From patchwork Tue Jan 4 09:08:12 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: Update atime from future. Date: Mon, 03 Jan 2011 23:08:12 -0000 From: yangsheng X-Patchwork-Id: 77427 Message-Id: <1294132092-4423-1-git-send-email-sickamd@gmail.com> To: linux-kernel@vger.kernel.org Cc: adilger@dilger.ca, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, swhiteho@redhat.com, yangsheng If atime has been wrong set to future, then it cannot be updated back to current time. Signed-off-by: sickamd@gmail.com Reviewed-by: adilger@dilger.ca --- fs/inode.c | 10 +++++++++- 1 files changed, 9 insertions(+), 1 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index da85e56..d92779f 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -1446,6 +1446,8 @@ sector_t bmap(struct inode *inode, sector_t block) } EXPORT_SYMBOL(bmap); +#define RELATIME_MARGIN (24 * 60 * 60) + /* * With relative atime, only update atime if the previous atime is * earlier than either the ctime or mtime or if at least a day has @@ -1469,10 +1471,16 @@ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode, return 1; /* + * Is the previous atime value in future? If yes, + * update atime: + */ + if ((long)(now.tv_sec - inode->i_atime.tv_sec) < -RELATIME_MARGIN) + return 1; + /* * Is the previous atime value older than a day? If yes, * update atime: */ - if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60) + if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= RELATIME_MARGIN) return 1; /* * Good, we can skip the atime update: