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277 lines
7.2 KiB
277 lines
7.2 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* Internal definitions for FS-Cache |
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* |
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* Copyright (C) 2021 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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*/ |
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#ifdef pr_fmt |
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#undef pr_fmt |
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#endif |
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#define pr_fmt(fmt) "FS-Cache: " fmt |
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#include <linux/slab.h> |
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#include <linux/fscache-cache.h> |
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#include <trace/events/fscache.h> |
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#include <linux/sched.h> |
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#include <linux/seq_file.h> |
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/* |
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* cache.c |
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*/ |
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#ifdef CONFIG_PROC_FS |
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extern const struct seq_operations fscache_caches_seq_ops; |
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#endif |
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bool fscache_begin_cache_access(struct fscache_cache *cache, enum fscache_access_trace why); |
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void fscache_end_cache_access(struct fscache_cache *cache, enum fscache_access_trace why); |
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struct fscache_cache *fscache_lookup_cache(const char *name, bool is_cache); |
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void fscache_put_cache(struct fscache_cache *cache, enum fscache_cache_trace where); |
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static inline enum fscache_cache_state fscache_cache_state(const struct fscache_cache *cache) |
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{ |
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return smp_load_acquire(&cache->state); |
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} |
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static inline bool fscache_cache_is_live(const struct fscache_cache *cache) |
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{ |
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return fscache_cache_state(cache) == FSCACHE_CACHE_IS_ACTIVE; |
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} |
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static inline void fscache_set_cache_state(struct fscache_cache *cache, |
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enum fscache_cache_state new_state) |
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{ |
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smp_store_release(&cache->state, new_state); |
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} |
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static inline bool fscache_set_cache_state_maybe(struct fscache_cache *cache, |
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enum fscache_cache_state old_state, |
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enum fscache_cache_state new_state) |
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{ |
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return try_cmpxchg_release(&cache->state, &old_state, new_state); |
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} |
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/* |
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* cookie.c |
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*/ |
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extern struct kmem_cache *fscache_cookie_jar; |
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#ifdef CONFIG_PROC_FS |
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extern const struct seq_operations fscache_cookies_seq_ops; |
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#endif |
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extern struct timer_list fscache_cookie_lru_timer; |
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extern void fscache_print_cookie(struct fscache_cookie *cookie, char prefix); |
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extern bool fscache_begin_cookie_access(struct fscache_cookie *cookie, |
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enum fscache_access_trace why); |
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static inline void fscache_see_cookie(struct fscache_cookie *cookie, |
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enum fscache_cookie_trace where) |
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{ |
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trace_fscache_cookie(cookie->debug_id, refcount_read(&cookie->ref), |
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where); |
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} |
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/* |
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* main.c |
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*/ |
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extern unsigned fscache_debug; |
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extern unsigned int fscache_hash(unsigned int salt, const void *data, size_t len); |
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/* |
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* proc.c |
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*/ |
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#ifdef CONFIG_PROC_FS |
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extern int __init fscache_proc_init(void); |
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extern void fscache_proc_cleanup(void); |
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#else |
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#define fscache_proc_init() (0) |
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#define fscache_proc_cleanup() do {} while (0) |
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#endif |
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/* |
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* stats.c |
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*/ |
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#ifdef CONFIG_FSCACHE_STATS |
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extern atomic_t fscache_n_volumes; |
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extern atomic_t fscache_n_volumes_collision; |
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extern atomic_t fscache_n_volumes_nomem; |
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extern atomic_t fscache_n_cookies; |
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extern atomic_t fscache_n_cookies_lru; |
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extern atomic_t fscache_n_cookies_lru_expired; |
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extern atomic_t fscache_n_cookies_lru_removed; |
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extern atomic_t fscache_n_cookies_lru_dropped; |
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extern atomic_t fscache_n_acquires; |
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extern atomic_t fscache_n_acquires_ok; |
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extern atomic_t fscache_n_acquires_oom; |
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extern atomic_t fscache_n_invalidates; |
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extern atomic_t fscache_n_relinquishes; |
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extern atomic_t fscache_n_relinquishes_retire; |
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extern atomic_t fscache_n_relinquishes_dropped; |
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extern atomic_t fscache_n_resizes; |
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extern atomic_t fscache_n_resizes_null; |
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static inline void fscache_stat(atomic_t *stat) |
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{ |
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atomic_inc(stat); |
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} |
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static inline void fscache_stat_d(atomic_t *stat) |
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{ |
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atomic_dec(stat); |
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} |
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#define __fscache_stat(stat) (stat) |
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int fscache_stats_show(struct seq_file *m, void *v); |
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#else |
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#define __fscache_stat(stat) (NULL) |
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#define fscache_stat(stat) do {} while (0) |
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#define fscache_stat_d(stat) do {} while (0) |
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#endif |
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/* |
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* volume.c |
