1
2
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5
6
7#include <linux/fs.h>
8#include <linux/mm.h>
9#include <linux/dcache.h>
10#include <linux/init.h>
11#include <linux/slab.h>
12#include <linux/writeback.h>
13#include <linux/module.h>
14#include <linux/backing-dev.h>
15#include <linux/wait.h>
16#include <linux/rwsem.h>
17#include <linux/hash.h>
18#include <linux/swap.h>
19#include <linux/security.h>
20#include <linux/pagemap.h>
21#include <linux/cdev.h>
22#include <linux/bootmem.h>
23#include <linux/fsnotify.h>
24#include <linux/mount.h>
25#include <linux/async.h>
26#include <linux/posix_acl.h>
27#include <linux/ima.h>
28
29
30
31
32
33
34
35
36#include <linux/buffer_head.h>
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57#define I_HASHBITS i_hash_shift
58#define I_HASHMASK i_hash_mask
59
60static unsigned int i_hash_mask __read_mostly;
61static unsigned int i_hash_shift __read_mostly;
62
63
64
65
66
67
68
69
70
71
72
73
74
75static LIST_HEAD(inode_lru);
76static struct hlist_head *inode_hashtable __read_mostly;
77
78
79
80
81
82
83
84DEFINE_SPINLOCK(inode_lock);
85
86
87
88
89
90
91
92
93
94
95
96
97
98static DECLARE_RWSEM(iprune_sem);
99
100
101
102
103struct inodes_stat_t inodes_stat;
104
105static DEFINE_PER_CPU(unsigned int, nr_inodes);
106
107static struct kmem_cache *inode_cachep __read_mostly;
108
109static int get_nr_inodes(void)
110{
111 int i;
112 int sum = 0;
113 for_each_possible_cpu(i)
114 sum += per_cpu(nr_inodes, i);
115 return sum < 0 ? 0 : sum;
116}
117
118static inline int get_nr_inodes_unused(void)
119{
120 return inodes_stat.nr_unused;
121}
122
123int get_nr_dirty_inodes(void)
124{
125
126 int nr_dirty = get_nr_inodes() - get_nr_inodes_unused();
127 return nr_dirty > 0 ? nr_dirty : 0;
128}
129
130
131
132
133#ifdef CONFIG_SYSCTL
134int proc_nr_inodes(ctl_table *table, int write,
135 void __user *buffer, size_t *lenp, loff_t *ppos)
136{
137 inodes_stat.nr_inodes = get_nr_inodes();
138 return proc_dointvec(table, write, buffer, lenp, ppos);
139}
140#endif
141
142static void wake_up_inode(struct inode *inode)
143{
144
145
146
147 smp_mb();
148 wake_up_bit(&inode->i_state, __I_NEW);
149}
150
151
152
153
154
155
156
157
158
159int inode_init_always(struct super_block *sb, struct inode *inode)
160{
161 static const struct address_space_operations empty_aops;
162 static const struct inode_operations empty_iops;
163 static const struct file_operations empty_fops;
164 struct address_space *const mapping = &inode->i_data;
165
166 inode->i_sb = sb;
167 inode->i_blkbits = sb->s_blocksize_bits;
168 inode->i_flags = 0;
169 atomic_set(&inode->i_count, 1);
170 inode->i_op = &empty_iops;
171 inode->i_fop = &empty_fops;
172 inode->i_nlink = 1;
173 inode->i_uid = 0;
174 inode->i_gid = 0;
175 atomic_set(&inode->i_writecount, 0);
176 inode->i_size = 0;
177 inode->i_blocks = 0;
178 inode->i_bytes = 0;
179 inode->i_generation = 0;
180#ifdef CONFIG_QUOTA
181 memset(&inode->i_dquot, 0, sizeof(inode->i_dquot));
182#endif
183 inode->i_pipe = NULL;
184 inode->i_bdev = NULL;
185 inode->i_cdev = NULL;
186 inode->i_rdev = 0;
187 inode->dirtied_when = 0;
188
189 if (security_inode_alloc(inode))
190 goto out;
191 spin_lock_init(&inode->i_lock);
192 lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key);
193
194 mutex_init(&inode->i_mutex);
195 lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_key);
196
197 init_rwsem(&inode->i_alloc_sem);
198 lockdep_set_class(&inode->i_alloc_sem, &sb->s_type->i_alloc_sem_key);
199
200 mapping->a_ops = &empty_aops;
201 mapping->host = inode;
202 mapping->flags = 0;
203 mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE);
204 mapping->assoc_mapping = NULL;
205 mapping->backing_dev_info = &default_backing_dev_info;
206 mapping->writeback_index = 0;
207
208
209
210
211
212
213 if (sb->s_bdev) {
214 struct backing_dev_info *bdi;
215
216 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
217 mapping->backing_dev_info = bdi;
218 }
219 inode->i_private = NULL;
220 inode->i_mapping = mapping;
