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Btrfs: use larger metadata clusters in ssd mode
Larger metadata clusters can significantly improve writeback performance on ssd drives with large erasure blocks. The larger clusters make it more likely a given IO will completely overwrite the ssd block, so it doesn't have to do an internal rwm cycle. On spinning media, lager metadata clusters end up spreading out the metadata more over time, which makes fsck slower, so we don't want this to be the default. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -2872,7 +2872,8 @@ static noinline int find_free_extent(struct btrfs_trans_handle *trans,
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if (data & BTRFS_BLOCK_GROUP_METADATA) {
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last_ptr = &root->fs_info->last_alloc;
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empty_cluster = 64 * 1024;
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if (!btrfs_test_opt(root, SSD))
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empty_cluster = 64 * 1024;
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}
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if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD))
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