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#ifndef __SHMEM_FS_H
#define __SHMEM_FS_H
#include <linux/swap.h>
#include <linux/mempolicy.h>
#include <linux/pagemap.h>
#include <linux/percpu_counter.h>
struct shmem_inode_info {
spinlock_t lock;
unsigned long flags;
unsigned long alloced;
union {
unsigned long swapped;
char *symlink;
};
struct shared_policy policy;
struct list_head swaplist;
struct list_head xattr_list;
struct inode vfs_inode;
};
struct shmem_sb_info {
unsigned long max_blocks;
struct percpu_counter used_blocks;
unsigned long max_inodes;
unsigned long free_inodes;
spinlock_t stat_lock;
uid_t uid;
gid_t gid;
umode_t mode;
struct mempolicy *mpol;
};
static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
{
return container_of(inode, struct shmem_inode_info, vfs_inode);
}
extern int shmem_init(void);
extern int shmem_fill_super(struct super_block *sb, void *data, int silent);
extern struct file *shmem_file_setup(const char *name,
loff_t size, unsigned long flags);
extern int shmem_zero_setup(struct vm_area_struct *);
extern int shmem_lock(struct file *file, int lock, struct user_struct *user);
extern void shmem_unlock_mapping(struct address_space *mapping);
extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
pgoff_t index, gfp_t gfp_mask);
extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
extern int shmem_unuse(swp_entry_t entry, struct page *page);
static inline struct page *shmem_read_mapping_page(
struct address_space *mapping, pgoff_t index)
{
return shmem_read_mapping_page_gfp(mapping, index,
mapping_gfp_mask(mapping));
}
#endif
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