221#ifdef CONFIG_FS_POSIX_ACL
222 inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED;
223#endif
224
225#ifdef CONFIG_FSNOTIFY
226 inode->i_fsnotify_mask = 0;
227#endif
228
229 this_cpu_inc(nr_inodes);
230
231 return 0;
232out:
233 return -ENOMEM;
234}
235EXPORT_SYMBOL(inode_init_always);
236
237static struct inode *alloc_inode(struct super_block *sb)
238{
239 struct inode *inode;
240
241 if (sb->s_op->alloc_inode)
242 inode = sb->s_op->alloc_inode(sb);
243 else
244 inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL);
245
246 if (!inode)
247 return NULL;
248
249 if (unlikely(inode_init_always(sb, inode))) {
250 if (inode->i_sb->s_op->destroy_inode)
251 inode->i_sb->s_op->destroy_inode(inode);
252 else
253 kmem_cache_free(inode_cachep, inode);
254 return NULL;
255 }
256
257 return inode;
258}
259
260void free_inode_nonrcu(struct inode *inode)
261{
262 kmem_cache_free(inode_cachep, inode);
263}
264EXPORT_SYMBOL(free_inode_nonrcu);
265
266void __destroy_inode(struct inode *inode)
267{
268 BUG_ON(inode_has_buffers(inode));
269 security_inode_free(inode);
270 fsnotify_inode_delete(inode);
271#ifdef CONFIG_FS_POSIX_ACL
272 if (inode->i_acl && inode->i_acl != ACL_NOT_CACHED)
273 posix_acl_release(inode->i_acl);
274 if (inode->i_default_acl && inode->i_default_acl != ACL_NOT_CACHED)
275 posix_acl_release(inode->i_default_acl);
276#endif
277 this_cpu_dec(nr_inodes);
278}
279EXPORT_SYMBOL(__destroy_inode);
280
281static void i_callback(struct rcu_head *head)
282{
283 struct inode *inode = container_of(head, struct inode, i_rcu);
284 INIT_LIST_HEAD(&inode->i_dentry);
285 kmem_cache_free(inode_cachep, inode);
286}
287
288static void destroy_inode(struct inode *inode)
289{
290 BUG_ON(!list_empty(&inode->i_lru));
291 __destroy_inode(inode);
292 if (inode->i_sb->s_op->destroy_inode)
293 inode->i_sb->s_op->destroy_inode(inode);
294 else
295 call_rcu(&inode->i_rcu, i_callback);
296}
297
298void address_space_init_once(struct address_space *mapping)
299{
300 memset(mapping, 0, sizeof(*mapping));
301 INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC);
302 spin_lock_init(&mapping->tree_lock);
303 spin_lock_init(&mapping->i_mmap_lock);
304 INIT_LIST_HEAD(&mapping->private_list);
305 spin_lock_init(&mapping->private_lock);
306 INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap);
307 INIT_LIST_HEAD(&mapping->i_mmap_nonlinear);
308 mutex_init(&mapping->unmap_mutex);
309}
310EXPORT_SYMBOL(address_space_init_once);
311
312
313
314
315
316
317void inode_init_once(struct inode *inode)
318{
319 memset(inode, 0, sizeof(*inode));
320 INIT_HLIST_NODE(&inode->i_hash);
321 INIT_LIST_HEAD(&inode->i_dentry);
322 INIT_LIST_HEAD(&inode->i_devices);
323 INIT_LIST_HEAD(&inode->i_wb_list);
324 INIT_LIST_HEAD(&inode->i_lru);
325 address_space_init_once(&inode->i_data);
326 i_size_ordered_init(inode);
327#ifdef CONFIG_FSNOTIFY
328 INIT_HLIST_HEAD(&inode->i_fsnotify_marks);
329#endif
330}
331EXPORT_SYMBOL(inode_init_once);
332
333static void init_once(void *foo)
334{
335 struct inode *inode = (struct inode *) foo;
336
337 inode_init_once(inode);
338}
339
340
341
342
343void __iget(struct inode *inode)
344{
345 atomic_inc(&inode->i_count);
346}
347
348
349
350
351void ihold(struct inode *inode)
352{
353 WARN_ON(atomic_inc_return(&inode->i_count) < 2);
354}
355EXPORT_SYMBOL(ihold);
356
357static void inode_lru_list_add(struct inode *inode)
358{
359 if (list_empty(&inode->i_lru)) {
360 list_add(&inode->i_lru, &inode_lru);
361 inodes_stat.nr_unused++;
362 }
363}
364
365static void inode_lru_list_del(struct inode *inode)
366{
367 if (!list_empty(&inode->i_lru)) {
368 list_del_init(&inode->i_lru);
369 inodes_stat.nr_unused--;
370 }
371}
372
373static inline void __inode_sb_list_add(struct inode *inode)
374{
375 list_add(&inode->i_sb_list, &inode->i_sb->s_inodes);
376}
377
378
379
380
381
382void inode_sb_list_add(struct inode *inode)
383{
384 spin_lock(&inode_lock);
385 __inode_sb_list_add(inode);
386 spin_unlock(&inode_lock);
387}
388EXPORT_SYMBOL_GPL(inode_sb_list_add);
