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commitae4477f937upstream. Each superblock contains a copy of the device item for that device. In a transaction which drops a chunk but doesn't create any new ones, we were correctly updating the device item in the chunk tree but not copying over the new bytes_used value to the superblock. This can be seen by doing the following: # dd if=/dev/zero of=test bs=4096 count=2621440 # mkfs.btrfs test # mount test /root/temp # cd /root/temp # for i in {00..10}; do dd if=/dev/zero of=$i bs=4096 count=32768; done # sync # rm * # sync # btrfs balance start -dusage=0 . # sync # cd # umount /root/temp # btrfs check test For btrfs-check to detect this, you will also need my patch at https://github.com/kdave/btrfs-progs/pull/991. Change btrfs_remove_dev_extents() so that it adds the devices to the fs_info->post_commit_list if they're not there already. This causes btrfs_commit_device_sizes() to be called, which updates the bytes_used value in the superblock. Fixes:bbbf7243d6("btrfs: combine device update operations during transaction commit") CC: stable@vger.kernel.org # 5.10+ Reviewed-by: Qu Wenruo <wqu@suse.com> Signed-off-by: Mark Harmstone <maharmstone@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
8246 lines
222 KiB
8246 lines
222 KiB