linux-kernel - [PATCH] afs: Enable multipage folio support

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Date:   Fri, 25 Feb 2022 23:53:46 +0000
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
cc:     dhowells@...hat.com, jlayton@...nel.org,
        Marc Dionne <marc.dionne@...istor.com>,
        linux-afs@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] afs: Enable multipage folio support

Enable multipage folio support for the afs filesystem.  This is on top of
Matthew Wilcox's for-next branch.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Matthew Wilcox <willy@...radead.org>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
---
 fs/afs/inode.c |    2 ++
 fs/afs/write.c |    2 +-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 5964f8aee090..7dc7eb5f8e63 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -96,12 +96,14 @@ 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 5e9157d0da29..d6cc0fa44316 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;