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/* SPDX-License-Identifier: GPL-2.0 */
/*
* fs-verity: read-only file-based authenticity protection
*
* This header declares the interface between the fs/verity/ support layer and
* filesystems that support fs-verity.
*
* Copyright 2019 Google LLC
*/
#ifndef _LINUX_FSVERITY_H
#define _LINUX_FSVERITY_H
#include <linux/fs.h>
#include <uapi/linux/fsverity.h>
/* Verity operations for filesystems */
struct fsverity_operations {
/**
* Get the verity descriptor of the given inode.
*
* @inode: an inode with the S_VERITY flag set
* @buf: buffer in which to place the verity descriptor
* @bufsize: size of @buf, or 0 to retrieve the size only
*
* If bufsize == 0, then the size of the verity descriptor is returned.
* Otherwise the verity descriptor is written to 'buf' and its actual
* size is returned; -ERANGE is returned if it's too large. This may be
* called by multiple processes concurrently on the same inode.
*
* Return: the size on success, -errno on failure
*/
int (*get_verity_descriptor)(struct inode *inode, void *buf,
size_t bufsize);
};
#ifdef CONFIG_FS_VERITY
static inline struct fsverity_info *fsverity_get_info(const struct inode *inode)
{
/* pairs with the cmpxchg() in fsverity_set_info() */
return READ_ONCE(inode->i_verity_info);
}
/* open.c */
extern int fsverity_file_open(struct inode *inode, struct file *filp);
extern int fsverity_prepare_setattr(struct dentry *dentry, struct iattr *attr);
extern void fsverity_cleanup_inode(struct inode *inode);
#else /* !CONFIG_FS_VERITY */
static inline struct fsverity_info *fsverity_get_info(const struct inode *inode)
{
return NULL;
}
/* open.c */
static inline int fsverity_file_open(struct inode *inode, struct file *filp)
{
return IS_VERITY(inode) ? -EOPNOTSUPP : 0;
}
static inline int fsverity_prepare_setattr(struct dentry *dentry,
struct iattr *attr)
{
return IS_VERITY(d_inode(dentry)) ? -EOPNOTSUPP : 0;
}
static inline void fsverity_cleanup_inode(struct inode *inode)
{
}
#endif /* !CONFIG_FS_VERITY */
#endif /* _LINUX_FSVERITY_H */
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