ceph: compare fsc->max_file_size and inode->i_size for max file size limit

In ceph_llseek(), we compare fsc->max_file_size and inode->i_size to
choose max file size limit.
Signed-off-by: NChengguang Xu <cgxu519@gmx.com>
Reviewed-by: N"Yan, Zheng" <zyan@redhat.com>
Signed-off-by: NIlya Dryomov <idryomov@gmail.com>

fs/ceph/file.c

@@ -1554,6 +1554,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
 static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
 {
 	struct inode *inode = file->f_mapping->host;
+	struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
 	loff_t i_size;
 	loff_t ret;
 
@@ -1598,7 +1599,7 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
 		break;
 	}
 
-	ret = vfs_setpos(file, offset, inode->i_sb->s_maxbytes);
+	ret = vfs_setpos(file, offset, max(i_size, fsc->max_file_size));
 
 out:
 	inode_unlock(inode);