Re: [PATCH -next v5 18/32] ext4: implement partial block zero range path using iomap

> From: Zhang Yi <[email protected]>
> 
> Introduce a new iomap_ops instance, ext4_iomap_zero_ops, along with
> ext4_iomap_block_zero_range() to implement block zeroing via the iomap
> infrastructure for ext4.
> 
> ext4_iomap_block_zero_range() calls iomap_zero_range() with
> ext4_iomap_zero_begin() as the callback. The callback locates the
> range and populates the iomap mapping. If the range is mapped,
> iomap_zero_iter() in the iomap core zeros the partial block
> directly. If the range is an unwritten extent within EOF, the
> callback collects a dirty folio batch via iomap_fill_dirty_folios()
> so that iomap_zero_iter() can zero those folios directly, bypassing
> a separate slow flush operation that would otherwise be needed to
> convert the unwritten extent.
> [ ... ]
> 
> Subsequent patches will address this by deferring i_disksize update
> to i_size until after the zeroed data has been written back.
> 
> Signed-off-by: Zhang Yi <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/[email protected]?part=18