Function textdump_dumpsys

freebsd/ddb/db_textdump.c:430–517

* Commit text dump to disk. */

 * Commit text dump to disk.
 */
void
textdump_dumpsys(struct dumperinfo *di)
{
	struct kerneldumpcrypto *kdc;
	off_t dumplen, trailer_offset;

	if (di->blocksize != TEXTDUMP_BLOCKSIZE) {
		printf("Dump partition block size (%ju) not textdump "
		    "block size (%ju)", (uintmax_t)di->blocksize,
		    (uintmax_t)TEXTDUMP_BLOCKSIZE);
		return;
	}

	/*
	 * We don't know a priori how large the dump will be, but we do know
	 * that we need to reserve space for metadata and that we need two
	 * dump headers.  Also leave room for one ustar header and one block
	 * of data.
	 */
	if (di->mediasize < SIZEOF_METADATA + 2 * sizeof(kdh)) {
		printf("Insufficient space on dump partition for minimal textdump.\n");
		return;
	}
	textdump_error = 0;

	/*
	 * Disable EKCD because we don't provide encrypted textdumps.
	 */
	kdc = di->kdcrypto;
	di->kdcrypto = NULL;

	/*
	 * Position the start of the dump so that we'll write the kernel dump
	 * trailer immediately before the end of the partition, and then work
	 * our way back.  We will rewrite this header later to reflect the
	 * true size if things go well.
	 */
	textdump_offset = di->mediasize - sizeof(kdh);
	textdump_saveoff(&trailer_offset);
	dump_init_header(di, &kdh, TEXTDUMPMAGIC, KERNELDUMP_TEXT_VERSION, 0);
	(void)textdump_writenextblock(di, (char *)&kdh);

	/*
	 * Write a series of files in ustar format.
	 */
	if (textdump_do_ddb)
		db_capture_dump(di);
#ifdef INCLUDE_CONFIG_FILE
	if (textdump_do_config)
		textdump_dump_config(di);
#endif
	if (textdump_do_msgbuf)
		textdump_dump_msgbuf(di);
	if (textdump_do_panic && KERNEL_PANICKED())
		textdump_dump_panic(di);
	if (textdump_do_version)
		textdump_dump_version(di);