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Btrfs: make sure the chunk allocator doesn't create zero length chunks
A recent commit allowed for smaller chunks to be created, but didn't make sure they were always bigger than a stripe. After some divides, this led to zero length stripes. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -2249,6 +2249,12 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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if (!looped)
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calc_size = max_t(u64, min_stripe_size, calc_size);
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/*
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* we're about to do_div by the stripe_len so lets make sure
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* we end up with something bigger than a stripe
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*/
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calc_size = max_t(u64, calc_size, stripe_len * 4);
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do_div(calc_size, stripe_len);
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calc_size *= stripe_len;
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