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1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/* General netfs cache on cache files internal defs
3 *
4 * Copyright (C) 2021 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#ifdef pr_fmt
9#undef pr_fmt
10#endif
11
12#define pr_fmt(fmt) "CacheFiles: " fmt
13
14
15#include <linux/fscache-cache.h>
16#include <linux/cred.h>
17#include <linux/security.h>
18#include <linux/xarray.h>
19#include <linux/cachefiles.h>
20
21#define CACHEFILES_DIO_BLOCK_SIZE 4096
22
23struct cachefiles_cache;
24struct cachefiles_object;
25
26enum cachefiles_content {
27 /* These values are saved on disk */
28 CACHEFILES_CONTENT_NO_DATA = 0, /* No content stored */
29 CACHEFILES_CONTENT_SINGLE = 1, /* Content is monolithic, all is present */
30 CACHEFILES_CONTENT_ALL = 2, /* Content is all present, no map */
31 CACHEFILES_CONTENT_BACKFS_MAP = 3, /* Content is piecemeal, mapped through backing fs */
32 CACHEFILES_CONTENT_DIRTY = 4, /* Content is dirty (only seen on disk) */
33 nr__cachefiles_content
34};
35
36/*
37 * Cached volume representation.
38 */
39struct cachefiles_volume {
40 struct cachefiles_cache *cache;
41 struct list_head cache_link; /* Link in cache->volumes */
42 struct fscache_volume *vcookie; /* The netfs's representation */
43 struct dentry *dentry; /* The volume dentry */
44 struct dentry *fanout[256]; /* Fanout subdirs */
45};
46
47enum cachefiles_object_state {
48 CACHEFILES_ONDEMAND_OBJSTATE_CLOSE, /* Anonymous fd closed by daemon or initial state */
49 CACHEFILES_ONDEMAND_OBJSTATE_OPEN, /* Anonymous fd associated with object is available */
50 CACHEFILES_ONDEMAND_OBJSTATE_REOPENING, /* Object that was closed and is being reopened. */
51};
52
53struct cachefiles_ondemand_info {
54 struct work_struct ondemand_work;
55 int ondemand_id;
56 enum cachefiles_object_state state;
57 struct cachefiles_object *object;
58};
59
60/*
61 * Backing file state.
62 */
63struct cachefiles_object {
64 struct fscache_cookie *cookie; /* Netfs data storage object cookie */
65 struct cachefiles_volume *volume; /* Cache volume that holds this object */
66 struct list_head cache_link; /* Link in cache->*_list */
67 struct file *file; /* The file representing this object */
68 char *d_name; /* Backing file name */
69 int debug_id;
70 spinlock_t lock;
71 refcount_t ref;
72 u8 d_name_len; /* Length of filename */
73 enum cachefiles_content content_info:8; /* Info about content presence */
74 unsigned long flags;
75#define CACHEFILES_OBJECT_USING_TMPFILE 0 /* Have an unlinked tmpfile */
76#ifdef CONFIG_CACHEFILES_ONDEMAND
77 struct cachefiles_ondemand_info *ondemand;
78#endif
79};
80
81#define CACHEFILES_ONDEMAND_ID_CLOSED -1
82
83/*
84 * Cache files cache definition
85 */
86struct cachefiles_cache {
87 struct fscache_cache *cache; /* Cache cookie */
88 struct vfsmount *mnt; /* mountpoint holding the cache */
89 struct dentry *store; /* Directory into which live objects go */
90 struct dentry *graveyard; /* directory into which dead objects go */
91 struct file *cachefilesd; /* manager daemon handle */
92 struct list_head volumes; /* List of volume objects */
93 struct list_head object_list; /* List of active objects */
94 spinlock_t object_list_lock; /* Lock for volumes and object_list */
95 const struct cred *cache_cred; /* security override for accessing cache */
96 struct mutex daemon_mutex; /* command serialisation mutex */
97 wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
98 atomic_t gravecounter; /* graveyard uniquifier */
