[CIFS] Don't cache timestamps on utimes due to coarse granularity

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / cifs / inode.c

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index cf18ee7655902210240ea0c5281e546370b9d22d..e3fda978f4816eca17b9f5e4194fd161a224c5fe 100644 (file)
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1762,8 +1762,18 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
                                        CIFS_MOUNT_MAP_SPECIAL_CHR);
        }
 
-       if (!rc)
+       if (!rc) {
                rc = inode_setattr(inode, attrs);
+
+               /* force revalidate when any of these times are set since some
+                  of the fs types (eg ext3, fat) do not have fine enough
+                  time granularity to match protocol, and we do not have a
+                  a way (yet) to query the server fs's time granularity (and
+                  whether it rounds times down).
+               */
+               if (!rc && (attrs->ia_valid & (ATTR_MTIME | ATTR_CTIME)))
+                       cifsInode->time = 0;
+       }
 out:
        kfree(args);
        kfree(full_path);