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@@ -132,9 +132,9 @@ func (f *freelist) free(txid txid, p *page) {
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allocTxid, ok := f.allocs[p.id]
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if ok {
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delete(f.allocs, p.id)
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- } else if (p.flags & (freelistPageFlag | metaPageFlag)) != 0 {
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- // Safe to claim txid as allocating since these types are private to txid.
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- allocTxid = txid
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+ } else if (p.flags & freelistPageFlag) != 0 {
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+ // Freelist is always allocated by prior tx.
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+ allocTxid = txid - 1
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}
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for id := p.id; id <= p.id+pgid(p.overflow); id++ {
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@@ -233,6 +233,9 @@ func (f *freelist) freed(pgid pgid) bool {
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// read initializes the freelist from a freelist page.
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func (f *freelist) read(p *page) {
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+ if (p.flags & freelistPageFlag) == 0 {
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+ panic(fmt.Sprintf("invalid freelist page: %d, page type is %s", p.id, p.typ()))
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+ }
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// If the page.count is at the max uint16 value (64k) then it's considered
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// an overflow and the size of the freelist is stored as the first element.
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idx, count := 0, int(p.count)
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Gyu-Ho Lee