ocfs2: fix BUG when calculate new backup super

[pandora-kernel.git] / fs / ocfs2 / resize.c

diff --git a/fs/ocfs2/resize.c b/fs/ocfs2/resize.c
index ec55add..2ca64fa 100644 (file)
--- a/fs/ocfs2/resize.c
+++ b/fs/ocfs2/resize.c
@@ -56,11 +56,12 @@ static u16 ocfs2_calc_new_backup_super(struct inode *inode,
                                       int new_clusters,
                                       u32 first_new_cluster,
                                       u16 cl_cpg,
+                                      u16 old_bg_clusters,
                                       int set)
 {
        int i;
        u16 backups = 0;
-       u32 cluster;
+       u32 cluster, lgd_cluster;
        u64 blkno, gd_blkno, lgd_blkno = le64_to_cpu(gd->bg_blkno);
 
        for (i = 0; i < OCFS2_MAX_BACKUP_SUPERBLOCKS; i++) {
@@ -73,6 +74,12 @@ static u16 ocfs2_calc_new_backup_super(struct inode *inode,
                else if (gd_blkno > lgd_blkno)
                        break;
 
+               /* check if already done backup super */
+               lgd_cluster = ocfs2_blocks_to_clusters(inode->i_sb, lgd_blkno);
+               lgd_cluster += old_bg_clusters;
+               if (lgd_cluster >= cluster)
+                       continue;
+
                if (set)
                        ocfs2_set_bit(cluster % cl_cpg,
                                      (unsigned long *)gd->bg_bitmap);
@@ -101,6 +108,7 @@ static int ocfs2_update_last_group_and_inode(handle_t *handle,
        u16 chain, num_bits, backups = 0;
        u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
        u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
+       u16 old_bg_clusters;
 
        trace_ocfs2_update_last_group_and_inode(new_clusters,
                                                first_new_cluster);
@@ -114,6 +122,7 @@ static int ocfs2_update_last_group_and_inode(handle_t *handle,
 
        group = (struct ocfs2_group_desc *)group_bh->b_data;
 
+       old_bg_clusters = le16_to_cpu(group->bg_bits) / cl_bpc;
        /* update the group first. */
        num_bits = new_clusters * cl_bpc;
        le16_add_cpu(&group->bg_bits, num_bits);
@@ -129,7 +138,7 @@ static int ocfs2_update_last_group_and_inode(handle_t *handle,
                                                     group,
                                                     new_clusters,
                                                     first_new_cluster,
-                                                    cl_cpg, 1);
+                                                    cl_cpg, old_bg_clusters, 1);
                le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
        }
 
@@ -169,7 +178,7 @@ out_rollback:
                                            group,
                                            new_clusters,
                                            first_new_cluster,
-                                           cl_cpg, 0);
+                                           cl_cpg, old_bg_clusters, 0);
                le16_add_cpu(&group->bg_free_bits_count, backups);
                le16_add_cpu(&group->bg_bits, -1 * num_bits);
                le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);