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pfg
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2017-08-20T01:27:33.634692Z
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MFC r320145:
ext2fs: Add uninit_bg feature support.

From the linux tune2fs(8) manpage:
"Allow the kernel to initialize bitmaps and inode tables and keep a high
watermark for the unused inodes in a filesystem, to reduce e2fsck(8) time.
This first e2fsck run after enabling this feature will take the full time,
but subsequent e2fsck runs will take only a fraction of the original time,
depending on how full the file system is."

Submitted by:	Fedor Uporov

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