Diff b/w generic_file_read & do_sync_read

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Hello All,

I want to find out the difference between
generic_file_read and do_sync_read. The thing I have
got upto now is that generic_file_read uses the page
cache for doing read therefore we must implement
readpage function with generic_file_read. 

On the other hand do_sync_read uses aio_read function
for doing read. I want a little bit explanation about
the difference b/w these two.

Thanks,
Uzair Lakhani,
Karachi, Pakistan.

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