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zfs/include/linux/mm_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.
* For details, see <http://github.com/behlendorf/spl/>.
*
* 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/>.
\*****************************************************************************/
Linux 2.6.31 Compatibility Updates SPL_AC_2ARGS_SET_FS_PWD macro updated to explicitly include linux/fs_struct.h which was dropped from linux/sched.h. min_wmark_pages, low_wmark_pages, high_wmark_pages macros introduced in newer kernels. For older kernels mm_compat.h was introduced to define them as needed as direct mappings to per zone min_pages, low_pages, max_pages.
2009-11-10 22:06:57 +00:00
#ifndef _SPL_MM_COMPAT_H
#define _SPL_MM_COMPAT_H
#include <linux/mm.h>
Linux compat 2.6.37, invalidate_inodes() 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.
2011-02-23 20:25:45 +00:00
#include <linux/fs.h>
Linux 2.6.31 Compatibility Updates SPL_AC_2ARGS_SET_FS_PWD macro updated to explicitly include linux/fs_struct.h which was dropped from linux/sched.h. min_wmark_pages, low_wmark_pages, high_wmark_pages macros introduced in newer kernels. For older kernels mm_compat.h was introduced to define them as needed as direct mappings to per zone min_pages, low_pages, max_pages.
2009-11-10 22:06:57 +00:00
/*
* Linux 2.6.31 API Change.
* Individual pages_{min,low,high} moved in to watermark array.
*/
#ifndef min_wmark_pages
#define min_wmark_pages(z) (z->pages_min)
#endif
#ifndef low_wmark_pages
#define low_wmark_pages(z) (z->pages_low)
#endif
#ifndef high_wmark_pages
#define high_wmark_pages(z) (z->pages_high)
#endif
Linux compat 2.6.37, invalidate_inodes() 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.
2011-02-23 20:25:45 +00:00
/*
* 2.6.37 API compat,
* The function invalidate_inodes() is no longer exported by the kernel.
* The prototype however is still available which means it is safe
* to acquire the symbol's address using spl_kallsyms_lookup_name().
Linux 2.6.39 compat, invalidate_inodes() To resolve a potiential filesystem corruption issue a second argument was added to invalidate_inodes(). This argument controls whether dirty inodes are dropped or treated as busy when invalidating a super block. When only the legacy API is available the second argument will be dropped for compatibility.
2011-04-18 20:47:43 +00:00
*
* 2.6.39 API compat,
* As for 2.6.39 invalidate_inodes() was updated to take a second
* argument which controls how dirty inodes should be handled.
Linux compat 2.6.37, invalidate_inodes() 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.
2011-02-23 20:25:45 +00:00
*/
Linux 2.6.39 compat, invalidate_inodes() To resolve a potiential filesystem corruption issue a second argument was added to invalidate_inodes(). This argument controls whether dirty inodes are dropped or treated as busy when invalidating a super block. When only the legacy API is available the second argument will be dropped for compatibility.
2011-04-18 20:47:43 +00:00
#ifdef HAVE_INVALIDATE_INODES
# ifdef HAVE_2ARGS_INVALIDATE_INODES
# define spl_invalidate_inodes(sb, kd) invalidate_inodes(sb, kd)
# else
# define spl_invalidate_inodes(sb, kd) invalidate_inodes(sb)
# endif /* HAVE_2ARGS_INVALIDATE_INODES */
#else
# ifdef HAVE_2ARGS_INVALIDATE_INODES
typedef int (*invalidate_inodes_t)(struct super_block *sb, bool kd);
extern invalidate_inodes_t invalidate_inodes_fn;
# define spl_invalidate_inodes(sb, kd) invalidate_inodes_fn(sb, kd)
# else
Linux compat 2.6.37, invalidate_inodes() 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.
2011-02-23 20:25:45 +00:00
typedef int (*invalidate_inodes_t)(struct super_block *sb);
extern invalidate_inodes_t invalidate_inodes_fn;
Linux 2.6.39 compat, invalidate_inodes() To resolve a potiential filesystem corruption issue a second argument was added to invalidate_inodes(). This argument controls whether dirty inodes are dropped or treated as busy when invalidating a super block. When only the legacy API is available the second argument will be dropped for compatibility.
2011-04-18 20:47:43 +00:00
# define spl_invalidate_inodes(sb, kd) invalidate_inodes_fn(sb)
# endif /* HAVE_2ARGS_INVALIDATE_INODES */
Linux compat 2.6.37, invalidate_inodes() 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.
2011-02-23 20:25:45 +00:00
#endif /* HAVE_INVALIDATE_INODES */
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
#if !defined(HAVE_SHRINK_CONTROL_STRUCT)
struct shrink_control {
gfp_t gfp_mask;
unsigned long nr_to_scan;
};
#endif /* HAVE_SHRINK_CONTROL_STRUCT */
Add dnlc_reduce_cache() support Provide the dnlc_reduce_cache() function which attempts to prune cached entries from the dcache and icache. After the entries are pruned any slabs which they may have been using are reaped. Note the API takes a reclaim percentage but we don't have easy access to the total number of cache entries to calculate the reclaim count. However, in practice this doesn't need to be exactly correct. We simply need to reclaim some useful fraction (but not all) of the cache. The caller can determine if more needs to be done.
