 @@ -1,1161 +1,1160 @@
-/*	$NetBSD: nfs_vfsops.c,v 1.241 2020/04/13 19:23:20 ad Exp $	*/
+/*	$NetBSD: nfs_vfsops.c,v 1.242 2021/04/02 03:07:54 christos Exp $	*/
 /*
  * 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.
  * 3. 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>
-__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.241 2020/04/13 19:23:20 ad Exp $");
+__KERNEL_RCSID(0, "$NetBSD: nfs_vfsops.c,v 1.242 2021/04/02 03:07:54 christos Exp $");
 #if defined(_KERNEL_OPT)
 #include "opt_nfs.h"
 #endif
 #include <sys/param.h>
 #include <sys/ioctl.h>
 #include <sys/signal.h>
 #include <sys/proc.h>
 #include <sys/namei.h>
 #include <sys/device.h>
 #include <sys/vnode.h>
 #include <sys/kernel.h>
 #include <sys/mount.h>
 #include <sys/buf.h>
 #include <sys/mbuf.h>
 #include <sys/dirent.h>
 #include <sys/socket.h>
 #include <sys/socketvar.h>
 #include <sys/sysctl.h>
 #include <sys/systm.h>
 #include <sys/timetc.h>
 #include <sys/kauth.h>
 #include <sys/module.h>
 #include <net/if.h>
 #include <net/route.h>
 #include <netinet/in.h>
 #include <nfs/rpcv2.h>
 #include <nfs/nfsproto.h>
 #include <nfs/nfsnode.h>
 #include <nfs/nfs.h>
 #include <nfs/nfsmount.h>
 #include <nfs/xdr_subs.h>
 #include <nfs/nfsm_subs.h>
 #include <nfs/nfsdiskless.h>
 #include <nfs/nfs_var.h>
 MODULE(MODULE_CLASS_VFS, nfs, NULL);
 extern struct nfsstats nfsstats;
 extern int nfs_ticks;
 /*
  * keep a count of the nfs mounts to generate ficticious drive names
  * for the per drive stats.
  */
 unsigned int nfs_mount_count = 0;
 int nfs_commitsize;
 /*
  * nfs vfs operations.
  */
 extern const struct vnodeopv_desc nfsv2_vnodeop_opv_desc;
 extern const struct vnodeopv_desc spec_nfsv2nodeop_opv_desc;
 extern const struct vnodeopv_desc fifo_nfsv2nodeop_opv_desc;
 const struct vnodeopv_desc * const nfs_vnodeopv_descs[] = {
 	&nfsv2_vnodeop_opv_desc,
 	&spec_nfsv2nodeop_opv_desc,
 	&fifo_nfsv2nodeop_opv_desc,
 	NULL,
 };
 struct vfsops nfs_vfsops = {
 	.vfs_name = MOUNT_NFS,
 	.vfs_min_mount_data = sizeof (struct nfs_args),
 	.vfs_mount = nfs_mount,
 	.vfs_start = nfs_start,
 	.vfs_unmount = nfs_unmount,
 	.vfs_root = nfs_root,
 	.vfs_quotactl = (void *)eopnotsupp,
 	.vfs_statvfs = nfs_statvfs,
 	.vfs_sync = nfs_sync,
 	.vfs_loadvnode = nfs_loadvnode,
 	.vfs_vget = nfs_vget,
 	.vfs_fhtovp = nfs_fhtovp,
 	.vfs_vptofh = nfs_vptofh,
 	.vfs_init = nfs_vfs_init,
 	.vfs_done = nfs_vfs_done,
 	.vfs_mountroot = nfs_mountroot,
 	.vfs_snapshot = (void *)eopnotsupp,
 	.vfs_extattrctl = vfs_stdextattrctl,
 	.vfs_suspendctl = genfs_suspendctl,
 	.vfs_renamelock_enter = genfs_renamelock_enter,
 	.vfs_renamelock_exit = genfs_renamelock_exit,
 	.vfs_fsync = (void *)eopnotsupp,
 	.vfs_opv_descs = nfs_vnodeopv_descs
 };
 extern u_int32_t nfs_procids[NFS_NPROCS];
 extern u_int32_t nfs_prog, nfs_vers;
 static int nfs_mount_diskless(struct nfs_dlmount *, const char *,
     struct mount **, struct vnode **, struct lwp *);
 static int
 nfs_modcmd(modcmd_t cmd, void *arg)
+{
 	int error;
 	switch (cmd) {
 	case MODULE_CMD_INIT:
 		error = vfs_attach(&nfs_vfsops);
 		return error;
 	case MODULE_CMD_FINI:
 		error = vfs_detach(&nfs_vfsops);
 		return error;
 	default:
 		return ENOTTY;
+	}
+}
 /*
  * nfs statvfs call
  */
 int
 nfs_statvfs(struct mount *mp, struct statvfs *sbp)
+{
 	struct lwp *l = curlwp;
 	struct vnode *vp;
 	struct nfs_statfs *sfp;
 	char *cp;
 	u_int32_t *tl;
 	int32_t t1, t2;
 	char *bpos, *dpos, *cp2;
