write_out_data in JBD

[Zoltan Menyhart]

Stephen,

Here is a code fragment starting at "write_out_data:" in
"journal_commit_transaction()":

Let's assume that there is a single "jh" on the list.

write_out_data:
  while (commit_transaction->t_sync_datalist) {

      jh = commit_transaction->t_sync_datalist;
      commit_transaction->t_sync_datalist = jh->b_tnext;

      // "commit_transaction->t_sync_datalist" happens always
      // to point at our single "jh"

      bh = jh2bh(jh);

      // Assume not locked
      // Assume dirty

      if (buffer_dirty(bh)) {
          get_bh(bh);
          wbuf[bufs++] = bh;
          if (bufs == journal->j_wbufsize) {
              ...
              goto write_out_data;
          }
      } else ...
  }

I think our single "jh" will be put on "wbuf[]" repeatedly
("journal->j_wbufsize" times).

Regards,

Zoltan Menyhart

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