nullfs: add an empty immutable regular file

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Add nullfs_new_file() to allocate an empty immutable regular file on a
nullfs instance as a dentry of its own. It is never hashed under the
root and so can't be found by lookup. Reads return nothing, changes are
refused, file locks, leases and delegations are refused as.

Link: https://patch.msgid.link/20261002-work-mount-cover-v1-1-232a8f52b43c@kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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Christian Brauner 2026-10-02 16:14:27 +02:00

parent 1514faf41f

commit 54867884fe

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1

fs/mount.h

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25

fs/namespace.c

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88

fs/nullfs.c

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