 	struct nfsmount *nmp = VFSTONFS(mp);
 	int error = 0, retattr;
 #ifdef NFS_V2_ONLY
 	const int v3 = 0;
 #else
 	int v3 = (nmp->nm_flag & NFSMNT_NFSV3);
 #endif
 	struct mbuf *mreq, *mrep = NULL, *md, *mb;
 	kauth_cred_t cred;
 	u_quad_t tquad;
 	struct nfsnode *np;
 #ifndef nolint
 	sfp = (struct nfs_statfs *)0;
 #endif
 	vp = nmp->nm_vnode;
 	np = VTONFS(vp);
 	cred = kauth_cred_alloc();
 #ifndef NFS_V2_ONLY
 	if (v3 && (nmp->nm_iflag & NFSMNT_GOTFSINFO) == 0)
 		(void)nfs_fsinfo(nmp, vp, cred, l);
 #endif
 	nfsstats.rpccnt[NFSPROC_FSSTAT]++;
 	nfsm_reqhead(np, NFSPROC_FSSTAT, NFSX_FH(v3));
 	nfsm_fhtom(np, v3);
 	nfsm_request(np, NFSPROC_FSSTAT, l, cred);
 	if (v3)
 		nfsm_postop_attr(vp, retattr, 0);
 	if (error) {
 		if (mrep != NULL) {
 			if (mrep->m_next != NULL)
 				printf("nfs_vfsops: nfs_statvfs would lose buffers\n");
 			m_freem(mrep);
+		}
 		goto nfsmout;
+	}
 	nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
 	sbp->f_flag = nmp->nm_flag;
 	sbp->f_iosize = uimin(nmp->nm_rsize, nmp->nm_wsize);
 	if (v3) {
 		sbp->f_frsize = sbp->f_bsize = NFS_FABLKSIZE;
 		tquad = fxdr_hyper(&sfp->sf_tbytes);
 		sbp->f_blocks = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
 		tquad = fxdr_hyper(&sfp->sf_fbytes);
 		sbp->f_bfree = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
 		tquad = fxdr_hyper(&sfp->sf_abytes);
 		tquad = ((quad_t)tquad / (quad_t)NFS_FABLKSIZE);
 		sbp->f_bresvd = sbp->f_bfree - tquad;
 		sbp->f_bavail = tquad;
 		/* Handle older NFS servers returning negative values */
 		if ((quad_t)sbp->f_bavail < 0)
 			sbp->f_bavail = 0;
 		tquad = fxdr_hyper(&sfp->sf_tfiles);
 		sbp->f_files = tquad;
 		tquad = fxdr_hyper(&sfp->sf_ffiles);
 		sbp->f_ffree = tquad;
 		sbp->f_favail = tquad;
 		sbp->f_fresvd = 0;
 		sbp->f_namemax = NFS_MAXNAMLEN;
 	} else {
 		sbp->f_bsize = NFS_FABLKSIZE;
 		sbp->f_frsize = 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_fresvd = 0;
 		sbp->f_files = 0;
 		sbp->f_ffree = 0;
 		sbp->f_favail = 0;
 		sbp->f_fresvd = 0;
 		sbp->f_namemax = NFS_MAXNAMLEN;
+	}
 	copy_statvfs_info(sbp, mp);
 	nfsm_reqdone;
 	kauth_cred_free(cred);
 	return (error);
+}
 #ifndef NFS_V2_ONLY
 /*
  * nfs version 3 fsinfo rpc call
  */
 int
 nfs_fsinfo(struct nfsmount *nmp, struct vnode *vp, kauth_cred_t cred, struct lwp *l)
+{
 	struct nfsv3_fsinfo *fsp;
 	char *cp;
 	int32_t t1, t2;
 	u_int32_t *tl, pref, xmax;
 	char *bpos, *dpos, *cp2;
 	int error = 0, retattr;
 	struct mbuf *mreq, *mrep, *md, *mb;
 	u_int64_t maxfsize;
 	struct nfsnode *np = VTONFS(vp);
 	nfsstats.rpccnt[NFSPROC_FSINFO]++;
 	nfsm_reqhead(np, NFSPROC_FSINFO, NFSX_FH(1));
 	nfsm_fhtom(np, 1);
 	nfsm_request(np, NFSPROC_FSINFO, l, cred);
 	nfsm_postop_attr(vp, retattr, 0);
 	if (!error) {
 		nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
 		pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
 		if ((nmp->nm_flag & NFSMNT_WSIZE) == 0 &&
 		    pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
 			nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
 				~(NFS_FABLKSIZE - 1);
 		xmax = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
 		if (xmax < nmp->nm_wsize && xmax > 0) {
 			nmp->nm_wsize = xmax & ~(NFS_FABLKSIZE - 1);
 			if (nmp->nm_wsize == 0)
 				nmp->nm_wsize = xmax;
+		}
 		pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
 		if ((nmp->nm_flag & NFSMNT_RSIZE) == 0 &&
 		    pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
 			nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
