may_commit_transaction will skip committing the transaction if we don't have enough pinned space or if we're trying to find space for a SYSTEM chunk. However if we have pending free block groups in this transaction we still want to commit as we may be able to allocate a chunk to make our reservation. So instead of just returning ENOSPC, check if we have free block groups pending, and if so commit the transaction to allow us to use that free space.
Signed-off-by: Josef Bacik <jo...@toxicpanda.com> --- fs/btrfs/extent-tree.c | 33 +++++++++++++++++++-------------- 1 file changed, 19 insertions(+), 14 deletions(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 7168e2476944..a3baa16d456f 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4830,10 +4830,18 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info, if (!bytes) return 0; - /* See if there is enough pinned space to make this reservation */ - if (__percpu_counter_compare(&space_info->total_bytes_pinned, - bytes, - BTRFS_TOTAL_BYTES_PINNED_BATCH) >= 0) + trans = btrfs_join_transaction(fs_info->extent_root); + if (IS_ERR(trans)) + return -ENOSPC; + + /* + * See if there is enough pinned space to make this reservation, or if + * we have bg's that are going to be freed, allowing us to possibly do a + * chunk allocation the next loop through. + */ + if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS, &trans->transaction->flags) || + __percpu_counter_compare(&space_info->total_bytes_pinned, bytes, + BTRFS_TOTAL_BYTES_PINNED_BATCH) >= 0) goto commit; /* @@ -4841,7 +4849,7 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info, * this reservation. */ if (space_info != delayed_rsv->space_info) - return -ENOSPC; + goto enospc; spin_lock(&delayed_rsv->lock); reclaim_bytes += delayed_rsv->reserved; @@ -4855,17 +4863,14 @@ static int may_commit_transaction(struct btrfs_fs_info *fs_info, bytes -= reclaim_bytes; if (__percpu_counter_compare(&space_info->total_bytes_pinned, - bytes, - BTRFS_TOTAL_BYTES_PINNED_BATCH) < 0) { - return -ENOSPC; - } - + bytes, + BTRFS_TOTAL_BYTES_PINNED_BATCH) < 0) + goto enospc; commit: - trans = btrfs_join_transaction(fs_info->extent_root); - if (IS_ERR(trans)) - return -ENOSPC; - return btrfs_commit_transaction(trans); +enospc: + btrfs_end_transaction(trans); + return -ENOSPC; } /* -- 2.14.3