Unverified Commit a0d8051c authored by Christian Brauner's avatar Christian Brauner
Browse files

pidfs: add pidfs_root_path() helper 

Allow to return the root of the global pidfs filesystem.

Link: https://lore.kernel.org/20250624-work-pidfs-fhandle-v2-4-d02a04858fe3@kernel.org


Reviewed-by: default avatarJan Kara <jack@suse.cz>
Reviewed-by: default avatarAmir Goldstein <amir73il@gmail.com>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent f7be8a33

fs/internal.h

+1 −0
Original line number Diff line number Diff line
@@ -353,3 +353,4 @@ int anon_inode_getattr(struct mnt_idmap *idmap, const struct path *path, 
		       unsigned int query_flags);

int anon_inode_setattr(struct mnt_idmap *idmap, struct dentry *dentry,

		       struct iattr *attr);

void pidfs_get_root(struct path *path);

fs/pidfs.c

+11 −0
Original line number Diff line number Diff line
@@ -31,6 +31,14 @@ 
static struct kmem_cache *pidfs_attr_cachep __ro_after_init;

static struct kmem_cache *pidfs_xattr_cachep __ro_after_init;



static struct path pidfs_root_path = {};



void pidfs_get_root(struct path *path)

{

	*path = pidfs_root_path;

	path_get(path);

}



/*

 * Stashes information that userspace needs to access even after the

 * process has been reaped.
@@ -1068,4 +1076,7 @@ void __init pidfs_init(void) 
	pidfs_mnt = kern_mount(&pidfs_type);

	if (IS_ERR(pidfs_mnt))

		panic("Failed to mount pidfs pseudo filesystem");



	pidfs_root_path.mnt = pidfs_mnt;

	pidfs_root_path.dentry = pidfs_mnt->mnt_root;

}