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9ae326a6 DH |
1 | /* General netfs cache on cache files internal defs |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public Licence | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the Licence, or (at your option) any later version. | |
10 | */ | |
11 | ||
0227d6ab FF |
12 | #ifdef pr_fmt |
13 | #undef pr_fmt | |
14 | #endif | |
15 | ||
16 | #define pr_fmt(fmt) "CacheFiles: " fmt | |
17 | ||
18 | ||
9ae326a6 DH |
19 | #include <linux/fscache-cache.h> |
20 | #include <linux/timer.h> | |
21 | #include <linux/wait.h> | |
22 | #include <linux/workqueue.h> | |
23 | #include <linux/security.h> | |
24 | ||
25 | struct cachefiles_cache; | |
26 | struct cachefiles_object; | |
27 | ||
28 | extern unsigned cachefiles_debug; | |
29 | #define CACHEFILES_DEBUG_KENTER 1 | |
30 | #define CACHEFILES_DEBUG_KLEAVE 2 | |
31 | #define CACHEFILES_DEBUG_KDEBUG 4 | |
32 | ||
71baba4b | 33 | #define cachefiles_gfp (__GFP_RECLAIM | __GFP_NORETRY | __GFP_NOMEMALLOC) |
5f4f9f4a | 34 | |
9ae326a6 DH |
35 | /* |
36 | * node records | |
37 | */ | |
38 | struct cachefiles_object { | |
39 | struct fscache_object fscache; /* fscache handle */ | |
40 | struct cachefiles_lookup_data *lookup_data; /* cached lookup data */ | |
41 | struct dentry *dentry; /* the file/dir representing this object */ | |
42 | struct dentry *backer; /* backing file */ | |
43 | loff_t i_size; /* object size */ | |
44 | unsigned long flags; | |
45 | #define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */ | |
46 | atomic_t usage; /* object usage count */ | |
47 | uint8_t type; /* object type */ | |
48 | uint8_t new; /* T if object new */ | |
49 | spinlock_t work_lock; | |
50 | struct rb_node active_node; /* link in active tree (dentry is key) */ | |
51 | }; | |
52 | ||
53 | extern struct kmem_cache *cachefiles_object_jar; | |
54 | ||
55 | /* | |
56 | * Cache files cache definition | |
57 | */ | |
58 | struct cachefiles_cache { | |
59 | struct fscache_cache cache; /* FS-Cache record */ | |
60 | struct vfsmount *mnt; /* mountpoint holding the cache */ | |
61 | struct dentry *graveyard; /* directory into which dead objects go */ | |
62 | struct file *cachefilesd; /* manager daemon handle */ | |
63 | const struct cred *cache_cred; /* security override for accessing cache */ | |
64 | struct mutex daemon_mutex; /* command serialisation mutex */ | |
65 | wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */ | |
66 | struct rb_root active_nodes; /* active nodes (can't be culled) */ | |
67 | rwlock_t active_lock; /* lock for active_nodes */ | |
68 | atomic_t gravecounter; /* graveyard uniquifier */ | |
a5b3a80b DH |
69 | atomic_t f_released; /* number of objects released lately */ |
70 | atomic_long_t b_released; /* number of blocks released lately */ | |
9ae326a6 DH |
71 | unsigned frun_percent; /* when to stop culling (% files) */ |
72 | unsigned fcull_percent; /* when to start culling (% files) */ | |
73 | unsigned fstop_percent; /* when to stop allocating (% files) */ | |
74 | unsigned brun_percent; /* when to stop culling (% blocks) */ | |
75 | unsigned bcull_percent; /* when to start culling (% blocks) */ | |
76 | unsigned bstop_percent; /* when to stop allocating (% blocks) */ | |
77 | unsigned bsize; /* cache's block size */ | |
78 | unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */ | |
79 | uint64_t frun; /* when to stop culling */ | |
80 | uint64_t fcull; /* when to start culling */ | |
81 | uint64_t fstop; /* when to stop allocating */ | |
