74a87c3804
trying to build a cluster. The limit is tunable using the sysctl vfs.ffs.maxclustersearch. The current limit is 10 cylinder groups per block allocation. It was previously limited to the number of cylinder groups in the filesystem per block allocation. When there were no clusters of the needed size left, it repeatedly searched the whole filesystem for a non-existent cluster on every block allocation. The result was very slow filesystem allocation with 100% CPU utilization. The old behavior can be had by setting vfs.ffs.maxclustersearch to a huge number (1,000,000). This change affects only the layout policy routines so is not able to interfere with the integrity of the filesystem. Reported by: Dmitry Sivachenko (demon@) Tested by: Dmitry Sivachenko (demon@) MFC after: 2 weeks
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