doc: improve readonly option description

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index ce3585a43a6660bdda2e45000bea7e9a9825c6ec..c744d1add10f869284127b0261873404ebe2c098 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -68,12 +68,11 @@ available ioengines.
 Convert \fIjobfile\fR to a set of command\-line options.
 .TP
 .BI \-\-readonly
 Convert \fIjobfile\fR to a set of command\-line options.
 .TP
 .BI \-\-readonly

-Turn on safety read\-only checks, preventing writes. The \fB\-\-readonly\fR
+Turn on safety read\-only checks, preventing writes and trims. The \fB\-\-readonly\fR

 option is an extra safety guard to prevent users from accidentally starting
 option is an extra safety guard to prevent users from accidentally starting

-a write workload when that is not desired. Fio will only write if
-`rw=write/randwrite/rw/randrw' is given. This extra safety net can be used
-as an extra precaution as \fB\-\-readonly\fR will also enable a write check in
-the I/O engine core to prevent writes due to unknown user space bug(s).
+a write or trim workload when that is not desired. Fio will only modify the
+device under test if `rw=write/randwrite/rw/randrw/trim/randtrim/trimwrite'
+is given. This safety net can be used as an extra precaution.

 .TP
 .BI \-\-eta \fR=\fPwhen
 Specifies when real\-time ETA estimate should be printed. \fIwhen\fR may
 .TP
 .BI \-\-eta \fR=\fPwhen
 Specifies when real\-time ETA estimate should be printed. \fIwhen\fR may


@@ -1227,7 +1226,7 @@ If you want a workload that has 50% 2k reads and 50% 4k reads, while having
 90% 4k writes and 10% 8k writes, you would specify:
 .RS
 .P
 90% 4k writes and 10% 8k writes, you would specify:
 .RS
 .P

-bssplit=2k/50:4k/50,4k/90,8k/10
+bssplit=2k/50:4k/50,4k/90:8k/10

 .RE
 .P
 Fio supports defining up to 64 different weights for each data direction.
 .RE
 .P
 Fio supports defining up to 64 different weights for each data direction.