389
390static inline void __inode_sb_list_del(struct inode *inode)
391{
392 list_del_init(&inode->i_sb_list);
393}
394
395static unsigned long hash(struct super_block *sb, unsigned long hashval)
396{
397 unsigned long tmp;
398
399 tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) /
400 L1_CACHE_BYTES;
401 tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> I_HASHBITS);
402 return tmp & I_HASHMASK;
403}
404
405
406
407
408
409
410
411
412
413void __insert_inode_hash(struct inode *inode, unsigned long hashval)
414{
415 struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval);
416
417 spin_lock(&inode_lock);
418 hlist_add_head(&inode->i_hash, b);
419 spin_unlock(&inode_lock);
420}
421EXPORT_SYMBOL(__insert_inode_hash);
422
423
424
425
426
427
428
429static void __remove_inode_hash(struct inode *inode)
430{
431 hlist_del_init(&inode->i_hash);
432}
433
434
435
436
437
438
439
440void remove_inode_hash(struct inode *inode)
441{
442 spin_lock(&inode_lock);
443 hlist_del_init(&inode->i_hash);
444 spin_unlock(&inode_lock);
445}
446EXPORT_SYMBOL(remove_inode_hash);
447
448void end_writeback(struct inode *inode)
449{
450 might_sleep();
451 BUG_ON(inode->i_data.nrpages);
452 BUG_ON(!list_empty(&inode->i_data.private_list));
453 BUG_ON(!(inode->i_state & I_FREEING));
454 BUG_ON(inode->i_state & I_CLEAR);
455 inode_sync_wait(inode);
456
457 inode->i_state = I_FREEING | I_CLEAR;
458}
459EXPORT_SYMBOL(end_writeback);
460
461static void evict(struct inode *inode)
462{
463 const struct super_operations *op = inode->i_sb->s_op;
464
465 if (op->evict_inode) {
466 op->evict_inode(inode);
467 } else {
468 if (inode->i_data.nrpages)
469 truncate_inode_pages(&inode->i_data, 0);
470 end_writeback(inode);
471 }
472 if (S_ISBLK(inode->i_mode) && inode->i_bdev)
473 bd_forget(inode);
474 if (S_ISCHR(inode->i_mode) && inode->i_cdev)
475 cd_forget(inode);
476}
477
478
479
480
481
482
483
484
485static void dispose_list(struct list_head *head)
486{
487 while (!list_empty(head)) {
488 struct inode *inode;
489
490 inode = list_first_entry(head, struct inode, i_lru);
491 list_del_init(&inode->i_lru);
492
493 evict(inode);
494
495 spin_lock(&inode_lock);
496 __remove_inode_hash(inode);
497 __inode_sb_list_del(inode);
498 spin_unlock(&inode_lock);
499
500 wake_up_inode(inode);
501 destroy_inode(inode);
502 }
503}
504
505
506
507
508
509
510
511
512
513
514void evict_inodes(struct super_block *sb)
515{
516 struct inode *inode, *next;
517 LIST_HEAD(dispose);
518
519 down_write(&iprune_sem);
520
521 spin_lock(&inode_lock);
522 list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
523 if (atomic_read(&inode->i_count))
524 continue;
525
526 if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) {
527 WARN_ON(1);
528 continue;
529 }
530
531 inode->i_state |= I_FREEING;
532
533
534
535
536
537 list_move(&inode->i_lru, &dispose);
538 list_del_init(&inode->i_wb_list);
539 if (!(inode->i_state & (I_DIRTY | I_SYNC)))
540 inodes_stat.nr_unused--;
541 }
542 spin_unlock(&inode_lock);
543
544 dispose_list(&dispose);
545 up_write(&iprune_sem);
546}
547
548
549
550
551
552
553
554
555
556
557
558int invalidate_inodes(struct super_block *sb, bool kill_dirty)
559{
560 int busy = 0;
561 struct inode *inode, *next;
562 LIST_HEAD(dispose);
563
564 down_write(&iprune_sem);
565
566 spin_lock(&inode_lock);
567 list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) {
568 if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE))
569 continue;
570 if (inode->i_state & I_DIRTY && !kill_dirty) {
571 busy = 1;
572 continue;
573 }
574 if (atomic_read(&inode->i_count)) {
575 busy = 1;
576 continue;
577 }
578
579 inode->i_state |= I_FREEING;
580
581
582
583
584
585 list_move(&inode->i_lru, &dispose);
586 list_del_init(&inode->i_wb_list);
587 if (!(inode->i_state & (I_DIRTY | I_SYNC)))
588 inodes_stat.nr_unused--;
589 }
590 spin_unlock(&inode_lock);
591
592 dispose_list(&dispose);
593 up_write(&iprune_sem);
594
595 return busy;
596}
597
598static int can_unuse(struct inode *inode)
599{
