[fio.git] / verify.c

/*
 * IO verification helpers
 */
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <assert.h>

#include "fio.h"

#include "crc/md5.h"
#include "crc/crc64.h"
#include "crc/crc32.h"
#include "crc/crc16.h"
#include "crc/crc7.h"
#include "crc/sha256.h"
#include "crc/sha512.h"

static void fill_random_bytes(struct thread_data *td, void *p, unsigned int len)
{
	unsigned int todo;
	int r;

	while (len) {
		r = os_random_long(&td->verify_state);

		/*
		 * lrand48_r seems to be broken and only fill the bottom
		 * 32-bits, even on 64-bit archs with 64-bit longs
		 */
		todo = sizeof(r);
		if (todo > len)
			todo = len;

		memcpy(p, &r, todo);

		len -= todo;
		p += todo;
	}
}

static void fill_pattern(struct thread_data *td, void *p, unsigned int len)
{
	switch (td->o.verify_pattern_bytes) {
	case 0:
		dprint(FD_VERIFY, "fill random bytes len=%u\n", len);
		fill_random_bytes(td, p, len);
		break;
	case 1:
		dprint(FD_VERIFY, "fill verify pattern b=0 len=%u\n", len);
		memset(p, td->o.verify_pattern, len);
		break;
	case 2:
	case 3:
	case 4: {
		unsigned int pattern = td->o.verify_pattern;
		unsigned int i = 0;
		unsigned char c1, c2, c3, c4;
		unsigned char *b = p;

		dprint(FD_VERIFY, "fill verify pattern b=%d len=%u\n",
					td->o.verify_pattern_bytes, len);

		c1 = pattern & 0xff;
		pattern >>= 8;
		c2 = pattern & 0xff;
		pattern >>= 8;
		c3 = pattern & 0xff;
		pattern >>= 8;
		c4 = pattern & 0xff;

		while (i < len) {
			b[i++] = c1;
			if (i == len)
				break;
			b[i++] = c2;
			if (td->o.verify_pattern_bytes == 2 || i == len)
				continue;
			b[i++] = c3;
			if (td->o.verify_pattern_bytes == 3 || i == len)
				continue;
			b[i++] = c4;
		}
		break;
		}
	}
}

static void memswp(void *buf1, void *buf2, unsigned int len)
{
	char swap[200];

	assert(len <= sizeof(swap));

	memcpy(&swap, buf1, len);
	memcpy(buf1, buf2, len);
	memcpy(buf2, &swap, len);
}

static void hexdump(void *buffer, int len)
{
	unsigned char *p = buffer;
	int i;

	for (i = 0; i < len; i++)
		log_info("%02x", p[i]);
	log_info("\n");
}

/*
 * Prepare for seperation of verify_header and checksum header
 */
static inline unsigned int __hdr_size(int verify_type)
{
	unsigned int len;

	switch (verify_type) {
	case VERIFY_NONE:
	case VERIFY_NULL:
		len = 0;
		break;
	case VERIFY_MD5:
		len = sizeof(struct vhdr_md5);
		break;
	case VERIFY_CRC64:
		len = sizeof(struct vhdr_crc64);
		break;
	case VERIFY_CRC32:
		len = sizeof(struct vhdr_crc32);
		break;
	case VERIFY_CRC16:
		len = sizeof(struct vhdr_crc16);
		break;
	case VERIFY_CRC7:
		len = sizeof(struct vhdr_crc7);
		break;
	case VERIFY_SHA256:
		len = sizeof(struct vhdr_sha256);
		break;
	case VERIFY_SHA512:
		len = sizeof(struct vhdr_sha512);
		break;
	case VERIFY_META:
		len = sizeof(struct vhdr_meta);
		break;
	default:
		log_err("fio: unknown verify header!\n");
		assert(0);
	}

	return len + sizeof(struct verify_header);
}

static inline unsigned int hdr_size(struct verify_header *hdr)
{
	return __hdr_size(hdr->verify_type);
}

static void *hdr_priv(struct verify_header *hdr)
{
	void *priv = hdr;

	return priv + sizeof(struct verify_header);
}

/*
 * Return data area 'header_num'
 */
static inline void *io_u_verify_off(struct verify_header *hdr,
				    struct io_u *io_u,
				    unsigned char header_num)
{
	return io_u->buf + header_num * hdr->len + hdr_size(hdr);
}

static int verify_io_u_meta(struct verify_header *hdr, struct thread_data *td,
                            struct io_u *io_u, unsigned int header_num)
{
	struct vhdr_meta *vh = hdr_priv(hdr);

	dprint(FD_VERIFY, "meta verify io_u %p, len %u\n", io_u, hdr->len);

	if (vh->offset != io_u->offset + header_num * td->o.verify_interval) {
		log_err("meta: verify failed at %llu/%u\n",
		              io_u->offset + header_num * hdr->len,
		              hdr->len);
		return EIO;
	}

	return 0;
}

static int verify_io_u_sha512(struct verify_header *hdr, struct io_u *io_u,
			      unsigned int header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_sha512 *vh = hdr_priv(hdr);
	uint8_t sha512[128];
	struct sha512_ctx sha512_ctx = {
		.buf = sha512,
	};

	dprint(FD_VERIFY, "sha512 verify io_u %p, len %u\n", io_u, hdr->len);

	sha512_init(&sha512_ctx);
	sha512_update(&sha512_ctx, p, hdr->len - hdr_size(hdr));

	if (memcmp(vh->sha512, sha512_ctx.buf, sizeof(sha512))) {
		log_err("sha512: verify failed at %llu/%u\n",
		              io_u->offset + header_num * hdr->len,
		              hdr->len);
		hexdump(vh->sha512, sizeof(vh->sha512));
		hexdump(sha512_ctx.buf, sizeof(sha512));
		return EIO;
	}

	return 0;
}

static int verify_io_u_sha256(struct verify_header *hdr, struct io_u *io_u,
			      unsigned int header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_sha256 *vh = hdr_priv(hdr);
	uint8_t sha256[128];
	struct sha256_ctx sha256_ctx = {
		.buf = sha256,
	};

	dprint(FD_VERIFY, "sha256 verify io_u %p, len %u\n", io_u, hdr->len);

