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authorMatthew Wilcox (Oracle) <willy@infradead.org>2023-02-06 19:25:20 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-02-10 03:51:42 +0300
commitf01b2b3ed8735dacd92f1da548708449525e286a (patch)
tree8f0bdad80c64a2cd239cd09ef4b153163acc599c /mm/shmem.c
parent3e629597b8477efbcc0ad14ee80558a080eebdc3 (diff)
downloadlinux-f01b2b3ed8735dacd92f1da548708449525e286a.tar.xz
shmem: add shmem_read_folio() and shmem_read_folio_gfp()
These are the folio replacements for shmem_read_mapping_page() and shmem_read_mapping_page_gfp(). [akpm@linux-foundation.org: fix shmem_read_mapping_page_gfp(), per Matthew] Link: https://lkml.kernel.org/r/Y+QdJTuzxeBYejw2@casper.infradead.org Link: https://lkml.kernel.org/r/20230206162520.4029022-2-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Mark Hemment <markhemm@googlemail.com> Cc: Charan Teja Kalla <quic_charante@quicinc.com> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.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/shmem.c')
-rw-r--r--mm/shmem.c36
1 files changed, 24 insertions, 12 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index 732969afabd1..be6bdd320d5f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -4311,9 +4311,9 @@ int shmem_zero_setup(struct vm_area_struct *vma)
}
/**
- * shmem_read_mapping_page_gfp - read into page cache, using specified page allocation flags.
- * @mapping: the page's address_space
- * @index: the page index
+ * shmem_read_folio_gfp - read into page cache, using specified page allocation flags.
+ * @mapping: the folio's address_space
+ * @index: the folio index
* @gfp: the page allocator flags to use if allocating
*
* This behaves as a tmpfs "read_cache_page_gfp(mapping, index, gfp)",
@@ -4325,13 +4325,12 @@ int shmem_zero_setup(struct vm_area_struct *vma)
* i915_gem_object_get_pages_gtt() mixes __GFP_NORETRY | __GFP_NOWARN in
* with the mapping_gfp_mask(), to avoid OOMing the machine unnecessarily.
*/
-struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
- pgoff_t index, gfp_t gfp)
+struct folio *shmem_read_folio_gfp(struct address_space *mapping,
+ pgoff_t index, gfp_t gfp)
{
#ifdef CONFIG_SHMEM
struct inode *inode = mapping->host;
struct folio *folio;
- struct page *page;
int error;
BUG_ON(!shmem_mapping(mapping));
@@ -4341,6 +4340,25 @@ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
return ERR_PTR(error);
folio_unlock(folio);
+ return folio;
+#else
+ /*
+ * The tiny !SHMEM case uses ramfs without swap
+ */
+ return mapping_read_folio_gfp(mapping, index, gfp);
+#endif
+}
+EXPORT_SYMBOL_GPL(shmem_read_folio_gfp);
+
+struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
+ pgoff_t index, gfp_t gfp)
+{
+ struct folio *folio = shmem_read_folio_gfp(mapping, index, gfp);
+ struct page *page;
+
+ if (IS_ERR(folio))
+ return &folio->page;
+
page = folio_file_page(folio, index);
if (PageHWPoison(page)) {
folio_put(folio);
@@ -4348,11 +4366,5 @@ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
}
return page;
-#else
- /*
- * The tiny !SHMEM case uses ramfs without swap
- */
- return read_cache_page_gfp(mapping, index, gfp);
-#endif
}
EXPORT_SYMBOL_GPL(shmem_read_mapping_page_gfp);