600 if (inode->i_state & ~I_REFERENCED)
601 return 0;
602 if (inode_has_buffers(inode))
603 return 0;
604 if (atomic_read(&inode->i_count))
605 return 0;
606 if (inode->i_data.nrpages)
607 return 0;
608 return 1;
609}
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627static void prune_icache(int nr_to_scan)
628{
629 LIST_HEAD(freeable);
630 int nr_scanned;
631 unsigned long reap = 0;
632
633 down_read(&iprune_sem);
634 spin_lock(&inode_lock);
635 for (nr_scanned = 0; nr_scanned < nr_to_scan; nr_scanned++) {
636 struct inode *inode;
637
638 if (list_empty(&inode_lru))
639 break;
640
641 inode = list_entry(inode_lru.prev, struct inode, i_lru);
642
643
644
645
646
647 if (atomic_read(&inode->i_count) ||
648 (inode->i_state & ~I_REFERENCED)) {
649 list_del_init(&inode->i_lru);
650 inodes_stat.nr_unused--;
651 continue;
652 }
653
654
655 if (inode->i_state & I_REFERENCED) {
656 list_move(&inode->i_lru, &inode_lru);
657 inode->i_state &= ~I_REFERENCED;
658 continue;
659 }
660 if (inode_has_buffers(inode) || inode->i_data.nrpages) {
661 __iget(inode);
662 spin_unlock(&inode_lock);
663 if (remove_inode_buffers(inode))
664 reap += invalidate_mapping_pages(&inode->i_data,
665 0, -1);
666 iput(inode);
667 spin_lock(&inode_lock);
668
669 if (inode != list_entry(inode_lru.next,
670 struct inode, i_lru))
671 continue;
672 if (!can_unuse(inode))
673 continue;
674 }
675 WARN_ON(inode->i_state & I_NEW);
676 inode->i_state |= I_FREEING;
677
678
679
680
681
682 list_move(&inode->i_lru, &freeable);
683 list_del_init(&inode->i_wb_list);
684 inodes_stat.nr_unused--;
685 }
686 if (current_is_kswapd())
687 __count_vm_events(KSWAPD_INODESTEAL, reap);
688 else
689 __count_vm_events(PGINODESTEAL, reap);
690 spin_unlock(&inode_lock);
691
692 dispose_list(&freeable);
693 up_read(&iprune_sem);
694}
695
696
697
698
699
700
701
702
703
704
705static int shrink_icache_memory(struct shrinker *shrink, int nr, gfp_t gfp_mask)
706{
707 if (nr) {
708
709
710
711
712
713 if (!(gfp_mask & __GFP_FS))
714 return -1;
715 prune_icache(nr);
716 }
717 return (get_nr_inodes_unused() / 100) * sysctl_vfs_cache_pressure;
718}
719
720static struct shrinker icache_shrinker = {
721 .shrink = shrink_icache_memory,
722 .seeks = DEFAULT_SEEKS,
723};
724
725static void __wait_on_freeing_inode(struct inode *inode);
726
727
728
729static struct inode *find_inode(struct super_block *sb,
730 struct hlist_head *head,
731 int (*test)(struct inode *, void *),
732 void *data)
733{
734 struct hlist_node *node;
735 struct inode *inode = NULL;
736
737repeat:
738 hlist_for_each_entry(inode, node, head, i_hash) {
739 if (inode->i_sb != sb)
740 continue;
741 if (!test(inode, data))
742 continue;
743 if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
744 __wait_on_freeing_inode(inode);
745 goto repeat;
746 }
747 __iget(inode);
748 return inode;
749 }
750 return NULL;
751}
752
753
754
755
756
757static struct inode *find_inode_fast(struct super_block *sb,
758 struct hlist_head *head, unsigned long ino)
759{
760 struct hlist_node *node;
761 struct inode *inode = NULL;
762
763repeat:
764 hlist_for_each_entry(inode, node, head, i_hash) {
765 if (inode->i_ino != ino)
766 continue;
767 if (inode->i_sb != sb)
768 continue;
769 if (inode->i_state & (I_FREEING|I_WILL_FREE)) {
770 __wait_on_freeing_inode(inode);
771 goto repeat;
772 }
773 __iget(inode);
774 return inode;
775 }
776 return NULL;
777}
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794#define LAST_INO_BATCH 1024
795static DEFINE_PER_CPU(unsigned int, last_ino);
796
797unsigned int get_next_ino(void)
798{
799 unsigned int *p = &get_cpu_var(last_ino);
800 unsigned int res = *p;
801
802#ifdef CONFIG_SMP
803 if (unlikely((res & (LAST_INO_BATCH-1)) == 0)) {
804 static atomic_t shared_last_ino;
805 int next = atomic_add_return(LAST_INO_BATCH, &shared_last_ino);
806
807 res = next - LAST_INO_BATCH;
808 }
809#endif
810
811 *p = ++res;
812 put_cpu_var(last_ino);
813 return res;
814}
815EXPORT_SYMBOL(get_next_ino);
816
817
818
819
820
821
822
823
824
