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 #include "extents_types.h"
   8
   9 enum bkey_invalid_flags;
  10
  11 int bch2_stripe_invalid(const struct bch_fs *, struct bkey_s_c,
  12                         enum bkey_invalid_flags, struct printbuf *);
  13 void bch2_stripe_to_text(struct printbuf *, struct bch_fs *,
  14                          struct bkey_s_c);
  15
  16 #define bch2_bkey_ops_stripe ((struct bkey_ops) {       \
  17         .key_invalid    = bch2_stripe_invalid,          \
  18         .val_to_text    = bch2_stripe_to_text,          \
  19         .swab           = bch2_ptr_swab,                \
  20         .trans_trigger  = bch2_trans_mark_stripe,       \
  21         .atomic_trigger = bch2_mark_stripe,             \
  22         .min_val_size   = 8,                            \
  23 })
  24
  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
  31 static inline unsigned stripe_csum_offset(const struct bch_stripe *s,
  32                                           unsigned dev, unsigned csum_idx)
  33 {
  34         unsigned csum_bytes = bch_crc_bytes[s->csum_type];
  35
  36         return sizeof(struct bch_stripe) +
  37                 sizeof(struct bch_extent_ptr) * s->nr_blocks +
  38                 (dev * stripe_csums_per_device(s) + csum_idx) * csum_bytes;
  39 }
  40
  41 static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
  42                                                 unsigned idx)
  43 {
  44         return stripe_csum_offset(s, s->nr_blocks, 0) +
  45                 sizeof(u16) * idx;
  46 }
  47
  48 static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
  49                                              unsigned idx)
  50 {
  51         return le16_to_cpup((void *) s + stripe_blockcount_offset(s, idx));
  52 }
  53
  54 static inline void stripe_blockcount_set(struct bch_stripe *s,
  55                                          unsigned idx, unsigned v)
  56 {
  57         __le16 *p = (void *) s + stripe_blockcount_offset(s, idx);
  58
  59         *p = cpu_to_le16(v);
  60 }
  61
  62 static inline unsigned stripe_val_u64s(const struct bch_stripe *s)
  63 {
  64         return DIV_ROUND_UP(stripe_blockcount_offset(s, s->nr_blocks),
  65                             sizeof(u64));
  66 }
  67
  68 static inline void *stripe_csum(struct bch_stripe *s,
  69                                 unsigned block, unsigned csum_idx)
  70 {
  71         EBUG_ON(block >= s->nr_blocks);
  72         EBUG_ON(csum_idx >= stripe_csums_per_device(s));
  73
  74         return (void *) s + stripe_csum_offset(s, block, csum_idx);
  75 }
  76
  77 static inline struct bch_csum stripe_csum_get(struct bch_stripe *s,
  78                                    unsigned block, unsigned csum_idx)
  79 {
  80         struct bch_csum csum = { 0 };
  81
  82         memcpy(&csum, stripe_csum(s, block, csum_idx), bch_crc_bytes[s->csum_type]);
  83         return csum;
  84 }
  85
  86 static inline void stripe_csum_set(struct bch_stripe *s,
  87                                    unsigned block, unsigned csum_idx,
  88                                    struct bch_csum csum)
  89 {
  90         memcpy(stripe_csum(s, block, csum_idx), &csum, bch_crc_bytes[s->csum_type]);
  91 }
  92
  93 static inline bool __bch2_ptr_matches_stripe(const struct bch_extent_ptr *stripe_ptr,
  94                                              const struct bch_extent_ptr *data_ptr,
  95                                              unsigned sectors)
  96 {
  97         return  data_ptr->dev    == stripe_ptr->dev &&
  98                 data_ptr->gen    == stripe_ptr->gen &&
  99                 data_ptr->offset >= stripe_ptr->offset &&
 100                 data_ptr->offset  < stripe_ptr->offset + sectors;
 101 }
 102
 103 static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
 104                                            struct extent_ptr_decoded p)
 105 {
 106         unsigned nr_data = s->nr_blocks - s->nr_redundant;
 107
 108         BUG_ON(!p.has_ec);
 109
 110         if (p.ec.block >= nr_data)
 111                 return false;
 112
 113         return __bch2_ptr_matches_stripe(&s->ptrs[p.ec.block], &p.ptr,
 114                                          le16_to_cpu(s->sectors));
 115 }
 116
 117 static inline bool bch2_ptr_matches_stripe_m(const struct gc_stripe *m,
 118                                              struct extent_ptr_decoded p)
 119 {
 120         unsigned nr_data = m->nr_blocks - m->nr_redundant;
 121
 122         BUG_ON(!p.has_ec);
 123
 124         if (p.ec.block >= nr_data)
 125                 return false;
 126
 127         return __bch2_ptr_matches_stripe(&m->ptrs[p.ec.block], &p.ptr,
 128                                          m->sectors);
 129 }
 130
 131 struct bch_read_bio;
 132
 133 struct ec_stripe_buf {
 134         /* might not be buffering the entire stripe: */
 135         unsigned                offset;
 136         unsigned                size;
 137         unsigned long           valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 138
 139         void                    *data[BCH_BKEY_PTRS_MAX];
 140
 141         union {
 142                 struct bkey_i_stripe    key;
 143                 u64                     pad[255];
 144         };
 145 };
 146
 147 struct ec_stripe_head;
 148
 149 enum ec_stripe_ref {
 150         STRIPE_REF_io,
 151         STRIPE_REF_stripe,
 152         STRIPE_REF_NR
 153 };
 154
 155 struct 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
 185 struct 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
 205 int bch2_ec_read_extent(struct bch_fs *, struct bch_read_bio *);
 206
 207 void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
 208
 209 void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
 210
 211 int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
 212
 213 void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
 214 struct ec_stripe_head *bch2_ec_stripe_head_get(struct btree_trans *,
 215                         unsigned, unsigned, unsigned,
 216                         enum bch_watermark, struct closure *);
 217
 218 void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
 219 void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
 220 void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
 221
 222 void bch2_do_stripe_deletes(struct bch_fs *);
 223 void bch2_ec_do_stripe_creates(struct bch_fs *);
 224 void bch2_ec_stripe_new_free(struct bch_fs *, struct ec_stripe_new *);
 225
 226 static inline void ec_stripe_new_get(struct ec_stripe_new *s,
 227                                      enum ec_stripe_ref ref)
 228 {
 229         atomic_inc(&s->ref[ref]);
 230 }
 231
 232 static 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(&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                         unreachable();
 247                 }
 248 }
 249
 250 void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
 251 void bch2_fs_ec_stop(struct bch_fs *);
 252 void bch2_fs_ec_flush(struct bch_fs *);
 253
 254 int bch2_stripes_read(struct bch_fs *);
 255
 256 void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
 257 void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
 258
 259 void bch2_fs_ec_exit(struct bch_fs *);
 260 void bch2_fs_ec_init_early(struct bch_fs *);
 261 int bch2_fs_ec_init(struct bch_fs *);
 262
 263 #endif /* _BCACHEFS_EC_H */