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Linux/include/linux/fscache-cache.h

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  1 /* General filesystem caching backing cache interface
  2  *
  3  * Copyright (C) 2004-2007 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 License
  8  * as published by the Free Software Foundation; either version
  9  * 2 of the License, or (at your option) any later version.
 10  *
 11  * NOTE!!! See:
 12  *
 13  *      Documentation/filesystems/caching/backend-api.txt
 14  *
 15  * for a description of the cache backend interface declared here.
 16  */
 17 
 18 #ifndef _LINUX_FSCACHE_CACHE_H
 19 #define _LINUX_FSCACHE_CACHE_H
 20 
 21 #include <linux/fscache.h>
 22 #include <linux/sched.h>
 23 #include <linux/workqueue.h>
 24 
 25 #define NR_MAXCACHES BITS_PER_LONG
 26 
 27 struct fscache_cache;
 28 struct fscache_cache_ops;
 29 struct fscache_object;
 30 struct fscache_operation;
 31 
 32 enum fscache_obj_ref_trace {
 33         fscache_obj_get_add_to_deps,
 34         fscache_obj_get_queue,
 35         fscache_obj_put_alloc_fail,
 36         fscache_obj_put_attach_fail,
 37         fscache_obj_put_drop_obj,
 38         fscache_obj_put_enq_dep,
 39         fscache_obj_put_queue,
 40         fscache_obj_put_work,
 41         fscache_obj_ref__nr_traces
 42 };
 43 
 44 /*
 45  * cache tag definition
 46  */
 47 struct fscache_cache_tag {
 48         struct list_head        link;
 49         struct fscache_cache    *cache;         /* cache referred to by this tag */
 50         unsigned long           flags;
 51 #define FSCACHE_TAG_RESERVED    0               /* T if tag is reserved for a cache */
 52         atomic_t                usage;
 53         char                    name[0];        /* tag name */
 54 };
 55 
 56 /*
 57  * cache definition
 58  */
 59 struct fscache_cache {
 60         const struct fscache_cache_ops *ops;
 61         struct fscache_cache_tag *tag;          /* tag representing this cache */
 62         struct kobject          *kobj;          /* system representation of this cache */
 63         struct list_head        link;           /* link in list of caches */
 64         size_t                  max_index_size; /* maximum size of index data */
 65         char                    identifier[36]; /* cache label */
 66 
 67         /* node management */
 68         struct work_struct      op_gc;          /* operation garbage collector */
 69         struct list_head        object_list;    /* list of data/index objects */
 70         struct list_head        op_gc_list;     /* list of ops to be deleted */
 71         spinlock_t              object_list_lock;
 72         spinlock_t              op_gc_list_lock;
 73         atomic_t                object_count;   /* no. of live objects in this cache */
 74         struct fscache_object   *fsdef;         /* object for the fsdef index */
 75         unsigned long           flags;
 76 #define FSCACHE_IOERROR         0       /* cache stopped on I/O error */
 77 #define FSCACHE_CACHE_WITHDRAWN 1       /* cache has been withdrawn */
 78 };
 79 
 80 extern wait_queue_head_t fscache_cache_cleared_wq;
 81 
 82 /*
 83  * operation to be applied to a cache object
 84  * - retrieval initiation operations are done in the context of the process
 85  *   that issued them, and not in an async thread pool
 86  */
 87 typedef void (*fscache_operation_release_t)(struct fscache_operation *op);
 88 typedef void (*fscache_operation_processor_t)(struct fscache_operation *op);
 89 typedef void (*fscache_operation_cancel_t)(struct fscache_operation *op);
 90 
 91 enum fscache_operation_state {
 92         FSCACHE_OP_ST_BLANK,            /* Op is not yet submitted */
 93         FSCACHE_OP_ST_INITIALISED,      /* Op is initialised */
 94         FSCACHE_OP_ST_PENDING,          /* Op is blocked from running */
 95         FSCACHE_OP_ST_IN_PROGRESS,      /* Op is in progress */
 96         FSCACHE_OP_ST_COMPLETE,         /* Op is complete */
 97         FSCACHE_OP_ST_CANCELLED,        /* Op has been cancelled */
 98         FSCACHE_OP_ST_DEAD              /* Op is now dead */
 99 };
100 
101 struct fscache_operation {
102         struct work_struct      work;           /* record for async ops */
103         struct list_head        pend_link;      /* link in object->pending_ops */
104         struct fscache_object   *object;        /* object to be operated upon */
105 
106         unsigned long           flags;
107 #define FSCACHE_OP_TYPE         0x000f  /* operation type */
