src/sys/dev/md, branch main

vm_object: remove the charge member

2026-01-13T14:03:14Z

State that the object charge is zero if object->cred == NULL, or equal to the ptoa(object->size) otherwise. Besides being much simpler, the transition to use object->size corrects the architectural issue with the use of object->charge. The split operations effectively carve the holes in the charged regions, but single counter cannot properly express it. As result, coalescing anonymous mappings cannot calculate correctly if the extended mapping already backed by the existing object is already accounted or not [1]. To properly solve the issue, either we need to start tracking exact charged regions in the anonymous objects, which has the significant overhead and complications. Or give up on the slight over-accounting and charge the whole object unconditionally, as it is done in the patch. Reported by: mmel, pho [1] Reviewed by: markj Tested by: pho Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D54572

sys/dev/md: cleanup includes

2025-10-28T18:52:06Z

Remove twice included but unneeded explicit sys/param.h. Sort. Sponsored by: The FreeBSD Foundation MFC after: 3 days

biosboot: Detect memory disks from PXE

2025-07-23T00:10:25Z

Walk through the disk driver entries chained off of INT13. MEMDISK is part of the Syslinux project; it loads disk images into memory, sets an int 13h hook and then does a BIOS boot from the image; this can be used as part of a PXE boot environment to load installer disks, however the disks are not accessible from inside the FreeBSD kernel because it doesn't access disks through BIOS APIs. This patch detects the disk images in the loader, and passes their address and length as a driver hint. When the md driver sees the hint, it maps the image, and presents it to the system. (rebased and reworked from https://reviews.freebsd.org/D27349) Feedback from: kib, bapt, olce Differential Revision: https://reviews.freebsd.org/D45404

md(4): Stop symlinking vn.4 to md.4

2025-07-16T14:23:41Z

We've done the same in the past to the vnconfig.8->mdconfig.8 link in: eb5f4569819 Remove ancient vnconfig symlink Reviewed by: bcr, markj, ziaee Approved by: markj (mentor) MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D27122

md: Restore guards in mddestroy()

2025-07-03T15:10:41Z

mddestroy() may be invoked on a partially constructed md device. Restore the guards that handled this prior to commit e91022168101. Reported by: syzbot+a0ff73f664de8757cfaa@syzkaller.appspotmail.com Reported by: syzbot+7b4a4824bf81548283ab@syzkaller.appspotmail.com Reviewed by: kib Fixes: e91022168101 ("md(4): move type-specific data under union") Differential Revision: https://reviews.freebsd.org/D51145

md(4): move type-specific data under union

2025-07-02T15:32:58Z

This way it is clear which type uses which members. Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D51127

md: Use a larger buffer for the ident string

2025-06-25T21:20:45Z

With the old size, the string could easily be truncated, resulting in non-unique identifiers. PR: 287679 Reported by: Phil Krylov Reviewed by: kib MFC after: 2 weeks

md: Fix linking of embedded filesystem images on aarch64

2024-11-21T18:36:37Z

embedfs.S needs the right aarch64 features for BTI and/or PAC. Obtained from: CheriBSD Fixes: c2e0d56f5e49 ("arm64: Support BTI checking in most of the kernel") Sponsored by: AFRL, DARPA

md(4): always trim the last partial sector

2024-10-14T08:08:21Z

Do it also for the preloaded disk, in addition to the dynamically configured device. This is needed to avoid geom checking alignment and panicing on read of the last sector, e.g. for partition schemes and label tasting. PR: 281978 Reported by: bz Reviewed by: bz, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D47102

md: round-trip the MUSTDEALLOC and RESERVE options

2024-06-01T18:40:19Z

If those options are requested when the device is created, ensure that they will be reported by MDIOCQUERY. MFC after: 2 weeks Reviewed by: imp Pull Request: https://github.com/freebsd/freebsd-src/pull/1270