82 | sector_t brun; /* when to stop culling */ | |
83 | sector_t bcull; /* when to start culling */ | |
84 | sector_t bstop; /* when to stop allocating */ | |
85 | unsigned long flags; | |
86 | #define CACHEFILES_READY 0 /* T if cache prepared */ | |
87 | #define CACHEFILES_DEAD 1 /* T if cache dead */ | |
88 | #define CACHEFILES_CULLING 2 /* T if cull engaged */ | |
89 | #define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */ | |
90 | char *rootdirname; /* name of cache root directory */ | |
91 | char *secctx; /* LSM security context */ | |
92 | char *tag; /* cache binding tag */ | |
93 | }; | |
94 | ||
95 | /* | |
96 | * backing file read tracking | |
97 | */ | |
98 | struct cachefiles_one_read { | |
99 | wait_queue_t monitor; /* link into monitored waitqueue */ | |
100 | struct page *back_page; /* backing file page we're waiting for */ | |
101 | struct page *netfs_page; /* netfs page we're going to fill */ | |
102 | struct fscache_retrieval *op; /* retrieval op covering this */ | |
103 | struct list_head op_link; /* link in op's todo list */ | |
104 | }; | |
105 | ||
106 | /* | |
107 | * backing file write tracking | |
108 | */ | |
109 | struct cachefiles_one_write { | |
110 | struct page *netfs_page; /* netfs page to copy */ | |
111 | struct cachefiles_object *object; | |
112 | struct list_head obj_link; /* link in object's lists */ | |
113 | fscache_rw_complete_t end_io_func; | |
114 | void *context; | |
115 | }; | |
116 | ||
117 | /* | |
118 | * auxiliary data xattr buffer | |
119 | */ | |
120 | struct cachefiles_xattr { | |
121 | uint16_t len; | |
122 | uint8_t type; | |
123 | uint8_t data[]; | |
124 | }; | |
125 | ||
126 | /* | |
127 | * note change of state for daemon | |
128 | */ | |
129 | static inline void cachefiles_state_changed(struct cachefiles_cache *cache) | |
130 | { | |
131 | set_bit(CACHEFILES_STATE_CHANGED, &cache->flags); | |
132 | wake_up_all(&cache->daemon_pollwq); | |
133 | } | |
134 | ||
135 | /* | |
911e690e | 136 | * bind.c |
9ae326a6 DH |
137 | */ |
138 | extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args); | |
139 | extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache); | |
140 | ||
141 | /* | |
911e690e | 142 | * daemon.c |
9ae326a6 DH |
143 | */ |
144 | extern const struct file_operations cachefiles_daemon_fops; | |
145 | ||
146 | extern int cachefiles_has_space(struct cachefiles_cache *cache, | |
147 | unsigned fnr, unsigned bnr); | |
148 | ||
149 | /* | |
911e690e | 150 | * interface.c |
9ae326a6 DH |
151 | */ |
152 | extern const struct fscache_cache_ops cachefiles_cache_ops; | |
153 | ||
154 | /* | |
911e690e | 155 | * key.c |
9ae326a6 DH |
156 | */ |
157 | extern char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type); | |
158 | ||
159 | /* | |
911e690e | 160 | * namei.c |
9ae326a6 | 161 | */ |
a5b3a80b DH |
162 | extern void cachefiles_mark_object_inactive(struct cachefiles_cache *cache, |
163 | struct cachefiles_object *object); | |
9ae326a6 DH |
164 | extern int cachefiles_delete_object(struct cachefiles_cache *cache, |
165 | struct cachefiles_object *object); | |
166 | extern int cachefiles_walk_to_object(struct cachefiles_object *parent, | |
167 | struct cachefiles_object *object, | |
168 | const char *key, | |
169 | struct cachefiles_xattr *auxdata); | |
170 | extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache, | |
171 | struct dentry *dir, | |
172 | const char *name); | |
173 | ||
174 | extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir, | |
175 | char *filename); | |
176 | ||
