remount Read-Only = Device busy

Miroslav Lachman 000.fbsd at quip.cz
Sun Dec 6 20:18:51 CET 2009


Dan Lukes wrote:
> Miroslav Lachman napsal/wrote, On 09/16/09 15:56:
[...]
> Pripada mi, ze fstat ma v patem sloupci uvedeny mountpoint a v poslednim
> typ otevreni - takze ty hledas radky, ktere konci 'rw' a maji zkoumany
> mountpoint.
>
> Mimochodem, manualova stranka od fstat, pasaz tykajici se popisu R/W
> sloupce jako by z oka vypadla odpovedi na tvuj dotaz ;-)

Tak jsem tu opet se stejnym problemem na stejnem stroji - po remountu 
root oddilu pro zapis a provedeni aktualizace systemu a portu se mi 
nedari remount zpet na Read-Only. Pritom fstat ani lsof nevypisuje zadny 
otevreny soubor pro zapis z tohoto oddilu.

Root lezi na USB flashdisku a bootuje se z neho system FreeBSD 7.2 amd64 
v rezimu pouze pro cteni, ostatni oddily jsou na ZFS ze 4 HDD.

# mount -t ufs
/dev/ufs/2gLive on / (ufs, local)

# mount -r /
mount:  : Device busy

# mount -u -o current,ro /
mount: /dev/ufs/2gLive : Device busy


Kompletni seznam otevrenych souboru z root oddilu - "/" (nevidim tam 
zadny otevreny pro zapis)

# fstat | awk '$5 == "/" { print $0 }'
root     awk        65418 root /             2 drwxr-xr-x     512  r
root     awk        65418   wd /         47105 drwxr-xr-x    1024  r
root     awk        65418 text /        145867 -r-xr-xr-x  136360  r
root     fstat      65417 root /             2 drwxr-xr-x     512  r
root     fstat      65417   wd /         47105 drwxr-xr-x    1024  r
root     fstat      65417 text /        146160 -r-xr-sr-x   20448  r
root     fstat      65417    5 /         47174 -rw-------   40960  r
root     tcsh       30297 root /             2 drwxr-xr-x     512  r
root     tcsh       30297   wd /         47105 drwxr-xr-x    1024  r
root     tcsh       30297 text /        188419 -r-xr-xr-x  354664  r
root     screen     30295 root /             2 drwxr-xr-x     512  r
root     screen     30295   wd /         47105 drwxr-xr-x    1024  r
root     screen     30295 text /        188624 -rwsr-xr-x  329808  r
root     screen     30295    6 /         47471 -rw-r--r--   13043  r
root     screen     30294 root /             2 drwxr-xr-x     512  r
root     screen     30294   wd /         47105 drwxr-xr-x    1024  r
root     screen     30294 text /        188624 -rwsr-xr-x  329808  r
root     tcsh       30271 root /             2 drwxr-xr-x     512  r
root     tcsh       30271   wd /         47105 drwxr-xr-x    1024  r
root     tcsh       30271 text /        188419 -r-xr-xr-x  354664  r
root     su         30270 root /             2 drwxr-xr-x     512  r
root     su         30270   wd /        188456 drwx------     512  r
root     su         30270 text /        145888 -r-sr-xr-x   16936  r
quip     tcsh       30264 root /             2 drwxr-xr-x     512  r
quip     tcsh       30264   wd /        188456 drwx------     512  r
quip     tcsh       30264 text /        188419 -r-xr-xr-x  354664  r
quip     sshd       30262 root /             2 drwxr-xr-x     512  r
quip     sshd       30262   wd /             2 drwxr-xr-x     512  r
quip     sshd       30262 text /        145093 -r-xr-xr-x  243248  r
root     sshd       30260 root /             2 drwxr-xr-x     512  r
root     sshd       30260   wd /             2 drwxr-xr-x     512  r
root     sshd       30260 text /        145093 -r-xr-xr-x  243248  r
root     getty      44523 root /             2 drwxr-xr-x     512  r
root     getty      44523   wd /             2 drwxr-xr-x     512  r
root     getty      44523 text /        145147 -r-xr-xr-x   27752  r
root     getty        754 root /             2 drwxr-xr-x     512  r
root     getty        754   wd /             2 drwxr-xr-x     512  r
root     getty        754 text /        145147 -r-xr-xr-x   27752  r
root     getty        753 root /             2 drwxr-xr-x     512  r
root     getty        753   wd /             2 drwxr-xr-x     512  r
root     getty        753 text /        145147 -r-xr-xr-x   27752  r
root     getty        752 root /             2 drwxr-xr-x     512  r
root     getty        752   wd /             2 drwxr-xr-x     512  r
root     getty        752 text /        145147 -r-xr-xr-x   27752  r
root     getty        751 root /             2 drwxr-xr-x     512  r
root     getty        751   wd /             2 drwxr-xr-x     512  r
root     getty        751 text /        145147 -r-xr-xr-x   27752  r
root     getty        750 root /             2 drwxr-xr-x     512  r
root     getty        750   wd /             2 drwxr-xr-x     512  r
root     getty        750 text /        145147 -r-xr-xr-x   27752  r
root     getty        749 root /             2 drwxr-xr-x     512  r
root     getty        749   wd /             2 drwxr-xr-x     512  r
root     getty        749 text /        145147 -r-xr-xr-x   27752  r
root     getty        748 root /             2 drwxr-xr-x     512  r
root     getty        748   wd /             2 drwxr-xr-x     512  r
root     getty        748 text /        145147 -r-xr-xr-x   27752  r
root     cron         707 root /             2 drwxr-xr-x     512  r
root     cron         707 text /        144953 -r-xr-xr-x   39176  r
smmsp    sendmail     700 root /             2 drwxr-xr-x     512  r
smmsp    sendmail     700 text /        145163 -r-xr-sr-x  685440  r
root     sendmail     696 root /             2 drwxr-xr-x     512  r
root     sendmail     696 text /        145163 -r-xr-sr-x  685440  r
root     sshd         690 root /             2 drwxr-xr-x     512  r
root     sshd         690   wd /             2 drwxr-xr-x     512  r
root     sshd         690 text /        145093 -r-xr-xr-x  243248  r
root     ntpd         652 root /             2 drwxr-xr-x     512  r
root     ntpd         652   wd /             2 drwxr-xr-x     512  r
root     ntpd         652 text /        145038 -r-xr-xr-x  377328  r
root     smartd       621 root /             2 drwxr-xr-x     512  r
root     smartd       621   wd /             2 drwxr-xr-x     512  r
root     smartd       621 text /        190426 -r-xr-xr-x  248784  r
root     syslogd      541 root /             2 drwxr-xr-x     512  r
root     syslogd      541   wd /             2 drwxr-xr-x     512  r
root     syslogd      541 text /        145068 -r-xr-xr-x   39080  r
root     devd         485 root /             2 drwxr-xr-x     512  r
root     devd         485   wd /             2 drwxr-xr-x     512  r
root     devd         485 text /         70668 -r-xr-xr-x  403368  r
root     moused       437 root /             2 drwxr-xr-x     512  r
root     moused       437   wd /             2 drwxr-xr-x     512  r
root     moused       437 text /        145024 -r-xr-xr-x   39792  r
root     init           1 root /             2 drwxr-xr-x     512  r
root     init           1   wd /             2 drwxr-xr-x     512  r
root     init           1 text /         70687 -r-xr-xr-x  710168  r

Co tedy jeste muze zpusobovat nemoznost remountu Read-Only?

Mirek


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