分片

 

https://www.cnblogs.com/eczhou/p/7860659.html

 

https://blog.csdn.net/Jetway_wmn/article/details/7344792

 

f_info.st_size,c,sum(c) 18803856 [4194304, 4194304, 4194304, 4194304, 2026640] 18803856