99 atomic_t f_released; /* number of objects released lately */
100 atomic_long_t b_released; /* number of blocks released lately */
101 atomic_long_t b_writing; /* Number of blocks being written */
102 unsigned frun_percent; /* when to stop culling (% files) */
103 unsigned fcull_percent; /* when to start culling (% files) */
104 unsigned fstop_percent; /* when to stop allocating (% files) */
105 unsigned brun_percent; /* when to stop culling (% blocks) */
106 unsigned bcull_percent; /* when to start culling (% blocks) */
107 unsigned bstop_percent; /* when to stop allocating (% blocks) */
108 unsigned bsize; /* cache's block size */
109 unsigned bshift; /* ilog2(bsize) */
110 uint64_t frun; /* when to stop culling */
111 uint64_t fcull; /* when to start culling */
112 uint64_t fstop; /* when to stop allocating */
113 sector_t brun; /* when to stop culling */
114 sector_t bcull; /* when to start culling */
115 sector_t bstop; /* when to stop allocating */
116 unsigned long flags;
117#define CACHEFILES_READY 0 /* T if cache prepared */
118#define CACHEFILES_DEAD 1 /* T if cache dead */
119#define CACHEFILES_CULLING 2 /* T if cull engaged */
120#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
121#define CACHEFILES_ONDEMAND_MODE 4 /* T if in on-demand read mode */
122 char *rootdirname; /* name of cache root directory */
123 char *secctx; /* LSM security context */
124 char *tag; /* cache binding tag */
125 refcount_t unbind_pincount;/* refcount to do daemon unbind */
126 struct xarray reqs; /* xarray of pending on-demand requests */
127 unsigned long req_id_next;
128 struct xarray ondemand_ids; /* xarray for ondemand_id allocation */
129 u32 ondemand_id_next;
130};
131
132static inline bool cachefiles_in_ondemand_mode(struct cachefiles_cache *cache)
133{
134 return IS_ENABLED(CONFIG_CACHEFILES_ONDEMAND) &&
135 test_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags);
136}
137
138struct cachefiles_req {
139 struct cachefiles_object *object;
140 struct completion done;
141 int error;
142 struct cachefiles_msg msg;
143};
144
145#define CACHEFILES_REQ_NEW XA_MARK_1
146
147#include <trace/events/cachefiles.h>
148
149static inline
150struct file *cachefiles_cres_file(struct netfs_cache_resources *cres)
151{
152 return cres->cache_priv2;
153}
154
155static inline
156struct cachefiles_object *cachefiles_cres_object(struct netfs_cache_resources *cres)
157{
158 return fscache_cres_cookie(cres)->cache_priv;
159}
160
161/*
162 * note change of state for daemon
163 */
164static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
165{
166 set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
167 wake_up_all(&cache->daemon_pollwq);
168}
169
170/*
171 * cache.c
172 */
173extern int cachefiles_add_cache(struct cachefiles_cache *cache);
174extern void cachefiles_withdraw_cache(struct cachefiles_cache *cache);
175
176enum cachefiles_has_space_for {
177 cachefiles_has_space_check,
178 cachefiles_has_space_for_write,
179 cachefiles_has_space_for_create,
180};
181extern int cachefiles_has_space(struct cachefiles_cache *cache,
182 unsigned fnr, unsigned bnr,
183 enum cachefiles_has_space_for reason);
184
185/*
186 * daemon.c
187 */
188extern const struct file_operations cachefiles_daemon_fops;
189extern void cachefiles_get_unbind_pincount(struct cachefiles_cache *cache);
190extern void cachefiles_put_unbind_pincount(struct cachefiles_cache *cache);
191
192/*
193 * error_inject.c
194 */
195#ifdef CONFIG_CACHEFILES_ERROR_INJECTION
196extern unsigned int cachefiles_error_injection_state;
197extern int cachefiles_register_error_injection(void);