	sha256_init(&sha256_ctx);
	sha256_update(&sha256_ctx, p, hdr->len - hdr_size(hdr));

	if (memcmp(vh->sha256, sha256_ctx.buf, sizeof(sha256))) {
		log_err("sha256: verify failed at %llu/%u\n",
		              io_u->offset + header_num * hdr->len,
		              hdr->len);
		hexdump(vh->sha256, sizeof(vh->sha256));
		hexdump(sha256_ctx.buf, sizeof(sha256));
		return EIO;
	}

	return 0;
}

static int verify_io_u_crc7(struct verify_header *hdr, struct io_u *io_u,
                            unsigned char header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_crc7 *vh = hdr_priv(hdr);
	unsigned char c;

	dprint(FD_VERIFY, "crc7 verify io_u %p, len %u\n", io_u, hdr->len);

	c = crc7(p, hdr->len - hdr_size(hdr));

	if (c != vh->crc7) {
		log_err("crc7: verify failed at %llu/%u\n",
		                io_u->offset + header_num * hdr->len,
				hdr->len);
		log_err("crc7: wanted %x, got %x\n", vh->crc7, c);
		return EIO;
	}

	return 0;
}

static int verify_io_u_crc16(struct verify_header *hdr, struct io_u *io_u,
                             unsigned int header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_crc16 *vh = hdr_priv(hdr);
	unsigned short c;

	dprint(FD_VERIFY, "crc16 verify io_u %p, len %u\n", io_u, hdr->len);

	c = crc16(p, hdr->len - hdr_size(hdr));

	if (c != vh->crc16) {
		log_err("crc16: verify failed at %llu/%u\n",
		                io_u->offset + header_num * hdr->len,
				hdr->len);
		log_err("crc16: wanted %x, got %x\n", vh->crc16, c);
		return EIO;
	}

	return 0;
}

static int verify_io_u_crc64(struct verify_header *hdr, struct io_u *io_u,
                             unsigned int header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_crc64 *vh = hdr_priv(hdr);
	unsigned long long c;

	dprint(FD_VERIFY, "crc64 verify io_u %p, len %u\n", io_u, hdr->len);

	c = crc64(p, hdr->len - hdr_size(hdr));

	if (c != vh->crc64) {
		log_err("crc64: verify failed at %llu/%u\n",
				io_u->offset + header_num * hdr->len,
				hdr->len);
		log_err("crc64: wanted %llx, got %llx\n", (unsigned long long) vh->crc64, c);
		return EIO;
	}

	return 0;
}

static int verify_io_u_crc32(struct verify_header *hdr, struct io_u *io_u,
		             unsigned int header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_crc32 *vh = hdr_priv(hdr);
	uint32_t c;

	dprint(FD_VERIFY, "crc32 verify io_u %p, len %u\n", io_u, hdr->len);

	c = crc32(p, hdr->len - hdr_size(hdr));

	if (c != vh->crc32) {
		log_err("crc32: verify failed at %llu/%u\n",
		                io_u->offset + header_num * hdr->len,
				hdr->len);
		log_err("crc32: wanted %x, got %x\n", vh->crc32, c);
		return EIO;
	}

	return 0;
}

static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u,
		           unsigned int header_num)
{
	void *p = io_u_verify_off(hdr, io_u, header_num);
	struct vhdr_md5 *vh = hdr_priv(hdr);
	uint32_t hash[MD5_HASH_WORDS];
	struct md5_ctx md5_ctx = {
		.hash = hash,
	};

	dprint(FD_VERIFY, "md5 verify io_u %p, len %u\n", io_u, hdr->len);

	md5_init(&md5_ctx);
	md5_update(&md5_ctx, p, hdr->len - hdr_size(hdr));

	if (memcmp(vh->md5_digest, md5_ctx.hash, sizeof(hash))) {
		log_err("md5: verify failed at %llu/%u\n",
		              io_u->offset + header_num * hdr->len,
		              hdr->len);
		hexdump(vh->md5_digest, sizeof(vh->md5_digest));
		hexdump(md5_ctx.hash, sizeof(hash));
		return EIO;
	}

	return 0;
}

static unsigned int hweight8(unsigned int w)
{
	unsigned int res = w - ((w >> 1) & 0x55);

	res = (res & 0x33) + ((res >> 2) & 0x33);
	return (res + (res >> 4)) & 0x0F;
}

int verify_io_u_pattern(unsigned long pattern, unsigned long pattern_size,
                        char *buf, unsigned int len, unsigned int mod)
{
	unsigned int i;
	char split_pattern[4];

	for (i = 0; i < 4; i++) {
		split_pattern[i] = pattern & 0xff;
		pattern >>= 8;
	}

	for (i = 0; i < len; i++) {
		if (buf[i] != split_pattern[mod]) {
			unsigned int bits;

			bits = hweight8(buf[i] ^ split_pattern[mod]);
			log_err("fio: got pattern %x, wanted %x. Bad bits %d\n",
				buf[i], split_pattern[mod], bits);
			log_err("fio: bad pattern block offset %u\n", i);
			return EIO;
		}
		mod++;
		if (mod == pattern_size)
			mod = 0;
	}

	return 0;
}

int verify_io_u(struct thread_data *td, struct io_u *io_u)
{
	struct verify_header *hdr;
	unsigned int hdr_size, hdr_inc, hdr_num = 0;
	void *p;
	int ret;

	if (td->o.verify == VERIFY_NULL || io_u->ddir != DDIR_READ)
		return 0;

	hdr_inc = io_u->buflen;
	if (td->o.verify_interval)
		hdr_inc = td->o.verify_interval;

	ret = 0;
	for (p = io_u->buf; p < io_u->buf + io_u->buflen; p += hdr_inc, hdr_num++) {
		if (ret && td->o.verify_fatal) {
			td->terminate = 1;
			break;
		}
		hdr_size = __hdr_size(td->o.verify);
		if (td->o.verify_offset)
			memswp(p, p + td->o.verify_offset, hdr_size);
		hdr = p;

		if (hdr->fio_magic != FIO_HDR_MAGIC) {
			log_err("Bad verify header %x\n", hdr->fio_magic);
			return EIO;
		}

