• Josef Bacik's avatar
    Btrfs: fix free space accounting when unpinning extents · 07103a3c
    Josef Bacik authored
    This patch fixes what I hope is the last early ENOSPC bug left.  I did not know
    that pinned extents would merge into one big extent when inserted on to the
    pinned extent tree, so I was adding free space to a block group that could
    possibly span multiple block groups.
    
    This is a big issue because first that space doesn't exist in that block group,
    and second we won't actually use that space because there are a bunch of other
    checks to make sure we're allocating within the constraints of the block group.
    
    This patch fixes the problem by adding the btrfs_add_free_space to
    btrfs_update_pinned_extents which makes sure we are adding the appropriate
    amount of free space to the appropriate block group.  Thanks much to Lee Trager
    for running my myriad of debug patches to help me track this problem down.
    Thank you,
    Signed-off-by: default avatarJosef Bacik <jbacik@redhat.com>
    07103a3c
extent-tree.c 153 KB