]>
Commit | Line | Data |
---|---|---|
bc859611 DW |
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_H__ | |
21 | #define __XFS_REFCOUNT_H__ | |
22 | ||
23 | extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur, | |
24 | xfs_agblock_t bno, int *stat); | |
25 | extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur, | |
26 | xfs_agblock_t bno, int *stat); | |
27 | extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur, | |
28 | struct xfs_refcount_irec *irec, int *stat); | |
29 | ||
c1ea4010 DW |
30 | enum xfs_refcount_intent_type { |
31 | XFS_REFCOUNT_INCREASE = 1, | |
32 | XFS_REFCOUNT_DECREASE, | |
33 | XFS_REFCOUNT_ALLOC_COW, | |
34 | XFS_REFCOUNT_FREE_COW, | |
35 | }; | |
36 | ||
37 | struct xfs_refcount_intent { | |
38 | struct list_head ri_list; | |
39 | enum xfs_refcount_intent_type ri_type; | |
40 | xfs_fsblock_t ri_startblock; | |
41 | xfs_extlen_t ri_blockcount; | |
42 | }; | |
43 | ||
23a15a6c DW |
44 | extern int xfs_refcount_increase_extent(struct xfs_mount *mp, |
45 | struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec); | |
46 | extern int xfs_refcount_decrease_extent(struct xfs_mount *mp, | |
47 | struct xfs_defer_ops *dfops, struct xfs_bmbt_irec *irec); | |
48 | ||
49 | extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp, | |
50 | struct xfs_btree_cur *rcur, int error); | |
51 | extern int xfs_refcount_finish_one(struct xfs_trans *tp, | |
52 | struct xfs_defer_ops *dfops, enum xfs_refcount_intent_type type, | |
53 | xfs_fsblock_t startblock, xfs_extlen_t blockcount, | |
54 | xfs_fsblock_t *new_fsb, xfs_extlen_t *new_len, | |
55 | struct xfs_btree_cur **pcur); | |
56 | ||
94097330 DW |
57 | extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur, |
58 | xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno, | |
59 | xfs_extlen_t *flen, bool find_end_of_shared); | |
60 | ||
10e65503 DW |
61 | extern int xfs_refcount_alloc_cow_extent(struct xfs_mount *mp, |
62 | struct xfs_defer_ops *dfops, xfs_fsblock_t fsb, | |
63 | xfs_extlen_t len); | |
64 | extern int xfs_refcount_free_cow_extent(struct xfs_mount *mp, | |
65 | struct xfs_defer_ops *dfops, xfs_fsblock_t fsb, | |
66 | xfs_extlen_t len); | |
67 | extern int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp, | |
68 | xfs_agnumber_t agno); | |
69 | ||
594956fa DW |
70 | /* |
71 | * While we're adjusting the refcounts records of an extent, we have | |
72 | * to keep an eye on the number of extents we're dirtying -- run too | |
73 | * many in a single transaction and we'll exceed the transaction's | |
74 | * reservation and crash the fs. Each record adds 12 bytes to the | |
75 | * log (plus any key updates) so we'll conservatively assume 32 bytes | |
76 | * per record. We must also leave space for btree splits on both ends | |
77 | * of the range and space for the CUD and a new CUI. | |
78 | */ | |
79 | #define XFS_REFCOUNT_ITEM_OVERHEAD 32 | |
80 | ||
81 | static inline xfs_fileoff_t xfs_refcount_max_unmap(int log_res) | |
82 | { | |
83 | return (log_res * 3 / 4) / XFS_REFCOUNT_ITEM_OVERHEAD; | |
84 | } | |
85 | ||
1048d0e2 DW |
86 | extern int xfs_refcount_has_record(struct xfs_btree_cur *cur, |
87 | xfs_agblock_t bno, xfs_extlen_t len, bool *exists); | |
88 | ||
bc859611 | 89 | #endif /* __XFS_REFCOUNT_H__ */ |