1 files changed, 119 insertions, 0 deletions

diff --git a/util-linux/fstrim.c b/util-linux/fstrim.c
new file mode 100644
index 000000000..675a02184
--- /dev/null
+++ b/util-linux/fstrim.c
@@ -0,0 +1,119 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * fstrim.c - discard the part (or whole) of mounted filesystem.
+ *
+ * 03 March 2012 - Malek Degachi <malek-degachi@laposte.net>
+ * Adapted for busybox from util-linux-2.12a.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+//config:config FSTRIM
+//config:       bool "fstrim"
+//config:       default y
+//config:       select PLATFORM_LINUX
+//config:       help
+//config:         Discard unused blocks on a mounted filesystem.
+
+//applet:IF_FSTRIM(APPLET(fstrim, BB_DIR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_FSTRIM) += fstrim.o
+
+//usage:#define fstrim_trivial_usage
+//usage:       "[OPTIONS] MOUNTPOINT"
+//usage:#define fstrim_full_usage "\n\n"
+//usage:        IF_LONG_OPTS(
+//usage:       "        -o,--offset=OFFSET      Offset in bytes to discard from"
+//usage:     "\n        -l,--length=LEN         Bytes to discard"
+//usage:     "\n        -m,--minimum=MIN        Minimum extent length"
+//usage:     "\n        -v,--verbose            Print number of discarded bytes"
+//usage:        )
+//usage:        IF_NOT_LONG_OPTS(
+//usage:       "        -o OFFSET       Offset in bytes to discard from"
+//usage:     "\n        -l LEN          Bytes to discard"
+//usage:     "\n        -m MIN          Minimum extent length"
+//usage:     "\n        -v,             Print number of discarded bytes"
+//usage:        )
+
+#include "libbb.h"
+#include <linux/fs.h>
+
+#ifndef FITRIM
+struct fstrim_range {
+        uint64_t start;
+        uint64_t len;
+        uint64_t minlen;
+};
+#define FITRIM          _IOWR('X', 121, struct fstrim_range)
+#endif
+
+static const struct suffix_mult fstrim_sfx[] = {
+        { "KiB", 1024 },
+        { "kiB", 1024 },
+        { "K", 1024 },
+        { "k", 1024 },
+        { "MiB", 1048576 },
+        { "miB", 1048576 },
+        { "M", 1048576 },
+        { "m", 1048576 },
+        { "GiB", 1073741824 },
+        { "giB", 1073741824 },
+        { "G", 1073741824 },
+        { "g", 1073741824 },
+        { "KB", 1000 },
+        { "MB", 1000000 },
+        { "GB", 1000000000 },
+        { "", 0 }
+};
+
+int fstrim_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int fstrim_main(int argc UNUSED_PARAM, char **argv)
+{
+        struct fstrim_range range;
+        char *arg_o, *arg_l, *arg_m, *mp;
+        unsigned opts;
+        int fd;
+
+        enum {
+                OPT_o = (1 << 0),
+                OPT_l = (1 << 1),
+                OPT_m = (1 << 2),
+                OPT_v = (1 << 3),
+        };
+
+#if ENABLE_LONG_OPTS
+        static const char getopt_longopts[] ALIGN1 =
+                "offset\0"    Required_argument    "o"
+                "length\0"    Required_argument    "l"
+                "minimum\0"   Required_argument    "m"
+                "verbose\0"   No_argument          "v"
+                ;
+        applet_long_options = getopt_longopts;
+#endif
+
+        opt_complementary = "=1"; /* exactly one non-option arg: the mountpoint */
+        opts = getopt32(argv, "o:l:m:v", &arg_o, &arg_l, &arg_m);
+
+        memset(&range, 0, sizeof(range));
+        range.len = ULLONG_MAX;
+
+        if (opts & OPT_o)
+                range.start = xatoull_sfx(arg_o, fstrim_sfx);
+        if (opts & OPT_l)
+                range.len = xatoull_sfx(arg_l, fstrim_sfx);
+        if (opts & OPT_m)
+                range.minlen = xatoull_sfx(arg_m, fstrim_sfx);
+
+        mp = argv[optind];
+        if (find_block_device(mp)) {
+                fd = xopen_nonblocking(mp);
+                xioctl(fd, FITRIM, &range);
+                if (ENABLE_FEATURE_CLEAN_UP)
+                        close(fd);
+
+                if (opts & OPT_v)
+                        printf("%s: %llu bytes trimmed\n", mp, (unsigned long long)range.len);
+                return EXIT_SUCCESS;
+        }
+        return EXIT_FAILURE;
+}