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TOMOYO Linux Cross Reference
Linux/include/linux/swap.h

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  1 #ifndef _LINUX_SWAP_H
  2 #define _LINUX_SWAP_H
  3 
  4 #include <linux/spinlock.h>
  5 #include <linux/linkage.h>
  6 #include <linux/mmzone.h>
  7 #include <linux/list.h>
  8 #include <linux/memcontrol.h>
  9 #include <linux/sched.h>
 10 #include <linux/node.h>
 11 #include <linux/fs.h>
 12 #include <linux/atomic.h>
 13 #include <linux/page-flags.h>
 14 #include <asm/page.h>
 15 
 16 struct notifier_block;
 17 
 18 struct bio;
 19 
 20 #define SWAP_FLAG_PREFER        0x8000  /* set if swap priority specified */
 21 #define SWAP_FLAG_PRIO_MASK     0x7fff
 22 #define SWAP_FLAG_PRIO_SHIFT    0
 23 #define SWAP_FLAG_DISCARD       0x10000 /* enable discard for swap */
 24 #define SWAP_FLAG_DISCARD_ONCE  0x20000 /* discard swap area at swapon-time */
 25 #define SWAP_FLAG_DISCARD_PAGES 0x40000 /* discard page-clusters after use */
 26 
 27 #define SWAP_FLAGS_VALID        (SWAP_FLAG_PRIO_MASK | SWAP_FLAG_PREFER | \
 28                                  SWAP_FLAG_DISCARD | SWAP_FLAG_DISCARD_ONCE | \
 29                                  SWAP_FLAG_DISCARD_PAGES)
 30 
 31 static inline int current_is_kswapd(void)
 32 {
 33         return current->flags & PF_KSWAPD;
 34 }
 35 
 36 /*
 37  * MAX_SWAPFILES defines the maximum number of swaptypes: things which can
 38  * be swapped to.  The swap type and the offset into that swap type are
 39  * encoded into pte's and into pgoff_t's in the swapcache.  Using five bits
 40  * for the type means that the maximum number of swapcache pages is 27 bits
 41  * on 32-bit-pgoff_t architectures.  And that assumes that the architecture packs
 42  * the type/offset into the pte as 5/27 as well.
 43  */
 44 #define MAX_SWAPFILES_SHIFT     5
 45 
 46 /*
 47  * Use some of the swap files numbers for other purposes. This
 48  * is a convenient way to hook into the VM to trigger special
 49  * actions on faults.
 50  */
 51 
 52 /*
 53  * NUMA node memory migration support
 54  */
 55 #ifdef CONFIG_MIGRATION
 56 #define SWP_MIGRATION_NUM 2
 57 #define SWP_MIGRATION_READ      (MAX_SWAPFILES + SWP_HWPOISON_NUM)
 58 #define SWP_MIGRATION_WRITE     (MAX_SWAPFILES + SWP_HWPOISON_NUM + 1)
 59 #else
 60 #define SWP_MIGRATION_NUM 0
 61 #endif
 62 
 63 /*
 64  * Handling of hardware poisoned pages with memory corruption.
 65  */
 66 #ifdef CONFIG_MEMORY_FAILURE
 67 #define SWP_HWPOISON_NUM 1
 68 #define SWP_HWPOISON            MAX_SWAPFILES
 69 #else
 70 #define SWP_HWPOISON_NUM 0
 71 #endif
 72 
 73 #define MAX_SWAPFILES \
 74         ((1 << MAX_SWAPFILES_SHIFT) - SWP_MIGRATION_NUM - SWP_HWPOISON_NUM)
 75 
 76 /*
 77  * Magic header for a swap area. The first part of the union is
 78  * what the swap magic looks like for the old (limited to 128MB)
 79  * swap area format, the second part of the union adds - in the
 80  * old reserved area - some extra information. Note that the first
 81  * kilobyte is reserved for boot loader or disk label stuff...
 82  *
 83  * Having the magic at the end of the PAGE_SIZE makes detecting swap
 84  * areas somewhat tricky on machines that support multiple page sizes.
