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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 /*
161  * Ratio between zone->managed_pages and the "gap" that above the per-zone
162  * "high_wmark". While balancing nodes, We allow kswapd to shrink zones that
163  * do not meet the (high_wmark + gap) watermark, even which already met the
164  * high_wmark, in order to provide better per-zone lru behavior. We are ok to
165  * spend not more than 1% of the memory for this zone balancing "gap".
166  */
167 #define KSWAPD_ZONE_BALANCE_GAP_RATIO 100
168 
169 #define SWAP_MAP_MAX    0x3e    /* Max duplication count, in first swap_map */
170 #define SWAP_MAP_BAD    0x3f    /* Note pageblock is bad, in first swap_map */
171 #define SWAP_HAS_CACHE  0x40    /* Flag page is cached, in first swap_map */
172 #define SWAP_CONT_MAX   0x7f    /* Max count, in each swap_map continuation */
173 #define COUNT_CONTINUED 0x80    /* See swap_map continuation for full count */
174 #define SWAP_MAP_SHMEM  0xbf    /* Owned by shmem/tmpfs, in first swap_map */
175 
176 /*
177  * We use this to track usage of a cluster. A cluster is a block of swap disk
178  * space with SWAPFILE_CLUSTER pages long and naturally aligns in disk. All
179  * free clusters are organized into a list. We fetch an entry from the list to
180  * get a free cluster.
181  *
182  * The data field stores next cluster if the cluster is free or cluster usage
183  * counter otherwise. The flags field determines if a cluster is free. This is
184  * protected by swap_info_struct.lock.
185  */
186 struct swap_cluster_info {
187         unsigned int data:24;
188         unsigned int flags:8;
189 };
190 #define CLUSTER_FLAG_FREE 1 /* This cluster is free */
191 #define CLUSTER_FLAG_NEXT_NULL 2 /* This cluster has no next cluster */
192 
193 /*
194  * We assign a cluster to each CPU, so each CPU can allocate swap entry from
195  * its own cluster and swapout sequentially. The purpose is to optimize swapout
196  * throughput.
197  */
198 struct percpu_cluster {
199         struct swap_cluster_info index; /* Current cluster index */
200         unsigned int next; /* Likely next allocation offset */
201 };
202 
203 /*
204  * The in-memory structure used to track swap areas.
205  */
206 struct swap_info_struct {
207         unsigned long   flags;          /* SWP_USED etc: see above */
208         signed short    prio;           /* swap priority of this type */
209         struct plist_node list;         /* entry in swap_active_head */
210         struct plist_node avail_list;   /* entry in swap_avail_head */
211         signed char     type;           /* strange name for an index */
212         unsigned int    max;            /* extent of the swap_map */
213         unsigned char *swap_map;        /* vmalloc'ed array of usage counts */
214         struct swap_cluster_info *cluster_info; /* cluster info. Only for SSD */
215         struct swap_cluster_info free_cluster_head; /* free cluster list head */
216         struct swap_cluster_info free_cluster_tail; /* free cluster list tail */
217         unsigned int lowest_bit;        /* index of first free in swap_map */
218         unsigned int highest_bit;       /* index of last free in swap_map */
219         unsigned int pages;             /* total of usable pages of swap */
220         unsigned int inuse_pages;       /* number of those currently in use */
221         unsigned int cluster_next;      /* likely index for next allocation */
222         unsigned int cluster_nr;        /* countdown to next cluster search */
223         struct percpu_cluster __percpu *percpu_cluster; /* per cpu's swap location */
224         struct swap_extent *curr_swap_extent;
225         struct swap_extent first_swap_extent;
226         struct block_device *bdev;      /* swap device or bdev of swap file */
227         struct file *swap_file;         /* seldom referenced */
228         unsigned int old_block_size;    /* seldom referenced */
229 #ifdef CONFIG_FRONTSWAP
230         unsigned long *frontswap_map;   /* frontswap in-use, one bit per page */
231         atomic_t frontswap_pages;       /* frontswap pages in-use counter */
232 #endif
233         spinlock_t lock;                /*
234                                          * protect map scan related fields like
235                                          * swap_map, lowest_bit, highest_bit,
236                                          * inuse_pages, cluster_next,
237                                          * cluster_nr, lowest_alloc,
238                                          * highest_alloc, free/discard cluster
239                                          * list. other fields are only changed
240                                          * at swapon/swapoff, so are protected
241                                          * by swap_lock. changing flags need
242                                          * hold this lock and swap_lock. If
243                                          * both locks need hold, hold swap_lock
244                                          * first.
