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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _BCACHEFS_EC_H
3#define _BCACHEFS_EC_H
4
5#include "ec_types.h"
6#include "buckets_types.h"
7#include "extents_types.h"
8
9enum bkey_invalid_flags;
10
11int bch2_stripe_invalid(struct bch_fs *, struct bkey_s_c,
12 enum bkey_invalid_flags, struct printbuf *);
13void bch2_stripe_to_text(struct printbuf *, struct bch_fs *,
14 struct bkey_s_c);
15int bch2_trigger_stripe(struct btree_trans *, enum btree_id, unsigned,
16 struct bkey_s_c, struct bkey_s, unsigned);
17
18#define bch2_bkey_ops_stripe ((struct bkey_ops) { \
19 .key_invalid = bch2_stripe_invalid, \
20 .val_to_text = bch2_stripe_to_text, \
21 .swab = bch2_ptr_swab, \
22 .trigger = bch2_trigger_stripe, \
23 .min_val_size = 8, \
24})
25
26static inline unsigned stripe_csums_per_device(const struct bch_stripe *s)
27{
28 return DIV_ROUND_UP(le16_to_cpu(s->sectors),
29 1 << s->csum_granularity_bits);
30}
31
32static inline unsigned stripe_csum_offset(const struct bch_stripe *s,
33 unsigned dev, unsigned csum_idx)
34{
35 unsigned csum_bytes = bch_crc_bytes[s->csum_type];
36
37 return sizeof(struct bch_stripe) +
38 sizeof(struct bch_extent_ptr) * s->nr_blocks +
39 (dev * stripe_csums_per_device(s) + csum_idx) * csum_bytes;
40}
41
42static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
43 unsigned idx)
44{
45 return stripe_csum_offset(s, s->nr_blocks, 0) +
46 sizeof(u16) * idx;
47}
48
49static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
50 unsigned idx)
51{
52 return le16_to_cpup((void *) s + stripe_blockcount_offset(s, idx));
53}
54
55static inline void stripe_blockcount_set(struct bch_stripe *s,
56 unsigned idx, unsigned v)
57{
58 __le16 *p = (void *) s + stripe_blockcount_offset(s, idx);
59
60 *p = cpu_to_le16(v);
61}
62
63static inline unsigned stripe_val_u64s(const struct bch_stripe *s)
64{
65 return DIV_ROUND_UP(stripe_blockcount_offset(s, s->nr_blocks),
66 sizeof(u64));
67}
68
69static inline void *stripe_csum(struct bch_stripe *s,
70 unsigned block, unsigned csum_idx)
71{
72 EBUG_ON(block >= s->nr_blocks);
73 EBUG_ON(csum_idx >= stripe_csums_per_device(s));
74
75 return (void *) s + stripe_csum_offset(s, block, csum_idx);
76}
77
78static inline struct bch_csum stripe_csum_get(struct bch_stripe *s,
79 unsigned block, unsigned csum_idx)
80{
81 struct bch_csum csum = { 0 };
82
83 memcpy(&csum, stripe_csum(s, block, csum_idx), bch_crc_bytes[s->csum_type]);
84 return csum;
85}
86
87static inline void stripe_csum_set(struct bch_stripe *s,
88 unsigned block, unsigned csum_idx,
89 struct bch_csum csum)
90{
91 memcpy(stripe_csum(s, block, csum_idx), &csum, bch_crc_bytes[s->csum_type]);
92}
93
94static inline bool __bch2_ptr_matches_stripe(const struct bch_extent_ptr *stripe_ptr,
95 const struct bch_extent_ptr *data_ptr,
96 unsigned sectors)
97{
98 return data_ptr->dev == stripe_ptr->dev &&
99 data_ptr->gen == stripe_ptr->gen &&
100 data_ptr->offset >= stripe_ptr->offset &&
101 data_ptr->offset < stripe_ptr->offset + sectors;
102}
103
104static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
105 struct extent_ptr_decoded p)
106{
107 unsigned nr_data = s->nr_blocks - s->nr_redundant;
108
109 BUG_ON(!p.has_ec);
110
111 if (p.ec.block >= nr_data)
112 return false;
113
114 return __bch2_ptr_matches_stripe(&s->ptrs[p.ec.block], &p.ptr,
115 le16_to_cpu(s->sectors));
116}
117
118static inline bool bch2_ptr_matches_stripe_m(const struct gc_stripe *m,
119 struct extent_ptr_decoded p)
120{
121 unsigned nr_data = m->nr_blocks - m->nr_redundant;
122
123 BUG_ON(!p.has_ec);
