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vfs: pass S_IFDIR mode to vfs_prepare_mode()

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There is a comment in vfs_prepare_mode() that says:

  Note that it's currently valid for @type to be 0 if a directory is
  created. Filesystems raise that flag individually and we need to check
  whether each filesystem can deal with receiving S_IFDIR from the vfs
  before we enforce a non-zero type.

It is safe to do this clean-up except that three filesystems (fuse,
cifs, and coda) forward the mkdir @mode unchanged to something outside
the kernel. Mask S_IFDIR back out in coda_mkdir(), fuse_mkdir() and
cifs_mkdir() so that what is sent outside the kernel is unchanged.
Their maintainers can drop the mask once they have confirmed it is safe.

Assisted-by: LLM
Signed-off-by: Jori Koolstra <jkoolstra@xs4all.nl>
Link: https://patch.msgid.link/20260630105400.68459-2-jkoolstra@xs4all.nl
Reviewed-by: NeilBrown <neil@brown.name>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
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Jori Koolstra 2026-06-30 12:53:30 +02:00 • committed by Christian Brauner
commit 2f3a7a488c
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4 changed files with 22 additions and 7 deletions
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