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37b3b4d6 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
bc859611 DW |
2 | /* |
3 | * Copyright (C) 2016 Oracle. All Rights Reserved. | |
bc859611 | 4 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
bc859611 DW |
5 | */ |
6 | #ifndef __XFS_REFCOUNT_H__ | |
7 | #define __XFS_REFCOUNT_H__ | |
8 | ||
9 | extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur, | |
10 | xfs_agblock_t bno, int *stat); | |
11 | extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur, | |
12 | xfs_agblock_t bno, int *stat); | |
43e73fb0 DW |
13 | extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur, |
14 | xfs_agblock_t bno, int *stat); | |
bc859611 DW |
15 | extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, |
16 | struct xfs_refcount_irec *irec, int *stat); | |
17 | ||
c1ea4010 DW |
18 | enum xfs_refcount_intent_type { |
19 | XFS_REFCOUNT_INCREASE = 1, | |
20 | XFS_REFCOUNT_DECREASE, | |
21 | XFS_REFCOUNT_ALLOC_COW, | |
22 | XFS_REFCOUNT_FREE_COW, | |
23 | }; | |
24 | ||
25 | struct xfs_refcount_intent { | |
26 | struct list_head ri_list; | |
27 | enum xfs_refcount_intent_type ri_type; | |
28 | xfs_fsblock_t ri_startblock; | |
29 | xfs_extlen_t ri_blockcount; | |
30 | }; | |
31 | ||
21375e5d BF |
32 | extern int xfs_refcount_increase_extent(struct xfs_trans *tp, |
33 | struct xfs_bmbt_irec *irec); | |
34 | extern int xfs_refcount_decrease_extent(struct xfs_trans *tp, | |
35 | struct xfs_bmbt_irec *irec); | |
23a15a6c DW |
36 | |
37 | extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp, | |
38 | struct xfs_btree_cur *rcur, int error); | |
39 | extern int xfs_refcount_finish_one(struct xfs_trans *tp, | |
7b3ab230 BF |
40 | enum xfs_refcount_intent_type type, xfs_fsblock_t startblock, |
41 | xfs_extlen_t blockcount, xfs_fsblock_t *new_fsb, | |
42 | xfs_extlen_t *new_len, struct xfs_btree_cur **pcur); | |
23a15a6c | 43 | |
94097330 DW |
44 | extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, |
45 | xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, | |
46 | xfs_extlen_t *flen, bool find_end_of_shared); | |
47 | ||
21375e5d BF |
48 | extern int xfs_refcount_alloc_cow_extent(struct xfs_trans *tp, |
49 | xfs_fsblock_t fsb, xfs_extlen_t len); | |
50 | extern int xfs_refcount_free_cow_extent(struct xfs_trans *tp, | |
51 | xfs_fsblock_t fsb, xfs_extlen_t len); | |
10e65503 DW |
52 | extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp, |
53 | xfs_agnumber_t agno); | |
54 | ||
594956fa DW |
55 | /* |
56 | * While we're adjusting the refcounts records of an extent, we have | |
57 | * to keep an eye on the number of extents we're dirtying -- run too | |
58 | * many in a single transaction and we'll exceed the transaction's | |
59 | * reservation and crash the fs. Each record adds 12 bytes to the | |
60 | * log (plus any key updates) so we'll conservatively assume 32 bytes | |
61 | * per record. We must also leave space for btree splits on both ends | |
62 | * of the range and space for the CUD and a new CUI. | |
63 | */ | |
64 | #define XFS_REFCOUNT_ITEM_OVERHEAD 32 | |
65 | ||
66 | static inline xfs_fileoff_t xfs_refcount_max_unmap(int log_res) | |
67 | { | |
68 | return (log_res * 3 / 4) / XFS_REFCOUNT_ITEM_OVERHEAD; | |
69 | } | |
70 | ||
1048d0e2 DW |
71 | extern int xfs_refcount_has_record(struct xfs_btree_cur *cur, |
72 | xfs_agblock_t bno, xfs_extlen_t len, bool *exists); | |
aa465192 DW |
73 | union xfs_btree_rec; |
74 | extern void xfs_refcount_btrec_to_irec(union xfs_btree_rec *rec, | |
75 | struct xfs_refcount_irec *irec); | |
76 | extern int xfs_refcount_insert(struct xfs_btree_cur *cur, | |
77 | struct xfs_refcount_irec *irec, int *stat); | |
1048d0e2 | 78 | |
bc859611 | 79 | #endif /* __XFS_REFCOUNT_H__ */ |