--- /dev/null
+/*
+ * 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://zfsonlinux.org/>.
+ *
+ * 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/>.
+ */
+
+#ifndef _SPL_KMEM_CACHE_H
+#define _SPL_KMEM_CACHE_H
+
+#include <sys/taskq.h>
+
+/*
+ * Slab allocation interfaces. The SPL slab differs from the standard
+ * Linux SLAB or SLUB primarily in that each cache may be backed by slabs
+ * allocated from the physical or virtal memory address space. The virtual
+ * slabs allow for good behavior when allocation large objects of identical
+ * size. This slab implementation also supports both constructors and
+ * destructors which the Linux slab does not.
+ */
+enum {
+ KMC_BIT_NOTOUCH = 0, /* Don't update ages */
+ KMC_BIT_NODEBUG = 1, /* Default behavior */
+ KMC_BIT_NOMAGAZINE = 2, /* XXX: Unsupported */
+ KMC_BIT_NOHASH = 3, /* XXX: Unsupported */
+ KMC_BIT_QCACHE = 4, /* XXX: Unsupported */
+ KMC_BIT_KMEM = 5, /* Use kmem cache */
+ KMC_BIT_VMEM = 6, /* Use vmem cache */
+ KMC_BIT_SLAB = 7, /* Use Linux slab cache */
+ KMC_BIT_OFFSLAB = 8, /* Objects not on slab */
+ KMC_BIT_NOEMERGENCY = 9, /* Disable emergency objects */
+ KMC_BIT_DEADLOCKED = 14, /* Deadlock detected */
+ KMC_BIT_GROWING = 15, /* Growing in progress */
+ KMC_BIT_REAPING = 16, /* Reaping in progress */
+ KMC_BIT_DESTROY = 17, /* Destroy in progress */
+ KMC_BIT_TOTAL = 18, /* Proc handler helper bit */
+ KMC_BIT_ALLOC = 19, /* Proc handler helper bit */
+ KMC_BIT_MAX = 20, /* Proc handler helper bit */
+};
+
+/* kmem move callback return values */
+typedef enum kmem_cbrc {
+ KMEM_CBRC_YES = 0, /* Object moved */
+ KMEM_CBRC_NO = 1, /* Object not moved */
+ KMEM_CBRC_LATER = 2, /* Object not moved, try again later */
+ KMEM_CBRC_DONT_NEED = 3, /* Neither object is needed */
+ KMEM_CBRC_DONT_KNOW = 4, /* Object unknown */
+} kmem_cbrc_t;
+
+#define KMC_NOTOUCH (1 << KMC_BIT_NOTOUCH)
+#define KMC_NODEBUG (1 << KMC_BIT_NODEBUG)
+#define KMC_NOMAGAZINE (1 << KMC_BIT_NOMAGAZINE)
+#define KMC_NOHASH (1 << KMC_BIT_NOHASH)
+#define KMC_QCACHE (1 << KMC_BIT_QCACHE)
+#define KMC_KMEM (1 << KMC_BIT_KMEM)
+#define KMC_VMEM (1 << KMC_BIT_VMEM)
+#define KMC_SLAB (1 << KMC_BIT_SLAB)
+#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
+#define KMC_NOEMERGENCY (1 << KMC_BIT_NOEMERGENCY)
+#define KMC_DEADLOCKED (1 << KMC_BIT_DEADLOCKED)
+#define KMC_GROWING (1 << KMC_BIT_GROWING)
+#define KMC_REAPING (1 << KMC_BIT_REAPING)
+#define KMC_DESTROY (1 << KMC_BIT_DESTROY)
+#define KMC_TOTAL (1 << KMC_BIT_TOTAL)
+#define KMC_ALLOC (1 << KMC_BIT_ALLOC)
+#define KMC_MAX (1 << KMC_BIT_MAX)
+
+#define KMC_REAP_CHUNK INT_MAX
+#define KMC_DEFAULT_SEEKS 1
+
+#define KMC_EXPIRE_AGE 0x1 /* Due to age */
+#define KMC_EXPIRE_MEM 0x2 /* Due to low memory */
+
+#define KMC_RECLAIM_ONCE 0x1 /* Force a single shrinker pass */
+
+extern unsigned int spl_kmem_cache_expire;
+extern struct list_head spl_kmem_cache_list;
+extern struct rw_semaphore spl_kmem_cache_sem;
+
+#define SKM_MAGIC 0x2e2e2e2e
+#define SKO_MAGIC 0x20202020
+#define SKS_MAGIC 0x22222222
