fstrim: New applet
fstrim applet is a port from util-linux.
"Trimming" your NAND/eMMC storage will restore the write performance
back to normal after having slow down issues on sequential write and
random write due to usage over time.
Good reading on subject:
http://forum.xda-developers.com/showthread.php?t=1971852
(with long options and CLEAN_UP turned on)
function old new delta
.rodata 148494 148791 +297
fstrim_main - 283 +283
fstrim_sfx - 128 +128
packed_usage 28826 28903 +77
applet_main 2760 2768 +8
applet_names 2343 2350 +7
applet_nameofs 690 692 +2
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 5/0 up/down: 802/0) Total: 802 bytes
Signed-off-by: Malek Degachi <malek-degachi@laposte.net>
Cc: Eugene San (eugenesan) <eugenesan@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
diff --git a/util-linux/fstrim.c b/util-linux/fstrim.c
new file mode 100644
index 0000000..2fa457b
--- /dev/null
+++ b/util-linux/fstrim.c
@@ -0,0 +1,111 @@
+/* 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.
+ */
+
+//usage:#define fstrim_trivial_usage
+//usage: "[Options] <mountpoint>"
+//usage:#define fstrim_full_usage "\n\n"
+//usage: "Options:"
+//usage: IF_LONG_OPTS(
+//usage: "\n -o,--offset=offset offset in bytes to discard from"
+//usage: "\n -l,--length=length length of bytes to discard from the offset"
+//usage: "\n -m,--minimum=minimum minimum extent length to discard"
+//usage: "\n -v,--verbose print number of discarded bytes"
+//usage: )
+//usage: IF_NOT_LONG_OPTS(
+//usage: "\n -o offset offset in bytes to discard from"
+//usage: "\n -l length length of bytes to discard from the offset"
+//usage: "\n -m minimum minimum extent length to discard"
+//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;
+ char *arg_l;
+ char *arg_m;
+ 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);
+
+ if (find_block_device(argv[optind])) {
+ fd = xopen_nonblocking(argv[optind]);
+ xioctl(fd, FITRIM, &range);
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(fd);
+
+ if (opts & OPT_v)
+ printf("%s: %llu bytes were trimmed\n", argv[optind], range.len);
+ }
+
+ return EXIT_SUCCESS;
+}
+