Re: glabel on 9-BETA1
On Wed, 17 Aug 2011, Andrey V. Elsukov wrote: On 17.08.2011 0:10, Mark Saad wrote: root@blindness:~# glabel label rootfs ada0p4 glabel: Can't store metadata on ada0p4: Operation not permitted. In 7.2 and prior there was a sysctl that could be tweaked to allow for this to work , kern.geom.debugflag set to 16 would allow this to work. So my question is this. Should there be any reason why "glabel label name device" on the root slice cause an issue when the slice is mounted rw ? Is this a bug ? No. It isn't. When you are doing `glabel label` you overwriting last sector of given device with glabel's metadata. So you potentially can destroy some data in it. Using kern.geom.debugflags=16 is a bad practice. The right way is creating label before creation of file system and installing OS. Also you can use UFS labels (see tunefs(8)). Or in this case, GPT labels, which are more flexible in that they can apply to non-UFS partitions as well, such as swap. 'gpart show -l' and 'gpart modify' ... /dev/gpt/ is where the labels show up. ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: glabel on 9-BETA1
On 17.08.2011 0:10, Mark Saad wrote: > root@blindness:~# glabel label rootfs ada0p4 > glabel: Can't store metadata on ada0p4: Operation not permitted. > > In 7.2 and prior there was a sysctl that could be tweaked to allow for > this to work , kern.geom.debugflag set to 16 would allow this to work. > > So my question is this. Should there be any reason why "glabel label > name device" on the root slice cause an issue > when the slice is mounted rw ? > > Is this a bug ? No. It isn't. When you are doing `glabel label` you overwriting last sector of given device with glabel's metadata. So you potentially can destroy some data in it. Using kern.geom.debugflags=16 is a bad practice. The right way is creating label before creation of file system and installing OS. Also you can use UFS labels (see tunefs(8)). -- WBR, Andrey V. Elsukov signature.asc Description: OpenPGP digital signature
Re: glabel on 9-BETA1
On Tue, Aug 16, 2011 at 5:01 PM, Test Rat wrote: > Mark Saad writes: > >> All >> I was testing out an old bug and I am not sure if there is any known >> work-around on 9-BETA/HEAD >> >> Here is the issue. Install a new server , have it boot into >> multi-user mode. Then attempt to use glabel to label the root slice >> >> root@blindness:~# glabel label rootfs ada0p4 >> glabel: Can't store metadata on ada0p4: Operation not permitted. >> >> In 7.2 and prior there was a sysctl that could be tweaked to allow for >> this to work , kern.geom.debugflag set to 16 would allow this to work. >> >> So my question is this. Should there be any reason why "glabel label >> name device" on the root slice cause an issue >> when the slice is mounted rw ? >> >> Is this a bug ? > > It's a known feature[1], see geom(4) or try below diff. > > [1] http://lists.freebsd.org/pipermail/freebsd-fs/2010-April/008290.html > > %% > Index: sys/geom/geom_subr.c > === > --- sys/geom/geom_subr.c (revision 224657) > +++ sys/geom/geom_subr.c (working copy) > @@ -807,7 +819,7 @@ g_access(struct g_consumer *cp, int dcr, int dcw, > pp, pp->name); > > /* If foot-shooting is enabled, any open on rank#1 is OK */ > - if ((g_debugflags & 16) && pp->geom->rank == 1) > + if ((g_debugflags & 16)) > ; > /* If we try exclusive but already write: fail */ > else if (dce > 0 && pw > 0) > %% > Ok so I am not using glabel as it was originally designed or intended but I was / am using in it in production to label slices. IMHO it works very well for doing this. Here is an example from a 7.3-RELEASE servers of how I am using it. [root@wfmu2~]# glabel list Geom name: da1s1 Providers: 1. Name: label/mysql/data Mediasize: 146778668544 (137G) Sectorsize: 512 Mode: r1w1e1 secoffset: 0 offset: 0 seclength: 286677087 length: 146778668544 index: 0 Consumers: 1. Name: da1s1 Mediasize: 146778669056 (137G) Sectorsize: 512 Mode: r1w1e2 Geom name: da0s1a Providers: 1. Name: label/rootfs Mediasize: 140336217600 (131G) Sectorsize: 512 Mode: r1w1e1 secoffset: 0 offset: 0 seclength: 274094175 length: 140336217600 index: 0 Consumers: 1. Name: da0s1a Mediasize: 140336218112 (131G) Sectorsize: 512 Mode: r1w1e2 Geom name: da0s1b Providers: 1. Name: label/SWAP Mediasize: 2147483136 (2.0G) Sectorsize: 512 Mode: r1w1e0 secoffset: 0 offset: 0 seclength: 4194303 length: 2147483136 index: 0 Consumers: 1. Name: da0s1b Mediasize: 2147483648 (2.0G) Sectorsize: 512 Mode: r1w1e1 Geom name: da0s1d Providers: 1. Name: label/var Mediasize: 4294966784 (4.0G) Sectorsize: 512 Mode: r1w1e1 secoffset: 0 offset: 0 seclength: 8388607 length: 4294966784 index: 0 Consumers: 1. Name: da0s1d Mediasize: 4294967296 (4.0G) Sectorsize: 512 Mode: r1w1e2 So what I am getting at is in 9 I can not label the system in the same way. So this may be a limitation of GPT but I am not sure . The reason why I was doing this is to use a standard format for fstab . Every server gets the same starting point Here is the fstab from the same server # DeviceMountpoint FStype Options DumpPass# /dev/label/rootfs / ufs rw 1 1 /dev/label/var /varufs rw 2 2 /dev/label/SWAP noneswapsw 0 0 /dev/label/mysql/data /usr/local/mysqlufs rw 1 1 Is there any reason I can not do this in 9, is it just GPT thats preventing this ? -- mark saad | nones...@longcount.org ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
Re: glabel on 9-BETA1
Mark Saad writes: > All > I was testing out an old bug and I am not sure if there is any known > work-around on 9-BETA/HEAD > > Here is the issue. Install a new server , have it boot into > multi-user mode. Then attempt to use glabel to label the root slice > > root@blindness:~# glabel label rootfs ada0p4 > glabel: Can't store metadata on ada0p4: Operation not permitted. > > In 7.2 and prior there was a sysctl that could be tweaked to allow for > this to work , kern.geom.debugflag set to 16 would allow this to work. > > So my question is this. Should there be any reason why "glabel label > name device" on the root slice cause an issue > when the slice is mounted rw ? > > Is this a bug ? It's a known feature[1], see geom(4) or try below diff. [1] http://lists.freebsd.org/pipermail/freebsd-fs/2010-April/008290.html %% Index: sys/geom/geom_subr.c === --- sys/geom/geom_subr.c(revision 224657) +++ sys/geom/geom_subr.c(working copy) @@ -807,7 +819,7 @@ g_access(struct g_consumer *cp, int dcr, int dcw, pp, pp->name); /* If foot-shooting is enabled, any open on rank#1 is OK */ - if ((g_debugflags & 16) && pp->geom->rank == 1) + if ((g_debugflags & 16)) ; /* If we try exclusive but already write: fail */ else if (dce > 0 && pw > 0) %% ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"
