ReactOS 0.4.15-dev-7942-gd23573b
journal-head.h
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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
13typedef unsigned int tid_t; /* Unique transaction ID */
14typedef struct transaction_s transaction_t; /* Compound transaction type */
15struct buffer_head;
16
18 /*
19 * Points back to our buffer_head. [jbd_lock_bh_journal_head()]
20 */
22
23 /*
24 * Reference count - see description in journal.c
25 * [jbd_lock_bh_journal_head()]
26 */
28
29 /*
30 * Journalling list for this buffer [jbd_lock_bh_state()]
31 */
32 unsigned b_jlist;
33
34 /*
35 * This flag signals the buffer has been modified by
36 * the currently running transaction
37 * [jbd_lock_bh_state()]
38 */
39 unsigned b_modified;
40
41 /*
42 * Copy of the buffer data frozen for writing to the log.
43 * [jbd_lock_bh_state()]
44 */
46
47 /*
48 * Pointer to a saved copy of the buffer containing no uncommitted
49 * deallocation references, so that allocations can avoid overwriting
50 * uncommitted deletes. [jbd_lock_bh_state()]
51 */
53
54 /*
55 * Pointer to the compound transaction which owns this buffer's
56 * metadata: either the running transaction or the committing
57 * transaction (if there is one). Only applies to buffers on a
58 * transaction's data or metadata journaling list.
59 * [j_list_lock] [jbd_lock_bh_state()]
60 */
62
63 /*
64 * Pointer to the running compound transaction which is currently
65 * modifying the buffer's metadata, if there was already a transaction
66 * committing it when the new transaction touched it.
67 * [t_list_lock] [jbd_lock_bh_state()]
68 */
70
71 /*
72 * Doubly-linked list of buffers on a transaction's data, metadata or
73 * forget queue. [t_list_lock] [jbd_lock_bh_state()]
74 */
76
77 /*
78 * Pointer to the compound transaction against which this buffer
79 * is checkpointed. Only dirty buffers can be checkpointed.
80 * [j_list_lock]
81 */
83
84 /*
85 * Doubly-linked list of buffers still remaining to be flushed
86 * before an old transaction can be checkpointed.
87 * [j_list_lock]
88 */
90};
91
92#endif /* JOURNAL_HEAD_H_INCLUDED */
struct transaction_s transaction_t
Definition: journal-head.h:14
unsigned int tid_t
Definition: journal-head.h:13
transaction_t * b_next_transaction
Definition: journal-head.h:69
transaction_t * b_cp_transaction
Definition: journal-head.h:82
transaction_t * b_transaction
Definition: journal-head.h:61
struct journal_head * b_tprev
Definition: journal-head.h:75
unsigned b_modified
Definition: journal-head.h:39
char * b_committed_data
Definition: journal-head.h:52
struct buffer_head * b_bh
Definition: journal-head.h:21
struct journal_head * b_tnext
Definition: journal-head.h:75
unsigned b_jlist
Definition: journal-head.h:32
struct journal_head * b_cpnext
Definition: journal-head.h:89
char * b_frozen_data
Definition: journal-head.h:45
struct journal_head * b_cpprev
Definition: journal-head.h:89