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filemap: add mapping_read_folio_gfp() 

This is like read_cache_page_gfp() except it returns the folio instead
of the precise page.

Link: https://lkml.kernel.org/r/20230206162520.4029022-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Charan Teja Kalla <quic_charante@quicinc.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Mark Hemment <markhemm@googlemail.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Pavankumar Kondeti <quic_pkondeti@quicinc.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-02-06 16:25:19 +00:00 committed by Andrew Morton
parent aa02d3c174
commit 3e629597b8
2 changed files with 26 additions and 0 deletions
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2
include/linux/pagemap.h
View File

@ -756,6 +756,8 @@ static inline struct page *grab_cache_page(struct address_space *mapping,
struct folio *read_cache_folio(struct address_space *, pgoff_t index,
filler_t *filler, struct file *file);
struct folio *mapping_read_folio_gfp(struct address_space *, pgoff_t index,
gfp_t flags);
struct page *read_cache_page(struct address_space *, pgoff_t index,
filler_t *filler, struct file *file);
extern struct page * read_cache_page_gfp(struct address_space *mapping,

24
mm/filemap.c
View File

@ -3585,6 +3585,30 @@ struct folio *read_cache_folio(struct address_space *mapping, pgoff_t index,
}
EXPORT_SYMBOL(read_cache_folio);
/**
* mapping_read_folio_gfp - Read into page cache, using specified allocation flags.
* @mapping: The address_space for the folio.
* @index: The index that the allocated folio will contain.
* @gfp: The page allocator flags to use if allocating.
*
* This is the same as "read_cache_folio(mapping, index, NULL, NULL)", but with
* any new memory allocations done using the specified allocation flags.
*
* The most likely error from this function is EIO, but ENOMEM is
* possible and so is EINTR. If ->read_folio returns another error,
* that will be returned to the caller.
*
* The function expects mapping->invalidate_lock to be already held.
*
* Return: Uptodate folio on success, ERR_PTR() on failure.
*/
struct folio *mapping_read_folio_gfp(struct address_space *mapping,
pgoff_t index, gfp_t gfp)
{
return do_read_cache_folio(mapping, index, NULL, NULL, gfp);
}
EXPORT_SYMBOL(mapping_read_folio_gfp);
static struct page *do_read_cache_page(struct address_space *mapping,
pgoff_t index, filler_t *filler, struct file *file, gfp_t gfp)
{