1 files changed, 29 insertions, 15 deletions

diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index 5a146cb22980..a64dfbd565a5 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -107,6 +107,16 @@ xfs_ialloc_log_di(
 /*
  * Allocation group level functions.
  */
+static inline int
+xfs_ialloc_cluster_alignment(
+        xfs_alloc_arg_t *args)
+{
+        if (xfs_sb_version_hasalign(&args->mp->m_sb) &&
+            args->mp->m_sb.sb_inoalignmt >=
+             XFS_B_TO_FSBT(args->mp, XFS_INODE_CLUSTER_SIZE(args->mp)))
+                return args->mp->m_sb.sb_inoalignmt;
+        return 1;
+}
 
 /*
  * Allocate new inodes in the allocation group specified by agbp.
@@ -167,10 +177,24 @@ xfs_ialloc_ag_alloc(
                 args.mod = args.total = args.wasdel = args.isfl =
                         args.userdata = args.minalignslop = 0;
                 args.prod = 1;
-                args.alignment = 1;
+
                 /*
-                 * Allow space for the inode btree to split.
+                 * We need to take into account alignment here to ensure that
+                 * we don't modify the free list if we fail to have an exact
+                 * block. If we don't have an exact match, and every oher
+                 * attempt allocation attempt fails, we'll end up cancelling
+                 * a dirty transaction and shutting down.
+                 *
+                 * For an exact allocation, alignment must be 1,
+                 * however we need to take cluster alignment into account when
+                 * fixing up the freelist. Use the minalignslop field to
+                 * indicate that extra blocks might be required for alignment,
+                 * but not to use them in the actual exact allocation.
                  */
+                args.alignment = 1;
+                args.minalignslop = xfs_ialloc_cluster_alignment(&args) - 1;
+
+                /* Allow space for the inode btree to split. */
                 args.minleft = XFS_IN_MAXLEVELS(args.mp) - 1;
                 if ((error = xfs_alloc_vextent(&args)))
                         return error;
@@ -191,13 +215,8 @@ xfs_ialloc_ag_alloc(
                         ASSERT(!(args.mp->m_flags & XFS_MOUNT_NOALIGN));
                         args.alignment = args.mp->m_dalign;
                         isaligned = 1;
-                } else if (xfs_sb_version_hasalign(&args.mp->m_sb) &&
-                           args.mp->m_sb.sb_inoalignmt >=
-                           XFS_B_TO_FSBT(args.mp,
-                                XFS_INODE_CLUSTER_SIZE(args.mp)))
-                                args.alignment = args.mp->m_sb.sb_inoalignmt;
-                else
-                        args.alignment = 1;
+                } else
+                        args.alignment = xfs_ialloc_cluster_alignment(&args);
                 /*
                  * Need to figure out where to allocate the inode blocks.
                  * Ideally they should be spaced out through the a.g.
@@ -230,12 +249,7 @@ xfs_ialloc_ag_alloc(
                 args.agbno = be32_to_cpu(agi->agi_root);
                 args.fsbno = XFS_AGB_TO_FSB(args.mp,
                                 be32_to_cpu(agi->agi_seqno), args.agbno);
-                if (xfs_sb_version_hasalign(&args.mp->m_sb) &&
-                        args.mp->m_sb.sb_inoalignmt >=
-                        XFS_B_TO_FSBT(args.mp, XFS_INODE_CLUSTER_SIZE(args.mp)))
-                                args.alignment = args.mp->m_sb.sb_inoalignmt;
-                else
-                        args.alignment = 1;
+                args.alignment = xfs_ialloc_cluster_alignment(&args);
                 if ((error = xfs_alloc_vextent(&args)))
                         return error;
         }