Merge remote-tracking branch 'ovl/misc' into work.misc

[cascardo/linux.git] / fs / inode.c

diff --git a/fs/inode.c b/fs/inode.c
index 691c007..a3c7ba7 100644 (file)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1562,17 +1562,37 @@ sector_t bmap(struct inode *inode, sector_t block)
 }
 EXPORT_SYMBOL(bmap);
 
+/*
+ * Update times in overlayed inode from underlying real inode
+ */
+static void update_ovl_inode_times(struct dentry *dentry, struct inode *inode,
+                              bool rcu)
+{
+       if (!rcu) {
+               struct inode *realinode = d_real_inode(dentry);
+
+               if (unlikely(inode != realinode) &&
+                   (!timespec_equal(&inode->i_mtime, &realinode->i_mtime) ||
+                    !timespec_equal(&inode->i_ctime, &realinode->i_ctime))) {
+                       inode->i_mtime = realinode->i_mtime;
+                       inode->i_ctime = realinode->i_ctime;
+               }
+       }
+}
+
 /*
  * 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
  * passed since the last atime update.
  */
-static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
-                            struct timespec now)
+static int relatime_need_update(const struct path *path, struct inode *inode,
+                               struct timespec now, bool rcu)
 {
 
-       if (!(mnt->mnt_flags & MNT_RELATIME))
+       if (!(path->mnt->mnt_flags & MNT_RELATIME))
                return 1;
+
+       update_ovl_inode_times(path->dentry, inode, rcu);
        /*
         * Is mtime younger than atime? If yes, update atime:
         */
@@ -1639,7 +1659,8 @@ static int update_time(struct inode *inode, struct timespec *time, int flags)
  *     This function automatically handles read only file systems and media,
  *     as well as the "noatime" flag and inode specific "noatime" markers.
  */
-bool atime_needs_update(const struct path *path, struct inode *inode)
+bool __atime_needs_update(const struct path *path, struct inode *inode,
+                         bool rcu)
 {
        struct vfsmount *mnt = path->mnt;
        struct timespec now;
@@ -1665,7 +1686,7 @@ bool atime_needs_update(const struct path *path, struct inode *inode)
 
        now = current_fs_time(inode->i_sb);
 
-       if (!relatime_need_update(mnt, inode, now))
+       if (!relatime_need_update(path, inode, now, rcu))
                return false;
 
        if (timespec_equal(&inode->i_atime, &now))
@@ -1680,7 +1701,7 @@ void touch_atime(const struct path *path)
        struct inode *inode = d_inode(path->dentry);
        struct timespec now;
 
-       if (!atime_needs_update(path, inode))
+       if (!__atime_needs_update(path, inode, false))
                return;
 
        if (!sb_start_write_trylock(inode->i_sb))