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authorMatthew Wilcox (Oracle) <willy@infradead.org>2023-02-06 17:25:19 +0100
committerAndrew Morton <akpm@linux-foundation.org>2023-02-10 01:51:42 +0100
commit3e629597b8477efbcc0ad14ee80558a080eebdc3 (patch)
treea0e52ba188837279524c942b2ca1faaaea14a17c /mm
parentmm/page_alloc: reduce fallbacks to (MIGRATE_PCPTYPES - 1) (diff)
downloadlinux-3e629597b8477efbcc0ad14ee80558a080eebdc3.tar.xz
linux-3e629597b8477efbcc0ad14ee80558a080eebdc3.zip
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>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 992554c18f1f..2ebcf500871d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -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)
{