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
9struct fscrypt_str;
10struct extent_buffer;
11struct btrfs_trans_handle;
12struct btrfs_root;
13struct btrfs_path;
14struct btrfs_key;
15struct btrfs_inode_extref;
16struct btrfs_inode;
17struct 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
25struct 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 */
70static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags)
71{
72 return (flags | ((u64)ro_flags << 32));
73}
74
75static 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. */
83static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len)
84{
85 return (u64)crc32c(crc: parent_objectid, p: name, len);
86}
87
88int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
89 struct btrfs_root *root,
90 struct btrfs_truncate_control *control);
91int 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);
94int 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);
97int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
98 struct btrfs_root *root,
99 struct btrfs_path *path, u64 objectid);
100int 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
104struct btrfs_inode_extref *btrfs_lookup_inode_extref(struct btrfs_root *root,
105 struct btrfs_path *path,
106 const struct fscrypt_str *name,
107 u64 inode_objectid, u64 ref_objectid);
108
109struct btrfs_inode_ref *btrfs_find_name_in_backref(const struct extent_buffer *leaf,
110 int slot,
111 const struct fscrypt_str *name);
112struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
113 const struct extent_buffer *leaf, int slot, u64 ref_objectid,
114 const struct fscrypt_str *name);
115
116#endif
117

source code of linux/fs/btrfs/inode-item.h