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Btrfs: make sure a bitmap has enough bytes
We have only been checking for min_bytes available in bitmap entries, but we won't successfully setup a bitmap cluster unless it has at least bytes in the bitmap, so in the common case min_bytes is 4k and we want something like 2MB, so if there are a bunch of bitmap entries with less than 2mb's in them, we'll search all them anyway, which is suboptimal. Fix this check. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -2475,7 +2475,7 @@ setup_cluster_bitmap(struct btrfs_block_group_cache *block_group,
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}
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}
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list_for_each_entry(entry, bitmaps, list) {
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list_for_each_entry(entry, bitmaps, list) {
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if (entry->bytes < min_bytes)
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if (entry->bytes < bytes)
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continue;
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continue;
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ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset,
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ret = btrfs_bitmap_cluster(block_group, entry, cluster, offset,
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bytes, cont1_bytes, min_bytes);
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bytes, cont1_bytes, min_bytes);
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