root/include/linux/shmem_fs.h

INCLUDED FROM

DEFINITIONS

1. SHMEM_I
2. shmem_acl_init
3. shmem_acl_destroy_inode

#ifndef __SHMEM_FS_H
#define __SHMEM_FS_H

#include <linux/swap.h>
#include <linux/mempolicy.h>

/* inode in-kernel data */

#define SHMEM_NR_DIRECT 16

struct shmem_inode_info {
        spinlock_t              lock;
        unsigned long           flags;
        unsigned long           alloced;        /* data pages alloced to file */
        unsigned long           swapped;        /* subtotal assigned to swap */
        unsigned long           next_index;     /* highest alloced index + 1 */
        struct shared_policy    policy;         /* NUMA memory alloc policy */
        struct page             *i_indirect;    /* top indirect blocks page */
        swp_entry_t             i_direct[SHMEM_NR_DIRECT]; /* first blocks */
        struct list_head        swaplist;       /* chain of maybes on swap */
        struct inode            vfs_inode;
#ifdef CONFIG_TMPFS_POSIX_ACL
        struct posix_acl        *i_acl;
        struct posix_acl        *i_default_acl;
#endif
};

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;       /* Serialize shmem_sb_info changes */
        uid_t uid;                  /* Mount uid for root directory */
        gid_t gid;                  /* Mount gid for root directory */
        mode_t mode;                /* Mount mode for root directory */
        struct mempolicy *mpol;     /* default memory policy for mappings */
};

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

#ifdef CONFIG_TMPFS_POSIX_ACL
int shmem_permission(struct inode *, int);
int shmem_acl_init(struct inode *, struct inode *);
void shmem_acl_destroy_inode(struct inode *);

extern struct xattr_handler shmem_xattr_acl_access_handler;
extern struct xattr_handler shmem_xattr_acl_default_handler;

extern struct generic_acl_operations shmem_acl_ops;

#else
static inline int shmem_acl_init(struct inode *inode, struct inode *dir)
{
        return 0;
}
static inline void shmem_acl_destroy_inode(struct inode *inode)
{
}
#endif  /* CONFIG_TMPFS_POSIX_ACL */

#endif