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overlay: Enable character device to be the base fs partition

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When running overlay tests using character devices as base fs partitions,
all overlay usecase results become 'notrun'. Function
'_overay_config_override' (common/config) detects that the current base
fs partition is not a block device and will set FSTYP to base fs. The
overlay usecase will check the current FSTYP, and if it is not 'overlay'
or 'generic', it will skip the execution.

For example, using UBIFS as base fs skips all overlay usecases:

  FSTYP         -- ubifs       # FSTYP should be overridden as 'overlay'
  MKFS_OPTIONS  -- /dev/ubi0_1 # Character device
  MOUNT_OPTIONS -- -t ubifs /dev/ubi0_1 /tmp/scratch

  overlay/001	[not run] not suitable for this filesystem type: ubifs
  overlay/002	[not run] not suitable for this filesystem type: ubifs
  overlay/003	[not run] not suitable for this filesystem type: ubifs

When checking that the base fs partition is a block/character device,
FSTYP is overwritten as 'overlay'. This patch allows the base fs
partition to be a character device that can also execute overlay
usecases (such as ubifs).

Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
This commit is contained in:
Zhihao Cheng
2019-09-25 14:35:33 +08:00
committed by Eryu Guan
parent 0fd43f3f4b
commit 4cec72bb16
2 changed files with 4 additions and 4 deletions
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common/config
+3 -3
View File
@@ -532,7 +532,7 @@ _canonicalize_mountpoint()
# When SCRATCH/TEST_* vars are defined in evironment and not
# in config file, this function is called after vars have already
# been overriden in the previous test.
# In that case, TEST_DEV is a directory and not a blockdev and
# In that case, TEST_DEV is a directory and not a blockdev/chardev and
# the function will return without overriding the SCRATCH/TEST_* vars.
_overlay_config_override()
{
@@ -550,7 +550,7 @@ _overlay_config_override()
# the new OVL_BASE_SCRATCH/TEST_DEV/MNT vars are set to the values
# of the configured base fs and SCRATCH/TEST_DEV vars are set to the
# overlayfs base and mount dirs inside base fs mount.
[ -b "$TEST_DEV" ] || return 0
[ -b "$TEST_DEV" ] || [ -c "$TEST_DEV" ] || return 0
# Config file may specify base fs type, but we obay -overlay flag
[ "$FSTYP" == overlay ] || export OVL_BASE_FSTYP="$FSTYP"
@@ -570,7 +570,7 @@ _overlay_config_override()
export TEST_DIR="$OVL_BASE_TEST_DIR/$OVL_MNT"
export MOUNT_OPTIONS="$OVERLAY_MOUNT_OPTIONS"
[ -b "$SCRATCH_DEV" ] || return 0
[ -b "$SCRATCH_DEV" ] || [ -c "$SCRATCH_DEV" ] || return 0
# Store original base fs vars
export OVL_BASE_SCRATCH_DEV="$SCRATCH_DEV"
common/rc
+1 -1
View File
@@ -3100,7 +3100,7 @@ _require_scratch_shutdown()
# SCRATCH_DEV, in this case OVL_BASE_SCRATCH_DEV
# will be null, so check OVL_BASE_SCRATCH_DEV before
# running shutdown to avoid shutting down base fs accidently.
_notrun "$SCRATCH_DEV is not a block device"
_notrun "This test requires a valid $OVL_BASE_SCRATCH_DEV as ovl base fs"
else
src/godown -f $OVL_BASE_SCRATCH_MNT 2>&1 \
|| _notrun "Underlying filesystem does not support shutdown"