198extern void cachefiles_unregister_error_injection(void);
199
200#else
201#define cachefiles_error_injection_state 0
202
203static inline int cachefiles_register_error_injection(void)
204{
205 return 0;
206}
207
208static inline void cachefiles_unregister_error_injection(void)
209{
210}
211#endif
212
213
214static inline int cachefiles_inject_read_error(void)
215{
216 return cachefiles_error_injection_state & 2 ? -EIO : 0;
217}
218
219static inline int cachefiles_inject_write_error(void)
220{
221 return cachefiles_error_injection_state & 2 ? -EIO :
222 cachefiles_error_injection_state & 1 ? -ENOSPC :
223 0;
224}
225
226static inline int cachefiles_inject_remove_error(void)
227{
228 return cachefiles_error_injection_state & 2 ? -EIO : 0;
229}
230
231/*
232 * interface.c
233 */
234extern const struct fscache_cache_ops cachefiles_cache_ops;
235extern void cachefiles_see_object(struct cachefiles_object *object,
236 enum cachefiles_obj_ref_trace why);
237extern struct cachefiles_object *cachefiles_grab_object(struct cachefiles_object *object,
238 enum cachefiles_obj_ref_trace why);
239extern void cachefiles_put_object(struct cachefiles_object *object,
240 enum cachefiles_obj_ref_trace why);
241
242/*
243 * io.c
244 */
245extern bool cachefiles_begin_operation(struct netfs_cache_resources *cres,
246 enum fscache_want_state want_state);
247extern int __cachefiles_prepare_write(struct cachefiles_object *object,
248 struct file *file,
249 loff_t *_start, size_t *_len, size_t upper_len,
250 bool no_space_allocated_yet);
251extern int __cachefiles_write(struct cachefiles_object *object,
252 struct file *file,
253 loff_t start_pos,
254 struct iov_iter *iter,
255 netfs_io_terminated_t term_func,
256 void *term_func_priv);
257
258/*
259 * key.c
260 */
261extern bool cachefiles_cook_key(struct cachefiles_object *object);
262
263/*
264 * main.c
265 */
266extern struct kmem_cache *cachefiles_object_jar;
267
268/*
269 * namei.c
270 */
271extern void cachefiles_unmark_inode_in_use(struct cachefiles_object *object,
272 struct file *file);
273extern int cachefiles_bury_object(struct cachefiles_cache *cache,
274 struct cachefiles_object *object,
275 struct dentry *dir,
276 struct dentry *rep,
277 enum fscache_why_object_killed why);
278extern int cachefiles_delete_object(struct cachefiles_object *object,
279 enum fscache_why_object_killed why);
280extern bool cachefiles_look_up_object(struct cachefiles_object *object);
281extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
282 struct dentry *dir,
283 const char *name,
284 bool *_is_new);
285extern void cachefiles_put_directory(struct dentry *dir);
286
287extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
288 char *filename);
289
290extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
291 struct dentry *dir, char *filename);
292extern struct file *cachefiles_create_tmpfile(struct cachefiles_object *object);
293extern bool cachefiles_commit_tmpfile(struct cachefiles_cache *cache,
294 struct cachefiles_object *object);
295
296/*
297 * ondemand.c
298 */
299#ifdef CONFIG_CACHEFILES_ONDEMAND
300extern ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
301 char __user *_buffer, size_t buflen);
302
303extern int cachefiles_ondemand_copen(struct cachefiles_cache *cache,
304 char *args);
305
306extern int cachefiles_ondemand_restore(struct cachefiles_cache *cache,
307 char *args);
308
309extern int cachefiles_ondemand_init_object(struct cachefiles_object *object);
310extern void cachefiles_ondemand_clean_object(struct cachefiles_object *object);
