On Tue, Feb 17, 2015 at 12:47:50AM +0900, Namjae Jeon wrote:

From: Namjae Jeon <redacted>

This patch implements fallocate's FALLOC_FL_INSERT_RANGE for Ext4.

1) Make sure that both offset and len are block size aligned.
2) Update the i_size of inode by len bytes.
3) Compute the file's logical block number against offset. If the computed
   block number is not the starting block of the extent, split the extent
   such that the block number is the starting block of the extent.
4) Shift all the extents which are lying bewteen [offset, last allocated extent]
   towards right by len bytes. This step will make a hole of len bytes
   at offset.

Signed-off-by: Namjae Jeon <redacted>
Signed-off-by: Ashish Sangwan <redacted>

I'll leave this for the ext4 folk to review. If I don't get a review
by the time we're ready to merge the VFS and XFS code, then I'll
leave it out and let Ted merge it inhis own time.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com