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
 8enum bch_validate_flags;
 9
10int bch2_check_subvols(struct bch_fs *);
11int bch2_check_subvol_children(struct bch_fs *);
12
13int bch2_subvolume_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags);
14void bch2_subvolume_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
15int bch2_subvolume_trigger(struct btree_trans *, enum btree_id, unsigned,
16			   struct bkey_s_c, struct bkey_s,
17			   enum btree_iter_update_trigger_flags);
18
19#define bch2_bkey_ops_subvolume ((struct bkey_ops) {		\
20	.key_validate	= bch2_subvolume_validate,		\
21	.val_to_text	= bch2_subvolume_to_text,		\
22	.trigger	= bch2_subvolume_trigger,		\
23	.min_val_size	= 16,					\
24})
25
26int bch2_subvol_has_children(struct btree_trans *, u32);
27int bch2_subvolume_get(struct btree_trans *, unsigned,
28		       bool, int, struct bch_subvolume *);
29int __bch2_subvolume_get_snapshot(struct btree_trans *, u32,
30				  u32 *, bool);
31int bch2_subvolume_get_snapshot(struct btree_trans *, u32, u32 *);
32
33int bch2_subvol_is_ro_trans(struct btree_trans *, u32);
34int bch2_subvol_is_ro(struct bch_fs *, u32);
35
36static inline struct bkey_s_c
37bch2_btree_iter_peek_in_subvolume_upto_type(struct btree_iter *iter, struct bpos end,
38					    u32 subvolid, unsigned flags)
39{
40	u32 snapshot;
41	int ret = bch2_subvolume_get_snapshot(iter->trans, subvolid, &snapshot);
42	if (ret)
43		return bkey_s_c_err(ret);
44
45	bch2_btree_iter_set_snapshot(iter, snapshot);
46	return bch2_btree_iter_peek_upto_type(iter, end, flags);
47}
48
49#define for_each_btree_key_in_subvolume_upto_continue(_trans, _iter,		\
50					 _end, _subvolid, _flags, _k, _do)	\
51({										\
52	struct bkey_s_c _k;							\
53	int _ret3 = 0;								\
54										\
55	do {									\
56		_ret3 = lockrestart_do(_trans, ({				\
57			(_k) = bch2_btree_iter_peek_in_subvolume_upto_type(&(_iter),	\
58						_end, _subvolid, (_flags));	\
59			if (!(_k).k)						\
60				break;						\
61										\
62			bkey_err(_k) ?: (_do);					\
63		}));								\
64	} while (!_ret3 && bch2_btree_iter_advance(&(_iter)));			\
65										\
66	bch2_trans_iter_exit((_trans), &(_iter));				\
67	_ret3;									\
68})
69
70#define for_each_btree_key_in_subvolume_upto(_trans, _iter, _btree_id,		\
71				_start, _end, _subvolid, _flags, _k, _do)	\
72({										\
73	struct btree_iter _iter;						\
74	bch2_trans_iter_init((_trans), &(_iter), (_btree_id),			\
75			     (_start), (_flags));				\
76										\
77	for_each_btree_key_in_subvolume_upto_continue(_trans, _iter,		\
78					_end, _subvolid, _flags, _k, _do);	\
79})
80
81int bch2_delete_dead_snapshots(struct bch_fs *);
82void bch2_delete_dead_snapshots_async(struct bch_fs *);
83
84int bch2_subvolume_unlink(struct btree_trans *, u32);
85int bch2_subvolume_create(struct btree_trans *, u64, u32, u32, u32 *, u32 *, bool);
86
87int bch2_initialize_subvolumes(struct bch_fs *);
88int bch2_fs_upgrade_for_subvolumes(struct bch_fs *);
89
90int bch2_fs_subvolumes_init(struct bch_fs *);
91
92#endif /* _BCACHEFS_SUBVOLUME_H */