[PATCH 5/7] verify/trim: make trim_backlog_batch work

In order to detect when we are at the beginning of a trim phase we check
io_hist_len and should check that the previous operation was not a
*trim* (instead of not a read). Without this change trim_backlog_batch
will have no effect because after one batch is done, fio will simply
start a new batch because io_hist_len is still a multiple of
trim_backlog and the last operation in a batch was a trim which is not a
read.

For check_get_verify checking against read is appropriate but for
check_get_trim we must check against a trim.

Also we need to decrement the trim_batch count for the first trim
operation we send through.

Signed-off-by: Vincent Fu <[email protected]>
---
 io_u.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/io_u.c b/io_u.c
index 66cfa16a..17f5e853 100644
--- a/io_u.c
+++ b/io_u.c
@@ -1761,12 +1761,14 @@ static bool check_get_trim(struct thread_data *td, struct io_u *io_u)
 		else
 			td->trim_batch = 0;
 	} else if (!(td->io_hist_len % td->o.trim_backlog) &&
-		     td->last_ddir_completed != DDIR_READ) {
-		td->trim_batch = td->o.trim_batch;
-		if (!td->trim_batch)
-			td->trim_batch = td->o.trim_backlog;
-		if (get_next_trim(td, io_u))
+		     td->last_ddir_completed != DDIR_TRIM) {
+		if (get_next_trim(td, io_u)) {
+			td->trim_batch = td->o.trim_batch;
+			if (!td->trim_batch)
+				td->trim_batch = td->o.trim_backlog;
+			td->trim_batch--;
 			return true;
+		}
 	}
 
 	return false;
-- 
2.47.2