block: optionally snapshot page contents to provide stable pages during write

[cascardo/linux.git] / include / uapi / linux / fs.h

diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
index 780d4c6..c7fc1e6 100644 (file)
--- a/include/uapi/linux/fs.h
+++ b/include/uapi/linux/fs.h
@@ -86,6 +86,9 @@ struct inodes_stat_t {
 #define MS_KERNMOUNT   (1<<22) /* this is a kern_mount call */
 #define MS_I_VERSION   (1<<23) /* Update inode I_version field */
 #define MS_STRICTATIME (1<<24) /* Always perform atime updates */
+
+/* These sb flags are internal to the kernel */
+#define MS_SNAP_STABLE (1<<27) /* Snapshot pages during writeback, if needed */
 #define MS_NOSEC       (1<<28)
 #define MS_BORN                (1<<29)
 #define MS_ACTIVE      (1<<30)