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 EBUG_ON(s->csum_type >= BCH_CSUM_NR);
36
37 unsigned csum_bytes = bch_crc_bytes[s->csum_type];
38
39 return sizeof(struct bch_stripe) +
40 sizeof(struct bch_extent_ptr) * s->nr_blocks +
41 (dev * stripe_csums_per_device(s) + csum_idx) * csum_bytes;
42}
43
44static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
45 unsigned idx)
46{
47 return stripe_csum_offset(s, dev: s->nr_blocks, csum_idx: 0) +
48 sizeof(u16) * idx;
49}
50
51static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
52 unsigned idx)
53{
54 return le16_to_cpup(p: (void *) s + stripe_blockcount_offset(s, idx));
55}
56
57static inline void stripe_blockcount_set(struct bch_stripe *s,
58 unsigned idx, unsigned v)
59{
60 __le16 *p = (void *) s + stripe_blockcount_offset(s, idx);
61
62 *p = cpu_to_le16(v);
63}
64
65static inline unsigned stripe_val_u64s(const struct bch_stripe *s)
66{
67 return DIV_ROUND_UP(stripe_blockcount_offset(s, s->nr_blocks),
68 sizeof(u64));
69}
70
71static inline void *stripe_csum(struct bch_stripe *s,
72 unsigned block, unsigned csum_idx)
73{
74 EBUG_ON(block >= s->nr_blocks);
75 EBUG_ON(csum_idx >= stripe_csums_per_device(s));
76
77 return (void *) s + stripe_csum_offset(s, dev: block, csum_idx);
78}
79
80static inline struct bch_csum stripe_csum_get(struct bch_stripe *s,
81 unsigned block, unsigned csum_idx)
82{
83 struct bch_csum csum = { 0 };
84
85 memcpy(&csum, stripe_csum(s, block, csum_idx), bch_crc_bytes[s->csum_type]);
86 return csum;
87}
88
89static inline void stripe_csum_set(struct bch_stripe *s,
90 unsigned block, unsigned csum_idx,
91 struct bch_csum csum)
92{
93 memcpy(stripe_csum(s, block, csum_idx), &csum, bch_crc_bytes[s->csum_type]);
94}
95
96static inline bool __bch2_ptr_matches_stripe(const struct bch_extent_ptr *stripe_ptr,
97 const struct bch_extent_ptr *data_ptr,
98 unsigned sectors)
99{
100 return data_ptr->dev == stripe_ptr->dev &&
101 data_ptr->gen == stripe_ptr->gen &&
102 data_ptr->offset >= stripe_ptr->offset &&
103 data_ptr->offset < stripe_ptr->offset + sectors;
104}
105
106static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
107 struct extent_ptr_decoded p)
108{
109 unsigned nr_data = s->nr_blocks - s->nr_redundant;
110
111 BUG_ON(!p.has_ec);
112
113 if (p.ec.block >= nr_data)
114 return false;
115
116 return __bch2_ptr_matches_stripe(stripe_ptr: &s->ptrs[p.ec.block], data_ptr: &p.ptr,
117 le16_to_cpu(s->sectors));
118}
119
120static inline bool bch2_ptr_matches_stripe_m(const struct gc_stripe *m,
121 struct extent_ptr_decoded p)
122{
123 unsigned nr_data = m->nr_blocks - m->nr_redundant;
124
125 BUG_ON(!p.has_ec);
126
127 if (p.ec.block >= nr_data)
128 return false;
129
130 return __bch2_ptr_matches_stripe(stripe_ptr: &m->ptrs[p.ec.block], data_ptr: &p.ptr,
131 sectors: m->sectors);
132}
133
134struct bch_read_bio;
135
136struct ec_stripe_buf {
137 /* might not be buffering the entire stripe: */
138 unsigned offset;
139 unsigned size;
140 unsigned long valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
141
142 void *data[BCH_BKEY_PTRS_MAX];
143
144 __BKEY_PADDED(key, 255);
145};
146
147struct ec_stripe_head;
148
149enum ec_stripe_ref {
150 STRIPE_REF_io,
151 STRIPE_REF_stripe,
152 STRIPE_REF_NR
153};
154
155struct ec_stripe_new {
156 struct bch_fs *c;
157 struct ec_stripe_head *h;
158 struct mutex lock;
159 struct list_head list;
160
161 struct hlist_node hash;
162 u64 idx;
163
164 struct closure iodone;
165
166 atomic_t ref[STRIPE_REF_NR];
167
168 int err;
169
170 u8 nr_data;
171 u8 nr_parity;
172 bool allocated;
173 bool pending;
174 bool have_existing_stripe;
175
176 unsigned long blocks_gotten[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
177 unsigned long blocks_allocated[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
178 open_bucket_idx_t blocks[BCH_BKEY_PTRS_MAX];
179 struct disk_reservation res;
180
181 struct ec_stripe_buf new_stripe;
182 struct ec_stripe_buf existing_stripe;
183};
184
185struct ec_stripe_head {
186 struct list_head list;
187 struct mutex lock;
188
189 unsigned target;
190 unsigned algo;
191 unsigned redundancy;
192 enum bch_watermark watermark;
193
194 struct bch_devs_mask devs;
195 unsigned nr_active_devs;
196
197 unsigned blocksize;
198
199 struct dev_stripe_state block_stripe;
200 struct dev_stripe_state parity_stripe;
201
202 struct ec_stripe_new *s;
203};
204
205int bch2_ec_read_extent(struct btree_trans *, struct bch_read_bio *);
206
207void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
208
209void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
210
211int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
212
213void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
214struct ec_stripe_head *bch2_ec_stripe_head_get(struct btree_trans *,
215 unsigned, unsigned, unsigned,
216 enum bch_watermark, struct closure *);
217
218void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
219void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
220void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
221
222void bch2_do_stripe_deletes(struct bch_fs *);
223void bch2_ec_do_stripe_creates(struct bch_fs *);
224void bch2_ec_stripe_new_free(struct bch_fs *, struct ec_stripe_new *);
225
226static inline void ec_stripe_new_get(struct ec_stripe_new *s,
227 enum ec_stripe_ref ref)
228{
229 atomic_inc(v: &s->ref[ref]);
230}
231
232static inline void ec_stripe_new_put(struct bch_fs *c, struct ec_stripe_new *s,
233 enum ec_stripe_ref ref)
234{
235 BUG_ON(atomic_read(&s->ref[ref]) <= 0);
236
237 if (atomic_dec_and_test(v: &s->ref[ref]))
238 switch (ref) {
239 case STRIPE_REF_stripe:
240 bch2_ec_stripe_new_free(c, s);
241 break;
242 case STRIPE_REF_io:
243 bch2_ec_do_stripe_creates(c);
244 break;
245 default:
246 BUG();
247 }
248}
249
250void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
251void bch2_fs_ec_stop(struct bch_fs *);
252void bch2_fs_ec_flush(struct bch_fs *);
253
254int bch2_stripes_read(struct bch_fs *);
255
256void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
257void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
258
259void bch2_fs_ec_exit(struct bch_fs *);
260void bch2_fs_ec_init_early(struct bch_fs *);
261int bch2_fs_ec_init(struct bch_fs *);
262
263#endif /* _BCACHEFS_EC_H */
264

source code of linux/fs/bcachefs/ec.h