311
312extern int cachefiles_ondemand_read(struct cachefiles_object *object,
313 loff_t pos, size_t len);
314
315extern int cachefiles_ondemand_init_obj_info(struct cachefiles_object *obj,
316 struct cachefiles_volume *volume);
317extern void cachefiles_ondemand_deinit_obj_info(struct cachefiles_object *obj);
318
319#define CACHEFILES_OBJECT_STATE_FUNCS(_state, _STATE) \
320static inline bool \
321cachefiles_ondemand_object_is_##_state(const struct cachefiles_object *object) \
322{ \
323 return object->ondemand->state == CACHEFILES_ONDEMAND_OBJSTATE_##_STATE; \
324} \
325 \
326static inline void \
327cachefiles_ondemand_set_object_##_state(struct cachefiles_object *object) \
328{ \
329 object->ondemand->state = CACHEFILES_ONDEMAND_OBJSTATE_##_STATE; \
330}
331
332CACHEFILES_OBJECT_STATE_FUNCS(open, OPEN);
333CACHEFILES_OBJECT_STATE_FUNCS(close, CLOSE);
334CACHEFILES_OBJECT_STATE_FUNCS(reopening, REOPENING);
335
336static inline bool cachefiles_ondemand_is_reopening_read(struct cachefiles_req *req)
337{
338 return cachefiles_ondemand_object_is_reopening(req->object) &&
339 req->msg.opcode == CACHEFILES_OP_READ;
340}
341
342#else
343static inline ssize_t cachefiles_ondemand_daemon_read(struct cachefiles_cache *cache,
344 char __user *_buffer, size_t buflen)
345{
346 return -EOPNOTSUPP;
347}
348
349static inline int cachefiles_ondemand_init_object(struct cachefiles_object *object)
350{
351 return 0;
352}
353
354static inline void cachefiles_ondemand_clean_object(struct cachefiles_object *object)
355{
356}
357
358static inline int cachefiles_ondemand_read(struct cachefiles_object *object,
359 loff_t pos, size_t len)
360{
361 return -EOPNOTSUPP;
362}
363
364static inline int cachefiles_ondemand_init_obj_info(struct cachefiles_object *obj,
365 struct cachefiles_volume *volume)
366{
367 return 0;
368}
369static inline void cachefiles_ondemand_deinit_obj_info(struct cachefiles_object *obj)
370{
371}
372
373static inline bool cachefiles_ondemand_is_reopening_read(struct cachefiles_req *req)
374{
375 return false;
376}
377#endif
378
379/*
380 * security.c
381 */
382extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
383extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
384 struct dentry *root,
385 const struct cred **_saved_cred);
386
387static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
388 const struct cred **_saved_cred)
389{
390 *_saved_cred = override_creds(cache->cache_cred);
391}
392
393static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
394 const struct cred *saved_cred)
395{
396 revert_creds(saved_cred);
397}
398
399/*
400 * volume.c
401 */
402void cachefiles_acquire_volume(struct fscache_volume *volume);
403void cachefiles_free_volume(struct fscache_volume *volume);
404void cachefiles_withdraw_volume(struct cachefiles_volume *volume);
405
406/*
407 * xattr.c
408 */
409extern int cachefiles_set_object_xattr(struct cachefiles_object *object);
410extern int cachefiles_check_auxdata(struct cachefiles_object *object,
411 struct file *file);
412extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
413 struct cachefiles_object *object,
414 struct dentry *dentry);
415extern void cachefiles_prepare_to_write(struct fscache_cookie *cookie);
416extern bool cachefiles_set_volume_xattr(struct cachefiles_volume *volume);
417extern int cachefiles_check_volume_xattr(struct cachefiles_volume *volume);
418
419/*
420 * Error handling
421 */
422#define cachefiles_io_error(___cache, FMT, ...) \
423do { \
424 pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
