Not really, RWF_DSYNC is equivalent to open(2) with O_DSYNC when writing which is equivalent to write(2) followed by fdatasync(2) and:
fdatasync() is similar to fsync(), but does not flush modified
metadata unless that metadata is needed in order to allow a
subsequent data retrieval to be correctly handled. For example,
changes to st_atime or st_mtime (respectively, time of last access
and time of last modification; see inode(7)) do not require
flushing because they are not necessary for a subsequent data read
to be handled correctly. On the other hand, a change to the file
size (st_size, as made by say ftruncate(2)), would require a
metadata flush.
