ceef722d01482f111df24f5005e71a615d87f3fd
Add new functions that write and flush the written data to disk immediately.
This is what needs to be used for image format metadata to maintain integrity
for cache=... modes that don't use O_DSYNC. (Actually, we only need barriers,
and therefore the functions are defined as such, but flushes is what is
implemented in this patch - we can try to change that later)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit f08145fe16
)
Read the documentation in qemu-doc.html. Fabrice Bellard.
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