177 | extern int cachefiles_check_in_use(struct cachefiles_cache *cache, | |
178 | struct dentry *dir, char *filename); | |
179 | ||
180 | /* | |
911e690e | 181 | * proc.c |
9ae326a6 DH |
182 | */ |
183 | #ifdef CONFIG_CACHEFILES_HISTOGRAM | |
184 | extern atomic_t cachefiles_lookup_histogram[HZ]; | |
185 | extern atomic_t cachefiles_mkdir_histogram[HZ]; | |
186 | extern atomic_t cachefiles_create_histogram[HZ]; | |
187 | ||
188 | extern int __init cachefiles_proc_init(void); | |
189 | extern void cachefiles_proc_cleanup(void); | |
190 | static inline | |
191 | void cachefiles_hist(atomic_t histogram[], unsigned long start_jif) | |
192 | { | |
193 | unsigned long jif = jiffies - start_jif; | |
194 | if (jif >= HZ) | |
195 | jif = HZ - 1; | |
196 | atomic_inc(&histogram[jif]); | |
197 | } | |
198 | ||
199 | #else | |
200 | #define cachefiles_proc_init() (0) | |
201 | #define cachefiles_proc_cleanup() do {} while (0) | |
202 | #define cachefiles_hist(hist, start_jif) do {} while (0) | |
203 | #endif | |
204 | ||
205 | /* | |
911e690e | 206 | * rdwr.c |
9ae326a6 DH |
207 | */ |
208 | extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *, | |
209 | struct page *, gfp_t); | |
210 | extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *, | |
211 | struct list_head *, unsigned *, | |
212 | gfp_t); | |
213 | extern int cachefiles_allocate_page(struct fscache_retrieval *, struct page *, | |
214 | gfp_t); | |
215 | extern int cachefiles_allocate_pages(struct fscache_retrieval *, | |
216 | struct list_head *, unsigned *, gfp_t); | |
217 | extern int cachefiles_write_page(struct fscache_storage *, struct page *); | |
218 | extern void cachefiles_uncache_page(struct fscache_object *, struct page *); | |
219 | ||
220 | /* | |
911e690e | 221 | * security.c |
9ae326a6 DH |
222 | */ |
223 | extern int cachefiles_get_security_ID(struct cachefiles_cache *cache); | |
224 | extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache, | |
225 | struct dentry *root, | |
226 | const struct cred **_saved_cred); | |
227 | ||
228 | static inline void cachefiles_begin_secure(struct cachefiles_cache *cache, | |
229 | const struct cred **_saved_cred) | |
230 | { | |
231 | *_saved_cred = override_creds(cache->cache_cred); | |
232 | } | |
233 | ||
234 | static inline void cachefiles_end_secure(struct cachefiles_cache *cache, | |
235 | const struct cred *saved_cred) | |
236 | { | |
237 | revert_creds(saved_cred); | |
238 | } | |
239 | ||
240 | /* | |
911e690e | 241 | * xattr.c |
9ae326a6 DH |
242 | */ |
243 | extern int cachefiles_check_object_type(struct cachefiles_object *object); | |
244 | extern int cachefiles_set_object_xattr(struct cachefiles_object *object, | |
245 | struct cachefiles_xattr *auxdata); | |
246 | extern int cachefiles_update_object_xattr(struct cachefiles_object *object, | |
247 | struct cachefiles_xattr *auxdata); | |
5002d7be | 248 | extern int cachefiles_check_auxdata(struct cachefiles_object *object); |
9ae326a6 DH |
249 | extern int cachefiles_check_object_xattr(struct cachefiles_object *object, |
250 | struct cachefiles_xattr *auxdata); | |
251 | extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache, | |
252 | struct dentry *dentry); | |
253 | ||
254 | ||
255 | /* | |
256 | * error handling | |
257 | */ | |
9ae326a6 DH |
258 | |
259 | #define cachefiles_io_error(___cache, FMT, ...) \ | |
260 | do { \ | |
6ff66ac7 | 261 | pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \ |
9ae326a6 DH |
262 | fscache_io_error(&(___cache)->cache); \ |
263 | set_bit(CACHEFILES_DEAD, &(___cache)->flags); \ | |
