Re: [60/63] setup_mnt(): primitive for connecting a mount to filesystem

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On Fri, Aug 29, 2025 at 11:59:55AM +0200, Christian Brauner wrote:
> On Fri, Aug 29, 2025 at 07:05:22AM +0100, Al Viro wrote:
> > Take the identical logics in vfs_create_mount() and clone_mnt() into
> > a new helper that takes an empty struct mount and attaches it to
> > given dentry (sub)tree.
> > 
> > Should be called once in the lifetime of every mount, prior to making
> > it visible in any data structures.
> > 
> > After that point ->mnt_root and ->mnt_sb never change; ->mnt_root
> > is a counting reference to dentry and ->mnt_sb - an active reference
> > to superblock.
> > 
> > Mount remains associated with that dentry tree all the way until
> > the call of cleanup_mnt(), when the refcount eventually drops
> > to zero.
> > 
> > Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> > ---
> 
> Is this supposed to be the v3? I'm confused what I need to be looking
> at since it's a reply to v2 and some earlier review comments...

It would be in v3, but I didn't feel like sending another 63-patch
mailbomb for the sake of these 4 changed commits (well, and a cosmetical
change in #33, with matching modification in #35, ending with both
being cleaner - with the same resulting tree after #35).

These 4 do repace #59..#62 in v3.




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