fuse: Getting file for writeback helper

There will be a .writepageS callback implementation which will need to
get a fuse_file out of a fuse_inode, thus make a helper for this.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 4598345..aab6d05 100644 (file)
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -1494,6 +1494,20 @@ static void fuse_writepage_end(struct fuse_conn *fc, struct fuse_req *req)
        fuse_writepage_free(fc, req);
 }
 
+static struct fuse_file *fuse_write_file(struct fuse_conn *fc,
+                                        struct fuse_inode *fi)
+{
+       struct fuse_file *ff;
+
+       spin_lock(&fc->lock);
+       BUG_ON(list_empty(&fi->write_files));
+       ff = list_entry(fi->write_files.next, struct fuse_file, write_entry);
+       fuse_file_get(ff);
+       spin_unlock(&fc->lock);
+
+       return ff;
+}
+
 static int fuse_writepage_locked(struct page *page)
 {
        struct address_space *mapping = page->mapping;
@@ -1501,7 +1515,6 @@ static int fuse_writepage_locked(struct page *page)
        struct fuse_conn *fc = get_fuse_conn(inode);
        struct fuse_inode *fi = get_fuse_inode(inode);
        struct fuse_req *req;
-       struct fuse_file *ff;
        struct page *tmp_page;
 
        set_page_writeback(page);
@@ -1515,13 +1528,8 @@ static int fuse_writepage_locked(struct page *page)
        if (!tmp_page)
                goto err_free;
 
-       spin_lock(&fc->lock);
-       BUG_ON(list_empty(&fi->write_files));
-       ff = list_entry(fi->write_files.next, struct fuse_file, write_entry);
-       req->ff = fuse_file_get(ff);
-       spin_unlock(&fc->lock);
-
-       fuse_write_fill(req, ff, page_offset(page), 0);
+       req->ff = fuse_write_file(fc, fi);
+       fuse_write_fill(req, req->ff, page_offset(page), 0);
 
        copy_highpage(tmp_page, page);
        req->misc.write.in.write_flags |= FUSE_WRITE_CACHE;