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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | /* |
| 2 | * include/linux/journal-head.h |
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| 3 | * |
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| 4 | * buffer_head fields for JBD |
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| 5 | * |
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| 6 | * 27 May 2001 Andrew Morton <akpm@digeo.com> |
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| 7 | * Created - pulled out of fs.h |
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| 8 | */ |
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| 9 | |||
| 10 | #ifndef JOURNAL_HEAD_H_INCLUDED |
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| 11 | #define JOURNAL_HEAD_H_INCLUDED |
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| 12 | |||
| 13 | typedef unsigned int tid_t; /* Unique transaction ID */ |
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| 14 | typedef struct transaction_s transaction_t; /* Compound transaction type */ |
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| 15 | struct buffer_head; |
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| 16 | |||
| 17 | struct journal_head { |
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| 18 | /* |
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| 19 | * Points back to our buffer_head. [jbd_lock_bh_journal_head()] |
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| 20 | */ |
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| 21 | struct buffer_head *b_bh; |
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| 22 | |||
| 23 | /* |
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| 24 | * Reference count - see description in journal.c |
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| 25 | * [jbd_lock_bh_journal_head()] |
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| 26 | */ |
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| 27 | int b_jcount; |
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| 28 | |||
| 29 | /* |
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| 30 | * Journalling list for this buffer [jbd_lock_bh_state()] |
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| 31 | */ |
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| 32 | unsigned b_jlist; |
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| 33 | |||
| 34 | /* |
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| 35 | * Copy of the buffer data frozen for writing to the log. |
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| 36 | * [jbd_lock_bh_state()] |
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| 37 | */ |
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| 38 | char *b_frozen_data; |
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| 39 | |||
| 40 | /* |
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| 41 | * Pointer to a saved copy of the buffer containing no uncommitted |
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| 42 | * deallocation references, so that allocations can avoid overwriting |
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| 43 | * uncommitted deletes. [jbd_lock_bh_state()] |
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| 44 | */ |
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| 45 | char *b_committed_data; |
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| 46 | |||
| 47 | /* |
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| 48 | * Pointer to the compound transaction which owns this buffer's |
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| 49 | * metadata: either the running transaction or the committing |
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| 50 | * transaction (if there is one). Only applies to buffers on a |
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| 51 | * transaction's data or metadata journaling list. |
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| 52 | * [j_list_lock] [jbd_lock_bh_state()] |
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| 53 | */ |
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| 54 | transaction_t *b_transaction; |
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| 55 | |||
| 56 | /* |
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| 57 | * Pointer to the running compound transaction which is currently |
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| 58 | * modifying the buffer's metadata, if there was already a transaction |
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| 59 | * committing it when the new transaction touched it. |
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| 60 | * [t_list_lock] [jbd_lock_bh_state()] |
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| 61 | */ |
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| 62 | transaction_t *b_next_transaction; |
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| 63 | |||
| 64 | /* |
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| 65 | * Doubly-linked list of buffers on a transaction's data, metadata or |
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| 66 | * forget queue. [t_list_lock] [jbd_lock_bh_state()] |
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| 67 | */ |
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| 68 | struct journal_head *b_tnext, *b_tprev; |
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| 69 | |||
| 70 | /* |
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| 71 | * Pointer to the compound transaction against which this buffer |
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| 72 | * is checkpointed. Only dirty buffers can be checkpointed. |
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| 73 | * [j_list_lock] |
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| 74 | */ |
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| 75 | transaction_t *b_cp_transaction; |
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| 76 | |||
| 77 | /* |
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| 78 | * Doubly-linked list of buffers still remaining to be flushed |
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| 79 | * before an old transaction can be checkpointed. |
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| 80 | * [j_list_lock] |
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| 81 | */ |
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| 82 | struct journal_head *b_cpnext, *b_cpprev; |
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| 83 | }; |
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| 84 | |||
| 85 | #endif /* JOURNAL_HEAD_H_INCLUDED */ |