shmem: remove shmem_getpage()

With all callers removed, remove this wrapper function.  The flags are now
mysteriously called SGP, but I think we can live with that.

Link: https://lkml.kernel.org/r/20220902194653.1739778-34-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

include/linux/shmem_fs.h

@@ -102,7 +102,7 @@ extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
 extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
 						pgoff_t start, pgoff_t end);
 
-/* Flag allocation requirements to shmem_getpage */
+/* Flag allocation requirements to shmem_get_folio */
 enum sgp_type {
 	SGP_READ,	/* don't exceed i_size, don't allocate page */
 	SGP_NOALLOC,	/* similar, but fail on hole or use fallocated page */
@@ -111,8 +111,6 @@ enum sgp_type {
 	SGP_FALLOC,	/* like SGP_WRITE, but make existing page Uptodate */
 };
 
-extern int shmem_getpage(struct inode *inode, pgoff_t index,
-		struct page **pagep, enum sgp_type sgp);
 int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
 		enum sgp_type sgp);
 

mm/shmem.c

@@ -179,7 +179,7 @@ static inline int shmem_reacct_size(unsigned long flags,
 /*
  * ... whereas tmpfs objects are accounted incrementally as
  * pages are allocated, in order to allow large sparse files.
- * shmem_getpage reports shmem_acct_block failure as -ENOSPC not -ENOMEM,
+ * shmem_get_folio reports shmem_acct_block failure as -ENOSPC not -ENOMEM,
  * so that a failure on a sparse tmpfs mapping will give SIGBUS not OOM.
  */
 static inline int shmem_acct_block(unsigned long flags, long pages)
@@ -2031,19 +2031,6 @@ int shmem_get_folio(struct inode *inode, pgoff_t index, struct folio **foliop,
 			mapping_gfp_mask(inode->i_mapping), NULL, NULL, NULL);
 }
 
-int shmem_getpage(struct inode *inode, pgoff_t index,
-		struct page **pagep, enum sgp_type sgp)
-{
-	struct folio *folio = NULL;
-	int ret = shmem_get_folio(inode, index, &folio, sgp);
-
-	if (folio)
-		*pagep = folio_file_page(folio, index);
-	else
-		*pagep = NULL;
-	return ret;
-}
-
 /*
  * This is like autoremove_wake_function, but it removes the wait queue
  * entry unconditionally - even if something else had already woken the