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|
Setup
=====
$ RO_KEY=$(ceph auth get-or-create-key client.ro mon 'profile rbd' mgr 'profile rbd' osd 'profile rbd-read-only')
$ rbd create --size 10 img
$ rbd snap create --no-progress img@snap
$ rbd snap protect img@snap
$ rbd clone img@snap cloneimg
$ rbd create --size 1 imgpart
$ DEV=$(sudo rbd map imgpart)
$ cat <<EOF | sudo sfdisk $DEV >/dev/null 2>&1
> unit: sectors
> /dev/rbd0p1 : start= 512, size= 512, Id=83
> /dev/rbd0p2 : start= 1024, size= 512, Id=83
> EOF
$ sudo rbd unmap $DEV
$ rbd snap create --no-progress imgpart@snap
Image HEAD
==========
R/W, unpartitioned:
$ DEV=$(sudo rbd map img)
$ blockdev --getro $DEV
0
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
$ blkdiscard $DEV
$ blockdev --setro $DEV
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setro $DEV
$ blockdev --getro $DEV
1
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?': Operation not permitted (glob)
[1]
$ blkdiscard $DEV
blkdiscard: /dev/rbd?: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ blockdev --setrw $DEV
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw $DEV
$ blockdev --getro $DEV
0
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
$ blkdiscard $DEV
$ sudo rbd unmap $DEV
R/W, partitioned:
$ DEV=$(sudo rbd map imgpart)
$ udevadm settle
$ blockdev --getro ${DEV}p1
0
$ blockdev --getro ${DEV}p2
0
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p1
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p2
$ blockdev --setro ${DEV}p1
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setro ${DEV}p1
$ blockdev --getro ${DEV}p1
1
$ blockdev --getro ${DEV}p2
0
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p1': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p1
blkdiscard: /dev/rbd?p1: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p2
$ blockdev --setrw ${DEV}p1
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw ${DEV}p1
$ blockdev --getro ${DEV}p1
0
$ blockdev --getro ${DEV}p2
0
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p1
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p2
$ sudo rbd unmap $DEV
$ DEV=$(sudo rbd map imgpart)
$ udevadm settle
$ blockdev --getro ${DEV}p1
0
$ blockdev --getro ${DEV}p2
0
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p1
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p2
$ blockdev --setro ${DEV}p2
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setro ${DEV}p2
$ blockdev --getro ${DEV}p1
0
$ blockdev --getro ${DEV}p2
1
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p1
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p2': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p2
blkdiscard: /dev/rbd?p2: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ blockdev --setrw ${DEV}p2
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw ${DEV}p2
$ blockdev --getro ${DEV}p1
0
$ blockdev --getro ${DEV}p2
0
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p1
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
$ blkdiscard ${DEV}p2
$ sudo rbd unmap $DEV
R/O, unpartitioned:
$ DEV=$(sudo rbd map --read-only img)
$ blockdev --getro $DEV
1
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?': Operation not permitted (glob)
[1]
$ blkdiscard $DEV
blkdiscard: /dev/rbd?: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ blockdev --setrw $DEV
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw $DEV # succeeds but effectively ignored
$ blockdev --getro $DEV
1
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?': Operation not permitted (glob)
[1]
$ blkdiscard $DEV
blkdiscard: /dev/rbd?: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ sudo rbd unmap $DEV
R/O, partitioned:
$ DEV=$(sudo rbd map --read-only imgpart)
$ udevadm settle
$ blockdev --getro ${DEV}p1
1
$ blockdev --getro ${DEV}p2
1
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p1': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p1
blkdiscard: /dev/rbd?p1: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p2': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p2
