raise the max piece size to 512 MiB and fix check when loading torrents #7736
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| // count blocks per piece, that's restricting this | ||
| max_blocks_per_piece = (1 << 15) - 1 |
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the reason this wasn't caught early was because this 15 should have been 14. The bitfield was probably changed without this changing.
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| // ---- 64 bit boundary ---- | ||
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| // the number of dirty blocks in this piece | ||
| std::uint32_t num_dirty:14; | ||
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| // the number of blocks in the cache for this piece | ||
| std::uint32_t num_blocks:14; |
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by bumping this to 16 bits, the max piece size goes to 512 MiB
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yeah, that should be wider too
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How about
num_dirty?
And pinned?
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How about
num_dirty?And
pinned?
I hope you haven't lost sight of it. It is also 15 bits.
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I'm tempted to just fix the check rather than mucking about with this struct. Do you think there's a legitimate use for torrents with piece sizes this large? It really seems questionable
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Do you think there's a legitimate use for torrents with piece sizes this large? It really seems questionable
I only know that the problem was reported by users... In addition, what seemed meaningless yesterday or today will become commonplace tomorrow.
Support for 512 MiB piece size does not require major changes, so why not add it?
Still, I don't insist. The correct processing of limits is good in itself. But I would still expand the potential capacity in upcoming major update.
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I think it would be much more reasonable to grow torrents in the number of pieces, rather than piece size.
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| @@ -97,9 +97,9 @@ namespace libtorrent { | |||
| // priority factor | |||
| prio_factor = 3, | |||
| // max blocks per piece | |||
| // there are counters in downloading_piece that only have 15 bits to | |||
| // there are counters in downloading_piece that only have 16 bits to | |||
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I didn't see that the counter itself was changed. Just this comment... Or is it a 16-bit size already?
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num_blocks went from 14 bits to a uint16_t (i.e. 16 bits)
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num_blockswent from 14 bits to auint16_t(i.e. 16 bits)
Ah, I thought it was about something else.
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alternative fix: #7740 |
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