From ed0eee678877e7e9276262616d447813edbb33ab Mon Sep 17 00:00:00 2001 From: Jaegeuk Kim Date: Thu, 2 Feb 2017 18:18:06 -0800 Subject: [PATCH] f2fs: avoid out-of-order execution of atomic writes We need to flush data writes before flushing last node block writes by using FUA with PREFLUSH. We don't need to guarantee precedent node writes since if those are not written, we can't reach to the last node block when scanning node block chain during roll-forward recovery. Afterwards f2fs_wait_on_page_writeback guarantees all the IO submission to disk, which builds a valid node block chain. Signed-off-by: Jaegeuk Kim Conflicts: include/trace/events/f2fs.h --- fs/f2fs/file.c | 3 ++- fs/f2fs/node.c | 10 +++++++--- 2 files changed, 9 insertions(+), 4 deletions(-) diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 27ef66ff7aab..12c12cb4a06f 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -279,7 +279,8 @@ sync_nodes: flush_out: remove_ino_entry(sbi, ino, UPDATE_INO); clear_inode_flag(inode, FI_UPDATE_WRITE); - ret = f2fs_issue_flush(sbi); + if (!atomic) + ret = f2fs_issue_flush(sbi); f2fs_update_time(sbi, REQ_TIME); out: trace_f2fs_sync_file_exit(inode, need_cp, datasync, ret); diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 5cdcf5ba43a0..d24bdb970a24 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1318,7 +1318,7 @@ continue_unlock: return last_page; } -static int __write_node_page(struct page *page, +static int __write_node_page(struct page *page, bool atomic, struct writeback_control *wbc) { struct f2fs_sb_info *sbi = F2FS_P_SB(page); @@ -1362,6 +1362,9 @@ static int __write_node_page(struct page *page, return 0; } + if (atomic && !test_opt(sbi, NOBARRIER)) + fio.op_flags |= WRITE_FLUSH_FUA; + set_page_writeback(page); fio.old_blkaddr = ni.blk_addr; write_node_page(nid, &fio); @@ -1387,7 +1390,7 @@ redirty_out: static int f2fs_write_node_page(struct page *page, struct writeback_control *wbc) { - return __write_node_page(page, wbc); + return __write_node_page(page, false, wbc); } int fsync_node_pages(struct f2fs_sb_info *sbi, struct inode *inode, @@ -1469,7 +1472,8 @@ continue_unlock: if (!clear_page_dirty_for_io(page)) goto continue_unlock; - ret = __write_node_page(page, wbc); + ret = __write_node_page(page, atomic && + page == last_page, wbc); if (ret) { unlock_page(page); f2fs_put_page(last_page, 0);