git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/ec.h

   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
   8 int bch2_stripe_invalid(const struct bch_fs *, struct bkey_s_c,
   9                         int rw, struct printbuf *);
  10 void bch2_stripe_to_text(struct printbuf *, struct bch_fs *,
  11                          struct bkey_s_c);
  12
  13 #define bch2_bkey_ops_stripe ((struct bkey_ops) {       \
  14         .key_invalid    = bch2_stripe_invalid,          \
  15         .val_to_text    = bch2_stripe_to_text,          \
  16         .swab           = bch2_ptr_swab,                \
  17         .trans_trigger  = bch2_trans_mark_stripe,       \
  18         .atomic_trigger = bch2_mark_stripe,             \
  19 })
  20
  21 static inline unsigned stripe_csums_per_device(const struct bch_stripe *s)
  22 {
  23         return DIV_ROUND_UP(le16_to_cpu(s->sectors),
  24                             1 << s->csum_granularity_bits);
  25 }
  26
  27 static inline unsigned stripe_csum_offset(const struct bch_stripe *s,
  28                                           unsigned dev, unsigned csum_idx)
  29 {
  30         unsigned csum_bytes = bch_crc_bytes[s->csum_type];
  31
  32         return sizeof(struct bch_stripe) +
  33                 sizeof(struct bch_extent_ptr) * s->nr_blocks +
  34                 (dev * stripe_csums_per_device(s) + csum_idx) * csum_bytes;
  35 }
  36
  37 static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
  38                                                 unsigned idx)
  39 {
  40         return stripe_csum_offset(s, s->nr_blocks, 0) +
  41                 sizeof(u16) * idx;
  42 }
  43
  44 static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
  45                                              unsigned idx)
  46 {
  47         return le16_to_cpup((void *) s + stripe_blockcount_offset(s, idx));
  48 }
  49
  50 static inline void stripe_blockcount_set(struct bch_stripe *s,
  51                                          unsigned idx, unsigned v)
  52 {
  53         __le16 *p = (void *) s + stripe_blockcount_offset(s, idx);
  54
  55         *p = cpu_to_le16(v);
  56 }
  57
  58 static inline unsigned stripe_val_u64s(const struct bch_stripe *s)
  59 {
  60         return DIV_ROUND_UP(stripe_blockcount_offset(s, s->nr_blocks),
  61                             sizeof(u64));
  62 }
  63
  64 static inline void *stripe_csum(struct bch_stripe *s,
  65                                 unsigned block, unsigned csum_idx)
  66 {
  67         EBUG_ON(block >= s->nr_blocks);
  68         EBUG_ON(csum_idx >= stripe_csums_per_device(s));
  69
  70         return (void *) s + stripe_csum_offset(s, block, csum_idx);
  71 }
  72
  73 static inline struct bch_csum stripe_csum_get(struct bch_stripe *s,
  74                                    unsigned block, unsigned csum_idx)
  75 {
  76         struct bch_csum csum = { 0 };
  77
  78         memcpy(&csum, stripe_csum(s, block, csum_idx), bch_crc_bytes[s->csum_type]);
  79         return csum;
  80 }
  81
  82 static inline void stripe_csum_set(struct bch_stripe *s,
  83                                    unsigned block, unsigned csum_idx,
  84                                    struct bch_csum csum)
  85 {
  86         memcpy(stripe_csum(s, block, csum_idx), &csum, bch_crc_bytes[s->csum_type]);
  87 }
  88
  89 static inline bool __bch2_ptr_matches_stripe(const struct bch_extent_ptr *stripe_ptr,
  90                                              const struct bch_extent_ptr *data_ptr,
  91                                              unsigned sectors)
  92 {
  93         return  data_ptr->dev    == stripe_ptr->dev &&
  94                 data_ptr->gen    == stripe_ptr->gen &&
  95                 data_ptr->offset >= stripe_ptr->offset &&
  96                 data_ptr->offset  < stripe_ptr->offset + sectors;
  97 }
  98
  99 static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
 100                                            struct extent_ptr_decoded p)
 101 {
 102         unsigned nr_data = s->nr_blocks - s->nr_redundant;
 103
 104         BUG_ON(!p.has_ec);
 105
 106         if (p.ec.block >= nr_data)
 107                 return false;
 108
