tree 0ea50b2b07a9f75988829de6c42b6936e2355545
parent df98b6e2c52f65665eaf0fc23e647fb64335b289
author Josef Bacik <josef@redhat.com> 1309459348 -0400
committer Chris Mason <chris.mason@oracle.com> 1311785185 -0400

Btrfs: use a worker thread to do caching

A user reported a deadlock when copying a bunch of files.  This is because they
were low on memory and kthreadd got hung up trying to migrate pages for an
allocation when starting the caching kthread.  The page was locked by the person
starting the caching kthread.  To fix this we just need to use the async thread
stuff so that the threads are already created and we don't have to worry about
deadlocks.  Thanks,

Reported-by: Roman Mamedov <rm@romanrm.ru>
Signed-off-by: Josef Bacik <josef@redhat.com>