1#ifndef __SHMEM_FS_H
2#define __SHMEM_FS_H
3
4#include <linux/file.h>
5#include <linux/swap.h>
6#include <linux/mempolicy.h>
7#include <linux/pagemap.h>
8#include <linux/percpu_counter.h>
9#include <linux/xattr.h>
10
11
12
13struct shmem_inode_info {
14 spinlock_t lock;
15 unsigned int seals;
16 unsigned long flags;
17 unsigned long alloced;
18 unsigned long swapped;
19 struct shared_policy policy;
20 struct list_head swaplist;
21 struct simple_xattrs xattrs;
22 struct inode vfs_inode;
23};
24
25struct shmem_sb_info {
26 unsigned long max_blocks;
27 struct percpu_counter used_blocks;
28 unsigned long max_inodes;
29 unsigned long free_inodes;
30 spinlock_t stat_lock;
31 kuid_t uid;
32 kgid_t gid;
33 umode_t mode;
34 struct mempolicy *mpol;
35};
36
37static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
38{
39 return container_of(inode, struct shmem_inode_info, vfs_inode);
40}
41
42
43
44
45extern int shmem_init(void);
46extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
47extern struct file *shmem_file_setup(const char *name,
48 loff_t size, unsigned long flags);
49extern struct file *shmem_kernel_file_setup(const char *name, loff_t size,
50 unsigned long flags);
51extern int shmem_zero_setup(struct vm_area_struct *);
52extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
53extern bool shmem_mapping(struct address_space *mapping);
54extern void shmem_unlock_mapping(struct address_space *mapping);
55extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
56 pgoff_t index, gfp_t gfp_mask);
57extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
58extern int shmem_unuse(swp_entry_t entry, struct page *page);
59
60extern unsigned long shmem_swap_usage(struct vm_area_struct *vma);
61extern unsigned long shmem_partial_swap_usage(struct address_space *mapping,
62 pgoff_t start, pgoff_t end);
63
64static inline struct page *shmem_read_mapping_page(
65 struct address_space *mapping, pgoff_t index)
66{
67 return shmem_read_mapping_page_gfp(mapping, index,
68 mapping_gfp_mask(mapping));
69}
70
71#ifdef CONFIG_TMPFS
72
73extern int shmem_add_seals(struct file *file, unsigned int seals);
74extern int shmem_get_seals(struct file *file);
75extern long shmem_fcntl(struct file *file, unsigned int cmd, unsigned long arg);
76
77#else
78
79static inline long shmem_fcntl(struct file *f, unsigned int c, unsigned long a)
80{
81 return -EINVAL;
82}
83
84#endif
85
86#endif
87