ref: 3e1d0ec133eb36e703aad6243cf31aaadef57570
parent: b6fafb2a2ce5207d032594a80ce3cdd33bcc34b6
author: ngkaho1234 <ngkaho1234@gmail.com>
date: Wed Oct 28 14:14:36 EDT 2015
METADATA_CSUM: inode bitmap verification added
--- a/lwext4/ext4_ialloc.c
+++ b/lwext4/ext4_ialloc.c
@@ -129,6 +129,34 @@
}
+#if CONFIG_META_CSUM_ENABLE
+static bool
+ext4_ialloc_verify_bitmap_csum(struct ext4_sblock *sb,
+ struct ext4_bgroup *bg,
+ void *bitmap __unused)
+{+
+ if (!ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM))
+ return true;
+
+ int desc_size = ext4_sb_get_desc_size(sb);
+ uint32_t checksum = ext4_ialloc_bitmap_csum(sb, bitmap);
+ uint16_t lo_checksum = to_le16(checksum & 0xFFFF),
+ hi_checksum = to_le16(checksum >> 16);
+
+ if (bg->inode_bitmap_csum_lo != lo_checksum)
+ return false;
+
+ if (desc_size == EXT4_MAX_BLOCK_GROUP_DESCRIPTOR_SIZE)
+ if (bg->inode_bitmap_csum_hi != hi_checksum)
+ return false;
+
+ return true;
+}
+#else
+#define ext4_balloc_verify_bitmap_csum(...) true
+#endif
+
int ext4_ialloc_free_inode(struct ext4_fs *fs, uint32_t index, bool is_dir)
{struct ext4_sblock *sb = &fs->sb;
@@ -150,6 +178,15 @@
if (rc != EOK)
return rc;
+ if (!ext4_ialloc_verify_bitmap_csum(sb,
+ bg_ref.block_group,
+ bitmap_block.data)) {+ ext4_dbg(DEBUG_IALLOC,
+ DBG_WARN "Bitmap checksum failed."
+ "Group: %" PRIu32"\n",
+ bg_ref.index);
+ }
+
/* Free i-node in the bitmap */
uint32_t index_in_group = ext4_ialloc_inode2index_in_group(sb, index);
ext4_bmap_bit_clr(bitmap_block.data, index_in_group);
@@ -240,6 +277,15 @@
if (rc != EOK) {ext4_fs_put_block_group_ref(&bg_ref);
return rc;
+ }
+
+ if (!ext4_ialloc_verify_bitmap_csum(sb,
+ bg_ref.block_group,
+ bitmap_block.data)) {+ ext4_dbg(DEBUG_IALLOC,
+ DBG_WARN "Bitmap checksum failed."
+ "Group: %" PRIu32"\n",
+ bg_ref.index);
}
/* Try to allocate i-node in the bitmap */