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List: busybox
Subject: [PATCH] fstrim: new applet
From: souf <souf_oued () yahoo ! fr>
Date: 2012-03-24 13:06:37
Message-ID: 4F6DC6DD.4020203 () yahoo ! fr
[Download RAW message or body]
Hi list,
This patch adds a new applet: fstrim.
fstrim is used on a mounted filesystem to discard (or "trim") blocks
which are not in use by the filesystem. This is useful for solid-state
drives (SSDs) and thinly-provisioned storage.
function old new delta
.rodata 147233 147545 +312
fstrim_main - 276 +276
fstrim_sfx - 128 +128
packed_usage 28175 28251 +76
applet_main 2768 2776 +8
applet_names 2368 2375 +7
applet_nameofs 692 694 +2
applet_install_loc 173 174 +1
------------------------------------------------------------------------------
(add/remove: 3/0 grow/shrink: 6/0 up/down: 810/0) Total: 810 bytes
Regards.
["fstrim.patch" (text/x-patch)]
diff -U 3 -H -d -p -r -N -- busybox.orig/include/applets.src.h busybox/include/applets.src.h
--- busybox.orig/include/applets.src.h 2012-03-19 12:22:57.000000000 +0100
+++ busybox/include/applets.src.h 2012-03-20 21:15:15.639036183 +0100
@@ -161,6 +161,7 @@ IF_FSCK(APPLET(fsck, BB_DIR_SBIN, BB_SUI
//IF_E2FSCK(APPLET_ODDNAME(fsck.ext2, e2fsck, BB_DIR_SBIN, BB_SUID_DROP, fsck_ext2))
//IF_E2FSCK(APPLET_ODDNAME(fsck.ext3, e2fsck, BB_DIR_SBIN, BB_SUID_DROP, fsck_ext3))
IF_FSCK_MINIX(APPLET_ODDNAME(fsck.minix, fsck_minix, BB_DIR_SBIN, BB_SUID_DROP, fsck_minix))
+IF_FSTRIM(APPLET(fstrim, BB_DIR_SBIN, BB_SUID_DROP))
IF_FSYNC(APPLET_NOFORK(fsync, fsync, BB_DIR_BIN, BB_SUID_DROP, fsync))
IF_FTPD(APPLET(ftpd, BB_DIR_USR_SBIN, BB_SUID_DROP))
IF_FTPGET(APPLET_ODDNAME(ftpget, ftpgetput, BB_DIR_USR_BIN, BB_SUID_DROP, ftpget))
diff -U 3 -H -d -p -r -N -- busybox.orig/util-linux/Config.src busybox/util-linux/Config.src
--- busybox.orig/util-linux/Config.src 2012-03-19 12:22:57.000000000 +0100
+++ busybox/util-linux/Config.src 2012-03-20 21:12:03.619038140 +0100
@@ -246,6 +246,13 @@ config FSCK_MINIX
check for and attempt to repair any corruption that occurs to a minix
filesystem.
+config FSTRIM
+ bool "fstrim"
+ default y
+ select PLATFORM_LINUX
+ help
+ discard unused blocks on a mounted filesystem.
+
config MKFS_EXT2
bool "mkfs_ext2"
default y
diff -U 3 -H -d -p -r -N -- busybox.orig/util-linux/Kbuild.src busybox/util-linux/Kbuild.src
--- busybox.orig/util-linux/Kbuild.src 2012-03-19 12:22:57.000000000 +0100
+++ busybox/util-linux/Kbuild.src 2012-03-20 21:13:04.175037526 +0100
@@ -18,6 +18,7 @@ lib-$(CONFIG_FINDFS) += findf
lib-$(CONFIG_FLOCK) += flock.o
lib-$(CONFIG_FREERAMDISK) += freeramdisk.o
lib-$(CONFIG_FSCK_MINIX) += fsck_minix.o
+lib-$(CONFIG_FSTRIM) += fstrim.o
lib-$(CONFIG_GETOPT) += getopt.o
lib-$(CONFIG_HEXDUMP) += hexdump.o
lib-$(CONFIG_HWCLOCK) += hwclock.o
diff -U 3 -H -d -p -r -N -- busybox.orig/util-linux/fstrim.c busybox/util-linux/fstrim.c
--- busybox.orig/util-linux/fstrim.c 1970-01-01 01:00:00.000000000 +0100
+++ busybox/util-linux/fstrim.c 2012-03-20 20:36:14.000000000 +0100
@@ -0,0 +1,116 @@
+/* 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";
+ 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);
+ close(fd);
+
+ if (opts & OPT_v)
+ printf("%s: %llu bytes was trimmed\n", argv[optind], range.len);
+// printf("%s: %s bytes was trimmed\n", argv[optind], make_human_readable_str(range.len, 1, 0));
+ }
+
+ return EXIT_SUCCESS;
+}
+
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