diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/dmthin | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/common/dmthin b/common/dmthin index 3b1c7d45..91147e47 100644 --- a/common/dmthin +++ b/common/dmthin @@ -113,8 +113,12 @@ _dmthin_init() _dmsetup_create $DMTHIN_DATA_NAME --table "$DMTHIN_DATA_TABLE" || \ _fatal "failed to create dm thin data device" - # Zap the pool metadata dev - dd if=/dev/zero of=$DMTHIN_META_DEV bs=4096 count=1 &>/dev/null + # Zap the pool metadata dev. Explicitly fsync the zeroes to disk + # because a slow-running udev running concurrently with dd can maintain + # an open file descriptor. The block layer only flushes the page cache + # on last close, which means that the thin pool creation below will + # see the (stale) ondisk contents and fail. + dd if=/dev/zero of=$DMTHIN_META_DEV bs=4096 count=1 conv=fsync &>/dev/null # Thin pool # "start length thin-pool metadata_dev data_dev data_block_size low_water_mark" |