X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=verify.c;h=0bb348ff996995750cc797eca653f5567160e980;hp=6972fe3ff59a2a10604ba708c05c2524a562c83f;hb=5ec10eaad3b09875b91e19a20bbdfa06f2117562;hpb=fd00954ca87b3b083ec6987e593a16ff01913fe8

diff --git a/verify.c b/verify.c
index 6972fe3f..0bb348ff 100644
--- a/verify.c
+++ b/verify.c
@@ -8,8 +8,15 @@
 
 #include "fio.h"
 
-static void fill_random_bytes(struct thread_data *td,
-			      void *p, unsigned int len)
+#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;
@@ -32,9 +39,59 @@ static void fill_random_bytes(struct thread_data *td,
 	}
 }
 
-void memswp(void* buf1, void* buf2, unsigned int len)
+static void fill_pattern(struct thread_data *td, void *p, unsigned int len)
 {
-	struct verify_header swap;
+	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);
@@ -50,111 +107,283 @@ static void hexdump(void *buffer, int len)
 	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)
+				    struct io_u *io_u, unsigned char header_num)
 {
-	return io_u->buf + sizeof(*hdr) + header_num * hdr->len;
+	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)
+			    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;
 
-	c = crc7(p, hdr->len - sizeof(*hdr));
+	dprint(FD_VERIFY, "crc7 verify io_u %p, len %u\n", io_u, hdr->len);
 
-	if (c != hdr->crc7) {
+	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", hdr->crc7, c);
-		return 1;
+				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)
+			     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;
 
-	c = crc16(p, hdr->len - sizeof(*hdr));
+	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 != hdr->crc16) {
+	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", hdr->crc16, c);
-		return 1;
+				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)
+			     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;
 
-	c = crc64(p, hdr->len - sizeof(*hdr));
+	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 != hdr->crc64) {
+	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", hdr->crc64, c);
-		return 1;
+		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)
+			     unsigned int header_num)
 {
 	void *p = io_u_verify_off(hdr, io_u, header_num);
-	unsigned long c;
+	struct vhdr_crc32 *vh = hdr_priv(hdr);
+	uint32_t c;
 
-	c = crc32(p, hdr->len - sizeof(*hdr));
+	dprint(FD_VERIFY, "crc32 verify io_u %p, len %u\n", io_u, hdr->len);
 
-	if (c != hdr->crc32) {
+	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 %lx, got %lx\n", hdr->crc32, c);
-		return 1;
+				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)
+			   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,
 	};
 
-	memset(md5_ctx.hash, 0, sizeof(hdr->md5_digest));
-	md5_update(&md5_ctx, p, hdr->len - sizeof(*hdr));
+	dprint(FD_VERIFY, "md5 verify io_u %p, len %u\n", io_u, hdr->len);
 
-	if (memcmp(hdr->md5_digest, md5_ctx.hash, sizeof(hash))) {
+	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(hdr->md5_digest, sizeof(hdr->md5_digest));
+				io_u->offset + header_num * hdr->len, hdr->len);
+		hexdump(vh->md5_digest, sizeof(vh->md5_digest));
 		hexdump(md5_ctx.hash, sizeof(hash));
-		return 1;
+		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;
@@ -163,7 +392,7 @@ static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u,
 int verify_io_u(struct thread_data *td, struct io_u *io_u)
 {
 	struct verify_header *hdr;
-	unsigned int hdr_inc, hdr_num = 0;
+	unsigned int hdr_size, hdr_inc, hdr_num = 0;
 	void *p;
 	int ret;
 
@@ -171,13 +400,19 @@ int verify_io_u(struct thread_data *td, struct io_u *io_u)
 		return 0;
 
 	hdr_inc = io_u->buflen;
-	if (td->o.header_interval)
-		hdr_inc = td->o.header_interval;
-
-	for (p = io_u->buf; p < io_u->buf + io_u->buflen; p += hdr_inc) {
-		if (td->o.header_offset)
-			memswp(p, p + td->o.header_offset, sizeof(*hdr));
-
+	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) {
@@ -185,6 +420,21 @@ int verify_io_u(struct thread_data *td, struct io_u *io_u)
 			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);
@@ -201,43 +451,97 @@ int verify_io_u(struct thread_data *td, struct io_u *io_u)
 		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 = 1;
+			ret = EINVAL;
 		}
-		hdr_num++;
 	}
 
-	return 0;
+	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)
 {
-	hdr->crc7 = crc7(p, 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)
 {
-	hdr->crc16 = crc16(p, 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)
 {
-	hdr->crc32 = crc32(p, 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)
 {
-	hdr->crc64 = crc64(p, 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 *) hdr->md5_digest,
+		.hash = (uint32_t *) vh->md5_digest,
 	};
 
-	memset(md5_ctx.hash, 0, sizeof(hdr->md5_digest));
+	md5_init(&md5_ctx);
 	md5_update(&md5_ctx, p, len);
 }
 
@@ -249,48 +553,74 @@ 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;
+	unsigned int hdr_inc, data_len, header_num = 0;
 
 	if (td->o.verify == VERIFY_NULL)
 		return;
 
-	fill_random_bytes(td, p, io_u->buflen);
+	fill_pattern(td, p, io_u->buflen);
 
 	hdr_inc = io_u->buflen;
-	if (td->o.header_interval)
-		hdr_inc = td->o.header_interval;
-	data_len = hdr_inc - sizeof(*hdr);
+	if (td->o.verify_interval)
+		hdr_inc = td->o.verify_interval;
 
-	for (;p < io_u->buf + io_u->buflen; p += hdr_inc) {
+	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 + sizeof(*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.header_offset)
-			memswp(p, p + td->o.header_offset, sizeof(*hdr));
+		if (td->o.verify_offset)
+			memswp(p, p + td->o.verify_offset, hdr_size(hdr));
+		header_num++;
 	}
 }
 
@@ -322,8 +652,11 @@ int get_next_verify(struct thread_data *td, struct io_u *io_u)
 		if ((io_u->file->flags & FIO_FILE_OPEN) == 0) {
 			int r = td_io_open_file(td, io_u->file);
 
-			if (r)
+			if (r) {
+				dprint(FD_VERIFY, "failed file %s open\n",
+						io_u->file->file_name);
 				return 1;
+			}
 		}
 
 		get_file(ipo->file);
@@ -332,8 +665,10 @@ int get_next_verify(struct thread_data *td, struct io_u *io_u)
 		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;
 }