On Jan 12, 2007 03:18 +0300, Alex Tomas wrote:
> +/*
> + * the routine checks that every block start with key value specified
> + * in the pointed at the upper layer
> + */
> +static int __ext4_ext_check_interlevel(const char *function, struct inode
> *inode,
> + struct ext4_ext_path *path, int depth)
> +{
> + unsigned long key, first;
> +
> + if (ext_depth(inode) == 0)
> + return 0;
> +
> + /* nothing to check at the top */
> + if (depth == ext_depth(inode))
> + return 0;
> +
> + /* after split, a leaf can get zero entries
> + * thus there is nothing to check */
> + if (le16_to_cpu(path->p_hdr->eh_entries) == 0)
> + return 0;
> +
> + if (depth == 0)
> + first = le32_to_cpu(EXT_FIRST_EXTENT(path->p_hdr)->ee_block);
> + else
> + first = le32_to_cpu(EXT_FIRST_INDEX(path->p_hdr)->ei_block);
> + path--;
> + key = le32_to_cpu(path->p_idx->ei_block);
> +
> + if (likely(first == key))
> + return 0;
What happens if, say, a leaf is split and then the first part of the split
is removed? This could only happen with punch() on a running filesystem,
but in e2fsck a corrupt extent will be removed from the leaf without
updating the parent index's range.
Cheers, Andreas
--
Andreas Dilger
Principal Software Engineer
Cluster File Systems, Inc.
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