summaryrefslogtreecommitdiff
path: root/fs/xfs/xfs_log_priv.h
diff options
context:
space:
mode:
Diffstat (limited to 'fs/xfs/xfs_log_priv.h')
-rw-r--r--fs/xfs/xfs_log_priv.h37
1 files changed, 31 insertions, 6 deletions
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 958f356df10e..d34af1c21ed2 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -53,7 +53,6 @@ struct xfs_mount;
BTOBB(XLOG_MAX_ICLOGS << (xfs_sb_version_haslogv2(&log->l_mp->m_sb) ? \
XLOG_MAX_RECORD_BSHIFT : XLOG_BIG_RECORD_BSHIFT))
-
static inline xfs_lsn_t xlog_assign_lsn(uint cycle, uint block)
{
return ((xfs_lsn_t)cycle << 32) | block;
@@ -505,8 +504,6 @@ typedef struct log {
* log entries" */
xlog_in_core_t *l_iclog; /* head log queue */
spinlock_t l_icloglock; /* grab to change iclog state */
- xfs_lsn_t l_tail_lsn; /* lsn of 1st LR with unflushed
- * buffers */
int l_curr_cycle; /* Cycle number of log writes */
int l_prev_cycle; /* Cycle number before last
* block increment */
@@ -521,12 +518,15 @@ typedef struct log {
int64_t l_grant_write_head;
/*
- * l_last_sync_lsn is an atomic so it can be set and read without
- * needing to hold specific locks. To avoid operations contending with
- * other hot objects, place it on a separate cacheline.
+ * l_last_sync_lsn and l_tail_lsn are atomics so they can be set and
+ * read without needing to hold specific locks. To avoid operations
+ * contending with other hot objects, place each of them on a separate
+ * cacheline.
*/
/* lsn of last LR on disk */
atomic64_t l_last_sync_lsn ____cacheline_aligned_in_smp;
+ /* lsn of 1st LR with unflushed * buffers */
+ atomic64_t l_tail_lsn ____cacheline_aligned_in_smp;
/* The following field are used for debugging; need to hold icloglock */
#ifdef DEBUG
@@ -566,6 +566,31 @@ int xlog_write(struct log *log, struct xfs_log_vec *log_vector,
xlog_in_core_t **commit_iclog, uint flags);
/*
+ * When we crack an atomic LSN, we sample it first so that the value will not
+ * change while we are cracking it into the component values. This means we
+ * will always get consistent component values to work from. This should always
+ * be used to smaple and crack LSNs taht are stored and updated in atomic
+ * variables.
+ */
+static inline void
+xlog_crack_atomic_lsn(atomic64_t *lsn, uint *cycle, uint *block)
+{
+ xfs_lsn_t val = atomic64_read(lsn);
+
+ *cycle = CYCLE_LSN(val);
+ *block = BLOCK_LSN(val);
+}
+
+/*
+ * Calculate and assign a value to an atomic LSN variable from component pieces.
+ */
+static inline void
+xlog_assign_atomic_lsn(atomic64_t *lsn, uint cycle, uint block)
+{
+ atomic64_set(lsn, xlog_assign_lsn(cycle, block));
+}
+
+/*
* When we crack the grrant head, we sample it first so that the value will not
* change while we are cracking it into the component values. This means we
* will always get consistent component values to work from.