xfs: add the xlog_grant_head structure

Add a new data structure to allow sharing code between the log grant and
regrant code.

Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 12 insertions, 11 deletions

diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index d8c5e47bbc2f..eba4ec925a45 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -470,6 +470,16 @@ struct xfs_cil {
 #define XLOG_CIL_HARD_SPACE_LIMIT(log)  (3 * (log->l_logsize >> 4))
 
 /*
+ * ticket grant locks, queues and accounting have their own cachlines
+ * as these are quite hot and can be operated on concurrently.
+ */
+struct xlog_grant_head {
+        spinlock_t              lock ____cacheline_aligned_in_smp;
+        struct list_head        waiters;
+        atomic64_t              grant;
+};
+
+/*
  * The reservation head lsn is not made up of a cycle number and block number.
  * Instead, it uses a cycle number and byte number.  Logs don't expect to
  * overflow 31 bits worth of byte offset, so using a byte number will mean
@@ -520,17 +530,8 @@ typedef struct log {
         /* lsn of 1st LR with unflushed * buffers */
         atomic64_t              l_tail_lsn ____cacheline_aligned_in_smp;
 
-        /*
-         * ticket grant locks, queues and accounting have their own cachlines
-         * as these are quite hot and can be operated on concurrently.
-         */
-        spinlock_t              l_grant_reserve_lock ____cacheline_aligned_in_smp;
-        struct list_head        l_reserveq;
-        atomic64_t              l_grant_reserve_head;
-
-        spinlock_t              l_grant_write_lock ____cacheline_aligned_in_smp;
-        struct list_head        l_writeq;
-        atomic64_t              l_grant_write_head;
+        struct xlog_grant_head  l_reserve_head;
+        struct xlog_grant_head  l_write_head;
 
         /* The following field are used for debugging; need to hold icloglock */
 #ifdef DEBUG