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0b61f8a4 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
bdf28630 DW |
2 | /* |
3 | * Copyright (C) 2016 Oracle. All Rights Reserved. | |
bdf28630 | 4 | * Author: Darrick J. Wong <darrick.wong@oracle.com> |
bdf28630 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); | |
08daa3cc DW |
13 | extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur, |
14 | xfs_agblock_t bno, int *stat); | |
bdf28630 DW |
15 | extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, |
16 | struct xfs_refcount_irec *irec, int *stat); | |
17 | ||
f997ee21 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 | ||
33ba6129 DW |
32 | extern int xfs_refcount_increase_extent(struct xfs_mount *mp, |
33 | struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec); | |
34 | extern int xfs_refcount_decrease_extent(struct xfs_mount *mp, | |
35 | struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec); | |
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, | |
40 | struct xfs_defer_ops *dfops, enum xfs_refcount_intent_type type, | |
41 | xfs_fsblock_t startblock, xfs_extlen_t blockcount, | |
42 | xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len, | |
43 | struct xfs_btree_cur **pcur); | |
44 | ||
350a27a6 DW |
45 | extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, |
46 | xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, | |
47 | xfs_extlen_t *flen, bool find_end_of_shared); | |
48 | ||
174edb0e DW |
49 | extern int xfs_refcount_alloc_cow_extent(struct xfs_mount *mp, |
50 | struct xfs_defer_ops *dfops, xfs_fsblock_t fsb, | |
51 | xfs_extlen_t len); | |
52 | extern int xfs_refcount_free_cow_extent(struct xfs_mount *mp, | |
53 | struct xfs_defer_ops *dfops, xfs_fsblock_t fsb, | |
54 | xfs_extlen_t len); | |
55 | extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp, | |
56 | xfs_agnumber_t agno); | |
57 | ||
e1a4e37c DW |
58 | /* |
59 | * While we're adjusting the refcounts records of an extent, we have | |
60 | * to keep an eye on the number of extents we're dirtying -- run too | |
61 | * many in a single transaction and we'll exceed the transaction's | |
62 | * reservation and crash the fs. Each record adds 12 bytes to the | |
63 | * log (plus any key updates) so we'll conservatively assume 32 bytes | |
64 | * per record. We must also leave space for btree splits on both ends | |
65 | * of the range and space for the CUD and a new CUI. | |
66 | */ | |
67 | #define XFS_REFCOUNT_ITEM_OVERHEAD 32 | |
68 | ||
69 | static inline xfs_fileoff_t xfs_refcount_max_unmap(int log_res) | |
70 | { | |
71 | return (log_res * 3 / 4) / XFS_REFCOUNT_ITEM_OVERHEAD; | |
72 | } | |
73 | ||
49db55ec DW |
74 | extern int xfs_refcount_has_record(struct xfs_btree_cur *cur, |
75 | xfs_agblock_t bno, xfs_extlen_t len, bool *exists); | |
7f8f1313 DW |
76 | union xfs_btree_rec; |
77 | extern void xfs_refcount_btrec_to_irec(union xfs_btree_rec *rec, | |
78 | struct xfs_refcount_irec *irec); | |
79 | extern int xfs_refcount_insert(struct xfs_btree_cur *cur, | |
80 | struct xfs_refcount_irec *irec, int *stat); | |
49db55ec | 81 | |
bdf28630 | 82 | #endif /* __XFS_REFCOUNT_H__ */ |