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12#include <linux/fscache-cache.h>
13#include <linux/timer.h>
14#include <linux/wait.h>
15#include <linux/workqueue.h>
16#include <linux/security.h>
17
18struct cachefiles_cache;
19struct cachefiles_object;
20
21extern unsigned cachefiles_debug;
22#define CACHEFILES_DEBUG_KENTER 1
23#define CACHEFILES_DEBUG_KLEAVE 2
24#define CACHEFILES_DEBUG_KDEBUG 4
25
26
27
28
29struct cachefiles_object {
30 struct fscache_object fscache;
31 struct cachefiles_lookup_data *lookup_data;
32 struct dentry *dentry;
33 struct dentry *backer;
34 loff_t i_size;
35 unsigned long flags;
36#define CACHEFILES_OBJECT_ACTIVE 0
37#define CACHEFILES_OBJECT_BURIED 1
38 atomic_t usage;
39 uint8_t type;
40 uint8_t new;
41 spinlock_t work_lock;
42 struct rb_node active_node;
43};
44
45extern struct kmem_cache *cachefiles_object_jar;
46
47
48
49
50struct cachefiles_cache {
51 struct fscache_cache cache;
52 struct vfsmount *mnt;
53 struct dentry *graveyard;
54 struct file *cachefilesd;
55 const struct cred *cache_cred;
56 struct mutex daemon_mutex;
57 wait_queue_head_t daemon_pollwq;
58 struct rb_root active_nodes;
59 rwlock_t active_lock;
60 atomic_t gravecounter;
61 unsigned frun_percent;
62 unsigned fcull_percent;
63 unsigned fstop_percent;
64 unsigned brun_percent;
65 unsigned bcull_percent;
66 unsigned bstop_percent;
67 unsigned bsize;
68 unsigned bshift;
69 uint64_t frun;
70 uint64_t fcull;
71 uint64_t fstop;
72 sector_t brun;
73 sector_t bcull;
74 sector_t bstop;
75 unsigned long flags;
76#define CACHEFILES_READY 0
77#define CACHEFILES_DEAD 1
78#define CACHEFILES_CULLING 2
79#define CACHEFILES_STATE_CHANGED 3
80 char *rootdirname;
81 char *secctx;
82 char *tag;
83};
84
85
86
87
88struct cachefiles_one_read {
89 wait_queue_t monitor;
90 struct page *back_page;
91 struct page *netfs_page;
92 struct fscache_retrieval *op;
93 struct list_head op_link;
94};
95
96
97
98
99struct cachefiles_one_write {
100 struct page *netfs_page;
101 struct cachefiles_object *object;
102 struct list_head obj_link;
103 fscache_rw_complete_t end_io_func;
104 void *context;
105};
106
107
108
109
110struct cachefiles_xattr {
111 uint16_t len;
112 uint8_t type;
113 uint8_t data[];
114};
115
116
117
118
119static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
120{
121 set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
122 wake_up_all(&cache->daemon_pollwq);
123}
124
125
126
127
128extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
129extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
130
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132
133
134extern const struct file_operations cachefiles_daemon_fops;
135
136extern int cachefiles_has_space(struct cachefiles_cache *cache,
137 unsigned fnr, unsigned bnr);
138
139
140
141
142extern const struct fscache_cache_ops cachefiles_cache_ops;
143
144
145
146
147extern char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type);
148
149
150
151
152extern int cachefiles_delete_object(struct cachefiles_cache *cache,
153 struct cachefiles_object *object);
154extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
155 struct cachefiles_object *object,
156 const char *key,
157 struct cachefiles_xattr *auxdata);
158extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
159 struct dentry *dir,
160 const char *name);
161
162extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
163 char *filename);
164
165extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
166 struct dentry *dir, char *filename);
167
168
169
170
171#ifdef CONFIG_CACHEFILES_HISTOGRAM
172extern atomic_t cachefiles_lookup_histogram[HZ];
173extern atomic_t cachefiles_mkdir_histogram[HZ];
174extern atomic_t cachefiles_create_histogram[HZ];
175
176extern int __init cachefiles_proc_init(void);
177extern void cachefiles_proc_cleanup(void);
178static inline
179void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
180{
181 unsigned long jif = jiffies - start_jif;
182 if (jif >= HZ)
183 jif = HZ - 1;
184 atomic_inc(&histogram[jif]);
185}
186
187#else
188#define cachefiles_proc_init() (0)
189#define cachefiles_proc_cleanup() do {} while (0)
190#define cachefiles_hist(hist, start_jif) do {} while (0)
191#endif
192
193
194
195
196extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
197 struct page *, gfp_t);
198extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
199 struct list_head *, unsigned *,
200 gfp_t);
