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Replace ->map_blocks with a new ->writeback_range, which differs in the following ways: - it must also queue up the I/O for writeback, that is called into the slightly refactored and extended in scope iomap_add_to_ioend for each region - can handle only a part of the requested region, that is the retry loop for partial mappings moves to the caller - handles cleanup on failures as well, and thus also replaces the discard_folio method only implemented by XFS. This will allow to use the iomap writeback code also for file systems that are not block based like fuse. Co-developed-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Joanne Koong <joannelkoong@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/20250710133343.399917-5-hch@lst.de Acked-by: Damien Le Moal <dlemoal@kernel.org> # zonefs Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Christian Brauner <brauner@kernel.org>