diff options
Diffstat (limited to 'sys/nfsclient/nfs_vfsops.c')
| -rw-r--r-- | sys/nfsclient/nfs_vfsops.c | 1579 |
1 files changed, 1579 insertions, 0 deletions
diff --git a/sys/nfsclient/nfs_vfsops.c b/sys/nfsclient/nfs_vfsops.c new file mode 100644 index 0000000..58384e8 --- /dev/null +++ b/sys/nfsclient/nfs_vfsops.c @@ -0,0 +1,1579 @@ +/*- + * 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/jail.h> +#include <sys/limits.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/syslog.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 <net/vnet.h> + +#include <netinet/in.h> + +#include <rpc/rpc.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 <nfs/nfsdiskless.h> + +FEATURE(nfsclient, "NFS client"); + +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, oldnfs, CTLFLAG_RW, 0, "Old NFS filesystem"); +SYSCTL_STRUCT(_vfs_oldnfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RW, + &nfsstats, nfsstats, "S,nfsstats"); +static int nfs_ip_paranoia = 1; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_ip_paranoia, CTLFLAG_RW, + &nfs_ip_paranoia, 0, + "Disallow accepting replies from IPs which differ from those sent"); +#ifdef NFS_DEBUG +int nfs_debug; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, + "Toggle debug flag"); +#endif +static int nfs_tprintf_initial_delay = NFS_TPRINTF_INITIAL_DELAY; +SYSCTL_INT(_vfs_oldnfs, NFS_TPRINTF_INITIAL_DELAY, + downdelayinitial, CTLFLAG_RW, &nfs_tprintf_initial_delay, 0, + "Delay before printing \"nfs server not responding\" messages"); +/* how long between console messages "nfs server foo not responding" */ +static int nfs_tprintf_delay = NFS_TPRINTF_DELAY; +SYSCTL_INT(_vfs_oldnfs, NFS_TPRINTF_DELAY, + downdelayinterval, CTLFLAG_RW, &nfs_tprintf_delay, 0, + "Delay between printing \"nfs server not responding\" messages"); + +static void nfs_decode_args(struct mount *mp, struct nfsmount *nmp, + struct nfs_args *argp, const char *hostname); +static int mountnfs(struct nfs_args *, struct mount *, + struct sockaddr *, char *, struct vnode **, + struct ucred *cred, int, int); +static void nfs_getnlminfo(struct vnode *, uint8_t *, size_t *, + struct sockaddr_storage *, int *, off_t *, + struct timeval *); +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; + +static int fake_wchan; + +/* + * 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, oldnfs, VFCF_NETWORK); + +/* So that loader and kldload(2) can find us, wherever we are.. */ +MODULE_VERSION(oldnfs, 1); +MODULE_DEPEND(oldnfs, krpc, 1, 1, 1); +#ifdef KGSSAPI +MODULE_DEPEND(oldnfs, kgssapi, 1, 1, 1); +#endif +MODULE_DEPEND(oldnfs, nfs_common, 1, 1, 1); +MODULE_DEPEND(oldnfs, nfslock, 1, 1, 1); + +static struct nfs_rpcops nfs_rpcops = { + nfs_readrpc, + nfs_writerpc, + nfs_writebp, + nfs_readlinkrpc, + nfs_invaldir, + nfs_commit, +}; + +/* + * This structure is now defined in sys/nfs/nfs_diskless.c so that it + * can be shared by both NFS clients. It is declared here so that it + * will be defined for kernels built without NFS_ROOT, although it + * isn't used in that case. + */ +#ifndef NFS_ROOT +struct nfs_diskless nfs_diskless = { { { 0 } } }; +struct nfsv3_diskless nfsv3_diskless = { { { 0 } } }; +int nfs_diskless_valid = 0; +#endif + +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, diskless_valid, CTLFLAG_RD, + &nfs_diskless_valid, 0, + "Has the diskless struct been filled correctly"); + +SYSCTL_STRING(_vfs_oldnfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD, + nfsv3_diskless.root_hostnam, 0, "Path to nfs root"); + +SYSCTL_OPAQUE(_vfs_oldnfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD, + &nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr, + "%Ssockaddr_in", "Diskless root nfs