1// SPDX-License-Identifier: GPL-2.0
2#include <linux/fs.h>
3#include <linux/export.h>
4
5/*
6 * fs on-disk file type to dirent file type conversion
7 */
8static const unsigned char fs_dtype_by_ftype[FT_MAX] = {
9 [FT_UNKNOWN] = DT_UNKNOWN,
10 [FT_REG_FILE] = DT_REG,
11 [FT_DIR] = DT_DIR,
12 [FT_CHRDEV] = DT_CHR,
13 [FT_BLKDEV] = DT_BLK,
14 [FT_FIFO] = DT_FIFO,
15 [FT_SOCK] = DT_SOCK,
16 [FT_SYMLINK] = DT_LNK
17};
18
19/**
20 * fs_ftype_to_dtype() - fs on-disk file type to dirent type.
21 * @filetype: The on-disk file type to convert.
22 *
23 * This function converts the on-disk file type value (FT_*) to the directory
24 * entry type (DT_*).
25 *
26 * Context: Any context.
27 * Return:
28 * * DT_UNKNOWN - Unknown type
29 * * DT_FIFO - FIFO
30 * * DT_CHR - Character device
31 * * DT_DIR - Directory
32 * * DT_BLK - Block device
33 * * DT_REG - Regular file
34 * * DT_LNK - Symbolic link
35 * * DT_SOCK - Local-domain socket
36 */
37unsigned char fs_ftype_to_dtype(unsigned int filetype)
38{
39 if (filetype >= FT_MAX)
40 return DT_UNKNOWN;
41
42 return fs_dtype_by_ftype[filetype];
43}
44EXPORT_SYMBOL_GPL(fs_ftype_to_dtype);
45
46/*
47 * dirent file type to fs on-disk file type conversion
48 * Values not initialized explicitly are FT_UNKNOWN (0).
49 */
50static const unsigned char fs_ftype_by_dtype[DT_MAX] = {
51 [DT_REG] = FT_REG_FILE,
52 [DT_DIR] = FT_DIR,
53 [DT_LNK] = FT_SYMLINK,
54 [DT_CHR] = FT_CHRDEV,
55 [DT_BLK] = FT_BLKDEV,
56 [DT_FIFO] = FT_FIFO,
57 [DT_SOCK] = FT_SOCK,
58};
59
60/**
61 * fs_umode_to_ftype() - file mode to on-disk file type.
62 * @mode: The file mode to convert.
63 *
64 * This function converts the file mode value to the on-disk file type (FT_*).
65 *
66 * Context: Any context.
67 * Return:
68 * * FT_UNKNOWN - Unknown type
69 * * FT_REG_FILE - Regular file
70 * * FT_DIR - Directory
71 * * FT_CHRDEV - Character device
72 * * FT_BLKDEV - Block device
73 * * FT_FIFO - FIFO
74 * * FT_SOCK - Local-domain socket
75 * * FT_SYMLINK - Symbolic link
76 */
77unsigned char fs_umode_to_ftype(umode_t mode)
78{
79 return fs_ftype_by_dtype[S_DT(mode)];
80}
81EXPORT_SYMBOL_GPL(fs_umode_to_ftype);
82
83/**
84 * fs_umode_to_dtype() - file mode to dirent file type.
85 * @mode: The file mode to convert.
86 *
87 * This function converts the file mode value to the directory
88 * entry type (DT_*).
89 *
90 * Context: Any context.
91 * Return:
92 * * DT_UNKNOWN - Unknown type
93 * * DT_FIFO - FIFO
94 * * DT_CHR - Character device
95 * * DT_DIR - Directory
96 * * DT_BLK - Block device
97 * * DT_REG - Regular file
98 * * DT_LNK - Symbolic link
99 * * DT_SOCK - Local-domain socket
100 */
101unsigned char fs_umode_to_dtype(umode_t mode)
102{
103 return fs_ftype_to_dtype(fs_umode_to_ftype(mode));
104}
105EXPORT_SYMBOL_GPL(fs_umode_to_dtype);
106