Add randtrimwrite data directionrandtrimwrite

This works like trimwrite, except we use random offsets for the trim
location rather than sequential ones.

Suggested-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

4 files changed, 15 insertions, 1 deletions

diff --git a/HOWTO.rst b/HOWTO.rst
index 924f5ed95..e89d05f04 100644
--- a/HOWTO.rst
+++ b/HOWTO.rst
@@ -1134,6 +1134,9 @@ I/O type
 				write 64K bytes on the same trimmed blocks. This behaviour
 				will be consistent with ``number_ios`` or other Fio options
 				limiting the total bytes or number of I/O's.
+		**randtrimwrite**
+				Like trimwrite, but uses random offsets rather
+				than sequential writes.
 
 	Fio defaults to read if the option is not specified.  For the mixed I/O
 	types, the default is to split them 50/50.  For certain types of I/O the
diff --git a/fio.1 b/fio.1
index 39d6b4f49..4324a9750 100644
--- a/fio.1
+++ b/fio.1
@@ -904,6 +904,11 @@ then the same blocks will be written to. So if `io_size=64K' is specified,
 Fio will trim a total of 64K bytes and also write 64K bytes on the same
 trimmed blocks. This behaviour will be consistent with `number_ios' or
 other Fio options limiting the total bytes or number of I/O's.
+.TP
+.B randtrimwrite
+Like
+.B trimwrite ,
+but uses random offsets rather than sequential writes.
 .RE
 .P
 Fio defaults to read if the option is not specified. For the mixed I/O
diff --git a/io_ddir.h b/io_ddir.h
index 296a9d04a..7227e9ee7 100644
--- a/io_ddir.h
+++ b/io_ddir.h
@@ -41,6 +41,7 @@ enum td_ddir {
 	TD_DDIR_RANDRW		= TD_DDIR_RW | TD_DDIR_RAND,
 	TD_DDIR_RANDTRIM	= TD_DDIR_TRIM | TD_DDIR_RAND,
 	TD_DDIR_TRIMWRITE	= TD_DDIR_TRIM | TD_DDIR_WRITE,
+	TD_DDIR_RANDTRIMWRITE	= TD_DDIR_RANDTRIM | TD_DDIR_WRITE,
 };
 
 #define td_read(td)		((td)->o.td_ddir & TD_DDIR_READ)
@@ -67,7 +68,8 @@ static inline const char *ddir_str(enum td_ddir ddir)
 {
 	static const char *__str[] = { NULL, "read", "write", "rw", "rand",
 				"randread", "randwrite", "randrw",
-				"trim", NULL, "trimwrite", NULL, "randtrim" };
+				"trim", NULL, "trimwrite", NULL, "randtrim",
+				NULL, "randtrimwrite" };
 
 	return __str[ddir];
 }
diff --git a/options.c b/options.c
index 5d3daedf3..a668b0e47 100644
--- a/options.c
+++ b/options.c
@@ -1947,6 +1947,10 @@ struct fio_option fio_options[FIO_MAX_OPTS] = {
 			    .oval = TD_DDIR_TRIMWRITE,
 			    .help = "Trim and write mix, trims preceding writes"
 			  },
+			  { .ival = "randtrimwrite",
+			    .oval = TD_DDIR_RANDTRIMWRITE,
+			    .help = "Randomly trim and write mix, trims preceding writes"
+			  },
 		},
 	},
 	{