Btrfs: avoid allocation clusters that are too spread out
In SSD mode for data, and all the time for metadata the allocator will try to find a cluster of nearby blocks for allocations. This commit adds extra checks to make sure that each free block in the cluster is close to the last one. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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1 changed files with 2 additions and 1 deletions
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@ -645,7 +645,8 @@ again:
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* we haven't filled the empty size and the window is
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* very large. reset and try again
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*/
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if (next->offset - window_start > (bytes + empty_size) * 2) {
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if (next->offset - (last->offset + last->bytes) > 128 * 1024 ||
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next->offset - window_start > (bytes + empty_size) * 2) {
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entry = next;
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window_start = entry->offset;
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window_free = entry->bytes;
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