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btrfs: Document a mutex lock/unlock sequence

This commit is contained in:
David Sterba 2011-05-02 15:29:25 +02:00
parent b3b4aa74b5
commit 8cc33e5c19
1 changed files with 12 additions and 0 deletions
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12
fs/btrfs/extent-tree.c
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@ -756,6 +756,10 @@ again:
btrfs_release_path(path); btrfs_release_path(path);
/*
* Mutex was contended, block until it's released and try
* again
*/
mutex_lock(&head->mutex); mutex_lock(&head->mutex);
mutex_unlock(&head->mutex); mutex_unlock(&head->mutex);
btrfs_put_delayed_ref(&head->node); btrfs_put_delayed_ref(&head->node);
@ -2297,6 +2301,10 @@ again:
atomic_inc(&ref->refs); atomic_inc(&ref->refs);
spin_unlock(&delayed_refs->lock); spin_unlock(&delayed_refs->lock);
/*
* Mutex was contended, block until it's
* released and try again
*/
mutex_lock(&head->mutex); mutex_lock(&head->mutex);
mutex_unlock(&head->mutex); mutex_unlock(&head->mutex);
@ -2363,6 +2371,10 @@ static noinline int check_delayed_ref(struct btrfs_trans_handle *trans,
btrfs_release_path(path); btrfs_release_path(path);
/*
* Mutex was contended, block until it's released and let
* caller try again
*/
mutex_lock(&head->mutex); mutex_lock(&head->mutex);
mutex_unlock(&head->mutex); mutex_unlock(&head->mutex);
btrfs_put_delayed_ref(&head->node); btrfs_put_delayed_ref(&head->node);