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Btrfs: fix a possible deadlock between scrub and transaction committing 

btrfs_scrub_continue() will be called when cleaning up transaction.However,
this can only be called if btrfs_scrub_pause() is called before.

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fb.com>
hifive-unleashed-5.1
Wang Shilong 2014-02-19 19:24:16 +08:00 committed by Josef Bacik
parent 886322e8e7
commit 6cf7f77e6b
1 changed files with 11 additions and 11 deletions
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22
fs/btrfs/transaction.c
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@ -1578,8 +1578,6 @@ static void cleanup_transaction(struct btrfs_trans_handle *trans,
trace_btrfs_transaction_commit(root);
btrfs_scrub_continue(root);
if (current->journal_info == trans)
current->journal_info = NULL;
@ -1754,7 +1752,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
/* ->aborted might be set after the previous check, so check it */
if (unlikely(ACCESS_ONCE(cur_trans->aborted))) {
ret = cur_trans->aborted;
goto cleanup_transaction;
goto scrub_continue;
}
/*
* the reloc mutex makes sure that we stop
@ -1771,7 +1769,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
ret = create_pending_snapshots(trans, root->fs_info);
if (ret) {
mutex_unlock(&root->fs_info->reloc_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
/*
@ -1787,13 +1785,13 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
ret = btrfs_run_delayed_items(trans, root);
if (ret) {
mutex_unlock(&root->fs_info->reloc_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1);
if (ret) {
mutex_unlock(&root->fs_info->reloc_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
/*
@ -1823,7 +1821,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
if (ret) {
mutex_unlock(&root->fs_info->tree_log_mutex);
mutex_unlock(&root->fs_info->reloc_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
/*
@ -1844,7 +1842,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
if (ret) {
mutex_unlock(&root->fs_info->tree_log_mutex);
mutex_unlock(&root->fs_info->reloc_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
/*
@ -1855,7 +1853,7 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
ret = cur_trans->aborted;
mutex_unlock(&root->fs_info->tree_log_mutex);
mutex_unlock(&root->fs_info->reloc_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
btrfs_prepare_extent_commit(trans, root);
@ -1891,13 +1889,13 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
btrfs_error(root->fs_info, ret,
"Error while writing out transaction");
mutex_unlock(&root->fs_info->tree_log_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
ret = write_ctree_super(trans, root, 0);
if (ret) {
mutex_unlock(&root->fs_info->tree_log_mutex);
goto cleanup_transaction;
goto scrub_continue;
}
/*
@ -1940,6 +1938,8 @@ int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
return ret;
scrub_continue:
btrfs_scrub_continue(root);
cleanup_transaction:
btrfs_trans_release_metadata(trans, root);
trans->block_rsv = NULL;