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Linux shrinker compat

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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);
This commit is contained in:
Brian Behlendorf
2011-03-23 15:45:55 -07:00
parent 91cb1d91a4
commit 495bd532ab
2 changed files with 55 additions and 41 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/linux/mm_compat.h
+46
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@@ -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 */