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freebsd-dev/sys/nfsclient/nfs_vfsops.c
Julian Elischer 8b07e49a00 Add code to allow the system to handle multiple routing tables. 
This particular implementation is designed to be fully backwards compatible
and to be MFC-able to 7.x (and 6.x)

Currently the only protocol that can make use of the multiple tables is IPv4
Similar functionality exists in OpenBSD and Linux.

From my notes:

-----

  One thing where FreeBSD has been falling behind, and which by chance I
  have some time to work on is "policy based routing", which allows
  different
  packet streams to be routed by more than just the destination address.

  Constraints:
  ------------

  I want to make some form of this available in the 6.x tree
  (and by extension 7.x) , but FreeBSD in general needs it so I might as
  well do it in -current and back port the portions I need.

  One of the ways that this can be done is to have the ability to
  instantiate multiple kernel routing tables (which I will now
  refer to as "Forwarding Information Bases" or "FIBs" for political
  correctness reasons). Which FIB a particular packet uses to make
  the next hop decision can be decided by a number of mechanisms.
  The policies these mechanisms implement are the "Policies" referred
  to in "Policy based routing".

  One of the constraints I have if I try to back port this work to
  6.x is that it must be implemented as a EXTENSION to the existing
  ABIs in 6.x so that third party applications do not need to be
  recompiled in timespan of the branch.

  This first version will not have some of the bells and whistles that
  will come with later versions. It will, for example, be limited to 16
  tables in the first commit.
  Implementation method, Compatible version. (part 1)
  -------------------------------
  For this reason I have implemented a "sufficient subset" of a
  multiple routing table solution in Perforce, and back-ported it
  to 6.x. (also in Perforce though not  always caught up with what I
  have done in -current/P4). The subset allows a number of FIBs
  to be defined at compile time (8 is sufficient for my purposes in 6.x)
  and implements the changes needed to allow IPV4 to use them. I have not
  done the changes for ipv6 simply because I do not need it, and I do not
  have enough knowledge of ipv6 (e.g. neighbor discovery) needed to do it.

  Other protocol families are left untouched and should there be
  users with proprietary protocol families, they should continue to work
  and be oblivious to the existence of the extra FIBs.

  To understand how this is done, one must know that the current FIB
  code starts everything off with a single dimensional array of
  pointers to FIB head structures (One per protocol family), each of
  which in turn points to the trie of routes available to that family.

  The basic change in the ABI compatible version of the change is to
  extent that array to be a 2 dimensional array, so that
  instead of protocol family X looking at rt_tables[X] for the
  table it needs, it looks at rt_tables[Y][X] when for all
  protocol families except ipv4 Y is always 0.
  Code that is unaware of the change always just sees the first row
  of the table, which of course looks just like the one dimensional
  array that existed before.

  The entry points rtrequest(), rtalloc(), rtalloc1(), rtalloc_ign()
  are all maintained, but refer only to the first row of the array,
  so that existing callers in proprietary protocols can continue to
  do the "right thing".
  Some new entry points are added, for the exclusive use of ipv4 code
  called in_rtrequest(), in_rtalloc(), in_rtalloc1() and in_rtalloc_ign(),
  which have an extra argument which refers the code to the correct row.

  In addition, there are some new entry points (currently called
  rtalloc_fib() and friends) that check the Address family being
  looked up and call either rtalloc() (and friends) if the protocol
  is not IPv4 forcing the action to row 0 or to the appropriate row
  if it IS IPv4 (and that info is available). These are for calling
  from code that is not specific to any particular protocol. The way
  these are implemented would change in the non ABI preserving code
  to be added later.

  One feature of the first version of the code is that for ipv4,
  the interface routes show up automatically on all the FIBs, so
  that no matter what FIB you select you always have the basic
  direct attached hosts available to you. (rtinit() does this
  automatically).

  You CAN delete an interface route from one FIB should you want
  to but by default it's there. ARP information is also available
  in each FIB. It's assumed that the same machine would have the
  same MAC address, regardless of which FIB you are using to get
  to it.

  This brings us as to how the correct FIB is selected for an outgoing
  IPV4 packet.

  Firstly, all packets have a FIB associated with them. if nothing
  has been done to change it, it will be FIB 0. The FIB is changed
  in the following ways.

  Packets fall into one of a number of classes.

  1/ locally generated packets, coming from a socket/PCB.
     Such packets select a FIB from a number associated with the
     socket/PCB. This in turn is inherited from the process,
     but can be changed by a socket option. The process in turn
     inherits it on fork. I have written a utility call setfib
     that acts a bit like nice..

         setfib -3 ping target.example.com # will use fib 3 for ping.

     It is an obvious extension to make it a property of a jail
     but I have not done so. It can be achieved by combining the setfib and
     jail commands.

  2/ packets received on an interface for forwarding.
     By default these packets would use table 0,
     (or possibly a number settable in a sysctl(not yet)).
     but prior to routing the firewall can inspect them (see below).
     (possibly in the future you may be able to associate a FIB
     with packets received on an interface..  An ifconfig arg, but not yet.)

