Messages in this thread | | | From | Andy Lutomirski <> | Date | Thu, 7 Nov 2019 10:16:13 -0800 | Subject | Re: [RFC PATCH 04/14] pipe: Add O_NOTIFICATION_PIPE [ver #2] |
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On Thu, Nov 7, 2019 at 5:39 AM David Howells <dhowells@redhat.com> wrote: > > Add an O_NOTIFICATION_PIPE flag that can be passed to pipe2() to indicate > that the pipe being created is going to be used for notifications. This > suppresses the use of splice(), vmsplice(), tee() and sendfile() on the > pipe as calling iov_iter_revert() on a pipe when a kernel notification > message has been inserted into the middle of a multi-buffer splice will be > messy.
How messy? And is there some way to make it impossible for this to happen? Adding a new flag to pipe2() to avoid messy kernel code seems like a poor tradeoff.
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