264 | } while (0) | |
265 | ||
266 | #define cachefiles_io_error_obj(object, FMT, ...) \ | |
267 | do { \ | |
268 | struct cachefiles_cache *___cache; \ | |
269 | \ | |
270 | ___cache = container_of((object)->fscache.cache, \ | |
271 | struct cachefiles_cache, cache); \ | |
272 | cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \ | |
273 | } while (0) | |
274 | ||
275 | ||
276 | /* | |
277 | * debug tracing | |
278 | */ | |
279 | #define dbgprintk(FMT, ...) \ | |
280 | printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__) | |
281 | ||
9ae326a6 DH |
282 | #define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__) |
283 | #define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__) | |
284 | #define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__) | |
285 | ||
286 | ||
287 | #if defined(__KDEBUG) | |
288 | #define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__) | |
289 | #define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__) | |
290 | #define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__) | |
291 | ||
292 | #elif defined(CONFIG_CACHEFILES_DEBUG) | |
293 | #define _enter(FMT, ...) \ | |
294 | do { \ | |
295 | if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \ | |
296 | kenter(FMT, ##__VA_ARGS__); \ | |
297 | } while (0) | |
298 | ||
299 | #define _leave(FMT, ...) \ | |
300 | do { \ | |
301 | if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \ | |
302 | kleave(FMT, ##__VA_ARGS__); \ | |
303 | } while (0) | |
304 | ||
305 | #define _debug(FMT, ...) \ | |
306 | do { \ | |
307 | if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \ | |
308 | kdebug(FMT, ##__VA_ARGS__); \ | |
309 | } while (0) | |
310 | ||
311 | #else | |
12fdff3f DH |
312 | #define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__) |
313 | #define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__) | |
314 | #define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__) | |
9ae326a6 DH |
315 | #endif |
316 | ||
317 | #if 1 /* defined(__KDEBUGALL) */ | |
318 | ||
319 | #define ASSERT(X) \ | |
320 | do { \ | |
321 | if (unlikely(!(X))) { \ | |
4e1eb883 | 322 | pr_err("\n"); \ |
0227d6ab | 323 | pr_err("Assertion failed\n"); \ |
9ae326a6 DH |
324 | BUG(); \ |
325 | } \ | |
326 | } while (0) | |
327 | ||
328 | #define ASSERTCMP(X, OP, Y) \ | |
329 | do { \ | |
330 | if (unlikely(!((X) OP (Y)))) { \ | |
4e1eb883 | 331 | pr_err("\n"); \ |
0227d6ab | 332 | pr_err("Assertion failed\n"); \ |
4e1eb883 | 333 | pr_err("%lx " #OP " %lx is false\n", \ |
9ae326a6 DH |
334 | (unsigned long)(X), (unsigned long)(Y)); \ |
335 | BUG(); \ | |
336 | } \ | |
337 | } while (0) | |
338 | ||
339 | #define ASSERTIF(C, X) \ | |
340 | do { \ | |
341 | if (unlikely((C) && !(X))) { \ | |
4e1eb883 | 342 | pr_err("\n"); \ |
0227d6ab | 343 | pr_err("Assertion failed\n"); \ |
9ae326a6 DH |
344 | BUG(); \ |
345 | } \ | |
346 | } while (0) | |
347 | ||
348 | #define ASSERTIFCMP(C, X, OP, Y) \ | |
349 | do { \ | |
350 | if (unlikely((C) && !((X) OP (Y)))) { \ | |
4e1eb883 | 351 | pr_err("\n"); \ |
0227d6ab | 352 | pr_err("Assertion failed\n"); \ |
4e1eb883 | 353 | pr_err("%lx " #OP " %lx is false\n", \ |
9ae326a6 DH |
354 | (unsigned long)(X), (unsigned long)(Y)); \ |
355 | BUG(); \ | |
356 | } \ | |
357 | } while (0) | |
358 | ||
359 | #else | |
360 | ||
361 | #define ASSERT(X) do {} while (0) | |
362 | #define ASSERTCMP(X, OP, Y) do {} while (0) | |
363 | #define ASSERTIF(C, X) do {} while (0) | |
364 | #define ASSERTIFCMP(C, X, OP, Y) do {} while (0) | |
365 | ||
366 | #endif |