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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/journal-head.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/linux/journal-head.h')
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1 files changed, 92 insertions, 0 deletions
diff --git a/include/linux/journal-head.h b/include/linux/journal-head.h
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+/*
+ * include/linux/journal-head.h
+ *
+ * buffer_head fields for JBD
+ *
+ * 27 May 2001 Andrew Morton <akpm@digeo.com>
+ * 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 {
+ /*
+ * Points back to our buffer_head. [jbd_lock_bh_journal_head()]
+ */
+ struct buffer_head *b_bh;
+
+ /*
+ * Reference count - see description in journal.c
+ * [jbd_lock_bh_journal_head()]
+ */
+ int b_jcount;
+
+ /*
+ * Journalling list for this buffer [jbd_lock_bh_state()]
+ */
+ unsigned b_jlist;
+
+ /*
+ * This flag signals the buffer has been modified by
+ * the currently running transaction
+ * [jbd_lock_bh_state()]
+ */
+ unsigned b_modified;
+
+ /*
+ * Copy of the buffer data frozen for writing to the log.
+ * [jbd_lock_bh_state()]
+ */
+ 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. [jbd_lock_bh_state()]
+ */
+ 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.
+ * [j_list_lock] [jbd_lock_bh_state()]
+ */
+ 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.
+ * [t_list_lock] [jbd_lock_bh_state()]
+ */
+ transaction_t *b_next_transaction;
+
+ /*
+ * Doubly-linked list of buffers on a transaction's data, metadata or
+ * forget queue. [t_list_lock] [jbd_lock_bh_state()]
+ */
+ struct journal_head *b_tnext, *b_tprev;
+
+ /*
+ * Pointer to the compound transaction against which this buffer
+ * is checkpointed. Only dirty buffers can be checkpointed.
+ * [j_list_lock]
+ */
+ transaction_t *b_cp_transaction;
+
+ /*
+ * Doubly-linked list of buffers still remaining to be flushed
+ * before an old transaction can be checkpointed.
+ * [j_list_lock]
+ */
+ struct journal_head *b_cpnext, *b_cpprev;
+};
+
+#endif /* JOURNAL_HEAD_H_INCLUDED */