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
9 enum bch_validate_flags;
10
11 int bch2_stripe_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags);
12 void bch2_stripe_to_text(struct printbuf *, struct bch_fs *,
13 struct bkey_s_c);
14 int bch2_trigger_stripe(struct btree_trans *, enum btree_id, unsigned,
15 struct bkey_s_c, struct bkey_s,
16 enum btree_iter_update_trigger_flags);
17
18 #define bch2_bkey_ops_stripe ((struct bkey_ops) { \
19 .key_validate = bch2_stripe_validate, \
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
26 static 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
32 static 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
44 static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
45 unsigned idx)
46 {
47 return stripe_csum_offset(s, s->nr_blocks, 0) +
48 sizeof(u16) * idx;
49 }
50
51 static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
52 unsigned idx)
53 {
54 return le16_to_cpup((void *) s + stripe_blockcount_offset(s, idx));
55 }
56
57 static 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
65 static 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
71 static 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, block, csum_idx);
78 }
79
80 static 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
89 static 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
96 static 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->dev == BCH_SB_MEMBER_INVALID ||
102 stripe_ptr->dev == BCH_SB_MEMBER_INVALID) &&
103 data_ptr->gen == stripe_ptr->gen &&
104 data_ptr->offset >= stripe_ptr->offset &&
105 data_ptr->offset < stripe_ptr->offset + sectors;
106 }
107
108 static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
109 struct extent_ptr_decoded p)
110 {
111 unsigned nr_data = s->nr_blocks - s->nr_redundant;
112
113 BUG_ON(!p.has_ec);
114
115 if (p.ec.block >= nr_data)
116 return false;
117
118 return __bch2_ptr_matches_stripe(&s->ptrs[p.ec.block], &p.ptr,
119 le16_to_cpu(s->sectors));
120 }
121
122 static inline bool bch2_ptr_matches_stripe_m(const struct gc_stripe *m,
123 struct extent_ptr_decoded p)
124 {
125 unsigned nr_data = m->nr_blocks - m->nr_redundant;
126
127 BUG_ON(!p.has_ec);
128
129 if (p.ec.block >= nr_data)
130 return false;
131
132 return __bch2_ptr_matches_stripe(&m->ptrs[p.ec.block], &p.ptr,
133 m->sectors);
134 }
135
136 struct bch_read_bio;
137
138 struct ec_stripe_buf {
139 /* might not be buffering the entire stripe: */
140 unsigned offset;
141 unsigned size;
142 unsigned long valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
143
144 void *data[BCH_BKEY_PTRS_MAX];
145
146 __BKEY_PADDED(key, 255);
147 };
148
149 struct ec_stripe_head;
150
151 enum ec_stripe_ref {
152 STRIPE_REF_io,
153 STRIPE_REF_stripe,
154 STRIPE_REF_NR
155 };
156
157 struct ec_stripe_new {
158 struct bch_fs *c;
159 struct ec_stripe_head *h;
160 struct mutex lock;
161 struct list_head list;
162
163 struct hlist_node hash;
164 u64 idx;
165
166 struct closure iodone;
167
168 atomic_t ref[STRIPE_REF_NR];
169
170 int err;
171
172 u8 nr_data;
173 u8 nr_parity;
174 bool allocated;
175 bool pending;
176 bool have_existing_stripe;
177
178 unsigned long blocks_gotten[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
179 unsigned long blocks_allocated[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
180 open_bucket_idx_t blocks[BCH_BKEY_PTRS_MAX];
181 struct disk_reservation res;
182
183 struct ec_stripe_buf new_stripe;
184 struct ec_stripe_buf existing_stripe;
185 };
186
187 struct ec_stripe_head {
188 struct list_head list;
189 struct mutex lock;
190
191 unsigned target;
192 unsigned algo;
193 unsigned redundancy;
194 enum bch_watermark watermark;
195
196 struct bch_devs_mask devs;
197 unsigned nr_active_devs;
198
199 unsigned blocksize;
200
201 struct dev_stripe_state block_stripe;
202 struct dev_stripe_state parity_stripe;
203
204 struct ec_stripe_new *s;
205 };
206
207 int bch2_ec_read_extent(struct btree_trans *, struct bch_read_bio *);
208
209 void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
210
211 void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
212
213 int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
214
215 void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
216 struct ec_stripe_head *bch2_ec_stripe_head_get(struct btree_trans *,
217 unsigned, unsigned, unsigned,
218 enum bch_watermark, struct closure *);
219
220 void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
221 void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
222 void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
223
224 void bch2_do_stripe_deletes(struct bch_fs *);
225 void bch2_ec_do_stripe_creates(struct bch_fs *);
226 void bch2_ec_stripe_new_free(struct bch_fs *, struct ec_stripe_new *);
227
228 static inline void ec_stripe_new_get(struct ec_stripe_new *s,
229 enum ec_stripe_ref ref)
230 {
231 atomic_inc(&s->ref[ref]);
232 }
233
234 static inline void ec_stripe_new_put(struct bch_fs *c, struct ec_stripe_new *s,
235 enum ec_stripe_ref ref)
236 {
237 BUG_ON(atomic_read(&s->ref[ref]) <= 0);
238
239 if (atomic_dec_and_test(&s->ref[ref]))
240 switch (ref) {
241 case STRIPE_REF_stripe:
242 bch2_ec_stripe_new_free(c, s);
243 break;
244 case STRIPE_REF_io:
245 bch2_ec_do_stripe_creates(c);
246 break;
247 default:
248 BUG();
249 }
250 }
251
252 void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
253 void bch2_fs_ec_stop(struct bch_fs *);
254 void bch2_fs_ec_flush(struct bch_fs *);
255
256 int bch2_stripes_read(struct bch_fs *);
257
258 void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
259 void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
260
261 void bch2_fs_ec_exit(struct bch_fs *);
262 void bch2_fs_ec_init_early(struct bch_fs *);
263 int bch2_fs_ec_init(struct bch_fs *);
264
265 #endif /* _BCACHEFS_EC_H */
266
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