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From c047ff61f68d1b853569b153251f8bc5f88e23cd Mon Sep 17 00:00:00 2001
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From: David Teigland <teigland@redhat.com>
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Date: Mon, 21 Feb 2022 16:09:57 -0600
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Subject: [PATCH 34/54] writecache: display block size from lvs
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lvs was missing the ability to display writecache block size.
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now possible with lvs -o writecache_block_size
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---
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lib/report/columns.h | 1 +
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lib/report/properties.c | 2 ++
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lib/report/report.c | 20 ++++++++++++++++++++
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man/lvmcache.7_main | 4 ++++
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test/shell/writecache-cache-blocksize.sh | 2 ++
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5 files changed, 29 insertions(+)
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diff --git a/lib/report/columns.h b/lib/report/columns.h
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index 12b78b766..7e450dace 100644
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--- a/lib/report/columns.h
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+++ b/lib/report/columns.h
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@@ -108,6 +108,7 @@ FIELD(LVS, lv, TIM, "RTime", lvid, 26, lvtimeremoved, lv_time_removed, "Removal
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FIELD(LVS, lv, STR, "Host", lvid, 10, lvhost, lv_host, "Creation host of the LV, if known.", 0)
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FIELD(LVS, lv, STR_LIST, "Modules", lvid, 0, modules, lv_modules, "Kernel device-mapper modules required for this LV.", 0)
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FIELD(LVS, lv, BIN, "Historical", lvid, 0, lvhistorical, lv_historical, "Set if the LV is historical.", 0)
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+FIELD(LVS, lv, NUM, "WCacheBlkSize", lvid, 0, writecache_block_size, writecache_block_size, "The writecache block size", 0)
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/*
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* End of LVS type fields
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*/
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diff --git a/lib/report/properties.c b/lib/report/properties.c
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index 12ea890f4..6f302360f 100644
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--- a/lib/report/properties.c
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+++ b/lib/report/properties.c
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@@ -353,6 +353,8 @@ GET_PV_STR_PROPERTY_FN(pv_device_id_type, pv->device_id_type)
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#define _writecache_writeback_blocks_get prop_not_implemented_get
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#define _writecache_error_set prop_not_implemented_set
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#define _writecache_error_get prop_not_implemented_get
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+#define _writecache_block_size_set prop_not_implemented_set
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+#define _writecache_block_size_get prop_not_implemented_get
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#define _vdo_operating_mode_set prop_not_implemented_set
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#define _vdo_operating_mode_get prop_not_implemented_get
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diff --git a/lib/report/report.c b/lib/report/report.c
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index 60df417a4..c06b22674 100644
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--- a/lib/report/report.c
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+++ b/lib/report/report.c
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@@ -3346,6 +3346,26 @@ static int _integritymismatches_disp(struct dm_report *rh __attribute__((unused)
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return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
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}
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+static int _writecache_block_size_disp(struct dm_report *rh __attribute__((unused)),
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+ struct dm_pool *mem,
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+ struct dm_report_field *field,
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+ const void *data,
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+ void *private __attribute__((unused)))
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+{
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+ struct logical_volume *lv = (struct logical_volume *) data;
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+ uint32_t bs = 0;
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+
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+ if (lv_is_writecache(lv)) {
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+ struct lv_segment *seg = first_seg(lv);
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+ bs = seg->writecache_block_size;
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+ }
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+
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+ if (!bs)
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+ return dm_report_field_int32(rh, field, &GET_TYPE_RESERVED_VALUE(num_undef_32));
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+
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+ return dm_report_field_uint32(rh, field, &bs);
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+}
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+
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static int _datapercent_disp(struct dm_report *rh, struct dm_pool *mem,
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struct dm_report_field *field,
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const void *data, void *private)
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diff --git a/man/lvmcache.7_main b/man/lvmcache.7_main
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index 73680235b..519e352cb 100644
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--- a/man/lvmcache.7_main
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+++ b/man/lvmcache.7_main
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@@ -241,6 +241,10 @@ It is also possible to specify a sector size of 4096 to mkfs.xfs when
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creating the file system. In this case the writecache block size of 4096
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can be used.
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.P
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+The writecache block size is displayed by the command:
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+.br
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+lvs -o writecacheblocksize VG/LV
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+.P
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.SS dm-writecache memory usage
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.P
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The amount of main system memory used by dm-writecache can be a factor
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diff --git a/test/shell/writecache-cache-blocksize.sh b/test/shell/writecache-cache-blocksize.sh
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index 2579ef7b7..4e17effe5 100644
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--- a/test/shell/writecache-cache-blocksize.sh
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+++ b/test/shell/writecache-cache-blocksize.sh
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@@ -222,6 +222,8 @@ vgextend $vg "$dev2"
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lvcreate -n $lv1 -l 8 -an $vg "$dev1"
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lvcreate -n $lv2 -l 4 -an $vg "$dev2"
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lvconvert --yes --type writecache --cachevol $lv2 --cachesettings "block_size=4096" $vg/$lv1
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+lvs -o writecacheblocksize $vg/$lv1 |tee out
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+grep 4096 out
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lvchange -ay $vg/$lv1
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mkfs.xfs -f "$DM_DEV_DIR/$vg/$lv1" |tee out
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grep "sectsz=4096" out
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--
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2.34.3
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