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*/ |
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#ifdef CONFIG_PROC_FS |
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extern const struct seq_operations fscache_volumes_seq_ops; |
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#endif |
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struct fscache_volume *fscache_get_volume(struct fscache_volume *volume, |
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enum fscache_volume_trace where); |
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void fscache_put_volume(struct fscache_volume *volume, |
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enum fscache_volume_trace where); |
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bool fscache_begin_volume_access(struct fscache_volume *volume, |
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struct fscache_cookie *cookie, |
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enum fscache_access_trace why); |
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void fscache_create_volume(struct fscache_volume *volume, bool wait); |
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/*****************************************************************************/ |
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/* |
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* debug tracing |
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*/ |
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#define dbgprintk(FMT, ...) \ |
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printk("[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__) |
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#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__) |
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#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__) |
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#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__) |
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#define kjournal(FMT, ...) no_printk(FMT, ##__VA_ARGS__) |
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#ifdef __KDEBUG |
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#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__) |
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#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__) |
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#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__) |
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#elif defined(CONFIG_FSCACHE_DEBUG) |
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#define _enter(FMT, ...) \ |
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do { \ |
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if (__do_kdebug(ENTER)) \ |
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kenter(FMT, ##__VA_ARGS__); \ |
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} while (0) |
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#define _leave(FMT, ...) \ |
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do { \ |
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if (__do_kdebug(LEAVE)) \ |
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kleave(FMT, ##__VA_ARGS__); \ |
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} while (0) |
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#define _debug(FMT, ...) \ |
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do { \ |
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if (__do_kdebug(DEBUG)) \ |
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kdebug(FMT, ##__VA_ARGS__); \ |
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} while (0) |
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#else |
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#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__) |
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#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__) |
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#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__) |
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#endif |
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/* |
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* determine whether a particular optional debugging point should be logged |
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* - we need to go through three steps to persuade cpp to correctly join the |
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* shorthand in FSCACHE_DEBUG_LEVEL with its prefix |
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*/ |
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#define ____do_kdebug(LEVEL, POINT) \ |
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unlikely((fscache_debug & \ |
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(FSCACHE_POINT_##POINT << (FSCACHE_DEBUG_ ## LEVEL * 3)))) |
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#define ___do_kdebug(LEVEL, POINT) \ |
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____do_kdebug(LEVEL, POINT) |
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#define __do_kdebug(POINT) \ |
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___do_kdebug(FSCACHE_DEBUG_LEVEL, POINT) |
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#define FSCACHE_DEBUG_CACHE 0 |
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#define FSCACHE_DEBUG_COOKIE 1 |
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#define FSCACHE_DEBUG_OBJECT 2 |
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#define FSCACHE_DEBUG_OPERATION 3 |
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#define FSCACHE_POINT_ENTER 1 |
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#define FSCACHE_POINT_LEAVE 2 |
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#define FSCACHE_POINT_DEBUG 4 |
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#ifndef FSCACHE_DEBUG_LEVEL |
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#define FSCACHE_DEBUG_LEVEL CACHE |
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#endif |
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/* |
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* assertions |
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*/ |
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#if 1 /* defined(__KDEBUGALL) */ |
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#define ASSERT(X) \ |
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do { \ |
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if (unlikely(!(X))) { \ |
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pr_err("\n"); \ |
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pr_err("Assertion failed\n"); \ |
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BUG(); \ |
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} \ |
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} while (0) |
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#define ASSERTCMP(X, OP, Y) \ |
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do { \ |
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if (unlikely(!((X) OP (Y)))) { \ |
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pr_err("\n"); \ |
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pr_err("Assertion failed\n"); \ |
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pr_err("%lx " #OP " %lx is false\n", \ |
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(unsigned long)(X), (unsigned long)(Y)); \ |
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BUG(); \ |
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} \ |
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} while (0) |
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#define ASSERTIF(C, X) \ |
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do { \ |
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if (unlikely((C) && !(X))) { \ |
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pr_err("\n"); \ |
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pr_err("Assertion failed\n"); \ |
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BUG(); \ |
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} \ |
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} while (0) |
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#define ASSERTIFCMP(C, X, OP, Y) \ |
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do { \ |
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if (unlikely((C) && !((X) OP (Y)))) { \ |
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pr_err("\n"); \ |
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pr_err("Assertion failed\n"); \ |
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pr_err("%lx " #OP " %lx is false\n", \ |
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(unsigned long)(X), (unsigned long)(Y)); \ |
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BUG(); \ |
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} \ |
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} while (0) |
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#else |
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#define ASSERT(X) do {} while (0) |
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#define ASSERTCMP(X, OP, Y) do {} while (0) |
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#define ASSERTIF(C, X) do {} while (0) |
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#define ASSERTIFCMP(C, X, OP, Y) do {} while (0) |
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#endif /* assert or not */
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