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| author |   Vishal Moola (Oracle) <vishal.moola@gmail.com> | 2023-01-04 13:14:26 -0800 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2023-02-02 22:33:13 -0800 |
| commit | ee7a5906ff08e435ed95ec9fe7c7eed2c11015d2 (patch) | |
| tree | f0432dfe2e1ca6c083082763c5289afa18452612 /include/linux/pagemap.h | |
| parent | mm: fix khugepaged with shmem_enabled=advise (diff) | |
| download | wireguard-linux-ee7a5906ff08e435ed95ec9fe7c7eed2c11015d2.tar.xz wireguard-linux-ee7a5906ff08e435ed95ec9fe7c7eed2c11015d2.zip | |
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>
Diffstat (limited to 'include/linux/pagemap.h')
| -rw-r--r-- | include/linux/pagemap.h | 20 |
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 |