Index: user/pho/stress2/misc/mountu.sh =================================================================== --- user/pho/stress2/misc/mountu.sh (revision 345840) +++ user/pho/stress2/misc/mountu.sh (revision 345841) @@ -1,285 +1,286 @@ #!/bin/sh # # SPDX-License-Identifier: BSD-2-Clause-FreeBSD # +# Copyright (c) 2012 Peter Holm # Copyright (c) 2019 Dell EMC Isilon # # 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. # # THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. # # $FreeBSD$ # # Change mount point from rw to ro with a file mapped rw # Currently fails for NFS # Page fault seen: # https://people.freebsd.org/~pho/stress/log/mountu.txt # Fixed by: r285039. [ `id -u ` -ne 0 ] && echo "Must be root!" && exit 1 . ../default.cfg here=`pwd` cd /tmp sed '1,/^EOF/d' < $here/$0 > mountu.c mycc -o mountu -Wall -Wextra -O2 mountu.c || exit 1 rm -f mountu.c pstat() { local pid pid=`ps ax | grep -v grep | grep /tmp/mountu | awk '{print $1}'` [ -n "$pid" ] && procstat -v $pid } ck() { if mount | grep $mntpoint | grep -q "read-only"; then if pstat $!| awk "\$2 == \"$map\"" | grep -q " rw-"; then echo echo "$1 difference" mount | grep $mntpoint printf "RW mount mapping and RO mount mapping:\n%s\n" "$r" pstat $! | awk "\$2 == \"$map\"" status=$((status + 1)) fi else echo "$1 mount point RO did not succeed" mount | grep $mntpoint status=$((status + 1)) fi } status=0 file=$mntpoint/mountu.sh.file mapfile=/tmp/mountu.sh.map mount | grep -q "$mntpoint " && umount $mntpoint mdconfig -l | grep -q $mdstart && mdconfig -d -u $mdstart mdconfig -a -t swap -s 100m -u $mdstart bsdlabel -w md$mdstart auto newfs $newfs_flags md${mdstart}$part > /dev/null mount /dev/md${mdstart}$part $mntpoint chmod 777 $mntpoint # ufs exec 5>$mapfile /tmp/mountu UFS $file & pid=$! sleep 1 map=`cat $mapfile`; rm $mapfile; exec 5>&- r=`pstat $! | awk "\\$2 == \"$map\""` mount -u -o ro $mntpoint 2>/dev/null || mount -fu -o ro $mntpoint ck UFS mount -u -o rw $mntpoint rm -f $file wait $pid s=$? [ $s -ne 139 ] && { echo "UFS exit status is $s"; status=1; } while mount | grep -q "$mntpoint "; do umount $mntpoint || sleep 1 done mdconfig -d -u $mdstart # nfs if ping -c 2 `echo $nfs_export | sed 's/:.*//'` > /dev/null 2>&1; then mount -t nfs -o tcp -o retrycnt=3 -o intr,soft -o rw $nfs_export \ $mntpoint sleep .2 rm -f $file /tmp/mountu NFS $file & pid=$! sleep 1 r=`pstat $! | awk "\\$2 == \"$map\""` mount -u -o ro $mntpoint 2>/dev/null || mount -fu -o ro $mntpoint 2>/dev/null ck NFS wait $pid s=$? [ $s -ne 139 ] && { echo "NFS exit status is $s"; status=1; } mount -u -o rw $mntpoint 2>/dev/null sleep .2 [ -f $file ] && rm -f $file umount $mntpoint || umount $mntpoint fi # msdos if [ -x /sbin/mount_msdosfs ]; then mdconfig -a -t swap -s 100m -u $mdstart bsdlabel -w md$mdstart auto newfs_msdos -F 16 -b 8192 /dev/md${mdstart}$part > /dev/null 2>&1 mount_msdosfs -m 777 /dev/md${mdstart}$part $mntpoint /tmp/mountu MSDOS $file & pid=$! sleep 1 r=`pstat $! | awk "\\$2 == \"$map\""` mount -u -o ro $mntpoint 2>/dev/null || mount -fu -o ro $mntpoint ck MSDOS wait $pid s=$? [ $s -ne 139 ] && { echo "MSDOS exit status is $s"; status=1; } mount -u -o rw $mntpoint rm -f $file while mount | grep -q "$mntpoint "; do umount $mntpoint || sleep 1 done mdconfig -d -u $mdstart fi # tmpfs mount -t tmpfs null $mntpoint chmod 777 $mntpoint /tmp/mountu TMPFS $file & pid=$! sleep 1 r=`pstat $! | awk "\\$2 == \"$map\""` mount -u -o ro $mntpoint 2>/dev/null || mount -fu -o ro $mntpoint ck TMPFS sleep 1 mount -u -o rw $mntpoint rm -f $file wait $pid s=$? [ $s -ne 139 ] && { echo "TMPFS exit status is $s"; status=1; } while mount | grep -q "$mntpoint "; do umount $mntpoint || sleep 1 done rm -f /tmp/mountu exit 0 EOF /* kib@ noted: UFS/NFS/msdosfs reclaim vnode on rw->ro forced remount, and change the type of the underying object to OBJT_DEAD, but leave the pages on the object queue and installed in the page tables. Applications can read/write already mapped pages, but cannot page in new pages, cannot observe possible further modifications to already mapped pages (if ro->rw remount happen later), and their updates to pages are not flushed to file. It is impossible to mimic this behaviour for tmpfs. */ #include #include #include #include #include #include #include #include #include #include #include #include #define STARTADDR 0x0U #define ADRSPACE 0x0640000U static void sighandler(int signo, siginfo_t *si, void *uc1) { ucontext_t *uc; uc = uc1; printf("SIG%s at %p, addr %p\n", sys_signame[signo], si->si_addr, #if defined(__i386__) (void *)uc->uc_mcontext.mc_eip); #else (void *)uc->uc_mcontext.mc_rip); #endif exit(1); } int main(int argc __unused, char **argv) { struct passwd *pw; struct sigaction sa; void *p; size_t len; int fd; char *name, *path; volatile char *c; memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = sighandler; sa.sa_flags = SA_SIGINFO; if (sigaction(SIGSEGV, &sa, NULL) == -1) err(1, "sigaction(SIGSEGV)"); if (sigaction(SIGBUS, &sa, NULL) == -1) err(1, "sigaction(SIGBUS)"); if ((pw = getpwnam("nobody")) == NULL) err(1, "no such user: nobody"); if (setgroups(1, &pw->pw_gid) || setegid(pw->pw_gid) || setgid(pw->pw_gid) || seteuid(pw->pw_uid) || setuid(pw->pw_uid)) err(1, "Can't drop privileges to \"nobody\""); endpwent(); p = (void *)STARTADDR; len = ADRSPACE; name = argv[1]; path = argv[2]; if ((fd = open(path, O_CREAT | O_TRUNC | O_RDWR, 0622)) == -1) err(1,"open(%s)", path); if (ftruncate(fd, len) == -1) err(1, "ftruncate"); if ((p = mmap(p, len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) == MAP_FAILED) { if (errno == ENOMEM) { warn("mmap()"); return (1); } err(1, "mmap(1)"); } dprintf(5, "%p\n", p); for (c = p; (void *)c < p + len; c += PAGE_SIZE) { *c = 1; } close(fd); sleep(5); fprintf(stderr, "%s: Late read start.\n", name); for (c = p; (void *)c < p + len; c += PAGE_SIZE) { *c = 1; } fprintf(stderr, "%s: Late read complete.\n", name); fprintf(stderr, "%s: Late write start.\n", name); for (c = p; (void *)c < p + len; c += PAGE_SIZE) { *c = 1; } fprintf(stderr, "%s: Late write complete.\n", name); return (0); }