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authorVishal Moola (Oracle) <vishal.moola@gmail.com>2023-01-05 00:14:26 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-03 09:33:13 +0300
commitee7a5906ff08e435ed95ec9fe7c7eed2c11015d2 (patch)
treef0432dfe2e1ca6c083082763c5289afa18452612
parent2cf1338454a8a9a0b3c1271ccb521afa2d6ae241 (diff)
downloadlinux-ee7a5906ff08e435ed95ec9fe7c7eed2c11015d2.tar.xz
pagemap: add filemap_grab_folio()
Patch series "Convert to filemap_get_folios_tag()", v5. This patch series replaces find_get_pages_range_tag() with filemap_get_folios_tag(). This also allows the removal of multiple calls to compound_head() throughout. It also makes a good chunk of the straightforward conversions to folios, and takes the opportunity to introduce a function that grabs a folio from the pagecache. This patch (of 23): Add function filemap_grab_folio() to grab a folio from the page cache. This function is meant to serve as a folio replacement for grab_cache_page, and is used to facilitate the removal of find_get_pages_range_tag(). Link: https://lkml.kernel.org/r/20230104211448.4804-1-vishal.moola@gmail.com Link: https://lkml.kernel.org/r/20230104211448.4804-2-vishal.moola@gmail.com Signed-off-by: Vishal Moola (Oracle) <vishal.moola@gmail.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
-rw-r--r--include/linux/pagemap.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 29e1f9e76eb6..468183be67be 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -547,6 +547,26 @@ static inline struct folio *filemap_lock_folio(struct address_space *mapping,
}
/**
+ * filemap_grab_folio - grab a folio from the page cache
+ * @mapping: The address space to search
+ * @index: The page index
+ *
+ * Looks up the page cache entry at @mapping & @index. If no folio is found,
+ * a new folio is created. The folio is locked, marked as accessed, and
+ * returned.
+ *
+ * Return: A found or created folio. NULL if no folio is found and failed to
+ * create a folio.
+ */
+static inline struct folio *filemap_grab_folio(struct address_space *mapping,
+ pgoff_t index)
+{
+ return __filemap_get_folio(mapping, index,
+ FGP_LOCK | FGP_ACCESSED | FGP_CREAT,
+ mapping_gfp_mask(mapping));
+}
+
+/**
* find_get_page - find and get a page reference
* @mapping: the address_space to search
* @offset: the page index