I know how some system calls like sys_read and sys_write work with character device files. If I understand correctly, because character device drivers implement file_operations functions so sys_read and sys_write will call the read and write functions defined and implemented inside character device drivers.
However, I don't know exactly the interaction between sys_read, sys_write and regular files (which are stored in block devices) through VFS, Block subsystem and Block device drivers. I know that in order to read/write block devices, the drivers of the block devices have request functions which manipulate the request queues but when I read the Linux source code (fs/read_write.c), I cannot find any piece of code to make the request and send to any request queues.
Could you help me to clarify the interaction.
Thank you very much.
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zey
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