[CIFS] mtime bounces from local to remote when cifs nocmtime i_flags overwritten

atime flag was also overwritten. Noticed by Shirish when he was debugging
an atime problem.  Should help performance a bit too.

cifs should be getting time stamps from the server (that was the original
intent too)
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/cifsfs.c

@@ -91,8 +91,9 @@ cifs_read_super(struct super_block *sb, void *data,
 	struct inode *inode;
 	struct cifs_sb_info *cifs_sb;
 	int rc = 0;
-
-	sb->s_flags |= MS_NODIRATIME; /* and probably even noatime */
+	
+	/* BB should we make this contingent on mount parm? */
+	sb->s_flags |= MS_NODIRATIME | MS_NOATIME;
 	sb->s_fs_info = kzalloc(sizeof(struct cifs_sb_info),GFP_KERNEL);
 	cifs_sb = CIFS_SB(sb);
 	if(cifs_sb == NULL)
@@ -258,7 +259,10 @@ cifs_alloc_inode(struct super_block *sb)
 	cifs_inode->clientCanCacheRead = FALSE;
 	cifs_inode->clientCanCacheAll = FALSE;
 	cifs_inode->vfs_inode.i_blkbits = 14;  /* 2**14 = CIFS_MAX_MSGSIZE */
-	cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;
+	
+	/* Can not set i_flags here - they get immediately overwritten
+	   to zero by the VFS */
+/*	cifs_inode->vfs_inode.i_flags = S_NOATIME | S_NOCMTIME;*/
 	INIT_LIST_HEAD(&cifs_inode->openFileList);
 	return &cifs_inode->vfs_inode;
 }

fs/cifs/inode.c

@@ -90,6 +90,9 @@ int cifs_get_inode_info_unix(struct inode **pinode,
 				(*pinode)->i_ino =
 					(unsigned long)findData.UniqueId;
 			} /* note ino incremented to unique num in new_inode */
+			if(sb->s_flags & MS_NOATIME)
+				(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
+				
 			insert_inode_hash(*pinode);
 		}
 
@@ -421,6 +424,8 @@ int cifs_get_inode_info(struct inode **pinode,
 				} else /* do we need cast or hash to ino? */
 					(*pinode)->i_ino = inode_num;
 			} /* else ino incremented to unique num in new_inode*/
+			if(sb->s_flags & MS_NOATIME)
+				(*pinode)->i_flags |= S_NOATIME | S_NOCMTIME;
 			insert_inode_hash(*pinode);
 		}
 		inode = *pinode;

fs/cifs/link.c

@@ -77,7 +77,8 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
 		cifsInode = CIFS_I(old_file->d_inode);
 		if(rc == 0) {
 			old_file->d_inode->i_nlink++;
-			old_file->d_inode->i_ctime = CURRENT_TIME;
+/* BB should we make this contingent on superblock flag NOATIME? */
+/*			old_file->d_inode->i_ctime = CURRENT_TIME;*/
 			/* parent dir timestamps will update from srv
 			within a second, would it really be worth it
 			to set the parent dir cifs inode time to zero

fs/cifs/readdir.c

@@ -83,6 +83,8 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
 				return rc;
 			rc = 1;
 		}
+		if(file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
+			(*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;
 	} else {
 		tmp_dentry = d_alloc(file->f_path.dentry, qstring);
 		if(tmp_dentry == NULL) {
@@ -98,6 +100,8 @@ static int construct_dentry(struct qstr *qstring, struct file *file,
 			tmp_dentry->d_op = &cifs_dentry_ops;
 		if(*ptmp_inode == NULL)
 			return rc;
+		if(file->f_path.dentry->d_sb->s_flags & MS_NOATIME)
+			(*ptmp_inode)->i_flags |= S_NOATIME | S_NOCMTIME;			
 		rc = 2;
 	}