From 32a0a965b8a5b7b505babae2ee10c513ede376d8 Mon Sep 17 00:00:00 2001 From: Christian Brauner Date: Tue, 6 Aug 2024 18:02:29 +0200 Subject: proc: add proc_splice_unmountable() Add a tiny procfs helper to splice a dentry that cannot be mounted upon. Link: https://lore.kernel.org/r/20240806-work-procfs-v1-3-fb04e1d09f0c@kernel.org Reviewed-by: Josef Bacik Signed-off-by: Christian Brauner --- fs/proc/internal.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'fs/proc/internal.h') diff --git a/fs/proc/internal.h b/fs/proc/internal.h index a8a8576d8592..9e3f25e4c188 100644 --- a/fs/proc/internal.h +++ b/fs/proc/internal.h @@ -349,3 +349,16 @@ static inline void pde_force_lookup(struct proc_dir_entry *pde) /* /proc/net/ entries can be changed under us by setns(CLONE_NEWNET) */ pde->proc_dops = &proc_net_dentry_ops; } + +/* + * Add a new procfs dentry that can't serve as a mountpoint. That should + * encompass anything that is ephemeral and can just disappear while the + * process is still around. + */ +static inline struct dentry *proc_splice_unmountable(struct inode *inode, + struct dentry *dentry, const struct dentry_operations *d_ops) +{ + d_set_d_op(dentry, d_ops); + dont_mount(dentry); + return d_splice_alias(inode, dentry); +} -- cgit