From: David Sterba <dsterba@suse.cz>
To: Naohiro Aota <naohiro.aota@wdc.com>
Cc: Karel Zak <kzak@redhat.com>,
util-linux@vger.kernel.org, linux-btrfs@vger.kernel.org,
linux-fsdevel@vger.kernel.org,
Damien Le Moal <damien.lemoal@wdc.com>,
Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: Re: [PATCH v2 2/3] blkid: add magic and probing for zoned btrfs
Date: Fri, 16 Apr 2021 17:52:41 +0200 [thread overview]
Message-ID: <20210416155241.GY7604@twin.jikos.cz> (raw)
In-Reply-To: <20210414013339.2936229-3-naohiro.aota@wdc.com>
On Wed, Apr 14, 2021 at 10:33:38AM +0900, Naohiro Aota wrote:
> It also supports temporary magic ("!BHRfS_M") in zone #0. The mkfs.btrfs
> first writes the temporary superblock to the zone during the mkfs process.
> It will survive there until the zones are filled up and reset. So, we also
> need to detect this temporary magic.
> + /*
> + * For zoned btrfs, we also need to detect a temporary superblock
> + * at zone #0. Mkfs.btrfs creates it in the initialize process.
> + * It persits until both zones are filled up then reset.
> + */
> + { .magic = "!BHRfS_M", .len = 8, .sboff = 0x40,
> + .is_zoned = 1, .zonenum = 0, .kboff_inzone = 0 },
Should we rather reset the zone twice so the initial superblock does not
have the temporary signature?
For the primary superblock at offset 64K and as a fallback the signature
should be valid for detection purposes (ie. not necessarily to get the
latest superblock).
next prev parent reply other threads:[~2021-04-16 15:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 1:33 [PATCH v2 0/3] implement zone-aware probing/wiping for zoned btrfs Naohiro Aota
2021-04-14 1:33 ` [PATCH v2 1/3] blkid: implement zone-aware probing Naohiro Aota
2021-04-14 9:14 ` Damien Le Moal
2021-04-14 9:17 ` Johannes Thumshirn
2021-04-14 13:31 ` Karel Zak
2021-04-14 15:03 ` Naohiro Aota
2021-04-14 1:33 ` [PATCH v2 2/3] blkid: add magic and probing for zoned btrfs Naohiro Aota
2021-04-14 9:49 ` Johannes Thumshirn
2021-04-14 13:47 ` Karel Zak
2021-04-14 15:08 ` Naohiro Aota
2021-04-16 15:52 ` David Sterba [this message]
2021-04-26 1:38 ` Naohiro Aota
2021-04-14 1:33 ` [PATCH v2 3/3] blkid: support zone reset for wipefs Naohiro Aota
2021-04-14 9:13 ` Damien Le Moal
2021-04-14 9:50 ` Johannes Thumshirn
2021-04-14 13:57 ` Karel Zak
2021-04-16 16:04 ` David Sterba
2021-04-14 14:09 ` [PATCH v2 0/3] implement zone-aware probing/wiping for zoned btrfs Karel Zak
2021-04-14 22:04 ` Damien Le Moal
2021-04-22 14:41 ` Karel Zak
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