patch-2.4.15 linux/include/linux/journal-head.h

• Lines: 71
• Date: Fri Nov 9 14:25:04 2001
• Orig file: v2.4.14/linux/include/linux/journal-head.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.14/linux/include/linux/journal-head.h linux/include/linux/journal-head.h
@@ -0,0 +1,70 @@
+/*
+ * include/linux/journal-head.h
+ *
+ * buffer_head fields for JBD
+ *
+ * 27 May 2001 ANdrew Morton <andrewm@uow.edu.au>
+ *	Created - pulled out of fs.h
+ */
+
+#ifndef JOURNAL_HEAD_H_INCLUDED
+#define JOURNAL_HEAD_H_INCLUDED
+
+typedef unsigned int		tid_t;		/* Unique transaction ID */
+typedef struct transaction_s	transaction_t;	/* Compound transaction type */
+struct buffer_head;
+
+struct journal_head {
+#ifndef CONFIG_JBD_UNIFIED_BUFFERS
+	/* Points back to our buffer_head. */
+	struct buffer_head *b_bh;
+#endif
+
+	/* Reference count - see description in journal.c */
+	int b_jcount;
+
+	/* Journaling list for this buffer */
+	unsigned b_jlist;
+
+	/* Copy of the buffer data frozen for writing to the log. */
+	char * b_frozen_data;
+
+	/* Pointer to a saved copy of the buffer containing no
+           uncommitted deallocation references, so that allocations can
+           avoid overwriting uncommitted deletes. */
+	char * b_committed_data;
+
+	/* Pointer to the compound transaction which owns this buffer's
+           metadata: either the running transaction or the committing
+           transaction (if there is one).  Only applies to buffers on a
+           transaction's data or metadata journaling list. */
+	/* Protected by journal_datalist_lock */
+	transaction_t * b_transaction;
+	
+	/* Pointer to the running compound transaction which is
+           currently modifying the buffer's metadata, if there was
+           already a transaction committing it when the new transaction
+           touched it. */
+	transaction_t * b_next_transaction;
+	
+	/* Doubly-linked list of buffers on a transaction's data,
+           metadata or forget queue. */
+	/* Protected by journal_datalist_lock */
+	struct journal_head *b_tnext, *b_tprev;
+
+	/*
+	 * Pointer to the compound transaction against which this buffer
+	 * is checkpointed.  Only dirty buffers can be checkpointed.
+	 */
+	/* Protected by journal_datalist_lock */
+	transaction_t * b_cp_transaction;
+	
+	/*
+	 * Doubly-linked list of buffers still remaining to be flushed
+	 * before an old transaction can be checkpointed.
+	 */
+	/* Protected by journal_datalist_lock */
+	struct journal_head *b_cpnext, *b_cpprev;
+};
+
+#endif		/* JOURNAL_HEAD_H_INCLUDED */