108 #define FSCACHE_OP_ASYNC        0x0001  /* - async op, processor may sleep for disk */
109 #define FSCACHE_OP_MYTHREAD     0x0002  /* - processing is done be issuing thread, not pool */
110 #define FSCACHE_OP_WAITING      4       /* cleared when op is woken */
111 #define FSCACHE_OP_EXCLUSIVE    5       /* exclusive op, other ops must wait */
112 #define FSCACHE_OP_DEC_READ_CNT 6       /* decrement object->n_reads on destruction */
113 #define FSCACHE_OP_UNUSE_COOKIE 7       /* call fscache_unuse_cookie() on completion */
114 #define FSCACHE_OP_KEEP_FLAGS   0x00f0  /* flags to keep when repurposing an op */
115 
116         enum fscache_operation_state state;
117         atomic_t                usage;
118         unsigned                debug_id;       /* debugging ID */
119 
120         /* operation processor callback
121          * - can be NULL if FSCACHE_OP_WAITING is going to be used to perform
122          *   the op in a non-pool thread */
123         fscache_operation_processor_t processor;
124 
125         /* Operation cancellation cleanup (optional) */
126         fscache_operation_cancel_t cancel;
127 
128         /* operation releaser */
129         fscache_operation_release_t release;
130 };
131 
132 extern atomic_t fscache_op_debug_id;
133 extern void fscache_op_work_func(struct work_struct *work);
134 
135 extern void fscache_enqueue_operation(struct fscache_operation *);
136 extern void fscache_op_complete(struct fscache_operation *, bool);
137 extern void fscache_put_operation(struct fscache_operation *);
138 extern void fscache_operation_init(struct fscache_cookie *,
139                                    struct fscache_operation *,
140                                    fscache_operation_processor_t,
141                                    fscache_operation_cancel_t,
142                                    fscache_operation_release_t);
143 
144 /*
145  * data read operation
146  */
147 struct fscache_retrieval {
148         struct fscache_operation op;
149         struct fscache_cookie   *cookie;        /* The netfs cookie */
150         struct address_space    *mapping;       /* netfs pages */
151         fscache_rw_complete_t   end_io_func;    /* function to call on I/O completion */
152         void                    *context;       /* netfs read context (pinned) */
153         struct list_head        to_do;          /* list of things to be done by the backend */
154         unsigned long           start_time;     /* time at which retrieval started */
155         atomic_t                n_pages;        /* number of pages to be retrieved */
156 };
157 
158 typedef int (*fscache_page_retrieval_func_t)(struct fscache_retrieval *op,
159                                              struct page *page,
160                                              gfp_t gfp);
161 
162 typedef int (*fscache_pages_retrieval_func_t)(struct fscache_retrieval *op,
163                                               struct list_head *pages,
164                                               unsigned *nr_pages,
165                                               gfp_t gfp);
166 
167 /**
168  * fscache_get_retrieval - Get an extra reference on a retrieval operation
169  * @op: The retrieval operation to get a reference on
170  *
171  * Get an extra reference on a retrieval operation.
172  */
173 static inline
174 struct fscache_retrieval *fscache_get_retrieval(struct fscache_retrieval *op)
175 {
176         atomic_inc(&op->op.usage);
177         return op;
178 }
179 
180 /**
181  * fscache_enqueue_retrieval - Enqueue a retrieval operation for processing
182  * @op: The retrieval operation affected
183  *
184  * Enqueue a retrieval operation for processing by the FS-Cache thread pool.
185  */
186 static inline void fscache_enqueue_retrieval(struct fscache_retrieval *op)
187 {
188         fscache_enqueue_operation(&op->op);
189 }
190 
191 /**
192  * fscache_retrieval_complete - Record (partial) completion of a retrieval
193  * @op: The retrieval operation affected
194  * @n_pages: The number of pages to account for
195  */
196 static inline void fscache_retrieval_complete(struct fscache_retrieval *op,
197                                               int n_pages)
198 {
199         if (atomic_sub_return_relaxed(n_pages, &op->n_pages) <= 0)
200                 fscache_op_complete(&op->op, false);
201 }
202 
203 /**
204  * fscache_put_retrieval - Drop a reference to a retrieval operation
205  * @op: The retrieval operation affected
206  *
207  * Drop a reference to a retrieval operation.