124
125 if (p.ec.block >= nr_data)
126 return false;
127
128 return __bch2_ptr_matches_stripe(&m->ptrs[p.ec.block], &p.ptr,
129 m->sectors);
130}
131
132struct bch_read_bio;
133
134struct ec_stripe_buf {
135 /* might not be buffering the entire stripe: */
136 unsigned offset;
137 unsigned size;
138 unsigned long valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
139
140 void *data[BCH_BKEY_PTRS_MAX];
141
142 __BKEY_PADDED(key, 255);
143};
144
145struct ec_stripe_head;
146
147enum ec_stripe_ref {
148 STRIPE_REF_io,
149 STRIPE_REF_stripe,
150 STRIPE_REF_NR
151};
152
153struct ec_stripe_new {
154 struct bch_fs *c;
155 struct ec_stripe_head *h;
156 struct mutex lock;
157 struct list_head list;
158
159 struct hlist_node hash;
160 u64 idx;
161
162 struct closure iodone;
163
164 atomic_t ref[STRIPE_REF_NR];
165
166 int err;
167
168 u8 nr_data;
169 u8 nr_parity;
170 bool allocated;
171 bool pending;
172 bool have_existing_stripe;
173
174 unsigned long blocks_gotten[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
175 unsigned long blocks_allocated[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
176 open_bucket_idx_t blocks[BCH_BKEY_PTRS_MAX];
177 struct disk_reservation res;
178
179 struct ec_stripe_buf new_stripe;
180 struct ec_stripe_buf existing_stripe;
181};
182
183struct ec_stripe_head {
184 struct list_head list;
185 struct mutex lock;
186
187 unsigned target;
188 unsigned algo;
189 unsigned redundancy;
190 enum bch_watermark watermark;
191
192 struct bch_devs_mask devs;
193 unsigned nr_active_devs;
194
195 unsigned blocksize;
196
197 struct dev_stripe_state block_stripe;
198 struct dev_stripe_state parity_stripe;
199
200 struct ec_stripe_new *s;
201};
202
203int bch2_ec_read_extent(struct btree_trans *, struct bch_read_bio *);
204
205void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
206
207void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
208
209int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
210
211void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
212struct ec_stripe_head *bch2_ec_stripe_head_get(struct btree_trans *,
213 unsigned, unsigned, unsigned,
214 enum bch_watermark, struct closure *);
215
216void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
217void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
218void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
219
220void bch2_do_stripe_deletes(struct bch_fs *);
221void bch2_ec_do_stripe_creates(struct bch_fs *);
222void bch2_ec_stripe_new_free(struct bch_fs *, struct ec_stripe_new *);
223
224static inline void ec_stripe_new_get(struct ec_stripe_new *s,
225 enum ec_stripe_ref ref)
226{
227 atomic_inc(&s->ref[ref]);
228}
229
230static inline void ec_stripe_new_put(struct bch_fs *c, struct ec_stripe_new *s,
231 enum ec_stripe_ref ref)
232{
233 BUG_ON(atomic_read(&s->ref[ref]) <= 0);
234
235 if (atomic_dec_and_test(&s->ref[ref]))
236 switch (ref) {
237 case STRIPE_REF_stripe:
238 bch2_ec_stripe_new_free(c, s);
239 break;
240 case STRIPE_REF_io:
241 bch2_ec_do_stripe_creates(c);
242 break;
243 default:
244 BUG();
245 }
246}
247
248void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
249void bch2_fs_ec_stop(struct bch_fs *);
250void bch2_fs_ec_flush(struct bch_fs *);
251
252int bch2_stripes_read(struct bch_fs *);
253
254void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
255void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
256
257void bch2_fs_ec_exit(struct bch_fs *);
258void bch2_fs_ec_init_early(struct bch_fs *);
259int bch2_fs_ec_init(struct bch_fs *);
260
261#endif /* _BCACHEFS_EC_H */