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Btrfs: call the ordered free operation without any locks held 

Each ordered operation has a free callback, and this was called with the
worker spinlock held.  Josef made the free callback also call iput,
which we can't do with the spinlock.

This drops the spinlock for the free operation and grabs it again before
moving through the rest of the list.  We'll circle back around to this
and find a cleaner way that doesn't bounce the lock around so much.

Signed-off-by: Chris Mason <chris.mason@fusionio.com>
cc: stable@kernel.org
This commit is contained in:
Chris Mason 2012-07-25 15:57:13 -04:00
parent 2b0ce2c290
commit e9fbcb4220
1 changed files with 8 additions and 1 deletions
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9
fs/btrfs/async-thread.c
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@ -206,10 +206,17 @@ static noinline void run_ordered_completions(struct btrfs_workers *workers,
work->ordered_func(work);
/* now take the lock again and call the freeing code */
/* now take the lock again and drop our item from the list */
spin_lock(&workers->order_lock);
list_del(&work->order_list);
spin_unlock(&workers->order_lock);
/*
* we don't want to call the ordered free functions
* with the lock held though
*/
work->ordered_free(work);
spin_lock(&workers->order_lock);
}
spin_unlock(&workers->order_lock);