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writecache: display block size from lvs

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lvs was missing the ability to display writecache block size.
now possible with lvs -o writecache_block_size
This commit is contained in:
David Teigland 2022-02-21 16:09:57 -06:00
parent 6144dac897
commit ac1f4bbbfd
5 changed files with 29 additions and 0 deletions
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1
lib/report/columns.h
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@ -108,6 +108,7 @@ FIELD(LVS, lv, TIM, "RTime", lvid, 26, lvtimeremoved, lv_time_removed, "Removal
FIELD(LVS, lv, STR, "Host", lvid, 10, lvhost, lv_host, "Creation host of the LV, if known.", 0) FIELD(LVS, lv, STR, "Host", lvid, 10, lvhost, lv_host, "Creation host of the LV, if known.", 0)
FIELD(LVS, lv, STR_LIST, "Modules", lvid, 0, modules, lv_modules, "Kernel device-mapper modules required for this LV.", 0) FIELD(LVS, lv, STR_LIST, "Modules", lvid, 0, modules, lv_modules, "Kernel device-mapper modules required for this LV.", 0)
FIELD(LVS, lv, BIN, "Historical", lvid, 0, lvhistorical, lv_historical, "Set if the LV is historical.", 0) FIELD(LVS, lv, BIN, "Historical", lvid, 0, lvhistorical, lv_historical, "Set if the LV is historical.", 0)
FIELD(LVS, lv, NUM, "WCacheBlkSize", lvid, 0, writecache_block_size, writecache_block_size, "The writecache block size", 0)
/* /*
* End of LVS type fields * End of LVS type fields
*/ */

2
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)
#define _writecache_writeback_blocks_get prop_not_implemented_get #define _writecache_writeback_blocks_get prop_not_implemented_get
#define _writecache_error_set prop_not_implemented_set #define _writecache_error_set prop_not_implemented_set
#define _writecache_error_get prop_not_implemented_get #define _writecache_error_get prop_not_implemented_get
#define _writecache_block_size_set prop_not_implemented_set
#define _writecache_block_size_get prop_not_implemented_get
#define _vdo_operating_mode_set prop_not_implemented_set #define _vdo_operating_mode_set prop_not_implemented_set
#define _vdo_operating_mode_get prop_not_implemented_get #define _vdo_operating_mode_get prop_not_implemented_get

20
lib/report/report.c
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@ -3346,6 +3346,26 @@ static int _integritymismatches_disp(struct dm_report *rh __attribute__((unused)
return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64)); return _field_set_value(field, "", &GET_TYPE_RESERVED_VALUE(num_undef_64));
} }
static int _writecache_block_size_disp(struct dm_report *rh __attribute__((unused)),
struct dm_pool *mem,
struct dm_report_field *field,
const void *data,
void *private __attribute__((unused)))
{
struct logical_volume *lv = (struct logical_volume *) data;
uint32_t bs = 0;
if (lv_is_writecache(lv)) {
struct lv_segment *seg = first_seg(lv);
bs = seg->writecache_block_size;
}
if (!bs)
return dm_report_field_int32(rh, field, &GET_TYPE_RESERVED_VALUE(num_undef_32));
return dm_report_field_uint32(rh, field, &bs);
}
static int _datapercent_disp(struct dm_report *rh, struct dm_pool *mem, static int _datapercent_disp(struct dm_report *rh, struct dm_pool *mem,
struct dm_report_field *field, struct dm_report_field *field,
const void *data, void *private) const void *data, void *private)

4
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
creating the file system. In this case the writecache block size of 4096 creating the file system. In this case the writecache block size of 4096
can be used. can be used.
.P .P
The writecache block size is displayed by the command:
.br
lvs -o writecacheblocksize VG/LV
.P
.SS dm-writecache memory usage .SS dm-writecache memory usage
.P .P
The amount of main system memory used by dm-writecache can be a factor The amount of main system memory used by dm-writecache can be a factor

2
test/shell/writecache-cache-blocksize.sh
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@ -222,6 +222,8 @@ vgextend $vg "$dev2"
lvcreate -n $lv1 -l 8 -an $vg "$dev1" lvcreate -n $lv1 -l 8 -an $vg "$dev1"
lvcreate -n $lv2 -l 4 -an $vg "$dev2" lvcreate -n $lv2 -l 4 -an $vg "$dev2"
lvconvert --yes --type writecache --cachevol $lv2 --cachesettings "block_size=4096" $vg/$lv1 lvconvert --yes --type writecache --cachevol $lv2 --cachesettings "block_size=4096" $vg/$lv1
lvs -o writecacheblocksize $vg/$lv1 |tee out
grep 4096 out
lvchange -ay $vg/$lv1 lvchange -ay $vg/$lv1
mkfs.xfs -f "$DM_DEV_DIR/$vg/$lv1" |tee out mkfs.xfs -f "$DM_DEV_DIR/$vg/$lv1" |tee out
grep "sectsz=4096" out grep "sectsz=4096" out