There's no easy way to invoke syncfs from the commandline,
as far as I know, so add it to xfs_io to be handy.
Add sync while we're at it, just for completeness.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
---
V2: sync doesn't need to have a file open
diff --git a/io/Makefile b/io/Makefile
index c16af87..82593a6 100644
--- a/io/Makefile
+++ b/io/Makefile
@@ -11,7 +11,7 @@ HFILES = init.h io.h
CFILES = init.c \
attr.c bmap.c file.c freeze.c fsync.c getrusage.c imap.c link.c \
mmap.c open.c parent.c pread.c prealloc.c pwrite.c seek.c shutdown.c \
- truncate.c
+ sync.c truncate.c
LLDLIBS = $(LIBXCMD) $(LIBHANDLE)
LTDEPENDENCIES = $(LIBXCMD) $(LIBHANDLE)
@@ -64,6 +64,10 @@ CFILES += sync_file_range.c
LCFLAGS += -DHAVE_SYNC_FILE_RANGE
endif
+ifeq ($(HAVE_SYNCFS),yes)
+LCFLAGS += -DHAVE_SYNCFS
+endif
+
ifeq ($(ENABLE_READLINE),yes)
LLDLIBS += $(LIBREADLINE) $(LIBTERMCAP)
endif
diff --git a/io/init.c b/io/init.c
index bfc35bf..1b07518 100644
--- a/io/init.c
+++ b/io/init.c
@@ -80,8 +80,9 @@ init_commands(void)
resblks_init();
sendfile_init();
shutdown_init();
- truncate_init();
+ sync_init();
sync_range_init();
+ truncate_init();
}
static int
diff --git a/io/io.h b/io/io.h
index 1b3bca1..db8b513 100644
--- a/io/io.h
+++ b/io/io.h
@@ -109,6 +109,7 @@ extern void pwrite_init(void);
extern void quit_init(void);
extern void seek_init(void);
extern void shutdown_init(void);
+extern void sync_init(void);
extern void truncate_init(void);
#ifdef HAVE_FADVISE
diff --git a/io/sync.c b/io/sync.c
new file mode 100644
index 0000000..683899b
--- /dev/null
+++ b/io/sync.c
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2014 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <xfs/xfs.h>
+#include <xfs/command.h>
+#include "init.h"
+#include "io.h"
+
+static cmdinfo_t sync_cmd;
+
+static int
+sync_f(
+ int argc,
+ char **argv)
+{
+ /* sync can't fail */
+ sync();
+ return 0;
+}
+
+#ifdef HAVE_SYNCFS
+static cmdinfo_t syncfs_cmd;
+
+static int
+syncfs_f(
+ int argc,
+ char **argv)
+{
+ /* syncfs can't fail */
+ syncfs(file->fd);
+ return 0;
+}
+#endif
+
+void
+sync_init(void)
+{
+ sync_cmd.name = "sync";
+ sync_cmd.cfunc = sync_f;
+ sync_cmd.flags = CMD_NOMAP_OK | CMD_NOFILE_OK | CMD_FOREIGN_OK;
+ sync_cmd.oneline =
+ _("calls sync(2) to flush all in-core filesystem state to disk");
+
+ add_command(&sync_cmd);
+
+#ifdef HAVE_SYNCFS
+ syncfs_cmd.name = "syncfs";
+ syncfs_cmd.cfunc = syncfs_f;
+ syncfs_cmd.flags = CMD_NOMAP_OK | CMD_FOREIGN_OK;
+ syncfs_cmd.oneline =
+ _("calls syncfs(2) to flush all in-core filesystem state to disk");
+
+ add_command(&syncfs_cmd);
+#endif
+}
diff --git a/m4/package_libcdev.m4 b/m4/package_libcdev.m4
index 8267ba0..919ae0a 100644
--- a/m4/package_libcdev.m4
+++ b/m4/package_libcdev.m4
@@ -171,6 +171,23 @@ AC_DEFUN([AC_HAVE_SYNC_FILE_RANGE],
])
#
+# Check if we have a syncfs libc call (Linux)
+#
+AC_DEFUN([AC_HAVE_SYNCFS],
+ [ AC_MSG_CHECKING([for syncfs])
+ AC_TRY_LINK([
+#define _GNU_SOURCE
+#define _FILE_OFFSET_BITS 64
+#include <unistd.h>
+ ], [
+ syncfs(0);
+ ], have_sync_fs=yes
+ AC_MSG_RESULT(yes),
+ AC_MSG_RESULT(no))
+ AC_SUBST(have_syncfs)
+ ])
+
+#
# Check if we have a readdir libc call
#
AC_DEFUN([AC_HAVE_READDIR],
diff --git a/man/man8/xfs_io.8 b/man/man8/xfs_io.8
index e40fbf9..cf27b99 100644
--- a/man/man8/xfs_io.8
+++ b/man/man8/xfs_io.8
@@ -362,6 +362,16 @@ start writeback of dirty data in the given range (SYNC_FILE_RANGE_WRITE).
.RE
.PD
.TP
+.B sync
+Calls
+.BR sync (2)
+to flush all filesystems' in-core data to disk.
+.TP
+.B syncfs
+Calls
+.BR syncfs (2)
+to flush this filesystem's in-core data to disk.
+.TP
.BI resvsp " offset length"
Allocates reserved, unwritten space for part of a file using the
XFS_IOC_RESVSP system call described in the
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