ext4: calculate and verify checksums for inode bitmaps

Compute and verify the checksum of the inode bitmap; the checkum is
stored in the block group descriptor.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 47 insertions, 0 deletions

diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index e0374757a94b..7810cac241e1 100644
--- 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));