Conecto um disco rígido externo ao meu laptop. Eu tento descobrir as informações
$ udevadm info -a -n /dev/sdb
Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.
looking at device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0/10:0:0:0/block/sdb':
KERNEL=="sdb"
SUBSYSTEM=="block"
DRIVER==""
ATTR{range}=="16"
ATTR{ext_range}=="256"
ATTR{removable}=="0"
ATTR{ro}=="0"
ATTR{size}=="312581808"
ATTR{alignment_offset}=="0"
ATTR{discard_alignment}=="0"
ATTR{capability}=="50"
ATTR{stat}==" 322 11207 13259 2196 2 0 16 0 0 1524 2196"
ATTR{inflight}==" 0 0"
ATTR{events}==""
ATTR{events_async}==""
ATTR{events_poll_msecs}=="-1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0/10:0:0:0':
KERNELS=="10:0:0:0"
SUBSYSTEMS=="scsi"
DRIVERS=="sd"
ATTRS{device_blocked}=="0"
ATTRS{type}=="0"
ATTRS{scsi_level}=="0"
ATTRS{vendor}=="USB 2.0 "
ATTRS{model}=="Storage Device "
ATTRS{rev}=="0100"
ATTRS{state}=="running"
ATTRS{timeout}=="30"
ATTRS{iocounterbits}=="32"
ATTRS{iorequest_cnt}=="0x165"
ATTRS{iodone_cnt}=="0x165"
ATTRS{ioerr_cnt}=="0x2"
ATTRS{evt_media_change}=="0"
ATTRS{dh_state}=="detached"
ATTRS{queue_depth}=="1"
ATTRS{queue_type}=="none"
ATTRS{max_sectors}=="240"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10/target10:0:0':
KERNELS=="target10:0:0"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0/host10':
KERNELS=="host10"
SUBSYSTEMS=="scsi"
DRIVERS==""
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:1.0':
KERNELS=="2-1:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="usb-storage"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="02"
ATTRS{bInterfaceClass}=="08"
ATTRS{bInterfaceSubClass}=="06"
ATTRS{bInterfaceProtocol}=="50"
ATTRS{supports_autosuspend}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2/2-1':
KERNELS=="2-1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="c0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="1076"
ATTRS{idVendor}=="0402"
ATTRS{idProduct}=="5621"
ATTRS{bcdDevice}=="0103"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="2"
ATTRS{devnum}=="8"
ATTRS{devpath}=="1"
ATTRS{product}=="USB 2.0 Storage Device"
ATTRS{serial}=="00042222200000064007"
looking at parent device '/devices/pci0000:00/0000:00:1d.7/usb2':
KERNELS=="usb2"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="e0"
ATTRS{bMaxPower}==" 0mA"
ATTRS{urbnum}=="382"
ATTRS{idVendor}=="1d6b"
ATTRS{idProduct}=="0002"
ATTRS{bcdDevice}=="0302"
ATTRS{bDeviceClass}=="09"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="480"
ATTRS{busnum}=="2"
ATTRS{devnum}=="1"
ATTRS{devpath}=="0"
ATTRS{version}==" 2.00"
ATTRS{maxchild}=="6"
ATTRS{quirks}=="0x0"
ATTRS{avoid_reset_quirk}=="0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Linux 3.2.0-27-generic-pae ehci_hcd"
ATTRS{product}=="EHCI Host Controller"
ATTRS{serial}=="0000:00:1d.7"
ATTRS{authorized_default}=="1"
looking at parent device '/devices/pci0000:00/0000:00:1d.7':
KERNELS=="0000:00:1d.7"
SUBSYSTEMS=="pci"
DRIVERS=="ehci_hcd"
ATTRS{vendor}=="0x8086"
ATTRS{device}=="0x293a"
ATTRS{subsystem_vendor}=="0x17aa"
ATTRS{subsystem_device}=="0x20f1"
ATTRS{class}=="0x0c0320"
ATTRS{irq}=="19"
ATTRS{local_cpus}=="ff"
ATTRS{local_cpulist}=="0-7"
ATTRS{dma_mask_bits}=="32"
ATTRS{consistent_dma_mask_bits}=="32"
ATTRS{broken_parity_status}=="0"
ATTRS{msi_bus}==""
ATTRS{companion}==""
ATTRS{uframe_periodic_max}=="100"
looking at parent device '/devices/pci0000:00':
KERNELS=="pci0000:00"
SUBSYSTEMS==""
DRIVERS==""
Gostaria de saber o que é "a cadeia de dispositivos pai", implícita na saída? Não entendo bem o que looking at (parent) devicesignifica seguir cada um. Por exemplo,
O primeiro é meu HDD externo? Quais são os outros?
Por que todos, exceto os dois últimos, têm "usb" dentro de '...'?
É o próximo aos últimos slots PCI?
Qual é o último que está tão vazio, apesar de ter pciem seu nome?
"Subir" significa do disco rígido externo para a CPU?
Obrigado!