diff options
Diffstat (limited to 'fs/overlayfs/ovl_entry.h')
| -rw-r--r-- | fs/overlayfs/ovl_entry.h | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h index 878a750986dd..752bab645879 100644 --- a/fs/overlayfs/ovl_entry.h +++ b/fs/overlayfs/ovl_entry.h @@ -17,11 +17,21 @@ struct ovl_config { bool index; }; +struct ovl_layer { + struct vfsmount *mnt; + dev_t pseudo_dev; +}; + +struct ovl_path { + struct ovl_layer *layer; + struct dentry *dentry; +}; + /* private information held for overlayfs's superblock */ struct ovl_fs { struct vfsmount *upper_mnt; unsigned numlower; - struct vfsmount **lower_mnt; + struct ovl_layer *lower_layers; /* workbasedir is the path at workdir= mount option */ struct dentry *workbasedir; /* workdir is the 'work' directory under workbasedir */ @@ -37,6 +47,9 @@ struct ovl_fs { bool noxattr; /* sb common to all layers */ struct super_block *same_sb; + /* Did we take the inuse lock? */ + bool upperdir_locked; + bool workdir_locked; }; /* private information held for every overlayfs dentry */ @@ -49,7 +62,7 @@ struct ovl_entry { struct rcu_head rcu; }; unsigned numlower; - struct path lowerstack[]; + struct ovl_path lowerstack[]; }; struct ovl_entry *ovl_alloc_entry(unsigned int numlower); @@ -74,5 +87,5 @@ static inline struct ovl_inode *OVL_I(struct inode *inode) static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi) { - return lockless_dereference(oi->__upperdentry); + return READ_ONCE(oi->__upperdentry); } |