 109         return __bch2_ptr_matches_stripe(&s->ptrs[p.ec.block], &p.ptr,
 110                                          le16_to_cpu(s->sectors));
 111 }
 112
 113 static inline bool bch2_ptr_matches_stripe_m(const struct gc_stripe *m,
 114                                              struct extent_ptr_decoded p)
 115 {
 116         unsigned nr_data = m->nr_blocks - m->nr_redundant;
 117
 118         BUG_ON(!p.has_ec);
 119
 120         if (p.ec.block >= nr_data)
 121                 return false;
 122
 123         return __bch2_ptr_matches_stripe(&m->ptrs[p.ec.block], &p.ptr,
 124                                          m->sectors);
 125 }
 126
 127 struct bch_read_bio;
 128
 129 struct ec_stripe_buf {
 130         /* might not be buffering the entire stripe: */
 131         unsigned                offset;
 132         unsigned                size;
 133         unsigned long           valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 134
 135         void                    *data[BCH_BKEY_PTRS_MAX];
 136
 137         union {
 138                 struct bkey_i_stripe    key;
 139                 u64                     pad[255];
 140         };
 141 };
 142
 143 struct ec_stripe_head;
 144
 145 struct ec_stripe_new {
 146         struct bch_fs           *c;
 147         struct ec_stripe_head   *h;
 148         struct mutex            lock;
 149         struct list_head        list;
 150         struct closure          iodone;
 151
 152         /* counts in flight writes, stripe is created when pin == 0 */
 153         atomic_t                pin;
 154
 155         int                     err;
 156
 157         u8                      nr_data;
 158         u8                      nr_parity;
 159         bool                    allocated;
 160         bool                    pending;
 161         bool                    have_existing_stripe;
 162
 163         unsigned long           blocks_gotten[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 164         unsigned long           blocks_allocated[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 165         open_bucket_idx_t       blocks[BCH_BKEY_PTRS_MAX];
 166         struct disk_reservation res;
 167
 168         struct ec_stripe_buf    new_stripe;
 169         struct ec_stripe_buf    existing_stripe;
 170 };
 171
 172 struct ec_stripe_head {
 173         struct list_head        list;
 174         struct mutex            lock;
 175
 176         unsigned                target;
 177         unsigned                algo;
 178         unsigned                redundancy;
 179         bool                    copygc;
 180
 181         struct bch_devs_mask    devs;
 182         unsigned                nr_active_devs;
 183
 184         unsigned                blocksize;
 185
 186         struct dev_stripe_state block_stripe;
 187         struct dev_stripe_state parity_stripe;
 188
 189         struct ec_stripe_new    *s;
 190 };
 191
 192 int bch2_ec_read_extent(struct bch_fs *, struct bch_read_bio *);
 193
 194 void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
 195
 196 void bch2_ec_bucket_written(struct bch_fs *, struct open_bucket *);
 197 void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
 198
 199 int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
 200
 201 void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
 202 struct ec_stripe_head *bch2_ec_stripe_head_get(struct bch_fs *,
 203                         unsigned, unsigned, unsigned, bool, struct closure *);
 204
 205 void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
 206 void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
 207 void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
 208
 209 void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
 210
 211 void bch2_ec_flush_new_stripes(struct bch_fs *);
 212
 213 void bch2_stripes_heap_start(struct bch_fs *);
 214
 215 int bch2_stripes_read(struct bch_fs *);
 216
 217 void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
 218 void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
 219
 220 void bch2_fs_ec_exit(struct bch_fs *);
 221 void bch2_fs_ec_init_early(struct bch_fs *);
 222 int bch2_fs_ec_init(struct bch_fs *);
 223
 224 #endif /* _BCACHEFS_EC_H */