245                                          */
246         struct work_struct discard_work; /* discard worker */
247         struct swap_cluster_info discard_cluster_head; /* list head of discard clusters */
248         struct swap_cluster_info discard_cluster_tail; /* list tail of discard clusters */
249 };
250 
251 /* linux/mm/workingset.c */
252 void *workingset_eviction(struct address_space *mapping, struct page *page);
253 bool workingset_refault(void *shadow);
254 void workingset_activation(struct page *page);
255 extern struct list_lru workingset_shadow_nodes;
256 
257 static inline unsigned int workingset_node_pages(struct radix_tree_node *node)
258 {
259         return node->count & RADIX_TREE_COUNT_MASK;
260 }
261 
262 static inline void workingset_node_pages_inc(struct radix_tree_node *node)
263 {
264         node->count++;
265 }
266 
267 static inline void workingset_node_pages_dec(struct radix_tree_node *node)
268 {
269         node->count--;
270 }
271 
272 static inline unsigned int workingset_node_shadows(struct radix_tree_node *node)
273 {
274         return node->count >> RADIX_TREE_COUNT_SHIFT;
275 }
276 
277 static inline void workingset_node_shadows_inc(struct radix_tree_node *node)
278 {
279         node->count += 1U << RADIX_TREE_COUNT_SHIFT;
280 }
281 
282 static inline void workingset_node_shadows_dec(struct radix_tree_node *node)
283 {
284         node->count -= 1U << RADIX_TREE_COUNT_SHIFT;
285 }
286 
287 /* linux/mm/page_alloc.c */
288 extern unsigned long totalram_pages;
289 extern unsigned long totalreserve_pages;
290 extern unsigned long dirty_balance_reserve;
291 extern unsigned long nr_free_buffer_pages(void);
292 extern unsigned long nr_free_pagecache_pages(void);
293 
294 /* Definition of global_page_state not available yet */
295 #define nr_free_pages() global_page_state(NR_FREE_PAGES)
296 
297 
298 /* linux/mm/swap.c */
299 extern void lru_cache_add(struct page *);
300 extern void lru_cache_add_anon(struct page *page);
301 extern void lru_cache_add_file(struct page *page);
302 extern void lru_add_page_tail(struct page *page, struct page *page_tail,
303                          struct lruvec *lruvec, struct list_head *head);
304 extern void activate_page(struct page *);
305 extern void mark_page_accessed(struct page *);
306 extern void lru_add_drain(void);
307 extern void lru_add_drain_cpu(int cpu);
308 extern void lru_add_drain_all(void);
309 extern void rotate_reclaimable_page(struct page *page);
310 extern void deactivate_file_page(struct page *page);
311 extern void swap_setup(void);
312 
313 extern void add_page_to_unevictable_list(struct page *page);
314 
315 extern void lru_cache_add_active_or_unevictable(struct page *page,
316                                                 struct vm_area_struct *vma);
317 
318 /* linux/mm/vmscan.c */
319 extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
320                                         gfp_t gfp_mask, nodemask_t *mask);
321 extern int __isolate_lru_page(struct page *page, isolate_mode_t mode);
322 extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *memcg,
323                                                   unsigned long nr_pages,
324                                                   gfp_t gfp_mask,
325                                                   bool may_swap);
326 extern unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *mem,
327                                                 gfp_t gfp_mask, bool noswap,
328                                                 struct zone *zone,
329                                                 unsigned long *nr_scanned);
