1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
|
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*/
#ifndef __XFS_REFCOUNT_H__
#define __XFS_REFCOUNT_H__
struct xfs_trans;
struct xfs_mount;
struct xfs_perag;
struct xfs_btree_cur;
struct xfs_bmbt_irec;
struct xfs_refcount_irec;
extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur,
xfs_fsblock_t bno, int *stat);
extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur,
xfs_fsblock_t bno, int *stat);
extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur,
xfs_fsblock_t bno, int *stat);
extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur,
struct xfs_refcount_irec *irec, int *stat);
enum xfs_refcount_intent_type {
XFS_REFCOUNT_INCREASE = 1,
XFS_REFCOUNT_DECREASE,
XFS_REFCOUNT_ALLOC_COW,
XFS_REFCOUNT_FREE_COW,
};
#define XFS_REFCOUNT_INTENT_STRINGS \
{ XFS_REFCOUNT_INCREASE, "incr" }, \
{ XFS_REFCOUNT_DECREASE, "decr" }, \
{ XFS_REFCOUNT_ALLOC_COW, "alloc_cow" }, \
{ XFS_REFCOUNT_FREE_COW, "free_cow" }
struct xfs_refcount_intent {
struct list_head ri_list;
enum xfs_refcount_intent_type ri_type;
xfs_fsblock_t ri_startblock;
xfs_filblks_t ri_blockcount;
bool ri_realtime;
};
void xfs_refcount_increase_extent(struct xfs_trans *tp, bool isrt,
struct xfs_bmbt_irec *irec);
void xfs_refcount_decrease_extent(struct xfs_trans *tp, bool isrt,
struct xfs_bmbt_irec *irec);
extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp,
struct xfs_btree_cur *rcur, int error);
extern int xfs_refcount_finish_one(struct xfs_trans *tp,
struct xfs_refcount_intent *refc, struct xfs_btree_cur **pcur);
extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur,
xfs_fsblock_t bno, xfs_filblks_t aglen, xfs_fsblock_t *fbno,
xfs_filblks_t *flen, bool find_end_of_shared);
void xfs_refcount_alloc_cow_extent(struct xfs_trans *tp, bool isrt,
xfs_fsblock_t fsb, xfs_filblks_t len);
void xfs_refcount_free_cow_extent(struct xfs_trans *tp, bool isrt,
xfs_fsblock_t fsb, xfs_filblks_t len);
extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp,
struct xfs_perag *pag);
/*
* While we're adjusting the refcounts records of an extent, we have
* to keep an eye on the number of extents we're dirtying -- run too
* many in a single transaction and we'll exceed the transaction's
* reservation and crash the fs. Each record adds 12 bytes to the
* log (plus any key updates) so we'll conservatively assume 32 bytes
* per record. We must also leave space for btree splits on both ends
* of the range and space for the CUD and a new CUI. Each EFI that we
* attach to the transaction also consumes ~32 bytes.
*/
#define XFS_REFCOUNT_ITEM_OVERHEAD 32
extern int xfs_refcount_has_record(struct xfs_btree_cur *cur,
xfs_fsblock_t bno, xfs_filblks_t len, bool *exists);
union xfs_btree_rec;
void xfs_refcount_btrec_to_irec(struct xfs_btree_cur *cur,
const union xfs_btree_rec *rec,
struct xfs_refcount_irec *irec);
extern int xfs_refcount_insert(struct xfs_btree_cur *cur,
struct xfs_refcount_irec *irec, int *stat);
#endif /* __XFS_REFCOUNT_H__ */
|
