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authorChris Mason <chris.mason@oracle.com>2010-03-10 10:52:59 -0500
committerChris Mason <chris.mason@oracle.com>2010-03-15 11:00:10 -0400
commit940100a4a7b78b27e60a3e72340fb9b5397dcdb2 (patch)
tree8eec3d4a95cbc530ddaa82f0d2848e14519eec2a /scripts/basic
parent51684082b11c304829ea22193d4d96a5b1663b97 (diff)
Btrfs: be more selective in the defrag ioctl
The btrfs defrag ioctl had some bugs around delalloc accounting, and it wasn't properly skipping pages that were not in the mapping. It wasn't properly clearing the page checked flag, which could make the writeback code ignore the page forever while pinning it as dirty. This commit fixes those problems and makes defrag a little smarter. It skips holes and it doesn't waste time defragging large extents. If a tiny extent comes before a very large extent, it will defrag both of them to make sure the tiny extent ends up next to something big. Signed-off-by: Chris Mason <chris.mason@oracle.com>
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