fs/bcachefs/btree_update.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_BTREE_UPDATE_H
   3 #define _BCACHEFS_BTREE_UPDATE_H
   4
   5 #include "btree_iter.h"
   6 #include "journal.h"
   7
   8 struct bch_fs;
   9 struct btree;
  10
  11 void bch2_btree_node_prep_for_write(struct btree_trans *,
  12                                     struct btree_path *, struct btree *);
  13 bool bch2_btree_bset_insert_key(struct btree_trans *, struct btree_path *,
  14                                 struct btree *, struct btree_node_iter *,
  15                                 struct bkey_i *);
  16
  17 int bch2_btree_node_flush0(struct journal *, struct journal_entry_pin *, u64);
  18 int bch2_btree_node_flush1(struct journal *, struct journal_entry_pin *, u64);
  19 void bch2_btree_add_journal_pin(struct bch_fs *, struct btree *, u64);
  20
  21 void bch2_btree_insert_key_leaf(struct btree_trans *, struct btree_path *,
  22                                 struct bkey_i *, u64);
  23
  24 #define BCH_TRANS_COMMIT_FLAGS()                                                        \
  25         x(no_enospc,    "don't check for enospc")                                       \
  26         x(no_check_rw,  "don't attempt to take a ref on c->writes")                     \
  27         x(lazy_rw,      "go read-write if we haven't yet - only for use in recovery")   \
  28         x(no_journal_res, "don't take a journal reservation, instead "                  \
  29                         "pin journal entry referred to by trans->journal_res.seq")      \
  30         x(journal_reclaim, "operation required for journal reclaim; may return error"   \
  31                         "instead of deadlocking if BCH_WATERMARK_reclaim not specified")\
  32         x(skip_accounting_apply, "we're in journal replay - accounting updates have already been applied")
  33
  34 enum __bch_trans_commit_flags {
  35         /* First bits for bch_watermark: */
  36         __BCH_TRANS_COMMIT_FLAGS_START = BCH_WATERMARK_BITS,
  37 #define x(n, ...)       __BCH_TRANS_COMMIT_##n,
  38         BCH_TRANS_COMMIT_FLAGS()
  39 #undef x
  40 };
  41
  42 enum bch_trans_commit_flags {
  43 #define x(n, ...)       BCH_TRANS_COMMIT_##n = BIT(__BCH_TRANS_COMMIT_##n),
  44         BCH_TRANS_COMMIT_FLAGS()
  45 #undef x
  46 };
  47
  48 void bch2_trans_commit_flags_to_text(struct printbuf *, enum bch_trans_commit_flags);
  49
  50 int bch2_btree_delete_extent_at(struct btree_trans *, struct btree_iter *,
  51                                 unsigned, unsigned);
  52 int bch2_btree_delete_at(struct btree_trans *, struct btree_iter *, unsigned);
  53 int bch2_btree_delete(struct btree_trans *, enum btree_id, struct bpos, unsigned);
  54
  55 int bch2_btree_insert_nonextent(struct btree_trans *, enum btree_id,
  56                                 struct bkey_i *, enum btree_iter_update_trigger_flags);
  57
  58 int bch2_btree_insert_trans(struct btree_trans *, enum btree_id, struct bkey_i *,
  59                         enum btree_iter_update_trigger_flags);
  60 int bch2_btree_insert(struct bch_fs *, enum btree_id, struct bkey_i *, struct
  61                 disk_reservation *, int flags, enum
  62                 btree_iter_update_trigger_flags iter_flags);
  63
  64 int bch2_btree_delete_range_trans(struct btree_trans *, enum btree_id,
  65                                   struct bpos, struct bpos, unsigned, u64 *);
  66 int bch2_btree_delete_range(struct bch_fs *, enum btree_id,
  67                             struct bpos, struct bpos, unsigned, u64 *);
  68
  69 int bch2_btree_bit_mod(struct btree_trans *, enum btree_id, struct bpos, bool);
  70 int bch2_btree_bit_mod_buffered(struct btree_trans *, enum btree_id, struct bpos, bool);
  71
  72 static inline int bch2_btree_delete_at_buffered(struct btree_trans *trans,
  73                                                 enum btree_id btree, struct bpos pos)
  74 {
  75         return bch2_btree_bit_mod_buffered(trans, btree, pos, false);
  76 }
  77
  78 int __bch2_insert_snapshot_whiteouts(struct btree_trans *, enum btree_id,
  79                                      struct bpos, struct bpos);
  80
  81 /*
  82  * For use when splitting extents in existing snapshots:
  83  *
  84  * If @old_pos is an interior snapshot node, iterate over descendent snapshot
  85  * nodes: for every descendent snapshot in whiche @old_pos is overwritten and
  86  * not visible, emit a whiteout at @new_pos.