2011-03-31 00:44:35 +00:00
/*
* 2.6.xx API compat,
* There currently exists no exposed API to partially shrink the dcache.
* The expected mechanism to shrink the cache is a registered shrinker
* which is called during memory pressure.
*/
#ifndef HAVE_SHRINK_DCACHE_MEMORY
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
# if defined(HAVE_SHRINK_CONTROL_STRUCT)
typedef int (*shrink_dcache_memory_t)(struct shrinker *,
struct shrink_control *);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
# define shrink_dcache_memory(nr, gfp) \
({ \
struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp }; \
shrink_dcache_memory_fn(NULL, &sc); \
})
# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
Add dnlc_reduce_cache() support Provide the dnlc_reduce_cache() function which attempts to prune cached entries from the dcache and icache. After the entries are pruned any slabs which they may have been using are reaped. Note the API takes a reclaim percentage but we don't have easy access to the total number of cache entries to calculate the reclaim count. However, in practice this doesn't need to be exactly correct. We simply need to reclaim some useful fraction (but not all) of the cache. The caller can determine if more needs to be done.
2011-03-31 00:44:35 +00:00
typedef int (*shrink_dcache_memory_t)(struct shrinker *, int, gfp_t);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
# define shrink_dcache_memory(nr, gfp) shrink_dcache_memory_fn(NULL, nr, gfp)
# else
typedef int (*shrink_dcache_memory_t)(int, gfp_t);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
# define shrink_dcache_memory(nr, gfp) shrink_dcache_memory_fn(nr, gfp)
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
#endif /* HAVE_SHRINK_DCACHE_MEMORY */
/*
* 2.6.xx API compat,
* There currently exists no exposed API to partially shrink the icache.
* The expected mechanism to shrink the cache is a registered shrinker
* which is called during memory pressure.
*/
#ifndef HAVE_SHRINK_ICACHE_MEMORY
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
# if defined(HAVE_SHRINK_CONTROL_STRUCT)
typedef int (*shrink_icache_memory_t)(struct shrinker *,
struct shrink_control *);
extern shrink_icache_memory_t shrink_icache_memory_fn;
# define shrink_icache_memory(nr, gfp) \
({ \
struct shrink_control sc = { .nr_to_scan = nr, .gfp_mask = gfp }; \
shrink_icache_memory_fn(NULL, &sc); \
})
# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
Add dnlc_reduce_cache() support Provide the dnlc_reduce_cache() function which attempts to prune cached entries from the dcache and icache. After the entries are pruned any slabs which they may have been using are reaped. Note the API takes a reclaim percentage but we don't have easy access to the total number of cache entries to calculate the reclaim count. However, in practice this doesn't need to be exactly correct. We simply need to reclaim some useful fraction (but not all) of the cache. The caller can determine if more needs to be done.
2011-03-31 00:44:35 +00:00
typedef int (*shrink_icache_memory_t)(struct shrinker *, int, gfp_t);
extern shrink_icache_memory_t shrink_icache_memory_fn;
# define shrink_icache_memory(nr, gfp) shrink_icache_memory_fn(NULL, nr, gfp)
# else
typedef int (*shrink_icache_memory_t)(int, gfp_t);
extern shrink_icache_memory_t shrink_icache_memory_fn;
# define shrink_icache_memory(nr, gfp) shrink_icache_memory_fn(nr, gfp)
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
#endif /* HAVE_SHRINK_ICACHE_MEMORY */
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
/*
* Linux 2.6. - 2.6. Shrinker API Compatibility.