 				~(NFS_FABLKSIZE - 1);
 		xmax = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
 		if (xmax < nmp->nm_rsize && xmax > 0) {
 			nmp->nm_rsize = xmax & ~(NFS_FABLKSIZE - 1);
 			if (nmp->nm_rsize == 0)
 				nmp->nm_rsize = xmax;
+		}
 		pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
 		if (pref < nmp->nm_readdirsize && pref >= NFS_DIRFRAGSIZ)
 			nmp->nm_readdirsize = (pref + NFS_DIRFRAGSIZ - 1) &
 				~(NFS_DIRFRAGSIZ - 1);
 		if (xmax < nmp->nm_readdirsize && xmax > 0) {
 			nmp->nm_readdirsize = xmax & ~(NFS_DIRFRAGSIZ - 1);
 			if (nmp->nm_readdirsize == 0)
 				nmp->nm_readdirsize = xmax;
+		}
 		/* XXX */
 		nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
 		maxfsize = fxdr_hyper(&fsp->fs_maxfilesize);
 		if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
 			nmp->nm_maxfilesize = maxfsize;
 		nmp->nm_mountp->mnt_fs_bshift =
 		    ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
 		nmp->nm_iflag |= NFSMNT_GOTFSINFO;
+	}
 	nfsm_reqdone;
 	return (error);
+}
 #endif
 /*
  * Mount a remote root fs via. NFS.  It goes like this:
  * - Call nfs_boot_init() to fill in the nfs_diskless struct
  * - build the rootfs mount point and call mountnfs() to do the rest.
  */
 int
 nfs_mountroot(void)
+{
 	struct timespec ts;
 	struct nfs_diskless *nd;
 	struct vattr attr;
 	struct mount *mp;
 	struct vnode *vp;
 	struct lwp *l;
 	long n;
 	int error;
 	l = curlwp; /* XXX */
 	if (device_class(root_device) != DV_IFNET)
 		return (ENODEV);
 	/*
 	 * XXX time must be non-zero when we init the interface or else
 	 * the arp code will wedge.  [Fixed now in if_ether.c]
 	 * However, the NFS attribute cache gives false "hits" when the
 	 * current time < nfs_attrtimeo(nmp, np) so keep this in for now.
 	 */
 	if (time_second < NFS_MAXATTRTIMO) {
 		ts.tv_sec = NFS_MAXATTRTIMO;
 		ts.tv_nsec = 0;
 		tc_setclock(&ts);
+	}
 	/*
 	 * Call nfs_boot_init() to fill in the nfs_diskless struct.
 	 * Side effect:  Finds and configures a network interface.
 	 */
 	nd = kmem_zalloc(sizeof(*nd), KM_SLEEP);
 	error = nfs_boot_init(nd, l);
 	if (error) {
 		kmem_free(nd, sizeof(*nd));
 		return (error);
+	}
 	/*
 	 * Create the root mount point.
 	 */
 	error = nfs_mount_diskless(&nd->nd_root, "/", &mp, &vp, l);
 	if (error)
 		goto out;
 	printf("root on %s\n", nd->nd_root.ndm_host);
 	/*
 	 * Link it into the mount list.
 	 */
 	mountlist_append(mp);
 	rootvp = vp;
 	mp->mnt_vnodecovered = NULLVP;
 	vfs_unbusy(mp);
 	/* Get root attributes (for the time). */
 	vn_lock(vp, LK_SHARED | LK_RETRY);
 	error = VOP_GETATTR(vp, &attr, l->l_cred);
 	VOP_UNLOCK(vp);
 	if (error)
 		panic("nfs_mountroot: getattr for root");
 	n = attr.va_atime.tv_sec;
 #ifdef	DEBUG
 	printf("root time: 0x%lx\n", n);
 #endif
 	setrootfstime(n);
 out:
 	if (error)
 		nfs_boot_cleanup(nd, l);
 	kmem_free(nd, sizeof(*nd));
 	return (error);
+}
 /*
  * Internal version of mount system call for diskless setup.
  * Separate function because we used to call it twice.
  * (once for root and once for swap)
  */
 static int
 nfs_mount_diskless(struct nfs_dlmount *ndmntp, const char *mntname, struct mount **mpp, struct vnode **vpp, struct lwp *l)
 	/* mntname:	 mount point name */
+{
 	struct mount *mp;
 	struct mbuf *m;
 	int error;
 	vfs_rootmountalloc(MOUNT_NFS, mntname, &mp);
 	mp->mnt_op = &nfs_vfsops;
 	/*
 	 * Historical practice expects NFS root file systems to
 	 * be initially mounted r/w.