  87  */
  88 static inline int bch2_insert_snapshot_whiteouts(struct btree_trans *trans,
  89                                                  enum btree_id btree,
  90                                                  struct bpos old_pos,
  91                                                  struct bpos new_pos)
  92 {
  93         if (!btree_type_has_snapshots(btree) ||
  94             bkey_eq(old_pos, new_pos))
  95                 return 0;
  96
  97         return __bch2_insert_snapshot_whiteouts(trans, btree, old_pos, new_pos);
  98 }
  99
 100 int bch2_trans_update_extent_overwrite(struct btree_trans *, struct btree_iter *,
 101                                        enum btree_iter_update_trigger_flags,
 102                                        struct bkey_s_c, struct bkey_s_c);
 103
 104 int bch2_bkey_get_empty_slot(struct btree_trans *, struct btree_iter *,
 105                              enum btree_id, struct bpos);
 106
 107 int __must_check bch2_trans_update(struct btree_trans *, struct btree_iter *,
 108                                    struct bkey_i *, enum btree_iter_update_trigger_flags);
 109
 110 struct jset_entry *__bch2_trans_jset_entry_alloc(struct btree_trans *, unsigned);
 111
 112 static inline struct jset_entry *btree_trans_journal_entries_top(struct btree_trans *trans)
 113 {
 114         return (void *) ((u64 *) trans->journal_entries + trans->journal_entries_u64s);
 115 }
 116
 117 static inline struct jset_entry *
 118 bch2_trans_jset_entry_alloc(struct btree_trans *trans, unsigned u64s)
 119 {
 120         if (!trans->journal_entries ||
 121             trans->journal_entries_u64s + u64s > trans->journal_entries_size)
 122                 return __bch2_trans_jset_entry_alloc(trans, u64s);
 123
 124         struct jset_entry *e = btree_trans_journal_entries_top(trans);
 125         trans->journal_entries_u64s += u64s;
 126         return e;
 127 }
 128
 129 int bch2_btree_insert_clone_trans(struct btree_trans *, enum btree_id, struct bkey_i *);
 130
 131 static inline int __must_check bch2_trans_update_buffered(struct btree_trans *trans,
 132                                             enum btree_id btree,
 133                                             struct bkey_i *k)
 134 {
 135         /*
 136          * Most updates skip the btree write buffer until journal replay is
 137          * finished because synchronization with journal replay relies on having
 138          * a btree node locked - if we're overwriting a key in the journal that
 139          * journal replay hasn't yet replayed, we have to mark it as
 140          * overwritten.
 141          *
 142          * But accounting updates don't overwrite, they're deltas, and they have
 143          * to be flushed to the btree strictly in order for journal replay to be
 144          * able to tell which updates need to be applied:
 145          */
 146         if (k->k.type != KEY_TYPE_accounting &&
 147             unlikely(trans->journal_replay_not_finished))
 148                 return bch2_btree_insert_clone_trans(trans, btree, k);
 149
 150         struct jset_entry *e = bch2_trans_jset_entry_alloc(trans, jset_u64s(k->k.u64s));
 151         int ret = PTR_ERR_OR_ZERO(e);
 152         if (ret)
 153                 return ret;
 154
 155         journal_entry_init(e, BCH_JSET_ENTRY_write_buffer_keys, btree, 0, k->k.u64s);
 156         bkey_copy(e->start, k);
 157         return 0;
 158 }
 159
 160 void bch2_trans_commit_hook(struct btree_trans *,
 161                             struct btree_trans_commit_hook *);
 162 int __bch2_trans_commit(struct btree_trans *, unsigned);
 163
 164 __printf(2, 3) int bch2_fs_log_msg(struct bch_fs *, const char *, ...);
 165 __printf(2, 3) int bch2_journal_log_msg(struct bch_fs *, const char *, ...);
 166
 167 /**
 168  * bch2_trans_commit - insert keys at given iterator positions
 169  *
 170  * This is main entry point for btree updates.
