Release 4.16 fs/overlayfs/ovl_entry.h

/*
 *
 * Copyright (C) 2011 Novell Inc.
 * Copyright (C) 2016 Red Hat, Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation.
 */


struct ovl_config {
	
char *lowerdir;
	
char *upperdir;
	
char *workdir;
	
bool default_permissions;
	
bool redirect_dir;
	
bool redirect_follow;
	
const char *redirect_mode;
	
bool index;
	
bool nfs_export;
};


struct ovl_layer {
	
struct vfsmount *mnt;
	
dev_t pseudo_dev;
	/* Index of this layer in fs root (upper == 0) */
	
int idx;
};


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 ovl_layer *lower_layers;
	/* workbasedir is the path at workdir= mount option */
	
struct dentry *workbasedir;
	/* workdir is the 'work' directory under workbasedir */
	
struct dentry *workdir;
	/* index directory listing overlay inodes by origin file handle */
	
struct dentry *indexdir;
	
long namelen;
	/* pathnames of lower and upper dirs, for show_options */
	
struct ovl_config config;
	/* creds of process who forced instantiation of super block */
	
const struct cred *creator_cred;
	
bool tmpfile;
	
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 */

struct ovl_entry {
	
union {
		
struct {
			
unsigned long flags;
		};
		
struct rcu_head rcu;
	};
	
unsigned numlower;
	
struct ovl_path lowerstack[];
};

struct ovl_entry *ovl_alloc_entry(unsigned int numlower);



static inline struct ovl_entry *OVL_E(struct dentry *dentry)
{
	return (struct ovl_entry *) dentry->d_fsdata;
}

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struct ovl_inode {
	
struct ovl_dir_cache *cache;
	
const char *redirect;
	
u64 version;
	
unsigned long flags;
	
struct inode vfs_inode;
	
struct dentry *__upperdentry;
	
struct inode *lower;

	/* synchronize copy up and more */
	
struct mutex lock;
};



static inline struct ovl_inode *OVL_I(struct inode *inode)
{
	return container_of(inode, struct ovl_inode, vfs_inode);
}

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static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi)
{
	return READ_ONCE(oi->__upperdentry);
}
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106
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10.58%
2
8.33%
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0.34%
1
4.17%
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293
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24
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Directory: fs/overlayfs

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