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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.
2010-05-18 02:18:00 +04:00
/*****************************************************************************\
* 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 05:26:55 +04:00
* 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.
2010-05-18 02:18:00 +04:00
*
* 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/>.
\*****************************************************************************/
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.
2009-11-11 01:06:57 +03:00
#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 23:25:45 +03:00
#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.
2009-11-11 01:06:57 +03:00
/*
* 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 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.
2011-06-17 02:39:08 +04:00
#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 04:44:35 +04:00
/*
* 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.
2011-06-17 02:39:08 +04:00
# 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 }; \
Linux 3.1 compat, shrink_*cache_memory As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #52
2011-11-10 04:31:03 +04:00
int __ret__ = 0; \
\
if (shrink_dcache_memory_fn) \
__ret__ = shrink_dcache_memory_fn(NULL, &sc); \
\
__ret__; \
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.
2011-06-17 02:39:08 +04:00
})
# 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 04:44:35 +04:00
typedef int (*shrink_dcache_memory_t)(struct shrinker *, int, gfp_t);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
Linux 3.1 compat, shrink_*cache_memory As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #52
2011-11-10 04:31:03 +04:00
# define shrink_dcache_memory(nr, gfp) \
({ \
int __ret__ = 0; \
\
if (shrink_dcache_memory_fn) \
__ret__ = shrink_dcache_memory_fn(NULL, nr, gfp); \
\
__ret__; \
})
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 04:44:35 +04:00
# else
typedef int (*shrink_dcache_memory_t)(int, gfp_t);
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
Linux 3.1 compat, shrink_*cache_memory As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #52
2011-11-10 04:31:03 +04:00
# define shrink_dcache_memory(nr, gfp) \
({ \
int __ret__ = 0; \
\
if (shrink_dcache_memory_fn) \
__ret__ = shrink_dcache_memory_fn(nr, gfp); \
\
__ret__; \
})
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 04:44:35 +04:00
# 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.
2011-06-17 02:39:08 +04:00
# 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 }; \
Linux 3.1 compat, shrink_*cache_memory As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #52
2011-11-10 04:31:03 +04:00
int __ret__ = 0; \
\
if (shrink_icache_memory_fn) \
__ret__ = shrink_icache_memory_fn(NULL, &sc); \
\
__ret__; \
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.
2011-06-17 02:39:08 +04:00
})
# 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 04:44:35 +04:00
typedef int (*shrink_icache_memory_t)(struct shrinker *, int, gfp_t);
extern shrink_icache_memory_t shrink_icache_memory_fn;
Linux 3.1 compat, shrink_*cache_memory As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #52
2011-11-10 04:31:03 +04:00
# define shrink_icache_memory(nr, gfp) \
({ \
int __ret__ = 0; \
\
if (shrink_icache_memory_fn) \
__ret__ = shrink_icache_memory_fn(NULL, nr, gfp); \
\
__ret__; \
})
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 04:44:35 +04:00
# else
typedef int (*shrink_icache_memory_t)(int, gfp_t);
extern shrink_icache_memory_t shrink_icache_memory_fn;
Linux 3.1 compat, shrink_*cache_memory As of Linux 3.1 the shrink_dcache_memory and shrink_icache_memory functions have been removed. This same task is now accomplished more cleanly with per super block shrinkers. This unfortunately leaves us no easy way to support the dnlc_reduce_cache() function. This support has always been entirely optional. So when no reasonable interface is available allow the dnlc_reduce_cache() function to effectively become a no-op. The downside of this change is that it will prevent the zfs arc meta data limts from being enforced. However, the current zfs implementation in this regard is already flawed and needs to be reworked. If the arc needs to enfore a meta data limit it will need to be extended to coordinate directly with the zpl. This will allow us to drop all this compatibility code and get more fine grained control over the cache management. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #52
2011-11-10 04:31:03 +04:00
# define shrink_icache_memory(nr, gfp) \
({ \
int __ret__ = 0; \
\
if (shrink_icache_memory_fn) \
__ret__ = shrink_icache_memory_fn(nr, gfp); \
\
__ret__; \
})
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 04:44:35 +04:00
# 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.
2011-06-17 02:39:08 +04:00
/*
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
* Due to frequent changes in the shrinker API the following
* compatibility wrappers should be used. They are as follows:
*
* SPL_SHRINKER_DECLARE is used to declare the shrinker which is
* passed to spl_register_shrinker()/spl_unregister_shrinker(). Use
* shrinker_name to set the shrinker variable name, shrinker_callback
* to set the callback function, and seek_cost to define the cost of
* reclaiming an object.
*
* SPL_SHRINKER_DECLARE(shrinker_name, shrinker_callback, seek_cost);
*
* SPL_SHRINKER_CALLBACK_FWD_DECLARE is used when a forward declaration
* of the shrinker callback function is required. Only the callback
* function needs to be passed.
*
* SPL_SHRINKER_CALLBACK_FWD_DECLARE(shrinker_callback);
*
* SPL_SHRINKER_CALLBACK_WRAPPER is used to declare the callback function
* which is registered with the shrinker. This function will call your
* custom shrinker which must use the following prototype. Notice the
* leading __'s, these must be appended to the callback_function name.
