mbcache.c (b73077eb03f510a84b102fb97640e595a958403c) mbcache.c (1495f230fa7750479c79e3656286b9183d662077)
1/*
2 * linux/fs/mbcache.c
3 * (C) 2001-2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
4 */
5
6/*
7 * Filesystem Meta Information Block Cache (mbcache)
8 *

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85static LIST_HEAD(mb_cache_list);
86static LIST_HEAD(mb_cache_lru_list);
87static DEFINE_SPINLOCK(mb_cache_spinlock);
88
89/*
90 * What the mbcache registers as to get shrunk dynamically.
91 */
92
1/*
2 * linux/fs/mbcache.c
3 * (C) 2001-2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
4 */
5
6/*
7 * Filesystem Meta Information Block Cache (mbcache)
8 *

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85static LIST_HEAD(mb_cache_list);
86static LIST_HEAD(mb_cache_lru_list);
87static DEFINE_SPINLOCK(mb_cache_spinlock);
88
89/*
90 * What the mbcache registers as to get shrunk dynamically.
91 */
92
93static int mb_cache_shrink_fn(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask);
93static int mb_cache_shrink_fn(struct shrinker *shrink,
94 struct shrink_control *sc);
94
95static struct shrinker mb_cache_shrinker = {
96 .shrink = mb_cache_shrink_fn,
97 .seeks = DEFAULT_SEEKS,
98};
99
100static inline int
101__mb_cache_entry_is_hashed(struct mb_cache_entry *ce)

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151
152/*
153 * mb_cache_shrink_fn() memory pressure callback
154 *
155 * This function is called by the kernel memory management when memory
156 * gets low.
157 *
158 * @shrink: (ignored)
95
96static struct shrinker mb_cache_shrinker = {
97 .shrink = mb_cache_shrink_fn,
98 .seeks = DEFAULT_SEEKS,
99};
100
101static inline int
102__mb_cache_entry_is_hashed(struct mb_cache_entry *ce)

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152
153/*
154 * mb_cache_shrink_fn() memory pressure callback
155 *
156 * This function is called by the kernel memory management when memory
157 * gets low.
158 *
159 * @shrink: (ignored)
159 * @nr_to_scan: Number of objects to scan
160 * @gfp_mask: (ignored)
160 * @sc: shrink_control passed from reclaim
161 *
162 * Returns the number of objects which are present in the cache.
163 */
164static int
161 *
162 * Returns the number of objects which are present in the cache.
163 */
164static int
165mb_cache_shrink_fn(struct shrinker *shrink, int nr_to_scan, gfp_t gfp_mask)
165mb_cache_shrink_fn(struct shrinker *shrink, struct shrink_control *sc)
166{
167 LIST_HEAD(free_list);
168 struct mb_cache *cache;
169 struct mb_cache_entry *entry, *tmp;
170 int count = 0;
166{
167 LIST_HEAD(free_list);
168 struct mb_cache *cache;
169 struct mb_cache_entry *entry, *tmp;
170 int count = 0;
171 int nr_to_scan = sc->nr_to_scan;
172 gfp_t gfp_mask = sc->gfp_mask;
171
172 mb_debug("trying to free %d entries", nr_to_scan);
173 spin_lock(&mb_cache_spinlock);
174 while (nr_to_scan-- && !list_empty(&mb_cache_lru_list)) {
175 struct mb_cache_entry *ce =
176 list_entry(mb_cache_lru_list.next,
177 struct mb_cache_entry, e_lru_list);
178 list_move_tail(&ce->e_lru_list, &free_list);

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174 mb_debug("trying to free %d entries", nr_to_scan);
175 spin_lock(&mb_cache_spinlock);
176 while (nr_to_scan-- && !list_empty(&mb_cache_lru_list)) {
177 struct mb_cache_entry *ce =
178 list_entry(mb_cache_lru_list.next,
179 struct mb_cache_entry, e_lru_list);
180 list_move_tail(&ce->e_lru_list, &free_list);

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