On 5/2/11 7:30 AM, Surbhi Palande wrote:
...
> Yes, but ext4_freeze() also calls jbd2_journal_unlock_updates(journal) which decrements the j_barrier_count (which was previously updated/incremented in jbd2_journal_lock_updates) ? before it returns. So after this call a new transaction/handle can be accepted/started.
>
> A comment in ext4_freeze() says:
> /* we rely on s_frozen to stop further updates */
> (before calling jbd2_journal_unlock_updates())
that was me;
commit 6b0310fbf087ad6e9e3b8392adca97cd77184084
Author: Eric Sandeen <sandeen@xxxxxxxxxx>
Date: Sun May 16 02:00:00 2010 -0400
ext4: don't return to userspace after freezing the fs with a mutex held
otherwise we return to userspace holding a mutex :(
-Eric
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