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  1. Lustre
  2. LU-13846

move iov iter forward by ourself

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Details

    • Bug
    • Status: Resolved
    • Major
    • Resolution: Fixed
    • None
    • Lustre 2.14.0
    • None
    • 3
    • 9223372036854775807

    Description

      Newer kernel will reward iov iter back to original
      position for direct IO, see following codes:

          
                  iov_iter_revert(from, write_len -iov_iter_count(from));--------->here
          out:
                  return written;
          }
          EXPORT_SYMBOL(generic_file_direct_write);
      

      This break assumptions from Lustre and caused problem
      when Lustre need split one IO to several io loop, considering
      4M block IO for 1 MiB stripe file, it will submit first 1MiB IO
      4 times and caused data corruptions finally.

      Since generic kernel varies from different kernel versions,
      we'd better fix this problem by move iov iter forward by
      Lustre itself.

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              wshilong Wang Shilong (Inactive)
              wshilong Wang Shilong (Inactive)
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              Dates

                Created:
                Updated:
                Resolved: