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Linux kernel mirror (for testing)
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1
2/* TODO merge/factor into tools/lib/lk/debugfs.c */
3
4#include "util.h"
5#include "util/fs.h"
6
7static const char * const sysfs__fs_known_mountpoints[] = {
8 "/sys",
9 0,
10};
11
12static const char * const procfs__known_mountpoints[] = {
13 "/proc",
14 0,
15};
16
17struct fs {
18 const char *name;
19 const char * const *mounts;
20 char path[PATH_MAX + 1];
21 bool found;
22 long magic;
23};
24
25enum {
26 FS__SYSFS = 0,
27 FS__PROCFS = 1,
28};
29
30static struct fs fs__entries[] = {
31 [FS__SYSFS] = {
32 .name = "sysfs",
33 .mounts = sysfs__fs_known_mountpoints,
34 .magic = SYSFS_MAGIC,
35 },
36 [FS__PROCFS] = {
37 .name = "proc",
38 .mounts = procfs__known_mountpoints,
39 .magic = PROC_SUPER_MAGIC,
40 },
41};
42
43static bool fs__read_mounts(struct fs *fs)
44{
45 bool found = false;
46 char type[100];
47 FILE *fp;
48
49 fp = fopen("/proc/mounts", "r");
50 if (fp == NULL)
51 return NULL;
52
53 while (!found &&
54 fscanf(fp, "%*s %" STR(PATH_MAX) "s %99s %*s %*d %*d\n",
55 fs->path, type) == 2) {
56
57 if (strcmp(type, fs->name) == 0)
58 found = true;
59 }
60
61 fclose(fp);
62 return fs->found = found;
63}
64
65static int fs__valid_mount(const char *fs, long magic)
66{
67 struct statfs st_fs;
68
69 if (statfs(fs, &st_fs) < 0)
70 return -ENOENT;
71 else if (st_fs.f_type != magic)
72 return -ENOENT;
73
74 return 0;
75}
76
77static bool fs__check_mounts(struct fs *fs)
78{
79 const char * const *ptr;
80
81 ptr = fs->mounts;
82 while (*ptr) {
83 if (fs__valid_mount(*ptr, fs->magic) == 0) {
84 fs->found = true;
85 strcpy(fs->path, *ptr);
86 return true;
87 }
88 ptr++;
89 }
90
91 return false;
92}
93
94static const char *fs__get_mountpoint(struct fs *fs)
95{
96 if (fs__check_mounts(fs))
97 return fs->path;
98
99 return fs__read_mounts(fs) ? fs->path : NULL;
100}
101
102static const char *fs__mountpoint(int idx)
103{
104 struct fs *fs = &fs__entries[idx];
105
106 if (fs->found)
107 return (const char *)fs->path;
108
109 return fs__get_mountpoint(fs);
110}
111
112#define FS__MOUNTPOINT(name, idx) \
113const char *name##__mountpoint(void) \
114{ \
115 return fs__mountpoint(idx); \
116}
117
118FS__MOUNTPOINT(sysfs, FS__SYSFS);
119FS__MOUNTPOINT(procfs, FS__PROCFS);