 85  * For 2.5 we'll probably want to move the magic to just beyond the
 86  * bootbits...
 87  */
 88 union swap_header {
 89         struct {
 90                 char reserved[PAGE_SIZE - 10];
 91                 char magic[10];                 /* SWAP-SPACE or SWAPSPACE2 */
 92         } magic;
 93         struct {
 94                 char            bootbits[1024]; /* Space for disklabel etc. */
 95                 __u32           version;
 96                 __u32           last_page;
 97                 __u32           nr_badpages;
 98                 unsigned char   sws_uuid[16];
 99                 unsigned char   sws_volume[16];
100                 __u32           padding[117];
101                 __u32           badpages[1];
102         } info;
103 };
104 
105 /*
106  * current->reclaim_state points to one of these when a task is running
107  * memory reclaim
108  */
109 struct reclaim_state {
110         unsigned long reclaimed_slab;
111 };
112 
113 #ifdef __KERNEL__
114 
115 struct address_space;
116 struct sysinfo;
117 struct writeback_control;
118 struct zone;
119 
120 /*
121  * A swap extent maps a range of a swapfile's PAGE_SIZE pages onto a range of
122  * disk blocks.  A list of swap extents maps the entire swapfile.  (Where the
123  * term `swapfile' refers to either a blockdevice or an IS_REG file.  Apart
124  * from setup, they're handled identically.
125  *
126  * We always assume that blocks are of size PAGE_SIZE.
127  */
128 struct swap_extent {
129         struct list_head list;
130         pgoff_t start_page;
131         pgoff_t nr_pages;
132         sector_t start_block;
133 };
134 
135 /*
136  * Max bad pages in the new format..
137  */
138 #define __swapoffset(x) ((unsigned long)&((union swap_header *)0)->x)
139 #define MAX_SWAP_BADPAGES \
140         ((__swapoffset(magic.magic) - __swapoffset(info.badpages)) / sizeof(int))
141 
142 enum {
143         SWP_USED        = (1 << 0),     /* is slot in swap_info[] used? */
144         SWP_WRITEOK     = (1 << 1),     /* ok to write to this swap?    */
145         SWP_DISCARDABLE = (1 << 2),     /* blkdev support discard */
146         SWP_DISCARDING  = (1 << 3),     /* now discarding a free cluster */
147         SWP_SOLIDSTATE  = (1 << 4),     /* blkdev seeks are cheap */
148         SWP_CONTINUED   = (1 << 5),     /* swap_map has count continuation */
149         SWP_BLKDEV      = (1 << 6),     /* its a block device */
150         SWP_FILE        = (1 << 7),     /* set after swap_activate success */
151         SWP_AREA_DISCARD = (1 << 8),    /* single-time swap area discards */
152         SWP_PAGE_DISCARD = (1 << 9),    /* freed swap page-cluster discards */
153                                         /* add others here before... */
154         SWP_SCANNING    = (1 << 10),    /* refcount in scan_swap_map */
155 };
156 
157 #define SWAP_CLUSTER_MAX 32UL
158 #define COMPACT_CLUSTER_MAX SWAP_CLUSTER_MAX
159 
160 #define SWAP_MAP_MAX    0x3e    /* Max duplication count, in first swap_map */
161 #define SWAP_MAP_BAD    0x3f    /* Note pageblock is bad, in first swap_map */
162 #define SWAP_HAS_CACHE  0x40    /* Flag page is cached, in first swap_map */
163 #define SWAP_CONT_MAX   0x7f    /* Max count, in each swap_map continuation */
164 #define COUNT_CONTINUED 0x80    /* See swap_map continuation for full count */
165 #define SWAP_MAP_SHMEM  0xbf    /* Owned by shmem/tmpfs, in first swap_map */
166 
167 /*
168  * We use this to track usage of a cluster. A cluster is a block of swap disk
169  * space with SWAPFILE_CLUSTER pages long and naturally aligns in disk. All
170  * free clusters are organized into a list. We fetch an entry from the list to
171  * get a free cluster.
