ovl_dentry_real() returns the real dentry. (Either upper or lower). We
also need an helper to ignore metacopy dentries and return "real data"
dentry. This helper returns an upper/lower dentry which contains data.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
---
fs/overlayfs/overlayfs.h | 1 +
fs/overlayfs/util.c | 12 ++++++++++++
2 files changed, 13 insertions(+)
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 08df75f473fe..5077d2992d07 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -230,6 +230,7 @@ struct dentry *ovl_dentry_lower(struct dentry *dentry);
struct dentry *ovl_dentry_lowerdata(struct dentry *dentry);
struct ovl_layer *ovl_layer_lower(struct dentry *dentry);
struct dentry *ovl_dentry_real(struct dentry *dentry);
+struct dentry *ovl_dentry_real_data(struct dentry *dentry);
struct dentry *ovl_i_dentry_upper(struct inode *inode);
struct inode *ovl_inode_upper(struct inode *inode);
struct inode *ovl_inode_lower(struct inode *inode);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 7029036b9aa3..2bef013ca432 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -228,6 +228,18 @@ struct dentry *ovl_dentry_real(struct dentry *dentry)
return ovl_dentry_upper(dentry) ?: ovl_dentry_lower(dentry);
}
+/* Return real dentry which contains data. Skip metacopy dentries */
+struct dentry *ovl_dentry_real_data(struct dentry *dentry)
+{
+ struct dentry *upperdentry;
+
+ upperdentry = ovl_dentry_upper(dentry);
+ if (upperdentry && ovl_has_upperdata(d_inode(dentry)))
+ return upperdentry;
+
+ return ovl_dentry_lowerdata(dentry);
+}
+
struct dentry *ovl_i_dentry_upper(struct inode *inode)
{
return ovl_upperdentry_dereference(OVL_I(inode));
--
2.13.6
--
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