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From: Marek Behun <marek.behun@nic.cz>
To: linux-btrfs@vger.kernel.org
Subject: when does btrfs create sparse extents?
Date: Wed, 22 Apr 2020 20:52:09 +0200	[thread overview]
Message-ID: <20200422205209.0e2efd53@nic.cz> (raw)

Hello,

there was a bug fixed recently in U-Boot's btrfs driver - the driver
failed to read files with sparse extents. This causes that sometimes
device failes to boot Linux, since the kernel fails to load from
storage.

So when does kernel's btrfs driver write sparse extents? Is it always
when it finds a PAGE_SIZEd and aligned all-zeros block? Or is it more
complicated?

Thanks.

Marek

             reply	other threads:[~2020-04-22 18:52 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-22 18:52 Marek Behun [this message]
2020-04-22 20:26 ` when does btrfs create sparse extents? Chris Murphy
2020-04-22 20:44   ` Marek Behun
2020-04-22 20:44   ` Chris Murphy
2020-04-22 20:58     ` Marek Behun
2020-04-22 21:05       ` Chris Murphy
2020-04-23 10:49       ` Filipe Manana
2020-04-23 11:42         ` Marek Behun
2020-04-23 11:51           ` Filipe Manana
2020-04-23 12:05             ` Marek Behun
2020-04-23 12:39               ` Filipe Manana
2020-04-23 19:50                 ` Chris Murphy
2020-04-23  5:57 ` Andrei Borzenkov
2020-04-23  6:45   ` Marek Behun

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