From fe1897eaa6646f5a64a4cee0e6473ed9887d324b Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Fri, 27 Sep 2019 18:01:35 +0800 Subject: f2fs: fix to update time in lazytime mode generic/018 reports an inconsistent status of atime, the testcase is as below: - open file with O_SYNC - write file to construct fraged space - calc md5 of file - record {a,c,m}time - defrag file --- do nothing - umount & mount - check {a,c,m}time The root cause is, as f2fs enables lazytime by default, atime update will dirty vfs inode, rather than dirtying f2fs inode (by set with FI_DIRTY_INODE), so later f2fs_write_inode() called from VFS will fail to update inode page due to our skip: f2fs_write_inode() if (is_inode_flag_set(inode, FI_DIRTY_INODE)) return 0; So eventually, after evict(), we lose last atime for ever. To fix this issue, we need to check whether {a,c,m,cr}time is consistent in between inode cache and inode page, and only skip f2fs_update_inode() if f2fs inode is not dirty and time is consistent as well. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/inode.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs/f2fs/inode.c') diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c index db4fec30c30d..386ad54c13c3 100644 --- a/fs/f2fs/inode.c +++ b/fs/f2fs/inode.c @@ -615,7 +615,11 @@ int f2fs_write_inode(struct inode *inode, struct writeback_control *wbc) inode->i_ino == F2FS_META_INO(sbi)) return 0; - if (!is_inode_flag_set(inode, FI_DIRTY_INODE)) + /* + * atime could be updated without dirtying f2fs inode in lazytime mode + */ + if (f2fs_is_time_consistent(inode) && + !is_inode_flag_set(inode, FI_DIRTY_INODE)) return 0; if (!f2fs_is_checkpoint_ready(sbi)) -- cgit v1.2.3