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authorVivek Goyal <vgoyal@redhat.com>2018-05-11 11:49:30 -0400
committerMiklos Szeredi <mszeredi@redhat.com>2018-07-20 09:56:11 +0200
commit2664bd0897c2889258472a1ee922ef9d4c5fa58f (patch)
tree4451f757dc52c00751c3158c24dc1bb004a6bc59 /fs/overlayfs/ovl_entry.h
parent67d756c27ac4f4576dee313579724bd8711bc75e (diff)
downloadlinux-2664bd0897c2889258472a1ee922ef9d4c5fa58f.tar.bz2
ovl: Store lower data inode in ovl_inode
Right now ovl_inode stores inode pointer for lower inode. This helps with quickly getting lower inode given overlay inode (ovl_inode_lower()). Now with metadata only copy-up, we can have metacopy inode in middle layer as well and inode containing data can be different from ->lower. I need to be able to open the real file in ovl_open_realfile() and for that I need to quickly find the lower data inode. Hence store lower data inode also in ovl_inode. Also provide an helper ovl_inode_lowerdata() to access this field. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/ovl_entry.h')
-rw-r--r--fs/overlayfs/ovl_entry.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index ea4134e97d0d..ec237035333a 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -89,7 +89,10 @@ static inline struct ovl_entry *OVL_E(struct dentry *dentry)
}
struct ovl_inode {
- struct ovl_dir_cache *cache;
+ union {
+ struct ovl_dir_cache *cache; /* directory */
+ struct inode *lowerdata; /* regular file */
+ };
const char *redirect;
u64 version;
unsigned long flags;