SEEK_HOLE and SEEK_DATA¶
When building a Yocto image, I came across an error:
wic.filemap.ErrorNotSupp: the file-system does not support "SEEK_HOLE" and "SEEK_DATA" but only provides a stub implementation
The relevant discussion is on github.com/openzfs/zfs#6958.
It seems that it may also be worth investigating the zfs_dmu_offset_next_sync parameter, see bmap-tools/README.
Path: /sys/module/zfs/parameters/zfs_dmu_offset_next_sync
zfs_dmu_offset_next_sync(int)¶Enable forcing txg sync to find holes. When enabled forces ZFS to act like prior versions when
SEEK_HOLEorSEEK_DATAflags are used, which when a dnode is dirty causes txg's to be synced so that this data can be found.Use 1 for yes and 0 to disable (default).