diff options
| author | Brian Behlendorf <[email protected]> | 2011-03-23 15:45:55 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2011-04-06 20:06:03 -0700 |
| commit | 495bd532ab4aaef46b57094d59707bad91e6ec25 (patch) | |
| tree | 16bd9d692bfe445673dd52c01c7b34ae665682cd /include | |
| parent | 91cb1d91a4cf0dfa360f09747915699d0bef3d6f (diff) | |
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);
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm_compat.h | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/include/linux/mm_compat.h b/include/linux/mm_compat.h index 5c5198b90..7e2f6b8a5 100644 --- a/include/linux/mm_compat.h +++ b/include/linux/mm_compat.h @@ -56,4 +56,50 @@ extern invalidate_inodes_t invalidate_inodes_fn; #define invalidate_inodes(sb) invalidate_inodes_fn(sb) #endif /* HAVE_INVALIDATE_INODES */ +#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); +} + +# define SPL_SHRINKER_DECLARE(s, x, y) \ + static spl_shrinker_t s = { .shrinker = NULL, .fn = x, .seeks = y } +# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \ + static int fn(int y, unsigned int z) +# define spl_exec_shrinker(ss, nr, gfp) \ + ((spl_shrinker_t *)ss)->fn(nr, gfp) + +#else /* HAVE_SET_SHRINKER */ + +# define spl_register_shrinker(x) register_shrinker(x) +# define spl_unregister_shrinker(x) unregister_shrinker(x) +# define SPL_SHRINKER_DECLARE(s, x, y) \ + static struct shrinker s = { .shrink = x, .seeks = y } + +# ifdef HAVE_3ARGS_SHRINKER_CALLBACK +# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \ + static int fn(struct shrinker *x, int y, unsigned int z) +# define spl_exec_shrinker(ss, nr, gfp) \ + ((struct shrinker *)ss)->shrink(NULL, nr, gfp) +# else /* HAVE_3ARGS_SHRINKER_CALLBACK */ +# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \ + static int fn(int y, unsigned int z) +# define spl_exec_shrinker(ss, nr, gfp) \ + ((struct shrinker *)ss)->shrink(nr, gfp) +# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */ +#endif /* HAVE_SET_SHRINKER */ + #endif /* SPL_MM_COMPAT_H */ |