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docs(agent): explain btrfs ioctl fallback incomplete-probe semantics

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henrygd
2026-10-13 10:32:59 -04:00
parent 01b9b03d67
commit 9b40b62ec8
1 changed files with 5 additions and 1 deletions
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agent/btrfs/btrfs_linux.go
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@@ -195,7 +195,11 @@ func (fs *Filesystem) readDevicesIoctl(mountpoint string, attached int) (capacit
members = append(members, member)
}
if probed != info.numDevices {
return false, false // a device appeared or vanished mid-probe
// A device appeared or vanished mid-probe, or a replace is running
// (old kernels count the devid 0 target, which is never probed).
// A member already confirmed missing keeps DEGRADED, matching the
// sysfs path where missing evidence outranks an incomplete read.
return false, false
}
// The kernel counts missing members too, so a number above the sysfs
// devices count means one is missing even if no path proved it. Members