1 files changed, 36 insertions, 0 deletions

diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index a69628603e18..487f00c45f84 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -1618,8 +1618,41 @@ bail:
         return status;
 }
 
+static void ocfs2_init_inode_ac_group(struct inode *dir,
+                                      struct buffer_head *parent_fe_bh,
+                                      struct ocfs2_alloc_context *ac)
+{
+        struct ocfs2_dinode *fe = (struct ocfs2_dinode *)parent_fe_bh->b_data;
+        /*
+         * Try to allocate inodes from some specific group.
+         *
+         * If the parent dir has recorded the last group used in allocation,
+         * cool, use it. Otherwise if we try to allocate new inode from the
+         * same slot the parent dir belongs to, use the same chunk.
+         *
+         * We are very careful here to avoid the mistake of setting
+         * ac_last_group to a group descriptor from a different (unlocked) slot.
+         */
+        if (OCFS2_I(dir)->ip_last_used_group &&
+            OCFS2_I(dir)->ip_last_used_slot == ac->ac_alloc_slot)
+                ac->ac_last_group = OCFS2_I(dir)->ip_last_used_group;
+        else if (le16_to_cpu(fe->i_suballoc_slot) == ac->ac_alloc_slot)
+                ac->ac_last_group = ocfs2_which_suballoc_group(
+                                        le64_to_cpu(fe->i_blkno),
+                                        le16_to_cpu(fe->i_suballoc_bit));
+}
+
+static inline void ocfs2_save_inode_ac_group(struct inode *dir,
+                                             struct ocfs2_alloc_context *ac)
+{
+        OCFS2_I(dir)->ip_last_used_group = ac->ac_last_group;
+        OCFS2_I(dir)->ip_last_used_slot = ac->ac_alloc_slot;
+}
+
 int ocfs2_claim_new_inode(struct ocfs2_super *osb,
                           handle_t *handle,
+                          struct inode *dir,
+                          struct buffer_head *parent_fe_bh,
                           struct ocfs2_alloc_context *ac,
                           u16 *suballoc_bit,
                           u64 *fe_blkno)
@@ -1635,6 +1668,8 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
         BUG_ON(ac->ac_bits_wanted != 1);
         BUG_ON(ac->ac_which != OCFS2_AC_USE_INODE);
 
+        ocfs2_init_inode_ac_group(dir, parent_fe_bh, ac);
+
         status = ocfs2_claim_suballoc_bits(osb,
                                            ac,
                                            handle,
@@ -1653,6 +1688,7 @@ int ocfs2_claim_new_inode(struct ocfs2_super *osb,
 
         *fe_blkno = bg_blkno + (u64) (*suballoc_bit);
         ac->ac_bits_given++;
+        ocfs2_save_inode_ac_group(dir, ac);
         status = 0;
 bail:
         mlog_exit(status);