208  */
209 static inline void fscache_put_retrieval(struct fscache_retrieval *op)
210 {
211         fscache_put_operation(&op->op);
212 }
213 
214 /*
215  * cached page storage work item
216  * - used to do three things:
217  *   - batch writes to the cache
218  *   - do cache writes asynchronously
219  *   - defer writes until cache object lookup completion
220  */
221 struct fscache_storage {
222         struct fscache_operation op;
223         pgoff_t                 store_limit;    /* don't write more than this */
224 };
225 
226 /*
227  * cache operations
228  */
229 struct fscache_cache_ops {
230         /* name of cache provider */
231         const char *name;
232 
233         /* allocate an object record for a cookie */
234         struct fscache_object *(*alloc_object)(struct fscache_cache *cache,
235                                                struct fscache_cookie *cookie);
236 
237         /* look up the object for a cookie
238          * - return -ETIMEDOUT to be requeued
239          */
240         int (*lookup_object)(struct fscache_object *object);
241 
242         /* finished looking up */
243         void (*lookup_complete)(struct fscache_object *object);
244 
245         /* increment the usage count on this object (may fail if unmounting) */
246         struct fscache_object *(*grab_object)(struct fscache_object *object,
247                                               enum fscache_obj_ref_trace why);
248 
249         /* pin an object in the cache */
250         int (*pin_object)(struct fscache_object *object);
251 
252         /* unpin an object in the cache */
253         void (*unpin_object)(struct fscache_object *object);
254 
255         /* check the consistency between the backing cache and the FS-Cache
256          * cookie */
257         int (*check_consistency)(struct fscache_operation *op);
258 
259         /* store the updated auxiliary data on an object */
260         void (*update_object)(struct fscache_object *object);
261 
262         /* Invalidate an object */
263         void (*invalidate_object)(struct fscache_operation *op);
264 
265         /* discard the resources pinned by an object and effect retirement if
266          * necessary */
267         void (*drop_object)(struct fscache_object *object);
268 
269         /* dispose of a reference to an object */
270         void (*put_object)(struct fscache_object *object,
271                            enum fscache_obj_ref_trace why);
272 
273         /* sync a cache */
274         void (*sync_cache)(struct fscache_cache *cache);
275 
276         /* notification that the attributes of a non-index object (such as
277          * i_size) have changed */
278         int (*attr_changed)(struct fscache_object *object);
279 
280         /* reserve space for an object's data and associated metadata */
281         int (*reserve_space)(struct fscache_object *object, loff_t i_size);
282 
283         /* request a backing block for a page be read or allocated in the
284          * cache */
285         fscache_page_retrieval_func_t read_or_alloc_page;
286 
287         /* request backing blocks for a list of pages be read or allocated in
288          * the cache */
289         fscache_pages_retrieval_func_t read_or_alloc_pages;
290 
291         /* request a backing block for a page be allocated in the cache so that
292          * it can be written directly */
293         fscache_page_retrieval_func_t allocate_page;
294 
295         /* request backing blocks for pages be allocated in the cache so that
296          * they can be written directly */
297         fscache_pages_retrieval_func_t allocate_pages;
298 
299         /* write a page to its backing block in the cache */
300         int (*write_page)(struct fscache_storage *op, struct page *page);
301 
302         /* detach backing block from a page (optional)
303          * - must release the cookie lock before returning
304          * - may sleep
305          */
306         void (*uncache_page)(struct fscache_object *object,
307                              struct page *page);
308 
309         /* dissociate a cache from all the pages it was backing */
310         void (*dissociate_pages)(struct fscache_cache *cache);
311 };
312 
313 extern struct fscache_cookie fscache_fsdef_index;
314 
315 /*
316  * Event list for fscache_object::{event_mask,events}
317  */
318 enum {
319         FSCACHE_OBJECT_EV_NEW_CHILD,    /* T if object has a new child */
320         FSCACHE_OBJECT_EV_PARENT_READY, /* T if object's parent is ready */
321         FSCACHE_OBJECT_EV_UPDATE,       /* T if object should be updated */
322         FSCACHE_OBJECT_EV_INVALIDATE,   /* T if cache requested object invalidation */
323         FSCACHE_OBJECT_EV_CLEARED,      /* T if accessors all gone */
324         FSCACHE_OBJECT_EV_ERROR,        /* T if fatal error occurred during processing */
325         FSCACHE_OBJECT_EV_KILL,         /* T if netfs relinquished or cache withdrew object */
326         NR_FSCACHE_OBJECT_EVENTS
327 };
328 
329 #define FSCACHE_OBJECT_EVENTS_MASK ((1UL << NR_FSCACHE_OBJECT_EVENTS) - 1)
330 
331 /*
332  * States for object state machine.
