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 "keylist_types.h"
   8
   9 const char *bch2_stripe_invalid(const struct bch_fs *, struct bkey_s_c);
  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 }
  18
  19 static inline unsigned stripe_csums_per_device(const struct bch_stripe *s)
  20 {
  21         return DIV_ROUND_UP(le16_to_cpu(s->sectors),
  22                             1 << s->csum_granularity_bits);
  23 }
  24
  25 static inline unsigned stripe_csum_offset(const struct bch_stripe *s,
  26                                           unsigned dev, unsigned csum_idx)
  27 {
  28         unsigned csum_bytes = bch_crc_bytes[s->csum_type];
  29
  30         return sizeof(struct bch_stripe) +
  31                 sizeof(struct bch_extent_ptr) * s->nr_blocks +
  32                 (dev * stripe_csums_per_device(s) + csum_idx) * csum_bytes;
  33 }
  34
  35 static inline unsigned stripe_blockcount_offset(const struct bch_stripe *s,
  36                                                 unsigned idx)
  37 {
  38         return stripe_csum_offset(s, s->nr_blocks, 0) +
  39                 sizeof(u16) * idx;
  40 }
  41
  42 static inline unsigned stripe_blockcount_get(const struct bch_stripe *s,
  43                                              unsigned idx)
  44 {
  45         return le16_to_cpup((void *) s + stripe_blockcount_offset(s, idx));
  46 }
  47
  48 static inline void stripe_blockcount_set(struct bch_stripe *s,
  49                                          unsigned idx, unsigned v)
  50 {
  51         __le16 *p = (void *) s + stripe_blockcount_offset(s, idx);
  52
  53         *p = cpu_to_le16(v);
  54 }
  55
  56 static inline unsigned stripe_val_u64s(const struct bch_stripe *s)
  57 {
  58         return DIV_ROUND_UP(stripe_blockcount_offset(s, s->nr_blocks),
  59                             sizeof(u64));
  60 }
  61
  62 static inline void *stripe_csum(struct bch_stripe *s,
  63                                 unsigned block, unsigned csum_idx)
  64 {
  65         EBUG_ON(block >= s->nr_blocks);
  66         EBUG_ON(csum_idx >= stripe_csums_per_device(s));
  67
  68         return (void *) s + stripe_csum_offset(s, block, csum_idx);
  69 }
  70
  71 static inline struct bch_csum stripe_csum_get(struct bch_stripe *s,
  72                                    unsigned block, unsigned csum_idx)
  73 {
  74         struct bch_csum csum = { 0 };
  75
  76         memcpy(&csum, stripe_csum(s, block, csum_idx), bch_crc_bytes[s->csum_type]);
  77         return csum;
  78 }
  79
  80 static inline void stripe_csum_set(struct bch_stripe *s,
  81                                    unsigned block, unsigned csum_idx,
  82                                    struct bch_csum csum)
  83 {
  84         memcpy(stripe_csum(s, block, csum_idx), &csum, bch_crc_bytes[s->csum_type]);
  85 }
  86
  87 static inline bool __bch2_ptr_matches_stripe(const struct bch_stripe *s,
  88                                              const struct bch_extent_ptr *ptr,
  89                                              unsigned block)
  90 {
  91         unsigned nr_data = s->nr_blocks - s->nr_redundant;
  92
  93         if (block >= nr_data)
  94                 return false;
  95
  96         return  ptr->dev    == s->ptrs[block].dev &&
  97                 ptr->gen    == s->ptrs[block].gen &&
  98                 ptr->offset >= s->ptrs[block].offset &&
  99                 ptr->offset  < s->ptrs[block].offset + le16_to_cpu(s->sectors);
 100 }
 101
 102 static inline bool bch2_ptr_matches_stripe(const struct bch_stripe *s,
 103                                            struct extent_ptr_decoded p)
 104 {
 105         BUG_ON(!p.has_ec);
 106
 107         return __bch2_ptr_matches_stripe(s, &p.ptr, p.ec.block);
 108 }
 109
 110 struct bch_read_bio;
 111
 112 struct ec_stripe_buf {
 113         /* might not be buffering the entire stripe: */
