[PATCH v3 1/3] xfsprogs: sync xfs_calc_buf_res() to user space

* [PATCH v3 1/3] xfsprogs: sync xfs_calc_buf_res() to user space
@ 2013-02-19  5:31 Jeff Liu
  2013-02-19 14:59 ` Mark Tinguely
  2013-02-20 20:12 ` Mark Tinguely
  0 siblings, 2 replies; 3+ messages in thread
From: Jeff Liu @ 2013-02-19  5:31 UTC (permalink / raw)
  To: xfs@oss.sgi.com; +Cc: Mark Tinguely

Sync the new helper xfs_calc_buf_res() to user space.

Signed-off-by: Jie Liu <jeff.liu@oracle.com>

---
 libxfs/xfs_trans.c |   29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/libxfs/xfs_trans.c b/libxfs/xfs_trans.c
index 635de8f..d7ff1a9 100644
--- a/libxfs/xfs_trans.c
+++ b/libxfs/xfs_trans.c
@@ -23,6 +23,35 @@ kmem_zone_t	*xfs_trans_zone;
 kmem_zone_t	*xfs_log_item_desc_zone;
 
 /*
+ * A buffer has a format structure overhead in the log in addition
+ * to the data, so we need to take this into account when reserving
+ * space in a transaction for a buffer.  Round the space required up
+ * to a multiple of 128 bytes so that we don't change the historical
+ * reservation that has been used for this overhead.
+ */
+STATIC uint
+xfs_buf_log_overhead(void)
+{
+	return round_up(sizeof(struct xlog_op_header) +
+			sizeof(struct xfs_buf_log_format), 128);
+}
+
+/*
+ * Calculate out transaction log reservation per item in bytes.
+ *
+ * The nbufs argument is used to indicate the number of items that
+ * will be changed in a transaction.  size is used to tell how many
+ * bytes should be reserved per item.
+ */
+STATIC uint
+xfs_calc_buf_res(
+	uint		nbufs,
+	uint		size)
+{
+	return nbufs * (size + xfs_buf_log_overhead());
+}
+
+/*
  * Various log reservation values.
  *
  * These are based on the size of the file system block because that is what
-- 
1.7.9.5

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