dm persistent data: remove space map ref_count entries if redundant
Save space by removing entries from the space map ref_count tree if they're no longer needed. Ref counts are stored in two places: a bitmap if the ref_count is below 3, or a btree of uint32_t if 3 or above. When a ref_count that was above 3 drops below we can remove it from the tree and save some metadata space. This removal was commented out before because I was unsure why this was causing under-populated btree nodes. Earlier patches have fixed this issue. Signed-off-by: Joe Thornber <ejt@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com> Signed-off-by: Alasdair G Kergon <agk@redhat.com>
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@ -405,8 +405,6 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
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if (r < 0)
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if (r < 0)
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return r;
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return r;
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#if 0
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/* FIXME: dm_btree_remove doesn't handle this yet */
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if (old > 2) {
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if (old > 2) {
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r = dm_btree_remove(&ll->ref_count_info,
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r = dm_btree_remove(&ll->ref_count_info,
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ll->ref_count_root,
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ll->ref_count_root,
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@ -414,7 +412,6 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
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if (r)
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if (r)
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return r;
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return r;
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}
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}
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#endif
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} else {
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} else {
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__le32 le_rc = cpu_to_le32(ref_count);
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__le32 le_rc = cpu_to_le32(ref_count);
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