Patch "btrfs: add set_folio_extent_mapped() helper" has been added to the 6.8-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    btrfs: add set_folio_extent_mapped() helper

to the 6.8-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     btrfs-add-set_folio_extent_mapped-helper.patch
and it can be found in the queue-6.8 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 400a580343a18afb89d345c37c0000abd7cf9091
Author: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Date:   Thu Dec 14 16:13:29 2023 +0000

    btrfs: add set_folio_extent_mapped() helper
    
    [ Upstream commit dfba9f47730604a46c284f6099a11c5686b6289d ]
    
    Turn set_page_extent_mapped() into a wrapper around this version.
    Saves a call to compound_head() for callers who already have a folio
    and removes a couple of users of page->mapping.
    
    Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
    Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
    Reviewed-by: David Sterba <dsterba@xxxxxxxx>
    Signed-off-by: David Sterba <dsterba@xxxxxxxx>
    Stable-dep-of: 86211eea8ae1 ("btrfs: qgroup: validate btrfs_qgroup_inherit parameter")
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 7761d7d93ba98..8b88cd08ab053 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -936,17 +936,21 @@ static int attach_extent_buffer_folio(struct extent_buffer *eb,
 
 int set_page_extent_mapped(struct page *page)
 {
-	struct folio *folio = page_folio(page);
+	return set_folio_extent_mapped(page_folio(page));
+}
+
+int set_folio_extent_mapped(struct folio *folio)
+{
 	struct btrfs_fs_info *fs_info;
 
-	ASSERT(page->mapping);
+	ASSERT(folio->mapping);
 
 	if (folio_test_private(folio))
 		return 0;
 
-	fs_info = btrfs_sb(page->mapping->host->i_sb);
+	fs_info = btrfs_sb(folio->mapping->host->i_sb);
 
-	if (btrfs_is_subpage(fs_info, page->mapping))
+	if (btrfs_is_subpage(fs_info, folio->mapping))
 		return btrfs_attach_subpage(fs_info, folio, BTRFS_SUBPAGE_DATA);
 
 	folio_attach_private(folio, (void *)EXTENT_FOLIO_PRIVATE);
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index 46050500529bf..2c9d6570b0a38 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -221,6 +221,7 @@ int btree_write_cache_pages(struct address_space *mapping,
 void extent_readahead(struct readahead_control *rac);
 int extent_fiemap(struct btrfs_inode *inode, struct fiemap_extent_info *fieinfo,
 		  u64 start, u64 len);
+int set_folio_extent_mapped(struct folio *folio);
 int set_page_extent_mapped(struct page *page);
 void clear_page_extent_mapped(struct page *page);