		if (td->o.verify_pattern_bytes) {
			dprint(FD_VERIFY, "pattern verify io_u %p, len %u\n",
								io_u, hdr->len);
			ret = verify_io_u_pattern(td->o.verify_pattern,
			                          td->o.verify_pattern_bytes,
			                          p + hdr_size,
			                          hdr_inc - hdr_size,
			                          hdr_size % 4);
			if (ret)
				log_err("fio: verify failed at %llu/%u\n",
					io_u->offset + hdr_num * hdr->len,
					hdr->len);
			continue;
		}

		switch (hdr->verify_type) {
		case VERIFY_MD5:
			ret = verify_io_u_md5(hdr, io_u, hdr_num);
			break;
		case VERIFY_CRC64:
			ret = verify_io_u_crc64(hdr, io_u, hdr_num);
			break;
		case VERIFY_CRC32:
			ret = verify_io_u_crc32(hdr, io_u, hdr_num);
			break;
		case VERIFY_CRC16:
			ret = verify_io_u_crc16(hdr, io_u, hdr_num);
			break;
		case VERIFY_CRC7:
			ret = verify_io_u_crc7(hdr, io_u, hdr_num);
			break;
		case VERIFY_SHA256:
			ret = verify_io_u_sha256(hdr, io_u, hdr_num);
			break;
		case VERIFY_SHA512:
			ret = verify_io_u_sha512(hdr, io_u, hdr_num);
			break;
		case VERIFY_META:
			ret = verify_io_u_meta(hdr, td, io_u, hdr_num);
			break;
		default:
			log_err("Bad verify type %u\n", hdr->verify_type);
			ret = EINVAL;
		}
	}

	return ret;
}

static void fill_meta(struct verify_header *hdr, struct thread_data *td,
                      struct io_u *io_u, unsigned int header_num)
{
	struct vhdr_meta *vh = hdr_priv(hdr);

	vh->thread = td->thread_number;

	vh->time_sec = io_u->start_time.tv_sec;
	vh->time_usec = io_u->start_time.tv_usec;

	vh->numberio = td->io_issues[DDIR_WRITE];

	vh->offset = io_u->offset + header_num * td->o.verify_interval;
}

static void fill_sha512(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_sha512 *vh = hdr_priv(hdr);
	struct sha512_ctx sha512_ctx = {
		.buf = vh->sha512,
	};

	sha512_init(&sha512_ctx);
	sha512_update(&sha512_ctx, p, len);
}

static void fill_sha256(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_sha256 *vh = hdr_priv(hdr);
	struct sha256_ctx sha256_ctx = {
		.buf = vh->sha256,
	};

	sha256_init(&sha256_ctx);
	sha256_update(&sha256_ctx, p, len);
}

static void fill_crc7(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_crc7 *vh = hdr_priv(hdr);

	vh->crc7 = crc7(p, len);
}

static void fill_crc16(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_crc16 *vh = hdr_priv(hdr);

	vh->crc16 = crc16(p, len);
}

static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_crc32 *vh = hdr_priv(hdr);

	vh->crc32 = crc32(p, len);
}

static void fill_crc64(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_crc64 *vh = hdr_priv(hdr);

	vh->crc64 = crc64(p, len);
}

static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
{
	struct vhdr_md5 *vh = hdr_priv(hdr);
	struct md5_ctx md5_ctx = {
		.hash = (uint32_t *) vh->md5_digest,
	};

	md5_init(&md5_ctx);
	md5_update(&md5_ctx, p, len);
}

/*
 * fill body of io_u->buf with random data and add a header with the
 * crc32 or md5 sum of that data.
 */
void populate_verify_io_u(struct thread_data *td, struct io_u *io_u)
{
	struct verify_header *hdr;
	void *p = io_u->buf, *data;
	unsigned int hdr_inc, data_len, header_num = 0;

	if (td->o.verify == VERIFY_NULL)
		return;

	fill_pattern(td, p, io_u->buflen);

	hdr_inc = io_u->buflen;
	if (td->o.verify_interval)
		hdr_inc = td->o.verify_interval;

	for (;p < io_u->buf + io_u->buflen; p += hdr_inc) {
		hdr = p;

		hdr->fio_magic = FIO_HDR_MAGIC;
		hdr->verify_type = td->o.verify;
		hdr->len = hdr_inc;
		data_len = hdr_inc - hdr_size(hdr);

		data = p + hdr_size(hdr);
		switch (td->o.verify) {
		case VERIFY_MD5:
			dprint(FD_VERIFY, "fill md5 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_md5(hdr, data, data_len);
			break;
		case VERIFY_CRC64:
			dprint(FD_VERIFY, "fill crc64 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_crc64(hdr, data, data_len);
			break;
		case VERIFY_CRC32:
			dprint(FD_VERIFY, "fill crc32 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_crc32(hdr, data, data_len);
			break;
		case VERIFY_CRC16:
			dprint(FD_VERIFY, "fill crc16 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_crc16(hdr, data, data_len);
			break;
		case VERIFY_CRC7:
			dprint(FD_VERIFY, "fill crc7 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_crc7(hdr, data, data_len);
			break;
		case VERIFY_SHA256:
			dprint(FD_VERIFY, "fill sha256 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_sha256(hdr, data, data_len);
			break;
		case VERIFY_SHA512:
			dprint(FD_VERIFY, "fill sha512 io_u %p, len %u\n",
							io_u, hdr->len);
			fill_sha512(hdr, data, data_len);
			break;
		case VERIFY_META:
			dprint(FD_VERIFY, "fill meta io_u %p, len %u\n",
							io_u, hdr->len);
			fill_meta(hdr, td, io_u, header_num);
			break;
		default:
			log_err("fio: bad verify type: %d\n", td->o.verify);
			assert(0);
		}
		if (td->o.verify_offset)
			memswp(p, p + td->o.verify_offset, hdr_size(hdr));
		header_num++;
	}
}

int get_next_verify(struct thread_data *td, struct io_u *io_u)
{
	struct io_piece *ipo = NULL;