  3/ packets inspected by a packet classifier, which can arbitrarily
     associate a fib with it on a packet by packet basis.
     A fib assigned to a packet by a packet classifier
     (such as ipfw) would over-ride a fib associated by
     a more default source. (such as cases 1 or 2).

  4/ a tcp listen socket associated with a fib will generate
     accept sockets that are associated with that same fib.

  5/ Packets generated in response to some other packet (e.g. reset
     or icmp packets). These should use the FIB associated with the
     packet being reponded to.

  6/ Packets generated during encapsulation.
     gif, tun and other tunnel interfaces will encapsulate using the FIB
     that was in effect withthe proces that set up the tunnel.
     thus setfib 1 ifconfig gif0 [tunnel instructions]
     will set the fib for the tunnel to use to be fib 1.

  Routing messages would be associated with their
  process, and thus select one FIB or another.
  messages from the kernel would be associated with the fib they
  refer to and would only be received by a routing socket associated
  with that fib. (not yet implemented)

  In addition Netstat has been edited to be able to cope with the
  fact that the array is now 2 dimensional. (It looks in system
  memory using libkvm (!)). Old versions of netstat see only the first FIB.

  In addition two sysctls are added to give:
  a) the number of FIBs compiled in (active)
  b) the default FIB of the calling process.

  Early testing experience:
  -------------------------

  Basically our (IronPort's) appliance does this functionality already
  using ipfw fwd but that method has some drawbacks.

  For example,
  It can't fully simulate a routing table because it can't influence the
  socket's choice of local address when a connect() is done.

  Testing during the generating of these changes has been
  remarkably smooth so far. Multiple tables have co-existed
  with no notable side effects, and packets have been routes
  accordingly.

  ipfw has grown 2 new keywords:

  setfib N ip from anay to any
  count ip from any to any fib N

  In pf there seems to be a requirement to be able to give symbolic names to the
  fibs but I do not have that capacity. I am not sure if it is required.

  SCTP has interestingly enough built in support for this, called VRFs
  in Cisco parlance. it will be interesting to see how that handles it
  when it suddenly actually does something.

  Where to next:
  --------------------

  After committing the ABI compatible version and MFCing it, I'd
  like to proceed in a forward direction in -current. this will
  result in some roto-tilling in the routing code.

  Firstly: the current code's idea of having a separate tree per
  protocol family, all of the same format, and pointed to by the
  1 dimensional array is a bit silly. Especially when one considers that
  there is code that makes assumptions about every protocol having the
  same internal structures there. Some protocols don't WANT that
  sort of structure. (for example the whole idea of a netmask is foreign
  to appletalk). This needs to be made opaque to the external code.

  My suggested first change is to add routing method pointers to the
  'domain' structure, along with information pointing the data.
  instead of having an array of pointers to uniform structures,
  there would be an array pointing to the 'domain' structures
  for each protocol address domain (protocol family),
  and the methods this reached would be called. The methods would have
  an argument that gives FIB number, but the protocol would be free
  to ignore it.

  When the ABI can be changed it raises the possibilty of the
  addition of a fib entry into the "struct route". Currently,
  the structure contains the sockaddr of the desination, and the resulting
  fib entry. To make this work fully, one could add a fib number
  so that given an address and a fib, one can find the third element, the
  fib entry.

  Interaction with the ARP layer/ LL layer would need to be
  revisited as well. Qing Li has been working on this already.

  This work was sponsored by Ironport Systems/Cisco

Reviewed by:    several including rwatson, bz and mlair (parts each)
Obtained from:  Ironport systems/Cisco
2008-05-09 23:03:00 +00:00

