blob: 675a02184e177848b389ac2d1d15166695ee36d7
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * fstrim.c - discard the part (or whole) of mounted filesystem. |
4 | * |
5 | * 03 March 2012 - Malek Degachi <malek-degachi@laposte.net> |
6 | * Adapted for busybox from util-linux-2.12a. |
7 | * |
8 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
9 | */ |
10 | |
11 | //config:config FSTRIM |
12 | //config: bool "fstrim" |
13 | //config: default y |
14 | //config: select PLATFORM_LINUX |
15 | //config: help |
16 | //config: Discard unused blocks on a mounted filesystem. |
17 | |
18 | //applet:IF_FSTRIM(APPLET(fstrim, BB_DIR_SBIN, BB_SUID_DROP)) |
19 | |
20 | //kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o |
21 | |
22 | //usage:#define fstrim_trivial_usage |
23 | //usage: "[OPTIONS] MOUNTPOINT" |
24 | //usage:#define fstrim_full_usage "\n\n" |
25 | //usage: IF_LONG_OPTS( |
26 | //usage: " -o,--offset=OFFSET Offset in bytes to discard from" |
27 | //usage: "\n -l,--length=LEN Bytes to discard" |
28 | //usage: "\n -m,--minimum=MIN Minimum extent length" |
29 | //usage: "\n -v,--verbose Print number of discarded bytes" |
30 | //usage: ) |
31 | //usage: IF_NOT_LONG_OPTS( |
32 | //usage: " -o OFFSET Offset in bytes to discard from" |
33 | //usage: "\n -l LEN Bytes to discard" |
34 | //usage: "\n -m MIN Minimum extent length" |
35 | //usage: "\n -v, Print number of discarded bytes" |
36 | //usage: ) |
37 | |
38 | #include "libbb.h" |
39 | #include <linux/fs.h> |
40 | |
41 | #ifndef FITRIM |
42 | struct fstrim_range { |
43 | uint64_t start; |
44 | uint64_t len; |
45 | uint64_t minlen; |
46 | }; |
47 | #define FITRIM _IOWR('X', 121, struct fstrim_range) |
48 | #endif |
49 | |
50 | static const struct suffix_mult fstrim_sfx[] = { |
51 | { "KiB", 1024 }, |
52 | { "kiB", 1024 }, |
53 | { "K", 1024 }, |
54 | { "k", 1024 }, |
55 | { "MiB", 1048576 }, |
56 | { "miB", 1048576 }, |
57 | { "M", 1048576 }, |
58 | { "m", 1048576 }, |
59 | { "GiB", 1073741824 }, |
60 | { "giB", 1073741824 }, |
61 | { "G", 1073741824 }, |
62 | { "g", 1073741824 }, |
63 | { "KB", 1000 }, |
64 | { "MB", 1000000 }, |
65 | { "GB", 1000000000 }, |
66 | { "", 0 } |
67 | }; |
68 | |
69 | int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
70 | int fstrim_main(int argc UNUSED_PARAM, char **argv) |
71 | { |
72 | struct fstrim_range range; |
73 | char *arg_o, *arg_l, *arg_m, *mp; |
74 | unsigned opts; |
75 | int fd; |
76 | |
77 | enum { |
78 | OPT_o = (1 << 0), |
79 | OPT_l = (1 << 1), |
80 | OPT_m = (1 << 2), |
81 | OPT_v = (1 << 3), |
82 | }; |
83 | |
84 | #if ENABLE_LONG_OPTS |
85 | static const char getopt_longopts[] ALIGN1 = |
86 | "offset\0" Required_argument "o" |
87 | "length\0" Required_argument "l" |
88 | "minimum\0" Required_argument "m" |
89 | "verbose\0" No_argument "v" |
90 | ; |
91 | applet_long_options = getopt_longopts; |
92 | #endif |
93 | |
94 | opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */ |
95 | opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m); |
96 | |
97 | memset(&range, 0, sizeof(range)); |
98 | range.len = ULLONG_MAX; |
99 | |
100 | if (opts & OPT_o) |
101 | range.start = xatoull_sfx(arg_o, fstrim_sfx); |
102 | if (opts & OPT_l) |
103 | range.len = xatoull_sfx(arg_l, fstrim_sfx); |
104 | if (opts & OPT_m) |
105 | range.minlen = xatoull_sfx(arg_m, fstrim_sfx); |
106 | |
107 | mp = argv[optind]; |
108 | if (find_block_device(mp)) { |
109 | fd = xopen_nonblocking(mp); |
110 | xioctl(fd, FITRIM, &range); |
111 | if (ENABLE_FEATURE_CLEAN_UP) |
112 | close(fd); |
113 | |
114 | if (opts & OPT_v) |
115 | printf("%s: %llu bytes trimmed\n", mp, (unsigned long long)range.len); |
116 | return EXIT_SUCCESS; |
117 | } |
118 | return EXIT_FAILURE; |
119 | } |
120 |