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writecache: let block_size setting override device block sizes

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In cases where lvconvert does not detect a fs block size on the
device, it falls back to choosing a writecache block size based
on the device's LBS and PBS (tries to match those.)

If the user specifies a writecache block size on the command
line (--cachesettings block_size=4096|512), lvconvert currently
fails and reports an error if the user-specified value does not
match the value lvconvert would have chosen based on LBS and PBS.

The purpose of allowing a user-specified value on the command line
is to override what lvconvert would otherwise do, so change this
to just print a warning that the user value does not match the
value that would be chosen based on the LBS/PBS, and then take
the user-specified value as the writecache block size.
This commit is contained in:
David Teigland 2021-01-12 14:41:38 -06:00
parent bee9f4efdd
commit 8454ce66c5
2 changed files with 41 additions and 3 deletions
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38
test/shell/writecache-blocksize.sh
View File

@ -184,3 +184,41 @@ _check_env "4096" "4096"
_run_test 4096 ""
aux cleanup_scsi_debug_dev
# scsi_debug devices with 512 LBS 512 PBS
aux prepare_scsi_debug_dev 256 || skip
aux prepare_devs 2 64
_check_env "512" "512"
vgcreate $SHARED $vg "$dev1"
vgextend $vg "$dev2"
lvcreate -n $lv1 -l 8 -an $vg "$dev1"
lvcreate -n $lv2 -l 4 -an $vg "$dev2"
lvconvert --yes --type writecache --cachevol $lv2 --cachesettings "block_size=4096" $vg/$lv1
lvchange -ay $vg/$lv1
mkfs.xfs -f "$DM_DEV_DIR/$vg/$lv1" |tee out
grep "sectsz=4096" out
_add_new_data_to_mnt
blockdev --getss "$DM_DEV_DIR/$vg/$lv1" |tee out
grep 4096 out
blockdev --getpbsz "$DM_DEV_DIR/$vg/$lv1"
_add_more_data_to_mnt
_verify_data_on_mnt
lvconvert --splitcache $vg/$lv1
check lv_field $vg/$lv1 segtype linear
check lv_field $vg/$lv2 segtype linear
blockdev --getss "$DM_DEV_DIR/$vg/$lv1"
blockdev --getpbsz "$DM_DEV_DIR/$vg/$lv1"
_verify_data_on_mnt
_verify_more_data_on_mnt
umount $mnt
lvchange -an $vg/$lv1
lvchange -an $vg/$lv2
_verify_data_on_lv
lvremove $vg/$lv1
lvremove $vg/$lv2
vgremove $vg
aux cleanup_scsi_debug_dev

4
tools/lvconvert.c
View File

@ -6015,9 +6015,9 @@ skip_fs:
}
if (block_size_setting && (block_size_setting != block_size)) {
log_error("Cannot use writecache block size %u with unknown file system block size, logical block size %u, physical block size %u.",
log_warn("WARNING: writecache block size %u does not match device block sizes, logical %u physical %u",
block_size_setting, lbs_4k ? 4096 : 512, pbs_4k ? 4096 : 512);
goto bad;
block_size = block_size_setting;
}
if (block_size != 512) {