Re: refactor the iomap writeback code v5

[Christian Brauner <brauner@kernel.org>]

On Thu, 10 Jul 2025 15:33:24 +0200, Christoph Hellwig wrote:
> this is an alternative approach to the writeback part of the
> "fuse: use iomap for buffered writes + writeback" series from Joanne.
> It doesn't try to make the code build without CONFIG_BLOCK yet.

I dropped that sentence from the merge commit.

> 
> The big difference compared to Joanne's version is that I hope the
> split between the generic and ioend/bio based writeback code is a bit
> cleaner here.  We have two methods that define the split between the
> generic writeback code, and the implemementation of it, and all knowledge
> of ioends and bios now sits below that layer.
> 
> [...]

Applied to the vfs-6.17.iomap branch of the vfs/vfs.git tree.
Patches in the vfs-6.17.iomap branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-6.17.iomap

[01/14] iomap: header diet
        https://git.kernel.org/vfs/vfs/c/8cd0a39cab56
[02/14] iomap: pass more arguments using the iomap writeback context
        https://git.kernel.org/vfs/vfs/c/67fd9615a782
[03/14] iomap: cleanup the pending writeback tracking in iomap_writepage_map_blocks
        https://git.kernel.org/vfs/vfs/c/40368a6acb95
[04/14] iomap: refactor the writeback interface
        https://git.kernel.org/vfs/vfs/c/fb7399cf2d0b
[05/14] iomap: hide ioends from the generic writeback code
        https://git.kernel.org/vfs/vfs/c/f4fa7981fa26
[06/14] iomap: add public helpers for uptodate state manipulation
        https://git.kernel.org/vfs/vfs/c/9caf1ea80ced
[07/14] iomap: move all ioend handling to ioend.c
        https://git.kernel.org/vfs/vfs/c/8f02cecd80b9
[08/14] iomap: rename iomap_writepage_map to iomap_writeback_folio
        https://git.kernel.org/vfs/vfs/c/58f0d5a30427
[09/14] iomap: move folio_unlock out of iomap_writeback_folio
        https://git.kernel.org/vfs/vfs/c/f8b6a94a4cca
[10/14] iomap: export iomap_writeback_folio
        https://git.kernel.org/vfs/vfs/c/8b217cf779cb
[11/14] iomap: replace iomap_folio_ops with iomap_write_ops
        https://git.kernel.org/vfs/vfs/c/2a5574fc57d1
[12/14] iomap: improve argument passing to iomap_read_folio_sync
        https://git.kernel.org/vfs/vfs/c/e6caf01d3f57
[13/14] iomap: add read_folio_range() handler for buffered writes
        https://git.kernel.org/vfs/vfs/c/c5690dd01978
[14/14] iomap: build the writeback code without CONFIG_BLOCK
        https://git.kernel.org/vfs/vfs/c/5699b7e21d20