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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2015-02-18 00:58:35 +0100
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2015-02-18 00:58:35 +0100
commit49a086299e047b18280457b654790ef4a2e5abfa (patch)
treec2b29e0734d560ce4f58c6945390650b5cac8a1b /open_issues/sync_but_still_unclean_filesystem.mdwn
parente2b3602ea241cd0f6bc3db88bf055bee459028b6 (diff)
Revert "rename open_issues.mdwn to service_solahart_jakarta_selatan__082122541663.mdwn"
This reverts commit 95878586ec7611791f4001a4ee17abf943fae3c1.
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+[[!meta copyright="Copyright © 2010, 2011 Free Software Foundation, Inc."]]
+
+[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
+id="license" text="Permission is granted to copy, distribute and/or modify this
+document under the terms of the GNU Free Documentation License, Version 1.2 or
+any later version published by the Free Software Foundation; with no Invariant
+Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
+is included in the section entitled [[GNU Free Documentation
+License|/fdl]]."]]"""]]
+
+[[!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.