+STATIC int
+xlog_cil_lv_item_format(
+ struct xfs_log_item *lip,
+ struct xfs_log_vec *lv)
+{
+ int index;
+ char *ptr;
+
+ /* format new vectors into array */
+ lip->li_ops->iop_format(lip, lv->lv_iovecp);
+
+ /* copy data into existing array */
+ ptr = lv->lv_buf;
+ for (index = 0; index < lv->lv_niovecs; index++) {
+ struct xfs_log_iovec *vec = &lv->lv_iovecp[index];
+
+ memcpy(ptr, vec->i_addr, vec->i_len);
+ vec->i_addr = ptr;
+ ptr += vec->i_len;
+ }
+
+ /*
+ * some size calculations for log vectors over-estimate, so the caller
+ * doesn't know the amount of space actually used by the item. Return
+ * the byte count to the caller so they can check and store it
+ * appropriately.
+ */
+ return ptr - lv->lv_buf;
+}
+
+/*
+ * Prepare the log item for insertion into the CIL. Calculate the difference in
+ * log space and vectors it will consume, and if it is a new item pin it as
+ * well.
+ */
+STATIC void
+xfs_cil_prepare_item(
+ struct xlog *log,
+ struct xfs_log_vec *lv,
+ struct xfs_log_vec *old_lv,
+ int *diff_len,
+ int *diff_iovecs)
+{
+ /* Account for the new LV being passed in */
+ if (lv->lv_buf_len != XFS_LOG_VEC_ORDERED) {
+ *diff_len += lv->lv_buf_len;
+ *diff_iovecs += lv->lv_niovecs;
+ }
+
+ /*
+ * If there is no old LV, this is the first time we've seen the item in
+ * this CIL context and so we need to pin it. If we are replacing the
+ * old_lv, then remove the space it accounts for and free it.
+ */
+ if (!old_lv)
+ lv->lv_item->li_ops->iop_pin(lv->lv_item);
+ else if (old_lv != lv) {
+ ASSERT(lv->lv_buf_len != XFS_LOG_VEC_ORDERED);
+
+ *diff_len -= old_lv->lv_buf_len;
+ *diff_iovecs -= old_lv->lv_niovecs;
+ kmem_free(old_lv);
+ }
+
+ /* attach new log vector to log item */
+ lv->lv_item->li_lv = lv;
+
+ /*
+ * If this is the first time the item is being committed to the
+ * CIL, store the sequence number on the log item so we can
+ * tell in future commits whether this is the first checkpoint
+ * the item is being committed into.
+ */
+ if (!lv->lv_item->li_seq)
+ lv->lv_item->li_seq = log->l_cilp->xc_ctx->sequence;
+}
+