Date: Mon, 23 Oct 2000 13:34:43 +0200 (MET DST) From: Martin Machacek <mm@i.cz> To: achilov@granch.ru Cc: questions@FreeBSD.ORG Subject: Re: probably stupid question (mounting BSD/OS filesystem) Message-ID: <XFMail.001023133443.mm@i.cz> In-Reply-To: <39F40E77.354CAF94@sentry.granch.ru>
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On 23-Oct-00 Rashid N. Achilov wrote:
> Isn't BSD/OS 3.1 partition not FFS?
Yes, BSD/OS 3.1 uses FFS as default filesystem but that's not the problem. The
problem is that FreeBSD refuses mount any BSD/OS created partition (that
actually contains FFS filesystem.
Example might help. I have FreeBSD 4.1.1 installed on IDE disk and
BSD/OS 3.1 on SCSI disk. BSD/OS was installed on the disk specifying that
no "real" FDISK table should be used. Let's try to print it from FreeBSD anyway:
martin@mm0:~# fdisk da0
******* Working on device /dev/da0 *******
parameters extracted from in-core disklabel are:
cylinders=1222 heads=64 sectors/track=32 (2048 blks/cyl)
Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=1222 heads=64 sectors/track=32 (2048 blks/cyl)
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 255,(BBT (Bad Blocks Table))
start 4278243231, size 255 (0 Meg), flag 0
beg: cyl 255/ sector 0/ head 0;
end: cyl 0/ sector 0/ head 0
The data for partition 2 is:
sysid 255,(BBT (Bad Blocks Table))
start 520097695, size 8239360 (4023 Meg), flag 93
beg: cyl 255/ sector 0/ head 207;
end: cyl 0/ sector 0/ head 0
The data for partition 3 is:
sysid 114,(unknown)
start 1935810671, size 1634476132 (798084 Meg), flag 0
beg: cyl 357/ sector 36/ head 114;
end: cyl 110/ sector 0/ head 114
The data for partition 4 is:
sysid 0,(unused)
start 0, size 0 (0 Meg), flag 62
beg: cyl 256/ sector 44/ head 101;
end: cyl 0/ sector 0/ head 0
martin@mm0:~#
..and following messages appear on the console:
da0s1: slice starts beyond end of the disk: rejecting it
da0s2: slice starts beyond end of the disk: rejecting it
da0s3: slice starts beyond end of the disk: rejecting it
OK, there is actually no FDISK table, so I get garbage. But there should be some
disklabel because from the BSD/OS view the disk has 3 partitions (using BSD/OS
naming) sd0a (root partition), sd0b (swap), sd0c (whole disk) and sd0h (/usr).
Let's try to read it from FreeBSD:
martin@mm0:~# disklabel -r /dev/rda0
# /dev/rda0:
type: SCSI
disk: QUANTUM FIREBALL
label:
flags:
bytes/sector: 512
sectors/track: 2048
tracks/cylinder: 1
sectors/cylinder: 2048
cylinders: 1223
sectors/unit: 2503872
rpm: 4500
interleave: 1
trackskew: 0
cylinderskew: 0
headswitch: 0 # milliseconds
track-to-track seek: 0 # milliseconds
drivedata: 0
8 partitions:
# size offset fstype [fsize bsize bps/cpg]
a: 131072 0 4.2BSD 1024 8192 16 # (Cyl. 0 - 63)
b: 524288 131072 swap # (Cyl. 64 - 319)
c: 2503872 0 unused 0 0 # (Cyl. 0 - 1222*)
h: 1847296 655360 4.2BSD 1024 8192 16 # (Cyl. 320 - 1221)
martin@mm0:~#
(again "da0s{1,2,3}: slice starts beyond end of the disk: rejecting it" on the
console)
It looks good, doesn't it? Exactly what I've expected (except for the "slice
starts beyond end of the disk" messages). Let's try to mount the 'a' partition
(first readonly):
martin@mm0:~# mount -o ro /dev/da0a /mnt
mount: /dev/da0a on /mnt: incorrect super block
martin@mm0:~#
(again "da0s{1,2,3}: slice starts beyond end of the disk: rejecting it" on the
console)
No luck. Hmm, maybe it should be da0s1a:
martin@mm0:~# mount -o ro /dev/da0s1a /mnt
mount: /dev/da0s1a on /mnt: incorrect super block
martin@mm0:~#
(again "da0s{1,2,3}: slice starts beyond end of the disk: rejecting it" on the
console)
No luck. Whatabout to tell the filesystem type explicitly:
martin@mm0:~# mount -t ufs -o ro /dev/da0s1a /mnt
mount: /dev/da0s1a on /mnt: incorrect super block
martin@mm0:~#
(again "da0s{1,2,3}: slice starts beyond end of the disk: rejecting it" on the
console)
It apears to me that FreeBSD disagrees with BSD/OS on how the superblock should
look like because BSD/OS happily boots and runs from the disk. Or am I missing
something?
Thanks for trying to help,
Martin
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