linux-kernel - [PATCH] fs: afs: Adding new return type vm_fault

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Date:   Mon, 2 Jul 2018 20:50:17 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     akpm@...ux-foundation.org
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-kernel@...r.kernel.org, willy@...radead.org
Subject: [PATCH] fs: afs: Adding new return type vm_fault_t

Use new return type vm_fault_t for fault handler
in struct vm_operations_struct. For now, this is
just documenting that the function returns a 
VM_FAULT value rather than an errno.  Once all
instances are converted, vm_fault_t will become
a distinct type.

see commit 1c8f422059ae ("mm: change return type to
vm_fault_t") for reference.

Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
Reviewed-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
 fs/afs/internal.h | 3 ++-
 fs/afs/write.c    | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index f38d6a5..35e405c 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -21,6 +21,7 @@
 #include <linux/fscache.h>
 #include <linux/backing-dev.h>
 #include <linux/uuid.h>
+#include <linux/mm_types.h>
 #include <net/net_namespace.h>
 #include <net/af_rxrpc.h>

@@ -949,7 +950,7 @@ extern int afs_write_end(struct file *file, struct address_space *mapping,
 extern ssize_t afs_file_write(struct kiocb *, struct iov_iter *);
 extern int afs_flush(struct file *, fl_owner_t);
 extern int afs_fsync(struct file *, loff_t, loff_t, int);
-extern int afs_page_mkwrite(struct vm_fault *);
+extern vm_fault_t afs_page_mkwrite(struct vm_fault *vmf);
 extern void afs_prune_wb_keys(struct afs_vnode *);
 extern int afs_launder_page(struct page *);

diff --git a/fs/afs/write.c b/fs/afs/write.c
index 9370e2f..5c41274 100644
--- a/fs/afs/write.c
+++ b/fs/afs/write.c
@@ -751,7 +751,7 @@ int afs_flush(struct file *file, fl_owner_t id)
  * notification that a previously read-only page is about to become writable
  * - if it returns an error, the caller will deliver a bus error signal
  */
-int afs_page_mkwrite(struct vm_fault *vmf)
+vm_fault_t afs_page_mkwrite(struct vm_fault *vmf)
 {
 	struct file *file = vmf->vma->vm_file;
 	struct inode *inode = file_inode(file);
--
1.9.1