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