From 5924538164650c6c0dc0e866d6ed15eb199ed020 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@fb.com>
Date: Mon, 8 Jun 2015 20:43:43 -0600
Subject: [PATCH] verify: add raw pattern verify

Add specific verify=pattern that doesn't use any headers, it
just writes the specified pattern and verifies it.

Signed-off-by: Jens Axboe <axboe@fb.com>
---
 HOWTO     |  6 ++++++
 fio.1     |  7 ++++++-
 options.c |  6 ++++++
 verify.c  | 13 ++++++++++---
 verify.h  |  1 +
 5 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/HOWTO b/HOWTO
index 291327d5..61ebe5e9 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1281,6 +1281,12 @@ verify=str	If writing to a file, fio can verify the file contents
 				verified for workloads that write data.
 				See also verify_pattern.
 
+			pattern	Verify a strict pattern. Normally fio includes
+				a header with some basic information and
+				checksumming, but if this option is set, only
+				the specific pattern set with 'verify_pattern'
+				is verified.
+
 			null	Only pretend to verify. Useful for testing
 				internals with ioengine=null, not for much
 				else.
diff --git a/fio.1 b/fio.1
index 16570825..5f8e9482 100644
--- a/fio.1
+++ b/fio.1
@@ -1129,6 +1129,11 @@ not supported by the system.
 Write extra information about each I/O (timestamp, block number, etc.). The
 block number is verified. See \fBverify_pattern\fR as well.
 .TP
+.B pattern
+Verify a strict pattern. Normally fio includes a header with some basic
+information and checksumming, but if this option is set, only the
+specific pattern set with \fBverify_pattern\fR is verified.
+.TP
 .B null
 Pretend to verify.  Used for testing internals.
 .RE
@@ -1162,7 +1167,7 @@ pattern for io verification purposes. Depending on the width of the pattern,
 fio will fill 1/2/3/4 bytes of the buffer at the time(it can be either a
 decimal or a hex number). The verify_pattern if larger than a 32-bit quantity
 has to be a hex number that starts with either "0x" or "0X". Use with
-\fBverify\fP=meta.
+\fBverify\fP=meta or \fBverify\fP=pattern.
 .TP
 .BI verify_fatal \fR=\fPbool
 If true, exit the job on the first observed verification failure.  Default:
diff --git a/options.c b/options.c
index 96b8b682..cd371417 100644
--- a/options.c
+++ b/options.c
@@ -983,6 +983,8 @@ static int pattern_cb(char *pattern, unsigned int max_size,
 	 */
 fill:
 	pattern_length = i;
+	if (!i && !off)
+		i = 1;
 	while (i > 1 && i * 2 <= max_size) {
 		memcpy(&pattern[i], &pattern[0], i);
 		i *= 2;
@@ -2400,6 +2402,10 @@ struct fio_option fio_options[FIO_MAX_OPTS] = {
 			    .oval = VERIFY_META,
 			    .help = "Use io information",
 			  },
+			  { .ival = "pattern",
+			    .oval = VERIFY_PATTERN_NO_HDR,
+			    .help = "Verify strict pattern",
+			  },
 			  {
 			    .ival = "null",
 			    .oval = VERIFY_NULL,
diff --git a/verify.c b/verify.c
index fcdf7488..806f41e7 100644
--- a/verify.c
+++ b/verify.c
@@ -168,6 +168,7 @@ static inline unsigned int __hdr_size(int verify_type)
 		len = sizeof(struct vhdr_sha1);
 		break;
 	case VERIFY_PATTERN:
+	case VERIFY_PATTERN_NO_HDR:
 		len = 0;
 		break;
 	default:
@@ -787,9 +788,11 @@ int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
 		if (td->o.verifysort || (td->flags & TD_F_VER_BACKLOG))
 			io_u->rand_seed = hdr->rand_seed;
 
-		ret = verify_header(io_u, hdr, hdr_num, hdr_inc);
-		if (ret)
-			return ret;
+		if (td->o.verify != VERIFY_PATTERN_NO_HDR) {
+			ret = verify_header(io_u, hdr, hdr_num, hdr_inc);
+			if (ret)
+				return ret;
+		}
 
 		if (td->o.verify != VERIFY_NONE)
 			verify_type = td->o.verify;
@@ -832,6 +835,7 @@ int verify_io_u(struct thread_data *td, struct io_u **io_u_ptr)
 			ret = verify_io_u_sha1(hdr, &vc);
 			break;
 		case VERIFY_PATTERN:
+		case VERIFY_PATTERN_NO_HDR:
 			ret = verify_io_u_pattern(hdr, &vc);
 			break;
 		default:
@@ -965,6 +969,9 @@ static void populate_hdr(struct thread_data *td, struct io_u *io_u,
 	unsigned int data_len;
 	void *data, *p;
 
+	if (td->o.verify == VERIFY_PATTERN_NO_HDR)
+		return;
+
 	p = (void *) hdr;
 
 	hdr->magic = FIO_HDR_MAGIC;
diff --git a/verify.h b/verify.h
index d4d6012b..c37b1d56 100644
--- a/verify.h
+++ b/verify.h
@@ -20,6 +20,7 @@ enum {
 	VERIFY_META,			/* block_num, timestamp etc. */
 	VERIFY_SHA1,			/* sha1 sum data blocks */
 	VERIFY_PATTERN,			/* verify specific patterns */
+	VERIFY_PATTERN_NO_HDR,		/* verify specific patterns, no hdr */
 	VERIFY_NULL,			/* pretend to verify */
 };
 
-- 
2.25.1