1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _BCACHEFS_DIRENT_H
3 #define _BCACHEFS_DIRENT_H
4 
5 #include "str_hash.h"
6 
7 extern const struct bch_hash_desc bch2_dirent_hash_desc;
8 
9 int bch2_dirent_validate(struct bch_fs *, struct bkey_s_c,
10 			 struct bkey_validate_context);
11 void bch2_dirent_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
12 
13 #define bch2_bkey_ops_dirent ((struct bkey_ops) {	\
14 	.key_validate	= bch2_dirent_validate,		\
15 	.val_to_text	= bch2_dirent_to_text,		\
16 	.min_val_size	= 16,				\
17 })
18 
19 struct qstr;
20 struct file;
21 struct dir_context;
22 struct bch_fs;
23 struct bch_hash_info;
24 struct bch_inode_info;
25 
26 int bch2_casefold(struct btree_trans *, const struct bch_hash_info *,
27 		  const struct qstr *, struct qstr *);
28 
29 static inline int bch2_maybe_casefold(struct btree_trans *trans,
30 				      const struct bch_hash_info *info,
31 				      const struct qstr *str, struct qstr *out_cf)
32 {
33 	if (likely(!info->cf_encoding)) {
34 		*out_cf = *str;
35 		return 0;
36 	} else {
37 		return bch2_casefold(trans, info, str, out_cf);
38 	}
39 }
40 
41 struct qstr bch2_dirent_get_name(struct bkey_s_c_dirent d);
42 
43 static inline unsigned dirent_val_u64s(unsigned len, unsigned cf_len)
44 {
45 	unsigned bytes = cf_len
46 		? offsetof(struct bch_dirent, d_cf_name_block.d_names) + len + cf_len
47 		: offsetof(struct bch_dirent, d_name) + len;
48 
49 	return DIV_ROUND_UP(bytes, sizeof(u64));
50 }
51 
52 int bch2_dirent_read_target(struct btree_trans *, subvol_inum,
53 			    struct bkey_s_c_dirent, subvol_inum *);
54 
55 static inline void dirent_copy_target(struct bkey_i_dirent *dst,
56 				      struct bkey_s_c_dirent src)
57 {
58 	dst->v.d_inum = src.v->d_inum;
59 	dst->v.d_type = src.v->d_type;
60 }
61 
62 int bch2_dirent_create_snapshot(struct btree_trans *, u32, u64, u32,
63 			const struct bch_hash_info *, u8,
64 			const struct qstr *, u64, u64 *,
65 			enum btree_iter_update_trigger_flags);
66 int bch2_dirent_create(struct btree_trans *, subvol_inum,
67 		       const struct bch_hash_info *, u8,
68 		       const struct qstr *, u64, u64 *,
69 		       enum btree_iter_update_trigger_flags);
70 
71 static inline unsigned vfs_d_type(unsigned type)
72 {
73 	return type == DT_SUBVOL ? DT_DIR : type;
74 }
75 
76 enum bch_rename_mode {
77 	BCH_RENAME,
78 	BCH_RENAME_OVERWRITE,
79 	BCH_RENAME_EXCHANGE,
80 };
81 
82 int bch2_dirent_rename(struct btree_trans *,
83 		       subvol_inum, struct bch_hash_info *, u64 *,
84 		       subvol_inum, struct bch_hash_info *, u64 *,
85 		       const struct qstr *, subvol_inum *, u64 *,
86 		       const struct qstr *, subvol_inum *, u64 *,
87 		       enum bch_rename_mode);
88 
89 int bch2_dirent_lookup_trans(struct btree_trans *, struct btree_iter *,
90 			       subvol_inum, const struct bch_hash_info *,
91 			       const struct qstr *, subvol_inum *, unsigned);
92 u64 bch2_dirent_lookup(struct bch_fs *, subvol_inum,
93 		       const struct bch_hash_info *,
94 		       const struct qstr *, subvol_inum *);
95 
96 int bch2_empty_dir_snapshot(struct btree_trans *, u64, u32, u32);
97 int bch2_empty_dir_trans(struct btree_trans *, subvol_inum);
98 int bch2_readdir(struct bch_fs *, subvol_inum, struct dir_context *);
99 
100 int bch2_fsck_remove_dirent(struct btree_trans *, struct bpos);
101 
102 #endif /* _BCACHEFS_DIRENT_H */
103