static void dump_path(const char *tag, struct ext2_extent_handle *handle,
struct extent_path *path)
{
struct extent_path *ppp = path;
printf("%s: level=%d\n", tag, handle->level);
do {
printf("%s: path=%ld buf=%p entries=%d max_entries=%d left=%d "
"visit_num=%d flags=0x%x end_blk=%llu curr=%p(%ld)\n",
tag, (ppp - handle->path), ppp->buf, ppp->entries,
ppp->max_entries, ppp->left, ppp->visit_num, ppp->flags,
ppp->end_blk, ppp->curr, ppp->curr - (void *)ppp->buf);
printf(" ");
dbg_show_header((struct ext3_extent_header *)ppp->buf);
if (ppp->curr) {
printf(" ");
dbg_show_index(ppp->curr);
printf(" ");
dbg_show_extent(ppp->curr);
}
ppp--;
} while (ppp >= handle->path);
fflush(stdout);
return;
}
errcode_t ext2fs_extent_header_verify(void *ptr, int size)
{
int eh_max, entry_size;
struct ext3_extent_header *eh = ptr;
dbg_show_header(eh);
if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC)
return EXT2_ET_EXTENT_HEADER_BAD;
if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max))
return EXT2_ET_EXTENT_HEADER_BAD;
if (eh->eh_depth == 0)
entry_size = sizeof(struct ext3_extent);
else
entry_size = sizeof(struct ext3_extent_idx);
eh_max = (size - sizeof(*eh)) / entry_size;
if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) ||
(ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2)))
return EXT2_ET_EXTENT_HEADER_BAD;
return 0;
}
/*
* Verify the extent header as being sane
*/
errcode_t ext2fs_extent_header_verify(void *ptr, int size)
{
int eh_max, entry_size;
struct ext3_extent_header *eh = ptr;
dbg_show_header(eh);
if (ext2fs_le16_to_cpu(eh->eh_magic) != EXT3_EXT_MAGIC)
return EXT2_ET_EXTENT_HEADER_BAD;
if (ext2fs_le16_to_cpu(eh->eh_entries) > ext2fs_le16_to_cpu(eh->eh_max))
return EXT2_ET_EXTENT_HEADER_BAD;
if (eh->eh_depth == 0)
entry_size = sizeof(struct ext3_extent);
else
entry_size = sizeof(struct ext3_extent_idx);
eh_max = (size - sizeof(*eh)) / entry_size;
/* Allow two extent-sized items at the end of the block, for
* ext4_extent_tail with checksum in the future. */
if ((ext2fs_le16_to_cpu(eh->eh_max) > eh_max) ||
(ext2fs_le16_to_cpu(eh->eh_max) < (eh_max - 2)))
return EXT2_ET_EXTENT_HEADER_BAD;
return 0;
}