	/*
	 * this io_u is from a requeue, we already filled the offsets
	 */
	if (io_u->file)
		return 0;

	if (!RB_EMPTY_ROOT(&td->io_hist_tree)) {
		struct rb_node *n = rb_first(&td->io_hist_tree);

		ipo = rb_entry(n, struct io_piece, rb_node);
		rb_erase(n, &td->io_hist_tree);
	} else if (!list_empty(&td->io_hist_list)) {
		ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
		list_del(&ipo->list);
	}

	if (ipo) {
		io_u->offset = ipo->offset;
		io_u->buflen = ipo->len;
		io_u->file = ipo->file;

		if ((io_u->file->flags & FIO_FILE_OPEN) == 0) {
			int r = td_io_open_file(td, io_u->file);

			if (r) {
				dprint(FD_VERIFY, "failed file %s open\n",
						io_u->file->file_name);
				return 1;
			}
		}

		get_file(ipo->file);
		assert(io_u->file->flags & FIO_FILE_OPEN);
		io_u->ddir = DDIR_READ;
		io_u->xfer_buf = io_u->buf;
		io_u->xfer_buflen = io_u->buflen;
		free(ipo);
		dprint(FD_VERIFY, "get_next_verify: ret io_u %p\n", io_u);
		return 0;
	}

