tree ecbc7205618940bbba3f0d9ad000462a5364f763
parent 93a54bc4c28a125978cddbe2db9e347391e3522d
author Josef Bacik <josef@redhat.com> 1302551129 -0400
committer Josef Bacik <josef@redhat.com> 1302569032 -0400

Btrfs: avoid taking the trans_mutex in btrfs_end_transaction

I've been working on making our O_DIRECT latency not suck and I noticed we were
taking the trans_mutex in btrfs_end_transaction.  So to do this we convert
num_writers and use_count to atomic_t's and just decrement them in
btrfs_end_transaction.  Instead of deleting the transaction from the trans list
in put_transaction we do that in btrfs_commit_transaction() since that's the
only time it actually needs to be removed from the list.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>