+#define SKC_MAGIC 0x2c2c2c2c
+
+#define SPL_KMEM_CACHE_DELAY 15 /* Minimum slab release age */
+#define SPL_KMEM_CACHE_REAP 0 /* Default reap everything */
+#define SPL_KMEM_CACHE_OBJ_PER_SLAB 8 /* Target objects per slab */
+#define SPL_KMEM_CACHE_OBJ_PER_SLAB_MIN 1 /* Minimum objects per slab */
+#define SPL_KMEM_CACHE_ALIGN 8 /* Default object alignment */
+#ifdef _LP64
+#define SPL_KMEM_CACHE_MAX_SIZE 32 /* Max slab size in MB */
+#else
+#define SPL_KMEM_CACHE_MAX_SIZE 4 /* Max slab size in MB */
+#endif
+
+#define SPL_MAX_ORDER (MAX_ORDER - 3)
+#define SPL_MAX_ORDER_NR_PAGES (1 << (SPL_MAX_ORDER - 1))
+
+#ifdef CONFIG_SLUB
+#define SPL_MAX_KMEM_CACHE_ORDER PAGE_ALLOC_COSTLY_ORDER
+#define SPL_MAX_KMEM_ORDER_NR_PAGES (1 << (SPL_MAX_KMEM_CACHE_ORDER - 1))
+#else
+#define SPL_MAX_KMEM_ORDER_NR_PAGES (KMALLOC_MAX_SIZE >> PAGE_SHIFT)
+#endif
+
+#define POINTER_IS_VALID(p) 0 /* Unimplemented */
+#define POINTER_INVALIDATE(pp) /* Unimplemented */
+
+typedef int (*spl_kmem_ctor_t)(void *, void *, int);
+typedef void (*spl_kmem_dtor_t)(void *, void *);
+typedef void (*spl_kmem_reclaim_t)(void *);
+
+typedef struct spl_kmem_magazine {
+ uint32_t skm_magic; /* Sanity magic */
+ uint32_t skm_avail; /* Available objects */
+ uint32_t skm_size; /* Magazine size */
+ uint32_t skm_refill; /* Batch refill size */
+ struct spl_kmem_cache *skm_cache; /* Owned by cache */
+ unsigned long skm_age; /* Last cache access */
+ unsigned int skm_cpu; /* Owned by cpu */
+ void *skm_objs[0]; /* Object pointers */
+} spl_kmem_magazine_t;
+
+typedef struct spl_kmem_obj {
+ uint32_t sko_magic; /* Sanity magic */
+ void *sko_addr; /* Buffer address */
+ struct spl_kmem_slab *sko_slab; /* Owned by slab */
+ struct list_head sko_list; /* Free object list linkage */
+} spl_kmem_obj_t;
+
+typedef struct spl_kmem_slab {
+ uint32_t sks_magic; /* Sanity magic */
+ uint32_t sks_objs; /* Objects per slab */
+ struct spl_kmem_cache *sks_cache; /* Owned by cache */
+ struct list_head sks_list; /* Slab list linkage */
+ struct list_head sks_free_list; /* Free object list */
+ unsigned long sks_age; /* Last modify jiffie */
+ uint32_t sks_ref; /* Ref count used objects */
+} spl_kmem_slab_t;
+
+typedef struct spl_kmem_alloc {
+ struct spl_kmem_cache *ska_cache; /* Owned by cache */
+ int ska_flags; /* Allocation flags */
+ taskq_ent_t ska_tqe; /* Task queue entry */
+} spl_kmem_alloc_t;
+
+typedef struct spl_kmem_emergency {
+ struct rb_node ske_node; /* Emergency tree linkage */
+ unsigned long ske_obj; /* Buffer address */
+} spl_kmem_emergency_t;
+
+typedef struct spl_kmem_cache {
+ uint32_t skc_magic; /* Sanity magic */
+ uint32_t skc_name_size; /* Name length */
+ char *skc_name; /* Name string */
+ spl_kmem_magazine_t **skc_mag; /* Per-CPU warm cache */
+ uint32_t skc_mag_size; /* Magazine size */
+ uint32_t skc_mag_refill; /* Magazine refill count */
+ spl_kmem_ctor_t skc_ctor; /* Constructor */
+ spl_kmem_dtor_t skc_dtor; /* Destructor */
+ spl_kmem_reclaim_t skc_reclaim; /* Reclaimator */
