• Zheng Yan's avatar
    Btrfs: extent_map and data=ordered fixes for space balancing · 5b21f2ed
    Zheng Yan authored
    
    
    * Add an EXTENT_BOUNDARY state bit to keep the writepage code
    from merging data extents that are in the process of being
    relocated.  This allows us to do accounting for them properly.
    
    * The balancing code relocates data extents indepdent of the underlying
    inode.  The extent_map code was modified to properly account for
    things moving around (invalidating extent_map caches in the inode).
    
    * Don't take the drop_mutex in the create_subvol ioctl.  It isn't
    required.
    
    * Fix walking of the ordered extent list to avoid races with sys_unlink
    
    * Change the lock ordering rules.  Transaction start goes outside
    the drop_mutex.  This allows btrfs_commit_transaction to directly
    drop the relocation trees.
    Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
    5b21f2ed