diff options
| author | Richard Weinberger <richard@nod.at> | 2013-08-18 13:30:06 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2013-09-07 10:56:49 +0200 |
| commit | 805f11a0d515658106bfbfadceff0eb30bd90ad2 (patch) | |
| tree | 2bcfbc9028d5a92875272302bd9e7daf82b4e4be /arch/um/include | |
| parent | f75b1b1bedfb498cc43a992ce4d7ed8df3b1e770 (diff) | |
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>
Diffstat (limited to 'arch/um/include')
| -rw-r--r-- | arch/um/include/shared/os.h | 1 |
1 files changed, 1 insertions, 0 deletions
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); |