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Differential D44150

mbuf: provide mc_uiotomc() a function to copy from uio(9) to mchain
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Authored by glebius on Feb 29 2024, 7:03 AM.

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tuexen
markj

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transport
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rGaba79b0f4a3f: mbuf: provide mc_uiotomc() a function to copy from uio(9) to mchain

Summary

Implement m_uiotombuf() as a wrapper around mc_uiotomc(). The M_EXTPG is
left untouched. The m_uiotombuf() is left as a compat KPI. New code
should use either mc_uiotomc() or m_uiotombuf_nomap().

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rG FreeBSD src repository

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Build Status

Buildable 56678
Build 53566: arc lint + arc unit

Event Timeline

glebius created this revision.Feb 29 2024, 7:03 AM

Herald added subscribers: olce, imp. · View Herald TranscriptFeb 29 2024, 7:03 AM

glebius requested review of this revision.Feb 29 2024, 7:03 AM

glebius added a parent revision: D44149: mbuf: provide mc_get() that allocates struct mchain of given length.

Harbormaster completed remote builds in B56345: Diff 135209.Feb 29 2024, 7:03 AM

glebius added a child revision: D44151: unix: new implementation of unix/stream & unix/seqpacket.Feb 29 2024, 7:03 AM

tuexen accepted this revision.Feb 29 2024, 9:42 AM

This revision is now accepted and ready to land.Feb 29 2024, 9:42 AM

markj added a subscriber: markj.Mar 15 2024, 12:01 PM

markj added inline comments.

sys/kern/uipc_mbuf.c
2014	It would be nice to explain what "len" and "lspace" are.
2022–2023	Can you get rid of `progress` and just use `mc->mc_len`?
2029	What's the purpose of trying to handle the overflow case? We are silently truncating the uio and creating a 4GB chain, which presumably isn't what the caller wants...?

Review from Mark.

This revision now requires review to proceed.Mar 16 2024, 6:11 PM

Harbormaster completed remote builds in B56648: Diff 135828.Mar 16 2024, 6:11 PM

glebius marked 3 inline comments as done.Mar 16 2024, 6:22 PM

markj accepted this revision as: markj.Mar 18 2024, 5:28 AM

markj added inline comments.

sys/kern/uipc_mbuf.c
2000	I'd also assert that `uio->uio_segflg == UIO_WRITE`.

This revision is now accepted and ready to land.Mar 18 2024, 5:28 AM

Utilize mc_first/etc.
Add assertion uio->uio_segflg == UIO_WRITE.

This revision now requires review to proceed.Mar 18 2024, 6:12 PM

Harbormaster completed remote builds in B56678: Diff 135906.Mar 18 2024, 6:12 PM

Correct UIO assertion.

Harbormaster completed remote builds in B56682: Diff 135913.Mar 18 2024, 7:23 PM

markj accepted this revision as: markj.Mar 19 2024, 5:03 AM

markj added inline comments.

sys/kern/uipc_mbuf.c
2000	Sorry, I meant `uio_rw` of course. But why do you assert `segflg == UIO_USERSPACE`? It should be valid for kernel UIOs as well.

This revision is now accepted and ready to land.Mar 19 2024, 5:03 AM

Don't assert uio is from userspace.

This revision now requires review to proceed.Mar 19 2024, 2:56 PM

Harbormaster completed remote builds in B56695: Diff 135951.Mar 19 2024, 2:56 PM

This revision was not accepted when it landed; it landed in state Needs Review.Apr 8 2024, 8:30 PM

Closed by commit rGaba79b0f4a3f: mbuf: provide mc_uiotomc() a function to copy from uio(9) to mchain (authored by glebius). · Explain Why

This revision was automatically updated to reflect the committed changes.

glebius added a commit: rGaba79b0f4a3f: mbuf: provide mc_uiotomc() a function to copy from uio(9) to mchain.

Revision Contents
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sys/

kern/

126 lines

sys/

1 line

Diff 135906

sys/kern/uipc_mbuf.c

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sys/sys/mbuf.h

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