fs/bcachefs/subvolume.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _BCACHEFS_SUBVOLUME_H
   3 #define _BCACHEFS_SUBVOLUME_H
   4
   5 #include "darray.h"
   6 #include "subvolume_types.h"
   7
   8 int bch2_check_subvols(struct bch_fs *);
   9 int bch2_check_subvol_children(struct bch_fs *);
  10
  11 int bch2_subvolume_validate(struct bch_fs *, struct bkey_s_c,
  12                             struct bkey_validate_context);
  13 void bch2_subvolume_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
  14 int bch2_subvolume_trigger(struct btree_trans *, enum btree_id, unsigned,
  15                            struct bkey_s_c, struct bkey_s,
  16                            enum btree_iter_update_trigger_flags);
  17
  18 #define bch2_bkey_ops_subvolume ((struct bkey_ops) {            \
  19         .key_validate   = bch2_subvolume_validate,              \
  20         .val_to_text    = bch2_subvolume_to_text,               \
  21         .trigger        = bch2_subvolume_trigger,               \
  22         .min_val_size   = 16,                                   \
  23 })
  24
  25 int bch2_subvol_has_children(struct btree_trans *, u32);
  26 int bch2_subvolume_get(struct btree_trans *, unsigned,
  27                        bool, struct bch_subvolume *);
  28 int __bch2_subvolume_get_snapshot(struct btree_trans *, u32,
  29                                   u32 *, bool);
  30 int bch2_subvolume_get_snapshot(struct btree_trans *, u32, u32 *);
  31
  32 int bch2_subvol_is_ro_trans(struct btree_trans *, u32);
  33 int bch2_subvol_is_ro(struct bch_fs *, u32);
  34
  35 static inline struct bkey_s_c
  36 bch2_btree_iter_peek_in_subvolume_max_type(struct btree_iter *iter, struct bpos end,
  37                                             u32 subvolid, unsigned flags)
  38 {
  39         u32 snapshot;
  40         int ret = bch2_subvolume_get_snapshot(iter->trans, subvolid, &snapshot);
  41         if (ret)
  42                 return bkey_s_c_err(ret);
  43
  44         bch2_btree_iter_set_snapshot(iter, snapshot);
  45         return bch2_btree_iter_peek_max_type(iter, end, flags);
  46 }
  47
  48 #define for_each_btree_key_in_subvolume_max_continue(_trans, _iter,             \
  49                                          _end, _subvolid, _flags, _k, _do)      \
  50 ({                                                                              \
  51         struct bkey_s_c _k;                                                     \
  52         int _ret3 = 0;                                                          \
  53                                                                                 \
  54         do {                                                                    \
  55                 _ret3 = lockrestart_do(_trans, ({                               \
  56                         (_k) = bch2_btree_iter_peek_in_subvolume_max_type(&(_iter),     \
  57                                                 _end, _subvolid, (_flags));     \
  58                         if (!(_k).k)                                            \
  59                                 break;                                          \
  60                                                                                 \
  61                         bkey_err(_k) ?: (_do);                                  \
  62                 }));                                                            \
  63         } while (!_ret3 && bch2_btree_iter_advance(&(_iter)));                  \
  64                                                                                 \
  65         bch2_trans_iter_exit((_trans), &(_iter));                               \
  66         _ret3;                                                                  \
  67 })
  68
  69 #define for_each_btree_key_in_subvolume_max(_trans, _iter, _btree_id,           \
  70                                 _start, _end, _subvolid, _flags, _k, _do)       \
  71 ({                                                                              \
  72         struct btree_iter _iter;                                                \
  73         bch2_trans_iter_init((_trans), &(_iter), (_btree_id),                   \
  74                              (_start), (_flags));                               \
  75                                                                                 \
  76         for_each_btree_key_in_subvolume_max_continue(_trans, _iter,             \
  77                                         _end, _subvolid, _flags, _k, _do);      \
  78 })
  79
  80 int bch2_delete_dead_snapshots(struct bch_fs *);
  81 void bch2_delete_dead_snapshots_async(struct bch_fs *);
  82
  83 int bch2_subvolume_unlink(struct btree_trans *, u32);
  84 int bch2_subvolume_create(struct btree_trans *, u64, u32, u32, u32 *, u32 *, bool);
  85
  86 int bch2_initialize_subvolumes(struct bch_fs *);
  87 int bch2_fs_upgrade_for_subvolumes(struct bch_fs *);
  88
  89 int bch2_fs_subvolumes_init(struct bch_fs *);
  90
  91 #endif /* _BCACHEFS_SUBVOLUME_H */