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Add support for ext_pgs mbufs to nfscl_reqstart() and nfsm_set().

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This is another in the 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 2020-07-04 03:28:13 +00:00
parent 957a8d7e74
commit dccb580624
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362917
1 changed files with 45 additions and 8 deletions
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53
sys/fs/nfs/nfs_commonsubs.c
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@ -359,13 +359,19 @@ nfscl_reqstart(struct nfsrv_descript *nd, int procnum, struct nfsmount *nmp,
/*
* Get the first mbuf for the request.
*/
if (nfs_bigrequest[procnum])
NFSMCLGET(mb, M_WAITOK);
else
NFSMGET(mb);
mb->m_len = 0;
nd->nd_mreq = nd->nd_mb = mb;
nd->nd_bpos = mtod(mb, char *);
if ((nd->nd_flag & ND_EXTPG) != 0) {
mb = mb_alloc_ext_plus_pages(PAGE_SIZE, M_WAITOK);
nd->nd_mreq = nd->nd_mb = mb;
nfsm_set(nd, 0);
} else {
if (nfs_bigrequest[procnum])
NFSMCLGET(mb, M_WAITOK);
else
NFSMGET(mb);
mb->m_len = 0;
nd->nd_mreq = nd->nd_mb = mb;
nd->nd_bpos = mtod(mb, char *);
}
/*
* And fill the first file handle into the request.
@ -4804,7 +4810,38 @@ void
nfsm_set(struct nfsrv_descript *nd, u_int offs)
{
struct mbuf *m;
int rlen;
m = nd->nd_mb;
nd->nd_bpos = mtod(m, char *) + offs;
if ((m->m_flags & M_EXTPG) != 0) {
nd->nd_bextpg = 0;
while (offs > 0) {
if (nd->nd_bextpg == 0)
rlen = m_epg_pagelen(m, 0, m->m_epg_1st_off);
else
rlen = m_epg_pagelen(m, nd->nd_bextpg, 0);
if (offs <= rlen)
break;
offs -= rlen;
nd->nd_bextpg++;
if (nd->nd_bextpg == m->m_epg_npgs) {
printf("nfsm_set: build offs "
"out of range\n");
nd->nd_bextpg--;
break;
}
}
nd->nd_bpos = (char *)(void *)
PHYS_TO_DMAP(m->m_epg_pa[nd->nd_bextpg]);
if (nd->nd_bextpg == 0)
nd->nd_bpos += m->m_epg_1st_off;
if (offs > 0) {
nd->nd_bpos += offs;
nd->nd_bextpgsiz = rlen - offs;
} else if (nd->nd_bextpg == 0)
nd->nd_bextpgsiz = PAGE_SIZE - m->m_epg_1st_off;
else
nd->nd_bextpgsiz = PAGE_SIZE;
} else
nd->nd_bpos = mtod(m, char *) + offs;
}