xfs: Ensure we force all busy extents in range to disk
[linux-2.6.git] / fs / xfs / xfs_alloc.c
index a1c65fc..275b1f4 100644 (file)
@@ -2563,43 +2563,41 @@ xfs_alloc_search_busy(xfs_trans_t *tp,
        xfs_mount_t             *mp;
        xfs_perag_busy_t        *bsy;
        xfs_agblock_t           uend, bend;
-       xfs_lsn_t               lsn;
+       xfs_lsn_t               lsn = 0;
        int                     cnt;
 
        mp = tp->t_mountp;
 
        spin_lock(&mp->m_perag[agno].pagb_lock);
-       cnt = mp->m_perag[agno].pagb_count;
 
        uend = bno + len - 1;
 
-       /* search pagb_list for this slot, skipping open slots */
-       for (bsy = mp->m_perag[agno].pagb_list; cnt; bsy++) {
+       /*
+        * search pagb_list for this slot, skipping open slots. We have to
+        * search the entire array as there may be multiple overlaps and
+        * we have to get the most recent LSN for the log force to push out
+        * all the transactions that span the range.
+        */
+       for (cnt = 0; cnt < mp->m_perag[agno].pagb_count; cnt++) {
+               bsy = &mp->m_perag[agno].pagb_list[cnt];
+               if (!bsy->busy_tp)
+                       continue;
 
-               /*
-                * (start1,length1) within (start2, length2)
-                */
-               if (bsy->busy_tp != NULL) {
-                       bend = bsy->busy_start + bsy->busy_length - 1;
-                       if ((bno > bend) || (uend < bsy->busy_start)) {
-                               cnt--;
-                       } else {
-                               break;
-                       }
-               }
-       }
+               bend = bsy->busy_start + bsy->busy_length - 1;
+               if (bno > bend || uend < bsy->busy_start)
+                       continue;
 
-       trace_xfs_alloc_busysearch(mp, agno, bno, len, !!cnt);
+               /* (start1,length1) within (start2, length2) */
+               if (XFS_LSN_CMP(bsy->busy_tp->t_commit_lsn, lsn) > 0)
+                       lsn = bsy->busy_tp->t_commit_lsn;
+       }
+       spin_unlock(&mp->m_perag[agno].pagb_lock);
+       trace_xfs_alloc_busysearch(tp->t_mountp, agno, bno, len, lsn);
 
        /*
         * If a block was found, force the log through the LSN of the
         * transaction that freed the block
         */
-       if (cnt) {
-               lsn = bsy->busy_tp->t_commit_lsn;
-               spin_unlock(&mp->m_perag[agno].pagb_lock);
+       if (lsn)
                xfs_log_force(mp, lsn, XFS_LOG_FORCE|XFS_LOG_SYNC);
-       } else {
-               spin_unlock(&mp->m_perag[agno].pagb_lock);
-       }
 }