1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BUCKETS_TYPES_H
3 #define _BUCKETS_TYPES_H
4 
5 #include "bcachefs_format.h"
6 #include "util.h"
7 
8 #define BUCKET_JOURNAL_SEQ_BITS		16
9 
10 /*
11  * Ugly hack alert:
12  *
13  * We need to cram a spinlock in a single byte, because that's what we have left
14  * in struct bucket, and we care about the size of these - during fsck, we need
15  * in memory state for every single bucket on every device.
16  *
17  * We used to do
18  *   while (xchg(&b->lock, 1) cpu_relax();
19  * but, it turns out not all architectures support xchg on a single byte.
20  *
21  * So now we use bit_spin_lock(), with fun games since we can't burn a whole
22  * ulong for this - we just need to make sure the lock bit always ends up in the
23  * first byte.
24  */
25 
26 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
27 #define BUCKET_LOCK_BITNR	0
28 #else
29 #define BUCKET_LOCK_BITNR	(BITS_PER_LONG - 1)
30 #endif
31 
32 union ulong_byte_assert {
33 	ulong	ulong;
34 	u8	byte;
35 };
36 
37 struct bucket {
38 	u8			lock;
39 	u8			gen_valid:1;
40 	u8			data_type:7;
41 	u8			gen;
42 	u8			stripe_redundancy;
43 	u32			stripe;
44 	u32			dirty_sectors;
45 	u32			cached_sectors;
46 	u32			stripe_sectors;
47 } __aligned(sizeof(long));
48 
49 struct bucket_gens {
50 	struct rcu_head		rcu;
51 	u16			first_bucket;
52 	size_t			nbuckets;
53 	size_t			nbuckets_minus_first;
54 	u8			b[] __counted_by(nbuckets);
55 };
56 
57 /* Only info on bucket countns: */
58 struct bch_dev_usage {
59 	u64			buckets[BCH_DATA_NR];
60 };
61 
62 struct bch_dev_usage_full {
63 	struct bch_dev_usage_type {
64 		u64		buckets;
65 		u64		sectors; /* _compressed_ sectors: */
66 		/*
67 		 * XXX
68 		 * Why do we have this? Isn't it just buckets * bucket_size -
69 		 * sectors?
70 		 */
71 		u64		fragmented;
72 	}			d[BCH_DATA_NR];
73 };
74 
75 struct bch_fs_usage_base {
76 	u64			hidden;
77 	u64			btree;
78 	u64			data;
79 	u64			cached;
80 	u64			reserved;
81 	u64			nr_inodes;
82 };
83 
84 struct bch_fs_usage_short {
85 	u64			capacity;
86 	u64			used;
87 	u64			free;
88 	u64			nr_inodes;
89 };
90 
91 /*
92  * A reservation for space on disk:
93  */
94 struct disk_reservation {
95 	u64			sectors;
96 	u32			gen;
97 	unsigned		nr_replicas;
98 };
99 
100 #endif /* _BUCKETS_TYPES_H */
101