Commit 8549a26308f9 for kernel

commit 8549a26308f945bddb39391643eb102da026f0ef
Author: David Howells <dhowells@redhat.com>
Date:   Wed Aug 10 18:52:47 2022 +0100

    afs: Enable multipage folio support

    Enable multipage folio support for the afs filesystem.

    Support has already been implemented in netfslib, fscache and cachefiles
    and in most of afs, but I've waited for Matthew Wilcox's latest folio
    changes.

    Note that it does require a change to afs_write_begin() to return the
    correct subpage.  This is a "temporary" change as we're working on
    getting rid of the need for ->write_begin() and ->write_end()
    completely, at least as far as network filesystems are concerned - but
    it doesn't prevent afs from making use of the capability.

    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Matthew Wilcox (Oracle) <willy@infradead.org>
    Tested-by: kafs-testing@auristor.com
    Cc: Marc Dionne <marc.dionne@auristor.com>
    Cc: linux-afs@lists.infradead.org
    Link: https://lore.kernel.org/lkml/2274528.1645833226@warthog.procyon.org.uk/
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 64dab70d4a4f..6d3a3dbe4928 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -104,12 +104,14 @@ static int afs_inode_init_from_status(struct afs_operation *op,
 		inode->i_op	= &afs_file_inode_operations;
 		inode->i_fop	= &afs_file_operations;
 		inode->i_mapping->a_ops	= &afs_file_aops;
+		mapping_set_large_folios(inode->i_mapping);
 		break;
 	case AFS_FTYPE_DIR:
 		inode->i_mode	= S_IFDIR |  (status->mode & S_IALLUGO);
 		inode->i_op	= &afs_dir_inode_operations;
 		inode->i_fop	= &afs_dir_file_operations;
 		inode->i_mapping->a_ops	= &afs_dir_aops;
+		mapping_set_large_folios(inode->i_mapping);
 		break;
 	case AFS_FTYPE_SYMLINK:
 		/* Symlinks with a mode of 0644 are actually mountpoints. */
diff --git a/fs/afs/write.c b/fs/afs/write.c
index 2c885b22de34..9ebdd36eaf2f 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -91,7 +91,7 @@ int afs_write_begin(struct file *file, struct address_space *mapping,
 			goto flush_conflicting_write;
 	}

-	*_page = &folio->page;
+	*_page = folio_file_page(folio, pos / PAGE_SIZE);
 	_leave(" = 0");
 	return 0;