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Btrfs: superblock duplication

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This patch implements superblock duplication. Superblocks
are stored at offset 16K, 64M and 256G on every devices.
Spaces used by superblocks are preserved by the allocator,
which uses a reverse mapping function to find the logical
addresses that correspond to superblocks. Thank you,

Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
This commit is contained in:
Yan Zheng 2008-12-08 16:46:26 -05:00 • committed by Chris Mason
commit a512bbf855
8 changed files with 279 additions and 119 deletions
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