172  *
173  * The data field stores next cluster if the cluster is free or cluster usage
174  * counter otherwise. The flags field determines if a cluster is free. This is
175  * protected by swap_info_struct.lock.
176  */
177 struct swap_cluster_info {
178         unsigned int data:24;
179         unsigned int flags:8;
180 };
181 #define CLUSTER_FLAG_FREE 1 /* This cluster is free */
182 #define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */
183 
184 /*
185  * We assign a cluster to each CPU, so each CPU can allocate swap entry from
186  * its own cluster and swapout sequentially. The purpose is to optimize swapout
187  * throughput.
188  */
189 struct percpu_cluster {
190         struct swap_cluster_info index; /* Current cluster index */
191         unsigned int next; /* Likely next allocation offset */
192 };
193 
194 /*
195  * The in-memory structure used to track swap areas.
196  */
197 struct swap_info_struct {
198         unsigned long   flags;          /* SWP_USED etc: see above */
199         signed short    prio;           /* swap priority of this type */
200         struct plist_node list;         /* entry in swap_active_head */
201         struct plist_node avail_list;   /* entry in swap_avail_head */
202         signed char     type;           /* strange name for an index */
203         unsigned int    max;            /* extent of the swap_map */
204         unsigned char *swap_map;        /* vmalloc'ed array of usage counts */
205         struct swap_cluster_info *cluster_info; /* cluster info. Only for SSD */
206         struct swap_cluster_info free_cluster_head; /* free cluster list head */
207         struct swap_cluster_info free_cluster_tail; /* free cluster list tail */
208         unsigned int lowest_bit;        /* index of first free in swap_map */
209         unsigned int highest_bit;       /* index of last free in swap_map */
210         unsigned int pages;             /* total of usable pages of swap */
211         unsigned int inuse_pages;       /* number of those currently in use */
212         unsigned int cluster_next;      /* likely index for next allocation */
213         unsigned int cluster_nr;        /* countdown to next cluster search */
214         struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */
215         struct swap_extent *curr_swap_extent;
216         struct swap_extent first_swap_extent;
217         struct block_device *bdev;      /* swap device or bdev of swap file */
218         struct file *swap_file;         /* seldom referenced */
219         unsigned int old_block_size;    /* seldom referenced */
220 #ifdef CONFIG_FRONTSWAP
221         unsigned long *frontswap_map;   /* frontswap in-use, one bit per page */
222         atomic_t frontswap_pages;       /* frontswap pages in-use counter */
223 #endif
224         spinlock_t lock;                /*
225                                          * protect map scan related fields like
226                                          * swap_map, lowest_bit, highest_bit,
227                                          * inuse_pages, cluster_next,
228                                          * cluster_nr, lowest_alloc,
229                                          * highest_alloc, free/discard cluster
230                                          * list. other fields are only changed
231                                          * at swapon/swapoff, so are protected
232                                          * by swap_lock. changing flags need
233                                          * hold this lock and swap_lock. If
234                                          * both locks need hold, hold swap_lock
235                                          * first.
