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