	dprint(FD_VERIFY, "get_next_verify: empty\n");
	return 1;
}
Commit	Line	Data
e29d1b70 JA	1	/*
	2	* IO verification helpers
	3	*/
	4	#include <unistd.h>
	5	#include <fcntl.h>
	6	#include <string.h>
97af62ce	7	#include <assert.h>
e29d1b70 JA	8
e29d1b70 JA	9	#include "fio.h"
e29d1b70	10
eef6eea1 JA	11	#include "crc/md5.h"
	12	#include "crc/crc64.h"
	13	#include "crc/crc32.h"
	14	#include "crc/crc16.h"
	15	#include "crc/crc7.h"
	16	#include "crc/sha256.h"
	17	#include "crc/sha512.h"
cd14cc10	18
90059d65	19	static void fill_random_bytes(struct thread_data td, void p, unsigned int len)
e29d1b70 JA	20	{
e29d1b70 JA	21	unsigned int todo;
4c5946c6	22	int r;
e29d1b70 JA	23
e29d1b70 JA	24	while (len) {
4c5946c6	25	r = os_random_long(&td->verify_state);
e29d1b70 JA	26
	27	/*
	28	* lrand48_r seems to be broken and only fill the bottom
	29	* 32-bits, even on 64-bit archs with 64-bit longs
	30	*/
	31	todo = sizeof(r);
	32	if (todo > len)
	33	todo = len;
	34
	35	memcpy(p, &r, todo);
	36
	37	len -= todo;
	38	p += todo;
	39	}
	40	}
	41
90059d65 JA	42	static void fill_pattern(struct thread_data td, void p, unsigned int len)
	43	{
	44	switch (td->o.verify_pattern_bytes) {
	45	case 0:
bd6f78b2	46	dprint(FD_VERIFY, "fill random bytes len=%u\n", len);
90059d65 JA	47	fill_random_bytes(td, p, len);
	48	break;
	49	case 1:
bd6f78b2	50	dprint(FD_VERIFY, "fill verify pattern b=0 len=%u\n", len);
90059d65 JA	51	memset(p, td->o.verify_pattern, len);
	52	break;
	53	case 2:
	54	case 3:
	55	case 4: {
	56	unsigned int pattern = td->o.verify_pattern;
	57	unsigned int i = 0;
	58	unsigned char c1, c2, c3, c4;
	59	unsigned char *b = p;
	60
bd6f78b2 JA	61	dprint(FD_VERIFY, "fill verify pattern b=%d len=%u\n",
	62	td->o.verify_pattern_bytes, len);
	63
90059d65 JA	64	c1 = pattern & 0xff;
	65	pattern >>= 8;
	66	c2 = pattern & 0xff;
	67	pattern >>= 8;
	68	c3 = pattern & 0xff;
	69	pattern >>= 8;
	70	c4 = pattern & 0xff;
	71
	72	while (i < len) {
	73	b[i++] = c1;
	74	if (i == len)
	75	break;
	76	b[i++] = c2;
	77	if (td->o.verify_pattern_bytes == 2 \|\| i == len)
	78	continue;
	79	b[i++] = c3;
	80	if (td->o.verify_pattern_bytes == 3 \|\| i == len)
	81	continue;
	82	b[i++] = c4;
	83	}
	84	break;
	85	}
	86	}
	87	}
	88
4764aec9	89	static void memswp(void buf1, void buf2, unsigned int len)
546a9142	90	{
dee6de74 SL	91	char swap[200];
	92
	93	assert(len <= sizeof(swap));
90059d65	94
546a9142 SL	95	memcpy(&swap, buf1, len);
	96	memcpy(buf1, buf2, len);
	97	memcpy(buf2, &swap, len);
	98	}
	99
e29d1b70 JA	100	static void hexdump(void *buffer, int len)
	101	{
	102	unsigned char *p = buffer;
	103	int i;
	104
	105	for (i = 0; i < len; i++)
6d86144d JA	106	log_info("%02x", p[i]);
6d86144d JA	107	log_info("\n");
e29d1b70 JA	108	}
e29d1b70 JA	109
87677832 JA	110	/*
	111	* Prepare for seperation of verify_header and checksum header
	112	*/
546dfd9f	113	static inline unsigned int __hdr_size(int verify_type)
87677832	114	{
546dfd9f	115	unsigned int len;
87677832	116
546dfd9f JA	117	switch (verify_type) {
	118	case VERIFY_NONE:
	119	case VERIFY_NULL:
	120	len = 0;
	121	break;
	122	case VERIFY_MD5:
	123	len = sizeof(struct vhdr_md5);
	124	break;
	125	case VERIFY_CRC64:
	126	len = sizeof(struct vhdr_crc64);
	127	break;
	128	case VERIFY_CRC32:
	129	len = sizeof(struct vhdr_crc32);
	130	break;
	131	case VERIFY_CRC16:
	132	len = sizeof(struct vhdr_crc16);
	133	break;
	134	case VERIFY_CRC7:
	135	len = sizeof(struct vhdr_crc7);
	136	break;
	137	case VERIFY_SHA256:
	138	len = sizeof(struct vhdr_sha256);
	139	break;
	140	case VERIFY_SHA512:
	141	len = sizeof(struct vhdr_sha512);
	142	break;
7437ee87 SL	143	case VERIFY_META:
	144	len = sizeof(struct vhdr_meta);
	145	break;
546dfd9f JA	146	default:
	147	log_err("fio: unknown verify header!\n");
	148	assert(0);
	149	}
	150
	151	return len + sizeof(struct verify_header);
87677832 JA	152	}
	153
	154	static inline unsigned int hdr_size(struct verify_header *hdr)
	155	{
546dfd9f JA	156	return __hdr_size(hdr->verify_type);
	157	}
	158
	159	static void hdr_priv(struct verify_header hdr)
	160	{
	161	void *priv = hdr;
	162
	163	return priv + sizeof(struct verify_header);
87677832 JA	164	}
87677832 JA	165
d9f2caf3 JA	166	/*
	167	* Return data area 'header_num'
	168	*/
	169	static inline void io_u_verify_off(struct verify_header hdr,
	170	struct io_u *io_u,
	171	unsigned char header_num)
	172	{
87677832	173	return io_u->buf + header_num * hdr->len + hdr_size(hdr);
d9f2caf3 JA	174	}
d9f2caf3 JA	175
7437ee87 SL	176	static int verify_io_u_meta(struct verify_header hdr, struct thread_data td,
	177	struct io_u *io_u, unsigned int header_num)
	178	{
	179	struct vhdr_meta *vh = hdr_priv(hdr);
	180
bd6f78b2 JA	181	dprint(FD_VERIFY, "meta verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	182
7437ee87 SL	183	if (vh->offset != io_u->offset + header_num * td->o.verify_interval) {
	184	log_err("meta: verify failed at %llu/%u\n",
	185	io_u->offset + header_num * hdr->len,
	186	hdr->len);
d16d4e09	187	return EIO;
7437ee87 SL	188	}
	189
	190	return 0;
	191	}
	192
cd14cc10 JA	193	static int verify_io_u_sha512(struct verify_header hdr, struct io_u io_u,
	194	unsigned int header_num)
	195	{
	196	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f	197	struct vhdr_sha512 *vh = hdr_priv(hdr);
cd14cc10 JA	198	uint8_t sha512[128];
