ocfs2: use i_size_read() to access i_size

Though ocfs2 uses inode->i_mutex to protect i_size, there are both
i_size_read/write() and direct accesses.  Clean up all direct access to
eliminate confusion.

Signed-off-by: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Jie Liu <jeff.liu@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/ocfs2/quota_local.c

@@ -982,14 +982,14 @@ static struct ocfs2_quota_chunk *ocfs2_local_quota_add_chunk(
 
 	/* We are protected by dqio_sem so no locking needed */
 	status = ocfs2_extend_no_holes(lqinode, NULL,
-				       lqinode->i_size + 2 * sb->s_blocksize,
-				       lqinode->i_size);
+				       i_size_read(lqinode) + 2 * sb->s_blocksize,
+				       i_size_read(lqinode));
 	if (status < 0) {
 		mlog_errno(status);
 		goto out;
 	}
 	status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
-					  lqinode->i_size + 2 * sb->s_blocksize);
+					  i_size_read(lqinode) + 2 * sb->s_blocksize);
 	if (status < 0) {
 		mlog_errno(status);
 		goto out;
@@ -1125,14 +1125,14 @@ static struct ocfs2_quota_chunk *ocfs2_extend_local_quota_file(
 
 	/* We are protected by dqio_sem so no locking needed */
 	status = ocfs2_extend_no_holes(lqinode, NULL,
-				       lqinode->i_size + sb->s_blocksize,
-				       lqinode->i_size);
+				       i_size_read(lqinode) + sb->s_blocksize,
+				       i_size_read(lqinode));
 	if (status < 0) {
 		mlog_errno(status);
 		goto out;
 	}
 	status = ocfs2_simple_size_update(lqinode, oinfo->dqi_lqi_bh,
-					  lqinode->i_size + sb->s_blocksize);
+					  i_size_read(lqinode) + sb->s_blocksize);
 	if (status < 0) {
 		mlog_errno(status);
 		goto out;