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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (C) 2011 Lawrence Livermore National Security, LLC.
*/
#ifndef _ZFS_XATTR_H
#define _ZFS_XATTR_H
#include <linux/posix_acl_xattr.h>
/*
* 2.6.35 API change,
* The const keyword was added to the 'struct xattr_handler' in the
* generic Linux super_block structure. To handle this we define an
* appropriate xattr_handler_t typedef which can be used. This was
* the preferred solution because it keeps the code clean and readable.
*/
#ifdef HAVE_CONST_XATTR_HANDLER
typedef const struct xattr_handler xattr_handler_t;
#else
typedef struct xattr_handler xattr_handler_t;
#endif
/*
* 3.7 API change,
* Preferred XATTR_NAME_* definitions introduced, these are mapped to
* the previous definitions for older kernels.
*/
#ifndef XATTR_NAME_POSIX_ACL_DEFAULT
#define XATTR_NAME_POSIX_ACL_DEFAULT POSIX_ACL_XATTR_DEFAULT
#endif
#ifndef XATTR_NAME_POSIX_ACL_ACCESS
#define XATTR_NAME_POSIX_ACL_ACCESS POSIX_ACL_XATTR_ACCESS
#endif
/*
* 4.5 API change,
*/
#if defined(HAVE_XATTR_LIST_SIMPLE)
#define ZPL_XATTR_LIST_WRAPPER(fn) \
static bool \
fn(struct dentry *dentry) \
{ \
return (!!__ ## fn(dentry->d_inode, NULL, 0, NULL, 0)); \
}
/*
* 4.4 API change,
*/
#elif defined(HAVE_XATTR_LIST_DENTRY)
#define ZPL_XATTR_LIST_WRAPPER(fn) \
static size_t \
fn(struct dentry *dentry, char *list, size_t list_size, \
const char *name, size_t name_len, int type) \
{ \
return (__ ## fn(dentry->d_inode, \
list, list_size, name, name_len)); \
}
/*
* 2.6.33 API change,
*/
#elif defined(HAVE_XATTR_LIST_HANDLER)
#define ZPL_XATTR_LIST_WRAPPER(fn) \
static size_t \
fn(const struct xattr_handler *handler, struct dentry *dentry, \
char *list, size_t list_size, const char *name, size_t name_len) \
{ \
return (__ ## fn(dentry->d_inode, \
list, list_size, name, name_len)); \
}
/*
* 2.6.32 API
*/
#elif defined(HAVE_XATTR_LIST_INODE)
#define ZPL_XATTR_LIST_WRAPPER(fn) \
static size_t \
fn(struct inode *ip, char *list, size_t list_size, \
const char *name, size_t name_len) \
{ \
return (__ ## fn(ip, list, list_size, name, name_len)); \
}
#endif
/*
* 4.7 API change,
* The xattr_handler->get() callback was changed to take a both dentry and
* inode, because the dentry might not be attached to an inode yet.
*/
#if defined(HAVE_XATTR_GET_DENTRY_INODE)
#define ZPL_XATTR_GET_WRAPPER(fn) \
static int \
fn(const struct xattr_handler *handler, struct dentry *dentry, \
struct inode *inode, const char *name, void *buffer, size_t size) \
{ \
return (__ ## fn(inode, name, buffer, size)); \
}
/*
* 4.4 API change,
* The xattr_handler->get() callback was changed to take a xattr_handler,
* and handler_flags argument was removed and should be accessed by
* handler->flags.
*/
#elif defined(HAVE_XATTR_GET_HANDLER)
#define ZPL_XATTR_GET_WRAPPER(fn) \
static int \
fn(const struct xattr_handler *handler, struct dentry *dentry, \
const char *name, void *buffer, size_t size) \
{ \
return (__ ## fn(dentry->d_inode, name, buffer, size)); \
}
/*
* 2.6.33 API change,
* The xattr_handler->get() callback was changed to take a dentry
* instead of an inode, and a handler_flags argument was added.
*/
#elif defined(HAVE_XATTR_GET_DENTRY)
#define ZPL_XATTR_GET_WRAPPER(fn) \
static int \
fn(struct dentry *dentry, const char *name, void *buffer, size_t size, \
int unused_handler_flags) \
{ \
return (__ ## fn(dentry->d_inode, name, buffer, size)); \
}
/*
* 2.6.32 API
*/
#elif defined(HAVE_XATTR_GET_INODE)
#define ZPL_XATTR_GET_WRAPPER(fn) \
static int \
fn(struct inode *ip, const char *name, void *buffer, size_t size) \
{ \
return (__ ## fn(ip, name, buffer, size)); \
}
#endif
/*
* 4.4 API change,
* The xattr_handler->set() callback was changed to take a xattr_handler,
* and handler_flags argument was removed and should be accessed by
* handler->flags.
*/
#if defined(HAVE_XATTR_SET_HANDLER)
#define ZPL_XATTR_SET_WRAPPER(fn) \
static int \
fn(const struct xattr_handler *handler, struct dentry *dentry, \
const char *name, const void *buffer, size_t size, int flags) \
{ \
return (__ ## fn(dentry->d_inode, name, buffer, size, flags)); \
}
/*
* 2.6.33 API change,
* The xattr_handler->set() callback was changed to take a dentry
* instead of an inode, and a handler_flags argument was added.
*/
#elif defined(HAVE_XATTR_SET_DENTRY)
#define ZPL_XATTR_SET_WRAPPER(fn) \
static int \
fn(struct dentry *dentry, const char *name, const void *buffer, \
size_t size, int flags, int unused_handler_flags) \
{ \
return (__ ## fn(dentry->d_inode, name, buffer, size, flags)); \
}
/*
* 2.6.32 API
*/
#elif defined(HAVE_XATTR_SET_INODE)
#define ZPL_XATTR_SET_WRAPPER(fn) \
static int \
fn(struct inode *ip, const char *name, const void *buffer, \
size_t size, int flags) \
{ \
return (__ ## fn(ip, name, buffer, size, flags)); \
}
#endif
#ifdef HAVE_6ARGS_SECURITY_INODE_INIT_SECURITY
#define zpl_security_inode_init_security(ip, dip, qstr, nm, val, len) \
security_inode_init_security(ip, dip, qstr, nm, val, len)
#else
#define zpl_security_inode_init_security(ip, dip, qstr, nm, val, len) \
security_inode_init_security(ip, dip, nm, val, len)
#endif /* HAVE_6ARGS_SECURITY_INODE_INIT_SECURITY */
/*
* Linux 3.7 API change. posix_acl_{from,to}_xattr gained the user_ns
* parameter. All callers are expected to pass the &init_user_ns which
* is available through the init credential (kcred).
*/
#ifdef HAVE_POSIX_ACL_FROM_XATTR_USERNS
static inline struct posix_acl *
zpl_acl_from_xattr(const void *value, int size)
{
return (posix_acl_from_xattr(kcred->user_ns, value, size));
}
static inline int
zpl_acl_to_xattr(struct posix_acl *acl, void *value, int size)
{
return (posix_acl_to_xattr(kcred->user_ns, acl, value, size));
}
#else
static inline struct posix_acl *
zpl_acl_from_xattr(const void *value, int size)
{
return (posix_acl_from_xattr(value, size));
}
static inline int
zpl_acl_to_xattr(struct posix_acl *acl, void *value, int size)
{
return (posix_acl_to_xattr(acl, value, size));
}
#endif /* HAVE_POSIX_ACL_FROM_XATTR_USERNS */
#endif /* _ZFS_XATTR_H */
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