425 fscache_io_error((___cache)->cache); \
426 set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
427} while (0)
428
429#define cachefiles_io_error_obj(object, FMT, ...) \
430do { \
431 struct cachefiles_cache *___cache; \
432 \
433 ___cache = (object)->volume->cache; \
434 cachefiles_io_error(___cache, FMT " [o=%08x]", ##__VA_ARGS__, \
435 (object)->debug_id); \
436} while (0)
437
438
439/*
440 * Debug tracing
441 */
442extern unsigned cachefiles_debug;
443#define CACHEFILES_DEBUG_KENTER 1
444#define CACHEFILES_DEBUG_KLEAVE 2
445#define CACHEFILES_DEBUG_KDEBUG 4
446
447#define dbgprintk(FMT, ...) \
448 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
449
450#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
451#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
452#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
453
454
455#if defined(__KDEBUG)
456#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
457#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
458#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
459
460#elif defined(CONFIG_CACHEFILES_DEBUG)
461#define _enter(FMT, ...) \
462do { \
463 if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
464 kenter(FMT, ##__VA_ARGS__); \
465} while (0)
466
467#define _leave(FMT, ...) \
468do { \
469 if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
470 kleave(FMT, ##__VA_ARGS__); \
471} while (0)
472
473#define _debug(FMT, ...) \
474do { \
475 if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
476 kdebug(FMT, ##__VA_ARGS__); \
477} while (0)
478
479#else
480#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
481#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
482#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
483#endif
484
485#if 1 /* defined(__KDEBUGALL) */
486
487#define ASSERT(X) \
488do { \
489 if (unlikely(!(X))) { \
490 pr_err("\n"); \
491 pr_err("Assertion failed\n"); \
492 BUG(); \
493 } \
494} while (0)
495
496#define ASSERTCMP(X, OP, Y) \
497do { \
498 if (unlikely(!((X) OP (Y)))) { \
499 pr_err("\n"); \
500 pr_err("Assertion failed\n"); \
501 pr_err("%lx " #OP " %lx is false\n", \
502 (unsigned long)(X), (unsigned long)(Y)); \
503 BUG(); \
504 } \
505} while (0)
506
507#define ASSERTIF(C, X) \
508do { \
509 if (unlikely((C) && !(X))) { \
510 pr_err("\n"); \
511 pr_err("Assertion failed\n"); \
512 BUG(); \
513 } \
514} while (0)
515
516#define ASSERTIFCMP(C, X, OP, Y) \
517do { \
518 if (unlikely((C) && !((X) OP (Y)))) { \
519 pr_err("\n"); \
520 pr_err("Assertion failed\n"); \
521 pr_err("%lx " #OP " %lx is false\n", \
522 (unsigned long)(X), (unsigned long)(Y)); \
523 BUG(); \
524 } \
525} while (0)
526
527#else
528
529#define ASSERT(X) do {} while (0)
530#define ASSERTCMP(X, OP, Y) do {} while (0)
531#define ASSERTIF(C, X) do {} while (0)
532#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
533
534#endif
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
12#ifdef pr_fmt
13#undef pr_fmt
14#endif
15
16#define pr_fmt(fmt) "CacheFiles: " fmt
17
18
19#include <linux/fscache-cache.h>
20#include <linux/timer.h>
21#include <linux/wait_bit.h>
22#include <linux/cred.h>
23#include <linux/workqueue.h>
24#include <linux/security.h>
25
26struct cachefiles_cache;
27struct cachefiles_object;
28
29extern unsigned cachefiles_debug;
30#define CACHEFILES_DEBUG_KENTER 1
31#define CACHEFILES_DEBUG_KLEAVE 2
32#define CACHEFILES_DEBUG_KDEBUG 4
33
34#define cachefiles_gfp (__GFP_RECLAIM | __GFP_NORETRY | __GFP_NOMEMALLOC)
35
36/*
37 * node records
38 */
39struct cachefiles_object {
