From 7cab630ba4fb26bf85336a89d88721ed2315c46c Mon Sep 17 00:00:00 2001 From: Rick Macklem Date: Sat, 28 May 2022 15:48:40 -0700 Subject: [PATCH] mount_nfs: Only create a mounttab file entry is nmount(2) succeeds mount_nfs creates entries in the mounttab file and umount removes them. Entries in the mounttab file ae used by rpc.umntall to notify the NFS server that NFSv3 entries need to be removed when they have not been removed by umount. Without this patch, an enty will be created in the mounttab file, even if the nmount(2) syscall fails for the mount. This patch modifies the code so that the mounttab entry is only created after nmount(2) succeeds. This change only affects NFSv3 and only affects how showmount displays NFSv3 mounts. MFC after: 2 weeks --- sbin/mount_nfs/mount_nfs.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/sbin/mount_nfs/mount_nfs.c b/sbin/mount_nfs/mount_nfs.c index 898a6dc9d724..6ea861193df8 100644 --- a/sbin/mount_nfs/mount_nfs.c +++ b/sbin/mount_nfs/mount_nfs.c @@ -139,7 +139,7 @@ enum tryret { static int sec_name_to_num(const char *sec); static const char *sec_num_to_name(int num); -static int getnfsargs(char *, struct iovec **iov, int *iovlen); +static int getnfsargs(char **, char **, struct iovec **iov, int *iovlen); /* void set_rpc_maxgrouplist(int); */ static struct netconfig *getnetconf_cached(const char *netid); static const char *netidbytype(int af, int sotype); @@ -156,7 +156,7 @@ main(int argc, char *argv[]) int c; struct iovec *iov; int num, iovlen; - char *mntname, *p, *spec, *tmp; + char *host, *mntname, *p, *spec, *tmp; char mntpath[MAXPATHLEN], errmsg[255]; char hostname[MAXHOSTNAMELEN + 1], gssn[MAXHOSTNAMELEN + 50]; const char *gssname, *nmount_errstr; @@ -461,7 +461,7 @@ main(int argc, char *argv[]) __DECONST(void *, gssname), strlen(gssname) + 1); } - if (!getnfsargs(spec, &iov, &iovlen)) + if (!getnfsargs(&spec, &host, &iov, &iovlen)) exit(1); /* resolve the mountpoint with realpath(3) */ @@ -479,6 +479,9 @@ main(int argc, char *argv[]) else err(1, "nmount: %s%s%s", mntpath, errmsg[0] ? ", " : "", errmsg); + } else if (mountmode != V4 && !add_mtab(host, spec)) { + /* Add mounted file system to PATH_MOUNTTAB */ + warnx("can't update %s for %s:%s", PATH_MOUNTTAB, host, spec); } exit(0); @@ -568,15 +571,16 @@ rtm_ifinfo_sleep(time_t sec) } static int -getnfsargs(char *spec, struct iovec **iov, int *iovlen) +getnfsargs(char **specp, char **hostpp, struct iovec **iov, int *iovlen) { struct addrinfo hints, *ai_nfs, *ai; enum tryret ret; int ecode, speclen, remoteerr, offset, have_bracket = 0; - char *hostp, *delimp, *errstr; + char *hostp, *delimp, *errstr, *spec; size_t len; static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5]; + spec = *specp; if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL && *(delimp + 1) == ':') { hostp = spec + 1; @@ -718,9 +722,9 @@ getnfsargs(char *spec, struct iovec **iov, int *iovlen) freeaddrinfo(ai_nfs); build_iovec(iov, iovlen, "hostname", nam, (size_t)-1); - /* Add mounted file system to PATH_MOUNTTAB */ - if (mountmode != V4 && !add_mtab(hostp, spec)) - warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec); + + *specp = spec; + *hostpp = hostp; return (1); }