address"); + + +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 vnode *vp; + struct thread *td; + 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; + + td = curthread; +#ifndef nolint + sfp = NULL; +#endif + error = vfs_busy(mp, MBF_NOWAIT); + if (error) + return (error); + error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np, LK_EXCLUSIVE); + if (error) { + vfs_unbusy(mp); + 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); + 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 = curthread; + struct nfsv3_diskless *nd = &nfsv3_diskless; + struct socket *so; + struct vnode *vp; + struct ifreq ir; + int error; + 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 */ + CURVNET_SET(TD_TO_VNET(td)); + error = rtrequest(RTM_ADD, (struct sockaddr *)&sin, + (struct sockaddr *)&nd->mygateway, + (struct sockaddr *)&mask, + RTF_UP | RTF_GATEWAY, NULL); + CURVNET_RESTORE(); + 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); + nd->root_args.hostname = 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. + */ + mtx_lock(&prison0.pr_mtx); + strlcpy(prison0.pr_hostname, nd->my_hostnam, + sizeof (prison0.pr_hostname)); + mtx_unlock(&prison0.pr_mtx); + 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, + NFS_DEFAULT_NAMETIMEO, NFS_DEFAULT_NEGNAMETIMEO)) != 0) { + printf("nfs_mountroot: mount %s on /: %d\n", path, error); + return (error); + } + return (0); +} + +static int +nfs_sec_name_to_num(char *sec) +{ + if (!strcmp(sec, "krb5")) + return (RPCSEC_GSS_KRB5); + if (!strcmp(sec, "krb5i")) + return (RPCSEC_GSS_KRB5I); + if (!strcmp(sec, "krb5p")) + return (RPCSEC_GSS_KRB5P); + if (!strcmp(sec, "sys")) + return (AUTH_SYS); + /* + * Userland should validate the string but we will try and + * cope with unexpected values. + */ + return (AUTH_SYS); +} + +static void +nfs_decode_args(struct mount *mp, struct nfsmount *nmp, struct nfs_args *argp, + const char *hostname) +{ + int s; + int adjsock; + int maxio; + char *p; + char *secname; + char *principal; + + 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_client && adjsock) { + nfs_safedisconnect(nmp); + if (nmp->nm_sotype == SOCK_DGRAM) + while (nfs_connect(nmp)) { + printf("nfs_args: retrying connect\n"); + (void) tsleep(&fake_wchan, PSOCK, "nfscon", hz); + } + } + + if (hostname) { + strlcpy(nmp->nm_hostname, hostname, + sizeof(nmp->nm_hostname)); + p = strchr(nmp->nm_hostname, ':'); + if (p) + *p = '\0'; + } + + if (vfs_getopt(mp->mnt_optnew, "sec", + (void **) &secname, NULL) == 0) { + nmp->nm_secflavor = nfs_sec_name_to_num(secname); + } else { + nmp->nm_secflavor = AUTH_SYS; + } + + if (vfs_getopt(mp->mnt_optnew, "principal", + (void **) &principal, NULL) == 0) { + strlcpy(nmp->nm_principal, principal, + sizeof(nmp->nm_principal)); + } else { + snprintf(nmp->nm_principal, sizeof(nmp->nm_principal), + "nfs@%s", nmp->nm_hostname); + } +} + +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", + "readahead", "readdirsize", "soft", "hard", "mntudp", "tcp", "udp", + "wsize", "rsize", "retrans", "acregmin", "acregmax", "acdirmin", + "acdirmax", "deadthresh", "hostname", "timeout", "addr", "fh", "nfsv3", + "sec", "maxgroups", "principal", "negnametimeo", "nocto", "wcommitsize", + "nametimeo", + 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 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, ret, has_nfs_args_opt; + int has_addr_opt, has_fh_opt, has_hostname_opt; + struct sockaddr *nam; + struct vnode *vp; + char hst[MNAMELEN]; + size_t len; + u_char nfh[NFSX_V3FHMAX]; + char *opt; + int nametimeo = NFS_DEFAULT_NAMETIMEO; + int negnametimeo = NFS_DEFAULT_NEGNAMETIMEO; + + has_nfs_args_opt = 0; + has_addr_opt = 0; + has_fh_opt = 0; + has_hostname_opt = 0; + + 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); + goto