[XFS] This fix prevents bulkstat from spinning in an infinite loop.

Here 'agino' increments through the inodes in an allocation group. At the
end of the innermost 'for' loop it will hold the value of the next inode
to look at (ie the first inode in the next cluster/chunk). Assigning
'lastino' to 'agino' resets it to the last inode in the last inode cluster
we just looked at. This causes us to look up the very same cluster and
examine all the inodes all over again, and again, and again...

We also want to set 'lastino' for the cases when we're not interested in
the inode so that the next call to bulkstat won't re-examine the same
uninteresting inodes.

SGI-PV: 971064
SGI-Modid: xfs-linux-melb:xfs-kern:29840a
Signed-off-by: NLachlan McIlroy <lachlan@sgi.com>
Signed-off-by: NDavid Chinner <dgc@sgi.com>
Signed-off-by: NTim Shimmin <tes@sgi.com>

fs/xfs/xfs_itable.c

@@ -619,21 +619,25 @@ xfs_bulkstat(
 						}
 					}
 				}
+				ino = XFS_AGINO_TO_INO(mp, agno, agino);
+				bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 				/*
 				 * Skip if this inode is free.
 				 */
-				if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free)
+				if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
+					lastino = ino;
 					continue;
+				}
 				/*
 				 * Count used inodes as free so we can tell
 				 * when the chunk is used up.
 				 */
 				irbp->ir_freecount++;
-				ino = XFS_AGINO_TO_INO(mp, agno, agino);
-				bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 				if (!xfs_bulkstat_use_dinode(mp, flags, bp,
-							     clustidx, &dip))
+							     clustidx, &dip)) {
+					lastino = ino;
 					continue;
+				}
 				/*
 				 * If we need to do an iget, cannot hold bp.
 				 * Drop it, until starting the next cluster.
@@ -694,8 +698,7 @@ xfs_bulkstat(
 			if (end_of_ag) {
 				agno++;
 				agino = 0;
-			} else
-				agino = XFS_INO_TO_AGINO(mp, lastino);
+			}
 		} else
 			break;
 	}