sho@xxxxxxxxxxxxxx wrote:
Hi,
I am considering the online defrag function for ext4 and thinking
that your following patch set for multi-block allocation is useful
to search contiguous free blocks for the defragmentation.
"[RFC] extents,mballoc,delalloc for 2.6.16.8"
http://marc.theaimsgroup.com/?l=linux-ext4&m=114669168616780&w=2
I will send the patch of simple defrag implementation for ext4 later.
I have written the patches of ioctl for extent base online defragment
and the command which call it.
These patches are at the experimental stage so they need many
improvements. But they work well so far as basic defragmenter,
which means they are worth enough to examine my trial.
- Specify the target area in a file using the following structure:
struct ext3_ext_defrag_data {
loff_t start_offset; /* start offset to defrag in bytes */
loff_t defrag_size; /* size of defrag in bytes */
}
It uses loff_t so that the size of the structure is identical on
both 32 bits and 64 bits architecture.
Block allocation, including searching for the free contiguous
blocks, is implemented in kernel.
NAK the ioctl approach.
People who like ioctls are just holdovers from non-Linux OS's.
Jeff
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