+ void *skc_private; /* Private data */
+ void *skc_vmp; /* Unused */
+ struct kmem_cache *skc_linux_cache; /* Linux slab cache if used */
+ unsigned long skc_flags; /* Flags */
+ uint32_t skc_obj_size; /* Object size */
+ uint32_t skc_obj_align; /* Object alignment */
+ uint32_t skc_slab_objs; /* Objects per slab */
+ uint32_t skc_slab_size; /* Slab size */
+ uint32_t skc_delay; /* Slab reclaim interval */
+ uint32_t skc_reap; /* Slab reclaim count */
+ atomic_t skc_ref; /* Ref count callers */
+ taskqid_t skc_taskqid; /* Slab reclaim task */
+ struct list_head skc_list; /* List of caches linkage */
+ struct list_head skc_complete_list; /* Completely alloc'ed */
+ struct list_head skc_partial_list; /* Partially alloc'ed */
+ struct rb_root skc_emergency_tree; /* Min sized objects */
+ spinlock_t skc_lock; /* Cache lock */
+ wait_queue_head_t skc_waitq; /* Allocation waiters */
+ uint64_t skc_slab_fail; /* Slab alloc failures */
+ uint64_t skc_slab_create; /* Slab creates */
+ uint64_t skc_slab_destroy; /* Slab destroys */
+ uint64_t skc_slab_total; /* Slab total current */
+ uint64_t skc_slab_alloc; /* Slab alloc current */
+ uint64_t skc_slab_max; /* Slab max historic */
+ uint64_t skc_obj_total; /* Obj total current */
+ uint64_t skc_obj_alloc; /* Obj alloc current */
+ uint64_t skc_obj_max; /* Obj max historic */
+ uint64_t skc_obj_deadlock; /* Obj emergency deadlocks */
+ uint64_t skc_obj_emergency; /* Obj emergency current */
+ uint64_t skc_obj_emergency_max; /* Obj emergency max */
+} spl_kmem_cache_t;
+#define kmem_cache_t spl_kmem_cache_t
+
+extern spl_kmem_cache_t *spl_kmem_cache_create(char *name, size_t size,
+ size_t align, spl_kmem_ctor_t ctor, spl_kmem_dtor_t dtor,
+ spl_kmem_reclaim_t reclaim, void *priv, void *vmp, int flags);
+extern void spl_kmem_cache_set_move(spl_kmem_cache_t *,
+ kmem_cbrc_t (*)(void *, void *, size_t, void *));
+extern void spl_kmem_cache_destroy(spl_kmem_cache_t *skc);
+extern void *spl_kmem_cache_alloc(spl_kmem_cache_t *skc, int flags);
+extern void spl_kmem_cache_free(spl_kmem_cache_t *skc, void *obj);
+extern void spl_kmem_cache_set_allocflags(spl_kmem_cache_t *skc, gfp_t flags);
+extern void spl_kmem_cache_reap_now(spl_kmem_cache_t *skc, int count);
+extern void spl_kmem_reap(void);
+
+#define kmem_cache_create(name, size, align, ctor, dtor, rclm, priv, vmp, fl) \
+ spl_kmem_cache_create(name, size, align, ctor, dtor, rclm, priv, vmp, fl)
+#define kmem_cache_set_move(skc, move) spl_kmem_cache_set_move(skc, move)
+#define kmem_cache_destroy(skc) spl_kmem_cache_destroy(skc)
+#define kmem_cache_alloc(skc, flags) spl_kmem_cache_alloc(skc, flags)
+#define kmem_cache_free(skc, obj) spl_kmem_cache_free(skc, obj)
+#define kmem_cache_reap_now(skc) \
+ spl_kmem_cache_reap_now(skc, skc->skc_reap)
+#define kmem_reap() spl_kmem_reap()
+
+/*
+ * The following functions are only available for internal use.
+ */
+extern int spl_kmem_cache_init(void);
+extern void spl_kmem_cache_fini(void);
+
+#endif /* _SPL_KMEM_CACHE_H */
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