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ovl: add ovl_upper_mnt_userns() wrapper 

Add a tiny wrapper to retrieve the upper mount's idmapping. Have it
return the initial idmapping until we have prepared and converted all
places to take the relevant idmapping into account. Then we can switch
on idmapped layer support by having ovl_upper_mnt_userns() return the
upper mount's idmapping.

Suggested-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Christian Brauner 2022-04-04 12:51:44 +02:00 committed by Miklos Szeredi
parent 576bb26345
commit b65c20acef
1 changed files with 5 additions and 0 deletions
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5
fs/overlayfs/ovl_entry.h
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@ -90,6 +90,11 @@ static inline struct vfsmount *ovl_upper_mnt(struct ovl_fs *ofs)
return ofs->layers[0].mnt; return ofs->layers[0].mnt;
} }
static inline struct user_namespace *ovl_upper_mnt_userns(struct ovl_fs *ofs)
{
return &init_user_ns;
}
static inline struct ovl_fs *OVL_FS(struct super_block *sb) static inline struct ovl_fs *OVL_FS(struct super_block *sb)
{ {
return (struct ovl_fs *)sb->s_fs_info; return (struct ovl_fs *)sb->s_fs_info;