825
826
827
828
829struct inode *new_inode(struct super_block *sb)
830{
831 struct inode *inode;
832
833 spin_lock_prefetch(&inode_lock);
834
835 inode = alloc_inode(sb);
836 if (inode) {
837 spin_lock(&inode_lock);
838 __inode_sb_list_add(inode);
839 inode->i_state = 0;
840 spin_unlock(&inode_lock);
841 }
842 return inode;
843}
844EXPORT_SYMBOL(new_inode);
845
846void unlock_new_inode(struct inode *inode)
847{
848#ifdef CONFIG_DEBUG_LOCK_ALLOC
849 if (S_ISDIR(inode->i_mode)) {
850 struct file_system_type *type = inode->i_sb->s_type;
851
852
853 if (!lockdep_match_class(&inode->i_mutex,
854 &type->i_mutex_key)) {
855
856
857
858 mutex_destroy(&inode->i_mutex);
859 mutex_init(&inode->i_mutex);
860 lockdep_set_class(&inode->i_mutex,
861 &type->i_mutex_dir_key);
862 }
863 }
864#endif
865
866
867
868
869
870
871
872
873
874 smp_mb();
875 WARN_ON(!(inode->i_state & I_NEW));
876 inode->i_state &= ~I_NEW;
877 wake_up_inode(inode);
878}
879EXPORT_SYMBOL(unlock_new_inode);
880
881
882
883
884
885
886
887static struct inode *get_new_inode(struct super_block *sb,
888 struct hlist_head *head,
889 int (*test)(struct inode *, void *),
890 int (*set)(struct inode *, void *),
891 void *data)
892{
893 struct inode *inode;
894
895 inode = alloc_inode(sb);
896 if (inode) {
897 struct inode *old;
898
899 spin_lock(&inode_lock);
900
901 old = find_inode(sb, head, test, data);
902 if (!old) {
903 if (set(inode, data))
904 goto set_failed;
905
906 hlist_add_head(&inode->i_hash, head);
907 __inode_sb_list_add(inode);
908 inode->i_state = I_NEW;
909 spin_unlock(&inode_lock);
910
911
912
913
914 return inode;
915 }
916
917
918
919
920
921
922 spin_unlock(&inode_lock);
923 destroy_inode(inode);
924 inode = old;
925 wait_on_inode(inode);
926 }
927 return inode;
928
929set_failed:
930 spin_unlock(&inode_lock);
931 destroy_inode(inode);
932 return NULL;
933}
934
935
936
937
938
939static struct inode *get_new_inode_fast(struct super_block *sb,
940 struct hlist_head *head, unsigned long ino)
941{
942 struct inode *inode;
943
944 inode = alloc_inode(sb);
945 if (inode) {
946 struct inode *old;
947
948 spin_lock(&inode_lock);
949
950 old = find_inode_fast(sb, head, ino);
951 if (!old) {
952 inode->i_ino = ino;
953 hlist_add_head(&inode->i_hash, head);
954 __inode_sb_list_add(inode);
955 inode->i_state = I_NEW;
956 spin_unlock(&inode_lock);
957
958
959
960
961 return inode;
962 }
963
964
965
966
967
968
969 spin_unlock(&inode_lock);
970 destroy_inode(inode);
971 inode = old;
972 wait_on_inode(inode);
973 }
974 return inode;
975}
976
977
978
979
980
981
982
983
984static int test_inode_iunique(struct super_block *sb, unsigned long ino)
985{
986 struct hlist_head *b = inode_hashtable + hash(sb, ino);
987 struct hlist_node *node;
988 struct inode *inode;
989
990 hlist_for_each_entry(inode, node, b, i_hash) {
991 if (inode->i_ino == ino && inode->i_sb == sb)
992 return 0;
993 }
994
995 return 1;
996}
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012ino_t iunique(struct super_block *sb, ino_t max_reserved)
1013{
1014
1015
1016
1017
1018
1019 static DEFINE_SPINLOCK(iunique_lock);
1020 static unsigned int counter;
1021 ino_t res;
1022
1023 spin_lock(&inode_lock);
1024 spin_lock(&iunique_lock);
1025 do {
1026 if (counter <= max_reserved)
1027 counter = max_reserved + 1;
1028 res = counter++;
1029 } while (!test_inode_iunique(sb, res));
1030 spin_unlock(&iunique_lock);
1031 spin_unlock(&inode_lock);
1032
1033 return res;
1034}
1035EXPORT_SYMBOL(iunique);
1036
1037struct inode *igrab(struct inode *inode)
1038{
1039 spin_lock(&inode_lock);
1040 if (!(inode->i_state & (I_FREEING|I_WILL_FREE)))
1041 __iget(inode);
1042 else
1043
1044
1045
1046
1047
1048 inode = NULL;
1049 spin_unlock(&inode_lock);
1050 return inode;
1051}
1052EXPORT_SYMBOL(igrab);
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073static struct inode *ifind(struct super_block *sb,
1074 struct hlist_head *head, int (*test)(struct inode *, void *),
1075 void *data, const int wait)
1076{
1077 struct inode *inode;
