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