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btrfs: add set_folio_extent_mapped() helper
[ Upstream commit dfba9f4 ] Turn set_page_extent_mapped() into a wrapper around this version. Saves a call to compound_head() for callers who already have a folio and removes a couple of users of page->mapping. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Stable-dep-of: 86211ee ("btrfs: qgroup: validate btrfs_qgroup_inherit parameter") Signed-off-by: Sasha Levin <sashal@kernel.org>
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