*
* int __shrinker_callback(struct shrinker *, struct shrink_control *)
* SPL_SHRINKER_CALLBACK_WRAPPER(shrinker_callback);a
*
*
* Example:
*
* SPL_SHRINKER_CALLBACK_FWD_DECLARE(my_shrinker_fn);
* SPL_SHRINKER_DECLARE(my_shrinker, my_shrinker_fn, 1);
*
* static int
* __my_shrinker_fn(struct shrinker *shrink, struct shrink_control *sc)
* {
* if (sc->nr_to_scan) {
* ...scan objects in the cache and reclaim them...
* }
*
* ...calculate number of objects in the cache...
*
* return (number of objects in the cache);
* }
* SPL_SHRINKER_CALLBACK_WRAPPER(my_shrinker_fn);
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.
2011-06-17 02:39:08 +04:00
*/
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);
2011-03-24 01:45:55 +03:00
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#define spl_register_shrinker(x) register_shrinker(x)
#define spl_unregister_shrinker(x) unregister_shrinker(x)
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);
2011-03-24 01:45:55 +03:00
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
/*
* Linux 2.6.23 - 2.6.34 Shrinker API Compatibility.
*/
#if defined(HAVE_2ARGS_OLD_SHRINKER_CALLBACK)
#define SPL_SHRINKER_DECLARE(s, x, y) \
static struct shrinker s = { \
.shrink = x, \
.seeks = y \
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.
2011-06-17 02:39:08 +04:00
}
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);
2011-03-24 01:45:55 +03:00
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
static int fn(int nr_to_scan, unsigned int gfp_mask)
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);
2011-03-24 01:45:55 +03:00
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#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 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.
2011-06-17 02:39:08 +04:00
/*
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
* Linux 2.6.35 to 2.6.39 Shrinker API Compatibility.
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.
2011-06-17 02:39:08 +04:00
*/
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#elif defined(HAVE_3ARGS_SHRINKER_CALLBACK)
#define SPL_SHRINKER_DECLARE(s, x, y) \
static struct shrinker s = { \
.shrink = x, \
.seeks = y \
}
#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 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.
2011-06-17 02:39:08 +04:00
}
/*
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
* Linux 3.0 to 3.11 Shrinker API Compatibility.
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.
2011-06-17 02:39:08 +04:00
*/
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#elif defined(HAVE_2ARGS_NEW_SHRINKER_CALLBACK)
#define SPL_SHRINKER_DECLARE(s, x, y) \
static struct shrinker s = { \
.shrink = x, \
.seeks = y \
}
#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 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.
2011-06-17 02:39:08 +04:00
}
/*
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
* Linux 3.12 and later Shrinker API Compatibility.
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.
2011-06-17 02:39:08 +04:00
*/
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#elif defined(HAVE_SPLIT_SHRINKER_CALLBACK)
#define SPL_SHRINKER_DECLARE(s, x, y) \
static struct shrinker s = { \
.count_objects = x ## _count_objects, \
.scan_objects = x ## _scan_objects, \
.seeks = y \
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.
2011-06-17 02:39:08 +04:00
}
Linux 3.12 compat: New shrinker API torvalds/linux@24f7c6 introduced a new shrinker API while torvalds/linux@a0b021 dropped support for the old shrinker API. This patch adds support for the new shrinker API by wrapping the old one with the new one. This change also reorganizes the autotools checks on the shrinker API such that the configure script will fail early if an unknown API is encountered in the future. Support for the set_shrinker() API which was used by Linux 2.6.22 and older has been dropped. As a general rule compatibility is only maintained back to Linux 2.6.26. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes zfsonlinux/zfs#1732 Closes zfsonlinux/zfs#1822 Closes #293 Closes #307
2013-11-05 20:35:54 +04:00
#define SPL_SHRINKER_CALLBACK_FWD_DECLARE(fn) \
static unsigned long fn ## _count_objects(struct shrinker *, \
struct shrink_control *); \
static unsigned long fn ## _scan_objects(struct shrinker *, \
struct shrink_control *)
#define SPL_SHRINKER_CALLBACK_WRAPPER(fn) \
static unsigned long \
fn ## _count_objects(struct shrinker *shrink, struct shrink_control *sc)\
{ \
int __ret__; \
\
sc->nr_to_scan = 0; \
__ret__ = __ ## fn(NULL, sc); \
\
/* Errors may not be returned and must be converted to zeros */ \
return ((__ret__ < 0) ? 0 : __ret__); \
} \
\
static unsigned long \
fn ## _scan_objects(struct shrinker *shrink, struct shrink_control *sc) \
{ \
int __ret__; \
\
__ret__ = __ ## fn(NULL, sc); \
return ((__ret__ < 0) ? SHRINK_STOP : __ret__); \
}
#else
/*
* Linux 2.x to 2.6.22, or a newer shrinker API has been introduced.
*/
#error "Unknown shrinker callback"
#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);
2011-03-24 01:45:55 +03:00
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.
2009-11-11 01:06:57 +03:00
#endif /* SPL_MM_COMPAT_H */
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