truncate,shmem: Add truncate_inode_folio()
Convert all callers of truncate_inode_page() to call truncate_inode_folio() instead, and move the declaration to mm/internal.h. Move the assertion that the caller is not passing in a tail page to generic_error_remove_page(). We can't entirely remove the struct page from the callers yet because the page pointer in the pvec might be a shadow/dax/swap entry instead of actually a page. Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: William Kucharski <william.kucharski@oracle.com>
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