Where does a process wait after requesting some data file ?

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Hello,

Let's say that a process wants to read a page of data stored in a file.
For that it issues a sys_read().

Now the data page is not in the page cache and it must be fetched from
the disk.

So I assume while the data page is recovered from the disk, the process
is suspended until the data are ready to be read.

Could anybody show me where in the source code where the process is
suspended ?

Thanks
-- 
Francis
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