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C/C++ Source or Header  |  2005-10-13  |  2KB  |  86 lines
  1. /*
  2.  * include/linux/journal-head.h
  3.  *
  4.  * buffer_head fields for JBD
  5.  *
  6.  * 27 May 2001 Andrew Morton <akpm@digeo.com>
  7.  *    Created - pulled out of fs.h
  8.  */
  9.  
  10. #ifndef JOURNAL_HEAD_H_INCLUDED
  11. #define JOURNAL_HEAD_H_INCLUDED
  12.  
  13. typedef unsigned int        tid_t;        /* Unique transaction ID */
  14. typedef struct transaction_s    transaction_t;    /* Compound transaction type */
  15. struct buffer_head;
  16.  
  17. struct journal_head {
  18.     /*
  19.      * Points back to our buffer_head. [jbd_lock_bh_journal_head()]
  20.      */
  21.     struct buffer_head *b_bh;
  22.  
  23.     /*
  24.      * Reference count - see description in journal.c
  25.      * [jbd_lock_bh_journal_head()]
  26.      */
  27.     int b_jcount;
  28.  
  29.     /*
  30.      * Journalling list for this buffer [jbd_lock_bh_state()]
  31.      */
  32.     unsigned b_jlist;
  33.  
  34.     /*
  35.      * Copy of the buffer data frozen for writing to the log.
  36.      * [jbd_lock_bh_state()]
  37.      */
  38.     char *b_frozen_data;
  39.  
  40.     /*
  41.      * Pointer to a saved copy of the buffer containing no uncommitted
  42.      * deallocation references, so that allocations can avoid overwriting
  43.      * uncommitted deletes. [jbd_lock_bh_state()]
  44.      */
  45.     char *b_committed_data;
  46.  
  47.     /*
  48.      * Pointer to the compound transaction which owns this buffer's
  49.      * metadata: either the running transaction or the committing
  50.      * transaction (if there is one).  Only applies to buffers on a
  51.      * transaction's data or metadata journaling list.
  52.      * [j_list_lock] [jbd_lock_bh_state()]
  53.      */
  54.     transaction_t *b_transaction;
  55.  
  56.     /*
  57.      * Pointer to the running compound transaction which is currently
  58.      * modifying the buffer's metadata, if there was already a transaction
  59.      * committing it when the new transaction touched it.
  60.      * [t_list_lock] [jbd_lock_bh_state()]
  61.      */
  62.     transaction_t *b_next_transaction;
  63.  
  64.     /*
  65.      * Doubly-linked list of buffers on a transaction's data, metadata or
  66.      * forget queue. [t_list_lock] [jbd_lock_bh_state()]
  67.      */
  68.     struct journal_head *b_tnext, *b_tprev;
  69.  
  70.     /*
  71.      * Pointer to the compound transaction against which this buffer
  72.      * is checkpointed.  Only dirty buffers can be checkpointed.
  73.      * [j_list_lock]
  74.      */
  75.     transaction_t *b_cp_transaction;
  76.  
  77.     /*
  78.      * Doubly-linked list of buffers still remaining to be flushed
  79.      * before an old transaction can be checkpointed.
  80.      * [j_list_lock]
  81.      */
  82.     struct journal_head *b_cpnext, *b_cpprev;
  83. };
  84.  
  85. #endif        /* JOURNAL_HEAD_H_INCLUDED */
  86.