Date: Sun, 7 Apr 2013 17:54:38 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: lev@FreeBSD.org Cc: freebsd-fs@freebsd.org Subject: Re: ZFS snapshots and daily security checks Message-ID: <20130408005438.GA66727@icarus.home.lan>
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> Here is strange difference between `mount' and `mount -p' output: > `mount' doesn't show mounted ZFS snapshots, but `mount -p' does. > > Is it possible to exclude these snapshots from `mount -p' output or > don't mount them to hierarchy by default? Taken from my stable/9 r249160 system: root@icarus:~ # df -k Filesystem 1024-blocks Used Avail Capacity Mounted on /dev/ada0p2 2063900 664952 1233836 35% / devfs 1 1 0 100% /dev /dev/ada0p4 16503324 147416 15035644 1% /var /dev/ada0p5 16503324 44 15183016 0% /tmp /dev/ada0p6 25316000 6612788 16677932 28% /usr backups 1915745760 469845400 1445900360 25% /backups data/home 1462173974 16568039 1445605935 1% /home data/storage 1897306539 451700604 1445605935 24% /storage devfs 1 1 0 100% /var/named/dev root@icarus:~ # zfs snapshot -r data/home@now root@icarus:~ # touch /home/ilikedata root@icarus:~ # zfs list -t snapshot NAME USED AVAIL REFER MOUNTPOINT data/home@now 160K - 15.8G - root@icarus:~ # /sbin/mount -p /dev/ada0p2 / ufs rw 1 1 devfs /dev devfs rw,multilabel 0 0 /dev/ada0p4 /var ufs rw 2 2 /dev/ada0p5 /tmp ufs rw 2 2 /dev/ada0p6 /usr ufs rw 2 2 backups /backups zfs rw,nfsv4acls 0 0 data/home /home zfs rw,nfsv4acls 0 0 data/storage /storage zfs rw,nfsv4acls 0 0 devfs /var/named/dev devfs rw,multilabel 0 0 root@icarus:~ # /sbin/mount /dev/ada0p2 on / (ufs, local) devfs on /dev (devfs, local, multilabel) /dev/ada0p4 on /var (ufs, local, soft-updates) /dev/ada0p5 on /tmp (ufs, local, soft-updates) /dev/ada0p6 on /usr (ufs, local, soft-updates) backups on /backups (zfs, local, nfsv4acls) data/home on /home (zfs, local, nfsv4acls) data/storage on /storage (zfs, local, nfsv4acls) devfs on /var/named/dev (devfs, local, multilabel) And now after mounting the snapshot: root@icarus:~ # /sbin/mount -t zfs data/home@now /mnt root@icarus:~ # df -k Filesystem 1024-blocks Used Avail Capacity Mounted on /dev/ada0p2 2063900 664952 1233836 35% / devfs 1 1 0 100% /dev /dev/ada0p4 16503324 147416 15035644 1% /var /dev/ada0p5 16503324 44 15183016 0% /tmp /dev/ada0p6 25316000 6612788 16677932 28% /usr backups 1915745760 469845400 1445900360 25% /backups data/home 1462173553 16568044 1445605509 1% /home data/storage 1897306113 451700604 1445605509 24% /storage devfs 1 1 0 100% /var/named/dev data/home@now 1462173553 16568044 1445605509 1% /mnt root@icarus:~ # /sbin/mount -p /dev/ada0p2 / ufs rw 1 1 devfs /dev devfs rw,multilabel 0 0 /dev/ada0p4 /var ufs rw 2 2 /dev/ada0p5 /tmp ufs rw 2 2 /dev/ada0p6 /usr ufs rw 2 2 backups /backups zfs rw,nfsv4acls 0 0 data/home /home zfs rw,nfsv4acls 0 0 data/storage /storage zfs rw,nfsv4acls 0 0 devfs /var/named/dev devfs rw,multilabel 0 0 data/home@now /mnt zfs ro,noatime,nfsv4acls 0 0 root@icarus:~ # /sbin/mount /dev/ada0p2 on / (ufs, local) devfs on /dev (devfs, local, multilabel) /dev/ada0p4 on /var (ufs, local, soft-updates) /dev/ada0p5 on /tmp (ufs, local, soft-updates) /dev/ada0p6 on /usr (ufs, local, soft-updates) backups on /backups (zfs, local, nfsv4acls) data/home on /home (zfs, local, nfsv4acls) data/storage on /storage (zfs, local, nfsv4acls) devfs on /var/named/dev (devfs, local, multilabel) data/home@now on /mnt (zfs, local, noatime, read-only, nfsv4acls) It seems to me mount and mount -p show the mounted snapshot. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB |
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