333  */
334 struct fscache_transition {
335         unsigned long events;
336         const struct fscache_state *transit_to;
337 };
338 
339 struct fscache_state {
340         char name[24];
341         char short_name[8];
342         const struct fscache_state *(*work)(struct fscache_object *object,
343                                             int event);
344         const struct fscache_transition transitions[];
345 };
346 
347 /*
348  * on-disk cache file or index handle
349  */
350 struct fscache_object {
351         const struct fscache_state *state;      /* Object state machine state */
352         const struct fscache_transition *oob_table; /* OOB state transition table */
353         int                     debug_id;       /* debugging ID */
354         int                     n_children;     /* number of child objects */
355         int                     n_ops;          /* number of extant ops on object */
356         int                     n_obj_ops;      /* number of object ops outstanding on object */
357         int                     n_in_progress;  /* number of ops in progress */
358         int                     n_exclusive;    /* number of exclusive ops queued or in progress */
359         atomic_t                n_reads;        /* number of read ops in progress */
360         spinlock_t              lock;           /* state and operations lock */
361 
362         unsigned long           lookup_jif;     /* time at which lookup started */
363         unsigned long           oob_event_mask; /* OOB events this object is interested in */
364         unsigned long           event_mask;     /* events this object is interested in */
365         unsigned long           events;         /* events to be processed by this object
366                                                  * (order is important - using fls) */
367 
368         unsigned long           flags;
369 #define FSCACHE_OBJECT_LOCK             0       /* T if object is busy being processed */
370 #define FSCACHE_OBJECT_PENDING_WRITE    1       /* T if object has pending write */
371 #define FSCACHE_OBJECT_WAITING          2       /* T if object is waiting on its parent */
372 #define FSCACHE_OBJECT_IS_LIVE          3       /* T if object is not withdrawn or relinquished */
373 #define FSCACHE_OBJECT_IS_LOOKED_UP     4       /* T if object has been looked up */
374 #define FSCACHE_OBJECT_IS_AVAILABLE     5       /* T if object has become active */
375 #define FSCACHE_OBJECT_RETIRED          6       /* T if object was retired on relinquishment */
376 #define FSCACHE_OBJECT_KILLED_BY_CACHE  7       /* T if object was killed by the cache */
377 #define FSCACHE_OBJECT_RUN_AFTER_DEAD   8       /* T if object has been dispatched after death */
378 
379         struct list_head        cache_link;     /* link in cache->object_list */
380         struct hlist_node       cookie_link;    /* link in cookie->backing_objects */
381         struct fscache_cache    *cache;         /* cache that supplied this object */
382         struct fscache_cookie   *cookie;        /* netfs's file/index object */
383         struct fscache_object   *parent;        /* parent object */
384         struct work_struct      work;           /* attention scheduling record */
385         struct list_head        dependents;     /* FIFO of dependent objects */
386         struct list_head        dep_link;       /* link in parent's dependents list */
387         struct list_head        pending_ops;    /* unstarted operations on this object */
388 #ifdef CONFIG_FSCACHE_OBJECT_LIST
389         struct rb_node          objlist_link;   /* link in global object list */
390 #endif
391         pgoff_t                 store_limit;    /* current storage limit */
392         loff_t                  store_limit_l;  /* current storage limit */
393 };
394 
395 extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *,
396                                 struct fscache_cache *);
397 extern void fscache_object_destroy(struct fscache_object *);
398 
399 extern void fscache_object_lookup_negative(struct fscache_object *object);
400 extern void fscache_obtained_object(struct fscache_object *object);
401 
402 static inline bool fscache_object_is_live(struct fscache_object *object)
403 {
404         return test_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
405 }
406 
407 static inline bool fscache_object_is_dying(struct fscache_object *object)
408 {
409         return !fscache_object_is_live(object);
410 }
411 
412 static inline bool fscache_object_is_available(struct fscache_object *object)
413 {
414         return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
415 }
416 
417 static inline bool fscache_cache_is_broken(struct fscache_object *object)
418 {
419         return test_bit(FSCACHE_IOERROR, &object->cache->flags);
420 }
421 
422 static inline bool fscache_object_is_active(struct fscache_object *object)
423 {
424         return fscache_object_is_available(object) &&
425                 fscache_object_is_live(object) &&
426                 !fscache_cache_is_broken(object);
427 }
428 
429 /**
430  * fscache_object_destroyed - Note destruction of an object in a cache
431  * @cache: The cache from which the object came
432  *
433  * Note the destruction and deallocation of an object record in a cache.
434  */
435 static inline void fscache_object_destroyed(struct fscache_cache *cache)
436 {
437         if (atomic_dec_and_test(&cache->object_count))
438                 wake_up_all(&fscache_cache_cleared_wq);
439 }
440 
441 /**
442  * fscache_object_lookup_error - Note an object encountered an error
443  * @object: The object on which the error was encountered
444  *
445  * Note that an object encountered a fatal error (usually an I/O error) and
446  * that it should be withdrawn as soon as possible.