40 struct fscache_object fscache; /* fscache handle */
41 struct cachefiles_lookup_data *lookup_data; /* cached lookup data */
42 struct dentry *dentry; /* the file/dir representing this object */
43 struct dentry *backer; /* backing file */
44 loff_t i_size; /* object size */
45 unsigned long flags;
46#define CACHEFILES_OBJECT_ACTIVE 0 /* T if marked active */
47 atomic_t usage; /* object usage count */
48 uint8_t type; /* object type */
49 uint8_t new; /* T if object new */
50 spinlock_t work_lock;
51 struct rb_node active_node; /* link in active tree (dentry is key) */
52};
53
54extern struct kmem_cache *cachefiles_object_jar;
55
56/*
57 * Cache files cache definition
58 */
59struct cachefiles_cache {
60 struct fscache_cache cache; /* FS-Cache record */
61 struct vfsmount *mnt; /* mountpoint holding the cache */
62 struct dentry *graveyard; /* directory into which dead objects go */
63 struct file *cachefilesd; /* manager daemon handle */
64 const struct cred *cache_cred; /* security override for accessing cache */
65 struct mutex daemon_mutex; /* command serialisation mutex */
66 wait_queue_head_t daemon_pollwq; /* poll waitqueue for daemon */
67 struct rb_root active_nodes; /* active nodes (can't be culled) */
68 rwlock_t active_lock; /* lock for active_nodes */
69 atomic_t gravecounter; /* graveyard uniquifier */
70 atomic_t f_released; /* number of objects released lately */
71 atomic_long_t b_released; /* number of blocks released lately */
72 unsigned frun_percent; /* when to stop culling (% files) */
73 unsigned fcull_percent; /* when to start culling (% files) */
74 unsigned fstop_percent; /* when to stop allocating (% files) */
75 unsigned brun_percent; /* when to stop culling (% blocks) */
76 unsigned bcull_percent; /* when to start culling (% blocks) */
77 unsigned bstop_percent; /* when to stop allocating (% blocks) */
78 unsigned bsize; /* cache's block size */
79 unsigned bshift; /* min(ilog2(PAGE_SIZE / bsize), 0) */
80 uint64_t frun; /* when to stop culling */
81 uint64_t fcull; /* when to start culling */
82 uint64_t fstop; /* when to stop allocating */
83 sector_t brun; /* when to stop culling */
84 sector_t bcull; /* when to start culling */
85 sector_t bstop; /* when to stop allocating */
86 unsigned long flags;
87#define CACHEFILES_READY 0 /* T if cache prepared */
88#define CACHEFILES_DEAD 1 /* T if cache dead */
89#define CACHEFILES_CULLING 2 /* T if cull engaged */
90#define CACHEFILES_STATE_CHANGED 3 /* T if state changed (poll trigger) */
91 char *rootdirname; /* name of cache root directory */
92 char *secctx; /* LSM security context */
93 char *tag; /* cache binding tag */
94};
95
96/*
97 * backing file read tracking
98 */
99struct cachefiles_one_read {
100 wait_queue_entry_t monitor; /* link into monitored waitqueue */
101 struct page *back_page; /* backing file page we're waiting for */
102 struct page *netfs_page; /* netfs page we're going to fill */
103 struct fscache_retrieval *op; /* retrieval op covering this */
104 struct list_head op_link; /* link in op's todo list */
105};
106
107/*
108 * backing file write tracking
109 */
110struct cachefiles_one_write {
111 struct page *netfs_page; /* netfs page to copy */
112 struct cachefiles_object *object;
113 struct list_head obj_link; /* link in object's lists */
114 fscache_rw_complete_t end_io_func;
115 void *context;
116};
117
118/*
119 * auxiliary data xattr buffer
120 */
121struct cachefiles_xattr {
122 uint16_t len;
123 uint8_t type;
124 uint8_t data[];
125};
126
127#include <trace/events/cachefiles.h>
