1 // SPDX-License-Identifier: GPL-2.0+ <<
2 /* 1 /*
3 * Copyright (C) 2016 Oracle. All Rights Rese 2 * Copyright (C) 2016 Oracle. All Rights Reserved.
>> 3 *
4 * Author: Darrick J. Wong <darrick.wong@oracl 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.
5 */ 19 */
6 #ifndef __XFS_REFCOUNT_ITEM_H__ 20 #ifndef __XFS_REFCOUNT_ITEM_H__
7 #define __XFS_REFCOUNT_ITEM_H__ 21 #define __XFS_REFCOUNT_ITEM_H__
8 22
9 /* 23 /*
10 * There are (currently) two pairs of refcount 24 * There are (currently) two pairs of refcount btree redo item types:
11 * increase and decrease. The log items for t 25 * increase and decrease. The log items for these are CUI (refcount
12 * update intent) and CUD (refcount update don 26 * update intent) and CUD (refcount update done). The redo item type
13 * is encoded in the flags field of each xfs_m 27 * is encoded in the flags field of each xfs_map_extent.
14 * 28 *
15 * *I items should be recorded in the *first* 29 * *I items should be recorded in the *first* of a series of rolled
16 * transactions, and the *D items should be re 30 * transactions, and the *D items should be recorded in the same
17 * transaction that records the associated ref 31 * transaction that records the associated refcountbt updates.
18 * 32 *
19 * Should the system crash after the commit of 33 * Should the system crash after the commit of the first transaction
20 * but before the commit of the final transact 34 * but before the commit of the final transaction in a series, log
21 * recovery will use the redo information reco 35 * recovery will use the redo information recorded by the intent items
22 * to replay the refcountbt metadata updates. 36 * to replay the refcountbt metadata updates.
23 */ 37 */
24 38
25 /* kernel only CUI/CUD definitions */ 39 /* kernel only CUI/CUD definitions */
26 40
27 struct xfs_mount; 41 struct xfs_mount;
28 struct kmem_cache; !! 42 struct kmem_zone;
29 43
30 /* 44 /*
31 * Max number of extents in fast allocation pa 45 * Max number of extents in fast allocation path.
32 */ 46 */
33 #define XFS_CUI_MAX_FAST_EXTENTS 16 47 #define XFS_CUI_MAX_FAST_EXTENTS 16
34 48
35 /* 49 /*
>> 50 * Define CUI flag bits. Manipulated by set/clear/test_bit operators.
>> 51 */
>> 52 #define XFS_CUI_RECOVERED 1
>> 53
>> 54 /*
36 * This is the "refcount update intent" log it 55 * This is the "refcount update intent" log item. It is used to log
37 * the fact that some reverse mappings need to 56 * the fact that some reverse mappings need to change. It is used in
38 * conjunction with the "refcount update done" 57 * conjunction with the "refcount update done" log item described
39 * below. 58 * below.
40 * 59 *
41 * These log items follow the same rules as st 60 * These log items follow the same rules as struct xfs_efi_log_item;
42 * see the comments about that structure (in x 61 * see the comments about that structure (in xfs_extfree_item.h) for
43 * more details. 62 * more details.
44 */ 63 */
45 struct xfs_cui_log_item { 64 struct xfs_cui_log_item {
46 struct xfs_log_item cui_it 65 struct xfs_log_item cui_item;
47 atomic_t cui_re 66 atomic_t cui_refcount;
48 atomic_t cui_ne 67 atomic_t cui_next_extent;
>> 68 unsigned long cui_flags; /* misc flags */
49 struct xfs_cui_log_format cui_fo 69 struct xfs_cui_log_format cui_format;
50 }; 70 };
51 71
52 static inline size_t 72 static inline size_t
53 xfs_cui_log_item_sizeof( 73 xfs_cui_log_item_sizeof(
54 unsigned int nr) 74 unsigned int nr)
55 { 75 {
56 return offsetof(struct xfs_cui_log_ite 76 return offsetof(struct xfs_cui_log_item, cui_format) +
57 xfs_cui_log_format_siz 77 xfs_cui_log_format_sizeof(nr);
58 } 78 }
59 79
60 /* 80 /*
61 * This is the "refcount update done" log item 81 * This is the "refcount update done" log item. It is used to log the
62 * fact that some refcountbt updates mentioned 82 * fact that some refcountbt updates mentioned in an earlier cui item
63 * have been performed. 83 * have been performed.
64 */ 84 */
65 struct xfs_cud_log_item { 85 struct xfs_cud_log_item {
66 struct xfs_log_item cud_it 86 struct xfs_log_item cud_item;
67 struct xfs_cui_log_item *cud_c 87 struct xfs_cui_log_item *cud_cuip;
68 struct xfs_cud_log_format cud_fo 88 struct xfs_cud_log_format cud_format;
69 }; 89 };
70 90
71 extern struct kmem_cache *xfs_cui_cache !! 91 extern struct kmem_zone *xfs_cui_zone;
72 extern struct kmem_cache *xfs_cud_cache !! 92 extern struct kmem_zone *xfs_cud_zone;
73 <<
74 struct xfs_refcount_intent; <<
75 93
76 void xfs_refcount_defer_add(struct xfs_trans * !! 94 struct xfs_cui_log_item *xfs_cui_init(struct xfs_mount *, uint);
77 struct xfs_refcount_intent *ri !! 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 *);
>> 99 int xfs_cui_recover(struct xfs_mount *mp, struct xfs_cui_log_item *cuip);
78 100
79 #endif /* __XFS_REFCOUNT_ITEM_H__ */ 101 #endif /* __XFS_REFCOUNT_ITEM_H__ */
80 102
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