	199	struct sha512_ctx sha512_ctx = {
	200	.buf = sha512,
	201	};
	202
bd6f78b2 JA	203	dprint(FD_VERIFY, "sha512 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	204
cd14cc10	205	sha512_init(&sha512_ctx);
87677832	206	sha512_update(&sha512_ctx, p, hdr->len - hdr_size(hdr));
cd14cc10	207
546dfd9f	208	if (memcmp(vh->sha512, sha512_ctx.buf, sizeof(sha512))) {
cd14cc10 JA	209	log_err("sha512: verify failed at %llu/%u\n",
	210	io_u->offset + header_num * hdr->len,
	211	hdr->len);
546dfd9f	212	hexdump(vh->sha512, sizeof(vh->sha512));
cd14cc10	213	hexdump(sha512_ctx.buf, sizeof(sha512));
d16d4e09	214	return EIO;
cd14cc10 JA	215	}
	216
	217	return 0;
	218	}
	219
	220	static int verify_io_u_sha256(struct verify_header hdr, struct io_u io_u,
	221	unsigned int header_num)
	222	{
	223	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f	224	struct vhdr_sha256 *vh = hdr_priv(hdr);
cd14cc10 JA	225	uint8_t sha256[128];
	226	struct sha256_ctx sha256_ctx = {
	227	.buf = sha256,
	228	};
	229
bd6f78b2 JA	230	dprint(FD_VERIFY, "sha256 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	231
cd14cc10	232	sha256_init(&sha256_ctx);
87677832	233	sha256_update(&sha256_ctx, p, hdr->len - hdr_size(hdr));
cd14cc10	234
546dfd9f	235	if (memcmp(vh->sha256, sha256_ctx.buf, sizeof(sha256))) {
cd14cc10 JA	236	log_err("sha256: verify failed at %llu/%u\n",
	237	io_u->offset + header_num * hdr->len,
	238	hdr->len);
546dfd9f	239	hexdump(vh->sha256, sizeof(vh->sha256));
cd14cc10	240	hexdump(sha256_ctx.buf, sizeof(sha256));
d16d4e09	241	return EIO;
cd14cc10 JA	242	}
	243
	244	return 0;
	245	}
	246
3f9f4e26 SL	247	static int verify_io_u_crc7(struct verify_header hdr, struct io_u io_u,
3f9f4e26 SL	248	unsigned char header_num)
1e154bdb	249	{
d9f2caf3	250	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f	251	struct vhdr_crc7 *vh = hdr_priv(hdr);
1e154bdb JA	252	unsigned char c;
1e154bdb JA	253
bd6f78b2 JA	254	dprint(FD_VERIFY, "crc7 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	255
87677832	256	c = crc7(p, hdr->len - hdr_size(hdr));
1e154bdb	257
546dfd9f	258	if (c != vh->crc7) {
3f9f4e26 SL	259	log_err("crc7: verify failed at %llu/%u\n",
	260	io_u->offset + header_num * hdr->len,
	261	hdr->len);
546dfd9f	262	log_err("crc7: wanted %x, got %x\n", vh->crc7, c);
d16d4e09	263	return EIO;
1e154bdb JA	264	}
	265
	266	return 0;
	267	}
	268
3f9f4e26 SL	269	static int verify_io_u_crc16(struct verify_header hdr, struct io_u io_u,
3f9f4e26 SL	270	unsigned int header_num)
969f7ed3	271	{
d9f2caf3	272	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f	273	struct vhdr_crc16 *vh = hdr_priv(hdr);
969f7ed3 JA	274	unsigned short c;
969f7ed3 JA	275
bd6f78b2 JA	276	dprint(FD_VERIFY, "crc16 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	277
87677832	278	c = crc16(p, hdr->len - hdr_size(hdr));
969f7ed3	279
546dfd9f	280	if (c != vh->crc16) {
3f9f4e26 SL	281	log_err("crc16: verify failed at %llu/%u\n",
	282	io_u->offset + header_num * hdr->len,
	283	hdr->len);
546dfd9f	284	log_err("crc16: wanted %x, got %x\n", vh->crc16, c);
d16d4e09	285	return EIO;
969f7ed3 JA	286	}
	287
	288	return 0;
	289	}
	290
3f9f4e26 SL	291	static int verify_io_u_crc64(struct verify_header hdr, struct io_u io_u,
3f9f4e26 SL	292	unsigned int header_num)
d77a7af3	293	{
d9f2caf3	294	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f	295	struct vhdr_crc64 *vh = hdr_priv(hdr);
d77a7af3 JA	296	unsigned long long c;
d77a7af3 JA	297
bd6f78b2 JA	298	dprint(FD_VERIFY, "crc64 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	299
87677832	300	c = crc64(p, hdr->len - hdr_size(hdr));
d77a7af3	301
546dfd9f	302	if (c != vh->crc64) {
3f9f4e26 SL	303	log_err("crc64: verify failed at %llu/%u\n",
	304	io_u->offset + header_num * hdr->len,
	305	hdr->len);
546dfd9f	306	log_err("crc64: wanted %llx, got %llx\n", (unsigned long long) vh->crc64, c);
d16d4e09	307	return EIO;
d77a7af3 JA	308	}
	309
	310	return 0;
	311	}
	312
3f9f4e26 SL	313	static int verify_io_u_crc32(struct verify_header hdr, struct io_u io_u,
3f9f4e26 SL	314	unsigned int header_num)
e29d1b70	315	{
d9f2caf3	316	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f JA	317	struct vhdr_crc32 *vh = hdr_priv(hdr);
546dfd9f JA	318	uint32_t c;
e29d1b70	319
bd6f78b2 JA	320	dprint(FD_VERIFY, "crc32 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	321
87677832	322	c = crc32(p, hdr->len - hdr_size(hdr));
e29d1b70	323
546dfd9f	324	if (c != vh->crc32) {
3f9f4e26 SL	325	log_err("crc32: verify failed at %llu/%u\n",
	326	io_u->offset + header_num * hdr->len,
	327	hdr->len);
546dfd9f	328	log_err("crc32: wanted %x, got %x\n", vh->crc32, c);
d16d4e09	329	return EIO;
e29d1b70 JA	330	}
	331
	332	return 0;
	333	}
	334
3f9f4e26 SL	335	static int verify_io_u_md5(struct verify_header hdr, struct io_u io_u,
3f9f4e26 SL	336	unsigned int header_num)
e29d1b70	337	{
d9f2caf3	338	void *p = io_u_verify_off(hdr, io_u, header_num);
546dfd9f	339	struct vhdr_md5 *vh = hdr_priv(hdr);
8c432325 JA	340	uint32_t hash[MD5_HASH_WORDS];
	341	struct md5_ctx md5_ctx = {
	342	.hash = hash,
	343	};
e29d1b70	344
bd6f78b2 JA	345	dprint(FD_VERIFY, "md5 verify io_u %p, len %u\n", io_u, hdr->len);
bd6f78b2 JA	346
61f821f1	347	md5_init(&md5_ctx);
87677832	348	md5_update(&md5_ctx, p, hdr->len - hdr_size(hdr));
e29d1b70	349
546dfd9f	350	if (memcmp(vh->md5_digest, md5_ctx.hash, sizeof(hash))) {