 171  *
 172  * Return values:
 173  * -EROFS: filesystem read only
 174  * -EIO: journal or btree node IO error
 175  */
 176 static inline int bch2_trans_commit(struct btree_trans *trans,
 177                                     struct disk_reservation *disk_res,
 178                                     u64 *journal_seq,
 179                                     unsigned flags)
 180 {
 181         trans->disk_res         = disk_res;
 182         trans->journal_seq      = journal_seq;
 183
 184         return __bch2_trans_commit(trans, flags);
 185 }
 186
 187 #define commit_do(_trans, _disk_res, _journal_seq, _flags, _do) \
 188         lockrestart_do(_trans, _do ?: bch2_trans_commit(_trans, (_disk_res),\
 189                                         (_journal_seq), (_flags)))
 190
 191 #define nested_commit_do(_trans, _disk_res, _journal_seq, _flags, _do)  \
 192         nested_lockrestart_do(_trans, _do ?: bch2_trans_commit(_trans, (_disk_res),\
 193                                         (_journal_seq), (_flags)))
 194
 195 #define bch2_trans_commit_do(_c, _disk_res, _journal_seq, _flags, _do)          \
 196         bch2_trans_run(_c, commit_do(trans, _disk_res, _journal_seq, _flags, _do))
 197
 198 #define trans_for_each_update(_trans, _i)                               \
 199         for (struct btree_insert_entry *_i = (_trans)->updates;         \
 200              (_i) < (_trans)->updates + (_trans)->nr_updates;           \
 201              (_i)++)
 202
 203 static inline void bch2_trans_reset_updates(struct btree_trans *trans)
 204 {
 205         trans_for_each_update(trans, i)
 206                 bch2_path_put(trans, i->path, true);
 207
 208         trans->nr_updates               = 0;
 209         trans->journal_entries_u64s     = 0;
 210         trans->hooks                    = NULL;
 211         trans->extra_disk_res           = 0;
 212 }
 213
 214 static inline struct bkey_i *__bch2_bkey_make_mut_noupdate(struct btree_trans *trans, struct bkey_s_c k,
 215                                                   unsigned type, unsigned min_bytes)
 216 {
 217         unsigned bytes = max_t(unsigned, min_bytes, bkey_bytes(k.k));
 218         struct bkey_i *mut;
 219
 220         if (type && k.k->type != type)
 221                 return ERR_PTR(-ENOENT);
 222
 223         /* extra padding for varint_decode_fast... */
 224         mut = bch2_trans_kmalloc_nomemzero(trans, bytes + 8);
 225         if (!IS_ERR(mut)) {
 226                 bkey_reassemble(mut, k);
 227
 228                 if (unlikely(bytes > bkey_bytes(k.k))) {
 229                         memset((void *) mut + bkey_bytes(k.k), 0,
 230                                bytes - bkey_bytes(k.k));
 231                         mut->k.u64s = DIV_ROUND_UP(bytes, sizeof(u64));
 232                 }
 233         }
 234         return mut;
 235 }
 236
 237 static inline struct bkey_i *bch2_bkey_make_mut_noupdate(struct btree_trans *trans, struct bkey_s_c k)
 238 {
 239         return __bch2_bkey_make_mut_noupdate(trans, k, 0, 0);
 240 }
 241
 242 #define bch2_bkey_make_mut_noupdate_typed(_trans, _k, _type)            \
 243         bkey_i_to_##_type(__bch2_bkey_make_mut_noupdate(_trans, _k,     \
 244                                 KEY_TYPE_##_type, sizeof(struct bkey_i_##_type)))
 245
 246 static inline struct bkey_i *__bch2_bkey_make_mut(struct btree_trans *trans, struct btree_iter *iter,
 247                                         struct bkey_s_c *k, unsigned flags,
 248                                         unsigned type, unsigned min_bytes)
 249 {
 250         struct bkey_i *mut = __bch2_bkey_make_mut_noupdate(trans, *k, type, min_bytes);
 251         int ret;
 252
 253         if (IS_ERR(mut))
 254                 return mut;
 255
 256         ret = bch2_trans_update(trans, iter, mut, flags);
 257         if (ret)
 258                 return ERR_PTR(ret);
 259
 260         *k = bkey_i_to_s_c(mut);
 261         return mut;
 262 }
 263
 264 static inline struct bkey_i *bch2_bkey_make_mut(struct btree_trans *trans, struct btree_iter *iter,
 265                                                 struct bkey_s_c *k, unsigned flags)
 266 {
 267         return __bch2_bkey_make_mut(trans, iter, k, flags, 0, 0);
 268 }
 269
 270 #define bch2_bkey_make_mut_typed(_trans, _iter, _k, _flags, _type)      \
 271         bkey_i_to_##_type(__bch2_bkey_make_mut(_trans, _iter, _k, _flags,\
