[PATCH 1/1] backend: number of ios not as expected for trimwrite

[Ankit Kumar <ankit.kumar@samsung.com>]

number_ios should be twice for trimwrite, just like size or
io_size. Update the documentation for "rw=trimwrite" to explain the
changes.

Signed-off-by: Ankit Kumar <ankit.kumar@samsung.com>
---
 HOWTO.rst | 6 +++++-
 backend.c | 6 ++++--
 fio.1     | 5 ++++-
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/HOWTO.rst b/HOWTO.rst
index 2c6c6dbe..924f5ed9 100644
--- a/HOWTO.rst
+++ b/HOWTO.rst
@@ -1129,7 +1129,11 @@ I/O type
 				Random mixed reads and writes.
 		**trimwrite**
 				Sequential trim+write sequences. Blocks will be trimmed first,
-				then the same blocks will be written to.
+				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.
 
 	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/backend.c b/backend.c
index fe614f6e..ec535bcc 100644
--- a/backend.c
+++ b/backend.c
@@ -971,9 +971,11 @@ static void do_io(struct thread_data *td, uint64_t *bytes_done)
 		total_bytes += td->o.size;
 
 	/* In trimwrite mode, each byte is trimmed and then written, so
-	 * allow total_bytes to be twice as big */
-	if (td_trimwrite(td))
+	 * allow total_bytes or number of ios to be twice as big */
+	if (td_trimwrite(td)) {
 		total_bytes += td->total_io_size;
+		td->o.number_ios *= 2;
+	}
 
 	while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
 		(!flist_empty(&td->trim_list)) || !io_issue_bytes_exceeded(td) ||
diff --git a/fio.1 b/fio.1
index 67d7c710..c67bd464 100644
--- a/fio.1
+++ b/fio.1
@@ -900,7 +900,10 @@ Random mixed reads and writes.
 .TP
 .B trimwrite
 Sequential trim+write sequences. Blocks will be trimmed first,
-then the same blocks will be written to.
+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.
 .RE
 .P
 Fio defaults to read if the option is not specified. For the mixed I/O
-- 
2.17.1