btrfs: fix inode reserve space leak due to nowait buffered write
During a nowait buffered write, if we fail to balance dirty pages we exit btrfs_buffered_write() without releasing the delalloc space reserved for an extent, resulting in leaking space from the inode's block reserve. So fix that by releasing the delalloc space for the extent when balancing dirty pages fails. Reported-by: Nkernel test robot <yujie.liu@intel.com> Link: https://lore.kernel.org/all/202210111304.d369bc32-yujie.liu@intel.com Fixes: 965f47ae ("btrfs: make btrfs_buffered_write nowait compatible") Reviewed-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NFilipe Manana <fdmanana@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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