330 extern unsigned long shrink_all_memory(unsigned long nr_pages);
331 extern int vm_swappiness;
332 extern int remove_mapping(struct address_space *mapping, struct page *page);
333 extern unsigned long vm_total_pages;
334 
335 #ifdef CONFIG_NUMA
336 extern int zone_reclaim_mode;
337 extern int sysctl_min_unmapped_ratio;
338 extern int sysctl_min_slab_ratio;
339 extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
340 #else
341 #define zone_reclaim_mode 0
342 static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
343 {
344         return 0;
345 }
346 #endif
347 
348 extern int page_evictable(struct page *page);
349 extern void check_move_unevictable_pages(struct page **, int nr_pages);
350 
351 extern int kswapd_run(int nid);
352 extern void kswapd_stop(int nid);
353 #ifdef CONFIG_MEMCG
354 extern int mem_cgroup_swappiness(struct mem_cgroup *mem);
355 #else
356 static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
357 {
358         return vm_swappiness;
359 }
360 #endif
361 #ifdef CONFIG_MEMCG_SWAP
362 extern void mem_cgroup_swapout(struct page *page, swp_entry_t entry);
363 extern void mem_cgroup_uncharge_swap(swp_entry_t entry);
364 #else
365 static inline void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
366 {
367 }
368 static inline void mem_cgroup_uncharge_swap(swp_entry_t entry)
369 {
370 }
371 #endif
372 #ifdef CONFIG_SWAP
373 /* linux/mm/page_io.c */
374 extern int swap_readpage(struct page *);
375 extern int swap_writepage(struct page *page, struct writeback_control *wbc);
376 extern void end_swap_bio_write(struct bio *bio, int err);
377 extern int __swap_writepage(struct page *page, struct writeback_control *wbc,
378         void (*end_write_func)(struct bio *, int));
379 extern int swap_set_page_dirty(struct page *page);
380 
381 int add_swap_extent(struct swap_info_struct *sis, unsigned long start_page,
382                 unsigned long nr_pages, sector_t start_block);
383 int generic_swapfile_activate(struct swap_info_struct *, struct file *,
384                 sector_t *);
385 
386 /* linux/mm/swap_state.c */
387 extern struct address_space swapper_spaces[];
388 #define swap_address_space(entry) (&swapper_spaces[swp_type(entry)])
389 extern unsigned long total_swapcache_pages(void);
390 extern void show_swap_cache_info(void);
391 extern int add_to_swap(struct page *, struct list_head *list);
392 extern int add_to_swap_cache(struct page *, swp_entry_t, gfp_t);
393 extern int __add_to_swap_cache(struct page *page, swp_entry_t entry);
394 extern void __delete_from_swap_cache(struct page *);
395 extern void delete_from_swap_cache(struct page *);
396 extern void free_page_and_swap_cache(struct page *);
397 extern void free_pages_and_swap_cache(struct page **, int);
398 extern struct page *lookup_swap_cache(swp_entry_t);
399 extern struct page *read_swap_cache_async(swp_entry_t, gfp_t,
400                         struct vm_area_struct *vma, unsigned long addr);
401 extern struct page *swapin_readahead(swp_entry_t, gfp_t,
402                         struct vm_area_struct *vma, unsigned long addr);
403 
404 /* linux/mm/swapfile.c */
405 extern atomic_long_t nr_swap_pages;
406 extern long total_swap_pages;
407 
408 /* Swap 50% full? Release swapcache more aggressively.. */
409 static inline bool vm_swap_full(void)
410 {
411         return atomic_long_read(&nr_swap_pages) * 2 < total_swap_pages;
412 }
413 
414 static inline long get_nr_swap_pages(void)
415 {
416         return atomic_long_read(&nr_swap_pages);
417 }
418 
419 extern void si_swapinfo(struct sysinfo *);
420 extern swp_entry_t get_swap_page(void);
421 extern swp_entry_t get_swap_page_of_type(int);