 272                                 KEY_TYPE_##_type, sizeof(struct bkey_i_##_type)))
 273
 274 static inline struct bkey_i *__bch2_bkey_get_mut_noupdate(struct btree_trans *trans,
 275                                          struct btree_iter *iter,
 276                                          unsigned btree_id, struct bpos pos,
 277                                          unsigned flags, unsigned type, unsigned min_bytes)
 278 {
 279         struct bkey_s_c k = __bch2_bkey_get_iter(trans, iter,
 280                                 btree_id, pos, flags|BTREE_ITER_intent, type);
 281         struct bkey_i *ret = IS_ERR(k.k)
 282                 ? ERR_CAST(k.k)
 283                 : __bch2_bkey_make_mut_noupdate(trans, k, 0, min_bytes);
 284         if (IS_ERR(ret))
 285                 bch2_trans_iter_exit(trans, iter);
 286         return ret;
 287 }
 288
 289 static inline struct bkey_i *bch2_bkey_get_mut_noupdate(struct btree_trans *trans,
 290                                                struct btree_iter *iter,
 291                                                unsigned btree_id, struct bpos pos,
 292                                                unsigned flags)
 293 {
 294         return __bch2_bkey_get_mut_noupdate(trans, iter, btree_id, pos, flags, 0, 0);
 295 }
 296
 297 static inline struct bkey_i *__bch2_bkey_get_mut(struct btree_trans *trans,
 298                                          struct btree_iter *iter,
 299                                          unsigned btree_id, struct bpos pos,
 300                                          unsigned flags, unsigned type, unsigned min_bytes)
 301 {
 302         struct bkey_i *mut = __bch2_bkey_get_mut_noupdate(trans, iter,
 303                                 btree_id, pos, flags|BTREE_ITER_intent, type, min_bytes);
 304         int ret;
 305
 306         if (IS_ERR(mut))
 307                 return mut;
 308
 309         ret = bch2_trans_update(trans, iter, mut, flags);
 310         if (ret) {
 311                 bch2_trans_iter_exit(trans, iter);
 312                 return ERR_PTR(ret);
 313         }
 314
 315         return mut;
 316 }
 317
 318 static inline struct bkey_i *bch2_bkey_get_mut_minsize(struct btree_trans *trans,
 319                                                        struct btree_iter *iter,
 320                                                        unsigned btree_id, struct bpos pos,
 321                                                        unsigned flags, unsigned min_bytes)
 322 {
 323         return __bch2_bkey_get_mut(trans, iter, btree_id, pos, flags, 0, min_bytes);
 324 }
 325
 326 static inline struct bkey_i *bch2_bkey_get_mut(struct btree_trans *trans,
 327                                                struct btree_iter *iter,
 328                                                unsigned btree_id, struct bpos pos,
 329                                                unsigned flags)
 330 {
 331         return __bch2_bkey_get_mut(trans, iter, btree_id, pos, flags, 0, 0);
 332 }
 333
 334 #define bch2_bkey_get_mut_typed(_trans, _iter, _btree_id, _pos, _flags, _type)\
 335         bkey_i_to_##_type(__bch2_bkey_get_mut(_trans, _iter,            \
 336                         _btree_id, _pos, _flags,                        \
 337                         KEY_TYPE_##_type, sizeof(struct bkey_i_##_type)))
 338
 339 static inline struct bkey_i *__bch2_bkey_alloc(struct btree_trans *trans, struct btree_iter *iter,
 340                                                unsigned flags, unsigned type, unsigned val_size)
 341 {
 342         struct bkey_i *k = bch2_trans_kmalloc(trans, sizeof(*k) + val_size);
 343         int ret;
 344
 345         if (IS_ERR(k))
 346                 return k;
 347
 348         bkey_init(&k->k);
 349         k->k.p = iter->pos;
 350         k->k.type = type;
 351         set_bkey_val_bytes(&k->k, val_size);
 352
 353         ret = bch2_trans_update(trans, iter, k, flags);
 354         if (unlikely(ret))
 355                 return ERR_PTR(ret);
 356         return k;
 357 }
 358
 359 #define bch2_bkey_alloc(_trans, _iter, _flags, _type)                   \
 360         bkey_i_to_##_type(__bch2_bkey_alloc(_trans, _iter, _flags,      \
 361                                 KEY_TYPE_##_type, sizeof(struct bch_##_type)))
 362
 363 #endif /* _BCACHEFS_BTREE_UPDATE_H */