From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f194.google.com ([209.85.192.194]:40000 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932501AbeCJSVA (ORCPT ); Sat, 10 Mar 2018 13:21:00 -0500 Received: by mail-pf0-f194.google.com with SMTP id x1so2617555pfh.7 for ; Sat, 10 Mar 2018 10:21:00 -0800 (PST) From: Andiry Xu To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org Cc: dan.j.williams@intel.com, andy.rudoff@intel.com, coughlan@redhat.com, swanson@cs.ucsd.edu, david@fromorbit.com, jack@suse.com, swhiteho@redhat.com, miklos@szeredi.hu, andiry.xu@gmail.com, Andiry Xu Subject: [RFC v2 36/83] Journal: Lite journal recovery. Date: Sat, 10 Mar 2018 10:18:17 -0800 Message-Id: <1520705944-6723-37-git-send-email-jix024@eng.ucsd.edu> In-Reply-To: <1520705944-6723-1-git-send-email-jix024@eng.ucsd.edu> References: <1520705944-6723-1-git-send-email-jix024@eng.ucsd.edu> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Andiry Xu Signed-off-by: Andiry Xu --- fs/nova/journal.c | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) diff --git a/fs/nova/journal.c b/fs/nova/journal.c index 75d590f..f31de97 100644 --- a/fs/nova/journal.c +++ b/fs/nova/journal.c @@ -106,3 +106,58 @@ static int nova_check_journal_entries(struct super_block *sb, return 0; } + +/**************************** Journal Recovery ******************************/ + +static void nova_undo_journal_entry(struct super_block *sb, + struct nova_lite_journal_entry *entry) +{ + u64 addr, value; + + addr = le64_to_cpu(entry->data1); + value = le64_to_cpu(entry->data2); + + *(u64 *)nova_get_block(sb, addr) = (u64)value; + nova_flush_buffer((void *)nova_get_block(sb, addr), CACHELINE_SIZE, 0); +} + +static void nova_undo_lite_journal_entry(struct super_block *sb, + struct nova_lite_journal_entry *entry) +{ + u64 type; + + type = le64_to_cpu(entry->type); + + switch (type) { + case JOURNAL_INODE: + /* Currently unused */ + break; + case JOURNAL_ENTRY: + nova_undo_journal_entry(sb, entry); + break; + default: + nova_dbg("%s: unknown data type %llu\n", __func__, type); + break; + } +} + +/* Roll back all journal enries */ +static int nova_recover_lite_journal(struct super_block *sb, + struct journal_ptr_pair *pair) +{ + struct nova_lite_journal_entry *entry; + u64 temp; + + temp = pair->journal_head; + while (temp != pair->journal_tail) { + entry = (struct nova_lite_journal_entry *)nova_get_block(sb, + temp); + nova_undo_lite_journal_entry(sb, entry); + temp = next_lite_journal(temp); + } + + pair->journal_tail = pair->journal_head; + nova_flush_buffer(&pair->journal_head, CACHELINE_SIZE, 1); + + return 0; +} -- 2.7.4