cifs: allow caller to specify completion op when allocating writedata

We'll need a different set of write completion ops when not writing out
of the pagecache.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>

fs/cifs/cifsproto.h

@@ -495,7 +495,9 @@ struct cifs_writedata {
 };
 
 int cifs_async_writev(struct cifs_writedata *wdata);
-struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages);
+void cifs_writev_complete(struct work_struct *work);
+struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages,
+						work_func_t complete);
 void cifs_writedata_release(struct kref *refcount);
 
 #endif			/* _CIFSPROTO_H */

fs/cifs/cifssmb.c

@@ -2035,7 +2035,7 @@ cifs_writev_requeue(struct cifs_writedata *wdata)
 	kref_put(&wdata->refcount, cifs_writedata_release);
 }
 
-static void
+void
 cifs_writev_complete(struct work_struct *work)
 {
 	struct cifs_writedata *wdata = container_of(work,
@@ -2065,7 +2065,7 @@ cifs_writev_complete(struct work_struct *work)
 }
 
 struct cifs_writedata *
-cifs_writedata_alloc(unsigned int nr_pages)
+cifs_writedata_alloc(unsigned int nr_pages, work_func_t complete)
 {
 	struct cifs_writedata *wdata;
 
@@ -2079,7 +2079,7 @@ cifs_writedata_alloc(unsigned int nr_pages)
 	wdata = kzalloc(sizeof(*wdata) +
 			sizeof(struct page *) * (nr_pages - 1), GFP_NOFS);
 	if (wdata != NULL) {
-		INIT_WORK(&wdata->work, cifs_writev_complete);
+		INIT_WORK(&wdata->work, complete);
 		kref_init(&wdata->refcount);
 	}
 	return wdata;

fs/cifs/file.c

@@ -1684,7 +1684,8 @@ static int cifs_writepages(struct address_space *mapping,
 		tofind = min((cifs_sb->wsize / PAGE_CACHE_SIZE) - 1,
 				end - index) + 1;
 
-		wdata = cifs_writedata_alloc((unsigned int)tofind);
+		wdata = cifs_writedata_alloc((unsigned int)tofind,
+					     cifs_writev_complete);
 		if (!wdata) {
 			rc = -ENOMEM;
 			break;