1165 lines
33 KiB
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/*-
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_bootp.h"
#include "opt_nfsroot.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/mount.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/signalvar.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/uma.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <rpc/rpcclnt.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfsclient/nfs.h>
#include <nfsclient/nfsnode.h>
#include <nfsclient/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfsclient/nfsm_subs.h>
#include <nfsclient/nfsdiskless.h>
MALLOC_DEFINE(M_NFSREQ, "nfsclient_req", "NFS request header");
MALLOC_DEFINE(M_NFSBIGFH, "nfsclient_bigfh", "NFS version 3 file handle");
MALLOC_DEFINE(M_NFSDIROFF, "nfsclient_diroff", "NFS directory offset data");
MALLOC_DEFINE(M_NFSHASH, "nfsclient_hash", "NFS hash tables");
MALLOC_DEFINE(M_NFSDIRECTIO, "nfsclient_directio", "NFS Direct IO async write state");
uma_zone_t nfsmount_zone;
struct nfsstats nfsstats;
SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem");
SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RW,
&nfsstats, nfsstats, "S,nfsstats");
static int nfs_ip_paranoia = 1;
SYSCTL_INT(_vfs_nfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW,
&nfs_ip_paranoia, 0, "");
#ifdef NFS_DEBUG
int nfs_debug;
SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
#endif
static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY;
SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_INITIAL_DELAY,
downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, "");
/* how long between console messages "nfs server foo not responding" */
static int nfs_tprintf_delay = NFS_TPRINTF_DELAY;
SYSCTL_INT(_vfs_nfs, NFS_TPRINTF_DELAY,
downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, "");
static void nfs_decode_args(struct mount *mp, struct nfsmount *nmp,
struct nfs_args *argp);
static int mountnfs(struct nfs_args *, struct mount *,
struct sockaddr *, char *, struct vnode **,
struct ucred *cred);
static vfs_mount_t nfs_mount;
static vfs_cmount_t nfs_cmount;
static vfs_unmount_t nfs_unmount;
static vfs_root_t nfs_root;
static vfs_statfs_t nfs_statfs;
static vfs_sync_t nfs_sync;
static vfs_sysctl_t nfs_sysctl;
/*
* nfs vfs operations.
*/
static struct vfsops nfs_vfsops = {
.vfs_init = nfs_init,
.vfs_mount = nfs_mount,
.vfs_cmount = nfs_cmount,
.vfs_root = nfs_root,
.vfs_statfs = nfs_statfs,
.vfs_sync = nfs_sync,
.vfs_uninit = nfs_uninit,
.vfs_unmount = nfs_unmount,
.vfs_sysctl = nfs_sysctl,
};
VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK);
/* So that loader and kldload(2) can find us, wherever we are.. */
MODULE_VERSION(nfs, 1);
static struct nfs_rpcops nfs_rpcops = {
nfs_readrpc,
nfs_writerpc,
nfs_writebp,
nfs_readlinkrpc,
nfs_invaldir,
nfs_commit,
};
/*
* This structure must be filled in by a primary bootstrap or bootstrap
* server for a diskless/dataless machine. It is initialized below just
* to ensure that it is allocated to initialized data (.data not .bss).
*/
struct nfs_diskless nfs_diskless = { { { 0 } } };
struct nfsv3_diskless nfsv3_diskless = { { { 0 } } };
int nfs_diskless_valid = 0;
SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
&nfs_diskless_valid, 0, "");
SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
nfsv3_diskless.root_hostnam, 0, "");
SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
&nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
"%Ssockaddr_in", "");
void nfsargs_ntoh(struct nfs_args *);
static int nfs_mountdiskless(char *,
struct sockaddr_in *, struct nfs_args *,
struct thread *, struct vnode **, struct mount *);
static void nfs_convert_diskless(void);
static void nfs_convert_oargs(struct nfs_args *args,
struct onfs_args *oargs);
int
nfs_iosize(struct nfsmount *nmp)
{
int iosize;
/*
* Calculate the size used for io buffers. Use the larger
* of the two sizes to minimise nfs requests but make sure
* that it is at least one VM page to avoid wasting buffer
* space.
*/
iosize = imax(nmp->nm_rsize, nmp->nm_wsize);
iosize = imax(iosize, PAGE_SIZE);
return (iosize);
}
static void
nfs_convert_oargs(struct nfs_args *args, struct onfs_args *oargs)
{
args->version = NFS_ARGSVERSION;
args->addr = oargs->addr;
args->addrlen = oargs->addrlen;
args->sotype = oargs->sotype;
args->proto = oargs->proto;
args->fh = oargs->fh;
args->fhsize = oargs->fhsize;
args->flags = oargs->flags;
args->wsize = oargs->wsize;
args->rsize = oargs->rsize;
args->readdirsize = oargs->readdirsize;
args->timeo = oargs->timeo;
args->retrans = oargs->retrans;
args->maxgrouplist = oargs->maxgrouplist;
args->readahead = oargs->readahead;
