V4.12 rc3 r5log rebase#4

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liubogithub wants to merge 14 commits intobtrfs:masterfrom

liubogithub:v4.12-rc3-r5log-rebase

Commits on Jul 27, 2017

Btrfs: raid56: add raid56 log via add_dev v2 ioctl
Liu Bo
committed
Btrfs: raid56: do not allocate chunk on raid56 log
Liu Bo
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Btrfs: raid56: detect raid56 log on mount
Liu Bo
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Btrfs: raid56: add verbose debug
Liu Bo
committed

Commits on Jul 28, 2017

Btrfs: raid56: add stripe log for raid5/6
Liu Bo
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Btrfs: raid56: add reclaim support
Liu Bo
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Btrfs: raid56: load r5log
Liu Bo
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Btrfs: raid56: log recovery
Liu Bo
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Btrfs: raid56: add readahead for recovery
Liu Bo
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Btrfs: raid56: use the readahead helper to get page
Liu Bo
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Btrfs: raid56: add csum support
Liu Bo
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Btrfs: raid56: fix error handling while adding a log device
Liu Bo
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Btrfs: raid56: initialize raid5/6 log after adding it
Liu Bo
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Btrfs: raid56: maintain IO order on raid5/6 log
Liu Bo
committed