Re: (subset) fix stale delalloc punching for COW I/O v2

[Christian Brauner <brauner@kernel.org>]

On Tue, 10 Sep 2024 07:39:02 +0300, Christoph Hellwig wrote:
> this is another fallout from the zoned XFS work, which stresses the XFS
> COW I/O path very heavily.  It affects normal I/O to reflinked files as
> well, but is very hard to hit there.
> 
> The main problem here is that we only punch out delalloc reservations
> from the data fork, but COW I/O places delalloc extents into the COW
> fork, which means that it won't get punched out forshort writes.
> 
> [...]

Christoph, could you double-check that things look good to you? I had to
resolve a minor merge conflict.

---

Applied to the vfs.blocksize branch of the vfs/vfs.git tree.
Patches in the vfs.blocksize 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.blocksize

[01/12] iomap: handle a post-direct I/O invalidate race in iomap_write_delalloc_release
        https://git.kernel.org/vfs/vfs/c/7a9d43eace88
[02/12] iomap: improve shared block detection in iomap_unshare_iter
        https://git.kernel.org/vfs/vfs/c/b53fdb215d13
[03/12] iomap: pass flags to iomap_file_buffered_write_punch_delalloc
        https://git.kernel.org/vfs/vfs/c/11596dc3dfae
[04/12] iomap: pass the iomap to the punch callback
        https://git.kernel.org/vfs/vfs/c/492f53758fad
[05/12] iomap: remove the iomap_file_buffered_write_punch_delalloc return value
        https://git.kernel.org/vfs/vfs/c/4bceb9ba05ac