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Pass the dentry of a source file and the dentry of a destination directory to lock parent inodes for rename. As soon as this function returns, ->d_parent of the source file dentry is stable and inodes are properly locked for calling vfs-rename. This helper is needed for ksmbd server. rename request of SMB protocol has to rename an opened file, no matter which directory it's in. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>