From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qt0-f172.google.com ([209.85.216.172]:34040 "EHLO mail-qt0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727067AbeH3VqC (ORCPT ); Thu, 30 Aug 2018 17:46:02 -0400 Received: by mail-qt0-f172.google.com with SMTP id m13-v6so11332704qth.1 for ; Thu, 30 Aug 2018 10:42:47 -0700 (PDT) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id c15-v6sm4129624qkm.42.2018.08.30.10.42.45 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 30 Aug 2018 10:42:45 -0700 (PDT) From: Josef Bacik To: linux-btrfs@vger.kernel.org Subject: [PATCH 10/35] btrfs: fix truncate throttling Date: Thu, 30 Aug 2018 13:42:00 -0400 Message-Id: <20180830174225.2200-11-josef@toxicpanda.com> In-Reply-To: <20180830174225.2200-1-josef@toxicpanda.com> References: <20180830174225.2200-1-josef@toxicpanda.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: We have a bunch of magic to make sure we're throttling delayed refs when truncating a file. Now that we have a delayed refs rsv and a mechanism for refilling that reserve simply use that instead of all of this magic. Signed-off-by: Josef Bacik --- fs/btrfs/inode.c | 78 ++++++++++++-------------------------------------------- 1 file changed, 16 insertions(+), 62 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 212fa71317d6..10455d0aa71c 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4493,31 +4493,6 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) return err; } -static int truncate_space_check(struct btrfs_trans_handle *trans, - struct btrfs_root *root, - u64 bytes_deleted) -{ - struct btrfs_fs_info *fs_info = root->fs_info; - int ret; - - /* - * This is only used to apply pressure to the enospc system, we don't - * intend to use this reservation at all. - */ - bytes_deleted = btrfs_csum_bytes_to_leaves(fs_info, bytes_deleted); - bytes_deleted *= fs_info->nodesize; - ret = btrfs_block_rsv_add(root, &fs_info->trans_block_rsv, - bytes_deleted, BTRFS_RESERVE_NO_FLUSH); - if (!ret) { - trace_btrfs_space_reservation(fs_info, "transaction", - trans->transid, - bytes_deleted, 1); - trans->bytes_reserved += bytes_deleted; - } - return ret; - -} - /* * Return this if we need to call truncate_block for the last bit of the * truncate. @@ -4562,7 +4537,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, u64 bytes_deleted = 0; bool be_nice = false; bool should_throttle = false; - bool should_end = false; BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); @@ -4775,15 +4749,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, btrfs_abort_transaction(trans, ret); break; } - if (btrfs_should_throttle_delayed_refs(trans, fs_info)) - btrfs_async_run_delayed_refs(fs_info, - trans->delayed_ref_updates * 2, - trans->transid, 0); if (be_nice) { - if (truncate_space_check(trans, root, - extent_num_bytes)) { - should_end = true; - } if (btrfs_should_throttle_delayed_refs(trans, fs_info)) should_throttle = true; @@ -4795,7 +4761,7 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, if (path->slots[0] == 0 || path->slots[0] != pending_del_slot || - should_throttle || should_end) { + should_throttle) { if (pending_del_nr) { ret = btrfs_del_items(trans, root, path, pending_del_slot, @@ -4807,23 +4773,23 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, pending_del_nr = 0; } btrfs_release_path(path); - if (should_throttle) { - unsigned long updates = trans->delayed_ref_updates; - if (updates) { - trans->delayed_ref_updates = 0; - ret = btrfs_run_delayed_refs(trans, - updates * 2); - if (ret) - break; - } - } + /* - * if we failed to refill our space rsv, bail out - * and let the transaction restart + * We can generate a lot of delayed refs, so we need to + * throttle every once and a while and make sure we're + * adding enough space to keep up with the work we are + * generating. Since we hold a transaction here we can + * only FLUSH_LIMIT, if this fails we just return EAGAIN + * and let the normal space allocation stuff do it's + * work. */ - if (should_end) { - ret = -EAGAIN; - break; + if (should_throttle) { + ret = btrfs_refill_delayed_refs_rsv(fs_info, + BTRFS_RESERVE_FLUSH_LIMIT); + if (ret) { + ret = -EAGAIN; + break; + } } goto search_again; } else { @@ -4849,18 +4815,6 @@ int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, } btrfs_free_path(path); - - 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; - err = btrfs_run_delayed_refs(trans, updates * 2); - if (err) - ret = err; - } - } return ret; } -- 2.14.3