Hello everyone,
I'm a newbee Ceph developer, and recenlty reading code of snapshots. From
pg_pool_t::add_unmanaged_snap, it's obvious that the first RBD snapshot id should
start from 2, but in reality, it starts from 4, I wonder whether there are some organisms
in RBD snap, which increments snap_seq, could anyone help me? Thanks in advance! Below is
the code of pg_pool_t::add_unmanaged_snap.
void pg_pool_t::add_unmanaged_snap(uint64_t& snapid)
{
ceph_assert(!is_pool_snaps_mode());
if (snap_seq == 0) {
// kludge for pre-mimic tracking of pool vs selfmanaged snaps. after
// mimic this field is not decoded but our flag is set; pre-mimic, we
// have a non-empty removed_snaps to signifiy a non-pool-snaps pool.
removed_snaps.insert(snapid_t(1));
snap_seq = 1;
}
flags |= FLAG_SELFMANAGED_SNAPS;
snapid = snap_seq = snap_seq + 1;
}
Best regards,
ghost
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