[PATCH v7 26/61] page cache: Add page_cache_range_empty function

From: Matthew Wilcox btrfs has its own custom function for determining whether the page cache has any pages in a particular range. Move this functionality to the page cache, and call it from btrfs. Signed-off-by: Matthew Wilcox ---

[PATCH v7 26/61] page cache: Add page_cache_range_empty function

From: Matthew Wilcox btrfs has its own custom function for determining whether the page cache has any pages in a particular range. Move this functionality to the page cache, and call it from btrfs. Signed-off-by: Matthew Wilcox --- fs/btrfs/btrfs_inode.h | 7 - fs/btrfs/inode.c