1078
1079 spin_lock(&inode_lock);
1080 inode = find_inode(sb, head, test, data);
1081 if (inode) {
1082 spin_unlock(&inode_lock);
1083 if (likely(wait))
1084 wait_on_inode(inode);
1085 return inode;
1086 }
1087 spin_unlock(&inode_lock);
1088 return NULL;
1089}
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106static struct inode *ifind_fast(struct super_block *sb,
1107 struct hlist_head *head, unsigned long ino)
1108{
1109 struct inode *inode;
1110
1111 spin_lock(&inode_lock);
1112 inode = find_inode_fast(sb, head, ino);
1113 if (inode) {
1114 spin_unlock(&inode_lock);
1115 wait_on_inode(inode);
1116 return inode;
1117 }
1118 spin_unlock(&inode_lock);
1119 return NULL;
1120}
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval,
1144 int (*test)(struct inode *, void *), void *data)
1145{
1146 struct hlist_head *head = inode_hashtable + hash(sb, hashval);
1147
1148 return ifind(sb, head, test, data, 0);
1149}
1150EXPORT_SYMBOL(ilookup5_nowait);
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171struct inode *ilookup5(struct super_block *sb, unsigned long hashval,
1172 int (*test)(struct inode *, void *), void *data)
1173{
1174 struct hlist_head *head = inode_hashtable + hash(sb, hashval);
1175
1176 return ifind(sb, head, test, data, 1);
1177}
1178EXPORT_SYMBOL(ilookup5);
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194struct inode *ilookup(struct super_block *sb, unsigned long ino)
1195{
1196 struct hlist_head *head = inode_hashtable + hash(sb, ino);
1197
1198 return ifind_fast(sb, head, ino);
1199}
1200EXPORT_SYMBOL(ilookup);
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222struct inode *iget5_locked(struct super_block *sb, unsigned long hashval,
1223 int (*test)(struct inode *, void *),
1224 int (*set)(struct inode *, void *), void *data)
1225{
1226 struct hlist_head *head = inode_hashtable + hash(sb, hashval);
1227 struct inode *inode;
1228
1229 inode = ifind(sb, head, test, data, 1);
1230 if (inode)
1231 return inode;
1232
1233
1234
1235
1236 return get_new_inode(sb, head, test, set, data);
1237}
1238EXPORT_SYMBOL(iget5_locked);
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255struct inode *iget_locked(struct super_block *sb, unsigned long ino)
1256{
1257 struct hlist_head *head = inode_hashtable + hash(sb, ino);
1258 struct inode *inode;
1259
1260 inode = ifind_fast(sb, head, ino);
1261 if (inode)
1262 return inode;
1263
1264
1265
1266
1267 return get_new_inode_fast(sb, head, ino);
1268}
1269EXPORT_SYMBOL(iget_locked);
1270
1271int insert_inode_locked(struct inode *inode)
1272{
1273 struct super_block *sb = inode->i_sb;
1274 ino_t ino = inode->i_ino;
1275 struct hlist_head *head = inode_hashtable + hash(sb, ino);
1276
1277 inode->i_state |= I_NEW;
1278 while (1) {
1279 struct hlist_node *node;
1280 struct inode *old = NULL;
1281 spin_lock(&inode_lock);
1282 hlist_for_each_entry(old, node, head, i_hash) {
1283 if (old->i_ino != ino)
1284 continue;
1285 if (old->i_sb != sb)
1286 continue;
1287 if (old->i_state & (I_FREEING|I_WILL_FREE))
1288 continue;
1289 break;
1290 }
1291 if (likely(!node)) {
1292 hlist_add_head(&inode->i_hash, head);
1293 spin_unlock(&inode_lock);
1294 return 0;
1295 }
1296 __iget(old);
1297 spin_unlock(&inode_lock);
1298 wait_on_inode(old);
1299 if (unlikely(!inode_unhashed(old))) {
1300 iput(old);
1301 return -EBUSY;
1302 }
1303 iput(old);
1304 }
1305}
1306EXPORT_SYMBOL(insert_inode_locked);
1307
1308int insert_inode_locked4(struct inode *inode, unsigned long hashval,
1309 int (*test)(struct inode *, void *), void *data)
1310{
1311 struct super_block *sb = inode->i_sb;
1312 struct hlist_head *head = inode_hashtable + hash(sb, hashval);
1313
1314 inode->i_state |= I_NEW;
1315
1316 while (1) {
1317 struct hlist_node *node;
1318 struct inode *old = NULL;
1319
1320 spin_lock(&inode_lock);
1321 hlist_for_each_entry(old, node, head, i_hash) {
1322 if (old->i_sb != sb)
1323 continue;
1324 if (!test(old, data))
1325 continue;
1326 if (old->i_state & (I_FREEING|I_WILL_FREE))
1327 continue;
