ceph: combine as many iovec as possile into one OSD request
Both ceph_sync_direct_write and ceph_sync_read iterate iovec elements one by one, send one OSD request for each iovec. This is sub-optimal, We can combine serveral iovec into one page vector, and send an OSD request for the whole page vector. Signed-off-by:Zhu, Caifeng <zhucaifeng@unissoft-nj.com> Signed-off-by:
Yan, Zheng <zyan@redhat.com>
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