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 ?
-aneesh
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