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#ifndef __SHMEM_FS_H
#define __SHMEM_FS_H

#include <linux/swap.h>

/* inode in-kernel data */

#define SHMEM_NR_DIRECT 16

struct shmem_inode_info {
        spinlock_t              lock;
        unsigned long           next_index;
        swp_entry_t             i_direct[SHMEM_NR_DIRECT]; /* for the first blocks */
        struct page            *i_indirect; /* indirect blocks */
        unsigned long           alloced;    /* data pages allocated to file */
        unsigned long           swapped;    /* subtotal assigned to swap */
        unsigned long           flags;
        struct list_head        list;
        struct inode            vfs_inode;
};

struct shmem_sb_info {
        unsigned long max_blocks;   /* How many blocks are allowed */
        unsigned long free_blocks;  /* How many are left for allocation */
        unsigned long max_inodes;   /* How many inodes are allowed */
        unsigned long free_inodes;  /* How many are left for allocation */
        spinlock_t    stat_lock;
};

static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)
{
        return container_of(inode, struct shmem_inode_info, vfs_inode);
}

#endif