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SubjectRe: [PLEASE-TESTME] Zerocopy networking patch, 2.4.0-1
   Date: Tue, 9 Jan 2001 11:31:45 +0100
From: Christoph Hellwig <>

Yuck. A new file_opo just to get a few benchmarks right ... I
hope the writepages stuff will not be merged in Linus tree (but I
wish the code behind it!)

It's a "I know how to send a page somewhere via this filedescriptor
all by myself" operation. I don't see why people need to take
painkillers over this for 2.4.x. I think f_op->write is stupid, such
a special case file operation just to get a few benchmarks right.
This is the kind of argument I am hearing.

Orthogonal to f_op->write being for specifying a low-level
implementation of sys_write, f_op->writepage is for specifying a
low-level implementation of sys_sendfile. Can you grok that?

Linus has already seen this. Originally he had a gripe because in an
older revision of the code used to allow multiple pages to be passed
in an array to the writepage(s) operation. He didn't like that, so I
made it take only one page as he requested. He had no other major
objections to the infrastructure.

David S. Miller
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