获取lvs的pids / locks-dmsetup信息上的opencount的来源

问题描述

# dmsetup info 

Name:              ubuntu--vg-root
State:             ACTIVE
Read Ahead:        256 <---- 
Tables present:    LIVE
Open count:        1 <--- # how / from where are we getting this value 
Event number:      0
Major,minor:      253,0
Number of targets: 1
UUID: LVM-cNOV7zcldgzsAuxUbXbSdk2WhT012Pjay1B0JmoKCcTFOQDa9u19bDkqkdceVY0a

• 我想弄清楚dmsetup信息从何处获得计数，我真的很想弄清楚，运行了一个跟踪但无法分辨

• 我也看到/ sys / dev / block / 253：0 / bdi / read_ahead_kb上的预读值128，但是dmsetup info显示256。这不是不一致的吗？我在这里想念什么吗？

  open("/sys/dev/block/253:0/bdi/read_ahead_kb",O_RDONLY) = 4
  read(4,"128\n",23)                    = 4
  close(4)                                = 0
  write(1,"Read Ahead:        256\n",23Read Ahead:        256
  ) = 23
  write(1,"Tables present:    LIVE\n",24Tables present:    LIVE
  ) = 24
  write(1,"Open count:        1\n",21Open count:        1
  )  = 21
  write(1,"Event number:      0\n",21Event number:      0
  )  = 21
  write(1,"Major,0\n",26Major,0
  ) = 26
  write(1,"Number of targets: 1\n",21Number of targets: 1
  )  = 21
  write(1,"UUID: LVM-cNOV7zcldgzsAuxUbXbSdk"...,75UUID: LVM-cNOV7zcldgzsAuxUbXbSdk2WhT012Pjay1B0JmoKCcTFOQDa9u19bDkqkdceVY0a
  ) = 75
  write(1,"\n",1
  )                       = 1
  

  关闭（3）= 0 exit_group（0）=？ +++以0退出+++ root @ dockserver：/ sys / dev / block / 253：0 / dm＃cat / sys / dev / block / 253：0 / bdi / read_ahead_kb 128 root @ dockserver：/ sys / dev / block / 253：0 / dm＃

解决方法

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