 	 */
 	mp->mnt_flag &= ~MNT_RDONLY;
 	/* Get mbuf for server sockaddr. */
 	m = m_get(M_WAIT, MT_SONAME);
 	if (m == NULL)
 		panic("nfs_mountroot: mget soname for %s", mntname);
 	MCLAIM(m, &nfs_mowner);
 	memcpy(mtod(m, void *), (void *)ndmntp->ndm_args.addr,
 	      (m->m_len = ndmntp->ndm_args.addr->sa_len));
 	error = mountnfs(&ndmntp->ndm_args, mp, m, mntname,
 			 ndmntp->ndm_args.hostname, vpp, l);
 	if (error) {
 		vfs_unbusy(mp);
 		vfs_rele(mp);
 		printf("nfs_mountroot: mount %s failed: %d\n",
 		       mntname, error);
 	} else
 		*mpp = mp;
 	return (error);
+}
 void
 nfs_decode_args(struct nfsmount *nmp, struct nfs_args *argp, struct lwp *l)
+{
 	int s;
 	int adjsock;
 	int maxio;
 	s = splsoftnet();
 	/*
 	 * Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
 	 * no sense in that context.
 	 */
 	if (argp->sotype == SOCK_STREAM)
 		argp->flags &= ~NFSMNT_NOCONN;
 	/*
 	 * Cookie translation is not needed for v2, silently ignore it.
 	 */
 	if ((argp->flags & (NFSMNT_XLATECOOKIE|NFSMNT_NFSV3)) ==
 	    NFSMNT_XLATECOOKIE)
 		argp->flags &= ~NFSMNT_XLATECOOKIE;
 	/* 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. */
 	nmp->nm_flag = argp->flags;
 	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;
+	}
 #ifndef NFS_V2_ONLY
 	if (argp->flags & NFSMNT_NFSV3) {
 		if (argp->sotype == SOCK_DGRAM)
 			maxio = NFS_MAXDGRAMDATA;
 		else
 			maxio = NFS_MAXDATA;
 	} else
 #endif
 		maxio = NFS_V2MAXDATA;
 	if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
 		int osize = nmp->nm_wsize;
 		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;
 		adjsock |= (nmp->nm_wsize != osize);
+	}
 	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) {
 		int osize = nmp->nm_rsize;
 		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;
 		adjsock |= (nmp->nm_rsize != osize);
+	}
 	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;
 		/* Round down to multiple of minimum blocksize */
 		nmp->nm_readdirsize &= ~(NFS_DIRFRAGSIZ - 1);
 		if (nmp->nm_readdirsize < NFS_DIRFRAGSIZ)
 			nmp->nm_readdirsize = NFS_DIRFRAGSIZ;
 		/* Bigger than buffer size makes no sense */
 		if (nmp->nm_readdirsize > NFS_DIRBLKSIZ)
 			nmp->nm_readdirsize = NFS_DIRBLKSIZ;
 	} else if (argp->flags & NFSMNT_RSIZE)
 		nmp->nm_readdirsize = nmp->nm_rsize;
 	if (nmp->nm_readdirsize > maxio)
 		nmp->nm_readdirsize = maxio;
 	if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
 		argp->maxgrouplist <= NFS_MAXGRPS)
 		nmp->nm_numgrps = argp->maxgrouplist;
 	if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
 		argp->readahead <= NFS_MAXRAHEAD)
 		nmp->nm_readahead = argp->readahead;
 	if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
 		argp->deadthresh <= NFS_NEVERDEAD)
 		nmp->nm_deadthresh = argp->deadthresh;
 	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, (struct nfsreq *)0, l)) {
 				printf("nfs_args: retrying connect\n");
 				kpause("nfscn3", false, hz, NULL);
+			}
+	}
+}
 /*
  * VFS Operations.
