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proc: add proc_splice_unmountable()

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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 <josef@toxicpanda.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2024-08-06 18:02:29 +02:00
parent 55d4860db2
commit 32a0a965b8
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 13 additions and 0 deletions
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13
fs/proc/internal.h
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@ -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);
}