mm: migration: avoid race between shift_arg_pages() and rmap_walk() during migration...

[safe/jmp/linux-2.6] / fs / 9p / v9fs.h

diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index 019f4cc..bec4d0b 100644 (file)
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -20,10 +20,12 @@
  *  Boston, MA  02111-1301  USA
  *
  */
+#include <linux/backing-dev.h>
 
 /**
  * enum p9_session_flags - option flags for each 9P session
- * @V9FS_EXTENDED: whether or not to use 9P2000.u extensions
+ * @V9FS_PROTO_2000U: whether or not to use 9P2000.u extensions
+ * @V9FS_PROTO_2000L: whether or not to use 9P2000.l extensions
  * @V9FS_ACCESS_SINGLE: only the mounting user can access the hierarchy
  * @V9FS_ACCESS_USER: a new attach will be issued for every user (default)
  * @V9FS_ACCESS_ANY: use a single attach for all users
@@ -32,11 +34,12 @@
  * Session flags reflect options selected by users at mount time
  */
 enum p9_session_flags {
-       V9FS_EXTENDED           = 0x01,
-       V9FS_ACCESS_SINGLE      = 0x02,
-       V9FS_ACCESS_USER        = 0x04,
-       V9FS_ACCESS_ANY         = 0x06,
-       V9FS_ACCESS_MASK        = 0x06,
+       V9FS_PROTO_2000U        = 0x01,
+       V9FS_PROTO_2000L        = 0x02,
+       V9FS_ACCESS_SINGLE      = 0x04,
+       V9FS_ACCESS_USER        = 0x08,
+       V9FS_ACCESS_ANY         = 0x0C,
+       V9FS_ACCESS_MASK        = 0x0C,
 };
 
 /* possible values of ->cache */
@@ -100,12 +103,14 @@ struct v9fs_session_info {
        u32 uid;                /* if ACCESS_SINGLE, the uid that has access */
        struct p9_client *clnt; /* 9p client */
        struct list_head slist; /* list of sessions registered with v9fs */
+       struct backing_dev_info bdi;
 };
 
 struct p9_fid *v9fs_session_init(struct v9fs_session_info *, const char *,
                                                                        char *);
 void v9fs_session_close(struct v9fs_session_info *v9ses);
 void v9fs_session_cancel(struct v9fs_session_info *v9ses);
+void v9fs_session_begin_cancel(struct v9fs_session_info *v9ses);
 
 #define V9FS_MAGIC 0x01021997
 
@@ -121,7 +126,12 @@ static inline struct v9fs_session_info *v9fs_inode2v9ses(struct inode *inode)
        return (inode->i_sb->s_fs_info);
 }
 
-static inline int v9fs_extended(struct v9fs_session_info *v9ses)
+static inline int v9fs_proto_dotu(struct v9fs_session_info *v9ses)
 {
-       return v9ses->flags & V9FS_EXTENDED;
+       return v9ses->flags & V9FS_PROTO_2000U;
+}
+
+static inline int v9fs_proto_dotl(struct v9fs_session_info *v9ses)
+{
+       return v9ses->flags & V9FS_PROTO_2000L;
 }