From owner-freebsd-fs  Tue Jan 28 21: 4: 8 2003
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Date: Wed, 29 Jan 2003 16:05:56 +1100 (EST)
From: Bruce Evans <bde@zeta.org.au>
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To: Russell Cattelan <cattelan@thebarn.com>
Cc: fs@FreeBSD.ORG
Subject: Re: restricted blocks?
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On 28 Jan 2003, Russell Cattelan wrote:

> Does anybody have quick answer as to why block 1 isn't writable?
>
> naboo[6:24pm]#dd if=/dev/zero of=/dev/da1s1d bs=512 oseek=0 count=1
> 1+0 records in
> 1+0 records out
> 512 bytes transferred in 0.000575 secs (890518 bytes/sec)
> naboo[6:24pm]#dd if=/dev/zero of=/dev/da1s1d bs=512 oseek=1 count=1
> dd: /dev/da1s1d: Operation not permitted
> 1+0 records in
> 0+0 records out
> 0 bytes transferred in 0.000819 secs (0 bytes/sec)
> naboo[6:24pm]#dd if=/dev/zero of=/dev/da1s1d bs=512 oseek=2 count=1
> 1+0 records in
> 1+0 records out
> 512 bytes transferred in 0.000507 secs (1009630 bytes/sec)
>
> XFS uses this location for one of it's meta data block.

Most likely block 1 has a disk label on it.

The errno for this has apparently regressed from EROFS to EPERM.

Bruce


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