236                                          */
237         struct work_struct discard_work; /* discard worker */
238         struct swap_cluster_info discard_cluster_head; /* list head of discard clusters */
239         struct swap_cluster_info discard_cluster_tail; /* list tail of discard clusters */
240 };
241 
242 /* linux/mm/workingset.c */
243 void *workingset_eviction(struct address_space *mapping, struct page *page);
244 bool workingset_refault(void *shadow);
245 void workingset_activation(struct page *page);
246 extern struct list_lru workingset_shadow_nodes;
247 
248 static inline unsigned int workingset_node_pages(struct radix_tree_node *node)
249 {
250         return node->count & RADIX_TREE_COUNT_MASK;
251 }
252 
253 static inline void workingset_node_pages_inc(struct radix_tree_node *node)
254 {
255         node->count++;
256 }
257 
258 static inline void workingset_node_pages_dec(struct radix_tree_node *node)
259 {
260         VM_WARN_ON_ONCE(!workingset_node_pages(node));
261         node->count--;
262 }
263 
264 static inline unsigned int workingset_node_shadows(struct radix_tree_node *node)
265 {
266         return node->count >> RADIX_TREE_COUNT_SHIFT;
267 }
268 
269 static inline void workingset_node_shadows_inc(struct radix_tree_node *node)
270 {
271         node->count += 1U << RADIX_TREE_COUNT_SHIFT;
272 }
273 
274 static inline void workingset_node_shadows_dec(struct radix_tree_node *node)
275 {
276         VM_WARN_ON_ONCE(!workingset_node_shadows(node));
277         node->count -= 1U << RADIX_TREE_COUNT_SHIFT;
278 }
279 
280 /* linux/mm/page_alloc.c */
281 extern unsigned long totalram_pages;
282 extern unsigned long totalreserve_pages;
283 extern unsigned long nr_free_buffer_pages(void);
284 extern unsigned long nr_free_pagecache_pages(void);
285 
286 /* Definition of global_page_state not available yet */
287 #define nr_free_pages() global_page_state(NR_FREE_PAGES)
288 
289 
290 /* linux/mm/swap.c */
291 extern void lru_cache_add(struct page *);
292 extern void lru_cache_add_anon(struct page *page);
293 extern void lru_cache_add_file(struct page *page);
294 extern void lru_add_page_tail(struct page *page, struct page *page_tail,
295                          struct lruvec *lruvec, struct list_head *head);
296 extern void activate_page(struct page *);
297 extern void mark_page_accessed(struct page *);
298 extern void lru_add_drain(void);
299 extern void lru_add_drain_cpu(int cpu);
300 extern void lru_add_drain_all(void);
301 extern void rotate_reclaimable_page(struct page *page);
302 extern void deactivate_file_page(struct page *page);
303 extern void deactivate_page(struct page *page);
304 extern void swap_setup(void);
305 
306 extern void add_page_to_unevictable_list(struct page *page);
307 
308 extern void lru_cache_add_active_or_unevictable(struct page *page,
309                                                 struct vm_area_struct *vma);
310 
311 /* linux/mm/vmscan.c */
312 extern unsigned long zone_reclaimable_pages(struct zone *zone);
313 extern unsigned long pgdat_reclaimable_pages(struct pglist_data *pgdat);
314 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
315                                         gfp_t gfp_mask, nodemask_t *mask);
316 extern int __isolate_lru_page(struct page *page, isolate_mode_t mode);
317 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
318                                                   unsigned long nr_pages,
319                                                   gfp_t gfp_mask,
320                                                   bool may_swap);
321 extern unsigned long mem_cgroup_shrink_node(struct mem_cgroup *mem,
322                                                 gfp_t gfp_mask, bool noswap,
323                                                 pg_data_t *pgdat,
324                                                 unsigned long *nr_scanned);
325 extern unsigned long shrink_all_memory(unsigned long nr_pages);
326 extern int vm_swappiness;
327 extern int remove_mapping(struct address_space *mapping, struct page *page);
328 extern unsigned long vm_total_pages;
329 
330 #ifdef CONFIG_NUMA
331 extern int node_reclaim_mode;
