CVSROOT: /cvs
Module name: src
Changes by: m...@cvs.openbsd.org 2025/01/04 08:57:02
Modified files:
sys/kern : uipc_socket.c
sys/netinet : tcp_usrreq.c
Log message:
Relax sockets splicing locking.
Sockets splicing works around sockets buffers which have their own locks
for all socket types, especially sblock() on `so_snd' which keeps
sockets being spliced.
- sosplice() does read-only sockets options and state checks, the only
modification is `so_sp' assignment. The SB_SPLICE bit modification,
`ssp_socket' and `ssp_soback' assignment protected with `sb_mtx'
mutex(9). PCB layer does corresponding checks with `sb_mtx' held, so
shared solock() is pretty enough in sosplice() path. Introduce
special sosplice_solock_pair() for that purpose.
- sounsplice() requires shared socket lock only around so{r,w}wakeup
calls.
- Push exclusive solock() down to tcp(4) case of somove(). Such sockets
are not ready do unlocked somove() yet.
ok bluhm
