* should btrfs reserve some space for root, so a normal user can't cause "no space left" problems?
@ 2021-01-08 7:56
2021-01-08 9:46 ` Andrei Borzenkov
0 siblings, 1 reply; 2+ messages in thread
From: @ 2021-01-08 7:56 UTC (permalink / raw)
To: linux-btrfs
I have done a test where I filled up an entire btrfs raid 1 filesystem as a normal user. Then I simulated a failing drive. it turned out I was unable to replace the drive, as raid1 need free space on both drives. See this mail for details [1]
I can understand the technical reasoning behind the requirement of both drives having some free space. But why does btrfs by default allow a normal, non root user to completely fill up the drive? Maybe it's a good idea to reserve some blocks on the filesystem that are only available for the root user, much like ext4 does that (via tune2fs [-m reserved_blocks_percent] and [-r reserved_blocks_count])
[1] https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg92550.html
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* Re: should btrfs reserve some space for root, so a normal user can't cause "no space left" problems?
2021-01-08 7:56 should btrfs reserve some space for root, so a normal user can't cause "no space left" problems?
@ 2021-01-08 9:46 ` Andrei Borzenkov
0 siblings, 0 replies; 2+ messages in thread
From: Andrei Borzenkov @ 2021-01-08 9:46 UTC (permalink / raw)
To: Cedric.dewijs, linux-btrfs
08.01.2021 10:56, Cedric.dewijs@eclipso.eu пишет:
> I have done a test where I filled up an entire btrfs raid 1 filesystem as a normal user. Then I simulated a failing drive. it turned out I was unable to replace the drive, as raid1 need free space on both drives. See this mail for details [1]
As explained in this mail, you did not "replace" drive, you added new
drive. This is different operation.
>
> I can understand the technical reasoning behind the requirement of both drives having some free space. But why does btrfs by default allow a normal, non root user to completely fill up the drive? Maybe it's a good idea to reserve some blocks on the filesystem that are only available for the root user, much like ext4 does that (via tune2fs [-m reserved_blocks_percent] and [-r reserved_blocks_count])
>
> [1] https://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg92550.html
>
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> Take your mailboxes with you. Free, fast and secure Mail & Cloud: https://www.eclipso.eu - Time to change!
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>
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2021-01-08 7:56 should btrfs reserve some space for root, so a normal user can't cause "no space left" problems?
2021-01-08 9:46 ` Andrei Borzenkov
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