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1 : // SPDX-License-Identifier: GPL-2.0+
2 : /*
3 : * Copyright (C) 2016 Oracle. All Rights Reserved.
4 : * Author: Darrick J. Wong <darrick.wong@oracle.com>
5 : */
6 : #ifndef __XFS_REFCOUNT_H__
7 : #define __XFS_REFCOUNT_H__
8 :
9 : struct xfs_trans;
10 : struct xfs_mount;
11 : struct xfs_perag;
12 : struct xfs_btree_cur;
13 : struct xfs_bmbt_irec;
14 : struct xfs_refcount_irec;
15 : struct xfs_rtgroup;
16 :
17 : extern int xfs_refcount_lookup_le(struct xfs_btree_cur *cur,
18 : enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat);
19 : extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur,
20 : enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat);
21 : extern int xfs_refcount_lookup_eq(struct xfs_btree_cur *cur,
22 : enum xfs_refc_domain domain, xfs_agblock_t bno, int *stat);
23 : extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur,
24 : struct xfs_refcount_irec *irec, int *stat);
25 :
26 : static inline uint32_t
27 : xfs_refcount_encode_startblock(
28 : xfs_agblock_t startblock,
29 : enum xfs_refc_domain domain)
30 : {
31 50331996375 : uint32_t start;
32 :
33 : /*
34 : * low level btree operations need to handle the generic btree range
35 : * query functions (which set rc_domain == -1U), so we check that the
36 : * domain is /not/ shared.
37 : */
38 50331996375 : start = startblock & ~XFS_REFC_COWFLAG;
39 50331996375 : if (domain != XFS_REFC_DOMAIN_SHARED)
40 12123004282 : start |= XFS_REFC_COWFLAG;
41 :
42 50331996375 : return start;
43 : }
44 :
45 : enum xfs_refcount_intent_type {
46 : XFS_REFCOUNT_INCREASE = 1,
47 : XFS_REFCOUNT_DECREASE,
48 : XFS_REFCOUNT_ALLOC_COW,
49 : XFS_REFCOUNT_FREE_COW,
50 : };
51 :
52 : #define XFS_REFCOUNT_INTENT_STRINGS \
53 : { XFS_REFCOUNT_INCREASE, "incr" }, \
54 : { XFS_REFCOUNT_DECREASE, "decr" }, \
55 : { XFS_REFCOUNT_ALLOC_COW, "alloc_cow" }, \
56 : { XFS_REFCOUNT_FREE_COW, "free_cow" }
57 :
58 : struct xfs_refcount_intent {
59 : struct list_head ri_list;
60 : union {
61 : struct xfs_perag *ri_pag;
62 : struct xfs_rtgroup *ri_rtg;
63 : };
64 : enum xfs_refcount_intent_type ri_type;
65 : xfs_extlen_t ri_blockcount;
66 : xfs_fsblock_t ri_startblock;
67 : bool ri_realtime;
68 : };
69 :
70 : /* Check that the refcount is appropriate for the record domain. */
71 : static inline bool
72 4268229954 : xfs_refcount_check_domain(
73 : const struct xfs_refcount_irec *irec)
74 : {
75 4268229954 : if (irec->rc_domain == XFS_REFC_DOMAIN_COW && irec->rc_refcount != 1)
76 : return false;
77 4268229961 : if (irec->rc_domain == XFS_REFC_DOMAIN_SHARED && irec->rc_refcount < 2)
78 0 : return false;
79 : return true;
80 : }
81 :
82 : void xfs_refcount_update_get_group(struct xfs_mount *mp,
83 : struct xfs_refcount_intent *ri);
84 :
85 : void xfs_refcount_increase_extent(struct xfs_trans *tp, bool isrt,
86 : struct xfs_bmbt_irec *irec);
87 : void xfs_refcount_decrease_extent(struct xfs_trans *tp, bool isrt,
88 : struct xfs_bmbt_irec *irec);
89 :
90 : extern void xfs_refcount_finish_one_cleanup(struct xfs_trans *tp,
91 : struct xfs_btree_cur *rcur, int error);
92 : extern int xfs_refcount_finish_one(struct xfs_trans *tp,