out; + } + + /* + * The old mount_nfs program passed the struct nfs_args + * from userspace to kernel. The new mount_nfs program + * passes string options via nmount() from userspace to kernel + * and we populate the struct nfs_args in the kernel. + */ + if (vfs_getopt(mp->mnt_optnew, "nfs_args", NULL, NULL) == 0) { + error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, + sizeof args); + if (error) + goto out; + + if (args.version != NFS_ARGSVERSION) { + error = EPROGMISMATCH; + goto out; + } + has_nfs_args_opt = 1; + } + + if (vfs_getopt(mp->mnt_optnew, "dumbtimer", NULL, NULL) == 0) + args.flags |= NFSMNT_DUMBTIMR; + if (vfs_getopt(mp->mnt_optnew, "noconn", NULL, NULL) == 0) + args.flags |= NFSMNT_NOCONN; + if (vfs_getopt(mp->mnt_optnew, "conn", NULL, NULL) == 0) + args.flags |= NFSMNT_NOCONN; + if (vfs_getopt(mp->mnt_optnew, "nolockd", NULL, NULL) == 0) + args.flags |= NFSMNT_NOLOCKD; + if (vfs_getopt(mp->mnt_optnew, "lockd", NULL, NULL) == 0) + args.flags &= ~NFSMNT_NOLOCKD; + if (vfs_getopt(mp->mnt_optnew, "intr", NULL, NULL) == 0) + args.flags |= NFSMNT_INT; + if (vfs_getopt(mp->mnt_optnew, "rdirplus", NULL, NULL) == 0) + args.flags |= NFSMNT_RDIRPLUS; + if (vfs_getopt(mp->mnt_optnew, "resvport", NULL, NULL) == 0) + args.flags |= NFSMNT_RESVPORT; + if (vfs_getopt(mp->mnt_optnew, "noresvport", NULL, NULL) == 0) + args.flags &= ~NFSMNT_RESVPORT; + if (vfs_getopt(mp->mnt_optnew, "soft", NULL, NULL) == 0) + args.flags |= NFSMNT_SOFT; + if (vfs_getopt(mp->mnt_optnew, "hard", NULL, NULL) == 0) + args.flags &= ~NFSMNT_SOFT; + if (vfs_getopt(mp->mnt_optnew, "mntudp", NULL, NULL) == 0) + args.sotype = SOCK_DGRAM; + if (vfs_getopt(mp->mnt_optnew, "udp", NULL, NULL) == 0) + args.sotype = SOCK_DGRAM; + if (vfs_getopt(mp->mnt_optnew, "tcp", NULL, NULL) == 0) + args.sotype = SOCK_STREAM; + if (vfs_getopt(mp->mnt_optnew, "nfsv3", NULL, NULL) == 0) + args.flags |= NFSMNT_NFSV3; + if (vfs_getopt(mp->mnt_optnew, "nocto", NULL, NULL) == 0) + args.flags |= NFSMNT_NOCTO; + if (vfs_getopt(mp->mnt_optnew, "readdirsize", (void **)&opt, NULL) == 0) { + if (opt == NULL) { + vfs_mount_error(mp, "illegal readdirsize"); + error = EINVAL; + goto out; + } + ret = sscanf(opt, "%d", &args.readdirsize); + if (ret != 1 || args.readdirsize <= 0) { + vfs_mount_error(mp, "illegal readdirsize: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_READDIRSIZE; + } + if (vfs_getopt(mp->mnt_optnew, "readahead", (void **)&opt, NULL) == 0) { + if (opt == NULL) { + vfs_mount_error(mp, "illegal readahead"); + error = EINVAL; + goto out; + } + ret = sscanf(opt, "%d", &args.readahead); + if (ret != 1 || args.readahead <= 0) { + vfs_mount_error(mp, "illegal readahead: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_READAHEAD; + } + if (vfs_getopt(mp->mnt_optnew, "wsize", (void **)&opt, NULL) == 0) { + if (opt == NULL) { + vfs_mount_error(mp, "illegal wsize"); + error = EINVAL; + goto out; + } + ret = sscanf(opt, "%d", &args.wsize); + if (ret != 1 || args.wsize <= 0) { + vfs_mount_error(mp, "illegal wsize: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_WSIZE; + } + if (vfs_getopt(mp->mnt_optnew, "rsize", (void **)&opt, NULL) == 0) { + if (opt == NULL) { + vfs_mount_error(mp, "illegal rsize"); + error = EINVAL; + goto out; + } + ret = sscanf(opt, "%d", &args.rsize); + if (ret != 1 || args.rsize <= 0) { + vfs_mount_error(mp, "illegal wsize: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_RSIZE; + } + if (vfs_getopt(mp->mnt_optnew, "retrans", (void **)&opt, NULL) == 0) { + if (opt == NULL) { + vfs_mount_error(mp, "illegal retrans"); + error = EINVAL; + goto out; + } + ret = sscanf(opt, "%d", &args.retrans); + if (ret != 1 || args.retrans <= 