+ /*
+ * We obtain and lock the backing buffer first in the process
+ * here, as we have to ensure that any dirty inode that we
+ * can't get the flush lock on is attached to the buffer.
+ * If we scan the in-memory inodes first, then buffer IO can
+ * complete before we get a lock on it, and hence we may fail
+ * to mark all the active inodes on the buffer stale.
+ */
+ bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
+ mp->m_bsize * blks_per_cluster,
+ XBF_LOCK);
+
+ /*
+ * Walk the inodes already attached to the buffer and mark them
+ * stale. These will all have the flush locks held, so an
+ * in-memory inode walk can't lock them.
+ */
+ lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
+ while (lip) {
+ if (lip->li_type == XFS_LI_INODE) {
+ iip = (xfs_inode_log_item_t *)lip;
+ ASSERT(iip->ili_logged == 1);
+ lip->li_cb = (void(*)(xfs_buf_t*,xfs_log_item_t*)) xfs_istale_done;
+ xfs_trans_ail_copy_lsn(mp->m_ail,
+ &iip->ili_flush_lsn,
+ &iip->ili_item.li_lsn);
+ xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
+ found++;
+ }
+ lip = lip->li_bio_list;
+ }