*/
Linux shrinker compat The Linux shrinker has gone through three API changes since 2.6.22. Rather than force every caller to understand all three APIs this change consolidates the compatibility code in to the mm-compat.h header. The caller then can then use a single spl provided shrinker API which does the right thing for your kernel. SPL_SHRINKER_CALLBACK_PROTO(shrinker_callback, cb, nr_to_scan, gfp_mask); SPL_SHRINKER_DECLARE(shrinker_struct, shrinker_callback, seeks); spl_register_shrinker(&shrinker_struct); spl_unregister_shrinker(&&shrinker_struct); spl_exec_shrinker(&shrinker_struct, nr_to_scan, gfp_mask);
2011-03-23 22:45:55 +00:00
#ifdef HAVE_SET_SHRINKER
typedef struct spl_shrinker {
struct shrinker *shrinker;
shrinker_t fn;
int seeks;
} spl_shrinker_t;
static inline void
spl_register_shrinker(spl_shrinker_t *ss)
{
ss->shrinker = set_shrinker(ss->seeks, ss->fn);
}
static inline void
spl_unregister_shrinker(spl_shrinker_t *ss)
{
remove_shrinker(ss->shrinker);
}
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
# define SPL_SHRINKER_DECLARE(s, x, y) \
static spl_shrinker_t s = { \
.shrinker = NULL, \
.fn = x, \
.seeks = y \
}
# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
static int fn(int, unsigned int)
# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
static int \
fn(int nr_to_scan, unsigned int gfp_mask) \
{ \
struct shrink_control sc; \
\
sc.nr_to_scan = nr_to_scan; \
sc.gfp_mask = gfp_mask; \
\
return __ ## fn(NULL, &sc); \
}
Linux shrinker compat The Linux shrinker has gone through three API changes since 2.6.22. Rather than force every caller to understand all three APIs this change consolidates the compatibility code in to the mm-compat.h header. The caller then can then use a single spl provided shrinker API which does the right thing for your kernel. SPL_SHRINKER_CALLBACK_PROTO(shrinker_callback, cb, nr_to_scan, gfp_mask); SPL_SHRINKER_DECLARE(shrinker_struct, shrinker_callback, seeks); spl_register_shrinker(&shrinker_struct); spl_unregister_shrinker(&&shrinker_struct); spl_exec_shrinker(&shrinker_struct, nr_to_scan, gfp_mask);
2011-03-23 22:45:55 +00:00
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
#else
Linux shrinker compat The Linux shrinker has gone through three API changes since 2.6.22. Rather than force every caller to understand all three APIs this change consolidates the compatibility code in to the mm-compat.h header. The caller then can then use a single spl provided shrinker API which does the right thing for your kernel. SPL_SHRINKER_CALLBACK_PROTO(shrinker_callback, cb, nr_to_scan, gfp_mask); SPL_SHRINKER_DECLARE(shrinker_struct, shrinker_callback, seeks); spl_register_shrinker(&shrinker_struct); spl_unregister_shrinker(&&shrinker_struct); spl_exec_shrinker(&shrinker_struct, nr_to_scan, gfp_mask);
2011-03-23 22:45:55 +00:00
# define spl_register_shrinker(x) register_shrinker(x)
# define spl_unregister_shrinker(x) unregister_shrinker(x)
Linux 3.0: Shrinker compatibility Update the the wrapper macros for the memory shrinker to handle this 4th API change. The callback function now takes a shrink_control structure. This is certainly a step in the right direction but it's annoying to have to accomidate yet another version of the API.
2011-06-16 22:39:08 +00:00
# define SPL_SHRINKER_DECLARE(s, x, y) \
static struct shrinker s = { \
.shrink = x, \
.seeks = y \
}
/*
* Linux 2.6. - 2.6. Shrinker API Compatibility.
*/
# if defined(HAVE_SHRINK_CONTROL_STRUCT)
# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
static int fn(struct shrinker *, struct shrink_control *)
# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
static int \
fn(struct shrinker *shrink, struct shrink_control *sc) { \
return __ ## fn(shrink, sc); \
}
/*
* Linux 2.6. - 2.6. Shrinker API Compatibility.
*/
# elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
static int fn(struct shrinker *, int, unsigned int)
# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
static int \
fn(struct shrinker *shrink, int nr_to_scan, unsigned int gfp_mask) \
{ \
struct shrink_control sc; \
\
sc.nr_to_scan = nr_to_scan; \
sc.gfp_mask = gfp_mask; \
\
return __ ## fn(shrink, &sc); \
}
/*
* Linux 2.6. - 2.6. Shrinker API Compatibility.
*/
# else
# define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
static int fn(int, unsigned int)
# define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
static int \
fn(int nr_to_scan, unsigned int gfp_mask) \
{ \
struct shrink_control sc; \
\
sc.nr_to_scan = nr_to_scan; \
sc.gfp_mask = gfp_mask; \
\
return __ ## fn(NULL, &sc); \
}
# endif
Linux shrinker compat The Linux shrinker has gone through three API changes since 2.6.22. Rather than force every caller to understand all three APIs this change consolidates the compatibility code in to the mm-compat.h header. The caller then can then use a single spl provided shrinker API which does the right thing for your kernel. SPL_SHRINKER_CALLBACK_PROTO(shrinker_callback, cb, nr_to_scan, gfp_mask); SPL_SHRINKER_DECLARE(shrinker_struct, shrinker_callback, seeks); spl_register_shrinker(&shrinker_struct); spl_unregister_shrinker(&&shrinker_struct); spl_exec_shrinker(&shrinker_struct, nr_to_scan, gfp_mask);
2011-03-23 22:45:55 +00:00
#endif /* HAVE_SET_SHRINKER */
Linux 2.6.31 Compatibility Updates SPL_AC_2ARGS_SET_FS_PWD macro updated to explicitly include linux/fs_struct.h which was dropped from linux/sched.h. min_wmark_pages, low_wmark_pages, high_wmark_pages macros introduced in newer kernels. For older kernels mm_compat.h was introduced to define them as needed as direct mappings to per zone min_pages, low_pages, max_pages.
2009-11-10 22:06:57 +00:00
#endif /* SPL_MM_COMPAT_H */