ext4: calculate and verify checksums for inode bitmaps

[pandora-kernel.git] / fs / ext4 / resize.c

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index e037475..7810cac 100644 (file)
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -1069,6 +1069,47 @@ static int ext4_add_new_descs(handle_t *handle, struct super_block *sb,
        return err;
 }
 
+static struct buffer_head *ext4_get_bitmap(struct super_block *sb, __u64 block)
+{
+       struct buffer_head *bh = sb_getblk(sb, block);
+       if (!bh)
+               return NULL;
+
+       if (bitmap_uptodate(bh))
+               return bh;
+
+       lock_buffer(bh);
+       if (bh_submit_read(bh) < 0) {
+               unlock_buffer(bh);
+               brelse(bh);
+               return NULL;
+       }
+       unlock_buffer(bh);
+
+       return bh;
+}
+
+static int ext4_set_bitmap_checksums(struct super_block *sb,
+                                    ext4_group_t group,
+                                    struct ext4_group_desc *gdp,
+                                    struct ext4_new_group_data *group_data)
+{
+       struct buffer_head *bh;
+
+       if (!EXT4_HAS_RO_COMPAT_FEATURE(sb,
+                                       EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+               return 0;
+
+       bh = ext4_get_bitmap(sb, group_data->inode_bitmap);
+       if (!bh)
+               return -EIO;
+       ext4_inode_bitmap_csum_set(sb, group, gdp, bh,
+                                  EXT4_INODES_PER_GROUP(sb) / 8);
+       brelse(bh);
+
+       return 0;
+}
+
 /*
  * ext4_setup_new_descs() will set up the group descriptor descriptors of a flex bg
  */
@@ -1101,6 +1142,12 @@ static int ext4_setup_new_descs(handle_t *handle, struct super_block *sb,
                memset(gdp, 0, EXT4_DESC_SIZE(sb));
                ext4_block_bitmap_set(sb, gdp, group_data->block_bitmap);
                ext4_inode_bitmap_set(sb, gdp, group_data->inode_bitmap);
+               err = ext4_set_bitmap_checksums(sb, group, gdp, group_data);
+               if (err) {
+                       ext4_std_error(sb, err);
+                       break;
+               }
+
                ext4_inode_table_set(sb, gdp, group_data->inode_table);
                ext4_free_group_clusters_set(sb, gdp,
                                             EXT4_B2C(sbi, group_data->free_blocks_count));