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[ Upstream commit ffa5723 ] Create some ovl_i_* helpers to get real path from ovl inode. Instead of just stashing struct inode for the lower layer we stash struct path for the lower layer. The helpers allow to retrieve a struct path for the relevant upper or lower layer. This will be used when retrieving information based on struct inode when copying up inode attributes from upper or lower inodes to ovl inodes and when checking permissions in ovl_permission() in following patches. This is needed to support idmapped base layers with overlay. Cc: <linux-unionfs@vger.kernel.org> Tested-by: Giuseppe Scrivano <gscrivan@redhat.com> Reviewed-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Stable-dep-of: b306e90 ("ovl: remove privs in ovl_copyfile()") Signed-off-by: Sasha Levin <sashal@kernel.org>
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