0) { + vfs_mount_error(mp, "illegal retrans: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_RETRANS; + } + if (vfs_getopt(mp->mnt_optnew, "acregmin", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.acregmin); + if (ret != 1 || args.acregmin < 0) { + vfs_mount_error(mp, "illegal acregmin: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_ACREGMIN; + } + if (vfs_getopt(mp->mnt_optnew, "acregmax", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.acregmax); + if (ret != 1 || args.acregmax < 0) { + vfs_mount_error(mp, "illegal acregmax: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_ACREGMAX; + } + if (vfs_getopt(mp->mnt_optnew, "acdirmin", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.acdirmin); + if (ret != 1 || args.acdirmin < 0) { + vfs_mount_error(mp, "illegal acdirmin: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_ACDIRMIN; + } + if (vfs_getopt(mp->mnt_optnew, "acdirmax", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.acdirmax); + if (ret != 1 || args.acdirmax < 0) { + vfs_mount_error(mp, "illegal acdirmax: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_ACDIRMAX; + } + if (vfs_getopt(mp->mnt_optnew, "wcommitsize", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.wcommitsize); + if (ret != 1 || args.wcommitsize < 0) { + vfs_mount_error(mp, "illegal wcommitsize: %s", opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_WCOMMITSIZE; + } + if (vfs_getopt(mp->mnt_optnew, "deadthresh", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.deadthresh); + if (ret != 1 || args.deadthresh <= 0) { + vfs_mount_error(mp, "illegal deadthresh: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_DEADTHRESH; + } + if (vfs_getopt(mp->mnt_optnew, "timeout", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.timeo); + if (ret != 1 || args.timeo <= 0) { + vfs_mount_error(mp, "illegal timeout: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_TIMEO; + } + if (vfs_getopt(mp->mnt_optnew, "maxgroups", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &args.maxgrouplist); + if (ret != 1 || args.maxgrouplist <= 0) { + vfs_mount_error(mp, "illegal maxgroups: %s", + opt); + error = EINVAL; + goto out; + } + args.flags |= NFSMNT_MAXGRPS; + } + if (vfs_getopt(mp->mnt_optnew, "nametimeo", (void **)&opt, NULL) == 0) { + ret = sscanf(opt, "%d", &nametimeo); + if (ret != 1 || nametimeo < 0) { + vfs_mount_error(mp, "illegal nametimeo: %s", opt); + error = EINVAL; + goto out; + } + } + if (vfs_getopt(mp->mnt_optnew, "negnametimeo", (void **)&opt, NULL) + == 0) { + ret = sscanf(opt, "%d", &negnametimeo); + if (ret != 1 || negnametimeo < 0) { + vfs_mount_error(mp, "illegal negnametimeo: %s", + opt); + error = EINVAL; + goto out; + } + } + if (vfs_getopt(mp->mnt_optnew, "addr", (void **)&args.addr, + &args.addrlen) == 0) { + has_addr_opt = 1; + if (args.addrlen > SOCK_MAXADDRLEN) { + error = ENAMETOOLONG; + goto out; + } + nam = malloc(args.addrlen, M_SONAME, + M_WAITOK); + bcopy(args.addr, nam, args.addrlen); + nam->sa_len = args.addrlen; + } + if (vfs_getopt(mp->mnt_optnew, "fh", (void **)&args.fh, + &args.fhsize) == 0) { + has_fh_opt = 1; + } + if (vfs_getopt(mp->mnt_optnew, "hostname", (void **)&args.hostname, + NULL) == 0) { + has_hostname_opt = 1; + } + if (args.hostname == NULL) { + vfs_mount_error(mp, "Invalid hostname"); + error = EINVAL; + goto out; + } + if (args.fhsize < 0 || args.fhsize > NFSX_V3FHMAX) { + vfs_mount_error(mp, "Bad file handle"); + error = EINVAL; + goto out; + } + + if (mp->mnt_flag & MNT_UPDATE) { + struct nfsmount *nmp = VFSTONFS(mp); + + if (nmp == NULL) { + error = EIO; + goto out; + } + + /* + * If a change from TCP->UDP is done and there are thread(s) + * that have I/O RPC(s) in progress with a