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由 Theodore Ts'o 提交于
Add a mount option which allows the user to disable automatic allocation of blocks whose allocation by delayed allocation when the file was originally truncated or when the file is renamed over an existing file. This feature is intended to save users from the effects of naive application writers, but it reduces the effectiveness of the delayed allocation code. This mount option disables this safety feature, which may be desirable for prodcutions systems where the risk of unclean shutdowns or unexpected system crashes is low. Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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