diff options
Diffstat (limited to 'fs/btrfs/transaction.c')
| -rw-r--r-- | fs/btrfs/transaction.c | 53 |
1 files changed, 43 insertions, 10 deletions
diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c index 44e47db4c8e8..d3576f84020d 100644 --- a/fs/btrfs/transaction.c +++ b/fs/btrfs/transaction.c @@ -550,6 +550,7 @@ static void wait_current_trans(struct btrfs_fs_info *fs_info) refcount_inc(&cur_trans->use_count); spin_unlock(&fs_info->trans_lock); + btrfs_might_wait_for_state(fs_info, BTRFS_LOCKDEP_TRANS_UNBLOCKED); wait_event(fs_info->transaction_wait, cur_trans->state >= TRANS_STATE_UNBLOCKED || TRANS_ABORTED(cur_trans)); @@ -868,6 +869,15 @@ static noinline void wait_for_commit(struct btrfs_transaction *commit, u64 transid = commit->transid; bool put = false; + /* + * At the moment this function is called with min_state either being + * TRANS_STATE_COMPLETED or TRANS_STATE_SUPER_COMMITTED. + */ + if (min_state == TRANS_STATE_COMPLETED) + btrfs_might_wait_for_state(fs_info, BTRFS_LOCKDEP_TRANS_COMPLETED); + else + btrfs_might_wait_for_state(fs_info, BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED); + while (1) { wait_event(commit->commit_wait, commit->state >= min_state); if (put) @@ -1980,6 +1990,7 @@ void btrfs_commit_transaction_async(struct btrfs_trans_handle *trans) * Wait for the current transaction commit to start and block * subsequent transaction joins */ + btrfs_might_wait_for_state(fs_info, BTRFS_LOCKDEP_TRANS_COMMIT_START); wait_event(fs_info->transaction_blocked_wait, cur_trans->state >= TRANS_STATE_COMMIT_START || TRANS_ABORTED(cur_trans)); @@ -2137,12 +2148,12 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) ktime_t interval; ASSERT(refcount_read(&trans->use_count) == 1); + btrfs_trans_state_lockdep_acquire(fs_info, BTRFS_LOCKDEP_TRANS_COMMIT_START); /* Stop the commit early if ->aborted is set */ if (TRANS_ABORTED(cur_trans)) { ret = cur_trans->aborted; - btrfs_end_transaction(trans); - return ret; + goto lockdep_trans_commit_start_release; } btrfs_trans_release_metadata(trans); @@ -2159,10 +2170,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) * Any running threads may add more while we are here. */ ret = btrfs_run_delayed_refs(trans, 0); - if (ret) { - btrfs_end_transaction(trans); - return ret; - } + if (ret) + goto lockdep_trans_commit_start_release; } btrfs_create_pending_block_groups(trans); @@ -2191,10 +2200,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) if (run_it) { ret = btrfs_start_dirty_block_groups(trans); - if (ret) { - btrfs_end_transaction(trans); - return ret; - } + if (ret) + goto lockdep_trans_commit_start_release; } } @@ -2209,6 +2216,9 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) if (trans->in_fsync) want_state = TRANS_STATE_SUPER_COMMITTED; + + btrfs_trans_state_lockdep_release(fs_info, + BTRFS_LOCKDEP_TRANS_COMMIT_START); ret = btrfs_end_transaction(trans); wait_for_commit(cur_trans, want_state); @@ -2222,6 +2232,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) cur_trans->state = TRANS_STATE_COMMIT_START; wake_up(&fs_info->transaction_blocked_wait); + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_COMMIT_START); if (cur_trans->list.prev != &fs_info->trans_list) { enum btrfs_trans_state want_state = TRANS_STATE_COMPLETED; @@ -2324,6 +2335,16 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) atomic_read(&cur_trans->num_writers) == 1); /* + * Make lockdep happy by acquiring the state locks after + * btrfs_trans_num_writers is released. If we acquired the state locks + * before releasing the btrfs_trans_num_writers lock then lockdep would + * complain because we did not follow the reverse order unlocking rule. + */ + btrfs_trans_state_lockdep_acquire(fs_info, BTRFS_LOCKDEP_TRANS_COMPLETED); + btrfs_trans_state_lockdep_acquire(fs_info, BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED); + btrfs_trans_state_lockdep_acquire(fs_info, BTRFS_LOCKDEP_TRANS_UNBLOCKED); + + /* * We've started the commit, clear the flag in case we were triggered to * do an async commit but somebody else started before the transaction * kthread could do the work. @@ -2332,6 +2353,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) if (TRANS_ABORTED(cur_trans)) { ret = cur_trans->aborted; + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_UNBLOCKED); goto scrub_continue; } /* @@ -2466,6 +2488,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) mutex_unlock(&fs_info->reloc_mutex); wake_up(&fs_info->transaction_wait); + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_UNBLOCKED); ret = btrfs_write_and_wait_transaction(trans); if (ret) { @@ -2497,6 +2520,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) */ cur_trans->state = TRANS_STATE_SUPER_COMMITTED; wake_up(&cur_trans->commit_wait); + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED); btrfs_finish_extent_commit(trans); @@ -2510,6 +2534,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) */ cur_trans->state = TRANS_STATE_COMPLETED; wake_up(&cur_trans->commit_wait); + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_COMPLETED); spin_lock(&fs_info->trans_lock); list_del_init(&cur_trans->list); @@ -2538,7 +2563,10 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans) unlock_reloc: mutex_unlock(&fs_info->reloc_mutex); + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_UNBLOCKED); scrub_continue: + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_SUPER_COMMITTED); + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_COMPLETED); btrfs_scrub_continue(fs_info); cleanup_transaction: btrfs_trans_release_metadata(trans); @@ -2556,6 +2584,11 @@ lockdep_release: btrfs_lockdep_release(fs_info, btrfs_trans_num_extwriters); btrfs_lockdep_release(fs_info, btrfs_trans_num_writers); goto cleanup_transaction; + +lockdep_trans_commit_start_release: + btrfs_trans_state_lockdep_release(fs_info, BTRFS_LOCKDEP_TRANS_COMMIT_START); + btrfs_end_transaction(trans); + return ret; } /* |