incusd/storage/drivers/common: Truncate/Discard ahead of sparse write #3278

Job	Run time
Code (oldstable)	7m 40s
Code (stable)	7m 56s
Code (tip)	10m 43s
Client (oldstable, ubuntu-latest)	1m 6s
Client (oldstable, macos-latest)	54s
Documentation	6m 40s
Client (oldstable, windows-latest)	1m 21s
System (stable, cluster, dir)	15m 25s
Client (stable, ubuntu-latest)	1m 11s
System (stable, cluster, btrfs)	12m 28s
Client (stable, macos-latest)	1m 4s
System (stable, cluster, lvm)	13m 17s
Client (stable, windows-latest)	2m 20s
System (stable, cluster, zfs)	12m 48s
System (stable, cluster, ceph)	17m 37s
System (stable, cluster, random)	11m 57s
System (stable, standalone, dir)	22m 48s
System (stable, standalone, btrfs)	22m 38s
System (stable, standalone, lvm)	40m 3s
System (stable, standalone, zfs)	38m 30s
System (stable, standalone, ceph)	1h 17m 19s
System (stable, standalone, random)	30m 38s
System (oldstable, cluster, dir)	11m 52s
System (oldstable, standalone, dir)	22m 51s
System (tip, cluster, dir)	14m 52s
System (tip, standalone, dir)	26m 30s
	7h 12m 28s

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