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ovl: Store lower data inode in ovl_inode

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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>
This commit is contained in:
Vivek Goyal
2018-05-11 11:49:30 -04:00
committed by Miklos Szeredi
parent 67d756c27a
commit 2664bd0897
6 changed files with 27 additions and 6 deletions
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5
fs/overlayfs/ovl_entry.h
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@@ -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;