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...rty work (blocked=0). The second patch adds ioctls that let you start and wait for an asynchronous commit. The third introduces a SNAP_CREATE_ASYNC ioctl that creates a snap but returns before it hits disk. The fourth patch returns the commiting transid to userspace, so that it can be fed to the WAIT_SYNC ioctl. I''m not that happy with the interface, though; any suggestions for alternatives would be great. Alternatively, I could get by without knowing the exact transid and it wouldn''t be the end of the world. The final patch lets you delete a snapshot/subvol reference without do...

...nd I''m a happy camper. :) If anybody has any questions or issues with any of this, please let me know so I can revise the patches accordingly. Thanks! sage --- Sage Weil (6): Btrfs: fix deadlock in btrfs_commit_transaction Btrfs: async transaction commit Btrfs: add START_SYNC, WAIT_SYNC ioctls Btrfs: add SNAP_CREATE_ASYNC ioctl Btrfs: make SNAP_DESTROY async Btrfs: allow subvol deletion by owner fs/btrfs/ctree.h | 1 + fs/btrfs/disk-io.c | 1 + fs/btrfs/ioctl.c | 152 +++++++++++++++++++++++++++++++++++----- fs/btrfs/ioctl.h | 9 +++ fs/btrf...