+ *
  * mount system call
  * It seems a bit dumb to copyinstr() the host and path here and then
  * memcpy() 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 */
 int
 nfs_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
+{
 	struct lwp *l = curlwp;
 	int error;
 	struct nfs_args *args = data;
 	struct mbuf *nam;
 	struct nfsmount *nmp = VFSTONFS(mp);
 	struct sockaddr *sa;
 	struct vnode *vp;
 	char *pth, *hst;
 	size_t len;
 	u_char *nfh;
 	if (args == NULL)
 		return EINVAL;
 	if (*data_len < sizeof *args)
 		return EINVAL;
 	if (mp->mnt_flag & MNT_GETARGS) {
 		if (nmp == NULL)
 			return (EIO);
 		if (args->addr != NULL) {
 			sa = mtod(nmp->nm_nam, struct sockaddr *);
 			error = copyout(sa, args->addr, sa->sa_len);
 			if (error)
 				return (error);
 			args->addrlen = sa->sa_len;
 		} else
 			args->addrlen = 0;
 		args->version = NFS_ARGSVERSION;
 		args->sotype = nmp->nm_sotype;
 		args->proto = nmp->nm_soproto;
 		args->fh = NULL;
 		args->fhsize = 0;
 		args->flags = nmp->nm_flag;
 		args->wsize = nmp->nm_wsize;
 		args->rsize = nmp->nm_rsize;
 		args->readdirsize = nmp->nm_readdirsize;
 		args->timeo = nmp->nm_timeo;
 		args->retrans = nmp->nm_retry;
 		args->maxgrouplist = nmp->nm_numgrps;
 		args->readahead = nmp->nm_readahead;
 		args->leaseterm = 0; /* dummy */
 		args->deadthresh = nmp->nm_deadthresh;
 		args->hostname = NULL;
 		*data_len = sizeof *args;
 		return 0;
+	}
 	if (args->version != NFS_ARGSVERSION)
 		return (EPROGMISMATCH);
 	if (args->flags & (NFSMNT_NQNFS|NFSMNT_KERB))
 		return (EPROGUNAVAIL);
 #ifdef NFS_V2_ONLY
 	if (args->flags & NFSMNT_NFSV3)
 		return (EPROGMISMATCH);
 #endif
 	if (mp->mnt_flag & MNT_UPDATE) {
 		if (nmp == NULL)
 			return (EIO);
 		/*
 		 * When doing an update, we can't change from or to
 		 * v3, or change cookie translation
 		 */
 		args->flags = (args->flags & ~(NFSMNT_NFSV3|NFSMNT_XLATECOOKIE)) |
 		    (nmp->nm_flag & (NFSMNT_NFSV3|NFSMNT_XLATECOOKIE));
 		nfs_decode_args(nmp, args, l);
 		return (0);
+	}
 	if (args->fhsize < 0 || args->fhsize > NFSX_V3FHMAX)
 		return (EINVAL);
 	nfh = malloc(NFSX_V3FHMAX, M_TEMP, M_WAITOK);
 	error = copyin(args->fh, nfh, args->fhsize);
 	if (error)
 		goto free_nfh;
 	pth = malloc(MNAMELEN, M_TEMP, M_WAITOK);
 	error = copyinstr(path, pth, MNAMELEN - 1, &len);
 	if (error)
 		goto free_pth;
 	memset(&pth[len], 0, MNAMELEN - len);
 	hst = malloc(MNAMELEN, M_TEMP, M_WAITOK);
 	error = copyinstr(args->hostname, hst, MNAMELEN - 1, &len);
 	if (error)
 		goto free_hst;
 	memset(&hst[len], 0, MNAMELEN - len);
 	/* sockargs() call must be after above copyin() calls */
 	error = sockargs(&nam, args->addr, args->addrlen, UIO_USERSPACE,
 	    MT_SONAME);
 	if (error)
 		goto free_hst;
 	MCLAIM(nam, &nfs_mowner);
 	args->fh = nfh;
 	error = mountnfs(args, mp, nam, pth, hst, &vp, l);
 free_hst:
 	free(hst, M_TEMP);
 free_pth:
 	free(pth, M_TEMP);
 free_nfh:
 	free(nfh, M_TEMP);
 	return (error);
+}
 /*
  * Common code for mount and mountroot
  */
 int
 mountnfs(struct nfs_args *argp, struct mount *mp, struct mbuf *nam, const char *pth, const char *hst, struct vnode **vpp, struct lwp *l)
+{
 	struct nfsmount *nmp;
 	struct nfsnode *np;
 	struct vnode *vp;
 	int error;
 	struct vattr *attrs;
 	kauth_cred_t cr;
 	char iosname[IOSTATNAMELEN];
 	/*
 	 * If the number of nfs iothreads to use has never
 	 * been set, create a reasonable number of them.
