1#ifndef __SHMEM_FS_H
2#define __SHMEM_FS_H
3
4#include <linux/swap.h>
5#include <linux/mempolicy.h>
6#include <linux/pagemap.h>
7#include <linux/percpu_counter.h>
8#include <linux/xattr.h>
9
10
11
12struct shmem_inode_info {
13 spinlock_t lock;
14 unsigned long flags;
15 unsigned long alloced;
16 union {
17 unsigned long swapped;
18 char *symlink;
19 };
20 struct shared_policy policy;
21 struct list_head swaplist;
22 struct simple_xattrs xattrs;
23 struct inode vfs_inode;
24};
25
26struct shmem_sb_info {
27 unsigned long max_blocks;
28 struct percpu_counter used_blocks;
29 unsigned long max_inodes;
30 unsigned long free_inodes;
31 spinlock_t stat_lock;
32 kuid_t uid;
33 kgid_t gid;
34 umode_t mode;
35 struct mempolicy *mpol;
36};
37
38static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
39{
40 return container_of(inode, struct shmem_inode_info, vfs_inode);
41}
42
43
44
45
46extern int shmem_init(void);
47extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
48extern struct file *shmem_file_setup(const char *name,
49 loff_t size, unsigned long flags);
50extern int shmem_zero_setup(struct vm_area_struct *);
51extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
52extern void shmem_unlock_mapping(struct address_space *mapping);
53extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
54 pgoff_t index, gfp_t gfp_mask);
55extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
56extern int shmem_unuse(swp_entry_t entry, struct page *page);
57
58static inline struct page *shmem_read_mapping_page(
59 struct address_space *mapping, pgoff_t index)
60{
61 return shmem_read_mapping_page_gfp(mapping, index,
62 mapping_gfp_mask(mapping));
63}
64
65#endif
66