[PATCH v2 27/32] mm: shmem: export some functions to internal.h

[Pasha Tatashin]

From: Pratyush Yadav <ptyadav@xxxxxxxxx>

shmem_inode_acct_blocks(), shmem_recalc_inode(), and
shmem_add_to_page_cache() are used by shmem_alloc_and_add_folio(). This
functionality will also be used in the future by Live Update
Orchestrator (LUO) to recreate memfd files after a live update.

Signed-off-by: Pratyush Yadav <ptyadav@xxxxxxxxx>
Signed-off-by: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx>
---
 mm/internal.h |  6 ++++++
 mm/shmem.c    | 10 +++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/mm/internal.h b/mm/internal.h
index 6b8ed2017743..991917a8ae23 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1535,6 +1535,12 @@ void __meminit __init_page_from_nid(unsigned long pfn, int nid);
 unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg,
 			  int priority);
 
+int shmem_add_to_page_cache(struct folio *folio,
+			    struct address_space *mapping,
+			    pgoff_t index, void *expected, gfp_t gfp);
+int shmem_inode_acct_blocks(struct inode *inode, long pages);
+void shmem_recalc_inode(struct inode *inode, long alloced, long swapped);
+
 #ifdef CONFIG_SHRINKER_DEBUG
 static inline __printf(2, 0) int shrinker_debugfs_name_alloc(
 			struct shrinker *shrinker, const char *fmt, va_list ap)
diff --git a/mm/shmem.c b/mm/shmem.c
index d1e74f59cdba..4a616fe595e2 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -219,7 +219,7 @@ static inline void shmem_unacct_blocks(unsigned long flags, long pages)
 		vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE));
 }
 
-static int shmem_inode_acct_blocks(struct inode *inode, long pages)
+int shmem_inode_acct_blocks(struct inode *inode, long pages)
 {
 	struct shmem_inode_info *info = SHMEM_I(inode);
 	struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb);
@@ -433,7 +433,7 @@ static void shmem_free_inode(struct super_block *sb, size_t freed_ispace)
  * But normally   info->alloced == inode->i_mapping->nrpages + info->swapped
  * So mm freed is info->alloced - (inode->i_mapping->nrpages + info->swapped)
  */
-static void shmem_recalc_inode(struct inode *inode, long alloced, long swapped)
+void shmem_recalc_inode(struct inode *inode, long alloced, long swapped)
 {
 	struct shmem_inode_info *info = SHMEM_I(inode);
 	long freed;
@@ -879,9 +879,9 @@ static void shmem_update_stats(struct folio *folio, int nr_pages)
 /*
  * Somewhat like filemap_add_folio, but error if expected item has gone.
  */
-static int shmem_add_to_page_cache(struct folio *folio,
-				   struct address_space *mapping,
-				   pgoff_t index, void *expected, gfp_t gfp)
+int shmem_add_to_page_cache(struct folio *folio,
+			    struct address_space *mapping,
+			    pgoff_t index, void *expected, gfp_t gfp)
 {
 	XA_STATE_ORDER(xas, &mapping->i_pages, index, folio_order(folio));
 	long nr = folio_nr_pages(folio);
-- 
2.50.0.727.gbf7dc18ff4-goog