 	 */
 	if (nfs_niothreads < 0) {
 		nfs_set_niothreads(NFS_DEFAULT_NIOTHREADS);
+	}
 	if (mp->mnt_flag & MNT_UPDATE) {
 		nmp = VFSTONFS(mp);
 		/* update paths, file handles, etc, here	XXX */
 		m_freem(nam);
-		return (0);
+		return 0;
 	} else {
 		nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP);
 		mp->mnt_data = nmp;
 		TAILQ_INIT(&nmp->nm_uidlruhead);
 		TAILQ_INIT(&nmp->nm_bufq);
 		rw_init(&nmp->nm_writeverflock);
 		mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE);
 		cv_init(&nmp->nm_rcvcv, "nfsrcv");
 		cv_init(&nmp->nm_sndcv, "nfssnd");
 		cv_init(&nmp->nm_aiocv, "nfsaio");
 		cv_init(&nmp->nm_disconcv, "nfsdis");
+	}
 	nmp = kmem_zalloc(sizeof(*nmp), KM_SLEEP);
 	TAILQ_INIT(&nmp->nm_uidlruhead);
 	TAILQ_INIT(&nmp->nm_bufq);
 	rw_init(&nmp->nm_writeverflock);
 	mutex_init(&nmp->nm_lock, MUTEX_DEFAULT, IPL_NONE);
 	cv_init(&nmp->nm_rcvcv, "nfsrcv");
 	cv_init(&nmp->nm_sndcv, "nfssnd");
 	cv_init(&nmp->nm_aiocv, "nfsaio");
 	cv_init(&nmp->nm_disconcv, "nfsdis");
 	mp->mnt_data = nmp;
 	mp->mnt_stat.f_namemax = NFS_MAXNAMLEN;
 	vfs_getnewfsid(mp);
 	nmp->nm_mountp = mp;
 #ifndef NFS_V2_ONLY
 	if ((argp->flags & NFSMNT_NFSV3) == 0)
 #endif
+	{
 		if (argp->fhsize != NFSX_V2FH) {
 			return EINVAL;
+		}
+	}
 	/*
 	 * V2 can only handle 32 bit filesizes. For v3, nfs_fsinfo
 	 * will overwrite this.
 	 */
 	nmp->nm_maxfilesize = 0xffffffffLL;
 	nmp->nm_timeo = NFS_TIMEO;
 	nmp->nm_retry = NFS_RETRANS;
 	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_DEFDEADTHRESH;
 	error = set_statvfs_info(pth, UIO_SYSSPACE, hst, UIO_SYSSPACE,
 	    mp->mnt_op->vfs_name, mp, l);
 	if (error)
 		goto bad;
 	nmp->nm_nam = nam;
 	/* Set up the sockets and per-host congestion */
 	nmp->nm_sotype = argp->sotype;
 	nmp->nm_soproto = argp->proto;
 	nfs_decode_args(nmp, argp, l);
 	mp->mnt_fs_bshift = ffs(MIN(nmp->nm_rsize, nmp->nm_wsize)) - 1;
 	mp->mnt_dev_bshift = DEV_BSHIFT;
 	/*
 	 * 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, (struct nfsreq *)0, l)))
 		goto bad;
 	/*
 	 * This is silly, but it has to be set so that vinifod() works.
 	 * We do not want to do an nfs_statvfs() 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_MAXDGRAMDATA;
 	error = nfs_nget(mp, (nfsfh_t *)argp->fh, argp->fhsize, &np);
 	if (error)
 		goto bad;
 	vp = NFSTOV(np);
 	attrs = malloc(sizeof(struct vattr), M_TEMP, M_WAITOK);
 	VOP_GETATTR(vp, attrs, l->l_cred);
 	if ((nmp->nm_flag & NFSMNT_NFSV3) && (vp->v_type == VDIR)) {
 		cr = kauth_cred_alloc();
 		kauth_cred_setuid(cr, attrs->va_uid);
 		kauth_cred_seteuid(cr, attrs->va_uid);
 		kauth_cred_setsvuid(cr, attrs->va_uid);
 		kauth_cred_setgid(cr, attrs->va_gid);
 		kauth_cred_setegid(cr, attrs->va_gid);
 		kauth_cred_setsvgid(cr, attrs->va_gid);
 		nfs_cookieheuristic(vp, &nmp->nm_iflag, l, cr);
 		kauth_cred_free(cr);
+	}
 	free(attrs, M_TEMP);
 	/*
 	 * 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 == UFS_ROOTINO (2). So, just unlock, but no rele.
 	 */
 	nmp->nm_vnode = vp;
 	if (vp->v_type == VNON)
 		vp->v_type = VDIR;
 	vp->v_vflag |= VV_ROOT;
 	VOP_UNLOCK(vp);
 	*vpp = vp;
 	snprintf(iosname, sizeof(iosname), "nfs%u", nfs_mount_count++);
 	nmp->nm_stats = iostat_alloc(IOSTAT_NFS, nmp, iosname);
 	return (0);
 bad:
 	nfs_disconnect(nmp);
 	rw_destroy(&nmp->nm_writeverflock);
 	mutex_destroy(&nmp->nm_lock);
 	cv_destroy(&nmp->nm_rcvcv);
 	cv_destroy(&nmp->nm_sndcv);
 	cv_destroy(&nmp->nm_aiocv);
 	cv_destroy(&nmp->nm_disconcv);
 	kmem_free(nmp, sizeof(*nmp));
 	m_freem(nam);
 	return (error);
+}
 /*
  * unmount system call
  */
 int
 nfs_unmount(struct mount *mp, int mntflags)
+{
 	struct nfsmount *nmp = VFSTONFS(mp);
 	struct vnode *vp;
 	int error, flags = 0;
 	if (mntflags & MNT_FORCE) {
 		mutex_enter(&nmp->nm_lock);
 		flags |= FORCECLOSE;
 		nmp->nm_iflag |= NFSMNT_DISMNTFORCE;
 		mutex_exit(&nmp->nm_lock);
+	}
 	/*
 	 * Goes something like this..
