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  1. Lustre
  2. LU-6824

improve error messages for dir htree limit

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    • Icon: Improvement Improvement
    • Resolution: Fixed
    • Icon: Minor Minor
    • Lustre 2.8.0
    • None
    • 9223372036854775807

      Currently without large dir feature, ldiskfs directory hash tree will be limited 2 height, this means directory size is limited about 1GB, and in fact users are likely to hit ENOSPC when reaching half of limit because of bad hash.

          
LDISKFS-fs warning (device dm-4): ldiskfs_dx_add_entry: Directory (ino: 614516572) index full, reach max htree level :2
LDISKFS-fs warning (device dm-4): ldiskfs_dx_add_entry: Large directory feature is not enabled on this filesystem

      Testing by following scripts:

          
    i=0
    filename="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
    "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabbbbbbbbbbbbbbbbbbbbbbbb"
    while [ 1 ]
    do
            touch $filename"$i"
            if [ $? -ne 0 ];then
                    break
            fi
            ((i++))
    done

      When directory size grow about 590M, we hit ENOSPC. this patch try to improve error messages to warn users when it is easier to hit ENOSPC (50% of limit).

            ys Yang Sheng
            wangshilong Wang Shilong (Inactive)
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              Created:
              Updated:
              Resolved: