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Linux/include/linux/fscache-cache.h

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /* General filesystem caching backing cache interface
  3  *
  4  * Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
  5  * Written by David Howells (dhowells@redhat.com)
  6  *
  7  * NOTE!!! See:
  8  *
  9  *      Documentation/filesystems/caching/backend-api.txt
 10  *
 11  * for a description of the cache backend interface declared here.
 12  */
 13 
 14 #ifndef _LINUX_FSCACHE_CACHE_H
 15 #define _LINUX_FSCACHE_CACHE_H
 16 
 17 #include <linux/fscache.h>
 18 #include <linux/sched.h>
 19 #include <linux/workqueue.h>
 20 
 21 #define NR_MAXCACHES BITS_PER_LONG
 22 
 23 struct fscache_cache;
 24 struct fscache_cache_ops;
 25 struct fscache_object;
 26 struct fscache_operation;
 27 
 28 enum fscache_obj_ref_trace {
 29         fscache_obj_get_add_to_deps,
 30         fscache_obj_get_queue,
 31         fscache_obj_put_alloc_fail,
 32         fscache_obj_put_attach_fail,
 33         fscache_obj_put_drop_obj,
 34         fscache_obj_put_enq_dep,
 35         fscache_obj_put_queue,
 36         fscache_obj_put_work,
 37         fscache_obj_ref__nr_traces
 38 };
 39 
 40 /*
 41  * cache tag definition
 42  */
 43 struct fscache_cache_tag {
 44         struct list_head        link;
 45         struct fscache_cache    *cache;         /* cache referred to by this tag */
 46         unsigned long           flags;
 47 #define FSCACHE_TAG_RESERVED    0               /* T if tag is reserved for a cache */
 48         atomic_t                usage;
 49         char                    name[0];        /* tag name */
 50 };
 51 
 52 /*
 53  * cache definition
 54  */
 55 struct fscache_cache {
 56         const struct fscache_cache_ops *ops;
 57         struct fscache_cache_tag *tag;          /* tag representing this cache */
 58         struct kobject          *kobj;          /* system representation of this cache */
 59         struct list_head        link;           /* link in list of caches */
 60         size_t                  max_index_size; /* maximum size of index data */
 61         char                    identifier[36]; /* cache label */
 62 
 63         /* node management */
 64         struct work_struct      op_gc;          /* operation garbage collector */
 65         struct list_head        object_list;    /* list of data/index objects */
 66         struct list_head        op_gc_list;     /* list of ops to be deleted */
 67         spinlock_t              object_list_lock;
 68         spinlock_t              op_gc_list_lock;
 69         atomic_t                object_count;   /* no. of live objects in this cache */
 70         struct fscache_object   *fsdef;         /* object for the fsdef index */
 71         unsigned long           flags;
 72 #define FSCACHE_IOERROR         0       /* cache stopped on I/O error */
 73 #define FSCACHE_CACHE_WITHDRAWN 1       /* cache has been withdrawn */
 74 };
 75 
 76 extern wait_queue_head_t fscache_cache_cleared_wq;
 77 
 78 /*
 79  * operation to be applied to a cache object
 80  * - retrieval initiation operations are done in the context of the process
 81  *   that issued them, and not in an async thread pool
 82  */
 83 typedef void (*fscache_operation_release_t)(struct fscache_operation *op);
 84 typedef void (*fscache_operation_processor_t)(struct fscache_operation *op);
 85 typedef void (*fscache_operation_cancel_t)(struct fscache_operation *op);
 86 
 87 enum fscache_operation_state {
 88         FSCACHE_OP_ST_BLANK,            /* Op is not yet submitted */
 89         FSCACHE_OP_ST_INITIALISED,      /* Op is initialised */
 90         FSCACHE_OP_ST_PENDING,          /* Op is blocked from running */
 91         FSCACHE_OP_ST_IN_PROGRESS,      /* Op is in progress */
 92         FSCACHE_OP_ST_COMPLETE,         /* Op is complete */
 93         FSCACHE_OP_ST_CANCELLED,        /* Op has been cancelled */
 94         FSCACHE_OP_ST_DEAD              /* Op is now dead */
 95 };
 96 
 97 struct fscache_operation {
 98         struct work_struct      work;           /* record for async ops */
 99         struct list_head        pend_link;      /* link in object->pending_ops */
100         struct fscache_object   *object;        /* object to be operated upon */
101 
102         unsigned long           flags;
103 #define FSCACHE_OP_TYPE         0x000f  /* operation type */
104 #define FSCACHE_OP_ASYNC        0x0001  /* - async op, processor may sleep for disk */
105 #define FSCACHE_OP_MYTHREAD     0x0002  /* - processing is done be issuing thread, not pool */
106 #define FSCACHE_OP_WAITING      4       /* cleared when op is woken */
107 #define FSCACHE_OP_EXCLUSIVE    5       /* exclusive op, other ops must wait */
108 #define FSCACHE_OP_DEC_READ_CNT 6       /* decrement object->n_reads on destruction */
109 #define FSCACHE_OP_UNUSE_COOKIE 7       /* call fscache_unuse_cookie() on completion */
110 #define FSCACHE_OP_KEEP_FLAGS   0x00f0  /* flags to keep when repurposing an op */
111 
112         enum fscache_operation_state state;
113         atomic_t                usage;
114         unsigned                debug_id;       /* debugging ID */
115 
116         /* operation processor callback
117          * - can be NULL if FSCACHE_OP_WAITING is going to be used to perform
118          *   the op in a non-pool thread */
119         fscache_operation_processor_t processor;
120 
121         /* Operation cancellation cleanup (optional) */
122         fscache_operation_cancel_t cancel;
123 
124         /* operation releaser */
125         fscache_operation_release_t release;
126 };
127 
128 extern atomic_t fscache_op_debug_id;
129 extern void fscache_op_work_func(struct work_struct *work);
130 
131 extern void fscache_enqueue_operation(struct fscache_operation *);
132 extern void fscache_op_complete(struct fscache_operation *, bool);
133 extern void fscache_put_operation(struct fscache_operation *);
134 extern void fscache_operation_init(struct fscache_cookie *,
135                                    struct fscache_operation *,
136                                    fscache_operation_processor_t,
137                                    fscache_operation_cancel_t,
138                                    fscache_operation_release_t);
139 
140 /*
141  * data read operation
142  */
143 struct fscache_retrieval {
144         struct fscache_operation op;
145         struct fscache_cookie   *cookie;        /* The netfs cookie */
146         struct address_space    *mapping;       /* netfs pages */
147         fscache_rw_complete_t   end_io_func;    /* function to call on I/O completion */
148         void                    *context;       /* netfs read context (pinned) */
149         struct list_head        to_do;          /* list of things to be done by the backend */
150         unsigned long           start_time;     /* time at which retrieval started */
151         atomic_t                n_pages;        /* number of pages to be retrieved */
152 };
153 
154 typedef int (*fscache_page_retrieval_func_t)(struct fscache_retrieval *op,
155                                              struct page *page,
156                                              gfp_t gfp);
157 
158 typedef int (*fscache_pages_retrieval_func_t)(struct fscache_retrieval *op,
159                                               struct list_head *pages,
160                                               unsigned *nr_pages,
161                                               gfp_t gfp);
162 
163 /**
164  * fscache_get_retrieval - Get an extra reference on a retrieval operation
165  * @op: The retrieval operation to get a reference on
166  *
167  * Get an extra reference on a retrieval operation.
168  */
169 static inline
170 struct fscache_retrieval *fscache_get_retrieval(struct fscache_retrieval *op)
171 {
172         atomic_inc(&op->op.usage);
173         return op;
174 }
175 
176 /**
177  * fscache_enqueue_retrieval - Enqueue a retrieval operation for processing
178  * @op: The retrieval operation affected
179  *
180  * Enqueue a retrieval operation for processing by the FS-Cache thread pool.
181  */
182 static inline void fscache_enqueue_retrieval(struct fscache_retrieval *op)
183 {
184         fscache_enqueue_operation(&op->op);
185 }
186 
187 /**
188  * fscache_retrieval_complete - Record (partial) completion of a retrieval
189  * @op: The retrieval operation affected
190  * @n_pages: The number of pages to account for
191  */
192 static inline void fscache_retrieval_complete(struct fscache_retrieval *op,
193                                               int n_pages)
194 {
195         if (atomic_sub_return_relaxed(n_pages, &op->n_pages) <= 0)
196                 fscache_op_complete(&op->op, false);
197 }
198 
199 /**
200  * fscache_put_retrieval - Drop a reference to a retrieval operation
201  * @op: The retrieval operation affected
202  *
203  * Drop a reference to a retrieval operation.
204  */
205 static inline void fscache_put_retrieval(struct fscache_retrieval *op)
206 {
207         fscache_put_operation(&op->op);
208 }
209 
210 /*
211  * cached page storage work item
212  * - used to do three things:
213  *   - batch writes to the cache
214  *   - do cache writes asynchronously
215  *   - defer writes until cache object lookup completion
216  */
217 struct fscache_storage {
218         struct fscache_operation op;
219         pgoff_t                 store_limit;    /* don't write more than this */
220 };
221 
222 /*
223  * cache operations
224  */
225 struct fscache_cache_ops {
226         /* name of cache provider */
227         const char *name;
228 
229         /* allocate an object record for a cookie */
230         struct fscache_object *(*alloc_object)(struct fscache_cache *cache,
231                                                struct fscache_cookie *cookie);
232 
233         /* look up the object for a cookie
234          * - return -ETIMEDOUT to be requeued
235          */
236         int (*lookup_object)(struct fscache_object *object);
237 
238         /* finished looking up */
239         void (*lookup_complete)(struct fscache_object *object);
240 
241         /* increment the usage count on this object (may fail if unmounting) */
242         struct fscache_object *(*grab_object)(struct fscache_object *object,
243                                               enum fscache_obj_ref_trace why);
244 
245         /* pin an object in the cache */
246         int (*pin_object)(struct fscache_object *object);
247 
248         /* unpin an object in the cache */
249         void (*unpin_object)(struct fscache_object *object);
250 
251         /* check the consistency between the backing cache and the FS-Cache
252          * cookie */
253         int (*check_consistency)(struct fscache_operation *op);
254 
255         /* store the updated auxiliary data on an object */
256         void (*update_object)(struct fscache_object *object);
257 
258         /* Invalidate an object */
259         void (*invalidate_object)(struct fscache_operation *op);
260 
261         /* discard the resources pinned by an object and effect retirement if
262          * necessary */
263         void (*drop_object)(struct fscache_object *object);
264 
265         /* dispose of a reference to an object */
266         void (*put_object)(struct fscache_object *object,
267                            enum fscache_obj_ref_trace why);
268 
269         /* sync a cache */
270         void (*sync_cache)(struct fscache_cache *cache);
271 
272         /* notification that the attributes of a non-index object (such as
273          * i_size) have changed */
274         int (*attr_changed)(struct fscache_object *object);
275 
276         /* reserve space for an object's data and associated metadata */
277         int (*reserve_space)(struct fscache_object *object, loff_t i_size);
278 
279         /* request a backing block for a page be read or allocated in the
280          * cache */
281         fscache_page_retrieval_func_t read_or_alloc_page;
282 
283         /* request backing blocks for a list of pages be read or allocated in
284          * the cache */
285         fscache_pages_retrieval_func_t read_or_alloc_pages;
286 
287         /* request a backing block for a page be allocated in the cache so that
288          * it can be written directly */
289         fscache_page_retrieval_func_t allocate_page;
290 
291         /* request backing blocks for pages be allocated in the cache so that
292          * they can be written directly */
293         fscache_pages_retrieval_func_t allocate_pages;
294 
295         /* write a page to its backing block in the cache */
296         int (*write_page)(struct fscache_storage *op, struct page *page);
297 
298         /* detach backing block from a page (optional)
299          * - must release the cookie lock before returning
300          * - may sleep
301          */
302         void (*uncache_page)(struct fscache_object *object,
303                              struct page *page);
304 
305         /* dissociate a cache from all the pages it was backing */
306         void (*dissociate_pages)(struct fscache_cache *cache);
307 };
308 
309 extern struct fscache_cookie fscache_fsdef_index;
310 
311 /*
312  * Event list for fscache_object::{event_mask,events}
313  */
314 enum {
315         FSCACHE_OBJECT_EV_NEW_CHILD,    /* T if object has a new child */
316         FSCACHE_OBJECT_EV_PARENT_READY, /* T if object's parent is ready */
317         FSCACHE_OBJECT_EV_UPDATE,       /* T if object should be updated */
318         FSCACHE_OBJECT_EV_INVALIDATE,   /* T if cache requested object invalidation */
319         FSCACHE_OBJECT_EV_CLEARED,      /* T if accessors all gone */
320         FSCACHE_OBJECT_EV_ERROR,        /* T if fatal error occurred during processing */
321         FSCACHE_OBJECT_EV_KILL,         /* T if netfs relinquished or cache withdrew object */
322         NR_FSCACHE_OBJECT_EVENTS
323 };
324 
325 #define FSCACHE_OBJECT_EVENTS_MASK ((1UL << NR_FSCACHE_OBJECT_EVENTS) - 1)
326 
327 /*
328  * States for object state machine.
329  */
330 struct fscache_transition {
331         unsigned long events;
332         const struct fscache_state *transit_to;
333 };
334 
335 struct fscache_state {
336         char name[24];
337         char short_name[8];
338         const struct fscache_state *(*work)(struct fscache_object *object,
339                                             int event);
340         const struct fscache_transition transitions[];
341 };
342 
343 /*
344  * on-disk cache file or index handle
345  */
346 struct fscache_object {
347         const struct fscache_state *state;      /* Object state machine state */
348         const struct fscache_transition *oob_table; /* OOB state transition table */
349         int                     debug_id;       /* debugging ID */
350         int                     n_children;     /* number of child objects */
351         int                     n_ops;          /* number of extant ops on object */
352         int                     n_obj_ops;      /* number of object ops outstanding on object */
353         int                     n_in_progress;  /* number of ops in progress */
354         int                     n_exclusive;    /* number of exclusive ops queued or in progress */
355         atomic_t                n_reads;        /* number of read ops in progress */
356         spinlock_t              lock;           /* state and operations lock */
357 
358         unsigned long           lookup_jif;     /* time at which lookup started */
359         unsigned long           oob_event_mask; /* OOB events this object is interested in */
360         unsigned long           event_mask;     /* events this object is interested in */
361         unsigned long           events;         /* events to be processed by this object
362                                                  * (order is important - using fls) */
363 
364         unsigned long           flags;
365 #define FSCACHE_OBJECT_LOCK             0       /* T if object is busy being processed */
366 #define FSCACHE_OBJECT_PENDING_WRITE    1       /* T if object has pending write */
367 #define FSCACHE_OBJECT_WAITING          2       /* T if object is waiting on its parent */
368 #define FSCACHE_OBJECT_IS_LIVE          3       /* T if object is not withdrawn or relinquished */
369 #define FSCACHE_OBJECT_IS_LOOKED_UP     4       /* T if object has been looked up */
370 #define FSCACHE_OBJECT_IS_AVAILABLE     5       /* T if object has become active */
371 #define FSCACHE_OBJECT_RETIRED          6       /* T if object was retired on relinquishment */
372 #define FSCACHE_OBJECT_KILLED_BY_CACHE  7       /* T if object was killed by the cache */
373 #define FSCACHE_OBJECT_RUN_AFTER_DEAD   8       /* T if object has been dispatched after death */
374 
375         struct list_head        cache_link;     /* link in cache->object_list */
376         struct hlist_node       cookie_link;    /* link in cookie->backing_objects */
377         struct fscache_cache    *cache;         /* cache that supplied this object */
378         struct fscache_cookie   *cookie;        /* netfs's file/index object */
379         struct fscache_object   *parent;        /* parent object */
380         struct work_struct      work;           /* attention scheduling record */
381         struct list_head        dependents;     /* FIFO of dependent objects */
382         struct list_head        dep_link;       /* link in parent's dependents list */
383         struct list_head        pending_ops;    /* unstarted operations on this object */
384 #ifdef CONFIG_FSCACHE_OBJECT_LIST
385         struct rb_node          objlist_link;   /* link in global object list */
386 #endif
387         pgoff_t                 store_limit;    /* current storage limit */
388         loff_t                  store_limit_l;  /* current storage limit */
389 };
390 
391 extern void fscache_object_init(struct fscache_object *, struct fscache_cookie *,
392                                 struct fscache_cache *);
393 extern void fscache_object_destroy(struct fscache_object *);
394 
395 extern void fscache_object_lookup_negative(struct fscache_object *object);
396 extern void fscache_obtained_object(struct fscache_object *object);
397 
398 static inline bool fscache_object_is_live(struct fscache_object *object)
399 {
400         return test_bit(FSCACHE_OBJECT_IS_LIVE, &object->flags);
401 }
402 
403 static inline bool fscache_object_is_dying(struct fscache_object *object)
404 {
405         return !fscache_object_is_live(object);
406 }
407 
408 static inline bool fscache_object_is_available(struct fscache_object *object)
409 {
410         return test_bit(FSCACHE_OBJECT_IS_AVAILABLE, &object->flags);
411 }
412 
413 static inline bool fscache_cache_is_broken(struct fscache_object *object)
414 {
415         return test_bit(FSCACHE_IOERROR, &object->cache->flags);
416 }
417 
418 static inline bool fscache_object_is_active(struct fscache_object *object)
419 {
420         return fscache_object_is_available(object) &&
421                 fscache_object_is_live(object) &&
422                 !fscache_cache_is_broken(object);
423 }
424 
425 /**
426  * fscache_object_destroyed - Note destruction of an object in a cache
427  * @cache: The cache from which the object came
428  *
429  * Note the destruction and deallocation of an object record in a cache.
430  */
431 static inline void fscache_object_destroyed(struct fscache_cache *cache)
432 {
433         if (atomic_dec_and_test(&cache->object_count))
434                 wake_up_all(&fscache_cache_cleared_wq);
435 }
436 
437 /**
438  * fscache_object_lookup_error - Note an object encountered an error
439  * @object: The object on which the error was encountered
440  *
441  * Note that an object encountered a fatal error (usually an I/O error) and
442  * that it should be withdrawn as soon as possible.
443  */
444 static inline void fscache_object_lookup_error(struct fscache_object *object)
445 {
446         set_bit(FSCACHE_OBJECT_EV_ERROR, &object->events);
447 }
448 
449 /**
450  * fscache_set_store_limit - Set the maximum size to be stored in an object
451  * @object: The object to set the maximum on
452  * @i_size: The limit to set in bytes
453  *
454  * Set the maximum size an object is permitted to reach, implying the highest
455  * byte that may be written.  Intended to be called by the attr_changed() op.
456  *
457  * See Documentation/filesystems/caching/backend-api.txt for a complete
458  * description.
459  */
460 static inline
461 void fscache_set_store_limit(struct fscache_object *object, loff_t i_size)
462 {
463         object->store_limit_l = i_size;
464         object->store_limit = i_size >> PAGE_SHIFT;
465         if (i_size & ~PAGE_MASK)
466                 object->store_limit++;
467 }
468 
469 /**
470  * fscache_end_io - End a retrieval operation on a page
471  * @op: The FS-Cache operation covering the retrieval
472  * @page: The page that was to be fetched
473  * @error: The error code (0 if successful)
474  *
475  * Note the end of an operation to retrieve a page, as covered by a particular
476  * operation record.
477  */
478 static inline void fscache_end_io(struct fscache_retrieval *op,
479                                   struct page *page, int error)
480 {
481         op->end_io_func(page, op->context, error);
482 }
483 
484 static inline void __fscache_use_cookie(struct fscache_cookie *cookie)
485 {
486         atomic_inc(&cookie->n_active);
487 }
488 
489 /**
490  * fscache_use_cookie - Request usage of cookie attached to an object
491  * @object: Object description
492  * 
493  * Request usage of the cookie attached to an object.  NULL is returned if the
494  * relinquishment had reduced the cookie usage count to 0.
495  */
496 static inline bool fscache_use_cookie(struct fscache_object *object)
497 {
498         struct fscache_cookie *cookie = object->cookie;
499         return atomic_inc_not_zero(&cookie->n_active) != 0;
500 }
501 
502 static inline bool __fscache_unuse_cookie(struct fscache_cookie *cookie)
503 {
504         return atomic_dec_and_test(&cookie->n_active);
505 }
506 
507 static inline void __fscache_wake_unused_cookie(struct fscache_cookie *cookie)
508 {
509         wake_up_var(&cookie->n_active);
510 }
511 
512 /**
513  * fscache_unuse_cookie - Cease usage of cookie attached to an object
514  * @object: Object description
515  * 
516  * Cease usage of the cookie attached to an object.  When the users count
517  * reaches zero then the cookie relinquishment will be permitted to proceed.
518  */
519 static inline void fscache_unuse_cookie(struct fscache_object *object)
520 {
521         struct fscache_cookie *cookie = object->cookie;
522         if (__fscache_unuse_cookie(cookie))
523                 __fscache_wake_unused_cookie(cookie);
524 }
525 
526 /*
527  * out-of-line cache backend functions
528  */
529 extern __printf(3, 4)
530 void fscache_init_cache(struct fscache_cache *cache,
531                         const struct fscache_cache_ops *ops,
532                         const char *idfmt, ...);
533 
534 extern int fscache_add_cache(struct fscache_cache *cache,
535                              struct fscache_object *fsdef,
536                              const char *tagname);
537 extern void fscache_withdraw_cache(struct fscache_cache *cache);
538 
539 extern void fscache_io_error(struct fscache_cache *cache);
540 
541 extern void fscache_mark_page_cached(struct fscache_retrieval *op,
542                                      struct page *page);
543 
544 extern void fscache_mark_pages_cached(struct fscache_retrieval *op,
545                                       struct pagevec *pagevec);
546 
547 extern bool fscache_object_sleep_till_congested(signed long *timeoutp);
548 
549 extern enum fscache_checkaux fscache_check_aux(struct fscache_object *object,
550                                                const void *data,
551                                                uint16_t datalen,
552                                                loff_t object_size);
553 
554 extern void fscache_object_retrying_stale(struct fscache_object *object);
555 
556 enum fscache_why_object_killed {
557         FSCACHE_OBJECT_IS_STALE,
558         FSCACHE_OBJECT_NO_SPACE,
559         FSCACHE_OBJECT_WAS_RETIRED,
560         FSCACHE_OBJECT_WAS_CULLED,
561 };
562 extern void fscache_object_mark_killed(struct fscache_object *object,
563                                        enum fscache_why_object_killed why);
564 
565 #endif /* _LINUX_FSCACHE_CACHE_H */
566 

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