2f28b2bdbb
With FEATURE_SYNC_FANCY not set: function old new delta fsync_main 130 123 -7 With FEATURE_SYNC_FANCY set, should be much larger code size savings. Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini sync implementation for busybox
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*
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* Copyright (C) 1995, 1996 by Bruce Perens <bruce@pixar.com>.
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* Copyright (C) 2015 by Ari Sundholm <ari@tuxera.com>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config SYNC
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//config: bool "sync (3.8 kb)"
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//config: default y
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//config: help
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//config: sync is used to flush filesystem buffers.
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//config:config FEATURE_SYNC_FANCY
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//config: bool "Enable -d and -f flags (requires syncfs(2) in libc)"
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//config: default y
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//config: depends on SYNC
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//config: help
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//config: sync -d FILE... executes fdatasync() on each FILE.
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//config: sync -f FILE... executes syncfs() on each FILE.
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// APPLET_NOFORK:name main location suid_type help
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//applet:IF_SYNC(APPLET_NOFORK(sync, sync, BB_DIR_BIN, BB_SUID_DROP, sync))
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//kbuild:lib-$(CONFIG_SYNC) += sync.o
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/* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
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//usage:#define sync_trivial_usage
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//usage: ""IF_FEATURE_SYNC_FANCY("[-df] [FILE]...")
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//usage:#define sync_full_usage "\n\n"
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//usage: IF_NOT_FEATURE_SYNC_FANCY(
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//usage: "Write all buffered blocks to disk"
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//usage: )
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//usage: IF_FEATURE_SYNC_FANCY(
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//usage: "Write all buffered blocks (in FILEs) to disk"
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//usage: "\n -d Avoid syncing metadata"
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//usage: "\n -f Sync filesystems underlying FILEs"
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//usage: )
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#include "libbb.h"
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/* This is a NOFORK applet. Be very careful! */
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#if ENABLE_FEATURE_SYNC_FANCY || ENABLE_FSYNC
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static int sync_common(int opts, char **argv)
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{
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int ret;
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enum {
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OPT_DATASYNC = (1 << 0),
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OPT_SYNCFS = (1 << 1),
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};
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ret = EXIT_SUCCESS;
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do {
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/* GNU "sync FILE" uses O_NONBLOCK open */
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int fd = open_or_warn(*argv, /*O_NOATIME |*/ O_NOCTTY | O_RDONLY | O_NONBLOCK);
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/* open(NOATIME) can only be used by owner or root, don't use NOATIME here */
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if (fd < 0) {
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ret = EXIT_FAILURE;
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goto next;
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}
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# if ENABLE_FEATURE_SYNC_FANCY
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if (opts & OPT_SYNCFS) {
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/*
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* syncfs is documented to only fail with EBADF,
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* which can't happen here. So, no error checks.
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*/
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syncfs(fd);
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} else
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# endif
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if (((opts & OPT_DATASYNC) ? fdatasync(fd) : fsync(fd)) != 0) {
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bb_simple_perror_msg(*argv);
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ret = EXIT_FAILURE;
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}
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close(fd);
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next:
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argv++;
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} while (*argv);
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return ret;
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}
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#endif
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#if ENABLE_SYNC
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int sync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sync_main(int argc UNUSED_PARAM, char **argv IF_NOT_DESKTOP(UNUSED_PARAM))
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{
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# if !ENABLE_FEATURE_SYNC_FANCY
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/* coreutils-6.9 compat */
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bb_warn_ignoring_args(argv[1]);
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sync();
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return EXIT_SUCCESS;
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# else
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unsigned opts = getopt32(argv, "^" "df" "\0" "d--f:f--d");
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argv += optind;
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if (!argv[0]) {
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sync();
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return EXIT_SUCCESS;
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}
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return sync_common(opts, argv);
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# endif
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}
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#endif
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/*
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* Mini fsync implementation for busybox
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*
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* Copyright (C) 2008 Nokia Corporation. All rights reserved.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config FSYNC
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//config: bool "fsync (3.6 kb)"
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//config: default y
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//config: help
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//config: fsync is used to flush file-related cached blocks to disk.
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// APPLET_NOFORK:name main location suid_type help
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//applet:IF_FSYNC(APPLET_NOFORK(fsync, fsync, BB_DIR_BIN, BB_SUID_DROP, fsync))
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//kbuild:lib-$(CONFIG_FSYNC) += sync.o
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//usage:#define fsync_trivial_usage
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//usage: "[-d] FILE..."
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//usage:#define fsync_full_usage "\n\n"
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//usage: "Write all buffered blocks in FILEs to disk\n"
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//usage: "\n -d Avoid syncing metadata"
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#if ENABLE_FSYNC
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int fsync_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int fsync_main(int argc UNUSED_PARAM, char **argv)
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{
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int opts = getopt32(argv, "^" "d" "\0" "-1"/*min 1 arg*/);
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argv += optind;
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return sync_common(opts, argv);
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}
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#endif
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