Date:   Wed,  9 Aug 2023 09:09:49 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Jeff Layton <jlayton@...nel.org>
Cc:     Christian Brauner <brauner@...nel.org>,
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Subject: Re: [PATCH v7 00/13] fs: implement multigrain timestamps

On Mon, 07 Aug 2023 15:38:31 -0400, Jeff Layton wrote:
> The VFS always uses coarse-grained timestamps when updating the
> ctime and mtime after a change. This has the benefit of allowing
> filesystems to optimize away a lot metadata updates, down to around 1
> per jiffy, even when a file is under heavy writes.
> 
> Unfortunately, this coarseness has always been an issue when we're
> exporting via NFSv3, which relies on timestamps to validate caches. A
> lot of changes can happen in a jiffy, so timestamps aren't sufficient to
> help the client decide to invalidate the cache.
> 
> [...]

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

[01/13] fs: remove silly warning from current_time
        https://git.kernel.org/vfs/vfs/c/562bcab11bf4
[02/13] fs: pass the request_mask to generic_fillattr
        https://git.kernel.org/vfs/vfs/c/3592165f4378
[03/13] fs: drop the timespec64 arg from generic_update_time
        https://git.kernel.org/vfs/vfs/c/32586bb50943
[04/13] btrfs: have it use inode_update_timestamps
        https://git.kernel.org/vfs/vfs/c/51fc38e7c7d1
[05/13] fat: make fat_update_time get its own timestamp
        https://git.kernel.org/vfs/vfs/c/d6e7faae82dc
[06/13] ubifs: have ubifs_update_time use inode_update_timestamps
        https://git.kernel.org/vfs/vfs/c/853ff59b434a
[07/13] xfs: have xfs_vn_update_time gets its own timestamp
        https://git.kernel.org/vfs/vfs/c/7ad056c2cf36
[08/13] fs: drop the timespec64 argument from update_time
        https://git.kernel.org/vfs/vfs/c/3beae086b71f
[09/13] fs: add infrastructure for multigrain timestamps
        https://git.kernel.org/vfs/vfs/c/b16956ed812f
[10/13] tmpfs: add support for multigrain timestamps
        https://git.kernel.org/vfs/vfs/c/bd21ec574f16
[11/13] xfs: switch to multigrain timestamps
        https://git.kernel.org/vfs/vfs/c/fb9812d2c39e
[12/13] ext4: switch to multigrain timestamps
        https://git.kernel.org/vfs/vfs/c/7fdf02299f5d
[13/13] btrfs: convert to multigrain timestamps
        https://git.kernel.org/vfs/vfs/c/2ebbf04988b9

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