447  */
448 static inline void fscache_object_lookup_error(struct fscache_object *object)
449 {
450         set_bit(FSCACHE_OBJECT_EV_ERROR, &object->events);
451 }
452 
453 /**
454  * fscache_set_store_limit - Set the maximum size to be stored in an object
455  * @object: The object to set the maximum on
456  * @i_size: The limit to set in bytes
457  *
458  * Set the maximum size an object is permitted to reach, implying the highest
459  * byte that may be written.  Intended to be called by the attr_changed() op.
460  *
461  * See Documentation/filesystems/caching/backend-api.txt for a complete
462  * description.
463  */
464 static inline
465 void fscache_set_store_limit(struct fscache_object *object, loff_t i_size)
466 {
467         object->store_limit_l = i_size;
468         object->store_limit = i_size >> PAGE_SHIFT;
469         if (i_size & ~PAGE_MASK)
470                 object->store_limit++;
471 }
472 
473 /**
474  * fscache_end_io - End a retrieval operation on a page
475  * @op: The FS-Cache operation covering the retrieval
476  * @page: The page that was to be fetched
477  * @error: The error code (0 if successful)
478  *
479  * Note the end of an operation to retrieve a page, as covered by a particular
480  * operation record.
481  */
482 static inline void fscache_end_io(struct fscache_retrieval *op,
483                                   struct page *page, int error)
484 {
485         op->end_io_func(page, op->context, error);
486 }
487 
488 static inline void __fscache_use_cookie(struct fscache_cookie *cookie)
489 {
490         atomic_inc(&cookie->n_active);
491 }
492 
493 /**
494  * fscache_use_cookie - Request usage of cookie attached to an object
495  * @object: Object description
496  * 
497  * Request usage of the cookie attached to an object.  NULL is returned if the
498  * relinquishment had reduced the cookie usage count to 0.
499  */
500 static inline bool fscache_use_cookie(struct fscache_object *object)
501 {
502         struct fscache_cookie *cookie = object->cookie;
503         return atomic_inc_not_zero(&cookie->n_active) != 0;
504 }
505 
506 static inline bool __fscache_unuse_cookie(struct fscache_cookie *cookie)
507 {
508         return atomic_dec_and_test(&cookie->n_active);
509 }
510 
511 static inline void __fscache_wake_unused_cookie(struct fscache_cookie *cookie)
512 {
513         wake_up_var(&cookie->n_active);
514 }
515 
516 /**
517  * fscache_unuse_cookie - Cease usage of cookie attached to an object
518  * @object: Object description
519  * 
520  * Cease usage of the cookie attached to an object.  When the users count
521  * reaches zero then the cookie relinquishment will be permitted to proceed.
522  */
523 static inline void fscache_unuse_cookie(struct fscache_object *object)
524 {
525         struct fscache_cookie *cookie = object->cookie;
526         if (__fscache_unuse_cookie(cookie))
527                 __fscache_wake_unused_cookie(cookie);
528 }
529 
530 /*
531  * out-of-line cache backend functions
532  */
533 extern __printf(3, 4)
534 void fscache_init_cache(struct fscache_cache *cache,
535                         const struct fscache_cache_ops *ops,
536                         const char *idfmt, ...);
537 
538 extern int fscache_add_cache(struct fscache_cache *cache,
539                              struct fscache_object *fsdef,
540                              const char *tagname);
541 extern void fscache_withdraw_cache(struct fscache_cache *cache);
542 
543 extern void fscache_io_error(struct fscache_cache *cache);
544 
545 extern void fscache_mark_page_cached(struct fscache_retrieval *op,
546                                      struct page *page);
547 
548 extern void fscache_mark_pages_cached(struct fscache_retrieval *op,
549                                       struct pagevec *pagevec);
550 
551 extern bool fscache_object_sleep_till_congested(signed long *timeoutp);
552 
553 extern enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
554                                                const void *data,
555                                                uint16_t datalen,
556                                                loff_t object_size);
557 
558 extern void fscache_object_retrying_stale(struct fscache_object *object);
559 
560 enum fscache_why_object_killed {
561         FSCACHE_OBJECT_IS_STALE,
562         FSCACHE_OBJECT_NO_SPACE,
563         FSCACHE_OBJECT_WAS_RETIRED,
564         FSCACHE_OBJECT_WAS_CULLED,
565 };
566 extern void fscache_object_mark_killed(struct fscache_object *object,
567                                        enum fscache_why_object_killed why);
568 
569 #endif /* _LINUX_FSCACHE_CACHE_H */
570 

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