From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751516AbbCIDTQ (ORCPT ); Sun, 8 Mar 2015 23:19:16 -0400 Received: from mga02.intel.com ([134.134.136.20]:20150 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751390AbbCIDTM (ORCPT ); Sun, 8 Mar 2015 23:19:12 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.11,365,1422950400"; d="scan'208";a="464420984" From: Wanpeng Li To: Jaegeuk Kim Cc: Changman Lee , Chao Yu , linux-f2fs-devel@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Wanpeng Li Subject: [PATCH 3/3] f2fs: fix unlocked nat set cache operation Date: Mon, 9 Mar 2015 11:00:55 +0800 Message-Id: <1425870055-27694-3-git-send-email-wanpeng.li@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1425870055-27694-1-git-send-email-wanpeng.li@linux.intel.com> References: <1425870055-27694-1-git-send-email-wanpeng.li@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org nm_i->nat_tree_lock is used to sync both the operations of nat entry cache tree and nat set cache tree, however, it isn't held when flush nat entries during checkpoint which lead to potential race, this patch fix it by holding the lock when gang lookup nat set cache and delete item from nat set cache. Signed-off-by: Wanpeng Li --- fs/f2fs/node.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 8751375..14e4387 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1837,6 +1837,7 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, struct f2fs_nat_block *nat_blk; struct nat_entry *ne, *cur; struct page *page = NULL; + struct f2fs_nm_info *nm_i = NM_I(sbi); /* * there are two steps to flush nat entries: @@ -1890,7 +1891,9 @@ static void __flush_nat_entry_set(struct f2fs_sb_info *sbi, f2fs_bug_on(sbi, set->entry_cnt); + down_write(&nm_i->nat_tree_lock); radix_tree_delete(&NM_I(sbi)->nat_set_root, set->set); + up_write(&nm_i->nat_tree_lock); kmem_cache_free(nat_entry_set_slab, set); } @@ -1918,6 +1921,7 @@ void flush_nat_entries(struct f2fs_sb_info *sbi) if (!__has_cursum_space(sum, nm_i->dirty_nat_cnt, NAT_JOURNAL)) remove_nats_in_journal(sbi); + down_write(&nm_i->nat_tree_lock); while ((found = __gang_lookup_nat_set(nm_i, set_idx, SETVEC_SIZE, setvec))) { unsigned idx; @@ -1926,6 +1930,7 @@ void flush_nat_entries(struct f2fs_sb_info *sbi) __adjust_nat_entry_set(setvec[idx], &sets, MAX_NAT_JENTRIES(sum)); } + up_write(&nm_i->nat_tree_lock); /* flush dirty nats in nat entry set */ list_for_each_entry_safe(set, tmp, &sets, set_list) -- 1.9.1