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In the 2.6.37 kernel the function invalidate_inodes() is no longer exported for use by modules. This memory management functionality is needed to invalidate the inodes attached to a super block without unmounting the filesystem. Because this function still exists in the kernel and the prototype is available is a common header all we strictly need is the symbol address. The address is obtained using spl_kallsyms_lookup_name() and assigned to the variable invalidate_inodes_fn. Then a #define is used to replace all instances of invalidate_inodes() with a call to the acquired address. All the complexity is hidden behind HAVE_INVALIDATE_INODES and invalidate_inodes() can be used as usual. Long term we should try to get this, or another, interface made available to modules again.
60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
/*****************************************************************************\
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://github.com/behlendorf/spl/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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\*****************************************************************************/
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#ifndef _SPL_MM_COMPAT_H
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#define _SPL_MM_COMPAT_H
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#include <linux/mm.h>
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#include <linux/fs.h>
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/*
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* Linux 2.6.31 API Change.
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* Individual pages_{min,low,high} moved in to watermark array.
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*/
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#ifndef min_wmark_pages
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#define min_wmark_pages(z) (z->pages_min)
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#endif
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#ifndef low_wmark_pages
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#define low_wmark_pages(z) (z->pages_low)
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#endif
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#ifndef high_wmark_pages
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#define high_wmark_pages(z) (z->pages_high)
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#endif
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/*
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* 2.6.37 API compat,
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* The function invalidate_inodes() is no longer exported by the kernel.
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* The prototype however is still available which means it is safe
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* to acquire the symbol's address using spl_kallsyms_lookup_name().
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*/
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#ifndef HAVE_INVALIDATE_INODES
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typedef int (*invalidate_inodes_t)(struct super_block *sb);
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extern invalidate_inodes_t invalidate_inodes_fn;
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#define invalidate_inodes(sb) invalidate_inodes_fn(sb)
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#endif /* HAVE_INVALIDATE_INODES */
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#endif /* SPL_MM_COMPAT_H */
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