 	 * - Check for activity on the root vnode (other than ourselves).
 	 * - Call vflush() to clear out vnodes for this file system,
 	 *   except for the root vnode.
 	 * - Decrement reference on the vnode representing remote root.
 	 * - Close the socket
 	 * - Free up the data structures
 	 */
 	/*
 	 * We need to decrement the ref. count on the nfsnode representing
 	 * the remote root.  See comment in mountnfs().
 	 */
 	vp = nmp->nm_vnode;
 	error = vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 	if (error != 0)
 		goto err;
 	if ((mntflags & MNT_FORCE) == 0 && vrefcnt(vp) > 1) {
 		VOP_UNLOCK(vp);
 		error = EBUSY;
 		goto err;
+	}
 	error = vflush(mp, vp, flags);
 	if (error) {
 		VOP_UNLOCK(vp);
 		goto err;
+	}
 	/*
 	 * We are now committed to the unmount; mark the mount structure
 	 * as doomed so that any sleepers kicked awake by nfs_disconnect
 	 * will go away cleanly.
 	 */
 	nmp->nm_iflag |= NFSMNT_DISMNT;
 	/*
 	 * No new async I/O will be added, but await for pending
 	 * ones to drain.
 	 */
 	while (nfs_iodbusy(nmp))
 		kpause("nfsumnt", false, hz, NULL);
 	/*
 	 * Clean up the stats... note that we carefully avoid decrementing
 	 * nfs_mount_count here for good reason - we may not be unmounting
 	 * the last thing mounted.
 	 */
 	iostat_free(nmp->nm_stats);
 	/*
 	 * There is one reference count to get rid of here
 	 * (see comment in mountnfs()).
 	 */
 	VOP_UNLOCK(vp);
 	vgone(vp);
 	nfs_disconnect(nmp);
 	m_freem(nmp->nm_nam);
 	rw_destroy(&nmp->nm_writeverflock);
 	mutex_destroy(&nmp->nm_lock);
 	cv_destroy(&nmp->nm_rcvcv);
 	cv_destroy(&nmp->nm_sndcv);
 	cv_destroy(&nmp->nm_aiocv);
 	cv_destroy(&nmp->nm_disconcv);
 	kmem_free(nmp, sizeof(*nmp));
 	return (0);
 err:
 	if (mntflags & MNT_FORCE) {
 		mutex_enter(&nmp->nm_lock);
 		nmp->nm_iflag &= ~NFSMNT_DISMNTFORCE;
 		mutex_exit(&nmp->nm_lock);
+	}
 	return error;
+}
 /*
  * Return root of a filesystem
  */
 int
 nfs_root(struct mount *mp, int lktype, struct vnode **vpp)
+{
 	struct vnode *vp;
 	struct nfsmount *nmp;
 	int error;
 	nmp = VFSTONFS(mp);
 	vp = nmp->nm_vnode;
 	vref(vp);
 	error = vn_lock(vp, lktype | LK_RETRY);
 	if (error != 0) {
 		vrele(vp);
 		return error;
+	}
 	*vpp = vp;
 	return (0);
+}
 extern int syncprt;
 static bool
 nfs_sync_selector(void *cl, struct vnode *vp)
+{
 	KASSERT(mutex_owned(vp->v_interlock));
 	return !LIST_EMPTY(&vp->v_dirtyblkhd) ||
 	    (vp->v_iflag & VI_ONWORKLST) != 0;
+}
 /*
  * Flush out the buffer cache
  */
 /* ARGSUSED */
 int
 nfs_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
+{
 	struct vnode *vp;
 	struct vnode_iterator *marker;
 	int error, allerror = 0;
 	/*
 	 * Force stale buffer cache information to be flushed.
 	 */
 	vfs_vnode_iterator_init(mp, &marker);
 	while ((vp = vfs_vnode_iterator_next(marker, nfs_sync_selector,
 	    NULL)))
+	{
 		error = vn_lock(vp, LK_EXCLUSIVE);
 		if (error) {
 			vrele(vp);
 			continue;
+		}
 		error = VOP_FSYNC(vp, cred,
 		    waitfor == MNT_WAIT ? FSYNC_WAIT : 0, 0, 0);
 		if (error)
 			allerror = error;
 		vput(vp);
+	}
 	vfs_vnode_iterator_destroy(marker);
 	return allerror;
+}
 /*
  * NFS flat namespace lookup.
  * Currently unsupported.
  */
 /* ARGSUSED */
 int
 nfs_vget(struct mount *mp, ino_t ino, int lktype, struct vnode **vpp)
+{
 	return (EOPNOTSUPP);
+}
 /*
  * Do that sysctl thang...
