From 805f11a0d515658106bfbfadceff0eb30bd90ad2 Mon Sep 17 00:00:00 2001 From: Richard Weinberger <richard@nod.at> Date: Sun, 18 Aug 2013 13:30:06 +0200 Subject: um: ubd: Add REQ_FLUSH suppport UML's block device driver does not support write barriers, to support this this patch adds REQ_FLUSH suppport. Every time the block layer sends a REQ_FLUSH we fsync() now our backing file to guarantee data consistency. Reported-and-tested-by: Richard W.M. Jones <rjones@redhat.com> Signed-off-by: Richard Weinberger <richard@nod.at> --- arch/um/include/shared/os.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/um/include') diff --git a/arch/um/include/shared/os.h b/arch/um/include/shared/os.h index c70a234a3f8c..e98303925cc5 100644 --- a/arch/um/include/shared/os.h +++ b/arch/um/include/shared/os.h @@ -141,6 +141,7 @@ extern int os_seek_file(int fd, unsigned long long offset); extern int os_open_file(const char *file, struct openflags flags, int mode); extern int os_read_file(int fd, void *buf, int len); extern int os_write_file(int fd, const void *buf, int count); +extern int os_sync_file(int fd); extern int os_file_size(const char *file, unsigned long long *size_out); extern int os_file_modtime(const char *file, unsigned long *modtime); extern int os_pipe(int *fd, int stream, int close_on_exec); -- cgit v1.2.3