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 int bch2_stripe_validate(struct bch_fs *, struct bkey_s_c,
10 struct bkey_validate_context);
11 void bch2_stripe_to_text(struct printbuf *, struct bch_fs *,
12 struct bkey_s_c);
13 int bch2_trigger_stripe(struct btree_trans *, enum btree_id, unsigned,
14 struct bkey_s_c, struct bkey_s,
15 enum btree_iter_update_trigger_flags);
16
17 #define bch2_bkey_ops_stripe ((struct bkey_ops) { \
18 .key_validate = bch2_stripe_validate, \
19 .val_to_text = bch2_stripe_to_text, \
20 .swab = bch2_ptr_swab, \
21 .trigger = bch2_trigger_stripe, \
22 .min_val_size = 8, \
23 })
24
stripe_csums_per_device(const struct bch_stripe * s)25 static inline unsigned stripe_csums_per_device(const struct bch_stripe *s)
26 {
27 return DIV_ROUND_UP(le16_to_cpu(s->sectors),
28 1 << s->csum_granularity_bits);
29 }
30
stripe_csum_offset(const struct bch_stripe * s,unsigned dev,unsigned csum_idx)31 static inline unsigned stripe_csum_offset(const struct bch_stripe *s,
32 unsigned dev, unsigned csum_idx)
33 {
34 EBUG_ON(s->csum_type >= BCH_CSUM_NR);
35
36 unsigned csum_bytes = bch_crc_bytes[s->csum_type];
37
38 return sizeof(struct bch_stripe) +
39 sizeof(struct bch_extent_ptr) * s->nr_blocks +
40 (dev * stripe_csums_per_device(s) + csum_idx) * csum_bytes;
41 }
42
stripe_blockcount_offset(const struct bch_stripe * s,unsigned idx)43 static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
44 unsigned idx)
45 {
46 return stripe_csum_offset(s, s->nr_blocks, 0) +
47 sizeof(u16) * idx;
48 }
49
stripe_blockcount_get(const struct bch_stripe * s,unsigned idx)50 static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
51 unsigned idx)
52 {
53 return le16_to_cpup((void *) s + stripe_blockcount_offset(s, idx));
54 }
55
stripe_blockcount_set(struct bch_stripe * s,unsigned idx,unsigned v)56 static inline void stripe_blockcount_set(struct bch_stripe *s,
57 unsigned idx, unsigned v)
58 {
59 __le16 *p = (void *) s + stripe_blockcount_offset(s, idx);
60
61 *p = cpu_to_le16(v);
62 }
63
stripe_val_u64s(const struct bch_stripe * s)64 static inline unsigned stripe_val_u64s(const struct bch_stripe *s)
65 {
66 return DIV_ROUND_UP(stripe_blockcount_offset(s, s->nr_blocks),
67 sizeof(u64));
68 }
69
stripe_csum(struct bch_stripe * s,unsigned block,unsigned csum_idx)70 static inline void *stripe_csum(struct bch_stripe *s,
71 unsigned block, unsigned csum_idx)
72 {
73 EBUG_ON(block >= s->nr_blocks);
74 EBUG_ON(csum_idx >= stripe_csums_per_device(s));
75
76 return (void *) s + stripe_csum_offset(s, block, csum_idx);
77 }
78
stripe_csum_get(struct bch_stripe * s,unsigned block,unsigned csum_idx)79 static inline struct bch_csum stripe_csum_get(struct bch_stripe *s,
80 unsigned block, unsigned csum_idx)
81 {
82 struct bch_csum csum = { 0 };
83
84 memcpy(&csum, stripe_csum(s, block, csum_idx), bch_crc_bytes[s->csum_type]);
85 return csum;
86 }
87
stripe_csum_set(struct bch_stripe * s,unsigned block,unsigned csum_idx,struct bch_csum csum)88 static inline void stripe_csum_set(struct bch_stripe *s,
89 unsigned block, unsigned csum_idx,
90 struct bch_csum csum)
91 {
92 memcpy(stripe_csum(s, block, csum_idx), &csum, bch_crc_bytes[s->csum_type]);
93 }
94
__bch2_ptr_matches_stripe(const struct bch_extent_ptr * stripe_ptr,const struct bch_extent_ptr * data_ptr,unsigned sectors)95 static inline bool __bch2_ptr_matches_stripe(const struct bch_extent_ptr *stripe_ptr,
96 const struct bch_extent_ptr *data_ptr,
97 unsigned sectors)
98 {
99 return (data_ptr->dev == stripe_ptr->dev ||
100 data_ptr->dev == BCH_SB_MEMBER_INVALID ||
101 stripe_ptr->dev == BCH_SB_MEMBER_INVALID) &&
102 data_ptr->gen == stripe_ptr->gen &&
103 data_ptr->offset >= stripe_ptr->offset &&
104 data_ptr->offset < stripe_ptr->offset + sectors;
105 }
106
bch2_ptr_matches_stripe(const struct bch_stripe * s,struct extent_ptr_decoded p)107 static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
108 struct extent_ptr_decoded p)
109 {
110 unsigned nr_data = s->nr_blocks - s->nr_redundant;
111
112 BUG_ON(!p.has_ec);
113
114 if (p.ec.block >= nr_data)
115 return false;
116
117 return __bch2_ptr_matches_stripe(&s->ptrs[p.ec.block], &p.ptr,
118 le16_to_cpu(s->sectors));
119 }
120
