quoted

--- linux-next.orig/fs/read_write.c	2011-11-20 22:02:01.000000000 +0800
+++ linux-next/fs/read_write.c	2011-11-20 22:02:03.000000000 +0800

@@ -47,6 +47,10 @@ static loff_t lseek_execute(struct file 
 		file->f_pos = offset;
 		file->f_version = 0;
 	}
+
+	if (!(file->f_ra.ra_flags & READAHEAD_LSEEK))
+		file->f_ra.ra_flags |= READAHEAD_LSEEK;
+
 	return offset;
 }

Confused.  How does READAHEAD_LSEEK get cleared again?

I thought it's not necessary (at least for this case). But yeah, it's
good to clear it to make it more reasonable and avoid unexpected things.

And it would be simple to do, in ra_submit():

-       ra->ra_flags &= ~READAHEAD_MMAP;
+       ra->ra_flags &= ~(READAHEAD_MMAP | READAHEAD_LSEEK);

Thanks,
Fengguang

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