[RFC PATCH 0/1] Bind-mounting memfds

[Snaipe <me@snai.pe>]

From: "Franklin \"Snaipe\" Mathieu" <me@snai.pe>

Hi folks,

I'm sending this patch that allows the use of open_tree on a memfd with
the intent of bind-mounting it.

I am unsure about the execution of this patch. shm_mnt fails the is_mounted
check, but unlike pidfs and nsfs I can't compare the dentry's d_op
against a known dentry ops global.

I opted for a simple check of path->mnt against shm_mnt but I'm not sure
it's the best approach. Please advise if there's anything better,
otherwise, the patch itself should be straigtforward enough.

Franklin "Snaipe" Mathieu (1):
  fs,ns: allow copying of shm_mnt mount trees

 fs/namespace.c | 8 ++++++++
 mm/internal.h  | 2 ++
 mm/shmem.c     | 2 +-
 3 files changed, 11 insertions(+), 1 deletion(-)

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2.52.0