args->deadthresh = oargs->deadthresh;
args->hostname = oargs->hostname;
}
static void
nfs_convert_diskless(void)
{
bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
sizeof(struct ifaliasreq));
bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
sizeof(struct sockaddr_in));
nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
if (nfsv3_diskless.root_args.flags & NFSMNT_NFSV3) {
nfsv3_diskless.root_fhsize = NFSX_V3FH;
bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V3FH);
} else {
nfsv3_diskless.root_fhsize = NFSX_V2FH;
bcopy(nfs_diskless.root_fh, nfsv3_diskless.root_fh, NFSX_V2FH);
}
bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
sizeof(struct sockaddr_in));
bcopy(nfs_diskless.root_hostnam, nfsv3_diskless.root_hostnam, MNAMELEN);
nfsv3_diskless.root_time = nfs_diskless.root_time;
bcopy(nfs_diskless.my_hostnam, nfsv3_diskless.my_hostnam,
MAXHOSTNAMELEN);
nfs_diskless_valid = 3;
}
/*
* nfs statfs call
*/
static int
nfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
{
struct vnode *vp;
struct nfs_statfs *sfp;
caddr_t bpos, dpos;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
struct mbuf *mreq, *mrep, *md, *mb;
struct nfsnode *np;
u_quad_t tquad;
#ifndef nolint
sfp = NULL;
#endif
error = vfs_busy(mp, LK_NOWAIT, NULL, td);
if (error)
return (error);
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
if (error) {
vfs_unbusy(mp, td);
return (error);
}
vp = NFSTOV(np);
mtx_lock(&nmp->nm_mtx);
if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) {
mtx_unlock(&nmp->nm_mtx);
(void)nfs_fsinfo(nmp, vp, td->td_ucred, td);
} else
mtx_unlock(&nmp->nm_mtx);
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
mreq = nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_FSSTAT, td, td->td_ucred);
if (v3)
nfsm_postop_attr(vp, retattr);
if (error) {
if (mrep != NULL)
m_freem(mrep);
goto nfsmout;
}
sfp = nfsm_dissect(struct nfs_statfs *, NFSX_STATFS(v3));
mtx_lock(&nmp->nm_mtx);
sbp->f_iosize = nfs_iosize(nmp);
mtx_unlock(&nmp->nm_mtx);
if (v3) {
sbp->f_bsize = NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_tbytes);
sbp->f_blocks = tquad / NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_fbytes);
sbp->f_bfree = tquad / NFS_FABLKSIZE;
tquad = fxdr_hyper(&sfp->sf_abytes);
sbp->f_bavail = tquad / NFS_FABLKSIZE;
sbp->f_files = (fxdr_unsigned(int32_t,
sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
sbp->f_ffree = (fxdr_unsigned(int32_t,
sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
} else {
sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
sbp->f_files = 0;
sbp->f_ffree = 0;
}
m_freem(mrep);
nfsmout:
vput(vp);
vfs_unbusy(mp, td);
return (error);
}
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, struct ucred *cred,
struct thread *td)
{
struct nfsv3_fsinfo *fsp;
u_int32_t pref, max;
caddr_t bpos, dpos;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb;
u_int64_t maxfsize;
nfsstats.rpccnt[NFSPROC_FSINFO]++;
mreq = nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
mb = mreq;
bpos = mtod(mb, caddr_t);
nfsm_fhtom(vp, 1);
nfsm_request(vp, NFSPROC_FSINFO, td, cred);
nfsm_postop_attr(vp, retattr);
if (!error) {
fsp = nfsm_dissect(struct nfsv3_fsinfo *, NFSX_V3FSINFO);
pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
mtx_lock(&nmp->nm_mtx);
if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (max < nmp->nm_wsize && max > 0) {
nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = max;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (max < nmp->nm_rsize && max > 0) {
nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = max;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
~(NFS_DIRBLKSIZ - 1);
if (max < nmp->nm_readdirsize && max > 0) {
nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = max;
}
maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
nmp->nm_maxfilesize = maxfsize;
nmp->nm_mountp->mnt_stat.f_iosize = nfs_iosize(nmp);
nmp->nm_state |= NFSSTA_GOTFSINFO;
mtx_unlock(&nmp->nm_mtx);
}
m_freem(mrep);
nfsmout:
return (error);
}
/*
* Mount a remote root fs via. nfs. This depends on the info in the
* nfs_diskless structure that has been filled in properly by some primary
* bootstrap.
* It goes something like this:
* - do enough of "ifconfig" by calling ifioctl() so that the system
* can talk to the server
* - If nfs_diskless.mygateway is filled in, use that address as
* a default gateway.
* - build the rootfs mount point and call mountnfs() to do the rest.
*
* It is assumed to be safe to read, modify, and write the nfsv3_diskless
* structure, as well as other global NFS client variables here, as
* nfs_mountroot() will be called once in the boot before any other NFS
* client activity occurs.
*/
int
