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| 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/os-Linux | |
| parent | um: Implement probe_kernel_read() (diff) | |
| download | linux-dev-805f11a0d515658106bfbfadceff0eb30bd90ad2.tar.xz linux-dev-805f11a0d515658106bfbfadceff0eb30bd90ad2.zip | |
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/os-Linux')
| -rw-r--r-- | arch/um/os-Linux/file.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c index c17bd6f7d674..07a750197bb0 100644 --- a/arch/um/os-Linux/file.c +++ b/arch/um/os-Linux/file.c @@ -266,6 +266,15 @@ int os_write_file(int fd, const void *buf, int len) return n; } +int os_sync_file(int fd) +{ + int n = fsync(fd); + + if (n < 0) + return -errno; + return n; +} + int os_file_size(const char *file, unsigned long long *size_out) { struct uml_stat buf; |