linux-kernel - [PATCH v5 0/3] btrfs: zoned: always set aside a zone for relocation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240524-zoned-gc-v5-0-872907c7cff4@kernel.org>
Date: Fri, 24 May 2024 18:29:08 +0200
From: Johannes Thumshirn <jth@...nel.org>
To: Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, 
 David Sterba <dsterba@...e.com>
Cc: Hans Holmberg <Hans.Holmberg@....com>, linux-btrfs@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Naohiro Aota <naohiro.aota@....com>, 
 Filipe Manana <fdmanana@...e.com>, 
 Johannes Thumshirn <johannes.thumshirn@....com>
Subject: [PATCH v5 0/3] btrfs: zoned: always set aside a zone for
 relocation

For zoned filesytsems we heavily rely on relocation for garbage collecting
as we cannot do any in-place updates of disk blocks.

But there can be situations where we're running out of space for doing the
relocation.

To solve this, always have a zone reserved for relocation.

This is a subset of another approach to this problem I've submitted in
https://lore.kernel.org/r/20240328-hans-v1-0-4cd558959407@kernel.org

---
Changes in v5:
- Split out one patch to skip relocation of the data relocation bg
- Link to v4: https://lore.kernel.org/r/20240523-zoned-gc-v4-0-23ed9f61afa0@kernel.org

Changes in v4:
- Skip data_reloc_bg in delete_unused_bgs() and reclaim_bgs_work()
- Link to v3: https://lore.kernel.org/r/20240521-zoned-gc-v3-0-7db9742454c7@kernel.org

Changes in v3:
- Rename btrfs_reserve_relocation_zone -> btrfs_reserve_relocation_bg
- Bail out if we already have a relocation bg set
- Link to v2: https://lore.kernel.org/r/20240515-zoned-gc-v2-0-20c7cb9763cd@kernel.org

Changes in v2:
- Incorporate Naohiro's review
- Link to v1: https://lore.kernel.org/r/20240514-zoned-gc-v1-0-109f1a6c7447@kernel.org

---
Johannes Thumshirn (3):
      btrfs: don't try to relocate the data relocation block-group
      btrfs: zoned: reserve relocation block-group on mount
      btrfs: reserve new relocation block-group after successful relocation

 fs/btrfs/block-group.c | 11 ++++++++
 fs/btrfs/disk-io.c     |  2 ++
 fs/btrfs/relocation.c  | 14 +++++++++++
 fs/btrfs/volumes.c     |  2 ++
 fs/btrfs/zoned.c       | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/btrfs/zoned.h       |  3 +++
 6 files changed, 100 insertions(+)
---
base-commit: 2aabf192868a0f6d9ee3e35f9b0a8d97c77a46da
change-id: 20240514-zoned-gc-2ce793459eb7

Best regards,
-- 
Johannes Thumshirn <jth@...nel.org>