nfs_mountroot(struct mount *mp, struct thread *td)
{
struct nfsv3_diskless *nd = &nfsv3_diskless;
struct socket *so;
struct vnode *vp;
struct ifreq ir;
int error, i;
u_long l;
char buf[128];
char *cp;
#if defined(BOOTP_NFSROOT) && defined(BOOTP)
bootpc_init(); /* use bootp to get nfs_diskless filled in */
#elif defined(NFS_ROOT)
nfs_setup_diskless();
#endif
if (nfs_diskless_valid == 0)
return (-1);
if (nfs_diskless_valid == 1)
nfs_convert_diskless();
/*
* XXX splnet, so networks will receive...
*/
splnet();
/*
* Do enough of ifconfig(8) so that the critical net interface can
* talk to the server.
*/
error = socreate(nd->myif.ifra_addr.sa_family, &so, nd->root_args.sotype, 0,
td->td_ucred, td);
if (error)
panic("nfs_mountroot: socreate(%04x): %d",
nd->myif.ifra_addr.sa_family, error);
#if 0 /* XXX Bad idea */
/*
* We might not have been told the right interface, so we pass
* over the first ten interfaces of the same kind, until we get
* one of them configured.
*/
for (i = strlen(nd->myif.ifra_name) - 1;
nd->myif.ifra_name[i] >= '0' &&
nd->myif.ifra_name[i] <= '9';
nd->myif.ifra_name[i] ++) {
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
if(!error)
break;
}
#endif
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, td);
if (error)
panic("nfs_mountroot: SIOCAIFADDR: %d", error);
if ((cp = getenv("boot.netif.mtu")) != NULL) {
ir.ifr_mtu = strtol(cp, NULL, 10);
bcopy(nd->myif.ifra_name, ir.ifr_name, IFNAMSIZ);
freeenv(cp);
error = ifioctl(so, SIOCSIFMTU, (caddr_t)&ir, td);
if (error)
printf("nfs_mountroot: SIOCSIFMTU: %d", error);
}
soclose(so);
/*
* If the gateway field is filled in, set it as the default route.
* Note that pxeboot will set a default route of 0 if the route
* is not set by the DHCP server. Check also for a value of 0
* to avoid panicking inappropriately in that situation.
*/
if (nd->mygateway.sin_len != 0 &&
nd->mygateway.sin_addr.s_addr != 0) {
struct sockaddr_in mask, sin;
bzero((caddr_t)&mask, sizeof(mask));
sin = mask;
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
/* XXX MRT use table 0 for this sort of thing */
error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
(struct sockaddr *)&nd->mygateway,
(struct sockaddr *)&mask,
RTF_UP | RTF_GATEWAY, NULL);
if (error)
panic("nfs_mountroot: RTM_ADD: %d", error);
}
/*
* Create the rootfs mount point.
*/
nd->root_args.fh = nd->root_fh;
nd->root_args.fhsize = nd->root_fhsize;
l = ntohl(nd->root_saddr.sin_addr.s_addr);
snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
(l >> 24) & 0xff, (l >> 16) & 0xff,
(l >> 8) & 0xff, (l >> 0) & 0xff, nd->root_hostnam);
printf("NFS ROOT: %s\n", buf);
if ((error = nfs_mountdiskless(buf,
&nd->root_saddr, &nd->root_args, td, &vp, mp)) != 0) {
return (error);
}
/*
* This is not really an nfs issue, but it is much easier to
* set hostname here and then let the "/etc/rc.xxx" files
* mount the right /var based upon its preset value.
*/
bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
hostname[MAXHOSTNAMELEN - 1] = '\0';
for (i = 0; i < MAXHOSTNAMELEN; i++)
if (hostname[i] == '\0')
break;
inittodr(ntohl(nd->root_time));
return (0);
}
/*
* Internal version of mount system call for diskless setup.
*/
static int
nfs_mountdiskless(char *path,
struct sockaddr_in *sin, struct nfs_args *args, struct thread *td,
struct vnode **vpp, struct mount *mp)
{
struct sockaddr *nam;
int error;
nam = sodupsockaddr((struct sockaddr *)sin, M_WAITOK);
if ((error = mountnfs(args, mp, nam, path, vpp,
td->td_ucred)) != 0) {
printf("nfs_mountroot: mount %s on /: %d\n", path, error);
return (error);
}
return (0);
}
static void
nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp)
{
int s;
int adjsock;
int maxio;
s = splnet();
/*
* Set read-only flag if requested; otherwise, clear it if this is
* an update. If this is not an update, then either the read-only
* flag is already clear, or this is a root mount and it was set
* intentionally at some previous point.
*/
if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL) == 0) {
MNT_ILOCK(mp);
mp->mnt_flag |= MNT_RDONLY;
MNT_IUNLOCK(mp);
} else if (mp->mnt_flag & MNT_UPDATE) {
MNT_ILOCK(mp);
mp->mnt_flag &= ~MNT_RDONLY;
MNT_IUNLOCK(mp);
}
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context. Also, set up appropriate retransmit
* and soft timeout behavior.
*/
if (argp->sotype == SOCK_STREAM) {
nmp->nm_flag &= ~NFSMNT_NOCONN;
nmp->nm_flag |= NFSMNT_DUMBTIMR;
nmp->nm_timeo = NFS_MAXTIMEO;
nmp->nm_retry = NFS_RETRANS_TCP;
}
/* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
if ((argp->flags & NFSMNT_NFSV3) == 0)
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
(argp->flags & NFSMNT_NOCONN));
/* Update flags atomically. Don't change the lock bits. */
