mirror of
https://github.com/freebsd/freebsd-src.git
synced 2026-10-28 11:25:21 +01:00
Colin Percival
5a31987d4c
In VM and cloud environments it is often possible to enlarge virtual disks; this can be useful, for example, if a system is launched with a small root disk and it later becomes clear that more space is needed. On kernels which support run-time resizing of disks (for NVMe, this was added in November 2025; some other disk types have supported this for longer) a SIZECHANGE notification is sent to userland via devd. Add a "nostart" rc.d script (runnable manually but not automatically at boot time) and a devd script which invokes it when a notification arrives. The rc.d script enlarges the "final partition" on partitioned geoms, or the UFS filesystem or zpool device when triggered on a disk containing either of those. Reviewed by: imp, ziaee MFC after: 2 weeks Relnotes: Disk partitions and filesystems can be enlarged automatically when disks grow by setting growfs_postboot_enable=YES in /etc/rc.conf. Sponsored by: Amazon Differential Revision: https://reviews.freebsd.org/D58582