332 extern int sysctl_min_unmapped_ratio;
333 extern int sysctl_min_slab_ratio;
334 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int);
335 #else
336 #define node_reclaim_mode 0
337 static inline int node_reclaim(struct pglist_data *pgdat, gfp_t mask,
338                                 unsigned int order)
339 {
340         return 0;
341 }
342 #endif
343 
344 extern int page_evictable(struct page *page);
345 extern void check_move_unevictable_pages(struct page **, int nr_pages);
346 
347 extern int kswapd_run(int nid);
348 extern void kswapd_stop(int nid);
349 
350 #ifdef CONFIG_SWAP
351 /* linux/mm/page_io.c */
352 extern int swap_readpage(struct page *);
353 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
354 extern void end_swap_bio_write(struct bio *bio);
355 extern int __swap_writepage(struct page *page, struct writeback_control *wbc,
356         bio_end_io_t end_write_func);
357 extern int swap_set_page_dirty(struct page *page);
358 
359 int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
360                 unsigned long nr_pages, sector_t start_block);
361 int generic_swapfile_activate(struct swap_info_struct *, struct file *,
362                 sector_t *);
363 
364 /* linux/mm/swap_state.c */
365 extern struct address_space swapper_spaces[];
366 #define swap_address_space(entry) (&swapper_spaces[swp_type(entry)])
367 extern unsigned long total_swapcache_pages(void);
368 extern void show_swap_cache_info(void);
369 extern int add_to_swap(struct page *, struct list_head *list);
370 extern int add_to_swap_cache(struct page *, swp_entry_t, gfp_t);
371 extern int __add_to_swap_cache(struct page *page, swp_entry_t entry);
372 extern void __delete_from_swap_cache(struct page *);
373 extern void delete_from_swap_cache(struct page *);
374 extern void free_page_and_swap_cache(struct page *);
375 extern void free_pages_and_swap_cache(struct page **, int);
376 extern struct page *lookup_swap_cache(swp_entry_t);
377 extern struct page *read_swap_cache_async(swp_entry_t, gfp_t,
378                         struct vm_area_struct *vma, unsigned long addr);
379 extern struct page *__read_swap_cache_async(swp_entry_t, gfp_t,
380                         struct vm_area_struct *vma, unsigned long addr,
381                         bool *new_page_allocated);
382 extern struct page *swapin_readahead(swp_entry_t, gfp_t,
383                         struct vm_area_struct *vma, unsigned long addr);
384 
385 /* linux/mm/swapfile.c */
386 extern atomic_long_t nr_swap_pages;
387 extern long total_swap_pages;
388 
389 /* Swap 50% full? Release swapcache more aggressively.. */
390 static inline bool vm_swap_full(void)
391 {
392         return atomic_long_read(&nr_swap_pages) * 2 < total_swap_pages;
393 }
394 
395 static inline long get_nr_swap_pages(void)
396 {
397         return atomic_long_read(&nr_swap_pages);
398 }
399 
400 extern void si_swapinfo(struct sysinfo *);
401 extern swp_entry_t get_swap_page(void);
402 extern swp_entry_t get_swap_page_of_type(int);
403 extern int add_swap_count_continuation(swp_entry_t, gfp_t);
404 extern void swap_shmem_alloc(swp_entry_t);
405 extern int swap_duplicate(swp_entry_t);
406 extern int swapcache_prepare(swp_entry_t);
407 extern void swap_free(swp_entry_t);
408 extern void swapcache_free(swp_entry_t);
409 extern int free_swap_and_cache(swp_entry_t);
410 extern int swap_type_of(dev_t, sector_t, struct block_device **);
411 extern unsigned int count_swap_pages(int, int);
412 extern sector_t map_swap_page(struct page *, struct block_device **);
413 extern sector_t swapdev_block(int, pgoff_t);
414 extern int page_swapcount(struct page *);
415 extern int swp_swapcount(swp_entry_t entry);
416 extern struct swap_info_struct *page_swap_info(struct page *);
417 extern bool reuse_swap_page(struct page *, int *);
418 extern int try_to_free_swap(struct page *);
419 struct backing_dev_info;
420 
421 #else /* CONFIG_SWAP */
422 
423 #define swap_address_space(entry)               (NULL)
424 #define get_nr_swap_pages()                     0L
425 #define total_swap_pages                        0L
426 #define total_swapcache_pages()                 0UL
427 #define vm_swap_full()                          0
428 
429 #define si_swapinfo(val) \
430         do { (val)->freeswap = (val)->totalswap = 0; } while (0)
431 /* only sparc can not include linux/pagemap.h in this file
432  * so leave put_page and release_pages undeclared... */
433 #define free_page_and_swap_cache(page) \
434         put_page(page)
435 #define free_pages_and_swap_cache(pages, nr) \
436         release_pages((pages), (nr), false);
437 
438 static inline void show_swap_cache_info(void)
439 {
440 }
441 
442 #define free_swap_and_cache(swp)        is_migration_entry(swp)
443 #define swapcache_prepare(swp)          is_migration_entry(swp)
444 
445 static inline int add_swap_count_continuation(swp_entry_t swp, gfp_t gfp_mask)
446 {
447         return 0;
448 }
449 
450 static inline void swap_shmem_alloc(swp_entry_t swp)
451 {
452 }
453 
454 static inline int swap_duplicate(swp_entry_t swp)
455 {
456         return 0;
457 }
458 
459 static inline void swap_free(swp_entry_t swp)
460 {
461 }
462 
463 static inline void swapcache_free(swp_entry_t swp)
464 {
465 }
466 
467 static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
468                         struct vm_area_struct *vma, unsigned long addr)
469 {
470         return NULL;
471 }
472 
473 static inline int swap_writepage(struct page *p, struct writeback_control *wbc)
474 {
475         return 0;
476 }
477 
478 static inline struct page *lookup_swap_cache(swp_entry_t swp)
479 {
480         return NULL;
481 }
482 
483 static inline int add_to_swap(struct page *page, struct list_head *list)
484 {
485         return 0;
486 }
487 
488 static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
489                                                         gfp_t gfp_mask)
490 {
491         return -1;
492 }
493 
494 static inline void __delete_from_swap_cache(struct page *page)
495 {
496 }
497 
498 static inline void delete_from_swap_cache(struct page *page)
499 {
500 }
501 
502 static inline int page_swapcount(struct page *page)
503 {
504         return 0;
505 }
506 
507 static inline int swp_swapcount(swp_entry_t entry)
508 {
509         return 0;
510 }
511 
512 #define reuse_swap_page(page, total_mapcount) \
513         (page_trans_huge_mapcount(page, total_mapcount) == 1)
514 
515 static inline int try_to_free_swap(struct page *page)
516 {
517         return 0;
518 }
519 
520 static inline swp_entry_t get_swap_page(void)
521 {
522         swp_entry_t entry;
523         entry.val = 0;
524         return entry;
525 }
526 
527 #endif /* CONFIG_SWAP */
528 
529 #ifdef CONFIG_MEMCG
530 static inline int mem_cgroup_swappiness(struct mem_cgroup *memcg)
531 {
532         /* Cgroup2 doesn't have per-cgroup swappiness */
533         if (cgroup_subsys_on_dfl(memory_cgrp_subsys))
534                 return vm_swappiness;
535 
536         /* root ? */
537         if (mem_cgroup_disabled() || !memcg->css.parent)
538                 return vm_swappiness;
539 
540         return memcg->swappiness;
541 }
542 
543 #else
544 static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
545 {
546         return vm_swappiness;
547 }
548 #endif
549 
550 #ifdef CONFIG_MEMCG_SWAP
551 extern void mem_cgroup_swapout(struct page *page, swp_entry_t entry);
552 extern int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry);
553 extern void mem_cgroup_uncharge_swap(swp_entry_t entry);
554 extern long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg);
555 extern bool mem_cgroup_swap_full(struct page *page);
556 #else
557 static inline void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
558 {
559 }
560 
561 static inline int mem_cgroup_try_charge_swap(struct page *page,
562                                              swp_entry_t entry)
563 {
564         return 0;
565 }
566 
567 static inline void mem_cgroup_uncharge_swap(swp_entry_t entry)
568 {
569 }
570 
571 static inline long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg)
572 {
573         return get_nr_swap_pages();
574 }
575 
576 static inline bool mem_cgroup_swap_full(struct page *page)
577 {
578         return vm_swap_full();
579 }
580 #endif
581 
582 #endif /* __KERNEL__*/
583 #endif /* _LINUX_SWAP_H */
584 

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