201extern int cachefiles_allocate_page(struct fscache_retrieval *, struct page *,
202 gfp_t);
203extern int cachefiles_allocate_pages(struct fscache_retrieval *,
204 struct list_head *, unsigned *, gfp_t);
205extern int cachefiles_write_page(struct fscache_storage *, struct page *);
206extern void cachefiles_uncache_page(struct fscache_object *, struct page *);
207
208
209
210
211extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
212extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
213 struct dentry *root,
214 const struct cred **_saved_cred);
215
216static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
217 const struct cred **_saved_cred)
218{
219 *_saved_cred = override_creds(cache->cache_cred);
220}
221
222static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
223 const struct cred *saved_cred)
224{
225 revert_creds(saved_cred);
226}
227
228
229
230
231extern int cachefiles_check_object_type(struct cachefiles_object *object);
232extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
233 struct cachefiles_xattr *auxdata);
234extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
235 struct cachefiles_xattr *auxdata);
236extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
237 struct cachefiles_xattr *auxdata);
238extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
239 struct dentry *dentry);
240
241
242
243
244
245#define kerror(FMT, ...) printk(KERN_ERR "CacheFiles: "FMT"\n", ##__VA_ARGS__)
246
247#define cachefiles_io_error(___cache, FMT, ...) \
248do { \
249 kerror("I/O Error: " FMT, ##__VA_ARGS__); \
250 fscache_io_error(&(___cache)->cache); \
251 set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
252} while (0)
253
254#define cachefiles_io_error_obj(object, FMT, ...) \
255do { \
256 struct cachefiles_cache *___cache; \
257 \
258 ___cache = container_of((object)->fscache.cache, \
259 struct cachefiles_cache, cache); \
260 cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
261} while (0)
262
263
264
265
266
267#define dbgprintk(FMT, ...) \
268 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
269
270#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
271#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
272#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
273
274
275#if defined(__KDEBUG)
276#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
277#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
278#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
279
280#elif defined(CONFIG_CACHEFILES_DEBUG)
281#define _enter(FMT, ...) \
282do { \
283 if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
284 kenter(FMT, ##__VA_ARGS__); \
285} while (0)
286
287#define _leave(FMT, ...) \
288do { \
289 if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
290 kleave(FMT, ##__VA_ARGS__); \
291} while (0)
292
293#define _debug(FMT, ...) \
294do { \
295 if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
296 kdebug(FMT, ##__VA_ARGS__); \
297} while (0)
298
299#else
300#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
301#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
302#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
303#endif
304
305#if 1
306
307#define ASSERT(X) \
308do { \
309 if (unlikely(!(X))) { \
310 printk(KERN_ERR "\n"); \
311 printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
312 BUG(); \
313 } \
314} while (0)
315
316#define ASSERTCMP(X, OP, Y) \
317do { \
318 if (unlikely(!((X) OP (Y)))) { \
319 printk(KERN_ERR "\n"); \
320 printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
321 printk(KERN_ERR "%lx " #OP " %lx is false\n", \
322 (unsigned long)(X), (unsigned long)(Y)); \
323 BUG(); \
324 } \
325} while (0)
326
327#define ASSERTIF(C, X) \
328do { \
329 if (unlikely((C) && !(X))) { \
330 printk(KERN_ERR "\n"); \
331 printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
332 BUG(); \
333 } \
334} while (0)
335
336#define ASSERTIFCMP(C, X, OP, Y) \
337do { \
338 if (unlikely((C) && !((X) OP (Y)))) { \
339 printk(KERN_ERR "\n"); \
340 printk(KERN_ERR "CacheFiles: Assertion failed\n"); \
341 printk(KERN_ERR "%lx " #OP " %lx is false\n", \
342 (unsigned long)(X), (unsigned long)(Y)); \
343 BUG(); \
344 } \
345} while (0)
346
347#else
348
349#define ASSERT(X) do {} while (0)
350#define ASSERTCMP(X, OP, Y) do {} while (0)
351#define ASSERTIF(C, X) do {} while (0)
352#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
353
354#endif
355