bch2_ptr_matches_stripe_m(const struct gc_stripe * m,struct extent_ptr_decoded p)121 static inline bool bch2_ptr_matches_stripe_m(const struct gc_stripe *m,
122 struct extent_ptr_decoded p)
123 {
124 unsigned nr_data = m->nr_blocks - m->nr_redundant;
125
126 BUG_ON(!p.has_ec);
127
128 if (p.ec.block >= nr_data)
129 return false;
130
131 return __bch2_ptr_matches_stripe(&m->ptrs[p.ec.block], &p.ptr,
132 m->sectors);
133 }
134
135 struct bch_read_bio;
136
137 struct ec_stripe_buf {
138 /* might not be buffering the entire stripe: */
139 unsigned offset;
140 unsigned size;
141 unsigned long valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
142
143 void *data[BCH_BKEY_PTRS_MAX];
144
145 __BKEY_PADDED(key, 255);
146 };
147
148 struct ec_stripe_head;
149
150 enum ec_stripe_ref {
151 STRIPE_REF_io,
152 STRIPE_REF_stripe,
153 STRIPE_REF_NR
154 };
155
156 struct ec_stripe_new {
157 struct bch_fs *c;
158 struct ec_stripe_head *h;
159 struct mutex lock;
160 struct list_head list;
161
162 struct hlist_node hash;
163 u64 idx;
164
165 struct closure iodone;
166
167 atomic_t ref[STRIPE_REF_NR];
168
169 int err;
170
171 u8 nr_data;
172 u8 nr_parity;
173 bool allocated;
174 bool pending;
175 bool have_existing_stripe;
176
177 unsigned long blocks_gotten[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
178 unsigned long blocks_allocated[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
179 open_bucket_idx_t blocks[BCH_BKEY_PTRS_MAX];
180 struct disk_reservation res;
181
182 struct ec_stripe_buf new_stripe;
183 struct ec_stripe_buf existing_stripe;
184 };
185
186 struct ec_stripe_head {
187 struct list_head list;
188 struct mutex lock;
189
190 unsigned disk_label;
191 unsigned algo;
192 unsigned redundancy;
193 enum bch_watermark watermark;
194 bool insufficient_devs;
195
196 unsigned long rw_devs_change_count;
197
198 u64 nr_created;
199
200 struct bch_devs_mask devs;
201 unsigned nr_active_devs;
202
203 unsigned blocksize;
204
205 struct dev_stripe_state block_stripe;
206 struct dev_stripe_state parity_stripe;
207
208 struct ec_stripe_new *s;
209 };
210
211 int bch2_ec_read_extent(struct btree_trans *, struct bch_read_bio *, struct bkey_s_c);
212
213 void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
214
215 void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
216
217 int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
218
219 void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
220 struct ec_stripe_head *bch2_ec_stripe_head_get(struct btree_trans *,
221 unsigned, unsigned, unsigned,
222 enum bch_watermark, struct closure *);
223
224 void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
225 void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
226 void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
227
228 void bch2_do_stripe_deletes(struct bch_fs *);
229 void bch2_ec_do_stripe_creates(struct bch_fs *);
230 void bch2_ec_stripe_new_free(struct bch_fs *, struct ec_stripe_new *);
231
ec_stripe_new_get(struct ec_stripe_new * s,enum ec_stripe_ref ref)232 static inline void ec_stripe_new_get(struct ec_stripe_new *s,
233 enum ec_stripe_ref ref)
234 {
235 atomic_inc(&s->ref[ref]);
236 }
237
ec_stripe_new_put(struct bch_fs * c,struct ec_stripe_new * s,enum ec_stripe_ref ref)238 static inline void ec_stripe_new_put(struct bch_fs *c, struct ec_stripe_new *s,
239 enum ec_stripe_ref ref)
240 {
241 BUG_ON(atomic_read(&s->ref[ref]) <= 0);
242
243 if (atomic_dec_and_test(&s->ref[ref]))
244 switch (ref) {
245 case STRIPE_REF_stripe:
246 bch2_ec_stripe_new_free(c, s);
247 break;
248 case STRIPE_REF_io:
249 bch2_ec_do_stripe_creates(c);
250 break;
251 default:
252 BUG();
253 }
254 }
255
256 int bch2_dev_remove_stripes(struct bch_fs *, unsigned);
257
258 void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
259 void bch2_fs_ec_stop(struct bch_fs *);
260 void bch2_fs_ec_flush(struct bch_fs *);
261
262 int bch2_stripes_read(struct bch_fs *);
263
264 void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
265 void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
266
267 void bch2_fs_ec_exit(struct bch_fs *);
268 void bch2_fs_ec_init_early(struct bch_fs *);
269 int bch2_fs_ec_init(struct bch_fs *);
270
271 #endif /* _BCACHEFS_EC_H */
272