422 extern int add_swap_count_continuation(swp_entry_t, gfp_t);
423 extern void swap_shmem_alloc(swp_entry_t);
424 extern int swap_duplicate(swp_entry_t);
425 extern int swapcache_prepare(swp_entry_t);
426 extern void swap_free(swp_entry_t);
427 extern void swapcache_free(swp_entry_t);
428 extern int free_swap_and_cache(swp_entry_t);
429 extern int swap_type_of(dev_t, sector_t, struct block_device **);
430 extern unsigned int count_swap_pages(int, int);
431 extern sector_t map_swap_page(struct page *, struct block_device **);
432 extern sector_t swapdev_block(int, pgoff_t);
433 extern int page_swapcount(struct page *);
434 extern struct swap_info_struct *page_swap_info(struct page *);
435 extern int reuse_swap_page(struct page *);
436 extern int try_to_free_swap(struct page *);
437 struct backing_dev_info;
438 
439 #else /* CONFIG_SWAP */
440 
441 #define swap_address_space(entry)               (NULL)
442 #define get_nr_swap_pages()                     0L
443 #define total_swap_pages                        0L
444 #define total_swapcache_pages()                 0UL
445 #define vm_swap_full()                          0
446 
447 #define si_swapinfo(val) \
448         do { (val)->freeswap = (val)->totalswap = 0; } while (0)
449 /* only sparc can not include linux/pagemap.h in this file
450  * so leave page_cache_release and release_pages undeclared... */
451 #define free_page_and_swap_cache(page) \
452         page_cache_release(page)
453 #define free_pages_and_swap_cache(pages, nr) \
454         release_pages((pages), (nr), false);
455 
456 static inline void show_swap_cache_info(void)
457 {
458 }
459 
460 #define free_swap_and_cache(swp)        is_migration_entry(swp)
461 #define swapcache_prepare(swp)          is_migration_entry(swp)
462 
463 static inline int add_swap_count_continuation(swp_entry_t swp, gfp_t gfp_mask)
464 {
465         return 0;
466 }
467 
468 static inline void swap_shmem_alloc(swp_entry_t swp)
469 {
470 }
471 
472 static inline int swap_duplicate(swp_entry_t swp)
473 {
474         return 0;
475 }
476 
477 static inline void swap_free(swp_entry_t swp)
478 {
479 }
480 
481 static inline void swapcache_free(swp_entry_t swp)
482 {
483 }
484 
485 static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
486                         struct vm_area_struct *vma, unsigned long addr)
487 {
488         return NULL;
489 }
490 
491 static inline int swap_writepage(struct page *p, struct writeback_control *wbc)
492 {
493         return 0;
494 }
495 
496 static inline struct page *lookup_swap_cache(swp_entry_t swp)
497 {
498         return NULL;
499 }
500 
501 static inline int add_to_swap(struct page *page, struct list_head *list)
502 {
503         return 0;
504 }
505 
506 static inline int add_to_swap_cache(struct page *page, swp_entry_t entry,
507                                                         gfp_t gfp_mask)
508 {
509         return -1;
510 }
511 
512 static inline void __delete_from_swap_cache(struct page *page)
513 {
514 }
515 
516 static inline void delete_from_swap_cache(struct page *page)
517 {
518 }
519 
520 static inline int page_swapcount(struct page *page)
521 {
522         return 0;
523 }
524 
525 #define reuse_swap_page(page)   (page_mapcount(page) == 1)
526 
527 static inline int try_to_free_swap(struct page *page)
528 {
529         return 0;
530 }
531 
532 static inline swp_entry_t get_swap_page(void)
533 {
534         swp_entry_t entry;
535         entry.val = 0;
536         return entry;
537 }
538 
539 #endif /* CONFIG_SWAP */
540 #endif /* __KERNEL__*/
541 #endif /* _LINUX_SWAP_H */
542 

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