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Add support for ext_pgs mbufs to nfsm_build().

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This is the first of a series of commits that add support to the NFS client
and server for building RPC messages in ext_pgs mbufs with anonymous pages.
This is useful so that the entire mbuf list does not need to be
copied before calling sosend() when NFS over TLS is enabled.

Since ND_EXTPG is never set yet, there is no semantic change at this time.
This commit is contained in:
Rick Macklem 2020-07-03 01:19:29 +00:00
parent b0ee263dbd
commit 2da1527844
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362903
2 changed files with 17 additions and 3 deletions
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17
sys/fs/nfs/nfsm_subs.h
View File

@ -64,14 +64,27 @@ nfsm_build(struct nfsrv_descript *nd, int siz)
void *retp;
struct mbuf *mb2;
if (siz > M_TRAILINGSPACE(nd->nd_mb)) {
if ((nd->nd_flag & ND_EXTPG) == 0 &&
siz > M_TRAILINGSPACE(nd->nd_mb)) {
NFSMCLGET(mb2, M_NOWAIT);
if (siz > MLEN)
panic("build > MLEN");
mb2->m_len = 0;
nd->nd_bpos = mtod(mb2, caddr_t);
nd->nd_bpos = mtod(mb2, char *);
nd->nd_mb->m_next = mb2;
nd->nd_mb = mb2;
} else if ((nd->nd_flag & ND_EXTPG) != 0) {
if (siz > nd->nd_bextpgsiz) {
mb2 = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK);
nd->nd_bpos = (char *)(void *)
PHYS_TO_DMAP(mb2->m_epg_pa[0]);
nd->nd_bextpg = 0;
nd->nd_bextpgsiz = PAGE_SIZE - siz;
nd->nd_mb->m_next = mb2;
nd->nd_mb = mb2;
} else
nd->nd_bextpgsiz -= siz;
nd->nd_mb->m_epg_last_len += siz;
}
retp = (void *)(nd->nd_bpos);
nd->nd_mb->m_len += siz;

3
sys/fs/nfs/nfsport.h
View File

@ -109,8 +109,9 @@
#include <ufs/ufs/ufsmount.h>
#include <vm/uma.h>
#include <vm/vm.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_object.h>
#include <vm/vm_param.h>
#include <nfs/nfssvc.h>
#include "opt_nfs.h"
#include "opt_ufs.h"