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
FreeBSD Source:
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Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Source code for third-party software under the Common Development and Distribution License. |
| contrib | Source code for third-party software. |
| crypto | Source code for cryptographic libraries and commands (see crypto/README). |
| etc | Template files for /etc. |
| include | System include files. |
| kerberos5 | Build system for Kerberos 5 (Heimdal). |
| krb5 | Build system for Kerberos 5 (MIT). |
| lib | System libraries. |
| libexec | System commands intended to be executed by other commands or daemons. |
| packages | Base system packages. |
| release | Makefiles and scripts used for building releases and VM images. |
| rescue | Build system for statically linked /rescue commands. |
| sbin | System commands. |
| secure | Build system for cryptographic libraries and commands (excluding Kerberos). |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Tests which can be run by Kyua. See tests/README for additional information. |
| tools | Ancillary utilities and tests (not included in the build). |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
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