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Btrfs: fix max chunk size check in chunk allocator
Fix a bug, where in case we need to adjust stripe_size so that the length of the resulting chunk is less than or equal to max_chunk_size, DUP chunks turn out to be only half as big as they could be. Cc: Arne Jansen <sensille@gmx.net> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
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1 changed files with 4 additions and 2 deletions
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@ -3324,12 +3324,14 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
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stripe_size = devices_info[ndevs-1].max_avail;
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num_stripes = ndevs * dev_stripes;
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if (stripe_size * num_stripes > max_chunk_size * ncopies) {
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if (stripe_size * ndevs > max_chunk_size * ncopies) {
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stripe_size = max_chunk_size * ncopies;
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do_div(stripe_size, num_stripes);
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do_div(stripe_size, ndevs);
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}
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do_div(stripe_size, dev_stripes);
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/* align to BTRFS_STRIPE_LEN */
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do_div(stripe_size, BTRFS_STRIPE_LEN);
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stripe_size *= BTRFS_STRIPE_LEN;
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