static int
vhd_journal_add_journal_header(vhd_journal_t *j)
{
int err;
off64_t off;
vhd_context_t *vhd;
vhd = &j->vhd;
memset(&j->header, 0, sizeof(vhd_journal_header_t));
err = vhd_seek(vhd, 0, SEEK_END);
if (err)
return err;
off = vhd_position(vhd);
if (off == (off64_t)-1)
return -errno;
err = vhd_get_footer(vhd);
if (err)
return err;
uuid_copy(j->header.uuid, vhd->footer.uuid);
memcpy(j->header.cookie,
VHD_JOURNAL_HEADER_COOKIE, sizeof(j->header.cookie));
j->header.vhd_footer_offset = off - sizeof(vhd_footer_t);
j->header.journal_eof = sizeof(vhd_journal_header_t);
return vhd_journal_write_header(j, &j->header);
}
static int
vhd_journal_update(vhd_journal_t *j, off_t offset,
char *buf, size_t size, uint32_t type)
{
int err;
off_t eof;
uint64_t *off, off_bak;
uint32_t *entries;
vhd_journal_entry_t entry;
entry.type = type;
entry.size = size;
entry.offset = offset;
entry.cookie = VHD_JOURNAL_ENTRY_COOKIE;
entry.checksum = vhd_journal_checksum_entry(&entry, buf, size);
err = vhd_journal_seek(j, j->header.journal_eof, SEEK_SET);
if (err)
return err;
err = vhd_journal_write_entry(j, &entry);
if (err)
goto fail;
err = vhd_journal_write(j, buf, size);
if (err)
goto fail;
if (type == VHD_JOURNAL_ENTRY_TYPE_DATA) {
off = &j->header.journal_data_offset;
entries = &j->header.journal_data_entries;
} else {
off = &j->header.journal_metadata_offset;
entries = &j->header.journal_metadata_entries;
}
off_bak = *off;
if (!(*entries)++)
*off = j->header.journal_eof;
j->header.journal_eof += (size + sizeof(vhd_journal_entry_t));
err = vhd_journal_write_header(j, &j->header);
if (err) {
if (!--(*entries))
*off = off_bak;
j->header.journal_eof -= (size + sizeof(vhd_journal_entry_t));
goto fail;
}
return 0;
fail:
if (!j->is_block)
vhd_journal_truncate(j, j->header.journal_eof);
return err;
}
/*
* commit indicates the transaction completed
* successfully and we can remove the undo log
*/
int
vhd_journal_commit(vhd_journal_t *j)
{
int err;
j->header.journal_data_entries = 0;
j->header.journal_metadata_entries = 0;
j->header.journal_data_offset = 0;
j->header.journal_metadata_offset = 0;
err = vhd_journal_write_header(j, &j->header);
if (err)
return err;
if (!j->is_block)
err = vhd_journal_truncate(j, sizeof(vhd_journal_header_t));
if (err)
return -errno;
return 0;
}
static int
vhd_journal_add_metadata(vhd_journal_t *j)
{
int err;
off_t eof;
vhd_context_t *vhd;
vhd = &j->vhd;
err = vhd_journal_add_footer(j);
if (err)
return err;
if (!vhd_type_dynamic(vhd))
return 0;
err = vhd_journal_add_header(j);
if (err)
return err;
err = vhd_journal_add_locators(j);
if (err)
return err;
err = vhd_journal_add_bat(j);
if (err)
return err;
if (vhd_has_batmap(vhd)) {
err = vhd_journal_add_batmap(j);
if (err)
return err;
}
j->header.journal_data_offset = j->header.journal_eof;
return vhd_journal_write_header(j, &j->header);
}
