^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * Copyright (C) 2012 Red Hat. All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * This file is released under the GPL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include "dm-cache-policy-internal.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include "dm.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) /*----------------------------------------------------------------*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #define DM_MSG_PREFIX "cache-policy"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) static DEFINE_SPINLOCK(register_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) static LIST_HEAD(register_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) static struct dm_cache_policy_type *__find_policy(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) struct dm_cache_policy_type *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) list_for_each_entry(t, ®ister_list, list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) if (!strcmp(t->name, name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) static struct dm_cache_policy_type *__get_policy_once(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct dm_cache_policy_type *t = __find_policy(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) if (t && !try_module_get(t->owner)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) DMWARN("couldn't get module %s", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) t = ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static struct dm_cache_policy_type *get_policy_once(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct dm_cache_policy_type *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) spin_lock(®ister_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) t = __get_policy_once(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) spin_unlock(®ister_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static struct dm_cache_policy_type *get_policy(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) struct dm_cache_policy_type *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) t = get_policy_once(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (IS_ERR(t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) if (t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) request_module("dm-cache-%s", name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) t = get_policy_once(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (IS_ERR(t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) static void put_policy(struct dm_cache_policy_type *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) module_put(t->owner);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) int dm_cache_policy_register(struct dm_cache_policy_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) int r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) /* One size fits all for now */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) if (type->hint_size != 0 && type->hint_size != 4) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) DMWARN("hint size must be 0 or 4 but %llu supplied.", (unsigned long long) type->hint_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) spin_lock(®ister_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) if (__find_policy(type->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) DMWARN("attempt to register policy under duplicate name %s", type->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) r = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) list_add(&type->list, ®ister_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) r = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) spin_unlock(®ister_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) return r;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) EXPORT_SYMBOL_GPL(dm_cache_policy_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) void dm_cache_policy_unregister(struct dm_cache_policy_type *type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) spin_lock(®ister_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) list_del_init(&type->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) spin_unlock(®ister_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) EXPORT_SYMBOL_GPL(dm_cache_policy_unregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) struct dm_cache_policy *dm_cache_policy_create(const char *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) dm_cblock_t cache_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) sector_t origin_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) sector_t cache_block_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) struct dm_cache_policy *p = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct dm_cache_policy_type *type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) type = get_policy(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) if (!type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) DMWARN("unknown policy type");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) return ERR_PTR(-EINVAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) p = type->create(cache_size, origin_size, cache_block_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!p) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) put_policy(type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return ERR_PTR(-ENOMEM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) p->private = type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) EXPORT_SYMBOL_GPL(dm_cache_policy_create);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) void dm_cache_policy_destroy(struct dm_cache_policy *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) struct dm_cache_policy_type *t = p->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) p->destroy(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) put_policy(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) EXPORT_SYMBOL_GPL(dm_cache_policy_destroy);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) const char *dm_cache_policy_get_name(struct dm_cache_policy *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct dm_cache_policy_type *t = p->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) /* if t->real is set then an alias was used (e.g. "default") */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) if (t->real)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return t->real->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) return t->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) EXPORT_SYMBOL_GPL(dm_cache_policy_get_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) const unsigned *dm_cache_policy_get_version(struct dm_cache_policy *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct dm_cache_policy_type *t = p->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return t->version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) EXPORT_SYMBOL_GPL(dm_cache_policy_get_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) struct dm_cache_policy_type *t = p->private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) return t->hint_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) EXPORT_SYMBOL_GPL(dm_cache_policy_get_hint_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) /*----------------------------------------------------------------*/
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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