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1 | #include "c.h" | |
2 | #include "pathnames.h" | |
3 | #include "xalloc.h" | |
4 | #include "nls.h" | |
5 | ||
6 | #include <libmount.h> | |
7 | ||
8 | #include "lsblk.h" | |
9 | ||
10 | static struct libmnt_table *mtab, *swaps; | |
11 | static struct libmnt_cache *mntcache; | |
12 | ||
13 | static int table_parser_errcb(struct libmnt_table *tb __attribute__((__unused__)), | |
14 | const char *filename, int line) | |
15 | { | |
16 | if (filename) | |
17 | warnx(_("%s: parse error at line %d -- ignored"), filename, line); | |
18 | return 1; | |
19 | } | |
20 | ||
21 | static int is_active_swap(const char *filename) | |
22 | { | |
23 | if (!swaps) { | |
24 | swaps = mnt_new_table(); | |
25 | if (!swaps) | |
26 | return 0; | |
27 | if (!mntcache) | |
28 | mntcache = mnt_new_cache(); | |
29 | ||
30 | mnt_table_set_parser_errcb(swaps, table_parser_errcb); | |
31 | mnt_table_set_cache(swaps, mntcache); | |
32 | ||
33 | if (!lsblk->sysroot) | |
34 | mnt_table_parse_swaps(swaps, NULL); | |
35 | else { | |
36 | char buf[PATH_MAX]; | |
37 | snprintf(buf, sizeof(buf), "%s" _PATH_PROC_SWAPS, lsblk->sysroot); | |
38 | mnt_table_parse_swaps(swaps, buf); | |
39 | } | |
40 | } | |
41 | ||
42 | return mnt_table_find_srcpath(swaps, filename, MNT_ITER_BACKWARD) != NULL; | |
43 | } | |
44 | ||
45 | char *lsblk_device_get_mountpoint(struct lsblk_device *dev) | |
46 | { | |
47 | struct libmnt_fs *fs; | |
48 | const char *fsroot; | |
49 | ||
50 | assert(dev); | |
51 | assert(dev->filename); | |
52 | ||
53 | if (dev->is_mounted || dev->is_swap) | |
54 | return dev->mountpoint; | |
55 | ||
56 | if (!mtab) { | |
57 | mtab = mnt_new_table(); | |
58 | if (!mtab) | |
59 | return NULL; | |
60 | if (!mntcache) | |
61 | mntcache = mnt_new_cache(); | |
62 | ||
63 | mnt_table_set_parser_errcb(mtab, table_parser_errcb); | |
64 | mnt_table_set_cache(mtab, mntcache); | |
65 | ||
66 | if (!lsblk->sysroot) | |
67 | mnt_table_parse_mtab(mtab, NULL); | |
68 | else { | |
69 | char buf[PATH_MAX]; | |
70 | snprintf(buf, sizeof(buf), "%s" _PATH_PROC_MOUNTINFO, lsblk->sysroot); | |
71 | mnt_table_parse_mtab(mtab, buf); | |
72 | } | |
73 | } | |
74 | ||
75 | /* Note that maj:min in /proc/self/mountinfo does not have to match with | |
76 | * devno as returned by stat(), so we have to try devname too | |
77 | */ | |
78 | fs = mnt_table_find_devno(mtab, makedev(dev->maj, dev->min), MNT_ITER_BACKWARD); | |
79 | if (!fs) | |
80 | fs = mnt_table_find_srcpath(mtab, dev->filename, MNT_ITER_BACKWARD); | |
81 | if (!fs) { | |
82 | if (is_active_swap(dev->filename)) { | |
83 | dev->mountpoint = xstrdup("[SWAP]"); | |
84 | dev->is_swap = 1; | |
85 | } else | |
86 | dev->mountpoint = NULL; | |
87 | ||
88 | return dev->mountpoint; | |
89 | } | |
90 | ||
91 | /* found */ | |
92 | fsroot = mnt_fs_get_root(fs); | |
93 | if (fsroot && strcmp(fsroot, "/") != 0) { | |
94 | /* hmm.. we found bind mount or btrfs subvolume, let's try to | |
95 | * get real FS root mountpoint */ | |
96 | struct libmnt_fs *rfs; | |
97 | struct libmnt_iter *itr = mnt_new_iter(MNT_ITER_BACKWARD); | |
98 | ||
99 | mnt_table_set_iter(mtab, itr, fs); | |
100 | while (mnt_table_next_fs(mtab, itr, &rfs) == 0) { | |
101 | fsroot = mnt_fs_get_root(rfs); | |
102 | if ((!fsroot || strcmp(fsroot, "/") == 0) | |
103 | && mnt_fs_match_source(rfs, dev->filename, mntcache)) { | |
104 | fs = rfs; | |
105 | break; | |
106 | } | |
107 | } | |
108 | mnt_free_iter(itr); | |
109 | } | |
110 | ||
111 | DBG(DEV, ul_debugobj(dev, "mountpoint: %s", mnt_fs_get_target(fs))); | |
112 | dev->mountpoint = xstrdup(mnt_fs_get_target(fs)); | |
113 | dev->is_mounted = 1; | |
114 | return dev->mountpoint; | |
115 | } | |
116 | ||
117 | void lsblk_mnt_init(void) | |
118 | { | |
119 | mnt_init_debug(0); | |
120 | } | |
121 | ||
122 | void lsblk_mnt_deinit(void) | |
123 | { | |
124 | mnt_unref_table(mtab); | |
125 | mnt_unref_table(swaps); | |
126 | mnt_unref_cache(mntcache); | |
127 | } |