xref: /linux/fs/bcachefs/subvolume.h (revision 55d0969c451159cff86949b38c39171cab962069)
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 enum bch_validate_flags;
9 
10 int bch2_check_subvols(struct bch_fs *);
11 int bch2_check_subvol_children(struct bch_fs *);
12 
13 int bch2_subvolume_validate(struct bch_fs *, struct bkey_s_c, enum bch_validate_flags);
14 void bch2_subvolume_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
15 int 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 
26 int bch2_subvol_has_children(struct btree_trans *, u32);
27 int bch2_subvolume_get(struct btree_trans *, unsigned,
28 		       bool, int, struct bch_subvolume *);
29 int __bch2_subvolume_get_snapshot(struct btree_trans *, u32,
30 				  u32 *, bool);
31 int bch2_subvolume_get_snapshot(struct btree_trans *, u32, u32 *);
32 
33 int bch2_subvol_is_ro_trans(struct btree_trans *, u32);
34 int bch2_subvol_is_ro(struct bch_fs *, u32);
35 
36 static inline struct bkey_s_c
37 bch2_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 
81 int bch2_delete_dead_snapshots(struct bch_fs *);
82 void bch2_delete_dead_snapshots_async(struct bch_fs *);
83 
84 int bch2_subvolume_unlink(struct btree_trans *, u32);
85 int bch2_subvolume_create(struct btree_trans *, u64, u32, u32, u32 *, u32 *, bool);
86 
87 int bch2_initialize_subvolumes(struct bch_fs *);
88 int bch2_fs_upgrade_for_subvolumes(struct bch_fs *);
89 
90 int bch2_fs_subvolumes_init(struct bch_fs *);
91 
92 #endif /* _BCACHEFS_SUBVOLUME_H */
93