linux: implement splice(2)

[pitwuu_gmail.com]

Cool. Thanks for working on it. Obviously this is an "emulation" way of implementing splice(2) and not the real thing, but I like this. Do you happen to know which software requires the splice(2) call for its correct operation?

[emaste]

Does this have test coverage via e.g. LTP?

[dchagin]

In D30597#687217, @emaste wrote:

Does this have test coverage via e.g. LTP?

yes, also linux source at tools/testing/selftests/splice

[pitwuu_gmail.com]

In D30597#687263, @dchagin wrote:

In D30597#687217, @emaste wrote:

Does this have test coverage via e.g. LTP?

yes, also linux source at tools/testing/selftests/splice

It passes?

[dchagin]

In D30597#687282, @pitwuu_gmail.com wrote:

In D30597#687263, @dchagin wrote:

In D30597#687217, @emaste wrote:

Does this have test coverage via e.g. LTP?

yes, also linux source at tools/testing/selftests/splice

It passes?

no, copy_file_range does not allow copying to/from pipes, only between vnode backed files

[emaste]

What error does kern_copy_file_range return if passed pipes

[dchagin]

In D30597#688997, @emaste wrote:

What error does kern_copy_file_range return if passed pipes

EINVAL, f_vnode == NULL check

[trasz]

(Tinderboxed.)

[dchagin]

In D30597#690019, @trasz wrote:

(Tinderboxed.)

hmm, why? its unusable any way, at least one fd should be a pipe