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os/bluestore: reshard on truncate if shards past EOF

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This ensure we mop up shards past EOF instead of encoding them
empty and confusing future code (that, say, assumes no shards past
EOF).

Signed-off-by: Sage Weil <sage@redhat.com>
This commit is contained in:
Sage Weil 2017-01-27 15:59:23 -05:00
parent 92a555ec42
commit c7949d4010
1 changed files with 11 additions and 0 deletions
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11
src/os/bluestore/BlueStore.cc
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@ -8826,6 +8826,17 @@ int BlueStore::_do_truncate(
o->extent_map.punch_hole(offset, length, &wctx.old_extents);
o->extent_map.dirty_range(txc->t, offset, length);
_wctx_finish(txc, c, o, &wctx);
// if we have shards past EOF, ask for a reshard
if (!o->onode.extent_map_shards.empty() &&
o->onode.extent_map_shards.back().offset >= offset) {
dout(10) << __func__ << " request reshard past EOF" << dendl;
if (offset) {
o->extent_map.request_reshard(offset - 1, offset + length);
} else {
o->extent_map.request_reshard(0, length);
}
}
}
o->onode.size = offset;