 114         unsigned                offset;
 115         unsigned                size;
 116         unsigned long           valid[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 117
 118         void                    *data[BCH_BKEY_PTRS_MAX];
 119
 120         union {
 121                 struct bkey_i_stripe    key;
 122                 u64                     pad[255];
 123         };
 124 };
 125
 126 struct ec_stripe_head;
 127
 128 struct ec_stripe_new {
 129         struct bch_fs           *c;
 130         struct ec_stripe_head   *h;
 131         struct mutex            lock;
 132         struct list_head        list;
 133         struct closure          iodone;
 134
 135         /* counts in flight writes, stripe is created when pin == 0 */
 136         atomic_t                pin;
 137
 138         int                     err;
 139
 140         u8                      nr_data;
 141         u8                      nr_parity;
 142         bool                    allocated;
 143         bool                    pending;
 144         bool                    have_existing_stripe;
 145
 146         unsigned long           blocks_gotten[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 147         unsigned long           blocks_allocated[BITS_TO_LONGS(BCH_BKEY_PTRS_MAX)];
 148         open_bucket_idx_t       blocks[BCH_BKEY_PTRS_MAX];
 149         struct disk_reservation res;
 150
 151         struct keylist          keys;
 152         u64                     inline_keys[BKEY_U64s * 8];
 153
 154         struct ec_stripe_buf    new_stripe;
 155         struct ec_stripe_buf    existing_stripe;
 156 };
 157
 158 struct ec_stripe_head {
 159         struct list_head        list;
 160         struct mutex            lock;
 161
 162         unsigned                target;
 163         unsigned                algo;
 164         unsigned                redundancy;
 165         bool                    copygc;
 166
 167         struct bch_devs_mask    devs;
 168         unsigned                nr_active_devs;
 169
 170         unsigned                blocksize;
 171
 172         struct dev_stripe_state block_stripe;
 173         struct dev_stripe_state parity_stripe;
 174
 175         struct ec_stripe_new    *s;
 176 };
 177
 178 int bch2_ec_read_extent(struct bch_fs *, struct bch_read_bio *);
 179
 180 void *bch2_writepoint_ec_buf(struct bch_fs *, struct write_point *);
 181 void bch2_ec_add_backpointer(struct bch_fs *, struct write_point *,
 182                              struct bpos, unsigned);
 183
 184 void bch2_ec_bucket_written(struct bch_fs *, struct open_bucket *);
 185 void bch2_ec_bucket_cancel(struct bch_fs *, struct open_bucket *);
 186
 187 int bch2_ec_stripe_new_alloc(struct bch_fs *, struct ec_stripe_head *);
 188
 189 void bch2_ec_stripe_head_put(struct bch_fs *, struct ec_stripe_head *);
 190 struct ec_stripe_head *bch2_ec_stripe_head_get(struct bch_fs *,
 191                         unsigned, unsigned, unsigned, bool, struct closure *);
 192
 193 void bch2_stripes_heap_update(struct bch_fs *, struct stripe *, size_t);
 194 void bch2_stripes_heap_del(struct bch_fs *, struct stripe *, size_t);
 195 void bch2_stripes_heap_insert(struct bch_fs *, struct stripe *, size_t);
 196
 197 void bch2_ec_stop_dev(struct bch_fs *, struct bch_dev *);
 198
 199 void bch2_ec_flush_new_stripes(struct bch_fs *);
 200
 201 void bch2_stripes_heap_start(struct bch_fs *);
 202
 203 struct journal_keys;
 204 int bch2_stripes_read(struct bch_fs *, struct journal_keys *);
 205 int bch2_stripes_write(struct bch_fs *, unsigned);
 206
 207 int bch2_ec_mem_alloc(struct bch_fs *, bool);
 208
 209 void bch2_stripes_heap_to_text(struct printbuf *, struct bch_fs *);
 210 void bch2_new_stripes_to_text(struct printbuf *, struct bch_fs *);
 211
 212 void bch2_fs_ec_exit(struct bch_fs *);
 213 int bch2_fs_ec_init(struct bch_fs *);
 214
 215 #endif /* _BCACHEFS_EC_H */