/*- * 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 __FBSDID("$FreeBSD$"); #include "opt_bootp.h" #include "opt_nfsroot.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header"); MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle"); MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data"); MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables"); MALLOC_DEFINE(M_NFSDIRECTIO, "NFS 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_RD, &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 int nfs_iosize(struct nfsmount *nmp); 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 *, int, 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); static 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 = max(nmp->nm_rsize, nmp->nm_wsize); if (iosize < PAGE_SIZE) 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); 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 = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np); if (error) return (error); vp = NFSTOV(np); if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0) (void)nfs_fsinfo(nmp, vp, td->td_ucred, td); 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)); sbp->f_flags = nmp->nm_flag; sbp->f_iosize = nfs_iosize(nmp); 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); 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); 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; } 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; int error, i; u_long l; char buf[128]; NET_ASSERT_GIANT(); #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, SOCK_DGRAM, 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); 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); 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, MNT_RDONLY, &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, int mountflag, struct sockaddr_in *sin, struct nfs_args *args, struct thread *td, struct vnode **vpp, struct mount *mp) { struct sockaddr *nam; int error; mp->mnt_kern_flag = 0; mp->mnt_flag = mountflag; 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(); if (vfs_getopt(mp->mnt_optnew, "ro", NULL, NULL)) mp->mnt_flag &= ~MNT_RDONLY; else mp->mnt_flag |= MNT_RDONLY; /* * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes * no sense in that context. */ if (argp->sotype == SOCK_STREAM) nmp->nm_flag &= ~NFSMNT_NOCONN; /* 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_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", 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) { int error; struct nfs_args args; 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)) return (EINVAL); if (mp->mnt_flag & MNT_ROOTFS) return (nfs_mountroot(mp, td)); error = vfs_copyopt(mp->mnt_optnew, "nfs_args", &args, sizeof args); if (error) return (error); if (args.version != NFS_ARGSVERSION) { return (EPROGMISMATCH); } if (mp->mnt_flag & MNT_UPDATE) { struct nfsmount *nmp = VFSTONFS(mp); if (nmp == NULL) return (EIO); /* * 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); return (0); } /* * 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) return (EINVAL); error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize); if (error) return (error); error = copyinstr(args.hostname, hst, MNAMELEN-1, &len); if (error) return (error); bzero(&hst[len], MNAMELEN - len); /* sockargs() call must be after above copyin() calls */ error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen); if (error) return (error); args.fh = nfh; error = mountnfs(&args, mp, nam, hst, &vp, td->td_ucred); 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); /* update paths, file handles, etc, here XXX */ 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 = (qaddr_t)nmp; } vfs_getnewfsid(mp); nmp->nm_mountp = mp; /* * 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_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); if (nmp->nm_sotype == SOCK_STREAM) mtx_init(&nmp->nm_nfstcpstate.mtx, "NFS/TCP state lock", NULL, MTX_DEF); /* * 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. */ mp->mnt_stat.f_iosize = nfs_iosize(nmp); /* * 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); 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, curthread); return (0); bad: if (nmp->nm_sotype == SOCK_STREAM) mtx_destroy(&nmp->nm_nfstcpstate.mtx); nfs_disconnect(nmp); 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) return (error); } /* We hold 1 extra ref on the root vnode; see comment in mountnfs(). */ error = vflush(mp, 1, flags, td); if (error) return (error); /* * We are now committed to the unmount. */ nfs_disconnect(nmp); FREE(nmp->nm_nam, M_SONAME); if (nmp->nm_sotype == SOCK_STREAM) mtx_destroy(&nmp->nm_nfstcpstate.mtx); uma_zfree(nfsmount_zone, nmp); return (0); } /* * 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); if (error) return (error); vp = NFSTOV(np); /* * Get transfer parameters and attributes for root vnode once. */ if ((nmp->nm_state & NFSSTA_GOTFSINFO) == 0 && (nmp->nm_flag & NFSMNT_NFSV3)) { nfs_fsinfo(nmp, vp, curthread->td_ucred, curthread); } 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, *nvp; int error, allerror = 0; /* * Force stale buffer cache information to be flushed. */ MNT_ILOCK(mp); loop: MNT_VNODE_FOREACH(vp, mp, nvp) { VI_LOCK(vp); MNT_IUNLOCK(mp); if (VOP_ISLOCKED(vp, NULL) || 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); goto loop; } error = VOP_FSYNC(vp, waitfor, td); if (error) allerror = error; VOP_UNLOCK(vp, 0, td); 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: if (nmp->nm_state & NFSSTA_TIMEO) vq.vq_flags |= VQ_NOTRESP; #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); }