From: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
d_select_inode() is a helper function to translate dentry to inodes
while using in conjunction with overlayfs so dentries evaluate to
true lower inodes.
Signed-off-by: Goldwyn Rodrigues <rgoldwyn@xxxxxxxx>
---
include/linux/dcache.h | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 7781ce11..dbaa420 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -541,6 +541,21 @@ static inline struct inode *d_inode(const struct dentry *dentry)
}
/**
+ * d_select_inode - Get the actual inode of this dentry
+ * @dentry: The dentry to query
+ * @flags: open flags passed
+ *
+ * This is the helper to select the underlying true inode associated with
+ * a dentry to cover cases of translating overlay filesystem.
+ */
+static inline struct inode *d_select_inode(struct dentry *dentry, int flags)
+{
+ if (dentry->d_flags & DCACHE_OP_SELECT_INODE)
+ return dentry->d_op->d_select_inode(dentry, flags);
+ return dentry->d_inode;
+}
+
+/**
* d_inode_rcu - Get the actual inode of this dentry with ACCESS_ONCE()
* @dentry: The dentry to query
*
--
2.6.2
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