1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | |
3 | #ifndef BTRFS_INODE_ITEM_H |
4 | #define BTRFS_INODE_ITEM_H |
5 | |
6 | #include <linux/types.h> |
7 | #include <linux/crc32c.h> |
8 | |
9 | struct fscrypt_str; |
10 | struct extent_buffer; |
11 | struct btrfs_trans_handle; |
12 | struct btrfs_root; |
13 | struct btrfs_path; |
14 | struct btrfs_key; |
15 | struct btrfs_inode_extref; |
16 | struct btrfs_inode; |
17 | struct btrfs_truncate_control; |
18 | |
19 | /* |
20 | * Return this if we need to call truncate_block for the last bit of the |
21 | * truncate. |
22 | */ |
23 | #define BTRFS_NEED_TRUNCATE_BLOCK 1 |
24 | |
25 | struct btrfs_truncate_control { |
26 | /* |
27 | * IN: the inode we're operating on, this can be NULL if |
28 | * ->clear_extent_range is false. |
29 | */ |
30 | struct btrfs_inode *inode; |
31 | |
32 | /* IN: the size we're truncating to. */ |
33 | u64 new_size; |
34 | |
35 | /* OUT: the number of extents truncated. */ |
36 | u64 extents_found; |
37 | |
38 | /* OUT: the last size we truncated this inode to. */ |
39 | u64 last_size; |
40 | |
41 | /* OUT: the number of bytes to sub from this inode. */ |
42 | u64 sub_bytes; |
43 | |
44 | /* IN: the ino we are truncating. */ |
45 | u64 ino; |
46 | |
47 | /* |
48 | * IN: minimum key type to remove. All key types with this type are |
49 | * removed only if their offset >= new_size. |
50 | */ |
51 | u32 min_type; |
52 | |
53 | /* |
54 | * IN: true if we don't want to do extent reference updates for any file |
55 | * extents we drop. |
56 | */ |
57 | bool skip_ref_updates; |
58 | |
59 | /* |
60 | * IN: true if we need to clear the file extent range for the inode as |
61 | * we drop the file extent items. |
62 | */ |
63 | bool clear_extent_range; |
64 | }; |
65 | |
66 | /* |
67 | * btrfs_inode_item stores flags in a u64, btrfs_inode stores them in two |
68 | * separate u32s. These two functions convert between the two representations. |
69 | */ |
70 | static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags) |
71 | { |
72 | return (flags | ((u64)ro_flags << 32)); |
73 | } |
74 | |
75 | static inline void btrfs_inode_split_flags(u64 inode_item_flags, |
76 | u32 *flags, u32 *ro_flags) |
77 | { |
78 | *flags = (u32)inode_item_flags; |
79 | *ro_flags = (u32)(inode_item_flags >> 32); |
80 | } |
81 | |
82 | /* Figure the key offset of an extended inode ref. */ |
83 | static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len) |
84 | { |
85 | return (u64)crc32c(crc: parent_objectid, address: name, length: len); |
86 | } |
87 | |
88 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
89 | struct btrfs_root *root, |
90 | struct btrfs_truncate_control *control); |
91 | int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans, |
92 | struct btrfs_root *root, const struct fscrypt_str *name, |
93 | u64 inode_objectid, u64 ref_objectid, u64 index); |
94 | int btrfs_del_inode_ref(struct btrfs_trans_handle *trans, |
95 | struct btrfs_root *root, const struct fscrypt_str *name, |
96 | u64 inode_objectid, u64 ref_objectid, u64 *index); |
97 | int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, |
98 | struct btrfs_root *root, |
99 | struct btrfs_path *path, u64 objectid); |
100 | int btrfs_lookup_inode(struct btrfs_trans_handle *trans, |
101 | struct btrfs_root *root, struct btrfs_path *path, |
102 | struct btrfs_key *location, int mod); |
103 | |
104 | struct btrfs_inode_extref *btrfs_lookup_inode_extref( |
105 | struct btrfs_trans_handle *trans, |
106 | struct btrfs_root *root, |
107 | struct btrfs_path *path, |
108 | const struct fscrypt_str *name, |
109 | u64 inode_objectid, u64 ref_objectid, int ins_len, |
110 | int cow); |
111 | |
112 | struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf, |
113 | int slot, |
114 | const struct fscrypt_str *name); |
115 | struct btrfs_inode_extref *btrfs_find_name_in_ext_backref( |
116 | struct extent_buffer *leaf, int slot, u64 ref_objectid, |
117 | const struct fscrypt_str *name); |
118 | |
119 | #endif |
120 | |