blkdiscard: /dev/rbd?p2: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ blockdev --setrw ${DEV}p1
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw ${DEV}p1 # succeeds but effectively ignored
$ blockdev --setrw ${DEV}p2
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw ${DEV}p2 # succeeds but effectively ignored
$ blockdev --getro ${DEV}p1
1
$ blockdev --getro ${DEV}p2
1
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p1': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p1
blkdiscard: /dev/rbd?p1: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p2': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p2
blkdiscard: /dev/rbd?p2: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ sudo rbd unmap $DEV
Image snapshot
==============
Unpartitioned:
$ DEV=$(sudo rbd map img@snap)
$ blockdev --getro $DEV
1
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?': Operation not permitted (glob)
[1]
$ blkdiscard $DEV
blkdiscard: /dev/rbd?: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ blockdev --setrw $DEV
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw $DEV # succeeds but effectively ignored
$ blockdev --getro $DEV
1
$ dd if=/dev/urandom of=$DEV bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?': Operation not permitted (glob)
[1]
$ blkdiscard $DEV
blkdiscard: /dev/rbd?: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ sudo rbd unmap $DEV
Partitioned:
$ DEV=$(sudo rbd map imgpart@snap)
$ udevadm settle
$ blockdev --getro ${DEV}p1
1
$ blockdev --getro ${DEV}p2
1
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p1': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p1
blkdiscard: /dev/rbd?p1: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p2': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p2
blkdiscard: /dev/rbd?p2: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ blockdev --setrw ${DEV}p1
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw ${DEV}p1 # succeeds but effectively ignored
$ blockdev --setrw ${DEV}p2
.*BLKROSET: Permission denied (re)
[1]
$ sudo blockdev --setrw ${DEV}p2 # succeeds but effectively ignored
$ blockdev --getro ${DEV}p1
1
$ blockdev --getro ${DEV}p2
1
$ dd if=/dev/urandom of=${DEV}p1 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p1': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p1
blkdiscard: /dev/rbd?p1: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ dd if=/dev/urandom of=${DEV}p2 bs=1k seek=1 count=1 status=none
dd: error writing '/dev/rbd?p2': Operation not permitted (glob)
[1]
$ blkdiscard ${DEV}p2
blkdiscard: /dev/rbd?p2: BLKDISCARD ioctl failed: Operation not permitted (glob)
[1]
$ sudo rbd unmap $DEV
read-only OSD caps
==================
R/W:
$ DEV=$(sudo rbd map --id ro --key $(echo $RO_KEY) img)
rbd: sysfs write failed
rbd: map failed: (1) Operation not permitted
[1]
R/O:
$ DEV=$(sudo rbd map --id ro --key $(echo $RO_KEY) --read-only img)
$ blockdev --getro $DEV
1
$ sudo rbd unmap $DEV
Snapshot:
$ DEV=$(sudo rbd map --id ro --key $(echo $RO_KEY) img@snap)
$ blockdev --getro $DEV
1
$ sudo rbd unmap $DEV
R/W, clone:
$ DEV=$(sudo rbd map --id ro --key $(echo $RO_KEY) cloneimg)
rbd: sysfs write failed
rbd: map failed: (1) Operation not permitted
[1]
R/O, clone:
$ DEV=$(sudo rbd map --id ro --key $(echo $RO_KEY) --read-only cloneimg)
$ blockdev --getro $DEV
1
$ sudo rbd unmap $DEV
rw -> ro with open_count > 0
============================
$ DEV=$(sudo rbd map img)
$ { sleep 10; sudo blockdev --setro $DEV; } &
$ dd if=/dev/urandom of=$DEV bs=1k oflag=direct status=noxfer
dd: error writing '/dev/rbd?': Operation not permitted (glob)
[1-9]\d*\+0 records in (re)
[1-9]\d*\+0 records out (re)
[1]
$ sudo rbd unmap $DEV
"-o rw --read-only" should result in read-only mapping
======================================================
$ DEV=$(sudo rbd map -o rw --read-only img)
$ blockdev --getro $DEV
1
$ sudo rbd unmap $DEV
Teardown
========
$ rbd snap purge imgpart >/dev/null 2>&1
$ rbd rm imgpart >/dev/null 2>&1
$ rbd rm cloneimg >/dev/null 2>&1
$ rbd snap unprotect img@snap
$ rbd snap purge img >/dev/null 2>&1
$ rbd rm img >/dev/null 2>&1
|
