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Commit | Line | Data |
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4299a549 JO |
1 | |
2 | /* TODO merge/factor into tools/lib/lk/debugfs.c */ | |
3 | ||
4 | #include "util.h" | |
5 | #include "util/fs.h" | |
6 | ||
7 | static const char * const sysfs__fs_known_mountpoints[] = { | |
8 | "/sys", | |
9 | 0, | |
10 | }; | |
11 | ||
a9862418 JO |
12 | static const char * const procfs__known_mountpoints[] = { |
13 | "/proc", | |
14 | 0, | |
15 | }; | |
16 | ||
4299a549 JO |
17 | struct fs { |
18 | const char *name; | |
19 | const char * const *mounts; | |
20 | char path[PATH_MAX + 1]; | |
21 | bool found; | |
22 | long magic; | |
23 | }; | |
24 | ||
25 | enum { | |
a9862418 JO |
26 | FS__SYSFS = 0, |
27 | FS__PROCFS = 1, | |
4299a549 JO |
28 | }; |
29 | ||
30 | static struct fs fs__entries[] = { | |
31 | [FS__SYSFS] = { | |
32 | .name = "sysfs", | |
33 | .mounts = sysfs__fs_known_mountpoints, | |
34 | .magic = SYSFS_MAGIC, | |
35 | }, | |
a9862418 JO |
36 | [FS__PROCFS] = { |
37 | .name = "proc", | |
38 | .mounts = procfs__known_mountpoints, | |
39 | .magic = PROC_SUPER_MAGIC, | |
40 | }, | |
4299a549 JO |
41 | }; |
42 | ||
43 | static 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 | ||
65 | static 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 | ||
77 | static 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 | ||
94 | static 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 | ||
cf38fada | 102 | static const char *fs__mountpoint(int idx) |
4299a549 JO |
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 | ||
cf38fada ACM |
112 | #define FS__MOUNTPOINT(name, idx) \ |
113 | const char *name##__mountpoint(void) \ | |
114 | { \ | |
115 | return fs__mountpoint(idx); \ | |
4299a549 JO |
116 | } |
117 | ||
a9862418 JO |
118 | FS__MOUNTPOINT(sysfs, FS__SYSFS); |
119 | FS__MOUNTPOINT(procfs, FS__PROCFS); |