  */
 static int
 sysctl_vfs_nfs_iothreads(SYSCTLFN_ARGS)
+{
 	struct sysctlnode node;
 	int val;
 	int error;
 	val = nfs_niothreads;
 	node = *rnode;
 	node.sysctl_data = &val;
         error = sysctl_lookup(SYSCTLFN_CALL(&node));
 	if (error || newp == NULL)
 		return error;
 	return nfs_set_niothreads(val);
+}
 SYSCTL_SETUP(nfs_sysctl_init, "nfs sysctl")
+{
 	sysctl_createv(clog, 0, NULL, NULL,
 		       CTLFLAG_PERMANENT,
 		       CTLTYPE_NODE, "nfs",
 		       SYSCTL_DESCR("NFS vfs options"),
 		       NULL, 0, NULL, 0,
 		       CTL_VFS, 2, CTL_EOL);
 	/*
 	 * XXX the "2" above could be dynamic, thereby eliminating one
 	 * more instance of the "number to vfs" mapping problem, but
 	 * "2" is the order as taken from sys/mount.h
 	 */
 	sysctl_createv(clog, 0, NULL, NULL,
 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 		       CTLTYPE_STRUCT, "nfsstats",
 		       SYSCTL_DESCR("NFS operation statistics"),
 		       NULL, 0, &nfsstats, sizeof(nfsstats),
 		       CTL_VFS, 2, NFS_NFSSTATS, CTL_EOL);
 	sysctl_createv(clog, 0, NULL, NULL,
 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
 		       CTLTYPE_INT, "iothreads",
 		       SYSCTL_DESCR("Number of NFS client processes desired"),
 		       sysctl_vfs_nfs_iothreads, 0, NULL, 0,
 		       CTL_VFS, 2, NFS_IOTHREADS, CTL_EOL);
+}
 /* ARGSUSED */
 int
 nfs_fhtovp(struct mount *mp, struct fid *fid, int lktype, struct vnode **vpp)
+{
 	size_t fidsize;
 	size_t fhsize;
 	struct nfsnode *np;
 	int error;
 	struct vattr va;
 	fidsize = fid->fid_len;
 	if (fidsize < sizeof(*fid)) {
 		return EINVAL;
+	}
 	fhsize = fidsize - sizeof(*fid);
 	if ((fhsize % NFSX_UNSIGNED) != 0) {
 		return EINVAL;
+	}
 	if ((VFSTONFS(mp)->nm_flag & NFSMNT_NFSV3) != 0) {
 		if (fhsize > NFSX_V3FHMAX || fhsize == 0) {
 			return EINVAL;
+		}
 	} else {
 		if (fhsize != NFSX_V2FH) {
 			return EINVAL;
+		}
+	}
 	/* XXX lktype ignored */
 	error = nfs_nget(mp, (void *)fid->fid_data, fhsize, &np);
 	if (error) {
 		return error;
+	}
 	*vpp = NFSTOV(np);
 	error = VOP_GETATTR(*vpp, &va, kauth_cred_get());
 	if (error != 0) {
 		vput(*vpp);
 		*vpp = NULLVP;
+	}
 	return error;
+}
 /* ARGSUSED */
 int
 nfs_vptofh(struct vnode *vp, struct fid *buf, size_t *bufsize)
+{
 	struct nfsnode *np;
 	struct fid *fid;
 	size_t fidsize;
 	int error = 0;
 	np = VTONFS(vp);
 	fidsize = sizeof(*fid) + np->n_fhsize;
 	if (*bufsize < fidsize) {
 		error = E2BIG;
+	}
 	*bufsize = fidsize;
 	if (error == 0) {
 		struct fid fid_store;
 		fid = &fid_store;
 		memset(fid, 0, sizeof(*fid));
 		fid->fid_len = fidsize;
 		memcpy(buf, fid, sizeof(*fid));
 		memcpy(buf->fid_data, np->n_fhp, np->n_fhsize);
+	}
 	return error;
+}
 /*
  * Vfs start routine, a no-op.
  */
 /* ARGSUSED */
 int
 nfs_start(struct mount *mp, int flags)
+{
 	return (0);
+}
 /*
  * Called once at VFS init to initialize client-specific data structures.
  */
 void
 nfs_vfs_init(void)
+{
 	/* Initialize NFS server / client shared data. */
 	nfs_init();
 	nfs_node_init();
 	/* Initialize the kqueue structures */
 	nfs_kqinit();
 	/* Initialize the iod structures */
 	nfs_iodinit();
 	nfs_commitsize = uvmexp.npages << (PAGE_SHIFT - 4);
+}
 void
 nfs_vfs_done(void)
+{
 	nfs_node_done();
 	nfs_kqfini();
 	nfs_iodfini();
 	nfs_fini();
+}