HOWTO/man: Describe trim support by zone reset for zoned devices

Previous commits added trim support for zoned devices. Update HOWTO and
man page to describe it. Also add missing description about libzbc I/O
engine to HOWTO.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Reviewed-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/HOWTO b/HOWTO
index d4e620de50b5b178af1612af7837f2035574c33c..04ea284b5badc3cde2c31a7987fb2ea32918afcb 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -992,6 +992,9 @@ Target file/device
                                single zone. The :option:`zoneskip` parameter
                                is ignored. :option:`zonerange` and
                                :option:`zonesize` must be identical.
+                               Trim is handled using a zone reset operation.
+                               Trim only considers non-empty sequential write
+                               required and sequential write preferred zones.
 
 .. option:: zonerange=int
 
@@ -1965,6 +1968,11 @@ I/O engine
                        character devices. This engine supports trim operations.
                        The sg engine includes engine specific options.
 
+               **libzbc**
+                       Read, write, trim and ZBC/ZAC operations to a zoned
+                       block device using libzbc library. The target can be
+                       either an SG character device or a block device file.
+
                **null**
                        Doesn't transfer any data, just pretends to.  This is mainly used to
                        exercise fio itself and for debugging/testing purposes.

diff --git a/fio.1 b/fio.1
index 9c12ad1318b7e130aacf403fc5e8375eb5d87f9b..ff100a1ca6725a08426043c85010d96fc94f1009 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -766,6 +766,8 @@ starts. The \fBzonecapacity\fR parameter is ignored.
 Zoned block device mode. I/O happens sequentially in each zone, even if random
 I/O has been selected. Random I/O happens across all zones instead of being
 restricted to a single zone.
+Trim is handled using a zone reset operation. Trim only considers non-empty
+sequential write required and sequential write preferred zones.
 .RE
 .RE
 .TP
@@ -1761,10 +1763,9 @@ character devices. This engine supports trim operations. The
 sg engine includes engine specific options.
 .TP
 .B libzbc
-Synchronous I/O engine for SMR hard-disks using the \fBlibzbc\fR
-library. The target can be either an sg character device or
-a block device file. This engine supports the zonemode=zbd zone
-operations.
+Read, write, trim and ZBC/ZAC operations to a zoned block device using
+\fBlibzbc\fR library. The target can be either an SG character device or
+a block device file.
 .TP
 .B null
 Doesn't transfer any data, just pretends to. This is mainly used to