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[[!tag open_issue_gnumach open_issue_hurd]]
Also filed as [[!GNU_Savannah_bug 29292]].
\#hurd, 2010, end of May / beginning of June
[runnign sync, but sill unclean filesystem at next boot]
<slpz> guillem: when libpager syncs an object, it sends an m_o_lock_request
and waits (if the synchronous argument was specified) for a
m_o_lock_completed. But m_o_lock_completed only means that dirty pages
have been sent to the translator, and this one still needs to write them
to the backing storage
<slpz> guillem: there's no problem if sync() returns before actually
writting the changes to disk, but this also happens when shutting down
the translator
<slpz> guillem: in theory, locking mechanisms in libpager should prevent
this from happening by keeping track of write operations, but this seems
to fail in some situations
It helps a lot to run [[`syncfs --synchronous /`|hurd/syncfs]] before issuing
the `halt` or `reboot` command. This will prevent most of the uncleanliness.
Of course, [[hurd/translator/ext2fs]] is meant to be doing this to-disk
synchronization internally upon translator shutdown, but evidently it doesn't
in all cases.
Apparently diskfs simply does not set filesystems as read-only:
<http://lists.gnu.org/archive/html/bug-hurd/2011-08/msg00024.html>.
A patch was applied, and the sync issue does not seem to happen any more.
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