On Tue, Jun 06, 2017 at 04:45:28PM -0700, Omar Sandoval wrote:
> From: Omar Sandoval <osan...@fb.com>
>
> The extents marked in pin_down_extent() will be unpinned later in
> unpin_extent_range(), which decrements total_bytes_pinned.
> pin_down_extent() must increment the counter to avoid underflowing it.
> Also adjust btrfs_free_tree_block() to avoid accounting for the same
> extent twice.
>
Reviewed-by: Liu Bo <bo.li....@oracle.com>
-liubo
> Signed-off-by: Omar Sandoval <osan...@fb.com>
> ---
> fs/btrfs/extent-tree.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
> index 6032e9a635f2..9cff937415cb 100644
> --- a/fs/btrfs/extent-tree.c
> +++ b/fs/btrfs/extent-tree.c
> @@ -6343,6 +6343,7 @@ static int pin_down_extent(struct btrfs_fs_info
> *fs_info,
>
> trace_btrfs_space_reservation(fs_info, "pinned",
> cache->space_info->flags, num_bytes, 1);
> + percpu_counter_add(&cache->space_info->total_bytes_pinned, num_bytes);
> set_extent_dirty(fs_info->pinned_extents, bytenr,
> bytenr + num_bytes - 1, GFP_NOFS | __GFP_NOFAIL);
> return 0;
> @@ -7189,6 +7190,7 @@ void btrfs_free_tree_block(struct btrfs_trans_handle
> *trans,
> goto out;
> }
>
> + pin = 0;
> cache = btrfs_lookup_block_group(fs_info, buf->start);
>
> if (btrfs_header_flag(buf, BTRFS_HEADER_FLAG_WRITTEN)) {
> @@ -7204,7 +7206,6 @@ void btrfs_free_tree_block(struct btrfs_trans_handle
> *trans,
> btrfs_free_reserved_bytes(cache, buf->len, 0);
> btrfs_put_block_group(cache);
> trace_btrfs_reserved_extent_free(fs_info, buf->start, buf->len);
> - pin = 0;
> }
> out:
> if (pin)
> --
> 2.13.0
>
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