tranfer size + * greater than NFS_MAXDGRAMDATA, those thread(s) will be + * hung, retrying the RPC(s) forever. Usually these threads + * will be seen doing an uninterruptible sleep on wait channel + * "newnfsreq" (truncated to "newnfsre" by procstat). + */ + if (args.sotype == SOCK_DGRAM && nmp->nm_sotype == SOCK_STREAM) + tprintf(curthread->td_proc, LOG_WARNING, + "Warning: mount -u that changes TCP->UDP can result in hung threads\n"); + + /* + * 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, NULL); + 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 (has_nfs_args_opt) { + /* + * In the 'nfs_args' case, the pointers in the args + * structure are in userland - we copy them in here. + */ + if (!has_fh_opt) { + error = copyin((caddr_t)args.fh, (caddr_t)nfh, + args.fhsize); + if (error) { + goto out; + } + args.fh = nfh; + } + if (!has_hostname_opt) { + error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); + if (error) { + goto out; + } + bzero(&hst[len], MNAMELEN - len); + args.hostname = hst; + } + if (!has_addr_opt) { + /* sockargs() call must be after above copyin() calls */ + error = getsockaddr(&nam, (caddr_t)args.addr, + args.addrlen); + if (error) { + goto out; + } + } + } else if (has_addr_opt == 0) { + vfs_mount_error(mp, "No server address"); + error = EINVAL; + goto out; + } + error = mountnfs(&args, mp, nam, args.hostname, &vp, + curthread->td_ucred, nametimeo, negnametimeo); +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, uint64_t flags) +{ + 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, int nametimeo, + int negnametimeo) +{ + 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; + nmp->nm_getinfo = nfs_getnlminfo; + nmp->nm_vinvalbuf = nfs_vinvalbuf; + } + 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. + */ + if ((argp->flags & NFSMNT_NFSV3) == 0) + nmp->nm_maxfilesize = 0xffffffffLL; + else + nmp->nm_maxfilesize = OFF_MAX; + + 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_nametimeo = nametimeo; + nmp->nm_negnametimeo = negnametimeo; + 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, hst); + + /* + * 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))) + 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); + + /* + * 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 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, curthread); + 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 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 vnode *vp, *mvp; + struct thread *td; + int error, allerror = 0; + + td = curthread; + + MNT_ILOCK(mp); + /* + * If a forced dismount is in progress, return from here so that + * the umount(2) syscall doesn't get stuck in VFS_SYNC() before + * calling VFS_UNMOUNT(). + */ + if ((mp->mnt_kern_flag & MNTK_UNMOUNTF) != 0) { + MNT_IUNLOCK(mp); + return (EBADF); + } + + /* + * Force stale buffer cache information to be flushed. + */ +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); +} + +/* + * Extract the information needed by the nlm from the nfs vnode. + */ +static void +nfs_getnlminfo(struct vnode *vp, uint8_t *fhp, size_t *fhlenp, + struct sockaddr_storage *sp, int *is_v3p, off_t *sizep, + struct timeval *timeop) +{ + struct nfsmount *nmp; + struct nfsnode *np = VTONFS(vp); + + nmp = VFSTONFS(vp->v_mount); + if (fhlenp != NULL) + *fhlenp = (size_t)np->n_fhsize; + if (fhp != NULL) + bcopy(np->n_fhp, fhp, np->n_fhsize); + if (sp != NULL) + bcopy(nmp->nm_nam, sp, min(nmp->nm_nam->sa_len, sizeof(*sp))); + if (is_v3p != NULL) + *is_v3p = NFS_ISV3(vp); + if (sizep != NULL) + *sizep = np->n_size; + if (timeop != NULL) { + timeop->tv_sec = nmp->nm_timeo / NFS_HZ; + timeop->tv_usec = (nmp->nm_timeo % NFS_HZ) * (1000000 / NFS_HZ); + } +} + |
