Hi Takashi san,
While doing online defragmentation do we move the blocks corresponding to extent index ? The reason why i am asking this is to understand the usefulness of doing a ext4migrate followed by defrag. I understand that defragmentation in general will improve the performance. But with respect to ext4migrate we are not touching the data blocks. Instead we build the extent map and if that requires to have an extent index block then we allocate one. I am trying to understand what would be the performance impact of this and whether doing a defrag really improve the performance.
Also looking at the version 0.4 I see that defrag ioctl only work if we have EXT4_EXTENTS_FL flag set. What are the plans for making defrag work with indirect block map inode ?
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