From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/include/linux/journal-head.h | 106 ++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 kernel/include/linux/journal-head.h (limited to 'kernel/include/linux/journal-head.h') diff --git a/kernel/include/linux/journal-head.h b/kernel/include/linux/journal-head.h new file mode 100644 index 000000000..98cd41bb3 --- /dev/null +++ b/kernel/include/linux/journal-head.h @@ -0,0 +1,106 @@ +/* + * include/linux/journal-head.h + * + * buffer_head fields for JBD + * + * 27 May 2001 Andrew Morton + * 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()] + * NOTE: We *cannot* combine this with b_modified into a bitfield + * as gcc would then (which the C standard allows but which is + * very unuseful) make 64-bit accesses to the bitfield and clobber + * b_jcount if its update races with bitfield modification. + */ + 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()] + * Either of these locks is enough for reading, both are needed for + * changes. + */ + 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; + + /* Trigger type */ + struct jbd2_buffer_trigger_type *b_triggers; + + /* Trigger type for the committing transaction's frozen data */ + struct jbd2_buffer_trigger_type *b_frozen_triggers; +}; + +#endif /* JOURNAL_HEAD_H_INCLUDED */ -- cgit 1.2.3-korg