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Update btrfs-driver.md (#1717)

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scjane 2017-02-16 17:13:32 +08:00 committed by John Mulhausen
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engine/userguide/storagedriver/btrfs-driver.md
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@ -127,7 +127,7 @@ Writing a new file to a container invokes an allocate-on-demand operation to
allocate new data block to the container's snapshot. The file is then written to
this new space. The allocate-on-demand operation is native to all writes with
Btrfs and is the same as writing new data to a subvolume. As a result, writing
new files to a container's snapshot operate at native Btrfs speeds.
new files to a container's snapshot operates at native Btrfs speeds.
Updating an existing file in a container causes a copy-on-write operation
(technically *redirect-on-write*). The driver leaves the original data and