sysv: Convert sysv_set_link() and sysv_dotdot() to take a folio

This matches ext2 and removes a few hidden calls to compound_head().

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
3 files changed