1328 break;
1329 }
1330 if (likely(!node)) {
1331 hlist_add_head(&inode->i_hash, head);
1332 spin_unlock(&inode_lock);
1333 return 0;
1334 }
1335 __iget(old);
1336 spin_unlock(&inode_lock);
1337 wait_on_inode(old);
1338 if (unlikely(!inode_unhashed(old))) {
1339 iput(old);
1340 return -EBUSY;
1341 }
1342 iput(old);
1343 }
1344}
1345EXPORT_SYMBOL(insert_inode_locked4);
1346
1347
1348int generic_delete_inode(struct inode *inode)
1349{
1350 return 1;
1351}
1352EXPORT_SYMBOL(generic_delete_inode);
1353
1354
1355
1356
1357
1358
1359int generic_drop_inode(struct inode *inode)
1360{
1361 return !inode->i_nlink || inode_unhashed(inode);
1362}
1363EXPORT_SYMBOL_GPL(generic_drop_inode);
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375static void iput_final(struct inode *inode)
1376{
1377 struct super_block *sb = inode->i_sb;
1378 const struct super_operations *op = inode->i_sb->s_op;
1379 int drop;
1380
1381 if (op && op->drop_inode)
1382 drop = op->drop_inode(inode);
1383 else
1384 drop = generic_drop_inode(inode);
1385
1386 if (!drop) {
1387 if (sb->s_flags & MS_ACTIVE) {
1388 inode->i_state |= I_REFERENCED;
1389 if (!(inode->i_state & (I_DIRTY|I_SYNC))) {
1390 inode_lru_list_add(inode);
1391 }
1392 spin_unlock(&inode_lock);
1393 return;
1394 }
1395 WARN_ON(inode->i_state & I_NEW);
1396 inode->i_state |= I_WILL_FREE;
1397 spin_unlock(&inode_lock);
1398 write_inode_now(inode, 1);
1399 spin_lock(&inode_lock);
1400 WARN_ON(inode->i_state & I_NEW);
1401 inode->i_state &= ~I_WILL_FREE;
1402 __remove_inode_hash(inode);
1403 }
1404
1405 WARN_ON(inode->i_state & I_NEW);
1406 inode->i_state |= I_FREEING;
1407
1408
1409
1410
1411
1412 inode_lru_list_del(inode);
1413 list_del_init(&inode->i_wb_list);
1414
1415 __inode_sb_list_del(inode);
1416 spin_unlock(&inode_lock);
1417 evict(inode);
1418 remove_inode_hash(inode);
1419 wake_up_inode(inode);
1420 BUG_ON(inode->i_state != (I_FREEING | I_CLEAR));
1421 destroy_inode(inode);
1422}
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433void iput(struct inode *inode)
1434{
1435 if (inode) {
1436 BUG_ON(inode->i_state & I_CLEAR);
1437
1438 if (atomic_dec_and_lock(&inode->i_count, &inode_lock))
1439 iput_final(inode);
1440 }
1441}
1442EXPORT_SYMBOL(iput);
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455sector_t bmap(struct inode *inode, sector_t block)
1456{
1457 sector_t res = 0;
1458 if (inode->i_mapping->a_ops->bmap)
1459 res = inode->i_mapping->a_ops->bmap(inode->i_mapping, block);
1460 return res;
1461}
1462EXPORT_SYMBOL(bmap);
1463
1464
1465
1466
1467
1468
1469static int relatime_need_update(struct vfsmount *mnt, struct inode *inode,
1470 struct timespec now)
1471{
1472
1473 if (!(mnt->mnt_flags & MNT_RELATIME))
1474 return 1;
1475
1476
1477
1478 if (timespec_compare(&inode->i_mtime, &inode->i_atime) >= 0)
1479 return 1;
1480
1481
1482
1483 if (timespec_compare(&inode->i_ctime, &inode->i_atime) >= 0)
1484 return 1;
1485
1486
1487
1488
1489
1490 if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60)
1491 return 1;
1492
1493
1494
1495 return 0;
1496}
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507void touch_atime(struct vfsmount *mnt, struct dentry *dentry)
1508{
1509 struct inode *inode = dentry->d_inode;
1510 struct timespec now;
1511
1512 if (inode->i_flags & S_NOATIME)
1513 return;
1514 if (IS_NOATIME(inode))
1515 return;
1516 if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode))
1517 return;
1518
1519 if (mnt->mnt_flags & MNT_NOATIME)
1520 return;
1521 if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode))
1522 return;
1523
1524 now = current_fs_time(inode->i_sb);
1525
1526 if (!relatime_need_update(mnt, inode, now))
1527 return;
1528
1529 if (timespec_equal(&inode->i_atime, &now))
1530 return;
1531
1532 if (mnt_want_write(mnt))
1533 return;
1534
1535 inode->i_atime = now;
1536 mark_inode_dirty_sync(inode);
1537 mnt_drop_write(mnt);
1538}
1539EXPORT_SYMBOL(touch_atime);
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553void file_update_time(struct file *file)
1554{