128
129/*
130 * note change of state for daemon
131 */
132static inline void cachefiles_state_changed(struct cachefiles_cache *cache)
133{
134 set_bit(CACHEFILES_STATE_CHANGED, &cache->flags);
135 wake_up_all(&cache->daemon_pollwq);
136}
137
138/*
139 * bind.c
140 */
141extern int cachefiles_daemon_bind(struct cachefiles_cache *cache, char *args);
142extern void cachefiles_daemon_unbind(struct cachefiles_cache *cache);
143
144/*
145 * daemon.c
146 */
147extern const struct file_operations cachefiles_daemon_fops;
148
149extern int cachefiles_has_space(struct cachefiles_cache *cache,
150 unsigned fnr, unsigned bnr);
151
152/*
153 * interface.c
154 */
155extern const struct fscache_cache_ops cachefiles_cache_ops;
156
157/*
158 * key.c
159 */
160extern char *cachefiles_cook_key(const u8 *raw, int keylen, uint8_t type);
161
162/*
163 * namei.c
164 */
165extern void cachefiles_mark_object_inactive(struct cachefiles_cache *cache,
166 struct cachefiles_object *object,
167 blkcnt_t i_blocks);
168extern int cachefiles_delete_object(struct cachefiles_cache *cache,
169 struct cachefiles_object *object);
170extern int cachefiles_walk_to_object(struct cachefiles_object *parent,
171 struct cachefiles_object *object,
172 const char *key,
173 struct cachefiles_xattr *auxdata);
174extern struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
175 struct dentry *dir,
176 const char *name);
177
178extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
179 char *filename);
180
181extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
182 struct dentry *dir, char *filename);
183
184/*
185 * proc.c
186 */
187#ifdef CONFIG_CACHEFILES_HISTOGRAM
188extern atomic_t cachefiles_lookup_histogram[HZ];
189extern atomic_t cachefiles_mkdir_histogram[HZ];
190extern atomic_t cachefiles_create_histogram[HZ];
191
192extern int __init cachefiles_proc_init(void);
193extern void cachefiles_proc_cleanup(void);
194static inline
195void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
196{
197 unsigned long jif = jiffies - start_jif;
198 if (jif >= HZ)
199 jif = HZ - 1;
200 atomic_inc(&histogram[jif]);
201}
202
203#else
204#define cachefiles_proc_init() (0)
205#define cachefiles_proc_cleanup() do {} while (0)
206#define cachefiles_hist(hist, start_jif) do {} while (0)
207#endif
208
209/*
210 * rdwr.c
211 */
212extern int cachefiles_read_or_alloc_page(struct fscache_retrieval *,
213 struct page *, gfp_t);
214extern int cachefiles_read_or_alloc_pages(struct fscache_retrieval *,
215 struct list_head *, unsigned *,
216 gfp_t);
217extern int cachefiles_allocate_page(struct fscache_retrieval *, struct page *,
218 gfp_t);
219extern int cachefiles_allocate_pages(struct fscache_retrieval *,
220 struct list_head *, unsigned *, gfp_t);
221extern int cachefiles_write_page(struct fscache_storage *, struct page *);
222extern void cachefiles_uncache_page(struct fscache_object *, struct page *);
223
224/*
225 * security.c
226 */
227extern int cachefiles_get_security_ID(struct cachefiles_cache *cache);
228extern int cachefiles_determine_cache_security(struct cachefiles_cache *cache,
229 struct dentry *root,
230 const struct cred **_saved_cred);
231
232static inline void cachefiles_begin_secure(struct cachefiles_cache *cache,
233 const struct cred **_saved_cred)
234{
235 *_saved_cred = override_creds(cache->cache_cred);
236}
237
238static inline void cachefiles_end_secure(struct cachefiles_cache *cache,
239 const struct cred *saved_cred)
240{
241 revert_creds(saved_cred);
242}
243
244/*
245 * xattr.c
246 */
