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zfs/include/linux/module_compat.h

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Public Release Prep Updated AUTHORS, COPYING, DISCLAIMER, and INSTALL files. Added standardized headers to all source file to clearly indicate the copyright, license, and to give credit where credit is due.
2010-05-17 22:18:00 +00:00
/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
Refresh links to web site Update links to refer to the official ZFS on Linux website instead of @behlendorf's personal fork on github. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-03-05 01:26:55 +00:00
* For details, see <http://zfsonlinux.org/>.
Public Release Prep Updated AUTHORS, COPYING, DISCLAIMER, and INSTALL files. Added standardized headers to all source file to clearly indicate the copyright, license, and to give credit where credit is due.
2010-05-17 22:18:00 +00:00
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/
Set cwd to '/' for the process executing insmod. Ricardo has pointed out that under Solaris the cwd is set to '/' during module load, while under Linux it is set to the callers cwd. To handle this cleanly I've reworked the module *_init()/_exit() macros so they call a *_setup()/_cleanup() function when any SPL dependent module is loaded or unloaded. This gives us a chance to perform any needed modification of the process, in this case changing the cwd. It also handily provides a way to avoid creating wrapper init()/exit() functions because the Solaris and Linux prototypes differ slightly. All dependent modules should now call the spl helper macros spl_module_{init,exit}() instead of the native linux versions. Unfortunately, it appears that under Linux there has been no consistent API in the kernel to set the cwd in a module. Because of this I have had to add more autoconf magic than I'd like. However, what I have done is correct and has been tested on RHEL5, SLES11, FC11, and CHAOS kernels. In addition, I have change the rootdir type from a 'void *' to the correct 'vnode_t *' type. And I've set rootdir to a non-NULL value.
2009-10-01 23:06:15 +00:00
#ifndef _SPL_MODULE_COMPAT_H
#define _SPL_MODULE_COMPAT_H
#include <linux/module.h>
#define spl_module_init(init_fn) \
static int \
spl_##init_fn(void) \
{ \
int rc; \
\
spl_setup(); \
rc = init_fn(); \
\
return rc; \
} \
\
module_init(spl_##init_fn)
#define spl_module_exit(exit_fn) \
static void \
spl_##exit_fn(void) \
{ \
int rc; \
\
rc = exit_fn(); \
spl_cleanup(); \
if (rc) \
printk(KERN_ERR "SPL: Failure %d unloading " \
"dependent module\n", rc); \
} \
\
module_exit(spl_##exit_fn)
#endif /* _SPL_MODULE_COMPAT_H */