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[2a03:2880:3ff:3::face:b00c]) by smtp.gmail.com with ESMTPSA id 5614622812f47-3e393587330sm2717480b6e.19.2024.09.30.15.24.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Sep 2024 15:24:51 -0700 (PDT) From: Leo Martins To: linux-btrfs@vger.kernel.org, kernel-team@fb.com Subject: [PATCH v2 0/2] btrfs-progs: mkfs free-space-info bug Date: Mon, 30 Sep 2024 15:23:10 -0700 Message-ID: X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Currently mkfs creates a few block-groups to bootstrap the filesystem. Along with these block-groups some free-space-infos are created. When the block-group cleanup happens the block-groups are deleted and the free-space-infos are not. This patch set introduces a fix that deletes the free-space-infos when the block-groups are deleted. When implementing a test for my changes I found that there was already some code in free-space-tree.c that attempts to verify that all free-space-infos correspond to a block-group. This code only checks if there exists a block-group that has an objectid >= free-space-info's objectid. I added an additional check to make sure that the block-group actually matches the free-space-info's objectid and offset. Making this change to fsck will cause all filesystems that were created using mkfs.btrfs to warn that there is some free-space-info that doesn't correspond to a block-group. This seems like a bad idea, I considered adding to the message to signify that this is not a big issue and maybe point them to this patchset to get the fix. Open to ideas on how to handle this. Leo Martins (2): btrfs-progs: delete free space when deleting block group btrfs-progs: check free space maps to block group common/clear-cache.c | 3 ++- kernel-shared/extent-tree.c | 10 ++++++++++ kernel-shared/free-space-tree.c | 3 +++ 3 files changed, 15 insertions(+), 1 deletion(-)