247extern int cachefiles_check_object_type(struct cachefiles_object *object);
248extern int cachefiles_set_object_xattr(struct cachefiles_object *object,
249 struct cachefiles_xattr *auxdata);
250extern int cachefiles_update_object_xattr(struct cachefiles_object *object,
251 struct cachefiles_xattr *auxdata);
252extern int cachefiles_check_auxdata(struct cachefiles_object *object);
253extern int cachefiles_check_object_xattr(struct cachefiles_object *object,
254 struct cachefiles_xattr *auxdata);
255extern int cachefiles_remove_object_xattr(struct cachefiles_cache *cache,
256 struct dentry *dentry);
257
258
259/*
260 * error handling
261 */
262
263#define cachefiles_io_error(___cache, FMT, ...) \
264do { \
265 pr_err("I/O Error: " FMT"\n", ##__VA_ARGS__); \
266 fscache_io_error(&(___cache)->cache); \
267 set_bit(CACHEFILES_DEAD, &(___cache)->flags); \
268} while (0)
269
270#define cachefiles_io_error_obj(object, FMT, ...) \
271do { \
272 struct cachefiles_cache *___cache; \
273 \
274 ___cache = container_of((object)->fscache.cache, \
275 struct cachefiles_cache, cache); \
276 cachefiles_io_error(___cache, FMT, ##__VA_ARGS__); \
277} while (0)
278
279
280/*
281 * debug tracing
282 */
283#define dbgprintk(FMT, ...) \
284 printk(KERN_DEBUG "[%-6.6s] "FMT"\n", current->comm, ##__VA_ARGS__)
285
286#define kenter(FMT, ...) dbgprintk("==> %s("FMT")", __func__, ##__VA_ARGS__)
287#define kleave(FMT, ...) dbgprintk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
288#define kdebug(FMT, ...) dbgprintk(FMT, ##__VA_ARGS__)
289
290
291#if defined(__KDEBUG)
292#define _enter(FMT, ...) kenter(FMT, ##__VA_ARGS__)
293#define _leave(FMT, ...) kleave(FMT, ##__VA_ARGS__)
294#define _debug(FMT, ...) kdebug(FMT, ##__VA_ARGS__)
295
296#elif defined(CONFIG_CACHEFILES_DEBUG)
297#define _enter(FMT, ...) \
298do { \
299 if (cachefiles_debug & CACHEFILES_DEBUG_KENTER) \
300 kenter(FMT, ##__VA_ARGS__); \
301} while (0)
302
303#define _leave(FMT, ...) \
304do { \
305 if (cachefiles_debug & CACHEFILES_DEBUG_KLEAVE) \
306 kleave(FMT, ##__VA_ARGS__); \
307} while (0)
308
309#define _debug(FMT, ...) \
310do { \
311 if (cachefiles_debug & CACHEFILES_DEBUG_KDEBUG) \
312 kdebug(FMT, ##__VA_ARGS__); \
313} while (0)
314
315#else
316#define _enter(FMT, ...) no_printk("==> %s("FMT")", __func__, ##__VA_ARGS__)
317#define _leave(FMT, ...) no_printk("<== %s()"FMT"", __func__, ##__VA_ARGS__)
318#define _debug(FMT, ...) no_printk(FMT, ##__VA_ARGS__)
319#endif
320
321#if 1 /* defined(__KDEBUGALL) */
322
323#define ASSERT(X) \
324do { \
325 if (unlikely(!(X))) { \
326 pr_err("\n"); \
327 pr_err("Assertion failed\n"); \
328 BUG(); \
329 } \
330} while (0)
331
332#define ASSERTCMP(X, OP, Y) \
333do { \
334 if (unlikely(!((X) OP (Y)))) { \
335 pr_err("\n"); \
336 pr_err("Assertion failed\n"); \
337 pr_err("%lx " #OP " %lx is false\n", \
338 (unsigned long)(X), (unsigned long)(Y)); \
339 BUG(); \
340 } \
341} while (0)
342
343#define ASSERTIF(C, X) \
344do { \
345 if (unlikely((C) && !(X))) { \
346 pr_err("\n"); \
347 pr_err("Assertion failed\n"); \
348 BUG(); \
349 } \
350} while (0)
351
352#define ASSERTIFCMP(C, X, OP, Y) \
353do { \
354 if (unlikely((C) && !((X) OP (Y)))) { \
355 pr_err("\n"); \
356 pr_err("Assertion failed\n"); \
357 pr_err("%lx " #OP " %lx is false\n", \
358 (unsigned long)(X), (unsigned long)(Y)); \
359 BUG(); \
360 } \
361} while (0)
362
363#else
364
365#define ASSERT(X) do {} while (0)
366#define ASSERTCMP(X, OP, Y) do {} while (0)
367#define ASSERTIF(C, X) do {} while (0)
368#define ASSERTIFCMP(C, X, OP, Y) do {} while (0)
369
370#endif