3f9f4e26 SL	351	log_err("md5: verify failed at %llu/%u\n",
	352	io_u->offset + header_num * hdr->len,
	353	hdr->len);
546dfd9f	354	hexdump(vh->md5_digest, sizeof(vh->md5_digest));
8c432325	355	hexdump(md5_ctx.hash, sizeof(hash));
d16d4e09	356	return EIO;
e29d1b70 JA	357	}
	358
	359	return 0;
	360	}
	361
3f199b01 JA	362	static unsigned int hweight8(unsigned int w)
	363	{
	364	unsigned int res = w - ((w >> 1) & 0x55);
	365
	366	res = (res & 0x33) + ((res >> 2) & 0x33);
	367	return (res + (res >> 4)) & 0x0F;
	368	}
	369
a944e335	370	int verify_io_u_pattern(unsigned long pattern, unsigned long pattern_size,
4764aec9	371	char *buf, unsigned int len, unsigned int mod)
a944e335 SL	372	{
	373	unsigned int i;
	374	char split_pattern[4];
	375
	376	for (i = 0; i < 4; i++) {
	377	split_pattern[i] = pattern & 0xff;
	378	pattern >>= 8;
	379	}
	380
	381	for (i = 0; i < len; i++) {
3f199b01 JA	382	if (buf[i] != split_pattern[mod]) {
	383	unsigned int bits;
	384
	385	bits = hweight8(buf[i] ^ split_pattern[mod]);
	386	log_err("fio: got pattern %x, wanted %x. Bad bits %d\n",
	387	buf[i], split_pattern[mod], bits);
	388	log_err("fio: bad pattern block offset %u\n", i);
d16d4e09	389	return EIO;
3f199b01	390	}
a944e335 SL	391	mod++;
	392	if (mod == pattern_size)
	393	mod = 0;
	394	}
	395
	396	return 0;
	397	}
	398
36690c9b	399	int verify_io_u(struct thread_data td, struct io_u io_u)
e29d1b70	400	{
3f9f4e26	401	struct verify_header *hdr;
a944e335	402	unsigned int hdr_size, hdr_inc, hdr_num = 0;
95646108	403	void *p;
e29d1b70 JA	404	int ret;
e29d1b70 JA	405
1dcc0498	406	if (td->o.verify == VERIFY_NULL \|\| io_u->ddir != DDIR_READ)
36690c9b JA	407	return 0;
36690c9b JA	408
3f9f4e26	409	hdr_inc = io_u->buflen;
a59e170d JA	410	if (td->o.verify_interval)
a59e170d JA	411	hdr_inc = td->o.verify_interval;
e29d1b70	412
a12a3b4d	413	ret = 0;
3f199b01	414	for (p = io_u->buf; p < io_u->buf + io_u->buflen; p += hdr_inc, hdr_num++) {
a12a3b4d JA	415	if (ret && td->o.verify_fatal) {
	416	td->terminate = 1;
	417	break;
	418	}
a944e335	419	hdr_size = __hdr_size(td->o.verify);
a59e170d	420	if (td->o.verify_offset)
a944e335	421	memswp(p, p + td->o.verify_offset, hdr_size);
95646108	422	hdr = p;
e29d1b70	423
3f199b01 JA	424	if (hdr->fio_magic != FIO_HDR_MAGIC) {
	425	log_err("Bad verify header %x\n", hdr->fio_magic);
	426	return EIO;
	427	}
	428
e28218f3	429	if (td->o.verify_pattern_bytes) {
bd6f78b2 JA	430	dprint(FD_VERIFY, "pattern verify io_u %p, len %u\n",
bd6f78b2 JA	431	io_u, hdr->len);
e28218f3 SL	432	ret = verify_io_u_pattern(td->o.verify_pattern,
	433	td->o.verify_pattern_bytes,
	434	p + hdr_size,
	435	hdr_inc - hdr_size,
	436	hdr_size % 4);
	437	if (ret)
	438	log_err("fio: verify failed at %llu/%u\n",
	439	io_u->offset + hdr_num * hdr->len,
	440	hdr->len);
	441	continue;
	442	}
	443
3f9f4e26 SL	444	switch (hdr->verify_type) {
	445	case VERIFY_MD5:
	446	ret = verify_io_u_md5(hdr, io_u, hdr_num);
	447	break;
	448	case VERIFY_CRC64:
	449	ret = verify_io_u_crc64(hdr, io_u, hdr_num);
	450	break;
	451	case VERIFY_CRC32:
	452	ret = verify_io_u_crc32(hdr, io_u, hdr_num);
	453	break;
	454	case VERIFY_CRC16:
	455	ret = verify_io_u_crc16(hdr, io_u, hdr_num);
	456	break;
	457	case VERIFY_CRC7:
	458	ret = verify_io_u_crc7(hdr, io_u, hdr_num);
	459	break;
cd14cc10 JA	460	case VERIFY_SHA256:
	461	ret = verify_io_u_sha256(hdr, io_u, hdr_num);
	462	break;
	463	case VERIFY_SHA512:
	464	ret = verify_io_u_sha512(hdr, io_u, hdr_num);
	465	break;
7437ee87 SL	466	case VERIFY_META:
	467	ret = verify_io_u_meta(hdr, td, io_u, hdr_num);
	468	break;
3f9f4e26 SL	469	default:
3f9f4e26 SL	470	log_err("Bad verify type %u\n", hdr->verify_type);
d16d4e09	471	ret = EINVAL;
3f9f4e26	472	}
3f9f4e26	473	}
a7dfe862	474
a12a3b4d	475	return ret;
e29d1b70 JA	476	}
e29d1b70 JA	477
7437ee87 SL	478	static void fill_meta(struct verify_header hdr, struct thread_data td,
	479	struct io_u *io_u, unsigned int header_num)
	480	{
	481	struct vhdr_meta *vh = hdr_priv(hdr);
	482
	483	vh->thread = td->thread_number;
	484
	485	vh->time_sec = io_u->start_time.tv_sec;
	486	vh->time_usec = io_u->start_time.tv_usec;
	487
	488	vh->numberio = td->io_issues[DDIR_WRITE];
	489
	490	vh->offset = io_u->offset + header_num * td->o.verify_interval;
	491	}
	492
cd14cc10 JA	493	static void fill_sha512(struct verify_header hdr, void p, unsigned int len)
cd14cc10 JA	494	{
546dfd9f	495	struct vhdr_sha512 *vh = hdr_priv(hdr);
cd14cc10	496	struct sha512_ctx sha512_ctx = {
546dfd9f	497	.buf = vh->sha512,
cd14cc10 JA	498	};
	499
	500	sha512_init(&sha512_ctx);
	501	sha512_update(&sha512_ctx, p, len);
	502	}
	503
	504	static void fill_sha256(struct verify_header hdr, void p, unsigned int len)
	505	{
546dfd9f	506	struct vhdr_sha256 *vh = hdr_priv(hdr);
cd14cc10	507	struct sha256_ctx sha256_ctx = {
546dfd9f	508	.buf = vh->sha256,
cd14cc10 JA	509	};
	510
	511	sha256_init(&sha256_ctx);
	512	sha256_update(&sha256_ctx, p, len);
	513	}
	514
1e154bdb JA	515	static void fill_crc7(struct verify_header hdr, void p, unsigned int len)
1e154bdb JA	516	{
546dfd9f JA	517	struct vhdr_crc7 *vh = hdr_priv(hdr);
	518
	519	vh->crc7 = crc7(p, len);
1e154bdb JA	520	}
1e154bdb JA	521
969f7ed3 JA	522	static void fill_crc16(struct verify_header hdr, void p, unsigned int len)
969f7ed3 JA	523	{