1555 struct inode *inode = file->f_path.dentry->d_inode;
1556 struct timespec now;
1557 enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0;
1558
1559
1560 if (IS_NOCMTIME(inode))
1561 return;
1562
1563 now = current_fs_time(inode->i_sb);
1564 if (!timespec_equal(&inode->i_mtime, &now))
1565 sync_it = S_MTIME;
1566
1567 if (!timespec_equal(&inode->i_ctime, &now))
1568 sync_it |= S_CTIME;
1569
1570 if (IS_I_VERSION(inode))
1571 sync_it |= S_VERSION;
1572
1573 if (!sync_it)
1574 return;
1575
1576
1577 if (mnt_want_write_file(file))
1578 return;
1579
1580
1581 if (sync_it & S_VERSION)
1582 inode_inc_iversion(inode);
1583 if (sync_it & S_CTIME)
1584 inode->i_ctime = now;
1585 if (sync_it & S_MTIME)
1586 inode->i_mtime = now;
1587 mark_inode_dirty_sync(inode);
1588 mnt_drop_write(file->f_path.mnt);
1589}
1590EXPORT_SYMBOL(file_update_time);
1591
1592int inode_needs_sync(struct inode *inode)
1593{
1594 if (IS_SYNC(inode))
1595 return 1;
1596 if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode))
1597 return 1;
1598 return 0;
1599}
1600EXPORT_SYMBOL(inode_needs_sync);
1601
1602int inode_wait(void *word)
1603{
1604 schedule();
1605 return 0;
1606}
1607EXPORT_SYMBOL(inode_wait);
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621static void __wait_on_freeing_inode(struct inode *inode)
1622{
1623 wait_queue_head_t *wq;
1624 DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW);
1625 wq = bit_waitqueue(&inode->i_state, __I_NEW);
1626 prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
1627 spin_unlock(&inode_lock);
1628 schedule();
1629 finish_wait(wq, &wait.wait);
1630 spin_lock(&inode_lock);
1631}
1632
1633static __initdata unsigned long ihash_entries;
1634static int __init set_ihash_entries(char *str)
1635{
1636 if (!str)
1637 return 0;
1638 ihash_entries = simple_strtoul(str, &str, 0);
1639 return 1;
1640}
1641__setup("ihash_entries=", set_ihash_entries);
1642
1643
1644
1645
1646void __init inode_init_early(void)
1647{
1648 int loop;
1649
1650
1651
1652
1653 if (hashdist)
1654 return;
1655
1656 inode_hashtable =
1657 alloc_large_system_hash("Inode-cache",
1658 sizeof(struct hlist_head),
1659 ihash_entries,
1660 14,
1661 HASH_EARLY,
1662 &i_hash_shift,
1663 &i_hash_mask,
1664 0);
1665
1666 for (loop = 0; loop < (1 << i_hash_shift); loop++)
1667 INIT_HLIST_HEAD(&inode_hashtable[loop]);
1668}
1669
1670void __init inode_init(void)
1671{
1672 int loop;
1673
1674
1675 inode_cachep = kmem_cache_create("inode_cache",
1676 sizeof(struct inode),
1677 0,
1678 (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|
1679 SLAB_MEM_SPREAD),
1680 init_once);
1681 register_shrinker(&icache_shrinker);
1682
1683
1684 if (!hashdist)
1685 return;
1686
1687 inode_hashtable =
1688 alloc_large_system_hash("Inode-cache",
1689 sizeof(struct hlist_head),
1690 ihash_entries,
1691 14,
1692 0,
1693 &i_hash_shift,
1694 &i_hash_mask,
1695 0);
1696
1697 for (loop = 0; loop < (1 << i_hash_shift); loop++)
1698 INIT_HLIST_HEAD(&inode_hashtable[loop]);
1699}
1700
1701void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev)
1702{
1703 inode->i_mode = mode;
1704 if (S_ISCHR(mode)) {
1705 inode->i_fop = &def_chr_fops;
1706 inode->i_rdev = rdev;
1707 } else if (S_ISBLK(mode)) {
1708 inode->i_fop = &def_blk_fops;
1709 inode->i_rdev = rdev;
1710 } else if (S_ISFIFO(mode))
1711 inode->i_fop = &def_fifo_fops;
1712 else if (S_ISSOCK(mode))
1713 inode->i_fop = &bad_sock_fops;
1714 else
1715 printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for"
1716 " inode %s:%lu\n", mode, inode->i_sb->s_id,
1717 inode->i_ino);
1718}
1719EXPORT_SYMBOL(init_special_inode);
1720
1721
1722
1723
1724
1725
1726
1727void inode_init_owner(struct inode *inode, const struct inode *dir,
1728 mode_t mode)
1729{
1730 inode->i_uid = current_fsuid();
1731 if (dir && dir->i_mode & S_ISGID) {
1732 inode->i_gid = dir->i_gid;
1733 if (S_ISDIR(mode))
1734 mode |= S_ISGID;
1735 } else
1736 inode->i_gid = current_fsgid();
1737 inode->i_mode = mode;
1738}
1739EXPORT_SYMBOL(inode_init_owner);
1740