Need to treat non-regular overlayfs files the same as regular files when
checking for an atime update.
Add a d_real() flag to make it return the real dentry for all file types.
Reported-by: "zhangyi (F)" <yi.zhang@xxxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
---
fs/inode.c | 3 ++-
fs/overlayfs/super.c | 3 +++
include/linux/dcache.h | 3 +++
3 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/fs/inode.c b/fs/inode.c
index 50370599e371..16e85d3a46d1 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -1570,7 +1570,8 @@ static void update_ovl_inode_times(struct dentry *dentry, struct inode *inode,
bool rcu)
{
if (!rcu) {
- struct inode *realinode = d_real_inode(dentry);
+ struct inode *realinode =
+ d_inode(d_real(dentry, NULL, 0, D_REAL_ALL));
if (unlikely(inode != realinode) &&
(!timespec_equal(&inode->i_mtime, &realinode->i_mtime) ||
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 19e89ce39017..059ee2f19361 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -75,6 +75,9 @@ static struct dentry *ovl_d_real(struct dentry *dentry,
struct dentry *real;
int err;
+ if (flags & D_REAL_ALL)
+ return ovl_dentry_real(dentry);
+
if (!d_is_reg(dentry)) {
if (!inode || inode == d_inode(dentry))
return dentry;
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index fd0721e520f4..9594ef3382ff 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -562,6 +562,9 @@ static inline struct dentry *d_backing_dentry(struct dentry *upper)
return upper;
}
+/* d_real() flags */
+#define D_REAL_ALL 0x1 /* return real dentry for all file types */
+
/**
* d_real - Return the real dentry
* @dentry: the dentry to query
--
2.5.5