nmp->nm_flag = argp->flags | nmp->nm_flag;
splx(s);
if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
if (nmp->nm_timeo < NFS_MINTIMEO)
nmp->nm_timeo = NFS_MINTIMEO;
else if (nmp->nm_timeo > NFS_MAXTIMEO)
nmp->nm_timeo = NFS_MAXTIMEO;
}
if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
nmp->nm_retry = argp->retrans;
if (nmp->nm_retry > NFS_MAXREXMIT)
nmp->nm_retry = NFS_MAXREXMIT;
}
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
nmp->nm_wsize = argp->wsize;
/* Round down to multiple of blocksize */
nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize <= 0)
nmp->nm_wsize = NFS_FABLKSIZE;
}
if (nmp->nm_wsize > maxio)
nmp->nm_wsize = maxio;
if (nmp->nm_wsize > MAXBSIZE)
nmp->nm_wsize = MAXBSIZE;
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
nmp->nm_rsize = argp->rsize;
/* Round down to multiple of blocksize */
nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize <= 0)
nmp->nm_rsize = NFS_FABLKSIZE;
}
if (nmp->nm_rsize > maxio)
nmp->nm_rsize = maxio;
if (nmp->nm_rsize > MAXBSIZE)
nmp->nm_rsize = MAXBSIZE;
if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
nmp->nm_readdirsize = argp->readdirsize;
}
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if (nmp->nm_readdirsize > nmp->nm_rsize)
nmp->nm_readdirsize = nmp->nm_rsize;
if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
nmp->nm_acregmin = argp->acregmin;
else
nmp->nm_acregmin = NFS_MINATTRTIMO;
if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
nmp->nm_acregmax = argp->acregmax;
else
nmp->nm_acregmax = NFS_MAXATTRTIMO;
if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
nmp->nm_acdirmin = argp->acdirmin;
else
nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
nmp->nm_acdirmax = argp->acdirmax;
else
nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
if (nmp->nm_acdirmin > nmp->nm_acdirmax)
nmp->nm_acdirmin = nmp->nm_acdirmax;
if (nmp->nm_acregmin > nmp->nm_acregmax)
nmp->nm_acregmin = nmp->nm_acregmax;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0) {
if (argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
else
nmp->nm_numgrps = NFS_MAXGRPS;
}
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0) {
if (argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
else
nmp->nm_readahead = NFS_MAXRAHEAD;
}
if ((argp->flags & NFSMNT_WCOMMITSIZE) && argp->wcommitsize >= 0) {
if (argp->wcommitsize < nmp->nm_wsize)
nmp->nm_wcommitsize = nmp->nm_wsize;
else
nmp->nm_wcommitsize = argp->wcommitsize;
}
if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 0) {
if (argp->deadthresh <= NFS_MAXDEADTHRESH)
nmp->nm_deadthresh = argp->deadthresh;
else
nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
}
adjsock |= ((nmp->nm_sotype != argp->sotype) ||
(nmp->nm_soproto != argp->proto));
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (nmp->nm_so && adjsock) {
nfs_safedisconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp, NULL)) {
printf("nfs_args: retrying connect\n");
(void) tsleep((caddr_t)&lbolt, PSOCK, "nfscon", 0);
}
}
}
static const char *nfs_opts[] = { "from", "nfs_args",
"noatime", "noexec", "suiddir", "nosuid", "nosymfollow", "union",
"noclusterr", "noclusterw", "multilabel", "acls", "force", "update",
"async", "dumbtimer", "noconn", "nolockd", "intr", "rdirplus", "resvport",
"readdirsize", "soft", "hard", "mntudp", "tcp", "wsize", "rsize",
"retrans", "acregmin", "acregmax", "acdirmin", "acdirmax",
NULL };
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* bcopy() them in mountnfs(), but I wanted to detect errors before
* doing the sockargs() call because sockargs() allocates an mbuf and
* an error after that means that I have to release the mbuf.
*/
/* ARGSUSED */
static int
nfs_mount(struct mount *mp, struct thread *td)
{
struct nfs_args args = {
.version = NFS_ARGSVERSION,
.addr = NULL,
.addrlen = sizeof (struct sockaddr_in),
.sotype = SOCK_STREAM,
.proto = 0,
.fh = NULL,
.fhsize = 0,
.flags = NFSMNT_RESVPORT,
.wsize = NFS_WSIZE,
.rsize = NFS_RSIZE,
.readdirsize = NFS_READDIRSIZE,
.timeo = 10,
.retrans = NFS_RETRANS,
.maxgrouplist = NFS_MAXGRPS,
.readahead = NFS_DEFRAHEAD,
.wcommitsize = 0, /* was: NQ_DEFLEASE */
.deadthresh = NFS_MAXDEADTHRESH, /* was: NQ_DEADTHRESH */
.hostname = NULL,
/* args version 4 */
.acregmin = NFS_MINATTRTIMO,
.acregmax = NFS_MAXATTRTIMO,
.acdirmin = NFS_MINDIRATTRTIMO,
.acdirmax = NFS_MAXDIRATTRTIMO,
};
int error;
struct sockaddr *nam;
struct vnode *vp;
char hst[MNAMELEN];
size_t len;
u_char nfh[NFSX_V3FHMAX];
if (vfs_filteropt(mp->mnt_optnew, nfs_opts)) {
error = EINVAL;
goto out;
}
if ((mp->mnt_flag & (MNT_ROOTFS | MNT_UPDATE)) == MNT_ROOTFS) {
error = nfs_mountroot(mp, td);
goto out;
}
error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args);
if (error)
goto out;
if (args.version != NFS_ARGSVERSION) {
error = EPROGMISMATCH;
goto out;
}
if (mp->mnt_flag & MNT_UPDATE) {
struct nfsmount *nmp = VFSTONFS(mp);
if (nmp == NULL) {
error = EIO;
goto out;
}
/*
* When doing an update, we can't change from or to
* v3, switch lockd strategies or change cookie translation
*/
args.flags = (args.flags &
~(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/)) |
(nmp->nm_flag &
(NFSMNT_NFSV3 | NFSMNT_NOLOCKD /*|NFSMNT_XLATECOOKIE*/));
nfs_decode_args(mp, nmp, &args);
goto out;
}
/*
* Make the nfs_ip_paranoia sysctl serve as the default connection
* or no-connection mode for those protocols that support
* no-connection mode (the flag will be cleared later for protocols
* that do not support no-connection mode). This will allow a client
* to receive replies from a different IP then the request was
* sent to. Note: default value for nfs_ip_paranoia is 1 (paranoid),
* not 0.
*/
if (nfs_ip_paranoia == 0)
args.flags |= NFSMNT_NOCONN;
if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) {
error = EINVAL;
goto out;
}
error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
if (error)
goto out;
error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
if (error)
goto out;
bzero(&hst[len], MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
if (error)
goto out;
args.fh = nfh;
error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred);
out:
if (!error) {
MNT_ILOCK(mp);
mp->mnt_kern_flag |= (MNTK_MPSAFE|MNTK_LOOKUP_SHARED);
MNT_IUNLOCK(mp);
}
return (error);
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* bcopy() them in mountnfs(), but I wanted to detect errors before
* doing the sockargs() call because sockargs() allocates an mbuf and
* an error after that means that I have to release the mbuf.
*/
/* ARGSUSED */
static int
nfs_cmount(struct mntarg *ma, void *data, int flags, struct thread *td)
{
int error;
struct nfs_args args;
error = copyin(data, &args, sizeof (struct nfs_args));
if (error)
return error;
ma = mount_arg(ma, "nfs_args", &args, sizeof args);
error = kernel_mount(ma, flags);
return (error);
}
/*
* Common code for mount and mountroot
*/
static int
mountnfs(struct nfs_args *argp, struct mount *mp, struct sockaddr *nam,
char *hst, struct vnode **vpp, struct ucred *cred)
{
struct nfsmount *nmp;
struct nfsnode *np;
int error;
struct vattr attrs;
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONFS(mp);
printf("%s: MNT_UPDATE is no longer handled here\n", __func__);
FREE(nam, M_SONAME);
return (0);
} else {
nmp = uma_zalloc(nfsmount_zone, M_WAITOK);
bzero((caddr_t)nmp, sizeof (struct nfsmount));
TAILQ_INIT(&nmp->nm_bufq);
mp->mnt_data = nmp;
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
mtx_init(&nmp->nm_mtx, "NFSmount lock", NULL, MTX_DEF);
/*
* V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too
* high, depending on whether we end up with negative offsets in
* the client or server somewhere. 2GB-1 may be safer.
*
* For V3, nfs_fsinfo will adjust this as necessary. Assume maximum
* that we can handle until we find out otherwise.
* XXX Our "safe" limit on the client is what we can store in our
* buffer cache using signed(!) block numbers.
*/
if ((argp->flags & NFSMNT_NFSV3) == 0)
nmp->nm_maxfilesize = 0xffffffffLL;
else
nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
nmp->nm_timeo = NFS_TIMEO;
nmp->nm_retry = NFS_RETRANS;
if ((argp->flags & NFSMNT_NFSV3) && argp->sotype == SOCK_STREAM) {
nmp->nm_wsize = nmp->nm_rsize = NFS_MAXDATA;
} else {
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
}
nmp->nm_wcommitsize = hibufspace / (desiredvnodes / 1000);
nmp->nm_readdirsize = NFS_READDIRSIZE;
nmp->nm_numgrps = NFS_MAXGRPS;
nmp->nm_readahead = NFS_DEFRAHEAD;
nmp->nm_deadthresh = NFS_MAXDEADTHRESH;
nmp->nm_tprintf_delay = nfs_tprintf_delay;
if (nmp->nm_tprintf_delay < 0)
nmp->nm_tprintf_delay = 0;
nmp->nm_tprintf_initial_delay = nfs_tprintf_initial_delay;
if (nmp->nm_tprintf_initial_delay < 0)
nmp->nm_tprintf_initial_delay = 0;
nmp->nm_fhsize = argp->fhsize;
bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
nmp->nm_nam = nam;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
nmp->nm_rpcops = &nfs_rpcops;
nfs_decode_args(mp, nmp, argp);
/*
* For Connection based sockets (TCP,...) defer the connect until
* the first request, in case the server is not responding.
*/
if (nmp->nm_sotype == SOCK_DGRAM &&
(error = nfs_connect(nmp, NULL)))
goto bad;
/*
* This is silly, but it has to be set so that vinifod() works.
* We do not want to do an nfs_statfs() here since we can get
* stuck on a dead server and we are holding a lock on the mount
* point.
*/
mtx_lock(&nmp->nm_mtx);
