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Btrfs: fix recursive defragment with autodefrag option
$ mkfs.btrfs disk $ mount disk /mnt -o autodefrag $ dd if=/dev/zero of=/mnt/foobar bs=4k count=10 2>/dev/null && sync $ for i in `seq 9 -2 0`; do dd if=/dev/zero of=/mnt/foobar bs=4k count=1 \ seek=$i conv=notrunc 2> /dev/null; done && sync then we'll get to defrag "foobar" again and again. So does option "-o autodefrag,compress". Reasons: When the cleaner kthread gets to fetch inodes from the defrag tree and defrag them, it will dirty pages and submit them, this will comes to another DATA COW where the processing inode will be inserted to the defrag tree again. This patch sets a rule for COW code, i.e. insert an inode when we're really going to make some defragments. Signed-off-by: Liu Bo <[email protected]> Signed-off-by: Chris Mason <[email protected]>
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