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List:       busybox
Subject:    [PACTH] fsync
From:       Pekka Pessi <Pekka.Pessi () nokia ! com>
Date:       2008-08-29 13:25:36
Message-ID: 87bpzc2bsf.fsf () future ! research ! nokia ! com
[Download RAW message or body]

Hello,

Here is fsync shell utility that makes life easier and faster on
nosync (ubifs) mounts.

--Pekka


[Attachment #3 (text/x-diff)]

Index: busybox/coreutils/fsync.c
===================================================================
--- busybox/coreutils/fsync.c	(revision 0)
+++ busybox/coreutils/fsync.c	(revision 0)
@@ -0,0 +1,46 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini sync implementation for busybox
+ *
+ * Copyright (C) 2008 Nokia Corporation. All rights reserved.
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+#include "libbb.h"
+
+/* This is a NOFORK applet. Be very careful! */
+
+int fsync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int fsync_main(int argc, char **argv)
+{
+	int status = EXIT_SUCCESS;
+	int flags;
+	int fd;
+	char *path;
+
+	flags = getopt32(argv, "d"); /* fdatasync */
+	argv += optind;
+
+	if (!*argv) {
+		bb_show_usage();
+	}
+
+	for (path = *argv++; path; path = *argv++) {
+		fd = open(path, O_NOATIME | O_NOCTTY | O_RDONLY);
+
+		if (fd == -1) {
+			bb_simple_perror_msg(path);
+			status = EXIT_FAILURE;
+			continue;
+		}
+		
+		if ((flags ? fdatasync(fd) : fsync(fd)) == -1) {
+			bb_simple_perror_msg(path);
+		}
+
+		close(fd);
+	}
+
+	return status;
+}
Index: busybox/coreutils/Kbuild
===================================================================
--- busybox/coreutils/Kbuild	(revision 23238)
+++ busybox/coreutils/Kbuild	(working copy)
@@ -36,6 +36,7 @@
 lib-$(CONFIG_EXPAND)    += expand.o
 lib-$(CONFIG_FALSE)     += false.o
 lib-$(CONFIG_FOLD)      += fold.o
+lib-$(CONFIG_FSYNC)     += fsync.o
 lib-$(CONFIG_HEAD)      += head.o
 lib-$(CONFIG_HOSTID)    += hostid.o
 lib-$(CONFIG_ID)        += id.o
Index: busybox/coreutils/Config.in
===================================================================
--- busybox/coreutils/Config.in	(revision 23238)
+++ busybox/coreutils/Config.in	(working copy)
@@ -249,6 +249,12 @@
 	help
 	  Wrap text to fit a specific width.
 
+config FSYNC
+	bool "fsync"
+	default n
+	help
+	  fsync is used to flush file-related cached blocks to disk.
+
 config HEAD
 	bool "head"
 	default n
Index: busybox/include/usage.h
===================================================================
--- busybox/include/usage.h	(revision 23238)
+++ busybox/include/usage.h	(working copy)
@@ -3905,6 +3905,13 @@
 #define sync_full_usage "\n\n" \
        "Write all buffered filesystem blocks to disk"
 
+#define fsync_trivial_usage \
+       "[OPTION]... FILE..."
+#define fsync_full_usage \
+       "Write files' buffered blocks to disk\n" \
+     "\nOptions:" \
+     "\n        -d     Avoid syncing metadata (like access time)"
+
 #define sysctl_trivial_usage \
        "[OPTIONS]... [VALUE]..."
 #define sysctl_full_usage "\n\n" \
Index: busybox/include/applets.h
===================================================================
--- busybox/include/applets.h	(revision 23238)
+++ busybox/include/applets.h	(working copy)
@@ -160,6 +160,7 @@
 //USE_E2FSCK(APPLET_ODDNAME(fsck.ext2, e2fsck, _BB_DIR_SBIN, _BB_SUID_NEVER, fsck_ext2))
 //USE_E2FSCK(APPLET_ODDNAME(fsck.ext3, e2fsck, _BB_DIR_SBIN, _BB_SUID_NEVER, fsck_ext3))
 USE_FSCK_MINIX(APPLET_ODDNAME(fsck.minix, fsck_minix, _BB_DIR_SBIN, _BB_SUID_NEVER, fsck_minix))
+USE_FSYNC(APPLET_NOFORK(fsync, fsync, _BB_DIR_BIN, _BB_SUID_NEVER, fsync))
 USE_FTPGET(APPLET_ODDNAME(ftpget, ftpgetput, _BB_DIR_USR_BIN, _BB_SUID_NEVER, ftpget))
 USE_FTPPUT(APPLET_ODDNAME(ftpput, ftpgetput, _BB_DIR_USR_BIN, _BB_SUID_NEVER, ftpput))
 USE_FUSER(APPLET(fuser, _BB_DIR_USR_BIN, _BB_SUID_NEVER))


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