93 : struct xfs_refcount_intent *ri, struct xfs_btree_cur **pcur);
94 :
95 : extern int xfs_refcount_find_shared(struct xfs_btree_cur *cur,
96 : xfs_agblock_t agbno, xfs_extlen_t aglen, xfs_agblock_t *fbno,
97 : xfs_extlen_t *flen, bool find_end_of_shared);
98 :
99 : void xfs_refcount_alloc_cow_extent(struct xfs_trans *tp, bool isrt,
100 : xfs_fsblock_t fsb, xfs_extlen_t len);
101 : void xfs_refcount_free_cow_extent(struct xfs_trans *tp, bool isrt,
102 : xfs_fsblock_t fsb, xfs_extlen_t len);
103 : int xfs_refcount_recover_cow_leftovers(struct xfs_mount *mp,
104 : struct xfs_perag *pag);
105 : int xfs_refcount_recover_rtcow_leftovers(struct xfs_mount *mp,
106 : struct xfs_rtgroup *rtg);
107 :
108 : /*
109 : * While we're adjusting the refcounts records of an extent, we have
110 : * to keep an eye on the number of extents we're dirtying -- run too
111 : * many in a single transaction and we'll exceed the transaction's
112 : * reservation and crash the fs. Each record adds 12 bytes to the
113 : * log (plus any key updates) so we'll conservatively assume 32 bytes
114 : * per record. We must also leave space for btree splits on both ends
115 : * of the range and space for the CUD and a new CUI.
116 : *
117 : * Each EFI that we attach to the transaction is assumed to consume ~32 bytes.
118 : * This is a low estimate for an EFI tracking a single extent (16 bytes for the
119 : * EFI header, 16 for the extent, and 12 for the xlog op header), but the
120 : * estimate is acceptable if there's more than one extent being freed.
121 : * In the worst case of freeing every other block during a refcount decrease
122 : * operation, we amortize the space used for one EFI log item across 16
123 : * extents.
124 : */
125 : #define XFS_REFCOUNT_ITEM_OVERHEAD 32
126 :
127 : extern int xfs_refcount_has_records(struct xfs_btree_cur *cur,
128 : enum xfs_refc_domain domain, xfs_agblock_t bno,
129 : xfs_extlen_t len, enum xbtree_recpacking *outcome);
130 : union xfs_btree_rec;
131 : extern void xfs_refcount_btrec_to_irec(const union xfs_btree_rec *rec,
132 : struct xfs_refcount_irec *irec);
133 : xfs_failaddr_t xfs_refcount_check_perag_irec(struct xfs_perag *pag,
134 : const struct xfs_refcount_irec *irec);
135 : xfs_failaddr_t xfs_refcount_check_rtgroup_irec(struct xfs_rtgroup *rtg,
136 : const struct xfs_refcount_irec *irec);
137 : xfs_failaddr_t xfs_refcount_check_irec(struct xfs_btree_cur *cur,
138 : const struct xfs_refcount_irec *irec);
139 : extern int xfs_refcount_insert(struct xfs_btree_cur *cur,
140 : struct xfs_refcount_irec *irec, int *stat);
141 :
142 : extern struct kmem_cache *xfs_refcount_intent_cache;
143 :
144 : int __init xfs_refcount_intent_init_cache(void);
145 : void xfs_refcount_intent_destroy_cache(void);
146 :
147 : typedef int (*xfs_refcount_query_range_fn)(
148 : struct xfs_btree_cur *cur,
149 : const struct xfs_refcount_irec *rec,
150 : void *priv);
151 :
152 : int xfs_refcount_query_range(struct xfs_btree_cur *cur,
153 : const struct xfs_refcount_irec *low_rec,
154 : const struct xfs_refcount_irec *high_rec,
155 : xfs_refcount_query_range_fn fn, void *priv);
156 :
157 : #endif /* __XFS_REFCOUNT_H__ */
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