546dfd9f JA	524	struct vhdr_crc16 *vh = hdr_priv(hdr);
	525
	526	vh->crc16 = crc16(p, len);
969f7ed3 JA	527	}
969f7ed3 JA	528
e29d1b70 JA	529	static void fill_crc32(struct verify_header hdr, void p, unsigned int len)
e29d1b70 JA	530	{
546dfd9f JA	531	struct vhdr_crc32 *vh = hdr_priv(hdr);
	532
	533	vh->crc32 = crc32(p, len);
e29d1b70 JA	534	}
e29d1b70 JA	535
d77a7af3 JA	536	static void fill_crc64(struct verify_header hdr, void p, unsigned int len)
d77a7af3 JA	537	{
546dfd9f JA	538	struct vhdr_crc64 *vh = hdr_priv(hdr);
	539
	540	vh->crc64 = crc64(p, len);
d77a7af3 JA	541	}
d77a7af3 JA	542
e29d1b70 JA	543	static void fill_md5(struct verify_header hdr, void p, unsigned int len)
e29d1b70 JA	544	{
546dfd9f	545	struct vhdr_md5 *vh = hdr_priv(hdr);
8c432325	546	struct md5_ctx md5_ctx = {
546dfd9f	547	.hash = (uint32_t *) vh->md5_digest,
8c432325	548	};
e29d1b70	549
61f821f1	550	md5_init(&md5_ctx);
e29d1b70	551	md5_update(&md5_ctx, p, len);
e29d1b70 JA	552	}
	553
	554	/*
	555	* fill body of io_u->buf with random data and add a header with the
	556	* crc32 or md5 sum of that data.
	557	*/
	558	void populate_verify_io_u(struct thread_data td, struct io_u io_u)
	559	{
baefa9be	560	struct verify_header *hdr;
95646108	561	void p = io_u->buf, data;
7437ee87	562	unsigned int hdr_inc, data_len, header_num = 0;
e29d1b70	563
9cc3d150 JA	564	if (td->o.verify == VERIFY_NULL)
	565	return;
	566
90059d65	567	fill_pattern(td, p, io_u->buflen);
546a9142 SL	568
546a9142 SL	569	hdr_inc = io_u->buflen;
a59e170d JA	570	if (td->o.verify_interval)
a59e170d JA	571	hdr_inc = td->o.verify_interval;
baefa9be	572
95646108 JA	573	for (;p < io_u->buf + io_u->buflen; p += hdr_inc) {
95646108 JA	574	hdr = p;
3f9f4e26 SL	575
	576	hdr->fio_magic = FIO_HDR_MAGIC;
	577	hdr->verify_type = td->o.verify;
546a9142	578	hdr->len = hdr_inc;
87677832	579	data_len = hdr_inc - hdr_size(hdr);
3f9f4e26	580
87677832	581	data = p + hdr_size(hdr);
3f9f4e26 SL	582	switch (td->o.verify) {
3f9f4e26 SL	583	case VERIFY_MD5:
bd6f78b2 JA	584	dprint(FD_VERIFY, "fill md5 io_u %p, len %u\n",
bd6f78b2 JA	585	io_u, hdr->len);
3f9f4e26 SL	586	fill_md5(hdr, data, data_len);
	587	break;
	588	case VERIFY_CRC64:
bd6f78b2 JA	589	dprint(FD_VERIFY, "fill crc64 io_u %p, len %u\n",
bd6f78b2 JA	590	io_u, hdr->len);
3f9f4e26 SL	591	fill_crc64(hdr, data, data_len);
	592	break;
	593	case VERIFY_CRC32:
bd6f78b2 JA	594	dprint(FD_VERIFY, "fill crc32 io_u %p, len %u\n",
bd6f78b2 JA	595	io_u, hdr->len);
3f9f4e26 SL	596	fill_crc32(hdr, data, data_len);
	597	break;
	598	case VERIFY_CRC16:
bd6f78b2 JA	599	dprint(FD_VERIFY, "fill crc16 io_u %p, len %u\n",
bd6f78b2 JA	600	io_u, hdr->len);
3f9f4e26 SL	601	fill_crc16(hdr, data, data_len);
	602	break;
	603	case VERIFY_CRC7:
bd6f78b2 JA	604	dprint(FD_VERIFY, "fill crc7 io_u %p, len %u\n",
bd6f78b2 JA	605	io_u, hdr->len);
3f9f4e26 SL	606	fill_crc7(hdr, data, data_len);
3f9f4e26 SL	607	break;
cd14cc10	608	case VERIFY_SHA256:
bd6f78b2 JA	609	dprint(FD_VERIFY, "fill sha256 io_u %p, len %u\n",
bd6f78b2 JA	610	io_u, hdr->len);
cd14cc10 JA	611	fill_sha256(hdr, data, data_len);
	612	break;
	613	case VERIFY_SHA512:
bd6f78b2 JA	614	dprint(FD_VERIFY, "fill sha512 io_u %p, len %u\n",
bd6f78b2 JA	615	io_u, hdr->len);
cd14cc10 JA	616	fill_sha512(hdr, data, data_len);
cd14cc10 JA	617	break;
7437ee87	618	case VERIFY_META:
bd6f78b2 JA	619	dprint(FD_VERIFY, "fill meta io_u %p, len %u\n",
bd6f78b2 JA	620	io_u, hdr->len);
7437ee87 SL	621	fill_meta(hdr, td, io_u, header_num);
7437ee87 SL	622	break;
3f9f4e26 SL	623	default:
	624	log_err("fio: bad verify type: %d\n", td->o.verify);
	625	assert(0);
	626	}
a59e170d	627	if (td->o.verify_offset)
87677832	628	memswp(p, p + td->o.verify_offset, hdr_size(hdr));
7437ee87	629	header_num++;
e29d1b70	630	}
e29d1b70 JA	631	}
	632
	633	int get_next_verify(struct thread_data td, struct io_u io_u)
	634	{
8de8f047	635	struct io_piece *ipo = NULL;
e29d1b70	636
d2d7fa53 JA	637	/*
	638	* this io_u is from a requeue, we already filled the offsets
	639	*/
	640	if (io_u->file)
	641	return 0;
	642
8de8f047 JA	643	if (!RB_EMPTY_ROOT(&td->io_hist_tree)) {
8de8f047 JA	644	struct rb_node *n = rb_first(&td->io_hist_tree);
e29d1b70	645
8de8f047	646	ipo = rb_entry(n, struct io_piece, rb_node);
4b87898e	647	rb_erase(n, &td->io_hist_tree);
8de8f047 JA	648	} else if (!list_empty(&td->io_hist_list)) {
	649	ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
	650	list_del(&ipo->list);
	651	}
e29d1b70	652
8de8f047	653	if (ipo) {
e29d1b70 JA	654	io_u->offset = ipo->offset;
e29d1b70 JA	655	io_u->buflen = ipo->len;
36167d82	656	io_u->file = ipo->file;
97af62ce JA	657
	658	if ((io_u->file->flags & FIO_FILE_OPEN) == 0) {
	659	int r = td_io_open_file(td, io_u->file);
	660
bd6f78b2 JA	661	if (r) {
	662	dprint(FD_VERIFY, "failed file %s open\n",
	663	io_u->file->file_name);
97af62ce	664	return 1;
bd6f78b2	665	}
97af62ce JA	666	}
	667
	668	get_file(ipo->file);
	669	assert(io_u->file->flags & FIO_FILE_OPEN);
e29d1b70	670	io_u->ddir = DDIR_READ;
36167d82 JA	671	io_u->xfer_buf = io_u->buf;
36167d82 JA	672	io_u->xfer_buflen = io_u->buflen;
e29d1b70	673	free(ipo);
bd6f78b2	674	dprint(FD_VERIFY, "get_next_verify: ret io_u %p\n", io_u);
e29d1b70 JA	675	return 0;
	676	}
	677
bd6f78b2	678	dprint(FD_VERIFY, "get_next_verify: empty\n");
e29d1b70 JA	679	return 1;
e29d1b70 JA	680	}