diff options
| -rw-r--r-- | fs/btrfs/volumes.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 7efc2f7a9bb2..8fbd736aad9f 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -4277,20 +4277,29 @@ static int balance_remap_chunks(struct btrfs_fs_info *fs_info, struct btrfs_path end: while (!list_empty(chunks)) { bool is_unused; + struct btrfs_block_group *bg; rci = list_first_entry(chunks, struct remap_chunk_info, list); - spin_lock(&rci->bg->lock); - is_unused = !btrfs_is_block_group_used(rci->bg); - spin_unlock(&rci->bg->lock); + bg = rci->bg; + if (bg) { + /* + * This is a bit racy and the 'used' status can change + * but this is not a problem as later functions will + * verify it again. + */ + spin_lock(&bg->lock); + is_unused = !btrfs_is_block_group_used(bg); + spin_unlock(&bg->lock); - if (is_unused) - btrfs_mark_bg_unused(rci->bg); + if (is_unused) + btrfs_mark_bg_unused(bg); - if (rci->made_ro) - btrfs_dec_block_group_ro(rci->bg); + if (rci->made_ro) + btrfs_dec_block_group_ro(bg); - btrfs_put_block_group(rci->bg); + btrfs_put_block_group(bg); + } list_del(&rci->list); kfree(rci); |