From: Vivek Goyal <vgoyal@xxxxxxxxxx>
Add an helper to retrieve real data inode associated with overlay inode.
This helper will ignore all metacopy inodes and will return only the real
inode which has data.
Signed-off-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
Signed-off-by: Miklos Szeredi <mszeredi@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 558a1b444286..dcd600201ec8 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -229,6 +229,7 @@ struct inode *ovl_inode_upper(struct inode *inode);
struct inode *ovl_inode_lower(struct inode *inode);
struct inode *ovl_inode_lowerdata(struct inode *inode);
struct inode *ovl_inode_real(struct inode *inode);
+struct inode *ovl_inode_realdata(struct inode *inode);
struct ovl_dir_cache *ovl_dir_cache(struct inode *inode);
void ovl_set_dir_cache(struct inode *inode, struct ovl_dir_cache *cache);
void ovl_dentry_set_flag(unsigned long flag, struct dentry *dentry);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index 63311c536216..73939e08d8bf 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -256,6 +256,18 @@ struct inode *ovl_inode_lowerdata(struct inode *inode)
return OVL_I(inode)->lowerdata ?: ovl_inode_lower(inode);
}
+/* Return real inode which contains data. Does not return metacopy inode */
+struct inode *ovl_inode_realdata(struct inode *inode)
+{
+ struct inode *upperinode;
+
+ upperinode = ovl_inode_upper(inode);
+ if (upperinode && ovl_has_upperdata(inode))
+ return upperinode;
+
+ return ovl_inode_lowerdata(inode);
+}
+
struct ovl_dir_cache *ovl_dir_cache(struct inode *inode)
{
return OVL_I(inode)->cache;
--
2.14.3
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