On 10.05.2018 09:21, Omar Sandoval wrote: > From: Omar Sandoval <[email protected]> > > btrfs_truncate_inode_items() uses two variables for error handling, ret > and err. These are not handled consistently, leading to a couple of > bugs. > > - Errors from btrfs_del_items() are handled but not propagated to the > caller > - If btrfs_run_delayed_refs() fails and aborts the transaction, we > continue running > > Just use ret everywhere and simplify things a bit, fixing both of these > issues. > > Fixes: 79787eaab461 ("btrfs: replace many BUG_ONs with proper error handling") > Fixes: 1262133b8d6f ("Btrfs: account for crcs in delayed ref processing") > Signed-off-by: Omar Sandoval <[email protected]>
That function is horrendous so it needs much loving and this is a step in the right direction. LGTM: Reviewed-by: Nikolay Borisov <[email protected]> > --- > fs/btrfs/inode.c | 55 ++++++++++++++++++++++++------------------------ > 1 file changed, 28 insertions(+), 27 deletions(-) > > diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c > index fef8dbb6a93f..79d1da01a90d 100644 > --- a/fs/btrfs/inode.c > +++ b/fs/btrfs/inode.c > @@ -4442,7 +4442,6 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > int pending_del_slot = 0; > int extent_type = -1; > int ret; > - int err = 0; > u64 ino = btrfs_ino(BTRFS_I(inode)); > u64 bytes_deleted = 0; > bool be_nice = false; > @@ -4494,22 +4493,19 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > * up a huge file in a single leaf. Most of the time that > * bytes_deleted is > 0, it will be huge by the time we get here > */ > - if (be_nice && bytes_deleted > SZ_32M) { > - if (btrfs_should_end_transaction(trans)) { > - err = -EAGAIN; > - goto error; > - } > + if (be_nice && bytes_deleted > SZ_32M && > + btrfs_should_end_transaction(trans)) { > + ret = -EAGAIN; > + goto out; > } > > - > path->leave_spinning = 1; > ret = btrfs_search_slot(trans, root, &key, path, -1, 1); > - if (ret < 0) { > - err = ret; > + if (ret < 0) > goto out; > - } > > if (ret > 0) { > + ret = 0; > /* there are no items in the tree for us to truncate, we're > * done > */ > @@ -4620,7 +4616,7 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > * We have to bail so the last_size is set to > * just before this extent. > */ > - err = NEED_TRUNCATE_BLOCK; > + ret = NEED_TRUNCATE_BLOCK; > break; > } > > @@ -4687,7 +4683,7 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > pending_del_nr); > if (ret) { > btrfs_abort_transaction(trans, ret); > - goto error; > + break; > } > pending_del_nr = 0; > } > @@ -4698,8 +4694,8 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > trans->delayed_ref_updates = 0; > ret = btrfs_run_delayed_refs(trans, > updates * 2); > - if (ret && !err) > - err = ret; > + if (ret) > + break; > } > } > /* > @@ -4707,8 +4703,8 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > * and let the transaction restart > */ > if (should_end) { > - err = -EAGAIN; > - goto error; > + ret = -EAGAIN; > + break; > } > goto search_again; > } else { > @@ -4716,32 +4712,37 @@ int btrfs_truncate_inode_items(struct > btrfs_trans_handle *trans, > } > } > out: > - if (pending_del_nr) { > - ret = btrfs_del_items(trans, root, path, pending_del_slot, > + if (ret >= 0 && pending_del_nr) { > + int err; > + > + err = btrfs_del_items(trans, root, path, pending_del_slot, > pending_del_nr); > - if (ret) > - btrfs_abort_transaction(trans, ret); > + if (err) { > + btrfs_abort_transaction(trans, err); > + ret = err; > + } > } > -error: > if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { > ASSERT(last_size >= new_size); > - if (!err && last_size > new_size) > + if (!ret && last_size > new_size) > last_size = new_size; > btrfs_ordered_update_i_size(inode, last_size, NULL); > } > > btrfs_free_path(path); > > - if (be_nice && bytes_deleted > SZ_32M) { > + if (be_nice && bytes_deleted > SZ_32M && (ret >= 0 || ret == -EAGAIN)) { > unsigned long updates = trans->delayed_ref_updates; > + int err; > + > if (updates) { > trans->delayed_ref_updates = 0; > - ret = btrfs_run_delayed_refs(trans, updates * 2); > - if (ret && !err) > - err = ret; > + err = btrfs_run_delayed_refs(trans, updates * 2); > + if (err) > + ret = err; > } > } > - return err; > + return ret; > } > > /* > -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