mp->mnt_stat.f_iosize = nfs_iosize(nmp);
mtx_unlock(&nmp->nm_mtx);
/*
* A reference count is needed on the nfsnode representing the
* remote root. If this object is not persistent, then backward
* traversals of the mount point (i.e. "..") will not work if
* the nfsnode gets flushed out of the cache. Ufs does not have
* this problem, because one can identify root inodes by their
* number == ROOTINO (2).
*/
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE);
if (error)
goto bad;
*vpp = NFSTOV(np);
/*
* Get file attributes and transfer parameters for the
* mountpoint. This has the side effect of filling in
* (*vpp)->v_type with the correct value.
*/
if (argp->flags & NFSMNT_NFSV3)
nfs_fsinfo(nmp, *vpp, curthread->td_ucred, curthread);
else
VOP_GETATTR(*vpp, &attrs, curthread->td_ucred, curthread);
/*
* Lose the lock but keep the ref.
*/
VOP_UNLOCK(*vpp, 0);
return (0);
bad:
nfs_disconnect(nmp);
mtx_destroy(&nmp->nm_mtx);
uma_zfree(nfsmount_zone, nmp);
FREE(nam, M_SONAME);
return (error);
}
/*
* unmount system call
*/
static int
nfs_unmount(struct mount *mp, int mntflags, struct thread *td)
{
struct nfsmount *nmp;
int error, flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
nmp = VFSTONFS(mp);
/*
* Goes something like this..
* - Call vflush() to clear out vnodes for this filesystem
* - Close the socket
* - Free up the data structures
*/
/* In the forced case, cancel any outstanding requests. */
if (flags & FORCECLOSE) {
error = nfs_nmcancelreqs(nmp);
if (error)
goto out;
}
/* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */
error = vflush(mp, 1, flags, td);
if (error)
goto out;
/*
* We are now committed to the unmount.
*/
nfs_disconnect(nmp);
FREE(nmp->nm_nam, M_SONAME);
mtx_destroy(&nmp->nm_mtx);
uma_zfree(nfsmount_zone, nmp);
out:
return (error);
}
/*
* Return root of a filesystem
*/
static int
nfs_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td)
{
struct vnode *vp;
struct nfsmount *nmp;
struct nfsnode *np;
int error;
nmp = VFSTONFS(mp);
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, flags);
if (error)
return error;
vp = NFSTOV(np);
/*
* Get transfer parameters and attributes for root vnode once.
*/
mtx_lock(&nmp->nm_mtx);
if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 &&
(nmp->nm_flag & NFSMNT_NFSV3)) {
mtx_unlock(&nmp->nm_mtx);
nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread);
} else
mtx_unlock(&nmp->nm_mtx);
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_vflag |= VV_ROOT;
*vpp = vp;
return (0);
}
/*
* Flush out the buffer cache
*/
/* ARGSUSED */
static int
nfs_sync(struct mount *mp, int waitfor, struct thread *td)
{
struct vnode *vp, *mvp;
int error, allerror = 0;
/*
* Force stale buffer cache information to be flushed.
*/
MNT_ILOCK(mp);
loop:
MNT_VNODE_FOREACH(vp, mp, mvp) {
VI_LOCK(vp);
MNT_IUNLOCK(mp);
/* XXX Racy bv_cnt check. */
if (VOP_ISLOCKED(vp) || vp->v_bufobj.bo_dirty.bv_cnt == 0 ||
waitfor == MNT_LAZY) {
VI_UNLOCK(vp);
MNT_ILOCK(mp);
continue;
}
if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, td)) {
MNT_ILOCK(mp);
MNT_VNODE_FOREACH_ABORT_ILOCKED(mp, mvp);
goto loop;
}
error = VOP_FSYNC(vp, waitfor, td);
if (error)
allerror = error;
VOP_UNLOCK(vp, 0);
vrele(vp);
MNT_ILOCK(mp);
}
MNT_IUNLOCK(mp);
return (allerror);
}
static int
nfs_sysctl(struct mount *mp, fsctlop_t op, struct sysctl_req *req)
{
struct nfsmount *nmp = VFSTONFS(mp);
struct vfsquery vq;
int error;
bzero(&vq, sizeof(vq));
switch (op) {
#if 0
case VFS_CTL_NOLOCKS:
val = (nmp->nm_flag & NFSMNT_NOLOCKS) ? 1 : 0;
if (req->oldptr != NULL) {
error = SYSCTL_OUT(req, &val, sizeof(val));
if (error)
return (error);
}
if (req->newptr != NULL) {
error = SYSCTL_IN(req, &val, sizeof(val));
if (error)
return (error);
if (val)
nmp->nm_flag |= NFSMNT_NOLOCKS;
else
nmp->nm_flag &= ~NFSMNT_NOLOCKS;
}
break;
#endif
case VFS_CTL_QUERY:
mtx_lock(&nmp->nm_mtx);
if (nmp->nm_state & NFSSTA_TIMEO)
vq.vq_flags |= VQ_NOTRESP;
mtx_unlock(&nmp->nm_mtx);
#if 0
if (!(nmp->nm_flag & NFSMNT_NOLOCKS) &&
(nmp->nm_state & NFSSTA_LOCKTIMEO))
vq.vq_flags |= VQ_NOTRESPLOCK;
#endif
error = SYSCTL_OUT(req, &vq, sizeof(vq));
break;
case VFS_CTL_TIMEO:
if (req->oldptr != NULL) {
error = SYSCTL_OUT(req, &nmp->nm_tprintf_initial_delay,
sizeof(nmp->nm_tprintf_initial_delay));
if (error)
return (error);
}
if (req->newptr != NULL) {
error = vfs_suser(mp, req->td);
if (error)
return (error);
error = SYSCTL_IN(req, &nmp->nm_tprintf_initial_delay,
sizeof(nmp->nm_tprintf_initial_delay));
if (error)
return (error);
if (nmp->nm_tprintf_initial_delay < 0)
nmp->nm_tprintf_initial_delay = 0;
}
break;
default:
return (ENOTSUP);
}
return (0);
}
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