JOURNAL_LOCK_UPDATES - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : The Linux Journalling API

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NAMEjournal_lock_updates − establish a transaction barrier​.

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SYNOPSISvoid journal_lock_updates(journal_t * journal);

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ARGUMENTSjournal Journal to establish a barrier on​.

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DESCRIPTIONThis locks out any further updates from being started, and blocks until all existing updates have completed, returning only once the journal is in a quiescent state with no updates running​. We do not use simple mutex for synchronization as there are syscalls which want to return with filesystem locked and that trips up lockdep​. Also hibernate needs to lock filesystem but locked mutex then blocks hibernation​. Since locking filesystem is rare operation, we use simple counter and waitqueue for locking​.

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AUTHORSRoger Gammans <​rgammans@computer-surgery.co.uk​> Author. Stephen Tweedie <​sct@redhat.com​> Author.

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