Re: [PATCH v3 06/12] man/man2/fsconfig.2: document "new" mount API

[Askar Safin]

 ---- On Tue, 12 Aug 2025 22:25:40 +0400  Aleksa Sarai <cyphar@xxxxxxxxxx> wrote --- 
 > On 2025-08-09, Aleksa Sarai <cyphar@xxxxxxxxxx> wrote:
 > > +Note that the Linux kernel reuses filesystem instances
 > > +for many filesystems,
 > > +so (depending on the filesystem being configured and parameters used)
 > > +it is possible for the filesystem instance "created" by
 > > +.B \%FSCONFIG_CMD_CREATE
 > > +to, in fact, be a reference
 > > +to an existing filesystem instance in the kernel.
 > > +The kernel will attempt to merge the specified parameters
 > > +of this filesystem configuration context
 > > +with those of the filesystem instance being reused,
 > > +but some parameters may be
 > > +.IR "silently ignored" .
 > 
 > While looking at this again, I realised this explanation is almost
 > certainly incorrect in a few places (and was based on a misunderstanding
 > of how sget_fc() works and how it interacts with vfs_get_tree()).
 > 
 > I'll rewrite this in the next version.

This recent patch seems to be relevant:
https://lore.kernel.org/all/20250816-debugfs-mount-opts-v3-1-d271dad57b5b@xxxxxxxxxx/

--
Askar Safin
https://types.pl/@safinaskar