btrfs: check for exit condition after waking in wait_log_commit()

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We check for the exit condition after we add ourselves to the wait queue
and before we unlock the root's log_mutex, sleep and lock again log_mutex.
This is not incorrect, but it's not optimal since in the first iteration
this is pointless because we already know that root->log_commit[index] is
not zero, so we should check the exit condition only after unlocking
log_mutex, sleeping, waking up and locking again the log_mutex.

So move the check for the exit condition to bottom of the loop, after we
were woken and locked log_mutex again.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Filipe Manana 2026-07-16 15:27:34 +01:00 • committed by David Sterba

parent 31ffb32245

commit 3ccdd23e9f

1 changed files with 4 additions and 4 deletions

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fs/btrfs/tree-log.c

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