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[PATCH 06/12] xfs: make the log ticket ID available outside the log infr

To: xfs@xxxxxxxxxxx
Subject: [PATCH 06/12] xfs: make the log ticket ID available outside the log infrastructure
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Fri, 7 May 2010 15:40:54 +1000
In-reply-to: <1273210860-23414-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1273210860-23414-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

The ticket ID is needed to uniquely identify transactions when doing busy
extent matching. Delayed logging changes the lifecycle of busy extents with
respect to the transaction structure lifecycle. Hence we can no longer use
the transaction structure as a means of determining the owner of the busy
extent as it may be freed and reused while the busy extent is still active.

This commit provides the infrastructure to access the xlog_tid_t held in the
ticket from a transaction handle. This avoids the need for callers to peek
into the transaction and log structures to find this out.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
 fs/xfs/xfs_log.c      |    7 +++++++
 fs/xfs/xfs_log.h      |    7 ++++++-
 fs/xfs/xfs_log_priv.h |    2 --
 3 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 1efb303..19d0c5f 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3312,6 +3312,13 @@ xfs_log_ticket_get(
        return ticket;
 }
 
+xlog_tid_t
+xfs_log_get_trans_ident(
+       struct xfs_trans        *tp)
+{
+       return tp->t_ticket->t_tid;
+}
+
 /*
  * Allocate and initialise a new log ticket.
  */
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 229d1f3..38af110 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -18,8 +18,10 @@
 #ifndef        __XFS_LOG_H__
 #define __XFS_LOG_H__
 
-/* get lsn fields */
+/* transaction ID type */
+typedef __uint32_t xlog_tid_t;
 
+/* get lsn fields */
 #define CYCLE_LSN(lsn) ((uint)((lsn)>>32))
 #define BLOCK_LSN(lsn) ((uint)(lsn))
 
@@ -134,6 +136,7 @@ struct xlog_in_core;
 struct xlog_ticket;
 struct xfs_log_item;
 struct xfs_item_ops;
+struct xfs_trans;
 
 void   xfs_log_item_init(struct xfs_mount      *mp,
                        struct xfs_log_item     *item,
@@ -190,6 +193,8 @@ void          xlog_iodone(struct xfs_buf *);
 struct xlog_ticket * xfs_log_ticket_get(struct xlog_ticket *ticket);
 void     xfs_log_ticket_put(struct xlog_ticket *ticket);
 
+xlog_tid_t xfs_log_get_trans_ident(struct xfs_trans *tp);
+
 #endif
 
 
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 9cf6951..ac97bdd 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -152,8 +152,6 @@ static inline uint xlog_get_client_id(__be32 i)
 #define        XLOG_RECOVERY_NEEDED    0x4     /* log was recovered */
 #define XLOG_IO_ERROR          0x8     /* log hit an I/O error, and being
                                           shutdown */
-typedef __uint32_t xlog_tid_t;
-
 
 #ifdef __KERNEL__
 /*
-- 
1.5.6.5

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