@oracle.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it would be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write the Free Software Foundation, | |
18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. | |
19 | */ | |
20 | #ifndef __XFS_REFCOUNT_ITEM_H__ | |
21 | #define __XFS_REFCOUNT_ITEM_H__ | |
22 | ||
23 | /* | |
24 | * There are (currently) two pairs of refcount btree redo item types: | |
25 | * increase and decrease. The log items for these are CUI (refcount | |
26 | * update intent) and CUD (refcount update done). The redo item type | |
27 | * is encoded in the flags field of each xfs_map_extent. | |
28 | * | |
29 | * *I items should be recorded in the *first* of a series of rolled | |
30 | * transactions, and the *D items should be recorded in the same | |
31 | * transaction that records the associated refcountbt updates. | |
32 | * | |
33 | * Should the system crash after the commit of the first transaction | |
34 | * but before the commit of the final transaction in a series, log | |
35 | * recovery will use the redo information recorded by the intent items | |
36 | * to replay the refcountbt metadata updates. | |
37 | */ | |
38 | ||
39 | /* kernel only CUI/CUD definitions */ | |
40 | ||
41 | struct xfs_mount; | |
42 | struct kmem_zone; | |
43 | ||
44 | /* | |
45 | * Max number of extents in fast allocation path. | |
46 | */ | |
47 | #define XFS_CUI_MAX_FAST_EXTENTS 16 | |
48 | ||
49 | /* | |
50 | * Define CUI flag bits. Manipulated by set/clear/test_bit operators. | |
51 | */ | |
52 | #define XFS_CUI_RECOVERED 1 | |
53 | ||
54 | /* | |
55 | * This is the "refcount update intent" log item. It is used to log | |
56 | * the fact that some reverse mappings need to change. It is used in | |
57 | * conjunction with the "refcount update done" log item described | |
58 | * below. | |
59 | * | |
60 | * These log items follow the same rules as struct xfs_efi_log_item; | |
61 | * see the comments about that structure (in xfs_extfree_item.h) for | |
62 | * more details. | |
63 | */ | |
64 | struct xfs_cui_log_item { | |
65 | struct xfs_log_item cui_item; | |
66 | atomic_t cui_refcount; | |
67 | atomic_t cui_next_extent; | |
68 | unsigned long cui_flags; /* misc flags */ | |
69 | struct xfs_cui_log_format cui_format; | |
70 | }; | |
71 | ||
72 | static inline size_t | |
73 | xfs_cui_log_item_sizeof( | |
74 | unsigned int nr) | |
75 | { | |
76 | return offsetof(struct xfs_cui_log_item, cui_format) + | |
77 | xfs_cui_log_format_sizeof(nr); | |
78 | } | |
79 | ||
80 | /* | |
81 | * This is the "refcount update done" log item. It is used to log the | |
82 | * fact that some refcountbt updates mentioned in an earlier cui item | |
83 | * have been performed. | |
84 | */ | |
85 | struct xfs_cud_log_item { | |
86 | struct xfs_log_item cud_item; | |
87 | struct xfs_cui_log_item *cud_cuip; | |
88 | struct xfs_cud_log_format cud_format; | |
89 | }; | |
90 | ||
91 | extern struct kmem_zone *xfs_cui_zone; | |
92 | extern struct kmem_zone *xfs_cud_zone; | |
93 | ||
94 | struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint); | |
95 | struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *, | |
96 | struct xfs_cui_log_item *); | |
97 | void xfs_cui_item_free(struct xfs_cui_log_item *); | |
98 | void xfs_cui_release(struct xfs_cui_log_item *); | |
f997ee21 | 99 | int xfs_cui_recover(struct xfs_mount *mp, struct xfs_cui_log_item *cuip); |
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100 | |
101 | #endif /* __XFS_REFCOUNT_ITEM_H__ */ |