Re: [PATCH RESEND 3/12] ext4: Add support FALLOC_FL_INSERT_RANGE for fallocate

From: Dave Chinner
Date: Mon Feb 16 2015 - 20:03:13 EST

On Tue, Feb 17, 2015 at 12:47:50AM +0900, Namjae Jeon wrote:
> From: Namjae Jeon <namjae.jeon@xxxxxxxxxxx>
> 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 <namjae.jeon@xxxxxxxxxxx>
> Signed-off-by: Ashish Sangwan <a.sangwan@xxxxxxxxxxx>

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.


Dave Chinner
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